2013-09-11 20:22:11

by J. Bruce Fields

[permalink] [raw]
Subject: [PATCH] access: fix outdated NFS information

From: "J. Bruce Fields" <[email protected]>

Note that NFS versions since version 3 support an "access" call so that
the client doesn't have to guess permissions or id mapping on its own.

(See rfc 1813 sections 1.7 and 3.3.4.)

Signed-off-by: J. Bruce Fields <[email protected]>
---
man2/access.2 | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/man2/access.2 b/man2/access.2
index 6df68de..3bacab1 100644
--- a/man2/access.2
+++ b/man2/access.2
@@ -209,9 +209,10 @@ Similarly, a DOS file may be found to be "executable," but the
call will still fail.
.PP
.BR access ()
-may not work correctly on NFS filesystems with UID mapping enabled,
+may not work correctly on NFSv2 filesystems with UID mapping enabled,
because UID mapping is done on the server and hidden from the client,
-which checks permissions.
+which checks permissions. (NFS versions 3 and higher perform the check on
+the server.)
Similar problems can occur to FUSE mounts.
.SH BUGS
In kernel 2.4 (and earlier) there is some strangeness in the handling of
--
1.7.9.5



Subject: Re: [PATCH] access: fix outdated NFS information

On 11.09.2013 22:22, J. Bruce Fields wrote:
> From: "J. Bruce Fields" <[email protected]>
>
> Note that NFS versions since version 3 support an "access" call so that
> the client doesn't have to guess permissions or id mapping on its own.
>
> (See rfc 1813 sections 1.7 and 3.3.4.)

Thanks, Bruce. Applied.

Cheers,

Michael


> Signed-off-by: J. Bruce Fields <[email protected]>
> ---
> man2/access.2 | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/man2/access.2 b/man2/access.2
> index 6df68de..3bacab1 100644
> --- a/man2/access.2
> +++ b/man2/access.2
> @@ -209,9 +209,10 @@ Similarly, a DOS file may be found to be "executable," but the
> call will still fail.
> .PP
> .BR access ()
> -may not work correctly on NFS filesystems with UID mapping enabled,
> +may not work correctly on NFSv2 filesystems with UID mapping enabled,
> because UID mapping is done on the server and hidden from the client,
> -which checks permissions.
> +which checks permissions. (NFS versions 3 and higher perform the check on
> +the server.)
> Similar problems can occur to FUSE mounts.
> .SH BUGS
> In kernel 2.4 (and earlier) there is some strangeness in the handling of
>