[pve-devel] [PATCH storage] ZFSPoolPlugin: fix #2662 get volume size correctly

[Aaron Lauterer]

Getting the volume sizes as byte values instead of converted to human
readable units helps to avoid rounding errors in the further processing
if the volume size is more on the odd side.

The `zfs list` command supports the p(arseable) flag since a few years
now.
When returning the size in bytes there is no  calculation performed and
thus we need to explicitly cast the size to an integer before returning
it.

Signed-off-by: Aaron Lauterer <a.lauterer at proxmox.com>
---

I don't think we need to worry about other ZFS implementations regarding
ZFS over iSCSI. FreeBSD supports it since 9.3 [0], released mid 2014.
Illumos added it in 2013 [1].

[0] https://www.freebsd.org/cgi/man.cgi?query=zfs&apropos=0&sektion=0&manpath=FreeBSD+9.3-RELEASE&arch=default&format=html
[1] https://github.com/illumos/illumos-gate/commit/43d68d68c1ce08fb35026bebfb141af422e7082e#diff-b138320fc5f9d5c48bb4b03a5e4e4cbb

 PVE/Storage/ZFSPoolPlugin.pm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/PVE/Storage/ZFSPoolPlugin.pm b/PVE/Storage/ZFSPoolPlugin.pm
index b538e3b..cb3f2f0 100644
--- a/PVE/Storage/ZFSPoolPlugin.pm
+++ b/PVE/Storage/ZFSPoolPlugin.pm
@@ -81,7 +81,7 @@ sub zfs_parse_size {
 	    $size = ceil($size);
 	}
 
-	return $size;
+	return $size + 0;
 
     }
 
@@ -400,7 +400,7 @@ sub zfs_delete_zvol {
 sub zfs_list_zvol {
     my ($class, $scfg) = @_;
 
-    my $text = $class->zfs_request($scfg, 10, 'list', '-o', 'name,volsize,origin,type,refquota', '-t', 'volume,filesystem', '-Hr');
+    my $text = $class->zfs_request($scfg, 10, 'list', '-o', 'name,volsize,origin,type,refquota', '-t', 'volume,filesystem', '-Hrp');
     my $zvols = zfs_parse_zvol_list($text);
     return undef if !$zvols;
 
-- 
2.20.1