- 2.6.17 port work build breaks, but the patch set is relativly stable

[linux-flexiantxendom0-3.2.10.git] / drivers / block / aoe / aoechr.c

diff --git a/drivers/block/aoe/aoechr.c b/drivers/block/aoe/aoechr.c
index 41ae0ed..5327f55 100644 (file)
--- a/drivers/block/aoe/aoechr.c
+++ b/drivers/block/aoe/aoechr.c
@@ -13,6 +13,7 @@ enum {
        MINOR_ERR = 2,
        MINOR_DISCOVER,
        MINOR_INTERFACES,
+       MINOR_REVALIDATE,
        MSGSZ = 2048,
        NARGS = 10,
        NMSG = 100,             /* message backlog to retain */
@@ -41,6 +42,7 @@ static struct aoe_chardev chardevs[] = {
        { MINOR_ERR, "err" },
        { MINOR_DISCOVER, "discover" },
        { MINOR_INTERFACES, "interfaces" },
+       { MINOR_REVALIDATE, "revalidate" },
 };
 
 static int
@@ -62,6 +64,39 @@ interfaces(const char __user *str, size_t size)
        return 0;
 }
 
+static int
+revalidate(const char __user *str, size_t size)
+{
+       int major, minor, n;
+       ulong flags;
+       struct aoedev *d;
+       char buf[16];
+
+       if (size >= sizeof buf)
+               return -EINVAL;
+       buf[sizeof buf - 1] = '\0';
+       if (copy_from_user(buf, str, size))
+               return -EFAULT;
+
+       /* should be e%d.%d format */
+       n = sscanf(buf, "e%d.%d", &major, &minor);
+       if (n != 2) {
+               printk(KERN_ERR "aoe: %s: invalid device specification\n",
+                       __FUNCTION__);
+               return -EINVAL;
+       }
+       d = aoedev_by_aoeaddr(major, minor);
+       if (!d)
+               return -EINVAL;
+
+       spin_lock_irqsave(&d->lock, flags);
+       d->flags |= DEVFL_PAUSE;
+       spin_unlock_irqrestore(&d->lock, flags);
+       aoecmd_cfg(major, minor);
+
+       return 0;
+}
+
 void
 aoechr_error(char *msg)
 {
@@ -114,6 +149,8 @@ aoechr_write(struct file *filp, const char __user *buf, size_t cnt, loff_t *offp
        case MINOR_INTERFACES:
                ret = interfaces(buf, cnt);
                break;
+       case MINOR_REVALIDATE:
+               ret = revalidate(buf, cnt);
        }
        if (ret == 0)
                ret = cnt;