fs/jffs2/xattr.h

   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
  23 struct 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
  44 struct jffs2_inode_cache;
  45 struct 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)
  66 static 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
  73 extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);
  74 extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
  75 extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c);
  76
  77 extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
  78                                                          uint32_t xid, uint32_t version);
  79
  80 extern void jffs2_xattr_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
  81 extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
  82 extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
  83
  84 extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
  85                                              struct jffs2_raw_node_ref *raw);
  86 extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
  87                                            struct jffs2_raw_node_ref *raw);
  88 extern int jffs2_verify_xattr(struct jffs2_sb_info *c);
  89 extern void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd);
  90 extern void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref);
  91
  92 extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
  93                              char *buffer, size_t size);
  94 extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
  95                              const char *buffer, size_t size, int flags);
  96
  97 extern const struct xattr_handler *jffs2_xattr_handlers[];
  98 extern const struct xattr_handler jffs2_user_xattr_handler;
  99 extern const struct xattr_handler jffs2_trusted_xattr_handler;
 100
 101 extern ssize_t jffs2_listxattr(struct dentry *, char *, size_t);
 102
 103 #else
 104
 105 #define jffs2_init_xattr_subsystem(c)
 106 #define jffs2_build_xattr_subsystem(c)
 107 #define jffs2_clear_xattr_subsystem(c)
 108
 109 #define jffs2_xattr_do_crccheck_inode(c, ic)
 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
 117 #endif /* CONFIG_JFFS2_FS_XATTR */
 118
 119 #ifdef CONFIG_JFFS2_FS_SECURITY
 120 extern int jffs2_init_security(struct inode *inode, struct inode *dir,
 121                                const struct qstr *qstr);
 122 extern const struct xattr_handler jffs2_security_xattr_handler;
 123 #else
 124 #define jffs2_init_security(inode,dir,qstr)     (0)
 125 #endif /* CONFIG_JFFS2_FS_SECURITY */
 126
 127 #endif /* _JFFS2_FS_XATTR_H_ */