[Xen-changelog] [xen-unstable] Merge.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Steven Smith <ssmith@xxxxxxxxxxxxx>
# Node ID 509ff527c59d2ea8aca36f901d0f3fe67f4d52c8
# Parent  c620b16d4063a824b5536b76b90e45d2b0e647e5
# Parent  7e79259c2c170eebe111b2c242c2ed9d17fdd4c3
Merge.
---
 linux-2.6-xen-sparse/drivers/xen/evtchn/evtchn.c |    3 
 linux-2.6-xen-sparse/include/xen/public/evtchn.h |    3 
 tools/libxc/xc_linux.c                           |   82 +++++++++++++++++++++--
 tools/libxc/xenctrl.h                            |   10 ++
 4 files changed, 86 insertions(+), 12 deletions(-)

diff -r c620b16d4063 -r 509ff527c59d 
linux-2.6-xen-sparse/drivers/xen/evtchn/evtchn.c
--- a/linux-2.6-xen-sparse/drivers/xen/evtchn/evtchn.c  Fri Sep 29 14:42:04 
2006 +0100
+++ b/linux-2.6-xen-sparse/drivers/xen/evtchn/evtchn.c  Fri Sep 29 14:42:49 
2006 +0100
@@ -419,10 +419,9 @@ static struct file_operations evtchn_fop
 };
 
 static struct miscdevice evtchn_miscdev = {
-       .minor        = EVTCHN_MINOR,
+       .minor        = MISC_DYNAMIC_MINOR,
        .name         = "evtchn",
        .fops         = &evtchn_fops,
-       .devfs_name   = "misc/evtchn",
 };
 
 static int __init evtchn_init(void)
diff -r c620b16d4063 -r 509ff527c59d 
linux-2.6-xen-sparse/include/xen/public/evtchn.h
--- a/linux-2.6-xen-sparse/include/xen/public/evtchn.h  Fri Sep 29 14:42:04 
2006 +0100
+++ b/linux-2.6-xen-sparse/include/xen/public/evtchn.h  Fri Sep 29 14:42:49 
2006 +0100
@@ -32,9 +32,6 @@
 
 #ifndef __LINUX_PUBLIC_EVTCHN_H__
 #define __LINUX_PUBLIC_EVTCHN_H__
-
-/* /dev/xen/evtchn resides at device number major=10, minor=201 */
-#define EVTCHN_MINOR 201
 
 /*
  * Bind a fresh port to VIRQ @virq.
diff -r c620b16d4063 -r 509ff527c59d tools/libxc/xc_linux.c
--- a/tools/libxc/xc_linux.c    Fri Sep 29 14:42:04 2006 +0100
+++ b/tools/libxc/xc_linux.c    Fri Sep 29 14:42:49 2006 +0100
@@ -133,27 +133,95 @@ int do_xen_hypercall(int xc_handle, priv
                       (unsigned long)hypercall);
 }
 
+#define MTAB "/proc/mounts"
+#define MAX_PATH 255
+#define _STR(x) #x
+#define STR(x) _STR(x)
+
+static int find_sysfsdir(char *sysfsdir)
+{
+    FILE *fp;
+    char type[MAX_PATH + 1];
+
+    if ( (fp = fopen(MTAB, "r")) == NULL )
+        return -1;
+
+    while ( fscanf(fp, "%*s %"
+                   STR(MAX_PATH)
+                   "s %"
+                   STR(MAX_PATH)
+                   "s %*s %*d %*d\n",
+                   sysfsdir, type) == 2 )
+    {
+        if ( strncmp(type, "sysfs", 5) == 0 )
+            break;
+    }
+
+    fclose(fp);
+
+    return ((strncmp(type, "sysfs", 5) == 0) ? 0 : -1);
+}
+
+int xc_find_device_number(const char *name)
+{
+    FILE *fp;
+    int i, major, minor;
+    char sysfsdir[MAX_PATH + 1];
+    static char *classlist[] = { "xen", "misc" };
+
+    for ( i = 0; i < (sizeof(classlist) / sizeof(classlist[0])); i++ )
+    {
+        if ( find_sysfsdir(sysfsdir) < 0 )
+            goto not_found;
+
+        /* <base>/class/<classname>/<devname>/dev */
+        strncat(sysfsdir, "/class/", MAX_PATH);
+        strncat(sysfsdir, classlist[i], MAX_PATH);
+        strncat(sysfsdir, "/", MAX_PATH);
+        strncat(sysfsdir, name, MAX_PATH);
+        strncat(sysfsdir, "/dev", MAX_PATH);
+
+        if ( (fp = fopen(sysfsdir, "r")) != NULL )
+            goto found;
+    }
+
+ not_found:
+    errno = -ENOENT;
+    return -1;
+
+ found:
+    if ( fscanf(fp, "%d:%d", &major, &minor) != 2 )
+    {
+        fclose(fp);
+        goto not_found;
+    }
+
+    fclose(fp);
+
+    return makedev(major, minor);
+}
+
 #define EVTCHN_DEV_NAME  "/dev/xen/evtchn"
-#define EVTCHN_DEV_MAJOR 10
-#define EVTCHN_DEV_MINOR 201
 
 int xc_evtchn_open(void)
 {
     struct stat st;
     int fd;
+    int devnum;
+
+    devnum = xc_find_device_number("evtchn");
 
     /* Make sure any existing device file links to correct device. */
-    if ((lstat(EVTCHN_DEV_NAME, &st) != 0) || !S_ISCHR(st.st_mode) ||
-        (st.st_rdev != makedev(EVTCHN_DEV_MAJOR, EVTCHN_DEV_MINOR)))
+    if ( (lstat(EVTCHN_DEV_NAME, &st) != 0) || !S_ISCHR(st.st_mode) ||
+         (st.st_rdev != devnum) )
         (void)unlink(EVTCHN_DEV_NAME);
 
-reopen:
+ reopen:
     if ( (fd = open(EVTCHN_DEV_NAME, O_RDWR)) == -1 )
     {
         if ( (errno == ENOENT) &&
             ((mkdir("/dev/xen", 0755) == 0) || (errno == EEXIST)) &&
-            (mknod(EVTCHN_DEV_NAME, S_IFCHR|0600,
-            makedev(EVTCHN_DEV_MAJOR, EVTCHN_DEV_MINOR)) == 0) )
+             (mknod(EVTCHN_DEV_NAME, S_IFCHR|0600, devnum) == 0) )
             goto reopen;
 
         PERROR("Could not open event channel interface");
diff -r c620b16d4063 -r 509ff527c59d tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h     Fri Sep 29 14:42:04 2006 +0100
+++ b/tools/libxc/xenctrl.h     Fri Sep 29 14:42:49 2006 +0100
@@ -92,6 +92,16 @@ int xc_interface_close(int xc_handle);
 int xc_interface_close(int xc_handle);
 
 /*
+ * KERNEL INTERFACES
+ */
+
+/*
+ * Resolve a kernel device name (e.g., "evtchn", "blktap0") into a kernel
+ * device number. Returns -1 on error (and sets errno).
+ */
+int xc_find_device_number(const char *name);
+
+/*
  * DOMAIN DEBUGGING FUNCTIONS
  */
 

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