[Mysqlfs-general] Some questions.

[Stef B. <st...@bo...>]

Hello,

earlier I've posted a message in this list.
I've mentioned the "multithreading (im)possibilities" of mysqlfs. I thought
mysqlfs does not support multithreading. Just recent I've discovered that it
does. At least, it's possible to make use of the same mountpoint by more 
users
the same time.

I would like to investigate it's possible to add support for 
"maintaining versions of files and directories".
I think this is very possible because it's in a database. But first I'm 
trying to understand how mysqlfs
works. So I've got some questions. If anyone would be so kind to answer 
them.

First the overwriting of a file by another smaller one. This makes
(if both files differ much in size and both are big enough) that 
datablocks will be deleted. I've been searching the
sourcecode, but cannot find out how this works exactly. So before a file 
is written, there should be a procedure which
checks the file already exits, and removes the datablocks which will not 
be used. Is this right? If so, where can I find this
in the sourcecode?


Stef Bon