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          * Note that deleting the file block chains under the inode chain
 108          * would just be a waste of energy, so don't do it.
 109          *
 110          * WARNING: nvtruncbuf() can only be safely called without the inode
 111          *          lock held due to the way our write thread works.
 112          */
 113         if (ip->flags & HAMMER2_INODE_ISUNLINKED) {
 114                 hammer2_key_t lbase;
 115                 int nblksize;
 116
 117                 /*
 118                  * Detect updates to the embedded data which may be
 119                  * synchronized by the strategy code.  Simply mark the
 120                  * inode modified so it gets picked up by our normal flush.
 121                  */
 122                 nblksize = hammer2_calc_logical(ip, 0, &lbase, NULL);
 123                 nvtruncbuf(vp, 0, nblksize, 0, 0);
 124                 vrecycle(vp);
 125         }
 126         LOCKSTOP;
 127         return (0);
 128 }
 129
 130 /*
 131  * Reclaim a vnode so that it can be reused; after the inode is
 132  * disassociated, the filesystem must manage it alone.
 133  */
 134 static
 135 int
 136 hammer2_vop_reclaim(struct vop_reclaim_args *ap)
 137 {
 138         hammer2_inode_t *ip;
 139         hammer2_pfs_t *pmp;
 140         struct vnode *vp;
 141
 142         LOCKSTART;
 143         vp = ap->a_vp;
 144         ip = VTOI(vp);
 145         if (ip == NULL) {
 146                 LOCKSTOP;
 147                 return(0);
 148         }
 149         pmp = ip->pmp;
 150
 151         /*
 152          * The final close of a deleted file or directory marks it for
 153          * destruction.  The DELETED flag allows the flusher to shortcut
 154          * any modified blocks still unflushed (that is, just ignore them).
 155          *
 156          * HAMMER2 usually does not try to optimize the freemap by returning
 157          * deleted blocks to it as it does not usually know how many snapshots
 158          * might be referencing portions of the file/dir.
 159          */
 160         vp->v_data = NULL;
 161         ip->vp = NULL;
 162
 163         /*
 164          * NOTE! We do not attempt to flush chains here, flushing is
 165          *       really fragile and could also deadlock.
 166          */
 167         vclrisdirty(vp);
 168
 169         /*
 170          * This occurs if the inode was unlinked while open.  Reclamation of
 171          * these inodes requires processing we cannot safely do here so add
 172          * the inode to the sideq in that situation.
 173          *
 174          * A modified inode may require chain synchronization which will no
 175          * longer be driven by a sync or fsync without the vnode, also use
 176          * the sideq for that.
 177          *
 178          * A reclaim can occur at any time so we cannot safely start a
 179          * transaction to handle reclamation of unlinked files.  Instead,
 180          * the ip is left with a reference and placed on a linked list and
 181          * handled later on.
 182          */
 183
 184         if ((ip->flags & (HAMMER2_INODE_ISUNLINKED |
 185                           HAMMER2_INODE_MODIFIED |
 186                           HAMMER2_INODE_RESIZED)) &&
 187             (ip->flags & HAMMER2_INODE_ISDELETED) == 0) {
 188                 hammer2_inode_sideq_t *ipul;
 189
 190                 ipul = kmalloc(sizeof(*ipul), pmp->minode, M_WAITOK | M_ZERO);
 191                 ipul->ip = ip;
 192
 193                 hammer2_spin_ex(&pmp->list_spin);
 194                 if ((ip->flags & HAMMER2_INODE_ONSIDEQ) == 0) {
 195                         /* ref -> sideq */
 196                         atomic_set_int(&ip->flags, HAMMER2_INODE_ONSIDEQ);
 197                         TAILQ_INSERT_TAIL(&pmp->sideq, ipul, entry);
 198                         hammer2_spin_unex(&pmp->list_spin);
 199                 } else {
 200                         hammer2_spin_unex(&pmp->list_spin);
 201                         kfree(ipul, pmp->minode);
 202                         hammer2_inode_drop(ip);         /* vp ref */
 203                 }
 204                 /* retain ref from vp for ipul */
 205         } else {
 206                 hammer2_inode_drop(ip);                 /* vp ref */
 207         }
 208
 209         /*
 210          * XXX handle background sync when ip dirty, kernel will no longer
 211          * notify us regarding this inode because there is no longer a
 212          * vnode attached to it.
 213          */
 214
 215         LOCKSTOP;
 216         return (0);
 217 }
 218
 219 static
 220 int
 221 hammer2_vop_fsync(struct vop_fsync_args *ap)
 222 {
 223         hammer2_inode_t *ip;
 224         struct vnode *vp;
 225
 226         LOCKSTART;
 227         vp = ap->a_vp;
 228         ip = VTOI(vp);
 229
 230 #if 0
 231         /* XXX can't do this yet */
 232         hammer2_trans_init(ip->pmp, HAMMER2_TRANS_ISFLUSH);
 233         vfsync(vp, ap->a_waitfor, 1, NULL, NULL);
 234 #endif
 235         hammer2_trans_init(ip->pmp, 0);
 236         vfsync(vp, ap->a_waitfor, 1, NULL, NULL);
 237
 238         /*
 239          * Calling chain_flush here creates a lot of duplicative
 240          * COW operations due to non-optimal vnode ordering.
 241          *
 242          * Only do it for an actual fsync() syscall.  The other forms
 243          * which call this function will eventually call chain_flush
 244          * on the volume root as a catch-all, which is far more optimal.
 245          */
 246         hammer2_inode_lock(ip, 0);
 247         if (ip->flags & HAMMER2_INODE_MODIFIED)
 248                 hammer2_inode_chain_sync(ip);
 249         hammer2_inode_unlock(ip);
 250         hammer2_trans_done(ip->pmp);
 251
 252         LOCKSTOP;
 253         return (0);
 254 }
 255
 256 static
 257 int
 258 hammer2_vop_access(struct vop_access_args *ap)
 259 {
 260         hammer2_inode_t *ip = VTOI(ap->a_vp);
 261         uid_t uid;
 262         gid_t gid;
 263         int error;
 264
 265         LOCKSTART;
 266         hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
 267         uid = hammer2_to_unix_xid(&ip->meta.uid);
 268         gid = hammer2_to_unix_xid(&ip->meta.gid);
 269         error = vop_helper_access(ap, uid, gid, ip->meta.mode, ip->meta.uflags);
 270         hammer2_inode_unlock(ip);
 271
 272         LOCKSTOP;
 273         return (error);
 274 }
 275
 276 static
 277 int
 278 hammer2_vop_getattr(struct vop_getattr_args *ap)
 279 {
 280         hammer2_pfs_t *pmp;
 281         hammer2_inode_t *ip;
 282         struct vnode *vp;
 283         struct vattr *vap;
 284         hammer2_chain_t *chain;
 285         int i;
 286
 287         LOCKSTART;
 288         vp = ap->a_vp;
 289         vap = ap->a_vap;
 290
 291         ip = VTOI(vp);
 292         pmp = ip->pmp;
 293
 294         hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
 295
 296         vap->va_fsid = pmp->mp->mnt_stat.f_fsid.val[0];
 297         vap->va_fileid = ip->meta.inum;
 298         vap->va_mode = ip->meta.mode;
 299         vap->va_nlink = ip->meta.nlinks;
 300         vap->va_uid = hammer2_to_unix_xid(&ip->meta.uid);
 301         vap->va_gid = hammer2_to_unix_xid(&ip->meta.gid);
 302         vap->va_rmajor = 0;
 303         vap->va_rminor = 0;
 304         vap->va_size = ip->meta.size;   /* protected by shared lock */
 305         vap->va_blocksize = HAMMER2_PBUFSIZE;
 306         vap->va_flags = ip->meta.uflags;
 307         hammer2_time_to_timespec(ip->meta.ctime, &vap->va_ctime);
 308         hammer2_time_to_timespec(ip->meta.mtime, &vap->va_mtime);
 309         hammer2_time_to_timespec(ip->meta.mtime, &vap->va_atime);
 310         vap->va_gen = 1;
 311         vap->va_bytes = 0;
 312         if (ip->meta.type == HAMMER2_OBJTYPE_DIRECTORY) {
 313                 /*
 314                  * Can't really calculate directory use sans the files under
 315                  * it, just assume one block for now.
 316                  */
 317                 vap->va_bytes += HAMMER2_INODE_BYTES;
 318         } else {
 319                 for (i = 0; i < ip->cluster.nchains; ++i) {
 320                         if ((chain = ip->cluster.array[i].chain) != NULL) {
 321                                 if (vap->va_bytes <
 322                                     chain->bref.embed.stats.data_count) {
 323                                         vap->va_bytes =
 324                                             chain->bref.embed.stats.data_count;
 325                                 }
 326                         }
 327                 }
 328         }
 329         vap->va_type = hammer2_get_vtype(ip->meta.type);
 330         vap->va_filerev = 0;
 331         vap->va_uid_uuid = ip->meta.uid;
 332         vap->va_gid_uuid = ip->meta.gid;
 333         vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID |
 334                           VA_FSID_UUID_VALID;
 335
 336         hammer2_inode_unlock(ip);
 337
 338         LOCKSTOP;
 339         return (0);
 340 }
 341
 342 static
 343 int
 344 hammer2_vop_setattr(struct vop_setattr_args *ap)
 345 {
 346         hammer2_inode_t *ip;
 347         struct vnode *vp;
 348         struct vattr *vap;
 349         int error;
 350         int kflags = 0;
 351         uint64_t ctime;
 352
 353         LOCKSTART;
 354         vp = ap->a_vp;
 355         vap = ap->a_vap;
 356         hammer2_update_time(&ctime);
 357
 358         ip = VTOI(vp);
 359
 360         if (ip->pmp->ronly) {
 361                 LOCKSTOP;
 362                 return(EROFS);
 363         }
 364
 365         hammer2_pfs_memory_wait(ip->pmp);
 366         hammer2_trans_init(ip->pmp, 0);
 367         hammer2_inode_lock(ip, 0);
 368         error = 0;
 369
 370         if (vap->va_flags != VNOVAL) {
 371                 uint32_t flags;
 372
 373                 flags = ip->meta.uflags;
 374                 error = vop_helper_setattr_flags(&flags, vap->va_flags,
 375                                      hammer2_to_unix_xid(&ip->meta.uid),
 376                                      ap->a_cred);
 377                 if (error == 0) {
 378                         if (ip->meta.uflags != flags) {
 379                                 hammer2_inode_modify(ip);
 380                                 ip->meta.uflags = flags;
 381                                 ip->meta.ctime = ctime;
 382                                 kflags |= NOTE_ATTRIB;
 383                         }
 384                         if (ip->meta.uflags & (IMMUTABLE | APPEND)) {
 385                                 error = 0;
 386                                 goto done;
 387                         }
 388                 }
 389                 goto done;
 390         }
 391         if (ip->meta.uflags & (IMMUTABLE | APPEND)) {
 392                 error = EPERM;
 393                 goto done;
 394         }
 395         if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
 396                 mode_t cur_mode = ip->meta.mode;
 397                 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid);
 398                 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid);
 399                 uuid_t uuid_uid;
 400                 uuid_t uuid_gid;
 401
 402                 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid,
 403                                          ap->a_cred,
 404                                          &cur_uid, &cur_gid, &cur_mode);
 405                 if (error == 0) {
 406                         hammer2_guid_to_uuid(&uuid_uid, cur_uid);
 407                         hammer2_guid_to_uuid(&uuid_gid, cur_gid);
 408                         if (bcmp(&uuid_uid, &ip->meta.uid, sizeof(uuid_uid)) ||
 409                             bcmp(&uuid_gid, &ip->meta.gid, sizeof(uuid_gid)) ||
 410                             ip->meta.mode != cur_mode
 411                         ) {
 412                                 hammer2_inode_modify(ip);
 413                                 ip->meta.uid = uuid_uid;
 414                                 ip->meta.gid = uuid_gid;
 415                                 ip->meta.mode = cur_mode;
 416                                 ip->meta.ctime = ctime;
 417                         }
 418                         kflags |= NOTE_ATTRIB;
 419                 }
 420         }
 421
 422         /*
 423          * Resize the file
 424          */
 425         if (vap->va_size != VNOVAL && ip->meta.size != vap->va_size) {
 426                 switch(vp->v_type) {
 427                 case VREG:
 428                         if (vap->va_size == ip->meta.size)
 429                                 break;
 430                         if (vap->va_size < ip->meta.size) {
 431                                 hammer2_mtx_ex(&ip->truncate_lock);
 432                                 hammer2_truncate_file(ip, vap->va_size);
 433                                 hammer2_mtx_unlock(&ip->truncate_lock);
 434                         } else {
 435                                 hammer2_extend_file(ip, vap->va_size);
 436                         }
 437                         hammer2_inode_modify(ip);
 438                         ip->meta.mtime = ctime;
 439                         break;
 440                 default:
 441                         error = EINVAL;
 442                         goto done;
 443                 }
 444         }
 445 #if 0
 446         /* atime not supported */
 447         if (vap->va_atime.tv_sec != VNOVAL) {
 448                 hammer2_inode_modify(ip);
 449                 ip->meta.atime = hammer2_timespec_to_time(&vap->va_atime);
 450                 kflags |= NOTE_ATTRIB;
 451         }
 452 #endif
 453         if (vap->va_mode != (mode_t)VNOVAL) {
 454                 mode_t cur_mode = ip->meta.mode;
 455                 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid);
 456                 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid);
 457
 458                 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred,
 459                                          cur_uid, cur_gid, &cur_mode);
 460                 if (error == 0 && ip->meta.mode != cur_mode) {
 461                         hammer2_inode_modify(ip);
 462                         ip->meta.mode = cur_mode;
 463                         ip->meta.ctime = ctime;
 464                         kflags |= NOTE_ATTRIB;
 465                 }
 466         }
 467
 468         if (vap->va_mtime.tv_sec != VNOVAL) {
 469                 hammer2_inode_modify(ip);
 470                 ip->meta.mtime = hammer2_timespec_to_time(&vap->va_mtime);
 471                 kflags |= NOTE_ATTRIB;
 472         }
 473
 474 done:
 475         /*
 476          * If a truncation occurred we must call inode_fsync() now in order
 477          * to trim the related data chains, otherwise a later expansion can
 478          * cause havoc.
 479          *
 480          * If an extend occured that changed the DIRECTDATA state, we must
 481          * call inode_fsync now in order to prepare the inode's indirect
 482          * block table.
 483          */
 484         if (ip->flags & HAMMER2_INODE_RESIZED)
 485                 hammer2_inode_chain_sync(ip);
 486
 487         /*
 488          * Cleanup.
 489          */
 490         hammer2_inode_unlock(ip);
 491         hammer2_trans_done(ip->pmp);
 492         hammer2_knote(ip->vp, kflags);
 493
 494         LOCKSTOP;
 495         return (error);
 496 }
 497
 498 static
 499 int
 500 hammer2_vop_readdir(struct vop_readdir_args *ap)
 501 {
 502         hammer2_xop_readdir_t *xop;
 503         hammer2_blockref_t bref;
 504         hammer2_inode_t *ip;
 505         hammer2_tid_t inum;
 506         hammer2_key_t lkey;
 507         struct uio *uio;
 508         off_t *cookies;
 509         off_t saveoff;
 510         int cookie_index;
 511         int ncookies;
 512         int error;
 513         int eofflag;
 514         int r;
 515
 516         LOCKSTART;
 517         ip = VTOI(ap->a_vp);
 518         uio = ap->a_uio;
 519         saveoff = uio->uio_offset;
 520         eofflag = 0;
 521         error = 0;
 522
 523         /*
 524          * Setup cookies directory entry cookies if requested
 525          */
 526         if (ap->a_ncookies) {
 527                 ncookies = uio->uio_resid / 16 + 1;
 528                 if (ncookies > 1024)
 529                         ncookies = 1024;
 530                 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
 531         } else {
 532                 ncookies = -1;
 533                 cookies = NULL;
 534         }
 535         cookie_index = 0;
 536
 537         hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
 538
 539         /*
 540          * Handle artificial entries.  To ensure that only positive 64 bit
 541          * quantities are returned to userland we always strip off bit 63.
 542          * The hash code is designed such that codes 0x0000-0x7FFF are not
 543          * used, allowing us to use these codes for articial entries.
 544          *
 545          * Entry 0 is used for '.' and entry 1 is used for '..'.  Do not
 546          * allow '..' to cross the mount point into (e.g.) the super-root.
 547          */
 548         if (saveoff == 0) {
 549                 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK;
 550                 r = vop_write_dirent(&error, uio, inum, DT_DIR, 1, ".");
 551                 if (r)
 552                         goto done;
 553                 if (cookies)
 554                         cookies[cookie_index] = saveoff;
 555                 ++saveoff;
 556                 ++cookie_index;
 557                 if (cookie_index == ncookies)
 558                         goto done;
 559         }
 560
 561         if (saveoff == 1) {
 562                 /*
 563                  * Be careful with lockorder when accessing ".."
 564                  *
 565                  * (ip is the current dir. xip is the parent dir).
 566                  */
 567                 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK;
 568                 if (ip != ip->pmp->iroot)
 569                         inum = ip->meta.iparent & HAMMER2_DIRHASH_USERMSK;
 570                 r = vop_write_dirent(&error, uio, inum, DT_DIR, 2, "..");
 571                 if (r)
 572                         goto done;
 573                 if (cookies)
 574                         cookies[cookie_index] = saveoff;
 575                 ++saveoff;
 576                 ++cookie_index;
 577                 if (cookie_index == ncookies)
 578                         goto done;
 579         }
 580
 581         lkey = saveoff | HAMMER2_DIRHASH_VISIBLE;
 582         if (hammer2_debug & 0x0020)
 583                 kprintf("readdir: lkey %016jx\n", lkey);
 584         if (error)
 585                 goto done;
 586
 587         /*
 588          * Use XOP for cluster scan.
 589          *
 590          * parent is the inode cluster, already locked for us.  Don't
 591          * double lock shared locks as this will screw up upgrades.
 592          */
 593         xop = hammer2_xop_alloc(ip, 0);
 594         xop->lkey = lkey;
 595         hammer2_xop_start(&xop->head, hammer2_xop_readdir);
 596
 597         for (;;) {
 598                 const hammer2_inode_data_t *ripdata;
 599                 const char *dname;
 600                 int dtype;
 601
 602                 error = hammer2_xop_collect(&xop->head, 0);
 603                 if (error)
 604                         break;
 605                 if (cookie_index == ncookies)
 606                         break;
 607                 if (hammer2_debug & 0x0020)
 608                 kprintf("cluster chain %p %p\n",
 609                         xop->head.cluster.focus,
 610                         (xop->head.cluster.focus ?
 611                          xop->head.cluster.focus->data : (void *)-1));
 612                 hammer2_cluster_bref(&xop->head.cluster, &bref);
 613
 614                 if (bref.type == HAMMER2_BREF_TYPE_INODE) {
 615                         ripdata =
 616                             &hammer2_cluster_rdata(&xop->head.cluster)->ipdata;
 617                         dtype = hammer2_get_dtype(ripdata->meta.type);
 618                         saveoff = bref.key & HAMMER2_DIRHASH_USERMSK;
 619                         r = vop_write_dirent(&error, uio,
 620                                              ripdata->meta.inum &
 621                                               HAMMER2_DIRHASH_USERMSK,
 622                                              dtype,
 623                                              ripdata->meta.name_len,
 624                                              ripdata->filename);
 625                         if (r)
 626                                 break;
 627                         if (cookies)
 628                                 cookies[cookie_index] = saveoff;
 629                         ++cookie_index;
 630                 } else if (bref.type == HAMMER2_BREF_TYPE_DIRENT) {
 631                         dtype = hammer2_get_dtype(bref.embed.dirent.type);
 632                         saveoff = bref.key & HAMMER2_DIRHASH_USERMSK;
 633                         if (bref.embed.dirent.namlen <=
 634                             sizeof(bref.check.buf)) {
 635                                 dname = bref.check.buf;
 636                         } else {
 637                                 dname =
 638                                  hammer2_cluster_rdata(&xop->head.cluster)->buf;
 639                         }
 640                         r = vop_write_dirent(&error, uio,
 641                                              bref.embed.dirent.inum,
 642                                              dtype,
 643                                              bref.embed.dirent.namlen,
 644                                              dname);
 645                         if (r)
 646                                 break;
 647                         if (cookies)
 648                                 cookies[cookie_index] = saveoff;
 649                         ++cookie_index;
 650                 } else {
 651                         /* XXX chain error */
 652                         kprintf("bad chain type readdir %d\n", bref.type);
 653                 }
 654         }
 655         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
 656         if (error == ENOENT) {
 657                 error = 0;
 658                 eofflag = 1;
 659                 saveoff = (hammer2_key_t)-1;
 660         } else {
 661                 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK;
 662         }
 663 done:
 664         hammer2_inode_unlock(ip);
 665         if (ap->a_eofflag)
 666                 *ap->a_eofflag = eofflag;
 667         if (hammer2_debug & 0x0020)
 668                 kprintf("readdir: done at %016jx\n", saveoff);
 669         uio->uio_offset = saveoff & ~HAMMER2_DIRHASH_VISIBLE;
 670         if (error && cookie_index == 0) {
 671                 if (cookies) {
 672                         kfree(cookies, M_TEMP);
 673                         *ap->a_ncookies = 0;
 674                         *ap->a_cookies = NULL;
 675                 }
 676         } else {
 677                 if (cookies) {
 678                         *ap->a_ncookies = cookie_index;
 679                         *ap->a_cookies = cookies;
 680                 }
 681         }
 682         LOCKSTOP;
 683         return (error);
 684 }
 685
 686 /*
 687  * hammer2_vop_readlink { vp, uio, cred }
 688  */
 689 static
 690 int
 691 hammer2_vop_readlink(struct vop_readlink_args *ap)
 692 {
 693         struct vnode *vp;
 694         hammer2_inode_t *ip;
 695         int error;
 696
 697         vp = ap->a_vp;
 698         if (vp->v_type != VLNK)
 699                 return (EINVAL);
 700         ip = VTOI(vp);
 701
 702         error = hammer2_read_file(ip, ap->a_uio, 0);
 703         return (error);
 704 }
 705
 706 static
 707 int
 708 hammer2_vop_read(struct vop_read_args *ap)
 709 {
 710         struct vnode *vp;
 711         hammer2_inode_t *ip;
 712         struct uio *uio;
 713         int error;
 714         int seqcount;
 715         int bigread;
 716
 717         /*
 718          * Read operations supported on this vnode?
 719          */
 720         vp = ap->a_vp;
 721         if (vp->v_type != VREG)
 722                 return (EINVAL);
 723
 724         /*
 725          * Misc
 726          */
 727         ip = VTOI(vp);
 728         uio = ap->a_uio;
 729         error = 0;
 730
 731         seqcount = ap->a_ioflag >> 16;
 732         bigread = (uio->uio_resid > 100 * 1024 * 1024);
 733
 734         error = hammer2_read_file(ip, uio, seqcount);
 735         return (error);
 736 }
 737
 738 static
 739 int
 740 hammer2_vop_write(struct vop_write_args *ap)
 741 {
 742         hammer2_inode_t *ip;
 743         thread_t td;
 744         struct vnode *vp;
 745         struct uio *uio;
 746         int error;
 747         int seqcount;
 748
 749         /*
 750          * Read operations supported on this vnode?
 751          */
 752         vp = ap->a_vp;
 753         if (vp->v_type != VREG)
 754                 return (EINVAL);
 755
 756         /*
 757          * Misc
 758          */
 759         ip = VTOI(vp);
 760         uio = ap->a_uio;
 761         error = 0;
 762         if (ip->pmp->ronly) {
 763                 return (EROFS);
 764         }
 765
 766         seqcount = ap->a_ioflag >> 16;
 767
 768         /*
 769          * Check resource limit
 770          */
 771         if (uio->uio_resid > 0 && (td = uio->uio_td) != NULL && td->td_proc &&
 772             uio->uio_offset + uio->uio_resid >
 773              td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
 774                 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ);
 775                 return (EFBIG);
 776         }
 777
 778         /*
 779          * The transaction interlocks against flush initiations
 780          * (note: but will run concurrently with the actual flush).
 781          *
 782          * To avoid deadlocking against the VM system, we must flag any
 783          * transaction related to the buffer cache or other direct
 784          * VM page manipulation.
 785          */
 786         if (uio->uio_segflg == UIO_NOCOPY)
 787                 hammer2_trans_init(ip->pmp, HAMMER2_TRANS_BUFCACHE);
 788         else
 789                 hammer2_trans_init(ip->pmp, 0);
 790         error = hammer2_write_file(ip, uio, ap->a_ioflag, seqcount);
 791         hammer2_trans_done(ip->pmp);
 792
 793         return (error);
 794 }
 795
 796 /*
 797  * Perform read operations on a file or symlink given an UNLOCKED
 798  * inode and uio.
 799  *
 800  * The passed ip is not locked.
 801  */
 802 static
 803 int
 804 hammer2_read_file(hammer2_inode_t *ip, struct uio *uio, int seqcount)
 805 {
 806         hammer2_off_t size;
 807         struct buf *bp;
 808         int error;
 809
 810         error = 0;
 811
 812         /*
 813          * UIO read loop.
 814          *
 815          * WARNING! Assumes that the kernel interlocks size changes at the
 816          *          vnode level.
 817          */
 818         hammer2_mtx_sh(&ip->lock);
 819         hammer2_mtx_sh(&ip->truncate_lock);
 820         size = ip->meta.size;
 821         hammer2_mtx_unlock(&ip->lock);
 822
 823         while (uio->uio_resid > 0 && uio->uio_offset < size) {
 824                 hammer2_key_t lbase;
 825                 hammer2_key_t leof;
 826                 int lblksize;
 827                 int loff;
 828                 int n;
 829
 830                 lblksize = hammer2_calc_logical(ip, uio->uio_offset,
 831                                                 &lbase, &leof);
 832
 833 #if 1
 834                 error = cluster_read(ip->vp, leof, lbase, lblksize,
 835                                      uio->uio_resid, seqcount * MAXBSIZE,
 836                                      &bp);
 837 #else
 838                 if (uio->uio_segflg == UIO_NOCOPY) {
 839                         bp = getblk(ip->vp, lbase, lblksize, GETBLK_BHEAVY, 0);
 840                         if (bp->b_flags & B_CACHE) {
 841                                 int i;
 842                                 int j = 0;
 843                                 if (bp->b_xio.xio_npages != 16)
 844                                         kprintf("NPAGES BAD\n");
 845                                 for (i = 0; i < bp->b_xio.xio_npages; ++i) {
 846                                         vm_page_t m;
 847                                         m = bp->b_xio.xio_pages[i];
 848                                         if (m == NULL || m->valid == 0) {
 849                                                 kprintf("bp %016jx %016jx pg %d inv",
 850                                                         lbase, leof, i);
 851                                                 if (m)
 852                                                         kprintf("m->object %p/%p", m->object, ip->vp->v_object);
 853                                                 kprintf("\n");
 854                                                 j = 1;
 855                                         }
 856                                 }
 857                                 if (j)
 858                                         kprintf("b_flags %08x, b_error %d\n", bp->b_flags, bp->b_error);
 859                         }
 860                         bqrelse(bp);
 861                 }
 862                 error = bread(ip->vp, lbase, lblksize, &bp);
 863 #endif
 864                 if (error) {
 865                         brelse(bp);
 866                         break;
 867                 }
 868                 loff = (int)(uio->uio_offset - lbase);
 869                 n = lblksize - loff;
 870                 if (n > uio->uio_resid)
 871                         n = uio->uio_resid;
 872                 if (n > size - uio->uio_offset)
 873                         n = (int)(size - uio->uio_offset);
 874                 bp->b_flags |= B_AGE;
 875                 uiomovebp(bp, (char *)bp->b_data + loff, n, uio);
 876                 bqrelse(bp);
 877         }
 878         hammer2_mtx_unlock(&ip->truncate_lock);
 879
 880         return (error);
 881 }
 882
 883 /*
 884  * Write to the file represented by the inode via the logical buffer cache.
 885  * The inode may represent a regular file or a symlink.
 886  *
 887  * The inode must not be locked.
 888  */
 889 static
 890 int
 891 hammer2_write_file(hammer2_inode_t *ip, struct uio *uio,
 892                    int ioflag, int seqcount)
 893 {
 894         hammer2_key_t old_eof;
 895         hammer2_key_t new_eof;
 896         struct buf *bp;
 897         int kflags;
 898         int error;
 899         int modified;
 900
 901         /*
 902          * Setup if append
 903          *
 904          * WARNING! Assumes that the kernel interlocks size changes at the
 905          *          vnode level.
 906          */
 907         hammer2_mtx_ex(&ip->lock);
 908         hammer2_mtx_sh(&ip->truncate_lock);
 909         if (ioflag & IO_APPEND)
 910                 uio->uio_offset = ip->meta.size;
 911         old_eof = ip->meta.size;
 912
 913         /*
 914          * Extend the file if necessary.  If the write fails at some point
 915          * we will truncate it back down to cover as much as we were able
 916          * to write.
 917          *
 918          * Doing this now makes it easier to calculate buffer sizes in
 919          * the loop.
 920          */
 921         kflags = 0;
 922         error = 0;
 923         modified = 0;
 924
 925         if (uio->uio_offset + uio->uio_resid > old_eof) {
 926                 new_eof = uio->uio_offset + uio->uio_resid;
 927                 modified = 1;
 928                 hammer2_extend_file(ip, new_eof);
 929                 kflags |= NOTE_EXTEND;
 930         } else {
 931                 new_eof = old_eof;
 932         }
 933         hammer2_mtx_unlock(&ip->lock);
 934
 935         /*
 936          * UIO write loop
 937          */
 938         while (uio->uio_resid > 0) {
 939                 hammer2_key_t lbase;
 940                 int trivial;
 941                 int endofblk;
 942                 int lblksize;
 943                 int loff;
 944                 int n;
 945
 946                 /*
 947                  * Don't allow the buffer build to blow out the buffer
 948                  * cache.
 949                  */
 950                 if ((ioflag & IO_RECURSE) == 0)
 951                         bwillwrite(HAMMER2_PBUFSIZE);
 952
 953                 /*
 954                  * This nominally tells us how much we can cluster and
 955                  * what the logical buffer size needs to be.  Currently
 956                  * we don't try to cluster the write and just handle one
 957                  * block at a time.
 958                  */
 959                 lblksize = hammer2_calc_logical(ip, uio->uio_offset,
 960                                                 &lbase, NULL);
 961                 loff = (int)(uio->uio_offset - lbase);
 962
 963                 KKASSERT(lblksize <= 65536);
 964
 965                 /*
 966                  * Calculate bytes to copy this transfer and whether the
 967                  * copy completely covers the buffer or not.
 968                  */
 969                 trivial = 0;
 970                 n = lblksize - loff;
 971                 if (n > uio->uio_resid) {
 972                         n = uio->uio_resid;
 973                         if (loff == lbase && uio->uio_offset + n == new_eof)
 974                                 trivial = 1;
 975                         endofblk = 0;
 976                 } else {
 977                         if (loff == 0)
 978                                 trivial = 1;
 979                         endofblk = 1;
 980                 }
 981                 if (lbase >= new_eof)
 982                         trivial = 1;
 983
 984                 /*
 985                  * Get the buffer
 986                  */
 987                 if (uio->uio_segflg == UIO_NOCOPY) {
 988                         /*
 989                          * Issuing a write with the same data backing the
 990                          * buffer.  Instantiate the buffer to collect the
 991                          * backing vm pages, then read-in any missing bits.
 992                          *
 993                          * This case is used by vop_stdputpages().
 994                          */
 995                         bp = getblk(ip->vp, lbase, lblksize, GETBLK_BHEAVY, 0);
 996                         if ((bp->b_flags & B_CACHE) == 0) {
 997                                 bqrelse(bp);
 998                                 error = bread(ip->vp, lbase, lblksize, &bp);
 999                         }
1000                 } else if (trivial) {
1001                         /*
1002                          * Even though we are entirely overwriting the buffer
1003                          * we may still have to zero it out to avoid a
1004                          * mmap/write visibility issue.
1005                          */
1006                         bp = getblk(ip->vp, lbase, lblksize, GETBLK_BHEAVY, 0);
1007                         if ((bp->b_flags & B_CACHE) == 0)
1008                                 vfs_bio_clrbuf(bp);
1009                 } else {
1010                         /*
1011                          * Partial overwrite, read in any missing bits then
1012                          * replace the portion being written.
1013                          *
1014                          * (The strategy code will detect zero-fill physical
1015                          * blocks for this case).
1016                          */
1017                         error = bread(ip->vp, lbase, lblksize, &bp);
1018                         if (error == 0)
1019                                 bheavy(bp);
1020                 }
1021
1022                 if (error) {
1023                         brelse(bp);
1024                         break;
1025                 }
1026
1027                 /*
1028                  * Ok, copy the data in
1029                  */
1030                 error = uiomovebp(bp, bp->b_data + loff, n, uio);
1031                 kflags |= NOTE_WRITE;
1032                 modified = 1;
1033                 if (error) {
1034                         brelse(bp);
1035                         break;
1036                 }
1037
1038                 /*
1039                  * WARNING: Pageout daemon will issue UIO_NOCOPY writes
1040                  *          with IO_SYNC or IO_ASYNC set.  These writes
1041                  *          must be handled as the pageout daemon expects.
1042                  *
1043                  * NOTE!    H2 relies on cluster_write() here because it
1044                  *          cannot preallocate disk blocks at the logical
1045                  *          level due to not knowing what the compression
1046                  *          size will be at this time.
1047                  *
1048                  *          We must use cluster_write() here and we depend
1049                  *          on the write-behind feature to flush buffers
1050                  *          appropriately.  If we let the buffer daemons do
1051                  *          it the block allocations will be all over the
1052                  *          map.
1053                  */
1054                 if (ioflag & IO_SYNC) {
1055                         bwrite(bp);
1056                 } else if ((ioflag & IO_DIRECT) && endofblk) {
1057                         bawrite(bp);
1058                 } else if (ioflag & IO_ASYNC) {
1059                         bawrite(bp);
1060                 } else if (ip->vp->v_mount->mnt_flag & MNT_NOCLUSTERW) {
1061                         bdwrite(bp);
1062                 } else {
1063 #if 1
1064                         bp->b_flags |= B_CLUSTEROK;
1065                         cluster_write(bp, new_eof, lblksize, seqcount);
1066 #else
1067                         bp->b_flags |= B_CLUSTEROK;
1068                         bdwrite(bp);
1069 #endif
1070                 }
1071         }
1072
1073         /*
1074          * Cleanup.  If we extended the file EOF but failed to write through
1075          * the entire write is a failure and we have to back-up.
1076          */
1077         if (error && new_eof != old_eof) {
1078                 hammer2_mtx_unlock(&ip->truncate_lock);
1079                 hammer2_mtx_ex(&ip->lock);
1080                 hammer2_mtx_ex(&ip->truncate_lock);
1081                 hammer2_truncate_file(ip, old_eof);
1082                 if (ip->flags & HAMMER2_INODE_MODIFIED)
1083                         hammer2_inode_chain_sync(ip);
1084                 hammer2_mtx_unlock(&ip->lock);
1085         } else if (modified) {
1086                 hammer2_mtx_ex(&ip->lock);
1087                 hammer2_inode_modify(ip);
1088                 hammer2_update_time(&ip->meta.mtime);
1089                 if (ip->flags & HAMMER2_INODE_MODIFIED)
1090                         hammer2_inode_chain_sync(ip);
1091                 hammer2_mtx_unlock(&ip->lock);
1092                 hammer2_knote(ip->vp, kflags);
1093         }
1094         hammer2_trans_assert_strategy(ip->pmp);
1095         hammer2_mtx_unlock(&ip->truncate_lock);
1096
1097         return error;
1098 }
1099
1100 /*
1101  * Truncate the size of a file.  The inode must not be locked.
1102  *
1103  * We must unconditionally set HAMMER2_INODE_RESIZED to properly
1104  * ensure that any on-media data beyond the new file EOF has been destroyed.
1105  *
1106  * WARNING: nvtruncbuf() can only be safely called without the inode lock
1107  *          held due to the way our write thread works.  If the truncation
1108  *          occurs in the middle of a buffer, nvtruncbuf() is responsible
1109  *          for dirtying that buffer and zeroing out trailing bytes.
1110  *
1111  * WARNING! Assumes that the kernel interlocks size changes at the
1112  *          vnode level.
1113  *
1114  * WARNING! Caller assumes responsibility for removing dead blocks
1115  *          if INODE_RESIZED is set.
1116  */
1117 static
1118 void
1119 hammer2_truncate_file(hammer2_inode_t *ip, hammer2_key_t nsize)
1120 {
1121         hammer2_key_t lbase;
1122         int nblksize;
1123
1124         LOCKSTART;
1125         hammer2_mtx_unlock(&ip->lock);
1126         if (ip->vp) {
1127                 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL);
1128                 nvtruncbuf(ip->vp, nsize,
1129                            nblksize, (int)nsize & (nblksize - 1),
1130                            0);
1131         }
1132         hammer2_mtx_ex(&ip->lock);
1133         KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0);
1134         ip->osize = ip->meta.size;
1135         ip->meta.size = nsize;
1136         atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED);
1137         hammer2_inode_modify(ip);
1138         LOCKSTOP;
1139 }
1140
1141 /*
1142  * Extend the size of a file.  The inode must not be locked.
1143  *
1144  * Even though the file size is changing, we do not have to set the
1145  * INODE_RESIZED bit unless the file size crosses the EMBEDDED_BYTES
1146  * boundary.  When this occurs a hammer2_inode_chain_sync() is required
1147  * to prepare the inode cluster's indirect block table, otherwise
1148  * async execution of the strategy code will implode on us.
1149  *
1150  * WARNING! Assumes that the kernel interlocks size changes at the
1151  *          vnode level.
1152  *
1153  * WARNING! Caller assumes responsibility for transitioning out
1154  *          of the inode DIRECTDATA mode if INODE_RESIZED is set.
1155  */
1156 static
1157 void
1158 hammer2_extend_file(hammer2_inode_t *ip, hammer2_key_t nsize)
1159 {
1160         hammer2_key_t lbase;
1161         hammer2_key_t osize;
1162         int oblksize;
1163         int nblksize;
1164
1165         LOCKSTART;
1166
1167         KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0);
1168         hammer2_inode_modify(ip);
1169         osize = ip->meta.size;
1170         ip->osize = osize;
1171         ip->meta.size = nsize;
1172
1173         if (osize <= HAMMER2_EMBEDDED_BYTES && nsize > HAMMER2_EMBEDDED_BYTES) {
1174                 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED);
1175                 hammer2_inode_chain_sync(ip);
1176         }
1177
1178         hammer2_mtx_unlock(&ip->lock);
1179         if (ip->vp) {
1180                 oblksize = hammer2_calc_logical(ip, osize, &lbase, NULL);
1181                 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL);
1182                 nvextendbuf(ip->vp,
1183                             osize, nsize,
1184                             oblksize, nblksize,
1185                             -1, -1, 0);
1186         }
1187         hammer2_mtx_ex(&ip->lock);
1188
1189         LOCKSTOP;
1190 }
1191
1192 static
1193 int
1194 hammer2_vop_nresolve(struct vop_nresolve_args *ap)
1195 {
1196         hammer2_xop_nresolve_t *xop;
1197         hammer2_inode_t *ip;
1198         hammer2_inode_t *dip;
1199         struct namecache *ncp;
1200         struct vnode *vp;
1201         int error;
1202
1203         LOCKSTART;
1204         dip = VTOI(ap->a_dvp);
1205         xop = hammer2_xop_alloc(dip, 0);
1206
1207         ncp = ap->a_nch->ncp;
1208         hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen);
1209
1210         /*
1211          * Note: In DragonFly the kernel handles '.' and '..'.
1212          */
1213         hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1214         hammer2_xop_start(&xop->head, hammer2_xop_nresolve);
1215
1216         error = hammer2_xop_collect(&xop->head, 0);
1217         if (error) {
1218                 ip = NULL;
1219         } else {
1220                 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1);
1221         }
1222         hammer2_inode_unlock(dip);
1223
1224         /*
1225          * Acquire the related vnode
1226          *
1227          * NOTE: For error processing, only ENOENT resolves the namecache
1228          *       entry to NULL, otherwise we just return the error and
1229          *       leave the namecache unresolved.
1230          *
1231          * NOTE: multiple hammer2_inode structures can be aliased to the
1232          *       same chain element, for example for hardlinks.  This
1233          *       use case does not 'reattach' inode associations that
1234          *       might already exist, but always allocates a new one.
1235          *
1236          * WARNING: inode structure is locked exclusively via inode_get
1237          *          but chain was locked shared.  inode_unlock()
1238          *          will handle it properly.
1239          */
1240         if (ip) {
1241                 vp = hammer2_igetv(ip, &error);
1242                 if (error == 0) {
1243                         vn_unlock(vp);
1244                         cache_setvp(ap->a_nch, vp);
1245                 } else if (error == ENOENT) {
1246                         cache_setvp(ap->a_nch, NULL);
1247                 }
1248                 hammer2_inode_unlock(ip);
1249
1250                 /*
1251                  * The vp should not be released until after we've disposed
1252                  * of our locks, because it might cause vop_inactive() to
1253                  * be called.
1254                  */
1255                 if (vp)
1256                         vrele(vp);
1257         } else {
1258                 error = ENOENT;
1259                 cache_setvp(ap->a_nch, NULL);
1260         }
1261         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1262         KASSERT(error || ap->a_nch->ncp->nc_vp != NULL,
1263                 ("resolve error %d/%p ap %p\n",
1264                  error, ap->a_nch->ncp->nc_vp, ap));
1265         LOCKSTOP;
1266
1267         return error;
1268 }
1269
1270 static
1271 int
1272 hammer2_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
1273 {
1274         hammer2_inode_t *dip;
1275         hammer2_tid_t inum;
1276         int error;
1277
1278         LOCKSTART;
1279         dip = VTOI(ap->a_dvp);
1280         inum = dip->meta.iparent;
1281         *ap->a_vpp = NULL;
1282
1283         if (inum) {
1284                 error = hammer2_vfs_vget(ap->a_dvp->v_mount, NULL,
1285                                          inum, ap->a_vpp);
1286         } else {
1287                 error = ENOENT;
1288         }
1289         LOCKSTOP;
1290         return error;
1291 }
1292
1293 static
1294 int
1295 hammer2_vop_nmkdir(struct vop_nmkdir_args *ap)
1296 {
1297         hammer2_inode_t *dip;
1298         hammer2_inode_t *nip;
1299         struct namecache *ncp;
1300         const uint8_t *name;
1301         size_t name_len;
1302         hammer2_tid_t inum;
1303         int error;
1304
1305         LOCKSTART;
1306         dip = VTOI(ap->a_dvp);
1307         if (dip->pmp->ronly) {
1308                 LOCKSTOP;
1309                 return (EROFS);
1310         }
1311
1312         ncp = ap->a_nch->ncp;
1313         name = ncp->nc_name;
1314         name_len = ncp->nc_nlen;
1315
1316         hammer2_pfs_memory_wait(dip->pmp);
1317         hammer2_trans_init(dip->pmp, 0);
1318
1319         inum = hammer2_trans_newinum(dip->pmp);
1320
1321         /*
1322          * Create the actual inode as a hidden file in the iroot, then
1323          * create the directory entry.  The creation of the actual inode
1324          * sets its nlinks to 1 which is the value we desire.
1325          */
1326         nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred,
1327                                    NULL, 0, inum,
1328                                    inum, 0, 0,
1329                                    0, &error);
1330         if (error == 0) {
1331                 error = hammer2_dirent_create(dip, name, name_len,
1332                                               nip->meta.inum, nip->meta.type);
1333         }
1334
1335         if (error) {
1336                 KKASSERT(nip == NULL);
1337                 *ap->a_vpp = NULL;
1338         } else {
1339                 *ap->a_vpp = hammer2_igetv(nip, &error);
1340                 hammer2_inode_unlock(nip);
1341         }
1342
1343         /*
1344          * Update dip's mtime
1345          */
1346         if (error == 0) {
1347                 uint64_t mtime;
1348
1349                 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1350                 hammer2_update_time(&mtime);
1351                 hammer2_inode_modify(dip);
1352                 dip->meta.mtime = mtime;
1353                 hammer2_inode_unlock(dip);
1354         }
1355
1356         hammer2_trans_done(dip->pmp);
1357
1358         if (error == 0) {
1359                 cache_setunresolved(ap->a_nch);
1360                 cache_setvp(ap->a_nch, *ap->a_vpp);
1361         }
1362         LOCKSTOP;
1363         return error;
1364 }
1365
1366 static
1367 int
1368 hammer2_vop_open(struct vop_open_args *ap)
1369 {
1370         return vop_stdopen(ap);
1371 }
1372
1373 /*
1374  * hammer2_vop_advlock { vp, id, op, fl, flags }
1375  */
1376 static
1377 int
1378 hammer2_vop_advlock(struct vop_advlock_args *ap)
1379 {
1380         hammer2_inode_t *ip = VTOI(ap->a_vp);
1381         hammer2_off_t size;
1382
1383         size = ip->meta.size;
1384         return (lf_advlock(ap, &ip->advlock, size));
1385 }
1386
1387 static
1388 int
1389 hammer2_vop_close(struct vop_close_args *ap)
1390 {
1391         return vop_stdclose(ap);
1392 }
1393
1394 /*
1395  * hammer2_vop_nlink { nch, dvp, vp, cred }
1396  *
1397  * Create a hardlink from (vp) to {dvp, nch}.
1398  */
1399 static
1400 int
1401 hammer2_vop_nlink(struct vop_nlink_args *ap)
1402 {
1403         hammer2_inode_t *tdip;  /* target directory to create link in */
1404         hammer2_inode_t *ip;    /* inode we are hardlinking to */
1405         struct namecache *ncp;
1406         const uint8_t *name;
1407         size_t name_len;
1408         int error;
1409
1410         if (ap->a_dvp->v_mount != ap->a_vp->v_mount)
1411                 return(EXDEV);
1412
1413         LOCKSTART;
1414         tdip = VTOI(ap->a_dvp);
1415         if (tdip->pmp->ronly) {
1416                 LOCKSTOP;
1417                 return (EROFS);
1418         }
1419
1420         ncp = ap->a_nch->ncp;
1421         name = ncp->nc_name;
1422         name_len = ncp->nc_nlen;
1423
1424         /*
1425          * ip represents the file being hardlinked.  The file could be a
1426          * normal file or a hardlink target if it has already been hardlinked.
1427          * (with the new semantics, it will almost always be a hardlink
1428          * target).
1429          *
1430          * Bump nlinks and potentially also create or move the hardlink
1431          * target in the parent directory common to (ip) and (tdip).  The
1432          * consolidation code can modify ip->cluster.  The returned cluster
1433          * is locked.
1434          */
1435         ip = VTOI(ap->a_vp);
1436         KASSERT(ip->pmp, ("ip->pmp is NULL %p %p", ip, ip->pmp));
1437         hammer2_pfs_memory_wait(ip->pmp);
1438         hammer2_trans_init(ip->pmp, 0);
1439
1440         /*
1441          * Target should be an indexed inode or there's no way we will ever
1442          * be able to find it!
1443          */
1444         KKASSERT((ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE) == 0);
1445
1446         error = 0;
1447
1448         /*
1449          * Can return NULL and error == EXDEV if the common parent
1450          * crosses a directory with the xlink flag set.
1451          */
1452         hammer2_inode_lock(tdip, 0);
1453         hammer2_inode_lock(ip, 0);
1454
1455         /*
1456          * Create the directory entry and bump nlinks.
1457          */
1458         if (error == 0) {
1459                 error = hammer2_dirent_create(tdip, name, name_len,
1460                                               ip->meta.inum, ip->meta.type);
1461                 hammer2_inode_modify(ip);
1462                 ++ip->meta.nlinks;
1463         }
1464         if (error == 0) {
1465                 /*
1466                  * Update dip's mtime
1467                  */
1468                 uint64_t mtime;
1469
1470                 hammer2_update_time(&mtime);
1471                 hammer2_inode_modify(tdip);
1472                 tdip->meta.mtime = mtime;
1473
1474                 cache_setunresolved(ap->a_nch);
1475                 cache_setvp(ap->a_nch, ap->a_vp);
1476         }
1477         hammer2_inode_unlock(ip);
1478         hammer2_inode_unlock(tdip);
1479
1480         hammer2_trans_done(ip->pmp);
1481
1482         LOCKSTOP;
1483         return error;
1484 }
1485
1486 /*
1487  * hammer2_vop_ncreate { nch, dvp, vpp, cred, vap }
1488  *
1489  * The operating system has already ensured that the directory entry
1490  * does not exist and done all appropriate namespace locking.
1491  */
1492 static
1493 int
1494 hammer2_vop_ncreate(struct vop_ncreate_args *ap)
1495 {
1496         hammer2_inode_t *dip;
1497         hammer2_inode_t *nip;
1498         struct namecache *ncp;
1499         const uint8_t *name;
1500         size_t name_len;
1501         hammer2_tid_t inum;
1502         int error;
1503
1504         LOCKSTART;
1505         dip = VTOI(ap->a_dvp);
1506         if (dip->pmp->ronly) {
1507                 LOCKSTOP;
1508                 return (EROFS);
1509         }
1510
1511         ncp = ap->a_nch->ncp;
1512         name = ncp->nc_name;
1513         name_len = ncp->nc_nlen;
1514         hammer2_pfs_memory_wait(dip->pmp);
1515         hammer2_trans_init(dip->pmp, 0);
1516
1517         inum = hammer2_trans_newinum(dip->pmp);
1518
1519         /*
1520          * Create the actual inode as a hidden file in the iroot, then
1521          * create the directory entry.  The creation of the actual inode
1522          * sets its nlinks to 1 which is the value we desire.
1523          */
1524         nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred,
1525                                    NULL, 0, inum,
1526                                    inum, 0, 0,
1527                                    0, &error);
1528
1529         if (error == 0) {
1530                 error = hammer2_dirent_create(dip, name, name_len,
1531                                               nip->meta.inum, nip->meta.type);
1532         }
1533         if (error) {
1534                 KKASSERT(nip == NULL);
1535                 *ap->a_vpp = NULL;
1536         } else {
1537                 *ap->a_vpp = hammer2_igetv(nip, &error);
1538                 hammer2_inode_unlock(nip);
1539         }
1540
1541         /*
1542          * Update dip's mtime
1543          */
1544         if (error == 0) {
1545                 uint64_t mtime;
1546
1547                 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1548                 hammer2_update_time(&mtime);
1549                 hammer2_inode_modify(dip);
1550                 dip->meta.mtime = mtime;
1551                 hammer2_inode_unlock(dip);
1552         }
1553
1554         hammer2_trans_done(dip->pmp);
1555
1556         if (error == 0) {
1557                 cache_setunresolved(ap->a_nch);
1558                 cache_setvp(ap->a_nch, *ap->a_vpp);
1559         }
1560         LOCKSTOP;
1561         return error;
1562 }
1563
1564 /*
1565  * Make a device node (typically a fifo)
1566  */
1567 static
1568 int
1569 hammer2_vop_nmknod(struct vop_nmknod_args *ap)
1570 {
1571         hammer2_inode_t *dip;
1572         hammer2_inode_t *nip;
1573         struct namecache *ncp;
1574         const uint8_t *name;
1575         size_t name_len;
1576         hammer2_tid_t inum;
1577         int error;
1578
1579         LOCKSTART;
1580         dip = VTOI(ap->a_dvp);
1581         if (dip->pmp->ronly) {
1582                 LOCKSTOP;
1583                 return (EROFS);
1584         }
1585
1586         ncp = ap->a_nch->ncp;
1587         name = ncp->nc_name;
1588         name_len = ncp->nc_nlen;
1589         hammer2_pfs_memory_wait(dip->pmp);
1590         hammer2_trans_init(dip->pmp, 0);
1591
1592         /*
1593          * Create the device inode and then create the directory entry.
1594          */
1595         inum = hammer2_trans_newinum(dip->pmp);
1596         nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred,
1597                                    NULL, 0, inum,
1598                                    inum, 0, 0,
1599                                    0, &error);
1600         if (error == 0) {
1601                 error = hammer2_dirent_create(dip, name, name_len,
1602                                               nip->meta.inum, nip->meta.type);
1603         }
1604
1605
1606         if (error) {
1607                 KKASSERT(nip == NULL);
1608                 *ap->a_vpp = NULL;
1609         } else {
1610                 *ap->a_vpp = hammer2_igetv(nip, &error);
1611                 hammer2_inode_unlock(nip);
1612         }
1613
1614         /*
1615          * Update dip's mtime
1616          */
1617         if (error == 0) {
1618                 uint64_t mtime;
1619
1620                 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1621                 hammer2_update_time(&mtime);
1622                 hammer2_inode_modify(dip);
1623                 dip->meta.mtime = mtime;
1624                 hammer2_inode_unlock(dip);
1625         }
1626
1627         hammer2_trans_done(dip->pmp);
1628
1629         if (error == 0) {
1630                 cache_setunresolved(ap->a_nch);
1631                 cache_setvp(ap->a_nch, *ap->a_vpp);
1632         }
1633         LOCKSTOP;
1634         return error;
1635 }
1636
1637 /*
1638  * hammer2_vop_nsymlink { nch, dvp, vpp, cred, vap, target }
1639  */
1640 static
1641 int
1642 hammer2_vop_nsymlink(struct vop_nsymlink_args *ap)
1643 {
1644         hammer2_inode_t *dip;
1645         hammer2_inode_t *nip;
1646         struct namecache *ncp;
1647         const uint8_t *name;
1648         size_t name_len;
1649         hammer2_tid_t inum;
1650         int error;
1651
1652         dip = VTOI(ap->a_dvp);
1653         if (dip->pmp->ronly)
1654                 return (EROFS);
1655
1656         ncp = ap->a_nch->ncp;
1657         name = ncp->nc_name;
1658         name_len = ncp->nc_nlen;
1659         hammer2_pfs_memory_wait(dip->pmp);
1660         hammer2_trans_init(dip->pmp, 0);
1661
1662         ap->a_vap->va_type = VLNK;      /* enforce type */
1663
1664         /*
1665          * Create the softlink as an inode and then create the directory
1666          * entry.
1667          */
1668         inum = hammer2_trans_newinum(dip->pmp);
1669
1670         nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred,
1671                                    NULL, 0, inum,
1672                                    inum, 0, 0,
1673                                    0, &error);
1674         if (error == 0) {
1675                 error = hammer2_dirent_create(dip, name, name_len,
1676                                               nip->meta.inum, nip->meta.type);
1677         }
1678
1679
1680         if (error) {
1681                 KKASSERT(nip == NULL);
1682                 *ap->a_vpp = NULL;
1683                 hammer2_trans_done(dip->pmp);
1684                 return error;
1685         }
1686         *ap->a_vpp = hammer2_igetv(nip, &error);
1687
1688         /*
1689          * Build the softlink (~like file data) and finalize the namecache.
1690          */
1691         if (error == 0) {
1692                 size_t bytes;
1693                 struct uio auio;
1694                 struct iovec aiov;
1695
1696                 bytes = strlen(ap->a_target);
1697
1698                 hammer2_inode_unlock(nip);
1699                 bzero(&auio, sizeof(auio));
1700                 bzero(&aiov, sizeof(aiov));
1701                 auio.uio_iov = &aiov;
1702                 auio.uio_segflg = UIO_SYSSPACE;
1703                 auio.uio_rw = UIO_WRITE;
1704                 auio.uio_resid = bytes;
1705                 auio.uio_iovcnt = 1;
1706                 auio.uio_td = curthread;
1707                 aiov.iov_base = ap->a_target;
1708                 aiov.iov_len = bytes;
1709                 error = hammer2_write_file(nip, &auio, IO_APPEND, 0);
1710                 /* XXX handle error */
1711                 error = 0;
1712         } else {
1713                 hammer2_inode_unlock(nip);
1714         }
1715
1716         /*
1717          * Update dip's mtime
1718          */
1719         if (error == 0) {
1720                 uint64_t mtime;
1721
1722                 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1723                 hammer2_update_time(&mtime);
1724                 hammer2_inode_modify(dip);
1725                 dip->meta.mtime = mtime;
1726                 hammer2_inode_unlock(dip);
1727         }
1728
1729         hammer2_trans_done(dip->pmp);
1730
1731         /*
1732          * Finalize namecache
1733          */
1734         if (error == 0) {
1735                 cache_setunresolved(ap->a_nch);
1736                 cache_setvp(ap->a_nch, *ap->a_vpp);
1737                 /* hammer2_knote(ap->a_dvp, NOTE_WRITE); */
1738         }
1739         return error;
1740 }
1741
1742 /*
1743  * hammer2_vop_nremove { nch, dvp, cred }
1744  */
1745 static
1746 int
1747 hammer2_vop_nremove(struct vop_nremove_args *ap)
1748 {
1749         hammer2_xop_unlink_t *xop;
1750         hammer2_inode_t *dip;
1751         hammer2_inode_t *ip;
1752         struct namecache *ncp;
1753         int error;
1754         int isopen;
1755
1756         LOCKSTART;
1757         dip = VTOI(ap->a_dvp);
1758         if (dip->pmp->ronly) {
1759                 LOCKSTOP;
1760                 return(EROFS);
1761         }
1762
1763         ncp = ap->a_nch->ncp;
1764
1765         hammer2_pfs_memory_wait(dip->pmp);
1766         hammer2_trans_init(dip->pmp, 0);
1767         hammer2_inode_lock(dip, 0);
1768
1769         /*
1770          * The unlink XOP unlinks the path from the directory and
1771          * locates and returns the cluster associated with the real inode.
1772          * We have to handle nlinks here on the frontend.
1773          */
1774         xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING);
1775         hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen);
1776         isopen = cache_isopen(ap->a_nch);
1777         xop->isdir = 0;
1778         xop->dopermanent = 0;
1779         hammer2_xop_start(&xop->head, hammer2_xop_unlink);
1780
1781         /*
1782          * Collect the real inode and adjust nlinks, destroy the real
1783          * inode if nlinks transitions to 0 and it was the real inode
1784          * (else it has already been removed).
1785          */
1786         error = hammer2_xop_collect(&xop->head, 0);
1787         hammer2_inode_unlock(dip);
1788
1789         if (error == 0) {
1790                 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1);
1791                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1792                 if (ip) {
1793                         hammer2_inode_unlink_finisher(ip, isopen);
1794                         hammer2_inode_unlock(ip);
1795                 }
1796         } else {
1797                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1798         }
1799
1800         /*
1801          * Update dip's mtime
1802          */
1803         if (error == 0) {
1804                 uint64_t mtime;
1805
1806                 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1807                 hammer2_update_time(&mtime);
1808                 hammer2_inode_modify(dip);
1809                 dip->meta.mtime = mtime;
1810                 hammer2_inode_unlock(dip);
1811         }
1812
1813         hammer2_inode_run_sideq(dip->pmp);
1814         hammer2_trans_done(dip->pmp);
1815         if (error == 0)
1816                 cache_unlink(ap->a_nch);
1817         LOCKSTOP;
1818         return (error);
1819 }
1820
1821 /*
1822  * hammer2_vop_nrmdir { nch, dvp, cred }
1823  */
1824 static
1825 int
1826 hammer2_vop_nrmdir(struct vop_nrmdir_args *ap)
1827 {
1828         hammer2_xop_unlink_t *xop;
1829         hammer2_inode_t *dip;
1830         hammer2_inode_t *ip;
1831         struct namecache *ncp;
1832         int isopen;
1833         int error;
1834
1835         LOCKSTART;
1836         dip = VTOI(ap->a_dvp);
1837         if (dip->pmp->ronly) {
1838                 LOCKSTOP;
1839                 return(EROFS);
1840         }
1841
1842         hammer2_pfs_memory_wait(dip->pmp);
1843         hammer2_trans_init(dip->pmp, 0);
1844         hammer2_inode_lock(dip, 0);
1845
1846         xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING);
1847
1848         ncp = ap->a_nch->ncp;
1849         hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen);
1850         isopen = cache_isopen(ap->a_nch);
1851         xop->isdir = 1;
1852         xop->dopermanent = 0;
1853         hammer2_xop_start(&xop->head, hammer2_xop_unlink);
1854
1855         /*
1856          * Collect the real inode and adjust nlinks, destroy the real
1857          * inode if nlinks transitions to 0 and it was the real inode
1858          * (else it has already been removed).
1859          */
1860         error = hammer2_xop_collect(&xop->head, 0);
1861         hammer2_inode_unlock(dip);
1862
1863         if (error == 0) {
1864                 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1);
1865                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1866                 if (ip) {
1867                         hammer2_inode_unlink_finisher(ip, isopen);
1868                         hammer2_inode_unlock(ip);
1869                 }
1870         } else {
1871                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1872         }
1873
1874         /*
1875          * Update dip's mtime
1876          */
1877         if (error == 0) {
1878                 uint64_t mtime;
1879
1880                 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1881                 hammer2_update_time(&mtime);
1882                 hammer2_inode_modify(dip);
1883                 dip->meta.mtime = mtime;
1884                 hammer2_inode_unlock(dip);
1885         }
1886
1887         hammer2_inode_run_sideq(dip->pmp);
1888         hammer2_trans_done(dip->pmp);
1889         if (error == 0)
1890                 cache_unlink(ap->a_nch);
1891         LOCKSTOP;
1892         return (error);
1893 }
1894
1895 /*
1896  * hammer2_vop_nrename { fnch, tnch, fdvp, tdvp, cred }
1897  */
1898 static
1899 int
1900 hammer2_vop_nrename(struct vop_nrename_args *ap)
1901 {
1902         struct namecache *fncp;
1903         struct namecache *tncp;
1904         hammer2_inode_t *fdip;
1905         hammer2_inode_t *tdip;
1906         hammer2_inode_t *ip;
1907         const uint8_t *fname;
1908         size_t fname_len;
1909         const uint8_t *tname;
1910         size_t tname_len;
1911         int error;
1912         int tnch_error;
1913         int update_tdip;
1914         int update_fdip;
1915         hammer2_key_t tlhc;
1916
1917         if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount)
1918                 return(EXDEV);
1919         if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount)
1920                 return(EXDEV);
1921
1922         fdip = VTOI(ap->a_fdvp);        /* source directory */
1923         tdip = VTOI(ap->a_tdvp);        /* target directory */
1924
1925         if (fdip->pmp->ronly)
1926                 return(EROFS);
1927
1928         LOCKSTART;
1929         fncp = ap->a_fnch->ncp;         /* entry name in source */
1930         fname = fncp->nc_name;
1931         fname_len = fncp->nc_nlen;
1932
1933         tncp = ap->a_tnch->ncp;         /* entry name in target */
1934         tname = tncp->nc_name;
1935         tname_len = tncp->nc_nlen;
1936
1937         hammer2_pfs_memory_wait(tdip->pmp);
1938         hammer2_trans_init(tdip->pmp, 0);
1939
1940         update_tdip = 0;
1941         update_fdip = 0;
1942
1943         /*
1944          * ip is the inode being renamed.  If this is a hardlink then
1945          * ip represents the actual file and not the hardlink marker.
1946          */
1947         ip = VTOI(fncp->nc_vp);
1948
1949         KKASSERT((ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE) == 0);
1950
1951         /*
1952          * Can return NULL and error == EXDEV if the common parent
1953          * crosses a directory with the xlink flag set.
1954          */
1955         error = 0;
1956         hammer2_inode_lock(fdip, 0);
1957         hammer2_inode_lock(tdip, 0);
1958         hammer2_inode_ref(ip);          /* extra ref */
1959
1960         hammer2_inode_lock(ip, 0);
1961
1962         /*
1963          * Delete the target namespace.
1964          */
1965         {
1966                 hammer2_xop_unlink_t *xop2;
1967                 hammer2_inode_t *tip;
1968                 int isopen;
1969
1970                 /*
1971                  * The unlink XOP unlinks the path from the directory and
1972                  * locates and returns the cluster associated with the real
1973                  * inode.  We have to handle nlinks here on the frontend.
1974                  */
1975                 xop2 = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING);
1976                 hammer2_xop_setname(&xop2->head, tname, tname_len);
1977                 isopen = cache_isopen(ap->a_tnch);
1978                 xop2->isdir = -1;
1979                 xop2->dopermanent = 0;
1980                 hammer2_xop_start(&xop2->head, hammer2_xop_unlink);
1981
1982                 /*
1983                  * Collect the real inode and adjust nlinks, destroy the real
1984                  * inode if nlinks transitions to 0 and it was the real inode
1985                  * (else it has already been removed).
1986                  */
1987                 tnch_error = hammer2_xop_collect(&xop2->head, 0);
1988                 /* hammer2_inode_unlock(tdip); */
1989
1990                 if (tnch_error == 0) {
1991                         tip = hammer2_inode_get(tdip->pmp, NULL,
1992                                                 &xop2->head.cluster, -1);
1993                         hammer2_xop_retire(&xop2->head, HAMMER2_XOPMASK_VOP);
1994                         if (tip) {
1995                                 hammer2_inode_unlink_finisher(tip, isopen);
1996                                 hammer2_inode_unlock(tip);
1997                         }
1998                 } else {
1999                         hammer2_xop_retire(&xop2->head, HAMMER2_XOPMASK_VOP);
2000                 }
2001                 /* hammer2_inode_lock(tdip, 0); */
2002
2003                 if (tnch_error && tnch_error != ENOENT) {
2004                         error = tnch_error;
2005                         goto done2;
2006                 }
2007                 update_tdip = 1;
2008         }
2009
2010         /*
2011          * Resolve the collision space for (tdip, tname, tname_len)
2012          *
2013          * tdip must be held exclusively locked to prevent races.
2014          */
2015         {
2016                 hammer2_xop_scanlhc_t *sxop;
2017                 hammer2_tid_t lhcbase;
2018
2019                 tlhc = hammer2_dirhash(tname, tname_len);
2020                 lhcbase = tlhc;
2021                 sxop = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING);
2022                 sxop->lhc = tlhc;
2023                 hammer2_xop_start(&sxop->head, hammer2_xop_scanlhc);
2024                 while ((error = hammer2_xop_collect(&sxop->head, 0)) == 0) {
2025                         if (tlhc != sxop->head.cluster.focus->bref.key)
2026                                 break;
2027                         ++tlhc;
2028                 }
2029                 hammer2_xop_retire(&sxop->head, HAMMER2_XOPMASK_VOP);
2030
2031                 if (error) {
2032                         if (error != ENOENT)
2033                                 goto done2;
2034                         ++tlhc;
2035                         error = 0;
2036                 }
2037                 if ((lhcbase ^ tlhc) & ~HAMMER2_DIRHASH_LOMASK) {
2038                         error = ENOSPC;
2039                         goto done2;
2040                 }
2041         }
2042
2043         /*
2044          * Everything is setup, do the rename.
2045          *
2046          * We have to synchronize ip->meta to the underlying operation.
2047          *
2048          * NOTE: To avoid deadlocks we cannot lock (ip) while we are
2049          *       unlinking elements from their directories.  Locking
2050          *       the nlinks field does not lock the whole inode.
2051          */
2052         /* hammer2_inode_lock(ip, 0); */
2053         if (error == 0) {
2054                 hammer2_xop_nrename_t *xop4;
2055
2056                 xop4 = hammer2_xop_alloc(fdip, HAMMER2_XOP_MODIFYING);
2057                 xop4->lhc = tlhc;
2058                 xop4->ip_key = ip->meta.name_key;
2059                 hammer2_xop_setip2(&xop4->head, ip);
2060                 hammer2_xop_setip3(&xop4->head, tdip);
2061                 hammer2_xop_setname(&xop4->head, fname, fname_len);
2062                 hammer2_xop_setname2(&xop4->head, tname, tname_len);
2063                 hammer2_xop_start(&xop4->head, hammer2_xop_nrename);
2064
2065                 error = hammer2_xop_collect(&xop4->head, 0);
2066                 hammer2_xop_retire(&xop4->head, HAMMER2_XOPMASK_VOP);
2067
2068                 if (error == ENOENT)
2069                         error = 0;
2070                 if (error == 0 &&
2071                     (ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE)) {
2072                         hammer2_inode_modify(ip);
2073                         ip->meta.name_len = tname_len;
2074                         ip->meta.name_key = tlhc;
2075
2076                 }
2077                 update_fdip = 1;
2078                 update_fdip = 1;
2079         }
2080
2081 done2:
2082         /*
2083          * Update directory mtimes to represent the something changed.
2084          */
2085         if (update_fdip || update_tdip) {
2086                 uint64_t mtime;
2087
2088                 hammer2_update_time(&mtime);
2089                 if (update_fdip) {
2090                         hammer2_inode_modify(fdip);
2091                         fdip->meta.mtime = mtime;
2092                 }
2093                 if (update_tdip) {
2094                         hammer2_inode_modify(tdip);
2095                         tdip->meta.mtime = mtime;
2096                 }
2097         }
2098         hammer2_inode_unlock(ip);
2099         hammer2_inode_unlock(tdip);
2100         hammer2_inode_unlock(fdip);
2101         hammer2_inode_drop(ip);
2102         hammer2_inode_run_sideq(fdip->pmp);
2103
2104         hammer2_trans_done(tdip->pmp);
2105
2106         /*
2107          * Issue the namecache update after unlocking all the internal
2108          * hammer structures, otherwise we might deadlock.
2109          */
2110         if (tnch_error == 0) {
2111                 cache_unlink(ap->a_tnch);
2112                 cache_setunresolved(ap->a_tnch);
2113         }
2114         if (error == 0)
2115                 cache_rename(ap->a_fnch, ap->a_tnch);
2116
2117         LOCKSTOP;
2118         return (error);
2119 }
2120
2121 /*
2122  * hammer2_vop_ioctl { vp, command, data, fflag, cred }
2123  */
2124 static
2125 int
2126 hammer2_vop_ioctl(struct vop_ioctl_args *ap)
2127 {
2128         hammer2_inode_t *ip;
2129         int error;
2130
2131         LOCKSTART;
2132         ip = VTOI(ap->a_vp);
2133
2134         error = hammer2_ioctl(ip, ap->a_command, (void *)ap->a_data,
2135                               ap->a_fflag, ap->a_cred);
2136         LOCKSTOP;
2137         return (error);
2138 }
2139
2140 static
2141 int
2142 hammer2_vop_mountctl(struct vop_mountctl_args *ap)
2143 {
2144         struct mount *mp;
2145         hammer2_pfs_t *pmp;
2146         int rc;
2147
2148         LOCKSTART;
2149         switch (ap->a_op) {
2150         case (MOUNTCTL_SET_EXPORT):
2151                 mp = ap->a_head.a_ops->head.vv_mount;
2152                 pmp = MPTOPMP(mp);
2153
2154                 if (ap->a_ctllen != sizeof(struct export_args))
2155                         rc = (EINVAL);
2156                 else
2157                         rc = vfs_export(mp, &pmp->export,
2158                                         (const struct export_args *)ap->a_ctl);
2159                 break;
2160         default:
2161                 rc = vop_stdmountctl(ap);
2162                 break;
2163         }
2164         LOCKSTOP;
2165         return (rc);
2166 }
2167
2168 /*
2169  * KQFILTER
2170  */
2171 static void filt_hammer2detach(struct knote *kn);
2172 static int filt_hammer2read(struct knote *kn, long hint);
2173 static int filt_hammer2write(struct knote *kn, long hint);
2174 static int filt_hammer2vnode(struct knote *kn, long hint);
2175
2176 static struct filterops hammer2read_filtops =
2177         { FILTEROP_ISFD | FILTEROP_MPSAFE,
2178           NULL, filt_hammer2detach, filt_hammer2read };
2179 static struct filterops hammer2write_filtops =
2180         { FILTEROP_ISFD | FILTEROP_MPSAFE,
2181           NULL, filt_hammer2detach, filt_hammer2write };
2182 static struct filterops hammer2vnode_filtops =
2183         { FILTEROP_ISFD | FILTEROP_MPSAFE,
2184           NULL, filt_hammer2detach, filt_hammer2vnode };
2185
2186 static
2187 int
2188 hammer2_vop_kqfilter(struct vop_kqfilter_args *ap)
2189 {
2190         struct vnode *vp = ap->a_vp;
2191         struct knote *kn = ap->a_kn;
2192
2193         switch (kn->kn_filter) {
2194         case EVFILT_READ:
2195                 kn->kn_fop = &hammer2read_filtops;
2196                 break;
2197         case EVFILT_WRITE:
2198                 kn->kn_fop = &hammer2write_filtops;
2199                 break;
2200         case EVFILT_VNODE:
2201                 kn->kn_fop = &hammer2vnode_filtops;
2202                 break;
2203         default:
2204                 return (EOPNOTSUPP);
2205         }
2206
2207         kn->kn_hook = (caddr_t)vp;
2208
2209         knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
2210
2211         return(0);
2212 }
2213
2214 static void
2215 filt_hammer2detach(struct knote *kn)
2216 {
2217         struct vnode *vp = (void *)kn->kn_hook;
2218
2219         knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
2220 }
2221
2222 static int
2223 filt_hammer2read(struct knote *kn, long hint)
2224 {
2225         struct vnode *vp = (void *)kn->kn_hook;
2226         hammer2_inode_t *ip = VTOI(vp);
2227         off_t off;
2228
2229         if (hint == NOTE_REVOKE) {
2230                 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT);
2231                 return(1);
2232         }
2233         off = ip->meta.size - kn->kn_fp->f_offset;
2234         kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX;
2235         if (kn->kn_sfflags & NOTE_OLDAPI)
2236                 return(1);
2237         return (kn->kn_data != 0);
2238 }
2239
2240
2241 static int
2242 filt_hammer2write(struct knote *kn, long hint)
2243 {
2244         if (hint == NOTE_REVOKE)
2245                 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT);
2246         kn->kn_data = 0;
2247         return (1);
2248 }
2249
2250 static int
2251 filt_hammer2vnode(struct knote *kn, long hint)
2252 {
2253         if (kn->kn_sfflags & hint)
2254                 kn->kn_fflags |= hint;
2255         if (hint == NOTE_REVOKE) {
2256                 kn->kn_flags |= (EV_EOF | EV_NODATA);
2257                 return (1);
2258         }
2259         return (kn->kn_fflags != 0);
2260 }
2261
2262 /*
2263  * FIFO VOPS
2264  */
2265 static
2266 int
2267 hammer2_vop_markatime(struct vop_markatime_args *ap)
2268 {
2269         hammer2_inode_t *ip;
2270         struct vnode *vp;
2271
2272         vp = ap->a_vp;
2273         ip = VTOI(vp);
2274
2275         if (ip->pmp->ronly)
2276                 return(EROFS);
2277         return(0);
2278 }
2279
2280 static
2281 int
2282 hammer2_vop_fifokqfilter(struct vop_kqfilter_args *ap)
2283 {
2284         int error;
2285
2286         error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2287         if (error)
2288                 error = hammer2_vop_kqfilter(ap);
2289         return(error);
2290 }
2291
2292 /*
2293  * VOPS vector
2294  */
2295 struct vop_ops hammer2_vnode_vops = {
2296         .vop_default    = vop_defaultop,
2297         .vop_fsync      = hammer2_vop_fsync,
2298         .vop_getpages   = vop_stdgetpages,
2299         .vop_putpages   = vop_stdputpages,
2300         .vop_access     = hammer2_vop_access,
2301         .vop_advlock    = hammer2_vop_advlock,
2302         .vop_close      = hammer2_vop_close,
2303         .vop_nlink      = hammer2_vop_nlink,
2304         .vop_ncreate    = hammer2_vop_ncreate,
2305         .vop_nsymlink   = hammer2_vop_nsymlink,
2306         .vop_nremove    = hammer2_vop_nremove,
2307         .vop_nrmdir     = hammer2_vop_nrmdir,
2308         .vop_nrename    = hammer2_vop_nrename,
2309         .vop_getattr    = hammer2_vop_getattr,
2310         .vop_setattr    = hammer2_vop_setattr,
2311         .vop_readdir    = hammer2_vop_readdir,
2312         .vop_readlink   = hammer2_vop_readlink,
2313         .vop_getpages   = vop_stdgetpages,
2314         .vop_putpages   = vop_stdputpages,
2315         .vop_read       = hammer2_vop_read,
2316         .vop_write      = hammer2_vop_write,
2317         .vop_open       = hammer2_vop_open,
2318         .vop_inactive   = hammer2_vop_inactive,
2319         .vop_reclaim    = hammer2_vop_reclaim,
2320         .vop_nresolve   = hammer2_vop_nresolve,
2321         .vop_nlookupdotdot = hammer2_vop_nlookupdotdot,
2322         .vop_nmkdir     = hammer2_vop_nmkdir,
2323         .vop_nmknod     = hammer2_vop_nmknod,
2324         .vop_ioctl      = hammer2_vop_ioctl,
2325         .vop_mountctl   = hammer2_vop_mountctl,
2326         .vop_bmap       = hammer2_vop_bmap,
2327         .vop_strategy   = hammer2_vop_strategy,
2328         .vop_kqfilter   = hammer2_vop_kqfilter
2329 };
2330
2331 struct vop_ops hammer2_spec_vops = {
2332         .vop_default =          vop_defaultop,
2333         .vop_fsync =            hammer2_vop_fsync,
2334         .vop_read =             vop_stdnoread,
2335         .vop_write =            vop_stdnowrite,
2336         .vop_access =           hammer2_vop_access,
2337         .vop_close =            hammer2_vop_close,
2338         .vop_markatime =        hammer2_vop_markatime,
2339         .vop_getattr =          hammer2_vop_getattr,
2340         .vop_inactive =         hammer2_vop_inactive,
2341         .vop_reclaim =          hammer2_vop_reclaim,
2342         .vop_setattr =          hammer2_vop_setattr
2343 };
2344
2345 struct vop_ops hammer2_fifo_vops = {
2346         .vop_default =          fifo_vnoperate,
2347         .vop_fsync =            hammer2_vop_fsync,
2348 #if 0
2349         .vop_read =             hammer2_vop_fiforead,
2350         .vop_write =            hammer2_vop_fifowrite,
2351 #endif
2352         .vop_access =           hammer2_vop_access,
2353 #if 0
2354         .vop_close =            hammer2_vop_fifoclose,
2355 #endif
2356         .vop_markatime =        hammer2_vop_markatime,
2357         .vop_getattr =          hammer2_vop_getattr,
2358         .vop_inactive =         hammer2_vop_inactive,
2359         .vop_reclaim =          hammer2_vop_reclaim,
2360         .vop_setattr =          hammer2_vop_setattr,
2361         .vop_kqfilter =         hammer2_vop_fifokqfilter
2362 };
2363