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         vp = ap->a_vp;
  90         ip = VTOI(vp);
  91
  92         /*
  93          * Degenerate case
  94          */
  95         if (ip == NULL) {
  96                 vrecycle(vp);
  97                 return (0);
  98         }
  99
 100         /*
 101          * Check for deleted inodes and recycle immediately on the last
 102          * release.  Be sure to destroy any left-over buffer cache buffers
 103          * so we do not waste time trying to flush them.
 104          *
 105          * Note that deleting the file block chains under the inode chain
 106          * would just be a waste of energy, so don't do it.
 107          *
 108          * WARNING: nvtruncbuf() can only be safely called without the inode
 109          *          lock held due to the way our write thread works.
 110          */
 111         if (ip->flags & HAMMER2_INODE_ISUNLINKED) {
 112                 hammer2_key_t lbase;
 113                 int nblksize;
 114
 115                 /*
 116                  * Detect updates to the embedded data which may be
 117                  * synchronized by the strategy code.  Simply mark the
 118                  * inode modified so it gets picked up by our normal flush.
 119                  */
 120                 nblksize = hammer2_calc_logical(ip, 0, &lbase, NULL);
 121                 nvtruncbuf(vp, 0, nblksize, 0, 0);
 122                 vrecycle(vp);
 123         }
 124         return (0);
 125 }
 126
 127 /*
 128  * Reclaim a vnode so that it can be reused; after the inode is
 129  * disassociated, the filesystem must manage it alone.
 130  */
 131 static
 132 int
 133 hammer2_vop_reclaim(struct vop_reclaim_args *ap)
 134 {
 135         hammer2_inode_t *ip;
 136         hammer2_pfs_t *pmp;
 137         struct vnode *vp;
 138
 139         vp = ap->a_vp;
 140         ip = VTOI(vp);
 141         if (ip == NULL) {
 142                 return(0);
 143         }
 144         pmp = ip->pmp;
 145
 146         /*
 147          * The final close of a deleted file or directory marks it for
 148          * destruction.  The DELETED flag allows the flusher to shortcut
 149          * any modified blocks still unflushed (that is, just ignore them).
 150          *
 151          * HAMMER2 usually does not try to optimize the freemap by returning
 152          * deleted blocks to it as it does not usually know how many snapshots
 153          * might be referencing portions of the file/dir.
 154          */
 155         vp->v_data = NULL;
 156         ip->vp = NULL;
 157
 158         /*
 159          * NOTE! We do not attempt to flush chains here, flushing is
 160          *       really fragile and could also deadlock.
 161          */
 162         vclrisdirty(vp);
 163
 164         /*
 165          * A modified inode may require chain synchronization.  This
 166          * synchronization is usually handled by VOP_SNYC / VOP_FSYNC
 167          * when vfsync() is called.  However, that requires a vnode.
 168          *
 169          * When the vnode is disassociated we must keep track of any modified
 170          * inode via the sideq so that it is properly flushed.  We cannot
 171          * safely synchronize the inode from inside the reclaim due to
 172          * potentially deep locks held as-of when the reclaim occurs.
 173          * Interactions and potential deadlocks abound.
 174          */
 175         if ((ip->flags & (HAMMER2_INODE_ISUNLINKED |
 176                           HAMMER2_INODE_MODIFIED |
 177                           HAMMER2_INODE_RESIZED)) &&
 178             (ip->flags & HAMMER2_INODE_ISDELETED) == 0) {
 179                 hammer2_inode_sideq_t *ipul;
 180
 181                 ipul = kmalloc(sizeof(*ipul), pmp->minode, M_WAITOK | M_ZERO);
 182                 ipul->ip = ip;
 183
 184                 hammer2_spin_ex(&pmp->list_spin);
 185                 if ((ip->flags & HAMMER2_INODE_ONSIDEQ) == 0) {
 186                         /* ref -> sideq */
 187                         atomic_set_int(&ip->flags, HAMMER2_INODE_ONSIDEQ);
 188                         TAILQ_INSERT_TAIL(&pmp->sideq, ipul, entry);
 189                         ++pmp->sideq_count;
 190                         hammer2_spin_unex(&pmp->list_spin);
 191                 } else {
 192                         hammer2_spin_unex(&pmp->list_spin);
 193                         kfree(ipul, pmp->minode);
 194                         hammer2_inode_drop(ip);         /* vp ref */
 195                 }
 196                 /* retain ref from vp for ipul */
 197         } else {
 198                 hammer2_inode_drop(ip);                 /* vp ref */
 199         }
 200
 201         /*
 202          * XXX handle background sync when ip dirty, kernel will no longer
 203          * notify us regarding this inode because there is no longer a
 204          * vnode attached to it.
 205          */
 206
 207         return (0);
 208 }
 209
 210 static
 211 int
 212 hammer2_vop_fsync(struct vop_fsync_args *ap)
 213 {
 214         hammer2_inode_t *ip;
 215         struct vnode *vp;
 216
 217         vp = ap->a_vp;
 218         ip = VTOI(vp);
 219
 220 #if 0
 221         /* XXX can't do this yet */
 222         hammer2_trans_init(ip->pmp, HAMMER2_TRANS_ISFLUSH);
 223         vfsync(vp, ap->a_waitfor, 1, NULL, NULL);
 224 #endif
 225         hammer2_trans_init(ip->pmp, 0);
 226         vfsync(vp, ap->a_waitfor, 1, NULL, NULL);
 227
 228         /*
 229          * Calling chain_flush here creates a lot of duplicative
 230          * COW operations due to non-optimal vnode ordering.
 231          *
 232          * Only do it for an actual fsync() syscall.  The other forms
 233          * which call this function will eventually call chain_flush
 234          * on the volume root as a catch-all, which is far more optimal.
 235          */
 236         hammer2_inode_lock(ip, 0);
 237         if (ip->flags & HAMMER2_INODE_MODIFIED)
 238                 hammer2_inode_chain_sync(ip);
 239         hammer2_inode_unlock(ip);
 240         hammer2_trans_done(ip->pmp);
 241
 242         return (0);
 243 }
 244
 245 static
 246 int
 247 hammer2_vop_access(struct vop_access_args *ap)
 248 {
 249         hammer2_inode_t *ip = VTOI(ap->a_vp);
 250         uid_t uid;
 251         gid_t gid;
 252         int error;
 253
 254         hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
 255         uid = hammer2_to_unix_xid(&ip->meta.uid);
 256         gid = hammer2_to_unix_xid(&ip->meta.gid);
 257         error = vop_helper_access(ap, uid, gid, ip->meta.mode, ip->meta.uflags);
 258         hammer2_inode_unlock(ip);
 259
 260         return (error);
 261 }
 262
 263 static
 264 int
 265 hammer2_vop_getattr(struct vop_getattr_args *ap)
 266 {
 267         hammer2_pfs_t *pmp;
 268         hammer2_inode_t *ip;
 269         struct vnode *vp;
 270         struct vattr *vap;
 271         hammer2_chain_t *chain;
 272         int i;
 273
 274         vp = ap->a_vp;
 275         vap = ap->a_vap;
 276
 277         ip = VTOI(vp);
 278         pmp = ip->pmp;
 279
 280         hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
 281
 282         vap->va_fsid = pmp->mp->mnt_stat.f_fsid.val[0];
 283         vap->va_fileid = ip->meta.inum;
 284         vap->va_mode = ip->meta.mode;
 285         vap->va_nlink = ip->meta.nlinks;
 286         vap->va_uid = hammer2_to_unix_xid(&ip->meta.uid);
 287         vap->va_gid = hammer2_to_unix_xid(&ip->meta.gid);
 288         vap->va_rmajor = 0;
 289         vap->va_rminor = 0;
 290         vap->va_size = ip->meta.size;   /* protected by shared lock */
 291         vap->va_blocksize = HAMMER2_PBUFSIZE;
 292         vap->va_flags = ip->meta.uflags;
 293         hammer2_time_to_timespec(ip->meta.ctime, &vap->va_ctime);
 294         hammer2_time_to_timespec(ip->meta.mtime, &vap->va_mtime);
 295         hammer2_time_to_timespec(ip->meta.mtime, &vap->va_atime);
 296         vap->va_gen = 1;
 297         vap->va_bytes = 0;
 298         if (ip->meta.type == HAMMER2_OBJTYPE_DIRECTORY) {
 299                 /*
 300                  * Can't really calculate directory use sans the files under
 301                  * it, just assume one block for now.
 302                  */
 303                 vap->va_bytes += HAMMER2_INODE_BYTES;
 304         } else {
 305                 for (i = 0; i < ip->cluster.nchains; ++i) {
 306                         if ((chain = ip->cluster.array[i].chain) != NULL) {
 307                                 if (vap->va_bytes <
 308                                     chain->bref.embed.stats.data_count) {
 309                                         vap->va_bytes =
 310                                             chain->bref.embed.stats.data_count;
 311                                 }
 312                         }
 313                 }
 314         }
 315         vap->va_type = hammer2_get_vtype(ip->meta.type);
 316         vap->va_filerev = 0;
 317         vap->va_uid_uuid = ip->meta.uid;
 318         vap->va_gid_uuid = ip->meta.gid;
 319         vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID |
 320                           VA_FSID_UUID_VALID;
 321
 322         hammer2_inode_unlock(ip);
 323
 324         return (0);
 325 }
 326
 327 static
 328 int
 329 hammer2_vop_setattr(struct vop_setattr_args *ap)
 330 {
 331         hammer2_inode_t *ip;
 332         struct vnode *vp;
 333         struct vattr *vap;
 334         int error;
 335         int kflags = 0;
 336         uint64_t ctime;
 337
 338         vp = ap->a_vp;
 339         vap = ap->a_vap;
 340         hammer2_update_time(&ctime);
 341
 342         ip = VTOI(vp);
 343
 344         if (ip->pmp->ronly)
 345                 return (EROFS);
 346         if (hammer2_vfs_enospace(ip, 0, ap->a_cred) > 1)
 347                 return (ENOSPC);
 348
 349         hammer2_pfs_memory_wait(ip->pmp);
 350         hammer2_trans_init(ip->pmp, 0);
 351         hammer2_inode_lock(ip, 0);
 352         error = 0;
 353
 354         if (vap->va_flags != VNOVAL) {
 355                 uint32_t flags;
 356
 357                 flags = ip->meta.uflags;
 358                 error = vop_helper_setattr_flags(&flags, vap->va_flags,
 359                                      hammer2_to_unix_xid(&ip->meta.uid),
 360                                      ap->a_cred);
 361                 if (error == 0) {
 362                         if (ip->meta.uflags != flags) {
 363                                 hammer2_inode_modify(ip);
 364                                 ip->meta.uflags = flags;
 365                                 ip->meta.ctime = ctime;
 366                                 kflags |= NOTE_ATTRIB;
 367                         }
 368                         if (ip->meta.uflags & (IMMUTABLE | APPEND)) {
 369                                 error = 0;
 370                                 goto done;
 371                         }
 372                 }
 373                 goto done;
 374         }
 375         if (ip->meta.uflags & (IMMUTABLE | APPEND)) {
 376                 error = EPERM;
 377                 goto done;
 378         }
 379         if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
 380                 mode_t cur_mode = ip->meta.mode;
 381                 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid);
 382                 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid);
 383                 uuid_t uuid_uid;
 384                 uuid_t uuid_gid;
 385
 386                 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid,
 387                                          ap->a_cred,
 388                                          &cur_uid, &cur_gid, &cur_mode);
 389                 if (error == 0) {
 390                         hammer2_guid_to_uuid(&uuid_uid, cur_uid);
 391                         hammer2_guid_to_uuid(&uuid_gid, cur_gid);
 392                         if (bcmp(&uuid_uid, &ip->meta.uid, sizeof(uuid_uid)) ||
 393                             bcmp(&uuid_gid, &ip->meta.gid, sizeof(uuid_gid)) ||
 394                             ip->meta.mode != cur_mode
 395                         ) {
 396                                 hammer2_inode_modify(ip);
 397                                 ip->meta.uid = uuid_uid;
 398                                 ip->meta.gid = uuid_gid;
 399                                 ip->meta.mode = cur_mode;
 400                                 ip->meta.ctime = ctime;
 401                         }
 402                         kflags |= NOTE_ATTRIB;
 403                 }
 404         }
 405
 406         /*
 407          * Resize the file
 408          */
 409         if (vap->va_size != VNOVAL && ip->meta.size != vap->va_size) {
 410                 switch(vp->v_type) {
 411                 case VREG:
 412                         if (vap->va_size == ip->meta.size)
 413                                 break;
 414                         if (vap->va_size < ip->meta.size) {
 415                                 hammer2_mtx_ex(&ip->truncate_lock);
 416                                 hammer2_truncate_file(ip, vap->va_size);
 417                                 hammer2_mtx_unlock(&ip->truncate_lock);
 418                                 kflags |= NOTE_WRITE;
 419                         } else {
 420                                 hammer2_extend_file(ip, vap->va_size);
 421                                 kflags |= NOTE_WRITE | NOTE_EXTEND;
 422                         }
 423                         hammer2_inode_modify(ip);
 424                         ip->meta.mtime = ctime;
 425                         break;
 426                 default:
 427                         error = EINVAL;
 428                         goto done;
 429                 }
 430         }
 431 #if 0
 432         /* atime not supported */
 433         if (vap->va_atime.tv_sec != VNOVAL) {
 434                 hammer2_inode_modify(ip);
 435                 ip->meta.atime = hammer2_timespec_to_time(&vap->va_atime);
 436                 kflags |= NOTE_ATTRIB;
 437         }
 438 #endif
 439         if (vap->va_mode != (mode_t)VNOVAL) {
 440                 mode_t cur_mode = ip->meta.mode;
 441                 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid);
 442                 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid);
 443
 444                 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred,
 445                                          cur_uid, cur_gid, &cur_mode);
 446                 if (error == 0 && ip->meta.mode != cur_mode) {
 447                         hammer2_inode_modify(ip);
 448                         ip->meta.mode = cur_mode;
 449                         ip->meta.ctime = ctime;
 450                         kflags |= NOTE_ATTRIB;
 451                 }
 452         }
 453
 454         if (vap->va_mtime.tv_sec != VNOVAL) {
 455                 hammer2_inode_modify(ip);
 456                 ip->meta.mtime = hammer2_timespec_to_time(&vap->va_mtime);
 457                 kflags |= NOTE_ATTRIB;
 458         }
 459
 460 done:
 461         /*
 462          * If a truncation occurred we must call inode_fsync() now in order
 463          * to trim the related data chains, otherwise a later expansion can
 464          * cause havoc.
 465          *
 466          * If an extend occured that changed the DIRECTDATA state, we must
 467          * call inode_fsync now in order to prepare the inode's indirect
 468          * block table.
 469          */
 470         if (ip->flags & HAMMER2_INODE_RESIZED)
 471                 hammer2_inode_chain_sync(ip);
 472
 473         /*
 474          * Cleanup.
 475          */
 476         hammer2_inode_unlock(ip);
 477         hammer2_trans_done(ip->pmp);
 478         hammer2_knote(ip->vp, kflags);
 479
 480         return (error);
 481 }
 482
 483 static
 484 int
 485 hammer2_vop_readdir(struct vop_readdir_args *ap)
 486 {
 487         hammer2_xop_readdir_t *xop;
 488         hammer2_blockref_t bref;
 489         hammer2_inode_t *ip;
 490         hammer2_tid_t inum;
 491         hammer2_key_t lkey;
 492         struct uio *uio;
 493         off_t *cookies;
 494         off_t saveoff;
 495         int cookie_index;
 496         int ncookies;
 497         int error;
 498         int eofflag;
 499         int r;
 500
 501         ip = VTOI(ap->a_vp);
 502         uio = ap->a_uio;
 503         saveoff = uio->uio_offset;
 504         eofflag = 0;
 505         error = 0;
 506
 507         /*
 508          * Setup cookies directory entry cookies if requested
 509          */
 510         if (ap->a_ncookies) {
 511                 ncookies = uio->uio_resid / 16 + 1;
 512                 if (ncookies > 1024)
 513                         ncookies = 1024;
 514                 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
 515         } else {
 516                 ncookies = -1;
 517                 cookies = NULL;
 518         }
 519         cookie_index = 0;
 520
 521         hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
 522
 523         /*
 524          * Handle artificial entries.  To ensure that only positive 64 bit
 525          * quantities are returned to userland we always strip off bit 63.
 526          * The hash code is designed such that codes 0x0000-0x7FFF are not
 527          * used, allowing us to use these codes for articial entries.
 528          *
 529          * Entry 0 is used for '.' and entry 1 is used for '..'.  Do not
 530          * allow '..' to cross the mount point into (e.g.) the super-root.
 531          */
 532         if (saveoff == 0) {
 533                 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK;
 534                 r = vop_write_dirent(&error, uio, inum, DT_DIR, 1, ".");
 535                 if (r)
 536                         goto done;
 537                 if (cookies)
 538                         cookies[cookie_index] = saveoff;
 539                 ++saveoff;
 540                 ++cookie_index;
 541                 if (cookie_index == ncookies)
 542                         goto done;
 543         }
 544
 545         if (saveoff == 1) {
 546                 /*
 547                  * Be careful with lockorder when accessing ".."
 548                  *
 549                  * (ip is the current dir. xip is the parent dir).
 550                  */
 551                 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK;
 552                 if (ip != ip->pmp->iroot)
 553                         inum = ip->meta.iparent & HAMMER2_DIRHASH_USERMSK;
 554                 r = vop_write_dirent(&error, uio, inum, DT_DIR, 2, "..");
 555                 if (r)
 556                         goto done;
 557                 if (cookies)
 558                         cookies[cookie_index] = saveoff;
 559                 ++saveoff;
 560                 ++cookie_index;
 561                 if (cookie_index == ncookies)
 562                         goto done;
 563         }
 564
 565         lkey = saveoff | HAMMER2_DIRHASH_VISIBLE;
 566         if (hammer2_debug & 0x0020)
 567                 kprintf("readdir: lkey %016jx\n", lkey);
 568         if (error)
 569                 goto done;
 570
 571         /*
 572          * Use XOP for cluster scan.
 573          *
 574          * parent is the inode cluster, already locked for us.  Don't
 575          * double lock shared locks as this will screw up upgrades.
 576          */
 577         xop = hammer2_xop_alloc(ip, 0);
 578         xop->lkey = lkey;
 579         hammer2_xop_start(&xop->head, hammer2_xop_readdir);
 580
 581         for (;;) {
 582                 const hammer2_inode_data_t *ripdata;
 583                 const char *dname;
 584                 int dtype;
 585
 586                 error = hammer2_xop_collect(&xop->head, 0);
 587                 error = hammer2_error_to_errno(error);
 588                 if (error) {
 589                         break;
 590                 }
 591                 if (cookie_index == ncookies)
 592                         break;
 593                 if (hammer2_debug & 0x0020)
 594                 kprintf("cluster chain %p %p\n",
 595                         xop->head.cluster.focus,
 596                         (xop->head.cluster.focus ?
 597                          xop->head.cluster.focus->data : (void *)-1));
 598                 hammer2_cluster_bref(&xop->head.cluster, &bref);
 599
 600                 if (bref.type == HAMMER2_BREF_TYPE_INODE) {
 601                         ripdata =
 602                             &hammer2_cluster_rdata(&xop->head.cluster)->ipdata;
 603                         dtype = hammer2_get_dtype(ripdata->meta.type);
 604                         saveoff = bref.key & HAMMER2_DIRHASH_USERMSK;
 605                         r = vop_write_dirent(&error, uio,
 606                                              ripdata->meta.inum &
 607                                               HAMMER2_DIRHASH_USERMSK,
 608                                              dtype,
 609                                              ripdata->meta.name_len,
 610                                              ripdata->filename);
 611                         if (r)
 612                                 break;
 613                         if (cookies)
 614                                 cookies[cookie_index] = saveoff;
 615                         ++cookie_index;
 616                 } else if (bref.type == HAMMER2_BREF_TYPE_DIRENT) {
 617                         dtype = hammer2_get_dtype(bref.embed.dirent.type);
 618                         saveoff = bref.key & HAMMER2_DIRHASH_USERMSK;
 619                         if (bref.embed.dirent.namlen <=
 620                             sizeof(bref.check.buf)) {
 621                                 dname = bref.check.buf;
 622                         } else {
 623                                 dname =
 624                                  hammer2_cluster_rdata(&xop->head.cluster)->buf;
 625                         }
 626                         r = vop_write_dirent(&error, uio,
 627                                              bref.embed.dirent.inum,
 628                                              dtype,
 629                                              bref.embed.dirent.namlen,
 630                                              dname);
 631                         if (r)
 632                                 break;
 633                         if (cookies)
 634                                 cookies[cookie_index] = saveoff;
 635                         ++cookie_index;
 636                 } else {
 637                         /* XXX chain error */
 638                         kprintf("bad chain type readdir %d\n", bref.type);
 639                 }
 640         }
 641         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
 642         if (error == ENOENT) {
 643                 error = 0;
 644                 eofflag = 1;
 645                 saveoff = (hammer2_key_t)-1;
 646         } else {
 647                 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK;
 648         }
 649 done:
 650         hammer2_inode_unlock(ip);
 651         if (ap->a_eofflag)
 652                 *ap->a_eofflag = eofflag;
 653         if (hammer2_debug & 0x0020)
 654                 kprintf("readdir: done at %016jx\n", saveoff);
 655         uio->uio_offset = saveoff & ~HAMMER2_DIRHASH_VISIBLE;
 656         if (error && cookie_index == 0) {
 657                 if (cookies) {
 658                         kfree(cookies, M_TEMP);
 659                         *ap->a_ncookies = 0;
 660                         *ap->a_cookies = NULL;
 661                 }
 662         } else {
 663                 if (cookies) {
 664                         *ap->a_ncookies = cookie_index;
 665                         *ap->a_cookies = cookies;
 666                 }
 667         }
 668         return (error);
 669 }
 670
 671 /*
 672  * hammer2_vop_readlink { vp, uio, cred }
 673  */
 674 static
 675 int
 676 hammer2_vop_readlink(struct vop_readlink_args *ap)
 677 {
 678         struct vnode *vp;
 679         hammer2_inode_t *ip;
 680         int error;
 681
 682         vp = ap->a_vp;
 683         if (vp->v_type != VLNK)
 684                 return (EINVAL);
 685         ip = VTOI(vp);
 686
 687         error = hammer2_read_file(ip, ap->a_uio, 0);
 688         return (error);
 689 }
 690
 691 static
 692 int
 693 hammer2_vop_read(struct vop_read_args *ap)
 694 {
 695         struct vnode *vp;
 696         hammer2_inode_t *ip;
 697         struct uio *uio;
 698         int error;
 699         int seqcount;
 700         int bigread;
 701
 702         /*
 703          * Read operations supported on this vnode?
 704          */
 705         vp = ap->a_vp;
 706         if (vp->v_type != VREG)
 707                 return (EINVAL);
 708
 709         /*
 710          * Misc
 711          */
 712         ip = VTOI(vp);
 713         uio = ap->a_uio;
 714         error = 0;
 715
 716         seqcount = ap->a_ioflag >> 16;
 717         bigread = (uio->uio_resid > 100 * 1024 * 1024);
 718
 719         error = hammer2_read_file(ip, uio, seqcount);
 720         return (error);
 721 }
 722
 723 static
 724 int
 725 hammer2_vop_write(struct vop_write_args *ap)
 726 {
 727         hammer2_inode_t *ip;
 728         thread_t td;
 729         struct vnode *vp;
 730         struct uio *uio;
 731         int error;
 732         int seqcount;
 733         int ioflag;
 734
 735         /*
 736          * Read operations supported on this vnode?
 737          */
 738         vp = ap->a_vp;
 739         if (vp->v_type != VREG)
 740                 return (EINVAL);
 741
 742         /*
 743          * Misc
 744          */
 745         ip = VTOI(vp);
 746         ioflag = ap->a_ioflag;
 747         uio = ap->a_uio;
 748         error = 0;
 749         if (ip->pmp->ronly)
 750                 return (EROFS);
 751         switch (hammer2_vfs_enospace(ip, uio->uio_resid, ap->a_cred)) {
 752         case 2:
 753                 return (ENOSPC);
 754         case 1:
 755                 ioflag |= IO_DIRECT;    /* semi-synchronous */
 756                 /* fall through */
 757         default:
 758                 break;
 759         }
 760
 761         seqcount = ioflag >> 16;
 762
 763         /*
 764          * Check resource limit
 765          */
 766         if (uio->uio_resid > 0 && (td = uio->uio_td) != NULL && td->td_proc &&
 767             uio->uio_offset + uio->uio_resid >
 768              td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
 769                 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ);
 770                 return (EFBIG);
 771         }
 772
 773         /*
 774          * The transaction interlocks against flush initiations
 775          * (note: but will run concurrently with the actual flush).
 776          *
 777          * To avoid deadlocking against the VM system, we must flag any
 778          * transaction related to the buffer cache or other direct
 779          * VM page manipulation.
 780          */
 781         if (uio->uio_segflg == UIO_NOCOPY)
 782                 hammer2_trans_init(ip->pmp, HAMMER2_TRANS_BUFCACHE);
 783         else
 784                 hammer2_trans_init(ip->pmp, 0);
 785         error = hammer2_write_file(ip, uio, ioflag, seqcount);
 786         hammer2_trans_done(ip->pmp);
 787
 788         return (error);
 789 }
 790
 791 /*
 792  * Perform read operations on a file or symlink given an UNLOCKED
 793  * inode and uio.
 794  *
 795  * The passed ip is not locked.
 796  */
 797 static
 798 int
 799 hammer2_read_file(hammer2_inode_t *ip, struct uio *uio, int seqcount)
 800 {
 801         hammer2_off_t size;
 802         struct buf *bp;
 803         int error;
 804
 805         error = 0;
 806
 807         /*
 808          * UIO read loop.
 809          *
 810          * WARNING! Assumes that the kernel interlocks size changes at the
 811          *          vnode level.
 812          */
 813         hammer2_mtx_sh(&ip->lock);
 814         hammer2_mtx_sh(&ip->truncate_lock);
 815         size = ip->meta.size;
 816         hammer2_mtx_unlock(&ip->lock);
 817
 818         while (uio->uio_resid > 0 && uio->uio_offset < size) {
 819                 hammer2_key_t lbase;
 820                 hammer2_key_t leof;
 821                 int lblksize;
 822                 int loff;
 823                 int n;
 824
 825                 lblksize = hammer2_calc_logical(ip, uio->uio_offset,
 826                                                 &lbase, &leof);
 827
 828 #if 1
 829                 bp = NULL;
 830                 error = cluster_readx(ip->vp, leof, lbase, lblksize,
 831                                       B_NOTMETA | B_KVABIO,
 832                                       uio->uio_resid,
 833                                       seqcount * MAXBSIZE,
 834                                       &bp);
 835 #else
 836                 if (uio->uio_segflg == UIO_NOCOPY) {
 837                         bp = getblk(ip->vp, lbase, lblksize,
 838                                     GETBLK_BHEAVY | GETBLK_KVABIO, 0);
 839                         if (bp->b_flags & B_CACHE) {
 840                                 int i;
 841                                 int j = 0;
 842                                 if (bp->b_xio.xio_npages != 16)
 843                                         kprintf("NPAGES BAD\n");
 844                                 for (i = 0; i < bp->b_xio.xio_npages; ++i) {
 845                                         vm_page_t m;
 846                                         m = bp->b_xio.xio_pages[i];
 847                                         if (m == NULL || m->valid == 0) {
 848                                                 kprintf("bp %016jx %016jx pg %d inv",
 849                                                         lbase, leof, i);
 850                                                 if (m)
 851                                                         kprintf("m->object %p/%p", m->object, ip->vp->v_object);
 852                                                 kprintf("\n");
 853                                                 j = 1;
 854                                         }
 855                                 }
 856                                 if (j)
 857                                         kprintf("b_flags %08x, b_error %d\n", bp->b_flags, bp->b_error);
 858                         }
 859                         bqrelse(bp);
 860                 }
 861                 error = bread_kvabio(ip->vp, lbase, lblksize, &bp);
 862 #endif
 863                 if (error) {
 864                         brelse(bp);
 865                         break;
 866                 }
 867                 bkvasync(bp);
 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,
 996                                     GETBLK_BHEAVY | GETBLK_KVABIO, 0);
 997                         if ((bp->b_flags & B_CACHE) == 0) {
 998                                 bqrelse(bp);
 999                                 error = bread_kvabio(ip->vp, lbase,
1000                                                      lblksize, &bp);
1001                         }
1002                 } else if (trivial) {
1003                         /*
1004                          * Even though we are entirely overwriting the buffer
1005                          * we may still have to zero it out to avoid a
1006                          * mmap/write visibility issue.
1007                          */
1008                         bp = getblk(ip->vp, lbase, lblksize,
1009                                     GETBLK_BHEAVY | GETBLK_KVABIO, 0);
1010                         if ((bp->b_flags & B_CACHE) == 0)
1011                                 vfs_bio_clrbuf(bp);
1012                 } else {
1013                         /*
1014                          * Partial overwrite, read in any missing bits then
1015                          * replace the portion being written.
1016                          *
1017                          * (The strategy code will detect zero-fill physical
1018                          * blocks for this case).
1019                          */
1020                         error = bread_kvabio(ip->vp, lbase, lblksize, &bp);
1021                         if (error == 0)
1022                                 bheavy(bp);
1023                 }
1024
1025                 if (error) {
1026                         brelse(bp);
1027                         break;
1028                 }
1029
1030                 /*
1031                  * Ok, copy the data in
1032                  */
1033                 bkvasync(bp);
1034                 error = uiomovebp(bp, bp->b_data + loff, n, uio);
1035                 kflags |= NOTE_WRITE;
1036                 modified = 1;
1037                 if (error) {
1038                         brelse(bp);
1039                         break;
1040                 }
1041
1042                 /*
1043                  * WARNING: Pageout daemon will issue UIO_NOCOPY writes
1044                  *          with IO_SYNC or IO_ASYNC set.  These writes
1045                  *          must be handled as the pageout daemon expects.
1046                  *
1047                  * NOTE!    H2 relies on cluster_write() here because it
1048                  *          cannot preallocate disk blocks at the logical
1049                  *          level due to not knowing what the compression
1050                  *          size will be at this time.
1051                  *
1052                  *          We must use cluster_write() here and we depend
1053                  *          on the write-behind feature to flush buffers
1054                  *          appropriately.  If we let the buffer daemons do
1055                  *          it the block allocations will be all over the
1056                  *          map.
1057                  */
1058                 if (ioflag & IO_SYNC) {
1059                         bwrite(bp);
1060                 } else if ((ioflag & IO_DIRECT) && endofblk) {
1061                         bawrite(bp);
1062                 } else if (ioflag & IO_ASYNC) {
1063                         bawrite(bp);
1064                 } else if (ip->vp->v_mount->mnt_flag & MNT_NOCLUSTERW) {
1065                         bdwrite(bp);
1066                 } else {
1067 #if 1
1068                         bp->b_flags |= B_CLUSTEROK;
1069                         cluster_write(bp, new_eof, lblksize, seqcount);
1070 #else
1071                         bp->b_flags |= B_CLUSTEROK;
1072                         bdwrite(bp);
1073 #endif
1074                 }
1075         }
1076
1077         /*
1078          * Cleanup.  If we extended the file EOF but failed to write through
1079          * the entire write is a failure and we have to back-up.
1080          */
1081         if (error && new_eof != old_eof) {
1082                 hammer2_mtx_unlock(&ip->truncate_lock);
1083                 hammer2_mtx_ex(&ip->lock);
1084                 hammer2_mtx_ex(&ip->truncate_lock);
1085                 hammer2_truncate_file(ip, old_eof);
1086                 if (ip->flags & HAMMER2_INODE_MODIFIED)
1087                         hammer2_inode_chain_sync(ip);
1088                 hammer2_mtx_unlock(&ip->lock);
1089         } else if (modified) {
1090                 hammer2_mtx_ex(&ip->lock);
1091                 hammer2_inode_modify(ip);
1092                 hammer2_update_time(&ip->meta.mtime);
1093                 if (ip->flags & HAMMER2_INODE_MODIFIED)
1094                         hammer2_inode_chain_sync(ip);
1095                 hammer2_mtx_unlock(&ip->lock);
1096                 hammer2_knote(ip->vp, kflags);
1097         }
1098         hammer2_trans_assert_strategy(ip->pmp);
1099         hammer2_mtx_unlock(&ip->truncate_lock);
1100
1101         return error;
1102 }
1103
1104 /*
1105  * Truncate the size of a file.  The inode must not be locked.
1106  *
1107  * We must unconditionally set HAMMER2_INODE_RESIZED to properly
1108  * ensure that any on-media data beyond the new file EOF has been destroyed.
1109  *
1110  * WARNING: nvtruncbuf() can only be safely called without the inode lock
1111  *          held due to the way our write thread works.  If the truncation
1112  *          occurs in the middle of a buffer, nvtruncbuf() is responsible
1113  *          for dirtying that buffer and zeroing out trailing bytes.
1114  *
1115  * WARNING! Assumes that the kernel interlocks size changes at the
1116  *          vnode level.
1117  *
1118  * WARNING! Caller assumes responsibility for removing dead blocks
1119  *          if INODE_RESIZED is set.
1120  */
1121 static
1122 void
1123 hammer2_truncate_file(hammer2_inode_t *ip, hammer2_key_t nsize)
1124 {
1125         hammer2_key_t lbase;
1126         int nblksize;
1127
1128         hammer2_mtx_unlock(&ip->lock);
1129         if (ip->vp) {
1130                 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL);
1131                 nvtruncbuf(ip->vp, nsize,
1132                            nblksize, (int)nsize & (nblksize - 1),
1133                            0);
1134         }
1135         hammer2_mtx_ex(&ip->lock);
1136         KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0);
1137         ip->osize = ip->meta.size;
1138         ip->meta.size = nsize;
1139         atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED);
1140         hammer2_inode_modify(ip);
1141 }
1142
1143 /*
1144  * Extend the size of a file.  The inode must not be locked.
1145  *
1146  * Even though the file size is changing, we do not have to set the
1147  * INODE_RESIZED bit unless the file size crosses the EMBEDDED_BYTES
1148  * boundary.  When this occurs a hammer2_inode_chain_sync() is required
1149  * to prepare the inode cluster's indirect block table, otherwise
1150  * async execution of the strategy code will implode on us.
1151  *
1152  * WARNING! Assumes that the kernel interlocks size changes at the
1153  *          vnode level.
1154  *
1155  * WARNING! Caller assumes responsibility for transitioning out
1156  *          of the inode DIRECTDATA mode if INODE_RESIZED is set.
1157  */
1158 static
1159 void
1160 hammer2_extend_file(hammer2_inode_t *ip, hammer2_key_t nsize)
1161 {
1162         hammer2_key_t lbase;
1163         hammer2_key_t osize;
1164         int oblksize;
1165         int nblksize;
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
1190 static
1191 int
1192 hammer2_vop_nresolve(struct vop_nresolve_args *ap)
1193 {
1194         hammer2_xop_nresolve_t *xop;
1195         hammer2_inode_t *ip;
1196         hammer2_inode_t *dip;
1197         struct namecache *ncp;
1198         struct vnode *vp;
1199         int error;
1200
1201         dip = VTOI(ap->a_dvp);
1202         xop = hammer2_xop_alloc(dip, 0);
1203
1204         ncp = ap->a_nch->ncp;
1205         hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen);
1206
1207         /*
1208          * Note: In DragonFly the kernel handles '.' and '..'.
1209          */
1210         hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1211         hammer2_xop_start(&xop->head, hammer2_xop_nresolve);
1212
1213         error = hammer2_xop_collect(&xop->head, 0);
1214         error = hammer2_error_to_errno(error);
1215         if (error) {
1216                 ip = NULL;
1217         } else {
1218                 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1);
1219         }
1220         hammer2_inode_unlock(dip);
1221
1222         /*
1223          * Acquire the related vnode
1224          *
1225          * NOTE: For error processing, only ENOENT resolves the namecache
1226          *       entry to NULL, otherwise we just return the error and
1227          *       leave the namecache unresolved.
1228          *
1229          * NOTE: multiple hammer2_inode structures can be aliased to the
1230          *       same chain element, for example for hardlinks.  This
1231          *       use case does not 'reattach' inode associations that
1232          *       might already exist, but always allocates a new one.
1233          *
1234          * WARNING: inode structure is locked exclusively via inode_get
1235          *          but chain was locked shared.  inode_unlock()
1236          *          will handle it properly.
1237          */
1238         if (ip) {
1239                 vp = hammer2_igetv(ip, &error); /* error set to UNIX error */
1240                 if (error == 0) {
1241                         vn_unlock(vp);
1242                         cache_setvp(ap->a_nch, vp);
1243                 } else if (error == ENOENT) {
1244                         cache_setvp(ap->a_nch, NULL);
1245                 }
1246                 hammer2_inode_unlock(ip);
1247
1248                 /*
1249                  * The vp should not be released until after we've disposed
1250                  * of our locks, because it might cause vop_inactive() to
1251                  * be called.
1252                  */
1253                 if (vp)
1254                         vrele(vp);
1255         } else {
1256                 error = ENOENT;
1257                 cache_setvp(ap->a_nch, NULL);
1258         }
1259         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1260         KASSERT(error || ap->a_nch->ncp->nc_vp != NULL,
1261                 ("resolve error %d/%p ap %p\n",
1262                  error, ap->a_nch->ncp->nc_vp, ap));
1263
1264         return error;
1265 }
1266
1267 static
1268 int
1269 hammer2_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
1270 {
1271         hammer2_inode_t *dip;
1272         hammer2_tid_t inum;
1273         int error;
1274
1275         dip = VTOI(ap->a_dvp);
1276         inum = dip->meta.iparent;
1277         *ap->a_vpp = NULL;
1278
1279         if (inum) {
1280                 error = hammer2_vfs_vget(ap->a_dvp->v_mount, NULL,
1281                                          inum, ap->a_vpp);
1282         } else {
1283                 error = ENOENT;
1284         }
1285         return error;
1286 }
1287
1288 static
1289 int
1290 hammer2_vop_nmkdir(struct vop_nmkdir_args *ap)
1291 {
1292         hammer2_inode_t *dip;
1293         hammer2_inode_t *nip;
1294         struct namecache *ncp;
1295         const uint8_t *name;
1296         size_t name_len;
1297         hammer2_tid_t inum;
1298         int error;
1299
1300         dip = VTOI(ap->a_dvp);
1301         if (dip->pmp->ronly)
1302                 return (EROFS);
1303         if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1)
1304                 return (ENOSPC);
1305
1306         ncp = ap->a_nch->ncp;
1307         name = ncp->nc_name;
1308         name_len = ncp->nc_nlen;
1309
1310         hammer2_pfs_memory_wait(dip->pmp);
1311         hammer2_trans_init(dip->pmp, 0);
1312
1313         inum = hammer2_trans_newinum(dip->pmp);
1314
1315         /*
1316          * Create the actual inode as a hidden file in the iroot, then
1317          * create the directory entry.  The creation of the actual inode
1318          * sets its nlinks to 1 which is the value we desire.
1319          */
1320         nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred,
1321                                    NULL, 0, inum,
1322                                    inum, 0, 0,
1323                                    0, &error);
1324         if (error) {
1325                 error = hammer2_error_to_errno(error);
1326         } else {
1327                 error = hammer2_dirent_create(dip, name, name_len,
1328                                               nip->meta.inum, nip->meta.type);
1329                 /* returns UNIX error code */
1330         }
1331         if (error) {
1332                 if (nip) {
1333                         hammer2_inode_unlink_finisher(nip, 0);
1334                         hammer2_inode_unlock(nip);
1335                         nip = NULL;
1336                 }
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          * We can use a shared inode lock and allow the meta.mtime update
1347          * SMP race.  hammer2_inode_modify() is MPSAFE w/a shared lock.
1348          */
1349         if (error == 0) {
1350                 uint64_t mtime;
1351
1352                 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1353                 hammer2_update_time(&mtime);
1354                 hammer2_inode_modify(dip);
1355                 dip->meta.mtime = mtime;
1356                 hammer2_inode_unlock(dip);
1357         }
1358
1359         hammer2_trans_done(dip->pmp);
1360
1361         if (error == 0) {
1362                 cache_setunresolved(ap->a_nch);
1363                 cache_setvp(ap->a_nch, *ap->a_vpp);
1364                 hammer2_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
1365         }
1366         return error;
1367 }
1368
1369 static
1370 int
1371 hammer2_vop_open(struct vop_open_args *ap)
1372 {
1373         return vop_stdopen(ap);
1374 }
1375
1376 /*
1377  * hammer2_vop_advlock { vp, id, op, fl, flags }
1378  */
1379 static
1380 int
1381 hammer2_vop_advlock(struct vop_advlock_args *ap)
1382 {
1383         hammer2_inode_t *ip = VTOI(ap->a_vp);
1384         hammer2_off_t size;
1385
1386         size = ip->meta.size;
1387         return (lf_advlock(ap, &ip->advlock, size));
1388 }
1389
1390 static
1391 int
1392 hammer2_vop_close(struct vop_close_args *ap)
1393 {
1394         return vop_stdclose(ap);
1395 }
1396
1397 /*
1398  * hammer2_vop_nlink { nch, dvp, vp, cred }
1399  *
1400  * Create a hardlink from (vp) to {dvp, nch}.
1401  */
1402 static
1403 int
1404 hammer2_vop_nlink(struct vop_nlink_args *ap)
1405 {
1406         hammer2_inode_t *tdip;  /* target directory to create link in */
1407         hammer2_inode_t *ip;    /* inode we are hardlinking to */
1408         struct namecache *ncp;
1409         const uint8_t *name;
1410         size_t name_len;
1411         int error;
1412
1413         if (ap->a_dvp->v_mount != ap->a_vp->v_mount)
1414                 return(EXDEV);
1415
1416         tdip = VTOI(ap->a_dvp);
1417         if (tdip->pmp->ronly)
1418                 return (EROFS);
1419         if (hammer2_vfs_enospace(tdip, 0, ap->a_cred) > 1)
1420                 return (ENOSPC);
1421
1422         ncp = ap->a_nch->ncp;
1423         name = ncp->nc_name;
1424         name_len = ncp->nc_nlen;
1425
1426         /*
1427          * ip represents the file being hardlinked.  The file could be a
1428          * normal file or a hardlink target if it has already been hardlinked.
1429          * (with the new semantics, it will almost always be a hardlink
1430          * target).
1431          *
1432          * Bump nlinks and potentially also create or move the hardlink
1433          * target in the parent directory common to (ip) and (tdip).  The
1434          * consolidation code can modify ip->cluster.  The returned cluster
1435          * is locked.
1436          */
1437         ip = VTOI(ap->a_vp);
1438         KASSERT(ip->pmp, ("ip->pmp is NULL %p %p", ip, ip->pmp));
1439         hammer2_pfs_memory_wait(ip->pmp);
1440         hammer2_trans_init(ip->pmp, 0);
1441
1442         /*
1443          * Target should be an indexed inode or there's no way we will ever
1444          * be able to find it!
1445          */
1446         KKASSERT((ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE) == 0);
1447
1448         error = 0;
1449
1450         /*
1451          * Can return NULL and error == EXDEV if the common parent
1452          * crosses a directory with the xlink flag set.
1453          */
1454         hammer2_inode_lock(tdip, 0);
1455         hammer2_inode_lock(ip, 0);
1456
1457         /*
1458          * Create the directory entry and bump nlinks.
1459          */
1460         if (error == 0) {
1461                 error = hammer2_dirent_create(tdip, name, name_len,
1462                                               ip->meta.inum, ip->meta.type);
1463                 hammer2_inode_modify(ip);
1464                 ++ip->meta.nlinks;
1465         }
1466         if (error == 0) {
1467                 /*
1468                  * Update dip's mtime
1469                  */
1470                 uint64_t mtime;
1471
1472                 hammer2_update_time(&mtime);
1473                 hammer2_inode_modify(tdip);
1474                 tdip->meta.mtime = mtime;
1475
1476                 cache_setunresolved(ap->a_nch);
1477                 cache_setvp(ap->a_nch, ap->a_vp);
1478         }
1479         hammer2_inode_unlock(ip);
1480         hammer2_inode_unlock(tdip);
1481
1482         hammer2_trans_done(ip->pmp);
1483         hammer2_knote(ap->a_vp, NOTE_LINK);
1484         hammer2_knote(ap->a_dvp, NOTE_WRITE);
1485
1486         return error;
1487 }
1488
1489 /*
1490  * hammer2_vop_ncreate { nch, dvp, vpp, cred, vap }
1491  *
1492  * The operating system has already ensured that the directory entry
1493  * does not exist and done all appropriate namespace locking.
1494  */
1495 static
1496 int
1497 hammer2_vop_ncreate(struct vop_ncreate_args *ap)
1498 {
1499         hammer2_inode_t *dip;
1500         hammer2_inode_t *nip;
1501         struct namecache *ncp;
1502         const uint8_t *name;
1503         size_t name_len;
1504         hammer2_tid_t inum;
1505         int error;
1506
1507         dip = VTOI(ap->a_dvp);
1508         if (dip->pmp->ronly)
1509                 return (EROFS);
1510         if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1)
1511                 return (ENOSPC);
1512
1513         ncp = ap->a_nch->ncp;
1514         name = ncp->nc_name;
1515         name_len = ncp->nc_nlen;
1516         hammer2_pfs_memory_wait(dip->pmp);
1517         hammer2_trans_init(dip->pmp, 0);
1518
1519         inum = hammer2_trans_newinum(dip->pmp);
1520
1521         /*
1522          * Create the actual inode as a hidden file in the iroot, then
1523          * create the directory entry.  The creation of the actual inode
1524          * sets its nlinks to 1 which is the value we desire.
1525          */
1526         nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred,
1527                                    NULL, 0, inum,
1528                                    inum, 0, 0,
1529                                    0, &error);
1530
1531         if (error) {
1532                 error = hammer2_error_to_errno(error);
1533         } else {
1534                 error = hammer2_dirent_create(dip, name, name_len,
1535                                               nip->meta.inum, nip->meta.type);
1536         }
1537         if (error) {
1538                 if (nip) {
1539                         hammer2_inode_unlink_finisher(nip, 0);
1540                         hammer2_inode_unlock(nip);
1541                         nip = NULL;
1542                 }
1543                 *ap->a_vpp = NULL;
1544         } else {
1545                 *ap->a_vpp = hammer2_igetv(nip, &error);
1546                 hammer2_inode_unlock(nip);
1547         }
1548
1549         /*
1550          * Update dip's mtime
1551          */
1552         if (error == 0) {
1553                 uint64_t mtime;
1554
1555                 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1556                 hammer2_update_time(&mtime);
1557                 hammer2_inode_modify(dip);
1558                 dip->meta.mtime = mtime;
1559                 hammer2_inode_unlock(dip);
1560         }
1561
1562         hammer2_trans_done(dip->pmp);
1563
1564         if (error == 0) {
1565                 cache_setunresolved(ap->a_nch);
1566                 cache_setvp(ap->a_nch, *ap->a_vpp);
1567                 hammer2_knote(ap->a_dvp, NOTE_WRITE);
1568         }
1569         return error;
1570 }
1571
1572 /*
1573  * Make a device node (typically a fifo)
1574  */
1575 static
1576 int
1577 hammer2_vop_nmknod(struct vop_nmknod_args *ap)
1578 {
1579         hammer2_inode_t *dip;
1580         hammer2_inode_t *nip;
1581         struct namecache *ncp;
1582         const uint8_t *name;
1583         size_t name_len;
1584         hammer2_tid_t inum;
1585         int error;
1586
1587         dip = VTOI(ap->a_dvp);
1588         if (dip->pmp->ronly)
1589                 return (EROFS);
1590         if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1)
1591                 return (ENOSPC);
1592
1593         ncp = ap->a_nch->ncp;
1594         name = ncp->nc_name;
1595         name_len = ncp->nc_nlen;
1596         hammer2_pfs_memory_wait(dip->pmp);
1597         hammer2_trans_init(dip->pmp, 0);
1598
1599         /*
1600          * Create the device inode and then create the directory entry.
1601          */
1602         inum = hammer2_trans_newinum(dip->pmp);
1603         nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred,
1604                                    NULL, 0, inum,
1605                                    inum, 0, 0,
1606                                    0, &error);
1607         if (error == 0) {
1608                 error = hammer2_dirent_create(dip, name, name_len,
1609                                               nip->meta.inum, nip->meta.type);
1610         }
1611         if (error) {
1612                 if (nip) {
1613                         hammer2_inode_unlink_finisher(nip, 0);
1614                         hammer2_inode_unlock(nip);
1615                         nip = NULL;
1616                 }
1617                 *ap->a_vpp = NULL;
1618         } else {
1619                 *ap->a_vpp = hammer2_igetv(nip, &error);
1620                 hammer2_inode_unlock(nip);
1621         }
1622
1623         /*
1624          * Update dip's mtime
1625          */
1626         if (error == 0) {
1627                 uint64_t mtime;
1628
1629                 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1630                 hammer2_update_time(&mtime);
1631                 hammer2_inode_modify(dip);
1632                 dip->meta.mtime = mtime;
1633                 hammer2_inode_unlock(dip);
1634         }
1635
1636         hammer2_trans_done(dip->pmp);
1637
1638         if (error == 0) {
1639                 cache_setunresolved(ap->a_nch);
1640                 cache_setvp(ap->a_nch, *ap->a_vpp);
1641                 hammer2_knote(ap->a_dvp, NOTE_WRITE);
1642         }
1643         return error;
1644 }
1645
1646 /*
1647  * hammer2_vop_nsymlink { nch, dvp, vpp, cred, vap, target }
1648  */
1649 static
1650 int
1651 hammer2_vop_nsymlink(struct vop_nsymlink_args *ap)
1652 {
1653         hammer2_inode_t *dip;
1654         hammer2_inode_t *nip;
1655         struct namecache *ncp;
1656         const uint8_t *name;
1657         size_t name_len;
1658         hammer2_tid_t inum;
1659         int error;
1660
1661         dip = VTOI(ap->a_dvp);
1662         if (dip->pmp->ronly)
1663                 return (EROFS);
1664         if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1)
1665                 return (ENOSPC);
1666
1667         ncp = ap->a_nch->ncp;
1668         name = ncp->nc_name;
1669         name_len = ncp->nc_nlen;
1670         hammer2_pfs_memory_wait(dip->pmp);
1671         hammer2_trans_init(dip->pmp, 0);
1672
1673         ap->a_vap->va_type = VLNK;      /* enforce type */
1674
1675         /*
1676          * Create the softlink as an inode and then create the directory
1677          * entry.
1678          */
1679         inum = hammer2_trans_newinum(dip->pmp);
1680
1681         nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred,
1682                                    NULL, 0, inum,
1683                                    inum, 0, 0,
1684                                    0, &error);
1685         if (error == 0) {
1686                 error = hammer2_dirent_create(dip, name, name_len,
1687                                               nip->meta.inum, nip->meta.type);
1688         }
1689         if (error) {
1690                 if (nip) {
1691                         hammer2_inode_unlink_finisher(nip, 0);
1692                         hammer2_inode_unlock(nip);
1693                         nip = NULL;
1694                 }
1695                 *ap->a_vpp = NULL;
1696                 hammer2_trans_done(dip->pmp);
1697                 return error;
1698         }
1699         *ap->a_vpp = hammer2_igetv(nip, &error);
1700
1701         /*
1702          * Build the softlink (~like file data) and finalize the namecache.
1703          */
1704         if (error == 0) {
1705                 size_t bytes;
1706                 struct uio auio;
1707                 struct iovec aiov;
1708
1709                 bytes = strlen(ap->a_target);
1710
1711                 hammer2_inode_unlock(nip);
1712                 bzero(&auio, sizeof(auio));
1713                 bzero(&aiov, sizeof(aiov));
1714                 auio.uio_iov = &aiov;
1715                 auio.uio_segflg = UIO_SYSSPACE;
1716                 auio.uio_rw = UIO_WRITE;
1717                 auio.uio_resid = bytes;
1718                 auio.uio_iovcnt = 1;
1719                 auio.uio_td = curthread;
1720                 aiov.iov_base = ap->a_target;
1721                 aiov.iov_len = bytes;
1722                 error = hammer2_write_file(nip, &auio, IO_APPEND, 0);
1723                 /* XXX handle error */
1724                 error = 0;
1725         } else {
1726                 hammer2_inode_unlock(nip);
1727         }
1728
1729         /*
1730          * Update dip's mtime
1731          */
1732         if (error == 0) {
1733                 uint64_t mtime;
1734
1735                 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1736                 hammer2_update_time(&mtime);
1737                 hammer2_inode_modify(dip);
1738                 dip->meta.mtime = mtime;
1739                 hammer2_inode_unlock(dip);
1740         }
1741
1742         hammer2_trans_done(dip->pmp);
1743
1744         /*
1745          * Finalize namecache
1746          */
1747         if (error == 0) {
1748                 cache_setunresolved(ap->a_nch);
1749                 cache_setvp(ap->a_nch, *ap->a_vpp);
1750                 hammer2_knote(ap->a_dvp, NOTE_WRITE);
1751         }
1752         return error;
1753 }
1754
1755 /*
1756  * hammer2_vop_nremove { nch, dvp, cred }
1757  */
1758 static
1759 int
1760 hammer2_vop_nremove(struct vop_nremove_args *ap)
1761 {
1762         hammer2_xop_unlink_t *xop;
1763         hammer2_inode_t *dip;
1764         hammer2_inode_t *ip;
1765         struct namecache *ncp;
1766         int error;
1767         int isopen;
1768
1769         dip = VTOI(ap->a_dvp);
1770         if (dip->pmp->ronly)
1771                 return (EROFS);
1772 #if 0
1773         /* allow removals, except user to also bulkfree */
1774         if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1)
1775                 return (ENOSPC);
1776 #endif
1777
1778         ncp = ap->a_nch->ncp;
1779
1780         hammer2_pfs_memory_wait(dip->pmp);
1781         hammer2_trans_init(dip->pmp, 0);
1782         hammer2_inode_lock(dip, 0);
1783
1784         /*
1785          * The unlink XOP unlinks the path from the directory and
1786          * locates and returns the cluster associated with the real inode.
1787          * We have to handle nlinks here on the frontend.
1788          */
1789         xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING);
1790         hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen);
1791
1792         /*
1793          * The namecache entry is locked so nobody can use this namespace.
1794          * Calculate isopen to determine if this namespace has an open vp
1795          * associated with it and resolve the vp only if it does.
1796          *
1797          * We try to avoid resolving the vnode if nobody has it open, but
1798          * note that the test is via this namespace only.
1799          */
1800         isopen = cache_isopen(ap->a_nch);
1801         xop->isdir = 0;
1802         xop->dopermanent = 0;
1803         hammer2_xop_start(&xop->head, hammer2_xop_unlink);
1804
1805         /*
1806          * Collect the real inode and adjust nlinks, destroy the real
1807          * inode if nlinks transitions to 0 and it was the real inode
1808          * (else it has already been removed).
1809          */
1810         error = hammer2_xop_collect(&xop->head, 0);
1811         error = hammer2_error_to_errno(error);
1812         hammer2_inode_unlock(dip);
1813
1814         if (error == 0) {
1815                 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1);
1816                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1817                 if (ip) {
1818                         hammer2_inode_unlink_finisher(ip, isopen);
1819                         hammer2_inode_unlock(ip);
1820                 }
1821         } else {
1822                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1823         }
1824
1825         /*
1826          * Update dip's mtime
1827          */
1828         if (error == 0) {
1829                 uint64_t mtime;
1830
1831                 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1832                 hammer2_update_time(&mtime);
1833                 hammer2_inode_modify(dip);
1834                 dip->meta.mtime = mtime;
1835                 hammer2_inode_unlock(dip);
1836         }
1837
1838         hammer2_inode_run_sideq(dip->pmp, 0);
1839         hammer2_trans_done(dip->pmp);
1840         if (error == 0) {
1841                 cache_unlink(ap->a_nch);
1842                 hammer2_knote(ap->a_dvp, NOTE_WRITE);
1843         }
1844         return (error);
1845 }
1846
1847 /*
1848  * hammer2_vop_nrmdir { nch, dvp, cred }
1849  */
1850 static
1851 int
1852 hammer2_vop_nrmdir(struct vop_nrmdir_args *ap)
1853 {
1854         hammer2_xop_unlink_t *xop;
1855         hammer2_inode_t *dip;
1856         hammer2_inode_t *ip;
1857         struct namecache *ncp;
1858         int isopen;
1859         int error;
1860
1861         dip = VTOI(ap->a_dvp);
1862         if (dip->pmp->ronly)
1863                 return (EROFS);
1864 #if 0
1865         /* allow removals, except user to also bulkfree */
1866         if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1)
1867                 return (ENOSPC);
1868 #endif
1869
1870         hammer2_pfs_memory_wait(dip->pmp);
1871         hammer2_trans_init(dip->pmp, 0);
1872         hammer2_inode_lock(dip, 0);
1873
1874         xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING);
1875
1876         ncp = ap->a_nch->ncp;
1877         hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen);
1878         isopen = cache_isopen(ap->a_nch);
1879         xop->isdir = 1;
1880         xop->dopermanent = 0;
1881         hammer2_xop_start(&xop->head, hammer2_xop_unlink);
1882
1883         /*
1884          * Collect the real inode and adjust nlinks, destroy the real
1885          * inode if nlinks transitions to 0 and it was the real inode
1886          * (else it has already been removed).
1887          */
1888         error = hammer2_xop_collect(&xop->head, 0);
1889         error = hammer2_error_to_errno(error);
1890         hammer2_inode_unlock(dip);
1891
1892         if (error == 0) {
1893                 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1);
1894                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1895                 if (ip) {
1896                         hammer2_inode_unlink_finisher(ip, isopen);
1897                         hammer2_inode_unlock(ip);
1898                 }
1899         } else {
1900                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1901         }
1902
1903         /*
1904          * Update dip's mtime
1905          */
1906         if (error == 0) {
1907                 uint64_t mtime;
1908
1909                 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1910                 hammer2_update_time(&mtime);
1911                 hammer2_inode_modify(dip);
1912                 dip->meta.mtime = mtime;
1913                 hammer2_inode_unlock(dip);
1914         }
1915
1916         hammer2_inode_run_sideq(dip->pmp, 0);
1917         hammer2_trans_done(dip->pmp);
1918         if (error == 0) {
1919                 cache_unlink(ap->a_nch);
1920                 hammer2_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
1921         }
1922         return (error);
1923 }
1924
1925 /*
1926  * hammer2_vop_nrename { fnch, tnch, fdvp, tdvp, cred }
1927  */
1928 static
1929 int
1930 hammer2_vop_nrename(struct vop_nrename_args *ap)
1931 {
1932         struct namecache *fncp;
1933         struct namecache *tncp;
1934         hammer2_inode_t *fdip;  /* source directory */
1935         hammer2_inode_t *tdip;  /* target directory */
1936         hammer2_inode_t *ip;    /* file being renamed */
1937         hammer2_inode_t *tip;   /* replaced target during rename or NULL */
1938         const uint8_t *fname;
1939         size_t fname_len;
1940         const uint8_t *tname;
1941         size_t tname_len;
1942         int error;
1943         int update_tdip;
1944         int update_fdip;
1945         hammer2_key_t tlhc;
1946
1947         if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount)
1948                 return(EXDEV);
1949         if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount)
1950                 return(EXDEV);
1951
1952         fdip = VTOI(ap->a_fdvp);        /* source directory */
1953         tdip = VTOI(ap->a_tdvp);        /* target directory */
1954
1955         if (fdip->pmp->ronly)
1956                 return (EROFS);
1957         if (hammer2_vfs_enospace(fdip, 0, ap->a_cred) > 1)
1958                 return (ENOSPC);
1959
1960         fncp = ap->a_fnch->ncp;         /* entry name in source */
1961         fname = fncp->nc_name;
1962         fname_len = fncp->nc_nlen;
1963
1964         tncp = ap->a_tnch->ncp;         /* entry name in target */
1965         tname = tncp->nc_name;
1966         tname_len = tncp->nc_nlen;
1967
1968         hammer2_pfs_memory_wait(tdip->pmp);
1969         hammer2_trans_init(tdip->pmp, 0);
1970
1971         update_tdip = 0;
1972         update_fdip = 0;
1973
1974         ip = VTOI(fncp->nc_vp);
1975         hammer2_inode_ref(ip);          /* extra ref */
1976
1977         /*
1978          * Lookup the target name to determine if a directory entry
1979          * is being overwritten.  We only hold related inode locks
1980          * temporarily, the operating system is expected to protect
1981          * against rename races.
1982          */
1983         tip = tncp->nc_vp ? VTOI(tncp->nc_vp) : NULL;
1984         if (tip)
1985                 hammer2_inode_ref(tip); /* extra ref */
1986
1987         /*
1988          * Can return NULL and error == EXDEV if the common parent
1989          * crosses a directory with the xlink flag set.
1990          *
1991          * For now try to avoid deadlocks with a simple pointer address
1992          * test.  (tip) can be NULL.
1993          */
1994         error = 0;
1995         if (fdip <= tdip) {
1996                 hammer2_inode_lock(fdip, 0);
1997                 hammer2_inode_lock(tdip, 0);
1998         } else {
1999                 hammer2_inode_lock(tdip, 0);
2000                 hammer2_inode_lock(fdip, 0);
2001         }
2002         if (tip) {
2003                 if (ip <= tip) {
2004                         hammer2_inode_lock(ip, 0);
2005                         hammer2_inode_lock(tip, 0);
2006                 } else {
2007                         hammer2_inode_lock(tip, 0);
2008                         hammer2_inode_lock(ip, 0);
2009                 }
2010         } else {
2011                 hammer2_inode_lock(ip, 0);
2012         }
2013
2014 #if 0
2015         /*
2016          * Delete the target namespace.
2017          *
2018          * REMOVED - NOW FOLDED INTO XOP_NRENAME OPERATION
2019          */
2020         {
2021                 hammer2_xop_unlink_t *xop2;
2022                 hammer2_inode_t *tip;
2023                 int isopen;
2024
2025                 /*
2026                  * The unlink XOP unlinks the path from the directory and
2027                  * locates and returns the cluster associated with the real
2028                  * inode.  We have to handle nlinks here on the frontend.
2029                  */
2030                 xop2 = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING);
2031                 hammer2_xop_setname(&xop2->head, tname, tname_len);
2032                 isopen = cache_isopen(ap->a_tnch);
2033                 xop2->isdir = -1;
2034                 xop2->dopermanent = 0;
2035                 hammer2_xop_start(&xop2->head, hammer2_xop_unlink);
2036
2037                 /*
2038                  * Collect the real inode and adjust nlinks, destroy the real
2039                  * inode if nlinks transitions to 0 and it was the real inode
2040                  * (else it has already been removed).
2041                  */
2042                 tnch_error = hammer2_xop_collect(&xop2->head, 0);
2043                 tnch_error = hammer2_error_to_errno(tnch_error);
2044                 /* hammer2_inode_unlock(tdip); */
2045
2046                 if (tnch_error == 0) {
2047                         tip = hammer2_inode_get(tdip->pmp, NULL,
2048                                                 &xop2->head.cluster, -1);
2049                         hammer2_xop_retire(&xop2->head, HAMMER2_XOPMASK_VOP);
2050                         if (tip) {
2051                                 hammer2_inode_unlink_finisher(tip, isopen);
2052                                 hammer2_inode_unlock(tip);
2053                         }
2054                 } else {
2055                         hammer2_xop_retire(&xop2->head, HAMMER2_XOPMASK_VOP);
2056                 }
2057                 /* hammer2_inode_lock(tdip, 0); */
2058
2059                 if (tnch_error && tnch_error != ENOENT) {
2060                         error = tnch_error;
2061                         goto done2;
2062                 }
2063                 update_tdip = 1;
2064         }
2065 #endif
2066
2067         /*
2068          * Resolve the collision space for (tdip, tname, tname_len)
2069          *
2070          * tdip must be held exclusively locked to prevent races since
2071          * multiple filenames can end up in the same collision space.
2072          */
2073         {
2074                 hammer2_xop_scanlhc_t *sxop;
2075                 hammer2_tid_t lhcbase;
2076
2077                 tlhc = hammer2_dirhash(tname, tname_len);
2078                 lhcbase = tlhc;
2079                 sxop = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING);
2080                 sxop->lhc = tlhc;
2081                 hammer2_xop_start(&sxop->head, hammer2_xop_scanlhc);
2082                 while ((error = hammer2_xop_collect(&sxop->head, 0)) == 0) {
2083                         if (tlhc != sxop->head.cluster.focus->bref.key)
2084                                 break;
2085                         ++tlhc;
2086                 }
2087                 error = hammer2_error_to_errno(error);
2088                 hammer2_xop_retire(&sxop->head, HAMMER2_XOPMASK_VOP);
2089
2090                 if (error) {
2091                         if (error != ENOENT)
2092                                 goto done2;
2093                         ++tlhc;
2094                         error = 0;
2095                 }
2096                 if ((lhcbase ^ tlhc) & ~HAMMER2_DIRHASH_LOMASK) {
2097                         error = ENOSPC;
2098                         goto done2;
2099                 }
2100         }
2101
2102         /*
2103          * Ready to go, issue the rename to the backend.  Note that meta-data
2104          * updates to the related inodes occur separately from the rename
2105          * operation.
2106          *
2107          * NOTE: While it is not necessary to update ip->meta.name*, doing
2108          *       so aids catastrophic recovery and debugging.
2109          */
2110         if (error == 0) {
2111                 hammer2_xop_nrename_t *xop4;
2112
2113                 xop4 = hammer2_xop_alloc(fdip, HAMMER2_XOP_MODIFYING);
2114                 xop4->lhc = tlhc;
2115                 xop4->ip_key = ip->meta.name_key;
2116                 hammer2_xop_setip2(&xop4->head, ip);
2117                 hammer2_xop_setip3(&xop4->head, tdip);
2118                 hammer2_xop_setname(&xop4->head, fname, fname_len);
2119                 hammer2_xop_setname2(&xop4->head, tname, tname_len);
2120                 hammer2_xop_start(&xop4->head, hammer2_xop_nrename);
2121
2122                 error = hammer2_xop_collect(&xop4->head, 0);
2123                 error = hammer2_error_to_errno(error);
2124                 hammer2_xop_retire(&xop4->head, HAMMER2_XOPMASK_VOP);
2125
2126                 if (error == ENOENT)
2127                         error = 0;
2128
2129                 /*
2130                  * Update inode meta-data.
2131                  *
2132                  * WARNING!  The in-memory inode (ip) structure does not
2133                  *           maintain a copy of the inode's filename buffer.
2134                  */
2135                 if (error == 0 &&
2136                     (ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE)) {
2137                         hammer2_inode_modify(ip);
2138                         ip->meta.name_len = tname_len;
2139                         ip->meta.name_key = tlhc;
2140                 }
2141                 if (error == 0) {
2142                         hammer2_inode_modify(ip);
2143                         ip->meta.iparent = tdip->meta.inum;
2144                 }
2145                 update_fdip = 1;
2146                 update_tdip = 1;
2147         }
2148
2149 done2:
2150         /*
2151          * If no error, the backend has replaced the target directory entry.
2152          * We must adjust nlinks on the original replace target if it exists.
2153          */
2154         if (error == 0 && tip) {
2155                 int isopen;
2156
2157                 isopen = cache_isopen(ap->a_tnch);
2158                 hammer2_inode_unlink_finisher(tip, isopen);
2159         }
2160
2161         /*
2162          * Update directory mtimes to represent the something changed.
2163          */
2164         if (update_fdip || update_tdip) {
2165                 uint64_t mtime;
2166
2167                 hammer2_update_time(&mtime);
2168                 if (update_fdip) {
2169                         hammer2_inode_modify(fdip);
2170                         fdip->meta.mtime = mtime;
2171                 }
2172                 if (update_tdip) {
2173                         hammer2_inode_modify(tdip);
2174                         tdip->meta.mtime = mtime;
2175                 }
2176         }
2177         if (tip) {
2178                 hammer2_inode_unlock(tip);
2179                 hammer2_inode_drop(tip);
2180         }
2181         hammer2_inode_unlock(ip);
2182         hammer2_inode_unlock(tdip);
2183         hammer2_inode_unlock(fdip);
2184         hammer2_inode_drop(ip);
2185         hammer2_inode_run_sideq(fdip->pmp, 0);
2186
2187         hammer2_trans_done(tdip->pmp);
2188
2189         /*
2190          * Issue the namecache update after unlocking all the internal
2191          * hammer structures, otherwise we might deadlock.
2192          */
2193         if (error == 0 && tip) {
2194                 cache_unlink(ap->a_tnch);
2195                 cache_setunresolved(ap->a_tnch);
2196         }
2197         if (error == 0) {
2198                 cache_rename(ap->a_fnch, ap->a_tnch);
2199                 hammer2_knote(ap->a_fdvp, NOTE_WRITE);
2200                 hammer2_knote(ap->a_tdvp, NOTE_WRITE);
2201                 hammer2_knote(fncp->nc_vp, NOTE_RENAME);
2202         }
2203
2204         return (error);
2205 }
2206
2207 /*
2208  * hammer2_vop_ioctl { vp, command, data, fflag, cred }
2209  */
2210 static
2211 int
2212 hammer2_vop_ioctl(struct vop_ioctl_args *ap)
2213 {
2214         hammer2_inode_t *ip;
2215         int error;
2216
2217         ip = VTOI(ap->a_vp);
2218
2219         error = hammer2_ioctl(ip, ap->a_command, (void *)ap->a_data,
2220                               ap->a_fflag, ap->a_cred);
2221         return (error);
2222 }
2223
2224 static
2225 int
2226 hammer2_vop_mountctl(struct vop_mountctl_args *ap)
2227 {
2228         struct mount *mp;
2229         hammer2_pfs_t *pmp;
2230         int rc;
2231
2232         switch (ap->a_op) {
2233         case (MOUNTCTL_SET_EXPORT):
2234                 mp = ap->a_head.a_ops->head.vv_mount;
2235                 pmp = MPTOPMP(mp);
2236
2237                 if (ap->a_ctllen != sizeof(struct export_args))
2238                         rc = (EINVAL);
2239                 else
2240                         rc = vfs_export(mp, &pmp->export,
2241                                         (const struct export_args *)ap->a_ctl);
2242                 break;
2243         default:
2244                 rc = vop_stdmountctl(ap);
2245                 break;
2246         }
2247         return (rc);
2248 }
2249
2250 /*
2251  * KQFILTER
2252  */
2253 static void filt_hammer2detach(struct knote *kn);
2254 static int filt_hammer2read(struct knote *kn, long hint);
2255 static int filt_hammer2write(struct knote *kn, long hint);
2256 static int filt_hammer2vnode(struct knote *kn, long hint);
2257
2258 static struct filterops hammer2read_filtops =
2259         { FILTEROP_ISFD | FILTEROP_MPSAFE,
2260           NULL, filt_hammer2detach, filt_hammer2read };
2261 static struct filterops hammer2write_filtops =
2262         { FILTEROP_ISFD | FILTEROP_MPSAFE,
2263           NULL, filt_hammer2detach, filt_hammer2write };
2264 static struct filterops hammer2vnode_filtops =
2265         { FILTEROP_ISFD | FILTEROP_MPSAFE,
2266           NULL, filt_hammer2detach, filt_hammer2vnode };
2267
2268 static
2269 int
2270 hammer2_vop_kqfilter(struct vop_kqfilter_args *ap)
2271 {
2272         struct vnode *vp = ap->a_vp;
2273         struct knote *kn = ap->a_kn;
2274
2275         switch (kn->kn_filter) {
2276         case EVFILT_READ:
2277                 kn->kn_fop = &hammer2read_filtops;
2278                 break;
2279         case EVFILT_WRITE:
2280                 kn->kn_fop = &hammer2write_filtops;
2281                 break;
2282         case EVFILT_VNODE:
2283                 kn->kn_fop = &hammer2vnode_filtops;
2284                 break;
2285         default:
2286                 return (EOPNOTSUPP);
2287         }
2288
2289         kn->kn_hook = (caddr_t)vp;
2290
2291         knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
2292
2293         return(0);
2294 }
2295
2296 static void
2297 filt_hammer2detach(struct knote *kn)
2298 {
2299         struct vnode *vp = (void *)kn->kn_hook;
2300
2301         knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
2302 }
2303
2304 static int
2305 filt_hammer2read(struct knote *kn, long hint)
2306 {
2307         struct vnode *vp = (void *)kn->kn_hook;
2308         hammer2_inode_t *ip = VTOI(vp);
2309         off_t off;
2310
2311         if (hint == NOTE_REVOKE) {
2312                 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT);
2313                 return(1);
2314         }
2315         off = ip->meta.size - kn->kn_fp->f_offset;
2316         kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX;
2317         if (kn->kn_sfflags & NOTE_OLDAPI)
2318                 return(1);
2319         return (kn->kn_data != 0);
2320 }
2321
2322
2323 static int
2324 filt_hammer2write(struct knote *kn, long hint)
2325 {
2326         if (hint == NOTE_REVOKE)
2327                 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT);
2328         kn->kn_data = 0;
2329         return (1);
2330 }
2331
2332 static int
2333 filt_hammer2vnode(struct knote *kn, long hint)
2334 {
2335         if (kn->kn_sfflags & hint)
2336                 kn->kn_fflags |= hint;
2337         if (hint == NOTE_REVOKE) {
2338                 kn->kn_flags |= (EV_EOF | EV_NODATA);
2339                 return (1);
2340         }
2341         return (kn->kn_fflags != 0);
2342 }
2343
2344 /*
2345  * FIFO VOPS
2346  */
2347 static
2348 int
2349 hammer2_vop_markatime(struct vop_markatime_args *ap)
2350 {
2351         hammer2_inode_t *ip;
2352         struct vnode *vp;
2353
2354         vp = ap->a_vp;
2355         ip = VTOI(vp);
2356
2357         if (ip->pmp->ronly)
2358                 return (EROFS);
2359         return(0);
2360 }
2361
2362 static
2363 int
2364 hammer2_vop_fifokqfilter(struct vop_kqfilter_args *ap)
2365 {
2366         int error;
2367
2368         error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2369         if (error)
2370                 error = hammer2_vop_kqfilter(ap);
2371         return(error);
2372 }
2373
2374 /*
2375  * VOPS vector
2376  */
2377 struct vop_ops hammer2_vnode_vops = {
2378         .vop_default    = vop_defaultop,
2379         .vop_fsync      = hammer2_vop_fsync,
2380         .vop_getpages   = vop_stdgetpages,
2381         .vop_putpages   = vop_stdputpages,
2382         .vop_access     = hammer2_vop_access,
2383         .vop_advlock    = hammer2_vop_advlock,
2384         .vop_close      = hammer2_vop_close,
2385         .vop_nlink      = hammer2_vop_nlink,
2386         .vop_ncreate    = hammer2_vop_ncreate,
2387         .vop_nsymlink   = hammer2_vop_nsymlink,
2388         .vop_nremove    = hammer2_vop_nremove,
2389         .vop_nrmdir     = hammer2_vop_nrmdir,
2390         .vop_nrename    = hammer2_vop_nrename,
2391         .vop_getattr    = hammer2_vop_getattr,
2392         .vop_setattr    = hammer2_vop_setattr,
2393         .vop_readdir    = hammer2_vop_readdir,
2394         .vop_readlink   = hammer2_vop_readlink,
2395         .vop_getpages   = vop_stdgetpages,
2396         .vop_putpages   = vop_stdputpages,
2397         .vop_read       = hammer2_vop_read,
2398         .vop_write      = hammer2_vop_write,
2399         .vop_open       = hammer2_vop_open,
2400         .vop_inactive   = hammer2_vop_inactive,
2401         .vop_reclaim    = hammer2_vop_reclaim,
2402         .vop_nresolve   = hammer2_vop_nresolve,
2403         .vop_nlookupdotdot = hammer2_vop_nlookupdotdot,
2404         .vop_nmkdir     = hammer2_vop_nmkdir,
2405         .vop_nmknod     = hammer2_vop_nmknod,
2406         .vop_ioctl      = hammer2_vop_ioctl,
2407         .vop_mountctl   = hammer2_vop_mountctl,
2408         .vop_bmap       = hammer2_vop_bmap,
2409         .vop_strategy   = hammer2_vop_strategy,
2410         .vop_kqfilter   = hammer2_vop_kqfilter
2411 };
2412
2413 struct vop_ops hammer2_spec_vops = {
2414         .vop_default =          vop_defaultop,
2415         .vop_fsync =            hammer2_vop_fsync,
2416         .vop_read =             vop_stdnoread,
2417         .vop_write =            vop_stdnowrite,
2418         .vop_access =           hammer2_vop_access,
2419         .vop_close =            hammer2_vop_close,
2420         .vop_markatime =        hammer2_vop_markatime,
2421         .vop_getattr =          hammer2_vop_getattr,
2422         .vop_inactive =         hammer2_vop_inactive,
2423         .vop_reclaim =          hammer2_vop_reclaim,
2424         .vop_setattr =          hammer2_vop_setattr
2425 };
2426
2427 struct vop_ops hammer2_fifo_vops = {
2428         .vop_default =          fifo_vnoperate,
2429         .vop_fsync =            hammer2_vop_fsync,
2430 #if 0
2431         .vop_read =             hammer2_vop_fiforead,
2432         .vop_write =            hammer2_vop_fifowrite,
2433 #endif
2434         .vop_access =           hammer2_vop_access,
2435 #if 0
2436         .vop_close =            hammer2_vop_fifoclose,
2437 #endif
2438         .vop_markatime =        hammer2_vop_markatime,
2439         .vop_getattr =          hammer2_vop_getattr,
2440         .vop_inactive =         hammer2_vop_inactive,
2441         .vop_reclaim =          hammer2_vop_reclaim,
2442         .vop_setattr =          hammer2_vop_setattr,
2443         .vop_kqfilter =         hammer2_vop_fifokqfilter
2444 };
2445