1 /* $NetBSD: lfs_vfsops.c,v 1.278 2009/09/13 05:17:37 tsutsui Exp $ */ 2 3 /*- 4 * Copyright (c) 1999, 2000, 2001, 2002, 2003, 2007, 2007 5 * The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Konrad E. Schroder <perseant@hhhh.org>. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 /*- 33 * Copyright (c) 1989, 1991, 1993, 1994 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)lfs_vfsops.c 8.20 (Berkeley) 6/10/95 61 */ 62 63 #include <sys/cdefs.h> 64 __KERNEL_RCSID(0, "$NetBSD: lfs_vfsops.c,v 1.278 2009/09/13 05:17:37 tsutsui Exp $"); 65 66 #if defined(_KERNEL_OPT) 67 #include "opt_lfs.h" 68 #include "opt_quota.h" 69 #endif 70 71 #include <sys/param.h> 72 #include <sys/systm.h> 73 #include <sys/namei.h> 74 #include <sys/proc.h> 75 #include <sys/kernel.h> 76 #include <sys/vnode.h> 77 #include <sys/mount.h> 78 #include <sys/kthread.h> 79 #include <sys/buf.h> 80 #include <sys/device.h> 81 #include <sys/mbuf.h> 82 #include <sys/file.h> 83 #include <sys/disklabel.h> 84 #include <sys/ioctl.h> 85 #include <sys/errno.h> 86 #include <sys/malloc.h> 87 #include <sys/pool.h> 88 #include <sys/socket.h> 89 #include <sys/syslog.h> 90 #include <uvm/uvm_extern.h> 91 #include <sys/sysctl.h> 92 #include <sys/conf.h> 93 #include <sys/kauth.h> 94 #include <sys/module.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 <uvm/uvm.h> 104 #include <uvm/uvm_stat.h> 105 #include <uvm/uvm_pager.h> 106 #include <uvm/uvm_pdaemon.h> 107 108 #include <ufs/lfs/lfs.h> 109 #include <ufs/lfs/lfs_extern.h> 110 111 #include <miscfs/genfs/genfs.h> 112 #include <miscfs/genfs/genfs_node.h> 113 114 MODULE(MODULE_CLASS_VFS, lfs, "ffs"); 115 116 static int lfs_gop_write(struct vnode *, struct vm_page **, int, int); 117 static bool lfs_issequential_hole(const struct ufsmount *, 118 daddr_t, daddr_t); 119 120 static int lfs_mountfs(struct vnode *, struct mount *, struct lwp *); 121 122 void lfs_sysctl_setup(struct sysctllog *); 123 static struct sysctllog *lfs_sysctl_log; 124 125 extern const struct vnodeopv_desc lfs_vnodeop_opv_desc; 126 extern const struct vnodeopv_desc lfs_specop_opv_desc; 127 extern const struct vnodeopv_desc lfs_fifoop_opv_desc; 128 129 pid_t lfs_writer_daemon = 0; 130 int lfs_do_flush = 0; 131 #ifdef LFS_KERNEL_RFW 132 int lfs_do_rfw = 0; 133 #endif 134 135 const struct vnodeopv_desc * const lfs_vnodeopv_descs[] = { 136 &lfs_vnodeop_opv_desc, 137 &lfs_specop_opv_desc, 138 &lfs_fifoop_opv_desc, 139 NULL, 140 }; 141 142 struct vfsops lfs_vfsops = { 143 MOUNT_LFS, 144 sizeof (struct ufs_args), 145 lfs_mount, 146 ufs_start, 147 lfs_unmount, 148 ufs_root, 149 ufs_quotactl, 150 lfs_statvfs, 151 lfs_sync, 152 lfs_vget, 153 lfs_fhtovp, 154 lfs_vptofh, 155 lfs_init, 156 lfs_reinit, 157 lfs_done, 158 lfs_mountroot, 159 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 160 vfs_stdextattrctl, 161 (void *)eopnotsupp, /* vfs_suspendctl */ 162 genfs_renamelock_enter, 163 genfs_renamelock_exit, 164 (void *)eopnotsupp, 165 lfs_vnodeopv_descs, 166 0, 167 { NULL, NULL }, 168 }; 169 170 const struct genfs_ops lfs_genfsops = { 171 .gop_size = lfs_gop_size, 172 .gop_alloc = ufs_gop_alloc, 173 .gop_write = lfs_gop_write, 174 .gop_markupdate = ufs_gop_markupdate, 175 }; 176 177 static const struct ufs_ops lfs_ufsops = { 178 .uo_itimes = NULL, 179 .uo_update = lfs_update, 180 .uo_truncate = lfs_truncate, 181 .uo_valloc = lfs_valloc, 182 .uo_vfree = lfs_vfree, 183 .uo_balloc = lfs_balloc, 184 .uo_unmark_vnode = lfs_unmark_vnode, 185 }; 186 187 struct shortlong { 188 const char *sname; 189 const char *lname; 190 }; 191 192 static int 193 sysctl_lfs_dostats(SYSCTLFN_ARGS) 194 { 195 extern struct lfs_stats lfs_stats; 196 extern int lfs_dostats; 197 int error; 198 199 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 200 if (error || newp == NULL) 201 return (error); 202 203 if (lfs_dostats == 0) 204 memset(&lfs_stats, 0, sizeof(lfs_stats)); 205 206 return (0); 207 } 208 209 void 210 lfs_sysctl_setup(struct sysctllog *clog) 211 { 212 int i; 213 extern int lfs_writeindir, lfs_dostats, lfs_clean_vnhead, 214 lfs_fs_pagetrip, lfs_ignore_lazy_sync; 215 #ifdef DEBUG 216 extern int lfs_debug_log_subsys[DLOG_MAX]; 217 struct shortlong dlog_names[DLOG_MAX] = { /* Must match lfs.h ! */ 218 { "rollforward", "Debug roll-forward code" }, 219 { "alloc", "Debug inode allocation and free list" }, 220 { "avail", "Debug space-available-now accounting" }, 221 { "flush", "Debug flush triggers" }, 222 { "lockedlist", "Debug locked list accounting" }, 223 { "vnode_verbose", "Verbose per-vnode-written debugging" }, 224 { "vnode", "Debug vnode use during segment write" }, 225 { "segment", "Debug segment writing" }, 226 { "seguse", "Debug segment used-bytes accounting" }, 227 { "cleaner", "Debug cleaning routines" }, 228 { "mount", "Debug mount/unmount routines" }, 229 { "pagecache", "Debug UBC interactions" }, 230 { "dirop", "Debug directory-operation accounting" }, 231 { "malloc", "Debug private malloc accounting" }, 232 }; 233 #endif /* DEBUG */ 234 struct shortlong stat_names[] = { /* Must match lfs.h! */ 235 { "segsused", "Number of new segments allocated" }, 236 { "psegwrites", "Number of partial-segment writes" }, 237 { "psyncwrites", "Number of synchronous partial-segment" 238 " writes" }, 239 { "pcleanwrites", "Number of partial-segment writes by the" 240 " cleaner" }, 241 { "blocktot", "Number of blocks written" }, 242 { "cleanblocks", "Number of blocks written by the cleaner" }, 243 { "ncheckpoints", "Number of checkpoints made" }, 244 { "nwrites", "Number of whole writes" }, 245 { "nsync_writes", "Number of synchronous writes" }, 246 { "wait_exceeded", "Number of times writer waited for" 247 " cleaner" }, 248 { "write_exceeded", "Number of times writer invoked flush" }, 249 { "flush_invoked", "Number of times flush was invoked" }, 250 { "vflush_invoked", "Number of time vflush was called" }, 251 { "clean_inlocked", "Number of vnodes skipped for VI_XLOCK" }, 252 { "clean_vnlocked", "Number of vnodes skipped for vget failure" }, 253 { "segs_reclaimed", "Number of segments reclaimed" }, 254 }; 255 256 sysctl_createv(&clog, 0, NULL, NULL, 257 CTLFLAG_PERMANENT, 258 CTLTYPE_NODE, "vfs", NULL, 259 NULL, 0, NULL, 0, 260 CTL_VFS, CTL_EOL); 261 sysctl_createv(&clog, 0, NULL, NULL, 262 CTLFLAG_PERMANENT, 263 CTLTYPE_NODE, "lfs", 264 SYSCTL_DESCR("Log-structured file system"), 265 NULL, 0, NULL, 0, 266 CTL_VFS, 5, CTL_EOL); 267 /* 268 * XXX the "5" above could be dynamic, thereby eliminating one 269 * more instance of the "number to vfs" mapping problem, but 270 * "5" is the order as taken from sys/mount.h 271 */ 272 273 sysctl_createv(&clog, 0, NULL, NULL, 274 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 275 CTLTYPE_INT, "flushindir", NULL, 276 NULL, 0, &lfs_writeindir, 0, 277 CTL_VFS, 5, LFS_WRITEINDIR, CTL_EOL); 278 sysctl_createv(&clog, 0, NULL, NULL, 279 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 280 CTLTYPE_INT, "clean_vnhead", NULL, 281 NULL, 0, &lfs_clean_vnhead, 0, 282 CTL_VFS, 5, LFS_CLEAN_VNHEAD, CTL_EOL); 283 sysctl_createv(&clog, 0, NULL, NULL, 284 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 285 CTLTYPE_INT, "dostats", 286 SYSCTL_DESCR("Maintain statistics on LFS operations"), 287 sysctl_lfs_dostats, 0, &lfs_dostats, 0, 288 CTL_VFS, 5, LFS_DOSTATS, CTL_EOL); 289 sysctl_createv(&clog, 0, NULL, NULL, 290 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 291 CTLTYPE_INT, "pagetrip", 292 SYSCTL_DESCR("How many dirty pages in fs triggers" 293 " a flush"), 294 NULL, 0, &lfs_fs_pagetrip, 0, 295 CTL_VFS, 5, LFS_FS_PAGETRIP, CTL_EOL); 296 sysctl_createv(&clog, 0, NULL, NULL, 297 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 298 CTLTYPE_INT, "ignore_lazy_sync", 299 SYSCTL_DESCR("Lazy Sync is ignored entirely"), 300 NULL, 0, &lfs_ignore_lazy_sync, 0, 301 CTL_VFS, 5, LFS_IGNORE_LAZY_SYNC, CTL_EOL); 302 #ifdef LFS_KERNEL_RFW 303 sysctl_createv(&clog, 0, NULL, NULL, 304 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 305 CTLTYPE_INT, "rfw", 306 SYSCTL_DESCR("Use in-kernel roll-forward on mount"), 307 NULL, 0, &lfs_do_rfw, 0, 308 CTL_VFS, 5, LFS_DO_RFW, CTL_EOL); 309 #endif 310 311 sysctl_createv(&clog, 0, NULL, NULL, 312 CTLFLAG_PERMANENT, 313 CTLTYPE_NODE, "stats", 314 SYSCTL_DESCR("Debugging options"), 315 NULL, 0, NULL, 0, 316 CTL_VFS, 5, LFS_STATS, CTL_EOL); 317 for (i = 0; i < sizeof(struct lfs_stats) / sizeof(u_int); i++) { 318 sysctl_createv(&clog, 0, NULL, NULL, 319 CTLFLAG_PERMANENT|CTLFLAG_READONLY, 320 CTLTYPE_INT, stat_names[i].sname, 321 SYSCTL_DESCR(stat_names[i].lname), 322 NULL, 0, &(((u_int *)&lfs_stats.segsused)[i]), 323 0, CTL_VFS, 5, LFS_STATS, i, CTL_EOL); 324 } 325 326 #ifdef DEBUG 327 sysctl_createv(&clog, 0, NULL, NULL, 328 CTLFLAG_PERMANENT, 329 CTLTYPE_NODE, "debug", 330 SYSCTL_DESCR("Debugging options"), 331 NULL, 0, NULL, 0, 332 CTL_VFS, 5, LFS_DEBUGLOG, CTL_EOL); 333 for (i = 0; i < DLOG_MAX; i++) { 334 sysctl_createv(&clog, 0, NULL, NULL, 335 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 336 CTLTYPE_INT, dlog_names[i].sname, 337 SYSCTL_DESCR(dlog_names[i].lname), 338 NULL, 0, &(lfs_debug_log_subsys[i]), 0, 339 CTL_VFS, 5, LFS_DEBUGLOG, i, CTL_EOL); 340 } 341 #endif 342 } 343 344 static int 345 lfs_modcmd(modcmd_t cmd, void *arg) 346 { 347 int error; 348 349 switch (cmd) { 350 case MODULE_CMD_INIT: 351 error = vfs_attach(&lfs_vfsops); 352 if (error != 0) 353 break; 354 lfs_sysctl_setup(lfs_sysctl_log); 355 break; 356 case MODULE_CMD_FINI: 357 error = vfs_detach(&lfs_vfsops); 358 if (error != 0) 359 break; 360 sysctl_teardown(&lfs_sysctl_log); 361 break; 362 default: 363 error = ENOTTY; 364 break; 365 } 366 367 return (error); 368 } 369 370 /* 371 * XXX Same structure as FFS inodes? Should we share a common pool? 372 */ 373 struct pool lfs_inode_pool; 374 struct pool lfs_dinode_pool; 375 struct pool lfs_inoext_pool; 376 struct pool lfs_lbnentry_pool; 377 378 /* 379 * The writer daemon. UVM keeps track of how many dirty pages we are holding 380 * in lfs_subsys_pages; the daemon flushes the filesystem when this value 381 * crosses the (user-defined) threshhold LFS_MAX_PAGES. 382 */ 383 static void 384 lfs_writerd(void *arg) 385 { 386 struct mount *mp, *nmp; 387 struct lfs *fs; 388 int fsflags; 389 int loopcount; 390 391 lfs_writer_daemon = curproc->p_pid; 392 393 mutex_enter(&lfs_lock); 394 for (;;) { 395 mtsleep(&lfs_writer_daemon, PVM | PNORELOCK, "lfswriter", hz/10, 396 &lfs_lock); 397 398 /* 399 * Look through the list of LFSs to see if any of them 400 * have requested pageouts. 401 */ 402 mutex_enter(&mountlist_lock); 403 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 404 mp = nmp) { 405 if (vfs_busy(mp, &nmp)) { 406 continue; 407 } 408 if (strncmp(mp->mnt_stat.f_fstypename, MOUNT_LFS, 409 sizeof(mp->mnt_stat.f_fstypename)) == 0) { 410 fs = VFSTOUFS(mp)->um_lfs; 411 mutex_enter(&lfs_lock); 412 fsflags = 0; 413 if ((fs->lfs_dirvcount > LFS_MAX_FSDIROP(fs) || 414 lfs_dirvcount > LFS_MAX_DIROP) && 415 fs->lfs_dirops == 0) 416 fsflags |= SEGM_CKP; 417 if (fs->lfs_pdflush) { 418 DLOG((DLOG_FLUSH, "lfs_writerd: pdflush set\n")); 419 fs->lfs_pdflush = 0; 420 lfs_flush_fs(fs, fsflags); 421 mutex_exit(&lfs_lock); 422 } else if (!TAILQ_EMPTY(&fs->lfs_pchainhd)) { 423 DLOG((DLOG_FLUSH, "lfs_writerd: pchain non-empty\n")); 424 mutex_exit(&lfs_lock); 425 lfs_writer_enter(fs, "wrdirop"); 426 lfs_flush_pchain(fs); 427 lfs_writer_leave(fs); 428 } else 429 mutex_exit(&lfs_lock); 430 } 431 vfs_unbusy(mp, false, &nmp); 432 } 433 mutex_exit(&mountlist_lock); 434 435 /* 436 * If global state wants a flush, flush everything. 437 */ 438 mutex_enter(&lfs_lock); 439 loopcount = 0; 440 if (lfs_do_flush || locked_queue_count > LFS_MAX_BUFS || 441 locked_queue_bytes > LFS_MAX_BYTES || 442 lfs_subsys_pages > LFS_MAX_PAGES) { 443 444 if (lfs_do_flush) { 445 DLOG((DLOG_FLUSH, "daemon: lfs_do_flush\n")); 446 } 447 if (locked_queue_count > LFS_MAX_BUFS) { 448 DLOG((DLOG_FLUSH, "daemon: lqc = %d, max %d\n", 449 locked_queue_count, LFS_MAX_BUFS)); 450 } 451 if (locked_queue_bytes > LFS_MAX_BYTES) { 452 DLOG((DLOG_FLUSH, "daemon: lqb = %ld, max %ld\n", 453 locked_queue_bytes, LFS_MAX_BYTES)); 454 } 455 if (lfs_subsys_pages > LFS_MAX_PAGES) { 456 DLOG((DLOG_FLUSH, "daemon: lssp = %d, max %d\n", 457 lfs_subsys_pages, LFS_MAX_PAGES)); 458 } 459 460 lfs_flush(NULL, SEGM_WRITERD, 0); 461 lfs_do_flush = 0; 462 } 463 } 464 /* NOTREACHED */ 465 } 466 467 /* 468 * Initialize the filesystem, most work done by ufs_init. 469 */ 470 void 471 lfs_init(void) 472 { 473 474 malloc_type_attach(M_SEGMENT); 475 pool_init(&lfs_inode_pool, sizeof(struct inode), 0, 0, 0, 476 "lfsinopl", &pool_allocator_nointr, IPL_NONE); 477 pool_init(&lfs_dinode_pool, sizeof(struct ufs1_dinode), 0, 0, 0, 478 "lfsdinopl", &pool_allocator_nointr, IPL_NONE); 479 pool_init(&lfs_inoext_pool, sizeof(struct lfs_inode_ext), 8, 0, 0, 480 "lfsinoextpl", &pool_allocator_nointr, IPL_NONE); 481 pool_init(&lfs_lbnentry_pool, sizeof(struct lbnentry), 0, 0, 0, 482 "lfslbnpool", &pool_allocator_nointr, IPL_NONE); 483 ufs_init(); 484 485 #ifdef DEBUG 486 memset(lfs_log, 0, sizeof(lfs_log)); 487 #endif 488 mutex_init(&lfs_lock, MUTEX_DEFAULT, IPL_NONE); 489 cv_init(&locked_queue_cv, "lfsbuf"); 490 cv_init(&lfs_writing_cv, "lfsflush"); 491 } 492 493 void 494 lfs_reinit(void) 495 { 496 ufs_reinit(); 497 } 498 499 void 500 lfs_done(void) 501 { 502 ufs_done(); 503 mutex_destroy(&lfs_lock); 504 cv_destroy(&locked_queue_cv); 505 cv_destroy(&lfs_writing_cv); 506 pool_destroy(&lfs_inode_pool); 507 pool_destroy(&lfs_dinode_pool); 508 pool_destroy(&lfs_inoext_pool); 509 pool_destroy(&lfs_lbnentry_pool); 510 malloc_type_detach(M_SEGMENT); 511 } 512 513 /* 514 * Called by main() when ufs is going to be mounted as root. 515 */ 516 int 517 lfs_mountroot(void) 518 { 519 extern struct vnode *rootvp; 520 struct mount *mp; 521 struct lwp *l = curlwp; 522 int error; 523 524 if (device_class(root_device) != DV_DISK) 525 return (ENODEV); 526 527 if (rootdev == NODEV) 528 return (ENODEV); 529 if ((error = vfs_rootmountalloc(MOUNT_LFS, "root_device", &mp))) { 530 vrele(rootvp); 531 return (error); 532 } 533 if ((error = lfs_mountfs(rootvp, mp, l))) { 534 vfs_unbusy(mp, false, NULL); 535 vfs_destroy(mp); 536 return (error); 537 } 538 mutex_enter(&mountlist_lock); 539 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 540 mutex_exit(&mountlist_lock); 541 (void)lfs_statvfs(mp, &mp->mnt_stat); 542 vfs_unbusy(mp, false, NULL); 543 setrootfstime((time_t)(VFSTOUFS(mp)->um_lfs->lfs_tstamp)); 544 return (0); 545 } 546 547 /* 548 * VFS Operations. 549 * 550 * mount system call 551 */ 552 int 553 lfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 554 { 555 struct lwp *l = curlwp; 556 struct vnode *devvp; 557 struct ufs_args *args = data; 558 struct ufsmount *ump = NULL; 559 struct lfs *fs = NULL; /* LFS */ 560 int error = 0, update; 561 mode_t accessmode; 562 563 if (*data_len < sizeof *args) 564 return EINVAL; 565 566 if (mp->mnt_flag & MNT_GETARGS) { 567 ump = VFSTOUFS(mp); 568 if (ump == NULL) 569 return EIO; 570 args->fspec = NULL; 571 *data_len = sizeof *args; 572 return 0; 573 } 574 575 update = mp->mnt_flag & MNT_UPDATE; 576 577 /* Check arguments */ 578 if (args->fspec != NULL) { 579 /* 580 * Look up the name and verify that it's sane. 581 */ 582 error = namei_simple_user(args->fspec, 583 NSM_FOLLOW_NOEMULROOT, &devvp); 584 if (error != 0) 585 return (error); 586 587 if (!update) { 588 /* 589 * Be sure this is a valid block device 590 */ 591 if (devvp->v_type != VBLK) 592 error = ENOTBLK; 593 else if (bdevsw_lookup(devvp->v_rdev) == NULL) 594 error = ENXIO; 595 } else { 596 /* 597 * Be sure we're still naming the same device 598 * used for our initial mount 599 */ 600 ump = VFSTOUFS(mp); 601 if (devvp != ump->um_devvp) 602 error = EINVAL; 603 } 604 } else { 605 if (!update) { 606 /* New mounts must have a filename for the device */ 607 return (EINVAL); 608 } else { 609 /* Use the extant mount */ 610 ump = VFSTOUFS(mp); 611 devvp = ump->um_devvp; 612 vref(devvp); 613 } 614 } 615 616 617 /* 618 * If mount by non-root, then verify that user has necessary 619 * permissions on the device. 620 */ 621 if (error == 0) { 622 accessmode = VREAD; 623 if (update ? 624 (mp->mnt_iflag & IMNT_WANTRDWR) != 0 : 625 (mp->mnt_flag & MNT_RDONLY) == 0) 626 accessmode |= VWRITE; 627 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 628 error = genfs_can_mount(devvp, accessmode, l->l_cred); 629 VOP_UNLOCK(devvp, 0); 630 } 631 632 if (error) { 633 vrele(devvp); 634 return (error); 635 } 636 637 if (!update) { 638 int flags; 639 640 if (mp->mnt_flag & MNT_RDONLY) 641 flags = FREAD; 642 else 643 flags = FREAD|FWRITE; 644 error = VOP_OPEN(devvp, flags, FSCRED); 645 if (error) 646 goto fail; 647 error = lfs_mountfs(devvp, mp, l); /* LFS */ 648 if (error) { 649 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 650 (void)VOP_CLOSE(devvp, flags, NOCRED); 651 VOP_UNLOCK(devvp, 0); 652 goto fail; 653 } 654 655 ump = VFSTOUFS(mp); 656 fs = ump->um_lfs; 657 } else { 658 /* 659 * Update the mount. 660 */ 661 662 /* 663 * The initial mount got a reference on this 664 * device, so drop the one obtained via 665 * namei(), above. 666 */ 667 vrele(devvp); 668 669 ump = VFSTOUFS(mp); 670 fs = ump->um_lfs; 671 if (fs->lfs_ronly && (mp->mnt_iflag & IMNT_WANTRDWR)) { 672 /* 673 * Changing from read-only to read/write. 674 * Note in the superblocks that we're writing. 675 */ 676 fs->lfs_ronly = 0; 677 if (fs->lfs_pflags & LFS_PF_CLEAN) { 678 fs->lfs_pflags &= ~LFS_PF_CLEAN; 679 lfs_writesuper(fs, fs->lfs_sboffs[0]); 680 lfs_writesuper(fs, fs->lfs_sboffs[1]); 681 } 682 } 683 if (args->fspec == NULL) 684 return EINVAL; 685 } 686 687 error = set_statvfs_info(path, UIO_USERSPACE, args->fspec, 688 UIO_USERSPACE, mp->mnt_op->vfs_name, mp, l); 689 if (error == 0) 690 (void)strncpy(fs->lfs_fsmnt, mp->mnt_stat.f_mntonname, 691 sizeof(fs->lfs_fsmnt)); 692 return error; 693 694 fail: 695 vrele(devvp); 696 return (error); 697 } 698 699 700 /* 701 * Common code for mount and mountroot 702 * LFS specific 703 */ 704 int 705 lfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l) 706 { 707 struct dlfs *tdfs, *dfs, *adfs; 708 struct lfs *fs; 709 struct ufsmount *ump; 710 struct vnode *vp; 711 struct buf *bp, *abp; 712 struct partinfo dpart; 713 dev_t dev; 714 int error, i, ronly, secsize, fsbsize; 715 kauth_cred_t cred; 716 CLEANERINFO *cip; 717 SEGUSE *sup; 718 daddr_t sb_addr; 719 720 cred = l ? l->l_cred : NOCRED; 721 722 /* 723 * Flush out any old buffers remaining from a previous use. 724 */ 725 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 726 error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0); 727 VOP_UNLOCK(devvp, 0); 728 if (error) 729 return (error); 730 731 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 732 if (VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, cred) != 0) 733 secsize = DEV_BSIZE; 734 else 735 secsize = dpart.disklab->d_secsize; 736 737 /* Don't free random space on error. */ 738 bp = NULL; 739 abp = NULL; 740 ump = NULL; 741 742 sb_addr = LFS_LABELPAD / secsize; 743 while (1) { 744 /* Read in the superblock. */ 745 error = bread(devvp, sb_addr, LFS_SBPAD, cred, 0, &bp); 746 if (error) 747 goto out; 748 dfs = (struct dlfs *)bp->b_data; 749 750 /* Check the basics. */ 751 if (dfs->dlfs_magic != LFS_MAGIC || dfs->dlfs_bsize > MAXBSIZE || 752 dfs->dlfs_version > LFS_VERSION || 753 dfs->dlfs_bsize < sizeof(struct dlfs)) { 754 DLOG((DLOG_MOUNT, "lfs_mountfs: primary superblock sanity failed\n")); 755 error = EINVAL; /* XXX needs translation */ 756 goto out; 757 } 758 if (dfs->dlfs_inodefmt > LFS_MAXINODEFMT) { 759 DLOG((DLOG_MOUNT, "lfs_mountfs: unknown inode format %d\n", 760 dfs->dlfs_inodefmt)); 761 error = EINVAL; 762 goto out; 763 } 764 765 if (dfs->dlfs_version == 1) 766 fsbsize = secsize; 767 else { 768 fsbsize = 1 << (dfs->dlfs_bshift - dfs->dlfs_blktodb + 769 dfs->dlfs_fsbtodb); 770 /* 771 * Could be, if the frag size is large enough, that we 772 * don't have the "real" primary superblock. If that's 773 * the case, get the real one, and try again. 774 */ 775 if (sb_addr != dfs->dlfs_sboffs[0] << 776 dfs->dlfs_fsbtodb) { 777 DLOG((DLOG_MOUNT, "lfs_mountfs: sb daddr" 778 " 0x%llx is not right, trying 0x%llx\n", 779 (long long)sb_addr, 780 (long long)(dfs->dlfs_sboffs[0] << 781 dfs->dlfs_fsbtodb))); 782 sb_addr = dfs->dlfs_sboffs[0] << 783 dfs->dlfs_fsbtodb; 784 brelse(bp, 0); 785 continue; 786 } 787 } 788 break; 789 } 790 791 /* 792 * Check the second superblock to see which is newer; then mount 793 * using the older of the two. This is necessary to ensure that 794 * the filesystem is valid if it was not unmounted cleanly. 795 */ 796 797 if (dfs->dlfs_sboffs[1] && 798 dfs->dlfs_sboffs[1] - LFS_LABELPAD / fsbsize > LFS_SBPAD / fsbsize) 799 { 800 error = bread(devvp, dfs->dlfs_sboffs[1] * (fsbsize / secsize), 801 LFS_SBPAD, cred, 0, &abp); 802 if (error) 803 goto out; 804 adfs = (struct dlfs *)abp->b_data; 805 806 if (dfs->dlfs_version == 1) { 807 /* 1s resolution comparison */ 808 if (adfs->dlfs_tstamp < dfs->dlfs_tstamp) 809 tdfs = adfs; 810 else 811 tdfs = dfs; 812 } else { 813 /* monotonic infinite-resolution comparison */ 814 if (adfs->dlfs_serial < dfs->dlfs_serial) 815 tdfs = adfs; 816 else 817 tdfs = dfs; 818 } 819 820 /* Check the basics. */ 821 if (tdfs->dlfs_magic != LFS_MAGIC || 822 tdfs->dlfs_bsize > MAXBSIZE || 823 tdfs->dlfs_version > LFS_VERSION || 824 tdfs->dlfs_bsize < sizeof(struct dlfs)) { 825 DLOG((DLOG_MOUNT, "lfs_mountfs: alt superblock" 826 " sanity failed\n")); 827 error = EINVAL; /* XXX needs translation */ 828 goto out; 829 } 830 } else { 831 DLOG((DLOG_MOUNT, "lfs_mountfs: invalid alt superblock" 832 " daddr=0x%x\n", dfs->dlfs_sboffs[1])); 833 error = EINVAL; 834 goto out; 835 } 836 837 /* Allocate the mount structure, copy the superblock into it. */ 838 fs = malloc(sizeof(struct lfs), M_UFSMNT, M_WAITOK | M_ZERO); 839 memcpy(&fs->lfs_dlfs, tdfs, sizeof(struct dlfs)); 840 841 /* Compatibility */ 842 if (fs->lfs_version < 2) { 843 fs->lfs_sumsize = LFS_V1_SUMMARY_SIZE; 844 fs->lfs_ibsize = fs->lfs_bsize; 845 fs->lfs_start = fs->lfs_sboffs[0]; 846 fs->lfs_tstamp = fs->lfs_otstamp; 847 fs->lfs_fsbtodb = 0; 848 } 849 if (fs->lfs_resvseg == 0) 850 fs->lfs_resvseg = MIN(fs->lfs_minfreeseg - 1, \ 851 MAX(MIN_RESV_SEGS, fs->lfs_minfreeseg / 2 + 1)); 852 853 /* 854 * If we aren't going to be able to write meaningfully to this 855 * filesystem, and were not mounted readonly, bomb out now. 856 */ 857 if (fsbtob(fs, LFS_NRESERVE(fs)) > LFS_MAX_BYTES && !ronly) { 858 DLOG((DLOG_MOUNT, "lfs_mount: to mount this filesystem read/write," 859 " we need BUFPAGES >= %lld\n", 860 (long long)((bufmem_hiwater / bufmem_lowater) * 861 LFS_INVERSE_MAX_BYTES( 862 fsbtob(fs, LFS_NRESERVE(fs))) >> PAGE_SHIFT))); 863 free(fs, M_UFSMNT); 864 error = EFBIG; /* XXX needs translation */ 865 goto out; 866 } 867 868 /* Before rolling forward, lock so vget will sleep for other procs */ 869 if (l != NULL) { 870 fs->lfs_flags = LFS_NOTYET; 871 fs->lfs_rfpid = l->l_proc->p_pid; 872 } 873 874 ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK | M_ZERO); 875 ump->um_lfs = fs; 876 ump->um_ops = &lfs_ufsops; 877 ump->um_fstype = UFS1; 878 if (sizeof(struct lfs) < LFS_SBPAD) { /* XXX why? */ 879 brelse(bp, BC_INVAL); 880 brelse(abp, BC_INVAL); 881 } else { 882 brelse(bp, 0); 883 brelse(abp, 0); 884 } 885 bp = NULL; 886 abp = NULL; 887 888 889 /* Set up the I/O information */ 890 fs->lfs_devbsize = secsize; 891 fs->lfs_iocount = 0; 892 fs->lfs_diropwait = 0; 893 fs->lfs_activesb = 0; 894 fs->lfs_uinodes = 0; 895 fs->lfs_ravail = 0; 896 fs->lfs_favail = 0; 897 fs->lfs_sbactive = 0; 898 899 /* Set up the ifile and lock aflags */ 900 fs->lfs_doifile = 0; 901 fs->lfs_writer = 0; 902 fs->lfs_dirops = 0; 903 fs->lfs_nadirop = 0; 904 fs->lfs_seglock = 0; 905 fs->lfs_pdflush = 0; 906 fs->lfs_sleepers = 0; 907 fs->lfs_pages = 0; 908 rw_init(&fs->lfs_fraglock); 909 rw_init(&fs->lfs_iflock); 910 cv_init(&fs->lfs_stopcv, "lfsstop"); 911 912 /* Set the file system readonly/modify bits. */ 913 fs->lfs_ronly = ronly; 914 if (ronly == 0) 915 fs->lfs_fmod = 1; 916 917 /* Initialize the mount structure. */ 918 dev = devvp->v_rdev; 919 mp->mnt_data = ump; 920 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 921 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_LFS); 922 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 923 mp->mnt_stat.f_namemax = LFS_MAXNAMLEN; 924 mp->mnt_stat.f_iosize = fs->lfs_bsize; 925 mp->mnt_flag |= MNT_LOCAL; 926 mp->mnt_fs_bshift = fs->lfs_bshift; 927 ump->um_flags = 0; 928 ump->um_mountp = mp; 929 ump->um_dev = dev; 930 ump->um_devvp = devvp; 931 ump->um_bptrtodb = fs->lfs_fsbtodb; 932 ump->um_seqinc = fragstofsb(fs, fs->lfs_frag); 933 ump->um_nindir = fs->lfs_nindir; 934 ump->um_lognindir = ffs(fs->lfs_nindir) - 1; 935 for (i = 0; i < MAXQUOTAS; i++) 936 ump->um_quotas[i] = NULLVP; 937 ump->um_maxsymlinklen = fs->lfs_maxsymlinklen; 938 ump->um_dirblksiz = DIRBLKSIZ; 939 ump->um_maxfilesize = fs->lfs_maxfilesize; 940 if (ump->um_maxsymlinklen > 0) 941 mp->mnt_iflag |= IMNT_DTYPE; 942 devvp->v_specmountpoint = mp; 943 944 /* Set up reserved memory for pageout */ 945 lfs_setup_resblks(fs); 946 /* Set up vdirop tailq */ 947 TAILQ_INIT(&fs->lfs_dchainhd); 948 /* and paging tailq */ 949 TAILQ_INIT(&fs->lfs_pchainhd); 950 /* and delayed segment accounting for truncation list */ 951 LIST_INIT(&fs->lfs_segdhd); 952 953 /* 954 * We use the ifile vnode for almost every operation. Instead of 955 * retrieving it from the hash table each time we retrieve it here, 956 * artificially increment the reference count and keep a pointer 957 * to it in the incore copy of the superblock. 958 */ 959 if ((error = VFS_VGET(mp, LFS_IFILE_INUM, &vp)) != 0) { 960 DLOG((DLOG_MOUNT, "lfs_mountfs: ifile vget failed, error=%d\n", error)); 961 goto out; 962 } 963 fs->lfs_ivnode = vp; 964 VREF(vp); 965 966 /* Set up inode bitmap and order free list */ 967 lfs_order_freelist(fs); 968 969 /* Set up segment usage flags for the autocleaner. */ 970 fs->lfs_nactive = 0; 971 fs->lfs_suflags = (u_int32_t **)malloc(2 * sizeof(u_int32_t *), 972 M_SEGMENT, M_WAITOK); 973 fs->lfs_suflags[0] = (u_int32_t *)malloc(fs->lfs_nseg * sizeof(u_int32_t), 974 M_SEGMENT, M_WAITOK); 975 fs->lfs_suflags[1] = (u_int32_t *)malloc(fs->lfs_nseg * sizeof(u_int32_t), 976 M_SEGMENT, M_WAITOK); 977 memset(fs->lfs_suflags[1], 0, fs->lfs_nseg * sizeof(u_int32_t)); 978 for (i = 0; i < fs->lfs_nseg; i++) { 979 int changed; 980 981 LFS_SEGENTRY(sup, fs, i, bp); 982 changed = 0; 983 if (!ronly) { 984 if (sup->su_nbytes == 0 && 985 !(sup->su_flags & SEGUSE_EMPTY)) { 986 sup->su_flags |= SEGUSE_EMPTY; 987 ++changed; 988 } else if (!(sup->su_nbytes == 0) && 989 (sup->su_flags & SEGUSE_EMPTY)) { 990 sup->su_flags &= ~SEGUSE_EMPTY; 991 ++changed; 992 } 993 if (sup->su_flags & (SEGUSE_ACTIVE|SEGUSE_INVAL)) { 994 sup->su_flags &= ~(SEGUSE_ACTIVE|SEGUSE_INVAL); 995 ++changed; 996 } 997 } 998 fs->lfs_suflags[0][i] = sup->su_flags; 999 if (changed) 1000 LFS_WRITESEGENTRY(sup, fs, i, bp); 1001 else 1002 brelse(bp, 0); 1003 } 1004 1005 #ifdef LFS_KERNEL_RFW 1006 lfs_roll_forward(fs, mp, l); 1007 #endif 1008 1009 /* If writing, sb is not clean; record in case of immediate crash */ 1010 if (!fs->lfs_ronly) { 1011 fs->lfs_pflags &= ~LFS_PF_CLEAN; 1012 lfs_writesuper(fs, fs->lfs_sboffs[0]); 1013 lfs_writesuper(fs, fs->lfs_sboffs[1]); 1014 } 1015 1016 /* Allow vget now that roll-forward is complete */ 1017 fs->lfs_flags &= ~(LFS_NOTYET); 1018 wakeup(&fs->lfs_flags); 1019 1020 /* 1021 * Initialize the ifile cleaner info with information from 1022 * the superblock. 1023 */ 1024 LFS_CLEANERINFO(cip, fs, bp); 1025 cip->clean = fs->lfs_nclean; 1026 cip->dirty = fs->lfs_nseg - fs->lfs_nclean; 1027 cip->avail = fs->lfs_avail; 1028 cip->bfree = fs->lfs_bfree; 1029 (void) LFS_BWRITE_LOG(bp); /* Ifile */ 1030 1031 /* 1032 * Mark the current segment as ACTIVE, since we're going to 1033 * be writing to it. 1034 */ 1035 LFS_SEGENTRY(sup, fs, dtosn(fs, fs->lfs_offset), bp); 1036 sup->su_flags |= SEGUSE_DIRTY | SEGUSE_ACTIVE; 1037 fs->lfs_nactive++; 1038 LFS_WRITESEGENTRY(sup, fs, dtosn(fs, fs->lfs_offset), bp); /* Ifile */ 1039 1040 /* Now that roll-forward is done, unlock the Ifile */ 1041 vput(vp); 1042 1043 /* Start the pagedaemon-anticipating daemon */ 1044 if (lfs_writer_daemon == 0 && kthread_create(PRI_BIO, 0, NULL, 1045 lfs_writerd, NULL, NULL, "lfs_writer") != 0) 1046 panic("fork lfs_writer"); 1047 1048 printf("WARNING: the log-structured file system is experimental\n" 1049 "WARNING: it may cause system crashes and/or corrupt data\n"); 1050 1051 return (0); 1052 1053 out: 1054 if (bp) 1055 brelse(bp, 0); 1056 if (abp) 1057 brelse(abp, 0); 1058 if (ump) { 1059 free(ump->um_lfs, M_UFSMNT); 1060 free(ump, M_UFSMNT); 1061 mp->mnt_data = NULL; 1062 } 1063 1064 return (error); 1065 } 1066 1067 /* 1068 * unmount system call 1069 */ 1070 int 1071 lfs_unmount(struct mount *mp, int mntflags) 1072 { 1073 struct lwp *l = curlwp; 1074 struct ufsmount *ump; 1075 struct lfs *fs; 1076 int error, flags, ronly; 1077 vnode_t *vp; 1078 1079 flags = 0; 1080 if (mntflags & MNT_FORCE) 1081 flags |= FORCECLOSE; 1082 1083 ump = VFSTOUFS(mp); 1084 fs = ump->um_lfs; 1085 1086 /* Two checkpoints */ 1087 lfs_segwrite(mp, SEGM_CKP | SEGM_SYNC); 1088 lfs_segwrite(mp, SEGM_CKP | SEGM_SYNC); 1089 1090 /* wake up the cleaner so it can die */ 1091 lfs_wakeup_cleaner(fs); 1092 mutex_enter(&lfs_lock); 1093 while (fs->lfs_sleepers) 1094 mtsleep(&fs->lfs_sleepers, PRIBIO + 1, "lfs_sleepers", 0, 1095 &lfs_lock); 1096 mutex_exit(&lfs_lock); 1097 1098 #ifdef QUOTA 1099 if (mp->mnt_flag & MNT_QUOTA) { 1100 int i; 1101 error = vflush(mp, fs->lfs_ivnode, SKIPSYSTEM|flags); 1102 if (error) 1103 return (error); 1104 for (i = 0; i < MAXQUOTAS; i++) { 1105 if (ump->um_quotas[i] == NULLVP) 1106 continue; 1107 quotaoff(l, mp, i); 1108 } 1109 /* 1110 * Here we fall through to vflush again to ensure 1111 * that we have gotten rid of all the system vnodes. 1112 */ 1113 } 1114 #endif 1115 if ((error = vflush(mp, fs->lfs_ivnode, flags)) != 0) 1116 return (error); 1117 if ((error = VFS_SYNC(mp, 1, l->l_cred)) != 0) 1118 return (error); 1119 vp = fs->lfs_ivnode; 1120 mutex_enter(&vp->v_interlock); 1121 if (LIST_FIRST(&vp->v_dirtyblkhd)) 1122 panic("lfs_unmount: still dirty blocks on ifile vnode"); 1123 mutex_exit(&vp->v_interlock); 1124 1125 /* Explicitly write the superblock, to update serial and pflags */ 1126 fs->lfs_pflags |= LFS_PF_CLEAN; 1127 lfs_writesuper(fs, fs->lfs_sboffs[0]); 1128 lfs_writesuper(fs, fs->lfs_sboffs[1]); 1129 mutex_enter(&lfs_lock); 1130 while (fs->lfs_iocount) 1131 mtsleep(&fs->lfs_iocount, PRIBIO + 1, "lfs_umount", 0, 1132 &lfs_lock); 1133 mutex_exit(&lfs_lock); 1134 1135 /* Finish with the Ifile, now that we're done with it */ 1136 vgone(fs->lfs_ivnode); 1137 1138 ronly = !fs->lfs_ronly; 1139 if (ump->um_devvp->v_type != VBAD) 1140 ump->um_devvp->v_specmountpoint = NULL; 1141 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 1142 error = VOP_CLOSE(ump->um_devvp, 1143 ronly ? FREAD : FREAD|FWRITE, NOCRED); 1144 vput(ump->um_devvp); 1145 1146 /* Complain about page leakage */ 1147 if (fs->lfs_pages > 0) 1148 printf("lfs_unmount: still claim %d pages (%d in subsystem)\n", 1149 fs->lfs_pages, lfs_subsys_pages); 1150 1151 /* Free per-mount data structures */ 1152 free(fs->lfs_ino_bitmap, M_SEGMENT); 1153 free(fs->lfs_suflags[0], M_SEGMENT); 1154 free(fs->lfs_suflags[1], M_SEGMENT); 1155 free(fs->lfs_suflags, M_SEGMENT); 1156 lfs_free_resblks(fs); 1157 cv_destroy(&fs->lfs_stopcv); 1158 rw_destroy(&fs->lfs_fraglock); 1159 rw_destroy(&fs->lfs_iflock); 1160 free(fs, M_UFSMNT); 1161 free(ump, M_UFSMNT); 1162 1163 mp->mnt_data = NULL; 1164 mp->mnt_flag &= ~MNT_LOCAL; 1165 return (error); 1166 } 1167 1168 /* 1169 * Get file system statistics. 1170 * 1171 * NB: We don't lock to access the superblock here, because it's not 1172 * really that important if we get it wrong. 1173 */ 1174 int 1175 lfs_statvfs(struct mount *mp, struct statvfs *sbp) 1176 { 1177 struct lfs *fs; 1178 struct ufsmount *ump; 1179 1180 ump = VFSTOUFS(mp); 1181 fs = ump->um_lfs; 1182 if (fs->lfs_magic != LFS_MAGIC) 1183 panic("lfs_statvfs: magic"); 1184 1185 sbp->f_bsize = fs->lfs_bsize; 1186 sbp->f_frsize = fs->lfs_fsize; 1187 sbp->f_iosize = fs->lfs_bsize; 1188 sbp->f_blocks = fsbtofrags(fs, LFS_EST_NONMETA(fs) - VTOI(fs->lfs_ivnode)->i_lfs_effnblks); 1189 1190 sbp->f_bfree = fsbtofrags(fs, LFS_EST_BFREE(fs)); 1191 KASSERT(sbp->f_bfree <= fs->lfs_dsize); 1192 #if 0 1193 if (sbp->f_bfree < 0) 1194 sbp->f_bfree = 0; 1195 #endif 1196 1197 sbp->f_bresvd = fsbtofrags(fs, LFS_EST_RSVD(fs)); 1198 if (sbp->f_bfree > sbp->f_bresvd) 1199 sbp->f_bavail = sbp->f_bfree - sbp->f_bresvd; 1200 else 1201 sbp->f_bavail = 0; 1202 1203 sbp->f_files = fs->lfs_bfree / btofsb(fs, fs->lfs_ibsize) * INOPB(fs); 1204 sbp->f_ffree = sbp->f_files - fs->lfs_nfiles; 1205 sbp->f_favail = sbp->f_ffree; 1206 sbp->f_fresvd = 0; 1207 copy_statvfs_info(sbp, mp); 1208 return (0); 1209 } 1210 1211 /* 1212 * Go through the disk queues to initiate sandbagged IO; 1213 * go through the inodes to write those that have been modified; 1214 * initiate the writing of the super block if it has been modified. 1215 * 1216 * Note: we are always called with the filesystem marked `MPBUSY'. 1217 */ 1218 int 1219 lfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 1220 { 1221 int error; 1222 struct lfs *fs; 1223 1224 fs = VFSTOUFS(mp)->um_lfs; 1225 if (fs->lfs_ronly) 1226 return 0; 1227 1228 /* Snapshots should not hose the syncer */ 1229 /* 1230 * XXX Sync can block here anyway, since we don't have a very 1231 * XXX good idea of how much data is pending. If it's more 1232 * XXX than a segment and lfs_nextseg is close to the end of 1233 * XXX the log, we'll likely block. 1234 */ 1235 mutex_enter(&lfs_lock); 1236 if (fs->lfs_nowrap && fs->lfs_nextseg < fs->lfs_curseg) { 1237 mutex_exit(&lfs_lock); 1238 return 0; 1239 } 1240 mutex_exit(&lfs_lock); 1241 1242 lfs_writer_enter(fs, "lfs_dirops"); 1243 1244 /* All syncs must be checkpoints until roll-forward is implemented. */ 1245 DLOG((DLOG_FLUSH, "lfs_sync at 0x%x\n", fs->lfs_offset)); 1246 error = lfs_segwrite(mp, SEGM_CKP | (waitfor ? SEGM_SYNC : 0)); 1247 lfs_writer_leave(fs); 1248 #ifdef QUOTA 1249 qsync(mp); 1250 #endif 1251 return (error); 1252 } 1253 1254 /* 1255 * Look up an LFS dinode number to find its incore vnode. If not already 1256 * in core, read it in from the specified device. Return the inode locked. 1257 * Detection and handling of mount points must be done by the calling routine. 1258 */ 1259 int 1260 lfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 1261 { 1262 struct lfs *fs; 1263 struct ufs1_dinode *dip; 1264 struct inode *ip; 1265 struct buf *bp; 1266 struct ifile *ifp; 1267 struct vnode *vp; 1268 struct ufsmount *ump; 1269 daddr_t daddr; 1270 dev_t dev; 1271 int error, retries; 1272 struct timespec ts; 1273 1274 memset(&ts, 0, sizeof ts); /* XXX gcc */ 1275 1276 ump = VFSTOUFS(mp); 1277 dev = ump->um_dev; 1278 fs = ump->um_lfs; 1279 1280 /* 1281 * If the filesystem is not completely mounted yet, suspend 1282 * any access requests (wait for roll-forward to complete). 1283 */ 1284 mutex_enter(&lfs_lock); 1285 while ((fs->lfs_flags & LFS_NOTYET) && curproc->p_pid != fs->lfs_rfpid) 1286 mtsleep(&fs->lfs_flags, PRIBIO+1, "lfs_notyet", 0, 1287 &lfs_lock); 1288 mutex_exit(&lfs_lock); 1289 1290 retry: 1291 if ((*vpp = ufs_ihashget(dev, ino, LK_EXCLUSIVE)) != NULL) 1292 return (0); 1293 1294 if ((error = getnewvnode(VT_LFS, mp, lfs_vnodeop_p, &vp)) != 0) { 1295 *vpp = NULL; 1296 return (error); 1297 } 1298 1299 mutex_enter(&ufs_hashlock); 1300 if (ufs_ihashget(dev, ino, 0) != NULL) { 1301 mutex_exit(&ufs_hashlock); 1302 ungetnewvnode(vp); 1303 goto retry; 1304 } 1305 1306 /* Translate the inode number to a disk address. */ 1307 if (ino == LFS_IFILE_INUM) 1308 daddr = fs->lfs_idaddr; 1309 else { 1310 /* XXX bounds-check this too */ 1311 LFS_IENTRY(ifp, fs, ino, bp); 1312 daddr = ifp->if_daddr; 1313 if (fs->lfs_version > 1) { 1314 ts.tv_sec = ifp->if_atime_sec; 1315 ts.tv_nsec = ifp->if_atime_nsec; 1316 } 1317 1318 brelse(bp, 0); 1319 if (daddr == LFS_UNUSED_DADDR) { 1320 *vpp = NULLVP; 1321 mutex_exit(&ufs_hashlock); 1322 ungetnewvnode(vp); 1323 return (ENOENT); 1324 } 1325 } 1326 1327 /* Allocate/init new vnode/inode. */ 1328 lfs_vcreate(mp, ino, vp); 1329 1330 /* 1331 * Put it onto its hash chain and lock it so that other requests for 1332 * this inode will block if they arrive while we are sleeping waiting 1333 * for old data structures to be purged or for the contents of the 1334 * disk portion of this inode to be read. 1335 */ 1336 ip = VTOI(vp); 1337 ufs_ihashins(ip); 1338 mutex_exit(&ufs_hashlock); 1339 1340 /* 1341 * XXX 1342 * This may not need to be here, logically it should go down with 1343 * the i_devvp initialization. 1344 * Ask Kirk. 1345 */ 1346 ip->i_lfs = ump->um_lfs; 1347 1348 /* Read in the disk contents for the inode, copy into the inode. */ 1349 retries = 0; 1350 again: 1351 error = bread(ump->um_devvp, fsbtodb(fs, daddr), 1352 (fs->lfs_version == 1 ? fs->lfs_bsize : fs->lfs_ibsize), 1353 NOCRED, 0, &bp); 1354 if (error) { 1355 /* 1356 * The inode does not contain anything useful, so it would 1357 * be misleading to leave it on its hash chain. With mode 1358 * still zero, it will be unlinked and returned to the free 1359 * list by vput(). 1360 */ 1361 vput(vp); 1362 brelse(bp, 0); 1363 *vpp = NULL; 1364 return (error); 1365 } 1366 1367 dip = lfs_ifind(fs, ino, bp); 1368 if (dip == NULL) { 1369 /* Assume write has not completed yet; try again */ 1370 brelse(bp, BC_INVAL); 1371 ++retries; 1372 if (retries > LFS_IFIND_RETRIES) { 1373 #ifdef DEBUG 1374 /* If the seglock is held look at the bpp to see 1375 what is there anyway */ 1376 mutex_enter(&lfs_lock); 1377 if (fs->lfs_seglock > 0) { 1378 struct buf **bpp; 1379 struct ufs1_dinode *dp; 1380 int i; 1381 1382 for (bpp = fs->lfs_sp->bpp; 1383 bpp != fs->lfs_sp->cbpp; ++bpp) { 1384 if ((*bpp)->b_vp == fs->lfs_ivnode && 1385 bpp != fs->lfs_sp->bpp) { 1386 /* Inode block */ 1387 printf("lfs_vget: block 0x%" PRIx64 ": ", 1388 (*bpp)->b_blkno); 1389 dp = (struct ufs1_dinode *)(*bpp)->b_data; 1390 for (i = 0; i < INOPB(fs); i++) 1391 if (dp[i].di_u.inumber) 1392 printf("%d ", dp[i].di_u.inumber); 1393 printf("\n"); 1394 } 1395 } 1396 } 1397 mutex_exit(&lfs_lock); 1398 #endif /* DEBUG */ 1399 panic("lfs_vget: dinode not found"); 1400 } 1401 mutex_enter(&lfs_lock); 1402 if (fs->lfs_iocount) { 1403 DLOG((DLOG_VNODE, "lfs_vget: dinode %d not found, retrying...\n", ino)); 1404 (void)mtsleep(&fs->lfs_iocount, PRIBIO + 1, 1405 "lfs ifind", 1, &lfs_lock); 1406 } else 1407 retries = LFS_IFIND_RETRIES; 1408 mutex_exit(&lfs_lock); 1409 goto again; 1410 } 1411 *ip->i_din.ffs1_din = *dip; 1412 brelse(bp, 0); 1413 1414 if (fs->lfs_version > 1) { 1415 ip->i_ffs1_atime = ts.tv_sec; 1416 ip->i_ffs1_atimensec = ts.tv_nsec; 1417 } 1418 1419 lfs_vinit(mp, &vp); 1420 1421 *vpp = vp; 1422 1423 KASSERT(VOP_ISLOCKED(vp)); 1424 1425 return (0); 1426 } 1427 1428 /* 1429 * File handle to vnode 1430 */ 1431 int 1432 lfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 1433 { 1434 struct lfid lfh; 1435 struct buf *bp; 1436 IFILE *ifp; 1437 int32_t daddr; 1438 struct lfs *fs; 1439 vnode_t *vp; 1440 1441 if (fhp->fid_len != sizeof(struct lfid)) 1442 return EINVAL; 1443 1444 memcpy(&lfh, fhp, sizeof(lfh)); 1445 if (lfh.lfid_ino < LFS_IFILE_INUM) 1446 return ESTALE; 1447 1448 fs = VFSTOUFS(mp)->um_lfs; 1449 if (lfh.lfid_ident != fs->lfs_ident) 1450 return ESTALE; 1451 1452 if (lfh.lfid_ino > 1453 ((VTOI(fs->lfs_ivnode)->i_ffs1_size >> fs->lfs_bshift) - 1454 fs->lfs_cleansz - fs->lfs_segtabsz) * fs->lfs_ifpb) 1455 return ESTALE; 1456 1457 mutex_enter(&ufs_ihash_lock); 1458 vp = ufs_ihashlookup(VFSTOUFS(mp)->um_dev, lfh.lfid_ino); 1459 mutex_exit(&ufs_ihash_lock); 1460 if (vp == NULL) { 1461 LFS_IENTRY(ifp, fs, lfh.lfid_ino, bp); 1462 daddr = ifp->if_daddr; 1463 brelse(bp, 0); 1464 if (daddr == LFS_UNUSED_DADDR) 1465 return ESTALE; 1466 } 1467 1468 return (ufs_fhtovp(mp, &lfh.lfid_ufid, vpp)); 1469 } 1470 1471 /* 1472 * Vnode pointer to File handle 1473 */ 1474 /* ARGSUSED */ 1475 int 1476 lfs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 1477 { 1478 struct inode *ip; 1479 struct lfid lfh; 1480 1481 if (*fh_size < sizeof(struct lfid)) { 1482 *fh_size = sizeof(struct lfid); 1483 return E2BIG; 1484 } 1485 *fh_size = sizeof(struct lfid); 1486 ip = VTOI(vp); 1487 memset(&lfh, 0, sizeof(lfh)); 1488 lfh.lfid_len = sizeof(struct lfid); 1489 lfh.lfid_ino = ip->i_number; 1490 lfh.lfid_gen = ip->i_gen; 1491 lfh.lfid_ident = ip->i_lfs->lfs_ident; 1492 memcpy(fhp, &lfh, sizeof(lfh)); 1493 return (0); 1494 } 1495 1496 /* 1497 * ufs_bmaparray callback function for writing. 1498 * 1499 * Since blocks will be written to the new segment anyway, 1500 * we don't care about current daddr of them. 1501 */ 1502 static bool 1503 lfs_issequential_hole(const struct ufsmount *ump, 1504 daddr_t daddr0, daddr_t daddr1) 1505 { 1506 daddr0 = (daddr_t)((int32_t)daddr0); /* XXX ondisk32 */ 1507 daddr1 = (daddr_t)((int32_t)daddr1); /* XXX ondisk32 */ 1508 1509 KASSERT(daddr0 == UNWRITTEN || 1510 (0 <= daddr0 && daddr0 <= LFS_MAX_DADDR)); 1511 KASSERT(daddr1 == UNWRITTEN || 1512 (0 <= daddr1 && daddr1 <= LFS_MAX_DADDR)); 1513 1514 /* NOTE: all we want to know here is 'hole or not'. */ 1515 /* NOTE: UNASSIGNED is converted to 0 by ufs_bmaparray. */ 1516 1517 /* 1518 * treat UNWRITTENs and all resident blocks as 'contiguous' 1519 */ 1520 if (daddr0 != 0 && daddr1 != 0) 1521 return true; 1522 1523 /* 1524 * both are in hole? 1525 */ 1526 if (daddr0 == 0 && daddr1 == 0) 1527 return true; /* all holes are 'contiguous' for us. */ 1528 1529 return false; 1530 } 1531 1532 /* 1533 * lfs_gop_write functions exactly like genfs_gop_write, except that 1534 * (1) it requires the seglock to be held by its caller, and sp->fip 1535 * to be properly initialized (it will return without re-initializing 1536 * sp->fip, and without calling lfs_writeseg). 1537 * (2) it uses the remaining space in the segment, rather than VOP_BMAP, 1538 * to determine how large a block it can write at once (though it does 1539 * still use VOP_BMAP to find holes in the file); 1540 * (3) it calls lfs_gatherblock instead of VOP_STRATEGY on its blocks 1541 * (leaving lfs_writeseg to deal with the cluster blocks, so we might 1542 * now have clusters of clusters, ick.) 1543 */ 1544 static int 1545 lfs_gop_write(struct vnode *vp, struct vm_page **pgs, int npages, 1546 int flags) 1547 { 1548 int i, error, run, haveeof = 0; 1549 int fs_bshift; 1550 vaddr_t kva; 1551 off_t eof, offset, startoffset = 0; 1552 size_t bytes, iobytes, skipbytes; 1553 daddr_t lbn, blkno; 1554 struct vm_page *pg; 1555 struct buf *mbp, *bp; 1556 struct vnode *devvp = VTOI(vp)->i_devvp; 1557 struct inode *ip = VTOI(vp); 1558 struct lfs *fs = ip->i_lfs; 1559 struct segment *sp = fs->lfs_sp; 1560 UVMHIST_FUNC("lfs_gop_write"); UVMHIST_CALLED(ubchist); 1561 1562 ASSERT_SEGLOCK(fs); 1563 1564 /* The Ifile lives in the buffer cache */ 1565 KASSERT(vp != fs->lfs_ivnode); 1566 1567 /* 1568 * We don't want to fill the disk before the cleaner has a chance 1569 * to make room for us. If we're in danger of doing that, fail 1570 * with EAGAIN. The caller will have to notice this, unlock 1571 * so the cleaner can run, relock and try again. 1572 * 1573 * We must write everything, however, if our vnode is being 1574 * reclaimed. 1575 */ 1576 if (LFS_STARVED_FOR_SEGS(fs) && vp != fs->lfs_flushvp) 1577 goto tryagain; 1578 1579 /* 1580 * Sometimes things slip past the filters in lfs_putpages, 1581 * and the pagedaemon tries to write pages---problem is 1582 * that the pagedaemon never acquires the segment lock. 1583 * 1584 * Alternatively, pages that were clean when we called 1585 * genfs_putpages may have become dirty in the meantime. In this 1586 * case the segment header is not properly set up for blocks 1587 * to be added to it. 1588 * 1589 * Unbusy and unclean the pages, and put them on the ACTIVE 1590 * queue under the hypothesis that they couldn't have got here 1591 * unless they were modified *quite* recently. 1592 * 1593 * XXXUBC that last statement is an oversimplification of course. 1594 */ 1595 if (!LFS_SEGLOCK_HELD(fs) || 1596 (ip->i_lfs_iflags & LFSI_NO_GOP_WRITE) || 1597 (pgs[0]->offset & fs->lfs_bmask) != 0) { 1598 goto tryagain; 1599 } 1600 1601 UVMHIST_LOG(ubchist, "vp %p pgs %p npages %d flags 0x%x", 1602 vp, pgs, npages, flags); 1603 1604 GOP_SIZE(vp, vp->v_size, &eof, 0); 1605 haveeof = 1; 1606 1607 if (vp->v_type == VREG) 1608 fs_bshift = vp->v_mount->mnt_fs_bshift; 1609 else 1610 fs_bshift = DEV_BSHIFT; 1611 error = 0; 1612 pg = pgs[0]; 1613 startoffset = pg->offset; 1614 KASSERT(eof >= 0); 1615 1616 if (startoffset >= eof) { 1617 goto tryagain; 1618 } else 1619 bytes = MIN(npages << PAGE_SHIFT, eof - startoffset); 1620 skipbytes = 0; 1621 1622 KASSERT(bytes != 0); 1623 1624 /* Swap PG_DELWRI for PG_PAGEOUT */ 1625 for (i = 0; i < npages; i++) { 1626 if (pgs[i]->flags & PG_DELWRI) { 1627 KASSERT(!(pgs[i]->flags & PG_PAGEOUT)); 1628 pgs[i]->flags &= ~PG_DELWRI; 1629 pgs[i]->flags |= PG_PAGEOUT; 1630 uvm_pageout_start(1); 1631 mutex_enter(&uvm_pageqlock); 1632 uvm_pageunwire(pgs[i]); 1633 mutex_exit(&uvm_pageqlock); 1634 } 1635 } 1636 1637 /* 1638 * Check to make sure we're starting on a block boundary. 1639 * We'll check later to make sure we always write entire 1640 * blocks (or fragments). 1641 */ 1642 if (startoffset & fs->lfs_bmask) 1643 printf("%" PRId64 " & %" PRId64 " = %" PRId64 "\n", 1644 startoffset, fs->lfs_bmask, 1645 startoffset & fs->lfs_bmask); 1646 KASSERT((startoffset & fs->lfs_bmask) == 0); 1647 if (bytes & fs->lfs_ffmask) { 1648 printf("lfs_gop_write: asked to write %ld bytes\n", (long)bytes); 1649 panic("lfs_gop_write: non-integer blocks"); 1650 } 1651 1652 /* 1653 * We could deadlock here on pager_map with UVMPAGER_MAPIN_WAITOK. 1654 * If we would, write what we have and try again. If we don't 1655 * have anything to write, we'll have to sleep. 1656 */ 1657 if ((kva = uvm_pagermapin(pgs, npages, UVMPAGER_MAPIN_WRITE | 1658 (((SEGSUM *)(sp->segsum))->ss_nfinfo < 1 ? 1659 UVMPAGER_MAPIN_WAITOK : 0))) == 0x0) { 1660 DLOG((DLOG_PAGE, "lfs_gop_write: forcing write\n")); 1661 #if 0 1662 " with nfinfo=%d at offset 0x%x\n", 1663 (int)((SEGSUM *)(sp->segsum))->ss_nfinfo, 1664 (unsigned)fs->lfs_offset)); 1665 #endif 1666 lfs_updatemeta(sp); 1667 lfs_release_finfo(fs); 1668 (void) lfs_writeseg(fs, sp); 1669 1670 lfs_acquire_finfo(fs, ip->i_number, ip->i_gen); 1671 1672 /* 1673 * Having given up all of the pager_map we were holding, 1674 * we can now wait for aiodoned to reclaim it for us 1675 * without fear of deadlock. 1676 */ 1677 kva = uvm_pagermapin(pgs, npages, UVMPAGER_MAPIN_WRITE | 1678 UVMPAGER_MAPIN_WAITOK); 1679 } 1680 1681 mutex_enter(&vp->v_interlock); 1682 vp->v_numoutput += 2; /* one for biodone, one for aiodone */ 1683 mutex_exit(&vp->v_interlock); 1684 1685 mbp = getiobuf(NULL, true); 1686 UVMHIST_LOG(ubchist, "vp %p mbp %p num now %d bytes 0x%x", 1687 vp, mbp, vp->v_numoutput, bytes); 1688 mbp->b_bufsize = npages << PAGE_SHIFT; 1689 mbp->b_data = (void *)kva; 1690 mbp->b_resid = mbp->b_bcount = bytes; 1691 mbp->b_cflags = BC_BUSY|BC_AGE; 1692 mbp->b_iodone = uvm_aio_biodone; 1693 1694 bp = NULL; 1695 for (offset = startoffset; 1696 bytes > 0; 1697 offset += iobytes, bytes -= iobytes) { 1698 lbn = offset >> fs_bshift; 1699 error = ufs_bmaparray(vp, lbn, &blkno, NULL, NULL, &run, 1700 lfs_issequential_hole); 1701 if (error) { 1702 UVMHIST_LOG(ubchist, "ufs_bmaparray() -> %d", 1703 error,0,0,0); 1704 skipbytes += bytes; 1705 bytes = 0; 1706 break; 1707 } 1708 1709 iobytes = MIN((((off_t)lbn + 1 + run) << fs_bshift) - offset, 1710 bytes); 1711 if (blkno == (daddr_t)-1) { 1712 skipbytes += iobytes; 1713 continue; 1714 } 1715 1716 /* 1717 * Discover how much we can really pack into this buffer. 1718 */ 1719 /* If no room in the current segment, finish it up */ 1720 if (sp->sum_bytes_left < sizeof(int32_t) || 1721 sp->seg_bytes_left < (1 << fs->lfs_bshift)) { 1722 int vers; 1723 1724 lfs_updatemeta(sp); 1725 vers = sp->fip->fi_version; 1726 lfs_release_finfo(fs); 1727 (void) lfs_writeseg(fs, sp); 1728 1729 lfs_acquire_finfo(fs, ip->i_number, vers); 1730 } 1731 /* Check both for space in segment and space in segsum */ 1732 iobytes = MIN(iobytes, (sp->seg_bytes_left >> fs_bshift) 1733 << fs_bshift); 1734 iobytes = MIN(iobytes, (sp->sum_bytes_left / sizeof(int32_t)) 1735 << fs_bshift); 1736 KASSERT(iobytes > 0); 1737 1738 /* if it's really one i/o, don't make a second buf */ 1739 if (offset == startoffset && iobytes == bytes) { 1740 bp = mbp; 1741 /* correct overcount if there is no second buffer */ 1742 mutex_enter(&vp->v_interlock); 1743 --vp->v_numoutput; 1744 mutex_exit(&vp->v_interlock); 1745 } else { 1746 bp = getiobuf(NULL, true); 1747 UVMHIST_LOG(ubchist, "vp %p bp %p num now %d", 1748 vp, bp, vp->v_numoutput, 0); 1749 nestiobuf_setup(mbp, bp, offset - pg->offset, iobytes); 1750 /* 1751 * LFS doesn't like async I/O here, dies with 1752 * and assert in lfs_bwrite(). Is that assert 1753 * valid? I retained non-async behaviour when 1754 * converted this to use nestiobuf --pooka 1755 */ 1756 bp->b_flags &= ~B_ASYNC; 1757 /* 1758 * LFS uses VOP_BWRITE instead of VOP_STRATEGY. 1759 * Therefore biodone doesn't get called for 1760 * the buffer. Therefore decrement the output 1761 * counter that nestiobuf_setup() incremented. 1762 */ 1763 mutex_enter(&vp->v_interlock); 1764 vp->v_numoutput--; 1765 mutex_exit(&vp->v_interlock); 1766 } 1767 1768 /* XXX This is silly ... is this necessary? */ 1769 mutex_enter(&bufcache_lock); 1770 mutex_enter(&vp->v_interlock); 1771 bgetvp(vp, bp); 1772 mutex_exit(&vp->v_interlock); 1773 mutex_exit(&bufcache_lock); 1774 1775 bp->b_lblkno = lblkno(fs, offset); 1776 bp->b_private = mbp; 1777 if (devvp->v_type == VBLK) { 1778 bp->b_dev = devvp->v_rdev; 1779 } 1780 VOP_BWRITE(bp); 1781 while (lfs_gatherblock(sp, bp, NULL)) 1782 continue; 1783 } 1784 1785 nestiobuf_done(mbp, skipbytes, error); 1786 if (skipbytes) { 1787 UVMHIST_LOG(ubchist, "skipbytes %d", skipbytes, 0,0,0); 1788 } 1789 UVMHIST_LOG(ubchist, "returning 0", 0,0,0,0); 1790 return (0); 1791 1792 tryagain: 1793 /* 1794 * We can't write the pages, for whatever reason. 1795 * Clean up after ourselves, and make the caller try again. 1796 */ 1797 mutex_enter(&vp->v_interlock); 1798 1799 /* Tell why we're here, if we know */ 1800 if (ip->i_lfs_iflags & LFSI_NO_GOP_WRITE) { 1801 DLOG((DLOG_PAGE, "lfs_gop_write: clean pages dirtied\n")); 1802 } else if ((pgs[0]->offset & fs->lfs_bmask) != 0) { 1803 DLOG((DLOG_PAGE, "lfs_gop_write: not on block boundary\n")); 1804 } else if (haveeof && startoffset >= eof) { 1805 DLOG((DLOG_PAGE, "lfs_gop_write: ino %d start 0x%" PRIx64 1806 " eof 0x%" PRIx64 " npages=%d\n", VTOI(vp)->i_number, 1807 pgs[0]->offset, eof, npages)); 1808 } else if (LFS_STARVED_FOR_SEGS(fs)) { 1809 DLOG((DLOG_PAGE, "lfs_gop_write: avail too low\n")); 1810 } else { 1811 DLOG((DLOG_PAGE, "lfs_gop_write: seglock not held\n")); 1812 } 1813 1814 mutex_enter(&uvm_pageqlock); 1815 for (i = 0; i < npages; i++) { 1816 pg = pgs[i]; 1817 1818 if (pg->flags & PG_PAGEOUT) 1819 uvm_pageout_done(1); 1820 if (pg->flags & PG_DELWRI) { 1821 uvm_pageunwire(pg); 1822 } 1823 uvm_pageactivate(pg); 1824 pg->flags &= ~(PG_CLEAN|PG_DELWRI|PG_PAGEOUT|PG_RELEASED); 1825 DLOG((DLOG_PAGE, "pg[%d] = %p (vp %p off %" PRIx64 ")\n", i, pg, 1826 vp, pg->offset)); 1827 DLOG((DLOG_PAGE, "pg[%d]->flags = %x\n", i, pg->flags)); 1828 DLOG((DLOG_PAGE, "pg[%d]->pqflags = %x\n", i, pg->pqflags)); 1829 DLOG((DLOG_PAGE, "pg[%d]->uanon = %p\n", i, pg->uanon)); 1830 DLOG((DLOG_PAGE, "pg[%d]->uobject = %p\n", i, pg->uobject)); 1831 DLOG((DLOG_PAGE, "pg[%d]->wire_count = %d\n", i, 1832 pg->wire_count)); 1833 DLOG((DLOG_PAGE, "pg[%d]->loan_count = %d\n", i, 1834 pg->loan_count)); 1835 } 1836 /* uvm_pageunbusy takes care of PG_BUSY, PG_WANTED */ 1837 uvm_page_unbusy(pgs, npages); 1838 mutex_exit(&uvm_pageqlock); 1839 mutex_exit(&vp->v_interlock); 1840 return EAGAIN; 1841 } 1842 1843 /* 1844 * finish vnode/inode initialization. 1845 * used by lfs_vget and lfs_fastvget. 1846 */ 1847 void 1848 lfs_vinit(struct mount *mp, struct vnode **vpp) 1849 { 1850 struct vnode *vp = *vpp; 1851 struct inode *ip = VTOI(vp); 1852 struct ufsmount *ump = VFSTOUFS(mp); 1853 struct lfs *fs = ump->um_lfs; 1854 int i; 1855 1856 ip->i_mode = ip->i_ffs1_mode; 1857 ip->i_nlink = ip->i_ffs1_nlink; 1858 ip->i_lfs_osize = ip->i_size = ip->i_ffs1_size; 1859 ip->i_flags = ip->i_ffs1_flags; 1860 ip->i_gen = ip->i_ffs1_gen; 1861 ip->i_uid = ip->i_ffs1_uid; 1862 ip->i_gid = ip->i_ffs1_gid; 1863 1864 ip->i_lfs_effnblks = ip->i_ffs1_blocks; 1865 ip->i_lfs_odnlink = ip->i_ffs1_nlink; 1866 1867 /* 1868 * Initialize the vnode from the inode, check for aliases. In all 1869 * cases re-init ip, the underlying vnode/inode may have changed. 1870 */ 1871 ufs_vinit(mp, lfs_specop_p, lfs_fifoop_p, &vp); 1872 ip = VTOI(vp); 1873 1874 memset(ip->i_lfs_fragsize, 0, NDADDR * sizeof(*ip->i_lfs_fragsize)); 1875 if (vp->v_type != VLNK || ip->i_size >= ip->i_ump->um_maxsymlinklen) { 1876 #ifdef DEBUG 1877 for (i = (ip->i_size + fs->lfs_bsize - 1) >> fs->lfs_bshift; 1878 i < NDADDR; i++) { 1879 if ((vp->v_type == VBLK || vp->v_type == VCHR) && 1880 i == 0) 1881 continue; 1882 if (ip->i_ffs1_db[i] != 0) { 1883 inconsistent: 1884 lfs_dump_dinode(ip->i_din.ffs1_din); 1885 panic("inconsistent inode"); 1886 } 1887 } 1888 for ( ; i < NDADDR + NIADDR; i++) { 1889 if (ip->i_ffs1_ib[i - NDADDR] != 0) { 1890 goto inconsistent; 1891 } 1892 } 1893 #endif /* DEBUG */ 1894 for (i = 0; i < NDADDR; i++) 1895 if (ip->i_ffs1_db[i] != 0) 1896 ip->i_lfs_fragsize[i] = blksize(fs, ip, i); 1897 } 1898 1899 #ifdef DIAGNOSTIC 1900 if (vp->v_type == VNON) { 1901 # ifdef DEBUG 1902 lfs_dump_dinode(ip->i_din.ffs1_din); 1903 # endif 1904 panic("lfs_vinit: ino %llu is type VNON! (ifmt=%o)\n", 1905 (unsigned long long)ip->i_number, 1906 (ip->i_mode & IFMT) >> 12); 1907 } 1908 #endif /* DIAGNOSTIC */ 1909 1910 /* 1911 * Finish inode initialization now that aliasing has been resolved. 1912 */ 1913 1914 ip->i_devvp = ump->um_devvp; 1915 VREF(ip->i_devvp); 1916 genfs_node_init(vp, &lfs_genfsops); 1917 uvm_vnp_setsize(vp, ip->i_size); 1918 1919 /* Initialize hiblk from file size */ 1920 ip->i_lfs_hiblk = lblkno(ip->i_lfs, ip->i_size + ip->i_lfs->lfs_bsize - 1) - 1; 1921 1922 *vpp = vp; 1923 } 1924 1925 /* 1926 * Resize the filesystem to contain the specified number of segments. 1927 */ 1928 int 1929 lfs_resize_fs(struct lfs *fs, int newnsegs) 1930 { 1931 SEGUSE *sup; 1932 struct buf *bp, *obp; 1933 daddr_t olast, nlast, ilast, noff, start, end; 1934 struct vnode *ivp; 1935 struct inode *ip; 1936 int error, badnews, inc, oldnsegs; 1937 int sbbytes, csbbytes, gain, cgain; 1938 int i; 1939 1940 /* Only support v2 and up */ 1941 if (fs->lfs_version < 2) 1942 return EOPNOTSUPP; 1943 1944 /* If we're doing nothing, do it fast */ 1945 oldnsegs = fs->lfs_nseg; 1946 if (newnsegs == oldnsegs) 1947 return 0; 1948 1949 /* We always have to have two superblocks */ 1950 if (newnsegs <= dtosn(fs, fs->lfs_sboffs[1])) 1951 return EFBIG; 1952 1953 ivp = fs->lfs_ivnode; 1954 ip = VTOI(ivp); 1955 error = 0; 1956 1957 /* Take the segment lock so no one else calls lfs_newseg() */ 1958 lfs_seglock(fs, SEGM_PROT); 1959 1960 /* 1961 * Make sure the segments we're going to be losing, if any, 1962 * are in fact empty. We hold the seglock, so their status 1963 * cannot change underneath us. Count the superblocks we lose, 1964 * while we're at it. 1965 */ 1966 sbbytes = csbbytes = 0; 1967 cgain = 0; 1968 for (i = newnsegs; i < oldnsegs; i++) { 1969 LFS_SEGENTRY(sup, fs, i, bp); 1970 badnews = sup->su_nbytes || !(sup->su_flags & SEGUSE_INVAL); 1971 if (sup->su_flags & SEGUSE_SUPERBLOCK) 1972 sbbytes += LFS_SBPAD; 1973 if (!(sup->su_flags & SEGUSE_DIRTY)) { 1974 ++cgain; 1975 if (sup->su_flags & SEGUSE_SUPERBLOCK) 1976 csbbytes += LFS_SBPAD; 1977 } 1978 brelse(bp, 0); 1979 if (badnews) { 1980 error = EBUSY; 1981 goto out; 1982 } 1983 } 1984 1985 /* Note old and new segment table endpoints, and old ifile size */ 1986 olast = fs->lfs_cleansz + fs->lfs_segtabsz; 1987 nlast = howmany(newnsegs, fs->lfs_sepb) + fs->lfs_cleansz; 1988 ilast = ivp->v_size >> fs->lfs_bshift; 1989 noff = nlast - olast; 1990 1991 /* 1992 * Make sure no one can use the Ifile while we change it around. 1993 * Even after taking the iflock we need to make sure no one still 1994 * is holding Ifile buffers, so we get each one, to drain them. 1995 * (XXX this could be done better.) 1996 */ 1997 rw_enter(&fs->lfs_iflock, RW_WRITER); 1998 vn_lock(ivp, LK_EXCLUSIVE | LK_RETRY); 1999 for (i = 0; i < ilast; i++) { 2000 bread(ivp, i, fs->lfs_bsize, NOCRED, 0, &bp); 2001 brelse(bp, 0); 2002 } 2003 2004 /* Allocate new Ifile blocks */ 2005 for (i = ilast; i < ilast + noff; i++) { 2006 if (lfs_balloc(ivp, i * fs->lfs_bsize, fs->lfs_bsize, NOCRED, 0, 2007 &bp) != 0) 2008 panic("balloc extending ifile"); 2009 memset(bp->b_data, 0, fs->lfs_bsize); 2010 VOP_BWRITE(bp); 2011 } 2012 2013 /* Register new ifile size */ 2014 ip->i_size += noff * fs->lfs_bsize; 2015 ip->i_ffs1_size = ip->i_size; 2016 uvm_vnp_setsize(ivp, ip->i_size); 2017 2018 /* Copy the inode table to its new position */ 2019 if (noff != 0) { 2020 if (noff < 0) { 2021 start = nlast; 2022 end = ilast + noff; 2023 inc = 1; 2024 } else { 2025 start = ilast + noff - 1; 2026 end = nlast - 1; 2027 inc = -1; 2028 } 2029 for (i = start; i != end; i += inc) { 2030 if (bread(ivp, i, fs->lfs_bsize, NOCRED, 2031 B_MODIFY, &bp) != 0) 2032 panic("resize: bread dst blk failed"); 2033 if (bread(ivp, i - noff, fs->lfs_bsize, 2034 NOCRED, 0, &obp)) 2035 panic("resize: bread src blk failed"); 2036 memcpy(bp->b_data, obp->b_data, fs->lfs_bsize); 2037 VOP_BWRITE(bp); 2038 brelse(obp, 0); 2039 } 2040 } 2041 2042 /* If we are expanding, write the new empty SEGUSE entries */ 2043 if (newnsegs > oldnsegs) { 2044 for (i = oldnsegs; i < newnsegs; i++) { 2045 if ((error = bread(ivp, i / fs->lfs_sepb + 2046 fs->lfs_cleansz, fs->lfs_bsize, 2047 NOCRED, B_MODIFY, &bp)) != 0) 2048 panic("lfs: ifile read: %d", error); 2049 while ((i + 1) % fs->lfs_sepb && i < newnsegs) { 2050 sup = &((SEGUSE *)bp->b_data)[i % fs->lfs_sepb]; 2051 memset(sup, 0, sizeof(*sup)); 2052 i++; 2053 } 2054 VOP_BWRITE(bp); 2055 } 2056 } 2057 2058 /* Zero out unused superblock offsets */ 2059 for (i = 2; i < LFS_MAXNUMSB; i++) 2060 if (dtosn(fs, fs->lfs_sboffs[i]) >= newnsegs) 2061 fs->lfs_sboffs[i] = 0x0; 2062 2063 /* 2064 * Correct superblock entries that depend on fs size. 2065 * The computations of these are as follows: 2066 * 2067 * size = segtod(fs, nseg) 2068 * dsize = segtod(fs, nseg - minfreeseg) - btofsb(#super * LFS_SBPAD) 2069 * bfree = dsize - btofsb(fs, bsize * nseg / 2) - blocks_actually_used 2070 * avail = segtod(fs, nclean) - btofsb(#clean_super * LFS_SBPAD) 2071 * + (segtod(fs, 1) - (offset - curseg)) 2072 * - segtod(fs, minfreeseg - (minfreeseg / 2)) 2073 * 2074 * XXX - we should probably adjust minfreeseg as well. 2075 */ 2076 gain = (newnsegs - oldnsegs); 2077 fs->lfs_nseg = newnsegs; 2078 fs->lfs_segtabsz = nlast - fs->lfs_cleansz; 2079 fs->lfs_size += gain * btofsb(fs, fs->lfs_ssize); 2080 fs->lfs_dsize += gain * btofsb(fs, fs->lfs_ssize) - btofsb(fs, sbbytes); 2081 fs->lfs_bfree += gain * btofsb(fs, fs->lfs_ssize) - btofsb(fs, sbbytes) 2082 - gain * btofsb(fs, fs->lfs_bsize / 2); 2083 if (gain > 0) { 2084 fs->lfs_nclean += gain; 2085 fs->lfs_avail += gain * btofsb(fs, fs->lfs_ssize); 2086 } else { 2087 fs->lfs_nclean -= cgain; 2088 fs->lfs_avail -= cgain * btofsb(fs, fs->lfs_ssize) - 2089 btofsb(fs, csbbytes); 2090 } 2091 2092 /* Resize segment flag cache */ 2093 fs->lfs_suflags[0] = (u_int32_t *)realloc(fs->lfs_suflags[0], 2094 fs->lfs_nseg * sizeof(u_int32_t), 2095 M_SEGMENT, M_WAITOK); 2096 fs->lfs_suflags[1] = (u_int32_t *)realloc(fs->lfs_suflags[1], 2097 fs->lfs_nseg * sizeof(u_int32_t), 2098 M_SEGMENT, M_WAITOK); 2099 for (i = oldnsegs; i < newnsegs; i++) 2100 fs->lfs_suflags[0][i] = fs->lfs_suflags[1][i] = 0x0; 2101 2102 /* Truncate Ifile if necessary */ 2103 if (noff < 0) 2104 lfs_truncate(ivp, ivp->v_size + (noff << fs->lfs_bshift), 0, 2105 NOCRED); 2106 2107 /* Update cleaner info so the cleaner can die */ 2108 bread(ivp, 0, fs->lfs_bsize, NOCRED, B_MODIFY, &bp); 2109 ((CLEANERINFO *)bp->b_data)->clean = fs->lfs_nclean; 2110 ((CLEANERINFO *)bp->b_data)->dirty = fs->lfs_nseg - fs->lfs_nclean; 2111 VOP_BWRITE(bp); 2112 2113 /* Let Ifile accesses proceed */ 2114 VOP_UNLOCK(ivp, 0); 2115 rw_exit(&fs->lfs_iflock); 2116 2117 out: 2118 lfs_segunlock(fs); 2119 return error; 2120 } 2121