LXR linux/include/linux/reiserfs

   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
  13struct reiserfs_xattr_header {
  14        __le32 h_magic;         /* magic number for identification */
  15        __le32 h_hash;          /* hash of the value */
  16};
  17
  18struct reiserfs_security_handle {
  19        char *name;
  20        void *value;
  21        size_t length;
  22};
  23
  24#ifdef __KERNEL__
  25
  26#include <linux/init.h>
  27#include <linux/list.h>
  28#include <linux/rwsem.h>
  29#include <linux/reiserfs_fs_i.h>
  30#include <linux/reiserfs_fs.h>
  31
  32struct inode;
  33struct dentry;
  34struct iattr;
  35struct super_block;
  36struct nameidata;
  37
  38int reiserfs_xattr_register_handlers(void) __init;
  39void reiserfs_xattr_unregister_handlers(void);
  40int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
  41int reiserfs_lookup_privroot(struct super_block *sb);
  42int reiserfs_delete_xattrs(struct inode *inode);
  43int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
  44int reiserfs_permission(struct inode *inode, int mask);
  45
  46#ifdef CONFIG_REISERFS_FS_XATTR
  47#define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
  48ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name,
  49                          void *buffer, size_t size);
  50int reiserfs_setxattr(struct dentry *dentry, const char *name,
  51                      const void *value, size_t size, int flags);
  52ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
  53int reiserfs_removexattr(struct dentry *dentry, const char *name);
  54
  55int reiserfs_xattr_get(struct inode *, const char *, void *, size_t);
  56int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
  57int reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *,
  58                              struct inode *, const char *, const void *,
  59                              size_t, int);
  60
  61extern struct xattr_handler reiserfs_xattr_user_handler;
  62extern struct xattr_handler reiserfs_xattr_trusted_handler;
  63extern struct xattr_handler reiserfs_xattr_security_handler;
  64#ifdef CONFIG_REISERFS_FS_SECURITY
  65int reiserfs_security_init(struct inode *dir, struct inode *inode,
  66                           struct reiserfs_security_handle *sec);
  67int reiserfs_security_write(struct reiserfs_transaction_handle *th,
  68                            struct inode *inode,
  69                            struct reiserfs_security_handle *sec);
  70void reiserfs_security_free(struct reiserfs_security_handle *sec);
  71#endif
  72
  73#define xattr_size(size) ((size) + sizeof(struct reiserfs_xattr_header))
  74static inline loff_t reiserfs_xattr_nblocks(struct inode *inode, loff_t size)
  75{
  76        loff_t ret = 0;
  77        if (reiserfs_file_data_log(inode)) {
  78                ret = _ROUND_UP(xattr_size(size), inode->i_sb->s_blocksize);
  79                ret >>= inode->i_sb->s_blocksize_bits;
  80        }
  81        return ret;
  82}
  83
  84/* We may have to create up to 3 objects: xattr root, xattr dir, xattr file.
  85 * Let's try to be smart about it.
  86 * xattr root: We cache it. If it's not cached, we may need to create it.
  87 * xattr dir: If anything has been loaded for this inode, we can set a flag
  88 *            saying so.
  89 * xattr file: Since we don't cache xattrs, we can't tell. We always include
  90 *             blocks for it.
  91 *
  92 * However, since root and dir can be created between calls - YOU MUST SAVE
  93 * THIS VALUE.
  94 */
  95static inline size_t reiserfs_xattr_jcreate_nblocks(struct inode *inode)
  96{
  97        size_t nblocks = JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
  98
  99        if ((REISERFS_I(inode)->i_flags & i_has_xattr_dir) == 0) {
 100                nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
 101                if (!REISERFS_SB(inode->i_sb)->xattr_root->d_inode)
 102                        nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
 103        }
 104
 105        return nblocks;
 106}
 107
 108static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 109{
 110        init_rwsem(&REISERFS_I(inode)->i_xattr_sem);
 111}
 112
 113#else
 114
 115#define reiserfs_getxattr NULL
 116#define reiserfs_setxattr NULL
 117#define reiserfs_listxattr NULL
 118#define reiserfs_removexattr NULL
 119
 120static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 121{
 122}
 123#endif  /*  CONFIG_REISERFS_FS_XATTR  */
 124
 125#ifndef CONFIG_REISERFS_FS_SECURITY
 126static inline int reiserfs_security_init(struct inode *dir,
 127                                         struct inode *inode,
 128                                         struct reiserfs_security_handle *sec)
 129{
 130        return 0;
 131}
 132static inline int
 133reiserfs_security_write(struct reiserfs_transaction_handle *th,
 134                        struct inode *inode,
 135                        struct reiserfs_security_handle *sec)
 136{
 137        return 0;
 138}
 139static inline void reiserfs_security_free(struct reiserfs_security_handle *sec)
 140{}
 141#endif
 142
 143#endif  /*  __KERNEL__  */
 144
 145#endif  /*  _LINUX_REISERFS_XATTR_H  */
 146