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jbd: check for error returned by kthread_create on creating journal thread 

If the thread failed to create the subsequent wait_event will hang forever.

This is likely to happen if kernel hits max_threads limit.

Will be critical for virtualization systems that limit the number of tasks
and kernel memory usage within the container.

(akpm: JBD should be converted fully to the kthread API: kthread_should_stop()
and kthread_stop()).

Cc: <linux-ext4@vger.kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Pavel Emelianov 2007-05-08 00:30:42 -07:00 committed by Linus Torvalds
parent ee6f958291
commit 97f0678467
2 changed files with 18 additions and 8 deletions
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13
fs/jbd/journal.c
View File

@ -210,10 +210,16 @@ end_loop:
return 0;
}
static void journal_start_thread(journal_t *journal)
static int journal_start_thread(journal_t *journal)
{
kthread_run(kjournald, journal, "kjournald");
struct task_struct *t;
t = kthread_run(kjournald, journal, "kjournald");
if (IS_ERR(t))
return PTR_ERR(t);
wait_event(journal->j_wait_done_commit, journal->j_task != 0);
return 0;
}
static void journal_kill_thread(journal_t *journal)
@ -839,8 +845,7 @@ static int journal_reset(journal_t *journal)
/* Add the dynamic fields and write it to disk. */
journal_update_superblock(journal, 1);
journal_start_thread(journal);
return 0;
return journal_start_thread(journal);
}
/**

13
fs/jbd2/journal.c
View File

@ -210,10 +210,16 @@ end_loop:
return 0;
}
static void jbd2_journal_start_thread(journal_t *journal)
static int jbd2_journal_start_thread(journal_t *journal)
{
kthread_run(kjournald2, journal, "kjournald2");
struct task_struct *t;
t = kthread_run(kjournald2, journal, "kjournald2");
if (IS_ERR(t))
return PTR_ERR(t);
wait_event(journal->j_wait_done_commit, journal->j_task != 0);
return 0;
}
static void journal_kill_thread(journal_t *journal)
@ -839,8 +845,7 @@ static int journal_reset(journal_t *journal)
/* Add the dynamic fields and write it to disk. */
jbd2_journal_update_superblock(journal, 1);
jbd2_journal_start_thread(journal);
return 0;
return jbd2_journal_start_thread(journal);
}
/**