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_supported_version = HAMMER_VOL_VERSION_DEFAULT;
  51 int hammer_debug_io;
  52 int hammer_debug_general;
  53 int hammer_debug_debug = 1;             /* medium-error panics */
  54 int hammer_debug_inode;
  55 int hammer_debug_locks;
  56 int hammer_debug_btree;
  57 int hammer_debug_tid;
  58 int hammer_debug_recover;               /* -1 will disable, +1 will force */
  59 int hammer_debug_recover_faults;
  60 int hammer_debug_critical;              /* non-zero enter debugger on error */
  61 int hammer_cluster_enable = 1;          /* enable read clustering by default */
  62 int hammer_count_fsyncs;
  63 int hammer_count_inodes;
  64 int hammer_count_iqueued;
  65 int hammer_count_reclaiming;
  66 int hammer_count_records;
  67 int hammer_count_record_datas;
  68 int hammer_count_volumes;
  69 int hammer_count_buffers;
  70 int hammer_count_nodes;
  71 int64_t hammer_count_extra_space_used;
  72 int64_t hammer_stats_btree_lookups;
  73 int64_t hammer_stats_btree_searches;
  74 int64_t hammer_stats_btree_inserts;
  75 int64_t hammer_stats_btree_deletes;
  76 int64_t hammer_stats_btree_elements;
  77 int64_t hammer_stats_btree_splits;
  78 int64_t hammer_stats_btree_iterations;
  79 int64_t hammer_stats_btree_root_iterations;
  80 int64_t hammer_stats_record_iterations;
  81
  82 int64_t hammer_stats_file_read;
  83 int64_t hammer_stats_file_write;
  84 int64_t hammer_stats_file_iopsr;
  85 int64_t hammer_stats_file_iopsw;
  86 int64_t hammer_stats_disk_read;
  87 int64_t hammer_stats_disk_write;
  88 int64_t hammer_stats_inode_flushes;
  89 int64_t hammer_stats_commits;
  90 int64_t hammer_stats_undo;
  91
  92 int hammer_count_dirtybufspace;         /* global */
  93 int hammer_count_refedbufs;             /* global */
  94 int hammer_count_reservations;
  95 int hammer_count_io_running_read;
  96 int hammer_count_io_running_write;
  97 int hammer_count_io_locked;
  98 int hammer_limit_dirtybufspace;         /* per-mount */
  99 int hammer_limit_recs;                  /* as a whole XXX */
 100 int hammer_limit_inode_recs = 1024;     /* per inode */
 101 int hammer_limit_reclaim = HAMMER_RECLAIM_WAIT;
 102 int hammer_autoflush = 2000;            /* auto flush */
 103 int hammer_bio_count;
 104 int hammer_verify_zone;
 105 int hammer_verify_data = 1;
 106 int hammer_write_mode;
 107 int hammer_yield_check = 16;
 108 int hammer_fsync_mode;
 109 int64_t hammer_contention_count;
 110 int64_t hammer_zone_limit;
 111
 112 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
 113 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD,
 114            &hammer_supported_version, 0, "");
 115 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
 116            &hammer_debug_general, 0, "");
 117 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
 118            &hammer_debug_io, 0, "");
 119 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
 120            &hammer_debug_debug, 0, "");
 121 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
 122            &hammer_debug_inode, 0, "");
 123 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
 124            &hammer_debug_locks, 0, "");
 125 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
 126            &hammer_debug_btree, 0, "");
 127 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
 128            &hammer_debug_tid, 0, "");
 129 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
 130            &hammer_debug_recover, 0, "");
 131 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
 132            &hammer_debug_recover_faults, 0, "");
 133 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW,
 134            &hammer_debug_critical, 0, "");
 135 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
 136            &hammer_cluster_enable, 0, "");
 137
 138 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
 139            &hammer_limit_dirtybufspace, 0, "");
 140 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
 141            &hammer_limit_recs, 0, "");
 142 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
 143            &hammer_limit_inode_recs, 0, "");
 144 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaim, CTLFLAG_RW,
 145            &hammer_limit_reclaim, 0, "");
 146
 147 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
 148            &hammer_count_fsyncs, 0, "");
 149 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
 150            &hammer_count_inodes, 0, "");
 151 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
 152            &hammer_count_iqueued, 0, "");
 153 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD,
 154            &hammer_count_reclaiming, 0, "");
 155 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
 156            &hammer_count_records, 0, "");
 157 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
 158            &hammer_count_record_datas, 0, "");
 159 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
 160            &hammer_count_volumes, 0, "");
 161 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
 162            &hammer_count_buffers, 0, "");
 163 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
 164            &hammer_count_nodes, 0, "");
 165 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
 166            &hammer_count_extra_space_used, 0, "");
 167
 168 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
 169            &hammer_stats_btree_searches, 0, "");
 170 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
 171            &hammer_stats_btree_lookups, 0, "");
 172 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
 173            &hammer_stats_btree_inserts, 0, "");
 174 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
 175            &hammer_stats_btree_deletes, 0, "");
 176 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
 177            &hammer_stats_btree_elements, 0, "");
 178 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
 179            &hammer_stats_btree_splits, 0, "");
 180 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
 181            &hammer_stats_btree_iterations, 0, "");
 182 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
 183            &hammer_stats_btree_root_iterations, 0, "");
 184 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
 185            &hammer_stats_record_iterations, 0, "");
 186
 187 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
 188            &hammer_stats_file_read, 0, "");
 189 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
 190            &hammer_stats_file_write, 0, "");
 191 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
 192            &hammer_stats_file_iopsr, 0, "");
 193 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
 194            &hammer_stats_file_iopsw, 0, "");
 195 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
 196            &hammer_stats_disk_read, 0, "");
 197 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
 198            &hammer_stats_disk_write, 0, "");
 199 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
 200            &hammer_stats_inode_flushes, 0, "");
 201 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
 202            &hammer_stats_commits, 0, "");
 203 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
 204            &hammer_stats_undo, 0, "");
 205
 206 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
 207            &hammer_count_dirtybufspace, 0, "");
 208 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
 209            &hammer_count_refedbufs, 0, "");
 210 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
 211            &hammer_count_reservations, 0, "");
 212 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
 213            &hammer_count_io_running_read, 0, "");
 214 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
 215            &hammer_count_io_locked, 0, "");
 216 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
 217            &hammer_count_io_running_write, 0, "");
 218 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
 219            &hammer_zone_limit, 0, "");
 220 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
 221            &hammer_contention_count, 0, "");
 222 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
 223            &hammer_autoflush, 0, "");
 224 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
 225            &hammer_verify_zone, 0, "");
 226 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
 227            &hammer_verify_data, 0, "");
 228 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
 229            &hammer_write_mode, 0, "");
 230 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW,
 231            &hammer_yield_check, 0, "");
 232 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
 233            &hammer_fsync_mode, 0, "");
 234
 235 KTR_INFO_MASTER(hammer);
 236
 237 /*
 238  * VFS ABI
 239  */
 240 static void     hammer_free_hmp(struct mount *mp);
 241
 242 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
 243                                 struct ucred *cred);
 244 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
 245 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
 246 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
 247                                 struct ucred *cred);
 248 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 249                                 struct ucred *cred);
 250 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
 251 static int      hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 252                                 ino_t ino, struct vnode **vpp);
 253 static int      hammer_vfs_init(struct vfsconf *conf);
 254 static int      hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 255                                 struct fid *fhp, struct vnode **vpp);
 256 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 257 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 258                                 int *exflagsp, struct ucred **credanonp);
 259
 260
 261 static struct vfsops hammer_vfsops = {
 262         .vfs_mount      = hammer_vfs_mount,
 263         .vfs_unmount    = hammer_vfs_unmount,
 264         .vfs_root       = hammer_vfs_root,
 265         .vfs_statfs     = hammer_vfs_statfs,
 266         .vfs_statvfs    = hammer_vfs_statvfs,
 267         .vfs_sync       = hammer_vfs_sync,
 268         .vfs_vget       = hammer_vfs_vget,
 269         .vfs_init       = hammer_vfs_init,
 270         .vfs_vptofh     = hammer_vfs_vptofh,
 271         .vfs_fhtovp     = hammer_vfs_fhtovp,
 272         .vfs_checkexp   = hammer_vfs_checkexp
 273 };
 274
 275 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
 276
 277 VFS_SET(hammer_vfsops, hammer, 0);
 278 MODULE_VERSION(hammer, 1);
 279
 280 static int
 281 hammer_vfs_init(struct vfsconf *conf)
 282 {
 283         int n;
 284
 285         if (hammer_limit_recs == 0) {
 286                 hammer_limit_recs = nbuf * 25;
 287                 n = kmalloc_limit(M_HAMMER) / 512;
 288                 if (hammer_limit_recs > n)
 289                         hammer_limit_recs = n;
 290         }
 291         if (hammer_limit_dirtybufspace == 0) {
 292                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
 293                 if (hammer_limit_dirtybufspace < 100)
 294                         hammer_limit_dirtybufspace = 100;
 295         }
 296         return(0);
 297 }
 298
 299 static int
 300 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
 301                  struct ucred *cred)
 302 {
 303         struct hammer_mount_info info;
 304         hammer_mount_t hmp;
 305         hammer_volume_t rootvol;
 306         struct vnode *rootvp;
 307         struct vnode *devvp = NULL;
 308         const char *upath;      /* volume name in userspace */
 309         char *path;             /* volume name in system space */
 310         int error;
 311         int i;
 312         int master_id;
 313         int maxinodes;
 314
 315         /*
 316          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
 317          */
 318         if (mntpt == NULL) {
 319                 if ((error = bdevvp(rootdev, &devvp))) {
 320                         kprintf("hammer_mountroot: can't find devvp\n");
 321                         return (error);
 322                 }
 323                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
 324                 bzero(&info, sizeof(info));
 325                 info.asof = 0;
 326                 info.hflags = 0;
 327                 info.nvolumes = 1;
 328         } else {
 329                 if ((error = copyin(data, &info, sizeof(info))) != 0)
 330                         return (error);
 331         }
 332
 333         /*
 334          * updating or new mount
 335          */
 336         if (mp->mnt_flag & MNT_UPDATE) {
 337                 hmp = (void *)mp->mnt_data;
 338                 KKASSERT(hmp != NULL);
 339         } else {
 340                 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
 341                         return (EINVAL);
 342                 hmp = NULL;
 343         }
 344
 345         /*
 346          * master-id validation.  The master id may not be changed by a
 347          * mount update.
 348          */
 349         if (info.hflags & HMNT_MASTERID) {
 350                 if (hmp && hmp->master_id != info.master_id) {
 351                         kprintf("hammer: cannot change master id "
 352                                 "with mount update\n");
 353                         return(EINVAL);
 354                 }
 355                 master_id = info.master_id;
 356                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
 357                         return (EINVAL);
 358         } else {
 359                 if (hmp)
 360                         master_id = hmp->master_id;
 361                 else
 362                         master_id = 0;
 363         }
 364
 365         /*
 366          * Interal mount data structure
 367          */
 368         if (hmp == NULL) {
 369                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
 370                 mp->mnt_data = (qaddr_t)hmp;
 371                 hmp->mp = mp;
 372                 /*TAILQ_INIT(&hmp->recycle_list);*/
 373
 374                 /*
 375                  * Make sure kmalloc type limits are set appropriately.  If root
 376                  * increases the vnode limit you may have to do a dummy remount
 377                  * to adjust the HAMMER inode limit.
 378                  */
 379                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
 380                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
 381
 382                 maxinodes = desiredvnodes + desiredvnodes / 5 +
 383                             hammer_limit_reclaim * 2;
 384                 kmalloc_raise_limit(hmp->m_inodes,
 385                                     maxinodes * sizeof(struct hammer_inode));
 386
 387                 hmp->root_btree_beg.localization = 0x00000000U;
 388                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
 389                 hmp->root_btree_beg.key = -0x8000000000000000LL;
 390                 hmp->root_btree_beg.create_tid = 1;
 391                 hmp->root_btree_beg.delete_tid = 1;
 392                 hmp->root_btree_beg.rec_type = 0;
 393                 hmp->root_btree_beg.obj_type = 0;
 394
 395                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
 396                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
 397                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
 398                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
 399                 hmp->root_btree_end.delete_tid = 0;   /* special case */
 400                 hmp->root_btree_end.rec_type = 0xFFFFU;
 401                 hmp->root_btree_end.obj_type = 0;
 402
 403                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
 404                 hmp->krate.count = -16; /* initial burst */
 405
 406                 hmp->sync_lock.refs = 1;
 407                 hmp->free_lock.refs = 1;
 408                 hmp->undo_lock.refs = 1;
 409                 hmp->blkmap_lock.refs = 1;
 410                 hmp->snapshot_lock.refs = 1;
 411
 412                 TAILQ_INIT(&hmp->delay_list);
 413                 TAILQ_INIT(&hmp->flush_group_list);
 414                 TAILQ_INIT(&hmp->objid_cache_list);
 415                 TAILQ_INIT(&hmp->undo_lru_list);
 416                 TAILQ_INIT(&hmp->reclaim_list);
 417         }
 418         hmp->hflags &= ~HMNT_USERFLAGS;
 419         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
 420
 421         hmp->master_id = master_id;
 422
 423         if (info.asof) {
 424                 mp->mnt_flag |= MNT_RDONLY;
 425                 hmp->asof = info.asof;
 426         } else {
 427                 hmp->asof = HAMMER_MAX_TID;
 428         }
 429
 430         /*
 431          * Re-open read-write if originally read-only, or vise-versa.
 432          *
 433          * When going from read-only to read-write execute the stage2
 434          * recovery if it has not already been run.
 435          */
 436         if (mp->mnt_flag & MNT_UPDATE) {
 437                 error = 0;
 438                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 439                         kprintf("HAMMER read-only -> read-write\n");
 440                         hmp->ronly = 0;
 441                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 442                                 hammer_adjust_volume_mode, NULL);
 443                         rootvol = hammer_get_root_volume(hmp, &error);
 444                         if (rootvol) {
 445                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
 446                                 error = hammer_recover_stage2(hmp, rootvol);
 447                                 bcopy(rootvol->ondisk->vol0_blockmap,
 448                                       hmp->blockmap,
 449                                       sizeof(hmp->blockmap));
 450                                 hammer_rel_volume(rootvol, 0);
 451                         }
 452                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 453                                 hammer_reload_inode, NULL);
 454                         /* kernel clears MNT_RDONLY */
 455                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 456                         kprintf("HAMMER read-write -> read-only\n");
 457                         hmp->ronly = 1; /* messy */
 458                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 459                                 hammer_reload_inode, NULL);
 460                         hmp->ronly = 0;
 461                         hammer_flusher_sync(hmp);
 462                         hammer_flusher_sync(hmp);
 463                         hammer_flusher_sync(hmp);
 464                         hmp->ronly = 1;
 465                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 466                                 hammer_adjust_volume_mode, NULL);
 467                 }
 468                 return(error);
 469         }
 470
 471         RB_INIT(&hmp->rb_vols_root);
 472         RB_INIT(&hmp->rb_inos_root);
 473         RB_INIT(&hmp->rb_nods_root);
 474         RB_INIT(&hmp->rb_undo_root);
 475         RB_INIT(&hmp->rb_resv_root);
 476         RB_INIT(&hmp->rb_bufs_root);
 477         RB_INIT(&hmp->rb_pfsm_root);
 478
 479         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 480
 481         TAILQ_INIT(&hmp->volu_list);
 482         TAILQ_INIT(&hmp->undo_list);
 483         TAILQ_INIT(&hmp->data_list);
 484         TAILQ_INIT(&hmp->meta_list);
 485         TAILQ_INIT(&hmp->lose_list);
 486
 487         /*
 488          * Load volumes
 489          */
 490         path = objcache_get(namei_oc, M_WAITOK);
 491         hmp->nvolumes = -1;
 492         for (i = 0; i < info.nvolumes; ++i) {
 493                 if (mntpt == NULL) {
 494                         /*
 495                          * Root mount.
 496                          * Only one volume; and no need for copyin.
 497                          */
 498                         KKASSERT(info.nvolumes == 1);
 499                         ksnprintf(path, MAXPATHLEN, "/dev/%s",
 500                                   mp->mnt_stat.f_mntfromname);
 501                         error = 0;
 502                 } else {
 503                         error = copyin(&info.volumes[i], &upath,
 504                                        sizeof(char *));
 505                         if (error == 0)
 506                                 error = copyinstr(upath, path,
 507                                                   MAXPATHLEN, NULL);
 508                 }
 509                 if (error == 0)
 510                         error = hammer_install_volume(hmp, path, devvp);
 511                 if (error)
 512                         break;
 513         }
 514         objcache_put(namei_oc, path);
 515
 516         /*
 517          * Make sure we found a root volume
 518          */
 519         if (error == 0 && hmp->rootvol == NULL) {
 520                 kprintf("hammer_mount: No root volume found!\n");
 521                 error = EINVAL;
 522         }
 523
 524         /*
 525          * Check that all required volumes are available
 526          */
 527         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
 528                 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
 529                 error = EINVAL;
 530         }
 531
 532         if (error) {
 533                 hammer_free_hmp(mp);
 534                 return (error);
 535         }
 536
 537         /*
 538          * No errors, setup enough of the mount point so we can lookup the
 539          * root vnode.
 540          */
 541         mp->mnt_iosize_max = MAXPHYS;
 542         mp->mnt_kern_flag |= MNTK_FSMID;
 543
 544         /*
 545          * note: f_iosize is used by vnode_pager_haspage() when constructing
 546          * its VOP_BMAP call.
 547          */
 548         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 549         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 550
 551         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
 552         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
 553
 554         mp->mnt_maxsymlinklen = 255;
 555         mp->mnt_flag |= MNT_LOCAL;
 556
 557         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 558         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 559         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 560
 561         /*
 562          * The root volume's ondisk pointer is only valid if we hold a
 563          * reference to it.
 564          */
 565         rootvol = hammer_get_root_volume(hmp, &error);
 566         if (error)
 567                 goto failed;
 568
 569         /*
 570          * Perform any necessary UNDO operations.  The recovery code does
 571          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
 572          * and then re-copy it again after recovery is complete.
 573          *
 574          * If this is a read-only mount the UNDO information is retained
 575          * in memory in the form of dirty buffer cache buffers, and not
 576          * written back to the media.
 577          */
 578         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 579               sizeof(hmp->blockmap));
 580
 581         /*
 582          * Check filesystem version
 583          */
 584         hmp->version = rootvol->ondisk->vol_version;
 585         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
 586             hmp->version > HAMMER_VOL_VERSION_MAX) {
 587                 kprintf("HAMMER: mount unsupported fs version %d\n",
 588                         hmp->version);
 589                 error = ERANGE;
 590                 goto done;
 591         }
 592
 593         /*
 594          * The undo_rec_limit limits the size of flush groups to avoid
 595          * blowing out the UNDO FIFO.  This calculation is typically in
 596          * the tens of thousands and is designed primarily when small
 597          * HAMMER filesystems are created.
 598          */
 599         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
 600         if (hammer_debug_general & 0x0001)
 601                 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
 602
 603         /*
 604          * NOTE: Recover stage1 not only handles meta-data recovery, it
 605          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
 606          */
 607         error = hammer_recover_stage1(hmp, rootvol);
 608         if (error) {
 609                 kprintf("Failed to recover HAMMER filesystem on mount\n");
 610                 goto done;
 611         }
 612
 613         /*
 614          * Finish setup now that we have a good root volume.
 615          *
 616          * The top 16 bits of fsid.val[1] is a pfs id.
 617          */
 618         ksnprintf(mp->mnt_stat.f_mntfromname,
 619                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 620                   rootvol->ondisk->vol_name);
 621         mp->mnt_stat.f_fsid.val[0] =
 622                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
 623         mp->mnt_stat.f_fsid.val[1] =
 624                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
 625         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
 626
 627         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
 628         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
 629                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
 630
 631         /*
 632          * Certain often-modified fields in the root volume are cached in
 633          * the hammer_mount structure so we do not have to generate lots
 634          * of little UNDO structures for them.
 635          *
 636          * Recopy after recovery.  This also has the side effect of
 637          * setting our cached undo FIFO's first_offset, which serves to
 638          * placemark the FIFO start for the NEXT flush cycle while the
 639          * on-disk first_offset represents the LAST flush cycle.
 640          */
 641         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
 642         hmp->flush_tid1 = hmp->next_tid;
 643         hmp->flush_tid2 = hmp->next_tid;
 644         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 645               sizeof(hmp->blockmap));
 646         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
 647
 648         hammer_flusher_create(hmp);
 649
 650         /*
 651          * Locate the root directory using the root cluster's B-Tree as a
 652          * starting point.  The root directory uses an obj_id of 1.
 653          *
 654          * FUTURE: Leave the root directory cached referenced but unlocked
 655          * in hmp->rootvp (need to flush it on unmount).
 656          */
 657         error = hammer_vfs_vget(mp, NULL, 1, &rootvp);
 658         if (error)
 659                 goto done;
 660         vput(rootvp);
 661         /*vn_unlock(hmp->rootvp);*/
 662         error = hammer_recover_stage2(hmp, rootvol);
 663
 664 done:
 665         hammer_rel_volume(rootvol, 0);
 666 failed:
 667         /*
 668          * Cleanup and return.
 669          */
 670         if (error)
 671                 hammer_free_hmp(mp);
 672         return (error);
 673 }
 674
 675 static int
 676 hammer_vfs_unmount(struct mount *mp, int mntflags)
 677 {
 678 #if 0
 679         struct hammer_mount *hmp = (void *)mp->mnt_data;
 680 #endif
 681         int flags;
 682         int error;
 683
 684         /*
 685          * Clean out the vnodes
 686          */
 687         flags = 0;
 688         if (mntflags & MNT_FORCE)
 689                 flags |= FORCECLOSE;
 690         if ((error = vflush(mp, 0, flags)) != 0)
 691                 return (error);
 692
 693         /*
 694          * Clean up the internal mount structure and related entities.  This
 695          * may issue I/O.
 696          */
 697         hammer_free_hmp(mp);
 698         return(0);
 699 }
 700
 701 /*
 702  * Clean up the internal mount structure and disassociate it from the mount.
 703  * This may issue I/O.
 704  */
 705 static void
 706 hammer_free_hmp(struct mount *mp)
 707 {
 708         struct hammer_mount *hmp = (void *)mp->mnt_data;
 709         hammer_flush_group_t flg;
 710         int count;
 711         int dummy;
 712
 713         /*
 714          * Flush anything dirty.  This won't even run if the
 715          * filesystem errored-out.
 716          */
 717         count = 0;
 718         while (hammer_flusher_haswork(hmp)) {
 719                 hammer_flusher_sync(hmp);
 720                 ++count;
 721                 if (count >= 5) {
 722                         if (count == 5)
 723                                 kprintf("HAMMER: umount flushing.");
 724                         else
 725                                 kprintf(".");
 726                         tsleep(&dummy, 0, "hmrufl", hz);
 727                 }
 728                 if (count == 30) {
 729                         kprintf("giving up\n");
 730                         break;
 731                 }
 732         }
 733         if (count >= 5 && count < 30)
 734                 kprintf("\n");
 735
 736         /*
 737          * If the mount had a critical error we have to destroy any
 738          * remaining inodes before we can finish cleaning up the flusher.
 739          */
 740         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
 741                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 742                         hammer_destroy_inode_callback, NULL);
 743         }
 744
 745         /*
 746          * There shouldn't be any inodes left now and any left over
 747          * flush groups should now be empty.
 748          */
 749         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
 750         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
 751                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
 752                 KKASSERT(RB_EMPTY(&flg->flush_tree));
 753                 if (flg->refs) {
 754                         kprintf("HAMMER: Warning, flush_group %p was "
 755                                 "not empty on umount!\n", flg);
 756                 }
 757                 kfree(flg, hmp->m_misc);
 758         }
 759
 760         /*
 761          * We can finally destroy the flusher
 762          */
 763         hammer_flusher_destroy(hmp);
 764
 765         /*
 766          * We may have held recovered buffers due to a read-only mount.
 767          * These must be discarded.
 768          */
 769         if (hmp->ronly)
 770                 hammer_recover_flush_buffers(hmp, NULL, -1);
 771
 772         /*
 773          * Unload buffers and then volumes
 774          */
 775         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 776                 hammer_unload_buffer, NULL);
 777         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 778                 hammer_unload_volume, NULL);
 779
 780         mp->mnt_data = NULL;
 781         mp->mnt_flag &= ~MNT_LOCAL;
 782         hmp->mp = NULL;
 783         hammer_destroy_objid_cache(hmp);
 784         kmalloc_destroy(&hmp->m_misc);
 785         kmalloc_destroy(&hmp->m_inodes);
 786         kfree(hmp, M_HAMMER);
 787 }
 788
 789 /*
 790  * Report critical errors.  ip may be NULL.
 791  */
 792 void
 793 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
 794                       int error, const char *msg)
 795 {
 796         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
 797
 798         krateprintf(&hmp->krate,
 799                     "HAMMER(%s): Critical error inode=%jd error=%d %s\n",
 800                     hmp->mp->mnt_stat.f_mntfromname,
 801                     (intmax_t)(ip ? ip->obj_id : -1),
 802                     error, msg);
 803
 804         if (hmp->ronly == 0) {
 805                 hmp->ronly = 2;         /* special errored read-only mode */
 806                 hmp->mp->mnt_flag |= MNT_RDONLY;
 807                 kprintf("HAMMER(%s): Forcing read-only mode\n",
 808                         hmp->mp->mnt_stat.f_mntfromname);
 809         }
 810         hmp->error = error;
 811         if (hammer_debug_critical)
 812                 Debugger("Entering debugger");
 813 }
 814
 815
 816 /*
 817  * Obtain a vnode for the specified inode number.  An exclusively locked
 818  * vnode is returned.
 819  */
 820 int
 821 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 822                 ino_t ino, struct vnode **vpp)
 823 {
 824         struct hammer_transaction trans;
 825         struct hammer_mount *hmp = (void *)mp->mnt_data;
 826         struct hammer_inode *ip;
 827         int error;
 828         u_int32_t localization;
 829
 830         hammer_simple_transaction(&trans, hmp);
 831
 832         /*
 833          * If a directory vnode is supplied (mainly NFS) then we can acquire
 834          * the PFS domain from it.  Otherwise we would only be able to vget
 835          * inodes in the root PFS.
 836          */
 837         if (dvp) {
 838                 localization = HAMMER_DEF_LOCALIZATION +
 839                                 VTOI(dvp)->obj_localization;
 840         } else {
 841                 localization = HAMMER_DEF_LOCALIZATION;
 842         }
 843
 844         /*
 845          * Lookup the requested HAMMER inode.  The structure must be
 846          * left unlocked while we manipulate the related vnode to avoid
 847          * a deadlock.
 848          */
 849         ip = hammer_get_inode(&trans, NULL, ino,
 850                               hmp->asof, localization,
 851                               0, &error);
 852         if (ip == NULL) {
 853                 *vpp = NULL;
 854                 hammer_done_transaction(&trans);
 855                 return(error);
 856         }
 857         error = hammer_get_vnode(ip, vpp);
 858         hammer_rel_inode(ip, 0);
 859         hammer_done_transaction(&trans);
 860         return (error);
 861 }
 862
 863 /*
 864  * Return the root vnode for the filesystem.
 865  *
 866  * HAMMER stores the root vnode in the hammer_mount structure so
 867  * getting it is easy.
 868  */
 869 static int
 870 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
 871 {
 872 #if 0
 873         struct hammer_mount *hmp = (void *)mp->mnt_data;
 874 #endif
 875         int error;
 876
 877         error = hammer_vfs_vget(mp, NULL, 1, vpp);
 878         return (error);
 879 }
 880
 881 static int
 882 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 883 {
 884         struct hammer_mount *hmp = (void *)mp->mnt_data;
 885         hammer_volume_t volume;
 886         hammer_volume_ondisk_t ondisk;
 887         int error;
 888         int64_t bfree;
 889         int64_t breserved;
 890
 891         volume = hammer_get_root_volume(hmp, &error);
 892         if (error)
 893                 return(error);
 894         ondisk = volume->ondisk;
 895
 896         /*
 897          * Basic stats
 898          */
 899         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
 900         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
 901         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 902         hammer_rel_volume(volume, 0);
 903
 904         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
 905         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 906         if (mp->mnt_stat.f_files < 0)
 907                 mp->mnt_stat.f_files = 0;
 908
 909         *sbp = mp->mnt_stat;
 910         return(0);
 911 }
 912
 913 static int
 914 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 915 {
 916         struct hammer_mount *hmp = (void *)mp->mnt_data;
 917         hammer_volume_t volume;
 918         hammer_volume_ondisk_t ondisk;
 919         int error;
 920         int64_t bfree;
 921         int64_t breserved;
 922
 923         volume = hammer_get_root_volume(hmp, &error);
 924         if (error)
 925                 return(error);
 926         ondisk = volume->ondisk;
 927
 928         /*
 929          * Basic stats
 930          */
 931         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
 932         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
 933         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 934         hammer_rel_volume(volume, 0);
 935
 936         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
 937         mp->mnt_vstat.f_bavail = mp->mnt_stat.f_bfree;
 938         if (mp->mnt_vstat.f_files < 0)
 939                 mp->mnt_vstat.f_files = 0;
 940         *sbp = mp->mnt_vstat;
 941         return(0);
 942 }
 943
 944 /*
 945  * Sync the filesystem.  Currently we have to run it twice, the second
 946  * one will advance the undo start index to the end index, so if a crash
 947  * occurs no undos will be run on mount.
 948  *
 949  * We do not sync the filesystem if we are called from a panic.  If we did
 950  * we might end up blowing up a sync that was already in progress.
 951  */
 952 static int
 953 hammer_vfs_sync(struct mount *mp, int waitfor)
 954 {
 955         struct hammer_mount *hmp = (void *)mp->mnt_data;
 956         int error;
 957
 958         if (panicstr == NULL) {
 959                 error = hammer_sync_hmp(hmp, waitfor);
 960         } else {
 961                 error = EIO;
 962         }
 963         return (error);
 964 }
 965
 966 /*
 967  * Convert a vnode to a file handle.
 968  */
 969 static int
 970 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
 971 {
 972         hammer_inode_t ip;
 973
 974         KKASSERT(MAXFIDSZ >= 16);
 975         ip = VTOI(vp);
 976         fhp->fid_len = offsetof(struct fid, fid_data[16]);
 977         fhp->fid_ext = ip->obj_localization >> 16;
 978         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
 979         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
 980         return(0);
 981 }
 982
 983
 984 /*
 985  * Convert a file handle back to a vnode.
 986  *
 987  * Use rootvp to enforce PFS isolation when a PFS is exported via a
 988  * null mount.
 989  */
 990 static int
 991 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 992                   struct fid *fhp, struct vnode **vpp)
 993 {
 994         struct hammer_transaction trans;
 995         struct hammer_inode *ip;
 996         struct hammer_inode_info info;
 997         int error;
 998         u_int32_t localization;
 999
1000         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1001         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1002         if (rootvp)
1003                 localization = VTOI(rootvp)->obj_localization;
1004         else
1005                 localization = (u_int32_t)fhp->fid_ext << 16;
1006
1007         hammer_simple_transaction(&trans, (void *)mp->mnt_data);
1008
1009         /*
1010          * Get/allocate the hammer_inode structure.  The structure must be
1011          * unlocked while we manipulate the related vnode to avoid a
1012          * deadlock.
1013          */
1014         ip = hammer_get_inode(&trans, NULL, info.obj_id,
1015                               info.obj_asof, localization, 0, &error);
1016         if (ip == NULL) {
1017                 *vpp = NULL;
1018                 return(error);
1019         }
1020         error = hammer_get_vnode(ip, vpp);
1021         hammer_rel_inode(ip, 0);
1022         hammer_done_transaction(&trans);
1023         return (error);
1024 }
1025
1026 static int
1027 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1028                     int *exflagsp, struct ucred **credanonp)
1029 {
1030         hammer_mount_t hmp = (void *)mp->mnt_data;
1031         struct netcred *np;
1032         int error;
1033
1034         np = vfs_export_lookup(mp, &hmp->export, nam);
1035         if (np) {
1036                 *exflagsp = np->netc_exflags;
1037                 *credanonp = &np->netc_anon;
1038                 error = 0;
1039         } else {
1040                 error = EACCES;
1041         }
1042         return (error);
1043
1044 }
1045
1046 int
1047 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1048 {
1049         hammer_mount_t hmp = (void *)mp->mnt_data;
1050         int error;
1051
1052         switch(op) {
1053         case MOUNTCTL_SET_EXPORT:
1054                 error = vfs_export(mp, &hmp->export, export);
1055                 break;
1056         default:
1057                 error = EOPNOTSUPP;
1058                 break;
1059         }
1060         return(error);
1061 }
1062