tree 1f4f607ca8e50a32ab3008ef39eff0fac2ee55ce
parent 9efc87976b0b405c942ba5282ae761028abf7362
author Amir Goldstein <amir73il@gmail.com> 1298872425 -0500
committer Greg Kroah-Hartman <gregkh@suse.de> 1301252448 -0700

ext4: skip orphan cleanup if fs has unknown ROCOMPAT features

commit d39195c33bb1b5fdcb0f416e8a0b34bfdb07a027 upstream.

Orphan cleanup is currently executed even if the file system has some
number of unknown ROCOMPAT features, which deletes inodes and frees
blocks, which could be very bad for some RO_COMPAT features,
especially the SNAPSHOT feature.

This patch skips the orphan cleanup if it contains readonly compatible
features not known by this ext4 implementation, which would prevent
the fs from being mounted (or remounted) readwrite.

Signed-off-by: Amir Goldstein <amir73il@users.sf.net>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>