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-rw-r--r--sys/fs/msdosfs/msdosfs_denode.c712
1 files changed, 712 insertions, 0 deletions
diff --git a/sys/fs/msdosfs/msdosfs_denode.c b/sys/fs/msdosfs/msdosfs_denode.c
new file mode 100644
index 0000000..d864ddb
--- /dev/null
+++ b/sys/fs/msdosfs/msdosfs_denode.c
@@ -0,0 +1,712 @@
+/* $FreeBSD$ */
+/* $NetBSD: msdosfs_denode.c,v 1.28 1998/02/10 14:10:00 mrg Exp $ */
+
+/*-
+ * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
+ * Copyright (C) 1994, 1995, 1997 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
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/mount.h>
+#include <sys/malloc.h>
+#include <sys/proc.h>
+#include <sys/buf.h>
+#include <sys/vnode.h>
+
+#include <vm/vm.h>
+#include <vm/vm_extern.h>
+
+#include <msdosfs/bpb.h>
+#include <msdosfs/msdosfsmount.h>
+#include <msdosfs/direntry.h>
+#include <msdosfs/denode.h>
+#include <msdosfs/fat.h>
+
+static MALLOC_DEFINE(M_MSDOSFSNODE, "MSDOSFS node", "MSDOSFS vnode private part");
+
+static struct denode **dehashtbl;
+static u_long dehash; /* size of hash table - 1 */
+#define DEHASH(dev, dcl, doff) (dehashtbl[(minor(dev) + (dcl) + (doff) / \
+ sizeof(struct direntry)) & dehash])
+#ifndef NULL_SIMPLELOCKS
+static struct simplelock dehash_slock;
+#endif
+
+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; \
+}
+
+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));
+
+/*ARGSUSED*/
+int
+msdosfs_init(vfsp)
+ struct vfsconf *vfsp;
+{
+ dehashtbl = hashinit(desiredvnodes/2, M_MSDOSFSMNT, &dehash);
+ simple_lock_init(&dehash_slock);
+ return (0);
+}
+
+static struct denode *
+msdosfs_hashget(dev, dirclust, diroff)
+ dev_t dev;
+ u_long dirclust;
+ u_long diroff;
+{
+ struct proc *p = curproc; /* XXX */
+ struct denode *dep;
+ struct vnode *vp;
+
+loop:
+ simple_lock(&dehash_slock);
+ for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) {
+ if (dirclust == dep->de_dirclust
+ && diroff == dep->de_diroffset
+ && dev == dep->de_dev
+ && dep->de_refcnt != 0) {
+ vp = DETOV(dep);
+ simple_lock(&vp->v_interlock);
+ simple_unlock(&dehash_slock);
+ if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p))
+ goto loop;
+ return (dep);
+ }
+ }
+ simple_unlock(&dehash_slock);
+ return (NULL);
+}
+
+static void
+msdosfs_hashins(dep)
+ struct denode *dep;
+{
+ struct denode **depp, *deq;
+
+ simple_lock(&dehash_slock);
+ depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset);
+ deq = *depp;
+ if (deq)
+ deq->de_prev = &dep->de_next;
+ dep->de_next = deq;
+ dep->de_prev = depp;
+ *depp = dep;
+ simple_unlock(&dehash_slock);
+}
+
+static void
+msdosfs_hashrem(dep)
+ struct denode *dep;
+{
+ struct denode *deq;
+
+ simple_lock(&dehash_slock);
+ deq = dep->de_next;
+ if (deq)
+ deq->de_prev = dep->de_prev;
+ *dep->de_prev = deq;
+#ifdef DIAGNOSTIC
+ dep->de_next = NULL;
+ dep->de_prev = NULL;
+#endif
+ simple_unlock(&dehash_slock);
+}
+
+/*
+ * If deget() succeeds it returns with the gotten denode locked().
+ *
+ * pmp - address of msdosfsmount structure of the filesystem containing
+ * the denode of interest. The pm_dev field and the address of
+ * the msdosfsmount structure are used.
+ * dirclust - which cluster bp contains, if dirclust is 0 (root directory)
+ * diroffset is relative to the beginning of the root directory,
+ * otherwise it is cluster relative.
+ * diroffset - offset past begin of cluster of denode we want
+ * depp - returns the address of the gotten denode.
+ */
+int
+deget(pmp, dirclust, diroffset, 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 denode **depp; /* returns the addr of the gotten denode */
+{
+ int error;
+ dev_t dev = pmp->pm_dev;
+ struct mount *mntp = pmp->pm_mountp;
+ struct direntry *direntptr;
+ struct denode *ldep;
+ struct vnode *nvp;
+ struct buf *bp;
+ struct proc *p = curproc; /* XXX */
+ struct timeval tv;
+
+#ifdef MSDOSFS_DEBUG
+ printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n",
+ pmp, dirclust, diroffset, depp);
+#endif
+
+ /*
+ * On FAT32 filesystems, root is a (more or less) normal
+ * directory
+ */
+ if (FAT32(pmp) && dirclust == MSDOSFSROOT)
+ dirclust = pmp->pm_rootdirblk;
+
+ /*
+ * 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 (if not FAT32) use cluster
+ * MSDOSFSROOT, offset MSDOSFSROOT_OFS
+ *
+ * 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) {
+ *depp = ldep;
+ return (0);
+ }
+
+ /*
+ * Do the MALLOC before the getnewvnode since doing so afterward
+ * might cause a bogus v_data pointer to get dereferenced
+ * elsewhere if MALLOC should block.
+ */
+ MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK);
+
+ /*
+ * 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) {
+ *depp = NULL;
+ FREE(ldep, M_MSDOSFSNODE);
+ return error;
+ }
+ bzero((caddr_t)ldep, sizeof *ldep);
+ lockinit(&ldep->de_lock, PINOD, "denode", 0, 0);
+ nvp->v_data = ldep;
+ ldep->de_vnode = nvp;
+ ldep->de_flag = 0;
+ ldep->de_devvp = 0;
+ ldep->de_dev = dev;
+ ldep->de_dirclust = dirclust;
+ ldep->de_diroffset = diroffset;
+ fc_purge(ldep, 0); /* init the fat cache for this denode */
+
+ /*
+ * Lock the denode so that it can't be accessed until we've read
+ * it in and have done what we need to it. Do this here instead
+ * of at the start of msdosfs_hashins() so that reinsert() can
+ * call msdosfs_hashins() with a locked denode.
+ */
+ if (lockmgr(&ldep->de_lock, LK_EXCLUSIVE, (struct simplelock *)0, p))
+ panic("deget: unexpected lock failure");
+
+ /*
+ * Insert the denode into the hash queue.
+ */
+ msdosfs_hashins(ldep);
+
+ ldep->de_pmp = pmp;
+ ldep->de_refcnt = 1;
+ /*
+ * Copy the directory entry into the denode area of the vnode.
+ */
+ if ((dirclust == MSDOSFSROOT
+ || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
+ && 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.
+ */
+ nvp->v_flag |= VROOT; /* should be further down XXX */
+
+ ldep->de_Attributes = ATTR_DIRECTORY;
+ ldep->de_LowerCase = 0;
+ if (FAT32(pmp))
+ ldep->de_StartCluster = pmp->pm_rootdirblk;
+ /* de_FileSize will be filled in further down */
+ else {
+ 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_CHun = 0;
+ ldep->de_CTime = 0x0000; /* 00:00:00 */
+ ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
+ | (1 << DD_DAY_SHIFT);
+ /* Jan 1, 1980 */
+ ldep->de_ADate = ldep->de_CDate;
+ ldep->de_MTime = ldep->de_CTime;
+ ldep->de_MDate = ldep->de_CDate;
+ /* leave the other fields as garbage */
+ } else {
+ error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
+ if (error) {
+ /*
+ * The denode does not contain anything useful, so
+ * it would be wrong to leave it on its hash chain.
+ * Arrange for vput() to just forget about it.
+ */
+ ldep->de_Name[0] = SLOT_DELETED;
+
+ vput(nvp);
+ *depp = NULL;
+ return (error);
+ }
+ DE_INTERNALIZE(ldep, direntptr);
+ brelse(bp);
+ }
+
+ /*
+ * Fill in a few fields of the vnode and finish filling in the
+ * denode. Then return the address of the found denode.
+ */
+ 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) {
+ error = pcbmap(ldep, 0xffff, 0, &size, 0);
+ if (error == E2BIG) {
+ ldep->de_FileSize = de_cn2off(pmp, size);
+ error = 0;
+ } else
+ printf("deget(): pcbmap returned %d\n", error);
+ }
+ } else
+ nvp->v_type = VREG;
+ getmicrouptime(&tv);
+ SETHIGH(ldep->de_modrev, tv.tv_sec);
+ SETLOW(ldep->de_modrev, tv.tv_usec * 4294);
+ ldep->de_devvp = pmp->pm_devvp;
+ VREF(ldep->de_devvp);
+ *depp = ldep;
+ return (0);
+}
+
+int
+deupdat(dep, waitfor)
+ struct denode *dep;
+ int waitfor;
+{
+ int error;
+ struct buf *bp;
+ struct direntry *dirp;
+ struct timespec ts;
+
+ if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY)
+ return (0);
+ getnanotime(&ts);
+ DETIMES(dep, &ts, &ts, &ts);
+ if ((dep->de_flag & DE_MODIFIED) == 0)
+ return (0);
+ dep->de_flag &= ~DE_MODIFIED;
+ if (dep->de_Attributes & ATTR_DIRECTORY)
+ return (0);
+ if (dep->de_refcnt <= 0)
+ return (0);
+ error = readde(dep, &bp, &dirp);
+ if (error)
+ return (error);
+ DE_EXTERNALIZE(dirp, dep);
+ if (waitfor)
+ return (bwrite(bp));
+ else {
+ bdwrite(bp);
+ return (0);
+ }
+}
+
+/*
+ * 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;
+ 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;
+
+#ifdef MSDOSFS_DEBUG
+ printf("detrunc(): file %s, length %lu, flags %x\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) && !FAT32(pmp)) {
+ printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
+ dep->de_dirclust, dep->de_diroffset);
+ return (EINVAL);
+ }
+
+
+ if (dep->de_FileSize < length) {
+ vnode_pager_setsize(DETOV(dep), length);
+ return deextend(dep, length, cred);
+ }
+
+ /*
+ * 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, 0);
+ if (error) {
+#ifdef MSDOSFS_DEBUG
+ printf("detrunc(): pcbmap fails %d\n", error);
+#endif
+ return (error);
+ }
+ }
+
+ fc_purge(dep, de_clcount(pmp, length));
+
+ /*
+ * 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) {
+ 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) {
+ brelse(bp);
+#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;
+ if (!isadir)
+ dep->de_flag |= DE_UPDATE|DE_MODIFIED;
+ allerror = vtruncbuf(DETOV(dep), cred, p, length, pmp->pm_bpcluster);
+#ifdef MSDOSFS_DEBUG
+ if (allerror)
+ printf("detrunc(): vtruncbuf error %d\n", allerror);
+#endif
+ error = deupdat(dep, 1);
+ if (error && (allerror == 0))
+ allerror = error;
+#ifdef MSDOSFS_DEBUG
+ printf("detrunc(): allerror %d, eofentry %lu\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, de_cluster(pmp, length - 1),
+ eofentry);
+ }
+
+ /*
+ * Now free the clusters removed from the file because of the
+ * truncation.
+ */
+ if (chaintofree != 0 && !MSDOSFSEOF(pmp, 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;
+ u_long length;
+ struct ucred *cred;
+{
+ struct msdosfsmount *pmp = dep->de_pmp;
+ u_long count;
+ int error;
+
+ /*
+ * The root of a DOS filesystem cannot be extended.
+ */
+ if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp))
+ return (EINVAL);
+
+ /*
+ * Directories cannot be extended.
+ */
+ if (dep->de_Attributes & ATTR_DIRECTORY)
+ return (EISDIR);
+
+ if (length <= dep->de_FileSize)
+ panic("deextend: file too large");
+
+ /*
+ * 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) {
+ /* truncate the added clusters away again */
+ (void) detrunc(dep, dep->de_FileSize, 0, cred, NULL);
+ return (error);
+ }
+ }
+ dep->de_FileSize = length;
+ dep->de_flag |= DE_UPDATE|DE_MODIFIED;
+ return (deupdat(dep, 1));
+}
+
+/*
+ * Move a denode to its correct hash queue after the file it represents has
+ * been moved to a new directory.
+ */
+void
+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)
+ return;
+ msdosfs_hashrem(dep);
+ msdosfs_hashins(dep);
+}
+
+int
+msdosfs_reclaim(ap)
+ struct vop_reclaim_args /* {
+ struct vnode *a_vp;
+ } */ *ap;
+{
+ struct vnode *vp = ap->a_vp;
+ struct denode *dep = VTODE(vp);
+
+#ifdef MSDOSFS_DEBUG
+ printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
+ dep, dep->de_Name, dep->de_refcnt);
+#endif
+
+ if (prtactive && vp->v_usecount != 0)
+ vprint("msdosfs_reclaim(): pushing active", vp);
+ /*
+ * Remove the denode from its hash chain.
+ */
+ msdosfs_hashrem(dep);
+ /*
+ * Purge old data structures associated with the denode.
+ */
+ cache_purge(vp);
+ if (dep->de_devvp) {
+ vrele(dep->de_devvp);
+ dep->de_devvp = 0;
+ }
+#if 0 /* XXX */
+ dep->de_flag = 0;
+#endif
+ FREE(dep, M_MSDOSFSNODE);
+ vp->v_data = NULL;
+
+ return (0);
+}
+
+int
+msdosfs_inactive(ap)
+ struct vop_inactive_args /* {
+ struct vnode *a_vp;
+ struct proc *a_p;
+ } */ *ap;
+{
+ struct vnode *vp = ap->a_vp;
+ struct denode *dep = VTODE(vp);
+ struct proc *p = ap->a_p;
+ int error = 0;
+
+#ifdef MSDOSFS_DEBUG
+ printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
+#endif
+
+ if (prtactive && vp->v_usecount != 0)
+ vprint("msdosfs_inactive(): pushing active", vp);
+
+ /*
+ * Ignore denodes related to stale file handles.
+ */
+ if (dep->de_Name[0] == SLOT_DELETED)
+ goto out;
+
+ /*
+ * 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
+ printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n",
+ dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY);
+#endif
+ if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
+ error = detrunc(dep, (u_long) 0, 0, NOCRED, p);
+ dep->de_flag |= DE_UPDATE;
+ dep->de_Name[0] = SLOT_DELETED;
+ }
+ deupdat(dep, 0);
+
+out:
+ VOP_UNLOCK(vp, 0, p);
+ /*
+ * If we are done with the denode, reclaim it
+ * so that it can be reused immediately.
+ */
+#ifdef MSDOSFS_DEBUG
+ printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", vp->v_usecount,
+ dep->de_Name[0]);
+#endif
+ if (dep->de_Name[0] == SLOT_DELETED)
+ vrecycle(vp, (struct simplelock *)0, p);
+ return (error);
+}
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