ffs_vfsops.c revision 1.10
1 /* $NetBSD: ffs_vfsops.c,v 1.10 1994/12/15 19:49:44 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 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 mode_t accessmode; 157 158 if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args))) 159 return (error); 160 /* 161 * If updating, check whether changing from read-only to 162 * read/write; if there is no device name, that's all we do. 163 */ 164 if (mp->mnt_flag & MNT_UPDATE) { 165 ump = VFSTOUFS(mp); 166 fs = ump->um_fs; 167 error = 0; 168 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 169 flags = WRITECLOSE; 170 if (mp->mnt_flag & MNT_FORCE) 171 flags |= FORCECLOSE; 172 if (vfs_busy(mp)) 173 return (EBUSY); 174 error = ffs_flushfiles(mp, flags, p); 175 vfs_unbusy(mp); 176 } 177 if (!error && (mp->mnt_flag & MNT_RELOAD)) 178 error = ffs_reload(mp, ndp->ni_cnd.cn_cred, p); 179 if (error) 180 return (error); 181 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) { 182 /* 183 * If upgrade to read-write by non-root, then verify 184 * that user has necessary permissions on the device. 185 */ 186 if (p->p_ucred->cr_uid != 0) { 187 devvp = ump->um_devvp; 188 VOP_LOCK(devvp); 189 if (error = VOP_ACCESS(devvp, VREAD | VWRITE, 190 p->p_ucred, p)) { 191 VOP_UNLOCK(devvp); 192 return (error); 193 } 194 VOP_UNLOCK(devvp); 195 } 196 fs->fs_ronly = 0; 197 } 198 if (args.fspec == 0) { 199 /* 200 * Process export requests. 201 */ 202 return (vfs_export(mp, &ump->um_export, &args.export)); 203 } 204 } 205 /* 206 * Not an update, or updating the name: look up the name 207 * and verify that it refers to a sensible block device. 208 */ 209 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 210 if (error = namei(ndp)) 211 return (error); 212 devvp = ndp->ni_vp; 213 214 if (devvp->v_type != VBLK) { 215 vrele(devvp); 216 return (ENOTBLK); 217 } 218 if (major(devvp->v_rdev) >= nblkdev) { 219 vrele(devvp); 220 return (ENXIO); 221 } 222 /* 223 * If mount by non-root, then verify that user has necessary 224 * permissions on the device. 225 */ 226 if (p->p_ucred->cr_uid != 0) { 227 accessmode = VREAD; 228 if ((mp->mnt_flag & MNT_RDONLY) == 0) 229 accessmode |= VWRITE; 230 VOP_LOCK(devvp); 231 if (error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p)) { 232 vput(devvp); 233 return (error); 234 } 235 VOP_UNLOCK(devvp); 236 } 237 if ((mp->mnt_flag & MNT_UPDATE) == 0) 238 error = ffs_mountfs(devvp, mp, p); 239 else { 240 if (devvp != ump->um_devvp) 241 error = EINVAL; /* needs translation */ 242 else 243 vrele(devvp); 244 } 245 if (error) { 246 vrele(devvp); 247 return (error); 248 } 249 ump = VFSTOUFS(mp); 250 fs = ump->um_fs; 251 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 252 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 253 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 254 MNAMELEN); 255 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 256 &size); 257 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 258 return (0); 259 } 260 261 /* 262 * Reload all incore data for a filesystem (used after running fsck on 263 * the root filesystem and finding things to fix). The filesystem must 264 * be mounted read-only. 265 * 266 * Things to do to update the mount: 267 * 1) invalidate all cached meta-data. 268 * 2) re-read superblock from disk. 269 * 3) re-read summary information from disk. 270 * 4) invalidate all inactive vnodes. 271 * 5) invalidate all cached file data. 272 * 6) re-read inode data for all active vnodes. 273 */ 274 ffs_reload(mountp, cred, p) 275 register struct mount *mountp; 276 struct ucred *cred; 277 struct proc *p; 278 { 279 register struct vnode *vp, *nvp, *devvp; 280 struct inode *ip; 281 struct csum *space; 282 struct buf *bp; 283 struct fs *fs; 284 struct partinfo dpart; 285 int i, blks, size, error; 286 287 if ((mountp->mnt_flag & MNT_RDONLY) == 0) 288 return (EINVAL); 289 /* 290 * Step 1: invalidate all cached meta-data. 291 */ 292 devvp = VFSTOUFS(mountp)->um_devvp; 293 if (vinvalbuf(devvp, 0, cred, p, 0, 0)) 294 panic("ffs_reload: dirty1"); 295 /* 296 * Step 2: re-read superblock from disk. 297 */ 298 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0) 299 size = DEV_BSIZE; 300 else 301 size = dpart.disklab->d_secsize; 302 if (error = bread(devvp, (daddr_t)(SBOFF / size), SBSIZE, NOCRED, &bp)) 303 return (error); 304 fs = (struct fs *)bp->b_data; 305 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 306 fs->fs_bsize < sizeof(struct fs)) { 307 brelse(bp); 308 return (EIO); /* XXX needs translation */ 309 } 310 fs = VFSTOUFS(mountp)->um_fs; 311 bcopy(&fs->fs_csp[0], &((struct fs *)bp->b_data)->fs_csp[0], 312 sizeof(fs->fs_csp)); 313 bcopy(bp->b_data, fs, (u_int)fs->fs_sbsize); 314 if (fs->fs_sbsize < SBSIZE) 315 bp->b_flags |= B_INVAL; 316 brelse(bp); 317 mountp->mnt_maxsymlinklen = fs->fs_maxsymlinklen; 318 ffs_oldfscompat(fs); 319 /* 320 * Step 3: re-read summary information from disk. 321 */ 322 blks = howmany(fs->fs_cssize, fs->fs_fsize); 323 space = fs->fs_csp[0]; 324 for (i = 0; i < blks; i += fs->fs_frag) { 325 size = fs->fs_bsize; 326 if (i + fs->fs_frag > blks) 327 size = (blks - i) * fs->fs_fsize; 328 if (error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size, 329 NOCRED, &bp)) 330 return (error); 331 bcopy(bp->b_data, fs->fs_csp[fragstoblks(fs, i)], (u_int)size); 332 brelse(bp); 333 } 334 loop: 335 for (vp = mountp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 336 nvp = vp->v_mntvnodes.le_next; 337 /* 338 * Step 4: invalidate all inactive vnodes. 339 */ 340 if (vp->v_usecount == 0) { 341 vgone(vp); 342 continue; 343 } 344 /* 345 * Step 5: invalidate all cached file data. 346 */ 347 if (vget(vp, 1)) 348 goto loop; 349 if (vinvalbuf(vp, 0, cred, p, 0, 0)) 350 panic("ffs_reload: dirty2"); 351 /* 352 * Step 6: re-read inode data for all active vnodes. 353 */ 354 ip = VTOI(vp); 355 if (error = 356 bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 357 (int)fs->fs_bsize, NOCRED, &bp)) { 358 vput(vp); 359 return (error); 360 } 361 ip->i_din = *((struct dinode *)bp->b_data + 362 ino_to_fsbo(fs, ip->i_number)); 363 brelse(bp); 364 vput(vp); 365 if (vp->v_mount != mountp) 366 goto loop; 367 } 368 return (0); 369 } 370 371 /* 372 * Common code for mount and mountroot 373 */ 374 int 375 ffs_mountfs(devvp, mp, p) 376 register struct vnode *devvp; 377 struct mount *mp; 378 struct proc *p; 379 { 380 register struct ufsmount *ump; 381 struct buf *bp; 382 register struct fs *fs; 383 dev_t dev; 384 struct partinfo dpart; 385 caddr_t base, space; 386 int blks; 387 int error, i, size, ronly; 388 int32_t *lp; 389 struct ucred *cred; 390 extern struct vnode *rootvp; 391 u_int64_t maxfilesize; /* XXX */ 392 393 dev = devvp->v_rdev; 394 cred = p ? p->p_ucred : NOCRED; 395 /* 396 * Disallow multiple mounts of the same device. 397 * Disallow mounting of a device that is currently in use 398 * (except for root, which might share swap device for miniroot). 399 * Flush out any old buffers remaining from a previous use. 400 */ 401 if (error = vfs_mountedon(devvp)) 402 return (error); 403 if (vcount(devvp) > 1 && devvp != rootvp) 404 return (EBUSY); 405 if (error = vinvalbuf(devvp, V_SAVE, cred, p, 0, 0)) 406 return (error); 407 408 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 409 if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p)) 410 return (error); 411 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, cred, p) != 0) 412 size = DEV_BSIZE; 413 else 414 size = dpart.disklab->d_secsize; 415 416 bp = NULL; 417 ump = NULL; 418 if (error = bread(devvp, (daddr_t)(SBOFF / size), SBSIZE, cred, &bp)) 419 goto out; 420 fs = (struct fs *)bp->b_data; 421 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 422 fs->fs_bsize < sizeof(struct fs)) { 423 error = EINVAL; /* XXX needs translation */ 424 goto out; 425 } 426 /* XXX updating 4.2 FFS superblocks trashes rotational layout tables */ 427 if (fs->fs_postblformat == FS_42POSTBLFMT && !ronly) { 428 error = EROFS; /* XXX what should be returned? */ 429 goto out; 430 } 431 ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK); 432 bzero((caddr_t)ump, sizeof *ump); 433 ump->um_fs = malloc((u_long)fs->fs_sbsize, M_UFSMNT, 434 M_WAITOK); 435 bcopy(bp->b_data, ump->um_fs, (u_int)fs->fs_sbsize); 436 if (fs->fs_sbsize < SBSIZE) 437 bp->b_flags |= B_INVAL; 438 brelse(bp); 439 bp = NULL; 440 fs = ump->um_fs; 441 fs->fs_ronly = ronly; 442 if (ronly == 0) 443 fs->fs_fmod = 1; 444 size = fs->fs_cssize; 445 blks = howmany(size, fs->fs_fsize); 446 if (fs->fs_contigsumsize > 0) 447 size += fs->fs_ncg * sizeof(int32_t); 448 base = space = malloc((u_long)size, M_UFSMNT, M_WAITOK); 449 for (i = 0; i < blks; i += fs->fs_frag) { 450 size = fs->fs_bsize; 451 if (i + fs->fs_frag > blks) 452 size = (blks - i) * fs->fs_fsize; 453 if (error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size, 454 cred, &bp)) { 455 free(base, M_UFSMNT); 456 goto out; 457 } 458 bcopy(bp->b_data, space, (u_int)size); 459 fs->fs_csp[fragstoblks(fs, i)] = (struct csum *)space; 460 space += size; 461 brelse(bp); 462 bp = NULL; 463 } 464 if (fs->fs_contigsumsize > 0) { 465 fs->fs_maxcluster = lp = (int32_t *)space; 466 for (i = 0; i < fs->fs_ncg; i++) 467 *lp++ = fs->fs_contigsumsize; 468 } 469 mp->mnt_data = (qaddr_t)ump; 470 mp->mnt_stat.f_fsid.val[0] = (long)dev; 471 mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_UFS); 472 mp->mnt_maxsymlinklen = fs->fs_maxsymlinklen; 473 mp->mnt_flag |= MNT_LOCAL; 474 ump->um_mountp = mp; 475 ump->um_dev = dev; 476 ump->um_devvp = devvp; 477 ump->um_nindir = fs->fs_nindir; 478 ump->um_bptrtodb = fs->fs_fsbtodb; 479 ump->um_seqinc = fs->fs_frag; 480 for (i = 0; i < MAXQUOTAS; i++) 481 ump->um_quotas[i] = NULLVP; 482 devvp->v_specflags |= SI_MOUNTEDON; 483 ffs_oldfscompat(fs); 484 ump->um_savedmaxfilesize = fs->fs_maxfilesize; /* XXX */ 485 maxfilesize = (u_int64_t)0x80000000 * fs->fs_bsize - 1; /* XXX */ 486 if (fs->fs_maxfilesize > maxfilesize) /* XXX */ 487 fs->fs_maxfilesize = maxfilesize; /* XXX */ 488 return (0); 489 out: 490 if (bp) 491 brelse(bp); 492 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, cred, p); 493 if (ump) { 494 free(ump->um_fs, M_UFSMNT); 495 free(ump, M_UFSMNT); 496 mp->mnt_data = (qaddr_t)0; 497 } 498 return (error); 499 } 500 501 /* 502 * Sanity checks for old file systems. 503 * 504 * XXX - goes away some day. 505 */ 506 ffs_oldfscompat(fs) 507 struct fs *fs; 508 { 509 int i; 510 511 fs->fs_npsect = max(fs->fs_npsect, fs->fs_nsect); /* XXX */ 512 fs->fs_interleave = max(fs->fs_interleave, 1); /* XXX */ 513 if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */ 514 fs->fs_nrpos = 8; /* XXX */ 515 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */ 516 u_int64_t sizepb = fs->fs_bsize; /* XXX */ 517 /* XXX */ 518 fs->fs_maxfilesize = fs->fs_bsize * NDADDR - 1; /* XXX */ 519 for (i = 0; i < NIADDR; i++) { /* XXX */ 520 sizepb *= NINDIR(fs); /* XXX */ 521 fs->fs_maxfilesize += sizepb; /* XXX */ 522 } /* XXX */ 523 fs->fs_qbmask = ~fs->fs_bmask; /* XXX */ 524 fs->fs_qfmask = ~fs->fs_fmask; /* XXX */ 525 } /* XXX */ 526 return (0); 527 } 528 529 /* 530 * unmount system call 531 */ 532 int 533 ffs_unmount(mp, mntflags, p) 534 struct mount *mp; 535 int mntflags; 536 struct proc *p; 537 { 538 register struct ufsmount *ump; 539 register struct fs *fs; 540 int error, flags; 541 542 flags = 0; 543 if (mntflags & MNT_FORCE) { 544 if (mp->mnt_flag & MNT_ROOTFS) 545 return (EINVAL); 546 flags |= FORCECLOSE; 547 } 548 if (error = ffs_flushfiles(mp, flags, p)) 549 return (error); 550 ump = VFSTOUFS(mp); 551 fs = ump->um_fs; 552 ump->um_devvp->v_specflags &= ~SI_MOUNTEDON; 553 error = VOP_CLOSE(ump->um_devvp, fs->fs_ronly ? FREAD : FREAD|FWRITE, 554 NOCRED, p); 555 vrele(ump->um_devvp); 556 free(fs->fs_csp[0], M_UFSMNT); 557 free(fs, M_UFSMNT); 558 free(ump, M_UFSMNT); 559 mp->mnt_data = (qaddr_t)0; 560 mp->mnt_flag &= ~MNT_LOCAL; 561 return (error); 562 } 563 564 /* 565 * Flush out all the files in a filesystem. 566 */ 567 ffs_flushfiles(mp, flags, p) 568 register struct mount *mp; 569 int flags; 570 struct proc *p; 571 { 572 extern int doforce; 573 register struct ufsmount *ump; 574 int i, error; 575 576 if (!doforce) 577 flags &= ~FORCECLOSE; 578 ump = VFSTOUFS(mp); 579 #ifdef QUOTA 580 if (mp->mnt_flag & MNT_QUOTA) { 581 if (error = vflush(mp, NULLVP, SKIPSYSTEM|flags)) 582 return (error); 583 for (i = 0; i < MAXQUOTAS; i++) { 584 if (ump->um_quotas[i] == NULLVP) 585 continue; 586 quotaoff(p, mp, i); 587 } 588 /* 589 * Here we fall through to vflush again to ensure 590 * that we have gotten rid of all the system vnodes. 591 */ 592 } 593 #endif 594 error = vflush(mp, NULLVP, flags); 595 return (error); 596 } 597 598 /* 599 * Get file system statistics. 600 */ 601 int 602 ffs_statfs(mp, sbp, p) 603 struct mount *mp; 604 register struct statfs *sbp; 605 struct proc *p; 606 { 607 register struct ufsmount *ump; 608 register struct fs *fs; 609 610 ump = VFSTOUFS(mp); 611 fs = ump->um_fs; 612 if (fs->fs_magic != FS_MAGIC) 613 panic("ffs_statfs"); 614 #ifdef COMPAT_09 615 sbp->f_type = 1; 616 #else 617 sbp->f_type = 0; 618 #endif 619 sbp->f_bsize = fs->fs_fsize; 620 sbp->f_iosize = fs->fs_bsize; 621 sbp->f_blocks = fs->fs_dsize; 622 sbp->f_bfree = fs->fs_cstotal.cs_nbfree * fs->fs_frag + 623 fs->fs_cstotal.cs_nffree; 624 sbp->f_bavail = (fs->fs_dsize * (100 - fs->fs_minfree) / 100) - 625 (fs->fs_dsize - sbp->f_bfree); 626 sbp->f_files = fs->fs_ncg * fs->fs_ipg - ROOTINO; 627 sbp->f_ffree = fs->fs_cstotal.cs_nifree; 628 if (sbp != &mp->mnt_stat) { 629 bcopy((caddr_t)mp->mnt_stat.f_mntonname, 630 (caddr_t)&sbp->f_mntonname[0], MNAMELEN); 631 bcopy((caddr_t)mp->mnt_stat.f_mntfromname, 632 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN); 633 } 634 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 635 sbp->f_fstypename[MFSNAMELEN] = '\0'; 636 return (0); 637 } 638 639 /* 640 * Go through the disk queues to initiate sandbagged IO; 641 * go through the inodes to write those that have been modified; 642 * initiate the writing of the super block if it has been modified. 643 * 644 * Note: we are always called with the filesystem marked `MPBUSY'. 645 */ 646 int 647 ffs_sync(mp, waitfor, cred, p) 648 struct mount *mp; 649 int waitfor; 650 struct ucred *cred; 651 struct proc *p; 652 { 653 register struct vnode *vp; 654 register struct inode *ip; 655 register struct ufsmount *ump = VFSTOUFS(mp); 656 register struct fs *fs; 657 int error, allerror = 0; 658 659 fs = ump->um_fs; 660 /* 661 * Write back modified superblock. 662 * Consistency check that the superblock 663 * is still in the buffer cache. 664 */ 665 if (fs->fs_fmod != 0) { 666 if (fs->fs_ronly != 0) { /* XXX */ 667 printf("fs = %s\n", fs->fs_fsmnt); 668 panic("update: rofs mod"); 669 } 670 fs->fs_fmod = 0; 671 fs->fs_time = time.tv_sec; 672 allerror = ffs_sbupdate(ump, waitfor); 673 } 674 /* 675 * Write back each (modified) inode. 676 */ 677 loop: 678 for (vp = mp->mnt_vnodelist.lh_first; 679 vp != NULL; 680 vp = vp->v_mntvnodes.le_next) { 681 /* 682 * If the vnode that we are about to sync is no longer 683 * associated with this mount point, start over. 684 */ 685 if (vp->v_mount != mp) 686 goto loop; 687 if (VOP_ISLOCKED(vp)) 688 continue; 689 ip = VTOI(vp); 690 if ((ip->i_flag & 691 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 692 vp->v_dirtyblkhd.lh_first == NULL) 693 continue; 694 if (vget(vp, 1)) 695 goto loop; 696 if (error = VOP_FSYNC(vp, cred, waitfor, p)) 697 allerror = error; 698 vput(vp); 699 } 700 /* 701 * Force stale file system control information to be flushed. 702 */ 703 if (error = VOP_FSYNC(ump->um_devvp, cred, waitfor, p)) 704 allerror = error; 705 #ifdef QUOTA 706 qsync(mp); 707 #endif 708 return (allerror); 709 } 710 711 /* 712 * Look up a FFS dinode number to find its incore vnode, otherwise read it 713 * in from disk. If it is in core, wait for the lock bit to clear, then 714 * return the inode locked. Detection and handling of mount points must be 715 * done by the calling routine. 716 */ 717 int 718 ffs_vget(mp, ino, vpp) 719 struct mount *mp; 720 ino_t ino; 721 struct vnode **vpp; 722 { 723 register struct fs *fs; 724 register struct inode *ip; 725 struct ufsmount *ump; 726 struct buf *bp; 727 struct vnode *vp; 728 dev_t dev; 729 int i, type, error; 730 731 ump = VFSTOUFS(mp); 732 dev = ump->um_dev; 733 if ((*vpp = ufs_ihashget(dev, ino)) != NULL) 734 return (0); 735 736 /* Allocate a new vnode/inode. */ 737 if (error = getnewvnode(VT_UFS, mp, ffs_vnodeop_p, &vp)) { 738 *vpp = NULL; 739 return (error); 740 } 741 type = ump->um_devvp->v_tag == VT_MFS ? M_MFSNODE : M_FFSNODE; /* XXX */ 742 MALLOC(ip, struct inode *, sizeof(struct inode), type, M_WAITOK); 743 bzero((caddr_t)ip, sizeof(struct inode)); 744 vp->v_data = ip; 745 ip->i_vnode = vp; 746 ip->i_fs = fs = ump->um_fs; 747 ip->i_dev = dev; 748 ip->i_number = ino; 749 #ifdef QUOTA 750 for (i = 0; i < MAXQUOTAS; i++) 751 ip->i_dquot[i] = NODQUOT; 752 #endif 753 /* 754 * Put it onto its hash chain and lock it so that other requests for 755 * this inode will block if they arrive while we are sleeping waiting 756 * for old data structures to be purged or for the contents of the 757 * disk portion of this inode to be read. 758 */ 759 ufs_ihashins(ip); 760 761 /* Read in the disk contents for the inode, copy into the inode. */ 762 if (error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 763 (int)fs->fs_bsize, NOCRED, &bp)) { 764 /* 765 * The inode does not contain anything useful, so it would 766 * be misleading to leave it on its hash chain. With mode 767 * still zero, it will be unlinked and returned to the free 768 * list by vput(). 769 */ 770 vput(vp); 771 brelse(bp); 772 *vpp = NULL; 773 return (error); 774 } 775 ip->i_din = *((struct dinode *)bp->b_data + ino_to_fsbo(fs, ino)); 776 brelse(bp); 777 778 /* 779 * Initialize the vnode from the inode, check for aliases. 780 * Note that the underlying vnode may have changed. 781 */ 782 if (error = ufs_vinit(mp, ffs_specop_p, FFS_FIFOOPS, &vp)) { 783 vput(vp); 784 *vpp = NULL; 785 return (error); 786 } 787 /* 788 * Finish inode initialization now that aliasing has been resolved. 789 */ 790 ip->i_devvp = ump->um_devvp; 791 VREF(ip->i_devvp); 792 /* 793 * Set up a generation number for this inode if it does not 794 * already have one. This should only happen on old filesystems. 795 */ 796 if (ip->i_gen == 0) { 797 if (++nextgennumber < (u_long)time.tv_sec) 798 nextgennumber = time.tv_sec; 799 ip->i_gen = nextgennumber; 800 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 801 ip->i_flag |= IN_MODIFIED; 802 } 803 /* 804 * Ensure that uid and gid are correct. This is a temporary 805 * fix until fsck has been changed to do the update. 806 */ 807 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */ 808 ip->i_uid = ip->i_din.di_ouid; /* XXX */ 809 ip->i_gid = ip->i_din.di_ogid; /* XXX */ 810 } /* XXX */ 811 812 *vpp = vp; 813 return (0); 814 } 815 816 /* 817 * File handle to vnode 818 * 819 * Have to be really careful about stale file handles: 820 * - check that the inode number is valid 821 * - call ffs_vget() to get the locked inode 822 * - check for an unallocated inode (i_mode == 0) 823 * - check that the given client host has export rights and return 824 * those rights via. exflagsp and credanonp 825 */ 826 int 827 ffs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 828 register struct mount *mp; 829 struct fid *fhp; 830 struct mbuf *nam; 831 struct vnode **vpp; 832 int *exflagsp; 833 struct ucred **credanonp; 834 { 835 register struct ufid *ufhp; 836 struct fs *fs; 837 838 ufhp = (struct ufid *)fhp; 839 fs = VFSTOUFS(mp)->um_fs; 840 if (ufhp->ufid_ino < ROOTINO || 841 ufhp->ufid_ino >= fs->fs_ncg * fs->fs_ipg) 842 return (ESTALE); 843 return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp)); 844 } 845 846 /* 847 * Vnode pointer to File handle 848 */ 849 /* ARGSUSED */ 850 ffs_vptofh(vp, fhp) 851 struct vnode *vp; 852 struct fid *fhp; 853 { 854 register struct inode *ip; 855 register struct ufid *ufhp; 856 857 ip = VTOI(vp); 858 ufhp = (struct ufid *)fhp; 859 ufhp->ufid_len = sizeof(struct ufid); 860 ufhp->ufid_ino = ip->i_number; 861 ufhp->ufid_gen = ip->i_gen; 862 return (0); 863 } 864 865 /* 866 * Write a superblock and associated information back to disk. 867 */ 868 int 869 ffs_sbupdate(mp, waitfor) 870 struct ufsmount *mp; 871 int waitfor; 872 { 873 register struct fs *dfs, *fs = mp->um_fs; 874 register struct buf *bp; 875 int blks; 876 caddr_t space; 877 int i, size, error = 0; 878 879 bp = getblk(mp->um_devvp, SBOFF >> (fs->fs_fshift - fs->fs_fsbtodb), 880 (int)fs->fs_sbsize, 0, 0); 881 bcopy((caddr_t)fs, bp->b_data, (u_int)fs->fs_sbsize); 882 /* Restore compatibility to old file systems. XXX */ 883 dfs = (struct fs *)bp->b_data; /* XXX */ 884 if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */ 885 dfs->fs_nrpos = -1; /* XXX */ 886 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */ 887 int32_t *lp, tmp; /* XXX */ 888 /* XXX */ 889 lp = (int32_t *)&dfs->fs_qbmask; /* XXX */ 890 tmp = lp[4]; /* XXX */ 891 for (i = 4; i > 0; i--) /* XXX */ 892 lp[i] = lp[i-1]; /* XXX */ 893 lp[0] = tmp; /* XXX */ 894 } /* XXX */ 895 dfs->fs_maxfilesize = mp->um_savedmaxfilesize; /* XXX */ 896 if (waitfor == MNT_WAIT) 897 error = bwrite(bp); 898 else 899 bawrite(bp); 900 blks = howmany(fs->fs_cssize, fs->fs_fsize); 901 space = (caddr_t)fs->fs_csp[0]; 902 for (i = 0; i < blks; i += fs->fs_frag) { 903 size = fs->fs_bsize; 904 if (i + fs->fs_frag > blks) 905 size = (blks - i) * fs->fs_fsize; 906 bp = getblk(mp->um_devvp, fsbtodb(fs, fs->fs_csaddr + i), 907 size, 0, 0); 908 bcopy(space, bp->b_data, (u_int)size); 909 space += size; 910 if (waitfor == MNT_WAIT) 911 error = bwrite(bp); 912 else 913 bawrite(bp); 914 } 915 return (error); 916 } 917
Indexes created Mon Oct 20 20:10:13 GMT 2025