/*
 *  xenfs.c - a filesystem for passing info between the a domain and
 *  the hypervisor.
 *
 * 2008-10-07  Alex Zeffertt    Replaced /proc/xen/xenbus with xenfs filesystem
 *                              and /proc/xen compatibility mount point.
 *                              Turned xenfs into a loadable module.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/magic.h>

#include <xen/xen.h>

#include "xenfs.h"
#include "../privcmd.h"
#include "../xenbus/xenbus_comms.h"

#include <asm/xen/hypervisor.h>

MODULE_DESCRIPTION("Xen filesystem");
MODULE_LICENSE("GPL");

static ssize_t capabilities_read(struct file *file, char __user *buf,
				 size_t size, loff_t *off)
{
	char *tmp = "";

	if (xen_initial_domain())
		tmp = "control_d\n";

	return simple_read_from_buffer(buf, size, off, tmp, strlen(tmp));
}

static const struct file_operations capabilities_file_ops = {
	.read = capabilities_read,
	.llseek = default_llseek,
};

static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
{
	static struct tree_descr xenfs_files[] = {
		[2] = { "xenbus", &xen_xenbus_fops, S_IRUSR|S_IWUSR },
		{ "capabilities", &capabilities_file_ops, S_IRUGO },
		{ "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR },
		{""},
	};

	static struct tree_descr xenfs_init_files[] = {
		[2] = { "xenbus", &xen_xenbus_fops, S_IRUSR|S_IWUSR },
		{ "capabilities", &capabilities_file_ops, S_IRUGO },
		{ "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR },
		{ "xsd_kva", &xsd_kva_file_ops, S_IRUSR|S_IWUSR},
		{ "xsd_port", &xsd_port_file_ops, S_IRUSR|S_IWUSR},
#ifdef CONFIG_XEN_SYMS
		{ "xensyms", &xensyms_ops, S_IRUSR},
#endif
		{""},
	};

	return simple_fill_super(sb, XENFS_SUPER_MAGIC,
			xen_initial_domain() ? xenfs_init_files : xenfs_files);
}

static struct dentry *xenfs_mount(struct file_system_type *fs_type,
				  int flags, const char *dev_name,
				  void *data)
{
	return mount_single(fs_type, flags, data, xenfs_fill_super);
}

static struct file_system_type xenfs_type = {
	.owner =	THIS_MODULE,
	.name =		"xenfs",
	.mount =	xenfs_mount,
	.kill_sb =	kill_litter_super,
};
MODULE_ALIAS_FS("xenfs");

static int __init xenfs_init(void)
{
	if (xen_domain())
		return register_filesystem(&xenfs_type);

	pr_info("not registering filesystem on non-xen platform\n");
	return 0;
}

static void __exit xenfs_exit(void)
{
	if (xen_domain())
		unregister_filesystem(&xenfs_type);
}

module_init(xenfs_init);
module_exit(xenfs_exit);

i/linux/net-next.git/commit/fs/xfs/libxfs'>libxfs</a>/<a href='/cgit.cgi/linux/net-next.git/commit/fs/xfs/libxfs/xfs_alloc_btree.c'>xfs_alloc_btree.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><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'>2016-12-12 21:58:13 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-12 21:58:13 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/fs/xfs/libxfs/xfs_alloc_btree.c?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba</a> (<a href='/cgit.cgi/linux/net-next.git/patch/fs/xfs/libxfs/xfs_alloc_btree.c?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/'>f63906f41699c8e38af9d12b063e2ceab0286ef2</a> /<a href='/cgit.cgi/linux/net-next.git/tree/fs/xfs/libxfs/xfs_alloc_btree.c'>fs/xfs/libxfs/xfs_alloc_btree.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/fs/xfs/libxfs/xfs_alloc_btree.c?id=e34bac726d27056081d0250c0e173e4b155aa340'>e34bac726d27056081d0250c0e173e4b155aa340</a> (<a href='/cgit.cgi/linux/net-next.git/diff/fs/xfs/libxfs/xfs_alloc_btree.c?id2=e34bac726d27056081d0250c0e173e4b155aa340'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/fs/xfs/libxfs/xfs_alloc_btree.c?id=868c97a846a73e937d835b09b8c885a69df50ec8'>868c97a846a73e937d835b09b8c885a69df50ec8</a> (<a href='/cgit.cgi/linux/net-next.git/diff/fs/xfs/libxfs/xfs_alloc_btree.c?id2=868c97a846a73e937d835b09b8c885a69df50ec8'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'docs-4.10' of git://git.lwn.net/linux<span class='decoration'><a class='deco' href='/cgit.cgi/linux/net-next.git/commit/fs/xfs/libxfs/xfs_alloc_btree.c?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>HEAD</a><a class='branch-deco' href='/cgit.cgi/linux/net-next.git/log/fs/xfs/libxfs/xfs_alloc_btree.c'>master</a></span></div><div class='commit-msg'>Pull documentation update from Jonathan Corbet:
 "These are the documentation changes for 4.10.

  It's another busy cycle for the docs tree, as the sphinx conversion
  continues. Highlights include:

   - Further work on PDF output, which remains a bit of a pain but
     should be more solid now.

   - Five more DocBook template files converted to Sphinx. Only 27 to
     go... Lots of plain-text files have also been converted and
     integrated.

   - Images in binary formats have been replaced with more
     source-friendly versions.

   - Various bits of organizational work, including the renaming of
     various files discussed at the kernel summit.

   - New documentation for the device_link mechanism.

  ... and, of course, lots of typo fixes and small updates"

* tag 'docs-4.10' of git://git.lwn.net/linux: (193 commits)
  dma-buf: Extract dma-buf.rst
  Update Documentation/00-INDEX
  docs: 00-INDEX: document directories/files with no docs
  docs: 00-INDEX: remove non-existing entries
  docs: 00-INDEX: add missing entries for documentation files/dirs
  docs: 00-INDEX: consolidate process/ and admin-guide/ description
  scripts: add a script to check if Documentation/00-INDEX is sane
  Docs: change sh -&gt; awk in REPORTING-BUGS
  Documentation/core-api/device_link: Add initial documentation
  core-api: remove an unexpected unident
  ppc/idle: Add documentation for powersave=off
  Doc: Correct typo, "Introdution" =&gt; "Introduction"
  Documentation/atomic_ops.txt: convert to ReST markup
  Documentation/local_ops.txt: convert to ReST markup
  Documentation/assoc_array.txt: convert to ReST markup
  docs-rst: parse-headers.pl: cleanup the documentation
  docs-rst: fix media cleandocs target
  docs-rst: media/Makefile: reorganize the rules
  docs-rst: media: build SVG from graphviz files
  docs-rst: replace bayer.png by a SVG image
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/'>Diffstat</a> (limited to 'fs/xfs/libxfs/xfs_alloc_btree.c')</div><table summary='diffstat' class='diffstat'>