From 97f067846786d255888ccad14e2f38a1f63d8e9b Mon Sep 17 00:00:00 2001 From: Pavel Emelianov Date: Tue, 8 May 2007 00:30:42 -0700 Subject: 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: Cc: Christoph Hellwig Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/jbd/journal.c | 13 +++++++++---- fs/jbd2/journal.c | 13 +++++++++---- 2 files changed, 18 insertions(+), 8 deletions(-) diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c index e1eb7e999ae8..46fe7439fb91 100644 --- a/fs/jbd/journal.c +++ b/fs/jbd/journal.c @@ -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); } /** diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c index 6b3158ec9e2c..78d63b818f0b 100644 --- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -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); } /** -- cgit v1.2.3