include/linux/reiserfs_xattr.h

   1 /*
   2   File: linux/reiserfs_xattr.h
   3 */
   4
   5 #ifndef _LINUX_REISERFS_XATTR_H
   6 #define _LINUX_REISERFS_XATTR_H
   7
   8 #include <linux/types.h>
   9
  10 /* Magic value in header */
  11 #define REISERFS_XATTR_MAGIC 0x52465841 /* "RFXA" */
  12
  13 struct reiserfs_xattr_header {
  14         __le32 h_magic;         /* magic number for identification */
  15         __le32 h_hash;          /* hash of the value */
  16 };
  17
  18 #ifdef __KERNEL__
  19
  20 #include <linux/init.h>
  21 #include <linux/list.h>
  22 #include <linux/rwsem.h>
  23 #include <linux/reiserfs_fs_i.h>
  24 #include <linux/reiserfs_fs.h>
  25
  26 struct inode;
  27 struct dentry;
  28 struct iattr;
  29 struct super_block;
  30 struct nameidata;
  31
  32 struct reiserfs_xattr_handler {
  33         char *prefix;
  34         int (*init) (void);
  35         void (*exit) (void);
  36         int (*get) (struct inode * inode, const char *name, void *buffer,
  37                     size_t size);
  38         int (*set) (struct inode * inode, const char *name, const void *buffer,
  39                     size_t size, int flags);
  40         int (*del) (struct inode * inode, const char *name);
  41         int (*list) (struct inode * inode, const char *name, int namelen,
  42                      char *out);
  43         struct list_head handlers;
  44 };
  45
  46 #ifdef CONFIG_REISERFS_FS_XATTR
  47 #define is_reiserfs_priv_object(inode) IS_PRIVATE(inode)
  48 #define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
  49 ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name,
  50                           void *buffer, size_t size);
  51 int reiserfs_setxattr(struct dentry *dentry, const char *name,
  52                       const void *value, size_t size, int flags);
  53 ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
  54 int reiserfs_removexattr(struct dentry *dentry, const char *name);
  55 int reiserfs_delete_xattrs(struct inode *inode);
  56 int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
  57 int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
  58 int reiserfs_permission(struct inode *inode, int mask, struct nameidata *nd);
  59
  60 int reiserfs_xattr_del(struct inode *, const char *);
  61 int reiserfs_xattr_get(const struct inode *, const char *, void *, size_t);
  62 int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
  63
  64 extern struct reiserfs_xattr_handler user_handler;
  65 extern struct reiserfs_xattr_handler trusted_handler;
  66 extern struct reiserfs_xattr_handler security_handler;
  67
  68 int reiserfs_xattr_register_handlers(void) __init;
  69 void reiserfs_xattr_unregister_handlers(void);
  70
  71 static inline void reiserfs_write_lock_xattrs(struct super_block *sb)
  72 {
  73         down_write(&REISERFS_XATTR_DIR_SEM(sb));
  74 }
  75 static inline void reiserfs_write_unlock_xattrs(struct super_block *sb)
  76 {
  77         up_write(&REISERFS_XATTR_DIR_SEM(sb));
  78 }
  79 static inline void reiserfs_read_lock_xattrs(struct super_block *sb)
  80 {
  81         down_read(&REISERFS_XATTR_DIR_SEM(sb));
  82 }
  83
  84 static inline void reiserfs_read_unlock_xattrs(struct super_block *sb)
  85 {
  86         up_read(&REISERFS_XATTR_DIR_SEM(sb));
  87 }
  88
  89 static inline void reiserfs_write_lock_xattr_i(struct inode *inode)
  90 {
  91         down_write(&REISERFS_I(inode)->xattr_sem);
  92 }
  93 static inline void reiserfs_write_unlock_xattr_i(struct inode *inode)
  94 {
  95         up_write(&REISERFS_I(inode)->xattr_sem);
  96 }
  97 static inline void reiserfs_read_lock_xattr_i(struct inode *inode)
  98 {
  99         down_read(&REISERFS_I(inode)->xattr_sem);
 100 }
 101
 102 static inline void reiserfs_read_unlock_xattr_i(struct inode *inode)
 103 {
 104         up_read(&REISERFS_I(inode)->xattr_sem);
 105 }
 106
 107 static inline void reiserfs_mark_inode_private(struct inode *inode)
 108 {
 109         inode->i_flags |= S_PRIVATE;
 110 }
 111
 112 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 113 {
 114         init_rwsem(&REISERFS_I(inode)->xattr_sem);
 115 }
 116
 117 #else
 118
 119 #define is_reiserfs_priv_object(inode) 0
 120 #define reiserfs_mark_inode_private(inode) do {;} while(0)
 121 #define reiserfs_getxattr NULL
 122 #define reiserfs_setxattr NULL
 123 #define reiserfs_listxattr NULL
 124 #define reiserfs_removexattr NULL
 125 #define reiserfs_write_lock_xattrs(sb) do {;} while(0)
 126 #define reiserfs_write_unlock_xattrs(sb) do {;} while(0)
 127 #define reiserfs_read_lock_xattrs(sb)
 128 #define reiserfs_read_unlock_xattrs(sb)
 129
 130 #define reiserfs_permission NULL
 131
 132 #define reiserfs_xattr_register_handlers() 0
 133 #define reiserfs_xattr_unregister_handlers()
 134
 135 static inline int reiserfs_delete_xattrs(struct inode *inode)
 136 {
 137         return 0;
 138 };
 139 static inline int reiserfs_chown_xattrs(struct inode *inode,
 140                                         struct iattr *attrs)
 141 {
 142         return 0;
 143 };
 144 static inline int reiserfs_xattr_init(struct super_block *sb, int mount_flags)
 145 {
 146         sb->s_flags = (sb->s_flags & ~MS_POSIXACL);     /* to be sure */
 147         return 0;
 148 };
 149 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 150 {
 151 }
 152 #endif  /*  CONFIG_REISERFS_FS_XATTR  */
 153
 154 #endif  /*  __KERNEL__  */
 155
 156 #endif  /*  _LINUX_REISERFS_XATTR_H  */