ffs_vfsops.c revision 1.29
1 /* ffs_vfsops.c,v 1.28 1997/07/07 11:47:06 fvdl 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/device.h> 48 #include <sys/mbuf.h> 49 #include <sys/file.h> 50 #include <sys/disklabel.h> 51 #include <sys/ioctl.h> 52 #include <sys/errno.h> 53 #include <sys/malloc.h> 54 #include <sys/lock.h> 55 56 #include <miscfs/specfs/specdev.h> 57 58 #include <ufs/ufs/quota.h> 59 #include <ufs/ufs/ufsmount.h> 60 #include <ufs/ufs/inode.h> 61 #include <ufs/ufs/dir.h> 62 #include <ufs/ufs/ufs_extern.h> 63 64 #include <ufs/ffs/fs.h> 65 #include <ufs/ffs/ffs_extern.h> 66 67 extern struct lock ufs_hashlock; 68 69 int ffs_sbupdate __P((struct ufsmount *, int)); 70 71 struct vfsops ffs_vfsops = { 72 MOUNT_FFS, 73 ffs_mount, 74 ufs_start, 75 ffs_unmount, 76 ufs_root, 77 ufs_quotactl, 78 ffs_statfs, 79 ffs_sync, 80 ffs_vget, 81 ffs_fhtovp, 82 ffs_vptofh, 83 ffs_init, 84 ffs_mountroot, 85 }; 86 87 /* 88 * Called by main() when ufs is going to be mounted as root. 89 * 90 * Name is updated by mount(8) after booting. 91 */ 92 #define ROOTNAME "root_device" 93 94 int 95 ffs_mountroot() 96 { 97 extern struct vnode *rootvp; 98 register struct fs *fs; 99 register struct mount *mp; 100 struct proc *p = curproc; /* XXX */ 101 struct ufsmount *ump; 102 size_t size; 103 int error; 104 105 if (root_device->dv_class != DV_DISK) 106 return (ENODEV); 107 108 /* 109 * Get vnodes for rootdev. 110 */ 111 if (bdevvp(rootdev, &rootvp)) 112 panic("ffs_mountroot: can't setup bdevvp's"); 113 114 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 115 bzero((char *)mp, (u_long)sizeof(struct mount)); 116 mp->mnt_op = &ffs_vfsops; 117 mp->mnt_flag = MNT_RDONLY; 118 if ((error = ffs_mountfs(rootvp, mp, p)) != 0) { 119 free(mp, M_MOUNT); 120 return (error); 121 } 122 if ((error = vfs_lock(mp)) != 0) { 123 (void)ffs_unmount(mp, 0, p); 124 free(mp, M_MOUNT); 125 return (error); 126 } 127 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 128 mp->mnt_vnodecovered = NULLVP; 129 ump = VFSTOUFS(mp); 130 fs = ump->um_fs; 131 bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt)); 132 fs->fs_fsmnt[0] = '/'; 133 bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN); 134 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 135 &size); 136 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 137 (void)ffs_statfs(mp, &mp->mnt_stat, p); 138 vfs_unlock(mp); 139 inittodr(fs->fs_time); 140 return (0); 141 } 142 143 /* 144 * VFS Operations. 145 * 146 * mount system call 147 */ 148 int 149 ffs_mount(mp, path, data, ndp, p) 150 register struct mount *mp; 151 const char *path; 152 void *data; 153 struct nameidata *ndp; 154 struct proc *p; 155 { 156 struct vnode *devvp; 157 struct ufs_args args; 158 struct ufsmount *ump = NULL; 159 register struct fs *fs; 160 size_t size; 161 int error, flags; 162 mode_t accessmode; 163 164 error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)); 165 if (error) 166 return (error); 167 /* 168 * If updating, check whether changing from read-only to 169 * read/write; if there is no device name, that's all we do. 170 */ 171 if (mp->mnt_flag & MNT_UPDATE) { 172 ump = VFSTOUFS(mp); 173 fs = ump->um_fs; 174 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 175 flags = WRITECLOSE; 176 if (mp->mnt_flag & MNT_FORCE) 177 flags |= FORCECLOSE; 178 if (vfs_busy(mp)) 179 return (EBUSY); 180 error = ffs_flushfiles(mp, flags, p); 181 if (error == 0 && 182 ffs_cgupdate(ump, MNT_WAIT) == 0 && 183 fs->fs_clean & FS_WASCLEAN) { 184 fs->fs_clean = FS_ISCLEAN; 185 (void) ffs_sbupdate(ump, MNT_WAIT); 186 } 187 vfs_unbusy(mp); 188 if (error) 189 return (error); 190 fs->fs_ronly = 1; 191 } 192 if (mp->mnt_flag & MNT_RELOAD) { 193 error = ffs_reload(mp, ndp->ni_cnd.cn_cred, p); 194 if (error) 195 return (error); 196 } 197 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) { 198 /* 199 * If upgrade to read-write by non-root, then verify 200 * that user has necessary permissions on the device. 201 */ 202 if (p->p_ucred->cr_uid != 0) { 203 devvp = ump->um_devvp; 204 VOP_LOCK(devvp); 205 error = VOP_ACCESS(devvp, VREAD | VWRITE, 206 p->p_ucred, p); 207 if (error) { 208 VOP_UNLOCK(devvp); 209 return (error); 210 } 211 VOP_UNLOCK(devvp); 212 } 213 fs->fs_ronly = 0; 214 fs->fs_clean <<= 1; 215 fs->fs_fmod = 1; 216 } 217 if (args.fspec == 0) { 218 /* 219 * Process export requests. 220 */ 221 return (vfs_export(mp, &ump->um_export, &args.export)); 222 } 223 } 224 /* 225 * Not an update, or updating the name: look up the name 226 * and verify that it refers to a sensible block device. 227 */ 228 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 229 if ((error = namei(ndp)) != 0) 230 return (error); 231 devvp = ndp->ni_vp; 232 233 if (devvp->v_type != VBLK) { 234 vrele(devvp); 235 return (ENOTBLK); 236 } 237 if (major(devvp->v_rdev) >= nblkdev) { 238 vrele(devvp); 239 return (ENXIO); 240 } 241 /* 242 * If mount by non-root, then verify that user has necessary 243 * permissions on the device. 244 */ 245 if (p->p_ucred->cr_uid != 0) { 246 accessmode = VREAD; 247 if ((mp->mnt_flag & MNT_RDONLY) == 0) 248 accessmode |= VWRITE; 249 VOP_LOCK(devvp); 250 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 251 if (error) { 252 vput(devvp); 253 return (error); 254 } 255 VOP_UNLOCK(devvp); 256 } 257 if ((mp->mnt_flag & MNT_UPDATE) == 0) 258 error = ffs_mountfs(devvp, mp, p); 259 else { 260 if (devvp != ump->um_devvp) 261 error = EINVAL; /* needs translation */ 262 else 263 vrele(devvp); 264 } 265 if (error) { 266 vrele(devvp); 267 return (error); 268 } 269 ump = VFSTOUFS(mp); 270 fs = ump->um_fs; 271 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 272 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 273 bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN); 274 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 275 &size); 276 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 277 if (fs->fs_fmod != 0) { /* XXX */ 278 fs->fs_fmod = 0; 279 if (fs->fs_clean & FS_WASCLEAN) 280 fs->fs_time = time.tv_sec; 281 else 282 printf("%s: file system not clean; please fsck(8)\n", 283 mp->mnt_stat.f_mntfromname); 284 (void) ffs_cgupdate(ump, MNT_WAIT); 285 } 286 return (0); 287 } 288 289 /* 290 * Reload all incore data for a filesystem (used after running fsck on 291 * the root filesystem and finding things to fix). The filesystem must 292 * be mounted read-only. 293 * 294 * Things to do to update the mount: 295 * 1) invalidate all cached meta-data. 296 * 2) re-read superblock from disk. 297 * 3) re-read summary information from disk. 298 * 4) invalidate all inactive vnodes. 299 * 5) invalidate all cached file data. 300 * 6) re-read inode data for all active vnodes. 301 */ 302 int 303 ffs_reload(mountp, cred, p) 304 register struct mount *mountp; 305 struct ucred *cred; 306 struct proc *p; 307 { 308 register struct vnode *vp, *nvp, *devvp; 309 struct inode *ip; 310 struct csum *space; 311 struct buf *bp; 312 struct fs *fs, *newfs; 313 struct partinfo dpart; 314 int i, blks, size, error; 315 int32_t *lp; 316 317 if ((mountp->mnt_flag & MNT_RDONLY) == 0) 318 return (EINVAL); 319 /* 320 * Step 1: invalidate all cached meta-data. 321 */ 322 devvp = VFSTOUFS(mountp)->um_devvp; 323 if (vinvalbuf(devvp, 0, cred, p, 0, 0)) 324 panic("ffs_reload: dirty1"); 325 /* 326 * Step 2: re-read superblock from disk. 327 */ 328 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0) 329 size = DEV_BSIZE; 330 else 331 size = dpart.disklab->d_secsize; 332 error = bread(devvp, (daddr_t)(SBOFF / size), SBSIZE, NOCRED, &bp); 333 if (error) 334 return (error); 335 newfs = (struct fs *)bp->b_data; 336 if (newfs->fs_magic != FS_MAGIC || newfs->fs_bsize > MAXBSIZE || 337 newfs->fs_bsize < sizeof(struct fs)) { 338 brelse(bp); 339 return (EIO); /* XXX needs translation */ 340 } 341 fs = VFSTOUFS(mountp)->um_fs; 342 /* 343 * Copy pointer fields back into superblock before copying in XXX 344 * new superblock. These should really be in the ufsmount. XXX 345 * Note that important parameters (eg fs_ncg) are unchanged. 346 */ 347 bcopy(&fs->fs_csp[0], &newfs->fs_csp[0], sizeof(fs->fs_csp)); 348 newfs->fs_maxcluster = fs->fs_maxcluster; 349 bcopy(newfs, fs, (u_int)fs->fs_sbsize); 350 if (fs->fs_sbsize < SBSIZE) 351 bp->b_flags |= B_INVAL; 352 brelse(bp); 353 mountp->mnt_maxsymlinklen = fs->fs_maxsymlinklen; 354 ffs_oldfscompat(fs); 355 /* 356 * Step 3: re-read summary information from disk. 357 */ 358 blks = howmany(fs->fs_cssize, fs->fs_fsize); 359 space = fs->fs_csp[0]; 360 for (i = 0; i < blks; i += fs->fs_frag) { 361 size = fs->fs_bsize; 362 if (i + fs->fs_frag > blks) 363 size = (blks - i) * fs->fs_fsize; 364 error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size, 365 NOCRED, &bp); 366 if (error) 367 return (error); 368 bcopy(bp->b_data, fs->fs_csp[fragstoblks(fs, i)], (u_int)size); 369 brelse(bp); 370 } 371 /* 372 * We no longer know anything about clusters per cylinder group. 373 */ 374 if (fs->fs_contigsumsize > 0) { 375 lp = fs->fs_maxcluster; 376 for (i = 0; i < fs->fs_ncg; i++) 377 *lp++ = fs->fs_contigsumsize; 378 } 379 380 loop: 381 for (vp = mountp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 382 nvp = vp->v_mntvnodes.le_next; 383 /* 384 * Step 4: invalidate all inactive vnodes. 385 */ 386 if (vp->v_usecount == 0) { 387 vgone(vp); 388 continue; 389 } 390 /* 391 * Step 5: invalidate all cached file data. 392 */ 393 if (vget(vp, 1)) 394 goto loop; 395 if (vinvalbuf(vp, 0, cred, p, 0, 0)) 396 panic("ffs_reload: dirty2"); 397 /* 398 * Step 6: re-read inode data for all active vnodes. 399 */ 400 ip = VTOI(vp); 401 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 402 (int)fs->fs_bsize, NOCRED, &bp); 403 if (error) { 404 vput(vp); 405 return (error); 406 } 407 ip->i_din.ffs_din = *((struct dinode *)bp->b_data + 408 ino_to_fsbo(fs, ip->i_number)); 409 brelse(bp); 410 vput(vp); 411 if (vp->v_mount != mountp) 412 goto loop; 413 } 414 return (0); 415 } 416 417 /* 418 * Common code for mount and mountroot 419 */ 420 int 421 ffs_mountfs(devvp, mp, p) 422 register struct vnode *devvp; 423 struct mount *mp; 424 struct proc *p; 425 { 426 register struct ufsmount *ump; 427 struct buf *bp; 428 register struct fs *fs; 429 dev_t dev; 430 struct partinfo dpart; 431 caddr_t base, space; 432 int blks; 433 int error, i, size, ronly; 434 int32_t *lp; 435 struct ucred *cred; 436 extern struct vnode *rootvp; 437 u_int64_t maxfilesize; /* XXX */ 438 439 dev = devvp->v_rdev; 440 cred = p ? p->p_ucred : NOCRED; 441 /* 442 * Disallow multiple mounts of the same device. 443 * Disallow mounting of a device that is currently in use 444 * (except for root, which might share swap device for miniroot). 445 * Flush out any old buffers remaining from a previous use. 446 */ 447 if ((error = vfs_mountedon(devvp)) != 0) 448 return (error); 449 if (vcount(devvp) > 1 && devvp != rootvp) 450 return (EBUSY); 451 if ((error = vinvalbuf(devvp, V_SAVE, cred, p, 0, 0)) != 0) 452 return (error); 453 454 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 455 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 456 if (error) 457 return (error); 458 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, cred, p) != 0) 459 size = DEV_BSIZE; 460 else 461 size = dpart.disklab->d_secsize; 462 463 bp = NULL; 464 ump = NULL; 465 error = bread(devvp, (daddr_t)(SBOFF / size), SBSIZE, cred, &bp); 466 if (error) 467 goto out; 468 fs = (struct fs *)bp->b_data; 469 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 470 fs->fs_bsize < sizeof(struct fs)) { 471 error = EINVAL; /* XXX needs translation */ 472 goto out; 473 } 474 /* XXX updating 4.2 FFS superblocks trashes rotational layout tables */ 475 if (fs->fs_postblformat == FS_42POSTBLFMT && !ronly) { 476 error = EROFS; /* XXX what should be returned? */ 477 goto out; 478 } 479 ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK); 480 bzero((caddr_t)ump, sizeof *ump); 481 ump->um_fs = malloc((u_long)fs->fs_sbsize, M_UFSMNT, 482 M_WAITOK); 483 bcopy(bp->b_data, ump->um_fs, (u_int)fs->fs_sbsize); 484 if (fs->fs_sbsize < SBSIZE) 485 bp->b_flags |= B_INVAL; 486 brelse(bp); 487 bp = NULL; 488 fs = ump->um_fs; 489 fs->fs_ronly = ronly; 490 if (ronly == 0) { 491 fs->fs_clean <<= 1; 492 fs->fs_fmod = 1; 493 } 494 size = fs->fs_cssize; 495 blks = howmany(size, fs->fs_fsize); 496 if (fs->fs_contigsumsize > 0) 497 size += fs->fs_ncg * sizeof(int32_t); 498 base = space = malloc((u_long)size, M_UFSMNT, M_WAITOK); 499 for (i = 0; i < blks; i += fs->fs_frag) { 500 size = fs->fs_bsize; 501 if (i + fs->fs_frag > blks) 502 size = (blks - i) * fs->fs_fsize; 503 error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size, 504 cred, &bp); 505 if (error) { 506 free(base, M_UFSMNT); 507 goto out; 508 } 509 bcopy(bp->b_data, space, (u_int)size); 510 fs->fs_csp[fragstoblks(fs, i)] = (struct csum *)space; 511 space += size; 512 brelse(bp); 513 bp = NULL; 514 } 515 if (fs->fs_contigsumsize > 0) { 516 fs->fs_maxcluster = lp = (int32_t *)space; 517 for (i = 0; i < fs->fs_ncg; i++) 518 *lp++ = fs->fs_contigsumsize; 519 } 520 mp->mnt_data = (qaddr_t)ump; 521 mp->mnt_stat.f_fsid.val[0] = (long)dev; 522 mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_FFS); 523 mp->mnt_maxsymlinklen = fs->fs_maxsymlinklen; 524 mp->mnt_flag |= MNT_LOCAL; 525 ump->um_mountp = mp; 526 ump->um_dev = dev; 527 ump->um_devvp = devvp; 528 ump->um_nindir = fs->fs_nindir; 529 ump->um_bptrtodb = fs->fs_fsbtodb; 530 ump->um_seqinc = fs->fs_frag; 531 for (i = 0; i < MAXQUOTAS; i++) 532 ump->um_quotas[i] = NULLVP; 533 devvp->v_specflags |= SI_MOUNTEDON; 534 ffs_oldfscompat(fs); 535 ump->um_savedmaxfilesize = fs->fs_maxfilesize; /* XXX */ 536 maxfilesize = (u_int64_t)0x80000000 * fs->fs_bsize - 1; /* XXX */ 537 if (fs->fs_maxfilesize > maxfilesize) /* XXX */ 538 fs->fs_maxfilesize = maxfilesize; /* XXX */ 539 return (0); 540 out: 541 if (bp) 542 brelse(bp); 543 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, cred, p); 544 if (ump) { 545 free(ump->um_fs, M_UFSMNT); 546 free(ump, M_UFSMNT); 547 mp->mnt_data = (qaddr_t)0; 548 } 549 return (error); 550 } 551 552 /* 553 * Sanity checks for old file systems. 554 * 555 * XXX - goes away some day. 556 */ 557 int 558 ffs_oldfscompat(fs) 559 struct fs *fs; 560 { 561 int i; 562 563 fs->fs_npsect = max(fs->fs_npsect, fs->fs_nsect); /* XXX */ 564 fs->fs_interleave = max(fs->fs_interleave, 1); /* XXX */ 565 if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */ 566 fs->fs_nrpos = 8; /* XXX */ 567 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */ 568 u_int64_t sizepb = fs->fs_bsize; /* XXX */ 569 /* XXX */ 570 fs->fs_maxfilesize = fs->fs_bsize * NDADDR - 1; /* XXX */ 571 for (i = 0; i < NIADDR; i++) { /* XXX */ 572 sizepb *= NINDIR(fs); /* XXX */ 573 fs->fs_maxfilesize += sizepb; /* XXX */ 574 } /* XXX */ 575 fs->fs_qbmask = ~fs->fs_bmask; /* XXX */ 576 fs->fs_qfmask = ~fs->fs_fmask; /* XXX */ 577 } /* XXX */ 578 return (0); 579 } 580 581 /* 582 * unmount system call 583 */ 584 int 585 ffs_unmount(mp, mntflags, p) 586 struct mount *mp; 587 int mntflags; 588 struct proc *p; 589 { 590 register struct ufsmount *ump; 591 register struct fs *fs; 592 int error, flags; 593 594 flags = 0; 595 if (mntflags & MNT_FORCE) 596 flags |= FORCECLOSE; 597 if ((error = ffs_flushfiles(mp, flags, p)) != 0) 598 return (error); 599 ump = VFSTOUFS(mp); 600 fs = ump->um_fs; 601 if (fs->fs_ronly == 0 && 602 ffs_cgupdate(ump, MNT_WAIT) == 0 && 603 fs->fs_clean & FS_WASCLEAN) { 604 fs->fs_clean = FS_ISCLEAN; 605 (void) ffs_sbupdate(ump, MNT_WAIT); 606 } 607 ump->um_devvp->v_specflags &= ~SI_MOUNTEDON; 608 error = VOP_CLOSE(ump->um_devvp, fs->fs_ronly ? FREAD : FREAD|FWRITE, 609 NOCRED, p); 610 vrele(ump->um_devvp); 611 free(fs->fs_csp[0], M_UFSMNT); 612 free(fs, M_UFSMNT); 613 free(ump, M_UFSMNT); 614 mp->mnt_data = (qaddr_t)0; 615 mp->mnt_flag &= ~MNT_LOCAL; 616 return (error); 617 } 618 619 /* 620 * Flush out all the files in a filesystem. 621 */ 622 int 623 ffs_flushfiles(mp, flags, p) 624 register struct mount *mp; 625 int flags; 626 struct proc *p; 627 { 628 extern int doforce; 629 register struct ufsmount *ump; 630 int error; 631 632 if (!doforce) 633 flags &= ~FORCECLOSE; 634 ump = VFSTOUFS(mp); 635 #ifdef QUOTA 636 if (mp->mnt_flag & MNT_QUOTA) { 637 int i; 638 if ((error = vflush(mp, NULLVP, SKIPSYSTEM|flags)) != 0) 639 return (error); 640 for (i = 0; i < MAXQUOTAS; i++) { 641 if (ump->um_quotas[i] == NULLVP) 642 continue; 643 quotaoff(p, mp, i); 644 } 645 /* 646 * Here we fall through to vflush again to ensure 647 * that we have gotten rid of all the system vnodes. 648 */ 649 } 650 #endif 651 error = vflush(mp, NULLVP, flags); 652 return (error); 653 } 654 655 /* 656 * Get file system statistics. 657 */ 658 int 659 ffs_statfs(mp, sbp, p) 660 struct mount *mp; 661 register struct statfs *sbp; 662 struct proc *p; 663 { 664 register struct ufsmount *ump; 665 register struct fs *fs; 666 667 ump = VFSTOUFS(mp); 668 fs = ump->um_fs; 669 if (fs->fs_magic != FS_MAGIC) 670 panic("ffs_statfs"); 671 #ifdef COMPAT_09 672 sbp->f_type = 1; 673 #else 674 sbp->f_type = 0; 675 #endif 676 sbp->f_bsize = fs->fs_fsize; 677 sbp->f_iosize = fs->fs_bsize; 678 sbp->f_blocks = fs->fs_dsize; 679 sbp->f_bfree = fs->fs_cstotal.cs_nbfree * fs->fs_frag + 680 fs->fs_cstotal.cs_nffree; 681 sbp->f_bavail = (fs->fs_dsize * (100 - fs->fs_minfree) / 100) - 682 (fs->fs_dsize - sbp->f_bfree); 683 sbp->f_files = fs->fs_ncg * fs->fs_ipg - ROOTINO; 684 sbp->f_ffree = fs->fs_cstotal.cs_nifree; 685 if (sbp != &mp->mnt_stat) { 686 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 687 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 688 } 689 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 690 return (0); 691 } 692 693 /* 694 * Go through the disk queues to initiate sandbagged IO; 695 * go through the inodes to write those that have been modified; 696 * initiate the writing of the super block if it has been modified. 697 * 698 * Note: we are always called with the filesystem marked `MPBUSY'. 699 */ 700 int 701 ffs_sync(mp, waitfor, cred, p) 702 struct mount *mp; 703 int waitfor; 704 struct ucred *cred; 705 struct proc *p; 706 { 707 register struct vnode *vp; 708 register struct inode *ip; 709 register struct ufsmount *ump = VFSTOUFS(mp); 710 register struct fs *fs; 711 int error, allerror = 0; 712 713 fs = ump->um_fs; 714 /* 715 * Write back modified superblock. 716 * Consistency check that the superblock 717 * is still in the buffer cache. 718 */ 719 if (fs->fs_fmod != 0) { 720 if (fs->fs_ronly != 0) { /* XXX */ 721 printf("fs = %s\n", fs->fs_fsmnt); 722 panic("update: rofs mod"); 723 } 724 fs->fs_fmod = 0; 725 fs->fs_time = time.tv_sec; 726 allerror = ffs_cgupdate(ump, waitfor); 727 } 728 /* 729 * Write back each (modified) inode. 730 */ 731 loop: 732 for (vp = mp->mnt_vnodelist.lh_first; 733 vp != NULL; 734 vp = vp->v_mntvnodes.le_next) { 735 /* 736 * If the vnode that we are about to sync is no longer 737 * associated with this mount point, start over. 738 */ 739 if (vp->v_mount != mp) 740 goto loop; 741 if (VOP_ISLOCKED(vp)) 742 continue; 743 ip = VTOI(vp); 744 if ((ip->i_flag & 745 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 746 vp->v_dirtyblkhd.lh_first == NULL) 747 continue; 748 if (vget(vp, 1)) 749 goto loop; 750 if ((error = VOP_FSYNC(vp, cred, waitfor, p)) != 0) 751 allerror = error; 752 vput(vp); 753 } 754 /* 755 * Force stale file system control information to be flushed. 756 */ 757 if ((error = VOP_FSYNC(ump->um_devvp, cred, waitfor, p)) != 0) 758 allerror = error; 759 #ifdef QUOTA 760 qsync(mp); 761 #endif 762 return (allerror); 763 } 764 765 /* 766 * Look up a FFS dinode number to find its incore vnode, otherwise read it 767 * in from disk. If it is in core, wait for the lock bit to clear, then 768 * return the inode locked. Detection and handling of mount points must be 769 * done by the calling routine. 770 */ 771 int 772 ffs_vget(mp, ino, vpp) 773 struct mount *mp; 774 ino_t ino; 775 struct vnode **vpp; 776 { 777 register struct fs *fs; 778 register struct inode *ip; 779 struct ufsmount *ump; 780 struct buf *bp; 781 struct vnode *vp; 782 dev_t dev; 783 int type, error; 784 785 ump = VFSTOUFS(mp); 786 dev = ump->um_dev; 787 do { 788 if ((*vpp = ufs_ihashget(dev, ino)) != NULL) 789 return (0); 790 } while (lockmgr(&ufs_hashlock, LK_EXCLUSIVE|LK_SLEEPFAIL, 0, curproc)); 791 792 /* Allocate a new vnode/inode. */ 793 if ((error = getnewvnode(VT_UFS, mp, ffs_vnodeop_p, &vp)) != 0) { 794 *vpp = NULL; 795 lockmgr(&ufs_hashlock, LK_RELEASE, 0, curproc); 796 return (error); 797 } 798 type = ump->um_devvp->v_tag == VT_MFS ? M_MFSNODE : M_FFSNODE; /* XXX */ 799 MALLOC(ip, struct inode *, sizeof(struct inode), type, M_WAITOK); 800 bzero((caddr_t)ip, sizeof(struct inode)); 801 vp->v_data = ip; 802 ip->i_vnode = vp; 803 ip->i_fs = fs = ump->um_fs; 804 ip->i_dev = dev; 805 ip->i_number = ino; 806 #ifdef QUOTA 807 { 808 int i; 809 810 for (i = 0; i < MAXQUOTAS; i++) 811 ip->i_dquot[i] = NODQUOT; 812 } 813 #endif 814 /* 815 * Put it onto its hash chain and lock it so that other requests for 816 * this inode will block if they arrive while we are sleeping waiting 817 * for old data structures to be purged or for the contents of the 818 * disk portion of this inode to be read. 819 */ 820 ufs_ihashins(ip); 821 lockmgr(&ufs_hashlock, LK_RELEASE, 0, curproc); 822 823 /* Read in the disk contents for the inode, copy into the inode. */ 824 error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 825 (int)fs->fs_bsize, NOCRED, &bp); 826 if (error) { 827 /* 828 * The inode does not contain anything useful, so it would 829 * be misleading to leave it on its hash chain. With mode 830 * still zero, it will be unlinked and returned to the free 831 * list by vput(). 832 */ 833 vput(vp); 834 brelse(bp); 835 *vpp = NULL; 836 return (error); 837 } 838 ip->i_din.ffs_din = *((struct dinode *)bp->b_data + ino_to_fsbo(fs, ino)); 839 brelse(bp); 840 841 /* 842 * Initialize the vnode from the inode, check for aliases. 843 * Note that the underlying vnode may have changed. 844 */ 845 error = ufs_vinit(mp, ffs_specop_p, FFS_FIFOOPS, &vp); 846 if (error) { 847 vput(vp); 848 *vpp = NULL; 849 return (error); 850 } 851 /* 852 * Finish inode initialization now that aliasing has been resolved. 853 */ 854 ip->i_devvp = ump->um_devvp; 855 VREF(ip->i_devvp); 856 /* 857 * Ensure that uid and gid are correct. This is a temporary 858 * fix until fsck has been changed to do the update. 859 */ 860 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */ 861 ip->i_ffs_uid = ip->i_din.ffs_din.di_ouid; /* XXX */ 862 ip->i_ffs_gid = ip->i_din.ffs_din.di_ogid; /* XXX */ 863 } /* XXX */ 864 865 *vpp = vp; 866 return (0); 867 } 868 869 /* 870 * File handle to vnode 871 * 872 * Have to be really careful about stale file handles: 873 * - check that the inode number is valid 874 * - call ffs_vget() to get the locked inode 875 * - check for an unallocated inode (i_mode == 0) 876 * - check that the given client host has export rights and return 877 * those rights via. exflagsp and credanonp 878 */ 879 int 880 ffs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 881 register struct mount *mp; 882 struct fid *fhp; 883 struct mbuf *nam; 884 struct vnode **vpp; 885 int *exflagsp; 886 struct ucred **credanonp; 887 { 888 register struct ufid *ufhp; 889 struct fs *fs; 890 891 ufhp = (struct ufid *)fhp; 892 fs = VFSTOUFS(mp)->um_fs; 893 if (ufhp->ufid_ino < ROOTINO || 894 ufhp->ufid_ino >= fs->fs_ncg * fs->fs_ipg) 895 return (ESTALE); 896 return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp)); 897 } 898 899 /* 900 * Vnode pointer to File handle 901 */ 902 /* ARGSUSED */ 903 int 904 ffs_vptofh(vp, fhp) 905 struct vnode *vp; 906 struct fid *fhp; 907 { 908 register struct inode *ip; 909 register struct ufid *ufhp; 910 911 ip = VTOI(vp); 912 ufhp = (struct ufid *)fhp; 913 ufhp->ufid_len = sizeof(struct ufid); 914 ufhp->ufid_ino = ip->i_number; 915 ufhp->ufid_gen = ip->i_ffs_gen; 916 return (0); 917 } 918 919 /* 920 * Write a superblock and associated information back to disk. 921 */ 922 int 923 ffs_sbupdate(mp, waitfor) 924 struct ufsmount *mp; 925 int waitfor; 926 { 927 register struct fs *dfs, *fs = mp->um_fs; 928 register struct buf *bp; 929 int i, error = 0; 930 931 bp = getblk(mp->um_devvp, SBOFF >> (fs->fs_fshift - fs->fs_fsbtodb), 932 (int)fs->fs_sbsize, 0, 0); 933 bcopy((caddr_t)fs, bp->b_data, (u_int)fs->fs_sbsize); 934 /* Restore compatibility to old file systems. XXX */ 935 dfs = (struct fs *)bp->b_data; /* XXX */ 936 if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */ 937 dfs->fs_nrpos = -1; /* XXX */ 938 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */ 939 int32_t *lp, tmp; /* XXX */ 940 /* XXX */ 941 lp = (int32_t *)&dfs->fs_qbmask; /* XXX */ 942 tmp = lp[4]; /* XXX */ 943 for (i = 4; i > 0; i--) /* XXX */ 944 lp[i] = lp[i-1]; /* XXX */ 945 lp[0] = tmp; /* XXX */ 946 } /* XXX */ 947 dfs->fs_maxfilesize = mp->um_savedmaxfilesize; /* XXX */ 948 if (waitfor == MNT_WAIT) 949 error = bwrite(bp); 950 else 951 bawrite(bp); 952 return (error); 953 } 954 955 int 956 ffs_cgupdate(mp, waitfor) 957 struct ufsmount *mp; 958 int waitfor; 959 { 960 register struct fs *fs = mp->um_fs; 961 register struct buf *bp; 962 int blks; 963 caddr_t space; 964 int i, size, error = 0, allerror = 0; 965 966 allerror = ffs_sbupdate(mp, waitfor); 967 blks = howmany(fs->fs_cssize, fs->fs_fsize); 968 space = (caddr_t)fs->fs_csp[0]; 969 for (i = 0; i < blks; i += fs->fs_frag) { 970 size = fs->fs_bsize; 971 if (i + fs->fs_frag > blks) 972 size = (blks - i) * fs->fs_fsize; 973 bp = getblk(mp->um_devvp, fsbtodb(fs, fs->fs_csaddr + i), 974 size, 0, 0); 975 bcopy(space, bp->b_data, (u_int)size); 976 space += size; 977 if (waitfor == MNT_WAIT) 978 error = bwrite(bp); 979 else 980 bawrite(bp); 981 } 982 if (!allerror && error) 983 allerror = error; 984 return (allerror); 985 } 986
Indexes created Tue Sep 30 20:09:53 GMT 2025