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NFSD: Fix nfs4_verifier memory alignment

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Clean up due to code review.

The nfs4_verifier's data field is not guaranteed to be u32-aligned.
Casting an array of chars to a u32 * is considered generally
hazardous.

We can fix most of this by using a __be32 array to generate the
verifier's contents and then byte-copying it into the verifier field.

However, there is one spot where there is a backwards compatibility
constraint: the do_nfsd_create() call expects a verifier which is
32-bit aligned.  Fix this spot by forcing the alignment of the create
verifier in the nfsd4_open args structure.

Also, sizeof(nfs4_verifer) is the size of the in-core verifier data
structure, but NFS4_VERIFIER_SIZE is the number of octets in an XDR'd
verifier.  The two are not interchangeable, even if they happen to
have the same value.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Chuck Lever
2012-03-02 17:13:50 -05:00
committed by J. Bruce Fields
parent 8f199b8262
commit ab4684d156
4 changed files with 31 additions and 28 deletions
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8
fs/nfsd/nfs4state.c
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@@ -1174,12 +1174,12 @@ static void gen_clid(struct nfs4_client *clp)
static void gen_confirm(struct nfs4_client *clp)
{
__be32 verf[2];
static u32 i;
u32 *p;
p = (u32 *)clp->cl_confirm.data;
*p++ = get_seconds();
*p++ = i++;
verf[0] = (__be32)get_seconds();
verf[1] = (__be32)i++;
memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
}
static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)