hugetlb: hugepage migration core

[platform/adaptation/renesas_rcar/renesas_kernel.git] / fs / hugetlbfs / inode.c

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 6e5bd42..1f7ca50 100644 (file)
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -31,6 +31,7 @@
 #include <linux/statfs.h>
 #include <linux/security.h>
 #include <linux/magic.h>
+#include <linux/migrate.h>
 
 #include <asm/uaccess.h>
 
@@ -573,6 +574,19 @@ static int hugetlbfs_set_page_dirty(struct page *page)
        return 0;
 }
 
+static int hugetlbfs_migrate_page(struct address_space *mapping,
+                               struct page *newpage, struct page *page)
+{
+       int rc;
+
+       rc = migrate_huge_page_move_mapping(mapping, newpage, page);
+       if (rc)
+               return rc;
+       migrate_page_copy(newpage, page);
+
+       return 0;
+}
+
 static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
        struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb);
@@ -659,6 +673,7 @@ static const struct address_space_operations hugetlbfs_aops = {
        .write_begin    = hugetlbfs_write_begin,
        .write_end      = hugetlbfs_write_end,
        .set_page_dirty = hugetlbfs_set_page_dirty,
+       .migratepage    = hugetlbfs_migrate_page,
 };