ffs_vfsops.c revision 1.4.2.1
1 /* $NetBSD: ffs_vfsops.c,v 1.4.2.1 1994/11/23 08:49:59 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1991, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)ffs_vfsops.c 8.8 (Berkeley) 4/18/94 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/namei.h> 41 #include <sys/proc.h> 42 #include <sys/kernel.h> 43 #include <sys/vnode.h> 44 #include <sys/socket.h> 45 #include <sys/mount.h> 46 #include <sys/buf.h> 47 #include <sys/mbuf.h> 48 #include <sys/file.h> 49 #include <sys/disklabel.h> 50 #include <sys/ioctl.h> 51 #include <sys/errno.h> 52 #include <sys/malloc.h> 53 54 #include <miscfs/specfs/specdev.h> 55 56 #include <ufs/ufs/quota.h> 57 #include <ufs/ufs/ufsmount.h> 58 #include <ufs/ufs/inode.h> 59 #include <ufs/ufs/ufs_extern.h> 60 61 #include <ufs/ffs/fs.h> 62 #include <ufs/ffs/ffs_extern.h> 63 64 int ffs_sbupdate __P((struct ufsmount *, int)); 65 66 struct vfsops ufs_vfsops = { 67 MOUNT_UFS, 68 ffs_mount, 69 ufs_start, 70 ffs_unmount, 71 ufs_root, 72 ufs_quotactl, 73 ffs_statfs, 74 ffs_sync, 75 ffs_vget, 76 ffs_fhtovp, 77 ffs_vptofh, 78 ffs_init, 79 }; 80 81 extern u_long nextgennumber; 82 83 /* 84 * Called by main() when ufs is going to be mounted as root. 85 * 86 * Name is updated by mount(8) after booting. 87 */ 88 #define ROOTNAME "root_device" 89 90 ffs_mountroot() 91 { 92 extern struct vnode *rootvp; 93 register struct fs *fs; 94 register struct mount *mp; 95 struct proc *p = curproc; /* XXX */ 96 struct ufsmount *ump; 97 u_int size; 98 int error; 99 100 /* 101 * Get vnodes for swapdev and rootdev. 102 */ 103 if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp)) 104 panic("ffs_mountroot: can't setup bdevvp's"); 105 106 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 107 bzero((char *)mp, (u_long)sizeof(struct mount)); 108 mp->mnt_op = &ufs_vfsops; 109 mp->mnt_flag = MNT_RDONLY; 110 if (error = ffs_mountfs(rootvp, mp, p)) { 111 free(mp, M_MOUNT); 112 return (error); 113 } 114 if (error = vfs_lock(mp)) { 115 (void)ffs_unmount(mp, 0, p); 116 free(mp, M_MOUNT); 117 return (error); 118 } 119 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 120 mp->mnt_flag |= MNT_ROOTFS; 121 mp->mnt_vnodecovered = NULLVP; 122 ump = VFSTOUFS(mp); 123 fs = ump->um_fs; 124 bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt)); 125 fs->fs_fsmnt[0] = '/'; 126 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 127 MNAMELEN); 128 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 129 &size); 130 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 131 (void)ffs_statfs(mp, &mp->mnt_stat, p); 132 vfs_unlock(mp); 133 inittodr(fs->fs_time); 134 return (0); 135 } 136 137 /* 138 * VFS Operations. 139 * 140 * mount system call 141 */ 142 int 143 ffs_mount(mp, path, data, ndp, p) 144 register struct mount *mp; 145 char *path; 146 caddr_t data; 147 struct nameidata *ndp; 148 struct proc *p; 149 { 150 struct vnode *devvp; 151 struct ufs_args args; 152 struct ufsmount *ump; 153 register struct fs *fs; 154 u_int size; 155 int error, flags; 156 157 if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args))) 158 return (error); 159 /* 160 * If updating, check whether changing from read-only to 161 * read/write; if there is no device name, that's all we do. 162 */ 163 if (mp->mnt_flag & MNT_UPDATE) { 164 ump = VFSTOUFS(mp); 165 fs = ump->um_fs; 166 error = 0; 167 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 168 flags = WRITECLOSE; 169 if (mp->mnt_flag & MNT_FORCE) 170 flags |= FORCECLOSE; 171 if (vfs_busy(mp)) 172 return (EBUSY); 173 error = ffs_flushfiles(mp, flags, p); 174 vfs_unbusy(mp); 175 } 176 if (!error && (mp->mnt_flag & MNT_RELOAD)) 177 error = ffs_reload(mp, ndp->ni_cnd.cn_cred, p); 178 if (error) 179 return (error); 180 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 181 fs->fs_ronly = 0; 182 if (args.fspec == 0) { 183 /* 184 * Process export requests. 185 */ 186 return (vfs_export(mp, &ump->um_export, &args.export)); 187 } 188 } 189 /* 190 * Not an update, or updating the name: look up the name 191 * and verify that it refers to a sensible block device. 192 */ 193 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 194 if (error = namei(ndp)) 195 return (error); 196 devvp = ndp->ni_vp; 197 198 if (devvp->v_type != VBLK) { 199 vrele(devvp); 200 return (ENOTBLK); 201 } 202 if (major(devvp->v_rdev) >= nblkdev) { 203 vrele(devvp); 204 return (ENXIO); 205 } 206 if ((mp->mnt_flag & MNT_UPDATE) == 0) 207 error = ffs_mountfs(devvp, mp, p); 208 else { 209 if (devvp != ump->um_devvp) 210 error = EINVAL; /* needs translation */ 211 else 212 vrele(devvp); 213 } 214 if (error) { 215 vrele(devvp); 216 return (error); 217 } 218 ump = VFSTOUFS(mp); 219 fs = ump->um_fs; 220 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 221 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 222 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 223 MNAMELEN); 224 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 225 &size); 226 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 227 (void)ffs_statfs(mp, &mp->mnt_stat, p); 228 return (0); 229 } 230 231 /* 232 * Reload all incore data for a filesystem (used after running fsck on 233 * the root filesystem and finding things to fix). The filesystem must 234 * be mounted read-only. 235 * 236 * Things to do to update the mount: 237 * 1) invalidate all cached meta-data. 238 * 2) re-read superblock from disk. 239 * 3) re-read summary information from disk. 240 * 4) invalidate all inactive vnodes. 241 * 5) invalidate all cached file data. 242 * 6) re-read inode data for all active vnodes. 243 */ 244 ffs_reload(mountp, cred, p) 245 register struct mount *mountp; 246 struct ucred *cred; 247 struct proc *p; 248 { 249 register struct vnode *vp, *nvp, *devvp; 250 struct inode *ip; 251 struct csum *space; 252 struct buf *bp; 253 struct fs *fs; 254 struct partinfo dpart; 255 int i, blks, size, error; 256 257 if ((mountp->mnt_flag & MNT_RDONLY) == 0) 258 return (EINVAL); 259 /* 260 * Step 1: invalidate all cached meta-data. 261 */ 262 devvp = VFSTOUFS(mountp)->um_devvp; 263 if (vinvalbuf(devvp, 0, cred, p, 0, 0)) 264 panic("ffs_reload: dirty1"); 265 /* 266 * Step 2: re-read superblock from disk. 267 */ 268 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0) 269 size = DEV_BSIZE; 270 else 271 size = dpart.disklab->d_secsize; 272 if (error = bread(devvp, (daddr_t)(SBOFF / size), SBSIZE, NOCRED, &bp)) 273 return (error); 274 fs = (struct fs *)bp->b_data; 275 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 276 fs->fs_bsize < sizeof(struct fs)) { 277 brelse(bp); 278 return (EIO); /* XXX needs translation */ 279 } 280 fs = VFSTOUFS(mountp)->um_fs; 281 bcopy(&fs->fs_csp[0], &((struct fs *)bp->b_data)->fs_csp[0], 282 sizeof(fs->fs_csp)); 283 bcopy(bp->b_data, fs, (u_int)fs->fs_sbsize); 284 if (fs->fs_sbsize < SBSIZE) 285 bp->b_flags |= B_INVAL; 286 brelse(bp); 287 mountp->mnt_maxsymlinklen = fs->fs_maxsymlinklen; 288 ffs_oldfscompat(fs); 289 /* 290 * Step 3: re-read summary information from disk. 291 */ 292 blks = howmany(fs->fs_cssize, fs->fs_fsize); 293 space = fs->fs_csp[0]; 294 for (i = 0; i < blks; i += fs->fs_frag) { 295 size = fs->fs_bsize; 296 if (i + fs->fs_frag > blks) 297 size = (blks - i) * fs->fs_fsize; 298 if (error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size, 299 NOCRED, &bp)) 300 return (error); 301 bcopy(bp->b_data, fs->fs_csp[fragstoblks(fs, i)], (u_int)size); 302 brelse(bp); 303 } 304 loop: 305 for (vp = mountp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 306 nvp = vp->v_mntvnodes.le_next; 307 /* 308 * Step 4: invalidate all inactive vnodes. 309 */ 310 if (vp->v_usecount == 0) { 311 vgone(vp); 312 continue; 313 } 314 /* 315 * Step 5: invalidate all cached file data. 316 */ 317 if (vget(vp, 1)) 318 goto loop; 319 if (vinvalbuf(vp, 0, cred, p, 0, 0)) 320 panic("ffs_reload: dirty2"); 321 /* 322 * Step 6: re-read inode data for all active vnodes. 323 */ 324 ip = VTOI(vp); 325 if (error = 326 bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 327 (int)fs->fs_bsize, NOCRED, &bp)) { 328 vput(vp); 329 return (error); 330 } 331 ip->i_din = *((struct dinode *)bp->b_data + 332 ino_to_fsbo(fs, ip->i_number)); 333 brelse(bp); 334 vput(vp); 335 if (vp->v_mount != mountp) 336 goto loop; 337 } 338 return (0); 339 } 340 341 /* 342 * Common code for mount and mountroot 343 */ 344 int 345 ffs_mountfs(devvp, mp, p) 346 register struct vnode *devvp; 347 struct mount *mp; 348 struct proc *p; 349 { 350 register struct ufsmount *ump; 351 struct buf *bp; 352 register struct fs *fs; 353 dev_t dev = devvp->v_rdev; 354 struct partinfo dpart; 355 caddr_t base, space; 356 int blks; 357 int error, i, size; 358 int ronly; 359 extern struct vnode *rootvp; 360 361 /* 362 * Disallow multiple mounts of the same device. 363 * Disallow mounting of a device that is currently in use 364 * (except for root, which might share swap device for miniroot). 365 * Flush out any old buffers remaining from a previous use. 366 */ 367 if (error = vfs_mountedon(devvp)) 368 return (error); 369 if (vcount(devvp) > 1 && devvp != rootvp) 370 return (EBUSY); 371 if (error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)) 372 return (error); 373 374 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 375 if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p)) 376 return (error); 377 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0) 378 size = DEV_BSIZE; 379 else 380 size = dpart.disklab->d_secsize; 381 382 bp = NULL; 383 ump = NULL; 384 if (error = bread(devvp, (daddr_t)(SBOFF / size), SBSIZE, NOCRED, &bp)) 385 goto out; 386 fs = (struct fs *)bp->b_data; 387 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 388 fs->fs_bsize < sizeof(struct fs)) { 389 error = EINVAL; /* XXX needs translation */ 390 goto out; 391 } 392 /* XXX updating 4.2 FFS superblocks trashes rotational layout tables */ 393 if (fs->fs_postblformat == FS_42POSTBLFMT && !ronly) { 394 error = EROFS; /* XXX what should be returned? */ 395 goto out; 396 } 397 ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK); 398 bzero((caddr_t)ump, sizeof *ump); 399 ump->um_fs = malloc((u_long)fs->fs_sbsize, M_UFSMNT, 400 M_WAITOK); 401 bcopy(bp->b_data, ump->um_fs, (u_int)fs->fs_sbsize); 402 if (fs->fs_sbsize < SBSIZE) 403 bp->b_flags |= B_INVAL; 404 brelse(bp); 405 bp = NULL; 406 fs = ump->um_fs; 407 fs->fs_ronly = ronly; 408 if (ronly == 0) 409 fs->fs_fmod = 1; 410 blks = howmany(fs->fs_cssize, fs->fs_fsize); 411 base = space = malloc((u_long)fs->fs_cssize, M_UFSMNT, 412 M_WAITOK); 413 for (i = 0; i < blks; i += fs->fs_frag) { 414 size = fs->fs_bsize; 415 if (i + fs->fs_frag > blks) 416 size = (blks - i) * fs->fs_fsize; 417 error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size, 418 NOCRED, &bp); 419 if (error) { 420 free(base, M_UFSMNT); 421 goto out; 422 } 423 bcopy(bp->b_data, space, (u_int)size); 424 fs->fs_csp[fragstoblks(fs, i)] = (struct csum *)space; 425 space += size; 426 brelse(bp); 427 bp = NULL; 428 } 429 mp->mnt_data = (qaddr_t)ump; 430 mp->mnt_stat.f_fsid.val[0] = (long)dev; 431 mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_UFS); 432 mp->mnt_maxsymlinklen = fs->fs_maxsymlinklen; 433 mp->mnt_flag |= MNT_LOCAL; 434 ump->um_mountp = mp; 435 ump->um_dev = dev; 436 ump->um_devvp = devvp; 437 ump->um_nindir = fs->fs_nindir; 438 ump->um_bptrtodb = fs->fs_fsbtodb; 439 ump->um_seqinc = fs->fs_frag; 440 for (i = 0; i < MAXQUOTAS; i++) 441 ump->um_quotas[i] = NULLVP; 442 devvp->v_specflags |= SI_MOUNTEDON; 443 ffs_oldfscompat(fs); 444 return (0); 445 out: 446 if (bp) 447 brelse(bp); 448 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 449 if (ump) { 450 free(ump->um_fs, M_UFSMNT); 451 free(ump, M_UFSMNT); 452 mp->mnt_data = (qaddr_t)0; 453 } 454 return (error); 455 } 456 457 /* 458 * Sanity checks for old file systems. 459 * 460 * XXX - goes away some day. 461 */ 462 ffs_oldfscompat(fs) 463 struct fs *fs; 464 { 465 int i; 466 467 fs->fs_npsect = max(fs->fs_npsect, fs->fs_nsect); /* XXX */ 468 fs->fs_interleave = max(fs->fs_interleave, 1); /* XXX */ 469 if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */ 470 fs->fs_nrpos = 8; /* XXX */ 471 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */ 472 quad_t sizepb = fs->fs_bsize; /* XXX */ 473 /* XXX */ 474 fs->fs_maxfilesize = fs->fs_bsize * NDADDR - 1; /* XXX */ 475 for (i = 0; i < NIADDR; i++) { /* XXX */ 476 sizepb *= NINDIR(fs); /* XXX */ 477 fs->fs_maxfilesize += sizepb; /* XXX */ 478 } /* XXX */ 479 fs->fs_qbmask = ~fs->fs_bmask; /* XXX */ 480 fs->fs_qfmask = ~fs->fs_fmask; /* XXX */ 481 } /* XXX */ 482 #ifndef KLUGE_BEGONE 483 { 484 quad_t maxfilesize; 485 486 maxfilesize = (quad_t)0x80000000 * fs->fs_bsize - 1; 487 if (fs->fs_maxfilesize > maxfilesize) 488 fs->fs_maxfilesize = maxfilesize; 489 } 490 #endif 491 return (0); 492 } 493 494 /* 495 * unmount system call 496 */ 497 int 498 ffs_unmount(mp, mntflags, p) 499 struct mount *mp; 500 int mntflags; 501 struct proc *p; 502 { 503 register struct ufsmount *ump; 504 register struct fs *fs; 505 int error, flags, ronly; 506 507 flags = 0; 508 if (mntflags & MNT_FORCE) { 509 if (mp->mnt_flag & MNT_ROOTFS) 510 return (EINVAL); 511 flags |= FORCECLOSE; 512 } 513 if (error = ffs_flushfiles(mp, flags, p)) 514 return (error); 515 ump = VFSTOUFS(mp); 516 fs = ump->um_fs; 517 ronly = !fs->fs_ronly; 518 ump->um_devvp->v_specflags &= ~SI_MOUNTEDON; 519 error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE, 520 NOCRED, p); 521 vrele(ump->um_devvp); 522 free(fs->fs_csp[0], M_UFSMNT); 523 free(fs, M_UFSMNT); 524 free(ump, M_UFSMNT); 525 mp->mnt_data = (qaddr_t)0; 526 mp->mnt_flag &= ~MNT_LOCAL; 527 return (error); 528 } 529 530 /* 531 * Flush out all the files in a filesystem. 532 */ 533 ffs_flushfiles(mp, flags, p) 534 register struct mount *mp; 535 int flags; 536 struct proc *p; 537 { 538 extern int doforce; 539 register struct ufsmount *ump; 540 int i, error; 541 542 if (!doforce) 543 flags &= ~FORCECLOSE; 544 ump = VFSTOUFS(mp); 545 #ifdef QUOTA 546 if (mp->mnt_flag & MNT_QUOTA) { 547 if (error = vflush(mp, NULLVP, SKIPSYSTEM|flags)) 548 return (error); 549 for (i = 0; i < MAXQUOTAS; i++) { 550 if (ump->um_quotas[i] == NULLVP) 551 continue; 552 quotaoff(p, mp, i); 553 } 554 /* 555 * Here we fall through to vflush again to ensure 556 * that we have gotten rid of all the system vnodes. 557 */ 558 } 559 #endif 560 error = vflush(mp, NULLVP, flags); 561 return (error); 562 } 563 564 /* 565 * Get file system statistics. 566 */ 567 int 568 ffs_statfs(mp, sbp, p) 569 struct mount *mp; 570 register struct statfs *sbp; 571 struct proc *p; 572 { 573 register struct ufsmount *ump; 574 register struct fs *fs; 575 576 ump = VFSTOUFS(mp); 577 fs = ump->um_fs; 578 if (fs->fs_magic != FS_MAGIC) 579 panic("ffs_statfs"); 580 #ifdef COMPAT_09 581 sbp->f_type = 1; 582 #else 583 sbp->f_type = 0; 584 #endif 585 sbp->f_bsize = fs->fs_fsize; 586 sbp->f_iosize = fs->fs_bsize; 587 sbp->f_blocks = fs->fs_dsize; 588 sbp->f_bfree = fs->fs_cstotal.cs_nbfree * fs->fs_frag + 589 fs->fs_cstotal.cs_nffree; 590 sbp->f_bavail = (fs->fs_dsize * (100 - fs->fs_minfree) / 100) - 591 (fs->fs_dsize - sbp->f_bfree); 592 sbp->f_files = fs->fs_ncg * fs->fs_ipg - ROOTINO; 593 sbp->f_ffree = fs->fs_cstotal.cs_nifree; 594 if (sbp != &mp->mnt_stat) { 595 bcopy((caddr_t)mp->mnt_stat.f_mntonname, 596 (caddr_t)&sbp->f_mntonname[0], MNAMELEN); 597 bcopy((caddr_t)mp->mnt_stat.f_mntfromname, 598 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN); 599 } 600 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 601 sbp->f_fstypename[MFSNAMELEN] = '\0'; 602 return (0); 603 } 604 605 /* 606 * Go through the disk queues to initiate sandbagged IO; 607 * go through the inodes to write those that have been modified; 608 * initiate the writing of the super block if it has been modified. 609 * 610 * Note: we are always called with the filesystem marked `MPBUSY'. 611 */ 612 int 613 ffs_sync(mp, waitfor, cred, p) 614 struct mount *mp; 615 int waitfor; 616 struct ucred *cred; 617 struct proc *p; 618 { 619 register struct vnode *vp; 620 register struct inode *ip; 621 register struct ufsmount *ump = VFSTOUFS(mp); 622 register struct fs *fs; 623 int error, allerror = 0; 624 625 fs = ump->um_fs; 626 /* 627 * Write back modified superblock. 628 * Consistency check that the superblock 629 * is still in the buffer cache. 630 */ 631 if (fs->fs_fmod != 0) { 632 if (fs->fs_ronly != 0) { /* XXX */ 633 printf("fs = %s\n", fs->fs_fsmnt); 634 panic("update: rofs mod"); 635 } 636 fs->fs_fmod = 0; 637 fs->fs_time = time.tv_sec; 638 allerror = ffs_sbupdate(ump, waitfor); 639 } 640 /* 641 * Write back each (modified) inode. 642 */ 643 loop: 644 for (vp = mp->mnt_vnodelist.lh_first; 645 vp != NULL; 646 vp = vp->v_mntvnodes.le_next) { 647 /* 648 * If the vnode that we are about to sync is no longer 649 * associated with this mount point, start over. 650 */ 651 if (vp->v_mount != mp) 652 goto loop; 653 if (VOP_ISLOCKED(vp)) 654 continue; 655 ip = VTOI(vp); 656 if ((ip->i_flag & 657 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 658 vp->v_dirtyblkhd.lh_first == NULL) 659 continue; 660 if (vget(vp, 1)) 661 goto loop; 662 if (error = VOP_FSYNC(vp, cred, waitfor, p)) 663 allerror = error; 664 vput(vp); 665 } 666 /* 667 * Force stale file system control information to be flushed. 668 */ 669 if (error = VOP_FSYNC(ump->um_devvp, cred, waitfor, p)) 670 allerror = error; 671 #ifdef QUOTA 672 qsync(mp); 673 #endif 674 return (allerror); 675 } 676 677 /* 678 * Look up a FFS dinode number to find its incore vnode, otherwise read it 679 * in from disk. If it is in core, wait for the lock bit to clear, then 680 * return the inode locked. Detection and handling of mount points must be 681 * done by the calling routine. 682 */ 683 int 684 ffs_vget(mp, ino, vpp) 685 struct mount *mp; 686 ino_t ino; 687 struct vnode **vpp; 688 { 689 register struct fs *fs; 690 register struct inode *ip; 691 struct ufsmount *ump; 692 struct buf *bp; 693 struct vnode *vp; 694 dev_t dev; 695 int i, type, error; 696 697 ump = VFSTOUFS(mp); 698 dev = ump->um_dev; 699 if ((*vpp = ufs_ihashget(dev, ino)) != NULL) 700 return (0); 701 702 /* Allocate a new vnode/inode. */ 703 if (error = getnewvnode(VT_UFS, mp, ffs_vnodeop_p, &vp)) { 704 *vpp = NULL; 705 return (error); 706 } 707 type = ump->um_devvp->v_tag == VT_MFS ? M_MFSNODE : M_FFSNODE; /* XXX */ 708 MALLOC(ip, struct inode *, sizeof(struct inode), type, M_WAITOK); 709 bzero((caddr_t)ip, sizeof(struct inode)); 710 vp->v_data = ip; 711 ip->i_vnode = vp; 712 ip->i_fs = fs = ump->um_fs; 713 ip->i_dev = dev; 714 ip->i_number = ino; 715 #ifdef QUOTA 716 for (i = 0; i < MAXQUOTAS; i++) 717 ip->i_dquot[i] = NODQUOT; 718 #endif 719 /* 720 * Put it onto its hash chain and lock it so that other requests for 721 * this inode will block if they arrive while we are sleeping waiting 722 * for old data structures to be purged or for the contents of the 723 * disk portion of this inode to be read. 724 */ 725 ufs_ihashins(ip); 726 727 /* Read in the disk contents for the inode, copy into the inode. */ 728 if (error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 729 (int)fs->fs_bsize, NOCRED, &bp)) { 730 /* 731 * The inode does not contain anything useful, so it would 732 * be misleading to leave it on its hash chain. With mode 733 * still zero, it will be unlinked and returned to the free 734 * list by vput(). 735 */ 736 vput(vp); 737 brelse(bp); 738 *vpp = NULL; 739 return (error); 740 } 741 ip->i_din = *((struct dinode *)bp->b_data + ino_to_fsbo(fs, ino)); 742 brelse(bp); 743 744 /* 745 * Initialize the vnode from the inode, check for aliases. 746 * Note that the underlying vnode may have changed. 747 */ 748 if (error = ufs_vinit(mp, ffs_specop_p, FFS_FIFOOPS, &vp)) { 749 vput(vp); 750 *vpp = NULL; 751 return (error); 752 } 753 /* 754 * Finish inode initialization now that aliasing has been resolved. 755 */ 756 ip->i_devvp = ump->um_devvp; 757 VREF(ip->i_devvp); 758 /* 759 * Set up a generation number for this inode if it does not 760 * already have one. This should only happen on old filesystems. 761 */ 762 if (ip->i_gen == 0) { 763 if (++nextgennumber < (u_long)time.tv_sec) 764 nextgennumber = time.tv_sec; 765 ip->i_gen = nextgennumber; 766 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 767 ip->i_flag |= IN_MODIFIED; 768 } 769 /* 770 * Ensure that uid and gid are correct. This is a temporary 771 * fix until fsck has been changed to do the update. 772 */ 773 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */ 774 ip->i_uid = ip->i_din.di_ouid; /* XXX */ 775 ip->i_gid = ip->i_din.di_ogid; /* XXX */ 776 } /* XXX */ 777 778 *vpp = vp; 779 return (0); 780 } 781 782 /* 783 * File handle to vnode 784 * 785 * Have to be really careful about stale file handles: 786 * - check that the inode number is valid 787 * - call ffs_vget() to get the locked inode 788 * - check for an unallocated inode (i_mode == 0) 789 * - check that the given client host has export rights and return 790 * those rights via. exflagsp and credanonp 791 */ 792 int 793 ffs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 794 register struct mount *mp; 795 struct fid *fhp; 796 struct mbuf *nam; 797 struct vnode **vpp; 798 int *exflagsp; 799 struct ucred **credanonp; 800 { 801 register struct ufid *ufhp; 802 struct fs *fs; 803 804 ufhp = (struct ufid *)fhp; 805 fs = VFSTOUFS(mp)->um_fs; 806 if (ufhp->ufid_ino < ROOTINO || 807 ufhp->ufid_ino >= fs->fs_ncg * fs->fs_ipg) 808 return (ESTALE); 809 return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp)); 810 } 811 812 /* 813 * Vnode pointer to File handle 814 */ 815 /* ARGSUSED */ 816 ffs_vptofh(vp, fhp) 817 struct vnode *vp; 818 struct fid *fhp; 819 { 820 register struct inode *ip; 821 register struct ufid *ufhp; 822 823 ip = VTOI(vp); 824 ufhp = (struct ufid *)fhp; 825 ufhp->ufid_len = sizeof(struct ufid); 826 ufhp->ufid_ino = ip->i_number; 827 ufhp->ufid_gen = ip->i_gen; 828 return (0); 829 } 830 831 /* 832 * Write a superblock and associated information back to disk. 833 */ 834 int 835 ffs_sbupdate(mp, waitfor) 836 struct ufsmount *mp; 837 int waitfor; 838 { 839 register struct fs *fs = mp->um_fs; 840 register struct buf *bp; 841 int blks; 842 caddr_t space; 843 int i, size, error = 0; 844 struct fs *cfs; 845 846 bp = getblk(mp->um_devvp, SBOFF >> (fs->fs_fshift - fs->fs_fsbtodb), 847 (int)fs->fs_sbsize, 0, 0); 848 bcopy((caddr_t)fs, bp->b_data, (u_int)fs->fs_sbsize); 849 cfs = (struct fs *)bp->b_data; 850 /* Restore compatibility to old file systems. XXX */ 851 if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */ 852 cfs->fs_nrpos = -1; /* XXX */ 853 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */ 854 long *lp, tmp; /* XXX */ 855 /* XXX */ 856 lp = (long *)&((struct fs *)bp->b_data)->fs_qbmask; /* XXX */ 857 tmp = lp[4]; /* XXX */ 858 for (i = 4; i > 0; i--) /* XXX */ 859 lp[i] = lp[i-1]; /* XXX */ 860 lp[0] = tmp; /* XXX */ 861 } /* XXX */ 862 #ifndef KLUGE_BEGONE 863 { 864 quad_t sizepb = fs->fs_bsize; /* XXX */ 865 /* XXX */ 866 cfs->fs_maxfilesize = fs->fs_bsize * NDADDR - 1; /* XXX */ 867 for (i = 0; i < NIADDR; i++) { /* XXX */ 868 sizepb *= NINDIR(fs); /* XXX */ 869 cfs->fs_maxfilesize += sizepb; /* XXX */ 870 } /* XXX */ 871 } 872 #endif 873 if (waitfor == MNT_WAIT) 874 error = bwrite(bp); 875 else 876 bawrite(bp); 877 blks = howmany(fs->fs_cssize, fs->fs_fsize); 878 space = (caddr_t)fs->fs_csp[0]; 879 for (i = 0; i < blks; i += fs->fs_frag) { 880 size = fs->fs_bsize; 881 if (i + fs->fs_frag > blks) 882 size = (blks - i) * fs->fs_fsize; 883 bp = getblk(mp->um_devvp, fsbtodb(fs, fs->fs_csaddr + i), 884 size, 0, 0); 885 bcopy(space, bp->b_data, (u_int)size); 886 space += size; 887 if (waitfor == MNT_WAIT) 888 error = bwrite(bp); 889 else 890 bawrite(bp); 891 } 892 return (error); 893 } 894
Indexes created Sat Oct 18 23:09:54 GMT 2025