From 55c0c4ac0be144014651b19e77c9b77f367955de Mon Sep 17 00:00:00 2001 From: Bob Peterson Date: Fri, 14 Sep 2007 09:27:59 -0500 Subject: [GFS2] GFS2: chmod hung - fix race in thread creation The problem boiled down to a race between the gdlm_init_threads() function initializing thread1 and its setting of blist = 1. Essentially, "if (current == ls->thread1)" was checked by the thread before the thread creator set ls->thread1. Since thread1 is the only thread who is allowed to work on the blocking queue, and since neither thread thought it was thread1, no one was working on the queue. So everything just sat. This patch reuses the ls->async_lock spin_lock to fix the race, and it fixes the problem. I've done more than 2000 iterations of the loop that was recreating the failure and it seems to work. Signed-off-by: Bob Peterson Signed-off-by: Steven Whitehouse -- --- fs/gfs2/locking/dlm/thread.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) (limited to 'fs/gfs2') diff --git a/fs/gfs2/locking/dlm/thread.c b/fs/gfs2/locking/dlm/thread.c index 1aca51e..bd938f0 100644 --- a/fs/gfs2/locking/dlm/thread.c +++ b/fs/gfs2/locking/dlm/thread.c @@ -268,20 +268,16 @@ static inline int check_drop(struct gdlm_ls *ls) return 0; } -static int gdlm_thread(void *data) +static int gdlm_thread(void *data, int blist) { struct gdlm_ls *ls = (struct gdlm_ls *) data; struct gdlm_lock *lp = NULL; - int blist = 0; uint8_t complete, blocking, submit, drop; DECLARE_WAITQUEUE(wait, current); /* Only thread1 is allowed to do blocking callbacks since gfs may wait for a completion callback within a blocking cb. */ - if (current == ls->thread1) - blist = 1; - while (!kthread_should_stop()) { set_current_state(TASK_INTERRUPTIBLE); add_wait_queue(&ls->thread_wait, &wait); @@ -333,12 +329,22 @@ static int gdlm_thread(void *data) return 0; } +static int gdlm_thread1(void *data) +{ + return gdlm_thread(data, 1); +} + +static int gdlm_thread2(void *data) +{ + return gdlm_thread(data, 0); +} + int gdlm_init_threads(struct gdlm_ls *ls) { struct task_struct *p; int error; - p = kthread_run(gdlm_thread, ls, "lock_dlm1"); + p = kthread_run(gdlm_thread1, ls, "lock_dlm1"); error = IS_ERR(p); if (error) { log_error("can't start lock_dlm1 thread %d", error); @@ -346,7 +352,7 @@ int gdlm_init_threads(struct gdlm_ls *ls) } ls->thread1 = p; - p = kthread_run(gdlm_thread, ls, "lock_dlm2"); + p = kthread_run(gdlm_thread2, ls, "lock_dlm2"); error = IS_ERR(p); if (error) { log_error("can't start lock_dlm2 thread %d", error); -- cgit v1.1