sys/vfs/hammer2/hammer2_vfsops.c

   1 /*
   2  * Copyright (c) 2011-2014 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  * by Daniel Flores (GSOC 2013 - mentored by Matthew Dillon, compression)
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  * 3. Neither the name of The DragonFly Project nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific, prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  25  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  26  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  30  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  32  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/nlookup.h>
  39 #include <sys/vnode.h>
  40 #include <sys/mount.h>
  41 #include <sys/fcntl.h>
  42 #include <sys/buf.h>
  43 #include <sys/uuid.h>
  44 #include <sys/vfsops.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/socket.h>
  47 #include <sys/objcache.h>
  48
  49 #include <sys/proc.h>
  50 #include <sys/namei.h>
  51 #include <sys/mountctl.h>
  52 #include <sys/dirent.h>
  53 #include <sys/uio.h>
  54
  55 #include <sys/mutex.h>
  56 #include <sys/mutex2.h>
  57
  58 #include "hammer2.h"
  59 #include "hammer2_disk.h"
  60 #include "hammer2_mount.h"
  61
  62 #include "hammer2.h"
  63 #include "hammer2_lz4.h"
  64
  65 #include "zlib/hammer2_zlib.h"
  66
  67 #define REPORT_REFS_ERRORS 1    /* XXX remove me */
  68
  69 MALLOC_DEFINE(M_OBJCACHE, "objcache", "Object Cache");
  70
  71 struct hammer2_sync_info {
  72         hammer2_trans_t trans;
  73         int error;
  74         int waitfor;
  75 };
  76
  77 TAILQ_HEAD(hammer2_mntlist, hammer2_mount);
  78 TAILQ_HEAD(hammer2_pfslist, hammer2_pfsmount);
  79 static struct hammer2_mntlist hammer2_mntlist;
  80 static struct hammer2_pfslist hammer2_pfslist;
  81 static struct lock hammer2_mntlk;
  82
  83 int hammer2_debug;
  84 int hammer2_cluster_enable = 1;
  85 int hammer2_hardlink_enable = 1;
  86 int hammer2_flush_pipe = 100;
  87 int hammer2_synchronous_flush = 1;
  88 int hammer2_dio_count;
  89 long hammer2_limit_dirty_chains;
  90 long hammer2_iod_file_read;
  91 long hammer2_iod_meta_read;
  92 long hammer2_iod_indr_read;
  93 long hammer2_iod_fmap_read;
  94 long hammer2_iod_volu_read;
  95 long hammer2_iod_file_write;
  96 long hammer2_iod_meta_write;
  97 long hammer2_iod_indr_write;
  98 long hammer2_iod_fmap_write;
  99 long hammer2_iod_volu_write;
 100 long hammer2_ioa_file_read;
 101 long hammer2_ioa_meta_read;
 102 long hammer2_ioa_indr_read;
 103 long hammer2_ioa_fmap_read;
 104 long hammer2_ioa_volu_read;
 105 long hammer2_ioa_fmap_write;
 106 long hammer2_ioa_file_write;
 107 long hammer2_ioa_meta_write;
 108 long hammer2_ioa_indr_write;
 109 long hammer2_ioa_volu_write;
 110
 111 MALLOC_DECLARE(C_BUFFER);
 112 MALLOC_DEFINE(C_BUFFER, "compbuffer", "Buffer used for compression.");
 113
 114 MALLOC_DECLARE(D_BUFFER);
 115 MALLOC_DEFINE(D_BUFFER, "decompbuffer", "Buffer used for decompression.");
 116
 117 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
 118
 119 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
 120            &hammer2_debug, 0, "");
 121 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_enable, CTLFLAG_RW,
 122            &hammer2_cluster_enable, 0, "");
 123 SYSCTL_INT(_vfs_hammer2, OID_AUTO, hardlink_enable, CTLFLAG_RW,
 124            &hammer2_hardlink_enable, 0, "");
 125 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW,
 126            &hammer2_flush_pipe, 0, "");
 127 SYSCTL_INT(_vfs_hammer2, OID_AUTO, synchronous_flush, CTLFLAG_RW,
 128            &hammer2_synchronous_flush, 0, "");
 129 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW,
 130            &hammer2_limit_dirty_chains, 0, "");
 131 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD,
 132            &hammer2_dio_count, 0, "");
 133
 134 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
 135            &hammer2_iod_file_read, 0, "");
 136 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
 137            &hammer2_iod_meta_read, 0, "");
 138 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
 139            &hammer2_iod_indr_read, 0, "");
 140 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW,
 141            &hammer2_iod_fmap_read, 0, "");
 142 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW,
 143            &hammer2_iod_volu_read, 0, "");
 144
 145 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
 146            &hammer2_iod_file_write, 0, "");
 147 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
 148            &hammer2_iod_meta_write, 0, "");
 149 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
 150            &hammer2_iod_indr_write, 0, "");
 151 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW,
 152            &hammer2_iod_fmap_write, 0, "");
 153 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
 154            &hammer2_iod_volu_write, 0, "");
 155
 156 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_read, CTLFLAG_RW,
 157            &hammer2_ioa_file_read, 0, "");
 158 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_read, CTLFLAG_RW,
 159            &hammer2_ioa_meta_read, 0, "");
 160 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_read, CTLFLAG_RW,
 161            &hammer2_ioa_indr_read, 0, "");
 162 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_fmap_read, CTLFLAG_RW,
 163            &hammer2_ioa_fmap_read, 0, "");
 164 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_read, CTLFLAG_RW,
 165            &hammer2_ioa_volu_read, 0, "");
 166
 167 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_write, CTLFLAG_RW,
 168            &hammer2_ioa_file_write, 0, "");
 169 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_write, CTLFLAG_RW,
 170            &hammer2_ioa_meta_write, 0, "");
 171 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_write, CTLFLAG_RW,
 172            &hammer2_ioa_indr_write, 0, "");
 173 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_fmap_write, CTLFLAG_RW,
 174            &hammer2_ioa_fmap_write, 0, "");
 175 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_write, CTLFLAG_RW,
 176            &hammer2_ioa_volu_write, 0, "");
 177
 178 static int hammer2_vfs_init(struct vfsconf *conf);
 179 static int hammer2_vfs_uninit(struct vfsconf *vfsp);
 180 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 181                                 struct ucred *cred);
 182 static int hammer2_remount(hammer2_mount_t *, struct mount *, char *,
 183                                 struct vnode *, struct ucred *);
 184 static int hammer2_recovery(hammer2_mount_t *hmp);
 185 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
 186 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
 187 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
 188                                 struct ucred *cred);
 189 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 190                                 struct ucred *cred);
 191 static int hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 192                                 ino_t ino, struct vnode **vpp);
 193 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 194                                 struct fid *fhp, struct vnode **vpp);
 195 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 196 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 197                                 int *exflagsp, struct ucred **credanonp);
 198
 199 static int hammer2_install_volume_header(hammer2_mount_t *hmp);
 200 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
 201
 202 static void hammer2_write_thread(void *arg);
 203
 204 static void hammer2_vfs_unmount_hmp1(struct mount *mp, hammer2_mount_t *hmp);
 205 static void hammer2_vfs_unmount_hmp2(struct mount *mp, hammer2_mount_t *hmp);
 206
 207 /*
 208  * Functions for compression in threads,
 209  * from hammer2_vnops.c
 210  */
 211 static void hammer2_write_file_core(struct buf *bp, hammer2_trans_t *trans,
 212                                 hammer2_inode_t *ip,
 213                                 hammer2_inode_data_t *ipdata,
 214                                 hammer2_cluster_t *cparent,
 215                                 hammer2_key_t lbase, int ioflag, int pblksize,
 216                                 int *errorp);
 217 static void hammer2_compress_and_write(struct buf *bp, hammer2_trans_t *trans,
 218                                 hammer2_inode_t *ip,
 219                                 const hammer2_inode_data_t *ipdata,
 220                                 hammer2_cluster_t *cparent,
 221                                 hammer2_key_t lbase, int ioflag,
 222                                 int pblksize, int *errorp, int comp_algo);
 223 static void hammer2_zero_check_and_write(struct buf *bp,
 224                                 hammer2_trans_t *trans, hammer2_inode_t *ip,
 225                                 const hammer2_inode_data_t *ipdata,
 226                                 hammer2_cluster_t *cparent,
 227                                 hammer2_key_t lbase,
 228                                 int ioflag, int pblksize, int *errorp);
 229 static int test_block_zeros(const char *buf, size_t bytes);
 230 static void zero_write(struct buf *bp, hammer2_trans_t *trans,
 231                                 hammer2_inode_t *ip,
 232                                 const hammer2_inode_data_t *ipdata,
 233                                 hammer2_cluster_t *cparent,
 234                                 hammer2_key_t lbase,
 235                                 int *errorp);
 236 static void hammer2_write_bp(hammer2_cluster_t *cluster, struct buf *bp,
 237                                 int ioflag, int pblksize, int *errorp);
 238
 239 static int hammer2_rcvdmsg(kdmsg_msg_t *msg);
 240 static void hammer2_autodmsg(kdmsg_msg_t *msg);
 241 static int hammer2_lnk_span_reply(kdmsg_state_t *state, kdmsg_msg_t *msg);
 242
 243
 244 /*
 245  * HAMMER2 vfs operations.
 246  */
 247 static struct vfsops hammer2_vfsops = {
 248         .vfs_init       = hammer2_vfs_init,
 249         .vfs_uninit     = hammer2_vfs_uninit,
 250         .vfs_sync       = hammer2_vfs_sync,
 251         .vfs_mount      = hammer2_vfs_mount,
 252         .vfs_unmount    = hammer2_vfs_unmount,
 253         .vfs_root       = hammer2_vfs_root,
 254         .vfs_statfs     = hammer2_vfs_statfs,
 255         .vfs_statvfs    = hammer2_vfs_statvfs,
 256         .vfs_vget       = hammer2_vfs_vget,
 257         .vfs_vptofh     = hammer2_vfs_vptofh,
 258         .vfs_fhtovp     = hammer2_vfs_fhtovp,
 259         .vfs_checkexp   = hammer2_vfs_checkexp
 260 };
 261
 262 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
 263
 264 VFS_SET(hammer2_vfsops, hammer2, 0);
 265 MODULE_VERSION(hammer2, 1);
 266
 267 static
 268 int
 269 hammer2_vfs_init(struct vfsconf *conf)
 270 {
 271         static struct objcache_malloc_args margs_read;
 272         static struct objcache_malloc_args margs_write;
 273
 274         int error;
 275
 276         error = 0;
 277
 278         if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
 279                 error = EINVAL;
 280         if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
 281                 error = EINVAL;
 282         if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
 283                 error = EINVAL;
 284
 285         if (error)
 286                 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
 287
 288         margs_read.objsize = 65536;
 289         margs_read.mtype = D_BUFFER;
 290
 291         margs_write.objsize = 32768;
 292         margs_write.mtype = C_BUFFER;
 293
 294         cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc,
 295                                 0, 1, NULL, NULL, NULL, objcache_malloc_alloc,
 296                                 objcache_malloc_free, &margs_read);
 297         cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc,
 298                                 0, 1, NULL, NULL, NULL, objcache_malloc_alloc,
 299                                 objcache_malloc_free, &margs_write);
 300
 301         lockinit(&hammer2_mntlk, "mntlk", 0, 0);
 302         TAILQ_INIT(&hammer2_mntlist);
 303         TAILQ_INIT(&hammer2_pfslist);
 304
 305         hammer2_limit_dirty_chains = desiredvnodes / 10;
 306
 307         hammer2_trans_manage_init();
 308
 309         return (error);
 310 }
 311
 312 static
 313 int
 314 hammer2_vfs_uninit(struct vfsconf *vfsp __unused)
 315 {
 316         objcache_destroy(cache_buffer_read);
 317         objcache_destroy(cache_buffer_write);
 318         return 0;
 319 }
 320
 321 /*
 322  * Core PFS allocator.  Used to allocate the pmp structure for PFS cluster
 323  * mounts and the spmp structure for media (hmp) structures.
 324  */
 325 static hammer2_pfsmount_t *
 326 hammer2_pfsalloc(const hammer2_inode_data_t *ipdata, hammer2_tid_t alloc_tid)
 327 {
 328         hammer2_pfsmount_t *pmp;
 329
 330         pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
 331         kmalloc_create(&pmp->minode, "HAMMER2-inodes");
 332         kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
 333         lockinit(&pmp->lock, "pfslk", 0, 0);
 334         spin_init(&pmp->inum_spin);
 335         RB_INIT(&pmp->inum_tree);
 336         TAILQ_INIT(&pmp->unlinkq);
 337         spin_init(&pmp->unlinkq_spin);
 338
 339         pmp->alloc_tid = alloc_tid + 1;   /* our first media transaction id */
 340         pmp->flush_tid = pmp->alloc_tid;
 341         if (ipdata) {
 342                 pmp->inode_tid = ipdata->pfs_inum + 1;
 343                 pmp->pfs_clid = ipdata->pfs_clid;
 344         }
 345         mtx_init(&pmp->wthread_mtx);
 346         bioq_init(&pmp->wthread_bioq);
 347
 348         return pmp;
 349 }
 350
 351 /*
 352  * Mount or remount HAMMER2 fileystem from physical media
 353  *
 354  *      mountroot
 355  *              mp              mount point structure
 356  *              path            NULL
 357  *              data            <unused>
 358  *              cred            <unused>
 359  *
 360  *      mount
 361  *              mp              mount point structure
 362  *              path            path to mount point
 363  *              data            pointer to argument structure in user space
 364  *                      volume  volume path (device@LABEL form)
 365  *                      hflags  user mount flags
 366  *              cred            user credentials
 367  *
 368  * RETURNS:     0       Success
 369  *              !0      error number
 370  */
 371 static
 372 int
 373 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 374                   struct ucred *cred)
 375 {
 376         struct hammer2_mount_info info;
 377         hammer2_pfsmount_t *pmp;
 378         hammer2_pfsmount_t *spmp;
 379         hammer2_mount_t *hmp;
 380         hammer2_key_t key_next;
 381         hammer2_key_t key_dummy;
 382         hammer2_key_t lhc;
 383         struct vnode *devvp;
 384         struct nlookupdata nd;
 385         hammer2_chain_t *parent;
 386         hammer2_chain_t *rchain;
 387         hammer2_cluster_t *cluster;
 388         hammer2_cluster_t *cparent;
 389         const hammer2_inode_data_t *ipdata;
 390         hammer2_blockref_t bref;
 391         struct file *fp;
 392         char devstr[MNAMELEN];
 393         size_t size;
 394         size_t done;
 395         char *dev;
 396         char *label;
 397         int ronly = 1;
 398         int error;
 399         int cache_index;
 400         int ddflag;
 401         int i;
 402
 403         hmp = NULL;
 404         pmp = NULL;
 405         dev = NULL;
 406         label = NULL;
 407         devvp = NULL;
 408         cache_index = -1;
 409
 410         kprintf("hammer2_mount\n");
 411
 412         if (path == NULL) {
 413                 /*
 414                  * Root mount
 415                  */
 416                 bzero(&info, sizeof(info));
 417                 info.cluster_fd = -1;
 418                 return (EOPNOTSUPP);
 419         } else {
 420                 /*
 421                  * Non-root mount or updating a mount
 422                  */
 423                 error = copyin(data, &info, sizeof(info));
 424                 if (error)
 425                         return (error);
 426
 427                 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
 428                 if (error)
 429                         return (error);
 430
 431                 /* Extract device and label */
 432                 dev = devstr;
 433                 label = strchr(devstr, '@');
 434                 if (label == NULL ||
 435                     ((label + 1) - dev) > done) {
 436                         return (EINVAL);
 437                 }
 438                 *label = '\0';
 439                 label++;
 440                 if (*label == '\0')
 441                         return (EINVAL);
 442
 443                 if (mp->mnt_flag & MNT_UPDATE) {
 444                         /* Update mount */
 445                         /* HAMMER2 implements NFS export via mountctl */
 446                         pmp = MPTOPMP(mp);
 447                         for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
 448                                 hmp = pmp->iroot->cluster.array[i]->hmp;
 449                                 devvp = hmp->devvp;
 450                                 error = hammer2_remount(hmp, mp, path,
 451                                                         devvp, cred);
 452                                 if (error)
 453                                         break;
 454                         }
 455                         /*hammer2_inode_install_hidden(pmp);*/
 456
 457                         return error;
 458                 }
 459         }
 460
 461         /*
 462          * HMP device mount
 463          *
 464          * Lookup name and verify it refers to a block device.
 465          */
 466         error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
 467         if (error == 0)
 468                 error = nlookup(&nd);
 469         if (error == 0)
 470                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 471         nlookup_done(&nd);
 472
 473         if (error == 0) {
 474                 if (vn_isdisk(devvp, &error))
 475                         error = vfs_mountedon(devvp);
 476         }
 477
 478         /*
 479          * Determine if the device has already been mounted.  After this
 480          * check hmp will be non-NULL if we are doing the second or more
 481          * hammer2 mounts from the same device.
 482          */
 483         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 484         TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
 485                 if (hmp->devvp == devvp)
 486                         break;
 487         }
 488
 489         /*
 490          * Open the device if this isn't a secondary mount and construct
 491          * the H2 device mount (hmp).
 492          */
 493         if (hmp == NULL) {
 494                 hammer2_chain_t *schain;
 495                 hammer2_xid_t xid;
 496
 497                 if (error == 0 && vcount(devvp) > 0)
 498                         error = EBUSY;
 499
 500                 /*
 501                  * Now open the device
 502                  */
 503                 if (error == 0) {
 504                         ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 505                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 506                         error = vinvalbuf(devvp, V_SAVE, 0, 0);
 507                         if (error == 0) {
 508                                 error = VOP_OPEN(devvp,
 509                                                  ronly ? FREAD : FREAD | FWRITE,
 510                                                  FSCRED, NULL);
 511                         }
 512                         vn_unlock(devvp);
 513                 }
 514                 if (error && devvp) {
 515                         vrele(devvp);
 516                         devvp = NULL;
 517                 }
 518                 if (error) {
 519                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 520                         return error;
 521                 }
 522                 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
 523                 hmp->ronly = ronly;
 524                 hmp->devvp = devvp;
 525                 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
 526                 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
 527                 RB_INIT(&hmp->iotree);
 528
 529                 lockinit(&hmp->vollk, "h2vol", 0, 0);
 530
 531                 /*
 532                  * vchain setup. vchain.data is embedded.
 533                  * vchain.refs is initialized and will never drop to 0.
 534                  *
 535                  * NOTE! voldata is not yet loaded.
 536                  */
 537                 hmp->vchain.hmp = hmp;
 538                 hmp->vchain.refs = 1;
 539                 hmp->vchain.data = (void *)&hmp->voldata;
 540                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
 541                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 542                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
 543                 hmp->vchain.delete_xid = HAMMER2_XID_MAX;
 544
 545                 hammer2_chain_core_alloc(NULL, &hmp->vchain, NULL);
 546                 /* hmp->vchain.u.xxx is left NULL */
 547
 548                 /*
 549                  * fchain setup.  fchain.data is embedded.
 550                  * fchain.refs is initialized and will never drop to 0.
 551                  *
 552                  * The data is not used but needs to be initialized to
 553                  * pass assertion muster.  We use this chain primarily
 554                  * as a placeholder for the freemap's top-level RBTREE
 555                  * so it does not interfere with the volume's topology
 556                  * RBTREE.
 557                  */
 558                 hmp->fchain.hmp = hmp;
 559                 hmp->fchain.refs = 1;
 560                 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
 561                 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
 562                 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 563                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
 564                 hmp->fchain.bref.methods =
 565                         HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
 566                         HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
 567                 hmp->fchain.delete_xid = HAMMER2_XID_MAX;
 568
 569                 hammer2_chain_core_alloc(NULL, &hmp->fchain, NULL);
 570                 /* hmp->fchain.u.xxx is left NULL */
 571
 572                 /*
 573                  * Install the volume header and initialize fields from
 574                  * voldata.
 575                  */
 576                 error = hammer2_install_volume_header(hmp);
 577                 if (error) {
 578                         ++hmp->pmp_count;
 579                         hammer2_vfs_unmount_hmp1(mp, hmp);
 580                         hammer2_vfs_unmount_hmp2(mp, hmp);
 581                         hammer2_vfs_unmount(mp, MNT_FORCE);
 582                         return error;
 583                 }
 584
 585                 /*
 586                  * Really important to get these right or flush will get
 587                  * confused.
 588                  */
 589                 hmp->spmp = hammer2_pfsalloc(NULL, hmp->voldata.mirror_tid);
 590                 kprintf("alloc spmp %p tid %016jx\n",
 591                         hmp->spmp, hmp->voldata.mirror_tid);
 592                 spmp = hmp->spmp;
 593                 spmp->inode_tid = 1;
 594
 595                 xid = 0;
 596                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
 597                 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid;
 598                 hmp->vchain.modify_xid = xid;
 599                 hmp->vchain.update_xlo = xid;
 600                 hmp->vchain.update_xhi = xid;
 601                 hmp->vchain.pmp = spmp;
 602                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
 603                 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid;
 604                 hmp->fchain.modify_xid = xid;
 605                 hmp->fchain.update_xlo = xid;
 606                 hmp->fchain.update_xhi = xid;
 607                 hmp->fchain.pmp = spmp;
 608
 609                 /*
 610                  * First locate the super-root inode, which is key 0
 611                  * relative to the volume header's blockset.
 612                  *
 613                  * Then locate the root inode by scanning the directory keyspace
 614                  * represented by the label.
 615                  */
 616                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
 617                 schain = hammer2_chain_lookup(&parent, &key_dummy,
 618                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
 619                                       &cache_index, 0, &ddflag);
 620                 hammer2_chain_lookup_done(parent);
 621                 if (schain == NULL) {
 622                         kprintf("hammer2_mount: invalid super-root\n");
 623                         ++hmp->pmp_count;
 624                         hammer2_vfs_unmount_hmp1(mp, hmp);
 625                         hammer2_vfs_unmount_hmp2(mp, hmp);
 626                         hammer2_vfs_unmount(mp, MNT_FORCE);
 627                         return EINVAL;
 628                 }
 629
 630                 /*
 631                  * Sanity-check schain's pmp, finish initializing spmp.
 632                  */
 633                 KKASSERT(schain->pmp == spmp);
 634                 spmp->pfs_clid = schain->data->ipdata.pfs_clid;
 635
 636                 /*
 637                  * NOTE: The CHAIN_PFSROOT is not set on the super-root inode.
 638                  * NOTE: inode_get sucks up schain's lock.
 639                  */
 640                 cluster = hammer2_cluster_from_chain(schain);
 641                 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster);
 642                 spmp->spmp_hmp = hmp;
 643                 hammer2_inode_ref(spmp->iroot);
 644                 hammer2_inode_unlock_ex(spmp->iroot, cluster);
 645                 schain = NULL;
 646                 /* leave spmp->iroot with one ref */
 647
 648                 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
 649                         error = hammer2_recovery(hmp);
 650                         /* XXX do something with error */
 651                 }
 652                 ++hmp->pmp_count;
 653
 654                 /*
 655                  * XXX RDONLY stuff is totally broken FIXME XXX
 656                  *
 657                  * Automatic LNK_CONN
 658                  * Automatic handling of received LNK_SPAN
 659                  * Automatic handling of received LNK_CIRC
 660                  * No automatic LNK_SPAN generation - we do this ourselves
 661                  * No automatic LNK_CIRC generation - we do this ourselves
 662                  */
 663                 kdmsg_iocom_init(&hmp->iocom, hmp,
 664                                  KDMSG_IOCOMF_AUTOCONN |
 665                                  KDMSG_IOCOMF_AUTORXSPAN |
 666                                  KDMSG_IOCOMF_AUTORXCIRC,
 667                                  hmp->mchain, hammer2_rcvdmsg);
 668
 669                 /*
 670                  * Ref the cluster management messaging descriptor.  The mount
 671                  * program deals with the other end of the communications pipe.
 672                  */
 673                 fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
 674                 if (fp) {
 675                         hammer2_cluster_reconnect(hmp, fp);
 676                 } else {
 677                         kprintf("hammer2_mount: bad cluster_fd!\n");
 678                 }
 679         } else {
 680                 spmp = hmp->spmp;
 681                 ++hmp->pmp_count;
 682         }
 683
 684         /*
 685          * Lookup mount point under the media-localized super-root.
 686          *
 687          * cluster->pmp will incorrectly point to spmp and must be fixed
 688          * up later on.
 689          */
 690         cparent = hammer2_inode_lock_ex(spmp->iroot);
 691         lhc = hammer2_dirhash(label, strlen(label));
 692         cluster = hammer2_cluster_lookup(cparent, &key_next,
 693                                       lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 694                                       0, &ddflag);
 695         while (cluster) {
 696                 if (hammer2_cluster_type(cluster) == HAMMER2_BREF_TYPE_INODE &&
 697                     strcmp(label,
 698                        hammer2_cluster_data(cluster)->ipdata.filename) == 0) {
 699                         break;
 700                 }
 701                 cluster = hammer2_cluster_next(cparent, cluster, &key_next,
 702                                             key_next,
 703                                             lhc + HAMMER2_DIRHASH_LOMASK, 0);
 704         }
 705         hammer2_inode_unlock_ex(spmp->iroot, cparent);
 706
 707         if (cluster == NULL) {
 708                 kprintf("hammer2_mount: PFS label not found\n");
 709                 hammer2_vfs_unmount_hmp1(mp, hmp);
 710                 hammer2_vfs_unmount_hmp2(mp, hmp);
 711                 lockmgr(&hammer2_mntlk, LK_RELEASE);
 712                 hammer2_vfs_unmount(mp, MNT_FORCE);
 713                 return EINVAL;
 714         }
 715
 716         for (i = 0; i < cluster->nchains; ++i) {
 717                 rchain = cluster->array[i];
 718                 KKASSERT(rchain->pmp == NULL);
 719                 if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
 720                         kprintf("hammer2_mount: PFS label already mounted!\n");
 721                         hammer2_cluster_unlock(cluster);
 722                         hammer2_vfs_unmount_hmp1(mp, hmp);
 723                         hammer2_vfs_unmount_hmp2(mp, hmp);
 724                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 725                         hammer2_vfs_unmount(mp, MNT_FORCE);
 726                         return EBUSY;
 727                 }
 728 #if 0
 729                 if (rchain->flags & HAMMER2_CHAIN_RECYCLE) {
 730                         kprintf("hammer2_mount: PFS label is recycling\n");
 731                         hammer2_cluster_unlock(cluster);
 732                         hammer2_vfs_unmount_hmp1(mp, hmp);
 733                         hammer2_vfs_unmount_hmp2(mp, hmp);
 734                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 735                         hammer2_vfs_unmount(mp, MNT_FORCE);
 736                         return EBUSY;
 737                 }
 738 #endif
 739         }
 740
 741         /*
 742          * Check to see if the cluster id is already mounted at the mount
 743          * point.  If it is, add us to the cluster.
 744          */
 745         ipdata = &hammer2_cluster_data(cluster)->ipdata;
 746         hammer2_cluster_bref(cluster, &bref);
 747         TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
 748                 if (pmp->spmp_hmp == NULL &&
 749                     bcmp(&pmp->pfs_clid, &ipdata->pfs_clid,
 750                          sizeof(pmp->pfs_clid)) == 0) {
 751                         break;
 752                 }
 753         }
 754
 755         if (pmp) {
 756                 int i;
 757                 int j;
 758
 759                 hammer2_inode_ref(pmp->iroot);
 760                 ccms_thread_lock(&pmp->iroot->topo_cst, CCMS_STATE_EXCLUSIVE);
 761
 762                 if (pmp->iroot->cluster.nchains + cluster->nchains >
 763                     HAMMER2_MAXCLUSTER) {
 764                         kprintf("hammer2_mount: cluster full!\n");
 765
 766                         ccms_thread_unlock(&pmp->iroot->topo_cst);
 767                         hammer2_inode_drop(pmp->iroot);
 768
 769                         hammer2_cluster_unlock(cluster);
 770                         hammer2_vfs_unmount_hmp1(mp, hmp);
 771                         hammer2_vfs_unmount_hmp2(mp, hmp);
 772                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 773                         hammer2_vfs_unmount(mp, MNT_FORCE);
 774                         return EBUSY;
 775                 }
 776                 kprintf("hammer2_vfs_mount: Adding pfs to existing cluster\n");
 777                 j = pmp->iroot->cluster.nchains;
 778                 for (i = 0; i < cluster->nchains; ++i) {
 779                         rchain = cluster->array[i];
 780                         KKASSERT(rchain->pmp == NULL);
 781                         rchain->pmp = pmp;
 782                         hammer2_chain_ref(cluster->array[i]);
 783                         pmp->iroot->cluster.array[j] = cluster->array[i];
 784                         ++j;
 785                 }
 786                 pmp->iroot->cluster.nchains = j;
 787                 ccms_thread_unlock(&pmp->iroot->topo_cst);
 788                 hammer2_inode_drop(pmp->iroot);
 789                 hammer2_cluster_unlock(cluster);
 790                 lockmgr(&hammer2_mntlk, LK_RELEASE);
 791
 792                 kprintf("ok\n");
 793                 hammer2_inode_install_hidden(pmp);
 794
 795                 return ERANGE;
 796         }
 797
 798         /*
 799          * Block device opened successfully, finish initializing the
 800          * mount structure.
 801          *
 802          * From this point on we have to call hammer2_unmount() on failure.
 803          */
 804         pmp = hammer2_pfsalloc(ipdata, bref.mirror_tid);
 805         kprintf("PMP mirror_tid is %016jx\n", bref.mirror_tid);
 806         for (i = 0; i < cluster->nchains; ++i) {
 807                 rchain = cluster->array[i];
 808                 KKASSERT(rchain->pmp == NULL);
 809                 rchain->pmp = pmp;
 810                 atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
 811         }
 812         cluster->pmp = pmp;
 813
 814         ccms_domain_init(&pmp->ccms_dom);
 815         TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry);
 816         lockmgr(&hammer2_mntlk, LK_RELEASE);
 817
 818         kprintf("hammer2_mount hmp=%p pmp=%p pmpcnt=%d\n",
 819                 hmp, pmp, hmp->pmp_count);
 820
 821         mp->mnt_flag = MNT_LOCAL;
 822         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
 823         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
 824
 825         /*
 826          * required mount structure initializations
 827          */
 828         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
 829         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
 830
 831         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
 832         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 833
 834         /*
 835          * Optional fields
 836          */
 837         mp->mnt_iosize_max = MAXPHYS;
 838         mp->mnt_data = (qaddr_t)pmp;
 839         pmp->mp = mp;
 840
 841         /*
 842          * After this point hammer2_vfs_unmount() has visibility on hmp
 843          * and manual hmp1/hmp2 calls are not needed on fatal errors.
 844          */
 845         pmp->iroot = hammer2_inode_get(pmp, NULL, cluster);
 846         hammer2_inode_ref(pmp->iroot);          /* ref for pmp->iroot */
 847         hammer2_inode_unlock_ex(pmp->iroot, cluster);
 848
 849         /*
 850          * The logical file buffer bio write thread handles things
 851          * like physical block assignment and compression.
 852          *
 853          * (only applicable to pfs mounts, not applicable to spmp)
 854          */
 855         pmp->wthread_destroy = 0;
 856         lwkt_create(hammer2_write_thread, pmp,
 857                     &pmp->wthread_td, NULL, 0, -1, "hwrite-%s", label);
 858
 859         /*
 860          * With the cluster operational install ihidden.
 861          * (only applicable to pfs mounts, not applicable to spmp)
 862          */
 863         hammer2_inode_install_hidden(pmp);
 864
 865         /*
 866          * Finish setup
 867          */
 868         vfs_getnewfsid(mp);
 869         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
 870         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
 871         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
 872
 873         copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 874         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 875         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
 876         copyinstr(path, mp->mnt_stat.f_mntonname,
 877                   sizeof(mp->mnt_stat.f_mntonname) - 1,
 878                   &size);
 879
 880         /*
 881          * Initial statfs to prime mnt_stat.
 882          */
 883         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
 884
 885         return 0;
 886 }
 887
 888 /*
 889  * Handle bioq for strategy write
 890  */
 891 static
 892 void
 893 hammer2_write_thread(void *arg)
 894 {
 895         hammer2_pfsmount_t *pmp;
 896         struct bio *bio;
 897         struct buf *bp;
 898         hammer2_trans_t trans;
 899         struct vnode *vp;
 900         hammer2_inode_t *ip;
 901         hammer2_cluster_t *cparent;
 902         hammer2_inode_data_t *wipdata;
 903         hammer2_key_t lbase;
 904         int lblksize;
 905         int pblksize;
 906         int error;
 907
 908         pmp = arg;
 909
 910         mtx_lock(&pmp->wthread_mtx);
 911         while (pmp->wthread_destroy == 0) {
 912                 if (bioq_first(&pmp->wthread_bioq) == NULL) {
 913                         mtxsleep(&pmp->wthread_bioq, &pmp->wthread_mtx,
 914                                  0, "h2bioqw", 0);
 915                 }
 916                 cparent = NULL;
 917
 918                 hammer2_trans_init(&trans, pmp, HAMMER2_TRANS_BUFCACHE);
 919
 920                 while ((bio = bioq_takefirst(&pmp->wthread_bioq)) != NULL) {
 921                         /*
 922                          * dummy bio for synchronization.  The transaction
 923                          * must be reinitialized.
 924                          */
 925                         if (bio->bio_buf == NULL) {
 926                                 bio->bio_flags |= BIO_DONE;
 927                                 wakeup(bio);
 928                                 hammer2_trans_done(&trans);
 929                                 hammer2_trans_init(&trans, pmp,
 930                                                    HAMMER2_TRANS_BUFCACHE);
 931                                 continue;
 932                         }
 933
 934                         /*
 935                          * else normal bio processing
 936                          */
 937                         mtx_unlock(&pmp->wthread_mtx);
 938
 939                         hammer2_lwinprog_drop(pmp);
 940
 941                         error = 0;
 942                         bp = bio->bio_buf;
 943                         vp = bp->b_vp;
 944                         ip = VTOI(vp);
 945
 946                         /*
 947                          * Inode is modified, flush size and mtime changes
 948                          * to ensure that the file size remains consistent
 949                          * with the buffers being flushed.
 950                          *
 951                          * NOTE: The inode_fsync() call only flushes the
 952                          *       inode's meta-data state, it doesn't try
 953                          *       to flush underlying buffers or chains.
 954                          */
 955                         cparent = hammer2_inode_lock_ex(ip);
 956                         if (ip->flags & (HAMMER2_INODE_RESIZED |
 957                                          HAMMER2_INODE_MTIME)) {
 958                                 hammer2_inode_fsync(&trans, ip, cparent);
 959                         }
 960                         wipdata = hammer2_cluster_modify_ip(&trans, ip,
 961                                                          cparent, 0);
 962                         lblksize = hammer2_calc_logical(ip, bio->bio_offset,
 963                                                         &lbase, NULL);
 964                         pblksize = hammer2_calc_physical(ip, wipdata, lbase);
 965                         hammer2_write_file_core(bp, &trans, ip, wipdata,
 966                                                 cparent,
 967                                                 lbase, IO_ASYNC,
 968                                                 pblksize, &error);
 969                         hammer2_cluster_modsync(cparent);
 970                         hammer2_inode_unlock_ex(ip, cparent);
 971                         if (error) {
 972                                 kprintf("hammer2: error in buffer write\n");
 973                                 bp->b_flags |= B_ERROR;
 974                                 bp->b_error = EIO;
 975                         }
 976                         biodone(bio);
 977                         mtx_lock(&pmp->wthread_mtx);
 978                 }
 979                 hammer2_trans_done(&trans);
 980         }
 981         pmp->wthread_destroy = -1;
 982         wakeup(&pmp->wthread_destroy);
 983
 984         mtx_unlock(&pmp->wthread_mtx);
 985 }
 986
 987 void
 988 hammer2_bioq_sync(hammer2_pfsmount_t *pmp)
 989 {
 990         struct bio sync_bio;
 991
 992         bzero(&sync_bio, sizeof(sync_bio));     /* dummy with no bio_buf */
 993         mtx_lock(&pmp->wthread_mtx);
 994         if (pmp->wthread_destroy == 0 &&
 995             TAILQ_FIRST(&pmp->wthread_bioq.queue)) {
 996                 bioq_insert_tail(&pmp->wthread_bioq, &sync_bio);
 997                 while ((sync_bio.bio_flags & BIO_DONE) == 0)
 998                         mtxsleep(&sync_bio, &pmp->wthread_mtx, 0, "h2bioq", 0);
 999         }
1000         mtx_unlock(&pmp->wthread_mtx);
1001 }
1002
1003 /*
1004  * Return a chain suitable for I/O, creating the chain if necessary
1005  * and assigning its physical block.
1006  */
1007 static
1008 hammer2_cluster_t *
1009 hammer2_assign_physical(hammer2_trans_t *trans,
1010                         hammer2_inode_t *ip, hammer2_cluster_t *cparent,
1011                         hammer2_key_t lbase, int pblksize, int *errorp)
1012 {
1013         hammer2_cluster_t *cluster;
1014         hammer2_cluster_t *dparent;
1015         hammer2_key_t key_dummy;
1016         int pradix = hammer2_getradix(pblksize);
1017         int ddflag;
1018
1019         /*
1020          * Locate the chain associated with lbase, return a locked chain.
1021          * However, do not instantiate any data reference (which utilizes a
1022          * device buffer) because we will be using direct IO via the
1023          * logical buffer cache buffer.
1024          */
1025         *errorp = 0;
1026         KKASSERT(pblksize >= HAMMER2_ALLOC_MIN);
1027 retry:
1028         dparent = hammer2_cluster_lookup_init(cparent, 0);
1029         cluster = hammer2_cluster_lookup(dparent, &key_dummy,
1030                                      lbase, lbase,
1031                                      HAMMER2_LOOKUP_NODATA, &ddflag);
1032
1033         if (cluster == NULL) {
1034                 /*
1035                  * We found a hole, create a new chain entry.
1036                  *
1037                  * NOTE: DATA chains are created without device backing
1038                  *       store (nor do we want any).
1039                  */
1040                 *errorp = hammer2_cluster_create(trans, dparent, &cluster,
1041                                                lbase, HAMMER2_PBUFRADIX,
1042                                                HAMMER2_BREF_TYPE_DATA,
1043                                                pblksize);
1044                 if (cluster == NULL) {
1045                         hammer2_cluster_lookup_done(dparent);
1046                         panic("hammer2_cluster_create: par=%p error=%d\n",
1047                                 dparent->focus, *errorp);
1048                         goto retry;
1049                 }
1050                 /*ip->delta_dcount += pblksize;*/
1051         } else {
1052                 switch (hammer2_cluster_type(cluster)) {
1053                 case HAMMER2_BREF_TYPE_INODE:
1054                         /*
1055                          * The data is embedded in the inode.  The
1056                          * caller is responsible for marking the inode
1057                          * modified and copying the data to the embedded
1058                          * area.
1059                          */
1060                         break;
1061                 case HAMMER2_BREF_TYPE_DATA:
1062                         if (hammer2_cluster_bytes(cluster) != pblksize) {
1063                                 hammer2_cluster_resize(trans, ip,
1064                                                      dparent, cluster,
1065                                                      pradix,
1066                                                      HAMMER2_MODIFY_OPTDATA);
1067                         }
1068                         hammer2_cluster_modify(trans, cluster,
1069                                              HAMMER2_MODIFY_OPTDATA);
1070                         break;
1071                 default:
1072                         panic("hammer2_assign_physical: bad type");
1073                         /* NOT REACHED */
1074                         break;
1075                 }
1076         }
1077
1078         /*
1079          * Cleanup.  If cluster wound up being the inode itself, i.e.
1080          * the DIRECTDATA case for offset 0, then we need to update cparent.
1081          * The caller expects cparent to not become stale.
1082          */
1083         hammer2_cluster_lookup_done(dparent);
1084         /* dparent = NULL; safety */
1085         if (cluster && ddflag)
1086                 hammer2_cluster_replace_locked(cparent, cluster);
1087         return (cluster);
1088 }
1089
1090 /*
1091  * From hammer2_vnops.c.
1092  * The core write function which determines which path to take
1093  * depending on compression settings.
1094  */
1095 static
1096 void
1097 hammer2_write_file_core(struct buf *bp, hammer2_trans_t *trans,
1098                         hammer2_inode_t *ip, hammer2_inode_data_t *ipdata,
1099                         hammer2_cluster_t *cparent,
1100                         hammer2_key_t lbase, int ioflag, int pblksize,
1101                         int *errorp)
1102 {
1103         hammer2_cluster_t *cluster;
1104
1105         switch(HAMMER2_DEC_COMP(ipdata->comp_algo)) {
1106         case HAMMER2_COMP_NONE:
1107                 /*
1108                  * We have to assign physical storage to the buffer
1109                  * we intend to dirty or write now to avoid deadlocks
1110                  * in the strategy code later.
1111                  *
1112                  * This can return NOOFFSET for inode-embedded data.
1113                  * The strategy code will take care of it in that case.
1114                  */
1115                 cluster = hammer2_assign_physical(trans, ip, cparent,
1116                                                 lbase, pblksize,
1117                                                 errorp);
1118                 hammer2_write_bp(cluster, bp, ioflag, pblksize, errorp);
1119                 if (cluster)
1120                         hammer2_cluster_unlock(cluster);
1121                 break;
1122         case HAMMER2_COMP_AUTOZERO:
1123                 /*
1124                  * Check for zero-fill only
1125                  */
1126                 hammer2_zero_check_and_write(bp, trans, ip,
1127                                     ipdata, cparent, lbase,
1128                                     ioflag, pblksize, errorp);
1129                 break;
1130         case HAMMER2_COMP_LZ4:
1131         case HAMMER2_COMP_ZLIB:
1132         default:
1133                 /*
1134                  * Check for zero-fill and attempt compression.
1135                  */
1136                 hammer2_compress_and_write(bp, trans, ip,
1137                                            ipdata, cparent,
1138                                            lbase, ioflag,
1139                                            pblksize, errorp,
1140                                            ipdata->comp_algo);
1141                 break;
1142         }
1143 }
1144
1145 /*
1146  * Generic function that will perform the compression in compression
1147  * write path. The compression algorithm is determined by the settings
1148  * obtained from inode.
1149  */
1150 static
1151 void
1152 hammer2_compress_and_write(struct buf *bp, hammer2_trans_t *trans,
1153         hammer2_inode_t *ip, const hammer2_inode_data_t *ipdata,
1154         hammer2_cluster_t *cparent,
1155         hammer2_key_t lbase, int ioflag, int pblksize,
1156         int *errorp, int comp_algo)
1157 {
1158         hammer2_cluster_t *cluster;
1159         hammer2_chain_t *chain;
1160         int comp_size;
1161         int comp_block_size;
1162         int i;
1163         char *comp_buffer;
1164
1165         if (test_block_zeros(bp->b_data, pblksize)) {
1166                 zero_write(bp, trans, ip, ipdata, cparent, lbase, errorp);
1167                 return;
1168         }
1169
1170         comp_size = 0;
1171         comp_buffer = NULL;
1172
1173         KKASSERT(pblksize / 2 <= 32768);
1174
1175         if (ip->comp_heuristic < 8 || (ip->comp_heuristic & 7) == 0) {
1176                 z_stream strm_compress;
1177                 int comp_level;
1178                 int ret;
1179
1180                 switch(HAMMER2_DEC_COMP(comp_algo)) {
1181                 case HAMMER2_COMP_LZ4:
1182                         comp_buffer = objcache_get(cache_buffer_write,
1183                                                    M_INTWAIT);
1184                         comp_size = LZ4_compress_limitedOutput(
1185                                         bp->b_data,
1186                                         &comp_buffer[sizeof(int)],
1187                                         pblksize,
1188                                         pblksize / 2 - sizeof(int));
1189                         /*
1190                          * We need to prefix with the size, LZ4
1191                          * doesn't do it for us.  Add the related
1192                          * overhead.
1193                          */
1194                         *(int *)comp_buffer = comp_size;
1195                         if (comp_size)
1196                                 comp_size += sizeof(int);
1197                         break;
1198                 case HAMMER2_COMP_ZLIB:
1199                         comp_level = HAMMER2_DEC_LEVEL(comp_algo);
1200                         if (comp_level == 0)
1201                                 comp_level = 6; /* default zlib compression */
1202                         else if (comp_level < 6)
1203                                 comp_level = 6;
1204                         else if (comp_level > 9)
1205                                 comp_level = 9;
1206                         ret = deflateInit(&strm_compress, comp_level);
1207                         if (ret != Z_OK) {
1208                                 kprintf("HAMMER2 ZLIB: fatal error "
1209                                         "on deflateInit.\n");
1210                         }
1211
1212                         comp_buffer = objcache_get(cache_buffer_write,
1213                                                    M_INTWAIT);
1214                         strm_compress.next_in = bp->b_data;
1215                         strm_compress.avail_in = pblksize;
1216                         strm_compress.next_out = comp_buffer;
1217                         strm_compress.avail_out = pblksize / 2;
1218                         ret = deflate(&strm_compress, Z_FINISH);
1219                         if (ret == Z_STREAM_END) {
1220                                 comp_size = pblksize / 2 -
1221                                             strm_compress.avail_out;
1222                         } else {
1223                                 comp_size = 0;
1224                         }
1225                         ret = deflateEnd(&strm_compress);
1226                         break;
1227                 default:
1228                         kprintf("Error: Unknown compression method.\n");
1229                         kprintf("Comp_method = %d.\n", comp_algo);
1230                         break;
1231                 }
1232         }
1233
1234         if (comp_size == 0) {
1235                 /*
1236                  * compression failed or turned off
1237                  */
1238                 comp_block_size = pblksize;     /* safety */
1239                 if (++ip->comp_heuristic > 128)
1240                         ip->comp_heuristic = 8;
1241         } else {
1242                 /*
1243                  * compression succeeded
1244                  */
1245                 ip->comp_heuristic = 0;
1246                 if (comp_size <= 1024) {
1247                         comp_block_size = 1024;
1248                 } else if (comp_size <= 2048) {
1249                         comp_block_size = 2048;
1250                 } else if (comp_size <= 4096) {
1251                         comp_block_size = 4096;
1252                 } else if (comp_size <= 8192) {
1253                         comp_block_size = 8192;
1254                 } else if (comp_size <= 16384) {
1255                         comp_block_size = 16384;
1256                 } else if (comp_size <= 32768) {
1257                         comp_block_size = 32768;
1258                 } else {
1259                         panic("hammer2: WRITE PATH: "
1260                               "Weird comp_size value.");
1261                         /* NOT REACHED */
1262                         comp_block_size = pblksize;
1263                 }
1264         }
1265
1266         cluster = hammer2_assign_physical(trans, ip, cparent,
1267                                           lbase, comp_block_size,
1268                                           errorp);
1269         ipdata = &hammer2_cluster_data(cparent)->ipdata;
1270
1271         if (*errorp) {
1272                 kprintf("WRITE PATH: An error occurred while "
1273                         "assigning physical space.\n");
1274                 KKASSERT(cluster == NULL);
1275                 goto done;
1276         }
1277
1278         for (i = 0; i < cluster->nchains; ++i) {
1279                 hammer2_io_t *dio;
1280                 char *bdata;
1281                 int temp_check;
1282
1283                 chain = cluster->array[i];
1284                 KKASSERT(chain->flags & HAMMER2_CHAIN_MODIFIED);
1285
1286                 switch(chain->bref.type) {
1287                 case HAMMER2_BREF_TYPE_INODE:
1288                         KKASSERT(chain->data->ipdata.op_flags &
1289                                  HAMMER2_OPFLAG_DIRECTDATA);
1290                         KKASSERT(bp->b_loffset == 0);
1291                         bcopy(bp->b_data, chain->data->ipdata.u.data,
1292                               HAMMER2_EMBEDDED_BYTES);
1293                         break;
1294                 case HAMMER2_BREF_TYPE_DATA:
1295                         temp_check = HAMMER2_DEC_CHECK(chain->bref.methods);
1296
1297                         /*
1298                          * Optimize out the read-before-write
1299                          * if possible.
1300                          */
1301                         *errorp = hammer2_io_newnz(chain->hmp,
1302                                                    chain->bref.data_off,
1303                                                    chain->bytes,
1304                                                    &dio);
1305                         if (*errorp) {
1306                                 hammer2_io_brelse(&dio);
1307                                 kprintf("hammer2: WRITE PATH: "
1308                                         "dbp bread error\n");
1309                                 break;
1310                         }
1311                         bdata = hammer2_io_data(dio, chain->bref.data_off);
1312
1313                         /*
1314                          * When loading the block make sure we don't
1315                          * leave garbage after the compressed data.
1316                          */
1317                         if (comp_size) {
1318                                 chain->bref.methods =
1319                                         HAMMER2_ENC_COMP(comp_algo) +
1320                                         HAMMER2_ENC_CHECK(temp_check);
1321                                 bcopy(comp_buffer, bdata, comp_size);
1322                                 if (comp_size != comp_block_size) {
1323                                         bzero(bdata + comp_size,
1324                                               comp_block_size - comp_size);
1325                                 }
1326                         } else {
1327                                 chain->bref.methods =
1328                                         HAMMER2_ENC_COMP(
1329                                                 HAMMER2_COMP_NONE) +
1330                                         HAMMER2_ENC_CHECK(temp_check);
1331                                 bcopy(bp->b_data, bdata, pblksize);
1332                         }
1333
1334                         /*
1335                          * Device buffer is now valid, chain is no
1336                          * longer in the initial state.
1337                          */
1338                         atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL);
1339
1340                         /* Now write the related bdp. */
1341                         if (ioflag & IO_SYNC) {
1342                                 /*
1343                                  * Synchronous I/O requested.
1344                                  */
1345                                 hammer2_io_bwrite(&dio);
1346                         /*
1347                         } else if ((ioflag & IO_DIRECT) &&
1348                                    loff + n == pblksize) {
1349                                 hammer2_io_bdwrite(&dio);
1350                         */
1351                         } else if (ioflag & IO_ASYNC) {
1352                                 hammer2_io_bawrite(&dio);
1353                         } else {
1354                                 hammer2_io_bdwrite(&dio);
1355                         }
1356                         break;
1357                 default:
1358                         panic("hammer2_write_bp: bad chain type %d\n",
1359                                 chain->bref.type);
1360                         /* NOT REACHED */
1361                         break;
1362                 }
1363         }
1364 done:
1365         if (cluster)
1366                 hammer2_cluster_unlock(cluster);
1367         if (comp_buffer)
1368                 objcache_put(cache_buffer_write, comp_buffer);
1369 }
1370
1371 /*
1372  * Function that performs zero-checking and writing without compression,
1373  * it corresponds to default zero-checking path.
1374  */
1375 static
1376 void
1377 hammer2_zero_check_and_write(struct buf *bp, hammer2_trans_t *trans,
1378         hammer2_inode_t *ip, const hammer2_inode_data_t *ipdata,
1379         hammer2_cluster_t *cparent,
1380         hammer2_key_t lbase, int ioflag, int pblksize, int *errorp)
1381 {
1382         hammer2_cluster_t *cluster;
1383
1384         if (test_block_zeros(bp->b_data, pblksize)) {
1385                 zero_write(bp, trans, ip, ipdata, cparent, lbase, errorp);
1386         } else {
1387                 cluster = hammer2_assign_physical(trans, ip, cparent,
1388                                                   lbase, pblksize, errorp);
1389                 hammer2_write_bp(cluster, bp, ioflag, pblksize, errorp);
1390                 if (cluster)
1391                         hammer2_cluster_unlock(cluster);
1392         }
1393 }
1394
1395 /*
1396  * A function to test whether a block of data contains only zeros,
1397  * returns TRUE (non-zero) if the block is all zeros.
1398  */
1399 static
1400 int
1401 test_block_zeros(const char *buf, size_t bytes)
1402 {
1403         size_t i;
1404
1405         for (i = 0; i < bytes; i += sizeof(long)) {
1406                 if (*(const long *)(buf + i) != 0)
1407                         return (0);
1408         }
1409         return (1);
1410 }
1411
1412 /*
1413  * Function to "write" a block that contains only zeros.
1414  */
1415 static
1416 void
1417 zero_write(struct buf *bp, hammer2_trans_t *trans,
1418         hammer2_inode_t *ip, const hammer2_inode_data_t *ipdata,
1419         hammer2_cluster_t *cparent,
1420         hammer2_key_t lbase, int *errorp __unused)
1421 {
1422         hammer2_cluster_t *cluster;
1423         hammer2_media_data_t *data;
1424         hammer2_key_t key_dummy;
1425         int ddflag;
1426
1427         cparent = hammer2_cluster_lookup_init(cparent, 0);
1428         cluster = hammer2_cluster_lookup(cparent, &key_dummy, lbase, lbase,
1429                                      HAMMER2_LOOKUP_NODATA, &ddflag);
1430         if (cluster) {
1431                 data = hammer2_cluster_wdata(cluster);
1432
1433                 if (ddflag) {
1434                         KKASSERT(cluster->focus->flags &
1435                                  HAMMER2_CHAIN_MODIFIED);
1436                         bzero(data->ipdata.u.data, HAMMER2_EMBEDDED_BYTES);
1437                         hammer2_cluster_modsync(cluster);
1438                 } else {
1439                         hammer2_cluster_delete(trans, cluster, 0);
1440                 }
1441                 hammer2_cluster_unlock(cluster);
1442         }
1443         hammer2_cluster_lookup_done(cparent);
1444 }
1445
1446 /*
1447  * Function to write the data as it is, without performing any sort of
1448  * compression. This function is used in path without compression and
1449  * default zero-checking path.
1450  */
1451 static
1452 void
1453 hammer2_write_bp(hammer2_cluster_t *cluster, struct buf *bp, int ioflag,
1454                                 int pblksize, int *errorp)
1455 {
1456         hammer2_chain_t *chain;
1457         hammer2_io_t *dio;
1458         char *bdata;
1459         int error;
1460         int i;
1461         int temp_check;
1462
1463         error = 0;      /* XXX TODO below */
1464
1465         for (i = 0; i < cluster->nchains; ++i) {
1466                 chain = cluster->array[i];
1467
1468                 temp_check = HAMMER2_DEC_CHECK(chain->bref.methods);
1469
1470                 KKASSERT(chain->flags & HAMMER2_CHAIN_MODIFIED);
1471
1472                 switch(chain->bref.type) {
1473                 case HAMMER2_BREF_TYPE_INODE:
1474                         KKASSERT(chain->data->ipdata.op_flags &
1475                                  HAMMER2_OPFLAG_DIRECTDATA);
1476                         KKASSERT(bp->b_loffset == 0);
1477                         bcopy(bp->b_data, chain->data->ipdata.u.data,
1478                               HAMMER2_EMBEDDED_BYTES);
1479                         error = 0;
1480                         break;
1481                 case HAMMER2_BREF_TYPE_DATA:
1482                         error = hammer2_io_newnz(chain->hmp,
1483                                                  chain->bref.data_off,
1484                                                  chain->bytes, &dio);
1485                         if (error) {
1486                                 hammer2_io_bqrelse(&dio);
1487                                 kprintf("hammer2: WRITE PATH: "
1488                                         "dbp bread error\n");
1489                                 break;
1490                         }
1491                         bdata = hammer2_io_data(dio, chain->bref.data_off);
1492
1493                         chain->bref.methods = HAMMER2_ENC_COMP(
1494                                                         HAMMER2_COMP_NONE) +
1495                                               HAMMER2_ENC_CHECK(temp_check);
1496                         bcopy(bp->b_data, bdata, chain->bytes);
1497
1498                         /*
1499                          * Device buffer is now valid, chain is no
1500                          * longer in the initial state.
1501                          */
1502                         atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL);
1503
1504                         if (ioflag & IO_SYNC) {
1505                                 /*
1506                                  * Synchronous I/O requested.
1507                                  */
1508                                 hammer2_io_bwrite(&dio);
1509                         /*
1510                         } else if ((ioflag & IO_DIRECT) &&
1511                                    loff + n == pblksize) {
1512                                 hammer2_io_bdwrite(&dio);
1513                         */
1514                         } else if (ioflag & IO_ASYNC) {
1515                                 hammer2_io_bawrite(&dio);
1516                         } else {
1517                                 hammer2_io_bdwrite(&dio);
1518                         }
1519                         break;
1520                 default:
1521                         panic("hammer2_write_bp: bad chain type %d\n",
1522                               chain->bref.type);
1523                         /* NOT REACHED */
1524                         error = 0;
1525                         break;
1526                 }
1527                 KKASSERT(error == 0);   /* XXX TODO */
1528         }
1529         *errorp = error;
1530 }
1531
1532 static
1533 int
1534 hammer2_remount(hammer2_mount_t *hmp, struct mount *mp, char *path,
1535                 struct vnode *devvp, struct ucred *cred)
1536 {
1537         int error;
1538
1539         if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
1540                 error = hammer2_recovery(hmp);
1541         } else {
1542                 error = 0;
1543         }
1544         return error;
1545 }
1546
1547 static
1548 int
1549 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1550 {
1551         hammer2_pfsmount_t *pmp;
1552         hammer2_mount_t *hmp;
1553         hammer2_chain_t *rchain;
1554         hammer2_cluster_t *cluster;
1555         int flags;
1556         int error = 0;
1557         int i;
1558
1559         pmp = MPTOPMP(mp);
1560
1561         if (pmp == NULL)
1562                 return(0);
1563
1564         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1565         TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry);
1566
1567         /*
1568          * If mount initialization proceeded far enough we must flush
1569          * its vnodes.
1570          */
1571         if (mntflags & MNT_FORCE)
1572                 flags = FORCECLOSE;
1573         else
1574                 flags = 0;
1575         if (pmp->iroot) {
1576                 error = vflush(mp, 0, flags);
1577                 if (error)
1578                         goto failed;
1579         }
1580
1581         ccms_domain_uninit(&pmp->ccms_dom);
1582
1583         if (pmp->wthread_td) {
1584                 mtx_lock(&pmp->wthread_mtx);
1585                 pmp->wthread_destroy = 1;
1586                 wakeup(&pmp->wthread_bioq);
1587                 while (pmp->wthread_destroy != -1) {
1588                         mtxsleep(&pmp->wthread_destroy,
1589                                 &pmp->wthread_mtx, 0,
1590                                 "umount-sleep", 0);
1591                 }
1592                 mtx_unlock(&pmp->wthread_mtx);
1593                 pmp->wthread_td = NULL;
1594         }
1595
1596         /*
1597          * Cleanup our reference on ihidden.
1598          */
1599         if (pmp->ihidden) {
1600                 hammer2_inode_drop(pmp->ihidden);
1601                 pmp->ihidden = NULL;
1602         }
1603
1604         /*
1605          * Cleanup our reference on iroot.  iroot is (should) not be needed
1606          * by the flush code.
1607          */
1608         if (pmp->iroot) {
1609                 cluster = &pmp->iroot->cluster;
1610                 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1611                         rchain = pmp->iroot->cluster.array[i];
1612                         if (rchain == NULL)
1613                                 continue;
1614                         hmp = rchain->hmp;
1615                         hammer2_vfs_unmount_hmp1(mp, hmp);
1616
1617                         atomic_clear_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
1618 #if REPORT_REFS_ERRORS
1619                         if (rchain->refs != 1)
1620                                 kprintf("PMP->RCHAIN %p REFS WRONG %d\n",
1621                                         rchain, rchain->refs);
1622 #else
1623                         KKASSERT(rchain->refs == 1);
1624 #endif
1625                         hammer2_chain_drop(rchain);
1626                         cluster->array[i] = NULL;
1627                         hammer2_vfs_unmount_hmp2(mp, hmp);
1628                 }
1629                 cluster->focus = NULL;
1630
1631 #if REPORT_REFS_ERRORS
1632                 if (pmp->iroot->refs != 1)
1633                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
1634                                 pmp->iroot, pmp->iroot->refs);
1635 #else
1636                 KKASSERT(pmp->iroot->refs == 1);
1637 #endif
1638                 /* ref for pmp->iroot */
1639                 hammer2_inode_drop(pmp->iroot);
1640                 pmp->iroot = NULL;
1641         }
1642
1643         pmp->mp = NULL;
1644         mp->mnt_data = NULL;
1645
1646         kmalloc_destroy(&pmp->mmsg);
1647         kmalloc_destroy(&pmp->minode);
1648
1649         kfree(pmp, M_HAMMER2);
1650         error = 0;
1651
1652 failed:
1653         lockmgr(&hammer2_mntlk, LK_RELEASE);
1654
1655         return (error);
1656 }
1657
1658 static
1659 void
1660 hammer2_vfs_unmount_hmp1(struct mount *mp, hammer2_mount_t *hmp)
1661 {
1662         hammer2_mount_exlock(hmp);
1663         --hmp->pmp_count;
1664
1665         kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
1666
1667         kdmsg_iocom_uninit(&hmp->iocom);        /* XXX chain depend deadlck? */
1668
1669         /*
1670          * Flush any left over chains.  The voldata lock is only used
1671          * to synchronize against HAMMER2_CHAIN_MODIFIED_AUX.
1672          *
1673          * Flush twice to ensure that the freemap is completely
1674          * synchronized.  If we only do it once the next mount's
1675          * recovery scan will have to do some fixups (which isn't
1676          * bad, but we don't want it to have to do it except when
1677          * recovering from a crash).
1678          */
1679         hammer2_voldata_lock(hmp);
1680         if (((hmp->vchain.flags | hmp->fchain.flags) &
1681              HAMMER2_CHAIN_MODIFIED) ||
1682             hmp->vchain.update_xhi > hmp->vchain.update_xlo ||
1683             hmp->fchain.update_xhi > hmp->fchain.update_xlo) {
1684                 hammer2_voldata_unlock(hmp);
1685                 hammer2_vfs_sync(mp, MNT_WAIT);
1686                 /*hammer2_vfs_sync(mp, MNT_WAIT);*/
1687         } else {
1688                 hammer2_voldata_unlock(hmp);
1689         }
1690         if (hmp->pmp_count == 0) {
1691                 if (((hmp->vchain.flags | hmp->fchain.flags) &
1692                      HAMMER2_CHAIN_MODIFIED) ||
1693                     hmp->vchain.update_xhi > hmp->vchain.update_xlo ||
1694                     hmp->fchain.update_xhi > hmp->fchain.update_xlo) {
1695                         kprintf("hammer2_unmount: chains left over "
1696                                 "after final sync\n");
1697                         kprintf("    vchain %08x update_xlo/hi %08x/%08x\n",
1698                                 hmp->vchain.flags,
1699                                 hmp->vchain.update_xlo,
1700                                 hmp->vchain.update_xhi);
1701                         kprintf("    fchain %08x update_xhi/hi %08x/%08x\n",
1702                                 hmp->fchain.flags,
1703                                 hmp->fchain.update_xlo,
1704                                 hmp->fchain.update_xhi);
1705
1706                         if (hammer2_debug & 0x0010)
1707                                 Debugger("entered debugger");
1708                 }
1709         }
1710 }
1711
1712 static
1713 void
1714 hammer2_vfs_unmount_hmp2(struct mount *mp, hammer2_mount_t *hmp)
1715 {
1716         hammer2_pfsmount_t *spmp;
1717         struct vnode *devvp;
1718         int dumpcnt;
1719         int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
1720
1721         /*
1722          * If no PFS's left drop the master hammer2_mount for the
1723          * device.
1724          */
1725         if (hmp->pmp_count == 0) {
1726                 /*
1727                  * Clean up SPMP and the super-root inode
1728                  */
1729                 spmp = hmp->spmp;
1730                 if (spmp) {
1731                         if (spmp->iroot) {
1732                                 hammer2_inode_drop(spmp->iroot);
1733                                 spmp->iroot = NULL;
1734                         }
1735                         hmp->spmp = NULL;
1736                         kmalloc_destroy(&spmp->mmsg);
1737                         kmalloc_destroy(&spmp->minode);
1738                         kfree(spmp, M_HAMMER2);
1739                 }
1740
1741                 /*
1742                  * Finish up with the device vnode
1743                  */
1744                 if ((devvp = hmp->devvp) != NULL) {
1745                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1746                         vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1747                         hmp->devvp = NULL;
1748                         VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL);
1749                         vn_unlock(devvp);
1750                         vrele(devvp);
1751                         devvp = NULL;
1752                 }
1753
1754                 /*
1755                  * Clear vchain/fchain flags that might prevent final cleanup
1756                  * of these chains.
1757                  */
1758                 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) {
1759                         atomic_clear_int(&hmp->vchain.flags,
1760                                          HAMMER2_CHAIN_MODIFIED);
1761                         hammer2_chain_drop(&hmp->vchain);
1762                 }
1763                 if (hmp->vchain.flags & HAMMER2_CHAIN_FLUSH_CREATE) {
1764                         atomic_clear_int(&hmp->vchain.flags,
1765                                          HAMMER2_CHAIN_FLUSH_CREATE);
1766                         hammer2_chain_drop(&hmp->vchain);
1767                 }
1768                 if (hmp->vchain.flags & HAMMER2_CHAIN_FLUSH_DELETE) {
1769                         atomic_clear_int(&hmp->vchain.flags,
1770                                          HAMMER2_CHAIN_FLUSH_DELETE);
1771                         hammer2_chain_drop(&hmp->vchain);
1772                 }
1773
1774                 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) {
1775                         atomic_clear_int(&hmp->fchain.flags,
1776                                          HAMMER2_CHAIN_MODIFIED);
1777                         hammer2_chain_drop(&hmp->fchain);
1778                 }
1779                 if (hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_CREATE) {
1780                         atomic_clear_int(&hmp->fchain.flags,
1781                                          HAMMER2_CHAIN_FLUSH_CREATE);
1782                         hammer2_chain_drop(&hmp->fchain);
1783                 }
1784                 if (hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_DELETE) {
1785                         atomic_clear_int(&hmp->fchain.flags,
1786                                          HAMMER2_CHAIN_FLUSH_DELETE);
1787                         hammer2_chain_drop(&hmp->fchain);
1788                 }
1789
1790                 /*
1791                  * Final drop of embedded freemap root chain to
1792                  * clean up fchain.core (fchain structure is not
1793                  * flagged ALLOCATED so it is cleaned out and then
1794                  * left to rot).
1795                  */
1796                 hammer2_chain_drop(&hmp->fchain);
1797
1798                 /*
1799                  * Final drop of embedded volume root chain to clean
1800                  * up vchain.core (vchain structure is not flagged
1801                  * ALLOCATED so it is cleaned out and then left to
1802                  * rot).
1803                  */
1804                 dumpcnt = 50;
1805                 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v');
1806                 dumpcnt = 50;
1807                 hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f');
1808                 hammer2_mount_unlock(hmp);
1809                 hammer2_chain_drop(&hmp->vchain);
1810
1811                 hammer2_io_cleanup(hmp, &hmp->iotree);
1812                 if (hmp->iofree_count) {
1813                         kprintf("io_cleanup: %d I/O's left hanging\n",
1814                                 hmp->iofree_count);
1815                 }
1816
1817                 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1818                 kmalloc_destroy(&hmp->mchain);
1819                 kfree(hmp, M_HAMMER2);
1820         } else {
1821                 hammer2_mount_unlock(hmp);
1822         }
1823 }
1824
1825 static
1826 int
1827 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1828              ino_t ino, struct vnode **vpp)
1829 {
1830         kprintf("hammer2_vget\n");
1831         return (EOPNOTSUPP);
1832 }
1833
1834 static
1835 int
1836 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1837 {
1838         hammer2_pfsmount_t *pmp;
1839         hammer2_cluster_t *cparent;
1840         int error;
1841         struct vnode *vp;
1842
1843         pmp = MPTOPMP(mp);
1844         if (pmp->iroot == NULL) {
1845                 *vpp = NULL;
1846                 error = EINVAL;
1847         } else {
1848                 cparent = hammer2_inode_lock_sh(pmp->iroot);
1849                 vp = hammer2_igetv(pmp->iroot, cparent, &error);
1850                 hammer2_inode_unlock_sh(pmp->iroot, cparent);
1851                 *vpp = vp;
1852                 if (vp == NULL)
1853                         kprintf("vnodefail\n");
1854         }
1855
1856         return (error);
1857 }
1858
1859 /*
1860  * Filesystem status
1861  *
1862  * XXX incorporate ipdata->inode_quota and data_quota
1863  */
1864 static
1865 int
1866 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1867 {
1868         hammer2_pfsmount_t *pmp;
1869         hammer2_mount_t *hmp;
1870
1871         pmp = MPTOPMP(mp);
1872         KKASSERT(pmp->iroot->cluster.nchains >= 1);
1873         hmp = pmp->iroot->cluster.focus->hmp;   /* XXX */
1874
1875         mp->mnt_stat.f_files = pmp->inode_count;
1876         mp->mnt_stat.f_ffree = 0;
1877         mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
1878         mp->mnt_stat.f_bfree =  hmp->voldata.allocator_free / HAMMER2_PBUFSIZE;
1879         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1880
1881         *sbp = mp->mnt_stat;
1882         return (0);
1883 }
1884
1885 static
1886 int
1887 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1888 {
1889         hammer2_pfsmount_t *pmp;
1890         hammer2_mount_t *hmp;
1891
1892         pmp = MPTOPMP(mp);
1893         KKASSERT(pmp->iroot->cluster.nchains >= 1);
1894         hmp = pmp->iroot->cluster.focus->hmp;   /* XXX */
1895
1896         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1897         mp->mnt_vstat.f_files = pmp->inode_count;
1898         mp->mnt_vstat.f_ffree = 0;
1899         mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
1900         mp->mnt_vstat.f_bfree =  hmp->voldata.allocator_free / HAMMER2_PBUFSIZE;
1901         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1902
1903         *sbp = mp->mnt_vstat;
1904         return (0);
1905 }
1906
1907 /*
1908  * Mount-time recovery (RW mounts)
1909  *
1910  * Updates to the free block table are allowed to lag flushes by one
1911  * transaction.  In case of a crash, then on a fresh mount we must do an
1912  * incremental scan of the last committed transaction id and make sure that
1913  * all related blocks have been marked allocated.
1914  *
1915  * The super-root topology and each PFS has its own transaction id domain,
1916  * so we must track PFS boundary transitions.
1917  */
1918 struct hammer2_recovery_elm {
1919         TAILQ_ENTRY(hammer2_recovery_elm) entry;
1920         hammer2_chain_t *chain;
1921         hammer2_tid_t sync_tid;
1922 };
1923
1924 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm);
1925
1926 struct hammer2_recovery_info {
1927         struct hammer2_recovery_list list;
1928         int     depth;
1929 };
1930
1931 static int hammer2_recovery_scan(hammer2_trans_t *trans, hammer2_mount_t *hmp,
1932                         hammer2_chain_t *parent,
1933                         struct hammer2_recovery_info *info,
1934                         hammer2_tid_t sync_tid);
1935
1936 #define HAMMER2_RECOVERY_MAXDEPTH       10
1937
1938 static
1939 int
1940 hammer2_recovery(hammer2_mount_t *hmp)
1941 {
1942         hammer2_trans_t trans;
1943         struct hammer2_recovery_info info;
1944         struct hammer2_recovery_elm *elm;
1945         hammer2_chain_t *parent;
1946         hammer2_tid_t sync_tid;
1947         int error;
1948         int cumulative_error = 0;
1949
1950         hammer2_trans_init(&trans, hmp->spmp, 0);
1951
1952         sync_tid = 0;
1953         TAILQ_INIT(&info.list);
1954         info.depth = 0;
1955         parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1956         cumulative_error = hammer2_recovery_scan(&trans, hmp, parent,
1957                                                  &info, sync_tid);
1958         hammer2_chain_lookup_done(parent);
1959
1960         while ((elm = TAILQ_FIRST(&info.list)) != NULL) {
1961                 TAILQ_REMOVE(&info.list, elm, entry);
1962                 parent = elm->chain;
1963                 sync_tid = elm->sync_tid;
1964                 kfree(elm, M_HAMMER2);
1965
1966                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS |
1967                                            HAMMER2_RESOLVE_NOREF);
1968                 error = hammer2_recovery_scan(&trans, hmp, parent,
1969                                               &info, sync_tid);
1970                 hammer2_chain_unlock(parent);
1971                 if (error)
1972                         cumulative_error = error;
1973         }
1974         hammer2_trans_done(&trans);
1975
1976         return cumulative_error;
1977 }
1978
1979 static
1980 int
1981 hammer2_recovery_scan(hammer2_trans_t *trans, hammer2_mount_t *hmp,
1982                       hammer2_chain_t *parent,
1983                       struct hammer2_recovery_info *info,
1984                       hammer2_tid_t sync_tid)
1985 {
1986         hammer2_chain_t *chain;
1987         int cache_index;
1988         int cumulative_error = 0;
1989         int pfs_boundary = 0;
1990         int error;
1991
1992         /*
1993          * Adjust freemap to ensure that the block(s) are marked allocated.
1994          */
1995         if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) {
1996                 hammer2_freemap_adjust(trans, hmp, &parent->bref,
1997                                        HAMMER2_FREEMAP_DORECOVER);
1998         }
1999
2000         /*
2001          * Check type for recursive scan
2002          */
2003         switch(parent->bref.type) {
2004         case HAMMER2_BREF_TYPE_VOLUME:
2005                 /* data already instantiated */
2006                 break;
2007         case HAMMER2_BREF_TYPE_INODE:
2008                 /*
2009                  * Must instantiate data for DIRECTDATA test and also
2010                  * for recursion.
2011                  */
2012                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2013                 if (parent->data->ipdata.op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
2014                         /* not applicable to recovery scan */
2015                         hammer2_chain_unlock(parent);
2016                         return 0;
2017                 }
2018                 if ((parent->data->ipdata.op_flags & HAMMER2_OPFLAG_PFSROOT) &&
2019                     info->depth != 0) {
2020                         pfs_boundary = 1;
2021                         sync_tid = parent->bref.mirror_tid - 1;
2022                 }
2023                 hammer2_chain_unlock(parent);
2024                 break;
2025         case HAMMER2_BREF_TYPE_INDIRECT:
2026                 /*
2027                  * Must instantiate data for recursion
2028                  */
2029                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2030                 hammer2_chain_unlock(parent);
2031                 break;
2032         case HAMMER2_BREF_TYPE_DATA:
2033         case HAMMER2_BREF_TYPE_FREEMAP:
2034         case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2035         case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
2036                 /* not applicable to recovery scan */
2037                 return 0;
2038                 break;
2039         default:
2040                 return EDOM;
2041         }
2042
2043         /*
2044          * Defer operation if depth limit reached or if we are crossing a
2045          * PFS boundary.
2046          */
2047         if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH || pfs_boundary) {
2048                 struct hammer2_recovery_elm *elm;
2049
2050                 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK);
2051                 elm->chain = parent;
2052                 elm->sync_tid = sync_tid;
2053                 hammer2_chain_ref(parent);
2054                 TAILQ_INSERT_TAIL(&info->list, elm, entry);
2055                 /* unlocked by caller */
2056
2057                 return(0);
2058         }
2059
2060
2061         /*
2062          * Recursive scan of the last flushed transaction only.  We are
2063          * doing this without pmp assignments so don't leave the chains
2064          * hanging around after we are done with them.
2065          */
2066         cache_index = 0;
2067         chain = hammer2_chain_scan(parent, NULL, &cache_index,
2068                                    HAMMER2_LOOKUP_NODATA);
2069         while (chain) {
2070                 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
2071                 if (chain->bref.mirror_tid >= sync_tid) {
2072                         ++info->depth;
2073                         error = hammer2_recovery_scan(trans, hmp, chain,
2074                                                       info, sync_tid);
2075                         --info->depth;
2076                         if (error)
2077                                 cumulative_error = error;
2078                 }
2079                 chain = hammer2_chain_scan(parent, chain, &cache_index,
2080                                            HAMMER2_LOOKUP_NODATA);
2081         }
2082
2083         return cumulative_error;
2084 }
2085
2086 /*
2087  * Sync the entire filesystem; this is called from the filesystem syncer
2088  * process periodically and whenever a user calls sync(1) on the hammer
2089  * mountpoint.
2090  *
2091  * Currently is actually called from the syncer! \o/
2092  *
2093  * This task will have to snapshot the state of the dirty inode chain.
2094  * From that, it will have to make sure all of the inodes on the dirty
2095  * chain have IO initiated. We make sure that io is initiated for the root
2096  * block.
2097  *
2098  * If waitfor is set, we wait for media to acknowledge the new rootblock.
2099  *
2100  * THINKS: side A vs side B, to have sync not stall all I/O?
2101  */
2102 int
2103 hammer2_vfs_sync(struct mount *mp, int waitfor)
2104 {
2105         struct hammer2_sync_info info;
2106         hammer2_inode_t *iroot;
2107         hammer2_chain_t *chain;
2108         hammer2_chain_t *parent;
2109         hammer2_pfsmount_t *pmp;
2110         hammer2_mount_t *hmp;
2111         int flags;
2112         int error;
2113         int total_error;
2114         int force_fchain;
2115         int i;
2116         int j;
2117
2118         pmp = MPTOPMP(mp);
2119         iroot = pmp->iroot;
2120         KKASSERT(iroot);
2121         KKASSERT(iroot->pmp == pmp);
2122
2123         /*
2124          * We can't acquire locks on existing vnodes while in a transaction
2125          * without risking a deadlock.  This assumes that vfsync() can be
2126          * called without the vnode locked (which it can in DragonFly).
2127          * Otherwise we'd have to implement a multi-pass or flag the lock
2128          * failures and retry.
2129          *
2130          * The reclamation code interlocks with the sync list's token
2131          * (by removing the vnode from the scan list) before unlocking
2132          * the inode, giving us time to ref the inode.
2133          */
2134         /*flags = VMSC_GETVP;*/
2135         flags = 0;
2136         if (waitfor & MNT_LAZY)
2137                 flags |= VMSC_ONEPASS;
2138
2139         /*
2140          * Start our flush transaction.  This does not return until all
2141          * concurrent transactions have completed and will prevent any
2142          * new transactions from running concurrently, except for the
2143          * buffer cache transactions.
2144          *
2145          * For efficiency do an async pass before making sure with a
2146          * synchronous pass on all related buffer cache buffers.  It
2147          * should theoretically not be possible for any new file buffers
2148          * to be instantiated during this sequence.
2149          */
2150         hammer2_trans_init(&info.trans, pmp, HAMMER2_TRANS_ISFLUSH |
2151                                              HAMMER2_TRANS_PREFLUSH);
2152         hammer2_run_unlinkq(&info.trans, pmp);
2153
2154         info.error = 0;
2155         info.waitfor = MNT_NOWAIT;
2156         vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2157         info.waitfor = MNT_WAIT;
2158         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2159
2160         /*
2161          * Clear PREFLUSH.  This prevents (or asserts on) any new logical
2162          * buffer cache flushes which occur during the flush.  Device buffers
2163          * are not affected.
2164          */
2165
2166 #if 0
2167         if (info.error == 0 && (waitfor & MNT_WAIT)) {
2168                 info.waitfor = waitfor;
2169                     vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2170
2171         }
2172 #endif
2173         hammer2_bioq_sync(info.trans.pmp);
2174         atomic_clear_int(&info.trans.flags, HAMMER2_TRANS_PREFLUSH);
2175
2176         total_error = 0;
2177
2178         /*
2179          * Flush all storage elements making up the cluster
2180          *
2181          * We must also flush any deleted siblings because the super-root
2182          * flush won't do it for us.  They all must be staged or the
2183          * super-root flush will not be able to update its block table
2184          * properly.
2185          *
2186          * XXX currently done serially instead of concurrently
2187          */
2188         for (i = 0; iroot && i < iroot->cluster.nchains; ++i) {
2189                 chain = iroot->cluster.array[i];
2190                 if (chain) {
2191                         hammer2_chain_lock(chain, HAMMER2_RESOLVE_ALWAYS);
2192                         hammer2_flush(&info.trans, &chain);
2193                         hammer2_chain_unlock(chain);
2194                 }
2195                 if (chain) {
2196                         hammer2_chain_t *nchain;
2197                         chain = TAILQ_FIRST(&chain->core->ownerq);
2198                         hammer2_chain_ref(chain);
2199                         while (chain) {
2200                                 hammer2_chain_lock(chain,
2201                                                    HAMMER2_RESOLVE_ALWAYS);
2202                                 hammer2_flush(&info.trans, &chain);
2203                                 hammer2_chain_unlock(chain);
2204                                 nchain = TAILQ_NEXT(chain, core_entry);
2205                                 if (nchain)
2206                                         hammer2_chain_ref(nchain);
2207                                 hammer2_chain_drop(chain);
2208                                 chain = nchain;
2209                         }
2210                 }
2211         }
2212 #if 0
2213         hammer2_trans_done(&info.trans);
2214 #endif
2215
2216         /*
2217          * Flush all volume roots to synchronize PFS flushes with the
2218          * storage media.  Use a super-root transaction for each one.
2219          *
2220          * The flush code will detect super-root -> pfs-root chain
2221          * transitions using the last pfs-root flush.
2222          */
2223         for (i = 0; iroot && i < iroot->cluster.nchains; ++i) {
2224                 chain = iroot->cluster.array[i];
2225                 if (chain == NULL)
2226                         continue;
2227
2228                 hmp = chain->hmp;
2229
2230                 /*
2231                  * We only have to flush each hmp once
2232                  */
2233                 for (j = i - 1; j >= 0; --j) {
2234                         if (iroot->cluster.array[j] &&
2235                             iroot->cluster.array[j]->hmp == hmp)
2236                                 break;
2237                 }
2238                 if (j >= 0)
2239                         continue;
2240                 hammer2_trans_spmp(&info.trans, hmp->spmp);
2241
2242                 /*
2243                  * Force an update of the XID from the PFS root to the
2244                  * topology root.  We couldn't do this from the PFS
2245                  * transaction because a SPMP transaction is needed.
2246                  * This does not modify blocks, instead what it does is
2247                  * allow the flush code to find the transition point and
2248                  * then update on the way back up.
2249                  */
2250                 parent = TAILQ_LAST(&chain->above->ownerq, h2_core_list);
2251                 KKASSERT(chain->pmp != parent->pmp);
2252                 hammer2_chain_setsubmod(&info.trans, parent);
2253
2254                 /*
2255                  * Media mounts have two 'roots', vchain for the topology
2256                  * and fchain for the free block table.  Flush both.
2257                  *
2258                  * Note that the topology and free block table are handled
2259                  * independently, so the free block table can wind up being
2260                  * ahead of the topology.  We depend on the bulk free scan
2261                  * code to deal with any loose ends.
2262                  */
2263                 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
2264                 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
2265                 if ((hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) ||
2266                     hmp->fchain.update_xhi > hmp->fchain.update_xlo) {
2267                         /*
2268                          * This will also modify vchain as a side effect,
2269                          * mark vchain as modified now.
2270                          */
2271                         hammer2_voldata_modify(hmp);
2272                         chain = &hmp->fchain;
2273                         hammer2_flush(&info.trans, &chain);
2274                         KKASSERT(chain == &hmp->fchain);
2275                 }
2276                 hammer2_chain_unlock(&hmp->fchain);
2277                 hammer2_chain_unlock(&hmp->vchain);
2278
2279                 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
2280                 if ((hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) ||
2281                     hmp->vchain.update_xhi > hmp->vchain.update_xlo) {
2282                         chain = &hmp->vchain;
2283                         hammer2_flush(&info.trans, &chain);
2284                         KKASSERT(chain == &hmp->vchain);
2285                         force_fchain = 1;
2286                 } else {
2287                         force_fchain = 0;
2288                 }
2289                 hammer2_chain_unlock(&hmp->vchain);
2290
2291 #if 0
2292                 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
2293                 if ((hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) ||
2294                     hmp->fchain.update_xhi > hmp->fchain.update_xlo ||
2295                     force_fchain) {
2296                         /* this will also modify vchain as a side effect */
2297                         chain = &hmp->fchain;
2298                         hammer2_flush(&info.trans, &chain);
2299                         KKASSERT(chain == &hmp->fchain);
2300                 }
2301                 hammer2_chain_unlock(&hmp->fchain);
2302 #endif
2303
2304                 error = 0;
2305
2306                 /*
2307                  * We can't safely flush the volume header until we have
2308                  * flushed any device buffers which have built up.
2309                  *
2310                  * XXX this isn't being incremental
2311                  */
2312                 vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
2313                 error = VOP_FSYNC(hmp->devvp, MNT_WAIT, 0);
2314                 vn_unlock(hmp->devvp);
2315
2316                 /*
2317                  * The flush code sets CHAIN_VOLUMESYNC to indicate that the
2318                  * volume header needs synchronization via hmp->volsync.
2319                  *
2320                  * XXX synchronize the flag & data with only this flush XXX
2321                  */
2322                 if (error == 0 &&
2323                     (hmp->vchain.flags & HAMMER2_CHAIN_VOLUMESYNC)) {
2324                         struct buf *bp;
2325
2326                         /*
2327                          * Synchronize the disk before flushing the volume
2328                          * header.
2329                          */
2330                         bp = getpbuf(NULL);
2331                         bp->b_bio1.bio_offset = 0;
2332                         bp->b_bufsize = 0;
2333                         bp->b_bcount = 0;
2334                         bp->b_cmd = BUF_CMD_FLUSH;
2335                         bp->b_bio1.bio_done = biodone_sync;
2336                         bp->b_bio1.bio_flags |= BIO_SYNC;
2337                         vn_strategy(hmp->devvp, &bp->b_bio1);
2338                         biowait(&bp->b_bio1, "h2vol");
2339                         relpbuf(bp, NULL);
2340
2341                         /*
2342                          * Then we can safely flush the version of the
2343                          * volume header synchronized by the flush code.
2344                          */
2345                         i = hmp->volhdrno + 1;
2346                         if (i >= HAMMER2_NUM_VOLHDRS)
2347                                 i = 0;
2348                         if (i * HAMMER2_ZONE_BYTES64 + HAMMER2_SEGSIZE >
2349                             hmp->volsync.volu_size) {
2350                                 i = 0;
2351                         }
2352                         kprintf("sync volhdr %d %jd\n",
2353                                 i, (intmax_t)hmp->volsync.volu_size);
2354                         bp = getblk(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2355                                     HAMMER2_PBUFSIZE, 0, 0);
2356                         atomic_clear_int(&hmp->vchain.flags,
2357                                          HAMMER2_CHAIN_VOLUMESYNC);
2358                         bcopy(&hmp->volsync, bp->b_data, HAMMER2_PBUFSIZE);
2359                         bawrite(bp);
2360                         hmp->volhdrno = i;
2361                 }
2362                 if (error)
2363                         total_error = error;
2364
2365 #if 0
2366                 hammer2_trans_done(&info.trans);
2367 #endif
2368         }
2369         hammer2_trans_done(&info.trans);
2370
2371         return (total_error);
2372 }
2373
2374 /*
2375  * Sync passes.
2376  */
2377 static int
2378 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
2379 {
2380         struct hammer2_sync_info *info = data;
2381         hammer2_inode_t *ip;
2382         int error;
2383
2384         /*
2385          *
2386          */
2387         ip = VTOI(vp);
2388         if (ip == NULL)
2389                 return(0);
2390         if (vp->v_type == VNON || vp->v_type == VBAD) {
2391                 vclrisdirty(vp);
2392                 return(0);
2393         }
2394         if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
2395             RB_EMPTY(&vp->v_rbdirty_tree)) {
2396                 vclrisdirty(vp);
2397                 return(0);
2398         }
2399
2400         /*
2401          * VOP_FSYNC will start a new transaction so replicate some code
2402          * here to do it inline (see hammer2_vop_fsync()).
2403          *
2404          * WARNING: The vfsync interacts with the buffer cache and might
2405          *          block, we can't hold the inode lock at that time.
2406          *          However, we MUST ref ip before blocking to ensure that
2407          *          it isn't ripped out from under us (since we do not
2408          *          hold a lock on the vnode).
2409          */
2410         hammer2_inode_ref(ip);
2411         atomic_clear_int(&ip->flags, HAMMER2_INODE_MODIFIED);
2412         if (vp)
2413                 vfsync(vp, MNT_NOWAIT, 1, NULL, NULL);
2414
2415         hammer2_inode_drop(ip);
2416 #if 1
2417         error = 0;
2418         if (error)
2419                 info->error = error;
2420 #endif
2421         return(0);
2422 }
2423
2424 static
2425 int
2426 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
2427 {
2428         return (0);
2429 }
2430
2431 static
2432 int
2433 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
2434                struct fid *fhp, struct vnode **vpp)
2435 {
2436         return (0);
2437 }
2438
2439 static
2440 int
2441 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
2442                  int *exflagsp, struct ucred **credanonp)
2443 {
2444         return (0);
2445 }
2446
2447 /*
2448  * Support code for hammer2_mount().  Read, verify, and install the volume
2449  * header into the HMP
2450  *
2451  * XXX read four volhdrs and use the one with the highest TID whos CRC
2452  *     matches.
2453  *
2454  * XXX check iCRCs.
2455  *
2456  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
2457  *     nonexistant locations.
2458  *
2459  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
2460  */
2461 static
2462 int
2463 hammer2_install_volume_header(hammer2_mount_t *hmp)
2464 {
2465         hammer2_volume_data_t *vd;
2466         struct buf *bp;
2467         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
2468         int error_reported;
2469         int error;
2470         int valid;
2471         int i;
2472
2473         error_reported = 0;
2474         error = 0;
2475         valid = 0;
2476         bp = NULL;
2477
2478         /*
2479          * There are up to 4 copies of the volume header (syncs iterate
2480          * between them so there is no single master).  We don't trust the
2481          * volu_size field so we don't know precisely how large the filesystem
2482          * is, so depend on the OS to return an error if we go beyond the
2483          * block device's EOF.
2484          */
2485         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
2486                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2487                               HAMMER2_VOLUME_BYTES, &bp);
2488                 if (error) {
2489                         brelse(bp);
2490                         bp = NULL;
2491                         continue;
2492                 }
2493
2494                 vd = (struct hammer2_volume_data *) bp->b_data;
2495                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
2496                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
2497                         brelse(bp);
2498                         bp = NULL;
2499                         continue;
2500                 }
2501
2502                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
2503                         /* XXX: Reversed-endianness filesystem */
2504                         kprintf("hammer2: reverse-endian filesystem detected");
2505                         brelse(bp);
2506                         bp = NULL;
2507                         continue;
2508                 }
2509
2510                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
2511                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
2512                                       HAMMER2_VOLUME_ICRC0_SIZE);
2513                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
2514                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
2515                                        HAMMER2_VOLUME_ICRC1_SIZE);
2516                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
2517                         kprintf("hammer2 volume header crc "
2518                                 "mismatch copy #%d %08x/%08x\n",
2519                                 i, crc0, crc);
2520                         error_reported = 1;
2521                         brelse(bp);
2522                         bp = NULL;
2523                         continue;
2524                 }
2525                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
2526                         valid = 1;
2527                         hmp->voldata = *vd;
2528                         hmp->volhdrno = i;
2529                 }
2530                 brelse(bp);
2531                 bp = NULL;
2532         }
2533         if (valid) {
2534                 hmp->volsync = hmp->voldata;
2535                 error = 0;
2536                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
2537                         kprintf("hammer2: using volume header #%d\n",
2538                                 hmp->volhdrno);
2539                 }
2540         } else {
2541                 error = EINVAL;
2542                 kprintf("hammer2: no valid volume headers found!\n");
2543         }
2544         return (error);
2545 }
2546
2547 /*
2548  * Reconnect using the passed file pointer.  The caller must ref the
2549  * fp for us.
2550  */
2551 void
2552 hammer2_cluster_reconnect(hammer2_mount_t *hmp, struct file *fp)
2553 {
2554         size_t name_len;
2555         const char *name = "disk-volume";
2556
2557         /*
2558          * Closes old comm descriptor, kills threads, cleans up
2559          * states, then installs the new descriptor and creates
2560          * new threads.
2561          */
2562         kdmsg_iocom_reconnect(&hmp->iocom, fp, "hammer2");
2563
2564         /*
2565          * Setup LNK_CONN fields for autoinitiated state machine.  We
2566          * will use SPANs to advertise multiple PFSs so only pass the
2567          * fsid and HAMMER2_PFSTYPE_SUPROOT for the AUTOCONN.
2568          *
2569          * We are not initiating a LNK_SPAN so we do not have to set-up
2570          * iocom.auto_lnk_span.
2571          */
2572         bzero(&hmp->iocom.auto_lnk_conn.pfs_clid,
2573               sizeof(hmp->iocom.auto_lnk_conn.pfs_clid));
2574         hmp->iocom.auto_lnk_conn.pfs_fsid = hmp->voldata.fsid;
2575         hmp->iocom.auto_lnk_conn.pfs_type = HAMMER2_PFSTYPE_SUPROOT;
2576         hmp->iocom.auto_lnk_conn.proto_version = DMSG_SPAN_PROTO_1;
2577 #if 0
2578         hmp->iocom.auto_lnk_conn.peer_type = hmp->voldata.peer_type;
2579 #endif
2580         hmp->iocom.auto_lnk_conn.peer_type = DMSG_PEER_HAMMER2;
2581
2582         /*
2583          * Filter adjustment.  Clients do not need visibility into other
2584          * clients (otherwise millions of clients would present a serious
2585          * problem).  The fs_label also serves to restrict the namespace.
2586          */
2587         hmp->iocom.auto_lnk_conn.peer_mask = 1LLU << DMSG_PEER_HAMMER2;
2588         hmp->iocom.auto_lnk_conn.pfs_mask = (uint64_t)-1;
2589
2590 #if 0
2591         switch (ipdata->pfs_type) {
2592         case DMSG_PFSTYPE_CLIENT:
2593                 hmp->iocom.auto_lnk_conn.peer_mask &=
2594                                 ~(1LLU << DMSG_PFSTYPE_CLIENT);
2595                 break;
2596         default:
2597                 break;
2598         }
2599 #endif
2600
2601         name_len = strlen(name);
2602         if (name_len >= sizeof(hmp->iocom.auto_lnk_conn.fs_label))
2603                 name_len = sizeof(hmp->iocom.auto_lnk_conn.fs_label) - 1;
2604         bcopy(name, hmp->iocom.auto_lnk_conn.fs_label, name_len);
2605         hmp->iocom.auto_lnk_conn.fs_label[name_len] = 0;
2606
2607         kdmsg_iocom_autoinitiate(&hmp->iocom, hammer2_autodmsg);
2608 }
2609
2610 static int
2611 hammer2_rcvdmsg(kdmsg_msg_t *msg)
2612 {
2613         kprintf("RCVMSG %08x\n", msg->tcmd);
2614
2615         switch(msg->tcmd) {
2616         case DMSG_DBG_SHELL:
2617                 /*
2618                  * (non-transaction)
2619                  * Execute shell command (not supported atm)
2620                  */
2621                 kdmsg_msg_result(msg, DMSG_ERR_NOSUPP);
2622                 break;
2623         case DMSG_DBG_SHELL | DMSGF_REPLY:
2624                 /*
2625                  * (non-transaction)
2626                  */
2627                 if (msg->aux_data) {
2628                         msg->aux_data[msg->aux_size - 1] = 0;
2629                         kprintf("HAMMER2 DBG: %s\n", msg->aux_data);
2630                 }
2631                 break;
2632         default:
2633                 /*
2634                  * Unsupported message received.  We only need to
2635                  * reply if it's a transaction in order to close our end.
2636                  * Ignore any one-way messages or any further messages
2637                  * associated with the transaction.
2638                  *
2639                  * NOTE: This case also includes DMSG_LNK_ERROR messages
2640                  *       which might be one-way, replying to those would
2641                  *       cause an infinite ping-pong.
2642                  */
2643                 if (msg->any.head.cmd & DMSGF_CREATE)
2644                         kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
2645                 break;
2646         }
2647         return(0);
2648 }
2649
2650 /*
2651  * This function is called after KDMSG has automatically handled processing
2652  * of a LNK layer message (typically CONN, SPAN, or CIRC).
2653  *
2654  * We tag off the LNK_CONN to trigger our LNK_VOLCONF messages which
2655  * advertises all available hammer2 super-root volumes.
2656  */
2657 static void
2658 hammer2_autodmsg(kdmsg_msg_t *msg)
2659 {
2660         hammer2_mount_t *hmp = msg->iocom->handle;
2661         int copyid;
2662
2663         kprintf("RCAMSG %08x\n", msg->tcmd);
2664
2665         switch(msg->tcmd) {
2666         case DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_REPLY:
2667         case DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_DELETE | DMSGF_REPLY:
2668                 if (msg->any.head.cmd & DMSGF_CREATE) {
2669                         kprintf("HAMMER2: VOLDATA DUMP\n");
2670
2671                         /*
2672                          * Dump the configuration stored in the volume header.
2673                          * This will typically be import/export access rights,
2674                          * master encryption keys (encrypted), etc.
2675                          */
2676                         hammer2_voldata_lock(hmp);
2677                         copyid = 0;
2678                         while (copyid < HAMMER2_COPYID_COUNT) {
2679                                 if (hmp->voldata.copyinfo[copyid].copyid)
2680                                         hammer2_volconf_update(hmp, copyid);
2681                                 ++copyid;
2682                         }
2683                         hammer2_voldata_unlock(hmp);
2684
2685                         kprintf("HAMMER2: INITIATE SPANs\n");
2686                         hammer2_update_spans(hmp);
2687                 }
2688                 if ((msg->any.head.cmd & DMSGF_DELETE) &&
2689                     msg->state && (msg->state->txcmd & DMSGF_DELETE) == 0) {
2690                         kprintf("HAMMER2: CONN WAS TERMINATED\n");
2691                 }
2692                 break;
2693         default:
2694                 break;
2695         }
2696 }
2697
2698 /*
2699  * Update LNK_SPAN state
2700  */
2701 void
2702 hammer2_update_spans(hammer2_mount_t *hmp)
2703 {
2704         const hammer2_inode_data_t *ipdata;
2705         hammer2_cluster_t *cparent;
2706         hammer2_cluster_t *cluster;
2707         hammer2_pfsmount_t *spmp;
2708         hammer2_key_t key_next;
2709         kdmsg_msg_t *rmsg;
2710         size_t name_len;
2711         int ddflag;
2712
2713         /*
2714          * Lookup mount point under the media-localized super-root.
2715          *
2716          * cluster->pmp will incorrectly point to spmp and must be fixed
2717          * up later on.
2718          */
2719         spmp = hmp->spmp;
2720         cparent = hammer2_inode_lock_ex(spmp->iroot);
2721         cluster = hammer2_cluster_lookup(cparent, &key_next,
2722                                          HAMMER2_KEY_MIN,
2723                                          HAMMER2_KEY_MAX,
2724                                          0, &ddflag);
2725         while (cluster) {
2726                 if (hammer2_cluster_type(cluster) != HAMMER2_BREF_TYPE_INODE)
2727                         continue;
2728                 ipdata = &hammer2_cluster_data(cluster)->ipdata;
2729                 kprintf("UPDATE SPANS: %s\n", ipdata->filename);
2730
2731                 rmsg = kdmsg_msg_alloc(&hmp->iocom, NULL,
2732                                        DMSG_LNK_SPAN | DMSGF_CREATE,
2733                                        hammer2_lnk_span_reply, NULL);
2734                 rmsg->any.lnk_span.pfs_clid = ipdata->pfs_clid;
2735                 rmsg->any.lnk_span.pfs_fsid = ipdata->pfs_fsid;
2736                 rmsg->any.lnk_span.pfs_type = ipdata->pfs_type;
2737                 rmsg->any.lnk_span.peer_type = DMSG_PEER_HAMMER2;
2738                 rmsg->any.lnk_span.proto_version = DMSG_SPAN_PROTO_1;
2739                 name_len = ipdata->name_len;
2740                 if (name_len >= sizeof(rmsg->any.lnk_span.fs_label))
2741                         name_len = sizeof(rmsg->any.lnk_span.fs_label) - 1;
2742                 bcopy(ipdata->filename, rmsg->any.lnk_span.fs_label, name_len);
2743
2744                 kdmsg_msg_write(rmsg);
2745
2746                 cluster = hammer2_cluster_next(cparent, cluster,
2747                                                &key_next,
2748                                                key_next,
2749                                                HAMMER2_KEY_MAX,
2750                                                0);
2751         }
2752         hammer2_inode_unlock_ex(spmp->iroot, cparent);
2753 }
2754
2755 static
2756 int
2757 hammer2_lnk_span_reply(kdmsg_state_t *state, kdmsg_msg_t *msg)
2758 {
2759         if ((state->txcmd & DMSGF_DELETE) == 0 &&
2760             (msg->any.head.cmd & DMSGF_DELETE)) {
2761                 kdmsg_msg_reply(msg, 0);
2762         }
2763         return 0;
2764 }
2765
2766 /*
2767  * Volume configuration updates are passed onto the userland service
2768  * daemon via the open LNK_CONN transaction.
2769  */
2770 void
2771 hammer2_volconf_update(hammer2_mount_t *hmp, int index)
2772 {
2773         kdmsg_msg_t *msg;
2774
2775         /* XXX interlock against connection state termination */
2776         kprintf("volconf update %p\n", hmp->iocom.conn_state);
2777         if (hmp->iocom.conn_state) {
2778                 kprintf("TRANSMIT VOLCONF VIA OPEN CONN TRANSACTION\n");
2779                 msg = kdmsg_msg_alloc_state(hmp->iocom.conn_state,
2780                                             DMSG_LNK_HAMMER2_VOLCONF,
2781                                             NULL, NULL);
2782                 H2_LNK_VOLCONF(msg)->copy = hmp->voldata.copyinfo[index];
2783                 H2_LNK_VOLCONF(msg)->mediaid = hmp->voldata.fsid;
2784                 H2_LNK_VOLCONF(msg)->index = index;
2785                 kdmsg_msg_write(msg);
2786         }
2787 }
2788
2789 /*
2790  * This handles hysteresis on regular file flushes.  Because the BIOs are
2791  * routed to a thread it is possible for an excessive number to build up
2792  * and cause long front-end stalls long before the runningbuffspace limit
2793  * is hit, so we implement hammer2_flush_pipe to control the
2794  * hysteresis.
2795  *
2796  * This is a particular problem when compression is used.
2797  */
2798 void
2799 hammer2_lwinprog_ref(hammer2_pfsmount_t *pmp)
2800 {
2801         atomic_add_int(&pmp->count_lwinprog, 1);
2802 }
2803
2804 void
2805 hammer2_lwinprog_drop(hammer2_pfsmount_t *pmp)
2806 {
2807         int lwinprog;
2808
2809         lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1);
2810         if ((lwinprog & HAMMER2_LWINPROG_WAITING) &&
2811             (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) {
2812                 atomic_clear_int(&pmp->count_lwinprog,
2813                                  HAMMER2_LWINPROG_WAITING);
2814                 wakeup(&pmp->count_lwinprog);
2815         }
2816 }
2817
2818 void
2819 hammer2_lwinprog_wait(hammer2_pfsmount_t *pmp)
2820 {
2821         int lwinprog;
2822
2823         for (;;) {
2824                 lwinprog = pmp->count_lwinprog;
2825                 cpu_ccfence();
2826                 if ((lwinprog & HAMMER2_LWINPROG_MASK) < hammer2_flush_pipe)
2827                         break;
2828                 tsleep_interlock(&pmp->count_lwinprog, 0);
2829                 atomic_set_int(&pmp->count_lwinprog, HAMMER2_LWINPROG_WAITING);
2830                 lwinprog = pmp->count_lwinprog;
2831                 if ((lwinprog & HAMMER2_LWINPROG_MASK) < hammer2_flush_pipe)
2832                         break;
2833                 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz);
2834         }
2835 }
2836
2837 /*
2838  * Manage excessive memory resource use for chain and related
2839  * structures.
2840  */
2841 void
2842 hammer2_pfs_memory_wait(hammer2_pfsmount_t *pmp)
2843 {
2844         long waiting;
2845         long count;
2846         long limit;
2847 #if 0
2848         static int zzticks;
2849 #endif
2850
2851         /*
2852          * Atomic check condition and wait.  Also do an early speedup of
2853          * the syncer to try to avoid hitting the wait.
2854          */
2855         for (;;) {
2856                 waiting = pmp->inmem_dirty_chains;
2857                 cpu_ccfence();
2858                 count = waiting & HAMMER2_DIRTYCHAIN_MASK;
2859
2860                 limit = pmp->mp->mnt_nvnodelistsize / 10;
2861                 if (limit < hammer2_limit_dirty_chains)
2862                         limit = hammer2_limit_dirty_chains;
2863                 if (limit < 1000)
2864                         limit = 1000;
2865
2866 #if 0
2867                 if ((int)(ticks - zzticks) > hz) {
2868                         zzticks = ticks;
2869                         kprintf("count %ld %ld\n", count, limit);
2870                 }
2871 #endif
2872
2873                 /*
2874                  * Block if there are too many dirty chains present, wait
2875                  * for the flush to clean some out.
2876                  */
2877                 if (count > limit) {
2878                         tsleep_interlock(&pmp->inmem_dirty_chains, 0);
2879                         if (atomic_cmpset_long(&pmp->inmem_dirty_chains,
2880                                                waiting,
2881                                        waiting | HAMMER2_DIRTYCHAIN_WAITING)) {
2882                                 speedup_syncer(pmp->mp);
2883                                 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED,
2884                                        "chnmem", hz);
2885                         }
2886                         continue;       /* loop on success or fail */
2887                 }
2888
2889                 /*
2890                  * Try to start an early flush before we are forced to block.
2891                  */
2892                 if (count > limit * 7 / 10)
2893                         speedup_syncer(pmp->mp);
2894                 break;
2895         }
2896 }
2897
2898 void
2899 hammer2_pfs_memory_inc(hammer2_pfsmount_t *pmp)
2900 {
2901         if (pmp)
2902                 atomic_add_long(&pmp->inmem_dirty_chains, 1);
2903 }
2904
2905 void
2906 hammer2_pfs_memory_wakeup(hammer2_pfsmount_t *pmp)
2907 {
2908         long waiting;
2909
2910         if (pmp == NULL)
2911                 return;
2912
2913         for (;;) {
2914                 waiting = pmp->inmem_dirty_chains;
2915                 cpu_ccfence();
2916                 if (atomic_cmpset_long(&pmp->inmem_dirty_chains,
2917                                        waiting,
2918                                        (waiting - 1) &
2919                                         ~HAMMER2_DIRTYCHAIN_WAITING)) {
2920                         break;
2921                 }
2922         }
2923
2924         if (waiting & HAMMER2_DIRTYCHAIN_WAITING)
2925                 wakeup(&pmp->inmem_dirty_chains);
2926 }
2927
2928 /*
2929  * Debugging
2930  */
2931 void
2932 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx)
2933 {
2934         hammer2_chain_t *scan;
2935         hammer2_chain_t *first_parent;
2936
2937         --*countp;
2938         if (*countp == 0) {
2939                 kprintf("%*.*s...\n", tab, tab, "");
2940                 return;
2941         }
2942         if (*countp < 0)
2943                 return;
2944         first_parent = chain->core ? TAILQ_FIRST(&chain->core->ownerq) : NULL;
2945         kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n",
2946                 tab, tab, "", pfx,
2947                 chain, chain->bref.type,
2948                 chain->bref.key, chain->bref.keybits,
2949                 chain->bref.mirror_tid);
2950
2951         kprintf("%*.*s      [%08x] (%s) mod=%08x del=%08x "
2952                 "lo=%08x hi=%08x refs=%d\n",
2953                 tab, tab, "",
2954                 chain->flags,
2955                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
2956                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
2957                 chain->modify_xid,
2958                 chain->delete_xid,
2959                 chain->update_xlo,
2960                 chain->update_xhi,
2961                 chain->refs);
2962
2963         kprintf("%*.*s      core %p [%08x]",
2964                 tab, tab, "",
2965                 chain->core, (chain->core ? chain->core->flags : 0));
2966
2967         if (first_parent)
2968                 kprintf("\n%*.*s      fp=%p np=%p [fpflags %08x fprefs %d",
2969                         tab, tab, "",
2970                         first_parent,
2971                         (first_parent ? TAILQ_NEXT(first_parent, core_entry) :
2972                                         NULL),
2973                         first_parent->flags,
2974                         first_parent->refs);
2975         if (chain->core == NULL || RB_EMPTY(&chain->core->rbtree))
2976                 kprintf("\n");
2977         else
2978                 kprintf(" {\n");
2979         if (chain->core) {
2980                 RB_FOREACH(scan, hammer2_chain_tree, &chain->core->rbtree)
2981                         hammer2_dump_chain(scan, tab + 4, countp, 'a');
2982                 RB_FOREACH(scan, hammer2_chain_tree, &chain->core->dbtree)
2983                         hammer2_dump_chain(scan, tab + 4, countp, 'r');
2984                 TAILQ_FOREACH(scan, &chain->core->dbq, db_entry)
2985                         hammer2_dump_chain(scan, tab + 4, countp, 'd');
2986         }
2987         if (chain->core && !RB_EMPTY(&chain->core->rbtree)) {
2988                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
2989                         kprintf("%*.*s}(%s)\n", tab, tab, "",
2990                                 chain->data->ipdata.filename);
2991                 else
2992                         kprintf("%*.*s}\n", tab, tab, "");
2993         }
2994 }