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 test_gen;
  25         unsigned long flags;
  26         refcount_t refcount;
  27         spinlock_t lock;
  28         struct rcu_head rcu;
  29 };
  30
  31 enum {
  32         NFS_DELEGATION_NEED_RECLAIM = 0,
  33         NFS_DELEGATION_RETURN,
  34         NFS_DELEGATION_RETURN_IF_CLOSED,
  35         NFS_DELEGATION_REFERENCED,
  36         NFS_DELEGATION_RETURNING,
  37         NFS_DELEGATION_REVOKED,
  38         NFS_DELEGATION_TEST_EXPIRED,
  39         NFS_DELEGATION_INODE_FREEING,
  40         NFS_DELEGATION_RETURN_DELAYED,
  41         NFS_DELEGATION_DELEGTIME,
  42 };
  43
  44 int nfs_inode_set_delegation(struct inode *inode, const struct cred *cred,
  45                              fmode_t type, const nfs4_stateid *stateid,
  46                              unsigned long pagemod_limit, u32 deleg_type);
  47 void nfs_inode_reclaim_delegation(struct inode *inode, const struct cred *cred,
  48                                   fmode_t type, const nfs4_stateid *stateid,
  49                                   unsigned long pagemod_limit, u32 deleg_type);
  50 int nfs4_inode_return_delegation(struct inode *inode);
  51 void nfs4_inode_return_delegation_on_close(struct inode *inode);
  52 int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
  53 void nfs_inode_evict_delegation(struct inode *inode);
  54
  55 struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
  56 void nfs_server_return_all_delegations(struct nfs_server *);
  57 void nfs_expire_all_delegations(struct nfs_client *clp);
  58 void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags);
  59 void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
  60 int nfs_client_return_marked_delegations(struct nfs_client *clp);
  61 int nfs_delegations_present(struct nfs_client *clp);
  62 void nfs_remove_bad_delegation(struct inode *inode, const nfs4_stateid *stateid);
  63 void nfs_delegation_mark_returned(struct inode *inode, const nfs4_stateid *stateid);
  64
  65 void nfs_delegation_mark_reclaim(struct nfs_client *clp);
  66 void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
  67
  68 void nfs_mark_test_expired_all_delegations(struct nfs_client *clp);
  69 void nfs_test_expired_all_delegations(struct nfs_client *clp);
  70 void nfs_reap_expired_delegations(struct nfs_client *clp);
  71
  72 /* NFSv4 delegation-related procedures */
  73 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred,
  74                           const nfs4_stateid *stateid,
  75                           struct nfs_delegation *delegation, int issync);
  76 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
  77 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid);
  78 bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, nfs4_stateid *dst, const struct cred **cred);
  79 bool nfs4_refresh_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
  80
  81 struct nfs_delegation *nfs4_get_valid_delegation(const struct inode *inode);
  82 void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
  83 int nfs4_have_delegation(struct inode *inode, fmode_t type, int flags);
  84 int nfs4_check_delegation(struct inode *inode, fmode_t type);
  85 bool nfs4_delegation_flush_on_close(const struct inode *inode);
  86 void nfs_inode_find_delegation_state_and_recover(struct inode *inode,
  87                 const nfs4_stateid *stateid);
  88 int nfs4_inode_make_writeable(struct inode *inode);
  89
  90 #endif
  91
  92 #define NFS_DELEGATION_FLAG_TIME        BIT(1)
  93
  94 void nfs_update_delegated_atime(struct inode *inode);
  95 void nfs_update_delegated_mtime(struct inode *inode);
  96 void nfs_update_delegated_mtime_locked(struct inode *inode);
  97
  98 static inline int nfs_have_read_or_write_delegation(struct inode *inode)
  99 {
 100         return NFS_PROTO(inode)->have_delegation(inode, FMODE_READ, 0);
 101 }
 102
 103 static inline int nfs_have_write_delegation(struct inode *inode)
 104 {
 105         return NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE, 0);
 106 }
 107
 108 static inline int nfs_have_delegated_attributes(struct inode *inode)
 109 {
 110         return NFS_PROTO(inode)->have_delegation(inode, FMODE_READ, 0);
 111 }
 112
 113 static inline int nfs_have_delegated_atime(struct inode *inode)
 114 {
 115         return NFS_PROTO(inode)->have_delegation(inode, FMODE_READ,
 116                                                  NFS_DELEGATION_FLAG_TIME);
 117 }
 118
 119 static inline int nfs_have_delegated_mtime(struct inode *inode)
 120 {
 121         return NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE,
 122                                                  NFS_DELEGATION_FLAG_TIME);
 123 }
 124
 125 #endif