2008-06-05 04:37:56

by Andrew Morton

[permalink] [raw]
Subject: + ext4-dont-inherit-inappropriate-inode-flags-from-parent.patch added to -mm tree

The patch titled
ext4: don't inherit inappropriate inode flags from parent
has been added to the -mm tree. Its filename is

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See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this

The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/

Subject: ext4: don't inherit inappropriate inode flags from parent
From: "Duane Griffin" <[email protected]>

Fix the TOPDIR flag inheritance bug reported at

Some file attributes have sticky behaviour in ext2/3 whereas I believe
it should not. Namely, a directory marked with chattr +T serves "to be
the top of directory hierarchies for the purposes of the Orlov block
allocator", as the manpage says.

It seems wrong that subdirectories stickily inherit the +T flag: they
are obviously not top-level! Even files get the T attribute this way,
even though the chattr manpages only documents it for directories.

Also prevent inheritance of other flags that Andreas Dilger identified as
inappropriate to inherit

At present INDEX and EXTENTS are the only flagis that new ext4 inodes do
NOT inherit from their parent. In addition prevent the flags DIRTY, ECOMPR,
IMAGIC, TOPDIR and HUGE_FILE from being inherited.

Signed-off-by: Duane Griffin <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

fs/ext4/ext4.h | 5 +++++
fs/ext4/ialloc.c | 2 +-
2 files changed, 6 insertions(+), 1 deletion(-)

diff -puN fs/ext4/ext4.h~ext4-dont-inherit-inappropriate-inode-flags-from-parent fs/ext4/ext4.h
--- a/fs/ext4/ext4.h~ext4-dont-inherit-inappropriate-inode-flags-from-parent
+++ a/fs/ext4/ext4.h
@@ -249,6 +249,11 @@ struct flex_groups {
#define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
#define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */

+/* Flags that should be inherited by new inodes from their parent. */
* Inode dynamic state flags
diff -puN fs/ext4/ialloc.c~ext4-dont-inherit-inappropriate-inode-flags-from-parent fs/ext4/ialloc.c
--- a/fs/ext4/ialloc.c~ext4-dont-inherit-inappropriate-inode-flags-from-parent
+++ a/fs/ext4/ialloc.c
@@ -798,7 +798,7 @@ got:
* newly created directory and file only if -o extent mount option is
* specified
- ei->i_flags = EXT4_I(dir)->i_flags & ~(EXT4_INDEX_FL|EXT4_EXTENTS_FL);
+ ei->i_flags = EXT4_I(dir)->i_flags & EXT4_FL_INHERITED;
if (S_ISLNK(mode))
ei->i_flags &= ~(EXT4_IMMUTABLE_FL|EXT4_APPEND_FL);
/* dirsync only applies to directories */

Patches currently in -mm which might be from [email protected] are