NFS fix the setting of exchange id flag
Indicate support for referrals. Do not set any PNFS roles. Check the flags
returned by the server for validity. Do not use exchange flags from an old
client ID instance when recovering a client ID.
Update the EXCHID4_FLAG_XXX set to RFC 5661.
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index f2b92f6..9d992b0 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4519,6 +4519,25 @@
#ifdef CONFIG_NFS_V4_1
/*
+ * Check the exchange flags returned by the server for invalid flags, having
+ * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
+ * DS flags set.
+ */
+static int nfs4_check_cl_exchange_flags(u32 flags)
+{
+ if (flags & ~EXCHGID4_FLAG_MASK_R)
+ goto out_inval;
+ if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
+ (flags & EXCHGID4_FLAG_USE_NON_PNFS))
+ goto out_inval;
+ if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
+ goto out_inval;
+ return NFS_OK;
+out_inval:
+ return -NFS4ERR_INVAL;
+}
+
+/*
* nfs4_proc_exchange_id()
*
* Since the clientid has expired, all compounds using sessions
@@ -4531,7 +4550,7 @@
nfs4_verifier verifier;
struct nfs41_exchange_id_args args = {
.client = clp,
- .flags = clp->cl_exchange_flags,
+ .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
};
struct nfs41_exchange_id_res res = {
.client = clp,
@@ -4548,9 +4567,6 @@
dprintk("--> %s\n", __func__);
BUG_ON(clp == NULL);
- /* Remove server-only flags */
- args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
-
p = (u32 *)verifier.data;
*p++ = htonl((u32)clp->cl_boot_time.tv_sec);
*p = htonl((u32)clp->cl_boot_time.tv_nsec);
@@ -4576,6 +4592,7 @@
break;
}
+ status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
dprintk("<-- %s status= %d\n", __func__, status);
return status;
}
