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[PATCH] page migration cleanup: group functions 

Reorder functions in migrate.c.  Group all migration functions for struct
address_space_operations together.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter 2006-06-23 02:03:28 -07:00 committed by Linus Torvalds
parent 7352349a19
commit 1d8b85ccf1
1 changed files with 72 additions and 70 deletions
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142
mm/migrate.c
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@ -119,15 +119,6 @@ int putback_lru_pages(struct list_head *l)
return count;
}
/*
* Non migratable page
*/
int fail_migrate_page(struct page *newpage, struct page *page)
{
return -EIO;
}
EXPORT_SYMBOL(fail_migrate_page);
/*
* swapout a single page
* page is locked upon entry, unlocked on exit
@ -297,6 +288,17 @@ void migrate_page_copy(struct page *newpage, struct page *page)
}
EXPORT_SYMBOL(migrate_page_copy);
/************************************************************
* Migration functions
***********************************************************/
/* Always fail migration. Used for mappings that are not movable */
int fail_migrate_page(struct page *newpage, struct page *page)
{
return -EIO;
}
EXPORT_SYMBOL(fail_migrate_page);
/*
* Common logic to directly migrate a single page suitable for
* pages that do not use PagePrivate.
@ -329,6 +331,67 @@ int migrate_page(struct page *newpage, struct page *page)
}
EXPORT_SYMBOL(migrate_page);
/*
* Migration function for pages with buffers. This function can only be used
* if the underlying filesystem guarantees that no other references to "page"
* exist.
*/
int buffer_migrate_page(struct page *newpage, struct page *page)
{
struct address_space *mapping = page->mapping;
struct buffer_head *bh, *head;
int rc;
if (!mapping)
return -EAGAIN;
if (!page_has_buffers(page))
return migrate_page(newpage, page);
head = page_buffers(page);
rc = migrate_page_remove_references(newpage, page, 3);
if (rc)
return rc;
bh = head;
do {
get_bh(bh);
lock_buffer(bh);
bh = bh->b_this_page;
} while (bh != head);
ClearPagePrivate(page);
set_page_private(newpage, page_private(page));
set_page_private(page, 0);
put_page(page);
get_page(newpage);
bh = head;
do {
set_bh_page(bh, newpage, bh_offset(bh));
bh = bh->b_this_page;
} while (bh != head);
SetPagePrivate(newpage);
migrate_page_copy(newpage, page);
bh = head;
do {
unlock_buffer(bh);
put_bh(bh);
bh = bh->b_this_page;
} while (bh != head);
return 0;
}
EXPORT_SYMBOL(buffer_migrate_page);
/*
* migrate_pages
*
@ -528,67 +591,6 @@ next:
return nr_failed + retry;
}
/*
* Migration function for pages with buffers. This function can only be used
* if the underlying filesystem guarantees that no other references to "page"
* exist.
*/
int buffer_migrate_page(struct page *newpage, struct page *page)
{
struct address_space *mapping = page->mapping;
struct buffer_head *bh, *head;
int rc;
if (!mapping)
return -EAGAIN;
if (!page_has_buffers(page))
return migrate_page(newpage, page);
head = page_buffers(page);
rc = migrate_page_remove_references(newpage, page, 3);
if (rc)
return rc;
bh = head;
do {
get_bh(bh);
lock_buffer(bh);
bh = bh->b_this_page;
} while (bh != head);
ClearPagePrivate(page);
set_page_private(newpage, page_private(page));
set_page_private(page, 0);
put_page(page);
get_page(newpage);
bh = head;
do {
set_bh_page(bh, newpage, bh_offset(bh));
bh = bh->b_this_page;
} while (bh != head);
SetPagePrivate(newpage);
migrate_page_copy(newpage, page);
bh = head;
do {
unlock_buffer(bh);
put_bh(bh);
bh = bh->b_this_page;
} while (bh != head);
return 0;
}
EXPORT_SYMBOL(buffer_migrate_page);
/*
* Migrate the list 'pagelist' of pages to a certain destination.
*