xattr.h 4.6 KB

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  1. /*
  2. * JFFS2 -- Journalling Flash File System, Version 2.
  3. *
  4. * Copyright (C) 2006 NEC Corporation
  5. *
  6. * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
  7. *
  8. * For licensing information, see the file 'LICENCE' in this directory.
  9. *
  10. */
  11. #ifndef _JFFS2_FS_XATTR_H_
  12. #define _JFFS2_FS_XATTR_H_
  13. #include <linux/xattr.h>
  14. #include <linux/list.h>
  15. #define JFFS2_XFLAGS_HOT (0x01) /* This datum is HOT */
  16. #define JFFS2_XFLAGS_BIND (0x02) /* This datum is not reclaimed */
  17. #define JFFS2_XFLAGS_INVALID (0x80) /* This datum contains crc error */
  18. struct jffs2_xattr_datum
  19. {
  20. void *always_null;
  21. struct jffs2_raw_node_ref *node;
  22. uint8_t class;
  23. uint8_t flags;
  24. uint16_t xprefix; /* see JFFS2_XATTR_PREFIX_* */
  25. struct list_head xindex; /* chained from c->xattrindex[n] */
  26. uint32_t refcnt; /* # of xattr_ref refers this */
  27. uint32_t xid;
  28. uint32_t version;
  29. uint32_t data_crc;
  30. uint32_t hashkey;
  31. char *xname; /* XATTR name without prefix */
  32. uint32_t name_len; /* length of xname */
  33. char *xvalue; /* XATTR value */
  34. uint32_t value_len; /* length of xvalue */
  35. };
  36. struct jffs2_inode_cache;
  37. struct jffs2_xattr_ref
  38. {
  39. void *always_null;
  40. struct jffs2_raw_node_ref *node;
  41. uint8_t class;
  42. uint8_t flags; /* Currently unused */
  43. u16 unused;
  44. uint32_t xseqno;
  45. union {
  46. struct jffs2_inode_cache *ic; /* reference to jffs2_inode_cache */
  47. uint32_t ino; /* only used in scanning/building */
  48. };
  49. union {
  50. struct jffs2_xattr_datum *xd; /* reference to jffs2_xattr_datum */
  51. uint32_t xid; /* only used in sccanning/building */
  52. };
  53. struct jffs2_xattr_ref *next; /* chained from ic->xref_list */
  54. };
  55. #define XDATUM_DELETE_MARKER (0xffffffff)
  56. #define XREF_DELETE_MARKER (0x00000001)
  57. static inline int is_xattr_datum_dead(struct jffs2_xattr_datum *xd)
  58. {
  59. return (xd->version == XDATUM_DELETE_MARKER);
  60. }
  61. static inline void set_xattr_datum_dead(struct jffs2_xattr_datum *xd)
  62. {
  63. xd->version = XDATUM_DELETE_MARKER;
  64. }
  65. static inline int is_xattr_ref_dead(struct jffs2_xattr_ref *ref)
  66. {
  67. return ((ref->xseqno & XREF_DELETE_MARKER) != 0);
  68. }
  69. static inline void set_xattr_ref_dead(struct jffs2_xattr_ref *ref)
  70. {
  71. ref->xseqno |= XREF_DELETE_MARKER;
  72. }
  73. static inline void clr_xattr_ref_dead(struct jffs2_xattr_ref *ref)
  74. {
  75. ref->xseqno &= ~XREF_DELETE_MARKER;
  76. }
  77. #ifdef CONFIG_JFFS2_FS_XATTR
  78. extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);
  79. extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
  80. extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c);
  81. extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
  82. uint32_t xid, uint32_t version);
  83. extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
  84. extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
  85. extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
  86. struct jffs2_raw_node_ref *raw);
  87. extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
  88. struct jffs2_raw_node_ref *raw);
  89. extern int jffs2_verify_xattr(struct jffs2_sb_info *c);
  90. extern void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd);
  91. extern void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref);
  92. extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
  93. char *buffer, size_t size);
  94. extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
  95. const char *buffer, size_t size, int flags);
  96. extern struct xattr_handler *jffs2_xattr_handlers[];
  97. extern struct xattr_handler jffs2_user_xattr_handler;
  98. extern struct xattr_handler jffs2_trusted_xattr_handler;
  99. extern ssize_t jffs2_listxattr(struct dentry *, char *, size_t);
  100. #define jffs2_getxattr generic_getxattr
  101. #define jffs2_setxattr generic_setxattr
  102. #define jffs2_removexattr generic_removexattr
  103. #else
  104. #define jffs2_init_xattr_subsystem(c)
  105. #define jffs2_build_xattr_subsystem(c)
  106. #define jffs2_clear_xattr_subsystem(c)
  107. #define jffs2_xattr_delete_inode(c, ic)
  108. #define jffs2_xattr_free_inode(c, ic)
  109. #define jffs2_verify_xattr(c) (1)
  110. #define jffs2_xattr_handlers NULL
  111. #define jffs2_listxattr NULL
  112. #define jffs2_getxattr NULL
  113. #define jffs2_setxattr NULL
  114. #define jffs2_removexattr NULL
  115. #endif /* CONFIG_JFFS2_FS_XATTR */
  116. #ifdef CONFIG_JFFS2_FS_SECURITY
  117. extern int jffs2_init_security(struct inode *inode, struct inode *dir);
  118. extern struct xattr_handler jffs2_security_xattr_handler;
  119. #else
  120. #define jffs2_init_security(inode,dir) (0)
  121. #endif /* CONFIG_JFFS2_FS_SECURITY */
  122. #endif /* _JFFS2_FS_XATTR_H_ */