274 lines
11 KiB
C
274 lines
11 KiB
C
/* $Id: denode.h,v 1.5 1995/05/30 08:07:32 rgrimes Exp $ */
|
|
/* $NetBSD: denode.h,v 1.8 1994/08/21 18:43:49 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
|
|
*/
|
|
|
|
/*
|
|
* 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; /* ordinal of this entry in the directory */
|
|
u_long de_fndclust; /* cluster of found dir entry */
|
|
u_long de_fndoffset; /* offset of found dir entry */
|
|
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 */
|
|
/* the next two fields must be contiguous in memory... */
|
|
u_char de_Name[8]; /* name, from directory entry */
|
|
u_char de_Extension[3]; /* extension, from directory entry */
|
|
u_char de_Attributes; /* attributes, from directory entry */
|
|
u_short de_Time; /* creation time */
|
|
u_short de_Date; /* creation 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 */
|
|
u_quad_t de_modrev; /* Revision level for lease. */
|
|
};
|
|
|
|
/*
|
|
* Values for the de_flag field of the denode.
|
|
*/
|
|
#define DE_LOCKED 0x0001 /* directory entry is locked */
|
|
#define DE_WANTED 0x0002 /* someone wants this de */
|
|
#define DE_UPDATE 0x0004 /* modification time update request */
|
|
#define DE_MODIFIED 0x0080 /* denode has been modified, but DE_UPDATE
|
|
* isn't set */
|
|
|
|
/*
|
|
* 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_Time = getushort((dp)->deTime), \
|
|
(dep)->de_Date = getushort((dp)->deDate), \
|
|
(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)->deTime, (dep)->de_Time), \
|
|
putushort((dp)->deDate, (dep)->de_Date), \
|
|
putushort((dp)->deStartCluster, (dep)->de_StartCluster), \
|
|
putulong((dp)->deFileSize, (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 DE_TIMES(dep, t) \
|
|
if ((dep)->de_flag & DE_UPDATE) { \
|
|
if (!((dep)->de_Attributes & ATTR_DIRECTORY)) { \
|
|
struct timespec DE_TIMES_ts; \
|
|
(dep)->de_flag |= DE_MODIFIED; \
|
|
TIMEVAL_TO_TIMESPEC((t), &DE_TIMES_ts); \
|
|
unix2dostime(&DE_TIMES_ts, &(dep)->de_Date, \
|
|
&(dep)->de_Time); \
|
|
(dep)->de_Attributes |= ATTR_ARCHIVE; \
|
|
} \
|
|
(dep)->de_flag &= ~DE_UPDATE; \
|
|
}
|
|
|
|
/*
|
|
* 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; /* index of entry within the cluster */
|
|
|
|
/* u_long defid_gen; generation number */
|
|
};
|
|
|
|
extern int (**msdosfs_vnodeop_p)();
|
|
|
|
/*
|
|
* Prototypes for MSDOSFS vnode operations
|
|
*/
|
|
int msdosfs_lookup __P((struct vop_lookup_args *));
|
|
int msdosfs_create __P((struct vop_create_args *));
|
|
int msdosfs_mknod __P((struct vop_mknod_args *));
|
|
int msdosfs_open __P((struct vop_open_args *));
|
|
int msdosfs_close __P((struct vop_close_args *));
|
|
int msdosfs_access __P((struct vop_access_args *));
|
|
int msdosfs_getattr __P((struct vop_getattr_args *));
|
|
int msdosfs_setattr __P((struct vop_setattr_args *));
|
|
int msdosfs_read __P((struct vop_read_args *));
|
|
int msdosfs_write __P((struct vop_write_args *));
|
|
int msdosfs_ioctl __P((struct vop_ioctl_args *));
|
|
int msdosfs_select __P((struct vop_select_args *));
|
|
int msdosfs_mmap __P((struct vop_mmap_args *));
|
|
int msdosfs_fsync __P((struct vop_fsync_args *));
|
|
int msdosfs_seek __P((struct vop_seek_args *));
|
|
int msdosfs_remove __P((struct vop_remove_args *));
|
|
int msdosfs_link __P((struct vop_link_args *));
|
|
int msdosfs_rename __P((struct vop_rename_args *));
|
|
int msdosfs_mkdir __P((struct vop_mkdir_args *));
|
|
int msdosfs_rmdir __P((struct vop_rmdir_args *));
|
|
int msdosfs_symlink __P((struct vop_symlink_args *));
|
|
int msdosfs_readdir __P((struct vop_readdir_args *));
|
|
int msdosfs_readlink __P((struct vop_readlink_args *));
|
|
int msdosfs_abortop __P((struct vop_abortop_args *));
|
|
int msdosfs_inactive __P((struct vop_inactive_args *));
|
|
int msdosfs_reclaim __P((struct vop_reclaim_args *));
|
|
int msdosfs_lock __P((struct vop_lock_args *));
|
|
int msdosfs_unlock __P((struct vop_unlock_args *));
|
|
int msdosfs_bmap __P((struct vop_bmap_args *));
|
|
int msdosfs_strategy __P((struct vop_strategy_args *));
|
|
int msdosfs_print __P((struct vop_print_args *));
|
|
int msdosfs_islocked __P((struct vop_islocked_args *));
|
|
int msdosfs_advlock __P((struct vop_advlock_args *));
|
|
int msdosfs_reallocblks __P((struct vop_reallocblks_args *));
|
|
|
|
/*
|
|
* Internal service routine prototypes.
|
|
*/
|
|
int deget __P((struct msdosfsmount * pmp, u_long dirclust, u_long diroffset, struct direntry * direntptr, struct denode ** depp));
|
|
#endif /* KERNEL */
|