From patchwork Fri Jan 22 20:47:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Omar Sandoval X-Patchwork-Id: 12040497 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=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 90096C433E0 for ; Fri, 22 Jan 2021 20:54:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5EADC23B08 for ; Fri, 22 Jan 2021 20:54:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728276AbhAVUyN (ORCPT ); Fri, 22 Jan 2021 15:54:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49278 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730920AbhAVUwR (ORCPT ); Fri, 22 Jan 2021 15:52:17 -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 1EED0C0698C3 for ; Fri, 22 Jan 2021 12:48:18 -0800 (PST) Received: by mail-pf1-x42a.google.com with SMTP id q20so4603827pfu.8 for ; Fri, 22 Jan 2021 12:48:18 -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=jsZgIcSUOs4ZF+x9oZeNSohaDc9IzmjXBuR8mId+lVo=; b=QEPPhNeidELcjm3SFOE8K+esrf49VJgzCfIy09/dV2TdleLzcyvjzmljmpRXeBQLEi qJmri9cDq0jT184jZVNVYaYbuAa2iyNvOjrfzCDgz1HREfobSffEJmNt7QrHr5JxyPBS ULowH7wSH3HQNnrkUvqht+2S7ySymaWDMlK87wv6SRMd7pS9EoXHpgQraBv2ua3F7aad xmfe3UHaUxFvv+n07I3Kmyz7hclo+Wa+S8J2cClxlnOfuwyomVVf8Nu7MyjWwMmBZCGo rXJZXo6bsvvDKyClF+FL6rhN0vBHiujUqWqmJ2HNEMuErQ5qeT3oQw3Lfdxno6lrSydO hOBg== 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=jsZgIcSUOs4ZF+x9oZeNSohaDc9IzmjXBuR8mId+lVo=; b=jCJQTleNQwh9Qxk766/Jo6lk6VM4PDJbEBEExhlIEdk9M7dRAAgMfysofBlrrZ39bo GRTjdWVqCLGxOnIelzuM6s7v525f/LTtZGcXU5vnCUH3hNd1mXpWO7rLDCJT0nVXL1kg eQakRmL7c7eB1e6Aq2rnPjxoXqGY6pqHx3r+E1LLRm2cprGlUpuAQW8wntUjdhbkoZmX uqD8l4PARZYjktYF0khXFu2sX42KnA035dRwztYaPTaCbLHvsBPLHUHKJ04sf/94WjRy SbiF3m1cXK1Q3M1qoB9Y/Im+L7FwWOMAor8hdHw48IOfnulhjFWJq/VALOcqOBCl2beE +nog== X-Gm-Message-State: AOAM533S4tCsh39oupAFp+uCUIJAr7pAVkqeaRgF7EVQ24GjLFTJ9uox doUIxu4bmKXcweBl0z90TvexGw== X-Google-Smtp-Source: ABdhPJxWxn6YspRRGn+XGHN4ik+yFQIWFmJZNL0Hckdjr4o5Nxi4FfwKmMN9zY8MymO/EFkE3tzPLg== X-Received: by 2002:a63:4559:: with SMTP id u25mr6352149pgk.306.1611348497672; Fri, 22 Jan 2021 12:48:17 -0800 (PST) Received: from relinquished.tfbnw.net ([2620:10d:c090:400::5:ea88]) by smtp.gmail.com with ESMTPSA id y16sm9865617pfb.83.2021.01.22.12.48.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 Jan 2021 12:48:16 -0800 (PST) From: Omar Sandoval To: linux-btrfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, kernel-team@fb.com Subject: [PATCH v3 1/5] btrfs: add send stream v2 definitions Date: Fri, 22 Jan 2021 12:47:43 -0800 Message-Id: <1bbc7fbf0efb06a0d91cb029c1a5ab5f4525c71c.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 This adds the definitions of the new commands for send stream version 2 and their respective attributes: fallocate, FS_IOC_SETFLAGS (a.k.a. chattr), and encoded writes. It also documents two changes to the send stream format in v2: the receiver shouldn't assume a maximum command size, and the DATA attribute is encoded differently to allow for writes larger than 64k. These will be implemented in subsequent changes, and then the ioctl will accept the new flags. Reviewed-by: Josef Bacik Signed-off-by: Omar Sandoval --- fs/btrfs/send.c | 2 +- fs/btrfs/send.h | 30 +++++++++++++++++++++++++++++- include/uapi/linux/btrfs.h | 13 +++++++++++++ 3 files changed, 43 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index 3bcbf2bcb869..d07570588a16 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c @@ -7267,7 +7267,7 @@ long btrfs_ioctl_send(struct file *mnt_file, struct btrfs_ioctl_send_args *arg) sctx->clone_roots_cnt = arg->clone_sources_count; - sctx->send_max_size = BTRFS_SEND_BUF_SIZE; + sctx->send_max_size = BTRFS_SEND_BUF_SIZE_V1; sctx->send_buf = kvmalloc(sctx->send_max_size, GFP_KERNEL); if (!sctx->send_buf) { ret = -ENOMEM; diff --git a/fs/btrfs/send.h b/fs/btrfs/send.h index de91488b7cd0..9f4f7b96b1eb 100644 --- a/fs/btrfs/send.h +++ b/fs/btrfs/send.h @@ -12,7 +12,11 @@ #define BTRFS_SEND_STREAM_MAGIC "btrfs-stream" #define BTRFS_SEND_STREAM_VERSION 1 -#define BTRFS_SEND_BUF_SIZE SZ_64K +/* + * In send stream v1, no command is larger than 64k. In send stream v2, no limit + * should be assumed. + */ +#define BTRFS_SEND_BUF_SIZE_V1 SZ_64K enum btrfs_tlv_type { BTRFS_TLV_U8, @@ -76,6 +80,13 @@ enum btrfs_send_cmd { BTRFS_SEND_C_END, BTRFS_SEND_C_UPDATE_EXTENT, + + /* The following commands were added in send stream v2. */ + + BTRFS_SEND_C_FALLOCATE, + BTRFS_SEND_C_SETFLAGS, + BTRFS_SEND_C_ENCODED_WRITE, + __BTRFS_SEND_C_MAX, }; #define BTRFS_SEND_C_MAX (__BTRFS_SEND_C_MAX - 1) @@ -106,6 +117,11 @@ enum { BTRFS_SEND_A_PATH_LINK, BTRFS_SEND_A_FILE_OFFSET, + /* + * In send stream v2, this attribute is special: it must be the last + * attribute in a command, its header contains only the type, and its + * length is implicitly the remaining length of the command. + */ BTRFS_SEND_A_DATA, BTRFS_SEND_A_CLONE_UUID, @@ -114,6 +130,18 @@ enum { BTRFS_SEND_A_CLONE_OFFSET, BTRFS_SEND_A_CLONE_LEN, + /* The following attributes were added in send stream v2. */ + + BTRFS_SEND_A_FALLOCATE_MODE, + + BTRFS_SEND_A_SETFLAGS_FLAGS, + + BTRFS_SEND_A_UNENCODED_FILE_LEN, + BTRFS_SEND_A_UNENCODED_LEN, + BTRFS_SEND_A_UNENCODED_OFFSET, + BTRFS_SEND_A_COMPRESSION, + BTRFS_SEND_A_ENCRYPTION, + __BTRFS_SEND_A_MAX, }; #define BTRFS_SEND_A_MAX (__BTRFS_SEND_A_MAX - 1) diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h index 5df73001aad4..93aa0932234e 100644 --- a/include/uapi/linux/btrfs.h +++ b/include/uapi/linux/btrfs.h @@ -770,6 +770,19 @@ struct btrfs_ioctl_received_subvol_args { */ #define BTRFS_SEND_FLAG_OMIT_END_CMD 0x4 +/* + * Use version 2 of the send stream, which adds new commands and supports larger + * writes. + */ +#define BTRFS_SEND_FLAG_STREAM_V2 0x8 + +/* + * Send compressed data using the ENCODED_WRITE command instead of decompressing + * the data and sending it with the WRITE command. This requires + * BTRFS_SEND_FLAG_STREAM_V2. + */ +#define BTRFS_SEND_FLAG_COMPRESSED 0x10 + #define BTRFS_SEND_FLAG_MASK \ (BTRFS_SEND_FLAG_NO_FILE_DATA | \ BTRFS_SEND_FLAG_OMIT_STREAM_HEADER | \