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 hammer2_key_t lbase; 97 int nblksize; 98 99 /* 100 * If the inode has been unlinked we can throw away all 101 * buffers (dirty or not) and clean the file out. 102 * 103 * Because vrecycle() calls are not guaranteed, try to 104 * dispose of the inode as much as possible right here. 105 */ 106 nblksize = hammer2_calc_logical(ip, 0, &lbase, NULL); 107 nvtruncbuf(vp, 0, nblksize, 0, 0); 108 109 /* 110 * Delete the file on-media. 111 */ 112 if ((ip->flags & HAMMER2_INODE_DELETING) == 0) { 113 atomic_set_int(&ip->flags, HAMMER2_INODE_DELETING); 114 hammer2_inode_delayed_sideq(ip); 115 } 116 hammer2_inode_unlock(ip); 117 118 /* 119 * Recycle immediately if possible 120 */ 121 vrecycle(vp); 122 } else { 123 hammer2_inode_unlock(ip); 124 } 125 return (0); 126 } 127 128 /* 129 * Reclaim a vnode so that it can be reused; after the inode is 130 * disassociated, the filesystem must manage it alone. 131 */ 132 static 133 int 134 hammer2_vop_reclaim(struct vop_reclaim_args *ap) 135 { 136 hammer2_inode_t *ip; 137 struct vnode *vp; 138 139 vp = ap->a_vp; 140 ip = VTOI(vp); 141 if (ip == NULL) 142 return(0); 143 144 /* 145 * NOTE! We do not attempt to flush chains here, flushing is 146 * really fragile and could also deadlock. 147 */ 148 vclrisdirty(vp); 149 150 /* 151 * The inode lock is required to disconnect it. 152 */ 153 hammer2_inode_lock(ip, 0); 154 vp->v_data = NULL; 155 ip->vp = NULL; 156 157 /* 158 * Delete the file on-media. This should have been handled by the 159 * inactivation. The operation is likely still queued on the inode 160 * though so only complain if the stars don't align. 161 */ 162 if ((ip->flags & (HAMMER2_INODE_ISUNLINKED | HAMMER2_INODE_DELETING)) == 163 HAMMER2_INODE_ISUNLINKED) 164 { 165 atomic_set_int(&ip->flags, HAMMER2_INODE_DELETING); 166 hammer2_inode_delayed_sideq(ip); 167 kprintf("hammer2: vp=%p ip=%p unlinked but not disposed\n", 168 vp, ip); 169 } 170 hammer2_inode_unlock(ip); 171 172 /* 173 * Modified inodes will already be on SIDEQ or SYNCQ, no further 174 * action is needed. 175 * 176 * We cannot safely synchronize the inode from inside the reclaim 177 * due to potentially deep locks held as-of when the reclaim occurs. 178 * Interactions and potential deadlocks abound. We also can't do it 179 * here without desynchronizing from the related directory entrie(s). 180 */ 181 hammer2_inode_drop(ip); /* vp ref */ 182 183 /* 184 * XXX handle background sync when ip dirty, kernel will no longer 185 * notify us regarding this inode because there is no longer a 186 * vnode attached to it. 187 */ 188 189 return (0); 190 } 191 192 /* 193 * Currently this function synchronizes the front-end inode state to the 194 * backend chain topology, then flushes the inode's chain and sub-topology 195 * to backend media. This function does not flush the root topology down to 196 * the inode. 197 */ 198 static 199 int 200 hammer2_vop_fsync(struct vop_fsync_args *ap) 201 { 202 hammer2_inode_t *ip; 203 struct vnode *vp; 204 int error1; 205 int error2; 206 207 vp = ap->a_vp; 208 ip = VTOI(vp); 209 error1 = 0; 210 211 hammer2_trans_init(ip->pmp, 0); 212 213 /* 214 * Flush dirty buffers in the file's logical buffer cache. 215 * It is best to wait for the strategy code to commit the 216 * buffers to the device's backing buffer cache before 217 * then trying to flush the inode. 218 * 219 * This should be quick, but certain inode modifications cached 220 * entirely in the hammer2_inode structure may not trigger a 221 * buffer read until the flush so the fsync can wind up also 222 * doing scattered reads. 223 */ 224 vfsync(vp, ap->a_waitfor, 1, NULL, NULL); 225 bio_track_wait(&vp->v_track_write, 0, 0); 226 227 /* 228 * Flush any inode changes 229 */ 230 hammer2_inode_lock(ip, 0); 231 if (ip->flags & (HAMMER2_INODE_RESIZED|HAMMER2_INODE_MODIFIED)) 232 error1 = hammer2_inode_chain_sync(ip); 233 234 /* 235 * Flush dirty chains related to the inode. 236 * 237 * NOTE! We are not in a flush transaction. The inode remains on 238 * the sideq so the filesystem syncer can synchronize it to 239 * the volume root. 240 */ 241 error2 = hammer2_inode_chain_flush(ip, HAMMER2_XOP_INODE_STOP); 242 if (error2) 243 error1 = error2; 244 245 /* 246 * We may be able to clear the vnode dirty flag. 247 */ 248 if ((ip->flags & (HAMMER2_INODE_MODIFIED | 249 HAMMER2_INODE_RESIZED | 250 HAMMER2_INODE_DIRTYDATA)) == 0 && 251 RB_EMPTY(&vp->v_rbdirty_tree) && 252 !bio_track_active(&vp->v_track_write)) { 253 vclrisdirty(vp); 254 } 255 hammer2_inode_unlock(ip); 256 hammer2_trans_done(ip->pmp, 0); 257 258 return (error1); 259 } 260 261 /* 262 * No lock needed, just handle ip->update 263 */ 264 static 265 int 266 hammer2_vop_access(struct vop_access_args *ap) 267 { 268 hammer2_inode_t *ip = VTOI(ap->a_vp); 269 uid_t uid; 270 gid_t gid; 271 mode_t mode; 272 uint32_t uflags; 273 int error; 274 int update; 275 276 retry: 277 update = spin_access_start(&ip->cluster_spin); 278 279 /*hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);*/ 280 uid = hammer2_to_unix_xid(&ip->meta.uid); 281 gid = hammer2_to_unix_xid(&ip->meta.gid); 282 mode = ip->meta.mode; 283 uflags = ip->meta.uflags; 284 /*hammer2_inode_unlock(ip);*/ 285 286 if (__predict_false(spin_access_end(&ip->cluster_spin, update))) 287 goto retry; 288 289 error = vop_helper_access(ap, uid, gid, mode, uflags); 290 291 return (error); 292 } 293 294 static 295 int 296 hammer2_vop_getattr(struct vop_getattr_args *ap) 297 { 298 hammer2_pfs_t *pmp; 299 hammer2_inode_t *ip; 300 struct vnode *vp; 301 struct vattr *vap; 302 int update; 303 304 vp = ap->a_vp; 305 vap = ap->a_vap; 306 307 ip = VTOI(vp); 308 pmp = ip->pmp; 309 310 retry: 311 update = spin_access_start(&ip->cluster_spin); 312 313 vap->va_fsid = pmp->mp->mnt_stat.f_fsid.val[0]; 314 vap->va_fileid = ip->meta.inum; 315 vap->va_mode = ip->meta.mode; 316 vap->va_nlink = ip->meta.nlinks; 317 vap->va_uid = hammer2_to_unix_xid(&ip->meta.uid); 318 vap->va_gid = hammer2_to_unix_xid(&ip->meta.gid); 319 vap->va_rmajor = 0; 320 vap->va_rminor = 0; 321 vap->va_size = ip->meta.size; /* protected by shared lock */ 322 vap->va_blocksize = HAMMER2_PBUFSIZE; 323 vap->va_flags = ip->meta.uflags; 324 hammer2_time_to_timespec(ip->meta.ctime, &vap->va_ctime); 325 hammer2_time_to_timespec(ip->meta.mtime, &vap->va_mtime); 326 hammer2_time_to_timespec(ip->meta.mtime, &vap->va_atime); 327 vap->va_gen = 1; 328 vap->va_bytes = 0; 329 if (ip->meta.type == HAMMER2_OBJTYPE_DIRECTORY) { 330 /* 331 * Can't really calculate directory use sans the files under 332 * it, just assume one block for now. 333 */ 334 vap->va_bytes += HAMMER2_INODE_BYTES; 335 } else { 336 vap->va_bytes = hammer2_inode_data_count(ip); 337 } 338 vap->va_type = hammer2_get_vtype(ip->meta.type); 339 vap->va_filerev = 0; 340 vap->va_uid_uuid = ip->meta.uid; 341 vap->va_gid_uuid = ip->meta.gid; 342 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID | 343 VA_FSID_UUID_VALID; 344 345 if (__predict_false(spin_access_end(&ip->cluster_spin, update))) 346 goto retry; 347 348 return (0); 349 } 350 351 static 352 int 353 hammer2_vop_getattr_lite(struct vop_getattr_lite_args *ap) 354 { 355 hammer2_pfs_t *pmp; 356 hammer2_inode_t *ip; 357 struct vnode *vp; 358 struct vattr_lite *lvap; 359 int update; 360 361 vp = ap->a_vp; 362 lvap = ap->a_lvap; 363 364 ip = VTOI(vp); 365 pmp = ip->pmp; 366 367 retry: 368 update = spin_access_start(&ip->cluster_spin); 369 370 #if 0 371 vap->va_fsid = pmp->mp->mnt_stat.f_fsid.val[0]; 372 vap->va_fileid = ip->meta.inum; 373 #endif 374 lvap->va_mode = ip->meta.mode; 375 lvap->va_nlink = ip->meta.nlinks; 376 lvap->va_uid = hammer2_to_unix_xid(&ip->meta.uid); 377 lvap->va_gid = hammer2_to_unix_xid(&ip->meta.gid); 378 #if 0 379 vap->va_rmajor = 0; 380 vap->va_rminor = 0; 381 #endif 382 lvap->va_size = ip->meta.size; 383 #if 0 384 vap->va_blocksize = HAMMER2_PBUFSIZE; 385 #endif 386 lvap->va_flags = ip->meta.uflags; 387 lvap->va_type = hammer2_get_vtype(ip->meta.type); 388 #if 0 389 vap->va_filerev = 0; 390 vap->va_uid_uuid = ip->meta.uid; 391 vap->va_gid_uuid = ip->meta.gid; 392 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID | 393 VA_FSID_UUID_VALID; 394 #endif 395 396 if (__predict_false(spin_access_end(&ip->cluster_spin, update))) 397 goto retry; 398 399 return (0); 400 } 401 402 static 403 int 404 hammer2_vop_setattr(struct vop_setattr_args *ap) 405 { 406 hammer2_inode_t *ip; 407 struct vnode *vp; 408 struct vattr *vap; 409 int error; 410 int kflags = 0; 411 uint64_t ctime; 412 413 vp = ap->a_vp; 414 vap = ap->a_vap; 415 hammer2_update_time(&ctime); 416 417 ip = VTOI(vp); 418 419 if (ip->pmp->ronly) 420 return (EROFS); 421 422 /* 423 * Normally disallow setattr if there is no space, unless we 424 * are in emergency mode (might be needed to chflags -R noschg 425 * files prior to removal). 426 */ 427 if ((ip->pmp->flags & HAMMER2_PMPF_EMERG) == 0 && 428 hammer2_vfs_enospace(ip, 0, ap->a_cred) > 1) { 429 return (ENOSPC); 430 } 431 432 hammer2_trans_init(ip->pmp, 0); 433 hammer2_inode_lock(ip, 0); 434 error = 0; 435 436 if (vap->va_flags != VNOVAL) { 437 uint32_t flags; 438 439 flags = ip->meta.uflags; 440 error = vop_helper_setattr_flags(&flags, vap->va_flags, 441 hammer2_to_unix_xid(&ip->meta.uid), 442 ap->a_cred); 443 if (error == 0) { 444 if (ip->meta.uflags != flags) { 445 hammer2_inode_modify(ip); 446 hammer2_spin_lock_update(&ip->cluster_spin); 447 ip->meta.uflags = flags; 448 ip->meta.ctime = ctime; 449 hammer2_spin_unlock_update(&ip->cluster_spin); 450 kflags |= NOTE_ATTRIB; 451 } 452 if (ip->meta.uflags & (IMMUTABLE | APPEND)) { 453 error = 0; 454 goto done; 455 } 456 } 457 goto done; 458 } 459 if (ip->meta.uflags & (IMMUTABLE | APPEND)) { 460 error = EPERM; 461 goto done; 462 } 463 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 464 mode_t cur_mode = ip->meta.mode; 465 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid); 466 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid); 467 uuid_t uuid_uid; 468 uuid_t uuid_gid; 469 470 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid, 471 ap->a_cred, 472 &cur_uid, &cur_gid, &cur_mode); 473 if (error == 0) { 474 hammer2_guid_to_uuid(&uuid_uid, cur_uid); 475 hammer2_guid_to_uuid(&uuid_gid, cur_gid); 476 if (bcmp(&uuid_uid, &ip->meta.uid, sizeof(uuid_uid)) || 477 bcmp(&uuid_gid, &ip->meta.gid, sizeof(uuid_gid)) || 478 ip->meta.mode != cur_mode 479 ) { 480 hammer2_inode_modify(ip); 481 hammer2_spin_lock_update(&ip->cluster_spin); 482 ip->meta.uid = uuid_uid; 483 ip->meta.gid = uuid_gid; 484 ip->meta.mode = cur_mode; 485 ip->meta.ctime = ctime; 486 hammer2_spin_unlock_update(&ip->cluster_spin); 487 } 488 kflags |= NOTE_ATTRIB; 489 } 490 } 491 492 /* 493 * Resize the file 494 */ 495 if (vap->va_size != VNOVAL && ip->meta.size != vap->va_size) { 496 switch(vp->v_type) { 497 case VREG: 498 if (vap->va_size == ip->meta.size) 499 break; 500 if (vap->va_size < ip->meta.size) { 501 hammer2_mtx_ex(&ip->truncate_lock); 502 hammer2_truncate_file(ip, vap->va_size); 503 hammer2_mtx_unlock(&ip->truncate_lock); 504 kflags |= NOTE_WRITE; 505 } else { 506 hammer2_extend_file(ip, vap->va_size); 507 kflags |= NOTE_WRITE | NOTE_EXTEND; 508 } 509 hammer2_inode_modify(ip); 510 ip->meta.mtime = ctime; 511 vclrflags(vp, VLASTWRITETS); 512 break; 513 default: 514 error = EINVAL; 515 goto done; 516 } 517 } 518 #if 0 519 /* atime not supported */ 520 if (vap->va_atime.tv_sec != VNOVAL) { 521 hammer2_inode_modify(ip); 522 ip->meta.atime = hammer2_timespec_to_time(&vap->va_atime); 523 kflags |= NOTE_ATTRIB; 524 } 525 #endif 526 if (vap->va_mode != (mode_t)VNOVAL) { 527 mode_t cur_mode = ip->meta.mode; 528 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid); 529 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid); 530 531 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred, 532 cur_uid, cur_gid, &cur_mode); 533 if (error == 0) { 534 hammer2_inode_modify(ip); 535 hammer2_spin_lock_update(&ip->cluster_spin); 536 ip->meta.mode = cur_mode; 537 ip->meta.ctime = ctime; 538 hammer2_spin_unlock_update(&ip->cluster_spin); 539 kflags |= NOTE_ATTRIB; 540 } 541 } 542 543 if (vap->va_mtime.tv_sec != VNOVAL) { 544 hammer2_inode_modify(ip); 545 ip->meta.mtime = hammer2_timespec_to_time(&vap->va_mtime); 546 kflags |= NOTE_ATTRIB; 547 vclrflags(vp, VLASTWRITETS); 548 } 549 550 done: 551 /* 552 * If a truncation occurred we must call chain_sync() now in order 553 * to trim the related data chains, otherwise a later expansion can 554 * cause havoc. 555 * 556 * If an extend occured that changed the DIRECTDATA state, we must 557 * call inode_chain_sync now in order to prepare the inode's indirect 558 * block table. 559 * 560 * WARNING! This means we are making an adjustment to the inode's 561 * chain outside of sync/fsync, and not just to inode->meta, which 562 * may result in some consistency issues if a crash were to occur 563 * at just the wrong time. 564 */ 565 if (ip->flags & HAMMER2_INODE_RESIZED) 566 hammer2_inode_chain_sync(ip); 567 568 /* 569 * Cleanup. 570 */ 571 hammer2_inode_unlock(ip); 572 hammer2_trans_done(ip->pmp, HAMMER2_TRANS_SIDEQ); 573 hammer2_knote(ip->vp, kflags); 574 575 return (error); 576 } 577 578 static 579 int 580 hammer2_vop_readdir(struct vop_readdir_args *ap) 581 { 582 hammer2_xop_readdir_t *xop; 583 hammer2_blockref_t bref; 584 hammer2_inode_t *ip; 585 hammer2_tid_t inum; 586 hammer2_key_t lkey; 587 struct uio *uio; 588 off_t *cookies; 589 off_t saveoff; 590 int cookie_index; 591 int ncookies; 592 int error; 593 int eofflag; 594 int r; 595 596 ip = VTOI(ap->a_vp); 597 uio = ap->a_uio; 598 saveoff = uio->uio_offset; 599 eofflag = 0; 600 error = 0; 601 602 /* 603 * Setup cookies directory entry cookies if requested 604 */ 605 if (ap->a_ncookies) { 606 ncookies = uio->uio_resid / 16 + 1; 607 if (ncookies > 1024) 608 ncookies = 1024; 609 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 610 } else { 611 ncookies = -1; 612 cookies = NULL; 613 } 614 cookie_index = 0; 615 616 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED); 617 618 /* 619 * Handle artificial entries. To ensure that only positive 64 bit 620 * quantities are returned to userland we always strip off bit 63. 621 * The hash code is designed such that codes 0x0000-0x7FFF are not 622 * used, allowing us to use these codes for articial entries. 623 * 624 * Entry 0 is used for '.' and entry 1 is used for '..'. Do not 625 * allow '..' to cross the mount point into (e.g.) the super-root. 626 */ 627 if (saveoff == 0) { 628 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK; 629 r = vop_write_dirent(&error, uio, inum, DT_DIR, 1, "."); 630 if (r) 631 goto done; 632 if (cookies) 633 cookies[cookie_index] = saveoff; 634 ++saveoff; 635 ++cookie_index; 636 if (cookie_index == ncookies) 637 goto done; 638 } 639 640 if (saveoff == 1) { 641 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK; 642 if (ip != ip->pmp->iroot) 643 inum = ip->meta.iparent & HAMMER2_DIRHASH_USERMSK; 644 r = vop_write_dirent(&error, uio, inum, DT_DIR, 2, ".."); 645 if (r) 646 goto done; 647 if (cookies) 648 cookies[cookie_index] = saveoff; 649 ++saveoff; 650 ++cookie_index; 651 if (cookie_index == ncookies) 652 goto done; 653 } 654 655 lkey = saveoff | HAMMER2_DIRHASH_VISIBLE; 656 if (hammer2_debug & 0x0020) 657 kprintf("readdir: lkey %016jx\n", lkey); 658 if (error) 659 goto done; 660 661 xop = hammer2_xop_alloc(ip, 0); 662 xop->lkey = lkey; 663 hammer2_xop_start(&xop->head, &hammer2_readdir_desc); 664 665 for (;;) { 666 const hammer2_inode_data_t *ripdata; 667 const char *dname; 668 int dtype; 669 670 error = hammer2_xop_collect(&xop->head, 0); 671 error = hammer2_error_to_errno(error); 672 if (error) { 673 break; 674 } 675 if (cookie_index == ncookies) 676 break; 677 if (hammer2_debug & 0x0020) 678 kprintf("cluster chain %p %p\n", 679 xop->head.cluster.focus, 680 (xop->head.cluster.focus ? 681 xop->head.cluster.focus->data : (void *)-1)); 682 hammer2_cluster_bref(&xop->head.cluster, &bref); 683 684 if (bref.type == HAMMER2_BREF_TYPE_INODE) { 685 ripdata = &hammer2_xop_gdata(&xop->head)->ipdata; 686 dtype = hammer2_get_dtype(ripdata->meta.type); 687 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK; 688 r = vop_write_dirent(&error, uio, 689 ripdata->meta.inum & 690 HAMMER2_DIRHASH_USERMSK, 691 dtype, 692 ripdata->meta.name_len, 693 ripdata->filename); 694 hammer2_xop_pdata(&xop->head); 695 if (r) 696 break; 697 if (cookies) 698 cookies[cookie_index] = saveoff; 699 ++cookie_index; 700 } else if (bref.type == HAMMER2_BREF_TYPE_DIRENT) { 701 uint16_t namlen; 702 703 dtype = hammer2_get_dtype(bref.embed.dirent.type); 704 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK; 705 namlen = bref.embed.dirent.namlen; 706 if (namlen <= sizeof(bref.check.buf)) { 707 dname = bref.check.buf; 708 } else { 709 dname = hammer2_xop_gdata(&xop->head)->buf; 710 } 711 r = vop_write_dirent(&error, uio, 712 bref.embed.dirent.inum, dtype, 713 namlen, dname); 714 if (namlen > sizeof(bref.check.buf)) 715 hammer2_xop_pdata(&xop->head); 716 if (r) 717 break; 718 if (cookies) 719 cookies[cookie_index] = saveoff; 720 ++cookie_index; 721 } else { 722 /* XXX chain error */ 723 kprintf("bad chain type readdir %d\n", bref.type); 724 } 725 } 726 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 727 if (error == ENOENT) { 728 error = 0; 729 eofflag = 1; 730 saveoff = (hammer2_key_t)-1; 731 } else { 732 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK; 733 } 734 done: 735 hammer2_inode_unlock(ip); 736 if (ap->a_eofflag) 737 *ap->a_eofflag = eofflag; 738 if (hammer2_debug & 0x0020) 739 kprintf("readdir: done at %016jx\n", saveoff); 740 uio->uio_offset = saveoff & ~HAMMER2_DIRHASH_VISIBLE; 741 if (error && cookie_index == 0) { 742 if (cookies) { 743 kfree(cookies, M_TEMP); 744 *ap->a_ncookies = 0; 745 *ap->a_cookies = NULL; 746 } 747 } else { 748 if (cookies) { 749 *ap->a_ncookies = cookie_index; 750 *ap->a_cookies = cookies; 751 } 752 } 753 return (error); 754 } 755 756 /* 757 * hammer2_vop_readlink { vp, uio, cred } 758 */ 759 static 760 int 761 hammer2_vop_readlink(struct vop_readlink_args *ap) 762 { 763 struct vnode *vp; 764 hammer2_inode_t *ip; 765 int error; 766 767 vp = ap->a_vp; 768 if (vp->v_type != VLNK) 769 return (EINVAL); 770 ip = VTOI(vp); 771 772 error = hammer2_read_file(ip, ap->a_uio, 0); 773 return (error); 774 } 775 776 static 777 int 778 hammer2_vop_read(struct vop_read_args *ap) 779 { 780 struct vnode *vp; 781 hammer2_inode_t *ip; 782 struct uio *uio; 783 int error; 784 int seqcount; 785 786 /* 787 * Read operations supported on this vnode? 788 */ 789 vp = ap->a_vp; 790 if (vp->v_type == VDIR) 791 return (EISDIR); 792 if (vp->v_type != VREG) 793 return (EINVAL); 794 795 /* 796 * Misc 797 */ 798 ip = VTOI(vp); 799 uio = ap->a_uio; 800 error = 0; 801 802 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 803 804 error = hammer2_read_file(ip, uio, seqcount); 805 return (error); 806 } 807 808 static 809 int 810 hammer2_vop_write(struct vop_write_args *ap) 811 { 812 hammer2_inode_t *ip; 813 thread_t td; 814 struct vnode *vp; 815 struct uio *uio; 816 int error; 817 int seqcount; 818 int ioflag; 819 820 /* 821 * Read operations supported on this vnode? 822 */ 823 vp = ap->a_vp; 824 if (vp->v_type != VREG) 825 return (EINVAL); 826 827 /* 828 * Misc 829 */ 830 ip = VTOI(vp); 831 ioflag = ap->a_ioflag; 832 uio = ap->a_uio; 833 error = 0; 834 if (ip->pmp->ronly || (ip->pmp->flags & HAMMER2_PMPF_EMERG)) 835 return (EROFS); 836 switch (hammer2_vfs_enospace(ip, uio->uio_resid, ap->a_cred)) { 837 case 2: 838 return (ENOSPC); 839 case 1: 840 ioflag |= IO_DIRECT; /* semi-synchronous */ 841 /* fall through */ 842 default: 843 break; 844 } 845 846 seqcount = ioflag >> IO_SEQSHIFT; 847 848 /* 849 * Check resource limit 850 */ 851 if (uio->uio_resid > 0 && (td = uio->uio_td) != NULL && td->td_proc && 852 uio->uio_offset + uio->uio_resid > 853 td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 854 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ); 855 return (EFBIG); 856 } 857 858 /* 859 * The transaction interlocks against flush initiations 860 * (note: but will run concurrently with the actual flush). 861 * 862 * To avoid deadlocking against the VM system, we must flag any 863 * transaction related to the buffer cache or other direct 864 * VM page manipulation. 865 */ 866 if (uio->uio_segflg == UIO_NOCOPY) { 867 hammer2_trans_init(ip->pmp, HAMMER2_TRANS_BUFCACHE); 868 } else { 869 hammer2_trans_init(ip->pmp, 0); 870 } 871 error = hammer2_write_file(ip, uio, ioflag, seqcount); 872 if (uio->uio_segflg == UIO_NOCOPY) 873 hammer2_trans_done(ip->pmp, HAMMER2_TRANS_BUFCACHE | 874 HAMMER2_TRANS_SIDEQ); 875 else 876 hammer2_trans_done(ip->pmp, HAMMER2_TRANS_SIDEQ); 877 878 return (error); 879 } 880 881 /* 882 * Perform read operations on a file or symlink given an UNLOCKED 883 * inode and uio. 884 * 885 * The passed ip is not locked. 886 */ 887 static 888 int 889 hammer2_read_file(hammer2_inode_t *ip, struct uio *uio, int seqcount) 890 { 891 hammer2_off_t size; 892 struct buf *bp; 893 int error; 894 895 error = 0; 896 897 /* 898 * UIO read loop. 899 * 900 * WARNING! Assumes that the kernel interlocks size changes at the 901 * vnode level. 902 */ 903 hammer2_mtx_sh(&ip->lock); 904 hammer2_mtx_sh(&ip->truncate_lock); 905 size = ip->meta.size; 906 hammer2_mtx_unlock(&ip->lock); 907 908 while (uio->uio_resid > 0 && uio->uio_offset < size) { 909 hammer2_key_t lbase; 910 hammer2_key_t leof; 911 int lblksize; 912 int loff; 913 int n; 914 915 lblksize = hammer2_calc_logical(ip, uio->uio_offset, 916 &lbase, &leof); 917 918 #if 1 919 bp = NULL; 920 error = cluster_readx(ip->vp, leof, lbase, lblksize, 921 B_NOTMETA | B_KVABIO, 922 uio->uio_resid, 923 seqcount * MAXBSIZE, 924 &bp); 925 #else 926 if (uio->uio_segflg == UIO_NOCOPY) { 927 bp = getblk(ip->vp, lbase, lblksize, 928 GETBLK_BHEAVY | GETBLK_KVABIO, 0); 929 if (bp->b_flags & B_CACHE) { 930 int i; 931 int j = 0; 932 if (bp->b_xio.xio_npages != 16) 933 kprintf("NPAGES BAD\n"); 934 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 935 vm_page_t m; 936 m = bp->b_xio.xio_pages[i]; 937 if (m == NULL || m->valid == 0) { 938 kprintf("bp %016jx %016jx pg %d inv", 939 lbase, leof, i); 940 if (m) 941 kprintf("m->object %p/%p", m->object, ip->vp->v_object); 942 kprintf("\n"); 943 j = 1; 944 } 945 } 946 if (j) 947 kprintf("b_flags %08x, b_error %d\n", bp->b_flags, bp->b_error); 948 } 949 bqrelse(bp); 950 } 951 error = bread_kvabio(ip->vp, lbase, lblksize, &bp); 952 #endif 953 if (error) { 954 brelse(bp); 955 break; 956 } 957 bkvasync(bp); 958 loff = (int)(uio->uio_offset - lbase); 959 n = lblksize - loff; 960 if (n > uio->uio_resid) 961 n = uio->uio_resid; 962 if (n > size - uio->uio_offset) 963 n = (int)(size - uio->uio_offset); 964 bp->b_flags |= B_AGE; 965 uiomovebp(bp, (char *)bp->b_data + loff, n, uio); 966 bqrelse(bp); 967 } 968 hammer2_mtx_unlock(&ip->truncate_lock); 969 970 return (error); 971 } 972 973 /* 974 * Write to the file represented by the inode via the logical buffer cache. 975 * The inode may represent a regular file or a symlink. 976 * 977 * The inode must not be locked. 978 */ 979 static 980 int 981 hammer2_write_file(hammer2_inode_t *ip, struct uio *uio, 982 int ioflag, int seqcount) 983 { 984 hammer2_key_t old_eof; 985 hammer2_key_t new_eof; 986 struct buf *bp; 987 int kflags; 988 int error; 989 int modified; 990 991 /* 992 * Setup if append 993 * 994 * WARNING! Assumes that the kernel interlocks size changes at the 995 * vnode level. 996 */ 997 hammer2_mtx_ex(&ip->lock); 998 hammer2_mtx_sh(&ip->truncate_lock); 999 if (ioflag & IO_APPEND) 1000 uio->uio_offset = ip->meta.size; 1001 old_eof = ip->meta.size; 1002 1003 /* 1004 * Extend the file if necessary. If the write fails at some point 1005 * we will truncate it back down to cover as much as we were able 1006 * to write. 1007 * 1008 * Doing this now makes it easier to calculate buffer sizes in 1009 * the loop. 1010 */ 1011 kflags = 0; 1012 error = 0; 1013 modified = 0; 1014 1015 if (uio->uio_offset + uio->uio_resid > old_eof) { 1016 new_eof = uio->uio_offset + uio->uio_resid; 1017 modified = 1; 1018 hammer2_extend_file(ip, new_eof); 1019 kflags |= NOTE_EXTEND; 1020 } else { 1021 new_eof = old_eof; 1022 } 1023 hammer2_mtx_unlock(&ip->lock); 1024 1025 /* 1026 * UIO write loop 1027 */ 1028 while (uio->uio_resid > 0) { 1029 hammer2_key_t lbase; 1030 int trivial; 1031 int endofblk; 1032 int lblksize; 1033 int loff; 1034 int n; 1035 1036 /* 1037 * Don't allow the buffer build to blow out the buffer 1038 * cache. 1039 */ 1040 if ((ioflag & IO_RECURSE) == 0) 1041 bwillwrite(HAMMER2_PBUFSIZE); 1042 1043 /* 1044 * This nominally tells us how much we can cluster and 1045 * what the logical buffer size needs to be. Currently 1046 * we don't try to cluster the write and just handle one 1047 * block at a time. 1048 */ 1049 lblksize = hammer2_calc_logical(ip, uio->uio_offset, 1050 &lbase, NULL); 1051 loff = (int)(uio->uio_offset - lbase); 1052 1053 KKASSERT(lblksize <= MAXBSIZE); 1054 1055 /* 1056 * Calculate bytes to copy this transfer and whether the 1057 * copy completely covers the buffer or not. 1058 */ 1059 trivial = 0; 1060 n = lblksize - loff; 1061 if (n > uio->uio_resid) { 1062 n = uio->uio_resid; 1063 if (loff == lbase && uio->uio_offset + n == new_eof) 1064 trivial = 1; 1065 endofblk = 0; 1066 } else { 1067 if (loff == 0) 1068 trivial = 1; 1069 endofblk = 1; 1070 } 1071 if (lbase >= new_eof) 1072 trivial = 1; 1073 1074 /* 1075 * Get the buffer 1076 */ 1077 if (uio->uio_segflg == UIO_NOCOPY) { 1078 /* 1079 * Issuing a write with the same data backing the 1080 * buffer. Instantiate the buffer to collect the 1081 * backing vm pages, then read-in any missing bits. 1082 * 1083 * This case is used by vop_stdputpages(). 1084 */ 1085 bp = getblk(ip->vp, lbase, lblksize, 1086 GETBLK_BHEAVY | GETBLK_KVABIO, 0); 1087 if ((bp->b_flags & B_CACHE) == 0) { 1088 bqrelse(bp); 1089 error = bread_kvabio(ip->vp, lbase, 1090 lblksize, &bp); 1091 } 1092 } else if (trivial) { 1093 /* 1094 * Even though we are entirely overwriting the buffer 1095 * we may still have to zero it out to avoid a 1096 * mmap/write visibility issue. 1097 */ 1098 bp = getblk(ip->vp, lbase, lblksize, 1099 GETBLK_BHEAVY | GETBLK_KVABIO, 0); 1100 if ((bp->b_flags & B_CACHE) == 0) 1101 vfs_bio_clrbuf(bp); 1102 } else { 1103 /* 1104 * Partial overwrite, read in any missing bits then 1105 * replace the portion being written. 1106 * 1107 * (The strategy code will detect zero-fill physical 1108 * blocks for this case). 1109 */ 1110 error = bread_kvabio(ip->vp, lbase, lblksize, &bp); 1111 if (error == 0) 1112 bheavy(bp); 1113 } 1114 1115 if (error) { 1116 brelse(bp); 1117 break; 1118 } 1119 1120 /* 1121 * Ok, copy the data in 1122 */ 1123 bkvasync(bp); 1124 error = uiomovebp(bp, bp->b_data + loff, n, uio); 1125 kflags |= NOTE_WRITE; 1126 modified = 1; 1127 if (error) { 1128 brelse(bp); 1129 break; 1130 } 1131 1132 /* 1133 * WARNING: Pageout daemon will issue UIO_NOCOPY writes 1134 * with IO_SYNC or IO_ASYNC set. These writes 1135 * must be handled as the pageout daemon expects. 1136 * 1137 * NOTE! H2 relies on cluster_write() here because it 1138 * cannot preallocate disk blocks at the logical 1139 * level due to not knowing what the compression 1140 * size will be at this time. 1141 * 1142 * We must use cluster_write() here and we depend 1143 * on the write-behind feature to flush buffers 1144 * appropriately. If we let the buffer daemons do 1145 * it the block allocations will be all over the 1146 * map. 1147 */ 1148 if (ioflag & IO_SYNC) { 1149 bwrite(bp); 1150 } else if ((ioflag & IO_DIRECT) && endofblk) { 1151 bawrite(bp); 1152 } else if (ioflag & IO_ASYNC) { 1153 bawrite(bp); 1154 } else if (ip->vp->v_mount->mnt_flag & MNT_NOCLUSTERW) { 1155 bdwrite(bp); 1156 } else { 1157 #if 1 1158 bp->b_flags |= B_CLUSTEROK; 1159 cluster_write(bp, new_eof, lblksize, seqcount); 1160 #else 1161 bp->b_flags |= B_CLUSTEROK; 1162 bdwrite(bp); 1163 #endif 1164 } 1165 } 1166 1167 /* 1168 * Cleanup. If we extended the file EOF but failed to write through 1169 * the entire write is a failure and we have to back-up. 1170 */ 1171 if (error && new_eof != old_eof) { 1172 hammer2_mtx_unlock(&ip->truncate_lock); 1173 hammer2_mtx_ex(&ip->lock); /* note lock order */ 1174 hammer2_mtx_ex(&ip->truncate_lock); /* note lock order */ 1175 hammer2_truncate_file(ip, old_eof); 1176 if (ip->flags & HAMMER2_INODE_MODIFIED) 1177 hammer2_inode_chain_sync(ip); 1178 hammer2_mtx_unlock(&ip->lock); 1179 } else if (modified) { 1180 struct vnode *vp = ip->vp; 1181 1182 hammer2_mtx_ex(&ip->lock); 1183 hammer2_inode_modify(ip); 1184 if (uio->uio_segflg == UIO_NOCOPY) { 1185 if (vp->v_flag & VLASTWRITETS) { 1186 ip->meta.mtime = 1187 (unsigned long)vp->v_lastwrite_ts.tv_sec * 1188 1000000 + 1189 vp->v_lastwrite_ts.tv_nsec / 1000; 1190 } 1191 } else { 1192 hammer2_update_time(&ip->meta.mtime); 1193 vclrflags(vp, VLASTWRITETS); 1194 } 1195 1196 #if 0 1197 /* 1198 * REMOVED - handled by hammer2_extend_file(). Do not issue 1199 * a chain_sync() outside of a sync/fsync except for DIRECTDATA 1200 * state changes. 1201 * 1202 * Under normal conditions we only issue a chain_sync if 1203 * the inode's DIRECTDATA state changed. 1204 */ 1205 if (ip->flags & HAMMER2_INODE_RESIZED) 1206 hammer2_inode_chain_sync(ip); 1207 #endif 1208 hammer2_mtx_unlock(&ip->lock); 1209 hammer2_knote(ip->vp, kflags); 1210 } 1211 hammer2_trans_assert_strategy(ip->pmp); 1212 hammer2_mtx_unlock(&ip->truncate_lock); 1213 1214 return error; 1215 } 1216 1217 /* 1218 * Truncate the size of a file. The inode must be locked. 1219 * 1220 * We must unconditionally set HAMMER2_INODE_RESIZED to properly 1221 * ensure that any on-media data beyond the new file EOF has been destroyed. 1222 * 1223 * WARNING: nvtruncbuf() can only be safely called without the inode lock 1224 * held due to the way our write thread works. If the truncation 1225 * occurs in the middle of a buffer, nvtruncbuf() is responsible 1226 * for dirtying that buffer and zeroing out trailing bytes. 1227 * 1228 * WARNING! Assumes that the kernel interlocks size changes at the 1229 * vnode level. 1230 * 1231 * WARNING! Caller assumes responsibility for removing dead blocks 1232 * if INODE_RESIZED is set. 1233 */ 1234 static 1235 void 1236 hammer2_truncate_file(hammer2_inode_t *ip, hammer2_key_t nsize) 1237 { 1238 hammer2_key_t lbase; 1239 int nblksize; 1240 1241 hammer2_mtx_unlock(&ip->lock); 1242 if (ip->vp) { 1243 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL); 1244 nvtruncbuf(ip->vp, nsize, 1245 nblksize, (int)nsize & (nblksize - 1), 1246 0); 1247 } 1248 hammer2_mtx_ex(&ip->lock); 1249 KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0); 1250 ip->osize = ip->meta.size; 1251 ip->meta.size = nsize; 1252 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED); 1253 hammer2_inode_modify(ip); 1254 } 1255 1256 /* 1257 * Extend the size of a file. The inode must be locked. 1258 * 1259 * Even though the file size is changing, we do not have to set the 1260 * INODE_RESIZED bit unless the file size crosses the EMBEDDED_BYTES 1261 * boundary. When this occurs a hammer2_inode_chain_sync() is required 1262 * to prepare the inode cluster's indirect block table, otherwise 1263 * async execution of the strategy code will implode on us. 1264 * 1265 * WARNING! Assumes that the kernel interlocks size changes at the 1266 * vnode level. 1267 * 1268 * WARNING! Caller assumes responsibility for transitioning out 1269 * of the inode DIRECTDATA mode if INODE_RESIZED is set. 1270 */ 1271 static 1272 void 1273 hammer2_extend_file(hammer2_inode_t *ip, hammer2_key_t nsize) 1274 { 1275 hammer2_key_t lbase; 1276 hammer2_key_t osize; 1277 int oblksize; 1278 int nblksize; 1279 int error; 1280 1281 KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0); 1282 hammer2_inode_modify(ip); 1283 osize = ip->meta.size; 1284 ip->osize = osize; 1285 ip->meta.size = nsize; 1286 1287 /* 1288 * We must issue a chain_sync() when the DIRECTDATA state changes 1289 * to prevent confusion between the flush code and the in-memory 1290 * state. This is not perfect because we are doing it outside of 1291 * a sync/fsync operation, so it might not be fully synchronized 1292 * with the meta-data topology flush. 1293 * 1294 * We must retain and re-dirty the buffer cache buffer containing 1295 * the direct data so it can be written to a real block. It should 1296 * not be possible for a bread error to occur since the original data 1297 * is extracted from the inode structure directly. 1298 */ 1299 if (osize <= HAMMER2_EMBEDDED_BYTES && nsize > HAMMER2_EMBEDDED_BYTES) { 1300 if (osize) { 1301 struct buf *bp; 1302 1303 oblksize = hammer2_calc_logical(ip, 0, NULL, NULL); 1304 error = bread_kvabio(ip->vp, 0, oblksize, &bp); 1305 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED); 1306 hammer2_inode_chain_sync(ip); 1307 if (error == 0) { 1308 bheavy(bp); 1309 bdwrite(bp); 1310 } else { 1311 brelse(bp); 1312 } 1313 } else { 1314 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED); 1315 hammer2_inode_chain_sync(ip); 1316 } 1317 } 1318 hammer2_mtx_unlock(&ip->lock); 1319 if (ip->vp) { 1320 oblksize = hammer2_calc_logical(ip, osize, &lbase, NULL); 1321 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL); 1322 nvextendbuf(ip->vp, 1323 osize, nsize, 1324 oblksize, nblksize, 1325 -1, -1, 0); 1326 } 1327 hammer2_mtx_ex(&ip->lock); 1328 } 1329 1330 static 1331 int 1332 hammer2_vop_nresolve(struct vop_nresolve_args *ap) 1333 { 1334 hammer2_xop_nresolve_t *xop; 1335 hammer2_inode_t *ip; 1336 hammer2_inode_t *dip; 1337 struct namecache *ncp; 1338 struct vnode *vp; 1339 int error; 1340 1341 dip = VTOI(ap->a_dvp); 1342 xop = hammer2_xop_alloc(dip, 0); 1343 1344 ncp = ap->a_nch->ncp; 1345 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen); 1346 1347 /* 1348 * Note: In DragonFly the kernel handles '.' and '..'. 1349 */ 1350 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1351 hammer2_xop_start(&xop->head, &hammer2_nresolve_desc); 1352 1353 error = hammer2_xop_collect(&xop->head, 0); 1354 error = hammer2_error_to_errno(error); 1355 if (error) { 1356 ip = NULL; 1357 } else { 1358 ip = hammer2_inode_get(dip->pmp, &xop->head, -1, -1); 1359 } 1360 hammer2_inode_unlock(dip); 1361 1362 /* 1363 * Acquire the related vnode 1364 * 1365 * NOTE: For error processing, only ENOENT resolves the namecache 1366 * entry to NULL, otherwise we just return the error and 1367 * leave the namecache unresolved. 1368 * 1369 * WARNING: inode structure is locked exclusively via inode_get 1370 * but chain was locked shared. inode_unlock() 1371 * will handle it properly. 1372 */ 1373 if (ip) { 1374 vp = hammer2_igetv(ip, &error); /* error set to UNIX error */ 1375 if (error == 0) { 1376 vn_unlock(vp); 1377 cache_setvp(ap->a_nch, vp); 1378 } else if (error == ENOENT) { 1379 cache_setvp(ap->a_nch, NULL); 1380 } 1381 hammer2_inode_unlock(ip); 1382 1383 /* 1384 * The vp should not be released until after we've disposed 1385 * of our locks, because it might cause vop_inactive() to 1386 * be called. 1387 */ 1388 if (vp) 1389 vrele(vp); 1390 } else { 1391 error = ENOENT; 1392 cache_setvp(ap->a_nch, NULL); 1393 } 1394 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1395 KASSERT(error || ap->a_nch->ncp->nc_vp != NULL, 1396 ("resolve error %d/%p ap %p\n", 1397 error, ap->a_nch->ncp->nc_vp, ap)); 1398 1399 return error; 1400 } 1401 1402 static 1403 int 1404 hammer2_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap) 1405 { 1406 hammer2_inode_t *dip; 1407 hammer2_tid_t inum; 1408 int error; 1409 1410 dip = VTOI(ap->a_dvp); 1411 inum = dip->meta.iparent; 1412 *ap->a_vpp = NULL; 1413 1414 if (inum) { 1415 error = hammer2_vfs_vget(ap->a_dvp->v_mount, NULL, 1416 inum, ap->a_vpp); 1417 } else { 1418 error = ENOENT; 1419 } 1420 return error; 1421 } 1422 1423 static 1424 int 1425 hammer2_vop_nmkdir(struct vop_nmkdir_args *ap) 1426 { 1427 hammer2_inode_t *dip; 1428 hammer2_inode_t *nip; 1429 struct namecache *ncp; 1430 const char *name; 1431 size_t name_len; 1432 hammer2_tid_t inum; 1433 int error; 1434 1435 dip = VTOI(ap->a_dvp); 1436 if (dip->pmp->ronly || (dip->pmp->flags & HAMMER2_PMPF_EMERG)) 1437 return (EROFS); 1438 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1439 return (ENOSPC); 1440 1441 ncp = ap->a_nch->ncp; 1442 name = ncp->nc_name; 1443 name_len = ncp->nc_nlen; 1444 1445 hammer2_trans_init(dip->pmp, 0); 1446 1447 inum = hammer2_trans_newinum(dip->pmp); 1448 1449 /* 1450 * Create the actual inode as a hidden file in the iroot, then 1451 * create the directory entry. The creation of the actual inode 1452 * sets its nlinks to 1 which is the value we desire. 1453 * 1454 * dip must be locked before nip to avoid deadlock. 1455 */ 1456 hammer2_inode_lock(dip, 0); 1457 nip = hammer2_inode_create_normal(dip, ap->a_vap, ap->a_cred, 1458 inum, &error); 1459 if (error) { 1460 error = hammer2_error_to_errno(error); 1461 } else { 1462 error = hammer2_dirent_create(dip, name, name_len, 1463 nip->meta.inum, nip->meta.type); 1464 /* returns UNIX error code */ 1465 } 1466 if (error) { 1467 if (nip) { 1468 hammer2_inode_unlink_finisher(nip, NULL); 1469 hammer2_inode_unlock(nip); 1470 nip = NULL; 1471 } 1472 *ap->a_vpp = NULL; 1473 } else { 1474 /* 1475 * inode_depend() must occur before the igetv() because 1476 * the igetv() can temporarily release the inode lock. 1477 */ 1478 hammer2_inode_depend(dip, nip); /* before igetv */ 1479 *ap->a_vpp = hammer2_igetv(nip, &error); 1480 hammer2_inode_unlock(nip); 1481 } 1482 1483 /* 1484 * Update dip's mtime 1485 * 1486 * We can use a shared inode lock and allow the meta.mtime update 1487 * SMP race. hammer2_inode_modify() is MPSAFE w/a shared lock. 1488 */ 1489 if (error == 0) { 1490 uint64_t mtime; 1491 1492 /*hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);*/ 1493 hammer2_update_time(&mtime); 1494 hammer2_inode_modify(dip); 1495 dip->meta.mtime = mtime; 1496 /*hammer2_inode_unlock(dip);*/ 1497 } 1498 hammer2_inode_unlock(dip); 1499 1500 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 1501 1502 if (error == 0) { 1503 cache_setunresolved(ap->a_nch); 1504 cache_setvp(ap->a_nch, *ap->a_vpp); 1505 hammer2_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1506 } 1507 return error; 1508 } 1509 1510 static 1511 int 1512 hammer2_vop_open(struct vop_open_args *ap) 1513 { 1514 return vop_stdopen(ap); 1515 } 1516 1517 /* 1518 * hammer2_vop_advlock { vp, id, op, fl, flags } 1519 */ 1520 static 1521 int 1522 hammer2_vop_advlock(struct vop_advlock_args *ap) 1523 { 1524 hammer2_inode_t *ip = VTOI(ap->a_vp); 1525 hammer2_off_t size; 1526 1527 size = ip->meta.size; 1528 return (lf_advlock(ap, &ip->advlock, size)); 1529 } 1530 1531 static 1532 int 1533 hammer2_vop_close(struct vop_close_args *ap) 1534 { 1535 return vop_stdclose(ap); 1536 } 1537 1538 /* 1539 * hammer2_vop_nlink { nch, dvp, vp, cred } 1540 * 1541 * Create a hardlink from (vp) to {dvp, nch}. 1542 */ 1543 static 1544 int 1545 hammer2_vop_nlink(struct vop_nlink_args *ap) 1546 { 1547 hammer2_inode_t *tdip; /* target directory to create link in */ 1548 hammer2_inode_t *ip; /* inode we are hardlinking to */ 1549 struct namecache *ncp; 1550 const char *name; 1551 size_t name_len; 1552 int error; 1553 uint64_t cmtime; 1554 1555 if (ap->a_dvp->v_mount != ap->a_vp->v_mount) 1556 return(EXDEV); 1557 1558 tdip = VTOI(ap->a_dvp); 1559 if (tdip->pmp->ronly || (tdip->pmp->flags & HAMMER2_PMPF_EMERG)) 1560 return (EROFS); 1561 if (hammer2_vfs_enospace(tdip, 0, ap->a_cred) > 1) 1562 return (ENOSPC); 1563 1564 ncp = ap->a_nch->ncp; 1565 name = ncp->nc_name; 1566 name_len = ncp->nc_nlen; 1567 1568 /* 1569 * ip represents the file being hardlinked. The file could be a 1570 * normal file or a hardlink target if it has already been hardlinked. 1571 * (with the new semantics, it will almost always be a hardlink 1572 * target). 1573 * 1574 * Bump nlinks and potentially also create or move the hardlink 1575 * target in the parent directory common to (ip) and (tdip). The 1576 * consolidation code can modify ip->cluster. The returned cluster 1577 * is locked. 1578 */ 1579 ip = VTOI(ap->a_vp); 1580 KASSERT(ip->pmp, ("ip->pmp is NULL %p %p", ip, ip->pmp)); 1581 hammer2_trans_init(ip->pmp, 0); 1582 1583 /* 1584 * Target should be an indexed inode or there's no way we will ever 1585 * be able to find it! 1586 */ 1587 KKASSERT((ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE) == 0); 1588 1589 error = 0; 1590 1591 /* 1592 * Can return NULL and error == EXDEV if the common parent 1593 * crosses a directory with the xlink flag set. 1594 */ 1595 hammer2_inode_lock4(tdip, ip, NULL, NULL); 1596 1597 hammer2_update_time(&cmtime); 1598 1599 /* 1600 * Create the directory entry and bump nlinks. 1601 * Also update ip's ctime. 1602 */ 1603 if (error == 0) { 1604 error = hammer2_dirent_create(tdip, name, name_len, 1605 ip->meta.inum, ip->meta.type); 1606 hammer2_inode_modify(ip); 1607 ++ip->meta.nlinks; 1608 ip->meta.ctime = cmtime; 1609 } 1610 if (error == 0) { 1611 /* 1612 * Update dip's [cm]time 1613 */ 1614 hammer2_inode_modify(tdip); 1615 tdip->meta.mtime = cmtime; 1616 tdip->meta.ctime = cmtime; 1617 1618 cache_setunresolved(ap->a_nch); 1619 cache_setvp(ap->a_nch, ap->a_vp); 1620 } 1621 hammer2_inode_unlock(ip); 1622 hammer2_inode_unlock(tdip); 1623 1624 hammer2_trans_done(ip->pmp, HAMMER2_TRANS_SIDEQ); 1625 hammer2_knote(ap->a_vp, NOTE_LINK); 1626 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1627 1628 return error; 1629 } 1630 1631 /* 1632 * hammer2_vop_ncreate { nch, dvp, vpp, cred, vap } 1633 * 1634 * The operating system has already ensured that the directory entry 1635 * does not exist and done all appropriate namespace locking. 1636 */ 1637 static 1638 int 1639 hammer2_vop_ncreate(struct vop_ncreate_args *ap) 1640 { 1641 hammer2_inode_t *dip; 1642 hammer2_inode_t *nip; 1643 struct namecache *ncp; 1644 const char *name; 1645 size_t name_len; 1646 hammer2_tid_t inum; 1647 int error; 1648 1649 dip = VTOI(ap->a_dvp); 1650 if (dip->pmp->ronly || (dip->pmp->flags & HAMMER2_PMPF_EMERG)) 1651 return (EROFS); 1652 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1653 return (ENOSPC); 1654 1655 ncp = ap->a_nch->ncp; 1656 name = ncp->nc_name; 1657 name_len = ncp->nc_nlen; 1658 hammer2_trans_init(dip->pmp, 0); 1659 1660 inum = hammer2_trans_newinum(dip->pmp); 1661 1662 /* 1663 * Create the actual inode as a hidden file in the iroot, then 1664 * create the directory entry. The creation of the actual inode 1665 * sets its nlinks to 1 which is the value we desire. 1666 * 1667 * dip must be locked before nip to avoid deadlock. 1668 */ 1669 hammer2_inode_lock(dip, 0); 1670 nip = hammer2_inode_create_normal(dip, ap->a_vap, ap->a_cred, 1671 inum, &error); 1672 1673 if (error) { 1674 error = hammer2_error_to_errno(error); 1675 } else { 1676 error = hammer2_dirent_create(dip, name, name_len, 1677 nip->meta.inum, nip->meta.type); 1678 } 1679 if (error) { 1680 if (nip) { 1681 hammer2_inode_unlink_finisher(nip, NULL); 1682 hammer2_inode_unlock(nip); 1683 nip = NULL; 1684 } 1685 *ap->a_vpp = NULL; 1686 } else { 1687 hammer2_inode_depend(dip, nip); /* before igetv */ 1688 *ap->a_vpp = hammer2_igetv(nip, &error); 1689 hammer2_inode_unlock(nip); 1690 } 1691 1692 /* 1693 * Update dip's mtime 1694 */ 1695 if (error == 0) { 1696 uint64_t mtime; 1697 1698 /*hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);*/ 1699 hammer2_update_time(&mtime); 1700 hammer2_inode_modify(dip); 1701 dip->meta.mtime = mtime; 1702 /*hammer2_inode_unlock(dip);*/ 1703 } 1704 hammer2_inode_unlock(dip); 1705 1706 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 1707 1708 if (error == 0) { 1709 cache_setunresolved(ap->a_nch); 1710 cache_setvp(ap->a_nch, *ap->a_vpp); 1711 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1712 } 1713 return error; 1714 } 1715 1716 /* 1717 * Make a device node (typically a fifo) 1718 */ 1719 static 1720 int 1721 hammer2_vop_nmknod(struct vop_nmknod_args *ap) 1722 { 1723 hammer2_inode_t *dip; 1724 hammer2_inode_t *nip; 1725 struct namecache *ncp; 1726 const char *name; 1727 size_t name_len; 1728 hammer2_tid_t inum; 1729 int error; 1730 1731 dip = VTOI(ap->a_dvp); 1732 if (dip->pmp->ronly || (dip->pmp->flags & HAMMER2_PMPF_EMERG)) 1733 return (EROFS); 1734 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1735 return (ENOSPC); 1736 1737 ncp = ap->a_nch->ncp; 1738 name = ncp->nc_name; 1739 name_len = ncp->nc_nlen; 1740 hammer2_trans_init(dip->pmp, 0); 1741 1742 /* 1743 * Create the device inode and then create the directory entry. 1744 * 1745 * dip must be locked before nip to avoid deadlock. 1746 */ 1747 inum = hammer2_trans_newinum(dip->pmp); 1748 1749 hammer2_inode_lock(dip, 0); 1750 nip = hammer2_inode_create_normal(dip, ap->a_vap, ap->a_cred, 1751 inum, &error); 1752 if (error == 0) { 1753 error = hammer2_dirent_create(dip, name, name_len, 1754 nip->meta.inum, nip->meta.type); 1755 } 1756 if (error) { 1757 if (nip) { 1758 hammer2_inode_unlink_finisher(nip, NULL); 1759 hammer2_inode_unlock(nip); 1760 nip = NULL; 1761 } 1762 *ap->a_vpp = NULL; 1763 } else { 1764 hammer2_inode_depend(dip, nip); /* before igetv */ 1765 *ap->a_vpp = hammer2_igetv(nip, &error); 1766 hammer2_inode_unlock(nip); 1767 } 1768 1769 /* 1770 * Update dip's mtime 1771 */ 1772 if (error == 0) { 1773 uint64_t mtime; 1774 1775 /*hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);*/ 1776 hammer2_update_time(&mtime); 1777 hammer2_inode_modify(dip); 1778 dip->meta.mtime = mtime; 1779 /*hammer2_inode_unlock(dip);*/ 1780 } 1781 hammer2_inode_unlock(dip); 1782 1783 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 1784 1785 if (error == 0) { 1786 cache_setunresolved(ap->a_nch); 1787 cache_setvp(ap->a_nch, *ap->a_vpp); 1788 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1789 } 1790 return error; 1791 } 1792 1793 /* 1794 * hammer2_vop_nsymlink { nch, dvp, vpp, cred, vap, target } 1795 */ 1796 static 1797 int 1798 hammer2_vop_nsymlink(struct vop_nsymlink_args *ap) 1799 { 1800 hammer2_inode_t *dip; 1801 hammer2_inode_t *nip; 1802 struct namecache *ncp; 1803 const char *name; 1804 size_t name_len; 1805 hammer2_tid_t inum; 1806 int error; 1807 1808 dip = VTOI(ap->a_dvp); 1809 if (dip->pmp->ronly || (dip->pmp->flags & HAMMER2_PMPF_EMERG)) 1810 return (EROFS); 1811 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1812 return (ENOSPC); 1813 1814 ncp = ap->a_nch->ncp; 1815 name = ncp->nc_name; 1816 name_len = ncp->nc_nlen; 1817 hammer2_trans_init(dip->pmp, 0); 1818 1819 ap->a_vap->va_type = VLNK; /* enforce type */ 1820 1821 /* 1822 * Create the softlink as an inode and then create the directory 1823 * entry. 1824 * 1825 * dip must be locked before nip to avoid deadlock. 1826 */ 1827 inum = hammer2_trans_newinum(dip->pmp); 1828 1829 hammer2_inode_lock(dip, 0); 1830 nip = hammer2_inode_create_normal(dip, ap->a_vap, ap->a_cred, 1831 inum, &error); 1832 if (error == 0) { 1833 error = hammer2_dirent_create(dip, name, name_len, 1834 nip->meta.inum, nip->meta.type); 1835 } 1836 if (error) { 1837 if (nip) { 1838 hammer2_inode_unlink_finisher(nip, NULL); 1839 hammer2_inode_unlock(nip); 1840 nip = NULL; 1841 } 1842 *ap->a_vpp = NULL; 1843 hammer2_inode_unlock(dip); 1844 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 1845 return error; 1846 } 1847 hammer2_inode_depend(dip, nip); /* before igetv */ 1848 *ap->a_vpp = hammer2_igetv(nip, &error); 1849 1850 /* 1851 * Build the softlink (~like file data) and finalize the namecache. 1852 */ 1853 if (error == 0) { 1854 size_t bytes; 1855 struct uio auio; 1856 struct iovec aiov; 1857 1858 bytes = strlen(ap->a_target); 1859 1860 hammer2_inode_unlock(nip); 1861 bzero(&auio, sizeof(auio)); 1862 bzero(&aiov, sizeof(aiov)); 1863 auio.uio_iov = &aiov; 1864 auio.uio_segflg = UIO_SYSSPACE; 1865 auio.uio_rw = UIO_WRITE; 1866 auio.uio_resid = bytes; 1867 auio.uio_iovcnt = 1; 1868 auio.uio_td = curthread; 1869 aiov.iov_base = ap->a_target; 1870 aiov.iov_len = bytes; 1871 error = hammer2_write_file(nip, &auio, IO_APPEND, 0); 1872 /* XXX handle error */ 1873 error = 0; 1874 } else { 1875 hammer2_inode_unlock(nip); 1876 } 1877 1878 /* 1879 * Update dip's mtime 1880 */ 1881 if (error == 0) { 1882 uint64_t mtime; 1883 1884 /*hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);*/ 1885 hammer2_update_time(&mtime); 1886 hammer2_inode_modify(dip); 1887 dip->meta.mtime = mtime; 1888 /*hammer2_inode_unlock(dip);*/ 1889 } 1890 hammer2_inode_unlock(dip); 1891 1892 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 1893 1894 /* 1895 * Finalize namecache 1896 */ 1897 if (error == 0) { 1898 cache_setunresolved(ap->a_nch); 1899 cache_setvp(ap->a_nch, *ap->a_vpp); 1900 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1901 } 1902 return error; 1903 } 1904 1905 /* 1906 * hammer2_vop_nremove { nch, dvp, cred } 1907 */ 1908 static 1909 int 1910 hammer2_vop_nremove(struct vop_nremove_args *ap) 1911 { 1912 hammer2_xop_unlink_t *xop; 1913 hammer2_inode_t *dip; 1914 hammer2_inode_t *ip; 1915 struct vnode *vprecycle; 1916 struct namecache *ncp; 1917 int error; 1918 1919 dip = VTOI(ap->a_dvp); 1920 if (dip->pmp->ronly) 1921 return (EROFS); 1922 #if 0 1923 /* allow removals, except user to also bulkfree */ 1924 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1925 return (ENOSPC); 1926 #endif 1927 1928 ncp = ap->a_nch->ncp; 1929 1930 if (hammer2_debug_inode && dip->meta.inum == hammer2_debug_inode) { 1931 kprintf("hammer2: attempt to delete inside debug inode: %s\n", 1932 ncp->nc_name); 1933 while (hammer2_debug_inode && 1934 dip->meta.inum == hammer2_debug_inode) { 1935 tsleep(&hammer2_debug_inode, 0, "h2debug", hz*5); 1936 } 1937 } 1938 1939 hammer2_trans_init(dip->pmp, 0); 1940 hammer2_inode_lock(dip, 0); 1941 1942 /* 1943 * The unlink XOP unlinks the path from the directory and 1944 * locates and returns the cluster associated with the real inode. 1945 * We have to handle nlinks here on the frontend. 1946 */ 1947 xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING); 1948 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen); 1949 1950 xop->isdir = 0; 1951 xop->dopermanent = 0; 1952 hammer2_xop_start(&xop->head, &hammer2_unlink_desc); 1953 1954 /* 1955 * Collect the real inode and adjust nlinks, destroy the real 1956 * inode if nlinks transitions to 0 and it was the real inode 1957 * (else it has already been removed). 1958 */ 1959 error = hammer2_xop_collect(&xop->head, 0); 1960 error = hammer2_error_to_errno(error); 1961 vprecycle = NULL; 1962 1963 if (error == 0) { 1964 ip = hammer2_inode_get(dip->pmp, &xop->head, -1, -1); 1965 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1966 if (ip) { 1967 if (hammer2_debug_inode && 1968 ip->meta.inum == hammer2_debug_inode) { 1969 kprintf("hammer2: attempt to delete debug " 1970 "inode!\n"); 1971 while (hammer2_debug_inode && 1972 ip->meta.inum == hammer2_debug_inode) { 1973 tsleep(&hammer2_debug_inode, 0, 1974 "h2debug", hz*5); 1975 } 1976 } 1977 hammer2_inode_unlink_finisher(ip, &vprecycle); 1978 hammer2_inode_depend(dip, ip); /* after modified */ 1979 hammer2_inode_unlock(ip); 1980 } 1981 } else { 1982 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1983 } 1984 1985 /* 1986 * Update dip's mtime 1987 */ 1988 if (error == 0) { 1989 uint64_t mtime; 1990 1991 /*hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);*/ 1992 hammer2_update_time(&mtime); 1993 hammer2_inode_modify(dip); 1994 dip->meta.mtime = mtime; 1995 /*hammer2_inode_unlock(dip);*/ 1996 } 1997 hammer2_inode_unlock(dip); 1998 1999 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 2000 if (error == 0) { 2001 cache_unlink(ap->a_nch); 2002 hammer2_knote(ap->a_dvp, NOTE_WRITE); 2003 } 2004 if (vprecycle) 2005 hammer2_inode_vprecycle(vprecycle); 2006 2007 return (error); 2008 } 2009 2010 /* 2011 * hammer2_vop_nrmdir { nch, dvp, cred } 2012 */ 2013 static 2014 int 2015 hammer2_vop_nrmdir(struct vop_nrmdir_args *ap) 2016 { 2017 hammer2_xop_unlink_t *xop; 2018 hammer2_inode_t *dip; 2019 hammer2_inode_t *ip; 2020 struct namecache *ncp; 2021 struct vnode *vprecycle; 2022 int error; 2023 2024 dip = VTOI(ap->a_dvp); 2025 if (dip->pmp->ronly) 2026 return (EROFS); 2027 #if 0 2028 /* allow removals, except user to also bulkfree */ 2029 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 2030 return (ENOSPC); 2031 #endif 2032 2033 hammer2_trans_init(dip->pmp, 0); 2034 hammer2_inode_lock(dip, 0); 2035 2036 xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING); 2037 2038 ncp = ap->a_nch->ncp; 2039 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen); 2040 xop->isdir = 1; 2041 xop->dopermanent = 0; 2042 hammer2_xop_start(&xop->head, &hammer2_unlink_desc); 2043 2044 /* 2045 * Collect the real inode and adjust nlinks, destroy the real 2046 * inode if nlinks transitions to 0 and it was the real inode 2047 * (else it has already been removed). 2048 */ 2049 error = hammer2_xop_collect(&xop->head, 0); 2050 error = hammer2_error_to_errno(error); 2051 vprecycle = NULL; 2052 2053 if (error == 0) { 2054 ip = hammer2_inode_get(dip->pmp, &xop->head, -1, -1); 2055 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 2056 if (ip) { 2057 hammer2_inode_unlink_finisher(ip, &vprecycle); 2058 hammer2_inode_depend(dip, ip); /* after modified */ 2059 hammer2_inode_unlock(ip); 2060 } 2061 } else { 2062 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 2063 } 2064 2065 /* 2066 * Update dip's mtime 2067 */ 2068 if (error == 0) { 2069 uint64_t mtime; 2070 2071 /*hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);*/ 2072 hammer2_update_time(&mtime); 2073 hammer2_inode_modify(dip); 2074 dip->meta.mtime = mtime; 2075 /*hammer2_inode_unlock(dip);*/ 2076 } 2077 hammer2_inode_unlock(dip); 2078 2079 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 2080 if (error == 0) { 2081 cache_unlink(ap->a_nch); 2082 hammer2_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 2083 } 2084 if (vprecycle) 2085 hammer2_inode_vprecycle(vprecycle); 2086 return (error); 2087 } 2088 2089 /* 2090 * hammer2_vop_nrename { fnch, tnch, fdvp, tdvp, cred } 2091 */ 2092 static 2093 int 2094 hammer2_vop_nrename(struct vop_nrename_args *ap) 2095 { 2096 struct namecache *fncp; 2097 struct namecache *tncp; 2098 hammer2_inode_t *fdip; /* source directory */ 2099 hammer2_inode_t *tdip; /* target directory */ 2100 hammer2_inode_t *ip; /* file being renamed */ 2101 hammer2_inode_t *tip; /* replaced target during rename or NULL */ 2102 struct vnode *vprecycle; 2103 const char *fname; 2104 size_t fname_len; 2105 const char *tname; 2106 size_t tname_len; 2107 int error; 2108 int update_tdip; 2109 int update_fdip; 2110 hammer2_key_t tlhc; 2111 2112 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount) 2113 return(EXDEV); 2114 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount) 2115 return(EXDEV); 2116 2117 fdip = VTOI(ap->a_fdvp); /* source directory */ 2118 tdip = VTOI(ap->a_tdvp); /* target directory */ 2119 2120 if (fdip->pmp->ronly || (fdip->pmp->flags & HAMMER2_PMPF_EMERG)) 2121 return (EROFS); 2122 if (hammer2_vfs_enospace(fdip, 0, ap->a_cred) > 1) 2123 return (ENOSPC); 2124 2125 fncp = ap->a_fnch->ncp; /* entry name in source */ 2126 fname = fncp->nc_name; 2127 fname_len = fncp->nc_nlen; 2128 2129 tncp = ap->a_tnch->ncp; /* entry name in target */ 2130 tname = tncp->nc_name; 2131 tname_len = tncp->nc_nlen; 2132 2133 hammer2_trans_init(tdip->pmp, 0); 2134 2135 update_tdip = 0; 2136 update_fdip = 0; 2137 2138 ip = VTOI(fncp->nc_vp); 2139 hammer2_inode_ref(ip); /* extra ref */ 2140 2141 /* 2142 * Lookup the target name to determine if a directory entry 2143 * is being overwritten. We only hold related inode locks 2144 * temporarily, the operating system is expected to protect 2145 * against rename races. 2146 */ 2147 tip = tncp->nc_vp ? VTOI(tncp->nc_vp) : NULL; 2148 if (tip) 2149 hammer2_inode_ref(tip); /* extra ref */ 2150 2151 /* 2152 * Can return NULL and error == EXDEV if the common parent 2153 * crosses a directory with the xlink flag set. 2154 * 2155 * For now try to avoid deadlocks with a simple pointer address 2156 * test. (tip) can be NULL. 2157 */ 2158 error = 0; 2159 { 2160 hammer2_inode_t *ip1 = fdip; 2161 hammer2_inode_t *ip2 = tdip; 2162 hammer2_inode_t *ip3 = ip; 2163 hammer2_inode_t *ip4 = tip; /* may be NULL */ 2164 2165 if (fdip > tdip) { 2166 ip1 = tdip; 2167 ip2 = fdip; 2168 } 2169 if (tip && ip > tip) { 2170 ip3 = tip; 2171 ip4 = ip; 2172 } 2173 hammer2_inode_lock4(ip1, ip2, ip3, ip4); 2174 } 2175 2176 /* 2177 * Resolve the collision space for (tdip, tname, tname_len) 2178 * 2179 * tdip must be held exclusively locked to prevent races since 2180 * multiple filenames can end up in the same collision space. 2181 */ 2182 { 2183 hammer2_xop_scanlhc_t *sxop; 2184 hammer2_tid_t lhcbase; 2185 2186 tlhc = hammer2_dirhash(tname, tname_len); 2187 lhcbase = tlhc; 2188 sxop = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING); 2189 sxop->lhc = tlhc; 2190 hammer2_xop_start(&sxop->head, &hammer2_scanlhc_desc); 2191 while ((error = hammer2_xop_collect(&sxop->head, 0)) == 0) { 2192 if (tlhc != sxop->head.cluster.focus->bref.key) 2193 break; 2194 ++tlhc; 2195 } 2196 error = hammer2_error_to_errno(error); 2197 hammer2_xop_retire(&sxop->head, HAMMER2_XOPMASK_VOP); 2198 2199 if (error) { 2200 if (error != ENOENT) 2201 goto done2; 2202 ++tlhc; 2203 error = 0; 2204 } 2205 if ((lhcbase ^ tlhc) & ~HAMMER2_DIRHASH_LOMASK) { 2206 error = ENOSPC; 2207 goto done2; 2208 } 2209 } 2210 2211 /* 2212 * Ready to go, issue the rename to the backend. Note that meta-data 2213 * updates to the related inodes occur separately from the rename 2214 * operation. 2215 * 2216 * NOTE: While it is not necessary to update ip->meta.name*, doing 2217 * so aids catastrophic recovery and debugging. 2218 */ 2219 if (error == 0) { 2220 hammer2_xop_nrename_t *xop4; 2221 2222 xop4 = hammer2_xop_alloc(fdip, HAMMER2_XOP_MODIFYING); 2223 xop4->lhc = tlhc; 2224 xop4->ip_key = ip->meta.name_key; 2225 hammer2_xop_setip2(&xop4->head, ip); 2226 hammer2_xop_setip3(&xop4->head, tdip); 2227 if (tip && tip->meta.type == HAMMER2_OBJTYPE_DIRECTORY) 2228 hammer2_xop_setip4(&xop4->head, tip); 2229 hammer2_xop_setname(&xop4->head, fname, fname_len); 2230 hammer2_xop_setname2(&xop4->head, tname, tname_len); 2231 hammer2_xop_start(&xop4->head, &hammer2_nrename_desc); 2232 2233 error = hammer2_xop_collect(&xop4->head, 0); 2234 error = hammer2_error_to_errno(error); 2235 hammer2_xop_retire(&xop4->head, HAMMER2_XOPMASK_VOP); 2236 2237 if (error == ENOENT) 2238 error = 0; 2239 2240 /* 2241 * Update inode meta-data. 2242 * 2243 * WARNING! The in-memory inode (ip) structure does not 2244 * maintain a copy of the inode's filename buffer. 2245 */ 2246 if (error == 0 && 2247 (ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE)) { 2248 hammer2_inode_modify(ip); 2249 ip->meta.name_len = tname_len; 2250 ip->meta.name_key = tlhc; 2251 } 2252 if (error == 0) { 2253 hammer2_inode_modify(ip); 2254 ip->meta.iparent = tdip->meta.inum; 2255 } 2256 update_fdip = 1; 2257 update_tdip = 1; 2258 } 2259 2260 done2: 2261 /* 2262 * If no error, the backend has replaced the target directory entry. 2263 * We must adjust nlinks on the original replace target if it exists. 2264 */ 2265 vprecycle = NULL; 2266 if (error == 0 && tip) { 2267 hammer2_inode_unlink_finisher(tip, &vprecycle); 2268 } 2269 2270 /* 2271 * Update directory mtimes to represent the something changed. 2272 */ 2273 if (update_fdip || update_tdip) { 2274 uint64_t mtime; 2275 2276 hammer2_update_time(&mtime); 2277 if (update_fdip) { 2278 hammer2_inode_modify(fdip); 2279 fdip->meta.mtime = mtime; 2280 } 2281 if (update_tdip) { 2282 hammer2_inode_modify(tdip); 2283 tdip->meta.mtime = mtime; 2284 } 2285 } 2286 if (tip) { 2287 hammer2_inode_unlock(tip); 2288 hammer2_inode_drop(tip); 2289 } 2290 hammer2_inode_unlock(ip); 2291 hammer2_inode_unlock(tdip); 2292 hammer2_inode_unlock(fdip); 2293 hammer2_inode_drop(ip); 2294 hammer2_trans_done(tdip->pmp, HAMMER2_TRANS_SIDEQ); 2295 2296 /* 2297 * Issue the namecache update after unlocking all the internal 2298 * hammer2 structures, otherwise we might deadlock. 2299 * 2300 * WARNING! The target namespace must be updated atomically, 2301 * and we depend on cache_rename() to handle that for 2302 * us. Do not do a separate cache_unlink() because 2303 * that leaves a small window of opportunity for other 2304 * threads to allocate the target namespace before we 2305 * manage to complete our rename. 2306 * 2307 * WARNING! cache_rename() (and cache_unlink()) will properly 2308 * set VREF_FINALIZE on any attached vnode. Do not 2309 * call cache_setunresolved() manually before-hand as 2310 * this will prevent the flag from being set later via 2311 * cache_rename(). If VREF_FINALIZE is not properly set 2312 * and the inode is no longer in the topology, related 2313 * chains can remain dirty indefinitely. 2314 */ 2315 if (error == 0 && tip) { 2316 /*cache_unlink(ap->a_tnch); see above */ 2317 /*cache_setunresolved(ap->a_tnch); see above */ 2318 } 2319 if (error == 0) { 2320 cache_rename(ap->a_fnch, ap->a_tnch); 2321 hammer2_knote(ap->a_fdvp, NOTE_WRITE); 2322 hammer2_knote(ap->a_tdvp, NOTE_WRITE); 2323 hammer2_knote(fncp->nc_vp, NOTE_RENAME); 2324 } 2325 if (vprecycle) 2326 hammer2_inode_vprecycle(vprecycle); 2327 2328 return (error); 2329 } 2330 2331 /* 2332 * hammer2_vop_ioctl { vp, command, data, fflag, cred } 2333 */ 2334 static 2335 int 2336 hammer2_vop_ioctl(struct vop_ioctl_args *ap) 2337 { 2338 hammer2_inode_t *ip; 2339 int error; 2340 2341 ip = VTOI(ap->a_vp); 2342 2343 error = hammer2_ioctl(ip, ap->a_command, (void *)ap->a_data, 2344 ap->a_fflag, ap->a_cred); 2345 return (error); 2346 } 2347 2348 static 2349 int 2350 hammer2_vop_mountctl(struct vop_mountctl_args *ap) 2351 { 2352 struct mount *mp; 2353 hammer2_pfs_t *pmp; 2354 int rc; 2355 2356 switch (ap->a_op) { 2357 case (MOUNTCTL_SET_EXPORT): 2358 mp = ap->a_head.a_ops->head.vv_mount; 2359 pmp = MPTOPMP(mp); 2360 2361 if (ap->a_ctllen != sizeof(struct export_args)) 2362 rc = (EINVAL); 2363 else 2364 rc = vfs_export(mp, &pmp->export, 2365 (const struct export_args *)ap->a_ctl); 2366 break; 2367 default: 2368 rc = vop_stdmountctl(ap); 2369 break; 2370 } 2371 return (rc); 2372 } 2373 2374 /* 2375 * KQFILTER 2376 */ 2377 static void filt_hammer2detach(struct knote *kn); 2378 static int filt_hammer2read(struct knote *kn, long hint); 2379 static int filt_hammer2write(struct knote *kn, long hint); 2380 static int filt_hammer2vnode(struct knote *kn, long hint); 2381 2382 static struct filterops hammer2read_filtops = 2383 { FILTEROP_ISFD | FILTEROP_MPSAFE, 2384 NULL, filt_hammer2detach, filt_hammer2read }; 2385 static struct filterops hammer2write_filtops = 2386 { FILTEROP_ISFD | FILTEROP_MPSAFE, 2387 NULL, filt_hammer2detach, filt_hammer2write }; 2388 static struct filterops hammer2vnode_filtops = 2389 { FILTEROP_ISFD | FILTEROP_MPSAFE, 2390 NULL, filt_hammer2detach, filt_hammer2vnode }; 2391 2392 static 2393 int 2394 hammer2_vop_kqfilter(struct vop_kqfilter_args *ap) 2395 { 2396 struct vnode *vp = ap->a_vp; 2397 struct knote *kn = ap->a_kn; 2398 2399 switch (kn->kn_filter) { 2400 case EVFILT_READ: 2401 kn->kn_fop = &hammer2read_filtops; 2402 break; 2403 case EVFILT_WRITE: 2404 kn->kn_fop = &hammer2write_filtops; 2405 break; 2406 case EVFILT_VNODE: 2407 kn->kn_fop = &hammer2vnode_filtops; 2408 break; 2409 default: 2410 return (EOPNOTSUPP); 2411 } 2412 2413 kn->kn_hook = (caddr_t)vp; 2414 2415 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 2416 2417 return(0); 2418 } 2419 2420 static void 2421 filt_hammer2detach(struct knote *kn) 2422 { 2423 struct vnode *vp = (void *)kn->kn_hook; 2424 2425 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 2426 } 2427 2428 static int 2429 filt_hammer2read(struct knote *kn, long hint) 2430 { 2431 struct vnode *vp = (void *)kn->kn_hook; 2432 hammer2_inode_t *ip = VTOI(vp); 2433 off_t off; 2434 2435 if (hint == NOTE_REVOKE) { 2436 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 2437 return(1); 2438 } 2439 off = ip->meta.size - kn->kn_fp->f_offset; 2440 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 2441 if (kn->kn_sfflags & NOTE_OLDAPI) 2442 return(1); 2443 return (kn->kn_data != 0); 2444 } 2445 2446 2447 static int 2448 filt_hammer2write(struct knote *kn, long hint) 2449 { 2450 if (hint == NOTE_REVOKE) 2451 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 2452 kn->kn_data = 0; 2453 return (1); 2454 } 2455 2456 static int 2457 filt_hammer2vnode(struct knote *kn, long hint) 2458 { 2459 if (kn->kn_sfflags & hint) 2460 kn->kn_fflags |= hint; 2461 if (hint == NOTE_REVOKE) { 2462 kn->kn_flags |= (EV_EOF | EV_NODATA); 2463 return (1); 2464 } 2465 return (kn->kn_fflags != 0); 2466 } 2467 2468 /* 2469 * FIFO VOPS 2470 */ 2471 static 2472 int 2473 hammer2_vop_markatime(struct vop_markatime_args *ap) 2474 { 2475 hammer2_inode_t *ip; 2476 struct vnode *vp; 2477 2478 vp = ap->a_vp; 2479 ip = VTOI(vp); 2480 2481 if (ip->pmp->ronly || (ip->pmp->flags & HAMMER2_PMPF_EMERG)) 2482 return (EROFS); 2483 return(0); 2484 } 2485 2486 static 2487 int 2488 hammer2_vop_fifokqfilter(struct vop_kqfilter_args *ap) 2489 { 2490 int error; 2491 2492 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 2493 if (error) 2494 error = hammer2_vop_kqfilter(ap); 2495 return(error); 2496 } 2497 2498 /* 2499 * VOPS vector 2500 */ 2501 struct vop_ops hammer2_vnode_vops = { 2502 .vop_default = vop_defaultop, 2503 .vop_fsync = hammer2_vop_fsync, 2504 .vop_getpages = vop_stdgetpages, 2505 .vop_putpages = vop_stdputpages, 2506 .vop_access = hammer2_vop_access, 2507 .vop_advlock = hammer2_vop_advlock, 2508 .vop_close = hammer2_vop_close, 2509 .vop_nlink = hammer2_vop_nlink, 2510 .vop_ncreate = hammer2_vop_ncreate, 2511 .vop_nsymlink = hammer2_vop_nsymlink, 2512 .vop_nremove = hammer2_vop_nremove, 2513 .vop_nrmdir = hammer2_vop_nrmdir, 2514 .vop_nrename = hammer2_vop_nrename, 2515 .vop_getattr = hammer2_vop_getattr, 2516 .vop_getattr_lite = hammer2_vop_getattr_lite, 2517 .vop_setattr = hammer2_vop_setattr, 2518 .vop_readdir = hammer2_vop_readdir, 2519 .vop_readlink = hammer2_vop_readlink, 2520 .vop_read = hammer2_vop_read, 2521 .vop_write = hammer2_vop_write, 2522 .vop_open = hammer2_vop_open, 2523 .vop_inactive = hammer2_vop_inactive, 2524 .vop_reclaim = hammer2_vop_reclaim, 2525 .vop_nresolve = hammer2_vop_nresolve, 2526 .vop_nlookupdotdot = hammer2_vop_nlookupdotdot, 2527 .vop_nmkdir = hammer2_vop_nmkdir, 2528 .vop_nmknod = hammer2_vop_nmknod, 2529 .vop_ioctl = hammer2_vop_ioctl, 2530 .vop_mountctl = hammer2_vop_mountctl, 2531 .vop_bmap = hammer2_vop_bmap, 2532 .vop_strategy = hammer2_vop_strategy, 2533 .vop_kqfilter = hammer2_vop_kqfilter 2534 }; 2535 2536 struct vop_ops hammer2_spec_vops = { 2537 .vop_default = vop_defaultop, 2538 .vop_fsync = hammer2_vop_fsync, 2539 .vop_read = vop_stdnoread, 2540 .vop_write = vop_stdnowrite, 2541 .vop_access = hammer2_vop_access, 2542 .vop_close = hammer2_vop_close, 2543 .vop_markatime = hammer2_vop_markatime, 2544 .vop_getattr = hammer2_vop_getattr, 2545 .vop_inactive = hammer2_vop_inactive, 2546 .vop_reclaim = hammer2_vop_reclaim, 2547 .vop_setattr = hammer2_vop_setattr 2548 }; 2549 2550 struct vop_ops hammer2_fifo_vops = { 2551 .vop_default = fifo_vnoperate, 2552 .vop_fsync = hammer2_vop_fsync, 2553 #if 0 2554 .vop_read = hammer2_vop_fiforead, 2555 .vop_write = hammer2_vop_fifowrite, 2556 #endif 2557 .vop_access = hammer2_vop_access, 2558 #if 0 2559 .vop_close = hammer2_vop_fifoclose, 2560 #endif 2561 .vop_markatime = hammer2_vop_markatime, 2562 .vop_getattr = hammer2_vop_getattr, 2563 .vop_inactive = hammer2_vop_inactive, 2564 .vop_reclaim = hammer2_vop_reclaim, 2565 .vop_setattr = hammer2_vop_setattr, 2566 .vop_kqfilter = hammer2_vop_fifokqfilter 2567 }; 2568 2569