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Date:	Thu, 12 Jun 2008 13:26:52 -0300
From:	Thadeu Lima de Souza Cascardo <cascardo@...aslivre.org>
To:	linux-ext4@...r.kernel.org
Subject: [PATCH] Support for namespace "gnu" for extended attributes in ext2

This patch adds support for the "gnu" extended attributes namespace in
ext2. This namespace is needed for Hurd, for things like translators.
---
 fs/ext2/Makefile    |    3 +-
 fs/ext2/xattr.c     |    2 +
 fs/ext2/xattr.h     |    2 +
 fs/ext2/xattr_gnu.c |   56 +++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 62 insertions(+), 1 deletions(-)
 create mode 100644 fs/ext2/xattr_gnu.c

diff --git a/fs/ext2/Makefile b/fs/ext2/Makefile
index e0b2b43..42184c1 100644
--- a/fs/ext2/Makefile
+++ b/fs/ext2/Makefile
@@ -7,7 +7,8 @@ obj-$(CONFIG_EXT2_FS) += ext2.o
 ext2-y := balloc.o dir.o file.o fsync.o ialloc.o inode.o \
 	  ioctl.o namei.o super.o symlink.o
 
-ext2-$(CONFIG_EXT2_FS_XATTR)	 += xattr.o xattr_user.o xattr_trusted.o
+ext2-$(CONFIG_EXT2_FS_XATTR)	 += xattr.o xattr_user.o xattr_trusted.o \
+				    xattr_gnu.o
 ext2-$(CONFIG_EXT2_FS_POSIX_ACL) += acl.o
 ext2-$(CONFIG_EXT2_FS_SECURITY)	 += xattr_security.o
 ext2-$(CONFIG_EXT2_FS_XIP)	 += xip.o
diff --git a/fs/ext2/xattr.c b/fs/ext2/xattr.c
index 987a526..93717ff 100644
--- a/fs/ext2/xattr.c
+++ b/fs/ext2/xattr.c
@@ -110,6 +110,7 @@ static struct xattr_handler *ext2_xattr_handler_map[] = {
 #ifdef CONFIG_EXT2_FS_SECURITY
 	[EXT2_XATTR_INDEX_SECURITY]	     = &ext2_xattr_security_handler,
 #endif
+	[EXT2_XATTR_INDEX_GNU]		     = &ext2_xattr_gnu_handler,
 };
 
 struct xattr_handler *ext2_xattr_handlers[] = {
@@ -122,6 +123,7 @@ struct xattr_handler *ext2_xattr_handlers[] = {
 #ifdef CONFIG_EXT2_FS_SECURITY
 	&ext2_xattr_security_handler,
 #endif
+	&ext2_xattr_gnu_handler,
 	NULL
 };
 
diff --git a/fs/ext2/xattr.h b/fs/ext2/xattr.h
index bf8175b..da3b5c7 100644
--- a/fs/ext2/xattr.h
+++ b/fs/ext2/xattr.h
@@ -22,6 +22,7 @@
 #define EXT2_XATTR_INDEX_TRUSTED		4
 #define	EXT2_XATTR_INDEX_LUSTRE			5
 #define EXT2_XATTR_INDEX_SECURITY	        6
+#define EXT2_XATTR_INDEX_GNU			7
 
 struct ext2_xattr_header {
 	__le32	h_magic;	/* magic number for identification */
@@ -60,6 +61,7 @@ extern struct xattr_handler ext2_xattr_trusted_handler;
 extern struct xattr_handler ext2_xattr_acl_access_handler;
 extern struct xattr_handler ext2_xattr_acl_default_handler;
 extern struct xattr_handler ext2_xattr_security_handler;
+extern struct xattr_handler ext2_xattr_gnu_handler;
 
 extern ssize_t ext2_listxattr(struct dentry *, char *, size_t);
 
diff --git a/fs/ext2/xattr_gnu.c b/fs/ext2/xattr_gnu.c
new file mode 100644
index 0000000..9515438
--- /dev/null
+++ b/fs/ext2/xattr_gnu.c
@@ -0,0 +1,56 @@
+/*
+ * linux/fs/ext2/xattr_user.c
+ * Handler for extended user attributes.
+ *
+ * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@...puter.org>
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include "ext2.h"
+#include "xattr.h"
+
+#define XATTR_GNU_PREFIX "gnu."
+
+static size_t
+ext2_xattr_gnu_list(struct inode *inode, char *list, size_t list_size,
+		     const char *name, size_t name_len)
+{
+	const size_t prefix_len = sizeof(XATTR_GNU_PREFIX)-1;
+	const size_t total_len = prefix_len + name_len + 1;
+
+	if (list && total_len <= list_size) {
+		memcpy(list, XATTR_GNU_PREFIX, prefix_len);
+		memcpy(list+prefix_len, name, name_len);
+		list[prefix_len + name_len] = '\0';
+	}
+	return total_len;
+}
+
+static int
+ext2_xattr_gnu_get(struct inode *inode, const char *name,
+		    void *buffer, size_t size)
+{
+	if (strcmp(name, "") == 0)
+		return -EINVAL;
+	return ext2_xattr_get(inode, EXT2_XATTR_INDEX_GNU, name, buffer, size);
+}
+
+static int
+ext2_xattr_user_set(struct inode *inode, const char *name,
+		    const void *value, size_t size, int flags)
+{
+	if (strcmp(name, "") == 0)
+		return -EINVAL;
+
+	return ext2_xattr_set(inode, EXT2_XATTR_INDEX_GNU, name,
+			      value, size, flags);
+}
+
+struct xattr_handler ext2_xattr_gnu_handler = {
+	.prefix	= XATTR_GNU_PREFIX,
+	.list	= ext2_xattr_gnu_list,
+	.get	= ext2_xattr_gnu_get,
+	.set	= ext2_xattr_gnu_set,
+};
-- 
1.5.5.4
--
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