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 IS_ENABLED(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_RETURN_IF_CLOSED,
  32         NFS_DELEGATION_REFERENCED,
  33         NFS_DELEGATION_RETURNING,
  34 };
  35
  36 int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
  37 void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
  38 int nfs4_inode_return_delegation(struct inode *inode);
  39 int nfs_async_inode_return_delegation(struct inode *inode, 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_server_return_all_delegations(struct nfs_server *);
  44 void nfs_expire_all_delegations(struct nfs_client *clp);
  45 void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags);
  46 void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
  47 int nfs_client_return_marked_delegations(struct nfs_client *clp);
  48 int nfs_delegations_present(struct nfs_client *clp);
  49 void nfs_remove_bad_delegation(struct inode *inode);
  50
  51 void nfs_delegation_mark_reclaim(struct nfs_client *clp);
  52 void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
  53
  54 /* NFSv4 delegation-related procedures */
  55 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync);
  56 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
  57 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid);
  58 bool nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode, fmode_t flags);
  59
  60 void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
  61 int nfs4_have_delegation(struct inode *inode, fmode_t flags);
  62
  63 #endif
  64
  65 static inline int nfs_have_delegated_attributes(struct inode *inode)
  66 {
  67         return NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) &&
  68                 !(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED);
  69 }
  70
  71 #endif