1 files changed, 37 insertions, 0 deletions

diff --git a/drivers/block/aoe/aoechr.c b/drivers/block/aoe/aoechr.c
index 41ae0ede619a..5327f553b4f5 100644
--- 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;