[EXT4 set 2][PATCH 1/5] cleanups: Propagate some i_flags to disk

[EXT4 set 2][PATCH 1/5] cleanups: Propagate some i_flags to disk

[Mingming Cao]

Propagate flags such as S_APPEND, S_IMMUTABLE, etc. from i_flags into
ext4-specific i_flags. Hence, when someone sets these flags via a different
interface than ioctl, they are stored correctly.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>

Index: linux-2.6.22-rc4/fs/ext4/inode.c
===================================================================
--- linux-2.6.22-rc4.orig/fs/ext4/inode.c	2007-06-11 17:24:01.000000000 -0700
+++ linux-2.6.22-rc4/fs/ext4/inode.c	2007-06-11 17:24:28.000000000 -0700
@@ -2583,6 +2583,25 @@
 		inode->i_flags |= S_DIRSYNC;
 }
 
+/* Propagate flags from i_flags to EXT4_I(inode)->i_flags */
+void ext4_get_inode_flags(struct ext4_inode_info *ei)
+{
+	unsigned int flags = ei->vfs_inode.i_flags;
+
+	ei->i_flags &= ~(EXT4_SYNC_FL|EXT4_APPEND_FL|
+			EXT4_IMMUTABLE_FL|EXT4_NOATIME_FL|EXT4_DIRSYNC_FL);
+	if (flags & S_SYNC)
+		ei->i_flags |= EXT4_SYNC_FL;
+	if (flags & S_APPEND)
+		ei->i_flags |= EXT4_APPEND_FL;
+	if (flags & S_IMMUTABLE)
+		ei->i_flags |= EXT4_IMMUTABLE_FL;
+	if (flags & S_NOATIME)
+		ei->i_flags |= EXT4_NOATIME_FL;
+	if (flags & S_DIRSYNC)
+		ei->i_flags |= EXT4_DIRSYNC_FL;
+}
+
 void ext4_read_inode(struct inode * inode)
 {
 	struct ext4_iloc iloc;
@@ -2742,6 +2761,7 @@
 	if (ei->i_state & EXT4_STATE_NEW)
 		memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size);
 
+	ext4_get_inode_flags(ei);
 	raw_inode->i_mode = cpu_to_le16(inode->i_mode);
 	if(!(test_opt(inode->i_sb, NO_UID32))) {
 		raw_inode->i_uid_low = cpu_to_le16(low_16_bits(inode->i_uid));
Index: linux-2.6.22-rc4/fs/ext4/ioctl.c
===================================================================
--- linux-2.6.22-rc4.orig/fs/ext4/ioctl.c	2007-06-11 17:24:01.000000000 -0700
+++ linux-2.6.22-rc4/fs/ext4/ioctl.c	2007-06-11 17:25:11.000000000 -0700
@@ -28,6 +28,7 @@
 
 	switch (cmd) {
 	case EXT4_IOC_GETFLAGS:
+		ext4_get_inode_flags(ei);
 		flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 		return put_user(flags, (int __user *) arg);
 	case EXT4_IOC_SETFLAGS: {
Index: linux-2.6.22-rc4/include/linux/ext4_fs.h
===================================================================
--- linux-2.6.22-rc4.orig/include/linux/ext4_fs.h	2007-06-11 17:24:01.000000000 -0700
+++ linux-2.6.22-rc4/include/linux/ext4_fs.h	2007-06-11 17:24:28.000000000 -0700
@@ -862,6 +862,7 @@
 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
 extern void ext4_truncate (struct inode *);
 extern void ext4_set_inode_flags(struct inode *);
+extern void ext4_get_inode_flags(struct ext4_inode_info *);
 extern void ext4_set_aops(struct inode *inode);
 extern int ext4_writepage_trans_blocks(struct inode *);
 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,

Re: [EXT4 set 2][PATCH 1/5] cleanups: Propagate some i_flags to disk

[Andrew Morton]

On Sun, 01 Jul 2007 03:36:12 -0400
Mingming Cao <cmm@us.ibm.com> wrote:

> Propagate flags such as S_APPEND, S_IMMUTABLE, etc. from i_flags into
> ext4-specific i_flags. Hence, when someone sets these flags via a different
> interface than ioctl, they are stored correctly.
> 

This changelog is inadequate.  I had to hunt down the equivalent ext3
patch's changelog to understand the reasons for this change.  Please update
this patch's changelog using the below: 

    ext3: copy i_flags to inode flags on write
    
    A patch that stores inode flags such as S_IMMUTABLE, S_APPEND, etc.  from
    i_flags to EXT3_I(inode)->i_flags when inode is written to disk.  The same
    thing is done on GETFLAGS ioctl.
    
    Quota code changes these flags on quota files (to make it harder for
    sysadmin to screw himself) and these changes were not correctly propagated
    into the filesystem (especially, lsattr did not show them and users were
    wondering...).
    
    Propagate flags such as S_APPEND, S_IMMUTABLE, etc.  from i_flags into
    ext3-specific i_flags.  Hence, when someone sets these flags via a
    different interface than ioctl, they are stored correctly.