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

Duane Griffin
2008-06-19T15:42:17Z

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.

Signed-off-by: Duane Griffin <duaneg@dghda.com>
--

This is v2 with inheritable flags now explicitly specified, as per Andreas'
request.

---
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 8158083..1a4faa5 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -235,6 +235,14 @@ struct ext4_group_desc
#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_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 c6efbab..ff25d57 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -702,7 +702,7 @@ 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 */
--
1.5.4.5