Re: [NFS] Export especific file extension

[Rob Gardner <rob.gardner@hp.com>]

=46=E1bio Jr. wrote:
> Rob Gardner escreveu:
>  =20
>> F=E1bio Jr. wrote:
>>    =20
>>> Rob Gardner escreveu:
>>> =20
>>>      =20
>>>> F=E1bio Jr. wrote:
>>>>   =20
>>>>        =20
>>>>> Hello all.
>>>>>
>>>>> Is there a way to export only some specific file extensions from =
a=20
>>>>> directory, like exporting only the files in /home/fabio with the=20
>>>>> .jpg extension?
>>>>>      =20
>>>>>          =20
>>>> You could do this pretty easily by exporting a 'fuse' filesystem=20
>>>> layered on top of your home directory.
>>>>
>>>> Rob Gardner
>>>> HP
>>>>
>>>>    =20
>>>>        =20
>>> Thanks Rob for the reply,
>>>
>>> This means that if I use this FUSE, I can export via NFS only the=20
>>> file extension that I need? let me explain my problem, not really a=
=20
>>> problem, but a doubt.
>>>
>>> I have one storage that have my aplication files. This storage is=20
>>> mounted via NFS in my 3 aplication servers. Now I will put another=20
>>> server, to serve only static files (jpg,png,css,js basically), and=20
>>> though that maybe there is a way to export only these files from th=
e=20
>>> storage. The problem is that these files are not organized in=20
>>> diferent folders.
>>>
>>> Maybe my first question doesn't explained my real necessity, but yo=
ur=20
>>> answer will make me search a little more about FUSE.
>>>      =20
>> I think your first question explained your need clearly. FUSE is a=20
>> filesystem layer that lets you filter requests through a user progra=
m=20
>> such as a python script. So, for instance, every time a process open=
s=20
>> a file, a function is called in your script, and you can look at the=
=20
>> name of the file being opened, and there decide whether or not to=20
>> allow the file to be opened. I think this would solve your problem=20
>> easily. Though all the storage is "exported", only files with certai=
n=20
>> names (ie, *.jpg, etc) could be opened. You could also decide which=20
>> files get enumerated with readdir, etc.
>>
>> Rob Gardner
>> HP
>>
>>
>>    =20
> Oh yes, I think I didn't understand you answer.. but now all became=20
> clear in my mind. I'm afraid that using this solution maybe cause an=20
> increase on storage processor load, because for every request the scr=
ipt=20
> must be executed. I already have some issues with server availability=
,=20
> and perhaps the solution of a problem becomes the worsening of anothe=
r.
>
> Still thanks for the reply and thanks for helping to clear my mind.

It's a valid concern, but fuse does not "execute a script" for every=20
operation. The script is always running, sort of like a server for the=20
pseudo-filesystem. Each requests causes a few lines in the script to be=
=20
executed. There is no process creation and dispatch for each operation,=
=20
only a process wakeup for each operation. It is impressively lightweigh=
t=20
and it's worth trying before dismissing it as a resource drain.

But anyway, here's another idea for you-- Export a new directory that=20
contains links to only those the files you want to export.


Rob Gardner
HP



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