ext4: add debugging trigger for ext4_error()
Make it easy to test whether or not the error handling subsystem in
ext4 is working correctly. This allows us to simulate an ext4_error()
by echoing a string to /sys/fs/ext4/<dev>/trigger_fs_error.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: ksumrall@google.com
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 511011a..decc15d 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1197,6 +1197,7 @@
struct proc_dir_entry *s_proc;
struct kobject s_kobj;
struct completion s_kobj_unregister;
+ struct super_block *s_sb;
/* Journaling */
struct journal_s *s_journal;
