From ead6596b9e776ac32d82f7d1931d7638e6d4a7bd Mon Sep 17 00:00:00 2001 From: Eric Sandeen Date: Sat, 10 Feb 2007 01:46:08 -0800 Subject: [PATCH] ext4: refuse ro to rw remount of fs with orphan inodes In the rare case where we have skipped orphan inode processing due to a readonly block device, and the block device subsequently changes back to read-write, disallow a remount,rw transition of the filesystem when we have an unprocessed orphan inodes as this would corrupt the list. Ideally we should process the orphan inode list during the remount, but that's trickier, and this plugs the hole for now. Signed-off-by: Eric Sandeen Cc: "Stephen C. Tweedie" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ext4/super.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'fs/ext4') diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 486a641..463b52b 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -2419,6 +2419,22 @@ static int ext4_remount (struct super_block * sb, int * flags, char * data) err = -EROFS; goto restore_opts; } + + /* + * If we have an unprocessed orphan list hanging + * around from a previously readonly bdev mount, + * require a full umount/remount for now. + */ + if (es->s_last_orphan) { + printk(KERN_WARNING "EXT4-fs: %s: couldn't " + "remount RDWR because of unprocessed " + "orphan inode list. Please " + "umount/remount instead.\n", + sb->s_id); + err = -EINVAL; + goto restore_opts; + } + /* * Mounting a RDONLY partition read-write, so reread * and store the current valid flag. (It may have -- cgit v1.1