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bcachefs: Make sure to initialize j->last_flushed

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If the journal reclaim thread makes it to the timeout without ever
initializing j->last_flushed, we could end up sleeping for a very long
time.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2021-04-28 22:12:07 -04:00 committed by Kent Overstreet
parent 050197b1c1
commit 2ce867df31
4 changed files with 20 additions and 11 deletions
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4
fs/bcachefs/journal.c
View file

@ -1189,6 +1189,8 @@ void __bch2_journal_debug_to_text(struct printbuf *out, struct journal *j)
"nr noflush writes:\t%llu\n"
"nr direct reclaim:\t%llu\n"
"nr background reclaim:\t%llu\n"
"reclaim kicked:\t\t%u\n"
"reclaim runs in:\t%u ms\n"
"current entry sectors:\t%u\n"
"current entry error:\t%u\n"
"current entry:\t\t",
@ -1204,6 +1206,8 @@ void __bch2_journal_debug_to_text(struct printbuf *out, struct journal *j)
j->nr_noflush_writes,
j->nr_direct_reclaim,
j->nr_background_reclaim,
j->reclaim_kicked,
jiffies_to_msecs(j->next_reclaim - jiffies),
j->cur_entry_sectors,
j->cur_entry_error);

18
fs/bcachefs/journal_reclaim.c
View file

@ -677,13 +677,15 @@ int bch2_journal_reclaim(struct journal *j)
static int bch2_journal_reclaim_thread(void *arg)
{
struct journal *j = arg;
unsigned long next;
unsigned long delay, now;
int ret = 0;
set_freezable();
kthread_wait_freezable(test_bit(JOURNAL_RECLAIM_STARTED, &j->flags));
j->last_flushed = jiffies;
while (!ret && !kthread_should_stop()) {
j->reclaim_kicked = false;
@ -691,18 +693,22 @@ static int bch2_journal_reclaim_thread(void *arg)
ret = __bch2_journal_reclaim(j, false);
mutex_unlock(&j->reclaim_lock);
next = j->last_flushed + msecs_to_jiffies(j->reclaim_delay_ms);
now = jiffies;
delay = msecs_to_jiffies(j->reclaim_delay_ms);
j->next_reclaim = j->last_flushed + delay;
if (!time_in_range(j->next_reclaim, now, now + delay))
j->next_reclaim = now + delay;
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
if (kthread_should_stop())
break;
if (j->reclaim_kicked)
break;
if (time_after_eq(jiffies, next))
if (time_after_eq(jiffies, j->next_reclaim))
break;
schedule_timeout(next - jiffies);
try_to_freeze();
schedule_timeout(j->next_reclaim - jiffies);
}
__set_current_state(TASK_RUNNING);

8
fs/bcachefs/journal_reclaim.h
View file

@ -8,11 +8,9 @@ static inline void journal_reclaim_kick(struct journal *j)
{
struct task_struct *p = READ_ONCE(j->reclaim_thread);
if (p && !j->reclaim_kicked) {
j->reclaim_kicked = true;
if (p)
wake_up_process(p);
}
j->reclaim_kicked = true;
if (p)
wake_up_process(p);
}
unsigned bch2_journal_dev_buckets_available(struct journal *,

1
fs/bcachefs/journal_types.h
View file

@ -248,6 +248,7 @@ struct journal {
wait_queue_head_t reclaim_wait;
struct task_struct *reclaim_thread;
bool reclaim_kicked;
unsigned long next_reclaim;
u64 nr_direct_reclaim;
u64 nr_background_reclaim;