From patchwork Mon Dec 18 15:35:43 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13497144 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 8F77D5D72F; Mon, 18 Dec 2023 15:36:17 +0000 (UTC) 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="Fx9/cCVV" 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=aHXKO1UbJHXuqoP1fMOkKbpvbuANBll89l/hQyqHhR4=; b=Fx9/cCVVlwYOnhe/PSU89cDqVD NI/Css67r/FlsYc8NmCfniGg54QHQxgHsspAS57gDul5cTzL0hn1ZYeRU9gC8qFIq//ZJLH1vTyTT NkYZETzb+w26apnFjyIKLapIGMmBHyHAabMX4hk9cvfq0clnn+uyJpYeekVoYtCuTYVUNQFlPatrZ SSsp/9CpzQ3RKUCNPWaBU4OgSu7Wl1+hiqb+XWiQ2Uv+YBGT9sPgftDPPkSwJXycLm4D/AKXvHjus 0HFC0kopXSnEv2BVLjCG4hwfCCGuT9gt5VWusTok0xcANlH5KBh8QDWOzHVEd1W+MU2o0JryEnPBY gQ5ZhBvA==; Received: from 2a02-8389-2341-5b80-39d3-4735-9a3c-88d8.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:39d3:4735:9a3c:88d8] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1rFFfC-00BENM-0x; Mon, 18 Dec 2023 15:36:14 +0000 From: Christoph Hellwig To: linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , Jan Kara , David Howells , Brian Foster , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 07/17] writeback: Factor writeback_get_batch() out of write_cache_pages() Date: Mon, 18 Dec 2023 16:35:43 +0100 Message-Id: <20231218153553.807799-8-hch@lst.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231218153553.807799-1-hch@lst.de> References: <20231218153553.807799-1-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 From: "Matthew Wilcox (Oracle)" This simple helper will be the basis of the writeback iterator. To make this work, we need to remember the current index and end positions in writeback_control. Signed-off-by: Matthew Wilcox (Oracle) [hch: heavily rebased, add helpers to get the tag and end index, don't keep the end index in struct writeback_control] Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara --- include/linux/writeback.h | 1 + mm/page-writeback.c | 49 +++++++++++++++++++++++++-------------- 2 files changed, 32 insertions(+), 18 deletions(-) diff --git a/include/linux/writeback.h b/include/linux/writeback.h index 390f2dd03cf27e..195393981ccb5c 100644 --- a/include/linux/writeback.h +++ b/include/linux/writeback.h @@ -81,6 +81,7 @@ struct writeback_control { /* internal fields used by the ->writepages implementation: */ struct folio_batch fbatch; + pgoff_t index; int err; #ifdef CONFIG_CGROUP_WRITEBACK diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 564d5faf562ba7..798e5264dc0353 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -2383,6 +2383,29 @@ static void writeback_finish(struct address_space *mapping, } } +static xa_mark_t wbc_to_tag(struct writeback_control *wbc) +{ + if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) + return PAGECACHE_TAG_TOWRITE; + return PAGECACHE_TAG_DIRTY; +} + +static pgoff_t wbc_end(struct writeback_control *wbc) +{ + if (wbc->range_cyclic) + return -1; + return wbc->range_end >> PAGE_SHIFT; +} + +static void writeback_get_batch(struct address_space *mapping, + struct writeback_control *wbc) +{ + folio_batch_release(&wbc->fbatch); + cond_resched(); + filemap_get_folios_tag(mapping, &wbc->index, wbc_end(wbc), + wbc_to_tag(wbc), &wbc->fbatch); +} + /** * write_cache_pages - walk the list of dirty pages of the given address space and write all of them. * @mapping: address space structure to write @@ -2419,38 +2442,30 @@ int write_cache_pages(struct address_space *mapping, void *data) { int error; - int nr_folios; - pgoff_t index; pgoff_t end; /* Inclusive */ - xa_mark_t tag; if (wbc->range_cyclic) { - index = mapping->writeback_index; /* prev offset */ + wbc->index = mapping->writeback_index; /* prev offset */ end = -1; } else { - index = wbc->range_start >> PAGE_SHIFT; + wbc->index = wbc->range_start >> PAGE_SHIFT; end = wbc->range_end >> PAGE_SHIFT; } - if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) { - tag_pages_for_writeback(mapping, index, end); - tag = PAGECACHE_TAG_TOWRITE; - } else { - tag = PAGECACHE_TAG_DIRTY; - } + if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) + tag_pages_for_writeback(mapping, wbc->index, end); folio_batch_init(&wbc->fbatch); wbc->err = 0; - while (index <= end) { + while (wbc->index <= end) { int i; - nr_folios = filemap_get_folios_tag(mapping, &index, end, - tag, &wbc->fbatch); + writeback_get_batch(mapping, wbc); - if (nr_folios == 0) + if (wbc->fbatch.nr == 0) break; - for (i = 0; i < nr_folios; i++) { + for (i = 0; i < wbc->fbatch.nr; i++) { struct folio *folio = wbc->fbatch.folios[i]; unsigned long nr; @@ -2525,8 +2540,6 @@ int write_cache_pages(struct address_space *mapping, return error; } } - folio_batch_release(&wbc->fbatch); - cond_resched(); } writeback_finish(mapping, wbc, 0);