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 #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         atomic_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_ */