1 /* $NetBSD: lfs_vfsops.c,v 1.272 2009/04/04 10:33:59 ad 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 1.272 2009/04/04 10:33:59 ad 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 nameidata nd; 557 struct vnode *devvp; 558 struct ufs_args *args = data; 559 struct ufsmount *ump = NULL; 560 struct lfs *fs = NULL; /* LFS */ 561 int error = 0, update; 562 mode_t accessmode; 563 564 if (*data_len < sizeof *args) 565 return EINVAL; 566 567 if (mp->mnt_flag & MNT_GETARGS) { 568 ump = VFSTOUFS(mp); 569 if (ump == NULL) 570 return EIO; 571 args->fspec = NULL; 572 *data_len = sizeof *args; 573 return 0; 574 } 575 576 update = mp->mnt_flag & MNT_UPDATE; 577 578 /* Check arguments */ 579 if (args->fspec != NULL) { 580 /* 581 * Look up the name and verify that it's sane. 582 */ 583 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, args->fspec); 584 if ((error = namei(&nd)) != 0) 585 return (error); 586 devvp = nd.ni_vp; 587 588 if (!update) { 589 /* 590 * Be sure this is a valid block device 591 */ 592 if (devvp->v_type != VBLK) 593 error = ENOTBLK; 594 else if (bdevsw_lookup(devvp->v_rdev) == NULL) 595 error = ENXIO; 596 } else { 597 /* 598 * Be sure we're still naming the same device 599 * used for our initial mount 600 */ 601 ump = VFSTOUFS(mp); 602 if (devvp != ump->um_devvp) 603 error = EINVAL; 604 } 605 } else { 606 if (!update) { 607 /* New mounts must have a filename for the device */ 608 return (EINVAL); 609 } else { 610 /* Use the extant mount */ 611 ump = VFSTOUFS(mp); 612 devvp = ump->um_devvp; 613 vref(devvp); 614 } 615 } 616 617 618 /* 619 * If mount by non-root, then verify that user has necessary 620 * permissions on the device. 621 */ 622 if (error == 0 && kauth_authorize_generic(l->l_cred, 623 KAUTH_GENERIC_ISSUSER, NULL) != 0) { 624 accessmode = VREAD; 625 if (update ? 626 (mp->mnt_iflag & IMNT_WANTRDWR) != 0 : 627 (mp->mnt_flag & MNT_RDONLY) == 0) 628 accessmode |= VWRITE; 629 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 630 error = VOP_ACCESS(devvp, accessmode, l->l_cred); 631 VOP_UNLOCK(devvp, 0); 632 } 633 634 if (error) { 635 vrele(devvp); 636 return (error); 637 } 638 639 if (!update) { 640 int flags; 641 642 if (mp->mnt_flag & MNT_RDONLY) 643 flags = FREAD; 644 else 645 flags = FREAD|FWRITE; 646 error = VOP_OPEN(devvp, flags, FSCRED); 647 if (error) 648 goto fail; 649 error = lfs_mountfs(devvp, mp, l); /* LFS */ 650 if (error) { 651 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 652 (void)VOP_CLOSE(devvp, flags, NOCRED); 653 VOP_UNLOCK(devvp, 0); 654 goto fail; 655 } 656 657 ump = VFSTOUFS(mp); 658 fs = ump->um_lfs; 659 } else { 660 /* 661 * Update the mount. 662 */ 663 664 /* 665 * The initial mount got a reference on this 666 * device, so drop the one obtained via 667 * namei(), above. 668 */ 669 vrele(devvp); 670 671 ump = VFSTOUFS(mp); 672 fs = ump->um_lfs; 673 if (fs->lfs_ronly && (mp->mnt_iflag & IMNT_WANTRDWR)) { 674 /* 675 * Changing from read-only to read/write. 676 * Note in the superblocks that we're writing. 677 */ 678 fs->lfs_ronly = 0; 679 if (fs->lfs_pflags & LFS_PF_CLEAN) { 680 fs->lfs_pflags &= ~LFS_PF_CLEAN; 681 lfs_writesuper(fs, fs->lfs_sboffs[0]); 682 lfs_writesuper(fs, fs->lfs_sboffs[1]); 683 } 684 } 685 if (args->fspec == NULL) 686 return EINVAL; 687 } 688 689 error = set_statvfs_info(path, UIO_USERSPACE, args->fspec, 690 UIO_USERSPACE, mp->mnt_op->vfs_name, mp, l); 691 if (error == 0) 692 (void)strncpy(fs->lfs_fsmnt, mp->mnt_stat.f_mntonname, 693 sizeof(fs->lfs_fsmnt)); 694 return error; 695 696 fail: 697 vrele(devvp); 698 return (error); 699 } 700 701 702 /* 703 * Common code for mount and mountroot 704 * LFS specific 705 */ 706 int 707 lfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l) 708 { 709 struct dlfs *tdfs, *dfs, *adfs; 710 struct lfs *fs; 711 struct ufsmount *ump; 712 struct vnode *vp; 713 struct buf *bp, *abp; 714 struct partinfo dpart; 715 dev_t dev; 716 int error, i, ronly, secsize, fsbsize; 717 kauth_cred_t cred; 718 CLEANERINFO *cip; 719 SEGUSE *sup; 720 daddr_t sb_addr; 721 722 cred = l ? l->l_cred : NOCRED; 723 724 /* 725 * Flush out any old buffers remaining from a previous use. 726 */ 727 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 728 error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0); 729 VOP_UNLOCK(devvp, 0); 730 if (error) 731 return (error); 732 733 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 734 if (VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, cred) != 0) 735 secsize = DEV_BSIZE; 736 else 737 secsize = dpart.disklab->d_secsize; 738 739 /* Don't free random space on error. */ 740 bp = NULL; 741 abp = NULL; 742 ump = NULL; 743 744 sb_addr = LFS_LABELPAD / secsize; 745 while (1) { 746 /* Read in the superblock. */ 747 error = bread(devvp, sb_addr, LFS_SBPAD, cred, 0, &bp); 748 if (error) 749 goto out; 750 dfs = (struct dlfs *)bp->b_data; 751 752 /* Check the basics. */ 753 if (dfs->dlfs_magic != LFS_MAGIC || dfs->dlfs_bsize > MAXBSIZE || 754 dfs->dlfs_version > LFS_VERSION || 755 dfs->dlfs_bsize < sizeof(struct dlfs)) { 756 DLOG((DLOG_MOUNT, "lfs_mountfs: primary superblock sanity failed\n")); 757 error = EINVAL; /* XXX needs translation */ 758 goto out; 759 } 760 if (dfs->dlfs_inodefmt > LFS_MAXINODEFMT) { 761 DLOG((DLOG_MOUNT, "lfs_mountfs: unknown inode format %d\n", 762 dfs->dlfs_inodefmt)); 763 error = EINVAL; 764 goto out; 765 } 766 767 if (dfs->dlfs_version == 1) 768 fsbsize = secsize; 769 else { 770 fsbsize = 1 << (dfs->dlfs_bshift - dfs->dlfs_blktodb + 771 dfs->dlfs_fsbtodb); 772 /* 773 * Could be, if the frag size is large enough, that we 774 * don't have the "real" primary superblock. If that's 775 * the case, get the real one, and try again. 776 */ 777 if (sb_addr != dfs->dlfs_sboffs[0] << 778 dfs->dlfs_fsbtodb) { 779 DLOG((DLOG_MOUNT, "lfs_mountfs: sb daddr" 780 " 0x%llx is not right, trying 0x%llx\n", 781 (long long)sb_addr, 782 (long long)(dfs->dlfs_sboffs[0] << 783 dfs->dlfs_fsbtodb))); 784 sb_addr = dfs->dlfs_sboffs[0] << 785 dfs->dlfs_fsbtodb; 786 brelse(bp, 0); 787 continue; 788 } 789 } 790 break; 791 } 792 793 /* 794 * Check the second superblock to see which is newer; then mount 795 * using the older of the two. This is necessary to ensure that 796 * the filesystem is valid if it was not unmounted cleanly. 797 */ 798 799 if (dfs->dlfs_sboffs[1] && 800 dfs->dlfs_sboffs[1] - LFS_LABELPAD / fsbsize > LFS_SBPAD / fsbsize) 801 { 802 error = bread(devvp, dfs->dlfs_sboffs[1] * (fsbsize / secsize), 803 LFS_SBPAD, cred, 0, &abp); 804 if (error) 805 goto out; 806 adfs = (struct dlfs *)abp->b_data; 807 808 if (dfs->dlfs_version == 1) { 809 /* 1s resolution comparison */ 810 if (adfs->dlfs_tstamp < dfs->dlfs_tstamp) 811 tdfs = adfs; 812 else 813 tdfs = dfs; 814 } else { 815 /* monotonic infinite-resolution comparison */ 816 if (adfs->dlfs_serial < dfs->dlfs_serial) 817 tdfs = adfs; 818 else 819 tdfs = dfs; 820 } 821 822 /* Check the basics. */ 823 if (tdfs->dlfs_magic != LFS_MAGIC || 824 tdfs->dlfs_bsize > MAXBSIZE || 825 tdfs->dlfs_version > LFS_VERSION || 826 tdfs->dlfs_bsize < sizeof(struct dlfs)) { 827 DLOG((DLOG_MOUNT, "lfs_mountfs: alt superblock" 828 " sanity failed\n")); 829 error = EINVAL; /* XXX needs translation */ 830 goto out; 831 } 832 } else { 833 DLOG((DLOG_MOUNT, "lfs_mountfs: invalid alt superblock" 834 " daddr=0x%x\n", dfs->dlfs_sboffs[1])); 835 error = EINVAL; 836 goto out; 837 } 838 839 /* Allocate the mount structure, copy the superblock into it. */ 840 fs = malloc(sizeof(struct lfs), M_UFSMNT, M_WAITOK | M_ZERO); 841 memcpy(&fs->lfs_dlfs, tdfs, sizeof(struct dlfs)); 842 843 /* Compatibility */ 844 if (fs->lfs_version < 2) { 845 fs->lfs_sumsize = LFS_V1_SUMMARY_SIZE; 846 fs->lfs_ibsize = fs->lfs_bsize; 847 fs->lfs_start = fs->lfs_sboffs[0]; 848 fs->lfs_tstamp = fs->lfs_otstamp; 849 fs->lfs_fsbtodb = 0; 850 } 851 if (fs->lfs_resvseg == 0) 852 fs->lfs_resvseg = MIN(fs->lfs_minfreeseg - 1, \ 853 MAX(MIN_RESV_SEGS, fs->lfs_minfreeseg / 2 + 1)); 854 855 /* 856 * If we aren't going to be able to write meaningfully to this 857 * filesystem, and were not mounted readonly, bomb out now. 858 */ 859 if (fsbtob(fs, LFS_NRESERVE(fs)) > LFS_MAX_BYTES && !ronly) { 860 DLOG((DLOG_MOUNT, "lfs_mount: to mount this filesystem read/write," 861 " we need BUFPAGES >= %lld\n", 862 (long long)((bufmem_hiwater / bufmem_lowater) * 863 LFS_INVERSE_MAX_BYTES( 864 fsbtob(fs, LFS_NRESERVE(fs))) >> PAGE_SHIFT))); 865 free(fs, M_UFSMNT); 866 error = EFBIG; /* XXX needs translation */ 867 goto out; 868 } 869 870 /* Before rolling forward, lock so vget will sleep for other procs */ 871 if (l != NULL) { 872 fs->lfs_flags = LFS_NOTYET; 873 fs->lfs_rfpid = l->l_proc->p_pid; 874 } 875 876 ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK | M_ZERO); 877 ump->um_lfs = fs; 878 ump->um_ops = &lfs_ufsops; 879 ump->um_fstype = UFS1; 880 if (sizeof(struct lfs) < LFS_SBPAD) { /* XXX why? */ 881 brelse(bp, BC_INVAL); 882 brelse(abp, BC_INVAL); 883 } else { 884 brelse(bp, 0); 885 brelse(abp, 0); 886 } 887 bp = NULL; 888 abp = NULL; 889 890 891 /* Set up the I/O information */ 892 fs->lfs_devbsize = secsize; 893 fs->lfs_iocount = 0; 894 fs->lfs_diropwait = 0; 895 fs->lfs_activesb = 0; 896 fs->lfs_uinodes = 0; 897 fs->lfs_ravail = 0; 898 fs->lfs_favail = 0; 899 fs->lfs_sbactive = 0; 900 901 /* Set up the ifile and lock aflags */ 902 fs->lfs_doifile = 0; 903 fs->lfs_writer = 0; 904 fs->lfs_dirops = 0; 905 fs->lfs_nadirop = 0; 906 fs->lfs_seglock = 0; 907 fs->lfs_pdflush = 0; 908 fs->lfs_sleepers = 0; 909 fs->lfs_pages = 0; 910 rw_init(&fs->lfs_fraglock); 911 rw_init(&fs->lfs_iflock); 912 cv_init(&fs->lfs_stopcv, "lfsstop"); 913 914 /* Set the file system readonly/modify bits. */ 915 fs->lfs_ronly = ronly; 916 if (ronly == 0) 917 fs->lfs_fmod = 1; 918 919 /* Initialize the mount structure. */ 920 dev = devvp->v_rdev; 921 mp->mnt_data = ump; 922 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 923 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_LFS); 924 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 925 mp->mnt_stat.f_namemax = LFS_MAXNAMLEN; 926 mp->mnt_stat.f_iosize = fs->lfs_bsize; 927 mp->mnt_flag |= MNT_LOCAL; 928 mp->mnt_fs_bshift = fs->lfs_bshift; 929 ump->um_flags = 0; 930 ump->um_mountp = mp; 931 ump->um_dev = dev; 932 ump->um_devvp = devvp; 933 ump->um_bptrtodb = fs->lfs_fsbtodb; 934 ump->um_seqinc = fragstofsb(fs, fs->lfs_frag); 935 ump->um_nindir = fs->lfs_nindir; 936 ump->um_lognindir = ffs(fs->lfs_nindir) - 1; 937 for (i = 0; i < MAXQUOTAS; i++) 938 ump->um_quotas[i] = NULLVP; 939 ump->um_maxsymlinklen = fs->lfs_maxsymlinklen; 940 ump->um_dirblksiz = DIRBLKSIZ; 941 ump->um_maxfilesize = fs->lfs_maxfilesize; 942 if (ump->um_maxsymlinklen > 0) 943 mp->mnt_iflag |= IMNT_DTYPE; 944 devvp->v_specmountpoint = mp; 945 946 /* Set up reserved memory for pageout */ 947 lfs_setup_resblks(fs); 948 /* Set up vdirop tailq */ 949 TAILQ_INIT(&fs->lfs_dchainhd); 950 /* and paging tailq */ 951 TAILQ_INIT(&fs->lfs_pchainhd); 952 /* and delayed segment accounting for truncation list */ 953 LIST_INIT(&fs->lfs_segdhd); 954 955 /* 956 * We use the ifile vnode for almost every operation. Instead of 957 * retrieving it from the hash table each time we retrieve it here, 958 * artificially increment the reference count and keep a pointer 959 * to it in the incore copy of the superblock. 960 */ 961 if ((error = VFS_VGET(mp, LFS_IFILE_INUM, &vp)) != 0) { 962 DLOG((DLOG_MOUNT, "lfs_mountfs: ifile vget failed, error=%d\n", error)); 963 goto out; 964 } 965 fs->lfs_ivnode = vp; 966 VREF(vp); 967 968 /* Set up inode bitmap and order free list */ 969 lfs_order_freelist(fs); 970 971 /* Set up segment usage flags for the autocleaner. */ 972 fs->lfs_nactive = 0; 973 fs->lfs_suflags = (u_int32_t **)malloc(2 * sizeof(u_int32_t *), 974 M_SEGMENT, M_WAITOK); 975 fs->lfs_suflags[0] = (u_int32_t *)malloc(fs->lfs_nseg * sizeof(u_int32_t), 976 M_SEGMENT, M_WAITOK); 977 fs->lfs_suflags[1] = (u_int32_t *)malloc(fs->lfs_nseg * sizeof(u_int32_t), 978 M_SEGMENT, M_WAITOK); 979 memset(fs->lfs_suflags[1], 0, fs->lfs_nseg * sizeof(u_int32_t)); 980 for (i = 0; i < fs->lfs_nseg; i++) { 981 int changed; 982 983 LFS_SEGENTRY(sup, fs, i, bp); 984 changed = 0; 985 if (!ronly) { 986 if (sup->su_nbytes == 0 && 987 !(sup->su_flags & SEGUSE_EMPTY)) { 988 sup->su_flags |= SEGUSE_EMPTY; 989 ++changed; 990 } else if (!(sup->su_nbytes == 0) && 991 (sup->su_flags & SEGUSE_EMPTY)) { 992 sup->su_flags &= ~SEGUSE_EMPTY; 993 ++changed; 994 } 995 if (sup->su_flags & (SEGUSE_ACTIVE|SEGUSE_INVAL)) { 996 sup->su_flags &= ~(SEGUSE_ACTIVE|SEGUSE_INVAL); 997 ++changed; 998 } 999 } 1000 fs->lfs_suflags[0][i] = sup->su_flags; 1001 if (changed) 1002 LFS_WRITESEGENTRY(sup, fs, i, bp); 1003 else 1004 brelse(bp, 0); 1005 } 1006 1007 #ifdef LFS_KERNEL_RFW 1008 lfs_roll_forward(fs, mp, l); 1009 #endif 1010 1011 /* If writing, sb is not clean; record in case of immediate crash */ 1012 if (!fs->lfs_ronly) { 1013 fs->lfs_pflags &= ~LFS_PF_CLEAN; 1014 lfs_writesuper(fs, fs->lfs_sboffs[0]); 1015 lfs_writesuper(fs, fs->lfs_sboffs[1]); 1016 } 1017 1018 /* Allow vget now that roll-forward is complete */ 1019 fs->lfs_flags &= ~(LFS_NOTYET); 1020 wakeup(&fs->lfs_flags); 1021 1022 /* 1023 * Initialize the ifile cleaner info with information from 1024 * the superblock. 1025 */ 1026 LFS_CLEANERINFO(cip, fs, bp); 1027 cip->clean = fs->lfs_nclean; 1028 cip->dirty = fs->lfs_nseg - fs->lfs_nclean; 1029 cip->avail = fs->lfs_avail; 1030 cip->bfree = fs->lfs_bfree; 1031 (void) LFS_BWRITE_LOG(bp); /* Ifile */ 1032 1033 /* 1034 * Mark the current segment as ACTIVE, since we're going to 1035 * be writing to it. 1036 */ 1037 LFS_SEGENTRY(sup, fs, dtosn(fs, fs->lfs_offset), bp); 1038 sup->su_flags |= SEGUSE_DIRTY | SEGUSE_ACTIVE; 1039 fs->lfs_nactive++; 1040 LFS_WRITESEGENTRY(sup, fs, dtosn(fs, fs->lfs_offset), bp); /* Ifile */ 1041 1042 /* Now that roll-forward is done, unlock the Ifile */ 1043 vput(vp); 1044 1045 /* Start the pagedaemon-anticipating daemon */ 1046 if (lfs_writer_daemon == 0 && kthread_create(PRI_BIO, 0, NULL, 1047 lfs_writerd, NULL, NULL, "lfs_writer") != 0) 1048 panic("fork lfs_writer"); 1049 1050 printf("WARNING: the log-structured file system is experimental\n" 1051 "WARNING: it may cause system crashes and/or corrupt data\n"); 1052 1053 return (0); 1054 1055 out: 1056 if (bp) 1057 brelse(bp, 0); 1058 if (abp) 1059 brelse(abp, 0); 1060 if (ump) { 1061 free(ump->um_lfs, M_UFSMNT); 1062 free(ump, M_UFSMNT); 1063 mp->mnt_data = NULL; 1064 } 1065 1066 return (error); 1067 } 1068 1069 /* 1070 * unmount system call 1071 */ 1072 int 1073 lfs_unmount(struct mount *mp, int mntflags) 1074 { 1075 struct lwp *l = curlwp; 1076 struct ufsmount *ump; 1077 struct lfs *fs; 1078 int error, flags, ronly; 1079 vnode_t *vp; 1080 1081 flags = 0; 1082 if (mntflags & MNT_FORCE) 1083 flags |= FORCECLOSE; 1084 1085 ump = VFSTOUFS(mp); 1086 fs = ump->um_lfs; 1087 1088 /* Two checkpoints */ 1089 lfs_segwrite(mp, SEGM_CKP | SEGM_SYNC); 1090 lfs_segwrite(mp, SEGM_CKP | SEGM_SYNC); 1091 1092 /* wake up the cleaner so it can die */ 1093 lfs_wakeup_cleaner(fs); 1094 mutex_enter(&lfs_lock); 1095 while (fs->lfs_sleepers) 1096 mtsleep(&fs->lfs_sleepers, PRIBIO + 1, "lfs_sleepers", 0, 1097 &lfs_lock); 1098 mutex_exit(&lfs_lock); 1099 1100 #ifdef QUOTA 1101 if (mp->mnt_flag & MNT_QUOTA) { 1102 int i; 1103 error = vflush(mp, fs->lfs_ivnode, SKIPSYSTEM|flags); 1104 if (error) 1105 return (error); 1106 for (i = 0; i < MAXQUOTAS; i++) { 1107 if (ump->um_quotas[i] == NULLVP) 1108 continue; 1109 quotaoff(l, mp, i); 1110 } 1111 /* 1112 * Here we fall through to vflush again to ensure 1113 * that we have gotten rid of all the system vnodes. 1114 */ 1115 } 1116 #endif 1117 if ((error = vflush(mp, fs->lfs_ivnode, flags)) != 0) 1118 return (error); 1119 if ((error = VFS_SYNC(mp, 1, l->l_cred)) != 0) 1120 return (error); 1121 vp = fs->lfs_ivnode; 1122 mutex_enter(&vp->v_interlock); 1123 if (LIST_FIRST(&vp->v_dirtyblkhd)) 1124 panic("lfs_unmount: still dirty blocks on ifile vnode"); 1125 mutex_exit(&vp->v_interlock); 1126 1127 /* Explicitly write the superblock, to update serial and pflags */ 1128 fs->lfs_pflags |= LFS_PF_CLEAN; 1129 lfs_writesuper(fs, fs->lfs_sboffs[0]); 1130 lfs_writesuper(fs, fs->lfs_sboffs[1]); 1131 mutex_enter(&lfs_lock); 1132 while (fs->lfs_iocount) 1133 mtsleep(&fs->lfs_iocount, PRIBIO + 1, "lfs_umount", 0, 1134 &lfs_lock); 1135 mutex_exit(&lfs_lock); 1136 1137 /* Finish with the Ifile, now that we're done with it */ 1138 vgone(fs->lfs_ivnode); 1139 1140 ronly = !fs->lfs_ronly; 1141 if (ump->um_devvp->v_type != VBAD) 1142 ump->um_devvp->v_specmountpoint = NULL; 1143 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 1144 error = VOP_CLOSE(ump->um_devvp, 1145 ronly ? FREAD : FREAD|FWRITE, NOCRED); 1146 vput(ump->um_devvp); 1147 1148 /* Complain about page leakage */ 1149 if (fs->lfs_pages > 0) 1150 printf("lfs_unmount: still claim %d pages (%d in subsystem)\n", 1151 fs->lfs_pages, lfs_subsys_pages); 1152 1153 /* Free per-mount data structures */ 1154 free(fs->lfs_ino_bitmap, M_SEGMENT); 1155 free(fs->lfs_suflags[0], M_SEGMENT); 1156 free(fs->lfs_suflags[1], M_SEGMENT); 1157 free(fs->lfs_suflags, M_SEGMENT); 1158 lfs_free_resblks(fs); 1159 cv_destroy(&fs->lfs_stopcv); 1160 rw_destroy(&fs->lfs_fraglock); 1161 rw_destroy(&fs->lfs_iflock); 1162 free(fs, M_UFSMNT); 1163 free(ump, M_UFSMNT); 1164 1165 mp->mnt_data = NULL; 1166 mp->mnt_flag &= ~MNT_LOCAL; 1167 return (error); 1168 } 1169 1170 /* 1171 * Get file system statistics. 1172 * 1173 * NB: We don't lock to access the superblock here, because it's not 1174 * really that important if we get it wrong. 1175 */ 1176 int 1177 lfs_statvfs(struct mount *mp, struct statvfs *sbp) 1178 { 1179 struct lfs *fs; 1180 struct ufsmount *ump; 1181 1182 ump = VFSTOUFS(mp); 1183 fs = ump->um_lfs; 1184 if (fs->lfs_magic != LFS_MAGIC) 1185 panic("lfs_statvfs: magic"); 1186 1187 sbp->f_bsize = fs->lfs_bsize; 1188 sbp->f_frsize = fs->lfs_fsize; 1189 sbp->f_iosize = fs->lfs_bsize; 1190 sbp->f_blocks = fsbtofrags(fs, LFS_EST_NONMETA(fs) - VTOI(fs->lfs_ivnode)->i_lfs_effnblks); 1191 1192 sbp->f_bfree = fsbtofrags(fs, LFS_EST_BFREE(fs)); 1193 KASSERT(sbp->f_bfree <= fs->lfs_dsize); 1194 #if 0 1195 if (sbp->f_bfree < 0) 1196 sbp->f_bfree = 0; 1197 #endif 1198 1199 sbp->f_bresvd = fsbtofrags(fs, LFS_EST_RSVD(fs)); 1200 if (sbp->f_bfree > sbp->f_bresvd) 1201 sbp->f_bavail = sbp->f_bfree - sbp->f_bresvd; 1202 else 1203 sbp->f_bavail = 0; 1204 1205 sbp->f_files = fs->lfs_bfree / btofsb(fs, fs->lfs_ibsize) * INOPB(fs); 1206 sbp->f_ffree = sbp->f_files - fs->lfs_nfiles; 1207 sbp->f_favail = sbp->f_ffree; 1208 sbp->f_fresvd = 0; 1209 copy_statvfs_info(sbp, mp); 1210 return (0); 1211 } 1212 1213 /* 1214 * Go through the disk queues to initiate sandbagged IO; 1215 * go through the inodes to write those that have been modified; 1216 * initiate the writing of the super block if it has been modified. 1217 * 1218 * Note: we are always called with the filesystem marked `MPBUSY'. 1219 */ 1220 int 1221 lfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 1222 { 1223 int error; 1224 struct lfs *fs; 1225 1226 fs = VFSTOUFS(mp)->um_lfs; 1227 if (fs->lfs_ronly) 1228 return 0; 1229 1230 /* Snapshots should not hose the syncer */ 1231 /* 1232 * XXX Sync can block here anyway, since we don't have a very 1233 * XXX good idea of how much data is pending. If it's more 1234 * XXX than a segment and lfs_nextseg is close to the end of 1235 * XXX the log, we'll likely block. 1236 */ 1237 mutex_enter(&lfs_lock); 1238 if (fs->lfs_nowrap && fs->lfs_nextseg < fs->lfs_curseg) { 1239 mutex_exit(&lfs_lock); 1240 return 0; 1241 } 1242 mutex_exit(&lfs_lock); 1243 1244 lfs_writer_enter(fs, "lfs_dirops"); 1245 1246 /* All syncs must be checkpoints until roll-forward is implemented. */ 1247 DLOG((DLOG_FLUSH, "lfs_sync at 0x%x\n", fs->lfs_offset)); 1248 error = lfs_segwrite(mp, SEGM_CKP | (waitfor ? SEGM_SYNC : 0)); 1249 lfs_writer_leave(fs); 1250 #ifdef QUOTA 1251 qsync(mp); 1252 #endif 1253 return (error); 1254 } 1255 1256 extern kmutex_t ufs_hashlock; 1257 1258 /* 1259 * Look up an LFS dinode number to find its incore vnode. If not already 1260 * in core, read it in from the specified device. Return the inode locked. 1261 * Detection and handling of mount points must be done by the calling routine. 1262 */ 1263 int 1264 lfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 1265 { 1266 struct lfs *fs; 1267 struct ufs1_dinode *dip; 1268 struct inode *ip; 1269 struct buf *bp; 1270 struct ifile *ifp; 1271 struct vnode *vp; 1272 struct ufsmount *ump; 1273 daddr_t daddr; 1274 dev_t dev; 1275 int error, retries; 1276 struct timespec ts; 1277 1278 memset(&ts, 0, sizeof ts); /* XXX gcc */ 1279 1280 ump = VFSTOUFS(mp); 1281 dev = ump->um_dev; 1282 fs = ump->um_lfs; 1283 1284 /* 1285 * If the filesystem is not completely mounted yet, suspend 1286 * any access requests (wait for roll-forward to complete). 1287 */ 1288 mutex_enter(&lfs_lock); 1289 while ((fs->lfs_flags & LFS_NOTYET) && curproc->p_pid != fs->lfs_rfpid) 1290 mtsleep(&fs->lfs_flags, PRIBIO+1, "lfs_notyet", 0, 1291 &lfs_lock); 1292 mutex_exit(&lfs_lock); 1293 1294 retry: 1295 if ((*vpp = ufs_ihashget(dev, ino, LK_EXCLUSIVE)) != NULL) 1296 return (0); 1297 1298 if ((error = getnewvnode(VT_LFS, mp, lfs_vnodeop_p, &vp)) != 0) { 1299 *vpp = NULL; 1300 return (error); 1301 } 1302 1303 mutex_enter(&ufs_hashlock); 1304 if (ufs_ihashget(dev, ino, 0) != NULL) { 1305 mutex_exit(&ufs_hashlock); 1306 ungetnewvnode(vp); 1307 goto retry; 1308 } 1309 1310 /* Translate the inode number to a disk address. */ 1311 if (ino == LFS_IFILE_INUM) 1312 daddr = fs->lfs_idaddr; 1313 else { 1314 /* XXX bounds-check this too */ 1315 LFS_IENTRY(ifp, fs, ino, bp); 1316 daddr = ifp->if_daddr; 1317 if (fs->lfs_version > 1) { 1318 ts.tv_sec = ifp->if_atime_sec; 1319 ts.tv_nsec = ifp->if_atime_nsec; 1320 } 1321 1322 brelse(bp, 0); 1323 if (daddr == LFS_UNUSED_DADDR) { 1324 *vpp = NULLVP; 1325 mutex_exit(&ufs_hashlock); 1326 ungetnewvnode(vp); 1327 return (ENOENT); 1328 } 1329 } 1330 1331 /* Allocate/init new vnode/inode. */ 1332 lfs_vcreate(mp, ino, vp); 1333 1334 /* 1335 * Put it onto its hash chain and lock it so that other requests for 1336 * this inode will block if they arrive while we are sleeping waiting 1337 * for old data structures to be purged or for the contents of the 1338 * disk portion of this inode to be read. 1339 */ 1340 ip = VTOI(vp); 1341 ufs_ihashins(ip); 1342 mutex_exit(&ufs_hashlock); 1343 1344 /* 1345 * XXX 1346 * This may not need to be here, logically it should go down with 1347 * the i_devvp initialization. 1348 * Ask Kirk. 1349 */ 1350 ip->i_lfs = ump->um_lfs; 1351 1352 /* Read in the disk contents for the inode, copy into the inode. */ 1353 retries = 0; 1354 again: 1355 error = bread(ump->um_devvp, fsbtodb(fs, daddr), 1356 (fs->lfs_version == 1 ? fs->lfs_bsize : fs->lfs_ibsize), 1357 NOCRED, 0, &bp); 1358 if (error) { 1359 /* 1360 * The inode does not contain anything useful, so it would 1361 * be misleading to leave it on its hash chain. With mode 1362 * still zero, it will be unlinked and returned to the free 1363 * list by vput(). 1364 */ 1365 vput(vp); 1366 brelse(bp, 0); 1367 *vpp = NULL; 1368 return (error); 1369 } 1370 1371 dip = lfs_ifind(fs, ino, bp); 1372 if (dip == NULL) { 1373 /* Assume write has not completed yet; try again */ 1374 brelse(bp, BC_INVAL); 1375 ++retries; 1376 if (retries > LFS_IFIND_RETRIES) { 1377 #ifdef DEBUG 1378 /* If the seglock is held look at the bpp to see 1379 what is there anyway */ 1380 mutex_enter(&lfs_lock); 1381 if (fs->lfs_seglock > 0) { 1382 struct buf **bpp; 1383 struct ufs1_dinode *dp; 1384 int i; 1385 1386 for (bpp = fs->lfs_sp->bpp; 1387 bpp != fs->lfs_sp->cbpp; ++bpp) { 1388 if ((*bpp)->b_vp == fs->lfs_ivnode && 1389 bpp != fs->lfs_sp->bpp) { 1390 /* Inode block */ 1391 printf("lfs_vget: block 0x%" PRIx64 ": ", 1392 (*bpp)->b_blkno); 1393 dp = (struct ufs1_dinode *)(*bpp)->b_data; 1394 for (i = 0; i < INOPB(fs); i++) 1395 if (dp[i].di_u.inumber) 1396 printf("%d ", dp[i].di_u.inumber); 1397 printf("\n"); 1398 } 1399 } 1400 } 1401 mutex_exit(&lfs_lock); 1402 #endif /* DEBUG */ 1403 panic("lfs_vget: dinode not found"); 1404 } 1405 mutex_enter(&lfs_lock); 1406 if (fs->lfs_iocount) { 1407 DLOG((DLOG_VNODE, "lfs_vget: dinode %d not found, retrying...\n", ino)); 1408 (void)mtsleep(&fs->lfs_iocount, PRIBIO + 1, 1409 "lfs ifind", 1, &lfs_lock); 1410 } else 1411 retries = LFS_IFIND_RETRIES; 1412 mutex_exit(&lfs_lock); 1413 goto again; 1414 } 1415 *ip->i_din.ffs1_din = *dip; 1416 brelse(bp, 0); 1417 1418 if (fs->lfs_version > 1) { 1419 ip->i_ffs1_atime = ts.tv_sec; 1420 ip->i_ffs1_atimensec = ts.tv_nsec; 1421 } 1422 1423 lfs_vinit(mp, &vp); 1424 1425 *vpp = vp; 1426 1427 KASSERT(VOP_ISLOCKED(vp)); 1428 1429 return (0); 1430 } 1431 1432 /* 1433 * File handle to vnode 1434 */ 1435 int 1436 lfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 1437 { 1438 struct lfid lfh; 1439 struct buf *bp; 1440 IFILE *ifp; 1441 int32_t daddr; 1442 struct lfs *fs; 1443 vnode_t *vp; 1444 1445 if (fhp->fid_len != sizeof(struct lfid)) 1446 return EINVAL; 1447 1448 memcpy(&lfh, fhp, sizeof(lfh)); 1449 if (lfh.lfid_ino < LFS_IFILE_INUM) 1450 return ESTALE; 1451 1452 fs = VFSTOUFS(mp)->um_lfs; 1453 if (lfh.lfid_ident != fs->lfs_ident) 1454 return ESTALE; 1455 1456 if (lfh.lfid_ino > 1457 ((VTOI(fs->lfs_ivnode)->i_ffs1_size >> fs->lfs_bshift) - 1458 fs->lfs_cleansz - fs->lfs_segtabsz) * fs->lfs_ifpb) 1459 return ESTALE; 1460 1461 mutex_enter(&ufs_ihash_lock); 1462 vp = ufs_ihashlookup(VFSTOUFS(mp)->um_dev, lfh.lfid_ino); 1463 mutex_exit(&ufs_ihash_lock); 1464 if (vp == NULL) { 1465 LFS_IENTRY(ifp, fs, lfh.lfid_ino, bp); 1466 daddr = ifp->if_daddr; 1467 brelse(bp, 0); 1468 if (daddr == LFS_UNUSED_DADDR) 1469 return ESTALE; 1470 } 1471 1472 return (ufs_fhtovp(mp, &lfh.lfid_ufid, vpp)); 1473 } 1474 1475 /* 1476 * Vnode pointer to File handle 1477 */ 1478 /* ARGSUSED */ 1479 int 1480 lfs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 1481 { 1482 struct inode *ip; 1483 struct lfid lfh; 1484 1485 if (*fh_size < sizeof(struct lfid)) { 1486 *fh_size = sizeof(struct lfid); 1487 return E2BIG; 1488 } 1489 *fh_size = sizeof(struct lfid); 1490 ip = VTOI(vp); 1491 memset(&lfh, 0, sizeof(lfh)); 1492 lfh.lfid_len = sizeof(struct lfid); 1493 lfh.lfid_ino = ip->i_number; 1494 lfh.lfid_gen = ip->i_gen; 1495 lfh.lfid_ident = ip->i_lfs->lfs_ident; 1496 memcpy(fhp, &lfh, sizeof(lfh)); 1497 return (0); 1498 } 1499 1500 /* 1501 * ufs_bmaparray callback function for writing. 1502 * 1503 * Since blocks will be written to the new segment anyway, 1504 * we don't care about current daddr of them. 1505 */ 1506 static bool 1507 lfs_issequential_hole(const struct ufsmount *ump, 1508 daddr_t daddr0, daddr_t daddr1) 1509 { 1510 daddr0 = (daddr_t)((int32_t)daddr0); /* XXX ondisk32 */ 1511 daddr1 = (daddr_t)((int32_t)daddr1); /* XXX ondisk32 */ 1512 1513 KASSERT(daddr0 == UNWRITTEN || 1514 (0 <= daddr0 && daddr0 <= LFS_MAX_DADDR)); 1515 KASSERT(daddr1 == UNWRITTEN || 1516 (0 <= daddr1 && daddr1 <= LFS_MAX_DADDR)); 1517 1518 /* NOTE: all we want to know here is 'hole or not'. */ 1519 /* NOTE: UNASSIGNED is converted to 0 by ufs_bmaparray. */ 1520 1521 /* 1522 * treat UNWRITTENs and all resident blocks as 'contiguous' 1523 */ 1524 if (daddr0 != 0 && daddr1 != 0) 1525 return true; 1526 1527 /* 1528 * both are in hole? 1529 */ 1530 if (daddr0 == 0 && daddr1 == 0) 1531 return true; /* all holes are 'contiguous' for us. */ 1532 1533 return false; 1534 } 1535 1536 /* 1537 * lfs_gop_write functions exactly like genfs_gop_write, except that 1538 * (1) it requires the seglock to be held by its caller, and sp->fip 1539 * to be properly initialized (it will return without re-initializing 1540 * sp->fip, and without calling lfs_writeseg). 1541 * (2) it uses the remaining space in the segment, rather than VOP_BMAP, 1542 * to determine how large a block it can write at once (though it does 1543 * still use VOP_BMAP to find holes in the file); 1544 * (3) it calls lfs_gatherblock instead of VOP_STRATEGY on its blocks 1545 * (leaving lfs_writeseg to deal with the cluster blocks, so we might 1546 * now have clusters of clusters, ick.) 1547 */ 1548 static int 1549 lfs_gop_write(struct vnode *vp, struct vm_page **pgs, int npages, 1550 int flags) 1551 { 1552 int i, error, run, haveeof = 0; 1553 int fs_bshift; 1554 vaddr_t kva; 1555 off_t eof, offset, startoffset = 0; 1556 size_t bytes, iobytes, skipbytes; 1557 daddr_t lbn, blkno; 1558 struct vm_page *pg; 1559 struct buf *mbp, *bp; 1560 struct vnode *devvp = VTOI(vp)->i_devvp; 1561 struct inode *ip = VTOI(vp); 1562 struct lfs *fs = ip->i_lfs; 1563 struct segment *sp = fs->lfs_sp; 1564 UVMHIST_FUNC("lfs_gop_write"); UVMHIST_CALLED(ubchist); 1565 1566 ASSERT_SEGLOCK(fs); 1567 1568 /* The Ifile lives in the buffer cache */ 1569 KASSERT(vp != fs->lfs_ivnode); 1570 1571 /* 1572 * We don't want to fill the disk before the cleaner has a chance 1573 * to make room for us. If we're in danger of doing that, fail 1574 * with EAGAIN. The caller will have to notice this, unlock 1575 * so the cleaner can run, relock and try again. 1576 * 1577 * We must write everything, however, if our vnode is being 1578 * reclaimed. 1579 */ 1580 if (LFS_STARVED_FOR_SEGS(fs) && vp != fs->lfs_flushvp) 1581 goto tryagain; 1582 1583 /* 1584 * Sometimes things slip past the filters in lfs_putpages, 1585 * and the pagedaemon tries to write pages---problem is 1586 * that the pagedaemon never acquires the segment lock. 1587 * 1588 * Alternatively, pages that were clean when we called 1589 * genfs_putpages may have become dirty in the meantime. In this 1590 * case the segment header is not properly set up for blocks 1591 * to be added to it. 1592 * 1593 * Unbusy and unclean the pages, and put them on the ACTIVE 1594 * queue under the hypothesis that they couldn't have got here 1595 * unless they were modified *quite* recently. 1596 * 1597 * XXXUBC that last statement is an oversimplification of course. 1598 */ 1599 if (!LFS_SEGLOCK_HELD(fs) || 1600 (ip->i_lfs_iflags & LFSI_NO_GOP_WRITE) || 1601 (pgs[0]->offset & fs->lfs_bmask) != 0) { 1602 goto tryagain; 1603 } 1604 1605 UVMHIST_LOG(ubchist, "vp %p pgs %p npages %d flags 0x%x", 1606 vp, pgs, npages, flags); 1607 1608 GOP_SIZE(vp, vp->v_size, &eof, 0); 1609 haveeof = 1; 1610 1611 if (vp->v_type == VREG) 1612 fs_bshift = vp->v_mount->mnt_fs_bshift; 1613 else 1614 fs_bshift = DEV_BSHIFT; 1615 error = 0; 1616 pg = pgs[0]; 1617 startoffset = pg->offset; 1618 KASSERT(eof >= 0); 1619 1620 if (startoffset >= eof) { 1621 goto tryagain; 1622 } else 1623 bytes = MIN(npages << PAGE_SHIFT, eof - startoffset); 1624 skipbytes = 0; 1625 1626 KASSERT(bytes != 0); 1627 1628 /* Swap PG_DELWRI for PG_PAGEOUT */ 1629 for (i = 0; i < npages; i++) { 1630 if (pgs[i]->flags & PG_DELWRI) { 1631 KASSERT(!(pgs[i]->flags & PG_PAGEOUT)); 1632 pgs[i]->flags &= ~PG_DELWRI; 1633 pgs[i]->flags |= PG_PAGEOUT; 1634 uvm_pageout_start(1); 1635 mutex_enter(&uvm_pageqlock); 1636 uvm_pageunwire(pgs[i]); 1637 mutex_exit(&uvm_pageqlock); 1638 } 1639 } 1640 1641 /* 1642 * Check to make sure we're starting on a block boundary. 1643 * We'll check later to make sure we always write entire 1644 * blocks (or fragments). 1645 */ 1646 if (startoffset & fs->lfs_bmask) 1647 printf("%" PRId64 " & %" PRId64 " = %" PRId64 "\n", 1648 startoffset, fs->lfs_bmask, 1649 startoffset & fs->lfs_bmask); 1650 KASSERT((startoffset & fs->lfs_bmask) == 0); 1651 if (bytes & fs->lfs_ffmask) { 1652 printf("lfs_gop_write: asked to write %ld bytes\n", (long)bytes); 1653 panic("lfs_gop_write: non-integer blocks"); 1654 } 1655 1656 /* 1657 * We could deadlock here on pager_map with UVMPAGER_MAPIN_WAITOK. 1658 * If we would, write what we have and try again. If we don't 1659 * have anything to write, we'll have to sleep. 1660 */ 1661 if ((kva = uvm_pagermapin(pgs, npages, UVMPAGER_MAPIN_WRITE | 1662 (((SEGSUM *)(sp->segsum))->ss_nfinfo < 1 ? 1663 UVMPAGER_MAPIN_WAITOK : 0))) == 0x0) { 1664 DLOG((DLOG_PAGE, "lfs_gop_write: forcing write\n")); 1665 #if 0 1666 " with nfinfo=%d at offset 0x%x\n", 1667 (int)((SEGSUM *)(sp->segsum))->ss_nfinfo, 1668 (unsigned)fs->lfs_offset)); 1669 #endif 1670 lfs_updatemeta(sp); 1671 lfs_release_finfo(fs); 1672 (void) lfs_writeseg(fs, sp); 1673 1674 lfs_acquire_finfo(fs, ip->i_number, ip->i_gen); 1675 1676 /* 1677 * Having given up all of the pager_map we were holding, 1678 * we can now wait for aiodoned to reclaim it for us 1679 * without fear of deadlock. 1680 */ 1681 kva = uvm_pagermapin(pgs, npages, UVMPAGER_MAPIN_WRITE | 1682 UVMPAGER_MAPIN_WAITOK); 1683 } 1684 1685 mutex_enter(&vp->v_interlock); 1686 vp->v_numoutput += 2; /* one for biodone, one for aiodone */ 1687 mutex_exit(&vp->v_interlock); 1688 1689 mbp = getiobuf(NULL, true); 1690 UVMHIST_LOG(ubchist, "vp %p mbp %p num now %d bytes 0x%x", 1691 vp, mbp, vp->v_numoutput, bytes); 1692 mbp->b_bufsize = npages << PAGE_SHIFT; 1693 mbp->b_data = (void *)kva; 1694 mbp->b_resid = mbp->b_bcount = bytes; 1695 mbp->b_cflags = BC_BUSY|BC_AGE; 1696 mbp->b_iodone = uvm_aio_biodone; 1697 1698 bp = NULL; 1699 for (offset = startoffset; 1700 bytes > 0; 1701 offset += iobytes, bytes -= iobytes) { 1702 lbn = offset >> fs_bshift; 1703 error = ufs_bmaparray(vp, lbn, &blkno, NULL, NULL, &run, 1704 lfs_issequential_hole); 1705 if (error) { 1706 UVMHIST_LOG(ubchist, "ufs_bmaparray() -> %d", 1707 error,0,0,0); 1708 skipbytes += bytes; 1709 bytes = 0; 1710 break; 1711 } 1712 1713 iobytes = MIN((((off_t)lbn + 1 + run) << fs_bshift) - offset, 1714 bytes); 1715 if (blkno == (daddr_t)-1) { 1716 skipbytes += iobytes; 1717 continue; 1718 } 1719 1720 /* 1721 * Discover how much we can really pack into this buffer. 1722 */ 1723 /* If no room in the current segment, finish it up */ 1724 if (sp->sum_bytes_left < sizeof(int32_t) || 1725 sp->seg_bytes_left < (1 << fs->lfs_bshift)) { 1726 int vers; 1727 1728 lfs_updatemeta(sp); 1729 vers = sp->fip->fi_version; 1730 lfs_release_finfo(fs); 1731 (void) lfs_writeseg(fs, sp); 1732 1733 lfs_acquire_finfo(fs, ip->i_number, vers); 1734 } 1735 /* Check both for space in segment and space in segsum */ 1736 iobytes = MIN(iobytes, (sp->seg_bytes_left >> fs_bshift) 1737 << fs_bshift); 1738 iobytes = MIN(iobytes, (sp->sum_bytes_left / sizeof(int32_t)) 1739 << fs_bshift); 1740 KASSERT(iobytes > 0); 1741 1742 /* if it's really one i/o, don't make a second buf */ 1743 if (offset == startoffset && iobytes == bytes) { 1744 bp = mbp; 1745 /* correct overcount if there is no second buffer */ 1746 mutex_enter(&vp->v_interlock); 1747 --vp->v_numoutput; 1748 mutex_exit(&vp->v_interlock); 1749 } else { 1750 bp = getiobuf(NULL, true); 1751 UVMHIST_LOG(ubchist, "vp %p bp %p num now %d", 1752 vp, bp, vp->v_numoutput, 0); 1753 bp->b_data = (char *)kva + 1754 (vaddr_t)(offset - pg->offset); 1755 bp->b_resid = bp->b_bcount = iobytes; 1756 bp->b_cflags = BC_BUSY; 1757 bp->b_iodone = uvm_aio_biodone1; 1758 } 1759 1760 /* XXX This is silly ... is this necessary? */ 1761 mutex_enter(&bufcache_lock); 1762 mutex_enter(&vp->v_interlock); 1763 bgetvp(vp, bp); 1764 mutex_exit(&vp->v_interlock); 1765 mutex_exit(&bufcache_lock); 1766 1767 bp->b_lblkno = lblkno(fs, offset); 1768 bp->b_private = mbp; 1769 if (devvp->v_type == VBLK) { 1770 bp->b_dev = devvp->v_rdev; 1771 } 1772 VOP_BWRITE(bp); 1773 while (lfs_gatherblock(sp, bp, NULL)) 1774 continue; 1775 } 1776 1777 if (skipbytes) { 1778 UVMHIST_LOG(ubchist, "skipbytes %d", skipbytes, 0,0,0); 1779 mutex_enter(mbp->b_objlock); 1780 if (error) { 1781 mbp->b_error = error; 1782 } 1783 mbp->b_resid -= skipbytes; 1784 mutex_exit(mbp->b_objlock); 1785 if (mbp->b_resid == 0) { 1786 biodone(mbp); 1787 } 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