diff options
Diffstat (limited to 'mm/backing-dev.c')
| -rw-r--r-- | mm/backing-dev.c | 31 |
1 files changed, 10 insertions, 21 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index dbc66815a0f..672c17bb32d 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -331,7 +331,7 @@ static int bdi_forker_thread(void *ptr) for (;;) { bool fork = false; struct task_struct *task; - struct backing_dev_info *bdi, *tmp; + struct backing_dev_info *bdi; /* * Temporary measure, we want to make sure we don't see @@ -347,7 +347,7 @@ static int bdi_forker_thread(void *ptr) * Check if any existing bdi's have dirty data without * a thread registered. If so, set that up. */ - list_for_each_entry_safe(bdi, tmp, &bdi_list, bdi_list) { + list_for_each_entry(bdi, &bdi_list, bdi_list) { if (!bdi_cap_writeback_dirty(bdi)) continue; if (bdi->wb.task) @@ -359,8 +359,13 @@ static int bdi_forker_thread(void *ptr) WARN(!test_bit(BDI_registered, &bdi->state), "bdi %p/%s is not registered!\n", bdi, bdi->name); - list_del_rcu(&bdi->bdi_list); fork = true; + + /* + * Set the pending bit - if someone will try to + * unregister this bdi - it'll wait on this bit. + */ + set_bit(BDI_pending, &bdi->state); break; } spin_unlock_bh(&bdi_lock); @@ -383,29 +388,13 @@ static int bdi_forker_thread(void *ptr) __set_current_state(TASK_RUNNING); - /* - * Set the pending bit - if someone will try to unregister this - * bdi - it'll wait on this bit. - */ - set_bit(BDI_pending, &bdi->state); - - /* Make sure no one uses the picked bdi */ - synchronize_rcu(); - task = kthread_run(bdi_writeback_thread, &bdi->wb, "flush-%s", dev_name(bdi->dev)); if (IS_ERR(task)) { /* - * If thread creation fails, then readd the bdi back to - * the list and force writeout of the bdi from this - * forker thread. That will free some memory and we can - * try again. Add it to the tail so we get a chance to - * flush other bdi's to free memory. + * If thread creation fails, force writeout of the bdi + * from the thread. */ - spin_lock_bh(&bdi_lock); - list_add_tail_rcu(&bdi->bdi_list, &bdi_list); - spin_unlock_bh(&bdi_lock); - bdi_flush_io(bdi); } else bdi->wb.task = task; |