On Mon, 2023-09-04 at 20:36 +0000, Ondrej Valousek wrote:
> Hi Jeff,
>
> I can confirm that with rawhide kernel 6.5 the error is gone, i.e.
>
> Listxattr() shows only "system.nfs4_acl" attribute on NFSv4 filesystem,
>
> Problem is, that (on the same kernel) getxattr(name,XATTR_NAME_POSIX_ACL_ACCESS, 0,0)
> Sets errno to ENODATA where "name" is file on NFSv4.
>
> This is different behavior to the previous versions, i.e. on RHEL8 getxattr() sets errno to ENOTSUP in the same scenario - which is what I'd expect more.
>
> Is the change of the getxattr() behavior expected or not?
>
> Thanks,
> Ondrej
>
I'd say not. I've been working through xfstests failures on NFS and
didn't realize that this was a regression, and posted this fstests patch
recently:
https://lore.kernel.org/fstests/20230830-fixes-v4-1-88d7b8572aa3@xxxxxxxxxx/
It would be nice if getxattr were also fixed here.
Cheers,
Jeff
> -----Original Message-----
> From: Jeff Layton <jlayton@xxxxxxxxxx>
> Sent: Dienstag, 16. Mai 2023 14:47
> To: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>; Christian Brauner <brauner@xxxxxxxxxx>
> Cc: trondmy@xxxxxxxxxxxxxxx; eggert@xxxxxxxxxxx; bruno@xxxxxxxxx; Ondrej Valousek <ondrej.valousek.xm@xxxxxxxxxxx>; linux-fsdevel@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Subject: [PATCH] fs: don't call posix_acl_listxattr in generic_listxattr
>
> Commit f2620f166e2a caused the kernel to start emitting POSIX ACL xattrs for NFSv4 inodes, which it doesn't support. The only other user of generic_listxattr is HFS (classic) and it doesn't support POSIX ACLs either.
>
> Fixes: f2620f166e2a xattr: simplify listxattr helpers
> Reported-by: Ondrej Valousek <ondrej.valousek.xm@xxxxxxxxxxx>
> Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
> ---
> fs/xattr.c | 15 +++++++++------
> 1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/fs/xattr.c b/fs/xattr.c
> index fcf67d80d7f9..e7bbb7f57557 100644
> --- a/fs/xattr.c
> +++ b/fs/xattr.c
> @@ -985,9 +985,16 @@ int xattr_list_one(char **buffer, ssize_t *remaining_size, const char *name)
> return 0;
> }
>
> -/*
> +/**
> + * generic_listxattr - run through a dentry's xattr list() operations
> + * @dentry: dentry to list the xattrs
> + * @buffer: result buffer
> + * @buffer_size: size of @buffer
> + *
> * Combine the results of the list() operation from every xattr_handler in the
> - * list.
> + * xattr_handler stack.
> + *
> + * Note that this will not include the entries for POSIX ACLs.
> */
> ssize_t
> generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) @@ -996,10 +1003,6 @@ generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
> ssize_t remaining_size = buffer_size;
> int err = 0;
>
> - err = posix_acl_listxattr(d_inode(dentry), &buffer, &remaining_size);
> - if (err)
> - return err;
> -
> for_each_xattr_handler(handlers, handler) {
> if (!handler->name || (handler->list && !handler->list(dentry)))
> continue;
> --
> 2.40.1
>
--
Jeff Layton <jlayton@xxxxxxxxxx>
