On Wed, Jul 07, 2010 at 10:31:26AM -0400, David P. Quigley wrote:
> This patch adds the ability to encode and decode file labels on the server for
> static __be32
> nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
> - struct iattr *iattr, struct nfs4_acl **acl)
> + struct iattr *iattr, struct nfs4_acl **acl,
> + struct nfs4_label **label)
As we add more arguments, I wonder if at some point it becomes worth
creating something like
struct nfsd4_attrs {
struct iattr iattr;
struct nfs4_acl *acl;
...
}
and passing that instead?
> +#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
> + if (bmval[1] & FATTR4_WORD1_SECURITY_LABEL) {
> + uint32_t lfs;
> +
> + READ_BUF(4);
> + len += 4;
> + READ32(lfs);
> + READ_BUF(4);
> + len += 4;
> + READ32(dummy32);
> + READ_BUF(dummy32);
> + len += (XDR_QUADLEN(dummy32) << 2);
> + READMEM(buf, dummy32);
> +
> + if (dummy32 > NFS4_MAXLABELLEN)
> + return nfserr_resource;
> +
> + *label = kzalloc(sizeof(struct nfs4_label), GFP_KERNEL);
Could we allocate this some toher way (it's small, right?) and avoid the
extra dynamic allocation here, just for simplicity's sake?
> + if (*label == NULL) {
> + host_err = -ENOMEM;
> + goto out_nfserr;
> + }
> +
> + (*label)->label = kmalloc(dummy32 + 1, GFP_KERNEL);
Might be nice to arrange NFS4_MAXLABELLEN to ensure this is never a
higher-order allocation.
> +#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
> +static inline __be32
> +nfsd4_encode_security_label(struct svc_rqst *rqstp, struct dentry *dentry, __be32 **pp, int *buflen)
> +{
> + void *context;
> + int err;
> + int len;
> + uint32_t lfs = 0;
> + __be32 *p = *pp;
> +
> + err = 0;
> + (void)security_inode_getsecctx(dentry->d_inode, &context, &len);
> + if (len < 0)
> + return nfserrno(len);
> +
> + if (*buflen < ((XDR_QUADLEN(len) << 2) + 4 +4)) {
We could use better helpers for this; it's kind of lame to have to do
this by hand.
> + err = nfserr_resource;
> + goto out;
> + }
> +
> + /* XXX: A call to the translation code should be placed here
> + * for now send 0 until we have that to indicate the null
> + * translation */
I guess I should try to understand what that is some day.
> +
> + if ((*buflen -= 4) < 0)
Redundant?
--b.
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