scftorture: Count single_rpc offline failures in statistics outputgrafted

scf_torture_stats_print() aggregates each invoker thread's counters
into a local scf_statistics structure before printing, but the
n_single_rpc_ofl field is missing from the aggregation loop.  As a
result, the "single_rpc_ofl" value printed in the statistics line is
always zero, even when smp_call_function_single() invocations for the
RPC test have failed due to offline CPUs and been counted by the
invoker threads.

Add the missing accumulation so that the printed value reflects the
actual counts.

Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

1 files changed, 194 insertions, 0 deletions

diff --git a/fs/gfs2/export.c b/fs/gfs2/export.c
new file mode 100644
index 000000000..3334c394c
--- /dev/null
+++ b/fs/gfs2/export.c
@@ -0,0 +1,194 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
+ */
+
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/exportfs.h>
+#include <linux/gfs2_ondisk.h>
+#include <linux/crc32.h>
+
+#include "gfs2.h"
+#include "incore.h"
+#include "dir.h"
+#include "glock.h"
+#include "glops.h"
+#include "inode.h"
+#include "super.h"
+#include "rgrp.h"
+#include "util.h"
+
+#define GFS2_SMALL_FH_SIZE 4
+#define GFS2_LARGE_FH_SIZE 8
+#define GFS2_OLD_FH_SIZE 10
+
+static int gfs2_encode_fh(struct inode *inode, __u32 *p, int *len,
+			  struct inode *parent)
+{
+	__be32 *fh = (__force __be32 *)p;
+	struct super_block *sb = inode->i_sb;
+	struct gfs2_inode *ip = GFS2_I(inode);
+
+	if (parent && (*len < GFS2_LARGE_FH_SIZE)) {
+		*len = GFS2_LARGE_FH_SIZE;
+		return FILEID_INVALID;
+	} else if (*len < GFS2_SMALL_FH_SIZE) {
+		*len = GFS2_SMALL_FH_SIZE;
+		return FILEID_INVALID;
+	}
+
+	fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32);
+	fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
+	fh[2] = cpu_to_be32(ip->i_no_addr >> 32);
+	fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
+	*len = GFS2_SMALL_FH_SIZE;
+
+	if (!parent || inode == d_inode(sb->s_root))
+		return *len;
+
+	ip = GFS2_I(parent);
+
+	fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32);
+	fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
+	fh[6] = cpu_to_be32(ip->i_no_addr >> 32);
+	fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
+	*len = GFS2_LARGE_FH_SIZE;
+
+	return *len;
+}
+
+struct get_name_filldir {
+	struct dir_context ctx;
+	struct gfs2_inum_host inum;
+	char *name;
+};
+
+static bool get_name_filldir(struct dir_context *ctx, const char *name,
+			    int length, loff_t offset, u64 inum,
+			    unsigned int type)
+{
+	struct get_name_filldir *gnfd =
+		container_of(ctx, struct get_name_filldir, ctx);
+
+	if (inum != gnfd->inum.no_addr)
+		return true;
+
+	memcpy(gnfd->name, name, length);
+	gnfd->name[length] = 0;
+
+	return false;
+}
+
+static int gfs2_get_name(struct dentry *parent, char *name,
+			 struct dentry *child)
+{
+	struct inode *dir = d_inode(parent);
+	struct inode *inode = d_inode(child);
+	struct gfs2_inode *dip, *ip;
+	struct get_name_filldir gnfd = {
+		.ctx.actor = get_name_filldir,
+		.name = name
+	};
+	struct gfs2_holder gh;
+	int error;
+	struct file_ra_state f_ra = { .start = 0 };
+
+	if (!dir)
+		return -EINVAL;
+
+	if (!S_ISDIR(dir->i_mode) || !inode)
+		return -EINVAL;
+
+	dip = GFS2_I(dir);
+	ip = GFS2_I(inode);
+
+	*name = 0;
+	gnfd.inum.no_addr = ip->i_no_addr;
+	gnfd.inum.no_formal_ino = ip->i_no_formal_ino;
+
+	error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
+	if (error)
+		return error;
+
+	error = gfs2_dir_read(dir, &gnfd.ctx, &f_ra);
+
+	gfs2_glock_dq_uninit(&gh);
+
+	if (!error && !*name)
+		error = -ENOENT;
+
+	return error;
+}
+
+static struct dentry *gfs2_get_parent(struct dentry *child)
+{
+	return d_obtain_alias(gfs2_lookupi(d_inode(child), &gfs2_qdotdot, 1));
+}
+
+static struct dentry *gfs2_get_dentry(struct super_block *sb,
+				      struct gfs2_inum_host *inum)
+{
+	struct gfs2_sbd *sdp = sb->s_fs_info;
+	struct inode *inode;
+
+	if (!inum->no_formal_ino)
+		return ERR_PTR(-ESTALE);
+	inode = gfs2_lookup_by_inum(sdp, inum->no_addr, inum->no_formal_ino,
+				    GFS2_BLKST_DINODE);
+	return d_obtain_alias(inode);
+}
+
+static struct dentry *gfs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
+		int fh_len, int fh_type)
+{
+	struct gfs2_inum_host this;
+	__be32 *fh = (__force __be32 *)fid->raw;
+
+	switch (fh_type) {
+	case GFS2_SMALL_FH_SIZE:
+	case GFS2_LARGE_FH_SIZE:
+	case GFS2_OLD_FH_SIZE:
+		if (fh_len < GFS2_SMALL_FH_SIZE)
+			return NULL;
+		this.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32;
+		this.no_formal_ino |= be32_to_cpu(fh[1]);
+		this.no_addr = ((u64)be32_to_cpu(fh[2])) << 32;
+		this.no_addr |= be32_to_cpu(fh[3]);
+		return gfs2_get_dentry(sb, &this);
+	default:
+		return NULL;
+	}
+}
+
+static struct dentry *gfs2_fh_to_parent(struct super_block *sb, struct fid *fid,
+		int fh_len, int fh_type)
+{
+	struct gfs2_inum_host parent;
+	__be32 *fh = (__force __be32 *)fid->raw;
+
+	switch (fh_type) {
+	case GFS2_LARGE_FH_SIZE:
+	case GFS2_OLD_FH_SIZE:
+		if (fh_len < GFS2_LARGE_FH_SIZE)
+			return NULL;
+		parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32;
+		parent.no_formal_ino |= be32_to_cpu(fh[5]);
+		parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;
+		parent.no_addr |= be32_to_cpu(fh[7]);
+		return gfs2_get_dentry(sb, &parent);
+	default:
+		return NULL;
+	}
+}
+
+const struct export_operations gfs2_export_ops = {
+	.encode_fh = gfs2_encode_fh,
+	.fh_to_dentry = gfs2_fh_to_dentry,
+	.fh_to_parent = gfs2_fh_to_parent,
+	.get_name = gfs2_get_name,
+	.get_parent = gfs2_get_parent,
+};
+