[Samba] WinNT offline file attribute
John E. Malmberg
wb8tyw at qsl.net
Thu Apr 25 19:59:22 GMT 2002
Damir Dezeljin wrote:
> John Malmberg wrote:
>> The SMBD process must not make files with the offline attribute
>> visible to clients that do not support it. This means that SMBD
>> must find out that information somehow.
> No. This isn't correct. It is HSM product's thing to do triger
> read/open/write events and then it can put processes (threads) which
> access files to sleep - HSM product must implement a kernel module
> that has to triger open,... events. Client that doesn't know
> anythink about offline attributes just try to open files to get file
That is exactly the problem. The Windows Explorer on the older
platforms will try to open files that are shelved. That will bog down
the shelving system.
> This is the second problem, because WinNT LANMAN server has a pool
> of processes and every connection to a LANMAN server got its own
> thread. This behaviour has its benefits - you can block an
> individual connection to LANMAN server whilest the second instance
> of Windows explorer on the same client can stil browse the share (it
> got its own thread) - samba asign 1 thread 1 client accessing a
> single share - this cause that if the thread is put to sleep,
> windows "hangs" until the thread is unsleeped (you can't start any
> other Windows explorer, nor you can't use a windows explorer which
> is already started) - workaraound is that you can close the three
> browsing window in Windows explorer and you can browse only the
> current folder.
I do not understand how any of this logic is relevant to the problem.
The reason that the Windows client causes a shelved file to be
inadvertantly opened is not important. The number of threads involved
is not important to the problem either.
SAMBA's being single threaded per process is a totally different issue
than the shelved attribute.
I can reproduce the problems that you are mentioning simply by putting a
CD-ROM changer on a Windows NT system. No network involved at all.
If one Explorer window has to wait for the CD-ROMs to switch, all
explorer windows will freeze until it is done.
wb8tyw at qsl.network
Personal Opinion Only
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