277 lines
12 KiB
C
277 lines
12 KiB
C
/* $Id: denode.h,v 1.16 1998/05/17 18:00:42 bde Exp $ */
|
|
/* $NetBSD: denode.h,v 1.25 1997/11/17 15:36:28 ws Exp $ */
|
|
|
|
/*-
|
|
* Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
|
|
* Copyright (C) 1994, 1995, 1997 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
|
|
*/
|
|
|
|
/*
|
|
* This is the pc filesystem specific portion of the vnode structure.
|
|
*
|
|
* To describe a file uniquely the de_dirclust, de_diroffset, and
|
|
* de_StartCluster fields are used.
|
|
*
|
|
* de_dirclust contains the cluster number of the directory cluster
|
|
* containing the entry for a file or directory.
|
|
* de_diroffset is the index into the cluster for the entry describing
|
|
* a file or directory.
|
|
* de_StartCluster is the number of the first cluster of the file or directory.
|
|
*
|
|
* Now to describe the quirks of the pc filesystem.
|
|
* - Clusters 0 and 1 are reserved.
|
|
* - The first allocatable cluster is 2.
|
|
* - The root directory is of fixed size and all blocks that make it up
|
|
* are contiguous.
|
|
* - Cluster 0 refers to the root directory when it is found in the
|
|
* startcluster field of a directory entry that points to another directory.
|
|
* - Cluster 0 implies a 0 length file when found in the start cluster field
|
|
* of a directory entry that points to a file.
|
|
* - You can't use the cluster number 0 to derive the address of the root
|
|
* directory.
|
|
* - Multiple directory entries can point to a directory. The entry in the
|
|
* parent directory points to a child directory. Any directories in the
|
|
* child directory contain a ".." entry that points back to the parent.
|
|
* The child directory itself contains a "." entry that points to itself.
|
|
* - The root directory does not contain a "." or ".." entry.
|
|
* - Directory entries for directories are never changed once they are created
|
|
* (except when removed). The size stays 0, and the last modification time
|
|
* is never changed. This is because so many directory entries can point to
|
|
* the physical clusters that make up a directory. It would lead to an
|
|
* update nightmare.
|
|
* - The length field in a directory entry pointing to a directory contains 0
|
|
* (always). The only way to find the end of a directory is to follow the
|
|
* cluster chain until the "last cluster" marker is found.
|
|
*
|
|
* My extensions to make this house of cards work. These apply only to the in
|
|
* memory copy of the directory entry.
|
|
* - A reference count for each denode will be kept since dos doesn't keep such
|
|
* things.
|
|
*/
|
|
|
|
/*
|
|
* Internal pseudo-offset for (nonexistent) directory entry for the root
|
|
* dir in the root dir
|
|
*/
|
|
#define MSDOSFSROOT_OFS 0x1fffffff
|
|
|
|
/*
|
|
* The fat cache structure. fc_fsrcn is the filesystem relative cluster
|
|
* number that corresponds to the file relative cluster number in this
|
|
* structure (fc_frcn).
|
|
*/
|
|
struct fatcache {
|
|
u_long fc_frcn; /* file relative cluster number */
|
|
u_long fc_fsrcn; /* filesystem relative cluster number */
|
|
};
|
|
|
|
/*
|
|
* The fat entry cache as it stands helps make extending files a "quick"
|
|
* operation by avoiding having to scan the fat to discover the last
|
|
* cluster of the file. The cache also helps sequential reads by
|
|
* remembering the last cluster read from the file. This also prevents us
|
|
* from having to rescan the fat to find the next cluster to read. This
|
|
* cache is probably pretty worthless if a file is opened by multiple
|
|
* processes.
|
|
*/
|
|
#define FC_SIZE 2 /* number of entries in the cache */
|
|
#define FC_LASTMAP 0 /* entry the last call to pcbmap() resolved
|
|
* to */
|
|
#define FC_LASTFC 1 /* entry for the last cluster in the file */
|
|
|
|
#define FCE_EMPTY 0xffffffff /* doesn't represent an actual cluster # */
|
|
|
|
/*
|
|
* Set a slot in the fat cache.
|
|
*/
|
|
#define fc_setcache(dep, slot, frcn, fsrcn) \
|
|
(dep)->de_fc[slot].fc_frcn = frcn; \
|
|
(dep)->de_fc[slot].fc_fsrcn = fsrcn;
|
|
|
|
/*
|
|
* This is the in memory variant of a dos directory entry. It is usually
|
|
* contained within a vnode.
|
|
*/
|
|
struct denode {
|
|
struct lock de_lock; /* denode lock >Keep this first< */
|
|
struct denode *de_next; /* Hash chain forward */
|
|
struct denode **de_prev; /* Hash chain back */
|
|
struct vnode *de_vnode; /* addr of vnode we are part of */
|
|
struct vnode *de_devvp; /* vnode of blk dev we live on */
|
|
u_long de_flag; /* flag bits */
|
|
dev_t de_dev; /* device where direntry lives */
|
|
u_long de_dirclust; /* cluster of the directory file containing this entry */
|
|
u_long de_diroffset; /* offset of this entry in the directory cluster */
|
|
u_long de_fndoffset; /* offset of found dir entry */
|
|
int de_fndcnt; /* number of slots before de_fndoffset */
|
|
long de_refcnt; /* reference count */
|
|
struct msdosfsmount *de_pmp; /* addr of our mount struct */
|
|
u_char de_Name[12]; /* name, from DOS directory entry */
|
|
u_char de_Attributes; /* attributes, from directory entry */
|
|
u_char de_LowerCase; /* NT VFAT lower case flags */
|
|
u_char de_CHun; /* Hundredth of second of CTime*/
|
|
u_short de_CTime; /* creation time */
|
|
u_short de_CDate; /* creation date */
|
|
u_short de_ADate; /* access date */
|
|
u_short de_MTime; /* modification time */
|
|
u_short de_MDate; /* modification date */
|
|
u_long de_StartCluster; /* starting cluster of file */
|
|
u_long de_FileSize; /* size of file in bytes */
|
|
struct fatcache de_fc[FC_SIZE]; /* fat cache */
|
|
u_quad_t de_modrev; /* Revision level for lease. */
|
|
};
|
|
|
|
/*
|
|
* Values for the de_flag field of the denode.
|
|
*/
|
|
#define DE_UPDATE 0x0004 /* Modification time update request */
|
|
#define DE_CREATE 0x0008 /* Creation time update */
|
|
#define DE_ACCESS 0x0010 /* Access time update */
|
|
#define DE_MODIFIED 0x0020 /* Denode has been modified */
|
|
#define DE_RENAME 0x0040 /* Denode is in the process of being renamed */
|
|
|
|
|
|
/*
|
|
* Transfer directory entries between internal and external form.
|
|
* dep is a struct denode * (internal form),
|
|
* dp is a struct direntry * (external form).
|
|
*/
|
|
#define DE_INTERNALIZE32(dep, dp) \
|
|
((dep)->de_StartCluster |= getushort((dp)->deHighClust) << 16)
|
|
#define DE_INTERNALIZE(dep, dp) \
|
|
(bcopy((dp)->deName, (dep)->de_Name, 11), \
|
|
(dep)->de_Attributes = (dp)->deAttributes, \
|
|
(dep)->de_LowerCase = (dp)->deLowerCase, \
|
|
(dep)->de_CHun = (dp)->deCHundredth, \
|
|
(dep)->de_CTime = getushort((dp)->deCTime), \
|
|
(dep)->de_CDate = getushort((dp)->deCDate), \
|
|
(dep)->de_ADate = getushort((dp)->deADate), \
|
|
(dep)->de_MTime = getushort((dp)->deMTime), \
|
|
(dep)->de_MDate = getushort((dp)->deMDate), \
|
|
(dep)->de_StartCluster = getushort((dp)->deStartCluster), \
|
|
(dep)->de_FileSize = getulong((dp)->deFileSize), \
|
|
(FAT32((dep)->de_pmp) ? DE_INTERNALIZE32((dep), (dp)) : 0))
|
|
|
|
#define DE_EXTERNALIZE32(dp, dep) \
|
|
putushort((dp)->deHighClust, (dep)->de_StartCluster >> 16)
|
|
#define DE_EXTERNALIZE(dp, dep) \
|
|
(bcopy((dep)->de_Name, (dp)->deName, 11), \
|
|
(dp)->deAttributes = (dep)->de_Attributes, \
|
|
(dp)->deLowerCase = (dep)->de_LowerCase, \
|
|
(dp)->deCHundredth = (dep)->de_CHun, \
|
|
putushort((dp)->deCTime, (dep)->de_CTime), \
|
|
putushort((dp)->deCDate, (dep)->de_CDate), \
|
|
putushort((dp)->deADate, (dep)->de_ADate), \
|
|
putushort((dp)->deMTime, (dep)->de_MTime), \
|
|
putushort((dp)->deMDate, (dep)->de_MDate), \
|
|
putushort((dp)->deStartCluster, (dep)->de_StartCluster), \
|
|
putulong((dp)->deFileSize, \
|
|
((dep)->de_Attributes & ATTR_DIRECTORY) ? 0 : (dep)->de_FileSize), \
|
|
(FAT32((dep)->de_pmp) ? DE_EXTERNALIZE32((dp), (dep)) : 0))
|
|
|
|
#define de_forw de_chain[0]
|
|
#define de_back de_chain[1]
|
|
|
|
#ifdef KERNEL
|
|
|
|
#define VTODE(vp) ((struct denode *)(vp)->v_data)
|
|
#define DETOV(de) ((de)->de_vnode)
|
|
|
|
#define DETIMES(dep, acc, mod, cre) \
|
|
if ((dep)->de_flag & (DE_UPDATE | DE_CREATE | DE_ACCESS)) { \
|
|
(dep)->de_flag |= DE_MODIFIED; \
|
|
if ((dep)->de_flag & DE_UPDATE) { \
|
|
unix2dostime((mod), &(dep)->de_MDate, &(dep)->de_MTime, NULL); \
|
|
(dep)->de_Attributes |= ATTR_ARCHIVE; \
|
|
} \
|
|
if (!((dep)->de_pmp->pm_flags & MSDOSFSMNT_NOWIN95)) { \
|
|
if ((dep)->de_flag & DE_ACCESS) \
|
|
unix2dostime((acc), &(dep)->de_ADate, NULL, NULL); \
|
|
if ((dep)->de_flag & DE_CREATE) \
|
|
unix2dostime((cre), &(dep)->de_CDate, &(dep)->de_CTime, &(dep)->de_CHun); \
|
|
} \
|
|
(dep)->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS); \
|
|
}
|
|
|
|
/*
|
|
* This overlays the fid structure (see mount.h)
|
|
*/
|
|
struct defid {
|
|
u_short defid_len; /* length of structure */
|
|
u_short defid_pad; /* force long alignment */
|
|
|
|
u_long defid_dirclust; /* cluster this dir entry came from */
|
|
u_long defid_dirofs; /* offset of entry within the cluster */
|
|
#if 0
|
|
u_long defid_gen; /* generation number */
|
|
#endif
|
|
};
|
|
|
|
extern vop_t **msdosfs_vnodeop_p;
|
|
|
|
int msdosfs_lookup __P((struct vop_cachedlookup_args *));
|
|
int msdosfs_inactive __P((struct vop_inactive_args *));
|
|
int msdosfs_reclaim __P((struct vop_reclaim_args *));
|
|
|
|
/*
|
|
* Internal service routine prototypes.
|
|
*/
|
|
int deget __P((struct msdosfsmount *, u_long, u_long, struct denode **));
|
|
int uniqdosname __P((struct denode *, struct componentname *, u_char *));
|
|
int findwin95 __P((struct denode *));
|
|
|
|
int readep __P((struct msdosfsmount *pmp, u_long dirclu, u_long dirofs, struct buf **bpp, struct direntry **epp));
|
|
int readde __P((struct denode *dep, struct buf **bpp, struct direntry **epp));
|
|
int deextend __P((struct denode *dep, u_long length, struct ucred *cred));
|
|
int fillinusemap __P((struct msdosfsmount *pmp));
|
|
void reinsert __P((struct denode *dep));
|
|
int dosdirempty __P((struct denode *dep));
|
|
int createde __P((struct denode *dep, struct denode *ddep, struct denode **depp, struct componentname *cnp));
|
|
int deupdat __P((struct denode *dep, int waitfor));
|
|
int removede __P((struct denode *pdep, struct denode *dep));
|
|
int detrunc __P((struct denode *dep, u_long length, int flags, struct ucred *cred, struct proc *p));
|
|
int doscheckpath __P(( struct denode *source, struct denode *target));
|
|
#endif /* KERNEL */
|