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 14 #include <linux/xattr.h> 15 #include <linux/list.h> 16 17 #define JFFS2_XFLAGS_HOT (0x01) /* This datum is HOT */ 18 #define JFFS2_XFLAGS_BIND (0x02) /* This datum is not reclaimed */ 19 #define JFFS2_XFLAGS_INVALID (0x80) /* This datum contains crc error */ 20 21 struct jffs2_xattr_datum 22 { 23 void *always_null; 24 struct jffs2_raw_node_ref *node; 25 uint8_t class; 26 uint8_t flags; 27 uint16_t xprefix; /* see JFFS2_XATTR_PREFIX_* */ 28 29 struct list_head xindex; /* chained from c->xattrindex[n] */ 30 uint32_t refcnt; /* # of xattr_ref refers this */ 31 uint32_t xid; 32 uint32_t version; 33 34 uint32_t data_crc; 35 uint32_t hashkey; 36 char *xname; /* XATTR name without prefix */ 37 uint32_t name_len; /* length of xname */ 38 char *xvalue; /* XATTR value */ 39 uint32_t value_len; /* length of xvalue */ 40 }; 41 42 struct jffs2_inode_cache; 43 struct jffs2_xattr_ref 44 { 45 void *always_null; 46 struct jffs2_raw_node_ref *node; 47 uint8_t class; 48 uint8_t flags; /* Currently unused */ 49 u16 unused; 50 51 uint32_t xseqno; 52 union { 53 struct jffs2_inode_cache *ic; /* reference to jffs2_inode_cache */ 54 uint32_t ino; /* only used in scanning/building */ 55 }; 56 union { 57 struct jffs2_xattr_datum *xd; /* reference to jffs2_xattr_datum */ 58 uint32_t xid; /* only used in sccanning/building */ 59 }; 60 struct jffs2_xattr_ref *next; /* chained from ic->xref_list */ 61 }; 62 63 #define XDATUM_DELETE_MARKER (0xffffffff) 64 #define XREF_DELETE_MARKER (0x00000001) 65 static inline int is_xattr_datum_dead(struct jffs2_xattr_datum *xd) 66 { 67 return (xd->version == XDATUM_DELETE_MARKER); 68 } 69 70 static inline void set_xattr_datum_dead(struct jffs2_xattr_datum *xd) 71 { 72 xd->version = XDATUM_DELETE_MARKER; 73 } 74 75 static inline int is_xattr_ref_dead(struct jffs2_xattr_ref *ref) 76 { 77 return ((ref->xseqno & XREF_DELETE_MARKER) != 0); 78 } 79 80 static inline void set_xattr_ref_dead(struct jffs2_xattr_ref *ref) 81 { 82 ref->xseqno |= XREF_DELETE_MARKER; 83 } 84 85 static inline void clr_xattr_ref_dead(struct jffs2_xattr_ref *ref) 86 { 87 ref->xseqno &= ~XREF_DELETE_MARKER; 88 } 89 90 91 #ifdef CONFIG_JFFS2_FS_XATTR 92 93 extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c); 94 extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c); 95 extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c); 96 97 extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, 98 uint32_t xid, uint32_t version); 99 100 extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic); 101 extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic); 102 103 extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, 104 struct jffs2_raw_node_ref *raw); 105 extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, 106 struct jffs2_raw_node_ref *raw); 107 extern int jffs2_verify_xattr(struct jffs2_sb_info *c); 108 extern void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd); 109 extern void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref); 110 111 extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, 112 char *buffer, size_t size); 113 extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, 114 const char *buffer, size_t size, int flags); 115 116 extern struct xattr_handler *jffs2_xattr_handlers[]; 117 extern struct xattr_handler jffs2_user_xattr_handler; 118 extern struct xattr_handler jffs2_trusted_xattr_handler; 119 120 extern ssize_t jffs2_listxattr(struct dentry *, char *, size_t); 121 #define jffs2_getxattr generic_getxattr 122 #define jffs2_setxattr generic_setxattr 123 #define jffs2_removexattr generic_removexattr 124 125 #else 126 127 #define jffs2_init_xattr_subsystem(c) 128 #define jffs2_build_xattr_subsystem(c) 129 #define jffs2_clear_xattr_subsystem(c) 130 131 #define jffs2_xattr_delete_inode(c, ic) 132 #define jffs2_xattr_free_inode(c, ic) 133 #define jffs2_verify_xattr(c) (1) 134 135 #define jffs2_xattr_handlers NULL 136 #define jffs2_listxattr NULL 137 #define jffs2_getxattr NULL 138 #define jffs2_setxattr NULL 139 #define jffs2_removexattr NULL 140 141 #endif /* CONFIG_JFFS2_FS_XATTR */ 142 143 #ifdef CONFIG_JFFS2_FS_SECURITY 144 extern int jffs2_init_security(struct inode *inode, struct inode *dir); 145 extern struct xattr_handler jffs2_security_xattr_handler; 146 #else 147 #define jffs2_init_security(inode,dir) (0) 148 #endif /* CONFIG_JFFS2_FS_SECURITY */ 149 150 #endif /* _JFFS2_FS_XATTR_H_ */ 151