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        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
  28enum {
  29        NFS_DELEGATION_NEED_RECLAIM = 0,
  30        NFS_DELEGATION_RETURN,
  31        NFS_DELEGATION_REFERENCED,
  32};
  33
  34int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
  35void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
  36int nfs_inode_return_delegation(struct inode *inode);
  37int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
  38void nfs_inode_return_delegation_noreclaim(struct inode *inode);
  39
  40struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
  41void nfs_super_return_all_delegations(struct super_block *sb);
  42void nfs_expire_all_delegations(struct nfs_client *clp);
  43void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags);
  44void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
  45void nfs_handle_cb_pathdown(struct nfs_client *clp);
  46int nfs_client_return_marked_delegations(struct nfs_client *clp);
  47int nfs_delegations_present(struct nfs_client *clp);
  48void nfs_remove_bad_delegation(struct inode *inode);
  49
  50void nfs_delegation_mark_reclaim(struct nfs_client *clp);
  51void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
  52
  53/* NFSv4 delegation-related procedures */
  54int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync);
  55int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
  56int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl);
  57int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
  58
  59void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
  60int nfs_have_delegation(struct inode *inode, fmode_t flags);
  61
  62#else
  63static inline int nfs_have_delegation(struct inode *inode, fmode_t flags)
  64{
  65        return 0;
  66}
  67
  68static inline int nfs_inode_return_delegation(struct inode *inode)
  69{
  70        return 0;
  71}
  72#endif
  73
  74static 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