mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-09-12 17:02:05 +03:00
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@24136 3c298f89-4303-0410-b956-a3cf2f4a3e73
124 lines
3.4 KiB
Diff
124 lines
3.4 KiB
Diff
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
|
|
@@ -3994,6 +3994,58 @@ 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",
|
|
@@ -4024,11 +4076,15 @@ 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();
|
|
@@ -4044,6 +4100,8 @@ out4:
|
|
|
|
static void __exit exit_ext4_fs(void)
|
|
{
|
|
+ unregister_as_ext2();
|
|
+ unregister_as_ext3();
|
|
unregister_filesystem(&ext4_fs_type);
|
|
destroy_inodecache();
|
|
exit_ext4_xattr();
|