sys/vfs/hammer/hammer_vnops.c

   1 /*
   2  * Copyright (c) 2007-2008 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/fcntl.h>
  39 #include <sys/namecache.h>
  40 #include <sys/vnode.h>
  41 #include <sys/lockf.h>
  42 #include <sys/event.h>
  43 #include <sys/stat.h>
  44 #include <sys/dirent.h>
  45 #include <sys/file.h>
  46 #include <vm/vm_extern.h>
  47 #include <vm/swap_pager.h>
  48 #include <vfs/fifofs/fifo.h>
  49
  50 #include "hammer.h"
  51
  52 /*
  53  * USERFS VNOPS
  54  */
  55 /*static int hammer_vop_vnoperate(struct vop_generic_args *);*/
  56 static int hammer_vop_fsync(struct vop_fsync_args *);
  57 static int hammer_vop_read(struct vop_read_args *);
  58 static int hammer_vop_write(struct vop_write_args *);
  59 static int hammer_vop_access(struct vop_access_args *);
  60 static int hammer_vop_advlock(struct vop_advlock_args *);
  61 static int hammer_vop_close(struct vop_close_args *);
  62 static int hammer_vop_ncreate(struct vop_ncreate_args *);
  63 static int hammer_vop_getattr(struct vop_getattr_args *);
  64 static int hammer_vop_nresolve(struct vop_nresolve_args *);
  65 static int hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *);
  66 static int hammer_vop_nlink(struct vop_nlink_args *);
  67 static int hammer_vop_nmkdir(struct vop_nmkdir_args *);
  68 static int hammer_vop_nmknod(struct vop_nmknod_args *);
  69 static int hammer_vop_open(struct vop_open_args *);
  70 static int hammer_vop_print(struct vop_print_args *);
  71 static int hammer_vop_readdir(struct vop_readdir_args *);
  72 static int hammer_vop_readlink(struct vop_readlink_args *);
  73 static int hammer_vop_nremove(struct vop_nremove_args *);
  74 static int hammer_vop_nrename(struct vop_nrename_args *);
  75 static int hammer_vop_nrmdir(struct vop_nrmdir_args *);
  76 static int hammer_vop_markatime(struct vop_markatime_args *);
  77 static int hammer_vop_setattr(struct vop_setattr_args *);
  78 static int hammer_vop_strategy(struct vop_strategy_args *);
  79 static int hammer_vop_bmap(struct vop_bmap_args *ap);
  80 static int hammer_vop_nsymlink(struct vop_nsymlink_args *);
  81 static int hammer_vop_nwhiteout(struct vop_nwhiteout_args *);
  82 static int hammer_vop_ioctl(struct vop_ioctl_args *);
  83 static int hammer_vop_mountctl(struct vop_mountctl_args *);
  84 static int hammer_vop_kqfilter (struct vop_kqfilter_args *);
  85
  86 static int hammer_vop_fifoclose (struct vop_close_args *);
  87 static int hammer_vop_fiforead (struct vop_read_args *);
  88 static int hammer_vop_fifowrite (struct vop_write_args *);
  89 static int hammer_vop_fifokqfilter (struct vop_kqfilter_args *);
  90
  91 struct vop_ops hammer_vnode_vops = {
  92         .vop_default =          vop_defaultop,
  93         .vop_fsync =            hammer_vop_fsync,
  94         .vop_getpages =         vop_stdgetpages,
  95         .vop_putpages =         vop_stdputpages,
  96         .vop_read =             hammer_vop_read,
  97         .vop_write =            hammer_vop_write,
  98         .vop_access =           hammer_vop_access,
  99         .vop_advlock =          hammer_vop_advlock,
 100         .vop_close =            hammer_vop_close,
 101         .vop_ncreate =          hammer_vop_ncreate,
 102         .vop_getattr =          hammer_vop_getattr,
 103         .vop_inactive =         hammer_vop_inactive,
 104         .vop_reclaim =          hammer_vop_reclaim,
 105         .vop_nresolve =         hammer_vop_nresolve,
 106         .vop_nlookupdotdot =    hammer_vop_nlookupdotdot,
 107         .vop_nlink =            hammer_vop_nlink,
 108         .vop_nmkdir =           hammer_vop_nmkdir,
 109         .vop_nmknod =           hammer_vop_nmknod,
 110         .vop_open =             hammer_vop_open,
 111         .vop_pathconf =         vop_stdpathconf,
 112         .vop_print =            hammer_vop_print,
 113         .vop_readdir =          hammer_vop_readdir,
 114         .vop_readlink =         hammer_vop_readlink,
 115         .vop_nremove =          hammer_vop_nremove,
 116         .vop_nrename =          hammer_vop_nrename,
 117         .vop_nrmdir =           hammer_vop_nrmdir,
 118         .vop_markatime =        hammer_vop_markatime,
 119         .vop_setattr =          hammer_vop_setattr,
 120         .vop_bmap =             hammer_vop_bmap,
 121         .vop_strategy =         hammer_vop_strategy,
 122         .vop_nsymlink =         hammer_vop_nsymlink,
 123         .vop_nwhiteout =        hammer_vop_nwhiteout,
 124         .vop_ioctl =            hammer_vop_ioctl,
 125         .vop_mountctl =         hammer_vop_mountctl,
 126         .vop_kqfilter =         hammer_vop_kqfilter
 127 };
 128
 129 struct vop_ops hammer_spec_vops = {
 130         .vop_default =          vop_defaultop,
 131         .vop_fsync =            hammer_vop_fsync,
 132         .vop_read =             vop_stdnoread,
 133         .vop_write =            vop_stdnowrite,
 134         .vop_access =           hammer_vop_access,
 135         .vop_close =            hammer_vop_close,
 136         .vop_markatime =        hammer_vop_markatime,
 137         .vop_getattr =          hammer_vop_getattr,
 138         .vop_inactive =         hammer_vop_inactive,
 139         .vop_reclaim =          hammer_vop_reclaim,
 140         .vop_setattr =          hammer_vop_setattr
 141 };
 142
 143 struct vop_ops hammer_fifo_vops = {
 144         .vop_default =          fifo_vnoperate,
 145         .vop_fsync =            hammer_vop_fsync,
 146         .vop_read =             hammer_vop_fiforead,
 147         .vop_write =            hammer_vop_fifowrite,
 148         .vop_access =           hammer_vop_access,
 149         .vop_close =            hammer_vop_fifoclose,
 150         .vop_markatime =        hammer_vop_markatime,
 151         .vop_getattr =          hammer_vop_getattr,
 152         .vop_inactive =         hammer_vop_inactive,
 153         .vop_reclaim =          hammer_vop_reclaim,
 154         .vop_setattr =          hammer_vop_setattr,
 155         .vop_kqfilter =         hammer_vop_fifokqfilter
 156 };
 157
 158 static __inline
 159 void
 160 hammer_knote(struct vnode *vp, int flags)
 161 {
 162         if (flags)
 163                 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags);
 164 }
 165
 166 #ifdef DEBUG_TRUNCATE
 167 struct hammer_inode *HammerTruncIp;
 168 #endif
 169
 170 static int hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch,
 171                            struct vnode *dvp, struct ucred *cred,
 172                            int flags, int isdir);
 173 static int hammer_vop_strategy_read(struct vop_strategy_args *ap);
 174 static int hammer_vop_strategy_write(struct vop_strategy_args *ap);
 175
 176 #if 0
 177 static
 178 int
 179 hammer_vop_vnoperate(struct vop_generic_args *)
 180 {
 181         return (VOCALL(&hammer_vnode_vops, ap));
 182 }
 183 #endif
 184
 185 /*
 186  * hammer_vop_fsync { vp, waitfor }
 187  *
 188  * fsync() an inode to disk and wait for it to be completely committed
 189  * such that the information would not be undone if a crash occured after
 190  * return.
 191  *
 192  * NOTE: HAMMER's fsync()'s are going to remain expensive until we implement
 193  *       a REDO log.  A sysctl is provided to relax HAMMER's fsync()
 194  *       operation.
 195  *
 196  *       Ultimately the combination of a REDO log and use of fast storage
 197  *       to front-end cluster caches will make fsync fast, but it aint
 198  *       here yet.  And, in anycase, we need real transactional
 199  *       all-or-nothing features which are not restricted to a single file.
 200  */
 201 static
 202 int
 203 hammer_vop_fsync(struct vop_fsync_args *ap)
 204 {
 205         hammer_inode_t ip = VTOI(ap->a_vp);
 206         hammer_mount_t hmp = ip->hmp;
 207         int waitfor = ap->a_waitfor;
 208         int mode;
 209
 210         lwkt_gettoken(&hmp->fs_token);
 211
 212         /*
 213          * Fsync rule relaxation (default is either full synchronous flush
 214          * or REDO semantics with synchronous flush).
 215          */
 216         if (ap->a_flags & VOP_FSYNC_SYSCALL) {
 217                 switch(hammer_fsync_mode) {
 218                 case 0:
 219 mode0:
 220                         /* no REDO, full synchronous flush */
 221                         goto skip;
 222                 case 1:
 223 mode1:
 224                         /* no REDO, full asynchronous flush */
 225                         if (waitfor == MNT_WAIT)
 226                                 waitfor = MNT_NOWAIT;
 227                         goto skip;
 228                 case 2:
 229                         /* REDO semantics, synchronous flush */
 230                         if (hmp->version < HAMMER_VOL_VERSION_FOUR)
 231                                 goto mode0;
 232                         mode = HAMMER_FLUSH_UNDOS_AUTO;
 233                         break;
 234                 case 3:
 235                         /* REDO semantics, relaxed asynchronous flush */
 236                         if (hmp->version < HAMMER_VOL_VERSION_FOUR)
 237                                 goto mode1;
 238                         mode = HAMMER_FLUSH_UNDOS_RELAXED;
 239                         if (waitfor == MNT_WAIT)
 240                                 waitfor = MNT_NOWAIT;
 241                         break;
 242                 case 4:
 243                         /* ignore the fsync() system call */
 244                         lwkt_reltoken(&hmp->fs_token);
 245                         return(0);
 246                 default:
 247                         /* we have to do something */
 248                         mode = HAMMER_FLUSH_UNDOS_RELAXED;
 249                         if (waitfor == MNT_WAIT)
 250                                 waitfor = MNT_NOWAIT;
 251                         break;
 252                 }
 253
 254                 /*
 255                  * Fast fsync only needs to flush the UNDO/REDO fifo if
 256                  * HAMMER_INODE_REDO is non-zero and the only modifications
 257                  * made to the file are write or write-extends.
 258                  */
 259                 if ((ip->flags & HAMMER_INODE_REDO) &&
 260                     (ip->flags & HAMMER_INODE_MODMASK_NOREDO) == 0
 261                 ) {
 262                         ++hammer_count_fsyncs;
 263                         hammer_flusher_flush_undos(hmp, mode);
 264                         ip->redo_count = 0;
 265                         if (ip->vp && (ip->flags & HAMMER_INODE_MODMASK) == 0)
 266                                 vclrisdirty(ip->vp);
 267                         lwkt_reltoken(&hmp->fs_token);
 268                         return(0);
 269                 }
 270
 271                 /*
 272                  * REDO is enabled by fsync(), the idea being we really only
 273                  * want to lay down REDO records when programs are using
 274                  * fsync() heavily.  The first fsync() on the file starts
 275                  * the gravy train going and later fsync()s keep it hot by
 276                  * resetting the redo_count.
 277                  *
 278                  * We weren't running REDOs before now so we have to fall
 279                  * through and do a full fsync of what we have.
 280                  */
 281                 if (hmp->version >= HAMMER_VOL_VERSION_FOUR &&
 282                     (hmp->flags & HAMMER_MOUNT_REDO_RECOVERY_RUN) == 0) {
 283                         ip->flags |= HAMMER_INODE_REDO;
 284                         ip->redo_count = 0;
 285                 }
 286         }
 287 skip:
 288
 289         /*
 290          * Do a full flush sequence.
 291          *
 292          * Attempt to release the vnode while waiting for the inode to
 293          * finish flushing.  This can really mess up inactive->reclaim
 294          * sequences so only do it if the vnode is active.
 295          *
 296          * WARNING! The VX lock functions must be used.  vn_lock() will
 297          *          fail when this is part of a VOP_RECLAIM sequence.
 298          */
 299         ++hammer_count_fsyncs;
 300         vfsync(ap->a_vp, waitfor, 1, NULL, NULL);
 301         hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
 302         if (waitfor == MNT_WAIT) {
 303                 int dorelock;
 304
 305                 if ((ap->a_vp->v_flag & VRECLAIMED) == 0) {
 306                         vx_unlock(ap->a_vp);
 307                         dorelock = 1;
 308                 } else {
 309                         dorelock = 0;
 310                 }
 311                 hammer_wait_inode(ip);
 312                 if (dorelock)
 313                         vx_lock(ap->a_vp);
 314         }
 315         if (ip->vp && (ip->flags & HAMMER_INODE_MODMASK) == 0)
 316                 vclrisdirty(ip->vp);
 317         lwkt_reltoken(&hmp->fs_token);
 318         return (ip->error);
 319 }
 320
 321 /*
 322  * hammer_vop_read { vp, uio, ioflag, cred }
 323  *
 324  * MPSAFE (for the cache safe does not require fs_token)
 325  */
 326 static
 327 int
 328 hammer_vop_read(struct vop_read_args *ap)
 329 {
 330         struct hammer_transaction trans;
 331         hammer_inode_t ip;
 332         hammer_mount_t hmp;
 333         off_t offset;
 334         struct buf *bp;
 335         struct uio *uio;
 336         int error;
 337         int n;
 338         int seqcount;
 339         int ioseqcount;
 340         int blksize;
 341         int bigread;
 342         int got_trans;
 343         size_t resid;
 344
 345         if (ap->a_vp->v_type != VREG)
 346                 return (EINVAL);
 347         ip = VTOI(ap->a_vp);
 348         hmp = ip->hmp;
 349         error = 0;
 350         got_trans = 0;
 351         uio = ap->a_uio;
 352
 353         /*
 354          * Attempt to shortcut directly to the VM object using lwbufs.
 355          * This is much faster than instantiating buffer cache buffers.
 356          */
 357         resid = uio->uio_resid;
 358         error = vop_helper_read_shortcut(ap);
 359         hammer_stats_file_read += resid - uio->uio_resid;
 360         if (error)
 361                 return (error);
 362         if (uio->uio_resid == 0)
 363                 goto finished;
 364
 365         /*
 366          * Allow the UIO's size to override the sequential heuristic.
 367          */
 368         blksize = hammer_blocksize(uio->uio_offset);
 369         seqcount = (uio->uio_resid + (BKVASIZE - 1)) / BKVASIZE;
 370         ioseqcount = (ap->a_ioflag >> 16);
 371         if (seqcount < ioseqcount)
 372                 seqcount = ioseqcount;
 373
 374         /*
 375          * If reading or writing a huge amount of data we have to break
 376          * atomicy and allow the operation to be interrupted by a signal
 377          * or it can DOS the machine.
 378          */
 379         bigread = (uio->uio_resid > 100 * 1024 * 1024);
 380
 381         /*
 382          * Access the data typically in HAMMER_BUFSIZE blocks via the
 383          * buffer cache, but HAMMER may use a variable block size based
 384          * on the offset.
 385          *
 386          * XXX Temporary hack, delay the start transaction while we remain
 387          *     MPSAFE.  NOTE: ino_data.size cannot change while vnode is
 388          *     locked-shared.
 389          */
 390         while (uio->uio_resid > 0 && uio->uio_offset < ip->ino_data.size) {
 391                 int64_t base_offset;
 392                 int64_t file_limit;
 393
 394                 blksize = hammer_blocksize(uio->uio_offset);
 395                 offset = (int)uio->uio_offset & (blksize - 1);
 396                 base_offset = uio->uio_offset - offset;
 397
 398                 if (bigread && (error = hammer_signal_check(ip->hmp)) != 0)
 399                         break;
 400
 401                 /*
 402                  * MPSAFE
 403                  */
 404                 bp = getblk(ap->a_vp, base_offset, blksize, 0, 0);
 405                 if ((bp->b_flags & (B_INVAL | B_CACHE | B_RAM)) == B_CACHE) {
 406                         bp->b_flags &= ~B_AGE;
 407                         error = 0;
 408                         goto skip;
 409                 }
 410                 if (ap->a_ioflag & IO_NRDELAY) {
 411                         bqrelse(bp);
 412                         return (EWOULDBLOCK);
 413                 }
 414
 415                 /*
 416                  * MPUNSAFE
 417                  */
 418                 if (got_trans == 0) {
 419                         hammer_start_transaction(&trans, ip->hmp);
 420                         got_trans = 1;
 421                 }
 422
 423                 /*
 424                  * NOTE: A valid bp has already been acquired, but was not
 425                  *       B_CACHE.
 426                  */
 427                 if (hammer_cluster_enable) {
 428                         /*
 429                          * Use file_limit to prevent cluster_read() from
 430                          * creating buffers of the wrong block size past
 431                          * the demarc.
 432                          */
 433                         file_limit = ip->ino_data.size;
 434                         if (base_offset < HAMMER_XDEMARC &&
 435                             file_limit > HAMMER_XDEMARC) {
 436                                 file_limit = HAMMER_XDEMARC;
 437                         }
 438                         error = cluster_readx(ap->a_vp,
 439                                              file_limit, base_offset,
 440                                              blksize, uio->uio_resid,
 441                                              seqcount * BKVASIZE, &bp);
 442                 } else {
 443                         error = breadnx(ap->a_vp, base_offset, blksize,
 444                                         NULL, NULL, 0, &bp);
 445                 }
 446                 if (error) {
 447                         brelse(bp);
 448                         break;
 449                 }
 450 skip:
 451                 if ((hammer_debug_io & 0x0001) && (bp->b_flags & B_IODEBUG)) {
 452                         kprintf("doff %016jx read file %016jx@%016jx\n",
 453                                 (intmax_t)bp->b_bio2.bio_offset,
 454                                 (intmax_t)ip->obj_id,
 455                                 (intmax_t)bp->b_loffset);
 456                 }
 457                 bp->b_flags &= ~B_IODEBUG;
 458                 if (blksize == HAMMER_XBUFSIZE)
 459                         bp->b_flags |= B_CLUSTEROK;
 460
 461                 n = blksize - offset;
 462                 if (n > uio->uio_resid)
 463                         n = uio->uio_resid;
 464                 if (n > ip->ino_data.size - uio->uio_offset)
 465                         n = (int)(ip->ino_data.size - uio->uio_offset);
 466
 467                 /*
 468                  * Set B_AGE, data has a lower priority than meta-data.
 469                  *
 470                  * Use a hold/unlock/drop sequence to run the uiomove
 471                  * with the buffer unlocked, avoiding deadlocks against
 472                  * read()s on mmap()'d spaces.
 473                  */
 474                 bp->b_flags |= B_AGE;
 475                 error = uiomovebp(bp, (char *)bp->b_data + offset, n, uio);
 476                 bqrelse(bp);
 477
 478                 if (error)
 479                         break;
 480                 hammer_stats_file_read += n;
 481         }
 482
 483 finished:
 484
 485         /*
 486          * Try to update the atime with just the inode lock for maximum
 487          * concurrency.  If we can't shortcut it we have to get the full
 488          * blown transaction.
 489          */
 490         if (got_trans == 0 && hammer_update_atime_quick(ip) < 0) {
 491                 hammer_start_transaction(&trans, ip->hmp);
 492                 got_trans = 1;
 493         }
 494
 495         if (got_trans) {
 496                 if ((ip->flags & HAMMER_INODE_RO) == 0 &&
 497                     (ip->hmp->mp->mnt_flag & MNT_NOATIME) == 0) {
 498                         lwkt_gettoken(&hmp->fs_token);
 499                         ip->ino_data.atime = trans.time;
 500                         hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME);
 501                         hammer_done_transaction(&trans);
 502                         lwkt_reltoken(&hmp->fs_token);
 503                 } else {
 504                         hammer_done_transaction(&trans);
 505                 }
 506         }
 507         return (error);
 508 }
 509
 510 /*
 511  * hammer_vop_write { vp, uio, ioflag, cred }
 512  */
 513 static
 514 int
 515 hammer_vop_write(struct vop_write_args *ap)
 516 {
 517         struct hammer_transaction trans;
 518         struct hammer_inode *ip;
 519         hammer_mount_t hmp;
 520         thread_t td;
 521         struct uio *uio;
 522         int offset;
 523         off_t base_offset;
 524         int64_t cluster_eof;
 525         struct buf *bp;
 526         int kflags;
 527         int error;
 528         int n;
 529         int flags;
 530         int seqcount;
 531         int bigwrite;
 532
 533         if (ap->a_vp->v_type != VREG)
 534                 return (EINVAL);
 535         ip = VTOI(ap->a_vp);
 536         hmp = ip->hmp;
 537         error = 0;
 538         kflags = 0;
 539         seqcount = ap->a_ioflag >> 16;
 540
 541         if (ip->flags & HAMMER_INODE_RO)
 542                 return (EROFS);
 543
 544         /*
 545          * Create a transaction to cover the operations we perform.
 546          */
 547         hammer_start_transaction(&trans, hmp);
 548         uio = ap->a_uio;
 549
 550         /*
 551          * Check append mode
 552          */
 553         if (ap->a_ioflag & IO_APPEND)
 554                 uio->uio_offset = ip->ino_data.size;
 555
 556         /*
 557          * Check for illegal write offsets.  Valid range is 0...2^63-1.
 558          *
 559          * NOTE: the base_off assignment is required to work around what
 560          * I consider to be a GCC-4 optimization bug.
 561          */
 562         if (uio->uio_offset < 0) {
 563                 hammer_done_transaction(&trans);
 564                 return (EFBIG);
 565         }
 566         base_offset = uio->uio_offset + uio->uio_resid; /* work around gcc-4 */
 567         if (uio->uio_resid > 0 && base_offset <= uio->uio_offset) {
 568                 hammer_done_transaction(&trans);
 569                 return (EFBIG);
 570         }
 571
 572         if (uio->uio_resid > 0 && (td = uio->uio_td) != NULL && td->td_proc &&
 573             base_offset > td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
 574                 hammer_done_transaction(&trans);
 575                 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ);
 576                 return (EFBIG);
 577         }
 578
 579         /*
 580          * If reading or writing a huge amount of data we have to break
 581          * atomicy and allow the operation to be interrupted by a signal
 582          * or it can DOS the machine.
 583          *
 584          * Preset redo_count so we stop generating REDOs earlier if the
 585          * limit is exceeded.
 586          *
 587          * redo_count is heuristical, SMP races are ok
 588          */
 589         bigwrite = (uio->uio_resid > 100 * 1024 * 1024);
 590         if ((ip->flags & HAMMER_INODE_REDO) &&
 591             ip->redo_count < hammer_limit_redo) {
 592                 ip->redo_count += uio->uio_resid;
 593         }
 594
 595         /*
 596          * Access the data typically in HAMMER_BUFSIZE blocks via the
 597          * buffer cache, but HAMMER may use a variable block size based
 598          * on the offset.
 599          */
 600         while (uio->uio_resid > 0) {
 601                 int fixsize = 0;
 602                 int blksize;
 603                 int blkmask;
 604                 int trivial;
 605                 int endofblk;
 606                 off_t nsize;
 607
 608                 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE)) != 0)
 609                         break;
 610                 if (bigwrite && (error = hammer_signal_check(hmp)) != 0)
 611                         break;
 612
 613                 blksize = hammer_blocksize(uio->uio_offset);
 614
 615                 /*
 616                  * Control the number of pending records associated with
 617                  * this inode.  If too many have accumulated start a
 618                  * flush.  Try to maintain a pipeline with the flusher.
 619                  *
 620                  * NOTE: It is possible for other sources to grow the
 621                  *       records but not necessarily issue another flush,
 622                  *       so use a timeout and ensure that a re-flush occurs.
 623                  */
 624                 if (ip->rsv_recs >= hammer_limit_inode_recs) {
 625                         lwkt_gettoken(&hmp->fs_token);
 626                         hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
 627                         while (ip->rsv_recs >= hammer_limit_inode_recs * 2) {
 628                                 ip->flags |= HAMMER_INODE_RECSW;
 629                                 tsleep(&ip->rsv_recs, 0, "hmrwww", hz);
 630                                 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
 631                         }
 632                         lwkt_reltoken(&hmp->fs_token);
 633                 }
 634
 635                 /*
 636                  * Do not allow HAMMER to blow out the buffer cache.  Very
 637                  * large UIOs can lockout other processes due to bwillwrite()
 638                  * mechanics.
 639                  *
 640                  * The hammer inode is not locked during these operations.
 641                  * The vnode is locked which can interfere with the pageout
 642                  * daemon for non-UIO_NOCOPY writes but should not interfere
 643                  * with the buffer cache.  Even so, we cannot afford to
 644                  * allow the pageout daemon to build up too many dirty buffer
 645                  * cache buffers.
 646                  *
 647                  * Only call this if we aren't being recursively called from
 648                  * a virtual disk device (vn), else we may deadlock.
 649                  */
 650                 if ((ap->a_ioflag & IO_RECURSE) == 0)
 651                         bwillwrite(blksize);
 652
 653                 /*
 654                  * Calculate the blocksize at the current offset and figure
 655                  * out how much we can actually write.
 656                  */
 657                 blkmask = blksize - 1;
 658                 offset = (int)uio->uio_offset & blkmask;
 659                 base_offset = uio->uio_offset & ~(int64_t)blkmask;
 660                 n = blksize - offset;
 661                 if (n > uio->uio_resid) {
 662                         n = uio->uio_resid;
 663                         endofblk = 0;
 664                 } else {
 665                         endofblk = 1;
 666                 }
 667                 nsize = uio->uio_offset + n;
 668                 if (nsize > ip->ino_data.size) {
 669                         if (uio->uio_offset > ip->ino_data.size)
 670                                 trivial = 0;
 671                         else
 672                                 trivial = 1;
 673                         nvextendbuf(ap->a_vp,
 674                                     ip->ino_data.size,
 675                                     nsize,
 676                                     hammer_blocksize(ip->ino_data.size),
 677                                     hammer_blocksize(nsize),
 678                                     hammer_blockoff(ip->ino_data.size),
 679                                     hammer_blockoff(nsize),
 680                                     trivial);
 681                         fixsize = 1;
 682                         kflags |= NOTE_EXTEND;
 683                 }
 684
 685                 if (uio->uio_segflg == UIO_NOCOPY) {
 686                         /*
 687                          * Issuing a write with the same data backing the
 688                          * buffer.  Instantiate the buffer to collect the
 689                          * backing vm pages, then read-in any missing bits.
 690                          *
 691                          * This case is used by vop_stdputpages().
 692                          */
 693                         bp = getblk(ap->a_vp, base_offset,
 694                                     blksize, GETBLK_BHEAVY, 0);
 695                         if ((bp->b_flags & B_CACHE) == 0) {
 696                                 bqrelse(bp);
 697                                 error = bread(ap->a_vp, base_offset,
 698                                               blksize, &bp);
 699                         }
 700                 } else if (offset == 0 && uio->uio_resid >= blksize) {
 701                         /*
 702                          * Even though we are entirely overwriting the buffer
 703                          * we may still have to zero it out to avoid a
 704                          * mmap/write visibility issue.
 705                          */
 706                         bp = getblk(ap->a_vp, base_offset, blksize, GETBLK_BHEAVY, 0);
 707                         if ((bp->b_flags & B_CACHE) == 0)
 708                                 vfs_bio_clrbuf(bp);
 709                 } else if (base_offset >= ip->ino_data.size) {
 710                         /*
 711                          * If the base offset of the buffer is beyond the
 712                          * file EOF, we don't have to issue a read.
 713                          */
 714                         bp = getblk(ap->a_vp, base_offset,
 715                                     blksize, GETBLK_BHEAVY, 0);
 716                         vfs_bio_clrbuf(bp);
 717                 } else {
 718                         /*
 719                          * Partial overwrite, read in any missing bits then
 720                          * replace the portion being written.
 721                          */
 722                         error = bread(ap->a_vp, base_offset, blksize, &bp);
 723                         if (error == 0)
 724                                 bheavy(bp);
 725                 }
 726                 if (error == 0)
 727                         error = uiomovebp(bp, bp->b_data + offset, n, uio);
 728
 729                 lwkt_gettoken(&hmp->fs_token);
 730
 731                 /*
 732                  * Generate REDO records if enabled and redo_count will not
 733                  * exceeded the limit.
 734                  *
 735                  * If redo_count exceeds the limit we stop generating records
 736                  * and clear HAMMER_INODE_REDO.  This will cause the next
 737                  * fsync() to do a full meta-data sync instead of just an
 738                  * UNDO/REDO fifo update.
 739                  *
 740                  * When clearing HAMMER_INODE_REDO any pre-existing REDOs
 741                  * will still be tracked.  The tracks will be terminated
 742                  * when the related meta-data (including possible data
 743                  * modifications which are not tracked via REDO) is
 744                  * flushed.
 745                  */
 746                 if ((ip->flags & HAMMER_INODE_REDO) && error == 0) {
 747                         if (ip->redo_count < hammer_limit_redo) {
 748                                 bp->b_flags |= B_VFSFLAG1;
 749                                 error = hammer_generate_redo(&trans, ip,
 750                                                      base_offset + offset,
 751                                                      HAMMER_REDO_WRITE,
 752                                                      bp->b_data + offset,
 753                                                      (size_t)n);
 754                         } else {
 755                                 ip->flags &= ~HAMMER_INODE_REDO;
 756                         }
 757                 }
 758
 759                 /*
 760                  * If we screwed up we have to undo any VM size changes we
 761                  * made.
 762                  */
 763                 if (error) {
 764                         brelse(bp);
 765                         if (fixsize) {
 766                                 nvtruncbuf(ap->a_vp, ip->ino_data.size,
 767                                           hammer_blocksize(ip->ino_data.size),
 768                                           hammer_blockoff(ip->ino_data.size),
 769                                           0);
 770                         }
 771                         lwkt_reltoken(&hmp->fs_token);
 772                         break;
 773                 }
 774                 kflags |= NOTE_WRITE;
 775                 hammer_stats_file_write += n;
 776                 if (blksize == HAMMER_XBUFSIZE)
 777                         bp->b_flags |= B_CLUSTEROK;
 778                 if (ip->ino_data.size < uio->uio_offset) {
 779                         ip->ino_data.size = uio->uio_offset;
 780                         flags = HAMMER_INODE_SDIRTY;
 781                 } else {
 782                         flags = 0;
 783                 }
 784                 ip->ino_data.mtime = trans.time;
 785                 flags |= HAMMER_INODE_MTIME | HAMMER_INODE_BUFS;
 786                 hammer_modify_inode(&trans, ip, flags);
 787
 788                 /*
 789                  * Once we dirty the buffer any cached zone-X offset
 790                  * becomes invalid.  HAMMER NOTE: no-history mode cannot
 791                  * allow overwriting over the same data sector unless
 792                  * we provide UNDOs for the old data, which we don't.
 793                  */
 794                 bp->b_bio2.bio_offset = NOOFFSET;
 795
 796                 lwkt_reltoken(&hmp->fs_token);
 797
 798                 /*
 799                  * Final buffer disposition.
 800                  *
 801                  * Because meta-data updates are deferred, HAMMER is
 802                  * especially sensitive to excessive bdwrite()s because
 803                  * the I/O stream is not broken up by disk reads.  So the
 804                  * buffer cache simply cannot keep up.
 805                  *
 806                  * WARNING!  blksize is variable.  cluster_write() is
 807                  *           expected to not blow up if it encounters
 808                  *           buffers that do not match the passed blksize.
 809                  *
 810                  * NOTE!  Hammer shouldn't need to bawrite()/cluster_write().
 811                  *        The ip->rsv_recs check should burst-flush the data.
 812                  *        If we queue it immediately the buf could be left
 813                  *        locked on the device queue for a very long time.
 814                  *
 815                  *        However, failing to flush a dirty buffer out when
 816                  *        issued from the pageout daemon can result in a low
 817                  *        memory deadlock against bio_page_alloc(), so we
 818                  *        have to bawrite() on IO_ASYNC as well.
 819                  *
 820                  * NOTE!  To avoid degenerate stalls due to mismatched block
 821                  *        sizes we only honor IO_DIRECT on the write which
 822                  *        abuts the end of the buffer.  However, we must
 823                  *        honor IO_SYNC in case someone is silly enough to
 824                  *        configure a HAMMER file as swap, or when HAMMER
 825                  *        is serving NFS (for commits).  Ick ick.
 826                  */
 827                 bp->b_flags |= B_AGE;
 828                 if (blksize == HAMMER_XBUFSIZE)
 829                         bp->b_flags |= B_CLUSTEROK;
 830
 831                 if (ap->a_ioflag & IO_SYNC) {
 832                         bwrite(bp);
 833                 } else if ((ap->a_ioflag & IO_DIRECT) && endofblk) {
 834                         bawrite(bp);
 835                 } else if (ap->a_ioflag & IO_ASYNC) {
 836                         bawrite(bp);
 837                 } else if (hammer_cluster_enable &&
 838                            !(ap->a_vp->v_mount->mnt_flag & MNT_NOCLUSTERW)) {
 839                         if (base_offset < HAMMER_XDEMARC)
 840                                 cluster_eof = hammer_blockdemarc(base_offset,
 841                                                          ip->ino_data.size);
 842                         else
 843                                 cluster_eof = ip->ino_data.size;
 844                         cluster_write(bp, cluster_eof, blksize, seqcount);
 845                 } else {
 846                         bdwrite(bp);
 847                 }
 848         }
 849         hammer_done_transaction(&trans);
 850         hammer_knote(ap->a_vp, kflags);
 851
 852         return (error);
 853 }
 854
 855 /*
 856  * hammer_vop_access { vp, mode, cred }
 857  *
 858  * MPSAFE - does not require fs_token
 859  */
 860 static
 861 int
 862 hammer_vop_access(struct vop_access_args *ap)
 863 {
 864         struct hammer_inode *ip = VTOI(ap->a_vp);
 865         uid_t uid;
 866         gid_t gid;
 867         int error;
 868
 869         ++hammer_stats_file_iopsr;
 870         uid = hammer_to_unix_xid(&ip->ino_data.uid);
 871         gid = hammer_to_unix_xid(&ip->ino_data.gid);
 872
 873         error = vop_helper_access(ap, uid, gid, ip->ino_data.mode,
 874                                   ip->ino_data.uflags);
 875         return (error);
 876 }
 877
 878 /*
 879  * hammer_vop_advlock { vp, id, op, fl, flags }
 880  *
 881  * MPSAFE - does not require fs_token
 882  */
 883 static
 884 int
 885 hammer_vop_advlock(struct vop_advlock_args *ap)
 886 {
 887         hammer_inode_t ip = VTOI(ap->a_vp);
 888
 889         return (lf_advlock(ap, &ip->advlock, ip->ino_data.size));
 890 }
 891
 892 /*
 893  * hammer_vop_close { vp, fflag }
 894  *
 895  * We can only sync-on-close for normal closes.  XXX disabled for now.
 896  */
 897 static
 898 int
 899 hammer_vop_close(struct vop_close_args *ap)
 900 {
 901 #if 0
 902         struct vnode *vp = ap->a_vp;
 903         hammer_inode_t ip = VTOI(vp);
 904         int waitfor;
 905         if (ip->flags & (HAMMER_INODE_CLOSESYNC|HAMMER_INODE_CLOSEASYNC)) {
 906                 if (vn_islocked(vp) == LK_EXCLUSIVE &&
 907                     (vp->v_flag & (VINACTIVE|VRECLAIMED)) == 0) {
 908                         if (ip->flags & HAMMER_INODE_CLOSESYNC)
 909                                 waitfor = MNT_WAIT;
 910                         else
 911                                 waitfor = MNT_NOWAIT;
 912                         ip->flags &= ~(HAMMER_INODE_CLOSESYNC |
 913                                        HAMMER_INODE_CLOSEASYNC);
 914                         VOP_FSYNC(vp, MNT_NOWAIT, waitfor);
 915                 }
 916         }
 917 #endif
 918         return (vop_stdclose(ap));
 919 }
 920
 921 /*
 922  * hammer_vop_ncreate { nch, dvp, vpp, cred, vap }
 923  *
 924  * The operating system has already ensured that the directory entry
 925  * does not exist and done all appropriate namespace locking.
 926  */
 927 static
 928 int
 929 hammer_vop_ncreate(struct vop_ncreate_args *ap)
 930 {
 931         struct hammer_transaction trans;
 932         struct hammer_inode *dip;
 933         struct hammer_inode *nip;
 934         struct nchandle *nch;
 935         hammer_mount_t hmp;
 936         int error;
 937
 938         nch = ap->a_nch;
 939         dip = VTOI(ap->a_dvp);
 940         hmp = dip->hmp;
 941
 942         if (dip->flags & HAMMER_INODE_RO)
 943                 return (EROFS);
 944         if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
 945                 return (error);
 946
 947         /*
 948          * Create a transaction to cover the operations we perform.
 949          */
 950         lwkt_gettoken(&hmp->fs_token);
 951         hammer_start_transaction(&trans, hmp);
 952         ++hammer_stats_file_iopsw;
 953
 954         /*
 955          * Create a new filesystem object of the requested type.  The
 956          * returned inode will be referenced and shared-locked to prevent
 957          * it from being moved to the flusher.
 958          */
 959         error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
 960                                     dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
 961                                     NULL, &nip);
 962         if (error) {
 963                 hkprintf("hammer_create_inode error %d\n", error);
 964                 hammer_done_transaction(&trans);
 965                 *ap->a_vpp = NULL;
 966                 lwkt_reltoken(&hmp->fs_token);
 967                 return (error);
 968         }
 969
 970         /*
 971          * Add the new filesystem object to the directory.  This will also
 972          * bump the inode's link count.
 973          */
 974         error = hammer_ip_add_directory(&trans, dip,
 975                                         nch->ncp->nc_name, nch->ncp->nc_nlen,
 976                                         nip);
 977         if (error)
 978                 hkprintf("hammer_ip_add_directory error %d\n", error);
 979
 980         /*
 981          * Finish up.
 982          */
 983         if (error) {
 984                 hammer_rel_inode(nip, 0);
 985                 hammer_done_transaction(&trans);
 986                 *ap->a_vpp = NULL;
 987         } else {
 988                 error = hammer_get_vnode(nip, ap->a_vpp);
 989                 hammer_done_transaction(&trans);
 990                 hammer_rel_inode(nip, 0);
 991                 if (error == 0) {
 992                         cache_setunresolved(ap->a_nch);
 993                         cache_setvp(ap->a_nch, *ap->a_vpp);
 994                 }
 995                 hammer_knote(ap->a_dvp, NOTE_WRITE);
 996         }
 997         lwkt_reltoken(&hmp->fs_token);
 998         return (error);
 999 }
1000
1001 /*
1002  * hammer_vop_getattr { vp, vap }
1003  *
1004  * Retrieve an inode's attribute information.  When accessing inodes
1005  * historically we fake the atime field to ensure consistent results.
1006  * The atime field is stored in the B-Tree element and allowed to be
1007  * updated without cycling the element.
1008  *
1009  * MPSAFE - does not require fs_token
1010  */
1011 static
1012 int
1013 hammer_vop_getattr(struct vop_getattr_args *ap)
1014 {
1015         struct hammer_inode *ip = VTOI(ap->a_vp);
1016         struct vattr *vap = ap->a_vap;
1017
1018         /*
1019          * We want the fsid to be different when accessing a filesystem
1020          * with different as-of's so programs like diff don't think
1021          * the files are the same.
1022          *
1023          * We also want the fsid to be the same when comparing snapshots,
1024          * or when comparing mirrors (which might be backed by different
1025          * physical devices).  HAMMER fsids are based on the PFS's
1026          * shared_uuid field.
1027          *
1028          * XXX there is a chance of collision here.  The va_fsid reported
1029          * by stat is different from the more involved fsid used in the
1030          * mount structure.
1031          */
1032         ++hammer_stats_file_iopsr;
1033         hammer_lock_sh(&ip->lock);
1034         vap->va_fsid = ip->pfsm->fsid_udev ^ (u_int32_t)ip->obj_asof ^
1035                        (u_int32_t)(ip->obj_asof >> 32);
1036
1037         vap->va_fileid = ip->ino_leaf.base.obj_id;
1038         vap->va_mode = ip->ino_data.mode;
1039         vap->va_nlink = ip->ino_data.nlinks;
1040         vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid);
1041         vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid);
1042         vap->va_rmajor = 0;
1043         vap->va_rminor = 0;
1044         vap->va_size = ip->ino_data.size;
1045
1046         /*
1047          * Special case for @@PFS softlinks.  The actual size of the
1048          * expanded softlink is "@@0x%016llx:%05d" == 26 bytes.
1049          * or for MAX_TID is    "@@-1:%05d" == 10 bytes.
1050          */
1051         if (ip->ino_data.obj_type == HAMMER_OBJTYPE_SOFTLINK &&
1052             ip->ino_data.size == 10 &&
1053             ip->obj_asof == HAMMER_MAX_TID &&
1054             ip->obj_localization == 0 &&
1055             strncmp(ip->ino_data.ext.symlink, "@@PFS", 5) == 0) {
1056                     if (ip->pfsm->pfsd.mirror_flags & HAMMER_PFSD_SLAVE)
1057                             vap->va_size = 26;
1058                     else
1059                             vap->va_size = 10;
1060         }
1061
1062         /*
1063          * We must provide a consistent atime and mtime for snapshots
1064          * so people can do a 'tar cf - ... | md5' on them and get
1065          * consistent results.
1066          */
1067         if (ip->flags & HAMMER_INODE_RO) {
1068                 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_atime);
1069                 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_mtime);
1070         } else {
1071                 hammer_time_to_timespec(ip->ino_data.atime, &vap->va_atime);
1072                 hammer_time_to_timespec(ip->ino_data.mtime, &vap->va_mtime);
1073         }
1074         hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_ctime);
1075         vap->va_flags = ip->ino_data.uflags;
1076         vap->va_gen = 1;        /* hammer inums are unique for all time */
1077         vap->va_blocksize = HAMMER_BUFSIZE;
1078         if (ip->ino_data.size >= HAMMER_XDEMARC) {
1079                 vap->va_bytes = (ip->ino_data.size + HAMMER_XBUFMASK64) &
1080                                 ~HAMMER_XBUFMASK64;
1081         } else if (ip->ino_data.size > HAMMER_BUFSIZE / 2) {
1082                 vap->va_bytes = (ip->ino_data.size + HAMMER_BUFMASK64) &
1083                                 ~HAMMER_BUFMASK64;
1084         } else {
1085                 vap->va_bytes = (ip->ino_data.size + 15) & ~15;
1086         }
1087
1088         vap->va_type = hammer_get_vnode_type(ip->ino_data.obj_type);
1089         vap->va_filerev = 0;    /* XXX */
1090         vap->va_uid_uuid = ip->ino_data.uid;
1091         vap->va_gid_uuid = ip->ino_data.gid;
1092         vap->va_fsid_uuid = ip->hmp->fsid;
1093         vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID |
1094                           VA_FSID_UUID_VALID;
1095
1096         switch (ip->ino_data.obj_type) {
1097         case HAMMER_OBJTYPE_CDEV:
1098         case HAMMER_OBJTYPE_BDEV:
1099                 vap->va_rmajor = ip->ino_data.rmajor;
1100                 vap->va_rminor = ip->ino_data.rminor;
1101                 break;
1102         default:
1103                 break;
1104         }
1105         hammer_unlock(&ip->lock);
1106         return(0);
1107 }
1108
1109 /*
1110  * hammer_vop_nresolve { nch, dvp, cred }
1111  *
1112  * Locate the requested directory entry.
1113  */
1114 static
1115 int
1116 hammer_vop_nresolve(struct vop_nresolve_args *ap)
1117 {
1118         struct hammer_transaction trans;
1119         struct namecache *ncp;
1120         hammer_mount_t hmp;
1121         hammer_inode_t dip;
1122         hammer_inode_t ip;
1123         hammer_tid_t asof;
1124         struct hammer_cursor cursor;
1125         struct vnode *vp;
1126         int64_t namekey;
1127         int error;
1128         int i;
1129         int nlen;
1130         int flags;
1131         int ispfs;
1132         int64_t obj_id;
1133         u_int32_t localization;
1134         u_int32_t max_iterations;
1135
1136         /*
1137          * Misc initialization, plus handle as-of name extensions.  Look for
1138          * the '@@' extension.  Note that as-of files and directories cannot
1139          * be modified.
1140          */
1141         dip = VTOI(ap->a_dvp);
1142         ncp = ap->a_nch->ncp;
1143         asof = dip->obj_asof;
1144         localization = dip->obj_localization;   /* for code consistency */
1145         nlen = ncp->nc_nlen;
1146         flags = dip->flags & HAMMER_INODE_RO;
1147         ispfs = 0;
1148         hmp = dip->hmp;
1149
1150         lwkt_gettoken(&hmp->fs_token);
1151         hammer_simple_transaction(&trans, hmp);
1152         ++hammer_stats_file_iopsr;
1153
1154         for (i = 0; i < nlen; ++i) {
1155                 if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') {
1156                         error = hammer_str_to_tid(ncp->nc_name + i + 2,
1157                                                   &ispfs, &asof, &localization);
1158                         if (error != 0) {
1159                                 i = nlen;
1160                                 break;
1161                         }
1162                         if (asof != HAMMER_MAX_TID)
1163                                 flags |= HAMMER_INODE_RO;
1164                         break;
1165                 }
1166         }
1167         nlen = i;
1168
1169         /*
1170          * If this is a PFS softlink we dive into the PFS
1171          */
1172         if (ispfs && nlen == 0) {
1173                 ip = hammer_get_inode(&trans, dip, HAMMER_OBJID_ROOT,
1174                                       asof, localization,
1175                                       flags, &error);
1176                 if (error == 0) {
1177                         error = hammer_get_vnode(ip, &vp);
1178                         hammer_rel_inode(ip, 0);
1179                 } else {
1180                         vp = NULL;
1181                 }
1182                 if (error == 0) {
1183                         vn_unlock(vp);
1184                         cache_setvp(ap->a_nch, vp);
1185                         vrele(vp);
1186                 }
1187                 goto done;
1188         }
1189
1190         /*
1191          * If there is no path component the time extension is relative to dip.
1192          * e.g. "fubar/@@<snapshot>"
1193          *
1194          * "." is handled by the kernel, but ".@@<snapshot>" is not.
1195          * e.g. "fubar/.@@<snapshot>"
1196          *
1197          * ".." is handled by the kernel.  We do not currently handle
1198          * "..@<snapshot>".
1199          */
1200         if (nlen == 0 || (nlen == 1 && ncp->nc_name[0] == '.')) {
1201                 ip = hammer_get_inode(&trans, dip, dip->obj_id,
1202                                       asof, dip->obj_localization,
1203                                       flags, &error);
1204                 if (error == 0) {
1205                         error = hammer_get_vnode(ip, &vp);
1206                         hammer_rel_inode(ip, 0);
1207                 } else {
1208                         vp = NULL;
1209                 }
1210                 if (error == 0) {
1211                         vn_unlock(vp);
1212                         cache_setvp(ap->a_nch, vp);
1213                         vrele(vp);
1214                 }
1215                 goto done;
1216         }
1217
1218         /*
1219          * Calculate the namekey and setup the key range for the scan.  This
1220          * works kinda like a chained hash table where the lower 32 bits
1221          * of the namekey synthesize the chain.
1222          *
1223          * The key range is inclusive of both key_beg and key_end.
1224          */
1225         namekey = hammer_directory_namekey(dip, ncp->nc_name, nlen,
1226                                            &max_iterations);
1227
1228         error = hammer_init_cursor(&trans, &cursor, &dip->cache[1], dip);
1229         cursor.key_beg.localization = dip->obj_localization +
1230                                       hammer_dir_localization(dip);
1231         cursor.key_beg.obj_id = dip->obj_id;
1232         cursor.key_beg.key = namekey;
1233         cursor.key_beg.create_tid = 0;
1234         cursor.key_beg.delete_tid = 0;
1235         cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1236         cursor.key_beg.obj_type = 0;
1237
1238         cursor.key_end = cursor.key_beg;
1239         cursor.key_end.key += max_iterations;
1240         cursor.asof = asof;
1241         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1242
1243         /*
1244          * Scan all matching records (the chain), locate the one matching
1245          * the requested path component.
1246          *
1247          * The hammer_ip_*() functions merge in-memory records with on-disk
1248          * records for the purposes of the search.
1249          */
1250         obj_id = 0;
1251         localization = HAMMER_DEF_LOCALIZATION;
1252
1253         if (error == 0) {
1254                 error = hammer_ip_first(&cursor);
1255                 while (error == 0) {
1256                         error = hammer_ip_resolve_data(&cursor);
1257                         if (error)
1258                                 break;
1259                         if (nlen == cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF &&
1260                             bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
1261                                 obj_id = cursor.data->entry.obj_id;
1262                                 localization = cursor.data->entry.localization;
1263                                 break;
1264                         }
1265                         error = hammer_ip_next(&cursor);
1266                 }
1267         }
1268         hammer_done_cursor(&cursor);
1269
1270         /*
1271          * Lookup the obj_id.  This should always succeed.  If it does not
1272          * the filesystem may be damaged and we return a dummy inode.
1273          */
1274         if (error == 0) {
1275                 ip = hammer_get_inode(&trans, dip, obj_id,
1276                                       asof, localization,
1277                                       flags, &error);
1278                 if (error == ENOENT) {
1279                         kprintf("HAMMER: WARNING: Missing "
1280                                 "inode for dirent \"%s\"\n"
1281                                 "\tobj_id = %016llx, asof=%016llx, lo=%08x\n",
1282                                 ncp->nc_name,
1283                                 (long long)obj_id, (long long)asof,
1284                                 localization);
1285                         error = 0;
1286                         ip = hammer_get_dummy_inode(&trans, dip, obj_id,
1287                                                     asof, localization,
1288                                                     flags, &error);
1289                 }
1290                 if (error == 0) {
1291                         error = hammer_get_vnode(ip, &vp);
1292                         hammer_rel_inode(ip, 0);
1293                 } else {
1294                         vp = NULL;
1295                 }
1296                 if (error == 0) {
1297                         vn_unlock(vp);
1298                         cache_setvp(ap->a_nch, vp);
1299                         vrele(vp);
1300                 }
1301         } else if (error == ENOENT) {
1302                 cache_setvp(ap->a_nch, NULL);
1303         }
1304 done:
1305         hammer_done_transaction(&trans);
1306         lwkt_reltoken(&hmp->fs_token);
1307         return (error);
1308 }
1309
1310 /*
1311  * hammer_vop_nlookupdotdot { dvp, vpp, cred }
1312  *
1313  * Locate the parent directory of a directory vnode.
1314  *
1315  * dvp is referenced but not locked.  *vpp must be returned referenced and
1316  * locked.  A parent_obj_id of 0 does not necessarily indicate that we are
1317  * at the root, instead it could indicate that the directory we were in was
1318  * removed.
1319  *
1320  * NOTE: as-of sequences are not linked into the directory structure.  If
1321  * we are at the root with a different asof then the mount point, reload
1322  * the same directory with the mount point's asof.   I'm not sure what this
1323  * will do to NFS.  We encode ASOF stamps in NFS file handles so it might not
1324  * get confused, but it hasn't been tested.
1325  */
1326 static
1327 int
1328 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
1329 {
1330         struct hammer_transaction trans;
1331         struct hammer_inode *dip;
1332         struct hammer_inode *ip;
1333         hammer_mount_t hmp;
1334         int64_t parent_obj_id;
1335         u_int32_t parent_obj_localization;
1336         hammer_tid_t asof;
1337         int error;
1338
1339         dip = VTOI(ap->a_dvp);
1340         asof = dip->obj_asof;
1341         hmp = dip->hmp;
1342
1343         /*
1344          * Whos are parent?  This could be the root of a pseudo-filesystem
1345          * whos parent is in another localization domain.
1346          */
1347         lwkt_gettoken(&hmp->fs_token);
1348         parent_obj_id = dip->ino_data.parent_obj_id;
1349         if (dip->obj_id == HAMMER_OBJID_ROOT)
1350                 parent_obj_localization = dip->ino_data.ext.obj.parent_obj_localization;
1351         else
1352                 parent_obj_localization = dip->obj_localization;
1353
1354         if (parent_obj_id == 0) {
1355                 if (dip->obj_id == HAMMER_OBJID_ROOT &&
1356                    asof != hmp->asof) {
1357                         parent_obj_id = dip->obj_id;
1358                         asof = hmp->asof;
1359                         *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK);
1360                         ksnprintf(*ap->a_fakename, 19, "0x%016llx",
1361                                   (long long)dip->obj_asof);
1362                 } else {
1363                         *ap->a_vpp = NULL;
1364                         lwkt_reltoken(&hmp->fs_token);
1365                         return ENOENT;
1366                 }
1367         }
1368
1369         hammer_simple_transaction(&trans, hmp);
1370         ++hammer_stats_file_iopsr;
1371
1372         ip = hammer_get_inode(&trans, dip, parent_obj_id,
1373                               asof, parent_obj_localization,
1374                               dip->flags, &error);
1375         if (ip) {
1376                 error = hammer_get_vnode(ip, ap->a_vpp);
1377                 hammer_rel_inode(ip, 0);
1378         } else {
1379                 *ap->a_vpp = NULL;
1380         }
1381         hammer_done_transaction(&trans);
1382         lwkt_reltoken(&hmp->fs_token);
1383         return (error);
1384 }
1385
1386 /*
1387  * hammer_vop_nlink { nch, dvp, vp, cred }
1388  */
1389 static
1390 int
1391 hammer_vop_nlink(struct vop_nlink_args *ap)
1392 {
1393         struct hammer_transaction trans;
1394         struct hammer_inode *dip;
1395         struct hammer_inode *ip;
1396         struct nchandle *nch;
1397         hammer_mount_t hmp;
1398         int error;
1399
1400         if (ap->a_dvp->v_mount != ap->a_vp->v_mount)
1401                 return(EXDEV);
1402
1403         nch = ap->a_nch;
1404         dip = VTOI(ap->a_dvp);
1405         ip = VTOI(ap->a_vp);
1406         hmp = dip->hmp;
1407
1408         if (dip->obj_localization != ip->obj_localization)
1409                 return(EXDEV);
1410
1411         if (dip->flags & HAMMER_INODE_RO)
1412                 return (EROFS);
1413         if (ip->flags & HAMMER_INODE_RO)
1414                 return (EROFS);
1415         if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
1416                 return (error);
1417
1418         /*
1419          * Create a transaction to cover the operations we perform.
1420          */
1421         lwkt_gettoken(&hmp->fs_token);
1422         hammer_start_transaction(&trans, hmp);
1423         ++hammer_stats_file_iopsw;
1424
1425         /*
1426          * Add the filesystem object to the directory.  Note that neither
1427          * dip nor ip are referenced or locked, but their vnodes are
1428          * referenced.  This function will bump the inode's link count.
1429          */
1430         error = hammer_ip_add_directory(&trans, dip,
1431                                         nch->ncp->nc_name, nch->ncp->nc_nlen,
1432                                         ip);
1433
1434         /*
1435          * Finish up.
1436          */
1437         if (error == 0) {
1438                 cache_setunresolved(nch);
1439                 cache_setvp(nch, ap->a_vp);
1440         }
1441         hammer_done_transaction(&trans);
1442         hammer_knote(ap->a_vp, NOTE_LINK);
1443         hammer_knote(ap->a_dvp, NOTE_WRITE);
1444         lwkt_reltoken(&hmp->fs_token);
1445         return (error);
1446 }
1447
1448 /*
1449  * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap }
1450  *
1451  * The operating system has already ensured that the directory entry
1452  * does not exist and done all appropriate namespace locking.
1453  */
1454 static
1455 int
1456 hammer_vop_nmkdir(struct vop_nmkdir_args *ap)
1457 {
1458         struct hammer_transaction trans;
1459         struct hammer_inode *dip;
1460         struct hammer_inode *nip;
1461         struct nchandle *nch;
1462         hammer_mount_t hmp;
1463         int error;
1464
1465         nch = ap->a_nch;
1466         dip = VTOI(ap->a_dvp);
1467         hmp = dip->hmp;
1468
1469         if (dip->flags & HAMMER_INODE_RO)
1470                 return (EROFS);
1471         if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
1472                 return (error);
1473
1474         /*
1475          * Create a transaction to cover the operations we perform.
1476          */
1477         lwkt_gettoken(&hmp->fs_token);
1478         hammer_start_transaction(&trans, hmp);
1479         ++hammer_stats_file_iopsw;
1480
1481         /*
1482          * Create a new filesystem object of the requested type.  The
1483          * returned inode will be referenced but not locked.
1484          */
1485         error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1486                                     dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
1487                                     NULL, &nip);
1488         if (error) {
1489                 hkprintf("hammer_mkdir error %d\n", error);
1490                 hammer_done_transaction(&trans);
1491                 *ap->a_vpp = NULL;
1492                 lwkt_reltoken(&hmp->fs_token);
1493                 return (error);
1494         }
1495         /*
1496          * Add the new filesystem object to the directory.  This will also
1497          * bump the inode's link count.
1498          */
1499         error = hammer_ip_add_directory(&trans, dip,
1500                                         nch->ncp->nc_name, nch->ncp->nc_nlen,
1501                                         nip);
1502         if (error)
1503                 hkprintf("hammer_mkdir (add) error %d\n", error);
1504
1505         /*
1506          * Finish up.
1507          */
1508         if (error) {
1509                 hammer_rel_inode(nip, 0);
1510                 *ap->a_vpp = NULL;
1511         } else {
1512                 error = hammer_get_vnode(nip, ap->a_vpp);
1513                 hammer_rel_inode(nip, 0);
1514                 if (error == 0) {
1515                         cache_setunresolved(ap->a_nch);
1516                         cache_setvp(ap->a_nch, *ap->a_vpp);
1517                 }
1518         }
1519         hammer_done_transaction(&trans);
1520         if (error == 0)
1521                 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
1522         lwkt_reltoken(&hmp->fs_token);
1523         return (error);
1524 }
1525
1526 /*
1527  * hammer_vop_nmknod { nch, dvp, vpp, cred, vap }
1528  *
1529  * The operating system has already ensured that the directory entry
1530  * does not exist and done all appropriate namespace locking.
1531  */
1532 static
1533 int
1534 hammer_vop_nmknod(struct vop_nmknod_args *ap)
1535 {
1536         struct hammer_transaction trans;
1537         struct hammer_inode *dip;
1538         struct hammer_inode *nip;
1539         struct nchandle *nch;
1540         hammer_mount_t hmp;
1541         int error;
1542
1543         nch = ap->a_nch;
1544         dip = VTOI(ap->a_dvp);
1545         hmp = dip->hmp;
1546
1547         if (dip->flags & HAMMER_INODE_RO)
1548                 return (EROFS);
1549         if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
1550                 return (error);
1551
1552         /*
1553          * Create a transaction to cover the operations we perform.
1554          */
1555         lwkt_gettoken(&hmp->fs_token);
1556         hammer_start_transaction(&trans, hmp);
1557         ++hammer_stats_file_iopsw;
1558
1559         /*
1560          * Create a new filesystem object of the requested type.  The
1561          * returned inode will be referenced but not locked.
1562          *
1563          * If mknod specifies a directory a pseudo-fs is created.
1564          */
1565         error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1566                                     dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
1567                                     NULL, &nip);
1568         if (error) {
1569                 hammer_done_transaction(&trans);
1570                 *ap->a_vpp = NULL;
1571                 lwkt_reltoken(&hmp->fs_token);
1572                 return (error);
1573         }
1574
1575         /*
1576          * Add the new filesystem object to the directory.  This will also
1577          * bump the inode's link count.
1578          */
1579         error = hammer_ip_add_directory(&trans, dip,
1580                                         nch->ncp->nc_name, nch->ncp->nc_nlen,
1581                                         nip);
1582
1583         /*
1584          * Finish up.
1585          */
1586         if (error) {
1587                 hammer_rel_inode(nip, 0);
1588                 *ap->a_vpp = NULL;
1589         } else {
1590                 error = hammer_get_vnode(nip, ap->a_vpp);
1591                 hammer_rel_inode(nip, 0);
1592                 if (error == 0) {
1593                         cache_setunresolved(ap->a_nch);
1594                         cache_setvp(ap->a_nch, *ap->a_vpp);
1595                 }
1596         }
1597         hammer_done_transaction(&trans);
1598         if (error == 0)
1599                 hammer_knote(ap->a_dvp, NOTE_WRITE);
1600         lwkt_reltoken(&hmp->fs_token);
1601         return (error);
1602 }
1603
1604 /*
1605  * hammer_vop_open { vp, mode, cred, fp }
1606  *
1607  * MPSAFE (does not require fs_token)
1608  */
1609 static
1610 int
1611 hammer_vop_open(struct vop_open_args *ap)
1612 {
1613         hammer_inode_t ip;
1614
1615         ++hammer_stats_file_iopsr;
1616         ip = VTOI(ap->a_vp);
1617
1618         if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO))
1619                 return (EROFS);
1620         return(vop_stdopen(ap));
1621 }
1622
1623 /*
1624  * hammer_vop_print { vp }
1625  */
1626 static
1627 int
1628 hammer_vop_print(struct vop_print_args *ap)
1629 {
1630         return EOPNOTSUPP;
1631 }
1632
1633 /*
1634  * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies }
1635  */
1636 static
1637 int
1638 hammer_vop_readdir(struct vop_readdir_args *ap)
1639 {
1640         struct hammer_transaction trans;
1641         struct hammer_cursor cursor;
1642         struct hammer_inode *ip;
1643         hammer_mount_t hmp;
1644         struct uio *uio;
1645         hammer_base_elm_t base;
1646         int error;
1647         int cookie_index;
1648         int ncookies;
1649         off_t *cookies;
1650         off_t saveoff;
1651         int r;
1652         int dtype;
1653
1654         ++hammer_stats_file_iopsr;
1655         ip = VTOI(ap->a_vp);
1656         uio = ap->a_uio;
1657         saveoff = uio->uio_offset;
1658         hmp = ip->hmp;
1659
1660         if (ap->a_ncookies) {
1661                 ncookies = uio->uio_resid / 16 + 1;
1662                 if (ncookies > 1024)
1663                         ncookies = 1024;
1664                 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
1665                 cookie_index = 0;
1666         } else {
1667                 ncookies = -1;
1668                 cookies = NULL;
1669                 cookie_index = 0;
1670         }
1671
1672         lwkt_gettoken(&hmp->fs_token);
1673         hammer_simple_transaction(&trans, hmp);
1674
1675         /*
1676          * Handle artificial entries
1677          *
1678          * It should be noted that the minimum value for a directory
1679          * hash key on-media is 0x0000000100000000, so we can use anything
1680          * less then that to represent our 'special' key space.
1681          */
1682         error = 0;
1683         if (saveoff == 0) {
1684                 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, ".");
1685                 if (r)
1686                         goto done;
1687                 if (cookies)
1688                         cookies[cookie_index] = saveoff;
1689                 ++saveoff;
1690                 ++cookie_index;
1691                 if (cookie_index == ncookies)
1692                         goto done;
1693         }
1694         if (saveoff == 1) {
1695                 if (ip->ino_data.parent_obj_id) {
1696                         r = vop_write_dirent(&error, uio,
1697                                              ip->ino_data.parent_obj_id,
1698                                              DT_DIR, 2, "..");
1699                 } else {
1700                         r = vop_write_dirent(&error, uio,
1701                                              ip->obj_id, DT_DIR, 2, "..");
1702                 }
1703                 if (r)
1704                         goto done;
1705                 if (cookies)
1706                         cookies[cookie_index] = saveoff;
1707                 ++saveoff;
1708                 ++cookie_index;
1709                 if (cookie_index == ncookies)
1710                         goto done;
1711         }
1712
1713         /*
1714          * Key range (begin and end inclusive) to scan.  Directory keys
1715          * directly translate to a 64 bit 'seek' position.
1716          */
1717         hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1718         cursor.key_beg.localization = ip->obj_localization +
1719                                       hammer_dir_localization(ip);
1720         cursor.key_beg.obj_id = ip->obj_id;
1721         cursor.key_beg.create_tid = 0;
1722         cursor.key_beg.delete_tid = 0;
1723         cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1724         cursor.key_beg.obj_type = 0;
1725         cursor.key_beg.key = saveoff;
1726
1727         cursor.key_end = cursor.key_beg;
1728         cursor.key_end.key = HAMMER_MAX_KEY;
1729         cursor.asof = ip->obj_asof;
1730         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1731
1732         error = hammer_ip_first(&cursor);
1733
1734         while (error == 0) {
1735                 error = hammer_ip_resolve_data(&cursor);
1736                 if (error)
1737                         break;
1738                 base = &cursor.leaf->base;
1739                 saveoff = base->key;
1740                 KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF);
1741
1742                 if (base->obj_id != ip->obj_id)
1743                         panic("readdir: bad record at %p", cursor.node);
1744
1745                 /*
1746                  * Convert pseudo-filesystems into softlinks
1747                  */
1748                 dtype = hammer_get_dtype(cursor.leaf->base.obj_type);
1749                 r = vop_write_dirent(
1750                              &error, uio, cursor.data->entry.obj_id,
1751                              dtype,
1752                              cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF ,
1753                              (void *)cursor.data->entry.name);
1754                 if (r)
1755                         break;
1756                 ++saveoff;
1757                 if (cookies)
1758                         cookies[cookie_index] = base->key;
1759                 ++cookie_index;
1760                 if (cookie_index == ncookies)
1761                         break;
1762                 error = hammer_ip_next(&cursor);
1763         }
1764         hammer_done_cursor(&cursor);
1765
1766 done:
1767         hammer_done_transaction(&trans);
1768
1769         if (ap->a_eofflag)
1770                 *ap->a_eofflag = (error == ENOENT);
1771         uio->uio_offset = saveoff;
1772         if (error && cookie_index == 0) {
1773                 if (error == ENOENT)
1774                         error = 0;
1775                 if (cookies) {
1776                         kfree(cookies, M_TEMP);
1777                         *ap->a_ncookies = 0;
1778                         *ap->a_cookies = NULL;
1779                 }
1780         } else {
1781                 if (error == ENOENT)
1782                         error = 0;
1783                 if (cookies) {
1784                         *ap->a_ncookies = cookie_index;
1785                         *ap->a_cookies = cookies;
1786                 }
1787         }
1788         lwkt_reltoken(&hmp->fs_token);
1789         return(error);
1790 }
1791
1792 /*
1793  * hammer_vop_readlink { vp, uio, cred }
1794  */
1795 static
1796 int
1797 hammer_vop_readlink(struct vop_readlink_args *ap)
1798 {
1799         struct hammer_transaction trans;
1800         struct hammer_cursor cursor;
1801         struct hammer_inode *ip;
1802         hammer_mount_t hmp;
1803         char buf[32];
1804         u_int32_t localization;
1805         hammer_pseudofs_inmem_t pfsm;
1806         int error;
1807
1808         ip = VTOI(ap->a_vp);
1809         hmp = ip->hmp;
1810
1811         lwkt_gettoken(&hmp->fs_token);
1812
1813         /*
1814          * Shortcut if the symlink data was stuffed into ino_data.
1815          *
1816          * Also expand special "@@PFS%05d" softlinks (expansion only
1817          * occurs for non-historical (current) accesses made from the
1818          * primary filesystem).
1819          */
1820         if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) {
1821                 char *ptr;
1822                 int bytes;
1823
1824                 ptr = ip->ino_data.ext.symlink;
1825                 bytes = (int)ip->ino_data.size;
1826                 if (bytes == 10 &&
1827                     ip->obj_asof == HAMMER_MAX_TID &&
1828                     ip->obj_localization == 0 &&
1829                     strncmp(ptr, "@@PFS", 5) == 0) {
1830                         hammer_simple_transaction(&trans, hmp);
1831                         bcopy(ptr + 5, buf, 5);
1832                         buf[5] = 0;
1833                         localization = strtoul(buf, NULL, 10) << 16;
1834                         pfsm = hammer_load_pseudofs(&trans, localization,
1835                                                     &error);
1836                         if (error == 0) {
1837                                 if (pfsm->pfsd.mirror_flags &
1838                                     HAMMER_PFSD_SLAVE) {
1839                                         /* vap->va_size == 26 */
1840                                         ksnprintf(buf, sizeof(buf),
1841                                                   "@@0x%016llx:%05d",
1842                                                   (long long)pfsm->pfsd.sync_end_tid,
1843                                                   localization >> 16);
1844                                 } else {
1845                                         /* vap->va_size == 10 */
1846                                         ksnprintf(buf, sizeof(buf),
1847                                                   "@@-1:%05d",
1848                                                   localization >> 16);
1849 #if 0
1850                                         ksnprintf(buf, sizeof(buf),
1851                                                   "@@0x%016llx:%05d",
1852                                                   (long long)HAMMER_MAX_TID,
1853                                                   localization >> 16);
1854 #endif
1855                                 }
1856                                 ptr = buf;
1857                                 bytes = strlen(buf);
1858                         }
1859                         if (pfsm)
1860                                 hammer_rel_pseudofs(hmp, pfsm);
1861                         hammer_done_transaction(&trans);
1862                 }
1863                 error = uiomove(ptr, bytes, ap->a_uio);
1864                 lwkt_reltoken(&hmp->fs_token);
1865                 return(error);
1866         }
1867
1868         /*
1869          * Long version
1870          */
1871         hammer_simple_transaction(&trans, hmp);
1872         ++hammer_stats_file_iopsr;
1873         hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1874
1875         /*
1876          * Key range (begin and end inclusive) to scan.  Directory keys
1877          * directly translate to a 64 bit 'seek' position.
1878          */
1879         cursor.key_beg.localization = ip->obj_localization +
1880                                       HAMMER_LOCALIZE_MISC;
1881         cursor.key_beg.obj_id = ip->obj_id;
1882         cursor.key_beg.create_tid = 0;
1883         cursor.key_beg.delete_tid = 0;
1884         cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX;
1885         cursor.key_beg.obj_type = 0;
1886         cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK;
1887         cursor.asof = ip->obj_asof;
1888         cursor.flags |= HAMMER_CURSOR_ASOF;
1889
1890         error = hammer_ip_lookup(&cursor);
1891         if (error == 0) {
1892                 error = hammer_ip_resolve_data(&cursor);
1893                 if (error == 0) {
1894                         KKASSERT(cursor.leaf->data_len >=
1895                                  HAMMER_SYMLINK_NAME_OFF);
1896                         error = uiomove(cursor.data->symlink.name,
1897                                         cursor.leaf->data_len -
1898                                                 HAMMER_SYMLINK_NAME_OFF,
1899                                         ap->a_uio);
1900                 }
1901         }
1902         hammer_done_cursor(&cursor);
1903         hammer_done_transaction(&trans);
1904         lwkt_reltoken(&hmp->fs_token);
1905         return(error);
1906 }
1907
1908 /*
1909  * hammer_vop_nremove { nch, dvp, cred }
1910  */
1911 static
1912 int
1913 hammer_vop_nremove(struct vop_nremove_args *ap)
1914 {
1915         struct hammer_transaction trans;
1916         struct hammer_inode *dip;
1917         hammer_mount_t hmp;
1918         int error;
1919
1920         dip = VTOI(ap->a_dvp);
1921         hmp = dip->hmp;
1922
1923         if (hammer_nohistory(dip) == 0 &&
1924             (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
1925                 return (error);
1926         }
1927
1928         lwkt_gettoken(&hmp->fs_token);
1929         hammer_start_transaction(&trans, hmp);
1930         ++hammer_stats_file_iopsw;
1931         error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 0);
1932         hammer_done_transaction(&trans);
1933         if (error == 0)
1934                 hammer_knote(ap->a_dvp, NOTE_WRITE);
1935         lwkt_reltoken(&hmp->fs_token);
1936         return (error);
1937 }
1938
1939 /*
1940  * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred }
1941  */
1942 static
1943 int
1944 hammer_vop_nrename(struct vop_nrename_args *ap)
1945 {
1946         struct hammer_transaction trans;
1947         struct namecache *fncp;
1948         struct namecache *tncp;
1949         struct hammer_inode *fdip;
1950         struct hammer_inode *tdip;
1951         struct hammer_inode *ip;
1952         hammer_mount_t hmp;
1953         struct hammer_cursor cursor;
1954         int64_t namekey;
1955         u_int32_t max_iterations;
1956         int nlen, error;
1957
1958         if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount)
1959                 return(EXDEV);
1960         if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount)
1961                 return(EXDEV);
1962
1963         fdip = VTOI(ap->a_fdvp);
1964         tdip = VTOI(ap->a_tdvp);
1965         fncp = ap->a_fnch->ncp;
1966         tncp = ap->a_tnch->ncp;
1967         ip = VTOI(fncp->nc_vp);
1968         KKASSERT(ip != NULL);
1969
1970         hmp = ip->hmp;
1971
1972         if (fdip->obj_localization != tdip->obj_localization)
1973                 return(EXDEV);
1974         if (fdip->obj_localization != ip->obj_localization)
1975                 return(EXDEV);
1976
1977         if (fdip->flags & HAMMER_INODE_RO)
1978                 return (EROFS);
1979         if (tdip->flags & HAMMER_INODE_RO)
1980                 return (EROFS);
1981         if (ip->flags & HAMMER_INODE_RO)
1982                 return (EROFS);
1983         if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
1984                 return (error);
1985
1986         lwkt_gettoken(&hmp->fs_token);
1987         hammer_start_transaction(&trans, hmp);
1988         ++hammer_stats_file_iopsw;
1989
1990         /*
1991          * Remove tncp from the target directory and then link ip as
1992          * tncp. XXX pass trans to dounlink
1993          *
1994          * Force the inode sync-time to match the transaction so it is
1995          * in-sync with the creation of the target directory entry.
1996          */
1997         error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp,
1998                                 ap->a_cred, 0, -1);
1999         if (error == 0 || error == ENOENT) {
2000                 error = hammer_ip_add_directory(&trans, tdip,
2001                                                 tncp->nc_name, tncp->nc_nlen,
2002                                                 ip);
2003                 if (error == 0) {
2004                         ip->ino_data.parent_obj_id = tdip->obj_id;
2005                         ip->ino_data.ctime = trans.time;
2006                         hammer_modify_inode(&trans, ip, HAMMER_INODE_DDIRTY);
2007                 }
2008         }
2009         if (error)
2010                 goto failed; /* XXX */
2011
2012         /*
2013          * Locate the record in the originating directory and remove it.
2014          *
2015          * Calculate the namekey and setup the key range for the scan.  This
2016          * works kinda like a chained hash table where the lower 32 bits
2017          * of the namekey synthesize the chain.
2018          *
2019          * The key range is inclusive of both key_beg and key_end.
2020          */
2021         namekey = hammer_directory_namekey(fdip, fncp->nc_name, fncp->nc_nlen,
2022                                            &max_iterations);
2023 retry:
2024         hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip);
2025         cursor.key_beg.localization = fdip->obj_localization +
2026                                       hammer_dir_localization(fdip);
2027         cursor.key_beg.obj_id = fdip->obj_id;
2028         cursor.key_beg.key = namekey;
2029         cursor.key_beg.create_tid = 0;
2030         cursor.key_beg.delete_tid = 0;
2031         cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
2032         cursor.key_beg.obj_type = 0;
2033
2034         cursor.key_end = cursor.key_beg;
2035         cursor.key_end.key += max_iterations;
2036         cursor.asof = fdip->obj_asof;
2037         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
2038
2039         /*
2040          * Scan all matching records (the chain), locate the one matching
2041          * the requested path component.
2042          *
2043          * The hammer_ip_*() functions merge in-memory records with on-disk
2044          * records for the purposes of the search.
2045          */
2046         error = hammer_ip_first(&cursor);
2047         while (error == 0) {
2048                 if (hammer_ip_resolve_data(&cursor) != 0)
2049                         break;
2050                 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
2051                 KKASSERT(nlen > 0);
2052                 if (fncp->nc_nlen == nlen &&
2053                     bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) {
2054                         break;
2055                 }
2056                 error = hammer_ip_next(&cursor);
2057         }
2058
2059         /*
2060          * If all is ok we have to get the inode so we can adjust nlinks.
2061          *
2062          * WARNING: hammer_ip_del_directory() may have to terminate the
2063          * cursor to avoid a recursion.  It's ok to call hammer_done_cursor()
2064          * twice.
2065          */
2066         if (error == 0)
2067                 error = hammer_ip_del_directory(&trans, &cursor, fdip, ip);
2068
2069         /*
2070          * XXX A deadlock here will break rename's atomicy for the purposes
2071          * of crash recovery.
2072          */
2073         if (error == EDEADLK) {
2074                 hammer_done_cursor(&cursor);
2075                 goto retry;
2076         }
2077
2078         /*
2079          * Cleanup and tell the kernel that the rename succeeded.
2080          *
2081          * NOTE: ip->vp, if non-NULL, cannot be directly referenced
2082          *       without formally acquiring the vp since the vp might
2083          *       have zero refs on it, or in the middle of a reclaim,
2084          *       etc.
2085          */
2086         hammer_done_cursor(&cursor);
2087         if (error == 0) {
2088                 cache_rename(ap->a_fnch, ap->a_tnch);
2089                 hammer_knote(ap->a_fdvp, NOTE_WRITE);
2090                 hammer_knote(ap->a_tdvp, NOTE_WRITE);
2091                 while (ip->vp) {
2092                         struct vnode *vp;
2093
2094                         error = hammer_get_vnode(ip, &vp);
2095                         if (error == 0 && vp) {
2096                                 vn_unlock(vp);
2097                                 hammer_knote(ip->vp, NOTE_RENAME);
2098                                 vrele(vp);
2099                                 break;
2100                         }
2101                         kprintf("Debug: HAMMER ip/vp race2 avoided\n");
2102                 }
2103         }
2104
2105 failed:
2106         hammer_done_transaction(&trans);
2107         lwkt_reltoken(&hmp->fs_token);
2108         return (error);
2109 }
2110
2111 /*
2112  * hammer_vop_nrmdir { nch, dvp, cred }
2113  */
2114 static
2115 int
2116 hammer_vop_nrmdir(struct vop_nrmdir_args *ap)
2117 {
2118         struct hammer_transaction trans;
2119         struct hammer_inode *dip;
2120         hammer_mount_t hmp;
2121         int error;
2122
2123         dip = VTOI(ap->a_dvp);
2124         hmp = dip->hmp;
2125
2126         if (hammer_nohistory(dip) == 0 &&
2127             (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
2128                 return (error);
2129         }
2130
2131         lwkt_gettoken(&hmp->fs_token);
2132         hammer_start_transaction(&trans, hmp);
2133         ++hammer_stats_file_iopsw;
2134         error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 1);
2135         hammer_done_transaction(&trans);
2136         if (error == 0)
2137                 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
2138         lwkt_reltoken(&hmp->fs_token);
2139         return (error);
2140 }
2141
2142 /*
2143  * hammer_vop_markatime { vp, cred }
2144  */
2145 static
2146 int
2147 hammer_vop_markatime(struct vop_markatime_args *ap)
2148 {
2149         struct hammer_transaction trans;
2150         struct hammer_inode *ip;
2151         hammer_mount_t hmp;
2152
2153         ip = VTOI(ap->a_vp);
2154         if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
2155                 return (EROFS);
2156         if (ip->flags & HAMMER_INODE_RO)
2157                 return (EROFS);
2158         hmp = ip->hmp;
2159         if (hmp->mp->mnt_flag & MNT_NOATIME)
2160                 return (0);
2161         lwkt_gettoken(&hmp->fs_token);
2162         hammer_start_transaction(&trans, hmp);
2163         ++hammer_stats_file_iopsw;
2164
2165         ip->ino_data.atime = trans.time;
2166         hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME);
2167         hammer_done_transaction(&trans);
2168         hammer_knote(ap->a_vp, NOTE_ATTRIB);
2169         lwkt_reltoken(&hmp->fs_token);
2170         return (0);
2171 }
2172
2173 /*
2174  * hammer_vop_setattr { vp, vap, cred }
2175  */
2176 static
2177 int
2178 hammer_vop_setattr(struct vop_setattr_args *ap)
2179 {
2180         struct hammer_transaction trans;
2181         struct hammer_inode *ip;
2182         struct vattr *vap;
2183         hammer_mount_t hmp;
2184         int modflags;
2185         int error;
2186         int truncating;
2187         int blksize;
2188         int kflags;
2189 #if 0
2190         int64_t aligned_size;
2191 #endif
2192         u_int32_t flags;
2193
2194         vap = ap->a_vap;
2195         ip = ap->a_vp->v_data;
2196         modflags = 0;
2197         kflags = 0;
2198         hmp = ip->hmp;
2199
2200         if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
2201                 return(EROFS);
2202         if (ip->flags & HAMMER_INODE_RO)
2203                 return (EROFS);
2204         if (hammer_nohistory(ip) == 0 &&
2205             (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
2206                 return (error);
2207         }
2208
2209         lwkt_gettoken(&hmp->fs_token);
2210         hammer_start_transaction(&trans, hmp);
2211         ++hammer_stats_file_iopsw;
2212         error = 0;
2213
2214         if (vap->va_flags != VNOVAL) {
2215                 flags = ip->ino_data.uflags;
2216                 error = vop_helper_setattr_flags(&flags, vap->va_flags,
2217                                          hammer_to_unix_xid(&ip->ino_data.uid),
2218                                          ap->a_cred);
2219                 if (error == 0) {
2220                         if (ip->ino_data.uflags != flags) {
2221                                 ip->ino_data.uflags = flags;
2222                                 ip->ino_data.ctime = trans.time;
2223                                 modflags |= HAMMER_INODE_DDIRTY;
2224                                 kflags |= NOTE_ATTRIB;
2225                         }
2226                         if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
2227                                 error = 0;
2228                                 goto done;
2229                         }
2230                 }
2231                 goto done;
2232         }
2233         if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
2234                 error = EPERM;
2235                 goto done;
2236         }
2237         if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
2238                 mode_t cur_mode = ip->ino_data.mode;
2239                 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid);
2240                 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid);
2241                 uuid_t uuid_uid;
2242                 uuid_t uuid_gid;
2243
2244                 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid,
2245                                          ap->a_cred,
2246                                          &cur_uid, &cur_gid, &cur_mode);
2247                 if (error == 0) {
2248                         hammer_guid_to_uuid(&uuid_uid, cur_uid);
2249                         hammer_guid_to_uuid(&uuid_gid, cur_gid);
2250                         if (bcmp(&uuid_uid, &ip->ino_data.uid,
2251                                  sizeof(uuid_uid)) ||
2252                             bcmp(&uuid_gid, &ip->ino_data.gid,
2253                                  sizeof(uuid_gid)) ||
2254                             ip->ino_data.mode != cur_mode
2255                         ) {
2256                                 ip->ino_data.uid = uuid_uid;
2257                                 ip->ino_data.gid = uuid_gid;
2258                                 ip->ino_data.mode = cur_mode;
2259                                 ip->ino_data.ctime = trans.time;
2260                                 modflags |= HAMMER_INODE_DDIRTY;
2261                         }
2262                         kflags |= NOTE_ATTRIB;
2263                 }
2264         }
2265         while (vap->va_size != VNOVAL && ip->ino_data.size != vap->va_size) {
2266                 switch(ap->a_vp->v_type) {
2267                 case VREG:
2268                         if (vap->va_size == ip->ino_data.size)
2269                                 break;
2270
2271                         /*
2272                          * Log the operation if in fast-fsync mode or if
2273                          * there are unterminated redo write records present.
2274                          *
2275                          * The second check is needed so the recovery code
2276                          * properly truncates write redos even if nominal
2277                          * REDO operations is turned off due to excessive
2278                          * writes, because the related records might be
2279                          * destroyed and never lay down a TERM_WRITE.
2280                          */
2281                         if ((ip->flags & HAMMER_INODE_REDO) ||
2282                             (ip->flags & HAMMER_INODE_RDIRTY)) {
2283                                 error = hammer_generate_redo(&trans, ip,
2284                                                              vap->va_size,
2285                                                              HAMMER_REDO_TRUNC,
2286                                                              NULL, 0);
2287                         }
2288                         blksize = hammer_blocksize(vap->va_size);
2289
2290                         /*
2291                          * XXX break atomicy, we can deadlock the backend
2292                          * if we do not release the lock.  Probably not a
2293                          * big deal here.
2294                          */
2295                         if (vap->va_size < ip->ino_data.size) {
2296                                 nvtruncbuf(ap->a_vp, vap->va_size,
2297                                            blksize,
2298                                            hammer_blockoff(vap->va_size),
2299                                            0);
2300                                 truncating = 1;
2301                                 kflags |= NOTE_WRITE;
2302                         } else {
2303                                 nvextendbuf(ap->a_vp,
2304                                             ip->ino_data.size,
2305                                             vap->va_size,
2306                                             hammer_blocksize(ip->ino_data.size),
2307                                             hammer_blocksize(vap->va_size),
2308                                             hammer_blockoff(ip->ino_data.size),
2309                                             hammer_blockoff(vap->va_size),
2310                                             0);
2311                                 truncating = 0;
2312                                 kflags |= NOTE_WRITE | NOTE_EXTEND;
2313                         }
2314                         ip->ino_data.size = vap->va_size;
2315                         ip->ino_data.mtime = trans.time;
2316                         /* XXX safe to use SDIRTY instead of DDIRTY here? */
2317                         modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY;
2318
2319                         /*
2320                          * On-media truncation is cached in the inode until
2321                          * the inode is synchronized.  We must immediately
2322                          * handle any frontend records.
2323                          */
2324                         if (truncating) {
2325                                 hammer_ip_frontend_trunc(ip, vap->va_size);
2326 #ifdef DEBUG_TRUNCATE
2327                                 if (HammerTruncIp == NULL)
2328                                         HammerTruncIp = ip;
2329 #endif
2330                                 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) {
2331                                         ip->flags |= HAMMER_INODE_TRUNCATED;
2332                                         ip->trunc_off = vap->va_size;
2333                                         hammer_inode_dirty(ip);
2334 #ifdef DEBUG_TRUNCATE
2335                                         if (ip == HammerTruncIp)
2336                                         kprintf("truncate1 %016llx\n",
2337                                                 (long long)ip->trunc_off);
2338 #endif
2339                                 } else if (ip->trunc_off > vap->va_size) {
2340                                         ip->trunc_off = vap->va_size;
2341 #ifdef DEBUG_TRUNCATE
2342                                         if (ip == HammerTruncIp)
2343                                         kprintf("truncate2 %016llx\n",
2344                                                 (long long)ip->trunc_off);
2345 #endif
2346                                 } else {
2347 #ifdef DEBUG_TRUNCATE
2348                                         if (ip == HammerTruncIp)
2349                                         kprintf("truncate3 %016llx (ignored)\n",
2350                                                 (long long)vap->va_size);
2351 #endif
2352                                 }
2353                         }
2354
2355 #if 0
2356                         /*
2357                          * When truncating, nvtruncbuf() may have cleaned out
2358                          * a portion of the last block on-disk in the buffer
2359                          * cache.  We must clean out any frontend records
2360                          * for blocks beyond the new last block.
2361                          */
2362                         aligned_size = (vap->va_size + (blksize - 1)) &
2363                                        ~(int64_t)(blksize - 1);
2364                         if (truncating && vap->va_size < aligned_size) {
2365                                 aligned_size -= blksize;
2366                                 hammer_ip_frontend_trunc(ip, aligned_size);
2367                         }
2368 #endif
2369                         break;
2370                 case VDATABASE:
2371                         if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) {
2372                                 ip->flags |= HAMMER_INODE_TRUNCATED;
2373                                 ip->trunc_off = vap->va_size;
2374                                 hammer_inode_dirty(ip);
2375                         } else if (ip->trunc_off > vap->va_size) {
2376                                 ip->trunc_off = vap->va_size;
2377                         }
2378                         hammer_ip_frontend_trunc(ip, vap->va_size);
2379                         ip->ino_data.size = vap->va_size;
2380                         ip->ino_data.mtime = trans.time;
2381                         modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY;
2382                         kflags |= NOTE_ATTRIB;
2383                         break;
2384                 default:
2385                         error = EINVAL;
2386                         goto done;
2387                 }
2388                 break;
2389         }
2390         if (vap->va_atime.tv_sec != VNOVAL) {
2391                 ip->ino_data.atime = hammer_timespec_to_time(&vap->va_atime);
2392                 modflags |= HAMMER_INODE_ATIME;
2393                 kflags |= NOTE_ATTRIB;
2394         }
2395         if (vap->va_mtime.tv_sec != VNOVAL) {
2396                 ip->ino_data.mtime = hammer_timespec_to_time(&vap->va_mtime);
2397                 modflags |= HAMMER_INODE_MTIME;
2398                 kflags |= NOTE_ATTRIB;
2399         }
2400         if (vap->va_mode != (mode_t)VNOVAL) {
2401                 mode_t   cur_mode = ip->ino_data.mode;
2402                 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid);
2403                 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid);
2404
2405                 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred,
2406                                          cur_uid, cur_gid, &cur_mode);
2407                 if (error == 0 && ip->ino_data.mode != cur_mode) {
2408                         ip->ino_data.mode = cur_mode;
2409                         ip->ino_data.ctime = trans.time;
2410                         modflags |= HAMMER_INODE_DDIRTY;
2411                         kflags |= NOTE_ATTRIB;
2412                 }
2413         }
2414 done:
2415         if (error == 0)
2416                 hammer_modify_inode(&trans, ip, modflags);
2417         hammer_done_transaction(&trans);
2418         hammer_knote(ap->a_vp, kflags);
2419         lwkt_reltoken(&hmp->fs_token);
2420         return (error);
2421 }
2422
2423 /*
2424  * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target }
2425  */
2426 static
2427 int
2428 hammer_vop_nsymlink(struct vop_nsymlink_args *ap)
2429 {
2430         struct hammer_transaction trans;
2431         struct hammer_inode *dip;
2432         struct hammer_inode *nip;
2433         hammer_record_t record;
2434         struct nchandle *nch;
2435         hammer_mount_t hmp;
2436         int error;
2437         int bytes;
2438
2439         ap->a_vap->va_type = VLNK;
2440
2441         nch = ap->a_nch;
2442         dip = VTOI(ap->a_dvp);
2443         hmp = dip->hmp;
2444
2445         if (dip->flags & HAMMER_INODE_RO)
2446                 return (EROFS);
2447         if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
2448                 return (error);
2449
2450         /*
2451          * Create a transaction to cover the operations we perform.
2452          */
2453         lwkt_gettoken(&hmp->fs_token);
2454         hammer_start_transaction(&trans, hmp);
2455         ++hammer_stats_file_iopsw;
2456
2457         /*
2458          * Create a new filesystem object of the requested type.  The
2459          * returned inode will be referenced but not locked.
2460          */
2461
2462         error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
2463                                     dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
2464                                     NULL, &nip);
2465         if (error) {
2466                 hammer_done_transaction(&trans);
2467                 *ap->a_vpp = NULL;
2468                 lwkt_reltoken(&hmp->fs_token);
2469                 return (error);
2470         }
2471
2472         /*
2473          * Add a record representing the symlink.  symlink stores the link
2474          * as pure data, not a string, and is no \0 terminated.
2475          */
2476         if (error == 0) {
2477                 bytes = strlen(ap->a_target);
2478
2479                 if (bytes <= HAMMER_INODE_BASESYMLEN) {
2480                         bcopy(ap->a_target, nip->ino_data.ext.symlink, bytes);
2481                 } else {
2482                         record = hammer_alloc_mem_record(nip, bytes);
2483                         record->type = HAMMER_MEM_RECORD_GENERAL;
2484
2485                         record->leaf.base.localization = nip->obj_localization +
2486                                                          HAMMER_LOCALIZE_MISC;
2487                         record->leaf.base.key = HAMMER_FIXKEY_SYMLINK;
2488                         record->leaf.base.rec_type = HAMMER_RECTYPE_FIX;
2489                         record->leaf.data_len = bytes;
2490                         KKASSERT(HAMMER_SYMLINK_NAME_OFF == 0);
2491                         bcopy(ap->a_target, record->data->symlink.name, bytes);
2492                         error = hammer_ip_add_record(&trans, record);
2493                 }
2494
2495                 /*
2496                  * Set the file size to the length of the link.
2497                  */
2498                 if (error == 0) {
2499                         nip->ino_data.size = bytes;
2500                         hammer_modify_inode(&trans, nip, HAMMER_INODE_DDIRTY);
2501                 }
2502         }
2503         if (error == 0)
2504                 error = hammer_ip_add_directory(&trans, dip, nch->ncp->nc_name,
2505                                                 nch->ncp->nc_nlen, nip);
2506
2507         /*
2508          * Finish up.
2509          */
2510         if (error) {
2511                 hammer_rel_inode(nip, 0);
2512                 *ap->a_vpp = NULL;
2513         } else {
2514                 error = hammer_get_vnode(nip, ap->a_vpp);
2515                 hammer_rel_inode(nip, 0);
2516                 if (error == 0) {
2517                         cache_setunresolved(ap->a_nch);
2518                         cache_setvp(ap->a_nch, *ap->a_vpp);
2519                         hammer_knote(ap->a_dvp, NOTE_WRITE);
2520                 }
2521         }
2522         hammer_done_transaction(&trans);
2523         lwkt_reltoken(&hmp->fs_token);
2524         return (error);
2525 }
2526
2527 /*
2528  * hammer_vop_nwhiteout { nch, dvp, cred, flags }
2529  */
2530 static
2531 int
2532 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap)
2533 {
2534         struct hammer_transaction trans;
2535         struct hammer_inode *dip;
2536         hammer_mount_t hmp;
2537         int error;
2538
2539         dip = VTOI(ap->a_dvp);
2540         hmp = dip->hmp;
2541
2542         if (hammer_nohistory(dip) == 0 &&
2543             (error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) {
2544                 return (error);
2545         }
2546
2547         lwkt_gettoken(&hmp->fs_token);
2548         hammer_start_transaction(&trans, hmp);
2549         ++hammer_stats_file_iopsw;
2550         error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp,
2551                                 ap->a_cred, ap->a_flags, -1);
2552         hammer_done_transaction(&trans);
2553         lwkt_reltoken(&hmp->fs_token);
2554
2555         return (error);
2556 }
2557
2558 /*
2559  * hammer_vop_ioctl { vp, command, data, fflag, cred }
2560  */
2561 static
2562 int
2563 hammer_vop_ioctl(struct vop_ioctl_args *ap)
2564 {
2565         struct hammer_inode *ip = ap->a_vp->v_data;
2566         hammer_mount_t hmp = ip->hmp;
2567         int error;
2568
2569         ++hammer_stats_file_iopsr;
2570         lwkt_gettoken(&hmp->fs_token);
2571         error = hammer_ioctl(ip, ap->a_command, ap->a_data,
2572                              ap->a_fflag, ap->a_cred);
2573         lwkt_reltoken(&hmp->fs_token);
2574         return (error);
2575 }
2576
2577 static
2578 int
2579 hammer_vop_mountctl(struct vop_mountctl_args *ap)
2580 {
2581         static const struct mountctl_opt extraopt[] = {
2582                 { HMNT_NOHISTORY,       "nohistory" },
2583                 { HMNT_MASTERID,        "master" },
2584                 { 0, NULL}
2585
2586         };
2587         struct hammer_mount *hmp;
2588         struct mount *mp;
2589         int usedbytes;
2590         int error;
2591
2592         error = 0;
2593         usedbytes = 0;
2594         mp = ap->a_head.a_ops->head.vv_mount;
2595         KKASSERT(mp->mnt_data != NULL);
2596         hmp = (struct hammer_mount *)mp->mnt_data;
2597
2598         lwkt_gettoken(&hmp->fs_token);
2599
2600         switch(ap->a_op) {
2601         case MOUNTCTL_SET_EXPORT:
2602                 if (ap->a_ctllen != sizeof(struct export_args))
2603                         error = EINVAL;
2604                 else
2605                         error = hammer_vfs_export(mp, ap->a_op,
2606                                       (const struct export_args *)ap->a_ctl);
2607                 break;
2608         case MOUNTCTL_MOUNTFLAGS:
2609         {
2610                 /*
2611                  * Call standard mountctl VOP function
2612                  * so we get user mount flags.
2613                  */
2614                 error = vop_stdmountctl(ap);
2615                 if (error)
2616                         break;
2617
2618                 usedbytes = *ap->a_res;
2619
2620                 if (usedbytes > 0 && usedbytes < ap->a_buflen) {
2621                         usedbytes += vfs_flagstostr(hmp->hflags, extraopt,
2622                                                     ap->a_buf,
2623                                                     ap->a_buflen - usedbytes,
2624                                                     &error);
2625                 }
2626
2627                 *ap->a_res += usedbytes;
2628                 break;
2629         }
2630         default:
2631                 error = vop_stdmountctl(ap);
2632                 break;
2633         }
2634         lwkt_reltoken(&hmp->fs_token);
2635         return(error);
2636 }
2637
2638 /*
2639  * hammer_vop_strategy { vp, bio }
2640  *
2641  * Strategy call, used for regular file read & write only.  Note that the
2642  * bp may represent a cluster.
2643  *
2644  * To simplify operation and allow better optimizations in the future,
2645  * this code does not make any assumptions with regards to buffer alignment
2646  * or size.
2647  */
2648 static
2649 int
2650 hammer_vop_strategy(struct vop_strategy_args *ap)
2651 {
2652         struct buf *bp;
2653         int error;
2654
2655         bp = ap->a_bio->bio_buf;
2656
2657         switch(bp->b_cmd) {
2658         case BUF_CMD_READ:
2659                 error = hammer_vop_strategy_read(ap);
2660                 break;
2661         case BUF_CMD_WRITE:
2662                 error = hammer_vop_strategy_write(ap);
2663                 break;
2664         default:
2665                 bp->b_error = error = EINVAL;
2666                 bp->b_flags |= B_ERROR;
2667                 biodone(ap->a_bio);
2668                 break;
2669         }
2670
2671         /* hammer_dump_dedup_cache(((hammer_inode_t)ap->a_vp->v_data)->hmp); */
2672
2673         return (error);
2674 }
2675
2676 /*
2677  * Read from a regular file.  Iterate the related records and fill in the
2678  * BIO/BUF.  Gaps are zero-filled.
2679  *
2680  * The support code in hammer_object.c should be used to deal with mixed
2681  * in-memory and on-disk records.
2682  *
2683  * NOTE: Can be called from the cluster code with an oversized buf.
2684  *
2685  * XXX atime update
2686  */
2687 static
2688 int
2689 hammer_vop_strategy_read(struct vop_strategy_args *ap)
2690 {
2691         struct hammer_transaction trans;
2692         struct hammer_inode *ip;
2693         struct hammer_inode *dip;
2694         hammer_mount_t hmp;
2695         struct hammer_cursor cursor;
2696         hammer_base_elm_t base;
2697         hammer_off_t disk_offset;
2698         struct bio *bio;
2699         struct bio *nbio;
2700         struct buf *bp;
2701         int64_t rec_offset;
2702         int64_t ran_end;
2703         int64_t tmp64;
2704         int error;
2705         int boff;
2706         int roff;
2707         int n;
2708         int isdedupable;
2709
2710         bio = ap->a_bio;
2711         bp = bio->bio_buf;
2712         ip = ap->a_vp->v_data;
2713         hmp = ip->hmp;
2714
2715         /*
2716          * The zone-2 disk offset may have been set by the cluster code via
2717          * a BMAP operation, or else should be NOOFFSET.
2718          *
2719          * Checking the high bits for a match against zone-2 should suffice.
2720          *
2721          * In cases where a lot of data duplication is present it may be
2722          * more beneficial to drop through and doubule-buffer through the
2723          * device.
2724          */
2725         nbio = push_bio(bio);
2726         if ((nbio->bio_offset & HAMMER_OFF_ZONE_MASK) ==
2727             HAMMER_ZONE_LARGE_DATA) {
2728                 if (hammer_double_buffer == 0) {
2729                         lwkt_gettoken(&hmp->fs_token);
2730                         error = hammer_io_direct_read(hmp, nbio, NULL);
2731                         lwkt_reltoken(&hmp->fs_token);
2732                         return (error);
2733                 }
2734
2735                 /*
2736                  * Try to shortcut requests for double_buffer mode too.
2737                  * Since this mode runs through the device buffer cache
2738                  * only compatible buffer sizes (meaning those generated
2739                  * by normal filesystem buffers) are legal.
2740                  */
2741                 if (hammer_live_dedup == 0 && (bp->b_flags & B_PAGING) == 0) {
2742                         lwkt_gettoken(&hmp->fs_token);
2743                         error = hammer_io_indirect_read(hmp, nbio, NULL);
2744                         lwkt_reltoken(&hmp->fs_token);
2745                         return (error);
2746                 }
2747         }
2748
2749         /*
2750          * Well, that sucked.  Do it the hard way.  If all the stars are
2751          * aligned we may still be able to issue a direct-read.
2752          */
2753         lwkt_gettoken(&hmp->fs_token);
2754         hammer_simple_transaction(&trans, hmp);
2755         hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
2756
2757         /*
2758          * Key range (begin and end inclusive) to scan.  Note that the key's
2759          * stored in the actual records represent BASE+LEN, not BASE.  The
2760          * first record containing bio_offset will have a key > bio_offset.
2761          */
2762         cursor.key_beg.localization = ip->obj_localization +
2763                                       HAMMER_LOCALIZE_MISC;
2764         cursor.key_beg.obj_id = ip->obj_id;
2765         cursor.key_beg.create_tid = 0;
2766         cursor.key_beg.delete_tid = 0;
2767         cursor.key_beg.obj_type = 0;
2768         cursor.key_beg.key = bio->bio_offset + 1;
2769         cursor.asof = ip->obj_asof;
2770         cursor.flags |= HAMMER_CURSOR_ASOF;
2771
2772         cursor.key_end = cursor.key_beg;
2773         KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
2774 #if 0
2775         if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) {
2776                 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB;
2777                 cursor.key_end.rec_type = HAMMER_RECTYPE_DB;
2778                 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2779         } else
2780 #endif
2781         {
2782                 ran_end = bio->bio_offset + bp->b_bufsize;
2783                 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
2784                 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
2785                 tmp64 = ran_end + MAXPHYS + 1;  /* work-around GCC-4 bug */
2786                 if (tmp64 < ran_end)
2787                         cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2788                 else
2789                         cursor.key_end.key = ran_end + MAXPHYS + 1;
2790         }
2791         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
2792
2793         /*
2794          * Set NOSWAPCACHE for cursor data extraction if double buffering
2795          * is disabled or (if the file is not marked cacheable via chflags
2796          * and vm.swapcache_use_chflags is enabled).
2797          */
2798         if (hammer_double_buffer == 0 ||
2799             ((ap->a_vp->v_flag & VSWAPCACHE) == 0 &&
2800              vm_swapcache_use_chflags)) {
2801                 cursor.flags |= HAMMER_CURSOR_NOSWAPCACHE;
2802         }
2803
2804         error = hammer_ip_first(&cursor);
2805         boff = 0;
2806
2807         while (error == 0) {
2808                 /*
2809                  * Get the base file offset of the record.  The key for
2810                  * data records is (base + bytes) rather then (base).
2811                  */
2812                 base = &cursor.leaf->base;
2813                 rec_offset = base->key - cursor.leaf->data_len;
2814
2815                 /*
2816                  * Calculate the gap, if any, and zero-fill it.
2817                  *
2818                  * n is the offset of the start of the record verses our
2819                  * current seek offset in the bio.
2820                  */
2821                 n = (int)(rec_offset - (bio->bio_offset + boff));
2822                 if (n > 0) {
2823                         if (n > bp->b_bufsize - boff)
2824                                 n = bp->b_bufsize - boff;
2825                         bzero((char *)bp->b_data + boff, n);
2826                         boff += n;
2827                         n = 0;
2828                 }
2829
2830                 /*
2831                  * Calculate the data offset in the record and the number
2832                  * of bytes we can copy.
2833                  *
2834                  * There are two degenerate cases.  First, boff may already
2835                  * be at bp->b_bufsize.  Secondly, the data offset within
2836                  * the record may exceed the record's size.
2837                  */
2838                 roff = -n;
2839                 rec_offset += roff;
2840                 n = cursor.leaf->data_len - roff;
2841                 if (n <= 0) {
2842                         kprintf("strategy_read: bad n=%d roff=%d\n", n, roff);
2843                         n = 0;
2844                 } else if (n > bp->b_bufsize - boff) {
2845                         n = bp->b_bufsize - boff;
2846                 }
2847
2848                 /*
2849                  * Deal with cached truncations.  This cool bit of code
2850                  * allows truncate()/ftruncate() to avoid having to sync
2851                  * the file.
2852                  *
2853                  * If the frontend is truncated then all backend records are
2854                  * subject to the frontend's truncation.
2855                  *
2856                  * If the backend is truncated then backend records on-disk
2857                  * (but not in-memory) are subject to the backend's
2858                  * truncation.  In-memory records owned by the backend
2859                  * represent data written after the truncation point on the
2860                  * backend and must not be truncated.
2861                  *
2862                  * Truncate operations deal with frontend buffer cache
2863                  * buffers and frontend-owned in-memory records synchronously.
2864                  */
2865                 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2866                         if (hammer_cursor_ondisk(&cursor)/* ||
2867                             cursor.iprec->flush_state == HAMMER_FST_FLUSH*/) {
2868                                 if (ip->trunc_off <= rec_offset)
2869                                         n = 0;
2870                                 else if (ip->trunc_off < rec_offset + n)
2871                                         n = (int)(ip->trunc_off - rec_offset);
2872                         }
2873                 }
2874                 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2875                         if (hammer_cursor_ondisk(&cursor)) {
2876                                 if (ip->sync_trunc_off <= rec_offset)
2877                                         n = 0;
2878                                 else if (ip->sync_trunc_off < rec_offset + n)
2879                                         n = (int)(ip->sync_trunc_off - rec_offset);
2880                         }
2881                 }
2882
2883                 /*
2884                  * Try to issue a direct read into our bio if possible,
2885                  * otherwise resolve the element data into a hammer_buffer
2886                  * and copy.
2887                  *
2888                  * The buffer on-disk should be zerod past any real
2889                  * truncation point, but may not be for any synthesized
2890                  * truncation point from above.
2891                  *
2892                  * NOTE: disk_offset is only valid if the cursor data is
2893                  *       on-disk.
2894                  */
2895                 disk_offset = cursor.leaf->data_offset + roff;
2896                 isdedupable = (boff == 0 && n == bp->b_bufsize &&
2897                                hammer_cursor_ondisk(&cursor) &&
2898                                ((int)disk_offset & HAMMER_BUFMASK) == 0);
2899
2900                 if (isdedupable && hammer_double_buffer == 0) {
2901                         /*
2902                          * Direct read case
2903                          */
2904                         KKASSERT((disk_offset & HAMMER_OFF_ZONE_MASK) ==
2905                                  HAMMER_ZONE_LARGE_DATA);
2906                         nbio->bio_offset = disk_offset;
2907                         error = hammer_io_direct_read(hmp, nbio, cursor.leaf);
2908                         if (hammer_live_dedup && error == 0)
2909                                 hammer_dedup_cache_add(ip, cursor.leaf);
2910                         goto done;
2911                 } else if (isdedupable) {
2912                         /*
2913                          * Async I/O case for reading from backing store
2914                          * and copying the data to the filesystem buffer.
2915                          * live-dedup has to verify the data anyway if it
2916                          * gets a hit later so we can just add the entry
2917                          * now.
2918                          */
2919                         KKASSERT((disk_offset & HAMMER_OFF_ZONE_MASK) ==
2920                                  HAMMER_ZONE_LARGE_DATA);
2921                         nbio->bio_offset = disk_offset;
2922                         if (hammer_live_dedup)
2923                                 hammer_dedup_cache_add(ip, cursor.leaf);
2924                         error = hammer_io_indirect_read(hmp, nbio, cursor.leaf);
2925                         goto done;
2926                 } else if (n) {
2927                         error = hammer_ip_resolve_data(&cursor);
2928                         if (error == 0) {
2929                                 if (hammer_live_dedup && isdedupable)
2930                                         hammer_dedup_cache_add(ip, cursor.leaf);
2931                                 bcopy((char *)cursor.data + roff,
2932                                       (char *)bp->b_data + boff, n);
2933                         }
2934                 }
2935                 if (error)
2936                         break;
2937
2938                 /*
2939                  * We have to be sure that the only elements added to the
2940                  * dedup cache are those which are already on-media.
2941                  */
2942                 if (hammer_live_dedup && hammer_cursor_ondisk(&cursor))
2943                         hammer_dedup_cache_add(ip, cursor.leaf);
2944
2945                 /*
2946                  * Iterate until we have filled the request.
2947                  */
2948                 boff += n;
2949                 if (boff == bp->b_bufsize)
2950                         break;
2951                 error = hammer_ip_next(&cursor);
2952         }
2953
2954         /*
2955          * There may have been a gap after the last record
2956          */
2957         if (error == ENOENT)
2958                 error = 0;
2959         if (error == 0 && boff != bp->b_bufsize) {
2960                 KKASSERT(boff < bp->b_bufsize);
2961                 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff);
2962                 /* boff = bp->b_bufsize; */
2963         }
2964
2965         /*
2966          * Disallow swapcache operation on the vnode buffer if double
2967          * buffering is enabled, the swapcache will get the data via
2968          * the block device buffer.
2969          */
2970         if (hammer_double_buffer)
2971                 bp->b_flags |= B_NOTMETA;
2972
2973         /*
2974          * Cleanup
2975          */
2976         bp->b_resid = 0;
2977         bp->b_error = error;
2978         if (error)
2979                 bp->b_flags |= B_ERROR;
2980         biodone(ap->a_bio);
2981
2982 done:
2983         /*
2984          * Cache the b-tree node for the last data read in cache[1].
2985          *
2986          * If we hit the file EOF then also cache the node in the
2987          * governing director's cache[3], it will be used to initialize
2988          * the inode's cache[1] for any inodes looked up via the directory.
2989          *
2990          * This doesn't reduce disk accesses since the B-Tree chain is
2991          * likely cached, but it does reduce cpu overhead when looking
2992          * up file offsets for cpdup/tar/cpio style iterations.
2993          */
2994         if (cursor.node)
2995                 hammer_cache_node(&ip->cache[1], cursor.node);
2996         if (ran_end >= ip->ino_data.size) {
2997                 dip = hammer_find_inode(&trans, ip->ino_data.parent_obj_id,
2998                                         ip->obj_asof, ip->obj_localization);
2999                 if (dip) {
3000                         hammer_cache_node(&dip->cache[3], cursor.node);
3001                         hammer_rel_inode(dip, 0);
3002                 }
3003         }
3004         hammer_done_cursor(&cursor);
3005         hammer_done_transaction(&trans);
3006         lwkt_reltoken(&hmp->fs_token);
3007         return(error);
3008 }
3009
3010 /*
3011  * BMAP operation - used to support cluster_read() only.
3012  *
3013  * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb)
3014  *
3015  * This routine may return EOPNOTSUPP if the opration is not supported for
3016  * the specified offset.  The contents of the pointer arguments do not
3017  * need to be initialized in that case.
3018  *
3019  * If a disk address is available and properly aligned return 0 with
3020  * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately
3021  * to the run-length relative to that offset.  Callers may assume that
3022  * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently
3023  * large, so return EOPNOTSUPP if it is not sufficiently large.
3024  */
3025 static
3026 int
3027 hammer_vop_bmap(struct vop_bmap_args *ap)
3028 {
3029         struct hammer_transaction trans;
3030         struct hammer_inode *ip;
3031         hammer_mount_t hmp;
3032         struct hammer_cursor cursor;
3033         hammer_base_elm_t base;
3034         int64_t rec_offset;
3035         int64_t ran_end;
3036         int64_t tmp64;
3037         int64_t base_offset;
3038         int64_t base_disk_offset;
3039         int64_t last_offset;
3040         hammer_off_t last_disk_offset;
3041         hammer_off_t disk_offset;
3042         int     rec_len;
3043         int     error;
3044         int     blksize;
3045
3046         ++hammer_stats_file_iopsr;
3047         ip = ap->a_vp->v_data;
3048         hmp = ip->hmp;
3049
3050         /*
3051          * We can only BMAP regular files.  We can't BMAP database files,
3052          * directories, etc.
3053          */
3054         if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE)
3055                 return(EOPNOTSUPP);
3056
3057         /*
3058          * bmap is typically called with runp/runb both NULL when used
3059          * for writing.  We do not support BMAP for writing atm.
3060          */
3061         if (ap->a_cmd != BUF_CMD_READ)
3062                 return(EOPNOTSUPP);
3063
3064         /*
3065          * Scan the B-Tree to acquire blockmap addresses, then translate
3066          * to raw addresses.
3067          */
3068         lwkt_gettoken(&hmp->fs_token);
3069         hammer_simple_transaction(&trans, hmp);
3070 #if 0
3071         kprintf("bmap_beg %016llx ip->cache %p\n",
3072                 (long long)ap->a_loffset, ip->cache[1]);
3073 #endif
3074         hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
3075
3076         /*
3077          * Key range (begin and end inclusive) to scan.  Note that the key's
3078          * stored in the actual records represent BASE+LEN, not BASE.  The
3079          * first record containing bio_offset will have a key > bio_offset.
3080          */
3081         cursor.key_beg.localization = ip->obj_localization +
3082                                       HAMMER_LOCALIZE_MISC;
3083         cursor.key_beg.obj_id = ip->obj_id;
3084         cursor.key_beg.create_tid = 0;
3085         cursor.key_beg.delete_tid = 0;
3086         cursor.key_beg.obj_type = 0;
3087         if (ap->a_runb)
3088                 cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1;
3089         else
3090                 cursor.key_beg.key = ap->a_loffset + 1;
3091         if (cursor.key_beg.key < 0)
3092                 cursor.key_beg.key = 0;
3093         cursor.asof = ip->obj_asof;
3094         cursor.flags |= HAMMER_CURSOR_ASOF;
3095
3096         cursor.key_end = cursor.key_beg;
3097         KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
3098
3099         ran_end = ap->a_loffset + MAXPHYS;
3100         cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
3101         cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
3102         tmp64 = ran_end + MAXPHYS + 1;  /* work-around GCC-4 bug */
3103         if (tmp64 < ran_end)
3104                 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
3105         else
3106                 cursor.key_end.key = ran_end + MAXPHYS + 1;
3107
3108         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
3109
3110         error = hammer_ip_first(&cursor);
3111         base_offset = last_offset = 0;
3112         base_disk_offset = last_disk_offset = 0;
3113
3114         while (error == 0) {
3115                 /*
3116                  * Get the base file offset of the record.  The key for
3117                  * data records is (base + bytes) rather then (base).
3118                  *
3119                  * NOTE: rec_offset + rec_len may exceed the end-of-file.
3120                  * The extra bytes should be zero on-disk and the BMAP op
3121                  * should still be ok.
3122                  */
3123                 base = &cursor.leaf->base;
3124                 rec_offset = base->key - cursor.leaf->data_len;
3125                 rec_len    = cursor.leaf->data_len;
3126
3127                 /*
3128                  * Incorporate any cached truncation.
3129                  *
3130                  * NOTE: Modifications to rec_len based on synthesized
3131                  * truncation points remove the guarantee that any extended
3132                  * data on disk is zero (since the truncations may not have
3133                  * taken place on-media yet).
3134                  */
3135                 if (ip->flags & HAMMER_INODE_TRUNCATED) {
3136                         if (hammer_cursor_ondisk(&cursor) ||
3137                             cursor.iprec->flush_state == HAMMER_FST_FLUSH) {
3138                                 if (ip->trunc_off <= rec_offset)
3139                                         rec_len = 0;
3140                                 else if (ip->trunc_off < rec_offset + rec_len)
3141                                         rec_len = (int)(ip->trunc_off - rec_offset);
3142                         }
3143                 }
3144                 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
3145                         if (hammer_cursor_ondisk(&cursor)) {
3146                                 if (ip->sync_trunc_off <= rec_offset)
3147                                         rec_len = 0;
3148                                 else if (ip->sync_trunc_off < rec_offset + rec_len)
3149                                         rec_len = (int)(ip->sync_trunc_off - rec_offset);
3150                         }
3151                 }
3152
3153                 /*
3154                  * Accumulate information.  If we have hit a discontiguous
3155                  * block reset base_offset unless we are already beyond the
3156                  * requested offset.  If we are, that's it, we stop.
3157                  */
3158                 if (error)
3159                         break;
3160                 if (hammer_cursor_ondisk(&cursor)) {
3161                         disk_offset = cursor.leaf->data_offset;
3162                         if (rec_offset != last_offset ||
3163                             disk_offset != last_disk_offset) {
3164                                 if (rec_offset > ap->a_loffset)
3165                                         break;
3166                                 base_offset = rec_offset;
3167                                 base_disk_offset = disk_offset;
3168                         }
3169                         last_offset = rec_offset + rec_len;
3170                         last_disk_offset = disk_offset + rec_len;
3171
3172                         if (hammer_live_dedup)
3173                                 hammer_dedup_cache_add(ip, cursor.leaf);
3174                 }
3175
3176                 error = hammer_ip_next(&cursor);
3177         }
3178
3179 #if 0
3180         kprintf("BMAP %016llx:  %016llx - %016llx\n",
3181                 (long long)ap->a_loffset,
3182                 (long long)base_offset,
3183                 (long long)last_offset);
3184         kprintf("BMAP %16s:  %016llx - %016llx\n", "",
3185                 (long long)base_disk_offset,
3186                 (long long)last_disk_offset);
3187 #endif
3188
3189         if (cursor.node) {
3190                 hammer_cache_node(&ip->cache[1], cursor.node);
3191 #if 0
3192                 kprintf("bmap_end2 %016llx ip->cache %p\n",
3193                         (long long)ap->a_loffset, ip->cache[1]);
3194 #endif
3195         }
3196         hammer_done_cursor(&cursor);
3197         hammer_done_transaction(&trans);
3198         lwkt_reltoken(&hmp->fs_token);
3199
3200         /*
3201          * If we couldn't find any records or the records we did find were
3202          * all behind the requested offset, return failure.  A forward
3203          * truncation can leave a hole w/ no on-disk records.
3204          */
3205         if (last_offset == 0 || last_offset < ap->a_loffset)
3206                 return (EOPNOTSUPP);
3207
3208         /*
3209          * Figure out the block size at the requested offset and adjust
3210          * our limits so the cluster_read() does not create inappropriately
3211          * sized buffer cache buffers.
3212          */
3213         blksize = hammer_blocksize(ap->a_loffset);
3214         if (hammer_blocksize(base_offset) != blksize) {
3215                 base_offset = hammer_blockdemarc(base_offset, ap->a_loffset);
3216         }
3217         if (last_offset != ap->a_loffset &&
3218             hammer_blocksize(last_offset - 1) != blksize) {
3219                 last_offset = hammer_blockdemarc(ap->a_loffset,
3220                                                  last_offset - 1);
3221         }
3222
3223         /*
3224          * Returning EOPNOTSUPP simply prevents the direct-IO optimization
3225          * from occuring.
3226          */
3227         disk_offset = base_disk_offset + (ap->a_loffset - base_offset);
3228
3229         if ((disk_offset & HAMMER_OFF_ZONE_MASK) != HAMMER_ZONE_LARGE_DATA) {
3230                 /*
3231                  * Only large-data zones can be direct-IOd
3232                  */
3233                 error = EOPNOTSUPP;
3234         } else if ((disk_offset & HAMMER_BUFMASK) ||
3235                    (last_offset - ap->a_loffset) < blksize) {
3236                 /*
3237                  * doffsetp is not aligned or the forward run size does
3238                  * not cover a whole buffer, disallow the direct I/O.
3239                  */
3240                 error = EOPNOTSUPP;
3241         } else {
3242                 /*
3243                  * We're good.
3244                  */
3245                 *ap->a_doffsetp = disk_offset;
3246                 if (ap->a_runb) {
3247                         *ap->a_runb = ap->a_loffset - base_offset;
3248                         KKASSERT(*ap->a_runb >= 0);
3249                 }
3250                 if (ap->a_runp) {
3251                         *ap->a_runp = last_offset - ap->a_loffset;
3252                         KKASSERT(*ap->a_runp >= 0);
3253                 }
3254                 error = 0;
3255         }
3256         return(error);
3257 }
3258
3259 /*
3260  * Write to a regular file.   Because this is a strategy call the OS is
3261  * trying to actually get data onto the media.
3262  */
3263 static
3264 int
3265 hammer_vop_strategy_write(struct vop_strategy_args *ap)
3266 {
3267         hammer_record_t record;
3268         hammer_mount_t hmp;
3269         hammer_inode_t ip;
3270         struct bio *bio;
3271         struct buf *bp;
3272         int blksize __debugvar;
3273         int bytes;
3274         int error;
3275
3276         bio = ap->a_bio;
3277         bp = bio->bio_buf;
3278         ip = ap->a_vp->v_data;
3279         hmp = ip->hmp;
3280
3281         blksize = hammer_blocksize(bio->bio_offset);
3282         KKASSERT(bp->b_bufsize == blksize);
3283
3284         if (ip->flags & HAMMER_INODE_RO) {
3285                 bp->b_error = EROFS;
3286                 bp->b_flags |= B_ERROR;
3287                 biodone(ap->a_bio);
3288                 return(EROFS);
3289         }
3290
3291         lwkt_gettoken(&hmp->fs_token);
3292
3293         /*
3294          * Disallow swapcache operation on the vnode buffer if double
3295          * buffering is enabled, the swapcache will get the data via
3296          * the block device buffer.
3297          */
3298         if (hammer_double_buffer)
3299                 bp->b_flags |= B_NOTMETA;
3300
3301         /*
3302          * Interlock with inode destruction (no in-kernel or directory
3303          * topology visibility).  If we queue new IO while trying to
3304          * destroy the inode we can deadlock the vtrunc call in
3305          * hammer_inode_unloadable_check().
3306          *
3307          * Besides, there's no point flushing a bp associated with an
3308          * inode that is being destroyed on-media and has no kernel
3309          * references.
3310          */
3311         if ((ip->flags | ip->sync_flags) &
3312             (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) {
3313                 bp->b_resid = 0;
3314                 biodone(ap->a_bio);
3315                 lwkt_reltoken(&hmp->fs_token);
3316                 return(0);
3317         }
3318
3319         /*
3320          * Reserve space and issue a direct-write from the front-end.
3321          * NOTE: The direct_io code will hammer_bread/bcopy smaller
3322          * allocations.
3323          *
3324          * An in-memory record will be installed to reference the storage
3325          * until the flusher can get to it.
3326          *
3327          * Since we own the high level bio the front-end will not try to
3328          * do a direct-read until the write completes.
3329          *
3330          * NOTE: The only time we do not reserve a full-sized buffers
3331          * worth of data is if the file is small.  We do not try to
3332          * allocate a fragment (from the small-data zone) at the end of
3333          * an otherwise large file as this can lead to wildly separated
3334          * data.
3335          */
3336         KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0);
3337         KKASSERT(bio->bio_offset < ip->ino_data.size);
3338         if (bio->bio_offset || ip->ino_data.size > HAMMER_BUFSIZE / 2)
3339                 bytes = bp->b_bufsize;
3340         else
3341                 bytes = ((int)ip->ino_data.size + 15) & ~15;
3342
3343         record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data,
3344                                     bytes, &error);
3345
3346         /*
3347          * B_VFSFLAG1 indicates that a REDO_WRITE entry was generated
3348          * in hammer_vop_write().  We must flag the record so the proper
3349          * REDO_TERM_WRITE entry is generated during the flush.
3350          */
3351         if (record) {
3352                 if (bp->b_flags & B_VFSFLAG1) {
3353                         record->flags |= HAMMER_RECF_REDO;
3354                         bp->b_flags &= ~B_VFSFLAG1;
3355                 }
3356                 if (record->flags & HAMMER_RECF_DEDUPED) {
3357                         bp->b_resid = 0;
3358                         hammer_ip_replace_bulk(hmp, record);
3359                         biodone(ap->a_bio);
3360                 } else {
3361                         hammer_io_direct_write(hmp, bio, record);
3362                 }
3363                 if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs)
3364                         hammer_flush_inode(ip, 0);
3365         } else {
3366                 bp->b_bio2.bio_offset = NOOFFSET;
3367                 bp->b_error = error;
3368                 bp->b_flags |= B_ERROR;
3369                 biodone(ap->a_bio);
3370         }
3371         lwkt_reltoken(&hmp->fs_token);
3372         return(error);
3373 }
3374
3375 /*
3376  * dounlink - disconnect a directory entry
3377  *
3378  * XXX whiteout support not really in yet
3379  */
3380 static int
3381 hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch,
3382                 struct vnode *dvp, struct ucred *cred,
3383                 int flags, int isdir)
3384 {
3385         struct namecache *ncp;
3386         hammer_inode_t dip;
3387         hammer_inode_t ip;
3388         hammer_mount_t hmp;
3389         struct hammer_cursor cursor;
3390         int64_t namekey;
3391         u_int32_t max_iterations;
3392         int nlen, error;
3393
3394         /*
3395          * Calculate the namekey and setup the key range for the scan.  This
3396          * works kinda like a chained hash table where the lower 32 bits
3397          * of the namekey synthesize the chain.
3398          *
3399          * The key range is inclusive of both key_beg and key_end.
3400          */
3401         dip = VTOI(dvp);
3402         ncp = nch->ncp;
3403         hmp = dip->hmp;
3404
3405         if (dip->flags & HAMMER_INODE_RO)
3406                 return (EROFS);
3407
3408         namekey = hammer_directory_namekey(dip, ncp->nc_name, ncp->nc_nlen,
3409                                            &max_iterations);
3410 retry:
3411         hammer_init_cursor(trans, &cursor, &dip->cache[1], dip);
3412         cursor.key_beg.localization = dip->obj_localization +
3413                                       hammer_dir_localization(dip);
3414         cursor.key_beg.obj_id = dip->obj_id;
3415         cursor.key_beg.key = namekey;
3416         cursor.key_beg.create_tid = 0;
3417         cursor.key_beg.delete_tid = 0;
3418         cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
3419         cursor.key_beg.obj_type = 0;
3420
3421         cursor.key_end = cursor.key_beg;
3422         cursor.key_end.key += max_iterations;
3423         cursor.asof = dip->obj_asof;
3424         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
3425
3426         /*
3427          * Scan all matching records (the chain), locate the one matching
3428          * the requested path component.  info->last_error contains the
3429          * error code on search termination and could be 0, ENOENT, or
3430          * something else.
3431          *
3432          * The hammer_ip_*() functions merge in-memory records with on-disk
3433          * records for the purposes of the search.
3434          */
3435         error = hammer_ip_first(&cursor);
3436
3437         while (error == 0) {
3438                 error = hammer_ip_resolve_data(&cursor);
3439                 if (error)
3440                         break;
3441                 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
3442                 KKASSERT(nlen > 0);
3443                 if (ncp->nc_nlen == nlen &&
3444                     bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
3445                         break;
3446                 }
3447                 error = hammer_ip_next(&cursor);
3448         }
3449
3450         /*
3451          * If all is ok we have to get the inode so we can adjust nlinks.
3452          * To avoid a deadlock with the flusher we must release the inode
3453          * lock on the directory when acquiring the inode for the entry.
3454          *
3455          * If the target is a directory, it must be empty.
3456          */
3457         if (error == 0) {
3458                 hammer_unlock(&cursor.ip->lock);
3459                 ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id,
3460                                       hmp->asof,
3461                                       cursor.data->entry.localization,
3462                                       0, &error);
3463                 hammer_lock_sh(&cursor.ip->lock);
3464                 if (error == ENOENT) {
3465                         kprintf("HAMMER: WARNING: Removing "
3466                                 "dirent w/missing inode \"%s\"\n"
3467                                 "\tobj_id = %016llx\n",
3468                                 ncp->nc_name,
3469                                 (long long)cursor.data->entry.obj_id);
3470                         error = 0;
3471                 }
3472
3473                 /*
3474                  * If isdir >= 0 we validate that the entry is or is not a
3475                  * directory.  If isdir < 0 we don't care.
3476                  */
3477                 if (error == 0 && isdir >= 0 && ip) {
3478                         if (isdir &&
3479                             ip->ino_data.obj_type != HAMMER_OBJTYPE_DIRECTORY) {
3480                                 error = ENOTDIR;
3481                         } else if (isdir == 0 &&
3482                             ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY) {
3483                                 error = EISDIR;
3484                         }
3485                 }
3486
3487                 /*
3488                  * If we are trying to remove a directory the directory must
3489                  * be empty.
3490                  *
3491                  * The check directory code can loop and deadlock/retry.  Our
3492                  * own cursor's node locks must be released to avoid a 3-way
3493                  * deadlock with the flusher if the check directory code
3494                  * blocks.
3495                  *
3496                  * If any changes whatsoever have been made to the cursor
3497                  * set EDEADLK and retry.
3498                  *
3499                  * WARNING: See warnings in hammer_unlock_cursor()
3500                  *          function.
3501                  */
3502                 if (error == 0 && ip && ip->ino_data.obj_type ==
3503                                         HAMMER_OBJTYPE_DIRECTORY) {
3504                         hammer_unlock_cursor(&cursor);
3505                         error = hammer_ip_check_directory_empty(trans, ip);
3506                         hammer_lock_cursor(&cursor);
3507                         if (cursor.flags & HAMMER_CURSOR_RETEST) {
3508                                 kprintf("HAMMER: Warning: avoided deadlock "
3509                                         "on rmdir '%s'\n",
3510                                         ncp->nc_name);
3511                                 error = EDEADLK;
3512                         }
3513                 }
3514
3515                 /*
3516                  * Delete the directory entry.
3517                  *
3518                  * WARNING: hammer_ip_del_directory() may have to terminate
3519                  * the cursor to avoid a deadlock.  It is ok to call
3520                  * hammer_done_cursor() twice.
3521                  */
3522                 if (error == 0) {
3523                         error = hammer_ip_del_directory(trans, &cursor,
3524                                                         dip, ip);
3525                 }
3526                 hammer_done_cursor(&cursor);
3527                 if (error == 0) {
3528                         /*
3529                          * Tell the namecache that we are now unlinked.
3530                          */
3531                         cache_unlink(nch);
3532
3533                         /*
3534                          * NOTE: ip->vp, if non-NULL, cannot be directly
3535                          *       referenced without formally acquiring the
3536                          *       vp since the vp might have zero refs on it,
3537                          *       or in the middle of a reclaim, etc.
3538                          *
3539                          * NOTE: The cache_setunresolved() can rip the vp
3540                          *       out from under us since the vp may not have
3541                          *       any refs, in which case ip->vp will be NULL
3542                          *       from the outset.
3543                          */
3544                         while (ip && ip->vp) {
3545                                 struct vnode *vp;
3546
3547                                 error = hammer_get_vnode(ip, &vp);
3548                                 if (error == 0 && vp) {
3549                                         vn_unlock(vp);
3550                                         hammer_knote(ip->vp, NOTE_DELETE);
3551 #if 0
3552                                         /*
3553                                          * Don't do this, it can deadlock
3554                                          * on concurrent rm's of hardlinks.
3555                                          * Shouldn't be needed any more.
3556                                          */
3557                                         cache_inval_vp(ip->vp, CINV_DESTROY);
3558 #endif
3559                                         vrele(vp);
3560                                         break;
3561                                 }
3562                                 kprintf("Debug: HAMMER ip/vp race1 avoided\n");
3563                         }
3564                 }
3565                 if (ip)
3566                         hammer_rel_inode(ip, 0);
3567         } else {
3568                 hammer_done_cursor(&cursor);
3569         }
3570         if (error == EDEADLK)
3571                 goto retry;
3572
3573         return (error);
3574 }
3575
3576 /************************************************************************
3577  *                          FIFO AND SPECFS OPS                         *
3578  ************************************************************************
3579  *
3580  */
3581 static int
3582 hammer_vop_fifoclose (struct vop_close_args *ap)
3583 {
3584         /* XXX update itimes */
3585         return (VOCALL(&fifo_vnode_vops, &ap->a_head));
3586 }
3587
3588 static int
3589 hammer_vop_fiforead (struct vop_read_args *ap)
3590 {
3591         int error;
3592
3593         error = VOCALL(&fifo_vnode_vops, &ap->a_head);
3594         /* XXX update access time */
3595         return (error);
3596 }
3597
3598 static int
3599 hammer_vop_fifowrite (struct vop_write_args *ap)
3600 {
3601         int error;
3602
3603         error = VOCALL(&fifo_vnode_vops, &ap->a_head);
3604         /* XXX update access time */
3605         return (error);
3606 }
3607
3608 static
3609 int
3610 hammer_vop_fifokqfilter(struct vop_kqfilter_args *ap)
3611 {
3612         int error;
3613
3614         error = VOCALL(&fifo_vnode_vops, &ap->a_head);
3615         if (error)
3616                 error = hammer_vop_kqfilter(ap);
3617         return(error);
3618 }
3619
3620 /************************************************************************
3621  *                          KQFILTER OPS                                *
3622  ************************************************************************
3623  *
3624  */
3625 static void filt_hammerdetach(struct knote *kn);
3626 static int filt_hammerread(struct knote *kn, long hint);
3627 static int filt_hammerwrite(struct knote *kn, long hint);
3628 static int filt_hammervnode(struct knote *kn, long hint);
3629
3630 static struct filterops hammerread_filtops =
3631         { FILTEROP_ISFD | FILTEROP_MPSAFE,
3632           NULL, filt_hammerdetach, filt_hammerread };
3633 static struct filterops hammerwrite_filtops =
3634         { FILTEROP_ISFD | FILTEROP_MPSAFE,
3635           NULL, filt_hammerdetach, filt_hammerwrite };
3636 static struct filterops hammervnode_filtops =
3637         { FILTEROP_ISFD | FILTEROP_MPSAFE,
3638           NULL, filt_hammerdetach, filt_hammervnode };
3639
3640 static
3641 int
3642 hammer_vop_kqfilter(struct vop_kqfilter_args *ap)
3643 {
3644         struct vnode *vp = ap->a_vp;
3645         struct knote *kn = ap->a_kn;
3646
3647         switch (kn->kn_filter) {
3648         case EVFILT_READ:
3649                 kn->kn_fop = &hammerread_filtops;
3650                 break;
3651         case EVFILT_WRITE:
3652                 kn->kn_fop = &hammerwrite_filtops;
3653                 break;
3654         case EVFILT_VNODE:
3655                 kn->kn_fop = &hammervnode_filtops;
3656                 break;
3657         default:
3658                 return (EOPNOTSUPP);
3659         }
3660
3661         kn->kn_hook = (caddr_t)vp;
3662
3663         knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
3664
3665         return(0);
3666 }
3667
3668 static void
3669 filt_hammerdetach(struct knote *kn)
3670 {
3671         struct vnode *vp = (void *)kn->kn_hook;
3672
3673         knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
3674 }
3675
3676 static int
3677 filt_hammerread(struct knote *kn, long hint)
3678 {
3679         struct vnode *vp = (void *)kn->kn_hook;
3680         hammer_inode_t ip = VTOI(vp);
3681         hammer_mount_t hmp = ip->hmp;
3682         off_t off;
3683
3684         if (hint == NOTE_REVOKE) {
3685                 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT);
3686                 return(1);
3687         }
3688         lwkt_gettoken(&hmp->fs_token);  /* XXX use per-ip-token */
3689         off = ip->ino_data.size - kn->kn_fp->f_offset;
3690         kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX;
3691         lwkt_reltoken(&hmp->fs_token);
3692         if (kn->kn_sfflags & NOTE_OLDAPI)
3693                 return(1);
3694         return (kn->kn_data != 0);
3695 }
3696
3697 static int
3698 filt_hammerwrite(struct knote *kn, long hint)
3699 {
3700         if (hint == NOTE_REVOKE)
3701                 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT);
3702         kn->kn_data = 0;
3703         return (1);
3704 }
3705
3706 static int
3707 filt_hammervnode(struct knote *kn, long hint)
3708 {
3709         if (kn->kn_sfflags & hint)
3710                 kn->kn_fflags |= hint;
3711         if (hint == NOTE_REVOKE) {
3712                 kn->kn_flags |= (EV_EOF | EV_NODATA);
3713                 return (1);
3714         }
3715         return (kn->kn_fflags != 0);
3716 }
3717