[PATCH] convert /proc/devices to use seq_file interface
[linux-2.6.git] / fs / char_dev.c
index 3b1b1ee..21195c4 100644 (file)
@@ -35,7 +35,7 @@ static struct char_device_struct {
        unsigned int major;
        unsigned int baseminor;
        int minorct;
-       const char *name;
+       char name[64];
        struct file_operations *fops;
        struct cdev *cdev;              /* will die */
 } *chrdevs[MAX_PROBE_HASH];
@@ -46,34 +46,84 @@ static inline int major_to_index(int major)
        return major % MAX_PROBE_HASH;
 }
 
-/* get char device names in somewhat random order */
-int get_chrdev_list(char *page)
-{
+struct chrdev_info {
+       int index;
        struct char_device_struct *cd;
-       int i, len;
+};
 
-       len = sprintf(page, "Character devices:\n");
+void *get_next_chrdev(void *dev)
+{
+       struct chrdev_info *info;
 
+       if (dev == NULL) {
+               info = kmalloc(sizeof(*info), GFP_KERNEL);
+               if (!info)
+                       goto out;
+               info->index=0;
+               info->cd = chrdevs[info->index];
+               if (info->cd)
+                       goto out;
+       } else {
+               info = dev;
+       }
+
+       while (info->index < ARRAY_SIZE(chrdevs)) {
+               if (info->cd)
+                       info->cd = info->cd->next;
+               if (info->cd)
+                       goto out;
+               /*
+                * No devices on this chain, move to the next
+                */
+               info->index++;
+               info->cd = (info->index < ARRAY_SIZE(chrdevs)) ?
+                       chrdevs[info->index] : NULL;
+               if (info->cd)
+                       goto out;
+       }
+
+out:
+       return info;
+}
+
+void *acquire_chrdev_list(void)
+{
        down(&chrdevs_lock);
+       return get_next_chrdev(NULL);
+}
+
+void release_chrdev_list(void *dev)
+{
+       up(&chrdevs_lock);
+       kfree(dev);
+}
+
+
+int count_chrdev_list(void)
+{
+       struct char_device_struct *cd;
+       int i, count;
+
+       count = 0;
+
        for (i = 0; i < ARRAY_SIZE(chrdevs) ; i++) {
-               for (cd = chrdevs[i]; cd; cd = cd->next) {
-                       /*
-                        * if the current name, plus the 5 extra characters
-                        * in the device line for this entry
-                        * would run us off the page, we're done
-                        */
-                       if ((len+strlen(cd->name) + 5) >= PAGE_SIZE)
-                               goto page_full;
-
-
-                       len += sprintf(page+len, "%3d %s\n",
-                                      cd->major, cd->name);
-               }
+               for (cd = chrdevs[i]; cd; cd = cd->next)
+                       count++;
        }
-page_full:
-       up(&chrdevs_lock);
 
-       return len;
+       return count;
+}
+
+int get_chrdev_info(void *dev, int *major, char **name)
+{
+       struct chrdev_info *info = dev;
+
+       if (info->cd == NULL)
+               return 1;
+
+       *major = info->cd->major;
+       *name = info->cd->name;
+       return 0;
 }
 
 /*
@@ -121,7 +171,7 @@ __register_chrdev_region(unsigned int major, unsigned int baseminor,
        cd->major = major;
        cd->baseminor = baseminor;
        cd->minorct = minorct;
-       cd->name = name;
+       strncpy(cd->name,name, 64);
 
        i = major_to_index(major);