sys/vfs/hammer/hammer_vnops.c

   1 /*
   2  * Copyright (c) 2007 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 1.27 2008/02/05 20:52:01 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 <vm/vm_extern.h>
  48 #include <vfs/fifofs/fifo.h>
  49 #include "hammer.h"
  50
  51 /*
  52  * USERFS VNOPS
  53  */
  54 /*static int hammer_vop_vnoperate(struct vop_generic_args *);*/
  55 static int hammer_vop_fsync(struct vop_fsync_args *);
  56 static int hammer_vop_read(struct vop_read_args *);
  57 static int hammer_vop_write(struct vop_write_args *);
  58 static int hammer_vop_access(struct vop_access_args *);
  59 static int hammer_vop_advlock(struct vop_advlock_args *);
  60 static int hammer_vop_close(struct vop_close_args *);
  61 static int hammer_vop_ncreate(struct vop_ncreate_args *);
  62 static int hammer_vop_getattr(struct vop_getattr_args *);
  63 static int hammer_vop_nresolve(struct vop_nresolve_args *);
  64 static int hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *);
  65 static int hammer_vop_nlink(struct vop_nlink_args *);
  66 static int hammer_vop_nmkdir(struct vop_nmkdir_args *);
  67 static int hammer_vop_nmknod(struct vop_nmknod_args *);
  68 static int hammer_vop_open(struct vop_open_args *);
  69 static int hammer_vop_pathconf(struct vop_pathconf_args *);
  70 static int hammer_vop_print(struct vop_print_args *);
  71 static int hammer_vop_readdir(struct vop_readdir_args *);
  72 static int hammer_vop_readlink(struct vop_readlink_args *);
  73 static int hammer_vop_nremove(struct vop_nremove_args *);
  74 static int hammer_vop_nrename(struct vop_nrename_args *);
  75 static int hammer_vop_nrmdir(struct vop_nrmdir_args *);
  76 static int hammer_vop_setattr(struct vop_setattr_args *);
  77 static int hammer_vop_strategy(struct vop_strategy_args *);
  78 static int hammer_vop_nsymlink(struct vop_nsymlink_args *);
  79 static int hammer_vop_nwhiteout(struct vop_nwhiteout_args *);
  80 static int hammer_vop_ioctl(struct vop_ioctl_args *);
  81 static int hammer_vop_mountctl(struct vop_mountctl_args *);
  82
  83 static int hammer_vop_fifoclose (struct vop_close_args *);
  84 static int hammer_vop_fiforead (struct vop_read_args *);
  85 static int hammer_vop_fifowrite (struct vop_write_args *);
  86
  87 static int hammer_vop_specclose (struct vop_close_args *);
  88 static int hammer_vop_specread (struct vop_read_args *);
  89 static int hammer_vop_specwrite (struct vop_write_args *);
  90
  91 struct vop_ops hammer_vnode_vops = {
  92         .vop_default =          vop_defaultop,
  93         .vop_fsync =            hammer_vop_fsync,
  94         .vop_getpages =         vop_stdgetpages,
  95         .vop_putpages =         vop_stdputpages,
  96         .vop_read =             hammer_vop_read,
  97         .vop_write =            hammer_vop_write,
  98         .vop_access =           hammer_vop_access,
  99         .vop_advlock =          hammer_vop_advlock,
 100         .vop_close =            hammer_vop_close,
 101         .vop_ncreate =          hammer_vop_ncreate,
 102         .vop_getattr =          hammer_vop_getattr,
 103         .vop_inactive =         hammer_vop_inactive,
 104         .vop_reclaim =          hammer_vop_reclaim,
 105         .vop_nresolve =         hammer_vop_nresolve,
 106         .vop_nlookupdotdot =    hammer_vop_nlookupdotdot,
 107         .vop_nlink =            hammer_vop_nlink,
 108         .vop_nmkdir =           hammer_vop_nmkdir,
 109         .vop_nmknod =           hammer_vop_nmknod,
 110         .vop_open =             hammer_vop_open,
 111         .vop_pathconf =         hammer_vop_pathconf,
 112         .vop_print =            hammer_vop_print,
 113         .vop_readdir =          hammer_vop_readdir,
 114         .vop_readlink =         hammer_vop_readlink,
 115         .vop_nremove =          hammer_vop_nremove,
 116         .vop_nrename =          hammer_vop_nrename,
 117         .vop_nrmdir =           hammer_vop_nrmdir,
 118         .vop_setattr =          hammer_vop_setattr,
 119         .vop_strategy =         hammer_vop_strategy,
 120         .vop_nsymlink =         hammer_vop_nsymlink,
 121         .vop_nwhiteout =        hammer_vop_nwhiteout,
 122         .vop_ioctl =            hammer_vop_ioctl,
 123         .vop_mountctl =         hammer_vop_mountctl
 124 };
 125
 126 struct vop_ops hammer_spec_vops = {
 127         .vop_default =          spec_vnoperate,
 128         .vop_fsync =            hammer_vop_fsync,
 129         .vop_read =             hammer_vop_specread,
 130         .vop_write =            hammer_vop_specwrite,
 131         .vop_access =           hammer_vop_access,
 132         .vop_close =            hammer_vop_specclose,
 133         .vop_getattr =          hammer_vop_getattr,
 134         .vop_inactive =         hammer_vop_inactive,
 135         .vop_reclaim =          hammer_vop_reclaim,
 136         .vop_setattr =          hammer_vop_setattr
 137 };
 138
 139 struct vop_ops hammer_fifo_vops = {
 140         .vop_default =          fifo_vnoperate,
 141         .vop_fsync =            hammer_vop_fsync,
 142         .vop_read =             hammer_vop_fiforead,
 143         .vop_write =            hammer_vop_fifowrite,
 144         .vop_access =           hammer_vop_access,
 145         .vop_close =            hammer_vop_fifoclose,
 146         .vop_getattr =          hammer_vop_getattr,
 147         .vop_inactive =         hammer_vop_inactive,
 148         .vop_reclaim =          hammer_vop_reclaim,
 149         .vop_setattr =          hammer_vop_setattr
 150 };
 151
 152 static int hammer_dounlink(struct nchandle *nch, struct vnode *dvp,
 153                            struct ucred *cred, int flags);
 154 static int hammer_vop_strategy_read(struct vop_strategy_args *ap);
 155 static int hammer_vop_strategy_write(struct vop_strategy_args *ap);
 156
 157 #if 0
 158 static
 159 int
 160 hammer_vop_vnoperate(struct vop_generic_args *)
 161 {
 162         return (VOCALL(&hammer_vnode_vops, ap));
 163 }
 164 #endif
 165
 166 /*
 167  * hammer_vop_fsync { vp, waitfor }
 168  */
 169 static
 170 int
 171 hammer_vop_fsync(struct vop_fsync_args *ap)
 172 {
 173         hammer_inode_t ip;
 174         int error;
 175
 176         ip = VTOI(ap->a_vp);
 177         error = hammer_sync_inode(ip, ap->a_waitfor, 0);
 178         return (error);
 179 }
 180
 181 /*
 182  * hammer_vop_read { vp, uio, ioflag, cred }
 183  */
 184 static
 185 int
 186 hammer_vop_read(struct vop_read_args *ap)
 187 {
 188         struct hammer_transaction trans;
 189         hammer_inode_t ip;
 190         off_t offset;
 191         struct buf *bp;
 192         struct uio *uio;
 193         int error;
 194         int n;
 195         int seqcount;
 196
 197         if (ap->a_vp->v_type != VREG)
 198                 return (EINVAL);
 199         ip = VTOI(ap->a_vp);
 200         error = 0;
 201         seqcount = ap->a_ioflag >> 16;
 202
 203         hammer_start_transaction(&trans, ip->hmp);
 204
 205         /*
 206          * Access the data in HAMMER_BUFSIZE blocks via the buffer cache.
 207          */
 208         uio = ap->a_uio;
 209         while (uio->uio_resid > 0 && uio->uio_offset < ip->ino_rec.ino_size) {
 210                 offset = uio->uio_offset & HAMMER_BUFMASK;
 211 #if 0
 212                 error = cluster_read(ap->a_vp, ip->ino_rec.ino_size,
 213                                      uio->uio_offset - offset, HAMMER_BUFSIZE,
 214                                      MAXBSIZE, seqcount, &bp);
 215 #endif
 216                 error = bread(ap->a_vp, uio->uio_offset - offset,
 217                               HAMMER_BUFSIZE, &bp);
 218                 if (error) {
 219                         brelse(bp);
 220                         break;
 221                 }
 222                 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
 223                 n = HAMMER_BUFSIZE - offset;
 224                 if (n > uio->uio_resid)
 225                         n = uio->uio_resid;
 226                 if (n > ip->ino_rec.ino_size - uio->uio_offset)
 227                         n = (int)(ip->ino_rec.ino_size - uio->uio_offset);
 228                 error = uiomove((char *)bp->b_data + offset, n, uio);
 229                 if (error) {
 230                         bqrelse(bp);
 231                         break;
 232                 }
 233                 if ((ip->flags & HAMMER_INODE_RO) == 0) {
 234                         ip->ino_rec.ino_atime = trans.tid;
 235                         hammer_modify_inode(&trans, ip, HAMMER_INODE_ITIMES);
 236                 }
 237                 bqrelse(bp);
 238         }
 239         hammer_commit_transaction(&trans);
 240         return (error);
 241 }
 242
 243 /*
 244  * hammer_vop_write { vp, uio, ioflag, cred }
 245  */
 246 static
 247 int
 248 hammer_vop_write(struct vop_write_args *ap)
 249 {
 250         struct hammer_transaction trans;
 251         struct hammer_inode *ip;
 252         struct uio *uio;
 253         off_t offset;
 254         struct buf *bp;
 255         int error;
 256         int n;
 257         int flags;
 258
 259         if (ap->a_vp->v_type != VREG)
 260                 return (EINVAL);
 261         ip = VTOI(ap->a_vp);
 262         error = 0;
 263
 264         if (ip->flags & HAMMER_INODE_RO)
 265                 return (EROFS);
 266
 267         /*
 268          * Create a transaction to cover the operations we perform.
 269          */
 270         hammer_start_transaction(&trans, ip->hmp);
 271         uio = ap->a_uio;
 272
 273         /*
 274          * Check append mode
 275          */
 276         if (ap->a_ioflag & IO_APPEND)
 277                 uio->uio_offset = ip->ino_rec.ino_size;
 278
 279         /*
 280          * Check for illegal write offsets.  Valid range is 0...2^63-1
 281          */
 282         if (uio->uio_offset < 0 || uio->uio_offset + uio->uio_resid <= 0) {
 283                 hammer_commit_transaction(&trans);
 284                 return (EFBIG);
 285         }
 286
 287         /*
 288          * Access the data in HAMMER_BUFSIZE blocks via the buffer cache.
 289          */
 290         while (uio->uio_resid > 0) {
 291                 int fixsize = 0;
 292
 293                 offset = uio->uio_offset & HAMMER_BUFMASK;
 294                 n = HAMMER_BUFSIZE - offset;
 295                 if (n > uio->uio_resid)
 296                         n = uio->uio_resid;
 297                 if (uio->uio_offset + n > ip->ino_rec.ino_size) {
 298                         vnode_pager_setsize(ap->a_vp, uio->uio_offset + n);
 299                         fixsize = 1;
 300                 }
 301
 302                 if (uio->uio_segflg == UIO_NOCOPY) {
 303                         /*
 304                          * Issuing a write with the same data backing the
 305                          * buffer.  Instantiate the buffer to collect the
 306                          * backing vm pages, then read-in any missing bits.
 307                          *
 308                          * This case is used by vop_stdputpages().
 309                          */
 310                         bp = getblk(ap->a_vp, uio->uio_offset - offset,
 311                                     HAMMER_BUFSIZE, GETBLK_BHEAVY, 0);
 312                         if ((bp->b_flags & B_CACHE) == 0) {
 313                                 bqrelse(bp);
 314                                 error = bread(ap->a_vp,
 315                                               uio->uio_offset - offset,
 316                                               HAMMER_BUFSIZE, &bp);
 317                         }
 318                 } else if (offset == 0 && uio->uio_resid >= HAMMER_BUFSIZE) {
 319                         /*
 320                          * entirely overwrite the buffer
 321                          */
 322                         bp = getblk(ap->a_vp, uio->uio_offset - offset,
 323                                     HAMMER_BUFSIZE, GETBLK_BHEAVY, 0);
 324                 } else if (offset == 0 && uio->uio_offset >= ip->ino_rec.ino_size) {
 325                         /*
 326                          * XXX
 327                          */
 328                         bp = getblk(ap->a_vp, uio->uio_offset - offset,
 329                                     HAMMER_BUFSIZE, GETBLK_BHEAVY, 0);
 330                         vfs_bio_clrbuf(bp);
 331                 } else {
 332                         /*
 333                          * Partial overwrite, read in any missing bits then
 334                          * replace the portion being written.
 335                          */
 336                         error = bread(ap->a_vp, uio->uio_offset - offset,
 337                                       HAMMER_BUFSIZE, &bp);
 338                         if (error == 0)
 339                                 bheavy(bp);
 340                 }
 341                 if (error == 0)
 342                         error = uiomove((char *)bp->b_data + offset, n, uio);
 343
 344                 /*
 345                  * If we screwed up we have to undo any VM size changes we
 346                  * made.
 347                  */
 348                 if (error) {
 349                         brelse(bp);
 350                         if (fixsize) {
 351                                 vtruncbuf(ap->a_vp, ip->ino_rec.ino_size,
 352                                           HAMMER_BUFSIZE);
 353                         }
 354                         break;
 355                 }
 356                 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
 357                 if (ip->ino_rec.ino_size < uio->uio_offset) {
 358                         ip->ino_rec.ino_size = uio->uio_offset;
 359                         flags = HAMMER_INODE_RDIRTY;
 360                         vnode_pager_setsize(ap->a_vp, ip->ino_rec.ino_size);
 361                 } else {
 362                         flags = 0;
 363                 }
 364                 ip->ino_rec.ino_mtime = trans.tid;
 365                 flags |= HAMMER_INODE_ITIMES | HAMMER_INODE_BUFS;
 366                 hammer_modify_inode(&trans, ip, flags);
 367
 368                 /*
 369                  * The file write must be tagged with the same TID as the
 370                  * inode, for consistency in case the inode changed size.
 371                  * This guarantees the on-disk data records will have a
 372                  * TID <= the inode TID representing the size change.
 373                  *
 374                  * If a prior write has not yet flushed, retain its TID.
 375                  */
 376                 if (bp->b_tid == 0)
 377                         bp->b_tid = ip->last_tid;
 378
 379                 if (ap->a_ioflag & IO_SYNC) {
 380                         bwrite(bp);
 381                 } else if (ap->a_ioflag & IO_DIRECT) {
 382                         bawrite(bp);
 383                 } else {
 384                         bdwrite(bp);
 385                 }
 386         }
 387         if (error)
 388                 hammer_abort_transaction(&trans);
 389         else
 390                 hammer_commit_transaction(&trans);
 391         return (error);
 392 }
 393
 394 /*
 395  * hammer_vop_access { vp, mode, cred }
 396  */
 397 static
 398 int
 399 hammer_vop_access(struct vop_access_args *ap)
 400 {
 401         struct hammer_inode *ip = VTOI(ap->a_vp);
 402         uid_t uid;
 403         gid_t gid;
 404         int error;
 405
 406         uid = hammer_to_unix_xid(&ip->ino_data.uid);
 407         gid = hammer_to_unix_xid(&ip->ino_data.gid);
 408
 409         error = vop_helper_access(ap, uid, gid, ip->ino_data.mode,
 410                                   ip->ino_data.uflags);
 411         return (error);
 412 }
 413
 414 /*
 415  * hammer_vop_advlock { vp, id, op, fl, flags }
 416  */
 417 static
 418 int
 419 hammer_vop_advlock(struct vop_advlock_args *ap)
 420 {
 421         struct hammer_inode *ip = VTOI(ap->a_vp);
 422
 423         return (lf_advlock(ap, &ip->advlock, ip->ino_rec.ino_size));
 424 }
 425
 426 /*
 427  * hammer_vop_close { vp, fflag }
 428  */
 429 static
 430 int
 431 hammer_vop_close(struct vop_close_args *ap)
 432 {
 433         return (vop_stdclose(ap));
 434 }
 435
 436 /*
 437  * hammer_vop_ncreate { nch, dvp, vpp, cred, vap }
 438  *
 439  * The operating system has already ensured that the directory entry
 440  * does not exist and done all appropriate namespace locking.
 441  */
 442 static
 443 int
 444 hammer_vop_ncreate(struct vop_ncreate_args *ap)
 445 {
 446         struct hammer_transaction trans;
 447         struct hammer_inode *dip;
 448         struct hammer_inode *nip;
 449         struct nchandle *nch;
 450         int error;
 451
 452         nch = ap->a_nch;
 453         dip = VTOI(ap->a_dvp);
 454
 455         if (dip->flags & HAMMER_INODE_RO)
 456                 return (EROFS);
 457
 458         /*
 459          * Create a transaction to cover the operations we perform.
 460          */
 461         hammer_start_transaction(&trans, dip->hmp);
 462
 463         /*
 464          * Create a new filesystem object of the requested type.  The
 465          * returned inode will be referenced but not locked.
 466          */
 467
 468         error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, dip, &nip);
 469         if (error)
 470                 kprintf("hammer_create_inode error %d\n", error);
 471         if (error) {
 472                 hammer_abort_transaction(&trans);
 473                 *ap->a_vpp = NULL;
 474                 return (error);
 475         }
 476
 477         /*
 478          * Add the new filesystem object to the directory.  This will also
 479          * bump the inode's link count.
 480          */
 481         error = hammer_ip_add_directory(&trans, dip, nch->ncp, nip);
 482         if (error)
 483                 kprintf("hammer_ip_add_directory error %d\n", error);
 484
 485         /*
 486          * Finish up.
 487          */
 488         if (error) {
 489                 hammer_rel_inode(nip, 0);
 490                 hammer_abort_transaction(&trans);
 491                 *ap->a_vpp = NULL;
 492         } else {
 493                 hammer_commit_transaction(&trans);
 494                 error = hammer_get_vnode(nip, LK_EXCLUSIVE, ap->a_vpp);
 495                 hammer_rel_inode(nip, 0);
 496                 if (error == 0) {
 497                         cache_setunresolved(ap->a_nch);
 498                         cache_setvp(ap->a_nch, *ap->a_vpp);
 499                 }
 500         }
 501         return (error);
 502 }
 503
 504 /*
 505  * hammer_vop_getattr { vp, vap }
 506  */
 507 static
 508 int
 509 hammer_vop_getattr(struct vop_getattr_args *ap)
 510 {
 511         struct hammer_inode *ip = VTOI(ap->a_vp);
 512         struct vattr *vap = ap->a_vap;
 513
 514 #if 0
 515         if (cache_check_fsmid_vp(ap->a_vp, &ip->fsmid) &&
 516             (vp->v_mount->mnt_flag & MNT_RDONLY) == 0 &&
 517             ip->obj_asof == XXX
 518         ) {
 519                 /* LAZYMOD XXX */
 520         }
 521         hammer_itimes(ap->a_vp);
 522 #endif
 523
 524         vap->va_fsid = ip->hmp->fsid_udev;
 525         vap->va_fileid = ip->ino_rec.base.base.obj_id;
 526         vap->va_mode = ip->ino_data.mode;
 527         vap->va_nlink = ip->ino_rec.ino_nlinks;
 528         vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid);
 529         vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid);
 530         vap->va_rmajor = 0;
 531         vap->va_rminor = 0;
 532         vap->va_size = ip->ino_rec.ino_size;
 533         hammer_to_timespec(ip->ino_rec.ino_atime, &vap->va_atime);
 534         hammer_to_timespec(ip->ino_rec.ino_mtime, &vap->va_mtime);
 535         hammer_to_timespec(ip->ino_data.ctime, &vap->va_ctime);
 536         vap->va_flags = ip->ino_data.uflags;
 537         vap->va_gen = 1;        /* hammer inums are unique for all time */
 538         vap->va_blocksize = 32768; /* XXX - extract from root volume */
 539         vap->va_bytes = ip->ino_rec.ino_size;
 540         vap->va_type = hammer_get_vnode_type(ip->ino_rec.base.base.obj_type);
 541         vap->va_filerev = 0;    /* XXX */
 542         /* mtime uniquely identifies any adjustments made to the file */
 543         vap->va_fsmid = ip->ino_rec.ino_mtime;
 544         vap->va_uid_uuid = ip->ino_data.uid;
 545         vap->va_gid_uuid = ip->ino_data.gid;
 546         vap->va_fsid_uuid = ip->hmp->fsid;
 547         vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID |
 548                           VA_FSID_UUID_VALID;
 549
 550         switch (ip->ino_rec.base.base.obj_type) {
 551         case HAMMER_OBJTYPE_CDEV:
 552         case HAMMER_OBJTYPE_BDEV:
 553                 vap->va_rmajor = ip->ino_data.rmajor;
 554                 vap->va_rminor = ip->ino_data.rminor;
 555                 break;
 556         default:
 557                 break;
 558         }
 559
 560         return(0);
 561 }
 562
 563 /*
 564  * hammer_vop_nresolve { nch, dvp, cred }
 565  *
 566  * Locate the requested directory entry.
 567  */
 568 static
 569 int
 570 hammer_vop_nresolve(struct vop_nresolve_args *ap)
 571 {
 572         struct namecache *ncp;
 573         hammer_inode_t dip;
 574         hammer_inode_t ip;
 575         hammer_tid_t asof;
 576         struct hammer_cursor cursor;
 577         union hammer_record_ondisk *rec;
 578         struct vnode *vp;
 579         int64_t namekey;
 580         int error;
 581         int i;
 582         int nlen;
 583         int flags;
 584         u_int64_t obj_id;
 585
 586         /*
 587          * Misc initialization, plus handle as-of name extensions.  Look for
 588          * the '@@' extension.  Note that as-of files and directories cannot
 589          * be modified.
 590          */
 591         dip = VTOI(ap->a_dvp);
 592         ncp = ap->a_nch->ncp;
 593         asof = dip->obj_asof;
 594         nlen = ncp->nc_nlen;
 595         flags = dip->flags;
 596
 597         for (i = 0; i < nlen; ++i) {
 598                 if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') {
 599                         asof = hammer_str_to_tid(ncp->nc_name + i + 2);
 600                         flags |= HAMMER_INODE_RO;
 601                         break;
 602                 }
 603         }
 604         nlen = i;
 605
 606         /*
 607          * If there is no path component the time extension is relative to
 608          * dip.
 609          */
 610         if (nlen == 0) {
 611                 ip = hammer_get_inode(dip->hmp, &dip->cache[1], dip->obj_id,
 612                                       asof, flags, &error);
 613                 if (error == 0) {
 614                         error = hammer_get_vnode(ip, LK_EXCLUSIVE, &vp);
 615                         hammer_rel_inode(ip, 0);
 616                 } else {
 617                         vp = NULL;
 618                 }
 619                 if (error == 0) {
 620                         vn_unlock(vp);
 621                         cache_setvp(ap->a_nch, vp);
 622                         vrele(vp);
 623                 }
 624                 return(error);
 625         }
 626
 627         /*
 628          * Calculate the namekey and setup the key range for the scan.  This
 629          * works kinda like a chained hash table where the lower 32 bits
 630          * of the namekey synthesize the chain.
 631          *
 632          * The key range is inclusive of both key_beg and key_end.
 633          */
 634         namekey = hammer_directory_namekey(ncp->nc_name, nlen);
 635
 636         error = hammer_init_cursor_hmp(&cursor, &dip->cache[0], dip->hmp);
 637         cursor.key_beg.obj_id = dip->obj_id;
 638         cursor.key_beg.key = namekey;
 639         cursor.key_beg.create_tid = 0;
 640         cursor.key_beg.delete_tid = 0;
 641         cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
 642         cursor.key_beg.obj_type = 0;
 643
 644         cursor.key_end = cursor.key_beg;
 645         cursor.key_end.key |= 0xFFFFFFFFULL;
 646         cursor.asof = asof;
 647         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
 648
 649         /*
 650          * Scan all matching records (the chain), locate the one matching
 651          * the requested path component.
 652          *
 653          * The hammer_ip_*() functions merge in-memory records with on-disk
 654          * records for the purposes of the search.
 655          */
 656         if (error == 0)
 657                 error = hammer_ip_first(&cursor, dip);
 658
 659         rec = NULL;
 660         obj_id = 0;
 661
 662         while (error == 0) {
 663                 error = hammer_ip_resolve_data(&cursor);
 664                 if (error)
 665                         break;
 666                 rec = cursor.record;
 667                 if (nlen == rec->entry.base.data_len &&
 668                     bcmp(ncp->nc_name, cursor.data, nlen) == 0) {
 669                         obj_id = rec->entry.obj_id;
 670                         break;
 671                 }
 672                 error = hammer_ip_next(&cursor);
 673         }
 674         hammer_done_cursor(&cursor);
 675         if (error == 0) {
 676                 ip = hammer_get_inode(dip->hmp, &dip->cache[1],
 677                                       obj_id, asof, flags, &error);
 678                 if (error == 0) {
 679                         error = hammer_get_vnode(ip, LK_EXCLUSIVE, &vp);
 680                         hammer_rel_inode(ip, 0);
 681                 } else {
 682                         vp = NULL;
 683                 }
 684                 if (error == 0) {
 685                         vn_unlock(vp);
 686                         cache_setvp(ap->a_nch, vp);
 687                         vrele(vp);
 688                 }
 689         } else if (error == ENOENT) {
 690                 cache_setvp(ap->a_nch, NULL);
 691         }
 692         return (error);
 693 }
 694
 695 /*
 696  * hammer_vop_nlookupdotdot { dvp, vpp, cred }
 697  *
 698  * Locate the parent directory of a directory vnode.
 699  *
 700  * dvp is referenced but not locked.  *vpp must be returned referenced and
 701  * locked.  A parent_obj_id of 0 does not necessarily indicate that we are
 702  * at the root, instead it could indicate that the directory we were in was
 703  * removed.
 704  */
 705 static
 706 int
 707 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
 708 {
 709         struct hammer_inode *dip;
 710         struct hammer_inode *ip;
 711         u_int64_t parent_obj_id;
 712         int error;
 713
 714         dip = VTOI(ap->a_dvp);
 715         if ((parent_obj_id = dip->ino_data.parent_obj_id) == 0) {
 716                 *ap->a_vpp = NULL;
 717                 return ENOENT;
 718         }
 719
 720         ip = hammer_get_inode(dip->hmp, &dip->cache[1], parent_obj_id,
 721                               dip->obj_asof, dip->flags, &error);
 722         if (ip == NULL) {
 723                 *ap->a_vpp = NULL;
 724                 return(error);
 725         }
 726         error = hammer_get_vnode(ip, LK_EXCLUSIVE, ap->a_vpp);
 727         hammer_rel_inode(ip, 0);
 728         return (error);
 729 }
 730
 731 /*
 732  * hammer_vop_nlink { nch, dvp, vp, cred }
 733  */
 734 static
 735 int
 736 hammer_vop_nlink(struct vop_nlink_args *ap)
 737 {
 738         struct hammer_transaction trans;
 739         struct hammer_inode *dip;
 740         struct hammer_inode *ip;
 741         struct nchandle *nch;
 742         int error;
 743
 744         nch = ap->a_nch;
 745         dip = VTOI(ap->a_dvp);
 746         ip = VTOI(ap->a_vp);
 747
 748         if (dip->flags & HAMMER_INODE_RO)
 749                 return (EROFS);
 750         if (ip->flags & HAMMER_INODE_RO)
 751                 return (EROFS);
 752
 753         /*
 754          * Create a transaction to cover the operations we perform.
 755          */
 756         hammer_start_transaction(&trans, dip->hmp);
 757
 758         /*
 759          * Add the filesystem object to the directory.  Note that neither
 760          * dip nor ip are referenced or locked, but their vnodes are
 761          * referenced.  This function will bump the inode's link count.
 762          */
 763         error = hammer_ip_add_directory(&trans, dip, nch->ncp, ip);
 764
 765         /*
 766          * Finish up.
 767          */
 768         if (error) {
 769                 hammer_abort_transaction(&trans);
 770         } else {
 771                 cache_setunresolved(nch);
 772                 cache_setvp(nch, ap->a_vp);
 773                 hammer_commit_transaction(&trans);
 774         }
 775         return (error);
 776 }
 777
 778 /*
 779  * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap }
 780  *
 781  * The operating system has already ensured that the directory entry
 782  * does not exist and done all appropriate namespace locking.
 783  */
 784 static
 785 int
 786 hammer_vop_nmkdir(struct vop_nmkdir_args *ap)
 787 {
 788         struct hammer_transaction trans;
 789         struct hammer_inode *dip;
 790         struct hammer_inode *nip;
 791         struct nchandle *nch;
 792         int error;
 793
 794         nch = ap->a_nch;
 795         dip = VTOI(ap->a_dvp);
 796
 797         if (dip->flags & HAMMER_INODE_RO)
 798                 return (EROFS);
 799
 800         /*
 801          * Create a transaction to cover the operations we perform.
 802          */
 803         hammer_start_transaction(&trans, dip->hmp);
 804
 805         /*
 806          * Create a new filesystem object of the requested type.  The
 807          * returned inode will be referenced but not locked.
 808          */
 809         error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, dip, &nip);
 810         if (error)
 811                 kprintf("hammer_mkdir error %d\n", error);
 812         if (error) {
 813                 hammer_abort_transaction(&trans);
 814                 *ap->a_vpp = NULL;
 815                 return (error);
 816         }
 817
 818         /*
 819          * Add the new filesystem object to the directory.  This will also
 820          * bump the inode's link count.
 821          */
 822         error = hammer_ip_add_directory(&trans, dip, nch->ncp, nip);
 823         if (error)
 824                 kprintf("hammer_mkdir (add) error %d\n", error);
 825
 826         /*
 827          * Finish up.
 828          */
 829         if (error) {
 830                 hammer_rel_inode(nip, 0);
 831                 hammer_abort_transaction(&trans);
 832                 *ap->a_vpp = NULL;
 833         } else {
 834                 hammer_commit_transaction(&trans);
 835                 error = hammer_get_vnode(nip, LK_EXCLUSIVE, ap->a_vpp);
 836                 hammer_rel_inode(nip, 0);
 837                 if (error == 0) {
 838                         cache_setunresolved(ap->a_nch);
 839                         cache_setvp(ap->a_nch, *ap->a_vpp);
 840                 }
 841         }
 842         return (error);
 843 }
 844
 845 /*
 846  * hammer_vop_nmknod { nch, dvp, vpp, cred, vap }
 847  *
 848  * The operating system has already ensured that the directory entry
 849  * does not exist and done all appropriate namespace locking.
 850  */
 851 static
 852 int
 853 hammer_vop_nmknod(struct vop_nmknod_args *ap)
 854 {
 855         struct hammer_transaction trans;
 856         struct hammer_inode *dip;
 857         struct hammer_inode *nip;
 858         struct nchandle *nch;
 859         int error;
 860
 861         nch = ap->a_nch;
 862         dip = VTOI(ap->a_dvp);
 863
 864         if (dip->flags & HAMMER_INODE_RO)
 865                 return (EROFS);
 866
 867         /*
 868          * Create a transaction to cover the operations we perform.
 869          */
 870         hammer_start_transaction(&trans, dip->hmp);
 871
 872         /*
 873          * Create a new filesystem object of the requested type.  The
 874          * returned inode will be referenced but not locked.
 875          */
 876         error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, dip, &nip);
 877         if (error) {
 878                 hammer_abort_transaction(&trans);
 879                 *ap->a_vpp = NULL;
 880                 return (error);
 881         }
 882
 883         /*
 884          * Add the new filesystem object to the directory.  This will also
 885          * bump the inode's link count.
 886          */
 887         error = hammer_ip_add_directory(&trans, dip, nch->ncp, nip);
 888
 889         /*
 890          * Finish up.
 891          */
 892         if (error) {
 893                 hammer_rel_inode(nip, 0);
 894                 hammer_abort_transaction(&trans);
 895                 *ap->a_vpp = NULL;
 896         } else {
 897                 hammer_commit_transaction(&trans);
 898                 error = hammer_get_vnode(nip, LK_EXCLUSIVE, ap->a_vpp);
 899                 hammer_rel_inode(nip, 0);
 900                 if (error == 0) {
 901                         cache_setunresolved(ap->a_nch);
 902                         cache_setvp(ap->a_nch, *ap->a_vpp);
 903                 }
 904         }
 905         return (error);
 906 }
 907
 908 /*
 909  * hammer_vop_open { vp, mode, cred, fp }
 910  */
 911 static
 912 int
 913 hammer_vop_open(struct vop_open_args *ap)
 914 {
 915         if ((ap->a_mode & FWRITE) && (VTOI(ap->a_vp)->flags & HAMMER_INODE_RO))
 916                 return (EROFS);
 917
 918         return(vop_stdopen(ap));
 919 }
 920
 921 /*
 922  * hammer_vop_pathconf { vp, name, retval }
 923  */
 924 static
 925 int
 926 hammer_vop_pathconf(struct vop_pathconf_args *ap)
 927 {
 928         return EOPNOTSUPP;
 929 }
 930
 931 /*
 932  * hammer_vop_print { vp }
 933  */
 934 static
 935 int
 936 hammer_vop_print(struct vop_print_args *ap)
 937 {
 938         return EOPNOTSUPP;
 939 }
 940
 941 /*
 942  * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies }
 943  */
 944 static
 945 int
 946 hammer_vop_readdir(struct vop_readdir_args *ap)
 947 {
 948         struct hammer_cursor cursor;
 949         struct hammer_inode *ip;
 950         struct uio *uio;
 951         hammer_record_ondisk_t rec;
 952         hammer_base_elm_t base;
 953         int error;
 954         int cookie_index;
 955         int ncookies;
 956         off_t *cookies;
 957         off_t saveoff;
 958         int r;
 959
 960         ip = VTOI(ap->a_vp);
 961         uio = ap->a_uio;
 962         saveoff = uio->uio_offset;
 963
 964         if (ap->a_ncookies) {
 965                 ncookies = uio->uio_resid / 16 + 1;
 966                 if (ncookies > 1024)
 967                         ncookies = 1024;
 968                 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
 969                 cookie_index = 0;
 970         } else {
 971                 ncookies = -1;
 972                 cookies = NULL;
 973                 cookie_index = 0;
 974         }
 975
 976         /*
 977          * Handle artificial entries
 978          */
 979         error = 0;
 980         if (saveoff == 0) {
 981                 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, ".");
 982                 if (r)
 983                         goto done;
 984                 if (cookies)
 985                         cookies[cookie_index] = saveoff;
 986                 ++saveoff;
 987                 ++cookie_index;
 988                 if (cookie_index == ncookies)
 989                         goto done;
 990         }
 991         if (saveoff == 1) {
 992                 if (ip->ino_data.parent_obj_id) {
 993                         r = vop_write_dirent(&error, uio,
 994                                              ip->ino_data.parent_obj_id,
 995                                              DT_DIR, 2, "..");
 996                 } else {
 997                         r = vop_write_dirent(&error, uio,
 998                                              ip->obj_id, DT_DIR, 2, "..");
 999                 }
1000                 if (r)
1001                         goto done;
1002                 if (cookies)
1003                         cookies[cookie_index] = saveoff;
1004                 ++saveoff;
1005                 ++cookie_index;
1006                 if (cookie_index == ncookies)
1007                         goto done;
1008         }
1009
1010         /*
1011          * Key range (begin and end inclusive) to scan.  Directory keys
1012          * directly translate to a 64 bit 'seek' position.
1013          */
1014         hammer_init_cursor_hmp(&cursor, &ip->cache[0], ip->hmp);
1015         cursor.key_beg.obj_id = ip->obj_id;
1016         cursor.key_beg.create_tid = 0;
1017         cursor.key_beg.delete_tid = 0;
1018         cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1019         cursor.key_beg.obj_type = 0;
1020         cursor.key_beg.key = saveoff;
1021
1022         cursor.key_end = cursor.key_beg;
1023         cursor.key_end.key = HAMMER_MAX_KEY;
1024         cursor.asof = ip->obj_asof;
1025         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1026
1027         error = hammer_ip_first(&cursor, ip);
1028
1029         while (error == 0) {
1030                 error = hammer_ip_resolve_data(&cursor);
1031                 if (error)
1032                         break;
1033                 rec = cursor.record;
1034                 base = &rec->base.base;
1035                 saveoff = base->key;
1036
1037                 if (base->obj_id != ip->obj_id)
1038                         panic("readdir: bad record at %p", cursor.node);
1039
1040                 r = vop_write_dirent(
1041                              &error, uio, rec->entry.obj_id,
1042                              hammer_get_dtype(rec->entry.base.base.obj_type),
1043                              rec->entry.base.data_len,
1044                              (void *)cursor.data);
1045                 if (r)
1046                         break;
1047                 ++saveoff;
1048                 if (cookies)
1049                         cookies[cookie_index] = base->key;
1050                 ++cookie_index;
1051                 if (cookie_index == ncookies)
1052                         break;
1053                 error = hammer_ip_next(&cursor);
1054         }
1055         hammer_done_cursor(&cursor);
1056
1057 done:
1058         if (ap->a_eofflag)
1059                 *ap->a_eofflag = (error == ENOENT);
1060         uio->uio_offset = saveoff;
1061         if (error && cookie_index == 0) {
1062                 if (error == ENOENT)
1063                         error = 0;
1064                 if (cookies) {
1065                         kfree(cookies, M_TEMP);
1066                         *ap->a_ncookies = 0;
1067                         *ap->a_cookies = NULL;
1068                 }
1069         } else {
1070                 if (error == ENOENT)
1071                         error = 0;
1072                 if (cookies) {
1073                         *ap->a_ncookies = cookie_index;
1074                         *ap->a_cookies = cookies;
1075                 }
1076         }
1077         return(error);
1078 }
1079
1080 /*
1081  * hammer_vop_readlink { vp, uio, cred }
1082  */
1083 static
1084 int
1085 hammer_vop_readlink(struct vop_readlink_args *ap)
1086 {
1087         struct hammer_cursor cursor;
1088         struct hammer_inode *ip;
1089         int error;
1090
1091         ip = VTOI(ap->a_vp);
1092         hammer_init_cursor_hmp(&cursor, &ip->cache[0], ip->hmp);
1093
1094         /*
1095          * Key range (begin and end inclusive) to scan.  Directory keys
1096          * directly translate to a 64 bit 'seek' position.
1097          */
1098         cursor.key_beg.obj_id = ip->obj_id;
1099         cursor.key_beg.create_tid = 0;
1100         cursor.key_beg.delete_tid = 0;
1101         cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX;
1102         cursor.key_beg.obj_type = 0;
1103         cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK;
1104         cursor.asof = ip->obj_asof;
1105         cursor.flags |= HAMMER_CURSOR_ASOF;
1106
1107         error = hammer_ip_lookup(&cursor, ip);
1108         if (error == 0) {
1109                 error = hammer_ip_resolve_data(&cursor);
1110                 if (error == 0) {
1111                         error = uiomove((char *)cursor.data,
1112                                         cursor.record->generic.base.data_len,
1113                                         ap->a_uio);
1114                 }
1115         }
1116         hammer_done_cursor(&cursor);
1117         return(error);
1118 }
1119
1120 /*
1121  * hammer_vop_nremove { nch, dvp, cred }
1122  */
1123 static
1124 int
1125 hammer_vop_nremove(struct vop_nremove_args *ap)
1126 {
1127         return(hammer_dounlink(ap->a_nch, ap->a_dvp, ap->a_cred, 0));
1128 }
1129
1130 /*
1131  * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred }
1132  */
1133 static
1134 int
1135 hammer_vop_nrename(struct vop_nrename_args *ap)
1136 {
1137         struct hammer_transaction trans;
1138         struct namecache *fncp;
1139         struct namecache *tncp;
1140         struct hammer_inode *fdip;
1141         struct hammer_inode *tdip;
1142         struct hammer_inode *ip;
1143         struct hammer_cursor cursor;
1144         union hammer_record_ondisk *rec;
1145         int64_t namekey;
1146         int error;
1147
1148         fdip = VTOI(ap->a_fdvp);
1149         tdip = VTOI(ap->a_tdvp);
1150         fncp = ap->a_fnch->ncp;
1151         tncp = ap->a_tnch->ncp;
1152         ip = VTOI(fncp->nc_vp);
1153         KKASSERT(ip != NULL);
1154
1155         if (fdip->flags & HAMMER_INODE_RO)
1156                 return (EROFS);
1157         if (tdip->flags & HAMMER_INODE_RO)
1158                 return (EROFS);
1159         if (ip->flags & HAMMER_INODE_RO)
1160                 return (EROFS);
1161
1162         hammer_start_transaction(&trans, fdip->hmp);
1163
1164         /*
1165          * Remove tncp from the target directory and then link ip as
1166          * tncp. XXX pass trans to dounlink
1167          */
1168         error = hammer_dounlink(ap->a_tnch, ap->a_tdvp, ap->a_cred, 0);
1169         if (error == 0 || error == ENOENT)
1170                 error = hammer_ip_add_directory(&trans, tdip, tncp, ip);
1171         if (error)
1172                 goto failed; /* XXX */
1173
1174         /*
1175          * Locate the record in the originating directory and remove it.
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(fncp->nc_name, fncp->nc_nlen);
1184 retry:
1185         hammer_init_cursor_hmp(&cursor, &fdip->cache[0], fdip->hmp);
1186         cursor.key_beg.obj_id = fdip->obj_id;
1187         cursor.key_beg.key = namekey;
1188         cursor.key_beg.create_tid = 0;
1189         cursor.key_beg.delete_tid = 0;
1190         cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1191         cursor.key_beg.obj_type = 0;
1192
1193         cursor.key_end = cursor.key_beg;
1194         cursor.key_end.key |= 0xFFFFFFFFULL;
1195         cursor.asof = fdip->obj_asof;
1196         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1197
1198         /*
1199          * Scan all matching records (the chain), locate the one matching
1200          * the requested path component.
1201          *
1202          * The hammer_ip_*() functions merge in-memory records with on-disk
1203          * records for the purposes of the search.
1204          */
1205         error = hammer_ip_first(&cursor, fdip);
1206         while (error == 0) {
1207                 if (hammer_ip_resolve_data(&cursor) != 0)
1208                         break;
1209                 rec = cursor.record;
1210                 if (fncp->nc_nlen == rec->entry.base.data_len &&
1211                     bcmp(fncp->nc_name, cursor.data, fncp->nc_nlen) == 0) {
1212                         break;
1213                 }
1214                 error = hammer_ip_next(&cursor);
1215         }
1216
1217         /*
1218          * If all is ok we have to get the inode so we can adjust nlinks.
1219          *
1220          * WARNING: hammer_ip_del_directory() may have to terminate the
1221          * cursor to avoid a recursion.  It's ok to call hammer_done_cursor()
1222          * twice.
1223          */
1224         if (error == 0)
1225                 error = hammer_ip_del_directory(&trans, &cursor, fdip, ip);
1226         hammer_done_cursor(&cursor);
1227         if (error == 0)
1228                 cache_rename(ap->a_fnch, ap->a_tnch);
1229         if (error == EDEADLK)
1230                 goto retry;
1231 failed:
1232         if (error == 0) {
1233                 hammer_commit_transaction(&trans);
1234         } else {
1235                 hammer_abort_transaction(&trans);
1236         }
1237         return (error);
1238 }
1239
1240 /*
1241  * hammer_vop_nrmdir { nch, dvp, cred }
1242  */
1243 static
1244 int
1245 hammer_vop_nrmdir(struct vop_nrmdir_args *ap)
1246 {
1247         return(hammer_dounlink(ap->a_nch, ap->a_dvp, ap->a_cred, 0));
1248 }
1249
1250 /*
1251  * hammer_vop_setattr { vp, vap, cred }
1252  */
1253 static
1254 int
1255 hammer_vop_setattr(struct vop_setattr_args *ap)
1256 {
1257         struct hammer_transaction trans;
1258         struct hammer_cursor *spike = NULL;
1259         struct vattr *vap;
1260         struct hammer_inode *ip;
1261         int modflags;
1262         int error;
1263         int truncating;
1264         int64_t aligned_size;
1265         u_int32_t flags;
1266         uuid_t uuid;
1267
1268         vap = ap->a_vap;
1269         ip = ap->a_vp->v_data;
1270         modflags = 0;
1271
1272         if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
1273                 return(EROFS);
1274         if (ip->flags & HAMMER_INODE_RO)
1275                 return (EROFS);
1276
1277         hammer_start_transaction(&trans, ip->hmp);
1278         error = 0;
1279
1280         if (vap->va_flags != VNOVAL) {
1281                 flags = ip->ino_data.uflags;
1282                 error = vop_helper_setattr_flags(&flags, vap->va_flags,
1283                                          hammer_to_unix_xid(&ip->ino_data.uid),
1284                                          ap->a_cred);
1285                 if (error == 0) {
1286                         if (ip->ino_data.uflags != flags) {
1287                                 ip->ino_data.uflags = flags;
1288                                 modflags |= HAMMER_INODE_DDIRTY;
1289                         }
1290                         if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
1291                                 error = 0;
1292                                 goto done;
1293                         }
1294                 }
1295                 goto done;
1296         }
1297         if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
1298                 error = EPERM;
1299                 goto done;
1300         }
1301         if (vap->va_uid != (uid_t)VNOVAL) {
1302                 hammer_guid_to_uuid(&uuid, vap->va_uid);
1303                 if (bcmp(&uuid, &ip->ino_data.uid, sizeof(uuid)) != 0) {
1304                         ip->ino_data.uid = uuid;
1305                         modflags |= HAMMER_INODE_DDIRTY;
1306                 }
1307         }
1308         if (vap->va_gid != (uid_t)VNOVAL) {
1309                 hammer_guid_to_uuid(&uuid, vap->va_gid);
1310                 if (bcmp(&uuid, &ip->ino_data.gid, sizeof(uuid)) != 0) {
1311                         ip->ino_data.gid = uuid;
1312                         modflags |= HAMMER_INODE_DDIRTY;
1313                 }
1314         }
1315         while (vap->va_size != VNOVAL && ip->ino_rec.ino_size != vap->va_size) {
1316                 switch(ap->a_vp->v_type) {
1317                 case VREG:
1318                         if (vap->va_size == ip->ino_rec.ino_size)
1319                                 break;
1320                         if (vap->va_size < ip->ino_rec.ino_size) {
1321                                 vtruncbuf(ap->a_vp, vap->va_size,
1322                                           HAMMER_BUFSIZE);
1323                                 truncating = 1;
1324                         } else {
1325                                 vnode_pager_setsize(ap->a_vp, vap->va_size);
1326                                 truncating = 0;
1327                         }
1328                         ip->ino_rec.ino_size = vap->va_size;
1329                         modflags |= HAMMER_INODE_RDIRTY;
1330                         aligned_size = (vap->va_size + HAMMER_BUFMASK) &
1331                                         ~(int64_t)HAMMER_BUFMASK;
1332
1333                         if (truncating) {
1334                                 error = hammer_ip_delete_range(&trans, ip,
1335                                                     aligned_size,
1336                                                     0x7FFFFFFFFFFFFFFFLL,
1337                                                     &spike);
1338                         }
1339                         /*
1340                          * If truncating we have to clean out a portion of
1341                          * the last block on-disk.
1342                          */
1343                         if (truncating && error == 0 &&
1344                             vap->va_size < aligned_size) {
1345                                 struct buf *bp;
1346                                 int offset;
1347
1348                                 offset = vap->va_size & HAMMER_BUFMASK;
1349                                 error = bread(ap->a_vp,
1350                                               aligned_size - HAMMER_BUFSIZE,
1351                                               HAMMER_BUFSIZE, &bp);
1352                                 if (error == 0) {
1353                                         bzero(bp->b_data + offset,
1354                                               HAMMER_BUFSIZE - offset);
1355                                         bdwrite(bp);
1356                                 } else {
1357                                         brelse(bp);
1358                                 }
1359                         }
1360                         break;
1361                 case VDATABASE:
1362                         error = hammer_ip_delete_range(&trans, ip,
1363                                                     vap->va_size,
1364                                                     0x7FFFFFFFFFFFFFFFLL,
1365                                                     &spike);
1366                         ip->ino_rec.ino_size = vap->va_size;
1367                         modflags |= HAMMER_INODE_RDIRTY;
1368                         break;
1369                 default:
1370                         error = EINVAL;
1371                         goto done;
1372                 }
1373                 if (error == ENOSPC) {
1374                         error = hammer_spike(&spike);
1375                         if (error == 0)
1376                                 continue;
1377                 }
1378                 KKASSERT(spike == NULL);
1379                 break;
1380         }
1381         if (vap->va_atime.tv_sec != VNOVAL) {
1382                 ip->ino_rec.ino_atime =
1383                         hammer_timespec_to_transid(&vap->va_atime);
1384                 modflags |= HAMMER_INODE_ITIMES;
1385         }
1386         if (vap->va_mtime.tv_sec != VNOVAL) {
1387                 ip->ino_rec.ino_mtime =
1388                         hammer_timespec_to_transid(&vap->va_mtime);
1389                 modflags |= HAMMER_INODE_ITIMES;
1390         }
1391         if (vap->va_mode != (mode_t)VNOVAL) {
1392                 if (ip->ino_data.mode != vap->va_mode) {
1393                         ip->ino_data.mode = vap->va_mode;
1394                         modflags |= HAMMER_INODE_DDIRTY;
1395                 }
1396         }
1397 done:
1398         if (error) {
1399                 hammer_abort_transaction(&trans);
1400         } else {
1401                 hammer_modify_inode(&trans, ip, modflags);
1402                 hammer_commit_transaction(&trans);
1403         }
1404         return (error);
1405 }
1406
1407 /*
1408  * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target }
1409  */
1410 static
1411 int
1412 hammer_vop_nsymlink(struct vop_nsymlink_args *ap)
1413 {
1414         struct hammer_transaction trans;
1415         struct hammer_inode *dip;
1416         struct hammer_inode *nip;
1417         struct nchandle *nch;
1418         hammer_record_t record;
1419         int error;
1420         int bytes;
1421
1422         ap->a_vap->va_type = VLNK;
1423
1424         nch = ap->a_nch;
1425         dip = VTOI(ap->a_dvp);
1426
1427         if (dip->flags & HAMMER_INODE_RO)
1428                 return (EROFS);
1429
1430         /*
1431          * Create a transaction to cover the operations we perform.
1432          */
1433         hammer_start_transaction(&trans, dip->hmp);
1434
1435         /*
1436          * Create a new filesystem object of the requested type.  The
1437          * returned inode will be referenced but not locked.
1438          */
1439
1440         error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, dip, &nip);
1441         if (error) {
1442                 hammer_abort_transaction(&trans);
1443                 *ap->a_vpp = NULL;
1444                 return (error);
1445         }
1446
1447         /*
1448          * Add the new filesystem object to the directory.  This will also
1449          * bump the inode's link count.
1450          */
1451         error = hammer_ip_add_directory(&trans, dip, nch->ncp, nip);
1452
1453         /*
1454          * Add a record representing the symlink.  symlink stores the link
1455          * as pure data, not a string, and is no \0 terminated.
1456          */
1457         if (error == 0) {
1458                 record = hammer_alloc_mem_record(nip);
1459                 bytes = strlen(ap->a_target);
1460
1461                 record->rec.generic.base.base.key = HAMMER_FIXKEY_SYMLINK;
1462                 record->rec.generic.base.base.rec_type = HAMMER_RECTYPE_FIX;
1463                 record->rec.generic.base.data_len = bytes;
1464                 if (bytes <= sizeof(record->rec.generic.filler)) {
1465                         record->data = (void *)record->rec.generic.filler;
1466                         bcopy(ap->a_target, record->data, bytes);
1467                 } else {
1468                         record->data = (void *)ap->a_target;
1469                         /* will be reallocated by routine below */
1470                 }
1471                 error = hammer_ip_add_record(&trans, record);
1472         }
1473
1474         /*
1475          * Finish up.
1476          */
1477         if (error) {
1478                 hammer_rel_inode(nip, 0);
1479                 hammer_abort_transaction(&trans);
1480                 *ap->a_vpp = NULL;
1481         } else {
1482                 hammer_commit_transaction(&trans);
1483                 error = hammer_get_vnode(nip, LK_EXCLUSIVE, ap->a_vpp);
1484                 hammer_rel_inode(nip, 0);
1485                 if (error == 0) {
1486                         cache_setunresolved(ap->a_nch);
1487                         cache_setvp(ap->a_nch, *ap->a_vpp);
1488                 }
1489         }
1490         return (error);
1491 }
1492
1493 /*
1494  * hammer_vop_nwhiteout { nch, dvp, cred, flags }
1495  */
1496 static
1497 int
1498 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap)
1499 {
1500         return(hammer_dounlink(ap->a_nch, ap->a_dvp, ap->a_cred, ap->a_flags));
1501 }
1502
1503 /*
1504  * hammer_vop_ioctl { vp, command, data, fflag, cred }
1505  */
1506 static
1507 int
1508 hammer_vop_ioctl(struct vop_ioctl_args *ap)
1509 {
1510         struct hammer_inode *ip = ap->a_vp->v_data;
1511
1512         return(hammer_ioctl(ip, ap->a_command, ap->a_data,
1513                             ap->a_fflag, ap->a_cred));
1514 }
1515
1516 static
1517 int
1518 hammer_vop_mountctl(struct vop_mountctl_args *ap)
1519 {
1520         struct mount *mp;
1521         int error;
1522
1523         mp = ap->a_head.a_ops->head.vv_mount;
1524
1525         switch(ap->a_op) {
1526         case MOUNTCTL_SET_EXPORT:
1527                 if (ap->a_ctllen != sizeof(struct export_args))
1528                         error = EINVAL;
1529                 error = hammer_vfs_export(mp, ap->a_op,
1530                                       (const struct export_args *)ap->a_ctl);
1531                 break;
1532         default:
1533                 error = journal_mountctl(ap);
1534                 break;
1535         }
1536         return(error);
1537 }
1538
1539 /*
1540  * hammer_vop_strategy { vp, bio }
1541  *
1542  * Strategy call, used for regular file read & write only.  Note that the
1543  * bp may represent a cluster.
1544  *
1545  * To simplify operation and allow better optimizations in the future,
1546  * this code does not make any assumptions with regards to buffer alignment
1547  * or size.
1548  */
1549 static
1550 int
1551 hammer_vop_strategy(struct vop_strategy_args *ap)
1552 {
1553         struct buf *bp;
1554         int error;
1555
1556         bp = ap->a_bio->bio_buf;
1557
1558         switch(bp->b_cmd) {
1559         case BUF_CMD_READ:
1560                 error = hammer_vop_strategy_read(ap);
1561                 break;
1562         case BUF_CMD_WRITE:
1563                 error = hammer_vop_strategy_write(ap);
1564                 break;
1565         default:
1566                 error = EINVAL;
1567                 break;
1568         }
1569         bp->b_error = error;
1570         if (error)
1571                 bp->b_flags |= B_ERROR;
1572         biodone(ap->a_bio);
1573         return (error);
1574 }
1575
1576 /*
1577  * Read from a regular file.  Iterate the related records and fill in the
1578  * BIO/BUF.  Gaps are zero-filled.
1579  *
1580  * The support code in hammer_object.c should be used to deal with mixed
1581  * in-memory and on-disk records.
1582  *
1583  * XXX atime update
1584  */
1585 static
1586 int
1587 hammer_vop_strategy_read(struct vop_strategy_args *ap)
1588 {
1589         struct hammer_inode *ip = ap->a_vp->v_data;
1590         struct hammer_cursor cursor;
1591         hammer_record_ondisk_t rec;
1592         hammer_base_elm_t base;
1593         struct bio *bio;
1594         struct buf *bp;
1595         int64_t rec_offset;
1596         int64_t ran_end;
1597         int64_t tmp64;
1598         int error;
1599         int boff;
1600         int roff;
1601         int n;
1602
1603         bio = ap->a_bio;
1604         bp = bio->bio_buf;
1605
1606         hammer_init_cursor_hmp(&cursor, &ip->cache[0], ip->hmp);
1607
1608         /*
1609          * Key range (begin and end inclusive) to scan.  Note that the key's
1610          * stored in the actual records represent BASE+LEN, not BASE.  The
1611          * first record containing bio_offset will have a key > bio_offset.
1612          */
1613         cursor.key_beg.obj_id = ip->obj_id;
1614         cursor.key_beg.create_tid = 0;
1615         cursor.key_beg.delete_tid = 0;
1616         cursor.key_beg.obj_type = 0;
1617         cursor.key_beg.key = bio->bio_offset + 1;
1618         cursor.asof = ip->obj_asof;
1619         cursor.flags |= HAMMER_CURSOR_ASOF;
1620
1621         cursor.key_end = cursor.key_beg;
1622         if (ip->ino_rec.base.base.obj_type == HAMMER_OBJTYPE_DBFILE) {
1623                 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB;
1624                 cursor.key_end.rec_type = HAMMER_RECTYPE_DB;
1625                 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
1626         } else {
1627                 ran_end = bio->bio_offset + bp->b_bufsize;
1628                 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
1629                 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
1630                 tmp64 = ran_end + MAXPHYS + 1;  /* work-around GCC-4 bug */
1631                 if (tmp64 < ran_end)
1632                         cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
1633                 else
1634                         cursor.key_end.key = ran_end + MAXPHYS + 1;
1635         }
1636         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
1637
1638         error = hammer_ip_first(&cursor, ip);
1639         boff = 0;
1640
1641         while (error == 0) {
1642                 error = hammer_ip_resolve_data(&cursor);
1643                 if (error)
1644                         break;
1645                 rec = cursor.record;
1646                 base = &rec->base.base;
1647
1648                 rec_offset = base->key - rec->data.base.data_len;
1649
1650                 /*
1651                  * Calculate the gap, if any, and zero-fill it.
1652                  */
1653                 n = (int)(rec_offset - (bio->bio_offset + boff));
1654                 if (n > 0) {
1655                         if (n > bp->b_bufsize - boff)
1656                                 n = bp->b_bufsize - boff;
1657                         bzero((char *)bp->b_data + boff, n);
1658                         boff += n;
1659                         n = 0;
1660                 }
1661
1662                 /*
1663                  * Calculate the data offset in the record and the number
1664                  * of bytes we can copy.
1665                  *
1666                  * Note there is a degenerate case here where boff may
1667                  * already be at bp->b_bufsize.
1668                  */
1669                 roff = -n;
1670                 n = rec->data.base.data_len - roff;
1671                 KKASSERT(n > 0);
1672                 if (n > bp->b_bufsize - boff)
1673                         n = bp->b_bufsize - boff;
1674                 bcopy((char *)cursor.data + roff, (char *)bp->b_data + boff, n);
1675                 boff += n;
1676                 if (boff == bp->b_bufsize)
1677                         break;
1678                 error = hammer_ip_next(&cursor);
1679         }
1680         hammer_done_cursor(&cursor);
1681
1682         /*
1683          * There may have been a gap after the last record
1684          */
1685         if (error == ENOENT)
1686                 error = 0;
1687         if (error == 0 && boff != bp->b_bufsize) {
1688                 KKASSERT(boff < bp->b_bufsize);
1689                 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff);
1690                 /* boff = bp->b_bufsize; */
1691         }
1692         bp->b_resid = 0;
1693         return(error);
1694 }
1695
1696 /*
1697  * Write to a regular file.  Iterate the related records and mark for
1698  * deletion.  If existing edge records (left and right side) overlap our
1699  * write they have to be marked deleted and new records created, usually
1700  * referencing a portion of the original data.  Then add a record to
1701  * represent the buffer.
1702  *
1703  * The support code in hammer_object.c should be used to deal with mixed
1704  * in-memory and on-disk records.
1705  */
1706 static
1707 int
1708 hammer_vop_strategy_write(struct vop_strategy_args *ap)
1709 {
1710         struct hammer_transaction trans;
1711         struct hammer_cursor *spike = NULL;
1712         hammer_inode_t ip;
1713         struct bio *bio;
1714         struct buf *bp;
1715         int error;
1716
1717         bio = ap->a_bio;
1718         bp = bio->bio_buf;
1719         ip = ap->a_vp->v_data;
1720
1721         if (ip->flags & HAMMER_INODE_RO)
1722                 return (EROFS);
1723
1724         /*
1725          * Start a transaction using the TID stored with the bp.
1726          */
1727         KKASSERT(bp->b_tid != 0);
1728         hammer_start_transaction_tid(&trans, ip->hmp, bp->b_tid);
1729
1730 retry:
1731         /*
1732          * Delete any records overlapping our range.  This function will
1733          * (eventually) properly truncate partial overlaps.
1734          */
1735         if (ip->ino_rec.base.base.obj_type == HAMMER_OBJTYPE_DBFILE) {
1736                 error = hammer_ip_delete_range(&trans, ip, bio->bio_offset,
1737                                                bio->bio_offset, &spike);
1738         } else {
1739                 error = hammer_ip_delete_range(&trans, ip, bio->bio_offset,
1740                                                bio->bio_offset +
1741                                                 bp->b_bufsize - 1,
1742                                                &spike);
1743         }
1744
1745         /*
1746          * Add a single record to cover the write
1747          */
1748         if (error == 0) {
1749                 error = hammer_ip_sync_data(&trans, ip, bio->bio_offset,
1750                                             bp->b_data, bp->b_bufsize,
1751                                             &spike);
1752         }
1753
1754         /*
1755          * If we ran out of space the spike structure will be filled in
1756          * and we must call hammer_spike with it, then retry.
1757          */
1758         if (error == ENOSPC) {
1759                 error = hammer_spike(&spike);
1760                 if (error == 0)
1761                         goto retry;
1762         }
1763         KKASSERT(spike == NULL);
1764
1765         /*
1766          * If an error occured abort the transaction
1767          */
1768         if (error) {
1769                 /* XXX undo deletion */
1770                 hammer_abort_transaction(&trans);
1771                 bp->b_resid = bp->b_bufsize;
1772         } else {
1773                 hammer_commit_transaction(&trans);
1774                 bp->b_resid = 0;
1775                 bp->b_tid = 0;
1776         }
1777         return(error);
1778 }
1779
1780 /*
1781  * dounlink - disconnect a directory entry
1782  *
1783  * XXX whiteout support not really in yet
1784  */
1785 static int
1786 hammer_dounlink(struct nchandle *nch, struct vnode *dvp, struct ucred *cred,
1787                 int flags)
1788 {
1789         struct hammer_transaction trans;
1790         struct namecache *ncp;
1791         hammer_inode_t dip;
1792         hammer_inode_t ip;
1793         hammer_record_ondisk_t rec;
1794         struct hammer_cursor cursor;
1795         int64_t namekey;
1796         int error;
1797
1798         /*
1799          * Calculate the namekey and setup the key range for the scan.  This
1800          * works kinda like a chained hash table where the lower 32 bits
1801          * of the namekey synthesize the chain.
1802          *
1803          * The key range is inclusive of both key_beg and key_end.
1804          */
1805         dip = VTOI(dvp);
1806         ncp = nch->ncp;
1807
1808         if (dip->flags & HAMMER_INODE_RO)
1809                 return (EROFS);
1810
1811         hammer_start_transaction(&trans, dip->hmp);
1812
1813         namekey = hammer_directory_namekey(ncp->nc_name, ncp->nc_nlen);
1814 retry:
1815         hammer_init_cursor_hmp(&cursor, &dip->cache[0], dip->hmp);
1816         cursor.key_beg.obj_id = dip->obj_id;
1817         cursor.key_beg.key = namekey;
1818         cursor.key_beg.create_tid = 0;
1819         cursor.key_beg.delete_tid = 0;
1820         cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1821         cursor.key_beg.obj_type = 0;
1822
1823         cursor.key_end = cursor.key_beg;
1824         cursor.key_end.key |= 0xFFFFFFFFULL;
1825         cursor.asof = dip->obj_asof;
1826         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1827
1828         /*
1829          * Scan all matching records (the chain), locate the one matching
1830          * the requested path component.  info->last_error contains the
1831          * error code on search termination and could be 0, ENOENT, or
1832          * something else.
1833          *
1834          * The hammer_ip_*() functions merge in-memory records with on-disk
1835          * records for the purposes of the search.
1836          */
1837         error = hammer_ip_first(&cursor, dip);
1838         while (error == 0) {
1839                 error = hammer_ip_resolve_data(&cursor);
1840                 if (error)
1841                         break;
1842                 rec = cursor.record;
1843                 if (ncp->nc_nlen == rec->entry.base.data_len &&
1844                     bcmp(ncp->nc_name, cursor.data, ncp->nc_nlen) == 0) {
1845                         break;
1846                 }
1847                 error = hammer_ip_next(&cursor);
1848         }
1849
1850         /*
1851          * If all is ok we have to get the inode so we can adjust nlinks.
1852          *
1853          * If the target is a directory, it must be empty.
1854          */
1855         if (error == 0) {
1856                 ip = hammer_get_inode(dip->hmp, &dip->cache[1],
1857                                       rec->entry.obj_id,
1858                                       dip->hmp->asof, 0, &error);
1859                 if (error == ENOENT) {
1860                         kprintf("obj_id %016llx\n", rec->entry.obj_id);
1861                         Debugger("ENOENT unlinking object that should exist, cont to sync");
1862                         hammer_sync_hmp(dip->hmp, MNT_NOWAIT);
1863                         Debugger("ENOENT - sync done");
1864                 }
1865                 if (error == 0 && ip->ino_rec.base.base.obj_type ==
1866                                   HAMMER_OBJTYPE_DIRECTORY) {
1867                         error = hammer_ip_check_directory_empty(&trans, ip);
1868                 }
1869                 /*
1870                  * WARNING: hammer_ip_del_directory() may have to terminate
1871                  * the cursor to avoid a lock recursion.  It's ok to call
1872                  * hammer_done_cursor() twice.
1873                  */
1874                 if (error == 0)
1875                         error = hammer_ip_del_directory(&trans, &cursor, dip, ip);
1876                 if (error == 0) {
1877                         cache_setunresolved(nch);
1878                         cache_setvp(nch, NULL);
1879                         /* XXX locking */
1880                         if (ip->vp)
1881                                 cache_inval_vp(ip->vp, CINV_DESTROY);
1882                 }
1883                 hammer_rel_inode(ip, 0);
1884         }
1885         hammer_done_cursor(&cursor);
1886         if (error == EDEADLK)
1887                 goto retry;
1888
1889         if (error == 0)
1890                 hammer_commit_transaction(&trans);
1891         else
1892                 hammer_abort_transaction(&trans);
1893         return (error);
1894 }
1895
1896 /************************************************************************
1897  *                          FIFO AND SPECFS OPS                         *
1898  ************************************************************************
1899  *
1900  */
1901
1902 static int
1903 hammer_vop_fifoclose (struct vop_close_args *ap)
1904 {
1905         /* XXX update itimes */
1906         return (VOCALL(&fifo_vnode_vops, &ap->a_head));
1907 }
1908
1909 static int
1910 hammer_vop_fiforead (struct vop_read_args *ap)
1911 {
1912         int error;
1913
1914         error = VOCALL(&fifo_vnode_vops, &ap->a_head);
1915         /* XXX update access time */
1916         return (error);
1917 }
1918
1919 static int
1920 hammer_vop_fifowrite (struct vop_write_args *ap)
1921 {
1922         int error;
1923
1924         error = VOCALL(&fifo_vnode_vops, &ap->a_head);
1925         /* XXX update access time */
1926         return (error);
1927 }
1928
1929 static int
1930 hammer_vop_specclose (struct vop_close_args *ap)
1931 {
1932         /* XXX update itimes */
1933         return (VOCALL(&spec_vnode_vops, &ap->a_head));
1934 }
1935
1936 static int
1937 hammer_vop_specread (struct vop_read_args *ap)
1938 {
1939         /* XXX update access time */
1940         return (VOCALL(&spec_vnode_vops, &ap->a_head));
1941 }
1942
1943 static int
1944 hammer_vop_specwrite (struct vop_write_args *ap)
1945 {
1946         /* XXX update last change time */
1947         return (VOCALL(&spec_vnode_vops, &ap->a_head));
1948 }
1949