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_DEAD (0x40) /* This datum is already dead */ 20 #define JFFS2_XFLAGS_INVALID (0x80) /* This datum contains crc error */ 21 22 struct jffs2_xattr_datum 23 { 24 void *always_null; 25 struct jffs2_raw_node_ref *node; 26 uint8_t class; 27 uint8_t flags; 28 uint16_t xprefix; /* see JFFS2_XATTR_PREFIX_* */ 29 30 struct list_head xindex; /* chained from c->xattrindex[n] */ 31 uint32_t refcnt; /* # of xattr_ref refers this */ 32 uint32_t xid; 33 uint32_t version; 34 35 uint32_t data_crc; 36 uint32_t hashkey; 37 char *xname; /* XATTR name without prefix */ 38 uint32_t name_len; /* length of xname */ 39 char *xvalue; /* XATTR value */ 40 uint32_t value_len; /* length of xvalue */ 41 }; 42 43 struct jffs2_inode_cache; 44 struct jffs2_xattr_ref 45 { 46 void *always_null; 47 struct jffs2_raw_node_ref *node; 48 uint8_t class; 49 uint8_t flags; /* Currently unused */ 50 u16 unused; 51 52 uint32_t xseqno; 53 union { 54 struct jffs2_inode_cache *ic; /* reference to jffs2_inode_cache */ 55 uint32_t ino; /* only used in scanning/building */ 56 }; 57 union { 58 struct jffs2_xattr_datum *xd; /* reference to jffs2_xattr_datum */ 59 uint32_t xid; /* only used in sccanning/building */ 60 }; 61 struct jffs2_xattr_ref *next; /* chained from ic->xref_list */ 62 }; 63 64 #define XREF_DELETE_MARKER (0x00000001) 65 static inline int is_xattr_ref_dead(struct jffs2_xattr_ref *ref) 66 { 67 return ((ref->xseqno & XREF_DELETE_MARKER) != 0); 68 } 69 70 #ifdef CONFIG_JFFS2_FS_XATTR 71 72 extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c); 73 extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c); 74 extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c); 75 76 extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, 77 uint32_t xid, uint32_t version); 78 79 extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic); 80 extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic); 81 82 extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, 83 struct jffs2_raw_node_ref *raw); 84 extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, 85 struct jffs2_raw_node_ref *raw); 86 extern int jffs2_verify_xattr(struct jffs2_sb_info *c); 87 extern void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd); 88 extern void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref); 89 90 extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, 91 char *buffer, size_t size); 92 extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, 93 const char *buffer, size_t size, int flags); 94 95 extern struct xattr_handler *jffs2_xattr_handlers[]; 96 extern struct xattr_handler jffs2_user_xattr_handler; 97 extern struct xattr_handler jffs2_trusted_xattr_handler; 98 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 103 104 #else 105 106 #define jffs2_init_xattr_subsystem(c) 107 #define jffs2_build_xattr_subsystem(c) 108 #define jffs2_clear_xattr_subsystem(c) 109 110 #define jffs2_xattr_delete_inode(c, ic) 111 #define jffs2_xattr_free_inode(c, ic) 112 #define jffs2_verify_xattr(c) (1) 113 114 #define jffs2_xattr_handlers NULL 115 #define jffs2_listxattr NULL 116 #define jffs2_getxattr NULL 117 #define jffs2_setxattr NULL 118 #define jffs2_removexattr NULL 119 120 #endif /* CONFIG_JFFS2_FS_XATTR */ 121 122 #ifdef CONFIG_JFFS2_FS_SECURITY 123 extern int jffs2_init_security(struct inode *inode, struct inode *dir); 124 extern struct xattr_handler jffs2_security_xattr_handler; 125 #else 126 #define jffs2_init_security(inode,dir) (0) 127 #endif /* CONFIG_JFFS2_FS_SECURITY */ 128 129 #endif /* _JFFS2_FS_XATTR_H_ */ 130