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Annotation of src/sys/fs/msdosfs/msdosfs_vnops.c, Revision 1.26.4.2

1.26.4.2! elad        1: /*     $NetBSD: msdosfs_vnops.c,v 1.26.4.1 2006/03/08 01:31:33 elad 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>
1.26.4.2! elad       51: __KERNEL_RCSID(0, "$NetBSD: msdosfs_vnops.c,v 1.26.4.1 2006/03/08 01:31:33 elad Exp $");
1.1       jdolecek   52:
                     53: #include <sys/param.h>
                     54: #include <sys/systm.h>
                     55: #include <sys/namei.h>
                     56: #include <sys/resourcevar.h>   /* defines plimit structure in proc struct */
                     57: #include <sys/kernel.h>
                     58: #include <sys/file.h>          /* define FWRITE ... */
                     59: #include <sys/stat.h>
                     60: #include <sys/buf.h>
                     61: #include <sys/proc.h>
                     62: #include <sys/mount.h>
                     63: #include <sys/vnode.h>
                     64: #include <sys/signalvar.h>
                     65: #include <sys/malloc.h>
                     66: #include <sys/dirent.h>
                     67: #include <sys/lockf.h>
                     68:
                     69: #include <miscfs/genfs/genfs.h>
                     70: #include <miscfs/specfs/specdev.h> /* XXX */   /* defines v_rdev */
                     71:
                     72: #include <uvm/uvm_extern.h>
                     73:
                     74: #include <fs/msdosfs/bpb.h>
                     75: #include <fs/msdosfs/direntry.h>
                     76: #include <fs/msdosfs/denode.h>
                     77: #include <fs/msdosfs/msdosfsmount.h>
                     78: #include <fs/msdosfs/fat.h>
                     79:
                     80: /*
                     81:  * Some general notes:
                     82:  *
                     83:  * In the ufs filesystem the inodes, superblocks, and indirect blocks are
                     84:  * read/written using the vnode for the filesystem. Blocks that represent
                     85:  * the contents of a file are read/written using the vnode for the file
                     86:  * (including directories when they are read/written as files). This
                     87:  * presents problems for the dos filesystem because data that should be in
                     88:  * an inode (if dos had them) resides in the directory itself.  Since we
                     89:  * must update directory entries without the benefit of having the vnode
                     90:  * for the directory we must use the vnode for the filesystem.  This means
                     91:  * that when a directory is actually read/written (via read, write, or
                     92:  * readdir, or seek) we must use the vnode for the filesystem instead of
                     93:  * the vnode for the directory as would happen in ufs. This is to insure we
                     94:  * retrieve the correct block from the buffer cache since the hash value is
                     95:  * based upon the vnode address and the desired block number.
                     96:  */
                     97:
                     98: /*
                     99:  * Create a regular file. On entry the directory to contain the file being
                    100:  * created is locked.  We must release before we return. We must also free
                    101:  * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or
                    102:  * only if the SAVESTART bit in cn_flags is clear on success.
                    103:  */
                    104: int
                    105: msdosfs_create(v)
                    106:        void *v;
                    107: {
                    108:        struct vop_create_args /* {
                    109:                struct vnode *a_dvp;
                    110:                struct vnode **a_vpp;
                    111:                struct componentname *a_cnp;
                    112:                struct vattr *a_vap;
                    113:        } */ *ap = v;
                    114:        struct componentname *cnp = ap->a_cnp;
                    115:        struct denode ndirent;
                    116:        struct denode *dep;
                    117:        struct denode *pdep = VTODE(ap->a_dvp);
                    118:        int error;
                    119:
                    120: #ifdef MSDOSFS_DEBUG
                    121:        printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap);
                    122: #endif
                    123:
                    124:        /*
                    125:         * If this is the root directory and there is no space left we
                    126:         * can't do anything.  This is because the root directory can not
                    127:         * change size.
                    128:         */
                    129:        if (pdep->de_StartCluster == MSDOSFSROOT
                    130:            && pdep->de_fndoffset >= pdep->de_FileSize) {
                    131:                error = ENOSPC;
                    132:                goto bad;
                    133:        }
                    134:
                    135:        /*
                    136:         * Create a directory entry for the file, then call createde() to
                    137:         * have it installed. NOTE: DOS files are always executable.  We
                    138:         * use the absence of the owner write bit to make the file
                    139:         * readonly.
                    140:         */
                    141: #ifdef DIAGNOSTIC
                    142:        if ((cnp->cn_flags & HASBUF) == 0)
                    143:                panic("msdosfs_create: no name");
                    144: #endif
                    145:        memset(&ndirent, 0, sizeof(ndirent));
                    146:        if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0)
                    147:                goto bad;
                    148:
                    149:        ndirent.de_Attributes = (ap->a_vap->va_mode & S_IWUSR) ?
                    150:                                ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY;
                    151:        ndirent.de_StartCluster = 0;
                    152:        ndirent.de_FileSize = 0;
                    153:        ndirent.de_dev = pdep->de_dev;
                    154:        ndirent.de_devvp = pdep->de_devvp;
                    155:        ndirent.de_pmp = pdep->de_pmp;
                    156:        ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1.20      christos  157:        DETIMES(&ndirent, NULL, NULL, NULL, pdep->de_pmp->pm_gmtoff);
1.1       jdolecek  158:        if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0)
                    159:                goto bad;
                    160:        if ((cnp->cn_flags & SAVESTART) == 0)
                    161:                PNBUF_PUT(cnp->cn_pnbuf);
                    162:        VN_KNOTE(ap->a_dvp, NOTE_WRITE);
                    163:        vput(ap->a_dvp);
                    164:        *ap->a_vpp = DETOV(dep);
                    165:        return (0);
                    166:
                    167: bad:
                    168:        PNBUF_PUT(cnp->cn_pnbuf);
                    169:        vput(ap->a_dvp);
                    170:        return (error);
                    171: }
                    172:
                    173: int
                    174: msdosfs_mknod(v)
                    175:        void *v;
                    176: {
                    177:        struct vop_mknod_args /* {
                    178:                struct vnode *a_dvp;
                    179:                struct vnode **a_vpp;
                    180:                struct componentname *a_cnp;
                    181:                struct vattr *a_vap;
                    182:        } */ *ap = v;
                    183:
                    184:        PNBUF_PUT(ap->a_cnp->cn_pnbuf);
                    185:        vput(ap->a_dvp);
                    186:        return (EINVAL);
                    187: }
                    188:
                    189: int
                    190: msdosfs_open(v)
                    191:        void *v;
                    192: {
                    193: #if 0
                    194:        struct vop_open_args /* {
                    195:                struct vnode *a_vp;
                    196:                int a_mode;
1.26.4.1  elad      197:                kauth_cred_t a_cred;
1.24      christos  198:                struct lwp *a_l;
1.1       jdolecek  199:        } */ *ap;
                    200: #endif
                    201:
                    202:        return (0);
                    203: }
                    204:
                    205: int
                    206: msdosfs_close(v)
                    207:        void *v;
                    208: {
                    209:        struct vop_close_args /* {
                    210:                struct vnode *a_vp;
                    211:                int a_fflag;
1.26.4.1  elad      212:                kauth_cred_t a_cred;
1.24      christos  213:                struct lwp *a_l;
1.1       jdolecek  214:        } */ *ap = v;
                    215:        struct vnode *vp = ap->a_vp;
                    216:        struct denode *dep = VTODE(vp);
                    217:
                    218:        simple_lock(&vp->v_interlock);
1.20      christos  219:        if (vp->v_usecount > 1)
                    220:                DETIMES(dep, NULL, NULL, NULL, dep->de_pmp->pm_gmtoff);
1.1       jdolecek  221:        simple_unlock(&vp->v_interlock);
                    222:        return (0);
                    223: }
                    224:
                    225: int
                    226: msdosfs_access(v)
                    227:        void *v;
                    228: {
                    229:        struct vop_access_args /* {
                    230:                struct vnode *a_vp;
                    231:                int a_mode;
1.26.4.1  elad      232:                kauth_cred_t a_cred;
1.24      christos  233:                struct lwp *a_l;
1.1       jdolecek  234:        } */ *ap = v;
                    235:        struct vnode *vp = ap->a_vp;
                    236:        struct denode *dep = VTODE(vp);
                    237:        struct msdosfsmount *pmp = dep->de_pmp;
                    238:        mode_t mode = ap->a_mode;
                    239:
                    240:        /*
                    241:         * Disallow write attempts on read-only file systems;
                    242:         * unless the file is a socket, fifo, or a block or
                    243:         * character device resident on the file system.
                    244:         */
                    245:        if (mode & VWRITE) {
                    246:                switch (vp->v_type) {
                    247:                case VDIR:
                    248:                case VLNK:
                    249:                case VREG:
                    250:                        if (vp->v_mount->mnt_flag & MNT_RDONLY)
                    251:                                return (EROFS);
                    252:                default:
                    253:                        break;
                    254:                }
                    255:        }
                    256:
                    257:        if ((dep->de_Attributes & ATTR_READONLY) == 0)
                    258:                mode = S_IRWXU|S_IRWXG|S_IRWXO;
                    259:        else
                    260:                mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
1.6       jdolecek  261:        return (vaccess(ap->a_vp->v_type,
                    262:            mode & (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask),
1.1       jdolecek  263:            pmp->pm_uid, pmp->pm_gid, ap->a_mode, ap->a_cred));
                    264: }
                    265:
                    266: int
                    267: msdosfs_getattr(v)
                    268:        void *v;
                    269: {
                    270:        struct vop_getattr_args /* {
                    271:                struct vnode *a_vp;
                    272:                struct vattr *a_vap;
1.26.4.1  elad      273:                kauth_cred_t a_cred;
1.24      christos  274:                struct lwp *a_l;
1.1       jdolecek  275:        } */ *ap = v;
                    276:        struct denode *dep = VTODE(ap->a_vp);
                    277:        struct msdosfsmount *pmp = dep->de_pmp;
                    278:        struct vattr *vap = ap->a_vap;
                    279:        mode_t mode;
                    280:        u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1.19      christos  281:        ino_t fileid;
1.1       jdolecek  282:
1.20      christos  283:        DETIMES(dep, NULL, NULL, NULL, pmp->pm_gmtoff);
1.1       jdolecek  284:        vap->va_fsid = dep->de_dev;
                    285:        /*
                    286:         * The following computation of the fileid must be the same as that
                    287:         * used in msdosfs_readdir() to compute d_fileno. If not, pwd
                    288:         * doesn't work.
                    289:         */
                    290:        if (dep->de_Attributes & ATTR_DIRECTORY) {
1.19      christos  291:                fileid = cntobn(pmp, (ino_t)dep->de_StartCluster) * dirsperblk;
1.1       jdolecek  292:                if (dep->de_StartCluster == MSDOSFSROOT)
                    293:                        fileid = 1;
                    294:        } else {
1.19      christos  295:                fileid = cntobn(pmp, (ino_t)dep->de_dirclust) * dirsperblk;
1.1       jdolecek  296:                if (dep->de_dirclust == MSDOSFSROOT)
                    297:                        fileid = roottobn(pmp, 0) * dirsperblk;
                    298:                fileid += dep->de_diroffset / sizeof(struct direntry);
                    299:        }
                    300:        vap->va_fileid = fileid;
                    301:        if ((dep->de_Attributes & ATTR_READONLY) == 0)
                    302:                mode = S_IRWXU|S_IRWXG|S_IRWXO;
                    303:        else
                    304:                mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
1.6       jdolecek  305:        vap->va_mode =
                    306:            mode & (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
1.1       jdolecek  307:        vap->va_uid = pmp->pm_uid;
                    308:        vap->va_gid = pmp->pm_gid;
                    309:        vap->va_nlink = 1;
                    310:        vap->va_rdev = 0;
                    311:        vap->va_size = ap->a_vp->v_size;
1.7       itojun    312:        dos2unixtime(dep->de_MDate, dep->de_MTime, 0, pmp->pm_gmtoff,
                    313:            &vap->va_mtime);
1.1       jdolecek  314:        if (dep->de_pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
1.7       itojun    315:                dos2unixtime(dep->de_ADate, 0, 0, pmp->pm_gmtoff,
                    316:                    &vap->va_atime);
                    317:                dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun,
                    318:                    pmp->pm_gmtoff, &vap->va_ctime);
1.1       jdolecek  319:        } else {
                    320:                vap->va_atime = vap->va_mtime;
                    321:                vap->va_ctime = vap->va_mtime;
                    322:        }
                    323:        vap->va_flags = 0;
                    324:        if ((dep->de_Attributes & ATTR_ARCHIVE) == 0)
                    325:                vap->va_mode  |= S_ARCH1;
                    326:        vap->va_gen = 0;
                    327:        vap->va_blocksize = pmp->pm_bpcluster;
                    328:        vap->va_bytes =
                    329:            (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
                    330:        vap->va_type = ap->a_vp->v_type;
                    331:        return (0);
                    332: }
                    333:
                    334: int
                    335: msdosfs_setattr(v)
                    336:        void *v;
                    337: {
                    338:        struct vop_setattr_args /* {
                    339:                struct vnode *a_vp;
                    340:                struct vattr *a_vap;
1.26.4.1  elad      341:                kauth_cred_t a_cred;
1.24      christos  342:                struct lwp *a_l;
1.1       jdolecek  343:        } */ *ap = v;
                    344:        int error = 0, de_changed = 0;
                    345:        struct denode *dep = VTODE(ap->a_vp);
                    346:        struct msdosfsmount *pmp = dep->de_pmp;
                    347:        struct vnode *vp  = ap->a_vp;
                    348:        struct vattr *vap = ap->a_vap;
1.26.4.1  elad      349:        kauth_cred_t cred = ap->a_cred;
1.1       jdolecek  350:
                    351: #ifdef MSDOSFS_DEBUG
                    352:        printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n",
1.24      christos  353:            ap->a_vp, vap, cred, ap->a_l);
1.1       jdolecek  354: #endif
                    355:        /*
                    356:         * Note we silently ignore uid or gid changes.
                    357:         */
                    358:        if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) ||
                    359:            (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
                    360:            (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
                    361:            (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL) ||
1.14      perry     362:            (vap->va_uid != VNOVAL && vap->va_uid != pmp->pm_uid) ||
1.1       jdolecek  363:            (vap->va_gid != VNOVAL && vap->va_gid != pmp->pm_gid)) {
                    364: #ifdef MSDOSFS_DEBUG
                    365:                printf("msdosfs_setattr(): returning EINVAL\n");
1.16      christos  366:                printf("    va_type %d, va_nlink %x, va_fsid %lx, va_fileid %llx\n",
                    367:                    vap->va_type, vap->va_nlink, vap->va_fsid,
                    368:                    (unsigned long long)vap->va_fileid);
1.1       jdolecek  369:                printf("    va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n",
                    370:                    vap->va_blocksize, vap->va_rdev, (long long)vap->va_bytes, vap->va_gen);
                    371: #endif
                    372:                return (EINVAL);
                    373:        }
                    374:        /*
                    375:         * Silently ignore attributes modifications on directories.
                    376:         */
                    377:        if (ap->a_vp->v_type == VDIR)
                    378:                return 0;
                    379:
                    380:        if (vap->va_size != VNOVAL) {
                    381:                if (vp->v_mount->mnt_flag & MNT_RDONLY)
                    382:                        return (EROFS);
1.24      christos  383:                error = detrunc(dep, (u_long)vap->va_size, 0, cred, ap->a_l);
1.1       jdolecek  384:                if (error)
                    385:                        return (error);
                    386:                de_changed = 1;
                    387:        }
                    388:        if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
                    389:                if (vp->v_mount->mnt_flag & MNT_RDONLY)
                    390:                        return (EROFS);
1.26.4.1  elad      391:                if (kauth_cred_geteuid(cred) != pmp->pm_uid &&
1.26.4.2! elad      392:                    (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER,
1.26.4.1  elad      393:                                               &ap->a_l->l_proc->p_acflag)) &&
1.1       jdolecek  394:                    ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
1.24      christos  395:                    (error = VOP_ACCESS(ap->a_vp, VWRITE, cred, ap->a_l))))
1.1       jdolecek  396:                        return (error);
                    397:                if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 &&
                    398:                    vap->va_atime.tv_sec != VNOVAL)
1.7       itojun    399:                        unix2dostime(&vap->va_atime, pmp->pm_gmtoff, &dep->de_ADate, NULL, NULL);
1.1       jdolecek  400:                if (vap->va_mtime.tv_sec != VNOVAL)
1.7       itojun    401:                        unix2dostime(&vap->va_mtime, pmp->pm_gmtoff, &dep->de_MDate, &dep->de_MTime, NULL);
1.1       jdolecek  402:                dep->de_Attributes |= ATTR_ARCHIVE;
                    403:                dep->de_flag |= DE_MODIFIED;
                    404:                de_changed = 1;
                    405:        }
                    406:        /*
                    407:         * DOS files only have the ability to have their writability
                    408:         * attribute set, so we use the owner write bit to set the readonly
                    409:         * attribute.
                    410:         */
                    411:        if (vap->va_mode != (mode_t)VNOVAL) {
                    412:                if (vp->v_mount->mnt_flag & MNT_RDONLY)
                    413:                        return (EROFS);
1.26.4.1  elad      414:                if (kauth_cred_geteuid(cred) != pmp->pm_uid &&
1.26.4.2! elad      415:                    (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER,
1.26.4.1  elad      416:                                               &ap->a_l->l_proc->p_acflag)))
1.1       jdolecek  417:                        return (error);
                    418:                /* We ignore the read and execute bits. */
                    419:                if (vap->va_mode & S_IWUSR)
                    420:                        dep->de_Attributes &= ~ATTR_READONLY;
                    421:                else
                    422:                        dep->de_Attributes |= ATTR_READONLY;
                    423:                dep->de_flag |= DE_MODIFIED;
                    424:                de_changed = 1;
                    425:        }
                    426:        /*
                    427:         * Allow the `archived' bit to be toggled.
                    428:         */
                    429:        if (vap->va_flags != VNOVAL) {
                    430:                if (vp->v_mount->mnt_flag & MNT_RDONLY)
                    431:                        return (EROFS);
1.26.4.1  elad      432:                if (kauth_cred_geteuid(cred) != pmp->pm_uid &&
1.26.4.2! elad      433:                    (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER,
1.26.4.1  elad      434:                                             &ap->a_l->l_proc->p_acflag)))
1.1       jdolecek  435:                        return (error);
                    436:                if (vap->va_flags & SF_ARCHIVED)
                    437:                        dep->de_Attributes &= ~ATTR_ARCHIVE;
                    438:                else
                    439:                        dep->de_Attributes |= ATTR_ARCHIVE;
                    440:                dep->de_flag |= DE_MODIFIED;
                    441:                de_changed = 1;
                    442:        }
                    443:
                    444:        if (de_changed) {
                    445:                VN_KNOTE(vp, NOTE_ATTRIB);
                    446:                return (deupdat(dep, 1));
                    447:        } else
                    448:                return (0);
                    449: }
                    450:
                    451: int
                    452: msdosfs_read(v)
                    453:        void *v;
                    454: {
                    455:        struct vop_read_args /* {
                    456:                struct vnode *a_vp;
                    457:                struct uio *a_uio;
                    458:                int a_ioflag;
1.26.4.1  elad      459:                kauth_cred_t a_cred;
1.1       jdolecek  460:        } */ *ap = v;
1.13      chs       461:        int error = 0, flags;
1.1       jdolecek  462:        int64_t diff;
                    463:        int blsize;
                    464:        long n;
                    465:        long on;
                    466:        daddr_t lbn;
                    467:        void *win;
                    468:        vsize_t bytelen;
                    469:        struct buf *bp;
                    470:        struct vnode *vp = ap->a_vp;
                    471:        struct denode *dep = VTODE(vp);
                    472:        struct msdosfsmount *pmp = dep->de_pmp;
                    473:        struct uio *uio = ap->a_uio;
                    474:
                    475:        /*
                    476:         * If they didn't ask for any data, then we are done.
                    477:         */
                    478:
                    479:        if (uio->uio_resid == 0)
                    480:                return (0);
                    481:        if (uio->uio_offset < 0)
                    482:                return (EINVAL);
                    483:        if (uio->uio_offset >= dep->de_FileSize)
                    484:                return (0);
                    485:
                    486:        if (vp->v_type == VREG) {
1.23      yamt      487:                const int advice = IO_ADV_DECODE(ap->a_ioflag);
                    488:
1.1       jdolecek  489:                while (uio->uio_resid > 0) {
                    490:                        bytelen = MIN(dep->de_FileSize - uio->uio_offset,
                    491:                                      uio->uio_resid);
                    492:
                    493:                        if (bytelen == 0)
                    494:                                break;
                    495:                        win = ubc_alloc(&vp->v_uobj, uio->uio_offset,
1.23      yamt      496:                                        &bytelen, advice, UBC_READ);
1.1       jdolecek  497:                        error = uiomove(win, bytelen, uio);
1.13      chs       498:                        flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0;
                    499:                        ubc_release(win, flags);
1.1       jdolecek  500:                        if (error)
                    501:                                break;
                    502:                }
                    503:                dep->de_flag |= DE_ACCESS;
                    504:                goto out;
                    505:        }
                    506:
                    507:        /* this loop is only for directories now */
                    508:        do {
                    509:                lbn = de_cluster(pmp, uio->uio_offset);
                    510:                on = uio->uio_offset & pmp->pm_crbomask;
                    511:                n = MIN(pmp->pm_bpcluster - on, uio->uio_resid);
                    512:                if (uio->uio_offset >= dep->de_FileSize)
                    513:                        return (0);
                    514:                /* file size (and hence diff) may be up to 4GB */
                    515:                diff = dep->de_FileSize - uio->uio_offset;
                    516:                if (diff < n)
                    517:                        n = (long) diff;
                    518:
                    519:                /* convert cluster # to block # */
                    520:                error = pcbmap(dep, lbn, &lbn, 0, &blsize);
                    521:                if (error)
                    522:                        return (error);
                    523:
                    524:                /*
                    525:                 * If we are operating on a directory file then be sure to
                    526:                 * do i/o with the vnode for the filesystem instead of the
                    527:                 * vnode for the directory.
                    528:                 */
                    529:                error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp);
                    530:                n = MIN(n, pmp->pm_bpcluster - bp->b_resid);
                    531:                if (error) {
                    532:                        brelse(bp);
                    533:                        return (error);
                    534:                }
                    535:                error = uiomove(bp->b_data + on, (int) n, uio);
                    536:                brelse(bp);
                    537:        } while (error == 0 && uio->uio_resid > 0 && n != 0);
1.14      perry     538:
1.1       jdolecek  539: out:
                    540:        if ((ap->a_ioflag & IO_SYNC) == IO_SYNC)
                    541:                error = deupdat(dep, 1);
                    542:        return (error);
                    543: }
                    544:
                    545: /*
                    546:  * Write data to a file or directory.
                    547:  */
                    548: int
                    549: msdosfs_write(v)
                    550:        void *v;
                    551: {
                    552:        struct vop_write_args /* {
                    553:                struct vnode *a_vp;
                    554:                struct uio *a_uio;
                    555:                int a_ioflag;
1.26.4.1  elad      556:                kauth_cred_t a_cred;
1.1       jdolecek  557:        } */ *ap = v;
1.13      chs       558:        int resid, flags, extended = 0;
                    559:        int error = 0;
                    560:        int ioflag = ap->a_ioflag;
1.1       jdolecek  561:        u_long osize;
                    562:        u_long count;
                    563:        void *win;
                    564:        vsize_t bytelen;
                    565:        off_t oldoff;
                    566:        struct uio *uio = ap->a_uio;
1.26      yamt      567:        struct proc *p = curproc;
1.1       jdolecek  568:        struct vnode *vp = ap->a_vp;
                    569:        struct denode *dep = VTODE(vp);
                    570:        struct msdosfsmount *pmp = dep->de_pmp;
1.26.4.1  elad      571:        kauth_cred_t cred = ap->a_cred;
1.1       jdolecek  572:        boolean_t async;
                    573:
                    574: #ifdef MSDOSFS_DEBUG
                    575:        printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
                    576:            vp, uio, ioflag, cred);
                    577:        printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
                    578:            dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
                    579: #endif
                    580:
                    581:        switch (vp->v_type) {
                    582:        case VREG:
                    583:                if (ioflag & IO_APPEND)
                    584:                        uio->uio_offset = dep->de_FileSize;
                    585:                break;
                    586:        case VDIR:
                    587:                return EISDIR;
                    588:        default:
                    589:                panic("msdosfs_write(): bad file type");
                    590:        }
                    591:
                    592:        if (uio->uio_offset < 0)
                    593:                return (EINVAL);
                    594:
                    595:        if (uio->uio_resid == 0)
                    596:                return (0);
                    597:
1.17      xtraeme   598:        /* Don't bother to try to write files larger than the fs limit */
                    599:        if (uio->uio_offset + uio->uio_resid > MSDOSFS_FILESIZE_MAX)
                    600:                return (EFBIG);
                    601:
1.1       jdolecek  602:        /*
                    603:         * If they've exceeded their filesize limit, tell them about it.
                    604:         */
1.26      yamt      605:        if (((uio->uio_offset + uio->uio_resid) >
1.1       jdolecek  606:            p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) {
                    607:                psignal(p, SIGXFSZ);
                    608:                return (EFBIG);
                    609:        }
                    610:
                    611:        /*
                    612:         * If the offset we are starting the write at is beyond the end of
                    613:         * the file, then they've done a seek.  Unix filesystems allow
                    614:         * files with holes in them, DOS doesn't so we must fill the hole
                    615:         * with zeroed blocks.
                    616:         */
                    617:        if (uio->uio_offset > dep->de_FileSize) {
                    618:                if ((error = deextend(dep, uio->uio_offset, cred)) != 0)
                    619:                        return (error);
                    620:        }
                    621:
                    622:        /*
                    623:         * Remember some values in case the write fails.
                    624:         */
                    625:        async = vp->v_mount->mnt_flag & MNT_ASYNC;
                    626:        resid = uio->uio_resid;
                    627:        osize = dep->de_FileSize;
                    628:
                    629:        /*
                    630:         * If we write beyond the end of the file, extend it to its ultimate
                    631:         * size ahead of the time to hopefully get a contiguous area.
                    632:         */
                    633:        if (uio->uio_offset + resid > osize) {
                    634:                count = de_clcount(pmp, uio->uio_offset + resid) -
                    635:                        de_clcount(pmp, osize);
                    636:                if ((error = extendfile(dep, count, NULL, NULL, 0)) &&
                    637:                    (error != ENOSPC || (ioflag & IO_UNIT)))
                    638:                        goto errexit;
                    639:        }
                    640:
                    641:        if (dep->de_FileSize < uio->uio_offset + resid) {
                    642:                dep->de_FileSize = uio->uio_offset + resid;
                    643:                uvm_vnp_setsize(vp, dep->de_FileSize);
                    644:                extended = 1;
                    645:        }
                    646:
                    647:        do {
                    648:                oldoff = uio->uio_offset;
                    649:                bytelen = uio->uio_resid;
                    650:
1.23      yamt      651:                win = ubc_alloc(&vp->v_uobj, oldoff, &bytelen, UVM_ADV_NORMAL,
                    652:                    UBC_WRITE);
1.1       jdolecek  653:                error = uiomove(win, bytelen, uio);
1.13      chs       654:                flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0;
                    655:                ubc_release(win, flags);
1.1       jdolecek  656:                if (error) {
                    657:                        break;
                    658:                }
                    659:
                    660:                /*
                    661:                 * flush what we just wrote if necessary.
                    662:                 * XXXUBC simplistic async flushing.
                    663:                 */
                    664:
                    665:                if (!async && oldoff >> 16 != uio->uio_offset >> 16) {
                    666:                        simple_lock(&vp->v_interlock);
                    667:                        error = VOP_PUTPAGES(vp, (oldoff >> 16) << 16,
                    668:                            (uio->uio_offset >> 16) << 16, PGO_CLEANIT);
                    669:                }
                    670:        } while (error == 0 && uio->uio_resid > 0);
                    671:        if (error == 0 && ioflag & IO_SYNC) {
                    672:                simple_lock(&vp->v_interlock);
                    673:                error = VOP_PUTPAGES(vp, trunc_page(oldoff),
                    674:                    round_page(oldoff + bytelen), PGO_CLEANIT | PGO_SYNCIO);
                    675:        }
                    676:        dep->de_flag |= DE_UPDATE;
                    677:
                    678:        /*
                    679:         * If the write failed and they want us to, truncate the file back
                    680:         * to the size it was before the write was attempted.
                    681:         */
                    682: errexit:
                    683:        if (resid > uio->uio_resid)
                    684:                VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0));
                    685:        if (error) {
                    686:                detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL);
                    687:                uio->uio_offset -= resid - uio->uio_resid;
                    688:                uio->uio_resid = resid;
                    689:        } else if ((ioflag & IO_SYNC) == IO_SYNC)
                    690:                error = deupdat(dep, 1);
                    691:        KASSERT(vp->v_size == dep->de_FileSize);
                    692:        return (error);
                    693: }
                    694:
                    695: int
1.21      yamt      696: msdosfs_update(struct vnode *vp, const struct timespec *acc,
                    697:     const struct timespec *mod, int flags)
1.1       jdolecek  698: {
                    699:        struct buf *bp;
                    700:        struct direntry *dirp;
                    701:        struct denode *dep;
                    702:        int error;
                    703:
1.21      yamt      704:        if (vp->v_mount->mnt_flag & MNT_RDONLY)
1.1       jdolecek  705:                return (0);
1.21      yamt      706:        dep = VTODE(vp);
                    707:        DETIMES(dep, acc, mod, NULL, dep->de_pmp->pm_gmtoff);
1.1       jdolecek  708:        if ((dep->de_flag & DE_MODIFIED) == 0)
                    709:                return (0);
                    710:        dep->de_flag &= ~DE_MODIFIED;
                    711:        if (dep->de_Attributes & ATTR_DIRECTORY)
                    712:                return (0);
                    713:        if (dep->de_refcnt <= 0)
                    714:                return (0);
                    715:        error = readde(dep, &bp, &dirp);
                    716:        if (error)
                    717:                return (error);
                    718:        DE_EXTERNALIZE(dirp, dep);
1.21      yamt      719:        if (flags & (UPDATE_WAIT|UPDATE_DIROP))
1.1       jdolecek  720:                return (bwrite(bp));
                    721:        else {
                    722:                bdwrite(bp);
                    723:                return (0);
                    724:        }
                    725: }
                    726:
                    727: /*
                    728:  * Flush the blocks of a file to disk.
                    729:  *
                    730:  * This function is worthless for vnodes that represent directories. Maybe we
                    731:  * could just do a sync if they try an fsync on a directory file.
                    732:  */
                    733: int
                    734: msdosfs_remove(v)
                    735:        void *v;
                    736: {
                    737:        struct vop_remove_args /* {
                    738:                struct vnode *a_dvp;
                    739:                struct vnode *a_vp;
                    740:                struct componentname *a_cnp;
                    741:        } */ *ap = v;
                    742:        struct denode *dep = VTODE(ap->a_vp);
                    743:        struct denode *ddep = VTODE(ap->a_dvp);
                    744:        int error;
                    745:
                    746:        if (ap->a_vp->v_type == VDIR)
                    747:                error = EPERM;
                    748:        else
                    749:                error = removede(ddep, dep);
                    750: #ifdef MSDOSFS_DEBUG
                    751:        printf("msdosfs_remove(), dep %p, v_usecount %d\n",
                    752:                dep, ap->a_vp->v_usecount);
                    753: #endif
                    754:        VN_KNOTE(ap->a_vp, NOTE_DELETE);
                    755:        VN_KNOTE(ap->a_dvp, NOTE_WRITE);
                    756:        if (ddep == dep)
                    757:                vrele(ap->a_vp);
                    758:        else
                    759:                vput(ap->a_vp); /* causes msdosfs_inactive() to be called
                    760:                                 * via vrele() */
                    761:        vput(ap->a_dvp);
                    762:        return (error);
                    763: }
                    764:
                    765: /*
                    766:  * DOS filesystems don't know what links are. But since we already called
                    767:  * msdosfs_lookup() with create and lockparent, the parent is locked so we
                    768:  * have to free it before we return the error.
                    769:  */
                    770: int
                    771: msdosfs_link(v)
                    772:        void *v;
                    773: {
                    774:        struct vop_link_args /* {
                    775:                struct vnode *a_dvp;
                    776:                struct vnode *a_vp;
                    777:                struct componentname *a_cnp;
                    778:        } */ *ap = v;
                    779:
                    780:        VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
                    781:        vput(ap->a_dvp);
                    782:        return (EOPNOTSUPP);
                    783: }
                    784:
                    785: /*
                    786:  * Renames on files require moving the denode to a new hash queue since the
                    787:  * denode's location is used to compute which hash queue to put the file
                    788:  * in. Unless it is a rename in place.  For example "mv a b".
                    789:  *
                    790:  * What follows is the basic algorithm:
                    791:  *
                    792:  * if (file move) {
                    793:  *     if (dest file exists) {
                    794:  *             remove dest file
                    795:  *     }
                    796:  *     if (dest and src in same directory) {
                    797:  *             rewrite name in existing directory slot
                    798:  *     } else {
                    799:  *             write new entry in dest directory
                    800:  *             update offset and dirclust in denode
                    801:  *             move denode to new hash chain
                    802:  *             clear old directory entry
                    803:  *     }
                    804:  * } else {
                    805:  *     directory move
                    806:  *     if (dest directory exists) {
                    807:  *             if (dest is not empty) {
                    808:  *                     return ENOTEMPTY
                    809:  *             }
                    810:  *             remove dest directory
                    811:  *     }
                    812:  *     if (dest and src in same directory) {
                    813:  *             rewrite name in existing entry
                    814:  *     } else {
                    815:  *             be sure dest is not a child of src directory
                    816:  *             write entry in dest directory
                    817:  *             update "." and ".." in moved directory
                    818:  *             update offset and dirclust in denode
                    819:  *             move denode to new hash chain
                    820:  *             clear old directory entry for moved directory
                    821:  *     }
                    822:  * }
                    823:  *
                    824:  * On entry:
                    825:  *     source's parent directory is unlocked
                    826:  *     source file or directory is unlocked
                    827:  *     destination's parent directory is locked
                    828:  *     destination file or directory is locked if it exists
                    829:  *
                    830:  * On exit:
                    831:  *     all denodes should be released
                    832:  *
                    833:  * Notes:
                    834:  * I'm not sure how the memory containing the pathnames pointed at by the
                    835:  * componentname structures is freed, there may be some memory bleeding
                    836:  * for each rename done.
                    837:  */
                    838: int
                    839: msdosfs_rename(v)
                    840:        void *v;
                    841: {
                    842:        struct vop_rename_args /* {
                    843:                struct vnode *a_fdvp;
                    844:                struct vnode *a_fvp;
                    845:                struct componentname *a_fcnp;
                    846:                struct vnode *a_tdvp;
                    847:                struct vnode *a_tvp;
                    848:                struct componentname *a_tcnp;
                    849:        } */ *ap = v;
                    850:        struct vnode *tvp = ap->a_tvp;
                    851:        struct vnode *tdvp = ap->a_tdvp;
                    852:        struct vnode *fvp = ap->a_fvp;
                    853:        struct vnode *fdvp = ap->a_fdvp;
                    854:        struct componentname *tcnp = ap->a_tcnp;
                    855:        struct componentname *fcnp = ap->a_fcnp;
1.24      christos  856:        struct lwp *l = tcnp->cn_lwp;
1.1       jdolecek  857:        struct denode *ip, *xp, *dp, *zp;
                    858:        u_char toname[11], oldname[11];
                    859:        u_long from_diroffset, to_diroffset;
                    860:        u_char to_count;
                    861:        int doingdirectory = 0, newparent = 0;
                    862:        int error;
                    863:        u_long cn;
                    864:        daddr_t bn;
                    865:        struct msdosfsmount *pmp;
                    866:        struct direntry *dotdotp;
                    867:        struct buf *bp;
                    868:        int fdvp_dorele = 0;
                    869:
                    870:        pmp = VFSTOMSDOSFS(fdvp->v_mount);
                    871:
                    872: #ifdef DIAGNOSTIC
                    873:        if ((tcnp->cn_flags & HASBUF) == 0 ||
                    874:            (fcnp->cn_flags & HASBUF) == 0)
                    875:                panic("msdosfs_rename: no name");
                    876: #endif
                    877:        /*
                    878:         * Check for cross-device rename.
                    879:         */
                    880:        if ((fvp->v_mount != tdvp->v_mount) ||
                    881:            (tvp && (fvp->v_mount != tvp->v_mount))) {
                    882:                error = EXDEV;
                    883: abortit:
                    884:                VOP_ABORTOP(tdvp, tcnp);
                    885:                if (tdvp == tvp)
                    886:                        vrele(tdvp);
                    887:                else
                    888:                        vput(tdvp);
                    889:                if (tvp)
                    890:                        vput(tvp);
                    891:                VOP_ABORTOP(fdvp, fcnp);
                    892:                vrele(fdvp);
                    893:                vrele(fvp);
                    894:                return (error);
                    895:        }
                    896:
                    897:        /*
                    898:         * If source and dest are the same, do nothing.
                    899:         */
                    900:        if (tvp == fvp) {
                    901:                error = 0;
                    902:                goto abortit;
                    903:        }
                    904:
                    905:        /* */
                    906:        if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
                    907:                goto abortit;
                    908:        dp = VTODE(fdvp);
                    909:        ip = VTODE(fvp);
                    910:
                    911:        /*
                    912:         * Be sure we are not renaming ".", "..", or an alias of ".". This
                    913:         * leads to a crippled directory tree.  It's pretty tough to do a
                    914:         * "ls" or "pwd" with the "." directory entry missing, and "cd .."
                    915:         * doesn't work if the ".." entry is missing.
                    916:         */
                    917:        if (ip->de_Attributes & ATTR_DIRECTORY) {
                    918:                /*
                    919:                 * Avoid ".", "..", and aliases of "." for obvious reasons.
                    920:                 */
                    921:                if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
                    922:                    dp == ip ||
                    923:                    (fcnp->cn_flags & ISDOTDOT) ||
                    924:                    (tcnp->cn_flags & ISDOTDOT) ||
                    925:                    (ip->de_flag & DE_RENAME)) {
                    926:                        VOP_UNLOCK(fvp, 0);
                    927:                        error = EINVAL;
                    928:                        goto abortit;
                    929:                }
                    930:                ip->de_flag |= DE_RENAME;
                    931:                doingdirectory++;
                    932:        }
                    933:        VN_KNOTE(fdvp, NOTE_WRITE);             /* XXXLUKEM/XXX: right place? */
                    934:
                    935:        /*
                    936:         * When the target exists, both the directory
                    937:         * and target vnodes are returned locked.
                    938:         */
                    939:        dp = VTODE(tdvp);
                    940:        xp = tvp ? VTODE(tvp) : NULL;
                    941:        /*
                    942:         * Remember direntry place to use for destination
                    943:         */
                    944:        to_diroffset = dp->de_fndoffset;
                    945:        to_count = dp->de_fndcnt;
                    946:
                    947:        /*
                    948:         * If ".." must be changed (ie the directory gets a new
                    949:         * parent) then the source directory must not be in the
                    950:         * directory hierarchy above the target, as this would
                    951:         * orphan everything below the source directory. Also
                    952:         * the user must have write permission in the source so
                    953:         * as to be able to change "..". We must repeat the call
                    954:         * to namei, as the parent directory is unlocked by the
                    955:         * call to doscheckpath().
                    956:         */
1.24      christos  957:        error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, l);
1.1       jdolecek  958:        VOP_UNLOCK(fvp, 0);
                    959:        if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
                    960:                newparent = 1;
                    961:        vrele(fdvp);
                    962:        if (doingdirectory && newparent) {
                    963:                if (error)      /* write access check above */
                    964:                        goto bad;
                    965:                if (xp != NULL)
                    966:                        vput(tvp);
                    967:                /*
                    968:                 * doscheckpath() vput()'s dp,
                    969:                 * so we have to do a relookup afterwards
                    970:                 */
                    971:                if ((error = doscheckpath(ip, dp)) != 0)
                    972:                        goto out;
                    973:                if ((tcnp->cn_flags & SAVESTART) == 0)
                    974:                        panic("msdosfs_rename: lost to startdir");
                    975:                if ((error = relookup(tdvp, &tvp, tcnp)) != 0)
                    976:                        goto out;
                    977:                dp = VTODE(tdvp);
                    978:                xp = tvp ? VTODE(tvp) : NULL;
                    979:        }
                    980:
                    981:        if (xp != NULL) {
                    982:                /*
                    983:                 * Target must be empty if a directory and have no links
                    984:                 * to it. Also, ensure source and target are compatible
                    985:                 * (both directories, or both not directories).
                    986:                 */
                    987:                if (xp->de_Attributes & ATTR_DIRECTORY) {
                    988:                        if (!dosdirempty(xp)) {
                    989:                                error = ENOTEMPTY;
                    990:                                goto bad;
                    991:                        }
                    992:                        if (!doingdirectory) {
                    993:                                error = ENOTDIR;
                    994:                                goto bad;
                    995:                        }
                    996:                } else if (doingdirectory) {
                    997:                        error = EISDIR;
                    998:                        goto bad;
                    999:                }
                   1000:                if ((error = removede(dp, xp)) != 0)
                   1001:                        goto bad;
                   1002:                VN_KNOTE(tdvp, NOTE_WRITE);
                   1003:                VN_KNOTE(tvp, NOTE_DELETE);
                   1004:                cache_purge(tvp);
                   1005:                vput(tvp);
                   1006:                xp = NULL;
                   1007:        }
                   1008:
                   1009:        /*
                   1010:         * Convert the filename in tcnp into a dos filename. We copy this
                   1011:         * into the denode and directory entry for the destination
                   1012:         * file/directory.
                   1013:         */
                   1014:        if ((error = uniqdosname(VTODE(tdvp), tcnp, toname)) != 0)
                   1015:                goto abortit;
                   1016:
                   1017:        /*
                   1018:         * Since from wasn't locked at various places above,
                   1019:         * have to do a relookup here.
                   1020:         */
                   1021:        fcnp->cn_flags &= ~MODMASK;
                   1022:        fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
                   1023:        if ((fcnp->cn_flags & SAVESTART) == 0)
                   1024:                panic("msdosfs_rename: lost from startdir");
                   1025:        if (!newparent)
                   1026:                VOP_UNLOCK(tdvp, 0);
                   1027:        (void) relookup(fdvp, &fvp, fcnp);
                   1028:        if (fvp == NULL) {
                   1029:                /*
                   1030:                 * From name has disappeared.
                   1031:                 */
                   1032:                if (doingdirectory)
                   1033:                        panic("rename: lost dir entry");
                   1034:                vrele(ap->a_fvp);
                   1035:                if (newparent)
                   1036:                        VOP_UNLOCK(tdvp, 0);
                   1037:                vrele(tdvp);
                   1038:                return 0;
                   1039:        }
                   1040:        fdvp_dorele = 1;
                   1041:        xp = VTODE(fvp);
                   1042:        zp = VTODE(fdvp);
                   1043:        from_diroffset = zp->de_fndoffset;
                   1044:
                   1045:        /*
                   1046:         * Ensure that the directory entry still exists and has not
                   1047:         * changed till now. If the source is a file the entry may
                   1048:         * have been unlinked or renamed. In either case there is
                   1049:         * no further work to be done. If the source is a directory
                   1050:         * then it cannot have been rmdir'ed or renamed; this is
                   1051:         * prohibited by the DE_RENAME flag.
                   1052:         */
                   1053:        if (xp != ip) {
                   1054:                if (doingdirectory)
                   1055:                        panic("rename: lost dir entry");
                   1056:                vrele(ap->a_fvp);
                   1057:                VOP_UNLOCK(fvp, 0);
                   1058:                if (newparent)
                   1059:                        VOP_UNLOCK(fdvp, 0);
                   1060:                xp = NULL;
                   1061:        } else {
                   1062:                vrele(fvp);
                   1063:                xp = NULL;
                   1064:
                   1065:                /*
                   1066:                 * First write a new entry in the destination
                   1067:                 * directory and mark the entry in the source directory
                   1068:                 * as deleted.  Then move the denode to the correct hash
                   1069:                 * chain for its new location in the filesystem.  And, if
                   1070:                 * we moved a directory, then update its .. entry to point
                   1071:                 * to the new parent directory.
                   1072:                 */
                   1073:                memcpy(oldname, ip->de_Name, 11);
                   1074:                memcpy(ip->de_Name, toname, 11);        /* update denode */
                   1075:                dp->de_fndoffset = to_diroffset;
                   1076:                dp->de_fndcnt = to_count;
                   1077:                error = createde(ip, dp, (struct denode **)0, tcnp);
                   1078:                if (error) {
                   1079:                        memcpy(ip->de_Name, oldname, 11);
                   1080:                        if (newparent)
                   1081:                                VOP_UNLOCK(fdvp, 0);
                   1082:                        VOP_UNLOCK(fvp, 0);
                   1083:                        goto bad;
                   1084:                }
                   1085:                ip->de_refcnt++;
                   1086:                zp->de_fndoffset = from_diroffset;
                   1087:                if ((error = removede(zp, ip)) != 0) {
                   1088:                        /* XXX should really panic here, fs is corrupt */
                   1089:                        if (newparent)
                   1090:                                VOP_UNLOCK(fdvp, 0);
                   1091:                        VOP_UNLOCK(fvp, 0);
                   1092:                        goto bad;
                   1093:                }
                   1094:                cache_purge(fvp);
                   1095:                if (!doingdirectory) {
                   1096:                        error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0,
                   1097:                                       &ip->de_dirclust, 0);
                   1098:                        if (error) {
                   1099:                                /* XXX should really panic here, fs is corrupt */
                   1100:                                if (newparent)
                   1101:                                        VOP_UNLOCK(fdvp, 0);
                   1102:                                VOP_UNLOCK(fvp, 0);
                   1103:                                goto bad;
                   1104:                        }
                   1105:                        ip->de_diroffset = to_diroffset;
                   1106:                        if (ip->de_dirclust != MSDOSFSROOT)
                   1107:                                ip->de_diroffset &= pmp->pm_crbomask;
                   1108:                }
                   1109:                reinsert(ip);
                   1110:                if (newparent)
                   1111:                        VOP_UNLOCK(fdvp, 0);
                   1112:        }
                   1113:
                   1114:        /*
                   1115:         * If we moved a directory to a new parent directory, then we must
                   1116:         * fixup the ".." entry in the moved directory.
                   1117:         */
                   1118:        if (doingdirectory && newparent) {
                   1119:                cn = ip->de_StartCluster;
                   1120:                if (cn == MSDOSFSROOT) {
                   1121:                        /* this should never happen */
                   1122:                        panic("msdosfs_rename: updating .. in root directory?");
                   1123:                } else
                   1124:                        bn = cntobn(pmp, cn);
                   1125:                error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
                   1126:                              NOCRED, &bp);
                   1127:                if (error) {
                   1128:                        /* XXX should really panic here, fs is corrupt */
                   1129:                        brelse(bp);
                   1130:                        VOP_UNLOCK(fvp, 0);
                   1131:                        goto bad;
                   1132:                }
                   1133:                dotdotp = (struct direntry *)bp->b_data + 1;
                   1134:                putushort(dotdotp->deStartCluster, dp->de_StartCluster);
                   1135:                if (FAT32(pmp)) {
                   1136:                        putushort(dotdotp->deHighClust,
                   1137:                                dp->de_StartCluster >> 16);
1.22      christos 1138:                } else {
                   1139:                        putushort(dotdotp->deHighClust, 0);
1.1       jdolecek 1140:                }
                   1141:                if ((error = bwrite(bp)) != 0) {
                   1142:                        /* XXX should really panic here, fs is corrupt */
                   1143:                        VOP_UNLOCK(fvp, 0);
                   1144:                        goto bad;
                   1145:                }
                   1146:        }
                   1147:
                   1148:        VN_KNOTE(fvp, NOTE_RENAME);
                   1149:        VOP_UNLOCK(fvp, 0);
                   1150: bad:
                   1151:        if (xp)
                   1152:                vput(tvp);
                   1153:        vput(tdvp);
                   1154: out:
                   1155:        ip->de_flag &= ~DE_RENAME;
                   1156:        if (fdvp_dorele)
                   1157:                vrele(fdvp);
                   1158:        vrele(fvp);
                   1159:        return (error);
                   1160:
                   1161: }
                   1162:
1.2       jdolecek 1163: static const struct {
1.1       jdolecek 1164:        struct direntry dot;
                   1165:        struct direntry dotdot;
                   1166: } dosdirtemplate = {
                   1167:        {       ".       ", "   ",                      /* the . entry */
                   1168:                ATTR_DIRECTORY,                         /* file attribute */
                   1169:                0,                                      /* reserved */
                   1170:                0, { 0, 0 }, { 0, 0 },                  /* create time & date */
                   1171:                { 0, 0 },                               /* access date */
                   1172:                { 0, 0 },                               /* high bits of start cluster */
                   1173:                { 210, 4 }, { 210, 4 },                 /* modify time & date */
                   1174:                { 0, 0 },                               /* startcluster */
                   1175:                { 0, 0, 0, 0 }                          /* filesize */
                   1176:        },
                   1177:        {       "..      ", "   ",                      /* the .. entry */
                   1178:                ATTR_DIRECTORY,                         /* file attribute */
                   1179:                0,                                      /* reserved */
                   1180:                0, { 0, 0 }, { 0, 0 },                  /* create time & date */
                   1181:                { 0, 0 },                               /* access date */
                   1182:                { 0, 0 },                               /* high bits of start cluster */
                   1183:                { 210, 4 }, { 210, 4 },                 /* modify time & date */
                   1184:                { 0, 0 },                               /* startcluster */
                   1185:                { 0, 0, 0, 0 }                          /* filesize */
                   1186:        }
                   1187: };
                   1188:
                   1189: int
                   1190: msdosfs_mkdir(v)
                   1191:        void *v;
                   1192: {
                   1193:        struct vop_mkdir_args /* {
                   1194:                struct vnode *a_dvp;
                   1195:                struvt vnode **a_vpp;
                   1196:                struvt componentname *a_cnp;
                   1197:                struct vattr *a_vap;
                   1198:        } */ *ap = v;
                   1199:        struct componentname *cnp = ap->a_cnp;
                   1200:        struct denode ndirent;
                   1201:        struct denode *dep;
                   1202:        struct denode *pdep = VTODE(ap->a_dvp);
                   1203:        int error;
                   1204:        int bn;
                   1205:        u_long newcluster, pcl;
                   1206:        struct direntry *denp;
                   1207:        struct msdosfsmount *pmp = pdep->de_pmp;
                   1208:        struct buf *bp;
                   1209:        int async = pdep->de_pmp->pm_mountp->mnt_flag & MNT_ASYNC;
                   1210:
                   1211:        /*
                   1212:         * If this is the root directory and there is no space left we
                   1213:         * can't do anything.  This is because the root directory can not
                   1214:         * change size.
                   1215:         */
                   1216:        if (pdep->de_StartCluster == MSDOSFSROOT
                   1217:            && pdep->de_fndoffset >= pdep->de_FileSize) {
                   1218:                error = ENOSPC;
                   1219:                goto bad2;
                   1220:        }
                   1221:
                   1222:        /*
                   1223:         * Allocate a cluster to hold the about to be created directory.
                   1224:         */
                   1225:        error = clusteralloc(pmp, 0, 1, &newcluster, NULL);
                   1226:        if (error)
                   1227:                goto bad2;
                   1228:
                   1229:        memset(&ndirent, 0, sizeof(ndirent));
                   1230:        ndirent.de_pmp = pmp;
                   1231:        ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1.20      christos 1232:        DETIMES(&ndirent, NULL, NULL, NULL, pmp->pm_gmtoff);
1.1       jdolecek 1233:
                   1234:        /*
                   1235:         * Now fill the cluster with the "." and ".." entries. And write
                   1236:         * the cluster to disk.  This way it is there for the parent
                   1237:         * directory to be pointing at if there were a crash.
                   1238:         */
                   1239:        bn = cntobn(pmp, newcluster);
                   1240:        /* always succeeds */
                   1241:        bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0);
                   1242:        memset(bp->b_data, 0, pmp->pm_bpcluster);
                   1243:        memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate);
                   1244:        denp = (struct direntry *)bp->b_data;
                   1245:        putushort(denp[0].deStartCluster, newcluster);
                   1246:        putushort(denp[0].deCDate, ndirent.de_CDate);
                   1247:        putushort(denp[0].deCTime, ndirent.de_CTime);
                   1248:        denp[0].deCHundredth = ndirent.de_CHun;
                   1249:        putushort(denp[0].deADate, ndirent.de_ADate);
                   1250:        putushort(denp[0].deMDate, ndirent.de_MDate);
                   1251:        putushort(denp[0].deMTime, ndirent.de_MTime);
                   1252:        pcl = pdep->de_StartCluster;
                   1253:        if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
                   1254:                pcl = 0;
                   1255:        putushort(denp[1].deStartCluster, pcl);
                   1256:        putushort(denp[1].deCDate, ndirent.de_CDate);
                   1257:        putushort(denp[1].deCTime, ndirent.de_CTime);
                   1258:        denp[1].deCHundredth = ndirent.de_CHun;
                   1259:        putushort(denp[1].deADate, ndirent.de_ADate);
                   1260:        putushort(denp[1].deMDate, ndirent.de_MDate);
                   1261:        putushort(denp[1].deMTime, ndirent.de_MTime);
                   1262:        if (FAT32(pmp)) {
                   1263:                putushort(denp[0].deHighClust, newcluster >> 16);
                   1264:                putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16);
1.22      christos 1265:        } else {
                   1266:                putushort(denp[0].deHighClust, 0);
                   1267:                putushort(denp[1].deHighClust, 0);
1.1       jdolecek 1268:        }
                   1269:
                   1270:        if (async)
                   1271:                bdwrite(bp);
                   1272:        else if ((error = bwrite(bp)) != 0)
                   1273:                goto bad;
                   1274:
                   1275:        /*
                   1276:         * Now build up a directory entry pointing to the newly allocated
                   1277:         * cluster.  This will be written to an empty slot in the parent
                   1278:         * directory.
                   1279:         */
                   1280: #ifdef DIAGNOSTIC
                   1281:        if ((cnp->cn_flags & HASBUF) == 0)
                   1282:                panic("msdosfs_mkdir: no name");
                   1283: #endif
                   1284:        if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0)
                   1285:                goto bad;
                   1286:
                   1287:        ndirent.de_Attributes = ATTR_DIRECTORY;
                   1288:        ndirent.de_StartCluster = newcluster;
                   1289:        ndirent.de_FileSize = 0;
                   1290:        ndirent.de_dev = pdep->de_dev;
                   1291:        ndirent.de_devvp = pdep->de_devvp;
                   1292:        if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0)
                   1293:                goto bad;
                   1294:        if ((cnp->cn_flags & SAVESTART) == 0)
                   1295:                PNBUF_PUT(cnp->cn_pnbuf);
                   1296:        VN_KNOTE(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
                   1297:        vput(ap->a_dvp);
                   1298:        *ap->a_vpp = DETOV(dep);
                   1299:        return (0);
                   1300:
                   1301: bad:
                   1302:        clusterfree(pmp, newcluster, NULL);
                   1303: bad2:
                   1304:        PNBUF_PUT(cnp->cn_pnbuf);
                   1305:        vput(ap->a_dvp);
                   1306:        return (error);
                   1307: }
                   1308:
                   1309: int
                   1310: msdosfs_rmdir(v)
                   1311:        void *v;
                   1312: {
                   1313:        struct vop_rmdir_args /* {
                   1314:                struct vnode *a_dvp;
                   1315:                struct vnode *a_vp;
                   1316:                struct componentname *a_cnp;
                   1317:        } */ *ap = v;
                   1318:        struct vnode *vp = ap->a_vp;
                   1319:        struct vnode *dvp = ap->a_dvp;
                   1320:        struct componentname *cnp = ap->a_cnp;
                   1321:        struct denode *ip, *dp;
                   1322:        int error;
                   1323:
                   1324:        ip = VTODE(vp);
                   1325:        dp = VTODE(dvp);
                   1326:        /*
                   1327:         * No rmdir "." please.
                   1328:         */
                   1329:        if (dp == ip) {
                   1330:                vrele(dvp);
                   1331:                vput(vp);
                   1332:                return (EINVAL);
                   1333:        }
                   1334:        /*
                   1335:         * Verify the directory is empty (and valid).
                   1336:         * (Rmdir ".." won't be valid since
                   1337:         *  ".." will contain a reference to
                   1338:         *  the current directory and thus be
                   1339:         *  non-empty.)
                   1340:         */
                   1341:        error = 0;
                   1342:        if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) {
                   1343:                error = ENOTEMPTY;
                   1344:                goto out;
                   1345:        }
                   1346:        /*
                   1347:         * Delete the entry from the directory.  For dos filesystems this
                   1348:         * gets rid of the directory entry on disk, the in memory copy
                   1349:         * still exists but the de_refcnt is <= 0.  This prevents it from
                   1350:         * being found by deget().  When the vput() on dep is done we give
                   1351:         * up access and eventually msdosfs_reclaim() will be called which
                   1352:         * will remove it from the denode cache.
                   1353:         */
                   1354:        if ((error = removede(dp, ip)) != 0)
                   1355:                goto out;
                   1356:        /*
                   1357:         * This is where we decrement the link count in the parent
                   1358:         * directory.  Since dos filesystems don't do this we just purge
                   1359:         * the name cache and let go of the parent directory denode.
                   1360:         */
                   1361:        VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
                   1362:        cache_purge(dvp);
                   1363:        vput(dvp);
                   1364:        dvp = NULL;
                   1365:        /*
                   1366:         * Truncate the directory that is being deleted.
                   1367:         */
1.24      christos 1368:        error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, cnp->cn_lwp);
1.1       jdolecek 1369:        cache_purge(vp);
                   1370: out:
                   1371:        VN_KNOTE(vp, NOTE_DELETE);
                   1372:        if (dvp)
                   1373:                vput(dvp);
                   1374:        vput(vp);
                   1375:        return (error);
                   1376: }
                   1377:
                   1378: /*
                   1379:  * DOS filesystems don't know what symlinks are.
                   1380:  */
                   1381: int
                   1382: msdosfs_symlink(v)
                   1383:        void *v;
                   1384: {
                   1385:        struct vop_symlink_args /* {
                   1386:                struct vnode *a_dvp;
                   1387:                struct vnode **a_vpp;
                   1388:                struct componentname *a_cnp;
                   1389:                struct vattr *a_vap;
                   1390:                char *a_target;
                   1391:        } */ *ap = v;
                   1392:
                   1393:        VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
                   1394:        vput(ap->a_dvp);
                   1395:        return (EOPNOTSUPP);
                   1396: }
                   1397:
                   1398: int
                   1399: msdosfs_readdir(v)
                   1400:        void *v;
                   1401: {
                   1402:        struct vop_readdir_args /* {
                   1403:                struct vnode *a_vp;
                   1404:                struct uio *a_uio;
1.26.4.1  elad     1405:                kauth_cred_t a_cred;
1.1       jdolecek 1406:                int *a_eofflag;
                   1407:                off_t **a_cookies;
                   1408:                int *a_ncookies;
                   1409:        } */ *ap = v;
                   1410:        int error = 0;
                   1411:        int diff;
                   1412:        long n;
                   1413:        int blsize;
                   1414:        long on;
                   1415:        long lost;
                   1416:        long count;
                   1417:        u_long cn;
1.19      christos 1418:        ino_t fileno;
1.1       jdolecek 1419:        u_long dirsperblk;
                   1420:        long bias = 0;
                   1421:        daddr_t bn, lbn;
                   1422:        struct buf *bp;
                   1423:        struct denode *dep = VTODE(ap->a_vp);
                   1424:        struct msdosfsmount *pmp = dep->de_pmp;
                   1425:        struct direntry *dentp;
                   1426:        struct dirent dirbuf;
                   1427:        struct uio *uio = ap->a_uio;
                   1428:        off_t *cookies = NULL;
                   1429:        int ncookies = 0, nc = 0;
                   1430:        off_t offset, uio_off;
                   1431:        int chksum = -1;
                   1432:
                   1433: #ifdef MSDOSFS_DEBUG
                   1434:        printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
                   1435:            ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
                   1436: #endif
                   1437:
                   1438:        /*
                   1439:         * msdosfs_readdir() won't operate properly on regular files since
                   1440:         * it does i/o only with the filesystem vnode, and hence can
                   1441:         * retrieve the wrong block from the buffer cache for a plain file.
                   1442:         * So, fail attempts to readdir() on a plain file.
                   1443:         */
                   1444:        if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
                   1445:                return (ENOTDIR);
                   1446:
                   1447:        /*
                   1448:         * To be safe, initialize dirbuf
                   1449:         */
                   1450:        memset(dirbuf.d_name, 0, sizeof(dirbuf.d_name));
                   1451:
                   1452:        /*
                   1453:         * If the user buffer is smaller than the size of one dos directory
                   1454:         * entry or the file offset is not a multiple of the size of a
                   1455:         * directory entry, then we fail the read.
                   1456:         */
                   1457:        count = uio->uio_resid & ~(sizeof(struct direntry) - 1);
                   1458:        offset = uio->uio_offset;
                   1459:        if (count < sizeof(struct direntry) ||
                   1460:            (offset & (sizeof(struct direntry) - 1)))
                   1461:                return (EINVAL);
                   1462:        lost = uio->uio_resid - count;
                   1463:        uio->uio_resid = count;
                   1464:        uio_off = uio->uio_offset;
                   1465:
                   1466:        if (ap->a_ncookies) {
                   1467:                nc = uio->uio_resid / 16;
                   1468:                cookies = malloc(nc * sizeof (off_t), M_TEMP, M_WAITOK);
                   1469:                *ap->a_cookies = cookies;
                   1470:        }
                   1471:
                   1472:        dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
                   1473:
                   1474:        /*
                   1475:         * If they are reading from the root directory then, we simulate
                   1476:         * the . and .. entries since these don't exist in the root
                   1477:         * directory.  We also set the offset bias to make up for having to
                   1478:         * simulate these entries. By this I mean that at file offset 64 we
                   1479:         * read the first entry in the root directory that lives on disk.
                   1480:         */
                   1481:        if (dep->de_StartCluster == MSDOSFSROOT
                   1482:            || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
                   1483: #if 0
                   1484:                printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n",
                   1485:                    offset);
                   1486: #endif
                   1487:                bias = 2 * sizeof(struct direntry);
                   1488:                if (offset < bias) {
                   1489:                        for (n = (int)offset / sizeof(struct direntry);
                   1490:                             n < 2; n++) {
                   1491:                                if (FAT32(pmp))
                   1492:                                        dirbuf.d_fileno = cntobn(pmp,
1.19      christos 1493:                                             (ino_t)pmp->pm_rootdirblk)
                   1494:                                             * dirsperblk;
1.1       jdolecek 1495:                                else
                   1496:                                        dirbuf.d_fileno = 1;
                   1497:                                dirbuf.d_type = DT_DIR;
                   1498:                                switch (n) {
                   1499:                                case 0:
                   1500:                                        dirbuf.d_namlen = 1;
1.3       itojun   1501:                                        strlcpy(dirbuf.d_name, ".",
                   1502:                                            sizeof(dirbuf.d_name));
1.1       jdolecek 1503:                                        break;
                   1504:                                case 1:
                   1505:                                        dirbuf.d_namlen = 2;
1.3       itojun   1506:                                        strlcpy(dirbuf.d_name, "..",
                   1507:                                            sizeof(dirbuf.d_name));
1.1       jdolecek 1508:                                        break;
                   1509:                                }
1.15      christos 1510:                                dirbuf.d_reclen = _DIRENT_SIZE(&dirbuf);
1.1       jdolecek 1511:                                if (uio->uio_resid < dirbuf.d_reclen)
                   1512:                                        goto out;
1.14      perry    1513:                                error = uiomove(&dirbuf,
1.1       jdolecek 1514:                                                dirbuf.d_reclen, uio);
                   1515:                                if (error)
                   1516:                                        goto out;
                   1517:                                offset += sizeof(struct direntry);
                   1518:                                uio_off = offset;
                   1519:                                if (cookies) {
                   1520:                                        *cookies++ = offset;
                   1521:                                        ncookies++;
                   1522:                                        if (ncookies >= nc)
                   1523:                                                goto out;
                   1524:                                }
                   1525:                        }
                   1526:                }
                   1527:        }
                   1528:
                   1529:        while (uio->uio_resid > 0) {
                   1530:                lbn = de_cluster(pmp, offset - bias);
                   1531:                on = (offset - bias) & pmp->pm_crbomask;
                   1532:                n = MIN(pmp->pm_bpcluster - on, uio->uio_resid);
                   1533:                diff = dep->de_FileSize - (offset - bias);
                   1534:                if (diff <= 0)
                   1535:                        break;
                   1536:                n = MIN(n, diff);
                   1537:                if ((error = pcbmap(dep, lbn, &bn, &cn, &blsize)) != 0)
                   1538:                        break;
                   1539:                error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp);
                   1540:                if (error) {
                   1541:                        brelse(bp);
                   1542:                        return (error);
                   1543:                }
                   1544:                n = MIN(n, blsize - bp->b_resid);
                   1545:
                   1546:                /*
                   1547:                 * Convert from dos directory entries to fs-independent
                   1548:                 * directory entries.
                   1549:                 */
                   1550:                for (dentp = (struct direntry *)(bp->b_data + on);
                   1551:                     (char *)dentp < bp->b_data + on + n;
                   1552:                     dentp++, offset += sizeof(struct direntry)) {
                   1553: #if 0
                   1554:
                   1555:                        printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
                   1556:                            dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
                   1557: #endif
                   1558:                        /*
                   1559:                         * If this is an unused entry, we can stop.
                   1560:                         */
                   1561:                        if (dentp->deName[0] == SLOT_EMPTY) {
                   1562:                                brelse(bp);
                   1563:                                goto out;
                   1564:                        }
                   1565:                        /*
                   1566:                         * Skip deleted entries.
                   1567:                         */
                   1568:                        if (dentp->deName[0] == SLOT_DELETED) {
                   1569:                                chksum = -1;
                   1570:                                continue;
                   1571:                        }
                   1572:
                   1573:                        /*
                   1574:                         * Handle Win95 long directory entries
                   1575:                         */
                   1576:                        if (dentp->deAttributes == ATTR_WIN95) {
                   1577:                                if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
                   1578:                                        continue;
                   1579:                                chksum = win2unixfn((struct winentry *)dentp, &dirbuf, chksum);
                   1580:                                continue;
                   1581:                        }
                   1582:
                   1583:                        /*
                   1584:                         * Skip volume labels
                   1585:                         */
                   1586:                        if (dentp->deAttributes & ATTR_VOLUME) {
                   1587:                                chksum = -1;
                   1588:                                continue;
                   1589:                        }
                   1590:                        /*
                   1591:                         * This computation of d_fileno must match
                   1592:                         * the computation of va_fileid in
                   1593:                         * msdosfs_getattr.
                   1594:                         */
                   1595:                        if (dentp->deAttributes & ATTR_DIRECTORY) {
                   1596:                                fileno = getushort(dentp->deStartCluster);
                   1597:                                if (FAT32(pmp))
1.19      christos 1598:                                        fileno |= ((ino_t)getushort(dentp->deHighClust)) << 16;
1.1       jdolecek 1599:                                /* if this is the root directory */
                   1600:                                if (fileno == MSDOSFSROOT)
                   1601:                                        if (FAT32(pmp))
                   1602:                                                fileno = cntobn(pmp,
1.19      christos 1603:                                                    (ino_t)pmp->pm_rootdirblk)
                   1604:                                                    * dirsperblk;
1.1       jdolecek 1605:                                        else
                   1606:                                                fileno = 1;
                   1607:                                else
                   1608:                                        fileno = cntobn(pmp, fileno) * dirsperblk;
                   1609:                                dirbuf.d_fileno = fileno;
                   1610:                                dirbuf.d_type = DT_DIR;
                   1611:                        } else {
                   1612:                                dirbuf.d_fileno = offset / sizeof(struct direntry);
                   1613:                                dirbuf.d_type = DT_REG;
                   1614:                        }
                   1615:                        if (chksum != winChksum(dentp->deName))
                   1616:                                dirbuf.d_namlen = dos2unixfn(dentp->deName,
                   1617:                                    (u_char *)dirbuf.d_name,
                   1618:                                    pmp->pm_flags & MSDOSFSMNT_SHORTNAME);
                   1619:                        else
                   1620:                                dirbuf.d_name[dirbuf.d_namlen] = 0;
                   1621:                        chksum = -1;
1.15      christos 1622:                        dirbuf.d_reclen = _DIRENT_SIZE(&dirbuf);
1.1       jdolecek 1623:                        if (uio->uio_resid < dirbuf.d_reclen) {
                   1624:                                brelse(bp);
                   1625:                                goto out;
                   1626:                        }
1.10      jrf      1627:                        error = uiomove(&dirbuf,
1.1       jdolecek 1628:                                        dirbuf.d_reclen, uio);
                   1629:                        if (error) {
                   1630:                                brelse(bp);
                   1631:                                goto out;
                   1632:                        }
                   1633:                        uio_off = offset + sizeof(struct direntry);
                   1634:                        if (cookies) {
                   1635:                                *cookies++ = offset + sizeof(struct direntry);
                   1636:                                ncookies++;
                   1637:                                if (ncookies >= nc) {
                   1638:                                        brelse(bp);
                   1639:                                        goto out;
                   1640:                                }
                   1641:                        }
                   1642:                }
                   1643:                brelse(bp);
                   1644:        }
                   1645:
                   1646: out:
                   1647:        uio->uio_offset = uio_off;
                   1648:        uio->uio_resid += lost;
                   1649:        if (dep->de_FileSize - (offset - bias) <= 0)
                   1650:                *ap->a_eofflag = 1;
                   1651:        else
                   1652:                *ap->a_eofflag = 0;
                   1653:
                   1654:        if (ap->a_ncookies) {
                   1655:                if (error) {
                   1656:                        free(*ap->a_cookies, M_TEMP);
                   1657:                        *ap->a_ncookies = 0;
                   1658:                        *ap->a_cookies = NULL;
                   1659:                } else
                   1660:                        *ap->a_ncookies = ncookies;
                   1661:        }
                   1662:        return (error);
                   1663: }
                   1664:
                   1665: /*
                   1666:  * DOS filesystems don't know what symlinks are.
                   1667:  */
                   1668: int
                   1669: msdosfs_readlink(v)
                   1670:        void *v;
                   1671: {
                   1672: #if 0
                   1673:        struct vop_readlink_args /* {
                   1674:                struct vnode *a_vp;
                   1675:                struct uio *a_uio;
1.26.4.1  elad     1676:                kauth_cred_t a_cred;
1.1       jdolecek 1677:        } */ *ap;
                   1678: #endif
                   1679:
                   1680:        return (EINVAL);
                   1681: }
                   1682:
                   1683: /*
                   1684:  * vp  - address of vnode file the file
                   1685:  * bn  - which cluster we are interested in mapping to a filesystem block number.
                   1686:  * vpp - returns the vnode for the block special file holding the filesystem
                   1687:  *      containing the file of interest
                   1688:  * bnp - address of where to return the filesystem relative block number
                   1689:  */
                   1690: int
                   1691: msdosfs_bmap(v)
                   1692:        void *v;
                   1693: {
                   1694:        struct vop_bmap_args /* {
                   1695:                struct vnode *a_vp;
                   1696:                daddr_t a_bn;
                   1697:                struct vnode **a_vpp;
                   1698:                daddr_t *a_bnp;
                   1699:                int *a_runp;
                   1700:        } */ *ap = v;
                   1701:        struct denode *dep = VTODE(ap->a_vp);
                   1702:
                   1703:        if (ap->a_vpp != NULL)
                   1704:                *ap->a_vpp = dep->de_devvp;
                   1705:        if (ap->a_bnp == NULL)
                   1706:                return (0);
                   1707:        if (ap->a_runp) {
                   1708:                /*
                   1709:                 * Sequential clusters should be counted here.
                   1710:                 */
                   1711:                *ap->a_runp = 0;
                   1712:        }
                   1713:        return (pcbmap(dep, ap->a_bn, ap->a_bnp, 0, 0));
                   1714: }
                   1715:
                   1716: int
                   1717: msdosfs_strategy(v)
                   1718:        void *v;
                   1719: {
                   1720:        struct vop_strategy_args /* {
1.9       hannken  1721:                struct vnode *a_vp;
1.1       jdolecek 1722:                struct buf *a_bp;
                   1723:        } */ *ap = v;
1.9       hannken  1724:        struct vnode *vp = ap->a_vp;
1.1       jdolecek 1725:        struct buf *bp = ap->a_bp;
                   1726:        struct denode *dep = VTODE(bp->b_vp);
                   1727:        int error = 0;
                   1728:
1.9       hannken  1729:        if (vp->v_type == VBLK || vp->v_type == VCHR)
1.1       jdolecek 1730:                panic("msdosfs_strategy: spec");
                   1731:        /*
                   1732:         * If we don't already know the filesystem relative block number
                   1733:         * then get it using pcbmap().  If pcbmap() returns the block
                   1734:         * number as -1 then we've got a hole in the file.  DOS filesystems
                   1735:         * don't allow files with holes, so we shouldn't ever see this.
                   1736:         */
                   1737:        if (bp->b_blkno == bp->b_lblkno) {
                   1738:                error = pcbmap(dep, de_bn2cn(dep->de_pmp, bp->b_lblkno),
                   1739:                               &bp->b_blkno, 0, 0);
                   1740:                if (error)
                   1741:                        bp->b_blkno = -1;
                   1742:                if (bp->b_blkno == -1)
                   1743:                        clrbuf(bp);
                   1744:        }
                   1745:        if (bp->b_blkno == -1) {
                   1746:                biodone(bp);
                   1747:                return (error);
                   1748:        }
                   1749:
                   1750:        /*
                   1751:         * Read/write the block from/to the disk that contains the desired
                   1752:         * file block.
                   1753:         */
                   1754:
                   1755:        vp = dep->de_devvp;
1.8       hannken  1756:        return (VOP_STRATEGY(vp, bp));
1.1       jdolecek 1757: }
                   1758:
                   1759: int
                   1760: msdosfs_print(v)
                   1761:        void *v;
                   1762: {
                   1763:        struct vop_print_args /* {
                   1764:                struct vnode *vp;
                   1765:        } */ *ap = v;
                   1766:        struct denode *dep = VTODE(ap->a_vp);
                   1767:
                   1768:        printf(
                   1769:            "tag VT_MSDOSFS, startcluster %ld, dircluster %ld, diroffset %ld ",
                   1770:            dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
                   1771:        printf(" dev %d, %d ", major(dep->de_dev), minor(dep->de_dev));
                   1772:        lockmgr_printinfo(&ap->a_vp->v_lock);
                   1773:        printf("\n");
                   1774:        return (0);
                   1775: }
                   1776:
                   1777: int
                   1778: msdosfs_advlock(v)
                   1779:        void *v;
                   1780: {
                   1781:        struct vop_advlock_args /* {
                   1782:                struct vnode *a_vp;
1.11      jrf      1783:                void *a_id;
1.1       jdolecek 1784:                int a_op;
                   1785:                struct flock *a_fl;
                   1786:                int a_flags;
                   1787:        } */ *ap = v;
                   1788:        struct denode *dep = VTODE(ap->a_vp);
                   1789:
                   1790:        return lf_advlock(ap, &dep->de_lockf, dep->de_FileSize);
                   1791: }
                   1792:
                   1793: int
                   1794: msdosfs_pathconf(v)
                   1795:        void *v;
                   1796: {
                   1797:        struct vop_pathconf_args /* {
                   1798:                struct vnode *a_vp;
                   1799:                int a_name;
                   1800:                register_t *a_retval;
                   1801:        } */ *ap = v;
                   1802:
                   1803:        switch (ap->a_name) {
                   1804:        case _PC_LINK_MAX:
                   1805:                *ap->a_retval = 1;
                   1806:                return (0);
                   1807:        case _PC_NAME_MAX:
1.12      jdolecek 1808:                *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax;
1.1       jdolecek 1809:                return (0);
                   1810:        case _PC_PATH_MAX:
                   1811:                *ap->a_retval = PATH_MAX;
                   1812:                return (0);
                   1813:        case _PC_CHOWN_RESTRICTED:
                   1814:                *ap->a_retval = 1;
                   1815:                return (0);
                   1816:        case _PC_NO_TRUNC:
                   1817:                *ap->a_retval = 0;
                   1818:                return (0);
                   1819:        case _PC_SYNC_IO:
                   1820:                *ap->a_retval = 1;
                   1821:                return (0);
                   1822:        case _PC_FILESIZEBITS:
                   1823:                *ap->a_retval = 32;
                   1824:                return (0);
                   1825:        default:
                   1826:                return (EINVAL);
                   1827:        }
                   1828:        /* NOTREACHED */
                   1829: }
                   1830:
1.21      yamt     1831: int
                   1832: msdosfs_fsync(v)
                   1833:        void *v;
                   1834: {
                   1835:        struct vop_fsync_args /* {
                   1836:                struct vnode *a_vp;
1.26.4.1  elad     1837:                kauth_cred_t a_cred;
1.21      yamt     1838:                int a_flags;
                   1839:                off_t offlo;
                   1840:                off_t offhi;
                   1841:                struct proc *a_p;
                   1842:        } */ *ap = v;
                   1843:        struct vnode *vp = ap->a_vp;
                   1844:        int wait;
                   1845:        int error;
                   1846:
                   1847:        wait = (ap->a_flags & FSYNC_WAIT) != 0;
                   1848:        vflushbuf(vp, wait);
                   1849:        if ((ap->a_flags & FSYNC_DATAONLY) != 0)
                   1850:                error = 0;
                   1851:        else
                   1852:                error = msdosfs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0);
                   1853:
                   1854:        if (error == 0 && ap->a_flags & FSYNC_CACHE) {
                   1855:                struct denode *dep = VTODE(vp);
                   1856:                struct vnode *devvp = dep->de_devvp;
                   1857:
                   1858:                int l = 0;
                   1859:                error = VOP_IOCTL(devvp, DIOCCACHESYNC, &l, FWRITE,
1.26.4.1  elad     1860:                                          ap->a_l->l_proc->p_cred, ap->a_l);
1.21      yamt     1861:        }
                   1862:
                   1863:        return (error);
                   1864: }
                   1865:
1.20      christos 1866: void
                   1867: msdosfs_detimes(struct denode *dep, const struct timespec *acc,
                   1868:     const struct timespec *mod, const struct timespec *cre, int gmtoff)
                   1869: {
                   1870:        struct timespec *ts = NULL, tsb;
                   1871:
                   1872:        KASSERT(dep->de_flag & (DE_UPDATE | DE_CREATE | DE_ACCESS));
                   1873:        dep->de_flag |= DE_MODIFIED;
                   1874:        if (dep->de_flag & DE_UPDATE) {
                   1875:                if (mod == NULL)
                   1876:                        mod = ts == NULL ? (ts = nanotime(&tsb)) : ts;
                   1877:                unix2dostime(mod, gmtoff, &dep->de_MDate, &dep->de_MTime, NULL);
                   1878:                dep->de_Attributes |= ATTR_ARCHIVE;
                   1879:        }
                   1880:        if ((dep->de_pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0) {
                   1881:                if (dep->de_flag & DE_ACCESS)  {
                   1882:                        if (acc == NULL)
                   1883:                                acc = ts == NULL ? (ts = nanotime(&tsb)) : ts;
                   1884:                        unix2dostime(acc, gmtoff, &dep->de_ADate, NULL, NULL);
                   1885:                }
                   1886:                if (dep->de_flag & DE_CREATE) {
                   1887:                        if (cre == NULL)
                   1888:                                cre = ts == NULL ? (ts = nanotime(&tsb)) : ts;
                   1889:                        unix2dostime(cre, gmtoff, &dep->de_CDate,
                   1890:                            &dep->de_CTime, &dep->de_CHun);
                   1891:                }
                   1892:        }
                   1893:
                   1894:        dep->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS);
                   1895: }
                   1896:
1.1       jdolecek 1897: /* Global vfs data structures for msdosfs */
1.18      xtraeme  1898: int (**msdosfs_vnodeop_p)(void *);
1.1       jdolecek 1899: const struct vnodeopv_entry_desc msdosfs_vnodeop_entries[] = {
                   1900:        { &vop_default_desc, vn_default_error },
                   1901:        { &vop_lookup_desc, msdosfs_lookup },           /* lookup */
                   1902:        { &vop_create_desc, msdosfs_create },           /* create */
                   1903:        { &vop_mknod_desc, msdosfs_mknod },             /* mknod */
                   1904:        { &vop_open_desc, msdosfs_open },               /* open */
                   1905:        { &vop_close_desc, msdosfs_close },             /* close */
                   1906:        { &vop_access_desc, msdosfs_access },           /* access */
                   1907:        { &vop_getattr_desc, msdosfs_getattr },         /* getattr */
                   1908:        { &vop_setattr_desc, msdosfs_setattr },         /* setattr */
                   1909:        { &vop_read_desc, msdosfs_read },               /* read */
                   1910:        { &vop_write_desc, msdosfs_write },             /* write */
                   1911:        { &vop_lease_desc, msdosfs_lease_check },       /* lease */
                   1912:        { &vop_fcntl_desc, genfs_fcntl },               /* fcntl */
                   1913:        { &vop_ioctl_desc, msdosfs_ioctl },             /* ioctl */
                   1914:        { &vop_poll_desc, msdosfs_poll },               /* poll */
                   1915:        { &vop_kqfilter_desc, genfs_kqfilter },         /* kqfilter */
                   1916:        { &vop_revoke_desc, msdosfs_revoke },           /* revoke */
                   1917:        { &vop_mmap_desc, msdosfs_mmap },               /* mmap */
                   1918:        { &vop_fsync_desc, msdosfs_fsync },             /* fsync */
                   1919:        { &vop_seek_desc, msdosfs_seek },               /* seek */
                   1920:        { &vop_remove_desc, msdosfs_remove },           /* remove */
                   1921:        { &vop_link_desc, msdosfs_link },               /* link */
                   1922:        { &vop_rename_desc, msdosfs_rename },           /* rename */
                   1923:        { &vop_mkdir_desc, msdosfs_mkdir },             /* mkdir */
                   1924:        { &vop_rmdir_desc, msdosfs_rmdir },             /* rmdir */
                   1925:        { &vop_symlink_desc, msdosfs_symlink },         /* symlink */
                   1926:        { &vop_readdir_desc, msdosfs_readdir },         /* readdir */
                   1927:        { &vop_readlink_desc, msdosfs_readlink },       /* readlink */
                   1928:        { &vop_abortop_desc, msdosfs_abortop },         /* abortop */
                   1929:        { &vop_inactive_desc, msdosfs_inactive },       /* inactive */
                   1930:        { &vop_reclaim_desc, msdosfs_reclaim },         /* reclaim */
                   1931:        { &vop_lock_desc, genfs_lock },                 /* lock */
                   1932:        { &vop_unlock_desc, genfs_unlock },             /* unlock */
                   1933:        { &vop_bmap_desc, msdosfs_bmap },               /* bmap */
                   1934:        { &vop_strategy_desc, msdosfs_strategy },       /* strategy */
                   1935:        { &vop_print_desc, msdosfs_print },             /* print */
                   1936:        { &vop_islocked_desc, genfs_islocked },         /* islocked */
                   1937:        { &vop_pathconf_desc, msdosfs_pathconf },       /* pathconf */
                   1938:        { &vop_advlock_desc, msdosfs_advlock },         /* advlock */
                   1939:        { &vop_bwrite_desc, vn_bwrite },                /* bwrite */
                   1940:        { &vop_getpages_desc, genfs_getpages },         /* getpages */
                   1941:        { &vop_putpages_desc, genfs_putpages },         /* putpages */
                   1942:        { NULL, NULL }
                   1943: };
                   1944: const struct vnodeopv_desc msdosfs_vnodeop_opv_desc =
                   1945:        { &msdosfs_vnodeop_p, msdosfs_vnodeop_entries };

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