fs/nfs/delegation.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * linux/fs/nfs/delegation.h
   4  *
   5  * Copyright (c) Trond Myklebust
   6  *
   7  * Definitions pertaining to NFS delegated files
   8  */
   9 #ifndef FS_NFS_DELEGATION_H
  10 #define FS_NFS_DELEGATION_H
  11
  12 #if IS_ENABLED(CONFIG_NFS_V4)
  13 /*
  14  * NFSv4 delegation
  15  */
  16 struct nfs_delegation {
  17         struct list_head super_list;
  18         const struct cred *cred;
  19         struct inode *inode;
  20         nfs4_stateid stateid;
  21         fmode_t type;
  22         unsigned long pagemod_limit;
  23         __u64 change_attr;
  24         unsigned long flags;
  25         refcount_t refcount;
  26         spinlock_t lock;
  27         struct rcu_head rcu;
  28 };
  29
  30 enum {
  31         NFS_DELEGATION_NEED_RECLAIM = 0,
  32         NFS_DELEGATION_RETURN,
  33         NFS_DELEGATION_RETURN_IF_CLOSED,
  34         NFS_DELEGATION_REFERENCED,
  35         NFS_DELEGATION_RETURNING,
  36         NFS_DELEGATION_REVOKED,
  37         NFS_DELEGATION_TEST_EXPIRED,
  38         NFS_DELEGATION_INODE_FREEING,
  39 };
  40
  41 int nfs_inode_set_delegation(struct inode *inode, const struct cred *cred,
  42                 fmode_t type, const nfs4_stateid *stateid, unsigned long pagemod_limit);
  43 void nfs_inode_reclaim_delegation(struct inode *inode, const struct cred *cred,
  44                 fmode_t type, const nfs4_stateid *stateid, unsigned long pagemod_limit);
  45 int nfs4_inode_return_delegation(struct inode *inode);
  46 void nfs4_inode_return_delegation_on_close(struct inode *inode);
  47 int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
  48 void nfs_inode_evict_delegation(struct inode *inode);
  49
  50 struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
  51 void nfs_server_return_all_delegations(struct nfs_server *);
  52 void nfs_expire_all_delegations(struct nfs_client *clp);
  53 void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags);
  54 void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
  55 int nfs_client_return_marked_delegations(struct nfs_client *clp);
  56 int nfs_delegations_present(struct nfs_client *clp);
  57 void nfs_remove_bad_delegation(struct inode *inode, const nfs4_stateid *stateid);
  58 void nfs_delegation_mark_returned(struct inode *inode, const nfs4_stateid *stateid);
  59
  60 void nfs_delegation_mark_reclaim(struct nfs_client *clp);
  61 void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
  62
  63 void nfs_mark_test_expired_all_delegations(struct nfs_client *clp);
  64 void nfs_test_expired_all_delegations(struct nfs_client *clp);
  65 void nfs_reap_expired_delegations(struct nfs_client *clp);
  66
  67 /* NFSv4 delegation-related procedures */
  68 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync);
  69 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
  70 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid);
  71 bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, nfs4_stateid *dst, const struct cred **cred);
  72 bool nfs4_refresh_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
  73
  74 struct nfs_delegation *nfs4_get_valid_delegation(const struct inode *inode);
  75 void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
  76 int nfs4_have_delegation(struct inode *inode, fmode_t flags);
  77 int nfs4_check_delegation(struct inode *inode, fmode_t flags);
  78 bool nfs4_delegation_flush_on_close(const struct inode *inode);
  79 void nfs_inode_find_delegation_state_and_recover(struct inode *inode,
  80                 const nfs4_stateid *stateid);
  81 int nfs4_inode_make_writeable(struct inode *inode);
  82
  83 #endif
  84
  85 static inline int nfs_have_delegated_attributes(struct inode *inode)
  86 {
  87         return NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) &&
  88                 !(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED);
  89 }
  90
  91 #endif