nfsfh.h 3.4 KB

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  1. /*
  2. * This file describes the layout of the file handles as passed
  3. * over the wire.
  4. *
  5. * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
  6. */
  7. #ifndef _LINUX_NFSD_FH_H
  8. #define _LINUX_NFSD_FH_H
  9. #include <linux/types.h>
  10. #include <linux/nfs.h>
  11. #include <linux/nfs2.h>
  12. #include <linux/nfs3.h>
  13. #include <linux/nfs4.h>
  14. /*
  15. * This is the old "dentry style" Linux NFSv2 file handle.
  16. *
  17. * The xino and xdev fields are currently used to transport the
  18. * ino/dev of the exported inode.
  19. */
  20. struct nfs_fhbase_old {
  21. __u32 fb_dcookie; /* dentry cookie - always 0xfeebbaca */
  22. __u32 fb_ino; /* our inode number */
  23. __u32 fb_dirino; /* dir inode number, 0 for directories */
  24. __u32 fb_dev; /* our device */
  25. __u32 fb_xdev;
  26. __u32 fb_xino;
  27. __u32 fb_generation;
  28. };
  29. /*
  30. * This is the new flexible, extensible style NFSv2/v3/v4 file handle.
  31. * by Neil Brown <neilb@cse.unsw.edu.au> - March 2000
  32. *
  33. * The file handle starts with a sequence of four-byte words.
  34. * The first word contains a version number (1) and three descriptor bytes
  35. * that tell how the remaining 3 variable length fields should be handled.
  36. * These three bytes are auth_type, fsid_type and fileid_type.
  37. *
  38. * All four-byte values are in host-byte-order.
  39. *
  40. * The auth_type field is deprecated and must be set to 0.
  41. *
  42. * The fsid_type identifies how the filesystem (or export point) is
  43. * encoded.
  44. * Current values:
  45. * 0 - 4 byte device id (ms-2-bytes major, ls-2-bytes minor), 4byte inode number
  46. * NOTE: we cannot use the kdev_t device id value, because kdev_t.h
  47. * says we mustn't. We must break it up and reassemble.
  48. * 1 - 4 byte user specified identifier
  49. * 2 - 4 byte major, 4 byte minor, 4 byte inode number - DEPRECATED
  50. * 3 - 4 byte device id, encoded for user-space, 4 byte inode number
  51. * 4 - 4 byte inode number and 4 byte uuid
  52. * 5 - 8 byte uuid
  53. * 6 - 16 byte uuid
  54. * 7 - 8 byte inode number and 16 byte uuid
  55. *
  56. * The fileid_type identified how the file within the filesystem is encoded.
  57. * The values for this field are filesystem specific, exccept that
  58. * filesystems must not use the values '0' or '0xff'. 'See enum fid_type'
  59. * in include/linux/exportfs.h for currently registered values.
  60. */
  61. struct nfs_fhbase_new {
  62. __u8 fb_version; /* == 1, even => nfs_fhbase_old */
  63. __u8 fb_auth_type;
  64. __u8 fb_fsid_type;
  65. __u8 fb_fileid_type;
  66. __u32 fb_auth[1];
  67. /* __u32 fb_fsid[0]; floating */
  68. /* __u32 fb_fileid[0]; floating */
  69. };
  70. struct knfsd_fh {
  71. unsigned int fh_size; /* significant for NFSv3.
  72. * Points to the current size while building
  73. * a new file handle
  74. */
  75. union {
  76. struct nfs_fhbase_old fh_old;
  77. __u32 fh_pad[NFS4_FHSIZE/4];
  78. struct nfs_fhbase_new fh_new;
  79. } fh_base;
  80. };
  81. #define ofh_dcookie fh_base.fh_old.fb_dcookie
  82. #define ofh_ino fh_base.fh_old.fb_ino
  83. #define ofh_dirino fh_base.fh_old.fb_dirino
  84. #define ofh_dev fh_base.fh_old.fb_dev
  85. #define ofh_xdev fh_base.fh_old.fb_xdev
  86. #define ofh_xino fh_base.fh_old.fb_xino
  87. #define ofh_generation fh_base.fh_old.fb_generation
  88. #define fh_version fh_base.fh_new.fb_version
  89. #define fh_fsid_type fh_base.fh_new.fb_fsid_type
  90. #define fh_auth_type fh_base.fh_new.fb_auth_type
  91. #define fh_fileid_type fh_base.fh_new.fb_fileid_type
  92. #define fh_fsid fh_base.fh_new.fb_auth
  93. /* Do not use, provided for userspace compatiblity. */
  94. #define fh_auth fh_base.fh_new.fb_auth
  95. #endif /* _LINUX_NFSD_FH_H */