Mark a buffer as containing dirty metadata
int journal_dirty_metadata(handle_t * handle, struct buffer_head * bh);
handle
transaction to add buffer to.
bh
buffer to mark
Mark dirty metadata which needs to be journaled as part of the current transaction.
The buffer is placed on the transaction's metadata list and is marked as belonging to the transaction.
Returns error number or 0 on success.
Special care needs to be taken if the buffer already belongs to the current committing transaction (in which case we should have frozen data present for that commit). In that case, we don't relink the
that only gets done when the old transaction finally completes its commit.