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 IS_ENABLED(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        unsigned long pagemod_limit;
  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_RETURN_IF_CLOSED,
  32        NFS_DELEGATION_REFERENCED,
  33        NFS_DELEGATION_RETURNING,
  34        NFS_DELEGATION_REVOKED,
  35        NFS_DELEGATION_TEST_EXPIRED,
  36};
  37
  38int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
  39void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
  40int nfs4_inode_return_delegation(struct inode *inode);
  41int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
  42void nfs_inode_return_delegation_noreclaim(struct inode *inode);
  43
  44struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
  45void nfs_server_return_all_delegations(struct nfs_server *);
  46void nfs_expire_all_delegations(struct nfs_client *clp);
  47void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags);
  48void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
  49int nfs_client_return_marked_delegations(struct nfs_client *clp);
  50int nfs_delegations_present(struct nfs_client *clp);
  51void nfs_remove_bad_delegation(struct inode *inode, const nfs4_stateid *stateid);
  52
  53void nfs_delegation_mark_reclaim(struct nfs_client *clp);
  54void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
  55
  56void nfs_mark_test_expired_all_delegations(struct nfs_client *clp);
  57void nfs_reap_expired_delegations(struct nfs_client *clp);
  58
  59/* NFSv4 delegation-related procedures */
  60int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync);
  61int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid, fmode_t type);
  62int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid);
  63bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, nfs4_stateid *dst, struct rpc_cred **cred);
  64
  65void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
  66int nfs4_have_delegation(struct inode *inode, fmode_t flags);
  67int nfs4_check_delegation(struct inode *inode, fmode_t flags);
  68bool nfs4_delegation_flush_on_close(const struct inode *inode);
  69void nfs_inode_find_delegation_state_and_recover(struct inode *inode,
  70                const nfs4_stateid *stateid);
  71
  72#endif
  73
  74static inline int nfs_have_delegated_attributes(struct inode *inode)
  75{
  76        return NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) &&
  77                !(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED);
  78}
  79
  80#endif
  81