Add case-sensitivity.

Unconditionally handle mount points case-sensitive.
	Unconditionally handle virtual paths case-sensitive.
	Unconditionally handle registry paths case-insensitive.
	Otherwise, accommodate case-sensitivity of given path throughout.
	* cygheap.cc (cygheap_root::set): Get additional caseinsensitive
	parameter and store it.
	* cygheap.h (struct cygheap_root_mount_info): Add member
	caseinsensitive.
	* dlfcn.cc (get_full_path_of_dll): Drop PC_NOFULL parameter from call
	to path_conv::check.
	* environ.cc (pcheck_case): Remove.
	(check_case_init): Remove.
	(known): Drop "check_case" option.
	* exceptions.cc (open_stackdumpfile): Add comment.
	* fhandler.cc (fhandler_base::get_default_fmode): Call pathmatch
	instead of strcasematch.
	* fhandler_disk_file.cc: Accommodate case-sensitivity of given path
	throughout.
	(__DIR_mounts::check_mount): Unconditionally check virtual paths
	case-sensitive.
	(fhandler_disk_file::link): Drop case clash handling.
	(fhandler_disk_file::open): Ditto.
	(fhandler_disk_file::readdir_helper): Drop managed mount code.
	* mount.cc: Remove managed mount code and datastructures.
	(struct opt): Remove "managed" option.  Add "posix=0" and "posix=1"
	options.
	(fillout_mntent): Remove "managed" output.  Add "posix" output.
	* path.cc (struct symlink_info): Remove case_clash member and
	case_check method.
	(pcheck_case): Remove.
	(path_prefix_p): Take additional bool parameter "caseinsensitive".
	(pathnmatch): Ditto.
	(pathmatch): Ditto.
	(mkrelpath): Ditto.
	(fs_info::update): Set caseinsensitive flag according to file system
	name and FILE_CASE_SENSITIVE_SEARCH flag.  Add comment.
	(tfx_chars_managed): Remove.
	(transform_chars): Drop "managed" parameter.  Always use tfx_chars.
	(get_nt_native_path): Drop "managed" parameter.  Make sure drive letters
	are always upper case.
	(getfileattr): Change second parameter to denote caseinsensitivity.
	(path_conv::check): Initialize caseinsensitive to OBJ_CASE_INSENSITIVE.
	Set caseinsensitive according to global obcaseinsensitive flag, file
	system case sensitivity and MOUNT_NOPOSIX mount flag.
	Drop case_clash and all the related code.
	(symlink_worker): Drop case clash handling.
	(symlink_info::set): Drop setting case_clash.
	(symlink_info::case_check): Remove.
	(cwdstuff::set): Add comment.
	(etc::init): Take path_conv instead of PUNICODE_STRING as parameter to
	allow case sensitivity.
	* path.h (enum pathconv_arg): Drop PC_SYM_IGNORE.
	(enum case_checking): Remove.
	(enum path_types): Drop PATH_ENC, add PATH_NOPOSIX flag.
	(struct fs_info): Add caseinsensitive flag and accessor methods.
	(class path_conv): Add caseinsensitive member and define
	objcaseinsensitive method.  Drop case_clash member and isencoded method.
	(pathmatch): Change prototype according to above change.
	(pathnmatch): Ditto.
	(path_prefix_p): Ditto.
	(get_nt_native_path): Ditto.
	(class etc): Ditto.
	(fnunmunge): Remove prototype.
	* shared.cc (shared_info::init_obcaseinsensitive): Initialize
	obcaseinsensitive flag from obcaseinsensitive registry value.
	(shared_info::initialize): Call init_obcaseinsensitive here by the
	first process creating the shared memory.
	* shared_info.h (mount_item::fnmunge): Remove.
	(shared_info::obcaseinsensitive): Rename from obcaseinsensitivity.
	(shared_info::init_obcaseinsensitive): Declare.
	* syscalls.cc (try_to_bin): Add comment.
	* include/sys/mount.h (MOUNT_ENC): Remove flag.
	(MOUNT_NOPOSIX): Add flag.

winsup/cygwin/syscalls.cc

@@ -197,7 +197,7 @@ try_to_bin (path_conv &win32_path, HANDLE h)
   RtlSplitUnicodePath (win32_path.get_nt_native_path (), &root, NULL);
   root.Length -= fname.Length - sizeof (WCHAR);
 
-  /* Open root directory. */
+  /* Open root directory.  All recycler bin ops are caseinsensitive. */
   InitializeObjectAttributes (&attr, &root, OBJ_CASE_INSENSITIVE, NULL, NULL);
   status = NtOpenFile (&rootdir, FILE_TRAVERSE, &attr, &io,
 		       FILE_SHARE_VALID_FLAGS, FILE_OPEN_FOR_BACKUP_INTENT);
@@ -1602,13 +1602,13 @@ rename (const char *oldpath, const char *newpath)
   /* This test is necessary in almost every case, so just do it once here. */
   equal_path = RtlEqualUnicodeString (oldpc.get_nt_native_path (),
 				      newpc.get_nt_native_path (),
-				      TRUE);
+				      oldpc.objcaseinsensitive ());
 
   /* First check if oldpath and newpath only differ by case.  If so, it's
      just a request to change the case of the filename.  By simply setting
      the file attributes to INVALID_FILE_ATTRIBUTES (which translates to
      "file doesn't exist"), all later tests are skipped. */
-  if (newpc.exists () && equal_path)
+  if (oldpc.objcaseinsensitive () && newpc.exists () && equal_path)
     {
       if (RtlEqualUnicodeString (oldpc.get_nt_native_path (),
 				 newpc.get_nt_native_path (),
@@ -1646,7 +1646,7 @@ rename (const char *oldpath, const char *newpath)
 	  newpc.check (newpath, PC_SYM_NOFOLLOW);
 	  if (RtlEqualUnicodeString (oldpc.get_nt_native_path (),
 				     newpc.get_nt_native_path (),
-				     TRUE))
+				     oldpc.objcaseinsensitive ()))
 	    {
 	      res = 0;
 	      goto out;
@@ -1674,7 +1674,7 @@ rename (const char *oldpath, const char *newpath)
 	  newpc.check (newpath, PC_SYM_NOFOLLOW);
 	  if (RtlEqualUnicodeString (oldpc.get_nt_native_path (),
 				     newpc.get_nt_native_path (),
-				     TRUE))
+				     oldpc.objcaseinsensitive ()))
 	    {
 	      res = 0;
 	      goto out;
@@ -2776,7 +2776,8 @@ chroot (const char *newroot)
   else
     {
       getwinenv("PATH="); /* Save the native PATH */
-      cygheap->root.set (path.normalized_path, path.get_win32 ());
+      cygheap->root.set (path.normalized_path, path.get_win32 (),
+			 !!path.objcaseinsensitive ());
       ret = 0;
     }