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btrfs: die early for broken subvolume resize

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In the BTRFS plugin, resize_volume() for a subovlume currently fails
with "failed to get btrfs subvolume ID from: ". This is because the
btrfs 'subvol show' command is invoked with '-q', so there is no
output.

As btrfs quotas are currently not implemented, die early with a clean
error instead and comment out the unused code for now.

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Link: https://lore.proxmox.com/20250303092445.13873-6-f.ebner@proxmox.com
This commit is contained in:
Fiona Ebner
2025-03-03 10:24:45 +01:00
committed by Thomas Lamprecht
parent 0426aa3165
commit 5a73bac343
1 changed files with 16 additions and 12 deletions
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28
src/PVE/Storage/BTRFSPlugin.pm
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@ -233,14 +233,15 @@ sub btrfs_cmd {
return $msg;
}
sub btrfs_get_subvol_id {
my ($class, $path) = @_;
my $info = $class->btrfs_cmd(['subvolume', 'show', '--', $path]);
if ($info !~ /^\s*(?:Object|Subvolume) ID:\s*(\d+)$/m) {
die "failed to get btrfs subvolume ID from: $info\n";
}
return $1;
}
# NOTE: this function is currently boken, because btrfs_cmd uses '-q' so there will be no output.
#sub btrfs_get_subvol_id {
# my ($class, $path) = @_;
# my $info = $class->btrfs_cmd(['subvolume', 'show', '--', $path]);
# if ($info !~ /^\s*(?:Object|Subvolume) ID:\s*(\d+)$/m) {
# die "failed to get btrfs subvolume ID from: $info\n";
# }
# return $1;
#}
my sub chattr : prototype($$$) {
my ($fh, $mask, $xor) = @_;
@ -498,10 +499,13 @@ sub volume_resize {
my $format = ($class->parse_volname($volname))[6];
if ($format eq 'subvol') {
my $path = $class->filesystem_path($scfg, $volname);
my $id = '0/' . $class->btrfs_get_subvol_id($path);
$class->btrfs_cmd(['qgroup', 'limit', '--', "${size}k", "0/$id", $path]);
return undef;
# NOTE: `btrfs send/recv` actually drops quota information so supporting subvolumes with
# quotas doesn't play nice with send/recv.
die "cannot resize subvolume - btrfs quotas are currently not supported\n";
# my $path = $class->filesystem_path($scfg, $volname);
# my $id = '0/' . $class->btrfs_get_subvol_id($path);
# $class->btrfs_cmd(['qgroup', 'limit', '--', "${size}k", "0/$id", $path]);
# return undef;
}
return PVE::Storage::Plugin::volume_resize(@_);