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, 105 insertions, 0 deletions

diff --git a/fs/efs/dir.c b/fs/efs/dir.c
new file mode 100644
index 000000000..35ad0092c
--- /dev/null
+++ b/fs/efs/dir.c
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * dir.c
+ *
+ * Copyright (c) 1999 Al Smith
+ */
+
+#include <linux/buffer_head.h>
+#include <linux/filelock.h>
+#include "efs.h"
+
+static int efs_readdir(struct file *, struct dir_context *);
+
+const struct file_operations efs_dir_operations = {
+	.llseek		= generic_file_llseek,
+	.read		= generic_read_dir,
+	.iterate_shared	= efs_readdir,
+	.setlease	= generic_setlease,
+};
+
+const struct inode_operations efs_dir_inode_operations = {
+	.lookup		= efs_lookup,
+};
+
+static int efs_readdir(struct file *file, struct dir_context *ctx)
+{
+	struct inode *inode = file_inode(file);
+	efs_block_t		block;
+	int			slot;
+
+	if (inode->i_size & (EFS_DIRBSIZE-1))
+		pr_warn("%s(): directory size not a multiple of EFS_DIRBSIZE\n",
+			__func__);
+
+	/* work out where this entry can be found */
+	block = ctx->pos >> EFS_DIRBSIZE_BITS;
+
+	/* each block contains at most 256 slots */
+	slot  = ctx->pos & 0xff;
+
+	/* look at all blocks */
+	while (block < inode->i_blocks) {
+		struct efs_dir		*dirblock;
+		struct buffer_head *bh;
+
+		/* read the dir block */
+		bh = sb_bread(inode->i_sb, efs_bmap(inode, block));
+
+		if (!bh) {
+			pr_err("%s(): failed to read dir block %d\n",
+			       __func__, block);
+			break;
+		}
+
+		dirblock = (struct efs_dir *) bh->b_data; 
+
+		if (be16_to_cpu(dirblock->magic) != EFS_DIRBLK_MAGIC) {
+			pr_err("%s(): invalid directory block\n", __func__);
+			brelse(bh);
+			break;
+		}
+
+		for (; slot < dirblock->slots; slot++) {
+			struct efs_dentry *dirslot;
+			efs_ino_t inodenum;
+			const char *nameptr;
+			int namelen;
+
+			if (dirblock->space[slot] == 0)
+				continue;
+
+			dirslot  = (struct efs_dentry *) (((char *) bh->b_data) + EFS_SLOTAT(dirblock, slot));
+
+			inodenum = be32_to_cpu(dirslot->inode);
+			namelen  = dirslot->namelen;
+			nameptr  = dirslot->name;
+			pr_debug("%s(): block %d slot %d/%d: inode %u, name \"%s\", namelen %u\n",
+				 __func__, block, slot, dirblock->slots-1,
+				 inodenum, nameptr, namelen);
+			if (!namelen)
+				continue;
+			/* found the next entry */
+			ctx->pos = (block << EFS_DIRBSIZE_BITS) | slot;
+
+			/* sanity check */
+			if (nameptr - (char *) dirblock + namelen > EFS_DIRBSIZE) {
+				pr_warn("directory entry %d exceeds directory block\n",
+					slot);
+				continue;
+			}
+
+			/* copy filename and data in dirslot */
+			if (!dir_emit(ctx, nameptr, namelen, inodenum, DT_UNKNOWN)) {
+				brelse(bh);
+				return 0;
+			}
+		}
+		brelse(bh);
+
+		slot = 0;
+		block++;
+	}
+	ctx->pos = (block << EFS_DIRBSIZE_BITS) | slot;
+	return 0;
+}