* smallprint.cc (__small_vswprintf): Fix uninitialized usage of `w'.

Revamp advisory file locking to avoid cross reference pointers as well
	as to allow BSD flock semantics.  More agressively delete unused nodes
	and sync objects.
	* fhandler.h (fhandler_base::ino): Rename from namehash.  Fix comment.
	(fhandler_base::node): Remove.
	(fhandler_base::unique_id): Add.
	(fhandler_base::del_my_locks): New method.
	(get_ino): Rename from get_namehash.  Change usage throughout Cygwin.
	(get_unique_id): New method.
	* fhandler.cc (fhandler_base::close): Call own del_my_locks method.
	Fix comment.
	(fhandler_base::fhandler_base): Accommodate new and changed members.
	(fhandler_base::fixup_after_fork): Call del_my_locks.
	(fhandler_base::fixup_after_exec): Ditto for files with close-on-exec
	flag set.
	* fhandler_disk_file.cc (get_ino_by_handle): Rename from
	readdir_get_ino_by_handle.  Accommodate throughout.
	(fhandler_base::open_fs): Fill ino with inode number if FS has good
	inodes.  Allocate a LUID and store in unique_id to recognize file
	descriptors referencing the same file object.
	* flock.cc: Drop flock TODO comments.  Use explicit types __dev32_t
	and __ino64_t instead of dev_t and ino_t.
	(LOCK_OBJ_NAME_LEN): Change to reflect longer lf_id length.
	(get_obj_handle_count): New method.
	(lockf_t::lf_id): Change type to long long.
	(inode_t::get_lock_obj_handle_count): Drop in favor of static function
	get_obj_handle_count.
	(inode_t::del_locks): Remove.
	(inode_t::get): Add create_if_missing flag argument.
	(inode_t::del_my_locks): Reimplement to handle POSIX and BSD flock
	locks.  Return if node can be deleted or not.
	(inode_t::~inode_t): Ditto.  Close handles to i_dir and i_mtx.
	(fixup_lockf_after_fork): Remove.
	(fhandler_base::del_my_locks): New method.
	(fixup_lockf_after_exec): Check if node can be deleted.
	(inode_t::get): Only create node if create_if_missing is set.  Lock
	the returned node here before unlocking the node list.
	(inode_t::get_all_locks_list): Accommodate new lf_id length.
	(inode_t::create_lock_obj): Ditto.
	(lockf_t::open_lock_obj): Ditto.  Change return type to bool.  De-const.
	Set lf_obj instead of returning a handle.
	(lockf_t::del_lock_obj): Call SetEvent only if new incoming parameters
	allow it.  Explain how it's supposed to work.
	(fhandler_disk_file::lock): Only fetch file length in SEEK_END case.
	Use NtQueryInformationFile(FileStandardInformation) instead of
	calling fstat_by_handle.  Always unlock node before returning.
	Use fhandler's unique id to create lf_id for BSD flock locks.
	Rely on node lock from inode_t::get.  Call del_lock_obj on removed
	locks here to allow explicit unlocking.  Delete node if no lock exists
	on the file anymore.
	(lf_setlock): Get file handle as additional parameter.  Handle the fact
	that lf_getblock now always opens the attached event object.  Reactivate
	erroneously applied patch which deactivates setting thread priority.
	Additionally handle blocking on BSD flock locks.
	(lf_clearlock): Get file handle as additional parameter.
	(lf_getlock): Close event handle opened by lf_getblock.
	(lf_getblock): Open potentially blocking event object here and check
	its signal state if it's a BSD flock lock.
	(lf_wakelock): Get file handle as additional parameter.
	* fork.cc (frok::child): Drop call to fixup_lockf_after_fork.
	* ntdll.h (struct _EVENT_BASIC_INFORMATION): Define.
	(enum _EVENT_INFORMATION_CLASS): Define.
	(NtQueryEvent): Declare.

	* fhandler.h (fhandler_base::fs_flags): Remove.
	(fhandler_base::set_fs_flags): Remove.
	(fhandler_base::get_fs_flags): Remove.
	* fhandler.cc (fhandler_base::write): Check for sparse file using
	pc.fs_flags().
	* fhandler_disk_file.cc (fhandler_disk_file::ftruncate): Ditto.

	The return of the volume serial number in fs_info.
	* fhandler.h (get_dev): New method.
	* fhandler_disk_file.cc (fhandler_base::fstat_by_handle): Drop call to
	NtQueryVolumeInformationFile(FileFsVolumeInformation).  Just use
	get_dev() method.
	* fhandler_fifo.cc (fhandler_fifo::open) Use device ID and inode number
	to generate fifo name.
	* path.h (fs_info::sernum): New member.
	(fs_info::serial_number): New method.
	(path_conv::fs_serial_number): New method.
	* path.cc (fs_info::update): Fetch volume serial number and store in
	sernum.

winsup/cygwin/fhandler.cc

@@ -736,7 +736,7 @@ fhandler_base::write (const void *ptr, size_t len)
 						 FilePositionInformation))
 	  && fpi.CurrentByteOffset.QuadPart
 	     >= fsi.EndOfFile.QuadPart + (128 * 1024)
-	  && get_fs_flags (FILE_SUPPORTS_SPARSE_FILES))
+	  && (pc.fs_flags () & FILE_SUPPORTS_SPARSE_FILES))
 	{
 	  /* If the file system supports sparse files and the application
 	     is writing after a long seek beyond EOF, convert the file to
@@ -1004,13 +1004,13 @@ fhandler_base::pwrite (void *, size_t, _off64_t)
 int
 fhandler_base::close ()
 {
-  extern void del_my_locks (inode_t *);
   int res = -1;
 
   syscall_printf ("closing '%s' handle %p", get_name (), get_handle ());
-  /* Delete all POSIX locks on the file. */
-  if (node)
-    del_my_locks (node);
+  /* Delete all POSIX locks on the file.  Delete all flock locks on the
+     file if this is the last reference to this file. */
+  if (unique_id)
+    del_my_locks (false);
   if (nohandle () || CloseHandle (get_handle ()))
     res = 0;
   else
@@ -1261,15 +1261,14 @@ fhandler_base::fhandler_base () :
   open_status (),
   access (0),
   io_handle (NULL),
-  namehash (0),
+  ino (0),
   openflags (0),
   rabuf (NULL),
   ralen (0),
   raixget (0),
   raixput (0),
   rabuflen (0),
-  node (NULL),
-  fs_flags (0),
+  unique_id (0),
   archetype (NULL),
   usecount (0)
 {
@@ -1340,10 +1339,9 @@ fhandler_base::fixup_after_fork (HANDLE parent)
     fork_fixup (parent, io_handle, "io_handle");
   if (get_overlapped ())
     setup_overlapped ();
-  /* POSIX locks are not inherited across fork.  The lock structures
-     are deleted globally in fixup_lockf_after_fork.  Here we just
-     have to reset the pointer. */
-  node = NULL;
+  /* POSIX locks are not inherited across fork. */
+  if (unique_id)
+    del_my_locks (true);
 }
 
 void
@@ -1352,6 +1350,8 @@ fhandler_base::fixup_after_exec ()
   debug_printf ("here for '%s'", get_name ());
   if (get_overlapped ())
     setup_overlapped ();
+  if (unique_id && close_on_exec ())
+    del_my_locks (false);
 }
 
 bool