GNU bug report logs - #12461
tail: unrecognized file system type 0xbacbacbc

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From: Daniel Tschinder <daniel.tschinder <at> project-a.com>
To: Jim Meyering <jim <at> meyering.net>
Cc: 12461 <at> debbugs.gnu.org
Subject: bug#12461: unrecognized file system type 0xbacbacbc
Date: Sun, 23 Sep 2012 01:28:03 +0200

This patch does not seem to work.
I've tested to tail -f inside the vm and append from host. The initial error message is not shown, but also the file does not refresh. So all the appended changes to the file from the host, do not show up in the running tail-session in vm.

I did not test the other way round, as vmhgfs is only used inside the vm and for the host system Mac OS X 10.8 the shared path is normal mac filesystem.

So it seems inotify is not supported :(


Am 19.09.2012 um 22:07 schrieb Jim Meyering <jim <at> meyering.net>:

> Daniel Tschinder wrote:
>> this happens for me when i try to use tail on vmhgfs filesystem
>> (vmwares shared folder file system)
>> 
>> unrecognized file system type 0xbacbacbc for
>> /data/[.…..]/sql.log'. please report this to
>> bug-coreutils <at> gnu.org. reverting to polling
> 
> Thanks for the report.
> 
> This is becoming routine and mechanical enough that I've begun to
> script the patch process ;-)
> 
> At least this time, the NEWS entry is not mechanically added,
> since I'm adding to an existing one.
> 
> I've only read a little about vmhgfs, e.g.,
>  http://www.vmware.com/support/ws5/doc/ws_running_shared_folders.html
> and google showed me only two hits for that magic number, 0xbacbacbc.
> 
> With that, I'm not sure whether it is safe to tell tail
> to use inotify for files on a vmhgfs file system.  That
> decides the "local" vs. "remote" part in the patch below.
> I.e., if running tail -f with the patch below on a file FOO in a
> shared directory on the host, and a VM appends to FOO, will tail
> detect that?  How about the other way around?  I.e., run the tail -f
> command from the VM and append to FOO from the host?  If you can
> certify that both work, then I can use "local", as in the patch
> below.  If not, then I must use "remote", which will force tail -f
> to use polling rather than inotify for any file on a VMHGFS file system.
> 
> Please let us know.
> 
> Also, please check your name and email address as listed
> in the log and THANKS.in below.
> 
> From bf4fcfe29010512f50b430ef21ba3b5b5059220e Mon Sep 17 00:00:00 2001
> From: Jim Meyering <meyering <at> redhat.com>
> Date: Wed, 19 Sep 2012 21:52:05 +0200
> Subject: [PATCH] tail,stat: improve support for vmhgfs
> 
> Inotify-enable tail -f to use on vmhgfs file systems, and let
> stat -f --format=%T report the file system type name, "vmhgfs".
> * src/stat.c (human_fstype): Add a case: vmhgfs, 0xbacbacbc.
> * NEWS (Improvements): Mention it.
> * THANKS.in: Update.
> Reported by Daniel Tschinder in http://bugs.gnu.org/12461.
> ---
> NEWS       | 4 ++--
> THANKS.in  | 1 +
> src/stat.c | 2 ++
> 3 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/NEWS b/NEWS
> index 59a8510..2268565 100644
> --- a/NEWS
> +++ b/NEWS
> @@ -49,8 +49,8 @@ GNU coreutils NEWS                                    -*- outline -*-
>   but only with non-negative whole numbers, an increment of 1, and no
>   format-changing options.
> 
> -  stat and tail work better with ZFS and VZFS.  stat -f --format=%T now
> -  reports the file system type, and tail -f now uses inotify for files
> +  stat and tail work better with ZFS, VZFS and VMHGFS.  stat -f --format=%T
> +  now reports the file system type, and tail -f now uses inotify for files
>   on those file systems, rather than the default (for unknown file system
>   types) of issuing a warning and reverting to polling.
> 
> diff --git a/THANKS.in b/THANKS.in
> index b0061b3..0f06aa0 100644
> --- a/THANKS.in
> +++ b/THANKS.in
> @@ -139,6 +139,7 @@ Dan Pascu                           dan <at> services.iiruc.ro
> Daniel Bergstrom                    noa <at> melody.se
> Daniel P. Berrangé                  berrange <at> redhat.com
> Daniel Stavrovski                   d <at> stavrovski.net
> +Daniel Tschinder                    daniel.tschinder <at> project-a.com
> Dániel Varga                        danielv <at> axelero.hu
> Danny Levinson                      danny.levinson <at> overture.com
> Darrel Francis                      d.francis <at> cheerful.com
> diff --git a/src/stat.c b/src/stat.c
> index a9fb951..c343b5d 100644
> --- a/src/stat.c
> +++ b/src/stat.c
> @@ -413,6 +413,8 @@ human_fstype (STRUCT_STATVFS const *statfsbuf)
>       return "usbdevfs";
>     case S_MAGIC_V9FS: /* 0x01021997 local */
>       return "v9fs";
> +    case S_MAGIC_VMHGFS: /* 0xBACBACBC local */
> +      return "vmhgfs";
>     case S_MAGIC_VXFS: /* 0xA501FCF5 local */
>       return "vxfs";
>     case S_MAGIC_VZFS: /* 0x565A4653 local */
> --
> 1.7.12.1.382.gb0576a6

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