mm: split swap_type_of

[platform/kernel/linux-starfive.git] / mm / swapfile.c

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 7438c4a..b90f869 100644 (file)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1801,13 +1801,12 @@ int free_swap_and_cache(swp_entry_t entry)
  *
  * This is needed for the suspend to disk (aka swsusp).
  */
-int swap_type_of(dev_t device, sector_t offset, struct block_device **bdev_p)
+int swap_type_of(dev_t device, sector_t offset)
 {
-       struct block_device *bdev = NULL;
        int type;
 
-       if (device)
-               bdev = bdget(device);
+       if (!device)
+               return -1;
 
        spin_lock(&swap_lock);
        for (type = 0; type < nr_swapfiles; type++) {
@@ -1816,30 +1815,34 @@ int swap_type_of(dev_t device, sector_t offset, struct block_device **bdev_p)
                if (!(sis->flags & SWP_WRITEOK))
                        continue;
 
-               if (!bdev) {
-                       if (bdev_p)
-                               *bdev_p = bdgrab(sis->bdev);
-
-                       spin_unlock(&swap_lock);
-                       return type;
-               }
-               if (bdev == sis->bdev) {
+               if (device == sis->bdev->bd_dev) {
                        struct swap_extent *se = first_se(sis);
 
                        if (se->start_block == offset) {
-                               if (bdev_p)
-                                       *bdev_p = bdgrab(sis->bdev);
-
                                spin_unlock(&swap_lock);
-                               bdput(bdev);
                                return type;
                        }
                }
        }
        spin_unlock(&swap_lock);
-       if (bdev)
-               bdput(bdev);
+       return -ENODEV;
+}
 
+int find_first_swap(dev_t *device)
+{
+       int type;
+
+       spin_lock(&swap_lock);
+       for (type = 0; type < nr_swapfiles; type++) {
+               struct swap_info_struct *sis = swap_info[type];
+
+               if (!(sis->flags & SWP_WRITEOK))
+                       continue;
+               *device = sis->bdev->bd_dev;
+               spin_unlock(&swap_lock);
+               return type;
+       }
+       spin_unlock(&swap_lock);
        return -ENODEV;
 }