1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright © 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 12 #ifndef _JFFS2_FS_XATTR_H_ 13 #define _JFFS2_FS_XATTR_H_ 14 15 #include <linux/xattr.h> 16 #include <linux/list.h> 17 18 #define JFFS2_XFLAGS_HOT (0x01) /* This datum is HOT */ 19 #define JFFS2_XFLAGS_BIND (0x02) /* This datum is not reclaimed */ 20 #define JFFS2_XFLAGS_DEAD (0x40) /* This datum is already dead */ 21 #define JFFS2_XFLAGS_INVALID (0x80) /* This datum contains crc error */ 22 23 struct jffs2_xattr_datum 24 { 25 void *always_null; 26 struct jffs2_raw_node_ref *node; 27 uint8_t class; 28 uint8_t flags; 29 uint16_t xprefix; /* see JFFS2_XATTR_PREFIX_* */ 30 31 struct list_head xindex; /* chained from c->xattrindex[n] */ 32 atomic_t refcnt; /* # of xattr_ref refers this */ 33 uint32_t xid; 34 uint32_t version; 35 36 uint32_t data_crc; 37 uint32_t hashkey; 38 char *xname; /* XATTR name without prefix */ 39 uint32_t name_len; /* length of xname */ 40 char *xvalue; /* XATTR value */ 41 uint32_t value_len; /* length of xvalue */ 42 }; 43 44 struct jffs2_inode_cache; 45 struct jffs2_xattr_ref 46 { 47 void *always_null; 48 struct jffs2_raw_node_ref *node; 49 uint8_t class; 50 uint8_t flags; /* Currently unused */ 51 u16 unused; 52 53 uint32_t xseqno; 54 union { 55 struct jffs2_inode_cache *ic; /* reference to jffs2_inode_cache */ 56 uint32_t ino; /* only used in scanning/building */ 57 }; 58 union { 59 struct jffs2_xattr_datum *xd; /* reference to jffs2_xattr_datum */ 60 uint32_t xid; /* only used in sccanning/building */ 61 }; 62 struct jffs2_xattr_ref *next; /* chained from ic->xref_list */ 63 }; 64 65 #define XREF_DELETE_MARKER (0x00000001) 66 static inline int is_xattr_ref_dead(struct jffs2_xattr_ref *ref) 67 { 68 return ((ref->xseqno & XREF_DELETE_MARKER) != 0); 69 } 70 71 #ifdef CONFIG_JFFS2_FS_XATTR 72 73 extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c); 74 extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c); 75 extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c); 76 77 extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, 78 uint32_t xid, uint32_t version); 79 80 extern void jffs2_xattr_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic); 81 extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic); 82 extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic); 83 84 extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, 85 struct jffs2_raw_node_ref *raw); 86 extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, 87 struct jffs2_raw_node_ref *raw); 88 extern int jffs2_verify_xattr(struct jffs2_sb_info *c); 89 extern void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd); 90 extern void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref); 91 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 97 extern const struct xattr_handler *jffs2_xattr_handlers[]; 98 extern const struct xattr_handler jffs2_user_xattr_handler; 99 extern const struct xattr_handler jffs2_trusted_xattr_handler; 100 101 extern ssize_t jffs2_listxattr(struct dentry *, char *, size_t); 102 #define jffs2_getxattr generic_getxattr 103 #define jffs2_setxattr generic_setxattr 104 #define jffs2_removexattr generic_removexattr 105 106 #else 107 108 #define jffs2_init_xattr_subsystem(c) 109 #define jffs2_build_xattr_subsystem(c) 110 #define jffs2_clear_xattr_subsystem(c) 111 112 #define jffs2_xattr_do_crccheck_inode(c, ic) 113 #define jffs2_xattr_delete_inode(c, ic) 114 #define jffs2_xattr_free_inode(c, ic) 115 #define jffs2_verify_xattr(c) (1) 116 117 #define jffs2_xattr_handlers NULL 118 #define jffs2_listxattr NULL 119 #define jffs2_getxattr NULL 120 #define jffs2_setxattr NULL 121 #define jffs2_removexattr NULL 122 123 #endif /* CONFIG_JFFS2_FS_XATTR */ 124 125 #ifdef CONFIG_JFFS2_FS_SECURITY 126 extern int jffs2_init_security(struct inode *inode, struct inode *dir, 127 const struct qstr *qstr); 128 extern const struct xattr_handler jffs2_security_xattr_handler; 129 #else 130 #define jffs2_init_security(inode,dir,qstr) (0) 131 #endif /* CONFIG_JFFS2_FS_SECURITY */ 132 133 #endif /* _JFFS2_FS_XATTR_H_ */ 134