lfs_rfw.c revision 1.9.10.1
1 /* $NetBSD: lfs_rfw.c,v 1.9.10.1 2008/05/16 02:26:00 yamt Exp $ */ 2 3 /*- 4 * Copyright (c) 1999, 2000, 2001, 2002, 2003 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: lfs_rfw.c,v 1.9.10.1 2008/05/16 02:26:00 yamt Exp $"); 34 35 #if defined(_KERNEL_OPT) 36 #include "opt_quota.h" 37 #endif 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/namei.h> 42 #include <sys/proc.h> 43 #include <sys/kernel.h> 44 #include <sys/vnode.h> 45 #include <sys/mount.h> 46 #include <sys/kthread.h> 47 #include <sys/buf.h> 48 #include <sys/device.h> 49 #include <sys/mbuf.h> 50 #include <sys/file.h> 51 #include <sys/disklabel.h> 52 #include <sys/ioctl.h> 53 #include <sys/errno.h> 54 #include <sys/malloc.h> 55 #include <sys/pool.h> 56 #include <sys/socket.h> 57 #include <sys/syslog.h> 58 #include <uvm/uvm_extern.h> 59 #include <sys/sysctl.h> 60 #include <sys/conf.h> 61 #include <sys/kauth.h> 62 63 #include <miscfs/specfs/specdev.h> 64 65 #include <ufs/ufs/quota.h> 66 #include <ufs/ufs/inode.h> 67 #include <ufs/ufs/ufsmount.h> 68 #include <ufs/ufs/ufs_extern.h> 69 70 #include <uvm/uvm.h> 71 #include <uvm/uvm_stat.h> 72 #include <uvm/uvm_pager.h> 73 #include <uvm/uvm_pdaemon.h> 74 75 #include <ufs/lfs/lfs.h> 76 #include <ufs/lfs/lfs_extern.h> 77 78 #include <miscfs/genfs/genfs.h> 79 #include <miscfs/genfs/genfs_node.h> 80 81 /* 82 * Roll-forward code. 83 */ 84 static daddr_t check_segsum(struct lfs *, daddr_t, u_int64_t, 85 kauth_cred_t, int, int *, struct lwp *); 86 87 extern int lfs_do_rfw; 88 89 /* 90 * Allocate a particular inode with a particular version number, freeing 91 * any previous versions of this inode that may have gone before. 92 * Used by the roll-forward code. 93 * 94 * XXX this function does not have appropriate locking to be used on a live fs; 95 * XXX but something similar could probably be used for an "undelete" call. 96 * 97 * Called with the Ifile inode locked. 98 */ 99 int 100 lfs_rf_valloc(struct lfs *fs, ino_t ino, int vers, struct lwp *l, 101 struct vnode **vpp) 102 { 103 IFILE *ifp; 104 struct buf *bp, *cbp; 105 struct vnode *vp; 106 struct inode *ip; 107 ino_t tino, oldnext; 108 int error; 109 CLEANERINFO *cip; 110 111 ASSERT_SEGLOCK(fs); /* XXX it doesn't, really */ 112 113 /* 114 * First, just try a vget. If the version number is the one we want, 115 * we don't have to do anything else. If the version number is wrong, 116 * take appropriate action. 117 */ 118 error = VFS_VGET(fs->lfs_ivnode->v_mount, ino, &vp); 119 if (error == 0) { 120 DLOG((DLOG_RF, "lfs_rf_valloc[1]: ino %d vp %p\n", ino, vp)); 121 122 *vpp = vp; 123 ip = VTOI(vp); 124 if (ip->i_gen == vers) 125 return 0; 126 else if (ip->i_gen < vers) { 127 lfs_truncate(vp, (off_t)0, 0, NOCRED); 128 ip->i_gen = ip->i_ffs1_gen = vers; 129 LFS_SET_UINO(ip, IN_CHANGE | IN_UPDATE); 130 return 0; 131 } else { 132 DLOG((DLOG_RF, "ino %d: sought version %d, got %d\n", 133 ino, vers, ip->i_ffs1_gen)); 134 vput(vp); 135 *vpp = NULLVP; 136 return EEXIST; 137 } 138 } 139 140 /* 141 * The inode is not in use. Find it on the free list. 142 */ 143 /* If the Ifile is too short to contain this inum, extend it */ 144 while (VTOI(fs->lfs_ivnode)->i_size <= (ino / 145 fs->lfs_ifpb + fs->lfs_cleansz + fs->lfs_segtabsz) 146 << fs->lfs_bshift) { 147 lfs_extend_ifile(fs, NOCRED); 148 } 149 150 LFS_IENTRY(ifp, fs, ino, bp); 151 oldnext = ifp->if_nextfree; 152 ifp->if_version = vers; 153 brelse(bp, 0); 154 155 LFS_GET_HEADFREE(fs, cip, cbp, &ino); 156 if (ino) { 157 LFS_PUT_HEADFREE(fs, cip, cbp, oldnext); 158 } else { 159 tino = ino; 160 while (1) { 161 LFS_IENTRY(ifp, fs, tino, bp); 162 if (ifp->if_nextfree == ino || 163 ifp->if_nextfree == LFS_UNUSED_INUM) 164 break; 165 tino = ifp->if_nextfree; 166 brelse(bp, 0); 167 } 168 if (ifp->if_nextfree == LFS_UNUSED_INUM) { 169 brelse(bp, 0); 170 return ENOENT; 171 } 172 ifp->if_nextfree = oldnext; 173 LFS_BWRITE_LOG(bp); 174 } 175 176 error = lfs_ialloc(fs, fs->lfs_ivnode, ino, vers, &vp); 177 if (error == 0) { 178 /* 179 * Make it VREG so we can put blocks on it. We will change 180 * this later if it turns out to be some other kind of file. 181 */ 182 ip = VTOI(vp); 183 ip->i_mode = ip->i_ffs1_mode = IFREG; 184 ip->i_nlink = ip->i_ffs1_nlink = 1; 185 ip->i_ffs_effnlink = 1; 186 ufs_vinit(vp->v_mount, lfs_specop_p, lfs_fifoop_p, &vp); 187 ip = VTOI(vp); 188 189 DLOG((DLOG_RF, "lfs_rf_valloc: ino %d vp %p\n", ino, vp)); 190 191 /* The dirop-nature of this vnode is past */ 192 lfs_unmark_vnode(vp); 193 (void)lfs_vunref(vp); 194 vp->v_uflag &= ~VU_DIROP; 195 mutex_enter(&lfs_lock); 196 --lfs_dirvcount; 197 --fs->lfs_dirvcount; 198 TAILQ_REMOVE(&fs->lfs_dchainhd, ip, i_lfs_dchain); 199 wakeup(&lfs_dirvcount); 200 wakeup(&fs->lfs_dirvcount); 201 mutex_exit(&lfs_lock); 202 } 203 *vpp = vp; 204 return error; 205 } 206 207 /* 208 * Load the appropriate indirect block, and change the appropriate pointer. 209 * Mark the block dirty. Do segment and avail accounting. 210 */ 211 static int 212 update_meta(struct lfs *fs, ino_t ino, int vers, daddr_t lbn, 213 daddr_t ndaddr, size_t size, struct lwp *l) 214 { 215 int error; 216 struct vnode *vp; 217 struct inode *ip; 218 #ifdef DEBUG 219 daddr_t odaddr; 220 struct indir a[NIADDR]; 221 int num; 222 int i; 223 #endif /* DEBUG */ 224 struct buf *bp; 225 SEGUSE *sup; 226 227 KASSERT(lbn >= 0); /* no indirect blocks */ 228 229 if ((error = lfs_rf_valloc(fs, ino, vers, l, &vp)) != 0) { 230 DLOG((DLOG_RF, "update_meta: ino %d: lfs_rf_valloc" 231 " returned %d\n", ino, error)); 232 return error; 233 } 234 235 if ((error = lfs_balloc(vp, (lbn << fs->lfs_bshift), size, 236 NOCRED, 0, &bp)) != 0) { 237 vput(vp); 238 return (error); 239 } 240 /* No need to write, the block is already on disk */ 241 if (bp->b_oflags & BO_DELWRI) { 242 LFS_UNLOCK_BUF(bp); 243 fs->lfs_avail += btofsb(fs, bp->b_bcount); 244 } 245 brelse(bp, BC_INVAL); 246 247 /* 248 * Extend the file, if it is not large enough already. 249 * XXX this is not exactly right, we don't know how much of the 250 * XXX last block is actually used. We hope that an inode will 251 * XXX appear later to give the correct size. 252 */ 253 ip = VTOI(vp); 254 if (ip->i_size <= (lbn << fs->lfs_bshift)) { 255 u_int64_t newsize; 256 257 if (lbn < NDADDR) 258 newsize = ip->i_ffs1_size = (lbn << fs->lfs_bshift) + 259 (size - fs->lfs_fsize) + 1; 260 else 261 newsize = ip->i_ffs1_size = (lbn << fs->lfs_bshift) + 1; 262 263 if (ip->i_size < newsize) { 264 ip->i_size = newsize; 265 /* 266 * tell vm our new size for the case the inode won't 267 * appear later. 268 */ 269 uvm_vnp_setsize(vp, newsize); 270 } 271 } 272 273 lfs_update_single(fs, NULL, vp, lbn, ndaddr, size); 274 275 LFS_SEGENTRY(sup, fs, dtosn(fs, ndaddr), bp); 276 sup->su_nbytes += size; 277 LFS_WRITESEGENTRY(sup, fs, dtosn(fs, ndaddr), bp); 278 279 /* differences here should be due to UNWRITTEN indirect blocks. */ 280 KASSERT((lblkno(fs, ip->i_size) > NDADDR && 281 ip->i_lfs_effnblks == ip->i_ffs1_blocks) || 282 ip->i_lfs_effnblks >= ip->i_ffs1_blocks); 283 284 #ifdef DEBUG 285 /* Now look again to make sure it worked */ 286 ufs_bmaparray(vp, lbn, &odaddr, &a[0], &num, NULL, NULL); 287 for (i = num; i > 0; i--) { 288 if (!a[i].in_exists) 289 panic("update_meta: absent %d lv indirect block", i); 290 } 291 if (dbtofsb(fs, odaddr) != ndaddr) 292 DLOG((DLOG_RF, "update_meta: failed setting ino %d lbn %" 293 PRId64 " to %" PRId64 "\n", ino, lbn, ndaddr)); 294 #endif /* DEBUG */ 295 vput(vp); 296 return 0; 297 } 298 299 static int 300 update_inoblk(struct lfs *fs, daddr_t offset, kauth_cred_t cred, 301 struct lwp *l) 302 { 303 struct vnode *devvp, *vp; 304 struct inode *ip; 305 struct ufs1_dinode *dip; 306 struct buf *dbp, *ibp; 307 int error; 308 daddr_t daddr; 309 IFILE *ifp; 310 SEGUSE *sup; 311 312 devvp = VTOI(fs->lfs_ivnode)->i_devvp; 313 314 /* 315 * Get the inode, update times and perms. 316 * DO NOT update disk blocks, we do that separately. 317 */ 318 error = bread(devvp, fsbtodb(fs, offset), fs->lfs_ibsize, cred, &dbp); 319 if (error) { 320 DLOG((DLOG_RF, "update_inoblk: bread returned %d\n", error)); 321 return error; 322 } 323 dip = ((struct ufs1_dinode *)(dbp->b_data)) + INOPB(fs); 324 while (--dip >= (struct ufs1_dinode *)dbp->b_data) { 325 if (dip->di_inumber > LFS_IFILE_INUM) { 326 error = lfs_rf_valloc(fs, dip->di_inumber, dip->di_gen, 327 l, &vp); 328 if (error) { 329 DLOG((DLOG_RF, "update_inoblk: lfs_rf_valloc" 330 " returned %d\n", error)); 331 continue; 332 } 333 ip = VTOI(vp); 334 if (dip->di_size != ip->i_size) 335 lfs_truncate(vp, dip->di_size, 0, NOCRED); 336 /* Get mode, link count, size, and times */ 337 memcpy(ip->i_din.ffs1_din, dip, 338 offsetof(struct ufs1_dinode, di_db[0])); 339 340 /* Then the rest, except di_blocks */ 341 ip->i_flags = ip->i_ffs1_flags = dip->di_flags; 342 ip->i_gen = ip->i_ffs1_gen = dip->di_gen; 343 ip->i_uid = ip->i_ffs1_uid = dip->di_uid; 344 ip->i_gid = ip->i_ffs1_gid = dip->di_gid; 345 346 ip->i_mode = ip->i_ffs1_mode; 347 ip->i_nlink = ip->i_ffs_effnlink = ip->i_ffs1_nlink; 348 ip->i_size = ip->i_ffs1_size; 349 350 LFS_SET_UINO(ip, IN_CHANGE | IN_UPDATE); 351 352 /* Re-initialize to get type right */ 353 ufs_vinit(vp->v_mount, lfs_specop_p, lfs_fifoop_p, 354 &vp); 355 vput(vp); 356 357 /* Record change in location */ 358 LFS_IENTRY(ifp, fs, dip->di_inumber, ibp); 359 daddr = ifp->if_daddr; 360 ifp->if_daddr = dbtofsb(fs, dbp->b_blkno); 361 error = LFS_BWRITE_LOG(ibp); /* Ifile */ 362 /* And do segment accounting */ 363 if (dtosn(fs, daddr) != dtosn(fs, dbtofsb(fs, dbp->b_blkno))) { 364 if (daddr > 0) { 365 LFS_SEGENTRY(sup, fs, dtosn(fs, daddr), 366 ibp); 367 sup->su_nbytes -= sizeof (struct ufs1_dinode); 368 LFS_WRITESEGENTRY(sup, fs, 369 dtosn(fs, daddr), 370 ibp); 371 } 372 LFS_SEGENTRY(sup, fs, dtosn(fs, dbtofsb(fs, dbp->b_blkno)), 373 ibp); 374 sup->su_nbytes += sizeof (struct ufs1_dinode); 375 LFS_WRITESEGENTRY(sup, fs, 376 dtosn(fs, dbtofsb(fs, dbp->b_blkno)), 377 ibp); 378 } 379 } 380 } 381 brelse(dbp, BC_AGE); 382 383 return 0; 384 } 385 386 #define CHECK_CKSUM 0x0001 /* Check the checksum to make sure it's valid */ 387 #define CHECK_UPDATE 0x0002 /* Update Ifile for new data blocks / inodes */ 388 389 static daddr_t 390 check_segsum(struct lfs *fs, daddr_t offset, u_int64_t nextserial, 391 kauth_cred_t cred, int flags, int *pseg_flags, struct lwp *l) 392 { 393 struct vnode *devvp; 394 struct buf *bp, *dbp; 395 int error, nblocks = 0, ninos, i, j; /* XXX: gcc */ 396 SEGSUM *ssp; 397 u_long *dp = NULL, *datap = NULL; /* XXX u_int32_t */ 398 daddr_t oldoffset; 399 int32_t *iaddr; /* XXX ondisk32 */ 400 FINFO *fip; 401 SEGUSE *sup; 402 size_t size; 403 404 devvp = VTOI(fs->lfs_ivnode)->i_devvp; 405 /* 406 * If the segment has a superblock and we're at the top 407 * of the segment, skip the superblock. 408 */ 409 if (sntod(fs, dtosn(fs, offset)) == offset) { 410 LFS_SEGENTRY(sup, fs, dtosn(fs, offset), bp); 411 if (sup->su_flags & SEGUSE_SUPERBLOCK) 412 offset += btofsb(fs, LFS_SBPAD); 413 brelse(bp, 0); 414 } 415 416 /* Read in the segment summary */ 417 error = bread(devvp, fsbtodb(fs, offset), fs->lfs_sumsize, cred, &bp); 418 if (error) 419 return -1; 420 421 /* Check summary checksum */ 422 ssp = (SEGSUM *)bp->b_data; 423 if (flags & CHECK_CKSUM) { 424 if (ssp->ss_sumsum != cksum(&ssp->ss_datasum, 425 fs->lfs_sumsize - 426 sizeof(ssp->ss_sumsum))) { 427 DLOG((DLOG_RF, "Sumsum error at 0x%" PRIx64 "\n", offset)); 428 offset = -1; 429 goto err1; 430 } 431 if (ssp->ss_nfinfo == 0 && ssp->ss_ninos == 0) { 432 DLOG((DLOG_RF, "Empty pseg at 0x%" PRIx64 "\n", offset)); 433 offset = -1; 434 goto err1; 435 } 436 if (ssp->ss_create < fs->lfs_tstamp) { 437 DLOG((DLOG_RF, "Old data at 0x%" PRIx64 "\n", offset)); 438 offset = -1; 439 goto err1; 440 } 441 } 442 if (fs->lfs_version > 1) { 443 if (ssp->ss_serial != nextserial) { 444 DLOG((DLOG_RF, "Unexpected serial number at 0x%" PRIx64 445 "\n", offset)); 446 offset = -1; 447 goto err1; 448 } 449 if (ssp->ss_ident != fs->lfs_ident) { 450 DLOG((DLOG_RF, "Incorrect fsid (0x%x vs 0x%x) at 0x%" 451 PRIx64 "\n", ssp->ss_ident, fs->lfs_ident, offset)); 452 offset = -1; 453 goto err1; 454 } 455 } 456 if (pseg_flags) 457 *pseg_flags = ssp->ss_flags; 458 oldoffset = offset; 459 offset += btofsb(fs, fs->lfs_sumsize); 460 461 ninos = howmany(ssp->ss_ninos, INOPB(fs)); 462 /* XXX ondisk32 */ 463 iaddr = (int32_t *)((char*)bp->b_data + fs->lfs_sumsize - sizeof(int32_t)); 464 if (flags & CHECK_CKSUM) { 465 /* Count blocks */ 466 nblocks = 0; 467 fip = (FINFO *)((char*)bp->b_data + SEGSUM_SIZE(fs)); 468 for (i = 0; i < ssp->ss_nfinfo; ++i) { 469 nblocks += fip->fi_nblocks; 470 if (fip->fi_nblocks <= 0) 471 break; 472 /* XXX ondisk32 */ 473 fip = (FINFO *)(((char *)fip) + FINFOSIZE + 474 (fip->fi_nblocks * sizeof(int32_t))); 475 } 476 nblocks += ninos; 477 /* Create the sum array */ 478 datap = dp = (u_long *)malloc(nblocks * sizeof(u_long), 479 M_SEGMENT, M_WAITOK); 480 } 481 482 /* Handle individual blocks */ 483 fip = (FINFO *)((char*)bp->b_data + SEGSUM_SIZE(fs)); 484 for (i = 0; i < ssp->ss_nfinfo || ninos; ++i) { 485 /* Inode block? */ 486 if (ninos && *iaddr == offset) { 487 if (flags & CHECK_CKSUM) { 488 /* Read in the head and add to the buffer */ 489 error = bread(devvp, fsbtodb(fs, offset), fs->lfs_bsize, 490 cred, &dbp); 491 if (error) { 492 offset = -1; 493 goto err2; 494 } 495 (*dp++) = ((u_long *)(dbp->b_data))[0]; 496 brelse(dbp, BC_AGE); 497 } 498 if (flags & CHECK_UPDATE) { 499 if ((error = update_inoblk(fs, offset, cred, l)) 500 != 0) { 501 offset = -1; 502 goto err2; 503 } 504 } 505 offset += btofsb(fs, fs->lfs_ibsize); 506 --iaddr; 507 --ninos; 508 --i; /* compensate */ 509 continue; 510 } 511 size = fs->lfs_bsize; 512 for (j = 0; j < fip->fi_nblocks; ++j) { 513 if (j == fip->fi_nblocks - 1) 514 size = fip->fi_lastlength; 515 if (flags & CHECK_CKSUM) { 516 error = bread(devvp, fsbtodb(fs, offset), size, cred, &dbp); 517 if (error) { 518 offset = -1; 519 goto err2; 520 } 521 (*dp++) = ((u_long *)(dbp->b_data))[0]; 522 brelse(dbp, BC_AGE); 523 } 524 /* Account for and update any direct blocks */ 525 if ((flags & CHECK_UPDATE) && 526 fip->fi_ino > LFS_IFILE_INUM && 527 fip->fi_blocks[j] >= 0) { 528 update_meta(fs, fip->fi_ino, fip->fi_version, 529 fip->fi_blocks[j], offset, size, l); 530 } 531 offset += btofsb(fs, size); 532 } 533 /* XXX ondisk32 */ 534 fip = (FINFO *)(((char *)fip) + FINFOSIZE 535 + fip->fi_nblocks * sizeof(int32_t)); 536 } 537 /* Checksum the array, compare */ 538 if ((flags & CHECK_CKSUM) && 539 ssp->ss_datasum != cksum(datap, nblocks * sizeof(u_long))) 540 { 541 DLOG((DLOG_RF, "Datasum error at 0x%" PRIx64 542 " (wanted %x got %x)\n", 543 offset, ssp->ss_datasum, cksum(datap, nblocks * 544 sizeof(u_long)))); 545 offset = -1; 546 goto err2; 547 } 548 549 /* If we're at the end of the segment, move to the next */ 550 if (dtosn(fs, offset + btofsb(fs, fs->lfs_sumsize + fs->lfs_bsize)) != 551 dtosn(fs, offset)) { 552 if (dtosn(fs, offset) == dtosn(fs, ssp->ss_next)) { 553 offset = -1; 554 goto err2; 555 } 556 offset = ssp->ss_next; 557 DLOG((DLOG_RF, "LFS roll forward: moving to offset 0x%" PRIx64 558 " -> segment %d\n", offset, dtosn(fs,offset))); 559 } 560 561 if (flags & CHECK_UPDATE) { 562 fs->lfs_avail -= (offset - oldoffset); 563 /* Don't clog the buffer queue */ 564 mutex_enter(&lfs_lock); 565 if (locked_queue_count > LFS_MAX_BUFS || 566 locked_queue_bytes > LFS_MAX_BYTES) { 567 lfs_flush(fs, SEGM_CKP, 0); 568 } 569 mutex_exit(&lfs_lock); 570 } 571 572 err2: 573 if (flags & CHECK_CKSUM) 574 free(datap, M_SEGMENT); 575 err1: 576 brelse(bp, BC_AGE); 577 578 /* XXX should we update the serial number even for bad psegs? */ 579 if ((flags & CHECK_UPDATE) && offset > 0 && fs->lfs_version > 1) 580 fs->lfs_serial = nextserial; 581 return offset; 582 } 583 584 void 585 lfs_roll_forward(struct lfs *fs, struct mount *mp, struct lwp *l) 586 { 587 int flags, dirty; 588 daddr_t offset, oldoffset, lastgoodpseg; 589 int sn, curseg, do_rollforward; 590 struct proc *p; 591 kauth_cred_t cred; 592 SEGUSE *sup; 593 struct buf *bp; 594 595 p = l ? l->l_proc : NULL; 596 cred = p ? p->p_cred : NOCRED; 597 598 /* 599 * Roll forward. 600 * 601 * We don't roll forward for v1 filesystems, because 602 * of the danger that the clock was turned back between the last 603 * checkpoint and crash. This would roll forward garbage. 604 * 605 * v2 filesystems don't have this problem because they use a 606 * monotonically increasing serial number instead of a timestamp. 607 */ 608 do_rollforward = (!(fs->lfs_pflags & LFS_PF_CLEAN) && 609 lfs_do_rfw && fs->lfs_version > 1 && p != NULL); 610 if (do_rollforward) { 611 u_int64_t nextserial; 612 /* 613 * Phase I: Find the address of the last good partial 614 * segment that was written after the checkpoint. Mark 615 * the segments in question dirty, so they won't be 616 * reallocated. 617 */ 618 lastgoodpseg = oldoffset = offset = fs->lfs_offset; 619 flags = 0x0; 620 DLOG((DLOG_RF, "LFS roll forward phase 1: start at offset 0x%" 621 PRIx64 "\n", offset)); 622 LFS_SEGENTRY(sup, fs, dtosn(fs, offset), bp); 623 if (!(sup->su_flags & SEGUSE_DIRTY)) 624 --fs->lfs_nclean; 625 sup->su_flags |= SEGUSE_DIRTY; 626 LFS_WRITESEGENTRY(sup, fs, dtosn(fs, offset), bp); 627 nextserial = fs->lfs_serial + 1; 628 while ((offset = check_segsum(fs, offset, nextserial, 629 cred, CHECK_CKSUM, &flags, l)) > 0) { 630 nextserial++; 631 if (sntod(fs, oldoffset) != sntod(fs, offset)) { 632 LFS_SEGENTRY(sup, fs, dtosn(fs, oldoffset), 633 bp); 634 if (!(sup->su_flags & SEGUSE_DIRTY)) 635 --fs->lfs_nclean; 636 sup->su_flags |= SEGUSE_DIRTY; 637 LFS_WRITESEGENTRY(sup, fs, dtosn(fs, oldoffset), 638 bp); 639 } 640 641 DLOG((DLOG_RF, "LFS roll forward phase 1: offset=0x%" 642 PRIx64 "\n", offset)); 643 if (flags & SS_DIROP) { 644 DLOG((DLOG_RF, "lfs_mountfs: dirops at 0x%" 645 PRIx64 "\n", oldoffset)); 646 if (!(flags & SS_CONT)) { 647 DLOG((DLOG_RF, "lfs_mountfs: dirops end " 648 "at 0x%" PRIx64 "\n", oldoffset)); 649 } 650 } 651 if (!(flags & SS_CONT)) 652 lastgoodpseg = offset; 653 oldoffset = offset; 654 } 655 if (flags & SS_CONT) { 656 DLOG((DLOG_RF, "LFS roll forward: warning: incomplete " 657 "dirops discarded\n")); 658 } 659 DLOG((DLOG_RF, "LFS roll forward phase 1: completed: " 660 "lastgoodpseg=0x%" PRIx64 "\n", lastgoodpseg)); 661 oldoffset = fs->lfs_offset; 662 if (fs->lfs_offset != lastgoodpseg) { 663 /* Don't overwrite what we're trying to preserve */ 664 offset = fs->lfs_offset; 665 fs->lfs_offset = lastgoodpseg; 666 fs->lfs_curseg = sntod(fs, dtosn(fs, fs->lfs_offset)); 667 for (sn = curseg = dtosn(fs, fs->lfs_curseg);;) { 668 sn = (sn + 1) % fs->lfs_nseg; 669 if (sn == curseg) 670 panic("lfs_mountfs: no clean segments"); 671 LFS_SEGENTRY(sup, fs, sn, bp); 672 dirty = (sup->su_flags & SEGUSE_DIRTY); 673 brelse(bp, 0); 674 if (!dirty) 675 break; 676 } 677 fs->lfs_nextseg = sntod(fs, sn); 678 679 /* 680 * Phase II: Roll forward from the first superblock. 681 */ 682 while (offset != lastgoodpseg) { 683 DLOG((DLOG_RF, "LFS roll forward phase 2: 0x%" 684 PRIx64 "\n", offset)); 685 offset = check_segsum(fs, offset, 686 fs->lfs_serial + 1, cred, CHECK_UPDATE, 687 NULL, l); 688 } 689 690 /* 691 * Finish: flush our changes to disk. 692 */ 693 lfs_segwrite(mp, SEGM_CKP | SEGM_SYNC); 694 DLOG((DLOG_RF, "lfs_mountfs: roll forward ", 695 "recovered %lld blocks\n", 696 (long long)(lastgoodpseg - oldoffset))); 697 } 698 DLOG((DLOG_RF, "LFS roll forward complete\n")); 699 } 700 } 701
Indexes created Tue Oct 21 16:10:11 GMT 2025