/*
 * Copyright (c) 2011 Bryan Schumaker <bjschuma@netapp.com>
 *
 * Uses debugfs to create fault injection points for client testing
 */

#include <linux/types.h>
#include <linux/fs.h>
#include <linux/debugfs.h>
#include <linux/module.h>
#include <linux/nsproxy.h>
#include <linux/sunrpc/addr.h>
#include <linux/uaccess.h>

#include "state.h"
#include "netns.h"

struct nfsd_fault_inject_op {
	char *file;
	u64 (*get)(void);
	u64 (*set_val)(u64);
	u64 (*set_clnt)(struct sockaddr_storage *, size_t);
};

static struct dentry *debug_dir;

static ssize_t fault_inject_read(struct file *file, char __user *buf,
				 size_t len, loff_t *ppos)
{
	static u64 val;
	char read_buf[25];
	size_t size;
	loff_t pos = *ppos;
	struct nfsd_fault_inject_op *op = file_inode(file)->i_private;

	if (!pos)
		val = op->get();
	size = scnprintf(read_buf, sizeof(read_buf), "%llu\n", val);

	return simple_read_from_buffer(buf, len, ppos, read_buf, size);
}

static ssize_t fault_inject_write(struct file *file, const char __user *buf,
				  size_t len, loff_t *ppos)
{
	char write_buf[INET6_ADDRSTRLEN];
	size_t size = min(sizeof(write_buf) - 1, len);
	struct net *net = current->nsproxy->net_ns;
	struct sockaddr_storage sa;
	struct nfsd_fault_inject_op *op = file_inode(file)->i_private;
	u64 val;
	char *nl;

	if (copy_from_user(write_buf, buf, size))
		return -EFAULT;
	write_buf[size] = '\0';

	/* Deal with any embedded newlines in the string */
	nl = strchr(write_buf, '\n');
	if (nl) {
		size = nl - write_buf;
		*nl = '\0';
	}

	size = rpc_pton(net, write_buf, size, (struct sockaddr *)&sa, sizeof(sa));
	if (size > 0) {
		val = op->set_clnt(&sa, size);
		if (val)
			pr_info("NFSD [%s]: Client %s had %llu state object(s)\n",
				op->file, write_buf, val);
	} else {
		val = simple_strtoll(write_buf, NULL, 0);
		if (val == 0)
			pr_info("NFSD Fault Injection: %s (all)", op->file);
		else
			pr_info("NFSD Fault Injection: %s (n = %llu)",
				op->file, val);
		val = op->set_val(val);
		pr_info("NFSD: %s: found %llu", op->file, val);
	}
	return len; /* on success, claim we got the whole input */
}

static const struct file_operations fops_nfsd = {
	.owner   = THIS_MODULE,
	.read    = fault_inject_read,
	.write   = fault_inject_write,
};

void nfsd_fault_inject_cleanup(void)
{
	debugfs_remove_recursive(debug_dir);
}

static struct nfsd_fault_inject_op inject_ops[] = {
	{
		.file     = "forget_clients",
		.get	  = nfsd_inject_print_clients,
		.set_val  = nfsd_inject_forget_clients,
		.set_clnt = nfsd_inject_forget_client,
	},
	{
		.file     = "forget_locks",
		.get	  = nfsd_inject_print_locks,
		.set_val  = nfsd_inject_forget_locks,
		.set_clnt = nfsd_inject_forget_client_locks,
	},
	{
		.file     = "forget_openowners",
		.get	  = nfsd_inject_print_openowners,
		.set_val  = nfsd_inject_forget_openowners,
		.set_clnt = nfsd_inject_forget_client_openowners,
	},
	{
		.file     = "forget_delegations",
		.get	  = nfsd_inject_print_delegations,
		.set_val  = nfsd_inject_forget_delegations,
		.set_clnt = nfsd_inject_forget_client_delegations,
	},
	{
		.file     = "recall_delegations",
		.get	  = nfsd_inject_print_delegations,
		.set_val  = nfsd_inject_recall_delegations,
		.set_clnt = nfsd_inject_recall_client_delegations,
	},
};

#define NUM_INJECT_OPS (sizeof(inject_ops)/sizeof(struct nfsd_fault_inject_op))

int nfsd_fault_inject_init(void)
{
	unsigned int i;
	struct nfsd_fault_inject_op *op;
	umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;

	debug_dir = debugfs_create_dir("nfsd", NULL);
	if (!debug_dir)
		goto fail;

	for (i = 0; i < NUM_INJECT_OPS; i++) {
		op = &inject_ops[i];
		if (!debugfs_create_file(op->file, mode, debug_dir, op, &fops_nfsd))
			goto fail;
	}
	return 0;

fail:
	nfsd_fault_inject_cleanup();
	return -ENOMEM;
}
><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Arnd Bergmann &lt;arnd@arndb.de&gt;</td><td class='right'>2017-02-07 09:59:21 -0800</td></tr>
<tr><th>committer</th><td>Dmitry Torokhov &lt;dmitry.torokhov@gmail.com&gt;</td><td class='right'>2017-02-07 14:31:45 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/renesas_usbhs/pipe.c?id=413d37326700aaf708730b940b04192c36e13ef4'>413d37326700aaf708730b940b04192c36e13ef4</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/renesas_usbhs/pipe.c?id=413d37326700aaf708730b940b04192c36e13ef4'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=413d37326700aaf708730b940b04192c36e13ef4'>b31f87b933d437d7f1754dfb983f3b33b7296a2e</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/renesas_usbhs/pipe.c?id=413d37326700aaf708730b940b04192c36e13ef4'>drivers/usb/renesas_usbhs/pipe.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/renesas_usbhs/pipe.c?id=601bbbe0517303c9f8eb3d75e11d64efed1293c9'>601bbbe0517303c9f8eb3d75e11d64efed1293c9</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/renesas_usbhs/pipe.c?id=413d37326700aaf708730b940b04192c36e13ef4&amp;id2=601bbbe0517303c9f8eb3d75e11d64efed1293c9'>diff</a>)</td></tr></table>
<div class='commit-subject'>Input: synaptics-rmi4 - select 'SERIO' when needed</div><div class='commit-msg'>With CONFIG_SERIO=m, we get a build error for the rmi4-f03 driver,
added in linux-4.10:

warning: (HID_RMI) selects RMI4_F03 which has unmet direct dependencies (!UML &amp;&amp; INPUT &amp;&amp; RMI4_CORE &amp;&amp; (SERIO=y || RMI4_CORE=SERIO))
drivers/input/built-in.o: In function `rmi_f03_attention':
rmi_f03.c:(.text+0xcfe0): undefined reference to `serio_interrupt'
rmi_f03.c:(.text+0xd055): undefined reference to `serio_interrupt'
drivers/input/built-in.o: In function `rmi_f03_remove':
rmi_f03.c:(.text+0xd115): undefined reference to `serio_unregister_port'
drivers/input/built-in.o: In function `rmi_f03_probe':
rmi_f03.c:(.text+0xd209): undefined reference to `__serio_register_port'

An earlier patch tried to fix this, but missed the HID_RMI driver that
does a 'select' on the F03 backend.

This adds a hidden Kconfig symbol that enforces 'serio' to be enabled
when RMI4-F03 is, which covers all cases.

Fixes: d7ddad0acc4a ("Input: synaptics-rmi4 - fix F03 build error when serio is module")
Fixes: c5e8848fc98e ("Input: synaptics-rmi4 - add support for F03")
Signed-off-by: Arnd Bergmann &lt;arnd@arndb.de&gt;
Signed-off-by: Dmitry Torokhov &lt;dmitry.torokhov@gmail.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=413d37326700aaf708730b940b04192c36e13ef4'>Diffstat</a> (limited to 'drivers/usb/renesas_usbhs/pipe.c')</div><table summary='diffstat' class='diffstat'>