lfs_vfsops.c revision 1.48
1 /* $NetBSD: lfs_vfsops.c,v 1.48 2000/03/30 12:41:13 augustss Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Konrad E. Schroder <perseant (at) hhhh.org>. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 /*- 39 * Copyright (c) 1989, 1991, 1993, 1994 40 * The Regents of the University of California. All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by the University of 53 * California, Berkeley and its contributors. 54 * 4. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 * @(#)lfs_vfsops.c 8.20 (Berkeley) 6/10/95 71 */ 72 73 #if defined(_KERNEL) && !defined(_LKM) 74 #include "opt_quota.h" 75 #endif 76 77 #include <sys/param.h> 78 #include <sys/systm.h> 79 #include <sys/namei.h> 80 #include <sys/proc.h> 81 #include <sys/kernel.h> 82 #include <sys/vnode.h> 83 #include <sys/mount.h> 84 #include <sys/buf.h> 85 #include <sys/device.h> 86 #include <sys/mbuf.h> 87 #include <sys/file.h> 88 #include <sys/disklabel.h> 89 #include <sys/ioctl.h> 90 #include <sys/errno.h> 91 #include <sys/malloc.h> 92 #include <sys/pool.h> 93 #include <sys/socket.h> 94 #include <vm/vm.h> 95 #include <sys/sysctl.h> 96 97 #include <miscfs/specfs/specdev.h> 98 99 #include <ufs/ufs/quota.h> 100 #include <ufs/ufs/inode.h> 101 #include <ufs/ufs/ufsmount.h> 102 #include <ufs/ufs/ufs_extern.h> 103 104 #include <ufs/lfs/lfs.h> 105 #include <ufs/lfs/lfs_extern.h> 106 107 int lfs_mountfs __P((struct vnode *, struct mount *, struct proc *)); 108 109 extern struct vnodeopv_desc lfs_vnodeop_opv_desc; 110 extern struct vnodeopv_desc lfs_specop_opv_desc; 111 extern struct vnodeopv_desc lfs_fifoop_opv_desc; 112 113 struct vnodeopv_desc *lfs_vnodeopv_descs[] = { 114 &lfs_vnodeop_opv_desc, 115 &lfs_specop_opv_desc, 116 &lfs_fifoop_opv_desc, 117 NULL, 118 }; 119 120 struct vfsops lfs_vfsops = { 121 MOUNT_LFS, 122 lfs_mount, 123 ufs_start, 124 lfs_unmount, 125 ufs_root, 126 ufs_quotactl, 127 lfs_statfs, 128 lfs_sync, 129 lfs_vget, 130 lfs_fhtovp, 131 lfs_vptofh, 132 lfs_init, 133 lfs_done, 134 lfs_sysctl, 135 lfs_mountroot, 136 ufs_check_export, 137 lfs_vnodeopv_descs, 138 }; 139 140 struct pool lfs_inode_pool; 141 142 /* 143 * Initialize the filesystem, most work done by ufs_init. 144 */ 145 void 146 lfs_init() 147 { 148 ufs_init(); 149 150 /* 151 * XXX Same structure as FFS inodes? Should we share a common pool? 152 */ 153 pool_init(&lfs_inode_pool, sizeof(struct inode), 0, 0, 0, 154 "lfsinopl", 0, pool_page_alloc_nointr, pool_page_free_nointr, 155 M_LFSNODE); 156 } 157 158 void 159 lfs_done() 160 { 161 ufs_done(); 162 pool_destroy(&lfs_inode_pool); 163 } 164 165 /* 166 * Called by main() when ufs is going to be mounted as root. 167 */ 168 int 169 lfs_mountroot() 170 { 171 extern struct vnode *rootvp; 172 struct mount *mp; 173 struct proc *p = curproc; /* XXX */ 174 int error; 175 176 if (root_device->dv_class != DV_DISK) 177 return (ENODEV); 178 179 if (rootdev == NODEV) 180 return (ENODEV); 181 /* 182 * Get vnodes for swapdev and rootdev. 183 */ 184 if ((error = bdevvp(rootdev, &rootvp))) { 185 printf("lfs_mountroot: can't setup bdevvp's"); 186 return (error); 187 } 188 if ((error = vfs_rootmountalloc(MOUNT_LFS, "root_device", &mp))) { 189 vrele(rootvp); 190 return (error); 191 } 192 if ((error = lfs_mountfs(rootvp, mp, p))) { 193 mp->mnt_op->vfs_refcount--; 194 vfs_unbusy(mp); 195 free(mp, M_MOUNT); 196 vrele(rootvp); 197 return (error); 198 } 199 simple_lock(&mountlist_slock); 200 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 201 simple_unlock(&mountlist_slock); 202 (void)lfs_statfs(mp, &mp->mnt_stat, p); 203 vfs_unbusy(mp); 204 return (0); 205 } 206 207 /* 208 * VFS Operations. 209 * 210 * mount system call 211 */ 212 int 213 lfs_mount(mp, path, data, ndp, p) 214 struct mount *mp; 215 const char *path; 216 void *data; 217 struct nameidata *ndp; 218 struct proc *p; 219 { 220 struct vnode *devvp; 221 struct ufs_args args; 222 struct ufsmount *ump = NULL; 223 struct lfs *fs = NULL; /* LFS */ 224 size_t size; 225 int error; 226 mode_t accessmode; 227 228 error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)); 229 if (error) 230 return (error); 231 232 #if 0 233 /* Until LFS can do NFS right. XXX */ 234 if (args.export.ex_flags & MNT_EXPORTED) 235 return (EINVAL); 236 #endif 237 238 /* 239 * If updating, check whether changing from read-only to 240 * read/write; if there is no device name, that's all we do. 241 */ 242 if (mp->mnt_flag & MNT_UPDATE) { 243 ump = VFSTOUFS(mp); 244 fs = ump->um_lfs; 245 if (fs->lfs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) { 246 /* 247 * If upgrade to read-write by non-root, then verify 248 * that user has necessary permissions on the device. 249 */ 250 if (p->p_ucred->cr_uid != 0) { 251 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 252 error = VOP_ACCESS(ump->um_devvp, VREAD|VWRITE, 253 p->p_ucred, p); 254 VOP_UNLOCK(ump->um_devvp, 0); 255 if (error) 256 return (error); 257 } 258 fs->lfs_ronly = 0; 259 } 260 if (args.fspec == 0) { 261 /* 262 * Process export requests. 263 */ 264 return (vfs_export(mp, &ump->um_export, &args.export)); 265 } 266 } 267 /* 268 * Not an update, or updating the name: look up the name 269 * and verify that it refers to a sensible block device. 270 */ 271 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 272 if ((error = namei(ndp)) != 0) 273 return (error); 274 devvp = ndp->ni_vp; 275 if (devvp->v_type != VBLK) { 276 vrele(devvp); 277 return (ENOTBLK); 278 } 279 if (major(devvp->v_rdev) >= nblkdev) { 280 vrele(devvp); 281 return (ENXIO); 282 } 283 /* 284 * If mount by non-root, then verify that user has necessary 285 * permissions on the device. 286 */ 287 if (p->p_ucred->cr_uid != 0) { 288 accessmode = VREAD; 289 if ((mp->mnt_flag & MNT_RDONLY) == 0) 290 accessmode |= VWRITE; 291 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 292 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 293 if (error) { 294 vput(devvp); 295 return (error); 296 } 297 VOP_UNLOCK(devvp, 0); 298 } 299 if ((mp->mnt_flag & MNT_UPDATE) == 0) 300 error = lfs_mountfs(devvp, mp, p); /* LFS */ 301 else { 302 if (devvp != ump->um_devvp) 303 error = EINVAL; /* needs translation */ 304 else 305 vrele(devvp); 306 } 307 if (error) { 308 vrele(devvp); 309 return (error); 310 } 311 ump = VFSTOUFS(mp); 312 fs = ump->um_lfs; /* LFS */ 313 (void)copyinstr(path, fs->lfs_fsmnt, sizeof(fs->lfs_fsmnt) - 1, &size); 314 bzero(fs->lfs_fsmnt + size, sizeof(fs->lfs_fsmnt) - size); 315 bcopy(fs->lfs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN); 316 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 317 &size); 318 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 319 return (0); 320 } 321 322 /* 323 * Common code for mount and mountroot 324 * LFS specific 325 */ 326 int 327 lfs_mountfs(devvp, mp, p) 328 struct vnode *devvp; 329 struct mount *mp; 330 struct proc *p; 331 { 332 extern struct vnode *rootvp; 333 struct dlfs *dfs, *adfs; 334 struct lfs *fs; 335 struct ufsmount *ump; 336 struct vnode *vp; 337 struct buf *bp, *abp; 338 struct partinfo dpart; 339 dev_t dev; 340 int error, i, ronly, size; 341 struct ucred *cred; 342 SEGUSE *sup; 343 344 cred = p ? p->p_ucred : NOCRED; 345 /* 346 * Disallow multiple mounts of the same device. 347 * Disallow mounting of a device that is currently in use 348 * (except for root, which might share swap device for miniroot). 349 * Flush out any old buffers remaining from a previous use. 350 */ 351 if ((error = vfs_mountedon(devvp)) != 0) 352 return (error); 353 if (vcount(devvp) > 1 && devvp != rootvp) 354 return (EBUSY); 355 if ((error = vinvalbuf(devvp, V_SAVE, cred, p, 0, 0)) != 0) 356 return (error); 357 358 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 359 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 360 if (error) 361 return (error); 362 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, cred, p) != 0) 363 size = DEV_BSIZE; 364 else 365 size = dpart.disklab->d_secsize; 366 367 /* Don't free random space on error. */ 368 bp = NULL; 369 ump = NULL; 370 371 /* Read in the superblock. */ 372 error = bread(devvp, LFS_LABELPAD / size, LFS_SBPAD, cred, &bp); 373 if (error) 374 goto out; 375 dfs = (struct dlfs *)bp->b_data; 376 377 /* 378 * Check the second superblock to see which is newer; then mount 379 * using the older of the two. This is necessary to ensure that 380 * the filesystem is valid if it was not unmounted cleanly. 381 */ 382 error = bread(devvp, dfs->dlfs_sboffs[1], LFS_SBPAD, cred, &abp); 383 if (error) 384 goto out; 385 adfs = (struct dlfs *)abp->b_data; 386 387 if (adfs->dlfs_tstamp < dfs->dlfs_tstamp) /* XXX KS - 1s resolution? */ 388 dfs = adfs; 389 390 /* Check the basics. */ 391 if (dfs->dlfs_magic != LFS_MAGIC || dfs->dlfs_bsize > MAXBSIZE || 392 dfs->dlfs_version > LFS_VERSION || 393 dfs->dlfs_bsize < sizeof(struct dlfs)) { 394 error = EINVAL; /* XXX needs translation */ 395 goto out; 396 } 397 398 /* Allocate the mount structure, copy the superblock into it. */ 399 fs = malloc(sizeof(struct lfs), M_UFSMNT, M_WAITOK); 400 memcpy(&fs->lfs_dlfs, dfs, sizeof(struct dlfs)); 401 ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK); 402 memset((caddr_t)ump, 0, sizeof *ump); 403 ump->um_lfs = fs; 404 if (sizeof(struct lfs) < LFS_SBPAD) /* XXX why? */ 405 bp->b_flags |= B_INVAL; 406 brelse(bp); 407 bp = NULL; 408 brelse(abp); 409 abp = NULL; 410 411 /* Set up the I/O information */ 412 fs->lfs_iocount = 0; 413 fs->lfs_diropwait = 0; 414 fs->lfs_activesb = 0; 415 #ifdef LFS_CANNOT_ROLLFW 416 fs->lfs_sbactive = NULL; 417 #endif 418 #ifdef LFS_TRACK_IOS 419 for (i=0;i<LFS_THROTTLE;i++) 420 fs->lfs_pending[i] = LFS_UNUSED_DADDR; 421 #endif 422 423 /* Set up the ifile and lock aflags */ 424 fs->lfs_doifile = 0; 425 fs->lfs_writer = 0; 426 fs->lfs_dirops = 0; 427 fs->lfs_seglock = 0; 428 lockinit(&fs->lfs_freelock, PINOD, "lfs_freelock", 0, 0); 429 430 /* Set the file system readonly/modify bits. */ 431 fs->lfs_ronly = ronly; 432 if (ronly == 0) 433 fs->lfs_fmod = 1; 434 435 /* Initialize the mount structure. */ 436 dev = devvp->v_rdev; 437 mp->mnt_data = (qaddr_t)ump; 438 mp->mnt_stat.f_fsid.val[0] = (long)dev; 439 mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_LFS); 440 mp->mnt_maxsymlinklen = fs->lfs_maxsymlinklen; 441 mp->mnt_flag |= MNT_LOCAL; 442 ump->um_flags = 0; 443 ump->um_mountp = mp; 444 ump->um_dev = dev; 445 ump->um_devvp = devvp; 446 ump->um_bptrtodb = 0; 447 ump->um_seqinc = 1 << fs->lfs_fsbtodb; 448 ump->um_nindir = fs->lfs_nindir; 449 for (i = 0; i < MAXQUOTAS; i++) 450 ump->um_quotas[i] = NULLVP; 451 devvp->v_specmountpoint = mp; 452 453 /* 454 * We use the ifile vnode for almost every operation. Instead of 455 * retrieving it from the hash table each time we retrieve it here, 456 * artificially increment the reference count and keep a pointer 457 * to it in the incore copy of the superblock. 458 */ 459 if ((error = VFS_VGET(mp, LFS_IFILE_INUM, &vp)) != 0) 460 goto out; 461 fs->lfs_ivnode = vp; 462 VREF(vp); 463 vput(vp); 464 465 /* 466 * Mark the current segment as ACTIVE, since we're going to 467 * be writing to it. 468 */ 469 LFS_SEGENTRY(sup, fs, datosn(fs, fs->lfs_offset), bp); 470 sup->su_flags |= SEGUSE_DIRTY | SEGUSE_ACTIVE; 471 (void) VOP_BWRITE(bp); 472 473 return (0); 474 out: 475 if (bp) 476 brelse(bp); 477 if (abp) 478 brelse(abp); 479 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 480 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, cred, p); 481 VOP_UNLOCK(devvp, 0); 482 if (ump) { 483 free(ump->um_lfs, M_UFSMNT); 484 free(ump, M_UFSMNT); 485 mp->mnt_data = (qaddr_t)0; 486 } 487 return (error); 488 } 489 490 /* 491 * unmount system call 492 */ 493 int 494 lfs_unmount(mp, mntflags, p) 495 struct mount *mp; 496 int mntflags; 497 struct proc *p; 498 { 499 struct ufsmount *ump; 500 struct lfs *fs; 501 int error, flags, ronly; 502 extern int lfs_allclean_wakeup; 503 504 flags = 0; 505 if (mntflags & MNT_FORCE) 506 flags |= FORCECLOSE; 507 508 ump = VFSTOUFS(mp); 509 fs = ump->um_lfs; 510 #ifdef QUOTA 511 if (mp->mnt_flag & MNT_QUOTA) { 512 int i; 513 error = vflush(mp, fs->lfs_ivnode, SKIPSYSTEM|flags); 514 if (error) 515 return (error); 516 for (i = 0; i < MAXQUOTAS; i++) { 517 if (ump->um_quotas[i] == NULLVP) 518 continue; 519 quotaoff(p, mp, i); 520 } 521 /* 522 * Here we fall through to vflush again to ensure 523 * that we have gotten rid of all the system vnodes. 524 */ 525 } 526 #endif 527 if ((error = vflush(mp, fs->lfs_ivnode, flags)) != 0) 528 return (error); 529 fs->lfs_clean = 1; 530 if ((error = VFS_SYNC(mp, 1, p->p_ucred, p)) != 0) 531 return (error); 532 if (fs->lfs_ivnode->v_dirtyblkhd.lh_first) 533 panic("lfs_unmount: still dirty blocks on ifile vnode\n"); 534 vrele(fs->lfs_ivnode); 535 vgone(fs->lfs_ivnode); 536 537 ronly = !fs->lfs_ronly; 538 if (ump->um_devvp->v_type != VBAD) 539 ump->um_devvp->v_specmountpoint = NULL; 540 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 541 error = VOP_CLOSE(ump->um_devvp, 542 ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 543 vput(ump->um_devvp); 544 545 /* XXX KS - wake up the cleaner so it can die */ 546 wakeup(&fs->lfs_nextseg); 547 wakeup(&lfs_allclean_wakeup); 548 549 free(fs, M_UFSMNT); 550 free(ump, M_UFSMNT); 551 mp->mnt_data = (qaddr_t)0; 552 mp->mnt_flag &= ~MNT_LOCAL; 553 return (error); 554 } 555 556 /* 557 * Get file system statistics. 558 */ 559 int 560 lfs_statfs(mp, sbp, p) 561 struct mount *mp; 562 struct statfs *sbp; 563 struct proc *p; 564 { 565 struct lfs *fs; 566 struct ufsmount *ump; 567 568 ump = VFSTOUFS(mp); 569 fs = ump->um_lfs; 570 if (fs->lfs_magic != LFS_MAGIC) 571 panic("lfs_statfs: magic"); 572 sbp->f_type = 0; 573 sbp->f_bsize = fs->lfs_fsize; 574 sbp->f_iosize = fs->lfs_bsize; 575 sbp->f_blocks = dbtofrags(fs, fs->lfs_dsize); 576 sbp->f_bfree = dbtofrags(fs, fs->lfs_bfree); 577 /* 578 * To compute the available space. Subtract the minimum free 579 * from the total number of blocks in the file system. Set avail 580 * to the smaller of this number and fs->lfs_bfree. 581 * 582 * XXX KS - is my modification below what is desired? (This 583 * will, e.g., change the report when the cleaner runs.) 584 */ 585 #if 0 586 sbp->f_bavail = (long) ((u_int64_t) fs->lfs_dsize * (u_int64_t) 587 (100 - fs->lfs_minfree) / (u_int64_t) 100); 588 sbp->f_bavail = 589 sbp->f_bavail > fs->lfs_bfree ? fs->lfs_bfree : sbp->f_bavail; 590 #else 591 sbp->f_bavail = (long) ((u_int64_t) fs->lfs_dsize * (u_int64_t) 592 (100 - fs->lfs_minfree) / (u_int64_t) 100) 593 - (u_int64_t)(fs->lfs_dsize - fs->lfs_bfree); 594 #endif 595 sbp->f_bavail = dbtofrags(fs, sbp->f_bavail); 596 sbp->f_files = dbtofsb(fs,fs->lfs_bfree) * INOPB(fs); 597 sbp->f_ffree = sbp->f_files - fs->lfs_nfiles; 598 if (sbp != &mp->mnt_stat) { 599 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 600 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 601 } 602 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 603 return (0); 604 } 605 606 /* 607 * Go through the disk queues to initiate sandbagged IO; 608 * go through the inodes to write those that have been modified; 609 * initiate the writing of the super block if it has been modified. 610 * 611 * Note: we are always called with the filesystem marked `MPBUSY'. 612 */ 613 int 614 lfs_sync(mp, waitfor, cred, p) 615 struct mount *mp; 616 int waitfor; 617 struct ucred *cred; 618 struct proc *p; 619 { 620 int error; 621 struct lfs *fs; 622 623 fs = ((struct ufsmount *)mp->mnt_data)->ufsmount_u.lfs; 624 while(fs->lfs_dirops) 625 error = tsleep(&fs->lfs_dirops, PRIBIO + 1, "lfs_dirops", 0); 626 fs->lfs_writer++; 627 628 /* All syncs must be checkpoints until roll-forward is implemented. */ 629 error = lfs_segwrite(mp, SEGM_CKP | (waitfor ? SEGM_SYNC : 0)); 630 if(--fs->lfs_writer==0) 631 wakeup(&fs->lfs_dirops); 632 #ifdef QUOTA 633 qsync(mp); 634 #endif 635 return (error); 636 } 637 638 extern struct lock ufs_hashlock; 639 640 /* 641 * Look up an LFS dinode number to find its incore vnode. If not already 642 * in core, read it in from the specified device. Return the inode locked. 643 * Detection and handling of mount points must be done by the calling routine. 644 */ 645 int 646 lfs_vget(mp, ino, vpp) 647 struct mount *mp; 648 ino_t ino; 649 struct vnode **vpp; 650 { 651 struct lfs *fs; 652 struct inode *ip; 653 struct buf *bp; 654 struct ifile *ifp; 655 struct vnode *vp; 656 struct ufsmount *ump; 657 ufs_daddr_t daddr; 658 dev_t dev; 659 int error; 660 #ifdef LFS_ATIME_IFILE 661 struct timespec ts; 662 #endif 663 664 ump = VFSTOUFS(mp); 665 dev = ump->um_dev; 666 667 do { 668 if ((*vpp = ufs_ihashget(dev, ino, LK_EXCLUSIVE)) != NULL) 669 return (0); 670 } while (lockmgr(&ufs_hashlock, LK_EXCLUSIVE|LK_SLEEPFAIL, 0)); 671 672 /* Translate the inode number to a disk address. */ 673 fs = ump->um_lfs; 674 if (ino == LFS_IFILE_INUM) 675 daddr = fs->lfs_idaddr; 676 else { 677 LFS_IENTRY(ifp, fs, ino, bp); 678 daddr = ifp->if_daddr; 679 #ifdef LFS_ATIME_IFILE 680 ts = ifp->if_atime; /* structure copy */ 681 #endif 682 brelse(bp); 683 if (daddr == LFS_UNUSED_DADDR) { 684 lockmgr(&ufs_hashlock, LK_RELEASE, 0); 685 return (ENOENT); 686 } 687 } 688 689 /* Allocate new vnode/inode. */ 690 if ((error = lfs_vcreate(mp, ino, &vp)) != 0) { 691 *vpp = NULL; 692 lockmgr(&ufs_hashlock, LK_RELEASE, 0); 693 return (error); 694 } 695 696 /* 697 * Put it onto its hash chain and lock it so that other requests for 698 * this inode will block if they arrive while we are sleeping waiting 699 * for old data structures to be purged or for the contents of the 700 * disk portion of this inode to be read. 701 */ 702 ip = VTOI(vp); 703 ufs_ihashins(ip); 704 lockmgr(&ufs_hashlock, LK_RELEASE, 0); 705 706 /* 707 * XXX 708 * This may not need to be here, logically it should go down with 709 * the i_devvp initialization. 710 * Ask Kirk. 711 */ 712 ip->i_lfs = ump->um_lfs; 713 714 /* Read in the disk contents for the inode, copy into the inode. */ 715 error = bread(ump->um_devvp, daddr, (int)fs->lfs_bsize, NOCRED, &bp); 716 if (error) { 717 /* 718 * The inode does not contain anything useful, so it would 719 * be misleading to leave it on its hash chain. With mode 720 * still zero, it will be unlinked and returned to the free 721 * list by vput(). 722 */ 723 vput(vp); 724 brelse(bp); 725 *vpp = NULL; 726 return (error); 727 } 728 ip->i_din.ffs_din = *lfs_ifind(fs, ino, bp); 729 ip->i_ffs_effnlink = ip->i_ffs_nlink; 730 #ifdef LFS_ATIME_IFILE 731 ip->i_ffs_atime = ts.tv_sec; 732 ip->i_ffs_atimensec = ts.tv_nsec; 733 #endif 734 brelse(bp); 735 736 /* 737 * Initialize the vnode from the inode, check for aliases. In all 738 * cases re-init ip, the underlying vnode/inode may have changed. 739 */ 740 error = ufs_vinit(mp, lfs_specop_p, lfs_fifoop_p, &vp); 741 if (error) { 742 vput(vp); 743 *vpp = NULL; 744 return (error); 745 } 746 if(vp->v_type == VNON) { 747 printf("lfs_vget: ino %d is type VNON! (ifmt %o)\n", ip->i_number, (ip->i_ffs_mode&IFMT)>>12); 748 #ifdef DDB 749 Debugger(); 750 #endif 751 } 752 /* 753 * Finish inode initialization now that aliasing has been resolved. 754 */ 755 ip->i_devvp = ump->um_devvp; 756 VREF(ip->i_devvp); 757 *vpp = vp; 758 759 return (0); 760 } 761 762 /* 763 * File handle to vnode 764 * 765 * Have to be really careful about stale file handles: 766 * - check that the inode number is valid 767 * - call lfs_vget() to get the locked inode 768 * - check for an unallocated inode (i_mode == 0) 769 * 770 * XXX 771 * use ifile to see if inode is allocated instead of reading off disk 772 * what is the relationship between my generational number and the NFS 773 * generational number. 774 */ 775 int 776 lfs_fhtovp(mp, fhp, vpp) 777 struct mount *mp; 778 struct fid *fhp; 779 struct vnode **vpp; 780 { 781 struct ufid *ufhp; 782 783 ufhp = (struct ufid *)fhp; 784 if (ufhp->ufid_ino < ROOTINO) 785 return (ESTALE); 786 return (ufs_fhtovp(mp, ufhp, vpp)); 787 } 788 789 /* 790 * Vnode pointer to File handle 791 */ 792 /* ARGSUSED */ 793 int 794 lfs_vptofh(vp, fhp) 795 struct vnode *vp; 796 struct fid *fhp; 797 { 798 struct inode *ip; 799 struct ufid *ufhp; 800 801 ip = VTOI(vp); 802 ufhp = (struct ufid *)fhp; 803 ufhp->ufid_len = sizeof(struct ufid); 804 ufhp->ufid_ino = ip->i_number; 805 ufhp->ufid_gen = ip->i_ffs_gen; 806 return (0); 807 } 808 809 int 810 lfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 811 int *name; 812 u_int namelen; 813 void *oldp; 814 size_t *oldlenp; 815 void *newp; 816 size_t newlen; 817 struct proc *p; 818 { 819 extern int lfs_writeindir, lfs_dostats, lfs_clean_vnhead; 820 extern struct lfs_stats lfs_stats; 821 int error; 822 823 /* all sysctl names at this level are terminal */ 824 if (namelen != 1) 825 return (ENOTDIR); 826 827 switch (name[0]) { 828 case LFS_WRITEINDIR: 829 return (sysctl_int(oldp, oldlenp, newp, newlen, 830 &lfs_writeindir)); 831 case LFS_CLEAN_VNHEAD: 832 return (sysctl_int(oldp, oldlenp, newp, newlen, 833 &lfs_clean_vnhead)); 834 case LFS_DOSTATS: 835 if((error = sysctl_int(oldp, oldlenp, newp, newlen, 836 &lfs_dostats))) 837 return error; 838 if(lfs_dostats == 0) 839 memset(&lfs_stats,0,sizeof(lfs_stats)); 840 return 0; 841 case LFS_STATS: 842 return (sysctl_rdstruct(oldp, oldlenp, newp, 843 &lfs_stats, sizeof(lfs_stats))); 844 default: 845 return (EOPNOTSUPP); 846 } 847 /* NOTREACHED */ 848 } 849
Indexes created Mon Sep 29 21:09:56 GMT 2025