[Pkg-samba-maint] Bug#639364: samba: Cached and uncached file attributes have distinct timestamps

[Cyril Bouthors]

Package: samba
Version: 2:3.5.11~dfsg-1~bpo60+1
Severity: important

Cached and uncached file attributes have distinct timestamps under CIFS.

Here is a way to reproduce the issue with a CIFS/ext3 export:

# touch x; ls --full-time x; sleep 1; ls --full-time x
-rw-rw-rw- 1 atn atn 0 2011-08-26 13:32:13.330511809 +0200 x
-rw-rw-rw- 1 atn atn 0 2011-08-26 13:32:13.000000000 +0200 x
                                           ^^^^^^^^^
If I run the same CIFS configuration with an ext4 filesystem, the timestamps are
now almost the same but there is still a 67ns difference:

# touch x; ls --full-time x; sleep 1; ls --full-time x
-rw-rw-rw- 1 atn atn 0 2011-08-26 14:02:23.511864967 +0200 x
-rw-rw-rw- 1 atn atn 0 2011-08-26 14:02:23.511864900 +0200 x
                                                  ^^
On a ext4 FS without CIFS, it just works:
# touch x; ls --full-time x; sleep 1; ls --full-time x
-rw-r--r-- 1 cyb cyb 0 2011-08-26 14:25:42.311759806 +0200 x
-rw-r--r-- 1 cyb cyb 0 2011-08-26 14:25:42.311759806 +0200 x

Timestamps should remain the same whatever the cache status is. It breaks many
applications like Emacs, Gedit, Eclipse because they complain about file
modifications.

This is closely related to http://bugs.debian.org/366940 but not the same, it's
rather quite the opposite.

Same issue with samba/squeeze and samba/squeeze-backports.

Would it be possible to fix it?

Best regards,

-- System Information:
Debian Release: 6.0.2
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-5-amd64 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages samba depends on:
ii  adduser          3.112+nmu2              add and remove users and groups
ii  debconf [debconf 1.5.36.1                Debian configuration management sy
ii  libacl1          2.2.49-4                Access control list shared library
ii  libattr1         1:2.4.44-2              Extended attribute shared library
ii  libc6            2.11.2-10               Embedded GNU C Library: Shared lib
ii  libcap2          1:2.19-3                support for getting/setting POSIX.
ii  libcomerr2       1.41.12-4stable1        common error description library
ii  libcups2         1.4.4-7                 Common UNIX Printing System(tm) -
ii  libgssapi-krb5-2 1.8.3+dfsg-4squeeze1    MIT Kerberos runtime libraries - k
ii  libk5crypto3     1.8.3+dfsg-4squeeze1    MIT Kerberos runtime libraries - C
ii  libkrb5-3        1.8.3+dfsg-4squeeze1    MIT Kerberos runtime libraries
ii  libldap-2.4-2    2.4.23-7.2              OpenLDAP libraries
ii  libpam-modules   1.1.1-6.1               Pluggable Authentication Modules f
ii  libpam-runtime   1.1.1-6.1               Runtime support for the PAM librar
ii  libpam0g         1.1.1-6.1               Pluggable Authentication Modules l
ii  libpopt0         1.16-1                  lib for parsing cmdline parameters
ii  libtalloc2       2.0.1-1                 hierarchical pool based memory all
ii  libtdb1          1.2.1-2+b1              Trivial Database - shared library
ii  libwbclient0     2:3.5.11~dfsg-1~bpo60+1 Samba winbind client library
ii  lsb-base         3.2-23.2squeeze1        Linux Standard Base 3.2 init scrip
ii  procps           1:3.2.8-9               /proc file system utilities
ii  samba-common     2:3.5.11~dfsg-1~bpo60+1 common files used by both the Samb
ii  update-inetd     4.38+nmu1               inetd configuration file updater
ii  zlib1g           1:1.2.3.4.dfsg-3        compression library - runtime

Versions of packages samba recommends:
ii  logrotate                     3.7.8-6    Log rotation utility
ii  tdb-tools                     1.2.1-2+b1 Trivial Database - bundled binarie

Versions of packages samba suggests:
pn  ctdb                          <none>     (no description available)
pn  ldb-tools                     <none>     (no description available)
pn  openbsd-inetd | inet-superser <none>     (no description available)
pn  smbldap-tools                 <none>     (no description available)

-- debconf information:
  samba/run_mode: daemons
  samba/generate_smbpasswd: true
  samba-common/title:
-- 
 ,''`.
: :' :      Cyril Bouthors
`. `'         Debian.org
  `-