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/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/vnode.h> 39 #include <sys/mount.h> 40 #include <sys/malloc.h> 41 #include <sys/nlookup.h> 42 #include <sys/fcntl.h> 43 #include <sys/sysctl.h> 44 #include <sys/buf.h> 45 #include <sys/buf2.h> 46 #include "hammer.h" 47 48 /* 49 * NOTE! Global statistics may not be MPSAFE so HAMMER never uses them 50 * in conditionals. 51 */ 52 int hammer_supported_version = HAMMER_VOL_VERSION_DEFAULT; 53 int hammer_debug_io; 54 int hammer_debug_general; 55 int hammer_debug_debug = 1; /* medium-error panics */ 56 int hammer_debug_inode; 57 int hammer_debug_locks; 58 int hammer_debug_btree; 59 int hammer_debug_tid; 60 int hammer_debug_recover; /* -1 will disable, +1 will force */ 61 int hammer_debug_recover_faults; 62 int hammer_debug_critical; /* non-zero enter debugger on error */ 63 int hammer_cluster_enable = 1; /* enable read clustering by default */ 64 int hammer_live_dedup = 0; 65 int hammer_tdmux_ticks; 66 int hammer_count_fsyncs; 67 int hammer_count_inodes; 68 int hammer_count_iqueued; 69 int hammer_count_reclaims; 70 int hammer_count_records; 71 int hammer_count_record_datas; 72 int hammer_count_volumes; 73 int hammer_count_buffers; 74 int hammer_count_nodes; 75 int64_t hammer_count_extra_space_used; 76 int64_t hammer_stats_btree_lookups; 77 int64_t hammer_stats_btree_searches; 78 int64_t hammer_stats_btree_inserts; 79 int64_t hammer_stats_btree_deletes; 80 int64_t hammer_stats_btree_elements; 81 int64_t hammer_stats_btree_splits; 82 int64_t hammer_stats_btree_iterations; 83 int64_t hammer_stats_btree_root_iterations; 84 int64_t hammer_stats_record_iterations; 85 86 int64_t hammer_stats_file_read; 87 int64_t hammer_stats_file_write; 88 int64_t hammer_stats_file_iopsr; 89 int64_t hammer_stats_file_iopsw; 90 int64_t hammer_stats_disk_read; 91 int64_t hammer_stats_disk_write; 92 int64_t hammer_stats_inode_flushes; 93 int64_t hammer_stats_commits; 94 int64_t hammer_stats_undo; 95 int64_t hammer_stats_redo; 96 97 long hammer_count_dirtybufspace; /* global */ 98 int hammer_count_refedbufs; /* global */ 99 int hammer_count_reservations; 100 long hammer_count_io_running_read; 101 long hammer_count_io_running_write; 102 int hammer_count_io_locked; 103 long hammer_limit_dirtybufspace; /* per-mount */ 104 int hammer_limit_recs; /* as a whole XXX */ 105 int hammer_limit_inode_recs = 2048; /* per inode */ 106 int hammer_limit_reclaims; 107 int hammer_live_dedup_cache_size = DEDUP_CACHE_SIZE; 108 int hammer_limit_redo = 4096 * 1024; /* per inode */ 109 int hammer_autoflush = 500; /* auto flush (typ on reclaim) */ 110 int hammer_bio_count; 111 int hammer_verify_zone; 112 int hammer_verify_data = 1; 113 int hammer_write_mode; 114 int hammer_double_buffer; 115 int hammer_btree_full_undo = 1; 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 * LIVE_DEDUP IS DISABLED PERMANENTLY! This feature appears to cause 163 * blockmap corruption over time so we've turned it off permanently. 164 */ 165 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup, CTLFLAG_RD, 166 &hammer_live_dedup, 0, "Enable live dedup (experimental)"); 167 SYSCTL_INT(_vfs_hammer, OID_AUTO, tdmux_ticks, CTLFLAG_RW, 168 &hammer_tdmux_ticks, 0, "Hammer tdmux ticks"); 169 170 SYSCTL_LONG(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW, 171 &hammer_limit_dirtybufspace, 0, ""); 172 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW, 173 &hammer_limit_recs, 0, ""); 174 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW, 175 &hammer_limit_inode_recs, 0, ""); 176 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaims, CTLFLAG_RW, 177 &hammer_limit_reclaims, 0, ""); 178 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup_cache_size, CTLFLAG_RW, 179 &hammer_live_dedup_cache_size, 0, 180 "Number of cache entries"); 181 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW, 182 &hammer_limit_redo, 0, ""); 183 184 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD, 185 &hammer_count_fsyncs, 0, ""); 186 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD, 187 &hammer_count_inodes, 0, ""); 188 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD, 189 &hammer_count_iqueued, 0, ""); 190 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaims, CTLFLAG_RD, 191 &hammer_count_reclaims, 0, ""); 192 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD, 193 &hammer_count_records, 0, ""); 194 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD, 195 &hammer_count_record_datas, 0, ""); 196 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD, 197 &hammer_count_volumes, 0, ""); 198 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD, 199 &hammer_count_buffers, 0, ""); 200 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD, 201 &hammer_count_nodes, 0, ""); 202 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD, 203 &hammer_count_extra_space_used, 0, ""); 204 205 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD, 206 &hammer_stats_btree_searches, 0, ""); 207 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD, 208 &hammer_stats_btree_lookups, 0, ""); 209 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD, 210 &hammer_stats_btree_inserts, 0, ""); 211 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD, 212 &hammer_stats_btree_deletes, 0, ""); 213 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD, 214 &hammer_stats_btree_elements, 0, ""); 215 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD, 216 &hammer_stats_btree_splits, 0, ""); 217 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD, 218 &hammer_stats_btree_iterations, 0, ""); 219 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD, 220 &hammer_stats_btree_root_iterations, 0, ""); 221 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD, 222 &hammer_stats_record_iterations, 0, ""); 223 224 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD, 225 &hammer_stats_file_read, 0, ""); 226 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD, 227 &hammer_stats_file_write, 0, ""); 228 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD, 229 &hammer_stats_file_iopsr, 0, ""); 230 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD, 231 &hammer_stats_file_iopsw, 0, ""); 232 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD, 233 &hammer_stats_disk_read, 0, ""); 234 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD, 235 &hammer_stats_disk_write, 0, ""); 236 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD, 237 &hammer_stats_inode_flushes, 0, ""); 238 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD, 239 &hammer_stats_commits, 0, ""); 240 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD, 241 &hammer_stats_undo, 0, ""); 242 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD, 243 &hammer_stats_redo, 0, ""); 244 245 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_vnode_bcmps, CTLFLAG_RW, 246 &hammer_live_dedup_vnode_bcmps, 0, 247 "successful vnode buffer comparisons"); 248 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_device_bcmps, CTLFLAG_RW, 249 &hammer_live_dedup_device_bcmps, 0, 250 "successful device buffer comparisons"); 251 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_findblk_failures, CTLFLAG_RW, 252 &hammer_live_dedup_findblk_failures, 0, 253 "block lookup failures for comparison"); 254 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_bmap_saves, CTLFLAG_RW, 255 &hammer_live_dedup_bmap_saves, 0, 256 "useful physical block lookups"); 257 258 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD, 259 &hammer_count_dirtybufspace, 0, ""); 260 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD, 261 &hammer_count_refedbufs, 0, ""); 262 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD, 263 &hammer_count_reservations, 0, ""); 264 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD, 265 &hammer_count_io_running_read, 0, ""); 266 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD, 267 &hammer_count_io_locked, 0, ""); 268 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD, 269 &hammer_count_io_running_write, 0, ""); 270 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW, 271 &hammer_zone_limit, 0, ""); 272 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW, 273 &hammer_contention_count, 0, ""); 274 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW, 275 &hammer_autoflush, 0, ""); 276 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW, 277 &hammer_verify_zone, 0, ""); 278 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW, 279 &hammer_verify_data, 0, ""); 280 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW, 281 &hammer_write_mode, 0, ""); 282 SYSCTL_INT(_vfs_hammer, OID_AUTO, double_buffer, CTLFLAG_RW, 283 &hammer_double_buffer, 0, ""); 284 SYSCTL_INT(_vfs_hammer, OID_AUTO, btree_full_undo, CTLFLAG_RW, 285 &hammer_btree_full_undo, 0, ""); 286 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW, 287 &hammer_yield_check, 0, ""); 288 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW, 289 &hammer_fsync_mode, 0, ""); 290 291 /* KTR_INFO_MASTER(hammer); */ 292 293 /* 294 * VFS ABI 295 */ 296 static void hammer_free_hmp(struct mount *mp); 297 298 static int hammer_vfs_mount(struct mount *mp, char *path, caddr_t data, 299 struct ucred *cred); 300 static int hammer_vfs_unmount(struct mount *mp, int mntflags); 301 static int hammer_vfs_root(struct mount *mp, struct vnode **vpp); 302 static int hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, 303 struct ucred *cred); 304 static int hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, 305 struct ucred *cred); 306 static int hammer_vfs_sync(struct mount *mp, int waitfor); 307 static int hammer_vfs_vget(struct mount *mp, struct vnode *dvp, 308 ino_t ino, struct vnode **vpp); 309 static int hammer_vfs_init(struct vfsconf *conf); 310 static int hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 311 struct fid *fhp, struct vnode **vpp); 312 static int hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp); 313 static int hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 314 int *exflagsp, struct ucred **credanonp); 315 316 317 static struct vfsops hammer_vfsops = { 318 .vfs_mount = hammer_vfs_mount, 319 .vfs_unmount = hammer_vfs_unmount, 320 .vfs_root = hammer_vfs_root, 321 .vfs_statfs = hammer_vfs_statfs, 322 .vfs_statvfs = hammer_vfs_statvfs, 323 .vfs_sync = hammer_vfs_sync, 324 .vfs_vget = hammer_vfs_vget, 325 .vfs_init = hammer_vfs_init, 326 .vfs_vptofh = hammer_vfs_vptofh, 327 .vfs_fhtovp = hammer_vfs_fhtovp, 328 .vfs_checkexp = hammer_vfs_checkexp 329 }; 330 331 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", ""); 332 333 VFS_SET(hammer_vfsops, hammer, 0); 334 MODULE_VERSION(hammer, 1); 335 336 static int 337 hammer_vfs_init(struct vfsconf *conf) 338 { 339 long n; 340 341 /* 342 * Wait up to this long for an exclusive deadlock to clear 343 * before acquiring a new shared lock on the ip. The deadlock 344 * may have occured on a b-tree node related to the ip. 345 */ 346 if (hammer_tdmux_ticks == 0) 347 hammer_tdmux_ticks = hz / 5; 348 349 /* 350 * Autosize, but be careful because a hammer filesystem's 351 * reserve is partially calculated based on dirtybufspace, 352 * so we simply cannot allow it to get too large. 353 */ 354 if (hammer_limit_recs == 0) { 355 n = nbuf * 25; 356 if (n > kmalloc_limit(M_HAMMER) / 512) 357 n = kmalloc_limit(M_HAMMER) / 512; 358 if (n > 2 * 1024 * 1024) 359 n = 2 * 1024 * 1024; 360 hammer_limit_recs = (int)n; 361 } 362 if (hammer_limit_dirtybufspace == 0) { 363 hammer_limit_dirtybufspace = hidirtybufspace / 2; 364 if (hammer_limit_dirtybufspace < 1L * 1024 * 1024) 365 hammer_limit_dirtybufspace = 1024L * 1024; 366 if (hammer_limit_dirtybufspace > 1024L * 1024 * 1024) 367 hammer_limit_dirtybufspace = 1024L * 1024 * 1024; 368 } 369 370 /* 371 * The hammer_inode structure detaches from the vnode on reclaim. 372 * This limits the number of inodes in this state to prevent a 373 * memory pool blowout. 374 */ 375 if (hammer_limit_reclaims == 0) 376 hammer_limit_reclaims = desiredvnodes / 10; 377 378 return(0); 379 } 380 381 static int 382 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data, 383 struct ucred *cred) 384 { 385 struct hammer_mount_info info; 386 hammer_mount_t hmp; 387 hammer_volume_t rootvol; 388 struct vnode *rootvp; 389 struct vnode *devvp = NULL; 390 const char *upath; /* volume name in userspace */ 391 char *path; /* volume name in system space */ 392 int error; 393 int i; 394 int master_id; 395 char *next_volume_ptr = NULL; 396 397 /* 398 * Accept hammer_mount_info. mntpt is NULL for root mounts at boot. 399 */ 400 if (mntpt == NULL) { 401 bzero(&info, sizeof(info)); 402 info.asof = 0; 403 info.hflags = 0; 404 info.nvolumes = 1; 405 406 next_volume_ptr = mp->mnt_stat.f_mntfromname; 407 408 /* Count number of volumes separated by ':' */ 409 for (char *p = next_volume_ptr; *p != '\0'; ++p) { 410 if (*p == ':') { 411 ++info.nvolumes; 412 } 413 } 414 415 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */ 416 } else { 417 if ((error = copyin(data, &info, sizeof(info))) != 0) 418 return (error); 419 } 420 421 /* 422 * updating or new mount 423 */ 424 if (mp->mnt_flag & MNT_UPDATE) { 425 hmp = (void *)mp->mnt_data; 426 KKASSERT(hmp != NULL); 427 } else { 428 if (info.nvolumes <= 0 || info.nvolumes > HAMMER_MAX_VOLUMES) 429 return (EINVAL); 430 hmp = NULL; 431 } 432 433 /* 434 * master-id validation. The master id may not be changed by a 435 * mount update. 436 */ 437 if (info.hflags & HMNT_MASTERID) { 438 if (hmp && hmp->master_id != info.master_id) { 439 kprintf("hammer: cannot change master id " 440 "with mount update\n"); 441 return(EINVAL); 442 } 443 master_id = info.master_id; 444 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS) 445 return (EINVAL); 446 } else { 447 if (hmp) 448 master_id = hmp->master_id; 449 else 450 master_id = 0; 451 } 452 453 /* 454 * Internal mount data structure 455 */ 456 if (hmp == NULL) { 457 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO); 458 mp->mnt_data = (qaddr_t)hmp; 459 hmp->mp = mp; 460 /*TAILQ_INIT(&hmp->recycle_list);*/ 461 462 /* 463 * Make sure kmalloc type limits are set appropriately. 464 * 465 * Our inode kmalloc group is sized based on maxvnodes 466 * (controlled by the system, not us). 467 */ 468 kmalloc_create(&hmp->m_misc, "HAMMER-others"); 469 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes"); 470 471 kmalloc_raise_limit(hmp->m_inodes, 0); /* unlimited */ 472 473 hmp->root_btree_beg.localization = 0x00000000U; 474 hmp->root_btree_beg.obj_id = -0x8000000000000000LL; 475 hmp->root_btree_beg.key = -0x8000000000000000LL; 476 hmp->root_btree_beg.create_tid = 1; 477 hmp->root_btree_beg.delete_tid = 1; 478 hmp->root_btree_beg.rec_type = 0; 479 hmp->root_btree_beg.obj_type = 0; 480 481 hmp->root_btree_end.localization = 0xFFFFFFFFU; 482 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL; 483 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL; 484 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL; 485 hmp->root_btree_end.delete_tid = 0; /* special case */ 486 hmp->root_btree_end.rec_type = 0xFFFFU; 487 hmp->root_btree_end.obj_type = 0; 488 489 hmp->krate.freq = 1; /* maximum reporting rate (hz) */ 490 hmp->krate.count = -16; /* initial burst */ 491 492 hmp->sync_lock.refs = 1; 493 hmp->free_lock.refs = 1; 494 hmp->undo_lock.refs = 1; 495 hmp->blkmap_lock.refs = 1; 496 hmp->snapshot_lock.refs = 1; 497 hmp->volume_lock.refs = 1; 498 499 TAILQ_INIT(&hmp->delay_list); 500 TAILQ_INIT(&hmp->flush_group_list); 501 TAILQ_INIT(&hmp->objid_cache_list); 502 TAILQ_INIT(&hmp->undo_lru_list); 503 TAILQ_INIT(&hmp->reclaim_list); 504 505 RB_INIT(&hmp->rb_dedup_crc_root); 506 RB_INIT(&hmp->rb_dedup_off_root); 507 TAILQ_INIT(&hmp->dedup_lru_list); 508 } 509 hmp->hflags &= ~HMNT_USERFLAGS; 510 hmp->hflags |= info.hflags & HMNT_USERFLAGS; 511 512 hmp->master_id = master_id; 513 514 if (info.asof) { 515 mp->mnt_flag |= MNT_RDONLY; 516 hmp->asof = info.asof; 517 } else { 518 hmp->asof = HAMMER_MAX_TID; 519 } 520 521 hmp->volume_to_remove = -1; 522 523 /* 524 * Re-open read-write if originally read-only, or vise-versa. 525 * 526 * When going from read-only to read-write execute the stage2 527 * recovery if it has not already been run. 528 */ 529 if (mp->mnt_flag & MNT_UPDATE) { 530 lwkt_gettoken(&hmp->fs_token); 531 error = 0; 532 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 533 kprintf("HAMMER read-only -> read-write\n"); 534 hmp->ronly = 0; 535 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 536 hammer_adjust_volume_mode, NULL); 537 rootvol = hammer_get_root_volume(hmp, &error); 538 if (rootvol) { 539 hammer_recover_flush_buffers(hmp, rootvol, 1); 540 error = hammer_recover_stage2(hmp, rootvol); 541 bcopy(rootvol->ondisk->vol0_blockmap, 542 hmp->blockmap, 543 sizeof(hmp->blockmap)); 544 hammer_rel_volume(rootvol, 0); 545 } 546 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 547 hammer_reload_inode, NULL); 548 /* kernel clears MNT_RDONLY */ 549 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 550 kprintf("HAMMER read-write -> read-only\n"); 551 hmp->ronly = 1; /* messy */ 552 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 553 hammer_reload_inode, NULL); 554 hmp->ronly = 0; 555 hammer_flusher_sync(hmp); 556 hammer_flusher_sync(hmp); 557 hammer_flusher_sync(hmp); 558 hmp->ronly = 1; 559 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 560 hammer_adjust_volume_mode, NULL); 561 } 562 lwkt_reltoken(&hmp->fs_token); 563 return(error); 564 } 565 566 RB_INIT(&hmp->rb_vols_root); 567 RB_INIT(&hmp->rb_inos_root); 568 RB_INIT(&hmp->rb_redo_root); 569 RB_INIT(&hmp->rb_nods_root); 570 RB_INIT(&hmp->rb_undo_root); 571 RB_INIT(&hmp->rb_resv_root); 572 RB_INIT(&hmp->rb_bufs_root); 573 RB_INIT(&hmp->rb_pfsm_root); 574 575 hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); 576 577 RB_INIT(&hmp->volu_root); 578 RB_INIT(&hmp->undo_root); 579 RB_INIT(&hmp->data_root); 580 RB_INIT(&hmp->meta_root); 581 RB_INIT(&hmp->lose_root); 582 TAILQ_INIT(&hmp->iorun_list); 583 584 lwkt_token_init(&hmp->fs_token, "hammerfs"); 585 lwkt_token_init(&hmp->io_token, "hammerio"); 586 587 lwkt_gettoken(&hmp->fs_token); 588 589 /* 590 * Load volumes 591 */ 592 path = objcache_get(namei_oc, M_WAITOK); 593 hmp->nvolumes = -1; 594 for (i = 0; i < info.nvolumes; ++i) { 595 if (mntpt == NULL) { 596 /* 597 * Root mount. 598 */ 599 KKASSERT(next_volume_ptr != NULL); 600 strcpy(path, ""); 601 if (*next_volume_ptr != '/') { 602 /* relative path */ 603 strcpy(path, "/dev/"); 604 } 605 int k; 606 for (k = strlen(path); k < MAXPATHLEN-1; ++k) { 607 if (*next_volume_ptr == '\0') { 608 break; 609 } else if (*next_volume_ptr == ':') { 610 ++next_volume_ptr; 611 break; 612 } else { 613 path[k] = *next_volume_ptr; 614 ++next_volume_ptr; 615 } 616 } 617 path[k] = '\0'; 618 619 error = 0; 620 cdev_t dev = kgetdiskbyname(path); 621 error = bdevvp(dev, &devvp); 622 if (error) { 623 kprintf("hammer_mountroot: can't find devvp\n"); 624 } 625 } else { 626 error = copyin(&info.volumes[i], &upath, 627 sizeof(char *)); 628 if (error == 0) 629 error = copyinstr(upath, path, 630 MAXPATHLEN, NULL); 631 } 632 if (error == 0) 633 error = hammer_install_volume(hmp, path, devvp); 634 if (error) 635 break; 636 } 637 objcache_put(namei_oc, path); 638 639 /* 640 * Make sure we found a root volume 641 */ 642 if (error == 0 && hmp->rootvol == NULL) { 643 kprintf("hammer_mount: No root volume found!\n"); 644 error = EINVAL; 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 } 654 655 if (error) { 656 /* called with fs_token held */ 657 hammer_free_hmp(mp); 658 return (error); 659 } 660 661 /* 662 * No errors, setup enough of the mount point so we can lookup the 663 * root vnode. 664 */ 665 mp->mnt_iosize_max = MAXPHYS; 666 mp->mnt_kern_flag |= MNTK_FSMID; 667 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */ 668 669 /* 670 * MPSAFE code. Note that VOPs and VFSops which are not MPSAFE 671 * will acquire a per-mount token prior to entry and release it 672 * on return, so even if we do not specify it we no longer get 673 * the BGL regardlless of how we are flagged. 674 */ 675 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; 676 /*MNTK_RD_MPSAFE | MNTK_GA_MPSAFE | MNTK_IN_MPSAFE;*/ 677 678 /* 679 * note: f_iosize is used by vnode_pager_haspage() when constructing 680 * its VOP_BMAP call. 681 */ 682 mp->mnt_stat.f_iosize = HAMMER_BUFSIZE; 683 mp->mnt_stat.f_bsize = HAMMER_BUFSIZE; 684 685 mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE; 686 mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE; 687 688 mp->mnt_maxsymlinklen = 255; 689 mp->mnt_flag |= MNT_LOCAL; 690 691 vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops); 692 vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops); 693 vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops); 694 695 /* 696 * The root volume's ondisk pointer is only valid if we hold a 697 * reference to it. 698 */ 699 rootvol = hammer_get_root_volume(hmp, &error); 700 if (error) 701 goto failed; 702 703 /* 704 * Perform any necessary UNDO operations. The recovery code does 705 * call hammer_undo_lookup() so we have to pre-cache the blockmap, 706 * and then re-copy it again after recovery is complete. 707 * 708 * If this is a read-only mount the UNDO information is retained 709 * in memory in the form of dirty buffer cache buffers, and not 710 * written back to the media. 711 */ 712 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, 713 sizeof(hmp->blockmap)); 714 715 /* 716 * Check filesystem version 717 */ 718 hmp->version = rootvol->ondisk->vol_version; 719 if (hmp->version < HAMMER_VOL_VERSION_MIN || 720 hmp->version > HAMMER_VOL_VERSION_MAX) { 721 kprintf("HAMMER: mount unsupported fs version %d\n", 722 hmp->version); 723 error = ERANGE; 724 goto done; 725 } 726 727 /* 728 * The undo_rec_limit limits the size of flush groups to avoid 729 * blowing out the UNDO FIFO. This calculation is typically in 730 * the tens of thousands and is designed primarily when small 731 * HAMMER filesystems are created. 732 */ 733 hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100; 734 if (hammer_debug_general & 0x0001) 735 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit); 736 737 /* 738 * NOTE: Recover stage1 not only handles meta-data recovery, it 739 * also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems. 740 */ 741 error = hammer_recover_stage1(hmp, rootvol); 742 if (error) { 743 kprintf("Failed to recover HAMMER filesystem on mount\n"); 744 goto done; 745 } 746 747 /* 748 * Finish setup now that we have a good root volume. 749 * 750 * The top 16 bits of fsid.val[1] is a pfs id. 751 */ 752 ksnprintf(mp->mnt_stat.f_mntfromname, 753 sizeof(mp->mnt_stat.f_mntfromname), "%s", 754 rootvol->ondisk->vol_name); 755 mp->mnt_stat.f_fsid.val[0] = 756 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8); 757 mp->mnt_stat.f_fsid.val[1] = 758 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8); 759 mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF; 760 761 mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid; 762 mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid, 763 sizeof(mp->mnt_vstat.f_fsid_uuid)); 764 765 /* 766 * Certain often-modified fields in the root volume are cached in 767 * the hammer_mount structure so we do not have to generate lots 768 * of little UNDO structures for them. 769 * 770 * Recopy after recovery. This also has the side effect of 771 * setting our cached undo FIFO's first_offset, which serves to 772 * placemark the FIFO start for the NEXT flush cycle while the 773 * on-disk first_offset represents the LAST flush cycle. 774 */ 775 hmp->next_tid = rootvol->ondisk->vol0_next_tid; 776 hmp->flush_tid1 = hmp->next_tid; 777 hmp->flush_tid2 = hmp->next_tid; 778 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, 779 sizeof(hmp->blockmap)); 780 hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks; 781 782 hammer_flusher_create(hmp); 783 784 /* 785 * Locate the root directory using the root cluster's B-Tree as a 786 * starting point. The root directory uses an obj_id of 1. 787 * 788 * FUTURE: Leave the root directory cached referenced but unlocked 789 * in hmp->rootvp (need to flush it on unmount). 790 */ 791 error = hammer_vfs_vget(mp, NULL, 1, &rootvp); 792 if (error) 793 goto done; 794 vput(rootvp); 795 /*vn_unlock(hmp->rootvp);*/ 796 if (hmp->ronly == 0) 797 error = hammer_recover_stage2(hmp, rootvol); 798 799 /* 800 * If the stage2 recovery fails be sure to clean out all cached 801 * vnodes before throwing away the mount structure or bad things 802 * will happen. 803 */ 804 if (error) 805 vflush(mp, 0, 0); 806 807 done: 808 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 809 /* New mount */ 810 811 /* Populate info for mount point (NULL pad)*/ 812 bzero(mp->mnt_stat.f_mntonname, MNAMELEN); 813 size_t size; 814 if (mntpt) { 815 copyinstr(mntpt, mp->mnt_stat.f_mntonname, 816 MNAMELEN -1, &size); 817 } else { /* Root mount */ 818 mp->mnt_stat.f_mntonname[0] = '/'; 819 } 820 } 821 (void)VFS_STATFS(mp, &mp->mnt_stat, cred); 822 hammer_rel_volume(rootvol, 0); 823 failed: 824 /* 825 * Cleanup and return. 826 */ 827 if (error) { 828 /* called with fs_token held */ 829 hammer_free_hmp(mp); 830 } else { 831 lwkt_reltoken(&hmp->fs_token); 832 } 833 return (error); 834 } 835 836 static int 837 hammer_vfs_unmount(struct mount *mp, int mntflags) 838 { 839 hammer_mount_t hmp = (void *)mp->mnt_data; 840 int flags; 841 int error; 842 843 /* 844 * Clean out the vnodes 845 */ 846 lwkt_gettoken(&hmp->fs_token); 847 flags = 0; 848 if (mntflags & MNT_FORCE) 849 flags |= FORCECLOSE; 850 error = vflush(mp, 0, flags); 851 852 /* 853 * Clean up the internal mount structure and related entities. This 854 * may issue I/O. 855 */ 856 if (error == 0) { 857 /* called with fs_token held */ 858 hammer_free_hmp(mp); 859 } else { 860 lwkt_reltoken(&hmp->fs_token); 861 } 862 return(error); 863 } 864 865 /* 866 * Clean up the internal mount structure and disassociate it from the mount. 867 * This may issue I/O. 868 * 869 * Called with fs_token held. 870 */ 871 static void 872 hammer_free_hmp(struct mount *mp) 873 { 874 hammer_mount_t hmp = (void *)mp->mnt_data; 875 hammer_flush_group_t flg; 876 int count; 877 int dummy; 878 879 /* 880 * Flush anything dirty. This won't even run if the 881 * filesystem errored-out. 882 */ 883 count = 0; 884 while (hammer_flusher_haswork(hmp)) { 885 hammer_flusher_sync(hmp); 886 ++count; 887 if (count >= 5) { 888 if (count == 5) 889 kprintf("HAMMER: umount flushing."); 890 else 891 kprintf("."); 892 tsleep(&dummy, 0, "hmrufl", hz); 893 } 894 if (count == 30) { 895 kprintf("giving up\n"); 896 break; 897 } 898 } 899 if (count >= 5 && count < 30) 900 kprintf("\n"); 901 902 /* 903 * If the mount had a critical error we have to destroy any 904 * remaining inodes before we can finish cleaning up the flusher. 905 */ 906 if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) { 907 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, 908 hammer_destroy_inode_callback, NULL); 909 } 910 911 /* 912 * There shouldn't be any inodes left now and any left over 913 * flush groups should now be empty. 914 */ 915 KKASSERT(RB_EMPTY(&hmp->rb_inos_root)); 916 while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) { 917 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry); 918 KKASSERT(RB_EMPTY(&flg->flush_tree)); 919 if (flg->refs) { 920 kprintf("HAMMER: Warning, flush_group %p was " 921 "not empty on umount!\n", flg); 922 } 923 kfree(flg, hmp->m_misc); 924 } 925 926 /* 927 * We can finally destroy the flusher 928 */ 929 hammer_flusher_destroy(hmp); 930 931 /* 932 * We may have held recovered buffers due to a read-only mount. 933 * These must be discarded. 934 */ 935 if (hmp->ronly) 936 hammer_recover_flush_buffers(hmp, NULL, -1); 937 938 /* 939 * Unload buffers and then volumes 940 */ 941 RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL, 942 hammer_unload_buffer, NULL); 943 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 944 hammer_unload_volume, NULL); 945 946 mp->mnt_data = NULL; 947 mp->mnt_flag &= ~MNT_LOCAL; 948 hmp->mp = NULL; 949 hammer_destroy_objid_cache(hmp); 950 hammer_destroy_dedup_cache(hmp); 951 if (hmp->dedup_free_cache != NULL) { 952 kfree(hmp->dedup_free_cache, hmp->m_misc); 953 hmp->dedup_free_cache = NULL; 954 } 955 kmalloc_destroy(&hmp->m_misc); 956 kmalloc_destroy(&hmp->m_inodes); 957 lwkt_reltoken(&hmp->fs_token); 958 kfree(hmp, M_HAMMER); 959 } 960 961 /* 962 * Report critical errors. ip may be NULL. 963 */ 964 void 965 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip, 966 int error, const char *msg) 967 { 968 hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR; 969 970 krateprintf(&hmp->krate, 971 "HAMMER(%s): Critical error inode=%jd error=%d %s\n", 972 hmp->mp->mnt_stat.f_mntfromname, 973 (intmax_t)(ip ? ip->obj_id : -1), 974 error, msg); 975 976 if (hmp->ronly == 0) { 977 hmp->ronly = 2; /* special errored read-only mode */ 978 hmp->mp->mnt_flag |= MNT_RDONLY; 979 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, 980 hammer_adjust_volume_mode, NULL); 981 kprintf("HAMMER(%s): Forcing read-only mode\n", 982 hmp->mp->mnt_stat.f_mntfromname); 983 } 984 hmp->error = error; 985 if (hammer_debug_critical) 986 Debugger("Entering debugger"); 987 } 988 989 990 /* 991 * Obtain a vnode for the specified inode number. An exclusively locked 992 * vnode is returned. 993 */ 994 int 995 hammer_vfs_vget(struct mount *mp, struct vnode *dvp, 996 ino_t ino, struct vnode **vpp) 997 { 998 struct hammer_transaction trans; 999 struct hammer_mount *hmp = (void *)mp->mnt_data; 1000 struct hammer_inode *ip; 1001 int error; 1002 u_int32_t localization; 1003 1004 lwkt_gettoken(&hmp->fs_token); 1005 hammer_simple_transaction(&trans, hmp); 1006 1007 /* 1008 * If a directory vnode is supplied (mainly NFS) then we can acquire 1009 * the PFS domain from it. Otherwise we would only be able to vget 1010 * inodes in the root PFS. 1011 */ 1012 if (dvp) { 1013 localization = HAMMER_DEF_LOCALIZATION + 1014 VTOI(dvp)->obj_localization; 1015 } else { 1016 localization = HAMMER_DEF_LOCALIZATION; 1017 } 1018 1019 /* 1020 * Lookup the requested HAMMER inode. The structure must be 1021 * left unlocked while we manipulate the related vnode to avoid 1022 * a deadlock. 1023 */ 1024 ip = hammer_get_inode(&trans, NULL, ino, 1025 hmp->asof, localization, 1026 0, &error); 1027 if (ip == NULL) { 1028 *vpp = NULL; 1029 } else { 1030 error = hammer_get_vnode(ip, vpp); 1031 hammer_rel_inode(ip, 0); 1032 } 1033 hammer_done_transaction(&trans); 1034 lwkt_reltoken(&hmp->fs_token); 1035 return (error); 1036 } 1037 1038 /* 1039 * Return the root vnode for the filesystem. 1040 * 1041 * HAMMER stores the root vnode in the hammer_mount structure so 1042 * getting it is easy. 1043 */ 1044 static int 1045 hammer_vfs_root(struct mount *mp, struct vnode **vpp) 1046 { 1047 int error; 1048 1049 error = hammer_vfs_vget(mp, NULL, 1, vpp); 1050 return (error); 1051 } 1052 1053 static int 1054 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 1055 { 1056 struct hammer_mount *hmp = (void *)mp->mnt_data; 1057 hammer_volume_t volume; 1058 hammer_volume_ondisk_t ondisk; 1059 int error; 1060 int64_t bfree; 1061 int64_t breserved; 1062 1063 lwkt_gettoken(&hmp->fs_token); 1064 volume = hammer_get_root_volume(hmp, &error); 1065 if (error) { 1066 lwkt_reltoken(&hmp->fs_token); 1067 return(error); 1068 } 1069 ondisk = volume->ondisk; 1070 1071 /* 1072 * Basic stats 1073 */ 1074 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved); 1075 mp->mnt_stat.f_files = ondisk->vol0_stat_inodes; 1076 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE; 1077 hammer_rel_volume(volume, 0); 1078 1079 mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE; 1080 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree; 1081 if (mp->mnt_stat.f_files < 0) 1082 mp->mnt_stat.f_files = 0; 1083 1084 *sbp = mp->mnt_stat; 1085 lwkt_reltoken(&hmp->fs_token); 1086 return(0); 1087 } 1088 1089 static int 1090 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 1091 { 1092 struct hammer_mount *hmp = (void *)mp->mnt_data; 1093 hammer_volume_t volume; 1094 hammer_volume_ondisk_t ondisk; 1095 int error; 1096 int64_t bfree; 1097 int64_t breserved; 1098 1099 lwkt_gettoken(&hmp->fs_token); 1100 volume = hammer_get_root_volume(hmp, &error); 1101 if (error) { 1102 lwkt_reltoken(&hmp->fs_token); 1103 return(error); 1104 } 1105 ondisk = volume->ondisk; 1106 1107 /* 1108 * Basic stats 1109 */ 1110 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved); 1111 mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes; 1112 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE; 1113 hammer_rel_volume(volume, 0); 1114 1115 mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE; 1116 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree; 1117 if (mp->mnt_vstat.f_files < 0) 1118 mp->mnt_vstat.f_files = 0; 1119 *sbp = mp->mnt_vstat; 1120 lwkt_reltoken(&hmp->fs_token); 1121 return(0); 1122 } 1123 1124 /* 1125 * Sync the filesystem. Currently we have to run it twice, the second 1126 * one will advance the undo start index to the end index, so if a crash 1127 * occurs no undos will be run on mount. 1128 * 1129 * We do not sync the filesystem if we are called from a panic. If we did 1130 * we might end up blowing up a sync that was already in progress. 1131 */ 1132 static int 1133 hammer_vfs_sync(struct mount *mp, int waitfor) 1134 { 1135 struct hammer_mount *hmp = (void *)mp->mnt_data; 1136 int error; 1137 1138 lwkt_gettoken(&hmp->fs_token); 1139 if (panicstr == NULL) { 1140 error = hammer_sync_hmp(hmp, waitfor); 1141 } else { 1142 error = EIO; 1143 } 1144 lwkt_reltoken(&hmp->fs_token); 1145 return (error); 1146 } 1147 1148 /* 1149 * Convert a vnode to a file handle. 1150 * 1151 * Accesses read-only fields on already-referenced structures so 1152 * no token is needed. 1153 */ 1154 static int 1155 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp) 1156 { 1157 hammer_inode_t ip; 1158 1159 KKASSERT(MAXFIDSZ >= 16); 1160 ip = VTOI(vp); 1161 fhp->fid_len = offsetof(struct fid, fid_data[16]); 1162 fhp->fid_ext = ip->obj_localization >> 16; 1163 bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id)); 1164 bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof)); 1165 return(0); 1166 } 1167 1168 1169 /* 1170 * Convert a file handle back to a vnode. 1171 * 1172 * Use rootvp to enforce PFS isolation when a PFS is exported via a 1173 * null mount. 1174 */ 1175 static int 1176 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 1177 struct fid *fhp, struct vnode **vpp) 1178 { 1179 hammer_mount_t hmp = (void *)mp->mnt_data; 1180 struct hammer_transaction trans; 1181 struct hammer_inode *ip; 1182 struct hammer_inode_info info; 1183 int error; 1184 u_int32_t localization; 1185 1186 bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id)); 1187 bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof)); 1188 if (rootvp) 1189 localization = VTOI(rootvp)->obj_localization; 1190 else 1191 localization = (u_int32_t)fhp->fid_ext << 16; 1192 1193 lwkt_gettoken(&hmp->fs_token); 1194 hammer_simple_transaction(&trans, hmp); 1195 1196 /* 1197 * Get/allocate the hammer_inode structure. The structure must be 1198 * unlocked while we manipulate the related vnode to avoid a 1199 * deadlock. 1200 */ 1201 ip = hammer_get_inode(&trans, NULL, info.obj_id, 1202 info.obj_asof, localization, 0, &error); 1203 if (ip) { 1204 error = hammer_get_vnode(ip, vpp); 1205 hammer_rel_inode(ip, 0); 1206 } else { 1207 *vpp = NULL; 1208 } 1209 hammer_done_transaction(&trans); 1210 lwkt_reltoken(&hmp->fs_token); 1211 return (error); 1212 } 1213 1214 static int 1215 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 1216 int *exflagsp, struct ucred **credanonp) 1217 { 1218 hammer_mount_t hmp = (void *)mp->mnt_data; 1219 struct netcred *np; 1220 int error; 1221 1222 lwkt_gettoken(&hmp->fs_token); 1223 np = vfs_export_lookup(mp, &hmp->export, nam); 1224 if (np) { 1225 *exflagsp = np->netc_exflags; 1226 *credanonp = &np->netc_anon; 1227 error = 0; 1228 } else { 1229 error = EACCES; 1230 } 1231 lwkt_reltoken(&hmp->fs_token); 1232 return (error); 1233 1234 } 1235 1236 int 1237 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export) 1238 { 1239 hammer_mount_t hmp = (void *)mp->mnt_data; 1240 int error; 1241 1242 lwkt_gettoken(&hmp->fs_token); 1243 1244 switch(op) { 1245 case MOUNTCTL_SET_EXPORT: 1246 error = vfs_export(mp, &hmp->export, export); 1247 break; 1248 default: 1249 error = EOPNOTSUPP; 1250 break; 1251 } 1252 lwkt_reltoken(&hmp->fs_token); 1253 1254 return(error); 1255 } 1256 1257