xref: /freebsd/sys/fs/msdosfs/msdosfs_denode.c (revision 61b9d89ff0a7d4c7bcea7fd083db918e16de41a5)
1c3aac50fSPeter Wemm /* $FreeBSD$ */
2952a6212SJordan K. Hubbard /*	$NetBSD: msdosfs_denode.c,v 1.28 1998/02/10 14:10:00 mrg Exp $	*/
327a0bc89SDoug Rabson 
427a0bc89SDoug Rabson /*-
5952a6212SJordan K. Hubbard  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
6952a6212SJordan K. Hubbard  * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
727a0bc89SDoug Rabson  * All rights reserved.
827a0bc89SDoug Rabson  * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
927a0bc89SDoug Rabson  *
1027a0bc89SDoug Rabson  * Redistribution and use in source and binary forms, with or without
1127a0bc89SDoug Rabson  * modification, are permitted provided that the following conditions
1227a0bc89SDoug Rabson  * are met:
1327a0bc89SDoug Rabson  * 1. Redistributions of source code must retain the above copyright
1427a0bc89SDoug Rabson  *    notice, this list of conditions and the following disclaimer.
1527a0bc89SDoug Rabson  * 2. Redistributions in binary form must reproduce the above copyright
1627a0bc89SDoug Rabson  *    notice, this list of conditions and the following disclaimer in the
1727a0bc89SDoug Rabson  *    documentation and/or other materials provided with the distribution.
1827a0bc89SDoug Rabson  * 3. All advertising materials mentioning features or use of this software
1927a0bc89SDoug Rabson  *    must display the following acknowledgement:
2027a0bc89SDoug Rabson  *	This product includes software developed by TooLs GmbH.
2127a0bc89SDoug Rabson  * 4. The name of TooLs GmbH may not be used to endorse or promote products
2227a0bc89SDoug Rabson  *    derived from this software without specific prior written permission.
2327a0bc89SDoug Rabson  *
2427a0bc89SDoug Rabson  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
2527a0bc89SDoug Rabson  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
2627a0bc89SDoug Rabson  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
2727a0bc89SDoug Rabson  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
2827a0bc89SDoug Rabson  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
2927a0bc89SDoug Rabson  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
3027a0bc89SDoug Rabson  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
3127a0bc89SDoug Rabson  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
3227a0bc89SDoug Rabson  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
3327a0bc89SDoug Rabson  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
3427a0bc89SDoug Rabson  */
35d167cf6fSWarner Losh /*-
3627a0bc89SDoug Rabson  * Written by Paul Popelka (paulp@uts.amdahl.com)
3727a0bc89SDoug Rabson  *
3827a0bc89SDoug Rabson  * You can do anything you want with this software, just don't say you wrote
3927a0bc89SDoug Rabson  * it, and don't remove this notice.
4027a0bc89SDoug Rabson  *
4127a0bc89SDoug Rabson  * This software is provided "as is".
4227a0bc89SDoug Rabson  *
4327a0bc89SDoug Rabson  * The author supplies this software to be publicly redistributed on the
4427a0bc89SDoug Rabson  * understanding that the author is not responsible for the correct
4527a0bc89SDoug Rabson  * functioning of this software in any circumstances and is not liable for
4627a0bc89SDoug Rabson  * any damages caused by this software.
4727a0bc89SDoug Rabson  *
4827a0bc89SDoug Rabson  * October 1992
4927a0bc89SDoug Rabson  */
5027a0bc89SDoug Rabson 
5127a0bc89SDoug Rabson #include <sys/param.h>
5227a0bc89SDoug Rabson #include <sys/systm.h>
531c5bb3eaSPeter Wemm #include <sys/kernel.h>
5427a0bc89SDoug Rabson #include <sys/mount.h>
5527a0bc89SDoug Rabson #include <sys/malloc.h>
569626b608SPoul-Henning Kamp #include <sys/bio.h>
5727a0bc89SDoug Rabson #include <sys/buf.h>
583c960d93SPoul-Henning Kamp #include <sys/clock.h>
5927a0bc89SDoug Rabson #include <sys/vnode.h>
601b367556SJason Evans #include <sys/mutex.h>
6127a0bc89SDoug Rabson 
62c3c6d51eSPoul-Henning Kamp #include <vm/vm.h>
63efeaf95aSDavid Greenman #include <vm/vm_extern.h>
64c3c6d51eSPoul-Henning Kamp 
651166fb51SRuslan Ermilov #include <fs/msdosfs/bpb.h>
661166fb51SRuslan Ermilov #include <fs/msdosfs/msdosfsmount.h>
671166fb51SRuslan Ermilov #include <fs/msdosfs/direntry.h>
681166fb51SRuslan Ermilov #include <fs/msdosfs/denode.h>
691166fb51SRuslan Ermilov #include <fs/msdosfs/fat.h>
7027a0bc89SDoug Rabson 
715bb84bc8SRobert Watson static MALLOC_DEFINE(M_MSDOSFSNODE, "msdosfs_node", "MSDOSFS vnode private part");
7255166637SPoul-Henning Kamp 
73f4b423aeSPoul-Henning Kamp static int
74f4b423aeSPoul-Henning Kamp de_vncmpf(struct vnode *vp, void *arg)
75f4b423aeSPoul-Henning Kamp {
76f4b423aeSPoul-Henning Kamp 	struct denode *de;
77f4b423aeSPoul-Henning Kamp 	uint64_t *a;
78f4b423aeSPoul-Henning Kamp 
79f4b423aeSPoul-Henning Kamp 	a = arg;
80f4b423aeSPoul-Henning Kamp 	de = VTODE(vp);
81f4b423aeSPoul-Henning Kamp 	return (de->de_inode != *a);
82f4b423aeSPoul-Henning Kamp }
8327a0bc89SDoug Rabson 
8427a0bc89SDoug Rabson /*
8527a0bc89SDoug Rabson  * If deget() succeeds it returns with the gotten denode locked().
8627a0bc89SDoug Rabson  *
8727a0bc89SDoug Rabson  * pmp	     - address of msdosfsmount structure of the filesystem containing
883b97f388SPoul-Henning Kamp  *	       the denode of interest.  The address of
8927a0bc89SDoug Rabson  *	       the msdosfsmount structure are used.
9027a0bc89SDoug Rabson  * dirclust  - which cluster bp contains, if dirclust is 0 (root directory)
9127a0bc89SDoug Rabson  *	       diroffset is relative to the beginning of the root directory,
9227a0bc89SDoug Rabson  *	       otherwise it is cluster relative.
9327a0bc89SDoug Rabson  * diroffset - offset past begin of cluster of denode we want
9427a0bc89SDoug Rabson  * depp	     - returns the address of the gotten denode.
9527a0bc89SDoug Rabson  */
9627a0bc89SDoug Rabson int
97952a6212SJordan K. Hubbard deget(pmp, dirclust, diroffset, depp)
9827a0bc89SDoug Rabson 	struct msdosfsmount *pmp;	/* so we know the maj/min number */
9927a0bc89SDoug Rabson 	u_long dirclust;		/* cluster this dir entry came from */
10027a0bc89SDoug Rabson 	u_long diroffset;		/* index of entry within the cluster */
10127a0bc89SDoug Rabson 	struct denode **depp;		/* returns the addr of the gotten denode */
10227a0bc89SDoug Rabson {
10327a0bc89SDoug Rabson 	int error;
104f4b423aeSPoul-Henning Kamp 	uint64_t inode;
10527a0bc89SDoug Rabson 	struct mount *mntp = pmp->pm_mountp;
106952a6212SJordan K. Hubbard 	struct direntry *direntptr;
10727a0bc89SDoug Rabson 	struct denode *ldep;
108a30fc63bSPoul-Henning Kamp 	struct vnode *nvp, *xvp;
10927a0bc89SDoug Rabson 	struct buf *bp;
11061b9d89fSTor Egge 	struct thread *td;
11127a0bc89SDoug Rabson 
11227a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
113952a6212SJordan K. Hubbard 	printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n",
114952a6212SJordan K. Hubbard 	    pmp, dirclust, diroffset, depp);
11527a0bc89SDoug Rabson #endif
11627a0bc89SDoug Rabson 
11727a0bc89SDoug Rabson 	/*
118952a6212SJordan K. Hubbard 	 * On FAT32 filesystems, root is a (more or less) normal
119952a6212SJordan K. Hubbard 	 * directory
12027a0bc89SDoug Rabson 	 */
121952a6212SJordan K. Hubbard 	if (FAT32(pmp) && dirclust == MSDOSFSROOT)
122952a6212SJordan K. Hubbard 		dirclust = pmp->pm_rootdirblk;
12327a0bc89SDoug Rabson 
12427a0bc89SDoug Rabson 	/*
12527a0bc89SDoug Rabson 	 * See if the denode is in the denode cache. Use the location of
12627a0bc89SDoug Rabson 	 * the directory entry to compute the hash value. For subdir use
127952a6212SJordan K. Hubbard 	 * address of "." entry. For root dir (if not FAT32) use cluster
128952a6212SJordan K. Hubbard 	 * MSDOSFSROOT, offset MSDOSFSROOT_OFS
12927a0bc89SDoug Rabson 	 *
13027a0bc89SDoug Rabson 	 * NOTE: The check for de_refcnt > 0 below insures the denode being
13127a0bc89SDoug Rabson 	 * examined does not represent an unlinked but still open file.
13227a0bc89SDoug Rabson 	 * These files are not to be accessible even when the directory
13327a0bc89SDoug Rabson 	 * entry that represented the file happens to be reused while the
13427a0bc89SDoug Rabson 	 * deleted file is still open.
13527a0bc89SDoug Rabson 	 */
1365ddf2985SDavid E. O'Brien 	inode = (uint64_t)pmp->pm_bpcluster * dirclust + diroffset;
137f4b423aeSPoul-Henning Kamp 
138f4b423aeSPoul-Henning Kamp 	error = vfs_hash_get(mntp, inode, LK_EXCLUSIVE, curthread, &nvp,
139f4b423aeSPoul-Henning Kamp 	    de_vncmpf, &inode);
140a30fc63bSPoul-Henning Kamp 	if (error)
141a30fc63bSPoul-Henning Kamp 		return(error);
142a30fc63bSPoul-Henning Kamp 	if (nvp != NULL) {
143a30fc63bSPoul-Henning Kamp 		*depp = VTODE(nvp);
144f4b423aeSPoul-Henning Kamp 		KASSERT((*depp)->de_dirclust == dirclust, ("wrong dirclust"));
145f4b423aeSPoul-Henning Kamp 		KASSERT((*depp)->de_diroffset == diroffset, ("wrong diroffset"));
146952a6212SJordan K. Hubbard 		return (0);
14727a0bc89SDoug Rabson 	}
14827a0bc89SDoug Rabson 
1492f9bae59SDavid Greenman 	/*
1502f9bae59SDavid Greenman 	 * Do the MALLOC before the getnewvnode since doing so afterward
1512f9bae59SDavid Greenman 	 * might cause a bogus v_data pointer to get dereferenced
1522f9bae59SDavid Greenman 	 * elsewhere if MALLOC should block.
1532f9bae59SDavid Greenman 	 */
154a163d034SWarner Losh 	MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK);
15527a0bc89SDoug Rabson 
15627a0bc89SDoug Rabson 	/*
15727a0bc89SDoug Rabson 	 * Directory entry was not in cache, have to create a vnode and
15827a0bc89SDoug Rabson 	 * copy it from the passed disk buffer.
15927a0bc89SDoug Rabson 	 */
16027a0bc89SDoug Rabson 	/* getnewvnode() does a VREF() on the vnode */
161aec0fb7bSPoul-Henning Kamp 	error = getnewvnode("msdosfs", mntp, &msdosfs_vnodeops, &nvp);
162c3c6d51eSPoul-Henning Kamp 	if (error) {
1632f9bae59SDavid Greenman 		*depp = NULL;
1642f9bae59SDavid Greenman 		FREE(ldep, M_MSDOSFSNODE);
16527a0bc89SDoug Rabson 		return error;
16627a0bc89SDoug Rabson 	}
16727a0bc89SDoug Rabson 	bzero((caddr_t)ldep, sizeof *ldep);
16827a0bc89SDoug Rabson 	nvp->v_data = ldep;
16927a0bc89SDoug Rabson 	ldep->de_vnode = nvp;
17027a0bc89SDoug Rabson 	ldep->de_flag = 0;
17127a0bc89SDoug Rabson 	ldep->de_dirclust = dirclust;
17227a0bc89SDoug Rabson 	ldep->de_diroffset = diroffset;
173f4b423aeSPoul-Henning Kamp 	ldep->de_inode = inode;
17427a0bc89SDoug Rabson 	fc_purge(ldep, 0);	/* init the fat cache for this denode */
17527a0bc89SDoug Rabson 
17661b9d89fSTor Egge 	td = curthread;
17761b9d89fSTor Egge 	lockmgr(nvp->v_vnlock, LK_EXCLUSIVE, NULL, td);
17861b9d89fSTor Egge 	error = insmntque(nvp, mntp);
17961b9d89fSTor Egge 	if (error != 0) {
18061b9d89fSTor Egge 		FREE(ldep, M_MSDOSFSNODE);
18161b9d89fSTor Egge 		*depp = NULL;
18261b9d89fSTor Egge 		return (error);
18361b9d89fSTor Egge 	}
18461b9d89fSTor Egge 	error = vfs_hash_insert(nvp, inode, LK_EXCLUSIVE, td, &xvp,
185f4b423aeSPoul-Henning Kamp 	    de_vncmpf, &inode);
186a30fc63bSPoul-Henning Kamp 	if (error) {
187a30fc63bSPoul-Henning Kamp 		*depp = NULL;
188a30fc63bSPoul-Henning Kamp 		return (error);
189a30fc63bSPoul-Henning Kamp 	}
190a30fc63bSPoul-Henning Kamp 	if (xvp != NULL) {
191a30fc63bSPoul-Henning Kamp 		/* XXX: Not sure this is right */
192a30fc63bSPoul-Henning Kamp 		nvp = xvp;
193a30fc63bSPoul-Henning Kamp 		ldep->de_vnode = nvp;
194a30fc63bSPoul-Henning Kamp 	}
19527a0bc89SDoug Rabson 
196952a6212SJordan K. Hubbard 	ldep->de_pmp = pmp;
197952a6212SJordan K. Hubbard 	ldep->de_refcnt = 1;
19827a0bc89SDoug Rabson 	/*
19927a0bc89SDoug Rabson 	 * Copy the directory entry into the denode area of the vnode.
20027a0bc89SDoug Rabson 	 */
201952a6212SJordan K. Hubbard 	if ((dirclust == MSDOSFSROOT
202952a6212SJordan K. Hubbard 	     || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
203952a6212SJordan K. Hubbard 	    && diroffset == MSDOSFSROOT_OFS) {
20427a0bc89SDoug Rabson 		/*
20527a0bc89SDoug Rabson 		 * Directory entry for the root directory. There isn't one,
20627a0bc89SDoug Rabson 		 * so we manufacture one. We should probably rummage
20727a0bc89SDoug Rabson 		 * through the root directory and find a label entry (if it
20827a0bc89SDoug Rabson 		 * exists), and then use the time and date from that entry
20927a0bc89SDoug Rabson 		 * as the time and date for the root denode.
21027a0bc89SDoug Rabson 		 */
211e6e370a7SJeff Roberson 		nvp->v_vflag |= VV_ROOT; /* should be further down XXX */
212952a6212SJordan K. Hubbard 
21327a0bc89SDoug Rabson 		ldep->de_Attributes = ATTR_DIRECTORY;
214bad3d41dSDmitrij Tejblum 		ldep->de_LowerCase = 0;
215952a6212SJordan K. Hubbard 		if (FAT32(pmp))
216952a6212SJordan K. Hubbard 			ldep->de_StartCluster = pmp->pm_rootdirblk;
217952a6212SJordan K. Hubbard 			/* de_FileSize will be filled in further down */
218952a6212SJordan K. Hubbard 		else {
21927a0bc89SDoug Rabson 			ldep->de_StartCluster = MSDOSFSROOT;
22001f6cfbaSYoshihiro Takahashi 			ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE;
221952a6212SJordan K. Hubbard 		}
22227a0bc89SDoug Rabson 		/*
2233c960d93SPoul-Henning Kamp 		 * fill in time and date so that fattime2timespec() doesn't
22427a0bc89SDoug Rabson 		 * spit up when called from msdosfs_getattr() with root
22527a0bc89SDoug Rabson 		 * denode
22627a0bc89SDoug Rabson 		 */
227952a6212SJordan K. Hubbard 		ldep->de_CHun = 0;
228952a6212SJordan K. Hubbard 		ldep->de_CTime = 0x0000;	/* 00:00:00	 */
229952a6212SJordan K. Hubbard 		ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
23027a0bc89SDoug Rabson 		    | (1 << DD_DAY_SHIFT);
23127a0bc89SDoug Rabson 		/* Jan 1, 1980	 */
232952a6212SJordan K. Hubbard 		ldep->de_ADate = ldep->de_CDate;
233952a6212SJordan K. Hubbard 		ldep->de_MTime = ldep->de_CTime;
234952a6212SJordan K. Hubbard 		ldep->de_MDate = ldep->de_CDate;
23527a0bc89SDoug Rabson 		/* leave the other fields as garbage */
23627a0bc89SDoug Rabson 	} else {
237952a6212SJordan K. Hubbard 		error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
2385097a20dSBruce Evans 		if (error) {
2395097a20dSBruce Evans 			/*
2405097a20dSBruce Evans 			 * The denode does not contain anything useful, so
2415097a20dSBruce Evans 			 * it would be wrong to leave it on its hash chain.
2425097a20dSBruce Evans 			 * Arrange for vput() to just forget about it.
2435097a20dSBruce Evans 			 */
2445097a20dSBruce Evans 			ldep->de_Name[0] = SLOT_DELETED;
2455097a20dSBruce Evans 
2465097a20dSBruce Evans 			vput(nvp);
2475097a20dSBruce Evans 			*depp = NULL;
248952a6212SJordan K. Hubbard 			return (error);
2495097a20dSBruce Evans 		}
25027a0bc89SDoug Rabson 		DE_INTERNALIZE(ldep, direntptr);
25127a0bc89SDoug Rabson 		brelse(bp);
25227a0bc89SDoug Rabson 	}
25327a0bc89SDoug Rabson 
25427a0bc89SDoug Rabson 	/*
25527a0bc89SDoug Rabson 	 * Fill in a few fields of the vnode and finish filling in the
25627a0bc89SDoug Rabson 	 * denode.  Then return the address of the found denode.
25727a0bc89SDoug Rabson 	 */
25827a0bc89SDoug Rabson 	if (ldep->de_Attributes & ATTR_DIRECTORY) {
25927a0bc89SDoug Rabson 		/*
26027a0bc89SDoug Rabson 		 * Since DOS directory entries that describe directories
26127a0bc89SDoug Rabson 		 * have 0 in the filesize field, we take this opportunity
26227a0bc89SDoug Rabson 		 * to find out the length of the directory and plug it into
26327a0bc89SDoug Rabson 		 * the denode structure.
26427a0bc89SDoug Rabson 		 */
26527a0bc89SDoug Rabson 		u_long size;
26627a0bc89SDoug Rabson 
267b5cdbc6dSTom Rhodes 		/*
268b5cdbc6dSTom Rhodes 		 * XXX Sometimes, these arrives that . entry have cluster
269b5cdbc6dSTom Rhodes 		 * number 0, when it shouldn't.  Use real cluster number
270b5cdbc6dSTom Rhodes 		 * instead of what is written in directory entry.
271b5cdbc6dSTom Rhodes 		 */
272b5cdbc6dSTom Rhodes 		if ((diroffset == 0) && (ldep->de_StartCluster != dirclust)) {
273b5cdbc6dSTom Rhodes 			printf("deget(): . entry at clust %ld != %ld\n",
274b5cdbc6dSTom Rhodes 					dirclust, ldep->de_StartCluster);
275b5cdbc6dSTom Rhodes 			ldep->de_StartCluster = dirclust;
276b5cdbc6dSTom Rhodes 		}
277b5cdbc6dSTom Rhodes 
27827a0bc89SDoug Rabson 		nvp->v_type = VDIR;
279952a6212SJordan K. Hubbard 		if (ldep->de_StartCluster != MSDOSFSROOT) {
280952a6212SJordan K. Hubbard 			error = pcbmap(ldep, 0xffff, 0, &size, 0);
28127a0bc89SDoug Rabson 			if (error == E2BIG) {
282952a6212SJordan K. Hubbard 				ldep->de_FileSize = de_cn2off(pmp, size);
28327a0bc89SDoug Rabson 				error = 0;
28427a0bc89SDoug Rabson 			} else
28527a0bc89SDoug Rabson 				printf("deget(): pcbmap returned %d\n", error);
28627a0bc89SDoug Rabson 		}
28727a0bc89SDoug Rabson 	} else
28827a0bc89SDoug Rabson 		nvp->v_type = VREG;
2891affa3adSPoul-Henning Kamp 	ldep->de_modrev = init_va_filerev();
29027a0bc89SDoug Rabson 	*depp = ldep;
291952a6212SJordan K. Hubbard 	return (0);
29227a0bc89SDoug Rabson }
29327a0bc89SDoug Rabson 
29427a0bc89SDoug Rabson int
295952a6212SJordan K. Hubbard deupdat(dep, waitfor)
29627a0bc89SDoug Rabson 	struct denode *dep;
29727a0bc89SDoug Rabson 	int waitfor;
29827a0bc89SDoug Rabson {
29927a0bc89SDoug Rabson 	int error;
30027a0bc89SDoug Rabson 	struct buf *bp;
30127a0bc89SDoug Rabson 	struct direntry *dirp;
302952a6212SJordan K. Hubbard 	struct timespec ts;
30327a0bc89SDoug Rabson 
304952a6212SJordan K. Hubbard 	if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY)
305952a6212SJordan K. Hubbard 		return (0);
306a0502b19SPoul-Henning Kamp 	getnanotime(&ts);
307952a6212SJordan K. Hubbard 	DETIMES(dep, &ts, &ts, &ts);
308952a6212SJordan K. Hubbard 	if ((dep->de_flag & DE_MODIFIED) == 0)
309952a6212SJordan K. Hubbard 		return (0);
310952a6212SJordan K. Hubbard 	dep->de_flag &= ~DE_MODIFIED;
311952a6212SJordan K. Hubbard 	if (dep->de_Attributes & ATTR_DIRECTORY)
312952a6212SJordan K. Hubbard 		return (0);
313952a6212SJordan K. Hubbard 	if (dep->de_refcnt <= 0)
314952a6212SJordan K. Hubbard 		return (0);
315c3c6d51eSPoul-Henning Kamp 	error = readde(dep, &bp, &dirp);
316c3c6d51eSPoul-Henning Kamp 	if (error)
317952a6212SJordan K. Hubbard 		return (error);
31827a0bc89SDoug Rabson 	DE_EXTERNALIZE(dirp, dep);
31927a0bc89SDoug Rabson 	if (waitfor)
320952a6212SJordan K. Hubbard 		return (bwrite(bp));
321952a6212SJordan K. Hubbard 	else {
32227a0bc89SDoug Rabson 		bdwrite(bp);
323952a6212SJordan K. Hubbard 		return (0);
324952a6212SJordan K. Hubbard 	}
32527a0bc89SDoug Rabson }
32627a0bc89SDoug Rabson 
32727a0bc89SDoug Rabson /*
32827a0bc89SDoug Rabson  * Truncate the file described by dep to the length specified by length.
32927a0bc89SDoug Rabson  */
33027a0bc89SDoug Rabson int
331b40ce416SJulian Elischer detrunc(dep, length, flags, cred, td)
33227a0bc89SDoug Rabson 	struct denode *dep;
33327a0bc89SDoug Rabson 	u_long length;
33427a0bc89SDoug Rabson 	int flags;
33527a0bc89SDoug Rabson 	struct ucred *cred;
336b40ce416SJulian Elischer 	struct thread *td;
33727a0bc89SDoug Rabson {
33827a0bc89SDoug Rabson 	int error;
33927a0bc89SDoug Rabson 	int allerror;
34027a0bc89SDoug Rabson 	u_long eofentry;
34127a0bc89SDoug Rabson 	u_long chaintofree;
34227a0bc89SDoug Rabson 	daddr_t bn;
34327a0bc89SDoug Rabson 	int boff;
34427a0bc89SDoug Rabson 	int isadir = dep->de_Attributes & ATTR_DIRECTORY;
34527a0bc89SDoug Rabson 	struct buf *bp;
34627a0bc89SDoug Rabson 	struct msdosfsmount *pmp = dep->de_pmp;
34727a0bc89SDoug Rabson 
34827a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
349952a6212SJordan K. Hubbard 	printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
35027a0bc89SDoug Rabson #endif
35127a0bc89SDoug Rabson 
35227a0bc89SDoug Rabson 	/*
35327a0bc89SDoug Rabson 	 * Disallow attempts to truncate the root directory since it is of
35427a0bc89SDoug Rabson 	 * fixed size.  That's just the way dos filesystems are.  We use
35527a0bc89SDoug Rabson 	 * the VROOT bit in the vnode because checking for the directory
35627a0bc89SDoug Rabson 	 * bit and a startcluster of 0 in the denode is not adequate to
35727a0bc89SDoug Rabson 	 * recognize the root directory at this point in a file or
35827a0bc89SDoug Rabson 	 * directory's life.
35927a0bc89SDoug Rabson 	 */
360e6e370a7SJeff Roberson 	if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) {
361952a6212SJordan K. Hubbard 		printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
36227a0bc89SDoug Rabson 		    dep->de_dirclust, dep->de_diroffset);
363952a6212SJordan K. Hubbard 		return (EINVAL);
36427a0bc89SDoug Rabson 	}
36527a0bc89SDoug Rabson 
36627a0bc89SDoug Rabson 
367bd7e5f99SJohn Dyson 	if (dep->de_FileSize < length) {
368bd7e5f99SJohn Dyson 		vnode_pager_setsize(DETOV(dep), length);
36927a0bc89SDoug Rabson 		return deextend(dep, length, cred);
370bd7e5f99SJohn Dyson 	}
37127a0bc89SDoug Rabson 
37227a0bc89SDoug Rabson 	/*
37327a0bc89SDoug Rabson 	 * If the desired length is 0 then remember the starting cluster of
37427a0bc89SDoug Rabson 	 * the file and set the StartCluster field in the directory entry
37527a0bc89SDoug Rabson 	 * to 0.  If the desired length is not zero, then get the number of
37627a0bc89SDoug Rabson 	 * the last cluster in the shortened file.  Then get the number of
37727a0bc89SDoug Rabson 	 * the first cluster in the part of the file that is to be freed.
37827a0bc89SDoug Rabson 	 * Then set the next cluster pointer in the last cluster of the
37927a0bc89SDoug Rabson 	 * file to CLUST_EOFE.
38027a0bc89SDoug Rabson 	 */
38127a0bc89SDoug Rabson 	if (length == 0) {
38227a0bc89SDoug Rabson 		chaintofree = dep->de_StartCluster;
38327a0bc89SDoug Rabson 		dep->de_StartCluster = 0;
38427a0bc89SDoug Rabson 		eofentry = ~0;
38527a0bc89SDoug Rabson 	} else {
386952a6212SJordan K. Hubbard 		error = pcbmap(dep, de_clcount(pmp, length) - 1, 0,
387952a6212SJordan K. Hubbard 			       &eofentry, 0);
388c3c6d51eSPoul-Henning Kamp 		if (error) {
38927a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
39027a0bc89SDoug Rabson 			printf("detrunc(): pcbmap fails %d\n", error);
39127a0bc89SDoug Rabson #endif
392952a6212SJordan K. Hubbard 			return (error);
39327a0bc89SDoug Rabson 		}
39427a0bc89SDoug Rabson 	}
39527a0bc89SDoug Rabson 
396952a6212SJordan K. Hubbard 	fc_purge(dep, de_clcount(pmp, length));
39727a0bc89SDoug Rabson 
39827a0bc89SDoug Rabson 	/*
39927a0bc89SDoug Rabson 	 * If the new length is not a multiple of the cluster size then we
40027a0bc89SDoug Rabson 	 * must zero the tail end of the new last cluster in case it
40127a0bc89SDoug Rabson 	 * becomes part of the file again because of a seek.
40227a0bc89SDoug Rabson 	 */
40327a0bc89SDoug Rabson 	if ((boff = length & pmp->pm_crbomask) != 0) {
40427a0bc89SDoug Rabson 		if (isadir) {
40527a0bc89SDoug Rabson 			bn = cntobn(pmp, eofentry);
40627a0bc89SDoug Rabson 			error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
40727a0bc89SDoug Rabson 			    NOCRED, &bp);
40827a0bc89SDoug Rabson 			if (error) {
409952a6212SJordan K. Hubbard 				brelse(bp);
41027a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
41127a0bc89SDoug Rabson 				printf("detrunc(): bread fails %d\n", error);
41227a0bc89SDoug Rabson #endif
413952a6212SJordan K. Hubbard 				return (error);
41427a0bc89SDoug Rabson 			}
41527a0bc89SDoug Rabson 			bzero(bp->b_data + boff, pmp->pm_bpcluster - boff);
41627a0bc89SDoug Rabson 			if (flags & IO_SYNC)
41727a0bc89SDoug Rabson 				bwrite(bp);
41827a0bc89SDoug Rabson 			else
41927a0bc89SDoug Rabson 				bdwrite(bp);
42027a0bc89SDoug Rabson 		}
421c2f95f66STom Rhodes 	}
42227a0bc89SDoug Rabson 
42327a0bc89SDoug Rabson 	/*
42427a0bc89SDoug Rabson 	 * Write out the updated directory entry.  Even if the update fails
42527a0bc89SDoug Rabson 	 * we free the trailing clusters.
42627a0bc89SDoug Rabson 	 */
42727a0bc89SDoug Rabson 	dep->de_FileSize = length;
428952a6212SJordan K. Hubbard 	if (!isadir)
429952a6212SJordan K. Hubbard 		dep->de_flag |= DE_UPDATE|DE_MODIFIED;
430b40ce416SJulian Elischer 	allerror = vtruncbuf(DETOV(dep), cred, td, length, pmp->pm_bpcluster);
43144fdad99SPeter Wemm #ifdef MSDOSFS_DEBUG
43244fdad99SPeter Wemm 	if (allerror)
43344fdad99SPeter Wemm 		printf("detrunc(): vtruncbuf error %d\n", allerror);
43444fdad99SPeter Wemm #endif
43544fdad99SPeter Wemm 	error = deupdat(dep, 1);
43644fdad99SPeter Wemm 	if (error && (allerror == 0))
43744fdad99SPeter Wemm 		allerror = error;
43827a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
439952a6212SJordan K. Hubbard 	printf("detrunc(): allerror %d, eofentry %lu\n",
44027a0bc89SDoug Rabson 	       allerror, eofentry);
44127a0bc89SDoug Rabson #endif
44227a0bc89SDoug Rabson 
44327a0bc89SDoug Rabson 	/*
44427a0bc89SDoug Rabson 	 * If we need to break the cluster chain for the file then do it
44527a0bc89SDoug Rabson 	 * now.
44627a0bc89SDoug Rabson 	 */
44727a0bc89SDoug Rabson 	if (eofentry != ~0) {
44827a0bc89SDoug Rabson 		error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
44927a0bc89SDoug Rabson 				 &chaintofree, CLUST_EOFE);
45027a0bc89SDoug Rabson 		if (error) {
45127a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
45227a0bc89SDoug Rabson 			printf("detrunc(): fatentry errors %d\n", error);
45327a0bc89SDoug Rabson #endif
454952a6212SJordan K. Hubbard 			return (error);
45527a0bc89SDoug Rabson 		}
456952a6212SJordan K. Hubbard 		fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
45727a0bc89SDoug Rabson 			    eofentry);
45827a0bc89SDoug Rabson 	}
45927a0bc89SDoug Rabson 
46027a0bc89SDoug Rabson 	/*
46127a0bc89SDoug Rabson 	 * Now free the clusters removed from the file because of the
46227a0bc89SDoug Rabson 	 * truncation.
46327a0bc89SDoug Rabson 	 */
464952a6212SJordan K. Hubbard 	if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree))
46527a0bc89SDoug Rabson 		freeclusterchain(pmp, chaintofree);
46627a0bc89SDoug Rabson 
467952a6212SJordan K. Hubbard 	return (allerror);
46827a0bc89SDoug Rabson }
46927a0bc89SDoug Rabson 
47027a0bc89SDoug Rabson /*
47127a0bc89SDoug Rabson  * Extend the file described by dep to length specified by length.
47227a0bc89SDoug Rabson  */
47327a0bc89SDoug Rabson int
47427a0bc89SDoug Rabson deextend(dep, length, cred)
47527a0bc89SDoug Rabson 	struct denode *dep;
476952a6212SJordan K. Hubbard 	u_long length;
47727a0bc89SDoug Rabson 	struct ucred *cred;
47827a0bc89SDoug Rabson {
47927a0bc89SDoug Rabson 	struct msdosfsmount *pmp = dep->de_pmp;
48027a0bc89SDoug Rabson 	u_long count;
48127a0bc89SDoug Rabson 	int error;
48227a0bc89SDoug Rabson 
48327a0bc89SDoug Rabson 	/*
48427a0bc89SDoug Rabson 	 * The root of a DOS filesystem cannot be extended.
48527a0bc89SDoug Rabson 	 */
486e6e370a7SJeff Roberson 	if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp))
487952a6212SJordan K. Hubbard 		return (EINVAL);
48827a0bc89SDoug Rabson 
48927a0bc89SDoug Rabson 	/*
490952a6212SJordan K. Hubbard 	 * Directories cannot be extended.
49127a0bc89SDoug Rabson 	 */
492952a6212SJordan K. Hubbard 	if (dep->de_Attributes & ATTR_DIRECTORY)
493952a6212SJordan K. Hubbard 		return (EISDIR);
49427a0bc89SDoug Rabson 
49527a0bc89SDoug Rabson 	if (length <= dep->de_FileSize)
49627a0bc89SDoug Rabson 		panic("deextend: file too large");
49727a0bc89SDoug Rabson 
49827a0bc89SDoug Rabson 	/*
49927a0bc89SDoug Rabson 	 * Compute the number of clusters to allocate.
50027a0bc89SDoug Rabson 	 */
50127a0bc89SDoug Rabson 	count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
50227a0bc89SDoug Rabson 	if (count > 0) {
50327a0bc89SDoug Rabson 		if (count > pmp->pm_freeclustercount)
504952a6212SJordan K. Hubbard 			return (ENOSPC);
505c3c6d51eSPoul-Henning Kamp 		error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
506c3c6d51eSPoul-Henning Kamp 		if (error) {
50727a0bc89SDoug Rabson 			/* truncate the added clusters away again */
50827a0bc89SDoug Rabson 			(void) detrunc(dep, dep->de_FileSize, 0, cred, NULL);
509952a6212SJordan K. Hubbard 			return (error);
51027a0bc89SDoug Rabson 		}
51127a0bc89SDoug Rabson 	}
51227a0bc89SDoug Rabson 	dep->de_FileSize = length;
513952a6212SJordan K. Hubbard 	dep->de_flag |= DE_UPDATE|DE_MODIFIED;
514952a6212SJordan K. Hubbard 	return (deupdat(dep, 1));
51527a0bc89SDoug Rabson }
51627a0bc89SDoug Rabson 
51727a0bc89SDoug Rabson /*
51827a0bc89SDoug Rabson  * Move a denode to its correct hash queue after the file it represents has
51927a0bc89SDoug Rabson  * been moved to a new directory.
52027a0bc89SDoug Rabson  */
521952a6212SJordan K. Hubbard void
522952a6212SJordan K. Hubbard reinsert(dep)
52327a0bc89SDoug Rabson 	struct denode *dep;
52427a0bc89SDoug Rabson {
525a30fc63bSPoul-Henning Kamp 	struct vnode *vp;
526a30fc63bSPoul-Henning Kamp 
52727a0bc89SDoug Rabson 	/*
52827a0bc89SDoug Rabson 	 * Fix up the denode cache.  If the denode is for a directory,
52927a0bc89SDoug Rabson 	 * there is nothing to do since the hash is based on the starting
53027a0bc89SDoug Rabson 	 * cluster of the directory file and that hasn't changed.  If for a
53127a0bc89SDoug Rabson 	 * file the hash is based on the location of the directory entry,
53227a0bc89SDoug Rabson 	 * so we must remove it from the cache and re-enter it with the
53327a0bc89SDoug Rabson 	 * hash based on the new location of the directory entry.
53427a0bc89SDoug Rabson 	 */
535f4b423aeSPoul-Henning Kamp #if 0
536952a6212SJordan K. Hubbard 	if (dep->de_Attributes & ATTR_DIRECTORY)
537952a6212SJordan K. Hubbard 		return;
538f4b423aeSPoul-Henning Kamp #endif
539a30fc63bSPoul-Henning Kamp 	vp = DETOV(dep);
5405ddf2985SDavid E. O'Brien 	dep->de_inode = (uint64_t)dep->de_pmp->pm_bpcluster * dep->de_dirclust +
541f4b423aeSPoul-Henning Kamp 	     dep->de_diroffset;
542f4b423aeSPoul-Henning Kamp 	vfs_hash_rehash(vp, dep->de_inode);
54327a0bc89SDoug Rabson }
54427a0bc89SDoug Rabson 
54527a0bc89SDoug Rabson int
54627a0bc89SDoug Rabson msdosfs_reclaim(ap)
54727a0bc89SDoug Rabson 	struct vop_reclaim_args /* {
54827a0bc89SDoug Rabson 		struct vnode *a_vp;
54927a0bc89SDoug Rabson 	} */ *ap;
55027a0bc89SDoug Rabson {
55127a0bc89SDoug Rabson 	struct vnode *vp = ap->a_vp;
55227a0bc89SDoug Rabson 	struct denode *dep = VTODE(vp);
55327a0bc89SDoug Rabson 
55427a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
555f0707215SPoul-Henning Kamp 	printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
55627a0bc89SDoug Rabson 	    dep, dep->de_Name, dep->de_refcnt);
55727a0bc89SDoug Rabson #endif
55827a0bc89SDoug Rabson 
5594d93c0beSJeff Roberson 	if (prtactive && vrefcnt(vp) != 0)
56027a0bc89SDoug Rabson 		vprint("msdosfs_reclaim(): pushing active", vp);
56127a0bc89SDoug Rabson 	/*
56292e73f57SAlfred Perlstein 	 * Destroy the vm object and flush associated pages.
56392e73f57SAlfred Perlstein 	 */
56492e73f57SAlfred Perlstein 	vnode_destroy_vobject(vp);
56592e73f57SAlfred Perlstein 	/*
566952a6212SJordan K. Hubbard 	 * Remove the denode from its hash chain.
56727a0bc89SDoug Rabson 	 */
568a30fc63bSPoul-Henning Kamp 	vfs_hash_remove(vp);
56927a0bc89SDoug Rabson 	/*
570952a6212SJordan K. Hubbard 	 * Purge old data structures associated with the denode.
57127a0bc89SDoug Rabson 	 */
572952a6212SJordan K. Hubbard #if 0 /* XXX */
57327a0bc89SDoug Rabson 	dep->de_flag = 0;
574952a6212SJordan K. Hubbard #endif
57527a0bc89SDoug Rabson 	FREE(dep, M_MSDOSFSNODE);
57627a0bc89SDoug Rabson 	vp->v_data = NULL;
57727a0bc89SDoug Rabson 
578952a6212SJordan K. Hubbard 	return (0);
57927a0bc89SDoug Rabson }
58027a0bc89SDoug Rabson 
58127a0bc89SDoug Rabson int
58227a0bc89SDoug Rabson msdosfs_inactive(ap)
58327a0bc89SDoug Rabson 	struct vop_inactive_args /* {
58427a0bc89SDoug Rabson 		struct vnode *a_vp;
585b40ce416SJulian Elischer 		struct thread *a_td;
58627a0bc89SDoug Rabson 	} */ *ap;
58727a0bc89SDoug Rabson {
58827a0bc89SDoug Rabson 	struct vnode *vp = ap->a_vp;
58927a0bc89SDoug Rabson 	struct denode *dep = VTODE(vp);
590b40ce416SJulian Elischer 	struct thread *td = ap->a_td;
59127a0bc89SDoug Rabson 	int error = 0;
59227a0bc89SDoug Rabson 
59327a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
594f0707215SPoul-Henning Kamp 	printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
59527a0bc89SDoug Rabson #endif
59627a0bc89SDoug Rabson 
5974d93c0beSJeff Roberson 	if (prtactive && vrefcnt(vp) != 0)
59827a0bc89SDoug Rabson 		vprint("msdosfs_inactive(): pushing active", vp);
59927a0bc89SDoug Rabson 
60027a0bc89SDoug Rabson 	/*
601952a6212SJordan K. Hubbard 	 * Ignore denodes related to stale file handles.
60227a0bc89SDoug Rabson 	 */
603af3f60d5SBruce Evans 	if (dep->de_Name[0] == SLOT_DELETED)
604af3f60d5SBruce Evans 		goto out;
60527a0bc89SDoug Rabson 
60627a0bc89SDoug Rabson 	/*
60727a0bc89SDoug Rabson 	 * If the file has been deleted and it is on a read/write
60827a0bc89SDoug Rabson 	 * filesystem, then truncate the file, and mark the directory slot
60927a0bc89SDoug Rabson 	 * as empty.  (This may not be necessary for the dos filesystem.)
61027a0bc89SDoug Rabson 	 */
61127a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
612f0707215SPoul-Henning Kamp 	printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n",
61327a0bc89SDoug Rabson 	       dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY);
61427a0bc89SDoug Rabson #endif
61527a0bc89SDoug Rabson 	if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
616b40ce416SJulian Elischer 		error = detrunc(dep, (u_long) 0, 0, NOCRED, td);
61727a0bc89SDoug Rabson 		dep->de_flag |= DE_UPDATE;
61827a0bc89SDoug Rabson 		dep->de_Name[0] = SLOT_DELETED;
61927a0bc89SDoug Rabson 	}
620952a6212SJordan K. Hubbard 	deupdat(dep, 0);
621952a6212SJordan K. Hubbard 
622af3f60d5SBruce Evans out:
62327a0bc89SDoug Rabson 	/*
624952a6212SJordan K. Hubbard 	 * If we are done with the denode, reclaim it
625952a6212SJordan K. Hubbard 	 * so that it can be reused immediately.
62627a0bc89SDoug Rabson 	 */
62727a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
6284d93c0beSJeff Roberson 	printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n",
6294d93c0beSJeff Roberson 	       vrefcnt(vp), dep->de_Name[0]);
63027a0bc89SDoug Rabson #endif
631af3f60d5SBruce Evans 	if (dep->de_Name[0] == SLOT_DELETED)
632d4eb29baSPoul-Henning Kamp 		vrecycle(vp, td);
633952a6212SJordan K. Hubbard 	return (error);
63427a0bc89SDoug Rabson }
635