LXR linux/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 */
  15struct 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        struct rcu_head rcu;
  26};
  27
  28int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
  29void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
  30int nfs_inode_return_delegation(struct inode *inode);
  31int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
  32
  33struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
  34void nfs_return_all_delegations(struct super_block *sb);
  35void nfs_expire_all_delegations(struct nfs_client *clp);
  36void nfs_handle_cb_pathdown(struct nfs_client *clp);
  37
  38void nfs_delegation_mark_reclaim(struct nfs_client *clp);
  39void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
  40
  41/* NFSv4 delegation-related procedures */
  42int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid);
  43int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
  44int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl);
  45int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
  46
  47static inline int nfs_have_delegation(struct inode *inode, int flags)
  48{
  49        struct nfs_delegation *delegation;
  50        int ret = 0;
  51
  52        flags &= FMODE_READ|FMODE_WRITE;
  53        rcu_read_lock();
  54        delegation = rcu_dereference(NFS_I(inode)->delegation);
  55        if (delegation != NULL && (delegation->type & flags) == flags)
  56                ret = 1;
  57        rcu_read_unlock();
  58        return ret;
  59}
  60
  61#else
  62static inline int nfs_have_delegation(struct inode *inode, int flags)
  63{
  64        return 0;
  65}
  66
  67static inline int nfs_inode_return_delegation(struct inode *inode)
  68{
  69        return 0;
  70}
  71#endif
  72
  73#endif
  74