sys/vfs/hammer2/hammer2_vfsops.c

   1 /*
   2  * Copyright (c) 2011-2014 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  * by Daniel Flores (GSOC 2013 - mentored by Matthew Dillon, compression)
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  * 3. Neither the name of The DragonFly Project nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific, prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  25  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  26  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  30  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  32  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/nlookup.h>
  39 #include <sys/vnode.h>
  40 #include <sys/mount.h>
  41 #include <sys/fcntl.h>
  42 #include <sys/buf.h>
  43 #include <sys/uuid.h>
  44 #include <sys/vfsops.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/socket.h>
  47 #include <sys/objcache.h>
  48
  49 #include <sys/proc.h>
  50 #include <sys/namei.h>
  51 #include <sys/mountctl.h>
  52 #include <sys/dirent.h>
  53 #include <sys/uio.h>
  54
  55 #include <sys/mutex.h>
  56 #include <sys/mutex2.h>
  57
  58 #include "hammer2.h"
  59 #include "hammer2_disk.h"
  60 #include "hammer2_mount.h"
  61
  62 #include "hammer2.h"
  63 #include "hammer2_lz4.h"
  64
  65 #include "zlib/hammer2_zlib.h"
  66
  67 #define REPORT_REFS_ERRORS 1    /* XXX remove me */
  68
  69 MALLOC_DEFINE(M_OBJCACHE, "objcache", "Object Cache");
  70
  71 struct hammer2_sync_info {
  72         hammer2_trans_t trans;
  73         int error;
  74         int waitfor;
  75 };
  76
  77 TAILQ_HEAD(hammer2_mntlist, hammer2_mount);
  78 TAILQ_HEAD(hammer2_pfslist, hammer2_pfsmount);
  79 static struct hammer2_mntlist hammer2_mntlist;
  80 static struct hammer2_pfslist hammer2_pfslist;
  81 static struct lock hammer2_mntlk;
  82
  83 int hammer2_debug;
  84 int hammer2_cluster_enable = 1;
  85 int hammer2_hardlink_enable = 1;
  86 int hammer2_flush_pipe = 100;
  87 int hammer2_synchronous_flush = 1;
  88 int hammer2_dio_count;
  89 long hammer2_limit_dirty_chains;
  90 long hammer2_iod_file_read;
  91 long hammer2_iod_meta_read;
  92 long hammer2_iod_indr_read;
  93 long hammer2_iod_fmap_read;
  94 long hammer2_iod_volu_read;
  95 long hammer2_iod_file_write;
  96 long hammer2_iod_meta_write;
  97 long hammer2_iod_indr_write;
  98 long hammer2_iod_fmap_write;
  99 long hammer2_iod_volu_write;
 100 long hammer2_ioa_file_read;
 101 long hammer2_ioa_meta_read;
 102 long hammer2_ioa_indr_read;
 103 long hammer2_ioa_fmap_read;
 104 long hammer2_ioa_volu_read;
 105 long hammer2_ioa_fmap_write;
 106 long hammer2_ioa_file_write;
 107 long hammer2_ioa_meta_write;
 108 long hammer2_ioa_indr_write;
 109 long hammer2_ioa_volu_write;
 110
 111 MALLOC_DECLARE(C_BUFFER);
 112 MALLOC_DEFINE(C_BUFFER, "compbuffer", "Buffer used for compression.");
 113
 114 MALLOC_DECLARE(D_BUFFER);
 115 MALLOC_DEFINE(D_BUFFER, "decompbuffer", "Buffer used for decompression.");
 116
 117 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
 118
 119 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
 120            &hammer2_debug, 0, "");
 121 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_enable, CTLFLAG_RW,
 122            &hammer2_cluster_enable, 0, "");
 123 SYSCTL_INT(_vfs_hammer2, OID_AUTO, hardlink_enable, CTLFLAG_RW,
 124            &hammer2_hardlink_enable, 0, "");
 125 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW,
 126            &hammer2_flush_pipe, 0, "");
 127 SYSCTL_INT(_vfs_hammer2, OID_AUTO, synchronous_flush, CTLFLAG_RW,
 128            &hammer2_synchronous_flush, 0, "");
 129 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW,
 130            &hammer2_limit_dirty_chains, 0, "");
 131 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD,
 132            &hammer2_dio_count, 0, "");
 133
 134 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
 135            &hammer2_iod_file_read, 0, "");
 136 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
 137            &hammer2_iod_meta_read, 0, "");
 138 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
 139            &hammer2_iod_indr_read, 0, "");
 140 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW,
 141            &hammer2_iod_fmap_read, 0, "");
 142 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW,
 143            &hammer2_iod_volu_read, 0, "");
 144
 145 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
 146            &hammer2_iod_file_write, 0, "");
 147 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
 148            &hammer2_iod_meta_write, 0, "");
 149 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
 150            &hammer2_iod_indr_write, 0, "");
 151 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW,
 152            &hammer2_iod_fmap_write, 0, "");
 153 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
 154            &hammer2_iod_volu_write, 0, "");
 155
 156 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_read, CTLFLAG_RW,
 157            &hammer2_ioa_file_read, 0, "");
 158 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_read, CTLFLAG_RW,
 159            &hammer2_ioa_meta_read, 0, "");
 160 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_read, CTLFLAG_RW,
 161            &hammer2_ioa_indr_read, 0, "");
 162 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_fmap_read, CTLFLAG_RW,
 163            &hammer2_ioa_fmap_read, 0, "");
 164 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_read, CTLFLAG_RW,
 165            &hammer2_ioa_volu_read, 0, "");
 166
 167 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_write, CTLFLAG_RW,
 168            &hammer2_ioa_file_write, 0, "");
 169 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_write, CTLFLAG_RW,
 170            &hammer2_ioa_meta_write, 0, "");
 171 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_write, CTLFLAG_RW,
 172            &hammer2_ioa_indr_write, 0, "");
 173 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_fmap_write, CTLFLAG_RW,
 174            &hammer2_ioa_fmap_write, 0, "");
 175 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_write, CTLFLAG_RW,
 176            &hammer2_ioa_volu_write, 0, "");
 177
 178 static int hammer2_vfs_init(struct vfsconf *conf);
 179 static int hammer2_vfs_uninit(struct vfsconf *vfsp);
 180 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 181                                 struct ucred *cred);
 182 static int hammer2_remount(hammer2_mount_t *, struct mount *, char *,
 183                                 struct vnode *, struct ucred *);
 184 static int hammer2_recovery(hammer2_mount_t *hmp);
 185 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
 186 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
 187 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
 188                                 struct ucred *cred);
 189 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 190                                 struct ucred *cred);
 191 static int hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 192                                 ino_t ino, struct vnode **vpp);
 193 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 194                                 struct fid *fhp, struct vnode **vpp);
 195 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 196 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 197                                 int *exflagsp, struct ucred **credanonp);
 198
 199 static int hammer2_install_volume_header(hammer2_mount_t *hmp);
 200 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
 201
 202 static void hammer2_write_thread(void *arg);
 203
 204 static void hammer2_vfs_unmount_hmp1(struct mount *mp, hammer2_mount_t *hmp);
 205 static void hammer2_vfs_unmount_hmp2(struct mount *mp, hammer2_mount_t *hmp);
 206
 207 /*
 208  * Functions for compression in threads,
 209  * from hammer2_vnops.c
 210  */
 211 static void hammer2_write_file_core(struct buf *bp, hammer2_trans_t *trans,
 212                                 hammer2_inode_t *ip,
 213                                 hammer2_inode_data_t *ipdata,
 214                                 hammer2_cluster_t *cparent,
 215                                 hammer2_key_t lbase, int ioflag, int pblksize,
 216                                 int *errorp);
 217 static void hammer2_compress_and_write(struct buf *bp, hammer2_trans_t *trans,
 218                                 hammer2_inode_t *ip,
 219                                 const hammer2_inode_data_t *ipdata,
 220                                 hammer2_cluster_t *cparent,
 221                                 hammer2_key_t lbase, int ioflag,
 222                                 int pblksize, int *errorp, int comp_algo);
 223 static void hammer2_zero_check_and_write(struct buf *bp,
 224                                 hammer2_trans_t *trans, hammer2_inode_t *ip,
 225                                 const hammer2_inode_data_t *ipdata,
 226                                 hammer2_cluster_t *cparent,
 227                                 hammer2_key_t lbase,
 228                                 int ioflag, int pblksize, int *errorp);
 229 static int test_block_zeros(const char *buf, size_t bytes);
 230 static void zero_write(struct buf *bp, hammer2_trans_t *trans,
 231                                 hammer2_inode_t *ip,
 232                                 const hammer2_inode_data_t *ipdata,
 233                                 hammer2_cluster_t *cparent,
 234                                 hammer2_key_t lbase,
 235                                 int *errorp);
 236 static void hammer2_write_bp(hammer2_cluster_t *cluster, struct buf *bp,
 237                                 int ioflag, int pblksize, int *errorp);
 238
 239 static int hammer2_rcvdmsg(kdmsg_msg_t *msg);
 240 static void hammer2_autodmsg(kdmsg_msg_t *msg);
 241 static int hammer2_lnk_span_reply(kdmsg_state_t *state, kdmsg_msg_t *msg);
 242
 243
 244 /*
 245  * HAMMER2 vfs operations.
 246  */
 247 static struct vfsops hammer2_vfsops = {
 248         .vfs_init       = hammer2_vfs_init,
 249         .vfs_uninit     = hammer2_vfs_uninit,
 250         .vfs_sync       = hammer2_vfs_sync,
 251         .vfs_mount      = hammer2_vfs_mount,
 252         .vfs_unmount    = hammer2_vfs_unmount,
 253         .vfs_root       = hammer2_vfs_root,
 254         .vfs_statfs     = hammer2_vfs_statfs,
 255         .vfs_statvfs    = hammer2_vfs_statvfs,
 256         .vfs_vget       = hammer2_vfs_vget,
 257         .vfs_vptofh     = hammer2_vfs_vptofh,
 258         .vfs_fhtovp     = hammer2_vfs_fhtovp,
 259         .vfs_checkexp   = hammer2_vfs_checkexp
 260 };
 261
 262 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
 263
 264 VFS_SET(hammer2_vfsops, hammer2, 0);
 265 MODULE_VERSION(hammer2, 1);
 266
 267 static
 268 int
 269 hammer2_vfs_init(struct vfsconf *conf)
 270 {
 271         static struct objcache_malloc_args margs_read;
 272         static struct objcache_malloc_args margs_write;
 273
 274         int error;
 275
 276         error = 0;
 277
 278         if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
 279                 error = EINVAL;
 280         if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
 281                 error = EINVAL;
 282         if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
 283                 error = EINVAL;
 284
 285         if (error)
 286                 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
 287
 288         margs_read.objsize = 65536;
 289         margs_read.mtype = D_BUFFER;
 290
 291         margs_write.objsize = 32768;
 292         margs_write.mtype = C_BUFFER;
 293
 294         cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc,
 295                                 0, 1, NULL, NULL, NULL, objcache_malloc_alloc,
 296                                 objcache_malloc_free, &margs_read);
 297         cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc,
 298                                 0, 1, NULL, NULL, NULL, objcache_malloc_alloc,
 299                                 objcache_malloc_free, &margs_write);
 300
 301         lockinit(&hammer2_mntlk, "mntlk", 0, 0);
 302         TAILQ_INIT(&hammer2_mntlist);
 303         TAILQ_INIT(&hammer2_pfslist);
 304
 305         hammer2_limit_dirty_chains = desiredvnodes / 10;
 306
 307         hammer2_trans_manage_init();
 308
 309         return (error);
 310 }
 311
 312 static
 313 int
 314 hammer2_vfs_uninit(struct vfsconf *vfsp __unused)
 315 {
 316         objcache_destroy(cache_buffer_read);
 317         objcache_destroy(cache_buffer_write);
 318         return 0;
 319 }
 320
 321 /*
 322  * Core PFS allocator.  Used to allocate the pmp structure for PFS cluster
 323  * mounts and the spmp structure for media (hmp) structures.
 324  */
 325 static hammer2_pfsmount_t *
 326 hammer2_pfsalloc(const hammer2_inode_data_t *ipdata, hammer2_tid_t alloc_tid)
 327 {
 328         hammer2_pfsmount_t *pmp;
 329
 330         pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
 331         kmalloc_create(&pmp->minode, "HAMMER2-inodes");
 332         kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
 333         lockinit(&pmp->lock, "pfslk", 0, 0);
 334         spin_init(&pmp->inum_spin);
 335         RB_INIT(&pmp->inum_tree);
 336         TAILQ_INIT(&pmp->unlinkq);
 337         spin_init(&pmp->unlinkq_spin);
 338
 339         pmp->alloc_tid = alloc_tid + 1;   /* our first media transaction id */
 340         pmp->flush_tid = pmp->alloc_tid;
 341         if (ipdata) {
 342                 pmp->inode_tid = ipdata->pfs_inum + 1;
 343                 pmp->pfs_clid = ipdata->pfs_clid;
 344         }
 345         mtx_init(&pmp->wthread_mtx);
 346         bioq_init(&pmp->wthread_bioq);
 347
 348         return pmp;
 349 }
 350
 351 /*
 352  * Mount or remount HAMMER2 fileystem from physical media
 353  *
 354  *      mountroot
 355  *              mp              mount point structure
 356  *              path            NULL
 357  *              data            <unused>
 358  *              cred            <unused>
 359  *
 360  *      mount
 361  *              mp              mount point structure
 362  *              path            path to mount point
 363  *              data            pointer to argument structure in user space
 364  *                      volume  volume path (device@LABEL form)
 365  *                      hflags  user mount flags
 366  *              cred            user credentials
 367  *
 368  * RETURNS:     0       Success
 369  *              !0      error number
 370  */
 371 static
 372 int
 373 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 374                   struct ucred *cred)
 375 {
 376         struct hammer2_mount_info info;
 377         hammer2_pfsmount_t *pmp;
 378         hammer2_pfsmount_t *spmp;
 379         hammer2_mount_t *hmp;
 380         hammer2_key_t key_next;
 381         hammer2_key_t key_dummy;
 382         hammer2_key_t lhc;
 383         struct vnode *devvp;
 384         struct nlookupdata nd;
 385         hammer2_chain_t *parent;
 386         hammer2_chain_t *rchain;
 387         hammer2_cluster_t *cluster;
 388         hammer2_cluster_t *cparent;
 389         const hammer2_inode_data_t *ipdata;
 390         hammer2_blockref_t bref;
 391         struct file *fp;
 392         char devstr[MNAMELEN];
 393         size_t size;
 394         size_t done;
 395         char *dev;
 396         char *label;
 397         int ronly = 1;
 398         int error;
 399         int cache_index;
 400         int ddflag;
 401         int i;
 402
 403         hmp = NULL;
 404         pmp = NULL;
 405         dev = NULL;
 406         label = NULL;
 407         devvp = NULL;
 408         cache_index = -1;
 409
 410         kprintf("hammer2_mount\n");
 411
 412         if (path == NULL) {
 413                 /*
 414                  * Root mount
 415                  */
 416                 bzero(&info, sizeof(info));
 417                 info.cluster_fd = -1;
 418                 return (EOPNOTSUPP);
 419         } else {
 420                 /*
 421                  * Non-root mount or updating a mount
 422                  */
 423                 error = copyin(data, &info, sizeof(info));
 424                 if (error)
 425                         return (error);
 426
 427                 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
 428                 if (error)
 429                         return (error);
 430
 431                 /* Extract device and label */
 432                 dev = devstr;
 433                 label = strchr(devstr, '@');
 434                 if (label == NULL ||
 435                     ((label + 1) - dev) > done) {
 436                         return (EINVAL);
 437                 }
 438                 *label = '\0';
 439                 label++;
 440                 if (*label == '\0')
 441                         return (EINVAL);
 442
 443                 if (mp->mnt_flag & MNT_UPDATE) {
 444                         /* Update mount */
 445                         /* HAMMER2 implements NFS export via mountctl */
 446                         pmp = MPTOPMP(mp);
 447                         for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
 448                                 hmp = pmp->iroot->cluster.array[i]->hmp;
 449                                 devvp = hmp->devvp;
 450                                 error = hammer2_remount(hmp, mp, path,
 451                                                         devvp, cred);
 452                                 if (error)
 453                                         break;
 454                         }
 455                         /*hammer2_inode_install_hidden(pmp);*/
 456
 457                         return error;
 458                 }
 459         }
 460
 461         /*
 462          * HMP device mount
 463          *
 464          * Lookup name and verify it refers to a block device.
 465          */
 466         error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
 467         if (error == 0)
 468                 error = nlookup(&nd);
 469         if (error == 0)
 470                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 471         nlookup_done(&nd);
 472
 473         if (error == 0) {
 474                 if (vn_isdisk(devvp, &error))
 475                         error = vfs_mountedon(devvp);
 476         }
 477
 478         /*
 479          * Determine if the device has already been mounted.  After this
 480          * check hmp will be non-NULL if we are doing the second or more
 481          * hammer2 mounts from the same device.
 482          */
 483         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 484         TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
 485                 if (hmp->devvp == devvp)
 486                         break;
 487         }
 488
 489         /*
 490          * Open the device if this isn't a secondary mount and construct
 491          * the H2 device mount (hmp).
 492          */
 493         if (hmp == NULL) {
 494                 hammer2_chain_t *schain;
 495                 hammer2_xid_t xid;
 496
 497                 if (error == 0 && vcount(devvp) > 0)
 498                         error = EBUSY;
 499
 500                 /*
 501                  * Now open the device
 502                  */
 503                 if (error == 0) {
 504                         ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 505                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 506                         error = vinvalbuf(devvp, V_SAVE, 0, 0);
 507                         if (error == 0) {
 508                                 error = VOP_OPEN(devvp,
 509                                                  ronly ? FREAD : FREAD | FWRITE,
 510                                                  FSCRED, NULL);
 511                         }
 512                         vn_unlock(devvp);
 513                 }
 514                 if (error && devvp) {
 515                         vrele(devvp);
 516                         devvp = NULL;
 517                 }
 518                 if (error) {
 519                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 520                         return error;
 521                 }
 522                 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
 523                 hmp->ronly = ronly;
 524                 hmp->devvp = devvp;
 525                 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
 526                 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
 527                 RB_INIT(&hmp->iotree);
 528
 529                 lockinit(&hmp->vollk, "h2vol", 0, 0);
 530
 531                 /*
 532                  * vchain setup. vchain.data is embedded.
 533                  * vchain.refs is initialized and will never drop to 0.
 534                  *
 535                  * NOTE! voldata is not yet loaded.
 536                  */
 537                 hmp->vchain.hmp = hmp;
 538                 hmp->vchain.refs = 1;
 539                 hmp->vchain.data = (void *)&hmp->voldata;
 540                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
 541                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 542                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
 543                 hmp->vchain.delete_xid = HAMMER2_XID_MAX;
 544
 545                 hammer2_chain_core_alloc(NULL, &hmp->vchain, NULL);
 546                 /* hmp->vchain.u.xxx is left NULL */
 547
 548                 /*
 549                  * fchain setup.  fchain.data is embedded.
 550                  * fchain.refs is initialized and will never drop to 0.
 551                  *
 552                  * The data is not used but needs to be initialized to
 553                  * pass assertion muster.  We use this chain primarily
 554                  * as a placeholder for the freemap's top-level RBTREE
 555                  * so it does not interfere with the volume's topology
 556                  * RBTREE.
 557                  */
 558                 hmp->fchain.hmp = hmp;
 559                 hmp->fchain.refs = 1;
 560                 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
 561                 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
 562                 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 563                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
 564                 hmp->fchain.bref.methods =
 565                         HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
 566                         HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
 567                 hmp->fchain.delete_xid = HAMMER2_XID_MAX;
 568
 569                 hammer2_chain_core_alloc(NULL, &hmp->fchain, NULL);
 570                 /* hmp->fchain.u.xxx is left NULL */
 571
 572                 /*
 573                  * Install the volume header and initialize fields from
 574                  * voldata.
 575                  */
 576                 error = hammer2_install_volume_header(hmp);
 577                 if (error) {
 578                         ++hmp->pmp_count;
 579                         hammer2_vfs_unmount_hmp1(mp, hmp);
 580                         hammer2_vfs_unmount_hmp2(mp, hmp);
 581                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 582                         hammer2_vfs_unmount(mp, MNT_FORCE);
 583                         return error;
 584                 }
 585
 586                 /*
 587                  * Really important to get these right or flush will get
 588                  * confused.
 589                  */
 590                 hmp->spmp = hammer2_pfsalloc(NULL, hmp->voldata.mirror_tid);
 591                 kprintf("alloc spmp %p tid %016jx\n",
 592                         hmp->spmp, hmp->voldata.mirror_tid);
 593                 spmp = hmp->spmp;
 594                 spmp->inode_tid = 1;
 595
 596                 xid = 0;
 597                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
 598                 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid;
 599                 hmp->vchain.modify_xid = xid;
 600                 hmp->vchain.update_xlo = xid;
 601                 hmp->vchain.update_xhi = xid;
 602                 hmp->vchain.pmp = spmp;
 603                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
 604                 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid;
 605                 hmp->fchain.modify_xid = xid;
 606                 hmp->fchain.update_xlo = xid;
 607                 hmp->fchain.update_xhi = xid;
 608                 hmp->fchain.pmp = spmp;
 609
 610                 /*
 611                  * First locate the super-root inode, which is key 0
 612                  * relative to the volume header's blockset.
 613                  *
 614                  * Then locate the root inode by scanning the directory keyspace
 615                  * represented by the label.
 616                  */
 617                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
 618                 schain = hammer2_chain_lookup(&parent, &key_dummy,
 619                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
 620                                       &cache_index, 0, &ddflag);
 621                 hammer2_chain_lookup_done(parent);
 622                 if (schain == NULL) {
 623                         kprintf("hammer2_mount: invalid super-root\n");
 624                         ++hmp->pmp_count;
 625                         hammer2_vfs_unmount_hmp1(mp, hmp);
 626                         hammer2_vfs_unmount_hmp2(mp, hmp);
 627                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 628                         hammer2_vfs_unmount(mp, MNT_FORCE);
 629                         return EINVAL;
 630                 }
 631
 632                 /*
 633                  * Sanity-check schain's pmp, finish initializing spmp.
 634                  */
 635                 KKASSERT(schain->pmp == spmp);
 636                 spmp->pfs_clid = schain->data->ipdata.pfs_clid;
 637
 638                 /*
 639                  * NOTE: The CHAIN_PFSROOT is not set on the super-root inode.
 640                  * NOTE: inode_get sucks up schain's lock.
 641                  */
 642                 cluster = hammer2_cluster_from_chain(schain);
 643                 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster);
 644                 spmp->spmp_hmp = hmp;
 645                 hammer2_inode_ref(spmp->iroot);
 646                 hammer2_inode_unlock_ex(spmp->iroot, cluster);
 647                 schain = NULL;
 648                 /* leave spmp->iroot with one ref */
 649
 650                 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
 651                         error = hammer2_recovery(hmp);
 652                         /* XXX do something with error */
 653                 }
 654                 ++hmp->pmp_count;
 655
 656                 /*
 657                  * XXX RDONLY stuff is totally broken FIXME XXX
 658                  *
 659                  * Automatic LNK_CONN
 660                  * Automatic handling of received LNK_SPAN
 661                  * Automatic handling of received LNK_CIRC
 662                  * No automatic LNK_SPAN generation - we do this ourselves
 663                  * No automatic LNK_CIRC generation - we do this ourselves
 664                  */
 665                 kdmsg_iocom_init(&hmp->iocom, hmp,
 666                                  KDMSG_IOCOMF_AUTOCONN |
 667                                  KDMSG_IOCOMF_AUTORXSPAN |
 668                                  KDMSG_IOCOMF_AUTORXCIRC,
 669                                  hmp->mchain, hammer2_rcvdmsg);
 670
 671                 /*
 672                  * Ref the cluster management messaging descriptor.  The mount
 673                  * program deals with the other end of the communications pipe.
 674                  */
 675                 fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
 676                 if (fp) {
 677                         hammer2_cluster_reconnect(hmp, fp);
 678                 } else {
 679                         kprintf("hammer2_mount: bad cluster_fd!\n");
 680                 }
 681         } else {
 682                 spmp = hmp->spmp;
 683                 ++hmp->pmp_count;
 684         }
 685
 686         /*
 687          * Lookup mount point under the media-localized super-root.
 688          *
 689          * cluster->pmp will incorrectly point to spmp and must be fixed
 690          * up later on.
 691          */
 692         cparent = hammer2_inode_lock_ex(spmp->iroot);
 693         lhc = hammer2_dirhash(label, strlen(label));
 694         cluster = hammer2_cluster_lookup(cparent, &key_next,
 695                                       lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 696                                       0, &ddflag);
 697         while (cluster) {
 698                 if (hammer2_cluster_type(cluster) == HAMMER2_BREF_TYPE_INODE &&
 699                     strcmp(label,
 700                        hammer2_cluster_data(cluster)->ipdata.filename) == 0) {
 701                         break;
 702                 }
 703                 cluster = hammer2_cluster_next(cparent, cluster, &key_next,
 704                                             key_next,
 705                                             lhc + HAMMER2_DIRHASH_LOMASK, 0);
 706         }
 707         hammer2_inode_unlock_ex(spmp->iroot, cparent);
 708
 709         if (cluster == NULL) {
 710                 kprintf("hammer2_mount: PFS label not found\n");
 711                 hammer2_vfs_unmount_hmp1(mp, hmp);
 712                 hammer2_vfs_unmount_hmp2(mp, hmp);
 713                 lockmgr(&hammer2_mntlk, LK_RELEASE);
 714                 hammer2_vfs_unmount(mp, MNT_FORCE);
 715                 return EINVAL;
 716         }
 717
 718         for (i = 0; i < cluster->nchains; ++i) {
 719                 rchain = cluster->array[i];
 720                 KKASSERT(rchain->pmp == NULL);
 721                 if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
 722                         kprintf("hammer2_mount: PFS label already mounted!\n");
 723                         hammer2_cluster_unlock(cluster);
 724                         hammer2_vfs_unmount_hmp1(mp, hmp);
 725                         hammer2_vfs_unmount_hmp2(mp, hmp);
 726                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 727                         hammer2_vfs_unmount(mp, MNT_FORCE);
 728                         return EBUSY;
 729                 }
 730 #if 0
 731                 if (rchain->flags & HAMMER2_CHAIN_RECYCLE) {
 732                         kprintf("hammer2_mount: PFS label is recycling\n");
 733                         hammer2_cluster_unlock(cluster);
 734                         hammer2_vfs_unmount_hmp1(mp, hmp);
 735                         hammer2_vfs_unmount_hmp2(mp, hmp);
 736                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 737                         hammer2_vfs_unmount(mp, MNT_FORCE);
 738                         return EBUSY;
 739                 }
 740 #endif
 741         }
 742
 743         /*
 744          * Check to see if the cluster id is already mounted at the mount
 745          * point.  If it is, add us to the cluster.
 746          */
 747         ipdata = &hammer2_cluster_data(cluster)->ipdata;
 748         hammer2_cluster_bref(cluster, &bref);
 749         TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
 750                 if (pmp->spmp_hmp == NULL &&
 751                     bcmp(&pmp->pfs_clid, &ipdata->pfs_clid,
 752                          sizeof(pmp->pfs_clid)) == 0) {
 753                         break;
 754                 }
 755         }
 756
 757         if (pmp) {
 758                 int i;
 759                 int j;
 760
 761                 hammer2_inode_ref(pmp->iroot);
 762                 ccms_thread_lock(&pmp->iroot->topo_cst, CCMS_STATE_EXCLUSIVE);
 763
 764                 if (pmp->iroot->cluster.nchains + cluster->nchains >
 765                     HAMMER2_MAXCLUSTER) {
 766                         kprintf("hammer2_mount: cluster full!\n");
 767
 768                         ccms_thread_unlock(&pmp->iroot->topo_cst);
 769                         hammer2_inode_drop(pmp->iroot);
 770
 771                         hammer2_cluster_unlock(cluster);
 772                         hammer2_vfs_unmount_hmp1(mp, hmp);
 773                         hammer2_vfs_unmount_hmp2(mp, hmp);
 774                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 775                         hammer2_vfs_unmount(mp, MNT_FORCE);
 776                         return EBUSY;
 777                 }
 778                 kprintf("hammer2_vfs_mount: Adding pfs to existing cluster\n");
 779                 j = pmp->iroot->cluster.nchains;
 780                 for (i = 0; i < cluster->nchains; ++i) {
 781                         rchain = cluster->array[i];
 782                         KKASSERT(rchain->pmp == NULL);
 783                         rchain->pmp = pmp;
 784                         hammer2_chain_ref(cluster->array[i]);
 785                         pmp->iroot->cluster.array[j] = cluster->array[i];
 786                         ++j;
 787                 }
 788                 pmp->iroot->cluster.nchains = j;
 789                 ccms_thread_unlock(&pmp->iroot->topo_cst);
 790                 hammer2_inode_drop(pmp->iroot);
 791                 hammer2_cluster_unlock(cluster);
 792                 lockmgr(&hammer2_mntlk, LK_RELEASE);
 793
 794                 kprintf("ok\n");
 795                 hammer2_inode_install_hidden(pmp);
 796
 797                 return ERANGE;
 798         }
 799
 800         /*
 801          * Block device opened successfully, finish initializing the
 802          * mount structure.
 803          *
 804          * From this point on we have to call hammer2_unmount() on failure.
 805          */
 806         pmp = hammer2_pfsalloc(ipdata, bref.mirror_tid);
 807         kprintf("PMP mirror_tid is %016jx\n", bref.mirror_tid);
 808         for (i = 0; i < cluster->nchains; ++i) {
 809                 rchain = cluster->array[i];
 810                 KKASSERT(rchain->pmp == NULL);
 811                 rchain->pmp = pmp;
 812                 atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
 813         }
 814         cluster->pmp = pmp;
 815
 816         ccms_domain_init(&pmp->ccms_dom);
 817         TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry);
 818         lockmgr(&hammer2_mntlk, LK_RELEASE);
 819
 820         kprintf("hammer2_mount hmp=%p pmp=%p pmpcnt=%d\n",
 821                 hmp, pmp, hmp->pmp_count);
 822
 823         mp->mnt_flag = MNT_LOCAL;
 824         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
 825         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
 826
 827         /*
 828          * required mount structure initializations
 829          */
 830         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
 831         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
 832
 833         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
 834         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 835
 836         /*
 837          * Optional fields
 838          */
 839         mp->mnt_iosize_max = MAXPHYS;
 840         mp->mnt_data = (qaddr_t)pmp;
 841         pmp->mp = mp;
 842
 843         /*
 844          * After this point hammer2_vfs_unmount() has visibility on hmp
 845          * and manual hmp1/hmp2 calls are not needed on fatal errors.
 846          */
 847         pmp->iroot = hammer2_inode_get(pmp, NULL, cluster);
 848         hammer2_inode_ref(pmp->iroot);          /* ref for pmp->iroot */
 849         hammer2_inode_unlock_ex(pmp->iroot, cluster);
 850
 851         /*
 852          * The logical file buffer bio write thread handles things
 853          * like physical block assignment and compression.
 854          *
 855          * (only applicable to pfs mounts, not applicable to spmp)
 856          */
 857         pmp->wthread_destroy = 0;
 858         lwkt_create(hammer2_write_thread, pmp,
 859                     &pmp->wthread_td, NULL, 0, -1, "hwrite-%s", label);
 860
 861         /*
 862          * With the cluster operational install ihidden.
 863          * (only applicable to pfs mounts, not applicable to spmp)
 864          */
 865         hammer2_inode_install_hidden(pmp);
 866
 867         /*
 868          * Finish setup
 869          */
 870         vfs_getnewfsid(mp);
 871         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
 872         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
 873         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
 874
 875         copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 876         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 877         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
 878         copyinstr(path, mp->mnt_stat.f_mntonname,
 879                   sizeof(mp->mnt_stat.f_mntonname) - 1,
 880                   &size);
 881
 882         /*
 883          * Initial statfs to prime mnt_stat.
 884          */
 885         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
 886
 887         return 0;
 888 }
 889
 890 /*
 891  * Handle bioq for strategy write
 892  */
 893 static
 894 void
 895 hammer2_write_thread(void *arg)
 896 {
 897         hammer2_pfsmount_t *pmp;
 898         struct bio *bio;
 899         struct buf *bp;
 900         hammer2_trans_t trans;
 901         struct vnode *vp;
 902         hammer2_inode_t *ip;
 903         hammer2_cluster_t *cparent;
 904         hammer2_inode_data_t *wipdata;
 905         hammer2_key_t lbase;
 906         int lblksize;
 907         int pblksize;
 908         int error;
 909
 910         pmp = arg;
 911
 912         mtx_lock(&pmp->wthread_mtx);
 913         while (pmp->wthread_destroy == 0) {
 914                 if (bioq_first(&pmp->wthread_bioq) == NULL) {
 915                         mtxsleep(&pmp->wthread_bioq, &pmp->wthread_mtx,
 916                                  0, "h2bioqw", 0);
 917                 }
 918                 cparent = NULL;
 919
 920                 hammer2_trans_init(&trans, pmp, HAMMER2_TRANS_BUFCACHE);
 921
 922                 while ((bio = bioq_takefirst(&pmp->wthread_bioq)) != NULL) {
 923                         /*
 924                          * dummy bio for synchronization.  The transaction
 925                          * must be reinitialized.
 926                          */
 927                         if (bio->bio_buf == NULL) {
 928                                 bio->bio_flags |= BIO_DONE;
 929                                 wakeup(bio);
 930                                 hammer2_trans_done(&trans);
 931                                 hammer2_trans_init(&trans, pmp,
 932                                                    HAMMER2_TRANS_BUFCACHE);
 933                                 continue;
 934                         }
 935
 936                         /*
 937                          * else normal bio processing
 938                          */
 939                         mtx_unlock(&pmp->wthread_mtx);
 940
 941                         hammer2_lwinprog_drop(pmp);
 942
 943                         error = 0;
 944                         bp = bio->bio_buf;
 945                         vp = bp->b_vp;
 946                         ip = VTOI(vp);
 947
 948                         /*
 949                          * Inode is modified, flush size and mtime changes
 950                          * to ensure that the file size remains consistent
 951                          * with the buffers being flushed.
 952                          *
 953                          * NOTE: The inode_fsync() call only flushes the
 954                          *       inode's meta-data state, it doesn't try
 955                          *       to flush underlying buffers or chains.
 956                          */
 957                         cparent = hammer2_inode_lock_ex(ip);
 958                         if (ip->flags & (HAMMER2_INODE_RESIZED |
 959                                          HAMMER2_INODE_MTIME)) {
 960                                 hammer2_inode_fsync(&trans, ip, cparent);
 961                         }
 962                         wipdata = hammer2_cluster_modify_ip(&trans, ip,
 963                                                          cparent, 0);
 964                         lblksize = hammer2_calc_logical(ip, bio->bio_offset,
 965                                                         &lbase, NULL);
 966                         pblksize = hammer2_calc_physical(ip, wipdata, lbase);
 967                         hammer2_write_file_core(bp, &trans, ip, wipdata,
 968                                                 cparent,
 969                                                 lbase, IO_ASYNC,
 970                                                 pblksize, &error);
 971                         hammer2_cluster_modsync(cparent);
 972                         hammer2_inode_unlock_ex(ip, cparent);
 973                         if (error) {
 974                                 kprintf("hammer2: error in buffer write\n");
 975                                 bp->b_flags |= B_ERROR;
 976                                 bp->b_error = EIO;
 977                         }
 978                         biodone(bio);
 979                         mtx_lock(&pmp->wthread_mtx);
 980                 }
 981                 hammer2_trans_done(&trans);
 982         }
 983         pmp->wthread_destroy = -1;
 984         wakeup(&pmp->wthread_destroy);
 985
 986         mtx_unlock(&pmp->wthread_mtx);
 987 }
 988
 989 void
 990 hammer2_bioq_sync(hammer2_pfsmount_t *pmp)
 991 {
 992         struct bio sync_bio;
 993
 994         bzero(&sync_bio, sizeof(sync_bio));     /* dummy with no bio_buf */
 995         mtx_lock(&pmp->wthread_mtx);
 996         if (pmp->wthread_destroy == 0 &&
 997             TAILQ_FIRST(&pmp->wthread_bioq.queue)) {
 998                 bioq_insert_tail(&pmp->wthread_bioq, &sync_bio);
 999                 while ((sync_bio.bio_flags & BIO_DONE) == 0)
1000                         mtxsleep(&sync_bio, &pmp->wthread_mtx, 0, "h2bioq", 0);
1001         }
1002         mtx_unlock(&pmp->wthread_mtx);
1003 }
1004
1005 /*
1006  * Return a chain suitable for I/O, creating the chain if necessary
1007  * and assigning its physical block.
1008  */
1009 static
1010 hammer2_cluster_t *
1011 hammer2_assign_physical(hammer2_trans_t *trans,
1012                         hammer2_inode_t *ip, hammer2_cluster_t *cparent,
1013                         hammer2_key_t lbase, int pblksize, int *errorp)
1014 {
1015         hammer2_cluster_t *cluster;
1016         hammer2_cluster_t *dparent;
1017         hammer2_key_t key_dummy;
1018         int pradix = hammer2_getradix(pblksize);
1019         int ddflag;
1020
1021         /*
1022          * Locate the chain associated with lbase, return a locked chain.
1023          * However, do not instantiate any data reference (which utilizes a
1024          * device buffer) because we will be using direct IO via the
1025          * logical buffer cache buffer.
1026          */
1027         *errorp = 0;
1028         KKASSERT(pblksize >= HAMMER2_ALLOC_MIN);
1029 retry:
1030         dparent = hammer2_cluster_lookup_init(cparent, 0);
1031         cluster = hammer2_cluster_lookup(dparent, &key_dummy,
1032                                      lbase, lbase,
1033                                      HAMMER2_LOOKUP_NODATA, &ddflag);
1034
1035         if (cluster == NULL) {
1036                 /*
1037                  * We found a hole, create a new chain entry.
1038                  *
1039                  * NOTE: DATA chains are created without device backing
1040                  *       store (nor do we want any).
1041                  */
1042                 *errorp = hammer2_cluster_create(trans, dparent, &cluster,
1043                                                lbase, HAMMER2_PBUFRADIX,
1044                                                HAMMER2_BREF_TYPE_DATA,
1045                                                pblksize);
1046                 if (cluster == NULL) {
1047                         hammer2_cluster_lookup_done(dparent);
1048                         panic("hammer2_cluster_create: par=%p error=%d\n",
1049                                 dparent->focus, *errorp);
1050                         goto retry;
1051                 }
1052                 /*ip->delta_dcount += pblksize;*/
1053         } else {
1054                 switch (hammer2_cluster_type(cluster)) {
1055                 case HAMMER2_BREF_TYPE_INODE:
1056                         /*
1057                          * The data is embedded in the inode.  The
1058                          * caller is responsible for marking the inode
1059                          * modified and copying the data to the embedded
1060                          * area.
1061                          */
1062                         break;
1063                 case HAMMER2_BREF_TYPE_DATA:
1064                         if (hammer2_cluster_bytes(cluster) != pblksize) {
1065                                 hammer2_cluster_resize(trans, ip,
1066                                                      dparent, cluster,
1067                                                      pradix,
1068                                                      HAMMER2_MODIFY_OPTDATA);
1069                         }
1070                         hammer2_cluster_modify(trans, cluster,
1071                                              HAMMER2_MODIFY_OPTDATA);
1072                         break;
1073                 default:
1074                         panic("hammer2_assign_physical: bad type");
1075                         /* NOT REACHED */
1076                         break;
1077                 }
1078         }
1079
1080         /*
1081          * Cleanup.  If cluster wound up being the inode itself, i.e.
1082          * the DIRECTDATA case for offset 0, then we need to update cparent.
1083          * The caller expects cparent to not become stale.
1084          */
1085         hammer2_cluster_lookup_done(dparent);
1086         /* dparent = NULL; safety */
1087         if (cluster && ddflag)
1088                 hammer2_cluster_replace_locked(cparent, cluster);
1089         return (cluster);
1090 }
1091
1092 /*
1093  * From hammer2_vnops.c.
1094  * The core write function which determines which path to take
1095  * depending on compression settings.
1096  */
1097 static
1098 void
1099 hammer2_write_file_core(struct buf *bp, hammer2_trans_t *trans,
1100                         hammer2_inode_t *ip, hammer2_inode_data_t *ipdata,
1101                         hammer2_cluster_t *cparent,
1102                         hammer2_key_t lbase, int ioflag, int pblksize,
1103                         int *errorp)
1104 {
1105         hammer2_cluster_t *cluster;
1106
1107         switch(HAMMER2_DEC_COMP(ipdata->comp_algo)) {
1108         case HAMMER2_COMP_NONE:
1109                 /*
1110                  * We have to assign physical storage to the buffer
1111                  * we intend to dirty or write now to avoid deadlocks
1112                  * in the strategy code later.
1113                  *
1114                  * This can return NOOFFSET for inode-embedded data.
1115                  * The strategy code will take care of it in that case.
1116                  */
1117                 cluster = hammer2_assign_physical(trans, ip, cparent,
1118                                                 lbase, pblksize,
1119                                                 errorp);
1120                 hammer2_write_bp(cluster, bp, ioflag, pblksize, errorp);
1121                 if (cluster)
1122                         hammer2_cluster_unlock(cluster);
1123                 break;
1124         case HAMMER2_COMP_AUTOZERO:
1125                 /*
1126                  * Check for zero-fill only
1127                  */
1128                 hammer2_zero_check_and_write(bp, trans, ip,
1129                                     ipdata, cparent, lbase,
1130                                     ioflag, pblksize, errorp);
1131                 break;
1132         case HAMMER2_COMP_LZ4:
1133         case HAMMER2_COMP_ZLIB:
1134         default:
1135                 /*
1136                  * Check for zero-fill and attempt compression.
1137                  */
1138                 hammer2_compress_and_write(bp, trans, ip,
1139                                            ipdata, cparent,
1140                                            lbase, ioflag,
1141                                            pblksize, errorp,
1142                                            ipdata->comp_algo);
1143                 break;
1144         }
1145 }
1146
1147 /*
1148  * Generic function that will perform the compression in compression
1149  * write path. The compression algorithm is determined by the settings
1150  * obtained from inode.
1151  */
1152 static
1153 void
1154 hammer2_compress_and_write(struct buf *bp, hammer2_trans_t *trans,
1155         hammer2_inode_t *ip, const hammer2_inode_data_t *ipdata,
1156         hammer2_cluster_t *cparent,
1157         hammer2_key_t lbase, int ioflag, int pblksize,
1158         int *errorp, int comp_algo)
1159 {
1160         hammer2_cluster_t *cluster;
1161         hammer2_chain_t *chain;
1162         int comp_size;
1163         int comp_block_size;
1164         int i;
1165         char *comp_buffer;
1166
1167         if (test_block_zeros(bp->b_data, pblksize)) {
1168                 zero_write(bp, trans, ip, ipdata, cparent, lbase, errorp);
1169                 return;
1170         }
1171
1172         comp_size = 0;
1173         comp_buffer = NULL;
1174
1175         KKASSERT(pblksize / 2 <= 32768);
1176
1177         if (ip->comp_heuristic < 8 || (ip->comp_heuristic & 7) == 0) {
1178                 z_stream strm_compress;
1179                 int comp_level;
1180                 int ret;
1181
1182                 switch(HAMMER2_DEC_COMP(comp_algo)) {
1183                 case HAMMER2_COMP_LZ4:
1184                         comp_buffer = objcache_get(cache_buffer_write,
1185                                                    M_INTWAIT);
1186                         comp_size = LZ4_compress_limitedOutput(
1187                                         bp->b_data,
1188                                         &comp_buffer[sizeof(int)],
1189                                         pblksize,
1190                                         pblksize / 2 - sizeof(int));
1191                         /*
1192                          * We need to prefix with the size, LZ4
1193                          * doesn't do it for us.  Add the related
1194                          * overhead.
1195                          */
1196                         *(int *)comp_buffer = comp_size;
1197                         if (comp_size)
1198                                 comp_size += sizeof(int);
1199                         break;
1200                 case HAMMER2_COMP_ZLIB:
1201                         comp_level = HAMMER2_DEC_LEVEL(comp_algo);
1202                         if (comp_level == 0)
1203                                 comp_level = 6; /* default zlib compression */
1204                         else if (comp_level < 6)
1205                                 comp_level = 6;
1206                         else if (comp_level > 9)
1207                                 comp_level = 9;
1208                         ret = deflateInit(&strm_compress, comp_level);
1209                         if (ret != Z_OK) {
1210                                 kprintf("HAMMER2 ZLIB: fatal error "
1211                                         "on deflateInit.\n");
1212                         }
1213
1214                         comp_buffer = objcache_get(cache_buffer_write,
1215                                                    M_INTWAIT);
1216                         strm_compress.next_in = bp->b_data;
1217                         strm_compress.avail_in = pblksize;
1218                         strm_compress.next_out = comp_buffer;
1219                         strm_compress.avail_out = pblksize / 2;
1220                         ret = deflate(&strm_compress, Z_FINISH);
1221                         if (ret == Z_STREAM_END) {
1222                                 comp_size = pblksize / 2 -
1223                                             strm_compress.avail_out;
1224                         } else {
1225                                 comp_size = 0;
1226                         }
1227                         ret = deflateEnd(&strm_compress);
1228                         break;
1229                 default:
1230                         kprintf("Error: Unknown compression method.\n");
1231                         kprintf("Comp_method = %d.\n", comp_algo);
1232                         break;
1233                 }
1234         }
1235
1236         if (comp_size == 0) {
1237                 /*
1238                  * compression failed or turned off
1239                  */
1240                 comp_block_size = pblksize;     /* safety */
1241                 if (++ip->comp_heuristic > 128)
1242                         ip->comp_heuristic = 8;
1243         } else {
1244                 /*
1245                  * compression succeeded
1246                  */
1247                 ip->comp_heuristic = 0;
1248                 if (comp_size <= 1024) {
1249                         comp_block_size = 1024;
1250                 } else if (comp_size <= 2048) {
1251                         comp_block_size = 2048;
1252                 } else if (comp_size <= 4096) {
1253                         comp_block_size = 4096;
1254                 } else if (comp_size <= 8192) {
1255                         comp_block_size = 8192;
1256                 } else if (comp_size <= 16384) {
1257                         comp_block_size = 16384;
1258                 } else if (comp_size <= 32768) {
1259                         comp_block_size = 32768;
1260                 } else {
1261                         panic("hammer2: WRITE PATH: "
1262                               "Weird comp_size value.");
1263                         /* NOT REACHED */
1264                         comp_block_size = pblksize;
1265                 }
1266         }
1267
1268         cluster = hammer2_assign_physical(trans, ip, cparent,
1269                                           lbase, comp_block_size,
1270                                           errorp);
1271         ipdata = &hammer2_cluster_data(cparent)->ipdata;
1272
1273         if (*errorp) {
1274                 kprintf("WRITE PATH: An error occurred while "
1275                         "assigning physical space.\n");
1276                 KKASSERT(cluster == NULL);
1277                 goto done;
1278         }
1279
1280         for (i = 0; i < cluster->nchains; ++i) {
1281                 hammer2_io_t *dio;
1282                 char *bdata;
1283                 int temp_check;
1284
1285                 chain = cluster->array[i];
1286                 KKASSERT(chain->flags & HAMMER2_CHAIN_MODIFIED);
1287
1288                 switch(chain->bref.type) {
1289                 case HAMMER2_BREF_TYPE_INODE:
1290                         KKASSERT(chain->data->ipdata.op_flags &
1291                                  HAMMER2_OPFLAG_DIRECTDATA);
1292                         KKASSERT(bp->b_loffset == 0);
1293                         bcopy(bp->b_data, chain->data->ipdata.u.data,
1294                               HAMMER2_EMBEDDED_BYTES);
1295                         break;
1296                 case HAMMER2_BREF_TYPE_DATA:
1297                         temp_check = HAMMER2_DEC_CHECK(chain->bref.methods);
1298
1299                         /*
1300                          * Optimize out the read-before-write
1301                          * if possible.
1302                          */
1303                         *errorp = hammer2_io_newnz(chain->hmp,
1304                                                    chain->bref.data_off,
1305                                                    chain->bytes,
1306                                                    &dio);
1307                         if (*errorp) {
1308                                 hammer2_io_brelse(&dio);
1309                                 kprintf("hammer2: WRITE PATH: "
1310                                         "dbp bread error\n");
1311                                 break;
1312                         }
1313                         bdata = hammer2_io_data(dio, chain->bref.data_off);
1314
1315                         /*
1316                          * When loading the block make sure we don't
1317                          * leave garbage after the compressed data.
1318                          */
1319                         if (comp_size) {
1320                                 chain->bref.methods =
1321                                         HAMMER2_ENC_COMP(comp_algo) +
1322                                         HAMMER2_ENC_CHECK(temp_check);
1323                                 bcopy(comp_buffer, bdata, comp_size);
1324                                 if (comp_size != comp_block_size) {
1325                                         bzero(bdata + comp_size,
1326                                               comp_block_size - comp_size);
1327                                 }
1328                         } else {
1329                                 chain->bref.methods =
1330                                         HAMMER2_ENC_COMP(
1331                                                 HAMMER2_COMP_NONE) +
1332                                         HAMMER2_ENC_CHECK(temp_check);
1333                                 bcopy(bp->b_data, bdata, pblksize);
1334                         }
1335
1336                         /*
1337                          * Device buffer is now valid, chain is no
1338                          * longer in the initial state.
1339                          */
1340                         atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL);
1341
1342                         /* Now write the related bdp. */
1343                         if (ioflag & IO_SYNC) {
1344                                 /*
1345                                  * Synchronous I/O requested.
1346                                  */
1347                                 hammer2_io_bwrite(&dio);
1348                         /*
1349                         } else if ((ioflag & IO_DIRECT) &&
1350                                    loff + n == pblksize) {
1351                                 hammer2_io_bdwrite(&dio);
1352                         */
1353                         } else if (ioflag & IO_ASYNC) {
1354                                 hammer2_io_bawrite(&dio);
1355                         } else {
1356                                 hammer2_io_bdwrite(&dio);
1357                         }
1358                         break;
1359                 default:
1360                         panic("hammer2_write_bp: bad chain type %d\n",
1361                                 chain->bref.type);
1362                         /* NOT REACHED */
1363                         break;
1364                 }
1365         }
1366 done:
1367         if (cluster)
1368                 hammer2_cluster_unlock(cluster);
1369         if (comp_buffer)
1370                 objcache_put(cache_buffer_write, comp_buffer);
1371 }
1372
1373 /*
1374  * Function that performs zero-checking and writing without compression,
1375  * it corresponds to default zero-checking path.
1376  */
1377 static
1378 void
1379 hammer2_zero_check_and_write(struct buf *bp, hammer2_trans_t *trans,
1380         hammer2_inode_t *ip, const hammer2_inode_data_t *ipdata,
1381         hammer2_cluster_t *cparent,
1382         hammer2_key_t lbase, int ioflag, int pblksize, int *errorp)
1383 {
1384         hammer2_cluster_t *cluster;
1385
1386         if (test_block_zeros(bp->b_data, pblksize)) {
1387                 zero_write(bp, trans, ip, ipdata, cparent, lbase, errorp);
1388         } else {
1389                 cluster = hammer2_assign_physical(trans, ip, cparent,
1390                                                   lbase, pblksize, errorp);
1391                 hammer2_write_bp(cluster, bp, ioflag, pblksize, errorp);
1392                 if (cluster)
1393                         hammer2_cluster_unlock(cluster);
1394         }
1395 }
1396
1397 /*
1398  * A function to test whether a block of data contains only zeros,
1399  * returns TRUE (non-zero) if the block is all zeros.
1400  */
1401 static
1402 int
1403 test_block_zeros(const char *buf, size_t bytes)
1404 {
1405         size_t i;
1406
1407         for (i = 0; i < bytes; i += sizeof(long)) {
1408                 if (*(const long *)(buf + i) != 0)
1409                         return (0);
1410         }
1411         return (1);
1412 }
1413
1414 /*
1415  * Function to "write" a block that contains only zeros.
1416  */
1417 static
1418 void
1419 zero_write(struct buf *bp, hammer2_trans_t *trans,
1420         hammer2_inode_t *ip, const hammer2_inode_data_t *ipdata,
1421         hammer2_cluster_t *cparent,
1422         hammer2_key_t lbase, int *errorp __unused)
1423 {
1424         hammer2_cluster_t *cluster;
1425         hammer2_media_data_t *data;
1426         hammer2_key_t key_dummy;
1427         int ddflag;
1428
1429         cparent = hammer2_cluster_lookup_init(cparent, 0);
1430         cluster = hammer2_cluster_lookup(cparent, &key_dummy, lbase, lbase,
1431                                      HAMMER2_LOOKUP_NODATA, &ddflag);
1432         if (cluster) {
1433                 data = hammer2_cluster_wdata(cluster);
1434
1435                 if (ddflag) {
1436                         KKASSERT(cluster->focus->flags &
1437                                  HAMMER2_CHAIN_MODIFIED);
1438                         bzero(data->ipdata.u.data, HAMMER2_EMBEDDED_BYTES);
1439                         hammer2_cluster_modsync(cluster);
1440                 } else {
1441                         hammer2_cluster_delete(trans, cluster, 0);
1442                 }
1443                 hammer2_cluster_unlock(cluster);
1444         }
1445         hammer2_cluster_lookup_done(cparent);
1446 }
1447
1448 /*
1449  * Function to write the data as it is, without performing any sort of
1450  * compression. This function is used in path without compression and
1451  * default zero-checking path.
1452  */
1453 static
1454 void
1455 hammer2_write_bp(hammer2_cluster_t *cluster, struct buf *bp, int ioflag,
1456                                 int pblksize, int *errorp)
1457 {
1458         hammer2_chain_t *chain;
1459         hammer2_io_t *dio;
1460         char *bdata;
1461         int error;
1462         int i;
1463         int temp_check;
1464
1465         error = 0;      /* XXX TODO below */
1466
1467         for (i = 0; i < cluster->nchains; ++i) {
1468                 chain = cluster->array[i];
1469
1470                 temp_check = HAMMER2_DEC_CHECK(chain->bref.methods);
1471
1472                 KKASSERT(chain->flags & HAMMER2_CHAIN_MODIFIED);
1473
1474                 switch(chain->bref.type) {
1475                 case HAMMER2_BREF_TYPE_INODE:
1476                         KKASSERT(chain->data->ipdata.op_flags &
1477                                  HAMMER2_OPFLAG_DIRECTDATA);
1478                         KKASSERT(bp->b_loffset == 0);
1479                         bcopy(bp->b_data, chain->data->ipdata.u.data,
1480                               HAMMER2_EMBEDDED_BYTES);
1481                         error = 0;
1482                         break;
1483                 case HAMMER2_BREF_TYPE_DATA:
1484                         error = hammer2_io_newnz(chain->hmp,
1485                                                  chain->bref.data_off,
1486                                                  chain->bytes, &dio);
1487                         if (error) {
1488                                 hammer2_io_bqrelse(&dio);
1489                                 kprintf("hammer2: WRITE PATH: "
1490                                         "dbp bread error\n");
1491                                 break;
1492                         }
1493                         bdata = hammer2_io_data(dio, chain->bref.data_off);
1494
1495                         chain->bref.methods = HAMMER2_ENC_COMP(
1496                                                         HAMMER2_COMP_NONE) +
1497                                               HAMMER2_ENC_CHECK(temp_check);
1498                         bcopy(bp->b_data, bdata, chain->bytes);
1499
1500                         /*
1501                          * Device buffer is now valid, chain is no
1502                          * longer in the initial state.
1503                          */
1504                         atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL);
1505
1506                         if (ioflag & IO_SYNC) {
1507                                 /*
1508                                  * Synchronous I/O requested.
1509                                  */
1510                                 hammer2_io_bwrite(&dio);
1511                         /*
1512                         } else if ((ioflag & IO_DIRECT) &&
1513                                    loff + n == pblksize) {
1514                                 hammer2_io_bdwrite(&dio);
1515                         */
1516                         } else if (ioflag & IO_ASYNC) {
1517                                 hammer2_io_bawrite(&dio);
1518                         } else {
1519                                 hammer2_io_bdwrite(&dio);
1520                         }
1521                         break;
1522                 default:
1523                         panic("hammer2_write_bp: bad chain type %d\n",
1524                               chain->bref.type);
1525                         /* NOT REACHED */
1526                         error = 0;
1527                         break;
1528                 }
1529                 KKASSERT(error == 0);   /* XXX TODO */
1530         }
1531         *errorp = error;
1532 }
1533
1534 static
1535 int
1536 hammer2_remount(hammer2_mount_t *hmp, struct mount *mp, char *path,
1537                 struct vnode *devvp, struct ucred *cred)
1538 {
1539         int error;
1540
1541         if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
1542                 error = hammer2_recovery(hmp);
1543         } else {
1544                 error = 0;
1545         }
1546         return error;
1547 }
1548
1549 static
1550 int
1551 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1552 {
1553         hammer2_pfsmount_t *pmp;
1554         hammer2_mount_t *hmp;
1555         hammer2_chain_t *rchain;
1556         hammer2_cluster_t *cluster;
1557         int flags;
1558         int error = 0;
1559         int i;
1560
1561         pmp = MPTOPMP(mp);
1562
1563         if (pmp == NULL)
1564                 return(0);
1565
1566         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1567         TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry);
1568
1569         /*
1570          * If mount initialization proceeded far enough we must flush
1571          * its vnodes.
1572          */
1573         if (mntflags & MNT_FORCE)
1574                 flags = FORCECLOSE;
1575         else
1576                 flags = 0;
1577         if (pmp->iroot) {
1578                 error = vflush(mp, 0, flags);
1579                 if (error)
1580                         goto failed;
1581         }
1582
1583         ccms_domain_uninit(&pmp->ccms_dom);
1584
1585         if (pmp->wthread_td) {
1586                 mtx_lock(&pmp->wthread_mtx);
1587                 pmp->wthread_destroy = 1;
1588                 wakeup(&pmp->wthread_bioq);
1589                 while (pmp->wthread_destroy != -1) {
1590                         mtxsleep(&pmp->wthread_destroy,
1591                                 &pmp->wthread_mtx, 0,
1592                                 "umount-sleep", 0);
1593                 }
1594                 mtx_unlock(&pmp->wthread_mtx);
1595                 pmp->wthread_td = NULL;
1596         }
1597
1598         /*
1599          * Cleanup our reference on ihidden.
1600          */
1601         if (pmp->ihidden) {
1602                 hammer2_inode_drop(pmp->ihidden);
1603                 pmp->ihidden = NULL;
1604         }
1605
1606         /*
1607          * Cleanup our reference on iroot.  iroot is (should) not be needed
1608          * by the flush code.
1609          */
1610         if (pmp->iroot) {
1611                 cluster = &pmp->iroot->cluster;
1612                 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1613                         rchain = pmp->iroot->cluster.array[i];
1614                         if (rchain == NULL)
1615                                 continue;
1616                         hmp = rchain->hmp;
1617                         hammer2_vfs_unmount_hmp1(mp, hmp);
1618
1619                         atomic_clear_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
1620 #if REPORT_REFS_ERRORS
1621                         if (rchain->refs != 1)
1622                                 kprintf("PMP->RCHAIN %p REFS WRONG %d\n",
1623                                         rchain, rchain->refs);
1624 #else
1625                         KKASSERT(rchain->refs == 1);
1626 #endif
1627                         hammer2_chain_drop(rchain);
1628                         cluster->array[i] = NULL;
1629                         hammer2_vfs_unmount_hmp2(mp, hmp);
1630                 }
1631                 cluster->focus = NULL;
1632
1633 #if REPORT_REFS_ERRORS
1634                 if (pmp->iroot->refs != 1)
1635                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
1636                                 pmp->iroot, pmp->iroot->refs);
1637 #else
1638                 KKASSERT(pmp->iroot->refs == 1);
1639 #endif
1640                 /* ref for pmp->iroot */
1641                 hammer2_inode_drop(pmp->iroot);
1642                 pmp->iroot = NULL;
1643         }
1644
1645         pmp->mp = NULL;
1646         mp->mnt_data = NULL;
1647
1648         kmalloc_destroy(&pmp->mmsg);
1649         kmalloc_destroy(&pmp->minode);
1650
1651         kfree(pmp, M_HAMMER2);
1652         error = 0;
1653
1654 failed:
1655         lockmgr(&hammer2_mntlk, LK_RELEASE);
1656
1657         return (error);
1658 }
1659
1660 static
1661 void
1662 hammer2_vfs_unmount_hmp1(struct mount *mp, hammer2_mount_t *hmp)
1663 {
1664         hammer2_mount_exlock(hmp);
1665         --hmp->pmp_count;
1666
1667         kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
1668
1669         kdmsg_iocom_uninit(&hmp->iocom);        /* XXX chain depend deadlck? */
1670
1671         /*
1672          * Flush any left over chains.  The voldata lock is only used
1673          * to synchronize against HAMMER2_CHAIN_MODIFIED_AUX.
1674          *
1675          * Flush twice to ensure that the freemap is completely
1676          * synchronized.  If we only do it once the next mount's
1677          * recovery scan will have to do some fixups (which isn't
1678          * bad, but we don't want it to have to do it except when
1679          * recovering from a crash).
1680          */
1681         hammer2_voldata_lock(hmp);
1682         if (((hmp->vchain.flags | hmp->fchain.flags) &
1683              HAMMER2_CHAIN_MODIFIED) ||
1684             hmp->vchain.update_xhi > hmp->vchain.update_xlo ||
1685             hmp->fchain.update_xhi > hmp->fchain.update_xlo) {
1686                 hammer2_voldata_unlock(hmp);
1687                 hammer2_vfs_sync(mp, MNT_WAIT);
1688                 /*hammer2_vfs_sync(mp, MNT_WAIT);*/
1689         } else {
1690                 hammer2_voldata_unlock(hmp);
1691         }
1692         if (hmp->pmp_count == 0) {
1693                 if (((hmp->vchain.flags | hmp->fchain.flags) &
1694                      HAMMER2_CHAIN_MODIFIED) ||
1695                     hmp->vchain.update_xhi > hmp->vchain.update_xlo ||
1696                     hmp->fchain.update_xhi > hmp->fchain.update_xlo) {
1697                         kprintf("hammer2_unmount: chains left over "
1698                                 "after final sync\n");
1699                         kprintf("    vchain %08x update_xlo/hi %08x/%08x\n",
1700                                 hmp->vchain.flags,
1701                                 hmp->vchain.update_xlo,
1702                                 hmp->vchain.update_xhi);
1703                         kprintf("    fchain %08x update_xhi/hi %08x/%08x\n",
1704                                 hmp->fchain.flags,
1705                                 hmp->fchain.update_xlo,
1706                                 hmp->fchain.update_xhi);
1707
1708                         if (hammer2_debug & 0x0010)
1709                                 Debugger("entered debugger");
1710                 }
1711         }
1712 }
1713
1714 static
1715 void
1716 hammer2_vfs_unmount_hmp2(struct mount *mp, hammer2_mount_t *hmp)
1717 {
1718         hammer2_pfsmount_t *spmp;
1719         struct vnode *devvp;
1720         int dumpcnt;
1721         int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
1722
1723         /*
1724          * If no PFS's left drop the master hammer2_mount for the
1725          * device.
1726          */
1727         if (hmp->pmp_count == 0) {
1728                 /*
1729                  * Clean up SPMP and the super-root inode
1730                  */
1731                 spmp = hmp->spmp;
1732                 if (spmp) {
1733                         if (spmp->iroot) {
1734                                 hammer2_inode_drop(spmp->iroot);
1735                                 spmp->iroot = NULL;
1736                         }
1737                         hmp->spmp = NULL;
1738                         kmalloc_destroy(&spmp->mmsg);
1739                         kmalloc_destroy(&spmp->minode);
1740                         kfree(spmp, M_HAMMER2);
1741                 }
1742
1743                 /*
1744                  * Finish up with the device vnode
1745                  */
1746                 if ((devvp = hmp->devvp) != NULL) {
1747                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1748                         vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1749                         hmp->devvp = NULL;
1750                         VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL);
1751                         vn_unlock(devvp);
1752                         vrele(devvp);
1753                         devvp = NULL;
1754                 }
1755
1756                 /*
1757                  * Clear vchain/fchain flags that might prevent final cleanup
1758                  * of these chains.
1759                  */
1760                 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) {
1761                         atomic_clear_int(&hmp->vchain.flags,
1762                                          HAMMER2_CHAIN_MODIFIED);
1763                         hammer2_chain_drop(&hmp->vchain);
1764                 }
1765                 if (hmp->vchain.flags & HAMMER2_CHAIN_FLUSH_CREATE) {
1766                         atomic_clear_int(&hmp->vchain.flags,
1767                                          HAMMER2_CHAIN_FLUSH_CREATE);
1768                         hammer2_chain_drop(&hmp->vchain);
1769                 }
1770                 if (hmp->vchain.flags & HAMMER2_CHAIN_FLUSH_DELETE) {
1771                         atomic_clear_int(&hmp->vchain.flags,
1772                                          HAMMER2_CHAIN_FLUSH_DELETE);
1773                         hammer2_chain_drop(&hmp->vchain);
1774                 }
1775
1776                 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) {
1777                         atomic_clear_int(&hmp->fchain.flags,
1778                                          HAMMER2_CHAIN_MODIFIED);
1779                         hammer2_chain_drop(&hmp->fchain);
1780                 }
1781                 if (hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_CREATE) {
1782                         atomic_clear_int(&hmp->fchain.flags,
1783                                          HAMMER2_CHAIN_FLUSH_CREATE);
1784                         hammer2_chain_drop(&hmp->fchain);
1785                 }
1786                 if (hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_DELETE) {
1787                         atomic_clear_int(&hmp->fchain.flags,
1788                                          HAMMER2_CHAIN_FLUSH_DELETE);
1789                         hammer2_chain_drop(&hmp->fchain);
1790                 }
1791
1792                 /*
1793                  * Final drop of embedded freemap root chain to
1794                  * clean up fchain.core (fchain structure is not
1795                  * flagged ALLOCATED so it is cleaned out and then
1796                  * left to rot).
1797                  */
1798                 hammer2_chain_drop(&hmp->fchain);
1799
1800                 /*
1801                  * Final drop of embedded volume root chain to clean
1802                  * up vchain.core (vchain structure is not flagged
1803                  * ALLOCATED so it is cleaned out and then left to
1804                  * rot).
1805                  */
1806                 dumpcnt = 50;
1807                 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v');
1808                 dumpcnt = 50;
1809                 hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f');
1810                 hammer2_mount_unlock(hmp);
1811                 hammer2_chain_drop(&hmp->vchain);
1812
1813                 hammer2_io_cleanup(hmp, &hmp->iotree);
1814                 if (hmp->iofree_count) {
1815                         kprintf("io_cleanup: %d I/O's left hanging\n",
1816                                 hmp->iofree_count);
1817                 }
1818
1819                 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1820                 kmalloc_destroy(&hmp->mchain);
1821                 kfree(hmp, M_HAMMER2);
1822         } else {
1823                 hammer2_mount_unlock(hmp);
1824         }
1825 }
1826
1827 static
1828 int
1829 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1830              ino_t ino, struct vnode **vpp)
1831 {
1832         kprintf("hammer2_vget\n");
1833         return (EOPNOTSUPP);
1834 }
1835
1836 static
1837 int
1838 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1839 {
1840         hammer2_pfsmount_t *pmp;
1841         hammer2_cluster_t *cparent;
1842         int error;
1843         struct vnode *vp;
1844
1845         pmp = MPTOPMP(mp);
1846         if (pmp->iroot == NULL) {
1847                 *vpp = NULL;
1848                 error = EINVAL;
1849         } else {
1850                 cparent = hammer2_inode_lock_sh(pmp->iroot);
1851                 vp = hammer2_igetv(pmp->iroot, cparent, &error);
1852                 hammer2_inode_unlock_sh(pmp->iroot, cparent);
1853                 *vpp = vp;
1854                 if (vp == NULL)
1855                         kprintf("vnodefail\n");
1856         }
1857
1858         return (error);
1859 }
1860
1861 /*
1862  * Filesystem status
1863  *
1864  * XXX incorporate ipdata->inode_quota and data_quota
1865  */
1866 static
1867 int
1868 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1869 {
1870         hammer2_pfsmount_t *pmp;
1871         hammer2_mount_t *hmp;
1872
1873         pmp = MPTOPMP(mp);
1874         KKASSERT(pmp->iroot->cluster.nchains >= 1);
1875         hmp = pmp->iroot->cluster.focus->hmp;   /* XXX */
1876
1877         mp->mnt_stat.f_files = pmp->inode_count;
1878         mp->mnt_stat.f_ffree = 0;
1879         mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
1880         mp->mnt_stat.f_bfree =  hmp->voldata.allocator_free / HAMMER2_PBUFSIZE;
1881         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1882
1883         *sbp = mp->mnt_stat;
1884         return (0);
1885 }
1886
1887 static
1888 int
1889 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1890 {
1891         hammer2_pfsmount_t *pmp;
1892         hammer2_mount_t *hmp;
1893
1894         pmp = MPTOPMP(mp);
1895         KKASSERT(pmp->iroot->cluster.nchains >= 1);
1896         hmp = pmp->iroot->cluster.focus->hmp;   /* XXX */
1897
1898         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1899         mp->mnt_vstat.f_files = pmp->inode_count;
1900         mp->mnt_vstat.f_ffree = 0;
1901         mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
1902         mp->mnt_vstat.f_bfree =  hmp->voldata.allocator_free / HAMMER2_PBUFSIZE;
1903         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1904
1905         *sbp = mp->mnt_vstat;
1906         return (0);
1907 }
1908
1909 /*
1910  * Mount-time recovery (RW mounts)
1911  *
1912  * Updates to the free block table are allowed to lag flushes by one
1913  * transaction.  In case of a crash, then on a fresh mount we must do an
1914  * incremental scan of the last committed transaction id and make sure that
1915  * all related blocks have been marked allocated.
1916  *
1917  * The super-root topology and each PFS has its own transaction id domain,
1918  * so we must track PFS boundary transitions.
1919  */
1920 struct hammer2_recovery_elm {
1921         TAILQ_ENTRY(hammer2_recovery_elm) entry;
1922         hammer2_chain_t *chain;
1923         hammer2_tid_t sync_tid;
1924 };
1925
1926 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm);
1927
1928 struct hammer2_recovery_info {
1929         struct hammer2_recovery_list list;
1930         int     depth;
1931 };
1932
1933 static int hammer2_recovery_scan(hammer2_trans_t *trans, hammer2_mount_t *hmp,
1934                         hammer2_chain_t *parent,
1935                         struct hammer2_recovery_info *info,
1936                         hammer2_tid_t sync_tid);
1937
1938 #define HAMMER2_RECOVERY_MAXDEPTH       10
1939
1940 static
1941 int
1942 hammer2_recovery(hammer2_mount_t *hmp)
1943 {
1944         hammer2_trans_t trans;
1945         struct hammer2_recovery_info info;
1946         struct hammer2_recovery_elm *elm;
1947         hammer2_chain_t *parent;
1948         hammer2_tid_t sync_tid;
1949         int error;
1950         int cumulative_error = 0;
1951
1952         hammer2_trans_init(&trans, hmp->spmp, 0);
1953
1954         sync_tid = 0;
1955         TAILQ_INIT(&info.list);
1956         info.depth = 0;
1957         parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1958         cumulative_error = hammer2_recovery_scan(&trans, hmp, parent,
1959                                                  &info, sync_tid);
1960         hammer2_chain_lookup_done(parent);
1961
1962         while ((elm = TAILQ_FIRST(&info.list)) != NULL) {
1963                 TAILQ_REMOVE(&info.list, elm, entry);
1964                 parent = elm->chain;
1965                 sync_tid = elm->sync_tid;
1966                 kfree(elm, M_HAMMER2);
1967
1968                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS |
1969                                            HAMMER2_RESOLVE_NOREF);
1970                 error = hammer2_recovery_scan(&trans, hmp, parent,
1971                                               &info, sync_tid);
1972                 hammer2_chain_unlock(parent);
1973                 if (error)
1974                         cumulative_error = error;
1975         }
1976         hammer2_trans_done(&trans);
1977
1978         return cumulative_error;
1979 }
1980
1981 static
1982 int
1983 hammer2_recovery_scan(hammer2_trans_t *trans, hammer2_mount_t *hmp,
1984                       hammer2_chain_t *parent,
1985                       struct hammer2_recovery_info *info,
1986                       hammer2_tid_t sync_tid)
1987 {
1988         hammer2_chain_t *chain;
1989         int cache_index;
1990         int cumulative_error = 0;
1991         int pfs_boundary = 0;
1992         int error;
1993
1994         /*
1995          * Adjust freemap to ensure that the block(s) are marked allocated.
1996          */
1997         if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) {
1998                 hammer2_freemap_adjust(trans, hmp, &parent->bref,
1999                                        HAMMER2_FREEMAP_DORECOVER);
2000         }
2001
2002         /*
2003          * Check type for recursive scan
2004          */
2005         switch(parent->bref.type) {
2006         case HAMMER2_BREF_TYPE_VOLUME:
2007                 /* data already instantiated */
2008                 break;
2009         case HAMMER2_BREF_TYPE_INODE:
2010                 /*
2011                  * Must instantiate data for DIRECTDATA test and also
2012                  * for recursion.
2013                  */
2014                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2015                 if (parent->data->ipdata.op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
2016                         /* not applicable to recovery scan */
2017                         hammer2_chain_unlock(parent);
2018                         return 0;
2019                 }
2020                 if ((parent->data->ipdata.op_flags & HAMMER2_OPFLAG_PFSROOT) &&
2021                     info->depth != 0) {
2022                         pfs_boundary = 1;
2023                         sync_tid = parent->bref.mirror_tid - 1;
2024                 }
2025                 hammer2_chain_unlock(parent);
2026                 break;
2027         case HAMMER2_BREF_TYPE_INDIRECT:
2028                 /*
2029                  * Must instantiate data for recursion
2030                  */
2031                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2032                 hammer2_chain_unlock(parent);
2033                 break;
2034         case HAMMER2_BREF_TYPE_DATA:
2035         case HAMMER2_BREF_TYPE_FREEMAP:
2036         case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2037         case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
2038                 /* not applicable to recovery scan */
2039                 return 0;
2040                 break;
2041         default:
2042                 return EDOM;
2043         }
2044
2045         /*
2046          * Defer operation if depth limit reached or if we are crossing a
2047          * PFS boundary.
2048          */
2049         if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH || pfs_boundary) {
2050                 struct hammer2_recovery_elm *elm;
2051
2052                 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK);
2053                 elm->chain = parent;
2054                 elm->sync_tid = sync_tid;
2055                 hammer2_chain_ref(parent);
2056                 TAILQ_INSERT_TAIL(&info->list, elm, entry);
2057                 /* unlocked by caller */
2058
2059                 return(0);
2060         }
2061
2062
2063         /*
2064          * Recursive scan of the last flushed transaction only.  We are
2065          * doing this without pmp assignments so don't leave the chains
2066          * hanging around after we are done with them.
2067          */
2068         cache_index = 0;
2069         chain = hammer2_chain_scan(parent, NULL, &cache_index,
2070                                    HAMMER2_LOOKUP_NODATA);
2071         while (chain) {
2072                 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
2073                 if (chain->bref.mirror_tid >= sync_tid) {
2074                         ++info->depth;
2075                         error = hammer2_recovery_scan(trans, hmp, chain,
2076                                                       info, sync_tid);
2077                         --info->depth;
2078                         if (error)
2079                                 cumulative_error = error;
2080                 }
2081                 chain = hammer2_chain_scan(parent, chain, &cache_index,
2082                                            HAMMER2_LOOKUP_NODATA);
2083         }
2084
2085         return cumulative_error;
2086 }
2087
2088 /*
2089  * Sync the entire filesystem; this is called from the filesystem syncer
2090  * process periodically and whenever a user calls sync(1) on the hammer
2091  * mountpoint.
2092  *
2093  * Currently is actually called from the syncer! \o/
2094  *
2095  * This task will have to snapshot the state of the dirty inode chain.
2096  * From that, it will have to make sure all of the inodes on the dirty
2097  * chain have IO initiated. We make sure that io is initiated for the root
2098  * block.
2099  *
2100  * If waitfor is set, we wait for media to acknowledge the new rootblock.
2101  *
2102  * THINKS: side A vs side B, to have sync not stall all I/O?
2103  */
2104 int
2105 hammer2_vfs_sync(struct mount *mp, int waitfor)
2106 {
2107         struct hammer2_sync_info info;
2108         hammer2_inode_t *iroot;
2109         hammer2_chain_t *chain;
2110         hammer2_chain_t *parent;
2111         hammer2_pfsmount_t *pmp;
2112         hammer2_mount_t *hmp;
2113         int flags;
2114         int error;
2115         int total_error;
2116         int force_fchain;
2117         int i;
2118         int j;
2119
2120         pmp = MPTOPMP(mp);
2121         iroot = pmp->iroot;
2122         KKASSERT(iroot);
2123         KKASSERT(iroot->pmp == pmp);
2124
2125         /*
2126          * We can't acquire locks on existing vnodes while in a transaction
2127          * without risking a deadlock.  This assumes that vfsync() can be
2128          * called without the vnode locked (which it can in DragonFly).
2129          * Otherwise we'd have to implement a multi-pass or flag the lock
2130          * failures and retry.
2131          *
2132          * The reclamation code interlocks with the sync list's token
2133          * (by removing the vnode from the scan list) before unlocking
2134          * the inode, giving us time to ref the inode.
2135          */
2136         /*flags = VMSC_GETVP;*/
2137         flags = 0;
2138         if (waitfor & MNT_LAZY)
2139                 flags |= VMSC_ONEPASS;
2140
2141         /*
2142          * Start our flush transaction.  This does not return until all
2143          * concurrent transactions have completed and will prevent any
2144          * new transactions from running concurrently, except for the
2145          * buffer cache transactions.
2146          *
2147          * For efficiency do an async pass before making sure with a
2148          * synchronous pass on all related buffer cache buffers.  It
2149          * should theoretically not be possible for any new file buffers
2150          * to be instantiated during this sequence.
2151          */
2152         hammer2_trans_init(&info.trans, pmp, HAMMER2_TRANS_ISFLUSH |
2153                                              HAMMER2_TRANS_PREFLUSH);
2154         hammer2_run_unlinkq(&info.trans, pmp);
2155
2156         info.error = 0;
2157         info.waitfor = MNT_NOWAIT;
2158         vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2159         info.waitfor = MNT_WAIT;
2160         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2161
2162         /*
2163          * Clear PREFLUSH.  This prevents (or asserts on) any new logical
2164          * buffer cache flushes which occur during the flush.  Device buffers
2165          * are not affected.
2166          */
2167
2168 #if 0
2169         if (info.error == 0 && (waitfor & MNT_WAIT)) {
2170                 info.waitfor = waitfor;
2171                     vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2172
2173         }
2174 #endif
2175         hammer2_bioq_sync(info.trans.pmp);
2176         atomic_clear_int(&info.trans.flags, HAMMER2_TRANS_PREFLUSH);
2177
2178         total_error = 0;
2179
2180         /*
2181          * Flush all storage elements making up the cluster
2182          *
2183          * We must also flush any deleted siblings because the super-root
2184          * flush won't do it for us.  They all must be staged or the
2185          * super-root flush will not be able to update its block table
2186          * properly.
2187          *
2188          * XXX currently done serially instead of concurrently
2189          */
2190         for (i = 0; iroot && i < iroot->cluster.nchains; ++i) {
2191                 chain = iroot->cluster.array[i];
2192                 if (chain) {
2193                         hammer2_chain_lock(chain, HAMMER2_RESOLVE_ALWAYS);
2194                         hammer2_flush(&info.trans, &chain);
2195                         hammer2_chain_unlock(chain);
2196                 }
2197                 if (chain) {
2198                         hammer2_chain_t *nchain;
2199                         chain = TAILQ_FIRST(&chain->core->ownerq);
2200                         hammer2_chain_ref(chain);
2201                         while (chain) {
2202                                 hammer2_chain_lock(chain,
2203                                                    HAMMER2_RESOLVE_ALWAYS);
2204                                 hammer2_flush(&info.trans, &chain);
2205                                 hammer2_chain_unlock(chain);
2206                                 nchain = TAILQ_NEXT(chain, core_entry);
2207                                 if (nchain)
2208                                         hammer2_chain_ref(nchain);
2209                                 hammer2_chain_drop(chain);
2210                                 chain = nchain;
2211                         }
2212                 }
2213         }
2214 #if 0
2215         hammer2_trans_done(&info.trans);
2216 #endif
2217
2218         /*
2219          * Flush all volume roots to synchronize PFS flushes with the
2220          * storage media.  Use a super-root transaction for each one.
2221          *
2222          * The flush code will detect super-root -> pfs-root chain
2223          * transitions using the last pfs-root flush.
2224          */
2225         for (i = 0; iroot && i < iroot->cluster.nchains; ++i) {
2226                 chain = iroot->cluster.array[i];
2227                 if (chain == NULL)
2228                         continue;
2229
2230                 hmp = chain->hmp;
2231
2232                 /*
2233                  * We only have to flush each hmp once
2234                  */
2235                 for (j = i - 1; j >= 0; --j) {
2236                         if (iroot->cluster.array[j] &&
2237                             iroot->cluster.array[j]->hmp == hmp)
2238                                 break;
2239                 }
2240                 if (j >= 0)
2241                         continue;
2242                 hammer2_trans_spmp(&info.trans, hmp->spmp);
2243
2244                 /*
2245                  * Force an update of the XID from the PFS root to the
2246                  * topology root.  We couldn't do this from the PFS
2247                  * transaction because a SPMP transaction is needed.
2248                  * This does not modify blocks, instead what it does is
2249                  * allow the flush code to find the transition point and
2250                  * then update on the way back up.
2251                  */
2252                 parent = TAILQ_LAST(&chain->above->ownerq, h2_core_list);
2253                 KKASSERT(chain->pmp != parent->pmp);
2254                 hammer2_chain_setsubmod(&info.trans, parent);
2255
2256                 /*
2257                  * Media mounts have two 'roots', vchain for the topology
2258                  * and fchain for the free block table.  Flush both.
2259                  *
2260                  * Note that the topology and free block table are handled
2261                  * independently, so the free block table can wind up being
2262                  * ahead of the topology.  We depend on the bulk free scan
2263                  * code to deal with any loose ends.
2264                  */
2265                 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
2266                 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
2267                 if ((hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) ||
2268                     hmp->fchain.update_xhi > hmp->fchain.update_xlo) {
2269                         /*
2270                          * This will also modify vchain as a side effect,
2271                          * mark vchain as modified now.
2272                          */
2273                         hammer2_voldata_modify(hmp);
2274                         chain = &hmp->fchain;
2275                         hammer2_flush(&info.trans, &chain);
2276                         KKASSERT(chain == &hmp->fchain);
2277                 }
2278                 hammer2_chain_unlock(&hmp->fchain);
2279                 hammer2_chain_unlock(&hmp->vchain);
2280
2281                 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
2282                 if ((hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) ||
2283                     hmp->vchain.update_xhi > hmp->vchain.update_xlo) {
2284                         chain = &hmp->vchain;
2285                         hammer2_flush(&info.trans, &chain);
2286                         KKASSERT(chain == &hmp->vchain);
2287                         force_fchain = 1;
2288                 } else {
2289                         force_fchain = 0;
2290                 }
2291                 hammer2_chain_unlock(&hmp->vchain);
2292
2293 #if 0
2294                 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
2295                 if ((hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) ||
2296                     hmp->fchain.update_xhi > hmp->fchain.update_xlo ||
2297                     force_fchain) {
2298                         /* this will also modify vchain as a side effect */
2299                         chain = &hmp->fchain;
2300                         hammer2_flush(&info.trans, &chain);
2301                         KKASSERT(chain == &hmp->fchain);
2302                 }
2303                 hammer2_chain_unlock(&hmp->fchain);
2304 #endif
2305
2306                 error = 0;
2307
2308                 /*
2309                  * We can't safely flush the volume header until we have
2310                  * flushed any device buffers which have built up.
2311                  *
2312                  * XXX this isn't being incremental
2313                  */
2314                 vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
2315                 error = VOP_FSYNC(hmp->devvp, MNT_WAIT, 0);
2316                 vn_unlock(hmp->devvp);
2317
2318                 /*
2319                  * The flush code sets CHAIN_VOLUMESYNC to indicate that the
2320                  * volume header needs synchronization via hmp->volsync.
2321                  *
2322                  * XXX synchronize the flag & data with only this flush XXX
2323                  */
2324                 if (error == 0 &&
2325                     (hmp->vchain.flags & HAMMER2_CHAIN_VOLUMESYNC)) {
2326                         struct buf *bp;
2327
2328                         /*
2329                          * Synchronize the disk before flushing the volume
2330                          * header.
2331                          */
2332                         bp = getpbuf(NULL);
2333                         bp->b_bio1.bio_offset = 0;
2334                         bp->b_bufsize = 0;
2335                         bp->b_bcount = 0;
2336                         bp->b_cmd = BUF_CMD_FLUSH;
2337                         bp->b_bio1.bio_done = biodone_sync;
2338                         bp->b_bio1.bio_flags |= BIO_SYNC;
2339                         vn_strategy(hmp->devvp, &bp->b_bio1);
2340                         biowait(&bp->b_bio1, "h2vol");
2341                         relpbuf(bp, NULL);
2342
2343                         /*
2344                          * Then we can safely flush the version of the
2345                          * volume header synchronized by the flush code.
2346                          */
2347                         i = hmp->volhdrno + 1;
2348                         if (i >= HAMMER2_NUM_VOLHDRS)
2349                                 i = 0;
2350                         if (i * HAMMER2_ZONE_BYTES64 + HAMMER2_SEGSIZE >
2351                             hmp->volsync.volu_size) {
2352                                 i = 0;
2353                         }
2354                         kprintf("sync volhdr %d %jd\n",
2355                                 i, (intmax_t)hmp->volsync.volu_size);
2356                         bp = getblk(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2357                                     HAMMER2_PBUFSIZE, 0, 0);
2358                         atomic_clear_int(&hmp->vchain.flags,
2359                                          HAMMER2_CHAIN_VOLUMESYNC);
2360                         bcopy(&hmp->volsync, bp->b_data, HAMMER2_PBUFSIZE);
2361                         bawrite(bp);
2362                         hmp->volhdrno = i;
2363                 }
2364                 if (error)
2365                         total_error = error;
2366
2367 #if 0
2368                 hammer2_trans_done(&info.trans);
2369 #endif
2370         }
2371         hammer2_trans_done(&info.trans);
2372
2373         return (total_error);
2374 }
2375
2376 /*
2377  * Sync passes.
2378  */
2379 static int
2380 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
2381 {
2382         struct hammer2_sync_info *info = data;
2383         hammer2_inode_t *ip;
2384         int error;
2385
2386         /*
2387          *
2388          */
2389         ip = VTOI(vp);
2390         if (ip == NULL)
2391                 return(0);
2392         if (vp->v_type == VNON || vp->v_type == VBAD) {
2393                 vclrisdirty(vp);
2394                 return(0);
2395         }
2396         if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
2397             RB_EMPTY(&vp->v_rbdirty_tree)) {
2398                 vclrisdirty(vp);
2399                 return(0);
2400         }
2401
2402         /*
2403          * VOP_FSYNC will start a new transaction so replicate some code
2404          * here to do it inline (see hammer2_vop_fsync()).
2405          *
2406          * WARNING: The vfsync interacts with the buffer cache and might
2407          *          block, we can't hold the inode lock at that time.
2408          *          However, we MUST ref ip before blocking to ensure that
2409          *          it isn't ripped out from under us (since we do not
2410          *          hold a lock on the vnode).
2411          */
2412         hammer2_inode_ref(ip);
2413         atomic_clear_int(&ip->flags, HAMMER2_INODE_MODIFIED);
2414         if (vp)
2415                 vfsync(vp, MNT_NOWAIT, 1, NULL, NULL);
2416
2417         hammer2_inode_drop(ip);
2418 #if 1
2419         error = 0;
2420         if (error)
2421                 info->error = error;
2422 #endif
2423         return(0);
2424 }
2425
2426 static
2427 int
2428 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
2429 {
2430         return (0);
2431 }
2432
2433 static
2434 int
2435 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
2436                struct fid *fhp, struct vnode **vpp)
2437 {
2438         return (0);
2439 }
2440
2441 static
2442 int
2443 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
2444                  int *exflagsp, struct ucred **credanonp)
2445 {
2446         return (0);
2447 }
2448
2449 /*
2450  * Support code for hammer2_mount().  Read, verify, and install the volume
2451  * header into the HMP
2452  *
2453  * XXX read four volhdrs and use the one with the highest TID whos CRC
2454  *     matches.
2455  *
2456  * XXX check iCRCs.
2457  *
2458  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
2459  *     nonexistant locations.
2460  *
2461  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
2462  */
2463 static
2464 int
2465 hammer2_install_volume_header(hammer2_mount_t *hmp)
2466 {
2467         hammer2_volume_data_t *vd;
2468         struct buf *bp;
2469         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
2470         int error_reported;
2471         int error;
2472         int valid;
2473         int i;
2474
2475         error_reported = 0;
2476         error = 0;
2477         valid = 0;
2478         bp = NULL;
2479
2480         /*
2481          * There are up to 4 copies of the volume header (syncs iterate
2482          * between them so there is no single master).  We don't trust the
2483          * volu_size field so we don't know precisely how large the filesystem
2484          * is, so depend on the OS to return an error if we go beyond the
2485          * block device's EOF.
2486          */
2487         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
2488                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2489                               HAMMER2_VOLUME_BYTES, &bp);
2490                 if (error) {
2491                         brelse(bp);
2492                         bp = NULL;
2493                         continue;
2494                 }
2495
2496                 vd = (struct hammer2_volume_data *) bp->b_data;
2497                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
2498                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
2499                         brelse(bp);
2500                         bp = NULL;
2501                         continue;
2502                 }
2503
2504                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
2505                         /* XXX: Reversed-endianness filesystem */
2506                         kprintf("hammer2: reverse-endian filesystem detected");
2507                         brelse(bp);
2508                         bp = NULL;
2509                         continue;
2510                 }
2511
2512                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
2513                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
2514                                       HAMMER2_VOLUME_ICRC0_SIZE);
2515                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
2516                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
2517                                        HAMMER2_VOLUME_ICRC1_SIZE);
2518                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
2519                         kprintf("hammer2 volume header crc "
2520                                 "mismatch copy #%d %08x/%08x\n",
2521                                 i, crc0, crc);
2522                         error_reported = 1;
2523                         brelse(bp);
2524                         bp = NULL;
2525                         continue;
2526                 }
2527                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
2528                         valid = 1;
2529                         hmp->voldata = *vd;
2530                         hmp->volhdrno = i;
2531                 }
2532                 brelse(bp);
2533                 bp = NULL;
2534         }
2535         if (valid) {
2536                 hmp->volsync = hmp->voldata;
2537                 error = 0;
2538                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
2539                         kprintf("hammer2: using volume header #%d\n",
2540                                 hmp->volhdrno);
2541                 }
2542         } else {
2543                 error = EINVAL;
2544                 kprintf("hammer2: no valid volume headers found!\n");
2545         }
2546         return (error);
2547 }
2548
2549 /*
2550  * Reconnect using the passed file pointer.  The caller must ref the
2551  * fp for us.
2552  */
2553 void
2554 hammer2_cluster_reconnect(hammer2_mount_t *hmp, struct file *fp)
2555 {
2556         size_t name_len;
2557         const char *name = "disk-volume";
2558
2559         /*
2560          * Closes old comm descriptor, kills threads, cleans up
2561          * states, then installs the new descriptor and creates
2562          * new threads.
2563          */
2564         kdmsg_iocom_reconnect(&hmp->iocom, fp, "hammer2");
2565
2566         /*
2567          * Setup LNK_CONN fields for autoinitiated state machine.  We
2568          * will use SPANs to advertise multiple PFSs so only pass the
2569          * fsid and HAMMER2_PFSTYPE_SUPROOT for the AUTOCONN.
2570          *
2571          * We are not initiating a LNK_SPAN so we do not have to set-up
2572          * iocom.auto_lnk_span.
2573          */
2574         bzero(&hmp->iocom.auto_lnk_conn.pfs_clid,
2575               sizeof(hmp->iocom.auto_lnk_conn.pfs_clid));
2576         hmp->iocom.auto_lnk_conn.pfs_fsid = hmp->voldata.fsid;
2577         hmp->iocom.auto_lnk_conn.pfs_type = HAMMER2_PFSTYPE_SUPROOT;
2578         hmp->iocom.auto_lnk_conn.proto_version = DMSG_SPAN_PROTO_1;
2579 #if 0
2580         hmp->iocom.auto_lnk_conn.peer_type = hmp->voldata.peer_type;
2581 #endif
2582         hmp->iocom.auto_lnk_conn.peer_type = DMSG_PEER_HAMMER2;
2583
2584         /*
2585          * Filter adjustment.  Clients do not need visibility into other
2586          * clients (otherwise millions of clients would present a serious
2587          * problem).  The fs_label also serves to restrict the namespace.
2588          */
2589         hmp->iocom.auto_lnk_conn.peer_mask = 1LLU << DMSG_PEER_HAMMER2;
2590         hmp->iocom.auto_lnk_conn.pfs_mask = (uint64_t)-1;
2591
2592 #if 0
2593         switch (ipdata->pfs_type) {
2594         case DMSG_PFSTYPE_CLIENT:
2595                 hmp->iocom.auto_lnk_conn.peer_mask &=
2596                                 ~(1LLU << DMSG_PFSTYPE_CLIENT);
2597                 break;
2598         default:
2599                 break;
2600         }
2601 #endif
2602
2603         name_len = strlen(name);
2604         if (name_len >= sizeof(hmp->iocom.auto_lnk_conn.fs_label))
2605                 name_len = sizeof(hmp->iocom.auto_lnk_conn.fs_label) - 1;
2606         bcopy(name, hmp->iocom.auto_lnk_conn.fs_label, name_len);
2607         hmp->iocom.auto_lnk_conn.fs_label[name_len] = 0;
2608
2609         kdmsg_iocom_autoinitiate(&hmp->iocom, hammer2_autodmsg);
2610 }
2611
2612 static int
2613 hammer2_rcvdmsg(kdmsg_msg_t *msg)
2614 {
2615         kprintf("RCVMSG %08x\n", msg->tcmd);
2616
2617         switch(msg->tcmd) {
2618         case DMSG_DBG_SHELL:
2619                 /*
2620                  * (non-transaction)
2621                  * Execute shell command (not supported atm)
2622                  */
2623                 kdmsg_msg_result(msg, DMSG_ERR_NOSUPP);
2624                 break;
2625         case DMSG_DBG_SHELL | DMSGF_REPLY:
2626                 /*
2627                  * (non-transaction)
2628                  */
2629                 if (msg->aux_data) {
2630                         msg->aux_data[msg->aux_size - 1] = 0;
2631                         kprintf("HAMMER2 DBG: %s\n", msg->aux_data);
2632                 }
2633                 break;
2634         default:
2635                 /*
2636                  * Unsupported message received.  We only need to
2637                  * reply if it's a transaction in order to close our end.
2638                  * Ignore any one-way messages or any further messages
2639                  * associated with the transaction.
2640                  *
2641                  * NOTE: This case also includes DMSG_LNK_ERROR messages
2642                  *       which might be one-way, replying to those would
2643                  *       cause an infinite ping-pong.
2644                  */
2645                 if (msg->any.head.cmd & DMSGF_CREATE)
2646                         kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
2647                 break;
2648         }
2649         return(0);
2650 }
2651
2652 /*
2653  * This function is called after KDMSG has automatically handled processing
2654  * of a LNK layer message (typically CONN, SPAN, or CIRC).
2655  *
2656  * We tag off the LNK_CONN to trigger our LNK_VOLCONF messages which
2657  * advertises all available hammer2 super-root volumes.
2658  */
2659 static void
2660 hammer2_autodmsg(kdmsg_msg_t *msg)
2661 {
2662         hammer2_mount_t *hmp = msg->iocom->handle;
2663         int copyid;
2664
2665         kprintf("RCAMSG %08x\n", msg->tcmd);
2666
2667         switch(msg->tcmd) {
2668         case DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_REPLY:
2669         case DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_DELETE | DMSGF_REPLY:
2670                 if (msg->any.head.cmd & DMSGF_CREATE) {
2671                         kprintf("HAMMER2: VOLDATA DUMP\n");
2672
2673                         /*
2674                          * Dump the configuration stored in the volume header.
2675                          * This will typically be import/export access rights,
2676                          * master encryption keys (encrypted), etc.
2677                          */
2678                         hammer2_voldata_lock(hmp);
2679                         copyid = 0;
2680                         while (copyid < HAMMER2_COPYID_COUNT) {
2681                                 if (hmp->voldata.copyinfo[copyid].copyid)
2682                                         hammer2_volconf_update(hmp, copyid);
2683                                 ++copyid;
2684                         }
2685                         hammer2_voldata_unlock(hmp);
2686
2687                         kprintf("HAMMER2: INITIATE SPANs\n");
2688                         hammer2_update_spans(hmp);
2689                 }
2690                 if ((msg->any.head.cmd & DMSGF_DELETE) &&
2691                     msg->state && (msg->state->txcmd & DMSGF_DELETE) == 0) {
2692                         kprintf("HAMMER2: CONN WAS TERMINATED\n");
2693                 }
2694                 break;
2695         default:
2696                 break;
2697         }
2698 }
2699
2700 /*
2701  * Update LNK_SPAN state
2702  */
2703 void
2704 hammer2_update_spans(hammer2_mount_t *hmp)
2705 {
2706         const hammer2_inode_data_t *ipdata;
2707         hammer2_cluster_t *cparent;
2708         hammer2_cluster_t *cluster;
2709         hammer2_pfsmount_t *spmp;
2710         hammer2_key_t key_next;
2711         kdmsg_msg_t *rmsg;
2712         size_t name_len;
2713         int ddflag;
2714
2715         /*
2716          * Lookup mount point under the media-localized super-root.
2717          *
2718          * cluster->pmp will incorrectly point to spmp and must be fixed
2719          * up later on.
2720          */
2721         spmp = hmp->spmp;
2722         cparent = hammer2_inode_lock_ex(spmp->iroot);
2723         cluster = hammer2_cluster_lookup(cparent, &key_next,
2724                                          HAMMER2_KEY_MIN,
2725                                          HAMMER2_KEY_MAX,
2726                                          0, &ddflag);
2727         while (cluster) {
2728                 if (hammer2_cluster_type(cluster) != HAMMER2_BREF_TYPE_INODE)
2729                         continue;
2730                 ipdata = &hammer2_cluster_data(cluster)->ipdata;
2731                 kprintf("UPDATE SPANS: %s\n", ipdata->filename);
2732
2733                 rmsg = kdmsg_msg_alloc(&hmp->iocom, NULL,
2734                                        DMSG_LNK_SPAN | DMSGF_CREATE,
2735                                        hammer2_lnk_span_reply, NULL);
2736                 rmsg->any.lnk_span.pfs_clid = ipdata->pfs_clid;
2737                 rmsg->any.lnk_span.pfs_fsid = ipdata->pfs_fsid;
2738                 rmsg->any.lnk_span.pfs_type = ipdata->pfs_type;
2739                 rmsg->any.lnk_span.peer_type = DMSG_PEER_HAMMER2;
2740                 rmsg->any.lnk_span.proto_version = DMSG_SPAN_PROTO_1;
2741                 name_len = ipdata->name_len;
2742                 if (name_len >= sizeof(rmsg->any.lnk_span.fs_label))
2743                         name_len = sizeof(rmsg->any.lnk_span.fs_label) - 1;
2744                 bcopy(ipdata->filename, rmsg->any.lnk_span.fs_label, name_len);
2745
2746                 kdmsg_msg_write(rmsg);
2747
2748                 cluster = hammer2_cluster_next(cparent, cluster,
2749                                                &key_next,
2750                                                key_next,
2751                                                HAMMER2_KEY_MAX,
2752                                                0);
2753         }
2754         hammer2_inode_unlock_ex(spmp->iroot, cparent);
2755 }
2756
2757 static
2758 int
2759 hammer2_lnk_span_reply(kdmsg_state_t *state, kdmsg_msg_t *msg)
2760 {
2761         if ((state->txcmd & DMSGF_DELETE) == 0 &&
2762             (msg->any.head.cmd & DMSGF_DELETE)) {
2763                 kdmsg_msg_reply(msg, 0);
2764         }
2765         return 0;
2766 }
2767
2768 /*
2769  * Volume configuration updates are passed onto the userland service
2770  * daemon via the open LNK_CONN transaction.
2771  */
2772 void
2773 hammer2_volconf_update(hammer2_mount_t *hmp, int index)
2774 {
2775         kdmsg_msg_t *msg;
2776
2777         /* XXX interlock against connection state termination */
2778         kprintf("volconf update %p\n", hmp->iocom.conn_state);
2779         if (hmp->iocom.conn_state) {
2780                 kprintf("TRANSMIT VOLCONF VIA OPEN CONN TRANSACTION\n");
2781                 msg = kdmsg_msg_alloc_state(hmp->iocom.conn_state,
2782                                             DMSG_LNK_HAMMER2_VOLCONF,
2783                                             NULL, NULL);
2784                 H2_LNK_VOLCONF(msg)->copy = hmp->voldata.copyinfo[index];
2785                 H2_LNK_VOLCONF(msg)->mediaid = hmp->voldata.fsid;
2786                 H2_LNK_VOLCONF(msg)->index = index;
2787                 kdmsg_msg_write(msg);
2788         }
2789 }
2790
2791 /*
2792  * This handles hysteresis on regular file flushes.  Because the BIOs are
2793  * routed to a thread it is possible for an excessive number to build up
2794  * and cause long front-end stalls long before the runningbuffspace limit
2795  * is hit, so we implement hammer2_flush_pipe to control the
2796  * hysteresis.
2797  *
2798  * This is a particular problem when compression is used.
2799  */
2800 void
2801 hammer2_lwinprog_ref(hammer2_pfsmount_t *pmp)
2802 {
2803         atomic_add_int(&pmp->count_lwinprog, 1);
2804 }
2805
2806 void
2807 hammer2_lwinprog_drop(hammer2_pfsmount_t *pmp)
2808 {
2809         int lwinprog;
2810
2811         lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1);
2812         if ((lwinprog & HAMMER2_LWINPROG_WAITING) &&
2813             (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) {
2814                 atomic_clear_int(&pmp->count_lwinprog,
2815                                  HAMMER2_LWINPROG_WAITING);
2816                 wakeup(&pmp->count_lwinprog);
2817         }
2818 }
2819
2820 void
2821 hammer2_lwinprog_wait(hammer2_pfsmount_t *pmp)
2822 {
2823         int lwinprog;
2824
2825         for (;;) {
2826                 lwinprog = pmp->count_lwinprog;
2827                 cpu_ccfence();
2828                 if ((lwinprog & HAMMER2_LWINPROG_MASK) < hammer2_flush_pipe)
2829                         break;
2830                 tsleep_interlock(&pmp->count_lwinprog, 0);
2831                 atomic_set_int(&pmp->count_lwinprog, HAMMER2_LWINPROG_WAITING);
2832                 lwinprog = pmp->count_lwinprog;
2833                 if ((lwinprog & HAMMER2_LWINPROG_MASK) < hammer2_flush_pipe)
2834                         break;
2835                 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz);
2836         }
2837 }
2838
2839 /*
2840  * Manage excessive memory resource use for chain and related
2841  * structures.
2842  */
2843 void
2844 hammer2_pfs_memory_wait(hammer2_pfsmount_t *pmp)
2845 {
2846         long waiting;
2847         long count;
2848         long limit;
2849 #if 0
2850         static int zzticks;
2851 #endif
2852
2853         /*
2854          * Atomic check condition and wait.  Also do an early speedup of
2855          * the syncer to try to avoid hitting the wait.
2856          */
2857         for (;;) {
2858                 waiting = pmp->inmem_dirty_chains;
2859                 cpu_ccfence();
2860                 count = waiting & HAMMER2_DIRTYCHAIN_MASK;
2861
2862                 limit = pmp->mp->mnt_nvnodelistsize / 10;
2863                 if (limit < hammer2_limit_dirty_chains)
2864                         limit = hammer2_limit_dirty_chains;
2865                 if (limit < 1000)
2866                         limit = 1000;
2867
2868 #if 0
2869                 if ((int)(ticks - zzticks) > hz) {
2870                         zzticks = ticks;
2871                         kprintf("count %ld %ld\n", count, limit);
2872                 }
2873 #endif
2874
2875                 /*
2876                  * Block if there are too many dirty chains present, wait
2877                  * for the flush to clean some out.
2878                  */
2879                 if (count > limit) {
2880                         tsleep_interlock(&pmp->inmem_dirty_chains, 0);
2881                         if (atomic_cmpset_long(&pmp->inmem_dirty_chains,
2882                                                waiting,
2883                                        waiting | HAMMER2_DIRTYCHAIN_WAITING)) {
2884                                 speedup_syncer(pmp->mp);
2885                                 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED,
2886                                        "chnmem", hz);
2887                         }
2888                         continue;       /* loop on success or fail */
2889                 }
2890
2891                 /*
2892                  * Try to start an early flush before we are forced to block.
2893                  */
2894                 if (count > limit * 7 / 10)
2895                         speedup_syncer(pmp->mp);
2896                 break;
2897         }
2898 }
2899
2900 void
2901 hammer2_pfs_memory_inc(hammer2_pfsmount_t *pmp)
2902 {
2903         if (pmp)
2904                 atomic_add_long(&pmp->inmem_dirty_chains, 1);
2905 }
2906
2907 void
2908 hammer2_pfs_memory_wakeup(hammer2_pfsmount_t *pmp)
2909 {
2910         long waiting;
2911
2912         if (pmp == NULL)
2913                 return;
2914
2915         for (;;) {
2916                 waiting = pmp->inmem_dirty_chains;
2917                 cpu_ccfence();
2918                 if (atomic_cmpset_long(&pmp->inmem_dirty_chains,
2919                                        waiting,
2920                                        (waiting - 1) &
2921                                         ~HAMMER2_DIRTYCHAIN_WAITING)) {
2922                         break;
2923                 }
2924         }
2925
2926         if (waiting & HAMMER2_DIRTYCHAIN_WAITING)
2927                 wakeup(&pmp->inmem_dirty_chains);
2928 }
2929
2930 /*
2931  * Debugging
2932  */
2933 void
2934 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx)
2935 {
2936         hammer2_chain_t *scan;
2937         hammer2_chain_t *first_parent;
2938
2939         --*countp;
2940         if (*countp == 0) {
2941                 kprintf("%*.*s...\n", tab, tab, "");
2942                 return;
2943         }
2944         if (*countp < 0)
2945                 return;
2946         first_parent = chain->core ? TAILQ_FIRST(&chain->core->ownerq) : NULL;
2947         kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n",
2948                 tab, tab, "", pfx,
2949                 chain, chain->bref.type,
2950                 chain->bref.key, chain->bref.keybits,
2951                 chain->bref.mirror_tid);
2952
2953         kprintf("%*.*s      [%08x] (%s) mod=%08x del=%08x "
2954                 "lo=%08x hi=%08x refs=%d\n",
2955                 tab, tab, "",
2956                 chain->flags,
2957                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
2958                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
2959                 chain->modify_xid,
2960                 chain->delete_xid,
2961                 chain->update_xlo,
2962                 chain->update_xhi,
2963                 chain->refs);
2964
2965         kprintf("%*.*s      core %p [%08x]",
2966                 tab, tab, "",
2967                 chain->core, (chain->core ? chain->core->flags : 0));
2968
2969         if (first_parent)
2970                 kprintf("\n%*.*s      fp=%p np=%p [fpflags %08x fprefs %d",
2971                         tab, tab, "",
2972                         first_parent,
2973                         (first_parent ? TAILQ_NEXT(first_parent, core_entry) :
2974                                         NULL),
2975                         first_parent->flags,
2976                         first_parent->refs);
2977         if (chain->core == NULL || RB_EMPTY(&chain->core->rbtree))
2978                 kprintf("\n");
2979         else
2980                 kprintf(" {\n");
2981         if (chain->core) {
2982                 RB_FOREACH(scan, hammer2_chain_tree, &chain->core->rbtree)
2983                         hammer2_dump_chain(scan, tab + 4, countp, 'a');
2984                 RB_FOREACH(scan, hammer2_chain_tree, &chain->core->dbtree)
2985                         hammer2_dump_chain(scan, tab + 4, countp, 'r');
2986                 TAILQ_FOREACH(scan, &chain->core->dbq, db_entry)
2987                         hammer2_dump_chain(scan, tab + 4, countp, 'd');
2988         }
2989         if (chain->core && !RB_EMPTY(&chain->core->rbtree)) {
2990                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
2991                         kprintf("%*.*s}(%s)\n", tab, tab, "",
2992                                 chain->data->ipdata.filename);
2993                 else
2994                         kprintf("%*.*s}\n", tab, tab, "");
2995         }
2996 }