/*
 * fs/sysfs/symlink.c - operations for initializing and mounting sysfs
 *
 * Copyright (c) 2001-3 Patrick Mochel
 * Copyright (c) 2007 SUSE Linux Products GmbH
 * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
 *
 * This file is released under the GPLv2.
 *
 * Please see Documentation/filesystems/sysfs.txt for more information.
 */

#define DEBUG

#include <linux/fs.h>
#include <linux/magic.h>
#include <linux/mount.h>
#include <linux/init.h>
#include <linux/user_namespace.h>

#include "sysfs.h"

static struct kernfs_root *sysfs_root;
struct kernfs_node *sysfs_root_kn;

static struct dentry *sysfs_mount(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data)
{
	struct dentry *root;
	void *ns;
	bool new_sb;

	if (!(flags & MS_KERNMOUNT)) {
		if (!kobj_ns_current_may_mount(KOBJ_NS_TYPE_NET))
			return ERR_PTR(-EPERM);
	}

	ns = kobj_ns_grab_current(KOBJ_NS_TYPE_NET);
	root = kernfs_mount_ns(fs_type, flags, sysfs_root,
				SYSFS_MAGIC, &new_sb, ns);
	if (IS_ERR(root) || !new_sb)
		kobj_ns_drop(KOBJ_NS_TYPE_NET, ns);
	else if (new_sb)
		root->d_sb->s_iflags |= SB_I_USERNS_VISIBLE;

	return root;
}

static void sysfs_kill_sb(struct super_block *sb)
{
	void *ns = (void *)kernfs_super_ns(sb);

	kernfs_kill_sb(sb);
	kobj_ns_drop(KOBJ_NS_TYPE_NET, ns);
}

static struct file_system_type sysfs_fs_type = {
	.name		= "sysfs",
	.mount		= sysfs_mount,
	.kill_sb	= sysfs_kill_sb,
	.fs_flags	= FS_USERNS_MOUNT,
};

int __init sysfs_init(void)
{
	int err;

	sysfs_root = kernfs_create_root(NULL, KERNFS_ROOT_EXTRA_OPEN_PERM_CHECK,
					NULL);
	if (IS_ERR(sysfs_root))
		return PTR_ERR(sysfs_root);

	sysfs_root_kn = sysfs_root->kn;

	err = register_filesystem(&sysfs_fs_type);
	if (err) {
		kernfs_destroy_root(sysfs_root);
		return err;
	}

	return 0;
}
 href='/cgit.cgi/linux/net-next.git/log/drivers/usb/host?h=nds-private-remove'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/host?h=nds-private-remove&amp;id=fc6f41ba8b2e705f91324db158c3cc28209a15b1'>tree</a><a class='active' href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host?h=nds-private-remove&amp;id=fc6f41ba8b2e705f91324db158c3cc28209a15b1'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/host?h=nds-private-remove&amp;id=fc6f41ba8b2e705f91324db158c3cc28209a15b1'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/drivers/usb/host'>
<input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='fc6f41ba8b2e705f91324db158c3cc28209a15b1'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=fc6f41ba8b2e705f91324db158c3cc28209a15b1'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?h=nds-private-remove&amp;id=fc6f41ba8b2e705f91324db158c3cc28209a15b1'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?h=nds-private-remove&amp;id=fc6f41ba8b2e705f91324db158c3cc28209a15b1'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host?h=nds-private-remove&amp;id=fc6f41ba8b2e705f91324db158c3cc28209a15b1'>host</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='fc6f41ba8b2e705f91324db158c3cc28209a15b1'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><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>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-02-10 14:35:22 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-02-10 14:35:22 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host?h=nds-private-remove&amp;id=fc6f41ba8b2e705f91324db158c3cc28209a15b1'>fc6f41ba8b2e705f91324db158c3cc28209a15b1</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/host?id=fc6f41ba8b2e705f91324db158c3cc28209a15b1'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=fc6f41ba8b2e705f91324db158c3cc28209a15b1'>567bede1cc6bd9f2dec3a3dc85e908e02557da2e</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/host?h=nds-private-remove&amp;id=fc6f41ba8b2e705f91324db158c3cc28209a15b1'>drivers/usb/host</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host?h=nds-private-remove&amp;id=1f369d1655c1de415a186c6ce9004e40ca790989'>1f369d1655c1de415a186c6ce9004e40ca790989</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/host?h=nds-private-remove&amp;id=fc6f41ba8b2e705f91324db158c3cc28209a15b1&amp;id2=1f369d1655c1de415a186c6ce9004e40ca790989'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host?h=nds-private-remove&amp;id=5cad24d835772f9f709971a8d6fcf12afe53b2a7'>5cad24d835772f9f709971a8d6fcf12afe53b2a7</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/host?h=nds-private-remove&amp;id=fc6f41ba8b2e705f91324db158c3cc28209a15b1&amp;id2=5cad24d835772f9f709971a8d6fcf12afe53b2a7'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'mmc-v4.10-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc</div><div class='commit-msg'>Pull MMC host fix from Ulf Hansson:
 "mmci: Fix hang while waiting for busy-end interrupt"

* tag 'mmc-v4.10-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc:
  mmc: mmci: avoid clearing ST Micro busy end interrupt mistakenly
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=fc6f41ba8b2e705f91324db158c3cc28209a15b1'>Diffstat</a> (limited to 'drivers/usb/host')</div><table summary='diffstat' class='diffstat'>