1 /* $FreeBSD: src/sys/msdosfs/msdosfs_lookup.c,v 1.30.2.1 2000/11/03 15:55:39 bp Exp $ */
2 /* $DragonFly: src/sys/vfs/msdosfs/msdosfs_lookup.c,v 1.21 2006/12/23 00:41:29 swildner Exp $ */
3 /* $NetBSD: msdosfs_lookup.c,v 1.37 1997/11/17 15:36:54 ws Exp $ */
6 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
7 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
9 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by TooLs GmbH.
22 * 4. The name of TooLs GmbH may not be used to endorse or promote products
23 * derived from this software without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 * Written by Paul Popelka (paulp@uts.amdahl.com)
39 * You can do anything you want with this software, just don't say you wrote
40 * it, and don't remove this notice.
42 * This software is provided "as is".
44 * The author supplies this software to be publicly redistributed on the
45 * understanding that the author is not responsible for the correct
46 * functioning of this software in any circumstances and is not liable for
47 * any damages caused by this software.
52 #include <sys/param.h>
53 #include <sys/systm.h>
55 #include <sys/vnode.h>
57 #include <sys/namei.h>
58 #include <sys/mount.h>
65 #include "msdosfsmount.h"
69 * When we search a directory the blocks containing directory entries are
70 * read and examined. The directory entries contain information that would
71 * normally be in the inode of a unix filesystem. This means that some of
72 * a directory's contents may also be in memory resident denodes (sort of
73 * an inode). This can cause problems if we are searching while some other
74 * process is modifying a directory. To prevent one process from accessing
75 * incompletely modified directory information we depend upon being the
76 * sole owner of a directory block. bread/brelse provide this service.
77 * This being the case, when a process modifies a directory it must first
78 * acquire the disk block that contains the directory entry to be modified.
79 * Then update the disk block and the denode, and then write the disk block
80 * out to disk. This way disk blocks containing directory entries and in
81 * memory denode's will be in synch.
83 * msdosfs_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
84 * struct componentname *a_cnp)
87 msdosfs_lookup(struct vop_old_lookup_args *ap)
90 struct vnode *vdp = ap->a_dvp;
91 struct vnode **vpp = ap->a_vpp;
92 struct componentname *cnp = ap->a_cnp;
104 int isadir; /* ~0 if found direntry is a directory */
105 u_long scn; /* starting cluster number */
109 struct msdosfsmount *pmp;
111 struct direntry *dep = NULL;
112 u_char dosfilename[12];
113 int flags = cnp->cn_flags;
114 int nameiop = cnp->cn_nameiop;
120 cnp->cn_flags &= ~CNP_PDIRUNLOCK;
123 kprintf("msdosfs_lookup(): looking for %s\n", cnp->cn_nameptr);
128 lockparent = flags & CNP_LOCKPARENT;
129 wantparent = flags & (CNP_LOCKPARENT | CNP_WANTPARENT);
131 kprintf("msdosfs_lookup(): vdp %p, dp %p, Attr %02x\n",
132 vdp, dp, dp->de_Attributes);
136 * If they are going after the . or .. entry in the root directory,
137 * they won't find it. DOS filesystems don't have them in the root
138 * directory. So, we fake it. deget() is in on this scam too.
140 if ((vdp->v_flag & VROOT) && cnp->cn_nameptr[0] == '.' &&
141 (cnp->cn_namelen == 1 ||
142 (cnp->cn_namelen == 2 && cnp->cn_nameptr[1] == '.'))) {
143 isadir = ATTR_DIRECTORY;
146 kprintf("msdosfs_lookup(): looking for . or .. in root directory\n");
148 cluster = MSDOSFSROOT;
149 blkoff = MSDOSFSROOT_OFS;
152 switch (unix2dosfn((const u_char *)cnp->cn_nameptr, dosfilename,
153 cnp->cn_namelen, 0, pmp)) {
159 wincnt = winSlotCnt((const u_char *)cnp->cn_nameptr,
160 cnp->cn_namelen, pmp) + 1;
164 wincnt = winSlotCnt((const u_char *)cnp->cn_nameptr,
165 cnp->cn_namelen, pmp) + 1;
168 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) {
172 unlen = winLenFixup(cnp->cn_nameptr, cnp->cn_namelen);
175 * Suppress search for slots unless creating
176 * file and at end of pathname, in which case
177 * we watch for a place to put the new file in
178 * case it doesn't already exist.
181 if (nameiop == NAMEI_CREATE || nameiop == NAMEI_RENAME)
185 kprintf("msdosfs_lookup(): dos version of filename %s, length %ld\n",
186 dosfilename, cnp->cn_namelen);
189 * Search the directory pointed at by vdp for the name pointed at
190 * by cnp->cn_nameptr.
195 * The outer loop ranges over the clusters that make up the
196 * directory. Note that the root directory is different from all
197 * other directories. It has a fixed number of blocks that are not
198 * part of the pool of allocatable clusters. So, we treat it a
199 * little differently. The root directory starts at "cluster" 0.
202 for (frcn = 0;; frcn++) {
203 error = pcbmap(dp, frcn, &bn, &cluster, &blsize);
209 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, &bp);
214 for (blkoff = 0; blkoff < blsize;
215 blkoff += sizeof(struct direntry),
216 diroff += sizeof(struct direntry)) {
217 dep = (struct direntry *)(bp->b_data + blkoff);
219 * If the slot is empty and we are still looking
220 * for an empty then remember this one. If the
221 * slot is not empty then check to see if it
222 * matches what we are looking for. If the slot
223 * has never been filled with anything, then the
224 * remainder of the directory has never been used,
225 * so there is no point in searching it.
227 if (dep->deName[0] == SLOT_EMPTY ||
228 dep->deName[0] == SLOT_DELETED) {
230 * Drop memory of previous long matches
235 if (slotcount < wincnt) {
239 if (dep->deName[0] == SLOT_EMPTY) {
245 * If there wasn't enough space for our winentries,
246 * forget about the empty space
248 if (slotcount < wincnt)
252 * Check for Win95 long filename entry
254 if (dep->deAttributes == ATTR_WIN95) {
255 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
257 chksum = win2unixfn(&nb,
258 (struct winentry *)dep, chksum,
263 chksum = winChkName(&nb,
264 (const u_char *)cnp->cn_nameptr, unlen,
272 * Ignore volume labels (anywhere, not just
273 * the root directory).
275 if (dep->deAttributes & ATTR_VOLUME) {
281 * Check for a checksum or name match
283 if (chksum != winChksum(dep->deName)
284 && (!olddos || bcmp(dosfilename, dep->deName, 11))) {
289 kprintf("msdosfs_lookup(): match blkoff %d, diroff %d\n",
293 * Remember where this directory
294 * entry came from for whoever did
297 dp->de_fndoffset = diroff;
298 dp->de_fndcnt = wincnt - 1;
302 } /* for (blkoff = 0; .... */
304 * Release the buffer holding the directory cluster just
308 } /* for (frcn = 0; ; frcn++) */
312 * We hold no disk buffers at this point.
316 * Fixup the slot description to point to the place where
317 * we might put the new DOS direntry (putting the Win95
318 * long name entries before that)
324 if (wincnt > slotcount)
325 slotoffset += sizeof(struct direntry) * (wincnt - slotcount);
328 * If we get here we didn't find the entry we were looking for. But
329 * that's ok if we are creating or renaming and are at the end of
330 * the pathname and the directory hasn't been removed.
333 kprintf("msdosfs_lookup(): op %d, refcnt %ld\n",
334 nameiop, dp->de_refcnt);
335 kprintf(" slotcount %d, slotoffset %d\n",
336 slotcount, slotoffset);
338 if ((nameiop == NAMEI_CREATE || nameiop == NAMEI_RENAME) &&
341 * Access for write is interpreted as allowing
342 * creation of files in the directory.
344 error = VOP_EACCESS(vdp, VWRITE, cnp->cn_cred);
348 * Return an indication of where the new directory
349 * entry should be put.
351 dp->de_fndoffset = slotoffset;
352 dp->de_fndcnt = wincnt - 1;
355 * We return with the directory locked, so that
356 * the parameters we set up above will still be
357 * valid if we actually decide to do a direnter().
358 * We return ni_vp == NULL to indicate that the entry
359 * does not currently exist; we leave a pointer to
360 * the (locked) directory inode in ndp->ni_dvp.
361 * The pathname buffer is saved so that the name
362 * can be obtained later.
364 * NB - if the directory is unlocked, then this
365 * information cannot be used.
369 cnp->cn_flags |= CNP_PDIRUNLOCK;
371 return (EJUSTRETURN);
377 * NOTE: We still have the buffer with matched directory entry at
380 isadir = dep->deAttributes & ATTR_DIRECTORY;
381 scn = getushort(dep->deStartCluster);
383 scn |= getushort(dep->deHighClust) << 16;
384 if (scn == pmp->pm_rootdirblk) {
386 * There should actually be 0 here.
387 * Just ignore the error.
395 if (cluster == MSDOSFSROOT)
396 blkoff = MSDOSFSROOT_OFS;
399 } else if (cluster == MSDOSFSROOT)
403 * Now release buf to allow deget to read the entry again.
404 * Reserving it here and giving it to deget could result
412 * If we entered at foundroot, then we are looking for the . or ..
413 * entry of the filesystems root directory. isadir and scn were
414 * setup before jumping here. And, bp is already null.
416 if (FAT32(pmp) && scn == MSDOSFSROOT)
417 scn = pmp->pm_rootdirblk;
420 * If deleting, and at end of pathname, return
421 * parameters which can be used to remove file.
422 * If the wantparent flag isn't set, we return only
423 * the directory (in ndp->ni_dvp), otherwise we go
424 * on and lock the inode, being careful with ".".
426 if (nameiop == NAMEI_DELETE) {
428 * Don't allow deleting the root.
430 if (blkoff == MSDOSFSROOT_OFS)
431 return EROFS; /* really? XXX */
434 * Write access to directory required to delete files.
436 error = VOP_EACCESS(vdp, VWRITE, cnp->cn_cred);
441 * Return pointer to current entry in dp->i_offset.
442 * Save directory inode pointer in ndp->ni_dvp for dirremove().
444 if (dp->de_StartCluster == scn && isadir) { /* "." */
449 error = deget(pmp, cluster, blkoff, &tdp);
455 cnp->cn_flags |= CNP_PDIRUNLOCK;
461 * If rewriting (RENAME), return the inode and the
462 * information required to rewrite the present directory
463 * Must get inode of directory entry to verify it's a
464 * regular file, or empty directory.
466 if (nameiop == NAMEI_RENAME && wantparent) {
467 if (blkoff == MSDOSFSROOT_OFS)
468 return EROFS; /* really? XXX */
470 error = VOP_EACCESS(vdp, VWRITE, cnp->cn_cred);
475 * Careful about locking second inode.
476 * This can only occur if the target is ".".
478 if (dp->de_StartCluster == scn && isadir)
481 if ((error = deget(pmp, cluster, blkoff, &tdp)) != 0)
486 cnp->cn_flags |= CNP_PDIRUNLOCK;
492 * Step through the translation in the name. We do not `vput' the
493 * directory because we may need it again if a symbolic link
494 * is relative to the current directory. Instead we save it
495 * unlocked as "pdp". We must get the target inode before unlocking
496 * the directory to insure that the inode will not be removed
497 * before we get it. We prevent deadlock by always fetching
498 * inodes from the root, moving down the directory tree. Thus
499 * when following backward pointers ".." we must unlock the
500 * parent directory before getting the requested directory.
501 * There is a potential race condition here if both the current
502 * and parent directories are removed before the VFS_VGET for the
503 * inode associated with ".." returns. We hope that this occurs
504 * infrequently since we cannot avoid this race condition without
505 * implementing a sophisticated deadlock detection algorithm.
506 * Note also that this simple deadlock detection scheme will not
507 * work if the file system has any hard links other than ".."
508 * that point backwards in the directory structure.
511 if (flags & CNP_ISDOTDOT) {
513 cnp->cn_flags |= CNP_PDIRUNLOCK;
514 error = deget(pmp, cluster, blkoff, &tdp);
516 vn_lock(pdp, LK_EXCLUSIVE | LK_RETRY);
517 cnp->cn_flags &= ~CNP_PDIRUNLOCK;
521 error = vn_lock(pdp, LK_EXCLUSIVE);
526 cnp->cn_flags &= ~CNP_PDIRUNLOCK;
529 } else if (dp->de_StartCluster == scn && isadir) {
530 vref(vdp); /* we want ourself, ie "." */
533 if ((error = deget(pmp, cluster, blkoff, &tdp)) != 0)
537 cnp->cn_flags |= CNP_PDIRUNLOCK;
545 * dep - directory entry to copy into the directory
546 * ddep - directory to add to
547 * depp - return the address of the denode for the created directory entry
549 * cnp - componentname needed for Win95 long filenames
552 createde(struct denode *dep, struct denode *ddep, struct denode **depp,
553 struct componentname *cnp)
556 u_long dirclust, diroffset;
557 struct direntry *ndep;
558 struct msdosfsmount *pmp = ddep->de_pmp;
564 kprintf("createde(dep %p, ddep %p, depp %p, cnp %p)\n",
565 dep, ddep, depp, cnp);
569 * If no space left in the directory then allocate another cluster
570 * and chain it onto the end of the file. There is one exception
571 * to this. That is, if the root directory has no more space it
572 * can NOT be expanded. extendfile() checks for and fails attempts
573 * to extend the root directory. We just return an error in that
576 if (ddep->de_fndoffset >= ddep->de_FileSize) {
577 diroffset = ddep->de_fndoffset + sizeof(struct direntry)
579 dirclust = de_clcount(pmp, diroffset);
580 error = extendfile(ddep, dirclust, 0, 0, DE_CLEAR);
582 detrunc(ddep, ddep->de_FileSize, 0);
587 * Update the size of the directory
589 ddep->de_FileSize += de_cn2off(pmp, dirclust);
593 * We just read in the cluster with space. Copy the new directory
594 * entry in. Then write it to disk. NOTE: DOS directories
595 * do not get smaller as clusters are emptied.
597 error = pcbmap(ddep, de_cluster(pmp, ddep->de_fndoffset),
598 &bn, &dirclust, &blsize);
601 diroffset = ddep->de_fndoffset;
602 if (dirclust != MSDOSFSROOT)
603 diroffset &= pmp->pm_crbomask;
604 if ((error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, &bp)) != 0) {
608 ndep = bptoep(pmp, bp, ddep->de_fndoffset);
610 DE_EXTERNALIZE(ndep, dep);
613 * Now write the Win95 long name
615 if (ddep->de_fndcnt > 0) {
616 u_int8_t chksum = winChksum(ndep->deName);
617 const u_char *un = (const u_char *)cnp->cn_nameptr;
618 int unlen = cnp->cn_namelen;
621 while (--ddep->de_fndcnt >= 0) {
622 if (!(ddep->de_fndoffset & pmp->pm_crbomask)) {
623 if ((error = bwrite(bp)) != 0)
626 ddep->de_fndoffset -= sizeof(struct direntry);
634 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, &bp);
639 ndep = bptoep(pmp, bp, ddep->de_fndoffset);
642 ddep->de_fndoffset -= sizeof(struct direntry);
644 if (!unix2winfn(un, unlen, (struct winentry *)ndep,
651 if ((error = bwrite(bp)) != 0)
655 * If they want us to return with the denode gotten.
658 if (dep->de_Attributes & ATTR_DIRECTORY) {
659 dirclust = dep->de_StartCluster;
660 if (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)
661 dirclust = MSDOSFSROOT;
662 if (dirclust == MSDOSFSROOT)
663 diroffset = MSDOSFSROOT_OFS;
667 return deget(pmp, dirclust, diroffset, depp);
674 * Be sure a directory is empty except for "." and "..". Return 1 if empty,
675 * return 0 if not empty or error.
678 dosdirempty(struct denode *dep)
685 struct msdosfsmount *pmp = dep->de_pmp;
686 struct direntry *dentp;
689 * Since the filesize field in directory entries for a directory is
690 * zero, we just have to feel our way through the directory until
691 * we hit end of file.
693 for (cn = 0;; cn++) {
694 if ((error = pcbmap(dep, cn, &bn, NULL, &blsize)) != 0) {
696 return (1); /* it's empty */
699 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, &bp);
704 for (dentp = (struct direntry *)bp->b_data;
705 (char *)dentp < bp->b_data + blsize;
707 if (dentp->deName[0] != SLOT_DELETED &&
708 (dentp->deAttributes & ATTR_VOLUME) == 0) {
710 * In dos directories an entry whose name
711 * starts with SLOT_EMPTY (0) starts the
712 * beginning of the unused part of the
713 * directory, so we can just return that it
716 if (dentp->deName[0] == SLOT_EMPTY) {
721 * Any names other than "." and ".." in a
722 * directory mean it is not empty.
724 if (bcmp(dentp->deName, ". ", 11) &&
725 bcmp(dentp->deName, ".. ", 11)) {
728 kprintf("dosdirempty(): entry found %02x, %02x\n",
729 dentp->deName[0], dentp->deName[1]);
731 return (0); /* not empty */
741 * Check to see if the directory described by target is in some
742 * subdirectory of source. This prevents something like the following from
743 * succeeding and leaving a bunch or files and directories orphaned. mv
744 * /a/b/c /a/b/c/d/e/f Where c and f are directories.
746 * source - the inode for /a/b/c
747 * target - the inode for /a/b/c/d/e/f
749 * Returns 0 if target is NOT a subdirectory of source.
750 * Otherwise returns a non-zero error number.
751 * The target inode is always unlocked on return.
754 doscheckpath(struct denode *source, struct denode *target)
757 struct msdosfsmount *pmp;
760 struct buf *bp = NULL;
764 if ((target->de_Attributes & ATTR_DIRECTORY) == 0 ||
765 (source->de_Attributes & ATTR_DIRECTORY) == 0) {
769 if (dep->de_StartCluster == source->de_StartCluster) {
773 if (dep->de_StartCluster == MSDOSFSROOT)
777 if (pmp != source->de_pmp)
778 panic("doscheckpath: source and target on different filesystems");
780 if (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)
784 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) {
788 scn = dep->de_StartCluster;
789 error = bread(pmp->pm_devvp, xcntodoff(pmp, scn),
790 pmp->pm_bpcluster, &bp);
794 ep = (struct direntry *) bp->b_data + 1;
795 if ((ep->deAttributes & ATTR_DIRECTORY) == 0 ||
796 bcmp(ep->deName, ".. ", 11) != 0) {
800 scn = getushort(ep->deStartCluster);
802 scn |= getushort(ep->deHighClust) << 16;
804 if (scn == source->de_StartCluster) {
808 if (scn == MSDOSFSROOT)
810 if (FAT32(pmp) && scn == pmp->pm_rootdirblk) {
812 * scn should be 0 in this case,
813 * but we silently ignore the error.
821 /* NOTE: deget() clears dep on error */
822 if ((error = deget(pmp, scn, 0, &dep)) != 0)
828 if (error == ENOTDIR)
829 kprintf("doscheckpath(): .. not a directory?\n");
836 * Read in the disk block containing the directory entry (dirclu, dirofs)
837 * and return the address of the buf header, and the address of the
838 * directory entry within the block.
841 readep(struct msdosfsmount *pmp, u_long dirclust, u_long diroffset,
842 struct buf **bpp, struct direntry **epp)
848 blsize = pmp->pm_bpcluster;
849 if (dirclust == MSDOSFSROOT
850 && de_blk(pmp, diroffset + blsize) > pmp->pm_rootdirsize)
851 blsize = de_bn2off(pmp, pmp->pm_rootdirsize) & pmp->pm_crbomask;
852 bn = detobn(pmp, dirclust, diroffset);
853 if ((error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, bpp)) != 0) {
859 *epp = bptoep(pmp, *bpp, diroffset);
864 * Read in the disk block containing the directory entry dep came from and
865 * return the address of the buf header, and the address of the directory
866 * entry within the block.
869 readde(struct denode *dep, struct buf **bpp, struct direntry **epp)
871 return (readep(dep->de_pmp, dep->de_dirclust, dep->de_diroffset,
876 * Remove a directory entry. At this point the file represented by the
877 * directory entry to be removed is still full length until noone has it
878 * open. When the file no longer being used msdosfs_inactive() is called
879 * and will truncate the file to 0 length. When the vnode containing the
880 * denode is needed for some other purpose by VFS it will call
881 * msdosfs_reclaim() which will remove the denode from the denode cache.
884 removede(struct denode *pdep, /* directory where the entry is removed */
885 struct denode *dep) /* file to be removed */
892 struct msdosfsmount *pmp = pdep->de_pmp;
893 u_long offset = pdep->de_fndoffset;
896 kprintf("removede(): filename %s, dep %p, offset %08lx\n",
897 dep->de_Name, dep, offset);
900 KKASSERT(dep->de_refcnt > 0);
902 offset += sizeof(struct direntry);
904 offset -= sizeof(struct direntry);
905 error = pcbmap(pdep, de_cluster(pmp, offset),
909 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, &bp);
914 ep = bptoep(pmp, bp, offset);
916 * Check whether, if we came here the second time, i.e.
917 * when underflowing into the previous block, the last
918 * entry in this block is a longfilename entry, too.
920 if (ep->deAttributes != ATTR_WIN95
921 && offset != pdep->de_fndoffset) {
925 offset += sizeof(struct direntry);
928 * We are a bit agressive here in that we delete any Win95
929 * entries preceding this entry, not just the ones we "own".
930 * Since these presumably aren't valid anyway,
931 * there should be no harm.
933 offset -= sizeof(struct direntry);
934 ep--->deName[0] = SLOT_DELETED;
935 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95)
936 || !(offset & pmp->pm_crbomask)
937 || ep->deAttributes != ATTR_WIN95)
940 if ((error = bwrite(bp)) != 0)
942 } while (!(pmp->pm_flags & MSDOSFSMNT_NOWIN95)
943 && !(offset & pmp->pm_crbomask)
949 * Create a unique DOS name in dvp
952 uniqdosname(struct denode *dep, struct componentname *cnp, u_char *cp)
954 struct msdosfsmount *pmp = dep->de_pmp;
955 struct direntry *dentp;
963 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
964 return (unix2dosfn((const u_char *)cnp->cn_nameptr, cp,
965 cnp->cn_namelen, 0, pmp) ?
968 for (gen = 1;; gen++) {
970 * Generate DOS name with generation number
972 if (!unix2dosfn((const u_char *)cnp->cn_nameptr, cp,
973 cnp->cn_namelen, gen, pmp))
974 return gen == 1 ? EINVAL : EEXIST;
977 * Now look for a dir entry with this exact name
979 for (cn = error = 0; !error; cn++) {
980 if ((error = pcbmap(dep, cn, &bn, 0, &blsize)) != 0) {
981 if (error == E2BIG) /* EOF reached and not found */
985 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, &bp);
990 for (dentp = (struct direntry *)bp->b_data;
991 (char *)dentp < bp->b_data + blsize;
993 if (dentp->deName[0] == SLOT_EMPTY) {
995 * Last used entry and not found
1001 * Ignore volume labels and Win95 entries
1003 if (dentp->deAttributes & ATTR_VOLUME)
1005 if (!bcmp(dentp->deName, cp, 11)) {
1016 * Find any Win'95 long filename entry in directory dep
1019 findwin95(struct denode *dep)
1021 struct msdosfsmount *pmp = dep->de_pmp;
1022 struct direntry *dentp;
1030 * Read through the directory looking for Win'95 entries
1031 * Note: Error currently handled just as EOF XXX
1033 for (cn = 0;; cn++) {
1034 if (pcbmap(dep, cn, &bn, 0, &blsize))
1036 if (bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, &bp)) {
1040 for (dentp = (struct direntry *)bp->b_data;
1041 (char *)dentp < bp->b_data + blsize;
1043 if (dentp->deName[0] == SLOT_EMPTY) {
1045 * Last used entry and not found
1050 if (dentp->deName[0] == SLOT_DELETED) {
1052 * Ignore deleted files
1053 * Note: might be an indication of Win'95 anyway XXX
1057 if (dentp->deAttributes == ATTR_WIN95) {