lfs_rfw.c revision 1.30
1 /* $NetBSD: lfs_rfw.c,v 1.30 2015/08/19 20:33:29 dholland 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 1.30 2015/08/19 20:33:29 dholland 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/lfs/ulfs_quotacommon.h> 66 #include <ufs/lfs/ulfs_inode.h> 67 #include <ufs/lfs/ulfsmount.h> 68 #include <ufs/lfs/ulfs_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_accessors.h> 77 #include <ufs/lfs/lfs_kernel.h> 78 #include <ufs/lfs/lfs_extern.h> 79 80 #include <miscfs/genfs/genfs.h> 81 #include <miscfs/genfs/genfs_node.h> 82 83 /* 84 * Roll-forward code. 85 */ 86 static daddr_t check_segsum(struct lfs *, daddr_t, u_int64_t, 87 kauth_cred_t, int, int *, struct lwp *); 88 89 extern int lfs_do_rfw; 90 91 /* 92 * Allocate a particular inode with a particular version number, freeing 93 * any previous versions of this inode that may have gone before. 94 * Used by the roll-forward code. 95 * 96 * XXX this function does not have appropriate locking to be used on a live fs; 97 * XXX but something similar could probably be used for an "undelete" call. 98 * 99 * Called with the Ifile inode locked. 100 */ 101 int 102 lfs_rf_valloc(struct lfs *fs, ino_t ino, int vers, struct lwp *l, 103 struct vnode **vpp) 104 { 105 struct vattr va; 106 struct vnode *vp; 107 struct inode *ip; 108 int error; 109 110 ASSERT_SEGLOCK(fs); /* XXX it doesn't, really */ 111 112 /* 113 * First, just try a vget. If the version number is the one we want, 114 * we don't have to do anything else. If the version number is wrong, 115 * take appropriate action. 116 */ 117 error = VFS_VGET(fs->lfs_ivnode->v_mount, ino, &vp); 118 if (error == 0) { 119 DLOG((DLOG_RF, "lfs_rf_valloc[1]: ino %d vp %p\n", ino, vp)); 120 121 *vpp = vp; 122 ip = VTOI(vp); 123 if (ip->i_gen == vers) 124 return 0; 125 else if (ip->i_gen < vers) { 126 lfs_truncate(vp, (off_t)0, 0, NOCRED); 127 ip->i_gen = ip->i_ffs1_gen = vers; 128 LFS_SET_UINO(ip, IN_CHANGE | IN_UPDATE); 129 return 0; 130 } else { 131 DLOG((DLOG_RF, "ino %d: sought version %d, got %d\n", 132 ino, vers, ip->i_ffs1_gen)); 133 vput(vp); 134 *vpp = NULLVP; 135 return EEXIST; 136 } 137 } 138 139 /* Not found, create as regular file. */ 140 vattr_null(&va); 141 va.va_type = VREG; 142 va.va_mode = 0; 143 va.va_fileid = ino; 144 va.va_gen = vers; 145 error = vcache_new(fs->lfs_ivnode->v_mount, NULL, &va, NOCRED, &vp); 146 if (error) 147 return error; 148 error = vn_lock(vp, LK_EXCLUSIVE); 149 if (error) { 150 vrele(vp); 151 *vpp = NULLVP; 152 return error; 153 } 154 ip = VTOI(vp); 155 ip->i_nlink = ip->i_ffs1_nlink = 1; 156 *vpp = vp; 157 return 0; 158 } 159 160 /* 161 * Load the appropriate indirect block, and change the appropriate pointer. 162 * Mark the block dirty. Do segment and avail accounting. 163 */ 164 static int 165 update_meta(struct lfs *fs, ino_t ino, int vers, daddr_t lbn, 166 daddr_t ndaddr, size_t size, struct lwp *l) 167 { 168 int error; 169 struct vnode *vp; 170 struct inode *ip; 171 #ifdef DEBUG 172 daddr_t odaddr; 173 struct indir a[ULFS_NIADDR]; 174 int num; 175 int i; 176 #endif /* DEBUG */ 177 struct buf *bp; 178 SEGUSE *sup; 179 180 KASSERT(lbn >= 0); /* no indirect blocks */ 181 182 if ((error = lfs_rf_valloc(fs, ino, vers, l, &vp)) != 0) { 183 DLOG((DLOG_RF, "update_meta: ino %d: lfs_rf_valloc" 184 " returned %d\n", ino, error)); 185 return error; 186 } 187 188 if ((error = lfs_balloc(vp, (lbn << lfs_sb_getbshift(fs)), size, 189 NOCRED, 0, &bp)) != 0) { 190 vput(vp); 191 return (error); 192 } 193 /* No need to write, the block is already on disk */ 194 if (bp->b_oflags & BO_DELWRI) { 195 LFS_UNLOCK_BUF(bp); 196 lfs_sb_addavail(fs, lfs_btofsb(fs, bp->b_bcount)); 197 /* XXX should this wake up fs->lfs_availsleep? */ 198 } 199 brelse(bp, BC_INVAL); 200 201 /* 202 * Extend the file, if it is not large enough already. 203 * XXX this is not exactly right, we don't know how much of the 204 * XXX last block is actually used. We hope that an inode will 205 * XXX appear later to give the correct size. 206 */ 207 ip = VTOI(vp); 208 if (ip->i_size <= (lbn << lfs_sb_getbshift(fs))) { 209 u_int64_t newsize; 210 211 if (lbn < ULFS_NDADDR) 212 newsize = ip->i_ffs1_size = (lbn << lfs_sb_getbshift(fs)) + 213 (size - lfs_sb_getfsize(fs)) + 1; 214 else 215 newsize = ip->i_ffs1_size = (lbn << lfs_sb_getbshift(fs)) + 1; 216 217 if (ip->i_size < newsize) { 218 ip->i_size = newsize; 219 /* 220 * tell vm our new size for the case the inode won't 221 * appear later. 222 */ 223 uvm_vnp_setsize(vp, newsize); 224 } 225 } 226 227 lfs_update_single(fs, NULL, vp, lbn, ndaddr, size); 228 229 LFS_SEGENTRY(sup, fs, lfs_dtosn(fs, ndaddr), bp); 230 sup->su_nbytes += size; 231 LFS_WRITESEGENTRY(sup, fs, lfs_dtosn(fs, ndaddr), bp); 232 233 /* differences here should be due to UNWRITTEN indirect blocks. */ 234 KASSERT((lfs_lblkno(fs, ip->i_size) > ULFS_NDADDR && 235 ip->i_lfs_effnblks == ip->i_ffs1_blocks) || 236 ip->i_lfs_effnblks >= ip->i_ffs1_blocks); 237 238 #ifdef DEBUG 239 /* Now look again to make sure it worked */ 240 ulfs_bmaparray(vp, lbn, &odaddr, &a[0], &num, NULL, NULL); 241 for (i = num; i > 0; i--) { 242 if (!a[i].in_exists) 243 panic("update_meta: absent %d lv indirect block", i); 244 } 245 if (LFS_DBTOFSB(fs, odaddr) != ndaddr) 246 DLOG((DLOG_RF, "update_meta: failed setting ino %d lbn %" 247 PRId64 " to %" PRId64 "\n", ino, lbn, ndaddr)); 248 #endif /* DEBUG */ 249 vput(vp); 250 return 0; 251 } 252 253 /* 254 * Copy some the fields of the dinode as needed by update_inoblk(). 255 */ 256 static void 257 update_inoblk_copy_dinode(struct lfs *fs, 258 union lfs_dinode *dstu, const union lfs_dinode *srcu) 259 { 260 if (fs->lfs_is64) { 261 struct lfs64_dinode *dst = &dstu->u_64; 262 const struct lfs64_dinode *src = &srcu->u_64; 263 unsigned i; 264 265 /* 266 * Copy everything but the block pointers and di_blocks. 267 * XXX what about di_extb? 268 */ 269 dst->di_mode = src->di_mode; 270 dst->di_nlink = src->di_nlink; 271 dst->di_uid = src->di_uid; 272 dst->di_gid = src->di_gid; 273 dst->di_blksize = src->di_blksize; 274 dst->di_size = src->di_size; 275 dst->di_atime = src->di_atime; 276 dst->di_mtime = src->di_mtime; 277 dst->di_ctime = src->di_ctime; 278 dst->di_birthtime = src->di_birthtime; 279 dst->di_mtimensec = src->di_mtimensec; 280 dst->di_atimensec = src->di_atimensec; 281 dst->di_ctimensec = src->di_ctimensec; 282 dst->di_birthnsec = src->di_birthnsec; 283 dst->di_gen = src->di_gen; 284 dst->di_kernflags = src->di_kernflags; 285 dst->di_flags = src->di_flags; 286 dst->di_extsize = src->di_extsize; 287 dst->di_modrev = src->di_modrev; 288 dst->di_inumber = src->di_inumber; 289 for (i = 0; i < __arraycount(src->di_spare); i++) { 290 dst->di_spare[i] = src->di_spare[i]; 291 } 292 } else { 293 struct lfs32_dinode *dst = &dstu->u_32; 294 const struct lfs32_dinode *src = &srcu->u_32; 295 296 /* Get mode, link count, size, and times */ 297 memcpy(dst, src, offsetof(struct lfs32_dinode, di_db[0])); 298 299 /* Then the rest, except di_blocks */ 300 dst->di_flags = src->di_flags; 301 dst->di_gen = src->di_gen; 302 dst->di_uid = src->di_uid; 303 dst->di_gid = src->di_gid; 304 dst->di_modrev = src->di_modrev; 305 } 306 } 307 308 static int 309 update_inoblk(struct lfs *fs, daddr_t offset, kauth_cred_t cred, 310 struct lwp *l) 311 { 312 struct vnode *devvp, *vp; 313 struct inode *ip; 314 union lfs_dinode *dip; 315 struct buf *dbp, *ibp; 316 int error; 317 daddr_t daddr; 318 IFILE *ifp; 319 SEGUSE *sup; 320 unsigned i, num; 321 322 devvp = VTOI(fs->lfs_ivnode)->i_devvp; 323 324 /* 325 * Get the inode, update times and perms. 326 * DO NOT update disk blocks, we do that separately. 327 */ 328 error = bread(devvp, LFS_FSBTODB(fs, offset), lfs_sb_getibsize(fs), 329 0, &dbp); 330 if (error) { 331 DLOG((DLOG_RF, "update_inoblk: bread returned %d\n", error)); 332 return error; 333 } 334 num = LFS_INOPB(fs); 335 for (i = num; i-- > 0; ) { 336 dip = DINO_IN_BLOCK(fs, dbp->b_data, i); 337 if (lfs_dino_getinumber(fs, dip) > LFS_IFILE_INUM) { 338 error = lfs_rf_valloc(fs, lfs_dino_getinumber(fs, dip), 339 lfs_dino_getgen(fs, dip), 340 l, &vp); 341 if (error) { 342 DLOG((DLOG_RF, "update_inoblk: lfs_rf_valloc" 343 " returned %d\n", error)); 344 continue; 345 } 346 ip = VTOI(vp); 347 if (lfs_dino_getsize(fs, dip) != ip->i_size) 348 lfs_truncate(vp, lfs_dino_getsize(fs, dip), 0, 349 NOCRED); 350 update_inoblk_copy_dinode(fs, ip->i_din, dip); 351 352 ip->i_flags = lfs_dino_getflags(fs, dip); 353 ip->i_gen = lfs_dino_getgen(fs, dip); 354 ip->i_uid = lfs_dino_getuid(fs, dip); 355 ip->i_gid = lfs_dino_getgid(fs, dip); 356 357 ip->i_mode = lfs_dino_getmode(fs, dip); 358 ip->i_nlink = lfs_dino_getnlink(fs, dip); 359 ip->i_size = lfs_dino_getsize(fs, dip); 360 361 LFS_SET_UINO(ip, IN_CHANGE | IN_UPDATE); 362 363 /* Re-initialize to get type right */ 364 ulfs_vinit(vp->v_mount, lfs_specop_p, lfs_fifoop_p, 365 &vp); 366 vput(vp); 367 368 /* Record change in location */ 369 LFS_IENTRY(ifp, fs, lfs_dino_getinumber(fs, dip), ibp); 370 daddr = lfs_if_getdaddr(fs, ifp); 371 lfs_if_setdaddr(fs, ifp, LFS_DBTOFSB(fs, dbp->b_blkno)); 372 error = LFS_BWRITE_LOG(ibp); /* Ifile */ 373 /* And do segment accounting */ 374 if (lfs_dtosn(fs, daddr) != lfs_dtosn(fs, LFS_DBTOFSB(fs, dbp->b_blkno))) { 375 if (daddr > 0) { 376 LFS_SEGENTRY(sup, fs, lfs_dtosn(fs, daddr), 377 ibp); 378 sup->su_nbytes -= DINOSIZE(fs); 379 LFS_WRITESEGENTRY(sup, fs, 380 lfs_dtosn(fs, daddr), 381 ibp); 382 } 383 LFS_SEGENTRY(sup, fs, lfs_dtosn(fs, LFS_DBTOFSB(fs, dbp->b_blkno)), 384 ibp); 385 sup->su_nbytes += DINOSIZE(fs); 386 LFS_WRITESEGENTRY(sup, fs, 387 lfs_dtosn(fs, LFS_DBTOFSB(fs, dbp->b_blkno)), 388 ibp); 389 } 390 } 391 } 392 brelse(dbp, BC_AGE); 393 394 return 0; 395 } 396 397 #define CHECK_CKSUM 0x0001 /* Check the checksum to make sure it's valid */ 398 #define CHECK_UPDATE 0x0002 /* Update Ifile for new data blocks / inodes */ 399 400 static daddr_t 401 check_segsum(struct lfs *fs, daddr_t offset, u_int64_t nextserial, 402 kauth_cred_t cred, int flags, int *pseg_flags, struct lwp *l) 403 { 404 struct vnode *devvp; 405 struct buf *bp, *dbp; 406 int error, nblocks = 0, ninos, i, j; /* XXX: gcc */ 407 SEGSUM *ssp; 408 u_long *dp = NULL, *datap = NULL; /* XXX u_int32_t */ 409 daddr_t oldoffset; 410 int32_t *iaddr; /* XXX ondisk32 */ 411 FINFO *fip; 412 SEGUSE *sup; 413 size_t size; 414 uint32_t datasum, foundsum; 415 416 devvp = VTOI(fs->lfs_ivnode)->i_devvp; 417 /* 418 * If the segment has a superblock and we're at the top 419 * of the segment, skip the superblock. 420 */ 421 if (lfs_sntod(fs, lfs_dtosn(fs, offset)) == offset) { 422 LFS_SEGENTRY(sup, fs, lfs_dtosn(fs, offset), bp); 423 if (sup->su_flags & SEGUSE_SUPERBLOCK) 424 offset += lfs_btofsb(fs, LFS_SBPAD); 425 brelse(bp, 0); 426 } 427 428 /* Read in the segment summary */ 429 error = bread(devvp, LFS_FSBTODB(fs, offset), lfs_sb_getsumsize(fs), 430 0, &bp); 431 if (error) 432 return -1; 433 434 /* Check summary checksum */ 435 ssp = (SEGSUM *)bp->b_data; 436 if (flags & CHECK_CKSUM) { 437 size_t sumstart; 438 439 sumstart = lfs_ss_getsumstart(fs); 440 if (lfs_ss_getsumsum(fs, ssp) != 441 cksum((char *)ssp + sumstart, 442 lfs_sb_getsumsize(fs) - sumstart)) { 443 DLOG((DLOG_RF, "Sumsum error at 0x%" PRIx64 "\n", offset)); 444 offset = -1; 445 goto err1; 446 } 447 if (lfs_ss_getnfinfo(fs, ssp) == 0 && 448 lfs_ss_getninos(fs, ssp) == 0) { 449 DLOG((DLOG_RF, "Empty pseg at 0x%" PRIx64 "\n", offset)); 450 offset = -1; 451 goto err1; 452 } 453 if (lfs_ss_getcreate(fs, ssp) < lfs_sb_gettstamp(fs)) { 454 DLOG((DLOG_RF, "Old data at 0x%" PRIx64 "\n", offset)); 455 offset = -1; 456 goto err1; 457 } 458 } 459 if (lfs_sb_getversion(fs) > 1) { 460 if (lfs_ss_getserial(fs, ssp) != nextserial) { 461 DLOG((DLOG_RF, "Unexpected serial number at 0x%" PRIx64 462 "\n", offset)); 463 offset = -1; 464 goto err1; 465 } 466 if (lfs_ss_getident(fs, ssp) != lfs_sb_getident(fs)) { 467 DLOG((DLOG_RF, "Incorrect fsid (0x%x vs 0x%x) at 0x%" 468 PRIx64 "\n", lfs_ss_getident(fs, ssp), 469 lfs_sb_getident(fs), offset)); 470 offset = -1; 471 goto err1; 472 } 473 } 474 if (pseg_flags) 475 *pseg_flags = lfs_ss_getflags(fs, ssp); 476 oldoffset = offset; 477 offset += lfs_btofsb(fs, lfs_sb_getsumsize(fs)); 478 479 ninos = howmany(lfs_ss_getninos(fs, ssp), LFS_INOPB(fs)); 480 /* XXX ondisk32 */ 481 iaddr = (int32_t *)((char*)bp->b_data + lfs_sb_getsumsize(fs) - sizeof(int32_t)); 482 if (flags & CHECK_CKSUM) { 483 /* Count blocks */ 484 nblocks = 0; 485 fip = SEGSUM_FINFOBASE(fs, (SEGSUM *)bp->b_data); 486 for (i = 0; i < lfs_ss_getnfinfo(fs, ssp); ++i) { 487 nblocks += lfs_fi_getnblocks(fs, fip); 488 if (lfs_fi_getnblocks(fs, fip) <= 0) 489 break; 490 fip = NEXT_FINFO(fs, fip); 491 } 492 nblocks += ninos; 493 /* Create the sum array */ 494 datap = dp = malloc(nblocks * sizeof(u_long), 495 M_SEGMENT, M_WAITOK); 496 } 497 498 /* Handle individual blocks */ 499 fip = SEGSUM_FINFOBASE(fs, (SEGSUM *)bp->b_data); 500 for (i = 0; i < lfs_ss_getnfinfo(fs, ssp) || ninos; ++i) { 501 /* Inode block? */ 502 if (ninos && *iaddr == offset) { 503 if (flags & CHECK_CKSUM) { 504 /* Read in the head and add to the buffer */ 505 error = bread(devvp, LFS_FSBTODB(fs, offset), lfs_sb_getbsize(fs), 506 0, &dbp); 507 if (error) { 508 offset = -1; 509 goto err2; 510 } 511 /* XXX this can't be right, on-disk u_long? */ 512 (*dp++) = ((u_long *)(dbp->b_data))[0]; 513 brelse(dbp, BC_AGE); 514 } 515 if (flags & CHECK_UPDATE) { 516 if ((error = update_inoblk(fs, offset, cred, l)) 517 != 0) { 518 offset = -1; 519 goto err2; 520 } 521 } 522 offset += lfs_btofsb(fs, lfs_sb_getibsize(fs)); 523 --iaddr; 524 --ninos; 525 --i; /* compensate */ 526 continue; 527 } 528 size = lfs_sb_getbsize(fs); 529 for (j = 0; j < lfs_fi_getnblocks(fs, fip); ++j) { 530 if (j == lfs_fi_getnblocks(fs, fip) - 1) 531 size = lfs_fi_getlastlength(fs, fip); 532 if (flags & CHECK_CKSUM) { 533 error = bread(devvp, LFS_FSBTODB(fs, offset), size, 534 0, &dbp); 535 if (error) { 536 offset = -1; 537 goto err2; 538 } 539 (*dp++) = ((u_long *)(dbp->b_data))[0]; 540 brelse(dbp, BC_AGE); 541 } 542 /* Account for and update any direct blocks */ 543 if ((flags & CHECK_UPDATE) && 544 lfs_fi_getino(fs, fip) > LFS_IFILE_INUM && 545 lfs_fi_getblock(fs, fip, j) >= 0) { 546 update_meta(fs, lfs_fi_getino(fs, fip), 547 lfs_fi_getversion(fs, fip), 548 lfs_fi_getblock(fs, fip, j), 549 offset, size, l); 550 } 551 offset += lfs_btofsb(fs, size); 552 } 553 fip = NEXT_FINFO(fs, fip); 554 } 555 /* Checksum the array, compare */ 556 datasum = lfs_ss_getdatasum(fs, ssp); 557 foundsum = cksum(datap, nblocks * sizeof(u_long)); 558 if ((flags & CHECK_CKSUM) && datasum != foundsum) { 559 DLOG((DLOG_RF, "Datasum error at 0x%" PRIx64 560 " (wanted %x got %x)\n", 561 offset, datasum, foundsum)); 562 offset = -1; 563 goto err2; 564 } 565 566 /* If we're at the end of the segment, move to the next */ 567 if (lfs_dtosn(fs, offset + lfs_btofsb(fs, lfs_sb_getsumsize(fs) + lfs_sb_getbsize(fs))) != 568 lfs_dtosn(fs, offset)) { 569 if (lfs_dtosn(fs, offset) == lfs_dtosn(fs, lfs_ss_getnext(fs, ssp))) { 570 offset = -1; 571 goto err2; 572 } 573 offset = lfs_ss_getnext(fs, ssp); 574 DLOG((DLOG_RF, "LFS roll forward: moving to offset 0x%" PRIx64 575 " -> segment %d\n", offset, lfs_dtosn(fs,offset))); 576 } 577 578 if (flags & CHECK_UPDATE) { 579 lfs_sb_subavail(fs, offset - oldoffset); 580 /* Don't clog the buffer queue */ 581 mutex_enter(&lfs_lock); 582 if (locked_queue_count > LFS_MAX_BUFS || 583 locked_queue_bytes > LFS_MAX_BYTES) { 584 lfs_flush(fs, SEGM_CKP, 0); 585 } 586 mutex_exit(&lfs_lock); 587 } 588 589 err2: 590 if (flags & CHECK_CKSUM) 591 free(datap, M_SEGMENT); 592 err1: 593 brelse(bp, BC_AGE); 594 595 /* XXX should we update the serial number even for bad psegs? */ 596 if ((flags & CHECK_UPDATE) && offset > 0 && lfs_sb_getversion(fs) > 1) 597 lfs_sb_setserial(fs, nextserial); 598 return offset; 599 } 600 601 void 602 lfs_roll_forward(struct lfs *fs, struct mount *mp, struct lwp *l) 603 { 604 int flags, dirty; 605 daddr_t offset, oldoffset, lastgoodpseg; 606 int sn, curseg, do_rollforward; 607 struct proc *p; 608 kauth_cred_t cred; 609 SEGUSE *sup; 610 struct buf *bp; 611 612 p = l ? l->l_proc : NULL; 613 cred = p ? p->p_cred : NOCRED; 614 615 /* 616 * Roll forward. 617 * 618 * We don't roll forward for v1 filesystems, because 619 * of the danger that the clock was turned back between the last 620 * checkpoint and crash. This would roll forward garbage. 621 * 622 * v2 filesystems don't have this problem because they use a 623 * monotonically increasing serial number instead of a timestamp. 624 */ 625 do_rollforward = (!(lfs_sb_getpflags(fs) & LFS_PF_CLEAN) && 626 lfs_do_rfw && lfs_sb_getversion(fs) > 1 && p != NULL); 627 if (do_rollforward) { 628 u_int64_t nextserial; 629 /* 630 * Phase I: Find the address of the last good partial 631 * segment that was written after the checkpoint. Mark 632 * the segments in question dirty, so they won't be 633 * reallocated. 634 */ 635 lastgoodpseg = oldoffset = offset = lfs_sb_getoffset(fs); 636 flags = 0x0; 637 DLOG((DLOG_RF, "LFS roll forward phase 1: start at offset 0x%" 638 PRIx64 "\n", offset)); 639 LFS_SEGENTRY(sup, fs, lfs_dtosn(fs, offset), bp); 640 if (!(sup->su_flags & SEGUSE_DIRTY)) 641 lfs_sb_subnclean(fs, 1); 642 sup->su_flags |= SEGUSE_DIRTY; 643 LFS_WRITESEGENTRY(sup, fs, lfs_dtosn(fs, offset), bp); 644 nextserial = lfs_sb_getserial(fs) + 1; 645 while ((offset = check_segsum(fs, offset, nextserial, 646 cred, CHECK_CKSUM, &flags, l)) > 0) { 647 nextserial++; 648 if (lfs_sntod(fs, oldoffset) != lfs_sntod(fs, offset)) { 649 LFS_SEGENTRY(sup, fs, lfs_dtosn(fs, oldoffset), 650 bp); 651 if (!(sup->su_flags & SEGUSE_DIRTY)) 652 lfs_sb_subnclean(fs, 1); 653 sup->su_flags |= SEGUSE_DIRTY; 654 LFS_WRITESEGENTRY(sup, fs, lfs_dtosn(fs, oldoffset), 655 bp); 656 } 657 658 DLOG((DLOG_RF, "LFS roll forward phase 1: offset=0x%" 659 PRIx64 "\n", offset)); 660 if (flags & SS_DIROP) { 661 DLOG((DLOG_RF, "lfs_mountfs: dirops at 0x%" 662 PRIx64 "\n", oldoffset)); 663 if (!(flags & SS_CONT)) { 664 DLOG((DLOG_RF, "lfs_mountfs: dirops end " 665 "at 0x%" PRIx64 "\n", oldoffset)); 666 } 667 } 668 if (!(flags & SS_CONT)) 669 lastgoodpseg = offset; 670 oldoffset = offset; 671 } 672 if (flags & SS_CONT) { 673 DLOG((DLOG_RF, "LFS roll forward: warning: incomplete " 674 "dirops discarded\n")); 675 } 676 DLOG((DLOG_RF, "LFS roll forward phase 1: completed: " 677 "lastgoodpseg=0x%" PRIx64 "\n", lastgoodpseg)); 678 oldoffset = lfs_sb_getoffset(fs); 679 if (lfs_sb_getoffset(fs) != lastgoodpseg) { 680 /* Don't overwrite what we're trying to preserve */ 681 offset = lfs_sb_getoffset(fs); 682 lfs_sb_setoffset(fs, lastgoodpseg); 683 lfs_sb_setcurseg(fs, lfs_sntod(fs, lfs_dtosn(fs, lfs_sb_getoffset(fs)))); 684 for (sn = curseg = lfs_dtosn(fs, lfs_sb_getcurseg(fs));;) { 685 sn = (sn + 1) % lfs_sb_getnseg(fs); 686 if (sn == curseg) 687 panic("lfs_mountfs: no clean segments"); 688 LFS_SEGENTRY(sup, fs, sn, bp); 689 dirty = (sup->su_flags & SEGUSE_DIRTY); 690 brelse(bp, 0); 691 if (!dirty) 692 break; 693 } 694 lfs_sb_setnextseg(fs, lfs_sntod(fs, sn)); 695 696 /* 697 * Phase II: Roll forward from the first superblock. 698 */ 699 while (offset != lastgoodpseg) { 700 DLOG((DLOG_RF, "LFS roll forward phase 2: 0x%" 701 PRIx64 "\n", offset)); 702 offset = check_segsum(fs, offset, 703 lfs_sb_getserial(fs) + 1, cred, CHECK_UPDATE, 704 NULL, l); 705 } 706 707 /* 708 * Finish: flush our changes to disk. 709 */ 710 lfs_segwrite(mp, SEGM_CKP | SEGM_SYNC); 711 DLOG((DLOG_RF, "lfs_mountfs: roll forward ", 712 "recovered %jd blocks\n", 713 (intmax_t)(lastgoodpseg - oldoffset))); 714 } 715 DLOG((DLOG_RF, "LFS roll forward complete\n")); 716 } 717 } 718
Indexes created Tue Sep 30 20:09:53 GMT 2025