From patchwork Tue Mar 16 19:43:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Omar Sandoval X-Patchwork-Id: 12143673 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 A14CFC4332E for ; Tue, 16 Mar 2021 19:45:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 80C5264E33 for ; Tue, 16 Mar 2021 19:45:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240593AbhCPTpl (ORCPT ); Tue, 16 Mar 2021 15:45:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35728 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240596AbhCPTog (ORCPT ); Tue, 16 Mar 2021 15:44:36 -0400 Received: from mail-pf1-x42f.google.com (mail-pf1-x42f.google.com [IPv6:2607:f8b0:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2AD21C061765 for ; Tue, 16 Mar 2021 12:44:32 -0700 (PDT) Received: by mail-pf1-x42f.google.com with SMTP id y13so9558956pfr.0 for ; Tue, 16 Mar 2021 12:44:32 -0700 (PDT) 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=UnFkdLJUN9TtvBAkU5e5gC8CjqnLnnasN5mbIWLeeYY=; b=ReDgWn6Bd9w+s2lcR0+83v4j8619TtqfvJyE6zZDOVJkwN3Ar50vaup7tsLEC9aqf3 4Gljz73V+iSHPmbi/lKJlootjqYPmlXHpsFeTLLsvdPQTAfrAKC4Te+Lv1jXMK2tGquQ K5FSdG1KcsYd1nGfDp3E63U0z5L+Oz+hJXNvewNb3MIvlh21srFYJoY4NNKziyZWg51E BCWE6ixSW4CtZwDv/04dMlGew4HuQI0X6saI3dH4v9VYBj1agXbr+INJl3hJtmFnEvdI tUyvwa9HuefXJzS5aMmNZl1K5XIxCQYtnt2yhSQLoc9BdIpY05FEWM3oS0f1UdOVVGW7 uTKA== 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=UnFkdLJUN9TtvBAkU5e5gC8CjqnLnnasN5mbIWLeeYY=; b=NKmszMw5GTqoGmDVFcxNCm68W/qkd6AA5ZCLN1jkfZDKNbHrowVNhBiUmyV3UC/xOu z2bpdeAB0Ia3ZlLE1MQvZDjRHzEh9dkJFLfUp1FEJCYO/nTNQ1cxzJPnAqwhL5zYrgxB HvQ3pvx7U6nh0pay90vY0YBfSYqXl9oFp8czsymiu+YqXKZXFDTHciDCaBm9G4mNQ0yR nLTXFd0VT2HX1Ucw9jorYomFyVSLmmu3YrO2na6+rO/93JqU9eRoc6reTHPbr3ekGwE0 sGDrlLeIr1yxdPjowr5gxYKpbF1e2CBZoICoMz+yfM3wRc7zpp/QEWVBX+JETdX+K+nE xS5g== X-Gm-Message-State: AOAM531XVPPr19TzY6M1boRssxydOd/aMnQu2vHeB4bqdwwfd6rDRYX6 YbB9j3bGZPV5aPfWOjvKSzYVzQ== X-Google-Smtp-Source: ABdhPJwErqasvPtJK2lkxLDfU67zMGlFywvbyUETipq/bhyzk5aqcThTiFfQBAngEXwXAmZWzCFofg== X-Received: by 2002:a63:1d4d:: with SMTP id d13mr1094657pgm.103.1615923872244; Tue, 16 Mar 2021 12:44:32 -0700 (PDT) Received: from relinquished.tfbnw.net ([2620:10d:c090:400::5:532]) by smtp.gmail.com with ESMTPSA id w22sm16919104pfi.133.2021.03.16.12.44.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Mar 2021 12:44:31 -0700 (PDT) From: Omar Sandoval To: linux-btrfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, kernel-team@fb.com Subject: [PATCH v4 3/5] btrfs: send: allocate send buffer with alloc_page() and vmap() for v2 Date: Tue, 16 Mar 2021 12:43:55 -0700 Message-Id: <41449ae28ca4133f7aa27e6ec477d0c60586b3d4.1615922753.git.osandov@fb.com> X-Mailer: git-send-email 2.30.2 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);