mkstemp fails on cifs linux-2.6.31-rc1 / samba-3.3.6

Hi,

I made a simple test with cifs in linux-2.6.31-rc1 to see if the so called 
kmail-problem (cifs-user-homes are totally unusable for kmail-mail-cache) 
still remains. Than I ran into a strange problem using "sed -i <command> <file-
on-cifs>". "sed" uses mkstemp libc-funktion and fails with EEXIST, writing 
therefore tons of files onto the cifs-share.

You can reproduce it with:

strace mktemp -p . abcXXXXXX 2>&1 | more

giving

stat64(".", {st_mode=S_IFDIR|0700, st_size=0, ...}) = 0
open("./abcUJcKWM", O_RDWR|O_CREAT|O_EXCL, 0600) = -1 EEXIST (File exists)
stat64(".", {st_mode=S_IFDIR|0700, st_size=0, ...}) = 0
open("./abcUGJaiA", O_RDWR|O_CREAT|O_EXCL, 0600) = -1 EEXIST (File exists)
stat64(".", {st_mode=S_IFDIR|0700, st_size=0, ...}) = 0
open("./abcWfKacs", O_RDWR|O_CREAT|O_EXCL, 0600) = -1 EEXIST (File exists)
stat64(".", {st_mode=S_IFDIR|0700, st_size=0, ...}) = 0
open("./abcBaGjWM", O_RDWR|O_CREAT|O_EXCL, 0600) = -1 EEXIST (File exists)

This is the same on 2.6.31-rc1-git6.

This is not the case in 2.6.26-2-vserver-686 (debian).

The Samba-Server is lenny with samba-enterprise:
kmux-fs:/# dpkg -l | grep samba
ii  sernet-samba                    3.3.6-24                 a LanManager-like 
file and printer server fo
ii  sernet-samba-common             3.3.6-24                 Samba common files 
used by both the server a
ii  sernet-samba-keyring            1.1                      GnuPG archive 
keys of the SerNet Samba archi

If I change Samba to the lenny-version

ii  samba                           2:3.2.5-4lenny6          a LanManager-like 
file and printer server fo
ii  samba-common                    2:3.2.5-4lenny6          Samba common files 
used by both the server a

the described test-case is fine.


-- 
Wilhelm