1 /* 2 * Copyright (c) 2007-2008 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 * $DragonFly: src/sys/vfs/hammer/hammer_vfsops.c,v 1.74 2008/11/13 02:18:43 dillon Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/vnode.h> 41 #include <sys/mount.h> 42 #include <sys/malloc.h> 43 #include <sys/nlookup.h> 44 #include <sys/fcntl.h> 45 #include <sys/sysctl.h> 46 #include <sys/buf.h> 47 #include <sys/buf2.h> 48 #include "hammer.h" 49 50 int hammer_debug_io; 51 int hammer_debug_general; 52 int hammer_debug_debug = 1; /* medium-error panics */ 53 int hammer_debug_inode; 54 int hammer_debug_locks; 55 int hammer_debug_btree; 56 int hammer_debug_tid; 57 int hammer_debug_recover; /* -1 will disable, +1 will force */ 58 int hammer_debug_recover_faults; 59 int hammer_cluster_enable = 1; /* enable read clustering by default */ 60 int hammer_count_fsyncs; 61 int hammer_count_inodes; 62 int hammer_count_iqueued; 63 int hammer_count_reclaiming; 64 int hammer_count_records; 65 int hammer_count_record_datas; 66 int hammer_count_volumes; 67 int hammer_count_buffers; 68 int hammer_count_nodes; 69 int64_t hammer_count_extra_space_used; 70 int64_t hammer_stats_btree_lookups; 71 int64_t hammer_stats_btree_searches; 72 int64_t hammer_stats_btree_inserts; 73 int64_t hammer_stats_btree_deletes; 74 int64_t hammer_stats_btree_elements; 75 int64_t hammer_stats_btree_splits; 76 int64_t hammer_stats_btree_iterations; 77 int64_t hammer_stats_record_iterations; 78 79 int64_t hammer_stats_file_read; 80 int64_t hammer_stats_file_write; 81 int64_t hammer_stats_file_iopsr; 82 int64_t hammer_stats_file_iopsw; 83 int64_t hammer_stats_disk_read; 84 int64_t hammer_stats_disk_write; 85 int64_t hammer_stats_inode_flushes; 86 int64_t hammer_stats_commits; 87 88 int hammer_count_dirtybufspace; /* global */ 89 int hammer_count_refedbufs; /* global */ 90 int hammer_count_reservations; 91 int hammer_count_io_running_read; 92 int hammer_count_io_running_write; 93 int hammer_count_io_locked; 94 int hammer_limit_dirtybufspace; /* per-mount */ 95 int hammer_limit_recs; /* as a whole XXX */ 96 int hammer_limit_iqueued; /* per-mount */ 97 int hammer_autoflush = 2000; /* auto flush */ 98 int hammer_bio_count; 99 int hammer_verify_zone; 100 int hammer_verify_data = 1; 101 int hammer_write_mode; 102 int64_t hammer_contention_count; 103 int64_t hammer_zone_limit; 104 105 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem"); 106 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW, 107 &hammer_debug_general, 0, ""); 108 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW, 109 &hammer_debug_io, 0, ""); 110 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW, 111 &hammer_debug_debug, 0, ""); 112 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW, 113 &hammer_debug_inode, 0, ""); 114 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW, 115 &hammer_debug_locks, 0, ""); 116 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW, 117 &hammer_debug_btree, 0, ""); 118 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW, 119 &hammer_debug_tid, 0, ""); 120 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW, 121 &hammer_debug_recover, 0, ""); 122 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW, 123 &hammer_debug_recover_faults, 0, ""); 124 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW, 125 &hammer_cluster_enable, 0, ""); 126 127 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW, 128 &hammer_limit_dirtybufspace, 0, ""); 129 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW, 130 &hammer_limit_recs, 0, ""); 131 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_iqueued, CTLFLAG_RW, 132 &hammer_limit_iqueued, 0, ""); 133 134 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD, 135 &hammer_count_fsyncs, 0, ""); 136 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD, 137 &hammer_count_inodes, 0, ""); 138 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD, 139 &hammer_count_iqueued, 0, ""); 140 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD, 141 &hammer_count_reclaiming, 0, ""); 142 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD, 143 &hammer_count_records, 0, ""); 144 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD, 145 &hammer_count_record_datas, 0, ""); 146 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD, 147 &hammer_count_volumes, 0, ""); 148 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD, 149 &hammer_count_buffers, 0, ""); 150 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD, 151 &hammer_count_nodes, 0, ""); 152 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD, 153 &hammer_count_extra_space_used, 0, ""); 154 155 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD, 156 &hammer_stats_btree_searches, 0, ""); 157 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD, 158 &hammer_stats_btree_lookups, 0, ""); 159 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD, 160 &hammer_stats_btree_inserts, 0, ""); 161 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD, 162 &hammer_stats_btree_deletes, 0, ""); 163 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD, 164 &hammer_stats_btree_elements, 0, ""); 165 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD, 166 &hammer_stats_btree_splits, 0, ""); 167 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD, 168 &hammer_stats_btree_iterations, 0, ""); 169 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD, 170 &hammer_stats_record_iterations, 0, ""); 171 172 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD, 173 &hammer_stats_file_read, 0, ""); 174 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD, 175 &hammer_stats_file_write, 0, ""); 176 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD, 177 &hammer_stats_file_iopsr, 0, ""); 178 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD, 179 &hammer_stats_file_iopsw, 0, ""); 180 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD, 181 &hammer_stats_disk_read, 0, ""); 182 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD, 183 &hammer_stats_disk_write, 0, ""); 184 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD, 185 &hammer_stats_inode_flushes, 0, ""); 186 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD, 187 &hammer_stats_commits, 0, ""); 188 189 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD, 190 &hammer_count_dirtybufspace, 0, ""); 191 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD, 192 &hammer_count_refedbufs, 0, ""); 193 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD, 194 &hammer_count_reservations, 0, ""); 195 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD, 196 &hammer_count_io_running_read, 0, ""); 197 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD, 198 &hammer_count_io_locked, 0, ""); 199 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD, 200 &hammer_count_io_running_write, 0, ""); 201 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW, 202 &hammer_zone_limit, 0, ""); 203 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW, 204 &hammer_contention_count, 0, ""); 205 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW, 206 &hammer_autoflush, 0, ""); 207 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW, 208 &hammer_verify_zone, 0, ""); 209 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW, 210 &hammer_verify_data, 0, ""); 211 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW, 212 &hammer_write_mode, 0, ""); 213 214 KTR_INFO_MASTER(hammer); 215 216 /* 217 * VFS ABI 218 */ 219 static void hammer_free_hmp(struct mount *mp); 220 221 static int hammer_vfs_mount(struct mount *mp, char *path, caddr_t data, 222 struct ucred *cred); 223 static int hammer_vfs_unmount(struct mount *mp, int mntflags); 224 static int hammer_vfs_root(struct mount *mp, struct vnode **vpp); 225 static int hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, 226 struct ucred *cred); 227 static int hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, 228 struct ucred *cred); 229 static int hammer_vfs_sync(struct mount *mp, int waitfor); 230 static int hammer_vfs_vget(struct mount *mp, ino_t ino, 231 struct vnode **vpp); 232 static int hammer_vfs_init(struct vfsconf *conf); 233 static int hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 234 struct fid *fhp, struct vnode **vpp); 235 static int hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp); 236 static int hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 237 int *exflagsp, struct ucred **credanonp); 238 239 240 static struct vfsops hammer_vfsops = { 241 .vfs_mount = hammer_vfs_mount, 242 .vfs_unmount = hammer_vfs_unmount, 243 .vfs_root = hammer_vfs_root, 244 .vfs_statfs = hammer_vfs_statfs, 245 .vfs_statvfs = hammer_vfs_statvfs, 246 .vfs_sync = hammer_vfs_sync, 247 .vfs_vget = hammer_vfs_vget, 248 .vfs_init = hammer_vfs_init, 249 .vfs_vptofh = hammer_vfs_vptofh, 250 .vfs_fhtovp = hammer_vfs_fhtovp, 251 .vfs_checkexp = hammer_vfs_checkexp 252 }; 253 254 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", ""); 255 256 VFS_SET(hammer_vfsops, hammer, 0); 257 MODULE_VERSION(hammer, 1); 258 259 static int 260 hammer_vfs_init(struct vfsconf *conf) 261 { 262 int n; 263 264 if (hammer_limit_recs == 0) { 265 hammer_limit_recs = nbuf * 25; 266 n = kmalloc_limit(M_HAMMER) / 512; 267 if (hammer_limit_recs > n) 268 hammer_limit_recs = n; 269 } 270 if (hammer_limit_dirtybufspace == 0) { 271 hammer_limit_dirtybufspace = hidirtybufspace / 2; 272 if (hammer_limit_dirtybufspace < 100) 273 hammer_limit_dirtybufspace = 100; 274 } 275 if (hammer_limit_iqueued == 0) 276 hammer_limit_iqueued = desiredvnodes / 5; 277 return(0); 278 } 279 280 static int 281 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data, 282 struct ucred *cred) 283 { 284 struct hammer_mount_info info; 285 hammer_mount_t hmp; 286 hammer_volume_t rootvol; 287 struct vnode *rootvp; 288 struct vnode *devvp = NULL; 289 const char *upath; /* volume name in userspace */ 290 char *path; /* volume name in system space */ 291 int error; 292 int i; 293 int master_id; 294 int maxinodes; 295 296 /* 297 * Accept hammer_mount_info. mntpt is NULL for root mounts at boot. 298 */ 299 if (mntpt == NULL) { 300 if ((error = bdevvp(rootdev, &devvp))) { 301 kprintf("hammer_mountroot: can't find devvp\n"); 302 return (error); 303 } 304 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */ 305 bzero(&info, sizeof(info)); 306 info.asof = 0; 307 info.hflags = 0; 308 info.nvolumes = 1; 309 } else { 310 if ((error = copyin(data, &info, sizeof(info))) != 0) 311 return (error); 312 } 313 314 /* 315 * updating or new mount 316 */ 317 if (mp->mnt_flag & MNT_UPDATE) { 318 hmp = (void *)mp->mnt_data; 319 KKASSERT(hmp != NULL); 320 } else { 321 if (info.nvolumes <= 0 || info.nvolumes >= 32768) 322 return (EINVAL); 323 hmp = NULL; 324 } 325 326 /* 327 * master-id validation. The master id may not be changed by a 328 * mount update. 329 */ 330 if (info.hflags & HMNT_MASTERID) { 331 if (hmp && hmp->master_id != info.master_id) { 332 kprintf("hammer: cannot change master id " 333 "with mount update\n"); 334 return(EINVAL); 335 } 336 master_id = info.master_id; 337 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS) 338 return (EINVAL); 339 } else { 340 if (hmp) 341 master_id = hmp->master_id; 342 else 343 master_id = 0; 344 } 345 346 /* 347 * Interal mount data structure 348 */ 349 if (hmp == NULL) { 350 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO); 351 mp->mnt_data = (qaddr_t)hmp; 352 hmp->mp = mp; 353 /*TAILQ_INIT(&hmp->recycle_list);*/ 354 355 /* 356 * Make sure kmalloc type limits are set appropriately. If root 357 * increases the vnode limit you may have to do a dummy remount 358 * to adjust the HAMMER inode limit. 359 */ 360 kmalloc_create(&hmp->m_misc, "HAMMER-others"); 361 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes"); 362 363 maxinodes = desiredvnodes + desiredvnodes / 5 + 364 HAMMER_RECLAIM_WAIT; 365 kmalloc_raise_limit(hmp->m_inodes, 366 maxinodes * sizeof(struct hammer_inode)); 367 368 hmp->root_btree_beg.localization = 0x00000000U; 369 hmp->root_btree_beg.obj_id = -0x8000000000000000LL; 370 hmp->root_btree_beg.key = -0x8000000000000000LL; 371 hmp->root_btree_beg.create_tid = 1; 372 hmp->root_btree_beg.delete_tid = 1; 373 hmp->root_btree_beg.rec_type = 0; 374 hmp->root_btree_beg.obj_type = 0; 375 376 hmp->root_btree_end.localization = 0xFFFFFFFFU; 377 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL; 378 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL; 379 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL; 380 hmp->root_btree_end.delete_tid = 0; /* special case */ 381 hmp->root_btree_end.rec_type = 0xFFFFU; 382 hmp->root_btree_end.obj_type = 0; 383 384 hmp->krate.freq = 1; /* maximum reporting rate (hz) */ 385 hmp->krate.count = -16; /* initial burst */ 386 387 hmp->sync_lock.refs = 1; 388 hmp->free_lock.refs = 1; 389 hmp->undo_lock.refs = 1; 390 hmp->blkmap_lock.refs = 1; 391 392 TAILQ_INIT(&hmp->delay_list); 393 TAILQ_INIT(&hmp->flush_group_list); 394 TAILQ_INIT(&hmp->objid_cache_list); 395 TAILQ_INIT(&hmp->undo_lru_list); 396 TAILQ_INIT(&hmp->reclaim_list); 397 } 398 hmp->hflags &= ~HMNT_USERFLAGS; 399 hmp->hflags |= info.hflags & HMNT_USERFLAGS; 400 401 hmp->master_id = master_id; 402 403 if (info.asof) { 404 mp->mnt_flag |= MNT_RDONLY; 405 hmp->asof = info.asof; 406 } else { 407 hmp->asof = HAMMER_MAX_TID; 408 } 409 410 /* 411 * Re-open read-write if originally read-only, or vise-versa. 412 */ 413 if (mp->mnt_flag & MNT_UPDATE) { 414 error = 0; 415 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 416 kprintf("HAMMER read-only -> read-write\n"); 417 hmp->ronly = 0; 418 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 419 hammer_adjust_volume_mode, NULL); 420 rootvol = hammer_get_root_volume(hmp, &error); 421 if (rootvol) { 422 hammer_recover_flush_buffers(hmp, rootvol, 1); 423 bcopy(rootvol->ondisk->vol0_blockmap, 424 hmp->blockmap, 425 sizeof(hmp->blockmap)); 426 hammer_rel_volume(rootvol, 0); 427 } 428 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 429 hammer_reload_inode, NULL); 430 /* kernel clears MNT_RDONLY */ 431 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 432 kprintf("HAMMER read-write -> read-only\n"); 433 hmp->ronly = 1; /* messy */ 434 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 435 hammer_reload_inode, NULL); 436 hmp->ronly = 0; 437 hammer_flusher_sync(hmp); 438 hammer_flusher_sync(hmp); 439 hammer_flusher_sync(hmp); 440 hmp->ronly = 1; 441 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 442 hammer_adjust_volume_mode, NULL); 443 } 444 return(error); 445 } 446 447 RB_INIT(&hmp->rb_vols_root); 448 RB_INIT(&hmp->rb_inos_root); 449 RB_INIT(&hmp->rb_nods_root); 450 RB_INIT(&hmp->rb_undo_root); 451 RB_INIT(&hmp->rb_resv_root); 452 RB_INIT(&hmp->rb_bufs_root); 453 RB_INIT(&hmp->rb_pfsm_root); 454 455 hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); 456 457 TAILQ_INIT(&hmp->volu_list); 458 TAILQ_INIT(&hmp->undo_list); 459 TAILQ_INIT(&hmp->data_list); 460 TAILQ_INIT(&hmp->meta_list); 461 TAILQ_INIT(&hmp->lose_list); 462 463 /* 464 * Load volumes 465 */ 466 path = objcache_get(namei_oc, M_WAITOK); 467 hmp->nvolumes = -1; 468 for (i = 0; i < info.nvolumes; ++i) { 469 if (mntpt == NULL) { 470 /* 471 * Root mount. 472 * Only one volume; and no need for copyin. 473 */ 474 KKASSERT(info.nvolumes == 1); 475 ksnprintf(path, MAXPATHLEN, "/dev/%s", 476 mp->mnt_stat.f_mntfromname); 477 error = 0; 478 } else { 479 error = copyin(&info.volumes[i], &upath, 480 sizeof(char *)); 481 if (error == 0) 482 error = copyinstr(upath, path, 483 MAXPATHLEN, NULL); 484 } 485 if (error == 0) 486 error = hammer_install_volume(hmp, path, devvp); 487 if (error) 488 break; 489 } 490 objcache_put(namei_oc, path); 491 492 /* 493 * Make sure we found a root volume 494 */ 495 if (error == 0 && hmp->rootvol == NULL) { 496 kprintf("hammer_mount: No root volume found!\n"); 497 error = EINVAL; 498 } 499 500 /* 501 * Check that all required volumes are available 502 */ 503 if (error == 0 && hammer_mountcheck_volumes(hmp)) { 504 kprintf("hammer_mount: Missing volumes, cannot mount!\n"); 505 error = EINVAL; 506 } 507 508 if (error) { 509 hammer_free_hmp(mp); 510 return (error); 511 } 512 513 /* 514 * No errors, setup enough of the mount point so we can lookup the 515 * root vnode. 516 */ 517 mp->mnt_iosize_max = MAXPHYS; 518 mp->mnt_kern_flag |= MNTK_FSMID; 519 520 /* 521 * note: f_iosize is used by vnode_pager_haspage() when constructing 522 * its VOP_BMAP call. 523 */ 524 mp->mnt_stat.f_iosize = HAMMER_BUFSIZE; 525 mp->mnt_stat.f_bsize = HAMMER_BUFSIZE; 526 527 mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE; 528 mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE; 529 530 mp->mnt_maxsymlinklen = 255; 531 mp->mnt_flag |= MNT_LOCAL; 532 533 vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops); 534 vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops); 535 vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops); 536 537 /* 538 * The root volume's ondisk pointer is only valid if we hold a 539 * reference to it. 540 */ 541 rootvol = hammer_get_root_volume(hmp, &error); 542 if (error) 543 goto failed; 544 545 /* 546 * Perform any necessary UNDO operations. The recovery code does 547 * call hammer_undo_lookup() so we have to pre-cache the blockmap, 548 * and then re-copy it again after recovery is complete. 549 * 550 * If this is a read-only mount the UNDO information is retained 551 * in memory in the form of dirty buffer cache buffers, and not 552 * written back to the media. 553 */ 554 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, 555 sizeof(hmp->blockmap)); 556 557 /* 558 * Check filesystem version 559 */ 560 hmp->version = rootvol->ondisk->vol_version; 561 if (hmp->version < HAMMER_VOL_VERSION_MIN || 562 hmp->version > HAMMER_VOL_VERSION_MAX) { 563 kprintf("HAMMER: mount unsupported fs version %d\n", 564 hmp->version); 565 error = ERANGE; 566 goto done; 567 } 568 569 /* 570 * The undo_rec_limit limits the size of flush groups to avoid 571 * blowing out the UNDO FIFO. This calculation is typically in 572 * the tens of thousands and is designed primarily when small 573 * HAMMER filesystems are created. 574 */ 575 hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100; 576 if (hammer_debug_general & 0x0001) 577 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit); 578 579 error = hammer_recover(hmp, rootvol); 580 if (error) { 581 kprintf("Failed to recover HAMMER filesystem on mount\n"); 582 goto done; 583 } 584 585 /* 586 * Finish setup now that we have a good root volume. 587 * 588 * The top 16 bits of fsid.val[1] is a pfs id. 589 */ 590 ksnprintf(mp->mnt_stat.f_mntfromname, 591 sizeof(mp->mnt_stat.f_mntfromname), "%s", 592 rootvol->ondisk->vol_name); 593 mp->mnt_stat.f_fsid.val[0] = 594 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8); 595 mp->mnt_stat.f_fsid.val[1] = 596 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8); 597 mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF; 598 599 mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid; 600 mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid, 601 sizeof(mp->mnt_vstat.f_fsid_uuid)); 602 603 /* 604 * Certain often-modified fields in the root volume are cached in 605 * the hammer_mount structure so we do not have to generate lots 606 * of little UNDO structures for them. 607 * 608 * Recopy after recovery. This also has the side effect of 609 * setting our cached undo FIFO's first_offset, which serves to 610 * placemark the FIFO start for the NEXT flush cycle while the 611 * on-disk first_offset represents the LAST flush cycle. 612 */ 613 hmp->next_tid = rootvol->ondisk->vol0_next_tid; 614 hmp->flush_tid1 = hmp->next_tid; 615 hmp->flush_tid2 = hmp->next_tid; 616 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, 617 sizeof(hmp->blockmap)); 618 hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks; 619 620 hammer_flusher_create(hmp); 621 622 /* 623 * Locate the root directory using the root cluster's B-Tree as a 624 * starting point. The root directory uses an obj_id of 1. 625 * 626 * FUTURE: Leave the root directory cached referenced but unlocked 627 * in hmp->rootvp (need to flush it on unmount). 628 */ 629 error = hammer_vfs_vget(mp, 1, &rootvp); 630 if (error) 631 goto done; 632 vput(rootvp); 633 /*vn_unlock(hmp->rootvp);*/ 634 635 done: 636 hammer_rel_volume(rootvol, 0); 637 failed: 638 /* 639 * Cleanup and return. 640 */ 641 if (error) 642 hammer_free_hmp(mp); 643 return (error); 644 } 645 646 static int 647 hammer_vfs_unmount(struct mount *mp, int mntflags) 648 { 649 #if 0 650 struct hammer_mount *hmp = (void *)mp->mnt_data; 651 #endif 652 int flags; 653 int error; 654 655 /* 656 * Clean out the vnodes 657 */ 658 flags = 0; 659 if (mntflags & MNT_FORCE) 660 flags |= FORCECLOSE; 661 if ((error = vflush(mp, 0, flags)) != 0) 662 return (error); 663 664 /* 665 * Clean up the internal mount structure and related entities. This 666 * may issue I/O. 667 */ 668 hammer_free_hmp(mp); 669 return(0); 670 } 671 672 /* 673 * Clean up the internal mount structure and disassociate it from the mount. 674 * This may issue I/O. 675 */ 676 static void 677 hammer_free_hmp(struct mount *mp) 678 { 679 struct hammer_mount *hmp = (void *)mp->mnt_data; 680 hammer_flush_group_t flg; 681 int count; 682 683 /* 684 * Flush anything dirty. This won't even run if the 685 * filesystem errored-out. 686 */ 687 count = 0; 688 while (hammer_flusher_haswork(hmp)) { 689 hammer_flusher_sync(hmp); 690 ++count; 691 if (count >= 5) { 692 if (count == 5) 693 kprintf("HAMMER: umount flushing."); 694 else 695 kprintf("."); 696 tsleep(hmp, 0, "hmrufl", hz); 697 } 698 if (count == 30) { 699 kprintf("giving up\n"); 700 break; 701 } 702 } 703 if (count >= 5 && count < 30) 704 kprintf("\n"); 705 706 /* 707 * If the mount had a critical error we have to destroy any 708 * remaining inodes before we can finish cleaning up the flusher. 709 */ 710 if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) { 711 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 712 hammer_destroy_inode_callback, NULL); 713 } 714 715 /* 716 * There shouldn't be any inodes left now and any left over 717 * flush groups should now be empty. 718 */ 719 KKASSERT(RB_EMPTY(&hmp->rb_inos_root)); 720 while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) { 721 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry); 722 KKASSERT(TAILQ_EMPTY(&flg->flush_list)); 723 if (flg->refs) { 724 kprintf("HAMMER: Warning, flush_group %p was " 725 "not empty on umount!\n", flg); 726 } 727 kfree(flg, hmp->m_misc); 728 } 729 730 /* 731 * We can finally destroy the flusher 732 */ 733 hammer_flusher_destroy(hmp); 734 735 /* 736 * We may have held recovered buffers due to a read-only mount. 737 * These must be discarded. 738 */ 739 if (hmp->ronly) 740 hammer_recover_flush_buffers(hmp, NULL, -1); 741 742 /* 743 * Unload buffers and then volumes 744 */ 745 RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL, 746 hammer_unload_buffer, NULL); 747 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 748 hammer_unload_volume, NULL); 749 750 mp->mnt_data = NULL; 751 mp->mnt_flag &= ~MNT_LOCAL; 752 hmp->mp = NULL; 753 hammer_destroy_objid_cache(hmp); 754 kmalloc_destroy(&hmp->m_misc); 755 kmalloc_destroy(&hmp->m_inodes); 756 kfree(hmp, M_HAMMER); 757 } 758 759 /* 760 * Report critical errors. ip may be NULL. 761 */ 762 void 763 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip, 764 int error, const char *msg) 765 { 766 hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR; 767 krateprintf(&hmp->krate, 768 "HAMMER(%s): Critical error inode=%lld %s\n", 769 hmp->mp->mnt_stat.f_mntfromname, 770 (ip ? ip->obj_id : -1), msg); 771 if (hmp->ronly == 0) { 772 hmp->ronly = 2; /* special errored read-only mode */ 773 hmp->mp->mnt_flag |= MNT_RDONLY; 774 kprintf("HAMMER(%s): Forcing read-only mode\n", 775 hmp->mp->mnt_stat.f_mntfromname); 776 } 777 hmp->error = error; 778 } 779 780 781 /* 782 * Obtain a vnode for the specified inode number. An exclusively locked 783 * vnode is returned. 784 */ 785 int 786 hammer_vfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 787 { 788 struct hammer_transaction trans; 789 struct hammer_mount *hmp = (void *)mp->mnt_data; 790 struct hammer_inode *ip; 791 int error; 792 793 hammer_simple_transaction(&trans, hmp); 794 795 /* 796 * Lookup the requested HAMMER inode. The structure must be 797 * left unlocked while we manipulate the related vnode to avoid 798 * a deadlock. 799 */ 800 ip = hammer_get_inode(&trans, NULL, ino, 801 hmp->asof, HAMMER_DEF_LOCALIZATION, 802 0, &error); 803 if (ip == NULL) { 804 *vpp = NULL; 805 hammer_done_transaction(&trans); 806 return(error); 807 } 808 error = hammer_get_vnode(ip, vpp); 809 hammer_rel_inode(ip, 0); 810 hammer_done_transaction(&trans); 811 return (error); 812 } 813 814 /* 815 * Return the root vnode for the filesystem. 816 * 817 * HAMMER stores the root vnode in the hammer_mount structure so 818 * getting it is easy. 819 */ 820 static int 821 hammer_vfs_root(struct mount *mp, struct vnode **vpp) 822 { 823 #if 0 824 struct hammer_mount *hmp = (void *)mp->mnt_data; 825 #endif 826 int error; 827 828 error = hammer_vfs_vget(mp, 1, vpp); 829 return (error); 830 } 831 832 static int 833 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 834 { 835 struct hammer_mount *hmp = (void *)mp->mnt_data; 836 hammer_volume_t volume; 837 hammer_volume_ondisk_t ondisk; 838 int error; 839 int64_t bfree; 840 841 volume = hammer_get_root_volume(hmp, &error); 842 if (error) 843 return(error); 844 ondisk = volume->ondisk; 845 846 /* 847 * Basic stats 848 */ 849 mp->mnt_stat.f_files = ondisk->vol0_stat_inodes; 850 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE; 851 hammer_rel_volume(volume, 0); 852 853 mp->mnt_stat.f_bfree = bfree / HAMMER_BUFSIZE; 854 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree; 855 if (mp->mnt_stat.f_files < 0) 856 mp->mnt_stat.f_files = 0; 857 858 *sbp = mp->mnt_stat; 859 return(0); 860 } 861 862 static int 863 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 864 { 865 struct hammer_mount *hmp = (void *)mp->mnt_data; 866 hammer_volume_t volume; 867 hammer_volume_ondisk_t ondisk; 868 int error; 869 int64_t bfree; 870 871 volume = hammer_get_root_volume(hmp, &error); 872 if (error) 873 return(error); 874 ondisk = volume->ondisk; 875 876 /* 877 * Basic stats 878 */ 879 mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes; 880 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE; 881 hammer_rel_volume(volume, 0); 882 883 mp->mnt_vstat.f_bfree = bfree / HAMMER_BUFSIZE; 884 mp->mnt_vstat.f_bavail = mp->mnt_stat.f_bfree; 885 if (mp->mnt_vstat.f_files < 0) 886 mp->mnt_vstat.f_files = 0; 887 *sbp = mp->mnt_vstat; 888 return(0); 889 } 890 891 /* 892 * Sync the filesystem. Currently we have to run it twice, the second 893 * one will advance the undo start index to the end index, so if a crash 894 * occurs no undos will be run on mount. 895 * 896 * We do not sync the filesystem if we are called from a panic. If we did 897 * we might end up blowing up a sync that was already in progress. 898 */ 899 static int 900 hammer_vfs_sync(struct mount *mp, int waitfor) 901 { 902 struct hammer_mount *hmp = (void *)mp->mnt_data; 903 int error; 904 905 if (panicstr == NULL) { 906 error = hammer_sync_hmp(hmp, waitfor); 907 } else { 908 error = EIO; 909 } 910 return (error); 911 } 912 913 /* 914 * Convert a vnode to a file handle. 915 */ 916 static int 917 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp) 918 { 919 hammer_inode_t ip; 920 921 KKASSERT(MAXFIDSZ >= 16); 922 ip = VTOI(vp); 923 fhp->fid_len = offsetof(struct fid, fid_data[16]); 924 fhp->fid_ext = ip->obj_localization >> 16; 925 bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id)); 926 bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof)); 927 return(0); 928 } 929 930 931 /* 932 * Convert a file handle back to a vnode. 933 * 934 * Use rootvp to enforce PFS isolation when a PFS is exported via a 935 * null mount. 936 */ 937 static int 938 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 939 struct fid *fhp, struct vnode **vpp) 940 { 941 struct hammer_transaction trans; 942 struct hammer_inode *ip; 943 struct hammer_inode_info info; 944 int error; 945 u_int32_t localization; 946 947 bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id)); 948 bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof)); 949 if (rootvp) 950 localization = VTOI(rootvp)->obj_localization; 951 else 952 localization = (u_int32_t)fhp->fid_ext << 16; 953 954 hammer_simple_transaction(&trans, (void *)mp->mnt_data); 955 956 /* 957 * Get/allocate the hammer_inode structure. The structure must be 958 * unlocked while we manipulate the related vnode to avoid a 959 * deadlock. 960 */ 961 ip = hammer_get_inode(&trans, NULL, info.obj_id, 962 info.obj_asof, localization, 0, &error); 963 if (ip == NULL) { 964 *vpp = NULL; 965 return(error); 966 } 967 error = hammer_get_vnode(ip, vpp); 968 hammer_rel_inode(ip, 0); 969 hammer_done_transaction(&trans); 970 return (error); 971 } 972 973 static int 974 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 975 int *exflagsp, struct ucred **credanonp) 976 { 977 hammer_mount_t hmp = (void *)mp->mnt_data; 978 struct netcred *np; 979 int error; 980 981 np = vfs_export_lookup(mp, &hmp->export, nam); 982 if (np) { 983 *exflagsp = np->netc_exflags; 984 *credanonp = &np->netc_anon; 985 error = 0; 986 } else { 987 error = EACCES; 988 } 989 return (error); 990 991 } 992 993 int 994 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export) 995 { 996 hammer_mount_t hmp = (void *)mp->mnt_data; 997 int error; 998 999 switch(op) { 1000 case MOUNTCTL_SET_EXPORT: 1001 error = vfs_export(mp, &hmp->export, export); 1002 break; 1003 default: 1004 error = EOPNOTSUPP; 1005 break; 1006 } 1007 return(error); 1008 } 1009 1010