Date: Tue, 10 Jun 1997 12:39:48 +0200 From: Gilles Bruno <Gilles.Bruno@ujf-grenoble.fr> To: hackers@freebsd.org, Gilles.Bruno@ujf-grenoble.fr Subject: mmap() question... Message-ID: <2.2.32.19970610103948.008c4cdc@adm.ujf-grenoble.fr>
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Hi everyone !
(here we go for some kind of newbie question...)
I tried -for testing purpose- to implement the FAST_SHARE_MODE feature of
samba-1.9.16p11 on a FreeBSD 2.2.2-Release box. This implies the use of
both mmap() and lockf() systems calls.
After doing some minimal hacking in the samba source tree (mainly to replace
sysV lockf() call with the bsd's flock() in shmem.c) I managed to get it work.
*BUT* when I took a look in the (standard) /usr/local/samba/var/lock where the
shared mem file resides, I found the following :
{423}Root /bin/ls -a -l /usr/local/samba/var/locks
total 60
drwxr-xr-x 2 root wheel 512 Jan 28 11:19 .
drwxr-xr-x 3 root wheel 512 Jan 28 11:36 ..
-rw-rw-rw- 1 root wheel 102400 Jan 28 11:26 SHARE_MEM_FILE
-rw-rw-rw- 1 root wheel 4294967304 Jan 28 12:04
SHARE_MEM_FILE.processes
^^^^^^^^^^
-rw-r--r-- 1 root wheel 200 Jan 28 12:04 STATUS..LCK
-rw-r--r-- 1 root wheel 77 Jan 28 11:19 browse.dat
-rw-r--r-- 1 root wheel 0 Jan 28 11:19 wins.dat
Hike ! What's that ?
{425}Root /usr/bin/du /usr/local/samba/var/locks
59 /usr/local/samba/var/locks
{426}Root /usr/bin/du
/usr/local/samba/var/locks/SHARE_MEM_FILE.processes
32 /usr/local/samba/var/locks/SHARE_MEM_FILE.processes
I presume that the size of the "SHARE_MEM_FILE.processes" (4Gb !)
reflects some sort of maximum addressable memory, isn't it ?
It would disturb me, if this directory had to be BACKED UP (using
dump/amanda)...
(I presume it wouldn't hurt since the real amount of space taken by this
file is 32k,
but if the dump use the same 'stat' method the /bin/ls does it would... No ?)
The same question also applies to the /stand directory wich contains gzip
executables
(whose size is 1064960 bytes...)
----------------------------------------------------------------------------
----------
Resume :
. am I correct in my assertions / the size of this particular file
. is the output of the ls command 'normal' ?
. will this 'odditie' disturb either dump or tar (I'm concerned/anxious
about 'tar')
PS. Oops. Look's like I haven't set the time zone of this test box yet...
Don't blame my poor english...
--
Gilles BRUNO
Universite Joseph Fourier - CRIP
Domaine Universitaire 38041 St Martin d'Heres FRANCE
Tel (33) 04 76 63 56 68 Fax (33) 04 76 51 42 74
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