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 struct 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
  32 struct inode;
  33 struct dentry;
  34 struct iattr;
  35 struct super_block;
  36 struct nameidata;
  37
  38 int reiserfs_xattr_register_handlers(void) __init;
  39 void reiserfs_xattr_unregister_handlers(void);
  40 int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
  41 int reiserfs_lookup_privroot(struct super_block *sb);
  42 int reiserfs_delete_xattrs(struct inode *inode);
  43 int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
  44 int 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)
  48 ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name,
  49                           void *buffer, size_t size);
  50 int reiserfs_setxattr(struct dentry *dentry, const char *name,
  51                       const void *value, size_t size, int flags);
  52 ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
  53 int reiserfs_removexattr(struct dentry *dentry, const char *name);
  54
  55 int reiserfs_xattr_get(struct inode *, const char *, void *, size_t);
  56 int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
  57 int reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *,
  58                               struct inode *, const char *, const void *,
  59                               size_t, int);
  60
  61 extern const struct xattr_handler reiserfs_xattr_user_handler;
  62 extern const struct xattr_handler reiserfs_xattr_trusted_handler;
  63 extern const struct xattr_handler reiserfs_xattr_security_handler;
  64 #ifdef CONFIG_REISERFS_FS_SECURITY
  65 int reiserfs_security_init(struct inode *dir, struct inode *inode,
  66                            struct reiserfs_security_handle *sec);
  67 int reiserfs_security_write(struct reiserfs_transaction_handle *th,
  68                             struct inode *inode,
  69                             struct reiserfs_security_handle *sec);
  70 void reiserfs_security_free(struct reiserfs_security_handle *sec);
  71 #endif
  72
  73 static inline int reiserfs_xattrs_initialized(struct super_block *sb)
  74 {
  75         return REISERFS_SB(sb)->priv_root != NULL;
  76 }
  77
  78 #define xattr_size(size) ((size) + sizeof(struct reiserfs_xattr_header))
  79 static inline loff_t reiserfs_xattr_nblocks(struct inode *inode, loff_t size)
  80 {
  81         loff_t ret = 0;
  82         if (reiserfs_file_data_log(inode)) {
  83                 ret = _ROUND_UP(xattr_size(size), inode->i_sb->s_blocksize);
  84                 ret >>= inode->i_sb->s_blocksize_bits;
  85         }
  86         return ret;
  87 }
  88
  89 /* We may have to create up to 3 objects: xattr root, xattr dir, xattr file.
  90  * Let's try to be smart about it.
  91  * xattr root: We cache it. If it's not cached, we may need to create it.
  92  * xattr dir: If anything has been loaded for this inode, we can set a flag
  93  *            saying so.
  94  * xattr file: Since we don't cache xattrs, we can't tell. We always include
  95  *             blocks for it.
  96  *
  97  * However, since root and dir can be created between calls - YOU MUST SAVE
  98  * THIS VALUE.
  99  */
 100 static inline size_t reiserfs_xattr_jcreate_nblocks(struct inode *inode)
 101 {
 102         size_t nblocks = JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
 103
 104         if ((REISERFS_I(inode)->i_flags & i_has_xattr_dir) == 0) {
 105                 nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
 106                 if (!REISERFS_SB(inode->i_sb)->xattr_root->d_inode)
 107                         nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
 108         }
 109
 110         return nblocks;
 111 }
 112
 113 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 114 {
 115         init_rwsem(&REISERFS_I(inode)->i_xattr_sem);
 116 }
 117
 118 #else
 119
 120 #define reiserfs_getxattr NULL
 121 #define reiserfs_setxattr NULL
 122 #define reiserfs_listxattr NULL
 123 #define reiserfs_removexattr NULL
 124
 125 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 126 {
 127 }
 128 #endif  /*  CONFIG_REISERFS_FS_XATTR  */
 129
 130 #ifndef CONFIG_REISERFS_FS_SECURITY
 131 static inline int reiserfs_security_init(struct inode *dir,
 132                                          struct inode *inode,
 133                                          struct reiserfs_security_handle *sec)
 134 {
 135         return 0;
 136 }
 137 static inline int
 138 reiserfs_security_write(struct reiserfs_transaction_handle *th,
 139                         struct inode *inode,
 140                         struct reiserfs_security_handle *sec)
 141 {
 142         return 0;
 143 }
 144 static inline void reiserfs_security_free(struct reiserfs_security_handle *sec)
 145 {}
 146 #endif
 147
 148 #endif  /*  __KERNEL__  */
 149
 150 #endif  /*  _LINUX_REISERFS_XATTR_H  */