1 /* $FreeBSD: src/sys/msdosfs/msdosfs_lookup.c,v 1.30.2.1 2000/11/03 15:55:39 bp Exp $ */
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/vnode.h>
56 #include <sys/namei.h>
57 #include <sys/mount.h>
64 #include "msdosfsmount.h"
68 * When we search a directory the blocks containing directory entries are
69 * read and examined. The directory entries contain information that would
70 * normally be in the inode of a unix filesystem. This means that some of
71 * a directory's contents may also be in memory resident denodes (sort of
72 * an inode). This can cause problems if we are searching while some other
73 * process is modifying a directory. To prevent one process from accessing
74 * incompletely modified directory information we depend upon being the
75 * sole owner of a directory block. bread/brelse provide this service.
76 * This being the case, when a process modifies a directory it must first
77 * acquire the disk block that contains the directory entry to be modified.
78 * Then update the disk block and the denode, and then write the disk block
79 * out to disk. This way disk blocks containing directory entries and in
80 * memory denode's will be in synch.
82 * msdosfs_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
83 * struct componentname *a_cnp)
86 msdosfs_lookup(struct vop_old_lookup_args *ap)
89 struct vnode *vdp = ap->a_dvp;
90 struct vnode **vpp = ap->a_vpp;
91 struct componentname *cnp = ap->a_cnp;
103 int isadir; /* ~0 if found direntry is a directory */
104 u_long scn; /* starting cluster number */
108 struct msdosfsmount *pmp;
109 struct buf *bp = NULL;
110 struct direntry *dep = NULL;
111 u_char dosfilename[12];
112 int flags = cnp->cn_flags;
113 int nameiop = cnp->cn_nameiop;
119 cnp->cn_flags &= ~CNP_PDIRUNLOCK;
122 kprintf("msdosfs_lookup(): looking for %s\n", cnp->cn_nameptr);
127 lockparent = flags & CNP_LOCKPARENT;
128 wantparent = flags & (CNP_LOCKPARENT | CNP_WANTPARENT);
130 kprintf("msdosfs_lookup(): vdp %p, dp %p, Attr %02x\n",
131 vdp, dp, dp->de_Attributes);
135 * If they are going after the . or .. entry in the root directory,
136 * they won't find it. DOS filesystems don't have them in the root
137 * directory. So, we fake it. deget() is in on this scam too.
139 if ((vdp->v_flag & VROOT) && cnp->cn_nameptr[0] == '.' &&
140 (cnp->cn_namelen == 1 ||
141 (cnp->cn_namelen == 2 && cnp->cn_nameptr[1] == '.'))) {
142 isadir = ATTR_DIRECTORY;
145 kprintf("msdosfs_lookup(): looking for . or .. in root directory\n");
147 cluster = MSDOSFSROOT;
148 blkoff = MSDOSFSROOT_OFS;
151 switch (unix2dosfn((const u_char *)cnp->cn_nameptr, dosfilename,
152 cnp->cn_namelen, 0, pmp)) {
158 wincnt = winSlotCnt((const u_char *)cnp->cn_nameptr,
159 cnp->cn_namelen, pmp) + 1;
163 wincnt = winSlotCnt((const u_char *)cnp->cn_nameptr,
164 cnp->cn_namelen, pmp) + 1;
167 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) {
171 unlen = winLenFixup(cnp->cn_nameptr, cnp->cn_namelen);
174 * Suppress search for slots unless creating
175 * file and at end of pathname, in which case
176 * we watch for a place to put the new file in
177 * case it doesn't already exist.
180 if (nameiop == NAMEI_CREATE || nameiop == NAMEI_RENAME)
184 kprintf("msdosfs_lookup(): dos version of filename %s, length %ld\n",
185 dosfilename, cnp->cn_namelen);
188 * Search the directory pointed at by vdp for the name pointed at
189 * by cnp->cn_nameptr.
194 * The outer loop ranges over the clusters that make up the
195 * directory. Note that the root directory is different from all
196 * other directories. It has a fixed number of blocks that are not
197 * part of the pool of allocatable clusters. So, we treat it a
198 * little differently. The root directory starts at "cluster" 0.
201 for (frcn = 0;; frcn++) {
202 error = pcbmap(dp, frcn, &bn, &cluster, &blsize);
208 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, &bp);
213 for (blkoff = 0; blkoff < blsize;
214 blkoff += sizeof(struct direntry),
215 diroff += sizeof(struct direntry)) {
216 dep = (struct direntry *)(bp->b_data + blkoff);
218 * If the slot is empty and we are still looking
219 * for an empty then remember this one. If the
220 * slot is not empty then check to see if it
221 * matches what we are looking for. If the slot
222 * has never been filled with anything, then the
223 * remainder of the directory has never been used,
224 * so there is no point in searching it.
226 if (dep->deName[0] == SLOT_EMPTY ||
227 dep->deName[0] == SLOT_DELETED) {
229 * Drop memory of previous long matches
234 if (slotcount < wincnt) {
238 if (dep->deName[0] == SLOT_EMPTY) {
244 * If there wasn't enough space for our winentries,
245 * forget about the empty space
247 if (slotcount < wincnt)
251 * Check for Win95 long filename entry
253 if (dep->deAttributes == ATTR_WIN95) {
254 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
256 chksum = win2unixfn(&nb,
257 (struct winentry *)dep, chksum,
262 chksum = winChkName(&nb,
263 (const u_char *)cnp->cn_nameptr, unlen,
271 * Ignore volume labels (anywhere, not just
272 * the root directory).
274 if (dep->deAttributes & ATTR_VOLUME) {
280 * Check for a checksum or name match
282 if (chksum != winChksum(dep->deName)
283 && (!olddos || bcmp(dosfilename, dep->deName, 11))) {
288 kprintf("msdosfs_lookup(): match blkoff %d, diroff %d\n",
292 * Remember where this directory
293 * entry came from for whoever did
296 dp->de_fndoffset = diroff;
297 dp->de_fndcnt = wincnt - 1;
301 } /* for (blkoff = 0; .... */
303 * Release the buffer holding the directory cluster just
307 } /* for (frcn = 0; ; frcn++) */
311 * We hold no disk buffers at this point.
315 * Fixup the slot description to point to the place where
316 * we might put the new DOS direntry (putting the Win95
317 * long name entries before that)
323 if (wincnt > slotcount)
324 slotoffset += sizeof(struct direntry) * (wincnt - slotcount);
327 * If we get here we didn't find the entry we were looking for. But
328 * that's ok if we are creating or renaming and are at the end of
329 * the pathname and the directory hasn't been removed.
332 kprintf("msdosfs_lookup(): op %d, refcnt %ld\n",
333 nameiop, dp->de_refcnt);
334 kprintf(" slotcount %d, slotoffset %d\n",
335 slotcount, slotoffset);
337 if ((nameiop == NAMEI_CREATE || nameiop == NAMEI_RENAME) &&
340 * Access for write is interpreted as allowing
341 * creation of files in the directory.
343 error = VOP_EACCESS(vdp, VWRITE, cnp->cn_cred);
347 * Return an indication of where the new directory
348 * entry should be put.
350 dp->de_fndoffset = slotoffset;
351 dp->de_fndcnt = wincnt - 1;
354 * We return with the directory locked, so that
355 * the parameters we set up above will still be
356 * valid if we actually decide to do a direnter().
357 * We return ni_vp == NULL to indicate that the entry
358 * does not currently exist; we leave a pointer to
359 * the (locked) directory inode in ndp->ni_dvp.
360 * The pathname buffer is saved so that the name
361 * can be obtained later.
363 * NB - if the directory is unlocked, then this
364 * information cannot be used.
368 cnp->cn_flags |= CNP_PDIRUNLOCK;
370 return (EJUSTRETURN);
376 * NOTE: We still have the buffer with matched directory entry at
379 isadir = dep->deAttributes & ATTR_DIRECTORY;
380 scn = getushort(dep->deStartCluster);
382 scn |= getushort(dep->deHighClust) << 16;
383 if (scn == pmp->pm_rootdirblk) {
385 * There should actually be 0 here.
386 * Just ignore the error.
394 if (cluster == MSDOSFSROOT)
395 blkoff = MSDOSFSROOT_OFS;
398 } else if (cluster == MSDOSFSROOT)
402 * Now release buf to allow deget to read the entry again.
403 * Reserving it here and giving it to deget could result
411 * If we entered at foundroot, then we are looking for the . or ..
412 * entry of the filesystems root directory. isadir and scn were
413 * setup before jumping here. And, bp is already null.
415 if (FAT32(pmp) && scn == MSDOSFSROOT)
416 scn = pmp->pm_rootdirblk;
419 * If deleting, and at end of pathname, return
420 * parameters which can be used to remove file.
421 * If the wantparent flag isn't set, we return only
422 * the directory (in ndp->ni_dvp), otherwise we go
423 * on and lock the inode, being careful with ".".
425 if (nameiop == NAMEI_DELETE) {
427 * Don't allow deleting the root.
429 if (blkoff == MSDOSFSROOT_OFS)
430 return EROFS; /* really? XXX */
433 * Write access to directory required to delete files.
435 error = VOP_EACCESS(vdp, VWRITE, cnp->cn_cred);
440 * Return pointer to current entry in dp->i_offset.
441 * Save directory inode pointer in ndp->ni_dvp for dirremove().
443 if (dp->de_StartCluster == scn && isadir) { /* "." */
448 error = deget(pmp, cluster, blkoff, &tdp);
454 cnp->cn_flags |= CNP_PDIRUNLOCK;
460 * If rewriting (RENAME), return the inode and the
461 * information required to rewrite the present directory
462 * Must get inode of directory entry to verify it's a
463 * regular file, or empty directory.
465 if (nameiop == NAMEI_RENAME && wantparent) {
466 if (blkoff == MSDOSFSROOT_OFS)
467 return EROFS; /* really? XXX */
469 error = VOP_EACCESS(vdp, VWRITE, cnp->cn_cred);
474 * Careful about locking second inode.
475 * This can only occur if the target is ".".
477 if (dp->de_StartCluster == scn && isadir)
480 if ((error = deget(pmp, cluster, blkoff, &tdp)) != 0)
485 cnp->cn_flags |= CNP_PDIRUNLOCK;
491 * Step through the translation in the name. We do not `vput' the
492 * directory because we may need it again if a symbolic link
493 * is relative to the current directory. Instead we save it
494 * unlocked as "pdp". We must get the target inode before unlocking
495 * the directory to insure that the inode will not be removed
496 * before we get it. We prevent deadlock by always fetching
497 * inodes from the root, moving down the directory tree. Thus
498 * when following backward pointers ".." we must unlock the
499 * parent directory before getting the requested directory.
500 * There is a potential race condition here if both the current
501 * and parent directories are removed before the VFS_VGET for the
502 * inode associated with ".." returns. We hope that this occurs
503 * infrequently since we cannot avoid this race condition without
504 * implementing a sophisticated deadlock detection algorithm.
505 * Note also that this simple deadlock detection scheme will not
506 * work if the file system has any hard links other than ".."
507 * that point backwards in the directory structure.
510 if (flags & CNP_ISDOTDOT) {
512 cnp->cn_flags |= CNP_PDIRUNLOCK;
513 error = deget(pmp, cluster, blkoff, &tdp);
515 vn_lock(pdp, LK_EXCLUSIVE | LK_RETRY);
516 cnp->cn_flags &= ~CNP_PDIRUNLOCK;
520 error = vn_lock(pdp, LK_EXCLUSIVE | LK_FAILRECLAIM);
525 cnp->cn_flags &= ~CNP_PDIRUNLOCK;
528 } else if (dp->de_StartCluster == scn && isadir) {
529 vref(vdp); /* we want ourself, ie "." */
532 if ((error = deget(pmp, cluster, blkoff, &tdp)) != 0)
536 cnp->cn_flags |= CNP_PDIRUNLOCK;
544 * dep - directory entry to copy into the directory
545 * ddep - directory to add to
546 * depp - return the address of the denode for the created directory entry
548 * cnp - componentname needed for Win95 long filenames
551 createde(struct denode *dep, struct denode *ddep, struct denode **depp,
552 struct componentname *cnp)
555 u_long dirclust, diroffset;
556 struct direntry *ndep;
557 struct msdosfsmount *pmp = ddep->de_pmp;
563 kprintf("createde(dep %p, ddep %p, depp %p, cnp %p)\n",
564 dep, ddep, depp, cnp);
568 * If no space left in the directory then allocate another cluster
569 * and chain it onto the end of the file. There is one exception
570 * to this. That is, if the root directory has no more space it
571 * can NOT be expanded. extendfile() checks for and fails attempts
572 * to extend the root directory. We just return an error in that
575 if (ddep->de_fndoffset >= ddep->de_FileSize) {
576 diroffset = ddep->de_fndoffset + sizeof(struct direntry)
578 dirclust = de_clcount(pmp, diroffset);
579 error = extendfile(ddep, dirclust, 0, 0, DE_CLEAR);
581 detrunc(ddep, ddep->de_FileSize, 0);
586 * Update the size of the directory
588 ddep->de_FileSize += de_cn2off(pmp, dirclust);
592 * We just read in the cluster with space. Copy the new directory
593 * entry in. Then write it to disk. NOTE: DOS directories
594 * do not get smaller as clusters are emptied.
596 error = pcbmap(ddep, de_cluster(pmp, ddep->de_fndoffset),
597 &bn, &dirclust, &blsize);
600 diroffset = ddep->de_fndoffset;
601 if (dirclust != MSDOSFSROOT)
602 diroffset &= pmp->pm_crbomask;
603 if ((error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, &bp)) != 0) {
607 ndep = bptoep(pmp, bp, ddep->de_fndoffset);
609 DE_EXTERNALIZE(ndep, dep);
612 * Now write the Win95 long name
614 if (ddep->de_fndcnt > 0) {
615 u_int8_t chksum = winChksum(ndep->deName);
616 const u_char *un = (const u_char *)cnp->cn_nameptr;
617 int unlen = cnp->cn_namelen;
620 while (--ddep->de_fndcnt >= 0) {
621 if (!(ddep->de_fndoffset & pmp->pm_crbomask)) {
622 if ((error = bwrite(bp)) != 0)
625 ddep->de_fndoffset -= sizeof(struct direntry);
633 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, &bp);
638 ndep = bptoep(pmp, bp, ddep->de_fndoffset);
641 ddep->de_fndoffset -= sizeof(struct direntry);
643 if (!unix2winfn(un, unlen, (struct winentry *)ndep,
650 if ((error = bwrite(bp)) != 0)
654 * If they want us to return with the denode gotten.
657 if (dep->de_Attributes & ATTR_DIRECTORY) {
658 dirclust = dep->de_StartCluster;
659 if (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)
660 dirclust = MSDOSFSROOT;
661 if (dirclust == MSDOSFSROOT)
662 diroffset = MSDOSFSROOT_OFS;
666 return deget(pmp, dirclust, diroffset, depp);
673 * Be sure a directory is empty except for "." and "..". Return 1 if empty,
674 * return 0 if not empty or error.
677 dosdirempty(struct denode *dep)
684 struct msdosfsmount *pmp = dep->de_pmp;
685 struct direntry *dentp;
688 * Since the filesize field in directory entries for a directory is
689 * zero, we just have to feel our way through the directory until
690 * we hit end of file.
692 for (cn = 0;; cn++) {
693 if ((error = pcbmap(dep, cn, &bn, NULL, &blsize)) != 0) {
695 return (1); /* it's empty */
698 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, &bp);
703 for (dentp = (struct direntry *)bp->b_data;
704 (char *)dentp < bp->b_data + blsize;
706 if (dentp->deName[0] != SLOT_DELETED &&
707 (dentp->deAttributes & ATTR_VOLUME) == 0) {
709 * In dos directories an entry whose name
710 * starts with SLOT_EMPTY (0) starts the
711 * beginning of the unused part of the
712 * directory, so we can just return that it
715 if (dentp->deName[0] == SLOT_EMPTY) {
720 * Any names other than "." and ".." in a
721 * directory mean it is not empty.
723 if (bcmp(dentp->deName, ". ", 11) &&
724 bcmp(dentp->deName, ".. ", 11)) {
727 kprintf("dosdirempty(): entry found %02x, %02x\n",
728 dentp->deName[0], dentp->deName[1]);
730 return (0); /* not empty */
740 * Check to see if the directory described by target is in some
741 * subdirectory of source. This prevents something like the following from
742 * succeeding and leaving a bunch or files and directories orphaned. mv
743 * /a/b/c /a/b/c/d/e/f Where c and f are directories.
745 * source - the inode for /a/b/c
746 * target - the inode for /a/b/c/d/e/f
748 * Returns 0 if target is NOT a subdirectory of source.
749 * Otherwise returns a non-zero error number.
750 * The target inode is always unlocked on return.
753 doscheckpath(struct denode *source, struct denode *target)
756 struct msdosfsmount *pmp;
759 struct buf *bp = NULL;
763 if ((target->de_Attributes & ATTR_DIRECTORY) == 0 ||
764 (source->de_Attributes & ATTR_DIRECTORY) == 0) {
768 if (dep->de_StartCluster == source->de_StartCluster) {
772 if (dep->de_StartCluster == MSDOSFSROOT)
776 if (pmp != source->de_pmp)
777 panic("doscheckpath: source and target on different filesystems");
779 if (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)
783 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) {
787 scn = dep->de_StartCluster;
788 error = bread(pmp->pm_devvp, xcntodoff(pmp, scn),
789 pmp->pm_bpcluster, &bp);
793 ep = (struct direntry *) bp->b_data + 1;
794 if ((ep->deAttributes & ATTR_DIRECTORY) == 0 ||
795 bcmp(ep->deName, ".. ", 11) != 0) {
799 scn = getushort(ep->deStartCluster);
801 scn |= getushort(ep->deHighClust) << 16;
803 if (scn == source->de_StartCluster) {
807 if (scn == MSDOSFSROOT)
809 if (FAT32(pmp) && scn == pmp->pm_rootdirblk) {
811 * scn should be 0 in this case,
812 * but we silently ignore the error.
820 /* NOTE: deget() clears dep on error */
821 if ((error = deget(pmp, scn, 0, &dep)) != 0)
827 if (error == ENOTDIR)
828 kprintf("doscheckpath(): .. not a directory?\n");
835 * Read in the disk block containing the directory entry (dirclu, dirofs)
836 * and return the address of the buf header, and the address of the
837 * directory entry within the block.
840 readep(struct msdosfsmount *pmp, u_long dirclust, u_long diroffset,
841 struct buf **bpp, struct direntry **epp)
847 blsize = pmp->pm_bpcluster;
848 if (dirclust == MSDOSFSROOT
849 && de_blk(pmp, diroffset + blsize) > pmp->pm_rootdirsize)
850 blsize = de_bn2off(pmp, pmp->pm_rootdirsize) & pmp->pm_crbomask;
851 bn = detobn(pmp, dirclust, diroffset);
852 if ((error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, bpp)) != 0) {
858 *epp = bptoep(pmp, *bpp, diroffset);
863 * Read in the disk block containing the directory entry dep came from and
864 * return the address of the buf header, and the address of the directory
865 * entry within the block.
868 readde(struct denode *dep, struct buf **bpp, struct direntry **epp)
870 return (readep(dep->de_pmp, dep->de_dirclust, dep->de_diroffset,
875 * Remove a directory entry. At this point the file represented by the
876 * directory entry to be removed is still full length until noone has it
877 * open. When the file no longer being used msdosfs_inactive() is called
878 * and will truncate the file to 0 length. When the vnode containing the
879 * denode is needed for some other purpose by VFS it will call
880 * msdosfs_reclaim() which will remove the denode from the denode cache.
883 removede(struct denode *pdep, /* directory where the entry is removed */
884 struct denode *dep) /* file to be removed */
891 struct msdosfsmount *pmp = pdep->de_pmp;
892 u_long offset = pdep->de_fndoffset;
895 kprintf("removede(): filename %s, dep %p, offset %08lx\n",
896 dep->de_Name, dep, offset);
899 KKASSERT(dep->de_refcnt > 0);
901 offset += sizeof(struct direntry);
903 offset -= sizeof(struct direntry);
904 error = pcbmap(pdep, de_cluster(pmp, offset),
908 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, &bp);
913 ep = bptoep(pmp, bp, offset);
915 * Check whether, if we came here the second time, i.e.
916 * when underflowing into the previous block, the last
917 * entry in this block is a longfilename entry, too.
919 if (ep->deAttributes != ATTR_WIN95
920 && offset != pdep->de_fndoffset) {
924 offset += sizeof(struct direntry);
927 * We are a bit agressive here in that we delete any Win95
928 * entries preceding this entry, not just the ones we "own".
929 * Since these presumably aren't valid anyway,
930 * there should be no harm.
932 offset -= sizeof(struct direntry);
933 ep--->deName[0] = SLOT_DELETED;
934 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95)
935 || !(offset & pmp->pm_crbomask)
936 || ep->deAttributes != ATTR_WIN95)
939 if ((error = bwrite(bp)) != 0)
941 } while (!(pmp->pm_flags & MSDOSFSMNT_NOWIN95)
942 && !(offset & pmp->pm_crbomask)
948 * Create a unique DOS name in dvp
951 uniqdosname(struct denode *dep, struct componentname *cnp, u_char *cp)
953 struct msdosfsmount *pmp = dep->de_pmp;
954 struct direntry *dentp;
962 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
963 return (unix2dosfn((const u_char *)cnp->cn_nameptr, cp,
964 cnp->cn_namelen, 0, pmp) ?
967 for (gen = 1;; gen++) {
969 * Generate DOS name with generation number
971 if (!unix2dosfn((const u_char *)cnp->cn_nameptr, cp,
972 cnp->cn_namelen, gen, pmp))
973 return gen == 1 ? EINVAL : EEXIST;
976 * Now look for a dir entry with this exact name
978 for (cn = error = 0; !error; cn++) {
979 if ((error = pcbmap(dep, cn, &bn, 0, &blsize)) != 0) {
980 if (error == E2BIG) /* EOF reached and not found */
984 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, &bp);
989 for (dentp = (struct direntry *)bp->b_data;
990 (char *)dentp < bp->b_data + blsize;
992 if (dentp->deName[0] == SLOT_EMPTY) {
994 * Last used entry and not found
1000 * Ignore volume labels and Win95 entries
1002 if (dentp->deAttributes & ATTR_VOLUME)
1004 if (!bcmp(dentp->deName, cp, 11)) {
1015 * Find any Win'95 long filename entry in directory dep
1018 findwin95(struct denode *dep)
1020 struct msdosfsmount *pmp = dep->de_pmp;
1021 struct direntry *dentp;
1029 * Read through the directory looking for Win'95 entries
1030 * Note: Error currently handled just as EOF XXX
1032 for (cn = 0;; cn++) {
1033 if (pcbmap(dep, cn, &bn, 0, &blsize))
1035 if (bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, &bp)) {
1039 for (dentp = (struct direntry *)bp->b_data;
1040 (char *)dentp < bp->b_data + blsize;
1042 if (dentp->deName[0] == SLOT_EMPTY) {
1044 * Last used entry and not found
1049 if (dentp->deName[0] == SLOT_DELETED) {
1051 * Ignore deleted files
1052 * Note: might be an indication of Win'95 anyway XXX
1056 if (dentp->deAttributes == ATTR_WIN95) {