1 /* 2 * Copyright (c) 1989, 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)ffs_vfsops.c 8.11 (Berkeley) 07/14/94 8 */ 9 10 #include <sys/param.h> 11 #include <sys/systm.h> 12 #include <sys/namei.h> 13 #include <sys/proc.h> 14 #include <sys/kernel.h> 15 #include <sys/vnode.h> 16 #include <sys/socket.h> 17 #include <sys/mount.h> 18 #include <sys/buf.h> 19 #include <sys/mbuf.h> 20 #include <sys/file.h> 21 #include <sys/disklabel.h> 22 #include <sys/ioctl.h> 23 #include <sys/errno.h> 24 #include <sys/malloc.h> 25 26 #include <miscfs/specfs/specdev.h> 27 28 #include <ufs/ufs/quota.h> 29 #include <ufs/ufs/ufsmount.h> 30 #include <ufs/ufs/inode.h> 31 #include <ufs/ufs/ufs_extern.h> 32 33 #include <ufs/ffs/fs.h> 34 #include <ufs/ffs/ffs_extern.h> 35 36 int ffs_sbupdate __P((struct ufsmount *, int)); 37 38 struct vfsops ufs_vfsops = { 39 ffs_mount, 40 ufs_start, 41 ffs_unmount, 42 ufs_root, 43 ufs_quotactl, 44 ffs_statfs, 45 ffs_sync, 46 ffs_vget, 47 ffs_fhtovp, 48 ffs_vptofh, 49 ffs_init, 50 }; 51 52 extern u_long nextgennumber; 53 54 /* 55 * Called by main() when ufs is going to be mounted as root. 56 * 57 * Name is updated by mount(8) after booting. 58 */ 59 #define ROOTNAME "root_device" 60 61 ffs_mountroot() 62 { 63 extern struct vnode *rootvp; 64 register struct fs *fs; 65 register struct mount *mp; 66 struct proc *p = curproc; /* XXX */ 67 struct ufsmount *ump; 68 u_int size; 69 int error; 70 71 /* 72 * Get vnodes for swapdev and rootdev. 73 */ 74 if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp)) 75 panic("ffs_mountroot: can't setup bdevvp's"); 76 77 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 78 bzero((char *)mp, (u_long)sizeof(struct mount)); 79 mp->mnt_op = &ufs_vfsops; 80 mp->mnt_flag = MNT_RDONLY; 81 if (error = ffs_mountfs(rootvp, mp, p)) { 82 free(mp, M_MOUNT); 83 return (error); 84 } 85 if (error = vfs_lock(mp)) { 86 (void)ffs_unmount(mp, 0, p); 87 free(mp, M_MOUNT); 88 return (error); 89 } 90 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 91 mp->mnt_flag |= MNT_ROOTFS; 92 mp->mnt_vnodecovered = NULLVP; 93 ump = VFSTOUFS(mp); 94 fs = ump->um_fs; 95 bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt)); 96 fs->fs_fsmnt[0] = '/'; 97 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 98 MNAMELEN); 99 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 100 &size); 101 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 102 (void)ffs_statfs(mp, &mp->mnt_stat, p); 103 vfs_unlock(mp); 104 inittodr(fs->fs_time); 105 return (0); 106 } 107 108 /* 109 * VFS Operations. 110 * 111 * mount system call 112 */ 113 int 114 ffs_mount(mp, path, data, ndp, p) 115 register struct mount *mp; 116 char *path; 117 caddr_t data; 118 struct nameidata *ndp; 119 struct proc *p; 120 { 121 struct vnode *devvp; 122 struct ufs_args args; 123 struct ufsmount *ump; 124 register struct fs *fs; 125 u_int size; 126 int error, flags; 127 mode_t accessmode; 128 129 if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args))) 130 return (error); 131 /* 132 * If updating, check whether changing from read-only to 133 * read/write; if there is no device name, that's all we do. 134 */ 135 if (mp->mnt_flag & MNT_UPDATE) { 136 ump = VFSTOUFS(mp); 137 fs = ump->um_fs; 138 error = 0; 139 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 140 flags = WRITECLOSE; 141 if (mp->mnt_flag & MNT_FORCE) 142 flags |= FORCECLOSE; 143 if (vfs_busy(mp)) 144 return (EBUSY); 145 error = ffs_flushfiles(mp, flags, p); 146 vfs_unbusy(mp); 147 } 148 if (!error && (mp->mnt_flag & MNT_RELOAD)) 149 error = ffs_reload(mp, ndp->ni_cnd.cn_cred, p); 150 if (error) 151 return (error); 152 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) { 153 /* 154 * If upgrade to read-write by non-root, then verify 155 * that user has necessary permissions on the device. 156 */ 157 if (p->p_ucred->cr_uid != 0) { 158 devvp = ump->um_devvp; 159 VOP_LOCK(devvp); 160 if (error = VOP_ACCESS(devvp, VREAD | VWRITE, 161 p->p_ucred, p)) { 162 VOP_UNLOCK(devvp); 163 return (error); 164 } 165 VOP_UNLOCK(devvp); 166 } 167 fs->fs_ronly = 0; 168 } 169 if (args.fspec == 0) { 170 /* 171 * Process export requests. 172 */ 173 return (vfs_export(mp, &ump->um_export, &args.export)); 174 } 175 } 176 /* 177 * Not an update, or updating the name: look up the name 178 * and verify that it refers to a sensible block device. 179 */ 180 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 181 if (error = namei(ndp)) 182 return (error); 183 devvp = ndp->ni_vp; 184 185 if (devvp->v_type != VBLK) { 186 vrele(devvp); 187 return (ENOTBLK); 188 } 189 if (major(devvp->v_rdev) >= nblkdev) { 190 vrele(devvp); 191 return (ENXIO); 192 } 193 /* 194 * If mount by non-root, then verify that user has necessary 195 * permissions on the device. 196 */ 197 if (p->p_ucred->cr_uid != 0) { 198 accessmode = VREAD; 199 if ((mp->mnt_flag & MNT_RDONLY) == 0) 200 accessmode |= VWRITE; 201 VOP_LOCK(devvp); 202 if (error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p)) { 203 vput(devvp); 204 return (error); 205 } 206 VOP_UNLOCK(devvp); 207 } 208 if ((mp->mnt_flag & MNT_UPDATE) == 0) 209 error = ffs_mountfs(devvp, mp, p); 210 else { 211 if (devvp != ump->um_devvp) 212 error = EINVAL; /* needs translation */ 213 else 214 vrele(devvp); 215 } 216 if (error) { 217 vrele(devvp); 218 return (error); 219 } 220 ump = VFSTOUFS(mp); 221 fs = ump->um_fs; 222 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 223 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 224 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 225 MNAMELEN); 226 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 227 &size); 228 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 229 (void)ffs_statfs(mp, &mp->mnt_stat, p); 230 return (0); 231 } 232 233 /* 234 * Reload all incore data for a filesystem (used after running fsck on 235 * the root filesystem and finding things to fix). The filesystem must 236 * be mounted read-only. 237 * 238 * Things to do to update the mount: 239 * 1) invalidate all cached meta-data. 240 * 2) re-read superblock from disk. 241 * 3) re-read summary information from disk. 242 * 4) invalidate all inactive vnodes. 243 * 5) invalidate all cached file data. 244 * 6) re-read inode data for all active vnodes. 245 */ 246 ffs_reload(mountp, cred, p) 247 register struct mount *mountp; 248 struct ucred *cred; 249 struct proc *p; 250 { 251 register struct vnode *vp, *nvp, *devvp; 252 struct inode *ip; 253 struct csum *space; 254 struct buf *bp; 255 struct fs *fs; 256 int i, blks, size, error; 257 258 if ((mountp->mnt_flag & MNT_RDONLY) == 0) 259 return (EINVAL); 260 /* 261 * Step 1: invalidate all cached meta-data. 262 */ 263 devvp = VFSTOUFS(mountp)->um_devvp; 264 if (vinvalbuf(devvp, 0, cred, p, 0, 0)) 265 panic("ffs_reload: dirty1"); 266 /* 267 * Step 2: re-read superblock from disk. 268 */ 269 if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) 270 return (error); 271 fs = (struct fs *)bp->b_data; 272 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 273 fs->fs_bsize < sizeof(struct fs)) { 274 brelse(bp); 275 return (EIO); /* XXX needs translation */ 276 } 277 fs = VFSTOUFS(mountp)->um_fs; 278 bcopy(&fs->fs_csp[0], &((struct fs *)bp->b_data)->fs_csp[0], 279 sizeof(fs->fs_csp)); 280 bcopy(bp->b_data, fs, (u_int)fs->fs_sbsize); 281 if (fs->fs_sbsize < SBSIZE) 282 bp->b_flags |= B_INVAL; 283 brelse(bp); 284 mountp->mnt_maxsymlinklen = fs->fs_maxsymlinklen; 285 ffs_oldfscompat(fs); 286 /* 287 * Step 3: re-read summary information from disk. 288 */ 289 blks = howmany(fs->fs_cssize, fs->fs_fsize); 290 space = fs->fs_csp[0]; 291 for (i = 0; i < blks; i += fs->fs_frag) { 292 size = fs->fs_bsize; 293 if (i + fs->fs_frag > blks) 294 size = (blks - i) * fs->fs_fsize; 295 if (error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size, 296 NOCRED, &bp)) 297 return (error); 298 bcopy(bp->b_data, fs->fs_csp[fragstoblks(fs, i)], (u_int)size); 299 brelse(bp); 300 } 301 loop: 302 for (vp = mountp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 303 nvp = vp->v_mntvnodes.le_next; 304 /* 305 * Step 4: invalidate all inactive vnodes. 306 */ 307 if (vp->v_usecount == 0) { 308 vgone(vp); 309 continue; 310 } 311 /* 312 * Step 5: invalidate all cached file data. 313 */ 314 if (vget(vp, 1)) 315 goto loop; 316 if (vinvalbuf(vp, 0, cred, p, 0, 0)) 317 panic("ffs_reload: dirty2"); 318 /* 319 * Step 6: re-read inode data for all active vnodes. 320 */ 321 ip = VTOI(vp); 322 if (error = 323 bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 324 (int)fs->fs_bsize, NOCRED, &bp)) { 325 vput(vp); 326 return (error); 327 } 328 ip->i_din = *((struct dinode *)bp->b_data + 329 ino_to_fsbo(fs, ip->i_number)); 330 brelse(bp); 331 vput(vp); 332 if (vp->v_mount != mountp) 333 goto loop; 334 } 335 return (0); 336 } 337 338 /* 339 * Common code for mount and mountroot 340 */ 341 int 342 ffs_mountfs(devvp, mp, p) 343 register struct vnode *devvp; 344 struct mount *mp; 345 struct proc *p; 346 { 347 register struct ufsmount *ump; 348 struct buf *bp; 349 register struct fs *fs; 350 dev_t dev = devvp->v_rdev; 351 struct partinfo dpart; 352 caddr_t base, space; 353 int havepart = 0, blks; 354 int error, i, size; 355 int ronly; 356 extern struct vnode *rootvp; 357 358 /* 359 * Disallow multiple mounts of the same device. 360 * Disallow mounting of a device that is currently in use 361 * (except for root, which might share swap device for miniroot). 362 * Flush out any old buffers remaining from a previous use. 363 */ 364 if (error = vfs_mountedon(devvp)) 365 return (error); 366 if (vcount(devvp) > 1 && devvp != rootvp) 367 return (EBUSY); 368 if (error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)) 369 return (error); 370 371 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 372 if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p)) 373 return (error); 374 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0) 375 size = DEV_BSIZE; 376 else { 377 havepart = 1; 378 size = dpart.disklab->d_secsize; 379 } 380 381 bp = NULL; 382 ump = NULL; 383 if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) 384 goto out; 385 fs = (struct fs *)bp->b_data; 386 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 387 fs->fs_bsize < sizeof(struct fs)) { 388 error = EINVAL; /* XXX needs translation */ 389 goto out; 390 } 391 ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK); 392 bzero((caddr_t)ump, sizeof *ump); 393 ump->um_fs = malloc((u_long)fs->fs_sbsize, M_UFSMNT, 394 M_WAITOK); 395 bcopy(bp->b_data, ump->um_fs, (u_int)fs->fs_sbsize); 396 if (fs->fs_sbsize < SBSIZE) 397 bp->b_flags |= B_INVAL; 398 brelse(bp); 399 bp = NULL; 400 fs = ump->um_fs; 401 fs->fs_ronly = ronly; 402 if (ronly == 0) 403 fs->fs_fmod = 1; 404 blks = howmany(fs->fs_cssize, fs->fs_fsize); 405 base = space = malloc((u_long)fs->fs_cssize, M_UFSMNT, 406 M_WAITOK); 407 for (i = 0; i < blks; i += fs->fs_frag) { 408 size = fs->fs_bsize; 409 if (i + fs->fs_frag > blks) 410 size = (blks - i) * fs->fs_fsize; 411 error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size, 412 NOCRED, &bp); 413 if (error) { 414 free(base, M_UFSMNT); 415 goto out; 416 } 417 bcopy(bp->b_data, space, (u_int)size); 418 fs->fs_csp[fragstoblks(fs, i)] = (struct csum *)space; 419 space += size; 420 brelse(bp); 421 bp = NULL; 422 } 423 mp->mnt_data = (qaddr_t)ump; 424 mp->mnt_stat.f_fsid.val[0] = (long)dev; 425 mp->mnt_stat.f_fsid.val[1] = MOUNT_UFS; 426 mp->mnt_maxsymlinklen = fs->fs_maxsymlinklen; 427 mp->mnt_flag |= MNT_LOCAL; 428 ump->um_mountp = mp; 429 ump->um_dev = dev; 430 ump->um_devvp = devvp; 431 ump->um_nindir = fs->fs_nindir; 432 ump->um_bptrtodb = fs->fs_fsbtodb; 433 ump->um_seqinc = fs->fs_frag; 434 for (i = 0; i < MAXQUOTAS; i++) 435 ump->um_quotas[i] = NULLVP; 436 devvp->v_specflags |= SI_MOUNTEDON; 437 ffs_oldfscompat(fs); 438 return (0); 439 out: 440 if (bp) 441 brelse(bp); 442 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 443 if (ump) { 444 free(ump->um_fs, M_UFSMNT); 445 free(ump, M_UFSMNT); 446 mp->mnt_data = (qaddr_t)0; 447 } 448 return (error); 449 } 450 451 /* 452 * Sanity checks for old file systems. 453 * 454 * XXX - goes away some day. 455 */ 456 ffs_oldfscompat(fs) 457 struct fs *fs; 458 { 459 int i; 460 461 fs->fs_npsect = max(fs->fs_npsect, fs->fs_nsect); /* XXX */ 462 fs->fs_interleave = max(fs->fs_interleave, 1); /* XXX */ 463 if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */ 464 fs->fs_nrpos = 8; /* XXX */ 465 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */ 466 quad_t sizepb = fs->fs_bsize; /* XXX */ 467 /* XXX */ 468 fs->fs_maxfilesize = fs->fs_bsize * NDADDR - 1; /* XXX */ 469 for (i = 0; i < NIADDR; i++) { /* XXX */ 470 sizepb *= NINDIR(fs); /* XXX */ 471 fs->fs_maxfilesize += sizepb; /* XXX */ 472 } /* XXX */ 473 fs->fs_qbmask = ~fs->fs_bmask; /* XXX */ 474 fs->fs_qfmask = ~fs->fs_fmask; /* XXX */ 475 } /* XXX */ 476 return (0); 477 } 478 479 /* 480 * unmount system call 481 */ 482 int 483 ffs_unmount(mp, mntflags, p) 484 struct mount *mp; 485 int mntflags; 486 struct proc *p; 487 { 488 register struct ufsmount *ump; 489 register struct fs *fs; 490 int error, flags, ronly; 491 492 flags = 0; 493 if (mntflags & MNT_FORCE) { 494 if (mp->mnt_flag & MNT_ROOTFS) 495 return (EINVAL); 496 flags |= FORCECLOSE; 497 } 498 if (error = ffs_flushfiles(mp, flags, p)) 499 return (error); 500 ump = VFSTOUFS(mp); 501 fs = ump->um_fs; 502 ronly = !fs->fs_ronly; 503 ump->um_devvp->v_specflags &= ~SI_MOUNTEDON; 504 error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE, 505 NOCRED, p); 506 vrele(ump->um_devvp); 507 free(fs->fs_csp[0], M_UFSMNT); 508 free(fs, M_UFSMNT); 509 free(ump, M_UFSMNT); 510 mp->mnt_data = (qaddr_t)0; 511 mp->mnt_flag &= ~MNT_LOCAL; 512 return (error); 513 } 514 515 /* 516 * Flush out all the files in a filesystem. 517 */ 518 ffs_flushfiles(mp, flags, p) 519 register struct mount *mp; 520 int flags; 521 struct proc *p; 522 { 523 extern int doforce; 524 register struct ufsmount *ump; 525 int i, error; 526 527 if (!doforce) 528 flags &= ~FORCECLOSE; 529 ump = VFSTOUFS(mp); 530 #ifdef QUOTA 531 if (mp->mnt_flag & MNT_QUOTA) { 532 if (error = vflush(mp, NULLVP, SKIPSYSTEM|flags)) 533 return (error); 534 for (i = 0; i < MAXQUOTAS; i++) { 535 if (ump->um_quotas[i] == NULLVP) 536 continue; 537 quotaoff(p, mp, i); 538 } 539 /* 540 * Here we fall through to vflush again to ensure 541 * that we have gotten rid of all the system vnodes. 542 */ 543 } 544 #endif 545 error = vflush(mp, NULLVP, flags); 546 return (error); 547 } 548 549 /* 550 * Get file system statistics. 551 */ 552 int 553 ffs_statfs(mp, sbp, p) 554 struct mount *mp; 555 register struct statfs *sbp; 556 struct proc *p; 557 { 558 register struct ufsmount *ump; 559 register struct fs *fs; 560 561 ump = VFSTOUFS(mp); 562 fs = ump->um_fs; 563 if (fs->fs_magic != FS_MAGIC) 564 panic("ffs_statfs"); 565 sbp->f_type = MOUNT_UFS; 566 sbp->f_bsize = fs->fs_fsize; 567 sbp->f_iosize = fs->fs_bsize; 568 sbp->f_blocks = fs->fs_dsize; 569 sbp->f_bfree = fs->fs_cstotal.cs_nbfree * fs->fs_frag + 570 fs->fs_cstotal.cs_nffree; 571 sbp->f_bavail = (fs->fs_dsize * (100 - fs->fs_minfree) / 100) - 572 (fs->fs_dsize - sbp->f_bfree); 573 sbp->f_files = fs->fs_ncg * fs->fs_ipg - ROOTINO; 574 sbp->f_ffree = fs->fs_cstotal.cs_nifree; 575 if (sbp != &mp->mnt_stat) { 576 bcopy((caddr_t)mp->mnt_stat.f_mntonname, 577 (caddr_t)&sbp->f_mntonname[0], MNAMELEN); 578 bcopy((caddr_t)mp->mnt_stat.f_mntfromname, 579 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN); 580 } 581 return (0); 582 } 583 584 /* 585 * Go through the disk queues to initiate sandbagged IO; 586 * go through the inodes to write those that have been modified; 587 * initiate the writing of the super block if it has been modified. 588 * 589 * Note: we are always called with the filesystem marked `MPBUSY'. 590 */ 591 int 592 ffs_sync(mp, waitfor, cred, p) 593 struct mount *mp; 594 int waitfor; 595 struct ucred *cred; 596 struct proc *p; 597 { 598 register struct vnode *vp; 599 register struct inode *ip; 600 register struct ufsmount *ump = VFSTOUFS(mp); 601 register struct fs *fs; 602 int error, allerror = 0; 603 604 fs = ump->um_fs; 605 /* 606 * Write back modified superblock. 607 * Consistency check that the superblock 608 * is still in the buffer cache. 609 */ 610 if (fs->fs_fmod != 0) { 611 if (fs->fs_ronly != 0) { /* XXX */ 612 printf("fs = %s\n", fs->fs_fsmnt); 613 panic("update: rofs mod"); 614 } 615 fs->fs_fmod = 0; 616 fs->fs_time = time.tv_sec; 617 allerror = ffs_sbupdate(ump, waitfor); 618 } 619 /* 620 * Write back each (modified) inode. 621 */ 622 loop: 623 for (vp = mp->mnt_vnodelist.lh_first; 624 vp != NULL; 625 vp = vp->v_mntvnodes.le_next) { 626 /* 627 * If the vnode that we are about to sync is no longer 628 * associated with this mount point, start over. 629 */ 630 if (vp->v_mount != mp) 631 goto loop; 632 if (VOP_ISLOCKED(vp)) 633 continue; 634 ip = VTOI(vp); 635 if ((ip->i_flag & 636 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 637 vp->v_dirtyblkhd.lh_first == NULL) 638 continue; 639 if (vget(vp, 1)) 640 goto loop; 641 if (error = VOP_FSYNC(vp, cred, waitfor, p)) 642 allerror = error; 643 vput(vp); 644 } 645 /* 646 * Force stale file system control information to be flushed. 647 */ 648 if (error = VOP_FSYNC(ump->um_devvp, cred, waitfor, p)) 649 allerror = error; 650 #ifdef QUOTA 651 qsync(mp); 652 #endif 653 return (allerror); 654 } 655 656 /* 657 * Look up a FFS dinode number to find its incore vnode, otherwise read it 658 * in from disk. If it is in core, wait for the lock bit to clear, then 659 * return the inode locked. Detection and handling of mount points must be 660 * done by the calling routine. 661 */ 662 int 663 ffs_vget(mp, ino, vpp) 664 struct mount *mp; 665 ino_t ino; 666 struct vnode **vpp; 667 { 668 register struct fs *fs; 669 register struct inode *ip; 670 struct ufsmount *ump; 671 struct buf *bp; 672 struct vnode *vp; 673 dev_t dev; 674 int i, type, error; 675 676 ump = VFSTOUFS(mp); 677 dev = ump->um_dev; 678 if ((*vpp = ufs_ihashget(dev, ino)) != NULL) 679 return (0); 680 681 /* Allocate a new vnode/inode. */ 682 if (error = getnewvnode(VT_UFS, mp, ffs_vnodeop_p, &vp)) { 683 *vpp = NULL; 684 return (error); 685 } 686 type = ump->um_devvp->v_tag == VT_MFS ? M_MFSNODE : M_FFSNODE; /* XXX */ 687 MALLOC(ip, struct inode *, sizeof(struct inode), type, M_WAITOK); 688 bzero((caddr_t)ip, sizeof(struct inode)); 689 vp->v_data = ip; 690 ip->i_vnode = vp; 691 ip->i_fs = fs = ump->um_fs; 692 ip->i_dev = dev; 693 ip->i_number = ino; 694 #ifdef QUOTA 695 for (i = 0; i < MAXQUOTAS; i++) 696 ip->i_dquot[i] = NODQUOT; 697 #endif 698 /* 699 * Put it onto its hash chain and lock it so that other requests for 700 * this inode will block if they arrive while we are sleeping waiting 701 * for old data structures to be purged or for the contents of the 702 * disk portion of this inode to be read. 703 */ 704 ufs_ihashins(ip); 705 706 /* Read in the disk contents for the inode, copy into the inode. */ 707 if (error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 708 (int)fs->fs_bsize, NOCRED, &bp)) { 709 /* 710 * The inode does not contain anything useful, so it would 711 * be misleading to leave it on its hash chain. With mode 712 * still zero, it will be unlinked and returned to the free 713 * list by vput(). 714 */ 715 vput(vp); 716 brelse(bp); 717 *vpp = NULL; 718 return (error); 719 } 720 ip->i_din = *((struct dinode *)bp->b_data + ino_to_fsbo(fs, ino)); 721 brelse(bp); 722 723 /* 724 * Initialize the vnode from the inode, check for aliases. 725 * Note that the underlying vnode may have changed. 726 */ 727 if (error = ufs_vinit(mp, ffs_specop_p, FFS_FIFOOPS, &vp)) { 728 vput(vp); 729 *vpp = NULL; 730 return (error); 731 } 732 /* 733 * Finish inode initialization now that aliasing has been resolved. 734 */ 735 ip->i_devvp = ump->um_devvp; 736 VREF(ip->i_devvp); 737 /* 738 * Set up a generation number for this inode if it does not 739 * already have one. This should only happen on old filesystems. 740 */ 741 if (ip->i_gen == 0) { 742 if (++nextgennumber < (u_long)time.tv_sec) 743 nextgennumber = time.tv_sec; 744 ip->i_gen = nextgennumber; 745 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 746 ip->i_flag |= IN_MODIFIED; 747 } 748 /* 749 * Ensure that uid and gid are correct. This is a temporary 750 * fix until fsck has been changed to do the update. 751 */ 752 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */ 753 ip->i_uid = ip->i_din.di_ouid; /* XXX */ 754 ip->i_gid = ip->i_din.di_ogid; /* XXX */ 755 } /* XXX */ 756 757 *vpp = vp; 758 return (0); 759 } 760 761 /* 762 * File handle to vnode 763 * 764 * Have to be really careful about stale file handles: 765 * - check that the inode number is valid 766 * - call ffs_vget() to get the locked inode 767 * - check for an unallocated inode (i_mode == 0) 768 * - check that the given client host has export rights and return 769 * those rights via. exflagsp and credanonp 770 */ 771 int 772 ffs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 773 register struct mount *mp; 774 struct fid *fhp; 775 struct mbuf *nam; 776 struct vnode **vpp; 777 int *exflagsp; 778 struct ucred **credanonp; 779 { 780 register struct ufid *ufhp; 781 struct fs *fs; 782 783 ufhp = (struct ufid *)fhp; 784 fs = VFSTOUFS(mp)->um_fs; 785 if (ufhp->ufid_ino < ROOTINO || 786 ufhp->ufid_ino >= fs->fs_ncg * fs->fs_ipg) 787 return (ESTALE); 788 return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp)); 789 } 790 791 /* 792 * Vnode pointer to File handle 793 */ 794 /* ARGSUSED */ 795 ffs_vptofh(vp, fhp) 796 struct vnode *vp; 797 struct fid *fhp; 798 { 799 register struct inode *ip; 800 register struct ufid *ufhp; 801 802 ip = VTOI(vp); 803 ufhp = (struct ufid *)fhp; 804 ufhp->ufid_len = sizeof(struct ufid); 805 ufhp->ufid_ino = ip->i_number; 806 ufhp->ufid_gen = ip->i_gen; 807 return (0); 808 } 809 810 /* 811 * Write a superblock and associated information back to disk. 812 */ 813 int 814 ffs_sbupdate(mp, waitfor) 815 struct ufsmount *mp; 816 int waitfor; 817 { 818 register struct fs *fs = mp->um_fs; 819 register struct buf *bp; 820 int blks; 821 caddr_t space; 822 int i, size, error = 0; 823 824 bp = getblk(mp->um_devvp, SBLOCK, (int)fs->fs_sbsize, 0, 0); 825 bcopy((caddr_t)fs, bp->b_data, (u_int)fs->fs_sbsize); 826 /* Restore compatibility to old file systems. XXX */ 827 if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */ 828 ((struct fs *)bp->b_data)->fs_nrpos = -1; /* XXX */ 829 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */ 830 long *lp, tmp; /* XXX */ 831 /* XXX */ 832 lp = (long *)&((struct fs *)bp->b_data)->fs_qbmask; /* XXX */ 833 tmp = lp[4]; /* XXX */ 834 for (i = 4; i > 0; i--) /* XXX */ 835 lp[i] = lp[i-1]; /* XXX */ 836 lp[0] = tmp; /* XXX */ 837 } /* XXX */ 838 if (waitfor == MNT_WAIT) 839 error = bwrite(bp); 840 else 841 bawrite(bp); 842 blks = howmany(fs->fs_cssize, fs->fs_fsize); 843 space = (caddr_t)fs->fs_csp[0]; 844 for (i = 0; i < blks; i += fs->fs_frag) { 845 size = fs->fs_bsize; 846 if (i + fs->fs_frag > blks) 847 size = (blks - i) * fs->fs_fsize; 848 bp = getblk(mp->um_devvp, fsbtodb(fs, fs->fs_csaddr + i), 849 size, 0, 0); 850 bcopy(space, bp->b_data, (u_int)size); 851 space += size; 852 if (waitfor == MNT_WAIT) 853 error = bwrite(bp); 854 else 855 bawrite(bp); 856 } 857 return (error); 858 } 859