1 /* $FreeBSD: src/sys/msdosfs/msdosfs_vnops.c,v 1.95.2.4 2003/06/13 15:05:47 trhodes Exp $ */ 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/resourcevar.h> /* defines plimit structure in proc struct */ 54 #include <sys/kernel.h> 55 #include <sys/stat.h> 56 #include <sys/buf.h> 57 #include <sys/proc.h> 58 #include <sys/priv.h> 59 #include <sys/namei.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/vm_zone.h> 70 #include <vm/vnode_pager.h> 71 72 #include <sys/buf2.h> 73 74 #include <machine/inttypes.h> 75 76 #include "bpb.h" 77 #include "direntry.h" 78 #include "denode.h" 79 #include "msdosfsmount.h" 80 #include "fat.h" 81 82 #define DOS_FILESIZE_MAX 0xffffffff 83 84 /* 85 * Prototypes for MSDOSFS vnode operations 86 */ 87 static int msdosfs_create (struct vop_old_create_args *); 88 static int msdosfs_mknod (struct vop_old_mknod_args *); 89 static int msdosfs_open (struct vop_open_args *); 90 static int msdosfs_close (struct vop_close_args *); 91 static int msdosfs_access (struct vop_access_args *); 92 static int msdosfs_getattr (struct vop_getattr_args *); 93 static int msdosfs_setattr (struct vop_setattr_args *); 94 static int msdosfs_read (struct vop_read_args *); 95 static int msdosfs_write (struct vop_write_args *); 96 static int msdosfs_fsync (struct vop_fsync_args *); 97 static int msdosfs_remove (struct vop_old_remove_args *); 98 static int msdosfs_link (struct vop_old_link_args *); 99 static int msdosfs_rename (struct vop_old_rename_args *); 100 static int msdosfs_mkdir (struct vop_old_mkdir_args *); 101 static int msdosfs_rmdir (struct vop_old_rmdir_args *); 102 static int msdosfs_symlink (struct vop_old_symlink_args *); 103 static int msdosfs_readdir (struct vop_readdir_args *); 104 static int msdosfs_bmap (struct vop_bmap_args *); 105 static int msdosfs_strategy (struct vop_strategy_args *); 106 static int msdosfs_print (struct vop_print_args *); 107 static int msdosfs_pathconf (struct vop_pathconf_args *ap); 108 109 /* 110 * Some general notes: 111 * 112 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 113 * read/written using the vnode for the filesystem. Blocks that represent 114 * the contents of a file are read/written using the vnode for the file 115 * (including directories when they are read/written as files). This 116 * presents problems for the dos filesystem because data that should be in 117 * an inode (if dos had them) resides in the directory itself. Since we 118 * must update directory entries without the benefit of having the vnode 119 * for the directory we must use the vnode for the filesystem. This means 120 * that when a directory is actually read/written (via read, write, or 121 * readdir, or seek) we must use the vnode for the filesystem instead of 122 * the vnode for the directory as would happen in ufs. This is to insure we 123 * retreive the correct block from the buffer cache since the hash value is 124 * based upon the vnode address and the desired block number. 125 */ 126 127 /* 128 * Create a regular file. On entry the directory to contain the file being 129 * created is locked. We must release before we return. 130 * 131 * msdosfs_create(struct vnode *a_dvp, struct vnode **a_vpp, 132 * struct componentname *a_cnp, struct vattr *a_vap) 133 */ 134 static int 135 msdosfs_create(struct vop_old_create_args *ap) 136 { 137 struct componentname *cnp = ap->a_cnp; 138 struct denode ndirent; 139 struct denode *dep; 140 struct denode *pdep = VTODE(ap->a_dvp); 141 struct timespec ts; 142 int error; 143 144 #ifdef MSDOSFS_DEBUG 145 kprintf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 146 #endif 147 148 /* 149 * If this is the root directory and there is no space left we 150 * can't do anything. This is because the root directory can not 151 * change size. 152 */ 153 if (pdep->de_StartCluster == MSDOSFSROOT 154 && pdep->de_fndoffset >= pdep->de_FileSize) { 155 error = ENOSPC; 156 goto bad; 157 } 158 159 /* 160 * Create a directory entry for the file, then call createde() to 161 * have it installed. NOTE: DOS files are always executable. We 162 * use the absence of the owner write bit to make the file 163 * readonly. 164 */ 165 bzero(&ndirent, sizeof(ndirent)); 166 error = uniqdosname(pdep, cnp, ndirent.de_Name); 167 if (error) 168 goto bad; 169 170 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ? 171 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; 172 ndirent.de_LowerCase = 0; 173 ndirent.de_StartCluster = 0; 174 ndirent.de_FileSize = 0; 175 ndirent.de_dev = pdep->de_dev; 176 ndirent.de_devvp = pdep->de_devvp; 177 ndirent.de_pmp = pdep->de_pmp; 178 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 179 getnanotime(&ts); 180 DETIMES(&ndirent, &ts, &ts, &ts); 181 error = createde(&ndirent, pdep, &dep, cnp); 182 if (error) 183 goto bad; 184 *ap->a_vpp = DETOV(dep); 185 return (0); 186 187 bad: 188 return (error); 189 } 190 191 /* 192 * msdosfs_mknod(struct vnode *a_dvp, struct vnode **a_vpp, 193 * struct componentname *a_cnp, struct vattr *a_vap) 194 */ 195 static int 196 msdosfs_mknod(struct vop_old_mknod_args *ap) 197 { 198 switch (ap->a_vap->va_type) { 199 case VDIR: 200 return (msdosfs_mkdir((struct vop_old_mkdir_args *)ap)); 201 break; 202 203 case VREG: 204 return (msdosfs_create((struct vop_old_create_args *)ap)); 205 break; 206 207 default: 208 return (EINVAL); 209 } 210 /* NOTREACHED */ 211 } 212 213 /* 214 * msdosfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred, 215 * struct file *a_fp) 216 */ 217 static int 218 msdosfs_open(struct vop_open_args *ap) 219 { 220 return(vop_stdopen(ap)); 221 } 222 223 /* 224 * msdosfs_close(struct vnode *a_vp, int a_fflag) 225 */ 226 static int 227 msdosfs_close(struct vop_close_args *ap) 228 { 229 struct vnode *vp = ap->a_vp; 230 struct denode *dep = VTODE(vp); 231 struct timespec ts; 232 233 if (vp->v_sysref.refcnt > 1) { 234 getnanotime(&ts); 235 DETIMES(dep, &ts, &ts, &ts); 236 } 237 return (vop_stdclose(ap)); 238 } 239 240 /* 241 * msdosfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred) 242 */ 243 static int 244 msdosfs_access(struct vop_access_args *ap) 245 { 246 struct denode *dep = VTODE(ap->a_vp); 247 struct msdosfsmount *pmp = dep->de_pmp; 248 mode_t file_mode; 249 250 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) | 251 ((dep->de_Attributes & ATTR_READONLY) ? 252 0 : (S_IWUSR|S_IWGRP|S_IWOTH)); 253 file_mode &= pmp->pm_mask; 254 255 return (vop_helper_access(ap, pmp->pm_uid, pmp->pm_gid, file_mode, 0)); 256 } 257 258 /* 259 * msdosfs_getattr(struct vnode *a_vp, struct vattr *a_vap) 260 */ 261 static int 262 msdosfs_getattr(struct vop_getattr_args *ap) 263 { 264 struct denode *dep = VTODE(ap->a_vp); 265 struct msdosfsmount *pmp = dep->de_pmp; 266 struct vattr *vap = ap->a_vap; 267 mode_t mode; 268 struct timespec ts; 269 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 270 u_long fileid; 271 272 getnanotime(&ts); 273 DETIMES(dep, &ts, &ts, &ts); 274 vap->va_fsid = dev2udev(dep->de_dev); 275 /* 276 * The following computation of the fileid must be the same as that 277 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 278 * doesn't work. 279 */ 280 if (dep->de_Attributes & ATTR_DIRECTORY) { 281 fileid = xcntobn(pmp, dep->de_StartCluster) * dirsperblk; 282 if (dep->de_StartCluster == MSDOSFSROOT) 283 fileid = 1; 284 } else { 285 fileid = xcntobn(pmp, dep->de_dirclust) * dirsperblk; 286 if (dep->de_dirclust == MSDOSFSROOT) 287 fileid = roottobn(pmp, 0) * dirsperblk; 288 fileid += dep->de_diroffset / sizeof(struct direntry); 289 } 290 vap->va_fileid = fileid; 291 if ((dep->de_Attributes & ATTR_READONLY) == 0) 292 mode = S_IRWXU|S_IRWXG|S_IRWXO; 293 else 294 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 295 vap->va_mode = mode & pmp->pm_mask; 296 vap->va_uid = pmp->pm_uid; 297 vap->va_gid = pmp->pm_gid; 298 vap->va_nlink = 1; 299 vap->va_rmajor = VNOVAL; 300 vap->va_rminor = VNOVAL; 301 vap->va_size = dep->de_FileSize; 302 dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime); 303 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 304 dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime); 305 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, &vap->va_ctime); 306 } else { 307 vap->va_atime = vap->va_mtime; 308 vap->va_ctime = vap->va_mtime; 309 } 310 vap->va_flags = 0; 311 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) 312 vap->va_flags |= SF_ARCHIVED; 313 vap->va_gen = 0; 314 vap->va_blocksize = pmp->pm_bpcluster; 315 vap->va_bytes = 316 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 317 vap->va_type = ap->a_vp->v_type; 318 vap->va_filerev = dep->de_modrev; 319 return (0); 320 } 321 322 /* 323 * msdosfs_setattr(struct vnode *a_vp, struct vattr *a_vap, 324 * struct ucred *a_cred) 325 */ 326 static int 327 msdosfs_setattr(struct vop_setattr_args *ap) 328 { 329 struct vnode *vp = ap->a_vp; 330 struct denode *dep = VTODE(ap->a_vp); 331 struct msdosfsmount *pmp = dep->de_pmp; 332 struct vattr *vap = ap->a_vap; 333 struct ucred *cred = ap->a_cred; 334 int error = 0; 335 336 #ifdef MSDOSFS_DEBUG 337 kprintf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", 338 ap->a_vp, vap, cred); 339 #endif 340 341 /* 342 * Check for unsettable attributes. 343 */ 344 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 345 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 346 (vap->va_blocksize != VNOVAL) || (vap->va_rmajor != VNOVAL) || 347 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 348 #ifdef MSDOSFS_DEBUG 349 kprintf("msdosfs_setattr(): returning EINVAL\n"); 350 kprintf(" va_type %u, va_nlink %"PRIx64", va_fsid %x, va_fileid %"PRIx64"\n", 351 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 352 kprintf(" va_blocksize %lx, va_rmajor %x, va_bytes %"PRIx64", va_gen %"PRIx64"\n", 353 vap->va_blocksize, vap->va_rmajor, vap->va_bytes, vap->va_gen); 354 kprintf(" va_uid %x, va_gid %x\n", 355 vap->va_uid, vap->va_gid); 356 #endif 357 return (EINVAL); 358 } 359 if (vap->va_flags != VNOVAL) { 360 if (vp->v_mount->mnt_flag & MNT_RDONLY) 361 return (EROFS); 362 if (cred->cr_uid != pmp->pm_uid && 363 (error = priv_check_cred(cred, PRIV_VFS_SETATTR, 0))) 364 return (error); 365 /* 366 * We are very inconsistent about handling unsupported 367 * attributes. We ignored the access time and the 368 * read and execute bits. We were strict for the other 369 * attributes. 370 * 371 * Here we are strict, stricter than ufs in not allowing 372 * users to attempt to set SF_SETTABLE bits or anyone to 373 * set unsupported bits. However, we ignore attempts to 374 * set ATTR_ARCHIVE for directories `cp -pr' from a more 375 * sensible file system attempts it a lot. 376 */ 377 if (cred->cr_uid != 0) { 378 if (vap->va_flags & SF_SETTABLE) 379 return EPERM; 380 } 381 if (vap->va_flags & ~SF_ARCHIVED) 382 return EOPNOTSUPP; 383 if (vap->va_flags & SF_ARCHIVED) 384 dep->de_Attributes &= ~ATTR_ARCHIVE; 385 else if (!(dep->de_Attributes & ATTR_DIRECTORY)) 386 dep->de_Attributes |= ATTR_ARCHIVE; 387 dep->de_flag |= DE_MODIFIED; 388 } 389 390 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 391 uid_t uid; 392 gid_t gid; 393 394 if (vp->v_mount->mnt_flag & MNT_RDONLY) 395 return (EROFS); 396 uid = vap->va_uid; 397 if (uid == (uid_t)VNOVAL) 398 uid = pmp->pm_uid; 399 gid = vap->va_gid; 400 if (gid == (gid_t)VNOVAL) 401 gid = pmp->pm_gid; 402 if ((cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 403 (gid != pmp->pm_gid && !groupmember(gid, cred))) && 404 (error = priv_check_cred(cred, PRIV_VFS_SETATTR, 0))) 405 return error; 406 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 407 return EINVAL; 408 } 409 410 if (vap->va_size != VNOVAL) { 411 /* 412 * Disallow write attempts on read-only file systems; 413 * unless the file is a socket, fifo, or a block or 414 * character device resident on the file system. 415 */ 416 switch (vp->v_type) { 417 case VDIR: 418 return (EISDIR); 419 /* NOT REACHED */ 420 case VLNK: 421 case VREG: 422 if (vp->v_mount->mnt_flag & MNT_RDONLY) 423 return (EROFS); 424 break; 425 default: 426 break; 427 } 428 error = detrunc(dep, vap->va_size, 0); 429 if (error) 430 return error; 431 } 432 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 433 if (vp->v_mount->mnt_flag & MNT_RDONLY) 434 return (EROFS); 435 if (cred->cr_uid != pmp->pm_uid && 436 (error = priv_check_cred(cred, PRIV_VFS_SETATTR, 0)) && 437 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 438 (error = VOP_EACCESS(ap->a_vp, VWRITE, cred)))) 439 return (error); 440 if (vp->v_type != VDIR) { 441 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 442 vap->va_atime.tv_sec != VNOVAL) { 443 dep->de_flag &= ~DE_ACCESS; 444 unix2dostime(&vap->va_atime, &dep->de_ADate, 445 NULL, NULL); 446 } 447 if (vap->va_mtime.tv_sec != VNOVAL) { 448 dep->de_flag &= ~DE_UPDATE; 449 unix2dostime(&vap->va_mtime, &dep->de_MDate, 450 &dep->de_MTime, NULL); 451 } 452 dep->de_Attributes |= ATTR_ARCHIVE; 453 dep->de_flag |= DE_MODIFIED; 454 } 455 } 456 /* 457 * DOS files only have the ability to have their writability 458 * attribute set, so we use the owner write bit to set the readonly 459 * attribute. 460 */ 461 if (vap->va_mode != (mode_t)VNOVAL) { 462 if (vp->v_mount->mnt_flag & MNT_RDONLY) 463 return (EROFS); 464 if (cred->cr_uid != pmp->pm_uid && 465 (error = priv_check_cred(cred, PRIV_VFS_SETATTR, 0))) 466 return (error); 467 if (vp->v_type != VDIR) { 468 /* We ignore the read and execute bits. */ 469 if (vap->va_mode & VWRITE) 470 dep->de_Attributes &= ~ATTR_READONLY; 471 else 472 dep->de_Attributes |= ATTR_READONLY; 473 dep->de_Attributes |= ATTR_ARCHIVE; 474 dep->de_flag |= DE_MODIFIED; 475 } 476 } 477 return (deupdat(dep, 1)); 478 } 479 480 /* 481 * msdosfs_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 482 * struct ucred *a_cred) 483 */ 484 static int 485 msdosfs_read(struct vop_read_args *ap) 486 { 487 int error = 0; 488 int blsize; 489 int isadir; 490 size_t orig_resid; 491 u_int n; 492 u_long diff; 493 u_long on; 494 daddr_t lbn; 495 daddr_t rablock; 496 off_t raoffset; 497 off_t loffset; 498 int rasize; 499 int seqcount; 500 struct buf *bp; 501 struct vnode *vp = ap->a_vp; 502 struct denode *dep = VTODE(vp); 503 struct msdosfsmount *pmp = dep->de_pmp; 504 struct uio *uio = ap->a_uio; 505 506 if (uio->uio_offset < 0) 507 return (EINVAL); 508 509 if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX) 510 return (0); 511 /* 512 * If they didn't ask for any data, then we are done. 513 */ 514 orig_resid = uio->uio_resid; 515 if (orig_resid == 0) 516 return (0); 517 518 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 519 520 isadir = dep->de_Attributes & ATTR_DIRECTORY; 521 do { 522 if (uio->uio_offset >= dep->de_FileSize) 523 break; 524 525 /* 526 * note: lbn is a cluster number, not a device block number. 527 */ 528 lbn = de_off2cn(pmp, uio->uio_offset); 529 loffset = de_cn2doff(pmp, lbn); 530 531 /* 532 * If we are operating on a directory file then be sure to 533 * do i/o with the vnode for the filesystem instead of the 534 * vnode for the directory. 535 */ 536 if (isadir) { 537 /* 538 * convert cluster # to block #. lbn is a 539 * device block number after this. 540 */ 541 error = pcbmap(dep, lbn, &lbn, NULL, &blsize); 542 loffset = de_bntodoff(pmp, lbn); 543 if (error == E2BIG) { 544 error = EINVAL; 545 break; 546 } else if (error) 547 break; 548 error = bread(pmp->pm_devvp, loffset, blsize, &bp); 549 } else { 550 blsize = pmp->pm_bpcluster; 551 rablock = lbn + 1; 552 raoffset = de_cn2doff(pmp, rablock); 553 if (seqcount > 1 && 554 raoffset < dep->de_FileSize) { 555 rasize = pmp->pm_bpcluster; 556 error = breadn(vp, loffset, blsize, 557 &raoffset, &rasize, 1, &bp); 558 } else { 559 error = bread(vp, loffset, blsize, &bp); 560 } 561 } 562 if (error) { 563 brelse(bp); 564 break; 565 } 566 on = uio->uio_offset & pmp->pm_crbomask; 567 diff = pmp->pm_bpcluster - on; 568 n = szmin(uio->uio_resid, diff); 569 diff = dep->de_FileSize - uio->uio_offset; 570 if (diff < n) 571 n = diff; 572 diff = blsize - bp->b_resid; 573 if (diff < n) 574 n = diff; 575 error = uiomovebp(bp, bp->b_data + on, (size_t)n, uio); 576 brelse(bp); 577 } while (error == 0 && uio->uio_resid > 0 && n != 0); 578 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 579 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 580 dep->de_flag |= DE_ACCESS; 581 return (error); 582 } 583 584 /* 585 * Write data to a file or directory. 586 * 587 * msdosfs_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 588 * struct ucred *a_cred) 589 */ 590 static int 591 msdosfs_write(struct vop_write_args *ap) 592 { 593 int n; 594 int croffset; 595 size_t resid; 596 u_long osize; 597 int error = 0; 598 u_long count; 599 daddr_t cn, lastcn; 600 struct buf *bp; 601 int ioflag = ap->a_ioflag; 602 struct uio *uio = ap->a_uio; 603 struct thread *td = uio->uio_td; 604 struct vnode *vp = ap->a_vp; 605 struct vnode *thisvp; 606 struct denode *dep = VTODE(vp); 607 struct msdosfsmount *pmp = dep->de_pmp; 608 struct proc *p = (td ? td->td_proc : NULL); 609 struct lwp *lp = (td ? td->td_lwp : NULL); 610 611 #ifdef MSDOSFS_DEBUG 612 kprintf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 613 vp, uio, ioflag, ap->a_cred); 614 kprintf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 615 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 616 #endif 617 618 switch (vp->v_type) { 619 case VREG: 620 if (ioflag & IO_APPEND) 621 uio->uio_offset = dep->de_FileSize; 622 thisvp = vp; 623 break; 624 case VDIR: 625 return EISDIR; 626 default: 627 panic("msdosfs_write(): bad file type"); 628 } 629 630 if (uio->uio_offset < 0) 631 return (EFBIG); 632 633 if (uio->uio_resid == 0) 634 return (0); 635 636 /* 637 * If they've exceeded their filesize limit, tell them about it. 638 */ 639 if (p && 640 ((uoff_t)uio->uio_offset + uio->uio_resid > 641 p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) { 642 lwpsignal(p, lp, SIGXFSZ); 643 return (EFBIG); 644 } 645 646 if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX) 647 return (EFBIG); 648 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) 649 return (EFBIG); 650 651 /* 652 * If the offset we are starting the write at is beyond the end of 653 * the file, then they've done a seek. Unix filesystems allow 654 * files with holes in them, DOS doesn't so we must fill the hole 655 * with zeroed blocks. 656 */ 657 if (uio->uio_offset > dep->de_FileSize) { 658 error = deextend(dep, uio->uio_offset); 659 if (error) 660 return (error); 661 } 662 663 /* 664 * Remember some values in case the write fails. 665 */ 666 resid = uio->uio_resid; 667 osize = dep->de_FileSize; 668 669 /* 670 * If we write beyond the end of the file, extend it to its ultimate 671 * size ahead of the time to hopefully get a contiguous area. 672 */ 673 if (uio->uio_offset + resid > osize) { 674 count = de_clcount(pmp, uio->uio_offset + resid) - 675 de_clcount(pmp, osize); 676 error = extendfile(dep, count, NULL, NULL, 0); 677 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 678 goto errexit; 679 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 680 } else 681 lastcn = de_clcount(pmp, osize) - 1; 682 683 do { 684 if (de_off2cn(pmp, uio->uio_offset) > lastcn) { 685 error = ENOSPC; 686 break; 687 } 688 689 croffset = uio->uio_offset & pmp->pm_crbomask; 690 n = (int)szmin(uio->uio_resid, pmp->pm_bpcluster - croffset); 691 if (uio->uio_offset + n > dep->de_FileSize) { 692 dep->de_FileSize = uio->uio_offset + n; 693 /* The object size needs to be set before buffer is allocated */ 694 vnode_pager_setsize(vp, dep->de_FileSize); 695 } 696 697 /* 698 * If either the whole cluster gets written, or we write 699 * the cluster from its start beyond EOF, then no need to 700 * read data from disk. 701 * 702 * If UIO_NOCOPY is set we have to do a read-before-write 703 * to fill in any missing pieces of the buffer since no 704 * actual overwrite will occur. 705 */ 706 cn = de_off2cn(pmp, uio->uio_offset); 707 if ((uio->uio_offset & pmp->pm_crbomask) == 0 708 && uio->uio_segflg != UIO_NOCOPY 709 && (de_off2cn(pmp, uio->uio_offset + uio->uio_resid) 710 > de_off2cn(pmp, uio->uio_offset) 711 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 712 bp = getblk(thisvp, de_cn2doff(pmp, cn), 713 pmp->pm_bpcluster, 0, 0); 714 clrbuf(bp); 715 /* 716 * Do the bmap now, since pcbmap needs buffers 717 * for the fat table. (see msdosfs_strategy) 718 */ 719 if (bp->b_bio2.bio_offset == NOOFFSET) { 720 daddr_t lblkno = de_off2cn(pmp, bp->b_loffset); 721 daddr_t dblkno; 722 723 error = pcbmap(dep, lblkno, 724 &dblkno, NULL, NULL); 725 if (error || dblkno == (daddr_t)-1) { 726 bp->b_bio2.bio_offset = NOOFFSET; 727 } else { 728 bp->b_bio2.bio_offset = de_bntodoff(pmp, dblkno); 729 } 730 } 731 if (bp->b_bio2.bio_offset == NOOFFSET) { 732 brelse(bp); 733 if (!error) 734 error = EIO; /* XXX */ 735 break; 736 } 737 } else { 738 /* 739 * The block we need to write into exists, so read 740 * it in. 741 */ 742 error = bread(thisvp, de_cn2doff(pmp, cn), 743 pmp->pm_bpcluster, &bp); 744 if (error) { 745 brelse(bp); 746 break; 747 } 748 } 749 750 /* 751 * Should these vnode_pager_* functions be done on dir 752 * files? 753 */ 754 755 /* 756 * Copy the data from user space into the buf header. 757 */ 758 error = uiomovebp(bp, bp->b_data + croffset, (size_t)n, uio); 759 if (error) { 760 brelse(bp); 761 break; 762 } 763 764 /* 765 * If they want this synchronous then write it and wait for 766 * it. Otherwise, if on a cluster boundary write it 767 * asynchronously so we can move on to the next block 768 * without delay. Otherwise do a delayed write because we 769 * may want to write somemore into the block later. 770 */ 771 if (ioflag & IO_SYNC) 772 bwrite(bp); 773 else if (n + croffset == pmp->pm_bpcluster) 774 bawrite(bp); 775 else 776 bdwrite(bp); 777 dep->de_flag |= DE_UPDATE; 778 } while (error == 0 && uio->uio_resid > 0); 779 780 /* 781 * If the write failed and they want us to, truncate the file back 782 * to the size it was before the write was attempted. 783 */ 784 errexit: 785 if (error) { 786 if (ioflag & IO_UNIT) { 787 detrunc(dep, osize, ioflag & IO_SYNC); 788 uio->uio_offset -= resid - uio->uio_resid; 789 uio->uio_resid = resid; 790 } else { 791 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC); 792 if (uio->uio_resid != resid) 793 error = 0; 794 } 795 } else if (ioflag & IO_SYNC) 796 error = deupdat(dep, 1); 797 return (error); 798 } 799 800 /* 801 * Flush the blocks of a file to disk. 802 * 803 * This function is worthless for vnodes that represent directories. Maybe we 804 * could just do a sync if they try an fsync on a directory file. 805 * 806 * msdosfs_fsync(struct vnode *a_vp, int a_waitfor) 807 */ 808 static int 809 msdosfs_fsync(struct vop_fsync_args *ap) 810 { 811 struct vnode *vp = ap->a_vp; 812 813 /* 814 * Flush all dirty buffers associated with a vnode. 815 */ 816 #ifdef DIAGNOSTIC 817 loop: 818 #endif 819 vfsync(vp, ap->a_waitfor, 0, NULL, NULL); 820 #ifdef DIAGNOSTIC 821 if (ap->a_waitfor == MNT_WAIT && !RB_EMPTY(&vp->v_rbdirty_tree)) { 822 vprint("msdosfs_fsync: dirty", vp); 823 goto loop; 824 } 825 #endif 826 return (deupdat(VTODE(vp), ap->a_waitfor == MNT_WAIT)); 827 } 828 829 /* 830 * msdosfs_remove(struct vnode *a_dvp, struct vnode *a_vp, 831 * struct componentname *a_cnp) 832 */ 833 static int 834 msdosfs_remove(struct vop_old_remove_args *ap) 835 { 836 struct denode *dep = VTODE(ap->a_vp); 837 struct denode *ddep = VTODE(ap->a_dvp); 838 int error; 839 840 if (ap->a_vp->v_type == VDIR) 841 error = EPERM; 842 else 843 error = removede(ddep, dep); 844 #ifdef MSDOSFS_DEBUG 845 kprintf("msdosfs_remove(), dep %p, v_sysrefs %d\n", 846 dep, ap->a_vp->v_sysref.refcnt); 847 #endif 848 return (error); 849 } 850 851 /* 852 * DOS filesystems don't know what links are. But since we already called 853 * msdosfs_lookup() with create and lockparent, the parent is locked so we 854 * have to free it before we return the error. 855 * 856 * msdosfs_link(struct vnode *a_tdvp, struct vnode *a_vp, 857 * struct componentname *a_cnp) 858 */ 859 static int 860 msdosfs_link(struct vop_old_link_args *ap) 861 { 862 return (EOPNOTSUPP); 863 } 864 865 /* 866 * Renames on files require moving the denode to a new hash queue since the 867 * denode's location is used to compute which hash queue to put the file 868 * in. Unless it is a rename in place. For example "mv a b". 869 * 870 * What follows is the basic algorithm: 871 * 872 * if (file move) { 873 * if (dest file exists) { 874 * remove dest file 875 * } 876 * if (dest and src in same directory) { 877 * rewrite name in existing directory slot 878 * } else { 879 * write new entry in dest directory 880 * update offset and dirclust in denode 881 * move denode to new hash chain 882 * clear old directory entry 883 * } 884 * } else { 885 * directory move 886 * if (dest directory exists) { 887 * if (dest is not empty) { 888 * return ENOTEMPTY 889 * } 890 * remove dest directory 891 * } 892 * if (dest and src in same directory) { 893 * rewrite name in existing entry 894 * } else { 895 * be sure dest is not a child of src directory 896 * write entry in dest directory 897 * update "." and ".." in moved directory 898 * clear old directory entry for moved directory 899 * } 900 * } 901 * 902 * On entry: 903 * source's parent directory is unlocked 904 * source file or directory is unlocked 905 * destination's parent directory is locked 906 * destination file or directory is locked if it exists 907 * 908 * On exit: 909 * all denodes should be released 910 * 911 * Notes: 912 * I'm not sure how the memory containing the pathnames pointed at by the 913 * componentname structures is freed, there may be some memory bleeding 914 * for each rename done. 915 * 916 * msdosfs_rename(struct vnode *a_fdvp, struct vnode *a_fvp, 917 * struct componentname *a_fcnp, struct vnode *a_tdvp, 918 * struct vnode *a_tvp, struct componentname *a_tcnp) 919 */ 920 static int 921 msdosfs_rename(struct vop_old_rename_args *ap) 922 { 923 struct vnode *tdvp = ap->a_tdvp; 924 struct vnode *fvp = ap->a_fvp; 925 struct vnode *fdvp = ap->a_fdvp; 926 struct vnode *tvp = ap->a_tvp; 927 struct componentname *tcnp = ap->a_tcnp; 928 struct componentname *fcnp = ap->a_fcnp; 929 struct denode *ip, *xp, *dp, *zp; 930 u_char toname[11], oldname[11]; 931 u_long from_diroffset, to_diroffset; 932 u_char to_count; 933 int doingdirectory = 0, newparent = 0; 934 int error; 935 u_long cn; 936 daddr_t bn; 937 struct msdosfsmount *pmp; 938 struct direntry *dotdotp; 939 struct buf *bp; 940 941 pmp = VFSTOMSDOSFS(fdvp->v_mount); 942 943 /* 944 * Check for cross-device rename. 945 */ 946 if ((fvp->v_mount != tdvp->v_mount) || 947 (tvp && (fvp->v_mount != tvp->v_mount))) { 948 error = EXDEV; 949 abortit: 950 if (tdvp == tvp) 951 vrele(tdvp); 952 else 953 vput(tdvp); 954 if (tvp) 955 vput(tvp); 956 vrele(fdvp); 957 vrele(fvp); 958 return (error); 959 } 960 961 /* 962 * If source and dest are the same, do nothing. 963 */ 964 if (tvp == fvp) { 965 error = 0; 966 goto abortit; 967 } 968 969 /* 970 * fvp, fdvp are unlocked, tvp, tdvp are locked. Lock fvp and note 971 * that we have to unlock it to use the abortit target. 972 */ 973 error = vn_lock(fvp, LK_EXCLUSIVE); 974 if (error) 975 goto abortit; 976 dp = VTODE(fdvp); 977 ip = VTODE(fvp); 978 979 /* 980 * Be sure we are not renaming ".", "..", or an alias of ".". This 981 * leads to a crippled directory tree. It's pretty tough to do a 982 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 983 * doesn't work if the ".." entry is missing. 984 */ 985 if (ip->de_Attributes & ATTR_DIRECTORY) { 986 /* 987 * Avoid ".", "..", and aliases of "." for obvious reasons. 988 */ 989 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 990 dp == ip || 991 (fcnp->cn_flags & CNP_ISDOTDOT) || 992 (tcnp->cn_flags & CNP_ISDOTDOT) || 993 (ip->de_flag & DE_RENAME)) { 994 vn_unlock(fvp); 995 error = EINVAL; 996 goto abortit; 997 } 998 ip->de_flag |= DE_RENAME; 999 doingdirectory++; 1000 } 1001 1002 /* 1003 * fvp locked, fdvp unlocked, tvp, tdvp locked. DE_RENAME only 1004 * set if doingdirectory. We will get fvp unlocked in fairly 1005 * short order. dp and xp must be setup and fvp must be unlocked 1006 * for the out and bad targets to work properly. 1007 */ 1008 dp = VTODE(tdvp); 1009 xp = tvp ? VTODE(tvp) : NULL; 1010 1011 /* 1012 * Remember direntry place to use for destination 1013 */ 1014 to_diroffset = dp->de_fndoffset; 1015 to_count = dp->de_fndcnt; 1016 1017 /* 1018 * If ".." must be changed (ie the directory gets a new 1019 * parent) then the source directory must not be in the 1020 * directory heirarchy above the target, as this would 1021 * orphan everything below the source directory. Also 1022 * the user must have write permission in the source so 1023 * as to be able to change "..". We must repeat the call 1024 * to namei, as the parent directory is unlocked by the 1025 * call to doscheckpath(). 1026 */ 1027 error = VOP_EACCESS(fvp, VWRITE, tcnp->cn_cred); 1028 vn_unlock(fvp); 1029 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1030 newparent = 1; 1031 1032 /* 1033 * ok. fvp, fdvp unlocked, tvp, tdvp locked. tvp may be NULL. 1034 * DE_RENAME only set if doingdirectory. 1035 */ 1036 if (doingdirectory && newparent) { 1037 if (error) /* write access check above */ 1038 goto bad; 1039 if (xp != NULL) { 1040 vput(tvp); 1041 xp = NULL; 1042 } 1043 /* 1044 * checkpath vput's tdvp (VTOI(dp)) on return no matter what, 1045 * get an extra ref so we wind up with just an unlocked, ref'd 1046 * tdvp. The 'out' target skips tvp and tdvp cleanups (tdvp 1047 * isn't locked so we can't use the out target). 1048 */ 1049 vref(tdvp); 1050 error = doscheckpath(ip, dp); 1051 tcnp->cn_flags |= CNP_PDIRUNLOCK; 1052 if (error) { 1053 vrele(tdvp); 1054 goto out; 1055 } 1056 /* 1057 * relookup no longer messes with the ref count. tdvp must 1058 * be unlocked on entry and on success will be locked on 1059 * return. 1060 */ 1061 error = relookup(tdvp, &tvp, tcnp); 1062 if (error) { 1063 if (tcnp->cn_flags & CNP_PDIRUNLOCK) 1064 vrele(tdvp); 1065 else 1066 vput(tdvp); 1067 goto out; 1068 } 1069 1070 /* 1071 * tvp and tdvp are now locked again. 1072 */ 1073 dp = VTODE(tdvp); 1074 xp = tvp ? VTODE(tvp) : NULL; 1075 } 1076 1077 /* 1078 * tvp and tdvp are now locked again, the 'bad' target can be used 1079 * to clean them up again. Delete an existant target and clean 1080 * up tvp. Set xp to NULL to indicate that tvp has been cleaned up. 1081 */ 1082 if (xp != NULL) { 1083 /* 1084 * Target must be empty if a directory and have no links 1085 * to it. Also, ensure source and target are compatible 1086 * (both directories, or both not directories). 1087 */ 1088 if (xp->de_Attributes & ATTR_DIRECTORY) { 1089 if (!dosdirempty(xp)) { 1090 error = ENOTEMPTY; 1091 goto bad; 1092 } 1093 if (!doingdirectory) { 1094 error = ENOTDIR; 1095 goto bad; 1096 } 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 tvp = NULL; 1107 } 1108 1109 /* 1110 * Convert the filename in tcnp into a dos filename. We copy this 1111 * into the denode and directory entry for the destination 1112 * file/directory. 1113 */ 1114 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1115 if (error) 1116 goto bad; 1117 1118 /* 1119 * Since from wasn't locked at various places above, we have to do 1120 * a relookup here. If the target and source are the same directory 1121 * we have to unlock the target directory in order to safely relookup 1122 * the source, because relookup expects its directory to be unlocked. 1123 * 1124 * Note that ap->a_fvp is still valid and ref'd. Any cleanup must 1125 * now take that into account. 1126 * 1127 * The tdvp locking issues make this a real mess. 1128 */ 1129 fcnp->cn_flags &= ~CNP_MODMASK; 1130 fcnp->cn_flags |= CNP_LOCKPARENT; 1131 if (newparent == 0) 1132 vn_unlock(tdvp); 1133 error = relookup(fdvp, &fvp, fcnp); 1134 if (error || fvp == NULL) { 1135 /* 1136 * From name has disappeared. Note: fdvp might == tdvp. 1137 * 1138 * DE_RENAME is only set if doingdirectory. 1139 */ 1140 if (doingdirectory) 1141 panic("rename: lost dir entry"); 1142 if (fcnp->cn_flags & CNP_PDIRUNLOCK) 1143 vrele(fdvp); 1144 else 1145 vput(fdvp); 1146 if (newparent == 0) 1147 vrele(tdvp); 1148 else 1149 vput(tdvp); 1150 vrele(ap->a_fvp); 1151 return(0); 1152 } 1153 1154 /* 1155 * No error occured. tdvp, fdvp and fvp are all locked. If 1156 * newparent was 0 be aware that fdvp == tdvp. tvp has been cleaned 1157 * up. ap->a_fvp is still refd. 1158 */ 1159 xp = VTODE(fvp); 1160 zp = VTODE(fdvp); 1161 from_diroffset = zp->de_fndoffset; 1162 1163 /* 1164 * Ensure that the directory entry still exists and has not 1165 * changed till now. If the source is a file the entry may 1166 * have been unlinked or renamed. In either case there is 1167 * no further work to be done. If the source is a directory 1168 * then it cannot have been rmdir'ed or renamed; this is 1169 * prohibited by the DE_RENAME flag. 1170 * 1171 * DE_RENAME is only set if doingdirectory. 1172 */ 1173 if (xp != ip) { 1174 if (doingdirectory) 1175 panic("rename: lost dir entry"); 1176 goto done; 1177 } else { 1178 u_long new_dirclust; 1179 u_long new_diroffset; 1180 1181 /* 1182 * First write a new entry in the destination 1183 * directory and mark the entry in the source directory 1184 * as deleted. Then move the denode to the correct hash 1185 * chain for its new location in the filesystem. And, if 1186 * we moved a directory, then update its .. entry to point 1187 * to the new parent directory. 1188 */ 1189 bcopy(ip->de_Name, oldname, 11); 1190 bcopy(toname, ip->de_Name, 11); /* update denode */ 1191 dp->de_fndoffset = to_diroffset; 1192 dp->de_fndcnt = to_count; 1193 error = createde(ip, dp, NULL, tcnp); 1194 if (error) { 1195 bcopy(oldname, ip->de_Name, 11); 1196 goto done; 1197 } 1198 ip->de_refcnt++; 1199 zp->de_fndoffset = from_diroffset; 1200 error = removede(zp, ip); 1201 if (error) { 1202 /* XXX should really panic here, fs is corrupt */ 1203 goto done; 1204 } 1205 if (!doingdirectory) { 1206 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 1207 NULL, &new_dirclust, NULL); 1208 if (error) { 1209 /* XXX should really panic here, fs is corrupt */ 1210 goto done; 1211 } 1212 if (new_dirclust == MSDOSFSROOT) 1213 new_diroffset = to_diroffset; 1214 else 1215 new_diroffset = to_diroffset & pmp->pm_crbomask; 1216 msdosfs_reinsert(ip, new_dirclust, new_diroffset); 1217 } 1218 } 1219 1220 /* 1221 * If we moved a directory to a new parent directory, then we must 1222 * fixup the ".." entry in the moved directory. 1223 */ 1224 if (doingdirectory && newparent) { 1225 cn = ip->de_StartCluster; 1226 if (cn == MSDOSFSROOT) { 1227 /* this should never happen */ 1228 panic("msdosfs_rename(): updating .. in root directory?"); 1229 } else { 1230 bn = xcntobn(pmp, cn); 1231 } 1232 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), pmp->pm_bpcluster, &bp); 1233 if (error) { 1234 /* XXX should really panic here, fs is corrupt */ 1235 brelse(bp); 1236 goto done; 1237 } 1238 dotdotp = (struct direntry *)bp->b_data + 1; 1239 putushort(dotdotp->deStartCluster, dp->de_StartCluster); 1240 if (FAT32(pmp)) 1241 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16); 1242 error = bwrite(bp); 1243 if (error) { 1244 /* XXX should really panic here, fs is corrupt */ 1245 goto done; 1246 } 1247 } 1248 1249 /* 1250 * done case fvp, fdvp, tdvp are locked. ap->a_fvp is refd 1251 */ 1252 done: 1253 if (doingdirectory) 1254 ip->de_flag &= ~DE_RENAME; /* XXX fvp not locked */ 1255 vput(fvp); 1256 if (newparent) 1257 vput(fdvp); 1258 else 1259 vrele(fdvp); 1260 vput(tdvp); 1261 vrele(ap->a_fvp); 1262 return (error); 1263 1264 /* 1265 * 'bad' target: xp governs tvp. tvp and tdvp arel ocked, fdvp and fvp 1266 * are not locked. ip points to fvp's inode which may have DE_RENAME 1267 * set. 1268 */ 1269 bad: 1270 if (xp) 1271 vput(tvp); 1272 vput(tdvp); 1273 out: 1274 /* 1275 * 'out' target: tvp and tdvp have already been cleaned up. 1276 */ 1277 if (doingdirectory) 1278 ip->de_flag &= ~DE_RENAME; 1279 vrele(fdvp); 1280 vrele(fvp); 1281 return (error); 1282 1283 } 1284 1285 static struct { 1286 struct direntry dot; 1287 struct direntry dotdot; 1288 } dosdirtemplate = { 1289 { ". ", " ", /* the . entry */ 1290 ATTR_DIRECTORY, /* file attribute */ 1291 0, /* reserved */ 1292 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1293 { 0, 0 }, /* access date */ 1294 { 0, 0 }, /* high bits of start cluster */ 1295 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1296 { 0, 0 }, /* startcluster */ 1297 { 0, 0, 0, 0 } /* filesize */ 1298 }, 1299 { ".. ", " ", /* the .. entry */ 1300 ATTR_DIRECTORY, /* file attribute */ 1301 0, /* reserved */ 1302 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1303 { 0, 0 }, /* access date */ 1304 { 0, 0 }, /* high bits of start cluster */ 1305 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1306 { 0, 0 }, /* startcluster */ 1307 { 0, 0, 0, 0 } /* filesize */ 1308 } 1309 }; 1310 1311 /* 1312 * msdosfs_mkdir(struct vnode *a_dvp, struct vnode **a_vpp, 1313 * struct componentname *a_cnp, struct vattr *a_vap) 1314 */ 1315 static int 1316 msdosfs_mkdir(struct vop_old_mkdir_args *ap) 1317 { 1318 struct componentname *cnp = ap->a_cnp; 1319 struct denode *dep; 1320 struct denode *pdep = VTODE(ap->a_dvp); 1321 struct direntry *denp; 1322 struct msdosfsmount *pmp = pdep->de_pmp; 1323 struct buf *bp; 1324 u_long newcluster, pcl; 1325 int bn; 1326 int error; 1327 struct denode ndirent; 1328 struct timespec ts; 1329 1330 /* 1331 * If this is the root directory and there is no space left we 1332 * can't do anything. This is because the root directory can not 1333 * change size. 1334 */ 1335 if (pdep->de_StartCluster == MSDOSFSROOT 1336 && pdep->de_fndoffset >= pdep->de_FileSize) { 1337 error = ENOSPC; 1338 goto bad2; 1339 } 1340 1341 /* 1342 * Allocate a cluster to hold the about to be created directory. 1343 */ 1344 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1345 if (error) 1346 goto bad2; 1347 1348 bzero(&ndirent, sizeof(ndirent)); 1349 ndirent.de_pmp = pmp; 1350 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1351 getnanotime(&ts); 1352 DETIMES(&ndirent, &ts, &ts, &ts); 1353 1354 /* 1355 * Now fill the cluster with the "." and ".." entries. And write 1356 * the cluster to disk. This way it is there for the parent 1357 * directory to be pointing at if there were a crash. 1358 */ 1359 bn = xcntobn(pmp, newcluster); 1360 /* always succeeds */ 1361 bp = getblk(pmp->pm_devvp, de_bntodoff(pmp, bn), 1362 pmp->pm_bpcluster, 0, 0); 1363 bzero(bp->b_data, pmp->pm_bpcluster); 1364 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1365 denp = (struct direntry *)bp->b_data; 1366 putushort(denp[0].deStartCluster, newcluster); 1367 putushort(denp[0].deCDate, ndirent.de_CDate); 1368 putushort(denp[0].deCTime, ndirent.de_CTime); 1369 denp[0].deCHundredth = ndirent.de_CHun; 1370 putushort(denp[0].deADate, ndirent.de_ADate); 1371 putushort(denp[0].deMDate, ndirent.de_MDate); 1372 putushort(denp[0].deMTime, ndirent.de_MTime); 1373 pcl = pdep->de_StartCluster; 1374 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1375 pcl = 0; 1376 putushort(denp[1].deStartCluster, pcl); 1377 putushort(denp[1].deCDate, ndirent.de_CDate); 1378 putushort(denp[1].deCTime, ndirent.de_CTime); 1379 denp[1].deCHundredth = ndirent.de_CHun; 1380 putushort(denp[1].deADate, ndirent.de_ADate); 1381 putushort(denp[1].deMDate, ndirent.de_MDate); 1382 putushort(denp[1].deMTime, ndirent.de_MTime); 1383 if (FAT32(pmp)) { 1384 putushort(denp[0].deHighClust, newcluster >> 16); 1385 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 1386 } 1387 1388 error = bwrite(bp); 1389 if (error) 1390 goto bad; 1391 1392 /* 1393 * Now build up a directory entry pointing to the newly allocated 1394 * cluster. This will be written to an empty slot in the parent 1395 * directory. 1396 */ 1397 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1398 if (error) 1399 goto bad; 1400 1401 ndirent.de_Attributes = ATTR_DIRECTORY; 1402 ndirent.de_LowerCase = 0; 1403 ndirent.de_StartCluster = newcluster; 1404 ndirent.de_FileSize = 0; 1405 ndirent.de_dev = pdep->de_dev; 1406 ndirent.de_devvp = pdep->de_devvp; 1407 error = createde(&ndirent, pdep, &dep, cnp); 1408 if (error) 1409 goto bad; 1410 *ap->a_vpp = DETOV(dep); 1411 return (0); 1412 1413 bad: 1414 clusterfree(pmp, newcluster, NULL); 1415 bad2: 1416 return (error); 1417 } 1418 1419 /* 1420 * msdosfs_rmdir(struct vnode *a_dvp, struct vnode *a_vp, 1421 * struct componentname *a_cnp) 1422 */ 1423 static int 1424 msdosfs_rmdir(struct vop_old_rmdir_args *ap) 1425 { 1426 struct vnode *vp = ap->a_vp; 1427 struct vnode *dvp = ap->a_dvp; 1428 struct denode *ip, *dp; 1429 int error; 1430 1431 ip = VTODE(vp); 1432 dp = VTODE(dvp); 1433 1434 /* 1435 * Verify the directory is empty (and valid). 1436 * (Rmdir ".." won't be valid since 1437 * ".." will contain a reference to 1438 * the current directory and thus be 1439 * non-empty.) 1440 */ 1441 error = 0; 1442 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1443 error = ENOTEMPTY; 1444 goto out; 1445 } 1446 /* 1447 * Delete the entry from the directory. For dos filesystems this 1448 * gets rid of the directory entry on disk, the in memory copy 1449 * still exists but the de_refcnt is <= 0. This prevents it from 1450 * being found by deget(). When the vput() on dep is done we give 1451 * up access and eventually msdosfs_reclaim() will be called which 1452 * will remove it from the denode cache. 1453 */ 1454 error = removede(dp, ip); 1455 if (error) 1456 goto out; 1457 /* 1458 * This is where we decrement the link count in the parent 1459 * directory. Since dos filesystems don't do this we just purge 1460 * the name cache. 1461 */ 1462 vn_unlock(dvp); 1463 /* 1464 * Truncate the directory that is being deleted. 1465 */ 1466 error = detrunc(ip, (u_long)0, IO_SYNC); 1467 1468 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1469 out: 1470 return (error); 1471 } 1472 1473 /* 1474 * DOS filesystems don't know what symlinks are. 1475 * 1476 * msdosfs_symlink(struct vnode *a_dvp, struct vnode **a_vpp, 1477 * struct componentname *a_cnp, struct vattr *a_vap, 1478 * char *a_target) 1479 */ 1480 static int 1481 msdosfs_symlink(struct vop_old_symlink_args *ap) 1482 { 1483 return (EOPNOTSUPP); 1484 } 1485 1486 /* 1487 * msdosfs_readdir(struct vnode *a_vp, struct uio *a_uio, 1488 * struct ucred *a_cred, int *a_eofflag, int *a_ncookies, 1489 * off_t **a_cookies) 1490 */ 1491 static int 1492 msdosfs_readdir(struct vop_readdir_args *ap) 1493 { 1494 struct mbnambuf nb; 1495 int error = 0; 1496 int diff; 1497 long n; 1498 int blsize; 1499 long on; 1500 u_long cn; 1501 u_long dirsperblk; 1502 long bias = 0; 1503 daddr_t bn, lbn; 1504 struct buf *bp; 1505 struct denode *dep; 1506 struct msdosfsmount *pmp; 1507 struct direntry *dentp; 1508 struct uio *uio = ap->a_uio; 1509 off_t *cookies = NULL; 1510 int ncookies = 0; 1511 off_t offset, off; 1512 int chksum = -1; 1513 ino_t d_ino; 1514 uint16_t d_namlen; 1515 uint8_t d_type; 1516 char *d_name_storage = NULL; 1517 char *d_name = NULL; 1518 1519 if ((error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY)) != 0) 1520 return (error); 1521 1522 dep = VTODE(ap->a_vp); 1523 pmp = dep->de_pmp; 1524 1525 #ifdef MSDOSFS_DEBUG 1526 kprintf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1527 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1528 #endif 1529 1530 /* 1531 * msdosfs_readdir() won't operate properly on regular files since 1532 * it does i/o only with the the filesystem vnode, and hence can 1533 * retrieve the wrong block from the buffer cache for a plain file. 1534 * So, fail attempts to readdir() on a plain file. 1535 */ 1536 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) { 1537 error = ENOTDIR; 1538 goto done; 1539 } 1540 1541 /* 1542 * If the user buffer is smaller than the size of one dos directory 1543 * entry or the file offset is not a multiple of the size of a 1544 * directory entry, then we fail the read. 1545 */ 1546 off = offset = uio->uio_offset; 1547 if (uio->uio_resid < sizeof(struct direntry) || 1548 (offset & (sizeof(struct direntry) - 1))) { 1549 error = EINVAL; 1550 goto done; 1551 } 1552 1553 if (ap->a_ncookies) { 1554 ncookies = uio->uio_resid / 16 + 1; 1555 if (ncookies > 1024) 1556 ncookies = 1024; 1557 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 1558 *ap->a_cookies = cookies; 1559 *ap->a_ncookies = ncookies; 1560 } 1561 1562 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1563 1564 /* 1565 * If they are reading from the root directory then, we simulate 1566 * the . and .. entries since these don't exist in the root 1567 * directory. We also set the offset bias to make up for having to 1568 * simulate these entries. By this I mean that at file offset 64 we 1569 * read the first entry in the root directory that lives on disk. 1570 */ 1571 if (dep->de_StartCluster == MSDOSFSROOT 1572 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1573 #if 0 1574 kprintf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1575 offset); 1576 #endif 1577 bias = 2 * sizeof(struct direntry); 1578 if (offset < bias) { 1579 for (n = (int)offset / sizeof(struct direntry); n < 2; 1580 n++) { 1581 if (FAT32(pmp)) 1582 d_ino = xcntobn(pmp, pmp->pm_rootdirblk) 1583 * dirsperblk; 1584 else 1585 d_ino = 1; 1586 d_type = DT_DIR; 1587 if (n == 0) { 1588 d_namlen = 1; 1589 d_name = "."; 1590 } else if (n == 1) { 1591 d_namlen = 2; 1592 d_name = ".."; 1593 } 1594 if (vop_write_dirent(&error, uio, d_ino, d_type, 1595 d_namlen, d_name)) 1596 goto out; 1597 if (error) 1598 goto out; 1599 offset += sizeof(struct direntry); 1600 off = offset; 1601 if (cookies) { 1602 *cookies++ = offset; 1603 if (--ncookies <= 0) 1604 goto out; 1605 } 1606 } 1607 } 1608 } 1609 1610 d_name_storage = kmalloc(WIN_MAXLEN, M_TEMP, M_WAITOK); 1611 mbnambuf_init(&nb); 1612 off = offset; 1613 1614 while (uio->uio_resid > 0) { 1615 lbn = de_off2cn(pmp, offset - bias); 1616 on = (offset - bias) & pmp->pm_crbomask; 1617 n = szmin(pmp->pm_bpcluster - on, uio->uio_resid); 1618 diff = dep->de_FileSize - (offset - bias); 1619 if (diff <= 0) 1620 break; 1621 n = min(n, diff); 1622 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1623 if (error) 1624 break; 1625 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, &bp); 1626 if (error) { 1627 brelse(bp); 1628 kfree(d_name_storage, M_TEMP); 1629 goto done; 1630 } 1631 n = min(n, blsize - bp->b_resid); 1632 1633 /* 1634 * Convert from dos directory entries to fs-independent 1635 * directory entries. 1636 */ 1637 for (dentp = (struct direntry *)(bp->b_data + on); 1638 (char *)dentp < bp->b_data + on + n; 1639 dentp++, offset += sizeof(struct direntry)) { 1640 #if 0 1641 kprintf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1642 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1643 #endif 1644 d_name = d_name_storage; 1645 d_namlen = 0; 1646 /* 1647 * If this is an unused entry, we can stop. 1648 */ 1649 if (dentp->deName[0] == SLOT_EMPTY) { 1650 brelse(bp); 1651 goto out; 1652 } 1653 /* 1654 * Skip deleted entries. 1655 */ 1656 if (dentp->deName[0] == SLOT_DELETED) { 1657 chksum = -1; 1658 mbnambuf_init(&nb); 1659 continue; 1660 } 1661 /* 1662 * Handle Win95 long directory entries 1663 */ 1664 if (dentp->deAttributes == ATTR_WIN95) { 1665 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1666 continue; 1667 chksum = win2unixfn(&nb, 1668 (struct winentry *)dentp, 1669 chksum, 1670 pmp); 1671 continue; 1672 } 1673 1674 /* 1675 * Skip volume labels 1676 */ 1677 if (dentp->deAttributes & ATTR_VOLUME) { 1678 chksum = -1; 1679 mbnambuf_init(&nb); 1680 continue; 1681 } 1682 /* 1683 * This computation of d_ino must match 1684 * the computation of va_fileid in 1685 * msdosfs_getattr. 1686 */ 1687 if (dentp->deAttributes & ATTR_DIRECTORY) { 1688 d_ino = getushort(dentp->deStartCluster); 1689 if (FAT32(pmp)) 1690 d_ino |= getushort(dentp->deHighClust) << 16; 1691 /* if this is the root directory */ 1692 if (d_ino != MSDOSFSROOT) 1693 d_ino = xcntobn(pmp, d_ino) * dirsperblk; 1694 else if (FAT32(pmp)) 1695 d_ino = xcntobn(pmp, pmp->pm_rootdirblk) 1696 * dirsperblk; 1697 else 1698 d_ino = 1; 1699 d_type = DT_DIR; 1700 } else { 1701 d_ino = offset / sizeof(struct direntry); 1702 d_type = DT_REG; 1703 } 1704 if (chksum != winChksum(dentp->deName)) { 1705 d_namlen = dos2unixfn(dentp->deName, 1706 (u_char *)d_name, 1707 dentp->deLowerCase | 1708 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1709 (LCASE_BASE | LCASE_EXT) : 0), 1710 pmp); 1711 mbnambuf_init(&nb); 1712 } else { 1713 mbnambuf_flush(&nb, d_name, &d_namlen); 1714 } 1715 chksum = -1; 1716 if (vop_write_dirent(&error, uio, d_ino, d_type, 1717 d_namlen, d_name)) { 1718 brelse(bp); 1719 goto out; 1720 } 1721 if (error) { 1722 brelse(bp); 1723 goto out; 1724 } 1725 1726 if (cookies) { 1727 *cookies++ = offset + sizeof(struct direntry); 1728 if (--ncookies <= 0) { 1729 brelse(bp); 1730 goto out; 1731 } 1732 } 1733 off = offset + sizeof(struct direntry); 1734 } 1735 brelse(bp); 1736 } 1737 out: 1738 if (d_name_storage != NULL) 1739 kfree(d_name_storage, M_TEMP); 1740 1741 /* Subtract unused cookies */ 1742 if (ap->a_ncookies) 1743 *ap->a_ncookies -= ncookies; 1744 1745 uio->uio_offset = off; 1746 1747 /* 1748 * Set the eofflag (NFS uses it) 1749 */ 1750 if (ap->a_eofflag) { 1751 if (dep->de_FileSize - (offset - bias) <= 0) 1752 *ap->a_eofflag = 1; 1753 else 1754 *ap->a_eofflag = 0; 1755 } 1756 done: 1757 vn_unlock(ap->a_vp); 1758 return (error); 1759 } 1760 1761 /* 1762 * vp - address of vnode file the file 1763 * bn - which cluster we are interested in mapping to a filesystem block number. 1764 * vpp - returns the vnode for the block special file holding the filesystem 1765 * containing the file of interest 1766 * bnp - address of where to return the filesystem relative block number 1767 * 1768 * msdosfs_bmap(struct vnode *a_vp, off_t a_loffset, 1769 * off_t *a_doffsetp, int *a_runp, int *a_runb) 1770 */ 1771 static int 1772 msdosfs_bmap(struct vop_bmap_args *ap) 1773 { 1774 struct denode *dep = VTODE(ap->a_vp); 1775 struct msdosfsmount *pmp = dep->de_pmp; 1776 daddr_t lbn; 1777 daddr_t dbn; 1778 int error; 1779 1780 if (ap->a_doffsetp == NULL) 1781 return (0); 1782 if (ap->a_runp) { 1783 /* 1784 * Sequential clusters should be counted here. 1785 */ 1786 *ap->a_runp = 0; 1787 } 1788 if (ap->a_runb) { 1789 *ap->a_runb = 0; 1790 } 1791 KKASSERT(((int)ap->a_loffset & ((1 << pmp->pm_cnshift) - 1)) == 0); 1792 lbn = de_off2cn(pmp, ap->a_loffset); 1793 error = pcbmap(dep, lbn, &dbn, NULL, NULL); 1794 if (error || dbn == (daddr_t)-1) { 1795 *ap->a_doffsetp = NOOFFSET; 1796 } else { 1797 *ap->a_doffsetp = de_bntodoff(pmp, dbn); 1798 } 1799 return (error); 1800 } 1801 1802 /* 1803 * msdosfs_strategy(struct vnode *a_vp, struct bio *a_bio) 1804 */ 1805 static int 1806 msdosfs_strategy(struct vop_strategy_args *ap) 1807 { 1808 struct bio *bio = ap->a_bio; 1809 struct bio *nbio; 1810 struct buf *bp = bio->bio_buf; 1811 struct vnode *vp = ap->a_vp; 1812 struct denode *dep = VTODE(vp); 1813 struct msdosfsmount *pmp = dep->de_pmp; 1814 int error = 0; 1815 daddr_t dblkno; 1816 1817 if (vp->v_type == VBLK || vp->v_type == VCHR) 1818 panic("msdosfs_strategy: spec"); 1819 /* 1820 * If we don't already know the filesystem relative block number 1821 * then get it using pcbmap(). If pcbmap() returns the block 1822 * number as -1 then we've got a hole in the file. DOS filesystems 1823 * don't allow files with holes, so we shouldn't ever see this. 1824 */ 1825 nbio = push_bio(bio); 1826 if (nbio->bio_offset == NOOFFSET) { 1827 error = pcbmap(dep, de_off2cn(pmp, bio->bio_offset), 1828 &dblkno, NULL, NULL); 1829 if (error) { 1830 bp->b_error = error; 1831 bp->b_flags |= B_ERROR; 1832 /* I/O was never started on nbio, must biodone(bio) */ 1833 biodone(bio); 1834 return (error); 1835 } 1836 if (dblkno == (daddr_t)-1) { 1837 nbio->bio_offset = NOOFFSET; 1838 vfs_bio_clrbuf(bp); 1839 } else { 1840 nbio->bio_offset = de_bntodoff(pmp, dblkno); 1841 } 1842 } 1843 if (nbio->bio_offset == NOOFFSET) { 1844 /* I/O was never started on nbio, must biodone(bio) */ 1845 biodone(bio); 1846 return (0); 1847 } 1848 /* 1849 * Read/write the block from/to the disk that contains the desired 1850 * file block. 1851 */ 1852 vn_strategy(dep->de_devvp, nbio); 1853 return (0); 1854 } 1855 1856 /* 1857 * msdosfs_print(struct vnode *vp) 1858 */ 1859 static int 1860 msdosfs_print(struct vop_print_args *ap) 1861 { 1862 struct denode *dep = VTODE(ap->a_vp); 1863 1864 kprintf( 1865 "tag VT_MSDOSFS, startcluster %lu, dircluster %lu, diroffset %lu ", 1866 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1867 kprintf(" dev %d, %d", major(dep->de_dev), minor(dep->de_dev)); 1868 lockmgr_printinfo(&ap->a_vp->v_lock); 1869 kprintf("\n"); 1870 return (0); 1871 } 1872 1873 /* 1874 * msdosfs_pathconf(struct vnode *a_vp, int a_name, int *a_retval) 1875 */ 1876 static int 1877 msdosfs_pathconf(struct vop_pathconf_args *ap) 1878 { 1879 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1880 1881 switch (ap->a_name) { 1882 case _PC_LINK_MAX: 1883 *ap->a_retval = 1; 1884 return (0); 1885 case _PC_NAME_MAX: 1886 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1887 return (0); 1888 case _PC_PATH_MAX: 1889 *ap->a_retval = PATH_MAX; 1890 return (0); 1891 case _PC_CHOWN_RESTRICTED: 1892 *ap->a_retval = 1; 1893 return (0); 1894 case _PC_NO_TRUNC: 1895 *ap->a_retval = 0; 1896 return (0); 1897 default: 1898 return (EINVAL); 1899 } 1900 /* NOTREACHED */ 1901 } 1902 1903 /* Global vfs data structures for msdosfs */ 1904 struct vop_ops msdosfs_vnode_vops = { 1905 .vop_default = vop_defaultop, 1906 .vop_access = msdosfs_access, 1907 .vop_bmap = msdosfs_bmap, 1908 .vop_old_lookup = msdosfs_lookup, 1909 .vop_open = msdosfs_open, 1910 .vop_close = msdosfs_close, 1911 .vop_old_create = msdosfs_create, 1912 .vop_fsync = msdosfs_fsync, 1913 .vop_getattr = msdosfs_getattr, 1914 .vop_inactive = msdosfs_inactive, 1915 .vop_old_link = msdosfs_link, 1916 .vop_old_mkdir = msdosfs_mkdir, 1917 .vop_old_mknod = msdosfs_mknod, 1918 .vop_pathconf = msdosfs_pathconf, 1919 .vop_print = msdosfs_print, 1920 .vop_read = msdosfs_read, 1921 .vop_readdir = msdosfs_readdir, 1922 .vop_reclaim = msdosfs_reclaim, 1923 .vop_old_remove = msdosfs_remove, 1924 .vop_old_rename = msdosfs_rename, 1925 .vop_old_rmdir = msdosfs_rmdir, 1926 .vop_setattr = msdosfs_setattr, 1927 .vop_strategy = msdosfs_strategy, 1928 .vop_old_symlink = msdosfs_symlink, 1929 .vop_write = msdosfs_write, 1930 .vop_getpages = vop_stdgetpages, 1931 .vop_putpages = vop_stdputpages 1932 }; 1933