1 | /* |
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2 | * JFFS2 -- Journalling Flash File System, Version 2. |
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3 | * |
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4 | * Copyright © 2006 NEC Corporation |
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5 | * |
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6 | * Created by KaiGai Kohei <kaigai@ak.jp.nec.com> |
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7 | * |
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8 | * For licensing information, see the file 'LICENCE' in this directory. |
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9 | * |
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10 | */ |
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11 | |
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12 | #ifndef _JFFS2_FS_XATTR_H_ |
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13 | #define _JFFS2_FS_XATTR_H_ |
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14 | |
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15 | #include <linux/xattr.h> |
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16 | #include <linux/list.h> |
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17 | |
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18 | #define JFFS2_XFLAGS_HOT (0x01) /* This datum is HOT */ |
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19 | #define JFFS2_XFLAGS_BIND (0x02) /* This datum is not reclaimed */ |
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20 | #define JFFS2_XFLAGS_DEAD (0x40) /* This datum is already dead */ |
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21 | #define JFFS2_XFLAGS_INVALID (0x80) /* This datum contains crc error */ |
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22 | |
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23 | struct jffs2_xattr_datum |
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24 | { |
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25 | void *always_null; |
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26 | struct jffs2_raw_node_ref *node; |
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27 | uint8_t class; |
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28 | uint8_t flags; |
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29 | uint16_t xprefix; /* see JFFS2_XATTR_PREFIX_* */ |
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30 | |
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31 | struct list_head xindex; /* chained from c->xattrindex[n] */ |
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32 | atomic_t refcnt; /* # of xattr_ref refers this */ |
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33 | uint32_t xid; |
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34 | uint32_t version; |
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35 | |
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36 | uint32_t data_crc; |
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37 | uint32_t hashkey; |
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38 | char *xname; /* XATTR name without prefix */ |
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39 | uint32_t name_len; /* length of xname */ |
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40 | char *xvalue; /* XATTR value */ |
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41 | uint32_t value_len; /* length of xvalue */ |
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42 | }; |
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43 | |
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44 | struct jffs2_inode_cache; |
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45 | struct jffs2_xattr_ref |
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46 | { |
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47 | void *always_null; |
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48 | struct jffs2_raw_node_ref *node; |
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49 | uint8_t class; |
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50 | uint8_t flags; /* Currently unused */ |
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51 | u16 unused; |
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52 | |
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53 | uint32_t xseqno; |
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54 | union { |
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55 | struct jffs2_inode_cache *ic; /* reference to jffs2_inode_cache */ |
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56 | uint32_t ino; /* only used in scanning/building */ |
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57 | }; |
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58 | union { |
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59 | struct jffs2_xattr_datum *xd; /* reference to jffs2_xattr_datum */ |
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60 | uint32_t xid; /* only used in sccanning/building */ |
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61 | }; |
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62 | struct jffs2_xattr_ref *next; /* chained from ic->xref_list */ |
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63 | }; |
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64 | |
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65 | #define XREF_DELETE_MARKER (0x00000001) |
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66 | static inline int is_xattr_ref_dead(struct jffs2_xattr_ref *ref) |
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67 | { |
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68 | return ((ref->xseqno & XREF_DELETE_MARKER) != 0); |
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69 | } |
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70 | |
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71 | #ifdef CONFIG_JFFS2_FS_XATTR |
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72 | |
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73 | extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c); |
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74 | extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c); |
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75 | extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c); |
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76 | |
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77 | extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, |
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78 | uint32_t xid, uint32_t version); |
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79 | |
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80 | extern void jffs2_xattr_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic); |
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81 | extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic); |
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82 | extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic); |
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83 | |
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84 | extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, |
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85 | struct jffs2_raw_node_ref *raw); |
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86 | extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, |
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87 | struct jffs2_raw_node_ref *raw); |
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88 | extern int jffs2_verify_xattr(struct jffs2_sb_info *c); |
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89 | extern void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd); |
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90 | extern void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref); |
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91 | |
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92 | extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, |
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93 | char *buffer, size_t size); |
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94 | extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, |
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95 | const char *buffer, size_t size, int flags); |
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96 | |
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97 | extern const struct xattr_handler *jffs2_xattr_handlers[]; |
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98 | extern const struct xattr_handler jffs2_user_xattr_handler; |
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99 | extern const struct xattr_handler jffs2_trusted_xattr_handler; |
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100 | |
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101 | extern ssize_t jffs2_listxattr(struct dentry *, char *, size_t); |
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102 | #define jffs2_getxattr generic_getxattr |
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103 | #define jffs2_setxattr generic_setxattr |
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104 | #define jffs2_removexattr generic_removexattr |
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105 | |
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106 | #else |
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107 | |
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108 | #define jffs2_init_xattr_subsystem(c) |
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109 | #define jffs2_build_xattr_subsystem(c) |
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110 | #define jffs2_clear_xattr_subsystem(c) |
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111 | |
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112 | #define jffs2_xattr_do_crccheck_inode(c, ic) |
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113 | #define jffs2_xattr_delete_inode(c, ic) |
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114 | #define jffs2_xattr_free_inode(c, ic) |
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115 | #define jffs2_verify_xattr(c) (1) |
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116 | |
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117 | #define jffs2_xattr_handlers NULL |
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118 | #define jffs2_listxattr NULL |
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119 | #define jffs2_getxattr NULL |
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120 | #define jffs2_setxattr NULL |
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121 | #define jffs2_removexattr NULL |
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122 | |
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123 | #endif /* CONFIG_JFFS2_FS_XATTR */ |
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124 | |
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125 | #ifdef CONFIG_JFFS2_FS_SECURITY |
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126 | extern int jffs2_init_security(struct inode *inode, struct inode *dir, |
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127 | const struct qstr *qstr); |
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128 | extern const struct xattr_handler jffs2_security_xattr_handler; |
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129 | #else |
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130 | #define jffs2_init_security(inode,dir,qstr) (0) |
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131 | #endif /* CONFIG_JFFS2_FS_SECURITY */ |
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132 | |
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133 | #endif /* _JFFS2_FS_XATTR_H_ */ |
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