Here is small patch, kerneldoc says:

> The ext4 filesystem requires that this feature be enabled in order to
> support filesystems that have the huge_file feature enabled [...]
> which is enabled by default by mke2fs.ext4.

Without this option dmesg says:

> Filesystem with huge files cannot be mounted read-write without CONFIG_LBD.

while mounting ext4 partition.

I tested ext4 with linux-2.6.30.10 kernel. _Seems_, relevant option was
renamed to CONFIG_LBDAF in later kernels.

-- 
WBRBW, Leonid Evdokimov
xmpp:[email protected] && http://darkk.net.ru && tel:+79050965222
Index: package/kernel/modules/fs.mk
===================================================================
--- package/kernel/modules/fs.mk        (revision 19496)
+++ package/kernel/modules/fs.mk        (working copy)
@@ -120,7 +120,8 @@
        CONFIG_EXT4_FS_POSIX_ACL=y \
        CONFIG_EXT4_FS_SECURITY=y \
        CONFIG_EXT4_FS \
-       CONFIG_JBD2
+       CONFIG_JBD2 \
+       CONFIG_LBD=y
   DEPENDS:= @LINUX_2_6 +kmod-crc16 $(if 
$(DUMP)$(CONFIG_FS_MBCACHE),+kmod-fs-mbcache)
   FILES:= \
        $(LINUX_DIR)/fs/ext4/ext4.$(LINUX_KMOD_SUFFIX) \

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