bug#11823: tail: unrecognized file system type 0x61756673 for ‘/var/log/messages’. please report this to address@hidden reverting to polling

[Jim Meyering]

Michael Mol wrote:
> "tail: unrecognized file system type 0x61756673 for
> ‘/var/log/messages’. please report this to address@hidden
> reverting to polling"
>
> At the time, mount indicated the filesystem in question was aufs.
>
> The manpage for aufs shows a description of it: "aufs - advanced multi
> layered unification filesystem. version 3.3-20120326"
>
> This was on the Gentoo 12.1 liveDVD.

Thank you!
Here's the patch I expect to push soon:

>From b0d8d3242998852e1a8a58b3f1b48186ad1063ec Mon Sep 17 00:00:00 2001
From: Jim Meyering <address@hidden>
Date: Sat, 30 Jun 2012 18:19:53 +0200
Subject: [PATCH] stat,tail: recognize new file system type: aufs

* src/stat.c (human_fstype) [__linux__]: Add a 'case' for the new
remote file system type: aufs (0x61756673).
* NEWS (New features): Mention stat -f.
(Bug fixes): Mention it for tail -f.
Reported by Michael Mol in http://bugs.gnu.org/11823
---
 NEWS       | 4 ++--
 THANKS.in  | 1 +
 src/stat.c | 5 +++++
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/NEWS b/NEWS
index 8c75a32..be98796 100644
--- a/NEWS
+++ b/NEWS
@@ -25,13 +25,13 @@ GNU coreutils NEWS                                    -*- 
outline -*-
   in all situations on GNU/Linux, by correctly determining the block size.
   [df bug since coreutils-5.0.91, stat bug since the initial implementation]

-  tail -f no longer tries to use inotify on PanFS file systems
+  tail -f no longer tries to use inotify on AUFS or PanFS file systems
   [you might say this was introduced in coreutils-7.5, along with inotify
    support, but even now, its magic number isn't in the usual place.]

 ** New features

-  stat -f recognizes the new remote file system type, panfs.
+  stat -f recognizes the new remote file system types: aufs, panfs.

 ** Changes in behavior

diff --git a/THANKS.in b/THANKS.in
index 2bdeab5..2873594 100644
--- a/THANKS.in
+++ b/THANKS.in
@@ -422,6 +422,7 @@ Michael J. Croghan                  address@hidden
 Michael J. Daniel                   address@hidden
 Michael McFarland                   address@hidden
 Michael McLagan                     address@hidden
+Michael Mol                         address@hidden
 Michael Piefel                      address@hidden
 Michael Steffens                    address@hidden
 Michael Stutz                       address@hidden
diff --git a/src/stat.c b/src/stat.c
index 94b63f6..e56f1ff 100644
--- a/src/stat.c
+++ b/src/stat.c
@@ -249,6 +249,11 @@ human_fstype (STRUCT_STATVFS const *statfsbuf)
       return "afs";
     case S_MAGIC_ANON_INODE_FS: /* 0x09041934 local */
       return "anon-inode FS";
+    case S_MAGIC_AUFS: /* 0x61756673 remote */
+      /* FIXME: change syntax or add an optional attribute like "inotify:no".
+         The above is labeled as "remote" so that tail always uses polling,
+         but this isn't really a remote file system type.  */
+      return "aufs";
     case S_MAGIC_AUTOFS: /* 0x0187 local */
       return "autofs";
     case S_MAGIC_BEFS: /* 0x42465331 local */
--
1.7.11.1.104.ge7b44f1