linux-kernel - [PATCH 3/6] ext4: don't inherit inappropriate inode flags from parent

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Date:	Wed,  3 Dec 2008 19:55:00 +0000
From:	"Duane Griffin" <duaneg@...da.com>
To:	akpm@...ux-foundation.org
Cc:	Andreas Dilger <adilger@....com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	Duane Griffin <duaneg@...da.com>
Subject: [PATCH 3/6] ext4: don't inherit inappropriate inode flags from parent

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>
---
 fs/ext4/ext4.h   |    8 ++++++++
 fs/ext4/ialloc.c |    2 +-
 2 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 8370ffd..63e5163 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -247,6 +247,14 @@ struct flex_groups {
 #define EXT4_FL_USER_VISIBLE		0x000BDFFF /* User visible flags */
 #define EXT4_FL_USER_MODIFIABLE		0x000B80FF /* 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_COMPRBLK_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 08cac9f..6fd3f3c 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -813,7 +813,7 @@ 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 */
-- 
1.5.6.4

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