freebsd-dev/sys/msdosfs/msdosfs_denode.c

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/* $Id: msdosfs_denode.c,v 1.15 1995/12/07 12:47:19 davidg Exp $ */
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/* $NetBSD: msdosfs_denode.c,v 1.9 1994/08/21 18:44:00 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)
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*
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* You can do anything you want with this software, just don't say you wrote
* 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
* 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.
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*
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* October 1992
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mount.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/vnode.h>
#include <sys/types.h>
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#include <sys/kernel.h> /* defines "time" */
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_extern.h>
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#include <msdosfs/bpb.h>
#include <msdosfs/msdosfsmount.h>
#include <msdosfs/direntry.h>
#include <msdosfs/denode.h>
#include <msdosfs/fat.h>
struct denode **dehashtbl;
u_long dehash; /* size of hash table - 1 */
#define DEHASH(dev, deno) (((dev) + (deno)) & dehash)
union _qcvt {
quad_t qcvt;
long val[2];
};
#define SETHIGH(q, h) { \
union _qcvt tmp; \
tmp.qcvt = (q); \
tmp.val[_QUAD_HIGHWORD] = (h); \
(q) = tmp.qcvt; \
}
#define SETLOW(q, l) { \
union _qcvt tmp; \
tmp.qcvt = (q); \
tmp.val[_QUAD_LOWWORD] = (l); \
(q) = tmp.qcvt; \
}
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static struct denode *
msdosfs_hashget __P((dev_t dev, u_long dirclust,
u_long diroff));
static void msdosfs_hashins __P((struct denode *dep));
static void msdosfs_hashrem __P((struct denode *dep));
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int msdosfs_init()
{
dehashtbl = hashinit(desiredvnodes/2, M_MSDOSFSMNT, &dehash);
return 0;
}
static struct denode *
msdosfs_hashget(dev, dirclust, diroff)
dev_t dev;
u_long dirclust;
u_long diroff;
{
struct denode *dep;
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for (;;)
for (dep = dehashtbl[DEHASH(dev, dirclust + diroff)];;
dep = dep->de_next) {
if (dep == NULL)
return NULL;
if (dirclust != dep->de_dirclust
|| diroff != dep->de_diroffset
|| dev != dep->de_dev
|| dep->de_refcnt == 0)
continue;
if (dep->de_flag & DE_LOCKED) {
dep->de_flag |= DE_WANTED;
(void) tsleep((caddr_t)dep, PINOD, "msdhgt", 0);
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break;
}
if (!vget(DETOV(dep), 1))
return dep;
break;
}
/* NOTREACHED */
}
static void
msdosfs_hashins(dep)
struct denode *dep;
{
struct denode **depp, *deq;
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depp = &dehashtbl[DEHASH(dep->de_dev, dep->de_dirclust + dep->de_diroffset)];
deq = *depp;
if (deq)
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deq->de_prev = &dep->de_next;
dep->de_next = deq;
dep->de_prev = depp;
*depp = dep;
}
static void
msdosfs_hashrem(dep)
struct denode *dep;
{
struct denode *deq;
deq = dep->de_next;
if (deq)
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deq->de_prev = dep->de_prev;
*dep->de_prev = deq;
#ifdef DIAGNOSTIC
dep->de_next = NULL;
dep->de_prev = NULL;
#endif
}
/*
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* If deget() succeeds it returns with the gotten denode locked().
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*
* pmp - address of msdosfsmount structure of the filesystem containing
* the denode of interest. The pm_dev field and the address of
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* the msdosfsmount structure are used.
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* dirclust - which cluster bp contains, if dirclust is 0 (root directory)
* diroffset is relative to the beginning of the root directory,
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* otherwise it is cluster relative.
* diroffset - offset past begin of cluster of denode we want
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* direntptr - address of the direntry structure of interest. If direntptr is
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* NULL, the block is read if necessary.
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* depp - returns the address of the gotten denode.
*/
int
deget(pmp, dirclust, diroffset, direntptr, depp)
struct msdosfsmount *pmp; /* so we know the maj/min number */
u_long dirclust; /* cluster this dir entry came from */
u_long diroffset; /* index of entry within the cluster */
struct direntry *direntptr;
struct denode **depp; /* returns the addr of the gotten denode */
{
int error;
dev_t dev = pmp->pm_dev;
struct mount *mntp = pmp->pm_mountp;
struct denode *ldep;
struct vnode *nvp;
struct buf *bp;
#ifdef MSDOSFS_DEBUG
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printf("deget(pmp %p, dirclust %ld, diroffset %x, direntptr %p, depp %p)\n",
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pmp, dirclust, diroffset, direntptr, depp);
#endif
/*
* If dir entry is given and refers to a directory, convert to
* canonical form
*/
if (direntptr && (direntptr->deAttributes & ATTR_DIRECTORY)) {
dirclust = getushort(direntptr->deStartCluster);
if (dirclust == MSDOSFSROOT)
diroffset = MSDOSFSROOT_OFS;
else
diroffset = 0;
}
/*
* See if the denode is in the denode cache. Use the location of
* the directory entry to compute the hash value. For subdir use
* address of "." entry. for root dir use cluster MSDOSFSROOT,
* offset MSDOSFSROOT_OFS
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*
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* NOTE: The check for de_refcnt > 0 below insures the denode being
* examined does not represent an unlinked but still open file.
* These files are not to be accessible even when the directory
* entry that represented the file happens to be reused while the
* deleted file is still open.
*/
ldep = msdosfs_hashget(dev, dirclust, diroffset);
if (ldep) {
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*depp = ldep;
return 0;
}
/*
* Directory entry was not in cache, have to create a vnode and
* copy it from the passed disk buffer.
*/
/* getnewvnode() does a VREF() on the vnode */
error = getnewvnode(VT_MSDOSFS, mntp, msdosfs_vnodeop_p, &nvp);
if (error) {
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*depp = 0;
return error;
}
MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK);
bzero((caddr_t)ldep, sizeof *ldep);
nvp->v_data = ldep;
ldep->de_vnode = nvp;
ldep->de_flag = 0;
ldep->de_devvp = 0;
ldep->de_lockf = 0;
ldep->de_dev = dev;
ldep->de_dirclust = dirclust;
ldep->de_diroffset = diroffset;
fc_purge(ldep, 0); /* init the fat cache for this denode */
/*
* Insert the denode into the hash queue and lock the denode so it
* can't be accessed until we've read it in and have done what we
* need to it.
*/
VOP_LOCK(nvp);
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msdosfs_hashins(ldep);
/*
* Copy the directory entry into the denode area of the vnode.
*/
if (dirclust == MSDOSFSROOT && diroffset == MSDOSFSROOT_OFS) {
/*
* Directory entry for the root directory. There isn't one,
* so we manufacture one. We should probably rummage
* through the root directory and find a label entry (if it
* exists), and then use the time and date from that entry
* as the time and date for the root denode.
*/
ldep->de_Attributes = ATTR_DIRECTORY;
ldep->de_StartCluster = MSDOSFSROOT;
ldep->de_FileSize = pmp->pm_rootdirsize * pmp->pm_BytesPerSec;
/*
* fill in time and date so that dos2unixtime() doesn't
* spit up when called from msdosfs_getattr() with root
* denode
*/
ldep->de_Time = 0x0000; /* 00:00:00 */
ldep->de_Date = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
| (1 << DD_DAY_SHIFT);
/* Jan 1, 1980 */
/* leave the other fields as garbage */
} else {
bp = NULL;
if (!direntptr) {
error = readep(pmp, dirclust, diroffset, &bp,
&direntptr);
if (error)
return error;
}
DE_INTERNALIZE(ldep, direntptr);
if (bp)
brelse(bp);
}
/*
* Fill in a few fields of the vnode and finish filling in the
* denode. Then return the address of the found denode.
*/
ldep->de_pmp = pmp;
ldep->de_devvp = pmp->pm_devvp;
ldep->de_refcnt = 1;
if (ldep->de_Attributes & ATTR_DIRECTORY) {
/*
* Since DOS directory entries that describe directories
* have 0 in the filesize field, we take this opportunity
* to find out the length of the directory and plug it into
* the denode structure.
*/
u_long size;
nvp->v_type = VDIR;
if (ldep->de_StartCluster == MSDOSFSROOT)
nvp->v_flag |= VROOT;
else {
error = pcbmap(ldep, 0xffff, 0, &size);
if (error == E2BIG) {
ldep->de_FileSize = size << pmp->pm_cnshift;
error = 0;
} else
printf("deget(): pcbmap returned %d\n", error);
}
} else
nvp->v_type = VREG;
SETHIGH(ldep->de_modrev, mono_time.tv_sec);
SETLOW(ldep->de_modrev, mono_time.tv_usec * 4294);
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VREF(ldep->de_devvp);
*depp = ldep;
return 0;
}
int
deupdat(dep, tp, waitfor)
struct denode *dep;
struct timespec *tp;
int waitfor;
{
int error;
struct buf *bp;
struct direntry *dirp;
struct vnode *vp = DETOV(dep);
#ifdef MSDOSFS_DEBUG
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printf("deupdat(): dep %p\n", dep);
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#endif
/*
* If the denode-modified and update-mtime bits are off,
* or this denode is from a readonly filesystem,
* or this denode is for a directory,
* or the denode represents an open but unlinked file,
* then don't do anything. DOS directory
* entries that describe a directory do not ever get
* updated. This is the way DOS treats them.
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*/
if ((dep->de_flag & (DE_MODIFIED | DE_UPDATE)) == 0 ||
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vp->v_mount->mnt_flag & MNT_RDONLY ||
dep->de_Attributes & ATTR_DIRECTORY ||
dep->de_refcnt <= 0)
return 0;
/*
* Read in the cluster containing the directory entry we want to
* update.
*/
error = readde(dep, &bp, &dirp);
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if (error)
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return error;
/*
* If the mtime is to be updated, put the passed in time into the
* directory entry.
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*/
if (dep->de_flag & DE_UPDATE) {
dep->de_Attributes |= ATTR_ARCHIVE;
unix2dostime(tp, &dep->de_Date, &dep->de_Time);
}
/*
* The mtime is now up to date. The denode will be unmodifed soon.
*/
dep->de_flag &= ~(DE_MODIFIED | DE_UPDATE);
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/*
* Copy the directory entry out of the denode into the cluster it
* came from.
*/
DE_EXTERNALIZE(dirp, dep);
/*
* Write the cluster back to disk. If they asked for us to wait
* for the write to complete, then use bwrite() otherwise use
* bdwrite().
*/
error = 0; /* note that error is 0 from above, but ... */
if (waitfor)
error = bwrite(bp);
else
bdwrite(bp);
return error;
}
/*
* Truncate the file described by dep to the length specified by length.
*/
int
detrunc(dep, length, flags, cred, p)
struct denode *dep;
u_long length;
int flags;
struct ucred *cred;
struct proc *p;
{
int error;
int allerror;
int vflags;
u_long eofentry;
u_long chaintofree;
daddr_t bn;
int boff;
int isadir = dep->de_Attributes & ATTR_DIRECTORY;
struct buf *bp;
struct msdosfsmount *pmp = dep->de_pmp;
struct timespec ts;
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#ifdef MSDOSFS_DEBUG
printf("detrunc(): file %s, length %d, flags %d\n", dep->de_Name, length, flags);
#endif
/*
* Disallow attempts to truncate the root directory since it is of
* fixed size. That's just the way dos filesystems are. We use
* the VROOT bit in the vnode because checking for the directory
* bit and a startcluster of 0 in the denode is not adequate to
* recognize the root directory at this point in a file or
* directory's life.
*/
if (DETOV(dep)->v_flag & VROOT) {
printf(
"detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
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dep->de_dirclust, dep->de_diroffset);
return EINVAL;
}
if (dep->de_FileSize < length) {
vnode_pager_setsize(DETOV(dep), length);
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return deextend(dep, length, cred);
}
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/*
* If the desired length is 0 then remember the starting cluster of
* the file and set the StartCluster field in the directory entry
* to 0. If the desired length is not zero, then get the number of
* the last cluster in the shortened file. Then get the number of
* the first cluster in the part of the file that is to be freed.
* Then set the next cluster pointer in the last cluster of the
* file to CLUST_EOFE.
*/
if (length == 0) {
chaintofree = dep->de_StartCluster;
dep->de_StartCluster = 0;
eofentry = ~0;
} else {
error = pcbmap(dep, de_clcount(pmp, length) - 1, 0, &eofentry);
if (error) {
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#ifdef MSDOSFS_DEBUG
printf("detrunc(): pcbmap fails %d\n", error);
#endif
return error;
}
}
fc_purge(dep, (length + pmp->pm_crbomask) >> pmp->pm_cnshift);
/*
* If the new length is not a multiple of the cluster size then we
* must zero the tail end of the new last cluster in case it
* becomes part of the file again because of a seek.
*/
if ((boff = length & pmp->pm_crbomask) != 0) {
/*
* should read from file vnode or filesystem vnode
* depending on if file or dir
*/
if (isadir) {
bn = cntobn(pmp, eofentry);
error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
NOCRED, &bp);
} else {
bn = de_blk(pmp, length);
error = bread(DETOV(dep), bn, pmp->pm_bpcluster,
NOCRED, &bp);
}
if (error) {
#ifdef MSDOSFS_DEBUG
printf("detrunc(): bread fails %d\n", error);
#endif
return error;
}
/*
* is this the right place for it?
*/
bzero(bp->b_data + boff, pmp->pm_bpcluster - boff);
if (flags & IO_SYNC)
bwrite(bp);
else
bdwrite(bp);
}
/*
* Write out the updated directory entry. Even if the update fails
* we free the trailing clusters.
*/
dep->de_FileSize = length;
dep->de_flag |= DE_UPDATE;
vflags = (length > 0 ? V_SAVE : 0) | V_SAVEMETA;
vinvalbuf(DETOV(dep), vflags, cred, p, 0, 0);
vnode_pager_setsize(DETOV(dep), length);
TIMEVAL_TO_TIMESPEC(&time, &ts);
allerror = deupdat(dep, &ts, 1);
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#ifdef MSDOSFS_DEBUG
printf("detrunc(): allerror %d, eofentry %d\n",
allerror, eofentry);
#endif
/*
* If we need to break the cluster chain for the file then do it
* now.
*/
if (eofentry != ~0) {
error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
&chaintofree, CLUST_EOFE);
if (error) {
#ifdef MSDOSFS_DEBUG
printf("detrunc(): fatentry errors %d\n", error);
#endif
return error;
}
fc_setcache(dep, FC_LASTFC, (length - 1) >> pmp->pm_cnshift,
eofentry);
}
/*
* Now free the clusters removed from the file because of the
* truncation.
*/
if (chaintofree != 0 && !MSDOSFSEOF(chaintofree))
freeclusterchain(pmp, chaintofree);
return allerror;
}
/*
* Extend the file described by dep to length specified by length.
*/
int
deextend(dep, length, cred)
struct denode *dep;
off_t length;
struct ucred *cred;
{
struct msdosfsmount *pmp = dep->de_pmp;
u_long count;
int error;
struct timespec ts;
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/*
* The root of a DOS filesystem cannot be extended.
*/
if (DETOV(dep)->v_flag & VROOT)
return EINVAL;
/*
* Directories can only be extended by the superuser.
* Is this really important?
*/
if (dep->de_Attributes & ATTR_DIRECTORY) {
error = suser(cred, NULL);
if (error)
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return error;
}
if (length <= dep->de_FileSize)
panic("deextend: file too large");
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/*
* Compute the number of clusters to allocate.
*/
count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
if (count > 0) {
if (count > pmp->pm_freeclustercount)
return ENOSPC;
error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
if (error) {
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/* truncate the added clusters away again */
(void) detrunc(dep, dep->de_FileSize, 0, cred, NULL);
return error;
}
}
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dep->de_flag |= DE_UPDATE;
dep->de_FileSize = length;
TIMEVAL_TO_TIMESPEC(&time, &ts);
return deupdat(dep, &ts, 1);
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}
/*
* Move a denode to its correct hash queue after the file it represents has
* been moved to a new directory.
*/
int reinsert(dep)
struct denode *dep;
{
/*
* Fix up the denode cache. If the denode is for a directory,
* there is nothing to do since the hash is based on the starting
* cluster of the directory file and that hasn't changed. If for a
* file the hash is based on the location of the directory entry,
* so we must remove it from the cache and re-enter it with the
* hash based on the new location of the directory entry.
*/
if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) {
msdosfs_hashrem(dep);
msdosfs_hashins(dep);
}
return 0;
}
int
msdosfs_reclaim(ap)
struct vop_reclaim_args /* {
struct vnode *a_vp;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct denode *dep = VTODE(vp);
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#ifdef MSDOSFS_DEBUG
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printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
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dep, dep->de_Name, dep->de_refcnt);
#endif
if (prtactive && vp->v_usecount != 0)
vprint("msdosfs_reclaim(): pushing active", vp);
/*
* Remove the denode from the denode hash chain we are in.
*/
msdosfs_hashrem(dep);
cache_purge(vp);
/*
* Indicate that one less file on the filesystem is open.
*/
if (dep->de_devvp) {
vrele(dep->de_devvp);
dep->de_devvp = 0;
}
dep->de_flag = 0;
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FREE(dep, M_MSDOSFSNODE);
vp->v_data = NULL;
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return 0;
}
int
msdosfs_inactive(ap)
struct vop_inactive_args /* {
struct vnode *a_vp;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct denode *dep = VTODE(vp);
int error = 0;
struct timespec ts;
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#ifdef MSDOSFS_DEBUG
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printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
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#endif
if (prtactive && vp->v_usecount != 0)
vprint("msdosfs_inactive(): pushing active", vp);
/*
* Get rid of denodes related to stale file handles. Hmmm, what
* does this really do?
*/
if (dep->de_Name[0] == SLOT_DELETED) {
if ((vp->v_flag & VXLOCK) == 0)
vgone(vp);
return 0;
}
/*
* If the file has been deleted and it is on a read/write
* filesystem, then truncate the file, and mark the directory slot
* as empty. (This may not be necessary for the dos filesystem.)
*/
#ifdef MSDOSFS_DEBUG
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printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n",
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dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY);
#endif
VOP_LOCK(vp);
if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
error = detrunc(dep, (u_long) 0, 0, NOCRED, NULL);
dep->de_flag |= DE_UPDATE;
dep->de_Name[0] = SLOT_DELETED;
}
if (dep->de_flag & (DE_MODIFIED | DE_UPDATE)) {
TIMEVAL_TO_TIMESPEC(&time, &ts);
deupdat(dep, &ts, 0);
}
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VOP_UNLOCK(vp);
dep->de_flag = 0;
/*
* If we are done with the denode, then reclaim it so that it can
* be reused now.
*/
#ifdef MSDOSFS_DEBUG
printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", vp->v_usecount,
dep->de_Name[0]);
#endif
if (vp->v_usecount == 0 && dep->de_Name[0] == SLOT_DELETED)
vgone(vp);
return error;
}