xref: /freebsd/sys/fs/msdosfs/msdosfs_denode.c (revision 9287dbaae93fa66cf9c61e6e1a15c703d5eec27c)
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>
589ed01c32SGleb Smirnoff #include <sys/vmmeter.h>
5927a0bc89SDoug Rabson #include <sys/vnode.h>
6027a0bc89SDoug Rabson 
61c3c6d51eSPoul-Henning Kamp #include <vm/vm.h>
62efeaf95aSDavid Greenman #include <vm/vm_extern.h>
63c3c6d51eSPoul-Henning Kamp 
641166fb51SRuslan Ermilov #include <fs/msdosfs/bpb.h>
651166fb51SRuslan Ermilov #include <fs/msdosfs/direntry.h>
661166fb51SRuslan Ermilov #include <fs/msdosfs/denode.h>
671166fb51SRuslan Ermilov #include <fs/msdosfs/fat.h>
68a878a31cSBruce Evans #include <fs/msdosfs/msdosfsmount.h>
6927a0bc89SDoug Rabson 
705bb84bc8SRobert Watson static MALLOC_DEFINE(M_MSDOSFSNODE, "msdosfs_node", "MSDOSFS vnode private part");
7155166637SPoul-Henning Kamp 
72f4b423aeSPoul-Henning Kamp static int
73f4b423aeSPoul-Henning Kamp de_vncmpf(struct vnode *vp, void *arg)
74f4b423aeSPoul-Henning Kamp {
75f4b423aeSPoul-Henning Kamp 	struct denode *de;
76f4b423aeSPoul-Henning Kamp 	uint64_t *a;
77f4b423aeSPoul-Henning Kamp 
78f4b423aeSPoul-Henning Kamp 	a = arg;
79f4b423aeSPoul-Henning Kamp 	de = VTODE(vp);
80f4b423aeSPoul-Henning Kamp 	return (de->de_inode != *a);
81f4b423aeSPoul-Henning Kamp }
8227a0bc89SDoug Rabson 
8327a0bc89SDoug Rabson /*
8427a0bc89SDoug Rabson  * If deget() succeeds it returns with the gotten denode locked().
8527a0bc89SDoug Rabson  *
8627a0bc89SDoug Rabson  * pmp	     - address of msdosfsmount structure of the filesystem containing
873b97f388SPoul-Henning Kamp  *	       the denode of interest.  The address of
8827a0bc89SDoug Rabson  *	       the msdosfsmount structure are used.
8927a0bc89SDoug Rabson  * dirclust  - which cluster bp contains, if dirclust is 0 (root directory)
9027a0bc89SDoug Rabson  *	       diroffset is relative to the beginning of the root directory,
9127a0bc89SDoug Rabson  *	       otherwise it is cluster relative.
9227a0bc89SDoug Rabson  * diroffset - offset past begin of cluster of denode we want
9327a0bc89SDoug Rabson  * depp	     - returns the address of the gotten denode.
9427a0bc89SDoug Rabson  */
9527a0bc89SDoug Rabson int
9610c9700fSEd Maste deget(struct msdosfsmount *pmp, u_long dirclust, u_long diroffset,
9710c9700fSEd Maste     struct denode **depp)
9827a0bc89SDoug Rabson {
9927a0bc89SDoug Rabson 	int error;
100f4b423aeSPoul-Henning Kamp 	uint64_t inode;
10127a0bc89SDoug Rabson 	struct mount *mntp = pmp->pm_mountp;
102952a6212SJordan K. Hubbard 	struct direntry *direntptr;
10327a0bc89SDoug Rabson 	struct denode *ldep;
104a30fc63bSPoul-Henning Kamp 	struct vnode *nvp, *xvp;
10527a0bc89SDoug Rabson 	struct buf *bp;
10627a0bc89SDoug Rabson 
10727a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
108952a6212SJordan K. Hubbard 	printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n",
109952a6212SJordan K. Hubbard 	    pmp, dirclust, diroffset, depp);
11027a0bc89SDoug Rabson #endif
11127a0bc89SDoug Rabson 
11227a0bc89SDoug Rabson 	/*
113952a6212SJordan K. Hubbard 	 * On FAT32 filesystems, root is a (more or less) normal
114952a6212SJordan K. Hubbard 	 * directory
11527a0bc89SDoug Rabson 	 */
116952a6212SJordan K. Hubbard 	if (FAT32(pmp) && dirclust == MSDOSFSROOT)
117952a6212SJordan K. Hubbard 		dirclust = pmp->pm_rootdirblk;
11827a0bc89SDoug Rabson 
11927a0bc89SDoug Rabson 	/*
12027a0bc89SDoug Rabson 	 * See if the denode is in the denode cache. Use the location of
12127a0bc89SDoug Rabson 	 * the directory entry to compute the hash value. For subdir use
122952a6212SJordan K. Hubbard 	 * address of "." entry. For root dir (if not FAT32) use cluster
123952a6212SJordan K. Hubbard 	 * MSDOSFSROOT, offset MSDOSFSROOT_OFS
12427a0bc89SDoug Rabson 	 *
12527a0bc89SDoug Rabson 	 * NOTE: The check for de_refcnt > 0 below insures the denode being
12627a0bc89SDoug Rabson 	 * examined does not represent an unlinked but still open file.
12727a0bc89SDoug Rabson 	 * These files are not to be accessible even when the directory
12827a0bc89SDoug Rabson 	 * entry that represented the file happens to be reused while the
12927a0bc89SDoug Rabson 	 * deleted file is still open.
13027a0bc89SDoug Rabson 	 */
1315ddf2985SDavid E. O'Brien 	inode = (uint64_t)pmp->pm_bpcluster * dirclust + diroffset;
132f4b423aeSPoul-Henning Kamp 
133f4b423aeSPoul-Henning Kamp 	error = vfs_hash_get(mntp, inode, LK_EXCLUSIVE, curthread, &nvp,
134f4b423aeSPoul-Henning Kamp 	    de_vncmpf, &inode);
135a30fc63bSPoul-Henning Kamp 	if (error)
136a30fc63bSPoul-Henning Kamp 		return (error);
137a30fc63bSPoul-Henning Kamp 	if (nvp != NULL) {
138a30fc63bSPoul-Henning Kamp 		*depp = VTODE(nvp);
139f4b423aeSPoul-Henning Kamp 		KASSERT((*depp)->de_dirclust == dirclust, ("wrong dirclust"));
140f4b423aeSPoul-Henning Kamp 		KASSERT((*depp)->de_diroffset == diroffset, ("wrong diroffset"));
141952a6212SJordan K. Hubbard 		return (0);
14227a0bc89SDoug Rabson 	}
1438b36e813SKonstantin Belousov 	ldep = malloc(sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK | M_ZERO);
14427a0bc89SDoug Rabson 
14527a0bc89SDoug Rabson 	/*
14627a0bc89SDoug Rabson 	 * Directory entry was not in cache, have to create a vnode and
14727a0bc89SDoug Rabson 	 * copy it from the passed disk buffer.
14827a0bc89SDoug Rabson 	 */
14927a0bc89SDoug Rabson 	/* getnewvnode() does a VREF() on the vnode */
150aec0fb7bSPoul-Henning Kamp 	error = getnewvnode("msdosfs", mntp, &msdosfs_vnodeops, &nvp);
151c3c6d51eSPoul-Henning Kamp 	if (error) {
1522f9bae59SDavid Greenman 		*depp = NULL;
1531ede983cSDag-Erling Smørgrav 		free(ldep, M_MSDOSFSNODE);
15427a0bc89SDoug Rabson 		return error;
15527a0bc89SDoug Rabson 	}
15627a0bc89SDoug Rabson 	nvp->v_data = ldep;
15727a0bc89SDoug Rabson 	ldep->de_vnode = nvp;
15827a0bc89SDoug Rabson 	ldep->de_flag = 0;
15927a0bc89SDoug Rabson 	ldep->de_dirclust = dirclust;
16027a0bc89SDoug Rabson 	ldep->de_diroffset = diroffset;
161f4b423aeSPoul-Henning Kamp 	ldep->de_inode = inode;
1620e9eb108SAttilio Rao 	lockmgr(nvp->v_vnlock, LK_EXCLUSIVE, NULL);
163*9287dbaaSEd Maste 	fc_purge(ldep, 0);	/* init the FAT cache for this denode */
16461b9d89fSTor Egge 	error = insmntque(nvp, mntp);
16561b9d89fSTor Egge 	if (error != 0) {
1661ede983cSDag-Erling Smørgrav 		free(ldep, M_MSDOSFSNODE);
16761b9d89fSTor Egge 		*depp = NULL;
16861b9d89fSTor Egge 		return (error);
16961b9d89fSTor Egge 	}
1700e9eb108SAttilio Rao 	error = vfs_hash_insert(nvp, inode, LK_EXCLUSIVE, curthread, &xvp,
171f4b423aeSPoul-Henning Kamp 	    de_vncmpf, &inode);
172a30fc63bSPoul-Henning Kamp 	if (error) {
173a30fc63bSPoul-Henning Kamp 		*depp = NULL;
174a30fc63bSPoul-Henning Kamp 		return (error);
175a30fc63bSPoul-Henning Kamp 	}
176a30fc63bSPoul-Henning Kamp 	if (xvp != NULL) {
1770bdbd627SKonstantin Belousov 		*depp = xvp->v_data;
1780bdbd627SKonstantin Belousov 		return (0);
179a30fc63bSPoul-Henning Kamp 	}
18027a0bc89SDoug Rabson 
181952a6212SJordan K. Hubbard 	ldep->de_pmp = pmp;
182952a6212SJordan K. Hubbard 	ldep->de_refcnt = 1;
18327a0bc89SDoug Rabson 	/*
18427a0bc89SDoug Rabson 	 * Copy the directory entry into the denode area of the vnode.
18527a0bc89SDoug Rabson 	 */
186952a6212SJordan K. Hubbard 	if ((dirclust == MSDOSFSROOT
187952a6212SJordan K. Hubbard 	     || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
188952a6212SJordan K. Hubbard 	    && diroffset == MSDOSFSROOT_OFS) {
18927a0bc89SDoug Rabson 		/*
19027a0bc89SDoug Rabson 		 * Directory entry for the root directory. There isn't one,
19127a0bc89SDoug Rabson 		 * so we manufacture one. We should probably rummage
19227a0bc89SDoug Rabson 		 * through the root directory and find a label entry (if it
19327a0bc89SDoug Rabson 		 * exists), and then use the time and date from that entry
19427a0bc89SDoug Rabson 		 * as the time and date for the root denode.
19527a0bc89SDoug Rabson 		 */
196e6e370a7SJeff Roberson 		nvp->v_vflag |= VV_ROOT; /* should be further down XXX */
197952a6212SJordan K. Hubbard 
19827a0bc89SDoug Rabson 		ldep->de_Attributes = ATTR_DIRECTORY;
199bad3d41dSDmitrij Tejblum 		ldep->de_LowerCase = 0;
200952a6212SJordan K. Hubbard 		if (FAT32(pmp))
201952a6212SJordan K. Hubbard 			ldep->de_StartCluster = pmp->pm_rootdirblk;
202952a6212SJordan K. Hubbard 			/* de_FileSize will be filled in further down */
203952a6212SJordan K. Hubbard 		else {
20427a0bc89SDoug Rabson 			ldep->de_StartCluster = MSDOSFSROOT;
20501f6cfbaSYoshihiro Takahashi 			ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE;
206952a6212SJordan K. Hubbard 		}
20727a0bc89SDoug Rabson 		/*
2083c960d93SPoul-Henning Kamp 		 * fill in time and date so that fattime2timespec() doesn't
20927a0bc89SDoug Rabson 		 * spit up when called from msdosfs_getattr() with root
21027a0bc89SDoug Rabson 		 * denode
21127a0bc89SDoug Rabson 		 */
212952a6212SJordan K. Hubbard 		ldep->de_CHun = 0;
213952a6212SJordan K. Hubbard 		ldep->de_CTime = 0x0000;	/* 00:00:00	 */
214952a6212SJordan K. Hubbard 		ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
21527a0bc89SDoug Rabson 		    | (1 << DD_DAY_SHIFT);
21627a0bc89SDoug Rabson 		/* Jan 1, 1980	 */
217952a6212SJordan K. Hubbard 		ldep->de_ADate = ldep->de_CDate;
218952a6212SJordan K. Hubbard 		ldep->de_MTime = ldep->de_CTime;
219952a6212SJordan K. Hubbard 		ldep->de_MDate = ldep->de_CDate;
22027a0bc89SDoug Rabson 		/* leave the other fields as garbage */
22127a0bc89SDoug Rabson 	} else {
222952a6212SJordan K. Hubbard 		error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
2235097a20dSBruce Evans 		if (error) {
2245097a20dSBruce Evans 			/*
2255097a20dSBruce Evans 			 * The denode does not contain anything useful, so
2265097a20dSBruce Evans 			 * it would be wrong to leave it on its hash chain.
2275097a20dSBruce Evans 			 * Arrange for vput() to just forget about it.
2285097a20dSBruce Evans 			 */
2295097a20dSBruce Evans 			ldep->de_Name[0] = SLOT_DELETED;
2305097a20dSBruce Evans 
2315097a20dSBruce Evans 			vput(nvp);
2325097a20dSBruce Evans 			*depp = NULL;
233952a6212SJordan K. Hubbard 			return (error);
2345097a20dSBruce Evans 		}
2350b53cc9fSRui Paulo 		(void)DE_INTERNALIZE(ldep, direntptr);
23627a0bc89SDoug Rabson 		brelse(bp);
23727a0bc89SDoug Rabson 	}
23827a0bc89SDoug Rabson 
23927a0bc89SDoug Rabson 	/*
24027a0bc89SDoug Rabson 	 * Fill in a few fields of the vnode and finish filling in the
24127a0bc89SDoug Rabson 	 * denode.  Then return the address of the found denode.
24227a0bc89SDoug Rabson 	 */
24327a0bc89SDoug Rabson 	if (ldep->de_Attributes & ATTR_DIRECTORY) {
24427a0bc89SDoug Rabson 		/*
24527a0bc89SDoug Rabson 		 * Since DOS directory entries that describe directories
24627a0bc89SDoug Rabson 		 * have 0 in the filesize field, we take this opportunity
24727a0bc89SDoug Rabson 		 * to find out the length of the directory and plug it into
24827a0bc89SDoug Rabson 		 * the denode structure.
24927a0bc89SDoug Rabson 		 */
25027a0bc89SDoug Rabson 		u_long size;
25127a0bc89SDoug Rabson 
252b5cdbc6dSTom Rhodes 		/*
253e3117f85SBruce Evans 		 * XXX it sometimes happens that the "." entry has cluster
254e3117f85SBruce Evans 		 * number 0 when it shouldn't.  Use the actual cluster number
255b5cdbc6dSTom Rhodes 		 * instead of what is written in directory entry.
256b5cdbc6dSTom Rhodes 		 */
257e3117f85SBruce Evans 		if (diroffset == 0 && ldep->de_StartCluster != dirclust) {
25854cf9198SKonstantin Belousov #ifdef MSDOSFS_DEBUG
259e3117f85SBruce Evans 			printf("deget(): \".\" entry at clust %lu != %lu\n",
260b5cdbc6dSTom Rhodes 			    dirclust, ldep->de_StartCluster);
26154cf9198SKonstantin Belousov #endif
262b5cdbc6dSTom Rhodes 			ldep->de_StartCluster = dirclust;
263b5cdbc6dSTom Rhodes 		}
264b5cdbc6dSTom Rhodes 
26527a0bc89SDoug Rabson 		nvp->v_type = VDIR;
266952a6212SJordan K. Hubbard 		if (ldep->de_StartCluster != MSDOSFSROOT) {
267952a6212SJordan K. Hubbard 			error = pcbmap(ldep, 0xffff, 0, &size, 0);
26827a0bc89SDoug Rabson 			if (error == E2BIG) {
269952a6212SJordan K. Hubbard 				ldep->de_FileSize = de_cn2off(pmp, size);
27027a0bc89SDoug Rabson 				error = 0;
27154cf9198SKonstantin Belousov 			} else {
27254cf9198SKonstantin Belousov #ifdef MSDOSFS_DEBUG
27327a0bc89SDoug Rabson 				printf("deget(): pcbmap returned %d\n", error);
27454cf9198SKonstantin Belousov #endif
27554cf9198SKonstantin Belousov 			}
27627a0bc89SDoug Rabson 		}
27727a0bc89SDoug Rabson 	} else
27827a0bc89SDoug Rabson 		nvp->v_type = VREG;
2791affa3adSPoul-Henning Kamp 	ldep->de_modrev = init_va_filerev();
28027a0bc89SDoug Rabson 	*depp = ldep;
281952a6212SJordan K. Hubbard 	return (0);
28227a0bc89SDoug Rabson }
28327a0bc89SDoug Rabson 
28427a0bc89SDoug Rabson int
28510c9700fSEd Maste deupdat(struct denode *dep, int waitfor)
28627a0bc89SDoug Rabson {
287293e4eb6SKonstantin Belousov 	struct direntry dir;
288293e4eb6SKonstantin Belousov 	struct timespec ts;
28927a0bc89SDoug Rabson 	struct buf *bp;
29027a0bc89SDoug Rabson 	struct direntry *dirp;
291293e4eb6SKonstantin Belousov 	int error;
29227a0bc89SDoug Rabson 
293293e4eb6SKonstantin Belousov 	if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY) {
294293e4eb6SKonstantin Belousov 		dep->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS |
295293e4eb6SKonstantin Belousov 		    DE_MODIFIED);
296952a6212SJordan K. Hubbard 		return (0);
297293e4eb6SKonstantin Belousov 	}
298a0502b19SPoul-Henning Kamp 	getnanotime(&ts);
299952a6212SJordan K. Hubbard 	DETIMES(dep, &ts, &ts, &ts);
300293e4eb6SKonstantin Belousov 	if ((dep->de_flag & DE_MODIFIED) == 0 && waitfor == 0)
301952a6212SJordan K. Hubbard 		return (0);
302952a6212SJordan K. Hubbard 	dep->de_flag &= ~DE_MODIFIED;
3037da1a731SKenneth D. Merry 	if (DETOV(dep)->v_vflag & VV_ROOT)
3047da1a731SKenneth D. Merry 		return (EINVAL);
305952a6212SJordan K. Hubbard 	if (dep->de_refcnt <= 0)
306952a6212SJordan K. Hubbard 		return (0);
307c3c6d51eSPoul-Henning Kamp 	error = readde(dep, &bp, &dirp);
308c3c6d51eSPoul-Henning Kamp 	if (error)
309952a6212SJordan K. Hubbard 		return (error);
310293e4eb6SKonstantin Belousov 	DE_EXTERNALIZE(&dir, dep);
311293e4eb6SKonstantin Belousov 	if (bcmp(dirp, &dir, sizeof(dir)) == 0) {
312293e4eb6SKonstantin Belousov 		if (waitfor == 0 || (bp->b_flags & B_DELWRI) == 0) {
313293e4eb6SKonstantin Belousov 			brelse(bp);
314952a6212SJordan K. Hubbard 			return (0);
315952a6212SJordan K. Hubbard 		}
316293e4eb6SKonstantin Belousov 	} else
317293e4eb6SKonstantin Belousov 		*dirp = dir;
318293e4eb6SKonstantin Belousov 	if ((DETOV(dep)->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
319293e4eb6SKonstantin Belousov 		bp->b_flags |= B_CLUSTEROK;
320293e4eb6SKonstantin Belousov 	if (waitfor)
321293e4eb6SKonstantin Belousov 		error = bwrite(bp);
322293e4eb6SKonstantin Belousov 	else if (vm_page_count_severe() || buf_dirty_count_severe())
323293e4eb6SKonstantin Belousov 		bawrite(bp);
324293e4eb6SKonstantin Belousov 	else
325293e4eb6SKonstantin Belousov 		bdwrite(bp);
326293e4eb6SKonstantin Belousov 	return (error);
32727a0bc89SDoug Rabson }
32827a0bc89SDoug Rabson 
32927a0bc89SDoug Rabson /*
33027a0bc89SDoug Rabson  * Truncate the file described by dep to the length specified by length.
33127a0bc89SDoug Rabson  */
33227a0bc89SDoug Rabson int
33310c9700fSEd Maste detrunc(struct denode *dep, u_long length, int flags, struct ucred *cred)
33427a0bc89SDoug Rabson {
33527a0bc89SDoug Rabson 	int error;
33627a0bc89SDoug Rabson 	int allerror;
33727a0bc89SDoug Rabson 	u_long eofentry;
33827a0bc89SDoug Rabson 	u_long chaintofree;
33927a0bc89SDoug Rabson 	daddr_t bn;
34027a0bc89SDoug Rabson 	int boff;
34127a0bc89SDoug Rabson 	int isadir = dep->de_Attributes & ATTR_DIRECTORY;
34227a0bc89SDoug Rabson 	struct buf *bp;
34327a0bc89SDoug Rabson 	struct msdosfsmount *pmp = dep->de_pmp;
34427a0bc89SDoug Rabson 
34527a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
346952a6212SJordan K. Hubbard 	printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
34727a0bc89SDoug Rabson #endif
34827a0bc89SDoug Rabson 
34927a0bc89SDoug Rabson 	/*
35027a0bc89SDoug Rabson 	 * Disallow attempts to truncate the root directory since it is of
35127a0bc89SDoug Rabson 	 * fixed size.  That's just the way dos filesystems are.  We use
35227a0bc89SDoug Rabson 	 * the VROOT bit in the vnode because checking for the directory
35327a0bc89SDoug Rabson 	 * bit and a startcluster of 0 in the denode is not adequate to
35427a0bc89SDoug Rabson 	 * recognize the root directory at this point in a file or
35527a0bc89SDoug Rabson 	 * directory's life.
35627a0bc89SDoug Rabson 	 */
357e6e370a7SJeff Roberson 	if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) {
35854cf9198SKonstantin Belousov #ifdef MSDOSFS_DEBUG
359952a6212SJordan K. Hubbard 		printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
36027a0bc89SDoug Rabson 		    dep->de_dirclust, dep->de_diroffset);
36154cf9198SKonstantin Belousov #endif
362952a6212SJordan K. Hubbard 		return (EINVAL);
36327a0bc89SDoug Rabson 	}
36427a0bc89SDoug Rabson 
365bd7e5f99SJohn Dyson 	if (dep->de_FileSize < length) {
366bd7e5f99SJohn Dyson 		vnode_pager_setsize(DETOV(dep), length);
36727a0bc89SDoug Rabson 		return deextend(dep, length, cred);
368bd7e5f99SJohn Dyson 	}
36927a0bc89SDoug Rabson 
37027a0bc89SDoug Rabson 	/*
37127a0bc89SDoug Rabson 	 * If the desired length is 0 then remember the starting cluster of
37227a0bc89SDoug Rabson 	 * the file and set the StartCluster field in the directory entry
37327a0bc89SDoug Rabson 	 * to 0.  If the desired length is not zero, then get the number of
37427a0bc89SDoug Rabson 	 * the last cluster in the shortened file.  Then get the number of
37527a0bc89SDoug Rabson 	 * the first cluster in the part of the file that is to be freed.
37627a0bc89SDoug Rabson 	 * Then set the next cluster pointer in the last cluster of the
37727a0bc89SDoug Rabson 	 * file to CLUST_EOFE.
37827a0bc89SDoug Rabson 	 */
37927a0bc89SDoug Rabson 	if (length == 0) {
38027a0bc89SDoug Rabson 		chaintofree = dep->de_StartCluster;
38127a0bc89SDoug Rabson 		dep->de_StartCluster = 0;
38227a0bc89SDoug Rabson 		eofentry = ~0;
38327a0bc89SDoug Rabson 	} else {
384952a6212SJordan K. Hubbard 		error = pcbmap(dep, de_clcount(pmp, length) - 1, 0,
385952a6212SJordan K. Hubbard 			       &eofentry, 0);
386c3c6d51eSPoul-Henning Kamp 		if (error) {
38727a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
38827a0bc89SDoug Rabson 			printf("detrunc(): pcbmap fails %d\n", error);
38927a0bc89SDoug Rabson #endif
390952a6212SJordan K. Hubbard 			return (error);
39127a0bc89SDoug Rabson 		}
39227a0bc89SDoug Rabson 	}
39327a0bc89SDoug Rabson 
394952a6212SJordan K. Hubbard 	fc_purge(dep, de_clcount(pmp, length));
39527a0bc89SDoug Rabson 
39627a0bc89SDoug Rabson 	/*
39727a0bc89SDoug Rabson 	 * If the new length is not a multiple of the cluster size then we
39827a0bc89SDoug Rabson 	 * must zero the tail end of the new last cluster in case it
39927a0bc89SDoug Rabson 	 * becomes part of the file again because of a seek.
40027a0bc89SDoug Rabson 	 */
40127a0bc89SDoug Rabson 	if ((boff = length & pmp->pm_crbomask) != 0) {
40227a0bc89SDoug Rabson 		if (isadir) {
40327a0bc89SDoug Rabson 			bn = cntobn(pmp, eofentry);
40427a0bc89SDoug Rabson 			error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
40527a0bc89SDoug Rabson 			    NOCRED, &bp);
40627a0bc89SDoug Rabson 			if (error) {
407952a6212SJordan K. Hubbard 				brelse(bp);
40827a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
40927a0bc89SDoug Rabson 				printf("detrunc(): bread fails %d\n", error);
41027a0bc89SDoug Rabson #endif
411952a6212SJordan K. Hubbard 				return (error);
41227a0bc89SDoug Rabson 			}
41327a0bc89SDoug Rabson 			bzero(bp->b_data + boff, pmp->pm_bpcluster - boff);
41427a0bc89SDoug Rabson 			if (flags & IO_SYNC)
41527a0bc89SDoug Rabson 				bwrite(bp);
41627a0bc89SDoug Rabson 			else
41727a0bc89SDoug Rabson 				bdwrite(bp);
41827a0bc89SDoug Rabson 		}
419c2f95f66STom Rhodes 	}
42027a0bc89SDoug Rabson 
42127a0bc89SDoug Rabson 	/*
42227a0bc89SDoug Rabson 	 * Write out the updated directory entry.  Even if the update fails
42327a0bc89SDoug Rabson 	 * we free the trailing clusters.
42427a0bc89SDoug Rabson 	 */
42527a0bc89SDoug Rabson 	dep->de_FileSize = length;
426952a6212SJordan K. Hubbard 	if (!isadir)
427952a6212SJordan K. Hubbard 		dep->de_flag |= DE_UPDATE | DE_MODIFIED;
428c52fd858SEdward Tomasz Napierala 	allerror = vtruncbuf(DETOV(dep), cred, length, pmp->pm_bpcluster);
42944fdad99SPeter Wemm #ifdef MSDOSFS_DEBUG
43044fdad99SPeter Wemm 	if (allerror)
43144fdad99SPeter Wemm 		printf("detrunc(): vtruncbuf error %d\n", allerror);
43244fdad99SPeter Wemm #endif
4332aacee77SKonstantin Belousov 	error = deupdat(dep, !DOINGASYNC((DETOV(dep))));
434e3117f85SBruce Evans 	if (error != 0 && allerror == 0)
43544fdad99SPeter Wemm 		allerror = error;
43627a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
437952a6212SJordan K. Hubbard 	printf("detrunc(): allerror %d, eofentry %lu\n",
43827a0bc89SDoug Rabson 	       allerror, eofentry);
43927a0bc89SDoug Rabson #endif
44027a0bc89SDoug Rabson 
44127a0bc89SDoug Rabson 	/*
44227a0bc89SDoug Rabson 	 * If we need to break the cluster chain for the file then do it
44327a0bc89SDoug Rabson 	 * now.
44427a0bc89SDoug Rabson 	 */
44527a0bc89SDoug Rabson 	if (eofentry != ~0) {
44627a0bc89SDoug Rabson 		error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
44727a0bc89SDoug Rabson 				 &chaintofree, CLUST_EOFE);
44827a0bc89SDoug Rabson 		if (error) {
44927a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
45027a0bc89SDoug Rabson 			printf("detrunc(): fatentry errors %d\n", error);
45127a0bc89SDoug Rabson #endif
452952a6212SJordan K. Hubbard 			return (error);
45327a0bc89SDoug Rabson 		}
454952a6212SJordan K. Hubbard 		fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
45527a0bc89SDoug Rabson 			    eofentry);
45627a0bc89SDoug Rabson 	}
45727a0bc89SDoug Rabson 
45827a0bc89SDoug Rabson 	/*
45927a0bc89SDoug Rabson 	 * Now free the clusters removed from the file because of the
46027a0bc89SDoug Rabson 	 * truncation.
46127a0bc89SDoug Rabson 	 */
462952a6212SJordan K. Hubbard 	if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree))
46327a0bc89SDoug Rabson 		freeclusterchain(pmp, chaintofree);
46427a0bc89SDoug Rabson 
465952a6212SJordan K. Hubbard 	return (allerror);
46627a0bc89SDoug Rabson }
46727a0bc89SDoug Rabson 
46827a0bc89SDoug Rabson /*
46927a0bc89SDoug Rabson  * Extend the file described by dep to length specified by length.
47027a0bc89SDoug Rabson  */
47127a0bc89SDoug Rabson int
47210c9700fSEd Maste deextend(struct denode *dep, u_long length, struct ucred *cred)
47327a0bc89SDoug Rabson {
47427a0bc89SDoug Rabson 	struct msdosfsmount *pmp = dep->de_pmp;
47527a0bc89SDoug Rabson 	u_long count;
47627a0bc89SDoug Rabson 	int error;
47727a0bc89SDoug Rabson 
47827a0bc89SDoug Rabson 	/*
47927a0bc89SDoug Rabson 	 * The root of a DOS filesystem cannot be extended.
48027a0bc89SDoug Rabson 	 */
481e6e370a7SJeff Roberson 	if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp))
482952a6212SJordan K. Hubbard 		return (EINVAL);
48327a0bc89SDoug Rabson 
48427a0bc89SDoug Rabson 	/*
485952a6212SJordan K. Hubbard 	 * Directories cannot be extended.
48627a0bc89SDoug Rabson 	 */
487952a6212SJordan K. Hubbard 	if (dep->de_Attributes & ATTR_DIRECTORY)
488952a6212SJordan K. Hubbard 		return (EISDIR);
48927a0bc89SDoug Rabson 
49027a0bc89SDoug Rabson 	if (length <= dep->de_FileSize)
49127a0bc89SDoug Rabson 		panic("deextend: file too large");
49227a0bc89SDoug Rabson 
49327a0bc89SDoug Rabson 	/*
49427a0bc89SDoug Rabson 	 * Compute the number of clusters to allocate.
49527a0bc89SDoug Rabson 	 */
49627a0bc89SDoug Rabson 	count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
49727a0bc89SDoug Rabson 	if (count > 0) {
49827a0bc89SDoug Rabson 		if (count > pmp->pm_freeclustercount)
499952a6212SJordan K. Hubbard 			return (ENOSPC);
500c3c6d51eSPoul-Henning Kamp 		error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
501c3c6d51eSPoul-Henning Kamp 		if (error) {
50227a0bc89SDoug Rabson 			/* truncate the added clusters away again */
503c52fd858SEdward Tomasz Napierala 			(void) detrunc(dep, dep->de_FileSize, 0, cred);
504952a6212SJordan K. Hubbard 			return (error);
50527a0bc89SDoug Rabson 		}
50627a0bc89SDoug Rabson 	}
50727a0bc89SDoug Rabson 	dep->de_FileSize = length;
508952a6212SJordan K. Hubbard 	dep->de_flag |= DE_UPDATE | DE_MODIFIED;
5092aacee77SKonstantin Belousov 	return (deupdat(dep, !DOINGASYNC(DETOV(dep))));
51027a0bc89SDoug Rabson }
51127a0bc89SDoug Rabson 
51227a0bc89SDoug Rabson /*
51327a0bc89SDoug Rabson  * Move a denode to its correct hash queue after the file it represents has
51427a0bc89SDoug Rabson  * been moved to a new directory.
51527a0bc89SDoug Rabson  */
516952a6212SJordan K. Hubbard void
51710c9700fSEd Maste reinsert(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
54010c9700fSEd Maste msdosfs_reclaim(struct vop_reclaim_args *ap)
54127a0bc89SDoug Rabson {
54227a0bc89SDoug Rabson 	struct vnode *vp = ap->a_vp;
54327a0bc89SDoug Rabson 	struct denode *dep = VTODE(vp);
54427a0bc89SDoug Rabson 
54527a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
546f0707215SPoul-Henning Kamp 	printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
54727a0bc89SDoug Rabson 	    dep, dep->de_Name, dep->de_refcnt);
54827a0bc89SDoug Rabson #endif
54927a0bc89SDoug Rabson 
55027a0bc89SDoug Rabson 	/*
55192e73f57SAlfred Perlstein 	 * Destroy the vm object and flush associated pages.
55292e73f57SAlfred Perlstein 	 */
55392e73f57SAlfred Perlstein 	vnode_destroy_vobject(vp);
55492e73f57SAlfred Perlstein 	/*
555952a6212SJordan K. Hubbard 	 * Remove the denode from its hash chain.
55627a0bc89SDoug Rabson 	 */
557a30fc63bSPoul-Henning Kamp 	vfs_hash_remove(vp);
55827a0bc89SDoug Rabson 	/*
559952a6212SJordan K. Hubbard 	 * Purge old data structures associated with the denode.
56027a0bc89SDoug Rabson 	 */
561952a6212SJordan K. Hubbard #if 0 /* XXX */
56227a0bc89SDoug Rabson 	dep->de_flag = 0;
563952a6212SJordan K. Hubbard #endif
5641ede983cSDag-Erling Smørgrav 	free(dep, M_MSDOSFSNODE);
56527a0bc89SDoug Rabson 	vp->v_data = NULL;
56627a0bc89SDoug Rabson 
567952a6212SJordan K. Hubbard 	return (0);
56827a0bc89SDoug Rabson }
56927a0bc89SDoug Rabson 
57027a0bc89SDoug Rabson int
57110c9700fSEd Maste msdosfs_inactive(struct vop_inactive_args *ap)
57227a0bc89SDoug Rabson {
57327a0bc89SDoug Rabson 	struct vnode *vp = ap->a_vp;
57427a0bc89SDoug Rabson 	struct denode *dep = VTODE(vp);
57527a0bc89SDoug Rabson 	int error = 0;
57627a0bc89SDoug Rabson 
57727a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
578f0707215SPoul-Henning Kamp 	printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
57927a0bc89SDoug Rabson #endif
58027a0bc89SDoug Rabson 
58127a0bc89SDoug Rabson 	/*
582952a6212SJordan K. Hubbard 	 * Ignore denodes related to stale file handles.
58327a0bc89SDoug Rabson 	 */
584740a7201SKonstantin Belousov 	if (dep->de_Name[0] == SLOT_DELETED || dep->de_Name[0] == SLOT_EMPTY)
585af3f60d5SBruce Evans 		goto out;
58627a0bc89SDoug Rabson 
58727a0bc89SDoug Rabson 	/*
58827a0bc89SDoug Rabson 	 * If the file has been deleted and it is on a read/write
58927a0bc89SDoug Rabson 	 * filesystem, then truncate the file, and mark the directory slot
59027a0bc89SDoug Rabson 	 * as empty.  (This may not be necessary for the dos filesystem.)
59127a0bc89SDoug Rabson 	 */
59227a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
593f0707215SPoul-Henning Kamp 	printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n",
59427a0bc89SDoug Rabson 	       dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY);
59527a0bc89SDoug Rabson #endif
59627a0bc89SDoug Rabson 	if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
597c52fd858SEdward Tomasz Napierala 		error = detrunc(dep, (u_long) 0, 0, NOCRED);
59827a0bc89SDoug Rabson 		dep->de_flag |= DE_UPDATE;
59927a0bc89SDoug Rabson 		dep->de_Name[0] = SLOT_DELETED;
60027a0bc89SDoug Rabson 	}
601952a6212SJordan K. Hubbard 	deupdat(dep, 0);
602952a6212SJordan K. Hubbard 
603af3f60d5SBruce Evans out:
60427a0bc89SDoug Rabson 	/*
605952a6212SJordan K. Hubbard 	 * If we are done with the denode, reclaim it
606952a6212SJordan K. Hubbard 	 * so that it can be reused immediately.
60727a0bc89SDoug Rabson 	 */
60827a0bc89SDoug Rabson #ifdef MSDOSFS_DEBUG
6094d93c0beSJeff Roberson 	printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n",
6104d93c0beSJeff Roberson 	       vrefcnt(vp), dep->de_Name[0]);
61127a0bc89SDoug Rabson #endif
612740a7201SKonstantin Belousov 	if (dep->de_Name[0] == SLOT_DELETED || dep->de_Name[0] == SLOT_EMPTY)
613af6e6b87SEdward Tomasz Napierala 		vrecycle(vp);
614952a6212SJordan K. Hubbard 	return (error);
61527a0bc89SDoug Rabson }
616