1 /* 2 * Copyright (c) 2007-2008 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $DragonFly: src/sys/vfs/hammer/hammer_vfsops.c,v 1.74 2008/11/13 02:18:43 dillon Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/vnode.h> 41 #include <sys/mount.h> 42 #include <sys/malloc.h> 43 #include <sys/nlookup.h> 44 #include <sys/fcntl.h> 45 #include <sys/sysctl.h> 46 #include <sys/buf.h> 47 #include <sys/buf2.h> 48 #include "hammer.h" 49 50 int hammer_debug_io; 51 int hammer_debug_general; 52 int hammer_debug_debug = 1; /* medium-error panics */ 53 int hammer_debug_inode; 54 int hammer_debug_locks; 55 int hammer_debug_btree; 56 int hammer_debug_tid; 57 int hammer_debug_recover; /* -1 will disable, +1 will force */ 58 int hammer_debug_recover_faults; 59 int hammer_cluster_enable = 1; /* enable read clustering by default */ 60 int hammer_count_fsyncs; 61 int hammer_count_inodes; 62 int hammer_count_iqueued; 63 int hammer_count_reclaiming; 64 int hammer_count_records; 65 int hammer_count_record_datas; 66 int hammer_count_volumes; 67 int hammer_count_buffers; 68 int hammer_count_nodes; 69 int64_t hammer_count_extra_space_used; 70 int64_t hammer_stats_btree_lookups; 71 int64_t hammer_stats_btree_searches; 72 int64_t hammer_stats_btree_inserts; 73 int64_t hammer_stats_btree_deletes; 74 int64_t hammer_stats_btree_elements; 75 int64_t hammer_stats_btree_splits; 76 int64_t hammer_stats_btree_iterations; 77 int64_t hammer_stats_record_iterations; 78 79 int64_t hammer_stats_file_read; 80 int64_t hammer_stats_file_write; 81 int64_t hammer_stats_file_iopsr; 82 int64_t hammer_stats_file_iopsw; 83 int64_t hammer_stats_disk_read; 84 int64_t hammer_stats_disk_write; 85 int64_t hammer_stats_inode_flushes; 86 int64_t hammer_stats_commits; 87 88 int hammer_count_dirtybufspace; /* global */ 89 int hammer_count_refedbufs; /* global */ 90 int hammer_count_reservations; 91 int hammer_count_io_running_read; 92 int hammer_count_io_running_write; 93 int hammer_count_io_locked; 94 int hammer_limit_dirtybufspace; /* per-mount */ 95 int hammer_limit_recs; /* as a whole XXX */ 96 int hammer_autoflush = 2000; /* auto flush */ 97 int hammer_bio_count; 98 int hammer_verify_zone; 99 int hammer_verify_data = 1; 100 int hammer_write_mode; 101 int64_t hammer_contention_count; 102 int64_t hammer_zone_limit; 103 104 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem"); 105 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW, 106 &hammer_debug_general, 0, ""); 107 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW, 108 &hammer_debug_io, 0, ""); 109 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW, 110 &hammer_debug_debug, 0, ""); 111 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW, 112 &hammer_debug_inode, 0, ""); 113 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW, 114 &hammer_debug_locks, 0, ""); 115 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW, 116 &hammer_debug_btree, 0, ""); 117 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW, 118 &hammer_debug_tid, 0, ""); 119 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW, 120 &hammer_debug_recover, 0, ""); 121 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW, 122 &hammer_debug_recover_faults, 0, ""); 123 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW, 124 &hammer_cluster_enable, 0, ""); 125 126 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW, 127 &hammer_limit_dirtybufspace, 0, ""); 128 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW, 129 &hammer_limit_recs, 0, ""); 130 131 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD, 132 &hammer_count_fsyncs, 0, ""); 133 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD, 134 &hammer_count_inodes, 0, ""); 135 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD, 136 &hammer_count_iqueued, 0, ""); 137 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD, 138 &hammer_count_reclaiming, 0, ""); 139 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD, 140 &hammer_count_records, 0, ""); 141 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD, 142 &hammer_count_record_datas, 0, ""); 143 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD, 144 &hammer_count_volumes, 0, ""); 145 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD, 146 &hammer_count_buffers, 0, ""); 147 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD, 148 &hammer_count_nodes, 0, ""); 149 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD, 150 &hammer_count_extra_space_used, 0, ""); 151 152 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD, 153 &hammer_stats_btree_searches, 0, ""); 154 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD, 155 &hammer_stats_btree_lookups, 0, ""); 156 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD, 157 &hammer_stats_btree_inserts, 0, ""); 158 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD, 159 &hammer_stats_btree_deletes, 0, ""); 160 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD, 161 &hammer_stats_btree_elements, 0, ""); 162 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD, 163 &hammer_stats_btree_splits, 0, ""); 164 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD, 165 &hammer_stats_btree_iterations, 0, ""); 166 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD, 167 &hammer_stats_record_iterations, 0, ""); 168 169 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD, 170 &hammer_stats_file_read, 0, ""); 171 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD, 172 &hammer_stats_file_write, 0, ""); 173 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD, 174 &hammer_stats_file_iopsr, 0, ""); 175 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD, 176 &hammer_stats_file_iopsw, 0, ""); 177 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD, 178 &hammer_stats_disk_read, 0, ""); 179 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD, 180 &hammer_stats_disk_write, 0, ""); 181 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD, 182 &hammer_stats_inode_flushes, 0, ""); 183 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD, 184 &hammer_stats_commits, 0, ""); 185 186 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD, 187 &hammer_count_dirtybufspace, 0, ""); 188 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD, 189 &hammer_count_refedbufs, 0, ""); 190 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD, 191 &hammer_count_reservations, 0, ""); 192 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD, 193 &hammer_count_io_running_read, 0, ""); 194 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD, 195 &hammer_count_io_locked, 0, ""); 196 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD, 197 &hammer_count_io_running_write, 0, ""); 198 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW, 199 &hammer_zone_limit, 0, ""); 200 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW, 201 &hammer_contention_count, 0, ""); 202 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW, 203 &hammer_autoflush, 0, ""); 204 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW, 205 &hammer_verify_zone, 0, ""); 206 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW, 207 &hammer_verify_data, 0, ""); 208 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW, 209 &hammer_write_mode, 0, ""); 210 211 KTR_INFO_MASTER(hammer); 212 213 /* 214 * VFS ABI 215 */ 216 static void hammer_free_hmp(struct mount *mp); 217 218 static int hammer_vfs_mount(struct mount *mp, char *path, caddr_t data, 219 struct ucred *cred); 220 static int hammer_vfs_unmount(struct mount *mp, int mntflags); 221 static int hammer_vfs_root(struct mount *mp, struct vnode **vpp); 222 static int hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, 223 struct ucred *cred); 224 static int hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, 225 struct ucred *cred); 226 static int hammer_vfs_sync(struct mount *mp, int waitfor); 227 static int hammer_vfs_vget(struct mount *mp, ino_t ino, 228 struct vnode **vpp); 229 static int hammer_vfs_init(struct vfsconf *conf); 230 static int hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 231 struct fid *fhp, struct vnode **vpp); 232 static int hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp); 233 static int hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 234 int *exflagsp, struct ucred **credanonp); 235 236 237 static struct vfsops hammer_vfsops = { 238 .vfs_mount = hammer_vfs_mount, 239 .vfs_unmount = hammer_vfs_unmount, 240 .vfs_root = hammer_vfs_root, 241 .vfs_statfs = hammer_vfs_statfs, 242 .vfs_statvfs = hammer_vfs_statvfs, 243 .vfs_sync = hammer_vfs_sync, 244 .vfs_vget = hammer_vfs_vget, 245 .vfs_init = hammer_vfs_init, 246 .vfs_vptofh = hammer_vfs_vptofh, 247 .vfs_fhtovp = hammer_vfs_fhtovp, 248 .vfs_checkexp = hammer_vfs_checkexp 249 }; 250 251 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", ""); 252 253 VFS_SET(hammer_vfsops, hammer, 0); 254 MODULE_VERSION(hammer, 1); 255 256 static int 257 hammer_vfs_init(struct vfsconf *conf) 258 { 259 int n; 260 261 if (hammer_limit_recs == 0) { 262 hammer_limit_recs = nbuf * 25; 263 n = kmalloc_limit(M_HAMMER) / 512; 264 if (hammer_limit_recs > n) 265 hammer_limit_recs = n; 266 } 267 if (hammer_limit_dirtybufspace == 0) { 268 hammer_limit_dirtybufspace = hidirtybufspace / 2; 269 if (hammer_limit_dirtybufspace < 100) 270 hammer_limit_dirtybufspace = 100; 271 } 272 return(0); 273 } 274 275 static int 276 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data, 277 struct ucred *cred) 278 { 279 struct hammer_mount_info info; 280 hammer_mount_t hmp; 281 hammer_volume_t rootvol; 282 struct vnode *rootvp; 283 struct vnode *devvp = NULL; 284 const char *upath; /* volume name in userspace */ 285 char *path; /* volume name in system space */ 286 int error; 287 int i; 288 int master_id; 289 int maxinodes; 290 291 /* 292 * Accept hammer_mount_info. mntpt is NULL for root mounts at boot. 293 */ 294 if (mntpt == NULL) { 295 if ((error = bdevvp(rootdev, &devvp))) { 296 kprintf("hammer_mountroot: can't find devvp\n"); 297 return (error); 298 } 299 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */ 300 bzero(&info, sizeof(info)); 301 info.asof = 0; 302 info.hflags = 0; 303 info.nvolumes = 1; 304 } else { 305 if ((error = copyin(data, &info, sizeof(info))) != 0) 306 return (error); 307 } 308 309 /* 310 * updating or new mount 311 */ 312 if (mp->mnt_flag & MNT_UPDATE) { 313 hmp = (void *)mp->mnt_data; 314 KKASSERT(hmp != NULL); 315 } else { 316 if (info.nvolumes <= 0 || info.nvolumes >= 32768) 317 return (EINVAL); 318 hmp = NULL; 319 } 320 321 /* 322 * master-id validation. The master id may not be changed by a 323 * mount update. 324 */ 325 if (info.hflags & HMNT_MASTERID) { 326 if (hmp && hmp->master_id != info.master_id) { 327 kprintf("hammer: cannot change master id " 328 "with mount update\n"); 329 return(EINVAL); 330 } 331 master_id = info.master_id; 332 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS) 333 return (EINVAL); 334 } else { 335 if (hmp) 336 master_id = hmp->master_id; 337 else 338 master_id = 0; 339 } 340 341 /* 342 * Interal mount data structure 343 */ 344 if (hmp == NULL) { 345 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO); 346 mp->mnt_data = (qaddr_t)hmp; 347 hmp->mp = mp; 348 /*TAILQ_INIT(&hmp->recycle_list);*/ 349 350 /* 351 * Make sure kmalloc type limits are set appropriately. If root 352 * increases the vnode limit you may have to do a dummy remount 353 * to adjust the HAMMER inode limit. 354 */ 355 kmalloc_create(&hmp->m_misc, "HAMMER-others"); 356 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes"); 357 358 maxinodes = desiredvnodes + desiredvnodes / 5 + 359 HAMMER_RECLAIM_WAIT; 360 kmalloc_raise_limit(hmp->m_inodes, 361 maxinodes * sizeof(struct hammer_inode)); 362 363 hmp->root_btree_beg.localization = 0x00000000U; 364 hmp->root_btree_beg.obj_id = -0x8000000000000000LL; 365 hmp->root_btree_beg.key = -0x8000000000000000LL; 366 hmp->root_btree_beg.create_tid = 1; 367 hmp->root_btree_beg.delete_tid = 1; 368 hmp->root_btree_beg.rec_type = 0; 369 hmp->root_btree_beg.obj_type = 0; 370 371 hmp->root_btree_end.localization = 0xFFFFFFFFU; 372 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL; 373 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL; 374 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL; 375 hmp->root_btree_end.delete_tid = 0; /* special case */ 376 hmp->root_btree_end.rec_type = 0xFFFFU; 377 hmp->root_btree_end.obj_type = 0; 378 379 hmp->krate.freq = 1; /* maximum reporting rate (hz) */ 380 hmp->krate.count = -16; /* initial burst */ 381 382 hmp->sync_lock.refs = 1; 383 hmp->free_lock.refs = 1; 384 hmp->undo_lock.refs = 1; 385 hmp->blkmap_lock.refs = 1; 386 387 TAILQ_INIT(&hmp->delay_list); 388 TAILQ_INIT(&hmp->flush_group_list); 389 TAILQ_INIT(&hmp->objid_cache_list); 390 TAILQ_INIT(&hmp->undo_lru_list); 391 TAILQ_INIT(&hmp->reclaim_list); 392 } 393 hmp->hflags &= ~HMNT_USERFLAGS; 394 hmp->hflags |= info.hflags & HMNT_USERFLAGS; 395 396 hmp->master_id = master_id; 397 398 if (info.asof) { 399 mp->mnt_flag |= MNT_RDONLY; 400 hmp->asof = info.asof; 401 } else { 402 hmp->asof = HAMMER_MAX_TID; 403 } 404 405 /* 406 * Re-open read-write if originally read-only, or vise-versa. 407 */ 408 if (mp->mnt_flag & MNT_UPDATE) { 409 error = 0; 410 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 411 kprintf("HAMMER read-only -> read-write\n"); 412 hmp->ronly = 0; 413 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 414 hammer_adjust_volume_mode, NULL); 415 rootvol = hammer_get_root_volume(hmp, &error); 416 if (rootvol) { 417 hammer_recover_flush_buffers(hmp, rootvol, 1); 418 bcopy(rootvol->ondisk->vol0_blockmap, 419 hmp->blockmap, 420 sizeof(hmp->blockmap)); 421 hammer_rel_volume(rootvol, 0); 422 } 423 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 424 hammer_reload_inode, NULL); 425 /* kernel clears MNT_RDONLY */ 426 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 427 kprintf("HAMMER read-write -> read-only\n"); 428 hmp->ronly = 1; /* messy */ 429 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 430 hammer_reload_inode, NULL); 431 hmp->ronly = 0; 432 hammer_flusher_sync(hmp); 433 hammer_flusher_sync(hmp); 434 hammer_flusher_sync(hmp); 435 hmp->ronly = 1; 436 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 437 hammer_adjust_volume_mode, NULL); 438 } 439 return(error); 440 } 441 442 RB_INIT(&hmp->rb_vols_root); 443 RB_INIT(&hmp->rb_inos_root); 444 RB_INIT(&hmp->rb_nods_root); 445 RB_INIT(&hmp->rb_undo_root); 446 RB_INIT(&hmp->rb_resv_root); 447 RB_INIT(&hmp->rb_bufs_root); 448 RB_INIT(&hmp->rb_pfsm_root); 449 450 hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); 451 452 TAILQ_INIT(&hmp->volu_list); 453 TAILQ_INIT(&hmp->undo_list); 454 TAILQ_INIT(&hmp->data_list); 455 TAILQ_INIT(&hmp->meta_list); 456 TAILQ_INIT(&hmp->lose_list); 457 458 /* 459 * Load volumes 460 */ 461 path = objcache_get(namei_oc, M_WAITOK); 462 hmp->nvolumes = -1; 463 for (i = 0; i < info.nvolumes; ++i) { 464 if (mntpt == NULL) { 465 /* 466 * Root mount. 467 * Only one volume; and no need for copyin. 468 */ 469 KKASSERT(info.nvolumes == 1); 470 ksnprintf(path, MAXPATHLEN, "/dev/%s", 471 mp->mnt_stat.f_mntfromname); 472 error = 0; 473 } else { 474 error = copyin(&info.volumes[i], &upath, 475 sizeof(char *)); 476 if (error == 0) 477 error = copyinstr(upath, path, 478 MAXPATHLEN, NULL); 479 } 480 if (error == 0) 481 error = hammer_install_volume(hmp, path, devvp); 482 if (error) 483 break; 484 } 485 objcache_put(namei_oc, path); 486 487 /* 488 * Make sure we found a root volume 489 */ 490 if (error == 0 && hmp->rootvol == NULL) { 491 kprintf("hammer_mount: No root volume found!\n"); 492 error = EINVAL; 493 } 494 495 /* 496 * Check that all required volumes are available 497 */ 498 if (error == 0 && hammer_mountcheck_volumes(hmp)) { 499 kprintf("hammer_mount: Missing volumes, cannot mount!\n"); 500 error = EINVAL; 501 } 502 503 if (error) { 504 hammer_free_hmp(mp); 505 return (error); 506 } 507 508 /* 509 * No errors, setup enough of the mount point so we can lookup the 510 * root vnode. 511 */ 512 mp->mnt_iosize_max = MAXPHYS; 513 mp->mnt_kern_flag |= MNTK_FSMID; 514 515 /* 516 * note: f_iosize is used by vnode_pager_haspage() when constructing 517 * its VOP_BMAP call. 518 */ 519 mp->mnt_stat.f_iosize = HAMMER_BUFSIZE; 520 mp->mnt_stat.f_bsize = HAMMER_BUFSIZE; 521 522 mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE; 523 mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE; 524 525 mp->mnt_maxsymlinklen = 255; 526 mp->mnt_flag |= MNT_LOCAL; 527 528 vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops); 529 vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops); 530 vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops); 531 532 /* 533 * The root volume's ondisk pointer is only valid if we hold a 534 * reference to it. 535 */ 536 rootvol = hammer_get_root_volume(hmp, &error); 537 if (error) 538 goto failed; 539 540 /* 541 * Perform any necessary UNDO operations. The recovery code does 542 * call hammer_undo_lookup() so we have to pre-cache the blockmap, 543 * and then re-copy it again after recovery is complete. 544 * 545 * If this is a read-only mount the UNDO information is retained 546 * in memory in the form of dirty buffer cache buffers, and not 547 * written back to the media. 548 */ 549 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, 550 sizeof(hmp->blockmap)); 551 552 /* 553 * Check filesystem version 554 */ 555 hmp->version = rootvol->ondisk->vol_version; 556 if (hmp->version < HAMMER_VOL_VERSION_MIN || 557 hmp->version > HAMMER_VOL_VERSION_MAX) { 558 kprintf("HAMMER: mount unsupported fs version %d\n", 559 hmp->version); 560 error = ERANGE; 561 goto done; 562 } 563 564 /* 565 * The undo_rec_limit limits the size of flush groups to avoid 566 * blowing out the UNDO FIFO. This calculation is typically in 567 * the tens of thousands and is designed primarily when small 568 * HAMMER filesystems are created. 569 */ 570 hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100; 571 if (hammer_debug_general & 0x0001) 572 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit); 573 574 error = hammer_recover(hmp, rootvol); 575 if (error) { 576 kprintf("Failed to recover HAMMER filesystem on mount\n"); 577 goto done; 578 } 579 580 /* 581 * Finish setup now that we have a good root volume. 582 * 583 * The top 16 bits of fsid.val[1] is a pfs id. 584 */ 585 ksnprintf(mp->mnt_stat.f_mntfromname, 586 sizeof(mp->mnt_stat.f_mntfromname), "%s", 587 rootvol->ondisk->vol_name); 588 mp->mnt_stat.f_fsid.val[0] = 589 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8); 590 mp->mnt_stat.f_fsid.val[1] = 591 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8); 592 mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF; 593 594 mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid; 595 mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid, 596 sizeof(mp->mnt_vstat.f_fsid_uuid)); 597 598 /* 599 * Certain often-modified fields in the root volume are cached in 600 * the hammer_mount structure so we do not have to generate lots 601 * of little UNDO structures for them. 602 * 603 * Recopy after recovery. This also has the side effect of 604 * setting our cached undo FIFO's first_offset, which serves to 605 * placemark the FIFO start for the NEXT flush cycle while the 606 * on-disk first_offset represents the LAST flush cycle. 607 */ 608 hmp->next_tid = rootvol->ondisk->vol0_next_tid; 609 hmp->flush_tid1 = hmp->next_tid; 610 hmp->flush_tid2 = hmp->next_tid; 611 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, 612 sizeof(hmp->blockmap)); 613 hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks; 614 615 hammer_flusher_create(hmp); 616 617 /* 618 * Locate the root directory using the root cluster's B-Tree as a 619 * starting point. The root directory uses an obj_id of 1. 620 * 621 * FUTURE: Leave the root directory cached referenced but unlocked 622 * in hmp->rootvp (need to flush it on unmount). 623 */ 624 error = hammer_vfs_vget(mp, 1, &rootvp); 625 if (error) 626 goto done; 627 vput(rootvp); 628 /*vn_unlock(hmp->rootvp);*/ 629 630 done: 631 hammer_rel_volume(rootvol, 0); 632 failed: 633 /* 634 * Cleanup and return. 635 */ 636 if (error) 637 hammer_free_hmp(mp); 638 return (error); 639 } 640 641 static int 642 hammer_vfs_unmount(struct mount *mp, int mntflags) 643 { 644 #if 0 645 struct hammer_mount *hmp = (void *)mp->mnt_data; 646 #endif 647 int flags; 648 int error; 649 650 /* 651 * Clean out the vnodes 652 */ 653 flags = 0; 654 if (mntflags & MNT_FORCE) 655 flags |= FORCECLOSE; 656 if ((error = vflush(mp, 0, flags)) != 0) 657 return (error); 658 659 /* 660 * Clean up the internal mount structure and related entities. This 661 * may issue I/O. 662 */ 663 hammer_free_hmp(mp); 664 return(0); 665 } 666 667 /* 668 * Clean up the internal mount structure and disassociate it from the mount. 669 * This may issue I/O. 670 */ 671 static void 672 hammer_free_hmp(struct mount *mp) 673 { 674 struct hammer_mount *hmp = (void *)mp->mnt_data; 675 hammer_flush_group_t flg; 676 int count; 677 int dummy; 678 679 /* 680 * Flush anything dirty. This won't even run if the 681 * filesystem errored-out. 682 */ 683 count = 0; 684 while (hammer_flusher_haswork(hmp)) { 685 hammer_flusher_sync(hmp); 686 ++count; 687 if (count >= 5) { 688 if (count == 5) 689 kprintf("HAMMER: umount flushing."); 690 else 691 kprintf("."); 692 tsleep(&dummy, 0, "hmrufl", hz); 693 } 694 if (count == 30) { 695 kprintf("giving up\n"); 696 break; 697 } 698 } 699 if (count >= 5 && count < 30) 700 kprintf("\n"); 701 702 /* 703 * If the mount had a critical error we have to destroy any 704 * remaining inodes before we can finish cleaning up the flusher. 705 */ 706 if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) { 707 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 708 hammer_destroy_inode_callback, NULL); 709 } 710 711 /* 712 * There shouldn't be any inodes left now and any left over 713 * flush groups should now be empty. 714 */ 715 KKASSERT(RB_EMPTY(&hmp->rb_inos_root)); 716 while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) { 717 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry); 718 KKASSERT(TAILQ_EMPTY(&flg->flush_list)); 719 if (flg->refs) { 720 kprintf("HAMMER: Warning, flush_group %p was " 721 "not empty on umount!\n", flg); 722 } 723 kfree(flg, hmp->m_misc); 724 } 725 726 /* 727 * We can finally destroy the flusher 728 */ 729 hammer_flusher_destroy(hmp); 730 731 /* 732 * We may have held recovered buffers due to a read-only mount. 733 * These must be discarded. 734 */ 735 if (hmp->ronly) 736 hammer_recover_flush_buffers(hmp, NULL, -1); 737 738 /* 739 * Unload buffers and then volumes 740 */ 741 RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL, 742 hammer_unload_buffer, NULL); 743 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 744 hammer_unload_volume, NULL); 745 746 mp->mnt_data = NULL; 747 mp->mnt_flag &= ~MNT_LOCAL; 748 hmp->mp = NULL; 749 hammer_destroy_objid_cache(hmp); 750 kmalloc_destroy(&hmp->m_misc); 751 kmalloc_destroy(&hmp->m_inodes); 752 kfree(hmp, M_HAMMER); 753 } 754 755 /* 756 * Report critical errors. ip may be NULL. 757 */ 758 void 759 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip, 760 int error, const char *msg) 761 { 762 hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR; 763 krateprintf(&hmp->krate, 764 "HAMMER(%s): Critical error inode=%lld %s\n", 765 hmp->mp->mnt_stat.f_mntfromname, 766 (ip ? ip->obj_id : -1), msg); 767 if (hmp->ronly == 0) { 768 hmp->ronly = 2; /* special errored read-only mode */ 769 hmp->mp->mnt_flag |= MNT_RDONLY; 770 kprintf("HAMMER(%s): Forcing read-only mode\n", 771 hmp->mp->mnt_stat.f_mntfromname); 772 } 773 hmp->error = error; 774 } 775 776 777 /* 778 * Obtain a vnode for the specified inode number. An exclusively locked 779 * vnode is returned. 780 */ 781 int 782 hammer_vfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 783 { 784 struct hammer_transaction trans; 785 struct hammer_mount *hmp = (void *)mp->mnt_data; 786 struct hammer_inode *ip; 787 int error; 788 789 hammer_simple_transaction(&trans, hmp); 790 791 /* 792 * Lookup the requested HAMMER inode. The structure must be 793 * left unlocked while we manipulate the related vnode to avoid 794 * a deadlock. 795 */ 796 ip = hammer_get_inode(&trans, NULL, ino, 797 hmp->asof, HAMMER_DEF_LOCALIZATION, 798 0, &error); 799 if (ip == NULL) { 800 *vpp = NULL; 801 hammer_done_transaction(&trans); 802 return(error); 803 } 804 error = hammer_get_vnode(ip, vpp); 805 hammer_rel_inode(ip, 0); 806 hammer_done_transaction(&trans); 807 return (error); 808 } 809 810 /* 811 * Return the root vnode for the filesystem. 812 * 813 * HAMMER stores the root vnode in the hammer_mount structure so 814 * getting it is easy. 815 */ 816 static int 817 hammer_vfs_root(struct mount *mp, struct vnode **vpp) 818 { 819 #if 0 820 struct hammer_mount *hmp = (void *)mp->mnt_data; 821 #endif 822 int error; 823 824 error = hammer_vfs_vget(mp, 1, vpp); 825 return (error); 826 } 827 828 static int 829 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 830 { 831 struct hammer_mount *hmp = (void *)mp->mnt_data; 832 hammer_volume_t volume; 833 hammer_volume_ondisk_t ondisk; 834 int error; 835 int64_t bfree; 836 837 volume = hammer_get_root_volume(hmp, &error); 838 if (error) 839 return(error); 840 ondisk = volume->ondisk; 841 842 /* 843 * Basic stats 844 */ 845 mp->mnt_stat.f_files = ondisk->vol0_stat_inodes; 846 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE; 847 hammer_rel_volume(volume, 0); 848 849 mp->mnt_stat.f_bfree = bfree / HAMMER_BUFSIZE; 850 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree; 851 if (mp->mnt_stat.f_files < 0) 852 mp->mnt_stat.f_files = 0; 853 854 *sbp = mp->mnt_stat; 855 return(0); 856 } 857 858 static int 859 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 860 { 861 struct hammer_mount *hmp = (void *)mp->mnt_data; 862 hammer_volume_t volume; 863 hammer_volume_ondisk_t ondisk; 864 int error; 865 int64_t bfree; 866 867 volume = hammer_get_root_volume(hmp, &error); 868 if (error) 869 return(error); 870 ondisk = volume->ondisk; 871 872 /* 873 * Basic stats 874 */ 875 mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes; 876 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE; 877 hammer_rel_volume(volume, 0); 878 879 mp->mnt_vstat.f_bfree = bfree / HAMMER_BUFSIZE; 880 mp->mnt_vstat.f_bavail = mp->mnt_stat.f_bfree; 881 if (mp->mnt_vstat.f_files < 0) 882 mp->mnt_vstat.f_files = 0; 883 *sbp = mp->mnt_vstat; 884 return(0); 885 } 886 887 /* 888 * Sync the filesystem. Currently we have to run it twice, the second 889 * one will advance the undo start index to the end index, so if a crash 890 * occurs no undos will be run on mount. 891 * 892 * We do not sync the filesystem if we are called from a panic. If we did 893 * we might end up blowing up a sync that was already in progress. 894 */ 895 static int 896 hammer_vfs_sync(struct mount *mp, int waitfor) 897 { 898 struct hammer_mount *hmp = (void *)mp->mnt_data; 899 int error; 900 901 if (panicstr == NULL) { 902 error = hammer_sync_hmp(hmp, waitfor); 903 } else { 904 error = EIO; 905 } 906 return (error); 907 } 908 909 /* 910 * Convert a vnode to a file handle. 911 */ 912 static int 913 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp) 914 { 915 hammer_inode_t ip; 916 917 KKASSERT(MAXFIDSZ >= 16); 918 ip = VTOI(vp); 919 fhp->fid_len = offsetof(struct fid, fid_data[16]); 920 fhp->fid_ext = ip->obj_localization >> 16; 921 bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id)); 922 bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof)); 923 return(0); 924 } 925 926 927 /* 928 * Convert a file handle back to a vnode. 929 * 930 * Use rootvp to enforce PFS isolation when a PFS is exported via a 931 * null mount. 932 */ 933 static int 934 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 935 struct fid *fhp, struct vnode **vpp) 936 { 937 struct hammer_transaction trans; 938 struct hammer_inode *ip; 939 struct hammer_inode_info info; 940 int error; 941 u_int32_t localization; 942 943 bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id)); 944 bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof)); 945 if (rootvp) 946 localization = VTOI(rootvp)->obj_localization; 947 else 948 localization = (u_int32_t)fhp->fid_ext << 16; 949 950 hammer_simple_transaction(&trans, (void *)mp->mnt_data); 951 952 /* 953 * Get/allocate the hammer_inode structure. The structure must be 954 * unlocked while we manipulate the related vnode to avoid a 955 * deadlock. 956 */ 957 ip = hammer_get_inode(&trans, NULL, info.obj_id, 958 info.obj_asof, localization, 0, &error); 959 if (ip == NULL) { 960 *vpp = NULL; 961 return(error); 962 } 963 error = hammer_get_vnode(ip, vpp); 964 hammer_rel_inode(ip, 0); 965 hammer_done_transaction(&trans); 966 return (error); 967 } 968 969 static int 970 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 971 int *exflagsp, struct ucred **credanonp) 972 { 973 hammer_mount_t hmp = (void *)mp->mnt_data; 974 struct netcred *np; 975 int error; 976 977 np = vfs_export_lookup(mp, &hmp->export, nam); 978 if (np) { 979 *exflagsp = np->netc_exflags; 980 *credanonp = &np->netc_anon; 981 error = 0; 982 } else { 983 error = EACCES; 984 } 985 return (error); 986 987 } 988 989 int 990 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export) 991 { 992 hammer_mount_t hmp = (void *)mp->mnt_data; 993 int error; 994 995 switch(op) { 996 case MOUNTCTL_SET_EXPORT: 997 error = vfs_export(mp, &hmp->export, export); 998 break; 999 default: 1000 error = EOPNOTSUPP; 1001 break; 1002 } 1003 return(error); 1004 } 1005 1006