delegation.h 2.6 KB

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  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. #if defined(CONFIG_NFS_V4)
  11. /*
  12. * NFSv4 delegation
  13. */
  14. struct nfs_delegation {
  15. struct list_head super_list;
  16. struct rpc_cred *cred;
  17. struct inode *inode;
  18. nfs4_stateid stateid;
  19. fmode_t type;
  20. loff_t maxsize;
  21. __u64 change_attr;
  22. unsigned long flags;
  23. spinlock_t lock;
  24. struct rcu_head rcu;
  25. };
  26. enum {
  27. NFS_DELEGATION_NEED_RECLAIM = 0,
  28. NFS_DELEGATION_RETURN,
  29. NFS_DELEGATION_REFERENCED,
  30. };
  31. int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
  32. void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
  33. int nfs_inode_return_delegation(struct inode *inode);
  34. int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
  35. void nfs_inode_return_delegation_noreclaim(struct inode *inode);
  36. struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
  37. void nfs_super_return_all_delegations(struct super_block *sb);
  38. void nfs_expire_all_delegations(struct nfs_client *clp);
  39. void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags);
  40. void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
  41. void nfs_handle_cb_pathdown(struct nfs_client *clp);
  42. int nfs_client_return_marked_delegations(struct nfs_client *clp);
  43. int nfs_delegations_present(struct nfs_client *clp);
  44. void nfs_remove_bad_delegation(struct inode *inode);
  45. void nfs_delegation_mark_reclaim(struct nfs_client *clp);
  46. void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
  47. /* NFSv4 delegation-related procedures */
  48. int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync);
  49. int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
  50. int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl);
  51. int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
  52. void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
  53. int nfs_have_delegation(struct inode *inode, fmode_t flags);
  54. #else
  55. static inline int nfs_have_delegation(struct inode *inode, fmode_t flags)
  56. {
  57. return 0;
  58. }
  59. static inline int nfs_inode_return_delegation(struct inode *inode)
  60. {
  61. return 0;
  62. }
  63. #endif
  64. static inline int nfs_have_delegated_attributes(struct inode *inode)
  65. {
  66. return nfs_have_delegation(inode, FMODE_READ) &&
  67. !(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED);
  68. }
  69. #endif