sys/vfs/hammer/hammer_vfsops.c

   1 /*
   2  * Copyright (c) 2007-2008 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/vfs/hammer/hammer_vfsops.c,v 1.74 2008/11/13 02:18:43 dillon Exp $
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/kernel.h>
  40 #include <sys/vnode.h>
  41 #include <sys/mount.h>
  42 #include <sys/malloc.h>
  43 #include <sys/nlookup.h>
  44 #include <sys/fcntl.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/buf.h>
  47 #include <sys/buf2.h>
  48 #include "hammer.h"
  49
  50 int hammer_debug_io;
  51 int hammer_debug_general;
  52 int hammer_debug_debug = 1;             /* medium-error panics */
  53 int hammer_debug_inode;
  54 int hammer_debug_locks;
  55 int hammer_debug_btree;
  56 int hammer_debug_tid;
  57 int hammer_debug_recover;               /* -1 will disable, +1 will force */
  58 int hammer_debug_recover_faults;
  59 int hammer_cluster_enable = 1;          /* enable read clustering by default */
  60 int hammer_count_fsyncs;
  61 int hammer_count_inodes;
  62 int hammer_count_iqueued;
  63 int hammer_count_reclaiming;
  64 int hammer_count_records;
  65 int hammer_count_record_datas;
  66 int hammer_count_volumes;
  67 int hammer_count_buffers;
  68 int hammer_count_nodes;
  69 int64_t hammer_count_extra_space_used;
  70 int64_t hammer_stats_btree_lookups;
  71 int64_t hammer_stats_btree_searches;
  72 int64_t hammer_stats_btree_inserts;
  73 int64_t hammer_stats_btree_deletes;
  74 int64_t hammer_stats_btree_elements;
  75 int64_t hammer_stats_btree_splits;
  76 int64_t hammer_stats_btree_iterations;
  77 int64_t hammer_stats_btree_root_iterations;
  78 int64_t hammer_stats_record_iterations;
  79
  80 int64_t hammer_stats_file_read;
  81 int64_t hammer_stats_file_write;
  82 int64_t hammer_stats_file_iopsr;
  83 int64_t hammer_stats_file_iopsw;
  84 int64_t hammer_stats_disk_read;
  85 int64_t hammer_stats_disk_write;
  86 int64_t hammer_stats_inode_flushes;
  87 int64_t hammer_stats_commits;
  88
  89 int hammer_count_dirtybufspace;         /* global */
  90 int hammer_count_refedbufs;             /* global */
  91 int hammer_count_reservations;
  92 int hammer_count_io_running_read;
  93 int hammer_count_io_running_write;
  94 int hammer_count_io_locked;
  95 int hammer_limit_dirtybufspace;         /* per-mount */
  96 int hammer_limit_recs;                  /* as a whole XXX */
  97 int hammer_autoflush = 2000;            /* auto flush */
  98 int hammer_bio_count;
  99 int hammer_verify_zone;
 100 int hammer_verify_data = 1;
 101 int hammer_write_mode;
 102 int64_t hammer_contention_count;
 103 int64_t hammer_zone_limit;
 104
 105 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
 106 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
 107            &hammer_debug_general, 0, "");
 108 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
 109            &hammer_debug_io, 0, "");
 110 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
 111            &hammer_debug_debug, 0, "");
 112 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
 113            &hammer_debug_inode, 0, "");
 114 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
 115            &hammer_debug_locks, 0, "");
 116 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
 117            &hammer_debug_btree, 0, "");
 118 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
 119            &hammer_debug_tid, 0, "");
 120 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
 121            &hammer_debug_recover, 0, "");
 122 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
 123            &hammer_debug_recover_faults, 0, "");
 124 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
 125            &hammer_cluster_enable, 0, "");
 126
 127 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
 128            &hammer_limit_dirtybufspace, 0, "");
 129 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
 130            &hammer_limit_recs, 0, "");
 131
 132 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
 133            &hammer_count_fsyncs, 0, "");
 134 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
 135            &hammer_count_inodes, 0, "");
 136 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
 137            &hammer_count_iqueued, 0, "");
 138 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD,
 139            &hammer_count_reclaiming, 0, "");
 140 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
 141            &hammer_count_records, 0, "");
 142 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
 143            &hammer_count_record_datas, 0, "");
 144 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
 145            &hammer_count_volumes, 0, "");
 146 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
 147            &hammer_count_buffers, 0, "");
 148 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
 149            &hammer_count_nodes, 0, "");
 150 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
 151            &hammer_count_extra_space_used, 0, "");
 152
 153 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
 154            &hammer_stats_btree_searches, 0, "");
 155 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
 156            &hammer_stats_btree_lookups, 0, "");
 157 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
 158            &hammer_stats_btree_inserts, 0, "");
 159 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
 160            &hammer_stats_btree_deletes, 0, "");
 161 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
 162            &hammer_stats_btree_elements, 0, "");
 163 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
 164            &hammer_stats_btree_splits, 0, "");
 165 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
 166            &hammer_stats_btree_iterations, 0, "");
 167 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
 168            &hammer_stats_btree_root_iterations, 0, "");
 169 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
 170            &hammer_stats_record_iterations, 0, "");
 171
 172 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
 173            &hammer_stats_file_read, 0, "");
 174 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
 175            &hammer_stats_file_write, 0, "");
 176 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
 177            &hammer_stats_file_iopsr, 0, "");
 178 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
 179            &hammer_stats_file_iopsw, 0, "");
 180 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
 181            &hammer_stats_disk_read, 0, "");
 182 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
 183            &hammer_stats_disk_write, 0, "");
 184 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
 185            &hammer_stats_inode_flushes, 0, "");
 186 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
 187            &hammer_stats_commits, 0, "");
 188
 189 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
 190            &hammer_count_dirtybufspace, 0, "");
 191 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
 192            &hammer_count_refedbufs, 0, "");
 193 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
 194            &hammer_count_reservations, 0, "");
 195 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
 196            &hammer_count_io_running_read, 0, "");
 197 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
 198            &hammer_count_io_locked, 0, "");
 199 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
 200            &hammer_count_io_running_write, 0, "");
 201 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
 202            &hammer_zone_limit, 0, "");
 203 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
 204            &hammer_contention_count, 0, "");
 205 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
 206            &hammer_autoflush, 0, "");
 207 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
 208            &hammer_verify_zone, 0, "");
 209 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
 210            &hammer_verify_data, 0, "");
 211 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
 212            &hammer_write_mode, 0, "");
 213
 214 KTR_INFO_MASTER(hammer);
 215
 216 /*
 217  * VFS ABI
 218  */
 219 static void     hammer_free_hmp(struct mount *mp);
 220
 221 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
 222                                 struct ucred *cred);
 223 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
 224 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
 225 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
 226                                 struct ucred *cred);
 227 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 228                                 struct ucred *cred);
 229 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
 230 static int      hammer_vfs_vget(struct mount *mp, ino_t ino,
 231                                 struct vnode **vpp);
 232 static int      hammer_vfs_init(struct vfsconf *conf);
 233 static int      hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 234                                 struct fid *fhp, struct vnode **vpp);
 235 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 236 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 237                                 int *exflagsp, struct ucred **credanonp);
 238
 239
 240 static struct vfsops hammer_vfsops = {
 241         .vfs_mount      = hammer_vfs_mount,
 242         .vfs_unmount    = hammer_vfs_unmount,
 243         .vfs_root       = hammer_vfs_root,
 244         .vfs_statfs     = hammer_vfs_statfs,
 245         .vfs_statvfs    = hammer_vfs_statvfs,
 246         .vfs_sync       = hammer_vfs_sync,
 247         .vfs_vget       = hammer_vfs_vget,
 248         .vfs_init       = hammer_vfs_init,
 249         .vfs_vptofh     = hammer_vfs_vptofh,
 250         .vfs_fhtovp     = hammer_vfs_fhtovp,
 251         .vfs_checkexp   = hammer_vfs_checkexp
 252 };
 253
 254 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
 255
 256 VFS_SET(hammer_vfsops, hammer, 0);
 257 MODULE_VERSION(hammer, 1);
 258
 259 static int
 260 hammer_vfs_init(struct vfsconf *conf)
 261 {
 262         int n;
 263
 264         if (hammer_limit_recs == 0) {
 265                 hammer_limit_recs = nbuf * 25;
 266                 n = kmalloc_limit(M_HAMMER) / 512;
 267                 if (hammer_limit_recs > n)
 268                         hammer_limit_recs = n;
 269         }
 270         if (hammer_limit_dirtybufspace == 0) {
 271                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
 272                 if (hammer_limit_dirtybufspace < 100)
 273                         hammer_limit_dirtybufspace = 100;
 274         }
 275         return(0);
 276 }
 277
 278 static int
 279 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
 280                  struct ucred *cred)
 281 {
 282         struct hammer_mount_info info;
 283         hammer_mount_t hmp;
 284         hammer_volume_t rootvol;
 285         struct vnode *rootvp;
 286         struct vnode *devvp = NULL;
 287         const char *upath;      /* volume name in userspace */
 288         char *path;             /* volume name in system space */
 289         int error;
 290         int i;
 291         int master_id;
 292         int maxinodes;
 293
 294         /*
 295          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
 296          */
 297         if (mntpt == NULL) {
 298                 if ((error = bdevvp(rootdev, &devvp))) {
 299                         kprintf("hammer_mountroot: can't find devvp\n");
 300                         return (error);
 301                 }
 302                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
 303                 bzero(&info, sizeof(info));
 304                 info.asof = 0;
 305                 info.hflags = 0;
 306                 info.nvolumes = 1;
 307         } else {
 308                 if ((error = copyin(data, &info, sizeof(info))) != 0)
 309                         return (error);
 310         }
 311
 312         /*
 313          * updating or new mount
 314          */
 315         if (mp->mnt_flag & MNT_UPDATE) {
 316                 hmp = (void *)mp->mnt_data;
 317                 KKASSERT(hmp != NULL);
 318         } else {
 319                 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
 320                         return (EINVAL);
 321                 hmp = NULL;
 322         }
 323
 324         /*
 325          * master-id validation.  The master id may not be changed by a
 326          * mount update.
 327          */
 328         if (info.hflags & HMNT_MASTERID) {
 329                 if (hmp && hmp->master_id != info.master_id) {
 330                         kprintf("hammer: cannot change master id "
 331                                 "with mount update\n");
 332                         return(EINVAL);
 333                 }
 334                 master_id = info.master_id;
 335                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
 336                         return (EINVAL);
 337         } else {
 338                 if (hmp)
 339                         master_id = hmp->master_id;
 340                 else
 341                         master_id = 0;
 342         }
 343
 344         /*
 345          * Interal mount data structure
 346          */
 347         if (hmp == NULL) {
 348                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
 349                 mp->mnt_data = (qaddr_t)hmp;
 350                 hmp->mp = mp;
 351                 /*TAILQ_INIT(&hmp->recycle_list);*/
 352
 353                 /*
 354                  * Make sure kmalloc type limits are set appropriately.  If root
 355                  * increases the vnode limit you may have to do a dummy remount
 356                  * to adjust the HAMMER inode limit.
 357                  */
 358                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
 359                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
 360
 361                 maxinodes = desiredvnodes + desiredvnodes / 5 +
 362                             HAMMER_RECLAIM_WAIT;
 363                 kmalloc_raise_limit(hmp->m_inodes,
 364                                     maxinodes * sizeof(struct hammer_inode));
 365
 366                 hmp->root_btree_beg.localization = 0x00000000U;
 367                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
 368                 hmp->root_btree_beg.key = -0x8000000000000000LL;
 369                 hmp->root_btree_beg.create_tid = 1;
 370                 hmp->root_btree_beg.delete_tid = 1;
 371                 hmp->root_btree_beg.rec_type = 0;
 372                 hmp->root_btree_beg.obj_type = 0;
 373
 374                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
 375                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
 376                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
 377                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
 378                 hmp->root_btree_end.delete_tid = 0;   /* special case */
 379                 hmp->root_btree_end.rec_type = 0xFFFFU;
 380                 hmp->root_btree_end.obj_type = 0;
 381
 382                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
 383                 hmp->krate.count = -16; /* initial burst */
 384
 385                 hmp->sync_lock.refs = 1;
 386                 hmp->free_lock.refs = 1;
 387                 hmp->undo_lock.refs = 1;
 388                 hmp->blkmap_lock.refs = 1;
 389
 390                 TAILQ_INIT(&hmp->delay_list);
 391                 TAILQ_INIT(&hmp->flush_group_list);
 392                 TAILQ_INIT(&hmp->objid_cache_list);
 393                 TAILQ_INIT(&hmp->undo_lru_list);
 394                 TAILQ_INIT(&hmp->reclaim_list);
 395         }
 396         hmp->hflags &= ~HMNT_USERFLAGS;
 397         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
 398
 399         hmp->master_id = master_id;
 400
 401         if (info.asof) {
 402                 mp->mnt_flag |= MNT_RDONLY;
 403                 hmp->asof = info.asof;
 404         } else {
 405                 hmp->asof = HAMMER_MAX_TID;
 406         }
 407
 408         /*
 409          * Re-open read-write if originally read-only, or vise-versa.
 410          */
 411         if (mp->mnt_flag & MNT_UPDATE) {
 412                 error = 0;
 413                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 414                         kprintf("HAMMER read-only -> read-write\n");
 415                         hmp->ronly = 0;
 416                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 417                                 hammer_adjust_volume_mode, NULL);
 418                         rootvol = hammer_get_root_volume(hmp, &error);
 419                         if (rootvol) {
 420                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
 421                                 bcopy(rootvol->ondisk->vol0_blockmap,
 422                                       hmp->blockmap,
 423                                       sizeof(hmp->blockmap));
 424                                 hammer_rel_volume(rootvol, 0);
 425                         }
 426                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 427                                 hammer_reload_inode, NULL);
 428                         /* kernel clears MNT_RDONLY */
 429                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 430                         kprintf("HAMMER read-write -> read-only\n");
 431                         hmp->ronly = 1; /* messy */
 432                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 433                                 hammer_reload_inode, NULL);
 434                         hmp->ronly = 0;
 435                         hammer_flusher_sync(hmp);
 436                         hammer_flusher_sync(hmp);
 437                         hammer_flusher_sync(hmp);
 438                         hmp->ronly = 1;
 439                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 440                                 hammer_adjust_volume_mode, NULL);
 441                 }
 442                 return(error);
 443         }
 444
 445         RB_INIT(&hmp->rb_vols_root);
 446         RB_INIT(&hmp->rb_inos_root);
 447         RB_INIT(&hmp->rb_nods_root);
 448         RB_INIT(&hmp->rb_undo_root);
 449         RB_INIT(&hmp->rb_resv_root);
 450         RB_INIT(&hmp->rb_bufs_root);
 451         RB_INIT(&hmp->rb_pfsm_root);
 452
 453         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 454
 455         TAILQ_INIT(&hmp->volu_list);
 456         TAILQ_INIT(&hmp->undo_list);
 457         TAILQ_INIT(&hmp->data_list);
 458         TAILQ_INIT(&hmp->meta_list);
 459         TAILQ_INIT(&hmp->lose_list);
 460
 461         /*
 462          * Load volumes
 463          */
 464         path = objcache_get(namei_oc, M_WAITOK);
 465         hmp->nvolumes = -1;
 466         for (i = 0; i < info.nvolumes; ++i) {
 467                 if (mntpt == NULL) {
 468                         /*
 469                          * Root mount.
 470                          * Only one volume; and no need for copyin.
 471                          */
 472                         KKASSERT(info.nvolumes == 1);
 473                         ksnprintf(path, MAXPATHLEN, "/dev/%s",
 474                                   mp->mnt_stat.f_mntfromname);
 475                         error = 0;
 476                 } else {
 477                         error = copyin(&info.volumes[i], &upath,
 478                                        sizeof(char *));
 479                         if (error == 0)
 480                                 error = copyinstr(upath, path,
 481                                                   MAXPATHLEN, NULL);
 482                 }
 483                 if (error == 0)
 484                         error = hammer_install_volume(hmp, path, devvp);
 485                 if (error)
 486                         break;
 487         }
 488         objcache_put(namei_oc, path);
 489
 490         /*
 491          * Make sure we found a root volume
 492          */
 493         if (error == 0 && hmp->rootvol == NULL) {
 494                 kprintf("hammer_mount: No root volume found!\n");
 495                 error = EINVAL;
 496         }
 497
 498         /*
 499          * Check that all required volumes are available
 500          */
 501         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
 502                 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
 503                 error = EINVAL;
 504         }
 505
 506         if (error) {
 507                 hammer_free_hmp(mp);
 508                 return (error);
 509         }
 510
 511         /*
 512          * No errors, setup enough of the mount point so we can lookup the
 513          * root vnode.
 514          */
 515         mp->mnt_iosize_max = MAXPHYS;
 516         mp->mnt_kern_flag |= MNTK_FSMID;
 517
 518         /*
 519          * note: f_iosize is used by vnode_pager_haspage() when constructing
 520          * its VOP_BMAP call.
 521          */
 522         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 523         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 524
 525         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
 526         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
 527
 528         mp->mnt_maxsymlinklen = 255;
 529         mp->mnt_flag |= MNT_LOCAL;
 530
 531         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 532         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 533         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 534
 535         /*
 536          * The root volume's ondisk pointer is only valid if we hold a
 537          * reference to it.
 538          */
 539         rootvol = hammer_get_root_volume(hmp, &error);
 540         if (error)
 541                 goto failed;
 542
 543         /*
 544          * Perform any necessary UNDO operations.  The recovery code does
 545          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
 546          * and then re-copy it again after recovery is complete.
 547          *
 548          * If this is a read-only mount the UNDO information is retained
 549          * in memory in the form of dirty buffer cache buffers, and not
 550          * written back to the media.
 551          */
 552         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 553               sizeof(hmp->blockmap));
 554
 555         /*
 556          * Check filesystem version
 557          */
 558         hmp->version = rootvol->ondisk->vol_version;
 559         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
 560             hmp->version > HAMMER_VOL_VERSION_MAX) {
 561                 kprintf("HAMMER: mount unsupported fs version %d\n",
 562                         hmp->version);
 563                 error = ERANGE;
 564                 goto done;
 565         }
 566
 567         /*
 568          * The undo_rec_limit limits the size of flush groups to avoid
 569          * blowing out the UNDO FIFO.  This calculation is typically in
 570          * the tens of thousands and is designed primarily when small
 571          * HAMMER filesystems are created.
 572          */
 573         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
 574         if (hammer_debug_general & 0x0001)
 575                 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
 576
 577         error = hammer_recover(hmp, rootvol);
 578         if (error) {
 579                 kprintf("Failed to recover HAMMER filesystem on mount\n");
 580                 goto done;
 581         }
 582
 583         /*
 584          * Finish setup now that we have a good root volume.
 585          *
 586          * The top 16 bits of fsid.val[1] is a pfs id.
 587          */
 588         ksnprintf(mp->mnt_stat.f_mntfromname,
 589                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 590                   rootvol->ondisk->vol_name);
 591         mp->mnt_stat.f_fsid.val[0] =
 592                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
 593         mp->mnt_stat.f_fsid.val[1] =
 594                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
 595         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
 596
 597         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
 598         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
 599                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
 600
 601         /*
 602          * Certain often-modified fields in the root volume are cached in
 603          * the hammer_mount structure so we do not have to generate lots
 604          * of little UNDO structures for them.
 605          *
 606          * Recopy after recovery.  This also has the side effect of
 607          * setting our cached undo FIFO's first_offset, which serves to
 608          * placemark the FIFO start for the NEXT flush cycle while the
 609          * on-disk first_offset represents the LAST flush cycle.
 610          */
 611         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
 612         hmp->flush_tid1 = hmp->next_tid;
 613         hmp->flush_tid2 = hmp->next_tid;
 614         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 615               sizeof(hmp->blockmap));
 616         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
 617
 618         hammer_flusher_create(hmp);
 619
 620         /*
 621          * Locate the root directory using the root cluster's B-Tree as a
 622          * starting point.  The root directory uses an obj_id of 1.
 623          *
 624          * FUTURE: Leave the root directory cached referenced but unlocked
 625          * in hmp->rootvp (need to flush it on unmount).
 626          */
 627         error = hammer_vfs_vget(mp, 1, &rootvp);
 628         if (error)
 629                 goto done;
 630         vput(rootvp);
 631         /*vn_unlock(hmp->rootvp);*/
 632
 633 done:
 634         hammer_rel_volume(rootvol, 0);
 635 failed:
 636         /*
 637          * Cleanup and return.
 638          */
 639         if (error)
 640                 hammer_free_hmp(mp);
 641         return (error);
 642 }
 643
 644 static int
 645 hammer_vfs_unmount(struct mount *mp, int mntflags)
 646 {
 647 #if 0
 648         struct hammer_mount *hmp = (void *)mp->mnt_data;
 649 #endif
 650         int flags;
 651         int error;
 652
 653         /*
 654          * Clean out the vnodes
 655          */
 656         flags = 0;
 657         if (mntflags & MNT_FORCE)
 658                 flags |= FORCECLOSE;
 659         if ((error = vflush(mp, 0, flags)) != 0)
 660                 return (error);
 661
 662         /*
 663          * Clean up the internal mount structure and related entities.  This
 664          * may issue I/O.
 665          */
 666         hammer_free_hmp(mp);
 667         return(0);
 668 }
 669
 670 /*
 671  * Clean up the internal mount structure and disassociate it from the mount.
 672  * This may issue I/O.
 673  */
 674 static void
 675 hammer_free_hmp(struct mount *mp)
 676 {
 677         struct hammer_mount *hmp = (void *)mp->mnt_data;
 678         hammer_flush_group_t flg;
 679         int count;
 680         int dummy;
 681
 682         /*
 683          * Flush anything dirty.  This won't even run if the
 684          * filesystem errored-out.
 685          */
 686         count = 0;
 687         while (hammer_flusher_haswork(hmp)) {
 688                 hammer_flusher_sync(hmp);
 689                 ++count;
 690                 if (count >= 5) {
 691                         if (count == 5)
 692                                 kprintf("HAMMER: umount flushing.");
 693                         else
 694                                 kprintf(".");
 695                         tsleep(&dummy, 0, "hmrufl", hz);
 696                 }
 697                 if (count == 30) {
 698                         kprintf("giving up\n");
 699                         break;
 700                 }
 701         }
 702         if (count >= 5 && count < 30)
 703                 kprintf("\n");
 704
 705         /*
 706          * If the mount had a critical error we have to destroy any
 707          * remaining inodes before we can finish cleaning up the flusher.
 708          */
 709         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
 710                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 711                         hammer_destroy_inode_callback, NULL);
 712         }
 713
 714         /*
 715          * There shouldn't be any inodes left now and any left over
 716          * flush groups should now be empty.
 717          */
 718         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
 719         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
 720                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
 721                 KKASSERT(TAILQ_EMPTY(&flg->flush_list));
 722                 if (flg->refs) {
 723                         kprintf("HAMMER: Warning, flush_group %p was "
 724                                 "not empty on umount!\n", flg);
 725                 }
 726                 kfree(flg, hmp->m_misc);
 727         }
 728
 729         /*
 730          * We can finally destroy the flusher
 731          */
 732         hammer_flusher_destroy(hmp);
 733
 734         /*
 735          * We may have held recovered buffers due to a read-only mount.
 736          * These must be discarded.
 737          */
 738         if (hmp->ronly)
 739                 hammer_recover_flush_buffers(hmp, NULL, -1);
 740
 741         /*
 742          * Unload buffers and then volumes
 743          */
 744         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 745                 hammer_unload_buffer, NULL);
 746         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 747                 hammer_unload_volume, NULL);
 748
 749         mp->mnt_data = NULL;
 750         mp->mnt_flag &= ~MNT_LOCAL;
 751         hmp->mp = NULL;
 752         hammer_destroy_objid_cache(hmp);
 753         kmalloc_destroy(&hmp->m_misc);
 754         kmalloc_destroy(&hmp->m_inodes);
 755         kfree(hmp, M_HAMMER);
 756 }
 757
 758 /*
 759  * Report critical errors.  ip may be NULL.
 760  */
 761 void
 762 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
 763                       int error, const char *msg)
 764 {
 765         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
 766         krateprintf(&hmp->krate,
 767                 "HAMMER(%s): Critical error inode=%lld %s\n",
 768                 hmp->mp->mnt_stat.f_mntfromname,
 769                 (long long)(ip ? ip->obj_id : -1), msg);
 770         if (hmp->ronly == 0) {
 771                 hmp->ronly = 2;         /* special errored read-only mode */
 772                 hmp->mp->mnt_flag |= MNT_RDONLY;
 773                 kprintf("HAMMER(%s): Forcing read-only mode\n",
 774                         hmp->mp->mnt_stat.f_mntfromname);
 775         }
 776         hmp->error = error;
 777 }
 778
 779
 780 /*
 781  * Obtain a vnode for the specified inode number.  An exclusively locked
 782  * vnode is returned.
 783  */
 784 int
 785 hammer_vfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
 786 {
 787         struct hammer_transaction trans;
 788         struct hammer_mount *hmp = (void *)mp->mnt_data;
 789         struct hammer_inode *ip;
 790         int error;
 791
 792         hammer_simple_transaction(&trans, hmp);
 793
 794         /*
 795          * Lookup the requested HAMMER inode.  The structure must be
 796          * left unlocked while we manipulate the related vnode to avoid
 797          * a deadlock.
 798          */
 799         ip = hammer_get_inode(&trans, NULL, ino,
 800                               hmp->asof, HAMMER_DEF_LOCALIZATION,
 801                               0, &error);
 802         if (ip == NULL) {
 803                 *vpp = NULL;
 804                 hammer_done_transaction(&trans);
 805                 return(error);
 806         }
 807         error = hammer_get_vnode(ip, vpp);
 808         hammer_rel_inode(ip, 0);
 809         hammer_done_transaction(&trans);
 810         return (error);
 811 }
 812
 813 /*
 814  * Return the root vnode for the filesystem.
 815  *
 816  * HAMMER stores the root vnode in the hammer_mount structure so
 817  * getting it is easy.
 818  */
 819 static int
 820 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
 821 {
 822 #if 0
 823         struct hammer_mount *hmp = (void *)mp->mnt_data;
 824 #endif
 825         int error;
 826
 827         error = hammer_vfs_vget(mp, 1, vpp);
 828         return (error);
 829 }
 830
 831 static int
 832 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 833 {
 834         struct hammer_mount *hmp = (void *)mp->mnt_data;
 835         hammer_volume_t volume;
 836         hammer_volume_ondisk_t ondisk;
 837         int error;
 838         int64_t bfree;
 839
 840         volume = hammer_get_root_volume(hmp, &error);
 841         if (error)
 842                 return(error);
 843         ondisk = volume->ondisk;
 844
 845         /*
 846          * Basic stats
 847          */
 848         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
 849         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 850         hammer_rel_volume(volume, 0);
 851
 852         mp->mnt_stat.f_bfree = bfree / HAMMER_BUFSIZE;
 853         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 854         if (mp->mnt_stat.f_files < 0)
 855                 mp->mnt_stat.f_files = 0;
 856
 857         *sbp = mp->mnt_stat;
 858         return(0);
 859 }
 860
 861 static int
 862 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 863 {
 864         struct hammer_mount *hmp = (void *)mp->mnt_data;
 865         hammer_volume_t volume;
 866         hammer_volume_ondisk_t ondisk;
 867         int error;
 868         int64_t bfree;
 869         int64_t breserved;
 870
 871         volume = hammer_get_root_volume(hmp, &error);
 872         if (error)
 873                 return(error);
 874         ondisk = volume->ondisk;
 875
 876         /*
 877          * Basic stats
 878          */
 879         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
 880         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
 881         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 882         hammer_rel_volume(volume, 0);
 883
 884         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
 885         mp->mnt_vstat.f_bavail = mp->mnt_stat.f_bfree;
 886         if (mp->mnt_vstat.f_files < 0)
 887                 mp->mnt_vstat.f_files = 0;
 888         *sbp = mp->mnt_vstat;
 889         return(0);
 890 }
 891
 892 /*
 893  * Sync the filesystem.  Currently we have to run it twice, the second
 894  * one will advance the undo start index to the end index, so if a crash
 895  * occurs no undos will be run on mount.
 896  *
 897  * We do not sync the filesystem if we are called from a panic.  If we did
 898  * we might end up blowing up a sync that was already in progress.
 899  */
 900 static int
 901 hammer_vfs_sync(struct mount *mp, int waitfor)
 902 {
 903         struct hammer_mount *hmp = (void *)mp->mnt_data;
 904         int error;
 905
 906         if (panicstr == NULL) {
 907                 error = hammer_sync_hmp(hmp, waitfor);
 908         } else {
 909                 error = EIO;
 910         }
 911         return (error);
 912 }
 913
 914 /*
 915  * Convert a vnode to a file handle.
 916  */
 917 static int
 918 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
 919 {
 920         hammer_inode_t ip;
 921
 922         KKASSERT(MAXFIDSZ >= 16);
 923         ip = VTOI(vp);
 924         fhp->fid_len = offsetof(struct fid, fid_data[16]);
 925         fhp->fid_ext = ip->obj_localization >> 16;
 926         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
 927         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
 928         return(0);
 929 }
 930
 931
 932 /*
 933  * Convert a file handle back to a vnode.
 934  *
 935  * Use rootvp to enforce PFS isolation when a PFS is exported via a
 936  * null mount.
 937  */
 938 static int
 939 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 940                   struct fid *fhp, struct vnode **vpp)
 941 {
 942         struct hammer_transaction trans;
 943         struct hammer_inode *ip;
 944         struct hammer_inode_info info;
 945         int error;
 946         u_int32_t localization;
 947
 948         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
 949         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
 950         if (rootvp)
 951                 localization = VTOI(rootvp)->obj_localization;
 952         else
 953                 localization = (u_int32_t)fhp->fid_ext << 16;
 954
 955         hammer_simple_transaction(&trans, (void *)mp->mnt_data);
 956
 957         /*
 958          * Get/allocate the hammer_inode structure.  The structure must be
 959          * unlocked while we manipulate the related vnode to avoid a
 960          * deadlock.
 961          */
 962         ip = hammer_get_inode(&trans, NULL, info.obj_id,
 963                               info.obj_asof, localization, 0, &error);
 964         if (ip == NULL) {
 965                 *vpp = NULL;
 966                 return(error);
 967         }
 968         error = hammer_get_vnode(ip, vpp);
 969         hammer_rel_inode(ip, 0);
 970         hammer_done_transaction(&trans);
 971         return (error);
 972 }
 973
 974 static int
 975 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 976                     int *exflagsp, struct ucred **credanonp)
 977 {
 978         hammer_mount_t hmp = (void *)mp->mnt_data;
 979         struct netcred *np;
 980         int error;
 981
 982         np = vfs_export_lookup(mp, &hmp->export, nam);
 983         if (np) {
 984                 *exflagsp = np->netc_exflags;
 985                 *credanonp = &np->netc_anon;
 986                 error = 0;
 987         } else {
 988                 error = EACCES;
 989         }
 990         return (error);
 991
 992 }
 993
 994 int
 995 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
 996 {
 997         hammer_mount_t hmp = (void *)mp->mnt_data;
 998         int error;
 999
1000         switch(op) {
1001         case MOUNTCTL_SET_EXPORT:
1002                 error = vfs_export(mp, &hmp->export, export);
1003                 break;
1004         default:
1005                 error = EOPNOTSUPP;
1006                 break;
1007         }
1008         return(error);
1009 }
1010