fs/jffs2/xattr.h

   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
  20 struct jffs2_xattr_datum
  21 {
  22         void *always_null;
  23         u8 class;
  24         u8 flags;
  25         u16 xprefix;                    /* see JFFS2_XATTR_PREFIX_* */
  26
  27         struct jffs2_raw_node_ref *node;
  28         struct list_head xindex;        /* chained from c->xattrindex[n] */
  29         uint32_t refcnt;                /* # of xattr_ref refers this */
  30         uint32_t xid;
  31         uint32_t version;
  32
  33         uint32_t data_crc;
  34         uint32_t hashkey;
  35         char *xname;            /* XATTR name without prefix */
  36         uint32_t name_len;      /* length of xname */
  37         char *xvalue;           /* XATTR value */
  38         uint32_t value_len;     /* length of xvalue */
  39 };
  40
  41 struct jffs2_inode_cache;
  42 struct jffs2_xattr_ref
  43 {
  44         void *always_null;
  45         u8 class;
  46         u8 flags;               /* Currently unused */
  47         u16 unused;
  48
  49         struct jffs2_raw_node_ref *node;
  50         union {
  51                 struct jffs2_inode_cache *ic;   /* reference to jffs2_inode_cache */
  52                 uint32_t ino;                   /* only used in scanning/building  */
  53         };
  54         union {
  55                 struct jffs2_xattr_datum *xd;   /* reference to jffs2_xattr_datum */
  56                 uint32_t xid;                   /* only used in sccanning/building */
  57         };
  58         struct jffs2_xattr_ref *next;           /* chained from ic->xref_list */
  59 };
  60
  61 #ifdef CONFIG_JFFS2_FS_XATTR
  62
  63 extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);
  64 extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
  65 extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c);
  66
  67 extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
  68                                                   uint32_t xid, uint32_t version);
  69
  70 extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
  71 extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
  72
  73 extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd);
  74 extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref);
  75 extern int jffs2_verify_xattr(struct jffs2_sb_info *c);
  76
  77 extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
  78                              char *buffer, size_t size);
  79 extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
  80                              const char *buffer, size_t size, int flags);
  81
  82 extern struct xattr_handler *jffs2_xattr_handlers[];
  83 extern struct xattr_handler jffs2_user_xattr_handler;
  84 extern struct xattr_handler jffs2_trusted_xattr_handler;
  85
  86 extern ssize_t jffs2_listxattr(struct dentry *, char *, size_t);
  87 #define jffs2_getxattr          generic_getxattr
  88 #define jffs2_setxattr          generic_setxattr
  89 #define jffs2_removexattr       generic_removexattr
  90
  91 #else
  92
  93 #define jffs2_init_xattr_subsystem(c)
  94 #define jffs2_build_xattr_subsystem(c)
  95 #define jffs2_clear_xattr_subsystem(c)
  96
  97 #define jffs2_xattr_delete_inode(c, ic)
  98 #define jffs2_xattr_free_inode(c, ic)
  99 #define jffs2_verify_xattr(c)                   (1)
 100
 101 #define jffs2_xattr_handlers    NULL
 102 #define jffs2_listxattr         NULL
 103 #define jffs2_getxattr          NULL
 104 #define jffs2_setxattr          NULL
 105 #define jffs2_removexattr       NULL
 106
 107 #endif /* CONFIG_JFFS2_FS_XATTR */
 108
 109 #ifdef CONFIG_JFFS2_FS_SECURITY
 110 extern int jffs2_init_security(struct inode *inode, struct inode *dir);
 111 extern struct xattr_handler jffs2_security_xattr_handler;
 112 #else
 113 #define jffs2_init_security(inode,dir)  (0)
 114 #endif /* CONFIG_JFFS2_FS_SECURITY */
 115
 116 #endif /* _JFFS2_FS_XATTR_H_ */