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