NFS honouring chattr +a

DISCUSSION Paul Stepowski 2 participants 2 messages May 3, 2005

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Paul Stepowski

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2005-05-03 05:29 UTC #0 lore raw

Hi,

I've already searched the archives on this topic and didn't see anything useful.
I set up a test NFS server (v3) on a linux box and exported a partition
rw,no_squash_root. I set the attributes of a file in the exported partition as follows:

# chattr +a <file>

So the file is append only. When I attempt to read/write/append to the file I get a permission denied errror. Is there any way of getting NFS to honour this attribute as append only?

NOTE: I saw an archived post from Chris Mason suggesting a patch that looks like it will do what I'm asking, but there was no response to his message.

Thanks,

Paul

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Trond Myklebust

2005-05-03 14:32 UTC #1 lore raw

ty den 03.05.2005 Klokka 15:29 (+1000) skreiv Paul Stepowski:

Quoted 7 lines

Hi,
I've already searched the archives on this topic and didn't see anything useful.
I set up a test NFS server (v3) on a linux box and exported a partition
rw,no_squash_root. I set the attributes of a file in the exported partition as follows:

Quoted 5 lines

# chattr +a <file>
So the file is append only. When I attempt to read/write/append to the file I get a permission denied errror. Is there any way of getting NFS to honour this attribute as append only?

There is a patch in recent kernels that prevents NFS from returning an I/O error in the case of a READ, but there is no protocol support at all for APPEND-only files, so there is nothing we can do for writes.

You'll have to find a different solution to your problem.

Cheers,
Trond