ffs_vfsops.c revision 1.15
1 /* $NetBSD: ffs_vfsops.c,v 1.15 1995/04/12 21:21:00 mycroft 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 8.14 (Berkeley) 11/28/94 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 size_t 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 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 120 mp->mnt_vnodecovered = NULLVP; 121 ump = VFSTOUFS(mp); 122 fs = ump->um_fs; 123 bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt)); 124 fs->fs_fsmnt[0] = '/'; 125 bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN); 126 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 127 &size); 128 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 129 (void)ffs_statfs(mp, &mp->mnt_stat, p); 130 vfs_unlock(mp); 131 inittodr(fs->fs_time); 132 return (0); 133 } 134 135 /* 136 * VFS Operations. 137 * 138 * mount system call 139 */ 140 int 141 ffs_mount(mp, path, data, ndp, p) 142 register struct mount *mp; 143 char *path; 144 caddr_t data; 145 struct nameidata *ndp; 146 struct proc *p; 147 { 148 struct vnode *devvp; 149 struct ufs_args args; 150 struct ufsmount *ump; 151 register struct fs *fs; 152 size_t size; 153 int error, flags; 154 mode_t accessmode; 155 156 if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args))) 157 return (error); 158 /* 159 * If updating, check whether changing from read-only to 160 * read/write; if there is no device name, that's all we do. 161 */ 162 if (mp->mnt_flag & MNT_UPDATE) { 163 ump = VFSTOUFS(mp); 164 fs = ump->um_fs; 165 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 166 flags = WRITECLOSE; 167 if (mp->mnt_flag & MNT_FORCE) 168 flags |= FORCECLOSE; 169 if (vfs_busy(mp)) 170 return (EBUSY); 171 error = ffs_flushfiles(mp, flags, p); 172 if (error == 0 && 173 ffs_cgupdate(ump, MNT_WAIT) == 0 && 174 fs->fs_clean & FS_WASCLEAN) { 175 fs->fs_clean = FS_ISCLEAN; 176 (void) ffs_sbupdate(ump, MNT_WAIT); 177 } 178 vfs_unbusy(mp); 179 if (error) 180 return (error); 181 fs->fs_ronly = 1; 182 } 183 if (mp->mnt_flag & MNT_RELOAD) { 184 error = ffs_reload(mp, ndp->ni_cnd.cn_cred, p); 185 if (error) 186 return (error); 187 } 188 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) { 189 /* 190 * If upgrade to read-write by non-root, then verify 191 * that user has necessary permissions on the device. 192 */ 193 if (p->p_ucred->cr_uid != 0) { 194 devvp = ump->um_devvp; 195 VOP_LOCK(devvp); 196 if (error = VOP_ACCESS(devvp, VREAD | VWRITE, 197 p->p_ucred, p)) { 198 VOP_UNLOCK(devvp); 199 return (error); 200 } 201 VOP_UNLOCK(devvp); 202 } 203 fs->fs_ronly = 0; 204 fs->fs_clean <<= 1; 205 fs->fs_fmod = 1; 206 } 207 if (args.fspec == 0) { 208 /* 209 * Process export requests. 210 */ 211 return (vfs_export(mp, &ump->um_export, &args.export)); 212 } 213 } 214 /* 215 * Not an update, or updating the name: look up the name 216 * and verify that it refers to a sensible block device. 217 */ 218 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 219 if (error = namei(ndp)) 220 return (error); 221 devvp = ndp->ni_vp; 222 223 if (devvp->v_type != VBLK) { 224 vrele(devvp); 225 return (ENOTBLK); 226 } 227 if (major(devvp->v_rdev) >= nblkdev) { 228 vrele(devvp); 229 return (ENXIO); 230 } 231 /* 232 * If mount by non-root, then verify that user has necessary 233 * permissions on the device. 234 */ 235 if (p->p_ucred->cr_uid != 0) { 236 accessmode = VREAD; 237 if ((mp->mnt_flag & MNT_RDONLY) == 0) 238 accessmode |= VWRITE; 239 VOP_LOCK(devvp); 240 if (error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p)) { 241 vput(devvp); 242 return (error); 243 } 244 VOP_UNLOCK(devvp); 245 } 246 if ((mp->mnt_flag & MNT_UPDATE) == 0) 247 error = ffs_mountfs(devvp, mp, p); 248 else { 249 if (devvp != ump->um_devvp) 250 error = EINVAL; /* needs translation */ 251 else 252 vrele(devvp); 253 } 254 if (error) { 255 vrele(devvp); 256 return (error); 257 } 258 ump = VFSTOUFS(mp); 259 fs = ump->um_fs; 260 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 261 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 262 bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN); 263 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 264 &size); 265 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 266 if (fs->fs_fmod != 0) { /* XXX */ 267 fs->fs_fmod = 0; 268 if (fs->fs_clean & FS_WASCLEAN) 269 fs->fs_time = time.tv_sec; 270 else 271 printf("%s: file system not clean; please fsck(8)\n", 272 mp->mnt_stat.f_mntfromname); 273 (void) ffs_cgupdate(ump, MNT_WAIT); 274 } 275 return (0); 276 } 277 278 /* 279 * Reload all incore data for a filesystem (used after running fsck on 280 * the root filesystem and finding things to fix). The filesystem must 281 * be mounted read-only. 282 * 283 * Things to do to update the mount: 284 * 1) invalidate all cached meta-data. 285 * 2) re-read superblock from disk. 286 * 3) re-read summary information from disk. 287 * 4) invalidate all inactive vnodes. 288 * 5) invalidate all cached file data. 289 * 6) re-read inode data for all active vnodes. 290 */ 291 ffs_reload(mountp, cred, p) 292 register struct mount *mountp; 293 struct ucred *cred; 294 struct proc *p; 295 { 296 register struct vnode *vp, *nvp, *devvp; 297 struct inode *ip; 298 struct csum *space; 299 struct buf *bp; 300 struct fs *fs; 301 struct partinfo dpart; 302 int i, blks, size, error; 303 304 if ((mountp->mnt_flag & MNT_RDONLY) == 0) 305 return (EINVAL); 306 /* 307 * Step 1: invalidate all cached meta-data. 308 */ 309 devvp = VFSTOUFS(mountp)->um_devvp; 310 if (vinvalbuf(devvp, 0, cred, p, 0, 0)) 311 panic("ffs_reload: dirty1"); 312 /* 313 * Step 2: re-read superblock from disk. 314 */ 315 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0) 316 size = DEV_BSIZE; 317 else 318 size = dpart.disklab->d_secsize; 319 if (error = bread(devvp, (daddr_t)(SBOFF / size), SBSIZE, NOCRED, &bp)) 320 return (error); 321 fs = (struct fs *)bp->b_data; 322 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 323 fs->fs_bsize < sizeof(struct fs)) { 324 brelse(bp); 325 return (EIO); /* XXX needs translation */ 326 } 327 fs = VFSTOUFS(mountp)->um_fs; 328 bcopy(&fs->fs_csp[0], &((struct fs *)bp->b_data)->fs_csp[0], 329 sizeof(fs->fs_csp)); 330 bcopy(bp->b_data, fs, (u_int)fs->fs_sbsize); 331 if (fs->fs_sbsize < SBSIZE) 332 bp->b_flags |= B_INVAL; 333 brelse(bp); 334 mountp->mnt_maxsymlinklen = fs->fs_maxsymlinklen; 335 ffs_oldfscompat(fs); 336 /* 337 * Step 3: re-read summary information from disk. 338 */ 339 blks = howmany(fs->fs_cssize, fs->fs_fsize); 340 space = fs->fs_csp[0]; 341 for (i = 0; i < blks; i += fs->fs_frag) { 342 size = fs->fs_bsize; 343 if (i + fs->fs_frag > blks) 344 size = (blks - i) * fs->fs_fsize; 345 if (error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size, 346 NOCRED, &bp)) 347 return (error); 348 bcopy(bp->b_data, fs->fs_csp[fragstoblks(fs, i)], (u_int)size); 349 brelse(bp); 350 } 351 loop: 352 for (vp = mountp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 353 nvp = vp->v_mntvnodes.le_next; 354 /* 355 * Step 4: invalidate all inactive vnodes. 356 */ 357 if (vp->v_usecount == 0) { 358 vgone(vp); 359 continue; 360 } 361 /* 362 * Step 5: invalidate all cached file data. 363 */ 364 if (vget(vp, 1)) 365 goto loop; 366 if (vinvalbuf(vp, 0, cred, p, 0, 0)) 367 panic("ffs_reload: dirty2"); 368 /* 369 * Step 6: re-read inode data for all active vnodes. 370 */ 371 ip = VTOI(vp); 372 if (error = 373 bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 374 (int)fs->fs_bsize, NOCRED, &bp)) { 375 vput(vp); 376 return (error); 377 } 378 ip->i_din = *((struct dinode *)bp->b_data + 379 ino_to_fsbo(fs, ip->i_number)); 380 brelse(bp); 381 vput(vp); 382 if (vp->v_mount != mountp) 383 goto loop; 384 } 385 return (0); 386 } 387 388 /* 389 * Common code for mount and mountroot 390 */ 391 int 392 ffs_mountfs(devvp, mp, p) 393 register struct vnode *devvp; 394 struct mount *mp; 395 struct proc *p; 396 { 397 register struct ufsmount *ump; 398 struct buf *bp; 399 register struct fs *fs; 400 dev_t dev; 401 struct partinfo dpart; 402 caddr_t base, space; 403 int blks; 404 int error, i, size, ronly; 405 int32_t *lp; 406 struct ucred *cred; 407 extern struct vnode *rootvp; 408 u_int64_t maxfilesize; /* XXX */ 409 410 dev = devvp->v_rdev; 411 cred = p ? p->p_ucred : NOCRED; 412 /* 413 * Disallow multiple mounts of the same device. 414 * Disallow mounting of a device that is currently in use 415 * (except for root, which might share swap device for miniroot). 416 * Flush out any old buffers remaining from a previous use. 417 */ 418 if (error = vfs_mountedon(devvp)) 419 return (error); 420 if (vcount(devvp) > 1 && devvp != rootvp) 421 return (EBUSY); 422 if (error = vinvalbuf(devvp, V_SAVE, cred, p, 0, 0)) 423 return (error); 424 425 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 426 if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p)) 427 return (error); 428 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, cred, p) != 0) 429 size = DEV_BSIZE; 430 else 431 size = dpart.disklab->d_secsize; 432 433 bp = NULL; 434 ump = NULL; 435 if (error = bread(devvp, (daddr_t)(SBOFF / size), SBSIZE, cred, &bp)) 436 goto out; 437 fs = (struct fs *)bp->b_data; 438 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 439 fs->fs_bsize < sizeof(struct fs)) { 440 error = EINVAL; /* XXX needs translation */ 441 goto out; 442 } 443 /* XXX updating 4.2 FFS superblocks trashes rotational layout tables */ 444 if (fs->fs_postblformat == FS_42POSTBLFMT && !ronly) { 445 error = EROFS; /* XXX what should be returned? */ 446 goto out; 447 } 448 ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK); 449 bzero((caddr_t)ump, sizeof *ump); 450 ump->um_fs = malloc((u_long)fs->fs_sbsize, M_UFSMNT, 451 M_WAITOK); 452 bcopy(bp->b_data, ump->um_fs, (u_int)fs->fs_sbsize); 453 if (fs->fs_sbsize < SBSIZE) 454 bp->b_flags |= B_INVAL; 455 brelse(bp); 456 bp = NULL; 457 fs = ump->um_fs; 458 fs->fs_ronly = ronly; 459 if (ronly == 0) { 460 fs->fs_clean <<= 1; 461 fs->fs_fmod = 1; 462 } 463 size = fs->fs_cssize; 464 blks = howmany(size, fs->fs_fsize); 465 if (fs->fs_contigsumsize > 0) 466 size += fs->fs_ncg * sizeof(int32_t); 467 base = space = malloc((u_long)size, M_UFSMNT, M_WAITOK); 468 for (i = 0; i < blks; i += fs->fs_frag) { 469 size = fs->fs_bsize; 470 if (i + fs->fs_frag > blks) 471 size = (blks - i) * fs->fs_fsize; 472 if (error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size, 473 cred, &bp)) { 474 free(base, M_UFSMNT); 475 goto out; 476 } 477 bcopy(bp->b_data, space, (u_int)size); 478 fs->fs_csp[fragstoblks(fs, i)] = (struct csum *)space; 479 space += size; 480 brelse(bp); 481 bp = NULL; 482 } 483 if (fs->fs_contigsumsize > 0) { 484 fs->fs_maxcluster = lp = (int32_t *)space; 485 for (i = 0; i < fs->fs_ncg; i++) 486 *lp++ = fs->fs_contigsumsize; 487 } 488 mp->mnt_data = (qaddr_t)ump; 489 mp->mnt_stat.f_fsid.val[0] = (long)dev; 490 mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_UFS); 491 mp->mnt_maxsymlinklen = fs->fs_maxsymlinklen; 492 mp->mnt_flag |= MNT_LOCAL; 493 ump->um_mountp = mp; 494 ump->um_dev = dev; 495 ump->um_devvp = devvp; 496 ump->um_nindir = fs->fs_nindir; 497 ump->um_bptrtodb = fs->fs_fsbtodb; 498 ump->um_seqinc = fs->fs_frag; 499 for (i = 0; i < MAXQUOTAS; i++) 500 ump->um_quotas[i] = NULLVP; 501 devvp->v_specflags |= SI_MOUNTEDON; 502 ffs_oldfscompat(fs); 503 ump->um_savedmaxfilesize = fs->fs_maxfilesize; /* XXX */ 504 maxfilesize = (u_int64_t)0x80000000 * fs->fs_bsize - 1; /* XXX */ 505 if (fs->fs_maxfilesize > maxfilesize) /* XXX */ 506 fs->fs_maxfilesize = maxfilesize; /* XXX */ 507 return (0); 508 out: 509 if (bp) 510 brelse(bp); 511 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, cred, p); 512 if (ump) { 513 free(ump->um_fs, M_UFSMNT); 514 free(ump, M_UFSMNT); 515 mp->mnt_data = (qaddr_t)0; 516 } 517 return (error); 518 } 519 520 /* 521 * Sanity checks for old file systems. 522 * 523 * XXX - goes away some day. 524 */ 525 ffs_oldfscompat(fs) 526 struct fs *fs; 527 { 528 int i; 529 530 fs->fs_npsect = max(fs->fs_npsect, fs->fs_nsect); /* XXX */ 531 fs->fs_interleave = max(fs->fs_interleave, 1); /* XXX */ 532 if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */ 533 fs->fs_nrpos = 8; /* XXX */ 534 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */ 535 u_int64_t sizepb = fs->fs_bsize; /* XXX */ 536 /* XXX */ 537 fs->fs_maxfilesize = fs->fs_bsize * NDADDR - 1; /* XXX */ 538 for (i = 0; i < NIADDR; i++) { /* XXX */ 539 sizepb *= NINDIR(fs); /* XXX */ 540 fs->fs_maxfilesize += sizepb; /* XXX */ 541 } /* XXX */ 542 fs->fs_qbmask = ~fs->fs_bmask; /* XXX */ 543 fs->fs_qfmask = ~fs->fs_fmask; /* XXX */ 544 } /* XXX */ 545 return (0); 546 } 547 548 /* 549 * unmount system call 550 */ 551 int 552 ffs_unmount(mp, mntflags, p) 553 struct mount *mp; 554 int mntflags; 555 struct proc *p; 556 { 557 register struct ufsmount *ump; 558 register struct fs *fs; 559 int error, flags; 560 561 flags = 0; 562 if (mntflags & MNT_FORCE) 563 flags |= FORCECLOSE; 564 if (error = ffs_flushfiles(mp, flags, p)) 565 return (error); 566 ump = VFSTOUFS(mp); 567 fs = ump->um_fs; 568 if (fs->fs_ronly == 0 && 569 ffs_cgupdate(ump, MNT_WAIT) == 0 && 570 fs->fs_clean & FS_WASCLEAN) { 571 fs->fs_clean = FS_ISCLEAN; 572 (void) ffs_sbupdate(ump, MNT_WAIT); 573 } 574 ump->um_devvp->v_specflags &= ~SI_MOUNTEDON; 575 error = VOP_CLOSE(ump->um_devvp, fs->fs_ronly ? FREAD : FREAD|FWRITE, 576 NOCRED, p); 577 vrele(ump->um_devvp); 578 free(fs->fs_csp[0], M_UFSMNT); 579 free(fs, M_UFSMNT); 580 free(ump, M_UFSMNT); 581 mp->mnt_data = (qaddr_t)0; 582 mp->mnt_flag &= ~MNT_LOCAL; 583 return (error); 584 } 585 586 /* 587 * Flush out all the files in a filesystem. 588 */ 589 ffs_flushfiles(mp, flags, p) 590 register struct mount *mp; 591 int flags; 592 struct proc *p; 593 { 594 extern int doforce; 595 register struct ufsmount *ump; 596 int i, error; 597 598 if (!doforce) 599 flags &= ~FORCECLOSE; 600 ump = VFSTOUFS(mp); 601 #ifdef QUOTA 602 if (mp->mnt_flag & MNT_QUOTA) { 603 if (error = vflush(mp, NULLVP, SKIPSYSTEM|flags)) 604 return (error); 605 for (i = 0; i < MAXQUOTAS; i++) { 606 if (ump->um_quotas[i] == NULLVP) 607 continue; 608 quotaoff(p, mp, i); 609 } 610 /* 611 * Here we fall through to vflush again to ensure 612 * that we have gotten rid of all the system vnodes. 613 */ 614 } 615 #endif 616 error = vflush(mp, NULLVP, flags); 617 return (error); 618 } 619 620 /* 621 * Get file system statistics. 622 */ 623 int 624 ffs_statfs(mp, sbp, p) 625 struct mount *mp; 626 register struct statfs *sbp; 627 struct proc *p; 628 { 629 register struct ufsmount *ump; 630 register struct fs *fs; 631 632 ump = VFSTOUFS(mp); 633 fs = ump->um_fs; 634 if (fs->fs_magic != FS_MAGIC) 635 panic("ffs_statfs"); 636 #ifdef COMPAT_09 637 sbp->f_type = 1; 638 #else 639 sbp->f_type = 0; 640 #endif 641 sbp->f_bsize = fs->fs_fsize; 642 sbp->f_iosize = fs->fs_bsize; 643 sbp->f_blocks = fs->fs_dsize; 644 sbp->f_bfree = fs->fs_cstotal.cs_nbfree * fs->fs_frag + 645 fs->fs_cstotal.cs_nffree; 646 sbp->f_bavail = (fs->fs_dsize * (100 - fs->fs_minfree) / 100) - 647 (fs->fs_dsize - sbp->f_bfree); 648 sbp->f_files = fs->fs_ncg * fs->fs_ipg - ROOTINO; 649 sbp->f_ffree = fs->fs_cstotal.cs_nifree; 650 if (sbp != &mp->mnt_stat) { 651 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 652 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 653 } 654 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 655 sbp->f_fstypename[MFSNAMELEN] = '\0'; 656 return (0); 657 } 658 659 /* 660 * Go through the disk queues to initiate sandbagged IO; 661 * go through the inodes to write those that have been modified; 662 * initiate the writing of the super block if it has been modified. 663 * 664 * Note: we are always called with the filesystem marked `MPBUSY'. 665 */ 666 int 667 ffs_sync(mp, waitfor, cred, p) 668 struct mount *mp; 669 int waitfor; 670 struct ucred *cred; 671 struct proc *p; 672 { 673 register struct vnode *vp; 674 register struct inode *ip; 675 register struct ufsmount *ump = VFSTOUFS(mp); 676 register struct fs *fs; 677 int error, allerror = 0; 678 679 fs = ump->um_fs; 680 /* 681 * Write back modified superblock. 682 * Consistency check that the superblock 683 * is still in the buffer cache. 684 */ 685 if (fs->fs_fmod != 0) { 686 if (fs->fs_ronly != 0) { /* XXX */ 687 printf("fs = %s\n", fs->fs_fsmnt); 688 panic("update: rofs mod"); 689 } 690 fs->fs_fmod = 0; 691 fs->fs_time = time.tv_sec; 692 allerror = ffs_cgupdate(ump, waitfor); 693 } 694 /* 695 * Write back each (modified) inode. 696 */ 697 loop: 698 for (vp = mp->mnt_vnodelist.lh_first; 699 vp != NULL; 700 vp = vp->v_mntvnodes.le_next) { 701 /* 702 * If the vnode that we are about to sync is no longer 703 * associated with this mount point, start over. 704 */ 705 if (vp->v_mount != mp) 706 goto loop; 707 if (VOP_ISLOCKED(vp)) 708 continue; 709 ip = VTOI(vp); 710 if ((ip->i_flag & 711 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 712 vp->v_dirtyblkhd.lh_first == NULL) 713 continue; 714 if (vget(vp, 1)) 715 goto loop; 716 if (error = VOP_FSYNC(vp, cred, waitfor, p)) 717 allerror = error; 718 vput(vp); 719 } 720 /* 721 * Force stale file system control information to be flushed. 722 */ 723 if (error = VOP_FSYNC(ump->um_devvp, cred, waitfor, p)) 724 allerror = error; 725 #ifdef QUOTA 726 qsync(mp); 727 #endif 728 return (allerror); 729 } 730 731 /* 732 * Look up a FFS dinode number to find its incore vnode, otherwise read it 733 * in from disk. If it is in core, wait for the lock bit to clear, then 734 * return the inode locked. Detection and handling of mount points must be 735 * done by the calling routine. 736 */ 737 int 738 ffs_vget(mp, ino, vpp) 739 struct mount *mp; 740 ino_t ino; 741 struct vnode **vpp; 742 { 743 register struct fs *fs; 744 register struct inode *ip; 745 struct ufsmount *ump; 746 struct buf *bp; 747 struct vnode *vp; 748 dev_t dev; 749 int i, type, error; 750 751 ump = VFSTOUFS(mp); 752 dev = ump->um_dev; 753 if ((*vpp = ufs_ihashget(dev, ino)) != NULL) 754 return (0); 755 756 /* Allocate a new vnode/inode. */ 757 if (error = getnewvnode(VT_UFS, mp, ffs_vnodeop_p, &vp)) { 758 *vpp = NULL; 759 return (error); 760 } 761 type = ump->um_devvp->v_tag == VT_MFS ? M_MFSNODE : M_FFSNODE; /* XXX */ 762 MALLOC(ip, struct inode *, sizeof(struct inode), type, M_WAITOK); 763 bzero((caddr_t)ip, sizeof(struct inode)); 764 vp->v_data = ip; 765 ip->i_vnode = vp; 766 ip->i_fs = fs = ump->um_fs; 767 ip->i_dev = dev; 768 ip->i_number = ino; 769 #ifdef QUOTA 770 for (i = 0; i < MAXQUOTAS; i++) 771 ip->i_dquot[i] = NODQUOT; 772 #endif 773 /* 774 * Put it onto its hash chain and lock it so that other requests for 775 * this inode will block if they arrive while we are sleeping waiting 776 * for old data structures to be purged or for the contents of the 777 * disk portion of this inode to be read. 778 */ 779 ufs_ihashins(ip); 780 781 /* Read in the disk contents for the inode, copy into the inode. */ 782 if (error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 783 (int)fs->fs_bsize, NOCRED, &bp)) { 784 /* 785 * The inode does not contain anything useful, so it would 786 * be misleading to leave it on its hash chain. With mode 787 * still zero, it will be unlinked and returned to the free 788 * list by vput(). 789 */ 790 vput(vp); 791 brelse(bp); 792 *vpp = NULL; 793 return (error); 794 } 795 ip->i_din = *((struct dinode *)bp->b_data + ino_to_fsbo(fs, ino)); 796 brelse(bp); 797 798 /* 799 * Initialize the vnode from the inode, check for aliases. 800 * Note that the underlying vnode may have changed. 801 */ 802 if (error = ufs_vinit(mp, ffs_specop_p, FFS_FIFOOPS, &vp)) { 803 vput(vp); 804 *vpp = NULL; 805 return (error); 806 } 807 /* 808 * Finish inode initialization now that aliasing has been resolved. 809 */ 810 ip->i_devvp = ump->um_devvp; 811 VREF(ip->i_devvp); 812 /* 813 * Set up a generation number for this inode if it does not 814 * already have one. This should only happen on old filesystems. 815 */ 816 if (ip->i_gen == 0) { 817 if (++nextgennumber < (u_long)time.tv_sec) 818 nextgennumber = time.tv_sec; 819 ip->i_gen = nextgennumber; 820 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 821 ip->i_flag |= IN_MODIFIED; 822 } 823 /* 824 * Ensure that uid and gid are correct. This is a temporary 825 * fix until fsck has been changed to do the update. 826 */ 827 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */ 828 ip->i_uid = ip->i_din.di_ouid; /* XXX */ 829 ip->i_gid = ip->i_din.di_ogid; /* XXX */ 830 } /* XXX */ 831 832 *vpp = vp; 833 return (0); 834 } 835 836 /* 837 * File handle to vnode 838 * 839 * Have to be really careful about stale file handles: 840 * - check that the inode number is valid 841 * - call ffs_vget() to get the locked inode 842 * - check for an unallocated inode (i_mode == 0) 843 * - check that the given client host has export rights and return 844 * those rights via. exflagsp and credanonp 845 */ 846 int 847 ffs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 848 register struct mount *mp; 849 struct fid *fhp; 850 struct mbuf *nam; 851 struct vnode **vpp; 852 int *exflagsp; 853 struct ucred **credanonp; 854 { 855 register struct ufid *ufhp; 856 struct fs *fs; 857 858 ufhp = (struct ufid *)fhp; 859 fs = VFSTOUFS(mp)->um_fs; 860 if (ufhp->ufid_ino < ROOTINO || 861 ufhp->ufid_ino >= fs->fs_ncg * fs->fs_ipg) 862 return (ESTALE); 863 return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp)); 864 } 865 866 /* 867 * Vnode pointer to File handle 868 */ 869 /* ARGSUSED */ 870 ffs_vptofh(vp, fhp) 871 struct vnode *vp; 872 struct fid *fhp; 873 { 874 register struct inode *ip; 875 register struct ufid *ufhp; 876 877 ip = VTOI(vp); 878 ufhp = (struct ufid *)fhp; 879 ufhp->ufid_len = sizeof(struct ufid); 880 ufhp->ufid_ino = ip->i_number; 881 ufhp->ufid_gen = ip->i_gen; 882 return (0); 883 } 884 885 /* 886 * Write a superblock and associated information back to disk. 887 */ 888 int 889 ffs_sbupdate(mp, waitfor) 890 struct ufsmount *mp; 891 int waitfor; 892 { 893 register struct fs *dfs, *fs = mp->um_fs; 894 register struct buf *bp; 895 int i, error = 0; 896 897 bp = getblk(mp->um_devvp, SBOFF >> (fs->fs_fshift - fs->fs_fsbtodb), 898 (int)fs->fs_sbsize, 0, 0); 899 bcopy((caddr_t)fs, bp->b_data, (u_int)fs->fs_sbsize); 900 /* Restore compatibility to old file systems. XXX */ 901 dfs = (struct fs *)bp->b_data; /* XXX */ 902 if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */ 903 dfs->fs_nrpos = -1; /* XXX */ 904 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */ 905 int32_t *lp, tmp; /* XXX */ 906 /* XXX */ 907 lp = (int32_t *)&dfs->fs_qbmask; /* XXX */ 908 tmp = lp[4]; /* XXX */ 909 for (i = 4; i > 0; i--) /* XXX */ 910 lp[i] = lp[i-1]; /* XXX */ 911 lp[0] = tmp; /* XXX */ 912 } /* XXX */ 913 dfs->fs_maxfilesize = mp->um_savedmaxfilesize; /* XXX */ 914 if (waitfor == MNT_WAIT) 915 error = bwrite(bp); 916 else 917 bawrite(bp); 918 return (error); 919 } 920 921 int 922 ffs_cgupdate(mp, waitfor) 923 struct ufsmount *mp; 924 int waitfor; 925 { 926 register struct fs *fs = mp->um_fs; 927 register struct buf *bp; 928 int blks; 929 caddr_t space; 930 int i, size, error = 0, allerror = 0; 931 932 allerror = ffs_sbupdate(mp, waitfor); 933 blks = howmany(fs->fs_cssize, fs->fs_fsize); 934 space = (caddr_t)fs->fs_csp[0]; 935 for (i = 0; i < blks; i += fs->fs_frag) { 936 size = fs->fs_bsize; 937 if (i + fs->fs_frag > blks) 938 size = (blks - i) * fs->fs_fsize; 939 bp = getblk(mp->um_devvp, fsbtodb(fs, fs->fs_csaddr + i), 940 size, 0, 0); 941 bcopy(space, bp->b_data, (u_int)size); 942 space += size; 943 if (waitfor == MNT_WAIT) 944 error = bwrite(bp); 945 else 946 bawrite(bp); 947 } 948 if (!allerror && error) 949 allerror = error; 950 return (allerror); 951 } 952
Indexes created Wed Oct 01 19:09:53 GMT 2025