ext3: copy i_flags to inode flags on write

Propagate flags such as S_APPEND, S_IMMUTABLE, etc.  from i_flags into
ext2-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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 22 insertions, 0 deletions

diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index e2a0ea50af1d..9fd0ec5ba0d0 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -133,6 +133,7 @@ extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
 extern void ext2_truncate (struct inode *);
 extern int ext2_setattr (struct dentry *, struct iattr *);
 extern void ext2_set_inode_flags(struct inode *inode);
+extern void ext2_get_inode_flags(struct ext2_inode_info *);
 
 /* ioctl.c */
 extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 9fa1bd65a028..0079b2cd5314 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -1055,6 +1055,25 @@ void ext2_set_inode_flags(struct inode *inode)
                 inode->i_flags |= S_DIRSYNC;
 }
 
+/* Propagate flags from i_flags to EXT2_I(inode)->i_flags */
+void ext2_get_inode_flags(struct ext2_inode_info *ei)
+{
+        unsigned int flags = ei->vfs_inode.i_flags;
+
+        ei->i_flags &= ~(EXT2_SYNC_FL|EXT2_APPEND_FL|
+                        EXT2_IMMUTABLE_FL|EXT2_NOATIME_FL|EXT2_DIRSYNC_FL);
+        if (flags & S_SYNC)
+                ei->i_flags |= EXT2_SYNC_FL;
+        if (flags & S_APPEND)
+                ei->i_flags |= EXT2_APPEND_FL;
+        if (flags & S_IMMUTABLE)
+                ei->i_flags |= EXT2_IMMUTABLE_FL;
+        if (flags & S_NOATIME)
+                ei->i_flags |= EXT2_NOATIME_FL;
+        if (flags & S_DIRSYNC)
+                ei->i_flags |= EXT2_DIRSYNC_FL;
+}
+
 void ext2_read_inode (struct inode * inode)
 {
         struct ext2_inode_info *ei = EXT2_I(inode);
@@ -1188,6 +1207,7 @@ static int ext2_update_inode(struct inode * inode, int do_sync)
         if (ei->i_state & EXT2_STATE_NEW)
                 memset(raw_inode, 0, EXT2_SB(sb)->s_inode_size);
 
+        ext2_get_inode_flags(ei);
         raw_inode->i_mode = cpu_to_le16(inode->i_mode);
         if (!(test_opt(sb, NO_UID32))) {
                 raw_inode->i_uid_low = cpu_to_le16(low_16_bits(uid));
diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c
index 4b099d310712..e85c48218239 100644
--- a/fs/ext2/ioctl.c
+++ b/fs/ext2/ioctl.c
@@ -27,6 +27,7 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
 
         switch (cmd) {
         case EXT2_IOC_GETFLAGS:
+                ext2_get_inode_flags(ei);
                 flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
                 return put_user(flags, (int __user *) arg);
         case EXT2_IOC_SETFLAGS: {