lfs_vfsops.c revision 1.54
1 /* $NetBSD: lfs_vfsops.c,v 1.54 2000/06/28 14:11:35 mrg 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 <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 #ifdef LFS_CANNOT_ROLLFW 426 fs->lfs_sbactive = 0; 427 #endif 428 #ifdef LFS_TRACK_IOS 429 for (i=0;i<LFS_THROTTLE;i++) 430 fs->lfs_pending[i] = LFS_UNUSED_DADDR; 431 #endif 432 433 /* Set up the ifile and lock aflags */ 434 fs->lfs_doifile = 0; 435 fs->lfs_writer = 0; 436 fs->lfs_dirops = 0; 437 fs->lfs_nadirop = 0; 438 fs->lfs_seglock = 0; 439 lockinit(&fs->lfs_freelock, PINOD, "lfs_freelock", 0, 0); 440 441 /* Set the file system readonly/modify bits. */ 442 fs->lfs_ronly = ronly; 443 if (ronly == 0) 444 fs->lfs_fmod = 1; 445 446 /* Initialize the mount structure. */ 447 dev = devvp->v_rdev; 448 mp->mnt_data = (qaddr_t)ump; 449 mp->mnt_stat.f_fsid.val[0] = (long)dev; 450 mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_LFS); 451 mp->mnt_stat.f_iosize = fs->lfs_bsize; 452 mp->mnt_maxsymlinklen = fs->lfs_maxsymlinklen; 453 mp->mnt_flag |= MNT_LOCAL; 454 ump->um_flags = 0; 455 ump->um_mountp = mp; 456 ump->um_dev = dev; 457 ump->um_devvp = devvp; 458 ump->um_bptrtodb = 0; 459 ump->um_seqinc = 1 << fs->lfs_fsbtodb; 460 ump->um_nindir = fs->lfs_nindir; 461 for (i = 0; i < MAXQUOTAS; i++) 462 ump->um_quotas[i] = NULLVP; 463 devvp->v_specmountpoint = mp; 464 465 /* 466 * We use the ifile vnode for almost every operation. Instead of 467 * retrieving it from the hash table each time we retrieve it here, 468 * artificially increment the reference count and keep a pointer 469 * to it in the incore copy of the superblock. 470 */ 471 if ((error = VFS_VGET(mp, LFS_IFILE_INUM, &vp)) != 0) 472 goto out; 473 fs->lfs_ivnode = vp; 474 VREF(vp); 475 vput(vp); 476 477 /* 478 * Mark the current segment as ACTIVE, since we're going to 479 * be writing to it. 480 */ 481 LFS_SEGENTRY(sup, fs, datosn(fs, fs->lfs_offset), bp); 482 sup->su_flags |= SEGUSE_DIRTY | SEGUSE_ACTIVE; 483 (void) VOP_BWRITE(bp); 484 485 return (0); 486 out: 487 if (bp) 488 brelse(bp); 489 if (abp) 490 brelse(abp); 491 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 492 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, cred, p); 493 VOP_UNLOCK(devvp, 0); 494 if (ump) { 495 free(ump->um_lfs, M_UFSMNT); 496 free(ump, M_UFSMNT); 497 mp->mnt_data = (qaddr_t)0; 498 } 499 return (error); 500 } 501 502 /* 503 * unmount system call 504 */ 505 int 506 lfs_unmount(mp, mntflags, p) 507 struct mount *mp; 508 int mntflags; 509 struct proc *p; 510 { 511 struct ufsmount *ump; 512 struct lfs *fs; 513 int error, flags, ronly; 514 extern int lfs_allclean_wakeup; 515 516 flags = 0; 517 if (mntflags & MNT_FORCE) 518 flags |= FORCECLOSE; 519 520 ump = VFSTOUFS(mp); 521 fs = ump->um_lfs; 522 #ifdef QUOTA 523 if (mp->mnt_flag & MNT_QUOTA) { 524 int i; 525 error = vflush(mp, fs->lfs_ivnode, SKIPSYSTEM|flags); 526 if (error) 527 return (error); 528 for (i = 0; i < MAXQUOTAS; i++) { 529 if (ump->um_quotas[i] == NULLVP) 530 continue; 531 quotaoff(p, mp, i); 532 } 533 /* 534 * Here we fall through to vflush again to ensure 535 * that we have gotten rid of all the system vnodes. 536 */ 537 } 538 #endif 539 if ((error = vflush(mp, fs->lfs_ivnode, flags)) != 0) 540 return (error); 541 fs->lfs_clean = 1; 542 if ((error = VFS_SYNC(mp, 1, p->p_ucred, p)) != 0) 543 return (error); 544 if (fs->lfs_ivnode->v_dirtyblkhd.lh_first) 545 panic("lfs_unmount: still dirty blocks on ifile vnode\n"); 546 vrele(fs->lfs_ivnode); 547 vgone(fs->lfs_ivnode); 548 549 ronly = !fs->lfs_ronly; 550 if (ump->um_devvp->v_type != VBAD) 551 ump->um_devvp->v_specmountpoint = NULL; 552 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 553 error = VOP_CLOSE(ump->um_devvp, 554 ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 555 vput(ump->um_devvp); 556 557 /* XXX KS - wake up the cleaner so it can die */ 558 wakeup(&fs->lfs_nextseg); 559 wakeup(&lfs_allclean_wakeup); 560 561 free(fs, M_UFSMNT); 562 free(ump, M_UFSMNT); 563 mp->mnt_data = (qaddr_t)0; 564 mp->mnt_flag &= ~MNT_LOCAL; 565 return (error); 566 } 567 568 /* 569 * Get file system statistics. 570 */ 571 int 572 lfs_statfs(mp, sbp, p) 573 struct mount *mp; 574 struct statfs *sbp; 575 struct proc *p; 576 { 577 struct lfs *fs; 578 struct ufsmount *ump; 579 580 ump = VFSTOUFS(mp); 581 fs = ump->um_lfs; 582 if (fs->lfs_magic != LFS_MAGIC) 583 panic("lfs_statfs: magic"); 584 585 sbp->f_type = 0; 586 sbp->f_bsize = fs->lfs_fsize; 587 sbp->f_iosize = fs->lfs_bsize; 588 sbp->f_blocks = dbtofrags(fs, LFS_EST_NONMETA(fs)); 589 sbp->f_bfree = dbtofrags(fs, LFS_EST_BFREE(fs)); 590 sbp->f_bavail = dbtofrags(fs, (long)LFS_EST_BFREE(fs) - 591 (long)LFS_EST_RSVD(fs)); 592 sbp->f_files = dbtofsb(fs,fs->lfs_bfree) * INOPB(fs); 593 sbp->f_ffree = sbp->f_files - fs->lfs_nfiles; 594 if (sbp != &mp->mnt_stat) { 595 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 596 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 597 } 598 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 599 return (0); 600 } 601 602 /* 603 * Go through the disk queues to initiate sandbagged IO; 604 * go through the inodes to write those that have been modified; 605 * initiate the writing of the super block if it has been modified. 606 * 607 * Note: we are always called with the filesystem marked `MPBUSY'. 608 */ 609 int 610 lfs_sync(mp, waitfor, cred, p) 611 struct mount *mp; 612 int waitfor; 613 struct ucred *cred; 614 struct proc *p; 615 { 616 int error; 617 struct lfs *fs; 618 619 fs = ((struct ufsmount *)mp->mnt_data)->ufsmount_u.lfs; 620 while(fs->lfs_dirops) 621 error = tsleep(&fs->lfs_dirops, PRIBIO + 1, "lfs_dirops", 0); 622 fs->lfs_writer++; 623 624 /* All syncs must be checkpoints until roll-forward is implemented. */ 625 error = lfs_segwrite(mp, SEGM_CKP | (waitfor ? SEGM_SYNC : 0)); 626 if(--fs->lfs_writer==0) 627 wakeup(&fs->lfs_dirops); 628 #ifdef QUOTA 629 qsync(mp); 630 #endif 631 return (error); 632 } 633 634 extern struct lock ufs_hashlock; 635 636 /* 637 * Look up an LFS dinode number to find its incore vnode. If not already 638 * in core, read it in from the specified device. Return the inode locked. 639 * Detection and handling of mount points must be done by the calling routine. 640 */ 641 int 642 lfs_vget(mp, ino, vpp) 643 struct mount *mp; 644 ino_t ino; 645 struct vnode **vpp; 646 { 647 struct lfs *fs; 648 struct inode *ip; 649 struct buf *bp; 650 struct ifile *ifp; 651 struct vnode *vp; 652 struct ufsmount *ump; 653 ufs_daddr_t daddr; 654 dev_t dev; 655 int error; 656 #ifdef LFS_ATIME_IFILE 657 struct timespec ts; 658 #endif 659 660 ump = VFSTOUFS(mp); 661 dev = ump->um_dev; 662 663 do { 664 if ((*vpp = ufs_ihashget(dev, ino, LK_EXCLUSIVE)) != NULL) 665 return (0); 666 } while (lockmgr(&ufs_hashlock, LK_EXCLUSIVE|LK_SLEEPFAIL, 0)); 667 668 /* Translate the inode number to a disk address. */ 669 fs = ump->um_lfs; 670 if (ino == LFS_IFILE_INUM) 671 daddr = fs->lfs_idaddr; 672 else { 673 LFS_IENTRY(ifp, fs, ino, bp); 674 daddr = ifp->if_daddr; 675 #ifdef LFS_ATIME_IFILE 676 ts = ifp->if_atime; /* structure copy */ 677 #endif 678 brelse(bp); 679 if (daddr == LFS_UNUSED_DADDR) { 680 lockmgr(&ufs_hashlock, LK_RELEASE, 0); 681 return (ENOENT); 682 } 683 } 684 685 /* Allocate new vnode/inode. */ 686 if ((error = lfs_vcreate(mp, ino, &vp)) != 0) { 687 *vpp = NULL; 688 lockmgr(&ufs_hashlock, LK_RELEASE, 0); 689 return (error); 690 } 691 692 /* 693 * Put it onto its hash chain and lock it so that other requests for 694 * this inode will block if they arrive while we are sleeping waiting 695 * for old data structures to be purged or for the contents of the 696 * disk portion of this inode to be read. 697 */ 698 ip = VTOI(vp); 699 ufs_ihashins(ip); 700 lockmgr(&ufs_hashlock, LK_RELEASE, 0); 701 702 /* 703 * XXX 704 * This may not need to be here, logically it should go down with 705 * the i_devvp initialization. 706 * Ask Kirk. 707 */ 708 ip->i_lfs = ump->um_lfs; 709 710 /* Read in the disk contents for the inode, copy into the inode. */ 711 error = bread(ump->um_devvp, daddr, (int)fs->lfs_bsize, NOCRED, &bp); 712 if (error) { 713 /* 714 * The inode does not contain anything useful, so it would 715 * be misleading to leave it on its hash chain. With mode 716 * still zero, it will be unlinked and returned to the free 717 * list by vput(). 718 */ 719 vput(vp); 720 brelse(bp); 721 *vpp = NULL; 722 return (error); 723 } 724 ip->i_din.ffs_din = *lfs_ifind(fs, ino, bp); 725 ip->i_ffs_effnlink = ip->i_ffs_nlink; 726 #ifdef LFS_ATIME_IFILE 727 ip->i_ffs_atime = ts.tv_sec; 728 ip->i_ffs_atimensec = ts.tv_nsec; 729 #endif 730 brelse(bp); 731 732 /* 733 * Initialize the vnode from the inode, check for aliases. In all 734 * cases re-init ip, the underlying vnode/inode may have changed. 735 */ 736 error = ufs_vinit(mp, lfs_specop_p, lfs_fifoop_p, &vp); 737 if (error) { 738 vput(vp); 739 *vpp = NULL; 740 return (error); 741 } 742 if(vp->v_type == VNON) { 743 printf("lfs_vget: ino %d is type VNON! (ifmt %o)\n", ip->i_number, (ip->i_ffs_mode&IFMT)>>12); 744 #ifdef DDB 745 Debugger(); 746 #endif 747 } 748 /* 749 * Finish inode initialization now that aliasing has been resolved. 750 */ 751 ip->i_devvp = ump->um_devvp; 752 VREF(ip->i_devvp); 753 *vpp = vp; 754 755 return (0); 756 } 757 758 /* 759 * File handle to vnode 760 * 761 * Have to be really careful about stale file handles: 762 * - check that the inode number is valid 763 * - call lfs_vget() to get the locked inode 764 * - check for an unallocated inode (i_mode == 0) 765 * 766 * XXX 767 * use ifile to see if inode is allocated instead of reading off disk 768 * what is the relationship between my generational number and the NFS 769 * generational number. 770 */ 771 int 772 lfs_fhtovp(mp, fhp, vpp) 773 struct mount *mp; 774 struct fid *fhp; 775 struct vnode **vpp; 776 { 777 struct ufid *ufhp; 778 779 ufhp = (struct ufid *)fhp; 780 if (ufhp->ufid_ino < ROOTINO) 781 return (ESTALE); 782 return (ufs_fhtovp(mp, ufhp, vpp)); 783 } 784 785 /* 786 * Vnode pointer to File handle 787 */ 788 /* ARGSUSED */ 789 int 790 lfs_vptofh(vp, fhp) 791 struct vnode *vp; 792 struct fid *fhp; 793 { 794 struct inode *ip; 795 struct ufid *ufhp; 796 797 ip = VTOI(vp); 798 ufhp = (struct ufid *)fhp; 799 ufhp->ufid_len = sizeof(struct ufid); 800 ufhp->ufid_ino = ip->i_number; 801 ufhp->ufid_gen = ip->i_ffs_gen; 802 return (0); 803 } 804 805 int 806 lfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 807 int *name; 808 u_int namelen; 809 void *oldp; 810 size_t *oldlenp; 811 void *newp; 812 size_t newlen; 813 struct proc *p; 814 { 815 extern int lfs_writeindir, lfs_dostats, lfs_clean_vnhead; 816 extern struct lfs_stats lfs_stats; 817 int error; 818 819 /* all sysctl names at this level are terminal */ 820 if (namelen != 1) 821 return (ENOTDIR); 822 823 switch (name[0]) { 824 case LFS_WRITEINDIR: 825 return (sysctl_int(oldp, oldlenp, newp, newlen, 826 &lfs_writeindir)); 827 case LFS_CLEAN_VNHEAD: 828 return (sysctl_int(oldp, oldlenp, newp, newlen, 829 &lfs_clean_vnhead)); 830 case LFS_DOSTATS: 831 if((error = sysctl_int(oldp, oldlenp, newp, newlen, 832 &lfs_dostats))) 833 return error; 834 if(lfs_dostats == 0) 835 memset(&lfs_stats,0,sizeof(lfs_stats)); 836 return 0; 837 case LFS_STATS: 838 return (sysctl_rdstruct(oldp, oldlenp, newp, 839 &lfs_stats, sizeof(lfs_stats))); 840 default: 841 return (EOPNOTSUPP); 842 } 843 /* NOTREACHED */ 844 } 845
Indexes created Mon Sep 29 21:09:56 GMT 2025