From patchwork Mon Feb 12 07:13:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13552732 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5651012B9F; Mon, 12 Feb 2024 07:14:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707722056; cv=none; b=J+yvjj1z0PXrtjp6CoNnPR6PoY8jczy/D/DZWqKsU8S7h3GtCxsOfS7KEviWTEHIKXBumfw6dm1ti9ZU/y/exCufYMH4nbFpOrqBi8E+4RQPcWBaaEIxpLWlqSrPyuZFtgVTsI5bBzskZJOdvmIPqRKIFUG4LYF9zn+DujgZ9Uk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707722056; c=relaxed/simple; bh=ukY0COvN+NL1nMv2vyEwUNEfkq+t2wK4jlewlvvA9Aw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ei9GZKiuGgUkUEmpE1DjqoaWixf+LhhMECtvgu17v6qqrIFtEdpeO7dDCTeX/dO0WcFjN73FA0yDoe5rME37oEkEJn0x1Zqma11oPU3vejIp/F96hr1BK1pRoUvTtiruNHC2+i1aVG2GysoJydZioYzGuWV1S1ikVLX16+ytKkw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=QMXkj9OR; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="QMXkj9OR" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=KUIj5droJWBY9JuTDNlu6m/OZ7SC5gyUm02IKuKQE8M=; b=QMXkj9OR68fUtzLzKk+BxuxP5V lLcsfARWxz3J73jW+4CgAYNChX8vH6k0bYjyje3Ka3UUp3oc6GxLgHxFAdgUXy8I3Q3cRXMjVbNo2 UTdZOTlyUdiKdDXVA+30f9Hz4sGb1b9PlTE9EOQ+6g0S36udj5BbdA6CafPZ9Po96XiHG8eDOgtKG FKwNEztpeIb/BiXUv4XWkKCconDCsJXg0G+1M929zR6uRK51QBCmXgoU2HM5G4xb+Jbb2b9r/568X TIwGtt07kVctUBqVnmuuBQ/x2I5CUpuUf0jYc9Ig1T/eFiRNpVsz+Ge0Z6jbgho4bypbjl34cJZtc ux8+JkwA==; Received: from [2001:4bb8:190:6eab:75e9:7295:a6e3:c35d] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1rZQW4-00000004SsL-0LR5; Mon, 12 Feb 2024 07:14:12 +0000 From: Christoph Hellwig To: linux-mm@kvack.org Cc: Matthew Wilcox , Jan Kara , David Howells , Brian Foster , Christian Brauner , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Jan Kara , Dave Chinner Subject: [PATCH 05/14] writeback: only update ->writeback_index for range_cyclic writeback Date: Mon, 12 Feb 2024 08:13:39 +0100 Message-Id: <20240212071348.1369918-6-hch@lst.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240212071348.1369918-1-hch@lst.de> References: <20240212071348.1369918-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html mapping->writeback_index is only [1] used as the starting point for range_cyclic writeback, so there is no point in updating it for other types of writeback. [1] except for btrfs_defrag_file which does really odd things with mapping->writeback_index. But btrfs doesn't use write_cache_pages at all, so this isn't relevant here. Signed-off-by: Christoph Hellwig Reviewed-by: Brian Foster Reviewed-by: Jan Kara Acked-by: Dave Chinner --- mm/page-writeback.c | 24 ++++++++++++++---------- 1 file changed, 14 insertions(+), 10 deletions(-) diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 06afba8f078515..4d862f196d1f05 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -2403,7 +2403,6 @@ int write_cache_pages(struct address_space *mapping, pgoff_t index; pgoff_t end; /* Inclusive */ pgoff_t done_index; - int range_whole = 0; xa_mark_t tag; folio_batch_init(&fbatch); @@ -2413,8 +2412,6 @@ int write_cache_pages(struct address_space *mapping, } else { index = wbc->range_start >> PAGE_SHIFT; end = wbc->range_end >> PAGE_SHIFT; - if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) - range_whole = 1; } if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) { tag_pages_for_writeback(mapping, index, end); @@ -2518,14 +2515,21 @@ int write_cache_pages(struct address_space *mapping, } /* - * If we hit the last page and there is more work to be done: wrap - * back the index back to the start of the file for the next - * time we are called. + * For range cyclic writeback we need to remember where we stopped so + * that we can continue there next time we are called. If we hit the + * last page and there is more work to be done, wrap back to the start + * of the file. + * + * For non-cyclic writeback we always start looking up at the beginning + * of the file if we are called again, which can only happen due to + * -ENOMEM from the file system. */ - if (wbc->range_cyclic && !done) - done_index = 0; - if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) - mapping->writeback_index = done_index; + if (wbc->range_cyclic) { + if (done) + mapping->writeback_index = done_index; + else + mapping->writeback_index = 0; + } return ret; }