Signed-off-by: Wolfgang Bumiller <[email protected]>
---
New in this version.
It's a performance knob...
PVE/Storage/BTRFSPlugin.pm | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/PVE/Storage/BTRFSPlugin.pm b/PVE/Storage/BTRFSPlugin.pm
index 072dfe0..1fe5db0 100644
--- a/PVE/Storage/BTRFSPlugin.pm
+++ b/PVE/Storage/BTRFSPlugin.pm
@@ -46,6 +46,19 @@ sub plugindata {
};
}
+sub properties {
+ return {
+ nocow => {
+ description => "Set the NOCOW flag on files."
+ . " Disables data checksumming and causes data errors to be
unrecoverable from"
+ . " while allowing direct I/O. Only use this if data does not
need to be any more"
+ . " safe than on a single ext4 formatted disk with no
underlying raid system.",
+ type => 'boolean',
+ default => 0,
+ },
+ };
+}
+
sub options {
return {
path => { fixed => 1 },
@@ -56,6 +69,7 @@ sub options {
content => { optional => 1 },
format => { optional => 1 },
is_mountpoint => { optional => 1 },
+ nocow => { optional => 1 },
# TODO: The new variant of mkdir with `populate` vs `create`...
};
}
@@ -311,7 +325,7 @@ sub alloc_image {
} elsif ($fmt eq 'raw') {
sysopen my $fh, $path, O_WRONLY | O_CREAT | O_EXCL
or die "failed to create raw file '$path' - $!\n";
- chattr($fh, ~FS_NOCOW_FL, FS_NOCOW_FL);
+ chattr($fh, ~FS_NOCOW_FL, FS_NOCOW_FL) if $scfg->{nocow};
truncate($fh, $size * 1024)
or die "failed to set file size for '$path' - $!\n";
close($fh);
--
2.30.2
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