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);

    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  */