dlm.h 2.4 KB

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  1. /******************************************************************************
  2. *******************************************************************************
  3. **
  4. ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
  5. ** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
  6. **
  7. ** This copyrighted material is made available to anyone wishing to use,
  8. ** modify, copy, or redistribute it subject to the terms and conditions
  9. ** of the GNU General Public License v.2.
  10. **
  11. *******************************************************************************
  12. ******************************************************************************/
  13. #ifndef __DLM_DOT_H__
  14. #define __DLM_DOT_H__
  15. /*
  16. * Interface to Distributed Lock Manager (DLM)
  17. * routines and structures to use DLM lockspaces
  18. */
  19. /* Lock levels and flags are here */
  20. #include <linux/dlmconstants.h>
  21. #include <linux/types.h>
  22. typedef void dlm_lockspace_t;
  23. /*
  24. * Lock status block
  25. *
  26. * Use this structure to specify the contents of the lock value block. For a
  27. * conversion request, this structure is used to specify the lock ID of the
  28. * lock. DLM writes the status of the lock request and the lock ID assigned
  29. * to the request in the lock status block.
  30. *
  31. * sb_lkid: the returned lock ID. It is set on new (non-conversion) requests.
  32. * It is available when dlm_lock returns.
  33. *
  34. * sb_lvbptr: saves or returns the contents of the lock's LVB according to rules
  35. * shown for the DLM_LKF_VALBLK flag.
  36. *
  37. * sb_flags: DLM_SBF_DEMOTED is returned if in the process of promoting a lock,
  38. * it was first demoted to NL to avoid conversion deadlock.
  39. * DLM_SBF_VALNOTVALID is returned if the resource's LVB is marked invalid.
  40. *
  41. * sb_status: the returned status of the lock request set prior to AST
  42. * execution. Possible return values:
  43. *
  44. * 0 if lock request was successful
  45. * -EAGAIN if request would block and is flagged DLM_LKF_NOQUEUE
  46. * -DLM_EUNLOCK if unlock request was successful
  47. * -DLM_ECANCEL if a cancel completed successfully
  48. * -EDEADLK if a deadlock was detected
  49. * -ETIMEDOUT if the lock request was canceled due to a timeout
  50. */
  51. #define DLM_SBF_DEMOTED 0x01
  52. #define DLM_SBF_VALNOTVALID 0x02
  53. #define DLM_SBF_ALTMODE 0x04
  54. struct dlm_lksb {
  55. int sb_status;
  56. __u32 sb_lkid;
  57. char sb_flags;
  58. char * sb_lvbptr;
  59. };
  60. /* dlm_new_lockspace() flags */
  61. #define DLM_LSFL_TIMEWARN 0x00000002
  62. #define DLM_LSFL_FS 0x00000004
  63. #define DLM_LSFL_NEWEXCL 0x00000008
  64. #endif /* __DLM_DOT_H__ */