ext4: add ext4-specific kludge to avoid an oops after the disk disappears

The del_gendisk() function uninitializes the disk-specific data
structures, including the bdi structure, without telling anyone
else.  Once this happens, any attempt to call mark_buffer_dirty()
(for example, by ext4_commit_super), will cause a kernel OOPS.

Fix this for now until we can fix things in an architecturally correct
way.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index ee2f74a..5dcd0da 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -414,6 +414,22 @@ static void save_error_info(struct super_block *sb, const char *func,
        ext4_commit_super(sb, 1);
 }
 
+/*
+ * The del_gendisk() function uninitializes the disk-specific data
+ * structures, including the bdi structure, without telling anyone
+ * else.  Once this happens, any attempt to call mark_buffer_dirty()
+ * (for example, by ext4_commit_super), will cause a kernel OOPS.
+ * This is a kludge to prevent these oops until we can put in a proper
+ * hook in del_gendisk() to inform the VFS and file system layers.
+ */
+static int block_device_ejected(struct super_block *sb)
+{
+       struct inode *bd_inode = sb->s_bdev->bd_inode;
+       struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
+
+       return bdi->dev == NULL;
+}
+
 
 /* Deal with the reporting of failure conditions on a filesystem such as
  * inconsistencies detected or read IO failures.
@@ -4072,7 +4088,7 @@ static int ext4_commit_super(struct super_block *sb, int sync)
        struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
        int error = 0;
 
-       if (!sbh)
+       if (!sbh || block_device_ejected(sb))
                return error;
        if (buffer_write_io_error(sbh)) {
                /*