* ntdll.h (STATUS_LOCK_NOT_GRANTED): Define.

* syscalls.cc (unlink_nt): Handle STATUS_LOCK_NOT_GRANTED same as
	STATUS_SHARING_VIOLATION.  Add lengthy comment to explain why.

winsup/cygwin/ChangeLog

@@ -1,3 +1,9 @@
+2009-04-16  Corinna Vinschen  <corinna@vinschen.de>
+
+	* ntdll.h (STATUS_LOCK_NOT_GRANTED): Define.
+	* syscalls.cc (unlink_nt): Handle STATUS_LOCK_NOT_GRANTED same as
+	STATUS_SHARING_VIOLATION.  Add lengthy comment to explain why.
+
 2009-04-15  Corinna Vinschen  <corinna@vinschen.de>
 
 	* path.cc (path_conv::get_wide_win32_path): Allow relative paths.

winsup/cygwin/ntdll.h

@@ -34,6 +34,7 @@
 #define STATUS_EA_TOO_LARGE           ((NTSTATUS) 0xc0000050)
 #define STATUS_NONEXISTENT_EA_ENTRY   ((NTSTATUS) 0xc0000051)
 #define STATUS_NO_EAS_ON_FILE         ((NTSTATUS) 0xc0000052)
+#define STATUS_LOCK_NOT_GRANTED       ((NTSTATUS) 0xc0000055)
 #define STATUS_DELETE_PENDING         ((NTSTATUS) 0xc0000056)
 #define STATUS_DISK_FULL              ((NTSTATUS) 0xc000007f)
 #define STATUS_WORKING_SET_QUOTA      ((NTSTATUS) 0xc00000a1)

winsup/cygwin/syscalls.cc

@@ -470,8 +470,18 @@ unlink_nt (path_conv &pc)
      we can go straight to setting the delete disposition flag. */
   bin_status bin_stat = dont_move;
   status = NtOpenFile (&fh, access, &attr, &io, FILE_SHARE_DELETE, flags);
-  if (status == STATUS_SHARING_VIOLATION)
-    {
+  if (status == STATUS_SHARING_VIOLATION || status == STATUS_LOCK_NOT_GRANTED)
+    {
+      /* STATUS_LOCK_NOT_GRANTED can be generated under not quite clear
+	 circumstances when trying to open a file on NFS with FILE_SHARE_DELETE
+	 only.  This has been observed with SFU 3.5 if the NFS share has been
+	 mounted under a drive letter.  It's not generated for all files, but
+	 only for some.  If it's generated once for a file, it will be
+	 generated all the time.  It looks like wrong file state information
+	 is stored within the NFS client, for no apparent reason, which never
+	 times out.  Opening the file with FILE_SHARE_VALID_FLAGS will work,
+	 though, and it is then possible to delete the file quite normally. */
+
       /* Bin is only accessible locally. */
       if (!pc.isremote ())
 	bin_stat = move_to_bin;