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1.1 ! root 1: /* ! 2: * Written by Paul Popelka ([email protected]) ! 3: * ! 4: * You can do anything you want with this software, ! 5: * just don't say you wrote it, ! 6: * and don't remove this notice. ! 7: * ! 8: * This software is provided "as is". ! 9: * ! 10: * The author supplies this software to be publicly ! 11: * redistributed on the understanding that the author ! 12: * is not responsible for the correct functioning of ! 13: * this software in any circumstances and is not liable ! 14: * for any damages caused by this software. ! 15: * ! 16: * October 1992 ! 17: * ! 18: * pcfs_vnops.c,v 1.3.2.1 1993/08/05 02:37:23 cgd Exp ! 19: */ ! 20: ! 21: #include "param.h" ! 22: #include "systm.h" ! 23: #include "namei.h" ! 24: #include "resourcevar.h" /* defines plimit structure in proc struct */ ! 25: #include "kernel.h" ! 26: #include "file.h" /* define FWRITE ... */ ! 27: #include "stat.h" ! 28: #include "buf.h" ! 29: #include "proc.h" ! 30: #include "mount.h" ! 31: #include "vnode.h" ! 32: #include "specdev.h" /* defines plimit structure in the proc struct */ ! 33: #include "malloc.h" ! 34: ! 35: #include "dir.h" /* defines dirent structure */ ! 36: ! 37: #include "bpb.h" ! 38: #include "direntry.h" ! 39: #include "denode.h" ! 40: #include "pcfsmount.h" ! 41: #include "fat.h" ! 42: /* ! 43: * Some general notes: ! 44: * ! 45: * In the ufs filesystem the inodes, superblocks, and indirect ! 46: * blocks are read/written using the vnode for the filesystem. ! 47: * Blocks that represent the contents of a file are read/written ! 48: * using the vnode for the file (including directories when ! 49: * they are read/written as files). ! 50: * This presents problems for the dos filesystem because data ! 51: * that should be in an inode (if dos had them) resides in the ! 52: * directory itself. Since we must update directory entries ! 53: * without the benefit of having the vnode for the directory ! 54: * we must use the vnode for the filesystem. This means that ! 55: * when a directory is actually read/written (via read, write, ! 56: * or readdir, or seek) we must use the vnode for the filesystem ! 57: * instead of the vnode for the directory as would happen in ufs. ! 58: * This is to insure we retreive the correct block from the ! 59: * buffer cache since the hash value is based upon the vnode ! 60: * address and the desired block number. ! 61: */ ! 62: ! 63: /* ! 64: * Create a regular file. ! 65: * On entry the directory to contain the file being ! 66: * created is locked. We must release before we ! 67: * return. ! 68: * We must also free the pathname buffer pointed at ! 69: * by ndp->ni_pnbuf, always on error, or only if the ! 70: * SAVESTART bit in ni_nameiop is clear on success. ! 71: */ ! 72: int ! 73: pcfs_create(ndp, vap, p) ! 74: struct nameidata *ndp; ! 75: struct vattr *vap; ! 76: struct proc *p; ! 77: { ! 78: struct denode ndirent; ! 79: struct direntry *ndirp = &ndirent.de_de; ! 80: struct denode *dep; ! 81: struct denode *pdep = VTODE(ndp->ni_dvp); ! 82: int error; ! 83: #if defined(PCFSDEBUG) ! 84: printf("pcfs_create(ndp %08x, vap %08x, p %08x\n", ndp, vap, p); ! 85: #endif /* defined(PCFSDEBUG) */ ! 86: ! 87: /* ! 88: * Create a directory entry for the file, then call ! 89: * createde() to have it installed. ! 90: * NOTE: DOS files are always executable. We use the ! 91: * absence of the owner write bit to make the file readonly. ! 92: */ ! 93: bzero(&ndirent, sizeof(ndirent)); ! 94: unix2dostime(&time, (union dosdate *)&ndirp->deDate, ! 95: (union dostime *)&ndirp->deTime); ! 96: unix2dosfn((u_char *)ndp->ni_ptr, ndirp->deName, ndp->ni_namelen); ! 97: ndirp->deAttributes = (vap->va_mode & VWRITE) ? 0 : ATTR_READONLY; ! 98: ndirp->deStartCluster = 0; ! 99: ndirp->deFileSize = 0; ! 100: ndirent.de_pmp = pdep->de_pmp; ! 101: ndirent.de_dev = pdep->de_dev; ! 102: ndirent.de_devvp = pdep->de_devvp; ! 103: if ((error = createde(&ndirent, ndp, &dep)) == 0) { ! 104: ndp->ni_vp = DETOV(dep); ! 105: if ((ndp->ni_nameiop & SAVESTART) == 0) ! 106: free(ndp->ni_pnbuf, M_NAMEI); ! 107: } else { ! 108: free(ndp->ni_pnbuf, M_NAMEI); ! 109: } ! 110: deput(pdep); /* release parent dir */ ! 111: return error; ! 112: } ! 113: ! 114: int ! 115: pcfs_mknod(ndp, vap, cred, p) ! 116: struct nameidata *ndp; ! 117: struct vattr *vap; ! 118: struct ucred *cred; ! 119: struct proc *p; ! 120: { ! 121: int error; ! 122: ! 123: switch (vap->va_type) { ! 124: case VDIR: ! 125: error = pcfs_mkdir(ndp, vap, p); ! 126: break; ! 127: ! 128: /* ! 129: * pcfs_create() sets ndp->ni_vp. ! 130: */ ! 131: case VREG: ! 132: error = pcfs_create(ndp, vap, p); ! 133: break; ! 134: ! 135: default: ! 136: error = EINVAL; ! 137: break; ! 138: } ! 139: return error; ! 140: } ! 141: ! 142: int ! 143: pcfs_open(vp, mode, cred, p) ! 144: struct vnode *vp; ! 145: int mode; ! 146: struct ucred *cred; ! 147: struct proc *p; ! 148: { ! 149: return 0; ! 150: } ! 151: ! 152: int ! 153: pcfs_close(vp, fflag, cred, p) ! 154: struct vnode *vp; ! 155: int fflag; ! 156: struct ucred *cred; ! 157: struct proc *p; ! 158: { ! 159: struct denode *dep = VTODE(vp); ! 160: ! 161: if (vp->v_usecount > 1 && !(dep->de_flag & DELOCKED)) ! 162: DETIMES(dep, &time); ! 163: return 0; ! 164: } ! 165: ! 166: int ! 167: pcfs_access(vp, mode, cred, p) ! 168: struct vnode *vp; ! 169: int mode; ! 170: struct ucred *cred; ! 171: struct proc *p; ! 172: { ! 173: int dosmode; ! 174: struct denode *dep = VTODE(vp); ! 175: ! 176: /* ! 177: * Root gets to do anything. Even execute a file ! 178: * without the x-bit on? But, for dos filesystems ! 179: * every file is executable. I may regret this. ! 180: */ ! 181: if (cred->cr_uid == 0) ! 182: return 0; ! 183: ! 184: /* ! 185: * mode is filled with a combination of VREAD, VWRITE, ! 186: * and/or VEXEC bits turned on. In an octal number these ! 187: * are the Y in 0Y00. ! 188: * ! 189: * Since the dos filesystem doesn't have the concept of ! 190: * file ownership we just give everybody read and execute ! 191: * access and write access if the readonly bit is off. ! 192: */ ! 193: dosmode = VEXEC | VREAD | ! 194: ((dep->de_Attributes & ATTR_READONLY) ? 0 : VWRITE); ! 195: return ((dosmode & mode) != 0) ? 0 : EACCES; ! 196: } ! 197: ! 198: int ! 199: pcfs_getattr(vp, vap, cred, p) ! 200: struct vnode *vp; ! 201: struct vattr *vap; ! 202: struct ucred *cred; ! 203: struct proc *p; ! 204: { ! 205: u_int cn; ! 206: struct denode *dep = VTODE(vp); ! 207: ! 208: DETIMES(dep, &time); ! 209: vap->va_fsid = dep->de_dev; ! 210: /* The following computation of the fileid must be the ! 211: * same as that used in pcfs_readdir() to compute d_fileno. ! 212: * If not, pwd doesn't work. */ ! 213: if (dep->de_Attributes & ATTR_DIRECTORY) { ! 214: if ((cn = dep->de_StartCluster) == PCFSROOT) ! 215: cn = 1; ! 216: } else { ! 217: if ((cn = dep->de_dirclust) == PCFSROOT) ! 218: cn = 1; ! 219: cn = (cn << 16) | (dep->de_diroffset & 0xffff); ! 220: } ! 221: vap->va_fileid = cn; ! 222: vap->va_mode = (dep->de_Attributes & ATTR_READONLY) ? 0555 : 0777; ! 223: if (dep->de_Attributes & ATTR_DIRECTORY) ! 224: vap->va_mode |= S_IFDIR; ! 225: vap->va_nlink = 1; ! 226: vap->va_gid = 0; ! 227: vap->va_uid = 0; ! 228: vap->va_rdev = 0; ! 229: vap->va_size = dep->de_FileSize; ! 230: vap->va_size_rsv = 0; ! 231: dos2unixtime((union dosdate *)&dep->de_Date, ! 232: (union dostime *)&dep->de_Time, &vap->va_atime); ! 233: vap->va_atime.tv_usec = 0; ! 234: vap->va_mtime.tv_sec = vap->va_atime.tv_sec; ! 235: vap->va_mtime.tv_usec = 0; ! 236: vap->va_ctime.tv_sec = vap->va_atime.tv_sec; ! 237: vap->va_ctime.tv_usec = 0; ! 238: vap->va_flags = dep->de_flag; ! 239: vap->va_gen = 0; ! 240: vap->va_blocksize = dep->de_pmp->pm_bpcluster; ! 241: vap->va_bytes = (dep->de_FileSize + dep->de_pmp->pm_crbomask) & ! 242: ~(dep->de_pmp->pm_crbomask); ! 243: vap->va_bytes_rsv = 0; ! 244: vap->va_type = vp->v_type; ! 245: return 0; ! 246: } ! 247: ! 248: int ! 249: pcfs_setattr(vp, vap, cred, p) ! 250: struct vnode *vp; ! 251: struct vattr *vap; ! 252: struct ucred *cred; ! 253: struct proc *p; ! 254: { ! 255: int error = 0; ! 256: struct denode *dep = VTODE(vp); ! 257: ! 258: #if defined(PCFSDEBUG) ! 259: printf("pcfs_setattr(): vp %08x, vap %08x, cred %08x, p %08x\n", ! 260: vp, vap, cred, p); ! 261: #endif /* defined(PCFSDEBUG) */ ! 262: if ((vap->va_type != VNON) || ! 263: (vap->va_nlink != VNOVAL) || ! 264: (vap->va_fsid != VNOVAL) || ! 265: (vap->va_fileid != VNOVAL) || ! 266: (vap->va_blocksize != VNOVAL) || ! 267: (vap->va_rdev != VNOVAL) || ! 268: (vap->va_bytes != VNOVAL) || ! 269: (vap->va_gen != VNOVAL) || ! 270: #if 0 ! 271: (vap->va_uid != (u_short)VNOVAL) || ! 272: (vap->va_gid != (u_short)VNOVAL) || ! 273: (vap->va_atime.tv_sec != VNOVAL) || ! 274: #endif ! 275: 0) { ! 276: #if defined(PCFSDEBUG) ! 277: printf("pcfs_setattr(): returning EINVAL\n"); ! 278: printf(" va_type %d, va_nlink %x, va_fsid %x, va_fileid %x\n", ! 279: vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); ! 280: printf(" va_blocksize %x, va_rdev %x, va_bytes %x, va_gen %x\n", ! 281: vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); ! 282: printf(" va_uid %x, va_gid %x, va_atime.tv_sec %x\n", ! 283: vap->va_uid, vap->va_gid, vap->va_atime.tv_sec); ! 284: #endif /* defined(PCFSDEBUG) */ ! 285: return EINVAL; ! 286: } ! 287: ! 288: if (vap->va_size != VNOVAL) { ! 289: if (vp->v_type == VDIR) ! 290: return EISDIR; ! 291: if (error = detrunc(dep, vap->va_size, 0)) ! 292: return error; ! 293: } ! 294: if (vap->va_mtime.tv_sec != VNOVAL) { ! 295: dep->de_flag |= DEUPD; ! 296: if (error = deupdat(dep, &vap->va_mtime, 1)) ! 297: return error; ! 298: } ! 299: ! 300: /* ! 301: * DOS files only have the ability to have thier ! 302: * writability attribute set, so we use the owner ! 303: * write bit to set the readonly attribute. ! 304: */ ! 305: if (vap->va_mode != (u_short)VNOVAL) { ! 306: /* We ignore the read and execute bits */ ! 307: if (vap->va_mode & VWRITE) ! 308: dep->de_Attributes &= ~ATTR_READONLY; ! 309: else ! 310: dep->de_Attributes |= ATTR_READONLY; ! 311: dep->de_flag |= DEUPD; ! 312: } ! 313: ! 314: if (vap->va_flags != VNOVAL) { ! 315: if (error = suser(cred, &p->p_acflag)) ! 316: return error; ! 317: if (cred->cr_uid == 0) ! 318: dep->de_flag = vap->va_flags; ! 319: else { ! 320: dep->de_flag &= 0xffff0000; ! 321: dep->de_flag |= (vap->va_flags & 0xffff); ! 322: } ! 323: dep->de_flag |= DEUPD; ! 324: } ! 325: return error; ! 326: } ! 327: ! 328: ! 329: int ! 330: pcfs_read(vp, uio, ioflag, cred) ! 331: struct vnode *vp; ! 332: struct uio *uio; ! 333: int ioflag; ! 334: struct ucred *cred; ! 335: { ! 336: int error = 0; ! 337: int diff; ! 338: int isadir; ! 339: long n; ! 340: long on; ! 341: daddr_t bn; ! 342: daddr_t lbn; ! 343: daddr_t rablock; ! 344: struct buf *bp; ! 345: struct denode *dep = VTODE(vp); ! 346: struct pcfsmount *pmp = dep->de_pmp; ! 347: ! 348: /* ! 349: * If they didn't ask for any data, then we ! 350: * are done. ! 351: */ ! 352: if (uio->uio_resid == 0) ! 353: return 0; ! 354: if (uio->uio_offset < 0) ! 355: return EINVAL; ! 356: ! 357: isadir = dep->de_Attributes & ATTR_DIRECTORY; ! 358: do { ! 359: lbn = uio->uio_offset >> pmp->pm_cnshift; ! 360: on = uio->uio_offset & pmp->pm_crbomask; ! 361: n = MIN((u_long)(pmp->pm_bpcluster - on), uio->uio_resid); ! 362: diff = dep->de_FileSize - uio->uio_offset; ! 363: if (diff <= 0) ! 364: return 0; ! 365: /* convert cluster # to block # if a directory */ ! 366: if (isadir) { ! 367: error = pcbmap(dep, lbn, &lbn, 0); ! 368: if (error) ! 369: return error; ! 370: } ! 371: if (diff < n) ! 372: n = diff; ! 373: /* ! 374: * If we are operating on a directory file then be ! 375: * sure to do i/o with the vnode for the filesystem ! 376: * instead of the vnode for the directory. ! 377: */ ! 378: if (isadir) { ! 379: error = bread(pmp->pm_devvp, lbn, pmp->pm_bpcluster, ! 380: NOCRED, &bp); ! 381: } else { ! 382: rablock = lbn + 1; ! 383: if (vp->v_lastr + 1 == lbn && ! 384: rablock * pmp->pm_bpcluster < dep->de_FileSize) { ! 385: error = breada(vp, lbn, pmp->pm_bpcluster, ! 386: rablock, pmp->pm_bpcluster, NOCRED, &bp); ! 387: } else { ! 388: error = bread(vp, lbn, pmp->pm_bpcluster, NOCRED, ! 389: &bp); ! 390: } ! 391: vp->v_lastr = lbn; ! 392: } ! 393: if (error) { ! 394: brelse(bp); ! 395: return error; ! 396: } ! 397: n = MIN(n, pmp->pm_bpcluster - bp->b_resid); ! 398: error = uiomove(bp->b_un.b_addr + on, (int)n, uio); ! 399: /* ! 400: * If we have read everything from this block or ! 401: * have read to end of file then we are done with ! 402: * this block. Mark it to say the buffer can be reused if ! 403: * need be. ! 404: */ ! 405: #if 0 ! 406: if (n + on == pmp->pm_bpcluster || ! 407: uio->uio_offset == dep->de_FileSize) ! 408: bp->b_flags |= B_AGE; ! 409: #endif ! 410: brelse(bp); ! 411: } while (error == 0 && uio->uio_resid > 0 && n != 0); ! 412: return error; ! 413: } ! 414: ! 415: /* ! 416: * Write data to a file or directory. ! 417: */ ! 418: int ! 419: pcfs_write(vp, uio, ioflag, cred) ! 420: struct vnode *vp; ! 421: struct uio *uio; ! 422: int ioflag; ! 423: struct ucred *cred; ! 424: { ! 425: int n; ! 426: int croffset; ! 427: int resid; ! 428: int osize; ! 429: int error; ! 430: u_long cluster; ! 431: u_long nextcluster; ! 432: u_long lastcluster; ! 433: daddr_t bn; ! 434: struct buf *bp; ! 435: struct proc *p = uio->uio_procp; ! 436: struct denode *dep = VTODE(vp); ! 437: struct pcfsmount *pmp = dep->de_pmp; ! 438: ! 439: #if defined(PCFSDEBUG) ! 440: printf("pcfs_write(vp %08x, uio %08x, ioflag %08x, cred %08x\n", ! 441: vp, uio, ioflag, cred); ! 442: printf("pcfs_write(): diroff %d, dirclust %d, startcluster %d\n", ! 443: dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); ! 444: #endif /* defined(PCFSDEBUG) */ ! 445: ! 446: switch (vp->v_type) { ! 447: case VREG: ! 448: if (ioflag & IO_APPEND) ! 449: uio->uio_offset = dep->de_FileSize; ! 450: break; ! 451: ! 452: case VDIR: ! 453: /* In pcfs, directory updates don't use pcfs_write */ ! 454: panic("pcfs_write(): directory update"); ! 455: break; ! 456: ! 457: default: ! 458: panic("pcfs_write(): bad file type"); ! 459: break; ! 460: } ! 461: ! 462: if (uio->uio_offset < 0) ! 463: return EINVAL; ! 464: if (uio->uio_resid == 0) ! 465: return 0; ! 466: ! 467: /* ! 468: * If they've exceeded their filesize limit, tell them about it. ! 469: */ ! 470: if (vp->v_type == VREG && p && ! 471: ((uio->uio_offset + uio->uio_resid) > ! 472: p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) { ! 473: psignal(p, SIGXFSZ); ! 474: return EFBIG; ! 475: } ! 476: ! 477: /* ! 478: * If the offset we are starting the write at is beyond the ! 479: * end of the file, then they've done a seek. Unix filesystems ! 480: * allow files with holes in them, DOS doesn't so we must ! 481: * fill the hole with zeroed blocks. ! 482: */ ! 483: if (uio->uio_offset > dep->de_FileSize) { ! 484: error = pcfsextend(vp, uio->uio_offset); ! 485: if (error) ! 486: return error; ! 487: } ! 488: ! 489: /* ! 490: * Remember some values in case the write fails. ! 491: */ ! 492: resid = uio->uio_resid; ! 493: osize = dep->de_FileSize; ! 494: ! 495: do { ! 496: bn = uio->uio_offset >> pmp->pm_cnshift; ! 497: croffset = uio->uio_offset & pmp->pm_crbomask; ! 498: n = MIN(uio->uio_resid, pmp->pm_bpcluster-croffset); ! 499: /* ! 500: * If we are appending to the file and we are on a ! 501: * cluster boundary, then allocate a new cluster ! 502: * and chain it onto the file. ! 503: */ ! 504: if (uio->uio_offset == dep->de_FileSize && ! 505: (uio->uio_offset & pmp->pm_crbomask) == 0) { ! 506: if (error = extendfile(dep, &bp, 0)) ! 507: break; ! 508: } else { ! 509: /* ! 510: * The block we need to write into exists, ! 511: * so just read it in. ! 512: */ ! 513: if (n == pmp->pm_bpcluster) ! 514: /* We will overwrite the whole block, so ! 515: * dont read it*/ ! 516: bp = getblk(vp, bn, pmp->pm_bpcluster); ! 517: else { ! 518: error = bread(vp, bn, pmp->pm_bpcluster, cred, &bp); ! 519: if (error) { ! 520: brelse(bp); ! 521: return error; ! 522: } ! 523: } ! 524: } ! 525: if (uio->uio_offset+n > dep->de_FileSize) { ! 526: dep->de_FileSize = uio->uio_offset + n; ! 527: vnode_pager_setsize(vp, dep->de_FileSize); ! 528: } ! 529: (void) vnode_pager_uncache(vp); ! 530: ! 531: /* ! 532: * Copy the data from user space into the buf header. ! 533: */ ! 534: error = uiomove(bp->b_un.b_addr+croffset, n, uio); ! 535: ! 536: /* ! 537: * If they want this synchronous then write it and wait ! 538: * for it. Otherwise, if on a cluster boundary write it ! 539: * asynchronously so we can move on to the next block ! 540: * without delay. Otherwise do a delayed write because ! 541: * we may want to write somemore into the block later. ! 542: */ ! 543: if (ioflag & IO_SYNC) ! 544: (void) bwrite(bp); ! 545: else ! 546: if (n + croffset == pmp->pm_bpcluster) { ! 547: bp->b_flags |= B_AGE; ! 548: bawrite(bp); ! 549: } else ! 550: bdwrite(bp); ! 551: dep->de_flag |= DEUPD; ! 552: } while (error == 0 && uio->uio_resid > 0); ! 553: ! 554: /* ! 555: * If the write failed and they want us to, truncate ! 556: * the file back to the size it was before the write ! 557: * was attempted. ! 558: */ ! 559: if (error && (ioflag & IO_UNIT)) { ! 560: detrunc(dep, osize, ioflag & IO_SYNC); ! 561: uio->uio_offset -= resid - uio->uio_resid; ! 562: uio->uio_resid = resid; ! 563: } ! 564: if (!error && (ioflag & IO_UNIT)) ! 565: error = deupdat(dep, &time, 1); ! 566: return error; ! 567: } ! 568: ! 569: int ! 570: pcfs_ioctl(vp, com, data, fflag, cred, p) ! 571: struct vnode *vp; ! 572: int com; ! 573: caddr_t data; ! 574: struct ucred *cred; ! 575: struct proc *p; ! 576: { ! 577: return ENOTTY; ! 578: } ! 579: ! 580: int ! 581: pcfs_select(vp, which, fflags, cred, p) ! 582: struct vnode *vp; ! 583: int which; ! 584: int fflags; ! 585: struct ucred *cred; ! 586: struct proc *p; ! 587: { ! 588: return 1; /* DOS filesystems never block? */ ! 589: } ! 590: ! 591: int ! 592: pcfs_mmap(vp, fflags, cred, p) ! 593: struct vnode *vp; ! 594: int fflags; ! 595: struct ucred *cred; ! 596: struct proc *p; ! 597: { ! 598: return EINVAL; ! 599: } ! 600: ! 601: /* ! 602: * Flush the blocks of a file to disk. ! 603: * ! 604: * This function is worthless for vnodes that represent ! 605: * directories. ! 606: * Maybe we could just do a sync if they try an fsync ! 607: * on a directory file. ! 608: */ ! 609: int ! 610: pcfs_fsync(vp, fflags, cred, waitfor, p) ! 611: struct vnode *vp; ! 612: int fflags; ! 613: struct ucred *cred; ! 614: int waitfor; ! 615: struct proc *p; ! 616: { ! 617: struct denode *dep = VTODE(vp); ! 618: ! 619: if (fflags & FWRITE) ! 620: dep->de_flag |= DEUPD; ! 621: ! 622: vflushbuf(vp, waitfor == MNT_WAIT ? B_SYNC : 0); ! 623: return deupdat(dep, &time, waitfor == MNT_WAIT); ! 624: } ! 625: ! 626: /* ! 627: * Since the dos filesystem does not allow files with ! 628: * holes in them we must fill the file with zeroed ! 629: * blocks when a write past the end of file happens. ! 630: */ ! 631: int ! 632: pcfsextend(vp, newoff) ! 633: struct vnode *vp; ! 634: off_t newoff; ! 635: { ! 636: int error = 0; ! 637: off_t foff; ! 638: struct buf *bp; ! 639: struct denode *dep = VTODE(vp); ! 640: struct pcfsmount *pmp = dep->de_pmp; ! 641: ! 642: #ifdef DIAGNOSTIC ! 643: if (dep->de_Attributes & ATTR_DIRECTORY) ! 644: /* should not happen */ ! 645: return EISDIR; ! 646: #endif ! 647: ! 648: /* ! 649: * Compute the offset of the first byte after the ! 650: * last block in the file. ! 651: * If writing beyond the end of file then fill the ! 652: * file with zeroed blocks up to the seek address. ! 653: */ ! 654: foff = (dep->de_FileSize + (pmp->pm_bpcluster-1)) & ~pmp->pm_crbomask; ! 655: if (newoff <= foff) ! 656: return 0; ! 657: ! 658: /* ! 659: * Allocate and chain together as many clusters as ! 660: * are needed to get to newoff. ! 661: */ ! 662: while (foff < newoff) { ! 663: if (error = extendfile(dep, &bp, 0)) ! 664: return error; ! 665: bdwrite(bp); ! 666: foff += pmp->pm_bpcluster; ! 667: dep->de_FileSize += pmp->pm_bpcluster; ! 668: } ! 669: dep->de_FileSize = newoff; ! 670: dep->de_flag |= DEUPD; ! 671: return deupdat(dep, &time); ! 672: } ! 673: ! 674: /* ! 675: * Seek on a file ! 676: * ! 677: * Nothing to do, so just return. ! 678: */ ! 679: int ! 680: pcfs_seek(vp, oldoff, newoff, cred) ! 681: struct vnode *vp; ! 682: off_t oldoff; ! 683: off_t newoff; ! 684: struct ucred *cred; ! 685: { ! 686: return 0; ! 687: } ! 688: ! 689: int ! 690: pcfs_remove(ndp, p) ! 691: struct nameidata *ndp; ! 692: struct proc *p; ! 693: { ! 694: int error; ! 695: struct denode *dep = VTODE(ndp->ni_vp); ! 696: struct denode *ddep = VTODE(ndp->ni_dvp); ! 697: ! 698: error = removede(ndp); ! 699: #if defined(PCFSDEBUG) ! 700: printf("pcfs_remove(), dep %08x, v_usecount %d\n", dep, ndp->ni_vp->v_usecount); ! 701: #endif /* defined(PCFSDEBUG) */ ! 702: if (ddep == dep) ! 703: vrele(DETOV(dep)); ! 704: else ! 705: deput(dep); /* causes pcfs_inactive() to be called via vrele() */ ! 706: deput(ddep); ! 707: return error; ! 708: } ! 709: ! 710: /* ! 711: * DOS filesystems don't know what links are. ! 712: */ ! 713: int ! 714: pcfs_link(vp, ndp, p) ! 715: struct vnode *vp; ! 716: struct nameidata *ndp; ! 717: struct proc *p; ! 718: { ! 719: return EINVAL; ! 720: } ! 721: ! 722: /* ! 723: * Renames on files require moving the denode to ! 724: * a new hash queue since the denode's location is ! 725: * used to compute which hash queue to put the file in. ! 726: * Unless it is a rename in place. For example "mv a b". ! 727: * ! 728: * What follows is the basic algorithm: ! 729: * ! 730: * if (file move) { ! 731: * if (dest file exists) { ! 732: * remove dest file ! 733: * } ! 734: * if (dest and src in same directory) { ! 735: * rewrite name in existing directory slot ! 736: * } else { ! 737: * write new entry in dest directory ! 738: * update offset and dirclust in denode ! 739: * move denode to new hash chain ! 740: * clear old directory entry ! 741: * } ! 742: * } else { directory move ! 743: * if (dest directory exists) { ! 744: * if (dest is not empty) { ! 745: * return ENOTEMPTY ! 746: * } ! 747: * remove dest directory ! 748: * } ! 749: * if (dest and src in same directory) { ! 750: * rewrite name in existing entry ! 751: * } else { ! 752: * be sure dest is not a child of src directory ! 753: * write entry in dest directory ! 754: * update "." and ".." in moved directory ! 755: * update offset and dirclust in denode ! 756: * move denode to new hash chain ! 757: * clear old directory entry for moved directory ! 758: * } ! 759: * } ! 760: * ! 761: * On entry: ! 762: * source's parent directory is unlocked ! 763: * source file or directory is unlocked ! 764: * destination's parent directory is locked ! 765: * destination file or directory is locked if it exists ! 766: * ! 767: * On exit: ! 768: * all denodes should be released ! 769: * Notes: ! 770: * I'm not sure how the memory containing the pathnames ! 771: * pointed at by the nameidata structures is freed, there ! 772: * may be some memory bleeding for each rename done. ! 773: */ ! 774: int ! 775: pcfs_rename(fndp, tndp, p) ! 776: struct nameidata *fndp; ! 777: struct nameidata *tndp; ! 778: struct proc *p; ! 779: { ! 780: u_char toname[11]; ! 781: int error; ! 782: int newparent = 0; ! 783: int sourceisadirectory = 0; ! 784: u_long to_dirclust; ! 785: u_long to_diroffset; ! 786: u_long cn; ! 787: daddr_t bn; ! 788: struct denode *fddep; /* from file's parent directory */ ! 789: struct denode *fdep; /* from file or directory */ ! 790: struct denode *tddep; /* to file's parent directory */ ! 791: struct denode *tdep; /* to file or directory */ ! 792: struct pcfsmount *pmp; ! 793: struct direntry *dotdotp; ! 794: struct direntry *ep; ! 795: struct buf *bp; ! 796: ! 797: #if defined(PCFSDEBUG) ! 798: printf("pcfs_rename(fndp %08x, tndp %08x, p %08x\n", fndp, tndp, p); ! 799: #endif /* defined(PCFSDEBUG) */ ! 800: fddep = VTODE(fndp->ni_dvp); ! 801: fdep = VTODE(fndp->ni_vp); ! 802: tddep = VTODE(tndp->ni_dvp); ! 803: tdep = tndp->ni_vp ? VTODE(tndp->ni_vp) : NULL; ! 804: pmp = fddep->de_pmp; ! 805: ! 806: /* ! 807: * Convert the filename in tdnp into a dos filename. ! 808: * We copy this into the denode and directory entry ! 809: * for the destination file/directory. ! 810: */ ! 811: unix2dosfn((u_char *)tndp->ni_ptr, toname, tndp->ni_namelen); ! 812: ! 813: /* ! 814: * At this point this is the lock state of the denodes: ! 815: * fddep referenced ! 816: * fdep referenced ! 817: * tddep locked ! 818: * tdep locked if it exists ! 819: */ ! 820: ! 821: /* ! 822: * Be sure we are not renaming ".", "..", or an alias of ".". ! 823: * This leads to a crippled directory tree. It's pretty tough ! 824: * to do a "ls" or "pwd" with the "." directory entry missing, ! 825: * and "cd .." doesn't work if the ".." entry is missing. ! 826: */ ! 827: if (fdep->de_Attributes & ATTR_DIRECTORY) { ! 828: if ((fndp->ni_namelen == 1 && fndp->ni_ptr[0] == '.') || ! 829: fddep == fdep || /* won't happen ? */ ! 830: fndp->ni_isdotdot) { ! 831: VOP_ABORTOP(tndp); ! 832: vput(tndp->ni_dvp); ! 833: if (tndp->ni_vp) ! 834: vput(tndp->ni_vp); ! 835: VOP_ABORTOP(fndp); ! 836: vrele(fndp->ni_dvp); ! 837: vrele(fndp->ni_vp); ! 838: return EINVAL; ! 839: } ! 840: sourceisadirectory = 1; ! 841: } ! 842: ! 843: /* ! 844: * If we are renaming a directory, and the directory ! 845: * is being moved to another directory, then we must ! 846: * be sure the destination directory is not in the ! 847: * subtree of the source directory. This could orphan ! 848: * everything under the source directory. ! 849: * doscheckpath() unlocks the destination's parent ! 850: * directory so we must look it up again to relock it. ! 851: */ ! 852: if (fddep->de_StartCluster != tddep->de_StartCluster) ! 853: newparent = 1; ! 854: if (sourceisadirectory && newparent) { ! 855: if (tdep) { ! 856: deput(tdep); ! 857: tdep = NULL; ! 858: } ! 859: /* doscheckpath() deput()'s tddep */ ! 860: error = doscheckpath(fdep, tddep, tndp->ni_cred); ! 861: tddep = NULL; ! 862: if (error) ! 863: goto bad; ! 864: if ((tndp->ni_nameiop & SAVESTART) == 0) ! 865: panic("pcfs_rename(): lost to startdir"); ! 866: if (error = lookup(tndp, p)) ! 867: goto bad; ! 868: tddep = VTODE(tndp->ni_dvp); ! 869: tdep = tndp->ni_vp ? VTODE(tndp->ni_vp) : NULL; ! 870: } ! 871: ! 872: /* ! 873: * If the destination exists, then be sure its type (file or dir) ! 874: * matches that of the source. And, if it is a directory make ! 875: * sure it is empty. Then delete the destination. ! 876: */ ! 877: if (tdep) { ! 878: if (tdep->de_Attributes & ATTR_DIRECTORY) { ! 879: if (!sourceisadirectory) { ! 880: error = ENOTDIR; ! 881: goto bad; ! 882: } ! 883: if (!dosdirempty(tdep)) { ! 884: error = ENOTEMPTY; ! 885: goto bad; ! 886: } ! 887: } else { /* destination is file */ ! 888: if (sourceisadirectory) { ! 889: error = EISDIR; ! 890: goto bad; ! 891: } ! 892: } ! 893: to_dirclust = tdep->de_dirclust; ! 894: to_diroffset = tdep->de_diroffset; ! 895: if (error = removede(tndp)) ! 896: goto bad; ! 897: deput(tdep); ! 898: tdep = NULL; ! 899: ! 900: /* ! 901: * Remember where the slot was for createde(). ! 902: */ ! 903: tndp->ni_pcfs.pcfs_count = 1; ! 904: tndp->ni_pcfs.pcfs_cluster = to_dirclust; ! 905: tndp->ni_pcfs.pcfs_offset = to_diroffset; ! 906: } ! 907: ! 908: /* ! 909: * If the source and destination are in the same ! 910: * directory then just read in the directory entry, ! 911: * change the name in the directory entry and ! 912: * write it back to disk. ! 913: */ ! 914: if (newparent == 0) { ! 915: /* tddep and fddep point to the same denode here */ ! 916: DELOCK(fdep); /* tddep is already locked */ ! 917: if (error = readde(fdep, &bp, &ep)) { ! 918: DEUNLOCK(fdep); ! 919: goto bad; ! 920: } ! 921: bcopy(toname, ep->deName, 11); ! 922: if (error = bwrite(bp)) { ! 923: DEUNLOCK(fdep); ! 924: goto bad; ! 925: } ! 926: bcopy(toname, fdep->de_Name, 11); /* update denode */ ! 927: /* ! 928: * fdep locked ! 929: * fddep and tddep point to the same denode which is locked ! 930: * tdep is unlocked and unreferenced ! 931: */ ! 932: } else { ! 933: u_long dirsize; ! 934: /* ! 935: * If the source and destination are in different ! 936: * directories, then mark the entry in the source ! 937: * directory as deleted and write a new entry in the ! 938: * destination directory. Then move the denode to ! 939: * the correct hash chain for its new location in ! 940: * the filesystem. And, if we moved a directory, ! 941: * then update its .. entry to point to the new ! 942: * parent directory. ! 943: * If we moved a directory will also insure that ! 944: * the directory entry on disk has a filesize of ! 945: * zero. ! 946: */ ! 947: DELOCK(fdep); ! 948: bcopy(toname, fdep->de_Name, 11); /* update denode */ ! 949: if (fdep->de_Attributes & ATTR_DIRECTORY) { ! 950: dirsize = fdep->de_FileSize; ! 951: fdep->de_FileSize = 0; ! 952: } ! 953: error = createde(fdep, tndp, (struct denode **)0); ! 954: if (fdep->de_Attributes & ATTR_DIRECTORY) { ! 955: fdep->de_FileSize = dirsize; ! 956: } ! 957: if (error) { ! 958: /* should put back filename */ ! 959: DEUNLOCK(fdep); ! 960: goto bad; ! 961: } ! 962: DELOCK(fddep); ! 963: error = markdeleted (pmp, ! 964: fndp->ni_pcfs.pcfs_cluster, ! 965: fndp->ni_pcfs.pcfs_offset); ! 966: if (error) { ! 967: DEUNLOCK(fdep); ! 968: DEUNLOCK(fddep); ! 969: goto bad; ! 970: } ! 971: if (!(fdep->de_Attributes & ATTR_DIRECTORY)) { ! 972: fdep->de_dirclust = tndp->ni_pcfs.pcfs_cluster; ! 973: fdep->de_diroffset = tndp->ni_pcfs.pcfs_offset; ! 974: reinsert(fdep); ! 975: } ! 976: DEUNLOCK(fddep); ! 977: } ! 978: /* fdep is still locked here */ ! 979: ! 980: /* ! 981: * If we moved a directory to a new parent directory, ! 982: * then we must fixup the ".." entry in the moved ! 983: * directory. ! 984: */ ! 985: if (sourceisadirectory && newparent) { ! 986: cn = fdep->de_StartCluster; ! 987: if (cn == PCFSROOT) ! 988: /* this should never happen */ ! 989: panic("pcfs_rename(): updating .. in root directory?\n"); ! 990: error = readep(pmp, cn, 1, &bp, &dotdotp); ! 991: if (error) { ! 992: /* should really panic here, fs is corrupt */ ! 993: DEUNLOCK(fdep); ! 994: goto bad; ! 995: } ! 996: dotdotp->deStartCluster = tddep->de_StartCluster; ! 997: error = bwrite(bp); ! 998: DEUNLOCK(fdep); ! 999: if (error) ! 1000: /* should really panic here, fs is corrupt */ ! 1001: goto bad; ! 1002: } ! 1003: else ! 1004: DEUNLOCK(fdep); ! 1005: bad:; ! 1006: vrele(DETOV(fdep)); ! 1007: vrele(DETOV(fddep)); ! 1008: if (tdep) ! 1009: vput(DETOV(tdep)); ! 1010: if (tddep) ! 1011: vput(DETOV(tddep)); ! 1012: return error; ! 1013: } ! 1014: ! 1015: struct { ! 1016: struct direntry dot; ! 1017: struct direntry dotdot; ! 1018: } dosdirtemplate = { ! 1019: ". ", " ", /* the . entry */ ! 1020: ATTR_DIRECTORY, /* file attribute */ ! 1021: 0,0,0,0,0,0,0,0,0,0, /* resevered */ ! 1022: 1234, 1234, /* time and date */ ! 1023: 0, /* startcluster */ ! 1024: 0, /* filesize */ ! 1025: ".. ", " ", /* the .. entry */ ! 1026: ATTR_DIRECTORY, /* file attribute */ ! 1027: 0,0,0,0,0,0,0,0,0,0, /* resevered */ ! 1028: 1234, 1234, /* time and date */ ! 1029: 0, /* startcluster */ ! 1030: 0, /* filesize */ ! 1031: }; ! 1032: ! 1033: int ! 1034: pcfs_mkdir(ndp, vap, p) ! 1035: struct nameidata *ndp; ! 1036: struct vattr *vap; ! 1037: struct proc *p; ! 1038: { ! 1039: int bn; ! 1040: int error; ! 1041: u_long newcluster; ! 1042: struct denode *pdep; ! 1043: struct denode *ndep; ! 1044: struct vnode *pvp; ! 1045: struct direntry *denp; ! 1046: struct denode ndirent; ! 1047: struct pcfsmount *pmp; ! 1048: struct buf *bp; ! 1049: ! 1050: pvp = ndp->ni_dvp; ! 1051: pdep = VTODE(pvp); ! 1052: ! 1053: /* ! 1054: * If this is the root directory and there is no space left ! 1055: * we can't do anything. This is because the root directory ! 1056: * can not change size. ! 1057: */ ! 1058: if (pdep->de_StartCluster == PCFSROOT && ndp->ni_pcfs.pcfs_count == 0) { ! 1059: free(ndp->ni_pnbuf, M_NAMEI); ! 1060: deput(pdep); ! 1061: return ENOSPC; ! 1062: } ! 1063: ! 1064: pmp = pdep->de_pmp; ! 1065: ! 1066: /* ! 1067: * Allocate a cluster to hold the about to be created directory. ! 1068: */ ! 1069: if (error = clusteralloc(pmp, &newcluster, CLUST_EOFE)) { ! 1070: free(ndp->ni_pnbuf, M_NAMEI); ! 1071: deput(pdep); ! 1072: return error; ! 1073: } ! 1074: ! 1075: /* ! 1076: * Now fill the cluster with the "." and ".." entries. ! 1077: * And write the cluster to disk. This way it is there ! 1078: * for the parent directory to be pointing at if there ! 1079: * were a crash. ! 1080: */ ! 1081: bn = cntobn(pmp, newcluster); ! 1082: bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster); /* always succeeds */ ! 1083: clrbuf(bp); ! 1084: bcopy(&dosdirtemplate, bp->b_un.b_addr, sizeof dosdirtemplate); ! 1085: denp = (struct direntry *)bp->b_un.b_addr; ! 1086: denp->deStartCluster = newcluster; ! 1087: unix2dostime(&time, (union dosdate *)&denp->deDate, ! 1088: (union dostime *)&denp->deTime); ! 1089: denp++; ! 1090: denp->deStartCluster = pdep->de_StartCluster; ! 1091: unix2dostime(&time, (union dosdate *)&denp->deDate, ! 1092: (union dostime *)&denp->deTime); ! 1093: if (error = bwrite(bp)) { ! 1094: clusterfree(pmp, newcluster, NULL); ! 1095: free(ndp->ni_pnbuf, M_NAMEI); ! 1096: deput(pdep); ! 1097: return error; ! 1098: } ! 1099: ! 1100: /* ! 1101: * Now build up a directory entry pointing to the newly ! 1102: * allocated cluster. This will be written to an empty ! 1103: * slot in the parent directory. ! 1104: */ ! 1105: ndep = &ndirent; ! 1106: bzero(ndep, sizeof(*ndep)); ! 1107: unix2dosfn((u_char *)ndp->ni_ptr, ndep->de_Name, ndp->ni_namelen); ! 1108: unix2dostime(&time, (union dosdate *)&ndep->de_Date, ! 1109: (union dostime *)&ndep->de_Time); ! 1110: ndep->de_StartCluster = newcluster; ! 1111: ndep->de_Attributes = ATTR_DIRECTORY; ! 1112: ndep->de_pmp = pmp; /* createde() needs this */ ! 1113: ! 1114: error = createde(ndep, ndp, &ndep); ! 1115: if (error) { ! 1116: clusterfree(pmp, newcluster, NULL); ! 1117: } else { ! 1118: ndp->ni_vp = DETOV(ndep); ! 1119: } ! 1120: free(ndp->ni_pnbuf, M_NAMEI); ! 1121: #if defined(PCFSDEBUG) ! 1122: printf("pcfs_mkdir(): deput(%08x), vnode %08x\n", pdep, DETOV(pdep)); ! 1123: #endif /* defined(PCFSDEBUG) */ ! 1124: deput(pdep); ! 1125: return error; ! 1126: } ! 1127: ! 1128: int ! 1129: pcfs_rmdir(ndp, p) ! 1130: struct nameidata *ndp; ! 1131: struct proc *p; ! 1132: { ! 1133: struct denode *ddep; ! 1134: struct denode *dep; ! 1135: int error = 0; ! 1136: ! 1137: ddep = VTODE(ndp->ni_dvp); /* parent dir of dir to delete */ ! 1138: dep = VTODE(ndp->ni_vp); /* directory to delete */ ! 1139: ! 1140: /* ! 1141: * Don't let "rmdir ." go thru. ! 1142: */ ! 1143: if (ddep == dep) { ! 1144: vrele(DETOV(dep)); ! 1145: deput(dep); ! 1146: return EINVAL; ! 1147: } ! 1148: ! 1149: /* ! 1150: * Be sure the directory being deleted is empty. ! 1151: */ ! 1152: if (dosdirempty(dep) == 0) { ! 1153: error = ENOTEMPTY; ! 1154: goto out; ! 1155: } ! 1156: ! 1157: /* ! 1158: * Delete the entry from the directory. For dos filesystems ! 1159: * this gets rid of the directory entry on disk, the in memory ! 1160: * copy still exists but the de_refcnt is <= 0. This prevents ! 1161: * it from being found by deget(). When the deput() on dep is ! 1162: * done we give up access and eventually pcfs_reclaim() will ! 1163: * be called which will remove it from the denode cache. ! 1164: */ ! 1165: if (error = removede(ndp)) ! 1166: goto out; ! 1167: ! 1168: /* ! 1169: * This is where we decrement the link count in the parent ! 1170: * directory. Since dos filesystems don't do this we just ! 1171: * purge the name cache and let go of the parent directory ! 1172: * denode. ! 1173: */ ! 1174: cache_purge(DETOV(ddep)); ! 1175: deput(ddep); ! 1176: ndp->ni_dvp = NULL; /* getting rid of parent dir pointer? */ ! 1177: ! 1178: /* ! 1179: * Truncate the directory that is being deleted. ! 1180: */ ! 1181: error = detrunc(dep, (u_long)0, IO_SYNC); ! 1182: cache_purge(DETOV(dep)); ! 1183: ! 1184: out:; ! 1185: if (ndp->ni_dvp) ! 1186: deput(ddep); ! 1187: deput(dep); ! 1188: return error; ! 1189: } ! 1190: ! 1191: /* ! 1192: * DOS filesystems don't know what symlinks are. ! 1193: */ ! 1194: int ! 1195: pcfs_symlink(ndp, vap, target, p) ! 1196: struct nameidata *ndp; ! 1197: struct vattr *vap; ! 1198: char *target; ! 1199: struct proc *p; ! 1200: { ! 1201: return EINVAL; ! 1202: } ! 1203: ! 1204: /* ! 1205: * Dummy dirents to simulate the "." and ".." entries ! 1206: * of the root directory in a dos filesystem. Dos doesn't ! 1207: * provide these. ! 1208: * Note that each entry must be the same size as a dos ! 1209: * directory entry (32 bytes). ! 1210: */ ! 1211: struct dos_dirent { ! 1212: u_long d_fileno; ! 1213: u_short d_reclen; ! 1214: u_short d_namlen; ! 1215: u_char d_name[24]; ! 1216: } rootdots[2] = { ! 1217: { ! 1218: 1, /* d_fileno */ ! 1219: sizeof(struct direntry), /* d_reclen */ ! 1220: 1, /* d_namlen */ ! 1221: "." /* d_name */ ! 1222: }, ! 1223: { ! 1224: 1, /* d_fileno */ ! 1225: sizeof(struct direntry), /* d_reclen */ ! 1226: 2, /* d_namlen */ ! 1227: ".." /* d_name */ ! 1228: } ! 1229: }; ! 1230: ! 1231: int ! 1232: pcfs_readdir(vp, uio, cred, eofflagp) ! 1233: struct vnode *vp; ! 1234: struct uio *uio; ! 1235: struct ucred *cred; ! 1236: int *eofflagp; ! 1237: { ! 1238: int error = 0; ! 1239: int diff; ! 1240: char pushout; ! 1241: long n; ! 1242: long on; ! 1243: long lost; ! 1244: long count; ! 1245: u_long cn; ! 1246: u_long fileno; ! 1247: long bias = 0; ! 1248: daddr_t bn; ! 1249: daddr_t lbn; ! 1250: struct buf *bp; ! 1251: struct denode *dep = VTODE(vp); ! 1252: struct pcfsmount *pmp = dep->de_pmp; ! 1253: struct direntry *dentp; ! 1254: struct dirent *prev; ! 1255: struct dirent *crnt; ! 1256: u_char dirbuf[512]; /* holds converted dos directories */ ! 1257: int i=0; ! 1258: ! 1259: #if defined(PCFSDEBUG) ! 1260: printf("pcfs_readdir(): vp %08x, uio %08x, cred %08x, eofflagp %08x\n", ! 1261: vp, uio, cred, eofflagp); ! 1262: #endif /* defined(PCFSDEBUG) */ ! 1263: ! 1264: /* ! 1265: * pcfs_readdir() won't operate properly on regular files ! 1266: * since it does i/o only with the the filesystem vnode, ! 1267: * and hence can retrieve the wrong block from the buffer ! 1268: * cache for a plain file. So, fail attempts to readdir() ! 1269: * on a plain file. ! 1270: */ ! 1271: if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) ! 1272: return ENOTDIR; ! 1273: ! 1274: /* ! 1275: * If the user buffer is smaller than the size of one dos ! 1276: * directory entry or the file offset is not a multiple of ! 1277: * the size of a directory entry, then we fail the read. ! 1278: */ ! 1279: count = uio->uio_resid & ~(sizeof(struct direntry)-1); ! 1280: lost = uio->uio_resid - count; ! 1281: if (count < sizeof(struct direntry) || ! 1282: (uio->uio_offset & (sizeof(struct direntry)-1))) ! 1283: return EINVAL; ! 1284: uio->uio_resid = count; ! 1285: uio->uio_iov->iov_len = count; ! 1286: ! 1287: /* ! 1288: * If they are reading from the root directory then, ! 1289: * we simulate the . and .. entries since these don't ! 1290: * exist in the root directory. We also set the offset ! 1291: * bias to make up for having to simulate these entries. ! 1292: * By this I mean that at file offset 64 we read the first entry ! 1293: * in the root directory that lives on disk. ! 1294: */ ! 1295: if (dep->de_StartCluster == PCFSROOT) { ! 1296: /*printf("pcfs_readdir(): going after . or .. in root dir, offset %d\n", ! 1297: uio->uio_offset);*/ ! 1298: bias = 2*sizeof(struct direntry); ! 1299: if (uio->uio_offset < 2*sizeof(struct direntry)) { ! 1300: error = uiomove((char *)rootdots + uio->uio_offset, ! 1301: sizeof rootdots - uio->uio_offset, uio); ! 1302: if (error) ! 1303: goto out; ! 1304: } ! 1305: } ! 1306: do { ! 1307: lbn = (uio->uio_offset-bias) >> pmp->pm_cnshift; ! 1308: on = (uio->uio_offset-bias) & pmp->pm_crbomask; ! 1309: n = MIN((u_long)(pmp->pm_bpcluster - on), uio->uio_resid); ! 1310: diff = dep->de_FileSize - (uio->uio_offset - bias); ! 1311: if (diff <= 0) ! 1312: return 0; ! 1313: if (diff < n) ! 1314: n = diff; ! 1315: error = pcbmap(dep, lbn, &bn, &cn); ! 1316: if (error) ! 1317: break; ! 1318: error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, NOCRED, &bp); ! 1319: if (error) { ! 1320: brelse(bp); ! 1321: return error; ! 1322: } ! 1323: n = MIN(n, pmp->pm_bpcluster - bp->b_resid); ! 1324: ! 1325: /* ! 1326: * code to convert from dos directory entries to ufs directory entries ! 1327: */ ! 1328: pushout = 0; ! 1329: dentp = (struct direntry *)(bp->b_un.b_addr + on); ! 1330: prev = 0; ! 1331: crnt = (struct dirent *)dirbuf; ! 1332: while ((char *)dentp < bp->b_un.b_addr + on + n) { ! 1333: /*printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", ! 1334: dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);*/ ! 1335: /* ! 1336: * If we have an empty entry or a slot from a deleted ! 1337: * file, or a volume label entry just concatenate its ! 1338: * space onto the end of the previous entry or, ! 1339: * manufacture an empty entry if there is no previous ! 1340: * entry. ! 1341: */ ! 1342: if (dentp->deName[0] == SLOT_EMPTY || ! 1343: dentp->deName[0] == SLOT_DELETED || ! 1344: (dentp->deAttributes & ATTR_VOLUME)) { ! 1345: if (prev) { ! 1346: prev->d_reclen += sizeof(struct direntry); ! 1347: } else { ! 1348: prev = crnt; ! 1349: prev->d_fileno = 0; ! 1350: prev->d_reclen = sizeof(struct direntry); ! 1351: prev->d_namlen = 0; ! 1352: prev->d_name[0] = 0; ! 1353: } ! 1354: } else { ! 1355: /* this computation of d_fileno must match ! 1356: * the computation of va_fileid in pcfs_getattr */ ! 1357: if (dentp->deAttributes & ATTR_DIRECTORY) { ! 1358: /* if this is the root directory */ ! 1359: if ((fileno = dentp->deStartCluster) == PCFSROOT) ! 1360: fileno = 1; ! 1361: } else { ! 1362: /* if the file's dirent lives in root dir */ ! 1363: if ((fileno = cn) == PCFSROOT) ! 1364: fileno = 1; ! 1365: fileno = (fileno << 16) | ! 1366: ((dentp - (struct direntry *)bp->b_un.b_addr) & 0xffff); ! 1367: } ! 1368: crnt->d_fileno = fileno; ! 1369: crnt->d_reclen = sizeof(struct direntry); ! 1370: crnt->d_namlen = dos2unixfn(dentp->deName, ! 1371: (u_char *)crnt->d_name); ! 1372: /*printf("readdir: file %s, fileno %08x, attr %02x, start %08x\n", ! 1373: crnt->d_name, crnt->d_fileno, dentp->deAttributes, dentp->deStartCluster);*/ ! 1374: prev = crnt; ! 1375: } ! 1376: crnt = (struct dirent *)((char *)crnt + sizeof(struct direntry)); ! 1377: pushout = 1; ! 1378: ! 1379: /* ! 1380: * If our intermediate buffer is full then copy ! 1381: * its contents to user space. ! 1382: */ ! 1383: if ((u_char *)crnt >= &dirbuf[sizeof dirbuf]) { ! 1384: pushout = 0; ! 1385: error = uiomove(dirbuf, sizeof(dirbuf), uio); ! 1386: if (error) ! 1387: break; ! 1388: prev = 0; ! 1389: crnt = (struct dirent *)dirbuf; ! 1390: } ! 1391: dentp++; ! 1392: } ! 1393: if (pushout) { ! 1394: pushout = 0; ! 1395: error = uiomove(dirbuf, (char *)crnt - (char *)dirbuf, ! 1396: uio); ! 1397: } ! 1398: ! 1399: /* ! 1400: * If we have read everything from this block or ! 1401: * have read to end of file then we are done with ! 1402: * this block. Mark it to say the buffer can be reused if ! 1403: * need be. ! 1404: */ ! 1405: #if 0 ! 1406: if (n + on == pmp->pm_bpcluster || ! 1407: (uio->uio_offset-bias) == dep->de_FileSize) ! 1408: bp->b_flags |= B_AGE; ! 1409: #endif ! 1410: brelse(bp); ! 1411: } while (error == 0 && uio->uio_resid > 0 && n != 0); ! 1412: out:; ! 1413: uio->uio_resid += lost; ! 1414: ! 1415: /* ! 1416: * I don't know why we bother setting this eofflag, getdirentries() ! 1417: * in vfs_syscalls.c doesn't bother to look at it when we return. ! 1418: * But nfsrv_readdir does. ! 1419: */ ! 1420: if (dep->de_FileSize - uio->uio_offset - bias <= 0) ! 1421: *eofflagp = 1; ! 1422: else ! 1423: *eofflagp = 0; ! 1424: return error; ! 1425: } ! 1426: ! 1427: /* ! 1428: * DOS filesystems don't know what symlinks are. ! 1429: */ ! 1430: int ! 1431: pcfs_readlink(vp, uio, cred) ! 1432: struct vnode *vp; ! 1433: struct uio *uio; ! 1434: struct ucred *cred; ! 1435: { ! 1436: return EINVAL; ! 1437: } ! 1438: ! 1439: int ! 1440: pcfs_abortop(ndp) ! 1441: struct nameidata *ndp; ! 1442: { ! 1443: if ((ndp->ni_nameiop & (HASBUF | SAVESTART)) == HASBUF) ! 1444: FREE(ndp->ni_pnbuf, M_NAMEI); ! 1445: return 0; ! 1446: } ! 1447: ! 1448: int ! 1449: pcfs_lock(vp) ! 1450: struct vnode *vp; ! 1451: { ! 1452: struct denode *dep = VTODE(vp); ! 1453: ! 1454: DELOCK(dep); ! 1455: return 0; ! 1456: } ! 1457: ! 1458: int ! 1459: pcfs_unlock(vp) ! 1460: struct vnode *vp; ! 1461: { ! 1462: struct denode *dep = VTODE(vp); ! 1463: ! 1464: if (!(dep->de_flag & DELOCKED)) ! 1465: panic("pcfs_unlock: denode not locked"); ! 1466: DEUNLOCK(dep); ! 1467: return 0; ! 1468: } ! 1469: ! 1470: int ! 1471: pcfs_islocked(vp) ! 1472: struct vnode *vp; ! 1473: { ! 1474: return VTODE(vp)->de_flag & DELOCKED ? 1 : 0; ! 1475: } ! 1476: ! 1477: /* ! 1478: * vp - address of vnode file the file ! 1479: * bn - which cluster we are interested in mapping to ! 1480: * a filesystem block number. ! 1481: * vpp - returns the vnode for the block special file ! 1482: * holding the filesystem containing the file of interest ! 1483: * bnp - address of where to return the filesystem ! 1484: * relative block number ! 1485: */ ! 1486: int ! 1487: pcfs_bmap(vp, bn, vpp, bnp) ! 1488: struct vnode *vp; ! 1489: daddr_t bn; ! 1490: struct vnode **vpp; ! 1491: daddr_t *bnp; ! 1492: { ! 1493: struct denode *dep = VTODE(vp); ! 1494: struct pcfsmount *pmp = dep->de_pmp; ! 1495: ! 1496: if (vpp != NULL) ! 1497: *vpp = dep->de_devvp; ! 1498: if (bnp == NULL) ! 1499: return 0; ! 1500: return pcbmap(dep, bn << (pmp->pm_cnshift - pmp->pm_bnshift), bnp, 0); ! 1501: } ! 1502: ! 1503: int ! 1504: pcfs_strategy(bp) ! 1505: struct buf *bp; ! 1506: { ! 1507: struct denode *dep = VTODE(bp->b_vp); ! 1508: struct pcfsmount *pmp = dep->de_pmp; ! 1509: struct vnode *vp; ! 1510: int error; ! 1511: ! 1512: if (bp->b_vp->v_type == VBLK || bp->b_vp->v_type == VCHR) ! 1513: panic("pcfs_strategy: spec"); ! 1514: /* ! 1515: * If we don't already know the filesystem relative ! 1516: * block number then get it using pcbmap(). If pcbmap() ! 1517: * returns the block number as -1 then we've got a hole ! 1518: * in the file. DOS filesystems don't allow files with ! 1519: * holes, so we shouldn't ever see this. ! 1520: */ ! 1521: if (bp->b_blkno == bp->b_lblkno) { ! 1522: if (error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno, 0)) ! 1523: return error; ! 1524: if ((long)bp->b_blkno == -1) ! 1525: clrbuf(bp); ! 1526: } ! 1527: if ((long)bp->b_blkno == -1) { ! 1528: biodone(bp); ! 1529: return 0; ! 1530: } ! 1531: #ifdef DIAGNOSTIC ! 1532: #endif /* defined(DIAGNOSTIC) */ ! 1533: /* ! 1534: * Read/write the block from/to the disk that contains the desired ! 1535: * file block. ! 1536: */ ! 1537: vp = dep->de_devvp; ! 1538: bp->b_dev = vp->v_rdev; ! 1539: (*(vp->v_op->vop_strategy))(bp); ! 1540: return 0; ! 1541: } ! 1542: ! 1543: int ! 1544: pcfs_print(vp) ! 1545: struct vnode *vp; ! 1546: { ! 1547: struct denode *dep = VTODE(vp); ! 1548: ! 1549: printf("tag VT_MSDOSFS, startcluster %d, dircluster %d, diroffset %d ", ! 1550: dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); ! 1551: printf(" dev %d, %d, %s\n", ! 1552: major(dep->de_dev), minor(dep->de_dev), ! 1553: dep->de_flag & DELOCKED ? "(LOCKED)" : ""); ! 1554: if (dep->de_spare0) { ! 1555: printf(" owner pid %d", dep->de_spare0); ! 1556: if (dep->de_spare1) ! 1557: printf(" waiting pid %d", dep->de_spare1); ! 1558: printf("\n"); ! 1559: } ! 1560: } ! 1561: ! 1562: int ! 1563: pcfs_advlock(vp, id, op, fl, flags) ! 1564: struct vnode *vp; ! 1565: caddr_t id; ! 1566: int op; ! 1567: struct flock *fl; ! 1568: int flags; ! 1569: { ! 1570: return EINVAL; /* we don't do locking yet */ ! 1571: } ! 1572: ! 1573: struct vnodeops pcfs_vnodeops = { ! 1574: pcfs_lookup, ! 1575: pcfs_create, ! 1576: pcfs_mknod, ! 1577: pcfs_open, ! 1578: pcfs_close, ! 1579: pcfs_access, ! 1580: pcfs_getattr, ! 1581: pcfs_setattr, ! 1582: pcfs_read, ! 1583: pcfs_write, ! 1584: pcfs_ioctl, ! 1585: pcfs_select, ! 1586: pcfs_mmap, ! 1587: pcfs_fsync, ! 1588: pcfs_seek, ! 1589: pcfs_remove, ! 1590: pcfs_link, ! 1591: pcfs_rename, ! 1592: pcfs_mkdir, ! 1593: pcfs_rmdir, ! 1594: pcfs_symlink, ! 1595: pcfs_readdir, ! 1596: pcfs_readlink, ! 1597: pcfs_abortop, ! 1598: pcfs_inactive, ! 1599: pcfs_reclaim, ! 1600: pcfs_lock, ! 1601: pcfs_unlock, ! 1602: pcfs_bmap, ! 1603: pcfs_strategy, ! 1604: pcfs_print, ! 1605: pcfs_islocked, ! 1606: pcfs_advlock, ! 1607: };
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