ext4: don't update s_rev_level if not required

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Don't update the superblock s_rev_level during mount if it isn't
actually necessary, only if superblock features are being set by
the kernel.  This was originally added for ext3 since it always
set the INCOMPAT_RECOVER and HAS_JOURNAL features during mount,
but this is not needed since no journal mode was added to ext4.

That will allow Geert to mount his 20-year-old ext2 rev 0.0 m68k
filesystem, as a testament of the backward compatibility of ext4.

Fixes: 0390131ba8 ("ext4: Allow ext4 to run without a journal")
Signed-off-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

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This commit is contained in:

Andreas Dilger 2019-02-14 17:52:18 -05:00 • committed by Theodore Ts'o

parent a58ca99266

commit c9e716eb9b

3 changed files with 5 additions and 3 deletions

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6

fs/ext4/ext4.h

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1

fs/ext4/inode.c

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1

fs/ext4/super.c

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