From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from firstgate.proxmox.com (firstgate.proxmox.com [212.224.123.68]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.proxmox.com (Postfix) with ESMTPS id F095466224 for ; Thu, 5 Nov 2020 17:06:58 +0100 (CET) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id E188C1A78E for ; Thu, 5 Nov 2020 17:06:58 +0100 (CET) Received: from proxmox-new.maurer-it.com (proxmox-new.maurer-it.com [212.186.127.180]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by firstgate.proxmox.com (Proxmox) with ESMTPS id 30CB61A765 for ; Thu, 5 Nov 2020 17:06:55 +0100 (CET) Received: from proxmox-new.maurer-it.com (localhost.localdomain [127.0.0.1]) by proxmox-new.maurer-it.com (Proxmox) with ESMTP id F042D4604E for ; Thu, 5 Nov 2020 17:06:54 +0100 (CET) From: Stoiko Ivanov To: pve-devel@lists.proxmox.com Date: Thu, 5 Nov 2020 17:06:30 +0100 Message-Id: <20201105160631.26834-3-s.ivanov@proxmox.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201105160631.26834-1-s.ivanov@proxmox.com> References: <20201105160631.26834-1-s.ivanov@proxmox.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SPAM-LEVEL: Spam detection results: 0 AWL 0.099 Adjusted score from AWL reputation of From: address KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment RCVD_IN_DNSWL_MED -2.3 Sender listed at https://www.dnswl.org/, medium trust SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record URIBL_BLOCKED 0.001 ADMINISTRATOR NOTICE: The query to URIBL was blocked. See http://wiki.apache.org/spamassassin/DnsBlocklists#dnsbl-block for more information. [storage.pm, rbdplugin.pm, plugin.pm] Subject: [pve-devel] [PATCH storage 1/1] add check for fsfreeze before snapshot X-BeenThere: pve-devel@lists.proxmox.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Proxmox VE development discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Nov 2020 16:06:59 -0000 In order to take a snapshot of a container volume, which can be mounted read-only with RBD, the volume needs to be frozen (fsfreeze (8)) before taking the snapshot. Only RBD is affected by this (for LVMThin this is handled by the devicemapper). This commit adds helpers to determine if the FIFREEZE ioctl needs to be called for the volume. Signed-off-by: Stoiko Ivanov --- PVE/Storage.pm | 12 ++++++++++++ PVE/Storage/Plugin.pm | 4 ++++ PVE/Storage/RBDPlugin.pm | 5 +++++ 3 files changed, 21 insertions(+) diff --git a/PVE/Storage.pm b/PVE/Storage.pm index cd7b5ff..27223b6 100755 --- a/PVE/Storage.pm +++ b/PVE/Storage.pm @@ -287,6 +287,18 @@ sub volume_snapshot_delete { } } +# check if a filesystem on top of a volume needs to flush it's journal for +# constency (see fsfreeze(8)) before a snapshot is taken - needed for +# container mountpoints +sub volume_snapshot_needs_fsfreeze { + my ($cfg, $volid) = @_; + + my ($storeid, $volname) = parse_volume_id($volid); + my $scfg = storage_config($cfg, $storeid); + my $plugin = PVE::Storage::Plugin->lookup($scfg->{type}); + return $plugin->volume_snapshot_needs_fsfreeze(); +} + # check if a volume or snapshot supports a given feature # $feature - one of: # clone - linked clone is possible diff --git a/PVE/Storage/Plugin.pm b/PVE/Storage/Plugin.pm index 63f68da..a046640 100644 --- a/PVE/Storage/Plugin.pm +++ b/PVE/Storage/Plugin.pm @@ -888,6 +888,10 @@ sub volume_snapshot_delete { return undef; } +sub volume_snapshot_needs_fsfreeze { + + return 0; +} sub storage_can_replicate { my ($class, $scfg, $storeid, $format) = @_; diff --git a/PVE/Storage/RBDPlugin.pm b/PVE/Storage/RBDPlugin.pm index 38f2b46..94df89d 100644 --- a/PVE/Storage/RBDPlugin.pm +++ b/PVE/Storage/RBDPlugin.pm @@ -694,6 +694,11 @@ sub volume_snapshot_delete { return undef; } +sub volume_snapshot_needs_fsfreeze { + + return 1; +} + sub volume_has_feature { my ($class, $scfg, $feature, $storeid, $volname, $snapname, $running) = @_; -- 2.20.1