pNFS/files: Ensure pNFS allocation modes are consistent with nfsiod

Ensure that pNFS file commit allocations in rpciod/nfsiod callbacks can
fail in low memory mode, so that the threads don't block and loop
forever.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

Author: Trond Myklebust

fs/nfs/filelayout/filelayout.c

@@ -1075,7 +1075,7 @@ filelayout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
 	unsigned int size = (fl->stripe_type == STRIPE_SPARSE) ?
 		fl->dsaddr->ds_num : fl->dsaddr->stripe_count;
 
-	new = pnfs_alloc_commit_array(size, GFP_NOIO);
+	new = pnfs_alloc_commit_array(size, nfs_io_gfp_mask());
 	if (new) {
 		spin_lock(&inode->i_lock);
 		array = pnfs_add_commit_array(fl_cinfo, new, lseg);