1 /*-------------------------------------------------------------------------* 2 * File: fs/jffs2/xattr.c 3 * XATTR support on JFFS2 FileSystem 4 * 5 * Implemented by KaiGai Kohei <kaigai@ak.jp.nec.com> 6 * Copyright (C) 2006 NEC Corporation 7 * 8 * For licensing information, see the file 'LICENCE' in the jffs2 directory. 9 *-------------------------------------------------------------------------*/ 10 11 #ifndef _JFFS2_FS_XATTR_H_ 12 #define _JFFS2_FS_XATTR_H_ 13 14 #include <linux/xattr.h> 15 16 #define JFFS2_XFLAGS_HOT (0x01) /* This datum is HOT */ 17 #define JFFS2_XFLAGS_BIND (0x02) /* This datum is not reclaimed */ 18 19 struct jffs2_xattr_datum 20 { 21 void *always_null; 22 u8 class; 23 u8 flags; 24 u16 xprefix; /* see JFFS2_XATTR_PREFIX_* */ 25 26 struct jffs2_raw_node_ref *node; 27 struct list_head xindex; /* chained from c->xattrindex[n] */ 28 uint32_t refcnt; /* # of xattr_ref refers this */ 29 uint32_t xid; 30 uint32_t version; 31 32 uint32_t data_crc; 33 uint32_t hashkey; 34 char *xname; /* XATTR name without prefix */ 35 uint32_t name_len; /* length of xname */ 36 char *xvalue; /* XATTR value */ 37 uint32_t value_len; /* length of xvalue */ 38 }; 39 40 struct jffs2_inode_cache; /* forward refence */ 41 struct jffs2_xattr_ref 42 { 43 void *always_null; 44 u8 class; 45 u8 flags; /* Currently unused */ 46 u16 unused; 47 48 struct jffs2_raw_node_ref *node; 49 union { 50 struct jffs2_inode_cache *ic; /* reference to jffs2_inode_cache */ 51 uint32_t ino; /* only used in scanning/building */ 52 }; 53 union { 54 struct jffs2_xattr_datum *xd; /* reference to jffs2_xattr_datum */ 55 uint32_t xid; /* only used in sccanning/building */ 56 }; 57 struct list_head ilist; /* chained from ic->ilist */ 58 }; 59 60 #ifdef CONFIG_JFFS2_FS_XATTR 61 62 extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c); 63 extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c); 64 extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c); 65 66 extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, 67 uint32_t xid, uint32_t version); 68 69 extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic); 70 extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic); 71 72 extern int jffs2_garbage_collect_xattr(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic); 73 extern int jffs2_verify_xattr(struct jffs2_sb_info *c); 74 75 extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, 76 char *buffer, size_t size); 77 extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, 78 const char *buffer, size_t size, int flags); 79 80 extern struct xattr_handler *jffs2_xattr_handlers[]; 81 extern struct xattr_handler jffs2_user_xattr_handler; 82 extern struct xattr_handler jffs2_trusted_xattr_handler; 83 84 extern ssize_t jffs2_listxattr(struct dentry *, char *, size_t); 85 #define jffs2_getxattr generic_getxattr 86 #define jffs2_setxattr generic_setxattr 87 #define jffs2_removexattr generic_removexattr 88 89 /*---- Any inline initialize functions ----*/ 90 #define init_xattr_inode_cache(x) INIT_LIST_HEAD(&((x)->ilist)) 91 92 #else 93 94 #define jffs2_init_xattr_subsystem(c) 95 #define jffs2_build_xattr_subsystem(c) 96 #define jffs2_clear_xattr_subsystem(c) 97 98 #define jffs2_xattr_delete_inode(c, ic) 99 #define jffs2_xattr_free_inode(c, ic) 100 #define jffs2_garbage_collect_xattr(c, ic) (1) 101 #define jffs2_verify_xattr(c) (1) 102 103 #define jffs2_xattr_handlers NULL 104 #define jffs2_listxattr NULL 105 #define jffs2_getxattr NULL 106 #define jffs2_setxattr NULL 107 #define jffs2_removexattr NULL 108 109 #define init_xattr_inode_cache(x) 110 111 #endif /* CONFIG_JFFS2_FS_XATTR */ 112 113 #ifdef CONFIG_JFFS2_FS_SECURITY 114 extern int jffs2_init_security(struct inode *inode, struct inode *dir); 115 extern struct xattr_handler jffs2_security_xattr_handler; 116 #else 117 #define jffs2_init_security(inode,dir) (0) 118 #endif /* CONFIG_JFFS2_FS_SECURITY */ 119 120 #endif /* _JFFS2_FS_XATTR_H_ */ 121