From: "Fabian Grünbichler" <f.gruenbichler@proxmox.com>
To: Proxmox VE development discussion <pve-devel@lists.proxmox.com>
Cc: Wolfgang Bumiller <w.bumiller@proxmox.com>
Subject: Re: [pve-devel] [PATCH storage] btrfs: check for btrfs in on_add_hook and activate
Date: Thu, 24 Jun 2021 09:56:58 +0200 [thread overview]
Message-ID: <1624521156.jnauh4rg8d.astroid@nora.none> (raw)
In-Reply-To: <20210624072920.43336-1-w.bumiller@proxmox.com>
On June 24, 2021 9:29 am, Wolfgang Bumiller wrote:
> Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
> ---
> PVE/Storage/BTRFSPlugin.pm | 30 ++++++++++++++++++++++++++++++
> 1 file changed, 30 insertions(+)
>
> diff --git a/PVE/Storage/BTRFSPlugin.pm b/PVE/Storage/BTRFSPlugin.pm
> index 133edc6..0e111a0 100644
> --- a/PVE/Storage/BTRFSPlugin.pm
> +++ b/PVE/Storage/BTRFSPlugin.pm
> @@ -20,6 +20,7 @@ use constant {
> FS_NOCOW_FL => 0x00800000,
> FS_IOC_GETFLAGS => 0x40086602,
> FS_IOC_SETFLAGS => 0x80086601,
> + BTRFS_MAGIC => 0x9123683e,
> };
>
> # Configuration (similar to DirPlugin)
> @@ -89,8 +90,29 @@ sub check_config {
> return PVE::Storage::DirPlugin::check_config($self, $sectionId, $config, $create, $skipSchemaCheck);
> }
>
> +my sub getfsmagic($) {
> + my ($path) = @_;
> + # The field type sizes in `struct statfs` are defined in a rather annoying way, and we only
> + # need the first field, which is a `long` for our supported platforms.
> + # Should be moved to pve-rs, so this can be the problem of the `libc` crate ;-)
> + # Just round up and extract what we need:
> + my $buf = pack('x160');
> + if (0 != syscall(&PVE::Syscall::SYS_statfs, $path, $buf)) {
> + die "statfs on '$path' failed - $!\n";
> + }
> +
> + return unpack('L!', $buf);
> +}
> +
> +my sub assert_btrfs($) {
> + my ($path) = @_;
> + die "'$path' is not a btrfs file system\n"
> + if getfsmagic($path) != BTRFS_MAGIC;
> +}
> +
> sub activate_storage {
> my ($class, $storeid, $scfg, $cache) = @_;
> + assert_btrfs($scfg->{path});
> return PVE::Storage::DirPlugin::activate_storage($class, $storeid, $scfg, $cache);
shouldn't this be the other way round? first check for things like
is_mountpoint, then whether btrfs is there.. makes for less confusing
error message at least..
> }
>
> @@ -179,6 +201,14 @@ sub btrfs_cmd {
> return $msg;
> }
>
> +sub on_add_hook {
> + my ($class, $storeid, $scfg, %param) = @_;
> +
> + assert_btrfs($scfg->{path});
not needed - adding a new storage calls activate_storage if the storage
is enabled..
> +
> + return;
> +}
> +
> sub btrfs_get_subvol_id {
> my ($class, $path) = @_;
> my $info = $class->btrfs_cmd(['subvolume', 'show', '--', $path]);
> --
> 2.30.2
>
>
>
> _______________________________________________
> pve-devel mailing list
> pve-devel@lists.proxmox.com
> https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
>
>
>
next prev parent reply other threads:[~2021-06-24 7:57 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-24 7:29 Wolfgang Bumiller
2021-06-24 7:56 ` Fabian Grünbichler [this message]
2021-06-24 8:43 ` Wolfgang Bumiller
2021-06-24 9:10 ` Thomas Lamprecht
2021-06-24 9:23 ` Fabian Grünbichler
2021-06-24 9:27 ` Thomas Lamprecht
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