| File: | msdosfs/msdosfs_denode.c |
| Warning: | line 327, column 5 Value stored to 'error' is never read |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
| 1 | /* $OpenBSD: msdosfs_denode.c,v 1.68 2023/03/08 04:43:08 guenther 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 | int |
| 82 | msdosfs_init(struct vfsconf *vfsp) |
| 83 | { |
| 84 | dehashtbl = hashinit(initialvnodes / 2, M_MSDOSFSMNT59, M_WAITOK0x0001, &dehash); |
| 85 | arc4random_buf(&dehashkey, sizeof(dehashkey)); |
| 86 | return (0); |
| 87 | } |
| 88 | |
| 89 | u_int |
| 90 | msdosfs_dehash(dev_t dev, uint32_t dirclust, uint32_t diroff) |
| 91 | { |
| 92 | SIPHASH_CTX ctx; |
| 93 | |
| 94 | SipHash24_Init(&ctx, &dehashkey)SipHash_Init((&ctx), (&dehashkey)); |
| 95 | SipHash24_Update(&ctx, &dev, sizeof(dev))SipHash_Update((&ctx), 2, 4, (&dev), (sizeof(dev))); |
| 96 | SipHash24_Update(&ctx, &dirclust, sizeof(dirclust))SipHash_Update((&ctx), 2, 4, (&dirclust), (sizeof(dirclust ))); |
| 97 | SipHash24_Update(&ctx, &diroff, sizeof(diroff))SipHash_Update((&ctx), 2, 4, (&diroff), (sizeof(diroff ))); |
| 98 | |
| 99 | return (SipHash24_End(&ctx)SipHash_End((&ctx), 2, 4) & dehash); |
| 100 | } |
| 101 | |
| 102 | static struct denode * |
| 103 | msdosfs_hashget(dev_t dev, uint32_t dirclust, uint32_t diroff) |
| 104 | { |
| 105 | struct denode *dep; |
| 106 | |
| 107 | for (;;) |
| 108 | for (dep = dehashtbl[DEHASH(dev, dirclust, diroff)msdosfs_dehash((dev), (dirclust), (diroff))]; ; |
| 109 | dep = dep->de_next) { |
| 110 | if (dep == NULL((void *)0)) |
| 111 | return (NULL((void *)0)); |
| 112 | if (dirclust == dep->de_dirclust && |
| 113 | diroff == dep->de_diroffset && |
| 114 | dev == dep->de_dev && |
| 115 | dep->de_refcnt != 0) { |
| 116 | struct vnode *vp = DETOV(dep)((dep)->de_vnode); |
| 117 | |
| 118 | if (!vget(vp, LK_EXCLUSIVE0x0001UL)) |
| 119 | return (dep); |
| 120 | break; |
| 121 | } |
| 122 | } |
| 123 | /* NOTREACHED */ |
| 124 | } |
| 125 | |
| 126 | static int |
| 127 | msdosfs_hashins(struct denode *dep) |
| 128 | { |
| 129 | struct denode **depp, *deq; |
| 130 | |
| 131 | depp = &dehashtbl[DEHASH(dep->de_dev, dep->de_dirclust,msdosfs_dehash((dep->de_dev), (dep->de_dirclust), (dep-> de_diroffset)) |
| 132 | dep->de_diroffset)msdosfs_dehash((dep->de_dev), (dep->de_dirclust), (dep-> de_diroffset))]; |
| 133 | |
| 134 | for (deq = *depp; deq; deq = deq->de_next) { |
| 135 | if (dep->de_dirclust == deq->de_dirclust && |
| 136 | dep->de_diroffset == deq->de_diroffset && |
| 137 | dep->de_dev == deq->de_dev && |
| 138 | deq->de_refcnt != 0) { |
| 139 | return (EEXIST17); |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | if ((deq = *depp) != NULL((void *)0)) |
| 144 | deq->de_prev = &dep->de_next; |
| 145 | dep->de_next = deq; |
| 146 | dep->de_prev = depp; |
| 147 | *depp = dep; |
| 148 | return (0); |
| 149 | } |
| 150 | |
| 151 | static void |
| 152 | msdosfs_hashrem(struct denode *dep) |
| 153 | { |
| 154 | struct denode *deq; |
| 155 | |
| 156 | if (dep->de_prev == NULL((void *)0)) |
| 157 | return; |
| 158 | |
| 159 | if ((deq = dep->de_next) != NULL((void *)0)) |
| 160 | deq->de_prev = dep->de_prev; |
| 161 | *dep->de_prev = deq; |
| 162 | #ifdef DIAGNOSTIC1 |
| 163 | dep->de_next = NULL((void *)0); |
| 164 | dep->de_prev = NULL((void *)0); |
| 165 | #endif |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * If deget() succeeds it returns with the gotten denode locked(). |
| 170 | * |
| 171 | * pmp - address of msdosfsmount structure of the filesystem containing |
| 172 | * the denode of interest. The pm_dev field and the address of |
| 173 | * the msdosfsmount structure are used. |
| 174 | * dirclust - which cluster bp contains, if dirclust is 0 (root directory) |
| 175 | * diroffset is relative to the beginning of the root directory, |
| 176 | * otherwise it is cluster relative. |
| 177 | * diroffset - offset past begin of cluster of denode we want |
| 178 | * depp - returns the address of the gotten denode. |
| 179 | */ |
| 180 | int |
| 181 | deget(struct msdosfsmount *pmp, uint32_t dirclust, uint32_t diroffset, |
| 182 | struct denode **depp) |
| 183 | { |
| 184 | int error; |
| 185 | extern const struct vops msdosfs_vops; |
| 186 | struct direntry *direntptr; |
| 187 | struct denode *ldep; |
| 188 | struct vnode *nvp; |
| 189 | struct buf *bp; |
| 190 | |
| 191 | #ifdef MSDOSFS_DEBUG |
| 192 | printf("deget(pmp %p, dirclust %d, diroffset %x, depp %p)\n", |
| 193 | pmp, dirclust, diroffset, depp); |
| 194 | #endif |
| 195 | |
| 196 | /* |
| 197 | * On FAT32 filesystems, root is a (more or less) normal |
| 198 | * directory |
| 199 | */ |
| 200 | if (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff) && dirclust == MSDOSFSROOT0) |
| 201 | dirclust = pmp->pm_rootdirblk; |
| 202 | |
| 203 | /* |
| 204 | * See if the denode is in the denode cache. Use the location of |
| 205 | * the directory entry to compute the hash value. For subdir use |
| 206 | * address of "." entry. For root dir (if not FAT32) use cluster |
| 207 | * MSDOSFSROOT, offset MSDOSFSROOT_OFS |
| 208 | * |
| 209 | * NOTE: The check for de_refcnt > 0 below insures the denode being |
| 210 | * examined does not represent an unlinked but still open file. |
| 211 | * These files are not to be accessible even when the directory |
| 212 | * entry that represented the file happens to be reused while the |
| 213 | * deleted file is still open. |
| 214 | */ |
| 215 | retry: |
| 216 | ldep = msdosfs_hashget(pmp->pm_dev, dirclust, diroffset); |
| 217 | if (ldep) { |
| 218 | *depp = ldep; |
| 219 | return (0); |
| 220 | } |
| 221 | |
| 222 | /* |
| 223 | * Directory entry was not in cache, have to create a vnode and |
| 224 | * copy it from the passed disk buffer. |
| 225 | */ |
| 226 | /* getnewvnode() does a vref() on the vnode */ |
| 227 | error = getnewvnode(VT_MSDOSFS, pmp->pm_mountp, &msdosfs_vops, &nvp); |
| 228 | if (error) { |
| 229 | *depp = 0; |
| 230 | return (error); |
| 231 | } |
| 232 | ldep = malloc(sizeof(*ldep), M_MSDOSFSNODE61, M_WAITOK0x0001 | M_ZERO0x0008); |
| 233 | rrw_init_flags(&ldep->de_lock, "denode", RWL_DUPOK | RWL_IS_VNODE)_rrw_init_flags(&ldep->de_lock, "denode", 0, ((void *) 0)); |
| 234 | nvp->v_data = ldep; |
| 235 | ldep->de_vnode = nvp; |
| 236 | ldep->de_flag = 0; |
| 237 | ldep->de_devvp = 0; |
| 238 | ldep->de_lockf = 0; |
| 239 | ldep->de_dev = pmp->pm_dev; |
| 240 | ldep->de_dirclust = dirclust; |
| 241 | ldep->de_diroffset = diroffset; |
| 242 | fc_purge(ldep, 0); /* init the fat cache for this denode */ |
| 243 | |
| 244 | /* |
| 245 | * Insert the denode into the hash queue and lock the denode so it |
| 246 | * can't be accessed until we've read it in and have done what we |
| 247 | * need to it. |
| 248 | */ |
| 249 | vn_lock(nvp, LK_EXCLUSIVE0x0001UL | LK_RETRY0x2000UL); |
| 250 | error = msdosfs_hashins(ldep); |
| 251 | |
| 252 | if (error) { |
| 253 | vput (nvp); |
| 254 | |
| 255 | if (error == EEXIST17) |
| 256 | goto retry; |
| 257 | |
| 258 | return (error); |
| 259 | } |
| 260 | |
| 261 | ldep->de_pmp = pmp; |
| 262 | ldep->de_devvp = pmp->pm_devvp; |
| 263 | ldep->de_refcnt = 1; |
| 264 | /* |
| 265 | * Copy the directory entry into the denode area of the vnode. |
| 266 | */ |
| 267 | if ((dirclust == MSDOSFSROOT0 |
| 268 | || (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff) && dirclust == pmp->pm_rootdirblk)) |
| 269 | && diroffset == MSDOSFSROOT_OFS0x1fffffff) { |
| 270 | /* |
| 271 | * Directory entry for the root directory. There isn't one, |
| 272 | * so we manufacture one. We should probably rummage |
| 273 | * through the root directory and find a label entry (if it |
| 274 | * exists), and then use the time and date from that entry |
| 275 | * as the time and date for the root denode. |
| 276 | */ |
| 277 | nvp->v_flag |= VROOT0x0001; /* should be further down XXX */ |
| 278 | |
| 279 | ldep->de_Attributes = ATTR_DIRECTORY0x10; |
| 280 | if (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff)) |
| 281 | ldep->de_StartCluster = pmp->pm_rootdirblk; |
| 282 | /* de_FileSize will be filled in further down */ |
| 283 | else { |
| 284 | ldep->de_StartCluster = MSDOSFSROOT0; |
| 285 | ldep->de_FileSize = pmp->pm_rootdirsize * pmp->pm_BytesPerSecpm_bpb.bpbBytesPerSec; |
| 286 | } |
| 287 | /* |
| 288 | * fill in time and date so that dos2unixtime() doesn't |
| 289 | * spit up when called from msdosfs_getattr() with root |
| 290 | * denode |
| 291 | */ |
| 292 | ldep->de_CTime = 0x0000; /* 00:00:00 */ |
| 293 | ldep->de_CTimeHundredth = 0; |
| 294 | ldep->de_CDate = (0 << DD_YEAR_SHIFT9) | (1 << DD_MONTH_SHIFT5) |
| 295 | | (1 << DD_DAY_SHIFT0); |
| 296 | /* Jan 1, 1980 */ |
| 297 | ldep->de_ADate = ldep->de_CDate; |
| 298 | ldep->de_MTime = ldep->de_CTime; |
| 299 | ldep->de_MDate = ldep->de_CDate; |
| 300 | /* leave the other fields as garbage */ |
| 301 | } else { |
| 302 | error = readep(pmp, dirclust, diroffset, &bp, &direntptr); |
| 303 | if (error) |
| 304 | return (error); |
| 305 | 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)); |
| 306 | brelse(bp); |
| 307 | } |
| 308 | |
| 309 | /* |
| 310 | * Fill in a few fields of the vnode and finish filling in the |
| 311 | * denode. Then return the address of the found denode. |
| 312 | */ |
| 313 | if (ldep->de_Attributes & ATTR_DIRECTORY0x10) { |
| 314 | /* |
| 315 | * Since DOS directory entries that describe directories |
| 316 | * have 0 in the filesize field, we take this opportunity |
| 317 | * to find out the length of the directory and plug it into |
| 318 | * the denode structure. |
| 319 | */ |
| 320 | uint32_t size; |
| 321 | |
| 322 | nvp->v_type = VDIR; |
| 323 | if (ldep->de_StartCluster != MSDOSFSROOT0) { |
| 324 | error = pcbmap(ldep, CLUST_END0xffffffff, 0, &size, 0); |
| 325 | if (error == E2BIG7) { |
| 326 | ldep->de_FileSize = de_cn2off(pmp, size)((size) << (pmp)->pm_cnshift); |
| 327 | error = 0; |
Value stored to 'error' is never read | |
| 328 | } else if (error) { |
| 329 | printf("deget(): pcbmap returned %d\n", error); |
| 330 | return (error); |
| 331 | } |
| 332 | } |
| 333 | } else |
| 334 | nvp->v_type = VREG; |
| 335 | vref(ldep->de_devvp); |
| 336 | *depp = ldep; |
| 337 | return (0); |
| 338 | } |
| 339 | |
| 340 | int |
| 341 | deupdat(struct denode *dep, int waitfor) |
| 342 | { |
| 343 | struct buf *bp; |
| 344 | struct direntry *dirp; |
| 345 | int error; |
| 346 | struct timespec ts; |
| 347 | |
| 348 | if (DETOV(dep)((dep)->de_vnode)->v_mount->mnt_flag & MNT_RDONLY0x00000001) |
| 349 | return (0); |
| 350 | getnanotime(&ts); |
| 351 | 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); }; |
| 352 | if ((dep->de_flag & DE_MODIFIED0x0020) == 0) |
| 353 | return (0); |
| 354 | dep->de_flag &= ~DE_MODIFIED0x0020; |
| 355 | if (dep->de_Attributes & ATTR_DIRECTORY0x10) |
| 356 | return (0); |
| 357 | if (dep->de_refcnt <= 0) |
| 358 | return (0); |
| 359 | error = readde(dep, &bp, &dirp); |
| 360 | if (error) |
| 361 | return (error); |
| 362 | 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))); |
| 363 | if (waitfor) |
| 364 | return (bwrite(bp)); |
| 365 | else { |
| 366 | bdwrite(bp); |
| 367 | return (0); |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | /* |
| 372 | * Truncate the file described by dep to the length specified by length. |
| 373 | */ |
| 374 | int |
| 375 | detrunc(struct denode *dep, uint32_t length, int flags, struct ucred *cred, |
| 376 | struct proc *p) |
| 377 | { |
| 378 | int error; |
| 379 | int allerror; |
| 380 | int vflags; |
| 381 | uint32_t eofentry; |
| 382 | uint32_t chaintofree = 0; |
| 383 | daddr_t bn; |
| 384 | int boff; |
| 385 | int isadir = dep->de_Attributes & ATTR_DIRECTORY0x10; |
| 386 | struct buf *bp; |
| 387 | struct msdosfsmount *pmp = dep->de_pmp; |
| 388 | |
| 389 | #ifdef MSDOSFS_DEBUG |
| 390 | printf("detrunc(): file %.11s, length %u, flags %d\n", |
| 391 | dep->de_Name, length, flags); |
| 392 | #endif |
| 393 | |
| 394 | /* |
| 395 | * Disallow attempts to truncate the root directory since it is of |
| 396 | * fixed size. That's just the way dos filesystems are. We use |
| 397 | * the VROOT bit in the vnode because checking for the directory |
| 398 | * bit and a startcluster of 0 in the denode is not adequate to |
| 399 | * recognize the root directory at this point in a file or |
| 400 | * directory's life. |
| 401 | */ |
| 402 | if ((DETOV(dep)((dep)->de_vnode)->v_flag & VROOT0x0001) && !FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff)) { |
| 403 | printf("detrunc(): can't truncate root directory, clust %u, offset %u\n", |
| 404 | dep->de_dirclust, dep->de_diroffset); |
| 405 | return (EINVAL22); |
| 406 | } |
| 407 | |
| 408 | uvm_vnp_setsize(DETOV(dep)((dep)->de_vnode), length); |
| 409 | |
| 410 | if (dep->de_FileSize < length) |
| 411 | return (deextend(dep, length, cred)); |
| 412 | |
| 413 | /* |
| 414 | * If the desired length is 0 then remember the starting cluster of |
| 415 | * the file and set the StartCluster field in the directory entry |
| 416 | * to 0. If the desired length is not zero, then get the number of |
| 417 | * the last cluster in the shortened file. Then get the number of |
| 418 | * the first cluster in the part of the file that is to be freed. |
| 419 | * Then set the next cluster pointer in the last cluster of the |
| 420 | * file to CLUST_EOFE. |
| 421 | */ |
| 422 | if (length == 0) { |
| 423 | chaintofree = dep->de_StartCluster; |
| 424 | dep->de_StartCluster = 0; |
| 425 | eofentry = ~0; |
| 426 | } else { |
| 427 | error = pcbmap(dep, de_clcount(pmp, length)(((length) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift ) - 1, 0, |
| 428 | &eofentry, 0); |
| 429 | if (error) { |
| 430 | #ifdef MSDOSFS_DEBUG |
| 431 | printf("detrunc(): pcbmap fails %d\n", error); |
| 432 | #endif |
| 433 | return (error); |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | fc_purge(dep, de_clcount(pmp, length)(((length) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift )); |
| 438 | |
| 439 | /* |
| 440 | * If the new length is not a multiple of the cluster size then we |
| 441 | * must zero the tail end of the new last cluster in case it |
| 442 | * becomes part of the file again because of a seek. |
| 443 | */ |
| 444 | if ((boff = length & pmp->pm_crbomask) != 0) { |
| 445 | if (isadir) { |
| 446 | bn = cntobn(pmp, eofentry)((((eofentry)-2) << (((pmp))->pm_cnshift - ((pmp))-> pm_bnshift)) + (pmp)->pm_firstcluster); |
| 447 | error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, &bp); |
| 448 | } else { |
| 449 | bn = de_blk(pmp, length)((((((length)) >> ((pmp))->pm_cnshift)) << ((pmp )->pm_cnshift - (pmp)->pm_bnshift))); |
| 450 | error = bread(DETOV(dep)((dep)->de_vnode), bn, pmp->pm_bpcluster, &bp); |
| 451 | } |
| 452 | if (error) { |
| 453 | brelse(bp); |
| 454 | #ifdef MSDOSFS_DEBUG |
| 455 | printf("detrunc(): bread fails %d\n", error); |
| 456 | #endif |
| 457 | return (error); |
| 458 | } |
| 459 | uvm_vnp_uncache(DETOV(dep)((dep)->de_vnode)); |
| 460 | /* |
| 461 | * is this the right place for it? |
| 462 | */ |
| 463 | bzero(bp->b_data + boff, pmp->pm_bpcluster - boff)__builtin_bzero((bp->b_data + boff), (pmp->pm_bpcluster - boff)); |
| 464 | if (flags & IO_SYNC0x04) |
| 465 | bwrite(bp); |
| 466 | else |
| 467 | bdwrite(bp); |
| 468 | } |
| 469 | |
| 470 | /* |
| 471 | * Write out the updated directory entry. Even if the update fails |
| 472 | * we free the trailing clusters. |
| 473 | */ |
| 474 | dep->de_FileSize = length; |
| 475 | if (!isadir) |
| 476 | dep->de_flag |= DE_UPDATE0x0004|DE_MODIFIED0x0020; |
| 477 | vflags = (length > 0 ? V_SAVE0x0001 : 0) | V_SAVEMETA0x0002; |
| 478 | vinvalbuf(DETOV(dep)((dep)->de_vnode), vflags, cred, p, 0, INFSLP0xffffffffffffffffULL); |
| 479 | allerror = deupdat(dep, 1); |
| 480 | #ifdef MSDOSFS_DEBUG |
| 481 | printf("detrunc(): allerror %d, eofentry %d\n", |
| 482 | allerror, eofentry); |
| 483 | #endif |
| 484 | |
| 485 | /* |
| 486 | * If we need to break the cluster chain for the file then do it |
| 487 | * now. |
| 488 | */ |
| 489 | if (eofentry != ~0) { |
| 490 | error = fatentry(FAT_GET_AND_SET(0x0001 | 0x0002), pmp, eofentry, |
| 491 | &chaintofree, CLUST_EOFE0xffffffff); |
| 492 | if (error) { |
| 493 | #ifdef MSDOSFS_DEBUG |
| 494 | printf("detrunc(): fatentry errors %d\n", error); |
| 495 | #endif |
| 496 | return (error); |
| 497 | } |
| 498 | 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; |
| 499 | eofentry)(dep)->de_fc[1].fc_frcn = ((length - 1) >> (pmp)-> pm_cnshift); (dep)->de_fc[1].fc_fsrcn = eofentry;; |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * Now free the clusters removed from the file because of the |
| 504 | * truncation. |
| 505 | */ |
| 506 | if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree)((((chaintofree) | ~(pmp)->pm_fatmask) & 0xfffffff8) == 0xfffffff8)) |
| 507 | freeclusterchain(pmp, chaintofree); |
| 508 | |
| 509 | return (allerror); |
| 510 | } |
| 511 | |
| 512 | /* |
| 513 | * Extend the file described by dep to length specified by length. |
| 514 | */ |
| 515 | int |
| 516 | deextend(struct denode *dep, uint32_t length, struct ucred *cred) |
| 517 | { |
| 518 | struct msdosfsmount *pmp = dep->de_pmp; |
| 519 | uint32_t count; |
| 520 | int error; |
| 521 | |
| 522 | /* |
| 523 | * The root of a DOS filesystem cannot be extended. |
| 524 | */ |
| 525 | if ((DETOV(dep)((dep)->de_vnode)->v_flag & VROOT0x0001) && !FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff)) |
| 526 | return (EINVAL22); |
| 527 | |
| 528 | /* |
| 529 | * Directories cannot be extended. |
| 530 | */ |
| 531 | if (dep->de_Attributes & ATTR_DIRECTORY0x10) |
| 532 | return (EISDIR21); |
| 533 | |
| 534 | if (length <= dep->de_FileSize) |
| 535 | panic("deextend: file too large"); |
| 536 | |
| 537 | /* |
| 538 | * Compute the number of clusters to allocate. |
| 539 | */ |
| 540 | 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); |
| 541 | if (count > 0) { |
| 542 | if (count > pmp->pm_freeclustercount) |
| 543 | return (ENOSPC28); |
| 544 | error = extendfile(dep, count, NULL((void *)0), NULL((void *)0), DE_CLEAR1); |
| 545 | if (error) { |
| 546 | /* truncate the added clusters away again */ |
| 547 | (void) detrunc(dep, dep->de_FileSize, 0, cred, curproc({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci;})->ci_curproc); |
| 548 | return (error); |
| 549 | } |
| 550 | } |
| 551 | |
| 552 | dep->de_FileSize = length; |
| 553 | dep->de_flag |= DE_UPDATE0x0004|DE_MODIFIED0x0020; |
| 554 | return (deupdat(dep, 1)); |
| 555 | } |
| 556 | |
| 557 | /* |
| 558 | * Move a denode to its correct hash queue after the file it represents has |
| 559 | * been moved to a new directory. |
| 560 | */ |
| 561 | void |
| 562 | reinsert(struct denode *dep) |
| 563 | { |
| 564 | /* |
| 565 | * Fix up the denode cache. If the denode is for a directory, |
| 566 | * there is nothing to do since the hash is based on the starting |
| 567 | * cluster of the directory file and that hasn't changed. If for a |
| 568 | * file the hash is based on the location of the directory entry, |
| 569 | * so we must remove it from the cache and re-enter it with the |
| 570 | * hash based on the new location of the directory entry. |
| 571 | */ |
| 572 | if (dep->de_Attributes & ATTR_DIRECTORY0x10) |
| 573 | return; |
| 574 | msdosfs_hashrem(dep); |
| 575 | msdosfs_hashins(dep); |
| 576 | } |
| 577 | |
| 578 | int |
| 579 | msdosfs_reclaim(void *v) |
| 580 | { |
| 581 | struct vop_reclaim_args *ap = v; |
| 582 | struct vnode *vp = ap->a_vp; |
| 583 | struct denode *dep = VTODE(vp)((struct denode *)(vp)->v_data); |
| 584 | #ifdef DIAGNOSTIC1 |
| 585 | extern int prtactive; |
| 586 | |
| 587 | if (prtactive && vp->v_usecount != 0) |
| 588 | vprint("msdosfs_reclaim(): pushing active", vp); |
| 589 | #endif |
| 590 | |
| 591 | #ifdef MSDOSFS_DEBUG |
| 592 | printf("msdosfs_reclaim(): dep %p, file %.11s, refcnt %ld\n", |
| 593 | dep, dep->de_Name, dep->de_refcnt); |
| 594 | #endif |
| 595 | |
| 596 | /* |
| 597 | * Remove the denode from its hash chain. |
| 598 | */ |
| 599 | msdosfs_hashrem(dep); |
| 600 | /* |
| 601 | * Purge old data structures associated with the denode. |
| 602 | */ |
| 603 | cache_purge(vp); |
| 604 | if (dep->de_devvp) { |
| 605 | vrele(dep->de_devvp); |
| 606 | dep->de_devvp = 0; |
| 607 | } |
| 608 | #if 0 /* XXX */ |
| 609 | dep->de_flag = 0; |
| 610 | #endif |
| 611 | free(dep, M_MSDOSFSNODE61, 0); |
| 612 | vp->v_data = NULL((void *)0); |
| 613 | return (0); |
| 614 | } |
| 615 | |
| 616 | int |
| 617 | msdosfs_inactive(void *v) |
| 618 | { |
| 619 | struct vop_inactive_args *ap = v; |
| 620 | struct vnode *vp = ap->a_vp; |
| 621 | struct denode *dep = VTODE(vp)((struct denode *)(vp)->v_data); |
| 622 | int error; |
| 623 | #ifdef DIAGNOSTIC1 |
| 624 | extern int prtactive; |
| 625 | |
| 626 | if (prtactive && vp->v_usecount != 0) |
| 627 | vprint("msdosfs_inactive(): pushing active", vp); |
| 628 | #endif |
| 629 | |
| 630 | #ifdef MSDOSFS_DEBUG |
| 631 | printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, |
| 632 | dep->de_Name[0]); |
| 633 | #endif |
| 634 | |
| 635 | error = 0; |
| 636 | |
| 637 | /* |
| 638 | * Get rid of denodes related to stale file handles. |
| 639 | */ |
| 640 | if (dep->de_Name[0] == SLOT_DELETED0xe5) |
| 641 | goto out; |
| 642 | |
| 643 | /* |
| 644 | * If the file has been deleted and it is on a read/write |
| 645 | * filesystem, then truncate the file, and mark the directory slot |
| 646 | * as empty. (This may not be necessary for the dos filesystem.) |
| 647 | */ |
| 648 | #ifdef MSDOSFS_DEBUG |
| 649 | printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, " |
| 650 | "MNT_RDONLY %x\n", dep, dep->de_refcnt, vp->v_mount->mnt_flag, |
| 651 | MNT_RDONLY0x00000001); |
| 652 | #endif |
| 653 | if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY0x00000001) == 0) { |
| 654 | error = detrunc(dep, (uint32_t)0, 0, NOCRED((struct ucred *)-1), ap->a_p); |
| 655 | dep->de_Name[0] = SLOT_DELETED0xe5; |
| 656 | } |
| 657 | deupdat(dep, 0); |
| 658 | |
| 659 | out: |
| 660 | VOP_UNLOCK(vp); |
| 661 | /* |
| 662 | * If we are done with the denode, reclaim it |
| 663 | * so that it can be reused immediately. |
| 664 | */ |
| 665 | #ifdef MSDOSFS_DEBUG |
| 666 | printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", |
| 667 | vp->v_usecount, dep->de_Name[0]); |
| 668 | #endif |
| 669 | if (dep->de_Name[0] == SLOT_DELETED0xe5) |
| 670 | vrecycle(vp, ap->a_p); |
| 671 | return (error); |
| 672 | } |