1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25 /*
26 * Copyright (c) 2017 by Delphix. All rights reserved.
27 */
28
29 #include <sys/param.h>
30 #include <sys/t_lock.h>
31 #include <sys/errno.h>
32 #include <sys/sysmacros.h>
33 #include <sys/buf.h>
34 #include <sys/systm.h>
35 #include <sys/vfs.h>
36 #include <sys/vnode.h>
37 #include <sys/kmem.h>
38 #include <sys/proc.h>
39 #include <sys/cred.h>
40 #include <sys/cmn_err.h>
41 #include <sys/debug.h>
42 #include <vm/pvn.h>
43 #include <sys/fs/pc_label.h>
44 #include <sys/fs/pc_fs.h>
45 #include <sys/fs/pc_dir.h>
46 #include <sys/fs/pc_node.h>
47 #include <sys/dirent.h>
48 #include <sys/fdio.h>
49 #include <sys/file.h>
50 #include <sys/conf.h>
51
52 struct pchead pcfhead[NPCHASH];
53 struct pchead pcdhead[NPCHASH];
54
55 extern krwlock_t pcnodes_lock;
56
57 static int pc_getentryblock(struct pcnode *, struct buf **);
58 static int syncpcp(struct pcnode *, int);
59
60 /*
61 * fake entry for root directory, since this does not have a parent
62 * pointing to it.
63 */
64 struct pcdir pcfs_rootdirentry = {
65 "",
66 "",
67 PCA_DIR
68 };
69
70 void
pc_init(void)71 pc_init(void)
72 {
73 struct pchead *hdp, *hfp;
74 int i;
75 for (i = 0; i < NPCHASH; i++) {
76 hdp = &pcdhead[i];
77 hfp = &pcfhead[i];
78 hdp->pch_forw = (struct pcnode *)hdp;
79 hdp->pch_back = (struct pcnode *)hdp;
80 hfp->pch_forw = (struct pcnode *)hfp;
81 hfp->pch_back = (struct pcnode *)hfp;
82 }
83 }
84
85 struct pcnode *
pc_getnode(struct pcfs * fsp,daddr_t blkno,int offset,struct pcdir * ep)86 pc_getnode(
87 struct pcfs *fsp, /* filsystem for node */
88 daddr_t blkno, /* phys block no of dir entry */
89 int offset, /* offset of dir entry in block */
90 struct pcdir *ep) /* node dir entry */
91 {
92 struct pcnode *pcp;
93 struct pchead *hp;
94 struct vnode *vp;
95 pc_cluster32_t scluster;
96
97 ASSERT(fsp->pcfs_flags & PCFS_LOCKED);
98 if (ep == (struct pcdir *)0) {
99 ep = &pcfs_rootdirentry;
100 scluster = 0;
101 } else {
102 scluster = pc_getstartcluster(fsp, ep);
103 }
104 /*
105 * First look for active nodes.
106 * File nodes are identified by the location (blkno, offset) of
107 * its directory entry.
108 * Directory nodes are identified by the starting cluster number
109 * for the entries.
110 */
111 if (ep->pcd_attr & PCA_DIR) {
112 hp = &pcdhead[PCDHASH(fsp, scluster)];
113 rw_enter(&pcnodes_lock, RW_READER);
114 for (pcp = hp->pch_forw;
115 pcp != (struct pcnode *)hp; pcp = pcp->pc_forw) {
116 if ((fsp == VFSTOPCFS(PCTOV(pcp)->v_vfsp)) &&
117 (scluster == pcp->pc_scluster)) {
118 VN_HOLD(PCTOV(pcp));
119 rw_exit(&pcnodes_lock);
120 return (pcp);
121 }
122 }
123 rw_exit(&pcnodes_lock);
124 } else {
125 hp = &pcfhead[PCFHASH(fsp, blkno, offset)];
126 rw_enter(&pcnodes_lock, RW_READER);
127 for (pcp = hp->pch_forw;
128 pcp != (struct pcnode *)hp; pcp = pcp->pc_forw) {
129 if ((fsp == VFSTOPCFS(PCTOV(pcp)->v_vfsp)) &&
130 ((pcp->pc_flags & PC_INVAL) == 0) &&
131 (blkno == pcp->pc_eblkno) &&
132 (offset == pcp->pc_eoffset)) {
133 VN_HOLD(PCTOV(pcp));
134 rw_exit(&pcnodes_lock);
135 return (pcp);
136 }
137 }
138 rw_exit(&pcnodes_lock);
139 }
140 /*
141 * Cannot find node in active list. Allocate memory for a new node
142 * initialize it, and put it on the active list.
143 */
144 pcp = kmem_zalloc(sizeof (struct pcnode), KM_SLEEP);
145 vp = vn_alloc(KM_SLEEP);
146 pcp->pc_vn = vp;
147 pcp->pc_entry = *ep;
148 pcp->pc_eblkno = blkno;
149 pcp->pc_eoffset = offset;
150 pcp->pc_scluster = scluster;
151 pcp->pc_lcluster = scluster;
152 pcp->pc_lindex = 0;
153 pcp->pc_flags = 0;
154 if (ep->pcd_attr & PCA_DIR) {
155 vn_setops(vp, pcfs_dvnodeops);
156 vp->v_type = VDIR;
157 if (scluster == 0) {
158 vp->v_flag = VROOT;
159 blkno = offset = 0;
160 if (IS_FAT32(fsp)) {
161 pc_cluster32_t ncl = 0;
162
163 scluster = fsp->pcfs_rdirstart;
164 if (pc_fileclsize(fsp, scluster, &ncl)) {
165 PC_DPRINTF1(2, "cluster chain "
166 "corruption, scluster=%d\n",
167 scluster);
168 pcp->pc_flags |= PC_INVAL;
169 }
170 pcp->pc_size = fsp->pcfs_clsize * ncl;
171 } else {
172 pcp->pc_size =
173 fsp->pcfs_rdirsec * fsp->pcfs_secsize;
174 }
175 } else {
176 pc_cluster32_t ncl = 0;
177
178 if (pc_fileclsize(fsp, scluster, &ncl)) {
179 PC_DPRINTF1(2, "cluster chain corruption, "
180 "scluster=%d\n", scluster);
181 pcp->pc_flags |= PC_INVAL;
182 }
183 pcp->pc_size = fsp->pcfs_clsize * ncl;
184 }
185 } else {
186 vn_setops(vp, pcfs_fvnodeops);
187 vp->v_type = VREG;
188 vp->v_flag = VNOSWAP;
189 fsp->pcfs_frefs++;
190 pcp->pc_size = ltohi(ep->pcd_size);
191 }
192 fsp->pcfs_nrefs++;
193 VFS_HOLD(PCFSTOVFS(fsp));
194 vp->v_data = (caddr_t)pcp;
195 vp->v_vfsp = PCFSTOVFS(fsp);
196 vn_exists(vp);
197 rw_enter(&pcnodes_lock, RW_WRITER);
198 insque(pcp, hp);
199 rw_exit(&pcnodes_lock);
200 return (pcp);
201 }
202
203 int
syncpcp(struct pcnode * pcp,int flags)204 syncpcp(struct pcnode *pcp, int flags)
205 {
206 int err;
207 if (!vn_has_cached_data(PCTOV(pcp)))
208 err = 0;
209 else
210 err = VOP_PUTPAGE(PCTOV(pcp), 0, 0, flags,
211 kcred, NULL);
212
213 return (err);
214 }
215
216 void
pc_rele(struct pcnode * pcp)217 pc_rele(struct pcnode *pcp)
218 {
219 struct pcfs *fsp;
220 struct vnode *vp;
221 int err;
222
223 vp = PCTOV(pcp);
224 PC_DPRINTF1(8, "pc_rele vp=0x%p\n", (void *)vp);
225
226 fsp = VFSTOPCFS(vp->v_vfsp);
227 ASSERT(fsp->pcfs_flags & PCFS_LOCKED);
228
229 rw_enter(&pcnodes_lock, RW_WRITER);
230 pcp->pc_flags |= PC_RELEHOLD;
231
232 retry:
233 if (vp->v_type != VDIR && (pcp->pc_flags & PC_INVAL) == 0) {
234 /*
235 * If the file was removed while active it may be safely
236 * truncated now.
237 */
238
239 if (pcp->pc_entry.pcd_filename[0] == PCD_ERASED) {
240 (void) pc_truncate(pcp, 0);
241 } else if (pcp->pc_flags & PC_CHG) {
242 (void) pc_nodeupdate(pcp);
243 }
244 err = syncpcp(pcp, B_INVAL);
245 if (err) {
246 (void) syncpcp(pcp, B_INVAL | B_FORCE);
247 }
248 }
249 if (vn_has_cached_data(vp)) {
250 /*
251 * pvn_vplist_dirty will abort all old pages
252 */
253 (void) pvn_vplist_dirty(vp, (u_offset_t)0,
254 pcfs_putapage, B_INVAL, (struct cred *)NULL);
255 }
256
257 (void) pc_syncfat(fsp);
258 mutex_enter(&vp->v_lock);
259 if (vn_has_cached_data(vp)) {
260 mutex_exit(&vp->v_lock);
261 goto retry;
262 }
263 ASSERT(!vn_has_cached_data(vp));
264
265 VN_RELE_LOCKED(vp);
266 if (vp->v_count > 0) { /* Is this check still needed? */
267 PC_DPRINTF1(3, "pc_rele: pcp=0x%p HELD AGAIN!\n", (void *)pcp);
268 mutex_exit(&vp->v_lock);
269 pcp->pc_flags &= ~PC_RELEHOLD;
270 rw_exit(&pcnodes_lock);
271 return;
272 }
273
274 remque(pcp);
275 rw_exit(&pcnodes_lock);
276 /*
277 * XXX - old code had a check for !(pcp->pc_flags & PC_INVAL)
278 * here. Seems superfluous/incorrect, but then earlier on PC_INVAL
279 * was never set anywhere in PCFS. Now it is, and we _have_ to drop
280 * the file reference here. Else, we'd screw up umount/modunload.
281 */
282 if ((vp->v_type == VREG)) {
283 fsp->pcfs_frefs--;
284 }
285 fsp->pcfs_nrefs--;
286 VFS_RELE(vp->v_vfsp);
287
288 if (fsp->pcfs_nrefs < 0) {
289 panic("pc_rele: nrefs count");
290 }
291 if (fsp->pcfs_frefs < 0) {
292 panic("pc_rele: frefs count");
293 }
294
295 mutex_exit(&vp->v_lock);
296 vn_invalid(vp);
297 vn_free(vp);
298 kmem_free(pcp, sizeof (struct pcnode));
299 }
300
301 /*
302 * Mark a pcnode as modified with the current time.
303 */
304 /* ARGSUSED */
305 void
pc_mark_mod(struct pcfs * fsp,struct pcnode * pcp)306 pc_mark_mod(struct pcfs *fsp, struct pcnode *pcp)
307 {
308 timestruc_t now;
309
310 if (PCTOV(pcp)->v_type == VDIR)
311 return;
312
313 ASSERT(PCTOV(pcp)->v_type == VREG);
314
315 gethrestime(&now);
316 if (pc_tvtopct(&now, &pcp->pc_entry.pcd_mtime))
317 PC_DPRINTF1(2, "pc_mark_mod failed timestamp "
318 "conversion, curtime = %lld\n",
319 (long long)now.tv_sec);
320
321 pcp->pc_flags |= PC_CHG;
322 }
323
324 /*
325 * Mark a pcnode as accessed with the current time.
326 */
327 void
pc_mark_acc(struct pcfs * fsp,struct pcnode * pcp)328 pc_mark_acc(struct pcfs *fsp, struct pcnode *pcp)
329 {
330 struct pctime pt = { 0, 0 };
331 timestruc_t now;
332
333 if (fsp->pcfs_flags & PCFS_NOATIME || PCTOV(pcp)->v_type == VDIR)
334 return;
335
336 ASSERT(PCTOV(pcp)->v_type == VREG);
337
338 gethrestime(&now);
339 if (pc_tvtopct(&now, &pt)) {
340 PC_DPRINTF1(2, "pc_mark_acc failed timestamp "
341 "conversion, curtime = %lld\n",
342 (long long)now.tv_sec);
343 return;
344 }
345
346 /*
347 * We don't really want to write the adate for every access
348 * on flash media; make sure it really changed !
349 */
350 if (pcp->pc_entry.pcd_ladate != pt.pct_date) {
351 pcp->pc_entry.pcd_ladate = pt.pct_date;
352 pcp->pc_flags |= (PC_CHG | PC_ACC);
353 }
354 }
355
356 /*
357 * Truncate a file to a length.
358 * Node must be locked.
359 */
360 int
pc_truncate(struct pcnode * pcp,uint_t length)361 pc_truncate(struct pcnode *pcp, uint_t length)
362 {
363 struct pcfs *fsp;
364 struct vnode *vp;
365 int error = 0;
366
367 PC_DPRINTF3(4, "pc_truncate pcp=0x%p, len=%u, size=%u\n",
368 (void *)pcp, length, pcp->pc_size);
369 vp = PCTOV(pcp);
370 if (pcp->pc_flags & PC_INVAL)
371 return (EIO);
372 fsp = VFSTOPCFS(vp->v_vfsp);
373 /*
374 * directories are always truncated to zero and are not marked
375 */
376 if (vp->v_type == VDIR) {
377 error = pc_bfree(pcp, 0);
378 return (error);
379 }
380 /*
381 * If length is the same as the current size
382 * just mark the pcnode and return.
383 */
384 if (length > pcp->pc_size) {
385 daddr_t bno;
386 uint_t llcn = howmany((offset_t)length, fsp->pcfs_clsize);
387
388 /*
389 * We are extending a file.
390 * Extend it with _one_ call to pc_balloc (no holes)
391 * since we don't need to use the block number(s).
392 */
393 if ((daddr_t)howmany((offset_t)pcp->pc_size, fsp->pcfs_clsize) <
394 (daddr_t)llcn) {
395 error = pc_balloc(pcp, (daddr_t)(llcn - 1), 1, &bno);
396 }
397 if (error) {
398 pc_cluster32_t ncl = 0;
399 PC_DPRINTF1(2, "pc_truncate: error=%d\n", error);
400 /*
401 * probably ran out disk space;
402 * determine current file size
403 */
404 if (pc_fileclsize(fsp, pcp->pc_scluster, &ncl)) {
405 PC_DPRINTF1(2, "cluster chain corruption, "
406 "scluster=%d\n", pcp->pc_scluster);
407 pcp->pc_flags |= PC_INVAL;
408 }
409 pcp->pc_size = fsp->pcfs_clsize * ncl;
410 } else
411 pcp->pc_size = length;
412
413 } else if (length < pcp->pc_size) {
414 /*
415 * We are shrinking a file.
416 * Free blocks after the block that length points to.
417 */
418 if (pc_blkoff(fsp, length) == 0) {
419 /*
420 * Truncation to a block (cluster size) boundary only
421 * requires us to invalidate everything after the new
422 * end of the file.
423 */
424 (void) pvn_vplist_dirty(PCTOV(pcp), (u_offset_t)length,
425 pcfs_putapage, B_INVAL | B_TRUNC, CRED());
426 } else {
427 /*
428 * pvn_vpzero() cannot deal with more than MAXBSIZE
429 * chunks. Since the FAT clustersize can get larger
430 * than that, we'll zero from the new length to the
431 * end of the cluster for clustersizes smaller than
432 * MAXBSIZE - or the end of the MAXBSIZE block in
433 * case we've got a large clustersize.
434 */
435 size_t nbytes =
436 roundup(length, MIN(fsp->pcfs_clsize, MAXBSIZE)) -
437 length;
438
439 pvn_vpzero(PCTOV(pcp), (u_offset_t)length, nbytes);
440 (void) pvn_vplist_dirty(PCTOV(pcp),
441 (u_offset_t)length + nbytes,
442 pcfs_putapage, B_INVAL | B_TRUNC, CRED());
443 }
444 error = pc_bfree(pcp, (pc_cluster32_t)
445 howmany((offset_t)length, fsp->pcfs_clsize));
446 pcp->pc_size = length;
447 }
448
449 /*
450 * This is the only place in PCFS code where pc_mark_mod() is called
451 * without setting PC_MOD. May be a historical artifact ...
452 */
453 pc_mark_mod(fsp, pcp);
454 return (error);
455 }
456
457 /*
458 * Get block for entry.
459 */
460 static int
pc_getentryblock(struct pcnode * pcp,struct buf ** bpp)461 pc_getentryblock(struct pcnode *pcp, struct buf **bpp)
462 {
463 struct pcfs *fsp;
464
465 fsp = VFSTOPCFS(PCTOV(pcp)->v_vfsp);
466 if (pcp->pc_eblkno >= fsp->pcfs_datastart ||
467 (pcp->pc_eblkno - fsp->pcfs_rdirstart) <
468 (fsp->pcfs_rdirsec & ~(fsp->pcfs_spcl - 1))) {
469 *bpp = bread(fsp->pcfs_xdev,
470 pc_dbdaddr(fsp, pcp->pc_eblkno), fsp->pcfs_clsize);
471 } else {
472 *bpp = bread(fsp->pcfs_xdev,
473 pc_dbdaddr(fsp, pcp->pc_eblkno),
474 (int)(fsp->pcfs_datastart - pcp->pc_eblkno) *
475 fsp->pcfs_secsize);
476 }
477 if ((*bpp)->b_flags & B_ERROR) {
478 brelse(*bpp);
479 pc_mark_irrecov(fsp);
480 return (EIO);
481 }
482 return (0);
483 }
484
485 /*
486 * Sync all data associated with a file.
487 * Flush all the blocks in the buffer cache out to disk, sync the FAT and
488 * update the directory entry.
489 */
490 int
pc_nodesync(struct pcnode * pcp)491 pc_nodesync(struct pcnode *pcp)
492 {
493 struct pcfs *fsp;
494 int err;
495 struct vnode *vp;
496
497 vp = PCTOV(pcp);
498 fsp = VFSTOPCFS(vp->v_vfsp);
499 err = 0;
500 if (pcp->pc_flags & PC_MOD) {
501 /*
502 * Flush all data blocks from buffer cache and
503 * update the FAT which points to the data.
504 */
505 if (err = syncpcp(pcp, 0)) { /* %% ?? how to handle error? */
506 if (err == ENOMEM)
507 return (err);
508 else {
509 pc_mark_irrecov(fsp);
510 return (EIO);
511 }
512 }
513 pcp->pc_flags &= ~PC_MOD;
514 }
515 /*
516 * update the directory entry
517 */
518 if (pcp->pc_flags & PC_CHG)
519 (void) pc_nodeupdate(pcp);
520 return (err);
521 }
522
523 /*
524 * Update the node's directory entry.
525 */
526 int
pc_nodeupdate(struct pcnode * pcp)527 pc_nodeupdate(struct pcnode *pcp)
528 {
529 struct buf *bp;
530 int error;
531 struct vnode *vp;
532 struct pcfs *fsp;
533
534 vp = PCTOV(pcp);
535 fsp = VFSTOPCFS(vp->v_vfsp);
536 if (IS_FAT32(fsp) && (vp->v_flag & VROOT)) {
537 /* no node to update */
538 pcp->pc_flags &= ~(PC_CHG | PC_MOD | PC_ACC);
539 return (0);
540 }
541 if (vp->v_flag & VROOT) {
542 panic("pc_nodeupdate");
543 }
544 if (pcp->pc_flags & PC_INVAL)
545 return (0);
546 PC_DPRINTF3(7, "pc_nodeupdate pcp=0x%p, bn=%ld, off=%d\n", (void *)pcp,
547 pcp->pc_eblkno, pcp->pc_eoffset);
548
549 if (error = pc_getentryblock(pcp, &bp)) {
550 return (error);
551 }
552 if (vp->v_type == VREG) {
553 if (pcp->pc_flags & PC_CHG)
554 pcp->pc_entry.pcd_attr |= PCA_ARCH;
555 pcp->pc_entry.pcd_size = htoli(pcp->pc_size);
556 }
557 pc_setstartcluster(fsp, &pcp->pc_entry, pcp->pc_scluster);
558 *((struct pcdir *)(bp->b_un.b_addr + pcp->pc_eoffset)) = pcp->pc_entry;
559 bwrite2(bp);
560 error = geterror(bp);
561 brelse(bp);
562 if (error) {
563 error = EIO;
564 pc_mark_irrecov(VFSTOPCFS(vp->v_vfsp));
565 }
566 pcp->pc_flags &= ~(PC_CHG | PC_MOD | PC_ACC);
567 return (error);
568 }
569
570 /*
571 * Verify that the disk in the drive is the same one that we
572 * got the pcnode from.
573 * MUST be called with node unlocked.
574 */
575 int
pc_verify(struct pcfs * fsp)576 pc_verify(struct pcfs *fsp)
577 {
578 int fdstatus = 0;
579 int error = 0;
580
581 if (!fsp || fsp->pcfs_flags & PCFS_IRRECOV)
582 return (EIO);
583
584 if (!(fsp->pcfs_flags & PCFS_NOCHK) && fsp->pcfs_fatp) {
585 /*
586 * This "has it been removed" check should better be
587 * modified for removeable media that are not floppies.
588 * dkio-managed devices such as USB/firewire external
589 * disks/memory sticks/floppies (gasp) do not understand
590 * this ioctl.
591 */
592 PC_DPRINTF1(4, "pc_verify fsp=0x%p\n", (void *)fsp);
593 error = cdev_ioctl(fsp->pcfs_vfs->vfs_dev,
594 FDGETCHANGE, (intptr_t)&fdstatus, FNATIVE | FKIOCTL,
595 NULL, NULL);
596
597 if (error) {
598 if (error == ENOTTY || error == ENXIO) {
599 /*
600 * See comment above. This is a workaround
601 * for removeable media that don't understand
602 * floppy ioctls.
603 */
604 error = 0;
605 } else {
606 PC_DPRINTF1(1,
607 "pc_verify: FDGETCHANGE ioctl failed: %d\n",
608 error);
609 pc_mark_irrecov(fsp);
610 }
611 } else if (fsp->pcfs_fatjustread) {
612 /*
613 * Ignore the results of the ioctl if we just
614 * read the FAT. There is a good chance that
615 * the disk changed bit will be on, because
616 * we've just mounted and we don't want to
617 * give a false positive that the sky is falling.
618 */
619 fsp->pcfs_fatjustread = 0;
620 } else {
621 /*
622 * Oddly enough we can't check just one flag here. The
623 * x86 floppy driver sets a different flag
624 * (FDGC_DETECTED) than the sparc driver does.
625 * I think this MAY be a bug, and I filed 4165938
626 * to get someone to look at the behavior
627 * a bit more closely. In the meantime, my testing and
628 * code examination seem to indicate it is safe to
629 * check for either bit being set.
630 */
631 if (fdstatus & (FDGC_HISTORY | FDGC_DETECTED)) {
632 PC_DPRINTF0(1, "pc_verify: change detected\n");
633 pc_mark_irrecov(fsp);
634 }
635 }
636 }
637 if (error == 0 && fsp->pcfs_fatp == NULL) {
638 error = pc_getfat(fsp);
639 }
640
641 return (error);
642 }
643
644 /*
645 * The disk has changed, pulling the rug out from beneath us.
646 * Mark the FS as being in an irrecoverable state.
647 * In a short while we'll clean up.
648 */
649 void
pc_mark_irrecov(struct pcfs * fsp)650 pc_mark_irrecov(struct pcfs *fsp)
651 {
652 if (!(fsp->pcfs_flags & PCFS_NOCHK)) {
653 if (pc_lockfs(fsp, 1, 0)) {
654 /*
655 * Locking failed, which currently would
656 * only happen if the FS were already
657 * marked as hosed. If another reason for
658 * failure were to arise in the future, this
659 * routine would have to change.
660 */
661 return;
662 }
663
664 fsp->pcfs_flags |= PCFS_IRRECOV;
665 cmn_err(CE_WARN,
666 "Disk was changed during an update or\n"
667 "an irrecoverable error was encountered.\n"
668 "File damage is possible. To prevent further\n"
669 "damage, this pcfs instance will now be frozen.\n"
670 "Use umount(8) to release the instance.\n");
671 (void) pc_unlockfs(fsp);
672 }
673 }
674
675 /*
676 * The disk has been changed!
677 */
678 void
pc_diskchanged(struct pcfs * fsp)679 pc_diskchanged(struct pcfs *fsp)
680 {
681 struct pcnode *pcp, *npcp = NULL;
682 struct pchead *hp;
683 struct vnode *vp;
684 extern vfs_t EIO_vfs;
685 struct vfs *vfsp;
686
687 /*
688 * Eliminate all pcnodes (dir & file) associated with this fs.
689 * If the node is internal, ie, no references outside of
690 * pcfs itself, then release the associated vnode structure.
691 * Invalidate the in core FAT.
692 * Invalidate cached data blocks and blocks waiting for I/O.
693 */
694 PC_DPRINTF1(1, "pc_diskchanged fsp=0x%p\n", (void *)fsp);
695
696 vfsp = PCFSTOVFS(fsp);
697
698 for (hp = pcdhead; hp < &pcdhead[NPCHASH]; hp++) {
699 for (pcp = hp->pch_forw;
700 pcp != (struct pcnode *)hp; pcp = npcp) {
701 npcp = pcp -> pc_forw;
702 vp = PCTOV(pcp);
703 if ((vp->v_vfsp == vfsp) &&
704 !(pcp->pc_flags & PC_RELEHOLD)) {
705 mutex_enter(&(vp)->v_lock);
706 if (vp->v_count > 0) {
707 mutex_exit(&(vp)->v_lock);
708 continue;
709 }
710 mutex_exit(&(vp)->v_lock);
711 VN_HOLD(vp);
712 remque(pcp);
713 vp->v_data = NULL;
714 vp->v_vfsp = &EIO_vfs;
715 vp->v_type = VBAD;
716 VN_RELE(vp);
717 if (!(pcp->pc_flags & PC_EXTERNAL)) {
718 (void) pvn_vplist_dirty(vp,
719 (u_offset_t)0, pcfs_putapage,
720 B_INVAL | B_TRUNC,
721 (struct cred *)NULL);
722 vn_free(vp);
723 }
724 kmem_free(pcp, sizeof (struct pcnode));
725 fsp->pcfs_nrefs --;
726 VFS_RELE(vfsp);
727 }
728 }
729 }
730 for (hp = pcfhead; fsp->pcfs_frefs && hp < &pcfhead[NPCHASH]; hp++) {
731 for (pcp = hp->pch_forw; fsp->pcfs_frefs &&
732 pcp != (struct pcnode *)hp; pcp = npcp) {
733 npcp = pcp -> pc_forw;
734 vp = PCTOV(pcp);
735 if ((vp->v_vfsp == vfsp) &&
736 !(pcp->pc_flags & PC_RELEHOLD)) {
737 mutex_enter(&(vp)->v_lock);
738 if (vp->v_count > 0) {
739 mutex_exit(&(vp)->v_lock);
740 continue;
741 }
742 mutex_exit(&(vp)->v_lock);
743 VN_HOLD(vp);
744 remque(pcp);
745 vp->v_data = NULL;
746 vp->v_vfsp = &EIO_vfs;
747 vp->v_type = VBAD;
748 VN_RELE(vp);
749 if (!(pcp->pc_flags & PC_EXTERNAL)) {
750 (void) pvn_vplist_dirty(vp,
751 (u_offset_t)0, pcfs_putapage,
752 B_INVAL | B_TRUNC,
753 (struct cred *)NULL);
754 vn_free(vp);
755 }
756 kmem_free(pcp, sizeof (struct pcnode));
757 fsp->pcfs_frefs--;
758 fsp->pcfs_nrefs--;
759 VFS_RELE(vfsp);
760 }
761 }
762 }
763 #ifdef undef
764 if (fsp->pcfs_frefs) {
765 rw_exit(&pcnodes_lock);
766 panic("pc_diskchanged: frefs");
767 }
768 if (fsp->pcfs_nrefs) {
769 rw_exit(&pcnodes_lock);
770 panic("pc_diskchanged: nrefs");
771 }
772 #endif
773 if (!(vfsp->vfs_flag & VFS_UNMOUNTED) &&
774 fsp->pcfs_fatp != (uchar_t *)0) {
775 pc_invalfat(fsp);
776 } else {
777 binval(fsp->pcfs_xdev);
778 }
779 }
780