delegation.h 2.1 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. int type;
  20. #define NFS_DELEGATION_NEED_RECLAIM 1
  21. long flags;
  22. loff_t maxsize;
  23. __u64 change_attr;
  24. };
  25. int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
  26. void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
  27. int __nfs_inode_return_delegation(struct inode *inode);
  28. int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
  29. struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
  30. void nfs_return_all_delegations(struct super_block *sb);
  31. void nfs_expire_all_delegations(struct nfs_client *clp);
  32. void nfs_handle_cb_pathdown(struct nfs_client *clp);
  33. void nfs_delegation_mark_reclaim(struct nfs_client *clp);
  34. void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
  35. /* NFSv4 delegation-related procedures */
  36. int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid);
  37. int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state);
  38. int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl);
  39. int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
  40. static inline int nfs_have_delegation(struct inode *inode, int flags)
  41. {
  42. flags &= FMODE_READ|FMODE_WRITE;
  43. smp_rmb();
  44. if ((NFS_I(inode)->delegation_state & flags) == flags)
  45. return 1;
  46. return 0;
  47. }
  48. static inline int nfs_inode_return_delegation(struct inode *inode)
  49. {
  50. int err = 0;
  51. if (NFS_I(inode)->delegation != NULL)
  52. err = __nfs_inode_return_delegation(inode);
  53. return err;
  54. }
  55. #else
  56. static inline int nfs_have_delegation(struct inode *inode, int flags)
  57. {
  58. return 0;
  59. }
  60. static inline int nfs_inode_return_delegation(struct inode *inode)
  61. {
  62. return 0;
  63. }
  64. #endif
  65. #endif