lfs_vfsops.c revision 1.58
1 /* $NetBSD: lfs_vfsops.c,v 1.58 2000/09/09 04:49:55 perseant Exp $ */ 2 3 /*- 4 * Copyright (c) 1999, 2000 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 <uvm/uvm_extern.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 abp = NULL; 370 ump = NULL; 371 372 /* Read in the superblock. */ 373 error = bread(devvp, LFS_LABELPAD / size, LFS_SBPAD, cred, &bp); 374 if (error) 375 goto out; 376 dfs = (struct dlfs *)bp->b_data; 377 378 /* Check the basics. */ 379 if (dfs->dlfs_magic != LFS_MAGIC || dfs->dlfs_bsize > MAXBSIZE || 380 dfs->dlfs_version > LFS_VERSION || 381 dfs->dlfs_bsize < sizeof(struct dlfs)) { 382 error = EINVAL; /* XXX needs translation */ 383 goto out; 384 } 385 386 /* 387 * Check the second superblock to see which is newer; then mount 388 * using the older of the two. This is necessary to ensure that 389 * the filesystem is valid if it was not unmounted cleanly. 390 */ 391 if (dfs->dlfs_sboffs[1] && 392 dfs->dlfs_sboffs[1]-(LFS_LABELPAD/size) > LFS_SBPAD/size) 393 { 394 error = bread(devvp, dfs->dlfs_sboffs[1], LFS_SBPAD, cred, &abp); 395 if (error) 396 goto out; 397 adfs = (struct dlfs *)abp->b_data; 398 399 if (adfs->dlfs_tstamp < dfs->dlfs_tstamp) /* XXX 1s? */ 400 dfs = adfs; 401 } else { 402 printf("lfs_mountfs: invalid alt superblock daddr=0x%x\n", 403 dfs->dlfs_sboffs[1]); 404 error = EINVAL; 405 goto out; 406 } 407 408 /* Allocate the mount structure, copy the superblock into it. */ 409 fs = malloc(sizeof(struct lfs), M_UFSMNT, M_WAITOK); 410 memcpy(&fs->lfs_dlfs, dfs, sizeof(struct dlfs)); 411 ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK); 412 memset((caddr_t)ump, 0, sizeof *ump); 413 ump->um_lfs = fs; 414 if (sizeof(struct lfs) < LFS_SBPAD) /* XXX why? */ 415 bp->b_flags |= B_INVAL; 416 brelse(bp); 417 bp = NULL; 418 brelse(abp); 419 abp = NULL; 420 421 /* Set up the I/O information */ 422 fs->lfs_iocount = 0; 423 fs->lfs_diropwait = 0; 424 fs->lfs_activesb = 0; 425 fs->lfs_uinodes = 0; 426 fs->lfs_ravail = 0; 427 #ifdef LFS_CANNOT_ROLLFW 428 fs->lfs_sbactive = 0; 429 #endif 430 #ifdef LFS_TRACK_IOS 431 for (i=0;i<LFS_THROTTLE;i++) 432 fs->lfs_pending[i] = LFS_UNUSED_DADDR; 433 #endif 434 435 /* Set up the ifile and lock aflags */ 436 fs->lfs_doifile = 0; 437 fs->lfs_writer = 0; 438 fs->lfs_dirops = 0; 439 fs->lfs_nadirop = 0; 440 fs->lfs_seglock = 0; 441 lockinit(&fs->lfs_freelock, PINOD, "lfs_freelock", 0, 0); 442 443 /* Set the file system readonly/modify bits. */ 444 fs->lfs_ronly = ronly; 445 if (ronly == 0) 446 fs->lfs_fmod = 1; 447 448 /* Initialize the mount structure. */ 449 dev = devvp->v_rdev; 450 mp->mnt_data = (qaddr_t)ump; 451 mp->mnt_stat.f_fsid.val[0] = (long)dev; 452 mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_LFS); 453 mp->mnt_stat.f_iosize = fs->lfs_bsize; 454 mp->mnt_maxsymlinklen = fs->lfs_maxsymlinklen; 455 mp->mnt_flag |= MNT_LOCAL; 456 ump->um_flags = 0; 457 ump->um_mountp = mp; 458 ump->um_dev = dev; 459 ump->um_devvp = devvp; 460 ump->um_bptrtodb = 0; 461 ump->um_seqinc = 1 << fs->lfs_fsbtodb; 462 ump->um_nindir = fs->lfs_nindir; 463 for (i = 0; i < MAXQUOTAS; i++) 464 ump->um_quotas[i] = NULLVP; 465 devvp->v_specmountpoint = mp; 466 467 /* 468 * We use the ifile vnode for almost every operation. Instead of 469 * retrieving it from the hash table each time we retrieve it here, 470 * artificially increment the reference count and keep a pointer 471 * to it in the incore copy of the superblock. 472 */ 473 if ((error = VFS_VGET(mp, LFS_IFILE_INUM, &vp)) != 0) 474 goto out; 475 fs->lfs_ivnode = vp; 476 VREF(vp); 477 vput(vp); 478 479 /* 480 * Mark the current segment as ACTIVE, since we're going to 481 * be writing to it. 482 */ 483 LFS_SEGENTRY(sup, fs, datosn(fs, fs->lfs_offset), bp); 484 sup->su_flags |= SEGUSE_DIRTY | SEGUSE_ACTIVE; 485 (void) VOP_BWRITE(bp); 486 487 return (0); 488 out: 489 if (bp) 490 brelse(bp); 491 if (abp) 492 brelse(abp); 493 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 494 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, cred, p); 495 VOP_UNLOCK(devvp, 0); 496 if (ump) { 497 free(ump->um_lfs, M_UFSMNT); 498 free(ump, M_UFSMNT); 499 mp->mnt_data = (qaddr_t)0; 500 } 501 return (error); 502 } 503 504 /* 505 * unmount system call 506 */ 507 int 508 lfs_unmount(mp, mntflags, p) 509 struct mount *mp; 510 int mntflags; 511 struct proc *p; 512 { 513 struct ufsmount *ump; 514 struct lfs *fs; 515 int error, flags, ronly; 516 extern int lfs_allclean_wakeup; 517 518 flags = 0; 519 if (mntflags & MNT_FORCE) 520 flags |= FORCECLOSE; 521 522 ump = VFSTOUFS(mp); 523 fs = ump->um_lfs; 524 #ifdef QUOTA 525 if (mp->mnt_flag & MNT_QUOTA) { 526 int i; 527 error = vflush(mp, fs->lfs_ivnode, SKIPSYSTEM|flags); 528 if (error) 529 return (error); 530 for (i = 0; i < MAXQUOTAS; i++) { 531 if (ump->um_quotas[i] == NULLVP) 532 continue; 533 quotaoff(p, mp, i); 534 } 535 /* 536 * Here we fall through to vflush again to ensure 537 * that we have gotten rid of all the system vnodes. 538 */ 539 } 540 #endif 541 if ((error = vflush(mp, fs->lfs_ivnode, flags)) != 0) 542 return (error); 543 fs->lfs_clean = 1; 544 if ((error = VFS_SYNC(mp, 1, p->p_ucred, p)) != 0) 545 return (error); 546 if (fs->lfs_ivnode->v_dirtyblkhd.lh_first) 547 panic("lfs_unmount: still dirty blocks on ifile vnode\n"); 548 vrele(fs->lfs_ivnode); 549 vgone(fs->lfs_ivnode); 550 551 ronly = !fs->lfs_ronly; 552 if (ump->um_devvp->v_type != VBAD) 553 ump->um_devvp->v_specmountpoint = NULL; 554 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 555 error = VOP_CLOSE(ump->um_devvp, 556 ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 557 vput(ump->um_devvp); 558 559 /* XXX KS - wake up the cleaner so it can die */ 560 wakeup(&fs->lfs_nextseg); 561 wakeup(&lfs_allclean_wakeup); 562 563 free(fs, M_UFSMNT); 564 free(ump, M_UFSMNT); 565 mp->mnt_data = (qaddr_t)0; 566 mp->mnt_flag &= ~MNT_LOCAL; 567 return (error); 568 } 569 570 /* 571 * Get file system statistics. 572 */ 573 int 574 lfs_statfs(mp, sbp, p) 575 struct mount *mp; 576 struct statfs *sbp; 577 struct proc *p; 578 { 579 struct lfs *fs; 580 struct ufsmount *ump; 581 582 ump = VFSTOUFS(mp); 583 fs = ump->um_lfs; 584 if (fs->lfs_magic != LFS_MAGIC) 585 panic("lfs_statfs: magic"); 586 587 sbp->f_type = 0; 588 sbp->f_bsize = fs->lfs_fsize; 589 sbp->f_iosize = fs->lfs_bsize; 590 sbp->f_blocks = dbtofrags(fs, LFS_EST_NONMETA(fs)); 591 sbp->f_bfree = dbtofrags(fs, LFS_EST_BFREE(fs)); 592 sbp->f_bavail = dbtofrags(fs, (long)LFS_EST_BFREE(fs) - 593 (long)LFS_EST_RSVD(fs)); 594 sbp->f_files = dbtofsb(fs,fs->lfs_bfree) * INOPB(fs); 595 sbp->f_ffree = sbp->f_files - fs->lfs_nfiles; 596 if (sbp != &mp->mnt_stat) { 597 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 598 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 599 } 600 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 601 return (0); 602 } 603 604 /* 605 * Go through the disk queues to initiate sandbagged IO; 606 * go through the inodes to write those that have been modified; 607 * initiate the writing of the super block if it has been modified. 608 * 609 * Note: we are always called with the filesystem marked `MPBUSY'. 610 */ 611 int 612 lfs_sync(mp, waitfor, cred, p) 613 struct mount *mp; 614 int waitfor; 615 struct ucred *cred; 616 struct proc *p; 617 { 618 int error; 619 struct lfs *fs; 620 621 fs = ((struct ufsmount *)mp->mnt_data)->ufsmount_u.lfs; 622 if (fs->lfs_ronly) 623 return 0; 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 if ((*vpp = ufs_ihashget(dev, ino, LK_EXCLUSIVE)) != NULL) 668 return (0); 669 670 if ((error = getnewvnode(VT_LFS, mp, lfs_vnodeop_p, &vp)) != 0) { 671 *vpp = NULL; 672 return (error); 673 } 674 675 do { 676 if ((*vpp = ufs_ihashget(dev, ino, LK_EXCLUSIVE)) != NULL) { 677 ungetnewvnode(vp); 678 return (0); 679 } 680 } while (lockmgr(&ufs_hashlock, LK_EXCLUSIVE|LK_SLEEPFAIL, 0)); 681 682 /* Translate the inode number to a disk address. */ 683 fs = ump->um_lfs; 684 if (ino == LFS_IFILE_INUM) 685 daddr = fs->lfs_idaddr; 686 else { 687 LFS_IENTRY(ifp, fs, ino, bp); 688 daddr = ifp->if_daddr; 689 #ifdef LFS_ATIME_IFILE 690 ts = ifp->if_atime; /* structure copy */ 691 #endif 692 brelse(bp); 693 if (daddr == LFS_UNUSED_DADDR) { 694 lockmgr(&ufs_hashlock, LK_RELEASE, 0); 695 return (ENOENT); 696 } 697 } 698 699 /* Allocate/init new vnode/inode. */ 700 lfs_vcreate(mp, ino, vp); 701 702 /* 703 * Put it onto its hash chain and lock it so that other requests for 704 * this inode will block if they arrive while we are sleeping waiting 705 * for old data structures to be purged or for the contents of the 706 * disk portion of this inode to be read. 707 */ 708 ip = VTOI(vp); 709 ufs_ihashins(ip); 710 lockmgr(&ufs_hashlock, LK_RELEASE, 0); 711 712 /* 713 * XXX 714 * This may not need to be here, logically it should go down with 715 * the i_devvp initialization. 716 * Ask Kirk. 717 */ 718 ip->i_lfs = ump->um_lfs; 719 720 /* Read in the disk contents for the inode, copy into the inode. */ 721 error = bread(ump->um_devvp, daddr, (int)fs->lfs_bsize, NOCRED, &bp); 722 if (error) { 723 /* 724 * The inode does not contain anything useful, so it would 725 * be misleading to leave it on its hash chain. With mode 726 * still zero, it will be unlinked and returned to the free 727 * list by vput(). 728 */ 729 vput(vp); 730 brelse(bp); 731 *vpp = NULL; 732 return (error); 733 } 734 ip->i_din.ffs_din = *lfs_ifind(fs, ino, bp); 735 ip->i_ffs_effnlink = ip->i_ffs_nlink; 736 ip->i_lfs_effnblks = ip->i_ffs_blocks; 737 #ifdef LFS_ATIME_IFILE 738 ip->i_ffs_atime = ts.tv_sec; 739 ip->i_ffs_atimensec = ts.tv_nsec; 740 #endif 741 brelse(bp); 742 743 /* 744 * Initialize the vnode from the inode, check for aliases. In all 745 * cases re-init ip, the underlying vnode/inode may have changed. 746 */ 747 error = ufs_vinit(mp, lfs_specop_p, lfs_fifoop_p, &vp); 748 if (error) { 749 vput(vp); 750 *vpp = NULL; 751 return (error); 752 } 753 #ifdef DIAGNOSTIC 754 if(vp->v_type == VNON) { 755 panic("lfs_vget: ino %d is type VNON! (ifmt %o)\n", 756 ip->i_number, (ip->i_ffs_mode & IFMT) >> 12); 757 } 758 #endif 759 /* 760 * Finish inode initialization now that aliasing has been resolved. 761 */ 762 ip->i_devvp = ump->um_devvp; 763 VREF(ip->i_devvp); 764 *vpp = vp; 765 766 return (0); 767 } 768 769 /* 770 * File handle to vnode 771 * 772 * Have to be really careful about stale file handles: 773 * - check that the inode number is valid 774 * - call lfs_vget() to get the locked inode 775 * - check for an unallocated inode (i_mode == 0) 776 * 777 * XXX 778 * use ifile to see if inode is allocated instead of reading off disk 779 * what is the relationship between my generational number and the NFS 780 * generational number. 781 */ 782 int 783 lfs_fhtovp(mp, fhp, vpp) 784 struct mount *mp; 785 struct fid *fhp; 786 struct vnode **vpp; 787 { 788 struct ufid *ufhp; 789 790 ufhp = (struct ufid *)fhp; 791 if (ufhp->ufid_ino < ROOTINO) 792 return (ESTALE); 793 return (ufs_fhtovp(mp, ufhp, vpp)); 794 } 795 796 /* 797 * Vnode pointer to File handle 798 */ 799 /* ARGSUSED */ 800 int 801 lfs_vptofh(vp, fhp) 802 struct vnode *vp; 803 struct fid *fhp; 804 { 805 struct inode *ip; 806 struct ufid *ufhp; 807 808 ip = VTOI(vp); 809 ufhp = (struct ufid *)fhp; 810 ufhp->ufid_len = sizeof(struct ufid); 811 ufhp->ufid_ino = ip->i_number; 812 ufhp->ufid_gen = ip->i_ffs_gen; 813 return (0); 814 } 815 816 int 817 lfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 818 int *name; 819 u_int namelen; 820 void *oldp; 821 size_t *oldlenp; 822 void *newp; 823 size_t newlen; 824 struct proc *p; 825 { 826 extern int lfs_writeindir, lfs_dostats, lfs_clean_vnhead; 827 extern struct lfs_stats lfs_stats; 828 int error; 829 830 /* all sysctl names at this level are terminal */ 831 if (namelen != 1) 832 return (ENOTDIR); 833 834 switch (name[0]) { 835 case LFS_WRITEINDIR: 836 return (sysctl_int(oldp, oldlenp, newp, newlen, 837 &lfs_writeindir)); 838 case LFS_CLEAN_VNHEAD: 839 return (sysctl_int(oldp, oldlenp, newp, newlen, 840 &lfs_clean_vnhead)); 841 case LFS_DOSTATS: 842 if((error = sysctl_int(oldp, oldlenp, newp, newlen, 843 &lfs_dostats))) 844 return error; 845 if(lfs_dostats == 0) 846 memset(&lfs_stats,0,sizeof(lfs_stats)); 847 return 0; 848 case LFS_STATS: 849 return (sysctl_rdstruct(oldp, oldlenp, newp, 850 &lfs_stats, sizeof(lfs_stats))); 851 default: 852 return (EOPNOTSUPP); 853 } 854 /* NOTREACHED */ 855 } 856
Indexes created Mon Sep 29 21:09:56 GMT 2025