[linux-cifs-client] CIFS renaming problem with KMail and dot files

[Juergen Pfennig]

Hi,
with debian etch kernel 2.6.18 and samba 3.0.23d using kde 3.3.5 

(1) kMail (via cifs unix-extensions-enabled share) produces strange
    files where the filename starts with "cifs" or ".cifs" followed
    by a decimal number. This is reproduceable.
(2) Under rare circumstances such files may be created with other
    software. I have no idea how to reproduce this.

Could this happen in a client side call like ...

  rename("/data/home/jpf/Profiles/Mail/.trash.index.temp", 
         "/data/home/jpf/Profiles/Mail/.trash.index")

if (a) the target exists and (b) the target is still open? 

Yours
Jürgen

Details ...

The symptom (here an "ls -il /home/jpf/Profiles/Mail" on the server):

41002 drwxr-x--- 7 jpf centauri  520 2007-01-04 20:37 .
11115 drwxrwx--- 6 jpf centauri  224 2006-12-06 17:09 ..
35369 drwx------ 5 jpf centauri  120 2007-01-04 20:37 drafts
25029 -rw-r----- 1 jpf centauri   33 2007-01-04 20:37 .drafts.index
28072 -rw-r----- 1 jpf centauri   33 2007-01-04 20:37 .drafts.index.ids
      ...
36195 drwx------ 5 jpf centauri  120 2007-01-04 20:37 trash
39845 -rw-r----- 1 jpf centauri 1429 2007-01-04 20:37 .trash.index
39843 -rw-r----- 1 jpf centauri   45 2007-01-04 20:37 .trash.index.ids

And after emptying kMails Trash folder ...

41002 drwxr-x--- 7 jpf centauri  544 2007-01-04 20:37 .
11115 drwxrwx--- 6 jpf centauri  224 2006-12-06 17:09 ..
39845 -rw-r----- 1 jpf centauri 1429 2007-01-04 20:37 cifs10d7      <-- HERE !
35369 drwx------ 5 jpf centauri  120 2007-01-04 20:37 drafts
25029 -rw-r----- 1 jpf centauri   33 2007-01-04 20:37 .drafts.index
28072 -rw-r----- 1 jpf centauri   33 2007-01-04 20:37 .drafts.index.ids
      ...
36195 drwx------ 5 jpf centauri  120 2007-01-04 20:37 trash
39844 -rw-r----- 1 jpf centauri   33 2007-01-04 20:37 .trash.index
39843 -rw-r----- 1 jpf centauri   33 2007-01-04 20:37 .trash.index.ids

What kMail does (excerpt from strace) ...

[pid 11022] lstat64("/data/home/jpf/Profiles/Mail/.trash.index.sorted", 
{st_mode=S_IFREG|0640, st_size=1005, ...}) = 0
[pid 11022] lstat64("/data/home/jpf/Profiles/Mail/.trash.index.ids", 
{st_mode=S_IFREG|0640, st_size=161, ...}) = 0
[pid 11022] lstat64("/data/home/jpf/Profiles/Mail/.trash.index", 
{st_mode=S_IFREG|0640, st_size=15937, ...}) = 0
[pid 11022] access("/data/home/jpf/Profiles/Mail/.trash.index", F_OK) = 0
[pid 11022] access("/data/home/jpf/Profiles/Mail/.trash.index.ids", F_OK) = 0
[pid 11022] lstat64("/data/home/jpf/Profiles/Mail/.trash.index.ids", 
{st_mode=S_IFREG|0640, st_size=161, ...}) = 0
[pid 11022] lstat64("/data/home/jpf/Profiles/Mail/.trash.index", 
{st_mode=S_IFREG|0640, st_size=15937, ...}) = 0
[pid 11022] open("/data/home/jpf/Profiles/Mail/.trash.index.ids", O_RDWR|
O_LARGEFILE) = 10
[pid 11022] access("/data/home/jpf/Profiles/Mail/.trash.index", F_OK) = 0
[pid 11022] lstat64("/data/home/jpf/Profiles/Mail/.trash.index", 
{st_mode=S_IFREG|0640, st_size=15937, ...}) = 0
[pid 11022] open("/data/home/jpf/Profiles/Mail/.trash.index", O_RDWR|
O_LARGEFILE) = 15
[pid 11022] utime("/data/home/jpf/Profiles/Mail/.trash.index", NULL) = 0
[pid 11022] utime("/data/home/jpf/Profiles/Mail/.trash.index.ids", NULL) = 0
[pid 11022] open("/data/home/jpf/Profiles/Mail/.trash.index.sorted", O_RDWR|
O_LARGEFILE) = 16
[pid 11022] unlink("/data/home/jpf/Profiles/Mail/.trash.index.sorted") = 0
[pid 11022] unlink("/data/home/jpf/Profiles/Mail/.trash.index.temp") = -1 
ENOENT (No such file or directory)
[pid 11022] open("/data/home/jpf/Profiles/Mail/.trash.index.temp", O_WRONLY|
O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = 16
[pid 11022] 
rename("/data/home/jpf/Profiles/Mail/.trash.index.temp", "/data/home/jpf/Profiles/Mail/.trash.index") 
= 0
[pid 11022] open("/data/home/jpf/Profiles/Mail/.trash.index", O_RDWR|
O_LARGEFILE) = 15
[pid 11022] utime("/data/home/jpf/Profiles/Mail/.trash.index", NULL) = 0
[pid 11022] utime("/data/home/jpf/Profiles/Mail/.trash.index.ids", NULL) = 0
[pid 11022] open("/data/home/jpf/Profiles/Mail/.trash.index.ids", O_RDWR|
O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = 16
[pid 11022] truncate64("/data/home/jpf/Profiles/Mail/.trash.index.ids", 33) = 
0
[pid 11022] utime("/data/home/jpf/Profiles/Mail/.trash.index", NULL) = 0
[pid 11022] utime("/data/home/jpf/Profiles/Mail/.trash.index.ids", NULL) = 0
[pid 11022] open("/data/home/jpf/Profiles/Mail/.trash.index.ids", O_RDWR|
O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = 10
[pid 11022] truncate64("/data/home/jpf/Profiles/Mail/.trash.index.ids", 33) = 
0

P.S.
I still remember that, some decades ago, MS-Dos Version 3 or 4 crashed when 
renaming open files.  Things do repeat!