* 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, 22 insertions, 7 deletions

diff --git a/winsup/cygwin/fhandler_raw.cc b/winsup/cygwin/fhandler_raw.cc
index a03f7aa..3054bc3 100644
--- a/winsup/cygwin/fhandler_raw.cc
+++ b/winsup/cygwin/fhandler_raw.cc
@@ -13,6 +13,7 @@
 
 #include <cygwin/rdevio.h>
 #include <sys/mtio.h>
+#include <sys/param.h>
 #include "cygerrno.h"
 #include "path.h"
 #include "fhandler.h"
@@ -21,7 +22,14 @@
 /* fhandler_dev_raw */
 
 fhandler_dev_raw::fhandler_dev_raw ()
-  : fhandler_base (), status ()
+  : fhandler_base (),
+    devbufalloc (NULL),
+    devbuf (NULL),
+    devbufalign (0),
+    devbufsiz (0),
+    devbufstart (0),
+    devbufend (0),
+    status ()
 {
   need_fork_fixup (true);
 }
@@ -29,7 +37,7 @@ fhandler_dev_raw::fhandler_dev_raw ()
 fhandler_dev_raw::~fhandler_dev_raw ()
 {
   if (devbufsiz > 1L)
-    delete [] devbuf;
+    delete [] devbufalloc;
 }
 
 int __stdcall
@@ -74,8 +82,6 @@ fhandler_dev_raw::open (int flags, mode_t)
     flags = ((flags & ~O_WRONLY) | O_RDWR);
 
   int res = fhandler_base::open (flags, 0);
-  if (res && devbufsiz > 1L)
-    devbuf = new char [devbufsiz];
 
   return res;
 }
@@ -90,7 +96,12 @@ fhandler_dev_raw::dup (fhandler_base *child, int flags)
       fhandler_dev_raw *fhc = (fhandler_dev_raw *) child;
 
       if (devbufsiz > 1L)
-	fhc->devbuf = new char [devbufsiz];
+	{
+	  /* Create sector-aligned buffer */
+	  fhc->devbufalloc = new char [devbufsiz + devbufalign];
+	  fhc->devbuf = (char *) roundup2 ((uintptr_t) fhc->devbufalloc,
+					   devbufalign);
+	}
       fhc->devbufstart = 0;
       fhc->devbufend = 0;
       fhc->lastblk_to_read (false);
@@ -112,7 +123,11 @@ fhandler_dev_raw::fixup_after_exec ()
   if (!close_on_exec ())
     {
       if (devbufsiz > 1L)
-	devbuf = new char [devbufsiz];
+	{
+	  /* Create sector-aligned buffer */
+	  devbufalloc = new char [devbufsiz + devbufalign];
+	  devbuf = (char *) roundup2 ((uintptr_t) devbufalloc, devbufalign);
+	}
       devbufstart = 0;
       devbufend = 0;
       lastblk_to_read (false);
@@ -167,7 +182,7 @@ fhandler_dev_raw::ioctl (unsigned int cmd, void *buf)
 		  devbufend = 0;
 
 		if (devbufsiz > 1L)
-		  delete [] devbuf;
+		  delete [] devbufalloc;
 
 		devbufstart = 0;
 		devbuf = buf;