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authorChristoph Lameter <clameter@sgi.com>2006-02-01 03:05:41 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-01 08:53:17 -0800
commite965f9630c651fa4249039fd4b80c9392d07a856 (patch)
tree1353dd536d0ee549c30e462086624c21788ee9d2 /include
parent7e2ab150d1b3b286a4c864c60a549b2601777b63 (diff)
downloadop-kernel-dev-e965f9630c651fa4249039fd4b80c9392d07a856.zip
op-kernel-dev-e965f9630c651fa4249039fd4b80c9392d07a856.tar.gz
[PATCH] Direct Migration V9: Avoid writeback / page_migrate() method
Migrate a page with buffers without requiring writeback This introduces a new address space operation migratepage() that may be used by a filesystem to implement its own version of page migration. A version is provided that migrates buffers attached to pages. Some filesystems (ext2, ext3, xfs) are modified to utilize this feature. The swapper address space operation are modified so that a regular migrate_page() will occur for anonymous pages without writeback (migrate_pages forces every anonymous page to have a swap entry). Signed-off-by: Mike Kravetz <kravetz@us.ibm.com> Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/fs.h8
-rw-r--r--include/linux/swap.h5
2 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 84bb449..e059da9 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -363,6 +363,8 @@ struct address_space_operations {
loff_t offset, unsigned long nr_segs);
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 *);
};
struct backing_dev_info;
@@ -1719,6 +1721,12 @@ extern void simple_release_fs(struct vfsmount **mount, int *count);
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 *);
+#else
+#define buffer_migrate_page NULL
+#endif
+
extern int inode_change_ok(struct inode *, struct iattr *);
extern int __must_check inode_setattr(struct inode *, struct iattr *);
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 229b6d0..f3e17d5 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -193,13 +193,18 @@ extern int isolate_lru_page(struct page *p);
extern int putback_lru_pages(struct list_head *l);
extern int migrate_page(struct page *, struct page *);
extern void migrate_page_copy(struct page *, struct page *);
+extern int migrate_page_remove_references(struct page *, struct page *, int);
extern int migrate_pages(struct list_head *l, struct list_head *t,
struct list_head *moved, struct list_head *failed);
+extern int fail_migrate_page(struct page *, struct page *);
#else
static inline int isolate_lru_page(struct page *p) { return -ENOSYS; }
static inline int putback_lru_pages(struct list_head *l) { return 0; }
static inline int migrate_pages(struct list_head *l, struct list_head *t,
struct list_head *moved, struct list_head *failed) { return -ENOSYS; }
+/* Possible settings for the migrate_page() method in address_operations */
+#define migrate_page NULL
+#define fail_migrate_page NULL
#endif
#ifdef CONFIG_MMU
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