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_supported_version = HAMMER_VOL_VERSION_TWO; 51 int hammer_debug_io; 52 int hammer_debug_general; 53 int hammer_debug_debug = 1; /* medium-error panics */ 54 int hammer_debug_inode; 55 int hammer_debug_locks; 56 int hammer_debug_btree; 57 int hammer_debug_tid; 58 int hammer_debug_recover; /* -1 will disable, +1 will force */ 59 int hammer_debug_recover_faults; 60 int hammer_cluster_enable = 1; /* enable read clustering by default */ 61 int hammer_count_fsyncs; 62 int hammer_count_inodes; 63 int hammer_count_iqueued; 64 int hammer_count_reclaiming; 65 int hammer_count_records; 66 int hammer_count_record_datas; 67 int hammer_count_volumes; 68 int hammer_count_buffers; 69 int hammer_count_nodes; 70 int64_t hammer_count_extra_space_used; 71 int64_t hammer_stats_btree_lookups; 72 int64_t hammer_stats_btree_searches; 73 int64_t hammer_stats_btree_inserts; 74 int64_t hammer_stats_btree_deletes; 75 int64_t hammer_stats_btree_elements; 76 int64_t hammer_stats_btree_splits; 77 int64_t hammer_stats_btree_iterations; 78 int64_t hammer_stats_btree_root_iterations; 79 int64_t hammer_stats_record_iterations; 80 81 int64_t hammer_stats_file_read; 82 int64_t hammer_stats_file_write; 83 int64_t hammer_stats_file_iopsr; 84 int64_t hammer_stats_file_iopsw; 85 int64_t hammer_stats_disk_read; 86 int64_t hammer_stats_disk_write; 87 int64_t hammer_stats_inode_flushes; 88 int64_t hammer_stats_commits; 89 90 int hammer_count_dirtybufspace; /* global */ 91 int hammer_count_refedbufs; /* global */ 92 int hammer_count_reservations; 93 int hammer_count_io_running_read; 94 int hammer_count_io_running_write; 95 int hammer_count_io_locked; 96 int hammer_limit_dirtybufspace; /* per-mount */ 97 int hammer_limit_recs; /* as a whole XXX */ 98 int hammer_autoflush = 2000; /* auto flush */ 99 int hammer_bio_count; 100 int hammer_verify_zone; 101 int hammer_verify_data = 1; 102 int hammer_write_mode; 103 int64_t hammer_contention_count; 104 int64_t hammer_zone_limit; 105 106 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem"); 107 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD, 108 &hammer_supported_version, 0, ""); 109 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW, 110 &hammer_debug_general, 0, ""); 111 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW, 112 &hammer_debug_io, 0, ""); 113 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW, 114 &hammer_debug_debug, 0, ""); 115 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW, 116 &hammer_debug_inode, 0, ""); 117 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW, 118 &hammer_debug_locks, 0, ""); 119 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW, 120 &hammer_debug_btree, 0, ""); 121 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW, 122 &hammer_debug_tid, 0, ""); 123 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW, 124 &hammer_debug_recover, 0, ""); 125 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW, 126 &hammer_debug_recover_faults, 0, ""); 127 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW, 128 &hammer_cluster_enable, 0, ""); 129 130 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW, 131 &hammer_limit_dirtybufspace, 0, ""); 132 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW, 133 &hammer_limit_recs, 0, ""); 134 135 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD, 136 &hammer_count_fsyncs, 0, ""); 137 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD, 138 &hammer_count_inodes, 0, ""); 139 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD, 140 &hammer_count_iqueued, 0, ""); 141 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD, 142 &hammer_count_reclaiming, 0, ""); 143 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD, 144 &hammer_count_records, 0, ""); 145 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD, 146 &hammer_count_record_datas, 0, ""); 147 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD, 148 &hammer_count_volumes, 0, ""); 149 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD, 150 &hammer_count_buffers, 0, ""); 151 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD, 152 &hammer_count_nodes, 0, ""); 153 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD, 154 &hammer_count_extra_space_used, 0, ""); 155 156 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD, 157 &hammer_stats_btree_searches, 0, ""); 158 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD, 159 &hammer_stats_btree_lookups, 0, ""); 160 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD, 161 &hammer_stats_btree_inserts, 0, ""); 162 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD, 163 &hammer_stats_btree_deletes, 0, ""); 164 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD, 165 &hammer_stats_btree_elements, 0, ""); 166 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD, 167 &hammer_stats_btree_splits, 0, ""); 168 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD, 169 &hammer_stats_btree_iterations, 0, ""); 170 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD, 171 &hammer_stats_btree_root_iterations, 0, ""); 172 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD, 173 &hammer_stats_record_iterations, 0, ""); 174 175 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD, 176 &hammer_stats_file_read, 0, ""); 177 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD, 178 &hammer_stats_file_write, 0, ""); 179 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD, 180 &hammer_stats_file_iopsr, 0, ""); 181 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD, 182 &hammer_stats_file_iopsw, 0, ""); 183 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD, 184 &hammer_stats_disk_read, 0, ""); 185 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD, 186 &hammer_stats_disk_write, 0, ""); 187 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD, 188 &hammer_stats_inode_flushes, 0, ""); 189 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD, 190 &hammer_stats_commits, 0, ""); 191 192 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD, 193 &hammer_count_dirtybufspace, 0, ""); 194 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD, 195 &hammer_count_refedbufs, 0, ""); 196 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD, 197 &hammer_count_reservations, 0, ""); 198 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD, 199 &hammer_count_io_running_read, 0, ""); 200 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD, 201 &hammer_count_io_locked, 0, ""); 202 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD, 203 &hammer_count_io_running_write, 0, ""); 204 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW, 205 &hammer_zone_limit, 0, ""); 206 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW, 207 &hammer_contention_count, 0, ""); 208 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW, 209 &hammer_autoflush, 0, ""); 210 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW, 211 &hammer_verify_zone, 0, ""); 212 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW, 213 &hammer_verify_data, 0, ""); 214 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW, 215 &hammer_write_mode, 0, ""); 216 217 KTR_INFO_MASTER(hammer); 218 219 /* 220 * VFS ABI 221 */ 222 static void hammer_free_hmp(struct mount *mp); 223 224 static int hammer_vfs_mount(struct mount *mp, char *path, caddr_t data, 225 struct ucred *cred); 226 static int hammer_vfs_unmount(struct mount *mp, int mntflags); 227 static int hammer_vfs_root(struct mount *mp, struct vnode **vpp); 228 static int hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, 229 struct ucred *cred); 230 static int hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, 231 struct ucred *cred); 232 static int hammer_vfs_sync(struct mount *mp, int waitfor); 233 static int hammer_vfs_vget(struct mount *mp, ino_t ino, 234 struct vnode **vpp); 235 static int hammer_vfs_init(struct vfsconf *conf); 236 static int hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 237 struct fid *fhp, struct vnode **vpp); 238 static int hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp); 239 static int hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 240 int *exflagsp, struct ucred **credanonp); 241 242 243 static struct vfsops hammer_vfsops = { 244 .vfs_mount = hammer_vfs_mount, 245 .vfs_unmount = hammer_vfs_unmount, 246 .vfs_root = hammer_vfs_root, 247 .vfs_statfs = hammer_vfs_statfs, 248 .vfs_statvfs = hammer_vfs_statvfs, 249 .vfs_sync = hammer_vfs_sync, 250 .vfs_vget = hammer_vfs_vget, 251 .vfs_init = hammer_vfs_init, 252 .vfs_vptofh = hammer_vfs_vptofh, 253 .vfs_fhtovp = hammer_vfs_fhtovp, 254 .vfs_checkexp = hammer_vfs_checkexp 255 }; 256 257 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", ""); 258 259 VFS_SET(hammer_vfsops, hammer, 0); 260 MODULE_VERSION(hammer, 1); 261 262 static int 263 hammer_vfs_init(struct vfsconf *conf) 264 { 265 int n; 266 267 if (hammer_limit_recs == 0) { 268 hammer_limit_recs = nbuf * 25; 269 n = kmalloc_limit(M_HAMMER) / 512; 270 if (hammer_limit_recs > n) 271 hammer_limit_recs = n; 272 } 273 if (hammer_limit_dirtybufspace == 0) { 274 hammer_limit_dirtybufspace = hidirtybufspace / 2; 275 if (hammer_limit_dirtybufspace < 100) 276 hammer_limit_dirtybufspace = 100; 277 } 278 return(0); 279 } 280 281 static int 282 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data, 283 struct ucred *cred) 284 { 285 struct hammer_mount_info info; 286 hammer_mount_t hmp; 287 hammer_volume_t rootvol; 288 struct vnode *rootvp; 289 struct vnode *devvp = NULL; 290 const char *upath; /* volume name in userspace */ 291 char *path; /* volume name in system space */ 292 int error; 293 int i; 294 int master_id; 295 int maxinodes; 296 297 /* 298 * Accept hammer_mount_info. mntpt is NULL for root mounts at boot. 299 */ 300 if (mntpt == NULL) { 301 if ((error = bdevvp(rootdev, &devvp))) { 302 kprintf("hammer_mountroot: can't find devvp\n"); 303 return (error); 304 } 305 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */ 306 bzero(&info, sizeof(info)); 307 info.asof = 0; 308 info.hflags = 0; 309 info.nvolumes = 1; 310 } else { 311 if ((error = copyin(data, &info, sizeof(info))) != 0) 312 return (error); 313 } 314 315 /* 316 * updating or new mount 317 */ 318 if (mp->mnt_flag & MNT_UPDATE) { 319 hmp = (void *)mp->mnt_data; 320 KKASSERT(hmp != NULL); 321 } else { 322 if (info.nvolumes <= 0 || info.nvolumes >= 32768) 323 return (EINVAL); 324 hmp = NULL; 325 } 326 327 /* 328 * master-id validation. The master id may not be changed by a 329 * mount update. 330 */ 331 if (info.hflags & HMNT_MASTERID) { 332 if (hmp && hmp->master_id != info.master_id) { 333 kprintf("hammer: cannot change master id " 334 "with mount update\n"); 335 return(EINVAL); 336 } 337 master_id = info.master_id; 338 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS) 339 return (EINVAL); 340 } else { 341 if (hmp) 342 master_id = hmp->master_id; 343 else 344 master_id = 0; 345 } 346 347 /* 348 * Interal mount data structure 349 */ 350 if (hmp == NULL) { 351 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO); 352 mp->mnt_data = (qaddr_t)hmp; 353 hmp->mp = mp; 354 /*TAILQ_INIT(&hmp->recycle_list);*/ 355 356 /* 357 * Make sure kmalloc type limits are set appropriately. If root 358 * increases the vnode limit you may have to do a dummy remount 359 * to adjust the HAMMER inode limit. 360 */ 361 kmalloc_create(&hmp->m_misc, "HAMMER-others"); 362 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes"); 363 364 maxinodes = desiredvnodes + desiredvnodes / 5 + 365 HAMMER_RECLAIM_WAIT; 366 kmalloc_raise_limit(hmp->m_inodes, 367 maxinodes * sizeof(struct hammer_inode)); 368 369 hmp->root_btree_beg.localization = 0x00000000U; 370 hmp->root_btree_beg.obj_id = -0x8000000000000000LL; 371 hmp->root_btree_beg.key = -0x8000000000000000LL; 372 hmp->root_btree_beg.create_tid = 1; 373 hmp->root_btree_beg.delete_tid = 1; 374 hmp->root_btree_beg.rec_type = 0; 375 hmp->root_btree_beg.obj_type = 0; 376 377 hmp->root_btree_end.localization = 0xFFFFFFFFU; 378 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL; 379 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL; 380 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL; 381 hmp->root_btree_end.delete_tid = 0; /* special case */ 382 hmp->root_btree_end.rec_type = 0xFFFFU; 383 hmp->root_btree_end.obj_type = 0; 384 385 hmp->krate.freq = 1; /* maximum reporting rate (hz) */ 386 hmp->krate.count = -16; /* initial burst */ 387 388 hmp->sync_lock.refs = 1; 389 hmp->free_lock.refs = 1; 390 hmp->undo_lock.refs = 1; 391 hmp->blkmap_lock.refs = 1; 392 393 TAILQ_INIT(&hmp->delay_list); 394 TAILQ_INIT(&hmp->flush_group_list); 395 TAILQ_INIT(&hmp->objid_cache_list); 396 TAILQ_INIT(&hmp->undo_lru_list); 397 TAILQ_INIT(&hmp->reclaim_list); 398 } 399 hmp->hflags &= ~HMNT_USERFLAGS; 400 hmp->hflags |= info.hflags & HMNT_USERFLAGS; 401 402 hmp->master_id = master_id; 403 404 if (info.asof) { 405 mp->mnt_flag |= MNT_RDONLY; 406 hmp->asof = info.asof; 407 } else { 408 hmp->asof = HAMMER_MAX_TID; 409 } 410 411 /* 412 * Re-open read-write if originally read-only, or vise-versa. 413 */ 414 if (mp->mnt_flag & MNT_UPDATE) { 415 error = 0; 416 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 417 kprintf("HAMMER read-only -> read-write\n"); 418 hmp->ronly = 0; 419 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 420 hammer_adjust_volume_mode, NULL); 421 rootvol = hammer_get_root_volume(hmp, &error); 422 if (rootvol) { 423 hammer_recover_flush_buffers(hmp, rootvol, 1); 424 bcopy(rootvol->ondisk->vol0_blockmap, 425 hmp->blockmap, 426 sizeof(hmp->blockmap)); 427 hammer_rel_volume(rootvol, 0); 428 } 429 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 430 hammer_reload_inode, NULL); 431 /* kernel clears MNT_RDONLY */ 432 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 433 kprintf("HAMMER read-write -> read-only\n"); 434 hmp->ronly = 1; /* messy */ 435 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 436 hammer_reload_inode, NULL); 437 hmp->ronly = 0; 438 hammer_flusher_sync(hmp); 439 hammer_flusher_sync(hmp); 440 hammer_flusher_sync(hmp); 441 hmp->ronly = 1; 442 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 443 hammer_adjust_volume_mode, NULL); 444 } 445 return(error); 446 } 447 448 RB_INIT(&hmp->rb_vols_root); 449 RB_INIT(&hmp->rb_inos_root); 450 RB_INIT(&hmp->rb_nods_root); 451 RB_INIT(&hmp->rb_undo_root); 452 RB_INIT(&hmp->rb_resv_root); 453 RB_INIT(&hmp->rb_bufs_root); 454 RB_INIT(&hmp->rb_pfsm_root); 455 456 hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); 457 458 TAILQ_INIT(&hmp->volu_list); 459 TAILQ_INIT(&hmp->undo_list); 460 TAILQ_INIT(&hmp->data_list); 461 TAILQ_INIT(&hmp->meta_list); 462 TAILQ_INIT(&hmp->lose_list); 463 464 /* 465 * Load volumes 466 */ 467 path = objcache_get(namei_oc, M_WAITOK); 468 hmp->nvolumes = -1; 469 for (i = 0; i < info.nvolumes; ++i) { 470 if (mntpt == NULL) { 471 /* 472 * Root mount. 473 * Only one volume; and no need for copyin. 474 */ 475 KKASSERT(info.nvolumes == 1); 476 ksnprintf(path, MAXPATHLEN, "/dev/%s", 477 mp->mnt_stat.f_mntfromname); 478 error = 0; 479 } else { 480 error = copyin(&info.volumes[i], &upath, 481 sizeof(char *)); 482 if (error == 0) 483 error = copyinstr(upath, path, 484 MAXPATHLEN, NULL); 485 } 486 if (error == 0) 487 error = hammer_install_volume(hmp, path, devvp); 488 if (error) 489 break; 490 } 491 objcache_put(namei_oc, path); 492 493 /* 494 * Make sure we found a root volume 495 */ 496 if (error == 0 && hmp->rootvol == NULL) { 497 kprintf("hammer_mount: No root volume found!\n"); 498 error = EINVAL; 499 } 500 501 /* 502 * Check that all required volumes are available 503 */ 504 if (error == 0 && hammer_mountcheck_volumes(hmp)) { 505 kprintf("hammer_mount: Missing volumes, cannot mount!\n"); 506 error = EINVAL; 507 } 508 509 if (error) { 510 hammer_free_hmp(mp); 511 return (error); 512 } 513 514 /* 515 * No errors, setup enough of the mount point so we can lookup the 516 * root vnode. 517 */ 518 mp->mnt_iosize_max = MAXPHYS; 519 mp->mnt_kern_flag |= MNTK_FSMID; 520 521 /* 522 * note: f_iosize is used by vnode_pager_haspage() when constructing 523 * its VOP_BMAP call. 524 */ 525 mp->mnt_stat.f_iosize = HAMMER_BUFSIZE; 526 mp->mnt_stat.f_bsize = HAMMER_BUFSIZE; 527 528 mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE; 529 mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE; 530 531 mp->mnt_maxsymlinklen = 255; 532 mp->mnt_flag |= MNT_LOCAL; 533 534 vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops); 535 vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops); 536 vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops); 537 538 /* 539 * The root volume's ondisk pointer is only valid if we hold a 540 * reference to it. 541 */ 542 rootvol = hammer_get_root_volume(hmp, &error); 543 if (error) 544 goto failed; 545 546 /* 547 * Perform any necessary UNDO operations. The recovery code does 548 * call hammer_undo_lookup() so we have to pre-cache the blockmap, 549 * and then re-copy it again after recovery is complete. 550 * 551 * If this is a read-only mount the UNDO information is retained 552 * in memory in the form of dirty buffer cache buffers, and not 553 * written back to the media. 554 */ 555 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, 556 sizeof(hmp->blockmap)); 557 558 /* 559 * Check filesystem version 560 */ 561 hmp->version = rootvol->ondisk->vol_version; 562 if (hmp->version < HAMMER_VOL_VERSION_MIN || 563 hmp->version > HAMMER_VOL_VERSION_MAX) { 564 kprintf("HAMMER: mount unsupported fs version %d\n", 565 hmp->version); 566 error = ERANGE; 567 goto done; 568 } 569 570 /* 571 * The undo_rec_limit limits the size of flush groups to avoid 572 * blowing out the UNDO FIFO. This calculation is typically in 573 * the tens of thousands and is designed primarily when small 574 * HAMMER filesystems are created. 575 */ 576 hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100; 577 if (hammer_debug_general & 0x0001) 578 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit); 579 580 error = hammer_recover(hmp, rootvol); 581 if (error) { 582 kprintf("Failed to recover HAMMER filesystem on mount\n"); 583 goto done; 584 } 585 586 /* 587 * Finish setup now that we have a good root volume. 588 * 589 * The top 16 bits of fsid.val[1] is a pfs id. 590 */ 591 ksnprintf(mp->mnt_stat.f_mntfromname, 592 sizeof(mp->mnt_stat.f_mntfromname), "%s", 593 rootvol->ondisk->vol_name); 594 mp->mnt_stat.f_fsid.val[0] = 595 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8); 596 mp->mnt_stat.f_fsid.val[1] = 597 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8); 598 mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF; 599 600 mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid; 601 mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid, 602 sizeof(mp->mnt_vstat.f_fsid_uuid)); 603 604 /* 605 * Certain often-modified fields in the root volume are cached in 606 * the hammer_mount structure so we do not have to generate lots 607 * of little UNDO structures for them. 608 * 609 * Recopy after recovery. This also has the side effect of 610 * setting our cached undo FIFO's first_offset, which serves to 611 * placemark the FIFO start for the NEXT flush cycle while the 612 * on-disk first_offset represents the LAST flush cycle. 613 */ 614 hmp->next_tid = rootvol->ondisk->vol0_next_tid; 615 hmp->flush_tid1 = hmp->next_tid; 616 hmp->flush_tid2 = hmp->next_tid; 617 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, 618 sizeof(hmp->blockmap)); 619 hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks; 620 621 hammer_flusher_create(hmp); 622 623 /* 624 * Locate the root directory using the root cluster's B-Tree as a 625 * starting point. The root directory uses an obj_id of 1. 626 * 627 * FUTURE: Leave the root directory cached referenced but unlocked 628 * in hmp->rootvp (need to flush it on unmount). 629 */ 630 error = hammer_vfs_vget(mp, 1, &rootvp); 631 if (error) 632 goto done; 633 vput(rootvp); 634 /*vn_unlock(hmp->rootvp);*/ 635 636 done: 637 hammer_rel_volume(rootvol, 0); 638 failed: 639 /* 640 * Cleanup and return. 641 */ 642 if (error) 643 hammer_free_hmp(mp); 644 return (error); 645 } 646 647 static int 648 hammer_vfs_unmount(struct mount *mp, int mntflags) 649 { 650 #if 0 651 struct hammer_mount *hmp = (void *)mp->mnt_data; 652 #endif 653 int flags; 654 int error; 655 656 /* 657 * Clean out the vnodes 658 */ 659 flags = 0; 660 if (mntflags & MNT_FORCE) 661 flags |= FORCECLOSE; 662 if ((error = vflush(mp, 0, flags)) != 0) 663 return (error); 664 665 /* 666 * Clean up the internal mount structure and related entities. This 667 * may issue I/O. 668 */ 669 hammer_free_hmp(mp); 670 return(0); 671 } 672 673 /* 674 * Clean up the internal mount structure and disassociate it from the mount. 675 * This may issue I/O. 676 */ 677 static void 678 hammer_free_hmp(struct mount *mp) 679 { 680 struct hammer_mount *hmp = (void *)mp->mnt_data; 681 hammer_flush_group_t flg; 682 int count; 683 int dummy; 684 685 /* 686 * Flush anything dirty. This won't even run if the 687 * filesystem errored-out. 688 */ 689 count = 0; 690 while (hammer_flusher_haswork(hmp)) { 691 hammer_flusher_sync(hmp); 692 ++count; 693 if (count >= 5) { 694 if (count == 5) 695 kprintf("HAMMER: umount flushing."); 696 else 697 kprintf("."); 698 tsleep(&dummy, 0, "hmrufl", hz); 699 } 700 if (count == 30) { 701 kprintf("giving up\n"); 702 break; 703 } 704 } 705 if (count >= 5 && count < 30) 706 kprintf("\n"); 707 708 /* 709 * If the mount had a critical error we have to destroy any 710 * remaining inodes before we can finish cleaning up the flusher. 711 */ 712 if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) { 713 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 714 hammer_destroy_inode_callback, NULL); 715 } 716 717 /* 718 * There shouldn't be any inodes left now and any left over 719 * flush groups should now be empty. 720 */ 721 KKASSERT(RB_EMPTY(&hmp->rb_inos_root)); 722 while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) { 723 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry); 724 KKASSERT(TAILQ_EMPTY(&flg->flush_list)); 725 if (flg->refs) { 726 kprintf("HAMMER: Warning, flush_group %p was " 727 "not empty on umount!\n", flg); 728 } 729 kfree(flg, hmp->m_misc); 730 } 731 732 /* 733 * We can finally destroy the flusher 734 */ 735 hammer_flusher_destroy(hmp); 736 737 /* 738 * We may have held recovered buffers due to a read-only mount. 739 * These must be discarded. 740 */ 741 if (hmp->ronly) 742 hammer_recover_flush_buffers(hmp, NULL, -1); 743 744 /* 745 * Unload buffers and then volumes 746 */ 747 RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL, 748 hammer_unload_buffer, NULL); 749 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 750 hammer_unload_volume, NULL); 751 752 mp->mnt_data = NULL; 753 mp->mnt_flag &= ~MNT_LOCAL; 754 hmp->mp = NULL; 755 hammer_destroy_objid_cache(hmp); 756 kmalloc_destroy(&hmp->m_misc); 757 kmalloc_destroy(&hmp->m_inodes); 758 kfree(hmp, M_HAMMER); 759 } 760 761 /* 762 * Report critical errors. ip may be NULL. 763 */ 764 void 765 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip, 766 int error, const char *msg) 767 { 768 hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR; 769 krateprintf(&hmp->krate, 770 "HAMMER(%s): Critical error inode=%lld %s\n", 771 hmp->mp->mnt_stat.f_mntfromname, 772 (long long)(ip ? ip->obj_id : -1), msg); 773 if (hmp->ronly == 0) { 774 hmp->ronly = 2; /* special errored read-only mode */ 775 hmp->mp->mnt_flag |= MNT_RDONLY; 776 kprintf("HAMMER(%s): Forcing read-only mode\n", 777 hmp->mp->mnt_stat.f_mntfromname); 778 } 779 hmp->error = error; 780 } 781 782 783 /* 784 * Obtain a vnode for the specified inode number. An exclusively locked 785 * vnode is returned. 786 */ 787 int 788 hammer_vfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 789 { 790 struct hammer_transaction trans; 791 struct hammer_mount *hmp = (void *)mp->mnt_data; 792 struct hammer_inode *ip; 793 int error; 794 795 hammer_simple_transaction(&trans, hmp); 796 797 /* 798 * Lookup the requested HAMMER inode. The structure must be 799 * left unlocked while we manipulate the related vnode to avoid 800 * a deadlock. 801 */ 802 ip = hammer_get_inode(&trans, NULL, ino, 803 hmp->asof, HAMMER_DEF_LOCALIZATION, 804 0, &error); 805 if (ip == NULL) { 806 *vpp = NULL; 807 hammer_done_transaction(&trans); 808 return(error); 809 } 810 error = hammer_get_vnode(ip, vpp); 811 hammer_rel_inode(ip, 0); 812 hammer_done_transaction(&trans); 813 return (error); 814 } 815 816 /* 817 * Return the root vnode for the filesystem. 818 * 819 * HAMMER stores the root vnode in the hammer_mount structure so 820 * getting it is easy. 821 */ 822 static int 823 hammer_vfs_root(struct mount *mp, struct vnode **vpp) 824 { 825 #if 0 826 struct hammer_mount *hmp = (void *)mp->mnt_data; 827 #endif 828 int error; 829 830 error = hammer_vfs_vget(mp, 1, vpp); 831 return (error); 832 } 833 834 static int 835 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 836 { 837 struct hammer_mount *hmp = (void *)mp->mnt_data; 838 hammer_volume_t volume; 839 hammer_volume_ondisk_t ondisk; 840 int error; 841 int64_t bfree; 842 int64_t breserved; 843 844 volume = hammer_get_root_volume(hmp, &error); 845 if (error) 846 return(error); 847 ondisk = volume->ondisk; 848 849 /* 850 * Basic stats 851 */ 852 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved); 853 mp->mnt_stat.f_files = ondisk->vol0_stat_inodes; 854 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE; 855 hammer_rel_volume(volume, 0); 856 857 mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE; 858 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree; 859 if (mp->mnt_stat.f_files < 0) 860 mp->mnt_stat.f_files = 0; 861 862 *sbp = mp->mnt_stat; 863 return(0); 864 } 865 866 static int 867 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 868 { 869 struct hammer_mount *hmp = (void *)mp->mnt_data; 870 hammer_volume_t volume; 871 hammer_volume_ondisk_t ondisk; 872 int error; 873 int64_t bfree; 874 int64_t breserved; 875 876 volume = hammer_get_root_volume(hmp, &error); 877 if (error) 878 return(error); 879 ondisk = volume->ondisk; 880 881 /* 882 * Basic stats 883 */ 884 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved); 885 mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes; 886 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE; 887 hammer_rel_volume(volume, 0); 888 889 mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE; 890 mp->mnt_vstat.f_bavail = mp->mnt_stat.f_bfree; 891 if (mp->mnt_vstat.f_files < 0) 892 mp->mnt_vstat.f_files = 0; 893 *sbp = mp->mnt_vstat; 894 return(0); 895 } 896 897 /* 898 * Sync the filesystem. Currently we have to run it twice, the second 899 * one will advance the undo start index to the end index, so if a crash 900 * occurs no undos will be run on mount. 901 * 902 * We do not sync the filesystem if we are called from a panic. If we did 903 * we might end up blowing up a sync that was already in progress. 904 */ 905 static int 906 hammer_vfs_sync(struct mount *mp, int waitfor) 907 { 908 struct hammer_mount *hmp = (void *)mp->mnt_data; 909 int error; 910 911 if (panicstr == NULL) { 912 error = hammer_sync_hmp(hmp, waitfor); 913 } else { 914 error = EIO; 915 } 916 return (error); 917 } 918 919 /* 920 * Convert a vnode to a file handle. 921 */ 922 static int 923 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp) 924 { 925 hammer_inode_t ip; 926 927 KKASSERT(MAXFIDSZ >= 16); 928 ip = VTOI(vp); 929 fhp->fid_len = offsetof(struct fid, fid_data[16]); 930 fhp->fid_ext = ip->obj_localization >> 16; 931 bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id)); 932 bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof)); 933 return(0); 934 } 935 936 937 /* 938 * Convert a file handle back to a vnode. 939 * 940 * Use rootvp to enforce PFS isolation when a PFS is exported via a 941 * null mount. 942 */ 943 static int 944 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 945 struct fid *fhp, struct vnode **vpp) 946 { 947 struct hammer_transaction trans; 948 struct hammer_inode *ip; 949 struct hammer_inode_info info; 950 int error; 951 u_int32_t localization; 952 953 bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id)); 954 bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof)); 955 if (rootvp) 956 localization = VTOI(rootvp)->obj_localization; 957 else 958 localization = (u_int32_t)fhp->fid_ext << 16; 959 960 hammer_simple_transaction(&trans, (void *)mp->mnt_data); 961 962 /* 963 * Get/allocate the hammer_inode structure. The structure must be 964 * unlocked while we manipulate the related vnode to avoid a 965 * deadlock. 966 */ 967 ip = hammer_get_inode(&trans, NULL, info.obj_id, 968 info.obj_asof, localization, 0, &error); 969 if (ip == NULL) { 970 *vpp = NULL; 971 return(error); 972 } 973 error = hammer_get_vnode(ip, vpp); 974 hammer_rel_inode(ip, 0); 975 hammer_done_transaction(&trans); 976 return (error); 977 } 978 979 static int 980 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 981 int *exflagsp, struct ucred **credanonp) 982 { 983 hammer_mount_t hmp = (void *)mp->mnt_data; 984 struct netcred *np; 985 int error; 986 987 np = vfs_export_lookup(mp, &hmp->export, nam); 988 if (np) { 989 *exflagsp = np->netc_exflags; 990 *credanonp = &np->netc_anon; 991 error = 0; 992 } else { 993 error = EACCES; 994 } 995 return (error); 996 997 } 998 999 int 1000 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export) 1001 { 1002 hammer_mount_t hmp = (void *)mp->mnt_data; 1003 int error; 1004 1005 switch(op) { 1006 case MOUNTCTL_SET_EXPORT: 1007 error = vfs_export(mp, &hmp->export, export); 1008 break; 1009 default: 1010 error = EOPNOTSUPP; 1011 break; 1012 } 1013 return(error); 1014 } 1015 1016