File: | msdosfs/msdosfs_denode.c |
Warning: | line 328, column 5 Value stored to 'error' is never read |
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1 | /* $OpenBSD: msdosfs_denode.c,v 1.66 2020/02/27 09:10:31 mpi Exp $ */ |
2 | /* $NetBSD: msdosfs_denode.c,v 1.23 1997/10/17 11:23:58 ws Exp $ */ |
3 | |
4 | /*- |
5 | * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. |
6 | * Copyright (C) 1994, 1995, 1997 TooLs GmbH. |
7 | * All rights reserved. |
8 | * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). |
9 | * |
10 | * Redistribution and use in source and binary forms, with or without |
11 | * modification, are permitted provided that the following conditions |
12 | * are met: |
13 | * 1. Redistributions of source code must retain the above copyright |
14 | * notice, this list of conditions and the following disclaimer. |
15 | * 2. Redistributions in binary form must reproduce the above copyright |
16 | * notice, this list of conditions and the following disclaimer in the |
17 | * documentation and/or other materials provided with the distribution. |
18 | * 3. All advertising materials mentioning features or use of this software |
19 | * must display the following acknowledgement: |
20 | * This product includes software developed by TooLs GmbH. |
21 | * 4. The name of TooLs GmbH may not be used to endorse or promote products |
22 | * derived from this software without specific prior written permission. |
23 | * |
24 | * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR |
25 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
26 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
27 | * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
28 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
29 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
30 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
31 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
32 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
33 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
34 | */ |
35 | /* |
36 | * Written by Paul Popelka (paulp@uts.amdahl.com) |
37 | * |
38 | * You can do anything you want with this software, just don't say you wrote |
39 | * it, and don't remove this notice. |
40 | * |
41 | * This software is provided "as is". |
42 | * |
43 | * The author supplies this software to be publicly redistributed on the |
44 | * understanding that the author is not responsible for the correct |
45 | * functioning of this software in any circumstances and is not liable for |
46 | * any damages caused by this software. |
47 | * |
48 | * October 1992 |
49 | */ |
50 | |
51 | #include <sys/param.h> |
52 | #include <sys/systm.h> |
53 | #include <sys/mount.h> |
54 | #include <sys/malloc.h> |
55 | #include <sys/buf.h> |
56 | #include <sys/vnode.h> |
57 | #include <sys/lock.h> |
58 | #include <sys/kernel.h> /* defines "time" */ |
59 | #include <sys/dirent.h> |
60 | #include <sys/namei.h> |
61 | |
62 | #include <crypto/siphash.h> |
63 | |
64 | #include <msdosfs/bpb.h> |
65 | #include <msdosfs/msdosfsmount.h> |
66 | #include <msdosfs/direntry.h> |
67 | #include <msdosfs/denode.h> |
68 | #include <msdosfs/fat.h> |
69 | |
70 | u_int msdosfs_dehash(dev_t, uint32_t, uint32_t); |
71 | |
72 | struct denode **dehashtbl; |
73 | SIPHASH_KEY dehashkey; |
74 | u_long dehash; /* size of hash table - 1 */ |
75 | #define DEHASH(dev, dcl, doff)msdosfs_dehash((dev), (dcl), (doff)) msdosfs_dehash((dev), (dcl), (doff)) |
76 | |
77 | static struct denode *msdosfs_hashget(dev_t, uint32_t, uint32_t); |
78 | static int msdosfs_hashins(struct denode *); |
79 | static void msdosfs_hashrem(struct denode *); |
80 | |
81 | /*ARGSUSED*/ |
82 | int |
83 | msdosfs_init(struct vfsconf *vfsp) |
84 | { |
85 | dehashtbl = hashinit(initialvnodes / 2, M_MSDOSFSMNT59, M_WAITOK0x0001, &dehash); |
86 | arc4random_buf(&dehashkey, sizeof(dehashkey)); |
87 | return (0); |
88 | } |
89 | |
90 | u_int |
91 | msdosfs_dehash(dev_t dev, uint32_t dirclust, uint32_t diroff) |
92 | { |
93 | SIPHASH_CTX ctx; |
94 | |
95 | SipHash24_Init(&ctx, &dehashkey)SipHash_Init((&ctx), (&dehashkey)); |
96 | SipHash24_Update(&ctx, &dev, sizeof(dev))SipHash_Update((&ctx), 2, 4, (&dev), (sizeof(dev))); |
97 | SipHash24_Update(&ctx, &dirclust, sizeof(dirclust))SipHash_Update((&ctx), 2, 4, (&dirclust), (sizeof(dirclust ))); |
98 | SipHash24_Update(&ctx, &diroff, sizeof(diroff))SipHash_Update((&ctx), 2, 4, (&diroff), (sizeof(diroff ))); |
99 | |
100 | return (SipHash24_End(&ctx)SipHash_End((&ctx), 2, 4) & dehash); |
101 | } |
102 | |
103 | static struct denode * |
104 | msdosfs_hashget(dev_t dev, uint32_t dirclust, uint32_t diroff) |
105 | { |
106 | struct denode *dep; |
107 | |
108 | for (;;) |
109 | for (dep = dehashtbl[DEHASH(dev, dirclust, diroff)msdosfs_dehash((dev), (dirclust), (diroff))]; ; |
110 | dep = dep->de_next) { |
111 | if (dep == NULL((void *)0)) |
112 | return (NULL((void *)0)); |
113 | if (dirclust == dep->de_dirclust && |
114 | diroff == dep->de_diroffset && |
115 | dev == dep->de_dev && |
116 | dep->de_refcnt != 0) { |
117 | struct vnode *vp = DETOV(dep)((dep)->de_vnode); |
118 | |
119 | if (!vget(vp, LK_EXCLUSIVE0x0001UL)) |
120 | return (dep); |
121 | break; |
122 | } |
123 | } |
124 | /* NOTREACHED */ |
125 | } |
126 | |
127 | static int |
128 | msdosfs_hashins(struct denode *dep) |
129 | { |
130 | struct denode **depp, *deq; |
131 | |
132 | depp = &dehashtbl[DEHASH(dep->de_dev, dep->de_dirclust,msdosfs_dehash((dep->de_dev), (dep->de_dirclust), (dep-> de_diroffset)) |
133 | dep->de_diroffset)msdosfs_dehash((dep->de_dev), (dep->de_dirclust), (dep-> de_diroffset))]; |
134 | |
135 | for (deq = *depp; deq; deq = deq->de_next) { |
136 | if (dep->de_dirclust == deq->de_dirclust && |
137 | dep->de_diroffset == deq->de_diroffset && |
138 | dep->de_dev == deq->de_dev && |
139 | deq->de_refcnt != 0) { |
140 | return (EEXIST17); |
141 | } |
142 | } |
143 | |
144 | if ((deq = *depp) != NULL((void *)0)) |
145 | deq->de_prev = &dep->de_next; |
146 | dep->de_next = deq; |
147 | dep->de_prev = depp; |
148 | *depp = dep; |
149 | return (0); |
150 | } |
151 | |
152 | static void |
153 | msdosfs_hashrem(struct denode *dep) |
154 | { |
155 | struct denode *deq; |
156 | |
157 | if (dep->de_prev == NULL((void *)0)) |
158 | return; |
159 | |
160 | if ((deq = dep->de_next) != NULL((void *)0)) |
161 | deq->de_prev = dep->de_prev; |
162 | *dep->de_prev = deq; |
163 | #ifdef DIAGNOSTIC1 |
164 | dep->de_next = NULL((void *)0); |
165 | dep->de_prev = NULL((void *)0); |
166 | #endif |
167 | } |
168 | |
169 | /* |
170 | * If deget() succeeds it returns with the gotten denode locked(). |
171 | * |
172 | * pmp - address of msdosfsmount structure of the filesystem containing |
173 | * the denode of interest. The pm_dev field and the address of |
174 | * the msdosfsmount structure are used. |
175 | * dirclust - which cluster bp contains, if dirclust is 0 (root directory) |
176 | * diroffset is relative to the beginning of the root directory, |
177 | * otherwise it is cluster relative. |
178 | * diroffset - offset past begin of cluster of denode we want |
179 | * depp - returns the address of the gotten denode. |
180 | */ |
181 | int |
182 | deget(struct msdosfsmount *pmp, uint32_t dirclust, uint32_t diroffset, |
183 | struct denode **depp) |
184 | { |
185 | int error; |
186 | extern const struct vops msdosfs_vops; |
187 | struct direntry *direntptr; |
188 | struct denode *ldep; |
189 | struct vnode *nvp; |
190 | struct buf *bp; |
191 | |
192 | #ifdef MSDOSFS_DEBUG |
193 | printf("deget(pmp %p, dirclust %d, diroffset %x, depp %p)\n", |
194 | pmp, dirclust, diroffset, depp); |
195 | #endif |
196 | |
197 | /* |
198 | * On FAT32 filesystems, root is a (more or less) normal |
199 | * directory |
200 | */ |
201 | if (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff) && dirclust == MSDOSFSROOT0) |
202 | dirclust = pmp->pm_rootdirblk; |
203 | |
204 | /* |
205 | * See if the denode is in the denode cache. Use the location of |
206 | * the directory entry to compute the hash value. For subdir use |
207 | * address of "." entry. For root dir (if not FAT32) use cluster |
208 | * MSDOSFSROOT, offset MSDOSFSROOT_OFS |
209 | * |
210 | * NOTE: The check for de_refcnt > 0 below insures the denode being |
211 | * examined does not represent an unlinked but still open file. |
212 | * These files are not to be accessible even when the directory |
213 | * entry that represented the file happens to be reused while the |
214 | * deleted file is still open. |
215 | */ |
216 | retry: |
217 | ldep = msdosfs_hashget(pmp->pm_dev, dirclust, diroffset); |
218 | if (ldep) { |
219 | *depp = ldep; |
220 | return (0); |
221 | } |
222 | |
223 | /* |
224 | * Directory entry was not in cache, have to create a vnode and |
225 | * copy it from the passed disk buffer. |
226 | */ |
227 | /* getnewvnode() does a vref() on the vnode */ |
228 | error = getnewvnode(VT_MSDOSFS, pmp->pm_mountp, &msdosfs_vops, &nvp); |
229 | if (error) { |
230 | *depp = 0; |
231 | return (error); |
232 | } |
233 | ldep = malloc(sizeof(*ldep), M_MSDOSFSNODE61, M_WAITOK0x0001 | M_ZERO0x0008); |
234 | rrw_init_flags(&ldep->de_lock, "denode", RWL_DUPOK | RWL_IS_VNODE)_rrw_init_flags(&ldep->de_lock, "denode", 0, ((void *) 0)); |
235 | nvp->v_data = ldep; |
236 | ldep->de_vnode = nvp; |
237 | ldep->de_flag = 0; |
238 | ldep->de_devvp = 0; |
239 | ldep->de_lockf = 0; |
240 | ldep->de_dev = pmp->pm_dev; |
241 | ldep->de_dirclust = dirclust; |
242 | ldep->de_diroffset = diroffset; |
243 | fc_purge(ldep, 0); /* init the fat cache for this denode */ |
244 | |
245 | /* |
246 | * Insert the denode into the hash queue and lock the denode so it |
247 | * can't be accessed until we've read it in and have done what we |
248 | * need to it. |
249 | */ |
250 | vn_lock(nvp, LK_EXCLUSIVE0x0001UL | LK_RETRY0x2000UL); |
251 | error = msdosfs_hashins(ldep); |
252 | |
253 | if (error) { |
254 | vput (nvp); |
255 | |
256 | if (error == EEXIST17) |
257 | goto retry; |
258 | |
259 | return (error); |
260 | } |
261 | |
262 | ldep->de_pmp = pmp; |
263 | ldep->de_devvp = pmp->pm_devvp; |
264 | ldep->de_refcnt = 1; |
265 | /* |
266 | * Copy the directory entry into the denode area of the vnode. |
267 | */ |
268 | if ((dirclust == MSDOSFSROOT0 |
269 | || (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff) && dirclust == pmp->pm_rootdirblk)) |
270 | && diroffset == MSDOSFSROOT_OFS0x1fffffff) { |
271 | /* |
272 | * Directory entry for the root directory. There isn't one, |
273 | * so we manufacture one. We should probably rummage |
274 | * through the root directory and find a label entry (if it |
275 | * exists), and then use the time and date from that entry |
276 | * as the time and date for the root denode. |
277 | */ |
278 | nvp->v_flag |= VROOT0x0001; /* should be further down XXX */ |
279 | |
280 | ldep->de_Attributes = ATTR_DIRECTORY0x10; |
281 | if (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff)) |
282 | ldep->de_StartCluster = pmp->pm_rootdirblk; |
283 | /* de_FileSize will be filled in further down */ |
284 | else { |
285 | ldep->de_StartCluster = MSDOSFSROOT0; |
286 | ldep->de_FileSize = pmp->pm_rootdirsize * pmp->pm_BytesPerSecpm_bpb.bpbBytesPerSec; |
287 | } |
288 | /* |
289 | * fill in time and date so that dos2unixtime() doesn't |
290 | * spit up when called from msdosfs_getattr() with root |
291 | * denode |
292 | */ |
293 | ldep->de_CTime = 0x0000; /* 00:00:00 */ |
294 | ldep->de_CTimeHundredth = 0; |
295 | ldep->de_CDate = (0 << DD_YEAR_SHIFT9) | (1 << DD_MONTH_SHIFT5) |
296 | | (1 << DD_DAY_SHIFT0); |
297 | /* Jan 1, 1980 */ |
298 | ldep->de_ADate = ldep->de_CDate; |
299 | ldep->de_MTime = ldep->de_CTime; |
300 | ldep->de_MDate = ldep->de_CDate; |
301 | /* leave the other fields as garbage */ |
302 | } else { |
303 | error = readep(pmp, dirclust, diroffset, &bp, &direntptr); |
304 | if (error) |
305 | return (error); |
306 | DE_INTERNALIZE(ldep, direntptr)(bcopy((direntptr)->deName, (ldep)->de_Name, 8), bcopy( (direntptr)->deExtension, (ldep)->de_Name + 8, 3), (ldep )->de_Attributes = (direntptr)->deAttributes, (ldep)-> de_CTimeHundredth = (direntptr)->deCTimeHundredth, (ldep)-> de_CTime = *((u_int16_t *)((direntptr)->deCTime)), (ldep)-> de_CDate = *((u_int16_t *)((direntptr)->deCDate)), (ldep)-> de_ADate = *((u_int16_t *)((direntptr)->deADate)), (ldep)-> de_MTime = *((u_int16_t *)((direntptr)->deMTime)), (ldep)-> de_MDate = *((u_int16_t *)((direntptr)->deMDate)), (ldep)-> de_StartCluster = *((u_int16_t *)((direntptr)->deStartCluster )), (ldep)->de_FileSize = *((u_int32_t *)((direntptr)-> deFileSize)), (((ldep)->de_pmp->pm_fatmask == 0x0fffffff ) ? (((ldep))->de_StartCluster |= *((u_int16_t *)(((direntptr ))->deHighClust)) << 16) : 0)); |
307 | brelse(bp); |
308 | } |
309 | |
310 | /* |
311 | * Fill in a few fields of the vnode and finish filling in the |
312 | * denode. Then return the address of the found denode. |
313 | */ |
314 | if (ldep->de_Attributes & ATTR_DIRECTORY0x10) { |
315 | /* |
316 | * Since DOS directory entries that describe directories |
317 | * have 0 in the filesize field, we take this opportunity |
318 | * to find out the length of the directory and plug it into |
319 | * the denode structure. |
320 | */ |
321 | uint32_t size; |
322 | |
323 | nvp->v_type = VDIR; |
324 | if (ldep->de_StartCluster != MSDOSFSROOT0) { |
325 | error = pcbmap(ldep, CLUST_END0xffffffff, 0, &size, 0); |
326 | if (error == E2BIG7) { |
327 | ldep->de_FileSize = de_cn2off(pmp, size)((size) << (pmp)->pm_cnshift); |
328 | error = 0; |
Value stored to 'error' is never read | |
329 | } else if (error) { |
330 | printf("deget(): pcbmap returned %d\n", error); |
331 | return (error); |
332 | } |
333 | } |
334 | } else |
335 | nvp->v_type = VREG; |
336 | vref(ldep->de_devvp); |
337 | *depp = ldep; |
338 | return (0); |
339 | } |
340 | |
341 | int |
342 | deupdat(struct denode *dep, int waitfor) |
343 | { |
344 | struct buf *bp; |
345 | struct direntry *dirp; |
346 | int error; |
347 | struct timespec ts; |
348 | |
349 | if (DETOV(dep)((dep)->de_vnode)->v_mount->mnt_flag & MNT_RDONLY0x00000001) |
350 | return (0); |
351 | getnanotime(&ts); |
352 | DETIMES(dep, &ts, &ts, &ts)if ((dep)->de_flag & (0x0004 | 0x0008 | 0x0010)) { (dep )->de_flag |= 0x0020; if ((dep)->de_flag & 0x0004) { unix2dostime((&ts), &(dep)->de_MDate, &(dep)-> de_MTime, ((void *)0)); (dep)->de_Attributes |= 0x20; } if (!((dep)->de_pmp->pm_flags & 0x04)) { if ((dep)-> de_flag & 0x0010) unix2dostime((&ts), &(dep)-> de_ADate, ((void *)0), ((void *)0)); if ((dep)->de_flag & 0x0008) unix2dostime((&ts), &(dep)->de_CDate, & (dep)->de_CTime, &(dep)->de_CTimeHundredth); } (dep )->de_flag &= ~(0x0004 | 0x0008 | 0x0010); }; |
353 | if ((dep->de_flag & DE_MODIFIED0x0020) == 0) |
354 | return (0); |
355 | dep->de_flag &= ~DE_MODIFIED0x0020; |
356 | if (dep->de_Attributes & ATTR_DIRECTORY0x10) |
357 | return (0); |
358 | if (dep->de_refcnt <= 0) |
359 | return (0); |
360 | error = readde(dep, &bp, &dirp); |
361 | if (error) |
362 | return (error); |
363 | DE_EXTERNALIZE(dirp, dep)(bcopy((dep)->de_Name, (dirp)->deName, 8), bcopy((dep)-> de_Name + 8, (dirp)->deExtension, 3), (dirp)->deAttributes = (dep)->de_Attributes, (dirp)->deLowerCase = 0x08 | 0x10 , (dirp)->deCTimeHundredth = (dep)->de_CTimeHundredth, ( *((u_int16_t *)((dirp)->deCTime)) = ((dep)->de_CTime)), (*((u_int16_t *)((dirp)->deCDate)) = ((dep)->de_CDate) ), (*((u_int16_t *)((dirp)->deADate)) = ((dep)->de_ADate )), (*((u_int16_t *)((dirp)->deMTime)) = ((dep)->de_MTime )), (*((u_int16_t *)((dirp)->deMDate)) = ((dep)->de_MDate )), (*((u_int16_t *)((dirp)->deStartCluster)) = ((dep)-> de_StartCluster)), (*((u_int32_t *)((dirp)->deFileSize)) = (((dep)->de_Attributes & 0x10) ? 0 : (dep)->de_FileSize )), (*((u_int16_t *)((dirp)->deHighClust)) = (((dep)->de_pmp ->pm_fatmask == 0x0fffffff) ? (dep)->de_StartCluster >> 16 : 0))); |
364 | if (waitfor) |
365 | return (bwrite(bp)); |
366 | else { |
367 | bdwrite(bp); |
368 | return (0); |
369 | } |
370 | } |
371 | |
372 | /* |
373 | * Truncate the file described by dep to the length specified by length. |
374 | */ |
375 | int |
376 | detrunc(struct denode *dep, uint32_t length, int flags, struct ucred *cred, |
377 | struct proc *p) |
378 | { |
379 | int error; |
380 | int allerror; |
381 | int vflags; |
382 | uint32_t eofentry; |
383 | uint32_t chaintofree = 0; |
384 | daddr_t bn; |
385 | int boff; |
386 | int isadir = dep->de_Attributes & ATTR_DIRECTORY0x10; |
387 | struct buf *bp; |
388 | struct msdosfsmount *pmp = dep->de_pmp; |
389 | |
390 | #ifdef MSDOSFS_DEBUG |
391 | printf("detrunc(): file %.11s, length %u, flags %d\n", |
392 | dep->de_Name, length, flags); |
393 | #endif |
394 | |
395 | /* |
396 | * Disallow attempts to truncate the root directory since it is of |
397 | * fixed size. That's just the way dos filesystems are. We use |
398 | * the VROOT bit in the vnode because checking for the directory |
399 | * bit and a startcluster of 0 in the denode is not adequate to |
400 | * recognize the root directory at this point in a file or |
401 | * directory's life. |
402 | */ |
403 | if ((DETOV(dep)((dep)->de_vnode)->v_flag & VROOT0x0001) && !FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff)) { |
404 | printf("detrunc(): can't truncate root directory, clust %u, offset %u\n", |
405 | dep->de_dirclust, dep->de_diroffset); |
406 | return (EINVAL22); |
407 | } |
408 | |
409 | uvm_vnp_setsize(DETOV(dep)((dep)->de_vnode), length); |
410 | |
411 | if (dep->de_FileSize < length) |
412 | return (deextend(dep, length, cred)); |
413 | |
414 | /* |
415 | * If the desired length is 0 then remember the starting cluster of |
416 | * the file and set the StartCluster field in the directory entry |
417 | * to 0. If the desired length is not zero, then get the number of |
418 | * the last cluster in the shortened file. Then get the number of |
419 | * the first cluster in the part of the file that is to be freed. |
420 | * Then set the next cluster pointer in the last cluster of the |
421 | * file to CLUST_EOFE. |
422 | */ |
423 | if (length == 0) { |
424 | chaintofree = dep->de_StartCluster; |
425 | dep->de_StartCluster = 0; |
426 | eofentry = ~0; |
427 | } else { |
428 | error = pcbmap(dep, de_clcount(pmp, length)(((length) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift ) - 1, 0, |
429 | &eofentry, 0); |
430 | if (error) { |
431 | #ifdef MSDOSFS_DEBUG |
432 | printf("detrunc(): pcbmap fails %d\n", error); |
433 | #endif |
434 | return (error); |
435 | } |
436 | } |
437 | |
438 | fc_purge(dep, de_clcount(pmp, length)(((length) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift )); |
439 | |
440 | /* |
441 | * If the new length is not a multiple of the cluster size then we |
442 | * must zero the tail end of the new last cluster in case it |
443 | * becomes part of the file again because of a seek. |
444 | */ |
445 | if ((boff = length & pmp->pm_crbomask) != 0) { |
446 | if (isadir) { |
447 | bn = cntobn(pmp, eofentry)((((eofentry)-2) << (((pmp))->pm_cnshift - ((pmp))-> pm_bnshift)) + (pmp)->pm_firstcluster); |
448 | error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, &bp); |
449 | } else { |
450 | bn = de_blk(pmp, length)((((((length)) >> ((pmp))->pm_cnshift)) << ((pmp )->pm_cnshift - (pmp)->pm_bnshift))); |
451 | error = bread(DETOV(dep)((dep)->de_vnode), bn, pmp->pm_bpcluster, &bp); |
452 | } |
453 | if (error) { |
454 | brelse(bp); |
455 | #ifdef MSDOSFS_DEBUG |
456 | printf("detrunc(): bread fails %d\n", error); |
457 | #endif |
458 | return (error); |
459 | } |
460 | uvm_vnp_uncache(DETOV(dep)((dep)->de_vnode)); |
461 | /* |
462 | * is this the right place for it? |
463 | */ |
464 | bzero(bp->b_data + boff, pmp->pm_bpcluster - boff)__builtin_bzero((bp->b_data + boff), (pmp->pm_bpcluster - boff)); |
465 | if (flags & IO_SYNC0x04) |
466 | bwrite(bp); |
467 | else |
468 | bdwrite(bp); |
469 | } |
470 | |
471 | /* |
472 | * Write out the updated directory entry. Even if the update fails |
473 | * we free the trailing clusters. |
474 | */ |
475 | dep->de_FileSize = length; |
476 | if (!isadir) |
477 | dep->de_flag |= DE_UPDATE0x0004|DE_MODIFIED0x0020; |
478 | vflags = (length > 0 ? V_SAVE0x0001 : 0) | V_SAVEMETA0x0002; |
479 | vinvalbuf(DETOV(dep)((dep)->de_vnode), vflags, cred, p, 0, INFSLP0xffffffffffffffffULL); |
480 | allerror = deupdat(dep, 1); |
481 | #ifdef MSDOSFS_DEBUG |
482 | printf("detrunc(): allerror %d, eofentry %d\n", |
483 | allerror, eofentry); |
484 | #endif |
485 | |
486 | /* |
487 | * If we need to break the cluster chain for the file then do it |
488 | * now. |
489 | */ |
490 | if (eofentry != ~0) { |
491 | error = fatentry(FAT_GET_AND_SET(0x0001 | 0x0002), pmp, eofentry, |
492 | &chaintofree, CLUST_EOFE0xffffffff); |
493 | if (error) { |
494 | #ifdef MSDOSFS_DEBUG |
495 | printf("detrunc(): fatentry errors %d\n", error); |
496 | #endif |
497 | return (error); |
498 | } |
499 | fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),(dep)->de_fc[1].fc_frcn = ((length - 1) >> (pmp)-> pm_cnshift); (dep)->de_fc[1].fc_fsrcn = eofentry; |
500 | eofentry)(dep)->de_fc[1].fc_frcn = ((length - 1) >> (pmp)-> pm_cnshift); (dep)->de_fc[1].fc_fsrcn = eofentry;; |
501 | } |
502 | |
503 | /* |
504 | * Now free the clusters removed from the file because of the |
505 | * truncation. |
506 | */ |
507 | if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree)((((chaintofree) | ~(pmp)->pm_fatmask) & 0xfffffff8) == 0xfffffff8)) |
508 | freeclusterchain(pmp, chaintofree); |
509 | |
510 | return (allerror); |
511 | } |
512 | |
513 | /* |
514 | * Extend the file described by dep to length specified by length. |
515 | */ |
516 | int |
517 | deextend(struct denode *dep, uint32_t length, struct ucred *cred) |
518 | { |
519 | struct msdosfsmount *pmp = dep->de_pmp; |
520 | uint32_t count; |
521 | int error; |
522 | |
523 | /* |
524 | * The root of a DOS filesystem cannot be extended. |
525 | */ |
526 | if ((DETOV(dep)((dep)->de_vnode)->v_flag & VROOT0x0001) && !FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff)) |
527 | return (EINVAL22); |
528 | |
529 | /* |
530 | * Directories cannot be extended. |
531 | */ |
532 | if (dep->de_Attributes & ATTR_DIRECTORY0x10) |
533 | return (EISDIR21); |
534 | |
535 | if (length <= dep->de_FileSize) |
536 | panic("deextend: file too large"); |
537 | |
538 | /* |
539 | * Compute the number of clusters to allocate. |
540 | */ |
541 | count = de_clcount(pmp, length)(((length) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift ) - de_clcount(pmp, dep->de_FileSize)(((dep->de_FileSize) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift); |
542 | if (count > 0) { |
543 | if (count > pmp->pm_freeclustercount) |
544 | return (ENOSPC28); |
545 | error = extendfile(dep, count, NULL((void *)0), NULL((void *)0), DE_CLEAR1); |
546 | if (error) { |
547 | /* truncate the added clusters away again */ |
548 | (void) detrunc(dep, dep->de_FileSize, 0, cred, NULL((void *)0)); |
549 | return (error); |
550 | } |
551 | } |
552 | |
553 | dep->de_FileSize = length; |
554 | dep->de_flag |= DE_UPDATE0x0004|DE_MODIFIED0x0020; |
555 | return (deupdat(dep, 1)); |
556 | } |
557 | |
558 | /* |
559 | * Move a denode to its correct hash queue after the file it represents has |
560 | * been moved to a new directory. |
561 | */ |
562 | void |
563 | reinsert(struct denode *dep) |
564 | { |
565 | /* |
566 | * Fix up the denode cache. If the denode is for a directory, |
567 | * there is nothing to do since the hash is based on the starting |
568 | * cluster of the directory file and that hasn't changed. If for a |
569 | * file the hash is based on the location of the directory entry, |
570 | * so we must remove it from the cache and re-enter it with the |
571 | * hash based on the new location of the directory entry. |
572 | */ |
573 | if (dep->de_Attributes & ATTR_DIRECTORY0x10) |
574 | return; |
575 | msdosfs_hashrem(dep); |
576 | msdosfs_hashins(dep); |
577 | } |
578 | |
579 | int |
580 | msdosfs_reclaim(void *v) |
581 | { |
582 | struct vop_reclaim_args *ap = v; |
583 | struct vnode *vp = ap->a_vp; |
584 | struct denode *dep = VTODE(vp)((struct denode *)(vp)->v_data); |
585 | #ifdef DIAGNOSTIC1 |
586 | extern int prtactive; |
587 | |
588 | if (prtactive && vp->v_usecount != 0) |
589 | vprint("msdosfs_reclaim(): pushing active", vp); |
590 | #endif |
591 | |
592 | #ifdef MSDOSFS_DEBUG |
593 | printf("msdosfs_reclaim(): dep %p, file %.11s, refcnt %ld\n", |
594 | dep, dep->de_Name, dep->de_refcnt); |
595 | #endif |
596 | |
597 | /* |
598 | * Remove the denode from its hash chain. |
599 | */ |
600 | msdosfs_hashrem(dep); |
601 | /* |
602 | * Purge old data structures associated with the denode. |
603 | */ |
604 | cache_purge(vp); |
605 | if (dep->de_devvp) { |
606 | vrele(dep->de_devvp); |
607 | dep->de_devvp = 0; |
608 | } |
609 | #if 0 /* XXX */ |
610 | dep->de_flag = 0; |
611 | #endif |
612 | free(dep, M_MSDOSFSNODE61, 0); |
613 | vp->v_data = NULL((void *)0); |
614 | return (0); |
615 | } |
616 | |
617 | int |
618 | msdosfs_inactive(void *v) |
619 | { |
620 | struct vop_inactive_args *ap = v; |
621 | struct vnode *vp = ap->a_vp; |
622 | struct denode *dep = VTODE(vp)((struct denode *)(vp)->v_data); |
623 | int error; |
624 | #ifdef DIAGNOSTIC1 |
625 | extern int prtactive; |
626 | |
627 | if (prtactive && vp->v_usecount != 0) |
628 | vprint("msdosfs_inactive(): pushing active", vp); |
629 | #endif |
630 | |
631 | #ifdef MSDOSFS_DEBUG |
632 | printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, |
633 | dep->de_Name[0]); |
634 | #endif |
635 | |
636 | error = 0; |
637 | |
638 | /* |
639 | * Get rid of denodes related to stale file handles. |
640 | */ |
641 | if (dep->de_Name[0] == SLOT_DELETED0xe5) |
642 | goto out; |
643 | |
644 | /* |
645 | * If the file has been deleted and it is on a read/write |
646 | * filesystem, then truncate the file, and mark the directory slot |
647 | * as empty. (This may not be necessary for the dos filesystem.) |
648 | */ |
649 | #ifdef MSDOSFS_DEBUG |
650 | printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, " |
651 | "MNT_RDONLY %x\n", dep, dep->de_refcnt, vp->v_mount->mnt_flag, |
652 | MNT_RDONLY0x00000001); |
653 | #endif |
654 | if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY0x00000001) == 0) { |
655 | error = detrunc(dep, (uint32_t)0, 0, NOCRED((struct ucred *)-1), NULL((void *)0)); |
656 | dep->de_Name[0] = SLOT_DELETED0xe5; |
657 | } |
658 | deupdat(dep, 0); |
659 | |
660 | out: |
661 | VOP_UNLOCK(vp); |
662 | /* |
663 | * If we are done with the denode, reclaim it |
664 | * so that it can be reused immediately. |
665 | */ |
666 | #ifdef MSDOSFS_DEBUG |
667 | printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", |
668 | vp->v_usecount, dep->de_Name[0]); |
669 | #endif |
670 | if (dep->de_Name[0] == SLOT_DELETED0xe5) |
671 | vrecycle(vp, ap->a_p); |
672 | return (error); |
673 | } |