From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin-patches@cygwin.com
Subject: Re: [PATCH] Cygwin: Add /dev/disk/by-drive and /dev/disk/by-uuid symlinks
Date: Thu, 16 Nov 2023 11:36:13 +0100 [thread overview]
Message-ID: <ZVXwnUgd3UnIqBQf@calimero.vinschen.de> (raw)
In-Reply-To: <5db42b33-ed93-2e7c-977a-89d407137d86@t-online.de>
Hi Christian,
On Nov 15 18:23, Christian Franke wrote:
> This is the next (and possibly last for now) extension to the /dev/disk
> directory. Limited to disk related entries which allowed a straightforward
> extension of the existing code.
>
> My original idea was to add also other drive letters and volume GUIDs. Too
> complex for now.
>
> Interestingly the volume GUID (by-uuid) for partitions on MBR disks is
> sometimes identical to the partition "GUID" (by-partuuid), sometimes (always
> for C:?) not. With GPT disks, both GUIDs are possibly always identical.
That looks great, but in terms of by-uuid, I'm not sure it's the
right thing to do. On Linux I have a vfat partition (/boot/efi).
The uuid in /dev/disk/by-uuid is the volume serial number, just
with an extra dash, i.e.
057A-B3A7 -> ../../sda1
That's what you get for FAT/FAT32/exFAT.
I also tried an NTFS partition and the output looks like this:
0FD4F62866CFBF09 -> ../../sdc1
This is the 64 bit volume serial number as returned by
DeviceIoControl(FSCTL_GET_NTFS_VOLUME_DATA)(*).
Wouldn't that be what we want to see, too?
Thanks,
Corinna
(*) Incidentally the last 8 digits represent the crippled 4 byte
serial number returned by
NtQueryVolumeInformationFile(..., FileFsVolumeInformation).
next prev parent reply other threads:[~2023-11-16 10:36 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-15 17:23 Christian Franke
2023-11-16 10:36 ` Corinna Vinschen [this message]
2023-11-16 11:50 ` Christian Franke
2023-11-16 12:19 ` Corinna Vinschen
2023-11-16 17:02 ` Christian Franke
2023-11-17 12:11 ` Corinna Vinschen
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