| 1 | /*- |
| 2 | * Copyright (c) 2011, 2012 The DragonFly Project. All rights reserved. |
| 3 | * |
| 4 | * This code is derived from software contributed to The DragonFly Project |
| 5 | * by Matthew Dillon <dillon@backplane.com> |
| 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 | * |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in |
| 15 | * the documentation and/or other materials provided with the |
| 16 | * distribution. |
| 17 | * 3. Neither the name of The DragonFly Project nor the names of its |
| 18 | * contributors may be used to endorse or promote products derived |
| 19 | * from this software without specific, prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 22 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 23 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 24 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 25 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 26 | * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 27 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 28 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 29 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 30 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 31 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 32 | * SUCH DAMAGE. |
| 33 | */ |
| 34 | #include <sys/param.h> |
| 35 | #include <sys/systm.h> |
| 36 | #include <sys/kernel.h> |
| 37 | #include <sys/nlookup.h> |
| 38 | #include <sys/vnode.h> |
| 39 | #include <sys/mount.h> |
| 40 | #include <sys/fcntl.h> |
| 41 | #include <sys/buf.h> |
| 42 | #include <sys/uuid.h> |
| 43 | #include <sys/vfsops.h> |
| 44 | |
| 45 | #include "hammer2.h" |
| 46 | #include "hammer2_disk.h" |
| 47 | #include "hammer2_mount.h" |
| 48 | |
| 49 | static int hammer2_init(struct vfsconf *conf); |
| 50 | static int hammer2_mount(struct mount *mp, char *path, caddr_t data, |
| 51 | struct ucred *cred); |
| 52 | static int hammer2_remount(struct mount *, char *, struct vnode *, |
| 53 | struct ucred *); |
| 54 | static int hammer2_unmount(struct mount *mp, int mntflags); |
| 55 | static int hammer2_root(struct mount *mp, struct vnode **vpp); |
| 56 | static int hammer2_statfs(struct mount *mp, struct statfs *sbp, |
| 57 | struct ucred *cred); |
| 58 | static int hammer2_statvfs(struct mount *mp, struct statvfs *sbp, |
| 59 | struct ucred *cred); |
| 60 | static int hammer2_sync(struct mount *mp, int waitfor); |
| 61 | static int hammer2_vget(struct mount *mp, struct vnode *dvp, |
| 62 | ino_t ino, struct vnode **vpp); |
| 63 | static int hammer2_fhtovp(struct mount *mp, struct vnode *rootvp, |
| 64 | struct fid *fhp, struct vnode **vpp); |
| 65 | static int hammer2_vptofh(struct vnode *vp, struct fid *fhp); |
| 66 | static int hammer2_checkexp(struct mount *mp, struct sockaddr *nam, |
| 67 | int *exflagsp, struct ucred **credanonp); |
| 68 | |
| 69 | static int hammer2_install_volume_header(hammer2_mount_t *hmp); |
| 70 | |
| 71 | /* |
| 72 | * HAMMER2 vfs operations. |
| 73 | */ |
| 74 | static struct vfsops hammer2_vfsops = { |
| 75 | .vfs_init = hammer2_init, |
| 76 | .vfs_sync = hammer2_sync, |
| 77 | .vfs_mount = hammer2_mount, |
| 78 | .vfs_unmount = hammer2_unmount, |
| 79 | .vfs_root = hammer2_root, |
| 80 | .vfs_statfs = hammer2_statfs, |
| 81 | .vfs_statvfs = hammer2_statvfs, |
| 82 | .vfs_vget = hammer2_vget, |
| 83 | .vfs_vptofh = hammer2_vptofh, |
| 84 | .vfs_fhtovp = hammer2_fhtovp, |
| 85 | .vfs_checkexp = hammer2_checkexp |
| 86 | }; |
| 87 | |
| 88 | MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", ""); |
| 89 | |
| 90 | VFS_SET(hammer2_vfsops, hammer2, 0); |
| 91 | MODULE_VERSION(hammer2, 1); |
| 92 | |
| 93 | static |
| 94 | int |
| 95 | hammer2_init(struct vfsconf *conf) |
| 96 | { |
| 97 | int error; |
| 98 | |
| 99 | error = 0; |
| 100 | |
| 101 | if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref)) |
| 102 | error = EINVAL; |
| 103 | if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data)) |
| 104 | error = EINVAL; |
| 105 | if (HAMMER2_ALLOCREF_BYTES != sizeof(struct hammer2_allocref)) |
| 106 | error = EINVAL; |
| 107 | if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data)) |
| 108 | error = EINVAL; |
| 109 | |
| 110 | if (error) |
| 111 | kprintf("HAMMER2 structure size mismatch; cannot continue.\n"); |
| 112 | |
| 113 | return (error); |
| 114 | } |
| 115 | |
| 116 | /* |
| 117 | * Mount or remount HAMMER2 fileystem from physical media |
| 118 | * |
| 119 | * mountroot |
| 120 | * mp mount point structure |
| 121 | * path NULL |
| 122 | * data <unused> |
| 123 | * cred <unused> |
| 124 | * |
| 125 | * mount |
| 126 | * mp mount point structure |
| 127 | * path path to mount point |
| 128 | * data pointer to argument structure in user space |
| 129 | * volume volume path (device@LABEL form) |
| 130 | * hflags user mount flags |
| 131 | * cred user credentials |
| 132 | * |
| 133 | * RETURNS: 0 Success |
| 134 | * !0 error number |
| 135 | */ |
| 136 | static |
| 137 | int |
| 138 | hammer2_mount(struct mount *mp, char *path, caddr_t data, |
| 139 | struct ucred *cred) |
| 140 | { |
| 141 | struct hammer2_mount_info info; |
| 142 | hammer2_mount_t *hmp; |
| 143 | hammer2_key_t lhc; |
| 144 | struct vnode *devvp; |
| 145 | struct nlookupdata nd; |
| 146 | hammer2_chain_t *parent; |
| 147 | hammer2_chain_t *schain; |
| 148 | hammer2_chain_t *rchain; |
| 149 | char devstr[MNAMELEN]; |
| 150 | size_t size; |
| 151 | size_t done; |
| 152 | char *dev; |
| 153 | char *label; |
| 154 | int ronly = 1; |
| 155 | int error; |
| 156 | |
| 157 | hmp = NULL; |
| 158 | dev = NULL; |
| 159 | label = NULL; |
| 160 | devvp = NULL; |
| 161 | |
| 162 | kprintf("hammer2_mount\n"); |
| 163 | |
| 164 | if (path == NULL) { |
| 165 | /* |
| 166 | * Root mount |
| 167 | */ |
| 168 | return (EOPNOTSUPP); |
| 169 | } else { |
| 170 | /* |
| 171 | * Non-root mount or updating a mount |
| 172 | */ |
| 173 | error = copyin(data, &info, sizeof(info)); |
| 174 | if (error) |
| 175 | return (error); |
| 176 | |
| 177 | error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done); |
| 178 | if (error) |
| 179 | return (error); |
| 180 | |
| 181 | /* Extract device and label */ |
| 182 | dev = devstr; |
| 183 | label = strchr(devstr, '@'); |
| 184 | if (label == NULL || |
| 185 | ((label + 1) - dev) > done) { |
| 186 | return (EINVAL); |
| 187 | } |
| 188 | *label = '\0'; |
| 189 | label++; |
| 190 | if (*label == '\0') |
| 191 | return (EINVAL); |
| 192 | |
| 193 | if (mp->mnt_flag & MNT_UPDATE) { |
| 194 | /* Update mount */ |
| 195 | /* HAMMER2 implements NFS export via mountctl */ |
| 196 | hmp = MPTOH2(mp); |
| 197 | devvp = hmp->devvp; |
| 198 | error = hammer2_remount(mp, path, devvp, cred); |
| 199 | return error; |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | /* |
| 204 | * New non-root mount |
| 205 | */ |
| 206 | /* Lookup name and verify it refers to a block device */ |
| 207 | error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW); |
| 208 | if (error == 0) |
| 209 | error = nlookup(&nd); |
| 210 | if (error == 0) |
| 211 | error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); |
| 212 | nlookup_done(&nd); |
| 213 | |
| 214 | if (error == 0) { |
| 215 | if (vn_isdisk(devvp, &error)) |
| 216 | error = vfs_mountedon(devvp); |
| 217 | } |
| 218 | if (error == 0 && vcount(devvp) > 0) |
| 219 | error = EBUSY; |
| 220 | |
| 221 | /* |
| 222 | * Now open the device |
| 223 | */ |
| 224 | if (error == 0) { |
| 225 | ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); |
| 226 | vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); |
| 227 | error = vinvalbuf(devvp, V_SAVE, 0, 0); |
| 228 | if (error == 0) { |
| 229 | error = VOP_OPEN(devvp, ronly ? FREAD : FREAD | FWRITE, |
| 230 | FSCRED, NULL); |
| 231 | } |
| 232 | vn_unlock(devvp); |
| 233 | } |
| 234 | if (error && devvp) { |
| 235 | vrele(devvp); |
| 236 | devvp = NULL; |
| 237 | } |
| 238 | if (error) |
| 239 | return error; |
| 240 | |
| 241 | /* |
| 242 | * Block device opened successfully, finish initializing the |
| 243 | * mount structure. |
| 244 | * |
| 245 | * From this point on we have to call hammer2_unmount() on failure. |
| 246 | */ |
| 247 | hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO); |
| 248 | mp->mnt_data = (qaddr_t)hmp; |
| 249 | hmp->mp = mp; |
| 250 | hmp->ronly = ronly; |
| 251 | hmp->devvp = devvp; |
| 252 | kmalloc_create(&hmp->minode, "HAMMER2-inodes"); |
| 253 | kmalloc_create(&hmp->mchain, "HAMMER2-chains"); |
| 254 | |
| 255 | mp->mnt_flag = MNT_LOCAL; |
| 256 | mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; /* all entry pts are SMP */ |
| 257 | |
| 258 | /* |
| 259 | * vchain setup. vchain.data is special cased to NULL. vchain.refs |
| 260 | * is initialized and will never drop to 0. |
| 261 | */ |
| 262 | hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME; |
| 263 | hmp->vchain.refs = 1; |
| 264 | /* hmp->vchain.data is special cased to NULL */ |
| 265 | lockinit(&hmp->vchain.lk, "volume", 0, LK_CANRECURSE); |
| 266 | |
| 267 | /* |
| 268 | * Install the volume header |
| 269 | */ |
| 270 | error = hammer2_install_volume_header(hmp); |
| 271 | if (error) { |
| 272 | hammer2_unmount(mp, MNT_FORCE); |
| 273 | return error; |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * required mount structure initializations |
| 278 | */ |
| 279 | mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE; |
| 280 | mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE; |
| 281 | |
| 282 | mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE; |
| 283 | mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE; |
| 284 | |
| 285 | /* |
| 286 | * First locate the super-root inode, which is key 0 relative to the |
| 287 | * volume header's blockset. |
| 288 | * |
| 289 | * Then locate the root inode by scanning the directory keyspace |
| 290 | * represented by the label. |
| 291 | */ |
| 292 | lhc = hammer2_dirhash(label, strlen(label)); |
| 293 | parent = &hmp->vchain; |
| 294 | hammer2_chain_ref(hmp, parent); |
| 295 | hammer2_chain_lock(hmp, parent); |
| 296 | schain = hammer2_chain_lookup(hmp, &parent, |
| 297 | HAMMER2_SROOT_KEY, (hammer2_key_t)-1); |
| 298 | hammer2_chain_put(hmp, parent); |
| 299 | if (schain == NULL) { |
| 300 | kprintf("hammer2_mount: invalid super-root\n"); |
| 301 | hammer2_unmount(mp, MNT_FORCE); |
| 302 | return EINVAL; |
| 303 | } |
| 304 | |
| 305 | parent = schain; |
| 306 | hammer2_chain_ref(hmp, parent); |
| 307 | rchain = hammer2_chain_lookup(hmp, &parent, |
| 308 | lhc, HAMMER2_DIRHASH_HIMASK); |
| 309 | while (rchain) { |
| 310 | if (rchain->bref.type == HAMMER2_BREF_TYPE_INODE && |
| 311 | rchain->u.ip && |
| 312 | strcmp(label, rchain->data->ipdata.filename) == 0) { |
| 313 | break; |
| 314 | } |
| 315 | rchain = hammer2_chain_next(hmp, &parent, rchain, |
| 316 | lhc, HAMMER2_DIRHASH_HIMASK); |
| 317 | } |
| 318 | hammer2_chain_put(hmp, parent); |
| 319 | if (rchain == NULL) { |
| 320 | kprintf("hammer2_mount: root label not found\n"); |
| 321 | hammer2_chain_drop(hmp, schain); |
| 322 | hammer2_unmount(mp, MNT_FORCE); |
| 323 | return EINVAL; |
| 324 | } |
| 325 | |
| 326 | hmp->schain = schain; /* left held & unlocked */ |
| 327 | hmp->rchain = rchain; /* left held & unlocked */ |
| 328 | hmp->iroot = rchain->u.ip; /* implied hold from rchain */ |
| 329 | kprintf("iroot %p\n", rchain->u.ip); |
| 330 | |
| 331 | vfs_getnewfsid(mp); |
| 332 | vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops); |
| 333 | vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops); |
| 334 | vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops); |
| 335 | |
| 336 | copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); |
| 337 | bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); |
| 338 | bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname)); |
| 339 | copyinstr(path, mp->mnt_stat.f_mntonname, |
| 340 | sizeof(mp->mnt_stat.f_mntonname) - 1, |
| 341 | &size); |
| 342 | |
| 343 | hammer2_statfs(mp, &mp->mnt_stat, cred); |
| 344 | |
| 345 | return 0; |
| 346 | } |
| 347 | |
| 348 | static |
| 349 | int |
| 350 | hammer2_remount(struct mount *mp, char *path, struct vnode *devvp, |
| 351 | struct ucred *cred) |
| 352 | { |
| 353 | return (0); |
| 354 | } |
| 355 | |
| 356 | static |
| 357 | int |
| 358 | hammer2_unmount(struct mount *mp, int mntflags) |
| 359 | { |
| 360 | hammer2_mount_t *hmp; |
| 361 | int flags; |
| 362 | int error = 0; |
| 363 | int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); |
| 364 | struct vnode *devvp; |
| 365 | |
| 366 | kprintf("hammer2_unmount\n"); |
| 367 | |
| 368 | hmp = MPTOH2(mp); |
| 369 | flags = 0; |
| 370 | |
| 371 | if (mntflags & MNT_FORCE) |
| 372 | flags |= FORCECLOSE; |
| 373 | |
| 374 | hammer2_mount_exlock(hmp); |
| 375 | |
| 376 | /* |
| 377 | * If mount initialization proceeded far enough we must flush |
| 378 | * its vnodes. |
| 379 | */ |
| 380 | kprintf("iroot %p\n", hmp->iroot); |
| 381 | if (hmp->iroot) |
| 382 | error = vflush(mp, 0, flags); |
| 383 | |
| 384 | if (error) |
| 385 | return error; |
| 386 | |
| 387 | /* |
| 388 | * Work to do: |
| 389 | * 1) Wait on the flusher having no work; heat up if needed |
| 390 | * 2) Scan inode RB tree till all the inodes are free |
| 391 | * 3) Destroy the kmalloc inode zone |
| 392 | * 4) Free the mount point |
| 393 | */ |
| 394 | hmp->iroot = NULL; |
| 395 | if (hmp->rchain) { |
| 396 | KKASSERT(hmp->rchain->refs == 1); |
| 397 | hammer2_chain_drop(hmp, hmp->rchain); |
| 398 | hmp->rchain = NULL; |
| 399 | } |
| 400 | if (hmp->schain) { |
| 401 | KKASSERT(hmp->schain->refs == 1); |
| 402 | hammer2_chain_drop(hmp, hmp->schain); |
| 403 | hmp->schain = NULL; |
| 404 | } |
| 405 | if ((devvp = hmp->devvp) != NULL) { |
| 406 | vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0); |
| 407 | hmp->devvp = NULL; |
| 408 | VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE)); |
| 409 | vrele(devvp); |
| 410 | devvp = NULL; |
| 411 | } |
| 412 | |
| 413 | kmalloc_destroy(&hmp->minode); |
| 414 | kmalloc_destroy(&hmp->mchain); |
| 415 | |
| 416 | hammer2_mount_unlock(hmp); |
| 417 | |
| 418 | mp->mnt_data = NULL; |
| 419 | hmp->mp = NULL; |
| 420 | kfree(hmp, M_HAMMER2); |
| 421 | |
| 422 | return (error); |
| 423 | } |
| 424 | |
| 425 | static |
| 426 | int |
| 427 | hammer2_vget(struct mount *mp, struct vnode *dvp, |
| 428 | ino_t ino, struct vnode **vpp) |
| 429 | { |
| 430 | kprintf("hammer2_vget\n"); |
| 431 | return (EOPNOTSUPP); |
| 432 | } |
| 433 | |
| 434 | static |
| 435 | int |
| 436 | hammer2_root(struct mount *mp, struct vnode **vpp) |
| 437 | { |
| 438 | hammer2_mount_t *hmp; |
| 439 | int error; |
| 440 | struct vnode *vp; |
| 441 | |
| 442 | kprintf("hammer2_root\n"); |
| 443 | |
| 444 | hmp = MPTOH2(mp); |
| 445 | hammer2_mount_exlock(hmp); |
| 446 | if (hmp->iroot == NULL) { |
| 447 | *vpp = NULL; |
| 448 | error = EINVAL; |
| 449 | } else { |
| 450 | vp = hammer2_igetv(hmp->iroot, &error); |
| 451 | *vpp = vp; |
| 452 | if (vp == NULL) |
| 453 | kprintf("vnodefail\n"); |
| 454 | } |
| 455 | hammer2_mount_unlock(hmp); |
| 456 | |
| 457 | return (error); |
| 458 | } |
| 459 | |
| 460 | static |
| 461 | int |
| 462 | hammer2_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) |
| 463 | { |
| 464 | hammer2_mount_t *hmp; |
| 465 | |
| 466 | hmp = MPTOH2(mp); |
| 467 | |
| 468 | mp->mnt_stat.f_files = 10; |
| 469 | mp->mnt_stat.f_bfree = 10; |
| 470 | mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree; |
| 471 | |
| 472 | *sbp = mp->mnt_stat; |
| 473 | return (0); |
| 474 | } |
| 475 | |
| 476 | static |
| 477 | int |
| 478 | hammer2_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) |
| 479 | { |
| 480 | hammer2_mount_t *hmp; |
| 481 | |
| 482 | hmp = MPTOH2(mp); |
| 483 | |
| 484 | mp->mnt_vstat.f_files = 10; |
| 485 | mp->mnt_vstat.f_bfree = 10; |
| 486 | mp->mnt_vstat.f_bavail = mp->mnt_stat.f_bfree; |
| 487 | |
| 488 | *sbp = mp->mnt_vstat; |
| 489 | return (0); |
| 490 | } |
| 491 | |
| 492 | /* |
| 493 | * Sync the entire filesystem; this is called from the filesystem syncer |
| 494 | * process periodically and whenever a user calls sync(1) on the hammer |
| 495 | * mountpoint. |
| 496 | * |
| 497 | * Currently is actually called from the syncer! \o/ |
| 498 | * |
| 499 | * This task will have to snapshot the state of the dirty inode chain. |
| 500 | * From that, it will have to make sure all of the inodes on the dirty |
| 501 | * chain have IO initiated. We make sure that io is initiated for the root |
| 502 | * block. |
| 503 | * |
| 504 | * If waitfor is set, we wait for media to acknowledge the new rootblock. |
| 505 | * |
| 506 | * THINKS: side A vs side B, to have sync not stall all I/O? |
| 507 | */ |
| 508 | static |
| 509 | int |
| 510 | hammer2_sync(struct mount *mp, int waitfor) |
| 511 | { |
| 512 | #if 0 |
| 513 | hammer2_mount_t *hmp; |
| 514 | hammer2_inode_t *ip; |
| 515 | #endif |
| 516 | |
| 517 | kprintf("hammer2_sync \n"); |
| 518 | |
| 519 | #if 0 |
| 520 | hmp = MPTOH2(mp); |
| 521 | #endif |
| 522 | |
| 523 | return (0); |
| 524 | } |
| 525 | |
| 526 | static |
| 527 | int |
| 528 | hammer2_vptofh(struct vnode *vp, struct fid *fhp) |
| 529 | { |
| 530 | return (0); |
| 531 | } |
| 532 | |
| 533 | static |
| 534 | int |
| 535 | hammer2_fhtovp(struct mount *mp, struct vnode *rootvp, |
| 536 | struct fid *fhp, struct vnode **vpp) |
| 537 | { |
| 538 | return (0); |
| 539 | } |
| 540 | |
| 541 | static |
| 542 | int |
| 543 | hammer2_checkexp(struct mount *mp, struct sockaddr *nam, |
| 544 | int *exflagsp, struct ucred **credanonp) |
| 545 | { |
| 546 | return (0); |
| 547 | } |
| 548 | |
| 549 | /* |
| 550 | * Support code for hammer2_mount(). Read, verify, and install the volume |
| 551 | * header into the HMP |
| 552 | * |
| 553 | * XXX read four volhdrs and use the one with the highest TID whos CRC |
| 554 | * matches. |
| 555 | * |
| 556 | * XXX check iCRCs. |
| 557 | * |
| 558 | * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to |
| 559 | * nonexistant locations. |
| 560 | * |
| 561 | * XXX Record selected volhdr and ring updates to each of 4 volhdrs |
| 562 | */ |
| 563 | static |
| 564 | int |
| 565 | hammer2_install_volume_header(hammer2_mount_t *hmp) |
| 566 | { |
| 567 | hammer2_volume_data_t *vd; |
| 568 | struct buf *bp; |
| 569 | hammer2_crc32_t ccrc, crc; |
| 570 | int error_reported; |
| 571 | int error; |
| 572 | int valid; |
| 573 | int i; |
| 574 | |
| 575 | error_reported = 0; |
| 576 | error = 0; |
| 577 | valid = 0; |
| 578 | bp = NULL; |
| 579 | |
| 580 | /* |
| 581 | * There are up to 4 copies of the volume header (syncs iterate |
| 582 | * between them so there is no single master). We don't trust the |
| 583 | * volu_size field so we don't know precisely how large the filesystem |
| 584 | * is, so depend on the OS to return an error if we go beyond the |
| 585 | * block device's EOF. |
| 586 | */ |
| 587 | for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) { |
| 588 | error = bread(hmp->devvp, i * HAMMER2_RESERVE_BYTES64, |
| 589 | HAMMER2_VOLUME_BYTES, &bp); |
| 590 | if (error) { |
| 591 | brelse(bp); |
| 592 | bp = NULL; |
| 593 | continue; |
| 594 | } |
| 595 | |
| 596 | vd = (struct hammer2_volume_data *)bp->b_data; |
| 597 | if (vd->magic != HAMMER2_VOLUME_ID_HBO) |
| 598 | continue; |
| 599 | |
| 600 | crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0]; |
| 601 | ccrc = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF, |
| 602 | HAMMER2_VOLUME_ICRC0_SIZE); |
| 603 | if (ccrc != crc) { |
| 604 | kprintf("hammer2 volume header crc " |
| 605 | "mismatch copy #%d\t%08x %08x", |
| 606 | i, ccrc, crc); |
| 607 | error_reported = 1; |
| 608 | brelse(bp); |
| 609 | bp = NULL; |
| 610 | continue; |
| 611 | } |
| 612 | if (valid == 0 || hmp->voldata.last_tid < vd->last_tid) { |
| 613 | valid = 1; |
| 614 | hmp->voldata = *vd; |
| 615 | } |
| 616 | brelse(bp); |
| 617 | bp = NULL; |
| 618 | } |
| 619 | if (valid) { |
| 620 | error = 0; |
| 621 | if (error_reported) |
| 622 | kprintf("hammer2: a valid volume header was found\n"); |
| 623 | } else { |
| 624 | error = EINVAL; |
| 625 | kprintf("hammer2: no valid volume headers found!\n"); |
| 626 | } |
| 627 | return (error); |
| 628 | } |
| 629 | |