[Samba] How samba guarantee close-to-open consistency?

Ralph Boehme slow at samba.org
Thu Jun 23 14:37:32 UTC 2022

On 6/23/22 15:54, jie wang wrote:
> Yes, we implement a vfs module which has cache. And we want to get 
> attributes from cache when samba calls openat.

well, I guess the correct way to tackle this would be to let the 
*clients* do the caching with leases for file data and with directory 
leases for file metadata.

But if you really want to cache on the server side, you could signal all 
other smbds with a message to drop the cache when you process the close 
in your VFS module.

Another question would be which metadata your shooting for? stat info? 
DOS attributes? For the latter we have some design ideas to avoid the 
need to store an xattr with the DOS attributes for the default case.


Ralph Boehme, Samba Team                 https://samba.org/
SerNet Samba Team Lead      https://sernet.de/en/team-samba
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