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 /* 51 * NOTE! Global statistics may not be MPSAFE so HAMMER never uses them 52 * in conditionals. 53 */ 54 int hammer_supported_version = HAMMER_VOL_VERSION_DEFAULT; 55 int hammer_debug_io; 56 int hammer_debug_general; 57 int hammer_debug_debug = 1; /* medium-error panics */ 58 int hammer_debug_inode; 59 int hammer_debug_locks; 60 int hammer_debug_btree; 61 int hammer_debug_tid; 62 int hammer_debug_recover; /* -1 will disable, +1 will force */ 63 int hammer_debug_recover_faults; 64 int hammer_debug_critical; /* non-zero enter debugger on error */ 65 int hammer_cluster_enable = 1; /* enable read clustering by default */ 66 int hammer_count_fsyncs; 67 int hammer_count_inodes; 68 int hammer_count_iqueued; 69 int hammer_count_reclaiming; 70 int hammer_count_records; 71 int hammer_count_record_datas; 72 int hammer_count_volumes; 73 int hammer_count_buffers; 74 int hammer_count_nodes; 75 int64_t hammer_count_extra_space_used; 76 int64_t hammer_stats_btree_lookups; 77 int64_t hammer_stats_btree_searches; 78 int64_t hammer_stats_btree_inserts; 79 int64_t hammer_stats_btree_deletes; 80 int64_t hammer_stats_btree_elements; 81 int64_t hammer_stats_btree_splits; 82 int64_t hammer_stats_btree_iterations; 83 int64_t hammer_stats_btree_root_iterations; 84 int64_t hammer_stats_record_iterations; 85 86 int64_t hammer_stats_file_read; 87 int64_t hammer_stats_file_write; 88 int64_t hammer_stats_file_iopsr; 89 int64_t hammer_stats_file_iopsw; 90 int64_t hammer_stats_disk_read; 91 int64_t hammer_stats_disk_write; 92 int64_t hammer_stats_inode_flushes; 93 int64_t hammer_stats_commits; 94 int64_t hammer_stats_undo; 95 96 int hammer_count_dirtybufspace; /* global */ 97 int hammer_count_refedbufs; /* global */ 98 int hammer_count_reservations; 99 int hammer_count_io_running_read; 100 int hammer_count_io_running_write; 101 int hammer_count_io_locked; 102 int hammer_limit_dirtybufspace; /* per-mount */ 103 int hammer_limit_recs; /* as a whole XXX */ 104 int hammer_limit_inode_recs = 1024; /* per inode */ 105 int hammer_limit_reclaim = HAMMER_RECLAIM_WAIT; 106 int hammer_autoflush = 2000; /* auto flush */ 107 int hammer_bio_count; 108 int hammer_verify_zone; 109 int hammer_verify_data = 1; 110 int hammer_write_mode; 111 int hammer_yield_check = 16; 112 int hammer_fsync_mode; 113 int64_t hammer_contention_count; 114 int64_t hammer_zone_limit; 115 116 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem"); 117 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD, 118 &hammer_supported_version, 0, ""); 119 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW, 120 &hammer_debug_general, 0, ""); 121 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW, 122 &hammer_debug_io, 0, ""); 123 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW, 124 &hammer_debug_debug, 0, ""); 125 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW, 126 &hammer_debug_inode, 0, ""); 127 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW, 128 &hammer_debug_locks, 0, ""); 129 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW, 130 &hammer_debug_btree, 0, ""); 131 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW, 132 &hammer_debug_tid, 0, ""); 133 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW, 134 &hammer_debug_recover, 0, ""); 135 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW, 136 &hammer_debug_recover_faults, 0, ""); 137 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW, 138 &hammer_debug_critical, 0, ""); 139 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW, 140 &hammer_cluster_enable, 0, ""); 141 142 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW, 143 &hammer_limit_dirtybufspace, 0, ""); 144 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW, 145 &hammer_limit_recs, 0, ""); 146 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW, 147 &hammer_limit_inode_recs, 0, ""); 148 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaim, CTLFLAG_RW, 149 &hammer_limit_reclaim, 0, ""); 150 151 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD, 152 &hammer_count_fsyncs, 0, ""); 153 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD, 154 &hammer_count_inodes, 0, ""); 155 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD, 156 &hammer_count_iqueued, 0, ""); 157 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD, 158 &hammer_count_reclaiming, 0, ""); 159 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD, 160 &hammer_count_records, 0, ""); 161 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD, 162 &hammer_count_record_datas, 0, ""); 163 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD, 164 &hammer_count_volumes, 0, ""); 165 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD, 166 &hammer_count_buffers, 0, ""); 167 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD, 168 &hammer_count_nodes, 0, ""); 169 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD, 170 &hammer_count_extra_space_used, 0, ""); 171 172 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD, 173 &hammer_stats_btree_searches, 0, ""); 174 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD, 175 &hammer_stats_btree_lookups, 0, ""); 176 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD, 177 &hammer_stats_btree_inserts, 0, ""); 178 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD, 179 &hammer_stats_btree_deletes, 0, ""); 180 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD, 181 &hammer_stats_btree_elements, 0, ""); 182 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD, 183 &hammer_stats_btree_splits, 0, ""); 184 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD, 185 &hammer_stats_btree_iterations, 0, ""); 186 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD, 187 &hammer_stats_btree_root_iterations, 0, ""); 188 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD, 189 &hammer_stats_record_iterations, 0, ""); 190 191 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD, 192 &hammer_stats_file_read, 0, ""); 193 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD, 194 &hammer_stats_file_write, 0, ""); 195 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD, 196 &hammer_stats_file_iopsr, 0, ""); 197 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD, 198 &hammer_stats_file_iopsw, 0, ""); 199 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD, 200 &hammer_stats_disk_read, 0, ""); 201 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD, 202 &hammer_stats_disk_write, 0, ""); 203 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD, 204 &hammer_stats_inode_flushes, 0, ""); 205 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD, 206 &hammer_stats_commits, 0, ""); 207 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD, 208 &hammer_stats_undo, 0, ""); 209 210 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD, 211 &hammer_count_dirtybufspace, 0, ""); 212 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD, 213 &hammer_count_refedbufs, 0, ""); 214 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD, 215 &hammer_count_reservations, 0, ""); 216 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD, 217 &hammer_count_io_running_read, 0, ""); 218 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD, 219 &hammer_count_io_locked, 0, ""); 220 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD, 221 &hammer_count_io_running_write, 0, ""); 222 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW, 223 &hammer_zone_limit, 0, ""); 224 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW, 225 &hammer_contention_count, 0, ""); 226 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW, 227 &hammer_autoflush, 0, ""); 228 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW, 229 &hammer_verify_zone, 0, ""); 230 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW, 231 &hammer_verify_data, 0, ""); 232 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW, 233 &hammer_write_mode, 0, ""); 234 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW, 235 &hammer_yield_check, 0, ""); 236 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW, 237 &hammer_fsync_mode, 0, ""); 238 239 KTR_INFO_MASTER(hammer); 240 241 /* 242 * VFS ABI 243 */ 244 static void hammer_free_hmp(struct mount *mp); 245 246 static int hammer_vfs_mount(struct mount *mp, char *path, caddr_t data, 247 struct ucred *cred); 248 static int hammer_vfs_unmount(struct mount *mp, int mntflags); 249 static int hammer_vfs_root(struct mount *mp, struct vnode **vpp); 250 static int hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, 251 struct ucred *cred); 252 static int hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, 253 struct ucred *cred); 254 static int hammer_vfs_sync(struct mount *mp, int waitfor); 255 static int hammer_vfs_vget(struct mount *mp, struct vnode *dvp, 256 ino_t ino, struct vnode **vpp); 257 static int hammer_vfs_init(struct vfsconf *conf); 258 static int hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 259 struct fid *fhp, struct vnode **vpp); 260 static int hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp); 261 static int hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 262 int *exflagsp, struct ucred **credanonp); 263 264 265 static struct vfsops hammer_vfsops = { 266 .vfs_mount = hammer_vfs_mount, 267 .vfs_unmount = hammer_vfs_unmount, 268 .vfs_root = hammer_vfs_root, 269 .vfs_statfs = hammer_vfs_statfs, 270 .vfs_statvfs = hammer_vfs_statvfs, 271 .vfs_sync = hammer_vfs_sync, 272 .vfs_vget = hammer_vfs_vget, 273 .vfs_init = hammer_vfs_init, 274 .vfs_vptofh = hammer_vfs_vptofh, 275 .vfs_fhtovp = hammer_vfs_fhtovp, 276 .vfs_checkexp = hammer_vfs_checkexp 277 }; 278 279 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", ""); 280 281 VFS_SET(hammer_vfsops, hammer, 0); 282 MODULE_VERSION(hammer, 1); 283 284 static int 285 hammer_vfs_init(struct vfsconf *conf) 286 { 287 int n; 288 289 if (hammer_limit_recs == 0) { 290 hammer_limit_recs = nbuf * 25; 291 n = kmalloc_limit(M_HAMMER) / 512; 292 if (hammer_limit_recs > n) 293 hammer_limit_recs = n; 294 } 295 if (hammer_limit_dirtybufspace == 0) { 296 hammer_limit_dirtybufspace = hidirtybufspace / 2; 297 if (hammer_limit_dirtybufspace < 100) 298 hammer_limit_dirtybufspace = 100; 299 } 300 return(0); 301 } 302 303 static int 304 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data, 305 struct ucred *cred) 306 { 307 struct hammer_mount_info info; 308 hammer_mount_t hmp; 309 hammer_volume_t rootvol; 310 struct vnode *rootvp; 311 struct vnode *devvp = NULL; 312 const char *upath; /* volume name in userspace */ 313 char *path; /* volume name in system space */ 314 int error; 315 int i; 316 int master_id; 317 int maxinodes; 318 char *next_volume_ptr = NULL; 319 320 /* 321 * Accept hammer_mount_info. mntpt is NULL for root mounts at boot. 322 */ 323 if (mntpt == NULL) { 324 bzero(&info, sizeof(info)); 325 info.asof = 0; 326 info.hflags = 0; 327 info.nvolumes = 1; 328 329 next_volume_ptr = mp->mnt_stat.f_mntfromname; 330 331 /* Count number of volumes separated by ':' */ 332 for (char *p = next_volume_ptr; *p != '\0'; ++p) { 333 if (*p == ':') { 334 ++info.nvolumes; 335 } 336 } 337 338 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */ 339 } else { 340 if ((error = copyin(data, &info, sizeof(info))) != 0) 341 return (error); 342 } 343 344 /* 345 * updating or new mount 346 */ 347 if (mp->mnt_flag & MNT_UPDATE) { 348 hmp = (void *)mp->mnt_data; 349 KKASSERT(hmp != NULL); 350 } else { 351 if (info.nvolumes <= 0 || info.nvolumes >= 32768) 352 return (EINVAL); 353 hmp = NULL; 354 } 355 356 /* 357 * master-id validation. The master id may not be changed by a 358 * mount update. 359 */ 360 if (info.hflags & HMNT_MASTERID) { 361 if (hmp && hmp->master_id != info.master_id) { 362 kprintf("hammer: cannot change master id " 363 "with mount update\n"); 364 return(EINVAL); 365 } 366 master_id = info.master_id; 367 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS) 368 return (EINVAL); 369 } else { 370 if (hmp) 371 master_id = hmp->master_id; 372 else 373 master_id = 0; 374 } 375 376 /* 377 * Interal mount data structure 378 */ 379 if (hmp == NULL) { 380 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO); 381 mp->mnt_data = (qaddr_t)hmp; 382 hmp->mp = mp; 383 /*TAILQ_INIT(&hmp->recycle_list);*/ 384 385 /* 386 * Make sure kmalloc type limits are set appropriately. If root 387 * increases the vnode limit you may have to do a dummy remount 388 * to adjust the HAMMER inode limit. 389 */ 390 kmalloc_create(&hmp->m_misc, "HAMMER-others"); 391 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes"); 392 393 maxinodes = desiredvnodes + desiredvnodes / 5 + 394 hammer_limit_reclaim * 2; 395 kmalloc_raise_limit(hmp->m_inodes, 396 maxinodes * sizeof(struct hammer_inode)); 397 398 hmp->root_btree_beg.localization = 0x00000000U; 399 hmp->root_btree_beg.obj_id = -0x8000000000000000LL; 400 hmp->root_btree_beg.key = -0x8000000000000000LL; 401 hmp->root_btree_beg.create_tid = 1; 402 hmp->root_btree_beg.delete_tid = 1; 403 hmp->root_btree_beg.rec_type = 0; 404 hmp->root_btree_beg.obj_type = 0; 405 406 hmp->root_btree_end.localization = 0xFFFFFFFFU; 407 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL; 408 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL; 409 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL; 410 hmp->root_btree_end.delete_tid = 0; /* special case */ 411 hmp->root_btree_end.rec_type = 0xFFFFU; 412 hmp->root_btree_end.obj_type = 0; 413 414 hmp->krate.freq = 1; /* maximum reporting rate (hz) */ 415 hmp->krate.count = -16; /* initial burst */ 416 417 hmp->sync_lock.refs = 1; 418 hmp->free_lock.refs = 1; 419 hmp->undo_lock.refs = 1; 420 hmp->blkmap_lock.refs = 1; 421 hmp->snapshot_lock.refs = 1; 422 hmp->volume_lock.refs = 1; 423 424 TAILQ_INIT(&hmp->delay_list); 425 TAILQ_INIT(&hmp->flush_group_list); 426 TAILQ_INIT(&hmp->objid_cache_list); 427 TAILQ_INIT(&hmp->undo_lru_list); 428 TAILQ_INIT(&hmp->reclaim_list); 429 } 430 hmp->hflags &= ~HMNT_USERFLAGS; 431 hmp->hflags |= info.hflags & HMNT_USERFLAGS; 432 433 hmp->master_id = master_id; 434 435 if (info.asof) { 436 mp->mnt_flag |= MNT_RDONLY; 437 hmp->asof = info.asof; 438 } else { 439 hmp->asof = HAMMER_MAX_TID; 440 } 441 442 hmp->volume_to_remove = -1; 443 444 /* 445 * Re-open read-write if originally read-only, or vise-versa. 446 * 447 * When going from read-only to read-write execute the stage2 448 * recovery if it has not already been run. 449 */ 450 if (mp->mnt_flag & MNT_UPDATE) { 451 error = 0; 452 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 453 kprintf("HAMMER read-only -> read-write\n"); 454 hmp->ronly = 0; 455 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 456 hammer_adjust_volume_mode, NULL); 457 rootvol = hammer_get_root_volume(hmp, &error); 458 if (rootvol) { 459 hammer_recover_flush_buffers(hmp, rootvol, 1); 460 error = hammer_recover_stage2(hmp, rootvol); 461 bcopy(rootvol->ondisk->vol0_blockmap, 462 hmp->blockmap, 463 sizeof(hmp->blockmap)); 464 hammer_rel_volume(rootvol, 0); 465 } 466 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 467 hammer_reload_inode, NULL); 468 /* kernel clears MNT_RDONLY */ 469 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 470 kprintf("HAMMER read-write -> read-only\n"); 471 hmp->ronly = 1; /* messy */ 472 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 473 hammer_reload_inode, NULL); 474 hmp->ronly = 0; 475 hammer_flusher_sync(hmp); 476 hammer_flusher_sync(hmp); 477 hammer_flusher_sync(hmp); 478 hmp->ronly = 1; 479 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 480 hammer_adjust_volume_mode, NULL); 481 } 482 return(error); 483 } 484 485 RB_INIT(&hmp->rb_vols_root); 486 RB_INIT(&hmp->rb_inos_root); 487 RB_INIT(&hmp->rb_nods_root); 488 RB_INIT(&hmp->rb_undo_root); 489 RB_INIT(&hmp->rb_resv_root); 490 RB_INIT(&hmp->rb_bufs_root); 491 RB_INIT(&hmp->rb_pfsm_root); 492 493 hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); 494 495 TAILQ_INIT(&hmp->volu_list); 496 TAILQ_INIT(&hmp->undo_list); 497 TAILQ_INIT(&hmp->data_list); 498 TAILQ_INIT(&hmp->meta_list); 499 TAILQ_INIT(&hmp->lose_list); 500 501 /* 502 * Load volumes 503 */ 504 path = objcache_get(namei_oc, M_WAITOK); 505 hmp->nvolumes = -1; 506 for (i = 0; i < info.nvolumes; ++i) { 507 if (mntpt == NULL) { 508 /* 509 * Root mount. 510 */ 511 KKASSERT(next_volume_ptr != NULL); 512 strcpy(path, ""); 513 if (*next_volume_ptr != '/') { 514 /* relative path */ 515 strcpy(path, "/dev/"); 516 } 517 int k; 518 for (k = strlen(path); k < MAXPATHLEN-1; ++k) { 519 if (*next_volume_ptr == '\0') { 520 break; 521 } else if (*next_volume_ptr == ':') { 522 ++next_volume_ptr; 523 break; 524 } else { 525 path[k] = *next_volume_ptr; 526 ++next_volume_ptr; 527 } 528 } 529 path[k] = '\0'; 530 531 error = 0; 532 cdev_t dev = kgetdiskbyname(path); 533 error = bdevvp(dev, &devvp); 534 if (error) { 535 kprintf("hammer_mountroot: can't find devvp\n"); 536 } 537 } else { 538 error = copyin(&info.volumes[i], &upath, 539 sizeof(char *)); 540 if (error == 0) 541 error = copyinstr(upath, path, 542 MAXPATHLEN, NULL); 543 } 544 if (error == 0) 545 error = hammer_install_volume(hmp, path, devvp); 546 if (error) 547 break; 548 } 549 objcache_put(namei_oc, path); 550 551 /* 552 * Make sure we found a root volume 553 */ 554 if (error == 0 && hmp->rootvol == NULL) { 555 kprintf("hammer_mount: No root volume found!\n"); 556 error = EINVAL; 557 } 558 559 /* 560 * Check that all required volumes are available 561 */ 562 if (error == 0 && hammer_mountcheck_volumes(hmp)) { 563 kprintf("hammer_mount: Missing volumes, cannot mount!\n"); 564 error = EINVAL; 565 } 566 567 if (error) { 568 hammer_free_hmp(mp); 569 return (error); 570 } 571 572 /* 573 * No errors, setup enough of the mount point so we can lookup the 574 * root vnode. 575 */ 576 mp->mnt_iosize_max = MAXPHYS; 577 mp->mnt_kern_flag |= MNTK_FSMID; 578 579 /* 580 * MPSAFE code. Note that VOPs and VFSops which are not MPSAFE 581 * will acquire a per-mount token prior to entry and release it 582 * on return, so even if we do not specify it we no longer get 583 * the BGL regardlless of how we are flagged. 584 */ 585 mp->mnt_kern_flag |= MNTK_RD_MPSAFE | MNTK_GA_MPSAFE | 586 MNTK_IN_MPSAFE; 587 588 /* 589 * note: f_iosize is used by vnode_pager_haspage() when constructing 590 * its VOP_BMAP call. 591 */ 592 mp->mnt_stat.f_iosize = HAMMER_BUFSIZE; 593 mp->mnt_stat.f_bsize = HAMMER_BUFSIZE; 594 595 mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE; 596 mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE; 597 598 mp->mnt_maxsymlinklen = 255; 599 mp->mnt_flag |= MNT_LOCAL; 600 601 vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops); 602 vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops); 603 vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops); 604 605 /* 606 * The root volume's ondisk pointer is only valid if we hold a 607 * reference to it. 608 */ 609 rootvol = hammer_get_root_volume(hmp, &error); 610 if (error) 611 goto failed; 612 613 /* 614 * Perform any necessary UNDO operations. The recovery code does 615 * call hammer_undo_lookup() so we have to pre-cache the blockmap, 616 * and then re-copy it again after recovery is complete. 617 * 618 * If this is a read-only mount the UNDO information is retained 619 * in memory in the form of dirty buffer cache buffers, and not 620 * written back to the media. 621 */ 622 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, 623 sizeof(hmp->blockmap)); 624 625 /* 626 * Check filesystem version 627 */ 628 hmp->version = rootvol->ondisk->vol_version; 629 if (hmp->version < HAMMER_VOL_VERSION_MIN || 630 hmp->version > HAMMER_VOL_VERSION_MAX) { 631 kprintf("HAMMER: mount unsupported fs version %d\n", 632 hmp->version); 633 error = ERANGE; 634 goto done; 635 } 636 637 /* 638 * The undo_rec_limit limits the size of flush groups to avoid 639 * blowing out the UNDO FIFO. This calculation is typically in 640 * the tens of thousands and is designed primarily when small 641 * HAMMER filesystems are created. 642 */ 643 hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100; 644 if (hammer_debug_general & 0x0001) 645 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit); 646 647 /* 648 * NOTE: Recover stage1 not only handles meta-data recovery, it 649 * also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems. 650 */ 651 error = hammer_recover_stage1(hmp, rootvol); 652 if (error) { 653 kprintf("Failed to recover HAMMER filesystem on mount\n"); 654 goto done; 655 } 656 657 /* 658 * Finish setup now that we have a good root volume. 659 * 660 * The top 16 bits of fsid.val[1] is a pfs id. 661 */ 662 ksnprintf(mp->mnt_stat.f_mntfromname, 663 sizeof(mp->mnt_stat.f_mntfromname), "%s", 664 rootvol->ondisk->vol_name); 665 mp->mnt_stat.f_fsid.val[0] = 666 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8); 667 mp->mnt_stat.f_fsid.val[1] = 668 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8); 669 mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF; 670 671 mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid; 672 mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid, 673 sizeof(mp->mnt_vstat.f_fsid_uuid)); 674 675 /* 676 * Certain often-modified fields in the root volume are cached in 677 * the hammer_mount structure so we do not have to generate lots 678 * of little UNDO structures for them. 679 * 680 * Recopy after recovery. This also has the side effect of 681 * setting our cached undo FIFO's first_offset, which serves to 682 * placemark the FIFO start for the NEXT flush cycle while the 683 * on-disk first_offset represents the LAST flush cycle. 684 */ 685 hmp->next_tid = rootvol->ondisk->vol0_next_tid; 686 hmp->flush_tid1 = hmp->next_tid; 687 hmp->flush_tid2 = hmp->next_tid; 688 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, 689 sizeof(hmp->blockmap)); 690 hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks; 691 692 hammer_flusher_create(hmp); 693 694 /* 695 * Locate the root directory using the root cluster's B-Tree as a 696 * starting point. The root directory uses an obj_id of 1. 697 * 698 * FUTURE: Leave the root directory cached referenced but unlocked 699 * in hmp->rootvp (need to flush it on unmount). 700 */ 701 error = hammer_vfs_vget(mp, NULL, 1, &rootvp); 702 if (error) 703 goto done; 704 vput(rootvp); 705 /*vn_unlock(hmp->rootvp);*/ 706 if (hmp->ronly == 0) 707 error = hammer_recover_stage2(hmp, rootvol); 708 709 done: 710 hammer_rel_volume(rootvol, 0); 711 failed: 712 /* 713 * Cleanup and return. 714 */ 715 if (error) 716 hammer_free_hmp(mp); 717 return (error); 718 } 719 720 static int 721 hammer_vfs_unmount(struct mount *mp, int mntflags) 722 { 723 #if 0 724 struct hammer_mount *hmp = (void *)mp->mnt_data; 725 #endif 726 int flags; 727 int error; 728 729 /* 730 * Clean out the vnodes 731 */ 732 flags = 0; 733 if (mntflags & MNT_FORCE) 734 flags |= FORCECLOSE; 735 if ((error = vflush(mp, 0, flags)) != 0) 736 return (error); 737 738 /* 739 * Clean up the internal mount structure and related entities. This 740 * may issue I/O. 741 */ 742 hammer_free_hmp(mp); 743 return(0); 744 } 745 746 /* 747 * Clean up the internal mount structure and disassociate it from the mount. 748 * This may issue I/O. 749 */ 750 static void 751 hammer_free_hmp(struct mount *mp) 752 { 753 struct hammer_mount *hmp = (void *)mp->mnt_data; 754 hammer_flush_group_t flg; 755 int count; 756 int dummy; 757 758 /* 759 * Flush anything dirty. This won't even run if the 760 * filesystem errored-out. 761 */ 762 count = 0; 763 while (hammer_flusher_haswork(hmp)) { 764 hammer_flusher_sync(hmp); 765 ++count; 766 if (count >= 5) { 767 if (count == 5) 768 kprintf("HAMMER: umount flushing."); 769 else 770 kprintf("."); 771 tsleep(&dummy, 0, "hmrufl", hz); 772 } 773 if (count == 30) { 774 kprintf("giving up\n"); 775 break; 776 } 777 } 778 if (count >= 5 && count < 30) 779 kprintf("\n"); 780 781 /* 782 * If the mount had a critical error we have to destroy any 783 * remaining inodes before we can finish cleaning up the flusher. 784 */ 785 if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) { 786 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 787 hammer_destroy_inode_callback, NULL); 788 } 789 790 /* 791 * There shouldn't be any inodes left now and any left over 792 * flush groups should now be empty. 793 */ 794 KKASSERT(RB_EMPTY(&hmp->rb_inos_root)); 795 while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) { 796 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry); 797 KKASSERT(RB_EMPTY(&flg->flush_tree)); 798 if (flg->refs) { 799 kprintf("HAMMER: Warning, flush_group %p was " 800 "not empty on umount!\n", flg); 801 } 802 kfree(flg, hmp->m_misc); 803 } 804 805 /* 806 * We can finally destroy the flusher 807 */ 808 hammer_flusher_destroy(hmp); 809 810 /* 811 * We may have held recovered buffers due to a read-only mount. 812 * These must be discarded. 813 */ 814 if (hmp->ronly) 815 hammer_recover_flush_buffers(hmp, NULL, -1); 816 817 /* 818 * Unload buffers and then volumes 819 */ 820 RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL, 821 hammer_unload_buffer, NULL); 822 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 823 hammer_unload_volume, NULL); 824 825 mp->mnt_data = NULL; 826 mp->mnt_flag &= ~MNT_LOCAL; 827 hmp->mp = NULL; 828 hammer_destroy_objid_cache(hmp); 829 kmalloc_destroy(&hmp->m_misc); 830 kmalloc_destroy(&hmp->m_inodes); 831 kfree(hmp, M_HAMMER); 832 } 833 834 /* 835 * Report critical errors. ip may be NULL. 836 */ 837 void 838 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip, 839 int error, const char *msg) 840 { 841 hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR; 842 843 krateprintf(&hmp->krate, 844 "HAMMER(%s): Critical error inode=%jd error=%d %s\n", 845 hmp->mp->mnt_stat.f_mntfromname, 846 (intmax_t)(ip ? ip->obj_id : -1), 847 error, msg); 848 849 if (hmp->ronly == 0) { 850 hmp->ronly = 2; /* special errored read-only mode */ 851 hmp->mp->mnt_flag |= MNT_RDONLY; 852 kprintf("HAMMER(%s): Forcing read-only mode\n", 853 hmp->mp->mnt_stat.f_mntfromname); 854 } 855 hmp->error = error; 856 if (hammer_debug_critical) 857 Debugger("Entering debugger"); 858 } 859 860 861 /* 862 * Obtain a vnode for the specified inode number. An exclusively locked 863 * vnode is returned. 864 */ 865 int 866 hammer_vfs_vget(struct mount *mp, struct vnode *dvp, 867 ino_t ino, struct vnode **vpp) 868 { 869 struct hammer_transaction trans; 870 struct hammer_mount *hmp = (void *)mp->mnt_data; 871 struct hammer_inode *ip; 872 int error; 873 u_int32_t localization; 874 875 hammer_simple_transaction(&trans, hmp); 876 877 /* 878 * If a directory vnode is supplied (mainly NFS) then we can acquire 879 * the PFS domain from it. Otherwise we would only be able to vget 880 * inodes in the root PFS. 881 */ 882 if (dvp) { 883 localization = HAMMER_DEF_LOCALIZATION + 884 VTOI(dvp)->obj_localization; 885 } else { 886 localization = HAMMER_DEF_LOCALIZATION; 887 } 888 889 /* 890 * Lookup the requested HAMMER inode. The structure must be 891 * left unlocked while we manipulate the related vnode to avoid 892 * a deadlock. 893 */ 894 ip = hammer_get_inode(&trans, NULL, ino, 895 hmp->asof, localization, 896 0, &error); 897 if (ip == NULL) { 898 *vpp = NULL; 899 hammer_done_transaction(&trans); 900 return(error); 901 } 902 error = hammer_get_vnode(ip, vpp); 903 hammer_rel_inode(ip, 0); 904 hammer_done_transaction(&trans); 905 return (error); 906 } 907 908 /* 909 * Return the root vnode for the filesystem. 910 * 911 * HAMMER stores the root vnode in the hammer_mount structure so 912 * getting it is easy. 913 */ 914 static int 915 hammer_vfs_root(struct mount *mp, struct vnode **vpp) 916 { 917 #if 0 918 struct hammer_mount *hmp = (void *)mp->mnt_data; 919 #endif 920 int error; 921 922 error = hammer_vfs_vget(mp, NULL, 1, vpp); 923 return (error); 924 } 925 926 static int 927 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 928 { 929 struct hammer_mount *hmp = (void *)mp->mnt_data; 930 hammer_volume_t volume; 931 hammer_volume_ondisk_t ondisk; 932 int error; 933 int64_t bfree; 934 int64_t breserved; 935 936 volume = hammer_get_root_volume(hmp, &error); 937 if (error) 938 return(error); 939 ondisk = volume->ondisk; 940 941 /* 942 * Basic stats 943 */ 944 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved); 945 mp->mnt_stat.f_files = ondisk->vol0_stat_inodes; 946 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE; 947 hammer_rel_volume(volume, 0); 948 949 mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE; 950 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree; 951 if (mp->mnt_stat.f_files < 0) 952 mp->mnt_stat.f_files = 0; 953 954 *sbp = mp->mnt_stat; 955 return(0); 956 } 957 958 static int 959 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 960 { 961 struct hammer_mount *hmp = (void *)mp->mnt_data; 962 hammer_volume_t volume; 963 hammer_volume_ondisk_t ondisk; 964 int error; 965 int64_t bfree; 966 int64_t breserved; 967 968 volume = hammer_get_root_volume(hmp, &error); 969 if (error) 970 return(error); 971 ondisk = volume->ondisk; 972 973 /* 974 * Basic stats 975 */ 976 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved); 977 mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes; 978 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE; 979 hammer_rel_volume(volume, 0); 980 981 mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE; 982 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree; 983 if (mp->mnt_vstat.f_files < 0) 984 mp->mnt_vstat.f_files = 0; 985 *sbp = mp->mnt_vstat; 986 return(0); 987 } 988 989 /* 990 * Sync the filesystem. Currently we have to run it twice, the second 991 * one will advance the undo start index to the end index, so if a crash 992 * occurs no undos will be run on mount. 993 * 994 * We do not sync the filesystem if we are called from a panic. If we did 995 * we might end up blowing up a sync that was already in progress. 996 */ 997 static int 998 hammer_vfs_sync(struct mount *mp, int waitfor) 999 { 1000 struct hammer_mount *hmp = (void *)mp->mnt_data; 1001 int error; 1002 1003 if (panicstr == NULL) { 1004 error = hammer_sync_hmp(hmp, waitfor); 1005 } else { 1006 error = EIO; 1007 } 1008 return (error); 1009 } 1010 1011 /* 1012 * Convert a vnode to a file handle. 1013 */ 1014 static int 1015 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp) 1016 { 1017 hammer_inode_t ip; 1018 1019 KKASSERT(MAXFIDSZ >= 16); 1020 ip = VTOI(vp); 1021 fhp->fid_len = offsetof(struct fid, fid_data[16]); 1022 fhp->fid_ext = ip->obj_localization >> 16; 1023 bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id)); 1024 bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof)); 1025 return(0); 1026 } 1027 1028 1029 /* 1030 * Convert a file handle back to a vnode. 1031 * 1032 * Use rootvp to enforce PFS isolation when a PFS is exported via a 1033 * null mount. 1034 */ 1035 static int 1036 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 1037 struct fid *fhp, struct vnode **vpp) 1038 { 1039 struct hammer_transaction trans; 1040 struct hammer_inode *ip; 1041 struct hammer_inode_info info; 1042 int error; 1043 u_int32_t localization; 1044 1045 bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id)); 1046 bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof)); 1047 if (rootvp) 1048 localization = VTOI(rootvp)->obj_localization; 1049 else 1050 localization = (u_int32_t)fhp->fid_ext << 16; 1051 1052 hammer_simple_transaction(&trans, (void *)mp->mnt_data); 1053 1054 /* 1055 * Get/allocate the hammer_inode structure. The structure must be 1056 * unlocked while we manipulate the related vnode to avoid a 1057 * deadlock. 1058 */ 1059 ip = hammer_get_inode(&trans, NULL, info.obj_id, 1060 info.obj_asof, localization, 0, &error); 1061 if (ip == NULL) { 1062 *vpp = NULL; 1063 return(error); 1064 } 1065 error = hammer_get_vnode(ip, vpp); 1066 hammer_rel_inode(ip, 0); 1067 hammer_done_transaction(&trans); 1068 return (error); 1069 } 1070 1071 static int 1072 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 1073 int *exflagsp, struct ucred **credanonp) 1074 { 1075 hammer_mount_t hmp = (void *)mp->mnt_data; 1076 struct netcred *np; 1077 int error; 1078 1079 np = vfs_export_lookup(mp, &hmp->export, nam); 1080 if (np) { 1081 *exflagsp = np->netc_exflags; 1082 *credanonp = &np->netc_anon; 1083 error = 0; 1084 } else { 1085 error = EACCES; 1086 } 1087 return (error); 1088 1089 } 1090 1091 int 1092 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export) 1093 { 1094 hammer_mount_t hmp = (void *)mp->mnt_data; 1095 int error; 1096 1097 switch(op) { 1098 case MOUNTCTL_SET_EXPORT: 1099 error = vfs_export(mp, &hmp->export, export); 1100 break; 1101 default: 1102 error = EOPNOTSUPP; 1103 break; 1104 } 1105 return(error); 1106 } 1107 1108