bug#32520: 26.1; problem with CIFS mounts

bug#32520: 26.1; problem with CIFS mounts

[emacs]

I automount windows shares under a common mountpoint, say /cifs.

When I cd to or references something like:
  /cifs/<host>/<share>/path/to/file_or_dir
the windows share is mounted on
  /cifs/<host>/<share>
and the process can get to .../path/to/file_or_dir.

When I visit one of those directories with emacs 26 (maybe
also files on that share), I get a bunch of syslog warnings
from the CIFS subsystem.

Sometimes they just say:

  [608270.512407] CIFS VFS: BAD_NETWORK_NAME: \\host\.dir-locals-2.el
  [608270.512744] CIFS VFS: cifs_mount failed w/return code = -2
  [608270.517939] CIFS VFS: BAD_NETWORK_NAME: \\host\.dir-locals.el
  [608270.518326] CIFS VFS: cifs_mount failed w/return code = -2

Other times it goes full looking for more stuff, like:

  [600979.586694] CIFS VFS: BAD_NETWORK_NAME: \\host\.dir-locals-2.el
  [600979.587097] CIFS VFS: cifs_mount failed w/return code = -2
  [600979.597115] CIFS VFS: BAD_NETWORK_NAME: \\host\.dir-locals.el
  [600979.597598] CIFS VFS: cifs_mount failed w/return code = -2
  [600979.611685] CIFS VFS: BAD_NETWORK_NAME: \\host\.svn
  [600979.612153] CIFS VFS: cifs_mount failed w/return code = -2
  [600979.638103] CIFS VFS: BAD_NETWORK_NAME: \\host\.bzr
  [600979.638532] CIFS VFS: cifs_mount failed w/return code = -2
  [600979.648746] CIFS VFS: BAD_NETWORK_NAME: \\host\.git
  [600979.649193] CIFS VFS: cifs_mount failed w/return code = -2
  [600979.664967] CIFS VFS: BAD_NETWORK_NAME: \\host\.hg
  [600979.665430] CIFS VFS: cifs_mount failed w/return code = -2
  [600979.664967] CIFS VFS: BAD_NETWORK_NAME: \\host\_MTN
  [600979.665430] CIFS VFS: cifs_mount failed w/return code = -2

I don't remember this happening for emacs 25.x.

It is clogging my syslog with bogus messages, as I do visit
lots of files and directories on remote windows share every
day.

-- Henrique

------------------------------------------------------------

In GNU Emacs 26.1 (build 1, x86_64-redhat-linux-gnu, GTK+ Version 3.22.30)
 of 2018-06-26 built on buildhw-10.phx2.fedoraproject.org
Windowing system distributor 'Fedora Project', version 11.0.11906000
System Description:	Fedora release 28 (Twenty Eight)

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bug#32520: 26.1; problem with CIFS mounts

[Glenn Morris]

Does it help to add /cifs to locate-dominating-stop-dir-regexp?
Something like net\\|afs -> net\\|afs\\|cifs 

bug#32520: 26.1; problem with CIFS mounts

[emacs]

> Does it help to add /cifs to locate-dominating-stop-dir-regexp?
> Something like net\\|afs -> net\\|afs\\|cifs 

Doesn't seem to, if I did it correctly.

My locate-dominating-stop-dir-regexp was:
  "\\`\\(?:[\\/][\\/][^\\/]+[\\/]\\|/\\(?:net\\|afs\\|\\.\\.\\.\\)/\\)\\'"
and I made it be:
  "\\`\\(?:[\\/][\\/][^\\/]+[\\/]\\|/\\(?:net\\|cifs\\|afs\\|\\.\\.\\.\\)/\\)\\'"

I've tried it in my current emacs session, and on a new
emacs -Q -nw session.

I do nfs mounts under /net, and visiting files or
directories under that don't log any errors.

-- Henrique

bug#32520: 26.1; problem with CIFS mounts

[Eli Zaretskii]

> From: emacs@martins.cc
> Date: Fri, 24 Aug 2018 09:24:45 -0700
> 
> I automount windows shares under a common mountpoint, say /cifs.
> 
> When I cd to or references something like:
>   /cifs/<host>/<share>/path/to/file_or_dir
> the windows share is mounted on
>   /cifs/<host>/<share>
> and the process can get to .../path/to/file_or_dir.
> 
> When I visit one of those directories with emacs 26 (maybe
> also files on that share), I get a bunch of syslog warnings
> from the CIFS subsystem.
> 
> Sometimes they just say:
> 
>   [608270.512407] CIFS VFS: BAD_NETWORK_NAME: \\host\.dir-locals-2.el
>   [608270.512744] CIFS VFS: cifs_mount failed w/return code = -2
>   [608270.517939] CIFS VFS: BAD_NETWORK_NAME: \\host\.dir-locals.el
>   [608270.518326] CIFS VFS: cifs_mount failed w/return code = -2

I guess Emacs tries to go up the directory tree too far, it should
stop at /cifs/<host>/<share/.  But how should it know it isn't
supposed to go up from /cifs/<host>/<share/ ?

> It is clogging my syslog with bogus messages, as I do visit
> lots of files and directories on remote windows share every
> day.

Does it cause any other trouble?

bug#32520: 26.1; problem with CIFS mounts

[emacs]

> I guess Emacs tries to go up the directory tree too far,
> it should stop at /cifs/<host>/<share/. But how should it
> know it isn't supposed to go up from /cifs/<host>/<share>/ ?

Maybe with a variable (regexp) I could customize.

It could also tell by looking at the mount points, but
that's too time consuming.

>> It is clogging my syslog with bogus messages, 
> Does it cause any other trouble?

No.

It is just annoying litter, that I may be able to filter.

-- Henrique

bug#32520: 26.1; problem with CIFS mounts

[Glenn Morris]

Maybe you need "\\`/cif/[^/]+/[^/]+/\\'" or some other variant.
I think that is the right variable, but you may need to experiment to
find the correct setting.

bug#32520: 26.1; problem with CIFS mounts

[emacs]

> Maybe you need "\\`/cif/[^/]+/[^/]+/\\'" or some other
> variant.  I think that is the right variable, but you may
> need to experiment to find the correct setting.

That variable is defined in files.el as (minus the doc string):

(defvar locate-dominating-stop-dir-regexp
  (purecopy "\\`\\(?:[\\/][\\/][^\\/]+[\\/]\\|/\\(?:net\\|afs\\|\\.\\.\\.\\)/\\)\\'"))

I added this to my init, and executed:

(setq locate-dominating-stop-dir-regexp
  (purecopy "\\`\\(?:[\\/][\\/][^\\/]+[\\/]\\|[\\/]smb[\\/][^\\/]+[\\/][^\\/]+[\\/]\\|/\\(?:net\\|afs\\|\\.\\.\\.\\)/\\)\\'"))

Now the warnings about .dir-locals-2.el and .dir-locals.el
no longer show.  These used to show when visiting
directories.

However the warnings for \\<host>\{.bzr,git,.hg,.svn} are
still there when visiting files.  These seem to be
referenced in a few files, but because I've seen _MTN a
couple of times it may come from one of these

  vc/vc-hooks.el.gz
  vc/add-log.el.gz

Not sure yet how to shut those up.

-- Henrique

------------------------------------------------------------

On a side note
Why does this, the default  setting
  (purecopy "\\`\\(?:[\\/][\\/][^\\/]+[\\/]\\|/\\(?:net\\|afs\\|\\.\\.\\.\\)/\\)\\'"))
escape / as [\\/] for the first case
  //[^/]+/
but not for the second
 /[net|afs|...]/
?

  

bug#32520: 26.1; problem with CIFS mounts

[Noam Postavsky]

On 24 August 2018 at 17:20,  <emacs@martins.cc> wrote:

> However the warnings for \\<host>\{.bzr,git,.hg,.svn} are
> still there when visiting files.

I think you want to set vc-ignore-dir-regexp (to the same value as
locate-dominating-stop-dir-regexp) for this.

> On a side note
> Why does this, the default  setting
>   (purecopy "\\`\\(?:[\\/][\\/][^\\/]+[\\/]\\|/\\(?:net\\|afs\\|\\.\\.\\.\\)/\\)\\'"))
> escape / as [\\/] for the first case

Backslashes don't escape (at the regexp level) inside square brackets,
[\\/] just matches / or \. If it was written [/\\] it would mean the
same.

Perhaps translating to rx syntax would make it clearer:

(sequence string-start
          (or
           (sequence
            (any "/" "\\")
            (any "/" "\\")
            (one-or-more
             (not
              (any "/" "\\")))
            (any "/" "\\"))
           (sequence "/"
                     (or "net" "afs" "...")
                     "/"))
          string-end)

bug#32520: 26.1; problem with CIFS mounts

[emacs]

> I think you want to set vc-ignore-dir-regexp (to the same value as
> locate-dominating-stop-dir-regexp) for this.

Yup, that does it, thanks!

I thought I had done something similar for XEmacs a long
time ago, but couldn't find it in my old XEmacs setup files.

I also don't recall this being a problem with Emacs < 26.

Thanks again,

-- Henrique