/*
 * 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;
}
on><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>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-01 12:27:05 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-01 12:27:05 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/ipv6/exthdrs_offload.c?id=4759d386d55fef452d692bf101167914437e848e'>4759d386d55fef452d692bf101167914437e848e</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/ipv6/exthdrs_offload.c?id=4759d386d55fef452d692bf101167914437e848e'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=4759d386d55fef452d692bf101167914437e848e'>e7109c192ec589fcea2a98f9702aa3c0e4009581</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/ipv6/exthdrs_offload.c?id=4759d386d55fef452d692bf101167914437e848e'>net/ipv6/exthdrs_offload.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/ipv6/exthdrs_offload.c?id=238d1d0f79f619d75c2cc741d6770fb0986aef24'>238d1d0f79f619d75c2cc741d6770fb0986aef24</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/ipv6/exthdrs_offload.c?id=4759d386d55fef452d692bf101167914437e848e&amp;id2=238d1d0f79f619d75c2cc741d6770fb0986aef24'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/ipv6/exthdrs_offload.c?id=1db175428ee374489448361213e9c3b749d14900'>1db175428ee374489448361213e9c3b749d14900</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/ipv6/exthdrs_offload.c?id=4759d386d55fef452d692bf101167914437e848e&amp;id2=1db175428ee374489448361213e9c3b749d14900'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm</div><div class='commit-msg'>Pull DAX updates from Dan Williams:
 "The completion of Jan's DAX work for 4.10.

  As I mentioned in the libnvdimm-for-4.10 pull request, these are some
  final fixes for the DAX dirty-cacheline-tracking invalidation work
  that was merged through the -mm, ext4, and xfs trees in -rc1. These
  patches were prepared prior to the merge window, but we waited for
  4.10-rc1 to have a stable merge base after all the prerequisites were
  merged.

  Quoting Jan on the overall changes in these patches:

     "So I'd like all these 6 patches to go for rc2. The first three
      patches fix invalidation of exceptional DAX entries (a bug which
      is there for a long time) - without these patches data loss can
      occur on power failure even though user called fsync(2). The other
      three patches change locking of DAX faults so that -&gt;iomap_begin()
      is called in a more relaxed locking context and we are safe to
      start a transaction there for ext4"

  These have received a build success notification from the kbuild
  robot, and pass the latest libnvdimm unit tests. There have not been
  any -next releases since -rc1, so they have not appeared there"

* 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  ext4: Simplify DAX fault path
  dax: Call -&gt;iomap_begin without entry lock during dax fault
  dax: Finish fault completely when loading holes
  dax: Avoid page invalidation races and unnecessary radix tree traversals
  mm: Invalidate DAX radix tree entries only if appropriate
  ext2: Return BH_New buffers for zeroed blocks
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=4759d386d55fef452d692bf101167914437e848e'>Diffstat</a> (limited to 'net/ipv6/exthdrs_offload.c')</div><table summary='diffstat' class='diffstat'>