Ext3 users - Jul 2006 - chattr +T not implemented?

We run a third party application that creates an inordinate amount of 
subdirectories in a single directory.  To speed up I/O, I wanted to set 
the T attribute on the directory that will hold the subdirectories.  The 
"chattr +T /usr/local/lepus-bb/a-0607" command returns status 0, but 
when I verify the setting, the attribute isn't there:

   # lsattr -d /usr/local/lepus-bb/a-0607
   ------------- /usr/local/lepus-bb/a-0607

Is this attribute implemented?  The manual pages entry for chattr 
suggests it is, but when I check the chattr usage, "T" isn't
listed:

   #chattr -v
   usage: chattr [-RV] [-+=AacDdijsSu] [-v version] files...

FWIIW
   # cat /proc/version
   Linux version 2.4.21-40.ELsmp (bhcompile at hs20-bc1-7.build.redhat.com)
   (gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-54)) #1 SMP Thu Feb 2
   22:22:39 EST 2006

Kind regards,

Herta

Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm

On Mon, Jul 10, 2006 at 12:29:50PM +0200, Herta Van den Eynde
wrote:
> Is this attribute implemented?  The manual pages entry for chattr 
> suggests it is, but when I check the chattr usage, "T" isn't
listed:
> 
>   #chattr -v
>   usage: chattr [-RV] [-+=AacDdijsSu] [-v version] files...
> 
> FWIIW
>   # cat /proc/version
>   Linux version 2.4.21-40.ELsmp (bhcompile at hs20-bc1-7.build.redhat.com)
>   (gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-54)) #1 SMP Thu Feb 2
>   22:22:39 EST 2006
To quote from the man page:

       A  directory  with    attribute will be deemed to be the top of
       directory hierarchies for the purposes of  the  Orlov  block  allocator
       (which is used in on systems with Linux 2.5.46 or later).

You're using Linux version 2.4.21....

							- Ted

On Jul 10, 2006  12:29 +0200, Herta Van den Eynde wrote:
> We run a third party application that creates an inordinate amount of 
> subdirectories in a single directory.  To speed up I/O, I wanted to set 
> the T attribute on the directory that will hold the subdirectories.  The 
> "chattr +T /usr/local/lepus-bb/a-0607" command returns status 0,
but
> when I verify the setting, the attribute isn't there:
> 
>   # lsattr -d /usr/local/lepus-bb/a-0607
>   ------------- /usr/local/lepus-bb/a-0607
> 
> Is this attribute implemented?  The manual pages entry for chattr 
> suggests it is, but when I check the chattr usage, "T" isn't
listed:
> 
>   #chattr -v
>   usage: chattr [-RV] [-+=AacDdijsSu] [-v version] files...
man chattr(1) reports:
	A  directory  with  the  ?T? attribute will be deemed to be the top of
	directory hierarchies for the purposes of the  Orlov  block allocator
	(which is used in on systems with Linux 2.5.46 or later).`

You can also check with "debugfs -c -R 'stat lepus-bb/a-0607'
/dev/XXXX"
(assuming /usr/local/ is the mountpoint).  It may be that the kernel is
not allowing the T attribute in the EXT3_FL_USER_VISIBLE mask, though it
does show correctly in my kernel.

#define EXT3_TOPDIR_FL                  0x00020000 /* Top of directory
hierarchies*/
#define EXT3_FL_USER_VISIBLE            0x0003DFFF /* User visible flags */


Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.