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