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authorAlex Zeffertt <alex.zeffertt@eu.citrix.com>2009-01-08 03:07:11 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 17:30:59 +0100
commit1107ba885e46964316c083d441d5dd185b6c9e49 (patch)
tree98cc3f81ad7ff554e10fc263abfb7727a438cc5a /drivers/xen/xenbus/xenbus_probe.c
parentdrivers/xen/xenbus/xenbus_client.c: cleanup kerneldoc (diff)
downloadlinux-1107ba885e46964316c083d441d5dd185b6c9e49.tar.xz
linux-1107ba885e46964316c083d441d5dd185b6c9e49.zip
xen: add xenfs to allow usermode <-> Xen interaction
The xenfs filesystem exports various interfaces to usermode. Initially this exports a file to allow usermode to interact with xenbus/xenstore. Traditionally this appeared in /proc/xen. Rather than extending procfs, this patch adds a backward-compat mountpoint on /proc/xen, and provides a xenfs filesystem which can be mounted there. Signed-off-by: Alex Zeffertt <alex.zeffertt@eu.citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/xen/xenbus/xenbus_probe.c')
-rw-r--r--drivers/xen/xenbus/xenbus_probe.c28
1 files changed, 22 insertions, 6 deletions
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index b2a03184a246..773d1cf23283 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -40,6 +40,7 @@
#include <linux/ctype.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
+#include <linux/proc_fs.h>
#include <linux/notifier.h>
#include <linux/kthread.h>
#include <linux/mutex.h>
@@ -55,7 +56,10 @@
#include "xenbus_comms.h"
#include "xenbus_probe.h"
+
int xen_store_evtchn;
+EXPORT_SYMBOL(xen_store_evtchn);
+
struct xenstore_domain_interface *xen_store_interface;
static unsigned long xen_store_mfn;
@@ -166,6 +170,9 @@ static int read_backend_details(struct xenbus_device *xendev)
return read_otherend_details(xendev, "backend-id", "backend");
}
+static struct device_attribute xenbus_dev_attrs[] = {
+ __ATTR_NULL
+};
/* Bus type for frontend drivers. */
static struct xen_bus_type xenbus_frontend = {
@@ -174,12 +181,13 @@ static struct xen_bus_type xenbus_frontend = {
.get_bus_id = frontend_bus_id,
.probe = xenbus_probe_frontend,
.bus = {
- .name = "xen",
- .match = xenbus_match,
- .uevent = xenbus_uevent,
- .probe = xenbus_dev_probe,
- .remove = xenbus_dev_remove,
- .shutdown = xenbus_dev_shutdown,
+ .name = "xen",
+ .match = xenbus_match,
+ .uevent = xenbus_uevent,
+ .probe = xenbus_dev_probe,
+ .remove = xenbus_dev_remove,
+ .shutdown = xenbus_dev_shutdown,
+ .dev_attrs = xenbus_dev_attrs,
},
};
@@ -852,6 +860,14 @@ static int __init xenbus_probe_init(void)
if (!xen_initial_domain())
xenbus_probe(NULL);
+#ifdef CONFIG_XEN_COMPAT_XENFS
+ /*
+ * Create xenfs mountpoint in /proc for compatibility with
+ * utilities that expect to find "xenbus" under "/proc/xen".
+ */
+ proc_mkdir("xen", NULL);
+#endif
+
return 0;
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