aboutsummaryrefslogtreecommitdiffstats
path: root/fs
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2010-08-13 17:59:26 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-13 17:59:26 -0700
commit83ae170092c8ec4d8a268d93438054e32493ee17 (patch)
tree829a2558434b702a447c62a36663c8063da6cdee /fs
parent78b148696d380698270a15352bdb733631872aee (diff)
parent6d0bf00512b3b1b5d09d9a44919983eec1cc6fd0 (diff)
downloadmrst-s0i3-test-83ae170092c8ec4d8a268d93438054e32493ee17.tar.gz
mrst-s0i3-test-83ae170092c8ec4d8a268d93438054e32493ee17.tar.xz
mrst-s0i3-test-83ae170092c8ec4d8a268d93438054e32493ee17.zip
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: ext4: clean up compiler warning in start_this_handle()
Diffstat (limited to 'fs')
-rw-r--r--fs/jbd2/transaction.c46
1 files changed, 27 insertions, 19 deletions
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index d95cc9d0401..f3479d6e0a8 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -82,6 +82,32 @@ jbd2_get_transaction(journal_t *journal, transaction_t *transaction)
*/
/*
+ * Update transiaction'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
+ * run in parallel on SMP systems, which limits our scalability. So
+ * unless debugging is enabled, we no longer update t_max_wait, which
+ * 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)
+{
+#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);
+ spin_lock(&transaction->t_handle_lock);
+ if (ts > transaction->t_max_wait)
+ transaction->t_max_wait = ts;
+ spin_unlock(&transaction->t_handle_lock);
+ }
+#endif
+}
+
+/*
* start_this_handle: Given a handle, deal with any locking or stalling
* needed to make sure that there is enough journal space for the handle
* to begin. Attach the handle to a transaction and set up the
@@ -95,7 +121,6 @@ static int start_this_handle(journal_t *journal, handle_t *handle,
int needed;
int nblocks = handle->h_buffer_credits;
transaction_t *new_transaction = NULL;
- unsigned long ts = jiffies;
if (nblocks > journal->j_max_transaction_buffers) {
printk(KERN_ERR "JBD: %s wants too many credits (%d > %d)\n",
@@ -241,25 +266,8 @@ repeat:
/* OK, account for the buffers that this operation expects to
* use and add the handle to the running transaction.
- *
- * 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 run in parallel on SMP
- * systems, which limits our scalability. So we only enable
- * it when debugging is enabled. We may want to use a
- * separate flag, eventually, so we can enable this
- * independently of debugging.
*/
-#ifdef CONFIG_JBD2_DEBUG
- if (jbd2_journal_enable_debug &&
- time_after(transaction->t_start, ts)) {
- ts = jbd2_time_diff(ts, transaction->t_start);
- spin_lock(&transaction->t_handle_lock);
- if (ts > transaction->t_max_wait)
- transaction->t_max_wait = ts;
- spin_unlock(&transaction->t_handle_lock);
- }
-#endif
+ update_t_max_wait(transaction);
handle->h_transaction = transaction;
atomic_inc(&transaction->t_updates);
atomic_inc(&transaction->t_handle_count);