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Annotation of src/sys/fs/msdosfs/msdosfs_vnops.c, Revision 1.77

1.77    ! hannken     1: /*     $NetBSD: msdosfs_vnops.c,v 1.76 2011/06/12 03:35:53 rmind 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>
1.77    ! hannken    51: __KERNEL_RCSID(0, "$NetBSD: msdosfs_vnops.c,v 1.76 2011/06/12 03:35:53 rmind 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>
1.64      hannken    63: #include <sys/fstrans.h>
1.1       jdolecek   64: #include <sys/vnode.h>
                     65: #include <sys/signalvar.h>
                     66: #include <sys/malloc.h>
                     67: #include <sys/dirent.h>
                     68: #include <sys/lockf.h>
1.28      elad       69: #include <sys/kauth.h>
1.1       jdolecek   70:
                     71: #include <miscfs/genfs/genfs.h>
                     72: #include <miscfs/specfs/specdev.h> /* XXX */   /* defines v_rdev */
                     73:
                     74: #include <uvm/uvm_extern.h>
                     75:
                     76: #include <fs/msdosfs/bpb.h>
                     77: #include <fs/msdosfs/direntry.h>
                     78: #include <fs/msdosfs/denode.h>
                     79: #include <fs/msdosfs/msdosfsmount.h>
                     80: #include <fs/msdosfs/fat.h>
                     81:
                     82: /*
                     83:  * Some general notes:
                     84:  *
                     85:  * In the ufs filesystem the inodes, superblocks, and indirect blocks are
                     86:  * read/written using the vnode for the filesystem. Blocks that represent
                     87:  * the contents of a file are read/written using the vnode for the file
                     88:  * (including directories when they are read/written as files). This
                     89:  * presents problems for the dos filesystem because data that should be in
                     90:  * an inode (if dos had them) resides in the directory itself.  Since we
                     91:  * must update directory entries without the benefit of having the vnode
                     92:  * for the directory we must use the vnode for the filesystem.  This means
                     93:  * that when a directory is actually read/written (via read, write, or
                     94:  * readdir, or seek) we must use the vnode for the filesystem instead of
                     95:  * the vnode for the directory as would happen in ufs. This is to insure we
                     96:  * retrieve the correct block from the buffer cache since the hash value is
                     97:  * based upon the vnode address and the desired block number.
                     98:  */
                     99:
                    100: /*
                    101:  * Create a regular file. On entry the directory to contain the file being
1.69      dholland  102:  * created is locked.  We must release before we return.
1.1       jdolecek  103:  */
                    104: int
1.58      dsl       105: msdosfs_create(void *v)
1.1       jdolecek  106: {
                    107:        struct vop_create_args /* {
                    108:                struct vnode *a_dvp;
                    109:                struct vnode **a_vpp;
                    110:                struct componentname *a_cnp;
                    111:                struct vattr *a_vap;
                    112:        } */ *ap = v;
                    113:        struct componentname *cnp = ap->a_cnp;
                    114:        struct denode ndirent;
                    115:        struct denode *dep;
                    116:        struct denode *pdep = VTODE(ap->a_dvp);
                    117:        int error;
                    118:
                    119: #ifdef MSDOSFS_DEBUG
                    120:        printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap);
                    121: #endif
                    122:
1.64      hannken   123:        fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED);
1.1       jdolecek  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:        memset(&ndirent, 0, sizeof(ndirent));
                    142:        if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0)
                    143:                goto bad;
                    144:
                    145:        ndirent.de_Attributes = (ap->a_vap->va_mode & S_IWUSR) ?
                    146:                                ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY;
                    147:        ndirent.de_StartCluster = 0;
                    148:        ndirent.de_FileSize = 0;
                    149:        ndirent.de_dev = pdep->de_dev;
                    150:        ndirent.de_devvp = pdep->de_devvp;
                    151:        ndirent.de_pmp = pdep->de_pmp;
                    152:        ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1.20      christos  153:        DETIMES(&ndirent, NULL, NULL, NULL, pdep->de_pmp->pm_gmtoff);
1.1       jdolecek  154:        if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0)
                    155:                goto bad;
1.64      hannken   156:        fstrans_done(ap->a_dvp->v_mount);
1.1       jdolecek  157:        VN_KNOTE(ap->a_dvp, NOTE_WRITE);
                    158:        vput(ap->a_dvp);
                    159:        *ap->a_vpp = DETOV(dep);
                    160:        return (0);
                    161:
                    162: bad:
1.64      hannken   163:        fstrans_done(ap->a_dvp->v_mount);
1.1       jdolecek  164:        vput(ap->a_dvp);
                    165:        return (error);
                    166: }
                    167:
                    168: int
1.58      dsl       169: msdosfs_close(void *v)
1.1       jdolecek  170: {
                    171:        struct vop_close_args /* {
                    172:                struct vnode *a_vp;
                    173:                int a_fflag;
1.28      elad      174:                kauth_cred_t a_cred;
1.1       jdolecek  175:        } */ *ap = v;
                    176:        struct vnode *vp = ap->a_vp;
                    177:        struct denode *dep = VTODE(vp);
                    178:
1.64      hannken   179:        fstrans_start(vp->v_mount, FSTRANS_SHARED);
1.76      rmind     180:        mutex_enter(vp->v_interlock);
1.20      christos  181:        if (vp->v_usecount > 1)
                    182:                DETIMES(dep, NULL, NULL, NULL, dep->de_pmp->pm_gmtoff);
1.76      rmind     183:        mutex_exit(vp->v_interlock);
1.64      hannken   184:        fstrans_done(vp->v_mount);
1.1       jdolecek  185:        return (0);
                    186: }
                    187:
1.61      elad      188: static int
                    189: msdosfs_check_possible(struct vnode *vp, struct denode *dep, mode_t mode)
1.1       jdolecek  190: {
                    191:
                    192:        /*
                    193:         * Disallow write attempts on read-only file systems;
                    194:         * unless the file is a socket, fifo, or a block or
                    195:         * character device resident on the file system.
                    196:         */
                    197:        if (mode & VWRITE) {
                    198:                switch (vp->v_type) {
                    199:                case VDIR:
                    200:                case VLNK:
                    201:                case VREG:
                    202:                        if (vp->v_mount->mnt_flag & MNT_RDONLY)
                    203:                                return (EROFS);
                    204:                default:
                    205:                        break;
                    206:                }
                    207:        }
                    208:
1.61      elad      209:        return 0;
                    210: }
                    211:
                    212: static int
                    213: msdosfs_check_permitted(struct vnode *vp, struct denode *dep, mode_t mode,
                    214:     kauth_cred_t cred)
                    215: {
                    216:        struct msdosfsmount *pmp = dep->de_pmp;
                    217:        mode_t file_mode;
                    218:
1.1       jdolecek  219:        if ((dep->de_Attributes & ATTR_READONLY) == 0)
1.61      elad      220:                file_mode = S_IRWXU|S_IRWXG|S_IRWXO;
1.1       jdolecek  221:        else
1.61      elad      222:                file_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
                    223:
                    224:        return genfs_can_access(vp->v_type,
                    225:            file_mode & (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask),
                    226:            pmp->pm_uid, pmp->pm_gid, mode, cred);
                    227: }
                    228:
                    229: int
                    230: msdosfs_access(void *v)
                    231: {
                    232:        struct vop_access_args /* {
                    233:                struct vnode *a_vp;
                    234:                int a_mode;
                    235:                kauth_cred_t a_cred;
                    236:        } */ *ap = v;
                    237:        struct vnode *vp = ap->a_vp;
                    238:        struct denode *dep = VTODE(vp);
                    239:        int error;
                    240:
                    241:        error = msdosfs_check_possible(vp, dep, ap->a_mode);
                    242:        if (error)
                    243:                return error;
                    244:
                    245:        error = msdosfs_check_permitted(vp, dep, ap->a_mode, ap->a_cred);
                    246:
                    247:        return error;
1.1       jdolecek  248: }
                    249:
                    250: int
1.58      dsl       251: msdosfs_getattr(void *v)
1.1       jdolecek  252: {
                    253:        struct vop_getattr_args /* {
                    254:                struct vnode *a_vp;
                    255:                struct vattr *a_vap;
1.28      elad      256:                kauth_cred_t a_cred;
1.1       jdolecek  257:        } */ *ap = v;
                    258:        struct denode *dep = VTODE(ap->a_vp);
                    259:        struct msdosfsmount *pmp = dep->de_pmp;
                    260:        struct vattr *vap = ap->a_vap;
                    261:        mode_t mode;
                    262:        u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1.19      christos  263:        ino_t fileid;
1.1       jdolecek  264:
1.64      hannken   265:        fstrans_start(ap->a_vp->v_mount, FSTRANS_SHARED);
1.20      christos  266:        DETIMES(dep, NULL, NULL, NULL, pmp->pm_gmtoff);
1.1       jdolecek  267:        vap->va_fsid = dep->de_dev;
                    268:        /*
                    269:         * The following computation of the fileid must be the same as that
                    270:         * used in msdosfs_readdir() to compute d_fileno. If not, pwd
                    271:         * doesn't work.
                    272:         */
                    273:        if (dep->de_Attributes & ATTR_DIRECTORY) {
1.19      christos  274:                fileid = cntobn(pmp, (ino_t)dep->de_StartCluster) * dirsperblk;
1.1       jdolecek  275:                if (dep->de_StartCluster == MSDOSFSROOT)
                    276:                        fileid = 1;
                    277:        } else {
1.19      christos  278:                fileid = cntobn(pmp, (ino_t)dep->de_dirclust) * dirsperblk;
1.1       jdolecek  279:                if (dep->de_dirclust == MSDOSFSROOT)
                    280:                        fileid = roottobn(pmp, 0) * dirsperblk;
                    281:                fileid += dep->de_diroffset / sizeof(struct direntry);
                    282:        }
                    283:        vap->va_fileid = fileid;
                    284:        if ((dep->de_Attributes & ATTR_READONLY) == 0)
                    285:                mode = S_IRWXU|S_IRWXG|S_IRWXO;
                    286:        else
                    287:                mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
1.6       jdolecek  288:        vap->va_mode =
                    289:            mode & (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
1.1       jdolecek  290:        vap->va_uid = pmp->pm_uid;
                    291:        vap->va_gid = pmp->pm_gid;
                    292:        vap->va_nlink = 1;
                    293:        vap->va_rdev = 0;
                    294:        vap->va_size = ap->a_vp->v_size;
1.7       itojun    295:        dos2unixtime(dep->de_MDate, dep->de_MTime, 0, pmp->pm_gmtoff,
                    296:            &vap->va_mtime);
1.1       jdolecek  297:        if (dep->de_pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
1.7       itojun    298:                dos2unixtime(dep->de_ADate, 0, 0, pmp->pm_gmtoff,
                    299:                    &vap->va_atime);
                    300:                dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun,
                    301:                    pmp->pm_gmtoff, &vap->va_ctime);
1.1       jdolecek  302:        } else {
                    303:                vap->va_atime = vap->va_mtime;
                    304:                vap->va_ctime = vap->va_mtime;
                    305:        }
                    306:        vap->va_flags = 0;
                    307:        if ((dep->de_Attributes & ATTR_ARCHIVE) == 0)
                    308:                vap->va_mode  |= S_ARCH1;
                    309:        vap->va_gen = 0;
                    310:        vap->va_blocksize = pmp->pm_bpcluster;
                    311:        vap->va_bytes =
                    312:            (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
                    313:        vap->va_type = ap->a_vp->v_type;
1.64      hannken   314:        fstrans_done(ap->a_vp->v_mount);
1.1       jdolecek  315:        return (0);
                    316: }
                    317:
                    318: int
1.58      dsl       319: msdosfs_setattr(void *v)
1.1       jdolecek  320: {
                    321:        struct vop_setattr_args /* {
                    322:                struct vnode *a_vp;
                    323:                struct vattr *a_vap;
1.28      elad      324:                kauth_cred_t a_cred;
1.1       jdolecek  325:        } */ *ap = v;
                    326:        int error = 0, de_changed = 0;
                    327:        struct denode *dep = VTODE(ap->a_vp);
                    328:        struct msdosfsmount *pmp = dep->de_pmp;
                    329:        struct vnode *vp  = ap->a_vp;
                    330:        struct vattr *vap = ap->a_vap;
1.28      elad      331:        kauth_cred_t cred = ap->a_cred;
1.1       jdolecek  332:
                    333: #ifdef MSDOSFS_DEBUG
1.51      ad        334:        printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n",
                    335:            ap->a_vp, vap, cred);
1.1       jdolecek  336: #endif
                    337:        /*
                    338:         * Note we silently ignore uid or gid changes.
                    339:         */
                    340:        if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) ||
                    341:            (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
                    342:            (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
                    343:            (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL) ||
1.14      perry     344:            (vap->va_uid != VNOVAL && vap->va_uid != pmp->pm_uid) ||
1.1       jdolecek  345:            (vap->va_gid != VNOVAL && vap->va_gid != pmp->pm_gid)) {
                    346: #ifdef MSDOSFS_DEBUG
                    347:                printf("msdosfs_setattr(): returning EINVAL\n");
1.57      cegger    348:                printf("    va_type %d, va_nlink %x, va_fsid %"PRIx64", va_fileid %llx\n",
1.16      christos  349:                    vap->va_type, vap->va_nlink, vap->va_fsid,
                    350:                    (unsigned long long)vap->va_fileid);
1.57      cegger    351:                printf("    va_blocksize %lx, va_rdev %"PRIx64", va_bytes %"PRIx64", va_gen %lx\n",
1.68      njoly     352:                    vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen);
1.1       jdolecek  353: #endif
                    354:                return (EINVAL);
                    355:        }
                    356:        /*
                    357:         * Silently ignore attributes modifications on directories.
                    358:         */
                    359:        if (ap->a_vp->v_type == VDIR)
                    360:                return 0;
                    361:
1.64      hannken   362:        fstrans_start(vp->v_mount, FSTRANS_SHARED);
1.1       jdolecek  363:        if (vap->va_size != VNOVAL) {
1.64      hannken   364:                if (vp->v_mount->mnt_flag & MNT_RDONLY) {
                    365:                        error = EROFS;
                    366:                        goto bad;
                    367:                }
1.44      pooka     368:                error = detrunc(dep, (u_long)vap->va_size, 0, cred);
1.1       jdolecek  369:                if (error)
1.64      hannken   370:                        goto bad;
1.1       jdolecek  371:                de_changed = 1;
                    372:        }
                    373:        if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
1.64      hannken   374:                if (vp->v_mount->mnt_flag & MNT_RDONLY) {
                    375:                        error = EROFS;
                    376:                        goto bad;
                    377:                }
1.59      elad      378:                error = genfs_can_chtimes(ap->a_vp, vap->va_vaflags,
                    379:                    pmp->pm_uid, cred);
                    380:                if (error)
1.64      hannken   381:                        goto bad;
1.1       jdolecek  382:                if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 &&
                    383:                    vap->va_atime.tv_sec != VNOVAL)
1.7       itojun    384:                        unix2dostime(&vap->va_atime, pmp->pm_gmtoff, &dep->de_ADate, NULL, NULL);
1.1       jdolecek  385:                if (vap->va_mtime.tv_sec != VNOVAL)
1.7       itojun    386:                        unix2dostime(&vap->va_mtime, pmp->pm_gmtoff, &dep->de_MDate, &dep->de_MTime, NULL);
1.1       jdolecek  387:                dep->de_Attributes |= ATTR_ARCHIVE;
                    388:                dep->de_flag |= DE_MODIFIED;
                    389:                de_changed = 1;
                    390:        }
                    391:        /*
                    392:         * DOS files only have the ability to have their writability
                    393:         * attribute set, so we use the owner write bit to set the readonly
                    394:         * attribute.
                    395:         */
                    396:        if (vap->va_mode != (mode_t)VNOVAL) {
1.64      hannken   397:                if (vp->v_mount->mnt_flag & MNT_RDONLY) {
                    398:                        error = EROFS;
                    399:                        goto bad;
                    400:                }
1.28      elad      401:                if (kauth_cred_geteuid(cred) != pmp->pm_uid &&
                    402:                    (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER,
1.36      elad      403:                    NULL)))
1.64      hannken   404:                        goto bad;
1.1       jdolecek  405:                /* We ignore the read and execute bits. */
                    406:                if (vap->va_mode & S_IWUSR)
                    407:                        dep->de_Attributes &= ~ATTR_READONLY;
                    408:                else
                    409:                        dep->de_Attributes |= ATTR_READONLY;
                    410:                dep->de_flag |= DE_MODIFIED;
                    411:                de_changed = 1;
                    412:        }
                    413:        /*
                    414:         * Allow the `archived' bit to be toggled.
                    415:         */
                    416:        if (vap->va_flags != VNOVAL) {
1.64      hannken   417:                if (vp->v_mount->mnt_flag & MNT_RDONLY) {
                    418:                        error = EROFS;
                    419:                        goto bad;
                    420:                }
1.28      elad      421:                if (kauth_cred_geteuid(cred) != pmp->pm_uid &&
                    422:                    (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER,
1.36      elad      423:                    NULL)))
1.64      hannken   424:                        goto bad;
1.1       jdolecek  425:                if (vap->va_flags & SF_ARCHIVED)
                    426:                        dep->de_Attributes &= ~ATTR_ARCHIVE;
                    427:                else
                    428:                        dep->de_Attributes |= ATTR_ARCHIVE;
                    429:                dep->de_flag |= DE_MODIFIED;
                    430:                de_changed = 1;
                    431:        }
                    432:
                    433:        if (de_changed) {
                    434:                VN_KNOTE(vp, NOTE_ATTRIB);
1.64      hannken   435:                error = deupdat(dep, 1);
                    436:                if (error)
                    437:                        goto bad;
                    438:        }
                    439:
                    440: bad:
                    441:        fstrans_done(vp->v_mount);
                    442:        return error;
1.1       jdolecek  443: }
                    444:
                    445: int
1.58      dsl       446: msdosfs_read(void *v)
1.1       jdolecek  447: {
                    448:        struct vop_read_args /* {
                    449:                struct vnode *a_vp;
                    450:                struct uio *a_uio;
                    451:                int a_ioflag;
1.28      elad      452:                kauth_cred_t a_cred;
1.1       jdolecek  453:        } */ *ap = v;
1.54      pooka     454:        int error = 0;
1.1       jdolecek  455:        int64_t diff;
                    456:        int blsize;
                    457:        long n;
                    458:        long on;
                    459:        daddr_t lbn;
                    460:        vsize_t bytelen;
                    461:        struct buf *bp;
                    462:        struct vnode *vp = ap->a_vp;
                    463:        struct denode *dep = VTODE(vp);
                    464:        struct msdosfsmount *pmp = dep->de_pmp;
                    465:        struct uio *uio = ap->a_uio;
                    466:
                    467:        /*
                    468:         * If they didn't ask for any data, then we are done.
                    469:         */
                    470:
                    471:        if (uio->uio_resid == 0)
                    472:                return (0);
                    473:        if (uio->uio_offset < 0)
                    474:                return (EINVAL);
                    475:        if (uio->uio_offset >= dep->de_FileSize)
                    476:                return (0);
                    477:
1.64      hannken   478:        fstrans_start(vp->v_mount, FSTRANS_SHARED);
1.1       jdolecek  479:        if (vp->v_type == VREG) {
1.23      yamt      480:                const int advice = IO_ADV_DECODE(ap->a_ioflag);
                    481:
1.1       jdolecek  482:                while (uio->uio_resid > 0) {
                    483:                        bytelen = MIN(dep->de_FileSize - uio->uio_offset,
                    484:                                      uio->uio_resid);
                    485:
                    486:                        if (bytelen == 0)
                    487:                                break;
1.54      pooka     488:                        error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice,
1.55      pooka     489:                            UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp));
1.1       jdolecek  490:                        if (error)
                    491:                                break;
                    492:                }
                    493:                dep->de_flag |= DE_ACCESS;
                    494:                goto out;
                    495:        }
                    496:
                    497:        /* this loop is only for directories now */
                    498:        do {
                    499:                lbn = de_cluster(pmp, uio->uio_offset);
                    500:                on = uio->uio_offset & pmp->pm_crbomask;
                    501:                n = MIN(pmp->pm_bpcluster - on, uio->uio_resid);
                    502:                if (uio->uio_offset >= dep->de_FileSize)
                    503:                        return (0);
                    504:                /* file size (and hence diff) may be up to 4GB */
                    505:                diff = dep->de_FileSize - uio->uio_offset;
                    506:                if (diff < n)
                    507:                        n = (long) diff;
                    508:
1.34      scw       509:                /* convert cluster # to sector # */
1.1       jdolecek  510:                error = pcbmap(dep, lbn, &lbn, 0, &blsize);
                    511:                if (error)
1.64      hannken   512:                        goto bad;
1.1       jdolecek  513:
                    514:                /*
                    515:                 * If we are operating on a directory file then be sure to
                    516:                 * do i/o with the vnode for the filesystem instead of the
                    517:                 * vnode for the directory.
                    518:                 */
1.34      scw       519:                error = bread(pmp->pm_devvp, de_bn2kb(pmp, lbn), blsize,
1.52      hannken   520:                    NOCRED, 0, &bp);
1.1       jdolecek  521:                n = MIN(n, pmp->pm_bpcluster - bp->b_resid);
                    522:                if (error) {
1.42      ad        523:                        brelse(bp, 0);
1.64      hannken   524:                        goto bad;
1.1       jdolecek  525:                }
1.38      christos  526:                error = uiomove((char *)bp->b_data + on, (int) n, uio);
1.42      ad        527:                brelse(bp, 0);
1.1       jdolecek  528:        } while (error == 0 && uio->uio_resid > 0 && n != 0);
1.14      perry     529:
1.1       jdolecek  530: out:
                    531:        if ((ap->a_ioflag & IO_SYNC) == IO_SYNC)
                    532:                error = deupdat(dep, 1);
1.64      hannken   533: bad:
                    534:        fstrans_done(vp->v_mount);
1.1       jdolecek  535:        return (error);
                    536: }
                    537:
                    538: /*
                    539:  * Write data to a file or directory.
                    540:  */
                    541: int
1.58      dsl       542: msdosfs_write(void *v)
1.1       jdolecek  543: {
                    544:        struct vop_write_args /* {
                    545:                struct vnode *a_vp;
                    546:                struct uio *a_uio;
                    547:                int a_ioflag;
1.28      elad      548:                kauth_cred_t a_cred;
1.1       jdolecek  549:        } */ *ap = v;
1.54      pooka     550:        int resid, extended = 0;
1.13      chs       551:        int error = 0;
                    552:        int ioflag = ap->a_ioflag;
1.1       jdolecek  553:        u_long osize;
                    554:        u_long count;
                    555:        vsize_t bytelen;
                    556:        off_t oldoff;
1.74      hannken   557:        size_t rem;
1.1       jdolecek  558:        struct uio *uio = ap->a_uio;
                    559:        struct vnode *vp = ap->a_vp;
                    560:        struct denode *dep = VTODE(vp);
                    561:        struct msdosfsmount *pmp = dep->de_pmp;
1.28      elad      562:        kauth_cred_t cred = ap->a_cred;
1.37      thorpej   563:        bool async;
1.1       jdolecek  564:
                    565: #ifdef MSDOSFS_DEBUG
                    566:        printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
                    567:            vp, uio, ioflag, cred);
                    568:        printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
                    569:            dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
                    570: #endif
                    571:
                    572:        switch (vp->v_type) {
                    573:        case VREG:
                    574:                if (ioflag & IO_APPEND)
                    575:                        uio->uio_offset = dep->de_FileSize;
                    576:                break;
                    577:        case VDIR:
                    578:                return EISDIR;
                    579:        default:
                    580:                panic("msdosfs_write(): bad file type");
                    581:        }
                    582:
                    583:        if (uio->uio_offset < 0)
                    584:                return (EINVAL);
                    585:
                    586:        if (uio->uio_resid == 0)
                    587:                return (0);
                    588:
1.17      xtraeme   589:        /* Don't bother to try to write files larger than the fs limit */
                    590:        if (uio->uio_offset + uio->uio_resid > MSDOSFS_FILESIZE_MAX)
                    591:                return (EFBIG);
                    592:
1.64      hannken   593:        fstrans_start(vp->v_mount, FSTRANS_SHARED);
1.1       jdolecek  594:        /*
                    595:         * If the offset we are starting the write at is beyond the end of
                    596:         * the file, then they've done a seek.  Unix filesystems allow
                    597:         * files with holes in them, DOS doesn't so we must fill the hole
                    598:         * with zeroed blocks.
                    599:         */
                    600:        if (uio->uio_offset > dep->de_FileSize) {
1.64      hannken   601:                if ((error = deextend(dep, uio->uio_offset, cred)) != 0) {
                    602:                        fstrans_done(vp->v_mount);
1.1       jdolecek  603:                        return (error);
1.64      hannken   604:                }
1.1       jdolecek  605:        }
                    606:
                    607:        /*
                    608:         * Remember some values in case the write fails.
                    609:         */
                    610:        async = vp->v_mount->mnt_flag & MNT_ASYNC;
                    611:        resid = uio->uio_resid;
                    612:        osize = dep->de_FileSize;
                    613:
                    614:        /*
                    615:         * If we write beyond the end of the file, extend it to its ultimate
                    616:         * size ahead of the time to hopefully get a contiguous area.
                    617:         */
                    618:        if (uio->uio_offset + resid > osize) {
                    619:                count = de_clcount(pmp, uio->uio_offset + resid) -
                    620:                        de_clcount(pmp, osize);
1.53      pooka     621:                if ((error = extendfile(dep, count, NULL, NULL, 0)))
1.1       jdolecek  622:                        goto errexit;
                    623:
                    624:                dep->de_FileSize = uio->uio_offset + resid;
1.45      reinoud   625:                /* hint uvm to not read in extended part */
                    626:                uvm_vnp_setwritesize(vp, dep->de_FileSize);
1.74      hannken   627:                /* zero out the remainder of the last page */
                    628:                rem = round_page(dep->de_FileSize) - dep->de_FileSize;
                    629:                if (rem > 0)
1.77    ! hannken   630:                        ubc_zerorange(&vp->v_uobj, (off_t)dep->de_FileSize,
        !           631:                            rem, UBC_UNMAP_FLAG(vp));
1.1       jdolecek  632:                extended = 1;
                    633:        }
                    634:
                    635:        do {
                    636:                oldoff = uio->uio_offset;
                    637:                bytelen = uio->uio_resid;
                    638:
1.54      pooka     639:                error = ubc_uiomove(&vp->v_uobj, uio, bytelen,
                    640:                    IO_ADV_DECODE(ioflag), UBC_WRITE | UBC_UNMAP_FLAG(vp));
1.34      scw       641:                if (error)
1.1       jdolecek  642:                        break;
                    643:
                    644:                /*
                    645:                 * flush what we just wrote if necessary.
                    646:                 * XXXUBC simplistic async flushing.
                    647:                 */
                    648:
                    649:                if (!async && oldoff >> 16 != uio->uio_offset >> 16) {
1.76      rmind     650:                        mutex_enter(vp->v_interlock);
1.1       jdolecek  651:                        error = VOP_PUTPAGES(vp, (oldoff >> 16) << 16,
                    652:                            (uio->uio_offset >> 16) << 16, PGO_CLEANIT);
                    653:                }
                    654:        } while (error == 0 && uio->uio_resid > 0);
1.45      reinoud   655:
                    656:        /* set final size */
                    657:        uvm_vnp_setsize(vp, dep->de_FileSize);
1.1       jdolecek  658:        if (error == 0 && ioflag & IO_SYNC) {
1.76      rmind     659:                mutex_enter(vp->v_interlock);
1.1       jdolecek  660:                error = VOP_PUTPAGES(vp, trunc_page(oldoff),
                    661:                    round_page(oldoff + bytelen), PGO_CLEANIT | PGO_SYNCIO);
                    662:        }
                    663:        dep->de_flag |= DE_UPDATE;
                    664:
                    665:        /*
                    666:         * If the write failed and they want us to, truncate the file back
                    667:         * to the size it was before the write was attempted.
                    668:         */
                    669: errexit:
                    670:        if (resid > uio->uio_resid)
                    671:                VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0));
                    672:        if (error) {
1.44      pooka     673:                detrunc(dep, osize, ioflag & IO_SYNC, NOCRED);
1.1       jdolecek  674:                uio->uio_offset -= resid - uio->uio_resid;
                    675:                uio->uio_resid = resid;
                    676:        } else if ((ioflag & IO_SYNC) == IO_SYNC)
                    677:                error = deupdat(dep, 1);
1.64      hannken   678:        fstrans_done(vp->v_mount);
1.1       jdolecek  679:        KASSERT(vp->v_size == dep->de_FileSize);
                    680:        return (error);
                    681: }
                    682:
                    683: int
1.21      yamt      684: msdosfs_update(struct vnode *vp, const struct timespec *acc,
                    685:     const struct timespec *mod, int flags)
1.1       jdolecek  686: {
                    687:        struct buf *bp;
                    688:        struct direntry *dirp;
                    689:        struct denode *dep;
                    690:        int error;
                    691:
1.21      yamt      692:        if (vp->v_mount->mnt_flag & MNT_RDONLY)
1.1       jdolecek  693:                return (0);
1.21      yamt      694:        dep = VTODE(vp);
                    695:        DETIMES(dep, acc, mod, NULL, dep->de_pmp->pm_gmtoff);
1.1       jdolecek  696:        if ((dep->de_flag & DE_MODIFIED) == 0)
                    697:                return (0);
                    698:        dep->de_flag &= ~DE_MODIFIED;
                    699:        if (dep->de_Attributes & ATTR_DIRECTORY)
                    700:                return (0);
                    701:        if (dep->de_refcnt <= 0)
                    702:                return (0);
                    703:        error = readde(dep, &bp, &dirp);
                    704:        if (error)
                    705:                return (error);
                    706:        DE_EXTERNALIZE(dirp, dep);
1.21      yamt      707:        if (flags & (UPDATE_WAIT|UPDATE_DIROP))
1.1       jdolecek  708:                return (bwrite(bp));
                    709:        else {
                    710:                bdwrite(bp);
                    711:                return (0);
                    712:        }
                    713: }
                    714:
                    715: /*
                    716:  * Flush the blocks of a file to disk.
                    717:  *
                    718:  * This function is worthless for vnodes that represent directories. Maybe we
                    719:  * could just do a sync if they try an fsync on a directory file.
                    720:  */
                    721: int
1.58      dsl       722: msdosfs_remove(void *v)
1.1       jdolecek  723: {
                    724:        struct vop_remove_args /* {
                    725:                struct vnode *a_dvp;
                    726:                struct vnode *a_vp;
                    727:                struct componentname *a_cnp;
                    728:        } */ *ap = v;
                    729:        struct denode *dep = VTODE(ap->a_vp);
                    730:        struct denode *ddep = VTODE(ap->a_dvp);
                    731:        int error;
                    732:
1.64      hannken   733:        fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED);
1.1       jdolecek  734:        if (ap->a_vp->v_type == VDIR)
                    735:                error = EPERM;
                    736:        else
                    737:                error = removede(ddep, dep);
                    738: #ifdef MSDOSFS_DEBUG
                    739:        printf("msdosfs_remove(), dep %p, v_usecount %d\n",
                    740:                dep, ap->a_vp->v_usecount);
                    741: #endif
                    742:        VN_KNOTE(ap->a_vp, NOTE_DELETE);
                    743:        VN_KNOTE(ap->a_dvp, NOTE_WRITE);
                    744:        if (ddep == dep)
                    745:                vrele(ap->a_vp);
                    746:        else
                    747:                vput(ap->a_vp); /* causes msdosfs_inactive() to be called
                    748:                                 * via vrele() */
                    749:        vput(ap->a_dvp);
1.64      hannken   750:        fstrans_done(ap->a_dvp->v_mount);
1.1       jdolecek  751:        return (error);
                    752: }
                    753:
                    754: /*
                    755:  * Renames on files require moving the denode to a new hash queue since the
                    756:  * denode's location is used to compute which hash queue to put the file
                    757:  * in. Unless it is a rename in place.  For example "mv a b".
                    758:  *
                    759:  * What follows is the basic algorithm:
                    760:  *
                    761:  * if (file move) {
                    762:  *     if (dest file exists) {
                    763:  *             remove dest file
                    764:  *     }
                    765:  *     if (dest and src in same directory) {
                    766:  *             rewrite name in existing directory slot
                    767:  *     } else {
                    768:  *             write new entry in dest directory
                    769:  *             update offset and dirclust in denode
                    770:  *             move denode to new hash chain
                    771:  *             clear old directory entry
                    772:  *     }
                    773:  * } else {
                    774:  *     directory move
                    775:  *     if (dest directory exists) {
                    776:  *             if (dest is not empty) {
                    777:  *                     return ENOTEMPTY
                    778:  *             }
                    779:  *             remove dest directory
                    780:  *     }
                    781:  *     if (dest and src in same directory) {
                    782:  *             rewrite name in existing entry
                    783:  *     } else {
                    784:  *             be sure dest is not a child of src directory
                    785:  *             write entry in dest directory
                    786:  *             update "." and ".." in moved directory
                    787:  *             update offset and dirclust in denode
                    788:  *             move denode to new hash chain
                    789:  *             clear old directory entry for moved directory
                    790:  *     }
                    791:  * }
                    792:  *
                    793:  * On entry:
                    794:  *     source's parent directory is unlocked
                    795:  *     source file or directory is unlocked
                    796:  *     destination's parent directory is locked
                    797:  *     destination file or directory is locked if it exists
                    798:  *
                    799:  * On exit:
                    800:  *     all denodes should be released
                    801:  *
                    802:  * Notes:
                    803:  * I'm not sure how the memory containing the pathnames pointed at by the
                    804:  * componentname structures is freed, there may be some memory bleeding
                    805:  * for each rename done.
1.43      pooka     806:  *
                    807:  * --More-- Notes:
                    808:  * This routine needs help.  badly.
1.1       jdolecek  809:  */
                    810: int
1.58      dsl       811: msdosfs_rename(void *v)
1.1       jdolecek  812: {
                    813:        struct vop_rename_args /* {
                    814:                struct vnode *a_fdvp;
                    815:                struct vnode *a_fvp;
                    816:                struct componentname *a_fcnp;
                    817:                struct vnode *a_tdvp;
                    818:                struct vnode *a_tvp;
                    819:                struct componentname *a_tcnp;
                    820:        } */ *ap = v;
                    821:        struct vnode *tvp = ap->a_tvp;
                    822:        struct vnode *tdvp = ap->a_tdvp;
                    823:        struct vnode *fvp = ap->a_fvp;
                    824:        struct vnode *fdvp = ap->a_fdvp;
                    825:        struct componentname *tcnp = ap->a_tcnp;
                    826:        struct componentname *fcnp = ap->a_fcnp;
                    827:        struct denode *ip, *xp, *dp, *zp;
1.72      pooka     828:        u_char toname[12], oldname[12];
1.1       jdolecek  829:        u_long from_diroffset, to_diroffset;
                    830:        u_char to_count;
                    831:        int doingdirectory = 0, newparent = 0;
                    832:        int error;
                    833:        u_long cn;
                    834:        daddr_t bn;
                    835:        struct msdosfsmount *pmp;
                    836:        struct direntry *dotdotp;
                    837:        struct buf *bp;
                    838:
                    839:        pmp = VFSTOMSDOSFS(fdvp->v_mount);
                    840:
                    841:        /*
                    842:         * Check for cross-device rename.
                    843:         */
                    844:        if ((fvp->v_mount != tdvp->v_mount) ||
                    845:            (tvp && (fvp->v_mount != tvp->v_mount))) {
                    846:                error = EXDEV;
                    847: abortit:
                    848:                VOP_ABORTOP(tdvp, tcnp);
                    849:                if (tdvp == tvp)
                    850:                        vrele(tdvp);
                    851:                else
                    852:                        vput(tdvp);
                    853:                if (tvp)
                    854:                        vput(tvp);
                    855:                VOP_ABORTOP(fdvp, fcnp);
                    856:                vrele(fdvp);
                    857:                vrele(fvp);
                    858:                return (error);
                    859:        }
                    860:
                    861:        /*
                    862:         * If source and dest are the same, do nothing.
                    863:         */
                    864:        if (tvp == fvp) {
                    865:                error = 0;
                    866:                goto abortit;
                    867:        }
                    868:
1.43      pooka     869:        /*
                    870:         * XXX: This can deadlock since we hold tdvp/tvp locked.
1.49      ad        871:         * But I'm not going to fix it now.
1.43      pooka     872:         */
1.1       jdolecek  873:        if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
                    874:                goto abortit;
                    875:        dp = VTODE(fdvp);
                    876:        ip = VTODE(fvp);
                    877:
                    878:        /*
                    879:         * Be sure we are not renaming ".", "..", or an alias of ".". This
                    880:         * leads to a crippled directory tree.  It's pretty tough to do a
                    881:         * "ls" or "pwd" with the "." directory entry missing, and "cd .."
                    882:         * doesn't work if the ".." entry is missing.
                    883:         */
                    884:        if (ip->de_Attributes & ATTR_DIRECTORY) {
                    885:                /*
                    886:                 * Avoid ".", "..", and aliases of "." for obvious reasons.
                    887:                 */
                    888:                if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
                    889:                    dp == ip ||
                    890:                    (fcnp->cn_flags & ISDOTDOT) ||
                    891:                    (tcnp->cn_flags & ISDOTDOT) ||
                    892:                    (ip->de_flag & DE_RENAME)) {
1.67      hannken   893:                        VOP_UNLOCK(fvp);
1.1       jdolecek  894:                        error = EINVAL;
                    895:                        goto abortit;
                    896:                }
                    897:                ip->de_flag |= DE_RENAME;
                    898:                doingdirectory++;
                    899:        }
                    900:        VN_KNOTE(fdvp, NOTE_WRITE);             /* XXXLUKEM/XXX: right place? */
                    901:
1.64      hannken   902:        fstrans_start(fdvp->v_mount, FSTRANS_SHARED);
1.1       jdolecek  903:        /*
                    904:         * When the target exists, both the directory
                    905:         * and target vnodes are returned locked.
                    906:         */
                    907:        dp = VTODE(tdvp);
                    908:        xp = tvp ? VTODE(tvp) : NULL;
                    909:        /*
                    910:         * Remember direntry place to use for destination
                    911:         */
                    912:        to_diroffset = dp->de_fndoffset;
                    913:        to_count = dp->de_fndcnt;
                    914:
                    915:        /*
                    916:         * If ".." must be changed (ie the directory gets a new
                    917:         * parent) then the source directory must not be in the
                    918:         * directory hierarchy above the target, as this would
                    919:         * orphan everything below the source directory. Also
                    920:         * the user must have write permission in the source so
                    921:         * as to be able to change "..". We must repeat the call
                    922:         * to namei, as the parent directory is unlocked by the
                    923:         * call to doscheckpath().
                    924:         */
1.44      pooka     925:        error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred);
1.67      hannken   926:        VOP_UNLOCK(fvp);
1.1       jdolecek  927:        if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
                    928:                newparent = 1;
1.43      pooka     929:
1.1       jdolecek  930:        if (doingdirectory && newparent) {
                    931:                if (error)      /* write access check above */
1.43      pooka     932:                        goto tdvpbad;
1.1       jdolecek  933:                if (xp != NULL)
                    934:                        vput(tvp);
1.43      pooka     935:                tvp = NULL;
1.1       jdolecek  936:                /*
1.71      dholland  937:                 * doscheckpath() vput()'s tdvp (dp == VTODE(tdvp)),
                    938:                 * so we have to get an extra ref to it first, and
                    939:                 * because it's been unlocked we need to do a relookup
                    940:                 * afterwards in case tvp has changed.
1.1       jdolecek  941:                 */
1.71      dholland  942:                vref(tdvp);
1.1       jdolecek  943:                if ((error = doscheckpath(ip, dp)) != 0)
1.73      hannken   944:                        goto bad;
1.43      pooka     945:                vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY);
1.71      dholland  946:                if ((error = relookup(tdvp, &tvp, tcnp, 0)) != 0) {
1.67      hannken   947:                        VOP_UNLOCK(tdvp);
1.73      hannken   948:                        goto bad;
1.43      pooka     949:                }
1.1       jdolecek  950:                dp = VTODE(tdvp);
                    951:                xp = tvp ? VTODE(tvp) : NULL;
                    952:        }
                    953:
                    954:        if (xp != NULL) {
                    955:                /*
                    956:                 * Target must be empty if a directory and have no links
                    957:                 * to it. Also, ensure source and target are compatible
                    958:                 * (both directories, or both not directories).
                    959:                 */
                    960:                if (xp->de_Attributes & ATTR_DIRECTORY) {
                    961:                        if (!dosdirempty(xp)) {
                    962:                                error = ENOTEMPTY;
1.43      pooka     963:                                goto tdvpbad;
1.1       jdolecek  964:                        }
                    965:                        if (!doingdirectory) {
                    966:                                error = ENOTDIR;
1.43      pooka     967:                                goto tdvpbad;
1.1       jdolecek  968:                        }
                    969:                } else if (doingdirectory) {
                    970:                        error = EISDIR;
1.43      pooka     971:                        goto tdvpbad;
1.1       jdolecek  972:                }
                    973:                if ((error = removede(dp, xp)) != 0)
1.43      pooka     974:                        goto tdvpbad;
1.1       jdolecek  975:                VN_KNOTE(tdvp, NOTE_WRITE);
                    976:                VN_KNOTE(tvp, NOTE_DELETE);
                    977:                cache_purge(tvp);
                    978:                vput(tvp);
1.43      pooka     979:                tvp = NULL;
1.1       jdolecek  980:                xp = NULL;
                    981:        }
                    982:
                    983:        /*
                    984:         * Convert the filename in tcnp into a dos filename. We copy this
                    985:         * into the denode and directory entry for the destination
                    986:         * file/directory.
                    987:         */
1.64      hannken   988:        if ((error = uniqdosname(VTODE(tdvp), tcnp, toname)) != 0) {
                    989:                fstrans_done(fdvp->v_mount);
1.1       jdolecek  990:                goto abortit;
1.64      hannken   991:        }
1.1       jdolecek  992:
                    993:        /*
                    994:         * Since from wasn't locked at various places above,
                    995:         * have to do a relookup here.
                    996:         */
                    997:        fcnp->cn_flags &= ~MODMASK;
                    998:        fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1.67      hannken   999:        VOP_UNLOCK(tdvp);
1.35      chs      1000:        vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY);
1.71      dholland 1001:        if ((error = relookup(fdvp, &fvp, fcnp, 0))) {
1.67      hannken  1002:                VOP_UNLOCK(fdvp);
1.35      chs      1003:                vrele(ap->a_fvp);
                   1004:                vrele(tdvp);
1.64      hannken  1005:                fstrans_done(fdvp->v_mount);
1.35      chs      1006:                return (error);
                   1007:        }
1.1       jdolecek 1008:        if (fvp == NULL) {
                   1009:                /*
                   1010:                 * From name has disappeared.
                   1011:                 */
                   1012:                if (doingdirectory)
                   1013:                        panic("rename: lost dir entry");
1.35      chs      1014:                vput(fdvp);
1.1       jdolecek 1015:                vrele(ap->a_fvp);
                   1016:                vrele(tdvp);
1.64      hannken  1017:                fstrans_done(fdvp->v_mount);
1.1       jdolecek 1018:                return 0;
                   1019:        }
1.67      hannken  1020:        VOP_UNLOCK(fdvp);
1.1       jdolecek 1021:        xp = VTODE(fvp);
                   1022:        zp = VTODE(fdvp);
                   1023:        from_diroffset = zp->de_fndoffset;
                   1024:
                   1025:        /*
                   1026:         * Ensure that the directory entry still exists and has not
                   1027:         * changed till now. If the source is a file the entry may
                   1028:         * have been unlinked or renamed. In either case there is
                   1029:         * no further work to be done. If the source is a directory
                   1030:         * then it cannot have been rmdir'ed or renamed; this is
                   1031:         * prohibited by the DE_RENAME flag.
                   1032:         */
                   1033:        if (xp != ip) {
                   1034:                if (doingdirectory)
                   1035:                        panic("rename: lost dir entry");
                   1036:                vrele(ap->a_fvp);
                   1037:                xp = NULL;
                   1038:        } else {
                   1039:                vrele(fvp);
                   1040:                xp = NULL;
                   1041:
                   1042:                /*
                   1043:                 * First write a new entry in the destination
                   1044:                 * directory and mark the entry in the source directory
                   1045:                 * as deleted.  Then move the denode to the correct hash
                   1046:                 * chain for its new location in the filesystem.  And, if
                   1047:                 * we moved a directory, then update its .. entry to point
                   1048:                 * to the new parent directory.
                   1049:                 */
                   1050:                memcpy(oldname, ip->de_Name, 11);
                   1051:                memcpy(ip->de_Name, toname, 11);        /* update denode */
                   1052:                dp->de_fndoffset = to_diroffset;
                   1053:                dp->de_fndcnt = to_count;
                   1054:                error = createde(ip, dp, (struct denode **)0, tcnp);
                   1055:                if (error) {
                   1056:                        memcpy(ip->de_Name, oldname, 11);
1.67      hannken  1057:                        VOP_UNLOCK(fvp);
1.1       jdolecek 1058:                        goto bad;
                   1059:                }
                   1060:                ip->de_refcnt++;
                   1061:                zp->de_fndoffset = from_diroffset;
                   1062:                if ((error = removede(zp, ip)) != 0) {
                   1063:                        /* XXX should really panic here, fs is corrupt */
1.67      hannken  1064:                        VOP_UNLOCK(fvp);
1.1       jdolecek 1065:                        goto bad;
                   1066:                }
                   1067:                cache_purge(fvp);
                   1068:                if (!doingdirectory) {
                   1069:                        error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0,
                   1070:                                       &ip->de_dirclust, 0);
                   1071:                        if (error) {
                   1072:                                /* XXX should really panic here, fs is corrupt */
1.67      hannken  1073:                                VOP_UNLOCK(fvp);
1.1       jdolecek 1074:                                goto bad;
                   1075:                        }
                   1076:                        ip->de_diroffset = to_diroffset;
                   1077:                        if (ip->de_dirclust != MSDOSFSROOT)
                   1078:                                ip->de_diroffset &= pmp->pm_crbomask;
                   1079:                }
                   1080:                reinsert(ip);
                   1081:        }
                   1082:
                   1083:        /*
                   1084:         * If we moved a directory to a new parent directory, then we must
                   1085:         * fixup the ".." entry in the moved directory.
                   1086:         */
                   1087:        if (doingdirectory && newparent) {
                   1088:                cn = ip->de_StartCluster;
                   1089:                if (cn == MSDOSFSROOT) {
                   1090:                        /* this should never happen */
                   1091:                        panic("msdosfs_rename: updating .. in root directory?");
                   1092:                } else
                   1093:                        bn = cntobn(pmp, cn);
1.34      scw      1094:                error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn),
1.52      hannken  1095:                    pmp->pm_bpcluster, NOCRED, B_MODIFY, &bp);
1.1       jdolecek 1096:                if (error) {
                   1097:                        /* XXX should really panic here, fs is corrupt */
1.42      ad       1098:                        brelse(bp, 0);
1.67      hannken  1099:                        VOP_UNLOCK(fvp);
1.1       jdolecek 1100:                        goto bad;
                   1101:                }
                   1102:                dotdotp = (struct direntry *)bp->b_data + 1;
                   1103:                putushort(dotdotp->deStartCluster, dp->de_StartCluster);
                   1104:                if (FAT32(pmp)) {
                   1105:                        putushort(dotdotp->deHighClust,
                   1106:                                dp->de_StartCluster >> 16);
1.22      christos 1107:                } else {
                   1108:                        putushort(dotdotp->deHighClust, 0);
1.1       jdolecek 1109:                }
                   1110:                if ((error = bwrite(bp)) != 0) {
                   1111:                        /* XXX should really panic here, fs is corrupt */
1.67      hannken  1112:                        VOP_UNLOCK(fvp);
1.1       jdolecek 1113:                        goto bad;
                   1114:                }
                   1115:        }
                   1116:
                   1117:        VN_KNOTE(fvp, NOTE_RENAME);
1.67      hannken  1118:        VOP_UNLOCK(fvp);
1.1       jdolecek 1119: bad:
1.43      pooka    1120:        if (tvp)
1.1       jdolecek 1121:                vput(tvp);
1.43      pooka    1122:        vrele(tdvp);
1.1       jdolecek 1123:        ip->de_flag &= ~DE_RENAME;
1.71      dholland 1124:        vrele(fdvp);
1.1       jdolecek 1125:        vrele(fvp);
1.64      hannken  1126:        fstrans_done(fdvp->v_mount);
1.1       jdolecek 1127:        return (error);
                   1128:
1.43      pooka    1129:        /* XXX: uuuh */
                   1130: tdvpbad:
1.67      hannken  1131:        VOP_UNLOCK(tdvp);
1.43      pooka    1132:        goto bad;
1.1       jdolecek 1133: }
                   1134:
1.2       jdolecek 1135: static const struct {
1.1       jdolecek 1136:        struct direntry dot;
                   1137:        struct direntry dotdot;
                   1138: } dosdirtemplate = {
                   1139:        {       ".       ", "   ",                      /* the . entry */
                   1140:                ATTR_DIRECTORY,                         /* file attribute */
                   1141:                0,                                      /* reserved */
                   1142:                0, { 0, 0 }, { 0, 0 },                  /* create time & date */
                   1143:                { 0, 0 },                               /* access date */
                   1144:                { 0, 0 },                               /* high bits of start cluster */
                   1145:                { 210, 4 }, { 210, 4 },                 /* modify time & date */
                   1146:                { 0, 0 },                               /* startcluster */
                   1147:                { 0, 0, 0, 0 }                          /* filesize */
                   1148:        },
                   1149:        {       "..      ", "   ",                      /* the .. entry */
                   1150:                ATTR_DIRECTORY,                         /* file attribute */
                   1151:                0,                                      /* reserved */
                   1152:                0, { 0, 0 }, { 0, 0 },                  /* create time & date */
                   1153:                { 0, 0 },                               /* access date */
                   1154:                { 0, 0 },                               /* high bits of start cluster */
                   1155:                { 210, 4 }, { 210, 4 },                 /* modify time & date */
                   1156:                { 0, 0 },                               /* startcluster */
                   1157:                { 0, 0, 0, 0 }                          /* filesize */
                   1158:        }
                   1159: };
                   1160:
                   1161: int
1.58      dsl      1162: msdosfs_mkdir(void *v)
1.1       jdolecek 1163: {
                   1164:        struct vop_mkdir_args /* {
                   1165:                struct vnode *a_dvp;
                   1166:                struvt vnode **a_vpp;
                   1167:                struvt componentname *a_cnp;
                   1168:                struct vattr *a_vap;
                   1169:        } */ *ap = v;
                   1170:        struct componentname *cnp = ap->a_cnp;
                   1171:        struct denode ndirent;
                   1172:        struct denode *dep;
                   1173:        struct denode *pdep = VTODE(ap->a_dvp);
                   1174:        int error;
                   1175:        int bn;
                   1176:        u_long newcluster, pcl;
1.52      hannken  1177:        daddr_t lbn;
1.1       jdolecek 1178:        struct direntry *denp;
                   1179:        struct msdosfsmount *pmp = pdep->de_pmp;
                   1180:        struct buf *bp;
                   1181:        int async = pdep->de_pmp->pm_mountp->mnt_flag & MNT_ASYNC;
                   1182:
1.64      hannken  1183:        fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED);
1.1       jdolecek 1184:        /*
                   1185:         * If this is the root directory and there is no space left we
                   1186:         * can't do anything.  This is because the root directory can not
                   1187:         * change size.
                   1188:         */
                   1189:        if (pdep->de_StartCluster == MSDOSFSROOT
                   1190:            && pdep->de_fndoffset >= pdep->de_FileSize) {
                   1191:                error = ENOSPC;
                   1192:                goto bad2;
                   1193:        }
                   1194:
                   1195:        /*
                   1196:         * Allocate a cluster to hold the about to be created directory.
                   1197:         */
                   1198:        error = clusteralloc(pmp, 0, 1, &newcluster, NULL);
                   1199:        if (error)
                   1200:                goto bad2;
                   1201:
                   1202:        memset(&ndirent, 0, sizeof(ndirent));
                   1203:        ndirent.de_pmp = pmp;
                   1204:        ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1.20      christos 1205:        DETIMES(&ndirent, NULL, NULL, NULL, pmp->pm_gmtoff);
1.1       jdolecek 1206:
                   1207:        /*
                   1208:         * Now fill the cluster with the "." and ".." entries. And write
                   1209:         * the cluster to disk.  This way it is there for the parent
                   1210:         * directory to be pointing at if there were a crash.
                   1211:         */
                   1212:        bn = cntobn(pmp, newcluster);
1.52      hannken  1213:        lbn = de_bn2kb(pmp, bn);
1.1       jdolecek 1214:        /* always succeeds */
1.52      hannken  1215:        bp = getblk(pmp->pm_devvp, lbn, pmp->pm_bpcluster, 0, 0);
1.1       jdolecek 1216:        memset(bp->b_data, 0, pmp->pm_bpcluster);
                   1217:        memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate);
                   1218:        denp = (struct direntry *)bp->b_data;
                   1219:        putushort(denp[0].deStartCluster, newcluster);
                   1220:        putushort(denp[0].deCDate, ndirent.de_CDate);
                   1221:        putushort(denp[0].deCTime, ndirent.de_CTime);
                   1222:        denp[0].deCHundredth = ndirent.de_CHun;
                   1223:        putushort(denp[0].deADate, ndirent.de_ADate);
                   1224:        putushort(denp[0].deMDate, ndirent.de_MDate);
                   1225:        putushort(denp[0].deMTime, ndirent.de_MTime);
                   1226:        pcl = pdep->de_StartCluster;
                   1227:        if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
                   1228:                pcl = 0;
                   1229:        putushort(denp[1].deStartCluster, pcl);
                   1230:        putushort(denp[1].deCDate, ndirent.de_CDate);
                   1231:        putushort(denp[1].deCTime, ndirent.de_CTime);
                   1232:        denp[1].deCHundredth = ndirent.de_CHun;
                   1233:        putushort(denp[1].deADate, ndirent.de_ADate);
                   1234:        putushort(denp[1].deMDate, ndirent.de_MDate);
                   1235:        putushort(denp[1].deMTime, ndirent.de_MTime);
                   1236:        if (FAT32(pmp)) {
                   1237:                putushort(denp[0].deHighClust, newcluster >> 16);
                   1238:                putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16);
1.22      christos 1239:        } else {
                   1240:                putushort(denp[0].deHighClust, 0);
                   1241:                putushort(denp[1].deHighClust, 0);
1.1       jdolecek 1242:        }
                   1243:
                   1244:        if (async)
                   1245:                bdwrite(bp);
                   1246:        else if ((error = bwrite(bp)) != 0)
                   1247:                goto bad;
                   1248:
                   1249:        /*
                   1250:         * Now build up a directory entry pointing to the newly allocated
                   1251:         * cluster.  This will be written to an empty slot in the parent
                   1252:         * directory.
                   1253:         */
                   1254:        if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0)
                   1255:                goto bad;
                   1256:
                   1257:        ndirent.de_Attributes = ATTR_DIRECTORY;
                   1258:        ndirent.de_StartCluster = newcluster;
                   1259:        ndirent.de_FileSize = 0;
                   1260:        ndirent.de_dev = pdep->de_dev;
                   1261:        ndirent.de_devvp = pdep->de_devvp;
                   1262:        if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0)
                   1263:                goto bad;
                   1264:        VN_KNOTE(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
                   1265:        vput(ap->a_dvp);
                   1266:        *ap->a_vpp = DETOV(dep);
1.64      hannken  1267:        fstrans_done(ap->a_dvp->v_mount);
1.1       jdolecek 1268:        return (0);
                   1269:
                   1270: bad:
                   1271:        clusterfree(pmp, newcluster, NULL);
                   1272: bad2:
                   1273:        vput(ap->a_dvp);
1.64      hannken  1274:        fstrans_done(ap->a_dvp->v_mount);
1.1       jdolecek 1275:        return (error);
                   1276: }
                   1277:
                   1278: int
1.58      dsl      1279: msdosfs_rmdir(void *v)
1.1       jdolecek 1280: {
                   1281:        struct vop_rmdir_args /* {
                   1282:                struct vnode *a_dvp;
                   1283:                struct vnode *a_vp;
                   1284:                struct componentname *a_cnp;
                   1285:        } */ *ap = v;
                   1286:        struct vnode *vp = ap->a_vp;
                   1287:        struct vnode *dvp = ap->a_dvp;
                   1288:        struct componentname *cnp = ap->a_cnp;
                   1289:        struct denode *ip, *dp;
                   1290:        int error;
                   1291:
                   1292:        ip = VTODE(vp);
                   1293:        dp = VTODE(dvp);
                   1294:        /*
                   1295:         * No rmdir "." please.
                   1296:         */
                   1297:        if (dp == ip) {
                   1298:                vrele(dvp);
                   1299:                vput(vp);
                   1300:                return (EINVAL);
                   1301:        }
1.64      hannken  1302:        fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED);
1.1       jdolecek 1303:        /*
                   1304:         * Verify the directory is empty (and valid).
                   1305:         * (Rmdir ".." won't be valid since
                   1306:         *  ".." will contain a reference to
                   1307:         *  the current directory and thus be
                   1308:         *  non-empty.)
                   1309:         */
                   1310:        error = 0;
                   1311:        if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) {
                   1312:                error = ENOTEMPTY;
                   1313:                goto out;
                   1314:        }
                   1315:        /*
                   1316:         * Delete the entry from the directory.  For dos filesystems this
                   1317:         * gets rid of the directory entry on disk, the in memory copy
                   1318:         * still exists but the de_refcnt is <= 0.  This prevents it from
                   1319:         * being found by deget().  When the vput() on dep is done we give
                   1320:         * up access and eventually msdosfs_reclaim() will be called which
                   1321:         * will remove it from the denode cache.
                   1322:         */
                   1323:        if ((error = removede(dp, ip)) != 0)
                   1324:                goto out;
                   1325:        /*
                   1326:         * This is where we decrement the link count in the parent
                   1327:         * directory.  Since dos filesystems don't do this we just purge
                   1328:         * the name cache and let go of the parent directory denode.
                   1329:         */
                   1330:        VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
                   1331:        cache_purge(dvp);
                   1332:        vput(dvp);
                   1333:        dvp = NULL;
                   1334:        /*
                   1335:         * Truncate the directory that is being deleted.
                   1336:         */
1.44      pooka    1337:        error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred);
1.1       jdolecek 1338:        cache_purge(vp);
                   1339: out:
                   1340:        VN_KNOTE(vp, NOTE_DELETE);
                   1341:        if (dvp)
                   1342:                vput(dvp);
                   1343:        vput(vp);
1.64      hannken  1344:        fstrans_done(ap->a_dvp->v_mount);
1.1       jdolecek 1345:        return (error);
                   1346: }
                   1347:
                   1348: int
1.58      dsl      1349: msdosfs_readdir(void *v)
1.1       jdolecek 1350: {
                   1351:        struct vop_readdir_args /* {
                   1352:                struct vnode *a_vp;
                   1353:                struct uio *a_uio;
1.28      elad     1354:                kauth_cred_t a_cred;
1.1       jdolecek 1355:                int *a_eofflag;
                   1356:                off_t **a_cookies;
                   1357:                int *a_ncookies;
                   1358:        } */ *ap = v;
                   1359:        int error = 0;
                   1360:        int diff;
                   1361:        long n;
                   1362:        int blsize;
                   1363:        long on;
                   1364:        long lost;
                   1365:        long count;
                   1366:        u_long cn;
1.19      christos 1367:        ino_t fileno;
1.1       jdolecek 1368:        u_long dirsperblk;
                   1369:        long bias = 0;
                   1370:        daddr_t bn, lbn;
                   1371:        struct buf *bp;
                   1372:        struct denode *dep = VTODE(ap->a_vp);
                   1373:        struct msdosfsmount *pmp = dep->de_pmp;
                   1374:        struct direntry *dentp;
1.41      rumble   1375:        struct dirent *dirbuf;
1.1       jdolecek 1376:        struct uio *uio = ap->a_uio;
                   1377:        off_t *cookies = NULL;
                   1378:        int ncookies = 0, nc = 0;
                   1379:        off_t offset, uio_off;
                   1380:        int chksum = -1;
                   1381:
                   1382: #ifdef MSDOSFS_DEBUG
                   1383:        printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
                   1384:            ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
                   1385: #endif
                   1386:
                   1387:        /*
                   1388:         * msdosfs_readdir() won't operate properly on regular files since
                   1389:         * it does i/o only with the filesystem vnode, and hence can
                   1390:         * retrieve the wrong block from the buffer cache for a plain file.
                   1391:         * So, fail attempts to readdir() on a plain file.
                   1392:         */
                   1393:        if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
                   1394:                return (ENOTDIR);
                   1395:
                   1396:        /*
                   1397:         * If the user buffer is smaller than the size of one dos directory
                   1398:         * entry or the file offset is not a multiple of the size of a
                   1399:         * directory entry, then we fail the read.
                   1400:         */
                   1401:        count = uio->uio_resid & ~(sizeof(struct direntry) - 1);
                   1402:        offset = uio->uio_offset;
                   1403:        if (count < sizeof(struct direntry) ||
                   1404:            (offset & (sizeof(struct direntry) - 1)))
                   1405:                return (EINVAL);
                   1406:        lost = uio->uio_resid - count;
                   1407:        uio->uio_resid = count;
                   1408:        uio_off = uio->uio_offset;
1.41      rumble   1409:
1.64      hannken  1410:        fstrans_start(ap->a_vp->v_mount, FSTRANS_SHARED);
                   1411:
1.41      rumble   1412:        /* Allocate a temporary dirent buffer. */
                   1413:        dirbuf = malloc(sizeof(struct dirent), M_MSDOSFSTMP, M_WAITOK | M_ZERO);
1.1       jdolecek 1414:
                   1415:        if (ap->a_ncookies) {
1.40      rumble   1416:                nc = uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0);
1.1       jdolecek 1417:                cookies = malloc(nc * sizeof (off_t), M_TEMP, M_WAITOK);
                   1418:                *ap->a_cookies = cookies;
                   1419:        }
                   1420:
                   1421:        dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
                   1422:
                   1423:        /*
                   1424:         * If they are reading from the root directory then, we simulate
                   1425:         * the . and .. entries since these don't exist in the root
                   1426:         * directory.  We also set the offset bias to make up for having to
                   1427:         * simulate these entries. By this I mean that at file offset 64 we
                   1428:         * read the first entry in the root directory that lives on disk.
                   1429:         */
                   1430:        if (dep->de_StartCluster == MSDOSFSROOT
                   1431:            || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
                   1432: #if 0
1.34      scw      1433:                printf("msdosfs_readdir(): going after . or .. in root dir, "
                   1434:                    "offset %" PRIu64 "\n", offset);
1.1       jdolecek 1435: #endif
                   1436:                bias = 2 * sizeof(struct direntry);
                   1437:                if (offset < bias) {
                   1438:                        for (n = (int)offset / sizeof(struct direntry);
                   1439:                             n < 2; n++) {
                   1440:                                if (FAT32(pmp))
1.41      rumble   1441:                                        dirbuf->d_fileno = cntobn(pmp,
1.19      christos 1442:                                             (ino_t)pmp->pm_rootdirblk)
                   1443:                                             * dirsperblk;
1.1       jdolecek 1444:                                else
1.41      rumble   1445:                                        dirbuf->d_fileno = 1;
                   1446:                                dirbuf->d_type = DT_DIR;
1.1       jdolecek 1447:                                switch (n) {
                   1448:                                case 0:
1.41      rumble   1449:                                        dirbuf->d_namlen = 1;
                   1450:                                        strlcpy(dirbuf->d_name, ".",
                   1451:                                            sizeof(dirbuf->d_name));
1.1       jdolecek 1452:                                        break;
                   1453:                                case 1:
1.41      rumble   1454:                                        dirbuf->d_namlen = 2;
                   1455:                                        strlcpy(dirbuf->d_name, "..",
                   1456:                                            sizeof(dirbuf->d_name));
1.1       jdolecek 1457:                                        break;
                   1458:                                }
1.41      rumble   1459:                                dirbuf->d_reclen = _DIRENT_SIZE(dirbuf);
                   1460:                                if (uio->uio_resid < dirbuf->d_reclen)
1.1       jdolecek 1461:                                        goto out;
1.41      rumble   1462:                                error = uiomove(dirbuf, dirbuf->d_reclen, uio);
1.1       jdolecek 1463:                                if (error)
                   1464:                                        goto out;
                   1465:                                offset += sizeof(struct direntry);
                   1466:                                uio_off = offset;
                   1467:                                if (cookies) {
                   1468:                                        *cookies++ = offset;
                   1469:                                        ncookies++;
                   1470:                                        if (ncookies >= nc)
                   1471:                                                goto out;
                   1472:                                }
                   1473:                        }
                   1474:                }
                   1475:        }
                   1476:
                   1477:        while (uio->uio_resid > 0) {
                   1478:                lbn = de_cluster(pmp, offset - bias);
                   1479:                on = (offset - bias) & pmp->pm_crbomask;
                   1480:                n = MIN(pmp->pm_bpcluster - on, uio->uio_resid);
                   1481:                diff = dep->de_FileSize - (offset - bias);
                   1482:                if (diff <= 0)
                   1483:                        break;
                   1484:                n = MIN(n, diff);
                   1485:                if ((error = pcbmap(dep, lbn, &bn, &cn, &blsize)) != 0)
                   1486:                        break;
1.34      scw      1487:                error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), blsize,
1.52      hannken  1488:                    NOCRED, 0, &bp);
1.1       jdolecek 1489:                if (error) {
1.42      ad       1490:                        brelse(bp, 0);
1.64      hannken  1491:                        goto bad;
1.1       jdolecek 1492:                }
                   1493:                n = MIN(n, blsize - bp->b_resid);
                   1494:
                   1495:                /*
                   1496:                 * Convert from dos directory entries to fs-independent
                   1497:                 * directory entries.
                   1498:                 */
1.38      christos 1499:                for (dentp = (struct direntry *)((char *)bp->b_data + on);
                   1500:                     (char *)dentp < (char *)bp->b_data + on + n;
1.1       jdolecek 1501:                     dentp++, offset += sizeof(struct direntry)) {
                   1502: #if 0
                   1503:
                   1504:                        printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
                   1505:                            dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
                   1506: #endif
                   1507:                        /*
                   1508:                         * If this is an unused entry, we can stop.
                   1509:                         */
                   1510:                        if (dentp->deName[0] == SLOT_EMPTY) {
1.42      ad       1511:                                brelse(bp, 0);
1.1       jdolecek 1512:                                goto out;
                   1513:                        }
                   1514:                        /*
                   1515:                         * Skip deleted entries.
                   1516:                         */
                   1517:                        if (dentp->deName[0] == SLOT_DELETED) {
                   1518:                                chksum = -1;
                   1519:                                continue;
                   1520:                        }
                   1521:
                   1522:                        /*
                   1523:                         * Handle Win95 long directory entries
                   1524:                         */
                   1525:                        if (dentp->deAttributes == ATTR_WIN95) {
                   1526:                                if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
                   1527:                                        continue;
1.41      rumble   1528:                                chksum = win2unixfn((struct winentry *)dentp,
                   1529:                                    dirbuf, chksum);
1.1       jdolecek 1530:                                continue;
                   1531:                        }
                   1532:
                   1533:                        /*
                   1534:                         * Skip volume labels
                   1535:                         */
                   1536:                        if (dentp->deAttributes & ATTR_VOLUME) {
                   1537:                                chksum = -1;
                   1538:                                continue;
                   1539:                        }
                   1540:                        /*
                   1541:                         * This computation of d_fileno must match
                   1542:                         * the computation of va_fileid in
                   1543:                         * msdosfs_getattr.
                   1544:                         */
                   1545:                        if (dentp->deAttributes & ATTR_DIRECTORY) {
                   1546:                                fileno = getushort(dentp->deStartCluster);
                   1547:                                if (FAT32(pmp))
1.19      christos 1548:                                        fileno |= ((ino_t)getushort(dentp->deHighClust)) << 16;
1.1       jdolecek 1549:                                /* if this is the root directory */
                   1550:                                if (fileno == MSDOSFSROOT)
                   1551:                                        if (FAT32(pmp))
                   1552:                                                fileno = cntobn(pmp,
1.19      christos 1553:                                                    (ino_t)pmp->pm_rootdirblk)
                   1554:                                                    * dirsperblk;
1.1       jdolecek 1555:                                        else
                   1556:                                                fileno = 1;
                   1557:                                else
                   1558:                                        fileno = cntobn(pmp, fileno) * dirsperblk;
1.41      rumble   1559:                                dirbuf->d_fileno = fileno;
                   1560:                                dirbuf->d_type = DT_DIR;
1.1       jdolecek 1561:                        } else {
1.41      rumble   1562:                                dirbuf->d_fileno =
                   1563:                                    offset / sizeof(struct direntry);
                   1564:                                dirbuf->d_type = DT_REG;
1.1       jdolecek 1565:                        }
                   1566:                        if (chksum != winChksum(dentp->deName))
1.41      rumble   1567:                                dirbuf->d_namlen = dos2unixfn(dentp->deName,
                   1568:                                    (u_char *)dirbuf->d_name,
1.1       jdolecek 1569:                                    pmp->pm_flags & MSDOSFSMNT_SHORTNAME);
                   1570:                        else
1.41      rumble   1571:                                dirbuf->d_name[dirbuf->d_namlen] = 0;
1.1       jdolecek 1572:                        chksum = -1;
1.41      rumble   1573:                        dirbuf->d_reclen = _DIRENT_SIZE(dirbuf);
                   1574:                        if (uio->uio_resid < dirbuf->d_reclen) {
1.42      ad       1575:                                brelse(bp, 0);
1.1       jdolecek 1576:                                goto out;
                   1577:                        }
1.41      rumble   1578:                        error = uiomove(dirbuf, dirbuf->d_reclen, uio);
1.1       jdolecek 1579:                        if (error) {
1.42      ad       1580:                                brelse(bp, 0);
1.1       jdolecek 1581:                                goto out;
                   1582:                        }
                   1583:                        uio_off = offset + sizeof(struct direntry);
                   1584:                        if (cookies) {
                   1585:                                *cookies++ = offset + sizeof(struct direntry);
                   1586:                                ncookies++;
                   1587:                                if (ncookies >= nc) {
1.42      ad       1588:                                        brelse(bp, 0);
1.1       jdolecek 1589:                                        goto out;
                   1590:                                }
                   1591:                        }
                   1592:                }
1.42      ad       1593:                brelse(bp, 0);
1.1       jdolecek 1594:        }
                   1595:
                   1596: out:
                   1597:        uio->uio_offset = uio_off;
                   1598:        uio->uio_resid += lost;
                   1599:        if (dep->de_FileSize - (offset - bias) <= 0)
                   1600:                *ap->a_eofflag = 1;
                   1601:        else
                   1602:                *ap->a_eofflag = 0;
                   1603:
                   1604:        if (ap->a_ncookies) {
                   1605:                if (error) {
                   1606:                        free(*ap->a_cookies, M_TEMP);
                   1607:                        *ap->a_ncookies = 0;
                   1608:                        *ap->a_cookies = NULL;
                   1609:                } else
                   1610:                        *ap->a_ncookies = ncookies;
                   1611:        }
1.64      hannken  1612:
                   1613: bad:
1.41      rumble   1614:        free(dirbuf, M_MSDOSFSTMP);
1.64      hannken  1615:        fstrans_done(ap->a_vp->v_mount);
1.1       jdolecek 1616:        return (error);
                   1617: }
                   1618:
                   1619: /*
                   1620:  * vp  - address of vnode file the file
                   1621:  * bn  - which cluster we are interested in mapping to a filesystem block number.
                   1622:  * vpp - returns the vnode for the block special file holding the filesystem
                   1623:  *      containing the file of interest
                   1624:  * bnp - address of where to return the filesystem relative block number
                   1625:  */
                   1626: int
1.58      dsl      1627: msdosfs_bmap(void *v)
1.1       jdolecek 1628: {
                   1629:        struct vop_bmap_args /* {
                   1630:                struct vnode *a_vp;
                   1631:                daddr_t a_bn;
                   1632:                struct vnode **a_vpp;
                   1633:                daddr_t *a_bnp;
                   1634:                int *a_runp;
                   1635:        } */ *ap = v;
                   1636:        struct denode *dep = VTODE(ap->a_vp);
1.47      christos 1637:        int run, maxrun;
                   1638:        daddr_t runbn;
1.34      scw      1639:        int status;
1.1       jdolecek 1640:
                   1641:        if (ap->a_vpp != NULL)
                   1642:                *ap->a_vpp = dep->de_devvp;
                   1643:        if (ap->a_bnp == NULL)
                   1644:                return (0);
1.47      christos 1645:        status = pcbmap(dep, ap->a_bn, ap->a_bnp, 0, 0);
                   1646:
                   1647:        /*
                   1648:         * From FreeBSD:
                   1649:         * A little kludgy, but we loop calling pcbmap until we
                   1650:         * reach the end of the contiguous piece, or reach MAXPHYS.
                   1651:         * Since it reduces disk I/Os, the "wasted" CPU is put to
                   1652:         * good use (4 to 5 fold sequential read I/O improvement on USB
                   1653:         * drives).
                   1654:         */
                   1655:        if (ap->a_runp != NULL) {
                   1656:                /* taken from ufs_bmap */
                   1657:                maxrun = ulmin(MAXPHYS / dep->de_pmp->pm_bpcluster - 1,
                   1658:                               dep->de_pmp->pm_maxcluster - ap->a_bn);
                   1659:                for (run = 1; run <= maxrun; run++) {
                   1660:                        if (pcbmap(dep, ap->a_bn + run, &runbn, NULL, NULL)
                   1661:                            != 0 || runbn !=
                   1662:                                    *ap->a_bnp + de_cn2bn(dep->de_pmp, run))
                   1663:                                break;
                   1664:                }
                   1665:                *ap->a_runp = run - 1;
1.1       jdolecek 1666:        }
1.47      christos 1667:
1.34      scw      1668:        /*
                   1669:         * We need to scale *ap->a_bnp by sector_size/DEV_BSIZE
                   1670:         */
                   1671:        *ap->a_bnp = de_bn2kb(dep->de_pmp, *ap->a_bnp);
                   1672:        return status;
1.1       jdolecek 1673: }
                   1674:
                   1675: int
1.58      dsl      1676: msdosfs_strategy(void *v)
1.1       jdolecek 1677: {
                   1678:        struct vop_strategy_args /* {
1.9       hannken  1679:                struct vnode *a_vp;
1.1       jdolecek 1680:                struct buf *a_bp;
                   1681:        } */ *ap = v;
1.9       hannken  1682:        struct vnode *vp = ap->a_vp;
1.1       jdolecek 1683:        struct buf *bp = ap->a_bp;
                   1684:        struct denode *dep = VTODE(bp->b_vp);
                   1685:        int error = 0;
                   1686:
1.9       hannken  1687:        if (vp->v_type == VBLK || vp->v_type == VCHR)
1.1       jdolecek 1688:                panic("msdosfs_strategy: spec");
                   1689:        /*
                   1690:         * If we don't already know the filesystem relative block number
                   1691:         * then get it using pcbmap().  If pcbmap() returns the block
                   1692:         * number as -1 then we've got a hole in the file.  DOS filesystems
                   1693:         * don't allow files with holes, so we shouldn't ever see this.
                   1694:         */
                   1695:        if (bp->b_blkno == bp->b_lblkno) {
                   1696:                error = pcbmap(dep, de_bn2cn(dep->de_pmp, bp->b_lblkno),
                   1697:                               &bp->b_blkno, 0, 0);
                   1698:                if (error)
                   1699:                        bp->b_blkno = -1;
                   1700:                if (bp->b_blkno == -1)
                   1701:                        clrbuf(bp);
1.34      scw      1702:                else
                   1703:                        bp->b_blkno = de_bn2kb(dep->de_pmp, bp->b_blkno);
1.1       jdolecek 1704:        }
                   1705:        if (bp->b_blkno == -1) {
                   1706:                biodone(bp);
                   1707:                return (error);
                   1708:        }
                   1709:
                   1710:        /*
                   1711:         * Read/write the block from/to the disk that contains the desired
                   1712:         * file block.
                   1713:         */
                   1714:
                   1715:        vp = dep->de_devvp;
1.8       hannken  1716:        return (VOP_STRATEGY(vp, bp));
1.1       jdolecek 1717: }
                   1718:
                   1719: int
1.58      dsl      1720: msdosfs_print(void *v)
1.1       jdolecek 1721: {
                   1722:        struct vop_print_args /* {
                   1723:                struct vnode *vp;
                   1724:        } */ *ap = v;
                   1725:        struct denode *dep = VTODE(ap->a_vp);
                   1726:
                   1727:        printf(
                   1728:            "tag VT_MSDOSFS, startcluster %ld, dircluster %ld, diroffset %ld ",
                   1729:            dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
1.56      christos 1730:        printf(" dev %llu, %llu ", (unsigned long long)major(dep->de_dev),
                   1731:            (unsigned long long)minor(dep->de_dev));
1.1       jdolecek 1732:        printf("\n");
                   1733:        return (0);
                   1734: }
                   1735:
                   1736: int
1.58      dsl      1737: msdosfs_advlock(void *v)
1.1       jdolecek 1738: {
                   1739:        struct vop_advlock_args /* {
                   1740:                struct vnode *a_vp;
1.11      jrf      1741:                void *a_id;
1.1       jdolecek 1742:                int a_op;
                   1743:                struct flock *a_fl;
                   1744:                int a_flags;
                   1745:        } */ *ap = v;
                   1746:        struct denode *dep = VTODE(ap->a_vp);
                   1747:
                   1748:        return lf_advlock(ap, &dep->de_lockf, dep->de_FileSize);
                   1749: }
                   1750:
                   1751: int
1.58      dsl      1752: msdosfs_pathconf(void *v)
1.1       jdolecek 1753: {
                   1754:        struct vop_pathconf_args /* {
                   1755:                struct vnode *a_vp;
                   1756:                int a_name;
                   1757:                register_t *a_retval;
                   1758:        } */ *ap = v;
                   1759:
                   1760:        switch (ap->a_name) {
                   1761:        case _PC_LINK_MAX:
                   1762:                *ap->a_retval = 1;
                   1763:                return (0);
                   1764:        case _PC_NAME_MAX:
1.12      jdolecek 1765:                *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax;
1.1       jdolecek 1766:                return (0);
                   1767:        case _PC_PATH_MAX:
                   1768:                *ap->a_retval = PATH_MAX;
                   1769:                return (0);
                   1770:        case _PC_CHOWN_RESTRICTED:
                   1771:                *ap->a_retval = 1;
                   1772:                return (0);
                   1773:        case _PC_NO_TRUNC:
                   1774:                *ap->a_retval = 0;
                   1775:                return (0);
                   1776:        case _PC_SYNC_IO:
                   1777:                *ap->a_retval = 1;
                   1778:                return (0);
                   1779:        case _PC_FILESIZEBITS:
                   1780:                *ap->a_retval = 32;
                   1781:                return (0);
                   1782:        default:
                   1783:                return (EINVAL);
                   1784:        }
                   1785:        /* NOTREACHED */
                   1786: }
                   1787:
1.21      yamt     1788: int
1.58      dsl      1789: msdosfs_fsync(void *v)
1.21      yamt     1790: {
                   1791:        struct vop_fsync_args /* {
                   1792:                struct vnode *a_vp;
1.28      elad     1793:                kauth_cred_t a_cred;
1.21      yamt     1794:                int a_flags;
                   1795:                off_t offlo;
                   1796:                off_t offhi;
                   1797:        } */ *ap = v;
                   1798:        struct vnode *vp = ap->a_vp;
                   1799:        int wait;
                   1800:        int error;
                   1801:
1.64      hannken  1802:        fstrans_start(vp->v_mount, FSTRANS_LAZY);
1.21      yamt     1803:        wait = (ap->a_flags & FSYNC_WAIT) != 0;
1.75      hannken  1804:        error = vflushbuf(vp, wait);
                   1805:        if (error == 0 && (ap->a_flags & FSYNC_DATAONLY) == 0)
1.21      yamt     1806:                error = msdosfs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0);
                   1807:
                   1808:        if (error == 0 && ap->a_flags & FSYNC_CACHE) {
                   1809:                struct denode *dep = VTODE(vp);
                   1810:                struct vnode *devvp = dep->de_devvp;
                   1811:
                   1812:                int l = 0;
                   1813:                error = VOP_IOCTL(devvp, DIOCCACHESYNC, &l, FWRITE,
1.44      pooka    1814:                                          curlwp->l_cred);
1.21      yamt     1815:        }
1.64      hannken  1816:        fstrans_done(vp->v_mount);
1.21      yamt     1817:
                   1818:        return (error);
                   1819: }
                   1820:
1.20      christos 1821: void
                   1822: msdosfs_detimes(struct denode *dep, const struct timespec *acc,
                   1823:     const struct timespec *mod, const struct timespec *cre, int gmtoff)
                   1824: {
                   1825:        struct timespec *ts = NULL, tsb;
                   1826:
                   1827:        KASSERT(dep->de_flag & (DE_UPDATE | DE_CREATE | DE_ACCESS));
1.29      kardel   1828:        /* XXX just call getnanotime early and use result if needed? */
1.20      christos 1829:        dep->de_flag |= DE_MODIFIED;
                   1830:        if (dep->de_flag & DE_UPDATE) {
1.29      kardel   1831:                if (mod == NULL) {
                   1832:                        getnanotime(&tsb);
                   1833:                        mod = ts = &tsb;
                   1834:                }
1.20      christos 1835:                unix2dostime(mod, gmtoff, &dep->de_MDate, &dep->de_MTime, NULL);
                   1836:                dep->de_Attributes |= ATTR_ARCHIVE;
                   1837:        }
                   1838:        if ((dep->de_pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0) {
                   1839:                if (dep->de_flag & DE_ACCESS)  {
                   1840:                        if (acc == NULL)
1.29      kardel   1841:                                acc = ts == NULL ?
                   1842:                                    (getnanotime(&tsb), ts = &tsb) : ts;
1.20      christos 1843:                        unix2dostime(acc, gmtoff, &dep->de_ADate, NULL, NULL);
                   1844:                }
                   1845:                if (dep->de_flag & DE_CREATE) {
                   1846:                        if (cre == NULL)
1.29      kardel   1847:                                cre = ts == NULL ?
                   1848:                                    (getnanotime(&tsb), ts = &tsb) : ts;
1.20      christos 1849:                        unix2dostime(cre, gmtoff, &dep->de_CDate,
                   1850:                            &dep->de_CTime, &dep->de_CHun);
                   1851:                }
                   1852:        }
                   1853:
                   1854:        dep->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS);
                   1855: }
                   1856:
1.1       jdolecek 1857: /* Global vfs data structures for msdosfs */
1.18      xtraeme  1858: int (**msdosfs_vnodeop_p)(void *);
1.1       jdolecek 1859: const struct vnodeopv_entry_desc msdosfs_vnodeop_entries[] = {
                   1860:        { &vop_default_desc, vn_default_error },
                   1861:        { &vop_lookup_desc, msdosfs_lookup },           /* lookup */
                   1862:        { &vop_create_desc, msdosfs_create },           /* create */
1.63      pooka    1863:        { &vop_mknod_desc, genfs_eopnotsupp },          /* mknod */
1.62      pooka    1864:        { &vop_open_desc, genfs_nullop },               /* open */
1.1       jdolecek 1865:        { &vop_close_desc, msdosfs_close },             /* close */
                   1866:        { &vop_access_desc, msdosfs_access },           /* access */
                   1867:        { &vop_getattr_desc, msdosfs_getattr },         /* getattr */
                   1868:        { &vop_setattr_desc, msdosfs_setattr },         /* setattr */
                   1869:        { &vop_read_desc, msdosfs_read },               /* read */
                   1870:        { &vop_write_desc, msdosfs_write },             /* write */
                   1871:        { &vop_fcntl_desc, genfs_fcntl },               /* fcntl */
                   1872:        { &vop_ioctl_desc, msdosfs_ioctl },             /* ioctl */
                   1873:        { &vop_poll_desc, msdosfs_poll },               /* poll */
                   1874:        { &vop_kqfilter_desc, genfs_kqfilter },         /* kqfilter */
                   1875:        { &vop_revoke_desc, msdosfs_revoke },           /* revoke */
                   1876:        { &vop_mmap_desc, msdosfs_mmap },               /* mmap */
                   1877:        { &vop_fsync_desc, msdosfs_fsync },             /* fsync */
                   1878:        { &vop_seek_desc, msdosfs_seek },               /* seek */
                   1879:        { &vop_remove_desc, msdosfs_remove },           /* remove */
1.63      pooka    1880:        { &vop_link_desc, genfs_eopnotsupp },           /* link */
1.1       jdolecek 1881:        { &vop_rename_desc, msdosfs_rename },           /* rename */
                   1882:        { &vop_mkdir_desc, msdosfs_mkdir },             /* mkdir */
                   1883:        { &vop_rmdir_desc, msdosfs_rmdir },             /* rmdir */
1.63      pooka    1884:        { &vop_symlink_desc, genfs_eopnotsupp },        /* symlink */
1.1       jdolecek 1885:        { &vop_readdir_desc, msdosfs_readdir },         /* readdir */
1.62      pooka    1886:        { &vop_readlink_desc, genfs_einval },           /* readlink */
1.1       jdolecek 1887:        { &vop_abortop_desc, msdosfs_abortop },         /* abortop */
                   1888:        { &vop_inactive_desc, msdosfs_inactive },       /* inactive */
                   1889:        { &vop_reclaim_desc, msdosfs_reclaim },         /* reclaim */
                   1890:        { &vop_lock_desc, genfs_lock },                 /* lock */
                   1891:        { &vop_unlock_desc, genfs_unlock },             /* unlock */
                   1892:        { &vop_bmap_desc, msdosfs_bmap },               /* bmap */
                   1893:        { &vop_strategy_desc, msdosfs_strategy },       /* strategy */
                   1894:        { &vop_print_desc, msdosfs_print },             /* print */
                   1895:        { &vop_islocked_desc, genfs_islocked },         /* islocked */
                   1896:        { &vop_pathconf_desc, msdosfs_pathconf },       /* pathconf */
                   1897:        { &vop_advlock_desc, msdosfs_advlock },         /* advlock */
                   1898:        { &vop_bwrite_desc, vn_bwrite },                /* bwrite */
                   1899:        { &vop_getpages_desc, genfs_getpages },         /* getpages */
                   1900:        { &vop_putpages_desc, genfs_putpages },         /* putpages */
                   1901:        { NULL, NULL }
                   1902: };
                   1903: const struct vnodeopv_desc msdosfs_vnodeop_opv_desc =
                   1904:        { &msdosfs_vnodeop_p, msdosfs_vnodeop_entries };

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