[SCSI] zfcp: return early from slave_destroy if slave_alloc returned early

[pandora-kernel.git] / drivers / md / dm.c

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 52b39f3..4720f68 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -25,6 +25,16 @@
 
 #define DM_MSG_PREFIX "core"
 
+#ifdef CONFIG_PRINTK
+/*
+ * ratelimit state to be used in DMXXX_LIMIT().
+ */
+DEFINE_RATELIMIT_STATE(dm_ratelimit_state,
+                      DEFAULT_RATELIMIT_INTERVAL,
+                      DEFAULT_RATELIMIT_BURST);
+EXPORT_SYMBOL(dm_ratelimit_state);
+#endif
+
 /*
  * Cookies are numeric values sent with CHANGE and REMOVE
  * uevents while resuming, removing or renaming the device.
@@ -130,6 +140,8 @@ struct mapped_device {
        /* Protect queue and type against concurrent access. */
        struct mutex type_lock;
 
+       struct target_type *immutable_target_type;
+
        struct gendisk *disk;
        char name[16];
 
@@ -180,9 +192,6 @@ struct mapped_device {
        /* forced geometry settings */
        struct hd_geometry geometry;
 
-       /* For saving the address of __make_request for request based dm */
-       make_request_fn *saved_make_request_fn;
-
        /* sysfs handle */
        struct kobject kobj;
 
@@ -1391,7 +1400,7 @@ out:
  * The request function that just remaps the bio built up by
  * dm_merge_bvec.
  */
-static int _dm_request(struct request_queue *q, struct bio *bio)
+static void _dm_request(struct request_queue *q, struct bio *bio)
 {
        int rw = bio_data_dir(bio);
        struct mapped_device *md = q->queuedata;
@@ -1412,19 +1421,12 @@ static int _dm_request(struct request_queue *q, struct bio *bio)
                        queue_io(md, bio);
                else
                        bio_io_error(bio);
-               return 0;
+               return;
        }
 
        __split_and_process_bio(md, bio);
        up_read(&md->io_lock);
-       return 0;
-}
-
-static int dm_make_request(struct request_queue *q, struct bio *bio)
-{
-       struct mapped_device *md = q->queuedata;
-
-       return md->saved_make_request_fn(q, bio); /* call __make_request() */
+       return;
 }
 
 static int dm_request_based(struct mapped_device *md)
@@ -1432,14 +1434,14 @@ static int dm_request_based(struct mapped_device *md)
        return blk_queue_stackable(md->queue);
 }
 
-static int dm_request(struct request_queue *q, struct bio *bio)
+static void dm_request(struct request_queue *q, struct bio *bio)
 {
        struct mapped_device *md = q->queuedata;
 
        if (dm_request_based(md))
-               return dm_make_request(q, bio);
-
-       return _dm_request(q, bio);
+               blk_queue_bio(q, bio);
+       else
+               _dm_request(q, bio);
 }
 
 void dm_dispatch_request(struct request *rq)
@@ -2086,6 +2088,8 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t,
        write_lock_irqsave(&md->map_lock, flags);
        old_map = md->map;
        md->map = t;
+       md->immutable_target_type = dm_table_get_immutable_target_type(t);
+
        dm_table_set_restrictions(t, q, limits);
        if (merge_is_optional)
                set_bit(DMF_MERGE_IS_OPTIONAL, &md->flags);
@@ -2156,6 +2160,11 @@ unsigned dm_get_md_type(struct mapped_device *md)
        return md->type;
 }
 
+struct target_type *dm_get_immutable_target_type(struct mapped_device *md)
+{
+       return md->immutable_target_type;
+}
+
 /*
  * Fully initialize a request-based queue (->elevator, ->request_fn, etc).
  */
@@ -2172,7 +2181,6 @@ static int dm_init_request_based_queue(struct mapped_device *md)
                return 0;
 
        md->queue = q;
-       md->saved_make_request_fn = md->queue->make_request_fn;
        dm_init_md_queue(md);
        blk_queue_softirq_done(md->queue, dm_softirq_done);
        blk_queue_prep_rq(md->queue, dm_prep_fn);
@@ -2231,6 +2239,7 @@ struct mapped_device *dm_get_md(dev_t dev)
 
        return md;
 }
+EXPORT_SYMBOL_GPL(dm_get_md);
 
 void *dm_get_mdptr(struct mapped_device *md)
 {
@@ -2316,7 +2325,6 @@ static int dm_wait_for_completion(struct mapped_device *md, int interruptible)
        while (1) {
                set_current_state(interruptible);
 
-               smp_mb();
                if (!md_in_flight(md))
                        break;