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.
131 struct vop_create_args /* {
133 struct vnode **a_vpp;
134 struct componentname *a_cnp;
138 struct componentname *cnp = ap->a_cnp;
139 struct denode ndirent;
141 struct denode *pdep = VTODE(ap->a_dvp);
146 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap);
150 * If this is the root directory and there is no space left we
151 * can't do anything. This is because the root directory can not
154 if (pdep->de_StartCluster == MSDOSFSROOT
155 && pdep->de_fndoffset >= pdep->de_FileSize) {
161 * Create a directory entry for the file, then call createde() to
162 * have it installed. NOTE: DOS files are always executable. We
163 * use the absence of the owner write bit to make the file
167 if ((cnp->cn_flags & HASBUF) == 0)
168 panic("msdosfs_create: no name");
170 bzero(&ndirent, sizeof(ndirent));
171 error = uniqdosname(pdep, cnp, ndirent.de_Name);
175 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ?
176 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY;
177 ndirent.de_LowerCase = 0;
178 ndirent.de_StartCluster = 0;
179 ndirent.de_FileSize = 0;
180 ndirent.de_pmp = pdep->de_pmp;
181 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
183 DETIMES(&ndirent, &ts, &ts, &ts);
184 error = createde(&ndirent, pdep, &dep, cnp);
187 *ap->a_vpp = DETOV(dep);
196 struct vop_mknod_args /* {
198 struct vnode **a_vpp;
199 struct componentname *a_cnp;
209 struct vop_open_args /* {
212 struct ucred *a_cred;
217 struct denode *dep = VTODE(ap->a_vp);
218 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td);
224 struct vop_close_args /* {
227 struct ucred *a_cred;
231 struct vnode *vp = ap->a_vp;
232 struct denode *dep = VTODE(vp);
236 if (vp->v_usecount > 1) {
238 DETIMES(dep, &ts, &ts, &ts);
246 struct vop_access_args /* {
249 struct ucred *a_cred;
253 struct vnode *vp = ap->a_vp;
254 struct denode *dep = VTODE(ap->a_vp);
255 struct msdosfsmount *pmp = dep->de_pmp;
257 accmode_t accmode = ap->a_accmode;
259 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) |
260 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH));
261 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
264 * Disallow writing to directories and regular files if the
265 * filesystem is read-only.
267 if (accmode & VWRITE) {
268 switch (vp->v_type) {
271 if (vp->v_mount->mnt_flag & MNT_RDONLY)
279 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid,
280 ap->a_accmode, ap->a_cred, NULL));
285 struct vop_getattr_args /* {
288 struct ucred *a_cred;
291 struct denode *dep = VTODE(ap->a_vp);
292 struct msdosfsmount *pmp = dep->de_pmp;
293 struct vattr *vap = ap->a_vap;
296 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
300 DETIMES(dep, &ts, &ts, &ts);
301 vap->va_fsid = dev2udev(pmp->pm_dev);
303 * The following computation of the fileid must be the same as that
304 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
307 if (dep->de_Attributes & ATTR_DIRECTORY) {
308 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) *
310 if (dep->de_StartCluster == MSDOSFSROOT)
313 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) *
315 if (dep->de_dirclust == MSDOSFSROOT)
316 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk;
317 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry);
320 if (pmp->pm_flags & MSDOSFS_LARGEFS)
321 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid);
323 vap->va_fileid = (long)fileid;
325 if ((dep->de_Attributes & ATTR_READONLY) == 0)
326 mode = S_IRWXU|S_IRWXG|S_IRWXO;
328 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
329 vap->va_mode = mode &
330 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
331 vap->va_uid = pmp->pm_uid;
332 vap->va_gid = pmp->pm_gid;
334 vap->va_rdev = NODEV;
335 vap->va_size = dep->de_FileSize;
336 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime);
337 vap->va_ctime = vap->va_mtime;
338 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
339 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime);
340 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun,
341 0, &vap->va_birthtime);
343 vap->va_atime = vap->va_mtime;
344 vap->va_birthtime.tv_sec = -1;
345 vap->va_birthtime.tv_nsec = 0;
348 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0)
349 vap->va_flags |= SF_ARCHIVED;
351 vap->va_blocksize = pmp->pm_bpcluster;
353 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
354 vap->va_type = ap->a_vp->v_type;
355 vap->va_filerev = dep->de_modrev;
361 struct vop_setattr_args /* {
364 struct ucred *a_cred;
367 struct vnode *vp = ap->a_vp;
368 struct denode *dep = VTODE(ap->a_vp);
369 struct msdosfsmount *pmp = dep->de_pmp;
370 struct vattr *vap = ap->a_vap;
371 struct ucred *cred = ap->a_cred;
372 struct thread *td = curthread;
376 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n",
377 ap->a_vp, vap, cred);
381 * Check for unsettable attributes.
383 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
384 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
385 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
386 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
388 printf("msdosfs_setattr(): returning EINVAL\n");
389 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n",
390 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid);
391 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n",
392 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen);
393 printf(" va_uid %x, va_gid %x\n",
394 vap->va_uid, vap->va_gid);
398 if (vap->va_flags != VNOVAL) {
399 if (vp->v_mount->mnt_flag & MNT_RDONLY)
401 if (cred->cr_uid != pmp->pm_uid) {
402 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
407 * We are very inconsistent about handling unsupported
408 * attributes. We ignored the access time and the
409 * read and execute bits. We were strict for the other
412 * Here we are strict, stricter than ufs in not allowing
413 * users to attempt to set SF_SETTABLE bits or anyone to
414 * set unsupported bits. However, we ignore attempts to
415 * set ATTR_ARCHIVE for directories `cp -pr' from a more
416 * sensible filesystem attempts it a lot.
418 if (vap->va_flags & SF_SETTABLE) {
419 error = priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0);
423 if (vap->va_flags & ~SF_ARCHIVED)
425 if (vap->va_flags & SF_ARCHIVED)
426 dep->de_Attributes &= ~ATTR_ARCHIVE;
427 else if (!(dep->de_Attributes & ATTR_DIRECTORY))
428 dep->de_Attributes |= ATTR_ARCHIVE;
429 dep->de_flag |= DE_MODIFIED;
432 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
436 if (vp->v_mount->mnt_flag & MNT_RDONLY)
439 if (uid == (uid_t)VNOVAL)
442 if (gid == (gid_t)VNOVAL)
444 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid ||
445 (gid != pmp->pm_gid && !groupmember(gid, cred))) {
446 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
450 if (uid != pmp->pm_uid || gid != pmp->pm_gid)
454 if (vap->va_size != VNOVAL) {
455 switch (vp->v_type) {
460 * Truncation is only supported for regular files,
461 * Disallow it if the filesystem is read-only.
463 if (vp->v_mount->mnt_flag & MNT_RDONLY)
468 * According to POSIX, the result is unspecified
469 * for file types other than regular files,
470 * directories and shared memory objects. We
471 * don't support any file types except regular
472 * files and directories in this file system, so
473 * this (default) case is unreachable and can do
474 * anything. Keep falling through to detrunc()
479 error = detrunc(dep, vap->va_size, 0, cred, td);
483 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
484 if (vp->v_mount->mnt_flag & MNT_RDONLY)
486 if (vap->va_vaflags & VA_UTIMES_NULL) {
487 error = VOP_ACCESS(vp, VADMIN, cred, td);
489 error = VOP_ACCESS(vp, VWRITE, cred, td);
491 error = VOP_ACCESS(vp, VADMIN, cred, td);
492 if (vp->v_type != VDIR) {
493 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 &&
494 vap->va_atime.tv_sec != VNOVAL) {
495 dep->de_flag &= ~DE_ACCESS;
496 timespec2fattime(&vap->va_atime, 0,
497 &dep->de_ADate, NULL, NULL);
499 if (vap->va_mtime.tv_sec != VNOVAL) {
500 dep->de_flag &= ~DE_UPDATE;
501 timespec2fattime(&vap->va_mtime, 0,
502 &dep->de_MDate, &dep->de_MTime, NULL);
504 dep->de_Attributes |= ATTR_ARCHIVE;
505 dep->de_flag |= DE_MODIFIED;
509 * DOS files only have the ability to have their writability
510 * attribute set, so we use the owner write bit to set the readonly
513 if (vap->va_mode != (mode_t)VNOVAL) {
514 if (vp->v_mount->mnt_flag & MNT_RDONLY)
516 if (cred->cr_uid != pmp->pm_uid) {
517 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
521 if (vp->v_type != VDIR) {
522 /* We ignore the read and execute bits. */
523 if (vap->va_mode & VWRITE)
524 dep->de_Attributes &= ~ATTR_READONLY;
526 dep->de_Attributes |= ATTR_READONLY;
527 dep->de_Attributes |= ATTR_ARCHIVE;
528 dep->de_flag |= DE_MODIFIED;
531 return (deupdat(dep, 0));
536 struct vop_read_args /* {
540 struct ucred *a_cred;
555 struct vnode *vp = ap->a_vp;
556 struct denode *dep = VTODE(vp);
557 struct msdosfsmount *pmp = dep->de_pmp;
558 struct uio *uio = ap->a_uio;
561 * If they didn't ask for any data, then we are done.
563 orig_resid = uio->uio_resid;
568 * The caller is supposed to ensure that
569 * uio->uio_offset >= 0 and uio->uio_resid >= 0.
570 * We don't need to check for large offsets as in ffs because
571 * dep->de_FileSize <= DOS_FILESIZE_MAX < OFF_MAX, so large
572 * offsets cannot cause overflow even in theory.
575 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
577 isadir = dep->de_Attributes & ATTR_DIRECTORY;
579 if (uio->uio_offset >= dep->de_FileSize)
581 lbn = de_cluster(pmp, uio->uio_offset);
583 blsize = pmp->pm_bpcluster;
584 on = uio->uio_offset & pmp->pm_crbomask;
586 * If we are operating on a directory file then be sure to
587 * do i/o with the vnode for the filesystem instead of the
588 * vnode for the directory.
591 /* convert cluster # to block # */
592 error = pcbmap(dep, lbn, &lbn, 0, &blsize);
593 if (error == E2BIG) {
598 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp);
599 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) {
600 error = bread(vp, lbn, blsize, NOCRED, &bp);
601 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
602 error = cluster_read(vp, dep->de_FileSize, lbn, blsize,
603 NOCRED, on + uio->uio_resid, seqcount, &bp);
604 } else if (seqcount > 1) {
606 error = breadn(vp, lbn,
607 blsize, &rablock, &rasize, 1, NOCRED, &bp);
609 error = bread(vp, lbn, blsize, NOCRED, &bp);
615 diff = pmp->pm_bpcluster - on;
616 n = diff > uio->uio_resid ? uio->uio_resid : diff;
617 diff = dep->de_FileSize - uio->uio_offset;
620 diff = blsize - bp->b_resid;
623 error = uiomove(bp->b_data + on, (int) n, uio);
625 } while (error == 0 && uio->uio_resid > 0 && n != 0);
626 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) &&
627 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
628 dep->de_flag |= DE_ACCESS;
633 * Write data to a file or directory.
637 struct vop_write_args /* {
641 struct ucred *a_cred;
653 int ioflag = ap->a_ioflag;
654 struct uio *uio = ap->a_uio;
655 struct vnode *vp = ap->a_vp;
656 struct vnode *thisvp;
657 struct denode *dep = VTODE(vp);
658 struct msdosfsmount *pmp = dep->de_pmp;
659 struct ucred *cred = ap->a_cred;
662 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
663 vp, uio, ioflag, cred);
664 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
665 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
668 switch (vp->v_type) {
670 if (ioflag & IO_APPEND)
671 uio->uio_offset = dep->de_FileSize;
677 panic("msdosfs_write(): bad file type");
681 * This is needed (unlike in ffs_write()) because we extend the
682 * file outside of the loop but we don't want to extend the file
683 * for writes of 0 bytes.
685 if (uio->uio_resid == 0)
689 * The caller is supposed to ensure that
690 * uio->uio_offset >= 0 and uio->uio_resid >= 0.
692 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX)
696 * If they've exceeded their filesize limit, tell them about it.
698 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
702 * If the offset we are starting the write at is beyond the end of
703 * the file, then they've done a seek. Unix filesystems allow
704 * files with holes in them, DOS doesn't so we must fill the hole
705 * with zeroed blocks.
707 if (uio->uio_offset > dep->de_FileSize) {
708 error = deextend(dep, uio->uio_offset, cred);
714 * Remember some values in case the write fails.
716 resid = uio->uio_resid;
717 osize = dep->de_FileSize;
720 * If we write beyond the end of the file, extend it to its ultimate
721 * size ahead of the time to hopefully get a contiguous area.
723 if (uio->uio_offset + resid > osize) {
724 count = de_clcount(pmp, uio->uio_offset + resid) -
725 de_clcount(pmp, osize);
726 error = extendfile(dep, count, NULL, NULL, 0);
727 if (error && (error != ENOSPC || (ioflag & IO_UNIT)))
729 lastcn = dep->de_fc[FC_LASTFC].fc_frcn;
731 lastcn = de_clcount(pmp, osize) - 1;
733 seqcount = ioflag >> IO_SEQSHIFT;
735 if (de_cluster(pmp, uio->uio_offset) > lastcn) {
740 croffset = uio->uio_offset & pmp->pm_crbomask;
741 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset);
742 if (uio->uio_offset + n > dep->de_FileSize) {
743 dep->de_FileSize = uio->uio_offset + n;
744 /* The object size needs to be set before buffer is allocated */
745 vnode_pager_setsize(vp, dep->de_FileSize);
748 bn = de_cluster(pmp, uio->uio_offset);
749 if ((uio->uio_offset & pmp->pm_crbomask) == 0
750 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid)
751 > de_cluster(pmp, uio->uio_offset)
752 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) {
754 * If either the whole cluster gets written,
755 * or we write the cluster from its start beyond EOF,
756 * then no need to read data from disk.
758 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0);
761 * Do the bmap now, since pcbmap needs buffers
762 * for the fat table. (see msdosfs_strategy)
764 if (bp->b_blkno == bp->b_lblkno) {
765 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0);
771 if (bp->b_blkno == -1) {
774 error = EIO; /* XXX */
779 * The block we need to write into exists, so read it in.
781 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp);
789 * Should these vnode_pager_* functions be done on dir
794 * Copy the data from user space into the buf header.
796 error = uiomove(bp->b_data + croffset, n, uio);
802 /* Prepare for clustered writes in some else clauses. */
803 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
804 bp->b_flags |= B_CLUSTEROK;
807 * If IO_SYNC, then each buffer is written synchronously.
808 * Otherwise, if we have a severe page deficiency then
809 * write the buffer asynchronously. Otherwise, if on a
810 * cluster boundary then write the buffer asynchronously,
811 * combining it with contiguous clusters if permitted and
812 * possible, since we don't expect more writes into this
813 * buffer soon. Otherwise, do a delayed write because we
814 * expect more writes into this buffer soon.
816 if (ioflag & IO_SYNC)
818 else if (vm_page_count_severe() || buf_dirty_count_severe())
820 else if (n + croffset == pmp->pm_bpcluster) {
821 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
822 cluster_write(vp, bp, dep->de_FileSize,
828 dep->de_flag |= DE_UPDATE;
829 } while (error == 0 && uio->uio_resid > 0);
832 * If the write failed and they want us to, truncate the file back
833 * to the size it was before the write was attempted.
837 if (ioflag & IO_UNIT) {
838 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL);
839 uio->uio_offset -= resid - uio->uio_resid;
840 uio->uio_resid = resid;
842 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL);
843 if (uio->uio_resid != resid)
846 } else if (ioflag & IO_SYNC)
847 error = deupdat(dep, 1);
852 * Flush the blocks of a file to disk.
856 struct vop_fsync_args /* {
858 struct ucred *a_cred;
869 * If the syncing request comes from fsync(2), sync the entire
870 * FAT and any other metadata that happens to be on devvp. We
871 * need this mainly for the FAT. We write the FAT sloppily, and
872 * syncing it all now is the best we can easily do to get all
873 * directory entries associated with the file (not just the file)
874 * fully synced. The other metadata includes critical metadata
875 * for all directory entries, but only in the MNT_ASYNC case. We
876 * will soon sync all metadata in the file's directory entry.
877 * Non-critical metadata for associated directory entries only
878 * gets synced accidentally, as in most file systems.
880 if (ap->a_waitfor == MNT_WAIT) {
881 devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp;
882 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
883 allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td);
884 VOP_UNLOCK(devvp, 0);
888 error = deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT);
896 struct vop_remove_args /* {
899 struct componentname *a_cnp;
902 struct denode *dep = VTODE(ap->a_vp);
903 struct denode *ddep = VTODE(ap->a_dvp);
906 if (ap->a_vp->v_type == VDIR)
909 error = removede(ddep, dep);
911 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount);
917 * DOS filesystems don't know what links are.
921 struct vop_link_args /* {
922 struct vnode *a_tdvp;
924 struct componentname *a_cnp;
931 * Renames on files require moving the denode to a new hash queue since the
932 * denode's location is used to compute which hash queue to put the file
933 * in. Unless it is a rename in place. For example "mv a b".
935 * What follows is the basic algorithm:
938 * if (dest file exists) {
941 * if (dest and src in same directory) {
942 * rewrite name in existing directory slot
944 * write new entry in dest directory
945 * update offset and dirclust in denode
946 * move denode to new hash chain
947 * clear old directory entry
951 * if (dest directory exists) {
952 * if (dest is not empty) {
955 * remove dest directory
957 * if (dest and src in same directory) {
958 * rewrite name in existing entry
960 * be sure dest is not a child of src directory
961 * write entry in dest directory
962 * update "." and ".." in moved directory
963 * clear old directory entry for moved directory
968 * source's parent directory is unlocked
969 * source file or directory is unlocked
970 * destination's parent directory is locked
971 * destination file or directory is locked if it exists
974 * all denodes should be released
978 struct vop_rename_args /* {
979 struct vnode *a_fdvp;
981 struct componentname *a_fcnp;
982 struct vnode *a_tdvp;
984 struct componentname *a_tcnp;
987 struct vnode *tdvp = ap->a_tdvp;
988 struct vnode *fvp = ap->a_fvp;
989 struct vnode *fdvp = ap->a_fdvp;
990 struct vnode *tvp = ap->a_tvp;
991 struct componentname *tcnp = ap->a_tcnp;
992 struct componentname *fcnp = ap->a_fcnp;
993 struct denode *ip, *xp, *dp, *zp;
994 u_char toname[12], oldname[11];
995 u_long from_diroffset, to_diroffset;
997 int doingdirectory = 0, newparent = 0;
1001 struct denode *fddep; /* from file's parent directory */
1002 struct msdosfsmount *pmp;
1003 struct direntry *dotdotp;
1006 fddep = VTODE(ap->a_fdvp);
1007 pmp = fddep->de_pmp;
1009 pmp = VFSTOMSDOSFS(fdvp->v_mount);
1012 if ((tcnp->cn_flags & HASBUF) == 0 ||
1013 (fcnp->cn_flags & HASBUF) == 0)
1014 panic("msdosfs_rename: no name");
1017 * Check for cross-device rename.
1019 if (fvp->v_mount != tdvp->v_mount ||
1020 (tvp && fvp->v_mount != tvp->v_mount)) {
1035 * If source and dest are the same, do nothing.
1042 error = vn_lock(fvp, LK_EXCLUSIVE);
1049 * Be sure we are not renaming ".", "..", or an alias of ".". This
1050 * leads to a crippled directory tree. It's pretty tough to do a
1051 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
1052 * doesn't work if the ".." entry is missing.
1054 if (ip->de_Attributes & ATTR_DIRECTORY) {
1056 * Avoid ".", "..", and aliases of "." for obvious reasons.
1058 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
1060 (fcnp->cn_flags & ISDOTDOT) ||
1061 (tcnp->cn_flags & ISDOTDOT) ||
1062 (ip->de_flag & DE_RENAME)) {
1067 ip->de_flag |= DE_RENAME;
1072 * When the target exists, both the directory
1073 * and target vnodes are returned locked.
1076 xp = tvp ? VTODE(tvp) : NULL;
1078 * Remember direntry place to use for destination
1080 to_diroffset = dp->de_fndoffset;
1081 to_count = dp->de_fndcnt;
1084 * If ".." must be changed (ie the directory gets a new
1085 * parent) then the source directory must not be in the
1086 * directory hierarchy above the target, as this would
1087 * orphan everything below the source directory. Also
1088 * the user must have write permission in the source so
1089 * as to be able to change "..". We must repeat the call
1090 * to namei, as the parent directory is unlocked by the
1091 * call to doscheckpath().
1093 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
1095 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
1097 if (doingdirectory && newparent) {
1098 if (error) /* write access check above */
1103 * doscheckpath() vput()'s dp,
1104 * so we have to do a relookup afterwards
1106 error = doscheckpath(ip, dp);
1109 if ((tcnp->cn_flags & SAVESTART) == 0)
1110 panic("msdosfs_rename: lost to startdir");
1111 error = relookup(tdvp, &tvp, tcnp);
1115 xp = tvp ? VTODE(tvp) : NULL;
1120 * Target must be empty if a directory and have no links
1121 * to it. Also, ensure source and target are compatible
1122 * (both directories, or both not directories).
1124 if (xp->de_Attributes & ATTR_DIRECTORY) {
1125 if (!dosdirempty(xp)) {
1129 if (!doingdirectory) {
1134 } else if (doingdirectory) {
1138 error = removede(dp, xp);
1146 * Convert the filename in tcnp into a dos filename. We copy this
1147 * into the denode and directory entry for the destination
1150 error = uniqdosname(VTODE(tdvp), tcnp, toname);
1155 * Since from wasn't locked at various places above,
1156 * have to do a relookup here.
1158 fcnp->cn_flags &= ~MODMASK;
1159 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1160 if ((fcnp->cn_flags & SAVESTART) == 0)
1161 panic("msdosfs_rename: lost from startdir");
1163 VOP_UNLOCK(tdvp, 0);
1164 if (relookup(fdvp, &fvp, fcnp) == 0)
1168 * From name has disappeared.
1171 panic("rename: lost dir entry");
1173 VOP_UNLOCK(tdvp, 0);
1180 from_diroffset = zp->de_fndoffset;
1183 * Ensure that the directory entry still exists and has not
1184 * changed till now. If the source is a file the entry may
1185 * have been unlinked or renamed. In either case there is
1186 * no further work to be done. If the source is a directory
1187 * then it cannot have been rmdir'ed or renamed; this is
1188 * prohibited by the DE_RENAME flag.
1192 panic("rename: lost dir entry");
1195 VOP_UNLOCK(fdvp, 0);
1203 * First write a new entry in the destination
1204 * directory and mark the entry in the source directory
1205 * as deleted. Then move the denode to the correct hash
1206 * chain for its new location in the filesystem. And, if
1207 * we moved a directory, then update its .. entry to point
1208 * to the new parent directory.
1210 bcopy(ip->de_Name, oldname, 11);
1211 bcopy(toname, ip->de_Name, 11); /* update denode */
1212 dp->de_fndoffset = to_diroffset;
1213 dp->de_fndcnt = to_count;
1214 error = createde(ip, dp, (struct denode **)0, tcnp);
1216 bcopy(oldname, ip->de_Name, 11);
1218 VOP_UNLOCK(fdvp, 0);
1223 zp->de_fndoffset = from_diroffset;
1224 error = removede(zp, ip);
1226 /* XXX should downgrade to ro here, fs is corrupt */
1228 VOP_UNLOCK(fdvp, 0);
1232 if (!doingdirectory) {
1233 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0,
1234 &ip->de_dirclust, 0);
1236 /* XXX should downgrade to ro here, fs is corrupt */
1238 VOP_UNLOCK(fdvp, 0);
1242 if (ip->de_dirclust == MSDOSFSROOT)
1243 ip->de_diroffset = to_diroffset;
1245 ip->de_diroffset = to_diroffset & pmp->pm_crbomask;
1249 VOP_UNLOCK(fdvp, 0);
1253 * If we moved a directory to a new parent directory, then we must
1254 * fixup the ".." entry in the moved directory.
1256 if (doingdirectory && newparent) {
1257 cn = ip->de_StartCluster;
1258 if (cn == MSDOSFSROOT) {
1259 /* this should never happen */
1260 panic("msdosfs_rename(): updating .. in root directory?");
1262 bn = cntobn(pmp, cn);
1263 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
1266 /* XXX should downgrade to ro here, fs is corrupt */
1271 dotdotp = (struct direntry *)bp->b_data + 1;
1272 pcl = dp->de_StartCluster;
1273 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1275 putushort(dotdotp->deStartCluster, pcl);
1277 putushort(dotdotp->deHighClust, pcl >> 16);
1278 if (DOINGASYNC(fvp))
1280 else if ((error = bwrite(bp)) != 0) {
1281 /* XXX should downgrade to ro here, fs is corrupt */
1288 * The msdosfs lookup is case insensitive. Several aliases may
1289 * be inserted for a single directory entry. As a consequnce,
1290 * name cache purge done by lookup for fvp when DELETE op for
1291 * namei is specified, might be not enough to expunge all
1292 * namecache entries that were installed for this direntry.
1301 ip->de_flag &= ~DE_RENAME;
1309 struct direntry dot;
1310 struct direntry dotdot;
1311 } dosdirtemplate = {
1312 { ". ", /* the . entry */
1313 ATTR_DIRECTORY, /* file attribute */
1315 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1316 { 0, 0 }, /* access date */
1317 { 0, 0 }, /* high bits of start cluster */
1318 { 210, 4 }, { 210, 4 }, /* modify time & date */
1319 { 0, 0 }, /* startcluster */
1320 { 0, 0, 0, 0 } /* filesize */
1322 { ".. ", /* the .. entry */
1323 ATTR_DIRECTORY, /* file attribute */
1325 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1326 { 0, 0 }, /* access date */
1327 { 0, 0 }, /* high bits of start cluster */
1328 { 210, 4 }, { 210, 4 }, /* modify time & date */
1329 { 0, 0 }, /* startcluster */
1330 { 0, 0, 0, 0 } /* filesize */
1336 struct vop_mkdir_args /* {
1337 struct vnode *a_dvp;
1338 struct vnode **a_vpp;
1339 struvt componentname *a_cnp;
1340 struct vattr *a_vap;
1343 struct componentname *cnp = ap->a_cnp;
1345 struct denode *pdep = VTODE(ap->a_dvp);
1346 struct direntry *denp;
1347 struct msdosfsmount *pmp = pdep->de_pmp;
1349 u_long newcluster, pcl;
1352 struct denode ndirent;
1356 * If this is the root directory and there is no space left we
1357 * can't do anything. This is because the root directory can not
1360 if (pdep->de_StartCluster == MSDOSFSROOT
1361 && pdep->de_fndoffset >= pdep->de_FileSize) {
1367 * Allocate a cluster to hold the about to be created directory.
1369 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL);
1373 bzero(&ndirent, sizeof(ndirent));
1374 ndirent.de_pmp = pmp;
1375 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1377 DETIMES(&ndirent, &ts, &ts, &ts);
1380 * Now fill the cluster with the "." and ".." entries. And write
1381 * the cluster to disk. This way it is there for the parent
1382 * directory to be pointing at if there were a crash.
1384 bn = cntobn(pmp, newcluster);
1385 /* always succeeds */
1386 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0);
1387 bzero(bp->b_data, pmp->pm_bpcluster);
1388 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate);
1389 denp = (struct direntry *)bp->b_data;
1390 putushort(denp[0].deStartCluster, newcluster);
1391 putushort(denp[0].deCDate, ndirent.de_CDate);
1392 putushort(denp[0].deCTime, ndirent.de_CTime);
1393 denp[0].deCHundredth = ndirent.de_CHun;
1394 putushort(denp[0].deADate, ndirent.de_ADate);
1395 putushort(denp[0].deMDate, ndirent.de_MDate);
1396 putushort(denp[0].deMTime, ndirent.de_MTime);
1397 pcl = pdep->de_StartCluster;
1399 * Although the root directory has a non-magic starting cluster
1400 * number for FAT32, chkdsk and fsck_msdosfs still require
1401 * references to it in dotdot entries to be magic.
1403 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1405 putushort(denp[1].deStartCluster, pcl);
1406 putushort(denp[1].deCDate, ndirent.de_CDate);
1407 putushort(denp[1].deCTime, ndirent.de_CTime);
1408 denp[1].deCHundredth = ndirent.de_CHun;
1409 putushort(denp[1].deADate, ndirent.de_ADate);
1410 putushort(denp[1].deMDate, ndirent.de_MDate);
1411 putushort(denp[1].deMTime, ndirent.de_MTime);
1413 putushort(denp[0].deHighClust, newcluster >> 16);
1414 putushort(denp[1].deHighClust, pcl >> 16);
1417 if (DOINGASYNC(ap->a_dvp))
1419 else if ((error = bwrite(bp)) != 0)
1423 * Now build up a directory entry pointing to the newly allocated
1424 * cluster. This will be written to an empty slot in the parent
1428 if ((cnp->cn_flags & HASBUF) == 0)
1429 panic("msdosfs_mkdir: no name");
1431 error = uniqdosname(pdep, cnp, ndirent.de_Name);
1435 ndirent.de_Attributes = ATTR_DIRECTORY;
1436 ndirent.de_LowerCase = 0;
1437 ndirent.de_StartCluster = newcluster;
1438 ndirent.de_FileSize = 0;
1439 error = createde(&ndirent, pdep, &dep, cnp);
1442 *ap->a_vpp = DETOV(dep);
1446 clusterfree(pmp, newcluster, NULL);
1453 struct vop_rmdir_args /* {
1454 struct vnode *a_dvp;
1456 struct componentname *a_cnp;
1459 struct vnode *vp = ap->a_vp;
1460 struct vnode *dvp = ap->a_dvp;
1461 struct componentname *cnp = ap->a_cnp;
1462 struct denode *ip, *dp;
1463 struct thread *td = cnp->cn_thread;
1470 * Verify the directory is empty (and valid).
1471 * (Rmdir ".." won't be valid since
1472 * ".." will contain a reference to
1473 * the current directory and thus be
1477 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) {
1482 * Delete the entry from the directory. For dos filesystems this
1483 * gets rid of the directory entry on disk, the in memory copy
1484 * still exists but the de_refcnt is <= 0. This prevents it from
1485 * being found by deget(). When the vput() on dep is done we give
1486 * up access and eventually msdosfs_reclaim() will be called which
1487 * will remove it from the denode cache.
1489 error = removede(dp, ip);
1493 * This is where we decrement the link count in the parent
1494 * directory. Since dos filesystems don't do this we just purge
1499 * Truncate the directory that is being deleted.
1501 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, td);
1509 * DOS filesystems don't know what symlinks are.
1513 struct vop_symlink_args /* {
1514 struct vnode *a_dvp;
1515 struct vnode **a_vpp;
1516 struct componentname *a_cnp;
1517 struct vattr *a_vap;
1521 return (EOPNOTSUPP);
1526 struct vop_readdir_args /* {
1529 struct ucred *a_cred;
1547 struct denode *dep = VTODE(ap->a_vp);
1548 struct msdosfsmount *pmp = dep->de_pmp;
1549 struct direntry *dentp;
1550 struct dirent dirbuf;
1551 struct uio *uio = ap->a_uio;
1552 u_long *cookies = NULL;
1557 #ifdef MSDOSFS_DEBUG
1558 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
1559 ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
1563 * msdosfs_readdir() won't operate properly on regular files since
1564 * it does i/o only with the filesystem vnode, and hence can
1565 * retrieve the wrong block from the buffer cache for a plain file.
1566 * So, fail attempts to readdir() on a plain file.
1568 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
1572 * To be safe, initialize dirbuf
1574 bzero(dirbuf.d_name, sizeof(dirbuf.d_name));
1577 * If the user buffer is smaller than the size of one dos directory
1578 * entry or the file offset is not a multiple of the size of a
1579 * directory entry, then we fail the read.
1581 off = offset = uio->uio_offset;
1582 if (uio->uio_resid < sizeof(struct direntry) ||
1583 (offset & (sizeof(struct direntry) - 1)))
1586 if (ap->a_ncookies) {
1587 ncookies = uio->uio_resid / 16;
1588 cookies = malloc(ncookies * sizeof(u_long), M_TEMP,
1590 *ap->a_cookies = cookies;
1591 *ap->a_ncookies = ncookies;
1594 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1597 * If they are reading from the root directory then, we simulate
1598 * the . and .. entries since these don't exist in the root
1599 * directory. We also set the offset bias to make up for having to
1600 * simulate these entries. By this I mean that at file offset 64 we
1601 * read the first entry in the root directory that lives on disk.
1603 if (dep->de_StartCluster == MSDOSFSROOT
1604 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
1606 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n",
1609 bias = 2 * sizeof(struct direntry);
1610 if (offset < bias) {
1611 for (n = (int)offset / sizeof(struct direntry);
1614 fileno = (uint64_t)cntobn(pmp,
1619 if (pmp->pm_flags & MSDOSFS_LARGEFS) {
1621 msdosfs_fileno_map(pmp->pm_mountp,
1625 dirbuf.d_fileno = (uint32_t)fileno;
1627 dirbuf.d_type = DT_DIR;
1630 dirbuf.d_namlen = 1;
1631 strcpy(dirbuf.d_name, ".");
1634 dirbuf.d_namlen = 2;
1635 strcpy(dirbuf.d_name, "..");
1638 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1639 if (uio->uio_resid < dirbuf.d_reclen)
1641 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1644 offset += sizeof(struct direntry);
1647 *cookies++ = offset;
1648 if (--ncookies <= 0)
1657 while (uio->uio_resid > 0) {
1658 lbn = de_cluster(pmp, offset - bias);
1659 on = (offset - bias) & pmp->pm_crbomask;
1660 n = min(pmp->pm_bpcluster - on, uio->uio_resid);
1661 diff = dep->de_FileSize - (offset - bias);
1665 error = pcbmap(dep, lbn, &bn, &cn, &blsize);
1668 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp);
1673 n = min(n, blsize - bp->b_resid);
1680 * Convert from dos directory entries to fs-independent
1681 * directory entries.
1683 for (dentp = (struct direntry *)(bp->b_data + on);
1684 (char *)dentp < bp->b_data + on + n;
1685 dentp++, offset += sizeof(struct direntry)) {
1687 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
1688 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
1691 * If this is an unused entry, we can stop.
1693 if (dentp->deName[0] == SLOT_EMPTY) {
1698 * Skip deleted entries.
1700 if (dentp->deName[0] == SLOT_DELETED) {
1707 * Handle Win95 long directory entries
1709 if (dentp->deAttributes == ATTR_WIN95) {
1710 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
1712 chksum = win2unixfn(&nb,
1713 (struct winentry *)dentp, chksum, pmp);
1718 * Skip volume labels
1720 if (dentp->deAttributes & ATTR_VOLUME) {
1726 * This computation of d_fileno must match
1727 * the computation of va_fileid in
1730 if (dentp->deAttributes & ATTR_DIRECTORY) {
1731 fileno = getushort(dentp->deStartCluster);
1733 fileno |= getushort(dentp->deHighClust) << 16;
1734 /* if this is the root directory */
1735 if (fileno == MSDOSFSROOT)
1737 fileno = (uint64_t)cntobn(pmp,
1743 fileno = (uint64_t)cntobn(pmp, fileno) *
1745 dirbuf.d_type = DT_DIR;
1747 fileno = (uoff_t)offset /
1748 sizeof(struct direntry);
1749 dirbuf.d_type = DT_REG;
1751 if (pmp->pm_flags & MSDOSFS_LARGEFS) {
1753 msdosfs_fileno_map(pmp->pm_mountp, fileno);
1755 dirbuf.d_fileno = (uint32_t)fileno;
1757 if (chksum != winChksum(dentp->deName)) {
1758 dirbuf.d_namlen = dos2unixfn(dentp->deName,
1759 (u_char *)dirbuf.d_name,
1760 dentp->deLowerCase |
1761 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ?
1762 (LCASE_BASE | LCASE_EXT) : 0),
1766 mbnambuf_flush(&nb, &dirbuf);
1768 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1769 if (uio->uio_resid < dirbuf.d_reclen) {
1773 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1779 *cookies++ = offset + sizeof(struct direntry);
1780 if (--ncookies <= 0) {
1785 off = offset + sizeof(struct direntry);
1790 /* Subtract unused cookies */
1792 *ap->a_ncookies -= ncookies;
1794 uio->uio_offset = off;
1797 * Set the eofflag (NFS uses it)
1799 if (ap->a_eofflag) {
1800 if (dep->de_FileSize - (offset - bias) <= 0)
1809 * a_vp - pointer to the file's vnode
1810 * a_bn - logical block number within the file (cluster number for us)
1811 * a_bop - where to return the bufobj of the special file containing the fs
1812 * a_bnp - where to return the "physical" block number corresponding to a_bn
1813 * (relative to the special file; units are blocks of size DEV_BSIZE)
1814 * a_runp - where to return the "run past" a_bn. This is the count of logical
1815 * blocks whose physical blocks (together with a_bn's physical block)
1817 * a_runb - where to return the "run before" a_bn.
1821 struct vop_bmap_args /* {
1824 struct bufobj **a_bop;
1832 struct msdosfsmount *pmp;
1836 int bnpercn, error, maxio, maxrun, run;
1841 if (ap->a_bop != NULL)
1842 *ap->a_bop = &pmp->pm_devvp->v_bufobj;
1843 if (ap->a_bnp == NULL)
1845 if (ap->a_runp != NULL)
1847 if (ap->a_runb != NULL)
1852 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL);
1853 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL))
1857 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize;
1858 bnpercn = de_cn2bn(pmp, 1);
1859 if (ap->a_runp != NULL) {
1860 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn);
1861 for (run = 1; run <= maxrun; run++) {
1862 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 ||
1863 runbn != *ap->a_bnp + run * bnpercn)
1866 *ap->a_runp = run - 1;
1868 if (ap->a_runb != NULL) {
1869 maxrun = ulmin(maxio - 1, cn);
1870 for (run = 1; run < maxrun; run++) {
1871 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 ||
1872 runbn != *ap->a_bnp - run * bnpercn)
1875 *ap->a_runb = run - 1;
1881 msdosfs_strategy(ap)
1882 struct vop_strategy_args /* {
1887 struct buf *bp = ap->a_bp;
1888 struct denode *dep = VTODE(ap->a_vp);
1894 * If we don't already know the filesystem relative block number
1895 * then get it using pcbmap(). If pcbmap() returns the block
1896 * number as -1 then we've got a hole in the file. DOS filesystems
1897 * don't allow files with holes, so we shouldn't ever see this.
1899 if (bp->b_blkno == bp->b_lblkno) {
1900 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0);
1901 bp->b_blkno = blkno;
1903 bp->b_error = error;
1904 bp->b_ioflags |= BIO_ERROR;
1908 if ((long)bp->b_blkno == -1)
1911 if (bp->b_blkno == -1) {
1916 * Read/write the block from/to the disk that contains the desired
1919 bp->b_iooffset = dbtob(bp->b_blkno);
1920 bo = dep->de_pmp->pm_bo;
1921 BO_STRATEGY(bo, bp);
1927 struct vop_print_args /* {
1931 struct denode *dep = VTODE(ap->a_vp);
1933 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ",
1934 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
1935 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev));
1940 msdosfs_pathconf(ap)
1941 struct vop_pathconf_args /* {
1947 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp;
1949 switch (ap->a_name) {
1954 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12;
1957 *ap->a_retval = PATH_MAX;
1959 case _PC_CHOWN_RESTRICTED:
1973 struct vop_vptofh_args /* {
1979 struct defid *defhp;
1981 dep = VTODE(ap->a_vp);
1982 defhp = (struct defid *)ap->a_fhp;
1983 defhp->defid_len = sizeof(struct defid);
1984 defhp->defid_dirclust = dep->de_dirclust;
1985 defhp->defid_dirofs = dep->de_diroffset;
1986 /* defhp->defid_gen = dep->de_gen; */
1990 /* Global vfs data structures for msdosfs */
1991 struct vop_vector msdosfs_vnodeops = {
1992 .vop_default = &default_vnodeops,
1994 .vop_access = msdosfs_access,
1995 .vop_bmap = msdosfs_bmap,
1996 .vop_cachedlookup = msdosfs_lookup,
1997 .vop_open = msdosfs_open,
1998 .vop_close = msdosfs_close,
1999 .vop_create = msdosfs_create,
2000 .vop_fsync = msdosfs_fsync,
2001 .vop_getattr = msdosfs_getattr,
2002 .vop_inactive = msdosfs_inactive,
2003 .vop_link = msdosfs_link,
2004 .vop_lookup = vfs_cache_lookup,
2005 .vop_mkdir = msdosfs_mkdir,
2006 .vop_mknod = msdosfs_mknod,
2007 .vop_pathconf = msdosfs_pathconf,
2008 .vop_print = msdosfs_print,
2009 .vop_read = msdosfs_read,
2010 .vop_readdir = msdosfs_readdir,
2011 .vop_reclaim = msdosfs_reclaim,
2012 .vop_remove = msdosfs_remove,
2013 .vop_rename = msdosfs_rename,
2014 .vop_rmdir = msdosfs_rmdir,
2015 .vop_setattr = msdosfs_setattr,
2016 .vop_strategy = msdosfs_strategy,
2017 .vop_symlink = msdosfs_symlink,
2018 .vop_write = msdosfs_write,
2019 .vop_vptofh = msdosfs_vptofh,