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_debug = 1; /* medium-error panics */ 47 int hammer_debug_inode; 48 int hammer_debug_locks; 49 int hammer_debug_btree; 50 int hammer_debug_tid; 51 int hammer_debug_recover; /* -1 will disable, +1 will force */ 52 int hammer_debug_recover_faults; 53 int hammer_debug_critical; /* non-zero enter debugger on error */ 54 int hammer_cluster_enable = 1; /* enable read clustering by default */ 55 int hammer_live_dedup = 0; 56 int hammer_tdmux_ticks; 57 int hammer_count_fsyncs; 58 int hammer_count_inodes; 59 int hammer_count_iqueued; 60 int hammer_count_reclaims; 61 int hammer_count_records; 62 int hammer_count_record_datas; 63 int hammer_count_volumes; 64 int hammer_count_buffers; 65 int hammer_count_nodes; 66 int64_t hammer_count_extra_space_used; 67 int64_t hammer_stats_btree_lookups; 68 int64_t hammer_stats_btree_searches; 69 int64_t hammer_stats_btree_inserts; 70 int64_t hammer_stats_btree_deletes; 71 int64_t hammer_stats_btree_elements; 72 int64_t hammer_stats_btree_splits; 73 int64_t hammer_stats_btree_iterations; 74 int64_t hammer_stats_btree_root_iterations; 75 int64_t hammer_stats_record_iterations; 76 77 int64_t hammer_stats_file_read; 78 int64_t hammer_stats_file_write; 79 int64_t hammer_stats_file_iopsr; 80 int64_t hammer_stats_file_iopsw; 81 int64_t hammer_stats_disk_read; 82 int64_t hammer_stats_disk_write; 83 int64_t hammer_stats_inode_flushes; 84 int64_t hammer_stats_commits; 85 int64_t hammer_stats_undo; 86 int64_t hammer_stats_redo; 87 88 long hammer_count_dirtybufspace; /* global */ 89 int hammer_count_refedbufs; /* global */ 90 int hammer_count_reservations; 91 long hammer_count_io_running_read; 92 long hammer_count_io_running_write; 93 int hammer_count_io_locked; 94 long hammer_limit_dirtybufspace; /* per-mount */ 95 int hammer_limit_recs; /* as a whole XXX */ 96 int hammer_limit_inode_recs = 2048; /* per inode */ 97 int hammer_limit_reclaims; 98 int hammer_live_dedup_cache_size = DEDUP_CACHE_SIZE; 99 int hammer_limit_redo = 4096 * 1024; /* per inode */ 100 int hammer_autoflush = 500; /* auto flush (typ on reclaim) */ 101 int hammer_bio_count; 102 int hammer_verify_zone; 103 int hammer_verify_data = 1; 104 int hammer_write_mode; 105 int hammer_double_buffer; 106 int hammer_btree_full_undo = 1; 107 int hammer_yield_check = 16; 108 int hammer_fsync_mode = 3; 109 int64_t hammer_contention_count; 110 int64_t hammer_zone_limit; 111 112 /* 113 * Live dedup debug counters (sysctls are writable so that counters 114 * can be reset from userspace). 115 */ 116 int64_t hammer_live_dedup_vnode_bcmps = 0; 117 int64_t hammer_live_dedup_device_bcmps = 0; 118 int64_t hammer_live_dedup_findblk_failures = 0; 119 int64_t hammer_live_dedup_bmap_saves = 0; 120 121 122 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem"); 123 124 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD, 125 &hammer_supported_version, 0, ""); 126 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW, 127 &hammer_debug_general, 0, ""); 128 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW, 129 &hammer_debug_io, 0, ""); 130 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW, 131 &hammer_debug_debug, 0, ""); 132 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW, 133 &hammer_debug_inode, 0, ""); 134 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW, 135 &hammer_debug_locks, 0, ""); 136 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW, 137 &hammer_debug_btree, 0, ""); 138 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW, 139 &hammer_debug_tid, 0, ""); 140 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW, 141 &hammer_debug_recover, 0, ""); 142 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW, 143 &hammer_debug_recover_faults, 0, ""); 144 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW, 145 &hammer_debug_critical, 0, ""); 146 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW, 147 &hammer_cluster_enable, 0, ""); 148 /* 149 * 0 - live dedup is disabled 150 * 1 - dedup cache is populated on reads only 151 * 2 - dedup cache is populated on both reads and writes 152 * 153 * LIVE_DEDUP IS DISABLED PERMANENTLY! This feature appears to cause 154 * blockmap corruption over time so we've turned it off permanently. 155 */ 156 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup, CTLFLAG_RD, 157 &hammer_live_dedup, 0, "Enable live dedup (experimental)"); 158 SYSCTL_INT(_vfs_hammer, OID_AUTO, tdmux_ticks, CTLFLAG_RW, 159 &hammer_tdmux_ticks, 0, "Hammer tdmux ticks"); 160 161 SYSCTL_LONG(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW, 162 &hammer_limit_dirtybufspace, 0, ""); 163 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW, 164 &hammer_limit_recs, 0, ""); 165 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW, 166 &hammer_limit_inode_recs, 0, ""); 167 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaims, CTLFLAG_RW, 168 &hammer_limit_reclaims, 0, ""); 169 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup_cache_size, CTLFLAG_RW, 170 &hammer_live_dedup_cache_size, 0, 171 "Number of cache entries"); 172 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW, 173 &hammer_limit_redo, 0, ""); 174 175 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD, 176 &hammer_count_fsyncs, 0, ""); 177 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD, 178 &hammer_count_inodes, 0, ""); 179 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD, 180 &hammer_count_iqueued, 0, ""); 181 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaims, CTLFLAG_RD, 182 &hammer_count_reclaims, 0, ""); 183 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD, 184 &hammer_count_records, 0, ""); 185 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD, 186 &hammer_count_record_datas, 0, ""); 187 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD, 188 &hammer_count_volumes, 0, ""); 189 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD, 190 &hammer_count_buffers, 0, ""); 191 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD, 192 &hammer_count_nodes, 0, ""); 193 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD, 194 &hammer_count_extra_space_used, 0, ""); 195 196 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD, 197 &hammer_stats_btree_searches, 0, ""); 198 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD, 199 &hammer_stats_btree_lookups, 0, ""); 200 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD, 201 &hammer_stats_btree_inserts, 0, ""); 202 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD, 203 &hammer_stats_btree_deletes, 0, ""); 204 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD, 205 &hammer_stats_btree_elements, 0, ""); 206 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD, 207 &hammer_stats_btree_splits, 0, ""); 208 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD, 209 &hammer_stats_btree_iterations, 0, ""); 210 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD, 211 &hammer_stats_btree_root_iterations, 0, ""); 212 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD, 213 &hammer_stats_record_iterations, 0, ""); 214 215 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD, 216 &hammer_stats_file_read, 0, ""); 217 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD, 218 &hammer_stats_file_write, 0, ""); 219 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD, 220 &hammer_stats_file_iopsr, 0, ""); 221 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD, 222 &hammer_stats_file_iopsw, 0, ""); 223 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD, 224 &hammer_stats_disk_read, 0, ""); 225 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD, 226 &hammer_stats_disk_write, 0, ""); 227 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD, 228 &hammer_stats_inode_flushes, 0, ""); 229 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD, 230 &hammer_stats_commits, 0, ""); 231 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD, 232 &hammer_stats_undo, 0, ""); 233 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD, 234 &hammer_stats_redo, 0, ""); 235 236 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_vnode_bcmps, CTLFLAG_RW, 237 &hammer_live_dedup_vnode_bcmps, 0, 238 "successful vnode buffer comparisons"); 239 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_device_bcmps, CTLFLAG_RW, 240 &hammer_live_dedup_device_bcmps, 0, 241 "successful device buffer comparisons"); 242 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_findblk_failures, CTLFLAG_RW, 243 &hammer_live_dedup_findblk_failures, 0, 244 "block lookup failures for comparison"); 245 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_bmap_saves, CTLFLAG_RW, 246 &hammer_live_dedup_bmap_saves, 0, 247 "useful physical block lookups"); 248 249 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD, 250 &hammer_count_dirtybufspace, 0, ""); 251 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD, 252 &hammer_count_refedbufs, 0, ""); 253 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD, 254 &hammer_count_reservations, 0, ""); 255 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD, 256 &hammer_count_io_running_read, 0, ""); 257 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD, 258 &hammer_count_io_locked, 0, ""); 259 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD, 260 &hammer_count_io_running_write, 0, ""); 261 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW, 262 &hammer_zone_limit, 0, ""); 263 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW, 264 &hammer_contention_count, 0, ""); 265 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW, 266 &hammer_autoflush, 0, ""); 267 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW, 268 &hammer_verify_zone, 0, ""); 269 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW, 270 &hammer_verify_data, 0, ""); 271 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW, 272 &hammer_write_mode, 0, ""); 273 SYSCTL_INT(_vfs_hammer, OID_AUTO, double_buffer, CTLFLAG_RW, 274 &hammer_double_buffer, 0, ""); 275 SYSCTL_INT(_vfs_hammer, OID_AUTO, btree_full_undo, CTLFLAG_RW, 276 &hammer_btree_full_undo, 0, ""); 277 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW, 278 &hammer_yield_check, 0, ""); 279 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW, 280 &hammer_fsync_mode, 0, ""); 281 282 /* KTR_INFO_MASTER(hammer); */ 283 284 /* 285 * VFS ABI 286 */ 287 static void hammer_free_hmp(struct mount *mp); 288 289 static int hammer_vfs_mount(struct mount *mp, char *path, caddr_t data, 290 struct ucred *cred); 291 static int hammer_vfs_unmount(struct mount *mp, int mntflags); 292 static int hammer_vfs_root(struct mount *mp, struct vnode **vpp); 293 static int hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, 294 struct ucred *cred); 295 static int hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, 296 struct ucred *cred); 297 static int hammer_vfs_sync(struct mount *mp, int waitfor); 298 static int hammer_vfs_vget(struct mount *mp, struct vnode *dvp, 299 ino_t ino, struct vnode **vpp); 300 static int hammer_vfs_init(struct vfsconf *conf); 301 static int hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 302 struct fid *fhp, struct vnode **vpp); 303 static int hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp); 304 static int hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 305 int *exflagsp, struct ucred **credanonp); 306 307 308 static struct vfsops hammer_vfsops = { 309 .vfs_mount = hammer_vfs_mount, 310 .vfs_unmount = hammer_vfs_unmount, 311 .vfs_root = hammer_vfs_root, 312 .vfs_statfs = hammer_vfs_statfs, 313 .vfs_statvfs = hammer_vfs_statvfs, 314 .vfs_sync = hammer_vfs_sync, 315 .vfs_vget = hammer_vfs_vget, 316 .vfs_init = hammer_vfs_init, 317 .vfs_vptofh = hammer_vfs_vptofh, 318 .vfs_fhtovp = hammer_vfs_fhtovp, 319 .vfs_checkexp = hammer_vfs_checkexp 320 }; 321 322 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", ""); 323 324 VFS_SET(hammer_vfsops, hammer, 0); 325 MODULE_VERSION(hammer, 1); 326 327 static int 328 hammer_vfs_init(struct vfsconf *conf) 329 { 330 long n; 331 332 /* 333 * Wait up to this long for an exclusive deadlock to clear 334 * before acquiring a new shared lock on the ip. The deadlock 335 * may have occured on a b-tree node related to the ip. 336 */ 337 if (hammer_tdmux_ticks == 0) 338 hammer_tdmux_ticks = hz / 5; 339 340 /* 341 * Autosize, but be careful because a hammer filesystem's 342 * reserve is partially calculated based on dirtybufspace, 343 * so we simply cannot allow it to get too large. 344 */ 345 if (hammer_limit_recs == 0) { 346 n = nbuf * 25; 347 if (n > kmalloc_limit(M_HAMMER) / 512) 348 n = kmalloc_limit(M_HAMMER) / 512; 349 if (n > 2 * 1024 * 1024) 350 n = 2 * 1024 * 1024; 351 hammer_limit_recs = (int)n; 352 } 353 if (hammer_limit_dirtybufspace == 0) { 354 hammer_limit_dirtybufspace = hidirtybufspace / 2; 355 if (hammer_limit_dirtybufspace < 1L * 1024 * 1024) 356 hammer_limit_dirtybufspace = 1024L * 1024; 357 if (hammer_limit_dirtybufspace > 1024L * 1024 * 1024) 358 hammer_limit_dirtybufspace = 1024L * 1024 * 1024; 359 } 360 361 /* 362 * The hammer_inode structure detaches from the vnode on reclaim. 363 * This limits the number of inodes in this state to prevent a 364 * memory pool blowout. 365 */ 366 if (hammer_limit_reclaims == 0) 367 hammer_limit_reclaims = desiredvnodes / 10; 368 369 return(0); 370 } 371 372 static int 373 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data, 374 struct ucred *cred) 375 { 376 struct hammer_mount_info info; 377 hammer_mount_t hmp; 378 hammer_volume_t rootvol; 379 struct vnode *rootvp; 380 struct vnode *devvp = NULL; 381 const char *upath; /* volume name in userspace */ 382 char *path; /* volume name in system space */ 383 int error; 384 int i; 385 int master_id; 386 int nvolumes; 387 char *next_volume_ptr = NULL; 388 389 /* 390 * Accept hammer_mount_info. mntpt is NULL for root mounts at boot. 391 */ 392 if (mntpt == NULL) { 393 bzero(&info, sizeof(info)); 394 info.asof = 0; 395 info.hflags = 0; 396 info.nvolumes = 1; 397 398 next_volume_ptr = mp->mnt_stat.f_mntfromname; 399 400 /* Count number of volumes separated by ':' */ 401 for (char *p = next_volume_ptr; *p != '\0'; ++p) { 402 if (*p == ':') { 403 ++info.nvolumes; 404 } 405 } 406 407 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */ 408 } else { 409 if ((error = copyin(data, &info, sizeof(info))) != 0) 410 return (error); 411 } 412 413 /* 414 * updating or new mount 415 */ 416 if (mp->mnt_flag & MNT_UPDATE) { 417 hmp = (void *)mp->mnt_data; 418 KKASSERT(hmp != NULL); 419 } else { 420 if (info.nvolumes <= 0 || info.nvolumes > HAMMER_MAX_VOLUMES) 421 return (EINVAL); 422 hmp = NULL; 423 } 424 425 /* 426 * master-id validation. The master id may not be changed by a 427 * mount update. 428 */ 429 if (info.hflags & HMNT_MASTERID) { 430 if (hmp && hmp->master_id != info.master_id) { 431 kprintf("HAMMER: cannot change master id " 432 "with mount update\n"); 433 return(EINVAL); 434 } 435 master_id = info.master_id; 436 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS) 437 return (EINVAL); 438 } else { 439 if (hmp) 440 master_id = hmp->master_id; 441 else 442 master_id = 0; 443 } 444 445 /* 446 * Internal mount data structure 447 */ 448 if (hmp == NULL) { 449 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO); 450 mp->mnt_data = (qaddr_t)hmp; 451 hmp->mp = mp; 452 453 /* 454 * Make sure kmalloc type limits are set appropriately. 455 * 456 * Our inode kmalloc group is sized based on maxvnodes 457 * (controlled by the system, not us). 458 */ 459 kmalloc_create(&hmp->m_misc, "HAMMER-others"); 460 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes"); 461 462 kmalloc_raise_limit(hmp->m_inodes, 0); /* unlimited */ 463 464 hmp->root_btree_beg.localization = 0x00000000U; 465 hmp->root_btree_beg.obj_id = -0x8000000000000000LL; 466 hmp->root_btree_beg.key = -0x8000000000000000LL; 467 hmp->root_btree_beg.create_tid = 1; 468 hmp->root_btree_beg.delete_tid = 1; 469 hmp->root_btree_beg.rec_type = 0; 470 hmp->root_btree_beg.obj_type = 0; 471 hmp->root_btree_beg.btype = HAMMER_BTREE_TYPE_NONE; 472 473 hmp->root_btree_end.localization = 0xFFFFFFFFU; 474 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL; 475 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL; 476 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL; 477 hmp->root_btree_end.delete_tid = 0; /* special case */ 478 hmp->root_btree_end.rec_type = 0xFFFFU; 479 hmp->root_btree_end.obj_type = 0; 480 hmp->root_btree_end.btype = HAMMER_BTREE_TYPE_NONE; 481 482 hmp->krate.freq = 1; /* maximum reporting rate (hz) */ 483 hmp->krate.count = -16; /* initial burst */ 484 hmp->kdiag.freq = 1; /* maximum reporting rate (hz) */ 485 hmp->kdiag.count = -16; /* initial burst */ 486 487 hmp->sync_lock.refs = 1; 488 hmp->free_lock.refs = 1; 489 hmp->undo_lock.refs = 1; 490 hmp->blkmap_lock.refs = 1; 491 hmp->snapshot_lock.refs = 1; 492 hmp->volume_lock.refs = 1; 493 494 TAILQ_INIT(&hmp->delay_list); 495 TAILQ_INIT(&hmp->flush_group_list); 496 TAILQ_INIT(&hmp->objid_cache_list); 497 TAILQ_INIT(&hmp->undo_lru_list); 498 TAILQ_INIT(&hmp->reclaim_list); 499 500 RB_INIT(&hmp->rb_dedup_crc_root); 501 RB_INIT(&hmp->rb_dedup_off_root); 502 TAILQ_INIT(&hmp->dedup_lru_list); 503 } 504 hmp->hflags &= ~HMNT_USERFLAGS; 505 hmp->hflags |= info.hflags & HMNT_USERFLAGS; 506 507 hmp->master_id = master_id; 508 509 if (info.asof) { 510 mp->mnt_flag |= MNT_RDONLY; 511 hmp->asof = info.asof; 512 } else { 513 hmp->asof = HAMMER_MAX_TID; 514 } 515 516 hmp->volume_to_remove = -1; 517 518 /* 519 * Re-open read-write if originally read-only, or vise-versa. 520 * 521 * When going from read-only to read-write execute the stage2 522 * recovery if it has not already been run. 523 */ 524 if (mp->mnt_flag & MNT_UPDATE) { 525 lwkt_gettoken(&hmp->fs_token); 526 error = 0; 527 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 528 kprintf("HAMMER: read-only -> read-write\n"); 529 hmp->ronly = 0; 530 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 531 hammer_adjust_volume_mode, NULL); 532 rootvol = hammer_get_root_volume(hmp, &error); 533 if (rootvol) { 534 hammer_recover_flush_buffers(hmp, rootvol, 1); 535 error = hammer_recover_stage2(hmp, rootvol); 536 bcopy(rootvol->ondisk->vol0_blockmap, 537 hmp->blockmap, 538 sizeof(hmp->blockmap)); 539 hammer_rel_volume(rootvol, 0); 540 } 541 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 542 hammer_reload_inode, NULL); 543 /* kernel clears MNT_RDONLY */ 544 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 545 kprintf("HAMMER: read-write -> read-only\n"); 546 hmp->ronly = 1; /* messy */ 547 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 548 hammer_reload_inode, NULL); 549 hmp->ronly = 0; 550 hammer_flusher_sync(hmp); 551 hammer_flusher_sync(hmp); 552 hammer_flusher_sync(hmp); 553 hmp->ronly = 1; 554 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 555 hammer_adjust_volume_mode, NULL); 556 } 557 lwkt_reltoken(&hmp->fs_token); 558 return(error); 559 } 560 561 RB_INIT(&hmp->rb_vols_root); 562 RB_INIT(&hmp->rb_inos_root); 563 RB_INIT(&hmp->rb_redo_root); 564 RB_INIT(&hmp->rb_nods_root); 565 RB_INIT(&hmp->rb_undo_root); 566 RB_INIT(&hmp->rb_resv_root); 567 RB_INIT(&hmp->rb_bufs_root); 568 RB_INIT(&hmp->rb_pfsm_root); 569 570 hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); 571 572 RB_INIT(&hmp->volu_root); 573 RB_INIT(&hmp->undo_root); 574 RB_INIT(&hmp->data_root); 575 RB_INIT(&hmp->meta_root); 576 RB_INIT(&hmp->lose_root); 577 TAILQ_INIT(&hmp->iorun_list); 578 579 lwkt_token_init(&hmp->fs_token, "hammerfs"); 580 lwkt_token_init(&hmp->io_token, "hammerio"); 581 582 lwkt_gettoken(&hmp->fs_token); 583 584 /* 585 * Load volumes 586 */ 587 path = objcache_get(namei_oc, M_WAITOK); 588 hmp->nvolumes = -1; 589 for (i = 0; i < info.nvolumes; ++i) { 590 if (mntpt == NULL) { 591 /* 592 * Root mount. 593 */ 594 KKASSERT(next_volume_ptr != NULL); 595 strcpy(path, ""); 596 if (*next_volume_ptr != '/') { 597 /* relative path */ 598 strcpy(path, "/dev/"); 599 } 600 int k; 601 for (k = strlen(path); k < MAXPATHLEN-1; ++k) { 602 if (*next_volume_ptr == '\0') { 603 break; 604 } else if (*next_volume_ptr == ':') { 605 ++next_volume_ptr; 606 break; 607 } else { 608 path[k] = *next_volume_ptr; 609 ++next_volume_ptr; 610 } 611 } 612 path[k] = '\0'; 613 614 error = 0; 615 cdev_t dev = kgetdiskbyname(path); 616 error = bdevvp(dev, &devvp); 617 if (error) { 618 kprintf("hammer_mount: can't find devvp\n"); 619 } 620 } else { 621 error = copyin(&info.volumes[i], &upath, 622 sizeof(char *)); 623 if (error == 0) 624 error = copyinstr(upath, path, 625 MAXPATHLEN, NULL); 626 } 627 if (error == 0) 628 error = hammer_install_volume(hmp, path, devvp, NULL); 629 if (error) 630 break; 631 } 632 objcache_put(namei_oc, path); 633 634 /* 635 * Make sure we found a root volume 636 */ 637 if (hmp->rootvol == NULL) { 638 if (error == EBUSY) { 639 kprintf("hammer_mount: The volumes are probably mounted\n"); 640 } else { 641 kprintf("hammer_mount: No root volume found!\n"); 642 error = EINVAL; 643 } 644 goto failed; 645 } 646 647 /* 648 * Check that all required volumes are available 649 */ 650 if (error == 0 && hammer_mountcheck_volumes(hmp)) { 651 kprintf("hammer_mount: Missing volumes, cannot mount!\n"); 652 error = EINVAL; 653 goto failed; 654 } 655 656 /* 657 * Other errors 658 */ 659 if (error) { 660 kprintf("hammer_mount: Failed to load volumes!\n"); 661 goto failed; 662 } 663 664 nvolumes = hammer_get_installed_volumes(hmp); 665 if (hmp->nvolumes != nvolumes) { 666 kprintf("hammer_mount: volume header says %d volumes, " 667 "but %d installed\n", 668 hmp->nvolumes, nvolumes); 669 error = EINVAL; 670 goto failed; 671 } 672 673 /* 674 * No errors, setup enough of the mount point so we can lookup the 675 * root vnode. 676 */ 677 mp->mnt_iosize_max = MAXPHYS; 678 mp->mnt_kern_flag |= MNTK_FSMID; 679 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */ 680 681 /* 682 * MPSAFE code. Note that VOPs and VFSops which are not MPSAFE 683 * will acquire a per-mount token prior to entry and release it 684 * on return. 685 */ 686 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; 687 688 /* 689 * note: f_iosize is used by vnode_pager_haspage() when constructing 690 * its VOP_BMAP call. 691 */ 692 mp->mnt_stat.f_iosize = HAMMER_BUFSIZE; 693 mp->mnt_stat.f_bsize = HAMMER_BUFSIZE; 694 695 mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE; 696 mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE; 697 698 mp->mnt_maxsymlinklen = 255; 699 mp->mnt_flag |= MNT_LOCAL; 700 701 vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops); 702 vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops); 703 vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops); 704 705 /* 706 * The root volume's ondisk pointer is only valid if we hold a 707 * reference to it. 708 */ 709 rootvol = hammer_get_root_volume(hmp, &error); 710 if (error) 711 goto failed; 712 713 /* 714 * Perform any necessary UNDO operations. The recovery code does 715 * call hammer_undo_lookup() so we have to pre-cache the blockmap, 716 * and then re-copy it again after recovery is complete. 717 * 718 * If this is a read-only mount the UNDO information is retained 719 * in memory in the form of dirty buffer cache buffers, and not 720 * written back to the media. 721 */ 722 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, 723 sizeof(hmp->blockmap)); 724 725 /* 726 * Check filesystem version 727 */ 728 hmp->version = rootvol->ondisk->vol_version; 729 if (hmp->version < HAMMER_VOL_VERSION_MIN || 730 hmp->version > HAMMER_VOL_VERSION_MAX) { 731 kprintf("HAMMER: mount unsupported fs version %d\n", 732 hmp->version); 733 error = ERANGE; 734 goto done; 735 } 736 737 /* 738 * The undo_rec_limit limits the size of flush groups to avoid 739 * blowing out the UNDO FIFO. This calculation is typically in 740 * the tens of thousands and is designed primarily when small 741 * HAMMER filesystems are created. 742 */ 743 hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100; 744 if (hammer_debug_general & 0x0001) 745 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit); 746 747 /* 748 * NOTE: Recover stage1 not only handles meta-data recovery, it 749 * also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems. 750 */ 751 error = hammer_recover_stage1(hmp, rootvol); 752 if (error) { 753 kprintf("Failed to recover HAMMER filesystem on mount\n"); 754 goto done; 755 } 756 757 /* 758 * Finish setup now that we have a good root volume. 759 * 760 * The top 16 bits of fsid.val[1] is a pfs id. 761 */ 762 ksnprintf(mp->mnt_stat.f_mntfromname, 763 sizeof(mp->mnt_stat.f_mntfromname), "%s", 764 rootvol->ondisk->vol_name); 765 mp->mnt_stat.f_fsid.val[0] = 766 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8); 767 mp->mnt_stat.f_fsid.val[1] = 768 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8); 769 mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF; 770 771 mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid; 772 mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid, 773 sizeof(mp->mnt_vstat.f_fsid_uuid)); 774 775 /* 776 * Certain often-modified fields in the root volume are cached in 777 * the hammer_mount structure so we do not have to generate lots 778 * of little UNDO structures for them. 779 * 780 * Recopy after recovery. This also has the side effect of 781 * setting our cached undo FIFO's first_offset, which serves to 782 * placemark the FIFO start for the NEXT flush cycle while the 783 * on-disk first_offset represents the LAST flush cycle. 784 */ 785 hmp->next_tid = rootvol->ondisk->vol0_next_tid; 786 hmp->flush_tid1 = hmp->next_tid; 787 hmp->flush_tid2 = hmp->next_tid; 788 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, 789 sizeof(hmp->blockmap)); 790 hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks; 791 792 hammer_flusher_create(hmp); 793 794 /* 795 * Locate the root directory with an obj_id of 1. 796 */ 797 error = hammer_vfs_vget(mp, NULL, HAMMER_OBJID_ROOT, &rootvp); 798 if (error) 799 goto done; 800 vput(rootvp); 801 if (hmp->ronly == 0) 802 error = hammer_recover_stage2(hmp, rootvol); 803 804 /* 805 * If the stage2 recovery fails be sure to clean out all cached 806 * vnodes before throwing away the mount structure or bad things 807 * will happen. 808 */ 809 if (error) 810 vflush(mp, 0, 0); 811 812 done: 813 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 814 /* New mount */ 815 816 /* Populate info for mount point (NULL pad)*/ 817 bzero(mp->mnt_stat.f_mntonname, MNAMELEN); 818 size_t size; 819 if (mntpt) { 820 copyinstr(mntpt, mp->mnt_stat.f_mntonname, 821 MNAMELEN -1, &size); 822 } else { /* Root mount */ 823 mp->mnt_stat.f_mntonname[0] = '/'; 824 } 825 } 826 (void)VFS_STATFS(mp, &mp->mnt_stat, cred); 827 hammer_rel_volume(rootvol, 0); 828 failed: 829 /* 830 * Cleanup and return. 831 */ 832 if (error) { 833 /* called with fs_token held */ 834 hammer_free_hmp(mp); 835 } else { 836 lwkt_reltoken(&hmp->fs_token); 837 } 838 return (error); 839 } 840 841 static int 842 hammer_vfs_unmount(struct mount *mp, int mntflags) 843 { 844 hammer_mount_t hmp = (void *)mp->mnt_data; 845 int flags; 846 int error; 847 848 /* 849 * Clean out the vnodes 850 */ 851 lwkt_gettoken(&hmp->fs_token); 852 flags = 0; 853 if (mntflags & MNT_FORCE) 854 flags |= FORCECLOSE; 855 error = vflush(mp, 0, flags); 856 857 /* 858 * Clean up the internal mount structure and related entities. This 859 * may issue I/O. 860 */ 861 if (error == 0) { 862 /* called with fs_token held */ 863 hammer_free_hmp(mp); 864 } else { 865 lwkt_reltoken(&hmp->fs_token); 866 } 867 return(error); 868 } 869 870 /* 871 * Clean up the internal mount structure and disassociate it from the mount. 872 * This may issue I/O. 873 * 874 * Called with fs_token held. 875 */ 876 static void 877 hammer_free_hmp(struct mount *mp) 878 { 879 hammer_mount_t hmp = (void *)mp->mnt_data; 880 hammer_flush_group_t flg; 881 882 /* 883 * Flush anything dirty. This won't even run if the 884 * filesystem errored-out. 885 */ 886 hammer_flush_dirty(hmp, 30); 887 888 /* 889 * If the mount had a critical error we have to destroy any 890 * remaining inodes before we can finish cleaning up the flusher. 891 */ 892 if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) { 893 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 894 hammer_destroy_inode_callback, NULL); 895 } 896 897 /* 898 * There shouldn't be any inodes left now and any left over 899 * flush groups should now be empty. 900 */ 901 KKASSERT(RB_EMPTY(&hmp->rb_inos_root)); 902 while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) { 903 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry); 904 KKASSERT(RB_EMPTY(&flg->flush_tree)); 905 if (flg->refs) { 906 kprintf("HAMMER: Warning, flush_group %p was " 907 "not empty on umount!\n", flg); 908 } 909 kfree(flg, hmp->m_misc); 910 } 911 912 /* 913 * We can finally destroy the flusher 914 */ 915 hammer_flusher_destroy(hmp); 916 917 /* 918 * We may have held recovered buffers due to a read-only mount. 919 * These must be discarded. 920 */ 921 if (hmp->ronly) 922 hammer_recover_flush_buffers(hmp, NULL, -1); 923 924 /* 925 * Unload buffers and then volumes 926 */ 927 RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL, 928 hammer_unload_buffer, NULL); 929 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 930 hammer_unload_volume, NULL); 931 932 mp->mnt_data = NULL; 933 mp->mnt_flag &= ~MNT_LOCAL; 934 hmp->mp = NULL; 935 hammer_destroy_objid_cache(hmp); 936 hammer_destroy_dedup_cache(hmp); 937 if (hmp->dedup_free_cache != NULL) { 938 kfree(hmp->dedup_free_cache, hmp->m_misc); 939 hmp->dedup_free_cache = NULL; 940 } 941 kmalloc_destroy(&hmp->m_misc); 942 kmalloc_destroy(&hmp->m_inodes); 943 lwkt_reltoken(&hmp->fs_token); 944 kfree(hmp, M_HAMMER); 945 } 946 947 /* 948 * Report critical errors. ip may be NULL. 949 */ 950 void 951 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip, 952 int error, const char *msg) 953 { 954 hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR; 955 956 krateprintf(&hmp->krate, 957 "HAMMER(%s): Critical error inode=%jd error=%d %s\n", 958 hmp->mp->mnt_stat.f_mntfromname, 959 (intmax_t)(ip ? ip->obj_id : -1), 960 error, msg); 961 962 if (hmp->ronly == 0) { 963 hmp->ronly = 2; /* special errored read-only mode */ 964 hmp->mp->mnt_flag |= MNT_RDONLY; 965 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 966 hammer_adjust_volume_mode, NULL); 967 kprintf("HAMMER(%s): Forcing read-only mode\n", 968 hmp->mp->mnt_stat.f_mntfromname); 969 } 970 hmp->error = error; 971 if (hammer_debug_critical) 972 Debugger("Entering debugger"); 973 } 974 975 976 /* 977 * Obtain a vnode for the specified inode number. An exclusively locked 978 * vnode is returned. 979 */ 980 int 981 hammer_vfs_vget(struct mount *mp, struct vnode *dvp, 982 ino_t ino, struct vnode **vpp) 983 { 984 struct hammer_transaction trans; 985 struct hammer_mount *hmp = (void *)mp->mnt_data; 986 struct hammer_inode *ip; 987 int error; 988 u_int32_t localization; 989 990 lwkt_gettoken(&hmp->fs_token); 991 hammer_simple_transaction(&trans, hmp); 992 993 /* 994 * If a directory vnode is supplied (mainly NFS) then we can acquire 995 * the PFS domain from it. Otherwise we would only be able to vget 996 * inodes in the root PFS. 997 */ 998 if (dvp) { 999 localization = HAMMER_DEF_LOCALIZATION + 1000 VTOI(dvp)->obj_localization; 1001 } else { 1002 localization = HAMMER_DEF_LOCALIZATION; 1003 } 1004 1005 /* 1006 * Lookup the requested HAMMER inode. The structure must be 1007 * left unlocked while we manipulate the related vnode to avoid 1008 * a deadlock. 1009 */ 1010 ip = hammer_get_inode(&trans, NULL, ino, 1011 hmp->asof, localization, 1012 0, &error); 1013 if (ip == NULL) { 1014 *vpp = NULL; 1015 } else { 1016 error = hammer_get_vnode(ip, vpp); 1017 hammer_rel_inode(ip, 0); 1018 } 1019 hammer_done_transaction(&trans); 1020 lwkt_reltoken(&hmp->fs_token); 1021 return (error); 1022 } 1023 1024 /* 1025 * Return the root vnode for the filesystem. 1026 * 1027 * HAMMER stores the root vnode in the hammer_mount structure so 1028 * getting it is easy. 1029 */ 1030 static int 1031 hammer_vfs_root(struct mount *mp, struct vnode **vpp) 1032 { 1033 int error; 1034 1035 error = hammer_vfs_vget(mp, NULL, HAMMER_OBJID_ROOT, vpp); 1036 return (error); 1037 } 1038 1039 static int 1040 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 1041 { 1042 struct hammer_mount *hmp = (void *)mp->mnt_data; 1043 hammer_volume_t volume; 1044 hammer_volume_ondisk_t ondisk; 1045 int error; 1046 int64_t bfree; 1047 int64_t breserved; 1048 1049 lwkt_gettoken(&hmp->fs_token); 1050 volume = hammer_get_root_volume(hmp, &error); 1051 if (error) { 1052 lwkt_reltoken(&hmp->fs_token); 1053 return(error); 1054 } 1055 ondisk = volume->ondisk; 1056 1057 /* 1058 * Basic stats 1059 */ 1060 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved); 1061 mp->mnt_stat.f_files = ondisk->vol0_stat_inodes; 1062 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_BIGBLOCK_SIZE; 1063 hammer_rel_volume(volume, 0); 1064 1065 mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE; 1066 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree; 1067 if (mp->mnt_stat.f_files < 0) 1068 mp->mnt_stat.f_files = 0; 1069 1070 *sbp = mp->mnt_stat; 1071 lwkt_reltoken(&hmp->fs_token); 1072 return(0); 1073 } 1074 1075 static int 1076 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 1077 { 1078 struct hammer_mount *hmp = (void *)mp->mnt_data; 1079 hammer_volume_t volume; 1080 hammer_volume_ondisk_t ondisk; 1081 int error; 1082 int64_t bfree; 1083 int64_t breserved; 1084 1085 lwkt_gettoken(&hmp->fs_token); 1086 volume = hammer_get_root_volume(hmp, &error); 1087 if (error) { 1088 lwkt_reltoken(&hmp->fs_token); 1089 return(error); 1090 } 1091 ondisk = volume->ondisk; 1092 1093 /* 1094 * Basic stats 1095 */ 1096 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved); 1097 mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes; 1098 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_BIGBLOCK_SIZE; 1099 hammer_rel_volume(volume, 0); 1100 1101 mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE; 1102 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree; 1103 if (mp->mnt_vstat.f_files < 0) 1104 mp->mnt_vstat.f_files = 0; 1105 *sbp = mp->mnt_vstat; 1106 lwkt_reltoken(&hmp->fs_token); 1107 return(0); 1108 } 1109 1110 /* 1111 * Sync the filesystem. Currently we have to run it twice, the second 1112 * one will advance the undo start index to the end index, so if a crash 1113 * occurs no undos will be run on mount. 1114 * 1115 * We do not sync the filesystem if we are called from a panic. If we did 1116 * we might end up blowing up a sync that was already in progress. 1117 */ 1118 static int 1119 hammer_vfs_sync(struct mount *mp, int waitfor) 1120 { 1121 struct hammer_mount *hmp = (void *)mp->mnt_data; 1122 int error; 1123 1124 lwkt_gettoken(&hmp->fs_token); 1125 if (panicstr == NULL) { 1126 error = hammer_sync_hmp(hmp, waitfor); 1127 } else { 1128 error = EIO; 1129 } 1130 lwkt_reltoken(&hmp->fs_token); 1131 return (error); 1132 } 1133 1134 /* 1135 * Convert a vnode to a file handle. 1136 * 1137 * Accesses read-only fields on already-referenced structures so 1138 * no token is needed. 1139 */ 1140 static int 1141 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp) 1142 { 1143 hammer_inode_t ip; 1144 1145 KKASSERT(MAXFIDSZ >= 16); 1146 ip = VTOI(vp); 1147 fhp->fid_len = offsetof(struct fid, fid_data[16]); 1148 fhp->fid_ext = ip->obj_localization >> 16; 1149 bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id)); 1150 bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof)); 1151 return(0); 1152 } 1153 1154 1155 /* 1156 * Convert a file handle back to a vnode. 1157 * 1158 * Use rootvp to enforce PFS isolation when a PFS is exported via a 1159 * null mount. 1160 */ 1161 static int 1162 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 1163 struct fid *fhp, struct vnode **vpp) 1164 { 1165 hammer_mount_t hmp = (void *)mp->mnt_data; 1166 struct hammer_transaction trans; 1167 struct hammer_inode *ip; 1168 struct hammer_inode_info info; 1169 int error; 1170 u_int32_t localization; 1171 1172 bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id)); 1173 bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof)); 1174 if (rootvp) 1175 localization = VTOI(rootvp)->obj_localization; 1176 else 1177 localization = (u_int32_t)fhp->fid_ext << 16; 1178 1179 lwkt_gettoken(&hmp->fs_token); 1180 hammer_simple_transaction(&trans, hmp); 1181 1182 /* 1183 * Get/allocate the hammer_inode structure. The structure must be 1184 * unlocked while we manipulate the related vnode to avoid a 1185 * deadlock. 1186 */ 1187 ip = hammer_get_inode(&trans, NULL, info.obj_id, 1188 info.obj_asof, localization, 0, &error); 1189 if (ip) { 1190 error = hammer_get_vnode(ip, vpp); 1191 hammer_rel_inode(ip, 0); 1192 } else { 1193 *vpp = NULL; 1194 } 1195 hammer_done_transaction(&trans); 1196 lwkt_reltoken(&hmp->fs_token); 1197 return (error); 1198 } 1199 1200 static int 1201 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 1202 int *exflagsp, struct ucred **credanonp) 1203 { 1204 hammer_mount_t hmp = (void *)mp->mnt_data; 1205 struct netcred *np; 1206 int error; 1207 1208 lwkt_gettoken(&hmp->fs_token); 1209 np = vfs_export_lookup(mp, &hmp->export, nam); 1210 if (np) { 1211 *exflagsp = np->netc_exflags; 1212 *credanonp = &np->netc_anon; 1213 error = 0; 1214 } else { 1215 error = EACCES; 1216 } 1217 lwkt_reltoken(&hmp->fs_token); 1218 return (error); 1219 1220 } 1221 1222 int 1223 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export) 1224 { 1225 hammer_mount_t hmp = (void *)mp->mnt_data; 1226 int error; 1227 1228 lwkt_gettoken(&hmp->fs_token); 1229 1230 switch(op) { 1231 case MOUNTCTL_SET_EXPORT: 1232 error = vfs_export(mp, &hmp->export, export); 1233 break; 1234 default: 1235 error = EOPNOTSUPP; 1236 break; 1237 } 1238 lwkt_reltoken(&hmp->fs_token); 1239 1240 return(error); 1241 } 1242 1243