acl handling on delete (performance problem)

[Andrew Bartlett]

On Mon, 2004-07-26 at 02:15, Jure Peèar wrote:
> Hi all,
> 
> Since i didn't receive any replies on samba list, i'm posting again here.
> 
> I'm debugging a performance problem for a client. Needless to say, the
> organisation of their data is such that this problem is really annoying. 
> Here's the situation:
> 
> Samba 3.0.x PDC in a mixed 9x/nt/xp environment, using acls. When trying to
> delete a large number of folders from a folder, the 'preparing to delete'
> stage takes about half hour.
> 
> It's simple to repeat: set up samba pdc, join an xp client into the domain,
> map a share with some 4000 folders and try to delete them.
> 
> Strace of a smbd proccess in the 'preparing to delete' stage looks like
> this:
> 
> stat("/mnt/test/test/0220", {st_mode=S_IFDIR|0755, st_size=6, ...}) = 0
> gettimeofday({1090703949, 903367}, NULL) = 0
> stat("/mnt/test/test/0220", {st_mode=S_IFDIR|0755, st_size=6, ...}) = 0
> getxattr("/mnt/test/test/0220", "system.posix_acl_access", 0x11fffe940, 132)
> = -1 ENODATA (No data available)
> stat("/mnt/test/test/0220", {st_mode=S_IFDIR|0755, st_size=6, ...}) = 0
> getxattr("/mnt/test/test/0220", "system.posix_acl_default", 0x11fffe940,
> 132) = -1 ENODATA (No data available)
> stat("/mnt/test/test/0220", {st_mode=S_IFDIR|0755, st_size=6, ...}) = 0
> getxattr("/mnt/test/test/0220", "user.SAMBA_PAI", 0x1207f0aa0, 1024) = -1
> ENODATA (No data available)

So, what does the wire look like?  An ethereal trace would tell us if
the client was doing the lookups, or Samba is doing it on it's own
(which I doubt).

A hacked workaround might be 'nt act support = no' in your smb.conf.

Andrew Bartlett

-- 
Andrew Bartlett                                 abartlet at samba.org
Authentication Developer, Samba Team            http://samba.org
Student Network Administrator, Hawker College   abartlet at hawkerc.net
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