initial import of NetBSD tree

1 files changed, 111 insertions, 0 deletions

diff --git a/sys/msdosfs/fat.h b/sys/msdosfs/fat.h
new file mode 100644
index 00000000000..89c66757ef8
--- /dev/null
+++ b/sys/msdosfs/fat.h
@@ -0,0 +1,111 @@
+/*	$NetBSD: fat.h,v 1.8 1995/09/09 19:38:01 ws Exp $	*/
+
+/*-
+ * Copyright (C) 1994 Wolfgang Solfrank.
+ * Copyright (C) 1994 TooLs GmbH.
+ * All rights reserved.
+ * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by TooLs GmbH.
+ * 4. The name of TooLs GmbH may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+/*
+ * Written by Paul Popelka (paulp@uts.amdahl.com)
+ * 
+ * You can do anything you want with this software, just don't say you wrote
+ * it, and don't remove this notice.
+ * 
+ * This software is provided "as is".
+ * 
+ * The author supplies this software to be publicly redistributed on the
+ * understanding that the author is not responsible for the correct
+ * functioning of this software in any circumstances and is not liable for
+ * any damages caused by this software.
+ * 
+ * October 1992
+ */
+
+/*
+ * Some useful cluster numbers.
+ */
+#define	MSDOSFSROOT	0	/* cluster 0 means the root dir */
+#define	CLUST_FREE	0	/* cluster 0 also means a free cluster */
+#define	MSDOSFSFREE	CLUST_FREE
+#define	CLUST_FIRST	2	/* first legal cluster number */
+#define	CLUST_RSRVS	0xfff0	/* start of reserved cluster range */
+#define	CLUST_RSRVE	0xfff6	/* end of reserved cluster range */
+#define	CLUST_BAD	0xfff7	/* a cluster with a defect */
+#define	CLUST_EOFS	0xfff8	/* start of eof cluster range */
+#define	CLUST_EOFE	0xffff	/* end of eof cluster range */
+
+#define	FAT12_MASK	0x0fff	/* mask for 12 bit cluster numbers */
+#define	FAT16_MASK	0xffff	/* mask for 16 bit cluster numbers */
+
+#ifdef	atari
+/*
+ * Return true if filesystem uses 12 bit fats. If the filesystem
+ * is on floppy we've got a 12 bit fat filesystem, otherwise 16 bit.
+ * We check the d_type field in the disklabel struct while mounting
+ * and store the result in the pm_fatentrysize field in the
+ * msdosfsmount struct.
+ */
+#define	FAT12(pmp)	(pmp->pm_fatentrysize == 12)
+#define	FAT16(pmp)	(pmp->pm_fatentrysize == 16)
+#else	/* !atari */
+/*
+ * Return true if filesystem uses 12 bit fats. Microsoft Programmer's
+ * Reference says if the maximum cluster number in a filesystem is greater
+ * than 4086 then we've got a 16 bit fat filesystem.
+ */
+#define	FAT12(pmp)	(pmp->pm_maxcluster <= 4086)
+#define	FAT16(pmp)	(pmp->pm_maxcluster >  4086)
+#endif	/* !atari */
+
+#define	MSDOSFSEOF(cn)	(((cn) & 0xfff8) == 0xfff8)
+
+#ifdef _KERNEL
+/*
+ * These are the values for the function argument to the function
+ * fatentry().
+ */
+#define	FAT_GET		0x0001	/* get a fat entry */
+#define	FAT_SET		0x0002	/* set a fat entry */
+#define	FAT_GET_AND_SET	(FAT_GET | FAT_SET)
+
+/*
+ * Flags to extendfile:
+ */
+#define	DE_CLEAR	1	/* Zero out the blocks allocated */
+
+int pcbmap __P((struct denode *, u_long, daddr_t *, u_long *, int *));
+int clusterfree __P((struct msdosfsmount *, u_long, u_long *));
+int clusteralloc __P((struct msdosfsmount *, u_long, u_long, u_long, u_long *, u_long *));
+int extendfile __P((struct denode *, u_long, struct buf **, u_long *, int));
+int fatentry __P((int, struct msdosfsmount *, u_long, u_long *, u_long));
+void fc_purge __P((struct denode *, u_int));
+void fc_lookup __P((struct denode *, u_long, u_long *, u_long *));
+int fillinusemap __P((struct msdosfsmount *));
+int freeclusterchain __P((struct msdosfsmount *, u_long));
+#endif	/* _KERNEL */