[linux-cifs-client] mkstemp fails on cifs linux-2.6.31-rc1 / samba-3.3.6

[Jeff Layton]

On Tue, 2009-06-30 at 13:00 +0200, Wilhelm Meier wrote:
> 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.
> 
> 

I can reproduce this too.

Looks like another regression from the create-on-lookup patches. I
commented the relevant chunk out of cifs_lookup and that fixes the
issue.

Shirish, thoughts?

-- 
Jeff Layton <jlayton at redhat.com>