* fhandler.h (class fhandler_dev_raw): Add members devbufalloc and

	devbufalign.
	(class fhandler_dev_floppy): Remove member bytes_per_sector;
	* fhandler_floppy.cc (bytes_per_sector): Define as devbufalign.
	(fhandler_dev_floppy::open): Set devbufalign to a multiple of the
	sector size and handle devbuf allocation and alignment in !O_DIRECT
	case here.  Change comment accordingly.
	Call FSCTL_ALLOW_EXTENDED_DASD_IO for partitions as well.
	(fhandler_dev_floppy::raw_write): Fix comment.  Rewrite and fix
	writing behaviour when application uses read and lseek.
	(fhandler_dev_floppy::lseek): Use rounddown macro.  Call
	SetFilePointerEx rather than the old SetFilePointer.
	(fhandler_dev_floppy::ioctl): Reformat switch.  Call
	IOCTL_DISK_UPDATE_PROPERTIES rather than IOCTL_DISK_UPDATE_DRIVE_SIZE
	in BLKRRPART case.  Support BLKIOMIN, BLKIOOPT, BLKPBSZGET and
	BLKALIGNOFF.
	* fhandler_raw.cc (fhandler_dev_raw::fhandler_dev_raw): Initialize
	all devbuf-related members.
	(fhandler_dev_raw::~fhandler_dev_raw): Delete devbufalloc rather than
	devbuf.
	(fhandler_dev_raw::open): Drop allocating devbuf.
	(fhandler_dev_raw::dup): Allocate devbufalloc and set devbuf to support
	new sector-aligned devbuf handling.
	(fhandler_dev_raw::fixup_after_exec): Ditto.
	* fhandler_tape.cc (fhandler_dev_tape::open): Ditto, set devbufalign
	to 1.
	* include/cygwin/fs.h (BLKIOMIN): Define.
	(BLKIOOPT): Define.
	(BLKALIGNOFF): Define.
	(BLKPBSZGET): Define.

1 files changed, 2 insertions, 2 deletions

diff --git a/winsup/cygwin/fhandler_tape.cc b/winsup/cygwin/fhandler_tape.cc
index 5d1a7f9e6..67d6f5c8d 100644
--- a/winsup/cygwin/fhandler_tape.cc
+++ b/winsup/cygwin/fhandler_tape.cc
@@ -1214,9 +1214,9 @@ fhandler_dev_tape::open (int flags, mode_t)
       if (!(flags & O_DIRECT))
 	{
 	  devbufsiz = mt.drive (driveno ())->dp ()->MaximumBlockSize;
-	  devbuf = new char [devbufsiz];
+	  devbufalign = 1;
+	  devbufalloc = devbuf = new char [devbufsiz];
 	}
-      devbufstart = devbufend = 0;
     }
   else
     ReleaseMutex (mt_mtx);