Commit eb14ab8e authored by Chris Mason's avatar Chris Mason
Browse files

Btrfs: fix page->private races 



There is a race where btrfs_releasepage can drop the
page->private contents just as alloc_extent_buffer is setting
up pages for metadata.  Because of how the Btrfs page flags work,
this results in us skipping the crc on the page during IO.

This patch sovles the race by waiting until after the extent buffer
is inserted into the radix tree before it sets page private.

Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 3a90983d

fs/btrfs/disk-io.c

+6 −2
Original line number Diff line number Diff line
@@ -359,10 +359,14 @@ static int csum_dirty_buffer(struct btrfs_root *root, struct page *page) 


	tree = &BTRFS_I(page->mapping->host)->io_tree;



	if (page->private == EXTENT_PAGE_PRIVATE)

	if (page->private == EXTENT_PAGE_PRIVATE) {

		WARN_ON(1);

		goto out;

	if (!page->private)

	}

	if (!page->private) {

		WARN_ON(1);

		goto out;

	}

	len = page->private >> 2;

	WARN_ON(len == 0);

fs/btrfs/extent_io.c

+35 −3
Original line number Diff line number Diff line
@@ -1946,6 +1946,7 @@ void set_page_extent_mapped(struct page *page) 


static void set_page_extent_head(struct page *page, unsigned long len)

{

	WARN_ON(!PagePrivate(page));

	set_page_private(page, EXTENT_PAGE_PRIVATE_FIRST_PAGE | len << 2);

}
@@ -3195,6 +3196,12 @@ struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, 
		}

		if (!PageUptodate(p))

			uptodate = 0;



		/*

		 * see below about how we avoid a nasty race with release page

		 * and why we unlock later

		 */

		if (i != 0)

			unlock_page(p);

	}

	if (uptodate)
@@ -3219,9 +3226,26 @@ struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, 
	atomic_inc(&eb->refs);

	spin_unlock(&tree->buffer_lock);

	radix_tree_preload_end();



	/*

	 * there is a race where release page may have

	 * tried to find this extent buffer in the radix

	 * but failed.  It will tell the VM it is safe to

	 * reclaim the, and it will clear the page private bit.

	 * We must make sure to set the page private bit properly

	 * after the extent buffer is in the radix tree so

	 * it doesn't get lost

	 */

	set_page_extent_mapped(eb->first_page);

	set_page_extent_head(eb->first_page, eb->len);

	if (!page0)

		unlock_page(eb->first_page);

	return eb;



free_eb:

	if (eb->first_page && !page0)

		unlock_page(eb->first_page);



	if (!atomic_dec_and_test(&eb->refs))

		return exists;

	btrfs_release_extent_buffer(eb);
@@ -3272,10 +3296,11 @@ int clear_extent_buffer_dirty(struct extent_io_tree *tree, 
			continue;



		lock_page(page);

		WARN_ON(!PagePrivate(page));



		set_page_extent_mapped(page);

		if (i == 0)

			set_page_extent_head(page, eb->len);

		else

			set_page_private(page, EXTENT_PAGE_PRIVATE);



		clear_page_dirty_for_io(page);

		spin_lock_irq(&page->mapping->tree_lock);
@@ -3465,6 +3490,13 @@ int read_extent_buffer_pages(struct extent_io_tree *tree, 


	for (i = start_i; i < num_pages; i++) {

		page = extent_buffer_page(eb, i);



		WARN_ON(!PagePrivate(page));



		set_page_extent_mapped(page);

		if (i == 0)

			set_page_extent_head(page, eb->len);



		if (inc_all_pages)

			page_cache_get(page);

		if (!PageUptodate(page)) {

CRA Git | Maintained and supported by SUSTech CRA and CCSE