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)) (No client certificate requested) by lists.proxmox.com (Postfix) with ESMTPS id 9360C665CF for ; Fri, 6 Nov 2020 12:24:44 +0100 (CET) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id 8FF3C208F8 for ; Fri, 6 Nov 2020 12:24:44 +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)) (No client certificate requested) by firstgate.proxmox.com (Proxmox) with ESMTPS id AC8F4208ED for ; Fri, 6 Nov 2020 12:24:43 +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 7700F45AD2 for ; Fri, 6 Nov 2020 12:24:43 +0100 (CET) From: Stoiko Ivanov To: pve-devel@lists.proxmox.com Date: Fri, 6 Nov 2020 12:24:23 +0100 Message-Id: <20201106112425.8282-3-s.ivanov@proxmox.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201106112425.8282-1-s.ivanov@proxmox.com> References: <20201106112425.8282-1-s.ivanov@proxmox.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SPAM-LEVEL: Spam detection results: 0 AWL 0.092 Adjusted score from AWL reputation of From: address KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment KAM_SHORT 0.001 Use of a URL Shortener for very short URL 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. [rbdplugin.pm, plugin.pm, storage.pm, gnu.org] Subject: [pve-devel] [PATCH storage v2 2/2] 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: Fri, 06 Nov 2020 11:24:44 -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. 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 | 16 ++++++++++++++-- PVE/Storage/Plugin.pm | 4 ++++ PVE/Storage/RBDPlugin.pm | 5 +++++ 3 files changed, 23 insertions(+), 2 deletions(-) diff --git a/PVE/Storage.pm b/PVE/Storage.pm index ad10827..9f9790d 100755 --- a/PVE/Storage.pm +++ b/PVE/Storage.pm @@ -41,11 +41,11 @@ use PVE::Storage::DRBDPlugin; use PVE::Storage::PBSPlugin; # Storage API version. Increment it on changes in storage API interface. -use constant APIVER => 6; +use constant APIVER => 7; # Age is the number of versions we're backward compatible with. # This is like having 'current=APIVER' and age='APIAGE' in libtool, # see https://www.gnu.org/software/libtool/manual/html_node/Libtool-versioning.html -use constant APIAGE => 5; +use constant APIAGE => 6; # load standard plugins PVE::Storage::DirPlugin->register(); @@ -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