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         int type;
  21 #define NFS_DELEGATION_NEED_RECLAIM 1
  22         long flags;
  23         loff_t maxsize;
  24         __u64 change_attr;
  25 };
  26
  27 int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
  28 void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
  29 int __nfs_inode_return_delegation(struct inode *inode);
  30 int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
  31
  32 struct inode *nfs_delegation_find_inode(struct nfs4_client *clp, const struct nfs_fh *fhandle);
  33 void nfs_return_all_delegations(struct super_block *sb);
  34 void nfs_expire_all_delegations(struct nfs4_client *clp);
  35 void nfs_handle_cb_pathdown(struct nfs4_client *clp);
  36
  37 void nfs_delegation_mark_reclaim(struct nfs4_client *clp);
  38 void nfs_delegation_reap_unclaimed(struct nfs4_client *clp);
  39
  40 /* NFSv4 delegation-related procedures */
  41 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid);
  42 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state);
  43 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl);
  44
  45 static inline int nfs_have_delegation(struct inode *inode, int flags)
  46 {
  47         flags &= FMODE_READ|FMODE_WRITE;
  48         smp_rmb();
  49         if ((NFS_I(inode)->delegation_state & flags) == flags)
  50                 return 1;
  51         return 0;
  52 }
  53
  54 static inline int nfs_inode_return_delegation(struct inode *inode)
  55 {
  56         int err = 0;
  57
  58         if (NFS_I(inode)->delegation != NULL)
  59                 err = __nfs_inode_return_delegation(inode);
  60         return err;
  61 }
  62 #else
  63 static inline int nfs_have_delegation(struct inode *inode, int 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 #endif