fddfc9d5bb
This unifies several times in theory indentical 50 lines of code. The filesystems have a new method: vop_cachedlookup, which is the meat of the lookup, and use vfs_cache_lookup() for their vop_lookup method. vfs_cache_lookup() will check the namecache and pass on to the vop_cachedlookup method in case of a miss. It's still the task of the individual filesystems to populate the namecache with cache_enter(). Filesystems that do not use the namecache will just provide the vop_lookup method as usual.
238 lines
9.4 KiB
C
238 lines
9.4 KiB
C
/* $Id: denode.h,v 1.12 1997/02/26 14:23:09 bde 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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struct lock de_lock; /* denode lock */
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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_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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bzero((dp)->deReserved, 10), \
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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_cachedlookup_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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