2 /* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg 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>
55 #include <sys/clock.h>
56 #include <sys/dirent.h>
58 #include <sys/lockf.h>
59 #include <sys/malloc.h>
60 #include <sys/mount.h>
61 #include <sys/mutex.h>
62 #include <sys/namei.h>
65 #include <sys/unistd.h>
66 #include <sys/vnode.h>
69 #include <vm/vm_extern.h>
71 #include <fs/msdosfs/bpb.h>
72 #include <fs/msdosfs/direntry.h>
73 #include <fs/msdosfs/denode.h>
74 #include <fs/msdosfs/fat.h>
75 #include <fs/msdosfs/msdosfsmount.h>
77 #define DOS_FILESIZE_MAX 0xffffffff
80 * Prototypes for MSDOSFS vnode operations
82 static vop_create_t msdosfs_create;
83 static vop_mknod_t msdosfs_mknod;
84 static vop_open_t msdosfs_open;
85 static vop_close_t msdosfs_close;
86 static vop_access_t msdosfs_access;
87 static vop_getattr_t msdosfs_getattr;
88 static vop_setattr_t msdosfs_setattr;
89 static vop_read_t msdosfs_read;
90 static vop_write_t msdosfs_write;
91 static vop_fsync_t msdosfs_fsync;
92 static vop_remove_t msdosfs_remove;
93 static vop_link_t msdosfs_link;
94 static vop_rename_t msdosfs_rename;
95 static vop_mkdir_t msdosfs_mkdir;
96 static vop_rmdir_t msdosfs_rmdir;
97 static vop_symlink_t msdosfs_symlink;
98 static vop_readdir_t msdosfs_readdir;
99 static vop_bmap_t msdosfs_bmap;
100 static vop_strategy_t msdosfs_strategy;
101 static vop_print_t msdosfs_print;
102 static vop_pathconf_t msdosfs_pathconf;
103 static vop_vptofh_t msdosfs_vptofh;
106 * Some general notes:
108 * In the ufs filesystem the inodes, superblocks, and indirect blocks are
109 * read/written using the vnode for the filesystem. Blocks that represent
110 * the contents of a file are read/written using the vnode for the file
111 * (including directories when they are read/written as files). This
112 * presents problems for the dos filesystem because data that should be in
113 * an inode (if dos had them) resides in the directory itself. Since we
114 * must update directory entries without the benefit of having the vnode
115 * for the directory we must use the vnode for the filesystem. This means
116 * that when a directory is actually read/written (via read, write, or
117 * readdir, or seek) we must use the vnode for the filesystem instead of
118 * the vnode for the directory as would happen in ufs. This is to insure we
119 * retreive the correct block from the buffer cache since the hash value is
120 * based upon the vnode address and the desired block number.
124 * Create a regular file. On entry the directory to contain the file being
125 * created is locked. We must release before we return. We must also free
126 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or
127 * only if the SAVESTART bit in cn_flags is clear on success.
130 msdosfs_create(struct vop_create_args *ap)
132 struct componentname *cnp = ap->a_cnp;
133 struct denode ndirent;
135 struct denode *pdep = VTODE(ap->a_dvp);
140 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap);
144 * If this is the root directory and there is no space left we
145 * can't do anything. This is because the root directory can not
148 if (pdep->de_StartCluster == MSDOSFSROOT
149 && pdep->de_fndoffset >= pdep->de_FileSize) {
155 * Create a directory entry for the file, then call createde() to
156 * have it installed. NOTE: DOS files are always executable. We
157 * use the absence of the owner write bit to make the file
161 if ((cnp->cn_flags & HASBUF) == 0)
162 panic("msdosfs_create: no name");
164 bzero(&ndirent, sizeof(ndirent));
165 error = uniqdosname(pdep, cnp, ndirent.de_Name);
169 ndirent.de_Attributes = ATTR_ARCHIVE;
170 ndirent.de_LowerCase = 0;
171 ndirent.de_StartCluster = 0;
172 ndirent.de_FileSize = 0;
173 ndirent.de_pmp = pdep->de_pmp;
174 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
176 DETIMES(&ndirent, &ts, &ts, &ts);
177 error = createde(&ndirent, pdep, &dep, cnp);
180 *ap->a_vpp = DETOV(dep);
181 if ((cnp->cn_flags & MAKEENTRY) != 0)
182 cache_enter(ap->a_dvp, *ap->a_vpp, cnp);
190 msdosfs_mknod(struct vop_mknod_args *ap)
197 msdosfs_open(struct vop_open_args *ap)
199 struct denode *dep = VTODE(ap->a_vp);
200 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td);
205 msdosfs_close(struct vop_close_args *ap)
207 struct vnode *vp = ap->a_vp;
208 struct denode *dep = VTODE(vp);
212 if (vp->v_usecount > 1) {
214 DETIMES(dep, &ts, &ts, &ts);
221 msdosfs_access(struct vop_access_args *ap)
223 struct vnode *vp = ap->a_vp;
224 struct denode *dep = VTODE(ap->a_vp);
225 struct msdosfsmount *pmp = dep->de_pmp;
227 accmode_t accmode = ap->a_accmode;
229 file_mode = S_IRWXU|S_IRWXG|S_IRWXO;
230 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
233 * Disallow writing to directories and regular files if the
234 * filesystem is read-only.
236 if (accmode & VWRITE) {
237 switch (vp->v_type) {
240 if (vp->v_mount->mnt_flag & MNT_RDONLY)
248 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid,
249 ap->a_accmode, ap->a_cred, NULL));
253 msdosfs_getattr(struct vop_getattr_args *ap)
255 struct denode *dep = VTODE(ap->a_vp);
256 struct msdosfsmount *pmp = dep->de_pmp;
257 struct vattr *vap = ap->a_vap;
260 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
264 DETIMES(dep, &ts, &ts, &ts);
265 vap->va_fsid = dev2udev(pmp->pm_dev);
267 * The following computation of the fileid must be the same as that
268 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
271 if (dep->de_Attributes & ATTR_DIRECTORY) {
272 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) *
274 if (dep->de_StartCluster == MSDOSFSROOT)
277 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) *
279 if (dep->de_dirclust == MSDOSFSROOT)
280 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk;
281 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry);
284 if (pmp->pm_flags & MSDOSFS_LARGEFS)
285 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid);
287 vap->va_fileid = (long)fileid;
289 mode = S_IRWXU|S_IRWXG|S_IRWXO;
290 vap->va_mode = mode &
291 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
292 vap->va_uid = pmp->pm_uid;
293 vap->va_gid = pmp->pm_gid;
295 vap->va_rdev = NODEV;
296 vap->va_size = dep->de_FileSize;
297 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime);
298 vap->va_ctime = vap->va_mtime;
299 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
300 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime);
301 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun,
302 0, &vap->va_birthtime);
304 vap->va_atime = vap->va_mtime;
305 vap->va_birthtime.tv_sec = -1;
306 vap->va_birthtime.tv_nsec = 0;
309 if (dep->de_Attributes & ATTR_ARCHIVE)
310 vap->va_flags |= UF_ARCHIVE;
311 if (dep->de_Attributes & ATTR_HIDDEN)
312 vap->va_flags |= UF_HIDDEN;
313 if (dep->de_Attributes & ATTR_READONLY)
314 vap->va_flags |= UF_READONLY;
315 if (dep->de_Attributes & ATTR_SYSTEM)
316 vap->va_flags |= UF_SYSTEM;
318 vap->va_blocksize = pmp->pm_bpcluster;
320 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
321 vap->va_type = ap->a_vp->v_type;
322 vap->va_filerev = dep->de_modrev;
327 msdosfs_setattr(struct vop_setattr_args *ap)
329 struct vnode *vp = ap->a_vp;
330 struct denode *dep = VTODE(ap->a_vp);
331 struct msdosfsmount *pmp = dep->de_pmp;
332 struct vattr *vap = ap->a_vap;
333 struct ucred *cred = ap->a_cred;
334 struct thread *td = curthread;
338 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n",
339 ap->a_vp, vap, cred);
343 * Check for unsettable attributes.
345 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
346 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
347 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
348 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
350 printf("msdosfs_setattr(): returning EINVAL\n");
351 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n",
352 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid);
353 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n",
354 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen);
355 printf(" va_uid %x, va_gid %x\n",
356 vap->va_uid, vap->va_gid);
362 * We don't allow setting attributes on the root directory.
363 * The special case for the root directory is because before
364 * FAT32, the root directory didn't have an entry for itself
365 * (and was otherwise special). With FAT32, the root
366 * directory is not so special, but still doesn't have an
369 if (vp->v_vflag & VV_ROOT)
372 if (vap->va_flags != VNOVAL) {
373 if (vp->v_mount->mnt_flag & MNT_RDONLY)
375 if (cred->cr_uid != pmp->pm_uid) {
376 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
381 * We are very inconsistent about handling unsupported
382 * attributes. We ignored the access time and the
383 * read and execute bits. We were strict for the other
386 if (vap->va_flags & ~(UF_ARCHIVE | UF_HIDDEN | UF_READONLY |
389 if (vap->va_flags & UF_ARCHIVE)
390 dep->de_Attributes |= ATTR_ARCHIVE;
392 dep->de_Attributes &= ~ATTR_ARCHIVE;
393 if (vap->va_flags & UF_HIDDEN)
394 dep->de_Attributes |= ATTR_HIDDEN;
396 dep->de_Attributes &= ~ATTR_HIDDEN;
397 /* We don't allow changing the readonly bit on directories. */
398 if (vp->v_type != VDIR) {
399 if (vap->va_flags & UF_READONLY)
400 dep->de_Attributes |= ATTR_READONLY;
402 dep->de_Attributes &= ~ATTR_READONLY;
404 if (vap->va_flags & UF_SYSTEM)
405 dep->de_Attributes |= ATTR_SYSTEM;
407 dep->de_Attributes &= ~ATTR_SYSTEM;
408 dep->de_flag |= DE_MODIFIED;
411 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
415 if (vp->v_mount->mnt_flag & MNT_RDONLY)
418 if (uid == (uid_t)VNOVAL)
421 if (gid == (gid_t)VNOVAL)
423 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid ||
424 (gid != pmp->pm_gid && !groupmember(gid, cred))) {
425 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
429 if (uid != pmp->pm_uid || gid != pmp->pm_gid)
433 if (vap->va_size != VNOVAL) {
434 switch (vp->v_type) {
439 * Truncation is only supported for regular files,
440 * Disallow it if the filesystem is read-only.
442 if (vp->v_mount->mnt_flag & MNT_RDONLY)
447 * According to POSIX, the result is unspecified
448 * for file types other than regular files,
449 * directories and shared memory objects. We
450 * don't support any file types except regular
451 * files and directories in this file system, so
452 * this (default) case is unreachable and can do
453 * anything. Keep falling through to detrunc()
458 error = detrunc(dep, vap->va_size, 0, cred);
462 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
463 if (vp->v_mount->mnt_flag & MNT_RDONLY)
465 error = vn_utimes_perm(vp, vap, cred, td);
468 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 &&
469 vap->va_atime.tv_sec != VNOVAL) {
470 dep->de_flag &= ~DE_ACCESS;
471 timespec2fattime(&vap->va_atime, 0,
472 &dep->de_ADate, NULL, NULL);
474 if (vap->va_mtime.tv_sec != VNOVAL) {
475 dep->de_flag &= ~DE_UPDATE;
476 timespec2fattime(&vap->va_mtime, 0,
477 &dep->de_MDate, &dep->de_MTime, NULL);
480 * We don't set the archive bit when modifying the time of
481 * a directory to emulate the Windows/DOS behavior.
483 if (vp->v_type != VDIR)
484 dep->de_Attributes |= ATTR_ARCHIVE;
485 dep->de_flag |= DE_MODIFIED;
488 * DOS files only have the ability to have their writability
489 * attribute set, so we use the owner write bit to set the readonly
492 if (vap->va_mode != (mode_t)VNOVAL) {
493 if (vp->v_mount->mnt_flag & MNT_RDONLY)
495 if (cred->cr_uid != pmp->pm_uid) {
496 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
500 if (vp->v_type != VDIR) {
501 /* We ignore the read and execute bits. */
502 if (vap->va_mode & VWRITE)
503 dep->de_Attributes &= ~ATTR_READONLY;
505 dep->de_Attributes |= ATTR_READONLY;
506 dep->de_Attributes |= ATTR_ARCHIVE;
507 dep->de_flag |= DE_MODIFIED;
510 return (deupdat(dep, 0));
514 msdosfs_read(struct vop_read_args *ap)
528 struct vnode *vp = ap->a_vp;
529 struct denode *dep = VTODE(vp);
530 struct msdosfsmount *pmp = dep->de_pmp;
531 struct uio *uio = ap->a_uio;
534 * If they didn't ask for any data, then we are done.
536 orig_resid = uio->uio_resid;
541 * The caller is supposed to ensure that
542 * uio->uio_offset >= 0 and uio->uio_resid >= 0.
543 * We don't need to check for large offsets as in ffs because
544 * dep->de_FileSize <= DOS_FILESIZE_MAX < OFF_MAX, so large
545 * offsets cannot cause overflow even in theory.
548 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
550 isadir = dep->de_Attributes & ATTR_DIRECTORY;
552 if (uio->uio_offset >= dep->de_FileSize)
554 lbn = de_cluster(pmp, uio->uio_offset);
556 blsize = pmp->pm_bpcluster;
557 on = uio->uio_offset & pmp->pm_crbomask;
559 * If we are operating on a directory file then be sure to
560 * do i/o with the vnode for the filesystem instead of the
561 * vnode for the directory.
564 /* convert cluster # to block # */
565 error = pcbmap(dep, lbn, &lbn, 0, &blsize);
566 if (error == E2BIG) {
571 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp);
572 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) {
573 error = bread(vp, lbn, blsize, NOCRED, &bp);
574 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
575 error = cluster_read(vp, dep->de_FileSize, lbn, blsize,
576 NOCRED, on + uio->uio_resid, seqcount, 0, &bp);
577 } else if (seqcount > 1) {
579 error = breadn(vp, lbn,
580 blsize, &rablock, &rasize, 1, NOCRED, &bp);
582 error = bread(vp, lbn, blsize, NOCRED, &bp);
588 diff = pmp->pm_bpcluster - on;
589 n = diff > uio->uio_resid ? uio->uio_resid : diff;
590 diff = dep->de_FileSize - uio->uio_offset;
593 diff = blsize - bp->b_resid;
596 error = uiomove(bp->b_data + on, (int) n, uio);
598 } while (error == 0 && uio->uio_resid > 0 && n != 0);
599 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) &&
600 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0)
601 dep->de_flag |= DE_ACCESS;
606 * Write data to a file or directory.
609 msdosfs_write(struct vop_write_args *ap)
620 int ioflag = ap->a_ioflag;
621 struct uio *uio = ap->a_uio;
622 struct vnode *vp = ap->a_vp;
623 struct vnode *thisvp;
624 struct denode *dep = VTODE(vp);
625 struct msdosfsmount *pmp = dep->de_pmp;
626 struct ucred *cred = ap->a_cred;
629 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
630 vp, uio, ioflag, cred);
631 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
632 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
635 switch (vp->v_type) {
637 if (ioflag & IO_APPEND)
638 uio->uio_offset = dep->de_FileSize;
644 panic("msdosfs_write(): bad file type");
648 * This is needed (unlike in ffs_write()) because we extend the
649 * file outside of the loop but we don't want to extend the file
650 * for writes of 0 bytes.
652 if (uio->uio_resid == 0)
656 * The caller is supposed to ensure that
657 * uio->uio_offset >= 0 and uio->uio_resid >= 0.
659 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX)
663 * If they've exceeded their filesize limit, tell them about it.
665 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
669 * If the offset we are starting the write at is beyond the end of
670 * the file, then they've done a seek. Unix filesystems allow
671 * files with holes in them, DOS doesn't so we must fill the hole
672 * with zeroed blocks.
674 if (uio->uio_offset > dep->de_FileSize) {
675 error = deextend(dep, uio->uio_offset, cred);
681 * Remember some values in case the write fails.
683 resid = uio->uio_resid;
684 osize = dep->de_FileSize;
687 * If we write beyond the end of the file, extend it to its ultimate
688 * size ahead of the time to hopefully get a contiguous area.
690 if (uio->uio_offset + resid > osize) {
691 count = de_clcount(pmp, uio->uio_offset + resid) -
692 de_clcount(pmp, osize);
693 error = extendfile(dep, count, NULL, NULL, 0);
694 if (error && (error != ENOSPC || (ioflag & IO_UNIT)))
696 lastcn = dep->de_fc[FC_LASTFC].fc_frcn;
698 lastcn = de_clcount(pmp, osize) - 1;
700 seqcount = ioflag >> IO_SEQSHIFT;
702 if (de_cluster(pmp, uio->uio_offset) > lastcn) {
707 croffset = uio->uio_offset & pmp->pm_crbomask;
708 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset);
709 if (uio->uio_offset + n > dep->de_FileSize) {
710 dep->de_FileSize = uio->uio_offset + n;
711 /* The object size needs to be set before buffer is allocated */
712 vnode_pager_setsize(vp, dep->de_FileSize);
715 bn = de_cluster(pmp, uio->uio_offset);
716 if ((uio->uio_offset & pmp->pm_crbomask) == 0
717 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid)
718 > de_cluster(pmp, uio->uio_offset)
719 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) {
721 * If either the whole cluster gets written,
722 * or we write the cluster from its start beyond EOF,
723 * then no need to read data from disk.
725 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0);
728 * Do the bmap now, since pcbmap needs buffers
729 * for the fat table. (see msdosfs_strategy)
731 if (bp->b_blkno == bp->b_lblkno) {
732 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0);
738 if (bp->b_blkno == -1) {
741 error = EIO; /* XXX */
746 * The block we need to write into exists, so read it in.
748 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp);
756 * Should these vnode_pager_* functions be done on dir
761 * Copy the data from user space into the buf header.
763 error = uiomove(bp->b_data + croffset, n, uio);
769 /* Prepare for clustered writes in some else clauses. */
770 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
771 bp->b_flags |= B_CLUSTEROK;
774 * If IO_SYNC, then each buffer is written synchronously.
775 * Otherwise, if we have a severe page deficiency then
776 * write the buffer asynchronously. Otherwise, if on a
777 * cluster boundary then write the buffer asynchronously,
778 * combining it with contiguous clusters if permitted and
779 * possible, since we don't expect more writes into this
780 * buffer soon. Otherwise, do a delayed write because we
781 * expect more writes into this buffer soon.
783 if (ioflag & IO_SYNC)
785 else if (vm_page_count_severe() || buf_dirty_count_severe())
787 else if (n + croffset == pmp->pm_bpcluster) {
788 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
789 cluster_write(vp, bp, dep->de_FileSize,
795 dep->de_flag |= DE_UPDATE;
796 } while (error == 0 && uio->uio_resid > 0);
799 * If the write failed and they want us to, truncate the file back
800 * to the size it was before the write was attempted.
804 if (ioflag & IO_UNIT) {
805 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED);
806 uio->uio_offset -= resid - uio->uio_resid;
807 uio->uio_resid = resid;
809 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED);
810 if (uio->uio_resid != resid)
813 } else if (ioflag & IO_SYNC)
814 error = deupdat(dep, 1);
819 * Flush the blocks of a file to disk.
822 msdosfs_fsync(struct vop_fsync_args *ap)
830 * If the syncing request comes from fsync(2), sync the entire
831 * FAT and any other metadata that happens to be on devvp. We
832 * need this mainly for the FAT. We write the FAT sloppily, and
833 * syncing it all now is the best we can easily do to get all
834 * directory entries associated with the file (not just the file)
835 * fully synced. The other metadata includes critical metadata
836 * for all directory entries, but only in the MNT_ASYNC case. We
837 * will soon sync all metadata in the file's directory entry.
838 * Non-critical metadata for associated directory entries only
839 * gets synced accidentally, as in most file systems.
841 if (ap->a_waitfor == MNT_WAIT) {
842 devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp;
843 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
844 allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td);
845 VOP_UNLOCK(devvp, 0);
849 error = deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT);
856 msdosfs_remove(struct vop_remove_args *ap)
858 struct denode *dep = VTODE(ap->a_vp);
859 struct denode *ddep = VTODE(ap->a_dvp);
862 if (ap->a_vp->v_type == VDIR)
865 error = removede(ddep, dep);
867 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount);
873 * DOS filesystems don't know what links are.
876 msdosfs_link(struct vop_link_args *ap)
882 * Renames on files require moving the denode to a new hash queue since the
883 * denode's location is used to compute which hash queue to put the file
884 * in. Unless it is a rename in place. For example "mv a b".
886 * What follows is the basic algorithm:
889 * if (dest file exists) {
892 * if (dest and src in same directory) {
893 * rewrite name in existing directory slot
895 * write new entry in dest directory
896 * update offset and dirclust in denode
897 * move denode to new hash chain
898 * clear old directory entry
902 * if (dest directory exists) {
903 * if (dest is not empty) {
906 * remove dest directory
908 * if (dest and src in same directory) {
909 * rewrite name in existing entry
911 * be sure dest is not a child of src directory
912 * write entry in dest directory
913 * update "." and ".." in moved directory
914 * clear old directory entry for moved directory
919 * source's parent directory is unlocked
920 * source file or directory is unlocked
921 * destination's parent directory is locked
922 * destination file or directory is locked if it exists
925 * all denodes should be released
928 msdosfs_rename(struct vop_rename_args *ap)
930 struct vnode *tdvp = ap->a_tdvp;
931 struct vnode *fvp = ap->a_fvp;
932 struct vnode *fdvp = ap->a_fdvp;
933 struct vnode *tvp = ap->a_tvp;
934 struct componentname *tcnp = ap->a_tcnp;
935 struct componentname *fcnp = ap->a_fcnp;
936 struct denode *ip, *xp, *dp, *zp;
937 u_char toname[12], oldname[11];
938 u_long from_diroffset, to_diroffset;
940 int doingdirectory = 0, newparent = 0;
944 struct denode *fddep; /* from file's parent directory */
945 struct msdosfsmount *pmp;
946 struct direntry *dotdotp;
949 fddep = VTODE(ap->a_fdvp);
952 pmp = VFSTOMSDOSFS(fdvp->v_mount);
955 if ((tcnp->cn_flags & HASBUF) == 0 ||
956 (fcnp->cn_flags & HASBUF) == 0)
957 panic("msdosfs_rename: no name");
960 * Check for cross-device rename.
962 if (fvp->v_mount != tdvp->v_mount ||
963 (tvp && fvp->v_mount != tvp->v_mount)) {
978 * If source and dest are the same, do nothing.
985 error = vn_lock(fvp, LK_EXCLUSIVE);
992 * Be sure we are not renaming ".", "..", or an alias of ".". This
993 * leads to a crippled directory tree. It's pretty tough to do a
994 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
995 * doesn't work if the ".." entry is missing.
997 if (ip->de_Attributes & ATTR_DIRECTORY) {
999 * Avoid ".", "..", and aliases of "." for obvious reasons.
1001 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
1003 (fcnp->cn_flags & ISDOTDOT) ||
1004 (tcnp->cn_flags & ISDOTDOT) ||
1005 (ip->de_flag & DE_RENAME)) {
1010 ip->de_flag |= DE_RENAME;
1015 * When the target exists, both the directory
1016 * and target vnodes are returned locked.
1019 xp = tvp ? VTODE(tvp) : NULL;
1021 * Remember direntry place to use for destination
1023 to_diroffset = dp->de_fndoffset;
1024 to_count = dp->de_fndcnt;
1027 * If ".." must be changed (ie the directory gets a new
1028 * parent) then the source directory must not be in the
1029 * directory hierarchy above the target, as this would
1030 * orphan everything below the source directory. Also
1031 * the user must have write permission in the source so
1032 * as to be able to change "..". We must repeat the call
1033 * to namei, as the parent directory is unlocked by the
1034 * call to doscheckpath().
1036 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
1038 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
1040 if (doingdirectory && newparent) {
1041 if (error) /* write access check above */
1046 * doscheckpath() vput()'s dp,
1047 * so we have to do a relookup afterwards
1049 error = doscheckpath(ip, dp);
1052 if ((tcnp->cn_flags & SAVESTART) == 0)
1053 panic("msdosfs_rename: lost to startdir");
1054 error = relookup(tdvp, &tvp, tcnp);
1058 xp = tvp ? VTODE(tvp) : NULL;
1063 * Target must be empty if a directory and have no links
1064 * to it. Also, ensure source and target are compatible
1065 * (both directories, or both not directories).
1067 if (xp->de_Attributes & ATTR_DIRECTORY) {
1068 if (!dosdirempty(xp)) {
1072 if (!doingdirectory) {
1077 } else if (doingdirectory) {
1081 error = removede(dp, xp);
1089 * Convert the filename in tcnp into a dos filename. We copy this
1090 * into the denode and directory entry for the destination
1093 error = uniqdosname(VTODE(tdvp), tcnp, toname);
1098 * Since from wasn't locked at various places above,
1099 * have to do a relookup here.
1101 fcnp->cn_flags &= ~MODMASK;
1102 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1103 if ((fcnp->cn_flags & SAVESTART) == 0)
1104 panic("msdosfs_rename: lost from startdir");
1106 VOP_UNLOCK(tdvp, 0);
1107 if (relookup(fdvp, &fvp, fcnp) == 0)
1111 * From name has disappeared.
1114 panic("rename: lost dir entry");
1116 VOP_UNLOCK(tdvp, 0);
1123 from_diroffset = zp->de_fndoffset;
1126 * Ensure that the directory entry still exists and has not
1127 * changed till now. If the source is a file the entry may
1128 * have been unlinked or renamed. In either case there is
1129 * no further work to be done. If the source is a directory
1130 * then it cannot have been rmdir'ed or renamed; this is
1131 * prohibited by the DE_RENAME flag.
1135 panic("rename: lost dir entry");
1138 VOP_UNLOCK(fdvp, 0);
1146 * First write a new entry in the destination
1147 * directory and mark the entry in the source directory
1148 * as deleted. Then move the denode to the correct hash
1149 * chain for its new location in the filesystem. And, if
1150 * we moved a directory, then update its .. entry to point
1151 * to the new parent directory.
1153 bcopy(ip->de_Name, oldname, 11);
1154 bcopy(toname, ip->de_Name, 11); /* update denode */
1155 dp->de_fndoffset = to_diroffset;
1156 dp->de_fndcnt = to_count;
1157 error = createde(ip, dp, (struct denode **)0, tcnp);
1159 bcopy(oldname, ip->de_Name, 11);
1161 VOP_UNLOCK(fdvp, 0);
1166 * If ip is for a directory, then its name should always
1167 * be "." since it is for the directory entry in the
1168 * directory itself (msdosfs_lookup() always translates
1169 * to the "." entry so as to get a unique denode, except
1170 * for the root directory there are different
1171 * complications). However, we just corrupted its name
1172 * to pass the correct name to createde(). Undo this.
1174 if ((ip->de_Attributes & ATTR_DIRECTORY) != 0)
1175 bcopy(oldname, ip->de_Name, 11);
1177 zp->de_fndoffset = from_diroffset;
1178 error = removede(zp, ip);
1180 /* XXX should downgrade to ro here, fs is corrupt */
1182 VOP_UNLOCK(fdvp, 0);
1186 if (!doingdirectory) {
1187 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0,
1188 &ip->de_dirclust, 0);
1190 /* XXX should downgrade to ro here, fs is corrupt */
1192 VOP_UNLOCK(fdvp, 0);
1196 if (ip->de_dirclust == MSDOSFSROOT)
1197 ip->de_diroffset = to_diroffset;
1199 ip->de_diroffset = to_diroffset & pmp->pm_crbomask;
1203 VOP_UNLOCK(fdvp, 0);
1207 * If we moved a directory to a new parent directory, then we must
1208 * fixup the ".." entry in the moved directory.
1210 if (doingdirectory && newparent) {
1211 cn = ip->de_StartCluster;
1212 if (cn == MSDOSFSROOT) {
1213 /* this should never happen */
1214 panic("msdosfs_rename(): updating .. in root directory?");
1216 bn = cntobn(pmp, cn);
1217 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
1220 /* XXX should downgrade to ro here, fs is corrupt */
1225 dotdotp = (struct direntry *)bp->b_data + 1;
1226 pcl = dp->de_StartCluster;
1227 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1229 putushort(dotdotp->deStartCluster, pcl);
1231 putushort(dotdotp->deHighClust, pcl >> 16);
1232 if (DOINGASYNC(fvp))
1234 else if ((error = bwrite(bp)) != 0) {
1235 /* XXX should downgrade to ro here, fs is corrupt */
1242 * The msdosfs lookup is case insensitive. Several aliases may
1243 * be inserted for a single directory entry. As a consequnce,
1244 * name cache purge done by lookup for fvp when DELETE op for
1245 * namei is specified, might be not enough to expunge all
1246 * namecache entries that were installed for this direntry.
1255 ip->de_flag &= ~DE_RENAME;
1263 struct direntry dot;
1264 struct direntry dotdot;
1265 } dosdirtemplate = {
1266 { ". ", /* the . entry */
1267 ATTR_DIRECTORY, /* file attribute */
1269 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1270 { 0, 0 }, /* access date */
1271 { 0, 0 }, /* high bits of start cluster */
1272 { 210, 4 }, { 210, 4 }, /* modify time & date */
1273 { 0, 0 }, /* startcluster */
1274 { 0, 0, 0, 0 } /* filesize */
1276 { ".. ", /* the .. entry */
1277 ATTR_DIRECTORY, /* file attribute */
1279 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1280 { 0, 0 }, /* access date */
1281 { 0, 0 }, /* high bits of start cluster */
1282 { 210, 4 }, { 210, 4 }, /* modify time & date */
1283 { 0, 0 }, /* startcluster */
1284 { 0, 0, 0, 0 } /* filesize */
1289 msdosfs_mkdir(struct vop_mkdir_args *ap)
1291 struct componentname *cnp = ap->a_cnp;
1293 struct denode *pdep = VTODE(ap->a_dvp);
1294 struct direntry *denp;
1295 struct msdosfsmount *pmp = pdep->de_pmp;
1297 u_long newcluster, pcl;
1300 struct denode ndirent;
1304 * If this is the root directory and there is no space left we
1305 * can't do anything. This is because the root directory can not
1308 if (pdep->de_StartCluster == MSDOSFSROOT
1309 && pdep->de_fndoffset >= pdep->de_FileSize) {
1315 * Allocate a cluster to hold the about to be created directory.
1317 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL);
1321 bzero(&ndirent, sizeof(ndirent));
1322 ndirent.de_pmp = pmp;
1323 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1325 DETIMES(&ndirent, &ts, &ts, &ts);
1328 * Now fill the cluster with the "." and ".." entries. And write
1329 * the cluster to disk. This way it is there for the parent
1330 * directory to be pointing at if there were a crash.
1332 bn = cntobn(pmp, newcluster);
1333 /* always succeeds */
1334 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0);
1335 bzero(bp->b_data, pmp->pm_bpcluster);
1336 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate);
1337 denp = (struct direntry *)bp->b_data;
1338 putushort(denp[0].deStartCluster, newcluster);
1339 putushort(denp[0].deCDate, ndirent.de_CDate);
1340 putushort(denp[0].deCTime, ndirent.de_CTime);
1341 denp[0].deCHundredth = ndirent.de_CHun;
1342 putushort(denp[0].deADate, ndirent.de_ADate);
1343 putushort(denp[0].deMDate, ndirent.de_MDate);
1344 putushort(denp[0].deMTime, ndirent.de_MTime);
1345 pcl = pdep->de_StartCluster;
1347 * Although the root directory has a non-magic starting cluster
1348 * number for FAT32, chkdsk and fsck_msdosfs still require
1349 * references to it in dotdot entries to be magic.
1351 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1353 putushort(denp[1].deStartCluster, pcl);
1354 putushort(denp[1].deCDate, ndirent.de_CDate);
1355 putushort(denp[1].deCTime, ndirent.de_CTime);
1356 denp[1].deCHundredth = ndirent.de_CHun;
1357 putushort(denp[1].deADate, ndirent.de_ADate);
1358 putushort(denp[1].deMDate, ndirent.de_MDate);
1359 putushort(denp[1].deMTime, ndirent.de_MTime);
1361 putushort(denp[0].deHighClust, newcluster >> 16);
1362 putushort(denp[1].deHighClust, pcl >> 16);
1365 if (DOINGASYNC(ap->a_dvp))
1367 else if ((error = bwrite(bp)) != 0)
1371 * Now build up a directory entry pointing to the newly allocated
1372 * cluster. This will be written to an empty slot in the parent
1376 if ((cnp->cn_flags & HASBUF) == 0)
1377 panic("msdosfs_mkdir: no name");
1379 error = uniqdosname(pdep, cnp, ndirent.de_Name);
1383 ndirent.de_Attributes = ATTR_DIRECTORY;
1384 ndirent.de_LowerCase = 0;
1385 ndirent.de_StartCluster = newcluster;
1386 ndirent.de_FileSize = 0;
1387 error = createde(&ndirent, pdep, &dep, cnp);
1390 *ap->a_vpp = DETOV(dep);
1394 clusterfree(pmp, newcluster, NULL);
1400 msdosfs_rmdir(struct vop_rmdir_args *ap)
1402 struct vnode *vp = ap->a_vp;
1403 struct vnode *dvp = ap->a_dvp;
1404 struct componentname *cnp = ap->a_cnp;
1405 struct denode *ip, *dp;
1412 * Verify the directory is empty (and valid).
1413 * (Rmdir ".." won't be valid since
1414 * ".." will contain a reference to
1415 * the current directory and thus be
1419 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) {
1424 * Delete the entry from the directory. For dos filesystems this
1425 * gets rid of the directory entry on disk, the in memory copy
1426 * still exists but the de_refcnt is <= 0. This prevents it from
1427 * being found by deget(). When the vput() on dep is done we give
1428 * up access and eventually msdosfs_reclaim() will be called which
1429 * will remove it from the denode cache.
1431 error = removede(dp, ip);
1435 * This is where we decrement the link count in the parent
1436 * directory. Since dos filesystems don't do this we just purge
1441 * Truncate the directory that is being deleted.
1443 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred);
1451 * DOS filesystems don't know what symlinks are.
1454 msdosfs_symlink(struct vop_symlink_args *ap)
1456 return (EOPNOTSUPP);
1460 msdosfs_readdir(struct vop_readdir_args *ap)
1474 struct denode *dep = VTODE(ap->a_vp);
1475 struct msdosfsmount *pmp = dep->de_pmp;
1476 struct direntry *dentp;
1477 struct dirent dirbuf;
1478 struct uio *uio = ap->a_uio;
1479 u_long *cookies = NULL;
1484 #ifdef MSDOSFS_DEBUG
1485 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
1486 ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
1490 * msdosfs_readdir() won't operate properly on regular files since
1491 * it does i/o only with the filesystem vnode, and hence can
1492 * retrieve the wrong block from the buffer cache for a plain file.
1493 * So, fail attempts to readdir() on a plain file.
1495 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
1499 * To be safe, initialize dirbuf
1501 bzero(dirbuf.d_name, sizeof(dirbuf.d_name));
1504 * If the user buffer is smaller than the size of one dos directory
1505 * entry or the file offset is not a multiple of the size of a
1506 * directory entry, then we fail the read.
1508 off = offset = uio->uio_offset;
1509 if (uio->uio_resid < sizeof(struct direntry) ||
1510 (offset & (sizeof(struct direntry) - 1)))
1513 if (ap->a_ncookies) {
1514 ncookies = uio->uio_resid / 16;
1515 cookies = malloc(ncookies * sizeof(u_long), M_TEMP,
1517 *ap->a_cookies = cookies;
1518 *ap->a_ncookies = ncookies;
1521 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1524 * If they are reading from the root directory then, we simulate
1525 * the . and .. entries since these don't exist in the root
1526 * directory. We also set the offset bias to make up for having to
1527 * simulate these entries. By this I mean that at file offset 64 we
1528 * read the first entry in the root directory that lives on disk.
1530 if (dep->de_StartCluster == MSDOSFSROOT
1531 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
1533 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n",
1536 bias = 2 * sizeof(struct direntry);
1537 if (offset < bias) {
1538 for (n = (int)offset / sizeof(struct direntry);
1541 fileno = (uint64_t)cntobn(pmp,
1546 if (pmp->pm_flags & MSDOSFS_LARGEFS) {
1548 msdosfs_fileno_map(pmp->pm_mountp,
1552 dirbuf.d_fileno = (uint32_t)fileno;
1554 dirbuf.d_type = DT_DIR;
1557 dirbuf.d_namlen = 1;
1558 strcpy(dirbuf.d_name, ".");
1561 dirbuf.d_namlen = 2;
1562 strcpy(dirbuf.d_name, "..");
1565 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1566 if (uio->uio_resid < dirbuf.d_reclen)
1568 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1571 offset += sizeof(struct direntry);
1574 *cookies++ = offset;
1575 if (--ncookies <= 0)
1584 while (uio->uio_resid > 0) {
1585 lbn = de_cluster(pmp, offset - bias);
1586 on = (offset - bias) & pmp->pm_crbomask;
1587 n = min(pmp->pm_bpcluster - on, uio->uio_resid);
1588 diff = dep->de_FileSize - (offset - bias);
1592 error = pcbmap(dep, lbn, &bn, &cn, &blsize);
1595 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp);
1600 n = min(n, blsize - bp->b_resid);
1607 * Convert from dos directory entries to fs-independent
1608 * directory entries.
1610 for (dentp = (struct direntry *)(bp->b_data + on);
1611 (char *)dentp < bp->b_data + on + n;
1612 dentp++, offset += sizeof(struct direntry)) {
1614 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
1615 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
1618 * If this is an unused entry, we can stop.
1620 if (dentp->deName[0] == SLOT_EMPTY) {
1625 * Skip deleted entries.
1627 if (dentp->deName[0] == SLOT_DELETED) {
1634 * Handle Win95 long directory entries
1636 if (dentp->deAttributes == ATTR_WIN95) {
1637 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
1639 chksum = win2unixfn(&nb,
1640 (struct winentry *)dentp, chksum, pmp);
1645 * Skip volume labels
1647 if (dentp->deAttributes & ATTR_VOLUME) {
1653 * This computation of d_fileno must match
1654 * the computation of va_fileid in
1657 if (dentp->deAttributes & ATTR_DIRECTORY) {
1658 fileno = getushort(dentp->deStartCluster);
1660 fileno |= getushort(dentp->deHighClust) << 16;
1661 /* if this is the root directory */
1662 if (fileno == MSDOSFSROOT)
1664 fileno = (uint64_t)cntobn(pmp,
1670 fileno = (uint64_t)cntobn(pmp, fileno) *
1672 dirbuf.d_type = DT_DIR;
1674 fileno = (uoff_t)offset /
1675 sizeof(struct direntry);
1676 dirbuf.d_type = DT_REG;
1678 if (pmp->pm_flags & MSDOSFS_LARGEFS) {
1680 msdosfs_fileno_map(pmp->pm_mountp, fileno);
1682 dirbuf.d_fileno = (uint32_t)fileno;
1684 if (chksum != winChksum(dentp->deName)) {
1685 dirbuf.d_namlen = dos2unixfn(dentp->deName,
1686 (u_char *)dirbuf.d_name,
1687 dentp->deLowerCase |
1688 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ?
1689 (LCASE_BASE | LCASE_EXT) : 0),
1693 mbnambuf_flush(&nb, &dirbuf);
1695 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1696 if (uio->uio_resid < dirbuf.d_reclen) {
1700 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1706 *cookies++ = offset + sizeof(struct direntry);
1707 if (--ncookies <= 0) {
1712 off = offset + sizeof(struct direntry);
1717 /* Subtract unused cookies */
1719 *ap->a_ncookies -= ncookies;
1721 uio->uio_offset = off;
1724 * Set the eofflag (NFS uses it)
1726 if (ap->a_eofflag) {
1727 if (dep->de_FileSize - (offset - bias) <= 0)
1736 * a_vp - pointer to the file's vnode
1737 * a_bn - logical block number within the file (cluster number for us)
1738 * a_bop - where to return the bufobj of the special file containing the fs
1739 * a_bnp - where to return the "physical" block number corresponding to a_bn
1740 * (relative to the special file; units are blocks of size DEV_BSIZE)
1741 * a_runp - where to return the "run past" a_bn. This is the count of logical
1742 * blocks whose physical blocks (together with a_bn's physical block)
1744 * a_runb - where to return the "run before" a_bn.
1747 msdosfs_bmap(struct vop_bmap_args *ap)
1751 struct msdosfsmount *pmp;
1755 int bnpercn, error, maxio, maxrun, run;
1760 if (ap->a_bop != NULL)
1761 *ap->a_bop = &pmp->pm_devvp->v_bufobj;
1762 if (ap->a_bnp == NULL)
1764 if (ap->a_runp != NULL)
1766 if (ap->a_runb != NULL)
1771 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL);
1772 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL))
1776 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize;
1777 bnpercn = de_cn2bn(pmp, 1);
1778 if (ap->a_runp != NULL) {
1779 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn);
1780 for (run = 1; run <= maxrun; run++) {
1781 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 ||
1782 runbn != *ap->a_bnp + run * bnpercn)
1785 *ap->a_runp = run - 1;
1787 if (ap->a_runb != NULL) {
1788 maxrun = ulmin(maxio - 1, cn);
1789 for (run = 1; run < maxrun; run++) {
1790 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 ||
1791 runbn != *ap->a_bnp - run * bnpercn)
1794 *ap->a_runb = run - 1;
1800 msdosfs_strategy(struct vop_strategy_args *ap)
1802 struct buf *bp = ap->a_bp;
1803 struct denode *dep = VTODE(ap->a_vp);
1809 * If we don't already know the filesystem relative block number
1810 * then get it using pcbmap(). If pcbmap() returns the block
1811 * number as -1 then we've got a hole in the file. DOS filesystems
1812 * don't allow files with holes, so we shouldn't ever see this.
1814 if (bp->b_blkno == bp->b_lblkno) {
1815 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0);
1816 bp->b_blkno = blkno;
1818 bp->b_error = error;
1819 bp->b_ioflags |= BIO_ERROR;
1823 if ((long)bp->b_blkno == -1)
1826 if (bp->b_blkno == -1) {
1831 * Read/write the block from/to the disk that contains the desired
1834 bp->b_iooffset = dbtob(bp->b_blkno);
1835 bo = dep->de_pmp->pm_bo;
1836 BO_STRATEGY(bo, bp);
1841 msdosfs_print(struct vop_print_args *ap)
1843 struct denode *dep = VTODE(ap->a_vp);
1845 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ",
1846 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
1847 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev));
1852 msdosfs_pathconf(struct vop_pathconf_args *ap)
1854 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp;
1856 switch (ap->a_name) {
1861 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12;
1864 *ap->a_retval = PATH_MAX;
1866 case _PC_CHOWN_RESTRICTED:
1879 msdosfs_vptofh(struct vop_vptofh_args *ap)
1882 struct defid *defhp;
1884 dep = VTODE(ap->a_vp);
1885 defhp = (struct defid *)ap->a_fhp;
1886 defhp->defid_len = sizeof(struct defid);
1887 defhp->defid_dirclust = dep->de_dirclust;
1888 defhp->defid_dirofs = dep->de_diroffset;
1889 /* defhp->defid_gen = dep->de_gen; */
1893 /* Global vfs data structures for msdosfs */
1894 struct vop_vector msdosfs_vnodeops = {
1895 .vop_default = &default_vnodeops,
1897 .vop_access = msdosfs_access,
1898 .vop_bmap = msdosfs_bmap,
1899 .vop_cachedlookup = msdosfs_lookup,
1900 .vop_open = msdosfs_open,
1901 .vop_close = msdosfs_close,
1902 .vop_create = msdosfs_create,
1903 .vop_fsync = msdosfs_fsync,
1904 .vop_getattr = msdosfs_getattr,
1905 .vop_inactive = msdosfs_inactive,
1906 .vop_link = msdosfs_link,
1907 .vop_lookup = vfs_cache_lookup,
1908 .vop_mkdir = msdosfs_mkdir,
1909 .vop_mknod = msdosfs_mknod,
1910 .vop_pathconf = msdosfs_pathconf,
1911 .vop_print = msdosfs_print,
1912 .vop_read = msdosfs_read,
1913 .vop_readdir = msdosfs_readdir,
1914 .vop_reclaim = msdosfs_reclaim,
1915 .vop_remove = msdosfs_remove,
1916 .vop_rename = msdosfs_rename,
1917 .vop_rmdir = msdosfs_rmdir,
1918 .vop_setattr = msdosfs_setattr,
1919 .vop_strategy = msdosfs_strategy,
1920 .vop_symlink = msdosfs_symlink,
1921 .vop_write = msdosfs_write,
1922 .vop_vptofh = msdosfs_vptofh,