X-Git-Url: http://git.rohieb.name/openwrt.git/blobdiff_plain/e71ac4855b7b46ec3670bfa3a0bbcf68bcd8a2ec..d5e6bde258d1c0f7e4119df4f95f1d94d69affc4:/target/linux/generic/patches-2.6.32/040-use_ext4_for_ext23.patch

diff --git a/target/linux/generic/patches-2.6.32/040-use_ext4_for_ext23.patch b/target/linux/generic/patches-2.6.32/040-use_ext4_for_ext23.patch
new file mode 100644
index 000000000..d5824f1bd
--- /dev/null
+++ b/target/linux/generic/patches-2.6.32/040-use_ext4_for_ext23.patch
@@ -0,0 +1,123 @@
+From 24b584240a0006ea7436cd35f5e8983eb76f1e6f Mon Sep 17 00:00:00 2001
+From: Theodore Ts'o <tytso@mit.edu>
+Date: Mon, 7 Dec 2009 14:08:51 -0500
+Subject: [PATCH] ext4: Use ext4 file system driver for ext2/ext3 file system mounts
+
+Add a new config option, CONFIG_EXT4_USE_FOR_EXT23 which if enabled,
+will cause ext4 to be used for either ext2 or ext3 file system mounts
+when ext2 or ext3 is not enabled in the configuration.
+
+This allows minimalist kernel fanatics to drop to file system drivers
+from their compiled kernel with out losing functionality.
+
+Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
+---
+ fs/ext4/Kconfig |   10 +++++++++
+ fs/ext4/super.c |   58 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ 2 files changed, 68 insertions(+), 0 deletions(-)
+
+--- a/fs/ext4/Kconfig
++++ b/fs/ext4/Kconfig
+@@ -26,6 +26,16 @@ config EXT4_FS
+ 
+ 	  If unsure, say N.
+ 
++config EXT4_USE_FOR_EXT23
++	bool "Use ext4 for ext2/ext3 file systems"
++	depends on !EXT3_FS || !EXT2_FS
++	default y
++	help
++	  Allow the ext4 file system driver code to be used for ext2 or
++	  ext3 file system mounts.  This allows users to reduce their
++	  compiled kernel size by using one file system driver for
++	  ext2, ext3, and ext4 file systems.
++
+ config EXT4_FS_XATTR
+ 	bool "Ext4 extended attributes"
+ 	depends on EXT4_FS
+--- a/fs/ext4/super.c
++++ b/fs/ext4/super.c
+@@ -3989,6 +3989,58 @@ static int ext4_get_sb(struct file_syste
+ 	return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt);
+ }
+ 
++#if !defined(CONTIG_EXT2_FS) && defined(CONFIG_EXT4_USE_FOR_EXT23)
++static struct file_system_type ext2_fs_type = {
++	.owner		= THIS_MODULE,
++	.name		= "ext2",
++	.get_sb		= ext4_get_sb,
++	.kill_sb	= kill_block_super,
++	.fs_flags	= FS_REQUIRES_DEV,
++};
++
++static inline void register_as_ext2(void)
++{
++	int err = register_filesystem(&ext2_fs_type);
++	if (err)
++		printk(KERN_WARNING
++		       "EXT4-fs: Unable to register as ext2 (%d)\n", err);
++}
++
++static inline void unregister_as_ext2(void)
++{
++	unregister_filesystem(&ext2_fs_type);
++}
++#else
++static inline void register_as_ext2(void) { }
++static inline void unregister_as_ext2(void) { }
++#endif
++
++#if !defined(CONTIG_EXT3_FS) && defined(CONFIG_EXT4_USE_FOR_EXT23)
++static struct file_system_type ext3_fs_type = {
++	.owner		= THIS_MODULE,
++	.name		= "ext3",
++	.get_sb		= ext4_get_sb,
++	.kill_sb	= kill_block_super,
++	.fs_flags	= FS_REQUIRES_DEV,
++};
++
++static inline void register_as_ext3(void)
++{
++	int err = register_filesystem(&ext3_fs_type);
++	if (err)
++		printk(KERN_WARNING
++		       "EXT4-fs: Unable to register as ext3 (%d)\n", err);
++}
++
++static inline void unregister_as_ext3(void)
++{
++	unregister_filesystem(&ext3_fs_type);
++}
++#else
++static inline void register_as_ext3(void) { }
++static inline void unregister_as_ext3(void) { }
++#endif
++
+ static struct file_system_type ext4_fs_type = {
+ 	.owner		= THIS_MODULE,
+ 	.name		= "ext4",
+@@ -4018,11 +4070,15 @@ static int __init init_ext4_fs(void)
+ 	err = init_inodecache();
+ 	if (err)
+ 		goto out1;
++	register_as_ext2();
++	register_as_ext3();
+ 	err = register_filesystem(&ext4_fs_type);
+ 	if (err)
+ 		goto out;
+ 	return 0;
+ out:
++	unregister_as_ext2();
++	unregister_as_ext3();
+ 	destroy_inodecache();
+ out1:
+ 	exit_ext4_xattr();
+@@ -4038,6 +4094,8 @@ out4:
+ 
+ static void __exit exit_ext4_fs(void)
+ {
++	unregister_as_ext2();
++	unregister_as_ext3();
+ 	unregister_filesystem(&ext4_fs_type);
+ 	destroy_inodecache();
+ 	exit_ext4_xattr();