drm/i915: quirk invert brightness for Acer Aspire 5336

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

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index bc04518..5c52582 100644 (file)
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -54,7 +54,9 @@ struct dm_table {
        sector_t *highs;
        struct dm_target *targets;
 
+       struct target_type *immutable_target_type;
        unsigned integrity_supported:1;
+       unsigned singleton:1;
 
        /*
         * Indicates the rw permissions for the new logical
@@ -213,6 +215,11 @@ int dm_table_create(struct dm_table **result, fmode_t mode,
 
        num_targets = dm_round_up(num_targets, KEYS_PER_NODE);
 
+       if (!num_targets) {
+               kfree(t);
+               return -ENOMEM;
+       }
+
        if (alloc_targets(t, num_targets)) {
                kfree(t);
                t = NULL;
@@ -579,14 +586,28 @@ static int adjoin(struct dm_table *table, struct dm_target *ti)
 
 /*
  * Used to dynamically allocate the arg array.
+ *
+ * We do first allocation with GFP_NOIO because dm-mpath and dm-thin must
+ * process messages even if some device is suspended. These messages have a
+ * small fixed number of arguments.
+ *
+ * On the other hand, dm-switch needs to process bulk data using messages and
+ * excessive use of GFP_NOIO could cause trouble.
  */
 static char **realloc_argv(unsigned *array_size, char **old_argv)
 {
        char **argv;
        unsigned new_size;
+       gfp_t gfp;
 
-       new_size = *array_size ? *array_size * 2 : 64;
-       argv = kmalloc(new_size * sizeof(*argv), GFP_KERNEL);
+       if (*array_size) {
+               new_size = *array_size * 2;
+               gfp = GFP_KERNEL;
+       } else {
+               new_size = 8;
+               gfp = GFP_NOIO;
+       }
+       argv = kmalloc(new_size * sizeof(*argv), gfp);
        if (argv) {
                memcpy(argv, old_argv, *array_size * sizeof(*argv));
                *array_size = new_size;
@@ -740,6 +761,12 @@ int dm_table_add_target(struct dm_table *t, const char *type,
        char **argv;
        struct dm_target *tgt;
 
+       if (t->singleton) {
+               DMERR("%s: target type %s must appear alone in table",
+                     dm_device_name(t->md), t->targets->type->name);
+               return -EINVAL;
+       }
+
        if ((r = check_space(t)))
                return r;
 
@@ -758,6 +785,36 @@ int dm_table_add_target(struct dm_table *t, const char *type,
                return -EINVAL;
        }
 
+       if (dm_target_needs_singleton(tgt->type)) {
+               if (t->num_targets) {
+                       DMERR("%s: target type %s must appear alone in table",
+                             dm_device_name(t->md), type);
+                       return -EINVAL;
+               }
+               t->singleton = 1;
+       }
+
+       if (dm_target_always_writeable(tgt->type) && !(t->mode & FMODE_WRITE)) {
+               DMERR("%s: target type %s may not be included in read-only tables",
+                     dm_device_name(t->md), type);
+               return -EINVAL;
+       }
+
+       if (t->immutable_target_type) {
+               if (t->immutable_target_type != tgt->type) {
+                       DMERR("%s: immutable target type %s cannot be mixed with other target types",
+                             dm_device_name(t->md), t->immutable_target_type->name);
+                       return -EINVAL;
+               }
+       } else if (dm_target_is_immutable(tgt->type)) {
+               if (t->num_targets) {
+                       DMERR("%s: immutable target type %s cannot be mixed with other target types",
+                             dm_device_name(t->md), tgt->type->name);
+                       return -EINVAL;
+               }
+               t->immutable_target_type = tgt->type;
+       }
+
        tgt->table = t;
        tgt->begin = start;
        tgt->len = len;
@@ -915,6 +972,11 @@ unsigned dm_table_get_type(struct dm_table *t)
        return t->type;
 }
 
+struct target_type *dm_table_get_immutable_target_type(struct dm_table *t)
+{
+       return t->immutable_target_type;
+}
+
 bool dm_table_request_based(struct dm_table *t)
 {
        return dm_table_get_type(t) == DM_TYPE_REQUEST_BASED;
@@ -1299,6 +1361,39 @@ static bool dm_table_discard_zeroes_data(struct dm_table *t)
        return 1;
 }
 
+static int device_is_nonrot(struct dm_target *ti, struct dm_dev *dev,
+                           sector_t start, sector_t len, void *data)
+{
+       struct request_queue *q = bdev_get_queue(dev->bdev);
+
+       return q && blk_queue_nonrot(q);
+}
+
+static int device_is_not_random(struct dm_target *ti, struct dm_dev *dev,
+                            sector_t start, sector_t len, void *data)
+{
+       struct request_queue *q = bdev_get_queue(dev->bdev);
+
+       return q && !blk_queue_add_random(q);
+}
+
+static bool dm_table_all_devices_attribute(struct dm_table *t,
+                                          iterate_devices_callout_fn func)
+{
+       struct dm_target *ti;
+       unsigned i = 0;
+
+       while (i < dm_table_get_num_targets(t)) {
+               ti = dm_table_get_target(t, i++);
+
+               if (!ti->type->iterate_devices ||
+                   !ti->type->iterate_devices(ti, func, NULL))
+                       return 0;
+       }
+
+       return 1;
+}
+
 void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
                               struct queue_limits *limits)
 {
@@ -1324,8 +1419,23 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
        if (!dm_table_discard_zeroes_data(t))
                q->limits.discard_zeroes_data = 0;
 
+       /* Ensure that all underlying devices are non-rotational. */
+       if (dm_table_all_devices_attribute(t, device_is_nonrot))
+               queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
+       else
+               queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, q);
+
        dm_table_set_integrity(t);
 
+       /*
+        * Determine whether or not this queue's I/O timings contribute
+        * to the entropy pool, Only request-based targets use this.
+        * Clear QUEUE_FLAG_ADD_RANDOM if any underlying device does not
+        * have it set.
+        */
+       if (blk_queue_add_random(q) && dm_table_all_devices_attribute(t, device_is_not_random))
+               queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q);
+
        /*
         * QUEUE_FLAG_STACKABLE must be set after all queue settings are
         * visible to other CPUs because, once the flag is set, incoming bios