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, 251 insertions, 0 deletions

diff --git a/fs/bad_inode.c b/fs/bad_inode.c
new file mode 100644
index 000000000..acf8613f5
--- /dev/null
+++ b/fs/bad_inode.c
@@ -0,0 +1,251 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  linux/fs/bad_inode.c
+ *
+ *  Copyright (C) 1997, Stephen Tweedie
+ *
+ *  Provide stub functions for unreadable inodes
+ *
+ *  Fabian Frederick : August 2003 - All file operations assigned to EIO
+ */
+
+#include <linux/fs.h>
+#include <linux/export.h>
+#include <linux/stat.h>
+#include <linux/time.h>
+#include <linux/namei.h>
+#include <linux/poll.h>
+#include <linux/fiemap.h>
+
+static int bad_file_open(struct inode *inode, struct file *filp)
+{
+	return -EIO;
+}
+
+static const struct file_operations bad_file_ops =
+{
+	.open		= bad_file_open,
+};
+
+static int bad_inode_create(struct mnt_idmap *idmap,
+			    struct inode *dir, struct dentry *dentry,
+			    umode_t mode, bool excl)
+{
+	return -EIO;
+}
+
+static struct dentry *bad_inode_lookup(struct inode *dir,
+			struct dentry *dentry, unsigned int flags)
+{
+	return ERR_PTR(-EIO);
+}
+
+static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
+		struct dentry *dentry)
+{
+	return -EIO;
+}
+
+static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
+{
+	return -EIO;
+}
+
+static int bad_inode_symlink(struct mnt_idmap *idmap,
+			     struct inode *dir, struct dentry *dentry,
+			     const char *symname)
+{
+	return -EIO;
+}
+
+static struct dentry *bad_inode_mkdir(struct mnt_idmap *idmap, struct inode *dir,
+				      struct dentry *dentry, umode_t mode)
+{
+	return ERR_PTR(-EIO);
+}
+
+static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
+{
+	return -EIO;
+}
+
+static int bad_inode_mknod(struct mnt_idmap *idmap, struct inode *dir,
+			   struct dentry *dentry, umode_t mode, dev_t rdev)
+{
+	return -EIO;
+}
+
+static int bad_inode_rename2(struct mnt_idmap *idmap,
+			     struct inode *old_dir, struct dentry *old_dentry,
+			     struct inode *new_dir, struct dentry *new_dentry,
+			     unsigned int flags)
+{
+	return -EIO;
+}
+
+static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
+		int buflen)
+{
+	return -EIO;
+}
+
+static int bad_inode_permission(struct mnt_idmap *idmap,
+				struct inode *inode, int mask)
+{
+	return -EIO;
+}
+
+static int bad_inode_getattr(struct mnt_idmap *idmap,
+			     const struct path *path, struct kstat *stat,
+			     u32 request_mask, unsigned int query_flags)
+{
+	return -EIO;
+}
+
+static int bad_inode_setattr(struct mnt_idmap *idmap,
+			     struct dentry *direntry, struct iattr *attrs)
+{
+	return -EIO;
+}
+
+static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
+			size_t buffer_size)
+{
+	return -EIO;
+}
+
+static const char *bad_inode_get_link(struct dentry *dentry,
+				      struct inode *inode,
+				      struct delayed_call *done)
+{
+	return ERR_PTR(-EIO);
+}
+
+static struct posix_acl *bad_inode_get_acl(struct inode *inode, int type, bool rcu)
+{
+	return ERR_PTR(-EIO);
+}
+
+static int bad_inode_fiemap(struct inode *inode,
+			    struct fiemap_extent_info *fieinfo, u64 start,
+			    u64 len)
+{
+	return -EIO;
+}
+
+static int bad_inode_update_time(struct inode *inode, enum fs_update_time type,
+				 unsigned int flags)
+{
+	return -EIO;
+}
+
+static int bad_inode_atomic_open(struct inode *inode, struct dentry *dentry,
+				 struct file *file, unsigned int open_flag,
+				 umode_t create_mode)
+{
+	return -EIO;
+}
+
+static int bad_inode_tmpfile(struct mnt_idmap *idmap,
+			     struct inode *inode, struct file *file,
+			     umode_t mode)
+{
+	return -EIO;
+}
+
+static int bad_inode_set_acl(struct mnt_idmap *idmap,
+			     struct dentry *dentry, struct posix_acl *acl,
+			     int type)
+{
+	return -EIO;
+}
+
+static const struct inode_operations bad_inode_ops =
+{
+	.create		= bad_inode_create,
+	.lookup		= bad_inode_lookup,
+	.link		= bad_inode_link,
+	.unlink		= bad_inode_unlink,
+	.symlink	= bad_inode_symlink,
+	.mkdir		= bad_inode_mkdir,
+	.rmdir		= bad_inode_rmdir,
+	.mknod		= bad_inode_mknod,
+	.rename		= bad_inode_rename2,
+	.readlink	= bad_inode_readlink,
+	.permission	= bad_inode_permission,
+	.getattr	= bad_inode_getattr,
+	.setattr	= bad_inode_setattr,
+	.listxattr	= bad_inode_listxattr,
+	.get_link	= bad_inode_get_link,
+	.get_inode_acl	= bad_inode_get_acl,
+	.fiemap		= bad_inode_fiemap,
+	.update_time	= bad_inode_update_time,
+	.atomic_open	= bad_inode_atomic_open,
+	.tmpfile	= bad_inode_tmpfile,
+	.set_acl	= bad_inode_set_acl,
+};
+
+
+/*
+ * When a filesystem is unable to read an inode due to an I/O error in
+ * its read_inode() function, it can call make_bad_inode() to return a
+ * set of stubs which will return EIO errors as required. 
+ *
+ * We only need to do limited initialisation: all other fields are
+ * preinitialised to zero automatically.
+ */
+ 
+/**
+ *	make_bad_inode - mark an inode bad due to an I/O error
+ *	@inode: Inode to mark bad
+ *
+ *	When an inode cannot be read due to a media or remote network
+ *	failure this function makes the inode "bad" and causes I/O operations
+ *	on it to fail from this point on.
+ */
+ 
+void make_bad_inode(struct inode *inode)
+{
+	remove_inode_hash(inode);
+
+	inode->i_mode = S_IFREG;
+	simple_inode_init_ts(inode);
+	inode->i_op = &bad_inode_ops;	
+	inode->i_opflags &= ~IOP_XATTR;
+	inode->i_fop = &bad_file_ops;	
+}
+EXPORT_SYMBOL(make_bad_inode);
+
+/*
+ * This tests whether an inode has been flagged as bad. The test uses
+ * &bad_inode_ops to cover the case of invalidated inodes as well as
+ * those created by make_bad_inode() above.
+ */
+ 
+/**
+ *	is_bad_inode - is an inode errored
+ *	@inode: inode to test
+ *
+ *	Returns true if the inode in question has been marked as bad.
+ */
+ 
+bool is_bad_inode(struct inode *inode)
+{
+	return (inode->i_op == &bad_inode_ops);	
+}
+
+EXPORT_SYMBOL(is_bad_inode);
+
+/**
+ * iget_failed - Mark an under-construction inode as dead and release it
+ * @inode: The inode to discard
+ *
+ * Mark an under-construction inode as dead and release it.
+ */
+void iget_failed(struct inode *inode)
+{
+	make_bad_inode(inode);
+	unlock_new_inode(inode);
+	iput(inode);
+}
+EXPORT_SYMBOL(iget_failed);