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