Cluster Project branch, master, updated. cluster-2.99.04-31-g4f32341

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- Log -----------------------------------------------------------------
commit 4f32341cc111bd6e8dc888b483db2e7951b96c2a
Author: Benjamin Marzinski <bmarzins@redhat.com>
Date:   Thu Jun 19 15:44:27 2008 -0500

    [gnbd-kernel] bz 449812: disallow sending requests after a send has failed.
    
    This fix adds a "corrupt" flag to the gnbd device structure. This flag is
    cleared when a new socket connection is opened to the server. It is set
    whenever a send fails.  After this all future sends will fail, and the receiver
    process will stop accepting replies as soon as it notices the flag.

-----------------------------------------------------------------------

Summary of changes:
 gnbd-kernel/src/gnbd.c |   13 +++++++++++++
 gnbd-kernel/src/gnbd.h |    1 +
 2 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/gnbd-kernel/src/gnbd.c b/gnbd-kernel/src/gnbd.c
index a52252d..5cc34fb 100644
--- a/gnbd-kernel/src/gnbd.c
+++ b/gnbd-kernel/src/gnbd.c
@@ -388,6 +388,12 @@ int __gnbd_send_req(struct gnbd_device *dev, struct socket *sock,
 
 	down(&dev->tx_lock);
 
+	if (dev->corrupt) {
+		printk(KERN_ERR "%s: Attempted to send on a faulty socket\n",
+		       dev->disk->disk_name);
+		result = -EBADFD;
+		goto error_out;
+	}
 	if (!sock) {
 		printk(KERN_ERR "%s: Attempted send on closed socket\n",
 				dev->disk->disk_name);
@@ -440,6 +446,7 @@ int __gnbd_send_req(struct gnbd_device *dev, struct socket *sock,
 	return 0;
 
 send_error_out:
+	dev->corrupt = 1;
 	dev->current_request = NULL;
 	wake_up(&dev->tx_wait);
 error_out:
@@ -502,6 +509,11 @@ int gnbd_do_it(struct gnbd_device *dev)
 	BUG_ON(dev->magic != GNBD_MAGIC);
 
 	while((result = sock_xmit(sock, 0, &reply,sizeof(reply), MSG_WAITALL, 1)) > 0){
+		if (dev->corrupt) {
+			printk(KERN_ERR "%s: faulty socket\n",dev->disk->disk_name);
+			return -EBADFD;
+		}
+
 		if (ntohl(reply.magic) == GNBD_KEEP_ALIVE_MAGIC)
 			/* FIXME -- I should reset the wait time here */
 			continue;
@@ -771,6 +783,7 @@ static int gnbd_ctl_ioctl(struct inode *inode, struct file *file,
 		}
 		dev->file = file;
 		dev->sock = SOCKET_I(inode);
+		dev->corrupt = 0;
 		dev->receiver_pid = current->pid; 
 		blk_run_queue(dev->disk->queue);
 		error = gnbd_do_it(dev);
diff --git a/gnbd-kernel/src/gnbd.h b/gnbd-kernel/src/gnbd.h
index 7af7f0e..b0b45dc 100644
--- a/gnbd-kernel/src/gnbd.h
+++ b/gnbd-kernel/src/gnbd.h
@@ -45,6 +45,7 @@ struct gnbd_device {
 	struct block_device *bdev;
 	struct request *current_request;
 	wait_queue_head_t tx_wait;
+	int corrupt;
 };
 
 #endif /* __KERNEL__ */


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