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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2011-04-04 12:53:28 +0900
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2011-05-10 22:21:44 +0900
commit1cb2d38cb3e59d58e8321a0592e84b5761afb063 (patch)
tree151e7ffccd72f786a3da511b0f23906961835a22 /fs/nilfs2/page.c
parenteaae0f37d83bed7ccd0c6d0f52de1de44f92aecc (diff)
downloadlinux-1cb2d38cb3e59d58e8321a0592e84b5761afb063.tar.gz
nilfs2: get rid of private page allocator
Previously, nilfs was cloning pages for mmapped region to freeze their data and ensure consistency of checksum during writeback cycles. A private page allocator was used for this page cloning. But, we no longer need to do that since clear_page_dirty_for_io function sets up pte so that vm_ops->page_mkwrite function is called right before the mmapped pages are modified and nilfs_page_mkwrite function can safely wait for the pages to be written back to disk. So, this stops making a copy of mmapped pages during writeback, and eliminates the private page allocation and deallocation functions from nilfs. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/page.c')
-rw-r--r--fs/nilfs2/page.c53
1 files changed, 1 insertions, 52 deletions
diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c
index 1168059c7ef..b3b988c2018 100644
--- a/fs/nilfs2/page.c
+++ b/fs/nilfs2/page.c
@@ -37,8 +37,7 @@
#define NILFS_BUFFER_INHERENT_BITS \
((1UL << BH_Uptodate) | (1UL << BH_Mapped) | (1UL << BH_NILFS_Node) | \
- (1UL << BH_NILFS_Volatile) | (1UL << BH_NILFS_Allocated) | \
- (1UL << BH_NILFS_Checked))
+ (1UL << BH_NILFS_Volatile) | (1UL << BH_NILFS_Checked))
static struct buffer_head *
__nilfs_get_page_block(struct page *page, unsigned long block, pgoff_t index,
@@ -217,56 +216,6 @@ void nilfs_page_bug(struct page *page)
}
/**
- * nilfs_alloc_private_page - allocate a private page with buffer heads
- *
- * Return Value: On success, a pointer to the allocated page is returned.
- * On error, NULL is returned.
- */
-struct page *nilfs_alloc_private_page(struct block_device *bdev, int size,
- unsigned long state)
-{
- struct buffer_head *bh, *head, *tail;
- struct page *page;
-
- page = alloc_page(GFP_NOFS); /* page_count of the returned page is 1 */
- if (unlikely(!page))
- return NULL;
-
- lock_page(page);
- head = alloc_page_buffers(page, size, 0);
- if (unlikely(!head)) {
- unlock_page(page);
- __free_page(page);
- return NULL;
- }
-
- bh = head;
- do {
- bh->b_state = (1UL << BH_NILFS_Allocated) | state;
- tail = bh;
- bh->b_bdev = bdev;
- bh = bh->b_this_page;
- } while (bh);
-
- tail->b_this_page = head;
- attach_page_buffers(page, head);
-
- return page;
-}
-
-void nilfs_free_private_page(struct page *page)
-{
- BUG_ON(!PageLocked(page));
- BUG_ON(page->mapping);
-
- if (page_has_buffers(page) && !try_to_free_buffers(page))
- NILFS_PAGE_BUG(page, "failed to free page");
-
- unlock_page(page);
- __free_page(page);
-}
-
-/**
* nilfs_copy_page -- copy the page with buffers
* @dst: destination page
* @src: source page