linux-ext4 - [PATCH,STABLE 2.6.27 06/24] ext4: don't inherit inappropriate inode flags from parent

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Message-Id: <1243944576-20915-6-git-send-email-tytso@mit.edu>
Date:	Tue,  2 Jun 2009 08:09:18 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	stable@...nel.org
Cc:	linux-ext4@...r.kernel.org, Duane Griffin <duaneg@...da.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Theodore Ts'o" <tytso@....edu>
Subject: [PATCH,STABLE 2.6.27 06/24] ext4: don't inherit inappropriate inode flags from parent

From: Duane Griffin <duaneg@...da.com>

At present INDEX and EXTENTS are the only flags that new ext4 inodes do
NOT inherit from their parent.  In addition prevent the flags DIRTY,
ECOMPR, IMAGIC, TOPDIR, HUGE_FILE and EXT_MIGRATE from being inherited.
List inheritable flags explicitly to prevent future flags from
accidentally being inherited.

This fixes the TOPDIR flag inheritance bug reported at
http://bugzilla.kernel.org/show_bug.cgi?id=9866.

Signed-off-by: Duane Griffin <duaneg@...da.com>
Acked-by: Andreas Dilger <adilger@....com>
Cc: <linux-ext4@...r.kernel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
(cherry picked from commit 8fa43a81b97853fc69417bb6054182e78f95cbeb)
---
 fs/ext4/ext4.h   |    7 +++++++
 fs/ext4/ialloc.c |    2 +-
 2 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index eadbee3..ebc4f0d 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -248,6 +248,13 @@ 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. */
+#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
+			   EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
+			   EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
+			   EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
+			   EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
+
 /*
  * Inode dynamic state flags
  */
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index b9457e1..98f9f82 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -869,7 +869,7 @@ 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 */
-- 
1.6.3.1.1.g75fc.dirty

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