blob: 5ec2551e773bf4282e13ca36d84a4a055d07f226 (
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--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1287,6 +1287,8 @@ struct block_device_operations {
unsigned long long);
int (*revalidate_disk) (struct gendisk *);
int (*getgeo)(struct block_device *, struct hd_geometry *);
+ /* this callback is with swap_lock and sometimes page table lock held */
+ void (*swap_slot_free_notify) (struct block_device *, unsigned long);
struct module *owner;
};
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -574,6 +574,7 @@ static unsigned char swap_entry_free(str
/* free if no reference */
if (!usage) {
+ struct gendisk *disk = p->bdev->bd_disk;
if (offset < p->lowest_bit)
p->lowest_bit = offset;
if (offset > p->highest_bit)
@@ -583,6 +584,8 @@ static unsigned char swap_entry_free(str
swap_list.next = p->type;
nr_swap_pages++;
p->inuse_pages--;
+ if (disk->fops->swap_slot_free_notify)
+ disk->fops->swap_slot_free_notify(p->bdev, offset);
}
return usage;
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