sys/vfs/hammer2/hammer2_vnops.c

   1 /*
   2  * Copyright (c) 2011-2015 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@dragonflybsd.org>
   6  * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org>
   7  * by Daniel Flores (GSOC 2013 - mentored by Matthew Dillon, compression)
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  * 3. Neither the name of The DragonFly Project nor the names of its
  20  *    contributors may be used to endorse or promote products derived
  21  *    from this software without specific, prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  26  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  27  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  28  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  29  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  30  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  31  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  32  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  33  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36 /*
  37  * Kernel Filesystem interface
  38  *
  39  * NOTE! local ipdata pointers must be reloaded on any modifying operation
  40  *       to the inode as its underlying chain may have changed.
  41  */
  42
  43 #include <sys/param.h>
  44 #include <sys/systm.h>
  45 #include <sys/kernel.h>
  46 #include <sys/fcntl.h>
  47 #include <sys/buf.h>
  48 #include <sys/proc.h>
  49 #include <sys/namei.h>
  50 #include <sys/mount.h>
  51 #include <sys/vnode.h>
  52 #include <sys/mountctl.h>
  53 #include <sys/dirent.h>
  54 #include <sys/uio.h>
  55 #include <sys/objcache.h>
  56 #include <sys/event.h>
  57 #include <sys/file.h>
  58 #include <vfs/fifofs/fifo.h>
  59
  60 #include "hammer2.h"
  61
  62 static int hammer2_read_file(hammer2_inode_t *ip, struct uio *uio,
  63                                 int seqcount);
  64 static int hammer2_write_file(hammer2_inode_t *ip, struct uio *uio,
  65                                 int ioflag, int seqcount);
  66 static void hammer2_extend_file(hammer2_inode_t *ip, hammer2_key_t nsize);
  67 static void hammer2_truncate_file(hammer2_inode_t *ip, hammer2_key_t nsize);
  68
  69 struct objcache *cache_xops;
  70
  71 static __inline
  72 void
  73 hammer2_knote(struct vnode *vp, int flags)
  74 {
  75         if (flags)
  76                 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags);
  77 }
  78
  79 /*
  80  * Last reference to a vnode is going away but it is still cached.
  81  */
  82 static
  83 int
  84 hammer2_vop_inactive(struct vop_inactive_args *ap)
  85 {
  86         hammer2_inode_t *ip;
  87         struct vnode *vp;
  88
  89         LOCKSTART;
  90         vp = ap->a_vp;
  91         ip = VTOI(vp);
  92
  93         /*
  94          * Degenerate case
  95          */
  96         if (ip == NULL) {
  97                 vrecycle(vp);
  98                 LOCKSTOP;
  99                 return (0);
 100         }
 101
 102         /*
 103          * Check for deleted inodes and recycle immediately on the last
 104          * release.  Be sure to destroy any left-over buffer cache buffers
 105          * so we do not waste time trying to flush them.
 106          *
 107          * WARNING: nvtruncbuf() can only be safely called without the inode
 108          *          lock held due to the way our write thread works.
 109          */
 110         if (ip->flags & HAMMER2_INODE_ISUNLINKED) {
 111                 hammer2_key_t lbase;
 112                 int nblksize;
 113
 114                 /*
 115                  * Detect updates to the embedded data which may be
 116                  * synchronized by the strategy code.  Simply mark the
 117                  * inode modified so it gets picked up by our normal flush.
 118                  */
 119                 nblksize = hammer2_calc_logical(ip, 0, &lbase, NULL);
 120                 nvtruncbuf(vp, 0, nblksize, 0, 0);
 121                 vrecycle(vp);
 122         }
 123         LOCKSTOP;
 124         return (0);
 125 }
 126
 127 /*
 128  * Reclaim a vnode so that it can be reused; after the inode is
 129  * disassociated, the filesystem must manage it alone.
 130  */
 131 static
 132 int
 133 hammer2_vop_reclaim(struct vop_reclaim_args *ap)
 134 {
 135         hammer2_inode_t *ip;
 136         hammer2_pfs_t *pmp;
 137         struct vnode *vp;
 138
 139         LOCKSTART;
 140         vp = ap->a_vp;
 141         ip = VTOI(vp);
 142         if (ip == NULL) {
 143                 LOCKSTOP;
 144                 return(0);
 145         }
 146         pmp = ip->pmp;
 147
 148         /*
 149          * The final close of a deleted file or directory marks it for
 150          * destruction.  The DELETED flag allows the flusher to shortcut
 151          * any modified blocks still unflushed (that is, just ignore them).
 152          *
 153          * HAMMER2 usually does not try to optimize the freemap by returning
 154          * deleted blocks to it as it does not usually know how many snapshots
 155          * might be referencing portions of the file/dir.
 156          */
 157         vp->v_data = NULL;
 158         ip->vp = NULL;
 159
 160         /*
 161          * NOTE! We do not attempt to flush chains here, flushing is
 162          *       really fragile and could also deadlock.
 163          */
 164         vclrisdirty(vp);
 165
 166         /*
 167          * Once reclaimed the inode is disconnected from the normal flush
 168          * mechanism and must be tracked
 169          *
 170          * A reclaim can occur at any time so we cannot safely start a
 171          * transaction to handle reclamation of unlinked files.  Instead,
 172          * the ip is left with a reference and placed on a linked list and
 173          * handled later on.
 174          */
 175         if (ip->flags & HAMMER2_INODE_ISUNLINKED) {
 176                 hammer2_inode_unlink_t *ipul;
 177
 178                 ipul = kmalloc(sizeof(*ipul), pmp->minode, M_WAITOK | M_ZERO);
 179                 ipul->ip = ip;
 180
 181                 hammer2_spin_ex(&pmp->list_spin);
 182                 TAILQ_INSERT_TAIL(&pmp->unlinkq, ipul, entry);
 183                 hammer2_spin_unex(&pmp->list_spin);
 184                 /* retain ref from vp for ipul */
 185         } else {
 186                 hammer2_inode_drop(ip);                 /* vp ref */
 187         }
 188
 189         /*
 190          * XXX handle background sync when ip dirty, kernel will no longer
 191          * notify us regarding this inode because there is no longer a
 192          * vnode attached to it.
 193          */
 194
 195         LOCKSTOP;
 196         return (0);
 197 }
 198
 199 static
 200 int
 201 hammer2_vop_fsync(struct vop_fsync_args *ap)
 202 {
 203         hammer2_inode_t *ip;
 204         struct vnode *vp;
 205
 206         LOCKSTART;
 207         vp = ap->a_vp;
 208         ip = VTOI(vp);
 209
 210 #if 0
 211         /* XXX can't do this yet */
 212         hammer2_trans_init(ip->pmp, HAMMER2_TRANS_ISFLUSH);
 213         vfsync(vp, ap->a_waitfor, 1, NULL, NULL);
 214 #endif
 215         hammer2_trans_init(ip->pmp, 0);
 216         vfsync(vp, ap->a_waitfor, 1, NULL, NULL);
 217
 218         /*
 219          * Calling chain_flush here creates a lot of duplicative
 220          * COW operations due to non-optimal vnode ordering.
 221          *
 222          * Only do it for an actual fsync() syscall.  The other forms
 223          * which call this function will eventually call chain_flush
 224          * on the volume root as a catch-all, which is far more optimal.
 225          */
 226         hammer2_inode_lock(ip, 0);
 227         if (ip->flags & HAMMER2_INODE_MODIFIED)
 228                 hammer2_inode_fsync(ip);
 229         hammer2_inode_unlock(ip);
 230         hammer2_trans_done(ip->pmp);
 231
 232         LOCKSTOP;
 233         return (0);
 234 }
 235
 236 static
 237 int
 238 hammer2_vop_access(struct vop_access_args *ap)
 239 {
 240         hammer2_inode_t *ip = VTOI(ap->a_vp);
 241         uid_t uid;
 242         gid_t gid;
 243         int error;
 244
 245         LOCKSTART;
 246         hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
 247         uid = hammer2_to_unix_xid(&ip->meta.uid);
 248         gid = hammer2_to_unix_xid(&ip->meta.gid);
 249         error = vop_helper_access(ap, uid, gid, ip->meta.mode, ip->meta.uflags);
 250         hammer2_inode_unlock(ip);
 251
 252         LOCKSTOP;
 253         return (error);
 254 }
 255
 256 static
 257 int
 258 hammer2_vop_getattr(struct vop_getattr_args *ap)
 259 {
 260         hammer2_pfs_t *pmp;
 261         hammer2_inode_t *ip;
 262         struct vnode *vp;
 263         struct vattr *vap;
 264         hammer2_chain_t *chain;
 265         int i;
 266
 267         LOCKSTART;
 268         vp = ap->a_vp;
 269         vap = ap->a_vap;
 270
 271         ip = VTOI(vp);
 272         pmp = ip->pmp;
 273
 274         hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
 275
 276         vap->va_fsid = pmp->mp->mnt_stat.f_fsid.val[0];
 277         vap->va_fileid = ip->meta.inum;
 278         vap->va_mode = ip->meta.mode;
 279         vap->va_nlink = ip->meta.nlinks;
 280         vap->va_uid = hammer2_to_unix_xid(&ip->meta.uid);
 281         vap->va_gid = hammer2_to_unix_xid(&ip->meta.gid);
 282         vap->va_rmajor = 0;
 283         vap->va_rminor = 0;
 284         vap->va_size = ip->meta.size;   /* protected by shared lock */
 285         vap->va_blocksize = HAMMER2_PBUFSIZE;
 286         vap->va_flags = ip->meta.uflags;
 287         hammer2_time_to_timespec(ip->meta.ctime, &vap->va_ctime);
 288         hammer2_time_to_timespec(ip->meta.mtime, &vap->va_mtime);
 289         hammer2_time_to_timespec(ip->meta.mtime, &vap->va_atime);
 290         vap->va_gen = 1;
 291         vap->va_bytes = 0;
 292         for (i = 0; i < ip->cluster.nchains; ++i) {
 293                 if ((chain = ip->cluster.array[i].chain) != NULL) {
 294                         if (vap->va_bytes < chain->bref.data_count)
 295                                 vap->va_bytes = chain->bref.data_count;
 296                 }
 297         }
 298         vap->va_type = hammer2_get_vtype(ip->meta.type);
 299         vap->va_filerev = 0;
 300         vap->va_uid_uuid = ip->meta.uid;
 301         vap->va_gid_uuid = ip->meta.gid;
 302         vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID |
 303                           VA_FSID_UUID_VALID;
 304
 305         hammer2_inode_unlock(ip);
 306
 307         LOCKSTOP;
 308         return (0);
 309 }
 310
 311 static
 312 int
 313 hammer2_vop_setattr(struct vop_setattr_args *ap)
 314 {
 315         hammer2_inode_t *ip;
 316         struct vnode *vp;
 317         struct vattr *vap;
 318         int error;
 319         int kflags = 0;
 320         uint64_t ctime;
 321
 322         LOCKSTART;
 323         vp = ap->a_vp;
 324         vap = ap->a_vap;
 325         hammer2_update_time(&ctime);
 326
 327         ip = VTOI(vp);
 328
 329         if (ip->pmp->ronly) {
 330                 LOCKSTOP;
 331                 return(EROFS);
 332         }
 333
 334         hammer2_pfs_memory_wait(ip->pmp);
 335         hammer2_trans_init(ip->pmp, 0);
 336         hammer2_inode_lock(ip, 0);
 337         error = 0;
 338
 339         if (vap->va_flags != VNOVAL) {
 340                 u_int32_t flags;
 341
 342                 flags = ip->meta.uflags;
 343                 error = vop_helper_setattr_flags(&flags, vap->va_flags,
 344                                      hammer2_to_unix_xid(&ip->meta.uid),
 345                                      ap->a_cred);
 346                 if (error == 0) {
 347                         if (ip->meta.uflags != flags) {
 348                                 hammer2_inode_modify(ip);
 349                                 ip->meta.uflags = flags;
 350                                 ip->meta.ctime = ctime;
 351                                 kflags |= NOTE_ATTRIB;
 352                         }
 353                         if (ip->meta.uflags & (IMMUTABLE | APPEND)) {
 354                                 error = 0;
 355                                 goto done;
 356                         }
 357                 }
 358                 goto done;
 359         }
 360         if (ip->meta.uflags & (IMMUTABLE | APPEND)) {
 361                 error = EPERM;
 362                 goto done;
 363         }
 364         if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
 365                 mode_t cur_mode = ip->meta.mode;
 366                 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid);
 367                 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid);
 368                 uuid_t uuid_uid;
 369                 uuid_t uuid_gid;
 370
 371                 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid,
 372                                          ap->a_cred,
 373                                          &cur_uid, &cur_gid, &cur_mode);
 374                 if (error == 0) {
 375                         hammer2_guid_to_uuid(&uuid_uid, cur_uid);
 376                         hammer2_guid_to_uuid(&uuid_gid, cur_gid);
 377                         if (bcmp(&uuid_uid, &ip->meta.uid, sizeof(uuid_uid)) ||
 378                             bcmp(&uuid_gid, &ip->meta.gid, sizeof(uuid_gid)) ||
 379                             ip->meta.mode != cur_mode
 380                         ) {
 381                                 hammer2_inode_modify(ip);
 382                                 ip->meta.uid = uuid_uid;
 383                                 ip->meta.gid = uuid_gid;
 384                                 ip->meta.mode = cur_mode;
 385                                 ip->meta.ctime = ctime;
 386                         }
 387                         kflags |= NOTE_ATTRIB;
 388                 }
 389         }
 390
 391         /*
 392          * Resize the file
 393          */
 394         if (vap->va_size != VNOVAL && ip->meta.size != vap->va_size) {
 395                 switch(vp->v_type) {
 396                 case VREG:
 397                         if (vap->va_size == ip->meta.size)
 398                                 break;
 399                         if (vap->va_size < ip->meta.size) {
 400                                 hammer2_truncate_file(ip, vap->va_size);
 401                         } else {
 402                                 hammer2_extend_file(ip, vap->va_size);
 403                         }
 404                         hammer2_inode_modify(ip);
 405                         ip->meta.mtime = ctime;
 406                         break;
 407                 default:
 408                         error = EINVAL;
 409                         goto done;
 410                 }
 411         }
 412 #if 0
 413         /* atime not supported */
 414         if (vap->va_atime.tv_sec != VNOVAL) {
 415                 hammer2_inode_modify(ip);
 416                 ip->meta.atime = hammer2_timespec_to_time(&vap->va_atime);
 417                 kflags |= NOTE_ATTRIB;
 418         }
 419 #endif
 420         if (vap->va_mode != (mode_t)VNOVAL) {
 421                 mode_t cur_mode = ip->meta.mode;
 422                 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid);
 423                 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid);
 424
 425                 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred,
 426                                          cur_uid, cur_gid, &cur_mode);
 427                 if (error == 0 && ip->meta.mode != cur_mode) {
 428                         hammer2_inode_modify(ip);
 429                         ip->meta.mode = cur_mode;
 430                         ip->meta.ctime = ctime;
 431                         kflags |= NOTE_ATTRIB;
 432                 }
 433         }
 434
 435         if (vap->va_mtime.tv_sec != VNOVAL) {
 436                 hammer2_inode_modify(ip);
 437                 ip->meta.mtime = hammer2_timespec_to_time(&vap->va_mtime);
 438                 kflags |= NOTE_ATTRIB;
 439         }
 440
 441 done:
 442         /*
 443          * If a truncation occurred we must call inode_fsync() now in order
 444          * to trim the related data chains, otherwise a later expansion can
 445          * cause havoc.
 446          *
 447          * If an extend occured that changed the DIRECTDATA state, we must
 448          * call inode_fsync now in order to prepare the inode's indirect
 449          * block table.
 450          */
 451         if (ip->flags & HAMMER2_INODE_RESIZED)
 452                 hammer2_inode_fsync(ip);
 453
 454         /*
 455          * Cleanup.
 456          */
 457         hammer2_inode_unlock(ip);
 458         hammer2_trans_done(ip->pmp);
 459         hammer2_knote(ip->vp, kflags);
 460
 461         LOCKSTOP;
 462         return (error);
 463 }
 464
 465 static
 466 int
 467 hammer2_vop_readdir(struct vop_readdir_args *ap)
 468 {
 469         hammer2_xop_readdir_t *xop;
 470         hammer2_blockref_t bref;
 471         hammer2_inode_t *ip;
 472         hammer2_tid_t inum;
 473         hammer2_key_t lkey;
 474         struct uio *uio;
 475         off_t *cookies;
 476         off_t saveoff;
 477         int cookie_index;
 478         int ncookies;
 479         int error;
 480         int eofflag;
 481         int dtype;
 482         int r;
 483
 484         LOCKSTART;
 485         ip = VTOI(ap->a_vp);
 486         uio = ap->a_uio;
 487         saveoff = uio->uio_offset;
 488         eofflag = 0;
 489         error = 0;
 490
 491         /*
 492          * Setup cookies directory entry cookies if requested
 493          */
 494         if (ap->a_ncookies) {
 495                 ncookies = uio->uio_resid / 16 + 1;
 496                 if (ncookies > 1024)
 497                         ncookies = 1024;
 498                 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
 499         } else {
 500                 ncookies = -1;
 501                 cookies = NULL;
 502         }
 503         cookie_index = 0;
 504
 505         hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
 506
 507         /*
 508          * Handle artificial entries.  To ensure that only positive 64 bit
 509          * quantities are returned to userland we always strip off bit 63.
 510          * The hash code is designed such that codes 0x0000-0x7FFF are not
 511          * used, allowing us to use these codes for articial entries.
 512          *
 513          * Entry 0 is used for '.' and entry 1 is used for '..'.  Do not
 514          * allow '..' to cross the mount point into (e.g.) the super-root.
 515          */
 516         if (saveoff == 0) {
 517                 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK;
 518                 r = vop_write_dirent(&error, uio, inum, DT_DIR, 1, ".");
 519                 if (r)
 520                         goto done;
 521                 if (cookies)
 522                         cookies[cookie_index] = saveoff;
 523                 ++saveoff;
 524                 ++cookie_index;
 525                 if (cookie_index == ncookies)
 526                         goto done;
 527         }
 528
 529         if (saveoff == 1) {
 530                 /*
 531                  * Be careful with lockorder when accessing ".."
 532                  *
 533                  * (ip is the current dir. xip is the parent dir).
 534                  */
 535                 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK;
 536                 if (ip->pip && ip != ip->pmp->iroot)
 537                         inum = ip->pip->meta.inum & HAMMER2_DIRHASH_USERMSK;
 538                 r = vop_write_dirent(&error, uio, inum, DT_DIR, 2, "..");
 539                 if (r)
 540                         goto done;
 541                 if (cookies)
 542                         cookies[cookie_index] = saveoff;
 543                 ++saveoff;
 544                 ++cookie_index;
 545                 if (cookie_index == ncookies)
 546                         goto done;
 547         }
 548
 549         lkey = saveoff | HAMMER2_DIRHASH_VISIBLE;
 550         if (hammer2_debug & 0x0020)
 551                 kprintf("readdir: lkey %016jx\n", lkey);
 552         if (error)
 553                 goto done;
 554
 555         /*
 556          * Use XOP for cluster scan.
 557          *
 558          * parent is the inode cluster, already locked for us.  Don't
 559          * double lock shared locks as this will screw up upgrades.
 560          */
 561         xop = hammer2_xop_alloc(ip, 0);
 562         xop->lkey = lkey;
 563         hammer2_xop_start(&xop->head, hammer2_xop_readdir);
 564
 565         for (;;) {
 566                 const hammer2_inode_data_t *ripdata;
 567
 568                 error = hammer2_xop_collect(&xop->head, 0);
 569                 if (error)
 570                         break;
 571                 if (cookie_index == ncookies)
 572                         break;
 573                 if (hammer2_debug & 0x0020)
 574                 kprintf("cluster chain %p %p\n",
 575                         xop->head.cluster.focus,
 576                         (xop->head.cluster.focus ?
 577                          xop->head.cluster.focus->data : (void *)-1));
 578                 ripdata = &hammer2_cluster_rdata(&xop->head.cluster)->ipdata;
 579                 hammer2_cluster_bref(&xop->head.cluster, &bref);
 580                 if (bref.type == HAMMER2_BREF_TYPE_INODE) {
 581                         dtype = hammer2_get_dtype(ripdata);
 582                         saveoff = bref.key & HAMMER2_DIRHASH_USERMSK;
 583                         r = vop_write_dirent(&error, uio,
 584                                              ripdata->meta.inum &
 585                                               HAMMER2_DIRHASH_USERMSK,
 586                                              dtype,
 587                                              ripdata->meta.name_len,
 588                                              ripdata->filename);
 589                         if (r)
 590                                 break;
 591                         if (cookies)
 592                                 cookies[cookie_index] = saveoff;
 593                         ++cookie_index;
 594                 } else {
 595                         /* XXX chain error */
 596                         kprintf("bad chain type readdir %d\n", bref.type);
 597                 }
 598         }
 599         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
 600         if (error == ENOENT) {
 601                 error = 0;
 602                 eofflag = 1;
 603                 saveoff = (hammer2_key_t)-1;
 604         } else {
 605                 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK;
 606         }
 607 done:
 608         hammer2_inode_unlock(ip);
 609         if (ap->a_eofflag)
 610                 *ap->a_eofflag = eofflag;
 611         if (hammer2_debug & 0x0020)
 612                 kprintf("readdir: done at %016jx\n", saveoff);
 613         uio->uio_offset = saveoff & ~HAMMER2_DIRHASH_VISIBLE;
 614         if (error && cookie_index == 0) {
 615                 if (cookies) {
 616                         kfree(cookies, M_TEMP);
 617                         *ap->a_ncookies = 0;
 618                         *ap->a_cookies = NULL;
 619                 }
 620         } else {
 621                 if (cookies) {
 622                         *ap->a_ncookies = cookie_index;
 623                         *ap->a_cookies = cookies;
 624                 }
 625         }
 626         LOCKSTOP;
 627         return (error);
 628 }
 629
 630 /*
 631  * hammer2_vop_readlink { vp, uio, cred }
 632  */
 633 static
 634 int
 635 hammer2_vop_readlink(struct vop_readlink_args *ap)
 636 {
 637         struct vnode *vp;
 638         hammer2_inode_t *ip;
 639         int error;
 640
 641         vp = ap->a_vp;
 642         if (vp->v_type != VLNK)
 643                 return (EINVAL);
 644         ip = VTOI(vp);
 645
 646         error = hammer2_read_file(ip, ap->a_uio, 0);
 647         return (error);
 648 }
 649
 650 static
 651 int
 652 hammer2_vop_read(struct vop_read_args *ap)
 653 {
 654         struct vnode *vp;
 655         hammer2_inode_t *ip;
 656         struct uio *uio;
 657         int error;
 658         int seqcount;
 659         int bigread;
 660
 661         /*
 662          * Read operations supported on this vnode?
 663          */
 664         vp = ap->a_vp;
 665         if (vp->v_type != VREG)
 666                 return (EINVAL);
 667
 668         /*
 669          * Misc
 670          */
 671         ip = VTOI(vp);
 672         uio = ap->a_uio;
 673         error = 0;
 674
 675         seqcount = ap->a_ioflag >> 16;
 676         bigread = (uio->uio_resid > 100 * 1024 * 1024);
 677
 678         error = hammer2_read_file(ip, uio, seqcount);
 679         return (error);
 680 }
 681
 682 static
 683 int
 684 hammer2_vop_write(struct vop_write_args *ap)
 685 {
 686         hammer2_inode_t *ip;
 687         thread_t td;
 688         struct vnode *vp;
 689         struct uio *uio;
 690         int error;
 691         int seqcount;
 692
 693         /*
 694          * Read operations supported on this vnode?
 695          */
 696         vp = ap->a_vp;
 697         if (vp->v_type != VREG)
 698                 return (EINVAL);
 699
 700         /*
 701          * Misc
 702          */
 703         ip = VTOI(vp);
 704         uio = ap->a_uio;
 705         error = 0;
 706         if (ip->pmp->ronly) {
 707                 return (EROFS);
 708         }
 709
 710         seqcount = ap->a_ioflag >> 16;
 711
 712         /*
 713          * Check resource limit
 714          */
 715         if (uio->uio_resid > 0 && (td = uio->uio_td) != NULL && td->td_proc &&
 716             uio->uio_offset + uio->uio_resid >
 717              td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
 718                 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ);
 719                 return (EFBIG);
 720         }
 721
 722         /*
 723          * The transaction interlocks against flushes initiations
 724          * (note: but will run concurrently with the actual flush).
 725          */
 726         hammer2_trans_init(ip->pmp, 0);
 727         error = hammer2_write_file(ip, uio, ap->a_ioflag, seqcount);
 728         hammer2_trans_done(ip->pmp);
 729
 730         return (error);
 731 }
 732
 733 /*
 734  * Perform read operations on a file or symlink given an UNLOCKED
 735  * inode and uio.
 736  *
 737  * The passed ip is not locked.
 738  */
 739 static
 740 int
 741 hammer2_read_file(hammer2_inode_t *ip, struct uio *uio, int seqcount)
 742 {
 743         hammer2_off_t size;
 744         struct buf *bp;
 745         int error;
 746
 747         error = 0;
 748
 749         /*
 750          * UIO read loop.
 751          *
 752          * WARNING! Assumes that the kernel interlocks size changes at the
 753          *          vnode level.
 754          */
 755         hammer2_mtx_sh(&ip->lock);
 756         size = ip->meta.size;
 757         hammer2_mtx_unlock(&ip->lock);
 758
 759         while (uio->uio_resid > 0 && uio->uio_offset < size) {
 760                 hammer2_key_t lbase;
 761                 hammer2_key_t leof;
 762                 int lblksize;
 763                 int loff;
 764                 int n;
 765
 766                 lblksize = hammer2_calc_logical(ip, uio->uio_offset,
 767                                                 &lbase, &leof);
 768
 769                 error = cluster_read(ip->vp, leof, lbase, lblksize,
 770                                      uio->uio_resid, seqcount * BKVASIZE,
 771                                      &bp);
 772
 773                 if (error)
 774                         break;
 775                 loff = (int)(uio->uio_offset - lbase);
 776                 n = lblksize - loff;
 777                 if (n > uio->uio_resid)
 778                         n = uio->uio_resid;
 779                 if (n > size - uio->uio_offset)
 780                         n = (int)(size - uio->uio_offset);
 781                 bp->b_flags |= B_AGE;
 782                 uiomove((char *)bp->b_data + loff, n, uio);
 783                 bqrelse(bp);
 784         }
 785         return (error);
 786 }
 787
 788 /*
 789  * Write to the file represented by the inode via the logical buffer cache.
 790  * The inode may represent a regular file or a symlink.
 791  *
 792  * The inode must not be locked.
 793  */
 794 static
 795 int
 796 hammer2_write_file(hammer2_inode_t *ip, struct uio *uio,
 797                    int ioflag, int seqcount)
 798 {
 799         hammer2_key_t old_eof;
 800         hammer2_key_t new_eof;
 801         struct buf *bp;
 802         int kflags;
 803         int error;
 804         int modified;
 805
 806         /*
 807          * Setup if append
 808          *
 809          * WARNING! Assumes that the kernel interlocks size changes at the
 810          *          vnode level.
 811          */
 812         hammer2_mtx_ex(&ip->lock);
 813         if (ioflag & IO_APPEND)
 814                 uio->uio_offset = ip->meta.size;
 815         old_eof = ip->meta.size;
 816
 817         /*
 818          * Extend the file if necessary.  If the write fails at some point
 819          * we will truncate it back down to cover as much as we were able
 820          * to write.
 821          *
 822          * Doing this now makes it easier to calculate buffer sizes in
 823          * the loop.
 824          */
 825         kflags = 0;
 826         error = 0;
 827         modified = 0;
 828
 829         if (uio->uio_offset + uio->uio_resid > old_eof) {
 830                 new_eof = uio->uio_offset + uio->uio_resid;
 831                 modified = 1;
 832                 hammer2_extend_file(ip, new_eof);
 833                 kflags |= NOTE_EXTEND;
 834         } else {
 835                 new_eof = old_eof;
 836         }
 837         hammer2_mtx_unlock(&ip->lock);
 838
 839         /*
 840          * UIO write loop
 841          */
 842         while (uio->uio_resid > 0) {
 843                 hammer2_key_t lbase;
 844                 int trivial;
 845                 int endofblk;
 846                 int lblksize;
 847                 int loff;
 848                 int n;
 849
 850                 /*
 851                  * Don't allow the buffer build to blow out the buffer
 852                  * cache.
 853                  */
 854                 if ((ioflag & IO_RECURSE) == 0)
 855                         bwillwrite(HAMMER2_PBUFSIZE);
 856
 857                 /*
 858                  * This nominally tells us how much we can cluster and
 859                  * what the logical buffer size needs to be.  Currently
 860                  * we don't try to cluster the write and just handle one
 861                  * block at a time.
 862                  */
 863                 lblksize = hammer2_calc_logical(ip, uio->uio_offset,
 864                                                 &lbase, NULL);
 865                 loff = (int)(uio->uio_offset - lbase);
 866
 867                 KKASSERT(lblksize <= 65536);
 868
 869                 /*
 870                  * Calculate bytes to copy this transfer and whether the
 871                  * copy completely covers the buffer or not.
 872                  */
 873                 trivial = 0;
 874                 n = lblksize - loff;
 875                 if (n > uio->uio_resid) {
 876                         n = uio->uio_resid;
 877                         if (loff == lbase && uio->uio_offset + n == new_eof)
 878                                 trivial = 1;
 879                         endofblk = 0;
 880                 } else {
 881                         if (loff == 0)
 882                                 trivial = 1;
 883                         endofblk = 1;
 884                 }
 885
 886                 /*
 887                  * Get the buffer
 888                  */
 889                 if (uio->uio_segflg == UIO_NOCOPY) {
 890                         /*
 891                          * Issuing a write with the same data backing the
 892                          * buffer.  Instantiate the buffer to collect the
 893                          * backing vm pages, then read-in any missing bits.
 894                          *
 895                          * This case is used by vop_stdputpages().
 896                          */
 897                         bp = getblk(ip->vp, lbase, lblksize, GETBLK_BHEAVY, 0);
 898                         if ((bp->b_flags & B_CACHE) == 0) {
 899                                 bqrelse(bp);
 900                                 error = bread(ip->vp, lbase, lblksize, &bp);
 901                         }
 902                 } else if (trivial) {
 903                         /*
 904                          * Even though we are entirely overwriting the buffer
 905                          * we may still have to zero it out to avoid a
 906                          * mmap/write visibility issue.
 907                          */
 908                         bp = getblk(ip->vp, lbase, lblksize, GETBLK_BHEAVY, 0);
 909                         if ((bp->b_flags & B_CACHE) == 0)
 910                                 vfs_bio_clrbuf(bp);
 911                 } else {
 912                         /*
 913                          * Partial overwrite, read in any missing bits then
 914                          * replace the portion being written.
 915                          *
 916                          * (The strategy code will detect zero-fill physical
 917                          * blocks for this case).
 918                          */
 919                         error = bread(ip->vp, lbase, lblksize, &bp);
 920                         if (error == 0)
 921                                 bheavy(bp);
 922                 }
 923
 924                 if (error) {
 925                         brelse(bp);
 926                         break;
 927                 }
 928
 929                 /*
 930                  * Ok, copy the data in
 931                  */
 932                 error = uiomove(bp->b_data + loff, n, uio);
 933                 kflags |= NOTE_WRITE;
 934                 modified = 1;
 935                 if (error) {
 936                         brelse(bp);
 937                         break;
 938                 }
 939
 940                 /*
 941                  * WARNING: Pageout daemon will issue UIO_NOCOPY writes
 942                  *          with IO_SYNC or IO_ASYNC set.  These writes
 943                  *          must be handled as the pageout daemon expects.
 944                  */
 945                 if (ioflag & IO_SYNC) {
 946                         bwrite(bp);
 947                 } else if ((ioflag & IO_DIRECT) && endofblk) {
 948                         bawrite(bp);
 949                 } else if (ioflag & IO_ASYNC) {
 950                         bawrite(bp);
 951                 } else {
 952                         bdwrite(bp);
 953                 }
 954         }
 955
 956         /*
 957          * Cleanup.  If we extended the file EOF but failed to write through
 958          * the entire write is a failure and we have to back-up.
 959          */
 960         if (error && new_eof != old_eof) {
 961                 hammer2_mtx_ex(&ip->lock);
 962                 hammer2_truncate_file(ip, old_eof);
 963                 if (ip->flags & HAMMER2_INODE_MODIFIED)
 964                         hammer2_inode_fsync(ip);
 965                 hammer2_mtx_unlock(&ip->lock);
 966         } else if (modified) {
 967                 hammer2_mtx_ex(&ip->lock);
 968                 hammer2_inode_modify(ip);
 969                 hammer2_update_time(&ip->meta.mtime);
 970                 if (ip->flags & HAMMER2_INODE_MODIFIED)
 971                         hammer2_inode_fsync(ip);
 972                 hammer2_mtx_unlock(&ip->lock);
 973                 hammer2_knote(ip->vp, kflags);
 974         }
 975         hammer2_trans_assert_strategy(ip->pmp);
 976
 977         return error;
 978 }
 979
 980 /*
 981  * Truncate the size of a file.  The inode must not be locked.
 982  *
 983  * We must unconditionally set HAMMER2_INODE_RESIZED to properly
 984  * ensure that any on-media data beyond the new file EOF has been destroyed.
 985  *
 986  * WARNING: nvtruncbuf() can only be safely called without the inode lock
 987  *          held due to the way our write thread works.  If the truncation
 988  *          occurs in the middle of a buffer, nvtruncbuf() is responsible
 989  *          for dirtying that buffer and zeroing out trailing bytes.
 990  *
 991  * WARNING! Assumes that the kernel interlocks size changes at the
 992  *          vnode level.
 993  *
 994  * WARNING! Caller assumes responsibility for removing dead blocks
 995  *          if INODE_RESIZED is set.
 996  */
 997 static
 998 void
 999 hammer2_truncate_file(hammer2_inode_t *ip, hammer2_key_t nsize)
1000 {
1001         hammer2_key_t lbase;
1002         int nblksize;
1003
1004         LOCKSTART;
1005         hammer2_mtx_unlock(&ip->lock);
1006         if (ip->vp) {
1007                 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL);
1008                 nvtruncbuf(ip->vp, nsize,
1009                            nblksize, (int)nsize & (nblksize - 1),
1010                            0);
1011         }
1012         hammer2_mtx_ex(&ip->lock);
1013         KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0);
1014         ip->osize = ip->meta.size;
1015         ip->meta.size = nsize;
1016         atomic_set_int(&ip->flags, HAMMER2_INODE_MODIFIED |
1017                                    HAMMER2_INODE_RESIZED);
1018         LOCKSTOP;
1019 }
1020
1021 /*
1022  * Extend the size of a file.  The inode must not be locked.
1023  *
1024  * Even though the file size is changing, we do not have to set the
1025  * INODE_RESIZED bit unless the file size crosses the EMBEDDED_BYTES
1026  * boundary.  When this occurs a hammer2_inode_fsync() is required
1027  * to prepare the inode cluster's indirect block table.
1028  *
1029  * WARNING! Assumes that the kernel interlocks size changes at the
1030  *          vnode level.
1031  *
1032  * WARNING! Caller assumes responsibility for transitioning out
1033  *          of the inode DIRECTDATA mode if INODE_RESIZED is set.
1034  */
1035 static
1036 void
1037 hammer2_extend_file(hammer2_inode_t *ip, hammer2_key_t nsize)
1038 {
1039         hammer2_key_t lbase;
1040         hammer2_key_t osize;
1041         int oblksize;
1042         int nblksize;
1043
1044         LOCKSTART;
1045
1046         KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0);
1047         osize = ip->meta.size;
1048         ip->osize = osize;
1049         ip->meta.size = nsize;
1050         atomic_set_int(&ip->flags, HAMMER2_INODE_MODIFIED);
1051
1052         if (osize <= HAMMER2_EMBEDDED_BYTES && nsize > HAMMER2_EMBEDDED_BYTES)
1053                 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED);
1054
1055         hammer2_mtx_unlock(&ip->lock);
1056         if (ip->vp) {
1057                 oblksize = hammer2_calc_logical(ip, osize, &lbase, NULL);
1058                 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL);
1059                 nvextendbuf(ip->vp,
1060                             osize, nsize,
1061                             oblksize, nblksize,
1062                             -1, -1, 0);
1063         }
1064         hammer2_mtx_ex(&ip->lock);
1065
1066         LOCKSTOP;
1067 }
1068
1069 static
1070 int
1071 hammer2_vop_nresolve(struct vop_nresolve_args *ap)
1072 {
1073         hammer2_xop_nresolve_t *xop;
1074         hammer2_inode_t *ip;
1075         hammer2_inode_t *dip;
1076         struct namecache *ncp;
1077         struct vnode *vp;
1078         int error;
1079
1080         LOCKSTART;
1081         dip = VTOI(ap->a_dvp);
1082         xop = hammer2_xop_alloc(dip, 0);
1083
1084         ncp = ap->a_nch->ncp;
1085         hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen);
1086
1087         /*
1088          * Note: In DragonFly the kernel handles '.' and '..'.
1089          */
1090         hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1091         hammer2_xop_start(&xop->head, hammer2_xop_nresolve);
1092
1093         error = hammer2_xop_collect(&xop->head, 0);
1094         if (error) {
1095                 ip = NULL;
1096         } else {
1097                 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1);
1098         }
1099         hammer2_inode_unlock(dip);
1100
1101         /*
1102          * Acquire the related vnode
1103          *
1104          * NOTE: For error processing, only ENOENT resolves the namecache
1105          *       entry to NULL, otherwise we just return the error and
1106          *       leave the namecache unresolved.
1107          *
1108          * NOTE: multiple hammer2_inode structures can be aliased to the
1109          *       same chain element, for example for hardlinks.  This
1110          *       use case does not 'reattach' inode associations that
1111          *       might already exist, but always allocates a new one.
1112          *
1113          * WARNING: inode structure is locked exclusively via inode_get
1114          *          but chain was locked shared.  inode_unlock()
1115          *          will handle it properly.
1116          */
1117         if (ip) {
1118                 vp = hammer2_igetv(ip, &error);
1119                 if (error == 0) {
1120                         vn_unlock(vp);
1121                         cache_setvp(ap->a_nch, vp);
1122                 } else if (error == ENOENT) {
1123                         cache_setvp(ap->a_nch, NULL);
1124                 }
1125                 hammer2_inode_unlock(ip);
1126
1127                 /*
1128                  * The vp should not be released until after we've disposed
1129                  * of our locks, because it might cause vop_inactive() to
1130                  * be called.
1131                  */
1132                 if (vp)
1133                         vrele(vp);
1134         } else {
1135                 error = ENOENT;
1136                 cache_setvp(ap->a_nch, NULL);
1137         }
1138         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1139         KASSERT(error || ap->a_nch->ncp->nc_vp != NULL,
1140                 ("resolve error %d/%p ap %p\n",
1141                  error, ap->a_nch->ncp->nc_vp, ap));
1142         LOCKSTOP;
1143
1144         return error;
1145 }
1146
1147 static
1148 int
1149 hammer2_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
1150 {
1151         hammer2_inode_t *dip;
1152         hammer2_inode_t *ip;
1153         int error;
1154
1155         LOCKSTART;
1156         dip = VTOI(ap->a_dvp);
1157
1158         if ((ip = dip->pip) == NULL) {
1159                 *ap->a_vpp = NULL;
1160                 LOCKSTOP;
1161                 return ENOENT;
1162         }
1163         hammer2_inode_lock(ip, 0);
1164         *ap->a_vpp = hammer2_igetv(ip, &error);
1165         hammer2_inode_unlock(ip);
1166
1167         LOCKSTOP;
1168         return error;
1169 }
1170
1171 static
1172 int
1173 hammer2_vop_nmkdir(struct vop_nmkdir_args *ap)
1174 {
1175         hammer2_inode_t *dip;
1176         hammer2_inode_t *nip;
1177         struct namecache *ncp;
1178         const uint8_t *name;
1179         size_t name_len;
1180         int error;
1181
1182         LOCKSTART;
1183         dip = VTOI(ap->a_dvp);
1184         if (dip->pmp->ronly) {
1185                 LOCKSTOP;
1186                 return (EROFS);
1187         }
1188
1189         ncp = ap->a_nch->ncp;
1190         name = ncp->nc_name;
1191         name_len = ncp->nc_nlen;
1192
1193         hammer2_pfs_memory_wait(dip->pmp);
1194         hammer2_trans_init(dip->pmp, 0);
1195         nip = hammer2_inode_create(dip, ap->a_vap, ap->a_cred,
1196                                    name, name_len, 0,
1197                                    hammer2_trans_newinum(dip->pmp), 0, 0,
1198                                    0, &error);
1199         if (error) {
1200                 KKASSERT(nip == NULL);
1201                 *ap->a_vpp = NULL;
1202         } else {
1203                 *ap->a_vpp = hammer2_igetv(nip, &error);
1204                 hammer2_inode_unlock(nip);
1205         }
1206         hammer2_trans_done(dip->pmp);
1207
1208         if (error == 0) {
1209                 cache_setunresolved(ap->a_nch);
1210                 cache_setvp(ap->a_nch, *ap->a_vpp);
1211         }
1212         LOCKSTOP;
1213         return error;
1214 }
1215
1216 static
1217 int
1218 hammer2_vop_open(struct vop_open_args *ap)
1219 {
1220         return vop_stdopen(ap);
1221 }
1222
1223 /*
1224  * hammer2_vop_advlock { vp, id, op, fl, flags }
1225  */
1226 static
1227 int
1228 hammer2_vop_advlock(struct vop_advlock_args *ap)
1229 {
1230         hammer2_inode_t *ip = VTOI(ap->a_vp);
1231         hammer2_off_t size;
1232
1233         size = ip->meta.size;
1234         return (lf_advlock(ap, &ip->advlock, size));
1235 }
1236
1237 static
1238 int
1239 hammer2_vop_close(struct vop_close_args *ap)
1240 {
1241         return vop_stdclose(ap);
1242 }
1243
1244 /*
1245  * hammer2_vop_nlink { nch, dvp, vp, cred }
1246  *
1247  * Create a hardlink from (vp) to {dvp, nch}.
1248  */
1249 static
1250 int
1251 hammer2_vop_nlink(struct vop_nlink_args *ap)
1252 {
1253         hammer2_xop_nlink_t *xop1;
1254         hammer2_inode_t *fdip;  /* target directory to create link in */
1255         hammer2_inode_t *tdip;  /* target directory to create link in */
1256         hammer2_inode_t *cdip;  /* common parent directory */
1257         hammer2_inode_t *ip;    /* inode we are hardlinking to */
1258         struct namecache *ncp;
1259         const uint8_t *name;
1260         size_t name_len;
1261         int error;
1262
1263         LOCKSTART;
1264         tdip = VTOI(ap->a_dvp);
1265         if (tdip->pmp->ronly) {
1266                 LOCKSTOP;
1267                 return (EROFS);
1268         }
1269
1270         ncp = ap->a_nch->ncp;
1271         name = ncp->nc_name;
1272         name_len = ncp->nc_nlen;
1273
1274         /*
1275          * ip represents the file being hardlinked.  The file could be a
1276          * normal file or a hardlink target if it has already been hardlinked.
1277          * If ip is a hardlinked target then ip->pip represents the location
1278          * of the hardlinked target, NOT the location of the hardlink pointer.
1279          *
1280          * Bump nlinks and potentially also create or move the hardlink
1281          * target in the parent directory common to (ip) and (tdip).  The
1282          * consolidation code can modify ip->cluster and ip->pip.  The
1283          * returned cluster is locked.
1284          */
1285         ip = VTOI(ap->a_vp);
1286         hammer2_pfs_memory_wait(ip->pmp);
1287         hammer2_trans_init(ip->pmp, 0);
1288
1289         /*
1290          * The common parent directory must be locked first to avoid deadlocks.
1291          * Also note that fdip and/or tdip might match cdip.
1292          */
1293         fdip = ip->pip;
1294         cdip = hammer2_inode_common_parent(fdip, tdip);
1295         hammer2_inode_lock(cdip, 0);
1296         hammer2_inode_lock(fdip, 0);
1297         hammer2_inode_lock(tdip, 0);
1298         hammer2_inode_lock(ip, 0);
1299         error = 0;
1300
1301         /*
1302          * If ip is not a hardlink target we must convert it to a hardlink.
1303          * If fdip != cdip we must shift the inode to cdip.
1304          */
1305         if (fdip != cdip || (ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE)) {
1306                 xop1 = hammer2_xop_alloc(fdip, HAMMER2_XOP_MODIFYING);
1307                 hammer2_xop_setip2(&xop1->head, ip);
1308                 hammer2_xop_setip3(&xop1->head, cdip);
1309
1310                 hammer2_xop_start(&xop1->head, hammer2_xop_nlink);
1311                 error = hammer2_xop_collect(&xop1->head, 0);
1312                 hammer2_xop_retire(&xop1->head, HAMMER2_XOPMASK_VOP);
1313                 if (error == ENOENT)
1314                         error = 0;
1315         }
1316
1317         /*
1318          * Must synchronize original inode whos chains are now a hardlink
1319          * target.  We must match what the backend XOP did to the
1320          * chains.
1321          */
1322         if (error == 0 && (ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE)) {
1323                 hammer2_inode_modify(ip);
1324                 ip->meta.name_key = ip->meta.inum;
1325                 ip->meta.name_len = 18; /* "0x%016jx" */
1326         }
1327
1328         /*
1329          * Create the hardlink target and bump nlinks.
1330          */
1331         if (error == 0) {
1332                 hammer2_inode_create(tdip, NULL, NULL,
1333                                      name, name_len, 0,
1334                                      ip->meta.inum,
1335                                      HAMMER2_OBJTYPE_HARDLINK, ip->meta.type,
1336                                      0, &error);
1337                 hammer2_inode_modify(ip);
1338                 ++ip->meta.nlinks;
1339         }
1340         if (error == 0) {
1341                 cache_setunresolved(ap->a_nch);
1342                 cache_setvp(ap->a_nch, ap->a_vp);
1343         }
1344         hammer2_inode_unlock(ip);
1345         hammer2_inode_unlock(tdip);
1346         hammer2_inode_unlock(fdip);
1347         hammer2_inode_unlock(cdip);
1348         hammer2_inode_drop(cdip);
1349         hammer2_trans_done(ip->pmp);
1350
1351         LOCKSTOP;
1352         return error;
1353 }
1354
1355 /*
1356  * hammer2_vop_ncreate { nch, dvp, vpp, cred, vap }
1357  *
1358  * The operating system has already ensured that the directory entry
1359  * does not exist and done all appropriate namespace locking.
1360  */
1361 static
1362 int
1363 hammer2_vop_ncreate(struct vop_ncreate_args *ap)
1364 {
1365         hammer2_inode_t *dip;
1366         hammer2_inode_t *nip;
1367         struct namecache *ncp;
1368         const uint8_t *name;
1369         size_t name_len;
1370         int error;
1371
1372         LOCKSTART;
1373         dip = VTOI(ap->a_dvp);
1374         if (dip->pmp->ronly) {
1375                 LOCKSTOP;
1376                 return (EROFS);
1377         }
1378
1379         ncp = ap->a_nch->ncp;
1380         name = ncp->nc_name;
1381         name_len = ncp->nc_nlen;
1382         hammer2_pfs_memory_wait(dip->pmp);
1383         hammer2_trans_init(dip->pmp, 0);
1384
1385         nip = hammer2_inode_create(dip, ap->a_vap, ap->a_cred,
1386                                    name, name_len, 0,
1387                                    hammer2_trans_newinum(dip->pmp), 0, 0,
1388                                    0, &error);
1389         if (error) {
1390                 KKASSERT(nip == NULL);
1391                 *ap->a_vpp = NULL;
1392         } else {
1393                 *ap->a_vpp = hammer2_igetv(nip, &error);
1394                 hammer2_inode_unlock(nip);
1395         }
1396         hammer2_trans_done(dip->pmp);
1397
1398         if (error == 0) {
1399                 cache_setunresolved(ap->a_nch);
1400                 cache_setvp(ap->a_nch, *ap->a_vpp);
1401         }
1402         LOCKSTOP;
1403         return error;
1404 }
1405
1406 /*
1407  * Make a device node (typically a fifo)
1408  */
1409 static
1410 int
1411 hammer2_vop_nmknod(struct vop_nmknod_args *ap)
1412 {
1413         hammer2_inode_t *dip;
1414         hammer2_inode_t *nip;
1415         struct namecache *ncp;
1416         const uint8_t *name;
1417         size_t name_len;
1418         int error;
1419
1420         LOCKSTART;
1421         dip = VTOI(ap->a_dvp);
1422         if (dip->pmp->ronly) {
1423                 LOCKSTOP;
1424                 return (EROFS);
1425         }
1426
1427         ncp = ap->a_nch->ncp;
1428         name = ncp->nc_name;
1429         name_len = ncp->nc_nlen;
1430         hammer2_pfs_memory_wait(dip->pmp);
1431         hammer2_trans_init(dip->pmp, 0);
1432
1433         nip = hammer2_inode_create(dip, ap->a_vap, ap->a_cred,
1434                                    name, name_len, 0,
1435                                    hammer2_trans_newinum(dip->pmp), 0, 0,
1436                                    0, &error);
1437         if (error) {
1438                 KKASSERT(nip == NULL);
1439                 *ap->a_vpp = NULL;
1440         } else {
1441                 *ap->a_vpp = hammer2_igetv(nip, &error);
1442                 hammer2_inode_unlock(nip);
1443         }
1444         hammer2_trans_done(dip->pmp);
1445
1446         if (error == 0) {
1447                 cache_setunresolved(ap->a_nch);
1448                 cache_setvp(ap->a_nch, *ap->a_vpp);
1449         }
1450         LOCKSTOP;
1451         return error;
1452 }
1453
1454 /*
1455  * hammer2_vop_nsymlink { nch, dvp, vpp, cred, vap, target }
1456  */
1457 static
1458 int
1459 hammer2_vop_nsymlink(struct vop_nsymlink_args *ap)
1460 {
1461         hammer2_inode_t *dip;
1462         hammer2_inode_t *nip;
1463         struct namecache *ncp;
1464         const uint8_t *name;
1465         size_t name_len;
1466         int error;
1467
1468         dip = VTOI(ap->a_dvp);
1469         if (dip->pmp->ronly)
1470                 return (EROFS);
1471
1472         ncp = ap->a_nch->ncp;
1473         name = ncp->nc_name;
1474         name_len = ncp->nc_nlen;
1475         hammer2_pfs_memory_wait(dip->pmp);
1476         hammer2_trans_init(dip->pmp, 0);
1477
1478         ap->a_vap->va_type = VLNK;      /* enforce type */
1479
1480         nip = hammer2_inode_create(dip, ap->a_vap, ap->a_cred,
1481                                    name, name_len, 0,
1482                                    hammer2_trans_newinum(dip->pmp), 0, 0,
1483                                    0, &error);
1484         if (error) {
1485                 KKASSERT(nip == NULL);
1486                 *ap->a_vpp = NULL;
1487                 hammer2_trans_done(dip->pmp);
1488                 return error;
1489         }
1490         *ap->a_vpp = hammer2_igetv(nip, &error);
1491
1492         /*
1493          * Build the softlink (~like file data) and finalize the namecache.
1494          */
1495         if (error == 0) {
1496                 size_t bytes;
1497                 struct uio auio;
1498                 struct iovec aiov;
1499
1500                 bytes = strlen(ap->a_target);
1501
1502                 hammer2_inode_unlock(nip);
1503                 bzero(&auio, sizeof(auio));
1504                 bzero(&aiov, sizeof(aiov));
1505                 auio.uio_iov = &aiov;
1506                 auio.uio_segflg = UIO_SYSSPACE;
1507                 auio.uio_rw = UIO_WRITE;
1508                 auio.uio_resid = bytes;
1509                 auio.uio_iovcnt = 1;
1510                 auio.uio_td = curthread;
1511                 aiov.iov_base = ap->a_target;
1512                 aiov.iov_len = bytes;
1513                 error = hammer2_write_file(nip, &auio, IO_APPEND, 0);
1514                 /* XXX handle error */
1515                 error = 0;
1516         } else {
1517                 hammer2_inode_unlock(nip);
1518         }
1519         hammer2_trans_done(dip->pmp);
1520
1521         /*
1522          * Finalize namecache
1523          */
1524         if (error == 0) {
1525                 cache_setunresolved(ap->a_nch);
1526                 cache_setvp(ap->a_nch, *ap->a_vpp);
1527                 /* hammer2_knote(ap->a_dvp, NOTE_WRITE); */
1528         }
1529         return error;
1530 }
1531
1532 /*
1533  * hammer2_vop_nremove { nch, dvp, cred }
1534  */
1535 static
1536 int
1537 hammer2_vop_nremove(struct vop_nremove_args *ap)
1538 {
1539         hammer2_xop_unlink_t *xop;
1540         hammer2_inode_t *dip;
1541         hammer2_inode_t *ip;
1542         struct namecache *ncp;
1543         int error;
1544         int isopen;
1545
1546         LOCKSTART;
1547         dip = VTOI(ap->a_dvp);
1548         if (dip->pmp->ronly) {
1549                 LOCKSTOP;
1550                 return(EROFS);
1551         }
1552
1553         ncp = ap->a_nch->ncp;
1554
1555         hammer2_pfs_memory_wait(dip->pmp);
1556         hammer2_trans_init(dip->pmp, 0);
1557         hammer2_inode_lock(dip, 0);
1558
1559         /*
1560          * The unlink XOP unlinks the path from the directory and
1561          * locates and returns the cluster associated with the real inode.
1562          * We have to handle nlinks here on the frontend.
1563          */
1564         xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING);
1565         hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen);
1566         isopen = cache_isopen(ap->a_nch);
1567         xop->isdir = 0;
1568         xop->dopermanent = isopen ?  0 : HAMMER2_DELETE_PERMANENT;
1569         hammer2_xop_start(&xop->head, hammer2_xop_unlink);
1570
1571         /*
1572          * Collect the real inode and adjust nlinks, destroy the real
1573          * inode if nlinks transitions to 0 and it was the real inode
1574          * (else it has already been removed).
1575          */
1576         error = hammer2_xop_collect(&xop->head, 0);
1577         hammer2_inode_unlock(dip);
1578
1579         if (error == 0) {
1580                 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1);
1581                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1582                 if (ip) {
1583                         hammer2_inode_unlink_finisher(ip, isopen);
1584                         hammer2_inode_unlock(ip);
1585                 }
1586         } else {
1587                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1588         }
1589
1590         hammer2_inode_run_unlinkq(dip->pmp);
1591         hammer2_trans_done(dip->pmp);
1592         if (error == 0)
1593                 cache_unlink(ap->a_nch);
1594         LOCKSTOP;
1595         return (error);
1596 }
1597
1598 /*
1599  * hammer2_vop_nrmdir { nch, dvp, cred }
1600  */
1601 static
1602 int
1603 hammer2_vop_nrmdir(struct vop_nrmdir_args *ap)
1604 {
1605         hammer2_xop_unlink_t *xop;
1606         hammer2_inode_t *dip;
1607         hammer2_inode_t *ip;
1608         struct namecache *ncp;
1609         int isopen;
1610         int error;
1611
1612         LOCKSTART;
1613         dip = VTOI(ap->a_dvp);
1614         if (dip->pmp->ronly) {
1615                 LOCKSTOP;
1616                 return(EROFS);
1617         }
1618
1619         hammer2_pfs_memory_wait(dip->pmp);
1620         hammer2_trans_init(dip->pmp, 0);
1621         hammer2_inode_lock(dip, 0);
1622
1623         xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING);
1624
1625         ncp = ap->a_nch->ncp;
1626         hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen);
1627         isopen = cache_isopen(ap->a_nch);
1628         xop->isdir = 1;
1629         xop->dopermanent = isopen ?  0 : HAMMER2_DELETE_PERMANENT;
1630         hammer2_xop_start(&xop->head, hammer2_xop_unlink);
1631
1632         /*
1633          * Collect the real inode and adjust nlinks, destroy the real
1634          * inode if nlinks transitions to 0 and it was the real inode
1635          * (else it has already been removed).
1636          */
1637         error = hammer2_xop_collect(&xop->head, 0);
1638         hammer2_inode_unlock(dip);
1639
1640         if (error == 0) {
1641                 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1);
1642                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1643                 if (ip) {
1644                         hammer2_inode_unlink_finisher(ip, isopen);
1645                         hammer2_inode_unlock(ip);
1646                 }
1647         } else {
1648                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1649         }
1650         hammer2_inode_run_unlinkq(dip->pmp);
1651         hammer2_trans_done(dip->pmp);
1652         if (error == 0)
1653                 cache_unlink(ap->a_nch);
1654         LOCKSTOP;
1655         return (error);
1656 }
1657
1658 /*
1659  * hammer2_vop_nrename { fnch, tnch, fdvp, tdvp, cred }
1660  */
1661 static
1662 int
1663 hammer2_vop_nrename(struct vop_nrename_args *ap)
1664 {
1665         struct namecache *fncp;
1666         struct namecache *tncp;
1667         hammer2_inode_t *cdip;
1668         hammer2_inode_t *fdip;
1669         hammer2_inode_t *tdip;
1670         hammer2_inode_t *ip;
1671         const uint8_t *fname;
1672         size_t fname_len;
1673         const uint8_t *tname;
1674         size_t tname_len;
1675         int error;
1676         int tnch_error;
1677         hammer2_key_t tlhc;
1678
1679         if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount)
1680                 return(EXDEV);
1681         if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount)
1682                 return(EXDEV);
1683
1684         fdip = VTOI(ap->a_fdvp);        /* source directory */
1685         tdip = VTOI(ap->a_tdvp);        /* target directory */
1686
1687         if (fdip->pmp->ronly)
1688                 return(EROFS);
1689
1690         LOCKSTART;
1691         fncp = ap->a_fnch->ncp;         /* entry name in source */
1692         fname = fncp->nc_name;
1693         fname_len = fncp->nc_nlen;
1694
1695         tncp = ap->a_tnch->ncp;         /* entry name in target */
1696         tname = tncp->nc_name;
1697         tname_len = tncp->nc_nlen;
1698
1699         hammer2_pfs_memory_wait(tdip->pmp);
1700         hammer2_trans_init(tdip->pmp, 0);
1701
1702         /*
1703          * ip is the inode being renamed.  If this is a hardlink then
1704          * ip represents the actual file and not the hardlink marker.
1705          */
1706         ip = VTOI(fncp->nc_vp);
1707
1708         /*
1709          * The common parent directory must be locked first to avoid deadlocks.
1710          * Also note that fdip and/or tdip might match cdip.
1711          */
1712         cdip = hammer2_inode_common_parent(ip->pip, tdip);
1713         hammer2_inode_lock(cdip, 0);
1714         hammer2_inode_lock(fdip, 0);
1715         hammer2_inode_lock(tdip, 0);
1716         hammer2_inode_ref(ip);          /* extra ref */
1717         error = 0;
1718
1719         /*
1720          * If ip is a hardlink target and fdip != cdip we must shift the
1721          * inode to cdip.
1722          */
1723         if (fdip != cdip &&
1724             (ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE) == 0) {
1725                 hammer2_xop_nlink_t *xop1;
1726
1727                 xop1 = hammer2_xop_alloc(fdip, HAMMER2_XOP_MODIFYING);
1728                 hammer2_xop_setip2(&xop1->head, ip);
1729                 hammer2_xop_setip3(&xop1->head, cdip);
1730
1731                 hammer2_xop_start(&xop1->head, hammer2_xop_nlink);
1732                 error = hammer2_xop_collect(&xop1->head, 0);
1733                 hammer2_xop_retire(&xop1->head, HAMMER2_XOPMASK_VOP);
1734         }
1735
1736         /*
1737          * Delete the target namespace.
1738          */
1739         {
1740                 hammer2_xop_unlink_t *xop2;
1741                 hammer2_inode_t *tip;
1742                 int isopen;
1743
1744                 /*
1745                  * The unlink XOP unlinks the path from the directory and
1746                  * locates and returns the cluster associated with the real
1747                  * inode.  We have to handle nlinks here on the frontend.
1748                  */
1749                 xop2 = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING);
1750                 hammer2_xop_setname(&xop2->head, tname, tname_len);
1751                 isopen = cache_isopen(ap->a_tnch);
1752                 xop2->isdir = -1;
1753                 xop2->dopermanent = isopen ?  0 : HAMMER2_DELETE_PERMANENT;
1754                 hammer2_xop_start(&xop2->head, hammer2_xop_unlink);
1755
1756                 /*
1757                  * Collect the real inode and adjust nlinks, destroy the real
1758                  * inode if nlinks transitions to 0 and it was the real inode
1759                  * (else it has already been removed).
1760                  */
1761                 tnch_error = hammer2_xop_collect(&xop2->head, 0);
1762                 /* hammer2_inode_unlock(tdip); */
1763
1764                 if (tnch_error == 0) {
1765                         tip = hammer2_inode_get(tdip->pmp, NULL,
1766                                                 &xop2->head.cluster, -1);
1767                         hammer2_xop_retire(&xop2->head, HAMMER2_XOPMASK_VOP);
1768                         if (tip) {
1769                                 hammer2_inode_unlink_finisher(tip, isopen);
1770                                 hammer2_inode_unlock(tip);
1771                         }
1772                 } else {
1773                         hammer2_xop_retire(&xop2->head, HAMMER2_XOPMASK_VOP);
1774                 }
1775                 /* hammer2_inode_lock(tdip, 0); */
1776
1777                 if (tnch_error && tnch_error != ENOENT) {
1778                         error = tnch_error;
1779                         goto done2;
1780                 }
1781         }
1782
1783         /*
1784          * Resolve the collision space for (tdip, tname, tname_len)
1785          *
1786          * tdip must be held exclusively locked to prevent races.
1787          */
1788         {
1789                 hammer2_xop_scanlhc_t *sxop;
1790                 hammer2_tid_t lhcbase;
1791
1792                 tlhc = hammer2_dirhash(tname, tname_len);
1793                 lhcbase = tlhc;
1794                 sxop = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING);
1795                 sxop->lhc = tlhc;
1796                 hammer2_xop_start(&sxop->head, hammer2_xop_scanlhc);
1797                 while ((error = hammer2_xop_collect(&sxop->head, 0)) == 0) {
1798                         if (tlhc != sxop->head.cluster.focus->bref.key)
1799                                 break;
1800                         ++tlhc;
1801                 }
1802                 hammer2_xop_retire(&sxop->head, HAMMER2_XOPMASK_VOP);
1803
1804                 if (error) {
1805                         if (error != ENOENT)
1806                                 goto done2;
1807                         ++tlhc;
1808                         error = 0;
1809                 }
1810                 if ((lhcbase ^ tlhc) & ~HAMMER2_DIRHASH_LOMASK) {
1811                         error = ENOSPC;
1812                         goto done2;
1813                 }
1814         }
1815
1816         /*
1817          * Everything is setup, do the rename.
1818          *
1819          * We have to synchronize ip->meta to the underlying operation.
1820          *
1821          * NOTE: To avoid deadlocks we cannot lock (ip) while we are
1822          *       unlinking elements from their directories.  Locking
1823          *       the nlinks field does not lock the whole inode.
1824          */
1825         hammer2_inode_lock(ip, 0);
1826         if (error == 0) {
1827                 hammer2_xop_nrename_t *xop4;
1828
1829                 xop4 = hammer2_xop_alloc(fdip, HAMMER2_XOP_MODIFYING);
1830                 xop4->lhc = tlhc;
1831                 xop4->ip_key = ip->meta.name_key;
1832                 hammer2_xop_setip2(&xop4->head, ip);
1833                 hammer2_xop_setip3(&xop4->head, tdip);
1834                 hammer2_xop_setname(&xop4->head, fname, fname_len);
1835                 hammer2_xop_setname2(&xop4->head, tname, tname_len);
1836                 hammer2_xop_start(&xop4->head, hammer2_xop_nrename);
1837
1838                 error = hammer2_xop_collect(&xop4->head, 0);
1839                 hammer2_xop_retire(&xop4->head, HAMMER2_XOPMASK_VOP);
1840
1841                 if (error == ENOENT)
1842                         error = 0;
1843                 if (error == 0 &&
1844                     (ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE)) {
1845                         hammer2_inode_modify(ip);
1846                         ip->meta.name_len = tname_len;
1847                         ip->meta.name_key = tlhc;
1848
1849                 }
1850         }
1851
1852         /*
1853          * Fixup ip->pip if we were renaming the actual file and not a
1854          * hardlink pointer.
1855          */
1856         if (error == 0 && (ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE)) {
1857                 hammer2_inode_t *opip;
1858
1859                 if (ip->pip != tdip) {
1860                         hammer2_inode_ref(tdip);
1861                         opip = ip->pip;
1862                         ip->pip = tdip;
1863                         if (opip)
1864                                 hammer2_inode_drop(opip);
1865                 }
1866         }
1867         hammer2_inode_unlock(ip);
1868 done2:
1869         hammer2_inode_unlock(tdip);
1870         hammer2_inode_unlock(fdip);
1871         hammer2_inode_unlock(cdip);
1872         hammer2_inode_drop(ip);
1873         hammer2_inode_drop(cdip);
1874         hammer2_inode_run_unlinkq(fdip->pmp);
1875         hammer2_trans_done(tdip->pmp);
1876
1877         /*
1878          * Issue the namecache update after unlocking all the internal
1879          * hammer structures, otherwise we might deadlock.
1880          */
1881         if (tnch_error == 0) {
1882                 cache_unlink(ap->a_tnch);
1883                 cache_setunresolved(ap->a_tnch);
1884         }
1885         if (error == 0)
1886                 cache_rename(ap->a_fnch, ap->a_tnch);
1887
1888         LOCKSTOP;
1889         return (error);
1890 }
1891
1892 /*
1893  * hammer2_vop_ioctl { vp, command, data, fflag, cred }
1894  */
1895 static
1896 int
1897 hammer2_vop_ioctl(struct vop_ioctl_args *ap)
1898 {
1899         hammer2_inode_t *ip;
1900         int error;
1901
1902         LOCKSTART;
1903         ip = VTOI(ap->a_vp);
1904
1905         error = hammer2_ioctl(ip, ap->a_command, (void *)ap->a_data,
1906                               ap->a_fflag, ap->a_cred);
1907         LOCKSTOP;
1908         return (error);
1909 }
1910
1911 static
1912 int
1913 hammer2_vop_mountctl(struct vop_mountctl_args *ap)
1914 {
1915         struct mount *mp;
1916         hammer2_pfs_t *pmp;
1917         int rc;
1918
1919         LOCKSTART;
1920         switch (ap->a_op) {
1921         case (MOUNTCTL_SET_EXPORT):
1922                 mp = ap->a_head.a_ops->head.vv_mount;
1923                 pmp = MPTOPMP(mp);
1924
1925                 if (ap->a_ctllen != sizeof(struct export_args))
1926                         rc = (EINVAL);
1927                 else
1928                         rc = vfs_export(mp, &pmp->export,
1929                                         (const struct export_args *)ap->a_ctl);
1930                 break;
1931         default:
1932                 rc = vop_stdmountctl(ap);
1933                 break;
1934         }
1935         LOCKSTOP;
1936         return (rc);
1937 }
1938
1939 /*
1940  * KQFILTER
1941  */
1942 static void filt_hammer2detach(struct knote *kn);
1943 static int filt_hammer2read(struct knote *kn, long hint);
1944 static int filt_hammer2write(struct knote *kn, long hint);
1945 static int filt_hammer2vnode(struct knote *kn, long hint);
1946
1947 static struct filterops hammer2read_filtops =
1948         { FILTEROP_ISFD | FILTEROP_MPSAFE,
1949           NULL, filt_hammer2detach, filt_hammer2read };
1950 static struct filterops hammer2write_filtops =
1951         { FILTEROP_ISFD | FILTEROP_MPSAFE,
1952           NULL, filt_hammer2detach, filt_hammer2write };
1953 static struct filterops hammer2vnode_filtops =
1954         { FILTEROP_ISFD | FILTEROP_MPSAFE,
1955           NULL, filt_hammer2detach, filt_hammer2vnode };
1956
1957 static
1958 int
1959 hammer2_vop_kqfilter(struct vop_kqfilter_args *ap)
1960 {
1961         struct vnode *vp = ap->a_vp;
1962         struct knote *kn = ap->a_kn;
1963
1964         switch (kn->kn_filter) {
1965         case EVFILT_READ:
1966                 kn->kn_fop = &hammer2read_filtops;
1967                 break;
1968         case EVFILT_WRITE:
1969                 kn->kn_fop = &hammer2write_filtops;
1970                 break;
1971         case EVFILT_VNODE:
1972                 kn->kn_fop = &hammer2vnode_filtops;
1973                 break;
1974         default:
1975                 return (EOPNOTSUPP);
1976         }
1977
1978         kn->kn_hook = (caddr_t)vp;
1979
1980         knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
1981
1982         return(0);
1983 }
1984
1985 static void
1986 filt_hammer2detach(struct knote *kn)
1987 {
1988         struct vnode *vp = (void *)kn->kn_hook;
1989
1990         knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
1991 }
1992
1993 static int
1994 filt_hammer2read(struct knote *kn, long hint)
1995 {
1996         struct vnode *vp = (void *)kn->kn_hook;
1997         hammer2_inode_t *ip = VTOI(vp);
1998         off_t off;
1999
2000         if (hint == NOTE_REVOKE) {
2001                 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT);
2002                 return(1);
2003         }
2004         off = ip->meta.size - kn->kn_fp->f_offset;
2005         kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX;
2006         if (kn->kn_sfflags & NOTE_OLDAPI)
2007                 return(1);
2008         return (kn->kn_data != 0);
2009 }
2010
2011
2012 static int
2013 filt_hammer2write(struct knote *kn, long hint)
2014 {
2015         if (hint == NOTE_REVOKE)
2016                 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT);
2017         kn->kn_data = 0;
2018         return (1);
2019 }
2020
2021 static int
2022 filt_hammer2vnode(struct knote *kn, long hint)
2023 {
2024         if (kn->kn_sfflags & hint)
2025                 kn->kn_fflags |= hint;
2026         if (hint == NOTE_REVOKE) {
2027                 kn->kn_flags |= (EV_EOF | EV_NODATA);
2028                 return (1);
2029         }
2030         return (kn->kn_fflags != 0);
2031 }
2032
2033 /*
2034  * FIFO VOPS
2035  */
2036 static
2037 int
2038 hammer2_vop_markatime(struct vop_markatime_args *ap)
2039 {
2040         hammer2_inode_t *ip;
2041         struct vnode *vp;
2042
2043         vp = ap->a_vp;
2044         ip = VTOI(vp);
2045
2046         if (ip->pmp->ronly)
2047                 return(EROFS);
2048         return(0);
2049 }
2050
2051 static
2052 int
2053 hammer2_vop_fifokqfilter(struct vop_kqfilter_args *ap)
2054 {
2055         int error;
2056
2057         error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2058         if (error)
2059                 error = hammer2_vop_kqfilter(ap);
2060         return(error);
2061 }
2062
2063 /*
2064  * VOPS vector
2065  */
2066 struct vop_ops hammer2_vnode_vops = {
2067         .vop_default    = vop_defaultop,
2068         .vop_fsync      = hammer2_vop_fsync,
2069         .vop_getpages   = vop_stdgetpages,
2070         .vop_putpages   = vop_stdputpages,
2071         .vop_access     = hammer2_vop_access,
2072         .vop_advlock    = hammer2_vop_advlock,
2073         .vop_close      = hammer2_vop_close,
2074         .vop_nlink      = hammer2_vop_nlink,
2075         .vop_ncreate    = hammer2_vop_ncreate,
2076         .vop_nsymlink   = hammer2_vop_nsymlink,
2077         .vop_nremove    = hammer2_vop_nremove,
2078         .vop_nrmdir     = hammer2_vop_nrmdir,
2079         .vop_nrename    = hammer2_vop_nrename,
2080         .vop_getattr    = hammer2_vop_getattr,
2081         .vop_setattr    = hammer2_vop_setattr,
2082         .vop_readdir    = hammer2_vop_readdir,
2083         .vop_readlink   = hammer2_vop_readlink,
2084         .vop_getpages   = vop_stdgetpages,
2085         .vop_putpages   = vop_stdputpages,
2086         .vop_read       = hammer2_vop_read,
2087         .vop_write      = hammer2_vop_write,
2088         .vop_open       = hammer2_vop_open,
2089         .vop_inactive   = hammer2_vop_inactive,
2090         .vop_reclaim    = hammer2_vop_reclaim,
2091         .vop_nresolve   = hammer2_vop_nresolve,
2092         .vop_nlookupdotdot = hammer2_vop_nlookupdotdot,
2093         .vop_nmkdir     = hammer2_vop_nmkdir,
2094         .vop_nmknod     = hammer2_vop_nmknod,
2095         .vop_ioctl      = hammer2_vop_ioctl,
2096         .vop_mountctl   = hammer2_vop_mountctl,
2097         .vop_bmap       = hammer2_vop_bmap,
2098         .vop_strategy   = hammer2_vop_strategy,
2099         .vop_kqfilter   = hammer2_vop_kqfilter
2100 };
2101
2102 struct vop_ops hammer2_spec_vops = {
2103         .vop_default =          vop_defaultop,
2104         .vop_fsync =            hammer2_vop_fsync,
2105         .vop_read =             vop_stdnoread,
2106         .vop_write =            vop_stdnowrite,
2107         .vop_access =           hammer2_vop_access,
2108         .vop_close =            hammer2_vop_close,
2109         .vop_markatime =        hammer2_vop_markatime,
2110         .vop_getattr =          hammer2_vop_getattr,
2111         .vop_inactive =         hammer2_vop_inactive,
2112         .vop_reclaim =          hammer2_vop_reclaim,
2113         .vop_setattr =          hammer2_vop_setattr
2114 };
2115
2116 struct vop_ops hammer2_fifo_vops = {
2117         .vop_default =          fifo_vnoperate,
2118         .vop_fsync =            hammer2_vop_fsync,
2119 #if 0
2120         .vop_read =             hammer2_vop_fiforead,
2121         .vop_write =            hammer2_vop_fifowrite,
2122 #endif
2123         .vop_access =           hammer2_vop_access,
2124 #if 0
2125         .vop_close =            hammer2_vop_fifoclose,
2126 #endif
2127         .vop_markatime =        hammer2_vop_markatime,
2128         .vop_getattr =          hammer2_vop_getattr,
2129         .vop_inactive =         hammer2_vop_inactive,
2130         .vop_reclaim =          hammer2_vop_reclaim,
2131         .vop_setattr =          hammer2_vop_setattr,
2132         .vop_kqfilter =         hammer2_vop_fifokqfilter
2133 };
2134