1 /* 2 * Copyright (c) 2011-2018 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_SYNC / 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 HAMMER2_INODE_DIRTYDATA)) && 179 (ip->flags & HAMMER2_INODE_ISDELETED) == 0) { 180 hammer2_inode_sideq_t *ipul; 181 182 ipul = kmalloc(sizeof(*ipul), pmp->minode, M_WAITOK | M_ZERO); 183 ipul->ip = ip; 184 185 hammer2_spin_ex(&pmp->list_spin); 186 if ((ip->flags & HAMMER2_INODE_ONSIDEQ) == 0) { 187 /* ref -> sideq */ 188 atomic_set_int(&ip->flags, HAMMER2_INODE_ONSIDEQ); 189 TAILQ_INSERT_TAIL(&pmp->sideq, ipul, entry); 190 ++pmp->sideq_count; 191 hammer2_spin_unex(&pmp->list_spin); 192 } else { 193 hammer2_spin_unex(&pmp->list_spin); 194 kfree(ipul, pmp->minode); 195 hammer2_inode_drop(ip); /* vp ref */ 196 } 197 /* retain ref from vp for ipul */ 198 } else { 199 hammer2_inode_drop(ip); /* vp ref */ 200 } 201 202 /* 203 * XXX handle background sync when ip dirty, kernel will no longer 204 * notify us regarding this inode because there is no longer a 205 * vnode attached to it. 206 */ 207 208 return (0); 209 } 210 211 /* 212 * Currently this function synchronizes the front-end inode state to the 213 * backend chain topology, then flushes the inode's chain and sub-topology 214 * to backend media. This function does not flush the root topology down to 215 * the inode. 216 */ 217 static 218 int 219 hammer2_vop_fsync(struct vop_fsync_args *ap) 220 { 221 hammer2_inode_t *ip; 222 struct vnode *vp; 223 int error1; 224 int error2; 225 226 vp = ap->a_vp; 227 ip = VTOI(vp); 228 error1 = 0; 229 230 hammer2_trans_init(ip->pmp, 0); 231 232 /* 233 * Flush dirty buffers in the file's logical buffer cache. 234 * It is best to wait for the strategy code to commit the 235 * buffers to the device's backing buffer cache before 236 * then trying to flush the inode. 237 * 238 * This should be quick, but certain inode modifications cached 239 * entirely in the hammer2_inode structure may not trigger a 240 * buffer read until the flush so the fsync can wind up also 241 * doing scattered reads. 242 */ 243 vfsync(vp, ap->a_waitfor, 1, NULL, NULL); 244 bio_track_wait(&vp->v_track_write, 0, 0); 245 246 /* 247 * Flush any inode changes 248 */ 249 hammer2_inode_lock(ip, 0); 250 if (ip->flags & (HAMMER2_INODE_RESIZED|HAMMER2_INODE_MODIFIED)) 251 error1 = hammer2_inode_chain_sync(ip); 252 253 /* 254 * Flush dirty chains related to the inode. 255 * 256 * NOTE! XXX We do not currently flush to the volume root, ultimately 257 * we will want to have a shortcut for the flushed inode stored 258 * in the volume root for recovery purposes. 259 */ 260 error2 = hammer2_inode_chain_flush(ip); 261 if (error2) 262 error1 = error2; 263 264 /* 265 * We may be able to clear the vnode dirty flag. The 266 * hammer2_pfs_moderate() code depends on this usually working. 267 */ 268 if ((ip->flags & (HAMMER2_INODE_MODIFIED | 269 HAMMER2_INODE_RESIZED | 270 HAMMER2_INODE_DIRTYDATA)) == 0 && 271 RB_EMPTY(&vp->v_rbdirty_tree) && 272 !bio_track_active(&vp->v_track_write)) { 273 vclrisdirty(vp); 274 } 275 hammer2_inode_unlock(ip); 276 hammer2_trans_done(ip->pmp, 0); 277 278 return (error1); 279 } 280 281 static 282 int 283 hammer2_vop_access(struct vop_access_args *ap) 284 { 285 hammer2_inode_t *ip = VTOI(ap->a_vp); 286 uid_t uid; 287 gid_t gid; 288 int error; 289 290 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED); 291 uid = hammer2_to_unix_xid(&ip->meta.uid); 292 gid = hammer2_to_unix_xid(&ip->meta.gid); 293 error = vop_helper_access(ap, uid, gid, ip->meta.mode, ip->meta.uflags); 294 hammer2_inode_unlock(ip); 295 296 return (error); 297 } 298 299 static 300 int 301 hammer2_vop_getattr(struct vop_getattr_args *ap) 302 { 303 hammer2_pfs_t *pmp; 304 hammer2_inode_t *ip; 305 struct vnode *vp; 306 struct vattr *vap; 307 hammer2_chain_t *chain; 308 int i; 309 310 vp = ap->a_vp; 311 vap = ap->a_vap; 312 313 ip = VTOI(vp); 314 pmp = ip->pmp; 315 316 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED); 317 318 vap->va_fsid = pmp->mp->mnt_stat.f_fsid.val[0]; 319 vap->va_fileid = ip->meta.inum; 320 vap->va_mode = ip->meta.mode; 321 vap->va_nlink = ip->meta.nlinks; 322 vap->va_uid = hammer2_to_unix_xid(&ip->meta.uid); 323 vap->va_gid = hammer2_to_unix_xid(&ip->meta.gid); 324 vap->va_rmajor = 0; 325 vap->va_rminor = 0; 326 vap->va_size = ip->meta.size; /* protected by shared lock */ 327 vap->va_blocksize = HAMMER2_PBUFSIZE; 328 vap->va_flags = ip->meta.uflags; 329 hammer2_time_to_timespec(ip->meta.ctime, &vap->va_ctime); 330 hammer2_time_to_timespec(ip->meta.mtime, &vap->va_mtime); 331 hammer2_time_to_timespec(ip->meta.mtime, &vap->va_atime); 332 vap->va_gen = 1; 333 vap->va_bytes = 0; 334 if (ip->meta.type == HAMMER2_OBJTYPE_DIRECTORY) { 335 /* 336 * Can't really calculate directory use sans the files under 337 * it, just assume one block for now. 338 */ 339 vap->va_bytes += HAMMER2_INODE_BYTES; 340 } else { 341 for (i = 0; i < ip->cluster.nchains; ++i) { 342 if ((chain = ip->cluster.array[i].chain) != NULL) { 343 if (vap->va_bytes < 344 chain->bref.embed.stats.data_count) { 345 vap->va_bytes = 346 chain->bref.embed.stats.data_count; 347 } 348 } 349 } 350 } 351 vap->va_type = hammer2_get_vtype(ip->meta.type); 352 vap->va_filerev = 0; 353 vap->va_uid_uuid = ip->meta.uid; 354 vap->va_gid_uuid = ip->meta.gid; 355 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID | 356 VA_FSID_UUID_VALID; 357 358 hammer2_inode_unlock(ip); 359 360 return (0); 361 } 362 363 static 364 int 365 hammer2_vop_setattr(struct vop_setattr_args *ap) 366 { 367 hammer2_inode_t *ip; 368 struct vnode *vp; 369 struct vattr *vap; 370 int error; 371 int kflags = 0; 372 uint64_t ctime; 373 374 vp = ap->a_vp; 375 vap = ap->a_vap; 376 hammer2_update_time(&ctime); 377 378 ip = VTOI(vp); 379 380 if (ip->pmp->ronly) 381 return (EROFS); 382 if (hammer2_vfs_enospace(ip, 0, ap->a_cred) > 1) 383 return (ENOSPC); 384 385 hammer2_pfs_memory_wait(ip, 0); 386 hammer2_trans_init(ip->pmp, 0); 387 hammer2_inode_lock(ip, 0); 388 error = 0; 389 390 if (vap->va_flags != VNOVAL) { 391 uint32_t flags; 392 393 flags = ip->meta.uflags; 394 error = vop_helper_setattr_flags(&flags, vap->va_flags, 395 hammer2_to_unix_xid(&ip->meta.uid), 396 ap->a_cred); 397 if (error == 0) { 398 if (ip->meta.uflags != flags) { 399 hammer2_inode_modify(ip); 400 ip->meta.uflags = flags; 401 ip->meta.ctime = ctime; 402 kflags |= NOTE_ATTRIB; 403 } 404 if (ip->meta.uflags & (IMMUTABLE | APPEND)) { 405 error = 0; 406 goto done; 407 } 408 } 409 goto done; 410 } 411 if (ip->meta.uflags & (IMMUTABLE | APPEND)) { 412 error = EPERM; 413 goto done; 414 } 415 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 416 mode_t cur_mode = ip->meta.mode; 417 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid); 418 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid); 419 uuid_t uuid_uid; 420 uuid_t uuid_gid; 421 422 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid, 423 ap->a_cred, 424 &cur_uid, &cur_gid, &cur_mode); 425 if (error == 0) { 426 hammer2_guid_to_uuid(&uuid_uid, cur_uid); 427 hammer2_guid_to_uuid(&uuid_gid, cur_gid); 428 if (bcmp(&uuid_uid, &ip->meta.uid, sizeof(uuid_uid)) || 429 bcmp(&uuid_gid, &ip->meta.gid, sizeof(uuid_gid)) || 430 ip->meta.mode != cur_mode 431 ) { 432 hammer2_inode_modify(ip); 433 ip->meta.uid = uuid_uid; 434 ip->meta.gid = uuid_gid; 435 ip->meta.mode = cur_mode; 436 ip->meta.ctime = ctime; 437 } 438 kflags |= NOTE_ATTRIB; 439 } 440 } 441 442 /* 443 * Resize the file 444 */ 445 if (vap->va_size != VNOVAL && ip->meta.size != vap->va_size) { 446 switch(vp->v_type) { 447 case VREG: 448 if (vap->va_size == ip->meta.size) 449 break; 450 if (vap->va_size < ip->meta.size) { 451 hammer2_mtx_ex(&ip->truncate_lock); 452 hammer2_truncate_file(ip, vap->va_size); 453 hammer2_mtx_unlock(&ip->truncate_lock); 454 kflags |= NOTE_WRITE; 455 } else { 456 hammer2_extend_file(ip, vap->va_size); 457 kflags |= NOTE_WRITE | NOTE_EXTEND; 458 } 459 hammer2_inode_modify(ip); 460 ip->meta.mtime = ctime; 461 vclrflags(vp, VLASTWRITETS); 462 break; 463 default: 464 error = EINVAL; 465 goto done; 466 } 467 } 468 #if 0 469 /* atime not supported */ 470 if (vap->va_atime.tv_sec != VNOVAL) { 471 hammer2_inode_modify(ip); 472 ip->meta.atime = hammer2_timespec_to_time(&vap->va_atime); 473 kflags |= NOTE_ATTRIB; 474 } 475 #endif 476 if (vap->va_mode != (mode_t)VNOVAL) { 477 mode_t cur_mode = ip->meta.mode; 478 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid); 479 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid); 480 481 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred, 482 cur_uid, cur_gid, &cur_mode); 483 if (error == 0 && ip->meta.mode != cur_mode) { 484 hammer2_inode_modify(ip); 485 ip->meta.mode = cur_mode; 486 ip->meta.ctime = ctime; 487 kflags |= NOTE_ATTRIB; 488 } 489 } 490 491 if (vap->va_mtime.tv_sec != VNOVAL) { 492 hammer2_inode_modify(ip); 493 ip->meta.mtime = hammer2_timespec_to_time(&vap->va_mtime); 494 kflags |= NOTE_ATTRIB; 495 vclrflags(vp, VLASTWRITETS); 496 } 497 498 done: 499 /* 500 * If a truncation occurred we must call chain_sync() now in order 501 * to trim the related data chains, otherwise a later expansion can 502 * cause havoc. 503 * 504 * If an extend occured that changed the DIRECTDATA state, we must 505 * call inode_fsync now in order to prepare the inode's indirect 506 * block table. 507 * 508 * WARNING! This means we are making an adjustment to the inode's 509 * chain outside of sync/fsync, and not just to inode->meta, which 510 * may result in some consistency issues if a crash were to occur 511 * at just the wrong time. 512 */ 513 if (ip->flags & HAMMER2_INODE_RESIZED) 514 hammer2_inode_chain_sync(ip); 515 516 /* 517 * Cleanup. 518 */ 519 hammer2_inode_unlock(ip); 520 hammer2_trans_done(ip->pmp, 1); 521 hammer2_knote(ip->vp, kflags); 522 523 return (error); 524 } 525 526 static 527 int 528 hammer2_vop_readdir(struct vop_readdir_args *ap) 529 { 530 hammer2_xop_readdir_t *xop; 531 hammer2_blockref_t bref; 532 hammer2_inode_t *ip; 533 hammer2_tid_t inum; 534 hammer2_key_t lkey; 535 struct uio *uio; 536 off_t *cookies; 537 off_t saveoff; 538 int cookie_index; 539 int ncookies; 540 int error; 541 int eofflag; 542 int r; 543 544 ip = VTOI(ap->a_vp); 545 uio = ap->a_uio; 546 saveoff = uio->uio_offset; 547 eofflag = 0; 548 error = 0; 549 550 /* 551 * Setup cookies directory entry cookies if requested 552 */ 553 if (ap->a_ncookies) { 554 ncookies = uio->uio_resid / 16 + 1; 555 if (ncookies > 1024) 556 ncookies = 1024; 557 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 558 } else { 559 ncookies = -1; 560 cookies = NULL; 561 } 562 cookie_index = 0; 563 564 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED); 565 566 /* 567 * Handle artificial entries. To ensure that only positive 64 bit 568 * quantities are returned to userland we always strip off bit 63. 569 * The hash code is designed such that codes 0x0000-0x7FFF are not 570 * used, allowing us to use these codes for articial entries. 571 * 572 * Entry 0 is used for '.' and entry 1 is used for '..'. Do not 573 * allow '..' to cross the mount point into (e.g.) the super-root. 574 */ 575 if (saveoff == 0) { 576 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK; 577 r = vop_write_dirent(&error, uio, inum, DT_DIR, 1, "."); 578 if (r) 579 goto done; 580 if (cookies) 581 cookies[cookie_index] = saveoff; 582 ++saveoff; 583 ++cookie_index; 584 if (cookie_index == ncookies) 585 goto done; 586 } 587 588 if (saveoff == 1) { 589 /* 590 * Be careful with lockorder when accessing ".." 591 * 592 * (ip is the current dir. xip is the parent dir). 593 */ 594 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK; 595 if (ip != ip->pmp->iroot) 596 inum = ip->meta.iparent & HAMMER2_DIRHASH_USERMSK; 597 r = vop_write_dirent(&error, uio, inum, DT_DIR, 2, ".."); 598 if (r) 599 goto done; 600 if (cookies) 601 cookies[cookie_index] = saveoff; 602 ++saveoff; 603 ++cookie_index; 604 if (cookie_index == ncookies) 605 goto done; 606 } 607 608 lkey = saveoff | HAMMER2_DIRHASH_VISIBLE; 609 if (hammer2_debug & 0x0020) 610 kprintf("readdir: lkey %016jx\n", lkey); 611 if (error) 612 goto done; 613 614 /* 615 * Use XOP for cluster scan. 616 * 617 * parent is the inode cluster, already locked for us. Don't 618 * double lock shared locks as this will screw up upgrades. 619 */ 620 xop = hammer2_xop_alloc(ip, 0); 621 xop->lkey = lkey; 622 hammer2_xop_start(&xop->head, hammer2_xop_readdir); 623 624 for (;;) { 625 const hammer2_inode_data_t *ripdata; 626 const char *dname; 627 int dtype; 628 629 error = hammer2_xop_collect(&xop->head, 0); 630 error = hammer2_error_to_errno(error); 631 if (error) { 632 break; 633 } 634 if (cookie_index == ncookies) 635 break; 636 if (hammer2_debug & 0x0020) 637 kprintf("cluster chain %p %p\n", 638 xop->head.cluster.focus, 639 (xop->head.cluster.focus ? 640 xop->head.cluster.focus->data : (void *)-1)); 641 hammer2_cluster_bref(&xop->head.cluster, &bref); 642 643 if (bref.type == HAMMER2_BREF_TYPE_INODE) { 644 ripdata = &hammer2_xop_gdata(&xop->head)->ipdata; 645 dtype = hammer2_get_dtype(ripdata->meta.type); 646 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK; 647 r = vop_write_dirent(&error, uio, 648 ripdata->meta.inum & 649 HAMMER2_DIRHASH_USERMSK, 650 dtype, 651 ripdata->meta.name_len, 652 ripdata->filename); 653 hammer2_xop_pdata(&xop->head); 654 if (r) 655 break; 656 if (cookies) 657 cookies[cookie_index] = saveoff; 658 ++cookie_index; 659 } else if (bref.type == HAMMER2_BREF_TYPE_DIRENT) { 660 uint16_t namlen; 661 662 dtype = hammer2_get_dtype(bref.embed.dirent.type); 663 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK; 664 namlen = bref.embed.dirent.namlen; 665 if (namlen <= sizeof(bref.check.buf)) { 666 dname = bref.check.buf; 667 } else { 668 dname = hammer2_xop_gdata(&xop->head)->buf; 669 } 670 r = vop_write_dirent(&error, uio, 671 bref.embed.dirent.inum, dtype, 672 namlen, dname); 673 if (namlen > sizeof(bref.check.buf)) 674 hammer2_xop_pdata(&xop->head); 675 if (r) 676 break; 677 if (cookies) 678 cookies[cookie_index] = saveoff; 679 ++cookie_index; 680 } else { 681 /* XXX chain error */ 682 kprintf("bad chain type readdir %d\n", bref.type); 683 } 684 } 685 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 686 if (error == ENOENT) { 687 error = 0; 688 eofflag = 1; 689 saveoff = (hammer2_key_t)-1; 690 } else { 691 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK; 692 } 693 done: 694 hammer2_inode_unlock(ip); 695 if (ap->a_eofflag) 696 *ap->a_eofflag = eofflag; 697 if (hammer2_debug & 0x0020) 698 kprintf("readdir: done at %016jx\n", saveoff); 699 uio->uio_offset = saveoff & ~HAMMER2_DIRHASH_VISIBLE; 700 if (error && cookie_index == 0) { 701 if (cookies) { 702 kfree(cookies, M_TEMP); 703 *ap->a_ncookies = 0; 704 *ap->a_cookies = NULL; 705 } 706 } else { 707 if (cookies) { 708 *ap->a_ncookies = cookie_index; 709 *ap->a_cookies = cookies; 710 } 711 } 712 return (error); 713 } 714 715 /* 716 * hammer2_vop_readlink { vp, uio, cred } 717 */ 718 static 719 int 720 hammer2_vop_readlink(struct vop_readlink_args *ap) 721 { 722 struct vnode *vp; 723 hammer2_inode_t *ip; 724 int error; 725 726 vp = ap->a_vp; 727 if (vp->v_type != VLNK) 728 return (EINVAL); 729 ip = VTOI(vp); 730 731 error = hammer2_read_file(ip, ap->a_uio, 0); 732 return (error); 733 } 734 735 static 736 int 737 hammer2_vop_read(struct vop_read_args *ap) 738 { 739 struct vnode *vp; 740 hammer2_inode_t *ip; 741 struct uio *uio; 742 int error; 743 int seqcount; 744 int bigread; 745 746 /* 747 * Read operations supported on this vnode? 748 */ 749 vp = ap->a_vp; 750 if (vp->v_type != VREG) 751 return (EINVAL); 752 753 /* 754 * Misc 755 */ 756 ip = VTOI(vp); 757 uio = ap->a_uio; 758 error = 0; 759 760 seqcount = ap->a_ioflag >> 16; 761 bigread = (uio->uio_resid > 100 * 1024 * 1024); 762 763 error = hammer2_read_file(ip, uio, seqcount); 764 return (error); 765 } 766 767 static 768 int 769 hammer2_vop_write(struct vop_write_args *ap) 770 { 771 hammer2_inode_t *ip; 772 thread_t td; 773 struct vnode *vp; 774 struct uio *uio; 775 int error; 776 int seqcount; 777 int ioflag; 778 779 /* 780 * Read operations supported on this vnode? 781 */ 782 vp = ap->a_vp; 783 if (vp->v_type != VREG) 784 return (EINVAL); 785 786 /* 787 * Misc 788 */ 789 ip = VTOI(vp); 790 ioflag = ap->a_ioflag; 791 uio = ap->a_uio; 792 error = 0; 793 if (ip->pmp->ronly) 794 return (EROFS); 795 switch (hammer2_vfs_enospace(ip, uio->uio_resid, ap->a_cred)) { 796 case 2: 797 return (ENOSPC); 798 case 1: 799 ioflag |= IO_DIRECT; /* semi-synchronous */ 800 /* fall through */ 801 default: 802 break; 803 } 804 805 seqcount = ioflag >> 16; 806 807 /* 808 * Check resource limit 809 */ 810 if (uio->uio_resid > 0 && (td = uio->uio_td) != NULL && td->td_proc && 811 uio->uio_offset + uio->uio_resid > 812 td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 813 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ); 814 return (EFBIG); 815 } 816 817 /* 818 * The transaction interlocks against flush initiations 819 * (note: but will run concurrently with the actual flush). 820 * 821 * To avoid deadlocking against the VM system, we must flag any 822 * transaction related to the buffer cache or other direct 823 * VM page manipulation. 824 */ 825 if (uio->uio_segflg == UIO_NOCOPY) { 826 hammer2_trans_init(ip->pmp, HAMMER2_TRANS_BUFCACHE); 827 } else { 828 hammer2_pfs_memory_wait(ip, 0); 829 hammer2_trans_init(ip->pmp, 0); 830 } 831 error = hammer2_write_file(ip, uio, ioflag, seqcount); 832 hammer2_trans_done(ip->pmp, 1); 833 834 return (error); 835 } 836 837 /* 838 * Perform read operations on a file or symlink given an UNLOCKED 839 * inode and uio. 840 * 841 * The passed ip is not locked. 842 */ 843 static 844 int 845 hammer2_read_file(hammer2_inode_t *ip, struct uio *uio, int seqcount) 846 { 847 hammer2_off_t size; 848 struct buf *bp; 849 int error; 850 851 error = 0; 852 853 /* 854 * UIO read loop. 855 * 856 * WARNING! Assumes that the kernel interlocks size changes at the 857 * vnode level. 858 */ 859 hammer2_mtx_sh(&ip->lock); 860 hammer2_mtx_sh(&ip->truncate_lock); 861 size = ip->meta.size; 862 hammer2_mtx_unlock(&ip->lock); 863 864 while (uio->uio_resid > 0 && uio->uio_offset < size) { 865 hammer2_key_t lbase; 866 hammer2_key_t leof; 867 int lblksize; 868 int loff; 869 int n; 870 871 lblksize = hammer2_calc_logical(ip, uio->uio_offset, 872 &lbase, &leof); 873 874 #if 1 875 bp = NULL; 876 error = cluster_readx(ip->vp, leof, lbase, lblksize, 877 B_NOTMETA | B_KVABIO, 878 uio->uio_resid, 879 seqcount * MAXBSIZE, 880 &bp); 881 #else 882 if (uio->uio_segflg == UIO_NOCOPY) { 883 bp = getblk(ip->vp, lbase, lblksize, 884 GETBLK_BHEAVY | GETBLK_KVABIO, 0); 885 if (bp->b_flags & B_CACHE) { 886 int i; 887 int j = 0; 888 if (bp->b_xio.xio_npages != 16) 889 kprintf("NPAGES BAD\n"); 890 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 891 vm_page_t m; 892 m = bp->b_xio.xio_pages[i]; 893 if (m == NULL || m->valid == 0) { 894 kprintf("bp %016jx %016jx pg %d inv", 895 lbase, leof, i); 896 if (m) 897 kprintf("m->object %p/%p", m->object, ip->vp->v_object); 898 kprintf("\n"); 899 j = 1; 900 } 901 } 902 if (j) 903 kprintf("b_flags %08x, b_error %d\n", bp->b_flags, bp->b_error); 904 } 905 bqrelse(bp); 906 } 907 error = bread_kvabio(ip->vp, lbase, lblksize, &bp); 908 #endif 909 if (error) { 910 brelse(bp); 911 break; 912 } 913 bkvasync(bp); 914 loff = (int)(uio->uio_offset - lbase); 915 n = lblksize - loff; 916 if (n > uio->uio_resid) 917 n = uio->uio_resid; 918 if (n > size - uio->uio_offset) 919 n = (int)(size - uio->uio_offset); 920 bp->b_flags |= B_AGE; 921 uiomovebp(bp, (char *)bp->b_data + loff, n, uio); 922 bqrelse(bp); 923 } 924 hammer2_mtx_unlock(&ip->truncate_lock); 925 926 return (error); 927 } 928 929 /* 930 * Write to the file represented by the inode via the logical buffer cache. 931 * The inode may represent a regular file or a symlink. 932 * 933 * The inode must not be locked. 934 */ 935 static 936 int 937 hammer2_write_file(hammer2_inode_t *ip, struct uio *uio, 938 int ioflag, int seqcount) 939 { 940 hammer2_key_t old_eof; 941 hammer2_key_t new_eof; 942 struct buf *bp; 943 int kflags; 944 int error; 945 int modified; 946 947 /* 948 * Setup if append 949 * 950 * WARNING! Assumes that the kernel interlocks size changes at the 951 * vnode level. 952 */ 953 hammer2_mtx_ex(&ip->lock); 954 hammer2_mtx_sh(&ip->truncate_lock); 955 if (ioflag & IO_APPEND) 956 uio->uio_offset = ip->meta.size; 957 old_eof = ip->meta.size; 958 959 /* 960 * Extend the file if necessary. If the write fails at some point 961 * we will truncate it back down to cover as much as we were able 962 * to write. 963 * 964 * Doing this now makes it easier to calculate buffer sizes in 965 * the loop. 966 */ 967 kflags = 0; 968 error = 0; 969 modified = 0; 970 971 if (uio->uio_offset + uio->uio_resid > old_eof) { 972 new_eof = uio->uio_offset + uio->uio_resid; 973 modified = 1; 974 hammer2_extend_file(ip, new_eof); 975 kflags |= NOTE_EXTEND; 976 } else { 977 new_eof = old_eof; 978 } 979 hammer2_mtx_unlock(&ip->lock); 980 981 /* 982 * UIO write loop 983 */ 984 while (uio->uio_resid > 0) { 985 hammer2_key_t lbase; 986 int trivial; 987 int endofblk; 988 int lblksize; 989 int loff; 990 int n; 991 992 /* 993 * Don't allow the buffer build to blow out the buffer 994 * cache. 995 */ 996 if ((ioflag & IO_RECURSE) == 0) 997 bwillwrite(HAMMER2_PBUFSIZE); 998 999 /* 1000 * This nominally tells us how much we can cluster and 1001 * what the logical buffer size needs to be. Currently 1002 * we don't try to cluster the write and just handle one 1003 * block at a time. 1004 */ 1005 lblksize = hammer2_calc_logical(ip, uio->uio_offset, 1006 &lbase, NULL); 1007 loff = (int)(uio->uio_offset - lbase); 1008 1009 KKASSERT(lblksize <= 65536); 1010 1011 /* 1012 * Calculate bytes to copy this transfer and whether the 1013 * copy completely covers the buffer or not. 1014 */ 1015 trivial = 0; 1016 n = lblksize - loff; 1017 if (n > uio->uio_resid) { 1018 n = uio->uio_resid; 1019 if (loff == lbase && uio->uio_offset + n == new_eof) 1020 trivial = 1; 1021 endofblk = 0; 1022 } else { 1023 if (loff == 0) 1024 trivial = 1; 1025 endofblk = 1; 1026 } 1027 if (lbase >= new_eof) 1028 trivial = 1; 1029 1030 /* 1031 * Get the buffer 1032 */ 1033 if (uio->uio_segflg == UIO_NOCOPY) { 1034 /* 1035 * Issuing a write with the same data backing the 1036 * buffer. Instantiate the buffer to collect the 1037 * backing vm pages, then read-in any missing bits. 1038 * 1039 * This case is used by vop_stdputpages(). 1040 */ 1041 bp = getblk(ip->vp, lbase, lblksize, 1042 GETBLK_BHEAVY | GETBLK_KVABIO, 0); 1043 if ((bp->b_flags & B_CACHE) == 0) { 1044 bqrelse(bp); 1045 error = bread_kvabio(ip->vp, lbase, 1046 lblksize, &bp); 1047 } 1048 } else if (trivial) { 1049 /* 1050 * Even though we are entirely overwriting the buffer 1051 * we may still have to zero it out to avoid a 1052 * mmap/write visibility issue. 1053 */ 1054 bp = getblk(ip->vp, lbase, lblksize, 1055 GETBLK_BHEAVY | GETBLK_KVABIO, 0); 1056 if ((bp->b_flags & B_CACHE) == 0) 1057 vfs_bio_clrbuf(bp); 1058 } else { 1059 /* 1060 * Partial overwrite, read in any missing bits then 1061 * replace the portion being written. 1062 * 1063 * (The strategy code will detect zero-fill physical 1064 * blocks for this case). 1065 */ 1066 error = bread_kvabio(ip->vp, lbase, lblksize, &bp); 1067 if (error == 0) 1068 bheavy(bp); 1069 } 1070 1071 if (error) { 1072 brelse(bp); 1073 break; 1074 } 1075 1076 /* 1077 * Ok, copy the data in 1078 */ 1079 bkvasync(bp); 1080 error = uiomovebp(bp, bp->b_data + loff, n, uio); 1081 kflags |= NOTE_WRITE; 1082 modified = 1; 1083 if (error) { 1084 brelse(bp); 1085 break; 1086 } 1087 1088 /* 1089 * WARNING: Pageout daemon will issue UIO_NOCOPY writes 1090 * with IO_SYNC or IO_ASYNC set. These writes 1091 * must be handled as the pageout daemon expects. 1092 * 1093 * NOTE! H2 relies on cluster_write() here because it 1094 * cannot preallocate disk blocks at the logical 1095 * level due to not knowing what the compression 1096 * size will be at this time. 1097 * 1098 * We must use cluster_write() here and we depend 1099 * on the write-behind feature to flush buffers 1100 * appropriately. If we let the buffer daemons do 1101 * it the block allocations will be all over the 1102 * map. 1103 */ 1104 if (ioflag & IO_SYNC) { 1105 bwrite(bp); 1106 } else if ((ioflag & IO_DIRECT) && endofblk) { 1107 bawrite(bp); 1108 } else if (ioflag & IO_ASYNC) { 1109 bawrite(bp); 1110 } else if (ip->vp->v_mount->mnt_flag & MNT_NOCLUSTERW) { 1111 bdwrite(bp); 1112 } else { 1113 #if 1 1114 bp->b_flags |= B_CLUSTEROK; 1115 cluster_write(bp, new_eof, lblksize, seqcount); 1116 #else 1117 bp->b_flags |= B_CLUSTEROK; 1118 bdwrite(bp); 1119 #endif 1120 } 1121 } 1122 1123 /* 1124 * Cleanup. If we extended the file EOF but failed to write through 1125 * the entire write is a failure and we have to back-up. 1126 */ 1127 if (error && new_eof != old_eof) { 1128 hammer2_mtx_unlock(&ip->truncate_lock); 1129 hammer2_mtx_ex(&ip->lock); 1130 hammer2_mtx_ex(&ip->truncate_lock); 1131 hammer2_truncate_file(ip, old_eof); 1132 if (ip->flags & HAMMER2_INODE_MODIFIED) 1133 hammer2_inode_chain_sync(ip); 1134 hammer2_mtx_unlock(&ip->lock); 1135 } else if (modified) { 1136 struct vnode *vp = ip->vp; 1137 1138 hammer2_mtx_ex(&ip->lock); 1139 hammer2_inode_modify(ip); 1140 if (uio->uio_segflg == UIO_NOCOPY) { 1141 if (vp->v_flag & VLASTWRITETS) { 1142 ip->meta.mtime = 1143 (unsigned long)vp->v_lastwrite_ts.tv_sec * 1144 1000000 + 1145 vp->v_lastwrite_ts.tv_nsec / 1000; 1146 } 1147 } else { 1148 hammer2_update_time(&ip->meta.mtime); 1149 vclrflags(vp, VLASTWRITETS); 1150 } 1151 1152 #if 0 1153 /* 1154 * REMOVED - handled by hammer2_extend_file(). Do not issue 1155 * a chain_sync() outside of a sync/fsync except for DIRECTDATA 1156 * state changes. 1157 * 1158 * Under normal conditions we only issue a chain_sync if 1159 * the inode's DIRECTDATA state changed. 1160 */ 1161 if (ip->flags & HAMMER2_INODE_RESIZED) 1162 hammer2_inode_chain_sync(ip); 1163 #endif 1164 hammer2_mtx_unlock(&ip->lock); 1165 hammer2_knote(ip->vp, kflags); 1166 } 1167 hammer2_trans_assert_strategy(ip->pmp); 1168 hammer2_mtx_unlock(&ip->truncate_lock); 1169 1170 return error; 1171 } 1172 1173 /* 1174 * Truncate the size of a file. The inode must not be locked. 1175 * 1176 * We must unconditionally set HAMMER2_INODE_RESIZED to properly 1177 * ensure that any on-media data beyond the new file EOF has been destroyed. 1178 * 1179 * WARNING: nvtruncbuf() can only be safely called without the inode lock 1180 * held due to the way our write thread works. If the truncation 1181 * occurs in the middle of a buffer, nvtruncbuf() is responsible 1182 * for dirtying that buffer and zeroing out trailing bytes. 1183 * 1184 * WARNING! Assumes that the kernel interlocks size changes at the 1185 * vnode level. 1186 * 1187 * WARNING! Caller assumes responsibility for removing dead blocks 1188 * if INODE_RESIZED is set. 1189 */ 1190 static 1191 void 1192 hammer2_truncate_file(hammer2_inode_t *ip, hammer2_key_t nsize) 1193 { 1194 hammer2_key_t lbase; 1195 int nblksize; 1196 1197 hammer2_mtx_unlock(&ip->lock); 1198 if (ip->vp) { 1199 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL); 1200 nvtruncbuf(ip->vp, nsize, 1201 nblksize, (int)nsize & (nblksize - 1), 1202 0); 1203 } 1204 hammer2_mtx_ex(&ip->lock); 1205 KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0); 1206 ip->osize = ip->meta.size; 1207 ip->meta.size = nsize; 1208 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED); 1209 hammer2_inode_modify(ip); 1210 } 1211 1212 /* 1213 * Extend the size of a file. The inode must not be locked. 1214 * 1215 * Even though the file size is changing, we do not have to set the 1216 * INODE_RESIZED bit unless the file size crosses the EMBEDDED_BYTES 1217 * boundary. When this occurs a hammer2_inode_chain_sync() is required 1218 * to prepare the inode cluster's indirect block table, otherwise 1219 * async execution of the strategy code will implode on us. 1220 * 1221 * WARNING! Assumes that the kernel interlocks size changes at the 1222 * vnode level. 1223 * 1224 * WARNING! Caller assumes responsibility for transitioning out 1225 * of the inode DIRECTDATA mode if INODE_RESIZED is set. 1226 */ 1227 static 1228 void 1229 hammer2_extend_file(hammer2_inode_t *ip, hammer2_key_t nsize) 1230 { 1231 hammer2_key_t lbase; 1232 hammer2_key_t osize; 1233 int oblksize; 1234 int nblksize; 1235 1236 KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0); 1237 hammer2_inode_modify(ip); 1238 osize = ip->meta.size; 1239 ip->osize = osize; 1240 ip->meta.size = nsize; 1241 1242 /* 1243 * We must issue a chain_sync() when the DIRECTDATA state changes 1244 * to prevent confusion between the flush code and the in-memory 1245 * state. This is not perfect because we are doing it outside of 1246 * a sync/fsync operation, so it might not be fully synchronized 1247 * with the meta-data topology flush. 1248 */ 1249 if (osize <= HAMMER2_EMBEDDED_BYTES && nsize > HAMMER2_EMBEDDED_BYTES) { 1250 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED); 1251 hammer2_inode_chain_sync(ip); 1252 } 1253 1254 hammer2_mtx_unlock(&ip->lock); 1255 if (ip->vp) { 1256 oblksize = hammer2_calc_logical(ip, osize, &lbase, NULL); 1257 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL); 1258 nvextendbuf(ip->vp, 1259 osize, nsize, 1260 oblksize, nblksize, 1261 -1, -1, 0); 1262 } 1263 hammer2_mtx_ex(&ip->lock); 1264 } 1265 1266 static 1267 int 1268 hammer2_vop_nresolve(struct vop_nresolve_args *ap) 1269 { 1270 hammer2_xop_nresolve_t *xop; 1271 hammer2_inode_t *ip; 1272 hammer2_inode_t *dip; 1273 struct namecache *ncp; 1274 struct vnode *vp; 1275 int error; 1276 1277 dip = VTOI(ap->a_dvp); 1278 xop = hammer2_xop_alloc(dip, 0); 1279 1280 ncp = ap->a_nch->ncp; 1281 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen); 1282 1283 /* 1284 * Note: In DragonFly the kernel handles '.' and '..'. 1285 */ 1286 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1287 hammer2_xop_start(&xop->head, hammer2_xop_nresolve); 1288 1289 error = hammer2_xop_collect(&xop->head, 0); 1290 error = hammer2_error_to_errno(error); 1291 if (error) { 1292 ip = NULL; 1293 } else { 1294 ip = hammer2_inode_get(dip->pmp, dip, &xop->head, -1); 1295 } 1296 hammer2_inode_unlock(dip); 1297 1298 /* 1299 * Acquire the related vnode 1300 * 1301 * NOTE: For error processing, only ENOENT resolves the namecache 1302 * entry to NULL, otherwise we just return the error and 1303 * leave the namecache unresolved. 1304 * 1305 * NOTE: multiple hammer2_inode structures can be aliased to the 1306 * same chain element, for example for hardlinks. This 1307 * use case does not 'reattach' inode associations that 1308 * might already exist, but always allocates a new one. 1309 * 1310 * WARNING: inode structure is locked exclusively via inode_get 1311 * but chain was locked shared. inode_unlock() 1312 * will handle it properly. 1313 */ 1314 if (ip) { 1315 vp = hammer2_igetv(ip, &error); /* error set to UNIX error */ 1316 if (error == 0) { 1317 vn_unlock(vp); 1318 cache_setvp(ap->a_nch, vp); 1319 } else if (error == ENOENT) { 1320 cache_setvp(ap->a_nch, NULL); 1321 } 1322 hammer2_inode_unlock(ip); 1323 1324 /* 1325 * The vp should not be released until after we've disposed 1326 * of our locks, because it might cause vop_inactive() to 1327 * be called. 1328 */ 1329 if (vp) 1330 vrele(vp); 1331 } else { 1332 error = ENOENT; 1333 cache_setvp(ap->a_nch, NULL); 1334 } 1335 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1336 KASSERT(error || ap->a_nch->ncp->nc_vp != NULL, 1337 ("resolve error %d/%p ap %p\n", 1338 error, ap->a_nch->ncp->nc_vp, ap)); 1339 1340 return error; 1341 } 1342 1343 static 1344 int 1345 hammer2_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap) 1346 { 1347 hammer2_inode_t *dip; 1348 hammer2_tid_t inum; 1349 int error; 1350 1351 dip = VTOI(ap->a_dvp); 1352 inum = dip->meta.iparent; 1353 *ap->a_vpp = NULL; 1354 1355 if (inum) { 1356 error = hammer2_vfs_vget(ap->a_dvp->v_mount, NULL, 1357 inum, ap->a_vpp); 1358 } else { 1359 error = ENOENT; 1360 } 1361 return error; 1362 } 1363 1364 static 1365 int 1366 hammer2_vop_nmkdir(struct vop_nmkdir_args *ap) 1367 { 1368 hammer2_inode_t *dip; 1369 hammer2_inode_t *nip; 1370 struct namecache *ncp; 1371 const uint8_t *name; 1372 size_t name_len; 1373 hammer2_tid_t inum; 1374 int error; 1375 1376 dip = VTOI(ap->a_dvp); 1377 if (dip->pmp->ronly) 1378 return (EROFS); 1379 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1380 return (ENOSPC); 1381 1382 ncp = ap->a_nch->ncp; 1383 name = ncp->nc_name; 1384 name_len = ncp->nc_nlen; 1385 1386 hammer2_pfs_memory_wait(dip, 1); 1387 hammer2_trans_init(dip->pmp, 0); 1388 1389 inum = hammer2_trans_newinum(dip->pmp); 1390 1391 /* 1392 * Create the actual inode as a hidden file in the iroot, then 1393 * create the directory entry. The creation of the actual inode 1394 * sets its nlinks to 1 which is the value we desire. 1395 */ 1396 nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred, 1397 NULL, 0, inum, 1398 inum, 0, 0, 1399 0, &error); 1400 if (error) { 1401 error = hammer2_error_to_errno(error); 1402 } else { 1403 error = hammer2_dirent_create(dip, name, name_len, 1404 nip->meta.inum, nip->meta.type); 1405 /* returns UNIX error code */ 1406 } 1407 if (error) { 1408 if (nip) { 1409 hammer2_inode_unlink_finisher(nip, 0); 1410 hammer2_inode_unlock(nip); 1411 nip = NULL; 1412 } 1413 *ap->a_vpp = NULL; 1414 } else { 1415 *ap->a_vpp = hammer2_igetv(nip, &error); 1416 hammer2_inode_unlock(nip); 1417 } 1418 1419 /* 1420 * Update dip's mtime 1421 * 1422 * We can use a shared inode lock and allow the meta.mtime update 1423 * SMP race. hammer2_inode_modify() is MPSAFE w/a shared lock. 1424 */ 1425 if (error == 0) { 1426 uint64_t mtime; 1427 1428 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1429 hammer2_update_time(&mtime); 1430 hammer2_inode_modify(dip); 1431 dip->meta.mtime = mtime; 1432 hammer2_inode_unlock(dip); 1433 } 1434 1435 hammer2_trans_done(dip->pmp, 1); 1436 1437 if (error == 0) { 1438 cache_setunresolved(ap->a_nch); 1439 cache_setvp(ap->a_nch, *ap->a_vpp); 1440 hammer2_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1441 } 1442 return error; 1443 } 1444 1445 static 1446 int 1447 hammer2_vop_open(struct vop_open_args *ap) 1448 { 1449 return vop_stdopen(ap); 1450 } 1451 1452 /* 1453 * hammer2_vop_advlock { vp, id, op, fl, flags } 1454 */ 1455 static 1456 int 1457 hammer2_vop_advlock(struct vop_advlock_args *ap) 1458 { 1459 hammer2_inode_t *ip = VTOI(ap->a_vp); 1460 hammer2_off_t size; 1461 1462 size = ip->meta.size; 1463 return (lf_advlock(ap, &ip->advlock, size)); 1464 } 1465 1466 static 1467 int 1468 hammer2_vop_close(struct vop_close_args *ap) 1469 { 1470 return vop_stdclose(ap); 1471 } 1472 1473 /* 1474 * hammer2_vop_nlink { nch, dvp, vp, cred } 1475 * 1476 * Create a hardlink from (vp) to {dvp, nch}. 1477 */ 1478 static 1479 int 1480 hammer2_vop_nlink(struct vop_nlink_args *ap) 1481 { 1482 hammer2_inode_t *tdip; /* target directory to create link in */ 1483 hammer2_inode_t *ip; /* inode we are hardlinking to */ 1484 struct namecache *ncp; 1485 const uint8_t *name; 1486 size_t name_len; 1487 int error; 1488 1489 if (ap->a_dvp->v_mount != ap->a_vp->v_mount) 1490 return(EXDEV); 1491 1492 tdip = VTOI(ap->a_dvp); 1493 if (tdip->pmp->ronly) 1494 return (EROFS); 1495 if (hammer2_vfs_enospace(tdip, 0, ap->a_cred) > 1) 1496 return (ENOSPC); 1497 1498 ncp = ap->a_nch->ncp; 1499 name = ncp->nc_name; 1500 name_len = ncp->nc_nlen; 1501 1502 /* 1503 * ip represents the file being hardlinked. The file could be a 1504 * normal file or a hardlink target if it has already been hardlinked. 1505 * (with the new semantics, it will almost always be a hardlink 1506 * target). 1507 * 1508 * Bump nlinks and potentially also create or move the hardlink 1509 * target in the parent directory common to (ip) and (tdip). The 1510 * consolidation code can modify ip->cluster. The returned cluster 1511 * is locked. 1512 */ 1513 ip = VTOI(ap->a_vp); 1514 KASSERT(ip->pmp, ("ip->pmp is NULL %p %p", ip, ip->pmp)); 1515 hammer2_pfs_memory_wait(ip, 0); 1516 hammer2_trans_init(ip->pmp, 0); 1517 1518 /* 1519 * Target should be an indexed inode or there's no way we will ever 1520 * be able to find it! 1521 */ 1522 KKASSERT((ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE) == 0); 1523 1524 error = 0; 1525 1526 /* 1527 * Can return NULL and error == EXDEV if the common parent 1528 * crosses a directory with the xlink flag set. 1529 */ 1530 hammer2_inode_lock(tdip, 0); 1531 hammer2_inode_lock(ip, 0); 1532 1533 /* 1534 * Create the directory entry and bump nlinks. 1535 */ 1536 if (error == 0) { 1537 error = hammer2_dirent_create(tdip, name, name_len, 1538 ip->meta.inum, ip->meta.type); 1539 hammer2_inode_modify(ip); 1540 ++ip->meta.nlinks; 1541 } 1542 if (error == 0) { 1543 /* 1544 * Update dip's mtime 1545 */ 1546 uint64_t mtime; 1547 1548 hammer2_update_time(&mtime); 1549 hammer2_inode_modify(tdip); 1550 tdip->meta.mtime = mtime; 1551 1552 cache_setunresolved(ap->a_nch); 1553 cache_setvp(ap->a_nch, ap->a_vp); 1554 } 1555 hammer2_inode_unlock(ip); 1556 hammer2_inode_unlock(tdip); 1557 1558 hammer2_trans_done(ip->pmp, 1); 1559 hammer2_knote(ap->a_vp, NOTE_LINK); 1560 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1561 1562 return error; 1563 } 1564 1565 /* 1566 * hammer2_vop_ncreate { nch, dvp, vpp, cred, vap } 1567 * 1568 * The operating system has already ensured that the directory entry 1569 * does not exist and done all appropriate namespace locking. 1570 */ 1571 static 1572 int 1573 hammer2_vop_ncreate(struct vop_ncreate_args *ap) 1574 { 1575 hammer2_inode_t *dip; 1576 hammer2_inode_t *nip; 1577 struct namecache *ncp; 1578 const uint8_t *name; 1579 size_t name_len; 1580 hammer2_tid_t inum; 1581 int error; 1582 1583 dip = VTOI(ap->a_dvp); 1584 if (dip->pmp->ronly) 1585 return (EROFS); 1586 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1587 return (ENOSPC); 1588 1589 ncp = ap->a_nch->ncp; 1590 name = ncp->nc_name; 1591 name_len = ncp->nc_nlen; 1592 hammer2_pfs_memory_wait(dip, 1); 1593 hammer2_trans_init(dip->pmp, 0); 1594 1595 inum = hammer2_trans_newinum(dip->pmp); 1596 1597 /* 1598 * Create the actual inode as a hidden file in the iroot, then 1599 * create the directory entry. The creation of the actual inode 1600 * sets its nlinks to 1 which is the value we desire. 1601 */ 1602 nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred, 1603 NULL, 0, inum, 1604 inum, 0, 0, 1605 0, &error); 1606 1607 if (error) { 1608 error = hammer2_error_to_errno(error); 1609 } else { 1610 error = hammer2_dirent_create(dip, name, name_len, 1611 nip->meta.inum, nip->meta.type); 1612 } 1613 if (error) { 1614 if (nip) { 1615 hammer2_inode_unlink_finisher(nip, 0); 1616 hammer2_inode_unlock(nip); 1617 nip = NULL; 1618 } 1619 *ap->a_vpp = NULL; 1620 } else { 1621 *ap->a_vpp = hammer2_igetv(nip, &error); 1622 hammer2_inode_unlock(nip); 1623 } 1624 1625 /* 1626 * Update dip's mtime 1627 */ 1628 if (error == 0) { 1629 uint64_t mtime; 1630 1631 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1632 hammer2_update_time(&mtime); 1633 hammer2_inode_modify(dip); 1634 dip->meta.mtime = mtime; 1635 hammer2_inode_unlock(dip); 1636 } 1637 1638 hammer2_trans_done(dip->pmp, 1); 1639 1640 if (error == 0) { 1641 cache_setunresolved(ap->a_nch); 1642 cache_setvp(ap->a_nch, *ap->a_vpp); 1643 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1644 } 1645 return error; 1646 } 1647 1648 /* 1649 * Make a device node (typically a fifo) 1650 */ 1651 static 1652 int 1653 hammer2_vop_nmknod(struct vop_nmknod_args *ap) 1654 { 1655 hammer2_inode_t *dip; 1656 hammer2_inode_t *nip; 1657 struct namecache *ncp; 1658 const uint8_t *name; 1659 size_t name_len; 1660 hammer2_tid_t inum; 1661 int error; 1662 1663 dip = VTOI(ap->a_dvp); 1664 if (dip->pmp->ronly) 1665 return (EROFS); 1666 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1667 return (ENOSPC); 1668 1669 ncp = ap->a_nch->ncp; 1670 name = ncp->nc_name; 1671 name_len = ncp->nc_nlen; 1672 hammer2_pfs_memory_wait(dip, 1); 1673 hammer2_trans_init(dip->pmp, 0); 1674 1675 /* 1676 * Create the device inode and then create the directory entry. 1677 */ 1678 inum = hammer2_trans_newinum(dip->pmp); 1679 nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred, 1680 NULL, 0, inum, 1681 inum, 0, 0, 1682 0, &error); 1683 if (error == 0) { 1684 error = hammer2_dirent_create(dip, name, name_len, 1685 nip->meta.inum, nip->meta.type); 1686 } 1687 if (error) { 1688 if (nip) { 1689 hammer2_inode_unlink_finisher(nip, 0); 1690 hammer2_inode_unlock(nip); 1691 nip = NULL; 1692 } 1693 *ap->a_vpp = NULL; 1694 } else { 1695 *ap->a_vpp = hammer2_igetv(nip, &error); 1696 hammer2_inode_unlock(nip); 1697 } 1698 1699 /* 1700 * Update dip's mtime 1701 */ 1702 if (error == 0) { 1703 uint64_t mtime; 1704 1705 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1706 hammer2_update_time(&mtime); 1707 hammer2_inode_modify(dip); 1708 dip->meta.mtime = mtime; 1709 hammer2_inode_unlock(dip); 1710 } 1711 1712 hammer2_trans_done(dip->pmp, 1); 1713 1714 if (error == 0) { 1715 cache_setunresolved(ap->a_nch); 1716 cache_setvp(ap->a_nch, *ap->a_vpp); 1717 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1718 } 1719 return error; 1720 } 1721 1722 /* 1723 * hammer2_vop_nsymlink { nch, dvp, vpp, cred, vap, target } 1724 */ 1725 static 1726 int 1727 hammer2_vop_nsymlink(struct vop_nsymlink_args *ap) 1728 { 1729 hammer2_inode_t *dip; 1730 hammer2_inode_t *nip; 1731 struct namecache *ncp; 1732 const uint8_t *name; 1733 size_t name_len; 1734 hammer2_tid_t inum; 1735 int error; 1736 1737 dip = VTOI(ap->a_dvp); 1738 if (dip->pmp->ronly) 1739 return (EROFS); 1740 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1741 return (ENOSPC); 1742 1743 ncp = ap->a_nch->ncp; 1744 name = ncp->nc_name; 1745 name_len = ncp->nc_nlen; 1746 hammer2_pfs_memory_wait(dip, 1); 1747 hammer2_trans_init(dip->pmp, 0); 1748 1749 ap->a_vap->va_type = VLNK; /* enforce type */ 1750 1751 /* 1752 * Create the softlink as an inode and then create the directory 1753 * entry. 1754 */ 1755 inum = hammer2_trans_newinum(dip->pmp); 1756 1757 nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred, 1758 NULL, 0, inum, 1759 inum, 0, 0, 1760 0, &error); 1761 if (error == 0) { 1762 error = hammer2_dirent_create(dip, name, name_len, 1763 nip->meta.inum, nip->meta.type); 1764 } 1765 if (error) { 1766 if (nip) { 1767 hammer2_inode_unlink_finisher(nip, 0); 1768 hammer2_inode_unlock(nip); 1769 nip = NULL; 1770 } 1771 *ap->a_vpp = NULL; 1772 hammer2_trans_done(dip->pmp, 1); 1773 return error; 1774 } 1775 *ap->a_vpp = hammer2_igetv(nip, &error); 1776 1777 /* 1778 * Build the softlink (~like file data) and finalize the namecache. 1779 */ 1780 if (error == 0) { 1781 size_t bytes; 1782 struct uio auio; 1783 struct iovec aiov; 1784 1785 bytes = strlen(ap->a_target); 1786 1787 hammer2_inode_unlock(nip); 1788 bzero(&auio, sizeof(auio)); 1789 bzero(&aiov, sizeof(aiov)); 1790 auio.uio_iov = &aiov; 1791 auio.uio_segflg = UIO_SYSSPACE; 1792 auio.uio_rw = UIO_WRITE; 1793 auio.uio_resid = bytes; 1794 auio.uio_iovcnt = 1; 1795 auio.uio_td = curthread; 1796 aiov.iov_base = ap->a_target; 1797 aiov.iov_len = bytes; 1798 error = hammer2_write_file(nip, &auio, IO_APPEND, 0); 1799 /* XXX handle error */ 1800 error = 0; 1801 } else { 1802 hammer2_inode_unlock(nip); 1803 } 1804 1805 /* 1806 * Update dip's mtime 1807 */ 1808 if (error == 0) { 1809 uint64_t mtime; 1810 1811 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1812 hammer2_update_time(&mtime); 1813 hammer2_inode_modify(dip); 1814 dip->meta.mtime = mtime; 1815 hammer2_inode_unlock(dip); 1816 } 1817 1818 hammer2_trans_done(dip->pmp, 1); 1819 1820 /* 1821 * Finalize namecache 1822 */ 1823 if (error == 0) { 1824 cache_setunresolved(ap->a_nch); 1825 cache_setvp(ap->a_nch, *ap->a_vpp); 1826 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1827 } 1828 return error; 1829 } 1830 1831 /* 1832 * hammer2_vop_nremove { nch, dvp, cred } 1833 */ 1834 static 1835 int 1836 hammer2_vop_nremove(struct vop_nremove_args *ap) 1837 { 1838 hammer2_xop_unlink_t *xop; 1839 hammer2_inode_t *dip; 1840 hammer2_inode_t *ip; 1841 struct namecache *ncp; 1842 int error; 1843 int isopen; 1844 1845 dip = VTOI(ap->a_dvp); 1846 if (dip->pmp->ronly) 1847 return (EROFS); 1848 #if 0 1849 /* allow removals, except user to also bulkfree */ 1850 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1851 return (ENOSPC); 1852 #endif 1853 1854 ncp = ap->a_nch->ncp; 1855 1856 hammer2_pfs_memory_wait(dip, 1); 1857 hammer2_trans_init(dip->pmp, 0); 1858 hammer2_inode_lock(dip, 0); 1859 1860 /* 1861 * The unlink XOP unlinks the path from the directory and 1862 * locates and returns the cluster associated with the real inode. 1863 * We have to handle nlinks here on the frontend. 1864 */ 1865 xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING); 1866 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen); 1867 1868 /* 1869 * The namecache entry is locked so nobody can use this namespace. 1870 * Calculate isopen to determine if this namespace has an open vp 1871 * associated with it and resolve the vp only if it does. 1872 * 1873 * We try to avoid resolving the vnode if nobody has it open, but 1874 * note that the test is via this namespace only. 1875 */ 1876 isopen = cache_isopen(ap->a_nch); 1877 xop->isdir = 0; 1878 xop->dopermanent = 0; 1879 hammer2_xop_start(&xop->head, hammer2_xop_unlink); 1880 1881 /* 1882 * Collect the real inode and adjust nlinks, destroy the real 1883 * inode if nlinks transitions to 0 and it was the real inode 1884 * (else it has already been removed). 1885 */ 1886 error = hammer2_xop_collect(&xop->head, 0); 1887 error = hammer2_error_to_errno(error); 1888 hammer2_inode_unlock(dip); 1889 1890 if (error == 0) { 1891 ip = hammer2_inode_get(dip->pmp, dip, &xop->head, -1); 1892 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1893 if (ip) { 1894 hammer2_inode_unlink_finisher(ip, isopen); 1895 hammer2_inode_unlock(ip); 1896 } 1897 } else { 1898 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1899 } 1900 1901 /* 1902 * Update dip's mtime 1903 */ 1904 if (error == 0) { 1905 uint64_t mtime; 1906 1907 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1908 hammer2_update_time(&mtime); 1909 hammer2_inode_modify(dip); 1910 dip->meta.mtime = mtime; 1911 hammer2_inode_unlock(dip); 1912 } 1913 1914 hammer2_trans_done(dip->pmp, 1); 1915 if (error == 0) { 1916 cache_unlink(ap->a_nch); 1917 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1918 } 1919 return (error); 1920 } 1921 1922 /* 1923 * hammer2_vop_nrmdir { nch, dvp, cred } 1924 */ 1925 static 1926 int 1927 hammer2_vop_nrmdir(struct vop_nrmdir_args *ap) 1928 { 1929 hammer2_xop_unlink_t *xop; 1930 hammer2_inode_t *dip; 1931 hammer2_inode_t *ip; 1932 struct namecache *ncp; 1933 int isopen; 1934 int error; 1935 1936 dip = VTOI(ap->a_dvp); 1937 if (dip->pmp->ronly) 1938 return (EROFS); 1939 #if 0 1940 /* allow removals, except user to also bulkfree */ 1941 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1942 return (ENOSPC); 1943 #endif 1944 1945 hammer2_pfs_memory_wait(dip, 1); 1946 hammer2_trans_init(dip->pmp, 0); 1947 hammer2_inode_lock(dip, 0); 1948 1949 xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING); 1950 1951 ncp = ap->a_nch->ncp; 1952 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen); 1953 isopen = cache_isopen(ap->a_nch); 1954 xop->isdir = 1; 1955 xop->dopermanent = 0; 1956 hammer2_xop_start(&xop->head, hammer2_xop_unlink); 1957 1958 /* 1959 * Collect the real inode and adjust nlinks, destroy the real 1960 * inode if nlinks transitions to 0 and it was the real inode 1961 * (else it has already been removed). 1962 */ 1963 error = hammer2_xop_collect(&xop->head, 0); 1964 error = hammer2_error_to_errno(error); 1965 hammer2_inode_unlock(dip); 1966 1967 if (error == 0) { 1968 ip = hammer2_inode_get(dip->pmp, dip, &xop->head, -1); 1969 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1970 if (ip) { 1971 hammer2_inode_unlink_finisher(ip, isopen); 1972 hammer2_inode_unlock(ip); 1973 } 1974 } else { 1975 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1976 } 1977 1978 /* 1979 * Update dip's mtime 1980 */ 1981 if (error == 0) { 1982 uint64_t mtime; 1983 1984 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1985 hammer2_update_time(&mtime); 1986 hammer2_inode_modify(dip); 1987 dip->meta.mtime = mtime; 1988 hammer2_inode_unlock(dip); 1989 } 1990 1991 hammer2_trans_done(dip->pmp, 1); 1992 if (error == 0) { 1993 cache_unlink(ap->a_nch); 1994 hammer2_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1995 } 1996 return (error); 1997 } 1998 1999 /* 2000 * hammer2_vop_nrename { fnch, tnch, fdvp, tdvp, cred } 2001 */ 2002 static 2003 int 2004 hammer2_vop_nrename(struct vop_nrename_args *ap) 2005 { 2006 struct namecache *fncp; 2007 struct namecache *tncp; 2008 hammer2_inode_t *fdip; /* source directory */ 2009 hammer2_inode_t *tdip; /* target directory */ 2010 hammer2_inode_t *ip; /* file being renamed */ 2011 hammer2_inode_t *tip; /* replaced target during rename or NULL */ 2012 const uint8_t *fname; 2013 size_t fname_len; 2014 const uint8_t *tname; 2015 size_t tname_len; 2016 int error; 2017 int update_tdip; 2018 int update_fdip; 2019 hammer2_key_t tlhc; 2020 2021 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount) 2022 return(EXDEV); 2023 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount) 2024 return(EXDEV); 2025 2026 fdip = VTOI(ap->a_fdvp); /* source directory */ 2027 tdip = VTOI(ap->a_tdvp); /* target directory */ 2028 2029 if (fdip->pmp->ronly) 2030 return (EROFS); 2031 if (hammer2_vfs_enospace(fdip, 0, ap->a_cred) > 1) 2032 return (ENOSPC); 2033 2034 fncp = ap->a_fnch->ncp; /* entry name in source */ 2035 fname = fncp->nc_name; 2036 fname_len = fncp->nc_nlen; 2037 2038 tncp = ap->a_tnch->ncp; /* entry name in target */ 2039 tname = tncp->nc_name; 2040 tname_len = tncp->nc_nlen; 2041 2042 hammer2_pfs_memory_wait(tdip, 0); 2043 hammer2_trans_init(tdip->pmp, 0); 2044 2045 update_tdip = 0; 2046 update_fdip = 0; 2047 2048 ip = VTOI(fncp->nc_vp); 2049 hammer2_inode_ref(ip); /* extra ref */ 2050 2051 /* 2052 * Lookup the target name to determine if a directory entry 2053 * is being overwritten. We only hold related inode locks 2054 * temporarily, the operating system is expected to protect 2055 * against rename races. 2056 */ 2057 tip = tncp->nc_vp ? VTOI(tncp->nc_vp) : NULL; 2058 if (tip) 2059 hammer2_inode_ref(tip); /* extra ref */ 2060 2061 /* 2062 * Can return NULL and error == EXDEV if the common parent 2063 * crosses a directory with the xlink flag set. 2064 * 2065 * For now try to avoid deadlocks with a simple pointer address 2066 * test. (tip) can be NULL. 2067 */ 2068 error = 0; 2069 if (fdip <= tdip) { 2070 hammer2_inode_lock(fdip, 0); 2071 hammer2_inode_lock(tdip, 0); 2072 } else { 2073 hammer2_inode_lock(tdip, 0); 2074 hammer2_inode_lock(fdip, 0); 2075 } 2076 if (tip) { 2077 if (ip <= tip) { 2078 hammer2_inode_lock(ip, 0); 2079 hammer2_inode_lock(tip, 0); 2080 } else { 2081 hammer2_inode_lock(tip, 0); 2082 hammer2_inode_lock(ip, 0); 2083 } 2084 } else { 2085 hammer2_inode_lock(ip, 0); 2086 } 2087 2088 #if 0 2089 /* 2090 * Delete the target namespace. 2091 * 2092 * REMOVED - NOW FOLDED INTO XOP_NRENAME OPERATION 2093 */ 2094 { 2095 hammer2_xop_unlink_t *xop2; 2096 hammer2_inode_t *tip; 2097 int isopen; 2098 2099 /* 2100 * The unlink XOP unlinks the path from the directory and 2101 * locates and returns the cluster associated with the real 2102 * inode. We have to handle nlinks here on the frontend. 2103 */ 2104 xop2 = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING); 2105 hammer2_xop_setname(&xop2->head, tname, tname_len); 2106 isopen = cache_isopen(ap->a_tnch); 2107 xop2->isdir = -1; 2108 xop2->dopermanent = 0; 2109 hammer2_xop_start(&xop2->head, hammer2_xop_unlink); 2110 2111 /* 2112 * Collect the real inode and adjust nlinks, destroy the real 2113 * inode if nlinks transitions to 0 and it was the real inode 2114 * (else it has already been removed). 2115 */ 2116 tnch_error = hammer2_xop_collect(&xop2->head, 0); 2117 tnch_error = hammer2_error_to_errno(tnch_error); 2118 /* hammer2_inode_unlock(tdip); */ 2119 2120 if (tnch_error == 0) { 2121 tip = hammer2_inode_get(tdip->pmp, NULL, 2122 &xop2->head, -1); 2123 hammer2_xop_retire(&xop2->head, HAMMER2_XOPMASK_VOP); 2124 if (tip) { 2125 hammer2_inode_unlink_finisher(tip, isopen); 2126 hammer2_inode_unlock(tip); 2127 } 2128 } else { 2129 hammer2_xop_retire(&xop2->head, HAMMER2_XOPMASK_VOP); 2130 } 2131 /* hammer2_inode_lock(tdip, 0); */ 2132 2133 if (tnch_error && tnch_error != ENOENT) { 2134 error = tnch_error; 2135 goto done2; 2136 } 2137 update_tdip = 1; 2138 } 2139 #endif 2140 2141 /* 2142 * Resolve the collision space for (tdip, tname, tname_len) 2143 * 2144 * tdip must be held exclusively locked to prevent races since 2145 * multiple filenames can end up in the same collision space. 2146 */ 2147 { 2148 hammer2_xop_scanlhc_t *sxop; 2149 hammer2_tid_t lhcbase; 2150 2151 tlhc = hammer2_dirhash(tname, tname_len); 2152 lhcbase = tlhc; 2153 sxop = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING); 2154 sxop->lhc = tlhc; 2155 hammer2_xop_start(&sxop->head, hammer2_xop_scanlhc); 2156 while ((error = hammer2_xop_collect(&sxop->head, 0)) == 0) { 2157 if (tlhc != sxop->head.cluster.focus->bref.key) 2158 break; 2159 ++tlhc; 2160 } 2161 error = hammer2_error_to_errno(error); 2162 hammer2_xop_retire(&sxop->head, HAMMER2_XOPMASK_VOP); 2163 2164 if (error) { 2165 if (error != ENOENT) 2166 goto done2; 2167 ++tlhc; 2168 error = 0; 2169 } 2170 if ((lhcbase ^ tlhc) & ~HAMMER2_DIRHASH_LOMASK) { 2171 error = ENOSPC; 2172 goto done2; 2173 } 2174 } 2175 2176 /* 2177 * Ready to go, issue the rename to the backend. Note that meta-data 2178 * updates to the related inodes occur separately from the rename 2179 * operation. 2180 * 2181 * NOTE: While it is not necessary to update ip->meta.name*, doing 2182 * so aids catastrophic recovery and debugging. 2183 */ 2184 if (error == 0) { 2185 hammer2_xop_nrename_t *xop4; 2186 2187 xop4 = hammer2_xop_alloc(fdip, HAMMER2_XOP_MODIFYING); 2188 xop4->lhc = tlhc; 2189 xop4->ip_key = ip->meta.name_key; 2190 hammer2_xop_setip2(&xop4->head, ip); 2191 hammer2_xop_setip3(&xop4->head, tdip); 2192 hammer2_xop_setname(&xop4->head, fname, fname_len); 2193 hammer2_xop_setname2(&xop4->head, tname, tname_len); 2194 hammer2_xop_start(&xop4->head, hammer2_xop_nrename); 2195 2196 error = hammer2_xop_collect(&xop4->head, 0); 2197 error = hammer2_error_to_errno(error); 2198 hammer2_xop_retire(&xop4->head, HAMMER2_XOPMASK_VOP); 2199 2200 if (error == ENOENT) 2201 error = 0; 2202 2203 /* 2204 * Update inode meta-data. 2205 * 2206 * WARNING! The in-memory inode (ip) structure does not 2207 * maintain a copy of the inode's filename buffer. 2208 */ 2209 if (error == 0 && 2210 (ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE)) { 2211 hammer2_inode_modify(ip); 2212 ip->meta.name_len = tname_len; 2213 ip->meta.name_key = tlhc; 2214 } 2215 if (error == 0) { 2216 hammer2_inode_modify(ip); 2217 ip->meta.iparent = tdip->meta.inum; 2218 } 2219 update_fdip = 1; 2220 update_tdip = 1; 2221 } 2222 2223 done2: 2224 /* 2225 * If no error, the backend has replaced the target directory entry. 2226 * We must adjust nlinks on the original replace target if it exists. 2227 */ 2228 if (error == 0 && tip) { 2229 int isopen; 2230 2231 isopen = cache_isopen(ap->a_tnch); 2232 hammer2_inode_unlink_finisher(tip, isopen); 2233 } 2234 2235 /* 2236 * Update directory mtimes to represent the something changed. 2237 */ 2238 if (update_fdip || update_tdip) { 2239 uint64_t mtime; 2240 2241 hammer2_update_time(&mtime); 2242 if (update_fdip) { 2243 hammer2_inode_modify(fdip); 2244 fdip->meta.mtime = mtime; 2245 } 2246 if (update_tdip) { 2247 hammer2_inode_modify(tdip); 2248 tdip->meta.mtime = mtime; 2249 } 2250 } 2251 if (tip) { 2252 hammer2_inode_unlock(tip); 2253 hammer2_inode_drop(tip); 2254 } 2255 hammer2_inode_unlock(ip); 2256 hammer2_inode_unlock(tdip); 2257 hammer2_inode_unlock(fdip); 2258 hammer2_inode_drop(ip); 2259 hammer2_trans_done(tdip->pmp, 1); 2260 2261 /* 2262 * Issue the namecache update after unlocking all the internal 2263 * hammer2 structures, otherwise we might deadlock. 2264 * 2265 * WARNING! The target namespace must be updated atomically, 2266 * and we depend on cache_rename() to handle that for 2267 * us. Do not do a separate cache_unlink() because 2268 * that leaves a small window of opportunity for other 2269 * threads to allocate the target namespace before we 2270 * manage to complete our rename. 2271 * 2272 * WARNING! cache_rename() (and cache_unlink()) will properly 2273 * set VREF_FINALIZE on any attached vnode. Do not 2274 * call cache_setunresolved() manually before-hand as 2275 * this will prevent the flag from being set later via 2276 * cache_rename(). If VREF_FINALIZE is not properly set 2277 * and the inode is no longer in the topology, related 2278 * chains can remain dirty indefinitely. 2279 */ 2280 if (error == 0 && tip) { 2281 /*cache_unlink(ap->a_tnch); see above */ 2282 /*cache_setunresolved(ap->a_tnch); see above */ 2283 } 2284 if (error == 0) { 2285 cache_rename(ap->a_fnch, ap->a_tnch); 2286 hammer2_knote(ap->a_fdvp, NOTE_WRITE); 2287 hammer2_knote(ap->a_tdvp, NOTE_WRITE); 2288 hammer2_knote(fncp->nc_vp, NOTE_RENAME); 2289 } 2290 2291 return (error); 2292 } 2293 2294 /* 2295 * hammer2_vop_ioctl { vp, command, data, fflag, cred } 2296 */ 2297 static 2298 int 2299 hammer2_vop_ioctl(struct vop_ioctl_args *ap) 2300 { 2301 hammer2_inode_t *ip; 2302 int error; 2303 2304 ip = VTOI(ap->a_vp); 2305 2306 error = hammer2_ioctl(ip, ap->a_command, (void *)ap->a_data, 2307 ap->a_fflag, ap->a_cred); 2308 return (error); 2309 } 2310 2311 static 2312 int 2313 hammer2_vop_mountctl(struct vop_mountctl_args *ap) 2314 { 2315 struct mount *mp; 2316 hammer2_pfs_t *pmp; 2317 int rc; 2318 2319 switch (ap->a_op) { 2320 case (MOUNTCTL_SET_EXPORT): 2321 mp = ap->a_head.a_ops->head.vv_mount; 2322 pmp = MPTOPMP(mp); 2323 2324 if (ap->a_ctllen != sizeof(struct export_args)) 2325 rc = (EINVAL); 2326 else 2327 rc = vfs_export(mp, &pmp->export, 2328 (const struct export_args *)ap->a_ctl); 2329 break; 2330 default: 2331 rc = vop_stdmountctl(ap); 2332 break; 2333 } 2334 return (rc); 2335 } 2336 2337 /* 2338 * KQFILTER 2339 */ 2340 static void filt_hammer2detach(struct knote *kn); 2341 static int filt_hammer2read(struct knote *kn, long hint); 2342 static int filt_hammer2write(struct knote *kn, long hint); 2343 static int filt_hammer2vnode(struct knote *kn, long hint); 2344 2345 static struct filterops hammer2read_filtops = 2346 { FILTEROP_ISFD | FILTEROP_MPSAFE, 2347 NULL, filt_hammer2detach, filt_hammer2read }; 2348 static struct filterops hammer2write_filtops = 2349 { FILTEROP_ISFD | FILTEROP_MPSAFE, 2350 NULL, filt_hammer2detach, filt_hammer2write }; 2351 static struct filterops hammer2vnode_filtops = 2352 { FILTEROP_ISFD | FILTEROP_MPSAFE, 2353 NULL, filt_hammer2detach, filt_hammer2vnode }; 2354 2355 static 2356 int 2357 hammer2_vop_kqfilter(struct vop_kqfilter_args *ap) 2358 { 2359 struct vnode *vp = ap->a_vp; 2360 struct knote *kn = ap->a_kn; 2361 2362 switch (kn->kn_filter) { 2363 case EVFILT_READ: 2364 kn->kn_fop = &hammer2read_filtops; 2365 break; 2366 case EVFILT_WRITE: 2367 kn->kn_fop = &hammer2write_filtops; 2368 break; 2369 case EVFILT_VNODE: 2370 kn->kn_fop = &hammer2vnode_filtops; 2371 break; 2372 default: 2373 return (EOPNOTSUPP); 2374 } 2375 2376 kn->kn_hook = (caddr_t)vp; 2377 2378 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 2379 2380 return(0); 2381 } 2382 2383 static void 2384 filt_hammer2detach(struct knote *kn) 2385 { 2386 struct vnode *vp = (void *)kn->kn_hook; 2387 2388 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 2389 } 2390 2391 static int 2392 filt_hammer2read(struct knote *kn, long hint) 2393 { 2394 struct vnode *vp = (void *)kn->kn_hook; 2395 hammer2_inode_t *ip = VTOI(vp); 2396 off_t off; 2397 2398 if (hint == NOTE_REVOKE) { 2399 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 2400 return(1); 2401 } 2402 off = ip->meta.size - kn->kn_fp->f_offset; 2403 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 2404 if (kn->kn_sfflags & NOTE_OLDAPI) 2405 return(1); 2406 return (kn->kn_data != 0); 2407 } 2408 2409 2410 static int 2411 filt_hammer2write(struct knote *kn, long hint) 2412 { 2413 if (hint == NOTE_REVOKE) 2414 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 2415 kn->kn_data = 0; 2416 return (1); 2417 } 2418 2419 static int 2420 filt_hammer2vnode(struct knote *kn, long hint) 2421 { 2422 if (kn->kn_sfflags & hint) 2423 kn->kn_fflags |= hint; 2424 if (hint == NOTE_REVOKE) { 2425 kn->kn_flags |= (EV_EOF | EV_NODATA); 2426 return (1); 2427 } 2428 return (kn->kn_fflags != 0); 2429 } 2430 2431 /* 2432 * FIFO VOPS 2433 */ 2434 static 2435 int 2436 hammer2_vop_markatime(struct vop_markatime_args *ap) 2437 { 2438 hammer2_inode_t *ip; 2439 struct vnode *vp; 2440 2441 vp = ap->a_vp; 2442 ip = VTOI(vp); 2443 2444 if (ip->pmp->ronly) 2445 return (EROFS); 2446 return(0); 2447 } 2448 2449 static 2450 int 2451 hammer2_vop_fifokqfilter(struct vop_kqfilter_args *ap) 2452 { 2453 int error; 2454 2455 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 2456 if (error) 2457 error = hammer2_vop_kqfilter(ap); 2458 return(error); 2459 } 2460 2461 /* 2462 * VOPS vector 2463 */ 2464 struct vop_ops hammer2_vnode_vops = { 2465 .vop_default = vop_defaultop, 2466 .vop_fsync = hammer2_vop_fsync, 2467 .vop_getpages = vop_stdgetpages, 2468 .vop_putpages = vop_stdputpages, 2469 .vop_access = hammer2_vop_access, 2470 .vop_advlock = hammer2_vop_advlock, 2471 .vop_close = hammer2_vop_close, 2472 .vop_nlink = hammer2_vop_nlink, 2473 .vop_ncreate = hammer2_vop_ncreate, 2474 .vop_nsymlink = hammer2_vop_nsymlink, 2475 .vop_nremove = hammer2_vop_nremove, 2476 .vop_nrmdir = hammer2_vop_nrmdir, 2477 .vop_nrename = hammer2_vop_nrename, 2478 .vop_getattr = hammer2_vop_getattr, 2479 .vop_setattr = hammer2_vop_setattr, 2480 .vop_readdir = hammer2_vop_readdir, 2481 .vop_readlink = hammer2_vop_readlink, 2482 .vop_read = hammer2_vop_read, 2483 .vop_write = hammer2_vop_write, 2484 .vop_open = hammer2_vop_open, 2485 .vop_inactive = hammer2_vop_inactive, 2486 .vop_reclaim = hammer2_vop_reclaim, 2487 .vop_nresolve = hammer2_vop_nresolve, 2488 .vop_nlookupdotdot = hammer2_vop_nlookupdotdot, 2489 .vop_nmkdir = hammer2_vop_nmkdir, 2490 .vop_nmknod = hammer2_vop_nmknod, 2491 .vop_ioctl = hammer2_vop_ioctl, 2492 .vop_mountctl = hammer2_vop_mountctl, 2493 .vop_bmap = hammer2_vop_bmap, 2494 .vop_strategy = hammer2_vop_strategy, 2495 .vop_kqfilter = hammer2_vop_kqfilter 2496 }; 2497 2498 struct vop_ops hammer2_spec_vops = { 2499 .vop_default = vop_defaultop, 2500 .vop_fsync = hammer2_vop_fsync, 2501 .vop_read = vop_stdnoread, 2502 .vop_write = vop_stdnowrite, 2503 .vop_access = hammer2_vop_access, 2504 .vop_close = hammer2_vop_close, 2505 .vop_markatime = hammer2_vop_markatime, 2506 .vop_getattr = hammer2_vop_getattr, 2507 .vop_inactive = hammer2_vop_inactive, 2508 .vop_reclaim = hammer2_vop_reclaim, 2509 .vop_setattr = hammer2_vop_setattr 2510 }; 2511 2512 struct vop_ops hammer2_fifo_vops = { 2513 .vop_default = fifo_vnoperate, 2514 .vop_fsync = hammer2_vop_fsync, 2515 #if 0 2516 .vop_read = hammer2_vop_fiforead, 2517 .vop_write = hammer2_vop_fifowrite, 2518 #endif 2519 .vop_access = hammer2_vop_access, 2520 #if 0 2521 .vop_close = hammer2_vop_fifoclose, 2522 #endif 2523 .vop_markatime = hammer2_vop_markatime, 2524 .vop_getattr = hammer2_vop_getattr, 2525 .vop_inactive = hammer2_vop_inactive, 2526 .vop_reclaim = hammer2_vop_reclaim, 2527 .vop_setattr = hammer2_vop_setattr, 2528 .vop_kqfilter = hammer2_vop_fifokqfilter 2529 }; 2530 2531