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From: Aaron Lauterer <a.lauterer@proxmox.com>
To: pve-devel@lists.proxmox.com
Date: Fri, 6 Aug 2021 15:46:40 +0200
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Subject: [pve-devel] [PATCH storage 2/9] add disk rename feature
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Functionality has been added for the following storage types:
* directory ones, based on the default implementation:
* directory
* NFS
* CIFS
* gluster
* ZFS
* (thin) LVM
* Ceph
A new feature `rename` has been introduced to mark which storage
plugin supports the feature.
Version API and AGE have been bumped.
The storage gets locked and each plugin checks if the target volume
already exists prior renaming.
This is done because there could be a race condition from the time the
external caller requests a new free disk name to the time the volume is
actually renamed.
Signed-off-by: Aaron Lauterer <a.lauterer@proxmox.com>
---
v1 -> v2:
* many small fixes and improvements
* rename_volume now accepts $source_volname instead of $source_volid
helps us to avoid to parse the volid a second time
rfc -> v1:
* reduced number of parameters to minimum needed, plugins infer needed
information themselves
* added storage locking and checking if volume already exists
* parse target_volname prior to renaming to check if valid
old dedicated API endpoint -> rfc:
only do rename now but the rename function handles templates and returns
the new volid as this can be differently handled on some storages.
PVE/Storage.pm | 20 +++++++++++++++--
PVE/Storage/LVMPlugin.pm | 24 ++++++++++++++++++++
PVE/Storage/LvmThinPlugin.pm | 1 +
PVE/Storage/Plugin.pm | 43 ++++++++++++++++++++++++++++++++++++
PVE/Storage/RBDPlugin.pm | 28 +++++++++++++++++++++++
PVE/Storage/ZFSPoolPlugin.pm | 24 ++++++++++++++++++++
6 files changed, 138 insertions(+), 2 deletions(-)
diff --git a/PVE/Storage.pm b/PVE/Storage.pm
index c38fe7b..2430991 100755
--- a/PVE/Storage.pm
+++ b/PVE/Storage.pm
@@ -41,11 +41,11 @@ use PVE::Storage::PBSPlugin;
use PVE::Storage::BTRFSPlugin;
# Storage API version. Increment it on changes in storage API interface.
-use constant APIVER => 9;
+use constant APIVER => 10;
# 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 => 0;
+use constant APIAGE => 1;
# load standard plugins
PVE::Storage::DirPlugin->register();
@@ -358,6 +358,7 @@ sub volume_snapshot_needs_fsfreeze {
# snapshot - taking a snapshot is possible
# sparseinit - volume is sparsely initialized
# template - conversion to base image is possible
+# rename - renaming volumes is possible
# $snap - check if the feature is supported for a given snapshot
# $running - if the guest owning the volume is running
# $opts - hash with further options:
@@ -1866,6 +1867,21 @@ sub complete_volume {
return $res;
}
+sub rename_volume {
+ my ($cfg, $source_volid, $target_volname) = @_;
+
+ my ($storeid, $source_volname) = parse_volume_id($source_volid);
+
+ activate_storage($cfg, $storeid);
+
+ my $scfg = storage_config($cfg, $storeid);
+ my $plugin = PVE::Storage::Plugin->lookup($scfg->{type});
+
+ return $plugin->cluster_lock_storage($storeid, $scfg->{shared}, undef, sub {
+ return $plugin->rename_volume($scfg, $storeid, $source_volname, $target_volname);
+ });
+}
+
# Various io-heavy operations require io/bandwidth limits which can be
# configured on multiple levels: The global defaults in datacenter.cfg, and
# per-storage overrides. When we want to do a restore from storage A to storage
diff --git a/PVE/Storage/LVMPlugin.pm b/PVE/Storage/LVMPlugin.pm
index 139d391..d28a94c 100644
--- a/PVE/Storage/LVMPlugin.pm
+++ b/PVE/Storage/LVMPlugin.pm
@@ -339,6 +339,15 @@ sub lvcreate {
run_command($cmd, errmsg => "lvcreate '$vg/$name' error");
}
+sub lvrename {
+ my ($vg, $oldname, $newname) = @_;
+
+ run_command(
+ ['/sbin/lvrename', $vg, $oldname, $newname],
+ errmsg => "lvrename '${vg}/${oldname}' to '${newname}' error"
+ );
+}
+
sub alloc_image {
my ($class, $storeid, $scfg, $vmid, $fmt, $name, $size) = @_;
@@ -584,6 +593,7 @@ sub volume_has_feature {
my $features = {
copy => { base => 1, current => 1},
+ rename => {current => 1},
};
my ($vtype, $name, $vmid, $basename, $basevmid, $isBase) =
@@ -692,4 +702,18 @@ sub volume_import_write {
input => '<&'.fileno($input_fh));
}
+sub rename_volume {
+ my ($class, $scfg, $storeid, $source_volname, $target_volname) = @_;
+
+ $class->parse_volname($target_volname);
+
+ my $vg = $scfg->{vgname};
+ my $lvs = lvm_list_volumes($vg);
+ die "target volume '${target_volname}' already exists\n"
+ if ($lvs->{$vg}->{$target_volname});
+
+ lvrename($vg, $source_volname, $target_volname);
+ return "${storeid}:${target_volname}";
+}
+
1;
diff --git a/PVE/Storage/LvmThinPlugin.pm b/PVE/Storage/LvmThinPlugin.pm
index 4ba6f90..c24af22 100644
--- a/PVE/Storage/LvmThinPlugin.pm
+++ b/PVE/Storage/LvmThinPlugin.pm
@@ -355,6 +355,7 @@ sub volume_has_feature {
template => { current => 1},
copy => { base => 1, current => 1, snap => 1},
sparseinit => { base => 1, current => 1},
+ rename => {current => 1},
};
my ($vtype, $name, $vmid, $basename, $basevmid, $isBase) =
diff --git a/PVE/Storage/Plugin.pm b/PVE/Storage/Plugin.pm
index e043329..7b75252 100644
--- a/PVE/Storage/Plugin.pm
+++ b/PVE/Storage/Plugin.pm
@@ -971,6 +971,7 @@ sub volume_has_feature {
snap => {qcow2 => 1} },
sparseinit => { base => {qcow2 => 1, raw => 1, vmdk => 1},
current => {qcow2 => 1, raw => 1, vmdk => 1} },
+ rename => { current => {qcow2 => 1, raw => 1, vmdk => 1} },
};
# clone_image creates a qcow2 volume
@@ -978,6 +979,14 @@ sub volume_has_feature {
defined($opts->{valid_target_formats}) &&
!(grep { $_ eq 'qcow2' } @{$opts->{valid_target_formats}});
+ if (
+ $feature eq 'rename'
+ && $class->can('api')
+ && $class->api() < 10
+ ) {
+ return 0;
+ }
+
my ($vtype, $name, $vmid, $basename, $basevmid, $isBase, $format) =
$class->parse_volname($volname);
@@ -1495,4 +1504,38 @@ sub volume_import_formats {
return ();
}
+sub rename_volume {
+ my ($class, $scfg, $storeid, $source_volname, $target_volname) = @_;
+ die "no path found\n" if !exists($scfg->{path});
+ die "not implemented in storage plugin '$class'\n" if $class->can('api') && $class->api() < 10;
+
+ my (undef, undef, $target_vmid) = $class->parse_volname($target_volname);
+
+ my (
+ undef,
+ $source_name,
+ $source_vmid,
+ $base_name,
+ $base_vmid,
+ undef,
+ $format
+ ) = $class->parse_volname($source_volname);
+
+ my $basedir = $class->get_subdir($scfg, 'images');
+
+ mkpath "${basedir}/${target_vmid}";;
+
+ my $old_path = "${basedir}/${source_volname}";
+ my $new_path = "${basedir}/${target_volname}";
+
+ die "target volume '${target_volname}' already exists\n" if -e $new_path;
+
+ my $base = $base_name ? "${base_vmid}/${base_name}/" : '';
+
+ rename($old_path, $new_path) ||
+ die "rename '$old_path' to '$new_path' failed - $!\n";
+
+ return "${storeid}:${base}${target_volname}";
+}
+
1;
diff --git a/PVE/Storage/RBDPlugin.pm b/PVE/Storage/RBDPlugin.pm
index a8d1243..88350d2 100644
--- a/PVE/Storage/RBDPlugin.pm
+++ b/PVE/Storage/RBDPlugin.pm
@@ -728,6 +728,7 @@ sub volume_has_feature {
template => { current => 1},
copy => { base => 1, current => 1, snap => 1},
sparseinit => { base => 1, current => 1},
+ rename => {current => 1},
};
my ($vtype, $name, $vmid, $basename, $basevmid, $isBase) = $class->parse_volname($volname);
@@ -743,4 +744,31 @@ sub volume_has_feature {
return undef;
}
+sub rename_volume {
+ my ($class, $scfg, $storeid, $source_volname, $target_volname) = @_;
+
+ $class->parse_volname($target_volname);
+
+ my (undef, undef, $source_vmid, $base_name) = $class->parse_volname($source_volname);
+
+ eval {
+ my $cmd = $rbd_cmd->($scfg, $storeid, 'info', $target_volname);
+ run_rbd_command($cmd, errmsg => "exist check", quiet => 1, noerr => 1);
+ };
+ my $err = $@;
+ die "target volume '${target_volname}' already exists\n"
+ if !$err;
+
+ my $cmd = $rbd_cmd->($scfg, $storeid, 'rename', $source_volname, $target_volname);
+
+ run_rbd_command(
+ $cmd,
+ errmsg => "could not rename image '${source_volname}' to '${target_volname}'",
+ );
+
+ $base_name = $base_name ? "${base_name}/" : '';
+
+ return "${storeid}:${base_name}${target_volname}";
+}
+
1;
diff --git a/PVE/Storage/ZFSPoolPlugin.pm b/PVE/Storage/ZFSPoolPlugin.pm
index c4be70f..543eef9 100644
--- a/PVE/Storage/ZFSPoolPlugin.pm
+++ b/PVE/Storage/ZFSPoolPlugin.pm
@@ -687,6 +687,7 @@ sub volume_has_feature {
copy => { base => 1, current => 1},
sparseinit => { base => 1, current => 1},
replicate => { base => 1, current => 1},
+ rename => {current => 1},
};
my ($vtype, $name, $vmid, $basename, $basevmid, $isBase) =
@@ -789,4 +790,27 @@ sub volume_import_formats {
return $class->volume_export_formats($scfg, $storeid, $volname, $snapshot, $base_snapshot, $with_snapshots);
}
+sub rename_volume {
+ my ($class, $scfg, $storeid, $source_volname, $target_volname) = @_;
+
+ print "parsing volname: $target_volname\n";
+ $class->parse_volname($target_volname);
+
+ my (undef, undef, $source_vmid, $base_name) = $class->parse_volname($source_volname);
+
+ my $pool = $scfg->{pool};
+ my $source_zfspath = "${pool}/${source_volname}";
+ my $target_zfspath = "${pool}/${target_volname}";
+
+ my $exists = 0 == run_command(['zfs', 'get', '-H', 'name', $target_zfspath],
+ noerr => 1, quiet => 1);
+ die "target volume '${target_volname}' already exists\n" if $exists;
+
+ $class->zfs_request($scfg, 5, 'rename', ${source_zfspath}, ${target_zfspath});
+
+ $base_name = $base_name ? "${base_name}/" : '';
+
+ return "${storeid}:${base_name}${target_volname}";
+}
+
1;
--
2.30.2