* Jiri Slaby [2016-03-16 11:58:46 +0100]:
> From: NeilBrown <neilb@xxxxxxxx>
>
> 3.12-stable review patch. If anyone has any objections, please let me know.
> If a non-inherited ACL is set on a directory, nfsd will try to set the Posix
> default ACL to NULL. This gets converted to "" by generic_setxattr().
> As "" is not a valid posix acl attribute value, this results in an error.
>
> So instead of setting the xattr to NULL, remove it.
There is similar code in nfsd_set_posix_acl() further down in the same source
file which skips the vfs_removexattr() call for default ACLs on non-directories
(there shouldn't be too many of these) and ignores ENODATA returns from
vfs_removexattr(). Are these precautions guaranteed to be unnecessary here in
set_nfsv4_acl_one() ?
> Fixes: ba1816b40a ("nfsd: fix NFS regression")
> Signed-off-by: NeilBrown <neilb@xxxxxxxx>
> Cc: Sergio Gelato <Sergio.Gelato@xxxxxxxxxxx>
> Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
> ---
> fs/nfsd/vfs.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
> index fafac65804d6..e5f146c7c871 100644
> --- a/fs/nfsd/vfs.c
> +++ b/fs/nfsd/vfs.c
> @@ -510,7 +510,7 @@ set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key)
> int error = 0;
>
> if (!pacl)
> - return vfs_setxattr(dentry, key, NULL, 0, 0);
> + return vfs_removexattr(dentry, key);
>
> buflen = posix_acl_xattr_size(pacl->a_count);
> buf = kmalloc(buflen, GFP_KERNEL);
> --
> 2.7.3
>
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