delegation.h 3.6 KB

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  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. #if IS_ENABLED(CONFIG_NFS_V4)
  12. /*
  13. * NFSv4 delegation
  14. */
  15. struct nfs_delegation {
  16. struct list_head super_list;
  17. const struct 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. refcount_t refcount;
  25. spinlock_t lock;
  26. struct rcu_head rcu;
  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. NFS_DELEGATION_INODE_FREEING,
  37. NFS_DELEGATION_RETURN_DELAYED,
  38. };
  39. int nfs_inode_set_delegation(struct inode *inode, const struct cred *cred,
  40. fmode_t type, const nfs4_stateid *stateid, unsigned long pagemod_limit);
  41. void nfs_inode_reclaim_delegation(struct inode *inode, const struct cred *cred,
  42. fmode_t type, const nfs4_stateid *stateid, unsigned long pagemod_limit);
  43. int nfs4_inode_return_delegation(struct inode *inode);
  44. void nfs4_inode_return_delegation_on_close(struct inode *inode);
  45. int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
  46. void nfs_inode_evict_delegation(struct inode *inode);
  47. struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
  48. void nfs_server_return_all_delegations(struct nfs_server *);
  49. void nfs_expire_all_delegations(struct nfs_client *clp);
  50. void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags);
  51. void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
  52. int nfs_client_return_marked_delegations(struct nfs_client *clp);
  53. int nfs_delegations_present(struct nfs_client *clp);
  54. void nfs_remove_bad_delegation(struct inode *inode, const nfs4_stateid *stateid);
  55. void nfs_delegation_mark_returned(struct inode *inode, const nfs4_stateid *stateid);
  56. void nfs_delegation_mark_reclaim(struct nfs_client *clp);
  57. void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
  58. void nfs_mark_test_expired_all_delegations(struct nfs_client *clp);
  59. void nfs_test_expired_all_delegations(struct nfs_client *clp);
  60. void nfs_reap_expired_delegations(struct nfs_client *clp);
  61. /* NFSv4 delegation-related procedures */
  62. int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync);
  63. int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
  64. int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid);
  65. bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, nfs4_stateid *dst, const struct cred **cred);
  66. bool nfs4_refresh_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
  67. struct nfs_delegation *nfs4_get_valid_delegation(const struct inode *inode);
  68. void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
  69. int nfs4_have_delegation(struct inode *inode, fmode_t flags);
  70. int nfs4_check_delegation(struct inode *inode, fmode_t flags);
  71. bool nfs4_delegation_flush_on_close(const struct inode *inode);
  72. void nfs_inode_find_delegation_state_and_recover(struct inode *inode,
  73. const nfs4_stateid *stateid);
  74. int nfs4_inode_make_writeable(struct inode *inode);
  75. #endif
  76. static inline int nfs_have_delegated_attributes(struct inode *inode)
  77. {
  78. return NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) &&
  79. !(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED);
  80. }
  81. #endif