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Subject:	Re: how about little improve "stat" function for virtual cloned drisk
	on windows ?
To:	cygwin AT cygwin DOT com
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From:	Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Organization:	Systematic Software
Message-ID:	<2f399a0f-6715-1e27-223c-397d7b0d590f@SystematicSw.ab.ca>
Date:	Thu, 29 Apr 2021 10:04:35 -0600
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On 2021-04-29 09:29, dreverser--- via Cygwin wrote:
> hello, i have issue for using stat for virtual cloned disk on windows/vmware
> st_dev give me the the same serial number
> and diff util doest work, because thinking path the same and there are
> no files for diff
> 
> iam propose improve winsup\cygwin\mount.c
> by add disk letter to st_dev
> 
> at this line
> https://github.com/cygwin/cygwin/blob/367c1ae16185e7a81aea5bcc2388e4a7a473c92e/winsup/cygwin/mount.cc#L266
> 
> sernum = ffvi_buf.ffvi.VolumeSerialNumber;
> 
> after add disk letter to sernum
> stat will give more unique st_dev
> and as less diff will work

To provide more information, please run and post results of commands below: e.g.

$ head /proc/version
CYGWIN_NT-10.0-19042 version 3.2.0-340.x86_64 (corinna AT calimero) (gcc version 
9.3.0 20200312 (Fedora Cygwin 9.3.0-1) (GCC) ) 2021-03-29 08:42 UTC
$ stat /proc/cygdrive/?
   File: /proc/cygdrive/c
   Size: 0               Blocks: 8          IO Block: 65536  directory
Device: ee454341h/3997516609d   Inode: 1407374883553285  Links: 1
Access: (0050/d---r-x---)  Uid: (328384/NT SERVICE+TrustedInstaller)   Gid: 
(328384/NT SERVICE+TrustedInstaller)
Access: 2021-04-29 10:00:59.850885200 -0600
Modify: 2021-04-24 21:37:53.292164400 -0600
Change: 2021-04-24 21:37:53.292164400 -0600
  Birth: 2019-03-18 22:37:21.986161300 -0600
   File: /proc/cygdrive/d
   Size: 0               Blocks: 8          IO Block: 65536  directory
Device: 6b8d438h/112776248d     Inode: 1407374883553285  Links: 1
Access: (0050/d---r-x---)  Uid: (328384/NT SERVICE+TrustedInstaller)   Gid: 
(328384/NT SERVICE+TrustedInstaller)
Access: 2021-04-24 15:14:10.005696600 -0600
Modify: 2021-04-24 15:14:10.005696600 -0600
Change: 2021-04-24 15:14:10.005696600 -0600
  Birth: 2009-07-13 20:38:56.526817600 -0600

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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