Commit 9172796b authored Oct 15, 2015 by Darrick J. Wong Committed by Theodore Ts'o Oct 15, 2015

ext4: promote ext4 over ext2 in the default probe order

Prevent clean ext3 filesystems from mounting by default with the ext2
driver (with no journal!) by putting ext4 ahead of ext2 in the default
probe order. This will have the effect of mounting ext2 filesystems
with ext4.ko by default, which is a safer failure than hoping the user
notices that their journalled ext3 is now running without a journal!

Users who require ext2.ko for ext2 can either disable ext4.ko or
explicitly request ext2 via "mount -t ext2" or "rootfstype=ext2".

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

parent 8595798c

fs/Makefile

+4 −3

Original line number	Diff line number	Diff line
		@@ -63,10 +63,11 @@ obj-$(CONFIG_DLM) += dlm/
		# Do not add any filesystems before this line
		obj-$(CONFIG_FSCACHE) += fscache/
		obj-$(CONFIG_REISERFS_FS) += reiserfs/
		obj-$(CONFIG_EXT2_FS) += ext2/
		# We place ext4 after ext2 so plain ext2 root fs's are mounted using ext2
		# unless explicitly requested by rootfstype
		obj-$(CONFIG_EXT4_FS) += ext4/
		# We place ext4 before ext2 so that clean ext3 root fs's do NOT mount using the
		# ext2 driver, which doesn't know about journalling! Explicitly request ext2
		# by giving the rootfstype= parameter.
		obj-$(CONFIG_EXT2_FS) += ext2/
		obj-$(CONFIG_JBD2) += jbd2/
		obj-$(CONFIG_CRAMFS) += cramfs/
		obj-$(CONFIG_SQUASHFS) += squashfs/

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