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[13/22] pnfs-submit: wave2: check that partial LAYOUTGET return is ignored

Message ID 1291944177-7819-14-git-send-email-iisaman@netapp.com (mailing list archive)
State RFC, archived
Headers show

Commit Message

Fred Isaman Dec. 10, 2010, 1:22 a.m. UTC
None
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Patch

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 3ee9621..2e35706 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -909,6 +909,17 @@  pnfs_layout_process(struct nfs4_layoutget *lgp)
 	struct nfs_client *clp = NFS_SERVER(ino)->nfs_client;
 	int status = 0;
 
+	/* Verify we got what we asked for.
+	 * Note that because the xdr parsing only accepts a single
+	 * element array, this can fail even if the server is behaving
+	 * correctly.
+	 */
+	if (lgp->args.range.iomode > res->range.iomode ||
+	    res->range.offset != 0 ||
+	    res->range.length != NFS4_MAX_UINT64) {
+		status = -EINVAL;
+		goto out;
+	}
 	/* Inject layout blob into I/O device driver */
 	lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res);
 	if (!lseg || IS_ERR(lseg)) {