Commit 28e35e42 authored by Tao Ma's avatar Tao Ma Committed by Theodore Ts'o
Browse files

jbd2: Fix the wrong calculation of t_max_wait in update_t_max_wait 



t_max_wait is added in commit 8e85fb3f to indicate how long we
were waiting for new transaction to start. In commit 6d0bf005,
it is moved to another function named update_t_max_wait to
avoid a build warning. But the wrong thing is that the original
'ts' is initialized in the start of function start_this_handle
and we can calculate t_max_wait in the right way. while with
this change, ts is initialized within the function and t_max_wait
can never be calculated right.

This patch moves the initialization of ts to the original beginning
of start_this_handle and pass it to function update_t_max_wait so
that it can be calculated right and the build warning is avoided also.

Cc: Jan Kara <jack@suse.cz>
Signed-off-by: default avatarTao Ma <boyu.mt@taobao.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: default avatarEric Sandeen <sandeen@redhat.com>
parent f6d2f6b3

fs/jbd2/transaction.c

+5 −5
Original line number Diff line number Diff line
@@ -82,7 +82,7 @@ jbd2_get_transaction(journal_t *journal, transaction_t *transaction) 
 */



/*

 * Update transiaction's maximum wait time, if debugging is enabled.

 * Update transaction's maximum wait time, if debugging is enabled.

 *

 * In order for t_max_wait to be reliable, it must be protected by a

 * lock.  But doing so will mean that start_this_handle() can not be
@@ -91,11 +91,10 @@ jbd2_get_transaction(journal_t *journal, transaction_t *transaction) 
 * means that maximum wait time reported by the jbd2_run_stats

 * tracepoint will always be zero.

 */

static inline void update_t_max_wait(transaction_t *transaction)

static inline void update_t_max_wait(transaction_t *transaction,

				     unsigned long ts)

{

#ifdef CONFIG_JBD2_DEBUG

	unsigned long ts = jiffies;



	if (jbd2_journal_enable_debug &&

	    time_after(transaction->t_start, ts)) {

		ts = jbd2_time_diff(ts, transaction->t_start);
@@ -121,6 +120,7 @@ static int start_this_handle(journal_t *journal, handle_t *handle, 
	tid_t		tid;

	int		needed, need_to_start;

	int		nblocks = handle->h_buffer_credits;

	unsigned long ts = jiffies;



	if (nblocks > journal->j_max_transaction_buffers) {

		printk(KERN_ERR "JBD: %s wants too many credits (%d > %d)\n",
@@ -271,7 +271,7 @@ repeat: 
	/* OK, account for the buffers that this operation expects to

	 * use and add the handle to the running transaction. 

	 */

	update_t_max_wait(transaction);

	update_t_max_wait(transaction, ts);

	handle->h_transaction = transaction;

	atomic_inc(&transaction->t_updates);

	atomic_inc(&transaction->t_handle_count);

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