/*
   * JFFS2 -- Journalling Flash File System, Version 2.

   *

   * Copyright © 2006  NEC Corporation

   *

   * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
   *
   * For licensing information, see the file 'LICENCE' in this directory.
   *
   */

  #ifndef _JFFS2_FS_XATTR_H_
  #define _JFFS2_FS_XATTR_H_
  
  #include <linux/xattr.h>

  #include <linux/list.h>

  
  #define JFFS2_XFLAGS_HOT	(0x01)	/* This datum is HOT */
  #define JFFS2_XFLAGS_BIND	(0x02)	/* This datum is not reclaimed */

  #define JFFS2_XFLAGS_DEAD	(0x40)	/* This datum is already dead */

  #define JFFS2_XFLAGS_INVALID	(0x80)	/* This datum contains crc error */

  
  struct jffs2_xattr_datum
  {
  	void *always_null;

  	struct jffs2_raw_node_ref *node;

  	uint8_t class;
  	uint8_t flags;

  	uint16_t xprefix;		/* see JFFS2_XATTR_PREFIX_* */

  	struct list_head xindex;	/* chained from c->xattrindex[n] */

  	atomic_t refcnt;		/* # of xattr_ref refers this */

  	uint32_t xid;
  	uint32_t version;
  
  	uint32_t data_crc;
  	uint32_t hashkey;
  	char *xname;		/* XATTR name without prefix */
  	uint32_t name_len;	/* length of xname */
  	char *xvalue;		/* XATTR value */
  	uint32_t value_len;	/* length of xvalue */
  };

  struct jffs2_inode_cache;

  struct jffs2_xattr_ref
  {
  	void *always_null;

  	struct jffs2_raw_node_ref *node;
  	uint8_t class;
  	uint8_t flags;		/* Currently unused */

  	u16 unused;

  	uint32_t xseqno;

  	union {
  		struct jffs2_inode_cache *ic;	/* reference to jffs2_inode_cache */
  		uint32_t ino;			/* only used in scanning/building  */
  	};
  	union {
  		struct jffs2_xattr_datum *xd;	/* reference to jffs2_xattr_datum */
  		uint32_t xid;			/* only used in sccanning/building */
  	};

  	struct jffs2_xattr_ref *next;		/* chained from ic->xref_list */

  };

  #define XREF_DELETE_MARKER	(0x00000001)

  static inline int is_xattr_ref_dead(struct jffs2_xattr_ref *ref)
  {
  	return ((ref->xseqno & XREF_DELETE_MARKER) != 0);
  }

  #ifdef CONFIG_JFFS2_FS_XATTR
  
  extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);
  extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
  extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c);
  
  extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,

  							 uint32_t xid, uint32_t version);

  
  extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
  extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);

  extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
  					     struct jffs2_raw_node_ref *raw);
  extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
  					   struct jffs2_raw_node_ref *raw);

  extern int jffs2_verify_xattr(struct jffs2_sb_info *c);

  extern void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd);
  extern void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref);

  
  extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
  			     char *buffer, size_t size);
  extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
  			     const char *buffer, size_t size, int flags);

  extern const struct xattr_handler *jffs2_xattr_handlers[];
  extern const struct xattr_handler jffs2_user_xattr_handler;
  extern const struct xattr_handler jffs2_trusted_xattr_handler;

  
  extern ssize_t jffs2_listxattr(struct dentry *, char *, size_t);
  #define jffs2_getxattr		generic_getxattr
  #define jffs2_setxattr		generic_setxattr
  #define jffs2_removexattr	generic_removexattr

  #else
  
  #define jffs2_init_xattr_subsystem(c)
  #define jffs2_build_xattr_subsystem(c)
  #define jffs2_clear_xattr_subsystem(c)
  
  #define jffs2_xattr_delete_inode(c, ic)
  #define jffs2_xattr_free_inode(c, ic)

  #define jffs2_verify_xattr(c)			(1)
  
  #define jffs2_xattr_handlers	NULL
  #define jffs2_listxattr		NULL
  #define jffs2_getxattr		NULL
  #define jffs2_setxattr		NULL
  #define jffs2_removexattr	NULL

  #endif /* CONFIG_JFFS2_FS_XATTR */
  
  #ifdef CONFIG_JFFS2_FS_SECURITY

  extern int jffs2_init_security(struct inode *inode, struct inode *dir,
  			       const struct qstr *qstr);

  extern const struct xattr_handler jffs2_security_xattr_handler;

  #else

  #define jffs2_init_security(inode,dir,qstr)	(0)

  #endif /* CONFIG_JFFS2_FS_SECURITY */
  
  #endif /* _JFFS2_FS_XATTR_H_ */