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[2/4] tune2fs: prevent stable_inodes feature from being cleared

Message ID 20200401203239.163679-3-ebiggers@kernel.org
State Accepted
Headers show
Series e2fsprogs: fix and document the stable_inodes feature | expand

Commit Message

Eric Biggers April 1, 2020, 8:32 p.m. UTC
From: Eric Biggers <ebiggers@google.com>

Similar to encrypt and verity, once the stable_inodes feature has been
enabled there may be files anywhere on the filesystem that require this
feature.  Therefore, in general it's unsafe to allow clearing it.  Don't
allow tune2fs to do so.  Like encrypt and verity, it can still be
cleared with debugfs if someone really knows what they're doing.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 misc/tune2fs.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
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Patch

diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index ca06c98b..81f90cbf 100644
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -181,8 +181,7 @@  static __u32 clear_ok_features[3] = {
 	EXT3_FEATURE_COMPAT_HAS_JOURNAL |
 		EXT2_FEATURE_COMPAT_RESIZE_INODE |
 		EXT2_FEATURE_COMPAT_DIR_INDEX |
-		EXT4_FEATURE_COMPAT_FAST_COMMIT |
-		EXT4_FEATURE_COMPAT_STABLE_INODES,
+		EXT4_FEATURE_COMPAT_FAST_COMMIT,
 	/* Incompat */
 	EXT2_FEATURE_INCOMPAT_FILETYPE |
 		EXT4_FEATURE_INCOMPAT_FLEX_BG |