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