2 /* $NetBSD: msdosfs_lookup.c,v 1.37 1997/11/17 15:36:54 ws Exp $ */
5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by TooLs GmbH.
21 * 4. The name of TooLs GmbH may not be used to endorse or promote products
22 * derived from this software without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 * Written by Paul Popelka (paulp@uts.amdahl.com)
38 * You can do anything you want with this software, just don't say you wrote
39 * it, and don't remove this notice.
41 * This software is provided "as is".
43 * The author supplies this software to be publicly redistributed on the
44 * understanding that the author is not responsible for the correct
45 * functioning of this software in any circumstances and is not liable for
46 * any damages caused by this software.
51 #include <sys/param.h>
52 #include <sys/systm.h>
54 #include <sys/mount.h>
55 #include <sys/namei.h>
56 #include <sys/vnode.h>
58 #include <fs/msdosfs/bpb.h>
59 #include <fs/msdosfs/direntry.h>
60 #include <fs/msdosfs/denode.h>
61 #include <fs/msdosfs/fat.h>
62 #include <fs/msdosfs/msdosfsmount.h>
65 * When we search a directory the blocks containing directory entries are
66 * read and examined. The directory entries contain information that would
67 * normally be in the inode of a unix filesystem. This means that some of
68 * a directory's contents may also be in memory resident denodes (sort of
69 * an inode). This can cause problems if we are searching while some other
70 * process is modifying a directory. To prevent one process from accessing
71 * incompletely modified directory information we depend upon being the
72 * sole owner of a directory block. bread/brelse provide this service.
73 * This being the case, when a process modifies a directory it must first
74 * acquire the disk block that contains the directory entry to be modified.
75 * Then update the disk block and the denode, and then write the disk block
76 * out to disk. This way disk blocks containing directory entries and in
77 * memory denode's will be in synch.
81 struct vop_cachedlookup_args /* {
84 struct componentname *a_cnp;
88 struct vnode *vdp = ap->a_dvp;
89 struct vnode **vpp = ap->a_vpp;
90 struct componentname *cnp = ap->a_cnp;
100 int isadir; /* ~0 if found direntry is a directory */
101 u_long scn; /* starting cluster number */
105 struct msdosfsmount *pmp;
107 struct direntry *dep = NULL;
108 u_char dosfilename[12];
109 int flags = cnp->cn_flags;
110 int nameiop = cnp->cn_nameiop;
111 struct thread *td = cnp->cn_thread;
115 int chksum = -1, chksum_ok;
119 printf("msdosfs_lookup(): looking for %s\n", cnp->cn_nameptr);
125 printf("msdosfs_lookup(): vdp %p, dp %p, Attr %02x\n",
126 vdp, dp, dp->de_Attributes);
130 * If they are going after the . or .. entry in the root directory,
131 * they won't find it. DOS filesystems don't have them in the root
132 * directory. So, we fake it. deget() is in on this scam too.
134 if ((vdp->v_vflag & VV_ROOT) && cnp->cn_nameptr[0] == '.' &&
135 (cnp->cn_namelen == 1 ||
136 (cnp->cn_namelen == 2 && cnp->cn_nameptr[1] == '.'))) {
137 isadir = ATTR_DIRECTORY;
140 printf("msdosfs_lookup(): looking for . or .. in root directory\n");
142 cluster = MSDOSFSROOT;
143 blkoff = MSDOSFSROOT_OFS;
147 switch (unix2dosfn((const u_char *)cnp->cn_nameptr, dosfilename,
148 cnp->cn_namelen, 0, pmp)) {
154 wincnt = winSlotCnt((const u_char *)cnp->cn_nameptr,
155 cnp->cn_namelen, pmp) + 1;
159 wincnt = winSlotCnt((const u_char *)cnp->cn_nameptr,
160 cnp->cn_namelen, pmp) + 1;
163 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) {
167 unlen = winLenFixup(cnp->cn_nameptr, cnp->cn_namelen);
170 * Suppress search for slots unless creating
171 * file and at end of pathname, in which case
172 * we watch for a place to put the new file in
173 * case it doesn't already exist.
176 if ((nameiop == CREATE || nameiop == RENAME) &&
181 printf("msdosfs_lookup(): dos version of filename %s, length %ld\n",
182 dosfilename, cnp->cn_namelen);
185 * Search the directory pointed at by vdp for the name pointed at
186 * by cnp->cn_nameptr.
191 * The outer loop ranges over the clusters that make up the
192 * directory. Note that the root directory is different from all
193 * other directories. It has a fixed number of blocks that are not
194 * part of the pool of allocatable clusters. So, we treat it a
195 * little differently. The root directory starts at "cluster" 0.
198 for (frcn = 0;; frcn++) {
199 error = pcbmap(dp, frcn, &bn, &cluster, &blsize);
205 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp);
210 for (blkoff = 0; blkoff < blsize;
211 blkoff += sizeof(struct direntry),
212 diroff += sizeof(struct direntry)) {
213 dep = (struct direntry *)(bp->b_data + blkoff);
215 * If the slot is empty and we are still looking
216 * for an empty then remember this one. If the
217 * slot is not empty then check to see if it
218 * matches what we are looking for. If the slot
219 * has never been filled with anything, then the
220 * remainder of the directory has never been used,
221 * so there is no point in searching it.
223 if (dep->deName[0] == SLOT_EMPTY ||
224 dep->deName[0] == SLOT_DELETED) {
226 * Drop memory of previous long matches
231 if (slotcount < wincnt) {
235 if (dep->deName[0] == SLOT_EMPTY) {
241 * If there wasn't enough space for our winentries,
242 * forget about the empty space
244 if (slotcount < wincnt)
248 * Check for Win95 long filename entry
250 if (dep->deAttributes == ATTR_WIN95) {
251 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
254 chksum = win2unixfn(&nb,
255 (struct winentry *)dep, chksum,
260 chksum = winChkName(&nb,
261 (const u_char *)cnp->cn_nameptr, unlen,
269 * Ignore volume labels (anywhere, not just
270 * the root directory).
272 if (dep->deAttributes & ATTR_VOLUME) {
278 * Check for a checksum or name match
280 chksum_ok = (chksum == winChksum(dep));
282 && (!olddos || bcmp(dosfilename, dep->deName, 11))) {
287 printf("msdosfs_lookup(): match blkoff %d, diroff %d\n",
291 * Remember where this directory
292 * entry came from for whoever did
295 dp->de_fndoffset = diroff;
296 if (chksum_ok && nameiop == RENAME) {
298 * Target had correct long name
299 * directory entries, reuse them
302 dp->de_fndcnt = wincnt - 1;
305 * Long name directory entries
306 * not present or corrupt, can only
307 * reuse dos directory entry.
314 } /* for (blkoff = 0; .... */
316 * Release the buffer holding the directory cluster just
320 } /* for (frcn = 0; ; frcn++) */
324 * We hold no disk buffers at this point.
328 * Fixup the slot description to point to the place where
329 * we might put the new DOS direntry (putting the Win95
330 * long name entries before that)
336 if (wincnt > slotcount)
337 slotoffset += sizeof(struct direntry) * (wincnt - slotcount);
340 * If we get here we didn't find the entry we were looking for. But
341 * that's ok if we are creating or renaming and are at the end of
342 * the pathname and the directory hasn't been removed.
345 printf("msdosfs_lookup(): op %d, refcnt %ld\n",
346 nameiop, dp->de_refcnt);
347 printf(" slotcount %d, slotoffset %d\n",
348 slotcount, slotoffset);
350 if ((nameiop == CREATE || nameiop == RENAME) &&
351 (flags & ISLASTCN) && dp->de_refcnt != 0) {
353 * Access for write is interpreted as allowing
354 * creation of files in the directory.
356 error = VOP_ACCESS(vdp, VWRITE, cnp->cn_cred, cnp->cn_thread);
360 * Return an indication of where the new directory
361 * entry should be put.
363 dp->de_fndoffset = slotoffset;
364 dp->de_fndcnt = wincnt - 1;
367 * We return with the directory locked, so that
368 * the parameters we set up above will still be
369 * valid if we actually decide to do a direnter().
370 * We return ni_vp == NULL to indicate that the entry
371 * does not currently exist; we leave a pointer to
372 * the (locked) directory inode in ndp->ni_dvp.
373 * The pathname buffer is saved so that the name
374 * can be obtained later.
376 * NB - if the directory is unlocked, then this
377 * information cannot be used.
379 cnp->cn_flags |= SAVENAME;
380 return (EJUSTRETURN);
384 * Insert name into cache (as non-existent) if appropriate.
386 * XXX Negative caching is broken for msdosfs because the name
387 * cache doesn't understand peculiarities such as case insensitivity
388 * and 8.3 filenames. Hence, it may not invalidate all negative
389 * entries if a file with this name is later created.
391 if ((cnp->cn_flags & MAKEENTRY) && nameiop != CREATE)
392 cache_enter(vdp, *vpp, cnp);
398 * NOTE: We still have the buffer with matched directory entry at
401 isadir = dep->deAttributes & ATTR_DIRECTORY;
402 scn = getushort(dep->deStartCluster);
404 scn |= getushort(dep->deHighClust) << 16;
405 if (scn == pmp->pm_rootdirblk) {
407 * There should actually be 0 here.
408 * Just ignore the error.
416 if (cluster == MSDOSFSROOT)
417 blkoff = MSDOSFSROOT_OFS;
420 } else if (cluster == MSDOSFSROOT)
424 * Now release buf to allow deget to read the entry again.
425 * Reserving it here and giving it to deget could result
433 * If we entered at foundroot, then we are looking for the . or ..
434 * entry of the filesystems root directory. isadir and scn were
435 * setup before jumping here. And, bp is already null.
437 if (FAT32(pmp) && scn == MSDOSFSROOT)
438 scn = pmp->pm_rootdirblk;
441 * If deleting, and at end of pathname, return
442 * parameters which can be used to remove file.
444 if (nameiop == DELETE && (flags & ISLASTCN)) {
446 * Don't allow deleting the root.
448 if (blkoff == MSDOSFSROOT_OFS)
449 return EROFS; /* really? XXX */
452 * Write access to directory required to delete files.
454 error = VOP_ACCESS(vdp, VWRITE, cnp->cn_cred, cnp->cn_thread);
459 * Return pointer to current entry in dp->i_offset.
460 * Save directory inode pointer in ndp->ni_dvp for dirremove().
462 if (dp->de_StartCluster == scn && isadir) { /* "." */
467 error = deget(pmp, cluster, blkoff, &tdp);
475 * If rewriting (RENAME), return the inode and the
476 * information required to rewrite the present directory
477 * Must get inode of directory entry to verify it's a
478 * regular file, or empty directory.
480 if (nameiop == RENAME && (flags & ISLASTCN)) {
481 if (blkoff == MSDOSFSROOT_OFS)
482 return EROFS; /* really? XXX */
484 error = VOP_ACCESS(vdp, VWRITE, cnp->cn_cred, cnp->cn_thread);
489 * Careful about locking second inode.
490 * This can only occur if the target is ".".
492 if (dp->de_StartCluster == scn && isadir)
495 if ((error = deget(pmp, cluster, blkoff, &tdp)) != 0)
498 cnp->cn_flags |= SAVENAME;
503 * Step through the translation in the name. We do not `vput' the
504 * directory because we may need it again if a symbolic link
505 * is relative to the current directory. Instead we save it
506 * unlocked as "pdp". We must get the target inode before unlocking
507 * the directory to insure that the inode will not be removed
508 * before we get it. We prevent deadlock by always fetching
509 * inodes from the root, moving down the directory tree. Thus
510 * when following backward pointers ".." we must unlock the
511 * parent directory before getting the requested directory.
512 * There is a potential race condition here if both the current
513 * and parent directories are removed before the VFS_VGET for the
514 * inode associated with ".." returns. We hope that this occurs
515 * infrequently since we cannot avoid this race condition without
516 * implementing a sophisticated deadlock detection algorithm.
517 * Note also that this simple deadlock detection scheme will not
518 * work if the filesystem has any hard links other than ".."
519 * that point backwards in the directory structure.
522 if (flags & ISDOTDOT) {
523 VOP_UNLOCK(pdp, 0, td);
524 error = deget(pmp, cluster, blkoff, &tdp);
525 vn_lock(pdp, LK_EXCLUSIVE | LK_RETRY, td);
529 } else if (dp->de_StartCluster == scn && isadir) {
530 VREF(vdp); /* we want ourself, ie "." */
533 if ((error = deget(pmp, cluster, blkoff, &tdp)) != 0)
539 * Insert name into cache if appropriate.
541 if (cnp->cn_flags & MAKEENTRY)
542 cache_enter(vdp, *vpp, cnp);
547 * dep - directory entry to copy into the directory
548 * ddep - directory to add to
549 * depp - return the address of the denode for the created directory entry
551 * cnp - componentname needed for Win95 long filenames
554 createde(dep, ddep, depp, cnp)
557 struct denode **depp;
558 struct componentname *cnp;
561 u_long dirclust, diroffset;
562 struct direntry *ndep;
563 struct msdosfsmount *pmp = ddep->de_pmp;
569 printf("createde(dep %p, ddep %p, depp %p, cnp %p)\n",
570 dep, ddep, depp, cnp);
574 * If no space left in the directory then allocate another cluster
575 * and chain it onto the end of the file. There is one exception
576 * to this. That is, if the root directory has no more space it
577 * can NOT be expanded. extendfile() checks for and fails attempts
578 * to extend the root directory. We just return an error in that
581 if (ddep->de_fndoffset >= ddep->de_FileSize) {
582 diroffset = ddep->de_fndoffset + sizeof(struct direntry)
584 dirclust = de_clcount(pmp, diroffset);
585 error = extendfile(ddep, dirclust, 0, 0, DE_CLEAR);
587 (void)detrunc(ddep, ddep->de_FileSize, 0, NOCRED, NULL);
592 * Update the size of the directory
594 ddep->de_FileSize += de_cn2off(pmp, dirclust);
598 * We just read in the cluster with space. Copy the new directory
599 * entry in. Then write it to disk. NOTE: DOS directories
600 * do not get smaller as clusters are emptied.
602 error = pcbmap(ddep, de_cluster(pmp, ddep->de_fndoffset),
603 &bn, &dirclust, &blsize);
606 diroffset = ddep->de_fndoffset;
607 if (dirclust != MSDOSFSROOT)
608 diroffset &= pmp->pm_crbomask;
609 if ((error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp)) != 0) {
613 ndep = bptoep(pmp, bp, ddep->de_fndoffset);
615 DE_EXTERNALIZE(ndep, dep);
618 * Now write the Win95 long name
620 if (ddep->de_fndcnt > 0) {
621 u_int8_t chksum = winChksum(ndep);
622 const u_char *un = (const u_char *)cnp->cn_nameptr;
623 int unlen = cnp->cn_namelen;
626 while (--ddep->de_fndcnt >= 0) {
627 if (!(ddep->de_fndoffset & pmp->pm_crbomask)) {
628 if ((error = bwrite(bp)) != 0)
631 ddep->de_fndoffset -= sizeof(struct direntry);
639 error = bread(pmp->pm_devvp, bn, blsize,
645 ndep = bptoep(pmp, bp, ddep->de_fndoffset);
648 ddep->de_fndoffset -= sizeof(struct direntry);
650 if (!unix2winfn(un, unlen, (struct winentry *)ndep,
656 if ((error = bwrite(bp)) != 0)
660 * If they want us to return with the denode gotten.
663 if (dep->de_Attributes & ATTR_DIRECTORY) {
664 dirclust = dep->de_StartCluster;
665 if (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)
666 dirclust = MSDOSFSROOT;
667 if (dirclust == MSDOSFSROOT)
668 diroffset = MSDOSFSROOT_OFS;
672 return deget(pmp, dirclust, diroffset, depp);
679 * Be sure a directory is empty except for "." and "..". Return 1 if empty,
680 * return 0 if not empty or error.
691 struct msdosfsmount *pmp = dep->de_pmp;
692 struct direntry *dentp;
695 * Since the filesize field in directory entries for a directory is
696 * zero, we just have to feel our way through the directory until
697 * we hit end of file.
699 for (cn = 0;; cn++) {
700 if ((error = pcbmap(dep, cn, &bn, 0, &blsize)) != 0) {
702 return (1); /* it's empty */
705 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp);
710 for (dentp = (struct direntry *)bp->b_data;
711 (char *)dentp < bp->b_data + blsize;
713 if (dentp->deName[0] != SLOT_DELETED &&
714 (dentp->deAttributes & ATTR_VOLUME) == 0) {
716 * In dos directories an entry whose name
717 * starts with SLOT_EMPTY (0) starts the
718 * beginning of the unused part of the
719 * directory, so we can just return that it
722 if (dentp->deName[0] == SLOT_EMPTY) {
727 * Any names other than "." and ".." in a
728 * directory mean it is not empty.
730 if (bcmp(dentp->deName, ". ", 11) &&
731 bcmp(dentp->deName, ".. ", 11)) {
734 printf("dosdirempty(): entry found %02x, %02x\n",
735 dentp->deName[0], dentp->deName[1]);
737 return (0); /* not empty */
747 * Check to see if the directory described by target is in some
748 * subdirectory of source. This prevents something like the following from
749 * succeeding and leaving a bunch or files and directories orphaned. mv
750 * /a/b/c /a/b/c/d/e/f Where c and f are directories.
752 * source - the inode for /a/b/c
753 * target - the inode for /a/b/c/d/e/f
755 * Returns 0 if target is NOT a subdirectory of source.
756 * Otherwise returns a non-zero error number.
757 * The target inode is always unlocked on return.
760 doscheckpath(source, target)
761 struct denode *source;
762 struct denode *target;
765 struct msdosfsmount *pmp;
768 struct buf *bp = NULL;
772 if ((target->de_Attributes & ATTR_DIRECTORY) == 0 ||
773 (source->de_Attributes & ATTR_DIRECTORY) == 0) {
777 if (dep->de_StartCluster == source->de_StartCluster) {
781 if (dep->de_StartCluster == MSDOSFSROOT)
785 if (pmp != source->de_pmp)
786 panic("doscheckpath: source and target on different filesystems");
788 if (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)
792 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) {
796 scn = dep->de_StartCluster;
797 error = bread(pmp->pm_devvp, cntobn(pmp, scn),
798 pmp->pm_bpcluster, NOCRED, &bp);
802 ep = (struct direntry *) bp->b_data + 1;
803 if ((ep->deAttributes & ATTR_DIRECTORY) == 0 ||
804 bcmp(ep->deName, ".. ", 11) != 0) {
808 scn = getushort(ep->deStartCluster);
810 scn |= getushort(ep->deHighClust) << 16;
812 if (scn == source->de_StartCluster) {
816 if (scn == MSDOSFSROOT)
818 if (FAT32(pmp) && scn == pmp->pm_rootdirblk) {
820 * scn should be 0 in this case,
821 * but we silently ignore the error.
829 /* NOTE: deget() clears dep on error */
830 if ((error = deget(pmp, scn, 0, &dep)) != 0)
836 if (error == ENOTDIR)
837 printf("doscheckpath(): .. not a directory?\n");
844 * Read in the disk block containing the directory entry (dirclu, dirofs)
845 * and return the address of the buf header, and the address of the
846 * directory entry within the block.
849 readep(pmp, dirclust, diroffset, bpp, epp)
850 struct msdosfsmount *pmp;
851 u_long dirclust, diroffset;
853 struct direntry **epp;
859 blsize = pmp->pm_bpcluster;
860 if (dirclust == MSDOSFSROOT
861 && de_blk(pmp, diroffset + blsize) > pmp->pm_rootdirsize)
862 blsize = de_bn2off(pmp, pmp->pm_rootdirsize) & pmp->pm_crbomask;
863 bn = detobn(pmp, dirclust, diroffset);
864 if ((error = bread(pmp->pm_devvp, bn, blsize, NOCRED, bpp)) != 0) {
870 *epp = bptoep(pmp, *bpp, diroffset);
875 * Read in the disk block containing the directory entry dep came from and
876 * return the address of the buf header, and the address of the directory
877 * entry within the block.
880 readde(dep, bpp, epp)
883 struct direntry **epp;
886 return (readep(dep->de_pmp, dep->de_dirclust, dep->de_diroffset,
891 * Remove a directory entry. At this point the file represented by the
892 * directory entry to be removed is still full length until noone has it
893 * open. When the file no longer being used msdosfs_inactive() is called
894 * and will truncate the file to 0 length. When the vnode containing the
895 * denode is needed for some other purpose by VFS it will call
896 * msdosfs_reclaim() which will remove the denode from the denode cache.
900 struct denode *pdep; /* directory where the entry is removed */
901 struct denode *dep; /* file to be removed */
908 struct msdosfsmount *pmp = pdep->de_pmp;
909 u_long offset = pdep->de_fndoffset;
912 printf("removede(): filename %s, dep %p, offset %08lx\n",
913 dep->de_Name, dep, offset);
917 offset += sizeof(struct direntry);
919 offset -= sizeof(struct direntry);
920 error = pcbmap(pdep, de_cluster(pmp, offset), &bn, 0, &blsize);
923 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp);
928 ep = bptoep(pmp, bp, offset);
930 * Check whether, if we came here the second time, i.e.
931 * when underflowing into the previous block, the last
932 * entry in this block is a longfilename entry, too.
934 if (ep->deAttributes != ATTR_WIN95
935 && offset != pdep->de_fndoffset) {
939 offset += sizeof(struct direntry);
942 * We are a bit agressive here in that we delete any Win95
943 * entries preceding this entry, not just the ones we "own".
944 * Since these presumably aren't valid anyway,
945 * there should be no harm.
947 offset -= sizeof(struct direntry);
948 ep--->deName[0] = SLOT_DELETED;
949 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95)
950 || !(offset & pmp->pm_crbomask)
951 || ep->deAttributes != ATTR_WIN95)
954 if ((error = bwrite(bp)) != 0)
956 } while (!(pmp->pm_flags & MSDOSFSMNT_NOWIN95)
957 && !(offset & pmp->pm_crbomask)
963 * Create a unique DOS name in dvp
966 uniqdosname(dep, cnp, cp)
968 struct componentname *cnp;
971 struct msdosfsmount *pmp = dep->de_pmp;
972 struct direntry *dentp;
980 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
981 return (unix2dosfn((const u_char *)cnp->cn_nameptr, cp,
982 cnp->cn_namelen, 0, pmp) ? 0 : EINVAL);
984 for (gen = 1;; gen++) {
986 * Generate DOS name with generation number
988 if (!unix2dosfn((const u_char *)cnp->cn_nameptr, cp,
989 cnp->cn_namelen, gen, pmp))
990 return gen == 1 ? EINVAL : EEXIST;
993 * Now look for a dir entry with this exact name
995 for (cn = error = 0; !error; cn++) {
996 if ((error = pcbmap(dep, cn, &bn, 0, &blsize)) != 0) {
997 if (error == E2BIG) /* EOF reached and not found */
1001 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp);
1006 for (dentp = (struct direntry *)bp->b_data;
1007 (char *)dentp < bp->b_data + blsize;
1009 if (dentp->deName[0] == SLOT_EMPTY) {
1011 * Last used entry and not found
1017 * Ignore volume labels and Win95 entries
1019 if (dentp->deAttributes & ATTR_VOLUME)
1021 if (!bcmp(dentp->deName, cp, 11)) {
1032 * Find any Win'95 long filename entry in directory dep
1038 struct msdosfsmount *pmp = dep->de_pmp;
1039 struct direntry *dentp;
1047 * Read through the directory looking for Win'95 entries
1048 * Note: Error currently handled just as EOF XXX
1050 for (cn = 0;; cn++) {
1051 if (pcbmap(dep, cn, &bn, 0, &blsize))
1053 if (bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp)) {
1057 for (dentp = (struct direntry *)bp->b_data;
1058 (char *)dentp < bp->b_data + blsize;
1060 if (dentp->deName[0] == SLOT_EMPTY) {
1062 * Last used entry and not found
1067 if (dentp->deName[0] == SLOT_DELETED) {
1069 * Ignore deleted files
1070 * Note: might be an indication of Win'95 anyway XXX
1074 if (dentp->deAttributes == ATTR_WIN95) {