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  * $DragonFly: src/sys/vfs/hammer/hammer_vnops.c,v 1.102 2008/10/16 17:24:16 dillon Exp $
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/kernel.h>
  40 #include <sys/fcntl.h>
  41 #include <sys/namecache.h>
  42 #include <sys/vnode.h>
  43 #include <sys/lockf.h>
  44 #include <sys/event.h>
  45 #include <sys/stat.h>
  46 #include <sys/dirent.h>
  47 #include <sys/file.h>
  48 #include <vm/vm_extern.h>
  49 #include <vfs/fifofs/fifo.h>
  50
  51 #include <sys/mplock2.h>
  52
  53 #include "hammer.h"
  54
  55 /*
  56  * USERFS VNOPS
  57  */
  58 /*static int hammer_vop_vnoperate(struct vop_generic_args *);*/
  59 static int hammer_vop_fsync(struct vop_fsync_args *);
  60 static int hammer_vop_read(struct vop_read_args *);
  61 static int hammer_vop_write(struct vop_write_args *);
  62 static int hammer_vop_access(struct vop_access_args *);
  63 static int hammer_vop_advlock(struct vop_advlock_args *);
  64 static int hammer_vop_close(struct vop_close_args *);
  65 static int hammer_vop_ncreate(struct vop_ncreate_args *);
  66 static int hammer_vop_getattr(struct vop_getattr_args *);
  67 static int hammer_vop_nresolve(struct vop_nresolve_args *);
  68 static int hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *);
  69 static int hammer_vop_nlink(struct vop_nlink_args *);
  70 static int hammer_vop_nmkdir(struct vop_nmkdir_args *);
  71 static int hammer_vop_nmknod(struct vop_nmknod_args *);
  72 static int hammer_vop_open(struct vop_open_args *);
  73 static int hammer_vop_print(struct vop_print_args *);
  74 static int hammer_vop_readdir(struct vop_readdir_args *);
  75 static int hammer_vop_readlink(struct vop_readlink_args *);
  76 static int hammer_vop_nremove(struct vop_nremove_args *);
  77 static int hammer_vop_nrename(struct vop_nrename_args *);
  78 static int hammer_vop_nrmdir(struct vop_nrmdir_args *);
  79 static int hammer_vop_markatime(struct vop_markatime_args *);
  80 static int hammer_vop_setattr(struct vop_setattr_args *);
  81 static int hammer_vop_strategy(struct vop_strategy_args *);
  82 static int hammer_vop_bmap(struct vop_bmap_args *ap);
  83 static int hammer_vop_nsymlink(struct vop_nsymlink_args *);
  84 static int hammer_vop_nwhiteout(struct vop_nwhiteout_args *);
  85 static int hammer_vop_ioctl(struct vop_ioctl_args *);
  86 static int hammer_vop_mountctl(struct vop_mountctl_args *);
  87 static int hammer_vop_kqfilter (struct vop_kqfilter_args *);
  88
  89 static int hammer_vop_fifoclose (struct vop_close_args *);
  90 static int hammer_vop_fiforead (struct vop_read_args *);
  91 static int hammer_vop_fifowrite (struct vop_write_args *);
  92 static int hammer_vop_fifokqfilter (struct vop_kqfilter_args *);
  93
  94 struct vop_ops hammer_vnode_vops = {
  95         .vop_default =          vop_defaultop,
  96         .vop_fsync =            hammer_vop_fsync,
  97         .vop_getpages =         vop_stdgetpages,
  98         .vop_putpages =         vop_stdputpages,
  99         .vop_read =             hammer_vop_read,
 100         .vop_write =            hammer_vop_write,
 101         .vop_access =           hammer_vop_access,
 102         .vop_advlock =          hammer_vop_advlock,
 103         .vop_close =            hammer_vop_close,
 104         .vop_ncreate =          hammer_vop_ncreate,
 105         .vop_getattr =          hammer_vop_getattr,
 106         .vop_inactive =         hammer_vop_inactive,
 107         .vop_reclaim =          hammer_vop_reclaim,
 108         .vop_nresolve =         hammer_vop_nresolve,
 109         .vop_nlookupdotdot =    hammer_vop_nlookupdotdot,
 110         .vop_nlink =            hammer_vop_nlink,
 111         .vop_nmkdir =           hammer_vop_nmkdir,
 112         .vop_nmknod =           hammer_vop_nmknod,
 113         .vop_open =             hammer_vop_open,
 114         .vop_pathconf =         vop_stdpathconf,
 115         .vop_print =            hammer_vop_print,
 116         .vop_readdir =          hammer_vop_readdir,
 117         .vop_readlink =         hammer_vop_readlink,
 118         .vop_nremove =          hammer_vop_nremove,
 119         .vop_nrename =          hammer_vop_nrename,
 120         .vop_nrmdir =           hammer_vop_nrmdir,
 121         .vop_markatime =        hammer_vop_markatime,
 122         .vop_setattr =          hammer_vop_setattr,
 123         .vop_bmap =             hammer_vop_bmap,
 124         .vop_strategy =         hammer_vop_strategy,
 125         .vop_nsymlink =         hammer_vop_nsymlink,
 126         .vop_nwhiteout =        hammer_vop_nwhiteout,
 127         .vop_ioctl =            hammer_vop_ioctl,
 128         .vop_mountctl =         hammer_vop_mountctl,
 129         .vop_kqfilter =         hammer_vop_kqfilter
 130 };
 131
 132 struct vop_ops hammer_spec_vops = {
 133         .vop_default =          vop_defaultop,
 134         .vop_fsync =            hammer_vop_fsync,
 135         .vop_read =             vop_stdnoread,
 136         .vop_write =            vop_stdnowrite,
 137         .vop_access =           hammer_vop_access,
 138         .vop_close =            hammer_vop_close,
 139         .vop_markatime =        hammer_vop_markatime,
 140         .vop_getattr =          hammer_vop_getattr,
 141         .vop_inactive =         hammer_vop_inactive,
 142         .vop_reclaim =          hammer_vop_reclaim,
 143         .vop_setattr =          hammer_vop_setattr
 144 };
 145
 146 struct vop_ops hammer_fifo_vops = {
 147         .vop_default =          fifo_vnoperate,
 148         .vop_fsync =            hammer_vop_fsync,
 149         .vop_read =             hammer_vop_fiforead,
 150         .vop_write =            hammer_vop_fifowrite,
 151         .vop_access =           hammer_vop_access,
 152         .vop_close =            hammer_vop_fifoclose,
 153         .vop_markatime =        hammer_vop_markatime,
 154         .vop_getattr =          hammer_vop_getattr,
 155         .vop_inactive =         hammer_vop_inactive,
 156         .vop_reclaim =          hammer_vop_reclaim,
 157         .vop_setattr =          hammer_vop_setattr,
 158         .vop_kqfilter =         hammer_vop_fifokqfilter
 159 };
 160
 161 static __inline
 162 void
 163 hammer_knote(struct vnode *vp, int flags)
 164 {
 165         if (flags)
 166                 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags);
 167 }
 168
 169 #ifdef DEBUG_TRUNCATE
 170 struct hammer_inode *HammerTruncIp;
 171 #endif
 172
 173 static int hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch,
 174                            struct vnode *dvp, struct ucred *cred,
 175                            int flags, int isdir);
 176 static int hammer_vop_strategy_read(struct vop_strategy_args *ap);
 177 static int hammer_vop_strategy_write(struct vop_strategy_args *ap);
 178
 179 #if 0
 180 static
 181 int
 182 hammer_vop_vnoperate(struct vop_generic_args *)
 183 {
 184         return (VOCALL(&hammer_vnode_vops, ap));
 185 }
 186 #endif
 187
 188 /*
 189  * hammer_vop_fsync { vp, waitfor }
 190  *
 191  * fsync() an inode to disk and wait for it to be completely committed
 192  * such that the information would not be undone if a crash occured after
 193  * return.
 194  *
 195  * NOTE: HAMMER's fsync()'s are going to remain expensive until we implement
 196  *       a REDO log.  A sysctl is provided to relax HAMMER's fsync()
 197  *       operation.
 198  *
 199  *       Ultimately the combination of a REDO log and use of fast storage
 200  *       to front-end cluster caches will make fsync fast, but it aint
 201  *       here yet.  And, in anycase, we need real transactional
 202  *       all-or-nothing features which are not restricted to a single file.
 203  */
 204 static
 205 int
 206 hammer_vop_fsync(struct vop_fsync_args *ap)
 207 {
 208         hammer_inode_t ip = VTOI(ap->a_vp);
 209         hammer_mount_t hmp = ip->hmp;
 210         int waitfor = ap->a_waitfor;
 211         int mode;
 212
 213         lwkt_gettoken(&hmp->fs_token);
 214
 215         /*
 216          * Fsync rule relaxation (default is either full synchronous flush
 217          * or REDO semantics with synchronous flush).
 218          */
 219         if (ap->a_flags & VOP_FSYNC_SYSCALL) {
 220                 switch(hammer_fsync_mode) {
 221                 case 0:
 222 mode0:
 223                         /* no REDO, full synchronous flush */
 224                         goto skip;
 225                 case 1:
 226 mode1:
 227                         /* no REDO, full asynchronous flush */
 228                         if (waitfor == MNT_WAIT)
 229                                 waitfor = MNT_NOWAIT;
 230                         goto skip;
 231                 case 2:
 232                         /* REDO semantics, synchronous flush */
 233                         if (hmp->version < HAMMER_VOL_VERSION_FOUR)
 234                                 goto mode0;
 235                         mode = HAMMER_FLUSH_UNDOS_AUTO;
 236                         break;
 237                 case 3:
 238                         /* REDO semantics, relaxed asynchronous flush */
 239                         if (hmp->version < HAMMER_VOL_VERSION_FOUR)
 240                                 goto mode1;
 241                         mode = HAMMER_FLUSH_UNDOS_RELAXED;
 242                         if (waitfor == MNT_WAIT)
 243                                 waitfor = MNT_NOWAIT;
 244                         break;
 245                 case 4:
 246                         /* ignore the fsync() system call */
 247                         lwkt_reltoken(&hmp->fs_token);
 248                         return(0);
 249                 default:
 250                         /* we have to do something */
 251                         mode = HAMMER_FLUSH_UNDOS_RELAXED;
 252                         if (waitfor == MNT_WAIT)
 253                                 waitfor = MNT_NOWAIT;
 254                         break;
 255                 }
 256
 257                 /*
 258                  * Fast fsync only needs to flush the UNDO/REDO fifo if
 259                  * HAMMER_INODE_REDO is non-zero and the only modifications
 260                  * made to the file are write or write-extends.
 261                  */
 262                 if ((ip->flags & HAMMER_INODE_REDO) &&
 263                     (ip->flags & HAMMER_INODE_MODMASK_NOREDO) == 0
 264                 ) {
 265                         ++hammer_count_fsyncs;
 266                         hammer_flusher_flush_undos(hmp, mode);
 267                         ip->redo_count = 0;
 268                         lwkt_reltoken(&hmp->fs_token);
 269                         return(0);
 270                 }
 271
 272                 /*
 273                  * REDO is enabled by fsync(), the idea being we really only
 274                  * want to lay down REDO records when programs are using
 275                  * fsync() heavily.  The first fsync() on the file starts
 276                  * the gravy train going and later fsync()s keep it hot by
 277                  * resetting the redo_count.
 278                  *
 279                  * We weren't running REDOs before now so we have to fall
 280                  * through and do a full fsync of what we have.
 281                  */
 282                 if (hmp->version >= HAMMER_VOL_VERSION_FOUR &&
 283                     (hmp->flags & HAMMER_MOUNT_REDO_RECOVERY_RUN) == 0) {
 284                         ip->flags |= HAMMER_INODE_REDO;
 285                         ip->redo_count = 0;
 286                 }
 287         }
 288 skip:
 289
 290         /*
 291          * Do a full flush sequence.
 292          */
 293         ++hammer_count_fsyncs;
 294         vfsync(ap->a_vp, waitfor, 1, NULL, NULL);
 295         hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
 296         if (waitfor == MNT_WAIT) {
 297                 vn_unlock(ap->a_vp);
 298                 hammer_wait_inode(ip);
 299                 vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
 300         }
 301         lwkt_reltoken(&hmp->fs_token);
 302         return (ip->error);
 303 }
 304
 305 /*
 306  * hammer_vop_read { vp, uio, ioflag, cred }
 307  *
 308  * MPSAFE (for the cache safe does not require fs_token)
 309  */
 310 static
 311 int
 312 hammer_vop_read(struct vop_read_args *ap)
 313 {
 314         struct hammer_transaction trans;
 315         hammer_inode_t ip;
 316         hammer_mount_t hmp;
 317         off_t offset;
 318         struct buf *bp;
 319         struct uio *uio;
 320         int error;
 321         int n;
 322         int seqcount;
 323         int ioseqcount;
 324         int blksize;
 325         int bigread;
 326         int got_fstoken;
 327
 328         if (ap->a_vp->v_type != VREG)
 329                 return (EINVAL);
 330         ip = VTOI(ap->a_vp);
 331         hmp = ip->hmp;
 332         error = 0;
 333         uio = ap->a_uio;
 334
 335         /*
 336          * Allow the UIO's size to override the sequential heuristic.
 337          */
 338         blksize = hammer_blocksize(uio->uio_offset);
 339         seqcount = (uio->uio_resid + (BKVASIZE - 1)) / BKVASIZE;
 340         ioseqcount = (ap->a_ioflag >> 16);
 341         if (seqcount < ioseqcount)
 342                 seqcount = ioseqcount;
 343
 344         /*
 345          * If reading or writing a huge amount of data we have to break
 346          * atomicy and allow the operation to be interrupted by a signal
 347          * or it can DOS the machine.
 348          */
 349         bigread = (uio->uio_resid > 100 * 1024 * 1024);
 350         got_fstoken = 0;
 351
 352         /*
 353          * Access the data typically in HAMMER_BUFSIZE blocks via the
 354          * buffer cache, but HAMMER may use a variable block size based
 355          * on the offset.
 356          *
 357          * XXX Temporary hack, delay the start transaction while we remain
 358          *     MPSAFE.  NOTE: ino_data.size cannot change while vnode is
 359          *     locked-shared.
 360          */
 361         while (uio->uio_resid > 0 && uio->uio_offset < ip->ino_data.size) {
 362                 int64_t base_offset;
 363                 int64_t file_limit;
 364
 365                 blksize = hammer_blocksize(uio->uio_offset);
 366                 offset = (int)uio->uio_offset & (blksize - 1);
 367                 base_offset = uio->uio_offset - offset;
 368
 369                 if (bigread && (error = hammer_signal_check(ip->hmp)) != 0)
 370                         break;
 371
 372                 /*
 373                  * MPSAFE
 374                  */
 375                 bp = getcacheblk(ap->a_vp, base_offset);
 376                 if (bp) {
 377                         error = 0;
 378                         goto skip;
 379                 }
 380
 381                 /*
 382                  * MPUNSAFE
 383                  */
 384                 if (got_fstoken == 0) {
 385                         lwkt_gettoken(&hmp->fs_token);
 386                         got_fstoken = 1;
 387                         hammer_start_transaction(&trans, ip->hmp);
 388                 }
 389
 390                 if (hammer_cluster_enable) {
 391                         /*
 392                          * Use file_limit to prevent cluster_read() from
 393                          * creating buffers of the wrong block size past
 394                          * the demarc.
 395                          */
 396                         file_limit = ip->ino_data.size;
 397                         if (base_offset < HAMMER_XDEMARC &&
 398                             file_limit > HAMMER_XDEMARC) {
 399                                 file_limit = HAMMER_XDEMARC;
 400                         }
 401                         error = cluster_read(ap->a_vp,
 402                                              file_limit, base_offset,
 403                                              blksize, uio->uio_resid,
 404                                              seqcount * BKVASIZE, &bp);
 405                 } else {
 406                         error = bread(ap->a_vp, base_offset, blksize, &bp);
 407                 }
 408                 if (error) {
 409                         brelse(bp);
 410                         break;
 411                 }
 412 skip:
 413                 if ((hammer_debug_io & 0x0001) && (bp->b_flags & B_IODEBUG)) {
 414                         kprintf("doff %016jx read file %016jx@%016jx\n",
 415                                 (intmax_t)bp->b_bio2.bio_offset,
 416                                 (intmax_t)ip->obj_id,
 417                                 (intmax_t)bp->b_loffset);
 418                 }
 419                 bp->b_flags &= ~B_IODEBUG;
 420
 421                 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
 422                 n = blksize - offset;
 423                 if (n > uio->uio_resid)
 424                         n = uio->uio_resid;
 425                 if (n > ip->ino_data.size - uio->uio_offset)
 426                         n = (int)(ip->ino_data.size - uio->uio_offset);
 427                 error = uiomove((char *)bp->b_data + offset, n, uio);
 428
 429                 /* data has a lower priority then meta-data */
 430                 bp->b_flags |= B_AGE;
 431                 bqrelse(bp);
 432                 if (error)
 433                         break;
 434                 hammer_stats_file_read += n;
 435         }
 436
 437         /*
 438          * XXX only update the atime if we had to get the MP lock.
 439          * XXX hack hack hack, fixme.
 440          */
 441         if (got_fstoken) {
 442                 if ((ip->flags & HAMMER_INODE_RO) == 0 &&
 443                     (ip->hmp->mp->mnt_flag & MNT_NOATIME) == 0) {
 444                         ip->ino_data.atime = trans.time;
 445                         hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME);
 446                 }
 447                 hammer_done_transaction(&trans);
 448                 lwkt_reltoken(&hmp->fs_token);
 449         }
 450         return (error);
 451 }
 452
 453 /*
 454  * hammer_vop_write { vp, uio, ioflag, cred }
 455  */
 456 static
 457 int
 458 hammer_vop_write(struct vop_write_args *ap)
 459 {
 460         struct hammer_transaction trans;
 461         struct hammer_inode *ip;
 462         hammer_mount_t hmp;
 463         struct uio *uio;
 464         int offset;
 465         off_t base_offset;
 466         struct buf *bp;
 467         int kflags;
 468         int error;
 469         int n;
 470         int flags;
 471         int seqcount;
 472         int bigwrite;
 473
 474         if (ap->a_vp->v_type != VREG)
 475                 return (EINVAL);
 476         ip = VTOI(ap->a_vp);
 477         hmp = ip->hmp;
 478         error = 0;
 479         kflags = 0;
 480         seqcount = ap->a_ioflag >> 16;
 481
 482         if (ip->flags & HAMMER_INODE_RO)
 483                 return (EROFS);
 484
 485         /*
 486          * Create a transaction to cover the operations we perform.
 487          */
 488         lwkt_gettoken(&hmp->fs_token);
 489         hammer_start_transaction(&trans, hmp);
 490         uio = ap->a_uio;
 491
 492         /*
 493          * Check append mode
 494          */
 495         if (ap->a_ioflag & IO_APPEND)
 496                 uio->uio_offset = ip->ino_data.size;
 497
 498         /*
 499          * Check for illegal write offsets.  Valid range is 0...2^63-1.
 500          *
 501          * NOTE: the base_off assignment is required to work around what
 502          * I consider to be a GCC-4 optimization bug.
 503          */
 504         if (uio->uio_offset < 0) {
 505                 hammer_done_transaction(&trans);
 506                 lwkt_reltoken(&hmp->fs_token);
 507                 return (EFBIG);
 508         }
 509         base_offset = uio->uio_offset + uio->uio_resid; /* work around gcc-4 */
 510         if (uio->uio_resid > 0 && base_offset <= uio->uio_offset) {
 511                 hammer_done_transaction(&trans);
 512                 lwkt_reltoken(&hmp->fs_token);
 513                 return (EFBIG);
 514         }
 515
 516         /*
 517          * If reading or writing a huge amount of data we have to break
 518          * atomicy and allow the operation to be interrupted by a signal
 519          * or it can DOS the machine.
 520          *
 521          * Preset redo_count so we stop generating REDOs earlier if the
 522          * limit is exceeded.
 523          */
 524         bigwrite = (uio->uio_resid > 100 * 1024 * 1024);
 525         if ((ip->flags & HAMMER_INODE_REDO) &&
 526             ip->redo_count < hammer_limit_redo) {
 527                 ip->redo_count += uio->uio_resid;
 528         }
 529
 530         /*
 531          * Access the data typically in HAMMER_BUFSIZE blocks via the
 532          * buffer cache, but HAMMER may use a variable block size based
 533          * on the offset.
 534          */
 535         while (uio->uio_resid > 0) {
 536                 int fixsize = 0;
 537                 int blksize;
 538                 int blkmask;
 539                 int trivial;
 540                 int endofblk;
 541                 off_t nsize;
 542
 543                 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE)) != 0)
 544                         break;
 545                 if (bigwrite && (error = hammer_signal_check(hmp)) != 0)
 546                         break;
 547
 548                 blksize = hammer_blocksize(uio->uio_offset);
 549
 550                 /*
 551                  * Do not allow HAMMER to blow out the buffer cache.  Very
 552                  * large UIOs can lockout other processes due to bwillwrite()
 553                  * mechanics.
 554                  *
 555                  * The hammer inode is not locked during these operations.
 556                  * The vnode is locked which can interfere with the pageout
 557                  * daemon for non-UIO_NOCOPY writes but should not interfere
 558                  * with the buffer cache.  Even so, we cannot afford to
 559                  * allow the pageout daemon to build up too many dirty buffer
 560                  * cache buffers.
 561                  *
 562                  * Only call this if we aren't being recursively called from
 563                  * a virtual disk device (vn), else we may deadlock.
 564                  */
 565                 if ((ap->a_ioflag & IO_RECURSE) == 0)
 566                         bwillwrite(blksize);
 567
 568                 /*
 569                  * Control the number of pending records associated with
 570                  * this inode.  If too many have accumulated start a
 571                  * flush.  Try to maintain a pipeline with the flusher.
 572                  */
 573                 if (ip->rsv_recs >= hammer_limit_inode_recs) {
 574                         hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
 575                 }
 576                 if (ip->rsv_recs >= hammer_limit_inode_recs * 2) {
 577                         while (ip->rsv_recs >= hammer_limit_inode_recs) {
 578                                 tsleep(&ip->rsv_recs, 0, "hmrwww", hz);
 579                         }
 580                         hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
 581                 }
 582
 583 #if 0
 584                 /*
 585                  * Do not allow HAMMER to blow out system memory by
 586                  * accumulating too many records.   Records are so well
 587                  * decoupled from the buffer cache that it is possible
 588                  * for userland to push data out to the media via
 589                  * direct-write, but build up the records queued to the
 590                  * backend faster then the backend can flush them out.
 591                  * HAMMER has hit its write limit but the frontend has
 592                  * no pushback to slow it down.
 593                  */
 594                 if (hmp->rsv_recs > hammer_limit_recs / 2) {
 595                         /*
 596                          * Get the inode on the flush list
 597                          */
 598                         if (ip->rsv_recs >= 64)
 599                                 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
 600                         else if (ip->rsv_recs >= 16)
 601                                 hammer_flush_inode(ip, 0);
 602
 603                         /*
 604                          * Keep the flusher going if the system keeps
 605                          * queueing records.
 606                          */
 607                         delta = hmp->count_newrecords -
 608                                 hmp->last_newrecords;
 609                         if (delta < 0 || delta > hammer_limit_recs / 2) {
 610                                 hmp->last_newrecords = hmp->count_newrecords;
 611                                 hammer_sync_hmp(hmp, MNT_NOWAIT);
 612                         }
 613
 614                         /*
 615                          * If we have gotten behind start slowing
 616                          * down the writers.
 617                          */
 618                         delta = (hmp->rsv_recs - hammer_limit_recs) *
 619                                 hz / hammer_limit_recs;
 620                         if (delta > 0)
 621                                 tsleep(&trans, 0, "hmrslo", delta);
 622                 }
 623 #endif
 624
 625                 /*
 626                  * Calculate the blocksize at the current offset and figure
 627                  * out how much we can actually write.
 628                  */
 629                 blkmask = blksize - 1;
 630                 offset = (int)uio->uio_offset & blkmask;
 631                 base_offset = uio->uio_offset & ~(int64_t)blkmask;
 632                 n = blksize - offset;
 633                 if (n > uio->uio_resid) {
 634                         n = uio->uio_resid;
 635                         endofblk = 0;
 636                 } else {
 637                         endofblk = 1;
 638                 }
 639                 nsize = uio->uio_offset + n;
 640                 if (nsize > ip->ino_data.size) {
 641                         if (uio->uio_offset > ip->ino_data.size)
 642                                 trivial = 0;
 643                         else
 644                                 trivial = 1;
 645                         nvextendbuf(ap->a_vp,
 646                                     ip->ino_data.size,
 647                                     nsize,
 648                                     hammer_blocksize(ip->ino_data.size),
 649                                     hammer_blocksize(nsize),
 650                                     hammer_blockoff(ip->ino_data.size),
 651                                     hammer_blockoff(nsize),
 652                                     trivial);
 653                         fixsize = 1;
 654                         kflags |= NOTE_EXTEND;
 655                 }
 656
 657                 if (uio->uio_segflg == UIO_NOCOPY) {
 658                         /*
 659                          * Issuing a write with the same data backing the
 660                          * buffer.  Instantiate the buffer to collect the
 661                          * backing vm pages, then read-in any missing bits.
 662                          *
 663                          * This case is used by vop_stdputpages().
 664                          */
 665                         bp = getblk(ap->a_vp, base_offset,
 666                                     blksize, GETBLK_BHEAVY, 0);
 667                         if ((bp->b_flags & B_CACHE) == 0) {
 668                                 bqrelse(bp);
 669                                 error = bread(ap->a_vp, base_offset,
 670                                               blksize, &bp);
 671                         }
 672                 } else if (offset == 0 && uio->uio_resid >= blksize) {
 673                         /*
 674                          * Even though we are entirely overwriting the buffer
 675                          * we may still have to zero it out to avoid a
 676                          * mmap/write visibility issue.
 677                          */
 678                         bp = getblk(ap->a_vp, base_offset, blksize, GETBLK_BHEAVY, 0);
 679                         if ((bp->b_flags & B_CACHE) == 0)
 680                                 vfs_bio_clrbuf(bp);
 681                 } else if (base_offset >= ip->ino_data.size) {
 682                         /*
 683                          * If the base offset of the buffer is beyond the
 684                          * file EOF, we don't have to issue a read.
 685                          */
 686                         bp = getblk(ap->a_vp, base_offset,
 687                                     blksize, GETBLK_BHEAVY, 0);
 688                         vfs_bio_clrbuf(bp);
 689                 } else {
 690                         /*
 691                          * Partial overwrite, read in any missing bits then
 692                          * replace the portion being written.
 693                          */
 694                         error = bread(ap->a_vp, base_offset, blksize, &bp);
 695                         if (error == 0)
 696                                 bheavy(bp);
 697                 }
 698                 if (error == 0)
 699                         error = uiomove(bp->b_data + offset, n, uio);
 700
 701                 /*
 702                  * Generate REDO records if enabled and redo_count will not
 703                  * exceeded the limit.
 704                  *
 705                  * If redo_count exceeds the limit we stop generating records
 706                  * and clear HAMMER_INODE_REDO.  This will cause the next
 707                  * fsync() to do a full meta-data sync instead of just an
 708                  * UNDO/REDO fifo update.
 709                  *
 710                  * When clearing HAMMER_INODE_REDO any pre-existing REDOs
 711                  * will still be tracked.  The tracks will be terminated
 712                  * when the related meta-data (including possible data
 713                  * modifications which are not tracked via REDO) is
 714                  * flushed.
 715                  */
 716                 if ((ip->flags & HAMMER_INODE_REDO) && error == 0) {
 717                         if (ip->redo_count < hammer_limit_redo) {
 718                                 bp->b_flags |= B_VFSFLAG1;
 719                                 error = hammer_generate_redo(&trans, ip,
 720                                                      base_offset + offset,
 721                                                      HAMMER_REDO_WRITE,
 722                                                      bp->b_data + offset,
 723                                                      (size_t)n);
 724                         } else {
 725                                 ip->flags &= ~HAMMER_INODE_REDO;
 726                         }
 727                 }
 728
 729                 /*
 730                  * If we screwed up we have to undo any VM size changes we
 731                  * made.
 732                  */
 733                 if (error) {
 734                         brelse(bp);
 735                         if (fixsize) {
 736                                 nvtruncbuf(ap->a_vp, ip->ino_data.size,
 737                                           hammer_blocksize(ip->ino_data.size),
 738                                           hammer_blockoff(ip->ino_data.size));
 739                         }
 740                         break;
 741                 }
 742                 kflags |= NOTE_WRITE;
 743                 hammer_stats_file_write += n;
 744                 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
 745                 if (ip->ino_data.size < uio->uio_offset) {
 746                         ip->ino_data.size = uio->uio_offset;
 747                         flags = HAMMER_INODE_SDIRTY;
 748                 } else {
 749                         flags = 0;
 750                 }
 751                 ip->ino_data.mtime = trans.time;
 752                 flags |= HAMMER_INODE_MTIME | HAMMER_INODE_BUFS;
 753                 hammer_modify_inode(&trans, ip, flags);
 754
 755                 /*
 756                  * Once we dirty the buffer any cached zone-X offset
 757                  * becomes invalid.  HAMMER NOTE: no-history mode cannot
 758                  * allow overwriting over the same data sector unless
 759                  * we provide UNDOs for the old data, which we don't.
 760                  */
 761                 bp->b_bio2.bio_offset = NOOFFSET;
 762
 763                 /*
 764                  * Final buffer disposition.
 765                  *
 766                  * Because meta-data updates are deferred, HAMMER is
 767                  * especially sensitive to excessive bdwrite()s because
 768                  * the I/O stream is not broken up by disk reads.  So the
 769                  * buffer cache simply cannot keep up.
 770                  *
 771                  * WARNING!  blksize is variable.  cluster_write() is
 772                  *           expected to not blow up if it encounters
 773                  *           buffers that do not match the passed blksize.
 774                  *
 775                  * NOTE!  Hammer shouldn't need to bawrite()/cluster_write().
 776                  *        The ip->rsv_recs check should burst-flush the data.
 777                  *        If we queue it immediately the buf could be left
 778                  *        locked on the device queue for a very long time.
 779                  *
 780                  * NOTE!  To avoid degenerate stalls due to mismatched block
 781                  *        sizes we only honor IO_DIRECT on the write which
 782                  *        abuts the end of the buffer.  However, we must
 783                  *        honor IO_SYNC in case someone is silly enough to
 784                  *        configure a HAMMER file as swap, or when HAMMER
 785                  *        is serving NFS (for commits).  Ick ick.
 786                  */
 787                 bp->b_flags |= B_AGE;
 788                 if (ap->a_ioflag & IO_SYNC) {
 789                         bwrite(bp);
 790                 } else if ((ap->a_ioflag & IO_DIRECT) && endofblk) {
 791                         bawrite(bp);
 792                 } else {
 793 #if 0
 794                 if (offset + n == blksize) {
 795                         if (hammer_cluster_enable == 0 ||
 796                             (ap->a_vp->v_mount->mnt_flag & MNT_NOCLUSTERW)) {
 797                                 bawrite(bp);
 798                         } else {
 799                                 cluster_write(bp, ip->ino_data.size,
 800                                               blksize, seqcount);
 801                         }
 802                 } else {
 803 #endif
 804                         bdwrite(bp);
 805                 }
 806         }
 807         hammer_done_transaction(&trans);
 808         hammer_knote(ap->a_vp, kflags);
 809         lwkt_reltoken(&hmp->fs_token);
 810         return (error);
 811 }
 812
 813 /*
 814  * hammer_vop_access { vp, mode, cred }
 815  *
 816  * MPSAFE - does not require fs_token
 817  */
 818 static
 819 int
 820 hammer_vop_access(struct vop_access_args *ap)
 821 {
 822         struct hammer_inode *ip = VTOI(ap->a_vp);
 823         uid_t uid;
 824         gid_t gid;
 825         int error;
 826
 827         ++hammer_stats_file_iopsr;
 828         uid = hammer_to_unix_xid(&ip->ino_data.uid);
 829         gid = hammer_to_unix_xid(&ip->ino_data.gid);
 830
 831         error = vop_helper_access(ap, uid, gid, ip->ino_data.mode,
 832                                   ip->ino_data.uflags);
 833         return (error);
 834 }
 835
 836 /*
 837  * hammer_vop_advlock { vp, id, op, fl, flags }
 838  *
 839  * MPSAFE - does not require fs_token
 840  */
 841 static
 842 int
 843 hammer_vop_advlock(struct vop_advlock_args *ap)
 844 {
 845         hammer_inode_t ip = VTOI(ap->a_vp);
 846
 847         return (lf_advlock(ap, &ip->advlock, ip->ino_data.size));
 848 }
 849
 850 /*
 851  * hammer_vop_close { vp, fflag }
 852  *
 853  * We can only sync-on-close for normal closes.  XXX disabled for now.
 854  */
 855 static
 856 int
 857 hammer_vop_close(struct vop_close_args *ap)
 858 {
 859 #if 0
 860         struct vnode *vp = ap->a_vp;
 861         hammer_inode_t ip = VTOI(vp);
 862         int waitfor;
 863         if (ip->flags & (HAMMER_INODE_CLOSESYNC|HAMMER_INODE_CLOSEASYNC)) {
 864                 if (vn_islocked(vp) == LK_EXCLUSIVE &&
 865                     (vp->v_flag & (VINACTIVE|VRECLAIMED)) == 0) {
 866                         if (ip->flags & HAMMER_INODE_CLOSESYNC)
 867                                 waitfor = MNT_WAIT;
 868                         else
 869                                 waitfor = MNT_NOWAIT;
 870                         ip->flags &= ~(HAMMER_INODE_CLOSESYNC |
 871                                        HAMMER_INODE_CLOSEASYNC);
 872                         VOP_FSYNC(vp, MNT_NOWAIT, waitfor);
 873                 }
 874         }
 875 #endif
 876         return (vop_stdclose(ap));
 877 }
 878
 879 /*
 880  * hammer_vop_ncreate { nch, dvp, vpp, cred, vap }
 881  *
 882  * The operating system has already ensured that the directory entry
 883  * does not exist and done all appropriate namespace locking.
 884  */
 885 static
 886 int
 887 hammer_vop_ncreate(struct vop_ncreate_args *ap)
 888 {
 889         struct hammer_transaction trans;
 890         struct hammer_inode *dip;
 891         struct hammer_inode *nip;
 892         struct nchandle *nch;
 893         hammer_mount_t hmp;
 894         int error;
 895
 896         nch = ap->a_nch;
 897         dip = VTOI(ap->a_dvp);
 898         hmp = dip->hmp;
 899
 900         if (dip->flags & HAMMER_INODE_RO)
 901                 return (EROFS);
 902         if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
 903                 return (error);
 904
 905         /*
 906          * Create a transaction to cover the operations we perform.
 907          */
 908         lwkt_gettoken(&hmp->fs_token);
 909         hammer_start_transaction(&trans, hmp);
 910         ++hammer_stats_file_iopsw;
 911
 912         /*
 913          * Create a new filesystem object of the requested type.  The
 914          * returned inode will be referenced and shared-locked to prevent
 915          * it from being moved to the flusher.
 916          */
 917         error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
 918                                     dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
 919                                     NULL, &nip);
 920         if (error) {
 921                 hkprintf("hammer_create_inode error %d\n", error);
 922                 hammer_done_transaction(&trans);
 923                 *ap->a_vpp = NULL;
 924                 lwkt_reltoken(&hmp->fs_token);
 925                 return (error);
 926         }
 927
 928         /*
 929          * Add the new filesystem object to the directory.  This will also
 930          * bump the inode's link count.
 931          */
 932         error = hammer_ip_add_directory(&trans, dip,
 933                                         nch->ncp->nc_name, nch->ncp->nc_nlen,
 934                                         nip);
 935         if (error)
 936                 hkprintf("hammer_ip_add_directory error %d\n", error);
 937
 938         /*
 939          * Finish up.
 940          */
 941         if (error) {
 942                 hammer_rel_inode(nip, 0);
 943                 hammer_done_transaction(&trans);
 944                 *ap->a_vpp = NULL;
 945         } else {
 946                 error = hammer_get_vnode(nip, ap->a_vpp);
 947                 hammer_done_transaction(&trans);
 948                 hammer_rel_inode(nip, 0);
 949                 if (error == 0) {
 950                         cache_setunresolved(ap->a_nch);
 951                         cache_setvp(ap->a_nch, *ap->a_vpp);
 952                 }
 953                 hammer_knote(ap->a_dvp, NOTE_WRITE);
 954         }
 955         lwkt_reltoken(&hmp->fs_token);
 956         return (error);
 957 }
 958
 959 /*
 960  * hammer_vop_getattr { vp, vap }
 961  *
 962  * Retrieve an inode's attribute information.  When accessing inodes
 963  * historically we fake the atime field to ensure consistent results.
 964  * The atime field is stored in the B-Tree element and allowed to be
 965  * updated without cycling the element.
 966  *
 967  * MPSAFE - does not require fs_token
 968  */
 969 static
 970 int
 971 hammer_vop_getattr(struct vop_getattr_args *ap)
 972 {
 973         struct hammer_inode *ip = VTOI(ap->a_vp);
 974         struct vattr *vap = ap->a_vap;
 975
 976         /*
 977          * We want the fsid to be different when accessing a filesystem
 978          * with different as-of's so programs like diff don't think
 979          * the files are the same.
 980          *
 981          * We also want the fsid to be the same when comparing snapshots,
 982          * or when comparing mirrors (which might be backed by different
 983          * physical devices).  HAMMER fsids are based on the PFS's
 984          * shared_uuid field.
 985          *
 986          * XXX there is a chance of collision here.  The va_fsid reported
 987          * by stat is different from the more involved fsid used in the
 988          * mount structure.
 989          */
 990         ++hammer_stats_file_iopsr;
 991         hammer_lock_sh(&ip->lock);
 992         vap->va_fsid = ip->pfsm->fsid_udev ^ (u_int32_t)ip->obj_asof ^
 993                        (u_int32_t)(ip->obj_asof >> 32);
 994
 995         vap->va_fileid = ip->ino_leaf.base.obj_id;
 996         vap->va_mode = ip->ino_data.mode;
 997         vap->va_nlink = ip->ino_data.nlinks;
 998         vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid);
 999         vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid);
1000         vap->va_rmajor = 0;
1001         vap->va_rminor = 0;
1002         vap->va_size = ip->ino_data.size;
1003
1004         /*
1005          * Special case for @@PFS softlinks.  The actual size of the
1006          * expanded softlink is "@@0x%016llx:%05d" == 26 bytes.
1007          * or for MAX_TID is    "@@-1:%05d" == 10 bytes.
1008          */
1009         if (ip->ino_data.obj_type == HAMMER_OBJTYPE_SOFTLINK &&
1010             ip->ino_data.size == 10 &&
1011             ip->obj_asof == HAMMER_MAX_TID &&
1012             ip->obj_localization == 0 &&
1013             strncmp(ip->ino_data.ext.symlink, "@@PFS", 5) == 0) {
1014                     if (ip->pfsm->pfsd.mirror_flags & HAMMER_PFSD_SLAVE)
1015                             vap->va_size = 26;
1016                     else
1017                             vap->va_size = 10;
1018         }
1019
1020         /*
1021          * We must provide a consistent atime and mtime for snapshots
1022          * so people can do a 'tar cf - ... | md5' on them and get
1023          * consistent results.
1024          */
1025         if (ip->flags & HAMMER_INODE_RO) {
1026                 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_atime);
1027                 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_mtime);
1028         } else {
1029                 hammer_time_to_timespec(ip->ino_data.atime, &vap->va_atime);
1030                 hammer_time_to_timespec(ip->ino_data.mtime, &vap->va_mtime);
1031         }
1032         hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_ctime);
1033         vap->va_flags = ip->ino_data.uflags;
1034         vap->va_gen = 1;        /* hammer inums are unique for all time */
1035         vap->va_blocksize = HAMMER_BUFSIZE;
1036         if (ip->ino_data.size >= HAMMER_XDEMARC) {
1037                 vap->va_bytes = (ip->ino_data.size + HAMMER_XBUFMASK64) &
1038                                 ~HAMMER_XBUFMASK64;
1039         } else if (ip->ino_data.size > HAMMER_BUFSIZE / 2) {
1040                 vap->va_bytes = (ip->ino_data.size + HAMMER_BUFMASK64) &
1041                                 ~HAMMER_BUFMASK64;
1042         } else {
1043                 vap->va_bytes = (ip->ino_data.size + 15) & ~15;
1044         }
1045
1046         vap->va_type = hammer_get_vnode_type(ip->ino_data.obj_type);
1047         vap->va_filerev = 0;    /* XXX */
1048         vap->va_uid_uuid = ip->ino_data.uid;
1049         vap->va_gid_uuid = ip->ino_data.gid;
1050         vap->va_fsid_uuid = ip->hmp->fsid;
1051         vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID |
1052                           VA_FSID_UUID_VALID;
1053
1054         switch (ip->ino_data.obj_type) {
1055         case HAMMER_OBJTYPE_CDEV:
1056         case HAMMER_OBJTYPE_BDEV:
1057                 vap->va_rmajor = ip->ino_data.rmajor;
1058                 vap->va_rminor = ip->ino_data.rminor;
1059                 break;
1060         default:
1061                 break;
1062         }
1063         hammer_unlock(&ip->lock);
1064         return(0);
1065 }
1066
1067 /*
1068  * hammer_vop_nresolve { nch, dvp, cred }
1069  *
1070  * Locate the requested directory entry.
1071  */
1072 static
1073 int
1074 hammer_vop_nresolve(struct vop_nresolve_args *ap)
1075 {
1076         struct hammer_transaction trans;
1077         struct namecache *ncp;
1078         hammer_mount_t hmp;
1079         hammer_inode_t dip;
1080         hammer_inode_t ip;
1081         hammer_tid_t asof;
1082         struct hammer_cursor cursor;
1083         struct vnode *vp;
1084         int64_t namekey;
1085         int error;
1086         int i;
1087         int nlen;
1088         int flags;
1089         int ispfs;
1090         int64_t obj_id;
1091         u_int32_t localization;
1092         u_int32_t max_iterations;
1093
1094         /*
1095          * Misc initialization, plus handle as-of name extensions.  Look for
1096          * the '@@' extension.  Note that as-of files and directories cannot
1097          * be modified.
1098          */
1099         dip = VTOI(ap->a_dvp);
1100         ncp = ap->a_nch->ncp;
1101         asof = dip->obj_asof;
1102         localization = dip->obj_localization;   /* for code consistency */
1103         nlen = ncp->nc_nlen;
1104         flags = dip->flags & HAMMER_INODE_RO;
1105         ispfs = 0;
1106         hmp = dip->hmp;
1107
1108         lwkt_gettoken(&hmp->fs_token);
1109         hammer_simple_transaction(&trans, hmp);
1110         ++hammer_stats_file_iopsr;
1111
1112         for (i = 0; i < nlen; ++i) {
1113                 if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') {
1114                         error = hammer_str_to_tid(ncp->nc_name + i + 2,
1115                                                   &ispfs, &asof, &localization);
1116                         if (error != 0) {
1117                                 i = nlen;
1118                                 break;
1119                         }
1120                         if (asof != HAMMER_MAX_TID)
1121                                 flags |= HAMMER_INODE_RO;
1122                         break;
1123                 }
1124         }
1125         nlen = i;
1126
1127         /*
1128          * If this is a PFS softlink we dive into the PFS
1129          */
1130         if (ispfs && nlen == 0) {
1131                 ip = hammer_get_inode(&trans, dip, HAMMER_OBJID_ROOT,
1132                                       asof, localization,
1133                                       flags, &error);
1134                 if (error == 0) {
1135                         error = hammer_get_vnode(ip, &vp);
1136                         hammer_rel_inode(ip, 0);
1137                 } else {
1138                         vp = NULL;
1139                 }
1140                 if (error == 0) {
1141                         vn_unlock(vp);
1142                         cache_setvp(ap->a_nch, vp);
1143                         vrele(vp);
1144                 }
1145                 goto done;
1146         }
1147
1148         /*
1149          * If there is no path component the time extension is relative to dip.
1150          * e.g. "fubar/@@<snapshot>"
1151          *
1152          * "." is handled by the kernel, but ".@@<snapshot>" is not.
1153          * e.g. "fubar/.@@<snapshot>"
1154          *
1155          * ".." is handled by the kernel.  We do not currently handle
1156          * "..@<snapshot>".
1157          */
1158         if (nlen == 0 || (nlen == 1 && ncp->nc_name[0] == '.')) {
1159                 ip = hammer_get_inode(&trans, dip, dip->obj_id,
1160                                       asof, dip->obj_localization,
1161                                       flags, &error);
1162                 if (error == 0) {
1163                         error = hammer_get_vnode(ip, &vp);
1164                         hammer_rel_inode(ip, 0);
1165                 } else {
1166                         vp = NULL;
1167                 }
1168                 if (error == 0) {
1169                         vn_unlock(vp);
1170                         cache_setvp(ap->a_nch, vp);
1171                         vrele(vp);
1172                 }
1173                 goto done;
1174         }
1175
1176         /*
1177          * Calculate the namekey and setup the key range for the scan.  This
1178          * works kinda like a chained hash table where the lower 32 bits
1179          * of the namekey synthesize the chain.
1180          *
1181          * The key range is inclusive of both key_beg and key_end.
1182          */
1183         namekey = hammer_directory_namekey(dip, ncp->nc_name, nlen,
1184                                            &max_iterations);
1185
1186         error = hammer_init_cursor(&trans, &cursor, &dip->cache[1], dip);
1187         cursor.key_beg.localization = dip->obj_localization +
1188                                       hammer_dir_localization(dip);
1189         cursor.key_beg.obj_id = dip->obj_id;
1190         cursor.key_beg.key = namekey;
1191         cursor.key_beg.create_tid = 0;
1192         cursor.key_beg.delete_tid = 0;
1193         cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1194         cursor.key_beg.obj_type = 0;
1195
1196         cursor.key_end = cursor.key_beg;
1197         cursor.key_end.key += max_iterations;
1198         cursor.asof = asof;
1199         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1200
1201         /*
1202          * Scan all matching records (the chain), locate the one matching
1203          * the requested path component.
1204          *
1205          * The hammer_ip_*() functions merge in-memory records with on-disk
1206          * records for the purposes of the search.
1207          */
1208         obj_id = 0;
1209         localization = HAMMER_DEF_LOCALIZATION;
1210
1211         if (error == 0) {
1212                 error = hammer_ip_first(&cursor);
1213                 while (error == 0) {
1214                         error = hammer_ip_resolve_data(&cursor);
1215                         if (error)
1216                                 break;
1217                         if (nlen == cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF &&
1218                             bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
1219                                 obj_id = cursor.data->entry.obj_id;
1220                                 localization = cursor.data->entry.localization;
1221                                 break;
1222                         }
1223                         error = hammer_ip_next(&cursor);
1224                 }
1225         }
1226         hammer_done_cursor(&cursor);
1227
1228         /*
1229          * Lookup the obj_id.  This should always succeed.  If it does not
1230          * the filesystem may be damaged and we return a dummy inode.
1231          */
1232         if (error == 0) {
1233                 ip = hammer_get_inode(&trans, dip, obj_id,
1234                                       asof, localization,
1235                                       flags, &error);
1236                 if (error == ENOENT) {
1237                         kprintf("HAMMER: WARNING: Missing "
1238                                 "inode for dirent \"%s\"\n"
1239                                 "\tobj_id = %016llx, asof=%016llx, lo=%08x\n",
1240                                 ncp->nc_name,
1241                                 (long long)obj_id, (long long)asof,
1242                                 localization);
1243                         error = 0;
1244                         ip = hammer_get_dummy_inode(&trans, dip, obj_id,
1245                                                     asof, localization,
1246                                                     flags, &error);
1247                 }
1248                 if (error == 0) {
1249                         error = hammer_get_vnode(ip, &vp);
1250                         hammer_rel_inode(ip, 0);
1251                 } else {
1252                         vp = NULL;
1253                 }
1254                 if (error == 0) {
1255                         vn_unlock(vp);
1256                         cache_setvp(ap->a_nch, vp);
1257                         vrele(vp);
1258                 }
1259         } else if (error == ENOENT) {
1260                 cache_setvp(ap->a_nch, NULL);
1261         }
1262 done:
1263         hammer_done_transaction(&trans);
1264         lwkt_reltoken(&hmp->fs_token);
1265         return (error);
1266 }
1267
1268 /*
1269  * hammer_vop_nlookupdotdot { dvp, vpp, cred }
1270  *
1271  * Locate the parent directory of a directory vnode.
1272  *
1273  * dvp is referenced but not locked.  *vpp must be returned referenced and
1274  * locked.  A parent_obj_id of 0 does not necessarily indicate that we are
1275  * at the root, instead it could indicate that the directory we were in was
1276  * removed.
1277  *
1278  * NOTE: as-of sequences are not linked into the directory structure.  If
1279  * we are at the root with a different asof then the mount point, reload
1280  * the same directory with the mount point's asof.   I'm not sure what this
1281  * will do to NFS.  We encode ASOF stamps in NFS file handles so it might not
1282  * get confused, but it hasn't been tested.
1283  */
1284 static
1285 int
1286 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
1287 {
1288         struct hammer_transaction trans;
1289         struct hammer_inode *dip;
1290         struct hammer_inode *ip;
1291         hammer_mount_t hmp;
1292         int64_t parent_obj_id;
1293         u_int32_t parent_obj_localization;
1294         hammer_tid_t asof;
1295         int error;
1296
1297         dip = VTOI(ap->a_dvp);
1298         asof = dip->obj_asof;
1299         hmp = dip->hmp;
1300
1301         /*
1302          * Whos are parent?  This could be the root of a pseudo-filesystem
1303          * whos parent is in another localization domain.
1304          */
1305         lwkt_gettoken(&hmp->fs_token);
1306         parent_obj_id = dip->ino_data.parent_obj_id;
1307         if (dip->obj_id == HAMMER_OBJID_ROOT)
1308                 parent_obj_localization = dip->ino_data.ext.obj.parent_obj_localization;
1309         else
1310                 parent_obj_localization = dip->obj_localization;
1311
1312         if (parent_obj_id == 0) {
1313                 if (dip->obj_id == HAMMER_OBJID_ROOT &&
1314                    asof != hmp->asof) {
1315                         parent_obj_id = dip->obj_id;
1316                         asof = hmp->asof;
1317                         *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK);
1318                         ksnprintf(*ap->a_fakename, 19, "0x%016llx",
1319                                   (long long)dip->obj_asof);
1320                 } else {
1321                         *ap->a_vpp = NULL;
1322                         lwkt_reltoken(&hmp->fs_token);
1323                         return ENOENT;
1324                 }
1325         }
1326
1327         hammer_simple_transaction(&trans, hmp);
1328         ++hammer_stats_file_iopsr;
1329
1330         ip = hammer_get_inode(&trans, dip, parent_obj_id,
1331                               asof, parent_obj_localization,
1332                               dip->flags, &error);
1333         if (ip) {
1334                 error = hammer_get_vnode(ip, ap->a_vpp);
1335                 hammer_rel_inode(ip, 0);
1336         } else {
1337                 *ap->a_vpp = NULL;
1338         }
1339         hammer_done_transaction(&trans);
1340         lwkt_reltoken(&hmp->fs_token);
1341         return (error);
1342 }
1343
1344 /*
1345  * hammer_vop_nlink { nch, dvp, vp, cred }
1346  */
1347 static
1348 int
1349 hammer_vop_nlink(struct vop_nlink_args *ap)
1350 {
1351         struct hammer_transaction trans;
1352         struct hammer_inode *dip;
1353         struct hammer_inode *ip;
1354         struct nchandle *nch;
1355         hammer_mount_t hmp;
1356         int error;
1357
1358         if (ap->a_dvp->v_mount != ap->a_vp->v_mount)
1359                 return(EXDEV);
1360
1361         nch = ap->a_nch;
1362         dip = VTOI(ap->a_dvp);
1363         ip = VTOI(ap->a_vp);
1364         hmp = dip->hmp;
1365
1366         if (dip->obj_localization != ip->obj_localization)
1367                 return(EXDEV);
1368
1369         if (dip->flags & HAMMER_INODE_RO)
1370                 return (EROFS);
1371         if (ip->flags & HAMMER_INODE_RO)
1372                 return (EROFS);
1373         if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
1374                 return (error);
1375
1376         /*
1377          * Create a transaction to cover the operations we perform.
1378          */
1379         lwkt_gettoken(&hmp->fs_token);
1380         hammer_start_transaction(&trans, hmp);
1381         ++hammer_stats_file_iopsw;
1382
1383         /*
1384          * Add the filesystem object to the directory.  Note that neither
1385          * dip nor ip are referenced or locked, but their vnodes are
1386          * referenced.  This function will bump the inode's link count.
1387          */
1388         error = hammer_ip_add_directory(&trans, dip,
1389                                         nch->ncp->nc_name, nch->ncp->nc_nlen,
1390                                         ip);
1391
1392         /*
1393          * Finish up.
1394          */
1395         if (error == 0) {
1396                 cache_setunresolved(nch);
1397                 cache_setvp(nch, ap->a_vp);
1398         }
1399         hammer_done_transaction(&trans);
1400         hammer_knote(ap->a_vp, NOTE_LINK);
1401         hammer_knote(ap->a_dvp, NOTE_WRITE);
1402         lwkt_reltoken(&hmp->fs_token);
1403         return (error);
1404 }
1405
1406 /*
1407  * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap }
1408  *
1409  * The operating system has already ensured that the directory entry
1410  * does not exist and done all appropriate namespace locking.
1411  */
1412 static
1413 int
1414 hammer_vop_nmkdir(struct vop_nmkdir_args *ap)
1415 {
1416         struct hammer_transaction trans;
1417         struct hammer_inode *dip;
1418         struct hammer_inode *nip;
1419         struct nchandle *nch;
1420         hammer_mount_t hmp;
1421         int error;
1422
1423         nch = ap->a_nch;
1424         dip = VTOI(ap->a_dvp);
1425         hmp = dip->hmp;
1426
1427         if (dip->flags & HAMMER_INODE_RO)
1428                 return (EROFS);
1429         if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
1430                 return (error);
1431
1432         /*
1433          * Create a transaction to cover the operations we perform.
1434          */
1435         lwkt_gettoken(&hmp->fs_token);
1436         hammer_start_transaction(&trans, hmp);
1437         ++hammer_stats_file_iopsw;
1438
1439         /*
1440          * Create a new filesystem object of the requested type.  The
1441          * returned inode will be referenced but not locked.
1442          */
1443         error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1444                                     dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
1445                                     NULL, &nip);
1446         if (error) {
1447                 hkprintf("hammer_mkdir error %d\n", error);
1448                 hammer_done_transaction(&trans);
1449                 *ap->a_vpp = NULL;
1450                 lwkt_reltoken(&hmp->fs_token);
1451                 return (error);
1452         }
1453         /*
1454          * Add the new filesystem object to the directory.  This will also
1455          * bump the inode's link count.
1456          */
1457         error = hammer_ip_add_directory(&trans, dip,
1458                                         nch->ncp->nc_name, nch->ncp->nc_nlen,
1459                                         nip);
1460         if (error)
1461                 hkprintf("hammer_mkdir (add) error %d\n", error);
1462
1463         /*
1464          * Finish up.
1465          */
1466         if (error) {
1467                 hammer_rel_inode(nip, 0);
1468                 *ap->a_vpp = NULL;
1469         } else {
1470                 error = hammer_get_vnode(nip, ap->a_vpp);
1471                 hammer_rel_inode(nip, 0);
1472                 if (error == 0) {
1473                         cache_setunresolved(ap->a_nch);
1474                         cache_setvp(ap->a_nch, *ap->a_vpp);
1475                 }
1476         }
1477         hammer_done_transaction(&trans);
1478         if (error == 0)
1479                 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
1480         lwkt_reltoken(&hmp->fs_token);
1481         return (error);
1482 }
1483
1484 /*
1485  * hammer_vop_nmknod { nch, dvp, vpp, cred, vap }
1486  *
1487  * The operating system has already ensured that the directory entry
1488  * does not exist and done all appropriate namespace locking.
1489  */
1490 static
1491 int
1492 hammer_vop_nmknod(struct vop_nmknod_args *ap)
1493 {
1494         struct hammer_transaction trans;
1495         struct hammer_inode *dip;
1496         struct hammer_inode *nip;
1497         struct nchandle *nch;
1498         hammer_mount_t hmp;
1499         int error;
1500
1501         nch = ap->a_nch;
1502         dip = VTOI(ap->a_dvp);
1503         hmp = dip->hmp;
1504
1505         if (dip->flags & HAMMER_INODE_RO)
1506                 return (EROFS);
1507         if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
1508                 return (error);
1509
1510         /*
1511          * Create a transaction to cover the operations we perform.
1512          */
1513         lwkt_gettoken(&hmp->fs_token);
1514         hammer_start_transaction(&trans, hmp);
1515         ++hammer_stats_file_iopsw;
1516
1517         /*
1518          * Create a new filesystem object of the requested type.  The
1519          * returned inode will be referenced but not locked.
1520          *
1521          * If mknod specifies a directory a pseudo-fs is created.
1522          */
1523         error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1524                                     dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
1525                                     NULL, &nip);
1526         if (error) {
1527                 hammer_done_transaction(&trans);
1528                 *ap->a_vpp = NULL;
1529                 lwkt_reltoken(&hmp->fs_token);
1530                 return (error);
1531         }
1532
1533         /*
1534          * Add the new filesystem object to the directory.  This will also
1535          * bump the inode's link count.
1536          */
1537         error = hammer_ip_add_directory(&trans, dip,
1538                                         nch->ncp->nc_name, nch->ncp->nc_nlen,
1539                                         nip);
1540
1541         /*
1542          * Finish up.
1543          */
1544         if (error) {
1545                 hammer_rel_inode(nip, 0);
1546                 *ap->a_vpp = NULL;
1547         } else {
1548                 error = hammer_get_vnode(nip, ap->a_vpp);
1549                 hammer_rel_inode(nip, 0);
1550                 if (error == 0) {
1551                         cache_setunresolved(ap->a_nch);
1552                         cache_setvp(ap->a_nch, *ap->a_vpp);
1553                 }
1554         }
1555         hammer_done_transaction(&trans);
1556         if (error == 0)
1557                 hammer_knote(ap->a_dvp, NOTE_WRITE);
1558         lwkt_reltoken(&hmp->fs_token);
1559         return (error);
1560 }
1561
1562 /*
1563  * hammer_vop_open { vp, mode, cred, fp }
1564  *
1565  * MPSAFE (does not require fs_token)
1566  */
1567 static
1568 int
1569 hammer_vop_open(struct vop_open_args *ap)
1570 {
1571         hammer_inode_t ip;
1572
1573         ++hammer_stats_file_iopsr;
1574         ip = VTOI(ap->a_vp);
1575
1576         if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO))
1577                 return (EROFS);
1578         return(vop_stdopen(ap));
1579 }
1580
1581 /*
1582  * hammer_vop_print { vp }
1583  */
1584 static
1585 int
1586 hammer_vop_print(struct vop_print_args *ap)
1587 {
1588         return EOPNOTSUPP;
1589 }
1590
1591 /*
1592  * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies }
1593  */
1594 static
1595 int
1596 hammer_vop_readdir(struct vop_readdir_args *ap)
1597 {
1598         struct hammer_transaction trans;
1599         struct hammer_cursor cursor;
1600         struct hammer_inode *ip;
1601         hammer_mount_t hmp;
1602         struct uio *uio;
1603         hammer_base_elm_t base;
1604         int error;
1605         int cookie_index;
1606         int ncookies;
1607         off_t *cookies;
1608         off_t saveoff;
1609         int r;
1610         int dtype;
1611
1612         ++hammer_stats_file_iopsr;
1613         ip = VTOI(ap->a_vp);
1614         uio = ap->a_uio;
1615         saveoff = uio->uio_offset;
1616         hmp = ip->hmp;
1617
1618         if (ap->a_ncookies) {
1619                 ncookies = uio->uio_resid / 16 + 1;
1620                 if (ncookies > 1024)
1621                         ncookies = 1024;
1622                 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
1623                 cookie_index = 0;
1624         } else {
1625                 ncookies = -1;
1626                 cookies = NULL;
1627                 cookie_index = 0;
1628         }
1629
1630         lwkt_gettoken(&hmp->fs_token);
1631         hammer_simple_transaction(&trans, hmp);
1632
1633         /*
1634          * Handle artificial entries
1635          *
1636          * It should be noted that the minimum value for a directory
1637          * hash key on-media is 0x0000000100000000, so we can use anything
1638          * less then that to represent our 'special' key space.
1639          */
1640         error = 0;
1641         if (saveoff == 0) {
1642                 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, ".");
1643                 if (r)
1644                         goto done;
1645                 if (cookies)
1646                         cookies[cookie_index] = saveoff;
1647                 ++saveoff;
1648                 ++cookie_index;
1649                 if (cookie_index == ncookies)
1650                         goto done;
1651         }
1652         if (saveoff == 1) {
1653                 if (ip->ino_data.parent_obj_id) {
1654                         r = vop_write_dirent(&error, uio,
1655                                              ip->ino_data.parent_obj_id,
1656                                              DT_DIR, 2, "..");
1657                 } else {
1658                         r = vop_write_dirent(&error, uio,
1659                                              ip->obj_id, DT_DIR, 2, "..");
1660                 }
1661                 if (r)
1662                         goto done;
1663                 if (cookies)
1664                         cookies[cookie_index] = saveoff;
1665                 ++saveoff;
1666                 ++cookie_index;
1667                 if (cookie_index == ncookies)
1668                         goto done;
1669         }
1670
1671         /*
1672          * Key range (begin and end inclusive) to scan.  Directory keys
1673          * directly translate to a 64 bit 'seek' position.
1674          */
1675         hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1676         cursor.key_beg.localization = ip->obj_localization +
1677                                       hammer_dir_localization(ip);
1678         cursor.key_beg.obj_id = ip->obj_id;
1679         cursor.key_beg.create_tid = 0;
1680         cursor.key_beg.delete_tid = 0;
1681         cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1682         cursor.key_beg.obj_type = 0;
1683         cursor.key_beg.key = saveoff;
1684
1685         cursor.key_end = cursor.key_beg;
1686         cursor.key_end.key = HAMMER_MAX_KEY;
1687         cursor.asof = ip->obj_asof;
1688         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1689
1690         error = hammer_ip_first(&cursor);
1691
1692         while (error == 0) {
1693                 error = hammer_ip_resolve_data(&cursor);
1694                 if (error)
1695                         break;
1696                 base = &cursor.leaf->base;
1697                 saveoff = base->key;
1698                 KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF);
1699
1700                 if (base->obj_id != ip->obj_id)
1701                         panic("readdir: bad record at %p", cursor.node);
1702
1703                 /*
1704                  * Convert pseudo-filesystems into softlinks
1705                  */
1706                 dtype = hammer_get_dtype(cursor.leaf->base.obj_type);
1707                 r = vop_write_dirent(
1708                              &error, uio, cursor.data->entry.obj_id,
1709                              dtype,
1710                              cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF ,
1711                              (void *)cursor.data->entry.name);
1712                 if (r)
1713                         break;
1714                 ++saveoff;
1715                 if (cookies)
1716                         cookies[cookie_index] = base->key;
1717                 ++cookie_index;
1718                 if (cookie_index == ncookies)
1719                         break;
1720                 error = hammer_ip_next(&cursor);
1721         }
1722         hammer_done_cursor(&cursor);
1723
1724 done:
1725         hammer_done_transaction(&trans);
1726
1727         if (ap->a_eofflag)
1728                 *ap->a_eofflag = (error == ENOENT);
1729         uio->uio_offset = saveoff;
1730         if (error && cookie_index == 0) {
1731                 if (error == ENOENT)
1732                         error = 0;
1733                 if (cookies) {
1734                         kfree(cookies, M_TEMP);
1735                         *ap->a_ncookies = 0;
1736                         *ap->a_cookies = NULL;
1737                 }
1738         } else {
1739                 if (error == ENOENT)
1740                         error = 0;
1741                 if (cookies) {
1742                         *ap->a_ncookies = cookie_index;
1743                         *ap->a_cookies = cookies;
1744                 }
1745         }
1746         lwkt_reltoken(&hmp->fs_token);
1747         return(error);
1748 }
1749
1750 /*
1751  * hammer_vop_readlink { vp, uio, cred }
1752  */
1753 static
1754 int
1755 hammer_vop_readlink(struct vop_readlink_args *ap)
1756 {
1757         struct hammer_transaction trans;
1758         struct hammer_cursor cursor;
1759         struct hammer_inode *ip;
1760         hammer_mount_t hmp;
1761         char buf[32];
1762         u_int32_t localization;
1763         hammer_pseudofs_inmem_t pfsm;
1764         int error;
1765
1766         ip = VTOI(ap->a_vp);
1767         hmp = ip->hmp;
1768
1769         lwkt_gettoken(&hmp->fs_token);
1770
1771         /*
1772          * Shortcut if the symlink data was stuffed into ino_data.
1773          *
1774          * Also expand special "@@PFS%05d" softlinks (expansion only
1775          * occurs for non-historical (current) accesses made from the
1776          * primary filesystem).
1777          */
1778         if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) {
1779                 char *ptr;
1780                 int bytes;
1781
1782                 ptr = ip->ino_data.ext.symlink;
1783                 bytes = (int)ip->ino_data.size;
1784                 if (bytes == 10 &&
1785                     ip->obj_asof == HAMMER_MAX_TID &&
1786                     ip->obj_localization == 0 &&
1787                     strncmp(ptr, "@@PFS", 5) == 0) {
1788                         hammer_simple_transaction(&trans, hmp);
1789                         bcopy(ptr + 5, buf, 5);
1790                         buf[5] = 0;
1791                         localization = strtoul(buf, NULL, 10) << 16;
1792                         pfsm = hammer_load_pseudofs(&trans, localization,
1793                                                     &error);
1794                         if (error == 0) {
1795                                 if (pfsm->pfsd.mirror_flags &
1796                                     HAMMER_PFSD_SLAVE) {
1797                                         /* vap->va_size == 26 */
1798                                         ksnprintf(buf, sizeof(buf),
1799                                                   "@@0x%016llx:%05d",
1800                                                   (long long)pfsm->pfsd.sync_end_tid,
1801                                                   localization >> 16);
1802                                 } else {
1803                                         /* vap->va_size == 10 */
1804                                         ksnprintf(buf, sizeof(buf),
1805                                                   "@@-1:%05d",
1806                                                   localization >> 16);
1807 #if 0
1808                                         ksnprintf(buf, sizeof(buf),
1809                                                   "@@0x%016llx:%05d",
1810                                                   (long long)HAMMER_MAX_TID,
1811                                                   localization >> 16);
1812 #endif
1813                                 }
1814                                 ptr = buf;
1815                                 bytes = strlen(buf);
1816                         }
1817                         if (pfsm)
1818                                 hammer_rel_pseudofs(hmp, pfsm);
1819                         hammer_done_transaction(&trans);
1820                 }
1821                 error = uiomove(ptr, bytes, ap->a_uio);
1822                 lwkt_reltoken(&hmp->fs_token);
1823                 return(error);
1824         }
1825
1826         /*
1827          * Long version
1828          */
1829         hammer_simple_transaction(&trans, hmp);
1830         ++hammer_stats_file_iopsr;
1831         hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1832
1833         /*
1834          * Key range (begin and end inclusive) to scan.  Directory keys
1835          * directly translate to a 64 bit 'seek' position.
1836          */
1837         cursor.key_beg.localization = ip->obj_localization +
1838                                       HAMMER_LOCALIZE_MISC;
1839         cursor.key_beg.obj_id = ip->obj_id;
1840         cursor.key_beg.create_tid = 0;
1841         cursor.key_beg.delete_tid = 0;
1842         cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX;
1843         cursor.key_beg.obj_type = 0;
1844         cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK;
1845         cursor.asof = ip->obj_asof;
1846         cursor.flags |= HAMMER_CURSOR_ASOF;
1847
1848         error = hammer_ip_lookup(&cursor);
1849         if (error == 0) {
1850                 error = hammer_ip_resolve_data(&cursor);
1851                 if (error == 0) {
1852                         KKASSERT(cursor.leaf->data_len >=
1853                                  HAMMER_SYMLINK_NAME_OFF);
1854                         error = uiomove(cursor.data->symlink.name,
1855                                         cursor.leaf->data_len -
1856                                                 HAMMER_SYMLINK_NAME_OFF,
1857                                         ap->a_uio);
1858                 }
1859         }
1860         hammer_done_cursor(&cursor);
1861         hammer_done_transaction(&trans);
1862         lwkt_reltoken(&hmp->fs_token);
1863         return(error);
1864 }
1865
1866 /*
1867  * hammer_vop_nremove { nch, dvp, cred }
1868  */
1869 static
1870 int
1871 hammer_vop_nremove(struct vop_nremove_args *ap)
1872 {
1873         struct hammer_transaction trans;
1874         struct hammer_inode *dip;
1875         hammer_mount_t hmp;
1876         int error;
1877
1878         dip = VTOI(ap->a_dvp);
1879         hmp = dip->hmp;
1880
1881         if (hammer_nohistory(dip) == 0 &&
1882             (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
1883                 return (error);
1884         }
1885
1886         lwkt_gettoken(&hmp->fs_token);
1887         hammer_start_transaction(&trans, hmp);
1888         ++hammer_stats_file_iopsw;
1889         error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 0);
1890         hammer_done_transaction(&trans);
1891         if (error == 0)
1892                 hammer_knote(ap->a_dvp, NOTE_WRITE);
1893         lwkt_reltoken(&hmp->fs_token);
1894         return (error);
1895 }
1896
1897 /*
1898  * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred }
1899  */
1900 static
1901 int
1902 hammer_vop_nrename(struct vop_nrename_args *ap)
1903 {
1904         struct hammer_transaction trans;
1905         struct namecache *fncp;
1906         struct namecache *tncp;
1907         struct hammer_inode *fdip;
1908         struct hammer_inode *tdip;
1909         struct hammer_inode *ip;
1910         hammer_mount_t hmp;
1911         struct hammer_cursor cursor;
1912         int64_t namekey;
1913         u_int32_t max_iterations;
1914         int nlen, error;
1915
1916         if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount)
1917                 return(EXDEV);
1918         if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount)
1919                 return(EXDEV);
1920
1921         fdip = VTOI(ap->a_fdvp);
1922         tdip = VTOI(ap->a_tdvp);
1923         fncp = ap->a_fnch->ncp;
1924         tncp = ap->a_tnch->ncp;
1925         ip = VTOI(fncp->nc_vp);
1926         KKASSERT(ip != NULL);
1927
1928         hmp = ip->hmp;
1929
1930         if (fdip->obj_localization != tdip->obj_localization)
1931                 return(EXDEV);
1932         if (fdip->obj_localization != ip->obj_localization)
1933                 return(EXDEV);
1934
1935         if (fdip->flags & HAMMER_INODE_RO)
1936                 return (EROFS);
1937         if (tdip->flags & HAMMER_INODE_RO)
1938                 return (EROFS);
1939         if (ip->flags & HAMMER_INODE_RO)
1940                 return (EROFS);
1941         if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
1942                 return (error);
1943
1944         lwkt_gettoken(&hmp->fs_token);
1945         hammer_start_transaction(&trans, hmp);
1946         ++hammer_stats_file_iopsw;
1947
1948         /*
1949          * Remove tncp from the target directory and then link ip as
1950          * tncp. XXX pass trans to dounlink
1951          *
1952          * Force the inode sync-time to match the transaction so it is
1953          * in-sync with the creation of the target directory entry.
1954          */
1955         error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp,
1956                                 ap->a_cred, 0, -1);
1957         if (error == 0 || error == ENOENT) {
1958                 error = hammer_ip_add_directory(&trans, tdip,
1959                                                 tncp->nc_name, tncp->nc_nlen,
1960                                                 ip);
1961                 if (error == 0) {
1962                         ip->ino_data.parent_obj_id = tdip->obj_id;
1963                         ip->ino_data.ctime = trans.time;
1964                         hammer_modify_inode(&trans, ip, HAMMER_INODE_DDIRTY);
1965                 }
1966         }
1967         if (error)
1968                 goto failed; /* XXX */
1969
1970         /*
1971          * Locate the record in the originating directory and remove it.
1972          *
1973          * Calculate the namekey and setup the key range for the scan.  This
1974          * works kinda like a chained hash table where the lower 32 bits
1975          * of the namekey synthesize the chain.
1976          *
1977          * The key range is inclusive of both key_beg and key_end.
1978          */
1979         namekey = hammer_directory_namekey(fdip, fncp->nc_name, fncp->nc_nlen,
1980                                            &max_iterations);
1981 retry:
1982         hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip);
1983         cursor.key_beg.localization = fdip->obj_localization +
1984                                       hammer_dir_localization(fdip);
1985         cursor.key_beg.obj_id = fdip->obj_id;
1986         cursor.key_beg.key = namekey;
1987         cursor.key_beg.create_tid = 0;
1988         cursor.key_beg.delete_tid = 0;
1989         cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1990         cursor.key_beg.obj_type = 0;
1991
1992         cursor.key_end = cursor.key_beg;
1993         cursor.key_end.key += max_iterations;
1994         cursor.asof = fdip->obj_asof;
1995         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1996
1997         /*
1998          * Scan all matching records (the chain), locate the one matching
1999          * the requested path component.
2000          *
2001          * The hammer_ip_*() functions merge in-memory records with on-disk
2002          * records for the purposes of the search.
2003          */
2004         error = hammer_ip_first(&cursor);
2005         while (error == 0) {
2006                 if (hammer_ip_resolve_data(&cursor) != 0)
2007                         break;
2008                 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
2009                 KKASSERT(nlen > 0);
2010                 if (fncp->nc_nlen == nlen &&
2011                     bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) {
2012                         break;
2013                 }
2014                 error = hammer_ip_next(&cursor);
2015         }
2016
2017         /*
2018          * If all is ok we have to get the inode so we can adjust nlinks.
2019          *
2020          * WARNING: hammer_ip_del_directory() may have to terminate the
2021          * cursor to avoid a recursion.  It's ok to call hammer_done_cursor()
2022          * twice.
2023          */
2024         if (error == 0)
2025                 error = hammer_ip_del_directory(&trans, &cursor, fdip, ip);
2026
2027         /*
2028          * XXX A deadlock here will break rename's atomicy for the purposes
2029          * of crash recovery.
2030          */
2031         if (error == EDEADLK) {
2032                 hammer_done_cursor(&cursor);
2033                 goto retry;
2034         }
2035
2036         /*
2037          * Cleanup and tell the kernel that the rename succeeded.
2038          */
2039         hammer_done_cursor(&cursor);
2040         if (error == 0) {
2041                 cache_rename(ap->a_fnch, ap->a_tnch);
2042                 hammer_knote(ap->a_fdvp, NOTE_WRITE);
2043                 hammer_knote(ap->a_tdvp, NOTE_WRITE);
2044                 if (ip->vp)
2045                         hammer_knote(ip->vp, NOTE_RENAME);
2046         }
2047
2048 failed:
2049         hammer_done_transaction(&trans);
2050         lwkt_reltoken(&hmp->fs_token);
2051         return (error);
2052 }
2053
2054 /*
2055  * hammer_vop_nrmdir { nch, dvp, cred }
2056  */
2057 static
2058 int
2059 hammer_vop_nrmdir(struct vop_nrmdir_args *ap)
2060 {
2061         struct hammer_transaction trans;
2062         struct hammer_inode *dip;
2063         hammer_mount_t hmp;
2064         int error;
2065
2066         dip = VTOI(ap->a_dvp);
2067         hmp = dip->hmp;
2068
2069         if (hammer_nohistory(dip) == 0 &&
2070             (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
2071                 return (error);
2072         }
2073
2074         lwkt_gettoken(&hmp->fs_token);
2075         hammer_start_transaction(&trans, hmp);
2076         ++hammer_stats_file_iopsw;
2077         error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 1);
2078         hammer_done_transaction(&trans);
2079         if (error == 0)
2080                 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
2081         lwkt_reltoken(&hmp->fs_token);
2082         return (error);
2083 }
2084
2085 /*
2086  * hammer_vop_markatime { vp, cred }
2087  */
2088 static
2089 int
2090 hammer_vop_markatime(struct vop_markatime_args *ap)
2091 {
2092         struct hammer_transaction trans;
2093         struct hammer_inode *ip;
2094         hammer_mount_t hmp;
2095
2096         ip = VTOI(ap->a_vp);
2097         if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
2098                 return (EROFS);
2099         if (ip->flags & HAMMER_INODE_RO)
2100                 return (EROFS);
2101         hmp = ip->hmp;
2102         if (hmp->mp->mnt_flag & MNT_NOATIME)
2103                 return (0);
2104         lwkt_gettoken(&hmp->fs_token);
2105         hammer_start_transaction(&trans, hmp);
2106         ++hammer_stats_file_iopsw;
2107
2108         ip->ino_data.atime = trans.time;
2109         hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME);
2110         hammer_done_transaction(&trans);
2111         hammer_knote(ap->a_vp, NOTE_ATTRIB);
2112         lwkt_reltoken(&hmp->fs_token);
2113         return (0);
2114 }
2115
2116 /*
2117  * hammer_vop_setattr { vp, vap, cred }
2118  */
2119 static
2120 int
2121 hammer_vop_setattr(struct vop_setattr_args *ap)
2122 {
2123         struct hammer_transaction trans;
2124         struct hammer_inode *ip;
2125         struct vattr *vap;
2126         hammer_mount_t hmp;
2127         int modflags;
2128         int error;
2129         int truncating;
2130         int blksize;
2131         int kflags;
2132 #if 0
2133         int64_t aligned_size;
2134 #endif
2135         u_int32_t flags;
2136
2137         vap = ap->a_vap;
2138         ip = ap->a_vp->v_data;
2139         modflags = 0;
2140         kflags = 0;
2141         hmp = ip->hmp;
2142
2143         if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
2144                 return(EROFS);
2145         if (ip->flags & HAMMER_INODE_RO)
2146                 return (EROFS);
2147         if (hammer_nohistory(ip) == 0 &&
2148             (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
2149                 return (error);
2150         }
2151
2152         lwkt_gettoken(&hmp->fs_token);
2153         hammer_start_transaction(&trans, hmp);
2154         ++hammer_stats_file_iopsw;
2155         error = 0;
2156
2157         if (vap->va_flags != VNOVAL) {
2158                 flags = ip->ino_data.uflags;
2159                 error = vop_helper_setattr_flags(&flags, vap->va_flags,
2160                                          hammer_to_unix_xid(&ip->ino_data.uid),
2161                                          ap->a_cred);
2162                 if (error == 0) {
2163                         if (ip->ino_data.uflags != flags) {
2164                                 ip->ino_data.uflags = flags;
2165                                 ip->ino_data.ctime = trans.time;
2166                                 modflags |= HAMMER_INODE_DDIRTY;
2167                                 kflags |= NOTE_ATTRIB;
2168                         }
2169                         if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
2170                                 error = 0;
2171                                 goto done;
2172                         }
2173                 }
2174                 goto done;
2175         }
2176         if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
2177                 error = EPERM;
2178                 goto done;
2179         }
2180         if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
2181                 mode_t cur_mode = ip->ino_data.mode;
2182                 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid);
2183                 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid);
2184                 uuid_t uuid_uid;
2185                 uuid_t uuid_gid;
2186
2187                 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid,
2188                                          ap->a_cred,
2189                                          &cur_uid, &cur_gid, &cur_mode);
2190                 if (error == 0) {
2191                         hammer_guid_to_uuid(&uuid_uid, cur_uid);
2192                         hammer_guid_to_uuid(&uuid_gid, cur_gid);
2193                         if (bcmp(&uuid_uid, &ip->ino_data.uid,
2194                                  sizeof(uuid_uid)) ||
2195                             bcmp(&uuid_gid, &ip->ino_data.gid,
2196                                  sizeof(uuid_gid)) ||
2197                             ip->ino_data.mode != cur_mode
2198                         ) {
2199                                 ip->ino_data.uid = uuid_uid;
2200                                 ip->ino_data.gid = uuid_gid;
2201                                 ip->ino_data.mode = cur_mode;
2202                                 ip->ino_data.ctime = trans.time;
2203                                 modflags |= HAMMER_INODE_DDIRTY;
2204                         }
2205                         kflags |= NOTE_ATTRIB;
2206                 }
2207         }
2208         while (vap->va_size != VNOVAL && ip->ino_data.size != vap->va_size) {
2209                 switch(ap->a_vp->v_type) {
2210                 case VREG:
2211                         if (vap->va_size == ip->ino_data.size)
2212                                 break;
2213
2214                         /*
2215                          * Log the operation if in fast-fsync mode or if
2216                          * there are unterminated redo write records present.
2217                          *
2218                          * The second check is needed so the recovery code
2219                          * properly truncates write redos even if nominal
2220                          * REDO operations is turned off due to excessive
2221                          * writes, because the related records might be
2222                          * destroyed and never lay down a TERM_WRITE.
2223                          */
2224                         if ((ip->flags & HAMMER_INODE_REDO) ||
2225                             (ip->flags & HAMMER_INODE_RDIRTY)) {
2226                                 error = hammer_generate_redo(&trans, ip,
2227                                                              vap->va_size,
2228                                                              HAMMER_REDO_TRUNC,
2229                                                              NULL, 0);
2230                         }
2231                         blksize = hammer_blocksize(vap->va_size);
2232
2233                         /*
2234                          * XXX break atomicy, we can deadlock the backend
2235                          * if we do not release the lock.  Probably not a
2236                          * big deal here.
2237                          */
2238                         if (vap->va_size < ip->ino_data.size) {
2239                                 nvtruncbuf(ap->a_vp, vap->va_size,
2240                                            blksize,
2241                                            hammer_blockoff(vap->va_size));
2242                                 truncating = 1;
2243                                 kflags |= NOTE_WRITE;
2244                         } else {
2245                                 nvextendbuf(ap->a_vp,
2246                                             ip->ino_data.size,
2247                                             vap->va_size,
2248                                             hammer_blocksize(ip->ino_data.size),
2249                                             hammer_blocksize(vap->va_size),
2250                                             hammer_blockoff(ip->ino_data.size),
2251                                             hammer_blockoff(vap->va_size),
2252                                             0);
2253                                 truncating = 0;
2254                                 kflags |= NOTE_WRITE | NOTE_EXTEND;
2255                         }
2256                         ip->ino_data.size = vap->va_size;
2257                         ip->ino_data.mtime = trans.time;
2258                         /* XXX safe to use SDIRTY instead of DDIRTY here? */
2259                         modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY;
2260
2261                         /*
2262                          * On-media truncation is cached in the inode until
2263                          * the inode is synchronized.  We must immediately
2264                          * handle any frontend records.
2265                          */
2266                         if (truncating) {
2267                                 hammer_ip_frontend_trunc(ip, vap->va_size);
2268 #ifdef DEBUG_TRUNCATE
2269                                 if (HammerTruncIp == NULL)
2270                                         HammerTruncIp = ip;
2271 #endif
2272                                 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) {
2273                                         ip->flags |= HAMMER_INODE_TRUNCATED;
2274                                         ip->trunc_off = vap->va_size;
2275 #ifdef DEBUG_TRUNCATE
2276                                         if (ip == HammerTruncIp)
2277                                         kprintf("truncate1 %016llx\n",
2278                                                 (long long)ip->trunc_off);
2279 #endif
2280                                 } else if (ip->trunc_off > vap->va_size) {
2281                                         ip->trunc_off = vap->va_size;
2282 #ifdef DEBUG_TRUNCATE
2283                                         if (ip == HammerTruncIp)
2284                                         kprintf("truncate2 %016llx\n",
2285                                                 (long long)ip->trunc_off);
2286 #endif
2287                                 } else {
2288 #ifdef DEBUG_TRUNCATE
2289                                         if (ip == HammerTruncIp)
2290                                         kprintf("truncate3 %016llx (ignored)\n",
2291                                                 (long long)vap->va_size);
2292 #endif
2293                                 }
2294                         }
2295
2296 #if 0
2297                         /*
2298                          * When truncating, nvtruncbuf() may have cleaned out
2299                          * a portion of the last block on-disk in the buffer
2300                          * cache.  We must clean out any frontend records
2301                          * for blocks beyond the new last block.
2302                          */
2303                         aligned_size = (vap->va_size + (blksize - 1)) &
2304                                        ~(int64_t)(blksize - 1);
2305                         if (truncating && vap->va_size < aligned_size) {
2306                                 aligned_size -= blksize;
2307                                 hammer_ip_frontend_trunc(ip, aligned_size);
2308                         }
2309 #endif
2310                         break;
2311                 case VDATABASE:
2312                         if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) {
2313                                 ip->flags |= HAMMER_INODE_TRUNCATED;
2314                                 ip->trunc_off = vap->va_size;
2315                         } else if (ip->trunc_off > vap->va_size) {
2316                                 ip->trunc_off = vap->va_size;
2317                         }
2318                         hammer_ip_frontend_trunc(ip, vap->va_size);
2319                         ip->ino_data.size = vap->va_size;
2320                         ip->ino_data.mtime = trans.time;
2321                         modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY;
2322                         kflags |= NOTE_ATTRIB;
2323                         break;
2324                 default:
2325                         error = EINVAL;
2326                         goto done;
2327                 }
2328                 break;
2329         }
2330         if (vap->va_atime.tv_sec != VNOVAL) {
2331                 ip->ino_data.atime = hammer_timespec_to_time(&vap->va_atime);
2332                 modflags |= HAMMER_INODE_ATIME;
2333                 kflags |= NOTE_ATTRIB;
2334         }
2335         if (vap->va_mtime.tv_sec != VNOVAL) {
2336                 ip->ino_data.mtime = hammer_timespec_to_time(&vap->va_mtime);
2337                 modflags |= HAMMER_INODE_MTIME;
2338                 kflags |= NOTE_ATTRIB;
2339         }
2340         if (vap->va_mode != (mode_t)VNOVAL) {
2341                 mode_t   cur_mode = ip->ino_data.mode;
2342                 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid);
2343                 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid);
2344
2345                 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred,
2346                                          cur_uid, cur_gid, &cur_mode);
2347                 if (error == 0 && ip->ino_data.mode != cur_mode) {
2348                         ip->ino_data.mode = cur_mode;
2349                         ip->ino_data.ctime = trans.time;
2350                         modflags |= HAMMER_INODE_DDIRTY;
2351                         kflags |= NOTE_ATTRIB;
2352                 }
2353         }
2354 done:
2355         if (error == 0)
2356                 hammer_modify_inode(&trans, ip, modflags);
2357         hammer_done_transaction(&trans);
2358         hammer_knote(ap->a_vp, kflags);
2359         lwkt_reltoken(&hmp->fs_token);
2360         return (error);
2361 }
2362
2363 /*
2364  * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target }
2365  */
2366 static
2367 int
2368 hammer_vop_nsymlink(struct vop_nsymlink_args *ap)
2369 {
2370         struct hammer_transaction trans;
2371         struct hammer_inode *dip;
2372         struct hammer_inode *nip;
2373         hammer_record_t record;
2374         struct nchandle *nch;
2375         hammer_mount_t hmp;
2376         int error;
2377         int bytes;
2378
2379         ap->a_vap->va_type = VLNK;
2380
2381         nch = ap->a_nch;
2382         dip = VTOI(ap->a_dvp);
2383         hmp = dip->hmp;
2384
2385         if (dip->flags & HAMMER_INODE_RO)
2386                 return (EROFS);
2387         if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
2388                 return (error);
2389
2390         /*
2391          * Create a transaction to cover the operations we perform.
2392          */
2393         lwkt_gettoken(&hmp->fs_token);
2394         hammer_start_transaction(&trans, hmp);
2395         ++hammer_stats_file_iopsw;
2396
2397         /*
2398          * Create a new filesystem object of the requested type.  The
2399          * returned inode will be referenced but not locked.
2400          */
2401
2402         error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
2403                                     dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
2404                                     NULL, &nip);
2405         if (error) {
2406                 hammer_done_transaction(&trans);
2407                 *ap->a_vpp = NULL;
2408                 lwkt_reltoken(&hmp->fs_token);
2409                 return (error);
2410         }
2411
2412         /*
2413          * Add a record representing the symlink.  symlink stores the link
2414          * as pure data, not a string, and is no \0 terminated.
2415          */
2416         if (error == 0) {
2417                 bytes = strlen(ap->a_target);
2418
2419                 if (bytes <= HAMMER_INODE_BASESYMLEN) {
2420                         bcopy(ap->a_target, nip->ino_data.ext.symlink, bytes);
2421                 } else {
2422                         record = hammer_alloc_mem_record(nip, bytes);
2423                         record->type = HAMMER_MEM_RECORD_GENERAL;
2424
2425                         record->leaf.base.localization = nip->obj_localization +
2426                                                          HAMMER_LOCALIZE_MISC;
2427                         record->leaf.base.key = HAMMER_FIXKEY_SYMLINK;
2428                         record->leaf.base.rec_type = HAMMER_RECTYPE_FIX;
2429                         record->leaf.data_len = bytes;
2430                         KKASSERT(HAMMER_SYMLINK_NAME_OFF == 0);
2431                         bcopy(ap->a_target, record->data->symlink.name, bytes);
2432                         error = hammer_ip_add_record(&trans, record);
2433                 }
2434
2435                 /*
2436                  * Set the file size to the length of the link.
2437                  */
2438                 if (error == 0) {
2439                         nip->ino_data.size = bytes;
2440                         hammer_modify_inode(&trans, nip, HAMMER_INODE_DDIRTY);
2441                 }
2442         }
2443         if (error == 0)
2444                 error = hammer_ip_add_directory(&trans, dip, nch->ncp->nc_name,
2445                                                 nch->ncp->nc_nlen, nip);
2446
2447         /*
2448          * Finish up.
2449          */
2450         if (error) {
2451                 hammer_rel_inode(nip, 0);
2452                 *ap->a_vpp = NULL;
2453         } else {
2454                 error = hammer_get_vnode(nip, ap->a_vpp);
2455                 hammer_rel_inode(nip, 0);
2456                 if (error == 0) {
2457                         cache_setunresolved(ap->a_nch);
2458                         cache_setvp(ap->a_nch, *ap->a_vpp);
2459                         hammer_knote(ap->a_dvp, NOTE_WRITE);
2460                 }
2461         }
2462         hammer_done_transaction(&trans);
2463         lwkt_reltoken(&hmp->fs_token);
2464         return (error);
2465 }
2466
2467 /*
2468  * hammer_vop_nwhiteout { nch, dvp, cred, flags }
2469  */
2470 static
2471 int
2472 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap)
2473 {
2474         struct hammer_transaction trans;
2475         struct hammer_inode *dip;
2476         hammer_mount_t hmp;
2477         int error;
2478
2479         dip = VTOI(ap->a_dvp);
2480         hmp = dip->hmp;
2481
2482         if (hammer_nohistory(dip) == 0 &&
2483             (error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) {
2484                 return (error);
2485         }
2486
2487         lwkt_gettoken(&hmp->fs_token);
2488         hammer_start_transaction(&trans, hmp);
2489         ++hammer_stats_file_iopsw;
2490         error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp,
2491                                 ap->a_cred, ap->a_flags, -1);
2492         hammer_done_transaction(&trans);
2493         lwkt_reltoken(&hmp->fs_token);
2494
2495         return (error);
2496 }
2497
2498 /*
2499  * hammer_vop_ioctl { vp, command, data, fflag, cred }
2500  */
2501 static
2502 int
2503 hammer_vop_ioctl(struct vop_ioctl_args *ap)
2504 {
2505         struct hammer_inode *ip = ap->a_vp->v_data;
2506         hammer_mount_t hmp = ip->hmp;
2507         int error;
2508
2509         ++hammer_stats_file_iopsr;
2510         lwkt_gettoken(&hmp->fs_token);
2511         error = hammer_ioctl(ip, ap->a_command, ap->a_data,
2512                              ap->a_fflag, ap->a_cred);
2513         lwkt_reltoken(&hmp->fs_token);
2514         return (error);
2515 }
2516
2517 static
2518 int
2519 hammer_vop_mountctl(struct vop_mountctl_args *ap)
2520 {
2521         static const struct mountctl_opt extraopt[] = {
2522                 { HMNT_NOHISTORY,       "nohistory" },
2523                 { HMNT_MASTERID,        "master" },
2524                 { 0, NULL}
2525
2526         };
2527         struct hammer_mount *hmp;
2528         struct mount *mp;
2529         int usedbytes;
2530         int error;
2531
2532         error = 0;
2533         usedbytes = 0;
2534         mp = ap->a_head.a_ops->head.vv_mount;
2535         KKASSERT(mp->mnt_data != NULL);
2536         hmp = (struct hammer_mount *)mp->mnt_data;
2537
2538         lwkt_gettoken(&hmp->fs_token);
2539
2540         switch(ap->a_op) {
2541         case MOUNTCTL_SET_EXPORT:
2542                 if (ap->a_ctllen != sizeof(struct export_args))
2543                         error = EINVAL;
2544                 else
2545                         error = hammer_vfs_export(mp, ap->a_op,
2546                                       (const struct export_args *)ap->a_ctl);
2547                 break;
2548         case MOUNTCTL_MOUNTFLAGS:
2549         {
2550                 /*
2551                  * Call standard mountctl VOP function
2552                  * so we get user mount flags.
2553                  */
2554                 error = vop_stdmountctl(ap);
2555                 if (error)
2556                         break;
2557
2558                 usedbytes = *ap->a_res;
2559
2560                 if (usedbytes > 0 && usedbytes < ap->a_buflen) {
2561                         usedbytes += vfs_flagstostr(hmp->hflags, extraopt,
2562                                                     ap->a_buf,
2563                                                     ap->a_buflen - usedbytes,
2564                                                     &error);
2565                 }
2566
2567                 *ap->a_res += usedbytes;
2568                 break;
2569         }
2570         default:
2571                 error = vop_stdmountctl(ap);
2572                 break;
2573         }
2574         lwkt_reltoken(&hmp->fs_token);
2575         return(error);
2576 }
2577
2578 /*
2579  * hammer_vop_strategy { vp, bio }
2580  *
2581  * Strategy call, used for regular file read & write only.  Note that the
2582  * bp may represent a cluster.
2583  *
2584  * To simplify operation and allow better optimizations in the future,
2585  * this code does not make any assumptions with regards to buffer alignment
2586  * or size.
2587  */
2588 static
2589 int
2590 hammer_vop_strategy(struct vop_strategy_args *ap)
2591 {
2592         struct buf *bp;
2593         int error;
2594
2595         bp = ap->a_bio->bio_buf;
2596
2597         switch(bp->b_cmd) {
2598         case BUF_CMD_READ:
2599                 error = hammer_vop_strategy_read(ap);
2600                 break;
2601         case BUF_CMD_WRITE:
2602                 error = hammer_vop_strategy_write(ap);
2603                 break;
2604         default:
2605                 bp->b_error = error = EINVAL;
2606                 bp->b_flags |= B_ERROR;
2607                 biodone(ap->a_bio);
2608                 break;
2609         }
2610         return (error);
2611 }
2612
2613 /*
2614  * Read from a regular file.  Iterate the related records and fill in the
2615  * BIO/BUF.  Gaps are zero-filled.
2616  *
2617  * The support code in hammer_object.c should be used to deal with mixed
2618  * in-memory and on-disk records.
2619  *
2620  * NOTE: Can be called from the cluster code with an oversized buf.
2621  *
2622  * XXX atime update
2623  */
2624 static
2625 int
2626 hammer_vop_strategy_read(struct vop_strategy_args *ap)
2627 {
2628         struct hammer_transaction trans;
2629         struct hammer_inode *ip;
2630         struct hammer_inode *dip;
2631         hammer_mount_t hmp;
2632         struct hammer_cursor cursor;
2633         hammer_base_elm_t base;
2634         hammer_off_t disk_offset;
2635         struct bio *bio;
2636         struct bio *nbio;
2637         struct buf *bp;
2638         int64_t rec_offset;
2639         int64_t ran_end;
2640         int64_t tmp64;
2641         int error;
2642         int boff;
2643         int roff;
2644         int n;
2645
2646         bio = ap->a_bio;
2647         bp = bio->bio_buf;
2648         ip = ap->a_vp->v_data;
2649         hmp = ip->hmp;
2650
2651         /*
2652          * The zone-2 disk offset may have been set by the cluster code via
2653          * a BMAP operation, or else should be NOOFFSET.
2654          *
2655          * Checking the high bits for a match against zone-2 should suffice.
2656          */
2657         nbio = push_bio(bio);
2658         if ((nbio->bio_offset & HAMMER_OFF_ZONE_MASK) ==
2659             HAMMER_ZONE_LARGE_DATA) {
2660                 lwkt_gettoken(&hmp->fs_token);
2661                 error = hammer_io_direct_read(hmp, nbio, NULL);
2662                 lwkt_reltoken(&hmp->fs_token);
2663                 return (error);
2664         }
2665
2666         /*
2667          * Well, that sucked.  Do it the hard way.  If all the stars are
2668          * aligned we may still be able to issue a direct-read.
2669          */
2670         lwkt_gettoken(&hmp->fs_token);
2671         hammer_simple_transaction(&trans, hmp);
2672         hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
2673
2674         /*
2675          * Key range (begin and end inclusive) to scan.  Note that the key's
2676          * stored in the actual records represent BASE+LEN, not BASE.  The
2677          * first record containing bio_offset will have a key > bio_offset.
2678          */
2679         cursor.key_beg.localization = ip->obj_localization +
2680                                       HAMMER_LOCALIZE_MISC;
2681         cursor.key_beg.obj_id = ip->obj_id;
2682         cursor.key_beg.create_tid = 0;
2683         cursor.key_beg.delete_tid = 0;
2684         cursor.key_beg.obj_type = 0;
2685         cursor.key_beg.key = bio->bio_offset + 1;
2686         cursor.asof = ip->obj_asof;
2687         cursor.flags |= HAMMER_CURSOR_ASOF;
2688
2689         cursor.key_end = cursor.key_beg;
2690         KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
2691 #if 0
2692         if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) {
2693                 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB;
2694                 cursor.key_end.rec_type = HAMMER_RECTYPE_DB;
2695                 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2696         } else
2697 #endif
2698         {
2699                 ran_end = bio->bio_offset + bp->b_bufsize;
2700                 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
2701                 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
2702                 tmp64 = ran_end + MAXPHYS + 1;  /* work-around GCC-4 bug */
2703                 if (tmp64 < ran_end)
2704                         cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2705                 else
2706                         cursor.key_end.key = ran_end + MAXPHYS + 1;
2707         }
2708         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
2709
2710         error = hammer_ip_first(&cursor);
2711         boff = 0;
2712
2713         while (error == 0) {
2714                 /*
2715                  * Get the base file offset of the record.  The key for
2716                  * data records is (base + bytes) rather then (base).
2717                  */
2718                 base = &cursor.leaf->base;
2719                 rec_offset = base->key - cursor.leaf->data_len;
2720
2721                 /*
2722                  * Calculate the gap, if any, and zero-fill it.
2723                  *
2724                  * n is the offset of the start of the record verses our
2725                  * current seek offset in the bio.
2726                  */
2727                 n = (int)(rec_offset - (bio->bio_offset + boff));
2728                 if (n > 0) {
2729                         if (n > bp->b_bufsize - boff)
2730                                 n = bp->b_bufsize - boff;
2731                         bzero((char *)bp->b_data + boff, n);
2732                         boff += n;
2733                         n = 0;
2734                 }
2735
2736                 /*
2737                  * Calculate the data offset in the record and the number
2738                  * of bytes we can copy.
2739                  *
2740                  * There are two degenerate cases.  First, boff may already
2741                  * be at bp->b_bufsize.  Secondly, the data offset within
2742                  * the record may exceed the record's size.
2743                  */
2744                 roff = -n;
2745                 rec_offset += roff;
2746                 n = cursor.leaf->data_len - roff;
2747                 if (n <= 0) {
2748                         kprintf("strategy_read: bad n=%d roff=%d\n", n, roff);
2749                         n = 0;
2750                 } else if (n > bp->b_bufsize - boff) {
2751                         n = bp->b_bufsize - boff;
2752                 }
2753
2754                 /*
2755                  * Deal with cached truncations.  This cool bit of code
2756                  * allows truncate()/ftruncate() to avoid having to sync
2757                  * the file.
2758                  *
2759                  * If the frontend is truncated then all backend records are
2760                  * subject to the frontend's truncation.
2761                  *
2762                  * If the backend is truncated then backend records on-disk
2763                  * (but not in-memory) are subject to the backend's
2764                  * truncation.  In-memory records owned by the backend
2765                  * represent data written after the truncation point on the
2766                  * backend and must not be truncated.
2767                  *
2768                  * Truncate operations deal with frontend buffer cache
2769                  * buffers and frontend-owned in-memory records synchronously.
2770                  */
2771                 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2772                         if (hammer_cursor_ondisk(&cursor)/* ||
2773                             cursor.iprec->flush_state == HAMMER_FST_FLUSH*/) {
2774                                 if (ip->trunc_off <= rec_offset)
2775                                         n = 0;
2776                                 else if (ip->trunc_off < rec_offset + n)
2777                                         n = (int)(ip->trunc_off - rec_offset);
2778                         }
2779                 }
2780                 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2781                         if (hammer_cursor_ondisk(&cursor)) {
2782                                 if (ip->sync_trunc_off <= rec_offset)
2783                                         n = 0;
2784                                 else if (ip->sync_trunc_off < rec_offset + n)
2785                                         n = (int)(ip->sync_trunc_off - rec_offset);
2786                         }
2787                 }
2788
2789                 /*
2790                  * Try to issue a direct read into our bio if possible,
2791                  * otherwise resolve the element data into a hammer_buffer
2792                  * and copy.
2793                  *
2794                  * The buffer on-disk should be zerod past any real
2795                  * truncation point, but may not be for any synthesized
2796                  * truncation point from above.
2797                  */
2798                 disk_offset = cursor.leaf->data_offset + roff;
2799                 if (boff == 0 && n == bp->b_bufsize &&
2800                     hammer_cursor_ondisk(&cursor) &&
2801                     (disk_offset & HAMMER_BUFMASK) == 0) {
2802                         KKASSERT((disk_offset & HAMMER_OFF_ZONE_MASK) ==
2803                                  HAMMER_ZONE_LARGE_DATA);
2804                         nbio->bio_offset = disk_offset;
2805                         error = hammer_io_direct_read(hmp, nbio, cursor.leaf);
2806                         goto done;
2807                 } else if (n) {
2808                         error = hammer_ip_resolve_data(&cursor);
2809                         if (error == 0) {
2810                                 bcopy((char *)cursor.data + roff,
2811                                       (char *)bp->b_data + boff, n);
2812                         }
2813                 }
2814                 if (error)
2815                         break;
2816
2817                 /*
2818                  * Iterate until we have filled the request.
2819                  */
2820                 boff += n;
2821                 if (boff == bp->b_bufsize)
2822                         break;
2823                 error = hammer_ip_next(&cursor);
2824         }
2825
2826         /*
2827          * There may have been a gap after the last record
2828          */
2829         if (error == ENOENT)
2830                 error = 0;
2831         if (error == 0 && boff != bp->b_bufsize) {
2832                 KKASSERT(boff < bp->b_bufsize);
2833                 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff);
2834                 /* boff = bp->b_bufsize; */
2835         }
2836         bp->b_resid = 0;
2837         bp->b_error = error;
2838         if (error)
2839                 bp->b_flags |= B_ERROR;
2840         biodone(ap->a_bio);
2841
2842 done:
2843         /*
2844          * Cache the b-tree node for the last data read in cache[1].
2845          *
2846          * If we hit the file EOF then also cache the node in the
2847          * governing director's cache[3], it will be used to initialize
2848          * the inode's cache[1] for any inodes looked up via the directory.
2849          *
2850          * This doesn't reduce disk accesses since the B-Tree chain is
2851          * likely cached, but it does reduce cpu overhead when looking
2852          * up file offsets for cpdup/tar/cpio style iterations.
2853          */
2854         if (cursor.node)
2855                 hammer_cache_node(&ip->cache[1], cursor.node);
2856         if (ran_end >= ip->ino_data.size) {
2857                 dip = hammer_find_inode(&trans, ip->ino_data.parent_obj_id,
2858                                         ip->obj_asof, ip->obj_localization);
2859                 if (dip) {
2860                         hammer_cache_node(&dip->cache[3], cursor.node);
2861                         hammer_rel_inode(dip, 0);
2862                 }
2863         }
2864         hammer_done_cursor(&cursor);
2865         hammer_done_transaction(&trans);
2866         lwkt_reltoken(&hmp->fs_token);
2867         return(error);
2868 }
2869
2870 /*
2871  * BMAP operation - used to support cluster_read() only.
2872  *
2873  * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb)
2874  *
2875  * This routine may return EOPNOTSUPP if the opration is not supported for
2876  * the specified offset.  The contents of the pointer arguments do not
2877  * need to be initialized in that case.
2878  *
2879  * If a disk address is available and properly aligned return 0 with
2880  * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately
2881  * to the run-length relative to that offset.  Callers may assume that
2882  * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently
2883  * large, so return EOPNOTSUPP if it is not sufficiently large.
2884  */
2885 static
2886 int
2887 hammer_vop_bmap(struct vop_bmap_args *ap)
2888 {
2889         struct hammer_transaction trans;
2890         struct hammer_inode *ip;
2891         hammer_mount_t hmp;
2892         struct hammer_cursor cursor;
2893         hammer_base_elm_t base;
2894         int64_t rec_offset;
2895         int64_t ran_end;
2896         int64_t tmp64;
2897         int64_t base_offset;
2898         int64_t base_disk_offset;
2899         int64_t last_offset;
2900         hammer_off_t last_disk_offset;
2901         hammer_off_t disk_offset;
2902         int     rec_len;
2903         int     error;
2904         int     blksize;
2905
2906         ++hammer_stats_file_iopsr;
2907         ip = ap->a_vp->v_data;
2908         hmp = ip->hmp;
2909
2910         /*
2911          * We can only BMAP regular files.  We can't BMAP database files,
2912          * directories, etc.
2913          */
2914         if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE)
2915                 return(EOPNOTSUPP);
2916
2917         /*
2918          * bmap is typically called with runp/runb both NULL when used
2919          * for writing.  We do not support BMAP for writing atm.
2920          */
2921         if (ap->a_cmd != BUF_CMD_READ)
2922                 return(EOPNOTSUPP);
2923
2924         /*
2925          * Scan the B-Tree to acquire blockmap addresses, then translate
2926          * to raw addresses.
2927          */
2928         lwkt_gettoken(&hmp->fs_token);
2929         hammer_simple_transaction(&trans, hmp);
2930 #if 0
2931         kprintf("bmap_beg %016llx ip->cache %p\n",
2932                 (long long)ap->a_loffset, ip->cache[1]);
2933 #endif
2934         hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
2935
2936         /*
2937          * Key range (begin and end inclusive) to scan.  Note that the key's
2938          * stored in the actual records represent BASE+LEN, not BASE.  The
2939          * first record containing bio_offset will have a key > bio_offset.
2940          */
2941         cursor.key_beg.localization = ip->obj_localization +
2942                                       HAMMER_LOCALIZE_MISC;
2943         cursor.key_beg.obj_id = ip->obj_id;
2944         cursor.key_beg.create_tid = 0;
2945         cursor.key_beg.delete_tid = 0;
2946         cursor.key_beg.obj_type = 0;
2947         if (ap->a_runb)
2948                 cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1;
2949         else
2950                 cursor.key_beg.key = ap->a_loffset + 1;
2951         if (cursor.key_beg.key < 0)
2952                 cursor.key_beg.key = 0;
2953         cursor.asof = ip->obj_asof;
2954         cursor.flags |= HAMMER_CURSOR_ASOF;
2955
2956         cursor.key_end = cursor.key_beg;
2957         KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
2958
2959         ran_end = ap->a_loffset + MAXPHYS;
2960         cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
2961         cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
2962         tmp64 = ran_end + MAXPHYS + 1;  /* work-around GCC-4 bug */
2963         if (tmp64 < ran_end)
2964                 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2965         else
2966                 cursor.key_end.key = ran_end + MAXPHYS + 1;
2967
2968         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
2969
2970         error = hammer_ip_first(&cursor);
2971         base_offset = last_offset = 0;
2972         base_disk_offset = last_disk_offset = 0;
2973
2974         while (error == 0) {
2975                 /*
2976                  * Get the base file offset of the record.  The key for
2977                  * data records is (base + bytes) rather then (base).
2978                  *
2979                  * NOTE: rec_offset + rec_len may exceed the end-of-file.
2980                  * The extra bytes should be zero on-disk and the BMAP op
2981                  * should still be ok.
2982                  */
2983                 base = &cursor.leaf->base;
2984                 rec_offset = base->key - cursor.leaf->data_len;
2985                 rec_len    = cursor.leaf->data_len;
2986
2987                 /*
2988                  * Incorporate any cached truncation.
2989                  *
2990                  * NOTE: Modifications to rec_len based on synthesized
2991                  * truncation points remove the guarantee that any extended
2992                  * data on disk is zero (since the truncations may not have
2993                  * taken place on-media yet).
2994                  */
2995                 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2996                         if (hammer_cursor_ondisk(&cursor) ||
2997                             cursor.iprec->flush_state == HAMMER_FST_FLUSH) {
2998                                 if (ip->trunc_off <= rec_offset)
2999                                         rec_len = 0;
3000                                 else if (ip->trunc_off < rec_offset + rec_len)
3001                                         rec_len = (int)(ip->trunc_off - rec_offset);
3002                         }
3003                 }
3004                 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
3005                         if (hammer_cursor_ondisk(&cursor)) {
3006                                 if (ip->sync_trunc_off <= rec_offset)
3007                                         rec_len = 0;
3008                                 else if (ip->sync_trunc_off < rec_offset + rec_len)
3009                                         rec_len = (int)(ip->sync_trunc_off - rec_offset);
3010                         }
3011                 }
3012
3013                 /*
3014                  * Accumulate information.  If we have hit a discontiguous
3015                  * block reset base_offset unless we are already beyond the
3016                  * requested offset.  If we are, that's it, we stop.
3017                  */
3018                 if (error)
3019                         break;
3020                 if (hammer_cursor_ondisk(&cursor)) {
3021                         disk_offset = cursor.leaf->data_offset;
3022                         if (rec_offset != last_offset ||
3023                             disk_offset != last_disk_offset) {
3024                                 if (rec_offset > ap->a_loffset)
3025                                         break;
3026                                 base_offset = rec_offset;
3027                                 base_disk_offset = disk_offset;
3028                         }
3029                         last_offset = rec_offset + rec_len;
3030                         last_disk_offset = disk_offset + rec_len;
3031                 }
3032                 error = hammer_ip_next(&cursor);
3033         }
3034
3035 #if 0
3036         kprintf("BMAP %016llx:  %016llx - %016llx\n",
3037                 (long long)ap->a_loffset,
3038                 (long long)base_offset,
3039                 (long long)last_offset);
3040         kprintf("BMAP %16s:  %016llx - %016llx\n", "",
3041                 (long long)base_disk_offset,
3042                 (long long)last_disk_offset);
3043 #endif
3044
3045         if (cursor.node) {
3046                 hammer_cache_node(&ip->cache[1], cursor.node);
3047 #if 0
3048                 kprintf("bmap_end2 %016llx ip->cache %p\n",
3049                         (long long)ap->a_loffset, ip->cache[1]);
3050 #endif
3051         }
3052         hammer_done_cursor(&cursor);
3053         hammer_done_transaction(&trans);
3054         lwkt_reltoken(&hmp->fs_token);
3055
3056         /*
3057          * If we couldn't find any records or the records we did find were
3058          * all behind the requested offset, return failure.  A forward
3059          * truncation can leave a hole w/ no on-disk records.
3060          */
3061         if (last_offset == 0 || last_offset < ap->a_loffset)
3062                 return (EOPNOTSUPP);
3063
3064         /*
3065          * Figure out the block size at the requested offset and adjust
3066          * our limits so the cluster_read() does not create inappropriately
3067          * sized buffer cache buffers.
3068          */
3069         blksize = hammer_blocksize(ap->a_loffset);
3070         if (hammer_blocksize(base_offset) != blksize) {
3071                 base_offset = hammer_blockdemarc(base_offset, ap->a_loffset);
3072         }
3073         if (last_offset != ap->a_loffset &&
3074             hammer_blocksize(last_offset - 1) != blksize) {
3075                 last_offset = hammer_blockdemarc(ap->a_loffset,
3076                                                  last_offset - 1);
3077         }
3078
3079         /*
3080          * Returning EOPNOTSUPP simply prevents the direct-IO optimization
3081          * from occuring.
3082          */
3083         disk_offset = base_disk_offset + (ap->a_loffset - base_offset);
3084
3085         if ((disk_offset & HAMMER_OFF_ZONE_MASK) != HAMMER_ZONE_LARGE_DATA) {
3086                 /*
3087                  * Only large-data zones can be direct-IOd
3088                  */
3089                 error = EOPNOTSUPP;
3090         } else if ((disk_offset & HAMMER_BUFMASK) ||
3091                    (last_offset - ap->a_loffset) < blksize) {
3092                 /*
3093                  * doffsetp is not aligned or the forward run size does
3094                  * not cover a whole buffer, disallow the direct I/O.
3095                  */
3096                 error = EOPNOTSUPP;
3097         } else {
3098                 /*
3099                  * We're good.
3100                  */
3101                 *ap->a_doffsetp = disk_offset;
3102                 if (ap->a_runb) {
3103                         *ap->a_runb = ap->a_loffset - base_offset;
3104                         KKASSERT(*ap->a_runb >= 0);
3105                 }
3106                 if (ap->a_runp) {
3107                         *ap->a_runp = last_offset - ap->a_loffset;
3108                         KKASSERT(*ap->a_runp >= 0);
3109                 }
3110                 error = 0;
3111         }
3112         return(error);
3113 }
3114
3115 /*
3116  * Write to a regular file.   Because this is a strategy call the OS is
3117  * trying to actually get data onto the media.
3118  */
3119 static
3120 int
3121 hammer_vop_strategy_write(struct vop_strategy_args *ap)
3122 {
3123         hammer_record_t record;
3124         hammer_mount_t hmp;
3125         hammer_inode_t ip;
3126         struct bio *bio;
3127         struct buf *bp;
3128         int blksize;
3129         int bytes;
3130         int error;
3131
3132         bio = ap->a_bio;
3133         bp = bio->bio_buf;
3134         ip = ap->a_vp->v_data;
3135         hmp = ip->hmp;
3136
3137         blksize = hammer_blocksize(bio->bio_offset);
3138         KKASSERT(bp->b_bufsize == blksize);
3139
3140         if (ip->flags & HAMMER_INODE_RO) {
3141                 bp->b_error = EROFS;
3142                 bp->b_flags |= B_ERROR;
3143                 biodone(ap->a_bio);
3144                 return(EROFS);
3145         }
3146
3147         lwkt_gettoken(&hmp->fs_token);
3148
3149         /*
3150          * Interlock with inode destruction (no in-kernel or directory
3151          * topology visibility).  If we queue new IO while trying to
3152          * destroy the inode we can deadlock the vtrunc call in
3153          * hammer_inode_unloadable_check().
3154          *
3155          * Besides, there's no point flushing a bp associated with an
3156          * inode that is being destroyed on-media and has no kernel
3157          * references.
3158          */
3159         if ((ip->flags | ip->sync_flags) &
3160             (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) {
3161                 bp->b_resid = 0;
3162                 biodone(ap->a_bio);
3163                 lwkt_reltoken(&hmp->fs_token);
3164                 return(0);
3165         }
3166
3167         /*
3168          * Reserve space and issue a direct-write from the front-end.
3169          * NOTE: The direct_io code will hammer_bread/bcopy smaller
3170          * allocations.
3171          *
3172          * An in-memory record will be installed to reference the storage
3173          * until the flusher can get to it.
3174          *
3175          * Since we own the high level bio the front-end will not try to
3176          * do a direct-read until the write completes.
3177          *
3178          * NOTE: The only time we do not reserve a full-sized buffers
3179          * worth of data is if the file is small.  We do not try to
3180          * allocate a fragment (from the small-data zone) at the end of
3181          * an otherwise large file as this can lead to wildly separated
3182          * data.
3183          */
3184         KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0);
3185         KKASSERT(bio->bio_offset < ip->ino_data.size);
3186         if (bio->bio_offset || ip->ino_data.size > HAMMER_BUFSIZE / 2)
3187                 bytes = bp->b_bufsize;
3188         else
3189                 bytes = ((int)ip->ino_data.size + 15) & ~15;
3190
3191         record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data,
3192                                     bytes, &error);
3193
3194         /*
3195          * B_VFSFLAG1 indicates that a REDO_WRITE entry was generated
3196          * in hammer_vop_write().  We must flag the record so the proper
3197          * REDO_TERM_WRITE entry is generated during the flush.
3198          */
3199         if (record) {
3200                 if (bp->b_flags & B_VFSFLAG1) {
3201                         record->flags |= HAMMER_RECF_REDO;
3202                         bp->b_flags &= ~B_VFSFLAG1;
3203                 }
3204                 hammer_io_direct_write(hmp, bio, record);
3205                 if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs)
3206                         hammer_flush_inode(ip, 0);
3207         } else {
3208                 bp->b_bio2.bio_offset = NOOFFSET;
3209                 bp->b_error = error;
3210                 bp->b_flags |= B_ERROR;
3211                 biodone(ap->a_bio);
3212         }
3213         lwkt_reltoken(&hmp->fs_token);
3214         return(error);
3215 }
3216
3217 /*
3218  * dounlink - disconnect a directory entry
3219  *
3220  * XXX whiteout support not really in yet
3221  */
3222 static int
3223 hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch,
3224                 struct vnode *dvp, struct ucred *cred,
3225                 int flags, int isdir)
3226 {
3227         struct namecache *ncp;
3228         hammer_inode_t dip;
3229         hammer_inode_t ip;
3230         hammer_mount_t hmp;
3231         struct hammer_cursor cursor;
3232         int64_t namekey;
3233         u_int32_t max_iterations;
3234         int nlen, error;
3235
3236         /*
3237          * Calculate the namekey and setup the key range for the scan.  This
3238          * works kinda like a chained hash table where the lower 32 bits
3239          * of the namekey synthesize the chain.
3240          *
3241          * The key range is inclusive of both key_beg and key_end.
3242          */
3243         dip = VTOI(dvp);
3244         ncp = nch->ncp;
3245         hmp = dip->hmp;
3246
3247         if (dip->flags & HAMMER_INODE_RO)
3248                 return (EROFS);
3249
3250         namekey = hammer_directory_namekey(dip, ncp->nc_name, ncp->nc_nlen,
3251                                            &max_iterations);
3252 retry:
3253         hammer_init_cursor(trans, &cursor, &dip->cache[1], dip);
3254         cursor.key_beg.localization = dip->obj_localization +
3255                                       hammer_dir_localization(dip);
3256         cursor.key_beg.obj_id = dip->obj_id;
3257         cursor.key_beg.key = namekey;
3258         cursor.key_beg.create_tid = 0;
3259         cursor.key_beg.delete_tid = 0;
3260         cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
3261         cursor.key_beg.obj_type = 0;
3262
3263         cursor.key_end = cursor.key_beg;
3264         cursor.key_end.key += max_iterations;
3265         cursor.asof = dip->obj_asof;
3266         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
3267
3268         /*
3269          * Scan all matching records (the chain), locate the one matching
3270          * the requested path component.  info->last_error contains the
3271          * error code on search termination and could be 0, ENOENT, or
3272          * something else.
3273          *
3274          * The hammer_ip_*() functions merge in-memory records with on-disk
3275          * records for the purposes of the search.
3276          */
3277         error = hammer_ip_first(&cursor);
3278
3279         while (error == 0) {
3280                 error = hammer_ip_resolve_data(&cursor);
3281                 if (error)
3282                         break;
3283                 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
3284                 KKASSERT(nlen > 0);
3285                 if (ncp->nc_nlen == nlen &&
3286                     bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
3287                         break;
3288                 }
3289                 error = hammer_ip_next(&cursor);
3290         }
3291
3292         /*
3293          * If all is ok we have to get the inode so we can adjust nlinks.
3294          * To avoid a deadlock with the flusher we must release the inode
3295          * lock on the directory when acquiring the inode for the entry.
3296          *
3297          * If the target is a directory, it must be empty.
3298          */
3299         if (error == 0) {
3300                 hammer_unlock(&cursor.ip->lock);
3301                 ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id,
3302                                       hmp->asof,
3303                                       cursor.data->entry.localization,
3304                                       0, &error);
3305                 hammer_lock_sh(&cursor.ip->lock);
3306                 if (error == ENOENT) {
3307                         kprintf("HAMMER: WARNING: Removing "
3308                                 "dirent w/missing inode \"%s\"\n"
3309                                 "\tobj_id = %016llx\n",
3310                                 ncp->nc_name,
3311                                 (long long)cursor.data->entry.obj_id);
3312                         error = 0;
3313                 }
3314
3315                 /*
3316                  * If isdir >= 0 we validate that the entry is or is not a
3317                  * directory.  If isdir < 0 we don't care.
3318                  */
3319                 if (error == 0 && isdir >= 0 && ip) {
3320                         if (isdir &&
3321                             ip->ino_data.obj_type != HAMMER_OBJTYPE_DIRECTORY) {
3322                                 error = ENOTDIR;
3323                         } else if (isdir == 0 &&
3324                             ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY) {
3325                                 error = EISDIR;
3326                         }
3327                 }
3328
3329                 /*
3330                  * If we are trying to remove a directory the directory must
3331                  * be empty.
3332                  *
3333                  * The check directory code can loop and deadlock/retry.  Our
3334                  * own cursor's node locks must be released to avoid a 3-way
3335                  * deadlock with the flusher if the check directory code
3336                  * blocks.
3337                  *
3338                  * If any changes whatsoever have been made to the cursor
3339                  * set EDEADLK and retry.
3340                  *
3341                  * WARNING: See warnings in hammer_unlock_cursor()
3342                  *          function.
3343                  */
3344                 if (error == 0 && ip && ip->ino_data.obj_type ==
3345                                         HAMMER_OBJTYPE_DIRECTORY) {
3346                         hammer_unlock_cursor(&cursor);
3347                         error = hammer_ip_check_directory_empty(trans, ip);
3348                         hammer_lock_cursor(&cursor);
3349                         if (cursor.flags & HAMMER_CURSOR_RETEST) {
3350                                 kprintf("HAMMER: Warning: avoided deadlock "
3351                                         "on rmdir '%s'\n",
3352                                         ncp->nc_name);
3353                                 error = EDEADLK;
3354                         }
3355                 }
3356
3357                 /*
3358                  * Delete the directory entry.
3359                  *
3360                  * WARNING: hammer_ip_del_directory() may have to terminate
3361                  * the cursor to avoid a deadlock.  It is ok to call
3362                  * hammer_done_cursor() twice.
3363                  */
3364                 if (error == 0) {
3365                         error = hammer_ip_del_directory(trans, &cursor,
3366                                                         dip, ip);
3367                 }
3368                 hammer_done_cursor(&cursor);
3369                 if (error == 0) {
3370                         cache_setunresolved(nch);
3371                         cache_setvp(nch, NULL);
3372
3373                         /*
3374                          * XXX locking.  Note: ip->vp might get ripped out
3375                          * when we setunresolved() the nch since we had
3376                          * no other reference to it.  In that case ip->vp
3377                          * will be NULL.
3378                          */
3379                         if (ip && ip->vp) {
3380                                 hammer_knote(ip->vp, NOTE_DELETE);
3381                                 cache_inval_vp(ip->vp, CINV_DESTROY);
3382                         }
3383                 }
3384                 if (ip)
3385                         hammer_rel_inode(ip, 0);
3386         } else {
3387                 hammer_done_cursor(&cursor);
3388         }
3389         if (error == EDEADLK)
3390                 goto retry;
3391
3392         return (error);
3393 }
3394
3395 /************************************************************************
3396  *                          FIFO AND SPECFS OPS                         *
3397  ************************************************************************
3398  *
3399  */
3400 static int
3401 hammer_vop_fifoclose (struct vop_close_args *ap)
3402 {
3403         /* XXX update itimes */
3404         return (VOCALL(&fifo_vnode_vops, &ap->a_head));
3405 }
3406
3407 static int
3408 hammer_vop_fiforead (struct vop_read_args *ap)
3409 {
3410         int error;
3411
3412         error = VOCALL(&fifo_vnode_vops, &ap->a_head);
3413         /* XXX update access time */
3414         return (error);
3415 }
3416
3417 static int
3418 hammer_vop_fifowrite (struct vop_write_args *ap)
3419 {
3420         int error;
3421
3422         error = VOCALL(&fifo_vnode_vops, &ap->a_head);
3423         /* XXX update access time */
3424         return (error);
3425 }
3426
3427 static
3428 int
3429 hammer_vop_fifokqfilter(struct vop_kqfilter_args *ap)
3430 {
3431         int error;
3432
3433         error = VOCALL(&fifo_vnode_vops, &ap->a_head);
3434         if (error)
3435                 error = hammer_vop_kqfilter(ap);
3436         return(error);
3437 }
3438
3439 /************************************************************************
3440  *                          KQFILTER OPS                                *
3441  ************************************************************************
3442  *
3443  */
3444 static void filt_hammerdetach(struct knote *kn);
3445 static int filt_hammerread(struct knote *kn, long hint);
3446 static int filt_hammerwrite(struct knote *kn, long hint);
3447 static int filt_hammervnode(struct knote *kn, long hint);
3448
3449 static struct filterops hammerread_filtops =
3450         { FILTEROP_ISFD, NULL, filt_hammerdetach, filt_hammerread };
3451 static struct filterops hammerwrite_filtops =
3452         { FILTEROP_ISFD, NULL, filt_hammerdetach, filt_hammerwrite };
3453 static struct filterops hammervnode_filtops =
3454         { FILTEROP_ISFD, NULL, filt_hammerdetach, filt_hammervnode };
3455
3456 static
3457 int
3458 hammer_vop_kqfilter(struct vop_kqfilter_args *ap)
3459 {
3460         struct vnode *vp = ap->a_vp;
3461         struct knote *kn = ap->a_kn;
3462
3463         switch (kn->kn_filter) {
3464         case EVFILT_READ:
3465                 kn->kn_fop = &hammerread_filtops;
3466                 break;
3467         case EVFILT_WRITE:
3468                 kn->kn_fop = &hammerwrite_filtops;
3469                 break;
3470         case EVFILT_VNODE:
3471                 kn->kn_fop = &hammervnode_filtops;
3472                 break;
3473         default:
3474                 return (EOPNOTSUPP);
3475         }
3476
3477         kn->kn_hook = (caddr_t)vp;
3478
3479         knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
3480
3481         return(0);
3482 }
3483
3484 static void
3485 filt_hammerdetach(struct knote *kn)
3486 {
3487         struct vnode *vp = (void *)kn->kn_hook;
3488
3489         knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
3490 }
3491
3492 static int
3493 filt_hammerread(struct knote *kn, long hint)
3494 {
3495         struct vnode *vp = (void *)kn->kn_hook;
3496         hammer_inode_t ip = VTOI(vp);
3497         hammer_mount_t hmp = ip->hmp;
3498         off_t off;
3499
3500         if (hint == NOTE_REVOKE) {
3501                 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
3502                 return(1);
3503         }
3504         lwkt_gettoken(&hmp->fs_token);  /* XXX use per-ip-token */
3505         off = ip->ino_data.size - kn->kn_fp->f_offset;
3506         kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX;
3507         lwkt_reltoken(&hmp->fs_token);
3508         if (kn->kn_sfflags & NOTE_OLDAPI)
3509                 return(1);
3510         return (kn->kn_data != 0);
3511 }
3512
3513 static int
3514 filt_hammerwrite(struct knote *kn, long hint)
3515 {
3516         if (hint == NOTE_REVOKE)
3517                 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
3518         kn->kn_data = 0;
3519         return (1);
3520 }
3521
3522 static int
3523 filt_hammervnode(struct knote *kn, long hint)
3524 {
3525         if (kn->kn_sfflags & hint)
3526                 kn->kn_fflags |= hint;
3527         if (hint == NOTE_REVOKE) {
3528                 kn->kn_flags |= EV_EOF;
3529                 return (1);
3530         }
3531         return (kn->kn_fflags != 0);
3532 }
3533