1 /* 2 * Copyright (c) 2011-2013 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 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 3. Neither the name of The DragonFly Project nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific, prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 /* 36 * Kernel Filesystem interface 37 * 38 * NOTE! local ipdata pointers must be reloaded on any modifying operation 39 * to the inode as its underlying chain may have changed. 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/fcntl.h> 46 #include <sys/buf.h> 47 #include <sys/proc.h> 48 #include <sys/namei.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 55 #include "hammer2.h" 56 57 #define ZFOFFSET (-2LL) 58 59 static int hammer2_read_file(hammer2_inode_t *ip, struct uio *uio, 60 int seqcount); 61 static int hammer2_write_file(hammer2_trans_t *trans, hammer2_inode_t *ip, 62 hammer2_chain_t **parentp, 63 struct uio *uio, int ioflag, int seqcount); 64 static hammer2_off_t hammer2_assign_physical(hammer2_trans_t *trans, 65 hammer2_inode_t *ip, hammer2_chain_t **parentp, 66 hammer2_key_t lbase, int lblksize, 67 int *errorp); 68 static void hammer2_extend_file(hammer2_trans_t *trans, hammer2_inode_t *ip, 69 hammer2_chain_t **parentp, hammer2_key_t nsize); 70 static void hammer2_truncate_file(hammer2_trans_t *trans, hammer2_inode_t *ip, 71 hammer2_chain_t **parentp, hammer2_key_t nsize); 72 73 static __inline 74 void 75 hammer2_knote(struct vnode *vp, int flags) 76 { 77 if (flags) 78 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags); 79 } 80 81 /* 82 * Last reference to a vnode is going away but it is still cached. 83 */ 84 static 85 int 86 hammer2_vop_inactive(struct vop_inactive_args *ap) 87 { 88 hammer2_inode_t *ip; 89 hammer2_chain_t *parent; 90 struct vnode *vp; 91 92 vp = ap->a_vp; 93 ip = VTOI(vp); 94 95 /* 96 * Degenerate case 97 */ 98 if (ip == NULL) { 99 vrecycle(vp); 100 return (0); 101 } 102 103 /* 104 * Detect updates to the embedded data which may be synchronized by 105 * the strategy code. Simply mark the inode modified so it gets 106 * picked up by our normal flush. 107 */ 108 parent = hammer2_inode_lock_ex(ip); 109 KKASSERT(parent); 110 111 /* 112 * Check for deleted inodes and recycle immediately. 113 */ 114 if (parent->flags & HAMMER2_CHAIN_DELETED) { 115 hammer2_inode_unlock_ex(ip, parent); 116 vrecycle(vp); 117 } else { 118 hammer2_inode_unlock_ex(ip, parent); 119 } 120 return (0); 121 } 122 123 /* 124 * Reclaim a vnode so that it can be reused; after the inode is 125 * disassociated, the filesystem must manage it alone. 126 */ 127 static 128 int 129 hammer2_vop_reclaim(struct vop_reclaim_args *ap) 130 { 131 hammer2_chain_t *chain; 132 hammer2_inode_t *ip; 133 hammer2_mount_t *hmp; 134 #if 0 135 hammer2_trans_t trans; 136 #endif 137 struct vnode *vp; 138 139 vp = ap->a_vp; 140 ip = VTOI(vp); 141 if (ip == NULL) 142 return(0); 143 hmp = ip->hmp; 144 145 /* 146 * Set SUBMODIFIED so we can detect and propagate the DESTROYED 147 * bit in the flush code. 148 * 149 * ip->chain might be stale, correct it before checking as older 150 * versions of the chain are likely marked deleted even if the 151 * file hasn't been. XXX ip->chain should never be stale on 152 * reclaim. 153 */ 154 chain = hammer2_inode_lock_ex(ip); 155 #if 0 156 if (chain->next_parent) 157 kprintf("RECLAIM DUPLINKED IP: %p ip->ch=%p ch=%p np=%p\n", 158 ip, ip->chain, chain, chain->next_parent); 159 #endif 160 161 /* 162 * The final close of a deleted file or directory marks it for 163 * destruction. The DESTROYED flag allows the flusher to shortcut 164 * any modified blocks still unflushed (that is, just ignore them). 165 * 166 * HAMMER2 usually does not try to optimize the freemap by returning 167 * deleted blocks to it as it does not usually know how many snapshots 168 * might be referencing portions of the file/dir. XXX TODO. 169 * 170 * XXX TODO - However, any modified file as-of when a snapshot is made 171 * cannot use this optimization as some of the modifications 172 * may wind up being part of the snapshot. 173 */ 174 vp->v_data = NULL; 175 ip->vp = NULL; 176 if (chain->flags & HAMMER2_CHAIN_DELETED) { 177 KKASSERT(chain->flags & HAMMER2_CHAIN_DELETED); 178 atomic_set_int(&chain->flags, HAMMER2_CHAIN_DESTROYED | 179 HAMMER2_CHAIN_SUBMODIFIED); 180 } 181 #if 0 182 /* 183 * XXX chains will be flushed on sync, no need to do it here. 184 */ 185 if (chain->flags & (HAMMER2_CHAIN_MODIFIED | 186 HAMMER2_CHAIN_DELETED | 187 HAMMER2_CHAIN_SUBMODIFIED)) { 188 hammer2_trans_init(ip->hmp, &trans, HAMMER2_TRANS_ISFLUSH); 189 hammer2_chain_flush(&trans, chain); 190 hammer2_trans_done(&trans); 191 } 192 #endif 193 hammer2_inode_unlock_ex(ip, chain); /* unlock */ 194 hammer2_inode_drop(ip); /* vp ref */ 195 /* chain no longer referenced */ 196 /* chain = NULL; not needed */ 197 198 /* 199 * XXX handle background sync when ip dirty, kernel will no longer 200 * notify us regarding this inode because there is no longer a 201 * vnode attached to it. 202 */ 203 204 return (0); 205 } 206 207 static 208 int 209 hammer2_vop_fsync(struct vop_fsync_args *ap) 210 { 211 hammer2_mount_t *hmp; 212 hammer2_inode_t *ip; 213 hammer2_trans_t trans; 214 hammer2_chain_t *chain; 215 struct vnode *vp; 216 217 vp = ap->a_vp; 218 ip = VTOI(vp); 219 hmp = ip->hmp; 220 221 hammer2_trans_init(hmp, &trans, HAMMER2_TRANS_ISFLUSH); 222 chain = hammer2_inode_lock_ex(ip); 223 224 vfsync(vp, ap->a_waitfor, 1, NULL, NULL); 225 226 /* 227 * Calling chain_flush here creates a lot of duplicative 228 * COW operations due to non-optimal vnode ordering. 229 * 230 * Only do it for an actual fsync() syscall. The other forms 231 * which call this function will eventually call chain_flush 232 * on the volume root as a catch-all, which is far more optimal. 233 */ 234 atomic_clear_int(&ip->flags, HAMMER2_INODE_MODIFIED); 235 if (ap->a_flags & VOP_FSYNC_SYSCALL) { 236 hammer2_chain_flush(&trans, chain); 237 } 238 hammer2_inode_unlock_ex(ip, chain); 239 hammer2_trans_done(&trans); 240 241 return (0); 242 } 243 244 static 245 int 246 hammer2_vop_access(struct vop_access_args *ap) 247 { 248 hammer2_inode_t *ip = VTOI(ap->a_vp); 249 hammer2_inode_data_t *ipdata; 250 hammer2_chain_t *chain; 251 uid_t uid; 252 gid_t gid; 253 int error; 254 255 chain = hammer2_inode_lock_sh(ip); 256 ipdata = &chain->data->ipdata; 257 uid = hammer2_to_unix_xid(&ipdata->uid); 258 gid = hammer2_to_unix_xid(&ipdata->gid); 259 error = vop_helper_access(ap, uid, gid, ipdata->mode, ipdata->uflags); 260 hammer2_inode_unlock_sh(ip, chain); 261 262 return (error); 263 } 264 265 static 266 int 267 hammer2_vop_getattr(struct vop_getattr_args *ap) 268 { 269 hammer2_inode_data_t *ipdata; 270 hammer2_chain_t *chain; 271 hammer2_pfsmount_t *pmp; 272 hammer2_inode_t *ip; 273 struct vnode *vp; 274 struct vattr *vap; 275 276 vp = ap->a_vp; 277 vap = ap->a_vap; 278 279 ip = VTOI(vp); 280 pmp = ip->pmp; 281 282 chain = hammer2_inode_lock_sh(ip); 283 ipdata = &chain->data->ipdata; 284 285 vap->va_fsid = pmp->mp->mnt_stat.f_fsid.val[0]; 286 vap->va_fileid = ipdata->inum; 287 vap->va_mode = ipdata->mode; 288 vap->va_nlink = ipdata->nlinks; 289 vap->va_uid = hammer2_to_unix_xid(&ipdata->uid); 290 vap->va_gid = hammer2_to_unix_xid(&ipdata->gid); 291 vap->va_rmajor = 0; 292 vap->va_rminor = 0; 293 vap->va_size = ipdata->size; 294 vap->va_blocksize = HAMMER2_PBUFSIZE; 295 vap->va_flags = ipdata->uflags; 296 hammer2_time_to_timespec(ipdata->ctime, &vap->va_ctime); 297 hammer2_time_to_timespec(ipdata->mtime, &vap->va_mtime); 298 hammer2_time_to_timespec(ipdata->mtime, &vap->va_atime); 299 vap->va_gen = 1; 300 vap->va_bytes = vap->va_size; /* XXX */ 301 vap->va_type = hammer2_get_vtype(chain); 302 vap->va_filerev = 0; 303 vap->va_uid_uuid = ipdata->uid; 304 vap->va_gid_uuid = ipdata->gid; 305 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID | 306 VA_FSID_UUID_VALID; 307 308 hammer2_inode_unlock_sh(ip, chain); 309 310 return (0); 311 } 312 313 static 314 int 315 hammer2_vop_setattr(struct vop_setattr_args *ap) 316 { 317 hammer2_inode_data_t *ipdata; 318 hammer2_inode_t *ip; 319 hammer2_mount_t *hmp; 320 hammer2_chain_t *chain; 321 hammer2_trans_t trans; 322 struct vnode *vp; 323 struct vattr *vap; 324 int error; 325 int kflags = 0; 326 int domtime = 0; 327 uint64_t ctime; 328 329 vp = ap->a_vp; 330 vap = ap->a_vap; 331 hammer2_update_time(&ctime); 332 333 ip = VTOI(vp); 334 hmp = ip->hmp; 335 336 if (hmp->ronly) 337 return(EROFS); 338 339 hammer2_trans_init(hmp, &trans, 0); 340 chain = hammer2_inode_lock_ex(ip); 341 ipdata = &chain->data->ipdata; 342 error = 0; 343 344 if (vap->va_flags != VNOVAL) { 345 u_int32_t flags; 346 347 flags = ipdata->uflags; 348 error = vop_helper_setattr_flags(&flags, vap->va_flags, 349 hammer2_to_unix_xid(&ipdata->uid), 350 ap->a_cred); 351 if (error == 0) { 352 if (ipdata->uflags != flags) { 353 ipdata = hammer2_chain_modify_ip(&trans, ip, 354 &chain, 0); 355 ipdata->uflags = flags; 356 ipdata->ctime = ctime; 357 kflags |= NOTE_ATTRIB; 358 } 359 if (ipdata->uflags & (IMMUTABLE | APPEND)) { 360 error = 0; 361 goto done; 362 } 363 } 364 goto done; 365 } 366 if (ipdata->uflags & (IMMUTABLE | APPEND)) { 367 error = EPERM; 368 goto done; 369 } 370 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 371 mode_t cur_mode = ipdata->mode; 372 uid_t cur_uid = hammer2_to_unix_xid(&ipdata->uid); 373 gid_t cur_gid = hammer2_to_unix_xid(&ipdata->gid); 374 uuid_t uuid_uid; 375 uuid_t uuid_gid; 376 377 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid, 378 ap->a_cred, 379 &cur_uid, &cur_gid, &cur_mode); 380 if (error == 0) { 381 hammer2_guid_to_uuid(&uuid_uid, cur_uid); 382 hammer2_guid_to_uuid(&uuid_gid, cur_gid); 383 if (bcmp(&uuid_uid, &ipdata->uid, sizeof(uuid_uid)) || 384 bcmp(&uuid_gid, &ipdata->gid, sizeof(uuid_gid)) || 385 ipdata->mode != cur_mode 386 ) { 387 ipdata = hammer2_chain_modify_ip(&trans, ip, 388 &chain, 0); 389 ipdata->uid = uuid_uid; 390 ipdata->gid = uuid_gid; 391 ipdata->mode = cur_mode; 392 ipdata->ctime = ctime; 393 } 394 kflags |= NOTE_ATTRIB; 395 } 396 } 397 398 /* 399 * Resize the file 400 */ 401 if (vap->va_size != VNOVAL && ipdata->size != vap->va_size) { 402 switch(vp->v_type) { 403 case VREG: 404 if (vap->va_size == ipdata->size) 405 break; 406 if (vap->va_size < ipdata->size) { 407 hammer2_truncate_file(&trans, ip, 408 &chain, vap->va_size); 409 } else { 410 hammer2_extend_file(&trans, ip, 411 &chain, vap->va_size); 412 } 413 ipdata = &chain->data->ipdata; /* RELOAD */ 414 domtime = 1; 415 break; 416 default: 417 error = EINVAL; 418 goto done; 419 } 420 } 421 #if 0 422 /* atime not supported */ 423 if (vap->va_atime.tv_sec != VNOVAL) { 424 ipdata = hammer2_chain_modify_ip(&trans, ip, &chain, 0); 425 ipdata->atime = hammer2_timespec_to_time(&vap->va_atime); 426 kflags |= NOTE_ATTRIB; 427 } 428 #endif 429 if (vap->va_mtime.tv_sec != VNOVAL) { 430 ipdata = hammer2_chain_modify_ip(&trans, ip, &chain, 0); 431 ipdata->mtime = hammer2_timespec_to_time(&vap->va_mtime); 432 kflags |= NOTE_ATTRIB; 433 } 434 if (vap->va_mode != (mode_t)VNOVAL) { 435 mode_t cur_mode = ipdata->mode; 436 uid_t cur_uid = hammer2_to_unix_xid(&ipdata->uid); 437 gid_t cur_gid = hammer2_to_unix_xid(&ipdata->gid); 438 439 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred, 440 cur_uid, cur_gid, &cur_mode); 441 if (error == 0 && ipdata->mode != cur_mode) { 442 ipdata = hammer2_chain_modify_ip(&trans, ip, &chain, 0); 443 ipdata->mode = cur_mode; 444 ipdata->ctime = ctime; 445 kflags |= NOTE_ATTRIB; 446 } 447 } 448 done: 449 hammer2_inode_unlock_ex(ip, chain); 450 hammer2_trans_done(&trans); 451 return (error); 452 } 453 454 static 455 int 456 hammer2_vop_readdir(struct vop_readdir_args *ap) 457 { 458 hammer2_inode_data_t *ipdata; 459 hammer2_mount_t *hmp; 460 hammer2_inode_t *ip; 461 hammer2_inode_t *xip; 462 hammer2_chain_t *parent; 463 hammer2_chain_t *chain; 464 hammer2_chain_t *xchain; 465 hammer2_tid_t inum; 466 hammer2_key_t lkey; 467 struct uio *uio; 468 off_t *cookies; 469 off_t saveoff; 470 int cookie_index; 471 int ncookies; 472 int error; 473 int dtype; 474 int r; 475 476 ip = VTOI(ap->a_vp); 477 hmp = ip->hmp; 478 uio = ap->a_uio; 479 saveoff = uio->uio_offset; 480 481 /* 482 * Setup cookies directory entry cookies if requested 483 */ 484 if (ap->a_ncookies) { 485 ncookies = uio->uio_resid / 16 + 1; 486 if (ncookies > 1024) 487 ncookies = 1024; 488 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 489 } else { 490 ncookies = -1; 491 cookies = NULL; 492 } 493 cookie_index = 0; 494 495 parent = hammer2_inode_lock_sh(ip); 496 ipdata = &parent->data->ipdata; 497 498 /* 499 * Handle artificial entries. To ensure that only positive 64 bit 500 * quantities are returned to userland we always strip off bit 63. 501 * The hash code is designed such that codes 0x0000-0x7FFF are not 502 * used, allowing us to use these codes for articial entries. 503 * 504 * Entry 0 is used for '.' and entry 1 is used for '..'. Do not 505 * allow '..' to cross the mount point into (e.g.) the super-root. 506 */ 507 error = 0; 508 chain = (void *)(intptr_t)-1; /* non-NULL for early goto done case */ 509 510 if (saveoff == 0) { 511 inum = ipdata->inum & HAMMER2_DIRHASH_USERMSK; 512 r = vop_write_dirent(&error, uio, inum, DT_DIR, 1, "."); 513 if (r) 514 goto done; 515 if (cookies) 516 cookies[cookie_index] = saveoff; 517 ++saveoff; 518 ++cookie_index; 519 if (cookie_index == ncookies) 520 goto done; 521 } 522 523 if (saveoff == 1) { 524 /* 525 * Be careful with lockorder when accessing ".." 526 * 527 * (ip is the current dir. xip is the parent dir). 528 */ 529 inum = ipdata->inum & HAMMER2_DIRHASH_USERMSK; 530 while (ip->pip != NULL && ip != ip->pmp->iroot) { 531 xip = ip->pip; 532 hammer2_inode_ref(xip); 533 hammer2_inode_unlock_sh(ip, parent); 534 xchain = hammer2_inode_lock_sh(xip); 535 parent = hammer2_inode_lock_sh(ip); 536 hammer2_inode_drop(xip); 537 if (xip == ip->pip) { 538 inum = xip->chain->data->ipdata.inum & 539 HAMMER2_DIRHASH_USERMSK; 540 hammer2_inode_unlock_sh(xip, xchain); 541 break; 542 } 543 hammer2_inode_unlock_sh(xip, xchain); 544 } 545 r = vop_write_dirent(&error, uio, inum, DT_DIR, 2, ".."); 546 if (r) 547 goto done; 548 if (cookies) 549 cookies[cookie_index] = saveoff; 550 ++saveoff; 551 ++cookie_index; 552 if (cookie_index == ncookies) 553 goto done; 554 } 555 556 lkey = saveoff | HAMMER2_DIRHASH_VISIBLE; 557 558 /* 559 * parent is the inode chain, already locked for us. Don't 560 * double lock shared locks as this will screw up upgrades. 561 */ 562 if (error) { 563 goto done; 564 } 565 chain = hammer2_chain_lookup(&parent, lkey, lkey, 566 HAMMER2_LOOKUP_SHARED); 567 if (chain == NULL) { 568 chain = hammer2_chain_lookup(&parent, 569 lkey, (hammer2_key_t)-1, 570 HAMMER2_LOOKUP_SHARED); 571 } 572 while (chain) { 573 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE) { 574 dtype = hammer2_get_dtype(chain); 575 saveoff = chain->bref.key & HAMMER2_DIRHASH_USERMSK; 576 r = vop_write_dirent(&error, uio, 577 chain->data->ipdata.inum & 578 HAMMER2_DIRHASH_USERMSK, 579 dtype, 580 chain->data->ipdata.name_len, 581 chain->data->ipdata.filename); 582 if (r) 583 break; 584 if (cookies) 585 cookies[cookie_index] = saveoff; 586 ++cookie_index; 587 } else { 588 /* XXX chain error */ 589 kprintf("bad chain type readdir %d\n", 590 chain->bref.type); 591 } 592 593 /* 594 * Keys may not be returned in order so once we have a 595 * placemarker (chain) the scan must allow the full range 596 * or some entries will be missed. 597 */ 598 chain = hammer2_chain_next(&parent, chain, 599 HAMMER2_DIRHASH_VISIBLE, 600 (hammer2_key_t)-1, 601 HAMMER2_LOOKUP_SHARED); 602 if (chain) { 603 saveoff = (chain->bref.key & 604 HAMMER2_DIRHASH_USERMSK) + 1; 605 } else { 606 saveoff = (hammer2_key_t)-1; 607 } 608 if (cookie_index == ncookies) 609 break; 610 } 611 if (chain) 612 hammer2_chain_unlock(chain); 613 done: 614 hammer2_inode_unlock_sh(ip, parent); 615 if (ap->a_eofflag) 616 *ap->a_eofflag = (chain == NULL); 617 uio->uio_offset = saveoff & ~HAMMER2_DIRHASH_VISIBLE; 618 if (error && cookie_index == 0) { 619 if (cookies) { 620 kfree(cookies, M_TEMP); 621 *ap->a_ncookies = 0; 622 *ap->a_cookies = NULL; 623 } 624 } else { 625 if (cookies) { 626 *ap->a_ncookies = cookie_index; 627 *ap->a_cookies = cookies; 628 } 629 } 630 return (error); 631 } 632 633 /* 634 * hammer2_vop_readlink { vp, uio, cred } 635 */ 636 static 637 int 638 hammer2_vop_readlink(struct vop_readlink_args *ap) 639 { 640 struct vnode *vp; 641 hammer2_mount_t *hmp; 642 hammer2_inode_t *ip; 643 int error; 644 645 vp = ap->a_vp; 646 if (vp->v_type != VLNK) 647 return (EINVAL); 648 ip = VTOI(vp); 649 hmp = ip->hmp; 650 651 error = hammer2_read_file(ip, ap->a_uio, 0); 652 return (error); 653 } 654 655 static 656 int 657 hammer2_vop_read(struct vop_read_args *ap) 658 { 659 struct vnode *vp; 660 hammer2_mount_t *hmp; 661 hammer2_inode_t *ip; 662 struct uio *uio; 663 int error; 664 int seqcount; 665 int bigread; 666 667 /* 668 * Read operations supported on this vnode? 669 */ 670 vp = ap->a_vp; 671 if (vp->v_type != VREG) 672 return (EINVAL); 673 674 /* 675 * Misc 676 */ 677 ip = VTOI(vp); 678 hmp = ip->hmp; 679 uio = ap->a_uio; 680 error = 0; 681 682 seqcount = ap->a_ioflag >> 16; 683 bigread = (uio->uio_resid > 100 * 1024 * 1024); 684 685 error = hammer2_read_file(ip, uio, seqcount); 686 return (error); 687 } 688 689 static 690 int 691 hammer2_vop_write(struct vop_write_args *ap) 692 { 693 hammer2_mount_t *hmp; 694 hammer2_inode_t *ip; 695 hammer2_trans_t trans; 696 hammer2_chain_t *parent; 697 thread_t td; 698 struct vnode *vp; 699 struct uio *uio; 700 int error; 701 int seqcount; 702 int bigwrite; 703 704 /* 705 * Read operations supported on this vnode? 706 */ 707 vp = ap->a_vp; 708 if (vp->v_type != VREG) 709 return (EINVAL); 710 711 /* 712 * Misc 713 */ 714 ip = VTOI(vp); 715 hmp = ip->hmp; 716 uio = ap->a_uio; 717 error = 0; 718 if (hmp->ronly) 719 return (EROFS); 720 721 seqcount = ap->a_ioflag >> 16; 722 bigwrite = (uio->uio_resid > 100 * 1024 * 1024); 723 724 /* 725 * Check resource limit 726 */ 727 if (uio->uio_resid > 0 && (td = uio->uio_td) != NULL && td->td_proc && 728 uio->uio_offset + uio->uio_resid > 729 td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 730 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ); 731 return (EFBIG); 732 } 733 734 bigwrite = (uio->uio_resid > 100 * 1024 * 1024); 735 736 /* 737 * ip must be locked if extending the file. 738 * ip must be locked to avoid racing a truncation. 739 * 740 * ip must be marked modified, particularly because the write 741 * might wind up being copied into the embedded data area. 742 */ 743 hammer2_trans_init(ip->hmp, &trans, 0); 744 parent = hammer2_inode_lock_ex(ip); 745 error = hammer2_write_file(&trans, ip, &parent, 746 uio, ap->a_ioflag, seqcount); 747 hammer2_inode_unlock_ex(ip, parent); 748 hammer2_trans_done(&trans); 749 750 return (error); 751 } 752 753 /* 754 * Perform read operations on a file or symlink given an UNLOCKED 755 * inode and uio. 756 * 757 * The passed ip is not locked. 758 */ 759 static 760 int 761 hammer2_read_file(hammer2_inode_t *ip, struct uio *uio, int seqcount) 762 { 763 hammer2_off_t size; 764 hammer2_chain_t *parent; 765 struct buf *bp; 766 int error; 767 768 error = 0; 769 770 /* 771 * UIO read loop. 772 */ 773 parent = hammer2_inode_lock_sh(ip); 774 size = ip->chain->data->ipdata.size; 775 776 while (uio->uio_resid > 0 && uio->uio_offset < size) { 777 hammer2_key_t lbase; 778 hammer2_key_t leof; 779 int lblksize; 780 int loff; 781 int n; 782 783 lblksize = hammer2_calc_logical(ip, uio->uio_offset, 784 &lbase, &leof); 785 786 error = cluster_read(ip->vp, leof, lbase, lblksize, 787 uio->uio_resid, seqcount * BKVASIZE, 788 &bp); 789 790 if (error) 791 break; 792 loff = (int)(uio->uio_offset - lbase); 793 n = lblksize - loff; 794 if (n > uio->uio_resid) 795 n = uio->uio_resid; 796 if (n > size - uio->uio_offset) 797 n = (int)(size - uio->uio_offset); 798 bp->b_flags |= B_AGE; 799 uiomove((char *)bp->b_data + loff, n, uio); 800 bqrelse(bp); 801 } 802 hammer2_inode_unlock_sh(ip, parent); 803 return (error); 804 } 805 806 /* 807 * Called with a locked (ip) to do the underlying write to a file or 808 * to build the symlink target. 809 */ 810 static 811 int 812 hammer2_write_file(hammer2_trans_t *trans, hammer2_inode_t *ip, 813 hammer2_chain_t **parentp, 814 struct uio *uio, int ioflag, int seqcount) 815 { 816 hammer2_inode_data_t *ipdata; 817 hammer2_key_t old_eof; 818 struct buf *bp; 819 int kflags; 820 int error; 821 int modified = 0; 822 823 /* 824 * Setup if append 825 */ 826 ipdata = &ip->chain->data->ipdata; 827 if (ioflag & IO_APPEND) 828 uio->uio_offset = ipdata->size; 829 kflags = 0; 830 error = 0; 831 832 /* 833 * vfs_sync visibility. Interlocked by the inode ex lock so we 834 * shouldn't have to reassert it multiple times if the ip->chain 835 * is modified/flushed multiple times during the write, except 836 * when we release/reacquire the inode ex lock. 837 */ 838 atomic_set_int(&ip->flags, HAMMER2_INODE_MODIFIED); 839 840 /* 841 * Extend the file if necessary. If the write fails at some point 842 * we will truncate it back down to cover as much as we were able 843 * to write. 844 * 845 * Doing this now makes it easier to calculate buffer sizes in 846 * the loop. 847 */ 848 KKASSERT(ipdata->type != HAMMER2_OBJTYPE_HARDLINK); 849 old_eof = ipdata->size; 850 if (uio->uio_offset + uio->uio_resid > ipdata->size) { 851 modified = 1; 852 hammer2_extend_file(trans, ip, parentp, 853 uio->uio_offset + uio->uio_resid); 854 ipdata = &ip->chain->data->ipdata; /* RELOAD */ 855 kflags |= NOTE_EXTEND; 856 } 857 KKASSERT(ipdata->type != HAMMER2_OBJTYPE_HARDLINK); 858 859 /* 860 * UIO write loop 861 */ 862 while (uio->uio_resid > 0) { 863 hammer2_key_t lbase; 864 hammer2_key_t leof; 865 int trivial; 866 int lblksize; 867 int loff; 868 int n; 869 870 /* 871 * Don't allow the buffer build to blow out the buffer 872 * cache. 873 */ 874 if ((ioflag & IO_RECURSE) == 0) { 875 /* 876 * XXX should try to leave this unlocked through 877 * the whole loop 878 */ 879 hammer2_inode_unlock_ex(ip, *parentp); 880 bwillwrite(HAMMER2_PBUFSIZE); 881 *parentp = hammer2_inode_lock_ex(ip); 882 atomic_set_int(&ip->flags, HAMMER2_INODE_MODIFIED); 883 ipdata = &ip->chain->data->ipdata; /* reload */ 884 } 885 886 /* XXX bigwrite & signal check test */ 887 888 /* 889 * This nominally tells us how much we can cluster and 890 * what the logical buffer size needs to be. Currently 891 * we don't try to cluster the write and just handle one 892 * block at a time. 893 */ 894 lblksize = hammer2_calc_logical(ip, uio->uio_offset, 895 &lbase, &leof); 896 loff = (int)(uio->uio_offset - lbase); 897 898 /* 899 * Calculate bytes to copy this transfer and whether the 900 * copy completely covers the buffer or not. 901 */ 902 trivial = 0; 903 n = lblksize - loff; 904 if (n > uio->uio_resid) { 905 n = uio->uio_resid; 906 if (loff == lbase && 907 uio->uio_offset + n == ipdata->size) 908 trivial = 1; 909 } else if (loff == 0) { 910 trivial = 1; 911 } 912 913 /* 914 * Get the buffer 915 */ 916 if (uio->uio_segflg == UIO_NOCOPY) { 917 /* 918 * Issuing a write with the same data backing the 919 * buffer. Instantiate the buffer to collect the 920 * backing vm pages, then read-in any missing bits. 921 * 922 * This case is used by vop_stdputpages(). 923 */ 924 bp = getblk(ip->vp, lbase, lblksize, GETBLK_BHEAVY, 0); 925 if ((bp->b_flags & B_CACHE) == 0) { 926 bqrelse(bp); 927 error = bread(ip->vp, lbase, lblksize, &bp); 928 } 929 } else if (trivial) { 930 /* 931 * Even though we are entirely overwriting the buffer 932 * we may still have to zero it out to avoid a 933 * mmap/write visibility issue. 934 */ 935 bp = getblk(ip->vp, lbase, lblksize, GETBLK_BHEAVY, 0); 936 if ((bp->b_flags & B_CACHE) == 0) 937 vfs_bio_clrbuf(bp); 938 } else { 939 /* 940 * Partial overwrite, read in any missing bits then 941 * replace the portion being written. 942 * 943 * (The strategy code will detect zero-fill physical 944 * blocks for this case). 945 */ 946 error = bread(ip->vp, lbase, lblksize, &bp); 947 if (error == 0) 948 bheavy(bp); 949 } 950 951 if (error) { 952 brelse(bp); 953 break; 954 } 955 956 /* 957 * We have to assign physical storage to the buffer we intend 958 * to dirty or write now to avoid deadlocks in the strategy 959 * code later. 960 * 961 * This can return NOOFFSET for inode-embedded data. The 962 * strategy code will take care of it in that case. 963 */ 964 bp->b_bio2.bio_offset = 965 hammer2_assign_physical(trans, ip, parentp, 966 lbase, lblksize, &error); 967 ipdata = &ip->chain->data->ipdata; /* RELOAD */ 968 if (error) { 969 brelse(bp); 970 break; 971 } 972 973 /* 974 * Ok, copy the data in 975 */ 976 hammer2_inode_unlock_ex(ip, *parentp); 977 error = uiomove(bp->b_data + loff, n, uio); 978 *parentp = hammer2_inode_lock_ex(ip); 979 atomic_set_int(&ip->flags, HAMMER2_INODE_MODIFIED); 980 ipdata = &ip->chain->data->ipdata; /* reload */ 981 kflags |= NOTE_WRITE; 982 modified = 1; 983 984 if (error) { 985 brelse(bp); 986 break; 987 } 988 989 /* XXX update ip_data.mtime */ 990 991 /* 992 * Once we dirty a buffer any cached offset becomes invalid. 993 * 994 * NOTE: For cluster_write() always use the trailing block 995 * size, which is HAMMER2_PBUFSIZE. lblksize is the 996 * eof-straddling blocksize and is incorrect. 997 */ 998 bp->b_flags |= B_AGE; 999 if (lbase == 0 && (ipdata->op_flags & 1000 HAMMER2_OPFLAG_DIRECTDATA)) { 1001 /* 1002 * Writing to the inode's embedded data must be 1003 * synchronous because the strategy code isn't 1004 * allowed to acquire chain locks. 1005 * 1006 * Deal with chain interactions here. 1007 */ 1008 ipdata = hammer2_chain_modify_ip(trans, ip, parentp, 0); 1009 bwrite(bp); 1010 } else if (ioflag & IO_SYNC) { 1011 /* 1012 * Synchronous I/O requested. 1013 */ 1014 bwrite(bp); 1015 } else if ((ioflag & IO_DIRECT) && loff + n == lblksize) { 1016 if (bp->b_bcount == HAMMER2_PBUFSIZE) 1017 bp->b_flags |= B_CLUSTEROK; 1018 bdwrite(bp); 1019 } else if (ioflag & IO_ASYNC) { 1020 bawrite(bp); 1021 } else if (hammer2_cluster_enable) { 1022 if (bp->b_bcount == HAMMER2_PBUFSIZE) 1023 bp->b_flags |= B_CLUSTEROK; 1024 cluster_write(bp, leof, HAMMER2_PBUFSIZE, seqcount); 1025 } else { 1026 if (bp->b_bcount == HAMMER2_PBUFSIZE) 1027 bp->b_flags |= B_CLUSTEROK; 1028 bdwrite(bp); 1029 } 1030 } 1031 1032 /* 1033 * Cleanup. If we extended the file EOF but failed to write through 1034 * the entire write is a failure and we have to back-up. 1035 */ 1036 if (error && ipdata->size != old_eof) { 1037 hammer2_truncate_file(trans, ip, parentp, old_eof); 1038 ipdata = &ip->chain->data->ipdata; /* RELOAD */ 1039 } else if (modified) { 1040 ipdata = hammer2_chain_modify_ip(trans, ip, parentp, 0); 1041 hammer2_update_time(&ipdata->mtime); 1042 } 1043 hammer2_knote(ip->vp, kflags); 1044 1045 return error; 1046 } 1047 1048 /* 1049 * Assign physical storage to a logical block. This function creates the 1050 * related meta-data chains representing the data blocks and marks them 1051 * MODIFIED. We could mark them MOVED instead but ultimately I need to 1052 * XXX code the flusher to check that the related logical buffer is 1053 * flushed. 1054 * 1055 * NOOFFSET is returned if the data is inode-embedded. In this case the 1056 * strategy code will simply bcopy() the data into the inode. 1057 * 1058 * The inode's delta_dcount is adjusted. 1059 */ 1060 static 1061 hammer2_off_t 1062 hammer2_assign_physical(hammer2_trans_t *trans, hammer2_inode_t *ip, 1063 hammer2_chain_t **parentp, 1064 hammer2_key_t lbase, int lblksize, int *errorp) 1065 { 1066 hammer2_mount_t *hmp; 1067 hammer2_chain_t *parent; 1068 hammer2_chain_t *chain; 1069 hammer2_off_t pbase; 1070 1071 /* 1072 * Locate the chain associated with lbase, return a locked chain. 1073 * However, do not instantiate any data reference (which utilizes a 1074 * device buffer) because we will be using direct IO via the 1075 * logical buffer cache buffer. 1076 */ 1077 hmp = ip->hmp; 1078 *errorp = 0; 1079 retry: 1080 parent = *parentp; 1081 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); /* extra lock */ 1082 chain = hammer2_chain_lookup(&parent, 1083 lbase, lbase, 1084 HAMMER2_LOOKUP_NODATA); 1085 1086 if (chain == NULL) { 1087 /* 1088 * We found a hole, create a new chain entry. 1089 * 1090 * NOTE: DATA chains are created without device backing 1091 * store (nor do we want any). 1092 */ 1093 *errorp = hammer2_chain_create(trans, &parent, &chain, 1094 lbase, HAMMER2_PBUFRADIX, 1095 HAMMER2_BREF_TYPE_DATA, 1096 lblksize); 1097 if (chain == NULL) { 1098 hammer2_chain_lookup_done(parent); 1099 panic("hammer2_chain_create: par=%p error=%d\n", 1100 parent, *errorp); 1101 goto retry; 1102 } 1103 1104 pbase = chain->bref.data_off & ~HAMMER2_OFF_MASK_RADIX; 1105 /*ip->delta_dcount += lblksize;*/ 1106 } else { 1107 switch (chain->bref.type) { 1108 case HAMMER2_BREF_TYPE_INODE: 1109 /* 1110 * The data is embedded in the inode. The 1111 * caller is responsible for marking the inode 1112 * modified and copying the data to the embedded 1113 * area. 1114 */ 1115 pbase = NOOFFSET; 1116 break; 1117 case HAMMER2_BREF_TYPE_DATA: 1118 if (chain->bytes != lblksize) { 1119 panic("hammer2_assign_physical: " 1120 "size mismatch %d/%d\n", 1121 lblksize, chain->bytes); 1122 } 1123 hammer2_chain_modify(trans, &chain, 1124 HAMMER2_MODIFY_OPTDATA); 1125 pbase = chain->bref.data_off & ~HAMMER2_OFF_MASK_RADIX; 1126 break; 1127 default: 1128 panic("hammer2_assign_physical: bad type"); 1129 /* NOT REACHED */ 1130 pbase = NOOFFSET; 1131 break; 1132 } 1133 } 1134 1135 /* 1136 * Cleanup. If chain wound up being the inode (i.e. DIRECTDATA), 1137 * we might have to replace *parentp. 1138 */ 1139 hammer2_chain_lookup_done(parent); 1140 if (chain) { 1141 if (*parentp != chain && 1142 (*parentp)->core == chain->core) { 1143 parent = *parentp; 1144 *parentp = chain; 1145 hammer2_chain_unlock(parent); 1146 } else { 1147 hammer2_chain_unlock(chain); 1148 } 1149 } 1150 1151 return (pbase); 1152 } 1153 1154 /* 1155 * Truncate the size of a file. 1156 * 1157 * This routine adjusts ipdata->size smaller, destroying any related 1158 * data beyond the new EOF and potentially resizing the block straddling 1159 * the EOF. 1160 * 1161 * The inode must be locked. 1162 */ 1163 static 1164 void 1165 hammer2_truncate_file(hammer2_trans_t *trans, hammer2_inode_t *ip, 1166 hammer2_chain_t **parentp, hammer2_key_t nsize) 1167 { 1168 hammer2_inode_data_t *ipdata; 1169 hammer2_chain_t *parent; 1170 hammer2_chain_t *chain; 1171 hammer2_key_t lbase; 1172 hammer2_key_t leof; 1173 struct buf *bp; 1174 int loff; 1175 int error; 1176 int oblksize; 1177 int nblksize; 1178 1179 bp = NULL; 1180 error = 0; 1181 ipdata = hammer2_chain_modify_ip(trans, ip, parentp, 0); 1182 1183 /* 1184 * Destroy any logical buffer cache buffers beyond the file EOF. 1185 * 1186 * We call nvtruncbuf() w/ trivial == 1 to prevent it from messing 1187 * around with the buffer straddling EOF, because we need to assign 1188 * a new physical offset to it. 1189 */ 1190 if (ip->vp) { 1191 nvtruncbuf(ip->vp, nsize, 1192 HAMMER2_PBUFSIZE, (int)nsize & HAMMER2_PBUFMASK, 1193 1); 1194 } 1195 1196 /* 1197 * Setup for lookup/search 1198 */ 1199 parent = hammer2_chain_lookup_init(ip->chain, 0); 1200 1201 /* 1202 * Handle the case where a chain/logical-buffer straddles the new 1203 * EOF. We told nvtruncbuf() above not to mess with the logical 1204 * buffer straddling the EOF because we need to reassign its storage 1205 * and can't let the strategy code do it for us. 1206 */ 1207 loff = (int)nsize & HAMMER2_PBUFMASK; 1208 if (loff && ip->vp) { 1209 oblksize = hammer2_calc_logical(ip, nsize, &lbase, &leof); 1210 error = bread(ip->vp, lbase, oblksize, &bp); 1211 KKASSERT(error == 0); 1212 } 1213 ipdata->size = nsize; 1214 nblksize = hammer2_calc_logical(ip, nsize, &lbase, &leof); 1215 1216 /* 1217 * Fixup the chain element. If we have a logical buffer in-hand 1218 * we don't want to create a conflicting device buffer. 1219 */ 1220 if (loff && bp) { 1221 chain = hammer2_chain_lookup(&parent, lbase, lbase, 1222 HAMMER2_LOOKUP_NODATA); 1223 if (chain) { 1224 switch(chain->bref.type) { 1225 case HAMMER2_BREF_TYPE_DATA: 1226 hammer2_chain_resize(trans, ip, bp, 1227 parent, &chain, 1228 hammer2_allocsize(nblksize), 1229 HAMMER2_MODIFY_OPTDATA); 1230 allocbuf(bp, nblksize); 1231 bzero(bp->b_data + loff, nblksize - loff); 1232 bp->b_bio2.bio_offset = chain->bref.data_off & 1233 HAMMER2_OFF_MASK; 1234 break; 1235 case HAMMER2_BREF_TYPE_INODE: 1236 allocbuf(bp, nblksize); 1237 bzero(bp->b_data + loff, nblksize - loff); 1238 bp->b_bio2.bio_offset = NOOFFSET; 1239 break; 1240 default: 1241 panic("hammer2_truncate_file: bad type"); 1242 break; 1243 } 1244 hammer2_chain_unlock(chain); 1245 if (lbase == 0 && 1246 (ipdata->op_flags & HAMMER2_OPFLAG_DIRECTDATA)) { 1247 /* 1248 * Must be synchronous if writing to the 1249 * inode's embedded data area. 1250 */ 1251 bwrite(bp); 1252 } else { 1253 /* 1254 * Else a delayed-write is fine. 1255 */ 1256 if (bp->b_bcount == HAMMER2_PBUFSIZE) 1257 bp->b_flags |= B_CLUSTEROK; 1258 bdwrite(bp); 1259 } 1260 } else { 1261 /* 1262 * Destroy clean buffer w/ wrong buffer size. Retain 1263 * backing store. 1264 */ 1265 bp->b_flags |= B_RELBUF; 1266 KKASSERT(bp->b_bio2.bio_offset == NOOFFSET); 1267 KKASSERT((bp->b_flags & B_DIRTY) == 0); 1268 bqrelse(bp); 1269 } 1270 } else if (loff) { 1271 /* 1272 * WARNING: This utilizes a device buffer for the data. 1273 * 1274 * This case should not occur because file truncations without 1275 * a vnode (and hence no logical buffer cache) should only 1276 * always truncate to 0-length. 1277 */ 1278 panic("hammer2_truncate_file: non-zero truncation, no-vnode"); 1279 #if 0 1280 chain = hammer2_chain_lookup(&parent, lbase, lbase, 0); 1281 if (chain) { 1282 switch(chain->bref.type) { 1283 case HAMMER2_BREF_TYPE_DATA: 1284 chain = hammer2_chain_resize(trans, ip, bp, 1285 parent, chain, 1286 hammer2_allocsize(nblksize), 1287 0); 1288 hammer2_chain_modify(hmp, &chain, 0); 1289 bzero(chain->data->buf + loff, nblksize - loff); 1290 break; 1291 case HAMMER2_BREF_TYPE_INODE: 1292 if (loff < HAMMER2_EMBEDDED_BYTES) { 1293 hammer2_chain_modify(hmp, &chain, 0); 1294 bzero(chain->data->ipdata.u.data + loff, 1295 HAMMER2_EMBEDDED_BYTES - loff); 1296 } 1297 break; 1298 } 1299 hammer2_chain_unlock(chain); 1300 } 1301 #endif 1302 } 1303 1304 /* 1305 * Clean up any fragmentory VM pages now that we have properly 1306 * resized the straddling buffer. These pages are no longer 1307 * part of the buffer. 1308 */ 1309 if (ip->vp) { 1310 nvtruncbuf(ip->vp, nsize, 1311 nblksize, (int)nsize & (nblksize - 1), 1312 1); 1313 } 1314 1315 /* 1316 * Destroy any physical blocks after the new EOF point. 1317 */ 1318 lbase = (nsize + HAMMER2_PBUFMASK64) & ~HAMMER2_PBUFMASK64; 1319 chain = hammer2_chain_lookup(&parent, 1320 lbase, (hammer2_key_t)-1, 1321 HAMMER2_LOOKUP_NODATA); 1322 while (chain) { 1323 /* 1324 * Degenerate embedded data case, nothing to loop on. 1325 */ 1326 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE) { 1327 hammer2_chain_unlock(chain); 1328 break; 1329 } 1330 1331 /* 1332 * Delete physical data blocks past the file EOF. 1333 */ 1334 if (chain->bref.type == HAMMER2_BREF_TYPE_DATA) { 1335 /*ip->delta_dcount -= chain->bytes;*/ 1336 hammer2_chain_delete(trans, chain); 1337 } 1338 /* XXX check parent if empty indirect block & delete */ 1339 chain = hammer2_chain_next(&parent, chain, 1340 lbase, (hammer2_key_t)-1, 1341 HAMMER2_LOOKUP_NODATA); 1342 } 1343 hammer2_chain_lookup_done(parent); 1344 } 1345 1346 /* 1347 * Extend the size of a file. The inode must be locked. 1348 * 1349 * We may have to resize the block straddling the old EOF. 1350 */ 1351 static 1352 void 1353 hammer2_extend_file(hammer2_trans_t *trans, hammer2_inode_t *ip, 1354 hammer2_chain_t **parentp, hammer2_key_t nsize) 1355 { 1356 hammer2_inode_data_t *ipdata; 1357 hammer2_mount_t *hmp; 1358 hammer2_chain_t *parent; 1359 hammer2_chain_t *chain; 1360 struct buf *bp; 1361 hammer2_key_t osize; 1362 hammer2_key_t obase; 1363 hammer2_key_t nbase; 1364 hammer2_key_t leof; 1365 int oblksize; 1366 int nblksize; 1367 int nradix; 1368 int error; 1369 1370 KKASSERT(ip->vp); 1371 hmp = ip->hmp; 1372 1373 ipdata = hammer2_chain_modify_ip(trans, ip, parentp, 0); 1374 1375 /* 1376 * Nothing to do if the direct-data case is still intact 1377 */ 1378 if ((ipdata->op_flags & HAMMER2_OPFLAG_DIRECTDATA) && 1379 nsize <= HAMMER2_EMBEDDED_BYTES) { 1380 ipdata->size = nsize; 1381 nvextendbuf(ip->vp, 1382 ipdata->size, nsize, 1383 0, HAMMER2_EMBEDDED_BYTES, 1384 0, (int)nsize, 1385 1); 1386 /* ipdata = &ip->chain->data->ipdata; RELOAD */ 1387 return; 1388 } 1389 1390 /* 1391 * Calculate the blocksize at the original EOF and resize the block 1392 * if necessary. Adjust the file size in the inode. 1393 */ 1394 osize = ipdata->size; 1395 oblksize = hammer2_calc_logical(ip, osize, &obase, &leof); 1396 ipdata->size = nsize; 1397 nblksize = hammer2_calc_logical(ip, osize, &nbase, &leof); 1398 1399 /* 1400 * Do all required vnode operations, but do not mess with the 1401 * buffer straddling the orignal EOF. 1402 */ 1403 nvextendbuf(ip->vp, 1404 ipdata->size, nsize, 1405 0, nblksize, 1406 0, (int)nsize & HAMMER2_PBUFMASK, 1407 1); 1408 ipdata = &ip->chain->data->ipdata; 1409 1410 /* 1411 * Early return if we have no more work to do. 1412 */ 1413 if (obase == nbase && oblksize == nblksize && 1414 (ipdata->op_flags & HAMMER2_OPFLAG_DIRECTDATA) == 0) { 1415 return; 1416 } 1417 1418 /* 1419 * We have work to do, including possibly resizing the buffer 1420 * at the previous EOF point and turning off DIRECTDATA mode. 1421 */ 1422 bp = NULL; 1423 if (((int)osize & HAMMER2_PBUFMASK)) { 1424 error = bread(ip->vp, obase, oblksize, &bp); 1425 KKASSERT(error == 0); 1426 } 1427 1428 /* 1429 * Disable direct-data mode by loading up a buffer cache buffer 1430 * with the data, then converting the inode data area into the 1431 * inode indirect block array area. 1432 */ 1433 if (ipdata->op_flags & HAMMER2_OPFLAG_DIRECTDATA) { 1434 ipdata->op_flags &= ~HAMMER2_OPFLAG_DIRECTDATA; 1435 bzero(&ipdata->u.blockset, sizeof(ipdata->u.blockset)); 1436 } 1437 1438 /* 1439 * Resize the chain element at the old EOF. 1440 */ 1441 if (((int)osize & HAMMER2_PBUFMASK)) { 1442 retry: 1443 error = 0; 1444 parent = hammer2_chain_lookup_init(ip->chain, 0); 1445 nradix = hammer2_allocsize(nblksize); 1446 1447 chain = hammer2_chain_lookup(&parent, 1448 obase, obase, 1449 HAMMER2_LOOKUP_NODATA); 1450 if (chain == NULL) { 1451 error = hammer2_chain_create(trans, &parent, &chain, 1452 obase, nblksize, 1453 HAMMER2_BREF_TYPE_DATA, 1454 nblksize); 1455 if (chain == NULL) { 1456 hammer2_chain_lookup_done(parent); 1457 panic("hammer2_chain_create: par=%p error=%d\n", 1458 parent, error); 1459 goto retry; 1460 } 1461 /*ip->delta_dcount += nblksize;*/ 1462 } else { 1463 KKASSERT(chain->bref.type == HAMMER2_BREF_TYPE_DATA); 1464 hammer2_chain_resize(trans, ip, bp, 1465 parent, &chain, 1466 nradix, 1467 HAMMER2_MODIFY_OPTDATA); 1468 } 1469 if (obase != nbase) { 1470 if (oblksize != HAMMER2_PBUFSIZE) 1471 allocbuf(bp, HAMMER2_PBUFSIZE); 1472 } else { 1473 if (oblksize != nblksize) 1474 allocbuf(bp, nblksize); 1475 } 1476 bp->b_bio2.bio_offset = chain->bref.data_off & 1477 HAMMER2_OFF_MASK; 1478 hammer2_chain_unlock(chain); 1479 if (bp->b_bcount == HAMMER2_PBUFSIZE) 1480 bp->b_flags |= B_CLUSTEROK; 1481 bdwrite(bp); 1482 hammer2_chain_lookup_done(parent); /* must be after bdwrite */ 1483 } 1484 } 1485 1486 static 1487 int 1488 hammer2_vop_nresolve(struct vop_nresolve_args *ap) 1489 { 1490 hammer2_inode_t *ip; 1491 hammer2_inode_t *dip; 1492 hammer2_mount_t *hmp; 1493 hammer2_chain_t *parent; 1494 hammer2_chain_t *chain; 1495 hammer2_chain_t *ochain; 1496 hammer2_trans_t trans; 1497 struct namecache *ncp; 1498 const uint8_t *name; 1499 size_t name_len; 1500 hammer2_key_t lhc; 1501 int error = 0; 1502 struct vnode *vp; 1503 1504 dip = VTOI(ap->a_dvp); 1505 hmp = dip->hmp; 1506 ncp = ap->a_nch->ncp; 1507 name = ncp->nc_name; 1508 name_len = ncp->nc_nlen; 1509 lhc = hammer2_dirhash(name, name_len); 1510 1511 /* 1512 * Note: In DragonFly the kernel handles '.' and '..'. 1513 */ 1514 parent = hammer2_inode_lock_sh(dip); 1515 chain = hammer2_chain_lookup(&parent, 1516 lhc, lhc + HAMMER2_DIRHASH_LOMASK, 1517 HAMMER2_LOOKUP_SHARED); 1518 while (chain) { 1519 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && 1520 name_len == chain->data->ipdata.name_len && 1521 bcmp(name, chain->data->ipdata.filename, name_len) == 0) { 1522 break; 1523 } 1524 chain = hammer2_chain_next(&parent, chain, 1525 lhc, lhc + HAMMER2_DIRHASH_LOMASK, 1526 HAMMER2_LOOKUP_SHARED); 1527 } 1528 hammer2_inode_unlock_sh(dip, parent); 1529 1530 /* 1531 * If the inode represents a forwarding entry for a hardlink we have 1532 * to locate the actual inode. The original ip is saved for possible 1533 * deconsolidation. (ip) will only be set to non-NULL when we have 1534 * to locate the real file via a hardlink. ip will be referenced but 1535 * not locked in that situation. chain is passed in locked and 1536 * returned locked. 1537 * 1538 * XXX what kind of chain lock? 1539 */ 1540 ochain = NULL; 1541 if (chain && chain->data->ipdata.type == HAMMER2_OBJTYPE_HARDLINK) { 1542 error = hammer2_hardlink_find(dip, &chain, &ochain); 1543 if (error) { 1544 kprintf("hammer2: unable to find hardlink\n"); 1545 if (chain) { 1546 hammer2_chain_unlock(chain); 1547 chain = NULL; 1548 } 1549 goto failed; 1550 } 1551 } 1552 1553 /* 1554 * Deconsolidate any hardlink whos nlinks == 1. Ignore errors. 1555 * If an error occurs chain and ip are left alone. 1556 * 1557 * XXX upgrade shared lock? 1558 */ 1559 if (ochain && chain && chain->data->ipdata.nlinks == 1 && !hmp->ronly) { 1560 kprintf("hammer2: need to unconsolidate hardlink for %s\n", 1561 chain->data->ipdata.filename); 1562 /* XXX retain shared lock on dip? (currently not held) */ 1563 hammer2_trans_init(dip->hmp, &trans, 0); 1564 hammer2_hardlink_deconsolidate(&trans, dip, &chain, &ochain); 1565 hammer2_trans_done(&trans); 1566 } 1567 1568 /* 1569 * Acquire the related vnode 1570 * 1571 * NOTE: For error processing, only ENOENT resolves the namecache 1572 * entry to NULL, otherwise we just return the error and 1573 * leave the namecache unresolved. 1574 * 1575 * NOTE: multiple hammer2_inode structures can be aliased to the 1576 * same chain element, for example for hardlinks. This 1577 * use case does not 'reattach' inode associations that 1578 * might already exist, but always allocates a new one. 1579 * 1580 * WARNING: inode structure is locked exclusively via inode_get 1581 * but chain was locked shared. inode_unlock_ex() 1582 * will handle it properly. 1583 */ 1584 if (chain) { 1585 ip = hammer2_inode_get(hmp, dip->pmp, dip, chain); 1586 vp = hammer2_igetv(ip, &error); 1587 if (error == 0) { 1588 vn_unlock(vp); 1589 cache_setvp(ap->a_nch, vp); 1590 } else if (error == ENOENT) { 1591 cache_setvp(ap->a_nch, NULL); 1592 } 1593 hammer2_inode_unlock_ex(ip, chain); 1594 1595 /* 1596 * The vp should not be released until after we've disposed 1597 * of our locks, because it might cause vop_inactive() to 1598 * be called. 1599 */ 1600 if (vp) 1601 vrele(vp); 1602 } else { 1603 error = ENOENT; 1604 cache_setvp(ap->a_nch, NULL); 1605 } 1606 failed: 1607 KASSERT(error || ap->a_nch->ncp->nc_vp != NULL, 1608 ("resolve error %d/%p chain %p ap %p\n", 1609 error, ap->a_nch->ncp->nc_vp, chain, ap)); 1610 if (ochain) 1611 hammer2_chain_drop(ochain); 1612 return error; 1613 } 1614 1615 static 1616 int 1617 hammer2_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap) 1618 { 1619 hammer2_inode_t *dip; 1620 hammer2_inode_t *ip; 1621 hammer2_mount_t *hmp; 1622 hammer2_chain_t *parent; 1623 int error; 1624 1625 dip = VTOI(ap->a_dvp); 1626 hmp = dip->hmp; 1627 1628 if ((ip = dip->pip) == NULL) { 1629 *ap->a_vpp = NULL; 1630 return ENOENT; 1631 } 1632 parent = hammer2_inode_lock_ex(ip); 1633 *ap->a_vpp = hammer2_igetv(ip, &error); 1634 hammer2_inode_unlock_ex(ip, parent); 1635 1636 return error; 1637 } 1638 1639 static 1640 int 1641 hammer2_vop_nmkdir(struct vop_nmkdir_args *ap) 1642 { 1643 hammer2_mount_t *hmp; 1644 hammer2_inode_t *dip; 1645 hammer2_inode_t *nip; 1646 hammer2_trans_t trans; 1647 hammer2_chain_t *chain; 1648 struct namecache *ncp; 1649 const uint8_t *name; 1650 size_t name_len; 1651 int error; 1652 1653 dip = VTOI(ap->a_dvp); 1654 hmp = dip->hmp; 1655 if (hmp->ronly) 1656 return (EROFS); 1657 1658 ncp = ap->a_nch->ncp; 1659 name = ncp->nc_name; 1660 name_len = ncp->nc_nlen; 1661 1662 hammer2_trans_init(hmp, &trans, 0); 1663 nip = hammer2_inode_create(&trans, dip, ap->a_vap, ap->a_cred, 1664 name, name_len, &chain, &error); 1665 if (error) { 1666 KKASSERT(nip == NULL); 1667 *ap->a_vpp = NULL; 1668 } else { 1669 *ap->a_vpp = hammer2_igetv(nip, &error); 1670 hammer2_inode_unlock_ex(nip, chain); 1671 } 1672 hammer2_trans_done(&trans); 1673 1674 if (error == 0) { 1675 cache_setunresolved(ap->a_nch); 1676 cache_setvp(ap->a_nch, *ap->a_vpp); 1677 } 1678 return error; 1679 } 1680 1681 /* 1682 * Return the largest contiguous physical disk range for the logical 1683 * request. 1684 * 1685 * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb) 1686 */ 1687 static 1688 int 1689 hammer2_vop_bmap(struct vop_bmap_args *ap) 1690 { 1691 struct vnode *vp; 1692 hammer2_mount_t *hmp; 1693 hammer2_inode_t *ip; 1694 hammer2_chain_t *parent; 1695 hammer2_chain_t *chain; 1696 hammer2_key_t lbeg; 1697 hammer2_key_t lend; 1698 hammer2_off_t pbeg; 1699 hammer2_off_t pbytes; 1700 hammer2_off_t array[HAMMER2_BMAP_COUNT][2]; 1701 int loff; 1702 int ai; 1703 1704 /* 1705 * Only supported on regular files 1706 * 1707 * Only supported for read operations (required for cluster_read). 1708 * The block allocation is delayed for write operations. 1709 */ 1710 vp = ap->a_vp; 1711 if (vp->v_type != VREG) 1712 return (EOPNOTSUPP); 1713 if (ap->a_cmd != BUF_CMD_READ) 1714 return (EOPNOTSUPP); 1715 1716 ip = VTOI(vp); 1717 hmp = ip->hmp; 1718 bzero(array, sizeof(array)); 1719 1720 /* 1721 * Calculate logical range 1722 */ 1723 KKASSERT((ap->a_loffset & HAMMER2_LBUFMASK64) == 0); 1724 lbeg = ap->a_loffset & HAMMER2_OFF_MASK_HI; 1725 lend = lbeg + HAMMER2_BMAP_COUNT * HAMMER2_PBUFSIZE - 1; 1726 if (lend < lbeg) 1727 lend = lbeg; 1728 loff = ap->a_loffset & HAMMER2_OFF_MASK_LO; 1729 1730 parent = hammer2_inode_lock_sh(ip); 1731 chain = hammer2_chain_lookup(&parent, 1732 lbeg, lend, 1733 HAMMER2_LOOKUP_NODATA | 1734 HAMMER2_LOOKUP_SHARED); 1735 if (chain == NULL) { 1736 *ap->a_doffsetp = ZFOFFSET; 1737 hammer2_inode_unlock_sh(ip, parent); 1738 return (0); 1739 } 1740 1741 while (chain) { 1742 if (chain->bref.type == HAMMER2_BREF_TYPE_DATA) { 1743 ai = (chain->bref.key - lbeg) / HAMMER2_PBUFSIZE; 1744 KKASSERT(ai >= 0 && ai < HAMMER2_BMAP_COUNT); 1745 array[ai][0] = chain->bref.data_off & HAMMER2_OFF_MASK; 1746 array[ai][1] = chain->bytes; 1747 } 1748 chain = hammer2_chain_next(&parent, chain, 1749 lbeg, lend, 1750 HAMMER2_LOOKUP_NODATA | 1751 HAMMER2_LOOKUP_SHARED); 1752 } 1753 hammer2_inode_unlock_sh(ip, parent); 1754 1755 /* 1756 * If the requested loffset is not mappable physically we can't 1757 * bmap. The caller will have to access the file data via a 1758 * device buffer. 1759 */ 1760 if (array[0][0] == 0 || array[0][1] < loff + HAMMER2_LBUFSIZE) { 1761 *ap->a_doffsetp = NOOFFSET; 1762 return (0); 1763 } 1764 1765 /* 1766 * Calculate the physical disk offset range for array[0] 1767 */ 1768 pbeg = array[0][0] + loff; 1769 pbytes = array[0][1] - loff; 1770 1771 for (ai = 1; ai < HAMMER2_BMAP_COUNT; ++ai) { 1772 if (array[ai][0] != pbeg + pbytes) 1773 break; 1774 pbytes += array[ai][1]; 1775 } 1776 1777 *ap->a_doffsetp = pbeg; 1778 if (ap->a_runp) 1779 *ap->a_runp = pbytes; 1780 return (0); 1781 } 1782 1783 static 1784 int 1785 hammer2_vop_open(struct vop_open_args *ap) 1786 { 1787 return vop_stdopen(ap); 1788 } 1789 1790 /* 1791 * hammer2_vop_advlock { vp, id, op, fl, flags } 1792 */ 1793 static 1794 int 1795 hammer2_vop_advlock(struct vop_advlock_args *ap) 1796 { 1797 hammer2_inode_t *ip = VTOI(ap->a_vp); 1798 hammer2_chain_t *parent; 1799 hammer2_off_t size; 1800 1801 parent = hammer2_inode_lock_sh(ip); 1802 size = parent->data->ipdata.size; 1803 hammer2_inode_unlock_sh(ip, parent); 1804 return (lf_advlock(ap, &ip->advlock, size)); 1805 } 1806 1807 1808 static 1809 int 1810 hammer2_vop_close(struct vop_close_args *ap) 1811 { 1812 return vop_stdclose(ap); 1813 } 1814 1815 /* 1816 * hammer2_vop_nlink { nch, dvp, vp, cred } 1817 * 1818 * Create a hardlink from (vp) to {dvp, nch}. 1819 */ 1820 static 1821 int 1822 hammer2_vop_nlink(struct vop_nlink_args *ap) 1823 { 1824 hammer2_inode_t *dip; /* target directory to create link in */ 1825 hammer2_inode_t *ip; /* inode we are hardlinking to */ 1826 hammer2_mount_t *hmp; 1827 hammer2_chain_t *chain; 1828 hammer2_trans_t trans; 1829 struct namecache *ncp; 1830 const uint8_t *name; 1831 size_t name_len; 1832 int error; 1833 1834 dip = VTOI(ap->a_dvp); 1835 hmp = dip->hmp; 1836 if (hmp->ronly) 1837 return (EROFS); 1838 1839 ncp = ap->a_nch->ncp; 1840 name = ncp->nc_name; 1841 name_len = ncp->nc_nlen; 1842 hammer2_trans_init(hmp, &trans, 0); 1843 1844 /* 1845 * ip represents the file being hardlinked. The file could be a 1846 * normal file or a hardlink target if it has already been hardlinked. 1847 * If ip is a hardlinked target then ip->pip represents the location 1848 * of the hardlinked target, NOT the location of the hardlink pointer. 1849 * 1850 * Bump nlinks and potentially also create or move the hardlink 1851 * target in the parent directory common to (ip) and (dip). The 1852 * consolidation code can modify ip->chain and ip->pip. The 1853 * returned chain is locked. 1854 */ 1855 ip = VTOI(ap->a_vp); 1856 chain = hammer2_inode_lock_ex(ip); 1857 error = hammer2_hardlink_consolidate(&trans, ip, &chain, dip, 1); 1858 if (error) 1859 goto done; 1860 1861 /* 1862 * Create a directory entry connected to the specified chain. 1863 * The hardlink consolidation code has already adjusted ip->pip 1864 * to the common parent directory containing the actual hardlink 1865 * 1866 * (which may be different from dip where we created our hardlink 1867 * entry. ip->chain always represents the actual hardlink and not 1868 * any of the pointers to the actual hardlink). 1869 */ 1870 error = hammer2_inode_connect(&trans, 1, 1871 dip, &chain, 1872 name, name_len); 1873 if (error == 0) { 1874 cache_setunresolved(ap->a_nch); 1875 cache_setvp(ap->a_nch, ap->a_vp); 1876 } 1877 done: 1878 hammer2_inode_unlock_ex(ip, chain); 1879 hammer2_trans_done(&trans); 1880 1881 return error; 1882 } 1883 1884 /* 1885 * hammer2_vop_ncreate { nch, dvp, vpp, cred, vap } 1886 * 1887 * The operating system has already ensured that the directory entry 1888 * does not exist and done all appropriate namespace locking. 1889 */ 1890 static 1891 int 1892 hammer2_vop_ncreate(struct vop_ncreate_args *ap) 1893 { 1894 hammer2_mount_t *hmp; 1895 hammer2_inode_t *dip; 1896 hammer2_inode_t *nip; 1897 hammer2_trans_t trans; 1898 hammer2_chain_t *nchain; 1899 struct namecache *ncp; 1900 const uint8_t *name; 1901 size_t name_len; 1902 int error; 1903 1904 dip = VTOI(ap->a_dvp); 1905 hmp = dip->hmp; 1906 if (hmp->ronly) 1907 return (EROFS); 1908 1909 ncp = ap->a_nch->ncp; 1910 name = ncp->nc_name; 1911 name_len = ncp->nc_nlen; 1912 hammer2_trans_init(hmp, &trans, 0); 1913 1914 nip = hammer2_inode_create(&trans, dip, ap->a_vap, ap->a_cred, 1915 name, name_len, &nchain, &error); 1916 if (error) { 1917 KKASSERT(nip == NULL); 1918 *ap->a_vpp = NULL; 1919 } else { 1920 *ap->a_vpp = hammer2_igetv(nip, &error); 1921 hammer2_inode_unlock_ex(nip, nchain); 1922 } 1923 hammer2_trans_done(&trans); 1924 1925 if (error == 0) { 1926 cache_setunresolved(ap->a_nch); 1927 cache_setvp(ap->a_nch, *ap->a_vpp); 1928 } 1929 return error; 1930 } 1931 1932 /* 1933 * hammer2_vop_nsymlink { nch, dvp, vpp, cred, vap, target } 1934 */ 1935 static 1936 int 1937 hammer2_vop_nsymlink(struct vop_nsymlink_args *ap) 1938 { 1939 hammer2_mount_t *hmp; 1940 hammer2_inode_t *dip; 1941 hammer2_inode_t *nip; 1942 hammer2_chain_t *nparent; 1943 hammer2_trans_t trans; 1944 struct namecache *ncp; 1945 const uint8_t *name; 1946 size_t name_len; 1947 int error; 1948 1949 dip = VTOI(ap->a_dvp); 1950 hmp = dip->hmp; 1951 if (hmp->ronly) 1952 return (EROFS); 1953 1954 ncp = ap->a_nch->ncp; 1955 name = ncp->nc_name; 1956 name_len = ncp->nc_nlen; 1957 hammer2_trans_init(hmp, &trans, 0); 1958 1959 ap->a_vap->va_type = VLNK; /* enforce type */ 1960 1961 nip = hammer2_inode_create(&trans, dip, ap->a_vap, ap->a_cred, 1962 name, name_len, &nparent, &error); 1963 if (error) { 1964 KKASSERT(nip == NULL); 1965 *ap->a_vpp = NULL; 1966 hammer2_trans_done(&trans); 1967 return error; 1968 } 1969 *ap->a_vpp = hammer2_igetv(nip, &error); 1970 1971 /* 1972 * Build the softlink (~like file data) and finalize the namecache. 1973 */ 1974 if (error == 0) { 1975 size_t bytes; 1976 struct uio auio; 1977 struct iovec aiov; 1978 hammer2_inode_data_t *nipdata; 1979 1980 nipdata = &nip->chain->data->ipdata; 1981 bytes = strlen(ap->a_target); 1982 1983 if (bytes <= HAMMER2_EMBEDDED_BYTES) { 1984 KKASSERT(nipdata->op_flags & 1985 HAMMER2_OPFLAG_DIRECTDATA); 1986 bcopy(ap->a_target, nipdata->u.data, bytes); 1987 nipdata->size = bytes; 1988 } else { 1989 bzero(&auio, sizeof(auio)); 1990 bzero(&aiov, sizeof(aiov)); 1991 auio.uio_iov = &aiov; 1992 auio.uio_segflg = UIO_SYSSPACE; 1993 auio.uio_rw = UIO_WRITE; 1994 auio.uio_resid = bytes; 1995 auio.uio_iovcnt = 1; 1996 auio.uio_td = curthread; 1997 aiov.iov_base = ap->a_target; 1998 aiov.iov_len = bytes; 1999 error = hammer2_write_file(&trans, nip, &nparent, 2000 &auio, IO_APPEND, 0); 2001 nipdata = &nip->chain->data->ipdata; /* RELOAD */ 2002 /* XXX handle error */ 2003 error = 0; 2004 } 2005 } 2006 hammer2_inode_unlock_ex(nip, nparent); 2007 hammer2_trans_done(&trans); 2008 2009 /* 2010 * Finalize namecache 2011 */ 2012 if (error == 0) { 2013 cache_setunresolved(ap->a_nch); 2014 cache_setvp(ap->a_nch, *ap->a_vpp); 2015 /* hammer2_knote(ap->a_dvp, NOTE_WRITE); */ 2016 } 2017 return error; 2018 } 2019 2020 /* 2021 * hammer2_vop_nremove { nch, dvp, cred } 2022 */ 2023 static 2024 int 2025 hammer2_vop_nremove(struct vop_nremove_args *ap) 2026 { 2027 hammer2_inode_t *dip; 2028 hammer2_mount_t *hmp; 2029 hammer2_trans_t trans; 2030 struct namecache *ncp; 2031 const uint8_t *name; 2032 size_t name_len; 2033 int error; 2034 2035 dip = VTOI(ap->a_dvp); 2036 hmp = dip->hmp; 2037 if (hmp->ronly) 2038 return(EROFS); 2039 2040 ncp = ap->a_nch->ncp; 2041 name = ncp->nc_name; 2042 name_len = ncp->nc_nlen; 2043 hammer2_trans_init(hmp, &trans, 0); 2044 error = hammer2_unlink_file(&trans, dip, name, name_len, 0, NULL); 2045 hammer2_trans_done(&trans); 2046 if (error == 0) { 2047 cache_unlink(ap->a_nch); 2048 } 2049 return (error); 2050 } 2051 2052 /* 2053 * hammer2_vop_nrmdir { nch, dvp, cred } 2054 */ 2055 static 2056 int 2057 hammer2_vop_nrmdir(struct vop_nrmdir_args *ap) 2058 { 2059 hammer2_inode_t *dip; 2060 hammer2_mount_t *hmp; 2061 hammer2_trans_t trans; 2062 struct namecache *ncp; 2063 const uint8_t *name; 2064 size_t name_len; 2065 int error; 2066 2067 dip = VTOI(ap->a_dvp); 2068 hmp = dip->hmp; 2069 if (hmp->ronly) 2070 return(EROFS); 2071 2072 ncp = ap->a_nch->ncp; 2073 name = ncp->nc_name; 2074 name_len = ncp->nc_nlen; 2075 2076 hammer2_trans_init(hmp, &trans, 0); 2077 error = hammer2_unlink_file(&trans, dip, name, name_len, 1, NULL); 2078 hammer2_trans_done(&trans); 2079 if (error == 0) { 2080 cache_unlink(ap->a_nch); 2081 } 2082 return (error); 2083 } 2084 2085 /* 2086 * hammer2_vop_nrename { fnch, tnch, fdvp, tdvp, cred } 2087 */ 2088 static 2089 int 2090 hammer2_vop_nrename(struct vop_nrename_args *ap) 2091 { 2092 struct namecache *fncp; 2093 struct namecache *tncp; 2094 hammer2_inode_t *fdip; 2095 hammer2_inode_t *tdip; 2096 hammer2_inode_t *ip; 2097 hammer2_chain_t *chain; 2098 hammer2_mount_t *hmp; 2099 hammer2_trans_t trans; 2100 const uint8_t *fname; 2101 size_t fname_len; 2102 const uint8_t *tname; 2103 size_t tname_len; 2104 int error; 2105 int hlink; 2106 2107 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount) 2108 return(EXDEV); 2109 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount) 2110 return(EXDEV); 2111 2112 fdip = VTOI(ap->a_fdvp); /* source directory */ 2113 tdip = VTOI(ap->a_tdvp); /* target directory */ 2114 2115 hmp = fdip->hmp; /* check read-only filesystem */ 2116 if (hmp->ronly) 2117 return(EROFS); 2118 2119 fncp = ap->a_fnch->ncp; /* entry name in source */ 2120 fname = fncp->nc_name; 2121 fname_len = fncp->nc_nlen; 2122 2123 tncp = ap->a_tnch->ncp; /* entry name in target */ 2124 tname = tncp->nc_name; 2125 tname_len = tncp->nc_nlen; 2126 2127 hammer2_trans_init(hmp, &trans, 0); 2128 2129 /* 2130 * ip is the inode being renamed. If this is a hardlink then 2131 * ip represents the actual file and not the hardlink marker. 2132 */ 2133 ip = VTOI(fncp->nc_vp); 2134 chain = NULL; 2135 2136 /* 2137 * Keep a tight grip on the inode so the temporary unlinking from 2138 * the source location prior to linking to the target location 2139 * does not cause the chain to be destroyed. 2140 * 2141 * NOTE: To avoid deadlocks we cannot lock (ip) while we are 2142 * unlinking elements from their directories. Locking 2143 * the nlinks field does not lock the whole inode. 2144 */ 2145 hammer2_inode_ref(ip); 2146 2147 /* 2148 * Remove target if it exists 2149 */ 2150 error = hammer2_unlink_file(&trans, tdip, tname, tname_len, -1, NULL); 2151 if (error && error != ENOENT) 2152 goto done; 2153 cache_setunresolved(ap->a_tnch); 2154 2155 /* 2156 * When renaming a hardlinked file we may have to re-consolidate 2157 * the location of the hardlink target. Since the element is simply 2158 * being moved, nlinks is not modified in this case. 2159 * 2160 * If ip represents a regular file the consolidation code essentially 2161 * does nothing other than return the same locked chain that was 2162 * passed in. 2163 * 2164 * The returned chain will be locked. 2165 * 2166 * WARNING! We do not currently have a local copy of ipdata but 2167 * we do use one later remember that it must be reloaded 2168 * on any modification to the inode, including connects. 2169 */ 2170 chain = hammer2_inode_lock_ex(ip); 2171 error = hammer2_hardlink_consolidate(&trans, ip, &chain, tdip, 0); 2172 if (error) 2173 goto done; 2174 2175 /* 2176 * Disconnect (fdip, fname) from the source directory. This will 2177 * disconnect (ip) if it represents a direct file. If (ip) represents 2178 * a hardlink the HARDLINK pointer object will be removed but the 2179 * hardlink will stay intact. 2180 * 2181 * The target chain may be marked DELETED but will not be destroyed 2182 * since we retain our hold on ip and chain. 2183 */ 2184 error = hammer2_unlink_file(&trans, fdip, fname, fname_len, -1, &hlink); 2185 KKASSERT(error != EAGAIN); 2186 if (error) 2187 goto done; 2188 2189 /* 2190 * Reconnect ip to target directory using chain. Chains cannot 2191 * actually be moved, so this will duplicate the chain in the new 2192 * spot and assign it to the ip, replacing the old chain. 2193 * 2194 * WARNING: chain locks can lock buffer cache buffers, to avoid 2195 * deadlocks we want to unlock before issuing a cache_*() 2196 * op (that might have to lock a vnode). 2197 */ 2198 error = hammer2_inode_connect(&trans, hlink, 2199 tdip, &chain, 2200 tname, tname_len); 2201 if (error == 0) { 2202 KKASSERT(chain != NULL); 2203 hammer2_inode_repoint(ip, (hlink ? ip->pip : tdip), chain); 2204 cache_rename(ap->a_fnch, ap->a_tnch); 2205 } 2206 done: 2207 hammer2_inode_unlock_ex(ip, chain); 2208 hammer2_inode_drop(ip); 2209 hammer2_trans_done(&trans); 2210 2211 return (error); 2212 } 2213 2214 /* 2215 * Strategy code 2216 * 2217 * WARNING: The strategy code cannot safely use hammer2 transactions 2218 * as this can deadlock against vfs_sync's vfsync() call 2219 * if multiple flushes are queued. 2220 */ 2221 static int hammer2_strategy_read(struct vop_strategy_args *ap); 2222 static int hammer2_strategy_write(struct vop_strategy_args *ap); 2223 2224 static 2225 int 2226 hammer2_vop_strategy(struct vop_strategy_args *ap) 2227 { 2228 struct bio *biop; 2229 struct buf *bp; 2230 int error; 2231 2232 biop = ap->a_bio; 2233 bp = biop->bio_buf; 2234 2235 switch(bp->b_cmd) { 2236 case BUF_CMD_READ: 2237 error = hammer2_strategy_read(ap); 2238 ++hammer2_iod_file_read; 2239 break; 2240 case BUF_CMD_WRITE: 2241 error = hammer2_strategy_write(ap); 2242 ++hammer2_iod_file_write; 2243 break; 2244 default: 2245 bp->b_error = error = EINVAL; 2246 bp->b_flags |= B_ERROR; 2247 biodone(biop); 2248 break; 2249 } 2250 2251 return (error); 2252 } 2253 2254 static 2255 int 2256 hammer2_strategy_read(struct vop_strategy_args *ap) 2257 { 2258 struct buf *bp; 2259 struct bio *bio; 2260 struct bio *nbio; 2261 hammer2_mount_t *hmp; 2262 hammer2_inode_t *ip; 2263 hammer2_chain_t *parent; 2264 hammer2_chain_t *chain; 2265 hammer2_key_t lbase; 2266 2267 bio = ap->a_bio; 2268 bp = bio->bio_buf; 2269 ip = VTOI(ap->a_vp); 2270 hmp = ip->hmp; 2271 nbio = push_bio(bio); 2272 2273 lbase = bio->bio_offset; 2274 chain = NULL; 2275 KKASSERT(((int)lbase & HAMMER2_PBUFMASK) == 0); 2276 2277 #if 0 2278 kprintf("read lbase %jd cached %016jx\n", 2279 lbase, nbio->bio_offset); 2280 #endif 2281 2282 /* 2283 * We must characterize the logical->physical translation if it 2284 * has not already been cached. 2285 * 2286 * Physical data references < LBUFSIZE are never cached. This 2287 * includes both small-block allocations and inode-embedded data. 2288 */ 2289 if (nbio->bio_offset == NOOFFSET) { 2290 parent = hammer2_inode_lock_sh(ip); 2291 2292 chain = hammer2_chain_lookup(&parent, lbase, lbase, 2293 HAMMER2_LOOKUP_NODATA | 2294 HAMMER2_LOOKUP_SHARED); 2295 if (chain == NULL) { 2296 /* 2297 * Data is zero-fill 2298 */ 2299 nbio->bio_offset = ZFOFFSET; 2300 } else if (chain->bref.type == HAMMER2_BREF_TYPE_INODE) { 2301 /* 2302 * Data is embedded in the inode (do nothing) 2303 */ 2304 KKASSERT(chain == parent); 2305 hammer2_chain_unlock(chain); 2306 nbio->bio_offset = NOOFFSET; 2307 } else if (chain->bref.type == HAMMER2_BREF_TYPE_DATA) { 2308 /* 2309 * Data is on-media 2310 */ 2311 KKASSERT(bp->b_bcount == chain->bytes); 2312 nbio->bio_offset = chain->bref.data_off & 2313 HAMMER2_OFF_MASK; 2314 hammer2_chain_unlock(chain); 2315 KKASSERT(nbio->bio_offset != 0); 2316 } else { 2317 panic("hammer2_strategy_read: unknown bref type"); 2318 } 2319 hammer2_inode_unlock_sh(ip, parent); 2320 } 2321 2322 if (hammer2_debug & 0x0020) { 2323 kprintf("read %016jx %016jx\n", 2324 bio->bio_offset, nbio->bio_offset); 2325 } 2326 2327 if (nbio->bio_offset == ZFOFFSET) { 2328 /* 2329 * Data is zero-fill 2330 */ 2331 bp->b_resid = 0; 2332 bp->b_error = 0; 2333 bzero(bp->b_data, bp->b_bcount); 2334 biodone(nbio); 2335 } else if (nbio->bio_offset != NOOFFSET) { 2336 /* 2337 * Forward direct IO to the device 2338 */ 2339 vn_strategy(hmp->devvp, nbio); 2340 } else { 2341 /* 2342 * Data is embedded in inode. 2343 */ 2344 bcopy(chain->data->ipdata.u.data, bp->b_data, 2345 HAMMER2_EMBEDDED_BYTES); 2346 bzero(bp->b_data + HAMMER2_EMBEDDED_BYTES, 2347 bp->b_bcount - HAMMER2_EMBEDDED_BYTES); 2348 bp->b_resid = 0; 2349 bp->b_error = 0; 2350 biodone(nbio); 2351 } 2352 return (0); 2353 } 2354 2355 static 2356 int 2357 hammer2_strategy_write(struct vop_strategy_args *ap) 2358 { 2359 struct buf *bp; 2360 struct bio *bio; 2361 struct bio *nbio; 2362 hammer2_chain_t *chain; 2363 hammer2_mount_t *hmp; 2364 hammer2_inode_t *ip; 2365 2366 bio = ap->a_bio; 2367 bp = bio->bio_buf; 2368 ip = VTOI(ap->a_vp); 2369 hmp = ip->hmp; 2370 nbio = push_bio(bio); 2371 2372 KKASSERT((bio->bio_offset & HAMMER2_PBUFMASK64) == 0); 2373 KKASSERT(nbio->bio_offset != 0 && nbio->bio_offset != ZFOFFSET); 2374 2375 if (nbio->bio_offset == NOOFFSET) { 2376 /* 2377 * The data is embedded in the inode. Note that strategy 2378 * calls for embedded data are synchronous in order to 2379 * ensure that ip->chain is stable. Chain modification 2380 * status is handled by the caller. 2381 */ 2382 KKASSERT(ip->chain->flags & HAMMER2_CHAIN_MODIFIED); 2383 KKASSERT(bio->bio_offset == 0); 2384 KKASSERT(ip->chain && ip->chain->data); 2385 chain = ip->chain; 2386 bcopy(bp->b_data, chain->data->ipdata.u.data, 2387 HAMMER2_EMBEDDED_BYTES); 2388 bp->b_resid = 0; 2389 bp->b_error = 0; 2390 biodone(nbio); 2391 } else { 2392 /* 2393 * Forward direct IO to the device 2394 */ 2395 vn_strategy(hmp->devvp, nbio); 2396 } 2397 return (0); 2398 } 2399 2400 /* 2401 * hammer2_vop_ioctl { vp, command, data, fflag, cred } 2402 */ 2403 static 2404 int 2405 hammer2_vop_ioctl(struct vop_ioctl_args *ap) 2406 { 2407 hammer2_mount_t *hmp; 2408 hammer2_inode_t *ip; 2409 int error; 2410 2411 ip = VTOI(ap->a_vp); 2412 hmp = ip->hmp; 2413 2414 error = hammer2_ioctl(ip, ap->a_command, (void *)ap->a_data, 2415 ap->a_fflag, ap->a_cred); 2416 return (error); 2417 } 2418 2419 static 2420 int 2421 hammer2_vop_mountctl(struct vop_mountctl_args *ap) 2422 { 2423 struct mount *mp; 2424 hammer2_pfsmount_t *pmp; 2425 int rc; 2426 2427 switch (ap->a_op) { 2428 case (MOUNTCTL_SET_EXPORT): 2429 mp = ap->a_head.a_ops->head.vv_mount; 2430 pmp = MPTOPMP(mp); 2431 2432 if (ap->a_ctllen != sizeof(struct export_args)) 2433 rc = (EINVAL); 2434 else 2435 rc = vfs_export(mp, &pmp->export, 2436 (const struct export_args *)ap->a_ctl); 2437 break; 2438 default: 2439 rc = vop_stdmountctl(ap); 2440 break; 2441 } 2442 return (rc); 2443 } 2444 2445 struct vop_ops hammer2_vnode_vops = { 2446 .vop_default = vop_defaultop, 2447 .vop_fsync = hammer2_vop_fsync, 2448 .vop_getpages = vop_stdgetpages, 2449 .vop_putpages = vop_stdputpages, 2450 .vop_access = hammer2_vop_access, 2451 .vop_advlock = hammer2_vop_advlock, 2452 .vop_close = hammer2_vop_close, 2453 .vop_nlink = hammer2_vop_nlink, 2454 .vop_ncreate = hammer2_vop_ncreate, 2455 .vop_nsymlink = hammer2_vop_nsymlink, 2456 .vop_nremove = hammer2_vop_nremove, 2457 .vop_nrmdir = hammer2_vop_nrmdir, 2458 .vop_nrename = hammer2_vop_nrename, 2459 .vop_getattr = hammer2_vop_getattr, 2460 .vop_setattr = hammer2_vop_setattr, 2461 .vop_readdir = hammer2_vop_readdir, 2462 .vop_readlink = hammer2_vop_readlink, 2463 .vop_getpages = vop_stdgetpages, 2464 .vop_putpages = vop_stdputpages, 2465 .vop_read = hammer2_vop_read, 2466 .vop_write = hammer2_vop_write, 2467 .vop_open = hammer2_vop_open, 2468 .vop_inactive = hammer2_vop_inactive, 2469 .vop_reclaim = hammer2_vop_reclaim, 2470 .vop_nresolve = hammer2_vop_nresolve, 2471 .vop_nlookupdotdot = hammer2_vop_nlookupdotdot, 2472 .vop_nmkdir = hammer2_vop_nmkdir, 2473 .vop_ioctl = hammer2_vop_ioctl, 2474 .vop_mountctl = hammer2_vop_mountctl, 2475 .vop_bmap = hammer2_vop_bmap, 2476 .vop_strategy = hammer2_vop_strategy, 2477 }; 2478 2479 struct vop_ops hammer2_spec_vops = { 2480 2481 }; 2482 2483 struct vop_ops hammer2_fifo_vops = { 2484 2485 }; 2486