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_DEFAULT; 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_debug_critical; /* non-zero enter debugger on error */ 61 int hammer_cluster_enable = 1; /* enable read clustering by default */ 62 int hammer_count_fsyncs; 63 int hammer_count_inodes; 64 int hammer_count_iqueued; 65 int hammer_count_reclaiming; 66 int hammer_count_records; 67 int hammer_count_record_datas; 68 int hammer_count_volumes; 69 int hammer_count_buffers; 70 int hammer_count_nodes; 71 int64_t hammer_count_extra_space_used; 72 int64_t hammer_stats_btree_lookups; 73 int64_t hammer_stats_btree_searches; 74 int64_t hammer_stats_btree_inserts; 75 int64_t hammer_stats_btree_deletes; 76 int64_t hammer_stats_btree_elements; 77 int64_t hammer_stats_btree_splits; 78 int64_t hammer_stats_btree_iterations; 79 int64_t hammer_stats_btree_root_iterations; 80 int64_t hammer_stats_record_iterations; 81 82 int64_t hammer_stats_file_read; 83 int64_t hammer_stats_file_write; 84 int64_t hammer_stats_file_iopsr; 85 int64_t hammer_stats_file_iopsw; 86 int64_t hammer_stats_disk_read; 87 int64_t hammer_stats_disk_write; 88 int64_t hammer_stats_inode_flushes; 89 int64_t hammer_stats_commits; 90 int64_t hammer_stats_undo; 91 92 int hammer_count_dirtybufspace; /* global */ 93 int hammer_count_refedbufs; /* global */ 94 int hammer_count_reservations; 95 int hammer_count_io_running_read; 96 int hammer_count_io_running_write; 97 int hammer_count_io_locked; 98 int hammer_limit_dirtybufspace; /* per-mount */ 99 int hammer_limit_recs; /* as a whole XXX */ 100 int hammer_limit_inode_recs = 1024; /* per inode */ 101 int hammer_limit_reclaim = HAMMER_RECLAIM_WAIT; 102 int hammer_autoflush = 2000; /* auto flush */ 103 int hammer_bio_count; 104 int hammer_verify_zone; 105 int hammer_verify_data = 1; 106 int hammer_write_mode; 107 int hammer_yield_check = 16; 108 int hammer_fsync_mode; 109 int64_t hammer_contention_count; 110 int64_t hammer_zone_limit; 111 112 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem"); 113 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD, 114 &hammer_supported_version, 0, ""); 115 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW, 116 &hammer_debug_general, 0, ""); 117 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW, 118 &hammer_debug_io, 0, ""); 119 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW, 120 &hammer_debug_debug, 0, ""); 121 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW, 122 &hammer_debug_inode, 0, ""); 123 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW, 124 &hammer_debug_locks, 0, ""); 125 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW, 126 &hammer_debug_btree, 0, ""); 127 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW, 128 &hammer_debug_tid, 0, ""); 129 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW, 130 &hammer_debug_recover, 0, ""); 131 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW, 132 &hammer_debug_recover_faults, 0, ""); 133 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW, 134 &hammer_debug_critical, 0, ""); 135 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW, 136 &hammer_cluster_enable, 0, ""); 137 138 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW, 139 &hammer_limit_dirtybufspace, 0, ""); 140 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW, 141 &hammer_limit_recs, 0, ""); 142 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW, 143 &hammer_limit_inode_recs, 0, ""); 144 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaim, CTLFLAG_RW, 145 &hammer_limit_reclaim, 0, ""); 146 147 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD, 148 &hammer_count_fsyncs, 0, ""); 149 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD, 150 &hammer_count_inodes, 0, ""); 151 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD, 152 &hammer_count_iqueued, 0, ""); 153 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD, 154 &hammer_count_reclaiming, 0, ""); 155 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD, 156 &hammer_count_records, 0, ""); 157 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD, 158 &hammer_count_record_datas, 0, ""); 159 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD, 160 &hammer_count_volumes, 0, ""); 161 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD, 162 &hammer_count_buffers, 0, ""); 163 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD, 164 &hammer_count_nodes, 0, ""); 165 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD, 166 &hammer_count_extra_space_used, 0, ""); 167 168 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD, 169 &hammer_stats_btree_searches, 0, ""); 170 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD, 171 &hammer_stats_btree_lookups, 0, ""); 172 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD, 173 &hammer_stats_btree_inserts, 0, ""); 174 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD, 175 &hammer_stats_btree_deletes, 0, ""); 176 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD, 177 &hammer_stats_btree_elements, 0, ""); 178 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD, 179 &hammer_stats_btree_splits, 0, ""); 180 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD, 181 &hammer_stats_btree_iterations, 0, ""); 182 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD, 183 &hammer_stats_btree_root_iterations, 0, ""); 184 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD, 185 &hammer_stats_record_iterations, 0, ""); 186 187 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD, 188 &hammer_stats_file_read, 0, ""); 189 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD, 190 &hammer_stats_file_write, 0, ""); 191 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD, 192 &hammer_stats_file_iopsr, 0, ""); 193 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD, 194 &hammer_stats_file_iopsw, 0, ""); 195 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD, 196 &hammer_stats_disk_read, 0, ""); 197 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD, 198 &hammer_stats_disk_write, 0, ""); 199 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD, 200 &hammer_stats_inode_flushes, 0, ""); 201 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD, 202 &hammer_stats_commits, 0, ""); 203 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD, 204 &hammer_stats_undo, 0, ""); 205 206 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD, 207 &hammer_count_dirtybufspace, 0, ""); 208 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD, 209 &hammer_count_refedbufs, 0, ""); 210 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD, 211 &hammer_count_reservations, 0, ""); 212 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD, 213 &hammer_count_io_running_read, 0, ""); 214 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD, 215 &hammer_count_io_locked, 0, ""); 216 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD, 217 &hammer_count_io_running_write, 0, ""); 218 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW, 219 &hammer_zone_limit, 0, ""); 220 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW, 221 &hammer_contention_count, 0, ""); 222 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW, 223 &hammer_autoflush, 0, ""); 224 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW, 225 &hammer_verify_zone, 0, ""); 226 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW, 227 &hammer_verify_data, 0, ""); 228 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW, 229 &hammer_write_mode, 0, ""); 230 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW, 231 &hammer_yield_check, 0, ""); 232 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW, 233 &hammer_fsync_mode, 0, ""); 234 235 KTR_INFO_MASTER(hammer); 236 237 /* 238 * VFS ABI 239 */ 240 static void hammer_free_hmp(struct mount *mp); 241 242 static int hammer_vfs_mount(struct mount *mp, char *path, caddr_t data, 243 struct ucred *cred); 244 static int hammer_vfs_unmount(struct mount *mp, int mntflags); 245 static int hammer_vfs_root(struct mount *mp, struct vnode **vpp); 246 static int hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, 247 struct ucred *cred); 248 static int hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, 249 struct ucred *cred); 250 static int hammer_vfs_sync(struct mount *mp, int waitfor); 251 static int hammer_vfs_vget(struct mount *mp, struct vnode *dvp, 252 ino_t ino, struct vnode **vpp); 253 static int hammer_vfs_init(struct vfsconf *conf); 254 static int hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 255 struct fid *fhp, struct vnode **vpp); 256 static int hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp); 257 static int hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 258 int *exflagsp, struct ucred **credanonp); 259 260 261 static struct vfsops hammer_vfsops = { 262 .vfs_mount = hammer_vfs_mount, 263 .vfs_unmount = hammer_vfs_unmount, 264 .vfs_root = hammer_vfs_root, 265 .vfs_statfs = hammer_vfs_statfs, 266 .vfs_statvfs = hammer_vfs_statvfs, 267 .vfs_sync = hammer_vfs_sync, 268 .vfs_vget = hammer_vfs_vget, 269 .vfs_init = hammer_vfs_init, 270 .vfs_vptofh = hammer_vfs_vptofh, 271 .vfs_fhtovp = hammer_vfs_fhtovp, 272 .vfs_checkexp = hammer_vfs_checkexp 273 }; 274 275 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", ""); 276 277 VFS_SET(hammer_vfsops, hammer, 0); 278 MODULE_VERSION(hammer, 1); 279 280 static int 281 hammer_vfs_init(struct vfsconf *conf) 282 { 283 int n; 284 285 if (hammer_limit_recs == 0) { 286 hammer_limit_recs = nbuf * 25; 287 n = kmalloc_limit(M_HAMMER) / 512; 288 if (hammer_limit_recs > n) 289 hammer_limit_recs = n; 290 } 291 if (hammer_limit_dirtybufspace == 0) { 292 hammer_limit_dirtybufspace = hidirtybufspace / 2; 293 if (hammer_limit_dirtybufspace < 100) 294 hammer_limit_dirtybufspace = 100; 295 } 296 return(0); 297 } 298 299 static int 300 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data, 301 struct ucred *cred) 302 { 303 struct hammer_mount_info info; 304 hammer_mount_t hmp; 305 hammer_volume_t rootvol; 306 struct vnode *rootvp; 307 struct vnode *devvp = NULL; 308 const char *upath; /* volume name in userspace */ 309 char *path; /* volume name in system space */ 310 int error; 311 int i; 312 int master_id; 313 int maxinodes; 314 315 /* 316 * Accept hammer_mount_info. mntpt is NULL for root mounts at boot. 317 */ 318 if (mntpt == NULL) { 319 if ((error = bdevvp(rootdev, &devvp))) { 320 kprintf("hammer_mountroot: can't find devvp\n"); 321 return (error); 322 } 323 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */ 324 bzero(&info, sizeof(info)); 325 info.asof = 0; 326 info.hflags = 0; 327 info.nvolumes = 1; 328 } else { 329 if ((error = copyin(data, &info, sizeof(info))) != 0) 330 return (error); 331 } 332 333 /* 334 * updating or new mount 335 */ 336 if (mp->mnt_flag & MNT_UPDATE) { 337 hmp = (void *)mp->mnt_data; 338 KKASSERT(hmp != NULL); 339 } else { 340 if (info.nvolumes <= 0 || info.nvolumes >= 32768) 341 return (EINVAL); 342 hmp = NULL; 343 } 344 345 /* 346 * master-id validation. The master id may not be changed by a 347 * mount update. 348 */ 349 if (info.hflags & HMNT_MASTERID) { 350 if (hmp && hmp->master_id != info.master_id) { 351 kprintf("hammer: cannot change master id " 352 "with mount update\n"); 353 return(EINVAL); 354 } 355 master_id = info.master_id; 356 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS) 357 return (EINVAL); 358 } else { 359 if (hmp) 360 master_id = hmp->master_id; 361 else 362 master_id = 0; 363 } 364 365 /* 366 * Interal mount data structure 367 */ 368 if (hmp == NULL) { 369 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO); 370 mp->mnt_data = (qaddr_t)hmp; 371 hmp->mp = mp; 372 /*TAILQ_INIT(&hmp->recycle_list);*/ 373 374 /* 375 * Make sure kmalloc type limits are set appropriately. If root 376 * increases the vnode limit you may have to do a dummy remount 377 * to adjust the HAMMER inode limit. 378 */ 379 kmalloc_create(&hmp->m_misc, "HAMMER-others"); 380 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes"); 381 382 maxinodes = desiredvnodes + desiredvnodes / 5 + 383 hammer_limit_reclaim * 2; 384 kmalloc_raise_limit(hmp->m_inodes, 385 maxinodes * sizeof(struct hammer_inode)); 386 387 hmp->root_btree_beg.localization = 0x00000000U; 388 hmp->root_btree_beg.obj_id = -0x8000000000000000LL; 389 hmp->root_btree_beg.key = -0x8000000000000000LL; 390 hmp->root_btree_beg.create_tid = 1; 391 hmp->root_btree_beg.delete_tid = 1; 392 hmp->root_btree_beg.rec_type = 0; 393 hmp->root_btree_beg.obj_type = 0; 394 395 hmp->root_btree_end.localization = 0xFFFFFFFFU; 396 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL; 397 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL; 398 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL; 399 hmp->root_btree_end.delete_tid = 0; /* special case */ 400 hmp->root_btree_end.rec_type = 0xFFFFU; 401 hmp->root_btree_end.obj_type = 0; 402 403 hmp->krate.freq = 1; /* maximum reporting rate (hz) */ 404 hmp->krate.count = -16; /* initial burst */ 405 406 hmp->sync_lock.refs = 1; 407 hmp->free_lock.refs = 1; 408 hmp->undo_lock.refs = 1; 409 hmp->blkmap_lock.refs = 1; 410 hmp->snapshot_lock.refs = 1; 411 412 TAILQ_INIT(&hmp->delay_list); 413 TAILQ_INIT(&hmp->flush_group_list); 414 TAILQ_INIT(&hmp->objid_cache_list); 415 TAILQ_INIT(&hmp->undo_lru_list); 416 TAILQ_INIT(&hmp->reclaim_list); 417 } 418 hmp->hflags &= ~HMNT_USERFLAGS; 419 hmp->hflags |= info.hflags & HMNT_USERFLAGS; 420 421 hmp->master_id = master_id; 422 423 if (info.asof) { 424 mp->mnt_flag |= MNT_RDONLY; 425 hmp->asof = info.asof; 426 } else { 427 hmp->asof = HAMMER_MAX_TID; 428 } 429 430 /* 431 * Re-open read-write if originally read-only, or vise-versa. 432 * 433 * When going from read-only to read-write execute the stage2 434 * recovery if it has not already been run. 435 */ 436 if (mp->mnt_flag & MNT_UPDATE) { 437 error = 0; 438 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 439 kprintf("HAMMER read-only -> read-write\n"); 440 hmp->ronly = 0; 441 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 442 hammer_adjust_volume_mode, NULL); 443 rootvol = hammer_get_root_volume(hmp, &error); 444 if (rootvol) { 445 hammer_recover_flush_buffers(hmp, rootvol, 1); 446 error = hammer_recover_stage2(hmp, rootvol); 447 bcopy(rootvol->ondisk->vol0_blockmap, 448 hmp->blockmap, 449 sizeof(hmp->blockmap)); 450 hammer_rel_volume(rootvol, 0); 451 } 452 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 453 hammer_reload_inode, NULL); 454 /* kernel clears MNT_RDONLY */ 455 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 456 kprintf("HAMMER read-write -> read-only\n"); 457 hmp->ronly = 1; /* messy */ 458 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 459 hammer_reload_inode, NULL); 460 hmp->ronly = 0; 461 hammer_flusher_sync(hmp); 462 hammer_flusher_sync(hmp); 463 hammer_flusher_sync(hmp); 464 hmp->ronly = 1; 465 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 466 hammer_adjust_volume_mode, NULL); 467 } 468 return(error); 469 } 470 471 RB_INIT(&hmp->rb_vols_root); 472 RB_INIT(&hmp->rb_inos_root); 473 RB_INIT(&hmp->rb_nods_root); 474 RB_INIT(&hmp->rb_undo_root); 475 RB_INIT(&hmp->rb_resv_root); 476 RB_INIT(&hmp->rb_bufs_root); 477 RB_INIT(&hmp->rb_pfsm_root); 478 479 hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); 480 481 TAILQ_INIT(&hmp->volu_list); 482 TAILQ_INIT(&hmp->undo_list); 483 TAILQ_INIT(&hmp->data_list); 484 TAILQ_INIT(&hmp->meta_list); 485 TAILQ_INIT(&hmp->lose_list); 486 487 /* 488 * Load volumes 489 */ 490 path = objcache_get(namei_oc, M_WAITOK); 491 hmp->nvolumes = -1; 492 for (i = 0; i < info.nvolumes; ++i) { 493 if (mntpt == NULL) { 494 /* 495 * Root mount. 496 * Only one volume; and no need for copyin. 497 */ 498 KKASSERT(info.nvolumes == 1); 499 ksnprintf(path, MAXPATHLEN, "/dev/%s", 500 mp->mnt_stat.f_mntfromname); 501 error = 0; 502 } else { 503 error = copyin(&info.volumes[i], &upath, 504 sizeof(char *)); 505 if (error == 0) 506 error = copyinstr(upath, path, 507 MAXPATHLEN, NULL); 508 } 509 if (error == 0) 510 error = hammer_install_volume(hmp, path, devvp); 511 if (error) 512 break; 513 } 514 objcache_put(namei_oc, path); 515 516 /* 517 * Make sure we found a root volume 518 */ 519 if (error == 0 && hmp->rootvol == NULL) { 520 kprintf("hammer_mount: No root volume found!\n"); 521 error = EINVAL; 522 } 523 524 /* 525 * Check that all required volumes are available 526 */ 527 if (error == 0 && hammer_mountcheck_volumes(hmp)) { 528 kprintf("hammer_mount: Missing volumes, cannot mount!\n"); 529 error = EINVAL; 530 } 531 532 if (error) { 533 hammer_free_hmp(mp); 534 return (error); 535 } 536 537 /* 538 * No errors, setup enough of the mount point so we can lookup the 539 * root vnode. 540 */ 541 mp->mnt_iosize_max = MAXPHYS; 542 mp->mnt_kern_flag |= MNTK_FSMID; 543 544 /* 545 * note: f_iosize is used by vnode_pager_haspage() when constructing 546 * its VOP_BMAP call. 547 */ 548 mp->mnt_stat.f_iosize = HAMMER_BUFSIZE; 549 mp->mnt_stat.f_bsize = HAMMER_BUFSIZE; 550 551 mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE; 552 mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE; 553 554 mp->mnt_maxsymlinklen = 255; 555 mp->mnt_flag |= MNT_LOCAL; 556 557 vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops); 558 vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops); 559 vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops); 560 561 /* 562 * The root volume's ondisk pointer is only valid if we hold a 563 * reference to it. 564 */ 565 rootvol = hammer_get_root_volume(hmp, &error); 566 if (error) 567 goto failed; 568 569 /* 570 * Perform any necessary UNDO operations. The recovery code does 571 * call hammer_undo_lookup() so we have to pre-cache the blockmap, 572 * and then re-copy it again after recovery is complete. 573 * 574 * If this is a read-only mount the UNDO information is retained 575 * in memory in the form of dirty buffer cache buffers, and not 576 * written back to the media. 577 */ 578 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, 579 sizeof(hmp->blockmap)); 580 581 /* 582 * Check filesystem version 583 */ 584 hmp->version = rootvol->ondisk->vol_version; 585 if (hmp->version < HAMMER_VOL_VERSION_MIN || 586 hmp->version > HAMMER_VOL_VERSION_MAX) { 587 kprintf("HAMMER: mount unsupported fs version %d\n", 588 hmp->version); 589 error = ERANGE; 590 goto done; 591 } 592 593 /* 594 * The undo_rec_limit limits the size of flush groups to avoid 595 * blowing out the UNDO FIFO. This calculation is typically in 596 * the tens of thousands and is designed primarily when small 597 * HAMMER filesystems are created. 598 */ 599 hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100; 600 if (hammer_debug_general & 0x0001) 601 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit); 602 603 /* 604 * NOTE: Recover stage1 not only handles meta-data recovery, it 605 * also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems. 606 */ 607 error = hammer_recover_stage1(hmp, rootvol); 608 if (error) { 609 kprintf("Failed to recover HAMMER filesystem on mount\n"); 610 goto done; 611 } 612 613 /* 614 * Finish setup now that we have a good root volume. 615 * 616 * The top 16 bits of fsid.val[1] is a pfs id. 617 */ 618 ksnprintf(mp->mnt_stat.f_mntfromname, 619 sizeof(mp->mnt_stat.f_mntfromname), "%s", 620 rootvol->ondisk->vol_name); 621 mp->mnt_stat.f_fsid.val[0] = 622 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8); 623 mp->mnt_stat.f_fsid.val[1] = 624 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8); 625 mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF; 626 627 mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid; 628 mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid, 629 sizeof(mp->mnt_vstat.f_fsid_uuid)); 630 631 /* 632 * Certain often-modified fields in the root volume are cached in 633 * the hammer_mount structure so we do not have to generate lots 634 * of little UNDO structures for them. 635 * 636 * Recopy after recovery. This also has the side effect of 637 * setting our cached undo FIFO's first_offset, which serves to 638 * placemark the FIFO start for the NEXT flush cycle while the 639 * on-disk first_offset represents the LAST flush cycle. 640 */ 641 hmp->next_tid = rootvol->ondisk->vol0_next_tid; 642 hmp->flush_tid1 = hmp->next_tid; 643 hmp->flush_tid2 = hmp->next_tid; 644 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, 645 sizeof(hmp->blockmap)); 646 hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks; 647 648 hammer_flusher_create(hmp); 649 650 /* 651 * Locate the root directory using the root cluster's B-Tree as a 652 * starting point. The root directory uses an obj_id of 1. 653 * 654 * FUTURE: Leave the root directory cached referenced but unlocked 655 * in hmp->rootvp (need to flush it on unmount). 656 */ 657 error = hammer_vfs_vget(mp, NULL, 1, &rootvp); 658 if (error) 659 goto done; 660 vput(rootvp); 661 /*vn_unlock(hmp->rootvp);*/ 662 if (hmp->ronly == 0) 663 error = hammer_recover_stage2(hmp, rootvol); 664 665 done: 666 hammer_rel_volume(rootvol, 0); 667 failed: 668 /* 669 * Cleanup and return. 670 */ 671 if (error) 672 hammer_free_hmp(mp); 673 return (error); 674 } 675 676 static int 677 hammer_vfs_unmount(struct mount *mp, int mntflags) 678 { 679 #if 0 680 struct hammer_mount *hmp = (void *)mp->mnt_data; 681 #endif 682 int flags; 683 int error; 684 685 /* 686 * Clean out the vnodes 687 */ 688 flags = 0; 689 if (mntflags & MNT_FORCE) 690 flags |= FORCECLOSE; 691 if ((error = vflush(mp, 0, flags)) != 0) 692 return (error); 693 694 /* 695 * Clean up the internal mount structure and related entities. This 696 * may issue I/O. 697 */ 698 hammer_free_hmp(mp); 699 return(0); 700 } 701 702 /* 703 * Clean up the internal mount structure and disassociate it from the mount. 704 * This may issue I/O. 705 */ 706 static void 707 hammer_free_hmp(struct mount *mp) 708 { 709 struct hammer_mount *hmp = (void *)mp->mnt_data; 710 hammer_flush_group_t flg; 711 int count; 712 int dummy; 713 714 /* 715 * Flush anything dirty. This won't even run if the 716 * filesystem errored-out. 717 */ 718 count = 0; 719 while (hammer_flusher_haswork(hmp)) { 720 hammer_flusher_sync(hmp); 721 ++count; 722 if (count >= 5) { 723 if (count == 5) 724 kprintf("HAMMER: umount flushing."); 725 else 726 kprintf("."); 727 tsleep(&dummy, 0, "hmrufl", hz); 728 } 729 if (count == 30) { 730 kprintf("giving up\n"); 731 break; 732 } 733 } 734 if (count >= 5 && count < 30) 735 kprintf("\n"); 736 737 /* 738 * If the mount had a critical error we have to destroy any 739 * remaining inodes before we can finish cleaning up the flusher. 740 */ 741 if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) { 742 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 743 hammer_destroy_inode_callback, NULL); 744 } 745 746 /* 747 * There shouldn't be any inodes left now and any left over 748 * flush groups should now be empty. 749 */ 750 KKASSERT(RB_EMPTY(&hmp->rb_inos_root)); 751 while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) { 752 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry); 753 KKASSERT(RB_EMPTY(&flg->flush_tree)); 754 if (flg->refs) { 755 kprintf("HAMMER: Warning, flush_group %p was " 756 "not empty on umount!\n", flg); 757 } 758 kfree(flg, hmp->m_misc); 759 } 760 761 /* 762 * We can finally destroy the flusher 763 */ 764 hammer_flusher_destroy(hmp); 765 766 /* 767 * We may have held recovered buffers due to a read-only mount. 768 * These must be discarded. 769 */ 770 if (hmp->ronly) 771 hammer_recover_flush_buffers(hmp, NULL, -1); 772 773 /* 774 * Unload buffers and then volumes 775 */ 776 RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL, 777 hammer_unload_buffer, NULL); 778 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 779 hammer_unload_volume, NULL); 780 781 mp->mnt_data = NULL; 782 mp->mnt_flag &= ~MNT_LOCAL; 783 hmp->mp = NULL; 784 hammer_destroy_objid_cache(hmp); 785 kmalloc_destroy(&hmp->m_misc); 786 kmalloc_destroy(&hmp->m_inodes); 787 kfree(hmp, M_HAMMER); 788 } 789 790 /* 791 * Report critical errors. ip may be NULL. 792 */ 793 void 794 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip, 795 int error, const char *msg) 796 { 797 hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR; 798 799 krateprintf(&hmp->krate, 800 "HAMMER(%s): Critical error inode=%jd error=%d %s\n", 801 hmp->mp->mnt_stat.f_mntfromname, 802 (intmax_t)(ip ? ip->obj_id : -1), 803 error, msg); 804 805 if (hmp->ronly == 0) { 806 hmp->ronly = 2; /* special errored read-only mode */ 807 hmp->mp->mnt_flag |= MNT_RDONLY; 808 kprintf("HAMMER(%s): Forcing read-only mode\n", 809 hmp->mp->mnt_stat.f_mntfromname); 810 } 811 hmp->error = error; 812 if (hammer_debug_critical) 813 Debugger("Entering debugger"); 814 } 815 816 817 /* 818 * Obtain a vnode for the specified inode number. An exclusively locked 819 * vnode is returned. 820 */ 821 int 822 hammer_vfs_vget(struct mount *mp, struct vnode *dvp, 823 ino_t ino, struct vnode **vpp) 824 { 825 struct hammer_transaction trans; 826 struct hammer_mount *hmp = (void *)mp->mnt_data; 827 struct hammer_inode *ip; 828 int error; 829 u_int32_t localization; 830 831 hammer_simple_transaction(&trans, hmp); 832 833 /* 834 * If a directory vnode is supplied (mainly NFS) then we can acquire 835 * the PFS domain from it. Otherwise we would only be able to vget 836 * inodes in the root PFS. 837 */ 838 if (dvp) { 839 localization = HAMMER_DEF_LOCALIZATION + 840 VTOI(dvp)->obj_localization; 841 } else { 842 localization = HAMMER_DEF_LOCALIZATION; 843 } 844 845 /* 846 * Lookup the requested HAMMER inode. The structure must be 847 * left unlocked while we manipulate the related vnode to avoid 848 * a deadlock. 849 */ 850 ip = hammer_get_inode(&trans, NULL, ino, 851 hmp->asof, localization, 852 0, &error); 853 if (ip == NULL) { 854 *vpp = NULL; 855 hammer_done_transaction(&trans); 856 return(error); 857 } 858 error = hammer_get_vnode(ip, vpp); 859 hammer_rel_inode(ip, 0); 860 hammer_done_transaction(&trans); 861 return (error); 862 } 863 864 /* 865 * Return the root vnode for the filesystem. 866 * 867 * HAMMER stores the root vnode in the hammer_mount structure so 868 * getting it is easy. 869 */ 870 static int 871 hammer_vfs_root(struct mount *mp, struct vnode **vpp) 872 { 873 #if 0 874 struct hammer_mount *hmp = (void *)mp->mnt_data; 875 #endif 876 int error; 877 878 error = hammer_vfs_vget(mp, NULL, 1, vpp); 879 return (error); 880 } 881 882 static int 883 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 884 { 885 struct hammer_mount *hmp = (void *)mp->mnt_data; 886 hammer_volume_t volume; 887 hammer_volume_ondisk_t ondisk; 888 int error; 889 int64_t bfree; 890 int64_t breserved; 891 892 volume = hammer_get_root_volume(hmp, &error); 893 if (error) 894 return(error); 895 ondisk = volume->ondisk; 896 897 /* 898 * Basic stats 899 */ 900 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved); 901 mp->mnt_stat.f_files = ondisk->vol0_stat_inodes; 902 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE; 903 hammer_rel_volume(volume, 0); 904 905 mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE; 906 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree; 907 if (mp->mnt_stat.f_files < 0) 908 mp->mnt_stat.f_files = 0; 909 910 *sbp = mp->mnt_stat; 911 return(0); 912 } 913 914 static int 915 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 916 { 917 struct hammer_mount *hmp = (void *)mp->mnt_data; 918 hammer_volume_t volume; 919 hammer_volume_ondisk_t ondisk; 920 int error; 921 int64_t bfree; 922 int64_t breserved; 923 924 volume = hammer_get_root_volume(hmp, &error); 925 if (error) 926 return(error); 927 ondisk = volume->ondisk; 928 929 /* 930 * Basic stats 931 */ 932 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved); 933 mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes; 934 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE; 935 hammer_rel_volume(volume, 0); 936 937 mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE; 938 mp->mnt_vstat.f_bavail = mp->mnt_stat.f_bfree; 939 if (mp->mnt_vstat.f_files < 0) 940 mp->mnt_vstat.f_files = 0; 941 *sbp = mp->mnt_vstat; 942 return(0); 943 } 944 945 /* 946 * Sync the filesystem. Currently we have to run it twice, the second 947 * one will advance the undo start index to the end index, so if a crash 948 * occurs no undos will be run on mount. 949 * 950 * We do not sync the filesystem if we are called from a panic. If we did 951 * we might end up blowing up a sync that was already in progress. 952 */ 953 static int 954 hammer_vfs_sync(struct mount *mp, int waitfor) 955 { 956 struct hammer_mount *hmp = (void *)mp->mnt_data; 957 int error; 958 959 if (panicstr == NULL) { 960 error = hammer_sync_hmp(hmp, waitfor); 961 } else { 962 error = EIO; 963 } 964 return (error); 965 } 966 967 /* 968 * Convert a vnode to a file handle. 969 */ 970 static int 971 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp) 972 { 973 hammer_inode_t ip; 974 975 KKASSERT(MAXFIDSZ >= 16); 976 ip = VTOI(vp); 977 fhp->fid_len = offsetof(struct fid, fid_data[16]); 978 fhp->fid_ext = ip->obj_localization >> 16; 979 bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id)); 980 bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof)); 981 return(0); 982 } 983 984 985 /* 986 * Convert a file handle back to a vnode. 987 * 988 * Use rootvp to enforce PFS isolation when a PFS is exported via a 989 * null mount. 990 */ 991 static int 992 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 993 struct fid *fhp, struct vnode **vpp) 994 { 995 struct hammer_transaction trans; 996 struct hammer_inode *ip; 997 struct hammer_inode_info info; 998 int error; 999 u_int32_t localization; 1000 1001 bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id)); 1002 bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof)); 1003 if (rootvp) 1004 localization = VTOI(rootvp)->obj_localization; 1005 else 1006 localization = (u_int32_t)fhp->fid_ext << 16; 1007 1008 hammer_simple_transaction(&trans, (void *)mp->mnt_data); 1009 1010 /* 1011 * Get/allocate the hammer_inode structure. The structure must be 1012 * unlocked while we manipulate the related vnode to avoid a 1013 * deadlock. 1014 */ 1015 ip = hammer_get_inode(&trans, NULL, info.obj_id, 1016 info.obj_asof, localization, 0, &error); 1017 if (ip == NULL) { 1018 *vpp = NULL; 1019 return(error); 1020 } 1021 error = hammer_get_vnode(ip, vpp); 1022 hammer_rel_inode(ip, 0); 1023 hammer_done_transaction(&trans); 1024 return (error); 1025 } 1026 1027 static int 1028 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 1029 int *exflagsp, struct ucred **credanonp) 1030 { 1031 hammer_mount_t hmp = (void *)mp->mnt_data; 1032 struct netcred *np; 1033 int error; 1034 1035 np = vfs_export_lookup(mp, &hmp->export, nam); 1036 if (np) { 1037 *exflagsp = np->netc_exflags; 1038 *credanonp = &np->netc_anon; 1039 error = 0; 1040 } else { 1041 error = EACCES; 1042 } 1043 return (error); 1044 1045 } 1046 1047 int 1048 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export) 1049 { 1050 hammer_mount_t hmp = (void *)mp->mnt_data; 1051 int error; 1052 1053 switch(op) { 1054 case MOUNTCTL_SET_EXPORT: 1055 error = vfs_export(mp, &hmp->export, export); 1056 break; 1057 default: 1058 error = EOPNOTSUPP; 1059 break; 1060 } 1061 return(error); 1062 } 1063 1064