| KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame^] | 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_ */ |