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/mount.h> 50 #include <sys/vnode.h> 51 #include <sys/mountctl.h> 52 #include <sys/dirent.h> 53 #include <sys/uio.h> 54 #include <sys/objcache.h> 55 #include <sys/event.h> 56 #include <sys/file.h> 57 #include <vfs/fifofs/fifo.h> 58 59 #include "hammer2.h" 60 61 static int hammer2_read_file(hammer2_inode_t *ip, struct uio *uio, 62 int seqcount); 63 static int hammer2_write_file(hammer2_inode_t *ip, struct uio *uio, 64 int ioflag, int seqcount); 65 static void hammer2_extend_file(hammer2_inode_t *ip, hammer2_key_t nsize); 66 static void hammer2_truncate_file(hammer2_inode_t *ip, hammer2_key_t nsize); 67 68 /* 69 * Last reference to a vnode is going away but it is still cached. 70 */ 71 static 72 int 73 hammer2_vop_inactive(struct vop_inactive_args *ap) 74 { 75 hammer2_inode_t *ip; 76 struct vnode *vp; 77 78 vp = ap->a_vp; 79 ip = VTOI(vp); 80 81 /* 82 * Degenerate case 83 */ 84 if (ip == NULL) { 85 vrecycle(vp); 86 return (0); 87 } 88 89 /* 90 * Aquire the inode lock to interlock against vp updates via 91 * the inode path and file deletions and such (which can be 92 * namespace-only operations that might not hold the vnode). 93 */ 94 hammer2_inode_lock(ip, 0); 95 if (ip->flags & HAMMER2_INODE_ISUNLINKED) { 96 int nblksize; 97 98 /* 99 * If the inode has been unlinked we can throw away all 100 * buffers (dirty or not) and clean the file out. 101 * 102 * Because vrecycle() calls are not guaranteed, try to 103 * dispose of the inode as much as possible right here. 104 */ 105 nblksize = hammer2_calc_logical(ip, 0, NULL, NULL); 106 nvtruncbuf(vp, 0, nblksize, 0, 0); 107 108 /* 109 * Delete the file on-media. 110 */ 111 if ((ip->flags & HAMMER2_INODE_DELETING) == 0) { 112 atomic_set_int(&ip->flags, HAMMER2_INODE_DELETING); 113 hammer2_inode_delayed_sideq(ip); 114 } 115 hammer2_inode_unlock(ip); 116 117 /* 118 * Recycle immediately if possible 119 */ 120 vrecycle(vp); 121 } else { 122 hammer2_inode_unlock(ip); 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 struct vnode *vp; 137 138 vp = ap->a_vp; 139 ip = VTOI(vp); 140 if (ip == NULL) 141 return(0); 142 143 /* 144 * NOTE! We do not attempt to flush chains here, flushing is 145 * really fragile and could also deadlock. 146 */ 147 vclrisdirty(vp); 148 149 /* 150 * The inode lock is required to disconnect it. 151 */ 152 hammer2_inode_lock(ip, 0); 153 vp->v_data = NULL; 154 ip->vp = NULL; 155 156 /* 157 * Delete the file on-media. This should have been handled by the 158 * inactivation. The operation is likely still queued on the inode 159 * though so only complain if the stars don't align. 160 */ 161 if ((ip->flags & (HAMMER2_INODE_ISUNLINKED | HAMMER2_INODE_DELETING)) == 162 HAMMER2_INODE_ISUNLINKED) 163 { 164 atomic_set_int(&ip->flags, HAMMER2_INODE_DELETING); 165 hammer2_inode_delayed_sideq(ip); 166 kprintf("hammer2: vp=%p ip=%p unlinked but not disposed\n", 167 vp, ip); 168 } 169 hammer2_inode_unlock(ip); 170 171 /* 172 * Modified inodes will already be on SIDEQ or SYNCQ, no further 173 * action is needed. 174 * 175 * We cannot safely synchronize the inode from inside the reclaim 176 * due to potentially deep locks held as-of when the reclaim occurs. 177 * Interactions and potential deadlocks abound. We also can't do it 178 * here without desynchronizing from the related directory entrie(s). 179 */ 180 hammer2_inode_drop(ip); /* vp ref */ 181 182 /* 183 * XXX handle background sync when ip dirty, kernel will no longer 184 * notify us regarding this inode because there is no longer a 185 * vnode attached to it. 186 */ 187 188 return (0); 189 } 190 191 /* 192 * Currently this function synchronizes the front-end inode state to the 193 * backend chain topology, then flushes the inode's chain and sub-topology 194 * to backend media. This function does not flush the root topology down to 195 * the inode. 196 */ 197 static 198 int 199 hammer2_vop_fsync(struct vop_fsync_args *ap) 200 { 201 hammer2_inode_t *ip; 202 struct vnode *vp; 203 int error1; 204 int error2; 205 206 vp = ap->a_vp; 207 ip = VTOI(vp); 208 error1 = 0; 209 210 hammer2_trans_init(ip->pmp, 0); 211 212 /* 213 * Flush dirty buffers in the file's logical buffer cache. 214 * It is best to wait for the strategy code to commit the 215 * buffers to the device's backing buffer cache before 216 * then trying to flush the inode. 217 * 218 * This should be quick, but certain inode modifications cached 219 * entirely in the hammer2_inode structure may not trigger a 220 * buffer read until the flush so the fsync can wind up also 221 * doing scattered reads. 222 */ 223 vfsync(vp, ap->a_waitfor, 1, NULL, NULL); 224 bio_track_wait(&vp->v_track_write, 0, 0); 225 226 /* 227 * Flush any inode changes 228 */ 229 hammer2_inode_lock(ip, 0); 230 if (ip->flags & (HAMMER2_INODE_RESIZED|HAMMER2_INODE_MODIFIED)) 231 error1 = hammer2_inode_chain_sync(ip); 232 233 /* 234 * Flush dirty chains related to the inode. 235 * 236 * NOTE! We are not in a flush transaction. The inode remains on 237 * the sideq so the filesystem syncer can synchronize it to 238 * the volume root. 239 */ 240 error2 = hammer2_inode_chain_flush(ip, HAMMER2_XOP_INODE_STOP); 241 if (error2) 242 error1 = error2; 243 244 /* 245 * We may be able to clear the vnode dirty flag. 246 */ 247 if ((ip->flags & (HAMMER2_INODE_MODIFIED | 248 HAMMER2_INODE_RESIZED | 249 HAMMER2_INODE_DIRTYDATA)) == 0 && 250 RB_EMPTY(&vp->v_rbdirty_tree) && 251 !bio_track_active(&vp->v_track_write)) { 252 vclrisdirty(vp); 253 } 254 hammer2_inode_unlock(ip); 255 hammer2_trans_done(ip->pmp, 0); 256 257 return (error1); 258 } 259 260 /* 261 * No lock needed, just handle ip->update 262 */ 263 static 264 int 265 hammer2_vop_access(struct vop_access_args *ap) 266 { 267 hammer2_inode_t *ip = VTOI(ap->a_vp); 268 uid_t uid; 269 gid_t gid; 270 mode_t mode; 271 uint32_t uflags; 272 int error; 273 int update; 274 275 retry: 276 update = spin_access_start(&ip->cluster_spin); 277 278 /*hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);*/ 279 uid = hammer2_to_unix_xid(&ip->meta.uid); 280 gid = hammer2_to_unix_xid(&ip->meta.gid); 281 mode = ip->meta.mode; 282 uflags = ip->meta.uflags; 283 /*hammer2_inode_unlock(ip);*/ 284 285 if (__predict_false(spin_access_end(&ip->cluster_spin, update))) 286 goto retry; 287 288 error = vop_helper_access(ap, uid, gid, mode, uflags); 289 290 return (error); 291 } 292 293 static 294 int 295 hammer2_vop_getattr(struct vop_getattr_args *ap) 296 { 297 hammer2_pfs_t *pmp; 298 hammer2_inode_t *ip; 299 struct vnode *vp; 300 struct vattr *vap; 301 int update; 302 303 vp = ap->a_vp; 304 vap = ap->a_vap; 305 306 ip = VTOI(vp); 307 pmp = ip->pmp; 308 309 retry: 310 update = spin_access_start(&ip->cluster_spin); 311 312 vap->va_fsid = pmp->mp->mnt_stat.f_fsid.val[0]; 313 vap->va_fileid = ip->meta.inum; 314 vap->va_mode = ip->meta.mode; 315 vap->va_nlink = ip->meta.nlinks; 316 vap->va_uid = hammer2_to_unix_xid(&ip->meta.uid); 317 vap->va_gid = hammer2_to_unix_xid(&ip->meta.gid); 318 vap->va_rmajor = 0; 319 vap->va_rminor = 0; 320 vap->va_size = ip->meta.size; /* protected by shared lock */ 321 vap->va_blocksize = HAMMER2_PBUFSIZE; 322 vap->va_flags = ip->meta.uflags; 323 hammer2_time_to_timespec(ip->meta.ctime, &vap->va_ctime); 324 hammer2_time_to_timespec(ip->meta.mtime, &vap->va_mtime); 325 hammer2_time_to_timespec(ip->meta.mtime, &vap->va_atime); 326 vap->va_gen = 1; 327 vap->va_bytes = 0; 328 if (ip->meta.type == HAMMER2_OBJTYPE_DIRECTORY) { 329 /* 330 * Can't really calculate directory use sans the files under 331 * it, just assume one block for now. 332 */ 333 vap->va_bytes += HAMMER2_INODE_BYTES; 334 } else { 335 vap->va_bytes = hammer2_inode_data_count(ip); 336 } 337 vap->va_type = hammer2_get_vtype(ip->meta.type); 338 vap->va_filerev = 0; 339 vap->va_uid_uuid = ip->meta.uid; 340 vap->va_gid_uuid = ip->meta.gid; 341 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID | 342 VA_FSID_UUID_VALID; 343 344 if (__predict_false(spin_access_end(&ip->cluster_spin, update))) 345 goto retry; 346 347 return (0); 348 } 349 350 static 351 int 352 hammer2_vop_getattr_lite(struct vop_getattr_lite_args *ap) 353 { 354 hammer2_pfs_t *pmp; 355 hammer2_inode_t *ip; 356 struct vnode *vp; 357 struct vattr_lite *lvap; 358 int update; 359 360 vp = ap->a_vp; 361 lvap = ap->a_lvap; 362 363 ip = VTOI(vp); 364 pmp = ip->pmp; 365 366 retry: 367 update = spin_access_start(&ip->cluster_spin); 368 369 #if 0 370 vap->va_fsid = pmp->mp->mnt_stat.f_fsid.val[0]; 371 vap->va_fileid = ip->meta.inum; 372 #endif 373 lvap->va_mode = ip->meta.mode; 374 lvap->va_nlink = ip->meta.nlinks; 375 lvap->va_uid = hammer2_to_unix_xid(&ip->meta.uid); 376 lvap->va_gid = hammer2_to_unix_xid(&ip->meta.gid); 377 #if 0 378 vap->va_rmajor = 0; 379 vap->va_rminor = 0; 380 #endif 381 lvap->va_size = ip->meta.size; 382 #if 0 383 vap->va_blocksize = HAMMER2_PBUFSIZE; 384 #endif 385 lvap->va_flags = ip->meta.uflags; 386 lvap->va_type = hammer2_get_vtype(ip->meta.type); 387 #if 0 388 vap->va_filerev = 0; 389 vap->va_uid_uuid = ip->meta.uid; 390 vap->va_gid_uuid = ip->meta.gid; 391 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID | 392 VA_FSID_UUID_VALID; 393 #endif 394 395 if (__predict_false(spin_access_end(&ip->cluster_spin, update))) 396 goto retry; 397 398 return (0); 399 } 400 401 static 402 int 403 hammer2_vop_setattr(struct vop_setattr_args *ap) 404 { 405 hammer2_inode_t *ip; 406 struct vnode *vp; 407 struct vattr *vap; 408 int error; 409 int kflags = 0; 410 uint64_t ctime; 411 412 vp = ap->a_vp; 413 vap = ap->a_vap; 414 hammer2_update_time(&ctime); 415 416 ip = VTOI(vp); 417 418 if (ip->pmp->ronly) 419 return (EROFS); 420 421 /* 422 * Normally disallow setattr if there is no space, unless we 423 * are in emergency mode (might be needed to chflags -R noschg 424 * files prior to removal). 425 */ 426 if ((ip->pmp->flags & HAMMER2_PMPF_EMERG) == 0 && 427 hammer2_vfs_enospace(ip, 0, ap->a_cred) > 1) { 428 return (ENOSPC); 429 } 430 431 hammer2_trans_init(ip->pmp, 0); 432 hammer2_inode_lock(ip, 0); 433 error = 0; 434 435 if (vap->va_flags != VNOVAL) { 436 uint32_t flags; 437 438 flags = ip->meta.uflags; 439 error = vop_helper_setattr_flags(&flags, vap->va_flags, 440 hammer2_to_unix_xid(&ip->meta.uid), 441 ap->a_cred); 442 if (error == 0) { 443 if (ip->meta.uflags != flags) { 444 hammer2_inode_modify(ip); 445 hammer2_spin_lock_update(&ip->cluster_spin); 446 ip->meta.uflags = flags; 447 ip->meta.ctime = ctime; 448 hammer2_spin_unlock_update(&ip->cluster_spin); 449 kflags |= NOTE_ATTRIB; 450 } 451 if (ip->meta.uflags & (IMMUTABLE | APPEND)) { 452 error = 0; 453 goto done; 454 } 455 } 456 goto done; 457 } 458 if (ip->meta.uflags & (IMMUTABLE | APPEND)) { 459 error = EPERM; 460 goto done; 461 } 462 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 463 mode_t cur_mode = ip->meta.mode; 464 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid); 465 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid); 466 uuid_t uuid_uid; 467 uuid_t uuid_gid; 468 469 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid, 470 ap->a_cred, 471 &cur_uid, &cur_gid, &cur_mode); 472 if (error == 0) { 473 hammer2_guid_to_uuid(&uuid_uid, cur_uid); 474 hammer2_guid_to_uuid(&uuid_gid, cur_gid); 475 if (bcmp(&uuid_uid, &ip->meta.uid, sizeof(uuid_uid)) || 476 bcmp(&uuid_gid, &ip->meta.gid, sizeof(uuid_gid)) || 477 ip->meta.mode != cur_mode 478 ) { 479 hammer2_inode_modify(ip); 480 hammer2_spin_lock_update(&ip->cluster_spin); 481 ip->meta.uid = uuid_uid; 482 ip->meta.gid = uuid_gid; 483 ip->meta.mode = cur_mode; 484 ip->meta.ctime = ctime; 485 hammer2_spin_unlock_update(&ip->cluster_spin); 486 } 487 kflags |= NOTE_ATTRIB; 488 } 489 } 490 491 /* 492 * Resize the file 493 */ 494 if (vap->va_size != VNOVAL && ip->meta.size != vap->va_size) { 495 switch(vp->v_type) { 496 case VREG: 497 if (vap->va_size == ip->meta.size) 498 break; 499 if (vap->va_size < ip->meta.size) { 500 hammer2_mtx_ex(&ip->truncate_lock); 501 hammer2_truncate_file(ip, vap->va_size); 502 hammer2_mtx_unlock(&ip->truncate_lock); 503 kflags |= NOTE_WRITE; 504 } else { 505 hammer2_extend_file(ip, vap->va_size); 506 kflags |= NOTE_WRITE | NOTE_EXTEND; 507 } 508 hammer2_inode_modify(ip); 509 ip->meta.mtime = ctime; 510 vclrflags(vp, VLASTWRITETS); 511 break; 512 default: 513 error = EINVAL; 514 goto done; 515 } 516 } 517 #if 0 518 /* atime not supported */ 519 if (vap->va_atime.tv_sec != VNOVAL) { 520 hammer2_inode_modify(ip); 521 ip->meta.atime = hammer2_timespec_to_time(&vap->va_atime); 522 kflags |= NOTE_ATTRIB; 523 } 524 #endif 525 if (vap->va_mode != (mode_t)VNOVAL) { 526 mode_t cur_mode = ip->meta.mode; 527 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid); 528 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid); 529 530 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred, 531 cur_uid, cur_gid, &cur_mode); 532 if (error == 0) { 533 hammer2_inode_modify(ip); 534 hammer2_spin_lock_update(&ip->cluster_spin); 535 ip->meta.mode = cur_mode; 536 ip->meta.ctime = ctime; 537 hammer2_spin_unlock_update(&ip->cluster_spin); 538 kflags |= NOTE_ATTRIB; 539 } 540 } 541 542 if (vap->va_mtime.tv_sec != VNOVAL) { 543 hammer2_inode_modify(ip); 544 ip->meta.mtime = hammer2_timespec_to_time(&vap->va_mtime); 545 kflags |= NOTE_ATTRIB; 546 vclrflags(vp, VLASTWRITETS); 547 } 548 549 done: 550 /* 551 * If a truncation occurred we must call chain_sync() now in order 552 * to trim the related data chains, otherwise a later expansion can 553 * cause havoc. 554 * 555 * If an extend occured that changed the DIRECTDATA state, we must 556 * call inode_chain_sync now in order to prepare the inode's indirect 557 * block table. 558 * 559 * WARNING! This means we are making an adjustment to the inode's 560 * chain outside of sync/fsync, and not just to inode->meta, which 561 * may result in some consistency issues if a crash were to occur 562 * at just the wrong time. 563 */ 564 if (ip->flags & HAMMER2_INODE_RESIZED) 565 hammer2_inode_chain_sync(ip); 566 567 /* 568 * Cleanup. 569 */ 570 hammer2_inode_unlock(ip); 571 hammer2_trans_done(ip->pmp, HAMMER2_TRANS_SIDEQ); 572 hammer2_knote(ip->vp, kflags); 573 574 return (error); 575 } 576 577 static 578 int 579 hammer2_vop_readdir(struct vop_readdir_args *ap) 580 { 581 hammer2_xop_readdir_t *xop; 582 hammer2_blockref_t bref; 583 hammer2_inode_t *ip; 584 hammer2_tid_t inum; 585 hammer2_key_t lkey; 586 struct uio *uio; 587 off_t *cookies; 588 off_t saveoff; 589 int cookie_index; 590 int ncookies; 591 int error; 592 int eofflag; 593 int r; 594 595 ip = VTOI(ap->a_vp); 596 uio = ap->a_uio; 597 saveoff = uio->uio_offset; 598 eofflag = 0; 599 error = 0; 600 601 /* 602 * Setup cookies directory entry cookies if requested 603 */ 604 if (ap->a_ncookies) { 605 ncookies = uio->uio_resid / 16 + 1; 606 if (ncookies > 1024) 607 ncookies = 1024; 608 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 609 } else { 610 ncookies = -1; 611 cookies = NULL; 612 } 613 cookie_index = 0; 614 615 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED); 616 617 /* 618 * Handle artificial entries. To ensure that only positive 64 bit 619 * quantities are returned to userland we always strip off bit 63. 620 * The hash code is designed such that codes 0x0000-0x7FFF are not 621 * used, allowing us to use these codes for articial entries. 622 * 623 * Entry 0 is used for '.' and entry 1 is used for '..'. Do not 624 * allow '..' to cross the mount point into (e.g.) the super-root. 625 */ 626 if (saveoff == 0) { 627 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK; 628 r = vop_write_dirent(&error, uio, inum, DT_DIR, 1, "."); 629 if (r) 630 goto done; 631 if (cookies) 632 cookies[cookie_index] = saveoff; 633 ++saveoff; 634 ++cookie_index; 635 if (cookie_index == ncookies) 636 goto done; 637 } 638 639 if (saveoff == 1) { 640 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK; 641 if (ip != ip->pmp->iroot) 642 inum = ip->meta.iparent & HAMMER2_DIRHASH_USERMSK; 643 r = vop_write_dirent(&error, uio, inum, DT_DIR, 2, ".."); 644 if (r) 645 goto done; 646 if (cookies) 647 cookies[cookie_index] = saveoff; 648 ++saveoff; 649 ++cookie_index; 650 if (cookie_index == ncookies) 651 goto done; 652 } 653 654 lkey = saveoff | HAMMER2_DIRHASH_VISIBLE; 655 if (hammer2_debug & 0x0020) 656 kprintf("readdir: lkey %016jx\n", lkey); 657 if (error) 658 goto done; 659 660 xop = hammer2_xop_alloc(ip, 0); 661 xop->lkey = lkey; 662 hammer2_xop_start(&xop->head, &hammer2_readdir_desc); 663 664 for (;;) { 665 const hammer2_inode_data_t *ripdata; 666 const char *dname; 667 int dtype; 668 669 error = hammer2_xop_collect(&xop->head, 0); 670 error = hammer2_error_to_errno(error); 671 if (error) { 672 break; 673 } 674 if (cookie_index == ncookies) 675 break; 676 if (hammer2_debug & 0x0020) 677 kprintf("cluster chain %p %p\n", 678 xop->head.cluster.focus, 679 (xop->head.cluster.focus ? 680 xop->head.cluster.focus->data : (void *)-1)); 681 hammer2_cluster_bref(&xop->head.cluster, &bref); 682 683 if (bref.type == HAMMER2_BREF_TYPE_INODE) { 684 ripdata = &hammer2_xop_gdata(&xop->head)->ipdata; 685 dtype = hammer2_get_dtype(ripdata->meta.type); 686 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK; 687 r = vop_write_dirent(&error, uio, 688 ripdata->meta.inum & 689 HAMMER2_DIRHASH_USERMSK, 690 dtype, 691 ripdata->meta.name_len, 692 ripdata->filename); 693 hammer2_xop_pdata(&xop->head); 694 if (r) 695 break; 696 if (cookies) 697 cookies[cookie_index] = saveoff; 698 ++cookie_index; 699 } else if (bref.type == HAMMER2_BREF_TYPE_DIRENT) { 700 uint16_t namlen; 701 702 dtype = hammer2_get_dtype(bref.embed.dirent.type); 703 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK; 704 namlen = bref.embed.dirent.namlen; 705 if (namlen <= sizeof(bref.check.buf)) { 706 dname = bref.check.buf; 707 } else { 708 dname = hammer2_xop_gdata(&xop->head)->buf; 709 } 710 r = vop_write_dirent(&error, uio, 711 bref.embed.dirent.inum, dtype, 712 namlen, dname); 713 if (namlen > sizeof(bref.check.buf)) 714 hammer2_xop_pdata(&xop->head); 715 if (r) 716 break; 717 if (cookies) 718 cookies[cookie_index] = saveoff; 719 ++cookie_index; 720 } else { 721 /* XXX chain error */ 722 kprintf("bad chain type readdir %d\n", bref.type); 723 } 724 } 725 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 726 if (error == ENOENT) { 727 error = 0; 728 eofflag = 1; 729 saveoff = (hammer2_key_t)-1; 730 } else { 731 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK; 732 } 733 done: 734 hammer2_inode_unlock(ip); 735 if (ap->a_eofflag) 736 *ap->a_eofflag = eofflag; 737 if (hammer2_debug & 0x0020) 738 kprintf("readdir: done at %016jx\n", saveoff); 739 uio->uio_offset = saveoff & ~HAMMER2_DIRHASH_VISIBLE; 740 if (error && cookie_index == 0) { 741 if (cookies) { 742 kfree(cookies, M_TEMP); 743 *ap->a_ncookies = 0; 744 *ap->a_cookies = NULL; 745 } 746 } else { 747 if (cookies) { 748 *ap->a_ncookies = cookie_index; 749 *ap->a_cookies = cookies; 750 } 751 } 752 return (error); 753 } 754 755 /* 756 * hammer2_vop_readlink { vp, uio, cred } 757 */ 758 static 759 int 760 hammer2_vop_readlink(struct vop_readlink_args *ap) 761 { 762 struct vnode *vp; 763 hammer2_inode_t *ip; 764 int error; 765 766 vp = ap->a_vp; 767 if (vp->v_type != VLNK) 768 return (EINVAL); 769 ip = VTOI(vp); 770 771 error = hammer2_read_file(ip, ap->a_uio, 0); 772 return (error); 773 } 774 775 static 776 int 777 hammer2_vop_read(struct vop_read_args *ap) 778 { 779 struct vnode *vp; 780 hammer2_inode_t *ip; 781 struct uio *uio; 782 int error; 783 int seqcount; 784 785 /* 786 * Read operations supported on this vnode? 787 */ 788 vp = ap->a_vp; 789 if (vp->v_type == VDIR) 790 return (EISDIR); 791 if (vp->v_type != VREG) 792 return (EINVAL); 793 794 /* 795 * Misc 796 */ 797 ip = VTOI(vp); 798 uio = ap->a_uio; 799 error = 0; 800 801 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 802 803 error = hammer2_read_file(ip, uio, seqcount); 804 return (error); 805 } 806 807 static 808 int 809 hammer2_vop_write(struct vop_write_args *ap) 810 { 811 hammer2_inode_t *ip; 812 thread_t td; 813 struct vnode *vp; 814 struct uio *uio; 815 int error; 816 int seqcount; 817 int ioflag; 818 819 /* 820 * Read operations supported on this vnode? 821 */ 822 vp = ap->a_vp; 823 if (vp->v_type != VREG) 824 return (EINVAL); 825 826 /* 827 * Misc 828 */ 829 ip = VTOI(vp); 830 ioflag = ap->a_ioflag; 831 uio = ap->a_uio; 832 error = 0; 833 if (ip->pmp->ronly || (ip->pmp->flags & HAMMER2_PMPF_EMERG)) 834 return (EROFS); 835 switch (hammer2_vfs_enospace(ip, uio->uio_resid, ap->a_cred)) { 836 case 2: 837 return (ENOSPC); 838 case 1: 839 ioflag |= IO_DIRECT; /* semi-synchronous */ 840 /* fall through */ 841 default: 842 break; 843 } 844 845 seqcount = ioflag >> IO_SEQSHIFT; 846 847 /* 848 * Check resource limit 849 */ 850 if (uio->uio_resid > 0 && (td = uio->uio_td) != NULL && td->td_proc && 851 uio->uio_offset + uio->uio_resid > 852 td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 853 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ); 854 return (EFBIG); 855 } 856 857 /* 858 * The transaction interlocks against flush initiations 859 * (note: but will run concurrently with the actual flush). 860 * 861 * To avoid deadlocking against the VM system, we must flag any 862 * transaction related to the buffer cache or other direct 863 * VM page manipulation. 864 */ 865 if (uio->uio_segflg == UIO_NOCOPY) { 866 hammer2_trans_init(ip->pmp, HAMMER2_TRANS_BUFCACHE); 867 } else { 868 hammer2_trans_init(ip->pmp, 0); 869 } 870 error = hammer2_write_file(ip, uio, ioflag, seqcount); 871 if (uio->uio_segflg == UIO_NOCOPY) 872 hammer2_trans_done(ip->pmp, HAMMER2_TRANS_BUFCACHE | 873 HAMMER2_TRANS_SIDEQ); 874 else 875 hammer2_trans_done(ip->pmp, HAMMER2_TRANS_SIDEQ); 876 877 return (error); 878 } 879 880 /* 881 * Perform read operations on a file or symlink given an UNLOCKED 882 * inode and uio. 883 * 884 * The passed ip is not locked. 885 */ 886 static 887 int 888 hammer2_read_file(hammer2_inode_t *ip, struct uio *uio, int seqcount) 889 { 890 hammer2_off_t size; 891 struct buf *bp; 892 int error; 893 894 error = 0; 895 896 /* 897 * UIO read loop. 898 * 899 * WARNING! Assumes that the kernel interlocks size changes at the 900 * vnode level. 901 */ 902 hammer2_mtx_sh(&ip->lock); 903 hammer2_mtx_sh(&ip->truncate_lock); 904 size = ip->meta.size; 905 hammer2_mtx_unlock(&ip->lock); 906 907 while (uio->uio_resid > 0 && uio->uio_offset < size) { 908 hammer2_key_t lbase; 909 hammer2_key_t leof; 910 int lblksize; 911 int loff; 912 int n; 913 914 lblksize = hammer2_calc_logical(ip, uio->uio_offset, 915 &lbase, &leof); 916 917 #if 1 918 bp = NULL; 919 error = cluster_readx(ip->vp, leof, lbase, lblksize, 920 B_NOTMETA | B_KVABIO, 921 uio->uio_resid, 922 seqcount * MAXBSIZE, 923 &bp); 924 #else 925 if (uio->uio_segflg == UIO_NOCOPY) { 926 bp = getblk(ip->vp, lbase, lblksize, 927 GETBLK_BHEAVY | GETBLK_KVABIO, 0); 928 if (bp->b_flags & B_CACHE) { 929 int i; 930 int j = 0; 931 if (bp->b_xio.xio_npages != 16) 932 kprintf("NPAGES BAD\n"); 933 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 934 vm_page_t m; 935 m = bp->b_xio.xio_pages[i]; 936 if (m == NULL || m->valid == 0) { 937 kprintf("bp %016jx %016jx pg %d inv", 938 lbase, leof, i); 939 if (m) 940 kprintf("m->object %p/%p", m->object, ip->vp->v_object); 941 kprintf("\n"); 942 j = 1; 943 } 944 } 945 if (j) 946 kprintf("b_flags %08x, b_error %d\n", bp->b_flags, bp->b_error); 947 } 948 bqrelse(bp); 949 } 950 error = bread_kvabio(ip->vp, lbase, lblksize, &bp); 951 #endif 952 if (error) { 953 brelse(bp); 954 break; 955 } 956 bkvasync(bp); 957 loff = (int)(uio->uio_offset - lbase); 958 n = lblksize - loff; 959 if (n > uio->uio_resid) 960 n = uio->uio_resid; 961 if (n > size - uio->uio_offset) 962 n = (int)(size - uio->uio_offset); 963 bp->b_flags |= B_AGE; 964 uiomovebp(bp, bp->b_data + loff, n, uio); 965 bqrelse(bp); 966 } 967 hammer2_mtx_unlock(&ip->truncate_lock); 968 969 return (error); 970 } 971 972 /* 973 * Write to the file represented by the inode via the logical buffer cache. 974 * The inode may represent a regular file or a symlink. 975 * 976 * The inode must not be locked. 977 */ 978 static 979 int 980 hammer2_write_file(hammer2_inode_t *ip, struct uio *uio, 981 int ioflag, int seqcount) 982 { 983 hammer2_key_t old_eof; 984 hammer2_key_t new_eof; 985 struct buf *bp; 986 int kflags; 987 int error; 988 int modified; 989 990 /* 991 * Setup if append 992 * 993 * WARNING! Assumes that the kernel interlocks size changes at the 994 * vnode level. 995 */ 996 hammer2_mtx_ex(&ip->lock); 997 hammer2_mtx_sh(&ip->truncate_lock); 998 if (ioflag & IO_APPEND) 999 uio->uio_offset = ip->meta.size; 1000 old_eof = ip->meta.size; 1001 1002 /* 1003 * Extend the file if necessary. If the write fails at some point 1004 * we will truncate it back down to cover as much as we were able 1005 * to write. 1006 * 1007 * Doing this now makes it easier to calculate buffer sizes in 1008 * the loop. 1009 */ 1010 kflags = 0; 1011 error = 0; 1012 modified = 0; 1013 1014 if (uio->uio_offset + uio->uio_resid > old_eof) { 1015 new_eof = uio->uio_offset + uio->uio_resid; 1016 modified = 1; 1017 hammer2_extend_file(ip, new_eof); 1018 kflags |= NOTE_EXTEND; 1019 } else { 1020 new_eof = old_eof; 1021 } 1022 hammer2_mtx_unlock(&ip->lock); 1023 1024 /* 1025 * UIO write loop 1026 */ 1027 while (uio->uio_resid > 0) { 1028 hammer2_key_t lbase; 1029 int trivial; 1030 int endofblk; 1031 int lblksize; 1032 int loff; 1033 int n; 1034 1035 /* 1036 * Don't allow the buffer build to blow out the buffer 1037 * cache. 1038 */ 1039 if ((ioflag & IO_RECURSE) == 0) 1040 bwillwrite(HAMMER2_PBUFSIZE); 1041 1042 /* 1043 * This nominally tells us how much we can cluster and 1044 * what the logical buffer size needs to be. Currently 1045 * we don't try to cluster the write and just handle one 1046 * block at a time. 1047 */ 1048 lblksize = hammer2_calc_logical(ip, uio->uio_offset, 1049 &lbase, NULL); 1050 loff = (int)(uio->uio_offset - lbase); 1051 1052 KKASSERT(lblksize <= MAXBSIZE); 1053 1054 /* 1055 * Calculate bytes to copy this transfer and whether the 1056 * copy completely covers the buffer or not. 1057 */ 1058 trivial = 0; 1059 n = lblksize - loff; 1060 if (n > uio->uio_resid) { 1061 n = uio->uio_resid; 1062 if (loff == lbase && uio->uio_offset + n == new_eof) 1063 trivial = 1; 1064 endofblk = 0; 1065 } else { 1066 if (loff == 0) 1067 trivial = 1; 1068 endofblk = 1; 1069 } 1070 if (lbase >= new_eof) 1071 trivial = 1; 1072 1073 /* 1074 * Get the buffer 1075 */ 1076 if (uio->uio_segflg == UIO_NOCOPY) { 1077 /* 1078 * Issuing a write with the same data backing the 1079 * buffer. Instantiate the buffer to collect the 1080 * backing vm pages, then read-in any missing bits. 1081 * 1082 * This case is used by vop_stdputpages(). 1083 */ 1084 bp = getblk(ip->vp, lbase, lblksize, 1085 GETBLK_BHEAVY | GETBLK_KVABIO, 0); 1086 if ((bp->b_flags & B_CACHE) == 0) { 1087 bqrelse(bp); 1088 error = bread_kvabio(ip->vp, lbase, 1089 lblksize, &bp); 1090 } 1091 } else if (trivial) { 1092 /* 1093 * Even though we are entirely overwriting the buffer 1094 * we may still have to zero it out to avoid a 1095 * mmap/write visibility issue. 1096 */ 1097 bp = getblk(ip->vp, lbase, lblksize, 1098 GETBLK_BHEAVY | GETBLK_KVABIO, 0); 1099 if ((bp->b_flags & B_CACHE) == 0) 1100 vfs_bio_clrbuf(bp); 1101 } else { 1102 /* 1103 * Partial overwrite, read in any missing bits then 1104 * replace the portion being written. 1105 * 1106 * (The strategy code will detect zero-fill physical 1107 * blocks for this case). 1108 */ 1109 error = bread_kvabio(ip->vp, lbase, lblksize, &bp); 1110 if (error == 0) 1111 bheavy(bp); 1112 } 1113 1114 if (error) { 1115 brelse(bp); 1116 break; 1117 } 1118 1119 /* 1120 * Ok, copy the data in 1121 */ 1122 bkvasync(bp); 1123 error = uiomovebp(bp, bp->b_data + loff, n, uio); 1124 kflags |= NOTE_WRITE; 1125 modified = 1; 1126 if (error) { 1127 brelse(bp); 1128 break; 1129 } 1130 1131 /* 1132 * WARNING: Pageout daemon will issue UIO_NOCOPY writes 1133 * with IO_SYNC or IO_ASYNC set. These writes 1134 * must be handled as the pageout daemon expects. 1135 * 1136 * NOTE! H2 relies on cluster_write() here because it 1137 * cannot preallocate disk blocks at the logical 1138 * level due to not knowing what the compression 1139 * size will be at this time. 1140 * 1141 * We must use cluster_write() here and we depend 1142 * on the write-behind feature to flush buffers 1143 * appropriately. If we let the buffer daemons do 1144 * it the block allocations will be all over the 1145 * map. 1146 */ 1147 if (ioflag & IO_SYNC) { 1148 bwrite(bp); 1149 } else if ((ioflag & IO_DIRECT) && endofblk) { 1150 bawrite(bp); 1151 } else if (ioflag & IO_ASYNC) { 1152 bawrite(bp); 1153 } else if (ip->vp->v_mount->mnt_flag & MNT_NOCLUSTERW) { 1154 bdwrite(bp); 1155 } else { 1156 #if 1 1157 bp->b_flags |= B_CLUSTEROK; 1158 cluster_write(bp, new_eof, lblksize, seqcount); 1159 #else 1160 bp->b_flags |= B_CLUSTEROK; 1161 bdwrite(bp); 1162 #endif 1163 } 1164 } 1165 1166 /* 1167 * Cleanup. If we extended the file EOF but failed to write through 1168 * the entire write is a failure and we have to back-up. 1169 */ 1170 if (error && new_eof != old_eof) { 1171 hammer2_mtx_unlock(&ip->truncate_lock); 1172 hammer2_mtx_ex(&ip->lock); /* note lock order */ 1173 hammer2_mtx_ex(&ip->truncate_lock); /* note lock order */ 1174 hammer2_truncate_file(ip, old_eof); 1175 if (ip->flags & HAMMER2_INODE_MODIFIED) 1176 hammer2_inode_chain_sync(ip); 1177 hammer2_mtx_unlock(&ip->lock); 1178 } else if (modified) { 1179 struct vnode *vp = ip->vp; 1180 1181 hammer2_mtx_ex(&ip->lock); 1182 hammer2_inode_modify(ip); 1183 if (uio->uio_segflg == UIO_NOCOPY) { 1184 if (vp->v_flag & VLASTWRITETS) { 1185 ip->meta.mtime = 1186 (unsigned long)vp->v_lastwrite_ts.tv_sec * 1187 1000000 + 1188 vp->v_lastwrite_ts.tv_nsec / 1000; 1189 } 1190 } else { 1191 hammer2_update_time(&ip->meta.mtime); 1192 vclrflags(vp, VLASTWRITETS); 1193 } 1194 1195 #if 0 1196 /* 1197 * REMOVED - handled by hammer2_extend_file(). Do not issue 1198 * a chain_sync() outside of a sync/fsync except for DIRECTDATA 1199 * state changes. 1200 * 1201 * Under normal conditions we only issue a chain_sync if 1202 * the inode's DIRECTDATA state changed. 1203 */ 1204 if (ip->flags & HAMMER2_INODE_RESIZED) 1205 hammer2_inode_chain_sync(ip); 1206 #endif 1207 hammer2_mtx_unlock(&ip->lock); 1208 hammer2_knote(ip->vp, kflags); 1209 } 1210 hammer2_trans_assert_strategy(ip->pmp); 1211 hammer2_mtx_unlock(&ip->truncate_lock); 1212 1213 return error; 1214 } 1215 1216 /* 1217 * Truncate the size of a file. The inode must be locked. 1218 * 1219 * We must unconditionally set HAMMER2_INODE_RESIZED to properly 1220 * ensure that any on-media data beyond the new file EOF has been destroyed. 1221 * 1222 * WARNING: nvtruncbuf() can only be safely called without the inode lock 1223 * held due to the way our write thread works. If the truncation 1224 * occurs in the middle of a buffer, nvtruncbuf() is responsible 1225 * for dirtying that buffer and zeroing out trailing bytes. 1226 * 1227 * WARNING! Assumes that the kernel interlocks size changes at the 1228 * vnode level. 1229 * 1230 * WARNING! Caller assumes responsibility for removing dead blocks 1231 * if INODE_RESIZED is set. 1232 */ 1233 static 1234 void 1235 hammer2_truncate_file(hammer2_inode_t *ip, hammer2_key_t nsize) 1236 { 1237 int nblksize; 1238 1239 hammer2_mtx_unlock(&ip->lock); 1240 if (ip->vp) { 1241 nblksize = hammer2_calc_logical(ip, 0, NULL, NULL); 1242 nvtruncbuf(ip->vp, nsize, 1243 nblksize, (int)nsize & (nblksize - 1), 1244 0); 1245 } 1246 hammer2_mtx_ex(&ip->lock); 1247 KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0); 1248 ip->osize = ip->meta.size; 1249 ip->meta.size = nsize; 1250 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED); 1251 hammer2_inode_modify(ip); 1252 } 1253 1254 /* 1255 * Extend the size of a file. The inode must be locked. 1256 * 1257 * Even though the file size is changing, we do not have to set the 1258 * INODE_RESIZED bit unless the file size crosses the EMBEDDED_BYTES 1259 * boundary. When this occurs a hammer2_inode_chain_sync() is required 1260 * to prepare the inode cluster's indirect block table, otherwise 1261 * async execution of the strategy code will implode on us. 1262 * 1263 * WARNING! Assumes that the kernel interlocks size changes at the 1264 * vnode level. 1265 * 1266 * WARNING! Caller assumes responsibility for transitioning out 1267 * of the inode DIRECTDATA mode if INODE_RESIZED is set. 1268 */ 1269 static 1270 void 1271 hammer2_extend_file(hammer2_inode_t *ip, hammer2_key_t nsize) 1272 { 1273 hammer2_key_t osize; 1274 int oblksize; 1275 int nblksize; 1276 int error; 1277 1278 KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0); 1279 hammer2_inode_modify(ip); 1280 osize = ip->meta.size; 1281 ip->osize = osize; 1282 ip->meta.size = nsize; 1283 1284 /* 1285 * We must issue a chain_sync() when the DIRECTDATA state changes 1286 * to prevent confusion between the flush code and the in-memory 1287 * state. This is not perfect because we are doing it outside of 1288 * a sync/fsync operation, so it might not be fully synchronized 1289 * with the meta-data topology flush. 1290 * 1291 * We must retain and re-dirty the buffer cache buffer containing 1292 * the direct data so it can be written to a real block. It should 1293 * not be possible for a bread error to occur since the original data 1294 * is extracted from the inode structure directly. 1295 */ 1296 if (osize <= HAMMER2_EMBEDDED_BYTES && nsize > HAMMER2_EMBEDDED_BYTES) { 1297 if (osize) { 1298 struct buf *bp; 1299 1300 oblksize = hammer2_calc_logical(ip, 0, NULL, NULL); 1301 error = bread_kvabio(ip->vp, 0, oblksize, &bp); 1302 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED); 1303 hammer2_inode_chain_sync(ip); 1304 if (error == 0) { 1305 bheavy(bp); 1306 bdwrite(bp); 1307 } else { 1308 brelse(bp); 1309 } 1310 } else { 1311 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED); 1312 hammer2_inode_chain_sync(ip); 1313 } 1314 } 1315 hammer2_mtx_unlock(&ip->lock); 1316 if (ip->vp) { 1317 oblksize = hammer2_calc_logical(ip, 0, NULL, NULL); 1318 nblksize = hammer2_calc_logical(ip, 0, NULL, NULL); 1319 nvextendbuf(ip->vp, 1320 osize, nsize, 1321 oblksize, nblksize, 1322 -1, -1, 0); 1323 } 1324 hammer2_mtx_ex(&ip->lock); 1325 } 1326 1327 static 1328 int 1329 hammer2_vop_nresolve(struct vop_nresolve_args *ap) 1330 { 1331 hammer2_xop_nresolve_t *xop; 1332 hammer2_inode_t *ip; 1333 hammer2_inode_t *dip; 1334 struct namecache *ncp; 1335 struct vnode *vp; 1336 int error; 1337 1338 dip = VTOI(ap->a_dvp); 1339 xop = hammer2_xop_alloc(dip, 0); 1340 1341 ncp = ap->a_nch->ncp; 1342 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen); 1343 1344 /* 1345 * Note: In DragonFly the kernel handles '.' and '..'. 1346 */ 1347 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1348 hammer2_xop_start(&xop->head, &hammer2_nresolve_desc); 1349 1350 error = hammer2_xop_collect(&xop->head, 0); 1351 error = hammer2_error_to_errno(error); 1352 if (error) { 1353 ip = NULL; 1354 } else { 1355 ip = hammer2_inode_get(dip->pmp, &xop->head, -1, -1); 1356 } 1357 hammer2_inode_unlock(dip); 1358 1359 /* 1360 * Acquire the related vnode 1361 * 1362 * NOTE: For error processing, only ENOENT resolves the namecache 1363 * entry to NULL, otherwise we just return the error and 1364 * leave the namecache unresolved. 1365 * 1366 * WARNING: inode structure is locked exclusively via inode_get 1367 * but chain was locked shared. inode_unlock() 1368 * will handle it properly. 1369 */ 1370 if (ip) { 1371 vp = hammer2_igetv(ip, &error); /* error set to UNIX error */ 1372 if (error == 0) { 1373 vn_unlock(vp); 1374 cache_setvp(ap->a_nch, vp); 1375 } else if (error == ENOENT) { 1376 cache_setvp(ap->a_nch, NULL); 1377 } 1378 hammer2_inode_unlock(ip); 1379 1380 /* 1381 * The vp should not be released until after we've disposed 1382 * of our locks, because it might cause vop_inactive() to 1383 * be called. 1384 */ 1385 if (vp) 1386 vrele(vp); 1387 } else { 1388 error = ENOENT; 1389 cache_setvp(ap->a_nch, NULL); 1390 } 1391 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1392 KASSERT(error || ap->a_nch->ncp->nc_vp != NULL, 1393 ("resolve error %d/%p ap %p\n", 1394 error, ap->a_nch->ncp->nc_vp, ap)); 1395 1396 return error; 1397 } 1398 1399 static 1400 int 1401 hammer2_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap) 1402 { 1403 hammer2_inode_t *dip; 1404 hammer2_tid_t inum; 1405 int error; 1406 1407 dip = VTOI(ap->a_dvp); 1408 inum = dip->meta.iparent; 1409 *ap->a_vpp = NULL; 1410 1411 if (inum) { 1412 error = hammer2_vfs_vget(ap->a_dvp->v_mount, NULL, 1413 inum, ap->a_vpp); 1414 } else { 1415 error = ENOENT; 1416 } 1417 return error; 1418 } 1419 1420 static 1421 int 1422 hammer2_vop_nmkdir(struct vop_nmkdir_args *ap) 1423 { 1424 hammer2_inode_t *dip; 1425 hammer2_inode_t *nip; 1426 struct namecache *ncp; 1427 const char *name; 1428 size_t name_len; 1429 hammer2_tid_t inum; 1430 int error; 1431 1432 dip = VTOI(ap->a_dvp); 1433 if (dip->pmp->ronly || (dip->pmp->flags & HAMMER2_PMPF_EMERG)) 1434 return (EROFS); 1435 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1436 return (ENOSPC); 1437 1438 ncp = ap->a_nch->ncp; 1439 name = ncp->nc_name; 1440 name_len = ncp->nc_nlen; 1441 1442 hammer2_trans_init(dip->pmp, 0); 1443 1444 inum = hammer2_trans_newinum(dip->pmp); 1445 1446 /* 1447 * Create the directory as an inode and then create the directory 1448 * entry. 1449 * 1450 * dip must be locked before nip to avoid deadlock. 1451 */ 1452 hammer2_inode_lock(dip, 0); 1453 nip = hammer2_inode_create_normal(dip, ap->a_vap, ap->a_cred, 1454 inum, &error); 1455 if (error) { 1456 error = hammer2_error_to_errno(error); 1457 } else { 1458 error = hammer2_dirent_create(dip, name, name_len, 1459 nip->meta.inum, nip->meta.type); 1460 /* returns UNIX error code */ 1461 } 1462 if (error) { 1463 if (nip) { 1464 hammer2_inode_unlink_finisher(nip, NULL); 1465 hammer2_inode_unlock(nip); 1466 nip = NULL; 1467 } 1468 *ap->a_vpp = NULL; 1469 } else { 1470 /* 1471 * inode_depend() must occur before the igetv() because 1472 * the igetv() can temporarily release the inode lock. 1473 */ 1474 hammer2_inode_depend(dip, nip); /* before igetv */ 1475 *ap->a_vpp = hammer2_igetv(nip, &error); 1476 hammer2_inode_unlock(nip); 1477 } 1478 1479 /* 1480 * Update dip's mtime 1481 * 1482 * We can use a shared inode lock and allow the meta.mtime update 1483 * SMP race. hammer2_inode_modify() is MPSAFE w/a shared lock. 1484 */ 1485 if (error == 0) { 1486 uint64_t mtime; 1487 1488 /*hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);*/ 1489 hammer2_update_time(&mtime); 1490 hammer2_inode_modify(dip); 1491 dip->meta.mtime = mtime; 1492 /*hammer2_inode_unlock(dip);*/ 1493 } 1494 hammer2_inode_unlock(dip); 1495 1496 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 1497 1498 if (error == 0) { 1499 cache_setunresolved(ap->a_nch); 1500 cache_setvp(ap->a_nch, *ap->a_vpp); 1501 hammer2_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1502 } 1503 return error; 1504 } 1505 1506 static 1507 int 1508 hammer2_vop_open(struct vop_open_args *ap) 1509 { 1510 return vop_stdopen(ap); 1511 } 1512 1513 /* 1514 * hammer2_vop_advlock { vp, id, op, fl, flags } 1515 */ 1516 static 1517 int 1518 hammer2_vop_advlock(struct vop_advlock_args *ap) 1519 { 1520 hammer2_inode_t *ip = VTOI(ap->a_vp); 1521 hammer2_off_t size; 1522 1523 size = ip->meta.size; 1524 return (lf_advlock(ap, &ip->advlock, size)); 1525 } 1526 1527 static 1528 int 1529 hammer2_vop_close(struct vop_close_args *ap) 1530 { 1531 return vop_stdclose(ap); 1532 } 1533 1534 /* 1535 * hammer2_vop_nlink { nch, dvp, vp, cred } 1536 * 1537 * Create a hardlink from (vp) to {dvp, nch}. 1538 */ 1539 static 1540 int 1541 hammer2_vop_nlink(struct vop_nlink_args *ap) 1542 { 1543 hammer2_inode_t *tdip; /* target directory to create link in */ 1544 hammer2_inode_t *ip; /* inode we are hardlinking to */ 1545 struct namecache *ncp; 1546 const char *name; 1547 size_t name_len; 1548 int error; 1549 uint64_t cmtime; 1550 1551 if (ap->a_dvp->v_mount != ap->a_vp->v_mount) 1552 return(EXDEV); 1553 1554 tdip = VTOI(ap->a_dvp); 1555 if (tdip->pmp->ronly || (tdip->pmp->flags & HAMMER2_PMPF_EMERG)) 1556 return (EROFS); 1557 if (hammer2_vfs_enospace(tdip, 0, ap->a_cred) > 1) 1558 return (ENOSPC); 1559 1560 ncp = ap->a_nch->ncp; 1561 name = ncp->nc_name; 1562 name_len = ncp->nc_nlen; 1563 1564 /* 1565 * ip represents the file being hardlinked. The file could be a 1566 * normal file or a hardlink target if it has already been hardlinked. 1567 * (with the new semantics, it will almost always be a hardlink 1568 * target). 1569 * 1570 * Bump nlinks and potentially also create or move the hardlink 1571 * target in the parent directory common to (ip) and (tdip). The 1572 * consolidation code can modify ip->cluster. The returned cluster 1573 * is locked. 1574 */ 1575 ip = VTOI(ap->a_vp); 1576 KASSERT(ip->pmp, ("ip->pmp is NULL %p %p", ip, ip->pmp)); 1577 hammer2_trans_init(ip->pmp, 0); 1578 1579 /* 1580 * Target should be an indexed inode or there's no way we will ever 1581 * be able to find it! 1582 */ 1583 KKASSERT((ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE) == 0); 1584 1585 hammer2_inode_lock4(tdip, ip, NULL, NULL); 1586 1587 hammer2_update_time(&cmtime); 1588 1589 /* 1590 * Create the directory entry and bump nlinks. 1591 * Also update ip's ctime. 1592 */ 1593 error = hammer2_dirent_create(tdip, name, name_len, 1594 ip->meta.inum, ip->meta.type); 1595 hammer2_inode_modify(ip); 1596 ++ip->meta.nlinks; 1597 ip->meta.ctime = cmtime; 1598 if (error == 0) { 1599 /* 1600 * Update dip's [cm]time 1601 */ 1602 hammer2_inode_modify(tdip); 1603 tdip->meta.mtime = cmtime; 1604 tdip->meta.ctime = cmtime; 1605 1606 cache_setunresolved(ap->a_nch); 1607 cache_setvp(ap->a_nch, ap->a_vp); 1608 } 1609 hammer2_inode_unlock(ip); 1610 hammer2_inode_unlock(tdip); 1611 1612 hammer2_trans_done(ip->pmp, HAMMER2_TRANS_SIDEQ); 1613 hammer2_knote(ap->a_vp, NOTE_LINK); 1614 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1615 1616 return error; 1617 } 1618 1619 /* 1620 * hammer2_vop_ncreate { nch, dvp, vpp, cred, vap } 1621 * 1622 * The operating system has already ensured that the directory entry 1623 * does not exist and done all appropriate namespace locking. 1624 */ 1625 static 1626 int 1627 hammer2_vop_ncreate(struct vop_ncreate_args *ap) 1628 { 1629 hammer2_inode_t *dip; 1630 hammer2_inode_t *nip; 1631 struct namecache *ncp; 1632 const char *name; 1633 size_t name_len; 1634 hammer2_tid_t inum; 1635 int error; 1636 1637 dip = VTOI(ap->a_dvp); 1638 if (dip->pmp->ronly || (dip->pmp->flags & HAMMER2_PMPF_EMERG)) 1639 return (EROFS); 1640 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1641 return (ENOSPC); 1642 1643 ncp = ap->a_nch->ncp; 1644 name = ncp->nc_name; 1645 name_len = ncp->nc_nlen; 1646 hammer2_trans_init(dip->pmp, 0); 1647 1648 inum = hammer2_trans_newinum(dip->pmp); 1649 1650 /* 1651 * Create the regular file as an inode and then create the directory 1652 * entry. 1653 * 1654 * dip must be locked before nip to avoid deadlock. 1655 */ 1656 hammer2_inode_lock(dip, 0); 1657 nip = hammer2_inode_create_normal(dip, ap->a_vap, ap->a_cred, 1658 inum, &error); 1659 if (error) { 1660 error = hammer2_error_to_errno(error); 1661 } else { 1662 error = hammer2_dirent_create(dip, name, name_len, 1663 nip->meta.inum, nip->meta.type); 1664 } 1665 if (error) { 1666 if (nip) { 1667 hammer2_inode_unlink_finisher(nip, NULL); 1668 hammer2_inode_unlock(nip); 1669 nip = NULL; 1670 } 1671 *ap->a_vpp = NULL; 1672 } else { 1673 hammer2_inode_depend(dip, nip); /* before igetv */ 1674 *ap->a_vpp = hammer2_igetv(nip, &error); 1675 hammer2_inode_unlock(nip); 1676 } 1677 1678 /* 1679 * Update dip's mtime 1680 */ 1681 if (error == 0) { 1682 uint64_t mtime; 1683 1684 /*hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);*/ 1685 hammer2_update_time(&mtime); 1686 hammer2_inode_modify(dip); 1687 dip->meta.mtime = mtime; 1688 /*hammer2_inode_unlock(dip);*/ 1689 } 1690 hammer2_inode_unlock(dip); 1691 1692 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 1693 1694 if (error == 0) { 1695 cache_setunresolved(ap->a_nch); 1696 cache_setvp(ap->a_nch, *ap->a_vpp); 1697 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1698 } 1699 return error; 1700 } 1701 1702 /* 1703 * Make a device node (typically a fifo) 1704 */ 1705 static 1706 int 1707 hammer2_vop_nmknod(struct vop_nmknod_args *ap) 1708 { 1709 hammer2_inode_t *dip; 1710 hammer2_inode_t *nip; 1711 struct namecache *ncp; 1712 const char *name; 1713 size_t name_len; 1714 hammer2_tid_t inum; 1715 int error; 1716 1717 dip = VTOI(ap->a_dvp); 1718 if (dip->pmp->ronly || (dip->pmp->flags & HAMMER2_PMPF_EMERG)) 1719 return (EROFS); 1720 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1721 return (ENOSPC); 1722 1723 ncp = ap->a_nch->ncp; 1724 name = ncp->nc_name; 1725 name_len = ncp->nc_nlen; 1726 hammer2_trans_init(dip->pmp, 0); 1727 1728 /* 1729 * Create the device inode and then create the directory entry. 1730 * 1731 * dip must be locked before nip to avoid deadlock. 1732 */ 1733 inum = hammer2_trans_newinum(dip->pmp); 1734 1735 hammer2_inode_lock(dip, 0); 1736 nip = hammer2_inode_create_normal(dip, ap->a_vap, ap->a_cred, 1737 inum, &error); 1738 if (error) { 1739 error = hammer2_error_to_errno(error); 1740 } else { 1741 error = hammer2_dirent_create(dip, name, name_len, 1742 nip->meta.inum, nip->meta.type); 1743 } 1744 if (error) { 1745 if (nip) { 1746 hammer2_inode_unlink_finisher(nip, NULL); 1747 hammer2_inode_unlock(nip); 1748 nip = NULL; 1749 } 1750 *ap->a_vpp = NULL; 1751 } else { 1752 hammer2_inode_depend(dip, nip); /* before igetv */ 1753 *ap->a_vpp = hammer2_igetv(nip, &error); 1754 hammer2_inode_unlock(nip); 1755 } 1756 1757 /* 1758 * Update dip's mtime 1759 */ 1760 if (error == 0) { 1761 uint64_t mtime; 1762 1763 /*hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);*/ 1764 hammer2_update_time(&mtime); 1765 hammer2_inode_modify(dip); 1766 dip->meta.mtime = mtime; 1767 /*hammer2_inode_unlock(dip);*/ 1768 } 1769 hammer2_inode_unlock(dip); 1770 1771 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 1772 1773 if (error == 0) { 1774 cache_setunresolved(ap->a_nch); 1775 cache_setvp(ap->a_nch, *ap->a_vpp); 1776 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1777 } 1778 return error; 1779 } 1780 1781 /* 1782 * hammer2_vop_nsymlink { nch, dvp, vpp, cred, vap, target } 1783 */ 1784 static 1785 int 1786 hammer2_vop_nsymlink(struct vop_nsymlink_args *ap) 1787 { 1788 hammer2_inode_t *dip; 1789 hammer2_inode_t *nip; 1790 struct namecache *ncp; 1791 const char *name; 1792 size_t name_len; 1793 hammer2_tid_t inum; 1794 int error; 1795 1796 dip = VTOI(ap->a_dvp); 1797 if (dip->pmp->ronly || (dip->pmp->flags & HAMMER2_PMPF_EMERG)) 1798 return (EROFS); 1799 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1800 return (ENOSPC); 1801 1802 ncp = ap->a_nch->ncp; 1803 name = ncp->nc_name; 1804 name_len = ncp->nc_nlen; 1805 hammer2_trans_init(dip->pmp, 0); 1806 1807 ap->a_vap->va_type = VLNK; /* enforce type */ 1808 1809 /* 1810 * Create the softlink as an inode and then create the directory 1811 * entry. 1812 * 1813 * dip must be locked before nip to avoid deadlock. 1814 */ 1815 inum = hammer2_trans_newinum(dip->pmp); 1816 1817 hammer2_inode_lock(dip, 0); 1818 nip = hammer2_inode_create_normal(dip, ap->a_vap, ap->a_cred, 1819 inum, &error); 1820 if (error) { 1821 error = hammer2_error_to_errno(error); 1822 } else { 1823 error = hammer2_dirent_create(dip, name, name_len, 1824 nip->meta.inum, nip->meta.type); 1825 } 1826 if (error) { 1827 if (nip) { 1828 hammer2_inode_unlink_finisher(nip, NULL); 1829 hammer2_inode_unlock(nip); 1830 nip = NULL; 1831 } 1832 *ap->a_vpp = NULL; 1833 hammer2_inode_unlock(dip); 1834 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 1835 return error; 1836 } 1837 hammer2_inode_depend(dip, nip); /* before igetv */ 1838 *ap->a_vpp = hammer2_igetv(nip, &error); 1839 1840 /* 1841 * Build the softlink (~like file data) and finalize the namecache. 1842 */ 1843 if (error == 0) { 1844 size_t bytes; 1845 struct uio auio; 1846 struct iovec aiov; 1847 1848 bytes = strlen(ap->a_target); 1849 1850 hammer2_inode_unlock(nip); 1851 bzero(&auio, sizeof(auio)); 1852 bzero(&aiov, sizeof(aiov)); 1853 auio.uio_iov = &aiov; 1854 auio.uio_segflg = UIO_SYSSPACE; 1855 auio.uio_rw = UIO_WRITE; 1856 auio.uio_resid = bytes; 1857 auio.uio_iovcnt = 1; 1858 auio.uio_td = curthread; 1859 aiov.iov_base = ap->a_target; 1860 aiov.iov_len = bytes; 1861 error = hammer2_write_file(nip, &auio, IO_APPEND, 0); 1862 /* XXX handle error */ 1863 error = 0; 1864 } else { 1865 hammer2_inode_unlock(nip); 1866 } 1867 1868 /* 1869 * Update dip's mtime 1870 */ 1871 if (error == 0) { 1872 uint64_t mtime; 1873 1874 /*hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);*/ 1875 hammer2_update_time(&mtime); 1876 hammer2_inode_modify(dip); 1877 dip->meta.mtime = mtime; 1878 /*hammer2_inode_unlock(dip);*/ 1879 } 1880 hammer2_inode_unlock(dip); 1881 1882 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 1883 1884 /* 1885 * Finalize namecache 1886 */ 1887 if (error == 0) { 1888 cache_setunresolved(ap->a_nch); 1889 cache_setvp(ap->a_nch, *ap->a_vpp); 1890 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1891 } 1892 return error; 1893 } 1894 1895 /* 1896 * hammer2_vop_nremove { nch, dvp, cred } 1897 */ 1898 static 1899 int 1900 hammer2_vop_nremove(struct vop_nremove_args *ap) 1901 { 1902 hammer2_xop_unlink_t *xop; 1903 hammer2_inode_t *dip; 1904 hammer2_inode_t *ip; 1905 struct vnode *vprecycle; 1906 struct namecache *ncp; 1907 int error; 1908 1909 dip = VTOI(ap->a_dvp); 1910 if (dip->pmp->ronly) 1911 return (EROFS); 1912 #if 0 1913 /* allow removals, except user to also bulkfree */ 1914 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1915 return (ENOSPC); 1916 #endif 1917 1918 ncp = ap->a_nch->ncp; 1919 1920 if (hammer2_debug_inode && dip->meta.inum == hammer2_debug_inode) { 1921 kprintf("hammer2: attempt to delete inside debug inode: %s\n", 1922 ncp->nc_name); 1923 while (hammer2_debug_inode && 1924 dip->meta.inum == hammer2_debug_inode) { 1925 tsleep(&hammer2_debug_inode, 0, "h2debug", hz*5); 1926 } 1927 } 1928 1929 hammer2_trans_init(dip->pmp, 0); 1930 hammer2_inode_lock(dip, 0); 1931 1932 /* 1933 * The unlink XOP unlinks the path from the directory and 1934 * locates and returns the cluster associated with the real inode. 1935 * We have to handle nlinks here on the frontend. 1936 */ 1937 xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING); 1938 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen); 1939 1940 xop->isdir = 0; 1941 xop->dopermanent = 0; 1942 hammer2_xop_start(&xop->head, &hammer2_unlink_desc); 1943 1944 /* 1945 * Collect the real inode and adjust nlinks, destroy the real 1946 * inode if nlinks transitions to 0 and it was the real inode 1947 * (else it has already been removed). 1948 */ 1949 error = hammer2_xop_collect(&xop->head, 0); 1950 error = hammer2_error_to_errno(error); 1951 vprecycle = NULL; 1952 1953 if (error == 0) { 1954 ip = hammer2_inode_get(dip->pmp, &xop->head, -1, -1); 1955 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1956 if (ip) { 1957 if (hammer2_debug_inode && 1958 ip->meta.inum == hammer2_debug_inode) { 1959 kprintf("hammer2: attempt to delete debug " 1960 "inode!\n"); 1961 while (hammer2_debug_inode && 1962 ip->meta.inum == hammer2_debug_inode) { 1963 tsleep(&hammer2_debug_inode, 0, 1964 "h2debug", hz*5); 1965 } 1966 } 1967 hammer2_inode_unlink_finisher(ip, &vprecycle); 1968 hammer2_inode_depend(dip, ip); /* after modified */ 1969 hammer2_inode_unlock(ip); 1970 } 1971 } else { 1972 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1973 } 1974 1975 /* 1976 * Update dip's mtime 1977 */ 1978 if (error == 0) { 1979 uint64_t mtime; 1980 1981 /*hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);*/ 1982 hammer2_update_time(&mtime); 1983 hammer2_inode_modify(dip); 1984 dip->meta.mtime = mtime; 1985 /*hammer2_inode_unlock(dip);*/ 1986 } 1987 hammer2_inode_unlock(dip); 1988 1989 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 1990 if (error == 0) { 1991 cache_unlink(ap->a_nch); 1992 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1993 } 1994 if (vprecycle) 1995 hammer2_inode_vprecycle(vprecycle); 1996 1997 return (error); 1998 } 1999 2000 /* 2001 * hammer2_vop_nrmdir { nch, dvp, cred } 2002 */ 2003 static 2004 int 2005 hammer2_vop_nrmdir(struct vop_nrmdir_args *ap) 2006 { 2007 hammer2_xop_unlink_t *xop; 2008 hammer2_inode_t *dip; 2009 hammer2_inode_t *ip; 2010 struct namecache *ncp; 2011 struct vnode *vprecycle; 2012 int error; 2013 2014 dip = VTOI(ap->a_dvp); 2015 if (dip->pmp->ronly) 2016 return (EROFS); 2017 #if 0 2018 /* allow removals, except user to also bulkfree */ 2019 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 2020 return (ENOSPC); 2021 #endif 2022 2023 hammer2_trans_init(dip->pmp, 0); 2024 hammer2_inode_lock(dip, 0); 2025 2026 xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING); 2027 2028 ncp = ap->a_nch->ncp; 2029 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen); 2030 xop->isdir = 1; 2031 xop->dopermanent = 0; 2032 hammer2_xop_start(&xop->head, &hammer2_unlink_desc); 2033 2034 /* 2035 * Collect the real inode and adjust nlinks, destroy the real 2036 * inode if nlinks transitions to 0 and it was the real inode 2037 * (else it has already been removed). 2038 */ 2039 error = hammer2_xop_collect(&xop->head, 0); 2040 error = hammer2_error_to_errno(error); 2041 vprecycle = NULL; 2042 2043 if (error == 0) { 2044 ip = hammer2_inode_get(dip->pmp, &xop->head, -1, -1); 2045 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 2046 if (ip) { 2047 hammer2_inode_unlink_finisher(ip, &vprecycle); 2048 hammer2_inode_depend(dip, ip); /* after modified */ 2049 hammer2_inode_unlock(ip); 2050 } 2051 } else { 2052 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 2053 } 2054 2055 /* 2056 * Update dip's mtime 2057 */ 2058 if (error == 0) { 2059 uint64_t mtime; 2060 2061 /*hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);*/ 2062 hammer2_update_time(&mtime); 2063 hammer2_inode_modify(dip); 2064 dip->meta.mtime = mtime; 2065 /*hammer2_inode_unlock(dip);*/ 2066 } 2067 hammer2_inode_unlock(dip); 2068 2069 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 2070 if (error == 0) { 2071 cache_unlink(ap->a_nch); 2072 hammer2_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 2073 } 2074 if (vprecycle) 2075 hammer2_inode_vprecycle(vprecycle); 2076 return (error); 2077 } 2078 2079 /* 2080 * hammer2_vop_nrename { fnch, tnch, fdvp, tdvp, cred } 2081 */ 2082 static 2083 int 2084 hammer2_vop_nrename(struct vop_nrename_args *ap) 2085 { 2086 struct namecache *fncp; 2087 struct namecache *tncp; 2088 hammer2_inode_t *fdip; /* source directory */ 2089 hammer2_inode_t *tdip; /* target directory */ 2090 hammer2_inode_t *ip; /* file being renamed */ 2091 hammer2_inode_t *tip; /* replaced target during rename or NULL */ 2092 struct vnode *vprecycle; 2093 const char *fname; 2094 size_t fname_len; 2095 const char *tname; 2096 size_t tname_len; 2097 int error; 2098 int update_tdip; 2099 int update_fdip; 2100 hammer2_key_t tlhc; 2101 2102 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount) 2103 return(EXDEV); 2104 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount) 2105 return(EXDEV); 2106 2107 fdip = VTOI(ap->a_fdvp); /* source directory */ 2108 tdip = VTOI(ap->a_tdvp); /* target directory */ 2109 2110 if (fdip->pmp->ronly || (fdip->pmp->flags & HAMMER2_PMPF_EMERG)) 2111 return (EROFS); 2112 if (hammer2_vfs_enospace(fdip, 0, ap->a_cred) > 1) 2113 return (ENOSPC); 2114 2115 fncp = ap->a_fnch->ncp; /* entry name in source */ 2116 fname = fncp->nc_name; 2117 fname_len = fncp->nc_nlen; 2118 2119 tncp = ap->a_tnch->ncp; /* entry name in target */ 2120 tname = tncp->nc_name; 2121 tname_len = tncp->nc_nlen; 2122 2123 hammer2_trans_init(tdip->pmp, 0); 2124 2125 update_tdip = 0; 2126 update_fdip = 0; 2127 2128 ip = VTOI(fncp->nc_vp); 2129 hammer2_inode_ref(ip); /* extra ref */ 2130 2131 /* 2132 * Lookup the target name to determine if a directory entry 2133 * is being overwritten. We only hold related inode locks 2134 * temporarily, the operating system is expected to protect 2135 * against rename races. 2136 */ 2137 tip = tncp->nc_vp ? VTOI(tncp->nc_vp) : NULL; 2138 if (tip) 2139 hammer2_inode_ref(tip); /* extra ref */ 2140 2141 /* 2142 * For now try to avoid deadlocks with a simple pointer address 2143 * test. (tip) can be NULL. 2144 */ 2145 error = 0; 2146 { 2147 hammer2_inode_t *ip1 = fdip; 2148 hammer2_inode_t *ip2 = tdip; 2149 hammer2_inode_t *ip3 = ip; 2150 hammer2_inode_t *ip4 = tip; /* may be NULL */ 2151 2152 if (fdip > tdip) { 2153 ip1 = tdip; 2154 ip2 = fdip; 2155 } 2156 if (tip && ip > tip) { 2157 ip3 = tip; 2158 ip4 = ip; 2159 } 2160 hammer2_inode_lock4(ip1, ip2, ip3, ip4); 2161 } 2162 2163 /* 2164 * Resolve the collision space for (tdip, tname, tname_len) 2165 * 2166 * tdip must be held exclusively locked to prevent races since 2167 * multiple filenames can end up in the same collision space. 2168 */ 2169 { 2170 hammer2_xop_scanlhc_t *sxop; 2171 hammer2_tid_t lhcbase; 2172 2173 tlhc = hammer2_dirhash(tname, tname_len); 2174 lhcbase = tlhc; 2175 sxop = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING); 2176 sxop->lhc = tlhc; 2177 hammer2_xop_start(&sxop->head, &hammer2_scanlhc_desc); 2178 while ((error = hammer2_xop_collect(&sxop->head, 0)) == 0) { 2179 if (tlhc != sxop->head.cluster.focus->bref.key) 2180 break; 2181 ++tlhc; 2182 } 2183 error = hammer2_error_to_errno(error); 2184 hammer2_xop_retire(&sxop->head, HAMMER2_XOPMASK_VOP); 2185 2186 if (error) { 2187 if (error != ENOENT) 2188 goto done2; 2189 ++tlhc; 2190 error = 0; 2191 } 2192 if ((lhcbase ^ tlhc) & ~HAMMER2_DIRHASH_LOMASK) { 2193 error = ENOSPC; 2194 goto done2; 2195 } 2196 } 2197 2198 /* 2199 * Ready to go, issue the rename to the backend. Note that meta-data 2200 * updates to the related inodes occur separately from the rename 2201 * operation. 2202 * 2203 * NOTE: While it is not necessary to update ip->meta.name*, doing 2204 * so aids catastrophic recovery and debugging. 2205 */ 2206 if (error == 0) { 2207 hammer2_xop_nrename_t *xop4; 2208 2209 xop4 = hammer2_xop_alloc(fdip, HAMMER2_XOP_MODIFYING); 2210 xop4->lhc = tlhc; 2211 xop4->ip_key = ip->meta.name_key; 2212 hammer2_xop_setip2(&xop4->head, ip); 2213 hammer2_xop_setip3(&xop4->head, tdip); 2214 if (tip && tip->meta.type == HAMMER2_OBJTYPE_DIRECTORY) 2215 hammer2_xop_setip4(&xop4->head, tip); 2216 hammer2_xop_setname(&xop4->head, fname, fname_len); 2217 hammer2_xop_setname2(&xop4->head, tname, tname_len); 2218 hammer2_xop_start(&xop4->head, &hammer2_nrename_desc); 2219 2220 error = hammer2_xop_collect(&xop4->head, 0); 2221 error = hammer2_error_to_errno(error); 2222 hammer2_xop_retire(&xop4->head, HAMMER2_XOPMASK_VOP); 2223 2224 if (error == ENOENT) 2225 error = 0; 2226 2227 /* 2228 * Update inode meta-data. 2229 * 2230 * WARNING! The in-memory inode (ip) structure does not 2231 * maintain a copy of the inode's filename buffer. 2232 */ 2233 if (error == 0 && 2234 (ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE)) { 2235 hammer2_inode_modify(ip); 2236 ip->meta.name_len = tname_len; 2237 ip->meta.name_key = tlhc; 2238 } 2239 if (error == 0) { 2240 hammer2_inode_modify(ip); 2241 ip->meta.iparent = tdip->meta.inum; 2242 } 2243 update_fdip = 1; 2244 update_tdip = 1; 2245 } 2246 2247 done2: 2248 /* 2249 * If no error, the backend has replaced the target directory entry. 2250 * We must adjust nlinks on the original replace target if it exists. 2251 */ 2252 vprecycle = NULL; 2253 if (error == 0 && tip) { 2254 hammer2_inode_unlink_finisher(tip, &vprecycle); 2255 } 2256 2257 /* 2258 * Update directory mtimes to represent the something changed. 2259 */ 2260 if (update_fdip || update_tdip) { 2261 uint64_t mtime; 2262 2263 hammer2_update_time(&mtime); 2264 if (update_fdip) { 2265 hammer2_inode_modify(fdip); 2266 fdip->meta.mtime = mtime; 2267 } 2268 if (update_tdip) { 2269 hammer2_inode_modify(tdip); 2270 tdip->meta.mtime = mtime; 2271 } 2272 } 2273 if (tip) { 2274 hammer2_inode_unlock(tip); 2275 hammer2_inode_drop(tip); 2276 } 2277 hammer2_inode_unlock(ip); 2278 hammer2_inode_unlock(tdip); 2279 hammer2_inode_unlock(fdip); 2280 hammer2_inode_drop(ip); 2281 hammer2_trans_done(tdip->pmp, HAMMER2_TRANS_SIDEQ); 2282 2283 /* 2284 * Issue the namecache update after unlocking all the internal 2285 * hammer2 structures, otherwise we might deadlock. 2286 * 2287 * WARNING! The target namespace must be updated atomically, 2288 * and we depend on cache_rename() to handle that for 2289 * us. Do not do a separate cache_unlink() because 2290 * that leaves a small window of opportunity for other 2291 * threads to allocate the target namespace before we 2292 * manage to complete our rename. 2293 * 2294 * WARNING! cache_rename() (and cache_unlink()) will properly 2295 * set VREF_FINALIZE on any attached vnode. Do not 2296 * call cache_setunresolved() manually before-hand as 2297 * this will prevent the flag from being set later via 2298 * cache_rename(). If VREF_FINALIZE is not properly set 2299 * and the inode is no longer in the topology, related 2300 * chains can remain dirty indefinitely. 2301 */ 2302 if (error == 0 && tip) { 2303 /*cache_unlink(ap->a_tnch); see above */ 2304 /*cache_setunresolved(ap->a_tnch); see above */ 2305 } 2306 if (error == 0) { 2307 cache_rename(ap->a_fnch, ap->a_tnch); 2308 hammer2_knote(ap->a_fdvp, NOTE_WRITE); 2309 hammer2_knote(ap->a_tdvp, NOTE_WRITE); 2310 hammer2_knote(fncp->nc_vp, NOTE_RENAME); 2311 } 2312 if (vprecycle) 2313 hammer2_inode_vprecycle(vprecycle); 2314 2315 return (error); 2316 } 2317 2318 /* 2319 * hammer2_vop_ioctl { vp, command, data, fflag, cred } 2320 */ 2321 static 2322 int 2323 hammer2_vop_ioctl(struct vop_ioctl_args *ap) 2324 { 2325 hammer2_inode_t *ip; 2326 int error; 2327 2328 ip = VTOI(ap->a_vp); 2329 2330 error = hammer2_ioctl(ip, ap->a_command, (void *)ap->a_data, 2331 ap->a_fflag, ap->a_cred); 2332 return (error); 2333 } 2334 2335 static 2336 int 2337 hammer2_vop_mountctl(struct vop_mountctl_args *ap) 2338 { 2339 struct mount *mp; 2340 hammer2_pfs_t *pmp; 2341 int rc; 2342 2343 switch (ap->a_op) { 2344 case (MOUNTCTL_SET_EXPORT): 2345 mp = ap->a_head.a_ops->head.vv_mount; 2346 pmp = MPTOPMP(mp); 2347 2348 if (ap->a_ctllen != sizeof(struct export_args)) 2349 rc = (EINVAL); 2350 else 2351 rc = vfs_export(mp, &pmp->export, 2352 (const struct export_args *)ap->a_ctl); 2353 break; 2354 default: 2355 rc = vop_stdmountctl(ap); 2356 break; 2357 } 2358 return (rc); 2359 } 2360 2361 /* 2362 * KQFILTER 2363 */ 2364 static void filt_hammer2detach(struct knote *kn); 2365 static int filt_hammer2read(struct knote *kn, long hint); 2366 static int filt_hammer2write(struct knote *kn, long hint); 2367 static int filt_hammer2vnode(struct knote *kn, long hint); 2368 2369 static struct filterops hammer2read_filtops = 2370 { FILTEROP_ISFD | FILTEROP_MPSAFE, 2371 NULL, filt_hammer2detach, filt_hammer2read }; 2372 static struct filterops hammer2write_filtops = 2373 { FILTEROP_ISFD | FILTEROP_MPSAFE, 2374 NULL, filt_hammer2detach, filt_hammer2write }; 2375 static struct filterops hammer2vnode_filtops = 2376 { FILTEROP_ISFD | FILTEROP_MPSAFE, 2377 NULL, filt_hammer2detach, filt_hammer2vnode }; 2378 2379 static 2380 int 2381 hammer2_vop_kqfilter(struct vop_kqfilter_args *ap) 2382 { 2383 struct vnode *vp = ap->a_vp; 2384 struct knote *kn = ap->a_kn; 2385 2386 switch (kn->kn_filter) { 2387 case EVFILT_READ: 2388 kn->kn_fop = &hammer2read_filtops; 2389 break; 2390 case EVFILT_WRITE: 2391 kn->kn_fop = &hammer2write_filtops; 2392 break; 2393 case EVFILT_VNODE: 2394 kn->kn_fop = &hammer2vnode_filtops; 2395 break; 2396 default: 2397 return (EOPNOTSUPP); 2398 } 2399 2400 kn->kn_hook = (caddr_t)vp; 2401 2402 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 2403 2404 return(0); 2405 } 2406 2407 static void 2408 filt_hammer2detach(struct knote *kn) 2409 { 2410 struct vnode *vp = (void *)kn->kn_hook; 2411 2412 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 2413 } 2414 2415 static int 2416 filt_hammer2read(struct knote *kn, long hint) 2417 { 2418 struct vnode *vp = (void *)kn->kn_hook; 2419 hammer2_inode_t *ip = VTOI(vp); 2420 off_t off; 2421 2422 if (hint == NOTE_REVOKE) { 2423 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 2424 return(1); 2425 } 2426 off = ip->meta.size - kn->kn_fp->f_offset; 2427 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 2428 if (kn->kn_sfflags & NOTE_OLDAPI) 2429 return(1); 2430 return (kn->kn_data != 0); 2431 } 2432 2433 2434 static int 2435 filt_hammer2write(struct knote *kn, long hint) 2436 { 2437 if (hint == NOTE_REVOKE) 2438 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 2439 kn->kn_data = 0; 2440 return (1); 2441 } 2442 2443 static int 2444 filt_hammer2vnode(struct knote *kn, long hint) 2445 { 2446 if (kn->kn_sfflags & hint) 2447 kn->kn_fflags |= hint; 2448 if (hint == NOTE_REVOKE) { 2449 kn->kn_flags |= (EV_EOF | EV_NODATA); 2450 return (1); 2451 } 2452 return (kn->kn_fflags != 0); 2453 } 2454 2455 /* 2456 * FIFO VOPS 2457 */ 2458 static 2459 int 2460 hammer2_vop_markatime(struct vop_markatime_args *ap) 2461 { 2462 hammer2_inode_t *ip; 2463 struct vnode *vp; 2464 2465 vp = ap->a_vp; 2466 ip = VTOI(vp); 2467 2468 if (ip->pmp->ronly || (ip->pmp->flags & HAMMER2_PMPF_EMERG)) 2469 return (EROFS); 2470 return(0); 2471 } 2472 2473 static 2474 int 2475 hammer2_vop_fifokqfilter(struct vop_kqfilter_args *ap) 2476 { 2477 int error; 2478 2479 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 2480 if (error) 2481 error = hammer2_vop_kqfilter(ap); 2482 return(error); 2483 } 2484 2485 /* 2486 * VOPS vector 2487 */ 2488 struct vop_ops hammer2_vnode_vops = { 2489 .vop_default = vop_defaultop, 2490 .vop_fsync = hammer2_vop_fsync, 2491 .vop_getpages = vop_stdgetpages, 2492 .vop_putpages = vop_stdputpages, 2493 .vop_access = hammer2_vop_access, 2494 .vop_advlock = hammer2_vop_advlock, 2495 .vop_close = hammer2_vop_close, 2496 .vop_nlink = hammer2_vop_nlink, 2497 .vop_ncreate = hammer2_vop_ncreate, 2498 .vop_nsymlink = hammer2_vop_nsymlink, 2499 .vop_nremove = hammer2_vop_nremove, 2500 .vop_nrmdir = hammer2_vop_nrmdir, 2501 .vop_nrename = hammer2_vop_nrename, 2502 .vop_getattr = hammer2_vop_getattr, 2503 .vop_getattr_lite = hammer2_vop_getattr_lite, 2504 .vop_setattr = hammer2_vop_setattr, 2505 .vop_readdir = hammer2_vop_readdir, 2506 .vop_readlink = hammer2_vop_readlink, 2507 .vop_read = hammer2_vop_read, 2508 .vop_write = hammer2_vop_write, 2509 .vop_open = hammer2_vop_open, 2510 .vop_inactive = hammer2_vop_inactive, 2511 .vop_reclaim = hammer2_vop_reclaim, 2512 .vop_nresolve = hammer2_vop_nresolve, 2513 .vop_nlookupdotdot = hammer2_vop_nlookupdotdot, 2514 .vop_nmkdir = hammer2_vop_nmkdir, 2515 .vop_nmknod = hammer2_vop_nmknod, 2516 .vop_ioctl = hammer2_vop_ioctl, 2517 .vop_mountctl = hammer2_vop_mountctl, 2518 .vop_bmap = hammer2_vop_bmap, 2519 .vop_strategy = hammer2_vop_strategy, 2520 .vop_kqfilter = hammer2_vop_kqfilter 2521 }; 2522 2523 struct vop_ops hammer2_spec_vops = { 2524 .vop_default = vop_defaultop, 2525 .vop_fsync = hammer2_vop_fsync, 2526 .vop_read = vop_stdnoread, 2527 .vop_write = vop_stdnowrite, 2528 .vop_access = hammer2_vop_access, 2529 .vop_close = hammer2_vop_close, 2530 .vop_markatime = hammer2_vop_markatime, 2531 .vop_getattr = hammer2_vop_getattr, 2532 .vop_inactive = hammer2_vop_inactive, 2533 .vop_reclaim = hammer2_vop_reclaim, 2534 .vop_setattr = hammer2_vop_setattr 2535 }; 2536 2537 struct vop_ops hammer2_fifo_vops = { 2538 .vop_default = fifo_vnoperate, 2539 .vop_fsync = hammer2_vop_fsync, 2540 #if 0 2541 .vop_read = hammer2_vop_fiforead, 2542 .vop_write = hammer2_vop_fifowrite, 2543 #endif 2544 .vop_access = hammer2_vop_access, 2545 #if 0 2546 .vop_close = hammer2_vop_fifoclose, 2547 #endif 2548 .vop_markatime = hammer2_vop_markatime, 2549 .vop_getattr = hammer2_vop_getattr, 2550 .vop_inactive = hammer2_vop_inactive, 2551 .vop_reclaim = hammer2_vop_reclaim, 2552 .vop_setattr = hammer2_vop_setattr, 2553 .vop_kqfilter = hammer2_vop_fifokqfilter 2554 }; 2555 2556