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NetBSD/sys/msdosfs/fat.h

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Deal correctly with boundary between 12 bit and 16 bit cluster numbers
1996-02-12 01:48:14 +03:00
/* $NetBSD: fat.h,v 1.10 1996/02/11 22:48:14 ws Exp $ */
New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'
1994-06-29 10:29:24 +04:00
finish updating to new vnode interface, from ws.
1994-07-19 01:38:08 +04:00
/*-
* Copyright (C) 1994 Wolfgang Solfrank.
* Copyright (C) 1994 TooLs GmbH.
* All rights reserved.
Fix bug with writing back modified directory entries
1994-08-21 22:43:49 +04:00
* Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
finish updating to new vnode interface, from ws.
1994-07-19 01:38:08 +04:00
*
* 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.
*/
brought in fixed/renamed/matching MS-DOS FS code, from Jeff Polk <polk@bsdi.com>. His notes are as follows: ------------------------------------------------------------------------------ July 22, 1993 - Changed name of entire package from PCFS to MSDOSFS - Fixed bugs: root directory size in clusters instead of bytes growing directory didn't update in-core size link, symlink, mknod didn't free locked parent (deadlock) lookup returned real error on create and rename instead of EJUSTRETURN rename changed `.' entry in child instead of name entry in parent rename removed `.' entry in child instead of removing entry in parent when moving a directory from one dir to another createde() left new node locked when write of parent failed (deadlock) removede() decremented refcount even on error (rmdir's which failed due to write errors left in-core cache entries inconsistent) changed validation for filesystem to not check for the boot signature since some disks (e.g., mtools) aren't bootable directories are always show current time as modify time (needed for NFS export since DOS never updates dir mod times -- ctime is true create time). - Added support for cookies changes to the readdir() vnode interface (#ifdef __bsdi__) - Punted on the whole problem of inode generation numbers. This means that there's a chance of using a stale file handle to access a new file, but it doesn't appear to be the common case, and I don't see how to generate reasonable generation numbers without changing something on the disk (which is the way the SVR4 filesystem survival kit guys did it). I don't think it would be very safe to change the on-disk format. Jeff Polk (polk@BSDI.COM) ------------------------------------------------------------------------------
1993-08-13 15:35:13 +04:00
/*
* 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 */
/*
Instead of using '#ifdef atari' to handle the differences of Gemdosfs and Msdosfs, use a flag that can be set by mount_msdos. This is definitely more flexible.
1996-01-19 17:28:05 +03:00
* MSDOSFS:
brought in fixed/renamed/matching MS-DOS FS code, from Jeff Polk <polk@bsdi.com>. His notes are as follows: ------------------------------------------------------------------------------ July 22, 1993 - Changed name of entire package from PCFS to MSDOSFS - Fixed bugs: root directory size in clusters instead of bytes growing directory didn't update in-core size link, symlink, mknod didn't free locked parent (deadlock) lookup returned real error on create and rename instead of EJUSTRETURN rename changed `.' entry in child instead of name entry in parent rename removed `.' entry in child instead of removing entry in parent when moving a directory from one dir to another createde() left new node locked when write of parent failed (deadlock) removede() decremented refcount even on error (rmdir's which failed due to write errors left in-core cache entries inconsistent) changed validation for filesystem to not check for the boot signature since some disks (e.g., mtools) aren't bootable directories are always show current time as modify time (needed for NFS export since DOS never updates dir mod times -- ctime is true create time). - Added support for cookies changes to the readdir() vnode interface (#ifdef __bsdi__) - Punted on the whole problem of inode generation numbers. This means that there's a chance of using a stale file handle to access a new file, but it doesn't appear to be the common case, and I don't see how to generate reasonable generation numbers without changing something on the disk (which is the way the SVR4 filesystem survival kit guys did it). I don't think it would be very safe to change the on-disk format. Jeff Polk (polk@BSDI.COM) ------------------------------------------------------------------------------
1993-08-13 15:35:13 +04:00
* Return true if filesystem uses 12 bit fats. Microsoft Programmer's
* Reference says if the maximum cluster number in a filesystem is greater
Deal correctly with boundary between 12 bit and 16 bit cluster numbers
1996-02-12 01:48:14 +03:00
* than 4078 ((CLUST_RSRVS - CLUST_FIRST) & FAT12_MASK) then we've got a
* 16 bit fat filesystem. While mounting, the result of this test is stored
* in pm_fatentrysize.
Instead of using '#ifdef atari' to handle the differences of Gemdosfs and Msdosfs, use a flag that can be set by mount_msdos. This is definitely more flexible.
1996-01-19 17:28:05 +03:00
* GEMDOS-flavour (atari):
* 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. Note that this kind of
* detection gets flakey when mounting a vnd-device.
brought in fixed/renamed/matching MS-DOS FS code, from Jeff Polk <polk@bsdi.com>. His notes are as follows: ------------------------------------------------------------------------------ July 22, 1993 - Changed name of entire package from PCFS to MSDOSFS - Fixed bugs: root directory size in clusters instead of bytes growing directory didn't update in-core size link, symlink, mknod didn't free locked parent (deadlock) lookup returned real error on create and rename instead of EJUSTRETURN rename changed `.' entry in child instead of name entry in parent rename removed `.' entry in child instead of removing entry in parent when moving a directory from one dir to another createde() left new node locked when write of parent failed (deadlock) removede() decremented refcount even on error (rmdir's which failed due to write errors left in-core cache entries inconsistent) changed validation for filesystem to not check for the boot signature since some disks (e.g., mtools) aren't bootable directories are always show current time as modify time (needed for NFS export since DOS never updates dir mod times -- ctime is true create time). - Added support for cookies changes to the readdir() vnode interface (#ifdef __bsdi__) - Punted on the whole problem of inode generation numbers. This means that there's a chance of using a stale file handle to access a new file, but it doesn't appear to be the common case, and I don't see how to generate reasonable generation numbers without changing something on the disk (which is the way the SVR4 filesystem survival kit guys did it). I don't think it would be very safe to change the on-disk format. Jeff Polk (polk@BSDI.COM) ------------------------------------------------------------------------------
1993-08-13 15:35:13 +04:00
*/
Instead of using '#ifdef atari' to handle the differences of Gemdosfs and Msdosfs, use a flag that can be set by mount_msdos. This is definitely more flexible.
1996-01-19 17:28:05 +03:00
#define FAT12(pmp) (pmp->pm_fatentrysize == 12)
#define FAT16(pmp) (pmp->pm_fatentrysize == 16)
brought in fixed/renamed/matching MS-DOS FS code, from Jeff Polk <polk@bsdi.com>. His notes are as follows: ------------------------------------------------------------------------------ July 22, 1993 - Changed name of entire package from PCFS to MSDOSFS - Fixed bugs: root directory size in clusters instead of bytes growing directory didn't update in-core size link, symlink, mknod didn't free locked parent (deadlock) lookup returned real error on create and rename instead of EJUSTRETURN rename changed `.' entry in child instead of name entry in parent rename removed `.' entry in child instead of removing entry in parent when moving a directory from one dir to another createde() left new node locked when write of parent failed (deadlock) removede() decremented refcount even on error (rmdir's which failed due to write errors left in-core cache entries inconsistent) changed validation for filesystem to not check for the boot signature since some disks (e.g., mtools) aren't bootable directories are always show current time as modify time (needed for NFS export since DOS never updates dir mod times -- ctime is true create time). - Added support for cookies changes to the readdir() vnode interface (#ifdef __bsdi__) - Punted on the whole problem of inode generation numbers. This means that there's a chance of using a stale file handle to access a new file, but it doesn't appear to be the common case, and I don't see how to generate reasonable generation numbers without changing something on the disk (which is the way the SVR4 filesystem survival kit guys did it). I don't think it would be very safe to change the on-disk format. Jeff Polk (polk@BSDI.COM) ------------------------------------------------------------------------------
1993-08-13 15:35:13 +04:00
#define MSDOSFSEOF(cn) (((cn) & 0xfff8) == 0xfff8)
KERNEL -> _KERNEL
1995-03-30 01:57:43 +04:00
#ifdef _KERNEL
brought in fixed/renamed/matching MS-DOS FS code, from Jeff Polk <polk@bsdi.com>. His notes are as follows: ------------------------------------------------------------------------------ July 22, 1993 - Changed name of entire package from PCFS to MSDOSFS - Fixed bugs: root directory size in clusters instead of bytes growing directory didn't update in-core size link, symlink, mknod didn't free locked parent (deadlock) lookup returned real error on create and rename instead of EJUSTRETURN rename changed `.' entry in child instead of name entry in parent rename removed `.' entry in child instead of removing entry in parent when moving a directory from one dir to another createde() left new node locked when write of parent failed (deadlock) removede() decremented refcount even on error (rmdir's which failed due to write errors left in-core cache entries inconsistent) changed validation for filesystem to not check for the boot signature since some disks (e.g., mtools) aren't bootable directories are always show current time as modify time (needed for NFS export since DOS never updates dir mod times -- ctime is true create time). - Added support for cookies changes to the readdir() vnode interface (#ifdef __bsdi__) - Punted on the whole problem of inode generation numbers. This means that there's a chance of using a stale file handle to access a new file, but it doesn't appear to be the common case, and I don't see how to generate reasonable generation numbers without changing something on the disk (which is the way the SVR4 filesystem survival kit guys did it). I don't think it would be very safe to change the on-disk format. Jeff Polk (polk@BSDI.COM) ------------------------------------------------------------------------------
1993-08-13 15:35:13 +04:00
/*
* 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)
finish updating to new vnode interface, from ws.
1994-07-19 01:38:08 +04:00
/*
* Flags to extendfile:
*/
#define DE_CLEAR 1 /* Zero out the blocks allocated */
Don't allow setattr on msdos directories (fixes pr kern/1436) Correct handling of rmdir'ing open directories Correct implementation of rename (includes renaming of directories) Handle root directories that are not multiple clusters in size
1995-09-09 23:38:00 +04:00
int pcbmap __P((struct denode *, u_long, daddr_t *, u_long *, int *));
Various changes: * Make some of the code look more like UFS. * Check permissions in lookup(). * Move the directory size special case into DE_EXTERNALIZE(). * Fix some conditions where lookup() might not release a buffer. * Remove bogus flag handling in setattr(). * Pass timespec, not timeval, to deupdat(). * Check more error conditions. * Fix possible panics in rename(). * Simplify readdir(). * General code cleanup; add prototypes, delete unused variables, etc.
1994-09-28 14:31:23 +03:00
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));
KERNEL -> _KERNEL
1995-03-30 01:57:43 +04:00
#endif /* _KERNEL */