1 /* $FreeBSD$ */ 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 <msdosfs/bpb.h> 74 #include <msdosfs/direntry.h> 75 #include <msdosfs/denode.h> 76 #include <msdosfs/msdosfsmount.h> 77 #include <msdosfs/fat.h> 78 79 #define DOS_FILESIZE_MAX 0xffffffff 80 81 /* 82 * Prototypes for MSDOSFS vnode operations 83 */ 84 static int msdosfs_create __P((struct vop_create_args *)); 85 static int msdosfs_mknod __P((struct vop_mknod_args *)); 86 static int msdosfs_close __P((struct vop_close_args *)); 87 static int msdosfs_access __P((struct vop_access_args *)); 88 static int msdosfs_getattr __P((struct vop_getattr_args *)); 89 static int msdosfs_setattr __P((struct vop_setattr_args *)); 90 static int msdosfs_read __P((struct vop_read_args *)); 91 static int msdosfs_write __P((struct vop_write_args *)); 92 static int msdosfs_fsync __P((struct vop_fsync_args *)); 93 static int msdosfs_remove __P((struct vop_remove_args *)); 94 static int msdosfs_link __P((struct vop_link_args *)); 95 static int msdosfs_rename __P((struct vop_rename_args *)); 96 static int msdosfs_mkdir __P((struct vop_mkdir_args *)); 97 static int msdosfs_rmdir __P((struct vop_rmdir_args *)); 98 static int msdosfs_symlink __P((struct vop_symlink_args *)); 99 static int msdosfs_readdir __P((struct vop_readdir_args *)); 100 static int msdosfs_bmap __P((struct vop_bmap_args *)); 101 static int msdosfs_strategy __P((struct vop_strategy_args *)); 102 static int msdosfs_print __P((struct vop_print_args *)); 103 static int msdosfs_pathconf __P((struct vop_pathconf_args *ap)); 104 static int msdosfs_getpages __P((struct vop_getpages_args *)); 105 static int msdosfs_putpages __P((struct vop_putpages_args *)); 106 107 /* 108 * Some general notes: 109 * 110 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 111 * read/written using the vnode for the filesystem. Blocks that represent 112 * the contents of a file are read/written using the vnode for the file 113 * (including directories when they are read/written as files). This 114 * presents problems for the dos filesystem because data that should be in 115 * an inode (if dos had them) resides in the directory itself. Since we 116 * must update directory entries without the benefit of having the vnode 117 * for the directory we must use the vnode for the filesystem. This means 118 * that when a directory is actually read/written (via read, write, or 119 * readdir, or seek) we must use the vnode for the filesystem instead of 120 * the vnode for the directory as would happen in ufs. This is to insure we 121 * retreive the correct block from the buffer cache since the hash value is 122 * based upon the vnode address and the desired block number. 123 */ 124 125 /* 126 * Create a regular file. On entry the directory to contain the file being 127 * created is locked. We must release before we return. We must also free 128 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or 129 * only if the SAVESTART bit in cn_flags is clear on success. 130 */ 131 static int 132 msdosfs_create(ap) 133 struct vop_create_args /* { 134 struct vnode *a_dvp; 135 struct vnode **a_vpp; 136 struct componentname *a_cnp; 137 struct vattr *a_vap; 138 } */ *ap; 139 { 140 struct componentname *cnp = ap->a_cnp; 141 struct denode ndirent; 142 struct denode *dep; 143 struct denode *pdep = VTODE(ap->a_dvp); 144 struct timespec ts; 145 int error; 146 147 #ifdef MSDOSFS_DEBUG 148 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 149 #endif 150 151 /* 152 * If this is the root directory and there is no space left we 153 * can't do anything. This is because the root directory can not 154 * change size. 155 */ 156 if (pdep->de_StartCluster == MSDOSFSROOT 157 && pdep->de_fndoffset >= pdep->de_FileSize) { 158 error = ENOSPC; 159 goto bad; 160 } 161 162 /* 163 * Create a directory entry for the file, then call createde() to 164 * have it installed. NOTE: DOS files are always executable. We 165 * use the absence of the owner write bit to make the file 166 * readonly. 167 */ 168 #ifdef DIAGNOSTIC 169 if ((cnp->cn_flags & HASBUF) == 0) 170 panic("msdosfs_create: no name"); 171 #endif 172 bzero(&ndirent, sizeof(ndirent)); 173 error = uniqdosname(pdep, cnp, ndirent.de_Name); 174 if (error) 175 goto bad; 176 177 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ? 178 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; 179 ndirent.de_LowerCase = 0; 180 ndirent.de_StartCluster = 0; 181 ndirent.de_FileSize = 0; 182 ndirent.de_dev = pdep->de_dev; 183 ndirent.de_devvp = pdep->de_devvp; 184 ndirent.de_pmp = pdep->de_pmp; 185 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 186 getnanotime(&ts); 187 DETIMES(&ndirent, &ts, &ts, &ts); 188 error = createde(&ndirent, pdep, &dep, cnp); 189 if (error) 190 goto bad; 191 *ap->a_vpp = DETOV(dep); 192 return (0); 193 194 bad: 195 return (error); 196 } 197 198 static int 199 msdosfs_mknod(ap) 200 struct vop_mknod_args /* { 201 struct vnode *a_dvp; 202 struct vnode **a_vpp; 203 struct componentname *a_cnp; 204 struct vattr *a_vap; 205 } */ *ap; 206 { 207 208 switch (ap->a_vap->va_type) { 209 case VDIR: 210 return (msdosfs_mkdir((struct vop_mkdir_args *)ap)); 211 break; 212 213 case VREG: 214 return (msdosfs_create((struct vop_create_args *)ap)); 215 break; 216 217 default: 218 return (EINVAL); 219 } 220 /* NOTREACHED */ 221 } 222 223 static int 224 msdosfs_close(ap) 225 struct vop_close_args /* { 226 struct vnode *a_vp; 227 int a_fflag; 228 struct ucred *a_cred; 229 struct proc *a_p; 230 } */ *ap; 231 { 232 struct vnode *vp = ap->a_vp; 233 struct denode *dep = VTODE(vp); 234 struct timespec ts; 235 236 mtx_enter(&vp->v_interlock, MTX_DEF); 237 if (vp->v_usecount > 1) { 238 getnanotime(&ts); 239 DETIMES(dep, &ts, &ts, &ts); 240 } 241 mtx_exit(&vp->v_interlock, MTX_DEF); 242 return 0; 243 } 244 245 static int 246 msdosfs_access(ap) 247 struct vop_access_args /* { 248 struct vnode *a_vp; 249 int a_mode; 250 struct ucred *a_cred; 251 struct proc *a_p; 252 } */ *ap; 253 { 254 struct vnode *vp = ap->a_vp; 255 struct denode *dep = VTODE(ap->a_vp); 256 struct msdosfsmount *pmp = dep->de_pmp; 257 mode_t file_mode, mode = ap->a_mode; 258 259 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) | 260 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH)); 261 file_mode &= pmp->pm_mask; 262 263 /* 264 * Disallow write attempts on read-only file systems; 265 * unless the file is a socket, fifo, or a block or 266 * character device resident on the file system. 267 */ 268 if (mode & VWRITE) { 269 switch (vp->v_type) { 270 case VDIR: 271 case VLNK: 272 case VREG: 273 if (vp->v_mount->mnt_flag & MNT_RDONLY) 274 return (EROFS); 275 break; 276 default: 277 break; 278 } 279 } 280 281 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, 282 ap->a_mode, ap->a_cred, NULL)); 283 } 284 285 static int 286 msdosfs_getattr(ap) 287 struct vop_getattr_args /* { 288 struct vnode *a_vp; 289 struct vattr *a_vap; 290 struct ucred *a_cred; 291 struct proc *a_p; 292 } */ *ap; 293 { 294 struct denode *dep = VTODE(ap->a_vp); 295 struct msdosfsmount *pmp = dep->de_pmp; 296 struct vattr *vap = ap->a_vap; 297 mode_t mode; 298 struct timespec ts; 299 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 300 u_long fileid; 301 302 getnanotime(&ts); 303 DETIMES(dep, &ts, &ts, &ts); 304 vap->va_fsid = dev2udev(dep->de_dev); 305 /* 306 * The following computation of the fileid must be the same as that 307 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 308 * doesn't work. 309 */ 310 if (dep->de_Attributes & ATTR_DIRECTORY) { 311 fileid = cntobn(pmp, dep->de_StartCluster) * dirsperblk; 312 if (dep->de_StartCluster == MSDOSFSROOT) 313 fileid = 1; 314 } else { 315 fileid = cntobn(pmp, dep->de_dirclust) * dirsperblk; 316 if (dep->de_dirclust == MSDOSFSROOT) 317 fileid = roottobn(pmp, 0) * dirsperblk; 318 fileid += dep->de_diroffset / sizeof(struct direntry); 319 } 320 vap->va_fileid = fileid; 321 if ((dep->de_Attributes & ATTR_READONLY) == 0) 322 mode = S_IRWXU|S_IRWXG|S_IRWXO; 323 else 324 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 325 vap->va_mode = mode & pmp->pm_mask; 326 vap->va_uid = pmp->pm_uid; 327 vap->va_gid = pmp->pm_gid; 328 vap->va_nlink = 1; 329 vap->va_rdev = 0; 330 vap->va_size = dep->de_FileSize; 331 dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime); 332 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 333 dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime); 334 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, &vap->va_ctime); 335 } else { 336 vap->va_atime = vap->va_mtime; 337 vap->va_ctime = vap->va_mtime; 338 } 339 vap->va_flags = 0; 340 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) 341 vap->va_flags |= SF_ARCHIVED; 342 vap->va_gen = 0; 343 vap->va_blocksize = pmp->pm_bpcluster; 344 vap->va_bytes = 345 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 346 vap->va_type = ap->a_vp->v_type; 347 vap->va_filerev = dep->de_modrev; 348 return (0); 349 } 350 351 static int 352 msdosfs_setattr(ap) 353 struct vop_setattr_args /* { 354 struct vnode *a_vp; 355 struct vattr *a_vap; 356 struct ucred *a_cred; 357 struct proc *a_p; 358 } */ *ap; 359 { 360 struct vnode *vp = ap->a_vp; 361 struct denode *dep = VTODE(ap->a_vp); 362 struct msdosfsmount *pmp = dep->de_pmp; 363 struct vattr *vap = ap->a_vap; 364 struct ucred *cred = ap->a_cred; 365 int error = 0; 366 367 #ifdef MSDOSFS_DEBUG 368 printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n", 369 ap->a_vp, vap, cred, ap->a_p); 370 #endif 371 372 /* 373 * Check for unsettable attributes. 374 */ 375 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 376 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 377 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 378 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 379 #ifdef MSDOSFS_DEBUG 380 printf("msdosfs_setattr(): returning EINVAL\n"); 381 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", 382 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 383 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n", 384 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 385 printf(" va_uid %x, va_gid %x\n", 386 vap->va_uid, vap->va_gid); 387 #endif 388 return (EINVAL); 389 } 390 if (vap->va_flags != VNOVAL) { 391 if (vp->v_mount->mnt_flag & MNT_RDONLY) 392 return (EROFS); 393 if (cred->cr_uid != pmp->pm_uid && 394 (error = suser_xxx(cred, ap->a_p, PRISON_ROOT))) 395 return (error); 396 /* 397 * We are very inconsistent about handling unsupported 398 * attributes. We ignored the access time and the 399 * read and execute bits. We were strict for the other 400 * attributes. 401 * 402 * Here we are strict, stricter than ufs in not allowing 403 * users to attempt to set SF_SETTABLE bits or anyone to 404 * set unsupported bits. However, we ignore attempts to 405 * set ATTR_ARCHIVE for directories `cp -pr' from a more 406 * sensible file system attempts it a lot. 407 */ 408 if (cred->cr_uid != 0) { 409 if (vap->va_flags & SF_SETTABLE) 410 return EPERM; 411 } 412 if (vap->va_flags & ~SF_ARCHIVED) 413 return EOPNOTSUPP; 414 if (vap->va_flags & SF_ARCHIVED) 415 dep->de_Attributes &= ~ATTR_ARCHIVE; 416 else if (!(dep->de_Attributes & ATTR_DIRECTORY)) 417 dep->de_Attributes |= ATTR_ARCHIVE; 418 dep->de_flag |= DE_MODIFIED; 419 } 420 421 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 422 uid_t uid; 423 gid_t gid; 424 425 if (vp->v_mount->mnt_flag & MNT_RDONLY) 426 return (EROFS); 427 uid = vap->va_uid; 428 if (uid == (uid_t)VNOVAL) 429 uid = pmp->pm_uid; 430 gid = vap->va_gid; 431 if (gid == (gid_t)VNOVAL) 432 gid = pmp->pm_gid; 433 if ((cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 434 (gid != pmp->pm_gid && !groupmember(gid, cred))) && 435 (error = suser_xxx(cred, ap->a_p, PRISON_ROOT))) 436 return error; 437 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 438 return EINVAL; 439 } 440 441 if (vap->va_size != VNOVAL) { 442 /* 443 * Disallow write attempts on read-only file systems; 444 * unless the file is a socket, fifo, or a block or 445 * character device resident on the file system. 446 */ 447 switch (vp->v_type) { 448 case VDIR: 449 return (EISDIR); 450 /* NOT REACHED */ 451 case VLNK: 452 case VREG: 453 if (vp->v_mount->mnt_flag & MNT_RDONLY) 454 return (EROFS); 455 break; 456 default: 457 break; 458 } 459 error = detrunc(dep, vap->va_size, 0, cred, ap->a_p); 460 if (error) 461 return error; 462 } 463 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 464 if (vp->v_mount->mnt_flag & MNT_RDONLY) 465 return (EROFS); 466 if (cred->cr_uid != pmp->pm_uid && 467 (error = suser_xxx(cred, ap->a_p, PRISON_ROOT)) && 468 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 469 (error = VOP_ACCESS(ap->a_vp, VWRITE, cred, ap->a_p)))) 470 return (error); 471 if (vp->v_type != VDIR) { 472 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 473 vap->va_atime.tv_sec != VNOVAL) 474 unix2dostime(&vap->va_atime, &dep->de_ADate, NULL, NULL); 475 if (vap->va_mtime.tv_sec != VNOVAL) 476 unix2dostime(&vap->va_mtime, &dep->de_MDate, &dep->de_MTime, NULL); 477 dep->de_Attributes |= ATTR_ARCHIVE; 478 dep->de_flag |= DE_MODIFIED; 479 } 480 } 481 /* 482 * DOS files only have the ability to have their writability 483 * attribute set, so we use the owner write bit to set the readonly 484 * attribute. 485 */ 486 if (vap->va_mode != (mode_t)VNOVAL) { 487 if (vp->v_mount->mnt_flag & MNT_RDONLY) 488 return (EROFS); 489 if (cred->cr_uid != pmp->pm_uid && 490 (error = suser_xxx(cred, ap->a_p, PRISON_ROOT))) 491 return (error); 492 if (vp->v_type != VDIR) { 493 /* We ignore the read and execute bits. */ 494 if (vap->va_mode & VWRITE) 495 dep->de_Attributes &= ~ATTR_READONLY; 496 else 497 dep->de_Attributes |= ATTR_READONLY; 498 dep->de_flag |= DE_MODIFIED; 499 } 500 } 501 return (deupdat(dep, 1)); 502 } 503 504 static int 505 msdosfs_read(ap) 506 struct vop_read_args /* { 507 struct vnode *a_vp; 508 struct uio *a_uio; 509 int a_ioflag; 510 struct ucred *a_cred; 511 } */ *ap; 512 { 513 int error = 0; 514 int blsize; 515 int isadir; 516 int orig_resid; 517 u_int n; 518 u_long diff; 519 u_long on; 520 daddr_t lbn; 521 daddr_t rablock; 522 int rasize; 523 int seqcount; 524 struct buf *bp; 525 struct vnode *vp = ap->a_vp; 526 struct denode *dep = VTODE(vp); 527 struct msdosfsmount *pmp = dep->de_pmp; 528 struct uio *uio = ap->a_uio; 529 530 if (uio->uio_offset < 0) 531 return (EINVAL); 532 533 if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX) 534 return (0); 535 /* 536 * If they didn't ask for any data, then we are done. 537 */ 538 orig_resid = uio->uio_resid; 539 if (orig_resid <= 0) 540 return (0); 541 542 seqcount = ap->a_ioflag >> 16; 543 544 isadir = dep->de_Attributes & ATTR_DIRECTORY; 545 do { 546 if (uio->uio_offset >= dep->de_FileSize) 547 break; 548 lbn = de_cluster(pmp, uio->uio_offset); 549 /* 550 * If we are operating on a directory file then be sure to 551 * do i/o with the vnode for the filesystem instead of the 552 * vnode for the directory. 553 */ 554 if (isadir) { 555 /* convert cluster # to block # */ 556 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 557 if (error == E2BIG) { 558 error = EINVAL; 559 break; 560 } else if (error) 561 break; 562 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 563 } else { 564 blsize = pmp->pm_bpcluster; 565 rablock = lbn + 1; 566 if (seqcount > 1 && 567 de_cn2off(pmp, rablock) < dep->de_FileSize) { 568 rasize = pmp->pm_bpcluster; 569 error = breadn(vp, lbn, blsize, 570 &rablock, &rasize, 1, NOCRED, &bp); 571 } else { 572 error = bread(vp, lbn, blsize, NOCRED, &bp); 573 } 574 } 575 if (error) { 576 brelse(bp); 577 break; 578 } 579 on = uio->uio_offset & pmp->pm_crbomask; 580 diff = pmp->pm_bpcluster - on; 581 n = diff > uio->uio_resid ? uio->uio_resid : diff; 582 diff = dep->de_FileSize - uio->uio_offset; 583 if (diff < n) 584 n = diff; 585 diff = blsize - bp->b_resid; 586 if (diff < n) 587 n = diff; 588 error = uiomove(bp->b_data + on, (int) n, uio); 589 brelse(bp); 590 } while (error == 0 && uio->uio_resid > 0 && n != 0); 591 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 592 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 593 dep->de_flag |= DE_ACCESS; 594 return (error); 595 } 596 597 /* 598 * Write data to a file or directory. 599 */ 600 static int 601 msdosfs_write(ap) 602 struct vop_write_args /* { 603 struct vnode *a_vp; 604 struct uio *a_uio; 605 int a_ioflag; 606 struct ucred *a_cred; 607 } */ *ap; 608 { 609 int n; 610 int croffset; 611 int resid; 612 u_long osize; 613 int error = 0; 614 u_long count; 615 daddr_t bn, lastcn; 616 struct buf *bp; 617 int ioflag = ap->a_ioflag; 618 struct uio *uio = ap->a_uio; 619 struct proc *p = uio->uio_procp; 620 struct vnode *vp = ap->a_vp; 621 struct vnode *thisvp; 622 struct denode *dep = VTODE(vp); 623 struct msdosfsmount *pmp = dep->de_pmp; 624 struct ucred *cred = ap->a_cred; 625 626 #ifdef MSDOSFS_DEBUG 627 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 628 vp, uio, ioflag, cred); 629 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 630 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 631 #endif 632 633 switch (vp->v_type) { 634 case VREG: 635 if (ioflag & IO_APPEND) 636 uio->uio_offset = dep->de_FileSize; 637 thisvp = vp; 638 break; 639 case VDIR: 640 return EISDIR; 641 default: 642 panic("msdosfs_write(): bad file type"); 643 } 644 645 if (uio->uio_offset < 0) 646 return (EFBIG); 647 648 if (uio->uio_resid == 0) 649 return (0); 650 651 /* 652 * If they've exceeded their filesize limit, tell them about it. 653 */ 654 if (p && 655 ((uoff_t)uio->uio_offset + uio->uio_resid > 656 p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) { 657 psignal(p, SIGXFSZ); 658 return (EFBIG); 659 } 660 661 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) 662 return (EFBIG); 663 664 /* 665 * If the offset we are starting the write at is beyond the end of 666 * the file, then they've done a seek. Unix filesystems allow 667 * files with holes in them, DOS doesn't so we must fill the hole 668 * with zeroed blocks. 669 */ 670 if (uio->uio_offset > dep->de_FileSize) { 671 error = deextend(dep, uio->uio_offset, cred); 672 if (error) 673 return (error); 674 } 675 676 /* 677 * Remember some values in case the write fails. 678 */ 679 resid = uio->uio_resid; 680 osize = dep->de_FileSize; 681 682 /* 683 * If we write beyond the end of the file, extend it to its ultimate 684 * size ahead of the time to hopefully get a contiguous area. 685 */ 686 if (uio->uio_offset + resid > osize) { 687 count = de_clcount(pmp, uio->uio_offset + resid) - 688 de_clcount(pmp, osize); 689 error = extendfile(dep, count, NULL, NULL, 0); 690 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 691 goto errexit; 692 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 693 } else 694 lastcn = de_clcount(pmp, osize) - 1; 695 696 do { 697 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 698 error = ENOSPC; 699 break; 700 } 701 702 croffset = uio->uio_offset & pmp->pm_crbomask; 703 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 704 if (uio->uio_offset + n > dep->de_FileSize) { 705 dep->de_FileSize = uio->uio_offset + n; 706 /* The object size needs to be set before buffer is allocated */ 707 vnode_pager_setsize(vp, dep->de_FileSize); 708 } 709 710 bn = de_cluster(pmp, uio->uio_offset); 711 if ((uio->uio_offset & pmp->pm_crbomask) == 0 712 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 713 > de_cluster(pmp, uio->uio_offset) 714 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 715 /* 716 * If either the whole cluster gets written, 717 * or we write the cluster from its start beyond EOF, 718 * then no need to read data from disk. 719 */ 720 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0); 721 clrbuf(bp); 722 /* 723 * Do the bmap now, since pcbmap needs buffers 724 * for the fat table. (see msdosfs_strategy) 725 */ 726 if (bp->b_blkno == bp->b_lblkno) { 727 error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno, 728 0, 0); 729 if (error) 730 bp->b_blkno = -1; 731 } 732 if (bp->b_blkno == -1) { 733 brelse(bp); 734 if (!error) 735 error = EIO; /* XXX */ 736 break; 737 } 738 } else { 739 /* 740 * The block we need to write into exists, so read it in. 741 */ 742 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 743 if (error) { 744 brelse(bp); 745 break; 746 } 747 } 748 749 /* 750 * Should these vnode_pager_* functions be done on dir 751 * files? 752 */ 753 754 /* 755 * Copy the data from user space into the buf header. 756 */ 757 error = uiomove(bp->b_data + croffset, n, uio); 758 if (error) { 759 brelse(bp); 760 break; 761 } 762 763 /* 764 * If they want this synchronous then write it and wait for 765 * it. Otherwise, if on a cluster boundary write it 766 * asynchronously so we can move on to the next block 767 * without delay. Otherwise do a delayed write because we 768 * may want to write somemore into the block later. 769 */ 770 if (ioflag & IO_SYNC) 771 (void) bwrite(bp); 772 else if (n + croffset == pmp->pm_bpcluster) 773 bawrite(bp); 774 else 775 bdwrite(bp); 776 dep->de_flag |= DE_UPDATE; 777 } while (error == 0 && uio->uio_resid > 0); 778 779 /* 780 * If the write failed and they want us to, truncate the file back 781 * to the size it was before the write was attempted. 782 */ 783 errexit: 784 if (error) { 785 if (ioflag & IO_UNIT) { 786 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL); 787 uio->uio_offset -= resid - uio->uio_resid; 788 uio->uio_resid = resid; 789 } else { 790 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL); 791 if (uio->uio_resid != resid) 792 error = 0; 793 } 794 } else if (ioflag & IO_SYNC) 795 error = deupdat(dep, 1); 796 return (error); 797 } 798 799 /* 800 * Flush the blocks of a file to disk. 801 * 802 * This function is worthless for vnodes that represent directories. Maybe we 803 * could just do a sync if they try an fsync on a directory file. 804 */ 805 static int 806 msdosfs_fsync(ap) 807 struct vop_fsync_args /* { 808 struct vnode *a_vp; 809 struct ucred *a_cred; 810 int a_waitfor; 811 struct proc *a_p; 812 } */ *ap; 813 { 814 struct vnode *vp = ap->a_vp; 815 int s; 816 struct buf *bp, *nbp; 817 818 /* 819 * Flush all dirty buffers associated with a vnode. 820 */ 821 loop: 822 s = splbio(); 823 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 824 nbp = TAILQ_NEXT(bp, b_vnbufs); 825 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) 826 continue; 827 if ((bp->b_flags & B_DELWRI) == 0) 828 panic("msdosfs_fsync: not dirty"); 829 bremfree(bp); 830 splx(s); 831 (void) bwrite(bp); 832 goto loop; 833 } 834 while (vp->v_numoutput) { 835 vp->v_flag |= VBWAIT; 836 (void) tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "msdosfsn", 0); 837 } 838 #ifdef DIAGNOSTIC 839 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) { 840 vprint("msdosfs_fsync: dirty", vp); 841 goto loop; 842 } 843 #endif 844 splx(s); 845 return (deupdat(VTODE(vp), ap->a_waitfor == MNT_WAIT)); 846 } 847 848 static int 849 msdosfs_remove(ap) 850 struct vop_remove_args /* { 851 struct vnode *a_dvp; 852 struct vnode *a_vp; 853 struct componentname *a_cnp; 854 } */ *ap; 855 { 856 struct denode *dep = VTODE(ap->a_vp); 857 struct denode *ddep = VTODE(ap->a_dvp); 858 int error; 859 860 if (ap->a_vp->v_type == VDIR) 861 error = EPERM; 862 else 863 error = removede(ddep, dep); 864 #ifdef MSDOSFS_DEBUG 865 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 866 #endif 867 return (error); 868 } 869 870 /* 871 * DOS filesystems don't know what links are. 872 */ 873 static int 874 msdosfs_link(ap) 875 struct vop_link_args /* { 876 struct vnode *a_tdvp; 877 struct vnode *a_vp; 878 struct componentname *a_cnp; 879 } */ *ap; 880 { 881 return (EOPNOTSUPP); 882 } 883 884 /* 885 * Renames on files require moving the denode to a new hash queue since the 886 * denode's location is used to compute which hash queue to put the file 887 * in. Unless it is a rename in place. For example "mv a b". 888 * 889 * What follows is the basic algorithm: 890 * 891 * if (file move) { 892 * if (dest file exists) { 893 * remove dest file 894 * } 895 * if (dest and src in same directory) { 896 * rewrite name in existing directory slot 897 * } else { 898 * write new entry in dest directory 899 * update offset and dirclust in denode 900 * move denode to new hash chain 901 * clear old directory entry 902 * } 903 * } else { 904 * directory move 905 * if (dest directory exists) { 906 * if (dest is not empty) { 907 * return ENOTEMPTY 908 * } 909 * remove dest directory 910 * } 911 * if (dest and src in same directory) { 912 * rewrite name in existing entry 913 * } else { 914 * be sure dest is not a child of src directory 915 * write entry in dest directory 916 * update "." and ".." in moved directory 917 * clear old directory entry for moved directory 918 * } 919 * } 920 * 921 * On entry: 922 * source's parent directory is unlocked 923 * source file or directory is unlocked 924 * destination's parent directory is locked 925 * destination file or directory is locked if it exists 926 * 927 * On exit: 928 * all denodes should be released 929 */ 930 static int 931 msdosfs_rename(ap) 932 struct vop_rename_args /* { 933 struct vnode *a_fdvp; 934 struct vnode *a_fvp; 935 struct componentname *a_fcnp; 936 struct vnode *a_tdvp; 937 struct vnode *a_tvp; 938 struct componentname *a_tcnp; 939 } */ *ap; 940 { 941 struct vnode *tdvp = ap->a_tdvp; 942 struct vnode *fvp = ap->a_fvp; 943 struct vnode *fdvp = ap->a_fdvp; 944 struct vnode *tvp = ap->a_tvp; 945 struct componentname *tcnp = ap->a_tcnp; 946 struct componentname *fcnp = ap->a_fcnp; 947 struct proc *p = fcnp->cn_proc; 948 struct denode *ip, *xp, *dp, *zp; 949 u_char toname[11], oldname[11]; 950 u_long from_diroffset, to_diroffset; 951 u_char to_count; 952 int doingdirectory = 0, newparent = 0; 953 int error; 954 u_long cn; 955 daddr_t bn; 956 struct denode *fddep; /* from file's parent directory */ 957 struct denode *fdep; /* from file or directory */ 958 struct denode *tddep; /* to file's parent directory */ 959 struct denode *tdep; /* to file or directory */ 960 struct msdosfsmount *pmp; 961 struct direntry *dotdotp; 962 struct buf *bp; 963 964 fddep = VTODE(ap->a_fdvp); 965 fdep = VTODE(ap->a_fvp); 966 tddep = VTODE(ap->a_tdvp); 967 tdep = tvp ? VTODE(tvp) : NULL; 968 pmp = fddep->de_pmp; 969 970 pmp = VFSTOMSDOSFS(fdvp->v_mount); 971 972 #ifdef DIAGNOSTIC 973 if ((tcnp->cn_flags & HASBUF) == 0 || 974 (fcnp->cn_flags & HASBUF) == 0) 975 panic("msdosfs_rename: no name"); 976 #endif 977 /* 978 * Check for cross-device rename. 979 */ 980 if ((fvp->v_mount != tdvp->v_mount) || 981 (tvp && (fvp->v_mount != tvp->v_mount))) { 982 error = EXDEV; 983 abortit: 984 if (tdvp == tvp) 985 vrele(tdvp); 986 else 987 vput(tdvp); 988 if (tvp) 989 vput(tvp); 990 vrele(fdvp); 991 vrele(fvp); 992 return (error); 993 } 994 995 /* 996 * If source and dest are the same, do nothing. 997 */ 998 if (tvp == fvp) { 999 error = 0; 1000 goto abortit; 1001 } 1002 1003 error = vn_lock(fvp, LK_EXCLUSIVE, p); 1004 if (error) 1005 goto abortit; 1006 dp = VTODE(fdvp); 1007 ip = VTODE(fvp); 1008 1009 /* 1010 * Be sure we are not renaming ".", "..", or an alias of ".". This 1011 * leads to a crippled directory tree. It's pretty tough to do a 1012 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1013 * doesn't work if the ".." entry is missing. 1014 */ 1015 if (ip->de_Attributes & ATTR_DIRECTORY) { 1016 /* 1017 * Avoid ".", "..", and aliases of "." for obvious reasons. 1018 */ 1019 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1020 dp == ip || 1021 (fcnp->cn_flags & ISDOTDOT) || 1022 (tcnp->cn_flags & ISDOTDOT) || 1023 (ip->de_flag & DE_RENAME)) { 1024 VOP_UNLOCK(fvp, 0, p); 1025 error = EINVAL; 1026 goto abortit; 1027 } 1028 ip->de_flag |= DE_RENAME; 1029 doingdirectory++; 1030 } 1031 1032 /* 1033 * When the target exists, both the directory 1034 * and target vnodes are returned locked. 1035 */ 1036 dp = VTODE(tdvp); 1037 xp = tvp ? VTODE(tvp) : NULL; 1038 /* 1039 * Remember direntry place to use for destination 1040 */ 1041 to_diroffset = dp->de_fndoffset; 1042 to_count = dp->de_fndcnt; 1043 1044 /* 1045 * If ".." must be changed (ie the directory gets a new 1046 * parent) then the source directory must not be in the 1047 * directory heirarchy above the target, as this would 1048 * orphan everything below the source directory. Also 1049 * the user must have write permission in the source so 1050 * as to be able to change "..". We must repeat the call 1051 * to namei, as the parent directory is unlocked by the 1052 * call to doscheckpath(). 1053 */ 1054 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc); 1055 VOP_UNLOCK(fvp, 0, p); 1056 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1057 newparent = 1; 1058 if (doingdirectory && newparent) { 1059 if (error) /* write access check above */ 1060 goto bad; 1061 if (xp != NULL) 1062 vput(tvp); 1063 /* 1064 * doscheckpath() vput()'s dp, 1065 * so we have to do a relookup afterwards 1066 */ 1067 error = doscheckpath(ip, dp); 1068 if (error) 1069 goto out; 1070 if ((tcnp->cn_flags & SAVESTART) == 0) 1071 panic("msdosfs_rename: lost to startdir"); 1072 error = relookup(tdvp, &tvp, tcnp); 1073 if (error) 1074 goto out; 1075 dp = VTODE(tdvp); 1076 xp = tvp ? VTODE(tvp) : NULL; 1077 } 1078 1079 if (xp != NULL) { 1080 /* 1081 * Target must be empty if a directory and have no links 1082 * to it. Also, ensure source and target are compatible 1083 * (both directories, or both not directories). 1084 */ 1085 if (xp->de_Attributes & ATTR_DIRECTORY) { 1086 if (!dosdirempty(xp)) { 1087 error = ENOTEMPTY; 1088 goto bad; 1089 } 1090 if (!doingdirectory) { 1091 error = ENOTDIR; 1092 goto bad; 1093 } 1094 cache_purge(tdvp); 1095 } else if (doingdirectory) { 1096 error = EISDIR; 1097 goto bad; 1098 } 1099 error = removede(dp, xp); 1100 if (error) 1101 goto bad; 1102 vput(tvp); 1103 xp = NULL; 1104 } 1105 1106 /* 1107 * Convert the filename in tcnp into a dos filename. We copy this 1108 * into the denode and directory entry for the destination 1109 * file/directory. 1110 */ 1111 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1112 if (error) 1113 goto abortit; 1114 1115 /* 1116 * Since from wasn't locked at various places above, 1117 * have to do a relookup here. 1118 */ 1119 fcnp->cn_flags &= ~MODMASK; 1120 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1121 if ((fcnp->cn_flags & SAVESTART) == 0) 1122 panic("msdosfs_rename: lost from startdir"); 1123 if (!newparent) 1124 VOP_UNLOCK(tdvp, 0, p); 1125 if (relookup(fdvp, &fvp, fcnp) == 0) 1126 vrele(fdvp); 1127 if (fvp == NULL) { 1128 /* 1129 * From name has disappeared. 1130 */ 1131 if (doingdirectory) 1132 panic("rename: lost dir entry"); 1133 vrele(ap->a_fvp); 1134 if (newparent) 1135 VOP_UNLOCK(tdvp, 0, p); 1136 vrele(tdvp); 1137 return 0; 1138 } 1139 xp = VTODE(fvp); 1140 zp = VTODE(fdvp); 1141 from_diroffset = zp->de_fndoffset; 1142 1143 /* 1144 * Ensure that the directory entry still exists and has not 1145 * changed till now. If the source is a file the entry may 1146 * have been unlinked or renamed. In either case there is 1147 * no further work to be done. If the source is a directory 1148 * then it cannot have been rmdir'ed or renamed; this is 1149 * prohibited by the DE_RENAME flag. 1150 */ 1151 if (xp != ip) { 1152 if (doingdirectory) 1153 panic("rename: lost dir entry"); 1154 vrele(ap->a_fvp); 1155 VOP_UNLOCK(fvp, 0, p); 1156 if (newparent) 1157 VOP_UNLOCK(fdvp, 0, p); 1158 xp = NULL; 1159 } else { 1160 vrele(fvp); 1161 xp = NULL; 1162 1163 /* 1164 * First write a new entry in the destination 1165 * directory and mark the entry in the source directory 1166 * as deleted. Then move the denode to the correct hash 1167 * chain for its new location in the filesystem. And, if 1168 * we moved a directory, then update its .. entry to point 1169 * to the new parent directory. 1170 */ 1171 bcopy(ip->de_Name, oldname, 11); 1172 bcopy(toname, ip->de_Name, 11); /* update denode */ 1173 dp->de_fndoffset = to_diroffset; 1174 dp->de_fndcnt = to_count; 1175 error = createde(ip, dp, (struct denode **)0, tcnp); 1176 if (error) { 1177 bcopy(oldname, ip->de_Name, 11); 1178 if (newparent) 1179 VOP_UNLOCK(fdvp, 0, p); 1180 VOP_UNLOCK(fvp, 0, p); 1181 goto bad; 1182 } 1183 ip->de_refcnt++; 1184 zp->de_fndoffset = from_diroffset; 1185 error = removede(zp, ip); 1186 if (error) { 1187 /* XXX should really panic here, fs is corrupt */ 1188 if (newparent) 1189 VOP_UNLOCK(fdvp, 0, p); 1190 VOP_UNLOCK(fvp, 0, p); 1191 goto bad; 1192 } 1193 if (!doingdirectory) { 1194 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1195 &ip->de_dirclust, 0); 1196 if (error) { 1197 /* XXX should really panic here, fs is corrupt */ 1198 if (newparent) 1199 VOP_UNLOCK(fdvp, 0, p); 1200 VOP_UNLOCK(fvp, 0, p); 1201 goto bad; 1202 } 1203 if (ip->de_dirclust == MSDOSFSROOT) 1204 ip->de_diroffset = to_diroffset; 1205 else 1206 ip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1207 } 1208 reinsert(ip); 1209 if (newparent) 1210 VOP_UNLOCK(fdvp, 0, p); 1211 } 1212 1213 /* 1214 * If we moved a directory to a new parent directory, then we must 1215 * fixup the ".." entry in the moved directory. 1216 */ 1217 if (doingdirectory && newparent) { 1218 cn = ip->de_StartCluster; 1219 if (cn == MSDOSFSROOT) { 1220 /* this should never happen */ 1221 panic("msdosfs_rename(): updating .. in root directory?"); 1222 } else 1223 bn = cntobn(pmp, cn); 1224 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1225 NOCRED, &bp); 1226 if (error) { 1227 /* XXX should really panic here, fs is corrupt */ 1228 brelse(bp); 1229 VOP_UNLOCK(fvp, 0, p); 1230 goto bad; 1231 } 1232 dotdotp = (struct direntry *)bp->b_data + 1; 1233 putushort(dotdotp->deStartCluster, dp->de_StartCluster); 1234 if (FAT32(pmp)) 1235 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16); 1236 error = bwrite(bp); 1237 if (error) { 1238 /* XXX should really panic here, fs is corrupt */ 1239 VOP_UNLOCK(fvp, 0, p); 1240 goto bad; 1241 } 1242 } 1243 1244 VOP_UNLOCK(fvp, 0, p); 1245 bad: 1246 if (xp) 1247 vput(tvp); 1248 vput(tdvp); 1249 out: 1250 ip->de_flag &= ~DE_RENAME; 1251 vrele(fdvp); 1252 vrele(fvp); 1253 return (error); 1254 1255 } 1256 1257 static struct { 1258 struct direntry dot; 1259 struct direntry dotdot; 1260 } dosdirtemplate = { 1261 { ". ", " ", /* the . entry */ 1262 ATTR_DIRECTORY, /* file attribute */ 1263 0, /* reserved */ 1264 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1265 { 0, 0 }, /* access date */ 1266 { 0, 0 }, /* high bits of start cluster */ 1267 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1268 { 0, 0 }, /* startcluster */ 1269 { 0, 0, 0, 0 } /* filesize */ 1270 }, 1271 { ".. ", " ", /* the .. entry */ 1272 ATTR_DIRECTORY, /* file attribute */ 1273 0, /* reserved */ 1274 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1275 { 0, 0 }, /* access date */ 1276 { 0, 0 }, /* high bits of start cluster */ 1277 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1278 { 0, 0 }, /* startcluster */ 1279 { 0, 0, 0, 0 } /* filesize */ 1280 } 1281 }; 1282 1283 static int 1284 msdosfs_mkdir(ap) 1285 struct vop_mkdir_args /* { 1286 struct vnode *a_dvp; 1287 struvt vnode **a_vpp; 1288 struvt componentname *a_cnp; 1289 struct vattr *a_vap; 1290 } */ *ap; 1291 { 1292 struct componentname *cnp = ap->a_cnp; 1293 struct denode *dep; 1294 struct denode *pdep = VTODE(ap->a_dvp); 1295 struct direntry *denp; 1296 struct msdosfsmount *pmp = pdep->de_pmp; 1297 struct buf *bp; 1298 u_long newcluster, pcl; 1299 int bn; 1300 int error; 1301 struct denode ndirent; 1302 struct timespec ts; 1303 1304 /* 1305 * If this is the root directory and there is no space left we 1306 * can't do anything. This is because the root directory can not 1307 * change size. 1308 */ 1309 if (pdep->de_StartCluster == MSDOSFSROOT 1310 && pdep->de_fndoffset >= pdep->de_FileSize) { 1311 error = ENOSPC; 1312 goto bad2; 1313 } 1314 1315 /* 1316 * Allocate a cluster to hold the about to be created directory. 1317 */ 1318 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1319 if (error) 1320 goto bad2; 1321 1322 bzero(&ndirent, sizeof(ndirent)); 1323 ndirent.de_pmp = pmp; 1324 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1325 getnanotime(&ts); 1326 DETIMES(&ndirent, &ts, &ts, &ts); 1327 1328 /* 1329 * Now fill the cluster with the "." and ".." entries. And write 1330 * the cluster to disk. This way it is there for the parent 1331 * directory to be pointing at if there were a crash. 1332 */ 1333 bn = cntobn(pmp, newcluster); 1334 /* always succeeds */ 1335 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0); 1336 bzero(bp->b_data, pmp->pm_bpcluster); 1337 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1338 denp = (struct direntry *)bp->b_data; 1339 putushort(denp[0].deStartCluster, newcluster); 1340 putushort(denp[0].deCDate, ndirent.de_CDate); 1341 putushort(denp[0].deCTime, ndirent.de_CTime); 1342 denp[0].deCHundredth = ndirent.de_CHun; 1343 putushort(denp[0].deADate, ndirent.de_ADate); 1344 putushort(denp[0].deMDate, ndirent.de_MDate); 1345 putushort(denp[0].deMTime, ndirent.de_MTime); 1346 pcl = pdep->de_StartCluster; 1347 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1348 pcl = 0; 1349 putushort(denp[1].deStartCluster, pcl); 1350 putushort(denp[1].deCDate, ndirent.de_CDate); 1351 putushort(denp[1].deCTime, ndirent.de_CTime); 1352 denp[1].deCHundredth = ndirent.de_CHun; 1353 putushort(denp[1].deADate, ndirent.de_ADate); 1354 putushort(denp[1].deMDate, ndirent.de_MDate); 1355 putushort(denp[1].deMTime, ndirent.de_MTime); 1356 if (FAT32(pmp)) { 1357 putushort(denp[0].deHighClust, newcluster >> 16); 1358 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 1359 } 1360 1361 error = bwrite(bp); 1362 if (error) 1363 goto bad; 1364 1365 /* 1366 * Now build up a directory entry pointing to the newly allocated 1367 * cluster. This will be written to an empty slot in the parent 1368 * directory. 1369 */ 1370 #ifdef DIAGNOSTIC 1371 if ((cnp->cn_flags & HASBUF) == 0) 1372 panic("msdosfs_mkdir: no name"); 1373 #endif 1374 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1375 if (error) 1376 goto bad; 1377 1378 ndirent.de_Attributes = ATTR_DIRECTORY; 1379 ndirent.de_LowerCase = 0; 1380 ndirent.de_StartCluster = newcluster; 1381 ndirent.de_FileSize = 0; 1382 ndirent.de_dev = pdep->de_dev; 1383 ndirent.de_devvp = pdep->de_devvp; 1384 error = createde(&ndirent, pdep, &dep, cnp); 1385 if (error) 1386 goto bad; 1387 *ap->a_vpp = DETOV(dep); 1388 return (0); 1389 1390 bad: 1391 clusterfree(pmp, newcluster, NULL); 1392 bad2: 1393 return (error); 1394 } 1395 1396 static int 1397 msdosfs_rmdir(ap) 1398 struct vop_rmdir_args /* { 1399 struct vnode *a_dvp; 1400 struct vnode *a_vp; 1401 struct componentname *a_cnp; 1402 } */ *ap; 1403 { 1404 register struct vnode *vp = ap->a_vp; 1405 register struct vnode *dvp = ap->a_dvp; 1406 register struct componentname *cnp = ap->a_cnp; 1407 register struct denode *ip, *dp; 1408 struct proc *p = cnp->cn_proc; 1409 int error; 1410 1411 ip = VTODE(vp); 1412 dp = VTODE(dvp); 1413 1414 /* 1415 * Verify the directory is empty (and valid). 1416 * (Rmdir ".." won't be valid since 1417 * ".." will contain a reference to 1418 * the current directory and thus be 1419 * non-empty.) 1420 */ 1421 error = 0; 1422 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1423 error = ENOTEMPTY; 1424 goto out; 1425 } 1426 /* 1427 * Delete the entry from the directory. For dos filesystems this 1428 * gets rid of the directory entry on disk, the in memory copy 1429 * still exists but the de_refcnt is <= 0. This prevents it from 1430 * being found by deget(). When the vput() on dep is done we give 1431 * up access and eventually msdosfs_reclaim() will be called which 1432 * will remove it from the denode cache. 1433 */ 1434 error = removede(dp, ip); 1435 if (error) 1436 goto out; 1437 /* 1438 * This is where we decrement the link count in the parent 1439 * directory. Since dos filesystems don't do this we just purge 1440 * the name cache. 1441 */ 1442 cache_purge(dvp); 1443 VOP_UNLOCK(dvp, 0, p); 1444 /* 1445 * Truncate the directory that is being deleted. 1446 */ 1447 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, p); 1448 cache_purge(vp); 1449 1450 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, p); 1451 out: 1452 return (error); 1453 } 1454 1455 /* 1456 * DOS filesystems don't know what symlinks are. 1457 */ 1458 static int 1459 msdosfs_symlink(ap) 1460 struct vop_symlink_args /* { 1461 struct vnode *a_dvp; 1462 struct vnode **a_vpp; 1463 struct componentname *a_cnp; 1464 struct vattr *a_vap; 1465 char *a_target; 1466 } */ *ap; 1467 { 1468 return (EOPNOTSUPP); 1469 } 1470 1471 static int 1472 msdosfs_readdir(ap) 1473 struct vop_readdir_args /* { 1474 struct vnode *a_vp; 1475 struct uio *a_uio; 1476 struct ucred *a_cred; 1477 int *a_eofflag; 1478 int *a_ncookies; 1479 u_long **a_cookies; 1480 } */ *ap; 1481 { 1482 int error = 0; 1483 int diff; 1484 long n; 1485 int blsize; 1486 long on; 1487 u_long cn; 1488 u_long fileno; 1489 u_long dirsperblk; 1490 long bias = 0; 1491 daddr_t bn, lbn; 1492 struct buf *bp; 1493 struct denode *dep = VTODE(ap->a_vp); 1494 struct msdosfsmount *pmp = dep->de_pmp; 1495 struct direntry *dentp; 1496 struct dirent dirbuf; 1497 struct uio *uio = ap->a_uio; 1498 u_long *cookies = NULL; 1499 int ncookies = 0; 1500 off_t offset, off; 1501 int chksum = -1; 1502 1503 #ifdef MSDOSFS_DEBUG 1504 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1505 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1506 #endif 1507 1508 /* 1509 * msdosfs_readdir() won't operate properly on regular files since 1510 * it does i/o only with the the filesystem vnode, and hence can 1511 * retrieve the wrong block from the buffer cache for a plain file. 1512 * So, fail attempts to readdir() on a plain file. 1513 */ 1514 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1515 return (ENOTDIR); 1516 1517 /* 1518 * To be safe, initialize dirbuf 1519 */ 1520 bzero(dirbuf.d_name, sizeof(dirbuf.d_name)); 1521 1522 /* 1523 * If the user buffer is smaller than the size of one dos directory 1524 * entry or the file offset is not a multiple of the size of a 1525 * directory entry, then we fail the read. 1526 */ 1527 off = offset = uio->uio_offset; 1528 if (uio->uio_resid < sizeof(struct direntry) || 1529 (offset & (sizeof(struct direntry) - 1))) 1530 return (EINVAL); 1531 1532 if (ap->a_ncookies) { 1533 ncookies = uio->uio_resid / 16; 1534 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP, 1535 M_WAITOK); 1536 *ap->a_cookies = cookies; 1537 *ap->a_ncookies = ncookies; 1538 } 1539 1540 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1541 1542 /* 1543 * If they are reading from the root directory then, we simulate 1544 * the . and .. entries since these don't exist in the root 1545 * directory. We also set the offset bias to make up for having to 1546 * simulate these entries. By this I mean that at file offset 64 we 1547 * read the first entry in the root directory that lives on disk. 1548 */ 1549 if (dep->de_StartCluster == MSDOSFSROOT 1550 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1551 #if 0 1552 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1553 offset); 1554 #endif 1555 bias = 2 * sizeof(struct direntry); 1556 if (offset < bias) { 1557 for (n = (int)offset / sizeof(struct direntry); 1558 n < 2; n++) { 1559 if (FAT32(pmp)) 1560 dirbuf.d_fileno = cntobn(pmp, 1561 pmp->pm_rootdirblk) 1562 * dirsperblk; 1563 else 1564 dirbuf.d_fileno = 1; 1565 dirbuf.d_type = DT_DIR; 1566 switch (n) { 1567 case 0: 1568 dirbuf.d_namlen = 1; 1569 strcpy(dirbuf.d_name, "."); 1570 break; 1571 case 1: 1572 dirbuf.d_namlen = 2; 1573 strcpy(dirbuf.d_name, ".."); 1574 break; 1575 } 1576 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1577 if (uio->uio_resid < dirbuf.d_reclen) 1578 goto out; 1579 error = uiomove((caddr_t) &dirbuf, 1580 dirbuf.d_reclen, uio); 1581 if (error) 1582 goto out; 1583 offset += sizeof(struct direntry); 1584 off = offset; 1585 if (cookies) { 1586 *cookies++ = offset; 1587 if (--ncookies <= 0) 1588 goto out; 1589 } 1590 } 1591 } 1592 } 1593 1594 off = offset; 1595 while (uio->uio_resid > 0) { 1596 lbn = de_cluster(pmp, offset - bias); 1597 on = (offset - bias) & pmp->pm_crbomask; 1598 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1599 diff = dep->de_FileSize - (offset - bias); 1600 if (diff <= 0) 1601 break; 1602 n = min(n, diff); 1603 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1604 if (error) 1605 break; 1606 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1607 if (error) { 1608 brelse(bp); 1609 return (error); 1610 } 1611 n = min(n, blsize - bp->b_resid); 1612 1613 /* 1614 * Convert from dos directory entries to fs-independent 1615 * directory entries. 1616 */ 1617 for (dentp = (struct direntry *)(bp->b_data + on); 1618 (char *)dentp < bp->b_data + on + n; 1619 dentp++, offset += sizeof(struct direntry)) { 1620 #if 0 1621 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1622 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1623 #endif 1624 /* 1625 * If this is an unused entry, we can stop. 1626 */ 1627 if (dentp->deName[0] == SLOT_EMPTY) { 1628 brelse(bp); 1629 goto out; 1630 } 1631 /* 1632 * Skip deleted entries. 1633 */ 1634 if (dentp->deName[0] == SLOT_DELETED) { 1635 chksum = -1; 1636 continue; 1637 } 1638 1639 /* 1640 * Handle Win95 long directory entries 1641 */ 1642 if (dentp->deAttributes == ATTR_WIN95) { 1643 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1644 continue; 1645 chksum = win2unixfn((struct winentry *)dentp, 1646 &dirbuf, chksum, 1647 pmp->pm_flags & MSDOSFSMNT_U2WTABLE, 1648 pmp->pm_u2w); 1649 continue; 1650 } 1651 1652 /* 1653 * Skip volume labels 1654 */ 1655 if (dentp->deAttributes & ATTR_VOLUME) { 1656 chksum = -1; 1657 continue; 1658 } 1659 /* 1660 * This computation of d_fileno must match 1661 * the computation of va_fileid in 1662 * msdosfs_getattr. 1663 */ 1664 if (dentp->deAttributes & ATTR_DIRECTORY) { 1665 fileno = getushort(dentp->deStartCluster); 1666 if (FAT32(pmp)) 1667 fileno |= getushort(dentp->deHighClust) << 16; 1668 /* if this is the root directory */ 1669 if (fileno == MSDOSFSROOT) 1670 if (FAT32(pmp)) 1671 fileno = cntobn(pmp, 1672 pmp->pm_rootdirblk) 1673 * dirsperblk; 1674 else 1675 fileno = 1; 1676 else 1677 fileno = cntobn(pmp, fileno) * dirsperblk; 1678 dirbuf.d_fileno = fileno; 1679 dirbuf.d_type = DT_DIR; 1680 } else { 1681 dirbuf.d_fileno = offset / sizeof(struct direntry); 1682 dirbuf.d_type = DT_REG; 1683 } 1684 if (chksum != winChksum(dentp->deName)) 1685 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1686 (u_char *)dirbuf.d_name, 1687 dentp->deLowerCase | 1688 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1689 (LCASE_BASE | LCASE_EXT) : 0), 1690 pmp->pm_flags & MSDOSFSMNT_U2WTABLE, 1691 pmp->pm_d2u, 1692 pmp->pm_flags & MSDOSFSMNT_ULTABLE, 1693 pmp->pm_ul); 1694 else 1695 dirbuf.d_name[dirbuf.d_namlen] = 0; 1696 chksum = -1; 1697 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1698 if (uio->uio_resid < dirbuf.d_reclen) { 1699 brelse(bp); 1700 goto out; 1701 } 1702 error = uiomove((caddr_t) &dirbuf, 1703 dirbuf.d_reclen, uio); 1704 if (error) { 1705 brelse(bp); 1706 goto out; 1707 } 1708 if (cookies) { 1709 *cookies++ = offset + sizeof(struct direntry); 1710 if (--ncookies <= 0) { 1711 brelse(bp); 1712 goto out; 1713 } 1714 } 1715 off = offset + sizeof(struct direntry); 1716 } 1717 brelse(bp); 1718 } 1719 out: 1720 /* Subtract unused cookies */ 1721 if (ap->a_ncookies) 1722 *ap->a_ncookies -= ncookies; 1723 1724 uio->uio_offset = off; 1725 1726 /* 1727 * Set the eofflag (NFS uses it) 1728 */ 1729 if (ap->a_eofflag) { 1730 if (dep->de_FileSize - (offset - bias) <= 0) 1731 *ap->a_eofflag = 1; 1732 else 1733 *ap->a_eofflag = 0; 1734 } 1735 return (error); 1736 } 1737 1738 /* 1739 * vp - address of vnode file the file 1740 * bn - which cluster we are interested in mapping to a filesystem block number. 1741 * vpp - returns the vnode for the block special file holding the filesystem 1742 * containing the file of interest 1743 * bnp - address of where to return the filesystem relative block number 1744 */ 1745 static int 1746 msdosfs_bmap(ap) 1747 struct vop_bmap_args /* { 1748 struct vnode *a_vp; 1749 daddr_t a_bn; 1750 struct vnode **a_vpp; 1751 daddr_t *a_bnp; 1752 int *a_runp; 1753 int *a_runb; 1754 } */ *ap; 1755 { 1756 struct denode *dep = VTODE(ap->a_vp); 1757 1758 if (ap->a_vpp != NULL) 1759 *ap->a_vpp = dep->de_devvp; 1760 if (ap->a_bnp == NULL) 1761 return (0); 1762 if (ap->a_runp) { 1763 /* 1764 * Sequential clusters should be counted here. 1765 */ 1766 *ap->a_runp = 0; 1767 } 1768 if (ap->a_runb) { 1769 *ap->a_runb = 0; 1770 } 1771 return (pcbmap(dep, ap->a_bn, ap->a_bnp, 0, 0)); 1772 } 1773 1774 static int 1775 msdosfs_strategy(ap) 1776 struct vop_strategy_args /* { 1777 struct vnode *a_vp; 1778 struct buf *a_bp; 1779 } */ *ap; 1780 { 1781 struct buf *bp = ap->a_bp; 1782 struct denode *dep = VTODE(bp->b_vp); 1783 struct vnode *vp; 1784 int error = 0; 1785 1786 if (bp->b_vp->v_type == VBLK || bp->b_vp->v_type == VCHR) 1787 panic("msdosfs_strategy: spec"); 1788 /* 1789 * If we don't already know the filesystem relative block number 1790 * then get it using pcbmap(). If pcbmap() returns the block 1791 * number as -1 then we've got a hole in the file. DOS filesystems 1792 * don't allow files with holes, so we shouldn't ever see this. 1793 */ 1794 if (bp->b_blkno == bp->b_lblkno) { 1795 error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno, 0, 0); 1796 if (error) { 1797 bp->b_error = error; 1798 bp->b_ioflags |= BIO_ERROR; 1799 bufdone(bp); 1800 return (error); 1801 } 1802 if ((long)bp->b_blkno == -1) 1803 vfs_bio_clrbuf(bp); 1804 } 1805 if (bp->b_blkno == -1) { 1806 bufdone(bp); 1807 return (0); 1808 } 1809 /* 1810 * Read/write the block from/to the disk that contains the desired 1811 * file block. 1812 */ 1813 vp = dep->de_devvp; 1814 bp->b_dev = vp->v_rdev; 1815 VOP_STRATEGY(vp, bp); 1816 return (0); 1817 } 1818 1819 static int 1820 msdosfs_print(ap) 1821 struct vop_print_args /* { 1822 struct vnode *vp; 1823 } */ *ap; 1824 { 1825 struct denode *dep = VTODE(ap->a_vp); 1826 1827 printf( 1828 "tag VT_MSDOSFS, startcluster %lu, dircluster %lu, diroffset %lu ", 1829 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1830 printf(" dev %d, %d", major(dep->de_dev), minor(dep->de_dev)); 1831 lockmgr_printinfo(&ap->a_vp->v_lock); 1832 printf("\n"); 1833 return (0); 1834 } 1835 1836 static int 1837 msdosfs_pathconf(ap) 1838 struct vop_pathconf_args /* { 1839 struct vnode *a_vp; 1840 int a_name; 1841 int *a_retval; 1842 } */ *ap; 1843 { 1844 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1845 1846 switch (ap->a_name) { 1847 case _PC_LINK_MAX: 1848 *ap->a_retval = 1; 1849 return (0); 1850 case _PC_NAME_MAX: 1851 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1852 return (0); 1853 case _PC_PATH_MAX: 1854 *ap->a_retval = PATH_MAX; 1855 return (0); 1856 case _PC_CHOWN_RESTRICTED: 1857 *ap->a_retval = 1; 1858 return (0); 1859 case _PC_NO_TRUNC: 1860 *ap->a_retval = 0; 1861 return (0); 1862 default: 1863 return (EINVAL); 1864 } 1865 /* NOTREACHED */ 1866 } 1867 1868 /* 1869 * get page routine 1870 * 1871 * XXX By default, wimp out... note that a_offset is ignored (and always 1872 * XXX has been). 1873 */ 1874 int 1875 msdosfs_getpages(ap) 1876 struct vop_getpages_args *ap; 1877 { 1878 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count, 1879 ap->a_reqpage); 1880 } 1881 1882 /* 1883 * put page routine 1884 * 1885 * XXX By default, wimp out... note that a_offset is ignored (and always 1886 * XXX has been). 1887 */ 1888 int 1889 msdosfs_putpages(ap) 1890 struct vop_putpages_args *ap; 1891 { 1892 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 1893 ap->a_sync, ap->a_rtvals); 1894 } 1895 1896 /* Global vfs data structures for msdosfs */ 1897 vop_t **msdosfs_vnodeop_p; 1898 static struct vnodeopv_entry_desc msdosfs_vnodeop_entries[] = { 1899 { &vop_default_desc, (vop_t *) vop_defaultop }, 1900 { &vop_access_desc, (vop_t *) msdosfs_access }, 1901 { &vop_bmap_desc, (vop_t *) msdosfs_bmap }, 1902 { &vop_cachedlookup_desc, (vop_t *) msdosfs_lookup }, 1903 { &vop_close_desc, (vop_t *) msdosfs_close }, 1904 { &vop_create_desc, (vop_t *) msdosfs_create }, 1905 { &vop_fsync_desc, (vop_t *) msdosfs_fsync }, 1906 { &vop_getattr_desc, (vop_t *) msdosfs_getattr }, 1907 { &vop_inactive_desc, (vop_t *) msdosfs_inactive }, 1908 { &vop_islocked_desc, (vop_t *) vop_stdislocked }, 1909 { &vop_link_desc, (vop_t *) msdosfs_link }, 1910 { &vop_lock_desc, (vop_t *) vop_stdlock }, 1911 { &vop_lookup_desc, (vop_t *) vfs_cache_lookup }, 1912 { &vop_mkdir_desc, (vop_t *) msdosfs_mkdir }, 1913 { &vop_mknod_desc, (vop_t *) msdosfs_mknod }, 1914 { &vop_pathconf_desc, (vop_t *) msdosfs_pathconf }, 1915 { &vop_print_desc, (vop_t *) msdosfs_print }, 1916 { &vop_read_desc, (vop_t *) msdosfs_read }, 1917 { &vop_readdir_desc, (vop_t *) msdosfs_readdir }, 1918 { &vop_reclaim_desc, (vop_t *) msdosfs_reclaim }, 1919 { &vop_remove_desc, (vop_t *) msdosfs_remove }, 1920 { &vop_rename_desc, (vop_t *) msdosfs_rename }, 1921 { &vop_rmdir_desc, (vop_t *) msdosfs_rmdir }, 1922 { &vop_setattr_desc, (vop_t *) msdosfs_setattr }, 1923 { &vop_strategy_desc, (vop_t *) msdosfs_strategy }, 1924 { &vop_symlink_desc, (vop_t *) msdosfs_symlink }, 1925 { &vop_unlock_desc, (vop_t *) vop_stdunlock }, 1926 { &vop_write_desc, (vop_t *) msdosfs_write }, 1927 { &vop_getpages_desc, (vop_t *) msdosfs_getpages }, 1928 { &vop_putpages_desc, (vop_t *) msdosfs_putpages }, 1929 { NULL, NULL } 1930 }; 1931 static struct vnodeopv_desc msdosfs_vnodeop_opv_desc = 1932 { &msdosfs_vnodeop_p, msdosfs_vnodeop_entries }; 1933 1934 VNODEOP_SET(msdosfs_vnodeop_opv_desc); 1935