[PATCH] reiserfs: xattr support

From: Chris Mason <mason@suse.com>

From: jeffm@suse.com

reiserfs support for xattrs

fs/Kconfig

@@ -244,6 +244,16 @@ config REISERFS_PROC_INFO
 	  Almost everyone but ReiserFS developers and people fine-tuning
 	  reiserfs or tracing problems should say N.
 
+config REISERFS_FS_XATTR
+	bool "ReiserFS extended attributes"
+	depends on REISERFS_FS
+	help
+	  Extended attributes are name:value pairs associated with inodes by
+	  the kernel or by users (see the attr(5) manual page, or visit
+	  <http://acl.bestbits.at/> for details).
+
+	  If unsure, say N.
+
 config JFS_FS
 	tristate "JFS filesystem support"
 	select NLS

fs/reiserfs/Makefile

@@ -9,6 +9,10 @@ reiserfs-objs := bitmap.o do_balan.o namei.o inode.o file.o dir.o fix_node.o \
 		 hashes.o tail_conversion.o journal.o resize.o \
 		 item_ops.o ioctl.o procfs.o
 
+ifeq ($(CONFIG_REISERFS_FS_XATTR),y)
+reiserfs-objs += xattr.o xattr_user.o
+endif
+
 # gcc -O2 (the kernel default)  is overaggressive on ppc32 when many inline
 # functions are used.  This causes the compiler to advance the stack
 # pointer out of the available stack space, corrupting kernel space,

fs/reiserfs/dir.c

@@ -115,6 +115,17 @@ static int reiserfs_readdir (struct file * filp, void * dirent, filldir_t filldi
 		    /* too big to send back to VFS */
 		    continue ;
 		}
+
+                /* Ignore the .reiserfs_priv entry */
+                if (reiserfs_xattrs (inode->i_sb) &&
+                    !old_format_only(inode->i_sb) &&
+                    filp->f_dentry == inode->i_sb->s_root &&
+                    REISERFS_SB(inode->i_sb)->priv_root &&
+                    REISERFS_SB(inode->i_sb)->priv_root->d_inode &&
+                    deh_objectid(deh) == le32_to_cpu (INODE_PKEY(REISERFS_SB(inode->i_sb)->priv_root->d_inode)->k_objectid)) {
+                  continue;
+                }
+
 		d_off = deh_offset (deh);
 		filp->f_pos = d_off ;
 		d_ino = deh_objectid (deh);

fs/reiserfs/file.c

@@ -5,6 +5,7 @@
 
 #include <linux/time.h>
 #include <linux/reiserfs_fs.h>
+#include <linux/reiserfs_xattr.h>
 #include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 #include <linux/pagemap.h>
@@ -97,51 +98,6 @@ static int reiserfs_sync_file(
   return ( n_err < 0 ) ? -EIO : 0;
 }
 
-static int reiserfs_setattr(struct dentry *dentry, struct iattr *attr) {
-    struct inode *inode = dentry->d_inode ;
-    int error ;
-    reiserfs_write_lock(inode->i_sb);
-    if (attr->ia_valid & ATTR_SIZE) {
-	/* version 2 items will be caught by the s_maxbytes check
-	** done for us in vmtruncate
-	*/
-	if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 &&
-	    attr->ia_size > MAX_NON_LFS) {
-	    error = -EFBIG ;
-	    goto out;
-	}
-	/* fill in hole pointers in the expanding truncate case. */
-        if (attr->ia_size > inode->i_size) {
-	    error = generic_cont_expand(inode, attr->ia_size) ;
-	    if (REISERFS_I(inode)->i_prealloc_count > 0) {
-		struct reiserfs_transaction_handle th ;
-		/* we're changing at most 2 bitmaps, inode + super */
-		journal_begin(&th, inode->i_sb, 4) ;
-		reiserfs_discard_prealloc (&th, inode);
-		journal_end(&th, inode->i_sb, 4) ;
-	    }
-	    if (error)
-	        goto out;
-	}
-    }
-
-    if ((((attr->ia_valid & ATTR_UID) && (attr->ia_uid & ~0xffff)) ||
-	 ((attr->ia_valid & ATTR_GID) && (attr->ia_gid & ~0xffff))) &&
-	(get_inode_sd_version (inode) == STAT_DATA_V1)) {
-		/* stat data of format v3.5 has 16 bit uid and gid */
-	    error = -EINVAL;
-	    goto out;	
-	}
-
-    error = inode_change_ok(inode, attr) ;
-    if (!error)
-        inode_setattr(inode, attr) ;
-
-out:
-    reiserfs_write_unlock(inode->i_sb);
-    return error ;
-}
-
 /* I really do not want to play with memory shortage right now, so
    to simplify the code, we are not going to write more than this much pages at
    a time. This still should considerably improve performance compared to 4k
@@ -1321,6 +1277,11 @@ struct file_operations reiserfs_file_operations = {
 struct  inode_operations reiserfs_file_inode_operations = {
     .truncate	= reiserfs_vfs_truncate_file,
     .setattr    = reiserfs_setattr,
+    .setxattr   = reiserfs_setxattr,
+    .getxattr   = reiserfs_getxattr,
+    .listxattr  = reiserfs_listxattr,
+    .removexattr = reiserfs_removexattr,
+    .permission = reiserfs_permission,
 };
 
 

fs/reiserfs/inode.c

@@ -5,6 +5,7 @@
 #include <linux/config.h>
 #include <linux/time.h>
 #include <linux/reiserfs_fs.h>
+#include <linux/reiserfs_xattr.h>
 #include <linux/smp_lock.h>
 #include <linux/pagemap.h>
 #include <linux/highmem.h>
@@ -13,6 +14,7 @@
 #include <linux/buffer_head.h>
 #include <linux/mpage.h>
 #include <linux/writeback.h>
+#include <linux/quotaops.h>
 
 extern int reiserfs_default_io_size; /* default io size devuned in super.c */
 
@@ -40,6 +42,8 @@ void reiserfs_delete_inode (struct inode * inode)
     if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */
 	down (&inode->i_sem); 
 
+	reiserfs_delete_xattrs (inode);
+
 	journal_begin(&th, inode->i_sb, jbegin_count) ;
 	reiserfs_update_inode_transaction(inode) ;
 
@@ -1053,10 +1057,11 @@ static void init_inode (struct inode * inode, struct path * path)
 	inode->i_op = &reiserfs_dir_inode_operations;
 	inode->i_fop = &reiserfs_dir_operations;
     } else if (S_ISLNK (inode->i_mode)) {
-	inode->i_op = &page_symlink_inode_operations;
+	inode->i_op = &reiserfs_symlink_inode_operations;
 	inode->i_mapping->a_ops = &reiserfs_address_space_operations;
     } else {
 	inode->i_blocks = 0;
+	inode->i_op = &reiserfs_special_inode_operations;
 	init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
     }
 }
@@ -2509,6 +2514,64 @@ static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb,
 }
 
 
+int reiserfs_setattr(struct dentry *dentry, struct iattr *attr) {
+    struct inode *inode = dentry->d_inode ;
+    int error ;
+    unsigned int ia_valid = attr->ia_valid;
+    reiserfs_write_lock(inode->i_sb);
+    if (attr->ia_valid & ATTR_SIZE) {
+	/* version 2 items will be caught by the s_maxbytes check
+	** done for us in vmtruncate
+	*/
+	if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 &&
+	    attr->ia_size > MAX_NON_LFS) {
+	    error = -EFBIG ;
+	    goto out;
+	}
+	/* fill in hole pointers in the expanding truncate case. */
+        if (attr->ia_size > inode->i_size) {
+	    error = generic_cont_expand(inode, attr->ia_size) ;
+	    if (REISERFS_I(inode)->i_prealloc_count > 0) {
+		struct reiserfs_transaction_handle th ;
+		/* we're changing at most 2 bitmaps, inode + super */
+		journal_begin(&th, inode->i_sb, 4) ;
+		reiserfs_discard_prealloc (&th, inode);
+		journal_end(&th, inode->i_sb, 4) ;
+	    }
+	    if (error)
+	        goto out;
+	}
+    }
+
+    if ((((attr->ia_valid & ATTR_UID) && (attr->ia_uid & ~0xffff)) ||
+	 ((attr->ia_valid & ATTR_GID) && (attr->ia_gid & ~0xffff))) &&
+	(get_inode_sd_version (inode) == STAT_DATA_V1)) {
+		/* stat data of format v3.5 has 16 bit uid and gid */
+	    error = -EINVAL;
+	    goto out;
+	}
+
+    error = inode_change_ok(inode, attr) ;
+    if (!error) {
+	if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
+	    (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
+                error = reiserfs_chown_xattrs (inode, attr);
+
+                if (!error)
+                    error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
+        }
+        if (!error)
+            inode_setattr(inode, attr) ;
+    }
+
+
+out:
+    reiserfs_write_unlock(inode->i_sb);
+    return error ;
+}
+
+
+
 struct address_space_operations reiserfs_address_space_operations = {
     .writepage = reiserfs_writepage,
     .readpage = reiserfs_readpage, 

fs/reiserfs/namei.c

@@ -15,6 +15,7 @@
 #include <linux/time.h>
 #include <linux/bitops.h>
 #include <linux/reiserfs_fs.h>
+#include <linux/reiserfs_xattr.h>
 #include <linux/smp_lock.h>
 
 #define INC_DIR_INODE_NLINK(i) if (i->i_nlink != 1) { i->i_nlink++; if (i->i_nlink >= REISERFS_LINK_MAX) i->i_nlink=1; }
@@ -331,11 +332,24 @@ static struct dentry * reiserfs_lookup (struct inode * dir, struct dentry * dent
     retval = reiserfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &path_to_entry, &de);
     pathrelse (&path_to_entry);
     if (retval == NAME_FOUND) {
+        /* Hide the .reiserfs_priv directory */
+	if (reiserfs_xattrs (dir->i_sb) &&
+	    !old_format_only(dir->i_sb) &&
+            REISERFS_SB(dir->i_sb)->priv_root &&
+            REISERFS_SB(dir->i_sb)->priv_root->d_inode &&
+	    de.de_objectid == le32_to_cpu (INODE_PKEY(REISERFS_SB(dir->i_sb)->priv_root->d_inode)->k_objectid)) {
+	  return ERR_PTR (-EACCES);
+	}
+
 	inode = reiserfs_iget (dir->i_sb, (struct cpu_key *)&(de.de_dir_id));
 	if (!inode || IS_ERR(inode)) {
 	    reiserfs_write_unlock(dir->i_sb);
 	    return ERR_PTR(-EACCES);
         }
+
+	/* Propogate the priv_object flag so we know we're in the priv tree */
+	if (is_reiserfs_priv_object (dir))
+	    REISERFS_I(inode)->i_flags |= i_priv_object;
     }
     reiserfs_write_unlock(dir->i_sb);
     if ( retval == IO_ERROR ) {
@@ -630,6 +644,7 @@ static int reiserfs_mknod (struct inode * dir, struct dentry *dentry, int mode,
         goto out_failed;
     }
 
+    inode->i_op = &reiserfs_special_inode_operations;
     init_special_inode(inode, inode->i_mode, rdev) ;
 
     //FIXME: needed for block and char devices only
@@ -942,7 +957,7 @@ static int reiserfs_symlink (struct inode * parent_dir,
     reiserfs_update_inode_transaction(inode) ;
     reiserfs_update_inode_transaction(parent_dir) ;
 
-    inode->i_op = &page_symlink_inode_operations;
+    inode->i_op = &reiserfs_symlink_inode_operations;
     inode->i_mapping->a_ops = &reiserfs_address_space_operations;
 
     // must be sure this inode is written with this transaction
@@ -1318,5 +1333,42 @@ struct inode_operations reiserfs_dir_inode_operations = {
     .rmdir	= reiserfs_rmdir,
     .mknod	= reiserfs_mknod,
     .rename	= reiserfs_rename,
+    .setattr    = reiserfs_setattr,
+    .setxattr   = reiserfs_setxattr,
+    .getxattr   = reiserfs_getxattr,
+    .listxattr  = reiserfs_listxattr,
+    .removexattr = reiserfs_removexattr,
+    .permission     = reiserfs_permission,
+};
+
+/*
+ * symlink operations.. same as page_symlink_inode_operations, with xattr
+ * stuff added
+ */
+struct inode_operations reiserfs_symlink_inode_operations = {
+    .readlink       = page_readlink,
+    .follow_link    = page_follow_link,
+    .setattr        = reiserfs_setattr,
+    .setxattr       = reiserfs_setxattr,
+    .getxattr       = reiserfs_getxattr,
+    .listxattr      = reiserfs_listxattr,
+    .removexattr    = reiserfs_removexattr,
+    .permission     = reiserfs_permission,
+
 };
 
+
+/*
+ * special file operations.. just xattr/acl stuff
+ */
+struct inode_operations reiserfs_special_inode_operations = {
+    .setattr        = reiserfs_setattr,
+    .setxattr       = reiserfs_setxattr,
+    .getxattr       = reiserfs_getxattr,
+    .listxattr      = reiserfs_listxattr,
+    .removexattr    = reiserfs_removexattr,
+    .permission     = reiserfs_permission,
+
+};
+
+

fs/reiserfs/super.c

@@ -17,6 +17,7 @@
 #include <linux/time.h>
 #include <asm/uaccess.h>
 #include <linux/reiserfs_fs.h>
+#include <linux/reiserfs_xattr.h>
 #include <linux/smp_lock.h>
 #include <linux/init.h>
 #include <linux/blkdev.h>
@@ -358,6 +359,16 @@ static void reiserfs_put_super (struct super_block * s)
   int i;
   struct reiserfs_transaction_handle th ;
 
+  if (REISERFS_SB(s)->xattr_root) {
+    d_invalidate (REISERFS_SB(s)->xattr_root);
+    dput (REISERFS_SB(s)->xattr_root);
+  }
+  
+  if (REISERFS_SB(s)->priv_root) {
+    d_invalidate (REISERFS_SB(s)->priv_root);
+    dput (REISERFS_SB(s)->priv_root);
+  }
+
   /* change file system state to current state if it was mounted with read-write permissions */
   if (!(s->s_flags & MS_RDONLY)) {
     journal_begin(&th, s, 10) ;
@@ -669,6 +680,8 @@ static int reiserfs_parse_options (struct super_block * s, char * options, /* st
 	{"conv", 0, 0, 1<<REISERFS_CONVERT, 0},
 	{"attrs", 0, 0, 1<<REISERFS_ATTRS, 0},
 	{"noattrs", 0, 0, 0, 1<<REISERFS_ATTRS},
+	{"user_xattr", 0, 0, 1<<REISERFS_XATTRS_USER, 0},
+	{"nouser_xattr", 0, 0, 0, 1<<REISERFS_XATTRS_USER},
 	{"nolog", 0, 0, 0, 0}, /* This is unsupported */
 	{"replayonly", 0, 0, 1<<REPLAYONLY, 0},
 	{"block-allocator", 'a', balloc, 0, 0},
@@ -813,6 +826,7 @@ static int reiserfs_remount (struct super_block * s, int * mount_flags, char * a
   safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
   safe_mask |= 1 << REISERFS_TEST4;
   safe_mask |= 1 << REISERFS_ATTRS;
+  safe_mask |= 1 << REISERFS_XATTRS_USER;
 
   /* Update the bitmask, taking care to keep
    * the bits we're not allowed to change here */
@@ -836,6 +850,7 @@ static int reiserfs_remount (struct super_block * s, int * mount_flags, char * a
   }
 
   if (*mount_flags & MS_RDONLY) {
+    reiserfs_xattr_init (s, *mount_flags);
     /* remount read-only */
     if (s->s_flags & MS_RDONLY)
       /* it is read-only already */
@@ -852,8 +867,10 @@ static int reiserfs_remount (struct super_block * s, int * mount_flags, char * a
     journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB (s));
   } else {
     /* remount read-write */
-    if (!(s->s_flags & MS_RDONLY))
+    if (!(s->s_flags & MS_RDONLY)) {
+	reiserfs_xattr_init (s, *mount_flags);
 	return 0; /* We are read-write already */
+    }
 
     handle_data_mode(s, mount_options);
     REISERFS_SB(s)->s_mount_state = sb_umount_state(rs) ;
@@ -874,8 +891,10 @@ static int reiserfs_remount (struct super_block * s, int * mount_flags, char * a
   journal_end(&th, s, 10) ;
   s->s_dirt = 0;
 
-  if (!( *mount_flags & MS_RDONLY ) )
+  if (!( *mount_flags & MS_RDONLY ) ) {
     finish_unfinished( s );
+    reiserfs_xattr_init (s, *mount_flags);
+  }
 
   return 0;
 }
@@ -1305,6 +1324,8 @@ static int reiserfs_fill_super (struct super_block * s, void * data, int silent)
     REISERFS_SB(s)->s_alloc_options.preallocmin = 4;
     /* Preallocate by 16 blocks (17-1) at once */
     REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
+    /* Initialize the rwsem for xattr dir */
+    init_rwsem(&REISERFS_SB(s)->xattr_dir_sem);
 
     jdev_name = NULL;
     if (reiserfs_parse_options (s, (char *) data, &(sbi->s_mount_opt), &blocks, &jdev_name, &commit_max_age) == 0) {
@@ -1450,12 +1471,24 @@ static int reiserfs_fill_super (struct super_block * s, void * data, int silent)
 	journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB (s));
 	journal_end(&th, s, 1) ;
 
+	if (reiserfs_xattr_init (s, s->s_flags)) {
+	    dput (s->s_root);
+	    s->s_root = NULL;
+	    goto error;
+	}
+
 	/* look for files which were to be removed in previous session */
 	finish_unfinished (s);
     } else {
 	if ( old_format_only(s) && !silent) {
 	    reiserfs_warning("reiserfs: using 3.5.x disk format\n") ;
 	}
+
+	if (reiserfs_xattr_init (s, s->s_flags)) {
+	    dput (s->s_root);
+	    s->s_root = NULL;
+	    goto error;
+	}
     }
     // mark hash in super block: it could be unset. overwrite should be ok
     set_sb_hash_function_code( rs, function2code(sbi->s_hash_function ) );
@@ -1523,6 +1556,9 @@ init_reiserfs_fs ( void )
 		return ret;
 	}
 
+        if ((ret = reiserfs_xattr_register_handlers ()))
+            goto failed_reiserfs_xattr_register_handlers;
+
 	reiserfs_proc_info_global_init ();
 	reiserfs_proc_register_global ("version", reiserfs_global_version_in_proc);
 
@@ -1532,6 +1568,9 @@ init_reiserfs_fs ( void )
 		return 0;
 	}
 
+        reiserfs_xattr_unregister_handlers ();
+
+failed_reiserfs_xattr_register_handlers:
 	reiserfs_proc_unregister_global ("version");
 	reiserfs_proc_info_global_done ();
 	destroy_inodecache ();
@@ -1542,6 +1581,7 @@ init_reiserfs_fs ( void )
 static void __exit
 exit_reiserfs_fs ( void )
 {
+        reiserfs_xattr_unregister_handlers ();
 	reiserfs_proc_unregister_global ("version");
 	reiserfs_proc_info_global_done ();
         unregister_filesystem (& reiserfs_fs_type);

fs/reiserfs/xattr_user.c

+#include <linux/reiserfs_fs.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+#include <linux/xattr.h>
+#include <linux/reiserfs_xattr.h>
+#include <asm/uaccess.h>
+
+#define XATTR_USER_PREFIX "user."
+
+static int
+user_get (struct inode *inode, const char *name, void *buffer, size_t size)
+{
+
+    int error;
+
+    if (strlen(name) < sizeof(XATTR_USER_PREFIX))
+        return -EINVAL;
+
+    if (!reiserfs_xattrs_user (inode->i_sb))
+        return -EOPNOTSUPP;
+
+    error = permission (inode, MAY_READ, NULL);
+    if (error)
+        return error;
+
+    return reiserfs_xattr_get (inode, name, buffer, size);
+}
+
+static int
+user_set (struct inode *inode, const char *name, const void *buffer,
+          size_t size, int flags)
+{
+
+    int error;
+
+    if (strlen(name) < sizeof(XATTR_USER_PREFIX))
+        return -EINVAL;
+
+    if (!reiserfs_xattrs_user (inode->i_sb))
+        return -EOPNOTSUPP;
+
+    if (!S_ISREG (inode->i_mode) &&
+        (!S_ISDIR (inode->i_mode) || inode->i_mode & S_ISVTX))
+        return -EPERM;
+
+    error = permission (inode, MAY_WRITE, NULL);
+    if (error)
+        return error;
+
+    return reiserfs_xattr_set (inode, name, buffer, size, flags);
+}
+
+static int
+user_del (struct inode *inode, const char *name)
+{
+    int error;
+
+    if (strlen(name) < sizeof(XATTR_USER_PREFIX))
+        return -EINVAL;
+
+    if (!reiserfs_xattrs_user (inode->i_sb))
+        return -EOPNOTSUPP;
+
+    if (!S_ISREG (inode->i_mode) &&
+        (!S_ISDIR (inode->i_mode) || inode->i_mode & S_ISVTX))
+        return -EPERM;
+
+    error = permission (inode, MAY_WRITE, NULL);
+    if (error)
+        return error;
+
+    return 0;
+}
+
+static int
+user_list (struct inode *inode, const char *name, int namelen, char *out)
+{
+    int len = namelen;
+    if (!reiserfs_xattrs_user (inode->i_sb))
+        return 0;
+
+    if (out)
+        memcpy (out, name, len);
+
+    return len;
+}
+
+struct reiserfs_xattr_handler user_handler = {
+    prefix: XATTR_USER_PREFIX,
+    get: user_get,
+    set: user_set,
+    del: user_del,
+    list: user_list,
+};

include/linux/reiserfs_fs.h

@@ -287,7 +287,7 @@ struct unfm_nodeinfo {
 #define STAT_DATA_V2 1
 
 
-static inline struct reiserfs_inode_info *REISERFS_I(struct inode *inode)
+static inline struct reiserfs_inode_info *REISERFS_I(const struct inode *inode)
 {
 	return container_of(inode, struct reiserfs_inode_info, vfs_inode);
 }
@@ -1960,6 +1960,7 @@ void reiserfs_update_sd (struct reiserfs_transaction_handle *th, struct inode *
 
 void sd_attrs_to_i_attrs( __u16 sd_attrs, struct inode *inode );
 void i_attrs_to_sd_attrs( struct inode *inode, __u16 *sd_attrs );
+int reiserfs_setattr(struct dentry *dentry, struct iattr *attr);
 
 /* namei.c */
 void set_de_name_and_namelen (struct reiserfs_dir_entry * de);
@@ -2010,6 +2011,8 @@ int reiserfs_global_version_in_proc( char *buffer, char **start, off_t offset,
 
 /* dir.c */
 extern struct inode_operations reiserfs_dir_inode_operations;
+extern struct inode_operations reiserfs_symlink_inode_operations;
+extern struct inode_operations reiserfs_special_inode_operations;
 extern struct file_operations reiserfs_dir_operations;
 
 /* tail_conversion.c */
@@ -2237,6 +2240,9 @@ int reiserfs_unpack (struct inode * inode, struct file * filp);
 #define reiserfs_write_lock( sb ) lock_kernel()
 #define reiserfs_write_unlock( sb ) unlock_kernel()
  			         
+/* xattr stuff */
+#define REISERFS_XATTR_DIR_SEM(s) (REISERFS_SB(s)->xattr_dir_sem)
+
 #endif /* _LINUX_REISER_FS_H */
 
 

include/linux/reiserfs_fs_i.h

@@ -22,7 +22,8 @@ typedef enum {
       truncate or unlink. Safe link is used to avoid leakage of disk
       space on crash with some files open, but unlinked. */
     i_link_saved_unlink_mask   =  0x0010,
-    i_link_saved_truncate_mask =  0x0020
+    i_link_saved_truncate_mask =  0x0020,
+    i_priv_object              =  0x0080,
 } reiserfs_inode_flags;
 
 

include/linux/reiserfs_fs_sb.h

@@ -6,6 +6,7 @@
 
 #ifdef __KERNEL__
 #include <linux/workqueue.h>
+#include <linux/rwsem.h>
 #endif
 
 typedef enum {
@@ -251,7 +252,6 @@ struct reiserfs_journal {
 
 #define JOURNAL_DESC_MAGIC "ReIsErLB" /* ick.  magic string to find desc blocks in the journal */
 
-
 typedef __u32 (*hashf_t) (const signed char *, int);
 
 struct reiserfs_bitmap_info
@@ -395,6 +395,10 @@ struct reiserfs_sb_info
     struct proc_dir_entry *procdir;
     int reserved_blocks; /* amount of blocks reserved for further allocations */
     spinlock_t bitmap_lock; /* this lock on now only used to protect reserved_blocks variable */
+    struct dentry *priv_root; /* root of /.reiserfs_priv */
+    struct dentry *xattr_root; /* root of /.reiserfs_priv/.xa */
+    struct rw_semaphore xattr_dir_sem;
+
 };
 
 /* Definitions of reiserfs on-disk properties: */
@@ -437,6 +441,8 @@ enum reiserfs_mount_options {
     REISERFS_NO_UNHASHED_RELOCATION,
     REISERFS_HASHED_RELOCATION,
     REISERFS_ATTRS,
+    REISERFS_XATTRS,
+    REISERFS_XATTRS_USER,
 
     REISERFS_TEST1,
     REISERFS_TEST2,
@@ -462,6 +468,9 @@ enum reiserfs_mount_options {
 #define reiserfs_data_log(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_DATA_LOG))
 #define reiserfs_data_ordered(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_DATA_ORDERED))
 #define reiserfs_data_writeback(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_DATA_WRITEBACK))
+#define reiserfs_xattrs(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_XATTRS))
+#define reiserfs_xattrs_user(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_XATTRS_USER))
+#define reiserfs_xattrs_optional(s) reiserfs_xattrs_user(s)
 
 void reiserfs_file_buffer (struct buffer_head * bh, int list);
 extern struct file_system_type reiserfs_fs_type;

include/linux/reiserfs_xattr.h

+/*
+  File: linux/reiserfs_xattr.h
+*/
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/xattr.h>
+
+/* Magic value in header */
+#define REISERFS_XATTR_MAGIC 0x52465841 /* "RFXA" */
+
+struct reiserfs_xattr_header {
+    __u32 h_magic;              /* magic number for identification */
+    __u32 h_hash;               /* hash of the value */
+};
+
+#ifdef __KERNEL__
+
+struct reiserfs_xattr_handler {
+	char *prefix;
+        int (*init)(void);
+        void (*exit)(void);
+	int (*get)(struct inode *inode, const char *name, void *buffer,
+		   size_t size);
+	int (*set)(struct inode *inode, const char *name, const void *buffer,
+		   size_t size, int flags);
+	int (*del)(struct inode *inode, const char *name);
+        int (*list)(struct inode *inode, const char *name, int namelen, char *out);
+        struct list_head handlers;
+};
+
+
+#ifdef CONFIG_REISERFS_FS_XATTR
+#define is_reiserfs_priv_object(inode) (REISERFS_I(inode)->i_flags & i_priv_object)
+ssize_t reiserfs_getxattr (struct dentry *dentry, const char *name,
+			   void *buffer, size_t size);
+int reiserfs_setxattr (struct dentry *dentry, const char *name,
+                       const void *value, size_t size, int flags);
+ssize_t reiserfs_listxattr (struct dentry *dentry, char *buffer, size_t size);
+int reiserfs_removexattr (struct dentry *dentry, const char *name);
+int reiserfs_delete_xattrs (struct inode *inode);
+int reiserfs_chown_xattrs (struct inode *inode, struct iattr *attrs);
+int reiserfs_xattr_init (struct super_block *sb, int mount_flags);
+int reiserfs_permission (struct inode *inode, int mask, struct nameidata *nd);
+
+int reiserfs_xattr_del (struct inode *, const char *);
+int reiserfs_xattr_get (const struct inode *, const char *, void *, size_t);
+int reiserfs_xattr_set (struct inode *, const char *, const void *,
+                               size_t, int);
+
+extern struct reiserfs_xattr_handler user_handler;
+
+int reiserfs_xattr_register_handlers (void) __init;
+void reiserfs_xattr_unregister_handlers (void);
+
+static inline void
+reiserfs_write_lock_xattrs(struct super_block *sb)
+{
+    down_write (&REISERFS_XATTR_DIR_SEM(sb));
+}
+static inline void
+reiserfs_write_unlock_xattrs(struct super_block *sb)
+{
+    up_write (&REISERFS_XATTR_DIR_SEM(sb));
+}
+static inline void
+reiserfs_read_lock_xattrs(struct super_block *sb)
+{
+    down_read (&REISERFS_XATTR_DIR_SEM(sb));
+}
+
+static inline void
+reiserfs_read_unlock_xattrs(struct super_block *sb)
+{
+    up_read (&REISERFS_XATTR_DIR_SEM(sb));
+}
+
+#else
+
+#define is_reiserfs_priv_object(inode) 0
+#define reiserfs_getxattr NULL
+#define reiserfs_setxattr NULL
+#define reiserfs_listxattr NULL
+#define reiserfs_removexattr NULL
+#define reiserfs_write_lock_xattrs(sb)
+#define reiserfs_write_unlock_xattrs(sb)
+#define reiserfs_read_lock_xattrs(sb)
+#define reiserfs_read_unlock_xattrs(sb)
+
+#define reiserfs_permission NULL
+
+#define reiserfs_xattr_register_handlers() 0
+#define reiserfs_xattr_unregister_handlers()
+
+static inline int reiserfs_delete_xattrs (struct inode *inode) { return 0; };
+static inline int reiserfs_chown_xattrs (struct inode *inode, struct iattr *attrs) { return 0; };
+static inline int reiserfs_xattr_init (struct super_block *sb, int mount_flags) { return 0; };
+#endif
+
+#endif  /* __KERNEL__ */