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 < chain->bref.data_count)
 322                                         vap->va_bytes = chain->bref.data_count;
 323                         }
 324                 }
 325         }
 326         vap->va_type = hammer2_get_vtype(ip->meta.type);
 327         vap->va_filerev = 0;
 328         vap->va_uid_uuid = ip->meta.uid;
 329         vap->va_gid_uuid = ip->meta.gid;
 330         vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID |
 331                           VA_FSID_UUID_VALID;
 332
 333         hammer2_inode_unlock(ip);
 334
 335         LOCKSTOP;
 336         return (0);
 337 }
 338
 339 static
 340 int
 341 hammer2_vop_setattr(struct vop_setattr_args *ap)
 342 {
 343         hammer2_inode_t *ip;
 344         struct vnode *vp;
 345         struct vattr *vap;
 346         int error;
 347         int kflags = 0;
 348         uint64_t ctime;
 349
 350         LOCKSTART;
 351         vp = ap->a_vp;
 352         vap = ap->a_vap;
 353         hammer2_update_time(&ctime);
 354
 355         ip = VTOI(vp);
 356
 357         if (ip->pmp->ronly) {
 358                 LOCKSTOP;
 359                 return(EROFS);
 360         }
 361
 362         hammer2_pfs_memory_wait(ip->pmp);
 363         hammer2_trans_init(ip->pmp, 0);
 364         hammer2_inode_lock(ip, 0);
 365         error = 0;
 366
 367         if (vap->va_flags != VNOVAL) {
 368                 uint32_t flags;
 369
 370                 flags = ip->meta.uflags;
 371                 error = vop_helper_setattr_flags(&flags, vap->va_flags,
 372                                      hammer2_to_unix_xid(&ip->meta.uid),
 373                                      ap->a_cred);
 374                 if (error == 0) {
 375                         if (ip->meta.uflags != flags) {
 376                                 hammer2_inode_modify(ip);
 377                                 ip->meta.uflags = flags;
 378                                 ip->meta.ctime = ctime;
 379                                 kflags |= NOTE_ATTRIB;
 380                         }
 381                         if (ip->meta.uflags & (IMMUTABLE | APPEND)) {
 382                                 error = 0;
 383                                 goto done;
 384                         }
 385                 }
 386                 goto done;
 387         }
 388         if (ip->meta.uflags & (IMMUTABLE | APPEND)) {
 389                 error = EPERM;
 390                 goto done;
 391         }
 392         if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
 393                 mode_t cur_mode = ip->meta.mode;
 394                 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid);
 395                 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid);
 396                 uuid_t uuid_uid;
 397                 uuid_t uuid_gid;
 398
 399                 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid,
 400                                          ap->a_cred,
 401                                          &cur_uid, &cur_gid, &cur_mode);
 402                 if (error == 0) {
 403                         hammer2_guid_to_uuid(&uuid_uid, cur_uid);
 404                         hammer2_guid_to_uuid(&uuid_gid, cur_gid);
 405                         if (bcmp(&uuid_uid, &ip->meta.uid, sizeof(uuid_uid)) ||
 406                             bcmp(&uuid_gid, &ip->meta.gid, sizeof(uuid_gid)) ||
 407                             ip->meta.mode != cur_mode
 408                         ) {
 409                                 hammer2_inode_modify(ip);
 410                                 ip->meta.uid = uuid_uid;
 411                                 ip->meta.gid = uuid_gid;
 412                                 ip->meta.mode = cur_mode;
 413                                 ip->meta.ctime = ctime;
 414                         }
 415                         kflags |= NOTE_ATTRIB;
 416                 }
 417         }
 418
 419         /*
 420          * Resize the file
 421          */
 422         if (vap->va_size != VNOVAL && ip->meta.size != vap->va_size) {
 423                 switch(vp->v_type) {
 424                 case VREG:
 425                         if (vap->va_size == ip->meta.size)
 426                                 break;
 427                         if (vap->va_size < ip->meta.size) {
 428                                 hammer2_mtx_ex(&ip->truncate_lock);
 429                                 hammer2_truncate_file(ip, vap->va_size);
 430                                 hammer2_mtx_unlock(&ip->truncate_lock);
 431                         } else {
 432                                 hammer2_extend_file(ip, vap->va_size);
 433                         }
 434                         hammer2_inode_modify(ip);
 435                         ip->meta.mtime = ctime;
 436                         break;
 437                 default:
 438                         error = EINVAL;
 439                         goto done;
 440                 }
 441         }
 442 #if 0
 443         /* atime not supported */
 444         if (vap->va_atime.tv_sec != VNOVAL) {
 445                 hammer2_inode_modify(ip);
 446                 ip->meta.atime = hammer2_timespec_to_time(&vap->va_atime);
 447                 kflags |= NOTE_ATTRIB;
 448         }
 449 #endif
 450         if (vap->va_mode != (mode_t)VNOVAL) {
 451                 mode_t cur_mode = ip->meta.mode;
 452                 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid);
 453                 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid);
 454
 455                 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred,
 456                                          cur_uid, cur_gid, &cur_mode);
 457                 if (error == 0 && ip->meta.mode != cur_mode) {
 458                         hammer2_inode_modify(ip);
 459                         ip->meta.mode = cur_mode;
 460                         ip->meta.ctime = ctime;
 461                         kflags |= NOTE_ATTRIB;
 462                 }
 463         }
 464
 465         if (vap->va_mtime.tv_sec != VNOVAL) {
 466                 hammer2_inode_modify(ip);
 467                 ip->meta.mtime = hammer2_timespec_to_time(&vap->va_mtime);
 468                 kflags |= NOTE_ATTRIB;
 469         }
 470
 471 done:
 472         /*
 473          * If a truncation occurred we must call inode_fsync() now in order
 474          * to trim the related data chains, otherwise a later expansion can
 475          * cause havoc.
 476          *
 477          * If an extend occured that changed the DIRECTDATA state, we must
 478          * call inode_fsync now in order to prepare the inode's indirect
 479          * block table.
 480          */
 481         if (ip->flags & HAMMER2_INODE_RESIZED)
 482                 hammer2_inode_chain_sync(ip);
 483
 484         /*
 485          * Cleanup.
 486          */
 487         hammer2_inode_unlock(ip);
 488         hammer2_trans_done(ip->pmp);
 489         hammer2_knote(ip->vp, kflags);
 490
 491         LOCKSTOP;
 492         return (error);
 493 }
 494
 495 static
 496 int
 497 hammer2_vop_readdir(struct vop_readdir_args *ap)
 498 {
 499         hammer2_xop_readdir_t *xop;
 500         hammer2_blockref_t bref;
 501         hammer2_inode_t *ip;
 502         hammer2_tid_t inum;
 503         hammer2_key_t lkey;
 504         struct uio *uio;
 505         off_t *cookies;
 506         off_t saveoff;
 507         int cookie_index;
 508         int ncookies;
 509         int error;
 510         int eofflag;
 511         int dtype;
 512         int r;
 513
 514         LOCKSTART;
 515         ip = VTOI(ap->a_vp);
 516         uio = ap->a_uio;
 517         saveoff = uio->uio_offset;
 518         eofflag = 0;
 519         error = 0;
 520
 521         /*
 522          * Setup cookies directory entry cookies if requested
 523          */
 524         if (ap->a_ncookies) {
 525                 ncookies = uio->uio_resid / 16 + 1;
 526                 if (ncookies > 1024)
 527                         ncookies = 1024;
 528                 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
 529         } else {
 530                 ncookies = -1;
 531                 cookies = NULL;
 532         }
 533         cookie_index = 0;
 534
 535         hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
 536
 537         /*
 538          * Handle artificial entries.  To ensure that only positive 64 bit
 539          * quantities are returned to userland we always strip off bit 63.
 540          * The hash code is designed such that codes 0x0000-0x7FFF are not
 541          * used, allowing us to use these codes for articial entries.
 542          *
 543          * Entry 0 is used for '.' and entry 1 is used for '..'.  Do not
 544          * allow '..' to cross the mount point into (e.g.) the super-root.
 545          */
 546         if (saveoff == 0) {
 547                 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK;
 548                 r = vop_write_dirent(&error, uio, inum, DT_DIR, 1, ".");
 549                 if (r)
 550                         goto done;
 551                 if (cookies)
 552                         cookies[cookie_index] = saveoff;
 553                 ++saveoff;
 554                 ++cookie_index;
 555                 if (cookie_index == ncookies)
 556                         goto done;
 557         }
 558
 559         if (saveoff == 1) {
 560                 /*
 561                  * Be careful with lockorder when accessing ".."
 562                  *
 563                  * (ip is the current dir. xip is the parent dir).
 564                  */
 565                 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK;
 566                 if (ip != ip->pmp->iroot)
 567                         inum = ip->meta.iparent & HAMMER2_DIRHASH_USERMSK;
 568                 r = vop_write_dirent(&error, uio, inum, DT_DIR, 2, "..");
 569                 if (r)
 570                         goto done;
 571                 if (cookies)
 572                         cookies[cookie_index] = saveoff;
 573                 ++saveoff;
 574                 ++cookie_index;
 575                 if (cookie_index == ncookies)
 576                         goto done;
 577         }
 578
 579         lkey = saveoff | HAMMER2_DIRHASH_VISIBLE;
 580         if (hammer2_debug & 0x0020)
 581                 kprintf("readdir: lkey %016jx\n", lkey);
 582         if (error)
 583                 goto done;
 584
 585         /*
 586          * Use XOP for cluster scan.
 587          *
 588          * parent is the inode cluster, already locked for us.  Don't
 589          * double lock shared locks as this will screw up upgrades.
 590          */
 591         xop = hammer2_xop_alloc(ip, 0);
 592         xop->lkey = lkey;
 593         hammer2_xop_start(&xop->head, hammer2_xop_readdir);
 594
 595         for (;;) {
 596                 const hammer2_inode_data_t *ripdata;
 597
 598                 error = hammer2_xop_collect(&xop->head, 0);
 599                 if (error)
 600                         break;
 601                 if (cookie_index == ncookies)
 602                         break;
 603                 if (hammer2_debug & 0x0020)
 604                 kprintf("cluster chain %p %p\n",
 605                         xop->head.cluster.focus,
 606                         (xop->head.cluster.focus ?
 607                          xop->head.cluster.focus->data : (void *)-1));
 608                 ripdata = &hammer2_cluster_rdata(&xop->head.cluster)->ipdata;
 609                 hammer2_cluster_bref(&xop->head.cluster, &bref);
 610                 if (bref.type == HAMMER2_BREF_TYPE_INODE) {
 611                         dtype = hammer2_get_dtype(ripdata);
 612                         saveoff = bref.key & HAMMER2_DIRHASH_USERMSK;
 613                         r = vop_write_dirent(&error, uio,
 614                                              ripdata->meta.inum &
 615                                               HAMMER2_DIRHASH_USERMSK,
 616                                              dtype,
 617                                              ripdata->meta.name_len,
 618                                              ripdata->filename);
 619                         if (r)
 620                                 break;
 621                         if (cookies)
 622                                 cookies[cookie_index] = saveoff;
 623                         ++cookie_index;
 624                 } else {
 625                         /* XXX chain error */
 626                         kprintf("bad chain type readdir %d\n", bref.type);
 627                 }
 628         }
 629         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
 630         if (error == ENOENT) {
 631                 error = 0;
 632                 eofflag = 1;
 633                 saveoff = (hammer2_key_t)-1;
 634         } else {
 635                 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK;
 636         }
 637 done:
 638         hammer2_inode_unlock(ip);
 639         if (ap->a_eofflag)
 640                 *ap->a_eofflag = eofflag;
 641         if (hammer2_debug & 0x0020)
 642                 kprintf("readdir: done at %016jx\n", saveoff);
 643         uio->uio_offset = saveoff & ~HAMMER2_DIRHASH_VISIBLE;
 644         if (error && cookie_index == 0) {
 645                 if (cookies) {
 646                         kfree(cookies, M_TEMP);
 647                         *ap->a_ncookies = 0;
 648                         *ap->a_cookies = NULL;
 649                 }
 650         } else {
 651                 if (cookies) {
 652                         *ap->a_ncookies = cookie_index;
 653                         *ap->a_cookies = cookies;
 654                 }
 655         }
 656         LOCKSTOP;
 657         return (error);
 658 }
 659
 660 /*
 661  * hammer2_vop_readlink { vp, uio, cred }
 662  */
 663 static
 664 int
 665 hammer2_vop_readlink(struct vop_readlink_args *ap)
 666 {
 667         struct vnode *vp;
 668         hammer2_inode_t *ip;
 669         int error;
 670
 671         vp = ap->a_vp;
 672         if (vp->v_type != VLNK)
 673                 return (EINVAL);
 674         ip = VTOI(vp);
 675
 676         error = hammer2_read_file(ip, ap->a_uio, 0);
 677         return (error);
 678 }
 679
 680 static
 681 int
 682 hammer2_vop_read(struct vop_read_args *ap)
 683 {
 684         struct vnode *vp;
 685         hammer2_inode_t *ip;
 686         struct uio *uio;
 687         int error;
 688         int seqcount;
 689         int bigread;
 690
 691         /*
 692          * Read operations supported on this vnode?
 693          */
 694         vp = ap->a_vp;
 695         if (vp->v_type != VREG)
 696                 return (EINVAL);
 697
 698         /*
 699          * Misc
 700          */
 701         ip = VTOI(vp);
 702         uio = ap->a_uio;
 703         error = 0;
 704
 705         seqcount = ap->a_ioflag >> 16;
 706         bigread = (uio->uio_resid > 100 * 1024 * 1024);
 707
 708         error = hammer2_read_file(ip, uio, seqcount);
 709         return (error);
 710 }
 711
 712 static
 713 int
 714 hammer2_vop_write(struct vop_write_args *ap)
 715 {
 716         hammer2_inode_t *ip;
 717         thread_t td;
 718         struct vnode *vp;
 719         struct uio *uio;
 720         int error;
 721         int seqcount;
 722
 723         /*
 724          * Read operations supported on this vnode?
 725          */
 726         vp = ap->a_vp;
 727         if (vp->v_type != VREG)
 728                 return (EINVAL);
 729
 730         /*
 731          * Misc
 732          */
 733         ip = VTOI(vp);
 734         uio = ap->a_uio;
 735         error = 0;
 736         if (ip->pmp->ronly) {
 737                 return (EROFS);
 738         }
 739
 740         seqcount = ap->a_ioflag >> 16;
 741
 742         /*
 743          * Check resource limit
 744          */
 745         if (uio->uio_resid > 0 && (td = uio->uio_td) != NULL && td->td_proc &&
 746             uio->uio_offset + uio->uio_resid >
 747              td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
 748                 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ);
 749                 return (EFBIG);
 750         }
 751
 752         /*
 753          * The transaction interlocks against flushes initiations
 754          * (note: but will run concurrently with the actual flush).
 755          */
 756         hammer2_trans_init(ip->pmp, 0);
 757         error = hammer2_write_file(ip, uio, ap->a_ioflag, seqcount);
 758         hammer2_trans_done(ip->pmp);
 759
 760         return (error);
 761 }
 762
 763 /*
 764  * Perform read operations on a file or symlink given an UNLOCKED
 765  * inode and uio.
 766  *
 767  * The passed ip is not locked.
 768  */
 769 static
 770 int
 771 hammer2_read_file(hammer2_inode_t *ip, struct uio *uio, int seqcount)
 772 {
 773         hammer2_off_t size;
 774         struct buf *bp;
 775         int error;
 776
 777         error = 0;
 778
 779         /*
 780          * UIO read loop.
 781          *
 782          * WARNING! Assumes that the kernel interlocks size changes at the
 783          *          vnode level.
 784          */
 785         hammer2_mtx_sh(&ip->lock);
 786         hammer2_mtx_sh(&ip->truncate_lock);
 787         size = ip->meta.size;
 788         hammer2_mtx_unlock(&ip->lock);
 789
 790         while (uio->uio_resid > 0 && uio->uio_offset < size) {
 791                 hammer2_key_t lbase;
 792                 hammer2_key_t leof;
 793                 int lblksize;
 794                 int loff;
 795                 int n;
 796
 797                 lblksize = hammer2_calc_logical(ip, uio->uio_offset,
 798                                                 &lbase, &leof);
 799
 800 #if 1
 801                 error = cluster_read(ip->vp, leof, lbase, lblksize,
 802                                      uio->uio_resid, seqcount * MAXBSIZE,
 803                                      &bp);
 804 #else
 805                 if (uio->uio_segflg == UIO_NOCOPY) {
 806                         bp = getblk(ip->vp, lbase, lblksize, GETBLK_BHEAVY, 0);
 807                         if (bp->b_flags & B_CACHE) {
 808                                 int i;
 809                                 int j = 0;
 810                                 if (bp->b_xio.xio_npages != 16)
 811                                         kprintf("NPAGES BAD\n");
 812                                 for (i = 0; i < bp->b_xio.xio_npages; ++i) {
 813                                         vm_page_t m;
 814                                         m = bp->b_xio.xio_pages[i];
 815                                         if (m == NULL || m->valid == 0) {
 816                                                 kprintf("bp %016jx %016jx pg %d inv",
 817                                                         lbase, leof, i);
 818                                                 if (m)
 819                                                         kprintf("m->object %p/%p", m->object, ip->vp->v_object);
 820                                                 kprintf("\n");
 821                                                 j = 1;
 822                                         }
 823                                 }
 824                                 if (j)
 825                                         kprintf("b_flags %08x, b_error %d\n", bp->b_flags, bp->b_error);
 826                         }
 827                         bqrelse(bp);
 828                 }
 829                 error = bread(ip->vp, lbase, lblksize, &bp);
 830 #endif
 831                 if (error) {
 832                         brelse(bp);
 833                         break;
 834                 }
 835                 loff = (int)(uio->uio_offset - lbase);
 836                 n = lblksize - loff;
 837                 if (n > uio->uio_resid)
 838                         n = uio->uio_resid;
 839                 if (n > size - uio->uio_offset)
 840                         n = (int)(size - uio->uio_offset);
 841                 bp->b_flags |= B_AGE;
 842                 uiomovebp(bp, (char *)bp->b_data + loff, n, uio);
 843                 bqrelse(bp);
 844         }
 845         hammer2_mtx_unlock(&ip->truncate_lock);
 846
 847         return (error);
 848 }
 849
 850 /*
 851  * Write to the file represented by the inode via the logical buffer cache.
 852  * The inode may represent a regular file or a symlink.
 853  *
 854  * The inode must not be locked.
 855  */
 856 static
 857 int
 858 hammer2_write_file(hammer2_inode_t *ip, struct uio *uio,
 859                    int ioflag, int seqcount)
 860 {
 861         hammer2_key_t old_eof;
 862         hammer2_key_t new_eof;
 863         struct buf *bp;
 864         int kflags;
 865         int error;
 866         int modified;
 867
 868         /*
 869          * Setup if append
 870          *
 871          * WARNING! Assumes that the kernel interlocks size changes at the
 872          *          vnode level.
 873          */
 874         hammer2_mtx_ex(&ip->lock);
 875         hammer2_mtx_sh(&ip->truncate_lock);
 876         if (ioflag & IO_APPEND)
 877                 uio->uio_offset = ip->meta.size;
 878         old_eof = ip->meta.size;
 879
 880         /*
 881          * Extend the file if necessary.  If the write fails at some point
 882          * we will truncate it back down to cover as much as we were able
 883          * to write.
 884          *
 885          * Doing this now makes it easier to calculate buffer sizes in
 886          * the loop.
 887          */
 888         kflags = 0;
 889         error = 0;
 890         modified = 0;
 891
 892         if (uio->uio_offset + uio->uio_resid > old_eof) {
 893                 new_eof = uio->uio_offset + uio->uio_resid;
 894                 modified = 1;
 895                 hammer2_extend_file(ip, new_eof);
 896                 kflags |= NOTE_EXTEND;
 897         } else {
 898                 new_eof = old_eof;
 899         }
 900         hammer2_mtx_unlock(&ip->lock);
 901
 902         /*
 903          * UIO write loop
 904          */
 905         while (uio->uio_resid > 0) {
 906                 hammer2_key_t lbase;
 907                 int trivial;
 908                 int endofblk;
 909                 int lblksize;
 910                 int loff;
 911                 int n;
 912
 913                 /*
 914                  * Don't allow the buffer build to blow out the buffer
 915                  * cache.
 916                  */
 917                 if ((ioflag & IO_RECURSE) == 0)
 918                         bwillwrite(HAMMER2_PBUFSIZE);
 919
 920                 /*
 921                  * This nominally tells us how much we can cluster and
 922                  * what the logical buffer size needs to be.  Currently
 923                  * we don't try to cluster the write and just handle one
 924                  * block at a time.
 925                  */
 926                 lblksize = hammer2_calc_logical(ip, uio->uio_offset,
 927                                                 &lbase, NULL);
 928                 loff = (int)(uio->uio_offset - lbase);
 929
 930                 KKASSERT(lblksize <= 65536);
 931
 932                 /*
 933                  * Calculate bytes to copy this transfer and whether the
 934                  * copy completely covers the buffer or not.
 935                  */
 936                 trivial = 0;
 937                 n = lblksize - loff;
 938                 if (n > uio->uio_resid) {
 939                         n = uio->uio_resid;
 940                         if (loff == lbase && uio->uio_offset + n == new_eof)
 941                                 trivial = 1;
 942                         endofblk = 0;
 943                 } else {
 944                         if (loff == 0)
 945                                 trivial = 1;
 946                         endofblk = 1;
 947                 }
 948                 if (lbase >= new_eof)
 949                         trivial = 1;
 950
 951                 /*
 952                  * Get the buffer
 953                  */
 954                 if (uio->uio_segflg == UIO_NOCOPY) {
 955                         /*
 956                          * Issuing a write with the same data backing the
 957                          * buffer.  Instantiate the buffer to collect the
 958                          * backing vm pages, then read-in any missing bits.
 959                          *
 960                          * This case is used by vop_stdputpages().
 961                          */
 962                         bp = getblk(ip->vp, lbase, lblksize, GETBLK_BHEAVY, 0);
 963                         if ((bp->b_flags & B_CACHE) == 0) {
 964                                 bqrelse(bp);
 965                                 error = bread(ip->vp, lbase, lblksize, &bp);
 966                         }
 967                 } else if (trivial) {
 968                         /*
 969                          * Even though we are entirely overwriting the buffer
 970                          * we may still have to zero it out to avoid a
 971                          * mmap/write visibility issue.
 972                          */
 973                         bp = getblk(ip->vp, lbase, lblksize, GETBLK_BHEAVY, 0);
 974                         if ((bp->b_flags & B_CACHE) == 0)
 975                                 vfs_bio_clrbuf(bp);
 976                 } else {
 977                         /*
 978                          * Partial overwrite, read in any missing bits then
 979                          * replace the portion being written.
 980                          *
 981                          * (The strategy code will detect zero-fill physical
 982                          * blocks for this case).
 983                          */
 984                         error = bread(ip->vp, lbase, lblksize, &bp);
 985                         if (error == 0)
 986                                 bheavy(bp);
 987                 }
 988
 989                 if (error) {
 990                         brelse(bp);
 991                         break;
 992                 }
 993
 994                 /*
 995                  * Ok, copy the data in
 996                  */
 997                 error = uiomovebp(bp, bp->b_data + loff, n, uio);
 998                 kflags |= NOTE_WRITE;
 999                 modified = 1;
1000                 if (error) {
1001                         brelse(bp);
1002                         break;
1003                 }
1004
1005                 /*
1006                  * WARNING: Pageout daemon will issue UIO_NOCOPY writes
1007                  *          with IO_SYNC or IO_ASYNC set.  These writes
1008                  *          must be handled as the pageout daemon expects.
1009                  *
1010                  * NOTE!    H2 relies on cluster_write() here because it
1011                  *          cannot preallocate disk blocks at the logical
1012                  *          level due to not knowing what the compression
1013                  *          size will be at this time.
1014                  *
1015                  *          We must use cluster_write() here and we depend
1016                  *          on the write-behind feature to flush buffers
1017                  *          appropriately.  If we let the buffer daemons do
1018                  *          it the block allocations will be all over the
1019                  *          map.
1020                  */
1021                 if (ioflag & IO_SYNC) {
1022                         bwrite(bp);
1023                 } else if ((ioflag & IO_DIRECT) && endofblk) {
1024                         bawrite(bp);
1025                 } else if (ioflag & IO_ASYNC) {
1026                         bawrite(bp);
1027                 } else if (ip->vp->v_mount->mnt_flag & MNT_NOCLUSTERW) {
1028                         bdwrite(bp);
1029                 } else {
1030 #if 1
1031                         bp->b_flags |= B_CLUSTEROK;
1032                         cluster_write(bp, new_eof, lblksize, seqcount);
1033 #else
1034                         bp->b_flags |= B_CLUSTEROK;
1035                         bdwrite(bp);
1036 #endif
1037                 }
1038         }
1039
1040         /*
1041          * Cleanup.  If we extended the file EOF but failed to write through
1042          * the entire write is a failure and we have to back-up.
1043          */
1044         if (error && new_eof != old_eof) {
1045                 hammer2_mtx_unlock(&ip->truncate_lock);
1046                 hammer2_mtx_ex(&ip->lock);
1047                 hammer2_mtx_ex(&ip->truncate_lock);
1048                 hammer2_truncate_file(ip, old_eof);
1049                 if (ip->flags & HAMMER2_INODE_MODIFIED)
1050                         hammer2_inode_chain_sync(ip);
1051                 hammer2_mtx_unlock(&ip->lock);
1052         } else if (modified) {
1053                 hammer2_mtx_ex(&ip->lock);
1054                 hammer2_inode_modify(ip);
1055                 hammer2_update_time(&ip->meta.mtime);
1056                 if (ip->flags & HAMMER2_INODE_MODIFIED)
1057                         hammer2_inode_chain_sync(ip);
1058                 hammer2_mtx_unlock(&ip->lock);
1059                 hammer2_knote(ip->vp, kflags);
1060         }
1061         hammer2_trans_assert_strategy(ip->pmp);
1062         hammer2_mtx_unlock(&ip->truncate_lock);
1063
1064         return error;
1065 }
1066
1067 /*
1068  * Truncate the size of a file.  The inode must not be locked.
1069  *
1070  * We must unconditionally set HAMMER2_INODE_RESIZED to properly
1071  * ensure that any on-media data beyond the new file EOF has been destroyed.
1072  *
1073  * WARNING: nvtruncbuf() can only be safely called without the inode lock
1074  *          held due to the way our write thread works.  If the truncation
1075  *          occurs in the middle of a buffer, nvtruncbuf() is responsible
1076  *          for dirtying that buffer and zeroing out trailing bytes.
1077  *
1078  * WARNING! Assumes that the kernel interlocks size changes at the
1079  *          vnode level.
1080  *
1081  * WARNING! Caller assumes responsibility for removing dead blocks
1082  *          if INODE_RESIZED is set.
1083  */
1084 static
1085 void
1086 hammer2_truncate_file(hammer2_inode_t *ip, hammer2_key_t nsize)
1087 {
1088         hammer2_key_t lbase;
1089         int nblksize;
1090
1091         LOCKSTART;
1092         hammer2_mtx_unlock(&ip->lock);
1093         if (ip->vp) {
1094                 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL);
1095                 nvtruncbuf(ip->vp, nsize,
1096                            nblksize, (int)nsize & (nblksize - 1),
1097                            0);
1098         }
1099         hammer2_mtx_ex(&ip->lock);
1100         KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0);
1101         ip->osize = ip->meta.size;
1102         ip->meta.size = nsize;
1103         atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED);
1104         hammer2_inode_modify(ip);
1105         LOCKSTOP;
1106 }
1107
1108 /*
1109  * Extend the size of a file.  The inode must not be locked.
1110  *
1111  * Even though the file size is changing, we do not have to set the
1112  * INODE_RESIZED bit unless the file size crosses the EMBEDDED_BYTES
1113  * boundary.  When this occurs a hammer2_inode_chain_sync() is required
1114  * to prepare the inode cluster's indirect block table, otherwise
1115  * async execution of the strategy code will implode on us.
1116  *
1117  * WARNING! Assumes that the kernel interlocks size changes at the
1118  *          vnode level.
1119  *
1120  * WARNING! Caller assumes responsibility for transitioning out
1121  *          of the inode DIRECTDATA mode if INODE_RESIZED is set.
1122  */
1123 static
1124 void
1125 hammer2_extend_file(hammer2_inode_t *ip, hammer2_key_t nsize)
1126 {
1127         hammer2_key_t lbase;
1128         hammer2_key_t osize;
1129         int oblksize;
1130         int nblksize;
1131
1132         LOCKSTART;
1133
1134         KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0);
1135         hammer2_inode_modify(ip);
1136         osize = ip->meta.size;
1137         ip->osize = osize;
1138         ip->meta.size = nsize;
1139
1140         if (osize <= HAMMER2_EMBEDDED_BYTES && nsize > HAMMER2_EMBEDDED_BYTES) {
1141                 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED);
1142                 hammer2_inode_chain_sync(ip);
1143         }
1144
1145         hammer2_mtx_unlock(&ip->lock);
1146         if (ip->vp) {
1147                 oblksize = hammer2_calc_logical(ip, osize, &lbase, NULL);
1148                 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL);
1149                 nvextendbuf(ip->vp,
1150                             osize, nsize,
1151                             oblksize, nblksize,
1152                             -1, -1, 0);
1153         }
1154         hammer2_mtx_ex(&ip->lock);
1155
1156         LOCKSTOP;
1157 }
1158
1159 static
1160 int
1161 hammer2_vop_nresolve(struct vop_nresolve_args *ap)
1162 {
1163         hammer2_xop_nresolve_t *xop;
1164         hammer2_inode_t *ip;
1165         hammer2_inode_t *dip;
1166         struct namecache *ncp;
1167         struct vnode *vp;
1168         int error;
1169
1170         LOCKSTART;
1171         dip = VTOI(ap->a_dvp);
1172         xop = hammer2_xop_alloc(dip, 0);
1173
1174         ncp = ap->a_nch->ncp;
1175         hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen);
1176
1177         /*
1178          * Note: In DragonFly the kernel handles '.' and '..'.
1179          */
1180         hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1181         hammer2_xop_start(&xop->head, hammer2_xop_nresolve);
1182
1183         error = hammer2_xop_collect(&xop->head, 0);
1184         if (error) {
1185                 ip = NULL;
1186         } else {
1187                 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1);
1188         }
1189         hammer2_inode_unlock(dip);
1190
1191         /*
1192          * Acquire the related vnode
1193          *
1194          * NOTE: For error processing, only ENOENT resolves the namecache
1195          *       entry to NULL, otherwise we just return the error and
1196          *       leave the namecache unresolved.
1197          *
1198          * NOTE: multiple hammer2_inode structures can be aliased to the
1199          *       same chain element, for example for hardlinks.  This
1200          *       use case does not 'reattach' inode associations that
1201          *       might already exist, but always allocates a new one.
1202          *
1203          * WARNING: inode structure is locked exclusively via inode_get
1204          *          but chain was locked shared.  inode_unlock()
1205          *          will handle it properly.
1206          */
1207         if (ip) {
1208                 vp = hammer2_igetv(ip, &error);
1209                 if (error == 0) {
1210                         vn_unlock(vp);
1211                         cache_setvp(ap->a_nch, vp);
1212                 } else if (error == ENOENT) {
1213                         cache_setvp(ap->a_nch, NULL);
1214                 }
1215                 hammer2_inode_unlock(ip);
1216
1217                 /*
1218                  * The vp should not be released until after we've disposed
1219                  * of our locks, because it might cause vop_inactive() to
1220                  * be called.
1221                  */
1222                 if (vp)
1223                         vrele(vp);
1224         } else {
1225                 error = ENOENT;
1226                 cache_setvp(ap->a_nch, NULL);
1227         }
1228         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1229         KASSERT(error || ap->a_nch->ncp->nc_vp != NULL,
1230                 ("resolve error %d/%p ap %p\n",
1231                  error, ap->a_nch->ncp->nc_vp, ap));
1232         LOCKSTOP;
1233
1234         return error;
1235 }
1236
1237 static
1238 int
1239 hammer2_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
1240 {
1241         hammer2_inode_t *dip;
1242         hammer2_tid_t inum;
1243         int error;
1244
1245         LOCKSTART;
1246         dip = VTOI(ap->a_dvp);
1247         inum = dip->meta.iparent;
1248         *ap->a_vpp = NULL;
1249
1250         if (inum) {
1251                 error = hammer2_vfs_vget(ap->a_dvp->v_mount, NULL,
1252                                          inum, ap->a_vpp);
1253         } else {
1254                 error = ENOENT;
1255         }
1256         LOCKSTOP;
1257         return error;
1258 }
1259
1260 static
1261 int
1262 hammer2_vop_nmkdir(struct vop_nmkdir_args *ap)
1263 {
1264         hammer2_inode_t *dip;
1265         hammer2_inode_t *nip;
1266         struct namecache *ncp;
1267         const uint8_t *name;
1268         size_t name_len;
1269         hammer2_tid_t inum;
1270         int error;
1271
1272         LOCKSTART;
1273         dip = VTOI(ap->a_dvp);
1274         if (dip->pmp->ronly) {
1275                 LOCKSTOP;
1276                 return (EROFS);
1277         }
1278
1279         ncp = ap->a_nch->ncp;
1280         name = ncp->nc_name;
1281         name_len = ncp->nc_nlen;
1282
1283         hammer2_pfs_memory_wait(dip->pmp);
1284         hammer2_trans_init(dip->pmp, 0);
1285
1286         inum = hammer2_trans_newinum(dip->pmp);
1287
1288         /*
1289          * Create the actual inode as a hidden file in the iroot, then
1290          * create the directory entry as a hardlink to it.  The creation
1291          * of the actual inode sets its nlinks to 1 which is the value
1292          * we desire.
1293          */
1294         nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred,
1295                                    NULL, 0, inum,
1296                                    inum, 0, 0,
1297                                    0, &error);
1298         if (error == 0) {
1299                 hammer2_inode_create(dip, dip, NULL, NULL,
1300                                      name, name_len, 0,
1301                                      nip->meta.inum,
1302                                      HAMMER2_OBJTYPE_HARDLINK, nip->meta.type,
1303                                      0, &error);
1304         }
1305
1306         if (error) {
1307                 KKASSERT(nip == NULL);
1308                 *ap->a_vpp = NULL;
1309         } else {
1310                 *ap->a_vpp = hammer2_igetv(nip, &error);
1311                 hammer2_inode_unlock(nip);
1312         }
1313
1314         /*
1315          * Update dip's mtime
1316          */
1317         if (error == 0) {
1318                 uint64_t mtime;
1319
1320                 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1321                 hammer2_update_time(&mtime);
1322                 hammer2_inode_modify(dip);
1323                 dip->meta.mtime = mtime;
1324                 hammer2_inode_unlock(dip);
1325         }
1326
1327         hammer2_trans_done(dip->pmp);
1328
1329         if (error == 0) {
1330                 cache_setunresolved(ap->a_nch);
1331                 cache_setvp(ap->a_nch, *ap->a_vpp);
1332         }
1333         LOCKSTOP;
1334         return error;
1335 }
1336
1337 static
1338 int
1339 hammer2_vop_open(struct vop_open_args *ap)
1340 {
1341         return vop_stdopen(ap);
1342 }
1343
1344 /*
1345  * hammer2_vop_advlock { vp, id, op, fl, flags }
1346  */
1347 static
1348 int
1349 hammer2_vop_advlock(struct vop_advlock_args *ap)
1350 {
1351         hammer2_inode_t *ip = VTOI(ap->a_vp);
1352         hammer2_off_t size;
1353
1354         size = ip->meta.size;
1355         return (lf_advlock(ap, &ip->advlock, size));
1356 }
1357
1358 static
1359 int
1360 hammer2_vop_close(struct vop_close_args *ap)
1361 {
1362         return vop_stdclose(ap);
1363 }
1364
1365 /*
1366  * hammer2_vop_nlink { nch, dvp, vp, cred }
1367  *
1368  * Create a hardlink from (vp) to {dvp, nch}.
1369  */
1370 static
1371 int
1372 hammer2_vop_nlink(struct vop_nlink_args *ap)
1373 {
1374         hammer2_inode_t *tdip;  /* target directory to create link in */
1375         hammer2_inode_t *ip;    /* inode we are hardlinking to */
1376         struct namecache *ncp;
1377         const uint8_t *name;
1378         size_t name_len;
1379         int error;
1380
1381         if (ap->a_dvp->v_mount != ap->a_vp->v_mount)
1382                 return(EXDEV);
1383
1384         LOCKSTART;
1385         tdip = VTOI(ap->a_dvp);
1386         if (tdip->pmp->ronly) {
1387                 LOCKSTOP;
1388                 return (EROFS);
1389         }
1390
1391         ncp = ap->a_nch->ncp;
1392         name = ncp->nc_name;
1393         name_len = ncp->nc_nlen;
1394
1395         /*
1396          * ip represents the file being hardlinked.  The file could be a
1397          * normal file or a hardlink target if it has already been hardlinked.
1398          * (with the new semantics, it will almost always be a hardlink
1399          * target).
1400          *
1401          * Bump nlinks and potentially also create or move the hardlink
1402          * target in the parent directory common to (ip) and (tdip).  The
1403          * consolidation code can modify ip->cluster.  The returned cluster
1404          * is locked.
1405          */
1406         ip = VTOI(ap->a_vp);
1407         KASSERT(ip->pmp, ("ip->pmp is NULL %p %p", ip, ip->pmp));
1408         hammer2_pfs_memory_wait(ip->pmp);
1409         hammer2_trans_init(ip->pmp, 0);
1410
1411         /*
1412          * Target should be an indexed inode or there's no way we will ever
1413          * be able to find it!
1414          */
1415         KKASSERT((ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE) == 0);
1416
1417         error = 0;
1418
1419         /*
1420          * Can return NULL and error == EXDEV if the common parent
1421          * crosses a directory with the xlink flag set.
1422          */
1423         hammer2_inode_lock(tdip, 0);
1424         hammer2_inode_lock(ip, 0);
1425
1426         /*
1427          * Create the hardlink target and bump nlinks.
1428          */
1429         if (error == 0) {
1430                 hammer2_inode_create(tdip, tdip, NULL, NULL,
1431                                      name, name_len, 0,
1432                                      ip->meta.inum,
1433                                      HAMMER2_OBJTYPE_HARDLINK, ip->meta.type,
1434                                      0, &error);
1435                 hammer2_inode_modify(ip);
1436                 ++ip->meta.nlinks;
1437         }
1438         if (error == 0) {
1439                 /*
1440                  * Update dip's mtime
1441                  */
1442                 uint64_t mtime;
1443
1444                 hammer2_update_time(&mtime);
1445                 hammer2_inode_modify(tdip);
1446                 tdip->meta.mtime = mtime;
1447
1448                 cache_setunresolved(ap->a_nch);
1449                 cache_setvp(ap->a_nch, ap->a_vp);
1450         }
1451         hammer2_inode_unlock(ip);
1452         hammer2_inode_unlock(tdip);
1453
1454         hammer2_trans_done(ip->pmp);
1455
1456         LOCKSTOP;
1457         return error;
1458 }
1459
1460 /*
1461  * hammer2_vop_ncreate { nch, dvp, vpp, cred, vap }
1462  *
1463  * The operating system has already ensured that the directory entry
1464  * does not exist and done all appropriate namespace locking.
1465  */
1466 static
1467 int
1468 hammer2_vop_ncreate(struct vop_ncreate_args *ap)
1469 {
1470         hammer2_inode_t *dip;
1471         hammer2_inode_t *nip;
1472         struct namecache *ncp;
1473         const uint8_t *name;
1474         size_t name_len;
1475         hammer2_tid_t inum;
1476         int error;
1477
1478         LOCKSTART;
1479         dip = VTOI(ap->a_dvp);
1480         if (dip->pmp->ronly) {
1481                 LOCKSTOP;
1482                 return (EROFS);
1483         }
1484
1485         ncp = ap->a_nch->ncp;
1486         name = ncp->nc_name;
1487         name_len = ncp->nc_nlen;
1488         hammer2_pfs_memory_wait(dip->pmp);
1489         hammer2_trans_init(dip->pmp, 0);
1490
1491         inum = hammer2_trans_newinum(dip->pmp);
1492
1493         /*
1494          * Create the actual inode as a hidden file in the iroot, then
1495          * create the directory entry as a hardlink to it.  The creation
1496          * of the actual inode sets its nlinks to 1 which is the value
1497          * we desire.
1498          */
1499         nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred,
1500                                    NULL, 0, inum,
1501                                    inum, 0, 0,
1502                                    0, &error);
1503
1504         if (error == 0) {
1505                 hammer2_inode_create(dip, dip, NULL, NULL,
1506                                      name, name_len, 0,
1507                                      nip->meta.inum,
1508                                      HAMMER2_OBJTYPE_HARDLINK, nip->meta.type,
1509                                      0, &error);
1510         }
1511         if (error) {
1512                 KKASSERT(nip == NULL);
1513                 *ap->a_vpp = NULL;
1514         } else {
1515                 *ap->a_vpp = hammer2_igetv(nip, &error);
1516                 hammer2_inode_unlock(nip);
1517         }
1518
1519         /*
1520          * Update dip's mtime
1521          */
1522         if (error == 0) {
1523                 uint64_t mtime;
1524
1525                 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1526                 hammer2_update_time(&mtime);
1527                 hammer2_inode_modify(dip);
1528                 dip->meta.mtime = mtime;
1529                 hammer2_inode_unlock(dip);
1530         }
1531
1532         hammer2_trans_done(dip->pmp);
1533
1534         if (error == 0) {
1535                 cache_setunresolved(ap->a_nch);
1536                 cache_setvp(ap->a_nch, *ap->a_vpp);
1537         }
1538         LOCKSTOP;
1539         return error;
1540 }
1541
1542 /*
1543  * Make a device node (typically a fifo)
1544  */
1545 static
1546 int
1547 hammer2_vop_nmknod(struct vop_nmknod_args *ap)
1548 {
1549         hammer2_inode_t *dip;
1550         hammer2_inode_t *nip;
1551         struct namecache *ncp;
1552         const uint8_t *name;
1553         size_t name_len;
1554         hammer2_tid_t inum;
1555         int error;
1556
1557         LOCKSTART;
1558         dip = VTOI(ap->a_dvp);
1559         if (dip->pmp->ronly) {
1560                 LOCKSTOP;
1561                 return (EROFS);
1562         }
1563
1564         ncp = ap->a_nch->ncp;
1565         name = ncp->nc_name;
1566         name_len = ncp->nc_nlen;
1567         hammer2_pfs_memory_wait(dip->pmp);
1568         hammer2_trans_init(dip->pmp, 0);
1569
1570         /*
1571          * The device node is entered as the directory entry itself and not
1572          * as a hardlink to an inode.  Since one cannot obtain a
1573          * file handle on the filesystem entry representing the device, we
1574          * do not have to worry about indexing its inode.
1575          */
1576         inum = hammer2_trans_newinum(dip->pmp);
1577         nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred,
1578                                    NULL, 0, inum,
1579                                    inum, 0, 0,
1580                                    0, &error);
1581         if (error == 0) {
1582                 hammer2_inode_create(dip, dip, NULL, NULL,
1583                                      name, name_len, 0,
1584                                      nip->meta.inum,
1585                                      HAMMER2_OBJTYPE_HARDLINK, nip->meta.type,
1586                                      0, &error);
1587         }
1588
1589
1590         if (error) {
1591                 KKASSERT(nip == NULL);
1592                 *ap->a_vpp = NULL;
1593         } else {
1594                 *ap->a_vpp = hammer2_igetv(nip, &error);
1595                 hammer2_inode_unlock(nip);
1596         }
1597
1598         /*
1599          * Update dip's mtime
1600          */
1601         if (error == 0) {
1602                 uint64_t mtime;
1603
1604                 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1605                 hammer2_update_time(&mtime);
1606                 hammer2_inode_modify(dip);
1607                 dip->meta.mtime = mtime;
1608                 hammer2_inode_unlock(dip);
1609         }
1610
1611         hammer2_trans_done(dip->pmp);
1612
1613         if (error == 0) {
1614                 cache_setunresolved(ap->a_nch);
1615                 cache_setvp(ap->a_nch, *ap->a_vpp);
1616         }
1617         LOCKSTOP;
1618         return error;
1619 }
1620
1621 /*
1622  * hammer2_vop_nsymlink { nch, dvp, vpp, cred, vap, target }
1623  */
1624 static
1625 int
1626 hammer2_vop_nsymlink(struct vop_nsymlink_args *ap)
1627 {
1628         hammer2_inode_t *dip;
1629         hammer2_inode_t *nip;
1630         struct namecache *ncp;
1631         const uint8_t *name;
1632         size_t name_len;
1633         hammer2_tid_t inum;
1634         int error;
1635
1636         dip = VTOI(ap->a_dvp);
1637         if (dip->pmp->ronly)
1638                 return (EROFS);
1639
1640         ncp = ap->a_nch->ncp;
1641         name = ncp->nc_name;
1642         name_len = ncp->nc_nlen;
1643         hammer2_pfs_memory_wait(dip->pmp);
1644         hammer2_trans_init(dip->pmp, 0);
1645
1646         ap->a_vap->va_type = VLNK;      /* enforce type */
1647
1648         /*
1649          * The softlink is entered into the directory itself and not
1650          * as a hardlink to an inode.  Since one cannot obtain a
1651          * file handle on the softlink itself we do not have to worry
1652          * about indexing its inode.
1653          */
1654         inum = hammer2_trans_newinum(dip->pmp);
1655
1656         nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred,
1657                                    NULL, 0, inum,
1658                                    inum, 0, 0,
1659                                    0, &error);
1660         if (error == 0) {
1661                 hammer2_inode_create(dip, dip, NULL, NULL,
1662                                      name, name_len, 0,
1663                                      nip->meta.inum,
1664                                      HAMMER2_OBJTYPE_HARDLINK, nip->meta.type,
1665                                      0, &error);
1666         }
1667
1668
1669         if (error) {
1670                 KKASSERT(nip == NULL);
1671                 *ap->a_vpp = NULL;
1672                 hammer2_trans_done(dip->pmp);
1673                 return error;
1674         }
1675         *ap->a_vpp = hammer2_igetv(nip, &error);
1676
1677         /*
1678          * Build the softlink (~like file data) and finalize the namecache.
1679          */
1680         if (error == 0) {
1681                 size_t bytes;
1682                 struct uio auio;
1683                 struct iovec aiov;
1684
1685                 bytes = strlen(ap->a_target);
1686
1687                 hammer2_inode_unlock(nip);
1688                 bzero(&auio, sizeof(auio));
1689                 bzero(&aiov, sizeof(aiov));
1690                 auio.uio_iov = &aiov;
1691                 auio.uio_segflg = UIO_SYSSPACE;
1692                 auio.uio_rw = UIO_WRITE;
1693                 auio.uio_resid = bytes;
1694                 auio.uio_iovcnt = 1;
1695                 auio.uio_td = curthread;
1696                 aiov.iov_base = ap->a_target;
1697                 aiov.iov_len = bytes;
1698                 error = hammer2_write_file(nip, &auio, IO_APPEND, 0);
1699                 /* XXX handle error */
1700                 error = 0;
1701         } else {
1702                 hammer2_inode_unlock(nip);
1703         }
1704
1705         /*
1706          * Update dip's mtime
1707          */
1708         if (error == 0) {
1709                 uint64_t mtime;
1710
1711                 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1712                 hammer2_update_time(&mtime);
1713                 hammer2_inode_modify(dip);
1714                 dip->meta.mtime = mtime;
1715                 hammer2_inode_unlock(dip);
1716         }
1717
1718         hammer2_trans_done(dip->pmp);
1719
1720         /*
1721          * Finalize namecache
1722          */
1723         if (error == 0) {
1724                 cache_setunresolved(ap->a_nch);
1725                 cache_setvp(ap->a_nch, *ap->a_vpp);
1726                 /* hammer2_knote(ap->a_dvp, NOTE_WRITE); */
1727         }
1728         return error;
1729 }
1730
1731 /*
1732  * hammer2_vop_nremove { nch, dvp, cred }
1733  */
1734 static
1735 int
1736 hammer2_vop_nremove(struct vop_nremove_args *ap)
1737 {
1738         hammer2_xop_unlink_t *xop;
1739         hammer2_inode_t *dip;
1740         hammer2_inode_t *ip;
1741         struct namecache *ncp;
1742         int error;
1743         int isopen;
1744
1745         LOCKSTART;
1746         dip = VTOI(ap->a_dvp);
1747         if (dip->pmp->ronly) {
1748                 LOCKSTOP;
1749                 return(EROFS);
1750         }
1751
1752         ncp = ap->a_nch->ncp;
1753
1754         hammer2_pfs_memory_wait(dip->pmp);
1755         hammer2_trans_init(dip->pmp, 0);
1756         hammer2_inode_lock(dip, 0);
1757
1758         /*
1759          * The unlink XOP unlinks the path from the directory and
1760          * locates and returns the cluster associated with the real inode.
1761          * We have to handle nlinks here on the frontend.
1762          */
1763         xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING);
1764         hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen);
1765         isopen = cache_isopen(ap->a_nch);
1766         xop->isdir = 0;
1767         xop->dopermanent = 0;
1768         hammer2_xop_start(&xop->head, hammer2_xop_unlink);
1769
1770         /*
1771          * Collect the real inode and adjust nlinks, destroy the real
1772          * inode if nlinks transitions to 0 and it was the real inode
1773          * (else it has already been removed).
1774          */
1775         error = hammer2_xop_collect(&xop->head, 0);
1776         hammer2_inode_unlock(dip);
1777
1778         if (error == 0) {
1779                 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1);
1780                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1781                 if (ip) {
1782                         hammer2_inode_unlink_finisher(ip, isopen);
1783                         hammer2_inode_unlock(ip);
1784                 }
1785         } else {
1786                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1787         }
1788
1789         /*
1790          * Update dip's mtime
1791          */
1792         if (error == 0) {
1793                 uint64_t mtime;
1794
1795                 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1796                 hammer2_update_time(&mtime);
1797                 hammer2_inode_modify(dip);
1798                 dip->meta.mtime = mtime;
1799                 hammer2_inode_unlock(dip);
1800         }
1801
1802         hammer2_inode_run_sideq(dip->pmp);
1803         hammer2_trans_done(dip->pmp);
1804         if (error == 0)
1805                 cache_unlink(ap->a_nch);
1806         LOCKSTOP;
1807         return (error);
1808 }
1809
1810 /*
1811  * hammer2_vop_nrmdir { nch, dvp, cred }
1812  */
1813 static
1814 int
1815 hammer2_vop_nrmdir(struct vop_nrmdir_args *ap)
1816 {
1817         hammer2_xop_unlink_t *xop;
1818         hammer2_inode_t *dip;
1819         hammer2_inode_t *ip;
1820         struct namecache *ncp;
1821         int isopen;
1822         int error;
1823
1824         LOCKSTART;
1825         dip = VTOI(ap->a_dvp);
1826         if (dip->pmp->ronly) {
1827                 LOCKSTOP;
1828                 return(EROFS);
1829         }
1830
1831         hammer2_pfs_memory_wait(dip->pmp);
1832         hammer2_trans_init(dip->pmp, 0);
1833         hammer2_inode_lock(dip, 0);
1834
1835         xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING);
1836
1837         ncp = ap->a_nch->ncp;
1838         hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen);
1839         isopen = cache_isopen(ap->a_nch);
1840         xop->isdir = 1;
1841         xop->dopermanent = 0;
1842         hammer2_xop_start(&xop->head, hammer2_xop_unlink);
1843
1844         /*
1845          * Collect the real inode and adjust nlinks, destroy the real
1846          * inode if nlinks transitions to 0 and it was the real inode
1847          * (else it has already been removed).
1848          */
1849         error = hammer2_xop_collect(&xop->head, 0);
1850         hammer2_inode_unlock(dip);
1851
1852         if (error == 0) {
1853                 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1);
1854                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1855                 if (ip) {
1856                         hammer2_inode_unlink_finisher(ip, isopen);
1857                         hammer2_inode_unlock(ip);
1858                 }
1859         } else {
1860                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1861         }
1862
1863         /*
1864          * Update dip's mtime
1865          */
1866         if (error == 0) {
1867                 uint64_t mtime;
1868
1869                 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1870                 hammer2_update_time(&mtime);
1871                 hammer2_inode_modify(dip);
1872                 dip->meta.mtime = mtime;
1873                 hammer2_inode_unlock(dip);
1874         }
1875
1876         hammer2_inode_run_sideq(dip->pmp);
1877         hammer2_trans_done(dip->pmp);
1878         if (error == 0)
1879                 cache_unlink(ap->a_nch);
1880         LOCKSTOP;
1881         return (error);
1882 }
1883
1884 /*
1885  * hammer2_vop_nrename { fnch, tnch, fdvp, tdvp, cred }
1886  */
1887 static
1888 int
1889 hammer2_vop_nrename(struct vop_nrename_args *ap)
1890 {
1891         struct namecache *fncp;
1892         struct namecache *tncp;
1893         hammer2_inode_t *fdip;
1894         hammer2_inode_t *tdip;
1895         hammer2_inode_t *ip;
1896         const uint8_t *fname;
1897         size_t fname_len;
1898         const uint8_t *tname;
1899         size_t tname_len;
1900         int error;
1901         int tnch_error;
1902         int update_tdip;
1903         int update_fdip;
1904         hammer2_key_t tlhc;
1905
1906         if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount)
1907                 return(EXDEV);
1908         if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount)
1909                 return(EXDEV);
1910
1911         fdip = VTOI(ap->a_fdvp);        /* source directory */
1912         tdip = VTOI(ap->a_tdvp);        /* target directory */
1913
1914         if (fdip->pmp->ronly)
1915                 return(EROFS);
1916
1917         LOCKSTART;
1918         fncp = ap->a_fnch->ncp;         /* entry name in source */
1919         fname = fncp->nc_name;
1920         fname_len = fncp->nc_nlen;
1921
1922         tncp = ap->a_tnch->ncp;         /* entry name in target */
1923         tname = tncp->nc_name;
1924         tname_len = tncp->nc_nlen;
1925
1926         hammer2_pfs_memory_wait(tdip->pmp);
1927         hammer2_trans_init(tdip->pmp, 0);
1928
1929         update_tdip = 0;
1930         update_fdip = 0;
1931
1932         /*
1933          * ip is the inode being renamed.  If this is a hardlink then
1934          * ip represents the actual file and not the hardlink marker.
1935          */
1936         ip = VTOI(fncp->nc_vp);
1937
1938         KKASSERT((ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE) == 0);
1939
1940         /*
1941          * Can return NULL and error == EXDEV if the common parent
1942          * crosses a directory with the xlink flag set.
1943          */
1944         error = 0;
1945         hammer2_inode_lock(fdip, 0);
1946         hammer2_inode_lock(tdip, 0);
1947         hammer2_inode_ref(ip);          /* extra ref */
1948
1949         hammer2_inode_lock(ip, 0);
1950
1951         /*
1952          * Delete the target namespace.
1953          */
1954         {
1955                 hammer2_xop_unlink_t *xop2;
1956                 hammer2_inode_t *tip;
1957                 int isopen;
1958
1959                 /*
1960                  * The unlink XOP unlinks the path from the directory and
1961                  * locates and returns the cluster associated with the real
1962                  * inode.  We have to handle nlinks here on the frontend.
1963                  */
1964                 xop2 = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING);
1965                 hammer2_xop_setname(&xop2->head, tname, tname_len);
1966                 isopen = cache_isopen(ap->a_tnch);
1967                 xop2->isdir = -1;
1968                 xop2->dopermanent = 0;
1969                 hammer2_xop_start(&xop2->head, hammer2_xop_unlink);
1970
1971                 /*
1972                  * Collect the real inode and adjust nlinks, destroy the real
1973                  * inode if nlinks transitions to 0 and it was the real inode
1974                  * (else it has already been removed).
1975                  */
1976                 tnch_error = hammer2_xop_collect(&xop2->head, 0);
1977                 /* hammer2_inode_unlock(tdip); */
1978
1979                 if (tnch_error == 0) {
1980                         tip = hammer2_inode_get(tdip->pmp, NULL,
1981                                                 &xop2->head.cluster, -1);
1982                         hammer2_xop_retire(&xop2->head, HAMMER2_XOPMASK_VOP);
1983                         if (tip) {
1984                                 hammer2_inode_unlink_finisher(tip, isopen);
1985                                 hammer2_inode_unlock(tip);
1986                         }
1987                 } else {
1988                         hammer2_xop_retire(&xop2->head, HAMMER2_XOPMASK_VOP);
1989                 }
1990                 /* hammer2_inode_lock(tdip, 0); */
1991
1992                 if (tnch_error && tnch_error != ENOENT) {
1993                         error = tnch_error;
1994                         goto done2;
1995                 }
1996                 update_tdip = 1;
1997         }
1998
1999         /*
2000          * Resolve the collision space for (tdip, tname, tname_len)
2001          *
2002          * tdip must be held exclusively locked to prevent races.
2003          */
2004         {
2005                 hammer2_xop_scanlhc_t *sxop;
2006                 hammer2_tid_t lhcbase;
2007
2008                 tlhc = hammer2_dirhash(tname, tname_len);
2009                 lhcbase = tlhc;
2010                 sxop = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING);
2011                 sxop->lhc = tlhc;
2012                 hammer2_xop_start(&sxop->head, hammer2_xop_scanlhc);
2013                 while ((error = hammer2_xop_collect(&sxop->head, 0)) == 0) {
2014                         if (tlhc != sxop->head.cluster.focus->bref.key)
2015                                 break;
2016                         ++tlhc;
2017                 }
2018                 hammer2_xop_retire(&sxop->head, HAMMER2_XOPMASK_VOP);
2019
2020                 if (error) {
2021                         if (error != ENOENT)
2022                                 goto done2;
2023                         ++tlhc;
2024                         error = 0;
2025                 }
2026                 if ((lhcbase ^ tlhc) & ~HAMMER2_DIRHASH_LOMASK) {
2027                         error = ENOSPC;
2028                         goto done2;
2029                 }
2030         }
2031
2032         /*
2033          * Everything is setup, do the rename.
2034          *
2035          * We have to synchronize ip->meta to the underlying operation.
2036          *
2037          * NOTE: To avoid deadlocks we cannot lock (ip) while we are
2038          *       unlinking elements from their directories.  Locking
2039          *       the nlinks field does not lock the whole inode.
2040          */
2041         /* hammer2_inode_lock(ip, 0); */
2042         if (error == 0) {
2043                 hammer2_xop_nrename_t *xop4;
2044
2045                 xop4 = hammer2_xop_alloc(fdip, HAMMER2_XOP_MODIFYING);
2046                 xop4->lhc = tlhc;
2047                 xop4->ip_key = ip->meta.name_key;
2048                 hammer2_xop_setip2(&xop4->head, ip);
2049                 hammer2_xop_setip3(&xop4->head, tdip);
2050                 hammer2_xop_setname(&xop4->head, fname, fname_len);
2051                 hammer2_xop_setname2(&xop4->head, tname, tname_len);
2052                 hammer2_xop_start(&xop4->head, hammer2_xop_nrename);
2053
2054                 error = hammer2_xop_collect(&xop4->head, 0);
2055                 hammer2_xop_retire(&xop4->head, HAMMER2_XOPMASK_VOP);
2056
2057                 if (error == ENOENT)
2058                         error = 0;
2059                 if (error == 0 &&
2060                     (ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE)) {
2061                         hammer2_inode_modify(ip);
2062                         ip->meta.name_len = tname_len;
2063                         ip->meta.name_key = tlhc;
2064
2065                 }
2066                 update_fdip = 1;
2067                 update_fdip = 1;
2068         }
2069
2070 done2:
2071         /*
2072          * Update directory mtimes to represent the something changed.
2073          */
2074         if (update_fdip || update_tdip) {
2075                 uint64_t mtime;
2076
2077                 hammer2_update_time(&mtime);
2078                 if (update_fdip) {
2079                         hammer2_inode_modify(fdip);
2080                         fdip->meta.mtime = mtime;
2081                 }
2082                 if (update_tdip) {
2083                         hammer2_inode_modify(tdip);
2084                         tdip->meta.mtime = mtime;
2085                 }
2086         }
2087         hammer2_inode_unlock(ip);
2088         hammer2_inode_unlock(tdip);
2089         hammer2_inode_unlock(fdip);
2090         hammer2_inode_drop(ip);
2091         hammer2_inode_run_sideq(fdip->pmp);
2092
2093         hammer2_trans_done(tdip->pmp);
2094
2095         /*
2096          * Issue the namecache update after unlocking all the internal
2097          * hammer structures, otherwise we might deadlock.
2098          */
2099         if (tnch_error == 0) {
2100                 cache_unlink(ap->a_tnch);
2101                 cache_setunresolved(ap->a_tnch);
2102         }
2103         if (error == 0)
2104                 cache_rename(ap->a_fnch, ap->a_tnch);
2105
2106         LOCKSTOP;
2107         return (error);
2108 }
2109
2110 /*
2111  * hammer2_vop_ioctl { vp, command, data, fflag, cred }
2112  */
2113 static
2114 int
2115 hammer2_vop_ioctl(struct vop_ioctl_args *ap)
2116 {
2117         hammer2_inode_t *ip;
2118         int error;
2119
2120         LOCKSTART;
2121         ip = VTOI(ap->a_vp);
2122
2123         error = hammer2_ioctl(ip, ap->a_command, (void *)ap->a_data,
2124                               ap->a_fflag, ap->a_cred);
2125         LOCKSTOP;
2126         return (error);
2127 }
2128
2129 static
2130 int
2131 hammer2_vop_mountctl(struct vop_mountctl_args *ap)
2132 {
2133         struct mount *mp;
2134         hammer2_pfs_t *pmp;
2135         int rc;
2136
2137         LOCKSTART;
2138         switch (ap->a_op) {
2139         case (MOUNTCTL_SET_EXPORT):
2140                 mp = ap->a_head.a_ops->head.vv_mount;
2141                 pmp = MPTOPMP(mp);
2142
2143                 if (ap->a_ctllen != sizeof(struct export_args))
2144                         rc = (EINVAL);
2145                 else
2146                         rc = vfs_export(mp, &pmp->export,
2147                                         (const struct export_args *)ap->a_ctl);
2148                 break;
2149         default:
2150                 rc = vop_stdmountctl(ap);
2151                 break;
2152         }
2153         LOCKSTOP;
2154         return (rc);
2155 }
2156
2157 /*
2158  * KQFILTER
2159  */
2160 static void filt_hammer2detach(struct knote *kn);
2161 static int filt_hammer2read(struct knote *kn, long hint);
2162 static int filt_hammer2write(struct knote *kn, long hint);
2163 static int filt_hammer2vnode(struct knote *kn, long hint);
2164
2165 static struct filterops hammer2read_filtops =
2166         { FILTEROP_ISFD | FILTEROP_MPSAFE,
2167           NULL, filt_hammer2detach, filt_hammer2read };
2168 static struct filterops hammer2write_filtops =
2169         { FILTEROP_ISFD | FILTEROP_MPSAFE,
2170           NULL, filt_hammer2detach, filt_hammer2write };
2171 static struct filterops hammer2vnode_filtops =
2172         { FILTEROP_ISFD | FILTEROP_MPSAFE,
2173           NULL, filt_hammer2detach, filt_hammer2vnode };
2174
2175 static
2176 int
2177 hammer2_vop_kqfilter(struct vop_kqfilter_args *ap)
2178 {
2179         struct vnode *vp = ap->a_vp;
2180         struct knote *kn = ap->a_kn;
2181
2182         switch (kn->kn_filter) {
2183         case EVFILT_READ:
2184                 kn->kn_fop = &hammer2read_filtops;
2185                 break;
2186         case EVFILT_WRITE:
2187                 kn->kn_fop = &hammer2write_filtops;
2188                 break;
2189         case EVFILT_VNODE:
2190                 kn->kn_fop = &hammer2vnode_filtops;
2191                 break;
2192         default:
2193                 return (EOPNOTSUPP);
2194         }
2195
2196         kn->kn_hook = (caddr_t)vp;
2197
2198         knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
2199
2200         return(0);
2201 }
2202
2203 static void
2204 filt_hammer2detach(struct knote *kn)
2205 {
2206         struct vnode *vp = (void *)kn->kn_hook;
2207
2208         knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
2209 }
2210
2211 static int
2212 filt_hammer2read(struct knote *kn, long hint)
2213 {
2214         struct vnode *vp = (void *)kn->kn_hook;
2215         hammer2_inode_t *ip = VTOI(vp);
2216         off_t off;
2217
2218         if (hint == NOTE_REVOKE) {
2219                 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT);
2220                 return(1);
2221         }
2222         off = ip->meta.size - kn->kn_fp->f_offset;
2223         kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX;
2224         if (kn->kn_sfflags & NOTE_OLDAPI)
2225                 return(1);
2226         return (kn->kn_data != 0);
2227 }
2228
2229
2230 static int
2231 filt_hammer2write(struct knote *kn, long hint)
2232 {
2233         if (hint == NOTE_REVOKE)
2234                 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT);
2235         kn->kn_data = 0;
2236         return (1);
2237 }
2238
2239 static int
2240 filt_hammer2vnode(struct knote *kn, long hint)
2241 {
2242         if (kn->kn_sfflags & hint)
2243                 kn->kn_fflags |= hint;
2244         if (hint == NOTE_REVOKE) {
2245                 kn->kn_flags |= (EV_EOF | EV_NODATA);
2246                 return (1);
2247         }
2248         return (kn->kn_fflags != 0);
2249 }
2250
2251 /*
2252  * FIFO VOPS
2253  */
2254 static
2255 int
2256 hammer2_vop_markatime(struct vop_markatime_args *ap)
2257 {
2258         hammer2_inode_t *ip;
2259         struct vnode *vp;
2260
2261         vp = ap->a_vp;
2262         ip = VTOI(vp);
2263
2264         if (ip->pmp->ronly)
2265                 return(EROFS);
2266         return(0);
2267 }
2268
2269 static
2270 int
2271 hammer2_vop_fifokqfilter(struct vop_kqfilter_args *ap)
2272 {
2273         int error;
2274
2275         error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2276         if (error)
2277                 error = hammer2_vop_kqfilter(ap);
2278         return(error);
2279 }
2280
2281 /*
2282  * VOPS vector
2283  */
2284 struct vop_ops hammer2_vnode_vops = {
2285         .vop_default    = vop_defaultop,
2286         .vop_fsync      = hammer2_vop_fsync,
2287         .vop_getpages   = vop_stdgetpages,
2288         .vop_putpages   = vop_stdputpages,
2289         .vop_access     = hammer2_vop_access,
2290         .vop_advlock    = hammer2_vop_advlock,
2291         .vop_close      = hammer2_vop_close,
2292         .vop_nlink      = hammer2_vop_nlink,
2293         .vop_ncreate    = hammer2_vop_ncreate,
2294         .vop_nsymlink   = hammer2_vop_nsymlink,
2295         .vop_nremove    = hammer2_vop_nremove,
2296         .vop_nrmdir     = hammer2_vop_nrmdir,
2297         .vop_nrename    = hammer2_vop_nrename,
2298         .vop_getattr    = hammer2_vop_getattr,
2299         .vop_setattr    = hammer2_vop_setattr,
2300         .vop_readdir    = hammer2_vop_readdir,
2301         .vop_readlink   = hammer2_vop_readlink,
2302         .vop_getpages   = vop_stdgetpages,
2303         .vop_putpages   = vop_stdputpages,
2304         .vop_read       = hammer2_vop_read,
2305         .vop_write      = hammer2_vop_write,
2306         .vop_open       = hammer2_vop_open,
2307         .vop_inactive   = hammer2_vop_inactive,
2308         .vop_reclaim    = hammer2_vop_reclaim,
2309         .vop_nresolve   = hammer2_vop_nresolve,
2310         .vop_nlookupdotdot = hammer2_vop_nlookupdotdot,
2311         .vop_nmkdir     = hammer2_vop_nmkdir,
2312         .vop_nmknod     = hammer2_vop_nmknod,
2313         .vop_ioctl      = hammer2_vop_ioctl,
2314         .vop_mountctl   = hammer2_vop_mountctl,
2315         .vop_bmap       = hammer2_vop_bmap,
2316         .vop_strategy   = hammer2_vop_strategy,
2317         .vop_kqfilter   = hammer2_vop_kqfilter
2318 };
2319
2320 struct vop_ops hammer2_spec_vops = {
2321         .vop_default =          vop_defaultop,
2322         .vop_fsync =            hammer2_vop_fsync,
2323         .vop_read =             vop_stdnoread,
2324         .vop_write =            vop_stdnowrite,
2325         .vop_access =           hammer2_vop_access,
2326         .vop_close =            hammer2_vop_close,
2327         .vop_markatime =        hammer2_vop_markatime,
2328         .vop_getattr =          hammer2_vop_getattr,
2329         .vop_inactive =         hammer2_vop_inactive,
2330         .vop_reclaim =          hammer2_vop_reclaim,
2331         .vop_setattr =          hammer2_vop_setattr
2332 };
2333
2334 struct vop_ops hammer2_fifo_vops = {
2335         .vop_default =          fifo_vnoperate,
2336         .vop_fsync =            hammer2_vop_fsync,
2337 #if 0
2338         .vop_read =             hammer2_vop_fiforead,
2339         .vop_write =            hammer2_vop_fifowrite,
2340 #endif
2341         .vop_access =           hammer2_vop_access,
2342 #if 0
2343         .vop_close =            hammer2_vop_fifoclose,
2344 #endif
2345         .vop_markatime =        hammer2_vop_markatime,
2346         .vop_getattr =          hammer2_vop_getattr,
2347         .vop_inactive =         hammer2_vop_inactive,
2348         .vop_reclaim =          hammer2_vop_reclaim,
2349         .vop_setattr =          hammer2_vop_setattr,
2350         .vop_kqfilter =         hammer2_vop_fifokqfilter
2351 };
2352