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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>
This commit is contained in:
Theodore Ts'o 2009-12-07 14:08:51 -05:00
parent c09eef305d
commit 24b584240a
2 changed files with 68 additions and 0 deletions
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10
fs/ext4/Kconfig
View File

@ -26,6 +26,16 @@ config EXT4_FS
If unsure, say N. 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 config EXT4_FS_XATTR
bool "Ext4 extended attributes" bool "Ext4 extended attributes"
depends on EXT4_FS depends on EXT4_FS

58
fs/ext4/super.c
View File

@ -3960,6 +3960,58 @@ static int ext4_get_sb(struct file_system_type *fs_type, int flags,
return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt); 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 = { static struct file_system_type ext4_fs_type = {
.owner = THIS_MODULE, .owner = THIS_MODULE,
.name = "ext4", .name = "ext4",
@ -3989,11 +4041,15 @@ static int __init init_ext4_fs(void)
err = init_inodecache(); err = init_inodecache();
if (err) if (err)
goto out1; goto out1;
register_as_ext2();
register_as_ext3();
err = register_filesystem(&ext4_fs_type); err = register_filesystem(&ext4_fs_type);
if (err) if (err)
goto out; goto out;
return 0; return 0;
out: out:
unregister_as_ext2();
unregister_as_ext3();
destroy_inodecache(); destroy_inodecache();
out1: out1:
exit_ext4_xattr(); exit_ext4_xattr();
@ -4009,6 +4065,8 @@ static int __init init_ext4_fs(void)
static void __exit exit_ext4_fs(void) static void __exit exit_ext4_fs(void)
{ {
unregister_as_ext2();
unregister_as_ext3();
unregister_filesystem(&ext4_fs_type); unregister_filesystem(&ext4_fs_type);
destroy_inodecache(); destroy_inodecache();
exit_ext4_xattr(); exit_ext4_xattr();