[Devel] [PATCH] smbfs: Make conn_pid a struct pid

[Eric W. Biederman]

smbfs keeps track of the user space server process in conn_pid.
This converts that track to use a struct pid instead of pid_t.
This keeps us safe from pid wrap around issues and prepares the way
for the pid namespace.

Signed-off-by: Eric W. Biederman <ebiederm at xmission.com>
---
 fs/smbfs/inode.c          |    5 +++--
 fs/smbfs/proc.c           |    6 +++---
 fs/smbfs/smbiod.c         |    5 +++--
 include/linux/smb_fs_sb.h |    2 +-
 4 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/fs/smbfs/inode.c b/fs/smbfs/inode.c
index 4af4cd7..84dfe3f 100644
--- a/fs/smbfs/inode.c
+++ b/fs/smbfs/inode.c
@@ -482,12 +482,13 @@ smb_put_super(struct super_block *sb)
 	smb_close_socket(server);
 
 	if (server->conn_pid)
-		kill_proc(server->conn_pid, SIGTERM, 1);
+		kill_pid(server->conn_pid, SIGTERM, 1);
 
 	kfree(server->ops);
 	smb_unload_nls(server);
 	sb->s_fs_info = NULL;
 	smb_unlock_server(server);
+	put_pid(server->conn_pid);
 	kfree(server);
 }
 
@@ -530,7 +531,7 @@ static int smb_fill_super(struct super_block *sb, void *raw_data, int silent)
 	INIT_LIST_HEAD(&server->xmitq);
 	INIT_LIST_HEAD(&server->recvq);
 	server->conn_error = 0;
-	server->conn_pid = 0;
+	server->conn_pid = NULL;
 	server->state = CONN_INVALID; /* no connection yet */
 	server->generation = 0;
 
diff --git a/fs/smbfs/proc.c b/fs/smbfs/proc.c
index a5ced9e..feac460 100644
--- a/fs/smbfs/proc.c
+++ b/fs/smbfs/proc.c
@@ -877,7 +877,7 @@ smb_newconn(struct smb_sb_info *server, struct smb_conn_opt *opt)
 		goto out_putf;
 
 	server->sock_file = filp;
-	server->conn_pid = current->pid;
+	server->conn_pid = get_pid(task_pid(current));
 	server->opt = *opt;
 	server->generation += 1;
 	server->state = CONN_VALID;
@@ -971,8 +971,8 @@ smb_newconn(struct smb_sb_info *server, struct smb_conn_opt *opt)
 	}
 
 	VERBOSE("protocol=%d, max_xmit=%d, pid=%d capabilities=0x%x\n",
-		server->opt.protocol, server->opt.max_xmit, server->conn_pid,
-		server->opt.capabilities);
+		server->opt.protocol, server->opt.max_xmit,
+		pid_nr(server->conn_pid), server->opt.capabilities);
 
 	/* FIXME: this really should be done by smbmount. */
 	if (server->opt.max_xmit > SMB_MAX_PACKET_SIZE) {
diff --git a/fs/smbfs/smbiod.c b/fs/smbfs/smbiod.c
index e675404..89eaf31 100644
--- a/fs/smbfs/smbiod.c
+++ b/fs/smbfs/smbiod.c
@@ -152,7 +152,7 @@ int smbiod_retry(struct smb_sb_info *server)
 {
 	struct list_head *head;
 	struct smb_request *req;
-	pid_t pid = server->conn_pid;
+	struct pid *pid = get_pid(server->conn_pid);
 	int result = 0;
 
 	VERBOSE("state: %d\n", server->state);
@@ -222,7 +222,7 @@ int smbiod_retry(struct smb_sb_info *server)
 	/*
 	 * Note: use the "priv" flag, as a user process may need to reconnect.
 	 */
-	result = kill_proc(pid, SIGUSR1, 1);
+	result = kill_pid(pid, SIGUSR1, 1);
 	if (result) {
 		/* FIXME: this is most likely fatal, umount? */
 		printk(KERN_ERR "smb_retry: signal failed [%d]\n", result);
@@ -233,6 +233,7 @@ int smbiod_retry(struct smb_sb_info *server)
 	/* FIXME: The retried requests should perhaps get a "time boost". */
 
 out:
+	put_pid(pid);
 	return result;
 }
 
diff --git a/include/linux/smb_fs_sb.h b/include/linux/smb_fs_sb.h
index 5b4ae2c..3aa97aa 100644
--- a/include/linux/smb_fs_sb.h
+++ b/include/linux/smb_fs_sb.h
@@ -55,7 +55,7 @@ struct smb_sb_info {
 	 * generation is incremented.
 	 */
 	unsigned int generation;
-	pid_t conn_pid;
+	struct pid *conn_pid;
 	struct smb_conn_opt opt;
 	wait_queue_head_t conn_wq;
 	int conn_complete;
-- 
1.4.4.1.g278f

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