From patchwork Wed Nov 18 19:18:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Omar Sandoval X-Patchwork-Id: 11915711 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=-16.7 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=unavailable 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 B5057C64E7A for ; Wed, 18 Nov 2020 19:19:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 66D102222C for ; Wed, 18 Nov 2020 19:19:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=osandov-com.20150623.gappssmtp.com header.i=@osandov-com.20150623.gappssmtp.com header.b="r3qe8rUp" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726234AbgKRTTW (ORCPT ); Wed, 18 Nov 2020 14:19:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55828 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725772AbgKRTTW (ORCPT ); Wed, 18 Nov 2020 14:19:22 -0500 Received: from mail-pf1-x442.google.com (mail-pf1-x442.google.com [IPv6:2607:f8b0:4864:20::442]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AF285C0613D4 for ; Wed, 18 Nov 2020 11:19:20 -0800 (PST) Received: by mail-pf1-x442.google.com with SMTP id i8so2030259pfk.10 for ; Wed, 18 Nov 2020 11:19:20 -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=6+TqCFRtTZvpeH3ZlWXpEBOxlCAPGP9uQJpmr+cQTds=; b=r3qe8rUpY/JvlCrrwvNYGPGrOVRSr9TYmIL14MpylkfVk+ElV8pBwgicMAHyGFzhRz IAElmlBBJhg7uGG/6zC1bfbEvmQkzNeigYzt9bcAfwlB46toPf3XB0mwR9Ms4JH1cVOA n+gJRZ4+LIPIOBOefRxEZTgNJlgppKDpCjZF42ZVV2xt0vCNbxGAJ8X/N8EbIFcme1TM hyoPoCfVbYOjCmsemTz/i21iEKbnGfdG1I438UWqpWERaz3dD2RidkhSlf+FEeYfq+zE AOqKELvQlcD8ztXFSHfBLEiX7mKRUxVX4cb7JxuM25SWalI8/wuWWi/RruNVT3KxKXSc hY4Q== 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=6+TqCFRtTZvpeH3ZlWXpEBOxlCAPGP9uQJpmr+cQTds=; b=RL7HaHnUxNPlBvJIq8wFiuk517QPIrq8r3F8pn1brH3l8rSN/2Bmjk2fKIp/N1WZJ9 7ZgRysporcKeqaGgB/VwBTg7726/1bz/EIdPSc1s7NzWROTT11ls1P0VCvpQh4pKM/Bt dl18XUUJ9uzyx6jzNJJaPDYe3jQ320u9SkSM0VcYazMU1dKd1KZ39G2KX0nYiIvfqoku Fwmm65h8XSuQhXKnuYuCeRe1xBFkW5DoUtqDc63OIN5vGrtbZtAZrsDtf9VCpKoia4Er +UxV31HS3E6FCNr76w3QnGhcioLDIfvrxebTUHn3ZXTpjuTviWn4SX0fzfa7WpuZENSZ uG+A== X-Gm-Message-State: AOAM532bLPVco5OfHiPFTfWpEqkXFKp7vCiKgJmMdSHIpIG+TVvigcUf Tomx6bBffEUCY/cVPoNCZIshwg== X-Google-Smtp-Source: ABdhPJwUJauYm1zSoMxCBLcPtfM2erSJk2A+9BBFFyNQciUwvihixuvSausqNYkrhRGa+3cNOMae4Q== X-Received: by 2002:a17:90a:aa8f:: with SMTP id l15mr496518pjq.135.1605727160278; Wed, 18 Nov 2020 11:19:20 -0800 (PST) Received: from relinquished.tfbnw.net ([2620:10d:c090:400::5:8b43]) by smtp.gmail.com with ESMTPSA id l9sm3197221pjy.10.2020.11.18.11.19.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Nov 2020 11:19:19 -0800 (PST) From: Omar Sandoval To: linux-btrfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, kernel-team@fb.com Subject: [PATCH v2 3/5] btrfs: send: allocate send buffer with alloc_page() and vmap() for v2 Date: Wed, 18 Nov 2020 11:18:48 -0800 Message-Id: <81cba691d5355e218c49c44d657a6503d30c34cd.1605723600.git.osandov@fb.com> X-Mailer: git-send-email 2.29.2 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 822458e6ffae..f04d815c5d16 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 */ @@ -7191,6 +7192,7 @@ 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; @@ -7271,10 +7273,28 @@ 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; @@ -7483,7 +7503,16 @@ 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);