1 /* $NetBSD: msdosfs_denode.c,v 1.51 2015/03/28 19:24:05 maxv 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_denode.c,v 1.51 2015/03/28 19:24:05 maxv Exp $");
52
53 #include <sys/param.h>
54 #include <sys/systm.h>
55 #include <sys/mount.h>
56 #include <sys/fstrans.h>
57 #include <sys/malloc.h>
58 #include <sys/pool.h>
59 #include <sys/proc.h>
60 #include <sys/buf.h>
61 #include <sys/vnode.h>
62 #include <sys/kernel.h> /* defines "time" */
63 #include <sys/dirent.h>
64 #include <sys/namei.h>
65 #include <sys/kauth.h>
66
67 #include <uvm/uvm_extern.h>
68
69 #include <fs/msdosfs/bpb.h>
70 #include <fs/msdosfs/msdosfsmount.h>
71 #include <fs/msdosfs/direntry.h>
72 #include <fs/msdosfs/denode.h>
73 #include <fs/msdosfs/fat.h>
74
75 struct pool msdosfs_denode_pool;
76
77 extern int prtactive;
78
79 struct fh_key {
80 struct msdosfsmount *fhk_mount;
81 uint32_t fhk_dircluster;
82 uint32_t fhk_diroffset;
83 };
84 struct fh_node {
85 struct rb_node fh_rbnode;
86 struct fh_key fh_key;
87 #define fh_mount fh_key.fhk_mount
88 #define fh_dircluster fh_key.fhk_dircluster
89 #define fh_diroffset fh_key.fhk_diroffset
90 uint32_t fh_gen;
91 };
92
93 static int
fh_compare_node_fh(void * ctx,const void * b,const void * key)94 fh_compare_node_fh(void *ctx, const void *b, const void *key)
95 {
96 const struct fh_node * const pnp = b;
97 const struct fh_key * const fhp = key;
98
99 /* msdosfs_fh_destroy() below depends on first sorting on fh_mount. */
100 if (pnp->fh_mount != fhp->fhk_mount)
101 return (intptr_t)pnp->fh_mount - (intptr_t)fhp->fhk_mount;
102 if (pnp->fh_dircluster != fhp->fhk_dircluster)
103 return pnp->fh_dircluster - fhp->fhk_dircluster;
104 return pnp->fh_diroffset - fhp->fhk_diroffset;
105 }
106
107 static int
fh_compare_nodes(void * ctx,const void * parent,const void * node)108 fh_compare_nodes(void *ctx, const void *parent, const void *node)
109 {
110 const struct fh_node * const np = node;
111
112 return fh_compare_node_fh(ctx, parent, &np->fh_key);
113 }
114
115 static uint32_t fh_generation;
116 static kmutex_t fh_lock;
117 static struct pool fh_pool;
118 static rb_tree_t fh_rbtree;
119 static const rb_tree_ops_t fh_rbtree_ops = {
120 .rbto_compare_nodes = fh_compare_nodes,
121 .rbto_compare_key = fh_compare_node_fh,
122 .rbto_node_offset = offsetof(struct fh_node, fh_rbnode),
123 .rbto_context = NULL
124 };
125
126 static const struct genfs_ops msdosfs_genfsops = {
127 .gop_size = genfs_size,
128 .gop_alloc = msdosfs_gop_alloc,
129 .gop_write = genfs_gop_write,
130 .gop_markupdate = msdosfs_gop_markupdate,
131 };
132
133 MALLOC_DECLARE(M_MSDOSFSFAT);
134
135 void
msdosfs_init(void)136 msdosfs_init(void)
137 {
138
139 malloc_type_attach(M_MSDOSFSMNT);
140 malloc_type_attach(M_MSDOSFSFAT);
141 malloc_type_attach(M_MSDOSFSTMP);
142 pool_init(&msdosfs_denode_pool, sizeof(struct denode), 0, 0, 0,
143 "msdosnopl", &pool_allocator_nointr, IPL_NONE);
144 pool_init(&fh_pool, sizeof(struct fh_node), 0, 0, 0,
145 "msdosfhpl", &pool_allocator_nointr, IPL_NONE);
146 rb_tree_init(&fh_rbtree, &fh_rbtree_ops);
147 mutex_init(&fh_lock, MUTEX_DEFAULT, IPL_NONE);
148 }
149
150 /*
151 * Reinitialize.
152 */
153
154 void
msdosfs_reinit(void)155 msdosfs_reinit(void)
156 {
157
158 }
159
160 void
msdosfs_done(void)161 msdosfs_done(void)
162 {
163 pool_destroy(&msdosfs_denode_pool);
164 pool_destroy(&fh_pool);
165 mutex_destroy(&fh_lock);
166 malloc_type_detach(M_MSDOSFSTMP);
167 malloc_type_detach(M_MSDOSFSFAT);
168 malloc_type_detach(M_MSDOSFSMNT);
169 }
170
171 /*
172 * If deget() succeeds it returns with the gotten denode unlocked.
173 *
174 * pmp - address of msdosfsmount structure of the filesystem containing
175 * the denode of interest. The pm_dev field and the address of
176 * the msdosfsmount structure are used.
177 * dirclust - which cluster bp contains, if dirclust is 0 (root directory)
178 * diroffset is relative to the beginning of the root directory,
179 * otherwise it is cluster relative.
180 * diroffset - offset past begin of cluster of denode we want
181 * vpp - returns the address of the gotten vnode.
182 */
183 int
deget(struct msdosfsmount * pmp,u_long dirclust,u_long diroffset,struct vnode ** vpp)184 deget(struct msdosfsmount *pmp, u_long dirclust, u_long diroffset,
185 struct vnode **vpp)
186 /* pmp: so we know the maj/min number */
187 /* dirclust: cluster this dir entry came from */
188 /* diroffset: index of entry within the cluster */
189 /* vpp: returns the addr of the gotten vnode */
190 {
191 int error;
192 struct denode_key key;
193
194 /*
195 * On FAT32 filesystems, root is a (more or less) normal
196 * directory
197 */
198 if (FAT32(pmp) && dirclust == MSDOSFSROOT)
199 dirclust = pmp->pm_rootdirblk;
200
201 memset(&key, 0, sizeof(key));
202 key.dk_dirclust = dirclust;
203 key.dk_diroffset = diroffset;
204 /* key.dk_dirgen = NULL; */
205
206 error = vcache_get(pmp->pm_mountp, &key, sizeof(key), vpp);
207 return error;
208 }
209
210 int
msdosfs_loadvnode(struct mount * mp,struct vnode * vp,const void * key,size_t key_len,const void ** new_key)211 msdosfs_loadvnode(struct mount *mp, struct vnode *vp,
212 const void *key, size_t key_len, const void **new_key)
213 {
214 bool is_root;
215 int error;
216 extern int (**msdosfs_vnodeop_p)(void *);
217 struct msdosfsmount *pmp;
218 struct direntry *direntptr;
219 struct denode *ldep;
220 struct buf *bp;
221 struct denode_key dkey;
222
223 KASSERT(key_len == sizeof(dkey));
224 memcpy(&dkey, key, key_len);
225 KASSERT(dkey.dk_dirgen == NULL);
226
227 pmp = VFSTOMSDOSFS(mp);
228 is_root = ((dkey.dk_dirclust == MSDOSFSROOT ||
229 (FAT32(pmp) && dkey.dk_dirclust == pmp->pm_rootdirblk)) &&
230 dkey.dk_diroffset == MSDOSFSROOT_OFS);
231
232 #ifdef MSDOSFS_DEBUG
233 printf("loadvnode(pmp %p, dirclust %lu, diroffset %lx, vp %p)\n",
234 pmp, dkey.dk_dirclust, dkey.dk_diroffset, vp);
235 #endif
236
237 ldep = pool_get(&msdosfs_denode_pool, PR_WAITOK);
238 memset(ldep, 0, sizeof *ldep);
239 /* ldep->de_flag = 0; */
240 /* ldep->de_devvp = 0; */
241 /* ldep->de_lockf = 0; */
242 ldep->de_dev = pmp->pm_dev;
243 ldep->de_dirclust = dkey.dk_dirclust;
244 ldep->de_diroffset = dkey.dk_diroffset;
245 ldep->de_pmp = pmp;
246 ldep->de_devvp = pmp->pm_devvp;
247 ldep->de_refcnt = 1;
248 fc_purge(ldep, 0); /* init the FAT cache for this denode */
249
250 /*
251 * Copy the directory entry into the denode area of the vnode.
252 */
253 if (is_root) {
254 /*
255 * Directory entry for the root directory. There isn't one,
256 * so we manufacture one. We should probably rummage
257 * through the root directory and find a label entry (if it
258 * exists), and then use the time and date from that entry
259 * as the time and date for the root denode.
260 */
261 ldep->de_Attributes = ATTR_DIRECTORY;
262 if (FAT32(pmp))
263 ldep->de_StartCluster = pmp->pm_rootdirblk;
264 /* de_FileSize will be filled in further down */
265 else {
266 ldep->de_StartCluster = MSDOSFSROOT;
267 ldep->de_FileSize = pmp->pm_rootdirsize *
268 pmp->pm_BytesPerSec;
269 }
270 /*
271 * fill in time and date so that dos2unixtime() doesn't
272 * spit up when called from msdosfs_getattr() with root
273 * denode
274 */
275 ldep->de_CHun = 0;
276 ldep->de_CTime = 0x0000; /* 00:00:00 */
277 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
278 | (1 << DD_DAY_SHIFT);
279 /* Jan 1, 1980 */
280 ldep->de_ADate = ldep->de_CDate;
281 ldep->de_MTime = ldep->de_CTime;
282 ldep->de_MDate = ldep->de_CDate;
283 /* leave the other fields as garbage */
284 } else {
285 error = readep(pmp, ldep->de_dirclust, ldep->de_diroffset,
286 &bp, &direntptr);
287 if (error) {
288 pool_put(&msdosfs_denode_pool, ldep);
289 return error;
290 }
291 DE_INTERNALIZE(ldep, direntptr);
292 brelse(bp, 0);
293 }
294
295 /*
296 * Fill in a few fields of the vnode and finish filling in the
297 * denode.
298 */
299 if (ldep->de_Attributes & ATTR_DIRECTORY) {
300 /*
301 * Since DOS directory entries that describe directories
302 * have 0 in the filesize field, we take this opportunity
303 * to find out the length of the directory and plug it into
304 * the denode structure.
305 */
306 u_long size;
307
308 vp->v_type = VDIR;
309 if (ldep->de_StartCluster != MSDOSFSROOT) {
310 error = pcbmap(ldep, CLUST_END, 0, &size, 0);
311 if (error == E2BIG) {
312 ldep->de_FileSize = de_cn2off(pmp, size);
313 error = 0;
314 } else
315 printf("loadvnode(): pcbmap returned %d\n",
316 error);
317 }
318 } else
319 vp->v_type = VREG;
320 vref(ldep->de_devvp);
321 if (is_root)
322 vp->v_vflag |= VV_ROOT;
323 vp->v_tag = VT_MSDOSFS;
324 vp->v_op = msdosfs_vnodeop_p;
325 vp->v_data = ldep;
326 ldep->de_vnode = vp;
327 genfs_node_init(vp, &msdosfs_genfsops);
328 uvm_vnp_setsize(vp, ldep->de_FileSize);
329 *new_key = &ldep->de_key;
330
331 return 0;
332 }
333
334 int
deupdat(struct denode * dep,int waitfor)335 deupdat(struct denode *dep, int waitfor)
336 {
337
338 return (msdosfs_update(DETOV(dep), NULL, NULL,
339 waitfor ? UPDATE_WAIT : 0));
340 }
341
342 /*
343 * Truncate the file described by dep to the length specified by length.
344 */
345 int
detrunc(struct denode * dep,u_long length,int flags,kauth_cred_t cred)346 detrunc(struct denode *dep, u_long length, int flags, kauth_cred_t cred)
347 {
348 int error;
349 int allerror;
350 u_long eofentry;
351 u_long chaintofree = 0;
352 daddr_t bn, lastblock;
353 int boff;
354 int isadir = dep->de_Attributes & ATTR_DIRECTORY;
355 struct buf *bp;
356 struct msdosfsmount *pmp = dep->de_pmp;
357
358 #ifdef MSDOSFS_DEBUG
359 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
360 #endif
361
362 /*
363 * Disallow attempts to truncate the root directory since it is of
364 * fixed size. That's just the way dos filesystems are. We use
365 * the VROOT bit in the vnode because checking for the directory
366 * bit and a startcluster of 0 in the denode is not adequate to
367 * recognize the root directory at this point in a file or
368 * directory's life.
369 */
370 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) {
371 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
372 dep->de_dirclust, dep->de_diroffset);
373 return (EINVAL);
374 }
375
376 uvm_vnp_setsize(DETOV(dep), length);
377
378 if (dep->de_FileSize < length)
379 return (deextend(dep, length, cred));
380 lastblock = de_clcount(pmp, length) - 1;
381
382 /*
383 * If the desired length is 0 then remember the starting cluster of
384 * the file and set the StartCluster field in the directory entry
385 * to 0. If the desired length is not zero, then get the number of
386 * the last cluster in the shortened file. Then get the number of
387 * the first cluster in the part of the file that is to be freed.
388 * Then set the next cluster pointer in the last cluster of the
389 * file to CLUST_EOFE.
390 */
391 if (length == 0) {
392 chaintofree = dep->de_StartCluster;
393 dep->de_StartCluster = 0;
394 eofentry = ~0;
395 } else {
396 error = pcbmap(dep, lastblock, 0, &eofentry, 0);
397 if (error) {
398 #ifdef MSDOSFS_DEBUG
399 printf("detrunc(): pcbmap fails %d\n", error);
400 #endif
401 return (error);
402 }
403 }
404
405 /*
406 * If the new length is not a multiple of the cluster size then we
407 * must zero the tail end of the new last cluster in case it
408 * becomes part of the file again because of a seek.
409 */
410 if ((boff = length & pmp->pm_crbomask) != 0) {
411 if (isadir) {
412 bn = cntobn(pmp, eofentry);
413 error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn),
414 pmp->pm_bpcluster, B_MODIFY, &bp);
415 if (error) {
416 #ifdef MSDOSFS_DEBUG
417 printf("detrunc(): bread fails %d\n", error);
418 #endif
419 return (error);
420 }
421 memset((char *)bp->b_data + boff, 0,
422 pmp->pm_bpcluster - boff);
423 if (flags & IO_SYNC)
424 bwrite(bp);
425 else
426 bdwrite(bp);
427 } else {
428 ubc_zerorange(&DETOV(dep)->v_uobj, length,
429 pmp->pm_bpcluster - boff,
430 UBC_UNMAP_FLAG(DETOV(dep)));
431 }
432 }
433
434 /*
435 * Write out the updated directory entry. Even if the update fails
436 * we free the trailing clusters.
437 */
438 dep->de_FileSize = length;
439 if (!isadir)
440 dep->de_flag |= DE_UPDATE|DE_MODIFIED;
441 vtruncbuf(DETOV(dep), lastblock + 1, 0, 0);
442 allerror = deupdat(dep, 1);
443 #ifdef MSDOSFS_DEBUG
444 printf("detrunc(): allerror %d, eofentry %lu\n",
445 allerror, eofentry);
446 #endif
447
448 fc_purge(dep, lastblock + 1);
449
450 /*
451 * If we need to break the cluster chain for the file then do it
452 * now.
453 */
454 if (eofentry != ~0) {
455 error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
456 &chaintofree, CLUST_EOFE);
457 if (error) {
458 #ifdef MSDOSFS_DEBUG
459 printf("detrunc(): fatentry errors %d\n", error);
460 #endif
461 return (error);
462 }
463 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
464 eofentry);
465 }
466
467 /*
468 * Now free the clusters removed from the file because of the
469 * truncation.
470 */
471 if (chaintofree != 0 && !MSDOSFSEOF(chaintofree, pmp->pm_fatmask))
472 freeclusterchain(pmp, chaintofree);
473
474 return (allerror);
475 }
476
477 /*
478 * Extend the file described by dep to length specified by length.
479 */
480 int
deextend(struct denode * dep,u_long length,kauth_cred_t cred)481 deextend(struct denode *dep, u_long length, kauth_cred_t cred)
482 {
483 struct msdosfsmount *pmp = dep->de_pmp;
484 u_long count, osize;
485 int error;
486
487 /*
488 * The root of a DOS filesystem cannot be extended.
489 */
490 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp))
491 return (EINVAL);
492
493 /*
494 * Directories cannot be extended.
495 */
496 if (dep->de_Attributes & ATTR_DIRECTORY)
497 return (EISDIR);
498
499 if (length <= dep->de_FileSize)
500 panic("deextend: file too large");
501
502 /*
503 * Compute the number of clusters to allocate.
504 */
505 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
506 if (count > 0) {
507 if (count > pmp->pm_freeclustercount)
508 return (ENOSPC);
509 error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
510 if (error) {
511 /* truncate the added clusters away again */
512 (void) detrunc(dep, dep->de_FileSize, 0, cred);
513 return (error);
514 }
515 }
516
517 /*
518 * Zero extend file range; ubc_zerorange() uses ubc_alloc() and a
519 * memset(); we set the write size so ubc won't read in file data that
520 * is zero'd later.
521 */
522 osize = dep->de_FileSize;
523 dep->de_FileSize = length;
524 uvm_vnp_setwritesize(DETOV(dep), (voff_t)dep->de_FileSize);
525 dep->de_flag |= DE_UPDATE|DE_MODIFIED;
526 ubc_zerorange(&DETOV(dep)->v_uobj, (off_t)osize,
527 (size_t)(round_page(dep->de_FileSize) - osize),
528 UBC_UNMAP_FLAG(DETOV(dep)));
529 uvm_vnp_setsize(DETOV(dep), (voff_t)dep->de_FileSize);
530 return (deupdat(dep, 1));
531 }
532
533 int
msdosfs_reclaim(void * v)534 msdosfs_reclaim(void *v)
535 {
536 struct vop_reclaim_args /* {
537 struct vnode *a_vp;
538 } */ *ap = v;
539 struct vnode *vp = ap->a_vp;
540 struct mount *mp = vp->v_mount;
541 struct denode *dep = VTODE(vp);
542
543 fstrans_start(mp, FSTRANS_LAZY);
544 #ifdef MSDOSFS_DEBUG
545 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
546 dep, dep->de_Name, dep->de_refcnt);
547 #endif
548
549 if (prtactive && vp->v_usecount > 1)
550 vprint("msdosfs_reclaim(): pushing active", vp);
551 /*
552 * Remove the denode from the vnode cache.
553 */
554 vcache_remove(vp->v_mount, &dep->de_key, sizeof(dep->de_key));
555 /*
556 * Purge old data structures associated with the denode.
557 */
558 if (dep->de_devvp) {
559 vrele(dep->de_devvp);
560 dep->de_devvp = 0;
561 }
562 #if 0 /* XXX */
563 dep->de_flag = 0;
564 #endif
565 /*
566 * To interlock with msdosfs_sync().
567 */
568 genfs_node_destroy(vp);
569 mutex_enter(vp->v_interlock);
570 vp->v_data = NULL;
571 mutex_exit(vp->v_interlock);
572 pool_put(&msdosfs_denode_pool, dep);
573 fstrans_done(mp);
574 return (0);
575 }
576
577 int
msdosfs_inactive(void * v)578 msdosfs_inactive(void *v)
579 {
580 struct vop_inactive_args /* {
581 struct vnode *a_vp;
582 bool *a_recycle;
583 } */ *ap = v;
584 struct vnode *vp = ap->a_vp;
585 struct mount *mp = vp->v_mount;
586 struct denode *dep = VTODE(vp);
587 int error = 0;
588
589 #ifdef MSDOSFS_DEBUG
590 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
591 #endif
592
593 fstrans_start(mp, FSTRANS_LAZY);
594 /*
595 * Get rid of denodes related to stale file handles.
596 */
597 if (dep->de_Name[0] == SLOT_DELETED)
598 goto out;
599
600 /*
601 * If the file has been deleted and it is on a read/write
602 * filesystem, then truncate the file, and mark the directory slot
603 * as empty. (This may not be necessary for the dos filesystem.)
604 */
605 #ifdef MSDOSFS_DEBUG
606 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x %s\n",
607 dep, dep->de_refcnt, vp->v_mount->mnt_flag,
608 (vp->v_mount->mnt_flag & MNT_RDONLY) ? "MNT_RDONLY" : "");
609 #endif
610 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
611 if (dep->de_FileSize != 0) {
612 error = detrunc(dep, (u_long)0, 0, NOCRED);
613 }
614 dep->de_Name[0] = SLOT_DELETED;
615 msdosfs_fh_remove(dep->de_pmp,
616 dep->de_dirclust, dep->de_diroffset);
617 }
618 deupdat(dep, 0);
619 out:
620 /*
621 * If we are done with the denode, reclaim it
622 * so that it can be reused immediately.
623 */
624 #ifdef MSDOSFS_DEBUG
625 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n",
626 vp->v_usecount, dep->de_Name[0]);
627 #endif
628 *ap->a_recycle = (dep->de_Name[0] == SLOT_DELETED);
629 VOP_UNLOCK(vp);
630 fstrans_done(mp);
631 return (error);
632 }
633
634 int
msdosfs_gop_alloc(struct vnode * vp,off_t off,off_t len,int flags,kauth_cred_t cred)635 msdosfs_gop_alloc(struct vnode *vp, off_t off,
636 off_t len, int flags, kauth_cred_t cred)
637 {
638 return 0;
639 }
640
641 void
msdosfs_gop_markupdate(struct vnode * vp,int flags)642 msdosfs_gop_markupdate(struct vnode *vp, int flags)
643 {
644 u_long mask = 0;
645
646 if ((flags & GOP_UPDATE_ACCESSED) != 0) {
647 mask = DE_ACCESS;
648 }
649 if ((flags & GOP_UPDATE_MODIFIED) != 0) {
650 mask |= DE_UPDATE;
651 }
652 if (mask) {
653 struct denode *dep = VTODE(vp);
654
655 dep->de_flag |= mask;
656 }
657 }
658
659 int
msdosfs_fh_enter(struct msdosfsmount * pmp,uint32_t dircluster,uint32_t diroffset,uint32_t * genp)660 msdosfs_fh_enter(struct msdosfsmount *pmp,
661 uint32_t dircluster, uint32_t diroffset, uint32_t *genp)
662 {
663 struct fh_key fhkey;
664 struct fh_node *fhp;
665
666 fhkey.fhk_mount = pmp;
667 fhkey.fhk_dircluster = dircluster;
668 fhkey.fhk_diroffset = diroffset;
669
670 mutex_enter(&fh_lock);
671 fhp = rb_tree_find_node(&fh_rbtree, &fhkey);
672 if (fhp == NULL) {
673 mutex_exit(&fh_lock);
674 fhp = pool_get(&fh_pool, PR_WAITOK);
675 mutex_enter(&fh_lock);
676 fhp->fh_key = fhkey;
677 fhp->fh_gen = fh_generation++;
678 rb_tree_insert_node(&fh_rbtree, fhp);
679 }
680 *genp = fhp->fh_gen;
681 mutex_exit(&fh_lock);
682 return 0;
683 }
684
685 int
msdosfs_fh_remove(struct msdosfsmount * pmp,uint32_t dircluster,uint32_t diroffset)686 msdosfs_fh_remove(struct msdosfsmount *pmp,
687 uint32_t dircluster, uint32_t diroffset)
688 {
689 struct fh_key fhkey;
690 struct fh_node *fhp;
691
692 fhkey.fhk_mount = pmp;
693 fhkey.fhk_dircluster = dircluster;
694 fhkey.fhk_diroffset = diroffset;
695
696 mutex_enter(&fh_lock);
697 fhp = rb_tree_find_node(&fh_rbtree, &fhkey);
698 if (fhp == NULL) {
699 mutex_exit(&fh_lock);
700 return ENOENT;
701 }
702 rb_tree_remove_node(&fh_rbtree, fhp);
703 mutex_exit(&fh_lock);
704 pool_put(&fh_pool, fhp);
705 return 0;
706 }
707
708 int
msdosfs_fh_lookup(struct msdosfsmount * pmp,uint32_t dircluster,uint32_t diroffset,uint32_t * genp)709 msdosfs_fh_lookup(struct msdosfsmount *pmp,
710 uint32_t dircluster, uint32_t diroffset, uint32_t *genp)
711 {
712 struct fh_key fhkey;
713 struct fh_node *fhp;
714
715 fhkey.fhk_mount = pmp;
716 fhkey.fhk_dircluster = dircluster;
717 fhkey.fhk_diroffset = diroffset;
718
719 mutex_enter(&fh_lock);
720 fhp = rb_tree_find_node(&fh_rbtree, &fhkey);
721 if (fhp == NULL) {
722 mutex_exit(&fh_lock);
723 return ESTALE;
724 }
725 *genp = fhp->fh_gen;
726 mutex_exit(&fh_lock);
727 return 0;
728 }
729
730 void
msdosfs_fh_destroy(struct msdosfsmount * pmp)731 msdosfs_fh_destroy(struct msdosfsmount *pmp)
732 {
733 struct fh_key fhkey;
734 struct fh_node *fhp, *nfhp;
735
736 fhkey.fhk_mount = pmp;
737 fhkey.fhk_dircluster = 0;
738 fhkey.fhk_diroffset = 0;
739
740 mutex_enter(&fh_lock);
741 for (fhp = rb_tree_find_node_geq(&fh_rbtree, &fhkey);
742 fhp != NULL && fhp->fh_mount == pmp; fhp = nfhp) {
743 nfhp = rb_tree_iterate(&fh_rbtree, fhp, RB_DIR_RIGHT);
744 rb_tree_remove_node(&fh_rbtree, fhp);
745 pool_put(&fh_pool, fhp);
746 }
747 #ifdef DIAGNOSTIC
748 RB_TREE_FOREACH(fhp, &fh_rbtree) {
749 KASSERT(fhp->fh_mount != pmp);
750 }
751 #endif
752 mutex_exit(&fh_lock);
753 }
754