[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>

2 files changed, 37 insertions, 0 deletions

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 4ff8179df7ec..3525082f5e58 100644
--- 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 58c509e6ac6a..98ec57ff4d98 100644
--- 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);