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 bp = NULL; 830 error = cluster_readx(ip->vp, leof, lbase, lblksize, 831 B_NOTMETA | B_KVABIO, 832 uio->uio_resid, 833 seqcount * MAXBSIZE, 834 &bp); 835 #else 836 if (uio->uio_segflg == UIO_NOCOPY) { 837 bp = getblk(ip->vp, lbase, lblksize, 838 GETBLK_BHEAVY | GETBLK_KVABIO, 0); 839 if (bp->b_flags & B_CACHE) { 840 int i; 841 int j = 0; 842 if (bp->b_xio.xio_npages != 16) 843 kprintf("NPAGES BAD\n"); 844 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 845 vm_page_t m; 846 m = bp->b_xio.xio_pages[i]; 847 if (m == NULL || m->valid == 0) { 848 kprintf("bp %016jx %016jx pg %d inv", 849 lbase, leof, i); 850 if (m) 851 kprintf("m->object %p/%p", m->object, ip->vp->v_object); 852 kprintf("\n"); 853 j = 1; 854 } 855 } 856 if (j) 857 kprintf("b_flags %08x, b_error %d\n", bp->b_flags, bp->b_error); 858 } 859 bqrelse(bp); 860 } 861 error = bread_kvabio(ip->vp, lbase, lblksize, &bp); 862 #endif 863 if (error) { 864 brelse(bp); 865 break; 866 } 867 bkvasync(bp); 868 loff = (int)(uio->uio_offset - lbase); 869 n = lblksize - loff; 870 if (n > uio->uio_resid) 871 n = uio->uio_resid; 872 if (n > size - uio->uio_offset) 873 n = (int)(size - uio->uio_offset); 874 bp->b_flags |= B_AGE; 875 uiomovebp(bp, (char *)bp->b_data + loff, n, uio); 876 bqrelse(bp); 877 } 878 hammer2_mtx_unlock(&ip->truncate_lock); 879 880 return (error); 881 } 882 883 /* 884 * Write to the file represented by the inode via the logical buffer cache. 885 * The inode may represent a regular file or a symlink. 886 * 887 * The inode must not be locked. 888 */ 889 static 890 int 891 hammer2_write_file(hammer2_inode_t *ip, struct uio *uio, 892 int ioflag, int seqcount) 893 { 894 hammer2_key_t old_eof; 895 hammer2_key_t new_eof; 896 struct buf *bp; 897 int kflags; 898 int error; 899 int modified; 900 901 /* 902 * Setup if append 903 * 904 * WARNING! Assumes that the kernel interlocks size changes at the 905 * vnode level. 906 */ 907 hammer2_mtx_ex(&ip->lock); 908 hammer2_mtx_sh(&ip->truncate_lock); 909 if (ioflag & IO_APPEND) 910 uio->uio_offset = ip->meta.size; 911 old_eof = ip->meta.size; 912 913 /* 914 * Extend the file if necessary. If the write fails at some point 915 * we will truncate it back down to cover as much as we were able 916 * to write. 917 * 918 * Doing this now makes it easier to calculate buffer sizes in 919 * the loop. 920 */ 921 kflags = 0; 922 error = 0; 923 modified = 0; 924 925 if (uio->uio_offset + uio->uio_resid > old_eof) { 926 new_eof = uio->uio_offset + uio->uio_resid; 927 modified = 1; 928 hammer2_extend_file(ip, new_eof); 929 kflags |= NOTE_EXTEND; 930 } else { 931 new_eof = old_eof; 932 } 933 hammer2_mtx_unlock(&ip->lock); 934 935 /* 936 * UIO write loop 937 */ 938 while (uio->uio_resid > 0) { 939 hammer2_key_t lbase; 940 int trivial; 941 int endofblk; 942 int lblksize; 943 int loff; 944 int n; 945 946 /* 947 * Don't allow the buffer build to blow out the buffer 948 * cache. 949 */ 950 if ((ioflag & IO_RECURSE) == 0) 951 bwillwrite(HAMMER2_PBUFSIZE); 952 953 /* 954 * This nominally tells us how much we can cluster and 955 * what the logical buffer size needs to be. Currently 956 * we don't try to cluster the write and just handle one 957 * block at a time. 958 */ 959 lblksize = hammer2_calc_logical(ip, uio->uio_offset, 960 &lbase, NULL); 961 loff = (int)(uio->uio_offset - lbase); 962 963 KKASSERT(lblksize <= 65536); 964 965 /* 966 * Calculate bytes to copy this transfer and whether the 967 * copy completely covers the buffer or not. 968 */ 969 trivial = 0; 970 n = lblksize - loff; 971 if (n > uio->uio_resid) { 972 n = uio->uio_resid; 973 if (loff == lbase && uio->uio_offset + n == new_eof) 974 trivial = 1; 975 endofblk = 0; 976 } else { 977 if (loff == 0) 978 trivial = 1; 979 endofblk = 1; 980 } 981 if (lbase >= new_eof) 982 trivial = 1; 983 984 /* 985 * Get the buffer 986 */ 987 if (uio->uio_segflg == UIO_NOCOPY) { 988 /* 989 * Issuing a write with the same data backing the 990 * buffer. Instantiate the buffer to collect the 991 * backing vm pages, then read-in any missing bits. 992 * 993 * This case is used by vop_stdputpages(). 994 */ 995 bp = getblk(ip->vp, lbase, lblksize, 996 GETBLK_BHEAVY | GETBLK_KVABIO, 0); 997 if ((bp->b_flags & B_CACHE) == 0) { 998 bqrelse(bp); 999 error = bread_kvabio(ip->vp, lbase, 1000 lblksize, &bp); 1001 } 1002 } else if (trivial) { 1003 /* 1004 * Even though we are entirely overwriting the buffer 1005 * we may still have to zero it out to avoid a 1006 * mmap/write visibility issue. 1007 */ 1008 bp = getblk(ip->vp, lbase, lblksize, 1009 GETBLK_BHEAVY | GETBLK_KVABIO, 0); 1010 if ((bp->b_flags & B_CACHE) == 0) 1011 vfs_bio_clrbuf(bp); 1012 } else { 1013 /* 1014 * Partial overwrite, read in any missing bits then 1015 * replace the portion being written. 1016 * 1017 * (The strategy code will detect zero-fill physical 1018 * blocks for this case). 1019 */ 1020 error = bread_kvabio(ip->vp, lbase, lblksize, &bp); 1021 if (error == 0) 1022 bheavy(bp); 1023 } 1024 1025 if (error) { 1026 brelse(bp); 1027 break; 1028 } 1029 1030 /* 1031 * Ok, copy the data in 1032 */ 1033 bkvasync(bp); 1034 error = uiomovebp(bp, bp->b_data + loff, n, uio); 1035 kflags |= NOTE_WRITE; 1036 modified = 1; 1037 if (error) { 1038 brelse(bp); 1039 break; 1040 } 1041 1042 /* 1043 * WARNING: Pageout daemon will issue UIO_NOCOPY writes 1044 * with IO_SYNC or IO_ASYNC set. These writes 1045 * must be handled as the pageout daemon expects. 1046 * 1047 * NOTE! H2 relies on cluster_write() here because it 1048 * cannot preallocate disk blocks at the logical 1049 * level due to not knowing what the compression 1050 * size will be at this time. 1051 * 1052 * We must use cluster_write() here and we depend 1053 * on the write-behind feature to flush buffers 1054 * appropriately. If we let the buffer daemons do 1055 * it the block allocations will be all over the 1056 * map. 1057 */ 1058 if (ioflag & IO_SYNC) { 1059 bwrite(bp); 1060 } else if ((ioflag & IO_DIRECT) && endofblk) { 1061 bawrite(bp); 1062 } else if (ioflag & IO_ASYNC) { 1063 bawrite(bp); 1064 } else if (ip->vp->v_mount->mnt_flag & MNT_NOCLUSTERW) { 1065 bdwrite(bp); 1066 } else { 1067 #if 1 1068 bp->b_flags |= B_CLUSTEROK; 1069 cluster_write(bp, new_eof, lblksize, seqcount); 1070 #else 1071 bp->b_flags |= B_CLUSTEROK; 1072 bdwrite(bp); 1073 #endif 1074 } 1075 } 1076 1077 /* 1078 * Cleanup. If we extended the file EOF but failed to write through 1079 * the entire write is a failure and we have to back-up. 1080 */ 1081 if (error && new_eof != old_eof) { 1082 hammer2_mtx_unlock(&ip->truncate_lock); 1083 hammer2_mtx_ex(&ip->lock); 1084 hammer2_mtx_ex(&ip->truncate_lock); 1085 hammer2_truncate_file(ip, old_eof); 1086 if (ip->flags & HAMMER2_INODE_MODIFIED) 1087 hammer2_inode_chain_sync(ip); 1088 hammer2_mtx_unlock(&ip->lock); 1089 } else if (modified) { 1090 hammer2_mtx_ex(&ip->lock); 1091 hammer2_inode_modify(ip); 1092 if (ip->vp && ip->vp->v_writecount == 0 && 1093 ip->vp->v_type == VREG) { 1094 ip->meta.mtime = 1095 (unsigned long)ip->vp->v_lastwrite_ts.tv_sec * 1096 1000000 + 1097 ip->vp->v_lastwrite_ts.tv_nsec / 1000; 1098 } else { 1099 hammer2_update_time(&ip->meta.mtime); 1100 } 1101 if (ip->flags & HAMMER2_INODE_MODIFIED) 1102 hammer2_inode_chain_sync(ip); 1103 hammer2_mtx_unlock(&ip->lock); 1104 hammer2_knote(ip->vp, kflags); 1105 } 1106 hammer2_trans_assert_strategy(ip->pmp); 1107 hammer2_mtx_unlock(&ip->truncate_lock); 1108 1109 return error; 1110 } 1111 1112 /* 1113 * Truncate the size of a file. The inode must not be locked. 1114 * 1115 * We must unconditionally set HAMMER2_INODE_RESIZED to properly 1116 * ensure that any on-media data beyond the new file EOF has been destroyed. 1117 * 1118 * WARNING: nvtruncbuf() can only be safely called without the inode lock 1119 * held due to the way our write thread works. If the truncation 1120 * occurs in the middle of a buffer, nvtruncbuf() is responsible 1121 * for dirtying that buffer and zeroing out trailing bytes. 1122 * 1123 * WARNING! Assumes that the kernel interlocks size changes at the 1124 * vnode level. 1125 * 1126 * WARNING! Caller assumes responsibility for removing dead blocks 1127 * if INODE_RESIZED is set. 1128 */ 1129 static 1130 void 1131 hammer2_truncate_file(hammer2_inode_t *ip, hammer2_key_t nsize) 1132 { 1133 hammer2_key_t lbase; 1134 int nblksize; 1135 1136 hammer2_mtx_unlock(&ip->lock); 1137 if (ip->vp) { 1138 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL); 1139 nvtruncbuf(ip->vp, nsize, 1140 nblksize, (int)nsize & (nblksize - 1), 1141 0); 1142 } 1143 hammer2_mtx_ex(&ip->lock); 1144 KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0); 1145 ip->osize = ip->meta.size; 1146 ip->meta.size = nsize; 1147 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED); 1148 hammer2_inode_modify(ip); 1149 } 1150 1151 /* 1152 * Extend the size of a file. The inode must not be locked. 1153 * 1154 * Even though the file size is changing, we do not have to set the 1155 * INODE_RESIZED bit unless the file size crosses the EMBEDDED_BYTES 1156 * boundary. When this occurs a hammer2_inode_chain_sync() is required 1157 * to prepare the inode cluster's indirect block table, otherwise 1158 * async execution of the strategy code will implode on us. 1159 * 1160 * WARNING! Assumes that the kernel interlocks size changes at the 1161 * vnode level. 1162 * 1163 * WARNING! Caller assumes responsibility for transitioning out 1164 * of the inode DIRECTDATA mode if INODE_RESIZED is set. 1165 */ 1166 static 1167 void 1168 hammer2_extend_file(hammer2_inode_t *ip, hammer2_key_t nsize) 1169 { 1170 hammer2_key_t lbase; 1171 hammer2_key_t osize; 1172 int oblksize; 1173 int nblksize; 1174 1175 KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0); 1176 hammer2_inode_modify(ip); 1177 osize = ip->meta.size; 1178 ip->osize = osize; 1179 ip->meta.size = nsize; 1180 1181 if (osize <= HAMMER2_EMBEDDED_BYTES && nsize > HAMMER2_EMBEDDED_BYTES) { 1182 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED); 1183 hammer2_inode_chain_sync(ip); 1184 } 1185 1186 hammer2_mtx_unlock(&ip->lock); 1187 if (ip->vp) { 1188 oblksize = hammer2_calc_logical(ip, osize, &lbase, NULL); 1189 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL); 1190 nvextendbuf(ip->vp, 1191 osize, nsize, 1192 oblksize, nblksize, 1193 -1, -1, 0); 1194 } 1195 hammer2_mtx_ex(&ip->lock); 1196 } 1197 1198 static 1199 int 1200 hammer2_vop_nresolve(struct vop_nresolve_args *ap) 1201 { 1202 hammer2_xop_nresolve_t *xop; 1203 hammer2_inode_t *ip; 1204 hammer2_inode_t *dip; 1205 struct namecache *ncp; 1206 struct vnode *vp; 1207 int error; 1208 1209 dip = VTOI(ap->a_dvp); 1210 xop = hammer2_xop_alloc(dip, 0); 1211 1212 ncp = ap->a_nch->ncp; 1213 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen); 1214 1215 /* 1216 * Note: In DragonFly the kernel handles '.' and '..'. 1217 */ 1218 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1219 hammer2_xop_start(&xop->head, hammer2_xop_nresolve); 1220 1221 error = hammer2_xop_collect(&xop->head, 0); 1222 error = hammer2_error_to_errno(error); 1223 if (error) { 1224 ip = NULL; 1225 } else { 1226 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1); 1227 } 1228 hammer2_inode_unlock(dip); 1229 1230 /* 1231 * Acquire the related vnode 1232 * 1233 * NOTE: For error processing, only ENOENT resolves the namecache 1234 * entry to NULL, otherwise we just return the error and 1235 * leave the namecache unresolved. 1236 * 1237 * NOTE: multiple hammer2_inode structures can be aliased to the 1238 * same chain element, for example for hardlinks. This 1239 * use case does not 'reattach' inode associations that 1240 * might already exist, but always allocates a new one. 1241 * 1242 * WARNING: inode structure is locked exclusively via inode_get 1243 * but chain was locked shared. inode_unlock() 1244 * will handle it properly. 1245 */ 1246 if (ip) { 1247 vp = hammer2_igetv(ip, &error); /* error set to UNIX error */ 1248 if (error == 0) { 1249 vn_unlock(vp); 1250 cache_setvp(ap->a_nch, vp); 1251 } else if (error == ENOENT) { 1252 cache_setvp(ap->a_nch, NULL); 1253 } 1254 hammer2_inode_unlock(ip); 1255 1256 /* 1257 * The vp should not be released until after we've disposed 1258 * of our locks, because it might cause vop_inactive() to 1259 * be called. 1260 */ 1261 if (vp) 1262 vrele(vp); 1263 } else { 1264 error = ENOENT; 1265 cache_setvp(ap->a_nch, NULL); 1266 } 1267 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1268 KASSERT(error || ap->a_nch->ncp->nc_vp != NULL, 1269 ("resolve error %d/%p ap %p\n", 1270 error, ap->a_nch->ncp->nc_vp, ap)); 1271 1272 return error; 1273 } 1274 1275 static 1276 int 1277 hammer2_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap) 1278 { 1279 hammer2_inode_t *dip; 1280 hammer2_tid_t inum; 1281 int error; 1282 1283 dip = VTOI(ap->a_dvp); 1284 inum = dip->meta.iparent; 1285 *ap->a_vpp = NULL; 1286 1287 if (inum) { 1288 error = hammer2_vfs_vget(ap->a_dvp->v_mount, NULL, 1289 inum, ap->a_vpp); 1290 } else { 1291 error = ENOENT; 1292 } 1293 return error; 1294 } 1295 1296 static 1297 int 1298 hammer2_vop_nmkdir(struct vop_nmkdir_args *ap) 1299 { 1300 hammer2_inode_t *dip; 1301 hammer2_inode_t *nip; 1302 struct namecache *ncp; 1303 const uint8_t *name; 1304 size_t name_len; 1305 hammer2_tid_t inum; 1306 int error; 1307 1308 dip = VTOI(ap->a_dvp); 1309 if (dip->pmp->ronly) 1310 return (EROFS); 1311 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1312 return (ENOSPC); 1313 1314 ncp = ap->a_nch->ncp; 1315 name = ncp->nc_name; 1316 name_len = ncp->nc_nlen; 1317 1318 hammer2_pfs_memory_wait(dip->pmp); 1319 hammer2_trans_init(dip->pmp, 0); 1320 1321 inum = hammer2_trans_newinum(dip->pmp); 1322 1323 /* 1324 * Create the actual inode as a hidden file in the iroot, then 1325 * create the directory entry. The creation of the actual inode 1326 * sets its nlinks to 1 which is the value we desire. 1327 */ 1328 nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred, 1329 NULL, 0, inum, 1330 inum, 0, 0, 1331 0, &error); 1332 if (error) { 1333 error = hammer2_error_to_errno(error); 1334 } else { 1335 error = hammer2_dirent_create(dip, name, name_len, 1336 nip->meta.inum, nip->meta.type); 1337 /* returns UNIX error code */ 1338 } 1339 if (error) { 1340 if (nip) { 1341 hammer2_inode_unlink_finisher(nip, 0); 1342 hammer2_inode_unlock(nip); 1343 nip = NULL; 1344 } 1345 *ap->a_vpp = NULL; 1346 } else { 1347 *ap->a_vpp = hammer2_igetv(nip, &error); 1348 hammer2_inode_unlock(nip); 1349 } 1350 1351 /* 1352 * Update dip's mtime 1353 * 1354 * We can use a shared inode lock and allow the meta.mtime update 1355 * SMP race. hammer2_inode_modify() is MPSAFE w/a shared lock. 1356 */ 1357 if (error == 0) { 1358 uint64_t mtime; 1359 1360 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1361 hammer2_update_time(&mtime); 1362 hammer2_inode_modify(dip); 1363 dip->meta.mtime = mtime; 1364 hammer2_inode_unlock(dip); 1365 } 1366 1367 hammer2_trans_done(dip->pmp); 1368 1369 if (error == 0) { 1370 cache_setunresolved(ap->a_nch); 1371 cache_setvp(ap->a_nch, *ap->a_vpp); 1372 hammer2_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1373 } 1374 return error; 1375 } 1376 1377 static 1378 int 1379 hammer2_vop_open(struct vop_open_args *ap) 1380 { 1381 return vop_stdopen(ap); 1382 } 1383 1384 /* 1385 * hammer2_vop_advlock { vp, id, op, fl, flags } 1386 */ 1387 static 1388 int 1389 hammer2_vop_advlock(struct vop_advlock_args *ap) 1390 { 1391 hammer2_inode_t *ip = VTOI(ap->a_vp); 1392 hammer2_off_t size; 1393 1394 size = ip->meta.size; 1395 return (lf_advlock(ap, &ip->advlock, size)); 1396 } 1397 1398 static 1399 int 1400 hammer2_vop_close(struct vop_close_args *ap) 1401 { 1402 return vop_stdclose(ap); 1403 } 1404 1405 /* 1406 * hammer2_vop_nlink { nch, dvp, vp, cred } 1407 * 1408 * Create a hardlink from (vp) to {dvp, nch}. 1409 */ 1410 static 1411 int 1412 hammer2_vop_nlink(struct vop_nlink_args *ap) 1413 { 1414 hammer2_inode_t *tdip; /* target directory to create link in */ 1415 hammer2_inode_t *ip; /* inode we are hardlinking to */ 1416 struct namecache *ncp; 1417 const uint8_t *name; 1418 size_t name_len; 1419 int error; 1420 1421 if (ap->a_dvp->v_mount != ap->a_vp->v_mount) 1422 return(EXDEV); 1423 1424 tdip = VTOI(ap->a_dvp); 1425 if (tdip->pmp->ronly) 1426 return (EROFS); 1427 if (hammer2_vfs_enospace(tdip, 0, ap->a_cred) > 1) 1428 return (ENOSPC); 1429 1430 ncp = ap->a_nch->ncp; 1431 name = ncp->nc_name; 1432 name_len = ncp->nc_nlen; 1433 1434 /* 1435 * ip represents the file being hardlinked. The file could be a 1436 * normal file or a hardlink target if it has already been hardlinked. 1437 * (with the new semantics, it will almost always be a hardlink 1438 * target). 1439 * 1440 * Bump nlinks and potentially also create or move the hardlink 1441 * target in the parent directory common to (ip) and (tdip). The 1442 * consolidation code can modify ip->cluster. The returned cluster 1443 * is locked. 1444 */ 1445 ip = VTOI(ap->a_vp); 1446 KASSERT(ip->pmp, ("ip->pmp is NULL %p %p", ip, ip->pmp)); 1447 hammer2_pfs_memory_wait(ip->pmp); 1448 hammer2_trans_init(ip->pmp, 0); 1449 1450 /* 1451 * Target should be an indexed inode or there's no way we will ever 1452 * be able to find it! 1453 */ 1454 KKASSERT((ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE) == 0); 1455 1456 error = 0; 1457 1458 /* 1459 * Can return NULL and error == EXDEV if the common parent 1460 * crosses a directory with the xlink flag set. 1461 */ 1462 hammer2_inode_lock(tdip, 0); 1463 hammer2_inode_lock(ip, 0); 1464 1465 /* 1466 * Create the directory entry and bump nlinks. 1467 */ 1468 if (error == 0) { 1469 error = hammer2_dirent_create(tdip, name, name_len, 1470 ip->meta.inum, ip->meta.type); 1471 hammer2_inode_modify(ip); 1472 ++ip->meta.nlinks; 1473 } 1474 if (error == 0) { 1475 /* 1476 * Update dip's mtime 1477 */ 1478 uint64_t mtime; 1479 1480 hammer2_update_time(&mtime); 1481 hammer2_inode_modify(tdip); 1482 tdip->meta.mtime = mtime; 1483 1484 cache_setunresolved(ap->a_nch); 1485 cache_setvp(ap->a_nch, ap->a_vp); 1486 } 1487 hammer2_inode_unlock(ip); 1488 hammer2_inode_unlock(tdip); 1489 1490 hammer2_trans_done(ip->pmp); 1491 hammer2_knote(ap->a_vp, NOTE_LINK); 1492 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1493 1494 return error; 1495 } 1496 1497 /* 1498 * hammer2_vop_ncreate { nch, dvp, vpp, cred, vap } 1499 * 1500 * The operating system has already ensured that the directory entry 1501 * does not exist and done all appropriate namespace locking. 1502 */ 1503 static 1504 int 1505 hammer2_vop_ncreate(struct vop_ncreate_args *ap) 1506 { 1507 hammer2_inode_t *dip; 1508 hammer2_inode_t *nip; 1509 struct namecache *ncp; 1510 const uint8_t *name; 1511 size_t name_len; 1512 hammer2_tid_t inum; 1513 int error; 1514 1515 dip = VTOI(ap->a_dvp); 1516 if (dip->pmp->ronly) 1517 return (EROFS); 1518 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1519 return (ENOSPC); 1520 1521 ncp = ap->a_nch->ncp; 1522 name = ncp->nc_name; 1523 name_len = ncp->nc_nlen; 1524 hammer2_pfs_memory_wait(dip->pmp); 1525 hammer2_trans_init(dip->pmp, 0); 1526 1527 inum = hammer2_trans_newinum(dip->pmp); 1528 1529 /* 1530 * Create the actual inode as a hidden file in the iroot, then 1531 * create the directory entry. The creation of the actual inode 1532 * sets its nlinks to 1 which is the value we desire. 1533 */ 1534 nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred, 1535 NULL, 0, inum, 1536 inum, 0, 0, 1537 0, &error); 1538 1539 if (error) { 1540 error = hammer2_error_to_errno(error); 1541 } else { 1542 error = hammer2_dirent_create(dip, name, name_len, 1543 nip->meta.inum, nip->meta.type); 1544 } 1545 if (error) { 1546 if (nip) { 1547 hammer2_inode_unlink_finisher(nip, 0); 1548 hammer2_inode_unlock(nip); 1549 nip = NULL; 1550 } 1551 *ap->a_vpp = NULL; 1552 } else { 1553 *ap->a_vpp = hammer2_igetv(nip, &error); 1554 hammer2_inode_unlock(nip); 1555 } 1556 1557 /* 1558 * Update dip's mtime 1559 */ 1560 if (error == 0) { 1561 uint64_t mtime; 1562 1563 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1564 hammer2_update_time(&mtime); 1565 hammer2_inode_modify(dip); 1566 dip->meta.mtime = mtime; 1567 hammer2_inode_unlock(dip); 1568 } 1569 1570 hammer2_trans_done(dip->pmp); 1571 1572 if (error == 0) { 1573 cache_setunresolved(ap->a_nch); 1574 cache_setvp(ap->a_nch, *ap->a_vpp); 1575 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1576 } 1577 return error; 1578 } 1579 1580 /* 1581 * Make a device node (typically a fifo) 1582 */ 1583 static 1584 int 1585 hammer2_vop_nmknod(struct vop_nmknod_args *ap) 1586 { 1587 hammer2_inode_t *dip; 1588 hammer2_inode_t *nip; 1589 struct namecache *ncp; 1590 const uint8_t *name; 1591 size_t name_len; 1592 hammer2_tid_t inum; 1593 int error; 1594 1595 dip = VTOI(ap->a_dvp); 1596 if (dip->pmp->ronly) 1597 return (EROFS); 1598 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1599 return (ENOSPC); 1600 1601 ncp = ap->a_nch->ncp; 1602 name = ncp->nc_name; 1603 name_len = ncp->nc_nlen; 1604 hammer2_pfs_memory_wait(dip->pmp); 1605 hammer2_trans_init(dip->pmp, 0); 1606 1607 /* 1608 * Create the device inode and then create the directory entry. 1609 */ 1610 inum = hammer2_trans_newinum(dip->pmp); 1611 nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred, 1612 NULL, 0, inum, 1613 inum, 0, 0, 1614 0, &error); 1615 if (error == 0) { 1616 error = hammer2_dirent_create(dip, name, name_len, 1617 nip->meta.inum, nip->meta.type); 1618 } 1619 if (error) { 1620 if (nip) { 1621 hammer2_inode_unlink_finisher(nip, 0); 1622 hammer2_inode_unlock(nip); 1623 nip = NULL; 1624 } 1625 *ap->a_vpp = NULL; 1626 } else { 1627 *ap->a_vpp = hammer2_igetv(nip, &error); 1628 hammer2_inode_unlock(nip); 1629 } 1630 1631 /* 1632 * Update dip's mtime 1633 */ 1634 if (error == 0) { 1635 uint64_t mtime; 1636 1637 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1638 hammer2_update_time(&mtime); 1639 hammer2_inode_modify(dip); 1640 dip->meta.mtime = mtime; 1641 hammer2_inode_unlock(dip); 1642 } 1643 1644 hammer2_trans_done(dip->pmp); 1645 1646 if (error == 0) { 1647 cache_setunresolved(ap->a_nch); 1648 cache_setvp(ap->a_nch, *ap->a_vpp); 1649 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1650 } 1651 return error; 1652 } 1653 1654 /* 1655 * hammer2_vop_nsymlink { nch, dvp, vpp, cred, vap, target } 1656 */ 1657 static 1658 int 1659 hammer2_vop_nsymlink(struct vop_nsymlink_args *ap) 1660 { 1661 hammer2_inode_t *dip; 1662 hammer2_inode_t *nip; 1663 struct namecache *ncp; 1664 const uint8_t *name; 1665 size_t name_len; 1666 hammer2_tid_t inum; 1667 int error; 1668 1669 dip = VTOI(ap->a_dvp); 1670 if (dip->pmp->ronly) 1671 return (EROFS); 1672 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1673 return (ENOSPC); 1674 1675 ncp = ap->a_nch->ncp; 1676 name = ncp->nc_name; 1677 name_len = ncp->nc_nlen; 1678 hammer2_pfs_memory_wait(dip->pmp); 1679 hammer2_trans_init(dip->pmp, 0); 1680 1681 ap->a_vap->va_type = VLNK; /* enforce type */ 1682 1683 /* 1684 * Create the softlink as an inode and then create the directory 1685 * entry. 1686 */ 1687 inum = hammer2_trans_newinum(dip->pmp); 1688 1689 nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred, 1690 NULL, 0, inum, 1691 inum, 0, 0, 1692 0, &error); 1693 if (error == 0) { 1694 error = hammer2_dirent_create(dip, name, name_len, 1695 nip->meta.inum, nip->meta.type); 1696 } 1697 if (error) { 1698 if (nip) { 1699 hammer2_inode_unlink_finisher(nip, 0); 1700 hammer2_inode_unlock(nip); 1701 nip = NULL; 1702 } 1703 *ap->a_vpp = NULL; 1704 hammer2_trans_done(dip->pmp); 1705 return error; 1706 } 1707 *ap->a_vpp = hammer2_igetv(nip, &error); 1708 1709 /* 1710 * Build the softlink (~like file data) and finalize the namecache. 1711 */ 1712 if (error == 0) { 1713 size_t bytes; 1714 struct uio auio; 1715 struct iovec aiov; 1716 1717 bytes = strlen(ap->a_target); 1718 1719 hammer2_inode_unlock(nip); 1720 bzero(&auio, sizeof(auio)); 1721 bzero(&aiov, sizeof(aiov)); 1722 auio.uio_iov = &aiov; 1723 auio.uio_segflg = UIO_SYSSPACE; 1724 auio.uio_rw = UIO_WRITE; 1725 auio.uio_resid = bytes; 1726 auio.uio_iovcnt = 1; 1727 auio.uio_td = curthread; 1728 aiov.iov_base = ap->a_target; 1729 aiov.iov_len = bytes; 1730 error = hammer2_write_file(nip, &auio, IO_APPEND, 0); 1731 /* XXX handle error */ 1732 error = 0; 1733 } else { 1734 hammer2_inode_unlock(nip); 1735 } 1736 1737 /* 1738 * Update dip's mtime 1739 */ 1740 if (error == 0) { 1741 uint64_t mtime; 1742 1743 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1744 hammer2_update_time(&mtime); 1745 hammer2_inode_modify(dip); 1746 dip->meta.mtime = mtime; 1747 hammer2_inode_unlock(dip); 1748 } 1749 1750 hammer2_trans_done(dip->pmp); 1751 1752 /* 1753 * Finalize namecache 1754 */ 1755 if (error == 0) { 1756 cache_setunresolved(ap->a_nch); 1757 cache_setvp(ap->a_nch, *ap->a_vpp); 1758 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1759 } 1760 return error; 1761 } 1762 1763 /* 1764 * hammer2_vop_nremove { nch, dvp, cred } 1765 */ 1766 static 1767 int 1768 hammer2_vop_nremove(struct vop_nremove_args *ap) 1769 { 1770 hammer2_xop_unlink_t *xop; 1771 hammer2_inode_t *dip; 1772 hammer2_inode_t *ip; 1773 struct namecache *ncp; 1774 int error; 1775 int isopen; 1776 1777 dip = VTOI(ap->a_dvp); 1778 if (dip->pmp->ronly) 1779 return (EROFS); 1780 #if 0 1781 /* allow removals, except user to also bulkfree */ 1782 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1783 return (ENOSPC); 1784 #endif 1785 1786 ncp = ap->a_nch->ncp; 1787 1788 hammer2_pfs_memory_wait(dip->pmp); 1789 hammer2_trans_init(dip->pmp, 0); 1790 hammer2_inode_lock(dip, 0); 1791 1792 /* 1793 * The unlink XOP unlinks the path from the directory and 1794 * locates and returns the cluster associated with the real inode. 1795 * We have to handle nlinks here on the frontend. 1796 */ 1797 xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING); 1798 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen); 1799 1800 /* 1801 * The namecache entry is locked so nobody can use this namespace. 1802 * Calculate isopen to determine if this namespace has an open vp 1803 * associated with it and resolve the vp only if it does. 1804 * 1805 * We try to avoid resolving the vnode if nobody has it open, but 1806 * note that the test is via this namespace only. 1807 */ 1808 isopen = cache_isopen(ap->a_nch); 1809 xop->isdir = 0; 1810 xop->dopermanent = 0; 1811 hammer2_xop_start(&xop->head, hammer2_xop_unlink); 1812 1813 /* 1814 * Collect the real inode and adjust nlinks, destroy the real 1815 * inode if nlinks transitions to 0 and it was the real inode 1816 * (else it has already been removed). 1817 */ 1818 error = hammer2_xop_collect(&xop->head, 0); 1819 error = hammer2_error_to_errno(error); 1820 hammer2_inode_unlock(dip); 1821 1822 if (error == 0) { 1823 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1); 1824 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1825 if (ip) { 1826 hammer2_inode_unlink_finisher(ip, isopen); 1827 hammer2_inode_unlock(ip); 1828 } 1829 } else { 1830 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1831 } 1832 1833 /* 1834 * Update dip's mtime 1835 */ 1836 if (error == 0) { 1837 uint64_t mtime; 1838 1839 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1840 hammer2_update_time(&mtime); 1841 hammer2_inode_modify(dip); 1842 dip->meta.mtime = mtime; 1843 hammer2_inode_unlock(dip); 1844 } 1845 1846 hammer2_inode_run_sideq(dip->pmp, 0); 1847 hammer2_trans_done(dip->pmp); 1848 if (error == 0) { 1849 cache_unlink(ap->a_nch); 1850 hammer2_knote(ap->a_dvp, NOTE_WRITE); 1851 } 1852 return (error); 1853 } 1854 1855 /* 1856 * hammer2_vop_nrmdir { nch, dvp, cred } 1857 */ 1858 static 1859 int 1860 hammer2_vop_nrmdir(struct vop_nrmdir_args *ap) 1861 { 1862 hammer2_xop_unlink_t *xop; 1863 hammer2_inode_t *dip; 1864 hammer2_inode_t *ip; 1865 struct namecache *ncp; 1866 int isopen; 1867 int error; 1868 1869 dip = VTOI(ap->a_dvp); 1870 if (dip->pmp->ronly) 1871 return (EROFS); 1872 #if 0 1873 /* allow removals, except user to also bulkfree */ 1874 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1) 1875 return (ENOSPC); 1876 #endif 1877 1878 hammer2_pfs_memory_wait(dip->pmp); 1879 hammer2_trans_init(dip->pmp, 0); 1880 hammer2_inode_lock(dip, 0); 1881 1882 xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING); 1883 1884 ncp = ap->a_nch->ncp; 1885 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen); 1886 isopen = cache_isopen(ap->a_nch); 1887 xop->isdir = 1; 1888 xop->dopermanent = 0; 1889 hammer2_xop_start(&xop->head, hammer2_xop_unlink); 1890 1891 /* 1892 * Collect the real inode and adjust nlinks, destroy the real 1893 * inode if nlinks transitions to 0 and it was the real inode 1894 * (else it has already been removed). 1895 */ 1896 error = hammer2_xop_collect(&xop->head, 0); 1897 error = hammer2_error_to_errno(error); 1898 hammer2_inode_unlock(dip); 1899 1900 if (error == 0) { 1901 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1); 1902 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1903 if (ip) { 1904 hammer2_inode_unlink_finisher(ip, isopen); 1905 hammer2_inode_unlock(ip); 1906 } 1907 } else { 1908 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1909 } 1910 1911 /* 1912 * Update dip's mtime 1913 */ 1914 if (error == 0) { 1915 uint64_t mtime; 1916 1917 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED); 1918 hammer2_update_time(&mtime); 1919 hammer2_inode_modify(dip); 1920 dip->meta.mtime = mtime; 1921 hammer2_inode_unlock(dip); 1922 } 1923 1924 hammer2_inode_run_sideq(dip->pmp, 0); 1925 hammer2_trans_done(dip->pmp); 1926 if (error == 0) { 1927 cache_unlink(ap->a_nch); 1928 hammer2_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1929 } 1930 return (error); 1931 } 1932 1933 /* 1934 * hammer2_vop_nrename { fnch, tnch, fdvp, tdvp, cred } 1935 */ 1936 static 1937 int 1938 hammer2_vop_nrename(struct vop_nrename_args *ap) 1939 { 1940 struct namecache *fncp; 1941 struct namecache *tncp; 1942 hammer2_inode_t *fdip; /* source directory */ 1943 hammer2_inode_t *tdip; /* target directory */ 1944 hammer2_inode_t *ip; /* file being renamed */ 1945 hammer2_inode_t *tip; /* replaced target during rename or NULL */ 1946 const uint8_t *fname; 1947 size_t fname_len; 1948 const uint8_t *tname; 1949 size_t tname_len; 1950 int error; 1951 int update_tdip; 1952 int update_fdip; 1953 hammer2_key_t tlhc; 1954 1955 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount) 1956 return(EXDEV); 1957 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount) 1958 return(EXDEV); 1959 1960 fdip = VTOI(ap->a_fdvp); /* source directory */ 1961 tdip = VTOI(ap->a_tdvp); /* target directory */ 1962 1963 if (fdip->pmp->ronly) 1964 return (EROFS); 1965 if (hammer2_vfs_enospace(fdip, 0, ap->a_cred) > 1) 1966 return (ENOSPC); 1967 1968 fncp = ap->a_fnch->ncp; /* entry name in source */ 1969 fname = fncp->nc_name; 1970 fname_len = fncp->nc_nlen; 1971 1972 tncp = ap->a_tnch->ncp; /* entry name in target */ 1973 tname = tncp->nc_name; 1974 tname_len = tncp->nc_nlen; 1975 1976 hammer2_pfs_memory_wait(tdip->pmp); 1977 hammer2_trans_init(tdip->pmp, 0); 1978 1979 update_tdip = 0; 1980 update_fdip = 0; 1981 1982 ip = VTOI(fncp->nc_vp); 1983 hammer2_inode_ref(ip); /* extra ref */ 1984 1985 /* 1986 * Lookup the target name to determine if a directory entry 1987 * is being overwritten. We only hold related inode locks 1988 * temporarily, the operating system is expected to protect 1989 * against rename races. 1990 */ 1991 tip = tncp->nc_vp ? VTOI(tncp->nc_vp) : NULL; 1992 if (tip) 1993 hammer2_inode_ref(tip); /* extra ref */ 1994 1995 /* 1996 * Can return NULL and error == EXDEV if the common parent 1997 * crosses a directory with the xlink flag set. 1998 * 1999 * For now try to avoid deadlocks with a simple pointer address 2000 * test. (tip) can be NULL. 2001 */ 2002 error = 0; 2003 if (fdip <= tdip) { 2004 hammer2_inode_lock(fdip, 0); 2005 hammer2_inode_lock(tdip, 0); 2006 } else { 2007 hammer2_inode_lock(tdip, 0); 2008 hammer2_inode_lock(fdip, 0); 2009 } 2010 if (tip) { 2011 if (ip <= tip) { 2012 hammer2_inode_lock(ip, 0); 2013 hammer2_inode_lock(tip, 0); 2014 } else { 2015 hammer2_inode_lock(tip, 0); 2016 hammer2_inode_lock(ip, 0); 2017 } 2018 } else { 2019 hammer2_inode_lock(ip, 0); 2020 } 2021 2022 #if 0 2023 /* 2024 * Delete the target namespace. 2025 * 2026 * REMOVED - NOW FOLDED INTO XOP_NRENAME OPERATION 2027 */ 2028 { 2029 hammer2_xop_unlink_t *xop2; 2030 hammer2_inode_t *tip; 2031 int isopen; 2032 2033 /* 2034 * The unlink XOP unlinks the path from the directory and 2035 * locates and returns the cluster associated with the real 2036 * inode. We have to handle nlinks here on the frontend. 2037 */ 2038 xop2 = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING); 2039 hammer2_xop_setname(&xop2->head, tname, tname_len); 2040 isopen = cache_isopen(ap->a_tnch); 2041 xop2->isdir = -1; 2042 xop2->dopermanent = 0; 2043 hammer2_xop_start(&xop2->head, hammer2_xop_unlink); 2044 2045 /* 2046 * Collect the real inode and adjust nlinks, destroy the real 2047 * inode if nlinks transitions to 0 and it was the real inode 2048 * (else it has already been removed). 2049 */ 2050 tnch_error = hammer2_xop_collect(&xop2->head, 0); 2051 tnch_error = hammer2_error_to_errno(tnch_error); 2052 /* hammer2_inode_unlock(tdip); */ 2053 2054 if (tnch_error == 0) { 2055 tip = hammer2_inode_get(tdip->pmp, NULL, 2056 &xop2->head.cluster, -1); 2057 hammer2_xop_retire(&xop2->head, HAMMER2_XOPMASK_VOP); 2058 if (tip) { 2059 hammer2_inode_unlink_finisher(tip, isopen); 2060 hammer2_inode_unlock(tip); 2061 } 2062 } else { 2063 hammer2_xop_retire(&xop2->head, HAMMER2_XOPMASK_VOP); 2064 } 2065 /* hammer2_inode_lock(tdip, 0); */ 2066 2067 if (tnch_error && tnch_error != ENOENT) { 2068 error = tnch_error; 2069 goto done2; 2070 } 2071 update_tdip = 1; 2072 } 2073 #endif 2074 2075 /* 2076 * Resolve the collision space for (tdip, tname, tname_len) 2077 * 2078 * tdip must be held exclusively locked to prevent races since 2079 * multiple filenames can end up in the same collision space. 2080 */ 2081 { 2082 hammer2_xop_scanlhc_t *sxop; 2083 hammer2_tid_t lhcbase; 2084 2085 tlhc = hammer2_dirhash(tname, tname_len); 2086 lhcbase = tlhc; 2087 sxop = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING); 2088 sxop->lhc = tlhc; 2089 hammer2_xop_start(&sxop->head, hammer2_xop_scanlhc); 2090 while ((error = hammer2_xop_collect(&sxop->head, 0)) == 0) { 2091 if (tlhc != sxop->head.cluster.focus->bref.key) 2092 break; 2093 ++tlhc; 2094 } 2095 error = hammer2_error_to_errno(error); 2096 hammer2_xop_retire(&sxop->head, HAMMER2_XOPMASK_VOP); 2097 2098 if (error) { 2099 if (error != ENOENT) 2100 goto done2; 2101 ++tlhc; 2102 error = 0; 2103 } 2104 if ((lhcbase ^ tlhc) & ~HAMMER2_DIRHASH_LOMASK) { 2105 error = ENOSPC; 2106 goto done2; 2107 } 2108 } 2109 2110 /* 2111 * Ready to go, issue the rename to the backend. Note that meta-data 2112 * updates to the related inodes occur separately from the rename 2113 * operation. 2114 * 2115 * NOTE: While it is not necessary to update ip->meta.name*, doing 2116 * so aids catastrophic recovery and debugging. 2117 */ 2118 if (error == 0) { 2119 hammer2_xop_nrename_t *xop4; 2120 2121 xop4 = hammer2_xop_alloc(fdip, HAMMER2_XOP_MODIFYING); 2122 xop4->lhc = tlhc; 2123 xop4->ip_key = ip->meta.name_key; 2124 hammer2_xop_setip2(&xop4->head, ip); 2125 hammer2_xop_setip3(&xop4->head, tdip); 2126 hammer2_xop_setname(&xop4->head, fname, fname_len); 2127 hammer2_xop_setname2(&xop4->head, tname, tname_len); 2128 hammer2_xop_start(&xop4->head, hammer2_xop_nrename); 2129 2130 error = hammer2_xop_collect(&xop4->head, 0); 2131 error = hammer2_error_to_errno(error); 2132 hammer2_xop_retire(&xop4->head, HAMMER2_XOPMASK_VOP); 2133 2134 if (error == ENOENT) 2135 error = 0; 2136 2137 /* 2138 * Update inode meta-data. 2139 * 2140 * WARNING! The in-memory inode (ip) structure does not 2141 * maintain a copy of the inode's filename buffer. 2142 */ 2143 if (error == 0 && 2144 (ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE)) { 2145 hammer2_inode_modify(ip); 2146 ip->meta.name_len = tname_len; 2147 ip->meta.name_key = tlhc; 2148 } 2149 if (error == 0) { 2150 hammer2_inode_modify(ip); 2151 ip->meta.iparent = tdip->meta.inum; 2152 } 2153 update_fdip = 1; 2154 update_tdip = 1; 2155 } 2156 2157 done2: 2158 /* 2159 * If no error, the backend has replaced the target directory entry. 2160 * We must adjust nlinks on the original replace target if it exists. 2161 */ 2162 if (error == 0 && tip) { 2163 int isopen; 2164 2165 isopen = cache_isopen(ap->a_tnch); 2166 hammer2_inode_unlink_finisher(tip, isopen); 2167 } 2168 2169 /* 2170 * Update directory mtimes to represent the something changed. 2171 */ 2172 if (update_fdip || update_tdip) { 2173 uint64_t mtime; 2174 2175 hammer2_update_time(&mtime); 2176 if (update_fdip) { 2177 hammer2_inode_modify(fdip); 2178 fdip->meta.mtime = mtime; 2179 } 2180 if (update_tdip) { 2181 hammer2_inode_modify(tdip); 2182 tdip->meta.mtime = mtime; 2183 } 2184 } 2185 if (tip) { 2186 hammer2_inode_unlock(tip); 2187 hammer2_inode_drop(tip); 2188 } 2189 hammer2_inode_unlock(ip); 2190 hammer2_inode_unlock(tdip); 2191 hammer2_inode_unlock(fdip); 2192 hammer2_inode_drop(ip); 2193 hammer2_inode_run_sideq(fdip->pmp, 0); 2194 2195 hammer2_trans_done(tdip->pmp); 2196 2197 /* 2198 * Issue the namecache update after unlocking all the internal 2199 * hammer2 structures, otherwise we might deadlock. 2200 * 2201 * WARNING! The target namespace must be updated atomically, 2202 * and we depend on cache_rename() to handle that for 2203 * us. Do not do a separate cache_unlink() because 2204 * that leaves a small window of opportunity for other 2205 * threads to allocate the target namespace before we 2206 * manage to complete our rename. 2207 * 2208 * WARNING! cache_rename() (and cache_unlink()) will properly 2209 * set VREF_FINALIZE on any attached vnode. Do not 2210 * call cache_setunresolved() manually before-hand as 2211 * this will prevent the flag from being set later via 2212 * cache_rename(). If VREF_FINALIZE is not properly set 2213 * and the inode is no longer in the topology, related 2214 * chains can remain dirty indefinitely. 2215 */ 2216 if (error == 0 && tip) { 2217 /*cache_unlink(ap->a_tnch); see above */ 2218 /*cache_setunresolved(ap->a_tnch); see above */ 2219 } 2220 if (error == 0) { 2221 cache_rename(ap->a_fnch, ap->a_tnch); 2222 hammer2_knote(ap->a_fdvp, NOTE_WRITE); 2223 hammer2_knote(ap->a_tdvp, NOTE_WRITE); 2224 hammer2_knote(fncp->nc_vp, NOTE_RENAME); 2225 } 2226 2227 return (error); 2228 } 2229 2230 /* 2231 * hammer2_vop_ioctl { vp, command, data, fflag, cred } 2232 */ 2233 static 2234 int 2235 hammer2_vop_ioctl(struct vop_ioctl_args *ap) 2236 { 2237 hammer2_inode_t *ip; 2238 int error; 2239 2240 ip = VTOI(ap->a_vp); 2241 2242 error = hammer2_ioctl(ip, ap->a_command, (void *)ap->a_data, 2243 ap->a_fflag, ap->a_cred); 2244 return (error); 2245 } 2246 2247 static 2248 int 2249 hammer2_vop_mountctl(struct vop_mountctl_args *ap) 2250 { 2251 struct mount *mp; 2252 hammer2_pfs_t *pmp; 2253 int rc; 2254 2255 switch (ap->a_op) { 2256 case (MOUNTCTL_SET_EXPORT): 2257 mp = ap->a_head.a_ops->head.vv_mount; 2258 pmp = MPTOPMP(mp); 2259 2260 if (ap->a_ctllen != sizeof(struct export_args)) 2261 rc = (EINVAL); 2262 else 2263 rc = vfs_export(mp, &pmp->export, 2264 (const struct export_args *)ap->a_ctl); 2265 break; 2266 default: 2267 rc = vop_stdmountctl(ap); 2268 break; 2269 } 2270 return (rc); 2271 } 2272 2273 /* 2274 * KQFILTER 2275 */ 2276 static void filt_hammer2detach(struct knote *kn); 2277 static int filt_hammer2read(struct knote *kn, long hint); 2278 static int filt_hammer2write(struct knote *kn, long hint); 2279 static int filt_hammer2vnode(struct knote *kn, long hint); 2280 2281 static struct filterops hammer2read_filtops = 2282 { FILTEROP_ISFD | FILTEROP_MPSAFE, 2283 NULL, filt_hammer2detach, filt_hammer2read }; 2284 static struct filterops hammer2write_filtops = 2285 { FILTEROP_ISFD | FILTEROP_MPSAFE, 2286 NULL, filt_hammer2detach, filt_hammer2write }; 2287 static struct filterops hammer2vnode_filtops = 2288 { FILTEROP_ISFD | FILTEROP_MPSAFE, 2289 NULL, filt_hammer2detach, filt_hammer2vnode }; 2290 2291 static 2292 int 2293 hammer2_vop_kqfilter(struct vop_kqfilter_args *ap) 2294 { 2295 struct vnode *vp = ap->a_vp; 2296 struct knote *kn = ap->a_kn; 2297 2298 switch (kn->kn_filter) { 2299 case EVFILT_READ: 2300 kn->kn_fop = &hammer2read_filtops; 2301 break; 2302 case EVFILT_WRITE: 2303 kn->kn_fop = &hammer2write_filtops; 2304 break; 2305 case EVFILT_VNODE: 2306 kn->kn_fop = &hammer2vnode_filtops; 2307 break; 2308 default: 2309 return (EOPNOTSUPP); 2310 } 2311 2312 kn->kn_hook = (caddr_t)vp; 2313 2314 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 2315 2316 return(0); 2317 } 2318 2319 static void 2320 filt_hammer2detach(struct knote *kn) 2321 { 2322 struct vnode *vp = (void *)kn->kn_hook; 2323 2324 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 2325 } 2326 2327 static int 2328 filt_hammer2read(struct knote *kn, long hint) 2329 { 2330 struct vnode *vp = (void *)kn->kn_hook; 2331 hammer2_inode_t *ip = VTOI(vp); 2332 off_t off; 2333 2334 if (hint == NOTE_REVOKE) { 2335 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 2336 return(1); 2337 } 2338 off = ip->meta.size - kn->kn_fp->f_offset; 2339 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 2340 if (kn->kn_sfflags & NOTE_OLDAPI) 2341 return(1); 2342 return (kn->kn_data != 0); 2343 } 2344 2345 2346 static int 2347 filt_hammer2write(struct knote *kn, long hint) 2348 { 2349 if (hint == NOTE_REVOKE) 2350 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 2351 kn->kn_data = 0; 2352 return (1); 2353 } 2354 2355 static int 2356 filt_hammer2vnode(struct knote *kn, long hint) 2357 { 2358 if (kn->kn_sfflags & hint) 2359 kn->kn_fflags |= hint; 2360 if (hint == NOTE_REVOKE) { 2361 kn->kn_flags |= (EV_EOF | EV_NODATA); 2362 return (1); 2363 } 2364 return (kn->kn_fflags != 0); 2365 } 2366 2367 /* 2368 * FIFO VOPS 2369 */ 2370 static 2371 int 2372 hammer2_vop_markatime(struct vop_markatime_args *ap) 2373 { 2374 hammer2_inode_t *ip; 2375 struct vnode *vp; 2376 2377 vp = ap->a_vp; 2378 ip = VTOI(vp); 2379 2380 if (ip->pmp->ronly) 2381 return (EROFS); 2382 return(0); 2383 } 2384 2385 static 2386 int 2387 hammer2_vop_fifokqfilter(struct vop_kqfilter_args *ap) 2388 { 2389 int error; 2390 2391 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 2392 if (error) 2393 error = hammer2_vop_kqfilter(ap); 2394 return(error); 2395 } 2396 2397 /* 2398 * VOPS vector 2399 */ 2400 struct vop_ops hammer2_vnode_vops = { 2401 .vop_default = vop_defaultop, 2402 .vop_fsync = hammer2_vop_fsync, 2403 .vop_getpages = vop_stdgetpages, 2404 .vop_putpages = vop_stdputpages, 2405 .vop_access = hammer2_vop_access, 2406 .vop_advlock = hammer2_vop_advlock, 2407 .vop_close = hammer2_vop_close, 2408 .vop_nlink = hammer2_vop_nlink, 2409 .vop_ncreate = hammer2_vop_ncreate, 2410 .vop_nsymlink = hammer2_vop_nsymlink, 2411 .vop_nremove = hammer2_vop_nremove, 2412 .vop_nrmdir = hammer2_vop_nrmdir, 2413 .vop_nrename = hammer2_vop_nrename, 2414 .vop_getattr = hammer2_vop_getattr, 2415 .vop_setattr = hammer2_vop_setattr, 2416 .vop_readdir = hammer2_vop_readdir, 2417 .vop_readlink = hammer2_vop_readlink, 2418 .vop_getpages = vop_stdgetpages, 2419 .vop_putpages = vop_stdputpages, 2420 .vop_read = hammer2_vop_read, 2421 .vop_write = hammer2_vop_write, 2422 .vop_open = hammer2_vop_open, 2423 .vop_inactive = hammer2_vop_inactive, 2424 .vop_reclaim = hammer2_vop_reclaim, 2425 .vop_nresolve = hammer2_vop_nresolve, 2426 .vop_nlookupdotdot = hammer2_vop_nlookupdotdot, 2427 .vop_nmkdir = hammer2_vop_nmkdir, 2428 .vop_nmknod = hammer2_vop_nmknod, 2429 .vop_ioctl = hammer2_vop_ioctl, 2430 .vop_mountctl = hammer2_vop_mountctl, 2431 .vop_bmap = hammer2_vop_bmap, 2432 .vop_strategy = hammer2_vop_strategy, 2433 .vop_kqfilter = hammer2_vop_kqfilter 2434 }; 2435 2436 struct vop_ops hammer2_spec_vops = { 2437 .vop_default = vop_defaultop, 2438 .vop_fsync = hammer2_vop_fsync, 2439 .vop_read = vop_stdnoread, 2440 .vop_write = vop_stdnowrite, 2441 .vop_access = hammer2_vop_access, 2442 .vop_close = hammer2_vop_close, 2443 .vop_markatime = hammer2_vop_markatime, 2444 .vop_getattr = hammer2_vop_getattr, 2445 .vop_inactive = hammer2_vop_inactive, 2446 .vop_reclaim = hammer2_vop_reclaim, 2447 .vop_setattr = hammer2_vop_setattr 2448 }; 2449 2450 struct vop_ops hammer2_fifo_vops = { 2451 .vop_default = fifo_vnoperate, 2452 .vop_fsync = hammer2_vop_fsync, 2453 #if 0 2454 .vop_read = hammer2_vop_fiforead, 2455 .vop_write = hammer2_vop_fifowrite, 2456 #endif 2457 .vop_access = hammer2_vop_access, 2458 #if 0 2459 .vop_close = hammer2_vop_fifoclose, 2460 #endif 2461 .vop_markatime = hammer2_vop_markatime, 2462 .vop_getattr = hammer2_vop_getattr, 2463 .vop_inactive = hammer2_vop_inactive, 2464 .vop_reclaim = hammer2_vop_reclaim, 2465 .vop_setattr = hammer2_vop_setattr, 2466 .vop_kqfilter = hammer2_vop_fifokqfilter 2467 }; 2468 2469