vserver 1.9.3

[linux-2.6.git] / drivers / s390 / block / dcssblk.c

diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index ca83f9b..b7a764c 100644 (file)
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -5,6 +5,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/moduleparam.h>
 #include <linux/ctype.h>
 #include <linux/errno.h>
 #include <linux/init.h>
@@ -19,6 +20,7 @@
 //#define DCSSBLK_DEBUG                /* Debug messages on/off */
 #define DCSSBLK_NAME "dcssblk"
 #define DCSSBLK_MINORS_PER_DISK 1
+#define DCSSBLK_PARM_LEN 400
 
 #ifdef DCSSBLK_DEBUG
 #define PRINT_DEBUG(x...) printk(KERN_DEBUG DCSSBLK_NAME " debug: " x)
@@ -34,6 +36,8 @@ static int dcssblk_open(struct inode *inode, struct file *filp);
 static int dcssblk_release(struct inode *inode, struct file *filp);
 static int dcssblk_make_request(struct request_queue *q, struct bio *bio);
 
+static char dcssblk_segments[DCSSBLK_PARM_LEN] = "\0";
+
 static int dcssblk_major;
 static struct block_device_operations dcssblk_devops = {
        .owner   = THIS_MODULE,
@@ -641,6 +645,47 @@ fail:
        return 0;
 }
 
+static void
+dcssblk_check_params(void)
+{
+       int rc, i, j, k;
+       char buf[9];
+       struct dcssblk_dev_info *dev_info;
+
+       for (i = 0; (i < DCSSBLK_PARM_LEN) && (dcssblk_segments[i] != '\0');
+            i++) {
+               for (j = i; (dcssblk_segments[j] != ',')  &&
+                           (dcssblk_segments[j] != '\0') &&
+                           (dcssblk_segments[j] != '(')  &&
+                           (j - i) < 8; j++)
+               {
+                       buf[j-i] = dcssblk_segments[j];
+               }
+               buf[j-i] = '\0';
+               rc = dcssblk_add_store(dcssblk_root_dev, buf, j-i);
+               if ((rc >= 0) && (dcssblk_segments[j] == '(')) {
+                       for (k = 0; buf[k] != '\0'; k++)
+                               buf[k] = toupper(buf[k]);
+                       if (!strncmp(&dcssblk_segments[j], "(local)", 7)) {
+                               down_read(&dcssblk_devices_sem);
+                               dev_info = dcssblk_get_device_by_name(buf);
+                               up_read(&dcssblk_devices_sem);
+                               if (dev_info)
+                                       dcssblk_shared_store(&dev_info->dev,
+                                                            "0\n", 2);
+                       }
+               }
+               while ((dcssblk_segments[j] != ',') &&
+                      (dcssblk_segments[j] != '\0'))
+               {
+                       j++;
+               }
+               if (dcssblk_segments[j] == '\0')
+                       break;
+               i = j;
+       }
+}
+
 /*
  * The init/exit functions.
  */
@@ -689,6 +734,9 @@ dcssblk_init(void)
        }
        dcssblk_major = rc;
        init_rwsem(&dcssblk_devices_sem);
+
+       dcssblk_check_params();
+
        PRINT_DEBUG("...finished!\n");
        return 0;
 }
@@ -696,4 +744,12 @@ dcssblk_init(void)
 module_init(dcssblk_init);
 module_exit(dcssblk_exit);
 
+module_param_string(segments, dcssblk_segments, DCSSBLK_PARM_LEN, 0444);
+MODULE_PARM_DESC(segments, "Name of DCSS segment(s) to be loaded, "
+                "comma-separated list, each name max. 8 chars.\n"
+                "Adding \"(local)\" to segment name equals echoing 0 to "
+                "/sys/devices/dcssblk/<segment name>/shared after loading "
+                "the segment - \n"
+                "e.g. segments=\"mydcss1,mydcss2,mydcss3(local)\"");
+
 MODULE_LICENSE("GPL");