From patchwork Fri Jan 22 20:47:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Omar Sandoval X-Patchwork-Id: 12040503 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D3AE4C433E0 for ; Fri, 22 Jan 2021 20:55:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 984D123B06 for ; Fri, 22 Jan 2021 20:55:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728924AbhAVUyw (ORCPT ); Fri, 22 Jan 2021 15:54:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49352 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730955AbhAVUxS (ORCPT ); Fri, 22 Jan 2021 15:53:18 -0500 Received: from mail-pf1-x42a.google.com (mail-pf1-x42a.google.com [IPv6:2607:f8b0:4864:20::42a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B4FFCC0698CB for ; Fri, 22 Jan 2021 12:48:29 -0800 (PST) Received: by mail-pf1-x42a.google.com with SMTP id w14so4620790pfi.2 for ; Fri, 22 Jan 2021 12:48:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=osandov-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=q4vux4IYhSQov6A9+C6Myiq5tzHRUo+ynvL8O+spikA=; b=FtQK/Ex98Udoo0JgrYnOxaWjiBAr0SUdekYO08i2VPqcHA9yPjVUClsbZ/WviMwv8Y +p1hUeVVXWIxMAvHq4dNI1e0e1s533mhvwNE/R0YggWX0fZ0ACQXe++8vy6JOMfWL+HQ o+GjzfQxfps8Znl4D533Z079K9xy6ZPPJnPypdPF18xKXimJpaubpNZip0JbksmkYo3G SkE74aNRPI8khThssP2c4LuxG8cbxswuLQhn/HtxbuyOgEbD4yroD+gqZZBC4URVn29T iV6+i5PD+Qp7DUp2VK9cQJdqtpfRZukQK5netS4xzG6uNZebvWlqCCx0C9sdLACHrWXW MQmw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=q4vux4IYhSQov6A9+C6Myiq5tzHRUo+ynvL8O+spikA=; b=XvKjVQI8gv+lHsOq7K2jTWK4taWpfzfE+6Crz+ErQcO4iVhmyuo+s349Br3sprogHi qBQbGIq6SDsPSbdEoycq3HDMMrP6OijnRuIHwBYsaWUc87tBsOsqu+Z0+wB3QsR84r6S OQaGLFyFQwHikP8DWhd1kWuf2lqUPHwKUDPiGov8Ss009yvBoaLbNQhNn1T/lq3sW6Id cZpTE/PKEXoe9DxMG7epuuD6bNlGbXGj+x3ZR9RAZWd6m6D3snSsd/4X+swDVDjG84UI ONLu+U4a40qYa6eZh9RuHG/6idHPMBFTwK9QRSF4JQq61016yPqoHgEGbrWaCWzf1k2P c9aA== X-Gm-Message-State: AOAM531V/SpOhquqQnKSUClnWsk7hOn5md1FBQ0U/f9h3+QCmvPTM05I TmqSuxL1T3lO7aYe9mJCRg1P1g== X-Google-Smtp-Source: ABdhPJzZ1HsZX1cU2xhF6PbWv2y9bIqjHhnJdl3FzEkorWh7g+QDH17IHpZEhy9WVu6ooMHTwLJsGg== X-Received: by 2002:a62:36c3:0:b029:1b9:e110:e126 with SMTP id d186-20020a6236c30000b02901b9e110e126mr6602582pfa.64.1611348509200; Fri, 22 Jan 2021 12:48:29 -0800 (PST) Received: from relinquished.tfbnw.net ([2620:10d:c090:400::5:ea88]) by smtp.gmail.com with ESMTPSA id y16sm9865617pfb.83.2021.01.22.12.48.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 Jan 2021 12:48:28 -0800 (PST) From: Omar Sandoval To: linux-btrfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, kernel-team@fb.com Subject: [PATCH v3 3/5] btrfs: send: allocate send buffer with alloc_page() and vmap() for v2 Date: Fri, 22 Jan 2021 12:47:48 -0800 Message-Id: <41449ae28ca4133f7aa27e6ec477d0c60586b3d4.1611347187.git.osandov@fb.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Omar Sandoval For encoded writes, we need the raw pages for reading compressed data directly via a bio. So, replace kvmalloc() with vmap() so we have access to the raw pages. 144k is large enough that it usually gets allocated with vmalloc(), anyways. Signed-off-by: Omar Sandoval --- fs/btrfs/send.c | 33 +++++++++++++++++++++++++++++++-- 1 file changed, 31 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index 98948568017c..25b1a60a568c 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c @@ -81,6 +81,7 @@ struct send_ctx { char *send_buf; u32 send_size; u32 send_max_size; + struct page **send_buf_pages; u64 total_send_size; u64 cmd_send_size[BTRFS_SEND_C_MAX + 1]; u64 flags; /* 'flags' member of btrfs_ioctl_send_args is u64 */ @@ -7203,6 +7204,7 @@ long btrfs_ioctl_send(struct file *mnt_file, struct btrfs_ioctl_send_args *arg) struct btrfs_root *clone_root; struct send_ctx *sctx = NULL; u32 i; + u32 send_buf_num_pages = 0; u64 *clone_sources_tmp = NULL; int clone_sources_to_rollback = 0; size_t alloc_size; @@ -7283,10 +7285,28 @@ long btrfs_ioctl_send(struct file *mnt_file, struct btrfs_ioctl_send_args *arg) if (sctx->flags & BTRFS_SEND_FLAG_STREAM_V2) { sctx->send_max_size = ALIGN(SZ_16K + BTRFS_MAX_COMPRESSED, PAGE_SIZE); + send_buf_num_pages = sctx->send_max_size >> PAGE_SHIFT; + sctx->send_buf_pages = kcalloc(send_buf_num_pages, + sizeof(*sctx->send_buf_pages), + GFP_KERNEL); + if (!sctx->send_buf_pages) { + send_buf_num_pages = 0; + ret = -ENOMEM; + goto out; + } + for (i = 0; i < send_buf_num_pages; i++) { + sctx->send_buf_pages[i] = alloc_page(GFP_KERNEL); + if (!sctx->send_buf_pages[i]) { + ret = -ENOMEM; + goto out; + } + } + sctx->send_buf = vmap(sctx->send_buf_pages, send_buf_num_pages, + VM_MAP, PAGE_KERNEL); } else { sctx->send_max_size = BTRFS_SEND_BUF_SIZE_V1; + sctx->send_buf = kvmalloc(sctx->send_max_size, GFP_KERNEL); } - sctx->send_buf = kvmalloc(sctx->send_max_size, GFP_KERNEL); if (!sctx->send_buf) { ret = -ENOMEM; goto out; @@ -7495,7 +7515,16 @@ long btrfs_ioctl_send(struct file *mnt_file, struct btrfs_ioctl_send_args *arg) fput(sctx->send_filp); kvfree(sctx->clone_roots); - kvfree(sctx->send_buf); + if (sctx->flags & BTRFS_SEND_FLAG_STREAM_V2) { + vunmap(sctx->send_buf); + for (i = 0; i < send_buf_num_pages; i++) { + if (sctx->send_buf_pages[i]) + __free_page(sctx->send_buf_pages[i]); + } + kfree(sctx->send_buf_pages); + } else { + kvfree(sctx->send_buf); + } name_cache_free(sctx);