tree 2f9cb8bb3f4c709aa666c7863b496f2757b261fb
parent 56889787cfa77dfd96f0b3a3e6a4f26c2e4a5134
author Theodore Ts'o <tytso@mit.edu> 1315145894 -0400
committer Theodore Ts'o <tytso@mit.edu> 1315145894 -0400

jbd2: add debugging information to jbd2_journal_dirty_metadata()

Add debugging information in case jbd2_journal_dirty_metadata() is
called with a buffer_head which didn't have
jbd2_journal_get_write_access() called on it, or if the journal_head
has the wrong transaction in it.  In addition, return an error code.
This won't change anything for ocfs2, which will BUG_ON() the non-zero
exit code.

For ext4, the caller of this function is ext4_handle_dirty_metadata(),
and on seeing a non-zero return code, will call __ext4_journal_stop(),
which will print the function and line number of the (buggy) calling
function and abort the journal.  This will allow us to recover instead
of bug halting, which is better from a robustness and reliability
point of view.

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