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_live_dedup = 0; 67 int hammer_count_fsyncs; 68 int hammer_count_inodes; 69 int hammer_count_iqueued; 70 int hammer_count_reclaiming; 71 int hammer_count_records; 72 int hammer_count_record_datas; 73 int hammer_count_volumes; 74 int hammer_count_buffers; 75 int hammer_count_nodes; 76 int64_t hammer_count_extra_space_used; 77 int64_t hammer_stats_btree_lookups; 78 int64_t hammer_stats_btree_searches; 79 int64_t hammer_stats_btree_inserts; 80 int64_t hammer_stats_btree_deletes; 81 int64_t hammer_stats_btree_elements; 82 int64_t hammer_stats_btree_splits; 83 int64_t hammer_stats_btree_iterations; 84 int64_t hammer_stats_btree_root_iterations; 85 int64_t hammer_stats_record_iterations; 86 87 int64_t hammer_stats_file_read; 88 int64_t hammer_stats_file_write; 89 int64_t hammer_stats_file_iopsr; 90 int64_t hammer_stats_file_iopsw; 91 int64_t hammer_stats_disk_read; 92 int64_t hammer_stats_disk_write; 93 int64_t hammer_stats_inode_flushes; 94 int64_t hammer_stats_commits; 95 int64_t hammer_stats_undo; 96 int64_t hammer_stats_redo; 97 98 int hammer_count_dirtybufspace; /* global */ 99 int hammer_count_refedbufs; /* global */ 100 int hammer_count_reservations; 101 int hammer_count_io_running_read; 102 int hammer_count_io_running_write; 103 int hammer_count_io_locked; 104 int hammer_limit_dirtybufspace; /* per-mount */ 105 int hammer_limit_running_io; /* per-mount */ 106 int hammer_limit_recs; /* as a whole XXX */ 107 int hammer_limit_inode_recs = 1024; /* per inode */ 108 int hammer_limit_reclaim; 109 int hammer_live_dedup_cache_size = DEDUP_CACHE_SIZE; 110 int hammer_limit_redo = 4096 * 1024; /* per inode */ 111 int hammer_autoflush = 500; /* auto flush (typ on reclaim) */ 112 int hammer_bio_count; 113 int hammer_verify_zone; 114 int hammer_verify_data = 1; 115 int hammer_write_mode; 116 int hammer_yield_check = 16; 117 int hammer_fsync_mode = 3; 118 int64_t hammer_contention_count; 119 int64_t hammer_zone_limit; 120 121 /* 122 * Live dedup debug counters (sysctls are writable so that counters 123 * can be reset from userspace). 124 */ 125 int64_t hammer_live_dedup_vnode_bcmps = 0; 126 int64_t hammer_live_dedup_device_bcmps = 0; 127 int64_t hammer_live_dedup_findblk_failures = 0; 128 int64_t hammer_live_dedup_bmap_saves = 0; 129 130 131 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem"); 132 133 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD, 134 &hammer_supported_version, 0, ""); 135 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW, 136 &hammer_debug_general, 0, ""); 137 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW, 138 &hammer_debug_io, 0, ""); 139 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW, 140 &hammer_debug_debug, 0, ""); 141 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW, 142 &hammer_debug_inode, 0, ""); 143 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW, 144 &hammer_debug_locks, 0, ""); 145 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW, 146 &hammer_debug_btree, 0, ""); 147 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW, 148 &hammer_debug_tid, 0, ""); 149 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW, 150 &hammer_debug_recover, 0, ""); 151 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW, 152 &hammer_debug_recover_faults, 0, ""); 153 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW, 154 &hammer_debug_critical, 0, ""); 155 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW, 156 &hammer_cluster_enable, 0, ""); 157 /* 158 * 0 - live dedup is disabled 159 * 1 - dedup cache is populated on reads only 160 * 2 - dedup cache is populated on both reads and writes 161 */ 162 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup, CTLFLAG_RW, 163 &hammer_live_dedup, 0, "Enable live dedup"); 164 165 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW, 166 &hammer_limit_dirtybufspace, 0, ""); 167 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_running_io, CTLFLAG_RW, 168 &hammer_limit_running_io, 0, ""); 169 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW, 170 &hammer_limit_recs, 0, ""); 171 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW, 172 &hammer_limit_inode_recs, 0, ""); 173 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaim, CTLFLAG_RW, 174 &hammer_limit_reclaim, 0, ""); 175 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup_cache_size, CTLFLAG_RW, 176 &hammer_live_dedup_cache_size, 0, 177 "Number of cache entries"); 178 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW, 179 &hammer_limit_redo, 0, ""); 180 181 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD, 182 &hammer_count_fsyncs, 0, ""); 183 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD, 184 &hammer_count_inodes, 0, ""); 185 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD, 186 &hammer_count_iqueued, 0, ""); 187 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD, 188 &hammer_count_reclaiming, 0, ""); 189 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD, 190 &hammer_count_records, 0, ""); 191 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD, 192 &hammer_count_record_datas, 0, ""); 193 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD, 194 &hammer_count_volumes, 0, ""); 195 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD, 196 &hammer_count_buffers, 0, ""); 197 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD, 198 &hammer_count_nodes, 0, ""); 199 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD, 200 &hammer_count_extra_space_used, 0, ""); 201 202 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD, 203 &hammer_stats_btree_searches, 0, ""); 204 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD, 205 &hammer_stats_btree_lookups, 0, ""); 206 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD, 207 &hammer_stats_btree_inserts, 0, ""); 208 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD, 209 &hammer_stats_btree_deletes, 0, ""); 210 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD, 211 &hammer_stats_btree_elements, 0, ""); 212 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD, 213 &hammer_stats_btree_splits, 0, ""); 214 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD, 215 &hammer_stats_btree_iterations, 0, ""); 216 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD, 217 &hammer_stats_btree_root_iterations, 0, ""); 218 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD, 219 &hammer_stats_record_iterations, 0, ""); 220 221 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD, 222 &hammer_stats_file_read, 0, ""); 223 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD, 224 &hammer_stats_file_write, 0, ""); 225 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD, 226 &hammer_stats_file_iopsr, 0, ""); 227 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD, 228 &hammer_stats_file_iopsw, 0, ""); 229 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD, 230 &hammer_stats_disk_read, 0, ""); 231 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD, 232 &hammer_stats_disk_write, 0, ""); 233 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD, 234 &hammer_stats_inode_flushes, 0, ""); 235 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD, 236 &hammer_stats_commits, 0, ""); 237 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD, 238 &hammer_stats_undo, 0, ""); 239 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD, 240 &hammer_stats_redo, 0, ""); 241 242 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_vnode_bcmps, CTLFLAG_RW, 243 &hammer_live_dedup_vnode_bcmps, 0, 244 "successful vnode buffer comparisons"); 245 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_device_bcmps, CTLFLAG_RW, 246 &hammer_live_dedup_device_bcmps, 0, 247 "successful device buffer comparisons"); 248 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_findblk_failures, CTLFLAG_RW, 249 &hammer_live_dedup_findblk_failures, 0, 250 "block lookup failures for comparison"); 251 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_bmap_saves, CTLFLAG_RW, 252 &hammer_live_dedup_bmap_saves, 0, 253 "useful physical block lookups"); 254 255 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD, 256 &hammer_count_dirtybufspace, 0, ""); 257 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD, 258 &hammer_count_refedbufs, 0, ""); 259 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD, 260 &hammer_count_reservations, 0, ""); 261 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD, 262 &hammer_count_io_running_read, 0, ""); 263 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD, 264 &hammer_count_io_locked, 0, ""); 265 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD, 266 &hammer_count_io_running_write, 0, ""); 267 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW, 268 &hammer_zone_limit, 0, ""); 269 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW, 270 &hammer_contention_count, 0, ""); 271 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW, 272 &hammer_autoflush, 0, ""); 273 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW, 274 &hammer_verify_zone, 0, ""); 275 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW, 276 &hammer_verify_data, 0, ""); 277 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW, 278 &hammer_write_mode, 0, ""); 279 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW, 280 &hammer_yield_check, 0, ""); 281 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW, 282 &hammer_fsync_mode, 0, ""); 283 284 KTR_INFO_MASTER(hammer); 285 286 /* 287 * VFS ABI 288 */ 289 static void hammer_free_hmp(struct mount *mp); 290 291 static int hammer_vfs_mount(struct mount *mp, char *path, caddr_t data, 292 struct ucred *cred); 293 static int hammer_vfs_unmount(struct mount *mp, int mntflags); 294 static int hammer_vfs_root(struct mount *mp, struct vnode **vpp); 295 static int hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, 296 struct ucred *cred); 297 static int hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, 298 struct ucred *cred); 299 static int hammer_vfs_sync(struct mount *mp, int waitfor); 300 static int hammer_vfs_vget(struct mount *mp, struct vnode *dvp, 301 ino_t ino, struct vnode **vpp); 302 static int hammer_vfs_init(struct vfsconf *conf); 303 static int hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 304 struct fid *fhp, struct vnode **vpp); 305 static int hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp); 306 static int hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 307 int *exflagsp, struct ucred **credanonp); 308 309 310 static struct vfsops hammer_vfsops = { 311 .vfs_mount = hammer_vfs_mount, 312 .vfs_unmount = hammer_vfs_unmount, 313 .vfs_root = hammer_vfs_root, 314 .vfs_statfs = hammer_vfs_statfs, 315 .vfs_statvfs = hammer_vfs_statvfs, 316 .vfs_sync = hammer_vfs_sync, 317 .vfs_vget = hammer_vfs_vget, 318 .vfs_init = hammer_vfs_init, 319 .vfs_vptofh = hammer_vfs_vptofh, 320 .vfs_fhtovp = hammer_vfs_fhtovp, 321 .vfs_checkexp = hammer_vfs_checkexp 322 }; 323 324 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", ""); 325 326 VFS_SET(hammer_vfsops, hammer, 0); 327 MODULE_VERSION(hammer, 1); 328 329 static int 330 hammer_vfs_init(struct vfsconf *conf) 331 { 332 int n; 333 334 if (hammer_limit_recs == 0) { 335 hammer_limit_recs = nbuf * 25; 336 n = kmalloc_limit(M_HAMMER) / 512; 337 if (hammer_limit_recs > n) 338 hammer_limit_recs = n; 339 } 340 if (hammer_limit_dirtybufspace == 0) { 341 hammer_limit_dirtybufspace = hidirtybufspace / 2; 342 if (hammer_limit_dirtybufspace < 100) 343 hammer_limit_dirtybufspace = 100; 344 } 345 346 /* 347 * Set reasonable limits to maintain an I/O pipeline. This is 348 * used by the flush code which explicitly initiates I/O, and 349 * is per-mount. 350 * 351 * The system-driven buffer cache uses vfs.lorunningspace and 352 * vfs.hirunningspace globally. 353 */ 354 if (hammer_limit_running_io == 0) 355 hammer_limit_running_io = hammer_limit_dirtybufspace; 356 if (hammer_limit_running_io > 10 * 1024 * 1024) 357 hammer_limit_running_io = 10 * 1024 * 1024; 358 359 /* 360 * The hammer_inode structure detaches from the vnode on reclaim. 361 * This limits the number of inodes in this state to prevent a 362 * memory pool blowout. 363 */ 364 if (hammer_limit_reclaim == 0) 365 hammer_limit_reclaim = desiredvnodes / 10; 366 367 return(0); 368 } 369 370 static int 371 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data, 372 struct ucred *cred) 373 { 374 struct hammer_mount_info info; 375 hammer_mount_t hmp; 376 hammer_volume_t rootvol; 377 struct vnode *rootvp; 378 struct vnode *devvp = NULL; 379 const char *upath; /* volume name in userspace */ 380 char *path; /* volume name in system space */ 381 int error; 382 int i; 383 int master_id; 384 char *next_volume_ptr = NULL; 385 386 /* 387 * Accept hammer_mount_info. mntpt is NULL for root mounts at boot. 388 */ 389 if (mntpt == NULL) { 390 bzero(&info, sizeof(info)); 391 info.asof = 0; 392 info.hflags = 0; 393 info.nvolumes = 1; 394 395 next_volume_ptr = mp->mnt_stat.f_mntfromname; 396 397 /* Count number of volumes separated by ':' */ 398 for (char *p = next_volume_ptr; *p != '\0'; ++p) { 399 if (*p == ':') { 400 ++info.nvolumes; 401 } 402 } 403 404 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */ 405 } else { 406 if ((error = copyin(data, &info, sizeof(info))) != 0) 407 return (error); 408 } 409 410 /* 411 * updating or new mount 412 */ 413 if (mp->mnt_flag & MNT_UPDATE) { 414 hmp = (void *)mp->mnt_data; 415 KKASSERT(hmp != NULL); 416 } else { 417 if (info.nvolumes <= 0 || info.nvolumes >= 32768) 418 return (EINVAL); 419 hmp = NULL; 420 } 421 422 /* 423 * master-id validation. The master id may not be changed by a 424 * mount update. 425 */ 426 if (info.hflags & HMNT_MASTERID) { 427 if (hmp && hmp->master_id != info.master_id) { 428 kprintf("hammer: cannot change master id " 429 "with mount update\n"); 430 return(EINVAL); 431 } 432 master_id = info.master_id; 433 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS) 434 return (EINVAL); 435 } else { 436 if (hmp) 437 master_id = hmp->master_id; 438 else 439 master_id = 0; 440 } 441 442 /* 443 * Internal mount data structure 444 */ 445 if (hmp == NULL) { 446 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO); 447 mp->mnt_data = (qaddr_t)hmp; 448 hmp->mp = mp; 449 /*TAILQ_INIT(&hmp->recycle_list);*/ 450 451 /* 452 * Make sure kmalloc type limits are set appropriately. 453 * 454 * Our inode kmalloc group is sized based on maxvnodes 455 * (controlled by the system, not us). 456 */ 457 kmalloc_create(&hmp->m_misc, "HAMMER-others"); 458 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes"); 459 460 kmalloc_raise_limit(hmp->m_inodes, 0); /* unlimited */ 461 462 hmp->root_btree_beg.localization = 0x00000000U; 463 hmp->root_btree_beg.obj_id = -0x8000000000000000LL; 464 hmp->root_btree_beg.key = -0x8000000000000000LL; 465 hmp->root_btree_beg.create_tid = 1; 466 hmp->root_btree_beg.delete_tid = 1; 467 hmp->root_btree_beg.rec_type = 0; 468 hmp->root_btree_beg.obj_type = 0; 469 470 hmp->root_btree_end.localization = 0xFFFFFFFFU; 471 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL; 472 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL; 473 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL; 474 hmp->root_btree_end.delete_tid = 0; /* special case */ 475 hmp->root_btree_end.rec_type = 0xFFFFU; 476 hmp->root_btree_end.obj_type = 0; 477 478 hmp->krate.freq = 1; /* maximum reporting rate (hz) */ 479 hmp->krate.count = -16; /* initial burst */ 480 481 hmp->sync_lock.refs = 1; 482 hmp->free_lock.refs = 1; 483 hmp->undo_lock.refs = 1; 484 hmp->blkmap_lock.refs = 1; 485 hmp->snapshot_lock.refs = 1; 486 hmp->volume_lock.refs = 1; 487 488 TAILQ_INIT(&hmp->delay_list); 489 TAILQ_INIT(&hmp->flush_group_list); 490 TAILQ_INIT(&hmp->objid_cache_list); 491 TAILQ_INIT(&hmp->undo_lru_list); 492 TAILQ_INIT(&hmp->reclaim_list); 493 494 RB_INIT(&hmp->rb_dedup_crc_root); 495 RB_INIT(&hmp->rb_dedup_off_root); 496 TAILQ_INIT(&hmp->dedup_lru_list); 497 } 498 hmp->hflags &= ~HMNT_USERFLAGS; 499 hmp->hflags |= info.hflags & HMNT_USERFLAGS; 500 501 hmp->master_id = master_id; 502 503 if (info.asof) { 504 mp->mnt_flag |= MNT_RDONLY; 505 hmp->asof = info.asof; 506 } else { 507 hmp->asof = HAMMER_MAX_TID; 508 } 509 510 hmp->volume_to_remove = -1; 511 512 /* 513 * Re-open read-write if originally read-only, or vise-versa. 514 * 515 * When going from read-only to read-write execute the stage2 516 * recovery if it has not already been run. 517 */ 518 if (mp->mnt_flag & MNT_UPDATE) { 519 lwkt_gettoken(&hmp->fs_token); 520 error = 0; 521 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 522 kprintf("HAMMER read-only -> read-write\n"); 523 hmp->ronly = 0; 524 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 525 hammer_adjust_volume_mode, NULL); 526 rootvol = hammer_get_root_volume(hmp, &error); 527 if (rootvol) { 528 hammer_recover_flush_buffers(hmp, rootvol, 1); 529 error = hammer_recover_stage2(hmp, rootvol); 530 bcopy(rootvol->ondisk->vol0_blockmap, 531 hmp->blockmap, 532 sizeof(hmp->blockmap)); 533 hammer_rel_volume(rootvol, 0); 534 } 535 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 536 hammer_reload_inode, NULL); 537 /* kernel clears MNT_RDONLY */ 538 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 539 kprintf("HAMMER read-write -> read-only\n"); 540 hmp->ronly = 1; /* messy */ 541 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 542 hammer_reload_inode, NULL); 543 hmp->ronly = 0; 544 hammer_flusher_sync(hmp); 545 hammer_flusher_sync(hmp); 546 hammer_flusher_sync(hmp); 547 hmp->ronly = 1; 548 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 549 hammer_adjust_volume_mode, NULL); 550 } 551 lwkt_reltoken(&hmp->fs_token); 552 return(error); 553 } 554 555 RB_INIT(&hmp->rb_vols_root); 556 RB_INIT(&hmp->rb_inos_root); 557 RB_INIT(&hmp->rb_redo_root); 558 RB_INIT(&hmp->rb_nods_root); 559 RB_INIT(&hmp->rb_undo_root); 560 RB_INIT(&hmp->rb_resv_root); 561 RB_INIT(&hmp->rb_bufs_root); 562 RB_INIT(&hmp->rb_pfsm_root); 563 564 hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); 565 566 RB_INIT(&hmp->volu_root); 567 RB_INIT(&hmp->undo_root); 568 RB_INIT(&hmp->data_root); 569 RB_INIT(&hmp->meta_root); 570 RB_INIT(&hmp->lose_root); 571 TAILQ_INIT(&hmp->iorun_list); 572 573 lwkt_token_init(&hmp->fs_token, 1, "hammerfs"); 574 lwkt_token_init(&hmp->io_token, 1, "hammerio"); 575 576 lwkt_gettoken(&hmp->fs_token); 577 578 /* 579 * Load volumes 580 */ 581 path = objcache_get(namei_oc, M_WAITOK); 582 hmp->nvolumes = -1; 583 for (i = 0; i < info.nvolumes; ++i) { 584 if (mntpt == NULL) { 585 /* 586 * Root mount. 587 */ 588 KKASSERT(next_volume_ptr != NULL); 589 strcpy(path, ""); 590 if (*next_volume_ptr != '/') { 591 /* relative path */ 592 strcpy(path, "/dev/"); 593 } 594 int k; 595 for (k = strlen(path); k < MAXPATHLEN-1; ++k) { 596 if (*next_volume_ptr == '\0') { 597 break; 598 } else if (*next_volume_ptr == ':') { 599 ++next_volume_ptr; 600 break; 601 } else { 602 path[k] = *next_volume_ptr; 603 ++next_volume_ptr; 604 } 605 } 606 path[k] = '\0'; 607 608 error = 0; 609 cdev_t dev = kgetdiskbyname(path); 610 error = bdevvp(dev, &devvp); 611 if (error) { 612 kprintf("hammer_mountroot: can't find devvp\n"); 613 } 614 } else { 615 error = copyin(&info.volumes[i], &upath, 616 sizeof(char *)); 617 if (error == 0) 618 error = copyinstr(upath, path, 619 MAXPATHLEN, NULL); 620 } 621 if (error == 0) 622 error = hammer_install_volume(hmp, path, devvp); 623 if (error) 624 break; 625 } 626 objcache_put(namei_oc, path); 627 628 /* 629 * Make sure we found a root volume 630 */ 631 if (error == 0 && hmp->rootvol == NULL) { 632 kprintf("hammer_mount: No root volume found!\n"); 633 error = EINVAL; 634 } 635 636 /* 637 * Check that all required volumes are available 638 */ 639 if (error == 0 && hammer_mountcheck_volumes(hmp)) { 640 kprintf("hammer_mount: Missing volumes, cannot mount!\n"); 641 error = EINVAL; 642 } 643 644 if (error) { 645 /* called with fs_token held */ 646 hammer_free_hmp(mp); 647 return (error); 648 } 649 650 /* 651 * No errors, setup enough of the mount point so we can lookup the 652 * root vnode. 653 */ 654 mp->mnt_iosize_max = MAXPHYS; 655 mp->mnt_kern_flag |= MNTK_FSMID; 656 657 /* 658 * MPSAFE code. Note that VOPs and VFSops which are not MPSAFE 659 * will acquire a per-mount token prior to entry and release it 660 * on return, so even if we do not specify it we no longer get 661 * the BGL regardlless of how we are flagged. 662 */ 663 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; 664 /*MNTK_RD_MPSAFE | MNTK_GA_MPSAFE | MNTK_IN_MPSAFE;*/ 665 666 /* 667 * note: f_iosize is used by vnode_pager_haspage() when constructing 668 * its VOP_BMAP call. 669 */ 670 mp->mnt_stat.f_iosize = HAMMER_BUFSIZE; 671 mp->mnt_stat.f_bsize = HAMMER_BUFSIZE; 672 673 mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE; 674 mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE; 675 676 mp->mnt_maxsymlinklen = 255; 677 mp->mnt_flag |= MNT_LOCAL; 678 679 vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops); 680 vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops); 681 vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops); 682 683 /* 684 * The root volume's ondisk pointer is only valid if we hold a 685 * reference to it. 686 */ 687 rootvol = hammer_get_root_volume(hmp, &error); 688 if (error) 689 goto failed; 690 691 /* 692 * Perform any necessary UNDO operations. The recovery code does 693 * call hammer_undo_lookup() so we have to pre-cache the blockmap, 694 * and then re-copy it again after recovery is complete. 695 * 696 * If this is a read-only mount the UNDO information is retained 697 * in memory in the form of dirty buffer cache buffers, and not 698 * written back to the media. 699 */ 700 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, 701 sizeof(hmp->blockmap)); 702 703 /* 704 * Check filesystem version 705 */ 706 hmp->version = rootvol->ondisk->vol_version; 707 if (hmp->version < HAMMER_VOL_VERSION_MIN || 708 hmp->version > HAMMER_VOL_VERSION_MAX) { 709 kprintf("HAMMER: mount unsupported fs version %d\n", 710 hmp->version); 711 error = ERANGE; 712 goto done; 713 } 714 715 /* 716 * The undo_rec_limit limits the size of flush groups to avoid 717 * blowing out the UNDO FIFO. This calculation is typically in 718 * the tens of thousands and is designed primarily when small 719 * HAMMER filesystems are created. 720 */ 721 hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100; 722 if (hammer_debug_general & 0x0001) 723 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit); 724 725 /* 726 * NOTE: Recover stage1 not only handles meta-data recovery, it 727 * also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems. 728 */ 729 error = hammer_recover_stage1(hmp, rootvol); 730 if (error) { 731 kprintf("Failed to recover HAMMER filesystem on mount\n"); 732 goto done; 733 } 734 735 /* 736 * Finish setup now that we have a good root volume. 737 * 738 * The top 16 bits of fsid.val[1] is a pfs id. 739 */ 740 ksnprintf(mp->mnt_stat.f_mntfromname, 741 sizeof(mp->mnt_stat.f_mntfromname), "%s", 742 rootvol->ondisk->vol_name); 743 mp->mnt_stat.f_fsid.val[0] = 744 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8); 745 mp->mnt_stat.f_fsid.val[1] = 746 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8); 747 mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF; 748 749 mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid; 750 mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid, 751 sizeof(mp->mnt_vstat.f_fsid_uuid)); 752 753 /* 754 * Certain often-modified fields in the root volume are cached in 755 * the hammer_mount structure so we do not have to generate lots 756 * of little UNDO structures for them. 757 * 758 * Recopy after recovery. This also has the side effect of 759 * setting our cached undo FIFO's first_offset, which serves to 760 * placemark the FIFO start for the NEXT flush cycle while the 761 * on-disk first_offset represents the LAST flush cycle. 762 */ 763 hmp->next_tid = rootvol->ondisk->vol0_next_tid; 764 hmp->flush_tid1 = hmp->next_tid; 765 hmp->flush_tid2 = hmp->next_tid; 766 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, 767 sizeof(hmp->blockmap)); 768 hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks; 769 770 hammer_flusher_create(hmp); 771 772 /* 773 * Locate the root directory using the root cluster's B-Tree as a 774 * starting point. The root directory uses an obj_id of 1. 775 * 776 * FUTURE: Leave the root directory cached referenced but unlocked 777 * in hmp->rootvp (need to flush it on unmount). 778 */ 779 error = hammer_vfs_vget(mp, NULL, 1, &rootvp); 780 if (error) 781 goto done; 782 vput(rootvp); 783 /*vn_unlock(hmp->rootvp);*/ 784 if (hmp->ronly == 0) 785 error = hammer_recover_stage2(hmp, rootvol); 786 787 /* 788 * If the stage2 recovery fails be sure to clean out all cached 789 * vnodes before throwing away the mount structure or bad things 790 * will happen. 791 */ 792 if (error) 793 vflush(mp, 0, 0); 794 795 done: 796 hammer_rel_volume(rootvol, 0); 797 failed: 798 /* 799 * Cleanup and return. 800 */ 801 if (error) { 802 /* called with fs_token held */ 803 hammer_free_hmp(mp); 804 } else { 805 lwkt_reltoken(&hmp->fs_token); 806 } 807 return (error); 808 } 809 810 static int 811 hammer_vfs_unmount(struct mount *mp, int mntflags) 812 { 813 hammer_mount_t hmp = (void *)mp->mnt_data; 814 int flags; 815 int error; 816 817 /* 818 * Clean out the vnodes 819 */ 820 lwkt_gettoken(&hmp->fs_token); 821 flags = 0; 822 if (mntflags & MNT_FORCE) 823 flags |= FORCECLOSE; 824 error = vflush(mp, 0, flags); 825 826 /* 827 * Clean up the internal mount structure and related entities. This 828 * may issue I/O. 829 */ 830 if (error == 0) { 831 /* called with fs_token held */ 832 hammer_free_hmp(mp); 833 } else { 834 lwkt_reltoken(&hmp->fs_token); 835 } 836 return(error); 837 } 838 839 /* 840 * Clean up the internal mount structure and disassociate it from the mount. 841 * This may issue I/O. 842 * 843 * Called with fs_token held. 844 */ 845 static void 846 hammer_free_hmp(struct mount *mp) 847 { 848 hammer_mount_t hmp = (void *)mp->mnt_data; 849 hammer_flush_group_t flg; 850 int count; 851 int dummy; 852 853 /* 854 * Flush anything dirty. This won't even run if the 855 * filesystem errored-out. 856 */ 857 count = 0; 858 while (hammer_flusher_haswork(hmp)) { 859 hammer_flusher_sync(hmp); 860 ++count; 861 if (count >= 5) { 862 if (count == 5) 863 kprintf("HAMMER: umount flushing."); 864 else 865 kprintf("."); 866 tsleep(&dummy, 0, "hmrufl", hz); 867 } 868 if (count == 30) { 869 kprintf("giving up\n"); 870 break; 871 } 872 } 873 if (count >= 5 && count < 30) 874 kprintf("\n"); 875 876 /* 877 * If the mount had a critical error we have to destroy any 878 * remaining inodes before we can finish cleaning up the flusher. 879 */ 880 if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) { 881 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 882 hammer_destroy_inode_callback, NULL); 883 } 884 885 /* 886 * There shouldn't be any inodes left now and any left over 887 * flush groups should now be empty. 888 */ 889 KKASSERT(RB_EMPTY(&hmp->rb_inos_root)); 890 while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) { 891 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry); 892 KKASSERT(RB_EMPTY(&flg->flush_tree)); 893 if (flg->refs) { 894 kprintf("HAMMER: Warning, flush_group %p was " 895 "not empty on umount!\n", flg); 896 } 897 kfree(flg, hmp->m_misc); 898 } 899 900 /* 901 * We can finally destroy the flusher 902 */ 903 hammer_flusher_destroy(hmp); 904 905 /* 906 * We may have held recovered buffers due to a read-only mount. 907 * These must be discarded. 908 */ 909 if (hmp->ronly) 910 hammer_recover_flush_buffers(hmp, NULL, -1); 911 912 /* 913 * Unload buffers and then volumes 914 */ 915 RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL, 916 hammer_unload_buffer, NULL); 917 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 918 hammer_unload_volume, NULL); 919 920 mp->mnt_data = NULL; 921 mp->mnt_flag &= ~MNT_LOCAL; 922 hmp->mp = NULL; 923 hammer_destroy_objid_cache(hmp); 924 hammer_destroy_dedup_cache(hmp); 925 if (hmp->dedup_free_cache != NULL) { 926 kfree(hmp->dedup_free_cache, hmp->m_misc); 927 hmp->dedup_free_cache = NULL; 928 } 929 kmalloc_destroy(&hmp->m_misc); 930 kmalloc_destroy(&hmp->m_inodes); 931 lwkt_reltoken(&hmp->fs_token); 932 kfree(hmp, M_HAMMER); 933 } 934 935 /* 936 * Report critical errors. ip may be NULL. 937 */ 938 void 939 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip, 940 int error, const char *msg) 941 { 942 hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR; 943 944 krateprintf(&hmp->krate, 945 "HAMMER(%s): Critical error inode=%jd error=%d %s\n", 946 hmp->mp->mnt_stat.f_mntfromname, 947 (intmax_t)(ip ? ip->obj_id : -1), 948 error, msg); 949 950 if (hmp->ronly == 0) { 951 hmp->ronly = 2; /* special errored read-only mode */ 952 hmp->mp->mnt_flag |= MNT_RDONLY; 953 kprintf("HAMMER(%s): Forcing read-only mode\n", 954 hmp->mp->mnt_stat.f_mntfromname); 955 } 956 hmp->error = error; 957 if (hammer_debug_critical) 958 Debugger("Entering debugger"); 959 } 960 961 962 /* 963 * Obtain a vnode for the specified inode number. An exclusively locked 964 * vnode is returned. 965 */ 966 int 967 hammer_vfs_vget(struct mount *mp, struct vnode *dvp, 968 ino_t ino, struct vnode **vpp) 969 { 970 struct hammer_transaction trans; 971 struct hammer_mount *hmp = (void *)mp->mnt_data; 972 struct hammer_inode *ip; 973 int error; 974 u_int32_t localization; 975 976 lwkt_gettoken(&hmp->fs_token); 977 hammer_simple_transaction(&trans, hmp); 978 979 /* 980 * If a directory vnode is supplied (mainly NFS) then we can acquire 981 * the PFS domain from it. Otherwise we would only be able to vget 982 * inodes in the root PFS. 983 */ 984 if (dvp) { 985 localization = HAMMER_DEF_LOCALIZATION + 986 VTOI(dvp)->obj_localization; 987 } else { 988 localization = HAMMER_DEF_LOCALIZATION; 989 } 990 991 /* 992 * Lookup the requested HAMMER inode. The structure must be 993 * left unlocked while we manipulate the related vnode to avoid 994 * a deadlock. 995 */ 996 ip = hammer_get_inode(&trans, NULL, ino, 997 hmp->asof, localization, 998 0, &error); 999 if (ip == NULL) { 1000 *vpp = NULL; 1001 } else { 1002 error = hammer_get_vnode(ip, vpp); 1003 hammer_rel_inode(ip, 0); 1004 } 1005 hammer_done_transaction(&trans); 1006 lwkt_reltoken(&hmp->fs_token); 1007 return (error); 1008 } 1009 1010 /* 1011 * Return the root vnode for the filesystem. 1012 * 1013 * HAMMER stores the root vnode in the hammer_mount structure so 1014 * getting it is easy. 1015 */ 1016 static int 1017 hammer_vfs_root(struct mount *mp, struct vnode **vpp) 1018 { 1019 int error; 1020 1021 error = hammer_vfs_vget(mp, NULL, 1, vpp); 1022 return (error); 1023 } 1024 1025 static int 1026 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 1027 { 1028 struct hammer_mount *hmp = (void *)mp->mnt_data; 1029 hammer_volume_t volume; 1030 hammer_volume_ondisk_t ondisk; 1031 int error; 1032 int64_t bfree; 1033 int64_t breserved; 1034 1035 lwkt_gettoken(&hmp->fs_token); 1036 volume = hammer_get_root_volume(hmp, &error); 1037 if (error) { 1038 lwkt_reltoken(&hmp->fs_token); 1039 return(error); 1040 } 1041 ondisk = volume->ondisk; 1042 1043 /* 1044 * Basic stats 1045 */ 1046 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved); 1047 mp->mnt_stat.f_files = ondisk->vol0_stat_inodes; 1048 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE; 1049 hammer_rel_volume(volume, 0); 1050 1051 mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE; 1052 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree; 1053 if (mp->mnt_stat.f_files < 0) 1054 mp->mnt_stat.f_files = 0; 1055 1056 *sbp = mp->mnt_stat; 1057 lwkt_reltoken(&hmp->fs_token); 1058 return(0); 1059 } 1060 1061 static int 1062 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 1063 { 1064 struct hammer_mount *hmp = (void *)mp->mnt_data; 1065 hammer_volume_t volume; 1066 hammer_volume_ondisk_t ondisk; 1067 int error; 1068 int64_t bfree; 1069 int64_t breserved; 1070 1071 lwkt_gettoken(&hmp->fs_token); 1072 volume = hammer_get_root_volume(hmp, &error); 1073 if (error) { 1074 lwkt_reltoken(&hmp->fs_token); 1075 return(error); 1076 } 1077 ondisk = volume->ondisk; 1078 1079 /* 1080 * Basic stats 1081 */ 1082 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved); 1083 mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes; 1084 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE; 1085 hammer_rel_volume(volume, 0); 1086 1087 mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE; 1088 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree; 1089 if (mp->mnt_vstat.f_files < 0) 1090 mp->mnt_vstat.f_files = 0; 1091 *sbp = mp->mnt_vstat; 1092 lwkt_reltoken(&hmp->fs_token); 1093 return(0); 1094 } 1095 1096 /* 1097 * Sync the filesystem. Currently we have to run it twice, the second 1098 * one will advance the undo start index to the end index, so if a crash 1099 * occurs no undos will be run on mount. 1100 * 1101 * We do not sync the filesystem if we are called from a panic. If we did 1102 * we might end up blowing up a sync that was already in progress. 1103 */ 1104 static int 1105 hammer_vfs_sync(struct mount *mp, int waitfor) 1106 { 1107 struct hammer_mount *hmp = (void *)mp->mnt_data; 1108 int error; 1109 1110 lwkt_gettoken(&hmp->fs_token); 1111 if (panicstr == NULL) { 1112 error = hammer_sync_hmp(hmp, waitfor); 1113 } else { 1114 error = EIO; 1115 } 1116 lwkt_reltoken(&hmp->fs_token); 1117 return (error); 1118 } 1119 1120 /* 1121 * Convert a vnode to a file handle. 1122 * 1123 * Accesses read-only fields on already-referenced structures so 1124 * no token is needed. 1125 */ 1126 static int 1127 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp) 1128 { 1129 hammer_inode_t ip; 1130 1131 KKASSERT(MAXFIDSZ >= 16); 1132 ip = VTOI(vp); 1133 fhp->fid_len = offsetof(struct fid, fid_data[16]); 1134 fhp->fid_ext = ip->obj_localization >> 16; 1135 bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id)); 1136 bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof)); 1137 return(0); 1138 } 1139 1140 1141 /* 1142 * Convert a file handle back to a vnode. 1143 * 1144 * Use rootvp to enforce PFS isolation when a PFS is exported via a 1145 * null mount. 1146 */ 1147 static int 1148 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 1149 struct fid *fhp, struct vnode **vpp) 1150 { 1151 hammer_mount_t hmp = (void *)mp->mnt_data; 1152 struct hammer_transaction trans; 1153 struct hammer_inode *ip; 1154 struct hammer_inode_info info; 1155 int error; 1156 u_int32_t localization; 1157 1158 bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id)); 1159 bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof)); 1160 if (rootvp) 1161 localization = VTOI(rootvp)->obj_localization; 1162 else 1163 localization = (u_int32_t)fhp->fid_ext << 16; 1164 1165 lwkt_gettoken(&hmp->fs_token); 1166 hammer_simple_transaction(&trans, hmp); 1167 1168 /* 1169 * Get/allocate the hammer_inode structure. The structure must be 1170 * unlocked while we manipulate the related vnode to avoid a 1171 * deadlock. 1172 */ 1173 ip = hammer_get_inode(&trans, NULL, info.obj_id, 1174 info.obj_asof, localization, 0, &error); 1175 if (ip) { 1176 error = hammer_get_vnode(ip, vpp); 1177 hammer_rel_inode(ip, 0); 1178 } else { 1179 *vpp = NULL; 1180 } 1181 hammer_done_transaction(&trans); 1182 lwkt_reltoken(&hmp->fs_token); 1183 return (error); 1184 } 1185 1186 static int 1187 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 1188 int *exflagsp, struct ucred **credanonp) 1189 { 1190 hammer_mount_t hmp = (void *)mp->mnt_data; 1191 struct netcred *np; 1192 int error; 1193 1194 lwkt_gettoken(&hmp->fs_token); 1195 np = vfs_export_lookup(mp, &hmp->export, nam); 1196 if (np) { 1197 *exflagsp = np->netc_exflags; 1198 *credanonp = &np->netc_anon; 1199 error = 0; 1200 } else { 1201 error = EACCES; 1202 } 1203 lwkt_reltoken(&hmp->fs_token); 1204 return (error); 1205 1206 } 1207 1208 int 1209 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export) 1210 { 1211 hammer_mount_t hmp = (void *)mp->mnt_data; 1212 int error; 1213 1214 lwkt_gettoken(&hmp->fs_token); 1215 1216 switch(op) { 1217 case MOUNTCTL_SET_EXPORT: 1218 error = vfs_export(mp, &hmp->export, export); 1219 break; 1220 default: 1221 error = EOPNOTSUPP; 1222 break; 1223 } 1224 lwkt_reltoken(&hmp->fs_token); 1225 1226 return(error); 1227 } 1228 1229