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sys/fs/msdosfs/msdosfs_vnops.c
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1 /* $FreeBSD: releng/5.0/sys/fs/msdosfs/msdosfs_vnops.c 103936 2002-09-25 02:32:42Z jeff $ */ 2 /* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg 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/namei.h> 54 #include <sys/resourcevar.h> /* defines plimit structure in proc struct */ 55 #include <sys/kernel.h> 56 #include <sys/stat.h> 57 #include <sys/bio.h> 58 #include <sys/buf.h> 59 #include <sys/proc.h> 60 #include <sys/mount.h> 61 #include <sys/unistd.h> 62 #include <sys/vnode.h> 63 #include <sys/malloc.h> 64 #include <sys/dirent.h> 65 #include <sys/signalvar.h> 66 67 #include <vm/vm.h> 68 #include <vm/vm_extern.h> 69 #include <vm/vnode_pager.h> 70 71 #include <machine/mutex.h> 72 73 #include <fs/msdosfs/bpb.h> 74 #include <fs/msdosfs/direntry.h> 75 #include <fs/msdosfs/denode.h> 76 #include <fs/msdosfs/msdosfsmount.h> 77 #include <fs/msdosfs/fat.h> 78 79 #define DOS_FILESIZE_MAX 0xffffffff 80 81 /* 82 * Prototypes for MSDOSFS vnode operations 83 */ 84 static int msdosfs_create(struct vop_create_args *); 85 static int msdosfs_mknod(struct vop_mknod_args *); 86 static int msdosfs_close(struct vop_close_args *); 87 static int msdosfs_access(struct vop_access_args *); 88 static int msdosfs_getattr(struct vop_getattr_args *); 89 static int msdosfs_setattr(struct vop_setattr_args *); 90 static int msdosfs_read(struct vop_read_args *); 91 static int msdosfs_write(struct vop_write_args *); 92 static int msdosfs_fsync(struct vop_fsync_args *); 93 static int msdosfs_remove(struct vop_remove_args *); 94 static int msdosfs_link(struct vop_link_args *); 95 static int msdosfs_rename(struct vop_rename_args *); 96 static int msdosfs_mkdir(struct vop_mkdir_args *); 97 static int msdosfs_rmdir(struct vop_rmdir_args *); 98 static int msdosfs_symlink(struct vop_symlink_args *); 99 static int msdosfs_readdir(struct vop_readdir_args *); 100 static int msdosfs_bmap(struct vop_bmap_args *); 101 static int msdosfs_strategy(struct vop_strategy_args *); 102 static int msdosfs_print(struct vop_print_args *); 103 static int msdosfs_pathconf(struct vop_pathconf_args *ap); 104 105 /* 106 * Some general notes: 107 * 108 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 109 * read/written using the vnode for the filesystem. Blocks that represent 110 * the contents of a file are read/written using the vnode for the file 111 * (including directories when they are read/written as files). This 112 * presents problems for the dos filesystem because data that should be in 113 * an inode (if dos had them) resides in the directory itself. Since we 114 * must update directory entries without the benefit of having the vnode 115 * for the directory we must use the vnode for the filesystem. This means 116 * that when a directory is actually read/written (via read, write, or 117 * readdir, or seek) we must use the vnode for the filesystem instead of 118 * the vnode for the directory as would happen in ufs. This is to insure we 119 * retreive the correct block from the buffer cache since the hash value is 120 * based upon the vnode address and the desired block number. 121 */ 122 123 /* 124 * Create a regular file. On entry the directory to contain the file being 125 * created is locked. We must release before we return. We must also free 126 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or 127 * only if the SAVESTART bit in cn_flags is clear on success. 128 */ 129 static int 130 msdosfs_create(ap) 131 struct vop_create_args /* { 132 struct vnode *a_dvp; 133 struct vnode **a_vpp; 134 struct componentname *a_cnp; 135 struct vattr *a_vap; 136 } */ *ap; 137 { 138 struct componentname *cnp = ap->a_cnp; 139 struct denode ndirent; 140 struct denode *dep; 141 struct denode *pdep = VTODE(ap->a_dvp); 142 struct timespec ts; 143 int error; 144 145 #ifdef MSDOSFS_DEBUG 146 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 147 #endif 148 149 /* 150 * If this is the root directory and there is no space left we 151 * can't do anything. This is because the root directory can not 152 * change size. 153 */ 154 if (pdep->de_StartCluster == MSDOSFSROOT 155 && pdep->de_fndoffset >= pdep->de_FileSize) { 156 error = ENOSPC; 157 goto bad; 158 } 159 160 /* 161 * Create a directory entry for the file, then call createde() to 162 * have it installed. NOTE: DOS files are always executable. We 163 * use the absence of the owner write bit to make the file 164 * readonly. 165 */ 166 #ifdef DIAGNOSTIC 167 if ((cnp->cn_flags & HASBUF) == 0) 168 panic("msdosfs_create: no name"); 169 #endif 170 bzero(&ndirent, sizeof(ndirent)); 171 error = uniqdosname(pdep, cnp, ndirent.de_Name); 172 if (error) 173 goto bad; 174 175 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ? 176 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; 177 ndirent.de_LowerCase = 0; 178 ndirent.de_StartCluster = 0; 179 ndirent.de_FileSize = 0; 180 ndirent.de_dev = pdep->de_dev; 181 ndirent.de_devvp = pdep->de_devvp; 182 ndirent.de_pmp = pdep->de_pmp; 183 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 184 getnanotime(&ts); 185 DETIMES(&ndirent, &ts, &ts, &ts); 186 error = createde(&ndirent, pdep, &dep, cnp); 187 if (error) 188 goto bad; 189 *ap->a_vpp = DETOV(dep); 190 return (0); 191 192 bad: 193 return (error); 194 } 195 196 static int 197 msdosfs_mknod(ap) 198 struct vop_mknod_args /* { 199 struct vnode *a_dvp; 200 struct vnode **a_vpp; 201 struct componentname *a_cnp; 202 struct vattr *a_vap; 203 } */ *ap; 204 { 205 return (EINVAL); 206 } 207 208 static int 209 msdosfs_close(ap) 210 struct vop_close_args /* { 211 struct vnode *a_vp; 212 int a_fflag; 213 struct ucred *a_cred; 214 struct thread *a_td; 215 } */ *ap; 216 { 217 struct vnode *vp = ap->a_vp; 218 struct denode *dep = VTODE(vp); 219 struct timespec ts; 220 221 VI_LOCK(vp); 222 if (vp->v_usecount > 1) { 223 getnanotime(&ts); 224 DETIMES(dep, &ts, &ts, &ts); 225 } 226 VI_UNLOCK(vp); 227 return 0; 228 } 229 230 static int 231 msdosfs_access(ap) 232 struct vop_access_args /* { 233 struct vnode *a_vp; 234 int a_mode; 235 struct ucred *a_cred; 236 struct thread *a_td; 237 } */ *ap; 238 { 239 struct vnode *vp = ap->a_vp; 240 struct denode *dep = VTODE(ap->a_vp); 241 struct msdosfsmount *pmp = dep->de_pmp; 242 mode_t file_mode, mode = ap->a_mode; 243 244 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) | 245 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH)); 246 file_mode &= pmp->pm_mask; 247 248 /* 249 * Disallow write attempts on read-only filesystems; 250 * unless the file is a socket, fifo, or a block or 251 * character device resident on the filesystem. 252 */ 253 if (mode & VWRITE) { 254 switch (vp->v_type) { 255 case VDIR: 256 case VLNK: 257 case VREG: 258 if (vp->v_mount->mnt_flag & MNT_RDONLY) 259 return (EROFS); 260 break; 261 default: 262 break; 263 } 264 } 265 266 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, 267 ap->a_mode, ap->a_cred, NULL)); 268 } 269 270 static int 271 msdosfs_getattr(ap) 272 struct vop_getattr_args /* { 273 struct vnode *a_vp; 274 struct vattr *a_vap; 275 struct ucred *a_cred; 276 struct thread *a_td; 277 } */ *ap; 278 { 279 struct denode *dep = VTODE(ap->a_vp); 280 struct msdosfsmount *pmp = dep->de_pmp; 281 struct vattr *vap = ap->a_vap; 282 mode_t mode; 283 struct timespec ts; 284 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 285 u_long fileid; 286 287 getnanotime(&ts); 288 DETIMES(dep, &ts, &ts, &ts); 289 vap->va_fsid = dev2udev(dep->de_dev); 290 /* 291 * The following computation of the fileid must be the same as that 292 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 293 * doesn't work. 294 */ 295 if (dep->de_Attributes & ATTR_DIRECTORY) { 296 fileid = cntobn(pmp, dep->de_StartCluster) * dirsperblk; 297 if (dep->de_StartCluster == MSDOSFSROOT) 298 fileid = 1; 299 } else { 300 fileid = cntobn(pmp, dep->de_dirclust) * dirsperblk; 301 if (dep->de_dirclust == MSDOSFSROOT) 302 fileid = roottobn(pmp, 0) * dirsperblk; 303 fileid += dep->de_diroffset / sizeof(struct direntry); 304 } 305 vap->va_fileid = fileid; 306 if ((dep->de_Attributes & ATTR_READONLY) == 0) 307 mode = S_IRWXU|S_IRWXG|S_IRWXO; 308 else 309 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 310 vap->va_mode = mode & pmp->pm_mask; 311 vap->va_uid = pmp->pm_uid; 312 vap->va_gid = pmp->pm_gid; 313 vap->va_nlink = 1; 314 vap->va_rdev = 0; 315 vap->va_size = dep->de_FileSize; 316 dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime); 317 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 318 dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime); 319 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, &vap->va_ctime); 320 } else { 321 vap->va_atime = vap->va_mtime; 322 vap->va_ctime = vap->va_mtime; 323 } 324 vap->va_flags = 0; 325 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) 326 vap->va_flags |= SF_ARCHIVED; 327 vap->va_gen = 0; 328 vap->va_blocksize = pmp->pm_bpcluster; 329 vap->va_bytes = 330 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 331 vap->va_type = ap->a_vp->v_type; 332 vap->va_filerev = dep->de_modrev; 333 return (0); 334 } 335 336 static int 337 msdosfs_setattr(ap) 338 struct vop_setattr_args /* { 339 struct vnode *a_vp; 340 struct vattr *a_vap; 341 struct ucred *a_cred; 342 struct thread *a_td; 343 } */ *ap; 344 { 345 struct vnode *vp = ap->a_vp; 346 struct denode *dep = VTODE(ap->a_vp); 347 struct msdosfsmount *pmp = dep->de_pmp; 348 struct vattr *vap = ap->a_vap; 349 struct ucred *cred = ap->a_cred; 350 int error = 0; 351 352 #ifdef MSDOSFS_DEBUG 353 printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n", 354 ap->a_vp, vap, cred, ap->a_td); 355 #endif 356 357 /* 358 * Check for unsettable attributes. 359 */ 360 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 361 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 362 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 363 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 364 #ifdef MSDOSFS_DEBUG 365 printf("msdosfs_setattr(): returning EINVAL\n"); 366 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", 367 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 368 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n", 369 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 370 printf(" va_uid %x, va_gid %x\n", 371 vap->va_uid, vap->va_gid); 372 #endif 373 return (EINVAL); 374 } 375 if (vap->va_flags != VNOVAL) { 376 if (vp->v_mount->mnt_flag & MNT_RDONLY) 377 return (EROFS); 378 if (cred->cr_uid != pmp->pm_uid && 379 (error = suser_cred(cred, PRISON_ROOT))) 380 return (error); 381 /* 382 * We are very inconsistent about handling unsupported 383 * attributes. We ignored the access time and the 384 * read and execute bits. We were strict for the other 385 * attributes. 386 * 387 * Here we are strict, stricter than ufs in not allowing 388 * users to attempt to set SF_SETTABLE bits or anyone to 389 * set unsupported bits. However, we ignore attempts to 390 * set ATTR_ARCHIVE for directories `cp -pr' from a more 391 * sensible filesystem attempts it a lot. 392 */ 393 if (suser_cred(cred, PRISON_ROOT)) { 394 if (vap->va_flags & SF_SETTABLE) 395 return EPERM; 396 } 397 if (vap->va_flags & ~SF_ARCHIVED) 398 return EOPNOTSUPP; 399 if (vap->va_flags & SF_ARCHIVED) 400 dep->de_Attributes &= ~ATTR_ARCHIVE; 401 else if (!(dep->de_Attributes & ATTR_DIRECTORY)) 402 dep->de_Attributes |= ATTR_ARCHIVE; 403 dep->de_flag |= DE_MODIFIED; 404 } 405 406 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 407 uid_t uid; 408 gid_t gid; 409 410 if (vp->v_mount->mnt_flag & MNT_RDONLY) 411 return (EROFS); 412 uid = vap->va_uid; 413 if (uid == (uid_t)VNOVAL) 414 uid = pmp->pm_uid; 415 gid = vap->va_gid; 416 if (gid == (gid_t)VNOVAL) 417 gid = pmp->pm_gid; 418 if ((cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 419 (gid != pmp->pm_gid && !groupmember(gid, cred))) && 420 (error = suser_cred(cred, PRISON_ROOT))) 421 return error; 422 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 423 return EINVAL; 424 } 425 426 if (vap->va_size != VNOVAL) { 427 /* 428 * Disallow write attempts on read-only filesystems; 429 * unless the file is a socket, fifo, or a block or 430 * character device resident on the filesystem. 431 */ 432 switch (vp->v_type) { 433 case VDIR: 434 return (EISDIR); 435 /* NOT REACHED */ 436 case VLNK: 437 case VREG: 438 if (vp->v_mount->mnt_flag & MNT_RDONLY) 439 return (EROFS); 440 break; 441 default: 442 break; 443 } 444 error = detrunc(dep, vap->va_size, 0, cred, ap->a_td); 445 if (error) 446 return error; 447 } 448 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 449 if (vp->v_mount->mnt_flag & MNT_RDONLY) 450 return (EROFS); 451 if (cred->cr_uid != pmp->pm_uid && 452 (error = suser_cred(cred, PRISON_ROOT)) && 453 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 454 (error = VOP_ACCESS(ap->a_vp, VWRITE, cred, ap->a_td)))) 455 return (error); 456 if (vp->v_type != VDIR) { 457 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 458 vap->va_atime.tv_sec != VNOVAL) { 459 dep->de_flag &= ~DE_ACCESS; 460 unix2dostime(&vap->va_atime, &dep->de_ADate, 461 NULL, NULL); 462 } 463 if (vap->va_mtime.tv_sec != VNOVAL) { 464 dep->de_flag &= ~DE_UPDATE; 465 unix2dostime(&vap->va_mtime, &dep->de_MDate, 466 &dep->de_MTime, NULL); 467 } 468 dep->de_Attributes |= ATTR_ARCHIVE; 469 dep->de_flag |= DE_MODIFIED; 470 } 471 } 472 /* 473 * DOS files only have the ability to have their writability 474 * attribute set, so we use the owner write bit to set the readonly 475 * attribute. 476 */ 477 if (vap->va_mode != (mode_t)VNOVAL) { 478 if (vp->v_mount->mnt_flag & MNT_RDONLY) 479 return (EROFS); 480 if (cred->cr_uid != pmp->pm_uid && 481 (error = suser_cred(cred, PRISON_ROOT))) 482 return (error); 483 if (vp->v_type != VDIR) { 484 /* We ignore the read and execute bits. */ 485 if (vap->va_mode & VWRITE) 486 dep->de_Attributes &= ~ATTR_READONLY; 487 else 488 dep->de_Attributes |= ATTR_READONLY; 489 dep->de_Attributes |= ATTR_ARCHIVE; 490 dep->de_flag |= DE_MODIFIED; 491 } 492 } 493 return (deupdat(dep, 1)); 494 } 495 496 static int 497 msdosfs_read(ap) 498 struct vop_read_args /* { 499 struct vnode *a_vp; 500 struct uio *a_uio; 501 int a_ioflag; 502 struct ucred *a_cred; 503 } */ *ap; 504 { 505 int error = 0; 506 int blsize; 507 int isadir; 508 int orig_resid; 509 u_int n; 510 u_long diff; 511 u_long on; 512 daddr_t lbn; 513 daddr_t rablock; 514 int rasize; 515 int seqcount; 516 struct buf *bp; 517 struct vnode *vp = ap->a_vp; 518 struct denode *dep = VTODE(vp); 519 struct msdosfsmount *pmp = dep->de_pmp; 520 struct uio *uio = ap->a_uio; 521 522 if (uio->uio_offset < 0) 523 return (EINVAL); 524 525 if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX) 526 return (0); 527 /* 528 * If they didn't ask for any data, then we are done. 529 */ 530 orig_resid = uio->uio_resid; 531 if (orig_resid <= 0) 532 return (0); 533 534 seqcount = ap->a_ioflag >> 16; 535 536 isadir = dep->de_Attributes & ATTR_DIRECTORY; 537 do { 538 if (uio->uio_offset >= dep->de_FileSize) 539 break; 540 lbn = de_cluster(pmp, uio->uio_offset); 541 /* 542 * If we are operating on a directory file then be sure to 543 * do i/o with the vnode for the filesystem instead of the 544 * vnode for the directory. 545 */ 546 if (isadir) { 547 /* convert cluster # to block # */ 548 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 549 if (error == E2BIG) { 550 error = EINVAL; 551 break; 552 } else if (error) 553 break; 554 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 555 } else { 556 blsize = pmp->pm_bpcluster; 557 rablock = lbn + 1; 558 if (seqcount > 1 && 559 de_cn2off(pmp, rablock) < dep->de_FileSize) { 560 rasize = pmp->pm_bpcluster; 561 error = breadn(vp, lbn, blsize, 562 &rablock, &rasize, 1, NOCRED, &bp); 563 } else { 564 error = bread(vp, lbn, blsize, NOCRED, &bp); 565 } 566 } 567 if (error) { 568 brelse(bp); 569 break; 570 } 571 on = uio->uio_offset & pmp->pm_crbomask; 572 diff = pmp->pm_bpcluster - on; 573 n = diff > uio->uio_resid ? uio->uio_resid : diff; 574 diff = dep->de_FileSize - uio->uio_offset; 575 if (diff < n) 576 n = diff; 577 diff = blsize - bp->b_resid; 578 if (diff < n) 579 n = diff; 580 error = uiomove(bp->b_data + on, (int) n, uio); 581 brelse(bp); 582 } while (error == 0 && uio->uio_resid > 0 && n != 0); 583 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 584 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 585 dep->de_flag |= DE_ACCESS; 586 return (error); 587 } 588 589 /* 590 * Write data to a file or directory. 591 */ 592 static int 593 msdosfs_write(ap) 594 struct vop_write_args /* { 595 struct vnode *a_vp; 596 struct uio *a_uio; 597 int a_ioflag; 598 struct ucred *a_cred; 599 } */ *ap; 600 { 601 int n; 602 int croffset; 603 int resid; 604 u_long osize; 605 int error = 0; 606 u_long count; 607 daddr_t bn, lastcn; 608 struct buf *bp; 609 int ioflag = ap->a_ioflag; 610 struct uio *uio = ap->a_uio; 611 struct thread *td = uio->uio_td; 612 struct vnode *vp = ap->a_vp; 613 struct vnode *thisvp; 614 struct denode *dep = VTODE(vp); 615 struct msdosfsmount *pmp = dep->de_pmp; 616 struct ucred *cred = ap->a_cred; 617 618 #ifdef MSDOSFS_DEBUG 619 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 620 vp, uio, ioflag, cred); 621 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 622 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 623 #endif 624 625 switch (vp->v_type) { 626 case VREG: 627 if (ioflag & IO_APPEND) 628 uio->uio_offset = dep->de_FileSize; 629 thisvp = vp; 630 break; 631 case VDIR: 632 return EISDIR; 633 default: 634 panic("msdosfs_write(): bad file type"); 635 } 636 637 if (uio->uio_offset < 0) 638 return (EFBIG); 639 640 if (uio->uio_resid == 0) 641 return (0); 642 643 /* 644 * If they've exceeded their filesize limit, tell them about it. 645 */ 646 if (td && 647 ((uoff_t)uio->uio_offset + uio->uio_resid > 648 td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur)) { 649 PROC_LOCK(td->td_proc); 650 psignal(td->td_proc, SIGXFSZ); 651 PROC_UNLOCK(td->td_proc); 652 return (EFBIG); 653 } 654 655 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) 656 return (EFBIG); 657 658 /* 659 * If the offset we are starting the write at is beyond the end of 660 * the file, then they've done a seek. Unix filesystems allow 661 * files with holes in them, DOS doesn't so we must fill the hole 662 * with zeroed blocks. 663 */ 664 if (uio->uio_offset > dep->de_FileSize) { 665 error = deextend(dep, uio->uio_offset, cred); 666 if (error) 667 return (error); 668 } 669 670 /* 671 * Remember some values in case the write fails. 672 */ 673 resid = uio->uio_resid; 674 osize = dep->de_FileSize; 675 676 /* 677 * If we write beyond the end of the file, extend it to its ultimate 678 * size ahead of the time to hopefully get a contiguous area. 679 */ 680 if (uio->uio_offset + resid > osize) { 681 count = de_clcount(pmp, uio->uio_offset + resid) - 682 de_clcount(pmp, osize); 683 error = extendfile(dep, count, NULL, NULL, 0); 684 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 685 goto errexit; 686 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 687 } else 688 lastcn = de_clcount(pmp, osize) - 1; 689 690 do { 691 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 692 error = ENOSPC; 693 break; 694 } 695 696 croffset = uio->uio_offset & pmp->pm_crbomask; 697 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 698 if (uio->uio_offset + n > dep->de_FileSize) { 699 dep->de_FileSize = uio->uio_offset + n; 700 /* The object size needs to be set before buffer is allocated */ 701 vnode_pager_setsize(vp, dep->de_FileSize); 702 } 703 704 bn = de_cluster(pmp, uio->uio_offset); 705 if ((uio->uio_offset & pmp->pm_crbomask) == 0 706 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 707 > de_cluster(pmp, uio->uio_offset) 708 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 709 /* 710 * If either the whole cluster gets written, 711 * or we write the cluster from its start beyond EOF, 712 * then no need to read data from disk. 713 */ 714 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0); 715 clrbuf(bp); 716 /* 717 * Do the bmap now, since pcbmap needs buffers 718 * for the fat table. (see msdosfs_strategy) 719 */ 720 if (bp->b_blkno == bp->b_lblkno) { 721 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 722 if (error) 723 bp->b_blkno = -1; 724 else 725 bp->b_blkno = bn; 726 } 727 if (bp->b_blkno == -1) { 728 brelse(bp); 729 if (!error) 730 error = EIO; /* XXX */ 731 break; 732 } 733 } else { 734 /* 735 * The block we need to write into exists, so read it in. 736 */ 737 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 738 if (error) { 739 brelse(bp); 740 break; 741 } 742 } 743 744 /* 745 * Should these vnode_pager_* functions be done on dir 746 * files? 747 */ 748 749 /* 750 * Copy the data from user space into the buf header. 751 */ 752 error = uiomove(bp->b_data + croffset, n, uio); 753 if (error) { 754 brelse(bp); 755 break; 756 } 757 758 /* 759 * If they want this synchronous then write it and wait for 760 * it. Otherwise, if on a cluster boundary write it 761 * asynchronously so we can move on to the next block 762 * without delay. Otherwise do a delayed write because we 763 * may want to write somemore into the block later. 764 */ 765 if (ioflag & IO_SYNC) 766 (void) bwrite(bp); 767 else if (n + croffset == pmp->pm_bpcluster) 768 bawrite(bp); 769 else 770 bdwrite(bp); 771 dep->de_flag |= DE_UPDATE; 772 } while (error == 0 && uio->uio_resid > 0); 773 774 /* 775 * If the write failed and they want us to, truncate the file back 776 * to the size it was before the write was attempted. 777 */ 778 errexit: 779 if (error) { 780 if (ioflag & IO_UNIT) { 781 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL); 782 uio->uio_offset -= resid - uio->uio_resid; 783 uio->uio_resid = resid; 784 } else { 785 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL); 786 if (uio->uio_resid != resid) 787 error = 0; 788 } 789 } else if (ioflag & IO_SYNC) 790 error = deupdat(dep, 1); 791 return (error); 792 } 793 794 /* 795 * Flush the blocks of a file to disk. 796 * 797 * This function is worthless for vnodes that represent directories. Maybe we 798 * could just do a sync if they try an fsync on a directory file. 799 */ 800 static int 801 msdosfs_fsync(ap) 802 struct vop_fsync_args /* { 803 struct vnode *a_vp; 804 struct ucred *a_cred; 805 int a_waitfor; 806 struct thread *a_td; 807 } */ *ap; 808 { 809 struct vnode *vp = ap->a_vp; 810 int s; 811 struct buf *bp, *nbp; 812 813 /* 814 * Flush all dirty buffers associated with a vnode. 815 */ 816 loop: 817 s = splbio(); 818 VI_LOCK(vp); 819 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 820 nbp = TAILQ_NEXT(bp, b_vnbufs); 821 VI_UNLOCK(vp); 822 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { 823 VI_LOCK(vp); 824 continue; 825 } 826 if ((bp->b_flags & B_DELWRI) == 0) 827 panic("msdosfs_fsync: not dirty"); 828 bremfree(bp); 829 splx(s); 830 /* XXX Could do bawrite */ 831 (void) bwrite(bp); 832 goto loop; 833 } 834 while (vp->v_numoutput) { 835 vp->v_iflag |= VI_BWAIT; 836 (void) msleep((caddr_t)&vp->v_numoutput, VI_MTX(vp), 837 PRIBIO + 1, "msdosfsn", 0); 838 } 839 #ifdef DIAGNOSTIC 840 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) { 841 vprint("msdosfs_fsync: dirty", vp); 842 goto loop; 843 } 844 #endif 845 VI_UNLOCK(vp); 846 splx(s); 847 return (deupdat(VTODE(vp), ap->a_waitfor == MNT_WAIT)); 848 } 849 850 static int 851 msdosfs_remove(ap) 852 struct vop_remove_args /* { 853 struct vnode *a_dvp; 854 struct vnode *a_vp; 855 struct componentname *a_cnp; 856 } */ *ap; 857 { 858 struct denode *dep = VTODE(ap->a_vp); 859 struct denode *ddep = VTODE(ap->a_dvp); 860 int error; 861 862 if (ap->a_vp->v_type == VDIR) 863 error = EPERM; 864 else 865 error = removede(ddep, dep); 866 #ifdef MSDOSFS_DEBUG 867 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 868 #endif 869 return (error); 870 } 871 872 /* 873 * DOS filesystems don't know what links are. 874 */ 875 static int 876 msdosfs_link(ap) 877 struct vop_link_args /* { 878 struct vnode *a_tdvp; 879 struct vnode *a_vp; 880 struct componentname *a_cnp; 881 } */ *ap; 882 { 883 return (EOPNOTSUPP); 884 } 885 886 /* 887 * Renames on files require moving the denode to a new hash queue since the 888 * denode's location is used to compute which hash queue to put the file 889 * in. Unless it is a rename in place. For example "mv a b". 890 * 891 * What follows is the basic algorithm: 892 * 893 * if (file move) { 894 * if (dest file exists) { 895 * remove dest file 896 * } 897 * if (dest and src in same directory) { 898 * rewrite name in existing directory slot 899 * } else { 900 * write new entry in dest directory 901 * update offset and dirclust in denode 902 * move denode to new hash chain 903 * clear old directory entry 904 * } 905 * } else { 906 * directory move 907 * if (dest directory exists) { 908 * if (dest is not empty) { 909 * return ENOTEMPTY 910 * } 911 * remove dest directory 912 * } 913 * if (dest and src in same directory) { 914 * rewrite name in existing entry 915 * } else { 916 * be sure dest is not a child of src directory 917 * write entry in dest directory 918 * update "." and ".." in moved directory 919 * clear old directory entry for moved directory 920 * } 921 * } 922 * 923 * On entry: 924 * source's parent directory is unlocked 925 * source file or directory is unlocked 926 * destination's parent directory is locked 927 * destination file or directory is locked if it exists 928 * 929 * On exit: 930 * all denodes should be released 931 */ 932 static int 933 msdosfs_rename(ap) 934 struct vop_rename_args /* { 935 struct vnode *a_fdvp; 936 struct vnode *a_fvp; 937 struct componentname *a_fcnp; 938 struct vnode *a_tdvp; 939 struct vnode *a_tvp; 940 struct componentname *a_tcnp; 941 } */ *ap; 942 { 943 struct vnode *tdvp = ap->a_tdvp; 944 struct vnode *fvp = ap->a_fvp; 945 struct vnode *fdvp = ap->a_fdvp; 946 struct vnode *tvp = ap->a_tvp; 947 struct componentname *tcnp = ap->a_tcnp; 948 struct componentname *fcnp = ap->a_fcnp; 949 struct thread *td = fcnp->cn_thread; 950 struct denode *ip, *xp, *dp, *zp; 951 u_char toname[11], oldname[11]; 952 u_long from_diroffset, to_diroffset; 953 u_char to_count; 954 int doingdirectory = 0, newparent = 0; 955 int error; 956 u_long cn; 957 daddr_t bn; 958 struct denode *fddep; /* from file's parent directory */ 959 struct denode *fdep; /* from file or directory */ 960 struct denode *tddep; /* to file's parent directory */ 961 struct denode *tdep; /* to file or directory */ 962 struct msdosfsmount *pmp; 963 struct direntry *dotdotp; 964 struct buf *bp; 965 966 fddep = VTODE(ap->a_fdvp); 967 fdep = VTODE(ap->a_fvp); 968 tddep = VTODE(ap->a_tdvp); 969 tdep = tvp ? VTODE(tvp) : NULL; 970 pmp = fddep->de_pmp; 971 972 pmp = VFSTOMSDOSFS(fdvp->v_mount); 973 974 #ifdef DIAGNOSTIC 975 if ((tcnp->cn_flags & HASBUF) == 0 || 976 (fcnp->cn_flags & HASBUF) == 0) 977 panic("msdosfs_rename: no name"); 978 #endif 979 /* 980 * Check for cross-device rename. 981 */ 982 if ((fvp->v_mount != tdvp->v_mount) || 983 (tvp && (fvp->v_mount != tvp->v_mount))) { 984 error = EXDEV; 985 abortit: 986 if (tdvp == tvp) 987 vrele(tdvp); 988 else 989 vput(tdvp); 990 if (tvp) 991 vput(tvp); 992 vrele(fdvp); 993 vrele(fvp); 994 return (error); 995 } 996 997 /* 998 * If source and dest are the same, do nothing. 999 */ 1000 if (tvp == fvp) { 1001 error = 0; 1002 goto abortit; 1003 } 1004 1005 error = vn_lock(fvp, LK_EXCLUSIVE, td); 1006 if (error) 1007 goto abortit; 1008 dp = VTODE(fdvp); 1009 ip = VTODE(fvp); 1010 1011 /* 1012 * Be sure we are not renaming ".", "..", or an alias of ".". This 1013 * leads to a crippled directory tree. It's pretty tough to do a 1014 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1015 * doesn't work if the ".." entry is missing. 1016 */ 1017 if (ip->de_Attributes & ATTR_DIRECTORY) { 1018 /* 1019 * Avoid ".", "..", and aliases of "." for obvious reasons. 1020 */ 1021 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1022 dp == ip || 1023 (fcnp->cn_flags & ISDOTDOT) || 1024 (tcnp->cn_flags & ISDOTDOT) || 1025 (ip->de_flag & DE_RENAME)) { 1026 VOP_UNLOCK(fvp, 0, td); 1027 error = EINVAL; 1028 goto abortit; 1029 } 1030 ip->de_flag |= DE_RENAME; 1031 doingdirectory++; 1032 } 1033 1034 /* 1035 * When the target exists, both the directory 1036 * and target vnodes are returned locked. 1037 */ 1038 dp = VTODE(tdvp); 1039 xp = tvp ? VTODE(tvp) : NULL; 1040 /* 1041 * Remember direntry place to use for destination 1042 */ 1043 to_diroffset = dp->de_fndoffset; 1044 to_count = dp->de_fndcnt; 1045 1046 /* 1047 * If ".." must be changed (ie the directory gets a new 1048 * parent) then the source directory must not be in the 1049 * directory heirarchy above the target, as this would 1050 * orphan everything below the source directory. Also 1051 * the user must have write permission in the source so 1052 * as to be able to change "..". We must repeat the call 1053 * to namei, as the parent directory is unlocked by the 1054 * call to doscheckpath(). 1055 */ 1056 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1057 VOP_UNLOCK(fvp, 0, td); 1058 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1059 newparent = 1; 1060 if (doingdirectory && newparent) { 1061 if (error) /* write access check above */ 1062 goto bad; 1063 if (xp != NULL) 1064 vput(tvp); 1065 /* 1066 * doscheckpath() vput()'s dp, 1067 * so we have to do a relookup afterwards 1068 */ 1069 error = doscheckpath(ip, dp); 1070 if (error) 1071 goto out; 1072 if ((tcnp->cn_flags & SAVESTART) == 0) 1073 panic("msdosfs_rename: lost to startdir"); 1074 error = relookup(tdvp, &tvp, tcnp); 1075 if (error) 1076 goto out; 1077 dp = VTODE(tdvp); 1078 xp = tvp ? VTODE(tvp) : NULL; 1079 } 1080 1081 if (xp != NULL) { 1082 /* 1083 * Target must be empty if a directory and have no links 1084 * to it. Also, ensure source and target are compatible 1085 * (both directories, or both not directories). 1086 */ 1087 if (xp->de_Attributes & ATTR_DIRECTORY) { 1088 if (!dosdirempty(xp)) { 1089 error = ENOTEMPTY; 1090 goto bad; 1091 } 1092 if (!doingdirectory) { 1093 error = ENOTDIR; 1094 goto bad; 1095 } 1096 cache_purge(tdvp); 1097 } else if (doingdirectory) { 1098 error = EISDIR; 1099 goto bad; 1100 } 1101 error = removede(dp, xp); 1102 if (error) 1103 goto bad; 1104 vput(tvp); 1105 xp = NULL; 1106 } 1107 1108 /* 1109 * Convert the filename in tcnp into a dos filename. We copy this 1110 * into the denode and directory entry for the destination 1111 * file/directory. 1112 */ 1113 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1114 if (error) 1115 goto abortit; 1116 1117 /* 1118 * Since from wasn't locked at various places above, 1119 * have to do a relookup here. 1120 */ 1121 fcnp->cn_flags &= ~MODMASK; 1122 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1123 if ((fcnp->cn_flags & SAVESTART) == 0) 1124 panic("msdosfs_rename: lost from startdir"); 1125 if (!newparent) 1126 VOP_UNLOCK(tdvp, 0, td); 1127 if (relookup(fdvp, &fvp, fcnp) == 0) 1128 vrele(fdvp); 1129 if (fvp == NULL) { 1130 /* 1131 * From name has disappeared. 1132 */ 1133 if (doingdirectory) 1134 panic("rename: lost dir entry"); 1135 vrele(ap->a_fvp); 1136 if (newparent) 1137 VOP_UNLOCK(tdvp, 0, td); 1138 vrele(tdvp); 1139 return 0; 1140 } 1141 xp = VTODE(fvp); 1142 zp = VTODE(fdvp); 1143 from_diroffset = zp->de_fndoffset; 1144 1145 /* 1146 * Ensure that the directory entry still exists and has not 1147 * changed till now. If the source is a file the entry may 1148 * have been unlinked or renamed. In either case there is 1149 * no further work to be done. If the source is a directory 1150 * then it cannot have been rmdir'ed or renamed; this is 1151 * prohibited by the DE_RENAME flag. 1152 */ 1153 if (xp != ip) { 1154 if (doingdirectory) 1155 panic("rename: lost dir entry"); 1156 vrele(ap->a_fvp); 1157 VOP_UNLOCK(fvp, 0, td); 1158 if (newparent) 1159 VOP_UNLOCK(fdvp, 0, td); 1160 xp = NULL; 1161 } else { 1162 vrele(fvp); 1163 xp = NULL; 1164 1165 /* 1166 * First write a new entry in the destination 1167 * directory and mark the entry in the source directory 1168 * as deleted. Then move the denode to the correct hash 1169 * chain for its new location in the filesystem. And, if 1170 * we moved a directory, then update its .. entry to point 1171 * to the new parent directory. 1172 */ 1173 bcopy(ip->de_Name, oldname, 11); 1174 bcopy(toname, ip->de_Name, 11); /* update denode */ 1175 dp->de_fndoffset = to_diroffset; 1176 dp->de_fndcnt = to_count; 1177 error = createde(ip, dp, (struct denode **)0, tcnp); 1178 if (error) { 1179 bcopy(oldname, ip->de_Name, 11); 1180 if (newparent) 1181 VOP_UNLOCK(fdvp, 0, td); 1182 VOP_UNLOCK(fvp, 0, td); 1183 goto bad; 1184 } 1185 ip->de_refcnt++; 1186 zp->de_fndoffset = from_diroffset; 1187 error = removede(zp, ip); 1188 if (error) { 1189 /* XXX should really panic here, fs is corrupt */ 1190 if (newparent) 1191 VOP_UNLOCK(fdvp, 0, td); 1192 VOP_UNLOCK(fvp, 0, td); 1193 goto bad; 1194 } 1195 if (!doingdirectory) { 1196 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1197 &ip->de_dirclust, 0); 1198 if (error) { 1199 /* XXX should really panic here, fs is corrupt */ 1200 if (newparent) 1201 VOP_UNLOCK(fdvp, 0, td); 1202 VOP_UNLOCK(fvp, 0, td); 1203 goto bad; 1204 } 1205 if (ip->de_dirclust == MSDOSFSROOT) 1206 ip->de_diroffset = to_diroffset; 1207 else 1208 ip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1209 } 1210 reinsert(ip); 1211 if (newparent) 1212 VOP_UNLOCK(fdvp, 0, td); 1213 } 1214 1215 /* 1216 * If we moved a directory to a new parent directory, then we must 1217 * fixup the ".." entry in the moved directory. 1218 */ 1219 if (doingdirectory && newparent) { 1220 cn = ip->de_StartCluster; 1221 if (cn == MSDOSFSROOT) { 1222 /* this should never happen */ 1223 panic("msdosfs_rename(): updating .. in root directory?"); 1224 } else 1225 bn = cntobn(pmp, cn); 1226 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1227 NOCRED, &bp); 1228 if (error) { 1229 /* XXX should really panic here, fs is corrupt */ 1230 brelse(bp); 1231 VOP_UNLOCK(fvp, 0, td); 1232 goto bad; 1233 } 1234 dotdotp = (struct direntry *)bp->b_data + 1; 1235 putushort(dotdotp->deStartCluster, dp->de_StartCluster); 1236 if (FAT32(pmp)) 1237 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16); 1238 error = bwrite(bp); 1239 if (error) { 1240 /* XXX should really panic here, fs is corrupt */ 1241 VOP_UNLOCK(fvp, 0, td); 1242 goto bad; 1243 } 1244 } 1245 1246 VOP_UNLOCK(fvp, 0, td); 1247 bad: 1248 if (xp) 1249 vput(tvp); 1250 vput(tdvp); 1251 out: 1252 ip->de_flag &= ~DE_RENAME; 1253 vrele(fdvp); 1254 vrele(fvp); 1255 return (error); 1256 1257 } 1258 1259 static struct { 1260 struct direntry dot; 1261 struct direntry dotdot; 1262 } dosdirtemplate = { 1263 { ". ", " ", /* the . entry */ 1264 ATTR_DIRECTORY, /* file attribute */ 1265 0, /* reserved */ 1266 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1267 { 0, 0 }, /* access date */ 1268 { 0, 0 }, /* high bits of start cluster */ 1269 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1270 { 0, 0 }, /* startcluster */ 1271 { 0, 0, 0, 0 } /* filesize */ 1272 }, 1273 { ".. ", " ", /* the .. entry */ 1274 ATTR_DIRECTORY, /* file attribute */ 1275 0, /* reserved */ 1276 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1277 { 0, 0 }, /* access date */ 1278 { 0, 0 }, /* high bits of start cluster */ 1279 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1280 { 0, 0 }, /* startcluster */ 1281 { 0, 0, 0, 0 } /* filesize */ 1282 } 1283 }; 1284 1285 static int 1286 msdosfs_mkdir(ap) 1287 struct vop_mkdir_args /* { 1288 struct vnode *a_dvp; 1289 struvt vnode **a_vpp; 1290 struvt componentname *a_cnp; 1291 struct vattr *a_vap; 1292 } */ *ap; 1293 { 1294 struct componentname *cnp = ap->a_cnp; 1295 struct denode *dep; 1296 struct denode *pdep = VTODE(ap->a_dvp); 1297 struct direntry *denp; 1298 struct msdosfsmount *pmp = pdep->de_pmp; 1299 struct buf *bp; 1300 u_long newcluster, pcl; 1301 int bn; 1302 int error; 1303 struct denode ndirent; 1304 struct timespec ts; 1305 1306 /* 1307 * If this is the root directory and there is no space left we 1308 * can't do anything. This is because the root directory can not 1309 * change size. 1310 */ 1311 if (pdep->de_StartCluster == MSDOSFSROOT 1312 && pdep->de_fndoffset >= pdep->de_FileSize) { 1313 error = ENOSPC; 1314 goto bad2; 1315 } 1316 1317 /* 1318 * Allocate a cluster to hold the about to be created directory. 1319 */ 1320 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1321 if (error) 1322 goto bad2; 1323 1324 bzero(&ndirent, sizeof(ndirent)); 1325 ndirent.de_pmp = pmp; 1326 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1327 getnanotime(&ts); 1328 DETIMES(&ndirent, &ts, &ts, &ts); 1329 1330 /* 1331 * Now fill the cluster with the "." and ".." entries. And write 1332 * the cluster to disk. This way it is there for the parent 1333 * directory to be pointing at if there were a crash. 1334 */ 1335 bn = cntobn(pmp, newcluster); 1336 /* always succeeds */ 1337 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0); 1338 bzero(bp->b_data, pmp->pm_bpcluster); 1339 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1340 denp = (struct direntry *)bp->b_data; 1341 putushort(denp[0].deStartCluster, newcluster); 1342 putushort(denp[0].deCDate, ndirent.de_CDate); 1343 putushort(denp[0].deCTime, ndirent.de_CTime); 1344 denp[0].deCHundredth = ndirent.de_CHun; 1345 putushort(denp[0].deADate, ndirent.de_ADate); 1346 putushort(denp[0].deMDate, ndirent.de_MDate); 1347 putushort(denp[0].deMTime, ndirent.de_MTime); 1348 pcl = pdep->de_StartCluster; 1349 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1350 pcl = 0; 1351 putushort(denp[1].deStartCluster, pcl); 1352 putushort(denp[1].deCDate, ndirent.de_CDate); 1353 putushort(denp[1].deCTime, ndirent.de_CTime); 1354 denp[1].deCHundredth = ndirent.de_CHun; 1355 putushort(denp[1].deADate, ndirent.de_ADate); 1356 putushort(denp[1].deMDate, ndirent.de_MDate); 1357 putushort(denp[1].deMTime, ndirent.de_MTime); 1358 if (FAT32(pmp)) { 1359 putushort(denp[0].deHighClust, newcluster >> 16); 1360 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 1361 } 1362 1363 error = bwrite(bp); 1364 if (error) 1365 goto bad; 1366 1367 /* 1368 * Now build up a directory entry pointing to the newly allocated 1369 * cluster. This will be written to an empty slot in the parent 1370 * directory. 1371 */ 1372 #ifdef DIAGNOSTIC 1373 if ((cnp->cn_flags & HASBUF) == 0) 1374 panic("msdosfs_mkdir: no name"); 1375 #endif 1376 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1377 if (error) 1378 goto bad; 1379 1380 ndirent.de_Attributes = ATTR_DIRECTORY; 1381 ndirent.de_LowerCase = 0; 1382 ndirent.de_StartCluster = newcluster; 1383 ndirent.de_FileSize = 0; 1384 ndirent.de_dev = pdep->de_dev; 1385 ndirent.de_devvp = pdep->de_devvp; 1386 error = createde(&ndirent, pdep, &dep, cnp); 1387 if (error) 1388 goto bad; 1389 *ap->a_vpp = DETOV(dep); 1390 return (0); 1391 1392 bad: 1393 clusterfree(pmp, newcluster, NULL); 1394 bad2: 1395 return (error); 1396 } 1397 1398 static int 1399 msdosfs_rmdir(ap) 1400 struct vop_rmdir_args /* { 1401 struct vnode *a_dvp; 1402 struct vnode *a_vp; 1403 struct componentname *a_cnp; 1404 } */ *ap; 1405 { 1406 register struct vnode *vp = ap->a_vp; 1407 register struct vnode *dvp = ap->a_dvp; 1408 register struct componentname *cnp = ap->a_cnp; 1409 register struct denode *ip, *dp; 1410 struct thread *td = cnp->cn_thread; 1411 int error; 1412 1413 ip = VTODE(vp); 1414 dp = VTODE(dvp); 1415 1416 /* 1417 * Verify the directory is empty (and valid). 1418 * (Rmdir ".." won't be valid since 1419 * ".." will contain a reference to 1420 * the current directory and thus be 1421 * non-empty.) 1422 */ 1423 error = 0; 1424 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1425 error = ENOTEMPTY; 1426 goto out; 1427 } 1428 /* 1429 * Delete the entry from the directory. For dos filesystems this 1430 * gets rid of the directory entry on disk, the in memory copy 1431 * still exists but the de_refcnt is <= 0. This prevents it from 1432 * being found by deget(). When the vput() on dep is done we give 1433 * up access and eventually msdosfs_reclaim() will be called which 1434 * will remove it from the denode cache. 1435 */ 1436 error = removede(dp, ip); 1437 if (error) 1438 goto out; 1439 /* 1440 * This is where we decrement the link count in the parent 1441 * directory. Since dos filesystems don't do this we just purge 1442 * the name cache. 1443 */ 1444 cache_purge(dvp); 1445 VOP_UNLOCK(dvp, 0, td); 1446 /* 1447 * Truncate the directory that is being deleted. 1448 */ 1449 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, td); 1450 cache_purge(vp); 1451 1452 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 1453 out: 1454 return (error); 1455 } 1456 1457 /* 1458 * DOS filesystems don't know what symlinks are. 1459 */ 1460 static int 1461 msdosfs_symlink(ap) 1462 struct vop_symlink_args /* { 1463 struct vnode *a_dvp; 1464 struct vnode **a_vpp; 1465 struct componentname *a_cnp; 1466 struct vattr *a_vap; 1467 char *a_target; 1468 } */ *ap; 1469 { 1470 return (EOPNOTSUPP); 1471 } 1472 1473 static int 1474 msdosfs_readdir(ap) 1475 struct vop_readdir_args /* { 1476 struct vnode *a_vp; 1477 struct uio *a_uio; 1478 struct ucred *a_cred; 1479 int *a_eofflag; 1480 int *a_ncookies; 1481 u_long **a_cookies; 1482 } */ *ap; 1483 { 1484 int error = 0; 1485 int diff; 1486 long n; 1487 int blsize; 1488 long on; 1489 u_long cn; 1490 u_long fileno; 1491 u_long dirsperblk; 1492 long bias = 0; 1493 daddr_t bn, lbn; 1494 struct buf *bp; 1495 struct denode *dep = VTODE(ap->a_vp); 1496 struct msdosfsmount *pmp = dep->de_pmp; 1497 struct direntry *dentp; 1498 struct dirent dirbuf; 1499 struct uio *uio = ap->a_uio; 1500 u_long *cookies = NULL; 1501 int ncookies = 0; 1502 off_t offset, off; 1503 int chksum = -1; 1504 1505 #ifdef MSDOSFS_DEBUG 1506 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1507 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1508 #endif 1509 1510 /* 1511 * msdosfs_readdir() won't operate properly on regular files since 1512 * it does i/o only with the the filesystem vnode, and hence can 1513 * retrieve the wrong block from the buffer cache for a plain file. 1514 * So, fail attempts to readdir() on a plain file. 1515 */ 1516 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1517 return (ENOTDIR); 1518 1519 /* 1520 * To be safe, initialize dirbuf 1521 */ 1522 bzero(dirbuf.d_name, sizeof(dirbuf.d_name)); 1523 1524 /* 1525 * If the user buffer is smaller than the size of one dos directory 1526 * entry or the file offset is not a multiple of the size of a 1527 * directory entry, then we fail the read. 1528 */ 1529 off = offset = uio->uio_offset; 1530 if (uio->uio_resid < sizeof(struct direntry) || 1531 (offset & (sizeof(struct direntry) - 1))) 1532 return (EINVAL); 1533 1534 if (ap->a_ncookies) { 1535 ncookies = uio->uio_resid / 16; 1536 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP, 1537 M_WAITOK); 1538 *ap->a_cookies = cookies; 1539 *ap->a_ncookies = ncookies; 1540 } 1541 1542 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1543 1544 /* 1545 * If they are reading from the root directory then, we simulate 1546 * the . and .. entries since these don't exist in the root 1547 * directory. We also set the offset bias to make up for having to 1548 * simulate these entries. By this I mean that at file offset 64 we 1549 * read the first entry in the root directory that lives on disk. 1550 */ 1551 if (dep->de_StartCluster == MSDOSFSROOT 1552 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1553 #if 0 1554 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1555 offset); 1556 #endif 1557 bias = 2 * sizeof(struct direntry); 1558 if (offset < bias) { 1559 for (n = (int)offset / sizeof(struct direntry); 1560 n < 2; n++) { 1561 if (FAT32(pmp)) 1562 dirbuf.d_fileno = cntobn(pmp, 1563 pmp->pm_rootdirblk) 1564 * dirsperblk; 1565 else 1566 dirbuf.d_fileno = 1; 1567 dirbuf.d_type = DT_DIR; 1568 switch (n) { 1569 case 0: 1570 dirbuf.d_namlen = 1; 1571 strcpy(dirbuf.d_name, "."); 1572 break; 1573 case 1: 1574 dirbuf.d_namlen = 2; 1575 strcpy(dirbuf.d_name, ".."); 1576 break; 1577 } 1578 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1579 if (uio->uio_resid < dirbuf.d_reclen) 1580 goto out; 1581 error = uiomove((caddr_t) &dirbuf, 1582 dirbuf.d_reclen, uio); 1583 if (error) 1584 goto out; 1585 offset += sizeof(struct direntry); 1586 off = offset; 1587 if (cookies) { 1588 *cookies++ = offset; 1589 if (--ncookies <= 0) 1590 goto out; 1591 } 1592 } 1593 } 1594 } 1595 1596 off = offset; 1597 while (uio->uio_resid > 0) { 1598 lbn = de_cluster(pmp, offset - bias); 1599 on = (offset - bias) & pmp->pm_crbomask; 1600 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1601 diff = dep->de_FileSize - (offset - bias); 1602 if (diff <= 0) 1603 break; 1604 n = min(n, diff); 1605 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1606 if (error) 1607 break; 1608 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1609 if (error) { 1610 brelse(bp); 1611 return (error); 1612 } 1613 n = min(n, blsize - bp->b_resid); 1614 1615 /* 1616 * Convert from dos directory entries to fs-independent 1617 * directory entries. 1618 */ 1619 for (dentp = (struct direntry *)(bp->b_data + on); 1620 (char *)dentp < bp->b_data + on + n; 1621 dentp++, offset += sizeof(struct direntry)) { 1622 #if 0 1623 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1624 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1625 #endif 1626 /* 1627 * If this is an unused entry, we can stop. 1628 */ 1629 if (dentp->deName[0] == SLOT_EMPTY) { 1630 brelse(bp); 1631 goto out; 1632 } 1633 /* 1634 * Skip deleted entries. 1635 */ 1636 if (dentp->deName[0] == SLOT_DELETED) { 1637 chksum = -1; 1638 continue; 1639 } 1640 1641 /* 1642 * Handle Win95 long directory entries 1643 */ 1644 if (dentp->deAttributes == ATTR_WIN95) { 1645 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1646 continue; 1647 chksum = win2unixfn((struct winentry *)dentp, 1648 &dirbuf, chksum, 1649 pmp->pm_flags & MSDOSFSMNT_U2WTABLE, 1650 pmp->pm_u2w); 1651 continue; 1652 } 1653 1654 /* 1655 * Skip volume labels 1656 */ 1657 if (dentp->deAttributes & ATTR_VOLUME) { 1658 chksum = -1; 1659 continue; 1660 } 1661 /* 1662 * This computation of d_fileno must match 1663 * the computation of va_fileid in 1664 * msdosfs_getattr. 1665 */ 1666 if (dentp->deAttributes & ATTR_DIRECTORY) { 1667 fileno = getushort(dentp->deStartCluster); 1668 if (FAT32(pmp)) 1669 fileno |= getushort(dentp->deHighClust) << 16; 1670 /* if this is the root directory */ 1671 if (fileno == MSDOSFSROOT) 1672 if (FAT32(pmp)) 1673 fileno = cntobn(pmp, 1674 pmp->pm_rootdirblk) 1675 * dirsperblk; 1676 else 1677 fileno = 1; 1678 else 1679 fileno = cntobn(pmp, fileno) * dirsperblk; 1680 dirbuf.d_fileno = fileno; 1681 dirbuf.d_type = DT_DIR; 1682 } else { 1683 dirbuf.d_fileno = offset / sizeof(struct direntry); 1684 dirbuf.d_type = DT_REG; 1685 } 1686 if (chksum != winChksum(dentp->deName)) 1687 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1688 (u_char *)dirbuf.d_name, 1689 dentp->deLowerCase | 1690 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1691 (LCASE_BASE | LCASE_EXT) : 0), 1692 pmp->pm_flags & MSDOSFSMNT_U2WTABLE, 1693 pmp->pm_d2u, 1694 pmp->pm_flags & MSDOSFSMNT_ULTABLE, 1695 pmp->pm_ul); 1696 else 1697 dirbuf.d_name[dirbuf.d_namlen] = 0; 1698 chksum = -1; 1699 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1700 if (uio->uio_resid < dirbuf.d_reclen) { 1701 brelse(bp); 1702 goto out; 1703 } 1704 error = uiomove((caddr_t) &dirbuf, 1705 dirbuf.d_reclen, uio); 1706 if (error) { 1707 brelse(bp); 1708 goto out; 1709 } 1710 if (cookies) { 1711 *cookies++ = offset + sizeof(struct direntry); 1712 if (--ncookies <= 0) { 1713 brelse(bp); 1714 goto out; 1715 } 1716 } 1717 off = offset + sizeof(struct direntry); 1718 } 1719 brelse(bp); 1720 } 1721 out: 1722 /* Subtract unused cookies */ 1723 if (ap->a_ncookies) 1724 *ap->a_ncookies -= ncookies; 1725 1726 uio->uio_offset = off; 1727 1728 /* 1729 * Set the eofflag (NFS uses it) 1730 */ 1731 if (ap->a_eofflag) { 1732 if (dep->de_FileSize - (offset - bias) <= 0) 1733 *ap->a_eofflag = 1; 1734 else 1735 *ap->a_eofflag = 0; 1736 } 1737 return (error); 1738 } 1739 1740 /* 1741 * vp - address of vnode file the file 1742 * bn - which cluster we are interested in mapping to a filesystem block number. 1743 * vpp - returns the vnode for the block special file holding the filesystem 1744 * containing the file of interest 1745 * bnp - address of where to return the filesystem relative block number 1746 */ 1747 static int 1748 msdosfs_bmap(ap) 1749 struct vop_bmap_args /* { 1750 struct vnode *a_vp; 1751 daddr_t a_bn; 1752 struct vnode **a_vpp; 1753 daddr_t *a_bnp; 1754 int *a_runp; 1755 int *a_runb; 1756 } */ *ap; 1757 { 1758 struct denode *dep = VTODE(ap->a_vp); 1759 daddr_t blkno; 1760 int error; 1761 1762 if (ap->a_vpp != NULL) 1763 *ap->a_vpp = dep->de_devvp; 1764 if (ap->a_bnp == NULL) 1765 return (0); 1766 if (ap->a_runp) { 1767 /* 1768 * Sequential clusters should be counted here. 1769 */ 1770 *ap->a_runp = 0; 1771 } 1772 if (ap->a_runb) { 1773 *ap->a_runb = 0; 1774 } 1775 error = pcbmap(dep, ap->a_bn, &blkno, 0, 0); 1776 *ap->a_bnp = blkno; 1777 return (error); 1778 } 1779 1780 static int 1781 msdosfs_strategy(ap) 1782 struct vop_strategy_args /* { 1783 struct vnode *a_vp; 1784 struct buf *a_bp; 1785 } */ *ap; 1786 { 1787 struct buf *bp = ap->a_bp; 1788 struct denode *dep = VTODE(bp->b_vp); 1789 struct vnode *vp; 1790 int error = 0; 1791 daddr_t blkno; 1792 1793 if (bp->b_vp->v_type == VBLK || bp->b_vp->v_type == VCHR) 1794 panic("msdosfs_strategy: spec"); 1795 /* 1796 * If we don't already know the filesystem relative block number 1797 * then get it using pcbmap(). If pcbmap() returns the block 1798 * number as -1 then we've got a hole in the file. DOS filesystems 1799 * don't allow files with holes, so we shouldn't ever see this. 1800 */ 1801 if (bp->b_blkno == bp->b_lblkno) { 1802 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1803 bp->b_blkno = blkno; 1804 if (error) { 1805 bp->b_error = error; 1806 bp->b_ioflags |= BIO_ERROR; 1807 bufdone(bp); 1808 return (error); 1809 } 1810 if ((long)bp->b_blkno == -1) 1811 vfs_bio_clrbuf(bp); 1812 } 1813 if (bp->b_blkno == -1) { 1814 bufdone(bp); 1815 return (0); 1816 } 1817 /* 1818 * Read/write the block from/to the disk that contains the desired 1819 * file block. 1820 */ 1821 vp = dep->de_devvp; 1822 bp->b_dev = vp->v_rdev; 1823 VOP_STRATEGY(vp, bp); 1824 return (0); 1825 } 1826 1827 static int 1828 msdosfs_print(ap) 1829 struct vop_print_args /* { 1830 struct vnode *vp; 1831 } */ *ap; 1832 { 1833 struct denode *dep = VTODE(ap->a_vp); 1834 1835 printf("startcluster %lu, dircluster %lu, diroffset %lu, ", 1836 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1837 printf("on dev (%d, %d)\n", major(dep->de_dev), minor(dep->de_dev)); 1838 return (0); 1839 } 1840 1841 static int 1842 msdosfs_pathconf(ap) 1843 struct vop_pathconf_args /* { 1844 struct vnode *a_vp; 1845 int a_name; 1846 int *a_retval; 1847 } */ *ap; 1848 { 1849 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1850 1851 switch (ap->a_name) { 1852 case _PC_LINK_MAX: 1853 *ap->a_retval = 1; 1854 return (0); 1855 case _PC_NAME_MAX: 1856 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1857 return (0); 1858 case _PC_PATH_MAX: 1859 *ap->a_retval = PATH_MAX; 1860 return (0); 1861 case _PC_CHOWN_RESTRICTED: 1862 *ap->a_retval = 1; 1863 return (0); 1864 case _PC_NO_TRUNC: 1865 *ap->a_retval = 0; 1866 return (0); 1867 default: 1868 return (EINVAL); 1869 } 1870 /* NOTREACHED */ 1871 } 1872 1873 1874 /* Global vfs data structures for msdosfs */ 1875 vop_t **msdosfs_vnodeop_p; 1876 static struct vnodeopv_entry_desc msdosfs_vnodeop_entries[] = { 1877 { &vop_default_desc, (vop_t *) vop_defaultop }, 1878 { &vop_access_desc, (vop_t *) msdosfs_access }, 1879 { &vop_bmap_desc, (vop_t *) msdosfs_bmap }, 1880 { &vop_cachedlookup_desc, (vop_t *) msdosfs_lookup }, 1881 { &vop_close_desc, (vop_t *) msdosfs_close }, 1882 { &vop_create_desc, (vop_t *) msdosfs_create }, 1883 { &vop_fsync_desc, (vop_t *) msdosfs_fsync }, 1884 { &vop_getattr_desc, (vop_t *) msdosfs_getattr }, 1885 { &vop_inactive_desc, (vop_t *) msdosfs_inactive }, 1886 { &vop_islocked_desc, (vop_t *) vop_stdislocked }, 1887 { &vop_link_desc, (vop_t *) msdosfs_link }, 1888 { &vop_lock_desc, (vop_t *) vop_stdlock }, 1889 { &vop_lookup_desc, (vop_t *) vfs_cache_lookup }, 1890 { &vop_mkdir_desc, (vop_t *) msdosfs_mkdir }, 1891 { &vop_mknod_desc, (vop_t *) msdosfs_mknod }, 1892 { &vop_pathconf_desc, (vop_t *) msdosfs_pathconf }, 1893 { &vop_print_desc, (vop_t *) msdosfs_print }, 1894 { &vop_read_desc, (vop_t *) msdosfs_read }, 1895 { &vop_readdir_desc, (vop_t *) msdosfs_readdir }, 1896 { &vop_reclaim_desc, (vop_t *) msdosfs_reclaim }, 1897 { &vop_remove_desc, (vop_t *) msdosfs_remove }, 1898 { &vop_rename_desc, (vop_t *) msdosfs_rename }, 1899 { &vop_rmdir_desc, (vop_t *) msdosfs_rmdir }, 1900 { &vop_setattr_desc, (vop_t *) msdosfs_setattr }, 1901 { &vop_strategy_desc, (vop_t *) msdosfs_strategy }, 1902 { &vop_symlink_desc, (vop_t *) msdosfs_symlink }, 1903 { &vop_unlock_desc, (vop_t *) vop_stdunlock }, 1904 { &vop_write_desc, (vop_t *) msdosfs_write }, 1905 { NULL, NULL } 1906 }; 1907 static struct vnodeopv_desc msdosfs_vnodeop_opv_desc = 1908 { &msdosfs_vnodeop_p, msdosfs_vnodeop_entries }; 1909 1910 VNODEOP_SET(msdosfs_vnodeop_opv_desc);
Cache object: c4b11f72b06c2c656fd056201f678071
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