1 | /* $NetBSD: msdosfs_vnops.c,v 1.96 2016/02/01 16:53:23 christos Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. |
5 | * Copyright (C) 1994, 1995, 1997 TooLs GmbH. |
6 | * All rights reserved. |
7 | * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). |
8 | * |
9 | * Redistribution and use in source and binary forms, with or without |
10 | * modification, are permitted provided that the following conditions |
11 | * are met: |
12 | * 1. Redistributions of source code must retain the above copyright |
13 | * notice, this list of conditions and the following disclaimer. |
14 | * 2. Redistributions in binary form must reproduce the above copyright |
15 | * notice, this list of conditions and the following disclaimer in the |
16 | * documentation and/or other materials provided with the distribution. |
17 | * 3. All advertising materials mentioning features or use of this software |
18 | * must display the following acknowledgement: |
19 | * This product includes software developed by TooLs GmbH. |
20 | * 4. The name of TooLs GmbH may not be used to endorse or promote products |
21 | * derived from this software without specific prior written permission. |
22 | * |
23 | * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR |
24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
26 | * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
27 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
28 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
29 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
30 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
31 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
32 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
33 | */ |
34 | /* |
35 | * Written by Paul Popelka (paulp@uts.amdahl.com) |
36 | * |
37 | * You can do anything you want with this software, just don't say you wrote |
38 | * it, and don't remove this notice. |
39 | * |
40 | * This software is provided "as is". |
41 | * |
42 | * The author supplies this software to be publicly redistributed on the |
43 | * understanding that the author is not responsible for the correct |
44 | * functioning of this software in any circumstances and is not liable for |
45 | * any damages caused by this software. |
46 | * |
47 | * October 1992 |
48 | */ |
49 | |
50 | #include <sys/cdefs.h> |
51 | __KERNEL_RCSID(0, "$NetBSD: msdosfs_vnops.c,v 1.96 2016/02/01 16:53:23 christos Exp $" ); |
52 | |
53 | #include <sys/param.h> |
54 | #include <sys/systm.h> |
55 | #include <sys/namei.h> |
56 | #include <sys/resourcevar.h> /* defines plimit structure in proc struct */ |
57 | #include <sys/kernel.h> |
58 | #include <sys/file.h> /* define FWRITE ... */ |
59 | #include <sys/stat.h> |
60 | #include <sys/buf.h> |
61 | #include <sys/proc.h> |
62 | #include <sys/mount.h> |
63 | #include <sys/fstrans.h> |
64 | #include <sys/vnode.h> |
65 | #include <sys/signalvar.h> |
66 | #include <sys/malloc.h> |
67 | #include <sys/dirent.h> |
68 | #include <sys/lockf.h> |
69 | #include <sys/kauth.h> |
70 | |
71 | #include <miscfs/genfs/genfs.h> |
72 | #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ |
73 | |
74 | #include <uvm/uvm_extern.h> |
75 | |
76 | #include <fs/msdosfs/bpb.h> |
77 | #include <fs/msdosfs/direntry.h> |
78 | #include <fs/msdosfs/denode.h> |
79 | #include <fs/msdosfs/msdosfsmount.h> |
80 | #include <fs/msdosfs/fat.h> |
81 | |
82 | /* |
83 | * Some general notes: |
84 | * |
85 | * In the ufs filesystem the inodes, superblocks, and indirect blocks are |
86 | * read/written using the vnode for the filesystem. Blocks that represent |
87 | * the contents of a file are read/written using the vnode for the file |
88 | * (including directories when they are read/written as files). This |
89 | * presents problems for the dos filesystem because data that should be in |
90 | * an inode (if dos had them) resides in the directory itself. Since we |
91 | * must update directory entries without the benefit of having the vnode |
92 | * for the directory we must use the vnode for the filesystem. This means |
93 | * that when a directory is actually read/written (via read, write, or |
94 | * readdir, or seek) we must use the vnode for the filesystem instead of |
95 | * the vnode for the directory as would happen in ufs. This is to insure we |
96 | * retrieve the correct block from the buffer cache since the hash value is |
97 | * based upon the vnode address and the desired block number. |
98 | */ |
99 | |
100 | /* |
101 | * Create a regular file. On entry the directory to contain the file being |
102 | * created is locked. We must release before we return. |
103 | */ |
104 | int |
105 | msdosfs_create(void *v) |
106 | { |
107 | struct vop_create_v3_args /* { |
108 | struct vnode *a_dvp; |
109 | struct vnode **a_vpp; |
110 | struct componentname *a_cnp; |
111 | struct vattr *a_vap; |
112 | } */ *ap = v; |
113 | struct componentname *cnp = ap->a_cnp; |
114 | struct denode ndirent; |
115 | struct denode *dep; |
116 | struct denode *pdep = VTODE(ap->a_dvp); |
117 | int error; |
118 | |
119 | #ifdef MSDOSFS_DEBUG |
120 | printf("msdosfs_create(cnp %p, vap %p\n" , cnp, ap->a_vap); |
121 | #endif |
122 | |
123 | fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED); |
124 | /* |
125 | * If this is the root directory and there is no space left we |
126 | * can't do anything. This is because the root directory can not |
127 | * change size. |
128 | */ |
129 | if (pdep->de_StartCluster == MSDOSFSROOT |
130 | && pdep->de_fndoffset >= pdep->de_FileSize) { |
131 | error = ENOSPC; |
132 | goto bad; |
133 | } |
134 | |
135 | /* |
136 | * Create a directory entry for the file, then call createde() to |
137 | * have it installed. NOTE: DOS files are always executable. We |
138 | * use the absence of the owner write bit to make the file |
139 | * readonly. |
140 | */ |
141 | memset(&ndirent, 0, sizeof(ndirent)); |
142 | if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) |
143 | goto bad; |
144 | |
145 | ndirent.de_Attributes = (ap->a_vap->va_mode & S_IWUSR) ? |
146 | ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; |
147 | ndirent.de_StartCluster = 0; |
148 | ndirent.de_FileSize = 0; |
149 | ndirent.de_dev = pdep->de_dev; |
150 | ndirent.de_devvp = pdep->de_devvp; |
151 | ndirent.de_pmp = pdep->de_pmp; |
152 | ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; |
153 | DETIMES(&ndirent, NULL, NULL, NULL, pdep->de_pmp->pm_gmtoff); |
154 | if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0) |
155 | goto bad; |
156 | fstrans_done(ap->a_dvp->v_mount); |
157 | VN_KNOTE(ap->a_dvp, NOTE_WRITE); |
158 | *ap->a_vpp = DETOV(dep); |
159 | return (0); |
160 | |
161 | bad: |
162 | fstrans_done(ap->a_dvp->v_mount); |
163 | return (error); |
164 | } |
165 | |
166 | int |
167 | msdosfs_close(void *v) |
168 | { |
169 | struct vop_close_args /* { |
170 | struct vnode *a_vp; |
171 | int a_fflag; |
172 | kauth_cred_t a_cred; |
173 | } */ *ap = v; |
174 | struct vnode *vp = ap->a_vp; |
175 | struct denode *dep = VTODE(vp); |
176 | |
177 | fstrans_start(vp->v_mount, FSTRANS_SHARED); |
178 | mutex_enter(vp->v_interlock); |
179 | if (vp->v_usecount > 1) |
180 | DETIMES(dep, NULL, NULL, NULL, dep->de_pmp->pm_gmtoff); |
181 | mutex_exit(vp->v_interlock); |
182 | fstrans_done(vp->v_mount); |
183 | return (0); |
184 | } |
185 | |
186 | static int |
187 | msdosfs_check_possible(struct vnode *vp, struct denode *dep, mode_t mode) |
188 | { |
189 | |
190 | /* |
191 | * Disallow write attempts on read-only file systems; |
192 | * unless the file is a socket, fifo, or a block or |
193 | * character device resident on the file system. |
194 | */ |
195 | if (mode & VWRITE) { |
196 | switch (vp->v_type) { |
197 | case VDIR: |
198 | case VLNK: |
199 | case VREG: |
200 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
201 | return (EROFS); |
202 | default: |
203 | break; |
204 | } |
205 | } |
206 | |
207 | return 0; |
208 | } |
209 | |
210 | static int |
211 | msdosfs_check_permitted(struct vnode *vp, struct denode *dep, mode_t mode, |
212 | kauth_cred_t cred) |
213 | { |
214 | struct msdosfsmount *pmp = dep->de_pmp; |
215 | mode_t file_mode; |
216 | |
217 | if ((dep->de_Attributes & ATTR_READONLY) == 0) |
218 | file_mode = S_IRWXU|S_IRWXG|S_IRWXO; |
219 | else |
220 | file_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; |
221 | |
222 | file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); |
223 | |
224 | return kauth_authorize_vnode(cred, KAUTH_ACCESS_ACTION(mode, |
225 | vp->v_type, file_mode), vp, NULL, genfs_can_access(vp->v_type, |
226 | file_mode, pmp->pm_uid, pmp->pm_gid, mode, cred)); |
227 | } |
228 | |
229 | int |
230 | msdosfs_access(void *v) |
231 | { |
232 | struct vop_access_args /* { |
233 | struct vnode *a_vp; |
234 | int a_mode; |
235 | kauth_cred_t a_cred; |
236 | } */ *ap = v; |
237 | struct vnode *vp = ap->a_vp; |
238 | struct denode *dep = VTODE(vp); |
239 | int error; |
240 | |
241 | error = msdosfs_check_possible(vp, dep, ap->a_mode); |
242 | if (error) |
243 | return error; |
244 | |
245 | error = msdosfs_check_permitted(vp, dep, ap->a_mode, ap->a_cred); |
246 | |
247 | return error; |
248 | } |
249 | |
250 | int |
251 | msdosfs_getattr(void *v) |
252 | { |
253 | struct vop_getattr_args /* { |
254 | struct vnode *a_vp; |
255 | struct vattr *a_vap; |
256 | kauth_cred_t a_cred; |
257 | } */ *ap = v; |
258 | struct denode *dep = VTODE(ap->a_vp); |
259 | struct msdosfsmount *pmp = dep->de_pmp; |
260 | struct vattr *vap = ap->a_vap; |
261 | mode_t mode; |
262 | u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); |
263 | ino_t fileid; |
264 | |
265 | fstrans_start(ap->a_vp->v_mount, FSTRANS_SHARED); |
266 | DETIMES(dep, NULL, NULL, NULL, pmp->pm_gmtoff); |
267 | vap->va_fsid = dep->de_dev; |
268 | /* |
269 | * The following computation of the fileid must be the same as that |
270 | * used in msdosfs_readdir() to compute d_fileno. If not, pwd |
271 | * doesn't work. |
272 | */ |
273 | if (dep->de_Attributes & ATTR_DIRECTORY) { |
274 | fileid = cntobn(pmp, (ino_t)dep->de_StartCluster) * dirsperblk; |
275 | if (dep->de_StartCluster == MSDOSFSROOT) |
276 | fileid = 1; |
277 | } else { |
278 | fileid = cntobn(pmp, (ino_t)dep->de_dirclust) * dirsperblk; |
279 | if (dep->de_dirclust == MSDOSFSROOT) |
280 | fileid = roottobn(pmp, 0) * dirsperblk; |
281 | fileid += dep->de_diroffset / sizeof(struct direntry); |
282 | } |
283 | vap->va_fileid = fileid; |
284 | if ((dep->de_Attributes & ATTR_READONLY) == 0) |
285 | mode = S_IRWXU|S_IRWXG|S_IRWXO; |
286 | else |
287 | mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; |
288 | vap->va_mode = |
289 | mode & (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); |
290 | vap->va_uid = pmp->pm_uid; |
291 | vap->va_gid = pmp->pm_gid; |
292 | vap->va_nlink = 1; |
293 | vap->va_rdev = 0; |
294 | vap->va_size = ap->a_vp->v_size; |
295 | dos2unixtime(dep->de_MDate, dep->de_MTime, 0, pmp->pm_gmtoff, |
296 | &vap->va_mtime); |
297 | if (dep->de_pmp->pm_flags & MSDOSFSMNT_LONGNAME) { |
298 | dos2unixtime(dep->de_ADate, 0, 0, pmp->pm_gmtoff, |
299 | &vap->va_atime); |
300 | dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, |
301 | pmp->pm_gmtoff, &vap->va_ctime); |
302 | } else { |
303 | vap->va_atime = vap->va_mtime; |
304 | vap->va_ctime = vap->va_mtime; |
305 | } |
306 | vap->va_flags = 0; |
307 | if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) { |
308 | vap->va_flags |= SF_ARCHIVED; |
309 | vap->va_mode |= S_ARCH1; |
310 | } |
311 | vap->va_gen = 0; |
312 | vap->va_blocksize = pmp->pm_bpcluster; |
313 | vap->va_bytes = |
314 | (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; |
315 | vap->va_type = ap->a_vp->v_type; |
316 | fstrans_done(ap->a_vp->v_mount); |
317 | return (0); |
318 | } |
319 | |
320 | int |
321 | msdosfs_setattr(void *v) |
322 | { |
323 | struct vop_setattr_args /* { |
324 | struct vnode *a_vp; |
325 | struct vattr *a_vap; |
326 | kauth_cred_t a_cred; |
327 | } */ *ap = v; |
328 | int error = 0, de_changed = 0; |
329 | struct denode *dep = VTODE(ap->a_vp); |
330 | struct msdosfsmount *pmp = dep->de_pmp; |
331 | struct vnode *vp = ap->a_vp; |
332 | struct vattr *vap = ap->a_vap; |
333 | kauth_cred_t cred = ap->a_cred; |
334 | |
335 | #ifdef MSDOSFS_DEBUG |
336 | printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n" , |
337 | ap->a_vp, vap, cred); |
338 | #endif |
339 | /* |
340 | * Note we silently ignore uid or gid changes. |
341 | */ |
342 | if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) || |
343 | (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || |
344 | (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || |
345 | (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL) || |
346 | (vap->va_uid != VNOVAL && vap->va_uid != pmp->pm_uid) || |
347 | (vap->va_gid != VNOVAL && vap->va_gid != pmp->pm_gid)) { |
348 | #ifdef MSDOSFS_DEBUG |
349 | printf("msdosfs_setattr(): returning EINVAL\n" ); |
350 | printf(" va_type %d, va_nlink %x, va_fsid %" PRIx64", va_fileid %llx\n" , |
351 | vap->va_type, vap->va_nlink, vap->va_fsid, |
352 | (unsigned long long)vap->va_fileid); |
353 | printf(" va_blocksize %lx, va_rdev %" PRIx64", va_bytes %" PRIx64", va_gen %lx\n" , |
354 | vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); |
355 | #endif |
356 | return (EINVAL); |
357 | } |
358 | /* |
359 | * Silently ignore attributes modifications on directories. |
360 | */ |
361 | if (ap->a_vp->v_type == VDIR) |
362 | return 0; |
363 | |
364 | fstrans_start(vp->v_mount, FSTRANS_SHARED); |
365 | if (vap->va_size != VNOVAL) { |
366 | if (vp->v_mount->mnt_flag & MNT_RDONLY) { |
367 | error = EROFS; |
368 | goto bad; |
369 | } |
370 | error = detrunc(dep, (u_long)vap->va_size, 0, cred); |
371 | if (error) |
372 | goto bad; |
373 | de_changed = 1; |
374 | } |
375 | if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { |
376 | if (vp->v_mount->mnt_flag & MNT_RDONLY) { |
377 | error = EROFS; |
378 | goto bad; |
379 | } |
380 | error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_TIMES, |
381 | ap->a_vp, NULL, genfs_can_chtimes(ap->a_vp, vap->va_vaflags, |
382 | pmp->pm_uid, cred)); |
383 | if (error) |
384 | goto bad; |
385 | if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && |
386 | vap->va_atime.tv_sec != VNOVAL) |
387 | unix2dostime(&vap->va_atime, pmp->pm_gmtoff, &dep->de_ADate, NULL, NULL); |
388 | if (vap->va_mtime.tv_sec != VNOVAL) |
389 | unix2dostime(&vap->va_mtime, pmp->pm_gmtoff, &dep->de_MDate, &dep->de_MTime, NULL); |
390 | dep->de_Attributes |= ATTR_ARCHIVE; |
391 | dep->de_flag |= DE_MODIFIED; |
392 | de_changed = 1; |
393 | } |
394 | /* |
395 | * DOS files only have the ability to have their writability |
396 | * attribute set, so we use the owner write bit to set the readonly |
397 | * attribute. |
398 | */ |
399 | if (vap->va_mode != (mode_t)VNOVAL) { |
400 | if (vp->v_mount->mnt_flag & MNT_RDONLY) { |
401 | error = EROFS; |
402 | goto bad; |
403 | } |
404 | error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_FLAGS, vp, |
405 | NULL, genfs_can_chflags(cred, vp->v_type, pmp->pm_uid, false)); |
406 | if (error) |
407 | goto bad; |
408 | /* We ignore the read and execute bits. */ |
409 | if (vap->va_mode & S_IWUSR) |
410 | dep->de_Attributes &= ~ATTR_READONLY; |
411 | else |
412 | dep->de_Attributes |= ATTR_READONLY; |
413 | dep->de_flag |= DE_MODIFIED; |
414 | de_changed = 1; |
415 | } |
416 | /* |
417 | * Allow the `archived' bit to be toggled. |
418 | */ |
419 | if (vap->va_flags != VNOVAL) { |
420 | if (vp->v_mount->mnt_flag & MNT_RDONLY) { |
421 | error = EROFS; |
422 | goto bad; |
423 | } |
424 | error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_FLAGS, vp, |
425 | NULL, genfs_can_chflags(cred, vp->v_type, pmp->pm_uid, false)); |
426 | if (error) |
427 | goto bad; |
428 | if (vap->va_flags & SF_ARCHIVED) |
429 | dep->de_Attributes &= ~ATTR_ARCHIVE; |
430 | else |
431 | dep->de_Attributes |= ATTR_ARCHIVE; |
432 | dep->de_flag |= DE_MODIFIED; |
433 | de_changed = 1; |
434 | } |
435 | |
436 | if (de_changed) { |
437 | VN_KNOTE(vp, NOTE_ATTRIB); |
438 | error = deupdat(dep, 1); |
439 | if (error) |
440 | goto bad; |
441 | } |
442 | |
443 | bad: |
444 | fstrans_done(vp->v_mount); |
445 | return error; |
446 | } |
447 | |
448 | int |
449 | msdosfs_read(void *v) |
450 | { |
451 | struct vop_read_args /* { |
452 | struct vnode *a_vp; |
453 | struct uio *a_uio; |
454 | int a_ioflag; |
455 | kauth_cred_t a_cred; |
456 | } */ *ap = v; |
457 | int error = 0; |
458 | int64_t diff; |
459 | int blsize; |
460 | long n; |
461 | long on; |
462 | daddr_t lbn; |
463 | vsize_t bytelen; |
464 | struct buf *bp; |
465 | struct vnode *vp = ap->a_vp; |
466 | struct denode *dep = VTODE(vp); |
467 | struct msdosfsmount *pmp = dep->de_pmp; |
468 | struct uio *uio = ap->a_uio; |
469 | |
470 | /* |
471 | * If they didn't ask for any data, then we are done. |
472 | */ |
473 | |
474 | if (uio->uio_resid == 0) |
475 | return (0); |
476 | if (uio->uio_offset < 0) |
477 | return (EINVAL); |
478 | if (uio->uio_offset >= dep->de_FileSize) |
479 | return (0); |
480 | |
481 | fstrans_start(vp->v_mount, FSTRANS_SHARED); |
482 | if (vp->v_type == VREG) { |
483 | const int advice = IO_ADV_DECODE(ap->a_ioflag); |
484 | |
485 | while (uio->uio_resid > 0) { |
486 | bytelen = MIN(dep->de_FileSize - uio->uio_offset, |
487 | uio->uio_resid); |
488 | |
489 | if (bytelen == 0) |
490 | break; |
491 | error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice, |
492 | UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); |
493 | if (error) |
494 | break; |
495 | } |
496 | dep->de_flag |= DE_ACCESS; |
497 | goto out; |
498 | } |
499 | |
500 | /* this loop is only for directories now */ |
501 | do { |
502 | lbn = de_cluster(pmp, uio->uio_offset); |
503 | on = uio->uio_offset & pmp->pm_crbomask; |
504 | n = MIN(pmp->pm_bpcluster - on, uio->uio_resid); |
505 | if (uio->uio_offset >= dep->de_FileSize) { |
506 | fstrans_done(vp->v_mount); |
507 | return (0); |
508 | } |
509 | /* file size (and hence diff) may be up to 4GB */ |
510 | diff = dep->de_FileSize - uio->uio_offset; |
511 | if (diff < n) |
512 | n = (long) diff; |
513 | |
514 | /* convert cluster # to sector # */ |
515 | error = pcbmap(dep, lbn, &lbn, 0, &blsize); |
516 | if (error) |
517 | goto bad; |
518 | |
519 | /* |
520 | * If we are operating on a directory file then be sure to |
521 | * do i/o with the vnode for the filesystem instead of the |
522 | * vnode for the directory. |
523 | */ |
524 | error = bread(pmp->pm_devvp, de_bn2kb(pmp, lbn), blsize, |
525 | 0, &bp); |
526 | if (error) { |
527 | goto bad; |
528 | } |
529 | n = MIN(n, pmp->pm_bpcluster - bp->b_resid); |
530 | error = uiomove((char *)bp->b_data + on, (int) n, uio); |
531 | brelse(bp, 0); |
532 | } while (error == 0 && uio->uio_resid > 0 && n != 0); |
533 | |
534 | out: |
535 | if ((ap->a_ioflag & IO_SYNC) == IO_SYNC) { |
536 | int uerror; |
537 | |
538 | uerror = deupdat(dep, 1); |
539 | if (error == 0) |
540 | error = uerror; |
541 | } |
542 | bad: |
543 | fstrans_done(vp->v_mount); |
544 | return (error); |
545 | } |
546 | |
547 | /* |
548 | * Write data to a file or directory. |
549 | */ |
550 | int |
551 | msdosfs_write(void *v) |
552 | { |
553 | struct vop_write_args /* { |
554 | struct vnode *a_vp; |
555 | struct uio *a_uio; |
556 | int a_ioflag; |
557 | kauth_cred_t a_cred; |
558 | } */ *ap = v; |
559 | int resid, extended = 0; |
560 | int error = 0; |
561 | int ioflag = ap->a_ioflag; |
562 | u_long osize; |
563 | u_long count; |
564 | vsize_t bytelen; |
565 | off_t oldoff; |
566 | size_t rem; |
567 | struct uio *uio = ap->a_uio; |
568 | struct vnode *vp = ap->a_vp; |
569 | struct denode *dep = VTODE(vp); |
570 | struct msdosfsmount *pmp = dep->de_pmp; |
571 | kauth_cred_t cred = ap->a_cred; |
572 | bool async; |
573 | |
574 | #ifdef MSDOSFS_DEBUG |
575 | printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n" , |
576 | vp, uio, ioflag, cred); |
577 | printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n" , |
578 | dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); |
579 | #endif |
580 | |
581 | switch (vp->v_type) { |
582 | case VREG: |
583 | if (ioflag & IO_APPEND) |
584 | uio->uio_offset = dep->de_FileSize; |
585 | break; |
586 | case VDIR: |
587 | return EISDIR; |
588 | default: |
589 | panic("msdosfs_write(): bad file type" ); |
590 | } |
591 | |
592 | if (uio->uio_offset < 0) |
593 | return (EINVAL); |
594 | |
595 | if (uio->uio_resid == 0) |
596 | return (0); |
597 | |
598 | /* Don't bother to try to write files larger than the fs limit */ |
599 | if (uio->uio_offset + uio->uio_resid > MSDOSFS_FILESIZE_MAX) |
600 | return (EFBIG); |
601 | |
602 | fstrans_start(vp->v_mount, FSTRANS_SHARED); |
603 | /* |
604 | * If the offset we are starting the write at is beyond the end of |
605 | * the file, then they've done a seek. Unix filesystems allow |
606 | * files with holes in them, DOS doesn't so we must fill the hole |
607 | * with zeroed blocks. |
608 | */ |
609 | if (uio->uio_offset > dep->de_FileSize) { |
610 | if ((error = deextend(dep, uio->uio_offset, cred)) != 0) { |
611 | fstrans_done(vp->v_mount); |
612 | return (error); |
613 | } |
614 | } |
615 | |
616 | /* |
617 | * Remember some values in case the write fails. |
618 | */ |
619 | async = vp->v_mount->mnt_flag & MNT_ASYNC; |
620 | resid = uio->uio_resid; |
621 | osize = dep->de_FileSize; |
622 | |
623 | /* |
624 | * If we write beyond the end of the file, extend it to its ultimate |
625 | * size ahead of the time to hopefully get a contiguous area. |
626 | */ |
627 | if (uio->uio_offset + resid > osize) { |
628 | count = de_clcount(pmp, uio->uio_offset + resid) - |
629 | de_clcount(pmp, osize); |
630 | if ((error = extendfile(dep, count, NULL, NULL, 0))) |
631 | goto errexit; |
632 | |
633 | dep->de_FileSize = uio->uio_offset + resid; |
634 | /* hint uvm to not read in extended part */ |
635 | uvm_vnp_setwritesize(vp, dep->de_FileSize); |
636 | /* zero out the remainder of the last page */ |
637 | rem = round_page(dep->de_FileSize) - dep->de_FileSize; |
638 | if (rem > 0) |
639 | ubc_zerorange(&vp->v_uobj, (off_t)dep->de_FileSize, |
640 | rem, UBC_UNMAP_FLAG(vp)); |
641 | extended = 1; |
642 | } |
643 | |
644 | do { |
645 | oldoff = uio->uio_offset; |
646 | bytelen = uio->uio_resid; |
647 | |
648 | error = ubc_uiomove(&vp->v_uobj, uio, bytelen, |
649 | IO_ADV_DECODE(ioflag), UBC_WRITE | UBC_UNMAP_FLAG(vp)); |
650 | if (error) |
651 | break; |
652 | |
653 | /* |
654 | * flush what we just wrote if necessary. |
655 | * XXXUBC simplistic async flushing. |
656 | */ |
657 | |
658 | if (!async && oldoff >> 16 != uio->uio_offset >> 16) { |
659 | mutex_enter(vp->v_interlock); |
660 | error = VOP_PUTPAGES(vp, (oldoff >> 16) << 16, |
661 | (uio->uio_offset >> 16) << 16, |
662 | PGO_CLEANIT | PGO_LAZY); |
663 | } |
664 | } while (error == 0 && uio->uio_resid > 0); |
665 | |
666 | /* set final size */ |
667 | uvm_vnp_setsize(vp, dep->de_FileSize); |
668 | if (error == 0 && ioflag & IO_SYNC) { |
669 | mutex_enter(vp->v_interlock); |
670 | error = VOP_PUTPAGES(vp, trunc_page(oldoff), |
671 | round_page(oldoff + bytelen), PGO_CLEANIT | PGO_SYNCIO); |
672 | } |
673 | dep->de_flag |= DE_UPDATE; |
674 | |
675 | /* |
676 | * If the write failed and they want us to, truncate the file back |
677 | * to the size it was before the write was attempted. |
678 | */ |
679 | errexit: |
680 | if (resid > uio->uio_resid) |
681 | VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0)); |
682 | if (error) { |
683 | detrunc(dep, osize, ioflag & IO_SYNC, NOCRED); |
684 | uio->uio_offset -= resid - uio->uio_resid; |
685 | uio->uio_resid = resid; |
686 | } else if ((ioflag & IO_SYNC) == IO_SYNC) |
687 | error = deupdat(dep, 1); |
688 | fstrans_done(vp->v_mount); |
689 | KASSERT(vp->v_size == dep->de_FileSize); |
690 | return (error); |
691 | } |
692 | |
693 | int |
694 | msdosfs_update(struct vnode *vp, const struct timespec *acc, |
695 | const struct timespec *mod, int flags) |
696 | { |
697 | struct buf *bp; |
698 | struct direntry *dirp; |
699 | struct denode *dep; |
700 | int error; |
701 | |
702 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
703 | return (0); |
704 | dep = VTODE(vp); |
705 | DETIMES(dep, acc, mod, NULL, dep->de_pmp->pm_gmtoff); |
706 | if ((dep->de_flag & DE_MODIFIED) == 0) |
707 | return (0); |
708 | dep->de_flag &= ~DE_MODIFIED; |
709 | if (dep->de_Attributes & ATTR_DIRECTORY) |
710 | return (0); |
711 | if (dep->de_refcnt <= 0) |
712 | return (0); |
713 | error = readde(dep, &bp, &dirp); |
714 | if (error) |
715 | return (error); |
716 | DE_EXTERNALIZE(dirp, dep); |
717 | if (flags & (UPDATE_WAIT|UPDATE_DIROP)) |
718 | return (bwrite(bp)); |
719 | else { |
720 | bdwrite(bp); |
721 | return (0); |
722 | } |
723 | } |
724 | |
725 | /* |
726 | * Flush the blocks of a file to disk. |
727 | * |
728 | * This function is worthless for vnodes that represent directories. Maybe we |
729 | * could just do a sync if they try an fsync on a directory file. |
730 | */ |
731 | int |
732 | msdosfs_remove(void *v) |
733 | { |
734 | struct vop_remove_args /* { |
735 | struct vnode *a_dvp; |
736 | struct vnode *a_vp; |
737 | struct componentname *a_cnp; |
738 | } */ *ap = v; |
739 | struct denode *dep = VTODE(ap->a_vp); |
740 | struct denode *ddep = VTODE(ap->a_dvp); |
741 | int error; |
742 | |
743 | fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED); |
744 | if (ap->a_vp->v_type == VDIR) |
745 | error = EPERM; |
746 | else |
747 | error = removede(ddep, dep); |
748 | #ifdef MSDOSFS_DEBUG |
749 | printf("msdosfs_remove(), dep %p, v_usecount %d\n" , |
750 | dep, ap->a_vp->v_usecount); |
751 | #endif |
752 | VN_KNOTE(ap->a_vp, NOTE_DELETE); |
753 | VN_KNOTE(ap->a_dvp, NOTE_WRITE); |
754 | if (ddep == dep) |
755 | vrele(ap->a_vp); |
756 | else |
757 | vput(ap->a_vp); /* causes msdosfs_inactive() to be called |
758 | * via vrele() */ |
759 | vput(ap->a_dvp); |
760 | fstrans_done(ap->a_dvp->v_mount); |
761 | return (error); |
762 | } |
763 | |
764 | /* |
765 | * Renames on files require moving the denode to a new hash queue since the |
766 | * denode's location is used to compute which hash queue to put the file |
767 | * in. Unless it is a rename in place. For example "mv a b". |
768 | * |
769 | * What follows is the basic algorithm: |
770 | * |
771 | * if (file move) { |
772 | * if (dest file exists) { |
773 | * remove dest file |
774 | * } |
775 | * if (dest and src in same directory) { |
776 | * rewrite name in existing directory slot |
777 | * } else { |
778 | * write new entry in dest directory |
779 | * update offset and dirclust in denode |
780 | * move denode to new hash chain |
781 | * clear old directory entry |
782 | * } |
783 | * } else { |
784 | * directory move |
785 | * if (dest directory exists) { |
786 | * if (dest is not empty) { |
787 | * return ENOTEMPTY |
788 | * } |
789 | * remove dest directory |
790 | * } |
791 | * if (dest and src in same directory) { |
792 | * rewrite name in existing entry |
793 | * } else { |
794 | * be sure dest is not a child of src directory |
795 | * write entry in dest directory |
796 | * update "." and ".." in moved directory |
797 | * update offset and dirclust in denode |
798 | * move denode to new hash chain |
799 | * clear old directory entry for moved directory |
800 | * } |
801 | * } |
802 | * |
803 | * On entry: |
804 | * source's parent directory is unlocked |
805 | * source file or directory is unlocked |
806 | * destination's parent directory is locked |
807 | * destination file or directory is locked if it exists |
808 | * |
809 | * On exit: |
810 | * all denodes should be released |
811 | * |
812 | * Notes: |
813 | * I'm not sure how the memory containing the pathnames pointed at by the |
814 | * componentname structures is freed, there may be some memory bleeding |
815 | * for each rename done. |
816 | * |
817 | * --More-- Notes: |
818 | * This routine needs help. badly. |
819 | */ |
820 | int |
821 | msdosfs_rename(void *v) |
822 | { |
823 | struct vop_rename_args /* { |
824 | struct vnode *a_fdvp; |
825 | struct vnode *a_fvp; |
826 | struct componentname *a_fcnp; |
827 | struct vnode *a_tdvp; |
828 | struct vnode *a_tvp; |
829 | struct componentname *a_tcnp; |
830 | } */ *ap = v; |
831 | struct vnode *tvp = ap->a_tvp; |
832 | struct vnode *tdvp = ap->a_tdvp; |
833 | struct vnode *fvp = ap->a_fvp; |
834 | struct vnode *fdvp = ap->a_fdvp; |
835 | struct mount *mp = fdvp->v_mount; |
836 | struct componentname *tcnp = ap->a_tcnp; |
837 | struct componentname *fcnp = ap->a_fcnp; |
838 | struct denode *ip, *xp, *dp, *zp; |
839 | u_char toname[12], oldname[12]; |
840 | u_long from_diroffset, to_diroffset; |
841 | u_char to_count; |
842 | int doingdirectory = 0, newparent = 0; |
843 | int error; |
844 | u_long cn; |
845 | daddr_t bn; |
846 | struct msdosfsmount *pmp; |
847 | struct direntry *dotdotp; |
848 | struct buf *bp; |
849 | |
850 | pmp = VFSTOMSDOSFS(fdvp->v_mount); |
851 | |
852 | /* |
853 | * Check for cross-device rename. |
854 | */ |
855 | if ((fvp->v_mount != tdvp->v_mount) || |
856 | (tvp && (fvp->v_mount != tvp->v_mount))) { |
857 | error = EXDEV; |
858 | abortit: |
859 | VOP_ABORTOP(tdvp, tcnp); |
860 | if (tdvp == tvp) |
861 | vrele(tdvp); |
862 | else |
863 | vput(tdvp); |
864 | if (tvp) |
865 | vput(tvp); |
866 | VOP_ABORTOP(fdvp, fcnp); |
867 | vrele(fdvp); |
868 | vrele(fvp); |
869 | return (error); |
870 | } |
871 | |
872 | /* |
873 | * If source and dest are the same, do nothing. |
874 | */ |
875 | if (tvp == fvp) { |
876 | error = 0; |
877 | goto abortit; |
878 | } |
879 | |
880 | /* |
881 | * XXX: This can deadlock since we hold tdvp/tvp locked. |
882 | * But I'm not going to fix it now. |
883 | */ |
884 | if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) |
885 | goto abortit; |
886 | dp = VTODE(fdvp); |
887 | ip = VTODE(fvp); |
888 | |
889 | /* |
890 | * Be sure we are not renaming ".", "..", or an alias of ".". This |
891 | * leads to a crippled directory tree. It's pretty tough to do a |
892 | * "ls" or "pwd" with the "." directory entry missing, and "cd .." |
893 | * doesn't work if the ".." entry is missing. |
894 | */ |
895 | if (ip->de_Attributes & ATTR_DIRECTORY) { |
896 | /* |
897 | * Avoid ".", "..", and aliases of "." for obvious reasons. |
898 | */ |
899 | if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || |
900 | dp == ip || |
901 | (fcnp->cn_flags & ISDOTDOT) || |
902 | (tcnp->cn_flags & ISDOTDOT) || |
903 | (ip->de_flag & DE_RENAME)) { |
904 | VOP_UNLOCK(fvp); |
905 | error = EINVAL; |
906 | goto abortit; |
907 | } |
908 | ip->de_flag |= DE_RENAME; |
909 | doingdirectory++; |
910 | } |
911 | VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ |
912 | |
913 | fstrans_start(mp, FSTRANS_SHARED); |
914 | /* |
915 | * When the target exists, both the directory |
916 | * and target vnodes are returned locked. |
917 | */ |
918 | dp = VTODE(tdvp); |
919 | xp = tvp ? VTODE(tvp) : NULL; |
920 | /* |
921 | * Remember direntry place to use for destination |
922 | */ |
923 | to_diroffset = dp->de_fndoffset; |
924 | to_count = dp->de_fndcnt; |
925 | |
926 | /* |
927 | * If ".." must be changed (ie the directory gets a new |
928 | * parent) then the source directory must not be in the |
929 | * directory hierarchy above the target, as this would |
930 | * orphan everything below the source directory. Also |
931 | * the user must have write permission in the source so |
932 | * as to be able to change "..". We must repeat the call |
933 | * to namei, as the parent directory is unlocked by the |
934 | * call to doscheckpath(). |
935 | */ |
936 | error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred); |
937 | VOP_UNLOCK(fvp); |
938 | if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) |
939 | newparent = 1; |
940 | |
941 | if (doingdirectory && newparent) { |
942 | if (error) /* write access check above */ |
943 | goto tdvpbad; |
944 | if (xp != NULL) |
945 | vput(tvp); |
946 | tvp = NULL; |
947 | /* |
948 | * doscheckpath() vput()'s tdvp (dp == VTODE(tdvp)), |
949 | * so we have to get an extra ref to it first, and |
950 | * because it's been unlocked we need to do a relookup |
951 | * afterwards in case tvp has changed. |
952 | */ |
953 | vref(tdvp); |
954 | if ((error = doscheckpath(ip, dp)) != 0) |
955 | goto bad; |
956 | vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY); |
957 | if ((error = relookup(tdvp, &tvp, tcnp, 0)) != 0) { |
958 | VOP_UNLOCK(tdvp); |
959 | goto bad; |
960 | } |
961 | dp = VTODE(tdvp); |
962 | xp = tvp ? VTODE(tvp) : NULL; |
963 | } |
964 | |
965 | if (xp != NULL) { |
966 | /* |
967 | * Target must be empty if a directory and have no links |
968 | * to it. Also, ensure source and target are compatible |
969 | * (both directories, or both not directories). |
970 | */ |
971 | if (xp->de_Attributes & ATTR_DIRECTORY) { |
972 | if (!dosdirempty(xp)) { |
973 | error = ENOTEMPTY; |
974 | goto tdvpbad; |
975 | } |
976 | if (!doingdirectory) { |
977 | error = ENOTDIR; |
978 | goto tdvpbad; |
979 | } |
980 | } else if (doingdirectory) { |
981 | error = EISDIR; |
982 | goto tdvpbad; |
983 | } |
984 | if ((error = removede(dp, xp)) != 0) |
985 | goto tdvpbad; |
986 | VN_KNOTE(tdvp, NOTE_WRITE); |
987 | VN_KNOTE(tvp, NOTE_DELETE); |
988 | cache_purge(tvp); |
989 | vput(tvp); |
990 | tvp = NULL; |
991 | xp = NULL; |
992 | } |
993 | |
994 | /* |
995 | * Convert the filename in tcnp into a dos filename. We copy this |
996 | * into the denode and directory entry for the destination |
997 | * file/directory. |
998 | */ |
999 | if ((error = uniqdosname(VTODE(tdvp), tcnp, toname)) != 0) { |
1000 | fstrans_done(mp); |
1001 | goto abortit; |
1002 | } |
1003 | |
1004 | /* |
1005 | * Since from wasn't locked at various places above, |
1006 | * have to do a relookup here. |
1007 | */ |
1008 | fcnp->cn_flags &= ~MODMASK; |
1009 | fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; |
1010 | VOP_UNLOCK(tdvp); |
1011 | vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); |
1012 | if ((error = relookup(fdvp, &fvp, fcnp, 0))) { |
1013 | VOP_UNLOCK(fdvp); |
1014 | vrele(ap->a_fvp); |
1015 | vrele(tdvp); |
1016 | fstrans_done(mp); |
1017 | return (error); |
1018 | } |
1019 | if (fvp == NULL) { |
1020 | /* |
1021 | * From name has disappeared. |
1022 | */ |
1023 | if (doingdirectory) |
1024 | panic("rename: lost dir entry" ); |
1025 | vput(fdvp); |
1026 | vrele(ap->a_fvp); |
1027 | vrele(tdvp); |
1028 | fstrans_done(mp); |
1029 | return 0; |
1030 | } |
1031 | VOP_UNLOCK(fdvp); |
1032 | xp = VTODE(fvp); |
1033 | zp = VTODE(fdvp); |
1034 | from_diroffset = zp->de_fndoffset; |
1035 | |
1036 | /* |
1037 | * Ensure that the directory entry still exists and has not |
1038 | * changed till now. If the source is a file the entry may |
1039 | * have been unlinked or renamed. In either case there is |
1040 | * no further work to be done. If the source is a directory |
1041 | * then it cannot have been rmdir'ed or renamed; this is |
1042 | * prohibited by the DE_RENAME flag. |
1043 | */ |
1044 | if (xp != ip) { |
1045 | if (doingdirectory) |
1046 | panic("rename: lost dir entry" ); |
1047 | vrele(ap->a_fvp); |
1048 | xp = NULL; |
1049 | } else { |
1050 | vrele(fvp); |
1051 | xp = NULL; |
1052 | |
1053 | /* |
1054 | * First write a new entry in the destination |
1055 | * directory and mark the entry in the source directory |
1056 | * as deleted. Then move the denode to the correct hash |
1057 | * chain for its new location in the filesystem. And, if |
1058 | * we moved a directory, then update its .. entry to point |
1059 | * to the new parent directory. |
1060 | */ |
1061 | memcpy(oldname, ip->de_Name, 11); |
1062 | memcpy(ip->de_Name, toname, 11); /* update denode */ |
1063 | dp->de_fndoffset = to_diroffset; |
1064 | dp->de_fndcnt = to_count; |
1065 | error = createde(ip, dp, (struct denode **)0, tcnp); |
1066 | if (error) { |
1067 | memcpy(ip->de_Name, oldname, 11); |
1068 | VOP_UNLOCK(fvp); |
1069 | goto bad; |
1070 | } |
1071 | ip->de_refcnt++; |
1072 | zp->de_fndoffset = from_diroffset; |
1073 | if ((error = removede(zp, ip)) != 0) { |
1074 | /* XXX should really panic here, fs is corrupt */ |
1075 | VOP_UNLOCK(fvp); |
1076 | goto bad; |
1077 | } |
1078 | cache_purge(fvp); |
1079 | if (!doingdirectory) { |
1080 | struct denode_key old_key = ip->de_key; |
1081 | struct denode_key new_key = ip->de_key; |
1082 | |
1083 | error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, |
1084 | &new_key.dk_dirclust, 0); |
1085 | if (error) { |
1086 | /* XXX should really panic here, fs is corrupt */ |
1087 | VOP_UNLOCK(fvp); |
1088 | goto bad; |
1089 | } |
1090 | new_key.dk_diroffset = to_diroffset; |
1091 | if (new_key.dk_dirclust != MSDOSFSROOT) |
1092 | new_key.dk_diroffset &= pmp->pm_crbomask; |
1093 | vcache_rekey_enter(pmp->pm_mountp, fvp, &old_key, |
1094 | sizeof(old_key), &new_key, sizeof(new_key)); |
1095 | ip->de_key = new_key; |
1096 | vcache_rekey_exit(pmp->pm_mountp, fvp, &old_key, |
1097 | sizeof(old_key), &ip->de_key, sizeof(ip->de_key)); |
1098 | } |
1099 | } |
1100 | |
1101 | /* |
1102 | * If we moved a directory to a new parent directory, then we must |
1103 | * fixup the ".." entry in the moved directory. |
1104 | */ |
1105 | if (doingdirectory && newparent) { |
1106 | cn = ip->de_StartCluster; |
1107 | if (cn == MSDOSFSROOT) { |
1108 | /* this should never happen */ |
1109 | panic("msdosfs_rename: updating .. in root directory?" ); |
1110 | } else |
1111 | bn = cntobn(pmp, cn); |
1112 | error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), |
1113 | pmp->pm_bpcluster, B_MODIFY, &bp); |
1114 | if (error) { |
1115 | /* XXX should really panic here, fs is corrupt */ |
1116 | VOP_UNLOCK(fvp); |
1117 | goto bad; |
1118 | } |
1119 | dotdotp = (struct direntry *)bp->b_data + 1; |
1120 | putushort(dotdotp->deStartCluster, dp->de_StartCluster); |
1121 | if (FAT32(pmp)) { |
1122 | putushort(dotdotp->deHighClust, |
1123 | dp->de_StartCluster >> 16); |
1124 | } else { |
1125 | putushort(dotdotp->deHighClust, 0); |
1126 | } |
1127 | if ((error = bwrite(bp)) != 0) { |
1128 | /* XXX should really panic here, fs is corrupt */ |
1129 | VOP_UNLOCK(fvp); |
1130 | goto bad; |
1131 | } |
1132 | } |
1133 | |
1134 | VN_KNOTE(fvp, NOTE_RENAME); |
1135 | VOP_UNLOCK(fvp); |
1136 | bad: |
1137 | if (tvp) |
1138 | vput(tvp); |
1139 | vrele(tdvp); |
1140 | ip->de_flag &= ~DE_RENAME; |
1141 | vrele(fdvp); |
1142 | vrele(fvp); |
1143 | fstrans_done(mp); |
1144 | return (error); |
1145 | |
1146 | /* XXX: uuuh */ |
1147 | tdvpbad: |
1148 | VOP_UNLOCK(tdvp); |
1149 | goto bad; |
1150 | } |
1151 | |
1152 | static const struct { |
1153 | struct direntry dot; |
1154 | struct direntry dotdot; |
1155 | } dosdirtemplate = { |
1156 | { ". " , " " , /* the . entry */ |
1157 | ATTR_DIRECTORY, /* file attribute */ |
1158 | 0, /* reserved */ |
1159 | 0, { 0, 0 }, { 0, 0 }, /* create time & date */ |
1160 | { 0, 0 }, /* access date */ |
1161 | { 0, 0 }, /* high bits of start cluster */ |
1162 | { 210, 4 }, { 210, 4 }, /* modify time & date */ |
1163 | { 0, 0 }, /* startcluster */ |
1164 | { 0, 0, 0, 0 } /* filesize */ |
1165 | }, |
1166 | { ".. " , " " , /* the .. entry */ |
1167 | ATTR_DIRECTORY, /* file attribute */ |
1168 | 0, /* reserved */ |
1169 | 0, { 0, 0 }, { 0, 0 }, /* create time & date */ |
1170 | { 0, 0 }, /* access date */ |
1171 | { 0, 0 }, /* high bits of start cluster */ |
1172 | { 210, 4 }, { 210, 4 }, /* modify time & date */ |
1173 | { 0, 0 }, /* startcluster */ |
1174 | { 0, 0, 0, 0 } /* filesize */ |
1175 | } |
1176 | }; |
1177 | |
1178 | int |
1179 | msdosfs_mkdir(void *v) |
1180 | { |
1181 | struct vop_mkdir_v3_args /* { |
1182 | struct vnode *a_dvp; |
1183 | struvt vnode **a_vpp; |
1184 | struvt componentname *a_cnp; |
1185 | struct vattr *a_vap; |
1186 | } */ *ap = v; |
1187 | struct componentname *cnp = ap->a_cnp; |
1188 | struct denode ndirent; |
1189 | struct denode *dep; |
1190 | struct denode *pdep = VTODE(ap->a_dvp); |
1191 | int error; |
1192 | int bn; |
1193 | u_long newcluster, pcl; |
1194 | daddr_t lbn; |
1195 | struct direntry *denp; |
1196 | struct msdosfsmount *pmp = pdep->de_pmp; |
1197 | struct buf *bp; |
1198 | int async = pdep->de_pmp->pm_mountp->mnt_flag & MNT_ASYNC; |
1199 | |
1200 | fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED); |
1201 | /* |
1202 | * If this is the root directory and there is no space left we |
1203 | * can't do anything. This is because the root directory can not |
1204 | * change size. |
1205 | */ |
1206 | if (pdep->de_StartCluster == MSDOSFSROOT |
1207 | && pdep->de_fndoffset >= pdep->de_FileSize) { |
1208 | error = ENOSPC; |
1209 | goto bad2; |
1210 | } |
1211 | |
1212 | /* |
1213 | * Allocate a cluster to hold the about to be created directory. |
1214 | */ |
1215 | error = clusteralloc(pmp, 0, 1, &newcluster, NULL); |
1216 | if (error) |
1217 | goto bad2; |
1218 | |
1219 | memset(&ndirent, 0, sizeof(ndirent)); |
1220 | ndirent.de_pmp = pmp; |
1221 | ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; |
1222 | DETIMES(&ndirent, NULL, NULL, NULL, pmp->pm_gmtoff); |
1223 | |
1224 | /* |
1225 | * Now fill the cluster with the "." and ".." entries. And write |
1226 | * the cluster to disk. This way it is there for the parent |
1227 | * directory to be pointing at if there were a crash. |
1228 | */ |
1229 | bn = cntobn(pmp, newcluster); |
1230 | lbn = de_bn2kb(pmp, bn); |
1231 | /* always succeeds */ |
1232 | bp = getblk(pmp->pm_devvp, lbn, pmp->pm_bpcluster, 0, 0); |
1233 | memset(bp->b_data, 0, pmp->pm_bpcluster); |
1234 | memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate); |
1235 | denp = (struct direntry *)bp->b_data; |
1236 | putushort(denp[0].deStartCluster, newcluster); |
1237 | putushort(denp[0].deCDate, ndirent.de_CDate); |
1238 | putushort(denp[0].deCTime, ndirent.de_CTime); |
1239 | denp[0].deCHundredth = ndirent.de_CHun; |
1240 | putushort(denp[0].deADate, ndirent.de_ADate); |
1241 | putushort(denp[0].deMDate, ndirent.de_MDate); |
1242 | putushort(denp[0].deMTime, ndirent.de_MTime); |
1243 | pcl = pdep->de_StartCluster; |
1244 | if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) |
1245 | pcl = 0; |
1246 | putushort(denp[1].deStartCluster, pcl); |
1247 | putushort(denp[1].deCDate, ndirent.de_CDate); |
1248 | putushort(denp[1].deCTime, ndirent.de_CTime); |
1249 | denp[1].deCHundredth = ndirent.de_CHun; |
1250 | putushort(denp[1].deADate, ndirent.de_ADate); |
1251 | putushort(denp[1].deMDate, ndirent.de_MDate); |
1252 | putushort(denp[1].deMTime, ndirent.de_MTime); |
1253 | if (FAT32(pmp)) { |
1254 | putushort(denp[0].deHighClust, newcluster >> 16); |
1255 | putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); |
1256 | } else { |
1257 | putushort(denp[0].deHighClust, 0); |
1258 | putushort(denp[1].deHighClust, 0); |
1259 | } |
1260 | |
1261 | if (async) |
1262 | bdwrite(bp); |
1263 | else if ((error = bwrite(bp)) != 0) |
1264 | goto bad; |
1265 | |
1266 | /* |
1267 | * Now build up a directory entry pointing to the newly allocated |
1268 | * cluster. This will be written to an empty slot in the parent |
1269 | * directory. |
1270 | */ |
1271 | if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) |
1272 | goto bad; |
1273 | |
1274 | ndirent.de_Attributes = ATTR_DIRECTORY; |
1275 | ndirent.de_StartCluster = newcluster; |
1276 | ndirent.de_FileSize = 0; |
1277 | ndirent.de_dev = pdep->de_dev; |
1278 | ndirent.de_devvp = pdep->de_devvp; |
1279 | if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0) |
1280 | goto bad; |
1281 | VN_KNOTE(ap->a_dvp, NOTE_WRITE | NOTE_LINK); |
1282 | *ap->a_vpp = DETOV(dep); |
1283 | fstrans_done(ap->a_dvp->v_mount); |
1284 | return (0); |
1285 | |
1286 | bad: |
1287 | clusterfree(pmp, newcluster, NULL); |
1288 | bad2: |
1289 | fstrans_done(ap->a_dvp->v_mount); |
1290 | return (error); |
1291 | } |
1292 | |
1293 | int |
1294 | msdosfs_rmdir(void *v) |
1295 | { |
1296 | struct vop_rmdir_args /* { |
1297 | struct vnode *a_dvp; |
1298 | struct vnode *a_vp; |
1299 | struct componentname *a_cnp; |
1300 | } */ *ap = v; |
1301 | struct vnode *vp = ap->a_vp; |
1302 | struct vnode *dvp = ap->a_dvp; |
1303 | struct mount *mp = dvp->v_mount; |
1304 | struct componentname *cnp = ap->a_cnp; |
1305 | struct denode *ip, *dp; |
1306 | int error; |
1307 | |
1308 | ip = VTODE(vp); |
1309 | dp = VTODE(dvp); |
1310 | /* |
1311 | * No rmdir "." please. |
1312 | */ |
1313 | if (dp == ip) { |
1314 | vrele(dvp); |
1315 | vput(vp); |
1316 | return (EINVAL); |
1317 | } |
1318 | fstrans_start(mp, FSTRANS_SHARED); |
1319 | /* |
1320 | * Verify the directory is empty (and valid). |
1321 | * (Rmdir ".." won't be valid since |
1322 | * ".." will contain a reference to |
1323 | * the current directory and thus be |
1324 | * non-empty.) |
1325 | */ |
1326 | error = 0; |
1327 | if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { |
1328 | error = ENOTEMPTY; |
1329 | goto out; |
1330 | } |
1331 | /* |
1332 | * Delete the entry from the directory. For dos filesystems this |
1333 | * gets rid of the directory entry on disk, the in memory copy |
1334 | * still exists but the de_refcnt is <= 0. This prevents it from |
1335 | * being found by deget(). When the vput() on dep is done we give |
1336 | * up access and eventually msdosfs_reclaim() will be called which |
1337 | * will remove it from the denode cache. |
1338 | */ |
1339 | if ((error = removede(dp, ip)) != 0) |
1340 | goto out; |
1341 | /* |
1342 | * This is where we decrement the link count in the parent |
1343 | * directory. Since dos filesystems don't do this we just purge |
1344 | * the name cache and let go of the parent directory denode. |
1345 | */ |
1346 | VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); |
1347 | cache_purge(dvp); |
1348 | vput(dvp); |
1349 | dvp = NULL; |
1350 | /* |
1351 | * Truncate the directory that is being deleted. |
1352 | */ |
1353 | error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); |
1354 | cache_purge(vp); |
1355 | out: |
1356 | VN_KNOTE(vp, NOTE_DELETE); |
1357 | if (dvp) |
1358 | vput(dvp); |
1359 | vput(vp); |
1360 | fstrans_done(mp); |
1361 | return (error); |
1362 | } |
1363 | |
1364 | int |
1365 | msdosfs_readdir(void *v) |
1366 | { |
1367 | struct vop_readdir_args /* { |
1368 | struct vnode *a_vp; |
1369 | struct uio *a_uio; |
1370 | kauth_cred_t a_cred; |
1371 | int *a_eofflag; |
1372 | off_t **a_cookies; |
1373 | int *a_ncookies; |
1374 | } */ *ap = v; |
1375 | int error = 0; |
1376 | int diff; |
1377 | long n; |
1378 | int blsize; |
1379 | long on; |
1380 | long lost; |
1381 | long count; |
1382 | u_long cn; |
1383 | ino_t fileno; |
1384 | u_long dirsperblk; |
1385 | long bias = 0; |
1386 | daddr_t bn, lbn; |
1387 | struct buf *bp; |
1388 | struct denode *dep = VTODE(ap->a_vp); |
1389 | struct msdosfsmount *pmp = dep->de_pmp; |
1390 | struct direntry *dentp; |
1391 | struct dirent *dirbuf; |
1392 | struct uio *uio = ap->a_uio; |
1393 | off_t *cookies = NULL; |
1394 | int ncookies = 0, nc = 0; |
1395 | off_t offset, uio_off; |
1396 | int chksum = -1; |
1397 | uint16_t namlen; |
1398 | |
1399 | #ifdef MSDOSFS_DEBUG |
1400 | printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n" , |
1401 | ap->a_vp, uio, ap->a_cred, ap->a_eofflag); |
1402 | #endif |
1403 | |
1404 | /* |
1405 | * msdosfs_readdir() won't operate properly on regular files since |
1406 | * it does i/o only with the filesystem vnode, and hence can |
1407 | * retrieve the wrong block from the buffer cache for a plain file. |
1408 | * So, fail attempts to readdir() on a plain file. |
1409 | */ |
1410 | if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) |
1411 | return (ENOTDIR); |
1412 | |
1413 | /* |
1414 | * If the user buffer is smaller than the size of one dos directory |
1415 | * entry or the file offset is not a multiple of the size of a |
1416 | * directory entry, then we fail the read. |
1417 | */ |
1418 | count = uio->uio_resid & ~(sizeof(struct direntry) - 1); |
1419 | offset = uio->uio_offset; |
1420 | if (count < sizeof(struct direntry) || |
1421 | (offset & (sizeof(struct direntry) - 1))) |
1422 | return (EINVAL); |
1423 | lost = uio->uio_resid - count; |
1424 | uio->uio_resid = count; |
1425 | uio_off = uio->uio_offset; |
1426 | |
1427 | fstrans_start(ap->a_vp->v_mount, FSTRANS_SHARED); |
1428 | |
1429 | /* Allocate a temporary dirent buffer. */ |
1430 | dirbuf = malloc(sizeof(struct dirent), M_MSDOSFSTMP, M_WAITOK | M_ZERO); |
1431 | |
1432 | if (ap->a_ncookies) { |
1433 | nc = uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0); |
1434 | cookies = malloc(nc * sizeof (off_t), M_TEMP, M_WAITOK); |
1435 | *ap->a_cookies = cookies; |
1436 | } |
1437 | |
1438 | dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); |
1439 | |
1440 | /* |
1441 | * If they are reading from the root directory then, we simulate |
1442 | * the . and .. entries since these don't exist in the root |
1443 | * directory. We also set the offset bias to make up for having to |
1444 | * simulate these entries. By this I mean that at file offset 64 we |
1445 | * read the first entry in the root directory that lives on disk. |
1446 | */ |
1447 | if (dep->de_StartCluster == MSDOSFSROOT |
1448 | || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { |
1449 | #if 0 |
1450 | printf("msdosfs_readdir(): going after . or .. in root dir, " |
1451 | "offset %" PRIu64 "\n" , offset); |
1452 | #endif |
1453 | bias = 2 * sizeof(struct direntry); |
1454 | if (offset < bias) { |
1455 | for (n = (int)offset / sizeof(struct direntry); |
1456 | n < 2; n++) { |
1457 | if (FAT32(pmp)) |
1458 | dirbuf->d_fileno = cntobn(pmp, |
1459 | (ino_t)pmp->pm_rootdirblk) |
1460 | * dirsperblk; |
1461 | else |
1462 | dirbuf->d_fileno = 1; |
1463 | dirbuf->d_type = DT_DIR; |
1464 | switch (n) { |
1465 | case 0: |
1466 | dirbuf->d_namlen = 1; |
1467 | strlcpy(dirbuf->d_name, "." , |
1468 | sizeof(dirbuf->d_name)); |
1469 | break; |
1470 | case 1: |
1471 | dirbuf->d_namlen = 2; |
1472 | strlcpy(dirbuf->d_name, ".." , |
1473 | sizeof(dirbuf->d_name)); |
1474 | break; |
1475 | } |
1476 | dirbuf->d_reclen = _DIRENT_SIZE(dirbuf); |
1477 | if (uio->uio_resid < dirbuf->d_reclen) |
1478 | goto out; |
1479 | error = uiomove(dirbuf, dirbuf->d_reclen, uio); |
1480 | if (error) |
1481 | goto out; |
1482 | offset += sizeof(struct direntry); |
1483 | uio_off = offset; |
1484 | if (cookies) { |
1485 | *cookies++ = offset; |
1486 | ncookies++; |
1487 | if (ncookies >= nc) |
1488 | goto out; |
1489 | } |
1490 | } |
1491 | } |
1492 | } |
1493 | |
1494 | while (uio->uio_resid > 0) { |
1495 | lbn = de_cluster(pmp, offset - bias); |
1496 | on = (offset - bias) & pmp->pm_crbomask; |
1497 | n = MIN(pmp->pm_bpcluster - on, uio->uio_resid); |
1498 | diff = dep->de_FileSize - (offset - bias); |
1499 | if (diff <= 0) |
1500 | break; |
1501 | n = MIN(n, diff); |
1502 | if ((error = pcbmap(dep, lbn, &bn, &cn, &blsize)) != 0) |
1503 | break; |
1504 | error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), blsize, |
1505 | 0, &bp); |
1506 | if (error) { |
1507 | goto bad; |
1508 | } |
1509 | n = MIN(n, blsize - bp->b_resid); |
1510 | |
1511 | /* |
1512 | * Convert from dos directory entries to fs-independent |
1513 | * directory entries. |
1514 | */ |
1515 | for (dentp = (struct direntry *)((char *)bp->b_data + on); |
1516 | (char *)dentp < (char *)bp->b_data + on + n; |
1517 | dentp++, offset += sizeof(struct direntry)) { |
1518 | #if 0 |
1519 | |
1520 | printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n" , |
1521 | dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); |
1522 | #endif |
1523 | /* |
1524 | * If this is an unused entry, we can stop. |
1525 | */ |
1526 | if (dentp->deName[0] == SLOT_EMPTY) { |
1527 | brelse(bp, 0); |
1528 | goto out; |
1529 | } |
1530 | /* |
1531 | * Skip deleted entries. |
1532 | */ |
1533 | if (dentp->deName[0] == SLOT_DELETED) { |
1534 | chksum = -1; |
1535 | continue; |
1536 | } |
1537 | |
1538 | /* |
1539 | * Handle Win95 long directory entries |
1540 | */ |
1541 | if (dentp->deAttributes == ATTR_WIN95) { |
1542 | if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) |
1543 | continue; |
1544 | chksum = win2unixfn((struct winentry *)dentp, |
1545 | dirbuf, chksum, &namlen, |
1546 | pmp->pm_flags & MSDOSFSMNT_UTF8); |
1547 | if (chksum != -1) |
1548 | dirbuf->d_namlen = namlen; |
1549 | continue; |
1550 | } |
1551 | |
1552 | /* |
1553 | * Skip volume labels |
1554 | */ |
1555 | if (dentp->deAttributes & ATTR_VOLUME) { |
1556 | chksum = -1; |
1557 | continue; |
1558 | } |
1559 | /* |
1560 | * This computation of d_fileno must match |
1561 | * the computation of va_fileid in |
1562 | * msdosfs_getattr. |
1563 | */ |
1564 | if (dentp->deAttributes & ATTR_DIRECTORY) { |
1565 | fileno = getushort(dentp->deStartCluster); |
1566 | if (FAT32(pmp)) |
1567 | fileno |= ((ino_t)getushort(dentp->deHighClust)) << 16; |
1568 | /* if this is the root directory */ |
1569 | if (fileno == MSDOSFSROOT) |
1570 | if (FAT32(pmp)) |
1571 | fileno = cntobn(pmp, |
1572 | (ino_t)pmp->pm_rootdirblk) |
1573 | * dirsperblk; |
1574 | else |
1575 | fileno = 1; |
1576 | else |
1577 | fileno = cntobn(pmp, fileno) * dirsperblk; |
1578 | dirbuf->d_fileno = fileno; |
1579 | dirbuf->d_type = DT_DIR; |
1580 | } else { |
1581 | dirbuf->d_fileno = |
1582 | offset / sizeof(struct direntry); |
1583 | dirbuf->d_type = DT_REG; |
1584 | } |
1585 | if (chksum != winChksum(dentp->deName)) |
1586 | dirbuf->d_namlen = dos2unixfn(dentp->deName, |
1587 | (u_char *)dirbuf->d_name, |
1588 | pmp->pm_flags & MSDOSFSMNT_SHORTNAME); |
1589 | else |
1590 | dirbuf->d_name[dirbuf->d_namlen] = 0; |
1591 | namlen = dirbuf->d_namlen; |
1592 | chksum = -1; |
1593 | dirbuf->d_reclen = _DIRENT_SIZE(dirbuf); |
1594 | if (uio->uio_resid < dirbuf->d_reclen) { |
1595 | brelse(bp, 0); |
1596 | goto out; |
1597 | } |
1598 | error = uiomove(dirbuf, dirbuf->d_reclen, uio); |
1599 | if (error) { |
1600 | brelse(bp, 0); |
1601 | goto out; |
1602 | } |
1603 | uio_off = offset + sizeof(struct direntry); |
1604 | if (cookies) { |
1605 | *cookies++ = offset + sizeof(struct direntry); |
1606 | ncookies++; |
1607 | if (ncookies >= nc) { |
1608 | brelse(bp, 0); |
1609 | goto out; |
1610 | } |
1611 | } |
1612 | } |
1613 | brelse(bp, 0); |
1614 | } |
1615 | |
1616 | out: |
1617 | uio->uio_offset = uio_off; |
1618 | uio->uio_resid += lost; |
1619 | if (dep->de_FileSize - (offset - bias) <= 0) |
1620 | *ap->a_eofflag = 1; |
1621 | else |
1622 | *ap->a_eofflag = 0; |
1623 | |
1624 | if (ap->a_ncookies) { |
1625 | if (error) { |
1626 | free(*ap->a_cookies, M_TEMP); |
1627 | *ap->a_ncookies = 0; |
1628 | *ap->a_cookies = NULL; |
1629 | } else |
1630 | *ap->a_ncookies = ncookies; |
1631 | } |
1632 | |
1633 | bad: |
1634 | free(dirbuf, M_MSDOSFSTMP); |
1635 | fstrans_done(ap->a_vp->v_mount); |
1636 | return (error); |
1637 | } |
1638 | |
1639 | /* |
1640 | * vp - address of vnode file the file |
1641 | * bn - which cluster we are interested in mapping to a filesystem block number. |
1642 | * vpp - returns the vnode for the block special file holding the filesystem |
1643 | * containing the file of interest |
1644 | * bnp - address of where to return the filesystem relative block number |
1645 | */ |
1646 | int |
1647 | msdosfs_bmap(void *v) |
1648 | { |
1649 | struct vop_bmap_args /* { |
1650 | struct vnode *a_vp; |
1651 | daddr_t a_bn; |
1652 | struct vnode **a_vpp; |
1653 | daddr_t *a_bnp; |
1654 | int *a_runp; |
1655 | } */ *ap = v; |
1656 | struct denode *dep = VTODE(ap->a_vp); |
1657 | int run, maxrun; |
1658 | daddr_t runbn; |
1659 | int status; |
1660 | |
1661 | if (ap->a_vpp != NULL) |
1662 | *ap->a_vpp = dep->de_devvp; |
1663 | if (ap->a_bnp == NULL) |
1664 | return (0); |
1665 | status = pcbmap(dep, ap->a_bn, ap->a_bnp, 0, 0); |
1666 | |
1667 | /* |
1668 | * From FreeBSD: |
1669 | * A little kludgy, but we loop calling pcbmap until we |
1670 | * reach the end of the contiguous piece, or reach MAXPHYS. |
1671 | * Since it reduces disk I/Os, the "wasted" CPU is put to |
1672 | * good use (4 to 5 fold sequential read I/O improvement on USB |
1673 | * drives). |
1674 | */ |
1675 | if (ap->a_runp != NULL) { |
1676 | /* taken from ufs_bmap */ |
1677 | maxrun = ulmin(MAXPHYS / dep->de_pmp->pm_bpcluster - 1, |
1678 | dep->de_pmp->pm_maxcluster - ap->a_bn); |
1679 | for (run = 1; run <= maxrun; run++) { |
1680 | if (pcbmap(dep, ap->a_bn + run, &runbn, NULL, NULL) |
1681 | != 0 || runbn != |
1682 | *ap->a_bnp + de_cn2bn(dep->de_pmp, run)) |
1683 | break; |
1684 | } |
1685 | *ap->a_runp = run - 1; |
1686 | } |
1687 | |
1688 | /* |
1689 | * We need to scale *ap->a_bnp by sector_size/DEV_BSIZE |
1690 | */ |
1691 | *ap->a_bnp = de_bn2kb(dep->de_pmp, *ap->a_bnp); |
1692 | return status; |
1693 | } |
1694 | |
1695 | int |
1696 | msdosfs_strategy(void *v) |
1697 | { |
1698 | struct vop_strategy_args /* { |
1699 | struct vnode *a_vp; |
1700 | struct buf *a_bp; |
1701 | } */ *ap = v; |
1702 | struct vnode *vp = ap->a_vp; |
1703 | struct buf *bp = ap->a_bp; |
1704 | struct denode *dep = VTODE(bp->b_vp); |
1705 | int error = 0; |
1706 | |
1707 | if (vp->v_type == VBLK || vp->v_type == VCHR) |
1708 | panic("msdosfs_strategy: spec" ); |
1709 | /* |
1710 | * If we don't already know the filesystem relative block number |
1711 | * then get it using pcbmap(). If pcbmap() returns the block |
1712 | * number as -1 then we've got a hole in the file. DOS filesystems |
1713 | * don't allow files with holes, so we shouldn't ever see this. |
1714 | */ |
1715 | if (bp->b_blkno == bp->b_lblkno) { |
1716 | error = pcbmap(dep, de_bn2cn(dep->de_pmp, bp->b_lblkno), |
1717 | &bp->b_blkno, 0, 0); |
1718 | if (error) |
1719 | bp->b_blkno = -1; |
1720 | if (bp->b_blkno == -1) |
1721 | clrbuf(bp); |
1722 | else |
1723 | bp->b_blkno = de_bn2kb(dep->de_pmp, bp->b_blkno); |
1724 | } |
1725 | if (bp->b_blkno == -1) { |
1726 | biodone(bp); |
1727 | return (error); |
1728 | } |
1729 | |
1730 | /* |
1731 | * Read/write the block from/to the disk that contains the desired |
1732 | * file block. |
1733 | */ |
1734 | |
1735 | vp = dep->de_devvp; |
1736 | return (VOP_STRATEGY(vp, bp)); |
1737 | } |
1738 | |
1739 | int |
1740 | msdosfs_print(void *v) |
1741 | { |
1742 | struct vop_print_args /* { |
1743 | struct vnode *vp; |
1744 | } */ *ap = v; |
1745 | struct denode *dep = VTODE(ap->a_vp); |
1746 | |
1747 | printf( |
1748 | "tag VT_MSDOSFS, startcluster %ld, dircluster %ld, diroffset %ld " , |
1749 | dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); |
1750 | printf(" dev %llu, %llu " , (unsigned long long)major(dep->de_dev), |
1751 | (unsigned long long)minor(dep->de_dev)); |
1752 | printf("\n" ); |
1753 | return (0); |
1754 | } |
1755 | |
1756 | int |
1757 | msdosfs_advlock(void *v) |
1758 | { |
1759 | struct vop_advlock_args /* { |
1760 | struct vnode *a_vp; |
1761 | void *a_id; |
1762 | int a_op; |
1763 | struct flock *a_fl; |
1764 | int a_flags; |
1765 | } */ *ap = v; |
1766 | struct denode *dep = VTODE(ap->a_vp); |
1767 | |
1768 | return lf_advlock(ap, &dep->de_lockf, dep->de_FileSize); |
1769 | } |
1770 | |
1771 | int |
1772 | msdosfs_pathconf(void *v) |
1773 | { |
1774 | struct vop_pathconf_args /* { |
1775 | struct vnode *a_vp; |
1776 | int a_name; |
1777 | register_t *a_retval; |
1778 | } */ *ap = v; |
1779 | |
1780 | switch (ap->a_name) { |
1781 | case _PC_LINK_MAX: |
1782 | *ap->a_retval = 1; |
1783 | return (0); |
1784 | case _PC_NAME_MAX: |
1785 | *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax; |
1786 | return (0); |
1787 | case _PC_PATH_MAX: |
1788 | *ap->a_retval = PATH_MAX; |
1789 | return (0); |
1790 | case _PC_CHOWN_RESTRICTED: |
1791 | *ap->a_retval = 1; |
1792 | return (0); |
1793 | case _PC_NO_TRUNC: |
1794 | *ap->a_retval = 1; |
1795 | return (0); |
1796 | case _PC_SYNC_IO: |
1797 | *ap->a_retval = 1; |
1798 | return (0); |
1799 | case _PC_FILESIZEBITS: |
1800 | *ap->a_retval = 32; |
1801 | return (0); |
1802 | default: |
1803 | return (EINVAL); |
1804 | } |
1805 | /* NOTREACHED */ |
1806 | } |
1807 | |
1808 | int |
1809 | msdosfs_fsync(void *v) |
1810 | { |
1811 | struct vop_fsync_args /* { |
1812 | struct vnode *a_vp; |
1813 | kauth_cred_t a_cred; |
1814 | int a_flags; |
1815 | off_t offlo; |
1816 | off_t offhi; |
1817 | } */ *ap = v; |
1818 | struct vnode *vp = ap->a_vp; |
1819 | int wait; |
1820 | int error; |
1821 | |
1822 | fstrans_start(vp->v_mount, FSTRANS_LAZY); |
1823 | wait = (ap->a_flags & FSYNC_WAIT) != 0; |
1824 | error = vflushbuf(vp, ap->a_flags); |
1825 | if (error == 0 && (ap->a_flags & FSYNC_DATAONLY) == 0) |
1826 | error = msdosfs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); |
1827 | |
1828 | if (error == 0 && ap->a_flags & FSYNC_CACHE) { |
1829 | struct denode *dep = VTODE(vp); |
1830 | struct vnode *devvp = dep->de_devvp; |
1831 | |
1832 | int l = 0; |
1833 | error = VOP_IOCTL(devvp, DIOCCACHESYNC, &l, FWRITE, |
1834 | curlwp->l_cred); |
1835 | } |
1836 | fstrans_done(vp->v_mount); |
1837 | |
1838 | return (error); |
1839 | } |
1840 | |
1841 | void |
1842 | msdosfs_detimes(struct denode *dep, const struct timespec *acc, |
1843 | const struct timespec *mod, const struct timespec *cre, int gmtoff) |
1844 | { |
1845 | struct timespec *ts = NULL, tsb; |
1846 | |
1847 | KASSERT(dep->de_flag & (DE_UPDATE | DE_CREATE | DE_ACCESS)); |
1848 | /* XXX just call getnanotime early and use result if needed? */ |
1849 | dep->de_flag |= DE_MODIFIED; |
1850 | if (dep->de_flag & DE_UPDATE) { |
1851 | if (mod == NULL) { |
1852 | getnanotime(&tsb); |
1853 | mod = ts = &tsb; |
1854 | } |
1855 | unix2dostime(mod, gmtoff, &dep->de_MDate, &dep->de_MTime, NULL); |
1856 | dep->de_Attributes |= ATTR_ARCHIVE; |
1857 | } |
1858 | if ((dep->de_pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0) { |
1859 | if (dep->de_flag & DE_ACCESS) { |
1860 | if (acc == NULL) |
1861 | acc = ts == NULL ? |
1862 | (getnanotime(&tsb), ts = &tsb) : ts; |
1863 | unix2dostime(acc, gmtoff, &dep->de_ADate, NULL, NULL); |
1864 | } |
1865 | if (dep->de_flag & DE_CREATE) { |
1866 | if (cre == NULL) |
1867 | cre = ts == NULL ? |
1868 | (getnanotime(&tsb), ts = &tsb) : ts; |
1869 | unix2dostime(cre, gmtoff, &dep->de_CDate, |
1870 | &dep->de_CTime, &dep->de_CHun); |
1871 | } |
1872 | } |
1873 | |
1874 | dep->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS); |
1875 | } |
1876 | |
1877 | /* Global vfs data structures for msdosfs */ |
1878 | int (**msdosfs_vnodeop_p)(void *); |
1879 | const struct vnodeopv_entry_desc msdosfs_vnodeop_entries[] = { |
1880 | { &vop_default_desc, vn_default_error }, |
1881 | { &vop_lookup_desc, msdosfs_lookup }, /* lookup */ |
1882 | { &vop_create_desc, msdosfs_create }, /* create */ |
1883 | { &vop_mknod_desc, genfs_eopnotsupp }, /* mknod */ |
1884 | { &vop_open_desc, genfs_nullop }, /* open */ |
1885 | { &vop_close_desc, msdosfs_close }, /* close */ |
1886 | { &vop_access_desc, msdosfs_access }, /* access */ |
1887 | { &vop_getattr_desc, msdosfs_getattr }, /* getattr */ |
1888 | { &vop_setattr_desc, msdosfs_setattr }, /* setattr */ |
1889 | { &vop_read_desc, msdosfs_read }, /* read */ |
1890 | { &vop_write_desc, msdosfs_write }, /* write */ |
1891 | { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ |
1892 | { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ |
1893 | { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ |
1894 | { &vop_ioctl_desc, msdosfs_ioctl }, /* ioctl */ |
1895 | { &vop_poll_desc, msdosfs_poll }, /* poll */ |
1896 | { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ |
1897 | { &vop_revoke_desc, msdosfs_revoke }, /* revoke */ |
1898 | { &vop_mmap_desc, msdosfs_mmap }, /* mmap */ |
1899 | { &vop_fsync_desc, msdosfs_fsync }, /* fsync */ |
1900 | { &vop_seek_desc, msdosfs_seek }, /* seek */ |
1901 | { &vop_remove_desc, msdosfs_remove }, /* remove */ |
1902 | { &vop_link_desc, genfs_eopnotsupp }, /* link */ |
1903 | { &vop_rename_desc, msdosfs_rename }, /* rename */ |
1904 | { &vop_mkdir_desc, msdosfs_mkdir }, /* mkdir */ |
1905 | { &vop_rmdir_desc, msdosfs_rmdir }, /* rmdir */ |
1906 | { &vop_symlink_desc, genfs_eopnotsupp }, /* symlink */ |
1907 | { &vop_readdir_desc, msdosfs_readdir }, /* readdir */ |
1908 | { &vop_readlink_desc, genfs_einval }, /* readlink */ |
1909 | { &vop_abortop_desc, msdosfs_abortop }, /* abortop */ |
1910 | { &vop_inactive_desc, msdosfs_inactive }, /* inactive */ |
1911 | { &vop_reclaim_desc, msdosfs_reclaim }, /* reclaim */ |
1912 | { &vop_lock_desc, genfs_lock }, /* lock */ |
1913 | { &vop_unlock_desc, genfs_unlock }, /* unlock */ |
1914 | { &vop_bmap_desc, msdosfs_bmap }, /* bmap */ |
1915 | { &vop_strategy_desc, msdosfs_strategy }, /* strategy */ |
1916 | { &vop_print_desc, msdosfs_print }, /* print */ |
1917 | { &vop_islocked_desc, genfs_islocked }, /* islocked */ |
1918 | { &vop_pathconf_desc, msdosfs_pathconf }, /* pathconf */ |
1919 | { &vop_advlock_desc, msdosfs_advlock }, /* advlock */ |
1920 | { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ |
1921 | { &vop_getpages_desc, genfs_getpages }, /* getpages */ |
1922 | { &vop_putpages_desc, genfs_putpages }, /* putpages */ |
1923 | { NULL, NULL } |
1924 | }; |
1925 | const struct vnodeopv_desc msdosfs_vnodeop_opv_desc = |
1926 | { &msdosfs_vnodeop_p, msdosfs_vnodeop_entries }; |
1927 | |