fsfreeze_mountpoint issues the same ioctl's as fsfreeze(8) on the provided
directory (the $thaw parameter deciding between '--freeze' and '--unfreeze')
This is used for container backups on RBD, where snapshots on containers, which
are heavy on IO, are not mountable readonly, because the ext4 is not consistent
Needed to fix #2991 and #2528.
The ioctl numbers were found via strace -X verbose (and compared with the
kernel source).
Signed-off-by: Stoiko Ivanov <s.iva...@proxmox.com>
---
src/PVE/Tools.pm | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/src/PVE/Tools.pm b/src/PVE/Tools.pm
index 4b445ea..c61fc49 100644
--- a/src/PVE/Tools.pm
+++ b/src/PVE/Tools.pm
@@ -100,6 +100,9 @@ use constant {O_PATH => 0x00200000,
use constant {AT_EMPTY_PATH => 0x1000,
AT_FDCWD => -100};
+use constant {FIFREEZE => 0xc0045877,
+ FITHAW => 0xc0045878};
+
sub run_with_timeout {
my ($timeout, $code, @param) = @_;
@@ -1442,6 +1445,21 @@ sub sync_mountpoint {
die "syncfs '$path' failed - $syncfs_err\n" if defined $syncfs_err;
}
+sub fsfreeze_mountpoint {
+ my ($path, $thaw) = @_;
+
+ my $op = $thaw ? 'thaw' : 'freeze';
+ my $ioctl = $thaw ? FITHAW : FIFREEZE;
+
+ sysopen my $fd, $path, O_RDONLY|O_CLOEXEC or die "failed to open $path:
$!\n";
+ my $ioctl_err;
+ if (!ioctl($fd, $ioctl, 0)) {
+ $ioctl_err = "$!";
+ }
+ close($fd);
+ die "fs$op '$path' failed - $ioctl_err\n" if defined $ioctl_err;
+}
+
# support sending multi-part mail messages with a text and or a HTML part
# mailto may be a single email string or an array of receivers
sub sendmail {
--
2.20.1
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