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Annotation of src/sys/fs/msdosfs/msdosfs_denode.c, Revision 1.8.2.5

1.8.2.5 ! yamt        1: /*     $NetBSD: msdosfs_denode.c,v 1.8.2.4 2007/09/03 14:40:24 yamt Exp $      */
1.1       jdolecek    2:
                      3: /*-
                      4:  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
                      5:  * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
                      6:  * All rights reserved.
                      7:  * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
                      8:  *
                      9:  * Redistribution and use in source and binary forms, with or without
                     10:  * modification, are permitted provided that the following conditions
                     11:  * are met:
                     12:  * 1. Redistributions of source code must retain the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer.
                     14:  * 2. Redistributions in binary form must reproduce the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer in the
                     16:  *    documentation and/or other materials provided with the distribution.
                     17:  * 3. All advertising materials mentioning features or use of this software
                     18:  *    must display the following acknowledgement:
                     19:  *     This product includes software developed by TooLs GmbH.
                     20:  * 4. The name of TooLs GmbH may not be used to endorse or promote products
                     21:  *    derived from this software without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
                     24:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     25:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     26:  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
                     27:  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
                     28:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
                     29:  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
                     30:  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
                     31:  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
                     32:  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     33:  */
                     34: /*
                     35:  * Written by Paul Popelka (paulp@uts.amdahl.com)
                     36:  *
                     37:  * You can do anything you want with this software, just don't say you wrote
                     38:  * it, and don't remove this notice.
                     39:  *
                     40:  * This software is provided "as is".
                     41:  *
                     42:  * The author supplies this software to be publicly redistributed on the
                     43:  * understanding that the author is not responsible for the correct
                     44:  * functioning of this software in any circumstances and is not liable for
                     45:  * any damages caused by this software.
                     46:  *
                     47:  * October 1992
                     48:  */
                     49:
                     50: #include <sys/cdefs.h>
1.8.2.5 ! yamt       51: __KERNEL_RCSID(0, "$NetBSD: msdosfs_denode.c,v 1.8.2.4 2007/09/03 14:40:24 yamt Exp $");
1.1       jdolecek   52:
                     53: #include <sys/param.h>
                     54: #include <sys/systm.h>
                     55: #include <sys/mount.h>
                     56: #include <sys/malloc.h>
                     57: #include <sys/pool.h>
                     58: #include <sys/proc.h>
                     59: #include <sys/buf.h>
                     60: #include <sys/vnode.h>
                     61: #include <sys/kernel.h>                /* defines "time" */
                     62: #include <sys/dirent.h>
                     63: #include <sys/namei.h>
1.8.2.1   yamt       64: #include <sys/kauth.h>
1.1       jdolecek   65:
                     66: #include <uvm/uvm_extern.h>
                     67:
                     68: #include <fs/msdosfs/bpb.h>
                     69: #include <fs/msdosfs/msdosfsmount.h>
                     70: #include <fs/msdosfs/direntry.h>
                     71: #include <fs/msdosfs/denode.h>
                     72: #include <fs/msdosfs/fat.h>
                     73:
                     74: LIST_HEAD(ihashhead, denode) *dehashtbl;
                     75: u_long dehash;                 /* size of hash table - 1 */
                     76: #define        DEHASH(dev, dcl, doff) \
                     77:     (((dev) + (dcl) + (doff) / sizeof(struct direntry)) & dehash)
                     78:
                     79: struct simplelock msdosfs_ihash_slock;
                     80:
1.8.2.4   yamt       81: struct pool msdosfs_denode_pool;
1.1       jdolecek   82:
                     83: extern int prtactive;
                     84:
1.8       yamt       85: static const struct genfs_ops msdosfs_genfsops = {
                     86:        .gop_size = genfs_size,
                     87:        .gop_alloc = msdosfs_gop_alloc,
                     88:        .gop_write = genfs_gop_write,
1.8.2.1   yamt       89:        .gop_markupdate = msdosfs_gop_markupdate,
1.1       jdolecek   90: };
                     91:
1.8.2.1   yamt       92: static struct denode *msdosfs_hashget(dev_t, u_long, u_long);
                     93: static void msdosfs_hashins(struct denode *);
                     94: static void msdosfs_hashrem(struct denode *);
1.1       jdolecek   95:
1.5       atatat     96: MALLOC_DECLARE(M_MSDOSFSFAT);
                     97:
1.1       jdolecek   98: void
                     99: msdosfs_init()
                    100: {
1.8.2.4   yamt      101:
1.5       atatat    102:        malloc_type_attach(M_MSDOSFSMNT);
                    103:        malloc_type_attach(M_MSDOSFSFAT);
1.8.2.5 ! yamt      104:        malloc_type_attach(M_MSDOSFSTMP);
1.7       atatat    105:        pool_init(&msdosfs_denode_pool, sizeof(struct denode), 0, 0, 0,
1.8.2.4   yamt      106:            "msdosnopl", &pool_allocator_nointr, IPL_NONE);
1.1       jdolecek  107:        dehashtbl = hashinit(desiredvnodes / 2, HASH_LIST, M_MSDOSFSMNT,
                    108:            M_WAITOK, &dehash);
                    109:        simple_lock_init(&msdosfs_ihash_slock);
                    110: }
                    111:
                    112: /*
                    113:  * Reinitialize inode hash table.
                    114:  */
                    115:
                    116: void
                    117: msdosfs_reinit()
                    118: {
                    119:        struct denode *dep;
                    120:        struct ihashhead *oldhash, *hash;
                    121:        u_long oldmask, mask, val;
                    122:        int i;
                    123:
                    124:        hash = hashinit(desiredvnodes / 2, HASH_LIST, M_MSDOSFSMNT, M_WAITOK,
                    125:            &mask);
                    126:
                    127:        simple_lock(&msdosfs_ihash_slock);
                    128:        oldhash = dehashtbl;
                    129:        oldmask = dehash;
                    130:        dehashtbl = hash;
                    131:        dehash = mask;
                    132:        for (i = 0; i <= oldmask; i++) {
                    133:                while ((dep = LIST_FIRST(&oldhash[i])) != NULL) {
                    134:                        LIST_REMOVE(dep, de_hash);
                    135:                        val = DEHASH(dep->de_dev, dep->de_dirclust,
                    136:                            dep->de_diroffset);
                    137:                        LIST_INSERT_HEAD(&hash[val], dep, de_hash);
                    138:                }
                    139:        }
                    140:        simple_unlock(&msdosfs_ihash_slock);
                    141:        hashdone(oldhash, M_MSDOSFSMNT);
                    142: }
                    143:
                    144: void
                    145: msdosfs_done()
                    146: {
                    147:        hashdone(dehashtbl, M_MSDOSFSMNT);
                    148:        pool_destroy(&msdosfs_denode_pool);
1.8.2.5 ! yamt      149:        malloc_type_detach(M_MSDOSFSTMP);
1.5       atatat    150:        malloc_type_detach(M_MSDOSFSFAT);
                    151:        malloc_type_detach(M_MSDOSFSMNT);
1.1       jdolecek  152: }
                    153:
                    154: static struct denode *
1.4       fvdl      155: msdosfs_hashget(dev, dirclust, diroff)
1.1       jdolecek  156:        dev_t dev;
                    157:        u_long dirclust;
                    158:        u_long diroff;
                    159: {
                    160:        struct denode *dep;
                    161:        struct vnode *vp;
                    162:
                    163: loop:
                    164:        simple_lock(&msdosfs_ihash_slock);
                    165:        LIST_FOREACH(dep, &dehashtbl[DEHASH(dev, dirclust, diroff)], de_hash) {
                    166:                if (dirclust == dep->de_dirclust &&
                    167:                    diroff == dep->de_diroffset &&
                    168:                    dev == dep->de_dev &&
                    169:                    dep->de_refcnt != 0) {
                    170:                        vp = DETOV(dep);
                    171:                        simple_lock(&vp->v_interlock);
                    172:                        simple_unlock(&msdosfs_ihash_slock);
1.3       thorpej   173:                        if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK))
1.1       jdolecek  174:                                goto loop;
                    175:                        return (dep);
                    176:                }
                    177:        }
                    178:        simple_unlock(&msdosfs_ihash_slock);
                    179:        return (NULL);
                    180: }
                    181:
                    182: static void
                    183: msdosfs_hashins(dep)
                    184:        struct denode *dep;
                    185: {
                    186:        struct ihashhead *depp;
                    187:        int val;
                    188:
                    189:        simple_lock(&msdosfs_ihash_slock);
                    190:        val = DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset);
                    191:        depp = &dehashtbl[val];
                    192:        LIST_INSERT_HEAD(depp, dep, de_hash);
                    193:        simple_unlock(&msdosfs_ihash_slock);
                    194: }
                    195:
                    196: static void
                    197: msdosfs_hashrem(dep)
                    198:        struct denode *dep;
                    199: {
                    200:        simple_lock(&msdosfs_ihash_slock);
                    201:        LIST_REMOVE(dep, de_hash);
                    202:        simple_unlock(&msdosfs_ihash_slock);
                    203: }
                    204:
                    205: /*
                    206:  * If deget() succeeds it returns with the gotten denode locked().
                    207:  *
                    208:  * pmp      - address of msdosfsmount structure of the filesystem containing
                    209:  *            the denode of interest.  The pm_dev field and the address of
                    210:  *            the msdosfsmount structure are used.
                    211:  * dirclust  - which cluster bp contains, if dirclust is 0 (root directory)
                    212:  *            diroffset is relative to the beginning of the root directory,
                    213:  *            otherwise it is cluster relative.
                    214:  * diroffset - offset past begin of cluster of denode we want
                    215:  * depp             - returns the address of the gotten denode.
                    216:  */
                    217: int
                    218: deget(pmp, dirclust, diroffset, depp)
                    219:        struct msdosfsmount *pmp;       /* so we know the maj/min number */
                    220:        u_long dirclust;                /* cluster this dir entry came from */
                    221:        u_long diroffset;               /* index of entry within the cluster */
                    222:        struct denode **depp;           /* returns the addr of the gotten denode */
                    223: {
                    224:        int error;
1.8.2.1   yamt      225:        extern int (**msdosfs_vnodeop_p)(void *);
1.1       jdolecek  226:        struct direntry *direntptr;
                    227:        struct denode *ldep;
                    228:        struct vnode *nvp;
                    229:        struct buf *bp;
                    230:
                    231: #ifdef MSDOSFS_DEBUG
                    232:        printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n",
                    233:            pmp, dirclust, diroffset, depp);
                    234: #endif
                    235:
                    236:        /*
                    237:         * On FAT32 filesystems, root is a (more or less) normal
                    238:         * directory
                    239:         */
                    240:        if (FAT32(pmp) && dirclust == MSDOSFSROOT)
                    241:                dirclust = pmp->pm_rootdirblk;
                    242:
                    243:        /*
                    244:         * See if the denode is in the denode cache. Use the location of
                    245:         * the directory entry to compute the hash value. For subdir use
                    246:         * address of "." entry. For root dir (if not FAT32) use cluster
                    247:         * MSDOSFSROOT, offset MSDOSFSROOT_OFS
                    248:         *
                    249:         * NOTE: The check for de_refcnt > 0 below insures the denode being
                    250:         * examined does not represent an unlinked but still open file.
                    251:         * These files are not to be accessible even when the directory
                    252:         * entry that represented the file happens to be reused while the
                    253:         * deleted file is still open.
                    254:         */
1.4       fvdl      255:        ldep = msdosfs_hashget(pmp->pm_dev, dirclust, diroffset);
1.1       jdolecek  256:        if (ldep) {
                    257:                *depp = ldep;
                    258:                return (0);
                    259:        }
                    260:
                    261:        /*
                    262:         * Directory entry was not in cache, have to create a vnode and
                    263:         * copy it from the passed disk buffer.
                    264:         */
                    265:        /* getnewvnode() does a VREF() on the vnode */
                    266:        error = getnewvnode(VT_MSDOSFS, pmp->pm_mountp,
                    267:                            msdosfs_vnodeop_p, &nvp);
                    268:        if (error) {
                    269:                *depp = 0;
                    270:                return (error);
                    271:        }
                    272:        ldep = pool_get(&msdosfs_denode_pool, PR_WAITOK);
                    273:        memset(ldep, 0, sizeof *ldep);
                    274:        nvp->v_data = ldep;
                    275:        ldep->de_vnode = nvp;
                    276:        ldep->de_flag = 0;
                    277:        ldep->de_devvp = 0;
                    278:        ldep->de_lockf = 0;
                    279:        ldep->de_dev = pmp->pm_dev;
                    280:        ldep->de_dirclust = dirclust;
                    281:        ldep->de_diroffset = diroffset;
                    282:        fc_purge(ldep, 0);      /* init the fat cache for this denode */
                    283:
                    284:        /*
                    285:         * Insert the denode into the hash queue and lock the denode so it
                    286:         * can't be accessed until we've read it in and have done what we
                    287:         * need to it.
                    288:         */
                    289:        vn_lock(nvp, LK_EXCLUSIVE | LK_RETRY);
1.8.2.5 ! yamt      290:        genfs_node_init(nvp, &msdosfs_genfsops);
1.1       jdolecek  291:        msdosfs_hashins(ldep);
                    292:
                    293:        ldep->de_pmp = pmp;
                    294:        ldep->de_devvp = pmp->pm_devvp;
                    295:        ldep->de_refcnt = 1;
                    296:        /*
                    297:         * Copy the directory entry into the denode area of the vnode.
                    298:         */
                    299:        if ((dirclust == MSDOSFSROOT
                    300:             || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
                    301:            && diroffset == MSDOSFSROOT_OFS) {
                    302:                /*
                    303:                 * Directory entry for the root directory. There isn't one,
                    304:                 * so we manufacture one. We should probably rummage
                    305:                 * through the root directory and find a label entry (if it
                    306:                 * exists), and then use the time and date from that entry
                    307:                 * as the time and date for the root denode.
                    308:                 */
1.8.2.5 ! yamt      309:                nvp->v_vflag |= VV_ROOT; /* should be further down XXX */
1.1       jdolecek  310:
                    311:                ldep->de_Attributes = ATTR_DIRECTORY;
                    312:                if (FAT32(pmp))
                    313:                        ldep->de_StartCluster = pmp->pm_rootdirblk;
                    314:                        /* de_FileSize will be filled in further down */
                    315:                else {
                    316:                        ldep->de_StartCluster = MSDOSFSROOT;
                    317:                        ldep->de_FileSize = pmp->pm_rootdirsize * pmp->pm_BytesPerSec;
                    318:                }
                    319:                /*
                    320:                 * fill in time and date so that dos2unixtime() doesn't
                    321:                 * spit up when called from msdosfs_getattr() with root
                    322:                 * denode
                    323:                 */
                    324:                ldep->de_CHun = 0;
                    325:                ldep->de_CTime = 0x0000;        /* 00:00:00      */
                    326:                ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
                    327:                    | (1 << DD_DAY_SHIFT);
                    328:                /* Jan 1, 1980   */
                    329:                ldep->de_ADate = ldep->de_CDate;
                    330:                ldep->de_MTime = ldep->de_CTime;
                    331:                ldep->de_MDate = ldep->de_CDate;
                    332:                /* leave the other fields as garbage */
                    333:        } else {
                    334:                error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
1.8.2.5 ! yamt      335:                if (error) {
        !           336:                        ldep->de_devvp = NULL;
        !           337:                        ldep->de_Name[0] = SLOT_DELETED;
        !           338:                        vput(nvp);
1.1       jdolecek  339:                        return (error);
1.8.2.5 ! yamt      340:                }
1.1       jdolecek  341:                DE_INTERNALIZE(ldep, direntptr);
1.8.2.5 ! yamt      342:                brelse(bp, 0);
1.1       jdolecek  343:        }
                    344:
                    345:        /*
                    346:         * Fill in a few fields of the vnode and finish filling in the
                    347:         * denode.  Then return the address of the found denode.
                    348:         */
                    349:        if (ldep->de_Attributes & ATTR_DIRECTORY) {
                    350:                /*
                    351:                 * Since DOS directory entries that describe directories
                    352:                 * have 0 in the filesize field, we take this opportunity
                    353:                 * to find out the length of the directory and plug it into
                    354:                 * the denode structure.
                    355:                 */
                    356:                u_long size;
                    357:
                    358:                nvp->v_type = VDIR;
                    359:                if (ldep->de_StartCluster != MSDOSFSROOT) {
                    360:                        error = pcbmap(ldep, CLUST_END, 0, &size, 0);
                    361:                        if (error == E2BIG) {
                    362:                                ldep->de_FileSize = de_cn2off(pmp, size);
                    363:                                error = 0;
                    364:                        } else
                    365:                                printf("deget(): pcbmap returned %d\n", error);
                    366:                }
                    367:        } else
                    368:                nvp->v_type = VREG;
                    369:        VREF(ldep->de_devvp);
                    370:        *depp = ldep;
1.8.2.4   yamt      371:        uvm_vnp_setsize(nvp, ldep->de_FileSize);
1.1       jdolecek  372:        return (0);
                    373: }
                    374:
                    375: int
                    376: deupdat(dep, waitfor)
                    377:        struct denode *dep;
                    378:        int waitfor;
                    379: {
                    380:
1.8.2.1   yamt      381:        return (msdosfs_update(DETOV(dep), NULL, NULL,
                    382:            waitfor ? UPDATE_WAIT : 0));
1.1       jdolecek  383: }
                    384:
                    385: /*
                    386:  * Truncate the file described by dep to the length specified by length.
                    387:  */
                    388: int
1.8.2.2   yamt      389: detrunc(struct denode *dep, u_long length, int flags, kauth_cred_t cred,
                    390:     struct lwp *l)
1.1       jdolecek  391: {
                    392:        int error;
                    393:        int allerror;
                    394:        u_long eofentry;
1.8.2.1   yamt      395:        u_long chaintofree = 0;
1.1       jdolecek  396:        daddr_t bn, lastblock;
                    397:        int boff;
                    398:        int isadir = dep->de_Attributes & ATTR_DIRECTORY;
                    399:        struct buf *bp;
                    400:        struct msdosfsmount *pmp = dep->de_pmp;
                    401:
                    402: #ifdef MSDOSFS_DEBUG
                    403:        printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
                    404: #endif
                    405:
                    406:        /*
                    407:         * Disallow attempts to truncate the root directory since it is of
                    408:         * fixed size.  That's just the way dos filesystems are.  We use
                    409:         * the VROOT bit in the vnode because checking for the directory
                    410:         * bit and a startcluster of 0 in the denode is not adequate to
                    411:         * recognize the root directory at this point in a file or
                    412:         * directory's life.
                    413:         */
1.8.2.5 ! yamt      414:        if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) {
1.1       jdolecek  415:                printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
                    416:                    dep->de_dirclust, dep->de_diroffset);
                    417:                return (EINVAL);
                    418:        }
                    419:
                    420:        uvm_vnp_setsize(DETOV(dep), length);
                    421:
                    422:        if (dep->de_FileSize < length)
                    423:                return (deextend(dep, length, cred));
                    424:        lastblock = de_clcount(pmp, length) - 1;
                    425:
                    426:        /*
                    427:         * If the desired length is 0 then remember the starting cluster of
                    428:         * the file and set the StartCluster field in the directory entry
                    429:         * to 0.  If the desired length is not zero, then get the number of
                    430:         * the last cluster in the shortened file.  Then get the number of
                    431:         * the first cluster in the part of the file that is to be freed.
                    432:         * Then set the next cluster pointer in the last cluster of the
                    433:         * file to CLUST_EOFE.
                    434:         */
                    435:        if (length == 0) {
                    436:                chaintofree = dep->de_StartCluster;
                    437:                dep->de_StartCluster = 0;
                    438:                eofentry = ~0;
                    439:        } else {
                    440:                error = pcbmap(dep, lastblock, 0, &eofentry, 0);
                    441:                if (error) {
                    442: #ifdef MSDOSFS_DEBUG
                    443:                        printf("detrunc(): pcbmap fails %d\n", error);
                    444: #endif
                    445:                        return (error);
                    446:                }
                    447:        }
                    448:
                    449:        fc_purge(dep, lastblock + 1);
                    450:
                    451:        /*
                    452:         * If the new length is not a multiple of the cluster size then we
                    453:         * must zero the tail end of the new last cluster in case it
                    454:         * becomes part of the file again because of a seek.
                    455:         */
                    456:        if ((boff = length & pmp->pm_crbomask) != 0) {
                    457:                if (isadir) {
                    458:                        bn = cntobn(pmp, eofentry);
1.8.2.2   yamt      459:                        error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn),
                    460:                            pmp->pm_bpcluster, NOCRED, &bp);
1.1       jdolecek  461:                        if (error) {
1.8.2.5 ! yamt      462:                                brelse(bp, 0);
1.1       jdolecek  463: #ifdef MSDOSFS_DEBUG
                    464:                                printf("detrunc(): bread fails %d\n", error);
                    465: #endif
                    466:                                return (error);
                    467:                        }
1.8.2.4   yamt      468:                        memset((char *)bp->b_data + boff, 0,
                    469:                            pmp->pm_bpcluster - boff);
1.1       jdolecek  470:                        if (flags & IO_SYNC)
                    471:                                bwrite(bp);
                    472:                        else
                    473:                                bdwrite(bp);
                    474:                } else {
                    475:                        uvm_vnp_zerorange(DETOV(dep), length,
                    476:                                          pmp->pm_bpcluster - boff);
                    477:                }
                    478:        }
                    479:
                    480:        /*
                    481:         * Write out the updated directory entry.  Even if the update fails
                    482:         * we free the trailing clusters.
                    483:         */
                    484:        dep->de_FileSize = length;
                    485:        if (!isadir)
                    486:                dep->de_flag |= DE_UPDATE|DE_MODIFIED;
                    487:        vtruncbuf(DETOV(dep), lastblock + 1, 0, 0);
                    488:        allerror = deupdat(dep, 1);
                    489: #ifdef MSDOSFS_DEBUG
                    490:        printf("detrunc(): allerror %d, eofentry %lu\n",
                    491:               allerror, eofentry);
                    492: #endif
                    493:
                    494:        /*
                    495:         * If we need to break the cluster chain for the file then do it
                    496:         * now.
                    497:         */
                    498:        if (eofentry != ~0) {
                    499:                error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
                    500:                                 &chaintofree, CLUST_EOFE);
                    501:                if (error) {
                    502: #ifdef MSDOSFS_DEBUG
                    503:                        printf("detrunc(): fatentry errors %d\n", error);
                    504: #endif
                    505:                        return (error);
                    506:                }
                    507:                fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
                    508:                            eofentry);
                    509:        }
                    510:
                    511:        /*
                    512:         * Now free the clusters removed from the file because of the
                    513:         * truncation.
                    514:         */
                    515:        if (chaintofree != 0 && !MSDOSFSEOF(chaintofree, pmp->pm_fatmask))
                    516:                freeclusterchain(pmp, chaintofree);
                    517:
                    518:        return (allerror);
                    519: }
                    520:
                    521: /*
                    522:  * Extend the file described by dep to length specified by length.
                    523:  */
                    524: int
                    525: deextend(dep, length, cred)
                    526:        struct denode *dep;
                    527:        u_long length;
1.8.2.1   yamt      528:        kauth_cred_t cred;
1.1       jdolecek  529: {
                    530:        struct msdosfsmount *pmp = dep->de_pmp;
                    531:        u_long count, osize;
                    532:        int error;
                    533:
                    534:        /*
                    535:         * The root of a DOS filesystem cannot be extended.
                    536:         */
1.8.2.5 ! yamt      537:        if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp))
1.1       jdolecek  538:                return (EINVAL);
                    539:
                    540:        /*
                    541:         * Directories cannot be extended.
                    542:         */
                    543:        if (dep->de_Attributes & ATTR_DIRECTORY)
                    544:                return (EISDIR);
                    545:
                    546:        if (length <= dep->de_FileSize)
                    547:                panic("deextend: file too large");
                    548:
                    549:        /*
                    550:         * Compute the number of clusters to allocate.
                    551:         */
                    552:        count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
                    553:        if (count > 0) {
                    554:                if (count > pmp->pm_freeclustercount)
                    555:                        return (ENOSPC);
                    556:                error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
                    557:                if (error) {
                    558:                        /* truncate the added clusters away again */
                    559:                        (void) detrunc(dep, dep->de_FileSize, 0, cred, NULL);
                    560:                        return (error);
                    561:                }
                    562:        }
                    563:
                    564:        osize = dep->de_FileSize;
                    565:        dep->de_FileSize = length;
                    566:        uvm_vnp_setsize(DETOV(dep), (voff_t)dep->de_FileSize);
                    567:        dep->de_flag |= DE_UPDATE|DE_MODIFIED;
                    568:        uvm_vnp_zerorange(DETOV(dep), (off_t)osize,
                    569:            (size_t)(dep->de_FileSize - osize));
                    570:        return (deupdat(dep, 1));
                    571: }
                    572:
                    573: /*
                    574:  * Move a denode to its correct hash queue after the file it represents has
                    575:  * been moved to a new directory.
                    576:  */
                    577: void
                    578: reinsert(dep)
                    579:        struct denode *dep;
                    580: {
                    581:        /*
                    582:         * Fix up the denode cache.  If the denode is for a directory,
                    583:         * there is nothing to do since the hash is based on the starting
                    584:         * cluster of the directory file and that hasn't changed.  If for a
                    585:         * file the hash is based on the location of the directory entry,
                    586:         * so we must remove it from the cache and re-enter it with the
                    587:         * hash based on the new location of the directory entry.
                    588:         */
                    589:        if (dep->de_Attributes & ATTR_DIRECTORY)
                    590:                return;
                    591:        msdosfs_hashrem(dep);
                    592:        msdosfs_hashins(dep);
                    593: }
                    594:
                    595: int
                    596: msdosfs_reclaim(v)
                    597:        void *v;
                    598: {
                    599:        struct vop_reclaim_args /* {
                    600:                struct vnode *a_vp;
                    601:        } */ *ap = v;
                    602:        struct vnode *vp = ap->a_vp;
                    603:        struct denode *dep = VTODE(vp);
                    604:
                    605: #ifdef MSDOSFS_DEBUG
                    606:        printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
                    607:            dep, dep->de_Name, dep->de_refcnt);
                    608: #endif
                    609:
                    610:        if (prtactive && vp->v_usecount != 0)
                    611:                vprint("msdosfs_reclaim(): pushing active", vp);
                    612:        /*
                    613:         * Remove the denode from its hash chain.
                    614:         */
                    615:        msdosfs_hashrem(dep);
                    616:        /*
                    617:         * Purge old data structures associated with the denode.
                    618:         */
                    619:        cache_purge(vp);
                    620:        if (dep->de_devvp) {
                    621:                vrele(dep->de_devvp);
                    622:                dep->de_devvp = 0;
                    623:        }
                    624: #if 0 /* XXX */
                    625:        dep->de_flag = 0;
                    626: #endif
1.8.2.3   yamt      627:        genfs_node_destroy(vp);
1.1       jdolecek  628:        pool_put(&msdosfs_denode_pool, dep);
                    629:        vp->v_data = NULL;
                    630:        return (0);
                    631: }
                    632:
                    633: int
                    634: msdosfs_inactive(v)
                    635:        void *v;
                    636: {
                    637:        struct vop_inactive_args /* {
                    638:                struct vnode *a_vp;
1.8.2.1   yamt      639:                struct lwp *a_l;
1.1       jdolecek  640:        } */ *ap = v;
1.8.2.1   yamt      641:        struct lwp *l = ap->a_l;
1.1       jdolecek  642:        struct vnode *vp = ap->a_vp;
                    643:        struct denode *dep = VTODE(vp);
                    644:        int error = 0;
                    645:
                    646: #ifdef MSDOSFS_DEBUG
                    647:        printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
                    648: #endif
                    649:
                    650:        if (prtactive && vp->v_usecount != 0)
                    651:                vprint("msdosfs_inactive(): pushing active", vp);
                    652:
                    653:        /*
                    654:         * Get rid of denodes related to stale file handles.
                    655:         */
                    656:        if (dep->de_Name[0] == SLOT_DELETED)
                    657:                goto out;
                    658:
                    659:        /*
                    660:         * If the file has been deleted and it is on a read/write
                    661:         * filesystem, then truncate the file, and mark the directory slot
                    662:         * as empty.  (This may not be necessary for the dos filesystem.)
                    663:         */
                    664: #ifdef MSDOSFS_DEBUG
                    665:        printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x %s\n",
                    666:               dep, dep->de_refcnt, vp->v_mount->mnt_flag,
                    667:                (vp->v_mount->mnt_flag & MNT_RDONLY) ? "MNT_RDONLY" : "");
                    668: #endif
                    669:        if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
                    670:                if (dep->de_FileSize != 0) {
                    671:                        error = detrunc(dep, (u_long)0, 0, NOCRED, NULL);
                    672:                }
                    673:                dep->de_Name[0] = SLOT_DELETED;
                    674:        }
                    675:        deupdat(dep, 0);
                    676: out:
                    677:        VOP_UNLOCK(vp, 0);
                    678:        /*
                    679:         * If we are done with the denode, reclaim it
                    680:         * so that it can be reused immediately.
                    681:         */
                    682: #ifdef MSDOSFS_DEBUG
                    683:        printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n",
                    684:                vp->v_usecount, dep->de_Name[0]);
                    685: #endif
                    686:        if (dep->de_Name[0] == SLOT_DELETED)
1.8.2.1   yamt      687:                vrecycle(vp, (struct simplelock *)0, l);
1.1       jdolecek  688:        return (error);
                    689: }
                    690:
                    691: int
1.8.2.2   yamt      692: msdosfs_gop_alloc(struct vnode *vp, off_t off,
                    693:     off_t len, int flags, kauth_cred_t cred)
1.1       jdolecek  694: {
                    695:        return 0;
                    696: }
1.8.2.1   yamt      697:
                    698: void
                    699: msdosfs_gop_markupdate(struct vnode *vp, int flags)
                    700: {
                    701:        u_long mask = 0;
                    702:
                    703:        if ((flags & GOP_UPDATE_ACCESSED) != 0) {
                    704:                mask = DE_ACCESS;
                    705:        }
                    706:        if ((flags & GOP_UPDATE_MODIFIED) != 0) {
                    707:                mask |= DE_UPDATE;
                    708:        }
                    709:        if (mask) {
                    710:                struct denode *dep = VTODE(vp);
                    711:
                    712:                dep->de_flag |= mask;
                    713:        }
                    714: }

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