linux/fs/jffs2/xattr.h
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   1/*
   2 * JFFS2 -- Journalling Flash File System, Version 2.
   3 *
   4 * Copyright © 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
  12#ifndef _JFFS2_FS_XATTR_H_
  13#define _JFFS2_FS_XATTR_H_
  14
  15#include <linux/xattr.h>
  16#include <linux/list.h>
  17
  18#define JFFS2_XFLAGS_HOT        (0x01)  /* This datum is HOT */
  19#define JFFS2_XFLAGS_BIND       (0x02)  /* This datum is not reclaimed */
  20#define JFFS2_XFLAGS_DEAD       (0x40)  /* This datum is already dead */
  21#define JFFS2_XFLAGS_INVALID    (0x80)  /* This datum contains crc error */
  22
  23struct jffs2_xattr_datum
  24{
  25        void *always_null;
  26        struct jffs2_raw_node_ref *node;
  27        uint8_t class;
  28        uint8_t flags;
  29        uint16_t xprefix;               /* see JFFS2_XATTR_PREFIX_* */
  30
  31        struct list_head xindex;        /* chained from c->xattrindex[n] */
  32        atomic_t refcnt;                /* # of xattr_ref refers this */
  33        uint32_t xid;
  34        uint32_t version;
  35
  36        uint32_t data_crc;
  37        uint32_t hashkey;
  38        char *xname;            /* XATTR name without prefix */
  39        uint32_t name_len;      /* length of xname */
  40        char *xvalue;           /* XATTR value */
  41        uint32_t value_len;     /* length of xvalue */
  42};
  43
  44struct jffs2_inode_cache;
  45struct jffs2_xattr_ref
  46{
  47        void *always_null;
  48        struct jffs2_raw_node_ref *node;
  49        uint8_t class;
  50        uint8_t flags;          /* Currently unused */
  51        u16 unused;
  52
  53        uint32_t xseqno;
  54        union {
  55                struct jffs2_inode_cache *ic;   /* reference to jffs2_inode_cache */
  56                uint32_t ino;                   /* only used in scanning/building  */
  57        };
  58        union {
  59                struct jffs2_xattr_datum *xd;   /* reference to jffs2_xattr_datum */
  60                uint32_t xid;                   /* only used in sccanning/building */
  61        };
  62        struct jffs2_xattr_ref *next;           /* chained from ic->xref_list */
  63};
  64
  65#define XREF_DELETE_MARKER      (0x00000001)
  66static inline int is_xattr_ref_dead(struct jffs2_xattr_ref *ref)
  67{
  68        return ((ref->xseqno & XREF_DELETE_MARKER) != 0);
  69}
  70
  71#ifdef CONFIG_JFFS2_FS_XATTR
  72
  73extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);
  74extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
  75extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c);
  76
  77extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
  78                                                         uint32_t xid, uint32_t version);
  79
  80extern void jffs2_xattr_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
  81extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
  82extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
  83
  84extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
  85                                             struct jffs2_raw_node_ref *raw);
  86extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
  87                                           struct jffs2_raw_node_ref *raw);
  88extern int jffs2_verify_xattr(struct jffs2_sb_info *c);
  89extern void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd);
  90extern void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref);
  91
  92extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
  93                             char *buffer, size_t size);
  94extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
  95                             const char *buffer, size_t size, int flags);
  96
  97extern const struct xattr_handler *jffs2_xattr_handlers[];
  98extern const struct xattr_handler jffs2_user_xattr_handler;
  99extern const struct xattr_handler jffs2_trusted_xattr_handler;
 100
 101extern ssize_t jffs2_listxattr(struct dentry *, char *, size_t);
 102#define jffs2_getxattr          generic_getxattr
 103#define jffs2_setxattr          generic_setxattr
 104#define jffs2_removexattr       generic_removexattr
 105
 106#else
 107
 108#define jffs2_init_xattr_subsystem(c)
 109#define jffs2_build_xattr_subsystem(c)
 110#define jffs2_clear_xattr_subsystem(c)
 111
 112#define jffs2_xattr_do_crccheck_inode(c, ic)
 113#define jffs2_xattr_delete_inode(c, ic)
 114#define jffs2_xattr_free_inode(c, ic)
 115#define jffs2_verify_xattr(c)                   (1)
 116
 117#define jffs2_xattr_handlers    NULL
 118#define jffs2_listxattr         NULL
 119#define jffs2_getxattr          NULL
 120#define jffs2_setxattr          NULL
 121#define jffs2_removexattr       NULL
 122
 123#endif /* CONFIG_JFFS2_FS_XATTR */
 124
 125#ifdef CONFIG_JFFS2_FS_SECURITY
 126extern int jffs2_init_security(struct inode *inode, struct inode *dir,
 127                               const struct qstr *qstr);
 128extern const struct xattr_handler jffs2_security_xattr_handler;
 129#else
 130#define jffs2_init_security(inode,dir,qstr)     (0)
 131#endif /* CONFIG_JFFS2_FS_SECURITY */
 132
 133#endif /* _JFFS2_FS_XATTR_H_ */
 134
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