1 /* 2 * Copyright (c) 2011-2015 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@dragonflybsd.org> 6 * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org> 7 * by Daniel Flores (GSOC 2013 - mentored by Matthew Dillon, compression) 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 3. Neither the name of The DragonFly Project nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific, prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 26 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 27 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 29 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 30 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 31 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 33 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 /* 37 * Kernel Filesystem interface 38 * 39 * NOTE! local ipdata pointers must be reloaded on any modifying operation 40 * to the inode as its underlying chain may have changed. 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/kernel.h> 46 #include <sys/fcntl.h> 47 #include <sys/buf.h> 48 #include <sys/proc.h> 49 #include <sys/namei.h> 50 #include <sys/mount.h> 51 #include <sys/vnode.h> 52 #include <sys/mountctl.h> 53 #include <sys/dirent.h> 54 #include <sys/uio.h> 55 #include <sys/objcache.h> 56 #include <sys/event.h> 57 #include <sys/file.h> 58 #include <vfs/fifofs/fifo.h> 59 60 #include "hammer2.h" 61 62 static int hammer2_read_file(hammer2_inode_t *ip, struct uio *uio, 63 int seqcount); 64 static int hammer2_write_file(hammer2_inode_t *ip, struct uio *uio, 65 int ioflag, int seqcount); 66 static void hammer2_extend_file(hammer2_inode_t *ip, hammer2_key_t nsize); 67 static void hammer2_truncate_file(hammer2_inode_t *ip, hammer2_key_t nsize); 68 69 struct objcache *cache_xops; 70 71 static __inline 72 void 73 hammer2_knote(struct vnode *vp, int flags) 74 { 75 if (flags) 76 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags); 77 } 78 79 /* 80 * Last reference to a vnode is going away but it is still cached. 81 */ 82 static 83 int 84 hammer2_vop_inactive(struct vop_inactive_args *ap) 85 { 86 hammer2_inode_t *ip; 87 struct vnode *vp; 88 89 vp = ap->a_vp; 90 ip = VTOI(vp); 91 92 /* 93 * Degenerate case 94 */ 95 if (ip == NULL) { 96 vrecycle(vp); 97 return (0); 98 } 99 100 /* 101 * Check for deleted inodes and recycle immediately on the last 102 * release. Be sure to destroy any left-over buffer cache buffers 103 * so we do not waste time trying to flush them. 104 * 105 * Note that deleting the file block chains under the inode chain 106 * would just be a waste of energy, so don't do it. 107 * 108 * WARNING: nvtruncbuf() can only be safely called without the inode 109 * lock held due to the way our write thread works. 110 */ 111 if (ip->flags & HAMMER2_INODE_ISUNLINKED) { 112 hammer2_key_t lbase; 113 int nblksize; 114 115 /* 116 * Detect updates to the embedded data which may be 117 * synchronized by the strategy code. Simply mark the 118 * inode modified so it gets picked up by our normal flush. 119 */ 120 nblksize = hammer2_calc_logical(ip, 0, &lbase, NULL); 121 nvtruncbuf(vp, 0, nblksize, 0, 0); 122 vrecycle(vp); 123 } 124 return (0); 125 } 126 127 /* 128 * Reclaim a vnode so that it can be reused; after the inode is 129 * disassociated, the filesystem must manage it alone. 130 */ 131 static 132 int 133 hammer2_vop_reclaim(struct vop_reclaim_args *ap) 134 { 135 hammer2_inode_t *ip; 136 hammer2_pfs_t *pmp; 137 struct vnode *vp; 138 139 vp = ap->a_vp; 140 ip = VTOI(vp); 141 if (ip == NULL) { 142 return(0); 143 } 144 pmp = ip->pmp; 145 146 /* 147 * The final close of a deleted file or directory marks it for 148 * destruction. The DELETED flag allows the flusher to shortcut 149 * any modified blocks still unflushed (that is, just ignore them). 150 * 151 * HAMMER2 usually does not try to optimize the freemap by returning 152 * deleted blocks to it as it does not usually know how many snapshots 153 * might be referencing portions of the file/dir. 154 */ 155 vp->v_data = NULL; 156 ip->vp = NULL; 157 158 /* 159 * NOTE! We do not attempt to flush chains here, flushing is 160 * really fragile and could also deadlock. 161 */ 162 vclrisdirty(vp); 163 164 /* 165 * A modified inode may require chain synchronization. This 166 * synchronization is usually handled by VOP_SNYC / VOP_FSYNC 167 * when vfsync() is called. However, that requires a vnode. 168 * 169 * When the vnode is disassociated we must keep track of any modified 170 * inode via the sideq so that it is properly flushed. We cannot 171 * safely synchronize the inode from inside the reclaim due to 172 * potentially deep locks held as-of when the reclaim occurs. 173 * Interactions and potential deadlocks abound. 174 */ 175 if ((ip->flags & (HAMMER2_INODE_ISUNLINKED | 176 HAMMER2_INODE_MODIFIED | 177 HAMMER2_INODE_RESIZED)) && 178 (ip->flags & HAMMER2_INODE_ISDELETED) == 0) { 179 hammer2_inode_sideq_t *ipul; 180 181 ipul = kmalloc(sizeof(*ipul), pmp->minode, M_WAITOK | M_ZERO); 182 ipul->ip = ip; 183 184 hammer2_spin_ex(&pmp->list_spin); 185 if ((ip->flags & HAMMER2_INODE_ONSIDEQ) == 0) { 186 /* ref -> sideq */ 187 atomic_set_int(&ip->flags, HAMMER2_INODE_ONSIDEQ); 188 TAILQ_INSERT_TAIL(&pmp->sideq, ipul, entry); 189 ++pmp->sideq_count; 190 hammer2_spin_unex(&pmp->list_spin); 191 } else { 192 hammer2_spin_unex(&pmp->list_spin); 193 kfree(ipul, pmp->minode); 194 hammer2_inode_drop(ip); /* vp ref */ 195 } 196 /* retain ref from vp for ipul */ 197 } else { 198 hammer2_inode_drop(ip); /* vp ref */ 199 } 200 201 /* 202 * XXX handle background sync when ip dirty, kernel will no longer 203 * notify us regarding this inode because there is no longer a 204 * vnode attached to it. 205 */ 206 207 return (0); 208 } 209 210 static 211 int 212 hammer2_vop_fsync(struct vop_fsync_args *ap) 213 { 214 hammer2_inode_t *ip; 215 struct vnode *vp; 216 217 vp = ap->a_vp; 218 ip = VTOI(vp); 219 220 #if 0 221 /* XXX can't do this yet */ 222 hammer2_trans_init(ip->pmp, HAMMER2_TRANS_ISFLUSH); 223 vfsync(vp, ap->a_waitfor, 1, NULL, NULL); 224 #endif 225 hammer2_trans_init(ip->pmp, 0); 226 vfsync(vp, ap->a_waitfor, 1, NULL, NULL); 227 228 /* 229 * Calling chain_flush here creates a lot of duplicative 230 * COW operations due to non-optimal vnode ordering. 231 * 232 * Only do it for an actual fsync() syscall. The other forms 233 * which call this function will eventually call chain_flush 234 * on the volume root as a catch-all, which is far more optimal. 235 */ 236 hammer2_inode_lock(ip, 0); 237 if (ip->flags & HAMMER2_INODE_MODIFIED) 238 hammer2_inode_chain_sync(ip); 239 hammer2_inode_unlock(ip); 240 hammer2_trans_done(ip->pmp); 241 242 return (0); 243 } 244 245 static 246 int 247 hammer2_vop_access(struct vop_access_args *ap) 248 { 249 hammer2_inode_t *ip = VTOI(ap->a_vp); 250 uid_t uid; 251 gid_t gid; 252 int error; 253 254 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED); 255 uid = hammer2_to_unix_xid(&ip->meta.uid); 256 gid = hammer2_to_unix_xid(&ip->meta.gid); 257 error = vop_helper_access(ap, uid, gid, ip->meta.mode, ip->meta.uflags); 258 hammer2_inode_unlock(ip); 259 260 return (error); 261 } 262 263 static 264 int 265 hammer2_vop_getattr(struct vop_getattr_args *ap) 266 { 267 hammer2_pfs_t *pmp; 268 hammer2_inode_t *ip; 269 struct vnode *vp; 270 struct vattr *vap; 271 hammer2_chain_t *chain; 272 int i; 273 274 vp = ap->a_vp; 275 vap = ap->a_vap; 276 277 ip = VTOI(vp); 278 pmp = ip->pmp; 279 280 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED); 281 282 vap->va_fsid = pmp->mp->mnt_stat.f_fsid.val[0]; 283 vap->va_fileid = ip->meta.inum; 284 vap->va_mode = ip->meta.mode; 285 vap->va_nlink = ip->meta.nlinks; 286 vap->va_uid = hammer2_to_unix_xid(&ip->meta.uid); 287 vap->va_gid = hammer2_to_unix_xid(&ip->meta.gid); 288 vap->va_rmajor = 0; 289 vap->va_rminor = 0; 290 vap->va_size = ip->meta.size; /* protected by shared lock */ 291 vap->va_blocksize = HAMMER2_PBUFSIZE; 292 vap->va_flags = ip->meta.uflags; 293 hammer2_time_to_timespec(ip->meta.ctime, &vap->va_ctime); 294 hammer2_time_to_timespec(ip->meta.mtime, &vap->va_mtime); 295 hammer2_time_to_timespec(ip->meta.mtime, &vap->va_atime); 296 vap->va_gen = 1; 297 vap->va_bytes = 0; 298 if (ip->meta.type == HAMMER2_OBJTYPE_DIRECTORY) { 299 /* 300 * Can't really calculate directory use sans the files under 301 * it, just assume one block for now. 302 */ 303 vap->va_bytes += HAMMER2_INODE_BYTES; 304 } else { 305 for (i = 0; i < ip->cluster.nchains; ++i) { 306 if ((chain = ip->cluster.array[i].chain) != NULL) { 307 if (vap->va_bytes < 308 chain->bref.embed.stats.data_count) { 309 vap->va_bytes = 310 chain->bref.embed.stats.data_count; 311 } 312 } 313 } 314 } 315 vap->va_type = hammer2_get_vtype(ip->meta.type); 316 vap->va_filerev = 0; 317 vap->va_uid_uuid = ip->meta.uid; 318 vap->va_gid_uuid = ip->meta.gid; 319 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID | 320 VA_FSID_UUID_VALID; 321 322 hammer2_inode_unlock(ip); 323 324 return (0); 325 } 326 327 static 328 int 329 hammer2_vop_setattr(struct vop_setattr_args *ap) 330 { 331 hammer2_inode_t *ip; 332 struct vnode *vp; 333 struct vattr *vap; 334 int error; 335 int kflags = 0; 336 uint64_t ctime; 337 338 vp = ap->a_vp; 339 vap = ap->a_vap; 340 hammer2_update_time(&ctime); 341 342 ip = VTOI(vp); 343 344 if (ip->pmp->ronly) 345 return (EROFS); 346 if (hammer2_vfs_enospace(ip, 0, ap->a_cred) > 1) 347 return (ENOSPC); 348 349 hammer2_pfs_memory_wait(ip->pmp); 350 hammer2_trans_init(ip->pmp, 0); 351 hammer2_inode_lock(ip, 0); 352 error = 0; 353 354 if (vap->va_flags != VNOVAL) { 355 uint32_t flags; 356 357 flags = ip->meta.uflags; 358 error = vop_helper_setattr_flags(&flags, vap->va_flags, 359 hammer2_to_unix_xid(&ip->meta.uid), 360 ap->a_cred); 361 if (error == 0) { 362 if (ip->meta.uflags != flags) { 363 hammer2_inode_modify(ip); 364 ip->meta.uflags = flags; 365 ip->meta.ctime = ctime; 366 kflags |= NOTE_ATTRIB; 367 } 368 if (ip->meta.uflags & (IMMUTABLE | APPEND)) { 369 error = 0; 370 goto done; 371 } 372 } 373 goto done; 374 } 375 if (ip->meta.uflags & (IMMUTABLE | APPEND)) { 376 error = EPERM; 377 goto done; 378 } 379 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 380 mode_t cur_mode = ip->meta.mode; 381 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid); 382 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid); 383 uuid_t uuid_uid; 384 uuid_t uuid_gid; 385 386 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid, 387 ap->a_cred, 388 &cur_uid, &cur_gid, &cur_mode); 389 if (error == 0) { 390 hammer2_guid_to_uuid(&uuid_uid, cur_uid); 391 hammer2_guid_to_uuid(&uuid_gid, cur_gid); 392 if (bcmp(&uuid_uid, &ip->meta.uid, sizeof(uuid_uid)) || 393 bcmp(&uuid_gid, &ip->meta.gid, sizeof(uuid_gid)) || 394 ip->meta.mode != cur_mode 395 ) { 396 hammer2_inode_modify(ip); 397 ip->meta.uid = uuid_uid; 398 ip->meta.gid = uuid_gid; 399 ip->meta.mode = cur_mode; 400 ip->meta.ctime = ctime; 401 } 402 kflags |= NOTE_ATTRIB; 403 } 404 } 405 406 /* 407 * Resize the file 408 */ 409 if (vap->va_size != VNOVAL && ip->meta.size != vap->va_size) { 410 switch(vp->v_type) { 411 case VREG: 412 if (vap->va_size == ip->meta.size) 413 break; 414 if (vap->va_size < ip->meta.size) { 415 hammer2_mtx_ex(&ip->truncate_lock); 416 hammer2_truncate_file(ip, vap->va_size); 417 hammer2_mtx_unlock(&ip->truncate_lock); 418 kflags |= NOTE_WRITE; 419 } else { 420 hammer2_extend_file(ip, vap->va_size); 421 kflags |= NOTE_WRITE | NOTE_EXTEND; 422 } 423 hammer2_inode_modify(ip); 424 ip->meta.mtime = ctime; 425 break; 426 default: 427 error = EINVAL; 428 goto done; 429 } 430 } 431 #if 0 432 /* atime not supported */ 433 if (vap->va_atime.tv_sec != VNOVAL) { 434 hammer2_inode_modify(ip); 435 ip->meta.atime = hammer2_timespec_to_time(&vap->va_atime); 436 kflags |= NOTE_ATTRIB; 437 } 438 #endif 439 if (vap->va_mode != (mode_t)VNOVAL) { 440 mode_t cur_mode = ip->meta.mode; 441 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid); 442 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid); 443 444 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred, 445 cur_uid, cur_gid, &cur_mode); 446 if (error == 0 && ip->meta.mode != cur_mode) { 447 hammer2_inode_modify(ip); 448 ip->meta.mode = cur_mode; 449 ip->meta.ctime = ctime; 450 kflags |= NOTE_ATTRIB; 451 } 452 } 453 454 if (vap->va_mtime.tv_sec != VNOVAL) { 455 hammer2_inode_modify(ip); 456 ip->meta.mtime = hammer2_timespec_to_time(&vap->va_mtime); 457 kflags |= NOTE_ATTRIB; 458 } 459 460 done: 461 /* 462 * If a truncation occurred we must call inode_fsync() now in order 463 * to trim the related data chains, otherwise a later expansion can 464 * cause havoc. 465 * 466 * If an extend occured that changed the DIRECTDATA state, we must 467 * call inode_fsync now in order to prepare the inode's indirect 468 * block table. 469 */ 470 if (ip->flags & HAMMER2_INODE_RESIZED) 471 hammer2_inode_chain_sync(ip); 472 473 /* 474 * Cleanup. 475 */ 476 hammer2_inode_unlock(ip); 477 hammer2_trans_done(ip->pmp); 478 hammer2_knote(ip->vp, kflags); 479 480 return (error); 481 } 482 483 static 484 int 485 hammer2_vop_readdir(struct vop_readdir_args *ap) 486 { 487 hammer2_xop_readdir_t *xop; 488 hammer2_blockref_t bref; 489 hammer2_inode_t *ip; 490 hammer2_tid_t inum; 491 hammer2_key_t lkey; 492 struct uio *uio; 493 off_t *cookies; 494 off_t saveoff; 495 int cookie_index; 496 int ncookies; 497 int error; 498 int eofflag; 499 int r; 500 501 ip = VTOI(ap->a_vp); 502 uio = ap->a_uio; 503 saveoff = uio->uio_offset; 504 eofflag = 0; 505 error = 0; 506 507 /* 508 * Setup cookies directory entry cookies if requested 509 */ 510 if (ap->a_ncookies) { 511 ncookies = uio->uio_resid / 16 + 1; 512 if (ncookies > 1024) 513 ncookies = 1024; 514 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 515 } else { 516 ncookies = -1; 517 cookies = NULL; 518 } 519 cookie_index = 0; 520 521 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED); 522 523 /* 524 * Handle artificial entries. To ensure that only positive 64 bit 525 * quantities are returned to userland we always strip off bit 63. 526 * The hash code is designed such that codes 0x0000-0x7FFF are not 527 * used, allowing us to use these codes for articial entries. 528 * 529 * Entry 0 is used for '.' and entry 1 is used for '..'. Do not 530 * allow '..' to cross the mount point into (e.g.) the super-root. 531 */ 532 if (saveoff == 0) { 533 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK; 534 r = vop_write_dirent(&error, uio, inum, DT_DIR, 1, "."); 535 if (r) 536 goto done; 537 if (cookies) 538 cookies[cookie_index] = saveoff; 539 ++saveoff; 540 ++cookie_index; 541 if (cookie_index == ncookies) 542 goto done; 543 } 544 545 if (saveoff == 1) { 546 /* 547 * Be careful with lockorder when accessing ".." 548 * 549 * (ip is the current dir. xip is the parent dir). 550 */ 551 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK; 552 if (ip != ip->pmp->iroot) 553 inum = ip->meta.iparent & HAMMER2_DIRHASH_USERMSK; 554 r = vop_write_dirent(&error, uio, inum, DT_DIR, 2, ".."); 555 if (r) 556 goto done; 557 if (cookies) 558 cookies[cookie_index] = saveoff; 559 ++saveoff; 560 ++cookie_index; 561 if (cookie_index == ncookies) 562 goto done; 563 } 564 565 lkey = saveoff | HAMMER2_DIRHASH_VISIBLE; 566 if (hammer2_debug & 0x0020) 567 kprintf("readdir: lkey %016jx\n", lkey); 568 if (error) 569 goto done; 570 571 /* 572 * Use XOP for cluster scan. 573 * 574 * parent is the inode cluster, already locked for us. Don't 575 * double lock shared locks as this will screw up upgrades. 576 */ 577 xop = hammer2_xop_alloc(ip, 0); 578 xop->lkey = lkey; 579 hammer2_xop_start(&xop->head, hammer2_xop_readdir); 580 581 for (;;) { 582 const hammer2_inode_data_t *ripdata; 583 const char *dname; 584 int dtype; 585 586 error = hammer2_xop_collect(&xop->head, 0); 587 error = hammer2_error_to_errno(error); 588 if (error) { 589 break; 590 } 591 if (cookie_index == ncookies) 592 break; 593 if (hammer2_debug & 0x0020) 594 kprintf("cluster chain %p %p\n", 595 xop->head.cluster.focus, 596 (xop->head.cluster.focus ? 597 xop->head.cluster.focus->data : (void *)-1)); 598 hammer2_cluster_bref(&xop->head.cluster, &bref); 599 600 if (bref.type == HAMMER2_BREF_TYPE_INODE) { 601 ripdata = 602 &hammer2_cluster_rdata(&xop->head.cluster)->ipdata; 603 dtype = hammer2_get_dtype(ripdata->meta.type); 604 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK; 605 r = vop_write_dirent(&error, uio, 606 ripdata->meta.inum & 607 HAMMER2_DIRHASH_USERMSK, 608 dtype, 609 ripdata->meta.name_len, 610 ripdata->filename); 611 if (r) 612 break; 613 if (cookies) 614 cookies[cookie_index] = saveoff; 615 ++cookie_index; 616 } else if (bref.type == HAMMER2_BREF_TYPE_DIRENT) { 617 dtype = hammer2_get_dtype(bref.embed.dirent.type); 618 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK; 619 if (bref.embed.dirent.namlen <= 620 sizeof(bref.check.buf)) { 621 dname = bref.check.buf; 622 } else { 623 dname = 624 hammer2_cluster_rdata(&xop->head.cluster)->buf; 625 } 626 r = vop_write_dirent(&error, uio, 627 bref.embed.dirent.inum, 628 dtype, 629 bref.embed.dirent.namlen, 630 dname); 631 if (r) 632 break; 633 if (cookies) 634 cookies[cookie_index] = saveoff; 635 ++cookie_index; 636 } else { 637 /* XXX chain error */ 638 kprintf("bad chain type readdir %d\n", bref.type); 639 } 640 } 641 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 642 if (error == ENOENT) { 643 error = 0; 644 eofflag = 1; 645 saveoff = (hammer2_key_t)-1; 646 } else { 647 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK; 648 } 649 done: 650 hammer2_inode_unlock(ip); 651 if (ap->a_eofflag) 652 *ap->a_eofflag = eofflag; 653 if (hammer2_debug & 0x0020) 654 kprintf("readdir: done at %016jx\n", saveoff); 655 uio->uio_offset = saveoff & ~HAMMER2_DIRHASH_VISIBLE; 656 if (error && cookie_index == 0) { 657 if (cookies) { 658 kfree(cookies, M_TEMP); 659 *ap->a_ncookies = 0; 660 *ap->a_cookies = NULL; 661 } 662 } else { 663 if (cookies) { 664 *ap->a_ncookies = cookie_index; 665 *ap->a_cookies = cookies; 666 } 667 } 668 return (error); 669 } 670 671 /* 672 * hammer2_vop_readlink { vp, uio, cred } 673 */ 674 static 675 int 676 hammer2_vop_readlink(struct vop_readlink_args *ap) 677 { 678 struct vnode *vp; 679 hammer2_inode_t *ip; 680 int error; 681 682 vp = ap->a_vp; 683 if (vp->v_type != VLNK) 684 return (EINVAL); 685 ip = VTOI(vp); 686 687 error = hammer2_read_file(ip, ap->a_uio, 0); 688 return (error); 689 } 690 691 static 692 int 693 hammer2_vop_read(struct vop_read_args *ap) 694 { 695 struct vnode *vp; 696 hammer2_inode_t *ip; 697 struct uio *uio; 698 int error; 699 int seqcount; 700 int bigread; 701 702 /* 703 * Read operations supported on this vnode? 704 */ 705 vp = ap->a_vp; 706 if (vp->v_type != VREG) 707 return (EINVAL); 708 709 /* 710 * Misc 711 */ 712 ip = VTOI(vp); 713 uio = ap->a_uio; 714 error = 0; 715 716 seqcount = ap->a_ioflag >> 16; 717 bigread = (uio->uio_resid > 100 * 1024 * 1024); 718 719 error = hammer2_read_file(ip, uio, seqcount); 720 return (error); 721 } 722 723 static 724 int 725 hammer2_vop_write(struct vop_write_args *ap) 726 { 727 hammer2_inode_t *ip; 728 thread_t td; 729 struct vnode *vp; 730 struct uio *uio; 731 int error; 732 int seqcount; 733 int ioflag; 734 735 /* 736 * Read operations supported on this vnode? 737 */ 738 vp = ap->a_vp; 739 if (vp->v_type != VREG) 740 return (EINVAL); 741 742 /* 743 * Misc 744 */ 745 ip = VTOI(vp); 746 ioflag = ap->a_ioflag; 747 uio = ap->a_uio; 748 error = 0; 749 if (ip->pmp->ronly) 750 return (EROFS); 751 switch (hammer2_vfs_enospace(ip, uio->uio_resid, ap->a_cred)) { 752 case 2: 753 return (ENOSPC); 754 case 1: 755 ioflag |= IO_DIRECT; /* semi-synchronous */ 756 /* fall through */ 757 default: 758 break; 759 } 760 761 seqcount = ioflag >> 16; 762 763 /* 764 * Check resource limit 765 */ 766 if (uio->uio_resid > 0 && (td = uio->uio_td) != NULL && td->td_proc && 767 uio->uio_offset + uio->uio_resid > 768 td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 769 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ); 770 return (EFBIG); 771 } 772 773 /* 774 * The transaction interlocks against flush initiations 775 * (note: but will run concurrently with the actual flush). 776 * 777 * To avoid deadlocking against the VM system, we must flag any 778 * transaction related to the buffer cache or other direct 779 * VM page manipulation. 780 */ 781 if (uio->uio_segflg == UIO_NOCOPY) 782 hammer2_trans_init(ip->pmp, HAMMER2_TRANS_BUFCACHE); 783 else 784 hammer2_trans_init(ip->pmp, 0); 785 error = hammer2_write_file(ip, uio, ioflag, seqcount); 786 hammer2_trans_done(ip->pmp); 787 788 return (error); 789 } 790 791 /* 792 * Perform read operations on a file or symlink given an UNLOCKED 793 * inode and uio. 794 * 795 * The passed ip is not locked. 796 */ 797 static 798 int 799 hammer2_read_file(hammer2_inode_t *ip, struct uio *uio, int seqcount) 800 { 801 hammer2_off_t size; 802 struct buf *bp; 803 int error; 804 805 error = 0; 806 807 /* 808 * UIO read loop. 809 * 810 * WARNING! Assumes that the kernel interlocks size changes at the 811 * vnode level. 812 */ 813 hammer2_mtx_sh(&ip->lock); 814 hammer2_mtx_sh(&ip->truncate_lock); 815 size = ip->meta.size; 816 hammer2_mtx_unlock(&ip->lock); 817 818 while (uio->uio_resid > 0 && uio->uio_offset < size) { 819 hammer2_key_t lbase; 820 hammer2_key_t leof; 821 int lblksize; 822 int loff; 823 int n; 824 825 lblksize = hammer2_calc_logical(ip, uio->uio_offset, 826 &lbase, &leof); 827 828 #if 1 829 error = cluster_read(ip->vp, leof, lbase, lblksize, 830 uio->uio_resid, seqcount * MAXBSIZE, 831 &bp); 832 #else 833 if (uio->uio_segflg == UIO_NOCOPY) { 834 bp = getblk(ip->vp, lbase, lblksize, GETBLK_BHEAVY, 0); 835 if (bp->b_flags & B_CACHE) { 836 int i; 837 int j = 0; 838 if (bp->b_xio.xio_npages != 16) 839 kprintf("NPAGES BAD\n"); 840 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 841 vm_page_t m; 842 m = bp->b_xio.xio_pages[i]; 843 if (m == NULL || m->valid == 0) { 844 kprintf("bp %016jx %016jx pg %d inv", 845 lbase, leof, i); 846 if (m) 847 kprintf("m->object %p/%p", m->object, ip->vp->v_object); 848 kprintf("\n"); 849 j = 1; 850 } 851 } 852 if (j) 853 kprintf("b_flags %08x, b_error %d\n", bp->b_flags, bp->b_error); 854 } 855 bqrelse(bp); 856 } 857 error = bread(ip->vp, lbase, lblksize, &bp); 858 #endif 859 if (error) { 860 brelse(bp); 861 break; 862 } 863 loff = (int)(uio->uio_offset - lbase); 864 n = lblksize - loff; 865 if (n > uio->uio_resid) 866 n = uio->uio_resid; 867 if (n > size - uio->uio_offset) 868 n = (int)(size - uio->uio_offset); 869 bp->b_flags |= B_AGE; 870 uiomovebp(bp, (char *)bp->b_data + loff, n, uio); 871 bqrelse(bp); 872 } 873 hammer2_mtx_unlock(&ip->truncate_lock); 874 875 return (error); 876 } 877 878 /* 879 * Write to the file represented by the inode via the logical buffer cache. 880 * The inode may represent a regular file or a symlink. 881 * 882 * The inode must not be locked. 883 */ 884 static 885 int 886 hammer2_write_file(hammer2_inode_t *ip, struct uio *uio, 887 int ioflag, int seqcount) 888 { 889 hammer2_key_t old_eof; 890 hammer2_key_t new_eof; 891 struct buf *bp; 892 int kflags; 893 int error; 894 int modified; 895 896 /* 897 * Setup if append 898 * 899 * WARNING! Assumes that the kernel interlocks size changes at the 900 * vnode level. 901 */ 902 hammer2_mtx_ex(&ip->lock); 903 hammer2_mtx_sh(&ip->truncate_lock); 904 if (ioflag & IO_APPEND) 905 uio->uio_offset = ip->meta.size; 906 old_eof = ip->meta.size; 907 908 /* 909 * Extend the file if necessary. If the write fails at some point 910 * we will truncate it back down to cover as much as we were able 911 * to write. 912 * 913 * Doing this now makes it easier to calculate buffer sizes in 914 * the loop. 915 */ 916 kflags = 0; 917 error = 0; 918 modified = 0; 919 920 if (uio->uio_offset + uio->uio_resid > old_eof) { 921 new_eof = uio->uio_offset + uio->uio_resid; 922 modified = 1; 923 hammer2_extend_file(ip, new_eof); 924 kflags |= NOTE_EXTEND; 925 } else { 926 new_eof = old_eof; 927 } 928 hammer2_mtx_unlock(&ip->lock); 929 930 /* 931 * UIO write loop 932 */ 933 while (uio->uio_resid > 0) { 934 hammer2_key_t lbase; 935 int trivial; 936 int endofblk; 937 int lblksize; 938 int loff; 939 int n; 940 941 /* 942 * Don't allow the buffer build to blow out the buffer 943 * cache. 944 */ 945 if ((ioflag & IO_RECURSE) == 0) 946 bwillwrite(HAMMER2_PBUFSIZE); 947 948 /* 949 * This nominally tells us how much we can cluster and 950 * what the logical buffer size needs to be. Currently 951 * we don't try to cluster the write and just handle one 952 * block at a time. 953 */ 954 lblksize = hammer2_calc_logical(ip, uio->uio_offset, 955 &lbase, NULL); 956 loff = (int)(uio->uio_offset - lbase); 957 958 KKASSERT(lblksize <= 65536); 959 960 /* 961 * Calculate bytes to copy this transfer and whether the 962 * copy completely covers the buffer or not. 963 */ 964 trivial = 0; 965 n = lblksize - loff; 966 if (n > uio->uio_resid) { 967 n = uio->uio_resid; 968 if (loff == lbase && uio->uio_offset + n == new_eof) 969 trivial = 1; 970 endofblk = 0; 971 } else { 972 if (loff == 0) 973 trivial = 1; 974 endofblk = 1; 975 } 976 if (lbase >= new_eof) 977 trivial = 1; 978 979 /* 980 * Get the buffer 981 */ 982 if (uio->uio_segflg == UIO_NOCOPY) { 983 /* 984 * Issuing a write with the same data backing the 985 * buffer. Instantiate the buffer to collect the 986 * backing vm pages, then read-in any missing bits. 987 * 988 * This case is used by vop_stdputpages(). 989 */ 990 bp = getblk(ip->vp, lbase, lblksize, GETBLK_BHEAVY, 0); 991 if ((bp->b_flags & B_CACHE) == 0) { 992 bqrelse(bp); 993 error = bread(ip->vp, lbase, lblksize, &bp); 994 } 995 } else if (trivial) { 996 /* 997 * Even though we are entirely overwriting the buffer 998 * we may still have to zero it out to avoid a 999 * mmap/write visibility issue. 1000 */ 1001 bp = getblk(ip->vp, lbase, lblksize, GETBLK_BHEAVY, 0); 1002 if ((bp->b_flags & B_CACHE) == 0) 1003 vfs_bio_clrbuf(bp); 1004 } else { 1005 /* 1006 * Partial overwrite, read in any missing bits then 1007 * replace the portion being written. 1008 * 1009 * (The strategy code will detect zero-fill physical 1010 * blocks for this case). 1011 */ 1012 error = bread(ip->vp, lbase, lblksize, &bp); 1013 if (error == 0) 1014 bheavy(bp); 1015 } 1016 1017 if (error) { 1018 brelse(bp); 1019 break; 1020 } 1021 1022 /* 1023 * Ok, copy the data in 1024 */ 1025 error = uiomovebp(bp, bp->b_data + loff, n, uio); 1026 kflags |= NOTE_WRITE; 1027 modified = 1; 1028 if (error) { 1029 brelse(bp); 1030 break; 1031 } 1032 1033 /* 1034 * WARNING: Pageout daemon will issue UIO_NOCOPY writes 1035 * with IO_SYNC or IO_ASYNC set. These writes 1036 * must be handled as the pageout daemon expects. 1037 * 1038 * NOTE! H2 relies on cluster_write() here because it 1039 * cannot preallocate disk blocks at the logical 1040 * level due to not knowing what the compression 1041 * size will be at this time. 1042 * 1043 * We must use cluster_write() here and we depend 1044 * on the write-behind feature to flush buffers 1045 * appropriately. If we let the buffer daemons do 1046 * it the block allocations will be all over the 1047 * map. 1048 */ 1049 if (ioflag & IO_SYNC) { 1050 bwrite(bp); 1051 } else if ((ioflag & IO_DIRECT) && endofblk) { 1052 bawrite(bp); 1053 } else if (ioflag & IO_ASYNC) { 1054 bawrite(bp); 1055 } else if (ip->vp->v_mount->mnt_flag & MNT_NOCLUSTERW) { 1056 bdwrite(bp); 1057 } else { 1058 #if 1 1059 bp->b_flags |= B_CLUSTEROK; 1060 cluster_write(bp, new_eof, lblksize, seqcount); 1061 #else 1062 bp->b_flags |= B_CLUSTEROK; 1063 bdwrite(bp); 1064 #endif 1065 } 1066 } 1067 1068 /* 1069 * Cleanup. If we extended the file EOF but failed to write through 1070 * the entire write is a failure and we have to back-up. 1071 */ 1072 if (error && new_eof != old_eof) { 1073 hammer2_mtx_unlock(&ip->truncate_lock); 1074 hammer2_mtx_ex(&ip->lock); 1075 hammer2_mtx_ex(&ip->truncate_lock); 1076 hammer2_truncate_file(ip, old_eof); 1077 if (ip->flags & HAMMER2_INODE_MODIFIED) 1078 hammer2_inode_chain_sync(ip); 1079 hammer2_mtx_unlock(&ip->lock); 1080 } else if (modified) { 1081 hammer2_mtx_ex(&ip->lock); 1082 hammer2_inode_modify(ip); 1083 hammer2_update_time(&ip->meta.mtime); 1084 if (ip->flags & HAMMER2_INODE_MODIFIED) 1085 hammer2_inode_chain_sync(ip); 1086 hammer2_mtx_unlock(&ip->lock); 1087 hammer2_knote(ip->vp, kflags); 1088 } 1089 hammer2_trans_assert_strategy(ip->pmp); 1090 hammer2_mtx_unlock(&ip->truncate_lock); 1091 1092 return error; 1093 } 1094 1095 /* 1096 * Truncate the size of a file. The inode must not be locked. 1097 * 1098 * We must unconditionally set HAMMER2_INODE_RESIZED to properly 1099 * ensure that any on-media data beyond the new file EOF has been destroyed. 1100 * 1101 * WARNING: nvtruncbuf() can only be safely called without the inode lock 1102 * held due to the way our write thread works. If the truncation 1103 * occurs in the middle of a buffer, nvtruncbuf() is responsible 1104 * for dirtying that buffer and zeroing out trailing bytes. 1105 * 1106 * WARNING! Assumes that the kernel interlocks size changes at the 1107 * vnode level. 1108 * 1109 * WARNING! Caller assumes responsibility for removing dead blocks 1110 * if INODE_RESIZED is set. 1111 */ 1112 static 1113 void 1114 hammer2_truncate_file(hammer2_inode_t *ip, hammer2_key_t nsize) 1115 { 1116 hammer2_key_t lbase; 1117 int nblksize; 1118 1119 hammer2_mtx_unlock(&ip->lock); 1120 if (ip->vp) { 1121 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL); 1122 nvtruncbuf(ip->vp, nsize, 1123 nblksize, (int)nsize & (nblksize - 1), 1124 0); 1125 } 1126 hammer2_mtx_ex(&ip->lock); 1127 KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0); 1128 ip->osize = ip->meta.size; 1129 ip->meta.size = nsize; 1130 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED); 1131 hammer2_inode_modify(ip); 1132 } 1133 1134 /* 1135 * Extend the size of a file. The inode must not be locked. 1136 * 1137 * Even though the file size is changing, we do not have to set the 1138 * INODE_RESIZED bit unless the file size crosses the EMBEDDED_BYTES 1139 * boundary. When this occurs a hammer2_inode_chain_sync() is required 1140 * to prepare the inode cluster's indirect block table, otherwise 1141 * async execution of the strategy code will implode on us. 1142 * 1143 * WARNING! Assumes that the kernel interlocks size changes at the 1144 * vnode level. 1145 * 1146 * WARNING! Caller assumes responsibility for transitioning out 1147 * of the inode DIRECTDATA mode if INODE_RESIZED is set. 1148 */ 1149 static 1150 void 1151 hammer2_extend_file(hammer2_inode_t *ip, hammer2_key_t nsize) 1152 { 1153 hammer2_key_t lbase; 1154 hammer2_key_t osize; 1155 int oblksize; 1156 int nblksize; 1157 1158 KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0); 1159 hammer2_inode_modify(ip); 1160 osize = ip->meta.size; 1161 ip->osize = osize; 1162 ip->meta.size = nsize; 1163 1164 if (osize <= HAMMER2_EMBEDDED_BYTES && nsize > HAMMER2_EMBEDDED_BYTES) { 1165 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED); 1166 hammer2_inode_chain_sync(ip); 1167 } 1168 1169 hammer2_mtx_unlock(&ip->lock); 1170 if (ip->vp) { 1171 oblksize = hammer2_calc_logical(ip, osize, &lbase, NULL); 1172 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL); 1173 nvextendbuf(ip->vp, 1174 osize, nsize, 1175 oblksize, nblksize, 1176 -1, -1, 0); 1177 } 1178 hammer2_mtx_ex(&ip->lock); 1179 } 1180 1181 static 1182 int 1183 hammer2_vop_nresolve(struct vop_nresolve_args *ap) 1184 { 1185 hammer2_xop_nresolve_t *xop; 1186 hammer2_inode_t *ip; 1187 hammer2_inode_t *dip; 1188 struct namecache *ncp; 1189 struct vnode *vp; 1190 int error; 1191 1192 dip = VTOI(ap->a_dvp); 1193 xop = hammer2_xop_alloc(dip, 0); 1194 1195 ncp = ap->a_nch->ncp; 1196 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen); 1197 1198 /* 1199 * Note: In DragonFly the kernel handles '.' and '..'. 1200 */ 1201 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1202 hammer2_xop_start(&xop->head, hammer2_xop_nresolve); 1203 1204 error = hammer2_xop_collect(&xop->head, 0); 1205 error = hammer2_error_to_errno(error); 1206 if (error) { 1207 ip = NULL; 1208 } else { 1209 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1); 1210 } 1211 hammer2_inode_unlock(dip); 1212 1213 /* 1214 * Acquire the related vnode 1215 * 1216 * NOTE: For error processing, only ENOENT resolves the namecache 1217 * entry to NULL, otherwise we just return the error and 1218 * leave the namecache unresolved. 1219 * 1220 * NOTE: multiple hammer2_inode structures can be aliased to the 1221 * same chain element, for example for hardlinks. This 1222 * use case does not 'reattach' inode associations that 1223 * might already exist, but always allocates a new one. 1224 * 1225 * WARNING: inode structure is locked exclusively via inode_get 1226 * but chain was locked shared. inode_unlock() 1227 * will handle it properly. 1228 */ 1229 if (ip) { 1230 vp = hammer2_igetv(ip, &error); /* error set to UNIX error */ 1231 if (error == 0) { 1232 vn_unlock(vp); 1233 cache_setvp(ap->a_nch, vp); 1234 } else if (error == ENOENT) { 1235 cache_setvp(ap->a_nch, NULL); 1236 } 1237 hammer2_inode_unlock(ip); 1238 1239 /* 1240 * The vp should not be released until after we've disposed 1241 * of our locks, because it might cause vop_inactive() to 1242 * be called. 1243 */ 1244 if (vp) 1245 vrele(vp); 1246 } else { 1247 error = ENOENT; 1248 cache_setvp(ap->a_nch, NULL); 1249 } 1250 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1251 KASSERT(error || ap->a_nch->ncp->nc_vp != NULL, 1252 ("resolve error %d/%p ap %p\n", 1253 error, ap->a_nch->ncp->nc_vp, ap)); 1254 1255 return error; 1256 } 1257 1258 static 1259 int 1260 hammer2_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap) 1261 { 1262 hammer2_inode_t *dip; 1263 hammer2_tid_t inum; 1264 int error; 1265 1266 dip = VTOI(ap->a_dvp); 1267 inum = dip->meta.iparent; 1268 *ap->a_vpp = NULL; 1269 1270 if (inum) { 1271 error = hammer2_vfs_vget(ap->a_dvp->v_mount, NULL, 1272 inum, ap->a_vpp); 1273 } else { 1274 error = ENOENT; 1275 } 1276 return error; 1277 } 1278 1279 static 1280 int 1281 hammer2_vop_nmkdir(struct vop_nmkdir_args *ap) 1282 { 1283 hammer2_inode_t *dip; 1284 hammer2_inode_t *nip; 1285 struct namecache *ncp; 1286 const uint8_t *name; 1287 size_t name_len; 1288 hammer2_tid_t inum; 1289 int error; 1290 1291 dip = VTOI(ap->a_dvp); 1292 if (dip->pmp->ronly) 1293 return (EROFS); 1294 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1295 return (ENOSPC); 1296 1297 ncp = ap->a_nch->ncp; 1298 name = ncp->nc_name; 1299 name_len = ncp->nc_nlen; 1300 1301 hammer2_pfs_memory_wait(dip->pmp); 1302 hammer2_trans_init(dip->pmp, 0); 1303 1304 inum = hammer2_trans_newinum(dip->pmp); 1305 1306 /* 1307 * Create the actual inode as a hidden file in the iroot, then 1308 * create the directory entry. The creation of the actual inode 1309 * sets its nlinks to 1 which is the value we desire. 1310 */ 1311 nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred, 1312 NULL, 0, inum, 1313 inum, 0, 0, 1314 0, &error); 1315 if (error) { 1316 error = hammer2_error_to_errno(error); 1317 } else { 1318 error = hammer2_dirent_create(dip, name, name_len, 1319 nip->meta.inum, nip->meta.type); 1320 /* returns UNIX error code */ 1321 } 1322 if (error) { 1323 if (nip) { 1324 hammer2_inode_unlink_finisher(nip, 0); 1325 hammer2_inode_unlock(nip); 1326 nip = NULL; 1327 } 1328 *ap->a_vpp = NULL; 1329 } else { 1330 *ap->a_vpp = hammer2_igetv(nip, &error); 1331 hammer2_inode_unlock(nip); 1332 } 1333 1334 /* 1335 * Update dip's mtime 1336 * 1337 * We can use a shared inode lock and allow the meta.mtime update 1338 * SMP race. hammer2_inode_modify() is MPSAFE w/a shared lock. 1339 */ 1340 if (error == 0) { 1341 uint64_t mtime; 1342 1343 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1344 hammer2_update_time(&mtime); 1345 hammer2_inode_modify(dip); 1346 dip->meta.mtime = mtime; 1347 hammer2_inode_unlock(dip); 1348 } 1349 1350 hammer2_trans_done(dip->pmp); 1351 1352 if (error == 0) { 1353 cache_setunresolved(ap->a_nch); 1354 cache_setvp(ap->a_nch, *ap->a_vpp); 1355 hammer2_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1356 } 1357 return error; 1358 } 1359 1360 static 1361 int 1362 hammer2_vop_open(struct vop_open_args *ap) 1363 { 1364 return vop_stdopen(ap); 1365 } 1366 1367 /* 1368 * hammer2_vop_advlock { vp, id, op, fl, flags } 1369 */ 1370 static 1371 int 1372 hammer2_vop_advlock(struct vop_advlock_args *ap) 1373 { 1374 hammer2_inode_t *ip = VTOI(ap->a_vp); 1375 hammer2_off_t size; 1376 1377 size = ip->meta.size; 1378 return (lf_advlock(ap, &ip->advlock, size)); 1379 } 1380 1381 static 1382 int 1383 hammer2_vop_close(struct vop_close_args *ap) 1384 { 1385 return vop_stdclose(ap); 1386 } 1387 1388 /* 1389 * hammer2_vop_nlink { nch, dvp, vp, cred } 1390 * 1391 * Create a hardlink from (vp) to {dvp, nch}. 1392 */ 1393 static 1394 int 1395 hammer2_vop_nlink(struct vop_nlink_args *ap) 1396 { 1397 hammer2_inode_t *tdip; /* target directory to create link in */ 1398 hammer2_inode_t *ip; /* inode we are hardlinking to */ 1399 struct namecache *ncp; 1400 const uint8_t *name; 1401 size_t name_len; 1402 int error; 1403 1404 if (ap->a_dvp->v_mount != ap->a_vp->v_mount) 1405 return(EXDEV); 1406 1407 tdip = VTOI(ap->a_dvp); 1408 if (tdip->pmp->ronly) 1409 return (EROFS); 1410 if (hammer2_vfs_enospace(tdip, 0, ap->a_cred) > 1) 1411 return (ENOSPC); 1412 1413 ncp = ap->a_nch->ncp; 1414 name = ncp->nc_name; 1415 name_len = ncp->nc_nlen; 1416 1417 /* 1418 * ip represents the file being hardlinked. The file could be a 1419 * normal file or a hardlink target if it has already been hardlinked. 1420 * (with the new semantics, it will almost always be a hardlink 1421 * target). 1422 * 1423 * Bump nlinks and potentially also create or move the hardlink 1424 * target in the parent directory common to (ip) and (tdip). The 1425 * consolidation code can modify ip->cluster. The returned cluster 1426 * is locked. 1427 */ 1428 ip = VTOI(ap->a_vp); 1429 KASSERT(ip->pmp, ("ip->pmp is NULL %p %p", ip, ip->pmp)); 1430 hammer2_pfs_memory_wait(ip->pmp); 1431 hammer2_trans_init(ip->pmp, 0); 1432 1433 /* 1434 * Target should be an indexed inode or there's no way we will ever 1435 * be able to find it! 1436 */ 1437 KKASSERT((ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE) == 0); 1438 1439 error = 0; 1440 1441 /* 1442 * Can return NULL and error == EXDEV if the common parent 1443 * crosses a directory with the xlink flag set. 1444 */ 1445 hammer2_inode_lock(tdip, 0); 1446 hammer2_inode_lock(ip, 0); 1447 1448 /* 1449 * Create the directory entry and bump nlinks. 1450 */ 1451 if (error == 0) { 1452 error = hammer2_dirent_create(tdip, name, name_len, 1453 ip->meta.inum, ip->meta.type); 1454 hammer2_inode_modify(ip); 1455 ++ip->meta.nlinks; 1456 } 1457 if (error == 0) { 1458 /* 1459 * Update dip's mtime 1460 */ 1461 uint64_t mtime; 1462 1463 hammer2_update_time(&mtime); 1464 hammer2_inode_modify(tdip); 1465 tdip->meta.mtime = mtime; 1466 1467 cache_setunresolved(ap->a_nch); 1468 cache_setvp(ap->a_nch, ap->a_vp); 1469 } 1470 hammer2_inode_unlock(ip); 1471 hammer2_inode_unlock(tdip); 1472 1473 hammer2_trans_done(ip->pmp); 1474 hammer2_knote(ap->a_vp, NOTE_LINK); 1475 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1476 1477 return error; 1478 } 1479 1480 /* 1481 * hammer2_vop_ncreate { nch, dvp, vpp, cred, vap } 1482 * 1483 * The operating system has already ensured that the directory entry 1484 * does not exist and done all appropriate namespace locking. 1485 */ 1486 static 1487 int 1488 hammer2_vop_ncreate(struct vop_ncreate_args *ap) 1489 { 1490 hammer2_inode_t *dip; 1491 hammer2_inode_t *nip; 1492 struct namecache *ncp; 1493 const uint8_t *name; 1494 size_t name_len; 1495 hammer2_tid_t inum; 1496 int error; 1497 1498 dip = VTOI(ap->a_dvp); 1499 if (dip->pmp->ronly) 1500 return (EROFS); 1501 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1502 return (ENOSPC); 1503 1504 ncp = ap->a_nch->ncp; 1505 name = ncp->nc_name; 1506 name_len = ncp->nc_nlen; 1507 hammer2_pfs_memory_wait(dip->pmp); 1508 hammer2_trans_init(dip->pmp, 0); 1509 1510 inum = hammer2_trans_newinum(dip->pmp); 1511 1512 /* 1513 * Create the actual inode as a hidden file in the iroot, then 1514 * create the directory entry. The creation of the actual inode 1515 * sets its nlinks to 1 which is the value we desire. 1516 */ 1517 nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred, 1518 NULL, 0, inum, 1519 inum, 0, 0, 1520 0, &error); 1521 1522 if (error) { 1523 error = hammer2_error_to_errno(error); 1524 } else { 1525 error = hammer2_dirent_create(dip, name, name_len, 1526 nip->meta.inum, nip->meta.type); 1527 } 1528 if (error) { 1529 if (nip) { 1530 hammer2_inode_unlink_finisher(nip, 0); 1531 hammer2_inode_unlock(nip); 1532 nip = NULL; 1533 } 1534 *ap->a_vpp = NULL; 1535 } else { 1536 *ap->a_vpp = hammer2_igetv(nip, &error); 1537 hammer2_inode_unlock(nip); 1538 } 1539 1540 /* 1541 * Update dip's mtime 1542 */ 1543 if (error == 0) { 1544 uint64_t mtime; 1545 1546 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1547 hammer2_update_time(&mtime); 1548 hammer2_inode_modify(dip); 1549 dip->meta.mtime = mtime; 1550 hammer2_inode_unlock(dip); 1551 } 1552 1553 hammer2_trans_done(dip->pmp); 1554 1555 if (error == 0) { 1556 cache_setunresolved(ap->a_nch); 1557 cache_setvp(ap->a_nch, *ap->a_vpp); 1558 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1559 } 1560 return error; 1561 } 1562 1563 /* 1564 * Make a device node (typically a fifo) 1565 */ 1566 static 1567 int 1568 hammer2_vop_nmknod(struct vop_nmknod_args *ap) 1569 { 1570 hammer2_inode_t *dip; 1571 hammer2_inode_t *nip; 1572 struct namecache *ncp; 1573 const uint8_t *name; 1574 size_t name_len; 1575 hammer2_tid_t inum; 1576 int error; 1577 1578 dip = VTOI(ap->a_dvp); 1579 if (dip->pmp->ronly) 1580 return (EROFS); 1581 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1582 return (ENOSPC); 1583 1584 ncp = ap->a_nch->ncp; 1585 name = ncp->nc_name; 1586 name_len = ncp->nc_nlen; 1587 hammer2_pfs_memory_wait(dip->pmp); 1588 hammer2_trans_init(dip->pmp, 0); 1589 1590 /* 1591 * Create the device inode and then create the directory entry. 1592 */ 1593 inum = hammer2_trans_newinum(dip->pmp); 1594 nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred, 1595 NULL, 0, inum, 1596 inum, 0, 0, 1597 0, &error); 1598 if (error == 0) { 1599 error = hammer2_dirent_create(dip, name, name_len, 1600 nip->meta.inum, nip->meta.type); 1601 } 1602 if (error) { 1603 if (nip) { 1604 hammer2_inode_unlink_finisher(nip, 0); 1605 hammer2_inode_unlock(nip); 1606 nip = NULL; 1607 } 1608 *ap->a_vpp = NULL; 1609 } else { 1610 *ap->a_vpp = hammer2_igetv(nip, &error); 1611 hammer2_inode_unlock(nip); 1612 } 1613 1614 /* 1615 * Update dip's mtime 1616 */ 1617 if (error == 0) { 1618 uint64_t mtime; 1619 1620 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1621 hammer2_update_time(&mtime); 1622 hammer2_inode_modify(dip); 1623 dip->meta.mtime = mtime; 1624 hammer2_inode_unlock(dip); 1625 } 1626 1627 hammer2_trans_done(dip->pmp); 1628 1629 if (error == 0) { 1630 cache_setunresolved(ap->a_nch); 1631 cache_setvp(ap->a_nch, *ap->a_vpp); 1632 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1633 } 1634 return error; 1635 } 1636 1637 /* 1638 * hammer2_vop_nsymlink { nch, dvp, vpp, cred, vap, target } 1639 */ 1640 static 1641 int 1642 hammer2_vop_nsymlink(struct vop_nsymlink_args *ap) 1643 { 1644 hammer2_inode_t *dip; 1645 hammer2_inode_t *nip; 1646 struct namecache *ncp; 1647 const uint8_t *name; 1648 size_t name_len; 1649 hammer2_tid_t inum; 1650 int error; 1651 1652 dip = VTOI(ap->a_dvp); 1653 if (dip->pmp->ronly) 1654 return (EROFS); 1655 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1656 return (ENOSPC); 1657 1658 ncp = ap->a_nch->ncp; 1659 name = ncp->nc_name; 1660 name_len = ncp->nc_nlen; 1661 hammer2_pfs_memory_wait(dip->pmp); 1662 hammer2_trans_init(dip->pmp, 0); 1663 1664 ap->a_vap->va_type = VLNK; /* enforce type */ 1665 1666 /* 1667 * Create the softlink as an inode and then create the directory 1668 * entry. 1669 */ 1670 inum = hammer2_trans_newinum(dip->pmp); 1671 1672 nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred, 1673 NULL, 0, inum, 1674 inum, 0, 0, 1675 0, &error); 1676 if (error == 0) { 1677 error = hammer2_dirent_create(dip, name, name_len, 1678 nip->meta.inum, nip->meta.type); 1679 } 1680 if (error) { 1681 if (nip) { 1682 hammer2_inode_unlink_finisher(nip, 0); 1683 hammer2_inode_unlock(nip); 1684 nip = NULL; 1685 } 1686 *ap->a_vpp = NULL; 1687 hammer2_trans_done(dip->pmp); 1688 return error; 1689 } 1690 *ap->a_vpp = hammer2_igetv(nip, &error); 1691 1692 /* 1693 * Build the softlink (~like file data) and finalize the namecache. 1694 */ 1695 if (error == 0) { 1696 size_t bytes; 1697 struct uio auio; 1698 struct iovec aiov; 1699 1700 bytes = strlen(ap->a_target); 1701 1702 hammer2_inode_unlock(nip); 1703 bzero(&auio, sizeof(auio)); 1704 bzero(&aiov, sizeof(aiov)); 1705 auio.uio_iov = &aiov; 1706 auio.uio_segflg = UIO_SYSSPACE; 1707 auio.uio_rw = UIO_WRITE; 1708 auio.uio_resid = bytes; 1709 auio.uio_iovcnt = 1; 1710 auio.uio_td = curthread; 1711 aiov.iov_base = ap->a_target; 1712 aiov.iov_len = bytes; 1713 error = hammer2_write_file(nip, &auio, IO_APPEND, 0); 1714 /* XXX handle error */ 1715 error = 0; 1716 } else { 1717 hammer2_inode_unlock(nip); 1718 } 1719 1720 /* 1721 * Update dip's mtime 1722 */ 1723 if (error == 0) { 1724 uint64_t mtime; 1725 1726 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1727 hammer2_update_time(&mtime); 1728 hammer2_inode_modify(dip); 1729 dip->meta.mtime = mtime; 1730 hammer2_inode_unlock(dip); 1731 } 1732 1733 hammer2_trans_done(dip->pmp); 1734 1735 /* 1736 * Finalize namecache 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 * hammer2_vop_nremove { nch, dvp, cred } 1748 */ 1749 static 1750 int 1751 hammer2_vop_nremove(struct vop_nremove_args *ap) 1752 { 1753 hammer2_xop_unlink_t *xop; 1754 hammer2_inode_t *dip; 1755 hammer2_inode_t *ip; 1756 struct namecache *ncp; 1757 int error; 1758 int isopen; 1759 1760 dip = VTOI(ap->a_dvp); 1761 if (dip->pmp->ronly) 1762 return (EROFS); 1763 #if 0 1764 /* allow removals, except user to also bulkfree */ 1765 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1766 return (ENOSPC); 1767 #endif 1768 1769 ncp = ap->a_nch->ncp; 1770 1771 hammer2_pfs_memory_wait(dip->pmp); 1772 hammer2_trans_init(dip->pmp, 0); 1773 hammer2_inode_lock(dip, 0); 1774 1775 /* 1776 * The unlink XOP unlinks the path from the directory and 1777 * locates and returns the cluster associated with the real inode. 1778 * We have to handle nlinks here on the frontend. 1779 */ 1780 xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING); 1781 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen); 1782 1783 /* 1784 * The namecache entry is locked so nobody can use this namespace. 1785 * Calculate isopen to determine if this namespace has an open vp 1786 * associated with it and resolve the vp only if it does. 1787 * 1788 * We try to avoid resolving the vnode if nobody has it open, but 1789 * note that the test is via this namespace only. 1790 */ 1791 isopen = cache_isopen(ap->a_nch); 1792 xop->isdir = 0; 1793 xop->dopermanent = 0; 1794 hammer2_xop_start(&xop->head, hammer2_xop_unlink); 1795 1796 /* 1797 * Collect the real inode and adjust nlinks, destroy the real 1798 * inode if nlinks transitions to 0 and it was the real inode 1799 * (else it has already been removed). 1800 */ 1801 error = hammer2_xop_collect(&xop->head, 0); 1802 error = hammer2_error_to_errno(error); 1803 hammer2_inode_unlock(dip); 1804 1805 if (error == 0) { 1806 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1); 1807 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1808 if (ip) { 1809 hammer2_inode_unlink_finisher(ip, isopen); 1810 hammer2_inode_unlock(ip); 1811 } 1812 } else { 1813 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1814 } 1815 1816 /* 1817 * Update dip's mtime 1818 */ 1819 if (error == 0) { 1820 uint64_t mtime; 1821 1822 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1823 hammer2_update_time(&mtime); 1824 hammer2_inode_modify(dip); 1825 dip->meta.mtime = mtime; 1826 hammer2_inode_unlock(dip); 1827 } 1828 1829 hammer2_inode_run_sideq(dip->pmp, 0); 1830 hammer2_trans_done(dip->pmp); 1831 if (error == 0) { 1832 cache_unlink(ap->a_nch); 1833 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1834 } 1835 return (error); 1836 } 1837 1838 /* 1839 * hammer2_vop_nrmdir { nch, dvp, cred } 1840 */ 1841 static 1842 int 1843 hammer2_vop_nrmdir(struct vop_nrmdir_args *ap) 1844 { 1845 hammer2_xop_unlink_t *xop; 1846 hammer2_inode_t *dip; 1847 hammer2_inode_t *ip; 1848 struct namecache *ncp; 1849 int isopen; 1850 int error; 1851 1852 dip = VTOI(ap->a_dvp); 1853 if (dip->pmp->ronly) 1854 return (EROFS); 1855 #if 0 1856 /* allow removals, except user to also bulkfree */ 1857 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1858 return (ENOSPC); 1859 #endif 1860 1861 hammer2_pfs_memory_wait(dip->pmp); 1862 hammer2_trans_init(dip->pmp, 0); 1863 hammer2_inode_lock(dip, 0); 1864 1865 xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING); 1866 1867 ncp = ap->a_nch->ncp; 1868 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen); 1869 isopen = cache_isopen(ap->a_nch); 1870 xop->isdir = 1; 1871 xop->dopermanent = 0; 1872 hammer2_xop_start(&xop->head, hammer2_xop_unlink); 1873 1874 /* 1875 * Collect the real inode and adjust nlinks, destroy the real 1876 * inode if nlinks transitions to 0 and it was the real inode 1877 * (else it has already been removed). 1878 */ 1879 error = hammer2_xop_collect(&xop->head, 0); 1880 error = hammer2_error_to_errno(error); 1881 hammer2_inode_unlock(dip); 1882 1883 if (error == 0) { 1884 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1); 1885 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1886 if (ip) { 1887 hammer2_inode_unlink_finisher(ip, isopen); 1888 hammer2_inode_unlock(ip); 1889 } 1890 } else { 1891 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1892 } 1893 1894 /* 1895 * Update dip's mtime 1896 */ 1897 if (error == 0) { 1898 uint64_t mtime; 1899 1900 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1901 hammer2_update_time(&mtime); 1902 hammer2_inode_modify(dip); 1903 dip->meta.mtime = mtime; 1904 hammer2_inode_unlock(dip); 1905 } 1906 1907 hammer2_inode_run_sideq(dip->pmp, 0); 1908 hammer2_trans_done(dip->pmp); 1909 if (error == 0) { 1910 cache_unlink(ap->a_nch); 1911 hammer2_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1912 } 1913 return (error); 1914 } 1915 1916 /* 1917 * hammer2_vop_nrename { fnch, tnch, fdvp, tdvp, cred } 1918 */ 1919 static 1920 int 1921 hammer2_vop_nrename(struct vop_nrename_args *ap) 1922 { 1923 struct namecache *fncp; 1924 struct namecache *tncp; 1925 hammer2_inode_t *fdip; /* source directory */ 1926 hammer2_inode_t *tdip; /* target directory */ 1927 hammer2_inode_t *ip; /* file being renamed */ 1928 hammer2_inode_t *tip; /* replaced target during rename or NULL */ 1929 const uint8_t *fname; 1930 size_t fname_len; 1931 const uint8_t *tname; 1932 size_t tname_len; 1933 int error; 1934 int update_tdip; 1935 int update_fdip; 1936 hammer2_key_t tlhc; 1937 1938 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount) 1939 return(EXDEV); 1940 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount) 1941 return(EXDEV); 1942 1943 fdip = VTOI(ap->a_fdvp); /* source directory */ 1944 tdip = VTOI(ap->a_tdvp); /* target directory */ 1945 1946 if (fdip->pmp->ronly) 1947 return (EROFS); 1948 if (hammer2_vfs_enospace(fdip, 0, ap->a_cred) > 1) 1949 return (ENOSPC); 1950 1951 fncp = ap->a_fnch->ncp; /* entry name in source */ 1952 fname = fncp->nc_name; 1953 fname_len = fncp->nc_nlen; 1954 1955 tncp = ap->a_tnch->ncp; /* entry name in target */ 1956 tname = tncp->nc_name; 1957 tname_len = tncp->nc_nlen; 1958 1959 hammer2_pfs_memory_wait(tdip->pmp); 1960 hammer2_trans_init(tdip->pmp, 0); 1961 1962 update_tdip = 0; 1963 update_fdip = 0; 1964 1965 ip = VTOI(fncp->nc_vp); 1966 hammer2_inode_ref(ip); /* extra ref */ 1967 1968 /* 1969 * Lookup the target name to determine if a directory entry 1970 * is being overwritten. We only hold related inode locks 1971 * temporarily, the operating system is expected to protect 1972 * against rename races. 1973 */ 1974 tip = tncp->nc_vp ? VTOI(tncp->nc_vp) : NULL; 1975 if (tip) 1976 hammer2_inode_ref(tip); /* extra ref */ 1977 1978 /* 1979 * Can return NULL and error == EXDEV if the common parent 1980 * crosses a directory with the xlink flag set. 1981 * 1982 * For now try to avoid deadlocks with a simple pointer address 1983 * test. (tip) can be NULL. 1984 */ 1985 error = 0; 1986 if (fdip <= tdip) { 1987 hammer2_inode_lock(fdip, 0); 1988 hammer2_inode_lock(tdip, 0); 1989 } else { 1990 hammer2_inode_lock(tdip, 0); 1991 hammer2_inode_lock(fdip, 0); 1992 } 1993 if (tip) { 1994 if (ip <= tip) { 1995 hammer2_inode_lock(ip, 0); 1996 hammer2_inode_lock(tip, 0); 1997 } else { 1998 hammer2_inode_lock(tip, 0); 1999 hammer2_inode_lock(ip, 0); 2000 } 2001 } else { 2002 hammer2_inode_lock(ip, 0); 2003 } 2004 2005 #if 0 2006 /* 2007 * Delete the target namespace. 2008 * 2009 * REMOVED - NOW FOLDED INTO XOP_NRENAME OPERATION 2010 */ 2011 { 2012 hammer2_xop_unlink_t *xop2; 2013 hammer2_inode_t *tip; 2014 int isopen; 2015 2016 /* 2017 * The unlink XOP unlinks the path from the directory and 2018 * locates and returns the cluster associated with the real 2019 * inode. We have to handle nlinks here on the frontend. 2020 */ 2021 xop2 = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING); 2022 hammer2_xop_setname(&xop2->head, tname, tname_len); 2023 isopen = cache_isopen(ap->a_tnch); 2024 xop2->isdir = -1; 2025 xop2->dopermanent = 0; 2026 hammer2_xop_start(&xop2->head, hammer2_xop_unlink); 2027 2028 /* 2029 * Collect the real inode and adjust nlinks, destroy the real 2030 * inode if nlinks transitions to 0 and it was the real inode 2031 * (else it has already been removed). 2032 */ 2033 tnch_error = hammer2_xop_collect(&xop2->head, 0); 2034 tnch_error = hammer2_error_to_errno(tnch_error); 2035 /* hammer2_inode_unlock(tdip); */ 2036 2037 if (tnch_error == 0) { 2038 tip = hammer2_inode_get(tdip->pmp, NULL, 2039 &xop2->head.cluster, -1); 2040 hammer2_xop_retire(&xop2->head, HAMMER2_XOPMASK_VOP); 2041 if (tip) { 2042 hammer2_inode_unlink_finisher(tip, isopen); 2043 hammer2_inode_unlock(tip); 2044 } 2045 } else { 2046 hammer2_xop_retire(&xop2->head, HAMMER2_XOPMASK_VOP); 2047 } 2048 /* hammer2_inode_lock(tdip, 0); */ 2049 2050 if (tnch_error && tnch_error != ENOENT) { 2051 error = tnch_error; 2052 goto done2; 2053 } 2054 update_tdip = 1; 2055 } 2056 #endif 2057 2058 /* 2059 * Resolve the collision space for (tdip, tname, tname_len) 2060 * 2061 * tdip must be held exclusively locked to prevent races since 2062 * multiple filenames can end up in the same collision space. 2063 */ 2064 { 2065 hammer2_xop_scanlhc_t *sxop; 2066 hammer2_tid_t lhcbase; 2067 2068 tlhc = hammer2_dirhash(tname, tname_len); 2069 lhcbase = tlhc; 2070 sxop = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING); 2071 sxop->lhc = tlhc; 2072 hammer2_xop_start(&sxop->head, hammer2_xop_scanlhc); 2073 while ((error = hammer2_xop_collect(&sxop->head, 0)) == 0) { 2074 if (tlhc != sxop->head.cluster.focus->bref.key) 2075 break; 2076 ++tlhc; 2077 } 2078 error = hammer2_error_to_errno(error); 2079 hammer2_xop_retire(&sxop->head, HAMMER2_XOPMASK_VOP); 2080 2081 if (error) { 2082 if (error != ENOENT) 2083 goto done2; 2084 ++tlhc; 2085 error = 0; 2086 } 2087 if ((lhcbase ^ tlhc) & ~HAMMER2_DIRHASH_LOMASK) { 2088 error = ENOSPC; 2089 goto done2; 2090 } 2091 } 2092 2093 /* 2094 * Ready to go, issue the rename to the backend. Note that meta-data 2095 * updates to the related inodes occur separately from the rename 2096 * operation. 2097 * 2098 * NOTE: While it is not necessary to update ip->meta.name*, doing 2099 * so aids catastrophic recovery and debugging. 2100 */ 2101 if (error == 0) { 2102 hammer2_xop_nrename_t *xop4; 2103 2104 xop4 = hammer2_xop_alloc(fdip, HAMMER2_XOP_MODIFYING); 2105 xop4->lhc = tlhc; 2106 xop4->ip_key = ip->meta.name_key; 2107 hammer2_xop_setip2(&xop4->head, ip); 2108 hammer2_xop_setip3(&xop4->head, tdip); 2109 hammer2_xop_setname(&xop4->head, fname, fname_len); 2110 hammer2_xop_setname2(&xop4->head, tname, tname_len); 2111 hammer2_xop_start(&xop4->head, hammer2_xop_nrename); 2112 2113 error = hammer2_xop_collect(&xop4->head, 0); 2114 error = hammer2_error_to_errno(error); 2115 hammer2_xop_retire(&xop4->head, HAMMER2_XOPMASK_VOP); 2116 2117 if (error == ENOENT) 2118 error = 0; 2119 2120 /* 2121 * Update inode meta-data. 2122 * 2123 * WARNING! The in-memory inode (ip) structure does not 2124 * maintain a copy of the inode's filename buffer. 2125 */ 2126 if (error == 0 && 2127 (ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE)) { 2128 hammer2_inode_modify(ip); 2129 ip->meta.name_len = tname_len; 2130 ip->meta.name_key = tlhc; 2131 } 2132 if (error == 0) { 2133 hammer2_inode_modify(ip); 2134 ip->meta.iparent = tdip->meta.inum; 2135 } 2136 update_fdip = 1; 2137 update_tdip = 1; 2138 } 2139 2140 done2: 2141 /* 2142 * If no error, the backend has replaced the target directory entry. 2143 * We must adjust nlinks on the original replace target if it exists. 2144 */ 2145 if (error == 0 && tip) { 2146 int isopen; 2147 2148 isopen = cache_isopen(ap->a_tnch); 2149 hammer2_inode_unlink_finisher(tip, isopen); 2150 } 2151 2152 /* 2153 * Update directory mtimes to represent the something changed. 2154 */ 2155 if (update_fdip || update_tdip) { 2156 uint64_t mtime; 2157 2158 hammer2_update_time(&mtime); 2159 if (update_fdip) { 2160 hammer2_inode_modify(fdip); 2161 fdip->meta.mtime = mtime; 2162 } 2163 if (update_tdip) { 2164 hammer2_inode_modify(tdip); 2165 tdip->meta.mtime = mtime; 2166 } 2167 } 2168 if (tip) { 2169 hammer2_inode_unlock(tip); 2170 hammer2_inode_drop(tip); 2171 } 2172 hammer2_inode_unlock(ip); 2173 hammer2_inode_unlock(tdip); 2174 hammer2_inode_unlock(fdip); 2175 hammer2_inode_drop(ip); 2176 hammer2_inode_run_sideq(fdip->pmp, 0); 2177 2178 hammer2_trans_done(tdip->pmp); 2179 2180 /* 2181 * Issue the namecache update after unlocking all the internal 2182 * hammer structures, otherwise we might deadlock. 2183 */ 2184 if (error == 0 && tip) { 2185 cache_unlink(ap->a_tnch); 2186 cache_setunresolved(ap->a_tnch); 2187 } 2188 if (error == 0) { 2189 cache_rename(ap->a_fnch, ap->a_tnch); 2190 hammer2_knote(ap->a_fdvp, NOTE_WRITE); 2191 hammer2_knote(ap->a_tdvp, NOTE_WRITE); 2192 hammer2_knote(fncp->nc_vp, NOTE_RENAME); 2193 } 2194 2195 return (error); 2196 } 2197 2198 /* 2199 * hammer2_vop_ioctl { vp, command, data, fflag, cred } 2200 */ 2201 static 2202 int 2203 hammer2_vop_ioctl(struct vop_ioctl_args *ap) 2204 { 2205 hammer2_inode_t *ip; 2206 int error; 2207 2208 ip = VTOI(ap->a_vp); 2209 2210 error = hammer2_ioctl(ip, ap->a_command, (void *)ap->a_data, 2211 ap->a_fflag, ap->a_cred); 2212 return (error); 2213 } 2214 2215 static 2216 int 2217 hammer2_vop_mountctl(struct vop_mountctl_args *ap) 2218 { 2219 struct mount *mp; 2220 hammer2_pfs_t *pmp; 2221 int rc; 2222 2223 switch (ap->a_op) { 2224 case (MOUNTCTL_SET_EXPORT): 2225 mp = ap->a_head.a_ops->head.vv_mount; 2226 pmp = MPTOPMP(mp); 2227 2228 if (ap->a_ctllen != sizeof(struct export_args)) 2229 rc = (EINVAL); 2230 else 2231 rc = vfs_export(mp, &pmp->export, 2232 (const struct export_args *)ap->a_ctl); 2233 break; 2234 default: 2235 rc = vop_stdmountctl(ap); 2236 break; 2237 } 2238 return (rc); 2239 } 2240 2241 /* 2242 * KQFILTER 2243 */ 2244 static void filt_hammer2detach(struct knote *kn); 2245 static int filt_hammer2read(struct knote *kn, long hint); 2246 static int filt_hammer2write(struct knote *kn, long hint); 2247 static int filt_hammer2vnode(struct knote *kn, long hint); 2248 2249 static struct filterops hammer2read_filtops = 2250 { FILTEROP_ISFD | FILTEROP_MPSAFE, 2251 NULL, filt_hammer2detach, filt_hammer2read }; 2252 static struct filterops hammer2write_filtops = 2253 { FILTEROP_ISFD | FILTEROP_MPSAFE, 2254 NULL, filt_hammer2detach, filt_hammer2write }; 2255 static struct filterops hammer2vnode_filtops = 2256 { FILTEROP_ISFD | FILTEROP_MPSAFE, 2257 NULL, filt_hammer2detach, filt_hammer2vnode }; 2258 2259 static 2260 int 2261 hammer2_vop_kqfilter(struct vop_kqfilter_args *ap) 2262 { 2263 struct vnode *vp = ap->a_vp; 2264 struct knote *kn = ap->a_kn; 2265 2266 switch (kn->kn_filter) { 2267 case EVFILT_READ: 2268 kn->kn_fop = &hammer2read_filtops; 2269 break; 2270 case EVFILT_WRITE: 2271 kn->kn_fop = &hammer2write_filtops; 2272 break; 2273 case EVFILT_VNODE: 2274 kn->kn_fop = &hammer2vnode_filtops; 2275 break; 2276 default: 2277 return (EOPNOTSUPP); 2278 } 2279 2280 kn->kn_hook = (caddr_t)vp; 2281 2282 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 2283 2284 return(0); 2285 } 2286 2287 static void 2288 filt_hammer2detach(struct knote *kn) 2289 { 2290 struct vnode *vp = (void *)kn->kn_hook; 2291 2292 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 2293 } 2294 2295 static int 2296 filt_hammer2read(struct knote *kn, long hint) 2297 { 2298 struct vnode *vp = (void *)kn->kn_hook; 2299 hammer2_inode_t *ip = VTOI(vp); 2300 off_t off; 2301 2302 if (hint == NOTE_REVOKE) { 2303 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 2304 return(1); 2305 } 2306 off = ip->meta.size - kn->kn_fp->f_offset; 2307 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 2308 if (kn->kn_sfflags & NOTE_OLDAPI) 2309 return(1); 2310 return (kn->kn_data != 0); 2311 } 2312 2313 2314 static int 2315 filt_hammer2write(struct knote *kn, long hint) 2316 { 2317 if (hint == NOTE_REVOKE) 2318 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 2319 kn->kn_data = 0; 2320 return (1); 2321 } 2322 2323 static int 2324 filt_hammer2vnode(struct knote *kn, long hint) 2325 { 2326 if (kn->kn_sfflags & hint) 2327 kn->kn_fflags |= hint; 2328 if (hint == NOTE_REVOKE) { 2329 kn->kn_flags |= (EV_EOF | EV_NODATA); 2330 return (1); 2331 } 2332 return (kn->kn_fflags != 0); 2333 } 2334 2335 /* 2336 * FIFO VOPS 2337 */ 2338 static 2339 int 2340 hammer2_vop_markatime(struct vop_markatime_args *ap) 2341 { 2342 hammer2_inode_t *ip; 2343 struct vnode *vp; 2344 2345 vp = ap->a_vp; 2346 ip = VTOI(vp); 2347 2348 if (ip->pmp->ronly) 2349 return (EROFS); 2350 return(0); 2351 } 2352 2353 static 2354 int 2355 hammer2_vop_fifokqfilter(struct vop_kqfilter_args *ap) 2356 { 2357 int error; 2358 2359 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 2360 if (error) 2361 error = hammer2_vop_kqfilter(ap); 2362 return(error); 2363 } 2364 2365 /* 2366 * VOPS vector 2367 */ 2368 struct vop_ops hammer2_vnode_vops = { 2369 .vop_default = vop_defaultop, 2370 .vop_fsync = hammer2_vop_fsync, 2371 .vop_getpages = vop_stdgetpages, 2372 .vop_putpages = vop_stdputpages, 2373 .vop_access = hammer2_vop_access, 2374 .vop_advlock = hammer2_vop_advlock, 2375 .vop_close = hammer2_vop_close, 2376 .vop_nlink = hammer2_vop_nlink, 2377 .vop_ncreate = hammer2_vop_ncreate, 2378 .vop_nsymlink = hammer2_vop_nsymlink, 2379 .vop_nremove = hammer2_vop_nremove, 2380 .vop_nrmdir = hammer2_vop_nrmdir, 2381 .vop_nrename = hammer2_vop_nrename, 2382 .vop_getattr = hammer2_vop_getattr, 2383 .vop_setattr = hammer2_vop_setattr, 2384 .vop_readdir = hammer2_vop_readdir, 2385 .vop_readlink = hammer2_vop_readlink, 2386 .vop_getpages = vop_stdgetpages, 2387 .vop_putpages = vop_stdputpages, 2388 .vop_read = hammer2_vop_read, 2389 .vop_write = hammer2_vop_write, 2390 .vop_open = hammer2_vop_open, 2391 .vop_inactive = hammer2_vop_inactive, 2392 .vop_reclaim = hammer2_vop_reclaim, 2393 .vop_nresolve = hammer2_vop_nresolve, 2394 .vop_nlookupdotdot = hammer2_vop_nlookupdotdot, 2395 .vop_nmkdir = hammer2_vop_nmkdir, 2396 .vop_nmknod = hammer2_vop_nmknod, 2397 .vop_ioctl = hammer2_vop_ioctl, 2398 .vop_mountctl = hammer2_vop_mountctl, 2399 .vop_bmap = hammer2_vop_bmap, 2400 .vop_strategy = hammer2_vop_strategy, 2401 .vop_kqfilter = hammer2_vop_kqfilter 2402 }; 2403 2404 struct vop_ops hammer2_spec_vops = { 2405 .vop_default = vop_defaultop, 2406 .vop_fsync = hammer2_vop_fsync, 2407 .vop_read = vop_stdnoread, 2408 .vop_write = vop_stdnowrite, 2409 .vop_access = hammer2_vop_access, 2410 .vop_close = hammer2_vop_close, 2411 .vop_markatime = hammer2_vop_markatime, 2412 .vop_getattr = hammer2_vop_getattr, 2413 .vop_inactive = hammer2_vop_inactive, 2414 .vop_reclaim = hammer2_vop_reclaim, 2415 .vop_setattr = hammer2_vop_setattr 2416 }; 2417 2418 struct vop_ops hammer2_fifo_vops = { 2419 .vop_default = fifo_vnoperate, 2420 .vop_fsync = hammer2_vop_fsync, 2421 #if 0 2422 .vop_read = hammer2_vop_fiforead, 2423 .vop_write = hammer2_vop_fifowrite, 2424 #endif 2425 .vop_access = hammer2_vop_access, 2426 #if 0 2427 .vop_close = hammer2_vop_fifoclose, 2428 #endif 2429 .vop_markatime = hammer2_vop_markatime, 2430 .vop_getattr = hammer2_vop_getattr, 2431 .vop_inactive = hammer2_vop_inactive, 2432 .vop_reclaim = hammer2_vop_reclaim, 2433 .vop_setattr = hammer2_vop_setattr, 2434 .vop_kqfilter = hammer2_vop_fifokqfilter 2435 }; 2436 2437