[CIFS] add hostname field to TCP_Server_Info struct

...and populate it with the hostname portion of the UNC string.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 4ff8179..3525082 100644 (file)
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -139,6 +139,7 @@ struct TCP_Server_Info {
        /* 15 character server name + 0x20 16th byte indicating type = srv */
        char server_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
        char unicode_server_Name[SERVER_NAME_LEN_WITH_NULL * 2];
+       char *hostname; /* hostname portion of UNC string */
        struct socket *ssocket;
        union {
                struct sockaddr_in sockAddr;

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 58c509e..98ec57f 100644 (file)
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -752,6 +752,7 @@ multi_t2_fnd:
        }
        write_unlock(&GlobalSMBSeslock);
 
+       kfree(server->hostname);
        kfree(server);
        if (length  > 0)
                mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
@@ -760,6 +761,34 @@ multi_t2_fnd:
        return 0;
 }
 
+/* extract the host portion of the UNC string */
+static char *
+extract_hostname(const char *unc)
+{
+       const char *src;
+       char *dst, *delim;
+       unsigned int len;
+
+       /* skip double chars at beginning of string */
+       /* BB: check validity of these bytes? */
+       src = unc + 2;
+
+       /* delimiter between hostname and sharename is always '\\' now */
+       delim = strchr(src, '\\');
+       if (!delim)
+               return ERR_PTR(-EINVAL);
+
+       len = delim - src;
+       dst = kmalloc((len + 1), GFP_KERNEL);
+       if (dst == NULL)
+               return ERR_PTR(-ENOMEM);
+
+       memcpy(dst, src, len);
+       dst[len] = '\0';
+
+       return dst;
+}
+
 static int
 cifs_parse_mount_options(char *options, const char *devname,
                         struct smb_vol *vol)
@@ -1900,6 +1929,12 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
                        /* BB Add code for ipv6 case too */
                        srvTcp->ssocket = csocket;
                        srvTcp->protocolType = IPV4;
+                       srvTcp->hostname = extract_hostname(volume_info.UNC);
+                       if (IS_ERR(srvTcp->hostname)) {
+                               rc = PTR_ERR(srvTcp->hostname);
+                               sock_release(csocket);
+                               goto out;
+                       }
                        init_waitqueue_head(&srvTcp->response_q);
                        init_waitqueue_head(&srvTcp->request_q);
                        INIT_LIST_HEAD(&srvTcp->pending_mid_q);
@@ -1914,6 +1949,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
                                cERROR(1, ("error %d create cifsd thread", rc));
                                srvTcp->tsk = NULL;
                                sock_release(csocket);
+                               kfree(srvTcp->hostname);
                                goto out;
                        }
                        wait_for_completion(&cifsd_complete);