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Commit 892951a9 authored by Josef Bacik's avatar Josef Bacik Committed by Chris Mason
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Btrfs: remove unused write cache pages hook 



The btree inode has it's own write cache pages so we can remove this write
cache pages hook as it's not used.  Thanks,

Signed-off-by: default avatarJosef Bacik <jbacik@fusionio.com>
parent b5bae261

fs/btrfs/disk-io.c

+0 −47
Original line number Diff line number Diff line
@@ -3347,52 +3347,6 @@ int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) 
	return btree_read_extent_buffer_pages(root, buf, 0, parent_transid);

}



int btree_lock_page_hook(struct page *page, void *data,

				void (*flush_fn)(void *))

{

	struct inode *inode = page->mapping->host;

	struct btrfs_root *root = BTRFS_I(inode)->root;

	struct extent_buffer *eb;



	/*

	 * We culled this eb but the page is still hanging out on the mapping,

	 * carry on.

	 */

	if (!PagePrivate(page))

		goto out;



	eb = (struct extent_buffer *)page->private;

	if (!eb) {

		WARN_ON(1);

		goto out;

	}

	if (page != eb->pages[0])

		goto out;



	if (!btrfs_try_tree_write_lock(eb)) {

		flush_fn(data);

		btrfs_tree_lock(eb);

	}

	btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);



	if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) {

		spin_lock(&root->fs_info->delalloc_lock);

		if (root->fs_info->dirty_metadata_bytes >= eb->len)

			root->fs_info->dirty_metadata_bytes -= eb->len;

		else

			WARN_ON(1);

		spin_unlock(&root->fs_info->delalloc_lock);

	}



	btrfs_tree_unlock(eb);

out:

	if (!trylock_page(page)) {

		flush_fn(data);

		lock_page(page);

	}

	return 0;

}



static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,

			      int read_only)

{
@@ -3787,7 +3741,6 @@ int btrfs_cleanup_transaction(struct btrfs_root *root) 
}



static struct extent_io_ops btree_extent_io_ops = {

	.write_cache_pages_lock_hook = btree_lock_page_hook,

	.readpage_end_io_hook = btree_readpage_end_io_hook,

	.readpage_io_failed_hook = btree_io_failed_hook,

	.submit_bio_hook = btree_submit_bio_hook,