Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6
[kernel.git] / fs / cifs / file.c
index 058b390..9b11a8f 100644 (file)
@@ -839,8 +839,32 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
 
                } else {
                        /* if rc == ERR_SHARING_VIOLATION ? */
-                       rc = 0; /* do not change lock type to unlock
-                                  since range in use */
+                       rc = 0;
+
+                       if (lockType & LOCKING_ANDX_SHARED_LOCK) {
+                               pfLock->fl_type = F_WRLCK;
+                       } else {
+                               rc = CIFSSMBLock(xid, tcon, netfid, length,
+                                       pfLock->fl_start, 0, 1,
+                                       lockType | LOCKING_ANDX_SHARED_LOCK,
+                                       0 /* wait flag */);
+                               if (rc == 0) {
+                                       rc = CIFSSMBLock(xid, tcon, netfid,
+                                               length, pfLock->fl_start, 1, 0,
+                                               lockType |
+                                               LOCKING_ANDX_SHARED_LOCK,
+                                               0 /* wait flag */);
+                                       pfLock->fl_type = F_RDLCK;
+                                       if (rc != 0)
+                                               cERROR(1, ("Error unlocking "
+                                               "previously locked range %d "
+                                               "during test of lock", rc));
+                                       rc = 0;
+                               } else {
+                                       pfLock->fl_type = F_WRLCK;
+                                       rc = 0;
+                               }
+                       }
                }
 
                FreeXid(xid);