xref: /freebsd/sys/fs/msdosfs/msdosfs_denode.c (revision 8b36e81367550020a6118cce6b0a18aab01b33a2)
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>
5327a0bc89SDoug Rabson #include <sys/buf.h>
543c960d93SPoul-Henning Kamp #include <sys/clock.h>
55a878a31cSBruce Evans #include <sys/kernel.h>
56a878a31cSBruce Evans #include <sys/malloc.h>
57a878a31cSBruce Evans #include <sys/mount.h>
5827a0bc89SDoug Rabson #include <sys/vnode.h>
5927a0bc89SDoug Rabson 
60c3c6d51eSPoul-Henning Kamp #include <vm/vm.h>
61efeaf95aSDavid Greenman #include <vm/vm_extern.h>
62c3c6d51eSPoul-Henning Kamp 
631166fb51SRuslan Ermilov #include <fs/msdosfs/bpb.h>
641166fb51SRuslan Ermilov #include <fs/msdosfs/direntry.h>
651166fb51SRuslan Ermilov #include <fs/msdosfs/denode.h>
661166fb51SRuslan Ermilov #include <fs/msdosfs/fat.h>
67a878a31cSBruce Evans #include <fs/msdosfs/msdosfsmount.h>
6827a0bc89SDoug Rabson 
695bb84bc8SRobert Watson static MALLOC_DEFINE(M_MSDOSFSNODE, "msdosfs_node", "MSDOSFS vnode private part");
7055166637SPoul-Henning Kamp 
71f4b423aeSPoul-Henning Kamp static int
72f4b423aeSPoul-Henning Kamp de_vncmpf(struct vnode *vp, void *arg)
73f4b423aeSPoul-Henning Kamp {
74f4b423aeSPoul-Henning Kamp 	struct denode *de;
75f4b423aeSPoul-Henning Kamp 	uint64_t *a;
76f4b423aeSPoul-Henning Kamp 
77f4b423aeSPoul-Henning Kamp 	a = arg;
78f4b423aeSPoul-Henning Kamp 	de = VTODE(vp);
79f4b423aeSPoul-Henning Kamp 	return (de->de_inode != *a);
80f4b423aeSPoul-Henning Kamp }
8127a0bc89SDoug Rabson 
8227a0bc89SDoug Rabson /*
8327a0bc89SDoug Rabson  * If deget() succeeds it returns with the gotten denode locked().
8427a0bc89SDoug Rabson  *
8527a0bc89SDoug Rabson  * pmp	     - address of msdosfsmount structure of the filesystem containing
863b97f388SPoul-Henning Kamp  *	       the denode of interest.  The address of
8727a0bc89SDoug Rabson  *	       the msdosfsmount structure are used.
8827a0bc89SDoug Rabson  * dirclust  - which cluster bp contains, if dirclust is 0 (root directory)
8927a0bc89SDoug Rabson  *	       diroffset is relative to the beginning of the root directory,
9027a0bc89SDoug Rabson  *	       otherwise it is cluster relative.
9127a0bc89SDoug Rabson  * diroffset - offset past begin of cluster of denode we want
9227a0bc89SDoug Rabson  * depp	     - returns the address of the gotten denode.
9327a0bc89SDoug Rabson  */
9427a0bc89SDoug Rabson int
95952a6212SJordan K. Hubbard deget(pmp, dirclust, diroffset, depp)
9627a0bc89SDoug Rabson 	struct msdosfsmount *pmp;	/* so we know the maj/min number */
9727a0bc89SDoug Rabson 	u_long dirclust;		/* cluster this dir entry came from */
9827a0bc89SDoug Rabson 	u_long diroffset;		/* index of entry within the cluster */
9927a0bc89SDoug Rabson 	struct denode **depp;		/* returns the addr of the gotten denode */
10027a0bc89SDoug Rabson {
10127a0bc89SDoug Rabson 	int error;
102f4b423aeSPoul-Henning Kamp 	uint64_t inode;
10327a0bc89SDoug Rabson 	struct mount *mntp = pmp->pm_mountp;
104952a6212SJordan K. Hubbard 	struct direntry *direntptr;
10527a0bc89SDoug Rabson 	struct denode *ldep;
106a30fc63bSPoul-Henning Kamp 	struct vnode *nvp, *xvp;
10727a0bc89SDoug Rabson 	struct buf *bp;
10827a0bc89SDoug Rabson 
10927a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
110952a6212SJordan K. Hubbard 	printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n",
111952a6212SJordan K. Hubbard 	    pmp, dirclust, diroffset, depp);
11227a0bc89SDoug Rabson #endif
11327a0bc89SDoug Rabson 
11427a0bc89SDoug Rabson 	/*
115952a6212SJordan K. Hubbard 	 * On FAT32 filesystems, root is a (more or less) normal
116952a6212SJordan K. Hubbard 	 * directory
11727a0bc89SDoug Rabson 	 */
118952a6212SJordan K. Hubbard 	if (FAT32(pmp) && dirclust == MSDOSFSROOT)
119952a6212SJordan K. Hubbard 		dirclust = pmp->pm_rootdirblk;
12027a0bc89SDoug Rabson 
12127a0bc89SDoug Rabson 	/*
12227a0bc89SDoug Rabson 	 * See if the denode is in the denode cache. Use the location of
12327a0bc89SDoug Rabson 	 * the directory entry to compute the hash value. For subdir use
124952a6212SJordan K. Hubbard 	 * address of "." entry. For root dir (if not FAT32) use cluster
125952a6212SJordan K. Hubbard 	 * MSDOSFSROOT, offset MSDOSFSROOT_OFS
12627a0bc89SDoug Rabson 	 *
12727a0bc89SDoug Rabson 	 * NOTE: The check for de_refcnt > 0 below insures the denode being
12827a0bc89SDoug Rabson 	 * examined does not represent an unlinked but still open file.
12927a0bc89SDoug Rabson 	 * These files are not to be accessible even when the directory
13027a0bc89SDoug Rabson 	 * entry that represented the file happens to be reused while the
13127a0bc89SDoug Rabson 	 * deleted file is still open.
13227a0bc89SDoug Rabson 	 */
1335ddf2985SDavid E. O'Brien 	inode = (uint64_t)pmp->pm_bpcluster * dirclust + diroffset;
134f4b423aeSPoul-Henning Kamp 
135f4b423aeSPoul-Henning Kamp 	error = vfs_hash_get(mntp, inode, LK_EXCLUSIVE, curthread, &nvp,
136f4b423aeSPoul-Henning Kamp 	    de_vncmpf, &inode);
137a30fc63bSPoul-Henning Kamp 	if (error)
138a30fc63bSPoul-Henning Kamp 		return (error);
139a30fc63bSPoul-Henning Kamp 	if (nvp != NULL) {
140a30fc63bSPoul-Henning Kamp 		*depp = VTODE(nvp);
141f4b423aeSPoul-Henning Kamp 		KASSERT((*depp)->de_dirclust == dirclust, ("wrong dirclust"));
142f4b423aeSPoul-Henning Kamp 		KASSERT((*depp)->de_diroffset == diroffset, ("wrong diroffset"));
143952a6212SJordan K. Hubbard 		return (0);
14427a0bc89SDoug Rabson 	}
14527a0bc89SDoug Rabson 
1462f9bae59SDavid Greenman 	/*
1478b36e813SKonstantin Belousov 	 * Do the malloc before the getnewvnode since doing so afterward
1482f9bae59SDavid Greenman 	 * might cause a bogus v_data pointer to get dereferenced
1492f9bae59SDavid Greenman 	 * elsewhere if MALLOC should block.
1502f9bae59SDavid Greenman 	 */
1518b36e813SKonstantin Belousov 	ldep = malloc(sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK | M_ZERO);
15227a0bc89SDoug Rabson 
15327a0bc89SDoug Rabson 	/*
15427a0bc89SDoug Rabson 	 * Directory entry was not in cache, have to create a vnode and
15527a0bc89SDoug Rabson 	 * copy it from the passed disk buffer.
15627a0bc89SDoug Rabson 	 */
15727a0bc89SDoug Rabson 	/* getnewvnode() does a VREF() on the vnode */
158aec0fb7bSPoul-Henning Kamp 	error = getnewvnode("msdosfs", mntp, &msdosfs_vnodeops, &nvp);
159c3c6d51eSPoul-Henning Kamp 	if (error) {
1602f9bae59SDavid Greenman 		*depp = NULL;
1611ede983cSDag-Erling Smørgrav 		free(ldep, M_MSDOSFSNODE);
16227a0bc89SDoug Rabson 		return error;
16327a0bc89SDoug Rabson 	}
16427a0bc89SDoug Rabson 	nvp->v_data = ldep;
16527a0bc89SDoug Rabson 	ldep->de_vnode = nvp;
16627a0bc89SDoug Rabson 	ldep->de_flag = 0;
16727a0bc89SDoug Rabson 	ldep->de_dirclust = dirclust;
16827a0bc89SDoug Rabson 	ldep->de_diroffset = diroffset;
169f4b423aeSPoul-Henning Kamp 	ldep->de_inode = inode;
17027a0bc89SDoug Rabson 	fc_purge(ldep, 0);	/* init the fat cache for this denode */
17127a0bc89SDoug Rabson 
1720e9eb108SAttilio Rao 	lockmgr(nvp->v_vnlock, LK_EXCLUSIVE, NULL);
17361b9d89fSTor Egge 	error = insmntque(nvp, mntp);
17461b9d89fSTor Egge 	if (error != 0) {
1751ede983cSDag-Erling Smørgrav 		free(ldep, M_MSDOSFSNODE);
17661b9d89fSTor Egge 		*depp = NULL;
17761b9d89fSTor Egge 		return (error);
17861b9d89fSTor Egge 	}
1790e9eb108SAttilio Rao 	error = vfs_hash_insert(nvp, inode, LK_EXCLUSIVE, curthread, &xvp,
180f4b423aeSPoul-Henning Kamp 	    de_vncmpf, &inode);
181a30fc63bSPoul-Henning Kamp 	if (error) {
182a30fc63bSPoul-Henning Kamp 		*depp = NULL;
183a30fc63bSPoul-Henning Kamp 		return (error);
184a30fc63bSPoul-Henning Kamp 	}
185a30fc63bSPoul-Henning Kamp 	if (xvp != NULL) {
186a30fc63bSPoul-Henning Kamp 		/* XXX: Not sure this is right */
187a30fc63bSPoul-Henning Kamp 		nvp = xvp;
188a30fc63bSPoul-Henning Kamp 		ldep->de_vnode = nvp;
189a30fc63bSPoul-Henning Kamp 	}
19027a0bc89SDoug Rabson 
191952a6212SJordan K. Hubbard 	ldep->de_pmp = pmp;
192952a6212SJordan K. Hubbard 	ldep->de_refcnt = 1;
19327a0bc89SDoug Rabson 	/*
19427a0bc89SDoug Rabson 	 * Copy the directory entry into the denode area of the vnode.
19527a0bc89SDoug Rabson 	 */
196952a6212SJordan K. Hubbard 	if ((dirclust == MSDOSFSROOT
197952a6212SJordan K. Hubbard 	     || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
198952a6212SJordan K. Hubbard 	    && diroffset == MSDOSFSROOT_OFS) {
19927a0bc89SDoug Rabson 		/*
20027a0bc89SDoug Rabson 		 * Directory entry for the root directory. There isn't one,
20127a0bc89SDoug Rabson 		 * so we manufacture one. We should probably rummage
20227a0bc89SDoug Rabson 		 * through the root directory and find a label entry (if it
20327a0bc89SDoug Rabson 		 * exists), and then use the time and date from that entry
20427a0bc89SDoug Rabson 		 * as the time and date for the root denode.
20527a0bc89SDoug Rabson 		 */
206e6e370a7SJeff Roberson 		nvp->v_vflag |= VV_ROOT; /* should be further down XXX */
207952a6212SJordan K. Hubbard 
20827a0bc89SDoug Rabson 		ldep->de_Attributes = ATTR_DIRECTORY;
209bad3d41dSDmitrij Tejblum 		ldep->de_LowerCase = 0;
210952a6212SJordan K. Hubbard 		if (FAT32(pmp))
211952a6212SJordan K. Hubbard 			ldep->de_StartCluster = pmp->pm_rootdirblk;
212952a6212SJordan K. Hubbard 			/* de_FileSize will be filled in further down */
213952a6212SJordan K. Hubbard 		else {
21427a0bc89SDoug Rabson 			ldep->de_StartCluster = MSDOSFSROOT;
21501f6cfbaSYoshihiro Takahashi 			ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE;
216952a6212SJordan K. Hubbard 		}
21727a0bc89SDoug Rabson 		/*
2183c960d93SPoul-Henning Kamp 		 * fill in time and date so that fattime2timespec() doesn't
21927a0bc89SDoug Rabson 		 * spit up when called from msdosfs_getattr() with root
22027a0bc89SDoug Rabson 		 * denode
22127a0bc89SDoug Rabson 		 */
222952a6212SJordan K. Hubbard 		ldep->de_CHun = 0;
223952a6212SJordan K. Hubbard 		ldep->de_CTime = 0x0000;	/* 00:00:00	 */
224952a6212SJordan K. Hubbard 		ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
22527a0bc89SDoug Rabson 		    | (1 << DD_DAY_SHIFT);
22627a0bc89SDoug Rabson 		/* Jan 1, 1980	 */
227952a6212SJordan K. Hubbard 		ldep->de_ADate = ldep->de_CDate;
228952a6212SJordan K. Hubbard 		ldep->de_MTime = ldep->de_CTime;
229952a6212SJordan K. Hubbard 		ldep->de_MDate = ldep->de_CDate;
23027a0bc89SDoug Rabson 		/* leave the other fields as garbage */
23127a0bc89SDoug Rabson 	} else {
232952a6212SJordan K. Hubbard 		error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
2335097a20dSBruce Evans 		if (error) {
2345097a20dSBruce Evans 			/*
2355097a20dSBruce Evans 			 * The denode does not contain anything useful, so
2365097a20dSBruce Evans 			 * it would be wrong to leave it on its hash chain.
2375097a20dSBruce Evans 			 * Arrange for vput() to just forget about it.
2385097a20dSBruce Evans 			 */
2395097a20dSBruce Evans 			ldep->de_Name[0] = SLOT_DELETED;
2405097a20dSBruce Evans 
2415097a20dSBruce Evans 			vput(nvp);
2425097a20dSBruce Evans 			*depp = NULL;
243952a6212SJordan K. Hubbard 			return (error);
2445097a20dSBruce Evans 		}
24527a0bc89SDoug Rabson 		DE_INTERNALIZE(ldep, direntptr);
24627a0bc89SDoug Rabson 		brelse(bp);
24727a0bc89SDoug Rabson 	}
24827a0bc89SDoug Rabson 
24927a0bc89SDoug Rabson 	/*
25027a0bc89SDoug Rabson 	 * Fill in a few fields of the vnode and finish filling in the
25127a0bc89SDoug Rabson 	 * denode.  Then return the address of the found denode.
25227a0bc89SDoug Rabson 	 */
25327a0bc89SDoug Rabson 	if (ldep->de_Attributes & ATTR_DIRECTORY) {
25427a0bc89SDoug Rabson 		/*
25527a0bc89SDoug Rabson 		 * Since DOS directory entries that describe directories
25627a0bc89SDoug Rabson 		 * have 0 in the filesize field, we take this opportunity
25727a0bc89SDoug Rabson 		 * to find out the length of the directory and plug it into
25827a0bc89SDoug Rabson 		 * the denode structure.
25927a0bc89SDoug Rabson 		 */
26027a0bc89SDoug Rabson 		u_long size;
26127a0bc89SDoug Rabson 
262b5cdbc6dSTom Rhodes 		/*
263e3117f85SBruce Evans 		 * XXX it sometimes happens that the "." entry has cluster
264e3117f85SBruce Evans 		 * number 0 when it shouldn't.  Use the actual cluster number
265b5cdbc6dSTom Rhodes 		 * instead of what is written in directory entry.
266b5cdbc6dSTom Rhodes 		 */
267e3117f85SBruce Evans 		if (diroffset == 0 && ldep->de_StartCluster != dirclust) {
268e3117f85SBruce Evans 			printf("deget(): \".\" entry at clust %lu != %lu\n",
269b5cdbc6dSTom Rhodes 			    dirclust, ldep->de_StartCluster);
270b5cdbc6dSTom Rhodes 			ldep->de_StartCluster = dirclust;
271b5cdbc6dSTom Rhodes 		}
272b5cdbc6dSTom Rhodes 
27327a0bc89SDoug Rabson 		nvp->v_type = VDIR;
274952a6212SJordan K. Hubbard 		if (ldep->de_StartCluster != MSDOSFSROOT) {
275952a6212SJordan K. Hubbard 			error = pcbmap(ldep, 0xffff, 0, &size, 0);
27627a0bc89SDoug Rabson 			if (error == E2BIG) {
277952a6212SJordan K. Hubbard 				ldep->de_FileSize = de_cn2off(pmp, size);
27827a0bc89SDoug Rabson 				error = 0;
27927a0bc89SDoug Rabson 			} else
28027a0bc89SDoug Rabson 				printf("deget(): pcbmap returned %d\n", error);
28127a0bc89SDoug Rabson 		}
28227a0bc89SDoug Rabson 	} else
28327a0bc89SDoug Rabson 		nvp->v_type = VREG;
2841affa3adSPoul-Henning Kamp 	ldep->de_modrev = init_va_filerev();
28527a0bc89SDoug Rabson 	*depp = ldep;
286952a6212SJordan K. Hubbard 	return (0);
28727a0bc89SDoug Rabson }
28827a0bc89SDoug Rabson 
28927a0bc89SDoug Rabson int
290952a6212SJordan K. Hubbard deupdat(dep, waitfor)
29127a0bc89SDoug Rabson 	struct denode *dep;
29227a0bc89SDoug Rabson 	int waitfor;
29327a0bc89SDoug Rabson {
29427a0bc89SDoug Rabson 	int error;
29527a0bc89SDoug Rabson 	struct buf *bp;
29627a0bc89SDoug Rabson 	struct direntry *dirp;
297952a6212SJordan K. Hubbard 	struct timespec ts;
29827a0bc89SDoug Rabson 
299952a6212SJordan K. Hubbard 	if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY)
300952a6212SJordan K. Hubbard 		return (0);
301a0502b19SPoul-Henning Kamp 	getnanotime(&ts);
302952a6212SJordan K. Hubbard 	DETIMES(dep, &ts, &ts, &ts);
303952a6212SJordan K. Hubbard 	if ((dep->de_flag & DE_MODIFIED) == 0)
304952a6212SJordan K. Hubbard 		return (0);
305952a6212SJordan K. Hubbard 	dep->de_flag &= ~DE_MODIFIED;
306952a6212SJordan K. Hubbard 	if (dep->de_Attributes & ATTR_DIRECTORY)
307952a6212SJordan K. Hubbard 		return (0);
308952a6212SJordan K. Hubbard 	if (dep->de_refcnt <= 0)
309952a6212SJordan K. Hubbard 		return (0);
310c3c6d51eSPoul-Henning Kamp 	error = readde(dep, &bp, &dirp);
311c3c6d51eSPoul-Henning Kamp 	if (error)
312952a6212SJordan K. Hubbard 		return (error);
31327a0bc89SDoug Rabson 	DE_EXTERNALIZE(dirp, dep);
31427a0bc89SDoug Rabson 	if (waitfor)
315952a6212SJordan K. Hubbard 		return (bwrite(bp));
316952a6212SJordan K. Hubbard 	else {
31727a0bc89SDoug Rabson 		bdwrite(bp);
318952a6212SJordan K. Hubbard 		return (0);
319952a6212SJordan K. Hubbard 	}
32027a0bc89SDoug Rabson }
32127a0bc89SDoug Rabson 
32227a0bc89SDoug Rabson /*
32327a0bc89SDoug Rabson  * Truncate the file described by dep to the length specified by length.
32427a0bc89SDoug Rabson  */
32527a0bc89SDoug Rabson int
326b40ce416SJulian Elischer detrunc(dep, length, flags, cred, td)
32727a0bc89SDoug Rabson 	struct denode *dep;
32827a0bc89SDoug Rabson 	u_long length;
32927a0bc89SDoug Rabson 	int flags;
33027a0bc89SDoug Rabson 	struct ucred *cred;
331b40ce416SJulian Elischer 	struct thread *td;
33227a0bc89SDoug Rabson {
33327a0bc89SDoug Rabson 	int error;
33427a0bc89SDoug Rabson 	int allerror;
33527a0bc89SDoug Rabson 	u_long eofentry;
33627a0bc89SDoug Rabson 	u_long chaintofree;
33727a0bc89SDoug Rabson 	daddr_t bn;
33827a0bc89SDoug Rabson 	int boff;
33927a0bc89SDoug Rabson 	int isadir = dep->de_Attributes & ATTR_DIRECTORY;
34027a0bc89SDoug Rabson 	struct buf *bp;
34127a0bc89SDoug Rabson 	struct msdosfsmount *pmp = dep->de_pmp;
34227a0bc89SDoug Rabson 
34327a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
344952a6212SJordan K. Hubbard 	printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
34527a0bc89SDoug Rabson #endif
34627a0bc89SDoug Rabson 
34727a0bc89SDoug Rabson 	/*
34827a0bc89SDoug Rabson 	 * Disallow attempts to truncate the root directory since it is of
34927a0bc89SDoug Rabson 	 * fixed size.  That's just the way dos filesystems are.  We use
35027a0bc89SDoug Rabson 	 * the VROOT bit in the vnode because checking for the directory
35127a0bc89SDoug Rabson 	 * bit and a startcluster of 0 in the denode is not adequate to
35227a0bc89SDoug Rabson 	 * recognize the root directory at this point in a file or
35327a0bc89SDoug Rabson 	 * directory's life.
35427a0bc89SDoug Rabson 	 */
355e6e370a7SJeff Roberson 	if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) {
356952a6212SJordan K. Hubbard 		printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
35727a0bc89SDoug Rabson 		    dep->de_dirclust, dep->de_diroffset);
358952a6212SJordan K. Hubbard 		return (EINVAL);
35927a0bc89SDoug Rabson 	}
36027a0bc89SDoug Rabson 
361bd7e5f99SJohn Dyson 	if (dep->de_FileSize < length) {
362bd7e5f99SJohn Dyson 		vnode_pager_setsize(DETOV(dep), length);
36327a0bc89SDoug Rabson 		return deextend(dep, length, cred);
364bd7e5f99SJohn Dyson 	}
36527a0bc89SDoug Rabson 
36627a0bc89SDoug Rabson 	/*
36727a0bc89SDoug Rabson 	 * If the desired length is 0 then remember the starting cluster of
36827a0bc89SDoug Rabson 	 * the file and set the StartCluster field in the directory entry
36927a0bc89SDoug Rabson 	 * to 0.  If the desired length is not zero, then get the number of
37027a0bc89SDoug Rabson 	 * the last cluster in the shortened file.  Then get the number of
37127a0bc89SDoug Rabson 	 * the first cluster in the part of the file that is to be freed.
37227a0bc89SDoug Rabson 	 * Then set the next cluster pointer in the last cluster of the
37327a0bc89SDoug Rabson 	 * file to CLUST_EOFE.
37427a0bc89SDoug Rabson 	 */
37527a0bc89SDoug Rabson 	if (length == 0) {
37627a0bc89SDoug Rabson 		chaintofree = dep->de_StartCluster;
37727a0bc89SDoug Rabson 		dep->de_StartCluster = 0;
37827a0bc89SDoug Rabson 		eofentry = ~0;
37927a0bc89SDoug Rabson 	} else {
380952a6212SJordan K. Hubbard 		error = pcbmap(dep, de_clcount(pmp, length) - 1, 0,
381952a6212SJordan K. Hubbard 			       &eofentry, 0);
382c3c6d51eSPoul-Henning Kamp 		if (error) {
38327a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
38427a0bc89SDoug Rabson 			printf("detrunc(): pcbmap fails %d\n", error);
38527a0bc89SDoug Rabson #endif
386952a6212SJordan K. Hubbard 			return (error);
38727a0bc89SDoug Rabson 		}
38827a0bc89SDoug Rabson 	}
38927a0bc89SDoug Rabson 
390952a6212SJordan K. Hubbard 	fc_purge(dep, de_clcount(pmp, length));
39127a0bc89SDoug Rabson 
39227a0bc89SDoug Rabson 	/*
39327a0bc89SDoug Rabson 	 * If the new length is not a multiple of the cluster size then we
39427a0bc89SDoug Rabson 	 * must zero the tail end of the new last cluster in case it
39527a0bc89SDoug Rabson 	 * becomes part of the file again because of a seek.
39627a0bc89SDoug Rabson 	 */
39727a0bc89SDoug Rabson 	if ((boff = length & pmp->pm_crbomask) != 0) {
39827a0bc89SDoug Rabson 		if (isadir) {
39927a0bc89SDoug Rabson 			bn = cntobn(pmp, eofentry);
40027a0bc89SDoug Rabson 			error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
40127a0bc89SDoug Rabson 			    NOCRED, &bp);
40227a0bc89SDoug Rabson 			if (error) {
403952a6212SJordan K. Hubbard 				brelse(bp);
40427a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
40527a0bc89SDoug Rabson 				printf("detrunc(): bread fails %d\n", error);
40627a0bc89SDoug Rabson #endif
407952a6212SJordan K. Hubbard 				return (error);
40827a0bc89SDoug Rabson 			}
40927a0bc89SDoug Rabson 			bzero(bp->b_data + boff, pmp->pm_bpcluster - boff);
41027a0bc89SDoug Rabson 			if (flags & IO_SYNC)
41127a0bc89SDoug Rabson 				bwrite(bp);
41227a0bc89SDoug Rabson 			else
41327a0bc89SDoug Rabson 				bdwrite(bp);
41427a0bc89SDoug Rabson 		}
415c2f95f66STom Rhodes 	}
41627a0bc89SDoug Rabson 
41727a0bc89SDoug Rabson 	/*
41827a0bc89SDoug Rabson 	 * Write out the updated directory entry.  Even if the update fails
41927a0bc89SDoug Rabson 	 * we free the trailing clusters.
42027a0bc89SDoug Rabson 	 */
42127a0bc89SDoug Rabson 	dep->de_FileSize = length;
422952a6212SJordan K. Hubbard 	if (!isadir)
423952a6212SJordan K. Hubbard 		dep->de_flag |= DE_UPDATE | DE_MODIFIED;
424b40ce416SJulian Elischer 	allerror = vtruncbuf(DETOV(dep), cred, td, length, pmp->pm_bpcluster);
42544fdad99SPeter Wemm #ifdef MSDOSFS_DEBUG
42644fdad99SPeter Wemm 	if (allerror)
42744fdad99SPeter Wemm 		printf("detrunc(): vtruncbuf error %d\n", allerror);
42844fdad99SPeter Wemm #endif
429cb65c1eeSBruce Evans 	error = deupdat(dep, !(DETOV(dep)->v_mount->mnt_flag & MNT_ASYNC));
430e3117f85SBruce Evans 	if (error != 0 && allerror == 0)
43144fdad99SPeter Wemm 		allerror = error;
43227a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
433952a6212SJordan K. Hubbard 	printf("detrunc(): allerror %d, eofentry %lu\n",
43427a0bc89SDoug Rabson 	       allerror, eofentry);
43527a0bc89SDoug Rabson #endif
43627a0bc89SDoug Rabson 
43727a0bc89SDoug Rabson 	/*
43827a0bc89SDoug Rabson 	 * If we need to break the cluster chain for the file then do it
43927a0bc89SDoug Rabson 	 * now.
44027a0bc89SDoug Rabson 	 */
44127a0bc89SDoug Rabson 	if (eofentry != ~0) {
44227a0bc89SDoug Rabson 		error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
44327a0bc89SDoug Rabson 				 &chaintofree, CLUST_EOFE);
44427a0bc89SDoug Rabson 		if (error) {
44527a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
44627a0bc89SDoug Rabson 			printf("detrunc(): fatentry errors %d\n", error);
44727a0bc89SDoug Rabson #endif
448952a6212SJordan K. Hubbard 			return (error);
44927a0bc89SDoug Rabson 		}
450952a6212SJordan K. Hubbard 		fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
45127a0bc89SDoug Rabson 			    eofentry);
45227a0bc89SDoug Rabson 	}
45327a0bc89SDoug Rabson 
45427a0bc89SDoug Rabson 	/*
45527a0bc89SDoug Rabson 	 * Now free the clusters removed from the file because of the
45627a0bc89SDoug Rabson 	 * truncation.
45727a0bc89SDoug Rabson 	 */
458952a6212SJordan K. Hubbard 	if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree))
45927a0bc89SDoug Rabson 		freeclusterchain(pmp, chaintofree);
46027a0bc89SDoug Rabson 
461952a6212SJordan K. Hubbard 	return (allerror);
46227a0bc89SDoug Rabson }
46327a0bc89SDoug Rabson 
46427a0bc89SDoug Rabson /*
46527a0bc89SDoug Rabson  * Extend the file described by dep to length specified by length.
46627a0bc89SDoug Rabson  */
46727a0bc89SDoug Rabson int
46827a0bc89SDoug Rabson deextend(dep, length, cred)
46927a0bc89SDoug Rabson 	struct denode *dep;
470952a6212SJordan K. Hubbard 	u_long length;
47127a0bc89SDoug Rabson 	struct ucred *cred;
47227a0bc89SDoug Rabson {
47327a0bc89SDoug Rabson 	struct msdosfsmount *pmp = dep->de_pmp;
47427a0bc89SDoug Rabson 	u_long count;
47527a0bc89SDoug Rabson 	int error;
47627a0bc89SDoug Rabson 
47727a0bc89SDoug Rabson 	/*
47827a0bc89SDoug Rabson 	 * The root of a DOS filesystem cannot be extended.
47927a0bc89SDoug Rabson 	 */
480e6e370a7SJeff Roberson 	if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp))
481952a6212SJordan K. Hubbard 		return (EINVAL);
48227a0bc89SDoug Rabson 
48327a0bc89SDoug Rabson 	/*
484952a6212SJordan K. Hubbard 	 * Directories cannot be extended.
48527a0bc89SDoug Rabson 	 */
486952a6212SJordan K. Hubbard 	if (dep->de_Attributes & ATTR_DIRECTORY)
487952a6212SJordan K. Hubbard 		return (EISDIR);
48827a0bc89SDoug Rabson 
48927a0bc89SDoug Rabson 	if (length <= dep->de_FileSize)
49027a0bc89SDoug Rabson 		panic("deextend: file too large");
49127a0bc89SDoug Rabson 
49227a0bc89SDoug Rabson 	/*
49327a0bc89SDoug Rabson 	 * Compute the number of clusters to allocate.
49427a0bc89SDoug Rabson 	 */
49527a0bc89SDoug Rabson 	count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
49627a0bc89SDoug Rabson 	if (count > 0) {
49727a0bc89SDoug Rabson 		if (count > pmp->pm_freeclustercount)
498952a6212SJordan K. Hubbard 			return (ENOSPC);
499c3c6d51eSPoul-Henning Kamp 		error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
500c3c6d51eSPoul-Henning Kamp 		if (error) {
50127a0bc89SDoug Rabson 			/* truncate the added clusters away again */
50227a0bc89SDoug Rabson 			(void) detrunc(dep, dep->de_FileSize, 0, cred, NULL);
503952a6212SJordan K. Hubbard 			return (error);
50427a0bc89SDoug Rabson 		}
50527a0bc89SDoug Rabson 	}
50627a0bc89SDoug Rabson 	dep->de_FileSize = length;
507952a6212SJordan K. Hubbard 	dep->de_flag |= DE_UPDATE | DE_MODIFIED;
508cb65c1eeSBruce Evans 	return (deupdat(dep, !(DETOV(dep)->v_mount->mnt_flag & MNT_ASYNC)));
50927a0bc89SDoug Rabson }
51027a0bc89SDoug Rabson 
51127a0bc89SDoug Rabson /*
51227a0bc89SDoug Rabson  * Move a denode to its correct hash queue after the file it represents has
51327a0bc89SDoug Rabson  * been moved to a new directory.
51427a0bc89SDoug Rabson  */
515952a6212SJordan K. Hubbard void
516952a6212SJordan K. Hubbard reinsert(dep)
51727a0bc89SDoug Rabson 	struct denode *dep;
51827a0bc89SDoug Rabson {
519a30fc63bSPoul-Henning Kamp 	struct vnode *vp;
520a30fc63bSPoul-Henning Kamp 
52127a0bc89SDoug Rabson 	/*
52227a0bc89SDoug Rabson 	 * Fix up the denode cache.  If the denode is for a directory,
52327a0bc89SDoug Rabson 	 * there is nothing to do since the hash is based on the starting
52427a0bc89SDoug Rabson 	 * cluster of the directory file and that hasn't changed.  If for a
52527a0bc89SDoug Rabson 	 * file the hash is based on the location of the directory entry,
52627a0bc89SDoug Rabson 	 * so we must remove it from the cache and re-enter it with the
52727a0bc89SDoug Rabson 	 * hash based on the new location of the directory entry.
52827a0bc89SDoug Rabson 	 */
529f4b423aeSPoul-Henning Kamp #if 0
530952a6212SJordan K. Hubbard 	if (dep->de_Attributes & ATTR_DIRECTORY)
531952a6212SJordan K. Hubbard 		return;
532f4b423aeSPoul-Henning Kamp #endif
533a30fc63bSPoul-Henning Kamp 	vp = DETOV(dep);
5345ddf2985SDavid E. O'Brien 	dep->de_inode = (uint64_t)dep->de_pmp->pm_bpcluster * dep->de_dirclust +
535f4b423aeSPoul-Henning Kamp 	    dep->de_diroffset;
536f4b423aeSPoul-Henning Kamp 	vfs_hash_rehash(vp, dep->de_inode);
53727a0bc89SDoug Rabson }
53827a0bc89SDoug Rabson 
53927a0bc89SDoug Rabson int
54027a0bc89SDoug Rabson msdosfs_reclaim(ap)
54127a0bc89SDoug Rabson 	struct vop_reclaim_args /* {
54227a0bc89SDoug Rabson 		struct vnode *a_vp;
54327a0bc89SDoug Rabson 	} */ *ap;
54427a0bc89SDoug Rabson {
54527a0bc89SDoug Rabson 	struct vnode *vp = ap->a_vp;
54627a0bc89SDoug Rabson 	struct denode *dep = VTODE(vp);
54727a0bc89SDoug Rabson 
54827a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
549f0707215SPoul-Henning Kamp 	printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
55027a0bc89SDoug Rabson 	    dep, dep->de_Name, dep->de_refcnt);
55127a0bc89SDoug Rabson #endif
55227a0bc89SDoug Rabson 
5534d93c0beSJeff Roberson 	if (prtactive && vrefcnt(vp) != 0)
55427a0bc89SDoug Rabson 		vprint("msdosfs_reclaim(): pushing active", vp);
55527a0bc89SDoug Rabson 	/*
55692e73f57SAlfred Perlstein 	 * Destroy the vm object and flush associated pages.
55792e73f57SAlfred Perlstein 	 */
55892e73f57SAlfred Perlstein 	vnode_destroy_vobject(vp);
55992e73f57SAlfred Perlstein 	/*
560952a6212SJordan K. Hubbard 	 * Remove the denode from its hash chain.
56127a0bc89SDoug Rabson 	 */
562a30fc63bSPoul-Henning Kamp 	vfs_hash_remove(vp);
56327a0bc89SDoug Rabson 	/*
564952a6212SJordan K. Hubbard 	 * Purge old data structures associated with the denode.
56527a0bc89SDoug Rabson 	 */
566952a6212SJordan K. Hubbard #if 0 /* XXX */
56727a0bc89SDoug Rabson 	dep->de_flag = 0;
568952a6212SJordan K. Hubbard #endif
5691ede983cSDag-Erling Smørgrav 	free(dep, M_MSDOSFSNODE);
57027a0bc89SDoug Rabson 	vp->v_data = NULL;
57127a0bc89SDoug Rabson 
572952a6212SJordan K. Hubbard 	return (0);
57327a0bc89SDoug Rabson }
57427a0bc89SDoug Rabson 
57527a0bc89SDoug Rabson int
57627a0bc89SDoug Rabson msdosfs_inactive(ap)
57727a0bc89SDoug Rabson 	struct vop_inactive_args /* {
57827a0bc89SDoug Rabson 		struct vnode *a_vp;
579b40ce416SJulian Elischer 		struct thread *a_td;
58027a0bc89SDoug Rabson 	} */ *ap;
58127a0bc89SDoug Rabson {
58227a0bc89SDoug Rabson 	struct vnode *vp = ap->a_vp;
58327a0bc89SDoug Rabson 	struct denode *dep = VTODE(vp);
584b40ce416SJulian Elischer 	struct thread *td = ap->a_td;
58527a0bc89SDoug Rabson 	int error = 0;
58627a0bc89SDoug Rabson 
58727a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
588f0707215SPoul-Henning Kamp 	printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
58927a0bc89SDoug Rabson #endif
59027a0bc89SDoug Rabson 
5914d93c0beSJeff Roberson 	if (prtactive && vrefcnt(vp) != 0)
59227a0bc89SDoug Rabson 		vprint("msdosfs_inactive(): pushing active", vp);
59327a0bc89SDoug Rabson 
59427a0bc89SDoug Rabson 	/*
595952a6212SJordan K. Hubbard 	 * Ignore denodes related to stale file handles.
59627a0bc89SDoug Rabson 	 */
597af3f60d5SBruce Evans 	if (dep->de_Name[0] == SLOT_DELETED)
598af3f60d5SBruce Evans 		goto out;
59927a0bc89SDoug Rabson 
60027a0bc89SDoug Rabson 	/*
60127a0bc89SDoug Rabson 	 * If the file has been deleted and it is on a read/write
60227a0bc89SDoug Rabson 	 * filesystem, then truncate the file, and mark the directory slot
60327a0bc89SDoug Rabson 	 * as empty.  (This may not be necessary for the dos filesystem.)
60427a0bc89SDoug Rabson 	 */
60527a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
606f0707215SPoul-Henning Kamp 	printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n",
60727a0bc89SDoug Rabson 	       dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY);
60827a0bc89SDoug Rabson #endif
60927a0bc89SDoug Rabson 	if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
610b40ce416SJulian Elischer 		error = detrunc(dep, (u_long) 0, 0, NOCRED, td);
61127a0bc89SDoug Rabson 		dep->de_flag |= DE_UPDATE;
61227a0bc89SDoug Rabson 		dep->de_Name[0] = SLOT_DELETED;
61327a0bc89SDoug Rabson 	}
614952a6212SJordan K. Hubbard 	deupdat(dep, 0);
615952a6212SJordan K. Hubbard 
616af3f60d5SBruce Evans out:
61727a0bc89SDoug Rabson 	/*
618952a6212SJordan K. Hubbard 	 * If we are done with the denode, reclaim it
619952a6212SJordan K. Hubbard 	 * so that it can be reused immediately.
62027a0bc89SDoug Rabson 	 */
62127a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
6224d93c0beSJeff Roberson 	printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n",
6234d93c0beSJeff Roberson 	       vrefcnt(vp), dep->de_Name[0]);
62427a0bc89SDoug Rabson #endif
625af3f60d5SBruce Evans 	if (dep->de_Name[0] == SLOT_DELETED)
626d4eb29baSPoul-Henning Kamp 		vrecycle(vp, td);
627952a6212SJordan K. Hubbard 	return (error);
62827a0bc89SDoug Rabson }
629