1 files changed, 10 insertions, 0 deletions

diff --git a/fs/super.c b/fs/super.c
index 0e7207b9815c..4906e2d8f400 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -892,6 +892,16 @@ vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void
         if (error)
                 goto out_sb;
 
+        /*
+         * filesystems should never set s_maxbytes larger than MAX_LFS_FILESIZE
+         * but s_maxbytes was an unsigned long long for many releases. Throw
+         * this warning for a little while to try and catch filesystems that
+         * violate this rule. This warning should be either removed or
+         * converted to a BUG() in 2.6.34.
+         */
+        WARN((mnt->mnt_sb->s_maxbytes < 0), "%s set sb->s_maxbytes to "
+                "negative value (%lld)\n", type->name, mnt->mnt_sb->s_maxbytes);
+
         mnt->mnt_mountpoint = mnt->mnt_root;
         mnt->mnt_parent = mnt;
         up_write(&mnt->mnt_sb->s_umount);