* Linux NFSv4.1 client with Linux NFSv4.1 server, getting block size of exported filesystem?
@ 2024-04-03 17:59 Cedric Blancher
2024-04-04 15:38 ` Mkrtchyan, Tigran
0 siblings, 1 reply; 2+ messages in thread
From: Cedric Blancher @ 2024-04-03 17:59 UTC (permalink / raw)
To: Linux NFS Mailing List
Good evening!
Assuming a Linux 6.6 NFSv4.1 client and a Linux 6.6 NFSv4.1 server,
can the NFSv4.1 client obtain the exact block size of the exported
filesystem (e.g. ReiserFS, btrfs, ext4, ...) via fstatat()/stat()?
Ced
--
Cedric Blancher <cedric.blancher@gmail.com>
[https://plus.google.com/u/0/+CedricBlancher/]
Institute Pasteur
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Linux NFSv4.1 client with Linux NFSv4.1 server, getting block size of exported filesystem?
2024-04-03 17:59 Linux NFSv4.1 client with Linux NFSv4.1 server, getting block size of exported filesystem? Cedric Blancher
@ 2024-04-04 15:38 ` Mkrtchyan, Tigran
0 siblings, 0 replies; 2+ messages in thread
From: Mkrtchyan, Tigran @ 2024-04-04 15:38 UTC (permalink / raw)
To: Cedric Blancher; +Cc: Linux NFS Mailing List
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Hi Ced,
no, it can not. However, spec defines two attributes, maxread and maxwrite, that can indicate
client preferred IO request sizes:
https://datatracker.ietf.org/doc/html/rfc5661#section-5.8.2.20
In pNFS case, an additional layout-specific option, that can override those values.
Best regards,
Tigran.
----- Original Message -----
> From: "Cedric Blancher" <cedric.blancher@gmail.com>
> To: "Linux NFS Mailing List" <linux-nfs@vger.kernel.org>
> Sent: Wednesday, 3 April, 2024 19:59:16
> Subject: Linux NFSv4.1 client with Linux NFSv4.1 server, getting block size of exported filesystem?
> Good evening!
>
> Assuming a Linux 6.6 NFSv4.1 client and a Linux 6.6 NFSv4.1 server,
> can the NFSv4.1 client obtain the exact block size of the exported
> filesystem (e.g. ReiserFS, btrfs, ext4, ...) via fstatat()/stat()?
>
> Ced
> --
> Cedric Blancher <cedric.blancher@gmail.com>
> [https://plus.google.com/u/0/+CedricBlancher/]
> Institute Pasteur
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2024-04-03 17:59 Linux NFSv4.1 client with Linux NFSv4.1 server, getting block size of exported filesystem? Cedric Blancher
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