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 35 #include <sys/mountctl.h> 36 37 #include "hammer.h" 38 39 /* 40 * NOTE! Global statistics may not be MPSAFE so HAMMER never uses them 41 * in conditionals. 42 */ 43 int hammer_supported_version = HAMMER_VOL_VERSION_DEFAULT; 44 int hammer_debug_io; 45 int hammer_debug_general; 46 int hammer_debug_inode; 47 int hammer_debug_locks; 48 int hammer_debug_btree; 49 int hammer_debug_tid; 50 int hammer_debug_recover; /* -1 will disable, +1 will force */ 51 int hammer_debug_critical; /* non-zero enter debugger on error */ 52 int hammer_cluster_enable = 2; /* ena cluster_read, scale x 2 */ 53 int hammer_tdmux_ticks; 54 int hammer_count_fsyncs; 55 int hammer_count_inodes; 56 int hammer_count_iqueued; 57 int hammer_count_reclaims; 58 int hammer_count_records; 59 int hammer_count_record_datas; 60 int hammer_count_volumes; 61 int hammer_count_buffers; 62 int hammer_count_nodes; 63 int64_t hammer_stats_btree_lookups; 64 int64_t hammer_stats_btree_searches; 65 int64_t hammer_stats_btree_inserts; 66 int64_t hammer_stats_btree_deletes; 67 int64_t hammer_stats_btree_elements; 68 int64_t hammer_stats_btree_splits; 69 int64_t hammer_stats_btree_iterations; 70 int64_t hammer_stats_btree_root_iterations; 71 int64_t hammer_stats_record_iterations; 72 73 int64_t hammer_stats_file_read; 74 int64_t hammer_stats_file_write; 75 int64_t hammer_stats_disk_read; 76 int64_t hammer_stats_disk_write; 77 int64_t hammer_stats_inode_flushes; 78 int64_t hammer_stats_commits; 79 int64_t hammer_stats_undo; 80 int64_t hammer_stats_redo; 81 82 long hammer_count_dirtybufspace; /* global */ 83 int hammer_count_refedbufs; /* global */ 84 int hammer_count_reservations; 85 long hammer_count_io_running_read; 86 long hammer_count_io_running_write; 87 int hammer_count_io_locked; 88 long hammer_limit_dirtybufspace; /* per-mount */ 89 int hammer_limit_recs; /* as a whole XXX */ 90 int hammer_limit_inode_recs = 2048; /* per inode */ 91 int hammer_limit_reclaims; 92 int hammer_live_dedup_cache_size = 4096; 93 int hammer_limit_redo = 4096 * 1024; /* per inode */ 94 int hammer_autoflush = 500; /* auto flush (typ on reclaim) */ 95 int hammer_verify_zone; 96 int hammer_verify_data = 1; 97 int hammer_double_buffer; 98 int hammer_btree_full_undo = 1; 99 int hammer_yield_check = 16; 100 int hammer_fsync_mode = 3; 101 int64_t hammer_contention_count; 102 103 int hammer_noatime = 1; 104 TUNABLE_INT("vfs.hammer.noatime", &hammer_noatime); 105 106 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem"); 107 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD, 108 &hammer_supported_version, 0, ""); 109 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW, 110 &hammer_debug_general, 0, ""); 111 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW, 112 &hammer_debug_io, 0, ""); 113 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW, 114 &hammer_debug_inode, 0, ""); 115 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW, 116 &hammer_debug_locks, 0, ""); 117 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW, 118 &hammer_debug_btree, 0, ""); 119 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW, 120 &hammer_debug_tid, 0, ""); 121 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW, 122 &hammer_debug_recover, 0, ""); 123 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW, 124 &hammer_debug_critical, 0, ""); 125 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW, 126 &hammer_cluster_enable, 0, ""); 127 SYSCTL_INT(_vfs_hammer, OID_AUTO, tdmux_ticks, CTLFLAG_RW, 128 &hammer_tdmux_ticks, 0, "Hammer tdmux ticks"); 129 130 SYSCTL_LONG(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW, 131 &hammer_limit_dirtybufspace, 0, ""); 132 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW, 133 &hammer_limit_recs, 0, ""); 134 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW, 135 &hammer_limit_inode_recs, 0, ""); 136 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaims, CTLFLAG_RW, 137 &hammer_limit_reclaims, 0, ""); 138 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup_cache_size, CTLFLAG_RW, 139 &hammer_live_dedup_cache_size, 0, 140 "Number of cache entries"); 141 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW, 142 &hammer_limit_redo, 0, ""); 143 144 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD, 145 &hammer_count_fsyncs, 0, ""); 146 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD, 147 &hammer_count_inodes, 0, ""); 148 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD, 149 &hammer_count_iqueued, 0, ""); 150 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaims, CTLFLAG_RD, 151 &hammer_count_reclaims, 0, ""); 152 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD, 153 &hammer_count_records, 0, ""); 154 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD, 155 &hammer_count_record_datas, 0, ""); 156 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD, 157 &hammer_count_volumes, 0, ""); 158 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD, 159 &hammer_count_buffers, 0, ""); 160 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD, 161 &hammer_count_nodes, 0, ""); 162 163 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD, 164 &hammer_stats_btree_searches, 0, ""); 165 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD, 166 &hammer_stats_btree_lookups, 0, ""); 167 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD, 168 &hammer_stats_btree_inserts, 0, ""); 169 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD, 170 &hammer_stats_btree_deletes, 0, ""); 171 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD, 172 &hammer_stats_btree_elements, 0, ""); 173 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD, 174 &hammer_stats_btree_splits, 0, ""); 175 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD, 176 &hammer_stats_btree_iterations, 0, ""); 177 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD, 178 &hammer_stats_btree_root_iterations, 0, ""); 179 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD, 180 &hammer_stats_record_iterations, 0, ""); 181 182 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD, 183 &hammer_stats_file_read, 0, ""); 184 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD, 185 &hammer_stats_file_write, 0, ""); 186 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD, 187 &hammer_stats_disk_read, 0, ""); 188 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD, 189 &hammer_stats_disk_write, 0, ""); 190 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD, 191 &hammer_stats_inode_flushes, 0, ""); 192 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD, 193 &hammer_stats_commits, 0, ""); 194 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD, 195 &hammer_stats_undo, 0, ""); 196 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD, 197 &hammer_stats_redo, 0, ""); 198 199 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD, 200 &hammer_count_dirtybufspace, 0, ""); 201 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD, 202 &hammer_count_refedbufs, 0, ""); 203 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD, 204 &hammer_count_reservations, 0, ""); 205 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD, 206 &hammer_count_io_running_read, 0, ""); 207 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD, 208 &hammer_count_io_locked, 0, ""); 209 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD, 210 &hammer_count_io_running_write, 0, ""); 211 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW, 212 &hammer_contention_count, 0, ""); 213 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW, 214 &hammer_autoflush, 0, ""); 215 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW, 216 &hammer_verify_zone, 0, ""); 217 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW, 218 &hammer_verify_data, 0, ""); 219 SYSCTL_INT(_vfs_hammer, OID_AUTO, double_buffer, CTLFLAG_RW, 220 &hammer_double_buffer, 0, ""); 221 SYSCTL_INT(_vfs_hammer, OID_AUTO, btree_full_undo, CTLFLAG_RW, 222 &hammer_btree_full_undo, 0, ""); 223 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW, 224 &hammer_yield_check, 0, ""); 225 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW, 226 &hammer_fsync_mode, 0, ""); 227 228 /* KTR_INFO_MASTER(hammer); */ 229 230 /* 231 * VFS ABI 232 */ 233 static void hammer_free_hmp(struct mount *mp); 234 235 static int hammer_vfs_mount(struct mount *mp, char *path, caddr_t data, 236 struct ucred *cred); 237 static int hammer_vfs_unmount(struct mount *mp, int mntflags); 238 static int hammer_vfs_root(struct mount *mp, struct vnode **vpp); 239 static int hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, 240 struct ucred *cred); 241 static int hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, 242 struct ucred *cred); 243 static int hammer_vfs_sync(struct mount *mp, int waitfor); 244 static int hammer_vfs_vget(struct mount *mp, struct vnode *dvp, 245 ino_t ino, struct vnode **vpp); 246 static int hammer_vfs_init(struct vfsconf *conf); 247 static int hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 248 struct fid *fhp, struct vnode **vpp); 249 static int hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp); 250 static int hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 251 int *exflagsp, struct ucred **credanonp); 252 253 254 static struct vfsops hammer_vfsops = { 255 .vfs_mount = hammer_vfs_mount, 256 .vfs_unmount = hammer_vfs_unmount, 257 .vfs_root = hammer_vfs_root, 258 .vfs_statfs = hammer_vfs_statfs, 259 .vfs_statvfs = hammer_vfs_statvfs, 260 .vfs_sync = hammer_vfs_sync, 261 .vfs_vget = hammer_vfs_vget, 262 .vfs_init = hammer_vfs_init, 263 .vfs_vptofh = hammer_vfs_vptofh, 264 .vfs_fhtovp = hammer_vfs_fhtovp, 265 .vfs_checkexp = hammer_vfs_checkexp 266 }; 267 268 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", ""); 269 270 VFS_SET(hammer_vfsops, hammer, VFCF_MPSAFE); 271 MODULE_VERSION(hammer, 1); 272 273 static int 274 hammer_vfs_init(struct vfsconf *conf) 275 { 276 long n; 277 278 /* 279 * Wait up to this long for an exclusive deadlock to clear 280 * before acquiring a new shared lock on the ip. The deadlock 281 * may have occured on a b-tree node related to the ip. 282 */ 283 if (hammer_tdmux_ticks == 0) 284 hammer_tdmux_ticks = hz / 5; 285 286 /* 287 * Autosize, but be careful because a hammer filesystem's 288 * reserve is partially calculated based on dirtybufspace, 289 * so we simply cannot allow it to get too large. 290 */ 291 if (hammer_limit_recs == 0) { 292 n = nbuf * 25; 293 if (n > kmalloc_limit(M_HAMMER) / 512) 294 n = kmalloc_limit(M_HAMMER) / 512; 295 if (n > 2 * 1024 * 1024) 296 n = 2 * 1024 * 1024; 297 hammer_limit_recs = (int)n; 298 } 299 if (hammer_limit_dirtybufspace == 0) { 300 hammer_limit_dirtybufspace = hidirtybufspace / 2; 301 if (hammer_limit_dirtybufspace < 1L * 1024 * 1024) 302 hammer_limit_dirtybufspace = 1024L * 1024; 303 if (hammer_limit_dirtybufspace > 1024L * 1024 * 1024) 304 hammer_limit_dirtybufspace = 1024L * 1024 * 1024; 305 } 306 307 /* 308 * The hammer_inode structure detaches from the vnode on reclaim. 309 * This limits the number of inodes in this state to prevent a 310 * memory pool blowout. 311 */ 312 if (hammer_limit_reclaims == 0) { 313 hammer_limit_reclaims = maxvnodes / 10; 314 if (hammer_limit_reclaims > HAMMER_LIMIT_RECLAIMS) 315 hammer_limit_reclaims = HAMMER_LIMIT_RECLAIMS; 316 } 317 318 return(0); 319 } 320 321 static int 322 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data, 323 struct ucred *cred) 324 { 325 struct hammer_mount_info info; 326 hammer_mount_t hmp; 327 hammer_volume_t rootvol; 328 struct vnode *rootvp; 329 struct vnode *devvp = NULL; 330 const char *upath; /* volume name in userspace */ 331 char *path; /* volume name in system space */ 332 int error; 333 int i; 334 int master_id; 335 int nvolumes; 336 char *next_volume_ptr = NULL; 337 338 if (hammer_noatime) { 339 /* Force noatime */ 340 mp->mnt_flag |= MNT_NOATIME; 341 } 342 343 /* 344 * Accept hammer_mount_info. mntpt is NULL for root mounts at boot. 345 */ 346 if (mntpt == NULL) { 347 bzero(&info, sizeof(info)); 348 info.asof = 0; 349 info.hflags = 0; 350 info.nvolumes = 1; 351 352 next_volume_ptr = mp->mnt_stat.f_mntfromname; 353 354 /* Count number of volumes separated by ':' */ 355 for (char *p = next_volume_ptr; *p != '\0'; ++p) { 356 if (*p == ':') { 357 ++info.nvolumes; 358 } 359 } 360 361 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */ 362 } else { 363 if ((error = copyin(data, &info, sizeof(info))) != 0) 364 return (error); 365 } 366 367 /* 368 * updating or new mount 369 */ 370 if (mp->mnt_flag & MNT_UPDATE) { 371 hmp = (void *)mp->mnt_data; 372 KKASSERT(hmp != NULL); 373 } else { 374 if (info.nvolumes <= 0 || info.nvolumes > HAMMER_MAX_VOLUMES) 375 return (EINVAL); 376 hmp = NULL; 377 } 378 379 /* 380 * master-id validation. The master id may not be changed by a 381 * mount update. 382 */ 383 if (info.hflags & HMNT_MASTERID || info.hflags & HMNT_NOMIRROR) { 384 if (hmp && hmp->master_id != info.master_id) { 385 hkprintf("cannot change master id with mount update\n"); 386 return(EINVAL); 387 } 388 master_id = info.master_id; 389 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS) 390 return (EINVAL); 391 } else { 392 if (hmp) 393 master_id = hmp->master_id; 394 else 395 master_id = 0; 396 } 397 398 /* 399 * Internal mount data structure 400 */ 401 if (hmp == NULL) { 402 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO); 403 mp->mnt_data = (qaddr_t)hmp; 404 hmp->mp = mp; 405 406 /* 407 * Make sure kmalloc type limits are set appropriately. 408 * 409 * Our inode kmalloc group is sized based on maxvnodes 410 * (controlled by the system, not us). 411 */ 412 kmalloc_create(&hmp->m_misc, "HAMMER-others"); 413 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes"); 414 415 kmalloc_raise_limit(hmp->m_inodes, 0); /* unlimited */ 416 417 hmp->root_btree_beg.localization = 418 HAMMER_MIN_ONDISK_LOCALIZATION; 419 hmp->root_btree_beg.obj_id = HAMMER_MIN_OBJID; 420 hmp->root_btree_beg.key = HAMMER_MIN_KEY; 421 hmp->root_btree_beg.create_tid = 1; 422 hmp->root_btree_beg.delete_tid = 1; 423 hmp->root_btree_beg.rec_type = HAMMER_MIN_RECTYPE; 424 hmp->root_btree_beg.obj_type = 0; 425 hmp->root_btree_beg.btype = HAMMER_BTREE_TYPE_NONE; 426 427 hmp->root_btree_end.localization = 428 HAMMER_MAX_ONDISK_LOCALIZATION; 429 hmp->root_btree_end.obj_id = HAMMER_MAX_OBJID; 430 hmp->root_btree_end.key = HAMMER_MAX_KEY; 431 hmp->root_btree_end.create_tid = HAMMER_MAX_TID; 432 hmp->root_btree_end.delete_tid = 0; /* special case */ 433 hmp->root_btree_end.rec_type = HAMMER_MAX_RECTYPE; 434 hmp->root_btree_end.obj_type = 0; 435 hmp->root_btree_end.btype = HAMMER_BTREE_TYPE_NONE; 436 437 hmp->krate.freq = 1; /* maximum reporting rate (hz) */ 438 hmp->krate.count = -16; /* initial burst */ 439 hmp->kdiag.freq = 1; /* maximum reporting rate (hz) */ 440 hmp->kdiag.count = -16; /* initial burst */ 441 442 hmp->sync_lock.refs = 1; 443 hmp->undo_lock.refs = 1; 444 hmp->blkmap_lock.refs = 1; 445 hmp->snapshot_lock.refs = 1; 446 hmp->volume_lock.refs = 1; 447 448 TAILQ_INIT(&hmp->delay_list); 449 TAILQ_INIT(&hmp->flush_group_list); 450 TAILQ_INIT(&hmp->objid_cache_list); 451 TAILQ_INIT(&hmp->undo_lru_list); 452 TAILQ_INIT(&hmp->reclaim_list); 453 } 454 hmp->hflags &= ~HMNT_USERFLAGS; 455 hmp->hflags |= info.hflags & HMNT_USERFLAGS; 456 457 hmp->master_id = master_id; 458 459 if (info.asof) { 460 mp->mnt_flag |= MNT_RDONLY; 461 hmp->asof = info.asof; 462 } else { 463 hmp->asof = HAMMER_MAX_TID; 464 } 465 466 hmp->volume_to_remove = -1; 467 468 /* 469 * Re-open read-write if originally read-only, or vise-versa. 470 * 471 * When going from read-only to read-write execute the stage2 472 * recovery if it has not already been run. 473 */ 474 if (mp->mnt_flag & MNT_UPDATE) { 475 lwkt_gettoken(&hmp->fs_token); 476 error = 0; 477 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 478 hkprintf("read-only -> read-write\n"); 479 hmp->ronly = 0; 480 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 481 hammer_adjust_volume_mode, NULL); 482 rootvol = hammer_get_root_volume(hmp, &error); 483 if (rootvol) { 484 hammer_recover_flush_buffers(hmp, rootvol, 1); 485 error = hammer_recover_stage2(hmp, rootvol); 486 bcopy(rootvol->ondisk->vol0_blockmap, 487 hmp->blockmap, 488 sizeof(hmp->blockmap)); 489 hammer_rel_volume(rootvol, 0); 490 } 491 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 492 hammer_reload_inode, NULL); 493 /* kernel clears MNT_RDONLY */ 494 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 495 hkprintf("read-write -> read-only\n"); 496 hmp->ronly = 1; /* messy */ 497 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 498 hammer_reload_inode, NULL); 499 hmp->ronly = 0; 500 hammer_flusher_sync(hmp); 501 hammer_flusher_sync(hmp); 502 hammer_flusher_sync(hmp); 503 hmp->ronly = 1; 504 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 505 hammer_adjust_volume_mode, NULL); 506 } 507 lwkt_reltoken(&hmp->fs_token); 508 return(error); 509 } 510 511 RB_INIT(&hmp->rb_vols_root); 512 RB_INIT(&hmp->rb_inos_root); 513 RB_INIT(&hmp->rb_redo_root); 514 RB_INIT(&hmp->rb_nods_root); 515 RB_INIT(&hmp->rb_undo_root); 516 RB_INIT(&hmp->rb_resv_root); 517 RB_INIT(&hmp->rb_bufs_root); 518 RB_INIT(&hmp->rb_pfsm_root); 519 520 hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); 521 522 RB_INIT(&hmp->volu_root); 523 RB_INIT(&hmp->undo_root); 524 RB_INIT(&hmp->data_root); 525 RB_INIT(&hmp->meta_root); 526 RB_INIT(&hmp->lose_root); 527 TAILQ_INIT(&hmp->iorun_list); 528 529 lwkt_token_init(&hmp->fs_token, "hammerfs"); 530 lwkt_token_init(&hmp->io_token, "hammerio"); 531 532 lwkt_gettoken(&hmp->fs_token); 533 534 /* 535 * Load volumes 536 */ 537 path = objcache_get(namei_oc, M_WAITOK); 538 hmp->nvolumes = -1; 539 for (i = 0; i < info.nvolumes; ++i) { 540 if (mntpt == NULL) { 541 /* 542 * Root mount. 543 */ 544 KKASSERT(next_volume_ptr != NULL); 545 strcpy(path, ""); 546 if (*next_volume_ptr != '/') { 547 /* relative path */ 548 strcpy(path, "/dev/"); 549 } 550 int k; 551 for (k = strlen(path); k < MAXPATHLEN-1; ++k) { 552 if (*next_volume_ptr == '\0') { 553 break; 554 } else if (*next_volume_ptr == ':') { 555 ++next_volume_ptr; 556 break; 557 } else { 558 path[k] = *next_volume_ptr; 559 ++next_volume_ptr; 560 } 561 } 562 path[k] = '\0'; 563 564 error = 0; 565 cdev_t dev = kgetdiskbyname(path); 566 error = bdevvp(dev, &devvp); 567 if (error) { 568 hdkprintf("can't find devvp\n"); 569 } 570 } else { 571 error = copyin(&info.volumes[i], &upath, 572 sizeof(char *)); 573 if (error == 0) 574 error = copyinstr(upath, path, 575 MAXPATHLEN, NULL); 576 } 577 if (error == 0) 578 error = hammer_install_volume(hmp, path, devvp, NULL); 579 if (error) 580 break; 581 } 582 objcache_put(namei_oc, path); 583 584 /* 585 * Make sure we found a root volume 586 */ 587 if (hmp->rootvol == NULL) { 588 if (error == EBUSY) { 589 hdkprintf("The volumes are probably mounted\n"); 590 } else { 591 hdkprintf("No root volume found!\n"); 592 error = EINVAL; 593 } 594 goto failed; 595 } 596 597 /* 598 * Check that all required volumes are available 599 */ 600 if (error == 0 && hammer_mountcheck_volumes(hmp)) { 601 hdkprintf("Missing volumes, cannot mount!\n"); 602 error = EINVAL; 603 goto failed; 604 } 605 606 /* 607 * Other errors 608 */ 609 if (error) { 610 hdkprintf("Failed to load volumes!\n"); 611 goto failed; 612 } 613 614 nvolumes = hammer_get_installed_volumes(hmp); 615 if (hmp->nvolumes != nvolumes) { 616 hdkprintf("volume header says %d volumes, but %d installed\n", 617 hmp->nvolumes, nvolumes); 618 error = EINVAL; 619 goto failed; 620 } 621 622 /* 623 * No errors, setup enough of the mount point so we can lookup the 624 * root vnode. 625 */ 626 mp->mnt_iosize_max = MAXPHYS; 627 mp->mnt_kern_flag |= MNTK_FSMID; 628 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */ 629 630 /* 631 * MPSAFE code. Note that VOPs and VFSops which are not MPSAFE 632 * will acquire a per-mount token prior to entry and release it 633 * on return. 634 */ 635 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; 636 637 /* 638 * note: f_iosize is used by vnode_pager_haspage() when constructing 639 * its VOP_BMAP call. 640 */ 641 mp->mnt_stat.f_iosize = HAMMER_BUFSIZE; 642 mp->mnt_stat.f_bsize = HAMMER_BUFSIZE; 643 644 mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE; 645 mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE; 646 647 mp->mnt_maxsymlinklen = 255; 648 mp->mnt_flag |= MNT_LOCAL; 649 650 vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops); 651 vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops); 652 vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops); 653 654 /* 655 * The root volume's ondisk pointer is only valid if we hold a 656 * reference to it. 657 */ 658 rootvol = hammer_get_root_volume(hmp, &error); 659 if (error) 660 goto failed; 661 662 /* 663 * Perform any necessary UNDO operations. The recovery code does 664 * call hammer_undo_lookup() so we have to pre-cache the blockmap, 665 * and then re-copy it again after recovery is complete. 666 * 667 * If this is a read-only mount the UNDO information is retained 668 * in memory in the form of dirty buffer cache buffers, and not 669 * written back to the media. 670 */ 671 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, 672 sizeof(hmp->blockmap)); 673 674 /* 675 * Check filesystem version 676 */ 677 hmp->version = rootvol->ondisk->vol_version; 678 if (hmp->version < HAMMER_VOL_VERSION_MIN || 679 hmp->version > HAMMER_VOL_VERSION_MAX) { 680 hkprintf("mount unsupported fs version %d\n", hmp->version); 681 error = ERANGE; 682 goto done; 683 } 684 685 /* 686 * The undo_rec_limit limits the size of flush groups to avoid 687 * blowing out the UNDO FIFO. This calculation is typically in 688 * the tens of thousands and is designed primarily when small 689 * HAMMER filesystems are created. 690 */ 691 hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100; 692 if (hammer_debug_general & 0x0001) 693 hkprintf("undo_rec_limit %d\n", hmp->undo_rec_limit); 694 695 /* 696 * NOTE: Recover stage1 not only handles meta-data recovery, it 697 * also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems. 698 */ 699 error = hammer_recover_stage1(hmp, rootvol); 700 if (error) { 701 kprintf("Failed to recover HAMMER filesystem on mount\n"); 702 goto done; 703 } 704 705 /* 706 * Finish setup now that we have a good root volume. 707 */ 708 ksnprintf(mp->mnt_stat.f_mntfromname, 709 sizeof(mp->mnt_stat.f_mntfromname), "%s", 710 rootvol->ondisk->vol_label); 711 mp->mnt_stat.f_fsid.val[0] = 712 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8); 713 mp->mnt_stat.f_fsid.val[1] = 714 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8); 715 mp->mnt_stat.f_fsid.val[1] &= HAMMER_LOCALIZE_MASK; 716 717 mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid; 718 mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid, 719 sizeof(mp->mnt_vstat.f_fsid_uuid)); 720 721 /* 722 * Certain often-modified fields in the root volume are cached in 723 * the hammer_mount structure so we do not have to generate lots 724 * of little UNDO structures for them. 725 * 726 * Recopy after recovery. This also has the side effect of 727 * setting our cached undo FIFO's first_offset, which serves to 728 * placemark the FIFO start for the NEXT flush cycle while the 729 * on-disk first_offset represents the LAST flush cycle. 730 */ 731 hmp->next_tid = rootvol->ondisk->vol0_next_tid; 732 hmp->flush_tid1 = hmp->next_tid; 733 hmp->flush_tid2 = hmp->next_tid; 734 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, 735 sizeof(hmp->blockmap)); 736 hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks; 737 738 hammer_flusher_create(hmp); 739 740 /* 741 * Locate the root directory with an obj_id of 1. 742 */ 743 error = hammer_vfs_root(mp, &rootvp); 744 if (error) 745 goto done; 746 vput(rootvp); 747 if (hmp->ronly == 0) 748 error = hammer_recover_stage2(hmp, rootvol); 749 750 /* 751 * If the stage2 recovery fails be sure to clean out all cached 752 * vnodes before throwing away the mount structure or bad things 753 * will happen. 754 */ 755 if (error) 756 vflush(mp, 0, 0); 757 758 done: 759 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 760 /* New mount */ 761 762 /* Populate info for mount point (NULL pad)*/ 763 bzero(mp->mnt_stat.f_mntonname, MNAMELEN); 764 size_t size; 765 if (mntpt) { 766 copyinstr(mntpt, mp->mnt_stat.f_mntonname, 767 MNAMELEN -1, &size); 768 } else { /* Root mount */ 769 mp->mnt_stat.f_mntonname[0] = '/'; 770 } 771 } 772 (void)VFS_STATFS(mp, &mp->mnt_stat, cred); 773 hammer_rel_volume(rootvol, 0); 774 failed: 775 /* 776 * Cleanup and return. 777 */ 778 if (error) { 779 /* called with fs_token held */ 780 hammer_free_hmp(mp); 781 } else { 782 lwkt_reltoken(&hmp->fs_token); 783 } 784 return (error); 785 } 786 787 static int 788 hammer_vfs_unmount(struct mount *mp, int mntflags) 789 { 790 hammer_mount_t hmp = (void *)mp->mnt_data; 791 int flags; 792 int error; 793 794 /* 795 * Clean out the vnodes 796 */ 797 lwkt_gettoken(&hmp->fs_token); 798 flags = 0; 799 if (mntflags & MNT_FORCE) 800 flags |= FORCECLOSE; 801 error = vflush(mp, 0, flags); 802 803 /* 804 * Clean up the internal mount structure and related entities. This 805 * may issue I/O. 806 */ 807 if (error == 0) { 808 /* called with fs_token held */ 809 hammer_free_hmp(mp); 810 } else { 811 lwkt_reltoken(&hmp->fs_token); 812 } 813 return(error); 814 } 815 816 /* 817 * Clean up the internal mount structure and disassociate it from the mount. 818 * This may issue I/O. 819 * 820 * Called with fs_token held. 821 */ 822 static void 823 hammer_free_hmp(struct mount *mp) 824 { 825 hammer_mount_t hmp = (void *)mp->mnt_data; 826 hammer_flush_group_t flg; 827 828 /* 829 * Flush anything dirty. This won't even run if the 830 * filesystem errored-out. 831 */ 832 hammer_flush_dirty(hmp, 30); 833 834 /* 835 * If the mount had a critical error we have to destroy any 836 * remaining inodes before we can finish cleaning up the flusher. 837 */ 838 if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) { 839 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 840 hammer_destroy_inode_callback, NULL); 841 } 842 843 /* 844 * There shouldn't be any inodes left now and any left over 845 * flush groups should now be empty. 846 */ 847 KKASSERT(RB_EMPTY(&hmp->rb_inos_root)); 848 while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) { 849 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry); 850 KKASSERT(RB_EMPTY(&flg->flush_tree)); 851 if (flg->refs) { 852 hkprintf("Warning, flush_group %p was " 853 "not empty on umount!\n", flg); 854 } 855 kfree(flg, hmp->m_misc); 856 } 857 858 /* 859 * We can finally destroy the flusher 860 */ 861 hammer_flusher_destroy(hmp); 862 863 /* 864 * We may have held recovered buffers due to a read-only mount. 865 * These must be discarded. 866 */ 867 if (hmp->ronly) 868 hammer_recover_flush_buffers(hmp, NULL, -1); 869 870 /* 871 * Unload buffers and then volumes 872 */ 873 RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL, 874 hammer_unload_buffer, NULL); 875 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 876 hammer_unload_volume, NULL); 877 878 mp->mnt_data = NULL; 879 mp->mnt_flag &= ~MNT_LOCAL; 880 hmp->mp = NULL; 881 hammer_destroy_objid_cache(hmp); 882 kmalloc_destroy(&hmp->m_misc); 883 kmalloc_destroy(&hmp->m_inodes); 884 lwkt_reltoken(&hmp->fs_token); 885 kfree(hmp, M_HAMMER); 886 } 887 888 /* 889 * Report critical errors. ip may be NULL. 890 */ 891 void 892 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip, 893 int error, const char *msg) 894 { 895 hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR; 896 897 hmkrateprintf(&hmp->krate, hmp, 898 "Critical error inode=%jd error=%d %s\n", 899 (intmax_t)(ip ? ip->obj_id : -1), 900 error, msg); 901 902 if (hmp->ronly == 0) { 903 hmp->ronly = 2; /* special errored read-only mode */ 904 hmp->mp->mnt_flag |= MNT_RDONLY; 905 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 906 hammer_adjust_volume_mode, NULL); 907 hmkprintf(hmp, "Forcing read-only mode\n"); 908 } 909 hmp->error = error; 910 if (hammer_debug_critical) 911 Debugger("Entering debugger"); 912 } 913 914 915 /* 916 * Obtain a vnode for the specified inode number. An exclusively locked 917 * vnode is returned. 918 */ 919 int 920 hammer_vfs_vget(struct mount *mp, struct vnode *dvp, 921 ino_t ino, struct vnode **vpp) 922 { 923 struct hammer_transaction trans; 924 hammer_mount_t hmp = (void *)mp->mnt_data; 925 hammer_inode_t ip; 926 int error; 927 uint32_t localization; 928 929 lwkt_gettoken(&hmp->fs_token); 930 hammer_simple_transaction(&trans, hmp); 931 932 /* 933 * If a directory vnode is supplied (mainly NFS) then we can acquire 934 * the PFS domain from it. Otherwise we would only be able to vget 935 * inodes in the root PFS. 936 */ 937 if (dvp) { 938 localization = HAMMER_DEF_LOCALIZATION | 939 VTOI(dvp)->obj_localization; 940 } else { 941 localization = HAMMER_DEF_LOCALIZATION; 942 } 943 944 /* 945 * Lookup the requested HAMMER inode. The structure must be 946 * left unlocked while we manipulate the related vnode to avoid 947 * a deadlock. 948 */ 949 ip = hammer_get_inode(&trans, NULL, ino, 950 hmp->asof, localization, 951 0, &error); 952 if (ip == NULL) { 953 *vpp = NULL; 954 } else { 955 error = hammer_get_vnode(ip, vpp); 956 hammer_rel_inode(ip, 0); 957 } 958 hammer_done_transaction(&trans); 959 lwkt_reltoken(&hmp->fs_token); 960 return (error); 961 } 962 963 /* 964 * Return the root vnode for the filesystem. 965 * 966 * HAMMER stores the root vnode in the hammer_mount structure so 967 * getting it is easy. 968 */ 969 static int 970 hammer_vfs_root(struct mount *mp, struct vnode **vpp) 971 { 972 int error; 973 974 error = hammer_vfs_vget(mp, NULL, HAMMER_OBJID_ROOT, vpp); 975 return (error); 976 } 977 978 static int 979 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 980 { 981 hammer_mount_t hmp = (void *)mp->mnt_data; 982 hammer_volume_t volume; 983 hammer_volume_ondisk_t ondisk; 984 int error; 985 int64_t bfree; 986 int64_t breserved; 987 988 lwkt_gettoken(&hmp->fs_token); 989 volume = hammer_get_root_volume(hmp, &error); 990 if (error) { 991 lwkt_reltoken(&hmp->fs_token); 992 return(error); 993 } 994 ondisk = volume->ondisk; 995 996 /* 997 * Basic stats 998 */ 999 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved); 1000 mp->mnt_stat.f_files = ondisk->vol0_stat_inodes; 1001 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_BIGBLOCK_SIZE; 1002 hammer_rel_volume(volume, 0); 1003 1004 if (breserved > bfree) 1005 breserved = bfree; 1006 mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE; 1007 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree; 1008 if (mp->mnt_stat.f_files < 0) 1009 mp->mnt_stat.f_files = 0; 1010 1011 *sbp = mp->mnt_stat; 1012 lwkt_reltoken(&hmp->fs_token); 1013 return(0); 1014 } 1015 1016 static int 1017 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 1018 { 1019 hammer_mount_t hmp = (void *)mp->mnt_data; 1020 hammer_volume_t volume; 1021 hammer_volume_ondisk_t ondisk; 1022 int error; 1023 int64_t bfree; 1024 int64_t breserved; 1025 1026 lwkt_gettoken(&hmp->fs_token); 1027 volume = hammer_get_root_volume(hmp, &error); 1028 if (error) { 1029 lwkt_reltoken(&hmp->fs_token); 1030 return(error); 1031 } 1032 ondisk = volume->ondisk; 1033 1034 /* 1035 * Basic stats 1036 */ 1037 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved); 1038 mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes; 1039 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_BIGBLOCK_SIZE; 1040 hammer_rel_volume(volume, 0); 1041 1042 if (breserved > bfree) 1043 breserved = bfree; 1044 mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE; 1045 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree; 1046 if (mp->mnt_vstat.f_files < 0) 1047 mp->mnt_vstat.f_files = 0; 1048 *sbp = mp->mnt_vstat; 1049 lwkt_reltoken(&hmp->fs_token); 1050 return(0); 1051 } 1052 1053 /* 1054 * Sync the filesystem. Currently we have to run it twice, the second 1055 * one will advance the undo start index to the end index, so if a crash 1056 * occurs no undos will be run on mount. 1057 * 1058 * We do not sync the filesystem if we are called from a panic. If we did 1059 * we might end up blowing up a sync that was already in progress. 1060 */ 1061 static int 1062 hammer_vfs_sync(struct mount *mp, int waitfor) 1063 { 1064 hammer_mount_t hmp = (void *)mp->mnt_data; 1065 int error; 1066 1067 lwkt_gettoken(&hmp->fs_token); 1068 if (panicstr == NULL) { 1069 error = hammer_sync_hmp(hmp, waitfor); 1070 } else { 1071 error = EIO; 1072 } 1073 lwkt_reltoken(&hmp->fs_token); 1074 return (error); 1075 } 1076 1077 /* 1078 * Convert a vnode to a file handle. 1079 * 1080 * Accesses read-only fields on already-referenced structures so 1081 * no token is needed. 1082 */ 1083 static int 1084 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp) 1085 { 1086 hammer_inode_t ip; 1087 1088 KKASSERT(MAXFIDSZ >= 16); 1089 ip = VTOI(vp); 1090 fhp->fid_len = offsetof(struct fid, fid_data[16]); 1091 fhp->fid_ext = lo_to_pfs(ip->obj_localization); 1092 bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id)); 1093 bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof)); 1094 return(0); 1095 } 1096 1097 1098 /* 1099 * Convert a file handle back to a vnode. 1100 * 1101 * Use rootvp to enforce PFS isolation when a PFS is exported via a 1102 * null mount. 1103 */ 1104 static int 1105 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 1106 struct fid *fhp, struct vnode **vpp) 1107 { 1108 hammer_mount_t hmp = (void *)mp->mnt_data; 1109 struct hammer_transaction trans; 1110 hammer_inode_t ip; 1111 struct hammer_inode_info info; 1112 int error; 1113 uint32_t localization; 1114 1115 bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id)); 1116 bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof)); 1117 if (rootvp) 1118 localization = VTOI(rootvp)->obj_localization; 1119 else 1120 localization = pfs_to_lo(fhp->fid_ext); 1121 1122 lwkt_gettoken(&hmp->fs_token); 1123 hammer_simple_transaction(&trans, hmp); 1124 1125 /* 1126 * Get/allocate the hammer_inode structure. The structure must be 1127 * unlocked while we manipulate the related vnode to avoid a 1128 * deadlock. 1129 */ 1130 ip = hammer_get_inode(&trans, NULL, info.obj_id, 1131 info.obj_asof, localization, 0, &error); 1132 if (ip) { 1133 error = hammer_get_vnode(ip, vpp); 1134 hammer_rel_inode(ip, 0); 1135 } else { 1136 *vpp = NULL; 1137 } 1138 hammer_done_transaction(&trans); 1139 lwkt_reltoken(&hmp->fs_token); 1140 return (error); 1141 } 1142 1143 static int 1144 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 1145 int *exflagsp, struct ucred **credanonp) 1146 { 1147 hammer_mount_t hmp = (void *)mp->mnt_data; 1148 struct netcred *np; 1149 int error; 1150 1151 lwkt_gettoken(&hmp->fs_token); 1152 np = vfs_export_lookup(mp, &hmp->export, nam); 1153 if (np) { 1154 *exflagsp = np->netc_exflags; 1155 *credanonp = &np->netc_anon; 1156 error = 0; 1157 } else { 1158 error = EACCES; 1159 } 1160 lwkt_reltoken(&hmp->fs_token); 1161 return (error); 1162 1163 } 1164 1165 int 1166 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export) 1167 { 1168 hammer_mount_t hmp = (void *)mp->mnt_data; 1169 int error; 1170 1171 lwkt_gettoken(&hmp->fs_token); 1172 1173 switch(op) { 1174 case MOUNTCTL_SET_EXPORT: 1175 error = vfs_export(mp, &hmp->export, export); 1176 break; 1177 default: 1178 error = EOPNOTSUPP; 1179 break; 1180 } 1181 lwkt_reltoken(&hmp->fs_token); 1182 1183 return(error); 1184 } 1185 1186