Merge branch 'rtc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip...

[mv-sheeva.git] / drivers / md / dm.c

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index f48a2f359ac473ccec8b46991f9269ebdf6fc5af..eaa3af0e0632af0c96c5c17566024265578e2303 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -32,7 +32,6 @@
 #define DM_COOKIE_ENV_VAR_NAME "DM_COOKIE"
 #define DM_COOKIE_LENGTH 24
 
-static DEFINE_MUTEX(dm_mutex);
 static const char *_name = DM_NAME;
 
 static unsigned int major = 0;
@@ -328,7 +327,6 @@ static int dm_blk_open(struct block_device *bdev, fmode_t mode)
 {
        struct mapped_device *md;
 
-       mutex_lock(&dm_mutex);
        spin_lock(&_minor_lock);
 
        md = bdev->bd_disk->private_data;
@@ -346,7 +344,6 @@ static int dm_blk_open(struct block_device *bdev, fmode_t mode)
 
 out:
        spin_unlock(&_minor_lock);
-       mutex_unlock(&dm_mutex);
 
        return md ? 0 : -ENXIO;
 }
@@ -355,10 +352,12 @@ static int dm_blk_close(struct gendisk *disk, fmode_t mode)
 {
        struct mapped_device *md = disk->private_data;
 
-       mutex_lock(&dm_mutex);
+       spin_lock(&_minor_lock);
+
        atomic_dec(&md->open_count);
        dm_put(md);
-       mutex_unlock(&dm_mutex);
+
+       spin_unlock(&_minor_lock);
 
        return 0;
 }
@@ -1638,13 +1637,15 @@ static void dm_request_fn(struct request_queue *q)
                if (map_request(ti, clone, md))
                        goto requeued;
 
-               spin_lock_irq(q->queue_lock);
+               BUG_ON(!irqs_disabled());
+               spin_lock(q->queue_lock);
        }
 
        goto out;
 
 requeued:
-       spin_lock_irq(q->queue_lock);
+       BUG_ON(!irqs_disabled());
+       spin_lock(q->queue_lock);
 
 plug_and_out:
        if (!elv_queue_empty(q))
@@ -1884,7 +1885,8 @@ static struct mapped_device *alloc_dev(int minor)
        add_disk(md->disk);
        format_dev_t(md->name, MKDEV(_major, minor));
 
-       md->wq = create_singlethread_workqueue("kdmflush");
+       md->wq = alloc_workqueue("kdmflush",
+                                WQ_NON_REENTRANT | WQ_MEM_RECLAIM, 0);
        if (!md->wq)
                goto bad_thread;
 
@@ -1992,13 +1994,14 @@ static void event_callback(void *context)
        wake_up(&md->eventq);
 }
 
+/*
+ * Protected by md->suspend_lock obtained by dm_swap_table().
+ */
 static void __set_size(struct mapped_device *md, sector_t size)
 {
        set_capacity(md->disk, size);
 
-       mutex_lock(&md->bdev->bd_inode->i_mutex);
        i_size_write(md->bdev->bd_inode, (loff_t)size << SECTOR_SHIFT);
-       mutex_unlock(&md->bdev->bd_inode->i_mutex);
 }
 
 /*