sys/vfs/hammer2/hammer2_vfsops.c

   1 /*
   2  * Copyright (c) 2011-2015 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 #include "hammer2_lz4.h"
  62
  63 #include "zlib/hammer2_zlib.h"
  64
  65 #define REPORT_REFS_ERRORS 1    /* XXX remove me */
  66
  67 MALLOC_DEFINE(M_OBJCACHE, "objcache", "Object Cache");
  68
  69 struct hammer2_sync_info {
  70         hammer2_trans_t trans;
  71         int error;
  72         int waitfor;
  73 };
  74
  75 TAILQ_HEAD(hammer2_mntlist, hammer2_mount);
  76 TAILQ_HEAD(hammer2_pfslist, hammer2_pfsmount);
  77 static struct hammer2_mntlist hammer2_mntlist;
  78 static struct hammer2_pfslist hammer2_pfslist;
  79 static struct lock hammer2_mntlk;
  80
  81 int hammer2_debug;
  82 int hammer2_cluster_enable = 1;
  83 int hammer2_hardlink_enable = 1;
  84 int hammer2_flush_pipe = 100;
  85 int hammer2_synchronous_flush = 1;
  86 int hammer2_dio_count;
  87 long hammer2_limit_dirty_chains;
  88 long hammer2_iod_file_read;
  89 long hammer2_iod_meta_read;
  90 long hammer2_iod_indr_read;
  91 long hammer2_iod_fmap_read;
  92 long hammer2_iod_volu_read;
  93 long hammer2_iod_file_write;
  94 long hammer2_iod_meta_write;
  95 long hammer2_iod_indr_write;
  96 long hammer2_iod_fmap_write;
  97 long hammer2_iod_volu_write;
  98 long hammer2_ioa_file_read;
  99 long hammer2_ioa_meta_read;
 100 long hammer2_ioa_indr_read;
 101 long hammer2_ioa_fmap_read;
 102 long hammer2_ioa_volu_read;
 103 long hammer2_ioa_fmap_write;
 104 long hammer2_ioa_file_write;
 105 long hammer2_ioa_meta_write;
 106 long hammer2_ioa_indr_write;
 107 long hammer2_ioa_volu_write;
 108
 109 MALLOC_DECLARE(C_BUFFER);
 110 MALLOC_DEFINE(C_BUFFER, "compbuffer", "Buffer used for compression.");
 111
 112 MALLOC_DECLARE(D_BUFFER);
 113 MALLOC_DEFINE(D_BUFFER, "decompbuffer", "Buffer used for decompression.");
 114
 115 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
 116
 117 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
 118            &hammer2_debug, 0, "");
 119 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_enable, CTLFLAG_RW,
 120            &hammer2_cluster_enable, 0, "");
 121 SYSCTL_INT(_vfs_hammer2, OID_AUTO, hardlink_enable, CTLFLAG_RW,
 122            &hammer2_hardlink_enable, 0, "");
 123 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW,
 124            &hammer2_flush_pipe, 0, "");
 125 SYSCTL_INT(_vfs_hammer2, OID_AUTO, synchronous_flush, CTLFLAG_RW,
 126            &hammer2_synchronous_flush, 0, "");
 127 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW,
 128            &hammer2_limit_dirty_chains, 0, "");
 129 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD,
 130            &hammer2_dio_count, 0, "");
 131
 132 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
 133            &hammer2_iod_file_read, 0, "");
 134 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
 135            &hammer2_iod_meta_read, 0, "");
 136 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
 137            &hammer2_iod_indr_read, 0, "");
 138 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW,
 139            &hammer2_iod_fmap_read, 0, "");
 140 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW,
 141            &hammer2_iod_volu_read, 0, "");
 142
 143 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
 144            &hammer2_iod_file_write, 0, "");
 145 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
 146            &hammer2_iod_meta_write, 0, "");
 147 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
 148            &hammer2_iod_indr_write, 0, "");
 149 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW,
 150            &hammer2_iod_fmap_write, 0, "");
 151 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
 152            &hammer2_iod_volu_write, 0, "");
 153
 154 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_read, CTLFLAG_RW,
 155            &hammer2_ioa_file_read, 0, "");
 156 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_read, CTLFLAG_RW,
 157            &hammer2_ioa_meta_read, 0, "");
 158 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_read, CTLFLAG_RW,
 159            &hammer2_ioa_indr_read, 0, "");
 160 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_fmap_read, CTLFLAG_RW,
 161            &hammer2_ioa_fmap_read, 0, "");
 162 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_read, CTLFLAG_RW,
 163            &hammer2_ioa_volu_read, 0, "");
 164
 165 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_write, CTLFLAG_RW,
 166            &hammer2_ioa_file_write, 0, "");
 167 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_write, CTLFLAG_RW,
 168            &hammer2_ioa_meta_write, 0, "");
 169 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_write, CTLFLAG_RW,
 170            &hammer2_ioa_indr_write, 0, "");
 171 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_fmap_write, CTLFLAG_RW,
 172            &hammer2_ioa_fmap_write, 0, "");
 173 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_write, CTLFLAG_RW,
 174            &hammer2_ioa_volu_write, 0, "");
 175
 176 static int hammer2_vfs_init(struct vfsconf *conf);
 177 static int hammer2_vfs_uninit(struct vfsconf *vfsp);
 178 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 179                                 struct ucred *cred);
 180 static int hammer2_remount(hammer2_mount_t *, struct mount *, char *,
 181                                 struct vnode *, struct ucred *);
 182 static int hammer2_recovery(hammer2_mount_t *hmp);
 183 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
 184 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
 185 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
 186                                 struct ucred *cred);
 187 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 188                                 struct ucred *cred);
 189 static int hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 190                                 ino_t ino, struct vnode **vpp);
 191 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 192                                 struct fid *fhp, struct vnode **vpp);
 193 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 194 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 195                                 int *exflagsp, struct ucred **credanonp);
 196
 197 static int hammer2_install_volume_header(hammer2_mount_t *hmp);
 198 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
 199
 200 static void hammer2_write_thread(void *arg);
 201
 202 static void hammer2_vfs_unmount_hmp1(struct mount *mp, hammer2_mount_t *hmp);
 203 static void hammer2_vfs_unmount_hmp2(struct mount *mp, hammer2_mount_t *hmp);
 204
 205 /*
 206  * Functions for compression in threads,
 207  * from hammer2_vnops.c
 208  */
 209 static void hammer2_write_file_core(struct buf *bp, hammer2_trans_t *trans,
 210                                 hammer2_inode_t *ip,
 211                                 const hammer2_inode_data_t *ripdata,
 212                                 hammer2_cluster_t *cparent,
 213                                 hammer2_key_t lbase, int ioflag, int pblksize,
 214                                 int *errorp);
 215 static void hammer2_compress_and_write(struct buf *bp, hammer2_trans_t *trans,
 216                                 hammer2_inode_t *ip,
 217                                 const hammer2_inode_data_t *ripdata,
 218                                 hammer2_cluster_t *cparent,
 219                                 hammer2_key_t lbase, int ioflag,
 220                                 int pblksize, int *errorp,
 221                                 int comp_algo, int check_algo);
 222 static void hammer2_zero_check_and_write(struct buf *bp,
 223                                 hammer2_trans_t *trans, hammer2_inode_t *ip,
 224                                 const hammer2_inode_data_t *ripdata,
 225                                 hammer2_cluster_t *cparent,
 226                                 hammer2_key_t lbase,
 227                                 int ioflag, int pblksize, int *errorp,
 228                                 int check_algo);
 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 *ripdata,
 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                                 int check_algo);
 239
 240 /*
 241  * HAMMER2 vfs operations.
 242  */
 243 static struct vfsops hammer2_vfsops = {
 244         .vfs_init       = hammer2_vfs_init,
 245         .vfs_uninit     = hammer2_vfs_uninit,
 246         .vfs_sync       = hammer2_vfs_sync,
 247         .vfs_mount      = hammer2_vfs_mount,
 248         .vfs_unmount    = hammer2_vfs_unmount,
 249         .vfs_root       = hammer2_vfs_root,
 250         .vfs_statfs     = hammer2_vfs_statfs,
 251         .vfs_statvfs    = hammer2_vfs_statvfs,
 252         .vfs_vget       = hammer2_vfs_vget,
 253         .vfs_vptofh     = hammer2_vfs_vptofh,
 254         .vfs_fhtovp     = hammer2_vfs_fhtovp,
 255         .vfs_checkexp   = hammer2_vfs_checkexp
 256 };
 257
 258 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
 259
 260 VFS_SET(hammer2_vfsops, hammer2, 0);
 261 MODULE_VERSION(hammer2, 1);
 262
 263 static
 264 int
 265 hammer2_vfs_init(struct vfsconf *conf)
 266 {
 267         static struct objcache_malloc_args margs_read;
 268         static struct objcache_malloc_args margs_write;
 269
 270         int error;
 271
 272         error = 0;
 273
 274         if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
 275                 error = EINVAL;
 276         if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
 277                 error = EINVAL;
 278         if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
 279                 error = EINVAL;
 280
 281         if (error)
 282                 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
 283
 284         margs_read.objsize = 65536;
 285         margs_read.mtype = D_BUFFER;
 286
 287         margs_write.objsize = 32768;
 288         margs_write.mtype = C_BUFFER;
 289
 290         cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc,
 291                                 0, 1, NULL, NULL, NULL, objcache_malloc_alloc,
 292                                 objcache_malloc_free, &margs_read);
 293         cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc,
 294                                 0, 1, NULL, NULL, NULL, objcache_malloc_alloc,
 295                                 objcache_malloc_free, &margs_write);
 296
 297         lockinit(&hammer2_mntlk, "mntlk", 0, 0);
 298         TAILQ_INIT(&hammer2_mntlist);
 299         TAILQ_INIT(&hammer2_pfslist);
 300
 301         hammer2_limit_dirty_chains = desiredvnodes / 10;
 302
 303         hammer2_trans_manage_init();
 304
 305         return (error);
 306 }
 307
 308 static
 309 int
 310 hammer2_vfs_uninit(struct vfsconf *vfsp __unused)
 311 {
 312         objcache_destroy(cache_buffer_read);
 313         objcache_destroy(cache_buffer_write);
 314         return 0;
 315 }
 316
 317 /*
 318  * Core PFS allocator.  Used to allocate the pmp structure for PFS cluster
 319  * mounts and the spmp structure for media (hmp) structures.
 320  */
 321 static hammer2_pfsmount_t *
 322 hammer2_pfsalloc(const hammer2_inode_data_t *ripdata, hammer2_tid_t alloc_tid)
 323 {
 324         hammer2_pfsmount_t *pmp;
 325
 326         pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
 327         kmalloc_create(&pmp->minode, "HAMMER2-inodes");
 328         kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
 329         lockinit(&pmp->lock, "pfslk", 0, 0);
 330         spin_init(&pmp->inum_spin, "hm2pfsalloc_inum");
 331         RB_INIT(&pmp->inum_tree);
 332         TAILQ_INIT(&pmp->unlinkq);
 333         spin_init(&pmp->list_spin, "hm2pfsalloc_list");
 334
 335         pmp->alloc_tid = alloc_tid + 1;   /* our first media transaction id */
 336         pmp->flush_tid = pmp->alloc_tid;
 337         if (ripdata) {
 338                 pmp->inode_tid = ripdata->pfs_inum + 1;
 339                 pmp->pfs_clid = ripdata->pfs_clid;
 340         }
 341         hammer2_mtx_init(&pmp->wthread_mtx, "h2wthr");
 342         bioq_init(&pmp->wthread_bioq);
 343
 344         return pmp;
 345 }
 346
 347 /*
 348  * Mount or remount HAMMER2 fileystem from physical media
 349  *
 350  *      mountroot
 351  *              mp              mount point structure
 352  *              path            NULL
 353  *              data            <unused>
 354  *              cred            <unused>
 355  *
 356  *      mount
 357  *              mp              mount point structure
 358  *              path            path to mount point
 359  *              data            pointer to argument structure in user space
 360  *                      volume  volume path (device@LABEL form)
 361  *                      hflags  user mount flags
 362  *              cred            user credentials
 363  *
 364  * RETURNS:     0       Success
 365  *              !0      error number
 366  */
 367 static
 368 int
 369 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 370                   struct ucred *cred)
 371 {
 372         struct hammer2_mount_info info;
 373         hammer2_pfsmount_t *pmp;
 374         hammer2_pfsmount_t *spmp;
 375         hammer2_mount_t *hmp;
 376         hammer2_key_t key_next;
 377         hammer2_key_t key_dummy;
 378         hammer2_key_t lhc;
 379         struct vnode *devvp;
 380         struct nlookupdata nd;
 381         hammer2_chain_t *parent;
 382         hammer2_chain_t *rchain;
 383         hammer2_cluster_t *cluster;
 384         hammer2_cluster_t *cparent;
 385         const hammer2_inode_data_t *ripdata;
 386         hammer2_blockref_t bref;
 387         struct file *fp;
 388         char devstr[MNAMELEN];
 389         size_t size;
 390         size_t done;
 391         char *dev;
 392         char *label;
 393         int ronly = 1;
 394         int error;
 395         int cache_index;
 396         int ddflag;
 397         int i;
 398
 399         hmp = NULL;
 400         pmp = NULL;
 401         dev = NULL;
 402         label = NULL;
 403         devvp = NULL;
 404         cache_index = -1;
 405
 406         kprintf("hammer2_mount\n");
 407
 408         if (path == NULL) {
 409                 /*
 410                  * Root mount
 411                  */
 412                 bzero(&info, sizeof(info));
 413                 info.cluster_fd = -1;
 414                 return (EOPNOTSUPP);
 415         } else {
 416                 /*
 417                  * Non-root mount or updating a mount
 418                  */
 419                 error = copyin(data, &info, sizeof(info));
 420                 if (error)
 421                         return (error);
 422
 423                 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
 424                 if (error)
 425                         return (error);
 426
 427                 /* Extract device and label */
 428                 dev = devstr;
 429                 label = strchr(devstr, '@');
 430                 if (label == NULL ||
 431                     ((label + 1) - dev) > done) {
 432                         return (EINVAL);
 433                 }
 434                 *label = '\0';
 435                 label++;
 436                 if (*label == '\0')
 437                         return (EINVAL);
 438
 439                 if (mp->mnt_flag & MNT_UPDATE) {
 440                         /*
 441                          * Update mount.  Note that pmp->iroot->cluster is
 442                          * an inode-embedded cluster and thus cannot be
 443                          * directly locked.
 444                          *
 445                          * XXX HAMMER2 needs to implement NFS export via
 446                          *     mountctl.
 447                          */
 448                         pmp = MPTOPMP(mp);
 449                         cluster = &pmp->iroot->cluster;
 450                         for (i = 0; i < cluster->nchains; ++i) {
 451                                 hmp = cluster->array[i].chain->hmp;
 452                                 devvp = hmp->devvp;
 453                                 error = hammer2_remount(hmp, mp, path,
 454                                                         devvp, cred);
 455                                 if (error)
 456                                         break;
 457                         }
 458                         /*hammer2_inode_install_hidden(pmp);*/
 459
 460                         return error;
 461                 }
 462         }
 463
 464         /*
 465          * HMP device mount
 466          *
 467          * Lookup name and verify it refers to a block device.
 468          */
 469         error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
 470         if (error == 0)
 471                 error = nlookup(&nd);
 472         if (error == 0)
 473                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 474         nlookup_done(&nd);
 475
 476         if (error == 0) {
 477                 if (vn_isdisk(devvp, &error))
 478                         error = vfs_mountedon(devvp);
 479         }
 480
 481         /*
 482          * Determine if the device has already been mounted.  After this
 483          * check hmp will be non-NULL if we are doing the second or more
 484          * hammer2 mounts from the same device.
 485          */
 486         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 487         TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
 488                 if (hmp->devvp == devvp)
 489                         break;
 490         }
 491
 492         /*
 493          * Open the device if this isn't a secondary mount and construct
 494          * the H2 device mount (hmp).
 495          */
 496         if (hmp == NULL) {
 497                 hammer2_chain_t *schain;
 498                 hammer2_xid_t xid;
 499
 500                 if (error == 0 && vcount(devvp) > 0)
 501                         error = EBUSY;
 502
 503                 /*
 504                  * Now open the device
 505                  */
 506                 if (error == 0) {
 507                         ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 508                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 509                         error = vinvalbuf(devvp, V_SAVE, 0, 0);
 510                         if (error == 0) {
 511                                 error = VOP_OPEN(devvp,
 512                                                  ronly ? FREAD : FREAD | FWRITE,
 513                                                  FSCRED, NULL);
 514                         }
 515                         vn_unlock(devvp);
 516                 }
 517                 if (error && devvp) {
 518                         vrele(devvp);
 519                         devvp = NULL;
 520                 }
 521                 if (error) {
 522                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 523                         return error;
 524                 }
 525                 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
 526                 hmp->ronly = ronly;
 527                 hmp->devvp = devvp;
 528                 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
 529                 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
 530                 RB_INIT(&hmp->iotree);
 531                 spin_init(&hmp->io_spin, "hm2mount_io");
 532                 spin_init(&hmp->list_spin, "hm2mount_list");
 533                 TAILQ_INIT(&hmp->flushq);
 534
 535                 lockinit(&hmp->vollk, "h2vol", 0, 0);
 536
 537                 /*
 538                  * vchain setup. vchain.data is embedded.
 539                  * vchain.refs is initialized and will never drop to 0.
 540                  *
 541                  * NOTE! voldata is not yet loaded.
 542                  */
 543                 hmp->vchain.hmp = hmp;
 544                 hmp->vchain.refs = 1;
 545                 hmp->vchain.data = (void *)&hmp->voldata;
 546                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
 547                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 548                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
 549
 550                 hammer2_chain_core_alloc(NULL, &hmp->vchain);
 551                 /* hmp->vchain.u.xxx is left NULL */
 552
 553                 /*
 554                  * fchain setup.  fchain.data is embedded.
 555                  * fchain.refs is initialized and will never drop to 0.
 556                  *
 557                  * The data is not used but needs to be initialized to
 558                  * pass assertion muster.  We use this chain primarily
 559                  * as a placeholder for the freemap's top-level RBTREE
 560                  * so it does not interfere with the volume's topology
 561                  * RBTREE.
 562                  */
 563                 hmp->fchain.hmp = hmp;
 564                 hmp->fchain.refs = 1;
 565                 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
 566                 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
 567                 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 568                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
 569                 hmp->fchain.bref.methods =
 570                         HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
 571                         HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
 572
 573                 hammer2_chain_core_alloc(NULL, &hmp->fchain);
 574                 /* hmp->fchain.u.xxx is left NULL */
 575
 576                 /*
 577                  * Install the volume header and initialize fields from
 578                  * voldata.
 579                  */
 580                 error = hammer2_install_volume_header(hmp);
 581                 if (error) {
 582                         ++hmp->pmp_count;
 583                         hammer2_vfs_unmount_hmp1(mp, hmp);
 584                         hammer2_vfs_unmount_hmp2(mp, hmp);
 585                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 586                         hammer2_vfs_unmount(mp, MNT_FORCE);
 587                         return error;
 588                 }
 589
 590                 /*
 591                  * Really important to get these right or flush will get
 592                  * confused.
 593                  */
 594                 hmp->spmp = hammer2_pfsalloc(NULL, hmp->voldata.mirror_tid);
 595                 kprintf("alloc spmp %p tid %016jx\n",
 596                         hmp->spmp, hmp->voldata.mirror_tid);
 597                 spmp = hmp->spmp;
 598                 spmp->inode_tid = 1;
 599
 600                 xid = 0;
 601                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
 602                 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid;
 603                 hmp->vchain.pmp = spmp;
 604                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
 605                 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid;
 606                 hmp->fchain.pmp = spmp;
 607
 608                 /*
 609                  * First locate the super-root inode, which is key 0
 610                  * relative to the volume header's blockset.
 611                  *
 612                  * Then locate the root inode by scanning the directory keyspace
 613                  * represented by the label.
 614                  */
 615                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
 616                 schain = hammer2_chain_lookup(&parent, &key_dummy,
 617                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
 618                                       &cache_index, 0, &ddflag);
 619                 hammer2_chain_lookup_done(parent);
 620                 if (schain == NULL) {
 621                         kprintf("hammer2_mount: invalid super-root\n");
 622                         ++hmp->pmp_count;
 623                         hammer2_vfs_unmount_hmp1(mp, hmp);
 624                         hammer2_vfs_unmount_hmp2(mp, hmp);
 625                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 626                         hammer2_vfs_unmount(mp, MNT_FORCE);
 627                         return EINVAL;
 628                 }
 629
 630                 /*
 631                  * Sanity-check schain's pmp, finish initializing spmp.
 632                  */
 633                 ripdata = &hammer2_chain_rdata(schain)->ipdata;
 634                 KKASSERT(schain->pmp == spmp);
 635                 spmp->pfs_clid = ripdata->pfs_clid;
 636
 637                 /*
 638                  * NOTE: inode_get sucks up schain's lock.
 639                  */
 640                 cluster = hammer2_cluster_from_chain(schain);
 641                 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster);
 642                 spmp->spmp_hmp = hmp;
 643                 hammer2_inode_ref(spmp->iroot);
 644                 hammer2_inode_unlock_ex(spmp->iroot, cluster);
 645                 schain = NULL;
 646                 /* leave spmp->iroot with one ref */
 647
 648                 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
 649                         error = hammer2_recovery(hmp);
 650                         /* XXX do something with error */
 651                 }
 652                 ++hmp->pmp_count;
 653
 654                 hammer2_iocom_init(hmp);
 655
 656                 /*
 657                  * Ref the cluster management messaging descriptor.  The mount
 658                  * program deals with the other end of the communications pipe.
 659                  */
 660                 fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
 661                 if (fp) {
 662                         hammer2_cluster_reconnect(hmp, fp);
 663                 } else {
 664                         kprintf("hammer2_mount: bad cluster_fd!\n");
 665                 }
 666         } else {
 667                 spmp = hmp->spmp;
 668                 ++hmp->pmp_count;
 669         }
 670
 671         /*
 672          * Lookup mount point under the media-localized super-root.
 673          *
 674          * cluster->pmp will incorrectly point to spmp and must be fixed
 675          * up later on.
 676          */
 677         cparent = hammer2_inode_lock_ex(spmp->iroot);
 678         lhc = hammer2_dirhash(label, strlen(label));
 679         cluster = hammer2_cluster_lookup(cparent, &key_next,
 680                                       lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 681                                       0, &ddflag);
 682         while (cluster) {
 683                 if (hammer2_cluster_type(cluster) == HAMMER2_BREF_TYPE_INODE &&
 684                     strcmp(label,
 685                        hammer2_cluster_rdata(cluster)->ipdata.filename) == 0) {
 686                         break;
 687                 }
 688                 cluster = hammer2_cluster_next(cparent, cluster, &key_next,
 689                                             key_next,
 690                                             lhc + HAMMER2_DIRHASH_LOMASK, 0);
 691         }
 692         hammer2_inode_unlock_ex(spmp->iroot, cparent);
 693
 694         if (cluster == NULL) {
 695                 kprintf("hammer2_mount: PFS label not found\n");
 696                 hammer2_vfs_unmount_hmp1(mp, hmp);
 697                 hammer2_vfs_unmount_hmp2(mp, hmp);
 698                 lockmgr(&hammer2_mntlk, LK_RELEASE);
 699                 hammer2_vfs_unmount(mp, MNT_FORCE);
 700                 return EINVAL;
 701         }
 702
 703         for (i = 0; i < cluster->nchains; ++i) {
 704                 rchain = cluster->array[i].chain;
 705                 if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
 706                         kprintf("hammer2_mount: PFS label already mounted!\n");
 707                         hammer2_cluster_unlock(cluster);
 708                         hammer2_vfs_unmount_hmp1(mp, hmp);
 709                         hammer2_vfs_unmount_hmp2(mp, hmp);
 710                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 711                         hammer2_vfs_unmount(mp, MNT_FORCE);
 712                         return EBUSY;
 713                 }
 714                 KKASSERT(rchain->pmp == NULL);
 715 #if 0
 716                 if (rchain->flags & HAMMER2_CHAIN_RECYCLE) {
 717                         kprintf("hammer2_mount: PFS label is recycling\n");
 718                         hammer2_cluster_unlock(cluster);
 719                         hammer2_vfs_unmount_hmp1(mp, hmp);
 720                         hammer2_vfs_unmount_hmp2(mp, hmp);
 721                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 722                         hammer2_vfs_unmount(mp, MNT_FORCE);
 723                         return EBUSY;
 724                 }
 725 #endif
 726         }
 727
 728         /*
 729          * Check to see if the cluster id is already mounted at the mount
 730          * point.  If it is, add us to the cluster.
 731          */
 732         ripdata = &hammer2_cluster_rdata(cluster)->ipdata;
 733         hammer2_cluster_bref(cluster, &bref);
 734         TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
 735                 if (pmp->spmp_hmp == NULL &&
 736                     bcmp(&pmp->pfs_clid, &ripdata->pfs_clid,
 737                          sizeof(pmp->pfs_clid)) == 0) {
 738                         break;
 739                 }
 740         }
 741
 742         if (pmp) {
 743                 int i;
 744                 int j;
 745
 746                 /*
 747                  * Directly lock the inode->lock, do not run through
 748                  * hammer2_inode_lock*().
 749                  */
 750                 hammer2_inode_ref(pmp->iroot);
 751                 hammer2_mtx_ex(&pmp->iroot->lock);
 752
 753                 if (pmp->iroot->cluster.nchains + cluster->nchains >
 754                     HAMMER2_MAXCLUSTER) {
 755                         kprintf("hammer2_mount: cluster full!\n");
 756
 757                         hammer2_mtx_unlock(&pmp->iroot->lock);
 758                         hammer2_inode_drop(pmp->iroot);
 759
 760                         hammer2_cluster_unlock(cluster);
 761                         hammer2_vfs_unmount_hmp1(mp, hmp);
 762                         hammer2_vfs_unmount_hmp2(mp, hmp);
 763                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 764                         hammer2_vfs_unmount(mp, MNT_FORCE);
 765                         return EBUSY;
 766                 }
 767                 kprintf("hammer2_vfs_mount: Adding pfs to existing cluster\n");
 768                 j = pmp->iroot->cluster.nchains;
 769                 for (i = 0; i < cluster->nchains; ++i) {
 770                         rchain = cluster->array[i].chain;
 771                         KKASSERT(rchain->pmp == NULL);
 772                         rchain->pmp = pmp;
 773                         hammer2_chain_ref(rchain);
 774                         pmp->iroot->cluster.array[j].chain = rchain;
 775                         ++j;
 776                 }
 777                 pmp->iroot->cluster.nchains = j;
 778                 hammer2_mtx_unlock(&pmp->iroot->lock);
 779                 hammer2_inode_drop(pmp->iroot);
 780                 hammer2_cluster_unlock(cluster);
 781                 lockmgr(&hammer2_mntlk, LK_RELEASE);
 782
 783                 kprintf("ok\n");
 784                 hammer2_inode_install_hidden(pmp);
 785
 786                 return ERANGE;
 787         }
 788
 789         /*
 790          * Block device opened successfully, finish initializing the
 791          * mount structure.
 792          *
 793          * From this point on we have to call hammer2_unmount() on failure.
 794          */
 795         pmp = hammer2_pfsalloc(ripdata, bref.mirror_tid);
 796         kprintf("PMP mirror_tid is %016jx\n", bref.mirror_tid);
 797         for (i = 0; i < cluster->nchains; ++i) {
 798                 rchain = cluster->array[i].chain;
 799                 KKASSERT(rchain->pmp == NULL);
 800                 rchain->pmp = pmp;
 801                 atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
 802         }
 803         cluster->pmp = pmp;
 804
 805         TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry);
 806         lockmgr(&hammer2_mntlk, LK_RELEASE);
 807
 808         kprintf("hammer2_mount hmp=%p pmp=%p pmpcnt=%d\n",
 809                 hmp, pmp, hmp->pmp_count);
 810
 811         mp->mnt_flag = MNT_LOCAL;
 812         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
 813         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
 814
 815         /*
 816          * required mount structure initializations
 817          */
 818         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
 819         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
 820
 821         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
 822         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 823
 824         /*
 825          * Optional fields
 826          */
 827         mp->mnt_iosize_max = MAXPHYS;
 828         mp->mnt_data = (qaddr_t)pmp;
 829         pmp->mp = mp;
 830
 831         /*
 832          * After this point hammer2_vfs_unmount() has visibility on hmp
 833          * and manual hmp1/hmp2 calls are not needed on fatal errors.
 834          */
 835         pmp->iroot = hammer2_inode_get(pmp, NULL, cluster);
 836         hammer2_inode_ref(pmp->iroot);          /* ref for pmp->iroot */
 837         hammer2_inode_unlock_ex(pmp->iroot, cluster);
 838
 839         /*
 840          * The logical file buffer bio write thread handles things
 841          * like physical block assignment and compression.
 842          *
 843          * (only applicable to pfs mounts, not applicable to spmp)
 844          */
 845         pmp->wthread_destroy = 0;
 846         lwkt_create(hammer2_write_thread, pmp,
 847                     &pmp->wthread_td, NULL, 0, -1, "hwrite-%s", label);
 848
 849         /*
 850          * With the cluster operational install ihidden.
 851          * (only applicable to pfs mounts, not applicable to spmp)
 852          */
 853         hammer2_inode_install_hidden(pmp);
 854
 855         /*
 856          * Finish setup
 857          */
 858         vfs_getnewfsid(mp);
 859         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
 860         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
 861         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
 862
 863         copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 864         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 865         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
 866         copyinstr(path, mp->mnt_stat.f_mntonname,
 867                   sizeof(mp->mnt_stat.f_mntonname) - 1,
 868                   &size);
 869
 870         /*
 871          * Initial statfs to prime mnt_stat.
 872          */
 873         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
 874
 875         return 0;
 876 }
 877
 878 /*
 879  * Handle bioq for strategy write
 880  */
 881 static
 882 void
 883 hammer2_write_thread(void *arg)
 884 {
 885         hammer2_pfsmount_t *pmp;
 886         struct bio *bio;
 887         struct buf *bp;
 888         hammer2_trans_t trans;
 889         struct vnode *vp;
 890         hammer2_inode_t *ip;
 891         hammer2_cluster_t *cparent;
 892         hammer2_inode_data_t *wipdata;
 893         hammer2_key_t lbase;
 894         int lblksize;
 895         int pblksize;
 896         int error;
 897
 898         pmp = arg;
 899
 900         hammer2_mtx_ex(&pmp->wthread_mtx);
 901         while (pmp->wthread_destroy == 0) {
 902                 if (bioq_first(&pmp->wthread_bioq) == NULL) {
 903                         mtxsleep(&pmp->wthread_bioq, &pmp->wthread_mtx,
 904                                  0, "h2bioqw", 0);
 905                 }
 906                 cparent = NULL;
 907
 908                 hammer2_trans_init(&trans, pmp, HAMMER2_TRANS_BUFCACHE);
 909
 910                 while ((bio = bioq_takefirst(&pmp->wthread_bioq)) != NULL) {
 911                         /*
 912                          * dummy bio for synchronization.  The transaction
 913                          * must be reinitialized.
 914                          */
 915                         if (bio->bio_buf == NULL) {
 916                                 bio->bio_flags |= BIO_DONE;
 917                                 wakeup(bio);
 918                                 hammer2_trans_done(&trans);
 919                                 hammer2_trans_init(&trans, pmp,
 920                                                    HAMMER2_TRANS_BUFCACHE);
 921                                 continue;
 922                         }
 923
 924                         /*
 925                          * else normal bio processing
 926                          */
 927                         hammer2_mtx_unlock(&pmp->wthread_mtx);
 928
 929                         hammer2_lwinprog_drop(pmp);
 930
 931                         error = 0;
 932                         bp = bio->bio_buf;
 933                         vp = bp->b_vp;
 934                         ip = VTOI(vp);
 935
 936                         /*
 937                          * Inode is modified, flush size and mtime changes
 938                          * to ensure that the file size remains consistent
 939                          * with the buffers being flushed.
 940                          *
 941                          * NOTE: The inode_fsync() call only flushes the
 942                          *       inode's meta-data state, it doesn't try
 943                          *       to flush underlying buffers or chains.
 944                          */
 945                         cparent = hammer2_inode_lock_ex(ip);
 946                         if (ip->flags & (HAMMER2_INODE_RESIZED |
 947                                          HAMMER2_INODE_MTIME)) {
 948                                 hammer2_inode_fsync(&trans, ip, cparent);
 949                         }
 950                         wipdata = hammer2_cluster_modify_ip(&trans, ip,
 951                                                          cparent, 0);
 952                         lblksize = hammer2_calc_logical(ip, bio->bio_offset,
 953                                                         &lbase, NULL);
 954                         pblksize = hammer2_calc_physical(ip, wipdata, lbase);
 955                         hammer2_write_file_core(bp, &trans, ip, wipdata,
 956                                                 cparent,
 957                                                 lbase, IO_ASYNC,
 958                                                 pblksize, &error);
 959                         hammer2_cluster_modsync(cparent);
 960                         hammer2_inode_unlock_ex(ip, cparent);
 961                         if (error) {
 962                                 kprintf("hammer2: error in buffer write\n");
 963                                 bp->b_flags |= B_ERROR;
 964                                 bp->b_error = EIO;
 965                         }
 966                         biodone(bio);
 967                         hammer2_mtx_ex(&pmp->wthread_mtx);
 968                 }
 969                 hammer2_trans_done(&trans);
 970         }
 971         pmp->wthread_destroy = -1;
 972         wakeup(&pmp->wthread_destroy);
 973
 974         hammer2_mtx_unlock(&pmp->wthread_mtx);
 975 }
 976
 977 void
 978 hammer2_bioq_sync(hammer2_pfsmount_t *pmp)
 979 {
 980         struct bio sync_bio;
 981
 982         bzero(&sync_bio, sizeof(sync_bio));     /* dummy with no bio_buf */
 983         hammer2_mtx_ex(&pmp->wthread_mtx);
 984         if (pmp->wthread_destroy == 0 &&
 985             TAILQ_FIRST(&pmp->wthread_bioq.queue)) {
 986                 bioq_insert_tail(&pmp->wthread_bioq, &sync_bio);
 987                 while ((sync_bio.bio_flags & BIO_DONE) == 0)
 988                         mtxsleep(&sync_bio, &pmp->wthread_mtx, 0, "h2bioq", 0);
 989         }
 990         hammer2_mtx_unlock(&pmp->wthread_mtx);
 991 }
 992
 993 /*
 994  * Return a chain suitable for I/O, creating the chain if necessary
 995  * and assigning its physical block.
 996  */
 997 static
 998 hammer2_cluster_t *
 999 hammer2_assign_physical(hammer2_trans_t *trans,
1000                         hammer2_inode_t *ip, hammer2_cluster_t *cparent,
1001                         hammer2_key_t lbase, int pblksize, int *errorp)
1002 {
1003         hammer2_cluster_t *cluster;
1004         hammer2_cluster_t *dparent;
1005         hammer2_key_t key_dummy;
1006         int pradix = hammer2_getradix(pblksize);
1007         int ddflag;
1008
1009         /*
1010          * Locate the chain associated with lbase, return a locked chain.
1011          * However, do not instantiate any data reference (which utilizes a
1012          * device buffer) because we will be using direct IO via the
1013          * logical buffer cache buffer.
1014          */
1015         *errorp = 0;
1016         KKASSERT(pblksize >= HAMMER2_ALLOC_MIN);
1017 retry:
1018         dparent = hammer2_cluster_lookup_init(cparent, 0);
1019         cluster = hammer2_cluster_lookup(dparent, &key_dummy,
1020                                      lbase, lbase,
1021                                      HAMMER2_LOOKUP_NODATA, &ddflag);
1022
1023         if (cluster == NULL) {
1024                 /*
1025                  * We found a hole, create a new chain entry.
1026                  *
1027                  * NOTE: DATA chains are created without device backing
1028                  *       store (nor do we want any).
1029                  */
1030                 *errorp = hammer2_cluster_create(trans, dparent, &cluster,
1031                                                lbase, HAMMER2_PBUFRADIX,
1032                                                HAMMER2_BREF_TYPE_DATA,
1033                                                pblksize, 0);
1034                 if (cluster == NULL) {
1035                         hammer2_cluster_lookup_done(dparent);
1036                         panic("hammer2_cluster_create: par=%p error=%d\n",
1037                                 dparent->focus, *errorp);
1038                         goto retry;
1039                 }
1040                 /*ip->delta_dcount += pblksize;*/
1041         } else {
1042                 switch (hammer2_cluster_type(cluster)) {
1043                 case HAMMER2_BREF_TYPE_INODE:
1044                         /*
1045                          * The data is embedded in the inode.  The
1046                          * caller is responsible for marking the inode
1047                          * modified and copying the data to the embedded
1048                          * area.
1049                          */
1050                         break;
1051                 case HAMMER2_BREF_TYPE_DATA:
1052                         if (hammer2_cluster_need_resize(cluster, pblksize)) {
1053                                 hammer2_cluster_resize(trans, ip,
1054                                                      dparent, cluster,
1055                                                      pradix,
1056                                                      HAMMER2_MODIFY_OPTDATA);
1057                         }
1058
1059                         /*
1060                          * DATA buffers must be marked modified whether the
1061                          * data is in a logical buffer or not.  We also have
1062                          * to make this call to fixup the chain data pointers
1063                          * after resizing in case this is an encrypted or
1064                          * compressed buffer.
1065                          */
1066                         hammer2_cluster_modify(trans, cluster,
1067                                                HAMMER2_MODIFY_OPTDATA);
1068                         break;
1069                 default:
1070                         panic("hammer2_assign_physical: bad type");
1071                         /* NOT REACHED */
1072                         break;
1073                 }
1074         }
1075
1076         /*
1077          * Cleanup.  If cluster wound up being the inode itself, i.e.
1078          * the DIRECTDATA case for offset 0, then we need to update cparent.
1079          * The caller expects cparent to not become stale.
1080          */
1081         hammer2_cluster_lookup_done(dparent);
1082         /* dparent = NULL; safety */
1083         if (cluster && ddflag)
1084                 hammer2_cluster_replace_locked(cparent, cluster);
1085         return (cluster);
1086 }
1087
1088 /*
1089  * bio queued from hammer2_vnops.c.
1090  *
1091  * The core write function which determines which path to take
1092  * depending on compression settings.  We also have to locate the
1093  * related clusters so we can calculate and set the check data for
1094  * the blockref.
1095  */
1096 static
1097 void
1098 hammer2_write_file_core(struct buf *bp, hammer2_trans_t *trans,
1099                         hammer2_inode_t *ip,
1100                         const hammer2_inode_data_t *ripdata,
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_ALGO(ripdata->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                                  ripdata->check_algo);
1122                 if (cluster)
1123                         hammer2_cluster_unlock(cluster);
1124                 break;
1125         case HAMMER2_COMP_AUTOZERO:
1126                 /*
1127                  * Check for zero-fill only
1128                  */
1129                 hammer2_zero_check_and_write(bp, trans, ip,
1130                                     ripdata, cparent, lbase,
1131                                     ioflag, pblksize, errorp,
1132                                     ripdata->check_algo);
1133                 break;
1134         case HAMMER2_COMP_LZ4:
1135         case HAMMER2_COMP_ZLIB:
1136         default:
1137                 /*
1138                  * Check for zero-fill and attempt compression.
1139                  */
1140                 hammer2_compress_and_write(bp, trans, ip,
1141                                            ripdata, cparent,
1142                                            lbase, ioflag,
1143                                            pblksize, errorp,
1144                                            ripdata->comp_algo,
1145                                            ripdata->check_algo);
1146                 break;
1147         }
1148 }
1149
1150 /*
1151  * Generic function that will perform the compression in compression
1152  * write path. The compression algorithm is determined by the settings
1153  * obtained from inode.
1154  */
1155 static
1156 void
1157 hammer2_compress_and_write(struct buf *bp, hammer2_trans_t *trans,
1158         hammer2_inode_t *ip, const hammer2_inode_data_t *ripdata,
1159         hammer2_cluster_t *cparent,
1160         hammer2_key_t lbase, int ioflag, int pblksize,
1161         int *errorp, int comp_algo, int check_algo)
1162 {
1163         hammer2_cluster_t *cluster;
1164         hammer2_chain_t *chain;
1165         int comp_size;
1166         int comp_block_size;
1167         int i;
1168         char *comp_buffer;
1169
1170         if (test_block_zeros(bp->b_data, pblksize)) {
1171                 zero_write(bp, trans, ip, ripdata, cparent, lbase, errorp);
1172                 return;
1173         }
1174
1175         comp_size = 0;
1176         comp_buffer = NULL;
1177
1178         KKASSERT(pblksize / 2 <= 32768);
1179
1180         if (ip->comp_heuristic < 8 || (ip->comp_heuristic & 7) == 0) {
1181                 z_stream strm_compress;
1182                 int comp_level;
1183                 int ret;
1184
1185                 switch(HAMMER2_DEC_ALGO(comp_algo)) {
1186                 case HAMMER2_COMP_LZ4:
1187                         comp_buffer = objcache_get(cache_buffer_write,
1188                                                    M_INTWAIT);
1189                         comp_size = LZ4_compress_limitedOutput(
1190                                         bp->b_data,
1191                                         &comp_buffer[sizeof(int)],
1192                                         pblksize,
1193                                         pblksize / 2 - sizeof(int));
1194                         /*
1195                          * We need to prefix with the size, LZ4
1196                          * doesn't do it for us.  Add the related
1197                          * overhead.
1198                          */
1199                         *(int *)comp_buffer = comp_size;
1200                         if (comp_size)
1201                                 comp_size += sizeof(int);
1202                         break;
1203                 case HAMMER2_COMP_ZLIB:
1204                         comp_level = HAMMER2_DEC_LEVEL(comp_algo);
1205                         if (comp_level == 0)
1206                                 comp_level = 6; /* default zlib compression */
1207                         else if (comp_level < 6)
1208                                 comp_level = 6;
1209                         else if (comp_level > 9)
1210                                 comp_level = 9;
1211                         ret = deflateInit(&strm_compress, comp_level);
1212                         if (ret != Z_OK) {
1213                                 kprintf("HAMMER2 ZLIB: fatal error "
1214                                         "on deflateInit.\n");
1215                         }
1216
1217                         comp_buffer = objcache_get(cache_buffer_write,
1218                                                    M_INTWAIT);
1219                         strm_compress.next_in = bp->b_data;
1220                         strm_compress.avail_in = pblksize;
1221                         strm_compress.next_out = comp_buffer;
1222                         strm_compress.avail_out = pblksize / 2;
1223                         ret = deflate(&strm_compress, Z_FINISH);
1224                         if (ret == Z_STREAM_END) {
1225                                 comp_size = pblksize / 2 -
1226                                             strm_compress.avail_out;
1227                         } else {
1228                                 comp_size = 0;
1229                         }
1230                         ret = deflateEnd(&strm_compress);
1231                         break;
1232                 default:
1233                         kprintf("Error: Unknown compression method.\n");
1234                         kprintf("Comp_method = %d.\n", comp_algo);
1235                         break;
1236                 }
1237         }
1238
1239         if (comp_size == 0) {
1240                 /*
1241                  * compression failed or turned off
1242                  */
1243                 comp_block_size = pblksize;     /* safety */
1244                 if (++ip->comp_heuristic > 128)
1245                         ip->comp_heuristic = 8;
1246         } else {
1247                 /*
1248                  * compression succeeded
1249                  */
1250                 ip->comp_heuristic = 0;
1251                 if (comp_size <= 1024) {
1252                         comp_block_size = 1024;
1253                 } else if (comp_size <= 2048) {
1254                         comp_block_size = 2048;
1255                 } else if (comp_size <= 4096) {
1256                         comp_block_size = 4096;
1257                 } else if (comp_size <= 8192) {
1258                         comp_block_size = 8192;
1259                 } else if (comp_size <= 16384) {
1260                         comp_block_size = 16384;
1261                 } else if (comp_size <= 32768) {
1262                         comp_block_size = 32768;
1263                 } else {
1264                         panic("hammer2: WRITE PATH: "
1265                               "Weird comp_size value.");
1266                         /* NOT REACHED */
1267                         comp_block_size = pblksize;
1268                 }
1269         }
1270
1271         cluster = hammer2_assign_physical(trans, ip, cparent,
1272                                           lbase, comp_block_size,
1273                                           errorp);
1274         ripdata = NULL;
1275
1276         if (*errorp) {
1277                 kprintf("WRITE PATH: An error occurred while "
1278                         "assigning physical space.\n");
1279                 KKASSERT(cluster == NULL);
1280                 goto done;
1281         }
1282
1283         for (i = 0; i < cluster->nchains; ++i) {
1284                 hammer2_inode_data_t *wipdata;
1285                 hammer2_io_t *dio;
1286                 char *bdata;
1287
1288                 chain = cluster->array[i].chain;        /* XXX */
1289                 KKASSERT(chain->flags & HAMMER2_CHAIN_MODIFIED);
1290
1291                 switch(chain->bref.type) {
1292                 case HAMMER2_BREF_TYPE_INODE:
1293                         wipdata = &hammer2_chain_wdata(chain)->ipdata;
1294                         KKASSERT(wipdata->op_flags & HAMMER2_OPFLAG_DIRECTDATA);
1295                         KKASSERT(bp->b_loffset == 0);
1296                         bcopy(bp->b_data, wipdata->u.data,
1297                               HAMMER2_EMBEDDED_BYTES);
1298                         break;
1299                 case HAMMER2_BREF_TYPE_DATA:
1300                         /*
1301                          * Optimize out the read-before-write
1302                          * if possible.
1303                          */
1304                         *errorp = hammer2_io_newnz(chain->hmp,
1305                                                    chain->bref.data_off,
1306                                                    chain->bytes,
1307                                                    &dio);
1308                         if (*errorp) {
1309                                 hammer2_io_brelse(&dio);
1310                                 kprintf("hammer2: WRITE PATH: "
1311                                         "dbp bread error\n");
1312                                 break;
1313                         }
1314                         bdata = hammer2_io_data(dio, chain->bref.data_off);
1315
1316                         /*
1317                          * When loading the block make sure we don't
1318                          * leave garbage after the compressed data.
1319                          */
1320                         if (comp_size) {
1321                                 chain->bref.methods =
1322                                         HAMMER2_ENC_COMP(comp_algo) +
1323                                         HAMMER2_ENC_CHECK(check_algo);
1324                                 bcopy(comp_buffer, bdata, comp_size);
1325                                 if (comp_size != comp_block_size) {
1326                                         bzero(bdata + comp_size,
1327                                               comp_block_size - comp_size);
1328                                 }
1329                         } else {
1330                                 chain->bref.methods =
1331                                         HAMMER2_ENC_COMP(
1332                                                 HAMMER2_COMP_NONE) +
1333                                         HAMMER2_ENC_CHECK(check_algo);
1334                                 bcopy(bp->b_data, bdata, pblksize);
1335                         }
1336
1337                         /*
1338                          * The flush code doesn't calculate check codes for
1339                          * file data (doing so can result in excessive I/O),
1340                          * so we do it here.
1341                          */
1342                         hammer2_chain_setcheck(chain, bdata);
1343
1344                         /*
1345                          * Device buffer is now valid, chain is no longer in
1346                          * the initial state.
1347                          *
1348                          * (No blockref table worries with file data)
1349                          */
1350                         atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL);
1351
1352                         /* Now write the related bdp. */
1353                         if (ioflag & IO_SYNC) {
1354                                 /*
1355                                  * Synchronous I/O requested.
1356                                  */
1357                                 hammer2_io_bwrite(&dio);
1358                         /*
1359                         } else if ((ioflag & IO_DIRECT) &&
1360                                    loff + n == pblksize) {
1361                                 hammer2_io_bdwrite(&dio);
1362                         */
1363                         } else if (ioflag & IO_ASYNC) {
1364                                 hammer2_io_bawrite(&dio);
1365                         } else {
1366                                 hammer2_io_bdwrite(&dio);
1367                         }
1368                         break;
1369                 default:
1370                         panic("hammer2_write_bp: bad chain type %d\n",
1371                                 chain->bref.type);
1372                         /* NOT REACHED */
1373                         break;
1374                 }
1375         }
1376 done:
1377         if (cluster)
1378                 hammer2_cluster_unlock(cluster);
1379         if (comp_buffer)
1380                 objcache_put(cache_buffer_write, comp_buffer);
1381 }
1382
1383 /*
1384  * Function that performs zero-checking and writing without compression,
1385  * it corresponds to default zero-checking path.
1386  */
1387 static
1388 void
1389 hammer2_zero_check_and_write(struct buf *bp, hammer2_trans_t *trans,
1390         hammer2_inode_t *ip, const hammer2_inode_data_t *ripdata,
1391         hammer2_cluster_t *cparent,
1392         hammer2_key_t lbase, int ioflag, int pblksize, int *errorp,
1393         int check_algo)
1394 {
1395         hammer2_cluster_t *cluster;
1396
1397         if (test_block_zeros(bp->b_data, pblksize)) {
1398                 zero_write(bp, trans, ip, ripdata, cparent, lbase, errorp);
1399         } else {
1400                 cluster = hammer2_assign_physical(trans, ip, cparent,
1401                                                   lbase, pblksize, errorp);
1402                 hammer2_write_bp(cluster, bp, ioflag, pblksize, errorp,
1403                                  check_algo);
1404                 if (cluster)
1405                         hammer2_cluster_unlock(cluster);
1406         }
1407 }
1408
1409 /*
1410  * A function to test whether a block of data contains only zeros,
1411  * returns TRUE (non-zero) if the block is all zeros.
1412  */
1413 static
1414 int
1415 test_block_zeros(const char *buf, size_t bytes)
1416 {
1417         size_t i;
1418
1419         for (i = 0; i < bytes; i += sizeof(long)) {
1420                 if (*(const long *)(buf + i) != 0)
1421                         return (0);
1422         }
1423         return (1);
1424 }
1425
1426 /*
1427  * Function to "write" a block that contains only zeros.
1428  */
1429 static
1430 void
1431 zero_write(struct buf *bp, hammer2_trans_t *trans,
1432            hammer2_inode_t *ip, const hammer2_inode_data_t *ripdata,
1433            hammer2_cluster_t *cparent,
1434            hammer2_key_t lbase, int *errorp __unused)
1435 {
1436         hammer2_cluster_t *cluster;
1437         hammer2_media_data_t *data;
1438         hammer2_key_t key_dummy;
1439         int ddflag;
1440
1441         cparent = hammer2_cluster_lookup_init(cparent, 0);
1442         cluster = hammer2_cluster_lookup(cparent, &key_dummy, lbase, lbase,
1443                                      HAMMER2_LOOKUP_NODATA, &ddflag);
1444         if (cluster) {
1445                 data = hammer2_cluster_wdata(cluster);
1446
1447                 if (ddflag) {
1448                         KKASSERT(cluster->focus->flags &
1449                                  HAMMER2_CHAIN_MODIFIED);
1450                         bzero(data->ipdata.u.data, HAMMER2_EMBEDDED_BYTES);
1451                         hammer2_cluster_modsync(cluster);
1452                 } else {
1453                         hammer2_cluster_delete(trans, cparent, cluster,
1454                                                HAMMER2_DELETE_PERMANENT);
1455                 }
1456                 hammer2_cluster_unlock(cluster);
1457         }
1458         hammer2_cluster_lookup_done(cparent);
1459 }
1460
1461 /*
1462  * Function to write the data as it is, without performing any sort of
1463  * compression. This function is used in path without compression and
1464  * default zero-checking path.
1465  */
1466 static
1467 void
1468 hammer2_write_bp(hammer2_cluster_t *cluster, struct buf *bp, int ioflag,
1469                                 int pblksize, int *errorp, int check_algo)
1470 {
1471         hammer2_chain_t *chain;
1472         hammer2_inode_data_t *wipdata;
1473         hammer2_io_t *dio;
1474         char *bdata;
1475         int error;
1476         int i;
1477
1478         error = 0;      /* XXX TODO below */
1479
1480         for (i = 0; i < cluster->nchains; ++i) {
1481                 chain = cluster->array[i].chain;        /* XXX */
1482                 KKASSERT(chain->flags & HAMMER2_CHAIN_MODIFIED);
1483
1484                 switch(chain->bref.type) {
1485                 case HAMMER2_BREF_TYPE_INODE:
1486                         wipdata = &hammer2_chain_wdata(chain)->ipdata;
1487                         KKASSERT(wipdata->op_flags & HAMMER2_OPFLAG_DIRECTDATA);
1488                         KKASSERT(bp->b_loffset == 0);
1489                         bcopy(bp->b_data, wipdata->u.data,
1490                               HAMMER2_EMBEDDED_BYTES);
1491                         error = 0;
1492                         break;
1493                 case HAMMER2_BREF_TYPE_DATA:
1494                         error = hammer2_io_newnz(chain->hmp,
1495                                                  chain->bref.data_off,
1496                                                  chain->bytes, &dio);
1497                         if (error) {
1498                                 hammer2_io_bqrelse(&dio);
1499                                 kprintf("hammer2: WRITE PATH: "
1500                                         "dbp bread error\n");
1501                                 break;
1502                         }
1503                         bdata = hammer2_io_data(dio, chain->bref.data_off);
1504
1505                         chain->bref.methods = HAMMER2_ENC_COMP(
1506                                                         HAMMER2_COMP_NONE) +
1507                                               HAMMER2_ENC_CHECK(check_algo);
1508                         bcopy(bp->b_data, bdata, chain->bytes);
1509
1510                         /*
1511                          * The flush code doesn't calculate check codes for
1512                          * file data (doing so can result in excessive I/O),
1513                          * so we do it here.
1514                          */
1515                         hammer2_chain_setcheck(chain, bdata);
1516
1517                         /*
1518                          * Device buffer is now valid, chain is no longer in
1519                          * the initial state.
1520                          *
1521                          * (No blockref table worries with file data)
1522                          */
1523                         atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL);
1524
1525                         if (ioflag & IO_SYNC) {
1526                                 /*
1527                                  * Synchronous I/O requested.
1528                                  */
1529                                 hammer2_io_bwrite(&dio);
1530                         /*
1531                         } else if ((ioflag & IO_DIRECT) &&
1532                                    loff + n == pblksize) {
1533                                 hammer2_io_bdwrite(&dio);
1534                         */
1535                         } else if (ioflag & IO_ASYNC) {
1536                                 hammer2_io_bawrite(&dio);
1537                         } else {
1538                                 hammer2_io_bdwrite(&dio);
1539                         }
1540                         break;
1541                 default:
1542                         panic("hammer2_write_bp: bad chain type %d\n",
1543                               chain->bref.type);
1544                         /* NOT REACHED */
1545                         error = 0;
1546                         break;
1547                 }
1548                 KKASSERT(error == 0);   /* XXX TODO */
1549         }
1550         *errorp = error;
1551 }
1552
1553 static
1554 int
1555 hammer2_remount(hammer2_mount_t *hmp, struct mount *mp, char *path,
1556                 struct vnode *devvp, struct ucred *cred)
1557 {
1558         int error;
1559
1560         if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
1561                 error = hammer2_recovery(hmp);
1562         } else {
1563                 error = 0;
1564         }
1565         return error;
1566 }
1567
1568 static
1569 int
1570 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1571 {
1572         hammer2_pfsmount_t *pmp;
1573         hammer2_mount_t *hmp;
1574         hammer2_chain_t *rchain;
1575         hammer2_cluster_t *cluster;
1576         int flags;
1577         int error = 0;
1578         int i;
1579
1580         pmp = MPTOPMP(mp);
1581
1582         if (pmp == NULL)
1583                 return(0);
1584
1585         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1586         TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry);
1587
1588         /*
1589          * If mount initialization proceeded far enough we must flush
1590          * its vnodes.
1591          */
1592         if (mntflags & MNT_FORCE)
1593                 flags = FORCECLOSE;
1594         else
1595                 flags = 0;
1596         if (pmp->iroot) {
1597                 error = vflush(mp, 0, flags);
1598                 if (error)
1599                         goto failed;
1600         }
1601
1602         if (pmp->wthread_td) {
1603                 hammer2_mtx_ex(&pmp->wthread_mtx);
1604                 pmp->wthread_destroy = 1;
1605                 wakeup(&pmp->wthread_bioq);
1606                 while (pmp->wthread_destroy != -1) {
1607                         mtxsleep(&pmp->wthread_destroy,
1608                                 &pmp->wthread_mtx, 0,
1609                                 "umount-sleep", 0);
1610                 }
1611                 hammer2_mtx_unlock(&pmp->wthread_mtx);
1612                 pmp->wthread_td = NULL;
1613         }
1614
1615         /*
1616          * Cleanup our reference on ihidden.
1617          */
1618         if (pmp->ihidden) {
1619                 hammer2_inode_drop(pmp->ihidden);
1620                 pmp->ihidden = NULL;
1621         }
1622
1623         /*
1624          * Cleanup our reference on iroot.  iroot is (should) not be needed
1625          * by the flush code.
1626          */
1627         if (pmp->iroot) {
1628                 cluster = &pmp->iroot->cluster;
1629                 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1630                         rchain = pmp->iroot->cluster.array[i].chain;
1631                         if (rchain == NULL)
1632                                 continue;
1633                         hmp = rchain->hmp;
1634                         hammer2_vfs_unmount_hmp1(mp, hmp);
1635
1636                         atomic_clear_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
1637 #if REPORT_REFS_ERRORS
1638                         if (rchain->refs != 1)
1639                                 kprintf("PMP->RCHAIN %p REFS WRONG %d\n",
1640                                         rchain, rchain->refs);
1641 #else
1642                         KKASSERT(rchain->refs == 1);
1643 #endif
1644                         hammer2_chain_drop(rchain);
1645                         cluster->array[i].chain = NULL;
1646                         hammer2_vfs_unmount_hmp2(mp, hmp);
1647                 }
1648                 cluster->focus = NULL;
1649
1650 #if REPORT_REFS_ERRORS
1651                 if (pmp->iroot->refs != 1)
1652                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
1653                                 pmp->iroot, pmp->iroot->refs);
1654 #else
1655                 KKASSERT(pmp->iroot->refs == 1);
1656 #endif
1657                 /* ref for pmp->iroot */
1658                 hammer2_inode_drop(pmp->iroot);
1659                 pmp->iroot = NULL;
1660         }
1661
1662         pmp->mp = NULL;
1663         mp->mnt_data = NULL;
1664
1665         kmalloc_destroy(&pmp->mmsg);
1666         kmalloc_destroy(&pmp->minode);
1667
1668         kfree(pmp, M_HAMMER2);
1669         error = 0;
1670
1671 failed:
1672         lockmgr(&hammer2_mntlk, LK_RELEASE);
1673
1674         return (error);
1675 }
1676
1677 static
1678 void
1679 hammer2_vfs_unmount_hmp1(struct mount *mp, hammer2_mount_t *hmp)
1680 {
1681         hammer2_mount_exlock(hmp);
1682         --hmp->pmp_count;
1683
1684         kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
1685
1686         /*
1687          * Cycle the volume data lock as a safety (probably not needed any
1688          * more).  To ensure everything is out we need to flush at least
1689          * three times.  (1) The running of the unlinkq can dirty the
1690          * filesystem, (2) A normal flush can dirty the freemap, and
1691          * (3) ensure that the freemap is fully synchronized.
1692          *
1693          * The next mount's recovery scan can clean everything up but we want
1694          * to leave the filesystem in a 100% clean state on a normal unmount.
1695          */
1696         hammer2_voldata_lock(hmp);
1697         hammer2_voldata_unlock(hmp);
1698         if (mp->mnt_data) {
1699                 hammer2_vfs_sync(mp, MNT_WAIT);
1700                 hammer2_vfs_sync(mp, MNT_WAIT);
1701                 hammer2_vfs_sync(mp, MNT_WAIT);
1702         }
1703
1704         /*
1705          * XXX chain depend deadlock?
1706          */
1707         hammer2_iocom_uninit(hmp);
1708
1709         if (hmp->pmp_count == 0) {
1710                 if ((hmp->vchain.flags | hmp->fchain.flags) &
1711                     HAMMER2_CHAIN_FLUSH_MASK) {
1712                         kprintf("hammer2_unmount: chains left over "
1713                                 "after final sync\n");
1714                         kprintf("    vchain %08x\n", hmp->vchain.flags);
1715                         kprintf("    fchain %08x\n", hmp->fchain.flags);
1716
1717                         if (hammer2_debug & 0x0010)
1718                                 Debugger("entered debugger");
1719                 }
1720         }
1721 }
1722
1723 static
1724 void
1725 hammer2_vfs_unmount_hmp2(struct mount *mp, hammer2_mount_t *hmp)
1726 {
1727         hammer2_pfsmount_t *spmp;
1728         struct vnode *devvp;
1729         int dumpcnt;
1730         int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
1731
1732         /*
1733          * If no PFS's left drop the master hammer2_mount for the
1734          * device.
1735          */
1736         if (hmp->pmp_count == 0) {
1737                 /*
1738                  * Clean up SPMP and the super-root inode
1739                  */
1740                 spmp = hmp->spmp;
1741                 if (spmp) {
1742                         if (spmp->iroot) {
1743                                 hammer2_inode_drop(spmp->iroot);
1744                                 spmp->iroot = NULL;
1745                         }
1746                         hmp->spmp = NULL;
1747                         kmalloc_destroy(&spmp->mmsg);
1748                         kmalloc_destroy(&spmp->minode);
1749                         kfree(spmp, M_HAMMER2);
1750                 }
1751
1752                 /*
1753                  * Finish up with the device vnode
1754                  */
1755                 if ((devvp = hmp->devvp) != NULL) {
1756                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1757                         vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1758                         hmp->devvp = NULL;
1759                         VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL);
1760                         vn_unlock(devvp);
1761                         vrele(devvp);
1762                         devvp = NULL;
1763                 }
1764
1765                 /*
1766                  * Clear vchain/fchain flags that might prevent final cleanup
1767                  * of these chains.
1768                  */
1769                 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) {
1770                         atomic_clear_int(&hmp->vchain.flags,
1771                                          HAMMER2_CHAIN_MODIFIED);
1772                         hammer2_pfs_memory_wakeup(hmp->vchain.pmp);
1773                         hammer2_chain_drop(&hmp->vchain);
1774                 }
1775                 if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) {
1776                         atomic_clear_int(&hmp->vchain.flags,
1777                                          HAMMER2_CHAIN_UPDATE);
1778                         hammer2_chain_drop(&hmp->vchain);
1779                 }
1780
1781                 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) {
1782                         atomic_clear_int(&hmp->fchain.flags,
1783                                          HAMMER2_CHAIN_MODIFIED);
1784                         hammer2_pfs_memory_wakeup(hmp->fchain.pmp);
1785                         hammer2_chain_drop(&hmp->fchain);
1786                 }
1787                 if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) {
1788                         atomic_clear_int(&hmp->fchain.flags,
1789                                          HAMMER2_CHAIN_UPDATE);
1790                         hammer2_chain_drop(&hmp->fchain);
1791                 }
1792
1793                 /*
1794                  * Final drop of embedded freemap root chain to
1795                  * clean up fchain.core (fchain structure is not
1796                  * flagged ALLOCATED so it is cleaned out and then
1797                  * left to rot).
1798                  */
1799                 hammer2_chain_drop(&hmp->fchain);
1800
1801                 /*
1802                  * Final drop of embedded volume root chain to clean
1803                  * up vchain.core (vchain structure is not flagged
1804                  * ALLOCATED so it is cleaned out and then left to
1805                  * rot).
1806                  */
1807                 dumpcnt = 50;
1808                 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v');
1809                 dumpcnt = 50;
1810                 hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f');
1811                 hammer2_mount_unlock(hmp);
1812                 hammer2_chain_drop(&hmp->vchain);
1813
1814                 hammer2_io_cleanup(hmp, &hmp->iotree);
1815                 if (hmp->iofree_count) {
1816                         kprintf("io_cleanup: %d I/O's left hanging\n",
1817                                 hmp->iofree_count);
1818                 }
1819
1820                 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1821                 kmalloc_destroy(&hmp->mchain);
1822                 kfree(hmp, M_HAMMER2);
1823         } else {
1824                 hammer2_mount_unlock(hmp);
1825         }
1826 }
1827
1828 static
1829 int
1830 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1831              ino_t ino, struct vnode **vpp)
1832 {
1833         kprintf("hammer2_vget\n");
1834         return (EOPNOTSUPP);
1835 }
1836
1837 static
1838 int
1839 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1840 {
1841         hammer2_pfsmount_t *pmp;
1842         hammer2_cluster_t *cparent;
1843         int error;
1844         struct vnode *vp;
1845
1846         pmp = MPTOPMP(mp);
1847         if (pmp->iroot == NULL) {
1848                 *vpp = NULL;
1849                 error = EINVAL;
1850         } else {
1851                 cparent = hammer2_inode_lock_sh(pmp->iroot);
1852                 vp = hammer2_igetv(pmp->iroot, cparent, &error);
1853                 hammer2_inode_unlock_sh(pmp->iroot, cparent);
1854                 *vpp = vp;
1855                 if (vp == NULL)
1856                         kprintf("vnodefail\n");
1857         }
1858
1859         return (error);
1860 }
1861
1862 /*
1863  * Filesystem status
1864  *
1865  * XXX incorporate ipdata->inode_quota and data_quota
1866  */
1867 static
1868 int
1869 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1870 {
1871         hammer2_pfsmount_t *pmp;
1872         hammer2_mount_t *hmp;
1873
1874         pmp = MPTOPMP(mp);
1875         KKASSERT(pmp->iroot->cluster.nchains >= 1);
1876         hmp = pmp->iroot->cluster.focus->hmp;   /* XXX */
1877
1878         mp->mnt_stat.f_files = pmp->inode_count;
1879         mp->mnt_stat.f_ffree = 0;
1880         mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
1881         mp->mnt_stat.f_bfree =  hmp->voldata.allocator_free / HAMMER2_PBUFSIZE;
1882         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1883
1884         *sbp = mp->mnt_stat;
1885         return (0);
1886 }
1887
1888 static
1889 int
1890 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1891 {
1892         hammer2_pfsmount_t *pmp;
1893         hammer2_mount_t *hmp;
1894
1895         pmp = MPTOPMP(mp);
1896         KKASSERT(pmp->iroot->cluster.nchains >= 1);
1897         hmp = pmp->iroot->cluster.focus->hmp;   /* XXX */
1898
1899         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1900         mp->mnt_vstat.f_files = pmp->inode_count;
1901         mp->mnt_vstat.f_ffree = 0;
1902         mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
1903         mp->mnt_vstat.f_bfree =  hmp->voldata.allocator_free / HAMMER2_PBUFSIZE;
1904         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1905
1906         *sbp = mp->mnt_vstat;
1907         return (0);
1908 }
1909
1910 /*
1911  * Mount-time recovery (RW mounts)
1912  *
1913  * Updates to the free block table are allowed to lag flushes by one
1914  * transaction.  In case of a crash, then on a fresh mount we must do an
1915  * incremental scan of the last committed transaction id and make sure that
1916  * all related blocks have been marked allocated.
1917  *
1918  * The super-root topology and each PFS has its own transaction id domain,
1919  * so we must track PFS boundary transitions.
1920  */
1921 struct hammer2_recovery_elm {
1922         TAILQ_ENTRY(hammer2_recovery_elm) entry;
1923         hammer2_chain_t *chain;
1924         hammer2_tid_t sync_tid;
1925 };
1926
1927 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm);
1928
1929 struct hammer2_recovery_info {
1930         struct hammer2_recovery_list list;
1931         int     depth;
1932 };
1933
1934 static int hammer2_recovery_scan(hammer2_trans_t *trans, hammer2_mount_t *hmp,
1935                         hammer2_chain_t *parent,
1936                         struct hammer2_recovery_info *info,
1937                         hammer2_tid_t sync_tid);
1938
1939 #define HAMMER2_RECOVERY_MAXDEPTH       10
1940
1941 static
1942 int
1943 hammer2_recovery(hammer2_mount_t *hmp)
1944 {
1945         hammer2_trans_t trans;
1946         struct hammer2_recovery_info info;
1947         struct hammer2_recovery_elm *elm;
1948         hammer2_chain_t *parent;
1949         hammer2_tid_t sync_tid;
1950         int error;
1951         int cumulative_error = 0;
1952
1953         hammer2_trans_init(&trans, hmp->spmp, 0);
1954
1955         sync_tid = 0;
1956         TAILQ_INIT(&info.list);
1957         info.depth = 0;
1958         parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1959         cumulative_error = hammer2_recovery_scan(&trans, hmp, parent,
1960                                                  &info, sync_tid);
1961         hammer2_chain_lookup_done(parent);
1962
1963         while ((elm = TAILQ_FIRST(&info.list)) != NULL) {
1964                 TAILQ_REMOVE(&info.list, elm, entry);
1965                 parent = elm->chain;
1966                 sync_tid = elm->sync_tid;
1967                 kfree(elm, M_HAMMER2);
1968
1969                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS |
1970                                            HAMMER2_RESOLVE_NOREF);
1971                 error = hammer2_recovery_scan(&trans, hmp, parent,
1972                                               &info, sync_tid);
1973                 hammer2_chain_unlock(parent);
1974                 if (error)
1975                         cumulative_error = error;
1976         }
1977         hammer2_trans_done(&trans);
1978
1979         return cumulative_error;
1980 }
1981
1982 static
1983 int
1984 hammer2_recovery_scan(hammer2_trans_t *trans, hammer2_mount_t *hmp,
1985                       hammer2_chain_t *parent,
1986                       struct hammer2_recovery_info *info,
1987                       hammer2_tid_t sync_tid)
1988 {
1989         const hammer2_inode_data_t *ripdata;
1990         hammer2_chain_t *chain;
1991         int cache_index;
1992         int cumulative_error = 0;
1993         int pfs_boundary = 0;
1994         int error;
1995
1996         /*
1997          * Adjust freemap to ensure that the block(s) are marked allocated.
1998          */
1999         if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) {
2000                 hammer2_freemap_adjust(trans, hmp, &parent->bref,
2001                                        HAMMER2_FREEMAP_DORECOVER);
2002         }
2003
2004         /*
2005          * Check type for recursive scan
2006          */
2007         switch(parent->bref.type) {
2008         case HAMMER2_BREF_TYPE_VOLUME:
2009                 /* data already instantiated */
2010                 break;
2011         case HAMMER2_BREF_TYPE_INODE:
2012                 /*
2013                  * Must instantiate data for DIRECTDATA test and also
2014                  * for recursion.
2015                  */
2016                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2017                 ripdata = &hammer2_chain_rdata(parent)->ipdata;
2018                 if (ripdata->op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
2019                         /* not applicable to recovery scan */
2020                         hammer2_chain_unlock(parent);
2021                         return 0;
2022                 }
2023                 if ((ripdata->op_flags & HAMMER2_OPFLAG_PFSROOT) &&
2024                     info->depth != 0) {
2025                         pfs_boundary = 1;
2026                         sync_tid = parent->bref.mirror_tid - 1;
2027                 }
2028                 hammer2_chain_unlock(parent);
2029                 break;
2030         case HAMMER2_BREF_TYPE_INDIRECT:
2031                 /*
2032                  * Must instantiate data for recursion
2033                  */
2034                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2035                 hammer2_chain_unlock(parent);
2036                 break;
2037         case HAMMER2_BREF_TYPE_DATA:
2038         case HAMMER2_BREF_TYPE_FREEMAP:
2039         case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2040         case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
2041                 /* not applicable to recovery scan */
2042                 return 0;
2043                 break;
2044         default:
2045                 return EDOM;
2046         }
2047
2048         /*
2049          * Defer operation if depth limit reached or if we are crossing a
2050          * PFS boundary.
2051          */
2052         if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH || pfs_boundary) {
2053                 struct hammer2_recovery_elm *elm;
2054
2055                 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK);
2056                 elm->chain = parent;
2057                 elm->sync_tid = sync_tid;
2058                 hammer2_chain_ref(parent);
2059                 TAILQ_INSERT_TAIL(&info->list, elm, entry);
2060                 /* unlocked by caller */
2061
2062                 return(0);
2063         }
2064
2065
2066         /*
2067          * Recursive scan of the last flushed transaction only.  We are
2068          * doing this without pmp assignments so don't leave the chains
2069          * hanging around after we are done with them.
2070          */
2071         cache_index = 0;
2072         chain = hammer2_chain_scan(parent, NULL, &cache_index,
2073                                    HAMMER2_LOOKUP_NODATA);
2074         while (chain) {
2075                 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
2076                 if (chain->bref.mirror_tid >= sync_tid) {
2077                         ++info->depth;
2078                         error = hammer2_recovery_scan(trans, hmp, chain,
2079                                                       info, sync_tid);
2080                         --info->depth;
2081                         if (error)
2082                                 cumulative_error = error;
2083                 }
2084                 chain = hammer2_chain_scan(parent, chain, &cache_index,
2085                                            HAMMER2_LOOKUP_NODATA);
2086         }
2087
2088         return cumulative_error;
2089 }
2090
2091 /*
2092  * Sync the entire filesystem; this is called from the filesystem syncer
2093  * process periodically and whenever a user calls sync(1) on the hammer
2094  * mountpoint.
2095  *
2096  * Currently is actually called from the syncer! \o/
2097  *
2098  * This task will have to snapshot the state of the dirty inode chain.
2099  * From that, it will have to make sure all of the inodes on the dirty
2100  * chain have IO initiated. We make sure that io is initiated for the root
2101  * block.
2102  *
2103  * If waitfor is set, we wait for media to acknowledge the new rootblock.
2104  *
2105  * THINKS: side A vs side B, to have sync not stall all I/O?
2106  */
2107 int
2108 hammer2_vfs_sync(struct mount *mp, int waitfor)
2109 {
2110         struct hammer2_sync_info info;
2111         hammer2_inode_t *iroot;
2112         hammer2_chain_t *chain;
2113         hammer2_chain_t *parent;
2114         hammer2_pfsmount_t *pmp;
2115         hammer2_mount_t *hmp;
2116         int flags;
2117         int error;
2118         int total_error;
2119         int force_fchain;
2120         int i;
2121         int j;
2122
2123         pmp = MPTOPMP(mp);
2124         iroot = pmp->iroot;
2125         KKASSERT(iroot);
2126         KKASSERT(iroot->pmp == pmp);
2127
2128         /*
2129          * We can't acquire locks on existing vnodes while in a transaction
2130          * without risking a deadlock.  This assumes that vfsync() can be
2131          * called without the vnode locked (which it can in DragonFly).
2132          * Otherwise we'd have to implement a multi-pass or flag the lock
2133          * failures and retry.
2134          *
2135          * The reclamation code interlocks with the sync list's token
2136          * (by removing the vnode from the scan list) before unlocking
2137          * the inode, giving us time to ref the inode.
2138          */
2139         /*flags = VMSC_GETVP;*/
2140         flags = 0;
2141         if (waitfor & MNT_LAZY)
2142                 flags |= VMSC_ONEPASS;
2143
2144         /*
2145          * Start our flush transaction.  This does not return until all
2146          * concurrent transactions have completed and will prevent any
2147          * new transactions from running concurrently, except for the
2148          * buffer cache transactions.
2149          *
2150          * For efficiency do an async pass before making sure with a
2151          * synchronous pass on all related buffer cache buffers.  It
2152          * should theoretically not be possible for any new file buffers
2153          * to be instantiated during this sequence.
2154          */
2155         hammer2_trans_init(&info.trans, pmp, HAMMER2_TRANS_ISFLUSH |
2156                                              HAMMER2_TRANS_PREFLUSH);
2157         hammer2_run_unlinkq(&info.trans, pmp);
2158
2159         info.error = 0;
2160         info.waitfor = MNT_NOWAIT;
2161         vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2162         info.waitfor = MNT_WAIT;
2163         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2164
2165         /*
2166          * Clear PREFLUSH.  This prevents (or asserts on) any new logical
2167          * buffer cache flushes which occur during the flush.  Device buffers
2168          * are not affected.
2169          */
2170
2171 #if 0
2172         if (info.error == 0 && (waitfor & MNT_WAIT)) {
2173                 info.waitfor = waitfor;
2174                     vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2175
2176         }
2177 #endif
2178         hammer2_bioq_sync(info.trans.pmp);
2179         atomic_clear_int(&info.trans.flags, HAMMER2_TRANS_PREFLUSH);
2180
2181         total_error = 0;
2182
2183         /*
2184          * Flush all storage elements making up the cluster
2185          *
2186          * We must also flush any deleted siblings because the super-root
2187          * flush won't do it for us.  They all must be staged or the
2188          * super-root flush will not be able to update its block table
2189          * properly.
2190          *
2191          * XXX currently done serially instead of concurrently
2192          */
2193         for (i = 0; iroot && i < iroot->cluster.nchains; ++i) {
2194                 chain = iroot->cluster.array[i].chain;
2195                 if (chain) {
2196                         hammer2_chain_lock(chain, HAMMER2_RESOLVE_ALWAYS);
2197                         hammer2_flush(&info.trans, chain);
2198                         hammer2_chain_unlock(chain);
2199                 }
2200         }
2201 #if 0
2202         hammer2_trans_done(&info.trans);
2203 #endif
2204
2205         /*
2206          * Flush all volume roots to synchronize PFS flushes with the
2207          * storage media.  Use a super-root transaction for each one.
2208          *
2209          * The flush code will detect super-root -> pfs-root chain
2210          * transitions using the last pfs-root flush.
2211          */
2212         for (i = 0; iroot && i < iroot->cluster.nchains; ++i) {
2213                 hammer2_chain_t *tmp;
2214
2215                 chain = iroot->cluster.array[i].chain;
2216                 if (chain == NULL)
2217                         continue;
2218
2219                 hmp = chain->hmp;
2220
2221                 /*
2222                  * We only have to flush each hmp once
2223                  */
2224                 for (j = i - 1; j >= 0; --j) {
2225                         if ((tmp = iroot->cluster.array[j].chain) != NULL) {
2226                                 if (tmp->hmp == hmp)
2227                                         break;
2228                         }
2229                 }
2230                 if (j >= 0)
2231                         continue;
2232                 hammer2_trans_spmp(&info.trans, hmp->spmp);
2233
2234                 /*
2235                  * Force an update of the XID from the PFS root to the
2236                  * topology root.  We couldn't do this from the PFS
2237                  * transaction because a SPMP transaction is needed.
2238                  * This does not modify blocks, instead what it does is
2239                  * allow the flush code to find the transition point and
2240                  * then update on the way back up.
2241                  */
2242                 parent = chain->parent;
2243                 KKASSERT(chain->pmp != parent->pmp);
2244                 hammer2_chain_setflush(&info.trans, parent);
2245
2246                 /*
2247                  * Media mounts have two 'roots', vchain for the topology
2248                  * and fchain for the free block table.  Flush both.
2249                  *
2250                  * Note that the topology and free block table are handled
2251                  * independently, so the free block table can wind up being
2252                  * ahead of the topology.  We depend on the bulk free scan
2253                  * code to deal with any loose ends.
2254                  */
2255                 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
2256                 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
2257                 if (hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
2258                         /*
2259                          * This will also modify vchain as a side effect,
2260                          * mark vchain as modified now.
2261                          */
2262                         hammer2_voldata_modify(hmp);
2263                         chain = &hmp->fchain;
2264                         hammer2_flush(&info.trans, chain);
2265                         KKASSERT(chain == &hmp->fchain);
2266                 }
2267                 hammer2_chain_unlock(&hmp->fchain);
2268                 hammer2_chain_unlock(&hmp->vchain);
2269
2270                 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
2271                 if (hmp->vchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
2272                         chain = &hmp->vchain;
2273                         hammer2_flush(&info.trans, chain);
2274                         KKASSERT(chain == &hmp->vchain);
2275                         force_fchain = 1;
2276                 } else {
2277                         force_fchain = 0;
2278                 }
2279                 hammer2_chain_unlock(&hmp->vchain);
2280
2281 #if 0
2282                 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
2283                 if ((hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_MASK) ||
2284                     force_fchain) {
2285                         /* this will also modify vchain as a side effect */
2286                         chain = &hmp->fchain;
2287                         hammer2_flush(&info.trans, chain);
2288                         KKASSERT(chain == &hmp->fchain);
2289                 }
2290                 hammer2_chain_unlock(&hmp->fchain);
2291 #endif
2292
2293                 error = 0;
2294
2295                 /*
2296                  * We can't safely flush the volume header until we have
2297                  * flushed any device buffers which have built up.
2298                  *
2299                  * XXX this isn't being incremental
2300                  */
2301                 vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
2302                 error = VOP_FSYNC(hmp->devvp, MNT_WAIT, 0);
2303                 vn_unlock(hmp->devvp);
2304
2305                 /*
2306                  * The flush code sets CHAIN_VOLUMESYNC to indicate that the
2307                  * volume header needs synchronization via hmp->volsync.
2308                  *
2309                  * XXX synchronize the flag & data with only this flush XXX
2310                  */
2311                 if (error == 0 &&
2312                     (hmp->vchain.flags & HAMMER2_CHAIN_VOLUMESYNC)) {
2313                         struct buf *bp;
2314
2315                         /*
2316                          * Synchronize the disk before flushing the volume
2317                          * header.
2318                          */
2319                         bp = getpbuf(NULL);
2320                         bp->b_bio1.bio_offset = 0;
2321                         bp->b_bufsize = 0;
2322                         bp->b_bcount = 0;
2323                         bp->b_cmd = BUF_CMD_FLUSH;
2324                         bp->b_bio1.bio_done = biodone_sync;
2325                         bp->b_bio1.bio_flags |= BIO_SYNC;
2326                         vn_strategy(hmp->devvp, &bp->b_bio1);
2327                         biowait(&bp->b_bio1, "h2vol");
2328                         relpbuf(bp, NULL);
2329
2330                         /*
2331                          * Then we can safely flush the version of the
2332                          * volume header synchronized by the flush code.
2333                          */
2334                         i = hmp->volhdrno + 1;
2335                         if (i >= HAMMER2_NUM_VOLHDRS)
2336                                 i = 0;
2337                         if (i * HAMMER2_ZONE_BYTES64 + HAMMER2_SEGSIZE >
2338                             hmp->volsync.volu_size) {
2339                                 i = 0;
2340                         }
2341                         kprintf("sync volhdr %d %jd\n",
2342                                 i, (intmax_t)hmp->volsync.volu_size);
2343                         bp = getblk(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2344                                     HAMMER2_PBUFSIZE, 0, 0);
2345                         atomic_clear_int(&hmp->vchain.flags,
2346                                          HAMMER2_CHAIN_VOLUMESYNC);
2347                         bcopy(&hmp->volsync, bp->b_data, HAMMER2_PBUFSIZE);
2348                         bawrite(bp);
2349                         hmp->volhdrno = i;
2350                 }
2351                 if (error)
2352                         total_error = error;
2353
2354 #if 0
2355                 hammer2_trans_done(&info.trans);
2356 #endif
2357         }
2358         hammer2_trans_done(&info.trans);
2359
2360         return (total_error);
2361 }
2362
2363 /*
2364  * Sync passes.
2365  */
2366 static int
2367 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
2368 {
2369         struct hammer2_sync_info *info = data;
2370         hammer2_inode_t *ip;
2371         int error;
2372
2373         /*
2374          *
2375          */
2376         ip = VTOI(vp);
2377         if (ip == NULL)
2378                 return(0);
2379         if (vp->v_type == VNON || vp->v_type == VBAD) {
2380                 vclrisdirty(vp);
2381                 return(0);
2382         }
2383         if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
2384             RB_EMPTY(&vp->v_rbdirty_tree)) {
2385                 vclrisdirty(vp);
2386                 return(0);
2387         }
2388
2389         /*
2390          * VOP_FSYNC will start a new transaction so replicate some code
2391          * here to do it inline (see hammer2_vop_fsync()).
2392          *
2393          * WARNING: The vfsync interacts with the buffer cache and might
2394          *          block, we can't hold the inode lock at that time.
2395          *          However, we MUST ref ip before blocking to ensure that
2396          *          it isn't ripped out from under us (since we do not
2397          *          hold a lock on the vnode).
2398          */
2399         hammer2_inode_ref(ip);
2400         atomic_clear_int(&ip->flags, HAMMER2_INODE_MODIFIED);
2401         if (vp)
2402                 vfsync(vp, MNT_NOWAIT, 1, NULL, NULL);
2403
2404         hammer2_inode_drop(ip);
2405 #if 1
2406         error = 0;
2407         if (error)
2408                 info->error = error;
2409 #endif
2410         return(0);
2411 }
2412
2413 static
2414 int
2415 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
2416 {
2417         return (0);
2418 }
2419
2420 static
2421 int
2422 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
2423                struct fid *fhp, struct vnode **vpp)
2424 {
2425         return (0);
2426 }
2427
2428 static
2429 int
2430 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
2431                  int *exflagsp, struct ucred **credanonp)
2432 {
2433         return (0);
2434 }
2435
2436 /*
2437  * Support code for hammer2_vfs_mount().  Read, verify, and install the volume
2438  * header into the HMP
2439  *
2440  * XXX read four volhdrs and use the one with the highest TID whos CRC
2441  *     matches.
2442  *
2443  * XXX check iCRCs.
2444  *
2445  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
2446  *     nonexistant locations.
2447  *
2448  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
2449  */
2450 static
2451 int
2452 hammer2_install_volume_header(hammer2_mount_t *hmp)
2453 {
2454         hammer2_volume_data_t *vd;
2455         struct buf *bp;
2456         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
2457         int error_reported;
2458         int error;
2459         int valid;
2460         int i;
2461
2462         error_reported = 0;
2463         error = 0;
2464         valid = 0;
2465         bp = NULL;
2466
2467         /*
2468          * There are up to 4 copies of the volume header (syncs iterate
2469          * between them so there is no single master).  We don't trust the
2470          * volu_size field so we don't know precisely how large the filesystem
2471          * is, so depend on the OS to return an error if we go beyond the
2472          * block device's EOF.
2473          */
2474         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
2475                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2476                               HAMMER2_VOLUME_BYTES, &bp);
2477                 if (error) {
2478                         brelse(bp);
2479                         bp = NULL;
2480                         continue;
2481                 }
2482
2483                 vd = (struct hammer2_volume_data *) bp->b_data;
2484                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
2485                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
2486                         brelse(bp);
2487                         bp = NULL;
2488                         continue;
2489                 }
2490
2491                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
2492                         /* XXX: Reversed-endianness filesystem */
2493                         kprintf("hammer2: reverse-endian filesystem detected");
2494                         brelse(bp);
2495                         bp = NULL;
2496                         continue;
2497                 }
2498
2499                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
2500                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
2501                                       HAMMER2_VOLUME_ICRC0_SIZE);
2502                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
2503                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
2504                                        HAMMER2_VOLUME_ICRC1_SIZE);
2505                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
2506                         kprintf("hammer2 volume header crc "
2507                                 "mismatch copy #%d %08x/%08x\n",
2508                                 i, crc0, crc);
2509                         error_reported = 1;
2510                         brelse(bp);
2511                         bp = NULL;
2512                         continue;
2513                 }
2514                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
2515                         valid = 1;
2516                         hmp->voldata = *vd;
2517                         hmp->volhdrno = i;
2518                 }
2519                 brelse(bp);
2520                 bp = NULL;
2521         }
2522         if (valid) {
2523                 hmp->volsync = hmp->voldata;
2524                 error = 0;
2525                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
2526                         kprintf("hammer2: using volume header #%d\n",
2527                                 hmp->volhdrno);
2528                 }
2529         } else {
2530                 error = EINVAL;
2531                 kprintf("hammer2: no valid volume headers found!\n");
2532         }
2533         return (error);
2534 }
2535
2536 /*
2537  * This handles hysteresis on regular file flushes.  Because the BIOs are
2538  * routed to a thread it is possible for an excessive number to build up
2539  * and cause long front-end stalls long before the runningbuffspace limit
2540  * is hit, so we implement hammer2_flush_pipe to control the
2541  * hysteresis.
2542  *
2543  * This is a particular problem when compression is used.
2544  */
2545 void
2546 hammer2_lwinprog_ref(hammer2_pfsmount_t *pmp)
2547 {
2548         atomic_add_int(&pmp->count_lwinprog, 1);
2549 }
2550
2551 void
2552 hammer2_lwinprog_drop(hammer2_pfsmount_t *pmp)
2553 {
2554         int lwinprog;
2555
2556         lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1);
2557         if ((lwinprog & HAMMER2_LWINPROG_WAITING) &&
2558             (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) {
2559                 atomic_clear_int(&pmp->count_lwinprog,
2560                                  HAMMER2_LWINPROG_WAITING);
2561                 wakeup(&pmp->count_lwinprog);
2562         }
2563 }
2564
2565 void
2566 hammer2_lwinprog_wait(hammer2_pfsmount_t *pmp)
2567 {
2568         int lwinprog;
2569
2570         for (;;) {
2571                 lwinprog = pmp->count_lwinprog;
2572                 cpu_ccfence();
2573                 if ((lwinprog & HAMMER2_LWINPROG_MASK) < hammer2_flush_pipe)
2574                         break;
2575                 tsleep_interlock(&pmp->count_lwinprog, 0);
2576                 atomic_set_int(&pmp->count_lwinprog, HAMMER2_LWINPROG_WAITING);
2577                 lwinprog = pmp->count_lwinprog;
2578                 if ((lwinprog & HAMMER2_LWINPROG_MASK) < hammer2_flush_pipe)
2579                         break;
2580                 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz);
2581         }
2582 }
2583
2584 /*
2585  * Manage excessive memory resource use for chain and related
2586  * structures.
2587  */
2588 void
2589 hammer2_pfs_memory_wait(hammer2_pfsmount_t *pmp)
2590 {
2591         uint32_t waiting;
2592         uint32_t count;
2593         uint32_t limit;
2594 #if 0
2595         static int zzticks;
2596 #endif
2597
2598         /*
2599          * Atomic check condition and wait.  Also do an early speedup of
2600          * the syncer to try to avoid hitting the wait.
2601          */
2602         for (;;) {
2603                 waiting = pmp->inmem_dirty_chains;
2604                 cpu_ccfence();
2605                 count = waiting & HAMMER2_DIRTYCHAIN_MASK;
2606
2607                 limit = pmp->mp->mnt_nvnodelistsize / 10;
2608                 if (limit < hammer2_limit_dirty_chains)
2609                         limit = hammer2_limit_dirty_chains;
2610                 if (limit < 1000)
2611                         limit = 1000;
2612
2613 #if 0
2614                 if ((int)(ticks - zzticks) > hz) {
2615                         zzticks = ticks;
2616                         kprintf("count %ld %ld\n", count, limit);
2617                 }
2618 #endif
2619
2620                 /*
2621                  * Block if there are too many dirty chains present, wait
2622                  * for the flush to clean some out.
2623                  */
2624                 if (count > limit) {
2625                         tsleep_interlock(&pmp->inmem_dirty_chains, 0);
2626                         if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2627                                                waiting,
2628                                        waiting | HAMMER2_DIRTYCHAIN_WAITING)) {
2629                                 speedup_syncer(pmp->mp);
2630                                 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED,
2631                                        "chnmem", hz);
2632                         }
2633                         continue;       /* loop on success or fail */
2634                 }
2635
2636                 /*
2637                  * Try to start an early flush before we are forced to block.
2638                  */
2639                 if (count > limit * 7 / 10)
2640                         speedup_syncer(pmp->mp);
2641                 break;
2642         }
2643 }
2644
2645 void
2646 hammer2_pfs_memory_inc(hammer2_pfsmount_t *pmp)
2647 {
2648         if (pmp) {
2649                 atomic_add_int(&pmp->inmem_dirty_chains, 1);
2650         }
2651 }
2652
2653 void
2654 hammer2_pfs_memory_wakeup(hammer2_pfsmount_t *pmp)
2655 {
2656         uint32_t waiting;
2657
2658         if (pmp == NULL)
2659                 return;
2660
2661         for (;;) {
2662                 waiting = pmp->inmem_dirty_chains;
2663                 cpu_ccfence();
2664                 if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2665                                        waiting,
2666                                        (waiting - 1) &
2667                                         ~HAMMER2_DIRTYCHAIN_WAITING)) {
2668                         break;
2669                 }
2670         }
2671
2672         if (waiting & HAMMER2_DIRTYCHAIN_WAITING)
2673                 wakeup(&pmp->inmem_dirty_chains);
2674 }
2675
2676 /*
2677  * Debugging
2678  */
2679 void
2680 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx)
2681 {
2682         hammer2_chain_t *scan;
2683         hammer2_chain_t *parent;
2684
2685         --*countp;
2686         if (*countp == 0) {
2687                 kprintf("%*.*s...\n", tab, tab, "");
2688                 return;
2689         }
2690         if (*countp < 0)
2691                 return;
2692         kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n",
2693                 tab, tab, "", pfx,
2694                 chain, chain->bref.type,
2695                 chain->bref.key, chain->bref.keybits,
2696                 chain->bref.mirror_tid);
2697
2698         kprintf("%*.*s      [%08x] (%s) refs=%d\n",
2699                 tab, tab, "",
2700                 chain->flags,
2701                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
2702                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
2703                 chain->refs);
2704
2705         kprintf("%*.*s      core [%08x]",
2706                 tab, tab, "",
2707                 chain->core.flags);
2708
2709         parent = chain->parent;
2710         if (parent)
2711                 kprintf("\n%*.*s      p=%p [pflags %08x prefs %d",
2712                         tab, tab, "",
2713                         parent, parent->flags, parent->refs);
2714         if (RB_EMPTY(&chain->core.rbtree)) {
2715                 kprintf("\n");
2716         } else {
2717                 kprintf(" {\n");
2718                 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree)
2719                         hammer2_dump_chain(scan, tab + 4, countp, 'a');
2720                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
2721                         kprintf("%*.*s}(%s)\n", tab, tab, "",
2722                                 chain->data->ipdata.filename);
2723                 else
2724                         kprintf("%*.*s}\n", tab, tab, "");
2725         }
2726 }