1 /* $NetBSD: nilfs_vfsops.c,v 1.10 2012/12/20 08:03:43 hannken Exp $ */ 2 3 /* 4 * Copyright (c) 2008, 2009 Reinoud Zandijk 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 */ 28 29 #include <sys/cdefs.h> 30 #ifndef lint 31 __KERNEL_RCSID(0, "$NetBSD: nilfs_vfsops.c,v 1.10 2012/12/20 08:03:43 hannken Exp $"); 32 #endif /* not lint */ 33 34 35 #if defined(_KERNEL_OPT) 36 #include "opt_compat_netbsd.h" 37 #endif 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/sysctl.h> 42 #include <sys/namei.h> 43 #include <sys/proc.h> 44 #include <sys/kernel.h> 45 #include <sys/vnode.h> 46 #include <miscfs/genfs/genfs.h> 47 #include <miscfs/specfs/specdev.h> 48 #include <sys/mount.h> 49 #include <sys/buf.h> 50 #include <sys/file.h> 51 #include <sys/device.h> 52 #include <sys/disklabel.h> 53 #include <sys/ioctl.h> 54 #include <sys/malloc.h> 55 #include <sys/dirent.h> 56 #include <sys/stat.h> 57 #include <sys/conf.h> 58 #include <sys/kauth.h> 59 #include <sys/module.h> 60 61 #include <fs/nilfs/nilfs_mount.h> 62 #include <sys/dirhash.h> 63 64 65 #include "nilfs.h" 66 #include "nilfs_subr.h" 67 #include "nilfs_bswap.h" 68 69 MODULE(MODULE_CLASS_VFS, nilfs, NULL); 70 71 #define VTOI(vnode) ((struct nilfs_node *) vnode->v_data) 72 73 #define NILFS_SET_SYSTEMFILE(vp) { \ 74 /* XXXAD Is the vnode locked? */ \ 75 (vp)->v_vflag |= VV_SYSTEM; \ 76 vref(vp); \ 77 vput(vp); } 78 79 #define NILFS_UNSET_SYSTEMFILE(vp) { \ 80 /* XXXAD Is the vnode locked? */ \ 81 (vp)->v_vflag &= ~VV_SYSTEM; \ 82 vrele(vp); } 83 84 85 /* verbose levels of the nilfs filingsystem */ 86 int nilfs_verbose = NILFS_DEBUGGING; 87 88 /* malloc regions */ 89 MALLOC_JUSTDEFINE(M_NILFSMNT, "NILFS mount", "NILFS mount structures"); 90 MALLOC_JUSTDEFINE(M_NILFSTEMP, "NILFS temp", "NILFS scrap space"); 91 struct pool nilfs_node_pool; 92 93 /* globals */ 94 struct _nilfs_devices nilfs_devices; 95 static struct sysctllog *nilfs_sysctl_log; 96 97 /* supported functions predefined */ 98 VFS_PROTOS(nilfs); 99 100 101 /* --------------------------------------------------------------------- */ 102 103 /* predefine vnode-op list descriptor */ 104 extern const struct vnodeopv_desc nilfs_vnodeop_opv_desc; 105 106 const struct vnodeopv_desc * const nilfs_vnodeopv_descs[] = { 107 &nilfs_vnodeop_opv_desc, 108 NULL, 109 }; 110 111 112 /* vfsops descriptor linked in as anchor point for the filingsystem */ 113 struct vfsops nilfs_vfsops = { 114 MOUNT_NILFS, /* vfs_name */ 115 sizeof (struct nilfs_args), 116 nilfs_mount, 117 nilfs_start, 118 nilfs_unmount, 119 nilfs_root, 120 (void *)eopnotsupp, /* vfs_quotactl */ 121 nilfs_statvfs, 122 nilfs_sync, 123 nilfs_vget, 124 nilfs_fhtovp, 125 nilfs_vptofh, 126 nilfs_init, 127 nilfs_reinit, 128 nilfs_done, 129 nilfs_mountroot, 130 nilfs_snapshot, 131 vfs_stdextattrctl, 132 (void *)eopnotsupp, /* vfs_suspendctl */ 133 genfs_renamelock_enter, 134 genfs_renamelock_exit, 135 (void *)eopnotsupp, /* vfs_full_fsync */ 136 nilfs_vnodeopv_descs, 137 0, /* int vfs_refcount */ 138 { NULL, NULL, }, /* LIST_ENTRY(vfsops) */ 139 }; 140 141 /* --------------------------------------------------------------------- */ 142 143 /* file system starts here */ 144 void 145 nilfs_init(void) 146 { 147 size_t size; 148 149 /* setup memory types */ 150 malloc_type_attach(M_NILFSMNT); 151 malloc_type_attach(M_NILFSTEMP); 152 153 /* init device lists */ 154 SLIST_INIT(&nilfs_devices); 155 156 /* init node pools */ 157 size = sizeof(struct nilfs_node); 158 pool_init(&nilfs_node_pool, size, 0, 0, 0, 159 "nilfs_node_pool", NULL, IPL_NONE); 160 } 161 162 163 void 164 nilfs_reinit(void) 165 { 166 /* nothing to do */ 167 } 168 169 170 void 171 nilfs_done(void) 172 { 173 /* remove pools */ 174 pool_destroy(&nilfs_node_pool); 175 176 malloc_type_detach(M_NILFSMNT); 177 malloc_type_detach(M_NILFSTEMP); 178 } 179 180 /* 181 * If running a DEBUG kernel, provide an easy way to set the debug flags when 182 * running into a problem. 183 */ 184 #define NILFS_VERBOSE_SYSCTLOPT 1 185 186 static int 187 nilfs_modcmd(modcmd_t cmd, void *arg) 188 { 189 const struct sysctlnode *node; 190 int error; 191 192 switch (cmd) { 193 case MODULE_CMD_INIT: 194 error = vfs_attach(&nilfs_vfsops); 195 if (error != 0) 196 break; 197 /* 198 * XXX the "30" below could be dynamic, thereby eliminating one 199 * more instance of the "number to vfs" mapping problem, but 200 * "30" is the order as taken from sys/mount.h 201 */ 202 sysctl_createv(&nilfs_sysctl_log, 0, NULL, NULL, 203 CTLFLAG_PERMANENT, 204 CTLTYPE_NODE, "vfs", NULL, 205 NULL, 0, NULL, 0, 206 CTL_VFS, CTL_EOL); 207 sysctl_createv(&nilfs_sysctl_log, 0, NULL, &node, 208 CTLFLAG_PERMANENT, 209 CTLTYPE_NODE, "nilfs", 210 SYSCTL_DESCR("NTT's NILFSv2"), 211 NULL, 0, NULL, 0, 212 CTL_VFS, 30, CTL_EOL); 213 #ifdef DEBUG 214 sysctl_createv(&nilfs_sysctl_log, 0, NULL, &node, 215 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 216 CTLTYPE_INT, "verbose", 217 SYSCTL_DESCR("Bitmask for filesystem debugging"), 218 NULL, 0, &nilfs_verbose, 0, 219 CTL_VFS, 30, NILFS_VERBOSE_SYSCTLOPT, CTL_EOL); 220 #endif 221 break; 222 case MODULE_CMD_FINI: 223 error = vfs_detach(&nilfs_vfsops); 224 if (error != 0) 225 break; 226 sysctl_teardown(&nilfs_sysctl_log); 227 break; 228 default: 229 error = ENOTTY; 230 break; 231 } 232 233 return (error); 234 } 235 236 /* --------------------------------------------------------------------- */ 237 238 int 239 nilfs_mountroot(void) 240 { 241 return EOPNOTSUPP; 242 } 243 244 /* --------------------------------------------------------------------- */ 245 246 /* system nodes */ 247 static int 248 nilfs_create_system_nodes(struct nilfs_device *nilfsdev) 249 { 250 int error; 251 252 error = nilfs_get_node_raw(nilfsdev, NULL, NILFS_DAT_INO, 253 &nilfsdev->super_root.sr_dat, &nilfsdev->dat_node); 254 if (error) 255 goto errorout; 256 257 error = nilfs_get_node_raw(nilfsdev, NULL, NILFS_CPFILE_INO, 258 &nilfsdev->super_root.sr_cpfile, &nilfsdev->cp_node); 259 if (error) 260 goto errorout; 261 262 error = nilfs_get_node_raw(nilfsdev, NULL, NILFS_SUFILE_INO, 263 &nilfsdev->super_root.sr_sufile, &nilfsdev->su_node); 264 if (error) 265 goto errorout; 266 267 NILFS_SET_SYSTEMFILE(nilfsdev->dat_node->vnode); 268 NILFS_SET_SYSTEMFILE(nilfsdev->cp_node->vnode); 269 NILFS_SET_SYSTEMFILE(nilfsdev->su_node->vnode); 270 271 return 0; 272 errorout: 273 nilfs_dispose_node(&nilfsdev->dat_node); 274 nilfs_dispose_node(&nilfsdev->cp_node); 275 nilfs_dispose_node(&nilfsdev->su_node); 276 277 return error; 278 } 279 280 281 static void 282 nilfs_release_system_nodes(struct nilfs_device *nilfsdev) 283 { 284 if (!nilfsdev) 285 return; 286 if (nilfsdev->refcnt > 0) 287 return; 288 289 if (nilfsdev->dat_node) 290 NILFS_UNSET_SYSTEMFILE(nilfsdev->dat_node->vnode); 291 if (nilfsdev->cp_node) 292 NILFS_UNSET_SYSTEMFILE(nilfsdev->cp_node->vnode); 293 if (nilfsdev->su_node) 294 NILFS_UNSET_SYSTEMFILE(nilfsdev->su_node->vnode); 295 296 nilfs_dispose_node(&nilfsdev->dat_node); 297 nilfs_dispose_node(&nilfsdev->cp_node); 298 nilfs_dispose_node(&nilfsdev->su_node); 299 } 300 301 302 /* --------------------------------------------------------------------- */ 303 304 static int 305 nilfs_check_superblock_crc(struct nilfs_super_block *super) 306 { 307 uint32_t super_crc, comp_crc; 308 309 /* check super block magic */ 310 if (nilfs_rw16(super->s_magic) != NILFS_SUPER_MAGIC) 311 return 0; 312 313 /* preserve crc */ 314 super_crc = nilfs_rw32(super->s_sum); 315 316 /* calculate */ 317 super->s_sum = 0; 318 comp_crc = crc32_le(nilfs_rw32(super->s_crc_seed), 319 (uint8_t *) super, nilfs_rw16(super->s_bytes)); 320 321 /* restore */ 322 super->s_sum = nilfs_rw32(super_crc); 323 324 /* check CRC */ 325 return (super_crc == comp_crc); 326 } 327 328 329 330 static int 331 nilfs_read_superblock(struct nilfs_device *nilfsdev) 332 { 333 struct nilfs_super_block *super, tmp_super; 334 struct buf *bp; 335 uint64_t sb1off, sb2off; 336 uint64_t last_cno1, last_cno2; 337 uint64_t dev_blk; 338 int dev_bsize, dev_blks; 339 int sb1ok, sb2ok, swp; 340 int error; 341 342 sb1off = NILFS_SB_OFFSET_BYTES; 343 sb2off = NILFS_SB2_OFFSET_BYTES(nilfsdev->devsize); 344 345 dev_bsize = 1 << nilfsdev->devvp->v_mount->mnt_fs_bshift; 346 347 /* read our superblock regardless of backing device blocksize */ 348 dev_blk = 0; 349 dev_blks = (sb1off + dev_bsize -1)/dev_bsize; 350 error = bread(nilfsdev->devvp, dev_blk, dev_blks * dev_bsize, NOCRED, 0, &bp); 351 if (error) { 352 return error; 353 } 354 355 /* copy read-in super block at the offset */ 356 super = &nilfsdev->super; 357 memcpy(super, (uint8_t *) bp->b_data + NILFS_SB_OFFSET_BYTES, 358 sizeof(struct nilfs_super_block)); 359 brelse(bp, BC_AGE); 360 361 /* read our 2nd superblock regardless of backing device blocksize */ 362 dev_blk = sb2off / dev_bsize; 363 dev_blks = 2; /* assumption max one dev_bsize */ 364 error = bread(nilfsdev->devvp, dev_blk, dev_blks * dev_bsize, NOCRED, 0, &bp); 365 if (error) { 366 return error; 367 } 368 369 /* copy read-in superblock2 at the offset */ 370 super = &nilfsdev->super2; 371 memcpy(super, (uint8_t *) bp->b_data + NILFS_SB_OFFSET_BYTES, 372 sizeof(struct nilfs_super_block)); 373 brelse(bp, BC_AGE); 374 375 sb1ok = nilfs_check_superblock_crc(&nilfsdev->super); 376 sb2ok = nilfs_check_superblock_crc(&nilfsdev->super2); 377 378 last_cno1 = nilfs_rw64(nilfsdev->super.s_last_cno); 379 last_cno2 = nilfs_rw64(nilfsdev->super2.s_last_cno); 380 swp = sb2ok && (last_cno2 > last_cno1); 381 382 if (swp) { 383 printf("nilfs warning: broken superblock, using spare\n"); 384 tmp_super = nilfsdev->super2; 385 nilfsdev->super2 = nilfsdev->super; /* why preserve? */ 386 nilfsdev->super = tmp_super; 387 } 388 389 if (!sb1ok && !sb2ok) { 390 printf("nilfs: no valid superblocks found\n"); 391 return EINVAL; 392 } 393 394 return 0; 395 } 396 397 398 /* XXX NOTHING from the system nodes should need to be written here */ 399 static void 400 nilfs_unmount_base(struct nilfs_device *nilfsdev) 401 { 402 int error; 403 404 if (!nilfsdev) 405 return; 406 407 /* remove all our information */ 408 error = vinvalbuf(nilfsdev->devvp, 0, FSCRED, curlwp, 0, 0); 409 KASSERT(error == 0); 410 411 /* release the device's system nodes */ 412 nilfs_release_system_nodes(nilfsdev); 413 414 /* TODO writeout super_block? */ 415 } 416 417 418 static int 419 nilfs_mount_base(struct nilfs_device *nilfsdev, 420 struct mount *mp, struct nilfs_args *args) 421 { 422 struct lwp *l = curlwp; 423 uint64_t last_pseg, last_cno, last_seq; 424 uint32_t log_blocksize; 425 int error; 426 427 /* flush out any old buffers remaining from a previous use. */ 428 if ((error = vinvalbuf(nilfsdev->devvp, V_SAVE, l->l_cred, l, 0, 0))) 429 return error; 430 431 /* read in our superblock */ 432 error = nilfs_read_superblock(nilfsdev); 433 if (error) { 434 printf("nilfs_mount: can't read in super block : %d\n", error); 435 return error; 436 } 437 438 /* get our blocksize */ 439 log_blocksize = nilfs_rw32(nilfsdev->super.s_log_block_size); 440 nilfsdev->blocksize = (uint64_t) 1 << (log_blocksize + 10); 441 /* TODO check superblock's blocksize limits */ 442 443 /* calculate dat structure parameters */ 444 nilfs_calc_mdt_consts(nilfsdev, &nilfsdev->dat_mdt, 445 nilfs_rw16(nilfsdev->super.s_dat_entry_size)); 446 nilfs_calc_mdt_consts(nilfsdev, &nilfsdev->ifile_mdt, 447 nilfs_rw16(nilfsdev->super.s_inode_size)); 448 449 DPRINTF(VOLUMES, ("nilfs_mount: accepted super block\n")); 450 451 /* search for the super root and roll forward when needed */ 452 nilfs_search_super_root(nilfsdev); 453 454 nilfsdev->mount_state = nilfs_rw16(nilfsdev->super.s_state); 455 if (nilfsdev->mount_state != NILFS_VALID_FS) { 456 printf("FS is seriously damaged, needs repairing\n"); 457 printf("aborting mount\n"); 458 return EINVAL; 459 } 460 461 /* 462 * FS should be ok now. The superblock and the last segsum could be 463 * updated from the repair so extract running values again. 464 */ 465 last_pseg = nilfs_rw64(nilfsdev->super.s_last_pseg); /*blknr */ 466 last_cno = nilfs_rw64(nilfsdev->super.s_last_cno); 467 last_seq = nilfs_rw64(nilfsdev->super.s_last_seq); 468 469 nilfsdev->last_seg_seq = last_seq; 470 nilfsdev->last_seg_num = nilfs_get_segnum_of_block(nilfsdev, last_pseg); 471 nilfsdev->next_seg_num = nilfs_get_segnum_of_block(nilfsdev, 472 nilfs_rw64(nilfsdev->last_segsum.ss_next)); 473 nilfsdev->last_cno = last_cno; 474 475 DPRINTF(VOLUMES, ("nilfs_mount: accepted super root\n")); 476 477 /* create system vnodes for DAT, CP and SEGSUM */ 478 error = nilfs_create_system_nodes(nilfsdev); 479 if (error) 480 nilfs_unmount_base(nilfsdev); 481 return error; 482 } 483 484 485 static void 486 nilfs_unmount_device(struct nilfs_device *nilfsdev) 487 { 488 int error; 489 490 /* is there anything? */ 491 if (nilfsdev == NULL) 492 return; 493 494 /* remove the device only if we're the last reference */ 495 nilfsdev->refcnt--; 496 if (nilfsdev->refcnt >= 1) 497 return; 498 499 /* unmount our base */ 500 nilfs_unmount_base(nilfsdev); 501 502 /* remove from our device list */ 503 SLIST_REMOVE(&nilfs_devices, nilfsdev, nilfs_device, next_device); 504 505 /* close device */ 506 DPRINTF(VOLUMES, ("closing device\n")); 507 508 /* remove our mount reference before closing device */ 509 nilfsdev->devvp->v_specmountpoint = NULL; 510 511 /* devvp is still locked by us */ 512 vn_lock(nilfsdev->devvp, LK_EXCLUSIVE | LK_RETRY); 513 error = VOP_CLOSE(nilfsdev->devvp, FREAD | FWRITE, NOCRED); 514 if (error) 515 printf("Error during closure of device! error %d, " 516 "device might stay locked\n", error); 517 DPRINTF(VOLUMES, ("device close ok\n")); 518 519 /* clear our mount reference and release device node */ 520 vput(nilfsdev->devvp); 521 522 /* free our device info */ 523 free(nilfsdev, M_NILFSMNT); 524 } 525 526 527 static int 528 nilfs_check_mounts(struct nilfs_device *nilfsdev, struct mount *mp, 529 struct nilfs_args *args) 530 { 531 struct nilfs_mount *ump; 532 uint64_t last_cno; 533 534 /* no double-mounting of the same checkpoint */ 535 STAILQ_FOREACH(ump, &nilfsdev->mounts, next_mount) { 536 if (ump->mount_args.cpno == args->cpno) 537 return EBUSY; 538 } 539 540 /* allow readonly mounts without questioning here */ 541 if (mp->mnt_flag & MNT_RDONLY) 542 return 0; 543 544 /* readwrite mount you want */ 545 STAILQ_FOREACH(ump, &nilfsdev->mounts, next_mount) { 546 /* only one RW mount on this device! */ 547 if ((ump->vfs_mountp->mnt_flag & MNT_RDONLY)==0) 548 return EROFS; 549 /* RDONLY on last mountpoint is device busy */ 550 last_cno = nilfs_rw64(ump->nilfsdev->super.s_last_cno); 551 if (ump->mount_args.cpno == last_cno) 552 return EBUSY; 553 } 554 555 /* OK for now */ 556 return 0; 557 } 558 559 560 static int 561 nilfs_mount_device(struct vnode *devvp, struct mount *mp, struct nilfs_args *args, 562 struct nilfs_device **nilfsdev_p) 563 { 564 uint64_t psize; 565 unsigned secsize; 566 struct nilfs_device *nilfsdev; 567 struct lwp *l = curlwp; 568 int openflags, accessmode, error; 569 570 DPRINTF(VOLUMES, ("Mounting NILFS device\n")); 571 572 /* lookup device in our nilfs_mountpoints */ 573 *nilfsdev_p = NULL; 574 SLIST_FOREACH(nilfsdev, &nilfs_devices, next_device) 575 if (nilfsdev->devvp == devvp) 576 break; 577 578 if (nilfsdev) { 579 DPRINTF(VOLUMES, ("device already mounted\n")); 580 error = nilfs_check_mounts(nilfsdev, mp, args); 581 if (error) 582 return error; 583 nilfsdev->refcnt++; 584 *nilfsdev_p = nilfsdev; 585 return 0; 586 } 587 588 DPRINTF(VOLUMES, ("no previous mounts on this device, mounting device\n")); 589 590 /* check if its a block device specified */ 591 if (devvp->v_type != VBLK) { 592 vrele(devvp); 593 return ENOTBLK; 594 } 595 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 596 vrele(devvp); 597 return ENXIO; 598 } 599 600 /* 601 * If mount by non-root, then verify that user has necessary 602 * permissions on the device. 603 */ 604 accessmode = VREAD; 605 if ((mp->mnt_flag & MNT_RDONLY) == 0) 606 accessmode |= VWRITE; 607 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 608 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 609 KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(accessmode)); 610 VOP_UNLOCK(devvp); 611 if (error) { 612 vrele(devvp); 613 return error; 614 } 615 616 /* 617 * Open device read-write; TODO how about upgrading later when needed? 618 */ 619 openflags = FREAD | FWRITE; 620 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 621 error = VOP_OPEN(devvp, openflags, FSCRED); 622 VOP_UNLOCK(devvp); 623 if (error) { 624 vrele(devvp); 625 return error; 626 } 627 628 /* opened ok, try mounting */ 629 nilfsdev = malloc(sizeof(*nilfsdev), M_NILFSMNT, M_WAITOK | M_ZERO); 630 631 /* initialise */ 632 nilfsdev->refcnt = 1; 633 nilfsdev->devvp = devvp; 634 nilfsdev->uncomitted_bl = 0; 635 cv_init(&nilfsdev->sync_cv, "nilfssyn"); 636 STAILQ_INIT(&nilfsdev->mounts); 637 638 /* register nilfs_device in list */ 639 SLIST_INSERT_HEAD(&nilfs_devices, nilfsdev, next_device); 640 641 /* get our device's size */ 642 error = getdisksize(devvp, &psize, &secsize); 643 if (error) { 644 /* remove all our information */ 645 nilfs_unmount_device(nilfsdev); 646 return EINVAL; 647 } 648 649 nilfsdev->devsize = psize * secsize; 650 651 /* connect to the head for most recent files XXX really pass mp and args? */ 652 error = nilfs_mount_base(nilfsdev, mp, args); 653 if (error) { 654 /* remove all our information */ 655 nilfs_unmount_device(nilfsdev); 656 return EINVAL; 657 } 658 659 *nilfsdev_p = nilfsdev; 660 DPRINTF(VOLUMES, ("NILFS device mounted ok\n")); 661 662 return 0; 663 } 664 665 666 static int 667 nilfs_mount_checkpoint(struct nilfs_mount *ump) 668 { 669 struct nilfs_cpfile_header *cphdr; 670 struct nilfs_checkpoint *cp; 671 struct nilfs_inode ifile_inode; 672 struct nilfs_node *cp_node; 673 struct buf *bp; 674 uint64_t ncp, nsn, fcpno, blocknr, last_cno; 675 uint32_t off, dlen; 676 int cp_per_block, error; 677 678 DPRINTF(VOLUMES, ("mount_nilfs: trying to mount checkpoint number " 679 "%"PRIu64"\n", ump->mount_args.cpno)); 680 681 cp_node = ump->nilfsdev->cp_node; 682 683 /* get cpfile header from 1st block of cp file */ 684 error = nilfs_bread(cp_node, 0, NOCRED, 0, &bp); 685 if (error) 686 return error; 687 cphdr = (struct nilfs_cpfile_header *) bp->b_data; 688 ncp = nilfs_rw64(cphdr->ch_ncheckpoints); 689 nsn = nilfs_rw64(cphdr->ch_nsnapshots); 690 691 brelse(bp, BC_AGE); 692 693 DPRINTF(VOLUMES, ("mount_nilfs: checkpoint header read in\n")); 694 DPRINTF(VOLUMES, ("\tNumber of checkpoints %"PRIu64"\n", ncp)); 695 DPRINTF(VOLUMES, ("\tNumber of snapshots %"PRIu64"\n", nsn)); 696 697 /* read in our specified checkpoint */ 698 dlen = nilfs_rw16(ump->nilfsdev->super.s_checkpoint_size); 699 cp_per_block = ump->nilfsdev->blocksize / dlen; 700 701 fcpno = ump->mount_args.cpno + NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET -1; 702 blocknr = fcpno / cp_per_block; 703 off = (fcpno % cp_per_block) * dlen; 704 705 error = nilfs_bread(cp_node, blocknr, NOCRED, 0, &bp); 706 if (error) { 707 printf("mount_nilfs: couldn't read cp block %"PRIu64"\n", 708 fcpno); 709 return EINVAL; 710 } 711 712 /* needs to be a valid checkpoint */ 713 cp = (struct nilfs_checkpoint *) ((uint8_t *) bp->b_data + off); 714 if (cp->cp_flags & NILFS_CHECKPOINT_INVALID) { 715 printf("mount_nilfs: checkpoint marked invalid\n"); 716 brelse(bp, BC_AGE); 717 return EINVAL; 718 } 719 720 /* is this really the checkpoint we want? */ 721 if (nilfs_rw64(cp->cp_cno) != ump->mount_args.cpno) { 722 printf("mount_nilfs: checkpoint file corrupt? " 723 "expected cpno %"PRIu64", found cpno %"PRIu64"\n", 724 ump->mount_args.cpno, nilfs_rw64(cp->cp_cno)); 725 brelse(bp, BC_AGE); 726 return EINVAL; 727 } 728 729 /* check if its a snapshot ! */ 730 last_cno = nilfs_rw64(ump->nilfsdev->super.s_last_cno); 731 if (ump->mount_args.cpno != last_cno) { 732 /* only allow snapshots if not mounting on the last cp */ 733 if ((cp->cp_flags & NILFS_CHECKPOINT_SNAPSHOT) == 0) { 734 printf( "mount_nilfs: checkpoint %"PRIu64" is not a " 735 "snapshot\n", ump->mount_args.cpno); 736 brelse(bp, BC_AGE); 737 return EINVAL; 738 } 739 } 740 741 ifile_inode = cp->cp_ifile_inode; 742 brelse(bp, BC_AGE); 743 744 /* get ifile inode */ 745 error = nilfs_get_node_raw(ump->nilfsdev, NULL, NILFS_IFILE_INO, 746 &ifile_inode, &ump->ifile_node); 747 if (error) { 748 printf("mount_nilfs: can't read ifile node\n"); 749 return EINVAL; 750 } 751 NILFS_SET_SYSTEMFILE(ump->ifile_node->vnode); 752 753 /* get root node? */ 754 755 return 0; 756 } 757 758 759 static int 760 nilfs_stop_writing(struct nilfs_mount *ump) 761 { 762 /* readonly mounts won't write */ 763 if (ump->vfs_mountp->mnt_flag & MNT_RDONLY) 764 return 0; 765 766 DPRINTF(CALL, ("nilfs_stop_writing called for RW mount\n")); 767 768 /* TODO writeout super_block? */ 769 /* XXX no support for writing yet anyway */ 770 return 0; 771 } 772 773 774 /* --------------------------------------------------------------------- */ 775 776 777 778 #define MPFREE(a, lst) \ 779 if ((a)) free((a), lst); 780 static void 781 free_nilfs_mountinfo(struct mount *mp) 782 { 783 struct nilfs_mount *ump = VFSTONILFS(mp); 784 785 if (ump == NULL) 786 return; 787 788 mutex_destroy(&ump->ihash_lock); 789 mutex_destroy(&ump->get_node_lock); 790 MPFREE(ump, M_NILFSMNT); 791 } 792 #undef MPFREE 793 794 int 795 nilfs_mount(struct mount *mp, const char *path, 796 void *data, size_t *data_len) 797 { 798 struct nilfs_args *args = data; 799 struct nilfs_device *nilfsdev; 800 struct nilfs_mount *ump; 801 struct vnode *devvp; 802 int lst, error; 803 804 DPRINTF(VFSCALL, ("nilfs_mount called\n")); 805 806 if (*data_len < sizeof *args) 807 return EINVAL; 808 809 if (mp->mnt_flag & MNT_GETARGS) { 810 /* request for the mount arguments */ 811 ump = VFSTONILFS(mp); 812 if (ump == NULL) 813 return EINVAL; 814 *args = ump->mount_args; 815 *data_len = sizeof *args; 816 return 0; 817 } 818 819 /* check/translate struct version */ 820 if (args->version != 1) { 821 printf("mount_nilfs: unrecognized argument structure version\n"); 822 return EINVAL; 823 } 824 /* TODO sanity checking other mount arguments */ 825 826 /* handle request for updating mount parameters */ 827 if (mp->mnt_flag & MNT_UPDATE) { 828 /* TODO can't update my mountpoint yet */ 829 return EOPNOTSUPP; 830 } 831 832 /* lookup name to get its vnode */ 833 error = namei_simple_user(args->fspec, NSM_FOLLOW_NOEMULROOT, &devvp); 834 if (error) 835 return error; 836 837 #ifdef DEBUG 838 if (nilfs_verbose & NILFS_DEBUG_VOLUMES) 839 vprint("NILFS mount, trying to mount \n", devvp); 840 #endif 841 842 error = nilfs_mount_device(devvp, mp, args, &nilfsdev); 843 if (error) 844 return error; 845 846 /* 847 * Create a nilfs_mount on the specified checkpoint. Note that only 848 * ONE RW mount point can exist and it needs to have the highest 849 * checkpoint nr. If mounting RW and its not on the last checkpoint we 850 * need to invalidate all checkpoints that follow!!! This is an 851 * advanced option. 852 */ 853 854 /* setup basic mountpoint structure */ 855 mp->mnt_data = NULL; 856 mp->mnt_stat.f_fsidx.__fsid_val[0] = (uint32_t) devvp->v_rdev; 857 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_NILFS); 858 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 859 mp->mnt_stat.f_namemax = NILFS_NAME_LEN; 860 mp->mnt_flag |= MNT_LOCAL; 861 862 /* XXX can't enable MPSAFE yet since genfs barfs on bad CV */ 863 // mp->mnt_iflag |= IMNT_MPSAFE; 864 865 /* set our dev and fs units */ 866 mp->mnt_dev_bshift = nilfs_rw32(nilfsdev->super.s_log_block_size) + 10; 867 mp->mnt_fs_bshift = mp->mnt_dev_bshift; 868 869 /* allocate nilfs part of mount structure; malloc always succeeds */ 870 ump = malloc(sizeof(struct nilfs_mount), M_NILFSMNT, M_WAITOK | M_ZERO); 871 872 /* init locks */ 873 mutex_init(&ump->ihash_lock, MUTEX_DEFAULT, IPL_NONE); 874 mutex_init(&ump->get_node_lock, MUTEX_DEFAULT, IPL_NONE); 875 876 /* init our hash table for inode lookup */ 877 for (lst = 0; lst < NILFS_INODE_HASHSIZE; lst++) { 878 LIST_INIT(&ump->nilfs_nodes[lst]); 879 } 880 881 /* set up linkage */ 882 mp->mnt_data = ump; 883 ump->vfs_mountp = mp; 884 ump->nilfsdev = nilfsdev; 885 886 #if 0 887 #ifndef NILFS_READWRITE 888 /* force read-only for now */ 889 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 890 printf( "Enable kernel/module option NILFS_READWRITE for " 891 "writing, downgrading access to read-only\n"); 892 mp->mnt_flag |= MNT_RDONLY; 893 } 894 #endif 895 #endif 896 897 /* DONT register our nilfs mountpoint on our vfs mountpoint */ 898 devvp->v_specmountpoint = NULL; 899 #if 0 900 if (devvp->v_specmountpoint == NULL) 901 devvp->v_specmountpoint = mp; 902 if ((mp->mnt_flag & MNT_RDONLY) == 0) 903 devvp->v_specmountpoint = mp; 904 #endif 905 906 /* add our mountpoint */ 907 STAILQ_INSERT_TAIL(&nilfsdev->mounts, ump, next_mount); 908 909 /* get our selected checkpoint */ 910 if (args->cpno == 0) 911 args->cpno = nilfsdev->last_cno; 912 args->cpno = MIN(args->cpno, nilfsdev->last_cno); 913 914 /* setting up other parameters */ 915 ump->mount_args = *args; 916 error = nilfs_mount_checkpoint(ump); 917 if (error) { 918 nilfs_unmount(mp, MNT_FORCE); 919 return error; 920 } 921 922 /* set VFS info */ 923 error = set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 924 mp->mnt_op->vfs_name, mp, curlwp); 925 if (error) { 926 nilfs_unmount(mp, MNT_FORCE); 927 return error; 928 } 929 930 /* successfully mounted */ 931 DPRINTF(VOLUMES, ("nilfs_mount() successfull\n")); 932 933 return 0; 934 } 935 936 /* --------------------------------------------------------------------- */ 937 938 939 /* remove our mountpoint and if its the last reference, remove our device */ 940 int 941 nilfs_unmount(struct mount *mp, int mntflags) 942 { 943 struct nilfs_device *nilfsdev; 944 struct nilfs_mount *ump; 945 int error, flags; 946 947 DPRINTF(VFSCALL, ("nilfs_umount called\n")); 948 949 ump = VFSTONILFS(mp); 950 if (!ump) 951 panic("NILFS unmount: empty ump\n"); 952 nilfsdev = ump->nilfsdev; 953 954 /* 955 * Flush all nodes associated to this mountpoint. By specifying 956 * SKIPSYSTEM we can skip vnodes marked with VV_SYSTEM. This hardly 957 * documented feature allows us to exempt certain files from being 958 * flushed. 959 */ 960 flags = (mntflags & MNT_FORCE) ? FORCECLOSE : 0; 961 if ((error = vflush(mp, NULLVP, flags | SKIPSYSTEM)) != 0) 962 return error; 963 964 /* if we're the write mount, we ought to close the writing session */ 965 error = nilfs_stop_writing(ump); 966 if (error) 967 return error; 968 969 if (ump->ifile_node) 970 NILFS_UNSET_SYSTEMFILE(ump->ifile_node->vnode); 971 nilfs_dispose_node(&ump->ifile_node); 972 973 /* remove our mount point */ 974 STAILQ_REMOVE(&nilfsdev->mounts, ump, nilfs_mount, next_mount); 975 free_nilfs_mountinfo(mp); 976 977 /* free ump struct references */ 978 mp->mnt_data = NULL; 979 mp->mnt_flag &= ~MNT_LOCAL; 980 981 /* unmount the device itself when we're the last one */ 982 nilfs_unmount_device(nilfsdev); 983 984 DPRINTF(VOLUMES, ("Fin unmount\n")); 985 return error; 986 } 987 988 /* --------------------------------------------------------------------- */ 989 990 int 991 nilfs_start(struct mount *mp, int flags) 992 { 993 /* do we have to do something here? */ 994 return 0; 995 } 996 997 /* --------------------------------------------------------------------- */ 998 999 int 1000 nilfs_root(struct mount *mp, struct vnode **vpp) 1001 { 1002 struct nilfs_mount *ump = VFSTONILFS(mp); 1003 struct nilfs_node *node; 1004 int error; 1005 1006 DPRINTF(NODE, ("nilfs_root called\n")); 1007 1008 error = nilfs_get_node(ump, NILFS_ROOT_INO, &node); 1009 if (node) { 1010 *vpp = node->vnode; 1011 KASSERT(node->vnode->v_vflag & VV_ROOT); 1012 } 1013 1014 DPRINTF(NODE, ("nilfs_root finished\n")); 1015 return error; 1016 } 1017 1018 /* --------------------------------------------------------------------- */ 1019 1020 int 1021 nilfs_statvfs(struct mount *mp, struct statvfs *sbp) 1022 { 1023 struct nilfs_mount *ump = VFSTONILFS(mp); 1024 uint32_t blocksize; 1025 1026 DPRINTF(VFSCALL, ("nilfs_statvfs called\n")); 1027 1028 blocksize = ump->nilfsdev->blocksize; 1029 sbp->f_flag = mp->mnt_flag; 1030 sbp->f_bsize = blocksize; 1031 sbp->f_frsize = blocksize; 1032 sbp->f_iosize = blocksize; 1033 1034 copy_statvfs_info(sbp, mp); 1035 return 0; 1036 } 1037 1038 /* --------------------------------------------------------------------- */ 1039 1040 int 1041 nilfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 1042 { 1043 // struct nilfs_mount *ump = VFSTONILFS(mp); 1044 1045 DPRINTF(VFSCALL, ("nilfs_sync called\n")); 1046 /* if called when mounted readonly, just ignore */ 1047 if (mp->mnt_flag & MNT_RDONLY) 1048 return 0; 1049 1050 DPRINTF(VFSCALL, ("end of nilfs_sync()\n")); 1051 1052 return 0; 1053 } 1054 1055 /* --------------------------------------------------------------------- */ 1056 1057 /* 1058 * Get vnode for the file system type specific file id ino for the fs. Its 1059 * used for reference to files by unique ID and for NFSv3. 1060 * (optional) TODO lookup why some sources state NFSv3 1061 */ 1062 int 1063 nilfs_vget(struct mount *mp, ino_t ino, 1064 struct vnode **vpp) 1065 { 1066 DPRINTF(NOTIMPL, ("nilfs_vget called\n")); 1067 return EOPNOTSUPP; 1068 } 1069 1070 /* --------------------------------------------------------------------- */ 1071 1072 /* 1073 * Lookup vnode for file handle specified 1074 */ 1075 int 1076 nilfs_fhtovp(struct mount *mp, struct fid *fhp, 1077 struct vnode **vpp) 1078 { 1079 DPRINTF(NOTIMPL, ("nilfs_fhtovp called\n")); 1080 return EOPNOTSUPP; 1081 } 1082 1083 /* --------------------------------------------------------------------- */ 1084 1085 /* 1086 * Create an unique file handle. Its structure is opaque and won't be used by 1087 * other subsystems. It should uniquely identify the file in the filingsystem 1088 * and enough information to know if a file has been removed and/or resources 1089 * have been recycled. 1090 */ 1091 int 1092 nilfs_vptofh(struct vnode *vp, struct fid *fid, 1093 size_t *fh_size) 1094 { 1095 DPRINTF(NOTIMPL, ("nilfs_vptofh called\n")); 1096 return EOPNOTSUPP; 1097 } 1098 1099 /* --------------------------------------------------------------------- */ 1100 1101 /* 1102 * Create a file system snapshot at the specified timestamp. 1103 */ 1104 int 1105 nilfs_snapshot(struct mount *mp, struct vnode *vp, 1106 struct timespec *tm) 1107 { 1108 DPRINTF(NOTIMPL, ("nilfs_snapshot called\n")); 1109 return EOPNOTSUPP; 1110 } 1111 1112 /* --------------------------------------------------------------------- */ 1113