f57e65478d
it 1138 times (:-() in casts and a few more times in declarations. This change is null for the i386. The type has to be `typedef int vop_t(void *)' and not `typedef int vop_t()' because `gcc -Wstrict-prototypes' warns about the latter. Since vnode op functions are called with args of different (struct pointer) types, neither of these function types is any use for type checking of the arg, so it would be preferable not to use the complete function type, especially since using the complete type requires adding 1138 casts to avoid compiler warnings and another 40+ casts to reverse the function pointer conversions before calling the functions.
240 lines
9.5 KiB
C
240 lines
9.5 KiB
C
/* $Id: denode.h,v 1.7 1995/10/29 15:31:43 phk Exp $ */
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/* $NetBSD: denode.h,v 1.8 1994/08/21 18:43:49 ws Exp $ */
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/*-
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* Copyright (C) 1994 Wolfgang Solfrank.
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* Copyright (C) 1994 TooLs GmbH.
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* All rights reserved.
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* Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Written by Paul Popelka (paulp@uts.amdahl.com)
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*
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* You can do anything you want with this software, just don't say you wrote
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* it, and don't remove this notice.
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*
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* This software is provided "as is".
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*
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* The author supplies this software to be publicly redistributed on the
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* understanding that the author is not responsible for the correct
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* functioning of this software in any circumstances and is not liable for
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* any damages caused by this software.
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*
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* October 1992
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*/
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/*
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* This is the pc filesystem specific portion of the vnode structure.
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*
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* To describe a file uniquely the de_dirclust, de_diroffset, and
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* de_StartCluster fields are used.
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*
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* de_dirclust contains the cluster number of the directory cluster
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* containing the entry for a file or directory.
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* de_diroffset is the index into the cluster for the entry describing
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* a file or directory.
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* de_StartCluster is the number of the first cluster of the file or directory.
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*
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* Now to describe the quirks of the pc filesystem.
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* - Clusters 0 and 1 are reserved.
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* - The first allocatable cluster is 2.
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* - The root directory is of fixed size and all blocks that make it up
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* are contiguous.
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* - Cluster 0 refers to the root directory when it is found in the
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* startcluster field of a directory entry that points to another directory.
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* - Cluster 0 implies a 0 length file when found in the start cluster field
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* of a directory entry that points to a file.
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* - You can't use the cluster number 0 to derive the address of the root
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* directory.
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* - Multiple directory entries can point to a directory. The entry in the
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* parent directory points to a child directory. Any directories in the
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* child directory contain a ".." entry that points back to the parent.
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* The child directory itself contains a "." entry that points to itself.
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* - The root directory does not contain a "." or ".." entry.
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* - Directory entries for directories are never changed once they are created
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* (except when removed). The size stays 0, and the last modification time
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* is never changed. This is because so many directory entries can point to
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* the physical clusters that make up a directory. It would lead to an
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* update nightmare.
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* - The length field in a directory entry pointing to a directory contains 0
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* (always). The only way to find the end of a directory is to follow the
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* cluster chain until the "last cluster" marker is found.
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*
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* My extensions to make this house of cards work. These apply only to the in
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* memory copy of the directory entry.
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* - A reference count for each denode will be kept since dos doesn't keep such
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* things.
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*/
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/*
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* Internal pseudo-offset for (nonexistent) directory entry for the root
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* dir in the root dir
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*/
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#define MSDOSFSROOT_OFS 0x1fffffff
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/*
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* The fat cache structure. fc_fsrcn is the filesystem relative cluster
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* number that corresponds to the file relative cluster number in this
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* structure (fc_frcn).
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*/
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struct fatcache {
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u_short fc_frcn; /* file relative cluster number */
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u_short fc_fsrcn; /* filesystem relative cluster number */
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};
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/*
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* The fat entry cache as it stands helps make extending files a "quick"
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* operation by avoiding having to scan the fat to discover the last
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* cluster of the file. The cache also helps sequential reads by
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* remembering the last cluster read from the file. This also prevents us
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* from having to rescan the fat to find the next cluster to read. This
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* cache is probably pretty worthless if a file is opened by multiple
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* processes.
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*/
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#define FC_SIZE 2 /* number of entries in the cache */
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#define FC_LASTMAP 0 /* entry the last call to pcbmap() resolved
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* to */
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#define FC_LASTFC 1 /* entry for the last cluster in the file */
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#define FCE_EMPTY 0xffff /* doesn't represent an actual cluster # */
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/*
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* Set a slot in the fat cache.
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*/
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#define fc_setcache(dep, slot, frcn, fsrcn) \
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(dep)->de_fc[slot].fc_frcn = frcn; \
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(dep)->de_fc[slot].fc_fsrcn = fsrcn;
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/*
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* This is the in memory variant of a dos directory entry. It is usually
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* contained within a vnode.
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*/
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struct denode {
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struct denode *de_next; /* Hash chain forward */
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struct denode **de_prev; /* Hash chain back */
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struct vnode *de_vnode; /* addr of vnode we are part of */
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struct vnode *de_devvp; /* vnode of blk dev we live on */
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u_long de_flag; /* flag bits */
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dev_t de_dev; /* device where direntry lives */
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u_long de_dirclust; /* cluster of the directory file containing this entry */
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u_long de_diroffset; /* ordinal of this entry in the directory */
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u_long de_fndclust; /* cluster of found dir entry */
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u_long de_fndoffset; /* offset of found dir entry */
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long de_refcnt; /* reference count */
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struct msdosfsmount *de_pmp; /* addr of our mount struct */
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struct lockf *de_lockf; /* byte level lock list */
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pid_t de_lockholder; /* current lock holder */
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pid_t de_lockwaiter; /* lock wanter */
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/* the next two fields must be contiguous in memory... */
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u_char de_Name[8]; /* name, from directory entry */
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u_char de_Extension[3]; /* extension, from directory entry */
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u_char de_Attributes; /* attributes, from directory entry */
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u_short de_Time; /* creation time */
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u_short de_Date; /* creation date */
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u_short de_StartCluster; /* starting cluster of file */
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u_long de_FileSize; /* size of file in bytes */
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struct fatcache de_fc[FC_SIZE]; /* fat cache */
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u_quad_t de_modrev; /* Revision level for lease. */
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};
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/*
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* Values for the de_flag field of the denode.
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*/
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#define DE_LOCKED 0x0001 /* directory entry is locked */
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#define DE_WANTED 0x0002 /* someone wants this de */
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#define DE_UPDATE 0x0004 /* modification time update request */
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#define DE_MODIFIED 0x0080 /* denode has been modified, but DE_UPDATE
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* isn't set */
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/*
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* Transfer directory entries between internal and external form.
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* dep is a struct denode * (internal form),
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* dp is a struct direntry * (external form).
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*/
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#define DE_INTERNALIZE(dep, dp) \
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(bcopy((dp)->deName, (dep)->de_Name, 11), \
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(dep)->de_Attributes = (dp)->deAttributes, \
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(dep)->de_Time = getushort((dp)->deTime), \
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(dep)->de_Date = getushort((dp)->deDate), \
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(dep)->de_StartCluster = getushort((dp)->deStartCluster), \
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(dep)->de_FileSize = getulong((dp)->deFileSize))
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#define DE_EXTERNALIZE(dp, dep) \
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(bcopy((dep)->de_Name, (dp)->deName, 11), \
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(dp)->deAttributes = (dep)->de_Attributes, \
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putushort((dp)->deTime, (dep)->de_Time), \
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putushort((dp)->deDate, (dep)->de_Date), \
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putushort((dp)->deStartCluster, (dep)->de_StartCluster), \
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putulong((dp)->deFileSize, (dep)->de_FileSize))
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#define de_forw de_chain[0]
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#define de_back de_chain[1]
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#ifdef KERNEL
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#define VTODE(vp) ((struct denode *)(vp)->v_data)
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#define DETOV(de) ((de)->de_vnode)
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#define DE_TIMES(dep, t) \
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if ((dep)->de_flag & DE_UPDATE) { \
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if (!((dep)->de_Attributes & ATTR_DIRECTORY)) { \
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struct timespec DE_TIMES_ts; \
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(dep)->de_flag |= DE_MODIFIED; \
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TIMEVAL_TO_TIMESPEC((t), &DE_TIMES_ts); \
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unix2dostime(&DE_TIMES_ts, &(dep)->de_Date, \
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&(dep)->de_Time); \
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(dep)->de_Attributes |= ATTR_ARCHIVE; \
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} \
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(dep)->de_flag &= ~DE_UPDATE; \
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}
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/*
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* This overlays the fid structure (see mount.h)
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*/
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struct defid {
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u_short defid_len; /* length of structure */
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u_short defid_pad; /* force long alignment */
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u_long defid_dirclust; /* cluster this dir entry came from */
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u_long defid_dirofs; /* index of entry within the cluster */
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/* u_long defid_gen; generation number */
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};
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extern vop_t **msdosfs_vnodeop_p;
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int msdosfs_lookup __P((struct vop_lookup_args *));
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int msdosfs_inactive __P((struct vop_inactive_args *));
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int msdosfs_reclaim __P((struct vop_reclaim_args *));
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/*
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* Internal service routine prototypes.
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*/
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int deget __P((struct msdosfsmount * pmp, u_long dirclust, u_long diroffset, struct direntry * direntptr, struct denode ** depp));
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#endif /* KERNEL */
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