[PATCH] page migration cleanup: pass "mapping" to migration functions
Change handling of address spaces.
Pass a pointer to the address space in which the page is migrated to all
migration function. This avoids repeatedly having to retrieve the address
space pointer from the page and checking it for validity. The old page
mapping will change once migration has gone to a certain step, so it is less
confusing to have the pointer always available.
Move the setting of the mapping and index for the new page into
migrate_pages().
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/linux/fs.h b/include/linux/fs.h
index c823a38..e917403 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -376,7 +376,8 @@
struct page* (*get_xip_page)(struct address_space *, sector_t,
int);
/* migrate the contents of a page to the specified target */
- int (*migratepage) (struct page *, struct page *);
+ int (*migratepage) (struct address_space *,
+ struct page *, struct page *);
};
struct backing_dev_info;
@@ -1772,7 +1773,8 @@
extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t);
#ifdef CONFIG_MIGRATION
-extern int buffer_migrate_page(struct page *, struct page *);
+extern int buffer_migrate_page(struct address_space *,
+ struct page *, struct page *);
#else
#define buffer_migrate_page NULL
#endif