lfs_vfsops.c revision 1.34
1 /* $NetBSD: lfs_vfsops.c,v 1.34 1999/06/01 03:00:40 perseant 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/mbuf.h> 86 #include <sys/file.h> 87 #include <sys/disklabel.h> 88 #include <sys/ioctl.h> 89 #include <sys/errno.h> 90 #include <sys/malloc.h> 91 #include <sys/pool.h> 92 #include <sys/socket.h> 93 #include <vm/vm.h> 94 #include <sys/sysctl.h> 95 96 #include <miscfs/specfs/specdev.h> 97 98 #include <ufs/ufs/quota.h> 99 #include <ufs/ufs/inode.h> 100 #include <ufs/ufs/ufsmount.h> 101 #include <ufs/ufs/ufs_extern.h> 102 103 #include <ufs/lfs/lfs.h> 104 #include <ufs/lfs/lfs_extern.h> 105 106 int lfs_mountfs __P((struct vnode *, struct mount *, struct proc *)); 107 108 extern struct vnodeopv_desc lfs_vnodeop_opv_desc; 109 extern struct vnodeopv_desc lfs_specop_opv_desc; 110 extern struct vnodeopv_desc lfs_fifoop_opv_desc; 111 112 struct vnodeopv_desc *lfs_vnodeopv_descs[] = { 113 &lfs_vnodeop_opv_desc, 114 &lfs_specop_opv_desc, 115 &lfs_fifoop_opv_desc, 116 NULL, 117 }; 118 119 struct vfsops lfs_vfsops = { 120 MOUNT_LFS, 121 lfs_mount, 122 ufs_start, 123 lfs_unmount, 124 ufs_root, 125 ufs_quotactl, 126 lfs_statfs, 127 lfs_sync, 128 lfs_vget, 129 lfs_fhtovp, 130 lfs_vptofh, 131 lfs_init, 132 lfs_sysctl, 133 NULL, 134 ufs_check_export, 135 lfs_vnodeopv_descs, 136 }; 137 138 struct pool lfs_inode_pool; 139 140 /* 141 * Initialize the filesystem, most work done by ufs_init. 142 */ 143 void 144 lfs_init() 145 { 146 ufs_init(); 147 148 /* 149 * XXX Same structure as FFS inodes? Should we share a common pool? 150 */ 151 pool_init(&lfs_inode_pool, sizeof(struct inode), 0, 0, 0, 152 "lfsinopl", 0, pool_page_alloc_nointr, pool_page_free_nointr, 153 M_LFSNODE); 154 } 155 156 /* 157 * Called by main() when ufs is going to be mounted as root. 158 */ 159 int 160 lfs_mountroot() 161 { 162 extern struct vnode *rootvp; 163 struct mount *mp; 164 struct proc *p = curproc; /* XXX */ 165 int error; 166 167 /* 168 * Get vnodes for swapdev and rootdev. 169 */ 170 if ((error = bdevvp(rootdev, &rootvp))) { 171 printf("lfs_mountroot: can't setup bdevvp's"); 172 return (error); 173 } 174 if ((error = vfs_rootmountalloc(MOUNT_LFS, "root_device", &mp))) 175 return (error); 176 if ((error = lfs_mountfs(rootvp, mp, p))) { 177 mp->mnt_op->vfs_refcount--; 178 vfs_unbusy(mp); 179 free(mp, M_MOUNT); 180 return (error); 181 } 182 simple_lock(&mountlist_slock); 183 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 184 simple_unlock(&mountlist_slock); 185 (void)lfs_statfs(mp, &mp->mnt_stat, p); 186 vfs_unbusy(mp); 187 return (0); 188 } 189 190 /* 191 * VFS Operations. 192 * 193 * mount system call 194 */ 195 int 196 lfs_mount(mp, path, data, ndp, p) 197 register struct mount *mp; 198 const char *path; 199 void *data; 200 struct nameidata *ndp; 201 struct proc *p; 202 { 203 struct vnode *devvp; 204 struct ufs_args args; 205 struct ufsmount *ump = NULL; 206 register struct lfs *fs = NULL; /* LFS */ 207 size_t size; 208 int error; 209 mode_t accessmode; 210 211 error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)); 212 if (error) 213 return (error); 214 215 #if 0 216 /* Until LFS can do NFS right. XXX */ 217 if (args.export.ex_flags & MNT_EXPORTED) 218 return (EINVAL); 219 #endif 220 221 /* 222 * If updating, check whether changing from read-only to 223 * read/write; if there is no device name, that's all we do. 224 */ 225 if (mp->mnt_flag & MNT_UPDATE) { 226 ump = VFSTOUFS(mp); 227 fs = ump->um_lfs; 228 if (fs->lfs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) { 229 /* 230 * If upgrade to read-write by non-root, then verify 231 * that user has necessary permissions on the device. 232 */ 233 if (p->p_ucred->cr_uid != 0) { 234 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 235 error = VOP_ACCESS(ump->um_devvp, VREAD|VWRITE, 236 p->p_ucred, p); 237 VOP_UNLOCK(ump->um_devvp, 0); 238 if (error) 239 return (error); 240 } 241 fs->lfs_ronly = 0; 242 } 243 if (args.fspec == 0) { 244 /* 245 * Process export requests. 246 */ 247 return (vfs_export(mp, &ump->um_export, &args.export)); 248 } 249 } 250 /* 251 * Not an update, or updating the name: look up the name 252 * and verify that it refers to a sensible block device. 253 */ 254 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 255 if ((error = namei(ndp)) != 0) 256 return (error); 257 devvp = ndp->ni_vp; 258 if (devvp->v_type != VBLK) { 259 vrele(devvp); 260 return (ENOTBLK); 261 } 262 if (major(devvp->v_rdev) >= nblkdev) { 263 vrele(devvp); 264 return (ENXIO); 265 } 266 /* 267 * If mount by non-root, then verify that user has necessary 268 * permissions on the device. 269 */ 270 if (p->p_ucred->cr_uid != 0) { 271 accessmode = VREAD; 272 if ((mp->mnt_flag & MNT_RDONLY) == 0) 273 accessmode |= VWRITE; 274 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 275 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 276 if (error) { 277 vput(devvp); 278 return (error); 279 } 280 VOP_UNLOCK(devvp, 0); 281 } 282 if ((mp->mnt_flag & MNT_UPDATE) == 0) 283 error = lfs_mountfs(devvp, mp, p); /* LFS */ 284 else { 285 if (devvp != ump->um_devvp) 286 error = EINVAL; /* needs translation */ 287 else 288 vrele(devvp); 289 } 290 if (error) { 291 vrele(devvp); 292 return (error); 293 } 294 ump = VFSTOUFS(mp); 295 fs = ump->um_lfs; /* LFS */ 296 (void)copyinstr(path, fs->lfs_fsmnt, sizeof(fs->lfs_fsmnt) - 1, &size); 297 bzero(fs->lfs_fsmnt + size, sizeof(fs->lfs_fsmnt) - size); 298 bcopy(fs->lfs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN); 299 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 300 &size); 301 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 302 return (0); 303 } 304 305 /* 306 * Common code for mount and mountroot 307 * LFS specific 308 */ 309 int 310 lfs_mountfs(devvp, mp, p) 311 register struct vnode *devvp; 312 struct mount *mp; 313 struct proc *p; 314 { 315 extern struct vnode *rootvp; 316 struct dlfs *dfs, *adfs; 317 register struct lfs *fs; 318 register struct ufsmount *ump; 319 struct vnode *vp; 320 struct buf *bp, *abp; 321 struct partinfo dpart; 322 dev_t dev; 323 int error, i, ronly, size; 324 struct ucred *cred; 325 SEGUSE *sup; 326 327 cred = p ? p->p_ucred : NOCRED; 328 /* 329 * Disallow multiple mounts of the same device. 330 * Disallow mounting of a device that is currently in use 331 * (except for root, which might share swap device for miniroot). 332 * Flush out any old buffers remaining from a previous use. 333 */ 334 if ((error = vfs_mountedon(devvp)) != 0) 335 return (error); 336 if (vcount(devvp) > 1 && devvp != rootvp) 337 return (EBUSY); 338 if ((error = vinvalbuf(devvp, V_SAVE, cred, p, 0, 0)) != 0) 339 return (error); 340 341 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 342 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 343 if (error) 344 return (error); 345 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, cred, p) != 0) 346 size = DEV_BSIZE; 347 else 348 size = dpart.disklab->d_secsize; 349 350 /* Don't free random space on error. */ 351 bp = NULL; 352 ump = NULL; 353 354 /* Read in the superblock. */ 355 error = bread(devvp, LFS_LABELPAD / size, LFS_SBPAD, cred, &bp); 356 if (error) 357 goto out; 358 dfs = (struct dlfs *)bp->b_data; 359 360 /* 361 * Check the second superblock to see which is newer; then mount 362 * using the older of the two. This is necessary to ensure that 363 * the filesystem is valid if it was not unmounted cleanly. 364 */ 365 error = bread(devvp, dfs->dlfs_sboffs[1], LFS_SBPAD, cred, &abp); 366 if (error) 367 goto out; 368 adfs = (struct dlfs *)abp->b_data; 369 370 if (adfs->dlfs_tstamp < dfs->dlfs_tstamp) /* XXX KS - 1s resolution? */ 371 dfs = adfs; 372 373 /* Check the basics. */ 374 if (dfs->dlfs_magic != LFS_MAGIC || dfs->dlfs_bsize > MAXBSIZE || 375 dfs->dlfs_version > LFS_VERSION || 376 dfs->dlfs_bsize < sizeof(struct dlfs)) { 377 error = EINVAL; /* XXX needs translation */ 378 goto out; 379 } 380 381 /* Allocate the mount structure, copy the superblock into it. */ 382 fs = malloc(sizeof(struct lfs), M_UFSMNT, M_WAITOK); 383 memcpy(&fs->lfs_dlfs, dfs, sizeof(struct dlfs)); 384 ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK); 385 memset((caddr_t)ump, 0, sizeof *ump); 386 ump->um_lfs = fs; 387 if (sizeof(struct lfs) < LFS_SBPAD) /* XXX why? */ 388 bp->b_flags |= B_INVAL; 389 brelse(bp); 390 bp = NULL; 391 brelse(abp); 392 abp = NULL; 393 394 /* Set up the I/O information */ 395 fs->lfs_iocount = 0; 396 fs->lfs_dirvcount = 0; 397 fs->lfs_diropwait = 0; 398 fs->lfs_activesb = 0; 399 #ifdef LFS_CANNOT_ROLLFW 400 fs->lfs_sbactive = NULL; 401 #endif 402 #ifdef LFS_TRACK_IOS 403 for (i=0;i<LFS_THROTTLE;i++) 404 fs->lfs_pending[i] = LFS_UNUSED_DADDR; 405 #endif 406 407 /* Set up the ifile and lock aflags */ 408 fs->lfs_doifile = 0; 409 fs->lfs_writer = 0; 410 fs->lfs_dirops = 0; 411 fs->lfs_seglock = 0; 412 413 /* Set the file system readonly/modify bits. */ 414 fs->lfs_ronly = ronly; 415 if (ronly == 0) 416 fs->lfs_fmod = 1; 417 418 /* Initialize the mount structure. */ 419 dev = devvp->v_rdev; 420 mp->mnt_data = (qaddr_t)ump; 421 mp->mnt_stat.f_fsid.val[0] = (long)dev; 422 mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_LFS); 423 mp->mnt_maxsymlinklen = fs->lfs_maxsymlinklen; 424 mp->mnt_flag |= MNT_LOCAL; 425 ump->um_flags = 0; 426 ump->um_mountp = mp; 427 ump->um_dev = dev; 428 ump->um_devvp = devvp; 429 ump->um_bptrtodb = 0; 430 ump->um_seqinc = 1 << fs->lfs_fsbtodb; 431 ump->um_nindir = fs->lfs_nindir; 432 for (i = 0; i < MAXQUOTAS; i++) 433 ump->um_quotas[i] = NULLVP; 434 devvp->v_specflags |= SI_MOUNTEDON; 435 436 /* 437 * We use the ifile vnode for almost every operation. Instead of 438 * retrieving it from the hash table each time we retrieve it here, 439 * artificially increment the reference count and keep a pointer 440 * to it in the incore copy of the superblock. 441 */ 442 if ((error = VFS_VGET(mp, LFS_IFILE_INUM, &vp)) != 0) 443 goto out; 444 fs->lfs_ivnode = vp; 445 VREF(vp); 446 vput(vp); 447 448 /* 449 * Mark the current segment as ACTIVE, since we're going to 450 * be writing to it. 451 */ 452 LFS_SEGENTRY(sup, fs, datosn(fs, fs->lfs_offset), bp); 453 sup->su_flags |= SEGUSE_DIRTY | SEGUSE_ACTIVE; 454 (void) VOP_BWRITE(bp); 455 456 return (0); 457 out: 458 if (bp) 459 brelse(bp); 460 if (abp) 461 brelse(abp); 462 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, cred, p); 463 if (ump) { 464 free(ump->um_lfs, M_UFSMNT); 465 free(ump, M_UFSMNT); 466 mp->mnt_data = (qaddr_t)0; 467 } 468 return (error); 469 } 470 471 /* 472 * unmount system call 473 */ 474 int 475 lfs_unmount(mp, mntflags, p) 476 struct mount *mp; 477 int mntflags; 478 struct proc *p; 479 { 480 register struct ufsmount *ump; 481 register struct lfs *fs; 482 int error, flags, ronly; 483 extern int lfs_allclean_wakeup; 484 485 flags = 0; 486 if (mntflags & MNT_FORCE) 487 flags |= FORCECLOSE; 488 489 ump = VFSTOUFS(mp); 490 fs = ump->um_lfs; 491 #ifdef QUOTA 492 if (mp->mnt_flag & MNT_QUOTA) { 493 int i; 494 error = vflush(mp, fs->lfs_ivnode, SKIPSYSTEM|flags); 495 if (error) 496 return (error); 497 for (i = 0; i < MAXQUOTAS; i++) { 498 if (ump->um_quotas[i] == NULLVP) 499 continue; 500 quotaoff(p, mp, i); 501 } 502 /* 503 * Here we fall through to vflush again to ensure 504 * that we have gotten rid of all the system vnodes. 505 */ 506 } 507 #endif 508 if ((error = vflush(mp, fs->lfs_ivnode, flags)) != 0) 509 return (error); 510 fs->lfs_clean = 1; 511 if ((error = VFS_SYNC(mp, 1, p->p_ucred, p)) != 0) 512 return (error); 513 if (fs->lfs_ivnode->v_dirtyblkhd.lh_first) 514 panic("lfs_unmount: still dirty blocks on ifile vnode\n"); 515 vrele(fs->lfs_ivnode); 516 vgone(fs->lfs_ivnode); 517 518 ronly = !fs->lfs_ronly; 519 ump->um_devvp->v_specflags &= ~SI_MOUNTEDON; 520 error = VOP_CLOSE(ump->um_devvp, 521 ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 522 vrele(ump->um_devvp); 523 524 /* XXX KS - wake up the cleaner so it can die */ 525 wakeup(&fs->lfs_nextseg); 526 wakeup(&lfs_allclean_wakeup); 527 528 free(fs, M_UFSMNT); 529 free(ump, M_UFSMNT); 530 mp->mnt_data = (qaddr_t)0; 531 mp->mnt_flag &= ~MNT_LOCAL; 532 return (error); 533 } 534 535 /* 536 * Get file system statistics. 537 */ 538 int 539 lfs_statfs(mp, sbp, p) 540 struct mount *mp; 541 register struct statfs *sbp; 542 struct proc *p; 543 { 544 register struct lfs *fs; 545 register struct ufsmount *ump; 546 547 ump = VFSTOUFS(mp); 548 fs = ump->um_lfs; 549 if (fs->lfs_magic != LFS_MAGIC) 550 panic("lfs_statfs: magic"); 551 sbp->f_type = 0; 552 sbp->f_bsize = fs->lfs_fsize; 553 sbp->f_iosize = fs->lfs_bsize; 554 sbp->f_blocks = dbtofrags(fs, fs->lfs_dsize); 555 sbp->f_bfree = dbtofrags(fs, fs->lfs_bfree); 556 /* 557 * To compute the available space. Subtract the minimum free 558 * from the total number of blocks in the file system. Set avail 559 * to the smaller of this number and fs->lfs_bfree. 560 * 561 * XXX KS - is my modification below what is desired? (This 562 * will, e.g., change the report when the cleaner runs.) 563 */ 564 #if 0 565 sbp->f_bavail = (long) ((u_int64_t) fs->lfs_dsize * (u_int64_t) 566 (100 - fs->lfs_minfree) / (u_int64_t) 100); 567 sbp->f_bavail = 568 sbp->f_bavail > fs->lfs_bfree ? fs->lfs_bfree : sbp->f_bavail; 569 #else 570 sbp->f_bavail = (long) ((u_int64_t) fs->lfs_dsize * (u_int64_t) 571 (100 - fs->lfs_minfree) / (u_int64_t) 100) 572 - (u_int64_t)(fs->lfs_dsize - fs->lfs_bfree); 573 #endif 574 sbp->f_bavail = dbtofrags(fs, sbp->f_bavail); 575 sbp->f_files = dbtofsb(fs,fs->lfs_bfree) * INOPB(fs); 576 sbp->f_ffree = sbp->f_files - fs->lfs_nfiles; 577 if (sbp != &mp->mnt_stat) { 578 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 579 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 580 } 581 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 582 return (0); 583 } 584 585 /* 586 * Go through the disk queues to initiate sandbagged IO; 587 * go through the inodes to write those that have been modified; 588 * initiate the writing of the super block if it has been modified. 589 * 590 * Note: we are always called with the filesystem marked `MPBUSY'. 591 */ 592 int 593 lfs_sync(mp, waitfor, cred, p) 594 struct mount *mp; 595 int waitfor; 596 struct ucred *cred; 597 struct proc *p; 598 { 599 int error; 600 struct lfs *fs; 601 602 fs = ((struct ufsmount *)mp->mnt_data)->ufsmount_u.lfs; 603 while(fs->lfs_dirops) 604 error = tsleep(&fs->lfs_dirops, PRIBIO + 1, "lfs_dirops", 0); 605 fs->lfs_writer++; 606 607 /* All syncs must be checkpoints until roll-forward is implemented. */ 608 error = lfs_segwrite(mp, SEGM_CKP | (waitfor ? SEGM_SYNC : 0)); 609 if(--fs->lfs_writer==0) 610 wakeup(&fs->lfs_dirops); 611 #ifdef QUOTA 612 qsync(mp); 613 #endif 614 return (error); 615 } 616 617 #ifdef USE_UFS_HASHLOCK 618 extern struct lock ufs_hashlock; 619 #endif 620 621 /* 622 * Look up an LFS dinode number to find its incore vnode. If not already 623 * in core, read it in from the specified device. Return the inode locked. 624 * Detection and handling of mount points must be done by the calling routine. 625 */ 626 int 627 lfs_vget(mp, ino, vpp) 628 struct mount *mp; 629 ino_t ino; 630 struct vnode **vpp; 631 { 632 register struct lfs *fs; 633 register struct inode *ip; 634 struct buf *bp; 635 struct ifile *ifp; 636 struct vnode *vp; 637 struct ufsmount *ump; 638 ufs_daddr_t daddr; 639 dev_t dev; 640 int error; 641 #ifdef LFS_ATIME_IFILE 642 struct timespec ts; 643 #endif 644 645 ump = VFSTOUFS(mp); 646 dev = ump->um_dev; 647 648 #ifdef USE_UFS_HASHLOCK 649 do { 650 #endif 651 if ((*vpp = ufs_ihashget(dev, ino)) != NULL) 652 return (0); 653 #ifdef USE_UFS_HASHLOCK 654 } while (lockmgr(&ufs_hashlock, LK_EXCLUSIVE|LK_SLEEPFAIL, 0)); 655 #endif 656 657 /* Translate the inode number to a disk address. */ 658 fs = ump->um_lfs; 659 if (ino == LFS_IFILE_INUM) 660 daddr = fs->lfs_idaddr; 661 else { 662 LFS_IENTRY(ifp, fs, ino, bp); 663 daddr = ifp->if_daddr; 664 #ifdef LFS_ATIME_IFILE 665 ts = ifp->if_atime; /* structure copy */ 666 #endif 667 brelse(bp); 668 if (daddr == LFS_UNUSED_DADDR) { 669 #ifdef USE_UFS_HASHLOCK 670 lockmgr(&ufs_hashlock, LK_RELEASE, 0); 671 #endif 672 return (ENOENT); 673 } 674 } 675 676 /* Allocate new vnode/inode. */ 677 if ((error = lfs_vcreate(mp, ino, &vp)) != 0) { 678 *vpp = NULL; 679 #ifdef USE_UFS_HASHLOCK 680 lockmgr(&ufs_hashlock, LK_RELEASE, 0); 681 #endif 682 return (error); 683 } 684 685 /* 686 * Put it onto its hash chain and lock it so that other requests for 687 * this inode will block if they arrive while we are sleeping waiting 688 * for old data structures to be purged or for the contents of the 689 * disk portion of this inode to be read. 690 */ 691 ip = VTOI(vp); 692 ufs_ihashins(ip); 693 #ifdef USE_UFS_HASHLOCK 694 lockmgr(&ufs_hashlock, LK_RELEASE, 0); 695 #endif 696 697 /* 698 * XXX 699 * This may not need to be here, logically it should go down with 700 * the i_devvp initialization. 701 * Ask Kirk. 702 */ 703 ip->i_lfs = ump->um_lfs; 704 705 /* Read in the disk contents for the inode, copy into the inode. */ 706 error = bread(ump->um_devvp, daddr, (int)fs->lfs_bsize, NOCRED, &bp); 707 if (error) { 708 /* 709 * The inode does not contain anything useful, so it would 710 * be misleading to leave it on its hash chain. With mode 711 * still zero, it will be unlinked and returned to the free 712 * list by vput(). 713 */ 714 vput(vp); 715 brelse(bp); 716 *vpp = NULL; 717 return (error); 718 } 719 ip->i_din.ffs_din = *lfs_ifind(fs, ino, (struct dinode *)bp->b_data); 720 #ifdef LFS_ATIME_IFILE 721 ip->i_ffs_atime = ts.tv_sec; 722 ip->i_ffs_atimensec = ts.tv_nsec; 723 #endif 724 brelse(bp); 725 726 /* 727 * Initialize the vnode from the inode, check for aliases. In all 728 * cases re-init ip, the underlying vnode/inode may have changed. 729 */ 730 error = ufs_vinit(mp, lfs_specop_p, lfs_fifoop_p, &vp); 731 if (error) { 732 vput(vp); 733 *vpp = NULL; 734 return (error); 735 } 736 if(vp->v_type == VNON) { 737 printf("lfs_vget: ino %d is type VNON! (ifmt %o)\n", ip->i_number, (ip->i_ffs_mode&IFMT)>>12); 738 #ifdef DDB 739 Debugger(); 740 #endif 741 } 742 /* 743 * Finish inode initialization now that aliasing has been resolved. 744 */ 745 ip->i_devvp = ump->um_devvp; 746 VREF(ip->i_devvp); 747 *vpp = vp; 748 749 return (0); 750 } 751 752 /* 753 * File handle to vnode 754 * 755 * Have to be really careful about stale file handles: 756 * - check that the inode number is valid 757 * - call lfs_vget() to get the locked inode 758 * - check for an unallocated inode (i_mode == 0) 759 * 760 * XXX 761 * use ifile to see if inode is allocated instead of reading off disk 762 * what is the relationship between my generational number and the NFS 763 * generational number. 764 */ 765 int 766 lfs_fhtovp(mp, fhp, vpp) 767 register struct mount *mp; 768 struct fid *fhp; 769 struct vnode **vpp; 770 { 771 register struct ufid *ufhp; 772 773 ufhp = (struct ufid *)fhp; 774 if (ufhp->ufid_ino < ROOTINO) 775 return (ESTALE); 776 return (ufs_fhtovp(mp, ufhp, vpp)); 777 } 778 779 /* 780 * Vnode pointer to File handle 781 */ 782 /* ARGSUSED */ 783 int 784 lfs_vptofh(vp, fhp) 785 struct vnode *vp; 786 struct fid *fhp; 787 { 788 register struct inode *ip; 789 register struct ufid *ufhp; 790 791 ip = VTOI(vp); 792 ufhp = (struct ufid *)fhp; 793 ufhp->ufid_len = sizeof(struct ufid); 794 ufhp->ufid_ino = ip->i_number; 795 ufhp->ufid_gen = ip->i_ffs_gen; 796 return (0); 797 } 798 799 int 800 lfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 801 int *name; 802 u_int namelen; 803 void *oldp; 804 size_t *oldlenp; 805 void *newp; 806 size_t newlen; 807 struct proc *p; 808 { 809 extern int lfs_writeindir, lfs_dostats, lfs_clean_vnhead; 810 extern struct lfs_stats lfs_stats; 811 int error; 812 813 /* all sysctl names at this level are terminal */ 814 if (namelen != 1) 815 return (ENOTDIR); 816 817 switch (name[0]) { 818 case LFS_WRITEINDIR: 819 return (sysctl_int(oldp, oldlenp, newp, newlen, 820 &lfs_writeindir)); 821 case LFS_CLEAN_VNHEAD: 822 return (sysctl_int(oldp, oldlenp, newp, newlen, 823 &lfs_clean_vnhead)); 824 case LFS_DOSTATS: 825 if((error = sysctl_int(oldp, oldlenp, newp, newlen, 826 &lfs_dostats))) 827 return error; 828 if(lfs_dostats == 0) 829 memset(&lfs_stats,0,sizeof(lfs_stats)); 830 return 0; 831 case LFS_STATS: 832 return (sysctl_rdstruct(oldp, oldlenp, newp, 833 &lfs_stats, sizeof(lfs_stats))); 834 default: 835 return (EOPNOTSUPP); 836 } 837 /* NOTREACHED */ 838 } 839
Indexes created Tue Sep 30 07:10:03 GMT 2025