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->list_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                 spin_init(&hmp->io_spin);
 529                 spin_init(&hmp->list_spin);
 530                 TAILQ_INIT(&hmp->flushq);
 531
 532                 lockinit(&hmp->vollk, "h2vol", 0, 0);
 533
 534                 /*
 535                  * vchain setup. vchain.data is embedded.
 536                  * vchain.refs is initialized and will never drop to 0.
 537                  *
 538                  * NOTE! voldata is not yet loaded.
 539                  */
 540                 hmp->vchain.hmp = hmp;
 541                 hmp->vchain.refs = 1;
 542                 hmp->vchain.data = (void *)&hmp->voldata;
 543                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
 544                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 545                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
 546
 547                 hammer2_chain_core_alloc(NULL, &hmp->vchain);
 548                 /* hmp->vchain.u.xxx is left NULL */
 549
 550                 /*
 551                  * fchain setup.  fchain.data is embedded.
 552                  * fchain.refs is initialized and will never drop to 0.
 553                  *
 554                  * The data is not used but needs to be initialized to
 555                  * pass assertion muster.  We use this chain primarily
 556                  * as a placeholder for the freemap's top-level RBTREE
 557                  * so it does not interfere with the volume's topology
 558                  * RBTREE.
 559                  */
 560                 hmp->fchain.hmp = hmp;
 561                 hmp->fchain.refs = 1;
 562                 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
 563                 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
 564                 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 565                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
 566                 hmp->fchain.bref.methods =
 567                         HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
 568                         HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
 569
 570                 hammer2_chain_core_alloc(NULL, &hmp->fchain);
 571                 /* hmp->fchain.u.xxx is left NULL */
 572
 573                 /*
 574                  * Install the volume header and initialize fields from
 575                  * voldata.
 576                  */
 577                 error = hammer2_install_volume_header(hmp);
 578                 if (error) {
 579                         ++hmp->pmp_count;
 580                         hammer2_vfs_unmount_hmp1(mp, hmp);
 581                         hammer2_vfs_unmount_hmp2(mp, hmp);
 582                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 583                         hammer2_vfs_unmount(mp, MNT_FORCE);
 584                         return error;
 585                 }
 586
 587                 /*
 588                  * Really important to get these right or flush will get
 589                  * confused.
 590                  */
 591                 hmp->spmp = hammer2_pfsalloc(NULL, hmp->voldata.mirror_tid);
 592                 kprintf("alloc spmp %p tid %016jx\n",
 593                         hmp->spmp, hmp->voldata.mirror_tid);
 594                 spmp = hmp->spmp;
 595                 spmp->inode_tid = 1;
 596
 597                 xid = 0;
 598                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
 599                 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid;
 600                 hmp->vchain.pmp = spmp;
 601                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
 602                 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid;
 603                 hmp->fchain.pmp = spmp;
 604
 605                 /*
 606                  * First locate the super-root inode, which is key 0
 607                  * relative to the volume header's blockset.
 608                  *
 609                  * Then locate the root inode by scanning the directory keyspace
 610                  * represented by the label.
 611                  */
 612                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
 613                 schain = hammer2_chain_lookup(&parent, &key_dummy,
 614                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
 615                                       &cache_index, 0, &ddflag);
 616                 hammer2_chain_lookup_done(parent);
 617                 if (schain == NULL) {
 618                         kprintf("hammer2_mount: invalid super-root\n");
 619                         ++hmp->pmp_count;
 620                         hammer2_vfs_unmount_hmp1(mp, hmp);
 621                         hammer2_vfs_unmount_hmp2(mp, hmp);
 622                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 623                         hammer2_vfs_unmount(mp, MNT_FORCE);
 624                         return EINVAL;
 625                 }
 626
 627                 /*
 628                  * Sanity-check schain's pmp, finish initializing spmp.
 629                  */
 630                 KKASSERT(schain->pmp == spmp);
 631                 spmp->pfs_clid = schain->data->ipdata.pfs_clid;
 632
 633                 /*
 634                  * NOTE: inode_get sucks up schain's lock.
 635                  */
 636                 cluster = hammer2_cluster_from_chain(schain);
 637                 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster);
 638                 spmp->spmp_hmp = hmp;
 639                 hammer2_inode_ref(spmp->iroot);
 640                 hammer2_inode_unlock_ex(spmp->iroot, cluster);
 641                 schain = NULL;
 642                 /* leave spmp->iroot with one ref */
 643
 644                 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
 645                         error = hammer2_recovery(hmp);
 646                         /* XXX do something with error */
 647                 }
 648                 ++hmp->pmp_count;
 649
 650                 /*
 651                  * XXX RDONLY stuff is totally broken FIXME XXX
 652                  *
 653                  * Automatic LNK_CONN
 654                  * Automatic handling of received LNK_SPAN
 655                  * Automatic handling of received LNK_CIRC
 656                  * No automatic LNK_SPAN generation - we do this ourselves
 657                  * No automatic LNK_CIRC generation - we do this ourselves
 658                  */
 659                 kdmsg_iocom_init(&hmp->iocom, hmp,
 660                                  KDMSG_IOCOMF_AUTOCONN |
 661                                  KDMSG_IOCOMF_AUTORXSPAN,
 662                                  hmp->mchain, hammer2_rcvdmsg);
 663
 664                 /*
 665                  * Ref the cluster management messaging descriptor.  The mount
 666                  * program deals with the other end of the communications pipe.
 667                  */
 668                 fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
 669                 if (fp) {
 670                         hammer2_cluster_reconnect(hmp, fp);
 671                 } else {
 672                         kprintf("hammer2_mount: bad cluster_fd!\n");
 673                 }
 674         } else {
 675                 spmp = hmp->spmp;
 676                 ++hmp->pmp_count;
 677         }
 678
 679         /*
 680          * Lookup mount point under the media-localized super-root.
 681          *
 682          * cluster->pmp will incorrectly point to spmp and must be fixed
 683          * up later on.
 684          */
 685         cparent = hammer2_inode_lock_ex(spmp->iroot);
 686         lhc = hammer2_dirhash(label, strlen(label));
 687         cluster = hammer2_cluster_lookup(cparent, &key_next,
 688                                       lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 689                                       0, &ddflag);
 690         while (cluster) {
 691                 if (hammer2_cluster_type(cluster) == HAMMER2_BREF_TYPE_INODE &&
 692                     strcmp(label,
 693                        hammer2_cluster_data(cluster)->ipdata.filename) == 0) {
 694                         break;
 695                 }
 696                 cluster = hammer2_cluster_next(cparent, cluster, &key_next,
 697                                             key_next,
 698                                             lhc + HAMMER2_DIRHASH_LOMASK, 0);
 699         }
 700         hammer2_inode_unlock_ex(spmp->iroot, cparent);
 701
 702         if (cluster == NULL) {
 703                 kprintf("hammer2_mount: PFS label not found\n");
 704                 hammer2_vfs_unmount_hmp1(mp, hmp);
 705                 hammer2_vfs_unmount_hmp2(mp, hmp);
 706                 lockmgr(&hammer2_mntlk, LK_RELEASE);
 707                 hammer2_vfs_unmount(mp, MNT_FORCE);
 708                 return EINVAL;
 709         }
 710
 711         for (i = 0; i < cluster->nchains; ++i) {
 712                 rchain = cluster->array[i];
 713                 if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
 714                         kprintf("hammer2_mount: PFS label already mounted!\n");
 715                         hammer2_cluster_unlock(cluster);
 716                         hammer2_vfs_unmount_hmp1(mp, hmp);
 717                         hammer2_vfs_unmount_hmp2(mp, hmp);
 718                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 719                         hammer2_vfs_unmount(mp, MNT_FORCE);
 720                         return EBUSY;
 721                 }
 722                 KKASSERT(rchain->pmp == NULL);
 723 #if 0
 724                 if (rchain->flags & HAMMER2_CHAIN_RECYCLE) {
 725                         kprintf("hammer2_mount: PFS label is recycling\n");
 726                         hammer2_cluster_unlock(cluster);
 727                         hammer2_vfs_unmount_hmp1(mp, hmp);
 728                         hammer2_vfs_unmount_hmp2(mp, hmp);
 729                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 730                         hammer2_vfs_unmount(mp, MNT_FORCE);
 731                         return EBUSY;
 732                 }
 733 #endif
 734         }
 735
 736         /*
 737          * Check to see if the cluster id is already mounted at the mount
 738          * point.  If it is, add us to the cluster.
 739          */
 740         ipdata = &hammer2_cluster_data(cluster)->ipdata;
 741         hammer2_cluster_bref(cluster, &bref);
 742         TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
 743                 if (pmp->spmp_hmp == NULL &&
 744                     bcmp(&pmp->pfs_clid, &ipdata->pfs_clid,
 745                          sizeof(pmp->pfs_clid)) == 0) {
 746                         break;
 747                 }
 748         }
 749
 750         if (pmp) {
 751                 int i;
 752                 int j;
 753
 754                 hammer2_inode_ref(pmp->iroot);
 755                 ccms_thread_lock(&pmp->iroot->topo_cst, CCMS_STATE_EXCLUSIVE);
 756
 757                 if (pmp->iroot->cluster.nchains + cluster->nchains >
 758                     HAMMER2_MAXCLUSTER) {
 759                         kprintf("hammer2_mount: cluster full!\n");
 760
 761                         ccms_thread_unlock(&pmp->iroot->topo_cst);
 762                         hammer2_inode_drop(pmp->iroot);
 763
 764                         hammer2_cluster_unlock(cluster);
 765                         hammer2_vfs_unmount_hmp1(mp, hmp);
 766                         hammer2_vfs_unmount_hmp2(mp, hmp);
 767                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 768                         hammer2_vfs_unmount(mp, MNT_FORCE);
 769                         return EBUSY;
 770                 }
 771                 kprintf("hammer2_vfs_mount: Adding pfs to existing cluster\n");
 772                 j = pmp->iroot->cluster.nchains;
 773                 for (i = 0; i < cluster->nchains; ++i) {
 774                         rchain = cluster->array[i];
 775                         KKASSERT(rchain->pmp == NULL);
 776                         rchain->pmp = pmp;
 777                         hammer2_chain_ref(cluster->array[i]);
 778                         pmp->iroot->cluster.array[j] = cluster->array[i];
 779                         ++j;
 780                 }
 781                 pmp->iroot->cluster.nchains = j;
 782                 ccms_thread_unlock(&pmp->iroot->topo_cst);
 783                 hammer2_inode_drop(pmp->iroot);
 784                 hammer2_cluster_unlock(cluster);
 785                 lockmgr(&hammer2_mntlk, LK_RELEASE);
 786
 787                 kprintf("ok\n");
 788                 hammer2_inode_install_hidden(pmp);
 789
 790                 return ERANGE;
 791         }
 792
 793         /*
 794          * Block device opened successfully, finish initializing the
 795          * mount structure.
 796          *
 797          * From this point on we have to call hammer2_unmount() on failure.
 798          */
 799         pmp = hammer2_pfsalloc(ipdata, bref.mirror_tid);
 800         kprintf("PMP mirror_tid is %016jx\n", bref.mirror_tid);
 801         for (i = 0; i < cluster->nchains; ++i) {
 802                 rchain = cluster->array[i];
 803                 KKASSERT(rchain->pmp == NULL);
 804                 rchain->pmp = pmp;
 805                 atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
 806         }
 807         cluster->pmp = pmp;
 808
 809         ccms_domain_init(&pmp->ccms_dom);
 810         TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry);
 811         lockmgr(&hammer2_mntlk, LK_RELEASE);
 812
 813         kprintf("hammer2_mount hmp=%p pmp=%p pmpcnt=%d\n",
 814                 hmp, pmp, hmp->pmp_count);
 815
 816         mp->mnt_flag = MNT_LOCAL;
 817         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
 818         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
 819
 820         /*
 821          * required mount structure initializations
 822          */
 823         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
 824         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
 825
 826         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
 827         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 828
 829         /*
 830          * Optional fields
 831          */
 832         mp->mnt_iosize_max = MAXPHYS;
 833         mp->mnt_data = (qaddr_t)pmp;
 834         pmp->mp = mp;
 835
 836         /*
 837          * After this point hammer2_vfs_unmount() has visibility on hmp
 838          * and manual hmp1/hmp2 calls are not needed on fatal errors.
 839          */
 840         pmp->iroot = hammer2_inode_get(pmp, NULL, cluster);
 841         hammer2_inode_ref(pmp->iroot);          /* ref for pmp->iroot */
 842         hammer2_inode_unlock_ex(pmp->iroot, cluster);
 843
 844         /*
 845          * The logical file buffer bio write thread handles things
 846          * like physical block assignment and compression.
 847          *
 848          * (only applicable to pfs mounts, not applicable to spmp)
 849          */
 850         pmp->wthread_destroy = 0;
 851         lwkt_create(hammer2_write_thread, pmp,
 852                     &pmp->wthread_td, NULL, 0, -1, "hwrite-%s", label);
 853
 854         /*
 855          * With the cluster operational install ihidden.
 856          * (only applicable to pfs mounts, not applicable to spmp)
 857          */
 858         hammer2_inode_install_hidden(pmp);
 859
 860         /*
 861          * Finish setup
 862          */
 863         vfs_getnewfsid(mp);
 864         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
 865         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
 866         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
 867
 868         copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 869         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 870         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
 871         copyinstr(path, mp->mnt_stat.f_mntonname,
 872                   sizeof(mp->mnt_stat.f_mntonname) - 1,
 873                   &size);
 874
 875         /*
 876          * Initial statfs to prime mnt_stat.
 877          */
 878         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
 879
 880         return 0;
 881 }
 882
 883 /*
 884  * Handle bioq for strategy write
 885  */
 886 static
 887 void
 888 hammer2_write_thread(void *arg)
 889 {
 890         hammer2_pfsmount_t *pmp;
 891         struct bio *bio;
 892         struct buf *bp;
 893         hammer2_trans_t trans;
 894         struct vnode *vp;
 895         hammer2_inode_t *ip;
 896         hammer2_cluster_t *cparent;
 897         hammer2_inode_data_t *wipdata;
 898         hammer2_key_t lbase;
 899         int lblksize;
 900         int pblksize;
 901         int error;
 902
 903         pmp = arg;
 904
 905         mtx_lock(&pmp->wthread_mtx);
 906         while (pmp->wthread_destroy == 0) {
 907                 if (bioq_first(&pmp->wthread_bioq) == NULL) {
 908                         mtxsleep(&pmp->wthread_bioq, &pmp->wthread_mtx,
 909                                  0, "h2bioqw", 0);
 910                 }
 911                 cparent = NULL;
 912
 913                 hammer2_trans_init(&trans, pmp, HAMMER2_TRANS_BUFCACHE);
 914
 915                 while ((bio = bioq_takefirst(&pmp->wthread_bioq)) != NULL) {
 916                         /*
 917                          * dummy bio for synchronization.  The transaction
 918                          * must be reinitialized.
 919                          */
 920                         if (bio->bio_buf == NULL) {
 921                                 bio->bio_flags |= BIO_DONE;
 922                                 wakeup(bio);
 923                                 hammer2_trans_done(&trans);
 924                                 hammer2_trans_init(&trans, pmp,
 925                                                    HAMMER2_TRANS_BUFCACHE);
 926                                 continue;
 927                         }
 928
 929                         /*
 930                          * else normal bio processing
 931                          */
 932                         mtx_unlock(&pmp->wthread_mtx);
 933
 934                         hammer2_lwinprog_drop(pmp);
 935
 936                         error = 0;
 937                         bp = bio->bio_buf;
 938                         vp = bp->b_vp;
 939                         ip = VTOI(vp);
 940
 941                         /*
 942                          * Inode is modified, flush size and mtime changes
 943                          * to ensure that the file size remains consistent
 944                          * with the buffers being flushed.
 945                          *
 946                          * NOTE: The inode_fsync() call only flushes the
 947                          *       inode's meta-data state, it doesn't try
 948                          *       to flush underlying buffers or chains.
 949                          */
 950                         cparent = hammer2_inode_lock_ex(ip);
 951                         if (ip->flags & (HAMMER2_INODE_RESIZED |
 952                                          HAMMER2_INODE_MTIME)) {
 953                                 hammer2_inode_fsync(&trans, ip, cparent);
 954                         }
 955                         wipdata = hammer2_cluster_modify_ip(&trans, ip,
 956                                                          cparent, 0);
 957                         lblksize = hammer2_calc_logical(ip, bio->bio_offset,
 958                                                         &lbase, NULL);
 959                         pblksize = hammer2_calc_physical(ip, wipdata, lbase);
 960                         hammer2_write_file_core(bp, &trans, ip, wipdata,
 961                                                 cparent,
 962                                                 lbase, IO_ASYNC,
 963                                                 pblksize, &error);
 964                         hammer2_cluster_modsync(cparent);
 965                         hammer2_inode_unlock_ex(ip, cparent);
 966                         if (error) {
 967                                 kprintf("hammer2: error in buffer write\n");
 968                                 bp->b_flags |= B_ERROR;
 969                                 bp->b_error = EIO;
 970                         }
 971                         biodone(bio);
 972                         mtx_lock(&pmp->wthread_mtx);
 973                 }
 974                 hammer2_trans_done(&trans);
 975         }
 976         pmp->wthread_destroy = -1;
 977         wakeup(&pmp->wthread_destroy);
 978
 979         mtx_unlock(&pmp->wthread_mtx);
 980 }
 981
 982 void
 983 hammer2_bioq_sync(hammer2_pfsmount_t *pmp)
 984 {
 985         struct bio sync_bio;
 986
 987         bzero(&sync_bio, sizeof(sync_bio));     /* dummy with no bio_buf */
 988         mtx_lock(&pmp->wthread_mtx);
 989         if (pmp->wthread_destroy == 0 &&
 990             TAILQ_FIRST(&pmp->wthread_bioq.queue)) {
 991                 bioq_insert_tail(&pmp->wthread_bioq, &sync_bio);
 992                 while ((sync_bio.bio_flags & BIO_DONE) == 0)
 993                         mtxsleep(&sync_bio, &pmp->wthread_mtx, 0, "h2bioq", 0);
 994         }
 995         mtx_unlock(&pmp->wthread_mtx);
 996 }
 997
 998 /*
 999  * Return a chain suitable for I/O, creating the chain if necessary
1000  * and assigning its physical block.
1001  */
1002 static
1003 hammer2_cluster_t *
1004 hammer2_assign_physical(hammer2_trans_t *trans,
1005                         hammer2_inode_t *ip, hammer2_cluster_t *cparent,
1006                         hammer2_key_t lbase, int pblksize, int *errorp)
1007 {
1008         hammer2_cluster_t *cluster;
1009         hammer2_cluster_t *dparent;
1010         hammer2_key_t key_dummy;
1011         int pradix = hammer2_getradix(pblksize);
1012         int ddflag;
1013
1014         /*
1015          * Locate the chain associated with lbase, return a locked chain.
1016          * However, do not instantiate any data reference (which utilizes a
1017          * device buffer) because we will be using direct IO via the
1018          * logical buffer cache buffer.
1019          */
1020         *errorp = 0;
1021         KKASSERT(pblksize >= HAMMER2_ALLOC_MIN);
1022 retry:
1023         dparent = hammer2_cluster_lookup_init(cparent, 0);
1024         cluster = hammer2_cluster_lookup(dparent, &key_dummy,
1025                                      lbase, lbase,
1026                                      HAMMER2_LOOKUP_NODATA, &ddflag);
1027
1028         if (cluster == NULL) {
1029                 /*
1030                  * We found a hole, create a new chain entry.
1031                  *
1032                  * NOTE: DATA chains are created without device backing
1033                  *       store (nor do we want any).
1034                  */
1035                 *errorp = hammer2_cluster_create(trans, dparent, &cluster,
1036                                                lbase, HAMMER2_PBUFRADIX,
1037                                                HAMMER2_BREF_TYPE_DATA,
1038                                                pblksize, 0);
1039                 if (cluster == NULL) {
1040                         hammer2_cluster_lookup_done(dparent);
1041                         panic("hammer2_cluster_create: par=%p error=%d\n",
1042                                 dparent->focus, *errorp);
1043                         goto retry;
1044                 }
1045                 /*ip->delta_dcount += pblksize;*/
1046         } else {
1047                 switch (hammer2_cluster_type(cluster)) {
1048                 case HAMMER2_BREF_TYPE_INODE:
1049                         /*
1050                          * The data is embedded in the inode.  The
1051                          * caller is responsible for marking the inode
1052                          * modified and copying the data to the embedded
1053                          * area.
1054                          */
1055                         break;
1056                 case HAMMER2_BREF_TYPE_DATA:
1057                         if (hammer2_cluster_need_resize(cluster, pblksize)) {
1058                                 hammer2_cluster_resize(trans, ip,
1059                                                      dparent, cluster,
1060                                                      pradix,
1061                                                      HAMMER2_MODIFY_OPTDATA);
1062                         }
1063
1064                         /*
1065                          * DATA buffers must be marked modified whether the
1066                          * data is in a logical buffer or not.  We also have
1067                          * to make this call to fixup the chain data pointers
1068                          * after resizing in case this is an encrypted or
1069                          * compressed buffer.
1070                          */
1071                         hammer2_cluster_modify(trans, cluster,
1072                                                HAMMER2_MODIFY_OPTDATA);
1073                         break;
1074                 default:
1075                         panic("hammer2_assign_physical: bad type");
1076                         /* NOT REACHED */
1077                         break;
1078                 }
1079         }
1080
1081         /*
1082          * Cleanup.  If cluster wound up being the inode itself, i.e.
1083          * the DIRECTDATA case for offset 0, then we need to update cparent.
1084          * The caller expects cparent to not become stale.
1085          */
1086         hammer2_cluster_lookup_done(dparent);
1087         /* dparent = NULL; safety */
1088         if (cluster && ddflag)
1089                 hammer2_cluster_replace_locked(cparent, cluster);
1090         return (cluster);
1091 }
1092
1093 /*
1094  * From hammer2_vnops.c.
1095  * The core write function which determines which path to take
1096  * depending on compression settings.
1097  */
1098 static
1099 void
1100 hammer2_write_file_core(struct buf *bp, hammer2_trans_t *trans,
1101                         hammer2_inode_t *ip, hammer2_inode_data_t *ipdata,
1102                         hammer2_cluster_t *cparent,
1103                         hammer2_key_t lbase, int ioflag, int pblksize,
1104                         int *errorp)
1105 {
1106         hammer2_cluster_t *cluster;
1107
1108         switch(HAMMER2_DEC_COMP(ipdata->comp_algo)) {
1109         case HAMMER2_COMP_NONE:
1110                 /*
1111                  * We have to assign physical storage to the buffer
1112                  * we intend to dirty or write now to avoid deadlocks
1113                  * in the strategy code later.
1114                  *
1115                  * This can return NOOFFSET for inode-embedded data.
1116                  * The strategy code will take care of it in that case.
1117                  */
1118                 cluster = hammer2_assign_physical(trans, ip, cparent,
1119                                                 lbase, pblksize,
1120                                                 errorp);
1121                 hammer2_write_bp(cluster, bp, ioflag, pblksize, errorp);
1122                 if (cluster)
1123                         hammer2_cluster_unlock(cluster);
1124                 break;
1125         case HAMMER2_COMP_AUTOZERO:
1126                 /*
1127                  * Check for zero-fill only
1128                  */
1129                 hammer2_zero_check_and_write(bp, trans, ip,
1130                                     ipdata, cparent, lbase,
1131                                     ioflag, pblksize, errorp);
1132                 break;
1133         case HAMMER2_COMP_LZ4:
1134         case HAMMER2_COMP_ZLIB:
1135         default:
1136                 /*
1137                  * Check for zero-fill and attempt compression.
1138                  */
1139                 hammer2_compress_and_write(bp, trans, ip,
1140                                            ipdata, cparent,
1141                                            lbase, ioflag,
1142                                            pblksize, errorp,
1143                                            ipdata->comp_algo);
1144                 break;
1145         }
1146 }
1147
1148 /*
1149  * Generic function that will perform the compression in compression
1150  * write path. The compression algorithm is determined by the settings
1151  * obtained from inode.
1152  */
1153 static
1154 void
1155 hammer2_compress_and_write(struct buf *bp, hammer2_trans_t *trans,
1156         hammer2_inode_t *ip, const hammer2_inode_data_t *ipdata,
1157         hammer2_cluster_t *cparent,
1158         hammer2_key_t lbase, int ioflag, int pblksize,
1159         int *errorp, int comp_algo)
1160 {
1161         hammer2_cluster_t *cluster;
1162         hammer2_chain_t *chain;
1163         int comp_size;
1164         int comp_block_size;
1165         int i;
1166         char *comp_buffer;
1167
1168         if (test_block_zeros(bp->b_data, pblksize)) {
1169                 zero_write(bp, trans, ip, ipdata, cparent, lbase, errorp);
1170                 return;
1171         }
1172
1173         comp_size = 0;
1174         comp_buffer = NULL;
1175
1176         KKASSERT(pblksize / 2 <= 32768);
1177
1178         if (ip->comp_heuristic < 8 || (ip->comp_heuristic & 7) == 0) {
1179                 z_stream strm_compress;
1180                 int comp_level;
1181                 int ret;
1182
1183                 switch(HAMMER2_DEC_COMP(comp_algo)) {
1184                 case HAMMER2_COMP_LZ4:
1185                         comp_buffer = objcache_get(cache_buffer_write,
1186                                                    M_INTWAIT);
1187                         comp_size = LZ4_compress_limitedOutput(
1188                                         bp->b_data,
1189                                         &comp_buffer[sizeof(int)],
1190                                         pblksize,
1191                                         pblksize / 2 - sizeof(int));
1192                         /*
1193                          * We need to prefix with the size, LZ4
1194                          * doesn't do it for us.  Add the related
1195                          * overhead.
1196                          */
1197                         *(int *)comp_buffer = comp_size;
1198                         if (comp_size)
1199                                 comp_size += sizeof(int);
1200                         break;
1201                 case HAMMER2_COMP_ZLIB:
1202                         comp_level = HAMMER2_DEC_LEVEL(comp_algo);
1203                         if (comp_level == 0)
1204                                 comp_level = 6; /* default zlib compression */
1205                         else if (comp_level < 6)
1206                                 comp_level = 6;
1207                         else if (comp_level > 9)
1208                                 comp_level = 9;
1209                         ret = deflateInit(&strm_compress, comp_level);
1210                         if (ret != Z_OK) {
1211                                 kprintf("HAMMER2 ZLIB: fatal error "
1212                                         "on deflateInit.\n");
1213                         }
1214
1215                         comp_buffer = objcache_get(cache_buffer_write,
1216                                                    M_INTWAIT);
1217                         strm_compress.next_in = bp->b_data;
1218                         strm_compress.avail_in = pblksize;
1219                         strm_compress.next_out = comp_buffer;
1220                         strm_compress.avail_out = pblksize / 2;
1221                         ret = deflate(&strm_compress, Z_FINISH);
1222                         if (ret == Z_STREAM_END) {
1223                                 comp_size = pblksize / 2 -
1224                                             strm_compress.avail_out;
1225                         } else {
1226                                 comp_size = 0;
1227                         }
1228                         ret = deflateEnd(&strm_compress);
1229                         break;
1230                 default:
1231                         kprintf("Error: Unknown compression method.\n");
1232                         kprintf("Comp_method = %d.\n", comp_algo);
1233                         break;
1234                 }
1235         }
1236
1237         if (comp_size == 0) {
1238                 /*
1239                  * compression failed or turned off
1240                  */
1241                 comp_block_size = pblksize;     /* safety */
1242                 if (++ip->comp_heuristic > 128)
1243                         ip->comp_heuristic = 8;
1244         } else {
1245                 /*
1246                  * compression succeeded
1247                  */
1248                 ip->comp_heuristic = 0;
1249                 if (comp_size <= 1024) {
1250                         comp_block_size = 1024;
1251                 } else if (comp_size <= 2048) {
1252                         comp_block_size = 2048;
1253                 } else if (comp_size <= 4096) {
1254                         comp_block_size = 4096;
1255                 } else if (comp_size <= 8192) {
1256                         comp_block_size = 8192;
1257                 } else if (comp_size <= 16384) {
1258                         comp_block_size = 16384;
1259                 } else if (comp_size <= 32768) {
1260                         comp_block_size = 32768;
1261                 } else {
1262                         panic("hammer2: WRITE PATH: "
1263                               "Weird comp_size value.");
1264                         /* NOT REACHED */
1265                         comp_block_size = pblksize;
1266                 }
1267         }
1268
1269         cluster = hammer2_assign_physical(trans, ip, cparent,
1270                                           lbase, comp_block_size,
1271                                           errorp);
1272         ipdata = &hammer2_cluster_data(cparent)->ipdata;
1273
1274         if (*errorp) {
1275                 kprintf("WRITE PATH: An error occurred while "
1276                         "assigning physical space.\n");
1277                 KKASSERT(cluster == NULL);
1278                 goto done;
1279         }
1280
1281         for (i = 0; i < cluster->nchains; ++i) {
1282                 hammer2_io_t *dio;
1283                 char *bdata;
1284                 int temp_check;
1285
1286                 chain = cluster->array[i];
1287                 KKASSERT(chain->flags & HAMMER2_CHAIN_MODIFIED);
1288
1289                 switch(chain->bref.type) {
1290                 case HAMMER2_BREF_TYPE_INODE:
1291                         KKASSERT(chain->data->ipdata.op_flags &
1292                                  HAMMER2_OPFLAG_DIRECTDATA);
1293                         KKASSERT(bp->b_loffset == 0);
1294                         bcopy(bp->b_data, chain->data->ipdata.u.data,
1295                               HAMMER2_EMBEDDED_BYTES);
1296                         break;
1297                 case HAMMER2_BREF_TYPE_DATA:
1298                         temp_check = HAMMER2_DEC_CHECK(chain->bref.methods);
1299
1300                         /*
1301                          * Optimize out the read-before-write
1302                          * if possible.
1303                          */
1304                         *errorp = hammer2_io_newnz(chain->hmp,
1305                                                    chain->bref.data_off,
1306                                                    chain->bytes,
1307                                                    &dio);
1308                         if (*errorp) {
1309                                 hammer2_io_brelse(&dio);
1310                                 kprintf("hammer2: WRITE PATH: "
1311                                         "dbp bread error\n");
1312                                 break;
1313                         }
1314                         bdata = hammer2_io_data(dio, chain->bref.data_off);
1315
1316                         /*
1317                          * When loading the block make sure we don't
1318                          * leave garbage after the compressed data.
1319                          */
1320                         if (comp_size) {
1321                                 chain->bref.methods =
1322                                         HAMMER2_ENC_COMP(comp_algo) +
1323                                         HAMMER2_ENC_CHECK(temp_check);
1324                                 bcopy(comp_buffer, bdata, comp_size);
1325                                 if (comp_size != comp_block_size) {
1326                                         bzero(bdata + comp_size,
1327                                               comp_block_size - comp_size);
1328                                 }
1329                         } else {
1330                                 chain->bref.methods =
1331                                         HAMMER2_ENC_COMP(
1332                                                 HAMMER2_COMP_NONE) +
1333                                         HAMMER2_ENC_CHECK(temp_check);
1334                                 bcopy(bp->b_data, bdata, pblksize);
1335                         }
1336
1337                         /*
1338                          * Device buffer is now valid, chain is no longer in
1339                          * the initial state.
1340                          *
1341                          * (No blockref table worries with file data)
1342                          */
1343                         atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL);
1344
1345                         /* Now write the related bdp. */
1346                         if (ioflag & IO_SYNC) {
1347                                 /*
1348                                  * Synchronous I/O requested.
1349                                  */
1350                                 hammer2_io_bwrite(&dio);
1351                         /*
1352                         } else if ((ioflag & IO_DIRECT) &&
1353                                    loff + n == pblksize) {
1354                                 hammer2_io_bdwrite(&dio);
1355                         */
1356                         } else if (ioflag & IO_ASYNC) {
1357                                 hammer2_io_bawrite(&dio);
1358                         } else {
1359                                 hammer2_io_bdwrite(&dio);
1360                         }
1361                         break;
1362                 default:
1363                         panic("hammer2_write_bp: bad chain type %d\n",
1364                                 chain->bref.type);
1365                         /* NOT REACHED */
1366                         break;
1367                 }
1368         }
1369 done:
1370         if (cluster)
1371                 hammer2_cluster_unlock(cluster);
1372         if (comp_buffer)
1373                 objcache_put(cache_buffer_write, comp_buffer);
1374 }
1375
1376 /*
1377  * Function that performs zero-checking and writing without compression,
1378  * it corresponds to default zero-checking path.
1379  */
1380 static
1381 void
1382 hammer2_zero_check_and_write(struct buf *bp, hammer2_trans_t *trans,
1383         hammer2_inode_t *ip, const hammer2_inode_data_t *ipdata,
1384         hammer2_cluster_t *cparent,
1385         hammer2_key_t lbase, int ioflag, int pblksize, int *errorp)
1386 {
1387         hammer2_cluster_t *cluster;
1388
1389         if (test_block_zeros(bp->b_data, pblksize)) {
1390                 zero_write(bp, trans, ip, ipdata, cparent, lbase, errorp);
1391         } else {
1392                 cluster = hammer2_assign_physical(trans, ip, cparent,
1393                                                   lbase, pblksize, errorp);
1394                 hammer2_write_bp(cluster, bp, ioflag, pblksize, errorp);
1395                 if (cluster)
1396                         hammer2_cluster_unlock(cluster);
1397         }
1398 }
1399
1400 /*
1401  * A function to test whether a block of data contains only zeros,
1402  * returns TRUE (non-zero) if the block is all zeros.
1403  */
1404 static
1405 int
1406 test_block_zeros(const char *buf, size_t bytes)
1407 {
1408         size_t i;
1409
1410         for (i = 0; i < bytes; i += sizeof(long)) {
1411                 if (*(const long *)(buf + i) != 0)
1412                         return (0);
1413         }
1414         return (1);
1415 }
1416
1417 /*
1418  * Function to "write" a block that contains only zeros.
1419  */
1420 static
1421 void
1422 zero_write(struct buf *bp, hammer2_trans_t *trans,
1423            hammer2_inode_t *ip, const hammer2_inode_data_t *ipdata,
1424            hammer2_cluster_t *cparent,
1425            hammer2_key_t lbase, int *errorp __unused)
1426 {
1427         hammer2_cluster_t *cluster;
1428         hammer2_media_data_t *data;
1429         hammer2_key_t key_dummy;
1430         int ddflag;
1431
1432         cparent = hammer2_cluster_lookup_init(cparent, 0);
1433         cluster = hammer2_cluster_lookup(cparent, &key_dummy, lbase, lbase,
1434                                      HAMMER2_LOOKUP_NODATA, &ddflag);
1435         if (cluster) {
1436                 data = hammer2_cluster_wdata(cluster);
1437
1438                 if (ddflag) {
1439                         KKASSERT(cluster->focus->flags &
1440                                  HAMMER2_CHAIN_MODIFIED);
1441                         bzero(data->ipdata.u.data, HAMMER2_EMBEDDED_BYTES);
1442                         hammer2_cluster_modsync(cluster);
1443                 } else {
1444                         hammer2_cluster_delete(trans, cparent, cluster,
1445                                                HAMMER2_DELETE_PERMANENT);
1446                 }
1447                 hammer2_cluster_unlock(cluster);
1448         }
1449         hammer2_cluster_lookup_done(cparent);
1450 }
1451
1452 /*
1453  * Function to write the data as it is, without performing any sort of
1454  * compression. This function is used in path without compression and
1455  * default zero-checking path.
1456  */
1457 static
1458 void
1459 hammer2_write_bp(hammer2_cluster_t *cluster, struct buf *bp, int ioflag,
1460                                 int pblksize, int *errorp)
1461 {
1462         hammer2_chain_t *chain;
1463         hammer2_io_t *dio;
1464         char *bdata;
1465         int error;
1466         int i;
1467         int temp_check;
1468
1469         error = 0;      /* XXX TODO below */
1470
1471         for (i = 0; i < cluster->nchains; ++i) {
1472                 chain = cluster->array[i];
1473
1474                 temp_check = HAMMER2_DEC_CHECK(chain->bref.methods);
1475
1476                 KKASSERT(chain->flags & HAMMER2_CHAIN_MODIFIED);
1477
1478                 switch(chain->bref.type) {
1479                 case HAMMER2_BREF_TYPE_INODE:
1480                         KKASSERT(chain->data->ipdata.op_flags &
1481                                  HAMMER2_OPFLAG_DIRECTDATA);
1482                         KKASSERT(bp->b_loffset == 0);
1483                         bcopy(bp->b_data, chain->data->ipdata.u.data,
1484                               HAMMER2_EMBEDDED_BYTES);
1485                         error = 0;
1486                         break;
1487                 case HAMMER2_BREF_TYPE_DATA:
1488                         error = hammer2_io_newnz(chain->hmp,
1489                                                  chain->bref.data_off,
1490                                                  chain->bytes, &dio);
1491                         if (error) {
1492                                 hammer2_io_bqrelse(&dio);
1493                                 kprintf("hammer2: WRITE PATH: "
1494                                         "dbp bread error\n");
1495                                 break;
1496                         }
1497                         bdata = hammer2_io_data(dio, chain->bref.data_off);
1498
1499                         chain->bref.methods = HAMMER2_ENC_COMP(
1500                                                         HAMMER2_COMP_NONE) +
1501                                               HAMMER2_ENC_CHECK(temp_check);
1502                         bcopy(bp->b_data, bdata, chain->bytes);
1503
1504                         /*
1505                          * Device buffer is now valid, chain is no longer in
1506                          * the initial state.
1507                          *
1508                          * (No blockref table worries with file data)
1509                          */
1510                         atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL);
1511
1512                         if (ioflag & IO_SYNC) {
1513                                 /*
1514                                  * Synchronous I/O requested.
1515                                  */
1516                                 hammer2_io_bwrite(&dio);
1517                         /*
1518                         } else if ((ioflag & IO_DIRECT) &&
1519                                    loff + n == pblksize) {
1520                                 hammer2_io_bdwrite(&dio);
1521                         */
1522                         } else if (ioflag & IO_ASYNC) {
1523                                 hammer2_io_bawrite(&dio);
1524                         } else {
1525                                 hammer2_io_bdwrite(&dio);
1526                         }
1527                         break;
1528                 default:
1529                         panic("hammer2_write_bp: bad chain type %d\n",
1530                               chain->bref.type);
1531                         /* NOT REACHED */
1532                         error = 0;
1533                         break;
1534                 }
1535                 KKASSERT(error == 0);   /* XXX TODO */
1536         }
1537         *errorp = error;
1538 }
1539
1540 static
1541 int
1542 hammer2_remount(hammer2_mount_t *hmp, struct mount *mp, char *path,
1543                 struct vnode *devvp, struct ucred *cred)
1544 {
1545         int error;
1546
1547         if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
1548                 error = hammer2_recovery(hmp);
1549         } else {
1550                 error = 0;
1551         }
1552         return error;
1553 }
1554
1555 static
1556 int
1557 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1558 {
1559         hammer2_pfsmount_t *pmp;
1560         hammer2_mount_t *hmp;
1561         hammer2_chain_t *rchain;
1562         hammer2_cluster_t *cluster;
1563         int flags;
1564         int error = 0;
1565         int i;
1566
1567         pmp = MPTOPMP(mp);
1568
1569         if (pmp == NULL)
1570                 return(0);
1571
1572         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1573         TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry);
1574
1575         /*
1576          * If mount initialization proceeded far enough we must flush
1577          * its vnodes.
1578          */
1579         if (mntflags & MNT_FORCE)
1580                 flags = FORCECLOSE;
1581         else
1582                 flags = 0;
1583         if (pmp->iroot) {
1584                 error = vflush(mp, 0, flags);
1585                 if (error)
1586                         goto failed;
1587         }
1588
1589         ccms_domain_uninit(&pmp->ccms_dom);
1590
1591         if (pmp->wthread_td) {
1592                 mtx_lock(&pmp->wthread_mtx);
1593                 pmp->wthread_destroy = 1;
1594                 wakeup(&pmp->wthread_bioq);
1595                 while (pmp->wthread_destroy != -1) {
1596                         mtxsleep(&pmp->wthread_destroy,
1597                                 &pmp->wthread_mtx, 0,
1598                                 "umount-sleep", 0);
1599                 }
1600                 mtx_unlock(&pmp->wthread_mtx);
1601                 pmp->wthread_td = NULL;
1602         }
1603
1604         /*
1605          * Cleanup our reference on ihidden.
1606          */
1607         if (pmp->ihidden) {
1608                 hammer2_inode_drop(pmp->ihidden);
1609                 pmp->ihidden = NULL;
1610         }
1611
1612         /*
1613          * Cleanup our reference on iroot.  iroot is (should) not be needed
1614          * by the flush code.
1615          */
1616         if (pmp->iroot) {
1617                 cluster = &pmp->iroot->cluster;
1618                 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1619                         rchain = pmp->iroot->cluster.array[i];
1620                         if (rchain == NULL)
1621                                 continue;
1622                         hmp = rchain->hmp;
1623                         hammer2_vfs_unmount_hmp1(mp, hmp);
1624
1625                         atomic_clear_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
1626 #if REPORT_REFS_ERRORS
1627                         if (rchain->refs != 1)
1628                                 kprintf("PMP->RCHAIN %p REFS WRONG %d\n",
1629                                         rchain, rchain->refs);
1630 #else
1631                         KKASSERT(rchain->refs == 1);
1632 #endif
1633                         hammer2_chain_drop(rchain);
1634                         cluster->array[i] = NULL;
1635                         hammer2_vfs_unmount_hmp2(mp, hmp);
1636                 }
1637                 cluster->focus = NULL;
1638
1639 #if REPORT_REFS_ERRORS
1640                 if (pmp->iroot->refs != 1)
1641                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
1642                                 pmp->iroot, pmp->iroot->refs);
1643 #else
1644                 KKASSERT(pmp->iroot->refs == 1);
1645 #endif
1646                 /* ref for pmp->iroot */
1647                 hammer2_inode_drop(pmp->iroot);
1648                 pmp->iroot = NULL;
1649         }
1650
1651         pmp->mp = NULL;
1652         mp->mnt_data = NULL;
1653
1654         kmalloc_destroy(&pmp->mmsg);
1655         kmalloc_destroy(&pmp->minode);
1656
1657         kfree(pmp, M_HAMMER2);
1658         error = 0;
1659
1660 failed:
1661         lockmgr(&hammer2_mntlk, LK_RELEASE);
1662
1663         return (error);
1664 }
1665
1666 static
1667 void
1668 hammer2_vfs_unmount_hmp1(struct mount *mp, hammer2_mount_t *hmp)
1669 {
1670         hammer2_mount_exlock(hmp);
1671         --hmp->pmp_count;
1672
1673         kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
1674
1675         kdmsg_iocom_uninit(&hmp->iocom);        /* XXX chain depend deadlck? */
1676
1677         /*
1678          * Cycle the volume data lock as a safety (probably not needed any
1679          * more).  To ensure everything is out we need to flush at least
1680          * three times.  (1) The running of the unlinkq can dirty the
1681          * filesystem, (2) A normal flush can dirty the freemap, and
1682          * (3) ensure that the freemap is fully synchronized.
1683          *
1684          * The next mount's recovery scan can clean everything up but we want
1685          * to leave the filesystem in a 100% clean state on a normal unmount.
1686          */
1687         hammer2_voldata_lock(hmp);
1688         hammer2_voldata_unlock(hmp);
1689         if (mp->mnt_data) {
1690                 hammer2_vfs_sync(mp, MNT_WAIT);
1691                 hammer2_vfs_sync(mp, MNT_WAIT);
1692                 hammer2_vfs_sync(mp, MNT_WAIT);
1693         }
1694
1695         if (hmp->pmp_count == 0) {
1696                 if ((hmp->vchain.flags | hmp->fchain.flags) &
1697                     HAMMER2_CHAIN_FLUSH_MASK) {
1698                         kprintf("hammer2_unmount: chains left over "
1699                                 "after final sync\n");
1700                         kprintf("    vchain %08x\n", hmp->vchain.flags);
1701                         kprintf("    fchain %08x\n", hmp->fchain.flags);
1702
1703                         if (hammer2_debug & 0x0010)
1704                                 Debugger("entered debugger");
1705                 }
1706         }
1707 }
1708
1709 static
1710 void
1711 hammer2_vfs_unmount_hmp2(struct mount *mp, hammer2_mount_t *hmp)
1712 {
1713         hammer2_pfsmount_t *spmp;
1714         struct vnode *devvp;
1715         int dumpcnt;
1716         int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
1717
1718         /*
1719          * If no PFS's left drop the master hammer2_mount for the
1720          * device.
1721          */
1722         if (hmp->pmp_count == 0) {
1723                 /*
1724                  * Clean up SPMP and the super-root inode
1725                  */
1726                 spmp = hmp->spmp;
1727                 if (spmp) {
1728                         if (spmp->iroot) {
1729                                 hammer2_inode_drop(spmp->iroot);
1730                                 spmp->iroot = NULL;
1731                         }
1732                         hmp->spmp = NULL;
1733                         kmalloc_destroy(&spmp->mmsg);
1734                         kmalloc_destroy(&spmp->minode);
1735                         kfree(spmp, M_HAMMER2);
1736                 }
1737
1738                 /*
1739                  * Finish up with the device vnode
1740                  */
1741                 if ((devvp = hmp->devvp) != NULL) {
1742                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1743                         vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1744                         hmp->devvp = NULL;
1745                         VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL);
1746                         vn_unlock(devvp);
1747                         vrele(devvp);
1748                         devvp = NULL;
1749                 }
1750
1751                 /*
1752                  * Clear vchain/fchain flags that might prevent final cleanup
1753                  * of these chains.
1754                  */
1755                 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) {
1756                         atomic_clear_int(&hmp->vchain.flags,
1757                                          HAMMER2_CHAIN_MODIFIED);
1758                         hammer2_pfs_memory_wakeup(hmp->vchain.pmp);
1759                         hammer2_chain_drop(&hmp->vchain);
1760                 }
1761                 if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) {
1762                         atomic_clear_int(&hmp->vchain.flags,
1763                                          HAMMER2_CHAIN_UPDATE);
1764                         hammer2_chain_drop(&hmp->vchain);
1765                 }
1766
1767                 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) {
1768                         atomic_clear_int(&hmp->fchain.flags,
1769                                          HAMMER2_CHAIN_MODIFIED);
1770                         hammer2_pfs_memory_wakeup(hmp->fchain.pmp);
1771                         hammer2_chain_drop(&hmp->fchain);
1772                 }
1773                 if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) {
1774                         atomic_clear_int(&hmp->fchain.flags,
1775                                          HAMMER2_CHAIN_UPDATE);
1776                         hammer2_chain_drop(&hmp->fchain);
1777                 }
1778
1779                 /*
1780                  * Final drop of embedded freemap root chain to
1781                  * clean up fchain.core (fchain structure is not
1782                  * flagged ALLOCATED so it is cleaned out and then
1783                  * left to rot).
1784                  */
1785                 hammer2_chain_drop(&hmp->fchain);
1786
1787                 /*
1788                  * Final drop of embedded volume root chain to clean
1789                  * up vchain.core (vchain structure is not flagged
1790                  * ALLOCATED so it is cleaned out and then left to
1791                  * rot).
1792                  */
1793                 dumpcnt = 50;
1794                 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v');
1795                 dumpcnt = 50;
1796                 hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f');
1797                 hammer2_mount_unlock(hmp);
1798                 hammer2_chain_drop(&hmp->vchain);
1799
1800                 hammer2_io_cleanup(hmp, &hmp->iotree);
1801                 if (hmp->iofree_count) {
1802                         kprintf("io_cleanup: %d I/O's left hanging\n",
1803                                 hmp->iofree_count);
1804                 }
1805
1806                 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1807                 kmalloc_destroy(&hmp->mchain);
1808                 kfree(hmp, M_HAMMER2);
1809         } else {
1810                 hammer2_mount_unlock(hmp);
1811         }
1812 }
1813
1814 static
1815 int
1816 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1817              ino_t ino, struct vnode **vpp)
1818 {
1819         kprintf("hammer2_vget\n");
1820         return (EOPNOTSUPP);
1821 }
1822
1823 static
1824 int
1825 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1826 {
1827         hammer2_pfsmount_t *pmp;
1828         hammer2_cluster_t *cparent;
1829         int error;
1830         struct vnode *vp;
1831
1832         pmp = MPTOPMP(mp);
1833         if (pmp->iroot == NULL) {
1834                 *vpp = NULL;
1835                 error = EINVAL;
1836         } else {
1837                 cparent = hammer2_inode_lock_sh(pmp->iroot);
1838                 vp = hammer2_igetv(pmp->iroot, cparent, &error);
1839                 hammer2_inode_unlock_sh(pmp->iroot, cparent);
1840                 *vpp = vp;
1841                 if (vp == NULL)
1842                         kprintf("vnodefail\n");
1843         }
1844
1845         return (error);
1846 }
1847
1848 /*
1849  * Filesystem status
1850  *
1851  * XXX incorporate ipdata->inode_quota and data_quota
1852  */
1853 static
1854 int
1855 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1856 {
1857         hammer2_pfsmount_t *pmp;
1858         hammer2_mount_t *hmp;
1859
1860         pmp = MPTOPMP(mp);
1861         KKASSERT(pmp->iroot->cluster.nchains >= 1);
1862         hmp = pmp->iroot->cluster.focus->hmp;   /* XXX */
1863
1864         mp->mnt_stat.f_files = pmp->inode_count;
1865         mp->mnt_stat.f_ffree = 0;
1866         mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
1867         mp->mnt_stat.f_bfree =  hmp->voldata.allocator_free / HAMMER2_PBUFSIZE;
1868         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1869
1870         *sbp = mp->mnt_stat;
1871         return (0);
1872 }
1873
1874 static
1875 int
1876 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1877 {
1878         hammer2_pfsmount_t *pmp;
1879         hammer2_mount_t *hmp;
1880
1881         pmp = MPTOPMP(mp);
1882         KKASSERT(pmp->iroot->cluster.nchains >= 1);
1883         hmp = pmp->iroot->cluster.focus->hmp;   /* XXX */
1884
1885         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1886         mp->mnt_vstat.f_files = pmp->inode_count;
1887         mp->mnt_vstat.f_ffree = 0;
1888         mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
1889         mp->mnt_vstat.f_bfree =  hmp->voldata.allocator_free / HAMMER2_PBUFSIZE;
1890         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1891
1892         *sbp = mp->mnt_vstat;
1893         return (0);
1894 }
1895
1896 /*
1897  * Mount-time recovery (RW mounts)
1898  *
1899  * Updates to the free block table are allowed to lag flushes by one
1900  * transaction.  In case of a crash, then on a fresh mount we must do an
1901  * incremental scan of the last committed transaction id and make sure that
1902  * all related blocks have been marked allocated.
1903  *
1904  * The super-root topology and each PFS has its own transaction id domain,
1905  * so we must track PFS boundary transitions.
1906  */
1907 struct hammer2_recovery_elm {
1908         TAILQ_ENTRY(hammer2_recovery_elm) entry;
1909         hammer2_chain_t *chain;
1910         hammer2_tid_t sync_tid;
1911 };
1912
1913 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm);
1914
1915 struct hammer2_recovery_info {
1916         struct hammer2_recovery_list list;
1917         int     depth;
1918 };
1919
1920 static int hammer2_recovery_scan(hammer2_trans_t *trans, hammer2_mount_t *hmp,
1921                         hammer2_chain_t *parent,
1922                         struct hammer2_recovery_info *info,
1923                         hammer2_tid_t sync_tid);
1924
1925 #define HAMMER2_RECOVERY_MAXDEPTH       10
1926
1927 static
1928 int
1929 hammer2_recovery(hammer2_mount_t *hmp)
1930 {
1931         hammer2_trans_t trans;
1932         struct hammer2_recovery_info info;
1933         struct hammer2_recovery_elm *elm;
1934         hammer2_chain_t *parent;
1935         hammer2_tid_t sync_tid;
1936         int error;
1937         int cumulative_error = 0;
1938
1939         hammer2_trans_init(&trans, hmp->spmp, 0);
1940
1941         sync_tid = 0;
1942         TAILQ_INIT(&info.list);
1943         info.depth = 0;
1944         parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1945         cumulative_error = hammer2_recovery_scan(&trans, hmp, parent,
1946                                                  &info, sync_tid);
1947         hammer2_chain_lookup_done(parent);
1948
1949         while ((elm = TAILQ_FIRST(&info.list)) != NULL) {
1950                 TAILQ_REMOVE(&info.list, elm, entry);
1951                 parent = elm->chain;
1952                 sync_tid = elm->sync_tid;
1953                 kfree(elm, M_HAMMER2);
1954
1955                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS |
1956                                            HAMMER2_RESOLVE_NOREF);
1957                 error = hammer2_recovery_scan(&trans, hmp, parent,
1958                                               &info, sync_tid);
1959                 hammer2_chain_unlock(parent);
1960                 if (error)
1961                         cumulative_error = error;
1962         }
1963         hammer2_trans_done(&trans);
1964
1965         return cumulative_error;
1966 }
1967
1968 static
1969 int
1970 hammer2_recovery_scan(hammer2_trans_t *trans, hammer2_mount_t *hmp,
1971                       hammer2_chain_t *parent,
1972                       struct hammer2_recovery_info *info,
1973                       hammer2_tid_t sync_tid)
1974 {
1975         hammer2_chain_t *chain;
1976         int cache_index;
1977         int cumulative_error = 0;
1978         int pfs_boundary = 0;
1979         int error;
1980
1981         /*
1982          * Adjust freemap to ensure that the block(s) are marked allocated.
1983          */
1984         if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) {
1985                 hammer2_freemap_adjust(trans, hmp, &parent->bref,
1986                                        HAMMER2_FREEMAP_DORECOVER);
1987         }
1988
1989         /*
1990          * Check type for recursive scan
1991          */
1992         switch(parent->bref.type) {
1993         case HAMMER2_BREF_TYPE_VOLUME:
1994                 /* data already instantiated */
1995                 break;
1996         case HAMMER2_BREF_TYPE_INODE:
1997                 /*
1998                  * Must instantiate data for DIRECTDATA test and also
1999                  * for recursion.
2000                  */
2001                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2002                 if (parent->data->ipdata.op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
2003                         /* not applicable to recovery scan */
2004                         hammer2_chain_unlock(parent);
2005                         return 0;
2006                 }
2007                 if ((parent->data->ipdata.op_flags & HAMMER2_OPFLAG_PFSROOT) &&
2008                     info->depth != 0) {
2009                         pfs_boundary = 1;
2010                         sync_tid = parent->bref.mirror_tid - 1;
2011                 }
2012                 hammer2_chain_unlock(parent);
2013                 break;
2014         case HAMMER2_BREF_TYPE_INDIRECT:
2015                 /*
2016                  * Must instantiate data for recursion
2017                  */
2018                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2019                 hammer2_chain_unlock(parent);
2020                 break;
2021         case HAMMER2_BREF_TYPE_DATA:
2022         case HAMMER2_BREF_TYPE_FREEMAP:
2023         case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2024         case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
2025                 /* not applicable to recovery scan */
2026                 return 0;
2027                 break;
2028         default:
2029                 return EDOM;
2030         }
2031
2032         /*
2033          * Defer operation if depth limit reached or if we are crossing a
2034          * PFS boundary.
2035          */
2036         if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH || pfs_boundary) {
2037                 struct hammer2_recovery_elm *elm;
2038
2039                 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK);
2040                 elm->chain = parent;
2041                 elm->sync_tid = sync_tid;
2042                 hammer2_chain_ref(parent);
2043                 TAILQ_INSERT_TAIL(&info->list, elm, entry);
2044                 /* unlocked by caller */
2045
2046                 return(0);
2047         }
2048
2049
2050         /*
2051          * Recursive scan of the last flushed transaction only.  We are
2052          * doing this without pmp assignments so don't leave the chains
2053          * hanging around after we are done with them.
2054          */
2055         cache_index = 0;
2056         chain = hammer2_chain_scan(parent, NULL, &cache_index,
2057                                    HAMMER2_LOOKUP_NODATA);
2058         while (chain) {
2059                 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
2060                 if (chain->bref.mirror_tid >= sync_tid) {
2061                         ++info->depth;
2062                         error = hammer2_recovery_scan(trans, hmp, chain,
2063                                                       info, sync_tid);
2064                         --info->depth;
2065                         if (error)
2066                                 cumulative_error = error;
2067                 }
2068                 chain = hammer2_chain_scan(parent, chain, &cache_index,
2069                                            HAMMER2_LOOKUP_NODATA);
2070         }
2071
2072         return cumulative_error;
2073 }
2074
2075 /*
2076  * Sync the entire filesystem; this is called from the filesystem syncer
2077  * process periodically and whenever a user calls sync(1) on the hammer
2078  * mountpoint.
2079  *
2080  * Currently is actually called from the syncer! \o/
2081  *
2082  * This task will have to snapshot the state of the dirty inode chain.
2083  * From that, it will have to make sure all of the inodes on the dirty
2084  * chain have IO initiated. We make sure that io is initiated for the root
2085  * block.
2086  *
2087  * If waitfor is set, we wait for media to acknowledge the new rootblock.
2088  *
2089  * THINKS: side A vs side B, to have sync not stall all I/O?
2090  */
2091 int
2092 hammer2_vfs_sync(struct mount *mp, int waitfor)
2093 {
2094         struct hammer2_sync_info info;
2095         hammer2_inode_t *iroot;
2096         hammer2_chain_t *chain;
2097         hammer2_chain_t *parent;
2098         hammer2_pfsmount_t *pmp;
2099         hammer2_mount_t *hmp;
2100         int flags;
2101         int error;
2102         int total_error;
2103         int force_fchain;
2104         int i;
2105         int j;
2106
2107         pmp = MPTOPMP(mp);
2108         iroot = pmp->iroot;
2109         KKASSERT(iroot);
2110         KKASSERT(iroot->pmp == pmp);
2111
2112         /*
2113          * We can't acquire locks on existing vnodes while in a transaction
2114          * without risking a deadlock.  This assumes that vfsync() can be
2115          * called without the vnode locked (which it can in DragonFly).
2116          * Otherwise we'd have to implement a multi-pass or flag the lock
2117          * failures and retry.
2118          *
2119          * The reclamation code interlocks with the sync list's token
2120          * (by removing the vnode from the scan list) before unlocking
2121          * the inode, giving us time to ref the inode.
2122          */
2123         /*flags = VMSC_GETVP;*/
2124         flags = 0;
2125         if (waitfor & MNT_LAZY)
2126                 flags |= VMSC_ONEPASS;
2127
2128         /*
2129          * Start our flush transaction.  This does not return until all
2130          * concurrent transactions have completed and will prevent any
2131          * new transactions from running concurrently, except for the
2132          * buffer cache transactions.
2133          *
2134          * For efficiency do an async pass before making sure with a
2135          * synchronous pass on all related buffer cache buffers.  It
2136          * should theoretically not be possible for any new file buffers
2137          * to be instantiated during this sequence.
2138          */
2139         hammer2_trans_init(&info.trans, pmp, HAMMER2_TRANS_ISFLUSH |
2140                                              HAMMER2_TRANS_PREFLUSH);
2141         hammer2_run_unlinkq(&info.trans, pmp);
2142
2143         info.error = 0;
2144         info.waitfor = MNT_NOWAIT;
2145         vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2146         info.waitfor = MNT_WAIT;
2147         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2148
2149         /*
2150          * Clear PREFLUSH.  This prevents (or asserts on) any new logical
2151          * buffer cache flushes which occur during the flush.  Device buffers
2152          * are not affected.
2153          */
2154
2155 #if 0
2156         if (info.error == 0 && (waitfor & MNT_WAIT)) {
2157                 info.waitfor = waitfor;
2158                     vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2159
2160         }
2161 #endif
2162         hammer2_bioq_sync(info.trans.pmp);
2163         atomic_clear_int(&info.trans.flags, HAMMER2_TRANS_PREFLUSH);
2164
2165         total_error = 0;
2166
2167         /*
2168          * Flush all storage elements making up the cluster
2169          *
2170          * We must also flush any deleted siblings because the super-root
2171          * flush won't do it for us.  They all must be staged or the
2172          * super-root flush will not be able to update its block table
2173          * properly.
2174          *
2175          * XXX currently done serially instead of concurrently
2176          */
2177         for (i = 0; iroot && i < iroot->cluster.nchains; ++i) {
2178                 chain = iroot->cluster.array[i];
2179                 if (chain) {
2180                         hammer2_chain_lock(chain, HAMMER2_RESOLVE_ALWAYS);
2181                         hammer2_flush(&info.trans, chain);
2182                         hammer2_chain_unlock(chain);
2183                 }
2184         }
2185 #if 0
2186         hammer2_trans_done(&info.trans);
2187 #endif
2188
2189         /*
2190          * Flush all volume roots to synchronize PFS flushes with the
2191          * storage media.  Use a super-root transaction for each one.
2192          *
2193          * The flush code will detect super-root -> pfs-root chain
2194          * transitions using the last pfs-root flush.
2195          */
2196         for (i = 0; iroot && i < iroot->cluster.nchains; ++i) {
2197                 chain = iroot->cluster.array[i];
2198                 if (chain == NULL)
2199                         continue;
2200
2201                 hmp = chain->hmp;
2202
2203                 /*
2204                  * We only have to flush each hmp once
2205                  */
2206                 for (j = i - 1; j >= 0; --j) {
2207                         if (iroot->cluster.array[j] &&
2208                             iroot->cluster.array[j]->hmp == hmp)
2209                                 break;
2210                 }
2211                 if (j >= 0)
2212                         continue;
2213                 hammer2_trans_spmp(&info.trans, hmp->spmp);
2214
2215                 /*
2216                  * Force an update of the XID from the PFS root to the
2217                  * topology root.  We couldn't do this from the PFS
2218                  * transaction because a SPMP transaction is needed.
2219                  * This does not modify blocks, instead what it does is
2220                  * allow the flush code to find the transition point and
2221                  * then update on the way back up.
2222                  */
2223                 parent = chain->parent;
2224                 KKASSERT(chain->pmp != parent->pmp);
2225                 hammer2_chain_setflush(&info.trans, parent);
2226
2227                 /*
2228                  * Media mounts have two 'roots', vchain for the topology
2229                  * and fchain for the free block table.  Flush both.
2230                  *
2231                  * Note that the topology and free block table are handled
2232                  * independently, so the free block table can wind up being
2233                  * ahead of the topology.  We depend on the bulk free scan
2234                  * code to deal with any loose ends.
2235                  */
2236                 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
2237                 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
2238                 if (hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
2239                         /*
2240                          * This will also modify vchain as a side effect,
2241                          * mark vchain as modified now.
2242                          */
2243                         hammer2_voldata_modify(hmp);
2244                         chain = &hmp->fchain;
2245                         hammer2_flush(&info.trans, chain);
2246                         KKASSERT(chain == &hmp->fchain);
2247                 }
2248                 hammer2_chain_unlock(&hmp->fchain);
2249                 hammer2_chain_unlock(&hmp->vchain);
2250
2251                 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
2252                 if (hmp->vchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
2253                         chain = &hmp->vchain;
2254                         hammer2_flush(&info.trans, chain);
2255                         KKASSERT(chain == &hmp->vchain);
2256                         force_fchain = 1;
2257                 } else {
2258                         force_fchain = 0;
2259                 }
2260                 hammer2_chain_unlock(&hmp->vchain);
2261
2262 #if 0
2263                 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
2264                 if ((hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_MASK) ||
2265                     force_fchain) {
2266                         /* this will also modify vchain as a side effect */
2267                         chain = &hmp->fchain;
2268                         hammer2_flush(&info.trans, chain);
2269                         KKASSERT(chain == &hmp->fchain);
2270                 }
2271                 hammer2_chain_unlock(&hmp->fchain);
2272 #endif
2273
2274                 error = 0;
2275
2276                 /*
2277                  * We can't safely flush the volume header until we have
2278                  * flushed any device buffers which have built up.
2279                  *
2280                  * XXX this isn't being incremental
2281                  */
2282                 vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
2283                 error = VOP_FSYNC(hmp->devvp, MNT_WAIT, 0);
2284                 vn_unlock(hmp->devvp);
2285
2286                 /*
2287                  * The flush code sets CHAIN_VOLUMESYNC to indicate that the
2288                  * volume header needs synchronization via hmp->volsync.
2289                  *
2290                  * XXX synchronize the flag & data with only this flush XXX
2291                  */
2292                 if (error == 0 &&
2293                     (hmp->vchain.flags & HAMMER2_CHAIN_VOLUMESYNC)) {
2294                         struct buf *bp;
2295
2296                         /*
2297                          * Synchronize the disk before flushing the volume
2298                          * header.
2299                          */
2300                         bp = getpbuf(NULL);
2301                         bp->b_bio1.bio_offset = 0;
2302                         bp->b_bufsize = 0;
2303                         bp->b_bcount = 0;
2304                         bp->b_cmd = BUF_CMD_FLUSH;
2305                         bp->b_bio1.bio_done = biodone_sync;
2306                         bp->b_bio1.bio_flags |= BIO_SYNC;
2307                         vn_strategy(hmp->devvp, &bp->b_bio1);
2308                         biowait(&bp->b_bio1, "h2vol");
2309                         relpbuf(bp, NULL);
2310
2311                         /*
2312                          * Then we can safely flush the version of the
2313                          * volume header synchronized by the flush code.
2314                          */
2315                         i = hmp->volhdrno + 1;
2316                         if (i >= HAMMER2_NUM_VOLHDRS)
2317                                 i = 0;
2318                         if (i * HAMMER2_ZONE_BYTES64 + HAMMER2_SEGSIZE >
2319                             hmp->volsync.volu_size) {
2320                                 i = 0;
2321                         }
2322                         kprintf("sync volhdr %d %jd\n",
2323                                 i, (intmax_t)hmp->volsync.volu_size);
2324                         bp = getblk(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2325                                     HAMMER2_PBUFSIZE, 0, 0);
2326                         atomic_clear_int(&hmp->vchain.flags,
2327                                          HAMMER2_CHAIN_VOLUMESYNC);
2328                         bcopy(&hmp->volsync, bp->b_data, HAMMER2_PBUFSIZE);
2329                         bawrite(bp);
2330                         hmp->volhdrno = i;
2331                 }
2332                 if (error)
2333                         total_error = error;
2334
2335 #if 0
2336                 hammer2_trans_done(&info.trans);
2337 #endif
2338         }
2339         hammer2_trans_done(&info.trans);
2340
2341         return (total_error);
2342 }
2343
2344 /*
2345  * Sync passes.
2346  */
2347 static int
2348 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
2349 {
2350         struct hammer2_sync_info *info = data;
2351         hammer2_inode_t *ip;
2352         int error;
2353
2354         /*
2355          *
2356          */
2357         ip = VTOI(vp);
2358         if (ip == NULL)
2359                 return(0);
2360         if (vp->v_type == VNON || vp->v_type == VBAD) {
2361                 vclrisdirty(vp);
2362                 return(0);
2363         }
2364         if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
2365             RB_EMPTY(&vp->v_rbdirty_tree)) {
2366                 vclrisdirty(vp);
2367                 return(0);
2368         }
2369
2370         /*
2371          * VOP_FSYNC will start a new transaction so replicate some code
2372          * here to do it inline (see hammer2_vop_fsync()).
2373          *
2374          * WARNING: The vfsync interacts with the buffer cache and might
2375          *          block, we can't hold the inode lock at that time.
2376          *          However, we MUST ref ip before blocking to ensure that
2377          *          it isn't ripped out from under us (since we do not
2378          *          hold a lock on the vnode).
2379          */
2380         hammer2_inode_ref(ip);
2381         atomic_clear_int(&ip->flags, HAMMER2_INODE_MODIFIED);
2382         if (vp)
2383                 vfsync(vp, MNT_NOWAIT, 1, NULL, NULL);
2384
2385         hammer2_inode_drop(ip);
2386 #if 1
2387         error = 0;
2388         if (error)
2389                 info->error = error;
2390 #endif
2391         return(0);
2392 }
2393
2394 static
2395 int
2396 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
2397 {
2398         return (0);
2399 }
2400
2401 static
2402 int
2403 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
2404                struct fid *fhp, struct vnode **vpp)
2405 {
2406         return (0);
2407 }
2408
2409 static
2410 int
2411 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
2412                  int *exflagsp, struct ucred **credanonp)
2413 {
2414         return (0);
2415 }
2416
2417 /*
2418  * Support code for hammer2_mount().  Read, verify, and install the volume
2419  * header into the HMP
2420  *
2421  * XXX read four volhdrs and use the one with the highest TID whos CRC
2422  *     matches.
2423  *
2424  * XXX check iCRCs.
2425  *
2426  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
2427  *     nonexistant locations.
2428  *
2429  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
2430  */
2431 static
2432 int
2433 hammer2_install_volume_header(hammer2_mount_t *hmp)
2434 {
2435         hammer2_volume_data_t *vd;
2436         struct buf *bp;
2437         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
2438         int error_reported;
2439         int error;
2440         int valid;
2441         int i;
2442
2443         error_reported = 0;
2444         error = 0;
2445         valid = 0;
2446         bp = NULL;
2447
2448         /*
2449          * There are up to 4 copies of the volume header (syncs iterate
2450          * between them so there is no single master).  We don't trust the
2451          * volu_size field so we don't know precisely how large the filesystem
2452          * is, so depend on the OS to return an error if we go beyond the
2453          * block device's EOF.
2454          */
2455         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
2456                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2457                               HAMMER2_VOLUME_BYTES, &bp);
2458                 if (error) {
2459                         brelse(bp);
2460                         bp = NULL;
2461                         continue;
2462                 }
2463
2464                 vd = (struct hammer2_volume_data *) bp->b_data;
2465                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
2466                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
2467                         brelse(bp);
2468                         bp = NULL;
2469                         continue;
2470                 }
2471
2472                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
2473                         /* XXX: Reversed-endianness filesystem */
2474                         kprintf("hammer2: reverse-endian filesystem detected");
2475                         brelse(bp);
2476                         bp = NULL;
2477                         continue;
2478                 }
2479
2480                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
2481                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
2482                                       HAMMER2_VOLUME_ICRC0_SIZE);
2483                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
2484                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
2485                                        HAMMER2_VOLUME_ICRC1_SIZE);
2486                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
2487                         kprintf("hammer2 volume header crc "
2488                                 "mismatch copy #%d %08x/%08x\n",
2489                                 i, crc0, crc);
2490                         error_reported = 1;
2491                         brelse(bp);
2492                         bp = NULL;
2493                         continue;
2494                 }
2495                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
2496                         valid = 1;
2497                         hmp->voldata = *vd;
2498                         hmp->volhdrno = i;
2499                 }
2500                 brelse(bp);
2501                 bp = NULL;
2502         }
2503         if (valid) {
2504                 hmp->volsync = hmp->voldata;
2505                 error = 0;
2506                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
2507                         kprintf("hammer2: using volume header #%d\n",
2508                                 hmp->volhdrno);
2509                 }
2510         } else {
2511                 error = EINVAL;
2512                 kprintf("hammer2: no valid volume headers found!\n");
2513         }
2514         return (error);
2515 }
2516
2517 /*
2518  * Reconnect using the passed file pointer.  The caller must ref the
2519  * fp for us.
2520  */
2521 void
2522 hammer2_cluster_reconnect(hammer2_mount_t *hmp, struct file *fp)
2523 {
2524         size_t name_len;
2525         const char *name = "disk-volume";
2526
2527         /*
2528          * Closes old comm descriptor, kills threads, cleans up
2529          * states, then installs the new descriptor and creates
2530          * new threads.
2531          */
2532         kdmsg_iocom_reconnect(&hmp->iocom, fp, "hammer2");
2533
2534         /*
2535          * Setup LNK_CONN fields for autoinitiated state machine.  We
2536          * will use SPANs to advertise multiple PFSs so only pass the
2537          * fsid and HAMMER2_PFSTYPE_SUPROOT for the AUTOCONN.
2538          *
2539          * We are not initiating a LNK_SPAN so we do not have to set-up
2540          * iocom.auto_lnk_span.
2541          */
2542         bzero(&hmp->iocom.auto_lnk_conn.pfs_clid,
2543               sizeof(hmp->iocom.auto_lnk_conn.pfs_clid));
2544         hmp->iocom.auto_lnk_conn.pfs_fsid = hmp->voldata.fsid;
2545         hmp->iocom.auto_lnk_conn.pfs_type = HAMMER2_PFSTYPE_SUPROOT;
2546         hmp->iocom.auto_lnk_conn.proto_version = DMSG_SPAN_PROTO_1;
2547 #if 0
2548         hmp->iocom.auto_lnk_conn.peer_type = hmp->voldata.peer_type;
2549 #endif
2550         hmp->iocom.auto_lnk_conn.peer_type = DMSG_PEER_HAMMER2;
2551
2552         /*
2553          * Filter adjustment.  Clients do not need visibility into other
2554          * clients (otherwise millions of clients would present a serious
2555          * problem).  The fs_label also serves to restrict the namespace.
2556          */
2557         hmp->iocom.auto_lnk_conn.peer_mask = 1LLU << DMSG_PEER_HAMMER2;
2558         hmp->iocom.auto_lnk_conn.pfs_mask = (uint64_t)-1;
2559
2560 #if 0
2561         switch (ipdata->pfs_type) {
2562         case DMSG_PFSTYPE_CLIENT:
2563                 hmp->iocom.auto_lnk_conn.peer_mask &=
2564                                 ~(1LLU << DMSG_PFSTYPE_CLIENT);
2565                 break;
2566         default:
2567                 break;
2568         }
2569 #endif
2570
2571         name_len = strlen(name);
2572         if (name_len >= sizeof(hmp->iocom.auto_lnk_conn.fs_label))
2573                 name_len = sizeof(hmp->iocom.auto_lnk_conn.fs_label) - 1;
2574         bcopy(name, hmp->iocom.auto_lnk_conn.fs_label, name_len);
2575         hmp->iocom.auto_lnk_conn.fs_label[name_len] = 0;
2576
2577         kdmsg_iocom_autoinitiate(&hmp->iocom, hammer2_autodmsg);
2578 }
2579
2580 static int
2581 hammer2_rcvdmsg(kdmsg_msg_t *msg)
2582 {
2583         kprintf("RCVMSG %08x\n", msg->tcmd);
2584
2585         switch(msg->tcmd) {
2586         case DMSG_DBG_SHELL:
2587                 /*
2588                  * (non-transaction)
2589                  * Execute shell command (not supported atm)
2590                  */
2591                 kdmsg_msg_result(msg, DMSG_ERR_NOSUPP);
2592                 break;
2593         case DMSG_DBG_SHELL | DMSGF_REPLY:
2594                 /*
2595                  * (non-transaction)
2596                  */
2597                 if (msg->aux_data) {
2598                         msg->aux_data[msg->aux_size - 1] = 0;
2599                         kprintf("HAMMER2 DBG: %s\n", msg->aux_data);
2600                 }
2601                 break;
2602         default:
2603                 /*
2604                  * Unsupported message received.  We only need to
2605                  * reply if it's a transaction in order to close our end.
2606                  * Ignore any one-way messages or any further messages
2607                  * associated with the transaction.
2608                  *
2609                  * NOTE: This case also includes DMSG_LNK_ERROR messages
2610                  *       which might be one-way, replying to those would
2611                  *       cause an infinite ping-pong.
2612                  */
2613                 if (msg->any.head.cmd & DMSGF_CREATE)
2614                         kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
2615                 break;
2616         }
2617         return(0);
2618 }
2619
2620 /*
2621  * This function is called after KDMSG has automatically handled processing
2622  * of a LNK layer message (typically CONN, SPAN, or CIRC).
2623  *
2624  * We tag off the LNK_CONN to trigger our LNK_VOLCONF messages which
2625  * advertises all available hammer2 super-root volumes.
2626  */
2627 static void hammer2_update_spans(hammer2_mount_t *hmp, kdmsg_state_t *state);
2628
2629 static void
2630 hammer2_autodmsg(kdmsg_msg_t *msg)
2631 {
2632         hammer2_mount_t *hmp = msg->state->iocom->handle;
2633         int copyid;
2634
2635         kprintf("RCAMSG %08x\n", msg->tcmd);
2636
2637         switch(msg->tcmd) {
2638         case DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_REPLY:
2639         case DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_DELETE | DMSGF_REPLY:
2640                 if (msg->any.head.cmd & DMSGF_CREATE) {
2641                         kprintf("HAMMER2: VOLDATA DUMP\n");
2642
2643                         /*
2644                          * Dump the configuration stored in the volume header.
2645                          * This will typically be import/export access rights,
2646                          * master encryption keys (encrypted), etc.
2647                          */
2648                         hammer2_voldata_lock(hmp);
2649                         copyid = 0;
2650                         while (copyid < HAMMER2_COPYID_COUNT) {
2651                                 if (hmp->voldata.copyinfo[copyid].copyid)
2652                                         hammer2_volconf_update(hmp, copyid);
2653                                 ++copyid;
2654                         }
2655                         hammer2_voldata_unlock(hmp);
2656
2657                         kprintf("HAMMER2: INITIATE SPANs\n");
2658                         hammer2_update_spans(hmp, msg->state);
2659                 }
2660                 if ((msg->any.head.cmd & DMSGF_DELETE) &&
2661                     msg->state && (msg->state->txcmd & DMSGF_DELETE) == 0) {
2662                         kprintf("HAMMER2: CONN WAS TERMINATED\n");
2663                 }
2664                 break;
2665         default:
2666                 break;
2667         }
2668 }
2669
2670 /*
2671  * Update LNK_SPAN state
2672  */
2673 static void
2674 hammer2_update_spans(hammer2_mount_t *hmp, kdmsg_state_t *state)
2675 {
2676         const hammer2_inode_data_t *ipdata;
2677         hammer2_cluster_t *cparent;
2678         hammer2_cluster_t *cluster;
2679         hammer2_pfsmount_t *spmp;
2680         hammer2_key_t key_next;
2681         kdmsg_msg_t *rmsg;
2682         size_t name_len;
2683         int ddflag;
2684
2685         /*
2686          * Lookup mount point under the media-localized super-root.
2687          *
2688          * cluster->pmp will incorrectly point to spmp and must be fixed
2689          * up later on.
2690          */
2691         spmp = hmp->spmp;
2692         cparent = hammer2_inode_lock_ex(spmp->iroot);
2693         cluster = hammer2_cluster_lookup(cparent, &key_next,
2694                                          HAMMER2_KEY_MIN,
2695                                          HAMMER2_KEY_MAX,
2696                                          0, &ddflag);
2697         while (cluster) {
2698                 if (hammer2_cluster_type(cluster) != HAMMER2_BREF_TYPE_INODE)
2699                         continue;
2700                 ipdata = &hammer2_cluster_data(cluster)->ipdata;
2701                 kprintf("UPDATE SPANS: %s\n", ipdata->filename);
2702
2703                 rmsg = kdmsg_msg_alloc(state, DMSG_LNK_SPAN | DMSGF_CREATE,
2704                                        hammer2_lnk_span_reply, NULL);
2705                 rmsg->any.lnk_span.pfs_clid = ipdata->pfs_clid;
2706                 rmsg->any.lnk_span.pfs_fsid = ipdata->pfs_fsid;
2707                 rmsg->any.lnk_span.pfs_type = ipdata->pfs_type;
2708                 rmsg->any.lnk_span.peer_type = DMSG_PEER_HAMMER2;
2709                 rmsg->any.lnk_span.proto_version = DMSG_SPAN_PROTO_1;
2710                 name_len = ipdata->name_len;
2711                 if (name_len >= sizeof(rmsg->any.lnk_span.fs_label))
2712                         name_len = sizeof(rmsg->any.lnk_span.fs_label) - 1;
2713                 bcopy(ipdata->filename, rmsg->any.lnk_span.fs_label, name_len);
2714
2715                 kdmsg_msg_write(rmsg);
2716
2717                 cluster = hammer2_cluster_next(cparent, cluster,
2718                                                &key_next,
2719                                                key_next,
2720                                                HAMMER2_KEY_MAX,
2721                                                0);
2722         }
2723         hammer2_inode_unlock_ex(spmp->iroot, cparent);
2724 }
2725
2726 static
2727 int
2728 hammer2_lnk_span_reply(kdmsg_state_t *state, kdmsg_msg_t *msg)
2729 {
2730         if ((state->txcmd & DMSGF_DELETE) == 0 &&
2731             (msg->any.head.cmd & DMSGF_DELETE)) {
2732                 kdmsg_msg_reply(msg, 0);
2733         }
2734         return 0;
2735 }
2736
2737 /*
2738  * Volume configuration updates are passed onto the userland service
2739  * daemon via the open LNK_CONN transaction.
2740  */
2741 void
2742 hammer2_volconf_update(hammer2_mount_t *hmp, int index)
2743 {
2744         kdmsg_msg_t *msg;
2745
2746         /* XXX interlock against connection state termination */
2747         kprintf("volconf update %p\n", hmp->iocom.conn_state);
2748         if (hmp->iocom.conn_state) {
2749                 kprintf("TRANSMIT VOLCONF VIA OPEN CONN TRANSACTION\n");
2750                 msg = kdmsg_msg_alloc(hmp->iocom.conn_state,
2751                                       DMSG_LNK_HAMMER2_VOLCONF,
2752                                       NULL, NULL);
2753                 H2_LNK_VOLCONF(msg)->copy = hmp->voldata.copyinfo[index];
2754                 H2_LNK_VOLCONF(msg)->mediaid = hmp->voldata.fsid;
2755                 H2_LNK_VOLCONF(msg)->index = index;
2756                 kdmsg_msg_write(msg);
2757         }
2758 }
2759
2760 /*
2761  * This handles hysteresis on regular file flushes.  Because the BIOs are
2762  * routed to a thread it is possible for an excessive number to build up
2763  * and cause long front-end stalls long before the runningbuffspace limit
2764  * is hit, so we implement hammer2_flush_pipe to control the
2765  * hysteresis.
2766  *
2767  * This is a particular problem when compression is used.
2768  */
2769 void
2770 hammer2_lwinprog_ref(hammer2_pfsmount_t *pmp)
2771 {
2772         atomic_add_int(&pmp->count_lwinprog, 1);
2773 }
2774
2775 void
2776 hammer2_lwinprog_drop(hammer2_pfsmount_t *pmp)
2777 {
2778         int lwinprog;
2779
2780         lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1);
2781         if ((lwinprog & HAMMER2_LWINPROG_WAITING) &&
2782             (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) {
2783                 atomic_clear_int(&pmp->count_lwinprog,
2784                                  HAMMER2_LWINPROG_WAITING);
2785                 wakeup(&pmp->count_lwinprog);
2786         }
2787 }
2788
2789 void
2790 hammer2_lwinprog_wait(hammer2_pfsmount_t *pmp)
2791 {
2792         int lwinprog;
2793
2794         for (;;) {
2795                 lwinprog = pmp->count_lwinprog;
2796                 cpu_ccfence();
2797                 if ((lwinprog & HAMMER2_LWINPROG_MASK) < hammer2_flush_pipe)
2798                         break;
2799                 tsleep_interlock(&pmp->count_lwinprog, 0);
2800                 atomic_set_int(&pmp->count_lwinprog, HAMMER2_LWINPROG_WAITING);
2801                 lwinprog = pmp->count_lwinprog;
2802                 if ((lwinprog & HAMMER2_LWINPROG_MASK) < hammer2_flush_pipe)
2803                         break;
2804                 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz);
2805         }
2806 }
2807
2808 /*
2809  * Manage excessive memory resource use for chain and related
2810  * structures.
2811  */
2812 void
2813 hammer2_pfs_memory_wait(hammer2_pfsmount_t *pmp)
2814 {
2815         uint32_t waiting;
2816         uint32_t count;
2817         uint32_t limit;
2818 #if 0
2819         static int zzticks;
2820 #endif
2821
2822         /*
2823          * Atomic check condition and wait.  Also do an early speedup of
2824          * the syncer to try to avoid hitting the wait.
2825          */
2826         for (;;) {
2827                 waiting = pmp->inmem_dirty_chains;
2828                 cpu_ccfence();
2829                 count = waiting & HAMMER2_DIRTYCHAIN_MASK;
2830
2831                 limit = pmp->mp->mnt_nvnodelistsize / 10;
2832                 if (limit < hammer2_limit_dirty_chains)
2833                         limit = hammer2_limit_dirty_chains;
2834                 if (limit < 1000)
2835                         limit = 1000;
2836
2837 #if 0
2838                 if ((int)(ticks - zzticks) > hz) {
2839                         zzticks = ticks;
2840                         kprintf("count %ld %ld\n", count, limit);
2841                 }
2842 #endif
2843
2844                 /*
2845                  * Block if there are too many dirty chains present, wait
2846                  * for the flush to clean some out.
2847                  */
2848                 if (count > limit) {
2849                         tsleep_interlock(&pmp->inmem_dirty_chains, 0);
2850                         if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2851                                                waiting,
2852                                        waiting | HAMMER2_DIRTYCHAIN_WAITING)) {
2853                                 speedup_syncer(pmp->mp);
2854                                 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED,
2855                                        "chnmem", hz);
2856                         }
2857                         continue;       /* loop on success or fail */
2858                 }
2859
2860                 /*
2861                  * Try to start an early flush before we are forced to block.
2862                  */
2863                 if (count > limit * 7 / 10)
2864                         speedup_syncer(pmp->mp);
2865                 break;
2866         }
2867 }
2868
2869 void
2870 hammer2_pfs_memory_inc(hammer2_pfsmount_t *pmp)
2871 {
2872         if (pmp) {
2873                 atomic_add_int(&pmp->inmem_dirty_chains, 1);
2874         }
2875 }
2876
2877 void
2878 hammer2_pfs_memory_wakeup(hammer2_pfsmount_t *pmp)
2879 {
2880         uint32_t waiting;
2881
2882         if (pmp == NULL)
2883                 return;
2884
2885         for (;;) {
2886                 waiting = pmp->inmem_dirty_chains;
2887                 cpu_ccfence();
2888                 if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2889                                        waiting,
2890                                        (waiting - 1) &
2891                                         ~HAMMER2_DIRTYCHAIN_WAITING)) {
2892                         break;
2893                 }
2894         }
2895
2896         if (waiting & HAMMER2_DIRTYCHAIN_WAITING)
2897                 wakeup(&pmp->inmem_dirty_chains);
2898 }
2899
2900 /*
2901  * Debugging
2902  */
2903 void
2904 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx)
2905 {
2906         hammer2_chain_t *scan;
2907         hammer2_chain_t *parent;
2908
2909         --*countp;
2910         if (*countp == 0) {
2911                 kprintf("%*.*s...\n", tab, tab, "");
2912                 return;
2913         }
2914         if (*countp < 0)
2915                 return;
2916         kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n",
2917                 tab, tab, "", pfx,
2918                 chain, chain->bref.type,
2919                 chain->bref.key, chain->bref.keybits,
2920                 chain->bref.mirror_tid);
2921
2922         kprintf("%*.*s      [%08x] (%s) refs=%d\n",
2923                 tab, tab, "",
2924                 chain->flags,
2925                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
2926                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
2927                 chain->refs);
2928
2929         kprintf("%*.*s      core [%08x]",
2930                 tab, tab, "",
2931                 chain->core.flags);
2932
2933         parent = chain->parent;
2934         if (parent)
2935                 kprintf("\n%*.*s      p=%p [pflags %08x prefs %d",
2936                         tab, tab, "",
2937                         parent, parent->flags, parent->refs);
2938         if (RB_EMPTY(&chain->core.rbtree)) {
2939                 kprintf("\n");
2940         } else {
2941                 kprintf(" {\n");
2942                 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree)
2943                         hammer2_dump_chain(scan, tab + 4, countp, 'a');
2944                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
2945                         kprintf("%*.*s}(%s)\n", tab, tab, "",
2946                                 chain->data->ipdata.filename);
2947                 else
2948                         kprintf("%*.*s}\n", tab, tab, "");
2949         }
2950 }