diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/bitmap.c | 115 |
1 files changed, 8 insertions, 107 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c index f8ffaee20ff..814f412a410 100644 --- a/drivers/md/bitmap.c +++ b/drivers/md/bitmap.c @@ -7,7 +7,6 @@ * additions, Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.: * - added disk storage for bitmap * - changes to allow various bitmap chunk sizes - * - added bitmap daemon (to asynchronously clear bitmap bits from disk) */ /* @@ -330,14 +329,13 @@ static int write_page(struct bitmap *bitmap, struct page *page, int wait) set_page_dirty(page); /* force it to be written out */ if (!wait) { - /* add to list to be waited for by daemon */ + /* add to list to be waited for */ struct page_list *item = mempool_alloc(bitmap->write_pool, GFP_NOIO); item->page = page; get_page(page); spin_lock(&bitmap->write_lock); list_add(&item->list, &bitmap->complete_pages); spin_unlock(&bitmap->write_lock); - md_wakeup_thread(bitmap->writeback_daemon); } return write_one_page(page, wait); } @@ -621,8 +619,6 @@ static void bitmap_file_unmap(struct bitmap *bitmap) safe_put_page(sb_page); } -static void bitmap_stop_daemon(struct bitmap *bitmap); - /* dequeue the next item in a page list -- don't call from irq context */ static struct page_list *dequeue_page(struct bitmap *bitmap) { @@ -648,8 +644,6 @@ static void drain_write_queues(struct bitmap *bitmap) put_page(item->page); mempool_free(item, bitmap->write_pool); } - - wake_up(&bitmap->write_wait); } static void bitmap_file_put(struct bitmap *bitmap) @@ -663,8 +657,6 @@ static void bitmap_file_put(struct bitmap *bitmap) bitmap->file = NULL; spin_unlock_irqrestore(&bitmap->lock, flags); - bitmap_stop_daemon(bitmap); - drain_write_queues(bitmap); bitmap_file_unmap(bitmap); @@ -770,6 +762,8 @@ static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) } +static void bitmap_writeback(struct bitmap *bitmap); + /* this gets called when the md device is ready to unplug its underlying * (slave) device queues -- before we let any writes go down, we need to * sync the dirty pages of the bitmap file to disk */ @@ -812,13 +806,9 @@ int bitmap_unplug(struct bitmap *bitmap) } } if (wait) { /* if any writes were performed, we need to wait on them */ - if (bitmap->file) { - spin_lock_irq(&bitmap->write_lock); - wait_event_lock_irq(bitmap->write_wait, - list_empty(&bitmap->complete_pages), bitmap->write_lock, - wake_up_process(bitmap->writeback_daemon->tsk)); - spin_unlock_irq(&bitmap->write_lock); - } else + if (bitmap->file) + bitmap_writeback(bitmap); + else md_super_wait(bitmap->mddev); } return 0; @@ -1126,41 +1116,12 @@ int bitmap_daemon_work(struct bitmap *bitmap) return err; } -static void daemon_exit(struct bitmap *bitmap, mdk_thread_t **daemon) +static void bitmap_writeback(struct bitmap *bitmap) { - mdk_thread_t *dmn; - unsigned long flags; - - /* if no one is waiting on us, we'll free the md thread struct - * and exit, otherwise we let the waiter clean things up */ - spin_lock_irqsave(&bitmap->lock, flags); - if ((dmn = *daemon)) { /* no one is waiting, cleanup and exit */ - *daemon = NULL; - spin_unlock_irqrestore(&bitmap->lock, flags); - kfree(dmn); - complete_and_exit(NULL, 0); /* do_exit not exported */ - } - spin_unlock_irqrestore(&bitmap->lock, flags); -} - -static void bitmap_writeback_daemon(mddev_t *mddev) -{ - struct bitmap *bitmap = mddev->bitmap; struct page *page; struct page_list *item; int err = 0; - if (signal_pending(current)) { - printk(KERN_INFO - "%s: bitmap writeback daemon got signal, exiting...\n", - bmname(bitmap)); - err = -EINTR; - goto out; - } - if (bitmap == NULL) - /* about to be stopped. */ - return; - PRINTK("%s: bitmap writeback daemon woke up...\n", bmname(bitmap)); /* wait on bitmap page writebacks */ while ((item = dequeue_page(bitmap))) { @@ -1177,59 +1138,9 @@ static void bitmap_writeback_daemon(mddev_t *mddev) "failed (page %lu): %d\n", bmname(bitmap), page->index, err); bitmap_file_kick(bitmap); - goto out; + break; } } - out: - wake_up(&bitmap->write_wait); - if (err) { - printk(KERN_INFO "%s: bitmap writeback daemon exiting (%d)\n", - bmname(bitmap), err); - daemon_exit(bitmap, &bitmap->writeback_daemon); - } -} - -static mdk_thread_t *bitmap_start_daemon(struct bitmap *bitmap, - void (*func)(mddev_t *), char *name) -{ - mdk_thread_t *daemon; - char namebuf[32]; - -#ifdef INJECT_FATAL_FAULT_2 - daemon = NULL; -#else - sprintf(namebuf, "%%s_%s", name); - daemon = md_register_thread(func, bitmap->mddev, namebuf); -#endif - if (!daemon) { - printk(KERN_ERR "%s: failed to start bitmap daemon\n", - bmname(bitmap)); - return ERR_PTR(-ECHILD); - } - - md_wakeup_thread(daemon); /* start it running */ - - PRINTK("%s: %s daemon (pid %d) started...\n", - bmname(bitmap), name, daemon->tsk->pid); - - return daemon; -} - -static void bitmap_stop_daemon(struct bitmap *bitmap) -{ - /* the daemon can't stop itself... it'll just exit instead... */ - if (bitmap->writeback_daemon && ! IS_ERR(bitmap->writeback_daemon) && - current->pid != bitmap->writeback_daemon->tsk->pid) { - mdk_thread_t *daemon; - unsigned long flags; - - spin_lock_irqsave(&bitmap->lock, flags); - daemon = bitmap->writeback_daemon; - bitmap->writeback_daemon = NULL; - spin_unlock_irqrestore(&bitmap->lock, flags); - if (daemon && ! IS_ERR(daemon)) - md_unregister_thread(daemon); /* destroy the thread */ - } } static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, @@ -1553,7 +1464,6 @@ int bitmap_create(mddev_t *mddev) spin_lock_init(&bitmap->write_lock); INIT_LIST_HEAD(&bitmap->complete_pages); - init_waitqueue_head(&bitmap->write_wait); bitmap->write_pool = mempool_create_kmalloc_pool(WRITE_POOL_SIZE, sizeof(struct page_list)); err = -ENOMEM; @@ -1613,15 +1523,6 @@ int bitmap_create(mddev_t *mddev) mddev->bitmap = bitmap; - if (file) - /* kick off the bitmap writeback daemon */ - bitmap->writeback_daemon = - bitmap_start_daemon(bitmap, - bitmap_writeback_daemon, - "bitmap_wb"); - - if (IS_ERR(bitmap->writeback_daemon)) - return PTR_ERR(bitmap->writeback_daemon); mddev->thread->timeout = bitmap->daemon_sleep * HZ; return bitmap_update_sb(bitmap); |