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Commit ad15ec06 authored by Yan, Zheng's avatar Yan, Zheng Committed by Ilya Dryomov
Browse files

ceph: handle interrupted ceph_writepage() 



writepage() can be interrupted when it's called by direct memory
reclaimer (the direct memory relaimer is killed). To avoid lossing
data, we redirty the page.

Signed-off-by: default avatarYan, Zheng <zyan@redhat.com>
parent a78bbd4b

fs/ceph/addr.c

+18 −4
Original line number Diff line number Diff line
@@ -544,10 +544,20 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc) 
				   truncate_seq, truncate_size,

				   &inode->i_mtime, &page, 1);

	if (err < 0) {

		dout("writepage setting page/mapping error %d %p\n", err, page);

		struct writeback_control tmp_wbc;

		if (!wbc)

			wbc = &tmp_wbc;

		if (err == -ERESTARTSYS) {

			/* killed by SIGKILL */

			dout("writepage interrupted page %p\n", page);

			redirty_page_for_writepage(wbc, page);

			end_page_writeback(page);

			goto out;

		}

		dout("writepage setting page/mapping error %d %p\n",

		     err, page);

		SetPageError(page);

		mapping_set_error(&inode->i_data, err);

		if (wbc)

		wbc->pages_skipped++;

	} else {

		dout("writepage cleaned page %p\n", page);
@@ -569,12 +579,16 @@ static int ceph_writepage(struct page *page, struct writeback_control *wbc) 
	BUG_ON(!inode);

	ihold(inode);

	err = writepage_nounlock(page, wbc);

	if (err == -ERESTARTSYS) {

		/* direct memory reclaimer was killed by SIGKILL. return 0

		 * to prevent caller from setting mapping/page error */

		err = 0;

	}

	unlock_page(page);

	iput(inode);

	return err;

}





/*

 * lame release_pages helper.  release_pages() isn't exported to

 * modules.