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To: Proxmox VE development discussion <pve-devel@lists.proxmox.com>,
Maximiliano Sandoval <m.sandoval@proxmox.com>
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Subject: Re: [pve-devel] [PATCH storage 1/2] fix #3873: btrfs: check for
correct subvolume taking snapshot
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Am 09.07.24 um 13:51 schrieb Maximiliano Sandoval:
> Suppose we are doing a snapshot of disk 0 for VM 100. The
> dir_glob_foreach runs over $path=/subvolume/images/100, lists all
> snapshot names and appends their names to the path of the disk, e.g.
> /subvolume/images/vm-100-disk-0@SNAP_NAME, but the original directory
> $path might contain a second disk `vm-100-disk-1` which is also listed
> by the dir_glib_foreach.
>
> The patch skips images which reference other disks.
>
> Signed-off-by: Maximiliano Sandoval <m.sandoval@proxmox.com>
> ---
> src/PVE/Storage/BTRFSPlugin.pm | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/src/PVE/Storage/BTRFSPlugin.pm b/src/PVE/Storage/BTRFSPlugin.pm
> index 42815cb..dc0420d 100644
> --- a/src/PVE/Storage/BTRFSPlugin.pm
> +++ b/src/PVE/Storage/BTRFSPlugin.pm
> @@ -767,6 +767,9 @@ sub volume_export {
> push @$cmd, (map { "$path\@$_" } ($with_snapshots // [])->@*), $path;
> } else {
> dir_glob_foreach(dirname($path), $BTRFS_VOL_REGEX, sub {
I feel like this would be a bit nicer (and slightly more robust) if it
used foreach_subvol() and would check the basename like done in
free_image(). Or even better, introduce a new helper that iterates over
all snapshots of a specific volume to not repeat ourselves here and in
free_image(). Since foreach_subvol() is only used once (i.e. in
free_image()), we could even replace that. There's another pre-existing
thing that's a bit confusing, which is that BTRFS_VOL_REGEX only matches
snapshot volumes and not the actual volume itself AFAICS.
> + if (index($path, $_[1]) < 0) {
> + return
> + }
> push @$cmd, "$path\@$_[2]" if !(defined($snapshot) && $_[2] eq $snapshot);
> });
> }
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