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 struct objcache *cache_xops; 69 70 static __inline 71 void 72 hammer2_knote(struct vnode *vp, int flags) 73 { 74 if (flags) 75 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags); 76 } 77 78 /* 79 * Last reference to a vnode is going away but it is still cached. 80 */ 81 static 82 int 83 hammer2_vop_inactive(struct vop_inactive_args *ap) 84 { 85 hammer2_inode_t *ip; 86 struct vnode *vp; 87 88 vp = ap->a_vp; 89 ip = VTOI(vp); 90 91 /* 92 * Degenerate case 93 */ 94 if (ip == NULL) { 95 vrecycle(vp); 96 return (0); 97 } 98 99 /* 100 * Check for deleted inodes and recycle immediately on the last 101 * release. Be sure to destroy any left-over buffer cache buffers 102 * so we do not waste time trying to flush them. 103 * 104 * Note that deleting the file block chains under the inode chain 105 * would just be a waste of energy, so don't do it. 106 * 107 * WARNING: nvtruncbuf() can only be safely called without the inode 108 * lock held due to the way our write thread works. 109 */ 110 if (ip->flags & HAMMER2_INODE_ISUNLINKED) { 111 hammer2_key_t lbase; 112 int nblksize; 113 114 /* 115 * Detect updates to the embedded data which may be 116 * synchronized by the strategy code. Simply mark the 117 * inode modified so it gets picked up by our normal flush. 118 */ 119 nblksize = hammer2_calc_logical(ip, 0, &lbase, NULL); 120 nvtruncbuf(vp, 0, nblksize, 0, 0); 121 vrecycle(vp); 122 } 123 return (0); 124 } 125 126 /* 127 * Reclaim a vnode so that it can be reused; after the inode is 128 * disassociated, the filesystem must manage it alone. 129 */ 130 static 131 int 132 hammer2_vop_reclaim(struct vop_reclaim_args *ap) 133 { 134 hammer2_inode_t *ip; 135 hammer2_pfs_t *pmp; 136 struct vnode *vp; 137 138 vp = ap->a_vp; 139 ip = VTOI(vp); 140 if (ip == NULL) { 141 return(0); 142 } 143 pmp = ip->pmp; 144 145 /* 146 * The final close of a deleted file or directory marks it for 147 * destruction. The DELETED flag allows the flusher to shortcut 148 * any modified blocks still unflushed (that is, just ignore them). 149 * 150 * HAMMER2 usually does not try to optimize the freemap by returning 151 * deleted blocks to it as it does not usually know how many snapshots 152 * might be referencing portions of the file/dir. 153 */ 154 vp->v_data = NULL; 155 ip->vp = NULL; 156 157 /* 158 * NOTE! We do not attempt to flush chains here, flushing is 159 * really fragile and could also deadlock. 160 */ 161 vclrisdirty(vp); 162 163 /* 164 * Modified inodes will already be on SIDEQ or SYNCQ. However, 165 * unlinked-but-open inodes may already have been synced and might 166 * still require deletion-on-reclaim. 167 */ 168 if ((ip->flags & (HAMMER2_INODE_ISUNLINKED | 169 HAMMER2_INODE_DELETING)) == 170 HAMMER2_INODE_ISUNLINKED) { 171 hammer2_inode_lock(ip, 0); 172 if ((ip->flags & (HAMMER2_INODE_ISUNLINKED | 173 HAMMER2_INODE_DELETING)) == 174 HAMMER2_INODE_ISUNLINKED) { 175 atomic_set_int(&ip->flags, HAMMER2_INODE_DELETING); 176 hammer2_inode_delayed_sideq(ip); 177 } 178 hammer2_inode_unlock(ip); 179 } 180 181 /* 182 * Modified inodes will already be on SIDEQ or SYNCQ, no further 183 * action is needed. 184 * 185 * We cannot safely synchronize the inode from inside the reclaim 186 * due to potentially deep locks held as-of when the reclaim occurs. 187 * Interactions and potential deadlocks abound. We also can't do it 188 * here without desynchronizing from the related directory entrie(s). 189 */ 190 hammer2_inode_drop(ip); /* vp ref */ 191 192 /* 193 * XXX handle background sync when ip dirty, kernel will no longer 194 * notify us regarding this inode because there is no longer a 195 * vnode attached to it. 196 */ 197 198 return (0); 199 } 200 201 /* 202 * Currently this function synchronizes the front-end inode state to the 203 * backend chain topology, then flushes the inode's chain and sub-topology 204 * to backend media. This function does not flush the root topology down to 205 * the inode. 206 */ 207 static 208 int 209 hammer2_vop_fsync(struct vop_fsync_args *ap) 210 { 211 hammer2_inode_t *ip; 212 struct vnode *vp; 213 int error1; 214 int error2; 215 216 vp = ap->a_vp; 217 ip = VTOI(vp); 218 error1 = 0; 219 220 hammer2_trans_init(ip->pmp, 0); 221 222 /* 223 * Flush dirty buffers in the file's logical buffer cache. 224 * It is best to wait for the strategy code to commit the 225 * buffers to the device's backing buffer cache before 226 * then trying to flush the inode. 227 * 228 * This should be quick, but certain inode modifications cached 229 * entirely in the hammer2_inode structure may not trigger a 230 * buffer read until the flush so the fsync can wind up also 231 * doing scattered reads. 232 */ 233 vfsync(vp, ap->a_waitfor, 1, NULL, NULL); 234 bio_track_wait(&vp->v_track_write, 0, 0); 235 236 /* 237 * Flush any inode changes 238 */ 239 hammer2_inode_lock(ip, 0); 240 if (ip->flags & (HAMMER2_INODE_RESIZED|HAMMER2_INODE_MODIFIED)) 241 error1 = hammer2_inode_chain_sync(ip); 242 243 /* 244 * Flush dirty chains related to the inode. 245 * 246 * NOTE! We are not in a flush transaction. The inode remains on 247 * the sideq so the filesystem syncer can synchronize it to 248 * the volume root. 249 */ 250 error2 = hammer2_inode_chain_flush(ip, HAMMER2_XOP_INODE_STOP); 251 if (error2) 252 error1 = error2; 253 254 /* 255 * We may be able to clear the vnode dirty flag. The 256 * hammer2_pfs_moderate() code depends on this usually working. 257 */ 258 if ((ip->flags & (HAMMER2_INODE_MODIFIED | 259 HAMMER2_INODE_RESIZED | 260 HAMMER2_INODE_DIRTYDATA)) == 0 && 261 RB_EMPTY(&vp->v_rbdirty_tree) && 262 !bio_track_active(&vp->v_track_write)) { 263 vclrisdirty(vp); 264 } 265 hammer2_inode_unlock(ip); 266 hammer2_trans_done(ip->pmp, 0); 267 268 return (error1); 269 } 270 271 /* 272 * No lock needed, just handle ip->update 273 */ 274 static 275 int 276 hammer2_vop_access(struct vop_access_args *ap) 277 { 278 hammer2_inode_t *ip = VTOI(ap->a_vp); 279 uid_t uid; 280 gid_t gid; 281 mode_t mode; 282 uint32_t uflags; 283 int error; 284 int update; 285 286 retry: 287 update = spin_access_start(&ip->cluster_spin); 288 289 /*hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);*/ 290 uid = hammer2_to_unix_xid(&ip->meta.uid); 291 gid = hammer2_to_unix_xid(&ip->meta.gid); 292 mode = ip->meta.mode; 293 uflags = ip->meta.uflags; 294 /*hammer2_inode_unlock(ip);*/ 295 296 if (__predict_false(spin_access_end(&ip->cluster_spin, update))) 297 goto retry; 298 299 error = vop_helper_access(ap, uid, gid, mode, uflags); 300 301 return (error); 302 } 303 304 static 305 int 306 hammer2_vop_getattr(struct vop_getattr_args *ap) 307 { 308 hammer2_pfs_t *pmp; 309 hammer2_inode_t *ip; 310 struct vnode *vp; 311 struct vattr *vap; 312 hammer2_chain_t *chain; 313 int update; 314 int i; 315 316 vp = ap->a_vp; 317 vap = ap->a_vap; 318 319 ip = VTOI(vp); 320 pmp = ip->pmp; 321 322 retry: 323 update = spin_access_start(&ip->cluster_spin); 324 325 vap->va_fsid = pmp->mp->mnt_stat.f_fsid.val[0]; 326 vap->va_fileid = ip->meta.inum; 327 vap->va_mode = ip->meta.mode; 328 vap->va_nlink = ip->meta.nlinks; 329 vap->va_uid = hammer2_to_unix_xid(&ip->meta.uid); 330 vap->va_gid = hammer2_to_unix_xid(&ip->meta.gid); 331 vap->va_rmajor = 0; 332 vap->va_rminor = 0; 333 vap->va_size = ip->meta.size; /* protected by shared lock */ 334 vap->va_blocksize = HAMMER2_PBUFSIZE; 335 vap->va_flags = ip->meta.uflags; 336 hammer2_time_to_timespec(ip->meta.ctime, &vap->va_ctime); 337 hammer2_time_to_timespec(ip->meta.mtime, &vap->va_mtime); 338 hammer2_time_to_timespec(ip->meta.mtime, &vap->va_atime); 339 vap->va_gen = 1; 340 vap->va_bytes = 0; 341 if (ip->meta.type == HAMMER2_OBJTYPE_DIRECTORY) { 342 /* 343 * Can't really calculate directory use sans the files under 344 * it, just assume one block for now. 345 */ 346 vap->va_bytes += HAMMER2_INODE_BYTES; 347 } else { 348 for (i = 0; i < ip->cluster.nchains; ++i) { 349 if ((chain = ip->cluster.array[i].chain) != NULL) { 350 if (vap->va_bytes < 351 chain->bref.embed.stats.data_count) { 352 vap->va_bytes = 353 chain->bref.embed.stats.data_count; 354 } 355 } 356 } 357 } 358 vap->va_type = hammer2_get_vtype(ip->meta.type); 359 vap->va_filerev = 0; 360 vap->va_uid_uuid = ip->meta.uid; 361 vap->va_gid_uuid = ip->meta.gid; 362 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID | 363 VA_FSID_UUID_VALID; 364 365 if (__predict_false(spin_access_end(&ip->cluster_spin, update))) 366 goto retry; 367 368 return (0); 369 } 370 371 static 372 int 373 hammer2_vop_getattr_lite(struct vop_getattr_lite_args *ap) 374 { 375 hammer2_pfs_t *pmp; 376 hammer2_inode_t *ip; 377 struct vnode *vp; 378 struct vattr_lite *lvap; 379 int update; 380 381 vp = ap->a_vp; 382 lvap = ap->a_lvap; 383 384 ip = VTOI(vp); 385 pmp = ip->pmp; 386 387 retry: 388 update = spin_access_start(&ip->cluster_spin); 389 390 #if 0 391 vap->va_fsid = pmp->mp->mnt_stat.f_fsid.val[0]; 392 vap->va_fileid = ip->meta.inum; 393 #endif 394 lvap->va_mode = ip->meta.mode; 395 lvap->va_nlink = ip->meta.nlinks; 396 lvap->va_uid = hammer2_to_unix_xid(&ip->meta.uid); 397 lvap->va_gid = hammer2_to_unix_xid(&ip->meta.gid); 398 #if 0 399 vap->va_rmajor = 0; 400 vap->va_rminor = 0; 401 #endif 402 lvap->va_size = ip->meta.size; 403 #if 0 404 vap->va_blocksize = HAMMER2_PBUFSIZE; 405 #endif 406 lvap->va_flags = ip->meta.uflags; 407 lvap->va_type = hammer2_get_vtype(ip->meta.type); 408 #if 0 409 vap->va_filerev = 0; 410 vap->va_uid_uuid = ip->meta.uid; 411 vap->va_gid_uuid = ip->meta.gid; 412 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID | 413 VA_FSID_UUID_VALID; 414 #endif 415 416 if (__predict_false(spin_access_end(&ip->cluster_spin, update))) 417 goto retry; 418 419 return (0); 420 } 421 422 static 423 int 424 hammer2_vop_setattr(struct vop_setattr_args *ap) 425 { 426 hammer2_inode_t *ip; 427 struct vnode *vp; 428 struct vattr *vap; 429 int error; 430 int kflags = 0; 431 uint64_t ctime; 432 433 vp = ap->a_vp; 434 vap = ap->a_vap; 435 hammer2_update_time(&ctime); 436 437 ip = VTOI(vp); 438 439 if (ip->pmp->ronly) 440 return (EROFS); 441 442 /* 443 * Normally disallow setattr if there is no space, unless we 444 * are in emergency mode (might be needed to chflags -R noschg 445 * files prior to removal). 446 */ 447 if ((ip->pmp->flags & HAMMER2_PMPF_EMERG) == 0 && 448 hammer2_vfs_enospace(ip, 0, ap->a_cred) > 1) { 449 return (ENOSPC); 450 } 451 452 hammer2_trans_init(ip->pmp, 0); 453 hammer2_inode_lock(ip, 0); 454 error = 0; 455 456 if (vap->va_flags != VNOVAL) { 457 uint32_t flags; 458 459 flags = ip->meta.uflags; 460 error = vop_helper_setattr_flags(&flags, vap->va_flags, 461 hammer2_to_unix_xid(&ip->meta.uid), 462 ap->a_cred); 463 if (error == 0) { 464 if (ip->meta.uflags != flags) { 465 hammer2_inode_modify(ip); 466 spin_lock_update(&ip->cluster_spin); 467 ip->meta.uflags = flags; 468 ip->meta.ctime = ctime; 469 spin_unlock_update(&ip->cluster_spin); 470 kflags |= NOTE_ATTRIB; 471 } 472 if (ip->meta.uflags & (IMMUTABLE | APPEND)) { 473 error = 0; 474 goto done; 475 } 476 } 477 goto done; 478 } 479 if (ip->meta.uflags & (IMMUTABLE | APPEND)) { 480 error = EPERM; 481 goto done; 482 } 483 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 484 mode_t cur_mode = ip->meta.mode; 485 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid); 486 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid); 487 uuid_t uuid_uid; 488 uuid_t uuid_gid; 489 490 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid, 491 ap->a_cred, 492 &cur_uid, &cur_gid, &cur_mode); 493 if (error == 0) { 494 hammer2_guid_to_uuid(&uuid_uid, cur_uid); 495 hammer2_guid_to_uuid(&uuid_gid, cur_gid); 496 if (bcmp(&uuid_uid, &ip->meta.uid, sizeof(uuid_uid)) || 497 bcmp(&uuid_gid, &ip->meta.gid, sizeof(uuid_gid)) || 498 ip->meta.mode != cur_mode 499 ) { 500 hammer2_inode_modify(ip); 501 spin_lock_update(&ip->cluster_spin); 502 ip->meta.uid = uuid_uid; 503 ip->meta.gid = uuid_gid; 504 ip->meta.mode = cur_mode; 505 ip->meta.ctime = ctime; 506 spin_unlock_update(&ip->cluster_spin); 507 } 508 kflags |= NOTE_ATTRIB; 509 } 510 } 511 512 /* 513 * Resize the file 514 */ 515 if (vap->va_size != VNOVAL && ip->meta.size != vap->va_size) { 516 switch(vp->v_type) { 517 case VREG: 518 if (vap->va_size == ip->meta.size) 519 break; 520 if (vap->va_size < ip->meta.size) { 521 hammer2_mtx_ex(&ip->truncate_lock); 522 hammer2_truncate_file(ip, vap->va_size); 523 hammer2_mtx_unlock(&ip->truncate_lock); 524 kflags |= NOTE_WRITE; 525 } else { 526 hammer2_extend_file(ip, vap->va_size); 527 kflags |= NOTE_WRITE | NOTE_EXTEND; 528 } 529 hammer2_inode_modify(ip); 530 ip->meta.mtime = ctime; 531 vclrflags(vp, VLASTWRITETS); 532 break; 533 default: 534 error = EINVAL; 535 goto done; 536 } 537 } 538 #if 0 539 /* atime not supported */ 540 if (vap->va_atime.tv_sec != VNOVAL) { 541 hammer2_inode_modify(ip); 542 ip->meta.atime = hammer2_timespec_to_time(&vap->va_atime); 543 kflags |= NOTE_ATTRIB; 544 } 545 #endif 546 if (vap->va_mode != (mode_t)VNOVAL) { 547 mode_t cur_mode = ip->meta.mode; 548 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid); 549 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid); 550 551 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred, 552 cur_uid, cur_gid, &cur_mode); 553 if (error == 0 && ip->meta.mode != cur_mode) { 554 hammer2_inode_modify(ip); 555 spin_lock_update(&ip->cluster_spin); 556 ip->meta.mode = cur_mode; 557 ip->meta.ctime = ctime; 558 spin_unlock_update(&ip->cluster_spin); 559 kflags |= NOTE_ATTRIB; 560 } 561 } 562 563 if (vap->va_mtime.tv_sec != VNOVAL) { 564 hammer2_inode_modify(ip); 565 ip->meta.mtime = hammer2_timespec_to_time(&vap->va_mtime); 566 kflags |= NOTE_ATTRIB; 567 vclrflags(vp, VLASTWRITETS); 568 } 569 570 done: 571 /* 572 * If a truncation occurred we must call chain_sync() now in order 573 * to trim the related data chains, otherwise a later expansion can 574 * cause havoc. 575 * 576 * If an extend occured that changed the DIRECTDATA state, we must 577 * call inode_chain_sync now in order to prepare the inode's indirect 578 * block table. 579 * 580 * WARNING! This means we are making an adjustment to the inode's 581 * chain outside of sync/fsync, and not just to inode->meta, which 582 * may result in some consistency issues if a crash were to occur 583 * at just the wrong time. 584 */ 585 if (ip->flags & HAMMER2_INODE_RESIZED) 586 hammer2_inode_chain_sync(ip); 587 588 /* 589 * Cleanup. 590 */ 591 hammer2_inode_unlock(ip); 592 hammer2_trans_done(ip->pmp, HAMMER2_TRANS_SIDEQ); 593 hammer2_knote(ip->vp, kflags); 594 595 return (error); 596 } 597 598 static 599 int 600 hammer2_vop_readdir(struct vop_readdir_args *ap) 601 { 602 hammer2_xop_readdir_t *xop; 603 hammer2_blockref_t bref; 604 hammer2_inode_t *ip; 605 hammer2_tid_t inum; 606 hammer2_key_t lkey; 607 struct uio *uio; 608 off_t *cookies; 609 off_t saveoff; 610 int cookie_index; 611 int ncookies; 612 int error; 613 int eofflag; 614 int r; 615 616 ip = VTOI(ap->a_vp); 617 uio = ap->a_uio; 618 saveoff = uio->uio_offset; 619 eofflag = 0; 620 error = 0; 621 622 /* 623 * Setup cookies directory entry cookies if requested 624 */ 625 if (ap->a_ncookies) { 626 ncookies = uio->uio_resid / 16 + 1; 627 if (ncookies > 1024) 628 ncookies = 1024; 629 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 630 } else { 631 ncookies = -1; 632 cookies = NULL; 633 } 634 cookie_index = 0; 635 636 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED); 637 638 /* 639 * Handle artificial entries. To ensure that only positive 64 bit 640 * quantities are returned to userland we always strip off bit 63. 641 * The hash code is designed such that codes 0x0000-0x7FFF are not 642 * used, allowing us to use these codes for articial entries. 643 * 644 * Entry 0 is used for '.' and entry 1 is used for '..'. Do not 645 * allow '..' to cross the mount point into (e.g.) the super-root. 646 */ 647 if (saveoff == 0) { 648 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK; 649 r = vop_write_dirent(&error, uio, inum, DT_DIR, 1, "."); 650 if (r) 651 goto done; 652 if (cookies) 653 cookies[cookie_index] = saveoff; 654 ++saveoff; 655 ++cookie_index; 656 if (cookie_index == ncookies) 657 goto done; 658 } 659 660 if (saveoff == 1) { 661 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK; 662 if (ip != ip->pmp->iroot) 663 inum = ip->meta.iparent & HAMMER2_DIRHASH_USERMSK; 664 r = vop_write_dirent(&error, uio, inum, DT_DIR, 2, ".."); 665 if (r) 666 goto done; 667 if (cookies) 668 cookies[cookie_index] = saveoff; 669 ++saveoff; 670 ++cookie_index; 671 if (cookie_index == ncookies) 672 goto done; 673 } 674 675 lkey = saveoff | HAMMER2_DIRHASH_VISIBLE; 676 if (hammer2_debug & 0x0020) 677 kprintf("readdir: lkey %016jx\n", lkey); 678 if (error) 679 goto done; 680 681 /* 682 * Use XOP for cluster scan. 683 * 684 * parent is the inode cluster, already locked for us. Don't 685 * double lock shared locks as this will screw up upgrades. 686 */ 687 xop = hammer2_xop_alloc(ip, 0); 688 xop->lkey = lkey; 689 hammer2_xop_start(&xop->head, &hammer2_readdir_desc); 690 691 for (;;) { 692 const hammer2_inode_data_t *ripdata; 693 const char *dname; 694 int dtype; 695 696 error = hammer2_xop_collect(&xop->head, 0); 697 error = hammer2_error_to_errno(error); 698 if (error) { 699 break; 700 } 701 if (cookie_index == ncookies) 702 break; 703 if (hammer2_debug & 0x0020) 704 kprintf("cluster chain %p %p\n", 705 xop->head.cluster.focus, 706 (xop->head.cluster.focus ? 707 xop->head.cluster.focus->data : (void *)-1)); 708 hammer2_cluster_bref(&xop->head.cluster, &bref); 709 710 if (bref.type == HAMMER2_BREF_TYPE_INODE) { 711 ripdata = &hammer2_xop_gdata(&xop->head)->ipdata; 712 dtype = hammer2_get_dtype(ripdata->meta.type); 713 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK; 714 r = vop_write_dirent(&error, uio, 715 ripdata->meta.inum & 716 HAMMER2_DIRHASH_USERMSK, 717 dtype, 718 ripdata->meta.name_len, 719 ripdata->filename); 720 hammer2_xop_pdata(&xop->head); 721 if (r) 722 break; 723 if (cookies) 724 cookies[cookie_index] = saveoff; 725 ++cookie_index; 726 } else if (bref.type == HAMMER2_BREF_TYPE_DIRENT) { 727 uint16_t namlen; 728 729 dtype = hammer2_get_dtype(bref.embed.dirent.type); 730 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK; 731 namlen = bref.embed.dirent.namlen; 732 if (namlen <= sizeof(bref.check.buf)) { 733 dname = bref.check.buf; 734 } else { 735 dname = hammer2_xop_gdata(&xop->head)->buf; 736 } 737 r = vop_write_dirent(&error, uio, 738 bref.embed.dirent.inum, dtype, 739 namlen, dname); 740 if (namlen > sizeof(bref.check.buf)) 741 hammer2_xop_pdata(&xop->head); 742 if (r) 743 break; 744 if (cookies) 745 cookies[cookie_index] = saveoff; 746 ++cookie_index; 747 } else { 748 /* XXX chain error */ 749 kprintf("bad chain type readdir %d\n", bref.type); 750 } 751 } 752 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 753 if (error == ENOENT) { 754 error = 0; 755 eofflag = 1; 756 saveoff = (hammer2_key_t)-1; 757 } else { 758 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK; 759 } 760 done: 761 hammer2_inode_unlock(ip); 762 if (ap->a_eofflag) 763 *ap->a_eofflag = eofflag; 764 if (hammer2_debug & 0x0020) 765 kprintf("readdir: done at %016jx\n", saveoff); 766 uio->uio_offset = saveoff & ~HAMMER2_DIRHASH_VISIBLE; 767 if (error && cookie_index == 0) { 768 if (cookies) { 769 kfree(cookies, M_TEMP); 770 *ap->a_ncookies = 0; 771 *ap->a_cookies = NULL; 772 } 773 } else { 774 if (cookies) { 775 *ap->a_ncookies = cookie_index; 776 *ap->a_cookies = cookies; 777 } 778 } 779 return (error); 780 } 781 782 /* 783 * hammer2_vop_readlink { vp, uio, cred } 784 */ 785 static 786 int 787 hammer2_vop_readlink(struct vop_readlink_args *ap) 788 { 789 struct vnode *vp; 790 hammer2_inode_t *ip; 791 int error; 792 793 vp = ap->a_vp; 794 if (vp->v_type != VLNK) 795 return (EINVAL); 796 ip = VTOI(vp); 797 798 error = hammer2_read_file(ip, ap->a_uio, 0); 799 return (error); 800 } 801 802 static 803 int 804 hammer2_vop_read(struct vop_read_args *ap) 805 { 806 struct vnode *vp; 807 hammer2_inode_t *ip; 808 struct uio *uio; 809 int error; 810 int seqcount; 811 int bigread; 812 813 /* 814 * Read operations supported on this vnode? 815 */ 816 vp = ap->a_vp; 817 if (vp->v_type == VDIR) 818 return (EISDIR); 819 if (vp->v_type != VREG) 820 return (EINVAL); 821 822 /* 823 * Misc 824 */ 825 ip = VTOI(vp); 826 uio = ap->a_uio; 827 error = 0; 828 829 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 830 bigread = (uio->uio_resid > 100 * 1024 * 1024); 831 832 error = hammer2_read_file(ip, uio, seqcount); 833 return (error); 834 } 835 836 static 837 int 838 hammer2_vop_write(struct vop_write_args *ap) 839 { 840 hammer2_inode_t *ip; 841 thread_t td; 842 struct vnode *vp; 843 struct uio *uio; 844 int error; 845 int seqcount; 846 int ioflag; 847 848 /* 849 * Read operations supported on this vnode? 850 */ 851 vp = ap->a_vp; 852 if (vp->v_type != VREG) 853 return (EINVAL); 854 855 /* 856 * Misc 857 */ 858 ip = VTOI(vp); 859 ioflag = ap->a_ioflag; 860 uio = ap->a_uio; 861 error = 0; 862 if (ip->pmp->ronly || (ip->pmp->flags & HAMMER2_PMPF_EMERG)) 863 return (EROFS); 864 switch (hammer2_vfs_enospace(ip, uio->uio_resid, ap->a_cred)) { 865 case 2: 866 return (ENOSPC); 867 case 1: 868 ioflag |= IO_DIRECT; /* semi-synchronous */ 869 /* fall through */ 870 default: 871 break; 872 } 873 874 seqcount = ioflag >> IO_SEQSHIFT; 875 876 /* 877 * Check resource limit 878 */ 879 if (uio->uio_resid > 0 && (td = uio->uio_td) != NULL && td->td_proc && 880 uio->uio_offset + uio->uio_resid > 881 td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 882 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ); 883 return (EFBIG); 884 } 885 886 /* 887 * The transaction interlocks against flush initiations 888 * (note: but will run concurrently with the actual flush). 889 * 890 * To avoid deadlocking against the VM system, we must flag any 891 * transaction related to the buffer cache or other direct 892 * VM page manipulation. 893 */ 894 if (uio->uio_segflg == UIO_NOCOPY) { 895 hammer2_trans_init(ip->pmp, HAMMER2_TRANS_BUFCACHE); 896 } else { 897 hammer2_trans_init(ip->pmp, 0); 898 } 899 error = hammer2_write_file(ip, uio, ioflag, seqcount); 900 if (uio->uio_segflg == UIO_NOCOPY) 901 hammer2_trans_done(ip->pmp, HAMMER2_TRANS_BUFCACHE | 902 HAMMER2_TRANS_SIDEQ); 903 else 904 hammer2_trans_done(ip->pmp, HAMMER2_TRANS_SIDEQ); 905 906 return (error); 907 } 908 909 /* 910 * Perform read operations on a file or symlink given an UNLOCKED 911 * inode and uio. 912 * 913 * The passed ip is not locked. 914 */ 915 static 916 int 917 hammer2_read_file(hammer2_inode_t *ip, struct uio *uio, int seqcount) 918 { 919 hammer2_off_t size; 920 struct buf *bp; 921 int error; 922 923 error = 0; 924 925 /* 926 * UIO read loop. 927 * 928 * WARNING! Assumes that the kernel interlocks size changes at the 929 * vnode level. 930 */ 931 hammer2_mtx_sh(&ip->lock); 932 hammer2_mtx_sh(&ip->truncate_lock); 933 size = ip->meta.size; 934 hammer2_mtx_unlock(&ip->lock); 935 936 while (uio->uio_resid > 0 && uio->uio_offset < size) { 937 hammer2_key_t lbase; 938 hammer2_key_t leof; 939 int lblksize; 940 int loff; 941 int n; 942 943 lblksize = hammer2_calc_logical(ip, uio->uio_offset, 944 &lbase, &leof); 945 946 #if 1 947 bp = NULL; 948 error = cluster_readx(ip->vp, leof, lbase, lblksize, 949 B_NOTMETA | B_KVABIO, 950 uio->uio_resid, 951 seqcount * MAXBSIZE, 952 &bp); 953 #else 954 if (uio->uio_segflg == UIO_NOCOPY) { 955 bp = getblk(ip->vp, lbase, lblksize, 956 GETBLK_BHEAVY | GETBLK_KVABIO, 0); 957 if (bp->b_flags & B_CACHE) { 958 int i; 959 int j = 0; 960 if (bp->b_xio.xio_npages != 16) 961 kprintf("NPAGES BAD\n"); 962 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 963 vm_page_t m; 964 m = bp->b_xio.xio_pages[i]; 965 if (m == NULL || m->valid == 0) { 966 kprintf("bp %016jx %016jx pg %d inv", 967 lbase, leof, i); 968 if (m) 969 kprintf("m->object %p/%p", m->object, ip->vp->v_object); 970 kprintf("\n"); 971 j = 1; 972 } 973 } 974 if (j) 975 kprintf("b_flags %08x, b_error %d\n", bp->b_flags, bp->b_error); 976 } 977 bqrelse(bp); 978 } 979 error = bread_kvabio(ip->vp, lbase, lblksize, &bp); 980 #endif 981 if (error) { 982 brelse(bp); 983 break; 984 } 985 bkvasync(bp); 986 loff = (int)(uio->uio_offset - lbase); 987 n = lblksize - loff; 988 if (n > uio->uio_resid) 989 n = uio->uio_resid; 990 if (n > size - uio->uio_offset) 991 n = (int)(size - uio->uio_offset); 992 bp->b_flags |= B_AGE; 993 uiomovebp(bp, (char *)bp->b_data + loff, n, uio); 994 bqrelse(bp); 995 } 996 hammer2_mtx_unlock(&ip->truncate_lock); 997 998 return (error); 999 } 1000 1001 /* 1002 * Write to the file represented by the inode via the logical buffer cache. 1003 * The inode may represent a regular file or a symlink. 1004 * 1005 * The inode must not be locked. 1006 */ 1007 static 1008 int 1009 hammer2_write_file(hammer2_inode_t *ip, struct uio *uio, 1010 int ioflag, int seqcount) 1011 { 1012 hammer2_key_t old_eof; 1013 hammer2_key_t new_eof; 1014 struct buf *bp; 1015 int kflags; 1016 int error; 1017 int modified; 1018 1019 /* 1020 * Setup if append 1021 * 1022 * WARNING! Assumes that the kernel interlocks size changes at the 1023 * vnode level. 1024 */ 1025 hammer2_mtx_ex(&ip->lock); 1026 hammer2_mtx_sh(&ip->truncate_lock); 1027 if (ioflag & IO_APPEND) 1028 uio->uio_offset = ip->meta.size; 1029 old_eof = ip->meta.size; 1030 1031 /* 1032 * Extend the file if necessary. If the write fails at some point 1033 * we will truncate it back down to cover as much as we were able 1034 * to write. 1035 * 1036 * Doing this now makes it easier to calculate buffer sizes in 1037 * the loop. 1038 */ 1039 kflags = 0; 1040 error = 0; 1041 modified = 0; 1042 1043 if (uio->uio_offset + uio->uio_resid > old_eof) { 1044 new_eof = uio->uio_offset + uio->uio_resid; 1045 modified = 1; 1046 hammer2_extend_file(ip, new_eof); 1047 kflags |= NOTE_EXTEND; 1048 } else { 1049 new_eof = old_eof; 1050 } 1051 hammer2_mtx_unlock(&ip->lock); 1052 1053 /* 1054 * UIO write loop 1055 */ 1056 while (uio->uio_resid > 0) { 1057 hammer2_key_t lbase; 1058 int trivial; 1059 int endofblk; 1060 int lblksize; 1061 int loff; 1062 int n; 1063 1064 /* 1065 * Don't allow the buffer build to blow out the buffer 1066 * cache. 1067 */ 1068 if ((ioflag & IO_RECURSE) == 0) 1069 bwillwrite(HAMMER2_PBUFSIZE); 1070 1071 /* 1072 * This nominally tells us how much we can cluster and 1073 * what the logical buffer size needs to be. Currently 1074 * we don't try to cluster the write and just handle one 1075 * block at a time. 1076 */ 1077 lblksize = hammer2_calc_logical(ip, uio->uio_offset, 1078 &lbase, NULL); 1079 loff = (int)(uio->uio_offset - lbase); 1080 1081 KKASSERT(lblksize <= MAXBSIZE); 1082 1083 /* 1084 * Calculate bytes to copy this transfer and whether the 1085 * copy completely covers the buffer or not. 1086 */ 1087 trivial = 0; 1088 n = lblksize - loff; 1089 if (n > uio->uio_resid) { 1090 n = uio->uio_resid; 1091 if (loff == lbase && uio->uio_offset + n == new_eof) 1092 trivial = 1; 1093 endofblk = 0; 1094 } else { 1095 if (loff == 0) 1096 trivial = 1; 1097 endofblk = 1; 1098 } 1099 if (lbase >= new_eof) 1100 trivial = 1; 1101 1102 /* 1103 * Get the buffer 1104 */ 1105 if (uio->uio_segflg == UIO_NOCOPY) { 1106 /* 1107 * Issuing a write with the same data backing the 1108 * buffer. Instantiate the buffer to collect the 1109 * backing vm pages, then read-in any missing bits. 1110 * 1111 * This case is used by vop_stdputpages(). 1112 */ 1113 bp = getblk(ip->vp, lbase, lblksize, 1114 GETBLK_BHEAVY | GETBLK_KVABIO, 0); 1115 if ((bp->b_flags & B_CACHE) == 0) { 1116 bqrelse(bp); 1117 error = bread_kvabio(ip->vp, lbase, 1118 lblksize, &bp); 1119 } 1120 } else if (trivial) { 1121 /* 1122 * Even though we are entirely overwriting the buffer 1123 * we may still have to zero it out to avoid a 1124 * mmap/write visibility issue. 1125 */ 1126 bp = getblk(ip->vp, lbase, lblksize, 1127 GETBLK_BHEAVY | GETBLK_KVABIO, 0); 1128 if ((bp->b_flags & B_CACHE) == 0) 1129 vfs_bio_clrbuf(bp); 1130 } else { 1131 /* 1132 * Partial overwrite, read in any missing bits then 1133 * replace the portion being written. 1134 * 1135 * (The strategy code will detect zero-fill physical 1136 * blocks for this case). 1137 */ 1138 error = bread_kvabio(ip->vp, lbase, lblksize, &bp); 1139 if (error == 0) 1140 bheavy(bp); 1141 } 1142 1143 if (error) { 1144 brelse(bp); 1145 break; 1146 } 1147 1148 /* 1149 * Ok, copy the data in 1150 */ 1151 bkvasync(bp); 1152 error = uiomovebp(bp, bp->b_data + loff, n, uio); 1153 kflags |= NOTE_WRITE; 1154 modified = 1; 1155 if (error) { 1156 brelse(bp); 1157 break; 1158 } 1159 1160 /* 1161 * WARNING: Pageout daemon will issue UIO_NOCOPY writes 1162 * with IO_SYNC or IO_ASYNC set. These writes 1163 * must be handled as the pageout daemon expects. 1164 * 1165 * NOTE! H2 relies on cluster_write() here because it 1166 * cannot preallocate disk blocks at the logical 1167 * level due to not knowing what the compression 1168 * size will be at this time. 1169 * 1170 * We must use cluster_write() here and we depend 1171 * on the write-behind feature to flush buffers 1172 * appropriately. If we let the buffer daemons do 1173 * it the block allocations will be all over the 1174 * map. 1175 */ 1176 if (ioflag & IO_SYNC) { 1177 bwrite(bp); 1178 } else if ((ioflag & IO_DIRECT) && endofblk) { 1179 bawrite(bp); 1180 } else if (ioflag & IO_ASYNC) { 1181 bawrite(bp); 1182 } else if (ip->vp->v_mount->mnt_flag & MNT_NOCLUSTERW) { 1183 bdwrite(bp); 1184 } else { 1185 #if 1 1186 bp->b_flags |= B_CLUSTEROK; 1187 cluster_write(bp, new_eof, lblksize, seqcount); 1188 #else 1189 bp->b_flags |= B_CLUSTEROK; 1190 bdwrite(bp); 1191 #endif 1192 } 1193 } 1194 1195 /* 1196 * Cleanup. If we extended the file EOF but failed to write through 1197 * the entire write is a failure and we have to back-up. 1198 */ 1199 if (error && new_eof != old_eof) { 1200 hammer2_mtx_unlock(&ip->truncate_lock); 1201 hammer2_mtx_ex(&ip->lock); /* note lock order */ 1202 hammer2_mtx_ex(&ip->truncate_lock); /* note lock order */ 1203 hammer2_truncate_file(ip, old_eof); 1204 if (ip->flags & HAMMER2_INODE_MODIFIED) 1205 hammer2_inode_chain_sync(ip); 1206 hammer2_mtx_unlock(&ip->lock); 1207 } else if (modified) { 1208 struct vnode *vp = ip->vp; 1209 1210 hammer2_mtx_ex(&ip->lock); 1211 hammer2_inode_modify(ip); 1212 if (uio->uio_segflg == UIO_NOCOPY) { 1213 if (vp->v_flag & VLASTWRITETS) { 1214 ip->meta.mtime = 1215 (unsigned long)vp->v_lastwrite_ts.tv_sec * 1216 1000000 + 1217 vp->v_lastwrite_ts.tv_nsec / 1000; 1218 } 1219 } else { 1220 hammer2_update_time(&ip->meta.mtime); 1221 vclrflags(vp, VLASTWRITETS); 1222 } 1223 1224 #if 0 1225 /* 1226 * REMOVED - handled by hammer2_extend_file(). Do not issue 1227 * a chain_sync() outside of a sync/fsync except for DIRECTDATA 1228 * state changes. 1229 * 1230 * Under normal conditions we only issue a chain_sync if 1231 * the inode's DIRECTDATA state changed. 1232 */ 1233 if (ip->flags & HAMMER2_INODE_RESIZED) 1234 hammer2_inode_chain_sync(ip); 1235 #endif 1236 hammer2_mtx_unlock(&ip->lock); 1237 hammer2_knote(ip->vp, kflags); 1238 } 1239 hammer2_trans_assert_strategy(ip->pmp); 1240 hammer2_mtx_unlock(&ip->truncate_lock); 1241 1242 return error; 1243 } 1244 1245 /* 1246 * Truncate the size of a file. The inode must be locked. 1247 * 1248 * We must unconditionally set HAMMER2_INODE_RESIZED to properly 1249 * ensure that any on-media data beyond the new file EOF has been destroyed. 1250 * 1251 * WARNING: nvtruncbuf() can only be safely called without the inode lock 1252 * held due to the way our write thread works. If the truncation 1253 * occurs in the middle of a buffer, nvtruncbuf() is responsible 1254 * for dirtying that buffer and zeroing out trailing bytes. 1255 * 1256 * WARNING! Assumes that the kernel interlocks size changes at the 1257 * vnode level. 1258 * 1259 * WARNING! Caller assumes responsibility for removing dead blocks 1260 * if INODE_RESIZED is set. 1261 */ 1262 static 1263 void 1264 hammer2_truncate_file(hammer2_inode_t *ip, hammer2_key_t nsize) 1265 { 1266 hammer2_key_t lbase; 1267 int nblksize; 1268 1269 hammer2_mtx_unlock(&ip->lock); 1270 if (ip->vp) { 1271 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL); 1272 nvtruncbuf(ip->vp, nsize, 1273 nblksize, (int)nsize & (nblksize - 1), 1274 0); 1275 } 1276 hammer2_mtx_ex(&ip->lock); 1277 KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0); 1278 ip->osize = ip->meta.size; 1279 ip->meta.size = nsize; 1280 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED); 1281 hammer2_inode_modify(ip); 1282 } 1283 1284 /* 1285 * Extend the size of a file. The inode must be locked. 1286 * 1287 * Even though the file size is changing, we do not have to set the 1288 * INODE_RESIZED bit unless the file size crosses the EMBEDDED_BYTES 1289 * boundary. When this occurs a hammer2_inode_chain_sync() is required 1290 * to prepare the inode cluster's indirect block table, otherwise 1291 * async execution of the strategy code will implode on us. 1292 * 1293 * WARNING! Assumes that the kernel interlocks size changes at the 1294 * vnode level. 1295 * 1296 * WARNING! Caller assumes responsibility for transitioning out 1297 * of the inode DIRECTDATA mode if INODE_RESIZED is set. 1298 */ 1299 static 1300 void 1301 hammer2_extend_file(hammer2_inode_t *ip, hammer2_key_t nsize) 1302 { 1303 hammer2_key_t lbase; 1304 hammer2_key_t osize; 1305 int oblksize; 1306 int nblksize; 1307 int error; 1308 1309 KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0); 1310 hammer2_inode_modify(ip); 1311 osize = ip->meta.size; 1312 ip->osize = osize; 1313 ip->meta.size = nsize; 1314 1315 /* 1316 * We must issue a chain_sync() when the DIRECTDATA state changes 1317 * to prevent confusion between the flush code and the in-memory 1318 * state. This is not perfect because we are doing it outside of 1319 * a sync/fsync operation, so it might not be fully synchronized 1320 * with the meta-data topology flush. 1321 * 1322 * We must retain and re-dirty the buffer cache buffer containing 1323 * the direct data so it can be written to a real block. It should 1324 * not be possible for a bread error to occur since the original data 1325 * is extracted from the inode structure directly. 1326 */ 1327 if (osize <= HAMMER2_EMBEDDED_BYTES && nsize > HAMMER2_EMBEDDED_BYTES) { 1328 if (osize) { 1329 struct buf *bp; 1330 1331 oblksize = hammer2_calc_logical(ip, 0, NULL, NULL); 1332 error = bread_kvabio(ip->vp, 0, oblksize, &bp); 1333 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED); 1334 hammer2_inode_chain_sync(ip); 1335 if (error == 0) { 1336 bheavy(bp); 1337 bdwrite(bp); 1338 } else { 1339 brelse(bp); 1340 } 1341 } else { 1342 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED); 1343 hammer2_inode_chain_sync(ip); 1344 } 1345 } 1346 hammer2_mtx_unlock(&ip->lock); 1347 if (ip->vp) { 1348 oblksize = hammer2_calc_logical(ip, osize, &lbase, NULL); 1349 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL); 1350 nvextendbuf(ip->vp, 1351 osize, nsize, 1352 oblksize, nblksize, 1353 -1, -1, 0); 1354 } 1355 hammer2_mtx_ex(&ip->lock); 1356 } 1357 1358 static 1359 int 1360 hammer2_vop_nresolve(struct vop_nresolve_args *ap) 1361 { 1362 hammer2_xop_nresolve_t *xop; 1363 hammer2_inode_t *ip; 1364 hammer2_inode_t *dip; 1365 struct namecache *ncp; 1366 struct vnode *vp; 1367 int error; 1368 1369 dip = VTOI(ap->a_dvp); 1370 xop = hammer2_xop_alloc(dip, 0); 1371 1372 ncp = ap->a_nch->ncp; 1373 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen); 1374 1375 /* 1376 * Note: In DragonFly the kernel handles '.' and '..'. 1377 */ 1378 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1379 hammer2_xop_start(&xop->head, &hammer2_nresolve_desc); 1380 1381 error = hammer2_xop_collect(&xop->head, 0); 1382 error = hammer2_error_to_errno(error); 1383 if (error) { 1384 ip = NULL; 1385 } else { 1386 ip = hammer2_inode_get(dip->pmp, &xop->head, -1, -1); 1387 } 1388 hammer2_inode_unlock(dip); 1389 1390 /* 1391 * Acquire the related vnode 1392 * 1393 * NOTE: For error processing, only ENOENT resolves the namecache 1394 * entry to NULL, otherwise we just return the error and 1395 * leave the namecache unresolved. 1396 * 1397 * NOTE: multiple hammer2_inode structures can be aliased to the 1398 * same chain element, for example for hardlinks. This 1399 * use case does not 'reattach' inode associations that 1400 * might already exist, but always allocates a new one. 1401 * 1402 * WARNING: inode structure is locked exclusively via inode_get 1403 * but chain was locked shared. inode_unlock() 1404 * will handle it properly. 1405 */ 1406 if (ip) { 1407 vp = hammer2_igetv(ip, &error); /* error set to UNIX error */ 1408 if (error == 0) { 1409 vn_unlock(vp); 1410 cache_setvp(ap->a_nch, vp); 1411 } else if (error == ENOENT) { 1412 cache_setvp(ap->a_nch, NULL); 1413 } 1414 hammer2_inode_unlock(ip); 1415 1416 /* 1417 * The vp should not be released until after we've disposed 1418 * of our locks, because it might cause vop_inactive() to 1419 * be called. 1420 */ 1421 if (vp) 1422 vrele(vp); 1423 } else { 1424 error = ENOENT; 1425 cache_setvp(ap->a_nch, NULL); 1426 } 1427 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1428 KASSERT(error || ap->a_nch->ncp->nc_vp != NULL, 1429 ("resolve error %d/%p ap %p\n", 1430 error, ap->a_nch->ncp->nc_vp, ap)); 1431 1432 return error; 1433 } 1434 1435 static 1436 int 1437 hammer2_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap) 1438 { 1439 hammer2_inode_t *dip; 1440 hammer2_tid_t inum; 1441 int error; 1442 1443 dip = VTOI(ap->a_dvp); 1444 inum = dip->meta.iparent; 1445 *ap->a_vpp = NULL; 1446 1447 if (inum) { 1448 error = hammer2_vfs_vget(ap->a_dvp->v_mount, NULL, 1449 inum, ap->a_vpp); 1450 } else { 1451 error = ENOENT; 1452 } 1453 return error; 1454 } 1455 1456 static 1457 int 1458 hammer2_vop_nmkdir(struct vop_nmkdir_args *ap) 1459 { 1460 hammer2_inode_t *dip; 1461 hammer2_inode_t *nip; 1462 struct namecache *ncp; 1463 const uint8_t *name; 1464 size_t name_len; 1465 hammer2_tid_t inum; 1466 int error; 1467 1468 dip = VTOI(ap->a_dvp); 1469 if (dip->pmp->ronly || (dip->pmp->flags & HAMMER2_PMPF_EMERG)) 1470 return (EROFS); 1471 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1472 return (ENOSPC); 1473 1474 ncp = ap->a_nch->ncp; 1475 name = ncp->nc_name; 1476 name_len = ncp->nc_nlen; 1477 1478 hammer2_trans_init(dip->pmp, 0); 1479 1480 inum = hammer2_trans_newinum(dip->pmp); 1481 1482 /* 1483 * Create the actual inode as a hidden file in the iroot, then 1484 * create the directory entry. The creation of the actual inode 1485 * sets its nlinks to 1 which is the value we desire. 1486 * 1487 * dip must be locked before nip to avoid deadlock. 1488 */ 1489 hammer2_inode_lock(dip, 0); 1490 nip = hammer2_inode_create_normal(dip, ap->a_vap, ap->a_cred, 1491 inum, &error); 1492 if (error) { 1493 error = hammer2_error_to_errno(error); 1494 } else { 1495 error = hammer2_dirent_create(dip, name, name_len, 1496 nip->meta.inum, nip->meta.type); 1497 /* returns UNIX error code */ 1498 } 1499 if (error) { 1500 if (nip) { 1501 hammer2_inode_unlink_finisher(nip, 0); 1502 hammer2_inode_unlock(nip); 1503 nip = NULL; 1504 } 1505 *ap->a_vpp = NULL; 1506 } else { 1507 /* 1508 * inode_depend() must occur before the igetv() because 1509 * the igetv() can temporarily release the inode lock. 1510 */ 1511 hammer2_inode_depend(dip, nip); /* before igetv */ 1512 *ap->a_vpp = hammer2_igetv(nip, &error); 1513 hammer2_inode_unlock(nip); 1514 } 1515 1516 /* 1517 * Update dip's mtime 1518 * 1519 * We can use a shared inode lock and allow the meta.mtime update 1520 * SMP race. hammer2_inode_modify() is MPSAFE w/a shared lock. 1521 */ 1522 if (error == 0) { 1523 uint64_t mtime; 1524 1525 /*hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);*/ 1526 hammer2_update_time(&mtime); 1527 hammer2_inode_modify(dip); 1528 dip->meta.mtime = mtime; 1529 /*hammer2_inode_unlock(dip);*/ 1530 } 1531 hammer2_inode_unlock(dip); 1532 1533 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 1534 1535 if (error == 0) { 1536 cache_setunresolved(ap->a_nch); 1537 cache_setvp(ap->a_nch, *ap->a_vpp); 1538 hammer2_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1539 } 1540 return error; 1541 } 1542 1543 static 1544 int 1545 hammer2_vop_open(struct vop_open_args *ap) 1546 { 1547 return vop_stdopen(ap); 1548 } 1549 1550 /* 1551 * hammer2_vop_advlock { vp, id, op, fl, flags } 1552 */ 1553 static 1554 int 1555 hammer2_vop_advlock(struct vop_advlock_args *ap) 1556 { 1557 hammer2_inode_t *ip = VTOI(ap->a_vp); 1558 hammer2_off_t size; 1559 1560 size = ip->meta.size; 1561 return (lf_advlock(ap, &ip->advlock, size)); 1562 } 1563 1564 static 1565 int 1566 hammer2_vop_close(struct vop_close_args *ap) 1567 { 1568 return vop_stdclose(ap); 1569 } 1570 1571 /* 1572 * hammer2_vop_nlink { nch, dvp, vp, cred } 1573 * 1574 * Create a hardlink from (vp) to {dvp, nch}. 1575 */ 1576 static 1577 int 1578 hammer2_vop_nlink(struct vop_nlink_args *ap) 1579 { 1580 hammer2_inode_t *tdip; /* target directory to create link in */ 1581 hammer2_inode_t *ip; /* inode we are hardlinking to */ 1582 struct namecache *ncp; 1583 const uint8_t *name; 1584 size_t name_len; 1585 int error; 1586 1587 if (ap->a_dvp->v_mount != ap->a_vp->v_mount) 1588 return(EXDEV); 1589 1590 tdip = VTOI(ap->a_dvp); 1591 if (tdip->pmp->ronly || (tdip->pmp->flags & HAMMER2_PMPF_EMERG)) 1592 return (EROFS); 1593 if (hammer2_vfs_enospace(tdip, 0, ap->a_cred) > 1) 1594 return (ENOSPC); 1595 1596 ncp = ap->a_nch->ncp; 1597 name = ncp->nc_name; 1598 name_len = ncp->nc_nlen; 1599 1600 /* 1601 * ip represents the file being hardlinked. The file could be a 1602 * normal file or a hardlink target if it has already been hardlinked. 1603 * (with the new semantics, it will almost always be a hardlink 1604 * target). 1605 * 1606 * Bump nlinks and potentially also create or move the hardlink 1607 * target in the parent directory common to (ip) and (tdip). The 1608 * consolidation code can modify ip->cluster. The returned cluster 1609 * is locked. 1610 */ 1611 ip = VTOI(ap->a_vp); 1612 KASSERT(ip->pmp, ("ip->pmp is NULL %p %p", ip, ip->pmp)); 1613 hammer2_trans_init(ip->pmp, 0); 1614 1615 /* 1616 * Target should be an indexed inode or there's no way we will ever 1617 * be able to find it! 1618 */ 1619 KKASSERT((ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE) == 0); 1620 1621 error = 0; 1622 1623 /* 1624 * Can return NULL and error == EXDEV if the common parent 1625 * crosses a directory with the xlink flag set. 1626 */ 1627 hammer2_inode_lock4(tdip, ip, NULL, NULL); 1628 1629 /* 1630 * Create the directory entry and bump nlinks. 1631 */ 1632 if (error == 0) { 1633 error = hammer2_dirent_create(tdip, name, name_len, 1634 ip->meta.inum, ip->meta.type); 1635 hammer2_inode_modify(ip); 1636 ++ip->meta.nlinks; 1637 } 1638 if (error == 0) { 1639 /* 1640 * Update dip's mtime 1641 */ 1642 uint64_t mtime; 1643 1644 hammer2_update_time(&mtime); 1645 hammer2_inode_modify(tdip); 1646 tdip->meta.mtime = mtime; 1647 1648 cache_setunresolved(ap->a_nch); 1649 cache_setvp(ap->a_nch, ap->a_vp); 1650 } 1651 hammer2_inode_unlock(ip); 1652 hammer2_inode_unlock(tdip); 1653 1654 hammer2_trans_done(ip->pmp, HAMMER2_TRANS_SIDEQ); 1655 hammer2_knote(ap->a_vp, NOTE_LINK); 1656 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1657 1658 return error; 1659 } 1660 1661 /* 1662 * hammer2_vop_ncreate { nch, dvp, vpp, cred, vap } 1663 * 1664 * The operating system has already ensured that the directory entry 1665 * does not exist and done all appropriate namespace locking. 1666 */ 1667 static 1668 int 1669 hammer2_vop_ncreate(struct vop_ncreate_args *ap) 1670 { 1671 hammer2_inode_t *dip; 1672 hammer2_inode_t *nip; 1673 struct namecache *ncp; 1674 const uint8_t *name; 1675 size_t name_len; 1676 hammer2_tid_t inum; 1677 int error; 1678 1679 dip = VTOI(ap->a_dvp); 1680 if (dip->pmp->ronly || (dip->pmp->flags & HAMMER2_PMPF_EMERG)) 1681 return (EROFS); 1682 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1683 return (ENOSPC); 1684 1685 ncp = ap->a_nch->ncp; 1686 name = ncp->nc_name; 1687 name_len = ncp->nc_nlen; 1688 hammer2_trans_init(dip->pmp, 0); 1689 1690 inum = hammer2_trans_newinum(dip->pmp); 1691 1692 /* 1693 * Create the actual inode as a hidden file in the iroot, then 1694 * create the directory entry. The creation of the actual inode 1695 * sets its nlinks to 1 which is the value we desire. 1696 * 1697 * dip must be locked before nip to avoid deadlock. 1698 */ 1699 hammer2_inode_lock(dip, 0); 1700 nip = hammer2_inode_create_normal(dip, ap->a_vap, ap->a_cred, 1701 inum, &error); 1702 1703 if (error) { 1704 error = hammer2_error_to_errno(error); 1705 } else { 1706 error = hammer2_dirent_create(dip, name, name_len, 1707 nip->meta.inum, nip->meta.type); 1708 } 1709 if (error) { 1710 if (nip) { 1711 hammer2_inode_unlink_finisher(nip, 0); 1712 hammer2_inode_unlock(nip); 1713 nip = NULL; 1714 } 1715 *ap->a_vpp = NULL; 1716 } else { 1717 hammer2_inode_depend(dip, nip); /* before igetv */ 1718 *ap->a_vpp = hammer2_igetv(nip, &error); 1719 hammer2_inode_unlock(nip); 1720 } 1721 1722 /* 1723 * Update dip's mtime 1724 */ 1725 if (error == 0) { 1726 uint64_t mtime; 1727 1728 /*hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);*/ 1729 hammer2_update_time(&mtime); 1730 hammer2_inode_modify(dip); 1731 dip->meta.mtime = mtime; 1732 /*hammer2_inode_unlock(dip);*/ 1733 } 1734 hammer2_inode_unlock(dip); 1735 1736 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 1737 1738 if (error == 0) { 1739 cache_setunresolved(ap->a_nch); 1740 cache_setvp(ap->a_nch, *ap->a_vpp); 1741 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1742 } 1743 return error; 1744 } 1745 1746 /* 1747 * Make a device node (typically a fifo) 1748 */ 1749 static 1750 int 1751 hammer2_vop_nmknod(struct vop_nmknod_args *ap) 1752 { 1753 hammer2_inode_t *dip; 1754 hammer2_inode_t *nip; 1755 struct namecache *ncp; 1756 const uint8_t *name; 1757 size_t name_len; 1758 hammer2_tid_t inum; 1759 int error; 1760 1761 dip = VTOI(ap->a_dvp); 1762 if (dip->pmp->ronly || (dip->pmp->flags & HAMMER2_PMPF_EMERG)) 1763 return (EROFS); 1764 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1765 return (ENOSPC); 1766 1767 ncp = ap->a_nch->ncp; 1768 name = ncp->nc_name; 1769 name_len = ncp->nc_nlen; 1770 hammer2_trans_init(dip->pmp, 0); 1771 1772 /* 1773 * Create the device inode and then create the directory entry. 1774 * 1775 * dip must be locked before nip to avoid deadlock. 1776 */ 1777 inum = hammer2_trans_newinum(dip->pmp); 1778 1779 hammer2_inode_lock(dip, 0); 1780 nip = hammer2_inode_create_normal(dip, ap->a_vap, ap->a_cred, 1781 inum, &error); 1782 if (error == 0) { 1783 error = hammer2_dirent_create(dip, name, name_len, 1784 nip->meta.inum, nip->meta.type); 1785 } 1786 if (error) { 1787 if (nip) { 1788 hammer2_inode_unlink_finisher(nip, 0); 1789 hammer2_inode_unlock(nip); 1790 nip = NULL; 1791 } 1792 *ap->a_vpp = NULL; 1793 } else { 1794 hammer2_inode_depend(dip, nip); /* before igetv */ 1795 *ap->a_vpp = hammer2_igetv(nip, &error); 1796 hammer2_inode_unlock(nip); 1797 } 1798 1799 /* 1800 * Update dip's mtime 1801 */ 1802 if (error == 0) { 1803 uint64_t mtime; 1804 1805 /*hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);*/ 1806 hammer2_update_time(&mtime); 1807 hammer2_inode_modify(dip); 1808 dip->meta.mtime = mtime; 1809 /*hammer2_inode_unlock(dip);*/ 1810 } 1811 hammer2_inode_unlock(dip); 1812 1813 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 1814 1815 if (error == 0) { 1816 cache_setunresolved(ap->a_nch); 1817 cache_setvp(ap->a_nch, *ap->a_vpp); 1818 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1819 } 1820 return error; 1821 } 1822 1823 /* 1824 * hammer2_vop_nsymlink { nch, dvp, vpp, cred, vap, target } 1825 */ 1826 static 1827 int 1828 hammer2_vop_nsymlink(struct vop_nsymlink_args *ap) 1829 { 1830 hammer2_inode_t *dip; 1831 hammer2_inode_t *nip; 1832 struct namecache *ncp; 1833 const uint8_t *name; 1834 size_t name_len; 1835 hammer2_tid_t inum; 1836 int error; 1837 1838 dip = VTOI(ap->a_dvp); 1839 if (dip->pmp->ronly || (dip->pmp->flags & HAMMER2_PMPF_EMERG)) 1840 return (EROFS); 1841 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1842 return (ENOSPC); 1843 1844 ncp = ap->a_nch->ncp; 1845 name = ncp->nc_name; 1846 name_len = ncp->nc_nlen; 1847 hammer2_trans_init(dip->pmp, 0); 1848 1849 ap->a_vap->va_type = VLNK; /* enforce type */ 1850 1851 /* 1852 * Create the softlink as an inode and then create the directory 1853 * entry. 1854 * 1855 * dip must be locked before nip to avoid deadlock. 1856 */ 1857 inum = hammer2_trans_newinum(dip->pmp); 1858 1859 hammer2_inode_lock(dip, 0); 1860 nip = hammer2_inode_create_normal(dip, ap->a_vap, ap->a_cred, 1861 inum, &error); 1862 if (error == 0) { 1863 error = hammer2_dirent_create(dip, name, name_len, 1864 nip->meta.inum, nip->meta.type); 1865 } 1866 if (error) { 1867 if (nip) { 1868 hammer2_inode_unlink_finisher(nip, 0); 1869 hammer2_inode_unlock(nip); 1870 nip = NULL; 1871 } 1872 *ap->a_vpp = NULL; 1873 hammer2_inode_unlock(dip); 1874 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 1875 return error; 1876 } 1877 hammer2_inode_depend(dip, nip); /* before igetv */ 1878 *ap->a_vpp = hammer2_igetv(nip, &error); 1879 1880 /* 1881 * Build the softlink (~like file data) and finalize the namecache. 1882 */ 1883 if (error == 0) { 1884 size_t bytes; 1885 struct uio auio; 1886 struct iovec aiov; 1887 1888 bytes = strlen(ap->a_target); 1889 1890 hammer2_inode_unlock(nip); 1891 bzero(&auio, sizeof(auio)); 1892 bzero(&aiov, sizeof(aiov)); 1893 auio.uio_iov = &aiov; 1894 auio.uio_segflg = UIO_SYSSPACE; 1895 auio.uio_rw = UIO_WRITE; 1896 auio.uio_resid = bytes; 1897 auio.uio_iovcnt = 1; 1898 auio.uio_td = curthread; 1899 aiov.iov_base = ap->a_target; 1900 aiov.iov_len = bytes; 1901 error = hammer2_write_file(nip, &auio, IO_APPEND, 0); 1902 /* XXX handle error */ 1903 error = 0; 1904 } else { 1905 hammer2_inode_unlock(nip); 1906 } 1907 1908 /* 1909 * Update dip's mtime 1910 */ 1911 if (error == 0) { 1912 uint64_t mtime; 1913 1914 /*hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);*/ 1915 hammer2_update_time(&mtime); 1916 hammer2_inode_modify(dip); 1917 dip->meta.mtime = mtime; 1918 /*hammer2_inode_unlock(dip);*/ 1919 } 1920 hammer2_inode_unlock(dip); 1921 1922 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 1923 1924 /* 1925 * Finalize namecache 1926 */ 1927 if (error == 0) { 1928 cache_setunresolved(ap->a_nch); 1929 cache_setvp(ap->a_nch, *ap->a_vpp); 1930 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1931 } 1932 return error; 1933 } 1934 1935 /* 1936 * hammer2_vop_nremove { nch, dvp, cred } 1937 */ 1938 static 1939 int 1940 hammer2_vop_nremove(struct vop_nremove_args *ap) 1941 { 1942 hammer2_xop_unlink_t *xop; 1943 hammer2_inode_t *dip; 1944 hammer2_inode_t *ip; 1945 struct namecache *ncp; 1946 int error; 1947 int isopen; 1948 1949 dip = VTOI(ap->a_dvp); 1950 if (dip->pmp->ronly) 1951 return (EROFS); 1952 #if 0 1953 /* allow removals, except user to also bulkfree */ 1954 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1955 return (ENOSPC); 1956 #endif 1957 1958 ncp = ap->a_nch->ncp; 1959 1960 if (hammer2_debug_inode && dip->meta.inum == hammer2_debug_inode) { 1961 kprintf("hammer2: attempt to delete inside debug inode: %s\n", 1962 ncp->nc_name); 1963 while (hammer2_debug_inode && 1964 dip->meta.inum == hammer2_debug_inode) { 1965 tsleep(&hammer2_debug_inode, 0, "h2debug", hz*5); 1966 } 1967 } 1968 1969 hammer2_trans_init(dip->pmp, 0); 1970 hammer2_inode_lock(dip, 0); 1971 1972 /* 1973 * The unlink XOP unlinks the path from the directory and 1974 * locates and returns the cluster associated with the real inode. 1975 * We have to handle nlinks here on the frontend. 1976 */ 1977 xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING); 1978 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen); 1979 1980 /* 1981 * The namecache entry is locked so nobody can use this namespace. 1982 * Calculate isopen to determine if this namespace has an open vp 1983 * associated with it and resolve the vp only if it does. 1984 * 1985 * We try to avoid resolving the vnode if nobody has it open, but 1986 * note that the test is via this namespace only. 1987 */ 1988 isopen = cache_isopen(ap->a_nch); 1989 xop->isdir = 0; 1990 xop->dopermanent = 0; 1991 hammer2_xop_start(&xop->head, &hammer2_unlink_desc); 1992 1993 /* 1994 * Collect the real inode and adjust nlinks, destroy the real 1995 * inode if nlinks transitions to 0 and it was the real inode 1996 * (else it has already been removed). 1997 */ 1998 error = hammer2_xop_collect(&xop->head, 0); 1999 error = hammer2_error_to_errno(error); 2000 2001 if (error == 0) { 2002 ip = hammer2_inode_get(dip->pmp, &xop->head, -1, -1); 2003 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 2004 if (ip) { 2005 if (hammer2_debug_inode && 2006 ip->meta.inum == hammer2_debug_inode) { 2007 kprintf("hammer2: attempt to delete debug " 2008 "inode!\n"); 2009 while (hammer2_debug_inode && 2010 ip->meta.inum == hammer2_debug_inode) { 2011 tsleep(&hammer2_debug_inode, 0, 2012 "h2debug", hz*5); 2013 } 2014 } 2015 hammer2_inode_unlink_finisher(ip, isopen); 2016 hammer2_inode_depend(dip, ip); /* after modified */ 2017 hammer2_inode_unlock(ip); 2018 } 2019 } else { 2020 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 2021 } 2022 2023 /* 2024 * Update dip's mtime 2025 */ 2026 if (error == 0) { 2027 uint64_t mtime; 2028 2029 /*hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);*/ 2030 hammer2_update_time(&mtime); 2031 hammer2_inode_modify(dip); 2032 dip->meta.mtime = mtime; 2033 /*hammer2_inode_unlock(dip);*/ 2034 } 2035 hammer2_inode_unlock(dip); 2036 2037 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 2038 if (error == 0) { 2039 cache_unlink(ap->a_nch); 2040 hammer2_knote(ap->a_dvp, NOTE_WRITE); 2041 } 2042 return (error); 2043 } 2044 2045 /* 2046 * hammer2_vop_nrmdir { nch, dvp, cred } 2047 */ 2048 static 2049 int 2050 hammer2_vop_nrmdir(struct vop_nrmdir_args *ap) 2051 { 2052 hammer2_xop_unlink_t *xop; 2053 hammer2_inode_t *dip; 2054 hammer2_inode_t *ip; 2055 struct namecache *ncp; 2056 int isopen; 2057 int error; 2058 2059 dip = VTOI(ap->a_dvp); 2060 if (dip->pmp->ronly) 2061 return (EROFS); 2062 #if 0 2063 /* allow removals, except user to also bulkfree */ 2064 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 2065 return (ENOSPC); 2066 #endif 2067 2068 hammer2_trans_init(dip->pmp, 0); 2069 hammer2_inode_lock(dip, 0); 2070 2071 xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING); 2072 2073 ncp = ap->a_nch->ncp; 2074 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen); 2075 isopen = cache_isopen(ap->a_nch); 2076 xop->isdir = 1; 2077 xop->dopermanent = 0; 2078 hammer2_xop_start(&xop->head, &hammer2_unlink_desc); 2079 2080 /* 2081 * Collect the real inode and adjust nlinks, destroy the real 2082 * inode if nlinks transitions to 0 and it was the real inode 2083 * (else it has already been removed). 2084 */ 2085 error = hammer2_xop_collect(&xop->head, 0); 2086 error = hammer2_error_to_errno(error); 2087 2088 if (error == 0) { 2089 ip = hammer2_inode_get(dip->pmp, &xop->head, -1, -1); 2090 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 2091 if (ip) { 2092 hammer2_inode_unlink_finisher(ip, isopen); 2093 hammer2_inode_depend(dip, ip); /* after modified */ 2094 hammer2_inode_unlock(ip); 2095 } 2096 } else { 2097 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 2098 } 2099 2100 /* 2101 * Update dip's mtime 2102 */ 2103 if (error == 0) { 2104 uint64_t mtime; 2105 2106 /*hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);*/ 2107 hammer2_update_time(&mtime); 2108 hammer2_inode_modify(dip); 2109 dip->meta.mtime = mtime; 2110 /*hammer2_inode_unlock(dip);*/ 2111 } 2112 hammer2_inode_unlock(dip); 2113 2114 hammer2_trans_done(dip->pmp, HAMMER2_TRANS_SIDEQ); 2115 if (error == 0) { 2116 cache_unlink(ap->a_nch); 2117 hammer2_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 2118 } 2119 return (error); 2120 } 2121 2122 /* 2123 * hammer2_vop_nrename { fnch, tnch, fdvp, tdvp, cred } 2124 */ 2125 static 2126 int 2127 hammer2_vop_nrename(struct vop_nrename_args *ap) 2128 { 2129 struct namecache *fncp; 2130 struct namecache *tncp; 2131 hammer2_inode_t *fdip; /* source directory */ 2132 hammer2_inode_t *tdip; /* target directory */ 2133 hammer2_inode_t *ip; /* file being renamed */ 2134 hammer2_inode_t *tip; /* replaced target during rename or NULL */ 2135 const uint8_t *fname; 2136 size_t fname_len; 2137 const uint8_t *tname; 2138 size_t tname_len; 2139 int error; 2140 int update_tdip; 2141 int update_fdip; 2142 hammer2_key_t tlhc; 2143 2144 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount) 2145 return(EXDEV); 2146 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount) 2147 return(EXDEV); 2148 2149 fdip = VTOI(ap->a_fdvp); /* source directory */ 2150 tdip = VTOI(ap->a_tdvp); /* target directory */ 2151 2152 if (fdip->pmp->ronly || (fdip->pmp->flags & HAMMER2_PMPF_EMERG)) 2153 return (EROFS); 2154 if (hammer2_vfs_enospace(fdip, 0, ap->a_cred) > 1) 2155 return (ENOSPC); 2156 2157 fncp = ap->a_fnch->ncp; /* entry name in source */ 2158 fname = fncp->nc_name; 2159 fname_len = fncp->nc_nlen; 2160 2161 tncp = ap->a_tnch->ncp; /* entry name in target */ 2162 tname = tncp->nc_name; 2163 tname_len = tncp->nc_nlen; 2164 2165 hammer2_trans_init(tdip->pmp, 0); 2166 2167 update_tdip = 0; 2168 update_fdip = 0; 2169 2170 ip = VTOI(fncp->nc_vp); 2171 hammer2_inode_ref(ip); /* extra ref */ 2172 2173 /* 2174 * Lookup the target name to determine if a directory entry 2175 * is being overwritten. We only hold related inode locks 2176 * temporarily, the operating system is expected to protect 2177 * against rename races. 2178 */ 2179 tip = tncp->nc_vp ? VTOI(tncp->nc_vp) : NULL; 2180 if (tip) 2181 hammer2_inode_ref(tip); /* extra ref */ 2182 2183 /* 2184 * Can return NULL and error == EXDEV if the common parent 2185 * crosses a directory with the xlink flag set. 2186 * 2187 * For now try to avoid deadlocks with a simple pointer address 2188 * test. (tip) can be NULL. 2189 */ 2190 error = 0; 2191 { 2192 hammer2_inode_t *ip1 = fdip; 2193 hammer2_inode_t *ip2 = tdip; 2194 hammer2_inode_t *ip3 = ip; 2195 hammer2_inode_t *ip4 = tip; /* may be NULL */ 2196 2197 if (fdip > tdip) { 2198 ip1 = tdip; 2199 ip2 = fdip; 2200 } 2201 if (tip && ip > tip) { 2202 ip3 = tip; 2203 ip4 = ip; 2204 } 2205 hammer2_inode_lock4(ip1, ip2, ip3, ip4); 2206 } 2207 2208 /* 2209 * Resolve the collision space for (tdip, tname, tname_len) 2210 * 2211 * tdip must be held exclusively locked to prevent races since 2212 * multiple filenames can end up in the same collision space. 2213 */ 2214 { 2215 hammer2_xop_scanlhc_t *sxop; 2216 hammer2_tid_t lhcbase; 2217 2218 tlhc = hammer2_dirhash(tname, tname_len); 2219 lhcbase = tlhc; 2220 sxop = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING); 2221 sxop->lhc = tlhc; 2222 hammer2_xop_start(&sxop->head, &hammer2_scanlhc_desc); 2223 while ((error = hammer2_xop_collect(&sxop->head, 0)) == 0) { 2224 if (tlhc != sxop->head.cluster.focus->bref.key) 2225 break; 2226 ++tlhc; 2227 } 2228 error = hammer2_error_to_errno(error); 2229 hammer2_xop_retire(&sxop->head, HAMMER2_XOPMASK_VOP); 2230 2231 if (error) { 2232 if (error != ENOENT) 2233 goto done2; 2234 ++tlhc; 2235 error = 0; 2236 } 2237 if ((lhcbase ^ tlhc) & ~HAMMER2_DIRHASH_LOMASK) { 2238 error = ENOSPC; 2239 goto done2; 2240 } 2241 } 2242 2243 /* 2244 * Ready to go, issue the rename to the backend. Note that meta-data 2245 * updates to the related inodes occur separately from the rename 2246 * operation. 2247 * 2248 * NOTE: While it is not necessary to update ip->meta.name*, doing 2249 * so aids catastrophic recovery and debugging. 2250 */ 2251 if (error == 0) { 2252 hammer2_xop_nrename_t *xop4; 2253 2254 xop4 = hammer2_xop_alloc(fdip, HAMMER2_XOP_MODIFYING); 2255 xop4->lhc = tlhc; 2256 xop4->ip_key = ip->meta.name_key; 2257 hammer2_xop_setip2(&xop4->head, ip); 2258 hammer2_xop_setip3(&xop4->head, tdip); 2259 hammer2_xop_setname(&xop4->head, fname, fname_len); 2260 hammer2_xop_setname2(&xop4->head, tname, tname_len); 2261 hammer2_xop_start(&xop4->head, &hammer2_nrename_desc); 2262 2263 error = hammer2_xop_collect(&xop4->head, 0); 2264 error = hammer2_error_to_errno(error); 2265 hammer2_xop_retire(&xop4->head, HAMMER2_XOPMASK_VOP); 2266 2267 if (error == ENOENT) 2268 error = 0; 2269 2270 /* 2271 * Update inode meta-data. 2272 * 2273 * WARNING! The in-memory inode (ip) structure does not 2274 * maintain a copy of the inode's filename buffer. 2275 */ 2276 if (error == 0 && 2277 (ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE)) { 2278 hammer2_inode_modify(ip); 2279 ip->meta.name_len = tname_len; 2280 ip->meta.name_key = tlhc; 2281 } 2282 if (error == 0) { 2283 hammer2_inode_modify(ip); 2284 ip->meta.iparent = tdip->meta.inum; 2285 } 2286 update_fdip = 1; 2287 update_tdip = 1; 2288 } 2289 2290 done2: 2291 /* 2292 * If no error, the backend has replaced the target directory entry. 2293 * We must adjust nlinks on the original replace target if it exists. 2294 */ 2295 if (error == 0 && tip) { 2296 int isopen; 2297 2298 isopen = cache_isopen(ap->a_tnch); 2299 hammer2_inode_unlink_finisher(tip, isopen); 2300 } 2301 2302 /* 2303 * Update directory mtimes to represent the something changed. 2304 */ 2305 if (update_fdip || update_tdip) { 2306 uint64_t mtime; 2307 2308 hammer2_update_time(&mtime); 2309 if (update_fdip) { 2310 hammer2_inode_modify(fdip); 2311 fdip->meta.mtime = mtime; 2312 } 2313 if (update_tdip) { 2314 hammer2_inode_modify(tdip); 2315 tdip->meta.mtime = mtime; 2316 } 2317 } 2318 if (tip) { 2319 hammer2_inode_unlock(tip); 2320 hammer2_inode_drop(tip); 2321 } 2322 hammer2_inode_unlock(ip); 2323 hammer2_inode_unlock(tdip); 2324 hammer2_inode_unlock(fdip); 2325 hammer2_inode_drop(ip); 2326 hammer2_trans_done(tdip->pmp, HAMMER2_TRANS_SIDEQ); 2327 2328 /* 2329 * Issue the namecache update after unlocking all the internal 2330 * hammer2 structures, otherwise we might deadlock. 2331 * 2332 * WARNING! The target namespace must be updated atomically, 2333 * and we depend on cache_rename() to handle that for 2334 * us. Do not do a separate cache_unlink() because 2335 * that leaves a small window of opportunity for other 2336 * threads to allocate the target namespace before we 2337 * manage to complete our rename. 2338 * 2339 * WARNING! cache_rename() (and cache_unlink()) will properly 2340 * set VREF_FINALIZE on any attached vnode. Do not 2341 * call cache_setunresolved() manually before-hand as 2342 * this will prevent the flag from being set later via 2343 * cache_rename(). If VREF_FINALIZE is not properly set 2344 * and the inode is no longer in the topology, related 2345 * chains can remain dirty indefinitely. 2346 */ 2347 if (error == 0 && tip) { 2348 /*cache_unlink(ap->a_tnch); see above */ 2349 /*cache_setunresolved(ap->a_tnch); see above */ 2350 } 2351 if (error == 0) { 2352 cache_rename(ap->a_fnch, ap->a_tnch); 2353 hammer2_knote(ap->a_fdvp, NOTE_WRITE); 2354 hammer2_knote(ap->a_tdvp, NOTE_WRITE); 2355 hammer2_knote(fncp->nc_vp, NOTE_RENAME); 2356 } 2357 2358 return (error); 2359 } 2360 2361 /* 2362 * hammer2_vop_ioctl { vp, command, data, fflag, cred } 2363 */ 2364 static 2365 int 2366 hammer2_vop_ioctl(struct vop_ioctl_args *ap) 2367 { 2368 hammer2_inode_t *ip; 2369 int error; 2370 2371 ip = VTOI(ap->a_vp); 2372 2373 error = hammer2_ioctl(ip, ap->a_command, (void *)ap->a_data, 2374 ap->a_fflag, ap->a_cred); 2375 return (error); 2376 } 2377 2378 static 2379 int 2380 hammer2_vop_mountctl(struct vop_mountctl_args *ap) 2381 { 2382 struct mount *mp; 2383 hammer2_pfs_t *pmp; 2384 int rc; 2385 2386 switch (ap->a_op) { 2387 case (MOUNTCTL_SET_EXPORT): 2388 mp = ap->a_head.a_ops->head.vv_mount; 2389 pmp = MPTOPMP(mp); 2390 2391 if (ap->a_ctllen != sizeof(struct export_args)) 2392 rc = (EINVAL); 2393 else 2394 rc = vfs_export(mp, &pmp->export, 2395 (const struct export_args *)ap->a_ctl); 2396 break; 2397 default: 2398 rc = vop_stdmountctl(ap); 2399 break; 2400 } 2401 return (rc); 2402 } 2403 2404 /* 2405 * KQFILTER 2406 */ 2407 static void filt_hammer2detach(struct knote *kn); 2408 static int filt_hammer2read(struct knote *kn, long hint); 2409 static int filt_hammer2write(struct knote *kn, long hint); 2410 static int filt_hammer2vnode(struct knote *kn, long hint); 2411 2412 static struct filterops hammer2read_filtops = 2413 { FILTEROP_ISFD | FILTEROP_MPSAFE, 2414 NULL, filt_hammer2detach, filt_hammer2read }; 2415 static struct filterops hammer2write_filtops = 2416 { FILTEROP_ISFD | FILTEROP_MPSAFE, 2417 NULL, filt_hammer2detach, filt_hammer2write }; 2418 static struct filterops hammer2vnode_filtops = 2419 { FILTEROP_ISFD | FILTEROP_MPSAFE, 2420 NULL, filt_hammer2detach, filt_hammer2vnode }; 2421 2422 static 2423 int 2424 hammer2_vop_kqfilter(struct vop_kqfilter_args *ap) 2425 { 2426 struct vnode *vp = ap->a_vp; 2427 struct knote *kn = ap->a_kn; 2428 2429 switch (kn->kn_filter) { 2430 case EVFILT_READ: 2431 kn->kn_fop = &hammer2read_filtops; 2432 break; 2433 case EVFILT_WRITE: 2434 kn->kn_fop = &hammer2write_filtops; 2435 break; 2436 case EVFILT_VNODE: 2437 kn->kn_fop = &hammer2vnode_filtops; 2438 break; 2439 default: 2440 return (EOPNOTSUPP); 2441 } 2442 2443 kn->kn_hook = (caddr_t)vp; 2444 2445 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 2446 2447 return(0); 2448 } 2449 2450 static void 2451 filt_hammer2detach(struct knote *kn) 2452 { 2453 struct vnode *vp = (void *)kn->kn_hook; 2454 2455 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 2456 } 2457 2458 static int 2459 filt_hammer2read(struct knote *kn, long hint) 2460 { 2461 struct vnode *vp = (void *)kn->kn_hook; 2462 hammer2_inode_t *ip = VTOI(vp); 2463 off_t off; 2464 2465 if (hint == NOTE_REVOKE) { 2466 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 2467 return(1); 2468 } 2469 off = ip->meta.size - kn->kn_fp->f_offset; 2470 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 2471 if (kn->kn_sfflags & NOTE_OLDAPI) 2472 return(1); 2473 return (kn->kn_data != 0); 2474 } 2475 2476 2477 static int 2478 filt_hammer2write(struct knote *kn, long hint) 2479 { 2480 if (hint == NOTE_REVOKE) 2481 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 2482 kn->kn_data = 0; 2483 return (1); 2484 } 2485 2486 static int 2487 filt_hammer2vnode(struct knote *kn, long hint) 2488 { 2489 if (kn->kn_sfflags & hint) 2490 kn->kn_fflags |= hint; 2491 if (hint == NOTE_REVOKE) { 2492 kn->kn_flags |= (EV_EOF | EV_NODATA); 2493 return (1); 2494 } 2495 return (kn->kn_fflags != 0); 2496 } 2497 2498 /* 2499 * FIFO VOPS 2500 */ 2501 static 2502 int 2503 hammer2_vop_markatime(struct vop_markatime_args *ap) 2504 { 2505 hammer2_inode_t *ip; 2506 struct vnode *vp; 2507 2508 vp = ap->a_vp; 2509 ip = VTOI(vp); 2510 2511 if (ip->pmp->ronly || (ip->pmp->flags & HAMMER2_PMPF_EMERG)) 2512 return (EROFS); 2513 return(0); 2514 } 2515 2516 static 2517 int 2518 hammer2_vop_fifokqfilter(struct vop_kqfilter_args *ap) 2519 { 2520 int error; 2521 2522 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 2523 if (error) 2524 error = hammer2_vop_kqfilter(ap); 2525 return(error); 2526 } 2527 2528 /* 2529 * VOPS vector 2530 */ 2531 struct vop_ops hammer2_vnode_vops = { 2532 .vop_default = vop_defaultop, 2533 .vop_fsync = hammer2_vop_fsync, 2534 .vop_getpages = vop_stdgetpages, 2535 .vop_putpages = vop_stdputpages, 2536 .vop_access = hammer2_vop_access, 2537 .vop_advlock = hammer2_vop_advlock, 2538 .vop_close = hammer2_vop_close, 2539 .vop_nlink = hammer2_vop_nlink, 2540 .vop_ncreate = hammer2_vop_ncreate, 2541 .vop_nsymlink = hammer2_vop_nsymlink, 2542 .vop_nremove = hammer2_vop_nremove, 2543 .vop_nrmdir = hammer2_vop_nrmdir, 2544 .vop_nrename = hammer2_vop_nrename, 2545 .vop_getattr = hammer2_vop_getattr, 2546 .vop_getattr_lite = hammer2_vop_getattr_lite, 2547 .vop_setattr = hammer2_vop_setattr, 2548 .vop_readdir = hammer2_vop_readdir, 2549 .vop_readlink = hammer2_vop_readlink, 2550 .vop_read = hammer2_vop_read, 2551 .vop_write = hammer2_vop_write, 2552 .vop_open = hammer2_vop_open, 2553 .vop_inactive = hammer2_vop_inactive, 2554 .vop_reclaim = hammer2_vop_reclaim, 2555 .vop_nresolve = hammer2_vop_nresolve, 2556 .vop_nlookupdotdot = hammer2_vop_nlookupdotdot, 2557 .vop_nmkdir = hammer2_vop_nmkdir, 2558 .vop_nmknod = hammer2_vop_nmknod, 2559 .vop_ioctl = hammer2_vop_ioctl, 2560 .vop_mountctl = hammer2_vop_mountctl, 2561 .vop_bmap = hammer2_vop_bmap, 2562 .vop_strategy = hammer2_vop_strategy, 2563 .vop_kqfilter = hammer2_vop_kqfilter 2564 }; 2565 2566 struct vop_ops hammer2_spec_vops = { 2567 .vop_default = vop_defaultop, 2568 .vop_fsync = hammer2_vop_fsync, 2569 .vop_read = vop_stdnoread, 2570 .vop_write = vop_stdnowrite, 2571 .vop_access = hammer2_vop_access, 2572 .vop_close = hammer2_vop_close, 2573 .vop_markatime = hammer2_vop_markatime, 2574 .vop_getattr = hammer2_vop_getattr, 2575 .vop_inactive = hammer2_vop_inactive, 2576 .vop_reclaim = hammer2_vop_reclaim, 2577 .vop_setattr = hammer2_vop_setattr 2578 }; 2579 2580 struct vop_ops hammer2_fifo_vops = { 2581 .vop_default = fifo_vnoperate, 2582 .vop_fsync = hammer2_vop_fsync, 2583 #if 0 2584 .vop_read = hammer2_vop_fiforead, 2585 .vop_write = hammer2_vop_fifowrite, 2586 #endif 2587 .vop_access = hammer2_vop_access, 2588 #if 0 2589 .vop_close = hammer2_vop_fifoclose, 2590 #endif 2591 .vop_markatime = hammer2_vop_markatime, 2592 .vop_getattr = hammer2_vop_getattr, 2593 .vop_inactive = hammer2_vop_inactive, 2594 .vop_reclaim = hammer2_vop_reclaim, 2595 .vop_setattr = hammer2_vop_setattr, 2596 .vop_kqfilter = hammer2_vop_fifokqfilter 2597 }; 2598 2599