From patchwork Thu Dec 7 07:26:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13482806 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Wh70aY3q" Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 239231AD; Wed, 6 Dec 2023 23:27:29 -0800 (PST) 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=7reiZj9zur86NcKW9Z3NM8dpV8YTIvvmOrGho5B9fuE=; b=Wh70aY3qfNq/eoknmeAT/td7Ks XGIzQJ7jaItCrbqi+AmZKMTRKRIAR4ECsRA5Y8EqEes5jz2rlUgnfKFfGR2siHYX4XizKw5wrBZoM z5WRGkPdgY4YpDl5gwV/37KUjmTDKnzFa0ApseBqX30n1XE2vrytLbwy61xTYS/bJgt/IJ53Z2FEM qkZ2G5JXkh5W/16YdQAHECEtpMkUtevQ8x68/MmU/6QLJ2V0XswDpyNaeCTrOSxRe7YWKyDtCUnFh CknUX3XcqQWxDMyi3AdKxKF7PCSzn2U5LaqK0RO0RKkx8PtdQKig/wmWuH7YY/aRm4ZhgScxnxksc QIUvE3Xw==; Received: from [2001:4bb8:191:e7ca:4bf6:cea4:9bbf:8b02] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1rB8mz-00C4xo-1S; Thu, 07 Dec 2023 07:27:17 +0000 From: Christoph Hellwig To: Christian Brauner Cc: "Darrick J. Wong" , Chandan Babu R , Zhang Yi , Ritesh Harjani , Jens Axboe , Andreas Gruenbacher , Damien Le Moal , Naohiro Aota , Johannes Thumshirn , linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, gfs2@lists.linux.dev Subject: [PATCH 01/14] iomap: clear the per-folio dirty bits on all writeback failures Date: Thu, 7 Dec 2023 08:26:57 +0100 Message-Id: <20231207072710.176093-2-hch@lst.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231207072710.176093-1-hch@lst.de> References: <20231207072710.176093-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-block@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 write_cache_pages always clear the page dirty bit before calling into the file systems, and leaves folios with a writeback failure without the dirty bit after return. We also clear the per-block writeback bits for writeback failures unless no I/O has submitted, which will leave the folio in an inconsistent state where it doesn't have the folio dirty, but one or more per-block dirty bits. This seems to be due the place where the iomap_clear_range_dirty call was inserted into the existing not very clearly structured code when adding per-block dirty bit support and not actually intentional. Switch to always clearing the dirty on writeback failure. Fixes: 4ce02c679722 ("iomap: Add per-block dirty state tracking to improve performance") Signed-off-by: Christoph Hellwig --- fs/iomap/buffered-io.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index f72df2babe561a..fc5c64712318aa 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -1843,16 +1843,10 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc, if (unlikely(error)) { /* * Let the filesystem know what portion of the current page - * failed to map. If the page hasn't been added to ioend, it - * won't be affected by I/O completion and we must unlock it - * now. + * failed to map. */ if (wpc->ops->discard_folio) wpc->ops->discard_folio(folio, pos); - if (!count) { - folio_unlock(folio); - goto done; - } } /* @@ -1861,6 +1855,16 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc, * all the dirty bits in the folio here. */ iomap_clear_range_dirty(folio, 0, folio_size(folio)); + + /* + * If the page hasn't been added to the ioend, it won't be affected by + * I/O completion and we must unlock it now. + */ + if (error && !count) { + folio_unlock(folio); + goto done; + } + folio_start_writeback(folio); folio_unlock(folio);