Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/sys/msdosfs/denode.h

313 lines
12 KiB
C
Raw Blame History

/* $NetBSD: denode.h,v 1.22 1996/09/07 12:41:22 mycroft Exp $ */
/*-
* Copyright (C) 1994, 1995 Wolfgang Solfrank.
* Copyright (C) 1994, 1995 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_short fc_frcn; /* file relative cluster number */
u_short 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 0xffff /* 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 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 */
struct lockf *de_lockf; /* byte level lock list */
pid_t de_lockholder; /* current lock holder */
pid_t de_lockwaiter; /* lock wanter */
u_char de_Name[12]; /* name, from DOS directory entry */
u_char de_Attributes; /* attributes, from directory entry */
u_short de_CTime; /* creation time */
u_short de_CDate; /* creation date */
u_short de_ADate; /* access date */
u_short de_ATime; /* access time */
u_short de_MTime; /* modification time */
u_short de_MDate; /* modification date */
u_short de_StartCluster; /* starting cluster of file */
u_long de_FileSize; /* size of file in bytes */
struct fatcache de_fc[FC_SIZE]; /* fat cache */
};
/*
* Values for the de_flag field of the denode.
*/
#define DE_LOCKED 0x0001 /* Denode lock. */
#define DE_WANTED 0x0002 /* Denode is wanted by a process. */
#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 */
/*
* Maximum filename length in Win95
* Note: Must be < sizeof(dirent.d_name)
*/
#define WIN_MAXLEN 255
/*
* Transfer directory entries between internal and external form.
* dep is a struct denode * (internal form),
* dp is a struct direntry * (external form).
*/
#define DE_INTERNALIZE(dep, dp) \
(bcopy((dp)->deName, (dep)->de_Name, 11), \
(dep)->de_Attributes = (dp)->deAttributes, \
(dep)->de_CTime = getushort((dp)->deCTime), \
(dep)->de_CDate = getushort((dp)->deCDate), \
(dep)->de_ATime = getushort((dp)->deATime), \
(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))
#define DE_EXTERNALIZE(dp, dep) \
(bcopy((dep)->de_Name, (dp)->deName, 11), \
(dp)->deAttributes = (dep)->de_Attributes, \
putushort((dp)->deCTime, (dep)->de_CTime), \
putushort((dp)->deCDate, (dep)->de_CDate), \
putushort((dp)->deATime, (dep)->de_ATime), \
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))
#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); \
(dep)->de_Attributes |= ATTR_ARCHIVE; \
} \
if (!((dep)->de_pmp->pm_flags & MSDOSFSMNT_NOWIN95)) { \
if ((dep)->de_flag & DE_ACCESS) \
unix2dostime((acc), &(dep)->de_ADate, &(dep)->de_ATime); \
if ((dep)->de_flag & DE_CREATE) \
unix2dostime((cre), &(dep)->de_CDate, &(dep)->de_CTime); \
} \
(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
};
/*
* Prototypes for MSDOSFS vnode operations
*/
int msdosfs_lookup __P((void *));
int msdosfs_create __P((void *));
int msdosfs_mknod __P((void *));
int msdosfs_open __P((void *));
int msdosfs_close __P((void *));
int msdosfs_access __P((void *));
int msdosfs_getattr __P((void *));
int msdosfs_setattr __P((void *));
int msdosfs_read __P((void *));
int msdosfs_write __P((void *));
#ifdef NFSSERVER
int lease_check __P((void *));
#define msdosfs_lease_check lease_check
#else
#define msdosfs_lease_check genfs_nullop
#endif
int msdosfs_ioctl __P((void *));
#define msdosfs_poll genfs_poll
int msdosfs_mmap __P((void *));
#define msdosfs_fsync genfs_fsync
#define msdosfs_seek genfs_nullop
int msdosfs_remove __P((void *));
int msdosfs_link __P((void *));
int msdosfs_rename __P((void *));
int msdosfs_mkdir __P((void *));
int msdosfs_rmdir __P((void *));
int msdosfs_symlink __P((void *));
int msdosfs_readdir __P((void *));
int msdosfs_readlink __P((void *));
#define msdosfs_abortop genfs_abortop
int msdosfs_inactive __P((void *));
int msdosfs_reclaim __P((void *));
int msdosfs_lock __P((void *));
int msdosfs_unlock __P((void *));
int msdosfs_bmap __P((void *));
int msdosfs_strategy __P((void *));
int msdosfs_print __P((void *));
int msdosfs_islocked __P((void *));
int msdosfs_advlock __P((void *));
int msdosfs_reallocblks __P((void *));
int msdosfs_pathconf __P((void *));
int msdosfs_update __P((void *));
/*
* Internal service routine prototypes.
*/
int createde __P((struct denode *, struct denode *, struct denode **, struct componentname *));
int deextend __P((struct denode *, u_long, struct ucred *));
int deget __P((struct msdosfsmount *, u_long, u_long, struct denode **));
int detrunc __P((struct denode *, u_long, int, struct ucred *, struct proc *));
int deupdat __P((struct denode *, int));
int doscheckpath __P((struct denode *, struct denode *));
int dosdirempty __P((struct denode *));
int readde __P((struct denode *, struct buf **, struct direntry **));
int readep __P((struct msdosfsmount *, u_long, u_long, struct buf **, struct direntry **));
void reinsert __P((struct denode *));
int removede __P((struct denode *, struct denode *));
int uniqdosname __P((struct denode *, struct componentname *, u_char *));
int findwin95 __P((struct denode *));
#endif /* _KERNEL */
Reference in New Issue View Git Blame Copy Permalink