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>
54 #include <sys/lockf.h>
55 #include <sys/mutex.h>
56 #include <sys/namei.h>
57 #include <sys/resourcevar.h> /* defines plimit structure in proc struct */
60 #include <sys/clock.h>
64 #include <sys/mount.h>
65 #include <sys/unistd.h>
66 #include <sys/vnode.h>
67 #include <sys/malloc.h>
68 #include <sys/dirent.h>
69 #include <sys/signalvar.h>
72 #include <vm/vm_extern.h>
74 #include <fs/msdosfs/bpb.h>
75 #include <fs/msdosfs/msdosfsmount.h>
76 #include <fs/msdosfs/direntry.h>
77 #include <fs/msdosfs/denode.h>
78 #include <fs/msdosfs/fat.h>
80 #define DOS_FILESIZE_MAX 0xffffffff
83 * Prototypes for MSDOSFS vnode operations
85 static vop_advlock_t msdosfs_advlock;
86 static vop_create_t msdosfs_create;
87 static vop_mknod_t msdosfs_mknod;
88 static vop_open_t msdosfs_open;
89 static vop_close_t msdosfs_close;
90 static vop_access_t msdosfs_access;
91 static vop_getattr_t msdosfs_getattr;
92 static vop_setattr_t msdosfs_setattr;
93 static vop_read_t msdosfs_read;
94 static vop_write_t msdosfs_write;
95 static vop_fsync_t msdosfs_fsync;
96 static vop_remove_t msdosfs_remove;
97 static vop_link_t msdosfs_link;
98 static vop_rename_t msdosfs_rename;
99 static vop_mkdir_t msdosfs_mkdir;
100 static vop_rmdir_t msdosfs_rmdir;
101 static vop_symlink_t msdosfs_symlink;
102 static vop_readdir_t msdosfs_readdir;
103 static vop_bmap_t msdosfs_bmap;
104 static vop_strategy_t msdosfs_strategy;
105 static vop_print_t msdosfs_print;
106 static vop_pathconf_t msdosfs_pathconf;
107 static vop_vptofh_t msdosfs_vptofh;
110 * Some general notes:
112 * In the ufs filesystem the inodes, superblocks, and indirect blocks are
113 * read/written using the vnode for the filesystem. Blocks that represent
114 * the contents of a file are read/written using the vnode for the file
115 * (including directories when they are read/written as files). This
116 * presents problems for the dos filesystem because data that should be in
117 * an inode (if dos had them) resides in the directory itself. Since we
118 * must update directory entries without the benefit of having the vnode
119 * for the directory we must use the vnode for the filesystem. This means
120 * that when a directory is actually read/written (via read, write, or
121 * readdir, or seek) we must use the vnode for the filesystem instead of
122 * the vnode for the directory as would happen in ufs. This is to insure we
123 * retreive the correct block from the buffer cache since the hash value is
124 * based upon the vnode address and the desired block number.
128 * Create a regular file. On entry the directory to contain the file being
129 * created is locked. We must release before we return. We must also free
130 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or
131 * only if the SAVESTART bit in cn_flags is clear on success.
135 struct vop_create_args /* {
137 struct vnode **a_vpp;
138 struct componentname *a_cnp;
142 struct componentname *cnp = ap->a_cnp;
143 struct denode ndirent;
145 struct denode *pdep = VTODE(ap->a_dvp);
150 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap);
154 * If this is the root directory and there is no space left we
155 * can't do anything. This is because the root directory can not
158 if (pdep->de_StartCluster == MSDOSFSROOT
159 && pdep->de_fndoffset >= pdep->de_FileSize) {
165 * Create a directory entry for the file, then call createde() to
166 * have it installed. NOTE: DOS files are always executable. We
167 * use the absence of the owner write bit to make the file
171 if ((cnp->cn_flags & HASBUF) == 0)
172 panic("msdosfs_create: no name");
174 bzero(&ndirent, sizeof(ndirent));
175 error = uniqdosname(pdep, cnp, ndirent.de_Name);
179 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ?
180 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY;
181 ndirent.de_LowerCase = 0;
182 ndirent.de_StartCluster = 0;
183 ndirent.de_FileSize = 0;
184 ndirent.de_dev = pdep->de_dev;
185 ndirent.de_pmp = pdep->de_pmp;
186 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
188 DETIMES(&ndirent, &ts, &ts, &ts);
189 error = createde(&ndirent, pdep, &dep, cnp);
192 *ap->a_vpp = DETOV(dep);
201 struct vop_mknod_args /* {
203 struct vnode **a_vpp;
204 struct componentname *a_cnp;
213 struct vop_open_args /* {
216 struct ucred *a_cred;
221 struct denode *dep = VTODE(ap->a_vp);
222 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td);
228 struct vop_close_args /* {
231 struct ucred *a_cred;
235 struct vnode *vp = ap->a_vp;
236 struct denode *dep = VTODE(vp);
240 if (vp->v_usecount > 1) {
242 DETIMES(dep, &ts, &ts, &ts);
250 struct vop_access_args /* {
253 struct ucred *a_cred;
257 struct vnode *vp = ap->a_vp;
258 struct denode *dep = VTODE(ap->a_vp);
259 struct msdosfsmount *pmp = dep->de_pmp;
260 mode_t file_mode, mode = ap->a_mode;
262 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) |
263 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH));
264 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
267 * Disallow write attempts on read-only filesystems;
268 * unless the file is a socket, fifo, or a block or
269 * character device resident on the filesystem.
272 switch (vp->v_type) {
276 if (vp->v_mount->mnt_flag & MNT_RDONLY)
284 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid,
285 ap->a_mode, ap->a_cred, NULL));
290 struct vop_getattr_args /* {
293 struct ucred *a_cred;
297 struct denode *dep = VTODE(ap->a_vp);
298 struct msdosfsmount *pmp = dep->de_pmp;
299 struct vattr *vap = ap->a_vap;
302 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
306 DETIMES(dep, &ts, &ts, &ts);
307 vap->va_fsid = dev2udev(dep->de_dev);
309 * The following computation of the fileid must be the same as that
310 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
313 if (dep->de_Attributes & ATTR_DIRECTORY) {
314 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) *
316 if (dep->de_StartCluster == MSDOSFSROOT)
319 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) *
321 if (dep->de_dirclust == MSDOSFSROOT)
322 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk;
323 fileid += (uint64_t)dep->de_diroffset / sizeof(struct direntry);
326 if (pmp->pm_flags & MSDOSFS_LARGEFS)
327 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid);
329 vap->va_fileid = (long)fileid;
331 if ((dep->de_Attributes & ATTR_READONLY) == 0)
332 mode = S_IRWXU|S_IRWXG|S_IRWXO;
334 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
335 vap->va_mode = mode &
336 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
337 vap->va_uid = pmp->pm_uid;
338 vap->va_gid = pmp->pm_gid;
341 vap->va_size = dep->de_FileSize;
342 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime);
343 vap->va_ctime = vap->va_mtime;
344 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
345 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime);
346 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun,
347 0, &vap->va_birthtime);
349 vap->va_atime = vap->va_mtime;
350 vap->va_birthtime.tv_sec = -1;
351 vap->va_birthtime.tv_nsec = 0;
354 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0)
355 vap->va_flags |= SF_ARCHIVED;
357 vap->va_blocksize = pmp->pm_bpcluster;
359 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
360 vap->va_type = ap->a_vp->v_type;
361 vap->va_filerev = dep->de_modrev;
367 struct vop_setattr_args /* {
370 struct ucred *a_cred;
374 struct vnode *vp = ap->a_vp;
375 struct denode *dep = VTODE(ap->a_vp);
376 struct msdosfsmount *pmp = dep->de_pmp;
377 struct vattr *vap = ap->a_vap;
378 struct ucred *cred = ap->a_cred;
382 printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n",
383 ap->a_vp, vap, cred, ap->a_td);
387 * Check for unsettable attributes.
389 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
390 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
391 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
392 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
394 printf("msdosfs_setattr(): returning EINVAL\n");
395 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n",
396 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid);
397 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n",
398 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen);
399 printf(" va_uid %x, va_gid %x\n",
400 vap->va_uid, vap->va_gid);
404 if (vap->va_flags != VNOVAL) {
405 if (vp->v_mount->mnt_flag & MNT_RDONLY)
407 if (cred->cr_uid != pmp->pm_uid) {
408 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
413 * We are very inconsistent about handling unsupported
414 * attributes. We ignored the access time and the
415 * read and execute bits. We were strict for the other
418 * Here we are strict, stricter than ufs in not allowing
419 * users to attempt to set SF_SETTABLE bits or anyone to
420 * set unsupported bits. However, we ignore attempts to
421 * set ATTR_ARCHIVE for directories `cp -pr' from a more
422 * sensible filesystem attempts it a lot.
424 if (vap->va_flags & SF_SETTABLE) {
425 error = priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0);
429 if (vap->va_flags & ~SF_ARCHIVED)
431 if (vap->va_flags & SF_ARCHIVED)
432 dep->de_Attributes &= ~ATTR_ARCHIVE;
433 else if (!(dep->de_Attributes & ATTR_DIRECTORY))
434 dep->de_Attributes |= ATTR_ARCHIVE;
435 dep->de_flag |= DE_MODIFIED;
438 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
442 if (vp->v_mount->mnt_flag & MNT_RDONLY)
445 if (uid == (uid_t)VNOVAL)
448 if (gid == (gid_t)VNOVAL)
450 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid ||
451 (gid != pmp->pm_gid && !groupmember(gid, cred))) {
452 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
456 if (uid != pmp->pm_uid || gid != pmp->pm_gid)
460 if (vap->va_size != VNOVAL) {
462 * Disallow write attempts on read-only filesystems;
463 * unless the file is a socket, fifo, or a block or
464 * character device resident on the filesystem.
466 switch (vp->v_type) {
472 if (vp->v_mount->mnt_flag & MNT_RDONLY)
478 error = detrunc(dep, vap->va_size, 0, cred, ap->a_td);
482 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
483 if (vp->v_mount->mnt_flag & MNT_RDONLY)
485 if (vap->va_vaflags & VA_UTIMES_NULL) {
486 error = VOP_ACCESS(vp, VADMIN, cred, ap->a_td);
488 error = VOP_ACCESS(vp, VWRITE, cred,
491 error = VOP_ACCESS(vp, VADMIN, cred, ap->a_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, 1));
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;
560 if (uio->uio_offset < 0)
563 if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX)
566 * If they didn't ask for any data, then we are done.
568 orig_resid = uio->uio_resid;
572 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
574 isadir = dep->de_Attributes & ATTR_DIRECTORY;
576 if (uio->uio_offset >= dep->de_FileSize)
578 lbn = de_cluster(pmp, uio->uio_offset);
580 blsize = pmp->pm_bpcluster;
581 on = uio->uio_offset & pmp->pm_crbomask;
583 * If we are operating on a directory file then be sure to
584 * do i/o with the vnode for the filesystem instead of the
585 * vnode for the directory.
588 /* convert cluster # to block # */
589 error = pcbmap(dep, lbn, &lbn, 0, &blsize);
590 if (error == E2BIG) {
595 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp);
596 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) {
597 error = bread(vp, lbn, blsize, NOCRED, &bp);
598 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
599 error = cluster_read(vp, dep->de_FileSize, lbn, blsize,
600 NOCRED, on + uio->uio_resid, seqcount, &bp);
601 } else if (seqcount > 1) {
603 error = breadn(vp, lbn,
604 blsize, &rablock, &rasize, 1, NOCRED, &bp);
606 error = bread(vp, lbn, blsize, NOCRED, &bp);
612 diff = pmp->pm_bpcluster - on;
613 n = diff > uio->uio_resid ? uio->uio_resid : diff;
614 diff = dep->de_FileSize - uio->uio_offset;
617 diff = blsize - bp->b_resid;
620 error = uiomove(bp->b_data + on, (int) n, uio);
622 } while (error == 0 && uio->uio_resid > 0 && n != 0);
623 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) &&
624 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
625 dep->de_flag |= DE_ACCESS;
630 * Write data to a file or directory.
634 struct vop_write_args /* {
638 struct ucred *a_cred;
650 int ioflag = ap->a_ioflag;
651 struct uio *uio = ap->a_uio;
652 struct thread *td = uio->uio_td;
653 struct vnode *vp = ap->a_vp;
654 struct vnode *thisvp;
655 struct denode *dep = VTODE(vp);
656 struct msdosfsmount *pmp = dep->de_pmp;
657 struct ucred *cred = ap->a_cred;
660 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
661 vp, uio, ioflag, cred);
662 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
663 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
666 switch (vp->v_type) {
668 if (ioflag & IO_APPEND)
669 uio->uio_offset = dep->de_FileSize;
675 panic("msdosfs_write(): bad file type");
678 if (uio->uio_offset < 0)
681 if (uio->uio_resid == 0)
685 * If they've exceeded their filesize limit, tell them about it.
688 PROC_LOCK(td->td_proc);
689 if ((uoff_t)uio->uio_offset + uio->uio_resid >
690 lim_cur(td->td_proc, RLIMIT_FSIZE)) {
691 psignal(td->td_proc, SIGXFSZ);
692 PROC_UNLOCK(td->td_proc);
695 PROC_UNLOCK(td->td_proc);
698 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX)
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.
854 * This function is worthless for vnodes that represent directories. Maybe we
855 * could just do a sync if they try an fsync on a directory file.
859 struct vop_fsync_args /* {
861 struct ucred *a_cred;
867 * Flush our dirty buffers.
871 return (deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT));
876 struct vop_remove_args /* {
879 struct componentname *a_cnp;
882 struct denode *dep = VTODE(ap->a_vp);
883 struct denode *ddep = VTODE(ap->a_dvp);
886 if (ap->a_vp->v_type == VDIR)
889 error = removede(ddep, dep);
891 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount);
897 * DOS filesystems don't know what links are.
901 struct vop_link_args /* {
902 struct vnode *a_tdvp;
904 struct componentname *a_cnp;
911 * Renames on files require moving the denode to a new hash queue since the
912 * denode's location is used to compute which hash queue to put the file
913 * in. Unless it is a rename in place. For example "mv a b".
915 * What follows is the basic algorithm:
918 * if (dest file exists) {
921 * if (dest and src in same directory) {
922 * rewrite name in existing directory slot
924 * write new entry in dest directory
925 * update offset and dirclust in denode
926 * move denode to new hash chain
927 * clear old directory entry
931 * if (dest directory exists) {
932 * if (dest is not empty) {
935 * remove dest directory
937 * if (dest and src in same directory) {
938 * rewrite name in existing entry
940 * be sure dest is not a child of src directory
941 * write entry in dest directory
942 * update "." and ".." in moved directory
943 * clear old directory entry for moved directory
948 * source's parent directory is unlocked
949 * source file or directory is unlocked
950 * destination's parent directory is locked
951 * destination file or directory is locked if it exists
954 * all denodes should be released
958 struct vop_rename_args /* {
959 struct vnode *a_fdvp;
961 struct componentname *a_fcnp;
962 struct vnode *a_tdvp;
964 struct componentname *a_tcnp;
967 struct vnode *tdvp = ap->a_tdvp;
968 struct vnode *fvp = ap->a_fvp;
969 struct vnode *fdvp = ap->a_fdvp;
970 struct vnode *tvp = ap->a_tvp;
971 struct componentname *tcnp = ap->a_tcnp;
972 struct componentname *fcnp = ap->a_fcnp;
973 struct thread *td = fcnp->cn_thread;
974 struct denode *ip, *xp, *dp, *zp;
975 u_char toname[11], oldname[11];
976 u_long from_diroffset, to_diroffset;
978 int doingdirectory = 0, newparent = 0;
982 struct denode *fddep; /* from file's parent directory */
983 struct msdosfsmount *pmp;
984 struct direntry *dotdotp;
987 fddep = VTODE(ap->a_fdvp);
990 pmp = VFSTOMSDOSFS(fdvp->v_mount);
993 if ((tcnp->cn_flags & HASBUF) == 0 ||
994 (fcnp->cn_flags & HASBUF) == 0)
995 panic("msdosfs_rename: no name");
998 * Check for cross-device rename.
1000 if ((fvp->v_mount != tdvp->v_mount) ||
1001 (tvp && (fvp->v_mount != tvp->v_mount))) {
1016 * If source and dest are the same, do nothing.
1023 error = vn_lock(fvp, LK_EXCLUSIVE, td);
1030 * Be sure we are not renaming ".", "..", or an alias of ".". This
1031 * leads to a crippled directory tree. It's pretty tough to do a
1032 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
1033 * doesn't work if the ".." entry is missing.
1035 if (ip->de_Attributes & ATTR_DIRECTORY) {
1037 * Avoid ".", "..", and aliases of "." for obvious reasons.
1039 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
1041 (fcnp->cn_flags & ISDOTDOT) ||
1042 (tcnp->cn_flags & ISDOTDOT) ||
1043 (ip->de_flag & DE_RENAME)) {
1044 VOP_UNLOCK(fvp, 0, td);
1048 ip->de_flag |= DE_RENAME;
1053 * When the target exists, both the directory
1054 * and target vnodes are returned locked.
1057 xp = tvp ? VTODE(tvp) : NULL;
1059 * Remember direntry place to use for destination
1061 to_diroffset = dp->de_fndoffset;
1062 to_count = dp->de_fndcnt;
1065 * If ".." must be changed (ie the directory gets a new
1066 * parent) then the source directory must not be in the
1067 * directory heirarchy above the target, as this would
1068 * orphan everything below the source directory. Also
1069 * the user must have write permission in the source so
1070 * as to be able to change "..". We must repeat the call
1071 * to namei, as the parent directory is unlocked by the
1072 * call to doscheckpath().
1074 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
1075 VOP_UNLOCK(fvp, 0, td);
1076 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
1078 if (doingdirectory && newparent) {
1079 if (error) /* write access check above */
1084 * doscheckpath() vput()'s dp,
1085 * so we have to do a relookup afterwards
1087 error = doscheckpath(ip, dp);
1090 if ((tcnp->cn_flags & SAVESTART) == 0)
1091 panic("msdosfs_rename: lost to startdir");
1092 error = relookup(tdvp, &tvp, tcnp);
1096 xp = tvp ? VTODE(tvp) : NULL;
1101 * Target must be empty if a directory and have no links
1102 * to it. Also, ensure source and target are compatible
1103 * (both directories, or both not directories).
1105 if (xp->de_Attributes & ATTR_DIRECTORY) {
1106 if (!dosdirempty(xp)) {
1110 if (!doingdirectory) {
1115 } else if (doingdirectory) {
1119 error = removede(dp, xp);
1127 * Convert the filename in tcnp into a dos filename. We copy this
1128 * into the denode and directory entry for the destination
1131 error = uniqdosname(VTODE(tdvp), tcnp, toname);
1136 * Since from wasn't locked at various places above,
1137 * have to do a relookup here.
1139 fcnp->cn_flags &= ~MODMASK;
1140 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1141 if ((fcnp->cn_flags & SAVESTART) == 0)
1142 panic("msdosfs_rename: lost from startdir");
1144 VOP_UNLOCK(tdvp, 0, td);
1145 if (relookup(fdvp, &fvp, fcnp) == 0)
1149 * From name has disappeared.
1152 panic("rename: lost dir entry");
1154 VOP_UNLOCK(tdvp, 0, td);
1161 from_diroffset = zp->de_fndoffset;
1164 * Ensure that the directory entry still exists and has not
1165 * changed till now. If the source is a file the entry may
1166 * have been unlinked or renamed. In either case there is
1167 * no further work to be done. If the source is a directory
1168 * then it cannot have been rmdir'ed or renamed; this is
1169 * prohibited by the DE_RENAME flag.
1173 panic("rename: lost dir entry");
1174 VOP_UNLOCK(fvp, 0, td);
1176 VOP_UNLOCK(fdvp, 0, td);
1184 * First write a new entry in the destination
1185 * directory and mark the entry in the source directory
1186 * as deleted. Then move the denode to the correct hash
1187 * chain for its new location in the filesystem. And, if
1188 * we moved a directory, then update its .. entry to point
1189 * to the new parent directory.
1191 bcopy(ip->de_Name, oldname, 11);
1192 bcopy(toname, ip->de_Name, 11); /* update denode */
1193 dp->de_fndoffset = to_diroffset;
1194 dp->de_fndcnt = to_count;
1195 error = createde(ip, dp, (struct denode **)0, tcnp);
1197 bcopy(oldname, ip->de_Name, 11);
1199 VOP_UNLOCK(fdvp, 0, td);
1200 VOP_UNLOCK(fvp, 0, td);
1204 zp->de_fndoffset = from_diroffset;
1205 error = removede(zp, ip);
1207 /* XXX should downgrade to ro here, fs is corrupt */
1209 VOP_UNLOCK(fdvp, 0, td);
1210 VOP_UNLOCK(fvp, 0, td);
1213 if (!doingdirectory) {
1214 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0,
1215 &ip->de_dirclust, 0);
1217 /* XXX should downgrade to ro here, fs is corrupt */
1219 VOP_UNLOCK(fdvp, 0, td);
1220 VOP_UNLOCK(fvp, 0, td);
1223 if (ip->de_dirclust == MSDOSFSROOT)
1224 ip->de_diroffset = to_diroffset;
1226 ip->de_diroffset = to_diroffset & pmp->pm_crbomask;
1230 VOP_UNLOCK(fdvp, 0, td);
1234 * If we moved a directory to a new parent directory, then we must
1235 * fixup the ".." entry in the moved directory.
1237 if (doingdirectory && newparent) {
1238 cn = ip->de_StartCluster;
1239 if (cn == MSDOSFSROOT) {
1240 /* this should never happen */
1241 panic("msdosfs_rename(): updating .. in root directory?");
1243 bn = cntobn(pmp, cn);
1244 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
1247 /* XXX should downgrade to ro here, fs is corrupt */
1249 VOP_UNLOCK(fvp, 0, td);
1252 dotdotp = (struct direntry *)bp->b_data + 1;
1253 putushort(dotdotp->deStartCluster, dp->de_StartCluster);
1255 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16);
1258 /* XXX should downgrade to ro here, fs is corrupt */
1259 VOP_UNLOCK(fvp, 0, td);
1264 VOP_UNLOCK(fvp, 0, td);
1270 ip->de_flag &= ~DE_RENAME;
1278 struct direntry dot;
1279 struct direntry dotdot;
1280 } dosdirtemplate = {
1281 { ". ", " ", /* the . entry */
1282 ATTR_DIRECTORY, /* file attribute */
1284 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1285 { 0, 0 }, /* access date */
1286 { 0, 0 }, /* high bits of start cluster */
1287 { 210, 4 }, { 210, 4 }, /* modify time & date */
1288 { 0, 0 }, /* startcluster */
1289 { 0, 0, 0, 0 } /* filesize */
1291 { ".. ", " ", /* the .. entry */
1292 ATTR_DIRECTORY, /* file attribute */
1294 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1295 { 0, 0 }, /* access date */
1296 { 0, 0 }, /* high bits of start cluster */
1297 { 210, 4 }, { 210, 4 }, /* modify time & date */
1298 { 0, 0 }, /* startcluster */
1299 { 0, 0, 0, 0 } /* filesize */
1305 struct vop_mkdir_args /* {
1306 struct vnode *a_dvp;
1307 struvt vnode **a_vpp;
1308 struvt componentname *a_cnp;
1309 struct vattr *a_vap;
1312 struct componentname *cnp = ap->a_cnp;
1314 struct denode *pdep = VTODE(ap->a_dvp);
1315 struct direntry *denp;
1316 struct msdosfsmount *pmp = pdep->de_pmp;
1318 u_long newcluster, pcl;
1321 struct denode ndirent;
1325 * If this is the root directory and there is no space left we
1326 * can't do anything. This is because the root directory can not
1329 if (pdep->de_StartCluster == MSDOSFSROOT
1330 && pdep->de_fndoffset >= pdep->de_FileSize) {
1336 * Allocate a cluster to hold the about to be created directory.
1338 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL);
1342 bzero(&ndirent, sizeof(ndirent));
1343 ndirent.de_pmp = pmp;
1344 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1346 DETIMES(&ndirent, &ts, &ts, &ts);
1349 * Now fill the cluster with the "." and ".." entries. And write
1350 * the cluster to disk. This way it is there for the parent
1351 * directory to be pointing at if there were a crash.
1353 bn = cntobn(pmp, newcluster);
1354 /* always succeeds */
1355 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0);
1356 bzero(bp->b_data, pmp->pm_bpcluster);
1357 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate);
1358 denp = (struct direntry *)bp->b_data;
1359 putushort(denp[0].deStartCluster, newcluster);
1360 putushort(denp[0].deCDate, ndirent.de_CDate);
1361 putushort(denp[0].deCTime, ndirent.de_CTime);
1362 denp[0].deCHundredth = ndirent.de_CHun;
1363 putushort(denp[0].deADate, ndirent.de_ADate);
1364 putushort(denp[0].deMDate, ndirent.de_MDate);
1365 putushort(denp[0].deMTime, ndirent.de_MTime);
1366 pcl = pdep->de_StartCluster;
1367 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1369 putushort(denp[1].deStartCluster, pcl);
1370 putushort(denp[1].deCDate, ndirent.de_CDate);
1371 putushort(denp[1].deCTime, ndirent.de_CTime);
1372 denp[1].deCHundredth = ndirent.de_CHun;
1373 putushort(denp[1].deADate, ndirent.de_ADate);
1374 putushort(denp[1].deMDate, ndirent.de_MDate);
1375 putushort(denp[1].deMTime, ndirent.de_MTime);
1377 putushort(denp[0].deHighClust, newcluster >> 16);
1378 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16);
1386 * Now build up a directory entry pointing to the newly allocated
1387 * cluster. This will be written to an empty slot in the parent
1391 if ((cnp->cn_flags & HASBUF) == 0)
1392 panic("msdosfs_mkdir: no name");
1394 error = uniqdosname(pdep, cnp, ndirent.de_Name);
1398 ndirent.de_Attributes = ATTR_DIRECTORY;
1399 ndirent.de_LowerCase = 0;
1400 ndirent.de_StartCluster = newcluster;
1401 ndirent.de_FileSize = 0;
1402 ndirent.de_dev = pdep->de_dev;
1403 error = createde(&ndirent, pdep, &dep, cnp);
1406 *ap->a_vpp = DETOV(dep);
1410 clusterfree(pmp, newcluster, NULL);
1417 struct vop_rmdir_args /* {
1418 struct vnode *a_dvp;
1420 struct componentname *a_cnp;
1423 struct vnode *vp = ap->a_vp;
1424 struct vnode *dvp = ap->a_dvp;
1425 struct componentname *cnp = ap->a_cnp;
1426 struct denode *ip, *dp;
1427 struct thread *td = cnp->cn_thread;
1434 * Verify the directory is empty (and valid).
1435 * (Rmdir ".." won't be valid since
1436 * ".." will contain a reference to
1437 * the current directory and thus be
1441 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) {
1446 * Delete the entry from the directory. For dos filesystems this
1447 * gets rid of the directory entry on disk, the in memory copy
1448 * still exists but the de_refcnt is <= 0. This prevents it from
1449 * being found by deget(). When the vput() on dep is done we give
1450 * up access and eventually msdosfs_reclaim() will be called which
1451 * will remove it from the denode cache.
1453 error = removede(dp, ip);
1457 * This is where we decrement the link count in the parent
1458 * directory. Since dos filesystems don't do this we just purge
1462 VOP_UNLOCK(dvp, 0, td);
1464 * Truncate the directory that is being deleted.
1466 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, td);
1469 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
1475 * DOS filesystems don't know what symlinks are.
1479 struct vop_symlink_args /* {
1480 struct vnode *a_dvp;
1481 struct vnode **a_vpp;
1482 struct componentname *a_cnp;
1483 struct vattr *a_vap;
1487 return (EOPNOTSUPP);
1492 struct vop_readdir_args /* {
1495 struct ucred *a_cred;
1512 struct denode *dep = VTODE(ap->a_vp);
1513 struct msdosfsmount *pmp = dep->de_pmp;
1514 struct direntry *dentp;
1515 struct dirent dirbuf;
1516 struct uio *uio = ap->a_uio;
1517 u_long *cookies = NULL;
1522 #ifdef MSDOSFS_DEBUG
1523 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
1524 ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
1528 * msdosfs_readdir() won't operate properly on regular files since
1529 * it does i/o only with the the filesystem vnode, and hence can
1530 * retrieve the wrong block from the buffer cache for a plain file.
1531 * So, fail attempts to readdir() on a plain file.
1533 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
1537 * To be safe, initialize dirbuf
1539 bzero(dirbuf.d_name, sizeof(dirbuf.d_name));
1542 * If the user buffer is smaller than the size of one dos directory
1543 * entry or the file offset is not a multiple of the size of a
1544 * directory entry, then we fail the read.
1546 off = offset = uio->uio_offset;
1547 if (uio->uio_resid < sizeof(struct direntry) ||
1548 (offset & (sizeof(struct direntry) - 1)))
1551 if (ap->a_ncookies) {
1552 ncookies = uio->uio_resid / 16;
1553 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP,
1555 *ap->a_cookies = cookies;
1556 *ap->a_ncookies = ncookies;
1559 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1562 * If they are reading from the root directory then, we simulate
1563 * the . and .. entries since these don't exist in the root
1564 * directory. We also set the offset bias to make up for having to
1565 * simulate these entries. By this I mean that at file offset 64 we
1566 * read the first entry in the root directory that lives on disk.
1568 if (dep->de_StartCluster == MSDOSFSROOT
1569 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
1571 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n",
1574 bias = 2 * sizeof(struct direntry);
1575 if (offset < bias) {
1576 for (n = (int)offset / sizeof(struct direntry);
1579 fileno = (uint64_t)cntobn(pmp,
1584 if (pmp->pm_flags & MSDOSFS_LARGEFS) {
1586 msdosfs_fileno_map(pmp->pm_mountp,
1590 dirbuf.d_fileno = (uint32_t)fileno;
1592 dirbuf.d_type = DT_DIR;
1595 dirbuf.d_namlen = 1;
1596 strcpy(dirbuf.d_name, ".");
1599 dirbuf.d_namlen = 2;
1600 strcpy(dirbuf.d_name, "..");
1603 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1604 if (uio->uio_resid < dirbuf.d_reclen)
1606 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1609 offset += sizeof(struct direntry);
1612 *cookies++ = offset;
1613 if (--ncookies <= 0)
1622 while (uio->uio_resid > 0) {
1623 lbn = de_cluster(pmp, offset - bias);
1624 on = (offset - bias) & pmp->pm_crbomask;
1625 n = min(pmp->pm_bpcluster - on, uio->uio_resid);
1626 diff = dep->de_FileSize - (offset - bias);
1630 error = pcbmap(dep, lbn, &bn, &cn, &blsize);
1633 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp);
1638 n = min(n, blsize - bp->b_resid);
1645 * Convert from dos directory entries to fs-independent
1646 * directory entries.
1648 for (dentp = (struct direntry *)(bp->b_data + on);
1649 (char *)dentp < bp->b_data + on + n;
1650 dentp++, offset += sizeof(struct direntry)) {
1652 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
1653 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
1656 * If this is an unused entry, we can stop.
1658 if (dentp->deName[0] == SLOT_EMPTY) {
1663 * Skip deleted entries.
1665 if (dentp->deName[0] == SLOT_DELETED) {
1672 * Handle Win95 long directory entries
1674 if (dentp->deAttributes == ATTR_WIN95) {
1675 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
1677 chksum = win2unixfn((struct winentry *)dentp,
1683 * Skip volume labels
1685 if (dentp->deAttributes & ATTR_VOLUME) {
1691 * This computation of d_fileno must match
1692 * the computation of va_fileid in
1695 if (dentp->deAttributes & ATTR_DIRECTORY) {
1696 fileno = getushort(dentp->deStartCluster);
1698 fileno |= getushort(dentp->deHighClust) << 16;
1699 /* if this is the root directory */
1700 if (fileno == MSDOSFSROOT)
1702 fileno = (uint64_t)cntobn(pmp,
1708 fileno = (uint64_t)cntobn(pmp, fileno) *
1710 dirbuf.d_type = DT_DIR;
1712 fileno = (uint64_t)offset / sizeof(struct direntry);
1713 dirbuf.d_type = DT_REG;
1715 if (pmp->pm_flags & MSDOSFS_LARGEFS) {
1717 msdosfs_fileno_map(pmp->pm_mountp, fileno);
1719 dirbuf.d_fileno = (uint32_t)fileno;
1721 if (chksum != winChksum(dentp)) {
1722 dirbuf.d_namlen = dos2unixfn(dentp->deName,
1723 (u_char *)dirbuf.d_name,
1724 dentp->deLowerCase |
1725 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ?
1726 (LCASE_BASE | LCASE_EXT) : 0),
1730 mbnambuf_flush(&dirbuf);
1732 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1733 if (uio->uio_resid < dirbuf.d_reclen) {
1737 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1743 *cookies++ = offset + sizeof(struct direntry);
1744 if (--ncookies <= 0) {
1749 off = offset + sizeof(struct direntry);
1754 /* Subtract unused cookies */
1756 *ap->a_ncookies -= ncookies;
1758 uio->uio_offset = off;
1761 * Set the eofflag (NFS uses it)
1763 if (ap->a_eofflag) {
1764 if (dep->de_FileSize - (offset - bias) <= 0)
1773 * a_vp - pointer to the file's vnode
1774 * a_bn - logical block number within the file (cluster number for us)
1775 * a_bop - where to return the bufobj of the special file containing the fs
1776 * a_bnp - where to return the "physical" block number corresponding to a_bn
1777 * (relative to the special file; units are blocks of size DEV_BSIZE)
1778 * a_runp - where to return the "run past" a_bn. This is the count of logical
1779 * blocks whose physical blocks (together with a_bn's physical block)
1781 * a_runb - where to return the "run before" a_bn.
1785 struct vop_bmap_args /* {
1788 struct bufobj **a_bop;
1796 struct msdosfsmount *pmp;
1800 int bnpercn, error, maxio, maxrun, run;
1805 if (ap->a_bop != NULL)
1806 *ap->a_bop = &pmp->pm_devvp->v_bufobj;
1807 if (ap->a_bnp == NULL)
1809 if (ap->a_runp != NULL)
1811 if (ap->a_runb != NULL)
1816 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL);
1817 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL))
1821 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize;
1822 bnpercn = de_cn2bn(pmp, 1);
1823 if (ap->a_runp != NULL) {
1824 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn);
1825 for (run = 1; run <= maxrun; run++) {
1826 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 ||
1827 runbn != *ap->a_bnp + run * bnpercn)
1830 *ap->a_runp = run - 1;
1832 if (ap->a_runb != NULL) {
1833 maxrun = ulmin(maxio - 1, cn);
1834 for (run = 1; run < maxrun; run++) {
1835 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 ||
1836 runbn != *ap->a_bnp - run * bnpercn)
1839 *ap->a_runb = run - 1;
1845 msdosfs_strategy(ap)
1846 struct vop_strategy_args /* {
1851 struct buf *bp = ap->a_bp;
1852 struct denode *dep = VTODE(ap->a_vp);
1858 * If we don't already know the filesystem relative block number
1859 * then get it using pcbmap(). If pcbmap() returns the block
1860 * number as -1 then we've got a hole in the file. DOS filesystems
1861 * don't allow files with holes, so we shouldn't ever see this.
1863 if (bp->b_blkno == bp->b_lblkno) {
1864 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0);
1865 bp->b_blkno = blkno;
1867 bp->b_error = error;
1868 bp->b_ioflags |= BIO_ERROR;
1872 if ((long)bp->b_blkno == -1)
1875 if (bp->b_blkno == -1) {
1880 * Read/write the block from/to the disk that contains the desired
1883 bp->b_iooffset = dbtob(bp->b_blkno);
1884 bo = dep->de_pmp->pm_bo;
1885 BO_STRATEGY(bo, bp);
1891 struct vop_print_args /* {
1895 struct denode *dep = VTODE(ap->a_vp);
1897 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ",
1898 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
1899 printf("on dev %s\n", devtoname(dep->de_dev));
1904 msdosfs_pathconf(ap)
1905 struct vop_pathconf_args /* {
1911 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp;
1913 switch (ap->a_name) {
1918 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12;
1921 *ap->a_retval = PATH_MAX;
1923 case _PC_CHOWN_RESTRICTED:
1937 struct vop_advlock_args /* {
1945 struct denode *dep = VTODE(ap->a_vp);
1947 return (lf_advlock(ap, &dep->de_lockf, dep->de_FileSize));
1952 struct vop_vptofh_args /* {
1958 struct defid *defhp;
1960 dep = VTODE(ap->a_vp);
1961 defhp = (struct defid *)ap->a_fhp;
1962 defhp->defid_len = sizeof(struct defid);
1963 defhp->defid_dirclust = dep->de_dirclust;
1964 defhp->defid_dirofs = dep->de_diroffset;
1965 /* defhp->defid_gen = dep->de_gen; */
1969 /* Global vfs data structures for msdosfs */
1970 struct vop_vector msdosfs_vnodeops = {
1971 .vop_default = &default_vnodeops,
1973 .vop_access = msdosfs_access,
1974 .vop_advlock = msdosfs_advlock,
1975 .vop_bmap = msdosfs_bmap,
1976 .vop_cachedlookup = msdosfs_lookup,
1977 .vop_open = msdosfs_open,
1978 .vop_close = msdosfs_close,
1979 .vop_create = msdosfs_create,
1980 .vop_fsync = msdosfs_fsync,
1981 .vop_getattr = msdosfs_getattr,
1982 .vop_inactive = msdosfs_inactive,
1983 .vop_link = msdosfs_link,
1984 .vop_lookup = vfs_cache_lookup,
1985 .vop_mkdir = msdosfs_mkdir,
1986 .vop_mknod = msdosfs_mknod,
1987 .vop_pathconf = msdosfs_pathconf,
1988 .vop_print = msdosfs_print,
1989 .vop_read = msdosfs_read,
1990 .vop_readdir = msdosfs_readdir,
1991 .vop_reclaim = msdosfs_reclaim,
1992 .vop_remove = msdosfs_remove,
1993 .vop_rename = msdosfs_rename,
1994 .vop_rmdir = msdosfs_rmdir,
1995 .vop_setattr = msdosfs_setattr,
1996 .vop_strategy = msdosfs_strategy,
1997 .vop_symlink = msdosfs_symlink,
1998 .vop_write = msdosfs_write,
1999 .vop_vptofh = msdosfs_vptofh,