1 /* $FreeBSD: src/sys/msdosfs/msdosfs_vnops.c,v 1.95.2.4 2003/06/13 15:05:47 trhodes Exp $ */ 2 /* $DragonFly: src/sys/vfs/msdosfs/msdosfs_vnops.c,v 1.54 2007/11/20 21:03:50 dillon Exp $ */ 3 /* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $ */ 4 5 /*- 6 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 7 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 8 * All rights reserved. 9 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by TooLs GmbH. 22 * 4. The name of TooLs GmbH may not be used to endorse or promote products 23 * derived from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 28 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 */ 36 /* 37 * Written by Paul Popelka (paulp@uts.amdahl.com) 38 * 39 * You can do anything you want with this software, just don't say you wrote 40 * it, and don't remove this notice. 41 * 42 * This software is provided "as is". 43 * 44 * The author supplies this software to be publicly redistributed on the 45 * understanding that the author is not responsible for the correct 46 * functioning of this software in any circumstances and is not liable for 47 * any damages caused by this software. 48 * 49 * October 1992 50 */ 51 52 #include <sys/param.h> 53 #include <sys/systm.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/buf.h> 58 #include <sys/proc.h> 59 #include <sys/priv.h> 60 #include <sys/namei.h> 61 #include <sys/mount.h> 62 #include <sys/unistd.h> 63 #include <sys/vnode.h> 64 #include <sys/malloc.h> 65 #include <sys/dirent.h> 66 #include <sys/signalvar.h> 67 68 #include <vm/vm.h> 69 #include <vm/vm_extern.h> 70 #include <vm/vm_zone.h> 71 #include <vm/vnode_pager.h> 72 73 #include <sys/buf2.h> 74 75 #include "bpb.h" 76 #include "direntry.h" 77 #include "denode.h" 78 #include "msdosfsmount.h" 79 #include "fat.h" 80 81 #define DOS_FILESIZE_MAX 0xffffffff 82 83 /* 84 * Prototypes for MSDOSFS vnode operations 85 */ 86 static int msdosfs_create (struct vop_old_create_args *); 87 static int msdosfs_mknod (struct vop_old_mknod_args *); 88 static int msdosfs_open (struct vop_open_args *); 89 static int msdosfs_close (struct vop_close_args *); 90 static int msdosfs_access (struct vop_access_args *); 91 static int msdosfs_getattr (struct vop_getattr_args *); 92 static int msdosfs_setattr (struct vop_setattr_args *); 93 static int msdosfs_read (struct vop_read_args *); 94 static int msdosfs_write (struct vop_write_args *); 95 static int msdosfs_fsync (struct vop_fsync_args *); 96 static int msdosfs_remove (struct vop_old_remove_args *); 97 static int msdosfs_link (struct vop_old_link_args *); 98 static int msdosfs_rename (struct vop_old_rename_args *); 99 static int msdosfs_mkdir (struct vop_old_mkdir_args *); 100 static int msdosfs_rmdir (struct vop_old_rmdir_args *); 101 static int msdosfs_symlink (struct vop_old_symlink_args *); 102 static int msdosfs_readdir (struct vop_readdir_args *); 103 static int msdosfs_bmap (struct vop_bmap_args *); 104 static int msdosfs_strategy (struct vop_strategy_args *); 105 static int msdosfs_print (struct vop_print_args *); 106 static int msdosfs_pathconf (struct vop_pathconf_args *ap); 107 108 /* 109 * Some general notes: 110 * 111 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 112 * read/written using the vnode for the filesystem. Blocks that represent 113 * the contents of a file are read/written using the vnode for the file 114 * (including directories when they are read/written as files). This 115 * presents problems for the dos filesystem because data that should be in 116 * an inode (if dos had them) resides in the directory itself. Since we 117 * must update directory entries without the benefit of having the vnode 118 * for the directory we must use the vnode for the filesystem. This means 119 * that when a directory is actually read/written (via read, write, or 120 * readdir, or seek) we must use the vnode for the filesystem instead of 121 * the vnode for the directory as would happen in ufs. This is to insure we 122 * retreive the correct block from the buffer cache since the hash value is 123 * based upon the vnode address and the desired block number. 124 */ 125 126 /* 127 * Create a regular file. On entry the directory to contain the file being 128 * created is locked. We must release before we return. 129 * 130 * msdosfs_create(struct vnode *a_dvp, struct vnode **a_vpp, 131 * struct componentname *a_cnp, struct vattr *a_vap) 132 */ 133 static int 134 msdosfs_create(struct vop_old_create_args *ap) 135 { 136 struct componentname *cnp = ap->a_cnp; 137 struct denode ndirent; 138 struct denode *dep; 139 struct denode *pdep = VTODE(ap->a_dvp); 140 struct timespec ts; 141 int error; 142 143 #ifdef MSDOSFS_DEBUG 144 kprintf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 145 #endif 146 147 /* 148 * If this is the root directory and there is no space left we 149 * can't do anything. This is because the root directory can not 150 * change size. 151 */ 152 if (pdep->de_StartCluster == MSDOSFSROOT 153 && pdep->de_fndoffset >= pdep->de_FileSize) { 154 error = ENOSPC; 155 goto bad; 156 } 157 158 /* 159 * Create a directory entry for the file, then call createde() to 160 * have it installed. NOTE: DOS files are always executable. We 161 * use the absence of the owner write bit to make the file 162 * readonly. 163 */ 164 bzero(&ndirent, sizeof(ndirent)); 165 error = uniqdosname(pdep, cnp, ndirent.de_Name); 166 if (error) 167 goto bad; 168 169 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ? 170 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; 171 ndirent.de_LowerCase = 0; 172 ndirent.de_StartCluster = 0; 173 ndirent.de_FileSize = 0; 174 ndirent.de_dev = pdep->de_dev; 175 ndirent.de_devvp = pdep->de_devvp; 176 ndirent.de_pmp = pdep->de_pmp; 177 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 178 getnanotime(&ts); 179 DETIMES(&ndirent, &ts, &ts, &ts); 180 error = createde(&ndirent, pdep, &dep, cnp); 181 if (error) 182 goto bad; 183 *ap->a_vpp = DETOV(dep); 184 return (0); 185 186 bad: 187 return (error); 188 } 189 190 /* 191 * msdosfs_mknod(struct vnode *a_dvp, struct vnode **a_vpp, 192 * struct componentname *a_cnp, struct vattr *a_vap) 193 */ 194 static int 195 msdosfs_mknod(struct vop_old_mknod_args *ap) 196 { 197 switch (ap->a_vap->va_type) { 198 case VDIR: 199 return (msdosfs_mkdir((struct vop_old_mkdir_args *)ap)); 200 break; 201 202 case VREG: 203 return (msdosfs_create((struct vop_old_create_args *)ap)); 204 break; 205 206 default: 207 return (EINVAL); 208 } 209 /* NOTREACHED */ 210 } 211 212 /* 213 * msdosfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred, 214 * struct file *a_fp) 215 */ 216 static int 217 msdosfs_open(struct vop_open_args *ap) 218 { 219 return(vop_stdopen(ap)); 220 } 221 222 /* 223 * msdosfs_close(struct vnode *a_vp, int a_fflag) 224 */ 225 static int 226 msdosfs_close(struct vop_close_args *ap) 227 { 228 struct vnode *vp = ap->a_vp; 229 struct denode *dep = VTODE(vp); 230 struct timespec ts; 231 232 if (vp->v_sysref.refcnt > 1) { 233 getnanotime(&ts); 234 DETIMES(dep, &ts, &ts, &ts); 235 } 236 return (vop_stdclose(ap)); 237 } 238 239 /* 240 * msdosfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred) 241 */ 242 static int 243 msdosfs_access(struct vop_access_args *ap) 244 { 245 struct denode *dep = VTODE(ap->a_vp); 246 struct msdosfsmount *pmp = dep->de_pmp; 247 mode_t file_mode; 248 249 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) | 250 ((dep->de_Attributes & ATTR_READONLY) ? 251 0 : (S_IWUSR|S_IWGRP|S_IWOTH)); 252 file_mode &= pmp->pm_mask; 253 254 return (vop_helper_access(ap, pmp->pm_uid, pmp->pm_gid, file_mode, 0)); 255 } 256 257 /* 258 * msdosfs_getattr(struct vnode *a_vp, struct vattr *a_vap) 259 */ 260 static int 261 msdosfs_getattr(struct vop_getattr_args *ap) 262 { 263 struct denode *dep = VTODE(ap->a_vp); 264 struct msdosfsmount *pmp = dep->de_pmp; 265 struct vattr *vap = ap->a_vap; 266 mode_t mode; 267 struct timespec ts; 268 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 269 u_long fileid; 270 271 getnanotime(&ts); 272 DETIMES(dep, &ts, &ts, &ts); 273 vap->va_fsid = dev2udev(dep->de_dev); 274 /* 275 * The following computation of the fileid must be the same as that 276 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 277 * doesn't work. 278 */ 279 if (dep->de_Attributes & ATTR_DIRECTORY) { 280 fileid = xcntobn(pmp, dep->de_StartCluster) * dirsperblk; 281 if (dep->de_StartCluster == MSDOSFSROOT) 282 fileid = 1; 283 } else { 284 fileid = xcntobn(pmp, dep->de_dirclust) * dirsperblk; 285 if (dep->de_dirclust == MSDOSFSROOT) 286 fileid = roottobn(pmp, 0) * dirsperblk; 287 fileid += dep->de_diroffset / sizeof(struct direntry); 288 } 289 vap->va_fileid = fileid; 290 if ((dep->de_Attributes & ATTR_READONLY) == 0) 291 mode = S_IRWXU|S_IRWXG|S_IRWXO; 292 else 293 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 294 vap->va_mode = mode & pmp->pm_mask; 295 vap->va_uid = pmp->pm_uid; 296 vap->va_gid = pmp->pm_gid; 297 vap->va_nlink = 1; 298 vap->va_rmajor = VNOVAL; 299 vap->va_rminor = VNOVAL; 300 vap->va_size = dep->de_FileSize; 301 dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime); 302 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 303 dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime); 304 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, &vap->va_ctime); 305 } else { 306 vap->va_atime = vap->va_mtime; 307 vap->va_ctime = vap->va_mtime; 308 } 309 vap->va_flags = 0; 310 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) 311 vap->va_flags |= SF_ARCHIVED; 312 vap->va_gen = 0; 313 vap->va_blocksize = pmp->pm_bpcluster; 314 vap->va_bytes = 315 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 316 vap->va_type = ap->a_vp->v_type; 317 vap->va_filerev = dep->de_modrev; 318 return (0); 319 } 320 321 /* 322 * msdosfs_setattr(struct vnode *a_vp, struct vattr *a_vap, 323 * struct ucred *a_cred) 324 */ 325 static int 326 msdosfs_setattr(struct vop_setattr_args *ap) 327 { 328 struct vnode *vp = ap->a_vp; 329 struct denode *dep = VTODE(ap->a_vp); 330 struct msdosfsmount *pmp = dep->de_pmp; 331 struct vattr *vap = ap->a_vap; 332 struct ucred *cred = ap->a_cred; 333 int error = 0; 334 335 #ifdef MSDOSFS_DEBUG 336 kprintf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", 337 ap->a_vp, vap, cred); 338 #endif 339 340 /* 341 * Check for unsettable attributes. 342 */ 343 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 344 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 345 (vap->va_blocksize != VNOVAL) || (vap->va_rmajor != VNOVAL) || 346 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 347 #ifdef MSDOSFS_DEBUG 348 kprintf("msdosfs_setattr(): returning EINVAL\n"); 349 kprintf(" va_type %d, va_nlink %llx, va_fsid %x, va_fileid %llx\n", 350 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 351 kprintf(" va_blocksize %lx, va_rmajor %x, va_bytes %qx, va_gen %llx\n", 352 vap->va_blocksize, vap->va_rmajor, vap->va_bytes, vap->va_gen); 353 kprintf(" va_uid %x, va_gid %x\n", 354 vap->va_uid, vap->va_gid); 355 #endif 356 return (EINVAL); 357 } 358 if (vap->va_flags != VNOVAL) { 359 if (vp->v_mount->mnt_flag & MNT_RDONLY) 360 return (EROFS); 361 if (cred->cr_uid != pmp->pm_uid && 362 (error = priv_check_cred(cred, PRIV_VFS_SETATTR, 0))) 363 return (error); 364 /* 365 * We are very inconsistent about handling unsupported 366 * attributes. We ignored the access time and the 367 * read and execute bits. We were strict for the other 368 * attributes. 369 * 370 * Here we are strict, stricter than ufs in not allowing 371 * users to attempt to set SF_SETTABLE bits or anyone to 372 * set unsupported bits. However, we ignore attempts to 373 * set ATTR_ARCHIVE for directories `cp -pr' from a more 374 * sensible file system attempts it a lot. 375 */ 376 if (cred->cr_uid != 0) { 377 if (vap->va_flags & SF_SETTABLE) 378 return EPERM; 379 } 380 if (vap->va_flags & ~SF_ARCHIVED) 381 return EOPNOTSUPP; 382 if (vap->va_flags & SF_ARCHIVED) 383 dep->de_Attributes &= ~ATTR_ARCHIVE; 384 else if (!(dep->de_Attributes & ATTR_DIRECTORY)) 385 dep->de_Attributes |= ATTR_ARCHIVE; 386 dep->de_flag |= DE_MODIFIED; 387 } 388 389 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 390 uid_t uid; 391 gid_t gid; 392 393 if (vp->v_mount->mnt_flag & MNT_RDONLY) 394 return (EROFS); 395 uid = vap->va_uid; 396 if (uid == (uid_t)VNOVAL) 397 uid = pmp->pm_uid; 398 gid = vap->va_gid; 399 if (gid == (gid_t)VNOVAL) 400 gid = pmp->pm_gid; 401 if ((cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 402 (gid != pmp->pm_gid && !groupmember(gid, cred))) && 403 (error = priv_check_cred(cred, PRIV_VFS_SETATTR, 0))) 404 return error; 405 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 406 return EINVAL; 407 } 408 409 if (vap->va_size != VNOVAL) { 410 /* 411 * Disallow write attempts on read-only file systems; 412 * unless the file is a socket, fifo, or a block or 413 * character device resident on the file system. 414 */ 415 switch (vp->v_type) { 416 case VDIR: 417 return (EISDIR); 418 /* NOT REACHED */ 419 case VLNK: 420 case VREG: 421 if (vp->v_mount->mnt_flag & MNT_RDONLY) 422 return (EROFS); 423 break; 424 default: 425 break; 426 } 427 error = detrunc(dep, vap->va_size, 0); 428 if (error) 429 return error; 430 } 431 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 432 if (vp->v_mount->mnt_flag & MNT_RDONLY) 433 return (EROFS); 434 if (cred->cr_uid != pmp->pm_uid && 435 (error = priv_check_cred(cred, PRIV_VFS_SETATTR, 0)) && 436 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 437 (error = VOP_EACCESS(ap->a_vp, VWRITE, cred)))) 438 return (error); 439 if (vp->v_type != VDIR) { 440 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 441 vap->va_atime.tv_sec != VNOVAL) { 442 dep->de_flag &= ~DE_ACCESS; 443 unix2dostime(&vap->va_atime, &dep->de_ADate, 444 NULL, NULL); 445 } 446 if (vap->va_mtime.tv_sec != VNOVAL) { 447 dep->de_flag &= ~DE_UPDATE; 448 unix2dostime(&vap->va_mtime, &dep->de_MDate, 449 &dep->de_MTime, NULL); 450 } 451 dep->de_Attributes |= ATTR_ARCHIVE; 452 dep->de_flag |= DE_MODIFIED; 453 } 454 } 455 /* 456 * DOS files only have the ability to have their writability 457 * attribute set, so we use the owner write bit to set the readonly 458 * attribute. 459 */ 460 if (vap->va_mode != (mode_t)VNOVAL) { 461 if (vp->v_mount->mnt_flag & MNT_RDONLY) 462 return (EROFS); 463 if (cred->cr_uid != pmp->pm_uid && 464 (error = priv_check_cred(cred, PRIV_VFS_SETATTR, 0))) 465 return (error); 466 if (vp->v_type != VDIR) { 467 /* We ignore the read and execute bits. */ 468 if (vap->va_mode & VWRITE) 469 dep->de_Attributes &= ~ATTR_READONLY; 470 else 471 dep->de_Attributes |= ATTR_READONLY; 472 dep->de_Attributes |= ATTR_ARCHIVE; 473 dep->de_flag |= DE_MODIFIED; 474 } 475 } 476 return (deupdat(dep, 1)); 477 } 478 479 /* 480 * msdosfs_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 481 * struct ucred *a_cred) 482 */ 483 static int 484 msdosfs_read(struct vop_read_args *ap) 485 { 486 int error = 0; 487 int blsize; 488 int isadir; 489 size_t orig_resid; 490 u_int n; 491 u_long diff; 492 u_long on; 493 daddr_t lbn; 494 daddr_t rablock; 495 off_t raoffset; 496 off_t loffset; 497 int rasize; 498 int seqcount; 499 struct buf *bp; 500 struct vnode *vp = ap->a_vp; 501 struct denode *dep = VTODE(vp); 502 struct msdosfsmount *pmp = dep->de_pmp; 503 struct uio *uio = ap->a_uio; 504 505 if (uio->uio_offset < 0) 506 return (EINVAL); 507 508 if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX) 509 return (0); 510 /* 511 * If they didn't ask for any data, then we are done. 512 */ 513 orig_resid = uio->uio_resid; 514 if (orig_resid == 0) 515 return (0); 516 517 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 518 519 isadir = dep->de_Attributes & ATTR_DIRECTORY; 520 do { 521 if (uio->uio_offset >= dep->de_FileSize) 522 break; 523 524 /* 525 * note: lbn is a cluster number, not a device block number. 526 */ 527 lbn = de_off2cn(pmp, uio->uio_offset); 528 loffset = de_cn2doff(pmp, lbn); 529 530 /* 531 * If we are operating on a directory file then be sure to 532 * do i/o with the vnode for the filesystem instead of the 533 * vnode for the directory. 534 */ 535 if (isadir) { 536 /* 537 * convert cluster # to block #. lbn is a 538 * device block number after this. 539 */ 540 error = pcbmap(dep, lbn, &lbn, NULL, &blsize); 541 loffset = de_bntodoff(pmp, lbn); 542 if (error == E2BIG) { 543 error = EINVAL; 544 break; 545 } else if (error) 546 break; 547 error = bread(pmp->pm_devvp, loffset, blsize, &bp); 548 } else { 549 blsize = pmp->pm_bpcluster; 550 rablock = lbn + 1; 551 raoffset = de_cn2doff(pmp, rablock); 552 if (seqcount > 1 && 553 raoffset < dep->de_FileSize) { 554 rasize = pmp->pm_bpcluster; 555 error = breadn(vp, loffset, blsize, 556 &raoffset, &rasize, 1, &bp); 557 } else { 558 error = bread(vp, loffset, blsize, &bp); 559 } 560 } 561 if (error) { 562 brelse(bp); 563 break; 564 } 565 on = uio->uio_offset & pmp->pm_crbomask; 566 diff = pmp->pm_bpcluster - on; 567 n = szmin(uio->uio_resid, diff); 568 diff = dep->de_FileSize - uio->uio_offset; 569 if (diff < n) 570 n = diff; 571 diff = blsize - bp->b_resid; 572 if (diff < n) 573 n = diff; 574 error = uiomove(bp->b_data + on, (size_t)n, uio); 575 brelse(bp); 576 } while (error == 0 && uio->uio_resid > 0 && n != 0); 577 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 578 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 579 dep->de_flag |= DE_ACCESS; 580 return (error); 581 } 582 583 /* 584 * Write data to a file or directory. 585 * 586 * msdosfs_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 587 * struct ucred *a_cred) 588 */ 589 static int 590 msdosfs_write(struct vop_write_args *ap) 591 { 592 int n; 593 int croffset; 594 size_t resid; 595 u_long osize; 596 int error = 0; 597 u_long count; 598 daddr_t cn, lastcn; 599 struct buf *bp; 600 int ioflag = ap->a_ioflag; 601 struct uio *uio = ap->a_uio; 602 struct thread *td = uio->uio_td; 603 struct vnode *vp = ap->a_vp; 604 struct vnode *thisvp; 605 struct denode *dep = VTODE(vp); 606 struct msdosfsmount *pmp = dep->de_pmp; 607 struct proc *p = (td ? td->td_proc : NULL); 608 struct lwp *lp = (td ? td->td_lwp : NULL); 609 610 #ifdef MSDOSFS_DEBUG 611 kprintf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 612 vp, uio, ioflag, ap->a_cred); 613 kprintf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 614 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 615 #endif 616 617 switch (vp->v_type) { 618 case VREG: 619 if (ioflag & IO_APPEND) 620 uio->uio_offset = dep->de_FileSize; 621 thisvp = vp; 622 break; 623 case VDIR: 624 return EISDIR; 625 default: 626 panic("msdosfs_write(): bad file type"); 627 } 628 629 if (uio->uio_offset < 0) 630 return (EFBIG); 631 632 if (uio->uio_resid == 0) 633 return (0); 634 635 /* 636 * If they've exceeded their filesize limit, tell them about it. 637 */ 638 if (p && 639 ((uoff_t)uio->uio_offset + uio->uio_resid > 640 p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) { 641 lwpsignal(p, lp, SIGXFSZ); 642 return (EFBIG); 643 } 644 645 if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX) 646 return (EFBIG); 647 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) 648 return (EFBIG); 649 650 /* 651 * If the offset we are starting the write at is beyond the end of 652 * the file, then they've done a seek. Unix filesystems allow 653 * files with holes in them, DOS doesn't so we must fill the hole 654 * with zeroed blocks. 655 */ 656 if (uio->uio_offset > dep->de_FileSize) { 657 error = deextend(dep, uio->uio_offset); 658 if (error) 659 return (error); 660 } 661 662 /* 663 * Remember some values in case the write fails. 664 */ 665 resid = uio->uio_resid; 666 osize = dep->de_FileSize; 667 668 /* 669 * If we write beyond the end of the file, extend it to its ultimate 670 * size ahead of the time to hopefully get a contiguous area. 671 */ 672 if (uio->uio_offset + resid > osize) { 673 count = de_clcount(pmp, uio->uio_offset + resid) - 674 de_clcount(pmp, osize); 675 error = extendfile(dep, count, NULL, NULL, 0); 676 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 677 goto errexit; 678 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 679 } else 680 lastcn = de_clcount(pmp, osize) - 1; 681 682 do { 683 if (de_off2cn(pmp, uio->uio_offset) > lastcn) { 684 error = ENOSPC; 685 break; 686 } 687 688 croffset = uio->uio_offset & pmp->pm_crbomask; 689 n = (int)szmin(uio->uio_resid, pmp->pm_bpcluster - croffset); 690 if (uio->uio_offset + n > dep->de_FileSize) { 691 dep->de_FileSize = uio->uio_offset + n; 692 /* The object size needs to be set before buffer is allocated */ 693 vnode_pager_setsize(vp, dep->de_FileSize); 694 } 695 696 /* 697 * If either the whole cluster gets written, or we write 698 * the cluster from its start beyond EOF, then no need to 699 * read data from disk. 700 * 701 * If UIO_NOCOPY is set we have to do a read-before-write 702 * to fill in any missing pieces of the buffer since no 703 * actual overwrite will occur. 704 */ 705 cn = de_off2cn(pmp, uio->uio_offset); 706 if ((uio->uio_offset & pmp->pm_crbomask) == 0 707 && uio->uio_segflg != UIO_NOCOPY 708 && (de_off2cn(pmp, uio->uio_offset + uio->uio_resid) 709 > de_off2cn(pmp, uio->uio_offset) 710 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 711 bp = getblk(thisvp, de_cn2doff(pmp, cn), 712 pmp->pm_bpcluster, 0, 0); 713 clrbuf(bp); 714 /* 715 * Do the bmap now, since pcbmap needs buffers 716 * for the fat table. (see msdosfs_strategy) 717 */ 718 if (bp->b_bio2.bio_offset == NOOFFSET) { 719 daddr_t lblkno = de_off2cn(pmp, bp->b_loffset); 720 daddr_t dblkno; 721 722 error = pcbmap(dep, lblkno, 723 &dblkno, NULL, NULL); 724 if (error || dblkno == (daddr_t)-1) { 725 bp->b_bio2.bio_offset = NOOFFSET; 726 } else { 727 bp->b_bio2.bio_offset = de_bntodoff(pmp, dblkno); 728 } 729 } 730 if (bp->b_bio2.bio_offset == NOOFFSET) { 731 brelse(bp); 732 if (!error) 733 error = EIO; /* XXX */ 734 break; 735 } 736 } else { 737 /* 738 * The block we need to write into exists, so read 739 * it in. 740 */ 741 error = bread(thisvp, de_cn2doff(pmp, cn), 742 pmp->pm_bpcluster, &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, (size_t)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 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); 787 uio->uio_offset -= resid - uio->uio_resid; 788 uio->uio_resid = resid; 789 } else { 790 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC); 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 * msdosfs_fsync(struct vnode *a_vp, int a_waitfor) 806 */ 807 static int 808 msdosfs_fsync(struct vop_fsync_args *ap) 809 { 810 struct vnode *vp = ap->a_vp; 811 812 /* 813 * Flush all dirty buffers associated with a vnode. 814 */ 815 #ifdef DIAGNOSTIC 816 loop: 817 #endif 818 vfsync(vp, ap->a_waitfor, 0, NULL, NULL); 819 #ifdef DIAGNOSTIC 820 if (ap->a_waitfor == MNT_WAIT && !RB_EMPTY(&vp->v_rbdirty_tree)) { 821 vprint("msdosfs_fsync: dirty", vp); 822 goto loop; 823 } 824 #endif 825 return (deupdat(VTODE(vp), ap->a_waitfor == MNT_WAIT)); 826 } 827 828 /* 829 * msdosfs_remove(struct vnode *a_dvp, struct vnode *a_vp, 830 * struct componentname *a_cnp) 831 */ 832 static int 833 msdosfs_remove(struct vop_old_remove_args *ap) 834 { 835 struct denode *dep = VTODE(ap->a_vp); 836 struct denode *ddep = VTODE(ap->a_dvp); 837 int error; 838 839 if (ap->a_vp->v_type == VDIR) 840 error = EPERM; 841 else 842 error = removede(ddep, dep); 843 #ifdef MSDOSFS_DEBUG 844 kprintf("msdosfs_remove(), dep %p, v_sysrefs %d\n", 845 dep, ap->a_vp->v_sysref.refcnt); 846 #endif 847 return (error); 848 } 849 850 /* 851 * DOS filesystems don't know what links are. But since we already called 852 * msdosfs_lookup() with create and lockparent, the parent is locked so we 853 * have to free it before we return the error. 854 * 855 * msdosfs_link(struct vnode *a_tdvp, struct vnode *a_vp, 856 * struct componentname *a_cnp) 857 */ 858 static int 859 msdosfs_link(struct vop_old_link_args *ap) 860 { 861 return (EOPNOTSUPP); 862 } 863 864 /* 865 * Renames on files require moving the denode to a new hash queue since the 866 * denode's location is used to compute which hash queue to put the file 867 * in. Unless it is a rename in place. For example "mv a b". 868 * 869 * What follows is the basic algorithm: 870 * 871 * if (file move) { 872 * if (dest file exists) { 873 * remove dest file 874 * } 875 * if (dest and src in same directory) { 876 * rewrite name in existing directory slot 877 * } else { 878 * write new entry in dest directory 879 * update offset and dirclust in denode 880 * move denode to new hash chain 881 * clear old directory entry 882 * } 883 * } else { 884 * directory move 885 * if (dest directory exists) { 886 * if (dest is not empty) { 887 * return ENOTEMPTY 888 * } 889 * remove dest directory 890 * } 891 * if (dest and src in same directory) { 892 * rewrite name in existing entry 893 * } else { 894 * be sure dest is not a child of src directory 895 * write entry in dest directory 896 * update "." and ".." in moved directory 897 * clear old directory entry for moved directory 898 * } 899 * } 900 * 901 * On entry: 902 * source's parent directory is unlocked 903 * source file or directory is unlocked 904 * destination's parent directory is locked 905 * destination file or directory is locked if it exists 906 * 907 * On exit: 908 * all denodes should be released 909 * 910 * Notes: 911 * I'm not sure how the memory containing the pathnames pointed at by the 912 * componentname structures is freed, there may be some memory bleeding 913 * for each rename done. 914 * 915 * msdosfs_rename(struct vnode *a_fdvp, struct vnode *a_fvp, 916 * struct componentname *a_fcnp, struct vnode *a_tdvp, 917 * struct vnode *a_tvp, struct componentname *a_tcnp) 918 */ 919 static int 920 msdosfs_rename(struct vop_old_rename_args *ap) 921 { 922 struct vnode *tdvp = ap->a_tdvp; 923 struct vnode *fvp = ap->a_fvp; 924 struct vnode *fdvp = ap->a_fdvp; 925 struct vnode *tvp = ap->a_tvp; 926 struct componentname *tcnp = ap->a_tcnp; 927 struct componentname *fcnp = ap->a_fcnp; 928 struct denode *ip, *xp, *dp, *zp; 929 u_char toname[11], oldname[11]; 930 u_long from_diroffset, to_diroffset; 931 u_char to_count; 932 int doingdirectory = 0, newparent = 0; 933 int error; 934 u_long cn; 935 daddr_t bn; 936 struct msdosfsmount *pmp; 937 struct direntry *dotdotp; 938 struct buf *bp; 939 940 pmp = VFSTOMSDOSFS(fdvp->v_mount); 941 942 /* 943 * Check for cross-device rename. 944 */ 945 if ((fvp->v_mount != tdvp->v_mount) || 946 (tvp && (fvp->v_mount != tvp->v_mount))) { 947 error = EXDEV; 948 abortit: 949 if (tdvp == tvp) 950 vrele(tdvp); 951 else 952 vput(tdvp); 953 if (tvp) 954 vput(tvp); 955 vrele(fdvp); 956 vrele(fvp); 957 return (error); 958 } 959 960 /* 961 * If source and dest are the same, do nothing. 962 */ 963 if (tvp == fvp) { 964 error = 0; 965 goto abortit; 966 } 967 968 /* 969 * fvp, fdvp are unlocked, tvp, tdvp are locked. Lock fvp and note 970 * that we have to unlock it to use the abortit target. 971 */ 972 error = vn_lock(fvp, LK_EXCLUSIVE); 973 if (error) 974 goto abortit; 975 dp = VTODE(fdvp); 976 ip = VTODE(fvp); 977 978 /* 979 * Be sure we are not renaming ".", "..", or an alias of ".". This 980 * leads to a crippled directory tree. It's pretty tough to do a 981 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 982 * doesn't work if the ".." entry is missing. 983 */ 984 if (ip->de_Attributes & ATTR_DIRECTORY) { 985 /* 986 * Avoid ".", "..", and aliases of "." for obvious reasons. 987 */ 988 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 989 dp == ip || 990 (fcnp->cn_flags & CNP_ISDOTDOT) || 991 (tcnp->cn_flags & CNP_ISDOTDOT) || 992 (ip->de_flag & DE_RENAME)) { 993 vn_unlock(fvp); 994 error = EINVAL; 995 goto abortit; 996 } 997 ip->de_flag |= DE_RENAME; 998 doingdirectory++; 999 } 1000 1001 /* 1002 * fvp locked, fdvp unlocked, tvp, tdvp locked. DE_RENAME only 1003 * set if doingdirectory. We will get fvp unlocked in fairly 1004 * short order. dp and xp must be setup and fvp must be unlocked 1005 * for the out and bad targets to work properly. 1006 */ 1007 dp = VTODE(tdvp); 1008 xp = tvp ? VTODE(tvp) : NULL; 1009 1010 /* 1011 * Remember direntry place to use for destination 1012 */ 1013 to_diroffset = dp->de_fndoffset; 1014 to_count = dp->de_fndcnt; 1015 1016 /* 1017 * If ".." must be changed (ie the directory gets a new 1018 * parent) then the source directory must not be in the 1019 * directory heirarchy above the target, as this would 1020 * orphan everything below the source directory. Also 1021 * the user must have write permission in the source so 1022 * as to be able to change "..". We must repeat the call 1023 * to namei, as the parent directory is unlocked by the 1024 * call to doscheckpath(). 1025 */ 1026 error = VOP_EACCESS(fvp, VWRITE, tcnp->cn_cred); 1027 vn_unlock(fvp); 1028 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1029 newparent = 1; 1030 1031 /* 1032 * ok. fvp, fdvp unlocked, tvp, tdvp locked. tvp may be NULL. 1033 * DE_RENAME only set if doingdirectory. 1034 */ 1035 if (doingdirectory && newparent) { 1036 if (error) /* write access check above */ 1037 goto bad; 1038 if (xp != NULL) { 1039 vput(tvp); 1040 xp = NULL; 1041 } 1042 /* 1043 * checkpath vput's tdvp (VTOI(dp)) on return no matter what, 1044 * get an extra ref so we wind up with just an unlocked, ref'd 1045 * tdvp. The 'out' target skips tvp and tdvp cleanups (tdvp 1046 * isn't locked so we can't use the out target). 1047 */ 1048 vref(tdvp); 1049 error = doscheckpath(ip, dp); 1050 tcnp->cn_flags |= CNP_PDIRUNLOCK; 1051 if (error) { 1052 vrele(tdvp); 1053 goto out; 1054 } 1055 /* 1056 * relookup no longer messes with the ref count. tdvp must 1057 * be unlocked on entry and on success will be locked on 1058 * return. 1059 */ 1060 error = relookup(tdvp, &tvp, tcnp); 1061 if (error) { 1062 if (tcnp->cn_flags & CNP_PDIRUNLOCK) 1063 vrele(tdvp); 1064 else 1065 vput(tdvp); 1066 goto out; 1067 } 1068 1069 /* 1070 * tvp and tdvp are now locked again. 1071 */ 1072 dp = VTODE(tdvp); 1073 xp = tvp ? VTODE(tvp) : NULL; 1074 } 1075 1076 /* 1077 * tvp and tdvp are now locked again, the 'bad' target can be used 1078 * to clean them up again. Delete an existant target and clean 1079 * up tvp. Set xp to NULL to indicate that tvp has been cleaned up. 1080 */ 1081 if (xp != NULL) { 1082 /* 1083 * Target must be empty if a directory and have no links 1084 * to it. Also, ensure source and target are compatible 1085 * (both directories, or both not directories). 1086 */ 1087 if (xp->de_Attributes & ATTR_DIRECTORY) { 1088 if (!dosdirempty(xp)) { 1089 error = ENOTEMPTY; 1090 goto bad; 1091 } 1092 if (!doingdirectory) { 1093 error = ENOTDIR; 1094 goto bad; 1095 } 1096 } else if (doingdirectory) { 1097 error = EISDIR; 1098 goto bad; 1099 } 1100 error = removede(dp, xp); 1101 if (error) 1102 goto bad; 1103 vput(tvp); 1104 xp = NULL; 1105 tvp = NULL; 1106 } 1107 1108 /* 1109 * Convert the filename in tcnp into a dos filename. We copy this 1110 * into the denode and directory entry for the destination 1111 * file/directory. 1112 */ 1113 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1114 if (error) 1115 goto bad; 1116 1117 /* 1118 * Since from wasn't locked at various places above, we have to do 1119 * a relookup here. If the target and source are the same directory 1120 * we have to unlock the target directory in order to safely relookup 1121 * the source, because relookup expects its directory to be unlocked. 1122 * 1123 * Note that ap->a_fvp is still valid and ref'd. Any cleanup must 1124 * now take that into account. 1125 * 1126 * The tdvp locking issues make this a real mess. 1127 */ 1128 fcnp->cn_flags &= ~CNP_MODMASK; 1129 fcnp->cn_flags |= CNP_LOCKPARENT; 1130 if (newparent == 0) 1131 vn_unlock(tdvp); 1132 error = relookup(fdvp, &fvp, fcnp); 1133 if (error || fvp == NULL) { 1134 /* 1135 * From name has disappeared. Note: fdvp might == tdvp. 1136 * 1137 * DE_RENAME is only set if doingdirectory. 1138 */ 1139 if (doingdirectory) 1140 panic("rename: lost dir entry"); 1141 if (fcnp->cn_flags & CNP_PDIRUNLOCK) 1142 vrele(fdvp); 1143 else 1144 vput(fdvp); 1145 if (newparent == 0) 1146 vrele(tdvp); 1147 else 1148 vput(tdvp); 1149 vrele(ap->a_fvp); 1150 return(0); 1151 } 1152 1153 /* 1154 * No error occured. tdvp, fdvp and fvp are all locked. If 1155 * newparent was 0 be aware that fdvp == tdvp. tvp has been cleaned 1156 * up. ap->a_fvp is still refd. 1157 */ 1158 xp = VTODE(fvp); 1159 zp = VTODE(fdvp); 1160 from_diroffset = zp->de_fndoffset; 1161 1162 /* 1163 * Ensure that the directory entry still exists and has not 1164 * changed till now. If the source is a file the entry may 1165 * have been unlinked or renamed. In either case there is 1166 * no further work to be done. If the source is a directory 1167 * then it cannot have been rmdir'ed or renamed; this is 1168 * prohibited by the DE_RENAME flag. 1169 * 1170 * DE_RENAME is only set if doingdirectory. 1171 */ 1172 if (xp != ip) { 1173 if (doingdirectory) 1174 panic("rename: lost dir entry"); 1175 goto done; 1176 } else { 1177 u_long new_dirclust; 1178 u_long new_diroffset; 1179 1180 /* 1181 * First write a new entry in the destination 1182 * directory and mark the entry in the source directory 1183 * as deleted. Then move the denode to the correct hash 1184 * chain for its new location in the filesystem. And, if 1185 * we moved a directory, then update its .. entry to point 1186 * to the new parent directory. 1187 */ 1188 bcopy(ip->de_Name, oldname, 11); 1189 bcopy(toname, ip->de_Name, 11); /* update denode */ 1190 dp->de_fndoffset = to_diroffset; 1191 dp->de_fndcnt = to_count; 1192 error = createde(ip, dp, NULL, tcnp); 1193 if (error) { 1194 bcopy(oldname, ip->de_Name, 11); 1195 goto done; 1196 } 1197 ip->de_refcnt++; 1198 zp->de_fndoffset = from_diroffset; 1199 error = removede(zp, ip); 1200 if (error) { 1201 /* XXX should really panic here, fs is corrupt */ 1202 goto done; 1203 } 1204 if (!doingdirectory) { 1205 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 1206 NULL, &new_dirclust, NULL); 1207 if (error) { 1208 /* XXX should really panic here, fs is corrupt */ 1209 goto done; 1210 } 1211 if (new_dirclust == MSDOSFSROOT) 1212 new_diroffset = to_diroffset; 1213 else 1214 new_diroffset = to_diroffset & pmp->pm_crbomask; 1215 msdosfs_reinsert(ip, new_dirclust, new_diroffset); 1216 } 1217 } 1218 1219 /* 1220 * If we moved a directory to a new parent directory, then we must 1221 * fixup the ".." entry in the moved directory. 1222 */ 1223 if (doingdirectory && newparent) { 1224 cn = ip->de_StartCluster; 1225 if (cn == MSDOSFSROOT) { 1226 /* this should never happen */ 1227 panic("msdosfs_rename(): updating .. in root directory?"); 1228 } else { 1229 bn = xcntobn(pmp, cn); 1230 } 1231 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), pmp->pm_bpcluster, &bp); 1232 if (error) { 1233 /* XXX should really panic here, fs is corrupt */ 1234 brelse(bp); 1235 goto done; 1236 } 1237 dotdotp = (struct direntry *)bp->b_data + 1; 1238 putushort(dotdotp->deStartCluster, dp->de_StartCluster); 1239 if (FAT32(pmp)) 1240 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16); 1241 error = bwrite(bp); 1242 if (error) { 1243 /* XXX should really panic here, fs is corrupt */ 1244 goto done; 1245 } 1246 } 1247 1248 /* 1249 * done case fvp, fdvp, tdvp are locked. ap->a_fvp is refd 1250 */ 1251 done: 1252 if (doingdirectory) 1253 ip->de_flag &= ~DE_RENAME; /* XXX fvp not locked */ 1254 vput(fvp); 1255 if (newparent) 1256 vput(fdvp); 1257 else 1258 vrele(fdvp); 1259 vput(tdvp); 1260 vrele(ap->a_fvp); 1261 return (error); 1262 1263 /* 1264 * 'bad' target: xp governs tvp. tvp and tdvp arel ocked, fdvp and fvp 1265 * are not locked. ip points to fvp's inode which may have DE_RENAME 1266 * set. 1267 */ 1268 bad: 1269 if (xp) 1270 vput(tvp); 1271 vput(tdvp); 1272 out: 1273 /* 1274 * 'out' target: tvp and tdvp have already been cleaned up. 1275 */ 1276 if (doingdirectory) 1277 ip->de_flag &= ~DE_RENAME; 1278 vrele(fdvp); 1279 vrele(fvp); 1280 return (error); 1281 1282 } 1283 1284 static struct { 1285 struct direntry dot; 1286 struct direntry dotdot; 1287 } dosdirtemplate = { 1288 { ". ", " ", /* the . entry */ 1289 ATTR_DIRECTORY, /* file attribute */ 1290 0, /* reserved */ 1291 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1292 { 0, 0 }, /* access date */ 1293 { 0, 0 }, /* high bits of start cluster */ 1294 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1295 { 0, 0 }, /* startcluster */ 1296 { 0, 0, 0, 0 } /* filesize */ 1297 }, 1298 { ".. ", " ", /* the .. entry */ 1299 ATTR_DIRECTORY, /* file attribute */ 1300 0, /* reserved */ 1301 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1302 { 0, 0 }, /* access date */ 1303 { 0, 0 }, /* high bits of start cluster */ 1304 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1305 { 0, 0 }, /* startcluster */ 1306 { 0, 0, 0, 0 } /* filesize */ 1307 } 1308 }; 1309 1310 /* 1311 * msdosfs_mkdir(struct vnode *a_dvp, struct vnode **a_vpp, 1312 * struct componentname *a_cnp, struct vattr *a_vap) 1313 */ 1314 static int 1315 msdosfs_mkdir(struct vop_old_mkdir_args *ap) 1316 { 1317 struct componentname *cnp = ap->a_cnp; 1318 struct denode *dep; 1319 struct denode *pdep = VTODE(ap->a_dvp); 1320 struct direntry *denp; 1321 struct msdosfsmount *pmp = pdep->de_pmp; 1322 struct buf *bp; 1323 u_long newcluster, pcl; 1324 int bn; 1325 int error; 1326 struct denode ndirent; 1327 struct timespec ts; 1328 1329 /* 1330 * If this is the root directory and there is no space left we 1331 * can't do anything. This is because the root directory can not 1332 * change size. 1333 */ 1334 if (pdep->de_StartCluster == MSDOSFSROOT 1335 && pdep->de_fndoffset >= pdep->de_FileSize) { 1336 error = ENOSPC; 1337 goto bad2; 1338 } 1339 1340 /* 1341 * Allocate a cluster to hold the about to be created directory. 1342 */ 1343 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1344 if (error) 1345 goto bad2; 1346 1347 bzero(&ndirent, sizeof(ndirent)); 1348 ndirent.de_pmp = pmp; 1349 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1350 getnanotime(&ts); 1351 DETIMES(&ndirent, &ts, &ts, &ts); 1352 1353 /* 1354 * Now fill the cluster with the "." and ".." entries. And write 1355 * the cluster to disk. This way it is there for the parent 1356 * directory to be pointing at if there were a crash. 1357 */ 1358 bn = xcntobn(pmp, newcluster); 1359 /* always succeeds */ 1360 bp = getblk(pmp->pm_devvp, de_bntodoff(pmp, bn), 1361 pmp->pm_bpcluster, 0, 0); 1362 bzero(bp->b_data, pmp->pm_bpcluster); 1363 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1364 denp = (struct direntry *)bp->b_data; 1365 putushort(denp[0].deStartCluster, newcluster); 1366 putushort(denp[0].deCDate, ndirent.de_CDate); 1367 putushort(denp[0].deCTime, ndirent.de_CTime); 1368 denp[0].deCHundredth = ndirent.de_CHun; 1369 putushort(denp[0].deADate, ndirent.de_ADate); 1370 putushort(denp[0].deMDate, ndirent.de_MDate); 1371 putushort(denp[0].deMTime, ndirent.de_MTime); 1372 pcl = pdep->de_StartCluster; 1373 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1374 pcl = 0; 1375 putushort(denp[1].deStartCluster, pcl); 1376 putushort(denp[1].deCDate, ndirent.de_CDate); 1377 putushort(denp[1].deCTime, ndirent.de_CTime); 1378 denp[1].deCHundredth = ndirent.de_CHun; 1379 putushort(denp[1].deADate, ndirent.de_ADate); 1380 putushort(denp[1].deMDate, ndirent.de_MDate); 1381 putushort(denp[1].deMTime, ndirent.de_MTime); 1382 if (FAT32(pmp)) { 1383 putushort(denp[0].deHighClust, newcluster >> 16); 1384 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 1385 } 1386 1387 error = bwrite(bp); 1388 if (error) 1389 goto bad; 1390 1391 /* 1392 * Now build up a directory entry pointing to the newly allocated 1393 * cluster. This will be written to an empty slot in the parent 1394 * directory. 1395 */ 1396 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1397 if (error) 1398 goto bad; 1399 1400 ndirent.de_Attributes = ATTR_DIRECTORY; 1401 ndirent.de_LowerCase = 0; 1402 ndirent.de_StartCluster = newcluster; 1403 ndirent.de_FileSize = 0; 1404 ndirent.de_dev = pdep->de_dev; 1405 ndirent.de_devvp = pdep->de_devvp; 1406 error = createde(&ndirent, pdep, &dep, cnp); 1407 if (error) 1408 goto bad; 1409 *ap->a_vpp = DETOV(dep); 1410 return (0); 1411 1412 bad: 1413 clusterfree(pmp, newcluster, NULL); 1414 bad2: 1415 return (error); 1416 } 1417 1418 /* 1419 * msdosfs_rmdir(struct vnode *a_dvp, struct vnode *a_vp, 1420 * struct componentname *a_cnp) 1421 */ 1422 static int 1423 msdosfs_rmdir(struct vop_old_rmdir_args *ap) 1424 { 1425 struct vnode *vp = ap->a_vp; 1426 struct vnode *dvp = ap->a_dvp; 1427 struct denode *ip, *dp; 1428 int error; 1429 1430 ip = VTODE(vp); 1431 dp = VTODE(dvp); 1432 1433 /* 1434 * Verify the directory is empty (and valid). 1435 * (Rmdir ".." won't be valid since 1436 * ".." will contain a reference to 1437 * the current directory and thus be 1438 * non-empty.) 1439 */ 1440 error = 0; 1441 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1442 error = ENOTEMPTY; 1443 goto out; 1444 } 1445 /* 1446 * Delete the entry from the directory. For dos filesystems this 1447 * gets rid of the directory entry on disk, the in memory copy 1448 * still exists but the de_refcnt is <= 0. This prevents it from 1449 * being found by deget(). When the vput() on dep is done we give 1450 * up access and eventually msdosfs_reclaim() will be called which 1451 * will remove it from the denode cache. 1452 */ 1453 error = removede(dp, ip); 1454 if (error) 1455 goto out; 1456 /* 1457 * This is where we decrement the link count in the parent 1458 * directory. Since dos filesystems don't do this we just purge 1459 * the name cache. 1460 */ 1461 vn_unlock(dvp); 1462 /* 1463 * Truncate the directory that is being deleted. 1464 */ 1465 error = detrunc(ip, (u_long)0, IO_SYNC); 1466 1467 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1468 out: 1469 return (error); 1470 } 1471 1472 /* 1473 * DOS filesystems don't know what symlinks are. 1474 * 1475 * msdosfs_symlink(struct vnode *a_dvp, struct vnode **a_vpp, 1476 * struct componentname *a_cnp, struct vattr *a_vap, 1477 * char *a_target) 1478 */ 1479 static int 1480 msdosfs_symlink(struct vop_old_symlink_args *ap) 1481 { 1482 return (EOPNOTSUPP); 1483 } 1484 1485 /* 1486 * msdosfs_readdir(struct vnode *a_vp, struct uio *a_uio, 1487 * struct ucred *a_cred, int *a_eofflag, int *a_ncookies, 1488 * off_t **a_cookies) 1489 */ 1490 static int 1491 msdosfs_readdir(struct vop_readdir_args *ap) 1492 { 1493 struct mbnambuf nb; 1494 int error = 0; 1495 int diff; 1496 long n; 1497 int blsize; 1498 long on; 1499 u_long cn; 1500 u_long dirsperblk; 1501 long bias = 0; 1502 daddr_t bn, lbn; 1503 struct buf *bp; 1504 struct denode *dep; 1505 struct msdosfsmount *pmp; 1506 struct direntry *dentp; 1507 struct uio *uio = ap->a_uio; 1508 off_t *cookies = NULL; 1509 int ncookies = 0; 1510 off_t offset, off; 1511 int chksum = -1; 1512 ino_t d_ino; 1513 uint16_t d_namlen; 1514 uint8_t d_type; 1515 char *d_name_storage = NULL; 1516 char *d_name = NULL; 1517 1518 if ((error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY)) != 0) 1519 return (error); 1520 1521 dep = VTODE(ap->a_vp); 1522 pmp = dep->de_pmp; 1523 1524 #ifdef MSDOSFS_DEBUG 1525 kprintf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1526 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1527 #endif 1528 1529 /* 1530 * msdosfs_readdir() won't operate properly on regular files since 1531 * it does i/o only with the the filesystem vnode, and hence can 1532 * retrieve the wrong block from the buffer cache for a plain file. 1533 * So, fail attempts to readdir() on a plain file. 1534 */ 1535 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) { 1536 error = ENOTDIR; 1537 goto done; 1538 } 1539 1540 /* 1541 * If the user buffer is smaller than the size of one dos directory 1542 * entry or the file offset is not a multiple of the size of a 1543 * directory entry, then we fail the read. 1544 */ 1545 off = offset = uio->uio_offset; 1546 if (uio->uio_resid < sizeof(struct direntry) || 1547 (offset & (sizeof(struct direntry) - 1))) { 1548 error = EINVAL; 1549 goto done; 1550 } 1551 1552 if (ap->a_ncookies) { 1553 ncookies = uio->uio_resid / 16 + 1; 1554 if (ncookies > 1024) 1555 ncookies = 1024; 1556 MALLOC(cookies, off_t *, ncookies * sizeof(off_t), M_TEMP, 1557 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