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/sysctl.h>
66 #include <sys/unistd.h>
67 #include <sys/vmmeter.h>
68 #include <sys/vnode.h>
71 #include <vm/vm_extern.h>
72 #include <vm/vnode_pager.h>
74 #include <fs/msdosfs/bpb.h>
75 #include <fs/msdosfs/direntry.h>
76 #include <fs/msdosfs/denode.h>
77 #include <fs/msdosfs/fat.h>
78 #include <fs/msdosfs/msdosfsmount.h>
80 #define DOS_FILESIZE_MAX 0xffffffff
83 * Prototypes for MSDOSFS vnode operations
85 static vop_create_t msdosfs_create;
86 static vop_mknod_t msdosfs_mknod;
87 static vop_open_t msdosfs_open;
88 static vop_close_t msdosfs_close;
89 static vop_access_t msdosfs_access;
90 static vop_getattr_t msdosfs_getattr;
91 static vop_setattr_t msdosfs_setattr;
92 static vop_read_t msdosfs_read;
93 static vop_write_t msdosfs_write;
94 static vop_fsync_t msdosfs_fsync;
95 static vop_remove_t msdosfs_remove;
96 static vop_link_t msdosfs_link;
97 static vop_rename_t msdosfs_rename;
98 static vop_mkdir_t msdosfs_mkdir;
99 static vop_rmdir_t msdosfs_rmdir;
100 static vop_symlink_t msdosfs_symlink;
101 static vop_readdir_t msdosfs_readdir;
102 static vop_bmap_t msdosfs_bmap;
103 static vop_getpages_t msdosfs_getpages;
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 * retrieve 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.
134 msdosfs_create(struct vop_create_args *ap)
136 struct componentname *cnp = ap->a_cnp;
137 struct denode ndirent;
139 struct denode *pdep = VTODE(ap->a_dvp);
144 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap);
148 * If this is the root directory and there is no space left we
149 * can't do anything. This is because the root directory can not
152 if (pdep->de_StartCluster == MSDOSFSROOT
153 && pdep->de_fndoffset >= pdep->de_FileSize) {
159 * Create a directory entry for the file, then call createde() to
160 * have it installed. NOTE: DOS files are always executable. We
161 * use the absence of the owner write bit to make the file
165 if ((cnp->cn_flags & HASBUF) == 0)
166 panic("msdosfs_create: no name");
168 memset(&ndirent, 0, sizeof(ndirent));
169 error = uniqdosname(pdep, cnp, ndirent.de_Name);
173 ndirent.de_Attributes = ATTR_ARCHIVE;
174 ndirent.de_LowerCase = 0;
175 ndirent.de_StartCluster = 0;
176 ndirent.de_FileSize = 0;
177 ndirent.de_pmp = pdep->de_pmp;
178 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
180 DETIMES(&ndirent, &ts, &ts, &ts);
181 error = createde(&ndirent, pdep, &dep, cnp);
184 *ap->a_vpp = DETOV(dep);
185 if ((cnp->cn_flags & MAKEENTRY) != 0)
186 cache_enter(ap->a_dvp, *ap->a_vpp, cnp);
194 msdosfs_mknod(struct vop_mknod_args *ap)
201 msdosfs_open(struct vop_open_args *ap)
203 struct denode *dep = VTODE(ap->a_vp);
204 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td);
209 msdosfs_close(struct vop_close_args *ap)
211 struct vnode *vp = ap->a_vp;
212 struct denode *dep = VTODE(vp);
216 if (vp->v_usecount > 1) {
218 DETIMES(dep, &ts, &ts, &ts);
225 msdosfs_access(struct vop_access_args *ap)
227 struct vnode *vp = ap->a_vp;
228 struct denode *dep = VTODE(ap->a_vp);
229 struct msdosfsmount *pmp = dep->de_pmp;
231 accmode_t accmode = ap->a_accmode;
233 file_mode = S_IRWXU|S_IRWXG|S_IRWXO;
234 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
237 * Disallow writing to directories and regular files if the
238 * filesystem is read-only.
240 if (accmode & VWRITE) {
241 switch (vp->v_type) {
244 if (vp->v_mount->mnt_flag & MNT_RDONLY)
252 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid,
253 ap->a_accmode, ap->a_cred, NULL));
257 msdosfs_getattr(struct vop_getattr_args *ap)
259 struct denode *dep = VTODE(ap->a_vp);
260 struct msdosfsmount *pmp = dep->de_pmp;
261 struct vattr *vap = ap->a_vap;
264 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
268 DETIMES(dep, &ts, &ts, &ts);
269 vap->va_fsid = dev2udev(pmp->pm_dev);
271 * The following computation of the fileid must be the same as that
272 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
275 if (dep->de_Attributes & ATTR_DIRECTORY) {
276 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) *
278 if (dep->de_StartCluster == MSDOSFSROOT)
281 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) *
283 if (dep->de_dirclust == MSDOSFSROOT)
284 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk;
285 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry);
288 if (pmp->pm_flags & MSDOSFS_LARGEFS)
289 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid);
291 vap->va_fileid = (long)fileid;
293 mode = S_IRWXU|S_IRWXG|S_IRWXO;
294 vap->va_mode = mode &
295 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
296 vap->va_uid = pmp->pm_uid;
297 vap->va_gid = pmp->pm_gid;
299 vap->va_rdev = NODEV;
300 vap->va_size = dep->de_FileSize;
301 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime);
302 vap->va_ctime = vap->va_mtime;
303 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
304 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime);
305 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun,
306 0, &vap->va_birthtime);
308 vap->va_atime = vap->va_mtime;
309 vap->va_birthtime.tv_sec = -1;
310 vap->va_birthtime.tv_nsec = 0;
313 if (dep->de_Attributes & ATTR_ARCHIVE)
314 vap->va_flags |= UF_ARCHIVE;
315 if (dep->de_Attributes & ATTR_HIDDEN)
316 vap->va_flags |= UF_HIDDEN;
317 if (dep->de_Attributes & ATTR_READONLY)
318 vap->va_flags |= UF_READONLY;
319 if (dep->de_Attributes & ATTR_SYSTEM)
320 vap->va_flags |= UF_SYSTEM;
322 vap->va_blocksize = pmp->pm_bpcluster;
324 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
325 vap->va_type = ap->a_vp->v_type;
326 vap->va_filerev = dep->de_modrev;
331 msdosfs_setattr(struct vop_setattr_args *ap)
333 struct vnode *vp = ap->a_vp;
334 struct denode *dep = VTODE(ap->a_vp);
335 struct msdosfsmount *pmp = dep->de_pmp;
336 struct vattr *vap = ap->a_vap;
337 struct ucred *cred = ap->a_cred;
338 struct thread *td = curthread;
342 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n",
343 ap->a_vp, vap, cred);
347 * Check for unsettable attributes.
349 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
350 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
351 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
352 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
354 printf("msdosfs_setattr(): returning EINVAL\n");
355 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n",
356 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid);
357 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n",
358 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen);
359 printf(" va_uid %x, va_gid %x\n",
360 vap->va_uid, vap->va_gid);
366 * We don't allow setting attributes on the root directory.
367 * The special case for the root directory is because before
368 * FAT32, the root directory didn't have an entry for itself
369 * (and was otherwise special). With FAT32, the root
370 * directory is not so special, but still doesn't have an
373 if (vp->v_vflag & VV_ROOT)
376 if (vap->va_flags != VNOVAL) {
377 if (vp->v_mount->mnt_flag & MNT_RDONLY)
379 if (cred->cr_uid != pmp->pm_uid) {
380 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
385 * We are very inconsistent about handling unsupported
386 * attributes. We ignored the access time and the
387 * read and execute bits. We were strict for the other
390 if (vap->va_flags & ~(UF_ARCHIVE | UF_HIDDEN | UF_READONLY |
393 if (vap->va_flags & UF_ARCHIVE)
394 dep->de_Attributes |= ATTR_ARCHIVE;
396 dep->de_Attributes &= ~ATTR_ARCHIVE;
397 if (vap->va_flags & UF_HIDDEN)
398 dep->de_Attributes |= ATTR_HIDDEN;
400 dep->de_Attributes &= ~ATTR_HIDDEN;
401 /* We don't allow changing the readonly bit on directories. */
402 if (vp->v_type != VDIR) {
403 if (vap->va_flags & UF_READONLY)
404 dep->de_Attributes |= ATTR_READONLY;
406 dep->de_Attributes &= ~ATTR_READONLY;
408 if (vap->va_flags & UF_SYSTEM)
409 dep->de_Attributes |= ATTR_SYSTEM;
411 dep->de_Attributes &= ~ATTR_SYSTEM;
412 dep->de_flag |= DE_MODIFIED;
415 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
419 if (vp->v_mount->mnt_flag & MNT_RDONLY)
422 if (uid == (uid_t)VNOVAL)
425 if (gid == (gid_t)VNOVAL)
427 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid ||
428 (gid != pmp->pm_gid && !groupmember(gid, cred))) {
429 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
433 if (uid != pmp->pm_uid || gid != pmp->pm_gid)
437 if (vap->va_size != VNOVAL) {
438 switch (vp->v_type) {
443 * Truncation is only supported for regular files,
444 * Disallow it if the filesystem is read-only.
446 if (vp->v_mount->mnt_flag & MNT_RDONLY)
451 * According to POSIX, the result is unspecified
452 * for file types other than regular files,
453 * directories and shared memory objects. We
454 * don't support any file types except regular
455 * files and directories in this file system, so
456 * this (default) case is unreachable and can do
457 * anything. Keep falling through to detrunc()
462 error = detrunc(dep, vap->va_size, 0, cred);
466 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
467 if (vp->v_mount->mnt_flag & MNT_RDONLY)
469 error = vn_utimes_perm(vp, vap, cred, td);
472 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 &&
473 vap->va_atime.tv_sec != VNOVAL) {
474 dep->de_flag &= ~DE_ACCESS;
475 timespec2fattime(&vap->va_atime, 0,
476 &dep->de_ADate, NULL, NULL);
478 if (vap->va_mtime.tv_sec != VNOVAL) {
479 dep->de_flag &= ~DE_UPDATE;
480 timespec2fattime(&vap->va_mtime, 0,
481 &dep->de_MDate, &dep->de_MTime, NULL);
484 * We don't set the archive bit when modifying the time of
485 * a directory to emulate the Windows/DOS behavior.
487 if (vp->v_type != VDIR)
488 dep->de_Attributes |= ATTR_ARCHIVE;
489 dep->de_flag |= DE_MODIFIED;
492 * DOS files only have the ability to have their writability
493 * attribute set, so we use the owner write bit to set the readonly
496 if (vap->va_mode != (mode_t)VNOVAL) {
497 if (vp->v_mount->mnt_flag & MNT_RDONLY)
499 if (cred->cr_uid != pmp->pm_uid) {
500 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
504 if (vp->v_type != VDIR) {
505 /* We ignore the read and execute bits. */
506 if (vap->va_mode & VWRITE)
507 dep->de_Attributes &= ~ATTR_READONLY;
509 dep->de_Attributes |= ATTR_READONLY;
510 dep->de_Attributes |= ATTR_ARCHIVE;
511 dep->de_flag |= DE_MODIFIED;
514 return (deupdat(dep, 0));
518 msdosfs_read(struct vop_read_args *ap)
532 struct vnode *vp = ap->a_vp;
533 struct denode *dep = VTODE(vp);
534 struct msdosfsmount *pmp = dep->de_pmp;
535 struct uio *uio = ap->a_uio;
538 * If they didn't ask for any data, then we are done.
540 orig_resid = uio->uio_resid;
545 * The caller is supposed to ensure that
546 * uio->uio_offset >= 0 and uio->uio_resid >= 0.
547 * We don't need to check for large offsets as in ffs because
548 * dep->de_FileSize <= DOS_FILESIZE_MAX < OFF_MAX, so large
549 * offsets cannot cause overflow even in theory.
552 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
554 isadir = dep->de_Attributes & ATTR_DIRECTORY;
556 if (uio->uio_offset >= dep->de_FileSize)
558 lbn = de_cluster(pmp, uio->uio_offset);
560 blsize = pmp->pm_bpcluster;
561 on = uio->uio_offset & pmp->pm_crbomask;
563 * If we are operating on a directory file then be sure to
564 * do i/o with the vnode for the filesystem instead of the
565 * vnode for the directory.
568 /* convert cluster # to block # */
569 error = pcbmap(dep, lbn, &lbn, 0, &blsize);
570 if (error == E2BIG) {
575 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp);
576 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) {
577 error = bread(vp, lbn, blsize, NOCRED, &bp);
578 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
579 error = cluster_read(vp, dep->de_FileSize, lbn, blsize,
580 NOCRED, on + uio->uio_resid, seqcount, 0, &bp);
581 } else if (seqcount > 1) {
583 error = breadn(vp, lbn,
584 blsize, &rablock, &rasize, 1, NOCRED, &bp);
586 error = bread(vp, lbn, blsize, NOCRED, &bp);
592 diff = pmp->pm_bpcluster - on;
593 n = diff > uio->uio_resid ? uio->uio_resid : diff;
594 diff = dep->de_FileSize - uio->uio_offset;
597 diff = blsize - bp->b_resid;
600 error = vn_io_fault_uiomove(bp->b_data + on, (int) n, uio);
602 } while (error == 0 && uio->uio_resid > 0 && n != 0);
603 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) &&
604 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0)
605 dep->de_flag |= DE_ACCESS;
610 * Write data to a file or directory.
613 msdosfs_write(struct vop_write_args *ap)
624 int ioflag = ap->a_ioflag;
625 struct uio *uio = ap->a_uio;
626 struct vnode *vp = ap->a_vp;
627 struct vnode *thisvp;
628 struct denode *dep = VTODE(vp);
629 struct msdosfsmount *pmp = dep->de_pmp;
630 struct ucred *cred = ap->a_cred;
633 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
634 vp, uio, ioflag, cred);
635 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
636 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
639 switch (vp->v_type) {
641 if (ioflag & IO_APPEND)
642 uio->uio_offset = dep->de_FileSize;
648 panic("msdosfs_write(): bad file type");
652 * This is needed (unlike in ffs_write()) because we extend the
653 * file outside of the loop but we don't want to extend the file
654 * for writes of 0 bytes.
656 if (uio->uio_resid == 0)
660 * The caller is supposed to ensure that
661 * uio->uio_offset >= 0 and uio->uio_resid >= 0.
663 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX)
667 * If they've exceeded their filesize limit, tell them about it.
669 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
673 * If the offset we are starting the write at is beyond the end of
674 * the file, then they've done a seek. Unix filesystems allow
675 * files with holes in them, DOS doesn't so we must fill the hole
676 * with zeroed blocks.
678 if (uio->uio_offset > dep->de_FileSize) {
679 error = deextend(dep, uio->uio_offset, cred);
685 * Remember some values in case the write fails.
687 resid = uio->uio_resid;
688 osize = dep->de_FileSize;
691 * If we write beyond the end of the file, extend it to its ultimate
692 * size ahead of the time to hopefully get a contiguous area.
694 if (uio->uio_offset + resid > osize) {
695 count = de_clcount(pmp, uio->uio_offset + resid) -
696 de_clcount(pmp, osize);
697 error = extendfile(dep, count, NULL, NULL, 0);
698 if (error && (error != ENOSPC || (ioflag & IO_UNIT)))
700 lastcn = dep->de_fc[FC_LASTFC].fc_frcn;
702 lastcn = de_clcount(pmp, osize) - 1;
704 seqcount = ioflag >> IO_SEQSHIFT;
706 if (de_cluster(pmp, uio->uio_offset) > lastcn) {
711 croffset = uio->uio_offset & pmp->pm_crbomask;
712 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset);
713 if (uio->uio_offset + n > dep->de_FileSize) {
714 dep->de_FileSize = uio->uio_offset + n;
715 /* The object size needs to be set before buffer is allocated */
716 vnode_pager_setsize(vp, dep->de_FileSize);
719 bn = de_cluster(pmp, uio->uio_offset);
720 if ((uio->uio_offset & pmp->pm_crbomask) == 0
721 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid)
722 > de_cluster(pmp, uio->uio_offset)
723 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) {
725 * If either the whole cluster gets written,
726 * or we write the cluster from its start beyond EOF,
727 * then no need to read data from disk.
729 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0);
731 * This call to vfs_bio_clrbuf() ensures that
732 * even if vn_io_fault_uiomove() below faults,
733 * garbage from the newly instantiated buffer
734 * is not exposed to the userspace via mmap().
738 * Do the bmap now, since pcbmap needs buffers
739 * for the FAT table. (see msdosfs_strategy)
741 if (bp->b_blkno == bp->b_lblkno) {
742 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0);
748 if (bp->b_blkno == -1) {
751 error = EIO; /* XXX */
756 * The block we need to write into exists, so read it in.
758 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp);
766 * Should these vnode_pager_* functions be done on dir
771 * Copy the data from user space into the buf header.
773 error = vn_io_fault_uiomove(bp->b_data + croffset, n, uio);
779 /* Prepare for clustered writes in some else clauses. */
780 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
781 bp->b_flags |= B_CLUSTEROK;
784 * If IO_SYNC, then each buffer is written synchronously.
785 * Otherwise, if we have a severe page deficiency then
786 * write the buffer asynchronously. Otherwise, if on a
787 * cluster boundary then write the buffer asynchronously,
788 * combining it with contiguous clusters if permitted and
789 * possible, since we don't expect more writes into this
790 * buffer soon. Otherwise, do a delayed write because we
791 * expect more writes into this buffer soon.
793 if (ioflag & IO_SYNC)
795 else if (vm_page_count_severe() || buf_dirty_count_severe())
797 else if (n + croffset == pmp->pm_bpcluster) {
798 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
799 cluster_write(vp, bp, dep->de_FileSize,
805 dep->de_flag |= DE_UPDATE;
806 } while (error == 0 && uio->uio_resid > 0);
809 * If the write failed and they want us to, truncate the file back
810 * to the size it was before the write was attempted.
814 if (ioflag & IO_UNIT) {
815 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED);
816 uio->uio_offset -= resid - uio->uio_resid;
817 uio->uio_resid = resid;
819 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED);
820 if (uio->uio_resid != resid)
823 } else if (ioflag & IO_SYNC)
824 error = deupdat(dep, 1);
829 * Flush the blocks of a file to disk.
832 msdosfs_fsync(struct vop_fsync_args *ap)
840 * If the syncing request comes from fsync(2), sync the entire
841 * FAT and any other metadata that happens to be on devvp. We
842 * need this mainly for the FAT. We write the FAT sloppily, and
843 * syncing it all now is the best we can easily do to get all
844 * directory entries associated with the file (not just the file)
845 * fully synced. The other metadata includes critical metadata
846 * for all directory entries, but only in the MNT_ASYNC case. We
847 * will soon sync all metadata in the file's directory entry.
848 * Non-critical metadata for associated directory entries only
849 * gets synced accidentally, as in most file systems.
851 if (ap->a_waitfor == MNT_WAIT) {
852 devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp;
853 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
854 allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td);
855 VOP_UNLOCK(devvp, 0);
859 error = deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT);
866 msdosfs_remove(struct vop_remove_args *ap)
868 struct denode *dep = VTODE(ap->a_vp);
869 struct denode *ddep = VTODE(ap->a_dvp);
872 if (ap->a_vp->v_type == VDIR)
875 error = removede(ddep, dep);
877 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount);
883 * DOS filesystems don't know what links are.
886 msdosfs_link(struct vop_link_args *ap)
892 * Renames on files require moving the denode to a new hash queue since the
893 * denode's location is used to compute which hash queue to put the file
894 * in. Unless it is a rename in place. For example "mv a b".
896 * What follows is the basic algorithm:
899 * if (dest file exists) {
902 * if (dest and src in same directory) {
903 * rewrite name in existing directory slot
905 * write new entry in dest directory
906 * update offset and dirclust in denode
907 * move denode to new hash chain
908 * clear old directory entry
912 * if (dest directory exists) {
913 * if (dest is not empty) {
916 * remove dest directory
918 * if (dest and src in same directory) {
919 * rewrite name in existing entry
921 * be sure dest is not a child of src directory
922 * write entry in dest directory
923 * update "." and ".." in moved directory
924 * clear old directory entry for moved directory
929 * source's parent directory is unlocked
930 * source file or directory is unlocked
931 * destination's parent directory is locked
932 * destination file or directory is locked if it exists
935 * all denodes should be released
938 msdosfs_rename(struct vop_rename_args *ap)
940 struct vnode *tdvp = ap->a_tdvp;
941 struct vnode *fvp = ap->a_fvp;
942 struct vnode *fdvp = ap->a_fdvp;
943 struct vnode *tvp = ap->a_tvp;
944 struct componentname *tcnp = ap->a_tcnp;
945 struct componentname *fcnp = ap->a_fcnp;
946 struct denode *ip, *xp, *dp, *zp;
947 u_char toname[12], oldname[11];
948 u_long from_diroffset, to_diroffset;
950 int doingdirectory = 0, newparent = 0;
954 struct msdosfsmount *pmp;
955 struct direntry *dotdotp;
958 pmp = VFSTOMSDOSFS(fdvp->v_mount);
961 if ((tcnp->cn_flags & HASBUF) == 0 ||
962 (fcnp->cn_flags & HASBUF) == 0)
963 panic("msdosfs_rename: no name");
966 * Check for cross-device rename.
968 if (fvp->v_mount != tdvp->v_mount ||
969 (tvp && fvp->v_mount != tvp->v_mount)) {
984 * If source and dest are the same, do nothing.
991 error = vn_lock(fvp, LK_EXCLUSIVE);
998 * Be sure we are not renaming ".", "..", or an alias of ".". This
999 * leads to a crippled directory tree. It's pretty tough to do a
1000 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
1001 * doesn't work if the ".." entry is missing.
1003 if (ip->de_Attributes & ATTR_DIRECTORY) {
1005 * Avoid ".", "..", and aliases of "." for obvious reasons.
1007 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
1009 (fcnp->cn_flags & ISDOTDOT) ||
1010 (tcnp->cn_flags & ISDOTDOT) ||
1011 (ip->de_flag & DE_RENAME)) {
1016 ip->de_flag |= DE_RENAME;
1021 * When the target exists, both the directory
1022 * and target vnodes are returned locked.
1025 xp = tvp ? VTODE(tvp) : NULL;
1027 * Remember direntry place to use for destination
1029 to_diroffset = dp->de_fndoffset;
1030 to_count = dp->de_fndcnt;
1033 * If ".." must be changed (ie the directory gets a new
1034 * parent) then the source directory must not be in the
1035 * directory hierarchy above the target, as this would
1036 * orphan everything below the source directory. Also
1037 * the user must have write permission in the source so
1038 * as to be able to change "..". We must repeat the call
1039 * to namei, as the parent directory is unlocked by the
1040 * call to doscheckpath().
1042 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
1044 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
1046 if (doingdirectory && newparent) {
1047 if (error) /* write access check above */
1052 * doscheckpath() vput()'s dp,
1053 * so we have to do a relookup afterwards
1055 error = doscheckpath(ip, dp);
1058 if ((tcnp->cn_flags & SAVESTART) == 0)
1059 panic("msdosfs_rename: lost to startdir");
1060 error = relookup(tdvp, &tvp, tcnp);
1064 xp = tvp ? VTODE(tvp) : NULL;
1069 * Target must be empty if a directory and have no links
1070 * to it. Also, ensure source and target are compatible
1071 * (both directories, or both not directories).
1073 if (xp->de_Attributes & ATTR_DIRECTORY) {
1074 if (!dosdirempty(xp)) {
1078 if (!doingdirectory) {
1083 } else if (doingdirectory) {
1087 error = removede(dp, xp);
1095 * Convert the filename in tcnp into a dos filename. We copy this
1096 * into the denode and directory entry for the destination
1099 error = uniqdosname(VTODE(tdvp), tcnp, toname);
1104 * Since from wasn't locked at various places above,
1105 * have to do a relookup here.
1107 fcnp->cn_flags &= ~MODMASK;
1108 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1109 if ((fcnp->cn_flags & SAVESTART) == 0)
1110 panic("msdosfs_rename: lost from startdir");
1112 VOP_UNLOCK(tdvp, 0);
1113 if (relookup(fdvp, &fvp, fcnp) == 0)
1117 * From name has disappeared.
1120 panic("rename: lost dir entry");
1122 VOP_UNLOCK(tdvp, 0);
1129 from_diroffset = zp->de_fndoffset;
1132 * Ensure that the directory entry still exists and has not
1133 * changed till now. If the source is a file the entry may
1134 * have been unlinked or renamed. In either case there is
1135 * no further work to be done. If the source is a directory
1136 * then it cannot have been rmdir'ed or renamed; this is
1137 * prohibited by the DE_RENAME flag.
1141 panic("rename: lost dir entry");
1144 VOP_UNLOCK(fdvp, 0);
1152 * First write a new entry in the destination
1153 * directory and mark the entry in the source directory
1154 * as deleted. Then move the denode to the correct hash
1155 * chain for its new location in the filesystem. And, if
1156 * we moved a directory, then update its .. entry to point
1157 * to the new parent directory.
1159 memcpy(oldname, ip->de_Name, 11);
1160 memcpy(ip->de_Name, toname, 11); /* update denode */
1161 dp->de_fndoffset = to_diroffset;
1162 dp->de_fndcnt = to_count;
1163 error = createde(ip, dp, (struct denode **)0, tcnp);
1165 memcpy(ip->de_Name, oldname, 11);
1167 VOP_UNLOCK(fdvp, 0);
1172 * If ip is for a directory, then its name should always
1173 * be "." since it is for the directory entry in the
1174 * directory itself (msdosfs_lookup() always translates
1175 * to the "." entry so as to get a unique denode, except
1176 * for the root directory there are different
1177 * complications). However, we just corrupted its name
1178 * to pass the correct name to createde(). Undo this.
1180 if ((ip->de_Attributes & ATTR_DIRECTORY) != 0)
1181 memcpy(ip->de_Name, oldname, 11);
1183 zp->de_fndoffset = from_diroffset;
1184 error = removede(zp, ip);
1186 /* XXX should downgrade to ro here, fs is corrupt */
1188 VOP_UNLOCK(fdvp, 0);
1192 if (!doingdirectory) {
1193 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0,
1194 &ip->de_dirclust, 0);
1196 /* XXX should downgrade to ro here, fs is corrupt */
1198 VOP_UNLOCK(fdvp, 0);
1202 if (ip->de_dirclust == MSDOSFSROOT)
1203 ip->de_diroffset = to_diroffset;
1205 ip->de_diroffset = to_diroffset & pmp->pm_crbomask;
1209 VOP_UNLOCK(fdvp, 0);
1213 * If we moved a directory to a new parent directory, then we must
1214 * fixup the ".." entry in the moved directory.
1216 if (doingdirectory && newparent) {
1217 cn = ip->de_StartCluster;
1218 if (cn == MSDOSFSROOT) {
1219 /* this should never happen */
1220 panic("msdosfs_rename(): updating .. in root directory?");
1222 bn = cntobn(pmp, cn);
1223 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
1226 /* XXX should downgrade to ro here, fs is corrupt */
1231 dotdotp = (struct direntry *)bp->b_data + 1;
1232 pcl = dp->de_StartCluster;
1233 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1235 putushort(dotdotp->deStartCluster, pcl);
1237 putushort(dotdotp->deHighClust, pcl >> 16);
1238 if (DOINGASYNC(fvp))
1240 else if ((error = bwrite(bp)) != 0) {
1241 /* XXX should downgrade to ro here, fs is corrupt */
1248 * The msdosfs lookup is case insensitive. Several aliases may
1249 * be inserted for a single directory entry. As a consequnce,
1250 * name cache purge done by lookup for fvp when DELETE op for
1251 * namei is specified, might be not enough to expunge all
1252 * namecache entries that were installed for this direntry.
1261 ip->de_flag &= ~DE_RENAME;
1269 struct direntry dot;
1270 struct direntry dotdot;
1271 } dosdirtemplate = {
1272 { ". ", /* the . entry */
1273 ATTR_DIRECTORY, /* file attribute */
1275 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1276 { 0, 0 }, /* access date */
1277 { 0, 0 }, /* high bits of start cluster */
1278 { 210, 4 }, { 210, 4 }, /* modify time & date */
1279 { 0, 0 }, /* startcluster */
1280 { 0, 0, 0, 0 } /* filesize */
1282 { ".. ", /* the .. entry */
1283 ATTR_DIRECTORY, /* file attribute */
1285 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1286 { 0, 0 }, /* access date */
1287 { 0, 0 }, /* high bits of start cluster */
1288 { 210, 4 }, { 210, 4 }, /* modify time & date */
1289 { 0, 0 }, /* startcluster */
1290 { 0, 0, 0, 0 } /* filesize */
1295 msdosfs_mkdir(struct vop_mkdir_args *ap)
1297 struct componentname *cnp = ap->a_cnp;
1299 struct denode *pdep = VTODE(ap->a_dvp);
1300 struct direntry *denp;
1301 struct msdosfsmount *pmp = pdep->de_pmp;
1303 u_long newcluster, pcl;
1306 struct denode ndirent;
1310 * If this is the root directory and there is no space left we
1311 * can't do anything. This is because the root directory can not
1314 if (pdep->de_StartCluster == MSDOSFSROOT
1315 && pdep->de_fndoffset >= pdep->de_FileSize) {
1321 * Allocate a cluster to hold the about to be created directory.
1323 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL);
1327 memset(&ndirent, 0, sizeof(ndirent));
1328 ndirent.de_pmp = pmp;
1329 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1331 DETIMES(&ndirent, &ts, &ts, &ts);
1334 * Now fill the cluster with the "." and ".." entries. And write
1335 * the cluster to disk. This way it is there for the parent
1336 * directory to be pointing at if there were a crash.
1338 bn = cntobn(pmp, newcluster);
1339 /* always succeeds */
1340 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0);
1341 memset(bp->b_data, 0, pmp->pm_bpcluster);
1342 memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate);
1343 denp = (struct direntry *)bp->b_data;
1344 putushort(denp[0].deStartCluster, newcluster);
1345 putushort(denp[0].deCDate, ndirent.de_CDate);
1346 putushort(denp[0].deCTime, ndirent.de_CTime);
1347 denp[0].deCHundredth = ndirent.de_CHun;
1348 putushort(denp[0].deADate, ndirent.de_ADate);
1349 putushort(denp[0].deMDate, ndirent.de_MDate);
1350 putushort(denp[0].deMTime, ndirent.de_MTime);
1351 pcl = pdep->de_StartCluster;
1353 * Although the root directory has a non-magic starting cluster
1354 * number for FAT32, chkdsk and fsck_msdosfs still require
1355 * references to it in dotdot entries to be magic.
1357 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1359 putushort(denp[1].deStartCluster, pcl);
1360 putushort(denp[1].deCDate, ndirent.de_CDate);
1361 putushort(denp[1].deCTime, ndirent.de_CTime);
1362 denp[1].deCHundredth = ndirent.de_CHun;
1363 putushort(denp[1].deADate, ndirent.de_ADate);
1364 putushort(denp[1].deMDate, ndirent.de_MDate);
1365 putushort(denp[1].deMTime, ndirent.de_MTime);
1367 putushort(denp[0].deHighClust, newcluster >> 16);
1368 putushort(denp[1].deHighClust, pcl >> 16);
1371 if (DOINGASYNC(ap->a_dvp))
1373 else if ((error = bwrite(bp)) != 0)
1377 * Now build up a directory entry pointing to the newly allocated
1378 * cluster. This will be written to an empty slot in the parent
1382 if ((cnp->cn_flags & HASBUF) == 0)
1383 panic("msdosfs_mkdir: no name");
1385 error = uniqdosname(pdep, cnp, ndirent.de_Name);
1389 ndirent.de_Attributes = ATTR_DIRECTORY;
1390 ndirent.de_LowerCase = 0;
1391 ndirent.de_StartCluster = newcluster;
1392 ndirent.de_FileSize = 0;
1393 error = createde(&ndirent, pdep, &dep, cnp);
1396 *ap->a_vpp = DETOV(dep);
1400 clusterfree(pmp, newcluster, NULL);
1406 msdosfs_rmdir(struct vop_rmdir_args *ap)
1408 struct vnode *vp = ap->a_vp;
1409 struct vnode *dvp = ap->a_dvp;
1410 struct componentname *cnp = ap->a_cnp;
1411 struct denode *ip, *dp;
1418 * Verify the directory is empty (and valid).
1419 * (Rmdir ".." won't be valid since
1420 * ".." will contain a reference to
1421 * the current directory and thus be
1425 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) {
1430 * Delete the entry from the directory. For dos filesystems this
1431 * gets rid of the directory entry on disk, the in memory copy
1432 * still exists but the de_refcnt is <= 0. This prevents it from
1433 * being found by deget(). When the vput() on dep is done we give
1434 * up access and eventually msdosfs_reclaim() will be called which
1435 * will remove it from the denode cache.
1437 error = removede(dp, ip);
1441 * This is where we decrement the link count in the parent
1442 * directory. Since dos filesystems don't do this we just purge
1447 * Truncate the directory that is being deleted.
1449 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred);
1457 * DOS filesystems don't know what symlinks are.
1460 msdosfs_symlink(struct vop_symlink_args *ap)
1462 return (EOPNOTSUPP);
1466 msdosfs_readdir(struct vop_readdir_args *ap)
1480 struct denode *dep = VTODE(ap->a_vp);
1481 struct msdosfsmount *pmp = dep->de_pmp;
1482 struct direntry *dentp;
1483 struct dirent dirbuf;
1484 struct uio *uio = ap->a_uio;
1485 u_long *cookies = NULL;
1490 #ifdef MSDOSFS_DEBUG
1491 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
1492 ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
1496 * msdosfs_readdir() won't operate properly on regular files since
1497 * it does i/o only with the filesystem vnode, and hence can
1498 * retrieve the wrong block from the buffer cache for a plain file.
1499 * So, fail attempts to readdir() on a plain file.
1501 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
1505 * To be safe, initialize dirbuf
1507 memset(dirbuf.d_name, 0, sizeof(dirbuf.d_name));
1510 * If the user buffer is smaller than the size of one dos directory
1511 * entry or the file offset is not a multiple of the size of a
1512 * directory entry, then we fail the read.
1514 off = offset = uio->uio_offset;
1515 if (uio->uio_resid < sizeof(struct direntry) ||
1516 (offset & (sizeof(struct direntry) - 1)))
1519 if (ap->a_ncookies) {
1520 ncookies = uio->uio_resid / 16;
1521 cookies = malloc(ncookies * sizeof(u_long), M_TEMP,
1523 *ap->a_cookies = cookies;
1524 *ap->a_ncookies = ncookies;
1527 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1530 * If they are reading from the root directory then, we simulate
1531 * the . and .. entries since these don't exist in the root
1532 * directory. We also set the offset bias to make up for having to
1533 * simulate these entries. By this I mean that at file offset 64 we
1534 * read the first entry in the root directory that lives on disk.
1536 if (dep->de_StartCluster == MSDOSFSROOT
1537 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
1539 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n",
1542 bias = 2 * sizeof(struct direntry);
1543 if (offset < bias) {
1544 for (n = (int)offset / sizeof(struct direntry);
1547 fileno = (uint64_t)cntobn(pmp,
1552 if (pmp->pm_flags & MSDOSFS_LARGEFS) {
1554 msdosfs_fileno_map(pmp->pm_mountp,
1558 dirbuf.d_fileno = (uint32_t)fileno;
1560 dirbuf.d_type = DT_DIR;
1563 dirbuf.d_namlen = 1;
1564 strcpy(dirbuf.d_name, ".");
1567 dirbuf.d_namlen = 2;
1568 strcpy(dirbuf.d_name, "..");
1571 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1572 if (uio->uio_resid < dirbuf.d_reclen)
1574 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1577 offset += sizeof(struct direntry);
1580 *cookies++ = offset;
1581 if (--ncookies <= 0)
1590 while (uio->uio_resid > 0) {
1591 lbn = de_cluster(pmp, offset - bias);
1592 on = (offset - bias) & pmp->pm_crbomask;
1593 n = min(pmp->pm_bpcluster - on, uio->uio_resid);
1594 diff = dep->de_FileSize - (offset - bias);
1598 error = pcbmap(dep, lbn, &bn, &cn, &blsize);
1601 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp);
1606 n = min(n, blsize - bp->b_resid);
1613 * Convert from dos directory entries to fs-independent
1614 * directory entries.
1616 for (dentp = (struct direntry *)(bp->b_data + on);
1617 (char *)dentp < bp->b_data + on + n;
1618 dentp++, offset += sizeof(struct direntry)) {
1620 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
1621 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
1624 * If this is an unused entry, we can stop.
1626 if (dentp->deName[0] == SLOT_EMPTY) {
1631 * Skip deleted entries.
1633 if (dentp->deName[0] == SLOT_DELETED) {
1640 * Handle Win95 long directory entries
1642 if (dentp->deAttributes == ATTR_WIN95) {
1643 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
1645 chksum = win2unixfn(&nb,
1646 (struct winentry *)dentp, chksum, pmp);
1651 * Skip volume labels
1653 if (dentp->deAttributes & ATTR_VOLUME) {
1659 * This computation of d_fileno must match
1660 * the computation of va_fileid in
1663 if (dentp->deAttributes & ATTR_DIRECTORY) {
1664 fileno = getushort(dentp->deStartCluster);
1666 fileno |= getushort(dentp->deHighClust) << 16;
1667 /* if this is the root directory */
1668 if (fileno == MSDOSFSROOT)
1670 fileno = (uint64_t)cntobn(pmp,
1676 fileno = (uint64_t)cntobn(pmp, fileno) *
1678 dirbuf.d_type = DT_DIR;
1680 fileno = (uoff_t)offset /
1681 sizeof(struct direntry);
1682 dirbuf.d_type = DT_REG;
1684 if (pmp->pm_flags & MSDOSFS_LARGEFS) {
1686 msdosfs_fileno_map(pmp->pm_mountp, fileno);
1688 dirbuf.d_fileno = (uint32_t)fileno;
1690 if (chksum != winChksum(dentp->deName)) {
1691 dirbuf.d_namlen = dos2unixfn(dentp->deName,
1692 (u_char *)dirbuf.d_name,
1693 dentp->deLowerCase |
1694 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ?
1695 (LCASE_BASE | LCASE_EXT) : 0),
1699 mbnambuf_flush(&nb, &dirbuf);
1701 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1702 if (uio->uio_resid < dirbuf.d_reclen) {
1706 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1712 *cookies++ = offset + sizeof(struct direntry);
1713 if (--ncookies <= 0) {
1718 off = offset + sizeof(struct direntry);
1723 /* Subtract unused cookies */
1725 *ap->a_ncookies -= ncookies;
1727 uio->uio_offset = off;
1730 * Set the eofflag (NFS uses it)
1732 if (ap->a_eofflag) {
1733 if (dep->de_FileSize - (offset - bias) <= 0)
1742 * a_vp - pointer to the file's vnode
1743 * a_bn - logical block number within the file (cluster number for us)
1744 * a_bop - where to return the bufobj of the special file containing the fs
1745 * a_bnp - where to return the "physical" block number corresponding to a_bn
1746 * (relative to the special file; units are blocks of size DEV_BSIZE)
1747 * a_runp - where to return the "run past" a_bn. This is the count of logical
1748 * blocks whose physical blocks (together with a_bn's physical block)
1750 * a_runb - where to return the "run before" a_bn.
1753 msdosfs_bmap(struct vop_bmap_args *ap)
1757 struct msdosfsmount *pmp;
1761 int bnpercn, error, maxio, maxrun, run;
1766 if (ap->a_bop != NULL)
1767 *ap->a_bop = &pmp->pm_devvp->v_bufobj;
1768 if (ap->a_bnp == NULL)
1770 if (ap->a_runp != NULL)
1772 if (ap->a_runb != NULL)
1777 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL);
1778 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL))
1782 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize;
1783 bnpercn = de_cn2bn(pmp, 1);
1784 if (ap->a_runp != NULL) {
1785 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn);
1786 for (run = 1; run <= maxrun; run++) {
1787 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 ||
1788 runbn != *ap->a_bnp + run * bnpercn)
1791 *ap->a_runp = run - 1;
1793 if (ap->a_runb != NULL) {
1794 maxrun = ulmin(maxio - 1, cn);
1795 for (run = 1; run < maxrun; run++) {
1796 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 ||
1797 runbn != *ap->a_bnp - run * bnpercn)
1800 *ap->a_runb = run - 1;
1805 SYSCTL_NODE(_vfs, OID_AUTO, msdosfs, CTLFLAG_RW, 0, "msdos filesystem");
1806 static int use_buf_pager = 1;
1807 SYSCTL_INT(_vfs_msdosfs, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN,
1809 "Use buffer pager instead of bmap");
1812 msdosfs_gbp_getblkno(struct vnode *vp, vm_ooffset_t off)
1815 return (de_cluster(VTODE(vp)->de_pmp, off));
1819 msdosfs_gbp_getblksz(struct vnode *vp, daddr_t lbn)
1822 return (VTODE(vp)->de_pmp->pm_bpcluster);
1826 msdosfs_getpages(struct vop_getpages_args *ap)
1830 return (vfs_bio_getpages(ap->a_vp, ap->a_m, ap->a_count,
1831 ap->a_rbehind, ap->a_rahead, msdosfs_gbp_getblkno,
1832 msdosfs_gbp_getblksz));
1833 return (vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count,
1834 ap->a_rbehind, ap->a_rahead, NULL, NULL));
1838 msdosfs_strategy(struct vop_strategy_args *ap)
1840 struct buf *bp = ap->a_bp;
1841 struct denode *dep = VTODE(ap->a_vp);
1847 * If we don't already know the filesystem relative block number
1848 * then get it using pcbmap(). If pcbmap() returns the block
1849 * number as -1 then we've got a hole in the file. DOS filesystems
1850 * don't allow files with holes, so we shouldn't ever see this.
1852 if (bp->b_blkno == bp->b_lblkno) {
1853 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0);
1854 bp->b_blkno = blkno;
1856 bp->b_error = error;
1857 bp->b_ioflags |= BIO_ERROR;
1861 if ((long)bp->b_blkno == -1)
1864 if (bp->b_blkno == -1) {
1869 * Read/write the block from/to the disk that contains the desired
1872 bp->b_iooffset = dbtob(bp->b_blkno);
1873 bo = dep->de_pmp->pm_bo;
1874 BO_STRATEGY(bo, bp);
1879 msdosfs_print(struct vop_print_args *ap)
1881 struct denode *dep = VTODE(ap->a_vp);
1883 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ",
1884 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
1885 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev));
1890 msdosfs_pathconf(struct vop_pathconf_args *ap)
1892 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp;
1894 switch (ap->a_name) {
1899 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12;
1902 *ap->a_retval = PATH_MAX;
1904 case _PC_CHOWN_RESTRICTED:
1917 msdosfs_vptofh(struct vop_vptofh_args *ap)
1920 struct defid *defhp;
1922 dep = VTODE(ap->a_vp);
1923 defhp = (struct defid *)ap->a_fhp;
1924 defhp->defid_len = sizeof(struct defid);
1925 defhp->defid_dirclust = dep->de_dirclust;
1926 defhp->defid_dirofs = dep->de_diroffset;
1927 /* defhp->defid_gen = dep->de_gen; */
1931 /* Global vfs data structures for msdosfs */
1932 struct vop_vector msdosfs_vnodeops = {
1933 .vop_default = &default_vnodeops,
1935 .vop_access = msdosfs_access,
1936 .vop_bmap = msdosfs_bmap,
1937 .vop_getpages = msdosfs_getpages,
1938 .vop_cachedlookup = msdosfs_lookup,
1939 .vop_open = msdosfs_open,
1940 .vop_close = msdosfs_close,
1941 .vop_create = msdosfs_create,
1942 .vop_fsync = msdosfs_fsync,
1943 .vop_fdatasync = vop_stdfdatasync_buf,
1944 .vop_getattr = msdosfs_getattr,
1945 .vop_inactive = msdosfs_inactive,
1946 .vop_link = msdosfs_link,
1947 .vop_lookup = vfs_cache_lookup,
1948 .vop_mkdir = msdosfs_mkdir,
1949 .vop_mknod = msdosfs_mknod,
1950 .vop_pathconf = msdosfs_pathconf,
1951 .vop_print = msdosfs_print,
1952 .vop_read = msdosfs_read,
1953 .vop_readdir = msdosfs_readdir,
1954 .vop_reclaim = msdosfs_reclaim,
1955 .vop_remove = msdosfs_remove,
1956 .vop_rename = msdosfs_rename,
1957 .vop_rmdir = msdosfs_rmdir,
1958 .vop_setattr = msdosfs_setattr,
1959 .vop_strategy = msdosfs_strategy,
1960 .vop_symlink = msdosfs_symlink,
1961 .vop_write = msdosfs_write,
1962 .vop_vptofh = msdosfs_vptofh,