1 /* 2 * Copyright (c) 2007-2008 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/mountctl.h> 36 #include <sys/namecache.h> 37 #include <sys/buf2.h> 38 #include <vfs/fifofs/fifo.h> 39 40 #include "hammer.h" 41 42 /* 43 * USERFS VNOPS 44 */ 45 static int hammer_vop_fsync(struct vop_fsync_args *); 46 static int hammer_vop_read(struct vop_read_args *); 47 static int hammer_vop_write(struct vop_write_args *); 48 static int hammer_vop_access(struct vop_access_args *); 49 static int hammer_vop_advlock(struct vop_advlock_args *); 50 static int hammer_vop_close(struct vop_close_args *); 51 static int hammer_vop_ncreate(struct vop_ncreate_args *); 52 static int hammer_vop_getattr(struct vop_getattr_args *); 53 static int hammer_vop_nresolve(struct vop_nresolve_args *); 54 static int hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *); 55 static int hammer_vop_nlink(struct vop_nlink_args *); 56 static int hammer_vop_nmkdir(struct vop_nmkdir_args *); 57 static int hammer_vop_nmknod(struct vop_nmknod_args *); 58 static int hammer_vop_open(struct vop_open_args *); 59 static int hammer_vop_print(struct vop_print_args *); 60 static int hammer_vop_readdir(struct vop_readdir_args *); 61 static int hammer_vop_readlink(struct vop_readlink_args *); 62 static int hammer_vop_nremove(struct vop_nremove_args *); 63 static int hammer_vop_nrename(struct vop_nrename_args *); 64 static int hammer_vop_nrmdir(struct vop_nrmdir_args *); 65 static int hammer_vop_markatime(struct vop_markatime_args *); 66 static int hammer_vop_setattr(struct vop_setattr_args *); 67 static int hammer_vop_strategy(struct vop_strategy_args *); 68 static int hammer_vop_bmap(struct vop_bmap_args *ap); 69 static int hammer_vop_nsymlink(struct vop_nsymlink_args *); 70 static int hammer_vop_nwhiteout(struct vop_nwhiteout_args *); 71 static int hammer_vop_ioctl(struct vop_ioctl_args *); 72 static int hammer_vop_mountctl(struct vop_mountctl_args *); 73 static int hammer_vop_kqfilter (struct vop_kqfilter_args *); 74 75 static int hammer_vop_fifoclose (struct vop_close_args *); 76 static int hammer_vop_fiforead (struct vop_read_args *); 77 static int hammer_vop_fifowrite (struct vop_write_args *); 78 static int hammer_vop_fifokqfilter (struct vop_kqfilter_args *); 79 80 struct vop_ops hammer_vnode_vops = { 81 .vop_default = vop_defaultop, 82 .vop_fsync = hammer_vop_fsync, 83 .vop_getpages = vop_stdgetpages, 84 .vop_putpages = vop_stdputpages, 85 .vop_read = hammer_vop_read, 86 .vop_write = hammer_vop_write, 87 .vop_access = hammer_vop_access, 88 .vop_advlock = hammer_vop_advlock, 89 .vop_close = hammer_vop_close, 90 .vop_ncreate = hammer_vop_ncreate, 91 .vop_getattr = hammer_vop_getattr, 92 .vop_inactive = hammer_vop_inactive, 93 .vop_reclaim = hammer_vop_reclaim, 94 .vop_nresolve = hammer_vop_nresolve, 95 .vop_nlookupdotdot = hammer_vop_nlookupdotdot, 96 .vop_nlink = hammer_vop_nlink, 97 .vop_nmkdir = hammer_vop_nmkdir, 98 .vop_nmknod = hammer_vop_nmknod, 99 .vop_open = hammer_vop_open, 100 .vop_pathconf = vop_stdpathconf, 101 .vop_print = hammer_vop_print, 102 .vop_readdir = hammer_vop_readdir, 103 .vop_readlink = hammer_vop_readlink, 104 .vop_nremove = hammer_vop_nremove, 105 .vop_nrename = hammer_vop_nrename, 106 .vop_nrmdir = hammer_vop_nrmdir, 107 .vop_markatime = hammer_vop_markatime, 108 .vop_setattr = hammer_vop_setattr, 109 .vop_bmap = hammer_vop_bmap, 110 .vop_strategy = hammer_vop_strategy, 111 .vop_nsymlink = hammer_vop_nsymlink, 112 .vop_nwhiteout = hammer_vop_nwhiteout, 113 .vop_ioctl = hammer_vop_ioctl, 114 .vop_mountctl = hammer_vop_mountctl, 115 .vop_kqfilter = hammer_vop_kqfilter 116 }; 117 118 struct vop_ops hammer_spec_vops = { 119 .vop_default = vop_defaultop, 120 .vop_fsync = hammer_vop_fsync, 121 .vop_read = vop_stdnoread, 122 .vop_write = vop_stdnowrite, 123 .vop_access = hammer_vop_access, 124 .vop_close = hammer_vop_close, 125 .vop_markatime = hammer_vop_markatime, 126 .vop_getattr = hammer_vop_getattr, 127 .vop_inactive = hammer_vop_inactive, 128 .vop_reclaim = hammer_vop_reclaim, 129 .vop_setattr = hammer_vop_setattr 130 }; 131 132 struct vop_ops hammer_fifo_vops = { 133 .vop_default = fifo_vnoperate, 134 .vop_fsync = hammer_vop_fsync, 135 .vop_read = hammer_vop_fiforead, 136 .vop_write = hammer_vop_fifowrite, 137 .vop_access = hammer_vop_access, 138 .vop_close = hammer_vop_fifoclose, 139 .vop_markatime = hammer_vop_markatime, 140 .vop_getattr = hammer_vop_getattr, 141 .vop_inactive = hammer_vop_inactive, 142 .vop_reclaim = hammer_vop_reclaim, 143 .vop_setattr = hammer_vop_setattr, 144 .vop_kqfilter = hammer_vop_fifokqfilter 145 }; 146 147 static __inline 148 void 149 hammer_knote(struct vnode *vp, int flags) 150 { 151 if (flags) 152 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags); 153 } 154 155 static int hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch, 156 struct vnode *dvp, struct ucred *cred, 157 int flags, int isdir); 158 static int hammer_vop_strategy_read(struct vop_strategy_args *ap); 159 static int hammer_vop_strategy_write(struct vop_strategy_args *ap); 160 161 /* 162 * hammer_vop_fsync { vp, waitfor } 163 * 164 * fsync() an inode to disk and wait for it to be completely committed 165 * such that the information would not be undone if a crash occured after 166 * return. 167 * 168 * NOTE: HAMMER's fsync()'s are going to remain expensive until we implement 169 * a REDO log. A sysctl is provided to relax HAMMER's fsync() 170 * operation. 171 * 172 * Ultimately the combination of a REDO log and use of fast storage 173 * to front-end cluster caches will make fsync fast, but it aint 174 * here yet. And, in anycase, we need real transactional 175 * all-or-nothing features which are not restricted to a single file. 176 */ 177 static 178 int 179 hammer_vop_fsync(struct vop_fsync_args *ap) 180 { 181 hammer_inode_t ip = VTOI(ap->a_vp); 182 hammer_mount_t hmp = ip->hmp; 183 int waitfor = ap->a_waitfor; 184 int mode; 185 186 lwkt_gettoken(&hmp->fs_token); 187 188 /* 189 * Fsync rule relaxation (default is either full synchronous flush 190 * or REDO semantics with synchronous flush). 191 */ 192 if (ap->a_flags & VOP_FSYNC_SYSCALL) { 193 switch(hammer_fsync_mode) { 194 case 0: 195 mode0: 196 /* no REDO, full synchronous flush */ 197 goto skip; 198 case 1: 199 mode1: 200 /* no REDO, full asynchronous flush */ 201 if (waitfor == MNT_WAIT) 202 waitfor = MNT_NOWAIT; 203 goto skip; 204 case 2: 205 /* REDO semantics, synchronous flush */ 206 if (hmp->version < HAMMER_VOL_VERSION_FOUR) 207 goto mode0; 208 mode = HAMMER_FLUSH_UNDOS_AUTO; 209 break; 210 case 3: 211 /* REDO semantics, relaxed asynchronous flush */ 212 if (hmp->version < HAMMER_VOL_VERSION_FOUR) 213 goto mode1; 214 mode = HAMMER_FLUSH_UNDOS_RELAXED; 215 if (waitfor == MNT_WAIT) 216 waitfor = MNT_NOWAIT; 217 break; 218 case 4: 219 /* ignore the fsync() system call */ 220 lwkt_reltoken(&hmp->fs_token); 221 return(0); 222 default: 223 /* we have to do something */ 224 mode = HAMMER_FLUSH_UNDOS_RELAXED; 225 if (waitfor == MNT_WAIT) 226 waitfor = MNT_NOWAIT; 227 break; 228 } 229 230 /* 231 * Fast fsync only needs to flush the UNDO/REDO fifo if 232 * HAMMER_INODE_REDO is non-zero and the only modifications 233 * made to the file are write or write-extends. 234 */ 235 if ((ip->flags & HAMMER_INODE_REDO) && 236 (ip->flags & HAMMER_INODE_MODMASK_NOREDO) == 0) { 237 ++hammer_count_fsyncs; 238 hammer_flusher_flush_undos(hmp, mode); 239 ip->redo_count = 0; 240 if (ip->vp && (ip->flags & HAMMER_INODE_MODMASK) == 0) 241 vclrisdirty(ip->vp); 242 lwkt_reltoken(&hmp->fs_token); 243 return(0); 244 } 245 246 /* 247 * REDO is enabled by fsync(), the idea being we really only 248 * want to lay down REDO records when programs are using 249 * fsync() heavily. The first fsync() on the file starts 250 * the gravy train going and later fsync()s keep it hot by 251 * resetting the redo_count. 252 * 253 * We weren't running REDOs before now so we have to fall 254 * through and do a full fsync of what we have. 255 */ 256 if (hmp->version >= HAMMER_VOL_VERSION_FOUR && 257 (hmp->flags & HAMMER_MOUNT_REDO_RECOVERY_RUN) == 0) { 258 ip->flags |= HAMMER_INODE_REDO; 259 ip->redo_count = 0; 260 } 261 } 262 skip: 263 264 /* 265 * Do a full flush sequence. 266 * 267 * Attempt to release the vnode while waiting for the inode to 268 * finish flushing. This can really mess up inactive->reclaim 269 * sequences so only do it if the vnode is active. 270 * 271 * WARNING! The VX lock functions must be used. vn_lock() will 272 * fail when this is part of a VOP_RECLAIM sequence. 273 */ 274 ++hammer_count_fsyncs; 275 vfsync(ap->a_vp, waitfor, 1, NULL, NULL); 276 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 277 if (waitfor == MNT_WAIT) { 278 int dorelock; 279 280 if ((ap->a_vp->v_flag & VRECLAIMED) == 0) { 281 vn_unlock(ap->a_vp); 282 dorelock = 1; 283 } else { 284 dorelock = 0; 285 } 286 hammer_wait_inode(ip); 287 if (dorelock) 288 vn_relock(ap->a_vp, LK_EXCLUSIVE); 289 } 290 if (ip->vp && (ip->flags & HAMMER_INODE_MODMASK) == 0) 291 vclrisdirty(ip->vp); 292 lwkt_reltoken(&hmp->fs_token); 293 return (ip->error); 294 } 295 296 /* 297 * hammer_vop_read { vp, uio, ioflag, cred } 298 * 299 * MPSAFE (for the cache safe does not require fs_token) 300 */ 301 static 302 int 303 hammer_vop_read(struct vop_read_args *ap) 304 { 305 struct hammer_transaction trans; 306 hammer_inode_t ip; 307 hammer_mount_t hmp; 308 off_t offset; 309 struct buf *bp; 310 struct uio *uio; 311 int error; 312 int n; 313 int seqcount; 314 int ioseqcount; 315 int blksize; 316 int bigread; 317 int got_trans; 318 size_t resid; 319 320 if (ap->a_vp->v_type != VREG) 321 return (EINVAL); 322 ip = VTOI(ap->a_vp); 323 hmp = ip->hmp; 324 error = 0; 325 got_trans = 0; 326 uio = ap->a_uio; 327 328 /* 329 * Attempt to shortcut directly to the VM object using lwbufs. 330 * This is much faster than instantiating buffer cache buffers. 331 */ 332 resid = uio->uio_resid; 333 error = vop_helper_read_shortcut(ap); 334 hammer_stats_file_read += resid - uio->uio_resid; 335 if (error) 336 return (error); 337 if (uio->uio_resid == 0) 338 goto finished; 339 340 /* 341 * Allow the UIO's size to override the sequential heuristic. 342 */ 343 blksize = hammer_blocksize(uio->uio_offset); 344 seqcount = howmany(uio->uio_resid, MAXBSIZE); 345 ioseqcount = ap->a_ioflag >> IO_SEQSHIFT; 346 if (seqcount < ioseqcount) 347 seqcount = ioseqcount; 348 349 /* 350 * If reading or writing a huge amount of data we have to break 351 * atomicy and allow the operation to be interrupted by a signal 352 * or it can DOS the machine. 353 */ 354 bigread = (uio->uio_resid > 100 * 1024 * 1024); 355 356 /* 357 * Access the data typically in HAMMER_BUFSIZE blocks via the 358 * buffer cache, but HAMMER may use a variable block size based 359 * on the offset. 360 * 361 * XXX Temporary hack, delay the start transaction while we remain 362 * MPSAFE. NOTE: ino_data.size cannot change while vnode is 363 * locked-shared. 364 */ 365 while (uio->uio_resid > 0 && uio->uio_offset < ip->ino_data.size) { 366 int64_t base_offset; 367 int64_t file_limit; 368 369 blksize = hammer_blocksize(uio->uio_offset); 370 offset = (int)uio->uio_offset & (blksize - 1); 371 base_offset = uio->uio_offset - offset; 372 373 if (bigread && (error = hammer_signal_check(ip->hmp)) != 0) 374 break; 375 376 /* 377 * MPSAFE 378 */ 379 bp = getblk(ap->a_vp, base_offset, blksize, 0, 0); 380 if ((bp->b_flags & (B_INVAL | B_CACHE | B_RAM)) == B_CACHE) { 381 bp->b_flags &= ~B_AGE; 382 error = 0; 383 goto skip; 384 } 385 if (ap->a_ioflag & IO_NRDELAY) { 386 bqrelse(bp); 387 return (EWOULDBLOCK); 388 } 389 390 /* 391 * MPUNSAFE 392 */ 393 if (got_trans == 0) { 394 hammer_start_transaction(&trans, ip->hmp); 395 got_trans = 1; 396 } 397 398 /* 399 * NOTE: A valid bp has already been acquired, but was not 400 * B_CACHE. 401 */ 402 if (hammer_cluster_enable) { 403 /* 404 * Use file_limit to prevent cluster_read() from 405 * creating buffers of the wrong block size past 406 * the demarc. 407 */ 408 file_limit = ip->ino_data.size; 409 if (base_offset < HAMMER_XDEMARC && 410 file_limit > HAMMER_XDEMARC) { 411 file_limit = HAMMER_XDEMARC; 412 } 413 error = cluster_readx(ap->a_vp, 414 file_limit, base_offset, 415 blksize, B_NOTMETA, 416 uio->uio_resid, 417 seqcount * MAXBSIZE, 418 &bp); 419 } else { 420 error = breadnx(ap->a_vp, base_offset, 421 blksize, B_NOTMETA, 422 NULL, NULL, 0, &bp); 423 } 424 if (error) { 425 brelse(bp); 426 break; 427 } 428 skip: 429 if ((hammer_debug_io & 0x0001) && (bp->b_flags & B_IOISSUED)) { 430 hdkprintf("zone2_offset %016jx read file %016jx@%016jx\n", 431 (intmax_t)bp->b_bio2.bio_offset, 432 (intmax_t)ip->obj_id, 433 (intmax_t)bp->b_loffset); 434 } 435 bp->b_flags &= ~B_IOISSUED; 436 if (blksize == HAMMER_XBUFSIZE) 437 bp->b_flags |= B_CLUSTEROK; 438 439 n = blksize - offset; 440 if (n > uio->uio_resid) 441 n = uio->uio_resid; 442 if (n > ip->ino_data.size - uio->uio_offset) 443 n = (int)(ip->ino_data.size - uio->uio_offset); 444 445 /* 446 * Set B_AGE, data has a lower priority than meta-data. 447 * 448 * Use a hold/unlock/drop sequence to run the uiomove 449 * with the buffer unlocked, avoiding deadlocks against 450 * read()s on mmap()'d spaces. 451 */ 452 bp->b_flags |= B_AGE; 453 error = uiomovebp(bp, (char *)bp->b_data + offset, n, uio); 454 bqrelse(bp); 455 456 if (error) 457 break; 458 hammer_stats_file_read += n; 459 } 460 461 finished: 462 463 /* 464 * Try to update the atime with just the inode lock for maximum 465 * concurrency. If we can't shortcut it we have to get the full 466 * blown transaction. 467 */ 468 if (got_trans == 0 && hammer_update_atime_quick(ip) < 0) { 469 hammer_start_transaction(&trans, ip->hmp); 470 got_trans = 1; 471 } 472 473 if (got_trans) { 474 if ((ip->flags & HAMMER_INODE_RO) == 0 && 475 (ip->hmp->mp->mnt_flag & MNT_NOATIME) == 0) { 476 lwkt_gettoken(&hmp->fs_token); 477 ip->ino_data.atime = trans.time; 478 hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME); 479 hammer_done_transaction(&trans); 480 lwkt_reltoken(&hmp->fs_token); 481 } else { 482 hammer_done_transaction(&trans); 483 } 484 } 485 return (error); 486 } 487 488 /* 489 * hammer_vop_write { vp, uio, ioflag, cred } 490 */ 491 static 492 int 493 hammer_vop_write(struct vop_write_args *ap) 494 { 495 struct hammer_transaction trans; 496 hammer_inode_t ip; 497 hammer_mount_t hmp; 498 thread_t td; 499 struct vnode *vp; 500 struct uio *uio; 501 int offset; 502 off_t base_offset; 503 int64_t cluster_eof; 504 struct buf *bp; 505 int kflags; 506 int error; 507 int n; 508 int flags; 509 int seqcount; 510 int bigwrite; 511 512 vp = ap->a_vp; 513 if (vp->v_type != VREG) 514 return (EINVAL); 515 ip = VTOI(ap->a_vp); 516 hmp = ip->hmp; 517 error = 0; 518 kflags = 0; 519 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 520 521 if (ip->flags & HAMMER_INODE_RO) 522 return (EROFS); 523 524 /* 525 * Create a transaction to cover the operations we perform. 526 */ 527 hammer_start_transaction(&trans, hmp); 528 uio = ap->a_uio; 529 530 /* 531 * Use v_lastwrite_ts if file not open for writing 532 * (i.e. a late msync) 533 */ 534 if (uio->uio_segflg == UIO_NOCOPY) { 535 if (vp->v_flag & VLASTWRITETS) { 536 trans.time = vp->v_lastwrite_ts.tv_sec * 1000000 + 537 vp->v_lastwrite_ts.tv_nsec / 1000; 538 } else { 539 trans.time = ip->ino_data.mtime; 540 } 541 } else { 542 vclrflags(vp, VLASTWRITETS); 543 } 544 545 /* 546 * Check append mode 547 */ 548 if (ap->a_ioflag & IO_APPEND) 549 uio->uio_offset = ip->ino_data.size; 550 551 /* 552 * Check for illegal write offsets. Valid range is 0...2^63-1. 553 * 554 * NOTE: the base_off assignment is required to work around what 555 * I consider to be a GCC-4 optimization bug. 556 */ 557 if (uio->uio_offset < 0) { 558 hammer_done_transaction(&trans); 559 return (EFBIG); 560 } 561 base_offset = uio->uio_offset + uio->uio_resid; /* work around gcc-4 */ 562 if (uio->uio_resid > 0 && base_offset <= uio->uio_offset) { 563 hammer_done_transaction(&trans); 564 return (EFBIG); 565 } 566 567 if (uio->uio_resid > 0 && (td = uio->uio_td) != NULL && td->td_proc && 568 base_offset > td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 569 hammer_done_transaction(&trans); 570 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ); 571 return (EFBIG); 572 } 573 574 /* 575 * If reading or writing a huge amount of data we have to break 576 * atomicy and allow the operation to be interrupted by a signal 577 * or it can DOS the machine. 578 * 579 * Preset redo_count so we stop generating REDOs earlier if the 580 * limit is exceeded. 581 * 582 * redo_count is heuristical, SMP races are ok 583 */ 584 bigwrite = (uio->uio_resid > 100 * 1024 * 1024); 585 if ((ip->flags & HAMMER_INODE_REDO) && 586 ip->redo_count < hammer_limit_redo) { 587 ip->redo_count += uio->uio_resid; 588 } 589 590 /* 591 * Access the data typically in HAMMER_BUFSIZE blocks via the 592 * buffer cache, but HAMMER may use a variable block size based 593 * on the offset. 594 */ 595 while (uio->uio_resid > 0) { 596 int fixsize = 0; 597 int blksize; 598 int blkmask; 599 int trivial; 600 int endofblk; 601 off_t nsize; 602 603 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE)) != 0) 604 break; 605 if (bigwrite && (error = hammer_signal_check(hmp)) != 0) 606 break; 607 608 blksize = hammer_blocksize(uio->uio_offset); 609 610 /* 611 * Control the number of pending records associated with 612 * this inode. If too many have accumulated start a 613 * flush. Try to maintain a pipeline with the flusher. 614 * 615 * NOTE: It is possible for other sources to grow the 616 * records but not necessarily issue another flush, 617 * so use a timeout and ensure that a re-flush occurs. 618 */ 619 if (ip->rsv_recs >= hammer_limit_inode_recs) { 620 lwkt_gettoken(&hmp->fs_token); 621 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 622 while (ip->rsv_recs >= hammer_limit_inode_recs * 2) { 623 ip->flags |= HAMMER_INODE_RECSW; 624 tsleep(&ip->rsv_recs, 0, "hmrwww", hz); 625 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 626 } 627 lwkt_reltoken(&hmp->fs_token); 628 } 629 630 /* 631 * Do not allow HAMMER to blow out the buffer cache. Very 632 * large UIOs can lockout other processes due to bwillwrite() 633 * mechanics. 634 * 635 * The hammer inode is not locked during these operations. 636 * The vnode is locked which can interfere with the pageout 637 * daemon for non-UIO_NOCOPY writes but should not interfere 638 * with the buffer cache. Even so, we cannot afford to 639 * allow the pageout daemon to build up too many dirty buffer 640 * cache buffers. 641 * 642 * Only call this if we aren't being recursively called from 643 * a virtual disk device (vn), else we may deadlock. 644 */ 645 if ((ap->a_ioflag & IO_RECURSE) == 0) 646 bwillwrite(blksize); 647 648 /* 649 * Calculate the blocksize at the current offset and figure 650 * out how much we can actually write. 651 */ 652 blkmask = blksize - 1; 653 offset = (int)uio->uio_offset & blkmask; 654 base_offset = uio->uio_offset & ~(int64_t)blkmask; 655 n = blksize - offset; 656 if (n > uio->uio_resid) { 657 n = uio->uio_resid; 658 endofblk = 0; 659 } else { 660 endofblk = 1; 661 } 662 nsize = uio->uio_offset + n; 663 if (nsize > ip->ino_data.size) { 664 if (uio->uio_offset > ip->ino_data.size) 665 trivial = 0; 666 else 667 trivial = NVEXTF_TRIVIAL; 668 nvextendbuf(ap->a_vp, 669 ip->ino_data.size, 670 nsize, 671 hammer_blocksize(ip->ino_data.size), 672 hammer_blocksize(nsize), 673 hammer_blockoff(ip->ino_data.size), 674 hammer_blockoff(nsize), 675 trivial); 676 fixsize = 1; 677 kflags |= NOTE_EXTEND; 678 } 679 680 if (uio->uio_segflg == UIO_NOCOPY) { 681 /* 682 * Issuing a write with the same data backing the 683 * buffer. Instantiate the buffer to collect the 684 * backing vm pages, then read-in any missing bits. 685 * 686 * This case is used by vop_stdputpages(). 687 */ 688 bp = getblk(ap->a_vp, base_offset, 689 blksize, GETBLK_BHEAVY, 0); 690 if ((bp->b_flags & B_CACHE) == 0) { 691 bqrelse(bp); 692 error = bread(ap->a_vp, base_offset, 693 blksize, &bp); 694 } 695 } else if (offset == 0 && uio->uio_resid >= blksize) { 696 /* 697 * Even though we are entirely overwriting the buffer 698 * we may still have to zero it out to avoid a 699 * mmap/write visibility issue. 700 */ 701 bp = getblk(ap->a_vp, base_offset, blksize, GETBLK_BHEAVY, 0); 702 if ((bp->b_flags & B_CACHE) == 0) 703 vfs_bio_clrbuf(bp); 704 } else if (base_offset >= ip->ino_data.size) { 705 /* 706 * If the base offset of the buffer is beyond the 707 * file EOF, we don't have to issue a read. 708 */ 709 bp = getblk(ap->a_vp, base_offset, 710 blksize, GETBLK_BHEAVY, 0); 711 vfs_bio_clrbuf(bp); 712 } else { 713 /* 714 * Partial overwrite, read in any missing bits then 715 * replace the portion being written. 716 */ 717 error = bread(ap->a_vp, base_offset, blksize, &bp); 718 if (error == 0) 719 bheavy(bp); 720 } 721 if (error == 0) 722 error = uiomovebp(bp, bp->b_data + offset, n, uio); 723 724 lwkt_gettoken(&hmp->fs_token); 725 726 /* 727 * Generate REDO records if enabled and redo_count will not 728 * exceeded the limit. 729 * 730 * If redo_count exceeds the limit we stop generating records 731 * and clear HAMMER_INODE_REDO. This will cause the next 732 * fsync() to do a full meta-data sync instead of just an 733 * UNDO/REDO fifo update. 734 * 735 * When clearing HAMMER_INODE_REDO any pre-existing REDOs 736 * will still be tracked. The tracks will be terminated 737 * when the related meta-data (including possible data 738 * modifications which are not tracked via REDO) is 739 * flushed. 740 */ 741 if ((ip->flags & HAMMER_INODE_REDO) && error == 0) { 742 if (ip->redo_count < hammer_limit_redo) { 743 bp->b_flags |= B_VFSFLAG1; 744 error = hammer_generate_redo(&trans, ip, 745 base_offset + offset, 746 HAMMER_REDO_WRITE, 747 bp->b_data + offset, 748 (size_t)n); 749 } else { 750 ip->flags &= ~HAMMER_INODE_REDO; 751 } 752 } 753 754 /* 755 * If we screwed up we have to undo any VM size changes we 756 * made. 757 */ 758 if (error) { 759 brelse(bp); 760 if (fixsize) { 761 nvtruncbuf(ap->a_vp, ip->ino_data.size, 762 hammer_blocksize(ip->ino_data.size), 763 hammer_blockoff(ip->ino_data.size), 764 0); 765 } 766 lwkt_reltoken(&hmp->fs_token); 767 break; 768 } 769 kflags |= NOTE_WRITE; 770 hammer_stats_file_write += n; 771 if (blksize == HAMMER_XBUFSIZE) 772 bp->b_flags |= B_CLUSTEROK; 773 if (ip->ino_data.size < uio->uio_offset) { 774 ip->ino_data.size = uio->uio_offset; 775 flags = HAMMER_INODE_SDIRTY; 776 } else { 777 flags = 0; 778 } 779 ip->ino_data.mtime = trans.time; 780 flags |= HAMMER_INODE_MTIME | HAMMER_INODE_BUFS; 781 hammer_modify_inode(&trans, ip, flags); 782 783 /* 784 * Once we dirty the buffer any cached zone-X offset 785 * becomes invalid. HAMMER NOTE: no-history mode cannot 786 * allow overwriting over the same data sector unless 787 * we provide UNDOs for the old data, which we don't. 788 */ 789 bp->b_bio2.bio_offset = NOOFFSET; 790 791 lwkt_reltoken(&hmp->fs_token); 792 793 /* 794 * Final buffer disposition. 795 * 796 * Because meta-data updates are deferred, HAMMER is 797 * especially sensitive to excessive bdwrite()s because 798 * the I/O stream is not broken up by disk reads. So the 799 * buffer cache simply cannot keep up. 800 * 801 * WARNING! blksize is variable. cluster_write() is 802 * expected to not blow up if it encounters 803 * buffers that do not match the passed blksize. 804 * 805 * NOTE! Hammer shouldn't need to bawrite()/cluster_write(). 806 * The ip->rsv_recs check should burst-flush the data. 807 * If we queue it immediately the buf could be left 808 * locked on the device queue for a very long time. 809 * 810 * However, failing to flush a dirty buffer out when 811 * issued from the pageout daemon can result in a low 812 * memory deadlock against bio_page_alloc(), so we 813 * have to bawrite() on IO_ASYNC as well. 814 * 815 * NOTE! To avoid degenerate stalls due to mismatched block 816 * sizes we only honor IO_DIRECT on the write which 817 * abuts the end of the buffer. However, we must 818 * honor IO_SYNC in case someone is silly enough to 819 * configure a HAMMER file as swap, or when HAMMER 820 * is serving NFS (for commits). Ick ick. 821 */ 822 bp->b_flags |= B_AGE; 823 if (blksize == HAMMER_XBUFSIZE) 824 bp->b_flags |= B_CLUSTEROK; 825 826 if (ap->a_ioflag & IO_SYNC) { 827 bwrite(bp); 828 } else if ((ap->a_ioflag & IO_DIRECT) && endofblk) { 829 bawrite(bp); 830 } else if (ap->a_ioflag & IO_ASYNC) { 831 bawrite(bp); 832 } else if (hammer_cluster_enable && 833 !(ap->a_vp->v_mount->mnt_flag & MNT_NOCLUSTERW)) { 834 if (base_offset < HAMMER_XDEMARC) 835 cluster_eof = hammer_blockdemarc(base_offset, 836 ip->ino_data.size); 837 else 838 cluster_eof = ip->ino_data.size; 839 cluster_write(bp, cluster_eof, blksize, seqcount); 840 } else { 841 bdwrite(bp); 842 } 843 } 844 hammer_done_transaction(&trans); 845 hammer_knote(ap->a_vp, kflags); 846 847 return (error); 848 } 849 850 /* 851 * hammer_vop_access { vp, mode, cred } 852 * 853 * MPSAFE - does not require fs_token 854 */ 855 static 856 int 857 hammer_vop_access(struct vop_access_args *ap) 858 { 859 hammer_inode_t ip = VTOI(ap->a_vp); 860 uid_t uid; 861 gid_t gid; 862 int error; 863 864 uid = hammer_to_unix_xid(&ip->ino_data.uid); 865 gid = hammer_to_unix_xid(&ip->ino_data.gid); 866 867 error = vop_helper_access(ap, uid, gid, ip->ino_data.mode, 868 ip->ino_data.uflags); 869 return (error); 870 } 871 872 /* 873 * hammer_vop_advlock { vp, id, op, fl, flags } 874 * 875 * MPSAFE - does not require fs_token 876 */ 877 static 878 int 879 hammer_vop_advlock(struct vop_advlock_args *ap) 880 { 881 hammer_inode_t ip = VTOI(ap->a_vp); 882 883 return (lf_advlock(ap, &ip->advlock, ip->ino_data.size)); 884 } 885 886 /* 887 * hammer_vop_close { vp, fflag } 888 * 889 * We can only sync-on-close for normal closes. XXX disabled for now. 890 */ 891 static 892 int 893 hammer_vop_close(struct vop_close_args *ap) 894 { 895 #if 0 896 struct vnode *vp = ap->a_vp; 897 hammer_inode_t ip = VTOI(vp); 898 int waitfor; 899 if (ip->flags & (HAMMER_INODE_CLOSESYNC|HAMMER_INODE_CLOSEASYNC)) { 900 if (vn_islocked(vp) == LK_EXCLUSIVE && 901 (vp->v_flag & (VINACTIVE|VRECLAIMED)) == 0) { 902 if (ip->flags & HAMMER_INODE_CLOSESYNC) 903 waitfor = MNT_WAIT; 904 else 905 waitfor = MNT_NOWAIT; 906 ip->flags &= ~(HAMMER_INODE_CLOSESYNC | 907 HAMMER_INODE_CLOSEASYNC); 908 VOP_FSYNC(vp, MNT_NOWAIT, waitfor); 909 } 910 } 911 #endif 912 return (vop_stdclose(ap)); 913 } 914 915 /* 916 * hammer_vop_ncreate { nch, dvp, vpp, cred, vap } 917 * 918 * The operating system has already ensured that the directory entry 919 * does not exist and done all appropriate namespace locking. 920 */ 921 static 922 int 923 hammer_vop_ncreate(struct vop_ncreate_args *ap) 924 { 925 struct hammer_transaction trans; 926 hammer_inode_t dip; 927 hammer_inode_t nip; 928 struct nchandle *nch; 929 hammer_mount_t hmp; 930 int error; 931 932 nch = ap->a_nch; 933 dip = VTOI(ap->a_dvp); 934 hmp = dip->hmp; 935 936 if (dip->flags & HAMMER_INODE_RO) 937 return (EROFS); 938 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 939 return (error); 940 941 /* 942 * Create a transaction to cover the operations we perform. 943 */ 944 lwkt_gettoken(&hmp->fs_token); 945 hammer_start_transaction(&trans, hmp); 946 947 /* 948 * Create a new filesystem object of the requested type. The 949 * returned inode will be referenced and shared-locked to prevent 950 * it from being moved to the flusher. 951 */ 952 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 953 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 954 NULL, &nip); 955 if (error) { 956 hkprintf("hammer_create_inode error %d\n", error); 957 hammer_done_transaction(&trans); 958 *ap->a_vpp = NULL; 959 lwkt_reltoken(&hmp->fs_token); 960 return (error); 961 } 962 963 /* 964 * Add the new filesystem object to the directory. This will also 965 * bump the inode's link count. 966 */ 967 error = hammer_ip_add_direntry(&trans, dip, 968 nch->ncp->nc_name, nch->ncp->nc_nlen, 969 nip); 970 if (error) 971 hkprintf("hammer_ip_add_direntry error %d\n", error); 972 973 /* 974 * Finish up. 975 */ 976 if (error) { 977 hammer_rel_inode(nip, 0); 978 hammer_done_transaction(&trans); 979 *ap->a_vpp = NULL; 980 } else { 981 error = hammer_get_vnode(nip, ap->a_vpp); 982 hammer_done_transaction(&trans); 983 hammer_rel_inode(nip, 0); 984 if (error == 0) { 985 cache_setunresolved(ap->a_nch); 986 cache_setvp(ap->a_nch, *ap->a_vpp); 987 } 988 hammer_knote(ap->a_dvp, NOTE_WRITE); 989 } 990 lwkt_reltoken(&hmp->fs_token); 991 return (error); 992 } 993 994 /* 995 * hammer_vop_getattr { vp, vap } 996 * 997 * Retrieve an inode's attribute information. When accessing inodes 998 * historically we fake the atime field to ensure consistent results. 999 * The atime field is stored in the B-Tree element and allowed to be 1000 * updated without cycling the element. 1001 * 1002 * MPSAFE - does not require fs_token 1003 */ 1004 static 1005 int 1006 hammer_vop_getattr(struct vop_getattr_args *ap) 1007 { 1008 hammer_inode_t ip = VTOI(ap->a_vp); 1009 struct vattr *vap = ap->a_vap; 1010 1011 /* 1012 * We want the fsid to be different when accessing a filesystem 1013 * with different as-of's so programs like diff don't think 1014 * the files are the same. 1015 * 1016 * We also want the fsid to be the same when comparing snapshots, 1017 * or when comparing mirrors (which might be backed by different 1018 * physical devices). HAMMER fsids are based on the PFS's 1019 * shared_uuid field. 1020 * 1021 * XXX there is a chance of collision here. The va_fsid reported 1022 * by stat is different from the more involved fsid used in the 1023 * mount structure. 1024 */ 1025 hammer_lock_sh(&ip->lock); 1026 vap->va_fsid = ip->pfsm->fsid_udev ^ (uint32_t)ip->obj_asof ^ 1027 (uint32_t)(ip->obj_asof >> 32); 1028 1029 vap->va_fileid = ip->ino_leaf.base.obj_id; 1030 vap->va_mode = ip->ino_data.mode; 1031 vap->va_nlink = ip->ino_data.nlinks; 1032 vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid); 1033 vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid); 1034 vap->va_rmajor = 0; 1035 vap->va_rminor = 0; 1036 vap->va_size = ip->ino_data.size; 1037 1038 /* 1039 * Special case for @@PFS softlinks. The actual size of the 1040 * expanded softlink is "@@0x%016llx:%05d" == 26 bytes. 1041 * or for MAX_TID is "@@-1:%05d" == 10 bytes. 1042 * 1043 * Note that userspace hammer command does not allow users to 1044 * create a @@PFS softlink under an existing other PFS (id!=0) 1045 * so the ip localization here for @@PFS softlink is always 0. 1046 */ 1047 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_SOFTLINK && 1048 ip->ino_data.size == 10 && 1049 ip->obj_asof == HAMMER_MAX_TID && 1050 ip->obj_localization == HAMMER_DEF_LOCALIZATION && 1051 strncmp(ip->ino_data.ext.symlink, "@@PFS", 5) == 0) { 1052 if (hammer_is_pfs_slave(&ip->pfsm->pfsd)) 1053 vap->va_size = 26; 1054 else 1055 vap->va_size = 10; 1056 } 1057 1058 /* 1059 * We must provide a consistent atime and mtime for snapshots 1060 * so people can do a 'tar cf - ... | md5' on them and get 1061 * consistent results. 1062 */ 1063 if (ip->flags & HAMMER_INODE_RO) { 1064 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_atime); 1065 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_mtime); 1066 } else { 1067 hammer_time_to_timespec(ip->ino_data.atime, &vap->va_atime); 1068 hammer_time_to_timespec(ip->ino_data.mtime, &vap->va_mtime); 1069 } 1070 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_ctime); 1071 vap->va_flags = ip->ino_data.uflags; 1072 vap->va_gen = 1; /* hammer inums are unique for all time */ 1073 vap->va_blocksize = HAMMER_BUFSIZE; 1074 if (ip->ino_data.size >= HAMMER_XDEMARC) { 1075 vap->va_bytes = HAMMER_XBUFSIZE64_DOALIGN(ip->ino_data.size); 1076 } else if (ip->ino_data.size > HAMMER_HBUFSIZE) { 1077 vap->va_bytes = HAMMER_BUFSIZE64_DOALIGN(ip->ino_data.size); 1078 } else { 1079 vap->va_bytes = HAMMER_DATA_DOALIGN(ip->ino_data.size); 1080 } 1081 1082 vap->va_type = hammer_get_vnode_type(ip->ino_data.obj_type); 1083 vap->va_filerev = 0; /* XXX */ 1084 vap->va_uid_uuid = ip->ino_data.uid; 1085 vap->va_gid_uuid = ip->ino_data.gid; 1086 vap->va_fsid_uuid = ip->hmp->fsid; 1087 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID | 1088 VA_FSID_UUID_VALID; 1089 1090 switch (ip->ino_data.obj_type) { 1091 case HAMMER_OBJTYPE_CDEV: 1092 case HAMMER_OBJTYPE_BDEV: 1093 vap->va_rmajor = ip->ino_data.rmajor; 1094 vap->va_rminor = ip->ino_data.rminor; 1095 break; 1096 default: 1097 break; 1098 } 1099 hammer_unlock(&ip->lock); 1100 return(0); 1101 } 1102 1103 /* 1104 * hammer_vop_nresolve { nch, dvp, cred } 1105 * 1106 * Locate the requested directory entry. 1107 */ 1108 static 1109 int 1110 hammer_vop_nresolve(struct vop_nresolve_args *ap) 1111 { 1112 struct hammer_transaction trans; 1113 struct namecache *ncp; 1114 hammer_mount_t hmp; 1115 hammer_inode_t dip; 1116 hammer_inode_t ip; 1117 hammer_tid_t asof; 1118 struct hammer_cursor cursor; 1119 struct vnode *vp; 1120 int64_t namekey; 1121 int error; 1122 int i; 1123 int nlen; 1124 int flags; 1125 int ispfs; 1126 int64_t obj_id; 1127 uint32_t localization; 1128 uint32_t max_iterations; 1129 1130 /* 1131 * Misc initialization, plus handle as-of name extensions. Look for 1132 * the '@@' extension. Note that as-of files and directories cannot 1133 * be modified. 1134 */ 1135 dip = VTOI(ap->a_dvp); 1136 ncp = ap->a_nch->ncp; 1137 asof = dip->obj_asof; 1138 localization = dip->obj_localization; /* for code consistency */ 1139 nlen = ncp->nc_nlen; 1140 flags = dip->flags & HAMMER_INODE_RO; 1141 ispfs = 0; 1142 hmp = dip->hmp; 1143 1144 lwkt_gettoken(&hmp->fs_token); 1145 hammer_simple_transaction(&trans, hmp); 1146 1147 for (i = 0; i < nlen; ++i) { 1148 if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') { 1149 error = hammer_str_to_tid(ncp->nc_name + i + 2, 1150 &ispfs, &asof, &localization); 1151 if (error != 0) { 1152 i = nlen; 1153 break; 1154 } 1155 if (asof != HAMMER_MAX_TID) 1156 flags |= HAMMER_INODE_RO; 1157 break; 1158 } 1159 } 1160 nlen = i; 1161 1162 /* 1163 * If this is a PFS we dive into the PFS root inode 1164 */ 1165 if (ispfs && nlen == 0) { 1166 ip = hammer_get_inode(&trans, dip, HAMMER_OBJID_ROOT, 1167 asof, localization, 1168 flags, &error); 1169 if (error == 0) { 1170 error = hammer_get_vnode(ip, &vp); 1171 hammer_rel_inode(ip, 0); 1172 } else { 1173 vp = NULL; 1174 } 1175 if (error == 0) { 1176 vn_unlock(vp); 1177 cache_setvp(ap->a_nch, vp); 1178 vrele(vp); 1179 } 1180 goto done; 1181 } 1182 1183 /* 1184 * If there is no path component the time extension is relative to dip. 1185 * e.g. "fubar/@@<snapshot>" 1186 * 1187 * "." is handled by the kernel, but ".@@<snapshot>" is not. 1188 * e.g. "fubar/.@@<snapshot>" 1189 * 1190 * ".." is handled by the kernel. We do not currently handle 1191 * "..@<snapshot>". 1192 */ 1193 if (nlen == 0 || (nlen == 1 && ncp->nc_name[0] == '.')) { 1194 ip = hammer_get_inode(&trans, dip, dip->obj_id, 1195 asof, dip->obj_localization, 1196 flags, &error); 1197 if (error == 0) { 1198 error = hammer_get_vnode(ip, &vp); 1199 hammer_rel_inode(ip, 0); 1200 } else { 1201 vp = NULL; 1202 } 1203 if (error == 0) { 1204 vn_unlock(vp); 1205 cache_setvp(ap->a_nch, vp); 1206 vrele(vp); 1207 } 1208 goto done; 1209 } 1210 1211 /* 1212 * Calculate the namekey and setup the key range for the scan. This 1213 * works kinda like a chained hash table where the lower 32 bits 1214 * of the namekey synthesize the chain. 1215 * 1216 * The key range is inclusive of both key_beg and key_end. 1217 */ 1218 namekey = hammer_direntry_namekey(dip, ncp->nc_name, nlen, 1219 &max_iterations); 1220 1221 error = hammer_init_cursor(&trans, &cursor, &dip->cache[1], dip); 1222 cursor.key_beg.localization = dip->obj_localization | 1223 hammer_dir_localization(dip); 1224 cursor.key_beg.obj_id = dip->obj_id; 1225 cursor.key_beg.key = namekey; 1226 cursor.key_beg.create_tid = 0; 1227 cursor.key_beg.delete_tid = 0; 1228 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 1229 cursor.key_beg.obj_type = 0; 1230 1231 cursor.key_end = cursor.key_beg; 1232 cursor.key_end.key += max_iterations; 1233 cursor.asof = asof; 1234 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 1235 1236 /* 1237 * Scan all matching records (the chain), locate the one matching 1238 * the requested path component. 1239 * 1240 * The hammer_ip_*() functions merge in-memory records with on-disk 1241 * records for the purposes of the search. 1242 */ 1243 obj_id = 0; 1244 localization = HAMMER_DEF_LOCALIZATION; 1245 1246 if (error == 0) { 1247 error = hammer_ip_first(&cursor); 1248 while (error == 0) { 1249 error = hammer_ip_resolve_data(&cursor); 1250 if (error) 1251 break; 1252 if (nlen == cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF && 1253 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) { 1254 obj_id = cursor.data->entry.obj_id; 1255 localization = cursor.data->entry.localization; 1256 break; 1257 } 1258 error = hammer_ip_next(&cursor); 1259 } 1260 } 1261 hammer_done_cursor(&cursor); 1262 1263 /* 1264 * Lookup the obj_id. This should always succeed. If it does not 1265 * the filesystem may be damaged and we return a dummy inode. 1266 */ 1267 if (error == 0) { 1268 ip = hammer_get_inode(&trans, dip, obj_id, 1269 asof, localization, 1270 flags, &error); 1271 if (error == ENOENT) { 1272 hkprintf("WARNING: Missing inode for dirent \"%s\"\n" 1273 "\tobj_id = %016jx, asof=%016jx, lo=%08x\n", 1274 ncp->nc_name, 1275 (intmax_t)obj_id, (intmax_t)asof, 1276 localization); 1277 error = 0; 1278 ip = hammer_get_dummy_inode(&trans, dip, obj_id, 1279 asof, localization, 1280 flags, &error); 1281 } 1282 if (error == 0) { 1283 error = hammer_get_vnode(ip, &vp); 1284 hammer_rel_inode(ip, 0); 1285 } else { 1286 vp = NULL; 1287 } 1288 if (error == 0) { 1289 vn_unlock(vp); 1290 cache_setvp(ap->a_nch, vp); 1291 vrele(vp); 1292 } 1293 } else if (error == ENOENT) { 1294 cache_setvp(ap->a_nch, NULL); 1295 } 1296 done: 1297 hammer_done_transaction(&trans); 1298 lwkt_reltoken(&hmp->fs_token); 1299 return (error); 1300 } 1301 1302 /* 1303 * hammer_vop_nlookupdotdot { dvp, vpp, cred } 1304 * 1305 * Locate the parent directory of a directory vnode. 1306 * 1307 * dvp is referenced but not locked. *vpp must be returned referenced and 1308 * locked. A parent_obj_id of 0 indicates that we are at the root. 1309 * 1310 * NOTE: as-of sequences are not linked into the directory structure. If 1311 * we are at the root with a different asof then the mount point, reload 1312 * the same directory with the mount point's asof. I'm not sure what this 1313 * will do to NFS. We encode ASOF stamps in NFS file handles so it might not 1314 * get confused, but it hasn't been tested. 1315 */ 1316 static 1317 int 1318 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap) 1319 { 1320 struct hammer_transaction trans; 1321 hammer_inode_t dip; 1322 hammer_inode_t ip; 1323 hammer_mount_t hmp; 1324 int64_t parent_obj_id; 1325 uint32_t parent_obj_localization; 1326 hammer_tid_t asof; 1327 int error; 1328 1329 dip = VTOI(ap->a_dvp); 1330 asof = dip->obj_asof; 1331 hmp = dip->hmp; 1332 1333 /* 1334 * Whos are parent? This could be the root of a pseudo-filesystem 1335 * whos parent is in another localization domain. 1336 */ 1337 lwkt_gettoken(&hmp->fs_token); 1338 parent_obj_id = dip->ino_data.parent_obj_id; 1339 if (dip->obj_id == HAMMER_OBJID_ROOT) 1340 parent_obj_localization = HAMMER_DEF_LOCALIZATION; 1341 else 1342 parent_obj_localization = dip->obj_localization; 1343 1344 /* 1345 * It's probably a PFS root when dip->ino_data.parent_obj_id is 0. 1346 */ 1347 if (parent_obj_id == 0) { 1348 if (dip->obj_id == HAMMER_OBJID_ROOT && 1349 asof != hmp->asof) { 1350 parent_obj_id = dip->obj_id; 1351 asof = hmp->asof; 1352 *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK); 1353 ksnprintf(*ap->a_fakename, 19, "0x%016jx", 1354 (intmax_t)dip->obj_asof); 1355 } else { 1356 *ap->a_vpp = NULL; 1357 lwkt_reltoken(&hmp->fs_token); 1358 return ENOENT; 1359 } 1360 } 1361 1362 hammer_simple_transaction(&trans, hmp); 1363 1364 ip = hammer_get_inode(&trans, dip, parent_obj_id, 1365 asof, parent_obj_localization, 1366 dip->flags, &error); 1367 if (ip) { 1368 error = hammer_get_vnode(ip, ap->a_vpp); 1369 hammer_rel_inode(ip, 0); 1370 } else { 1371 *ap->a_vpp = NULL; 1372 } 1373 hammer_done_transaction(&trans); 1374 lwkt_reltoken(&hmp->fs_token); 1375 return (error); 1376 } 1377 1378 /* 1379 * hammer_vop_nlink { nch, dvp, vp, cred } 1380 */ 1381 static 1382 int 1383 hammer_vop_nlink(struct vop_nlink_args *ap) 1384 { 1385 struct hammer_transaction trans; 1386 hammer_inode_t dip; 1387 hammer_inode_t ip; 1388 struct nchandle *nch; 1389 hammer_mount_t hmp; 1390 int error; 1391 1392 if (ap->a_dvp->v_mount != ap->a_vp->v_mount) 1393 return(EXDEV); 1394 1395 nch = ap->a_nch; 1396 dip = VTOI(ap->a_dvp); 1397 ip = VTOI(ap->a_vp); 1398 hmp = dip->hmp; 1399 1400 if (dip->obj_localization != ip->obj_localization) 1401 return(EXDEV); 1402 1403 if (dip->flags & HAMMER_INODE_RO) 1404 return (EROFS); 1405 if (ip->flags & HAMMER_INODE_RO) 1406 return (EROFS); 1407 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1408 return (error); 1409 1410 /* 1411 * Create a transaction to cover the operations we perform. 1412 */ 1413 lwkt_gettoken(&hmp->fs_token); 1414 hammer_start_transaction(&trans, hmp); 1415 1416 /* 1417 * Add the filesystem object to the directory. Note that neither 1418 * dip nor ip are referenced or locked, but their vnodes are 1419 * referenced. This function will bump the inode's link count. 1420 */ 1421 error = hammer_ip_add_direntry(&trans, dip, 1422 nch->ncp->nc_name, nch->ncp->nc_nlen, 1423 ip); 1424 1425 /* 1426 * Finish up. 1427 */ 1428 if (error == 0) { 1429 cache_setunresolved(nch); 1430 cache_setvp(nch, ap->a_vp); 1431 } 1432 hammer_done_transaction(&trans); 1433 hammer_knote(ap->a_vp, NOTE_LINK); 1434 hammer_knote(ap->a_dvp, NOTE_WRITE); 1435 lwkt_reltoken(&hmp->fs_token); 1436 return (error); 1437 } 1438 1439 /* 1440 * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap } 1441 * 1442 * The operating system has already ensured that the directory entry 1443 * does not exist and done all appropriate namespace locking. 1444 */ 1445 static 1446 int 1447 hammer_vop_nmkdir(struct vop_nmkdir_args *ap) 1448 { 1449 struct hammer_transaction trans; 1450 hammer_inode_t dip; 1451 hammer_inode_t nip; 1452 struct nchandle *nch; 1453 hammer_mount_t hmp; 1454 int error; 1455 1456 nch = ap->a_nch; 1457 dip = VTOI(ap->a_dvp); 1458 hmp = dip->hmp; 1459 1460 if (dip->flags & HAMMER_INODE_RO) 1461 return (EROFS); 1462 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1463 return (error); 1464 1465 /* 1466 * Create a transaction to cover the operations we perform. 1467 */ 1468 lwkt_gettoken(&hmp->fs_token); 1469 hammer_start_transaction(&trans, hmp); 1470 1471 /* 1472 * Create a new filesystem object of the requested type. The 1473 * returned inode will be referenced but not locked. 1474 */ 1475 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 1476 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 1477 NULL, &nip); 1478 if (error) { 1479 hammer_done_transaction(&trans); 1480 *ap->a_vpp = NULL; 1481 lwkt_reltoken(&hmp->fs_token); 1482 return (error); 1483 } 1484 /* 1485 * Add the new filesystem object to the directory. This will also 1486 * bump the inode's link count. 1487 */ 1488 error = hammer_ip_add_direntry(&trans, dip, 1489 nch->ncp->nc_name, nch->ncp->nc_nlen, 1490 nip); 1491 if (error) 1492 hkprintf("hammer_mkdir (add) error %d\n", error); 1493 1494 /* 1495 * Finish up. 1496 */ 1497 if (error) { 1498 hammer_rel_inode(nip, 0); 1499 *ap->a_vpp = NULL; 1500 } else { 1501 error = hammer_get_vnode(nip, ap->a_vpp); 1502 hammer_rel_inode(nip, 0); 1503 if (error == 0) { 1504 cache_setunresolved(ap->a_nch); 1505 cache_setvp(ap->a_nch, *ap->a_vpp); 1506 } 1507 } 1508 hammer_done_transaction(&trans); 1509 if (error == 0) 1510 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1511 lwkt_reltoken(&hmp->fs_token); 1512 return (error); 1513 } 1514 1515 /* 1516 * hammer_vop_nmknod { nch, dvp, vpp, cred, vap } 1517 * 1518 * The operating system has already ensured that the directory entry 1519 * does not exist and done all appropriate namespace locking. 1520 */ 1521 static 1522 int 1523 hammer_vop_nmknod(struct vop_nmknod_args *ap) 1524 { 1525 struct hammer_transaction trans; 1526 hammer_inode_t dip; 1527 hammer_inode_t nip; 1528 struct nchandle *nch; 1529 hammer_mount_t hmp; 1530 int error; 1531 1532 nch = ap->a_nch; 1533 dip = VTOI(ap->a_dvp); 1534 hmp = dip->hmp; 1535 1536 if (dip->flags & HAMMER_INODE_RO) 1537 return (EROFS); 1538 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1539 return (error); 1540 1541 /* 1542 * Create a transaction to cover the operations we perform. 1543 */ 1544 lwkt_gettoken(&hmp->fs_token); 1545 hammer_start_transaction(&trans, hmp); 1546 1547 /* 1548 * Create a new filesystem object of the requested type. The 1549 * returned inode will be referenced but not locked. 1550 * 1551 * If mknod specifies a directory a pseudo-fs is created. 1552 */ 1553 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 1554 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 1555 NULL, &nip); 1556 if (error) { 1557 hammer_done_transaction(&trans); 1558 *ap->a_vpp = NULL; 1559 lwkt_reltoken(&hmp->fs_token); 1560 return (error); 1561 } 1562 1563 /* 1564 * Add the new filesystem object to the directory. This will also 1565 * bump the inode's link count. 1566 */ 1567 error = hammer_ip_add_direntry(&trans, dip, 1568 nch->ncp->nc_name, nch->ncp->nc_nlen, 1569 nip); 1570 1571 /* 1572 * Finish up. 1573 */ 1574 if (error) { 1575 hammer_rel_inode(nip, 0); 1576 *ap->a_vpp = NULL; 1577 } else { 1578 error = hammer_get_vnode(nip, ap->a_vpp); 1579 hammer_rel_inode(nip, 0); 1580 if (error == 0) { 1581 cache_setunresolved(ap->a_nch); 1582 cache_setvp(ap->a_nch, *ap->a_vpp); 1583 } 1584 } 1585 hammer_done_transaction(&trans); 1586 if (error == 0) 1587 hammer_knote(ap->a_dvp, NOTE_WRITE); 1588 lwkt_reltoken(&hmp->fs_token); 1589 return (error); 1590 } 1591 1592 /* 1593 * hammer_vop_open { vp, mode, cred, fp } 1594 * 1595 * MPSAFE (does not require fs_token) 1596 */ 1597 static 1598 int 1599 hammer_vop_open(struct vop_open_args *ap) 1600 { 1601 hammer_inode_t ip; 1602 1603 ip = VTOI(ap->a_vp); 1604 1605 if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO)) 1606 return (EROFS); 1607 return(vop_stdopen(ap)); 1608 } 1609 1610 /* 1611 * hammer_vop_print { vp } 1612 */ 1613 static 1614 int 1615 hammer_vop_print(struct vop_print_args *ap) 1616 { 1617 return EOPNOTSUPP; 1618 } 1619 1620 /* 1621 * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies } 1622 */ 1623 static 1624 int 1625 hammer_vop_readdir(struct vop_readdir_args *ap) 1626 { 1627 struct hammer_transaction trans; 1628 struct hammer_cursor cursor; 1629 hammer_inode_t ip; 1630 hammer_mount_t hmp; 1631 struct uio *uio; 1632 hammer_base_elm_t base; 1633 int error; 1634 int cookie_index; 1635 int ncookies; 1636 off_t *cookies; 1637 off_t saveoff; 1638 int r; 1639 int dtype; 1640 1641 ip = VTOI(ap->a_vp); 1642 uio = ap->a_uio; 1643 saveoff = uio->uio_offset; 1644 hmp = ip->hmp; 1645 1646 if (ap->a_ncookies) { 1647 ncookies = uio->uio_resid / 16 + 1; 1648 if (ncookies > 1024) 1649 ncookies = 1024; 1650 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 1651 cookie_index = 0; 1652 } else { 1653 ncookies = -1; 1654 cookies = NULL; 1655 cookie_index = 0; 1656 } 1657 1658 lwkt_gettoken(&hmp->fs_token); 1659 hammer_simple_transaction(&trans, hmp); 1660 1661 /* 1662 * Handle artificial entries 1663 * 1664 * It should be noted that the minimum value for a directory 1665 * hash key on-media is 0x0000000100000000, so we can use anything 1666 * less then that to represent our 'special' key space. 1667 */ 1668 error = 0; 1669 if (saveoff == 0) { 1670 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, "."); 1671 if (r) 1672 goto done; 1673 if (cookies) 1674 cookies[cookie_index] = saveoff; 1675 ++saveoff; 1676 ++cookie_index; 1677 if (cookie_index == ncookies) 1678 goto done; 1679 } 1680 if (saveoff == 1) { 1681 if (ip->ino_data.parent_obj_id) { 1682 r = vop_write_dirent(&error, uio, 1683 ip->ino_data.parent_obj_id, 1684 DT_DIR, 2, ".."); 1685 } else { 1686 r = vop_write_dirent(&error, uio, 1687 ip->obj_id, DT_DIR, 2, ".."); 1688 } 1689 if (r) 1690 goto done; 1691 if (cookies) 1692 cookies[cookie_index] = saveoff; 1693 ++saveoff; 1694 ++cookie_index; 1695 if (cookie_index == ncookies) 1696 goto done; 1697 } 1698 1699 /* 1700 * Key range (begin and end inclusive) to scan. Directory keys 1701 * directly translate to a 64 bit 'seek' position. 1702 */ 1703 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 1704 cursor.key_beg.localization = ip->obj_localization | 1705 hammer_dir_localization(ip); 1706 cursor.key_beg.obj_id = ip->obj_id; 1707 cursor.key_beg.create_tid = 0; 1708 cursor.key_beg.delete_tid = 0; 1709 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 1710 cursor.key_beg.obj_type = 0; 1711 cursor.key_beg.key = saveoff; 1712 1713 cursor.key_end = cursor.key_beg; 1714 cursor.key_end.key = HAMMER_MAX_KEY; 1715 cursor.asof = ip->obj_asof; 1716 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 1717 1718 error = hammer_ip_first(&cursor); 1719 1720 while (error == 0) { 1721 error = hammer_ip_resolve_data(&cursor); 1722 if (error) 1723 break; 1724 base = &cursor.leaf->base; 1725 saveoff = base->key; 1726 KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF); 1727 1728 if (base->obj_id != ip->obj_id) 1729 hpanic("bad record at %p", cursor.node); 1730 1731 dtype = hammer_get_dtype(cursor.leaf->base.obj_type); 1732 r = vop_write_dirent( 1733 &error, uio, cursor.data->entry.obj_id, 1734 dtype, 1735 cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF , 1736 (void *)cursor.data->entry.name); 1737 if (r) 1738 break; 1739 ++saveoff; 1740 if (cookies) 1741 cookies[cookie_index] = base->key; 1742 ++cookie_index; 1743 if (cookie_index == ncookies) 1744 break; 1745 error = hammer_ip_next(&cursor); 1746 } 1747 hammer_done_cursor(&cursor); 1748 1749 done: 1750 hammer_done_transaction(&trans); 1751 1752 if (ap->a_eofflag) 1753 *ap->a_eofflag = (error == ENOENT); 1754 uio->uio_offset = saveoff; 1755 if (error && cookie_index == 0) { 1756 if (error == ENOENT) 1757 error = 0; 1758 if (cookies) { 1759 kfree(cookies, M_TEMP); 1760 *ap->a_ncookies = 0; 1761 *ap->a_cookies = NULL; 1762 } 1763 } else { 1764 if (error == ENOENT) 1765 error = 0; 1766 if (cookies) { 1767 *ap->a_ncookies = cookie_index; 1768 *ap->a_cookies = cookies; 1769 } 1770 } 1771 lwkt_reltoken(&hmp->fs_token); 1772 return(error); 1773 } 1774 1775 /* 1776 * hammer_vop_readlink { vp, uio, cred } 1777 */ 1778 static 1779 int 1780 hammer_vop_readlink(struct vop_readlink_args *ap) 1781 { 1782 struct hammer_transaction trans; 1783 struct hammer_cursor cursor; 1784 hammer_inode_t ip; 1785 hammer_mount_t hmp; 1786 char buf[32]; 1787 uint32_t localization; 1788 hammer_pseudofs_inmem_t pfsm; 1789 int error; 1790 1791 ip = VTOI(ap->a_vp); 1792 hmp = ip->hmp; 1793 1794 lwkt_gettoken(&hmp->fs_token); 1795 1796 /* 1797 * Shortcut if the symlink data was stuffed into ino_data. 1798 * 1799 * Also expand special "@@PFS%05d" softlinks (expansion only 1800 * occurs for non-historical (current) accesses made from the 1801 * primary filesystem). 1802 * 1803 * Note that userspace hammer command does not allow users to 1804 * create a @@PFS softlink under an existing other PFS (id!=0) 1805 * so the ip localization here for @@PFS softlink is always 0. 1806 */ 1807 if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) { 1808 char *ptr; 1809 int bytes; 1810 1811 ptr = ip->ino_data.ext.symlink; 1812 bytes = (int)ip->ino_data.size; 1813 if (bytes == 10 && 1814 ip->obj_asof == HAMMER_MAX_TID && 1815 ip->obj_localization == HAMMER_DEF_LOCALIZATION && 1816 strncmp(ptr, "@@PFS", 5) == 0) { 1817 hammer_simple_transaction(&trans, hmp); 1818 bcopy(ptr + 5, buf, 5); 1819 buf[5] = 0; 1820 localization = pfs_to_lo(strtoul(buf, NULL, 10)); 1821 pfsm = hammer_load_pseudofs(&trans, localization, 1822 &error); 1823 if (error == 0) { 1824 if (hammer_is_pfs_slave(&pfsm->pfsd)) { 1825 /* vap->va_size == 26 */ 1826 ksnprintf(buf, sizeof(buf), 1827 "@@0x%016jx:%05d", 1828 (intmax_t)pfsm->pfsd.sync_end_tid, 1829 lo_to_pfs(localization)); 1830 } else { 1831 /* vap->va_size == 10 */ 1832 ksnprintf(buf, sizeof(buf), 1833 "@@-1:%05d", 1834 lo_to_pfs(localization)); 1835 } 1836 ptr = buf; 1837 bytes = strlen(buf); 1838 } 1839 if (pfsm) 1840 hammer_rel_pseudofs(hmp, pfsm); 1841 hammer_done_transaction(&trans); 1842 } 1843 error = uiomove(ptr, bytes, ap->a_uio); 1844 lwkt_reltoken(&hmp->fs_token); 1845 return(error); 1846 } 1847 1848 /* 1849 * Long version 1850 */ 1851 hammer_simple_transaction(&trans, hmp); 1852 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 1853 1854 /* 1855 * Key range (begin and end inclusive) to scan. Directory keys 1856 * directly translate to a 64 bit 'seek' position. 1857 */ 1858 cursor.key_beg.localization = ip->obj_localization | 1859 HAMMER_LOCALIZE_MISC; 1860 cursor.key_beg.obj_id = ip->obj_id; 1861 cursor.key_beg.create_tid = 0; 1862 cursor.key_beg.delete_tid = 0; 1863 cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX; 1864 cursor.key_beg.obj_type = 0; 1865 cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK; 1866 cursor.asof = ip->obj_asof; 1867 cursor.flags |= HAMMER_CURSOR_ASOF; 1868 1869 error = hammer_ip_lookup(&cursor); 1870 if (error == 0) { 1871 error = hammer_ip_resolve_data(&cursor); 1872 if (error == 0) { 1873 KKASSERT(cursor.leaf->data_len >= 1874 HAMMER_SYMLINK_NAME_OFF); 1875 error = uiomove(cursor.data->symlink.name, 1876 cursor.leaf->data_len - 1877 HAMMER_SYMLINK_NAME_OFF, 1878 ap->a_uio); 1879 } 1880 } 1881 hammer_done_cursor(&cursor); 1882 hammer_done_transaction(&trans); 1883 lwkt_reltoken(&hmp->fs_token); 1884 return(error); 1885 } 1886 1887 /* 1888 * hammer_vop_nremove { nch, dvp, cred } 1889 */ 1890 static 1891 int 1892 hammer_vop_nremove(struct vop_nremove_args *ap) 1893 { 1894 struct hammer_transaction trans; 1895 hammer_inode_t dip; 1896 hammer_mount_t hmp; 1897 int error; 1898 1899 dip = VTOI(ap->a_dvp); 1900 hmp = dip->hmp; 1901 1902 if (hammer_nohistory(dip) == 0 && 1903 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 1904 return (error); 1905 } 1906 1907 lwkt_gettoken(&hmp->fs_token); 1908 hammer_start_transaction(&trans, hmp); 1909 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 0); 1910 hammer_done_transaction(&trans); 1911 if (error == 0) 1912 hammer_knote(ap->a_dvp, NOTE_WRITE); 1913 lwkt_reltoken(&hmp->fs_token); 1914 return (error); 1915 } 1916 1917 /* 1918 * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred } 1919 */ 1920 static 1921 int 1922 hammer_vop_nrename(struct vop_nrename_args *ap) 1923 { 1924 struct hammer_transaction trans; 1925 struct namecache *fncp; 1926 struct namecache *tncp; 1927 hammer_inode_t fdip; 1928 hammer_inode_t tdip; 1929 hammer_inode_t ip; 1930 hammer_mount_t hmp; 1931 struct hammer_cursor cursor; 1932 int64_t namekey; 1933 uint32_t max_iterations; 1934 int nlen, error; 1935 1936 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount) 1937 return(EXDEV); 1938 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount) 1939 return(EXDEV); 1940 1941 fdip = VTOI(ap->a_fdvp); 1942 tdip = VTOI(ap->a_tdvp); 1943 fncp = ap->a_fnch->ncp; 1944 tncp = ap->a_tnch->ncp; 1945 ip = VTOI(fncp->nc_vp); 1946 KKASSERT(ip != NULL); 1947 1948 hmp = ip->hmp; 1949 1950 if (fdip->obj_localization != tdip->obj_localization) 1951 return(EXDEV); 1952 if (fdip->obj_localization != ip->obj_localization) 1953 return(EXDEV); 1954 1955 if (fdip->flags & HAMMER_INODE_RO) 1956 return (EROFS); 1957 if (tdip->flags & HAMMER_INODE_RO) 1958 return (EROFS); 1959 if (ip->flags & HAMMER_INODE_RO) 1960 return (EROFS); 1961 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1962 return (error); 1963 1964 lwkt_gettoken(&hmp->fs_token); 1965 hammer_start_transaction(&trans, hmp); 1966 1967 /* 1968 * Remove tncp from the target directory and then link ip as 1969 * tncp. XXX pass trans to dounlink 1970 * 1971 * Force the inode sync-time to match the transaction so it is 1972 * in-sync with the creation of the target directory entry. 1973 */ 1974 error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp, 1975 ap->a_cred, 0, -1); 1976 if (error == 0 || error == ENOENT) { 1977 error = hammer_ip_add_direntry(&trans, tdip, 1978 tncp->nc_name, tncp->nc_nlen, 1979 ip); 1980 if (error == 0) { 1981 ip->ino_data.parent_obj_id = tdip->obj_id; 1982 ip->ino_data.ctime = trans.time; 1983 hammer_modify_inode(&trans, ip, HAMMER_INODE_DDIRTY); 1984 } 1985 } 1986 if (error) 1987 goto failed; /* XXX */ 1988 1989 /* 1990 * Locate the record in the originating directory and remove it. 1991 * 1992 * Calculate the namekey and setup the key range for the scan. This 1993 * works kinda like a chained hash table where the lower 32 bits 1994 * of the namekey synthesize the chain. 1995 * 1996 * The key range is inclusive of both key_beg and key_end. 1997 */ 1998 namekey = hammer_direntry_namekey(fdip, fncp->nc_name, fncp->nc_nlen, 1999 &max_iterations); 2000 retry: 2001 hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip); 2002 cursor.key_beg.localization = fdip->obj_localization | 2003 hammer_dir_localization(fdip); 2004 cursor.key_beg.obj_id = fdip->obj_id; 2005 cursor.key_beg.key = namekey; 2006 cursor.key_beg.create_tid = 0; 2007 cursor.key_beg.delete_tid = 0; 2008 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 2009 cursor.key_beg.obj_type = 0; 2010 2011 cursor.key_end = cursor.key_beg; 2012 cursor.key_end.key += max_iterations; 2013 cursor.asof = fdip->obj_asof; 2014 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 2015 2016 /* 2017 * Scan all matching records (the chain), locate the one matching 2018 * the requested path component. 2019 * 2020 * The hammer_ip_*() functions merge in-memory records with on-disk 2021 * records for the purposes of the search. 2022 */ 2023 error = hammer_ip_first(&cursor); 2024 while (error == 0) { 2025 if (hammer_ip_resolve_data(&cursor) != 0) 2026 break; 2027 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF; 2028 KKASSERT(nlen > 0); 2029 if (fncp->nc_nlen == nlen && 2030 bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) { 2031 break; 2032 } 2033 error = hammer_ip_next(&cursor); 2034 } 2035 2036 /* 2037 * If all is ok we have to get the inode so we can adjust nlinks. 2038 * 2039 * WARNING: hammer_ip_del_direntry() may have to terminate the 2040 * cursor to avoid a recursion. It's ok to call hammer_done_cursor() 2041 * twice. 2042 */ 2043 if (error == 0) 2044 error = hammer_ip_del_direntry(&trans, &cursor, fdip, ip); 2045 2046 /* 2047 * XXX A deadlock here will break rename's atomicy for the purposes 2048 * of crash recovery. 2049 */ 2050 if (error == EDEADLK) { 2051 hammer_done_cursor(&cursor); 2052 goto retry; 2053 } 2054 2055 /* 2056 * Cleanup and tell the kernel that the rename succeeded. 2057 * 2058 * NOTE: ip->vp, if non-NULL, cannot be directly referenced 2059 * without formally acquiring the vp since the vp might 2060 * have zero refs on it, or in the middle of a reclaim, 2061 * etc. 2062 */ 2063 hammer_done_cursor(&cursor); 2064 if (error == 0) { 2065 cache_rename(ap->a_fnch, ap->a_tnch); 2066 hammer_knote(ap->a_fdvp, NOTE_WRITE); 2067 hammer_knote(ap->a_tdvp, NOTE_WRITE); 2068 while (ip->vp) { 2069 struct vnode *vp; 2070 2071 error = hammer_get_vnode(ip, &vp); 2072 if (error == 0 && vp) { 2073 vn_unlock(vp); 2074 hammer_knote(ip->vp, NOTE_RENAME); 2075 vrele(vp); 2076 break; 2077 } 2078 hdkprintf("ip/vp race2 avoided\n"); 2079 } 2080 } 2081 2082 failed: 2083 hammer_done_transaction(&trans); 2084 lwkt_reltoken(&hmp->fs_token); 2085 return (error); 2086 } 2087 2088 /* 2089 * hammer_vop_nrmdir { nch, dvp, cred } 2090 */ 2091 static 2092 int 2093 hammer_vop_nrmdir(struct vop_nrmdir_args *ap) 2094 { 2095 struct hammer_transaction trans; 2096 hammer_inode_t dip; 2097 hammer_mount_t hmp; 2098 int error; 2099 2100 dip = VTOI(ap->a_dvp); 2101 hmp = dip->hmp; 2102 2103 if (hammer_nohistory(dip) == 0 && 2104 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 2105 return (error); 2106 } 2107 2108 lwkt_gettoken(&hmp->fs_token); 2109 hammer_start_transaction(&trans, hmp); 2110 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 1); 2111 hammer_done_transaction(&trans); 2112 if (error == 0) 2113 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 2114 lwkt_reltoken(&hmp->fs_token); 2115 return (error); 2116 } 2117 2118 /* 2119 * hammer_vop_markatime { vp, cred } 2120 */ 2121 static 2122 int 2123 hammer_vop_markatime(struct vop_markatime_args *ap) 2124 { 2125 struct hammer_transaction trans; 2126 hammer_inode_t ip; 2127 hammer_mount_t hmp; 2128 2129 ip = VTOI(ap->a_vp); 2130 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 2131 return (EROFS); 2132 if (ip->flags & HAMMER_INODE_RO) 2133 return (EROFS); 2134 hmp = ip->hmp; 2135 if (hmp->mp->mnt_flag & MNT_NOATIME) 2136 return (0); 2137 lwkt_gettoken(&hmp->fs_token); 2138 hammer_start_transaction(&trans, hmp); 2139 2140 ip->ino_data.atime = trans.time; 2141 hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME); 2142 hammer_done_transaction(&trans); 2143 hammer_knote(ap->a_vp, NOTE_ATTRIB); 2144 lwkt_reltoken(&hmp->fs_token); 2145 return (0); 2146 } 2147 2148 /* 2149 * hammer_vop_setattr { vp, vap, cred } 2150 */ 2151 static 2152 int 2153 hammer_vop_setattr(struct vop_setattr_args *ap) 2154 { 2155 struct hammer_transaction trans; 2156 hammer_inode_t ip; 2157 struct vattr *vap; 2158 hammer_mount_t hmp; 2159 int modflags; 2160 int error; 2161 int truncating; 2162 int blksize; 2163 int kflags; 2164 #if 0 2165 int64_t aligned_size; 2166 #endif 2167 uint32_t flags; 2168 2169 vap = ap->a_vap; 2170 ip = ap->a_vp->v_data; 2171 modflags = 0; 2172 kflags = 0; 2173 hmp = ip->hmp; 2174 2175 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 2176 return(EROFS); 2177 if (ip->flags & HAMMER_INODE_RO) 2178 return (EROFS); 2179 if (hammer_nohistory(ip) == 0 && 2180 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 2181 return (error); 2182 } 2183 2184 lwkt_gettoken(&hmp->fs_token); 2185 hammer_start_transaction(&trans, hmp); 2186 error = 0; 2187 2188 if (vap->va_flags != VNOVAL) { 2189 flags = ip->ino_data.uflags; 2190 error = vop_helper_setattr_flags(&flags, vap->va_flags, 2191 hammer_to_unix_xid(&ip->ino_data.uid), 2192 ap->a_cred); 2193 if (error == 0) { 2194 if (ip->ino_data.uflags != flags) { 2195 ip->ino_data.uflags = flags; 2196 ip->ino_data.ctime = trans.time; 2197 modflags |= HAMMER_INODE_DDIRTY; 2198 kflags |= NOTE_ATTRIB; 2199 } 2200 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) { 2201 error = 0; 2202 goto done; 2203 } 2204 } 2205 goto done; 2206 } 2207 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) { 2208 error = EPERM; 2209 goto done; 2210 } 2211 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 2212 mode_t cur_mode = ip->ino_data.mode; 2213 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid); 2214 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid); 2215 hammer_uuid_t uuid_uid; 2216 hammer_uuid_t uuid_gid; 2217 2218 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid, 2219 ap->a_cred, 2220 &cur_uid, &cur_gid, &cur_mode); 2221 if (error == 0) { 2222 hammer_guid_to_uuid(&uuid_uid, cur_uid); 2223 hammer_guid_to_uuid(&uuid_gid, cur_gid); 2224 if (kuuid_compare(&uuid_uid, &ip->ino_data.uid) || 2225 kuuid_compare(&uuid_gid, &ip->ino_data.gid) || 2226 ip->ino_data.mode != cur_mode) { 2227 ip->ino_data.uid = uuid_uid; 2228 ip->ino_data.gid = uuid_gid; 2229 ip->ino_data.mode = cur_mode; 2230 ip->ino_data.ctime = trans.time; 2231 modflags |= HAMMER_INODE_DDIRTY; 2232 } 2233 kflags |= NOTE_ATTRIB; 2234 } 2235 } 2236 while (vap->va_size != VNOVAL && ip->ino_data.size != vap->va_size) { 2237 switch(ap->a_vp->v_type) { 2238 case VREG: 2239 if (vap->va_size == ip->ino_data.size) 2240 break; 2241 2242 /* 2243 * Log the operation if in fast-fsync mode or if 2244 * there are unterminated redo write records present. 2245 * 2246 * The second check is needed so the recovery code 2247 * properly truncates write redos even if nominal 2248 * REDO operations is turned off due to excessive 2249 * writes, because the related records might be 2250 * destroyed and never lay down a TERM_WRITE. 2251 */ 2252 if ((ip->flags & HAMMER_INODE_REDO) || 2253 (ip->flags & HAMMER_INODE_RDIRTY)) { 2254 error = hammer_generate_redo(&trans, ip, 2255 vap->va_size, 2256 HAMMER_REDO_TRUNC, 2257 NULL, 0); 2258 } 2259 blksize = hammer_blocksize(vap->va_size); 2260 2261 /* 2262 * XXX break atomicy, we can deadlock the backend 2263 * if we do not release the lock. Probably not a 2264 * big deal here. 2265 */ 2266 if (vap->va_size < ip->ino_data.size) { 2267 nvtruncbuf(ap->a_vp, vap->va_size, 2268 blksize, 2269 hammer_blockoff(vap->va_size), 2270 0); 2271 truncating = 1; 2272 kflags |= NOTE_WRITE; 2273 } else { 2274 nvextendbuf(ap->a_vp, 2275 ip->ino_data.size, 2276 vap->va_size, 2277 hammer_blocksize(ip->ino_data.size), 2278 hammer_blocksize(vap->va_size), 2279 hammer_blockoff(ip->ino_data.size), 2280 hammer_blockoff(vap->va_size), 2281 0); 2282 truncating = 0; 2283 kflags |= NOTE_WRITE | NOTE_EXTEND; 2284 } 2285 ip->ino_data.size = vap->va_size; 2286 ip->ino_data.mtime = trans.time; 2287 /* XXX safe to use SDIRTY instead of DDIRTY here? */ 2288 modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY; 2289 vclrflags(ap->a_vp, VLASTWRITETS); 2290 2291 /* 2292 * On-media truncation is cached in the inode until 2293 * the inode is synchronized. We must immediately 2294 * handle any frontend records. 2295 */ 2296 if (truncating) { 2297 hammer_ip_frontend_trunc(ip, vap->va_size); 2298 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) { 2299 ip->flags |= HAMMER_INODE_TRUNCATED; 2300 ip->trunc_off = vap->va_size; 2301 hammer_inode_dirty(ip); 2302 } else if (ip->trunc_off > vap->va_size) { 2303 ip->trunc_off = vap->va_size; 2304 } 2305 } 2306 2307 #if 0 2308 /* 2309 * When truncating, nvtruncbuf() may have cleaned out 2310 * a portion of the last block on-disk in the buffer 2311 * cache. We must clean out any frontend records 2312 * for blocks beyond the new last block. 2313 */ 2314 aligned_size = (vap->va_size + (blksize - 1)) & 2315 ~(int64_t)(blksize - 1); 2316 if (truncating && vap->va_size < aligned_size) { 2317 aligned_size -= blksize; 2318 hammer_ip_frontend_trunc(ip, aligned_size); 2319 } 2320 #endif 2321 break; 2322 case VDATABASE: 2323 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) { 2324 ip->flags |= HAMMER_INODE_TRUNCATED; 2325 ip->trunc_off = vap->va_size; 2326 hammer_inode_dirty(ip); 2327 } else if (ip->trunc_off > vap->va_size) { 2328 ip->trunc_off = vap->va_size; 2329 } 2330 hammer_ip_frontend_trunc(ip, vap->va_size); 2331 ip->ino_data.size = vap->va_size; 2332 ip->ino_data.mtime = trans.time; 2333 modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY; 2334 vclrflags(ap->a_vp, VLASTWRITETS); 2335 kflags |= NOTE_ATTRIB; 2336 break; 2337 default: 2338 error = EINVAL; 2339 goto done; 2340 } 2341 break; 2342 } 2343 if (vap->va_atime.tv_sec != VNOVAL) { 2344 ip->ino_data.atime = hammer_timespec_to_time(&vap->va_atime); 2345 modflags |= HAMMER_INODE_ATIME; 2346 kflags |= NOTE_ATTRIB; 2347 } 2348 if (vap->va_mtime.tv_sec != VNOVAL) { 2349 ip->ino_data.mtime = hammer_timespec_to_time(&vap->va_mtime); 2350 modflags |= HAMMER_INODE_MTIME; 2351 kflags |= NOTE_ATTRIB; 2352 vclrflags(ap->a_vp, VLASTWRITETS); 2353 } 2354 if (vap->va_mode != (mode_t)VNOVAL) { 2355 mode_t cur_mode = ip->ino_data.mode; 2356 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid); 2357 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid); 2358 2359 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred, 2360 cur_uid, cur_gid, &cur_mode); 2361 if (error == 0 && ip->ino_data.mode != cur_mode) { 2362 ip->ino_data.mode = cur_mode; 2363 ip->ino_data.ctime = trans.time; 2364 modflags |= HAMMER_INODE_DDIRTY; 2365 kflags |= NOTE_ATTRIB; 2366 } 2367 } 2368 done: 2369 if (error == 0) 2370 hammer_modify_inode(&trans, ip, modflags); 2371 hammer_done_transaction(&trans); 2372 hammer_knote(ap->a_vp, kflags); 2373 lwkt_reltoken(&hmp->fs_token); 2374 return (error); 2375 } 2376 2377 /* 2378 * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target } 2379 */ 2380 static 2381 int 2382 hammer_vop_nsymlink(struct vop_nsymlink_args *ap) 2383 { 2384 struct hammer_transaction trans; 2385 hammer_inode_t dip; 2386 hammer_inode_t nip; 2387 hammer_record_t record; 2388 struct nchandle *nch; 2389 hammer_mount_t hmp; 2390 int error; 2391 int bytes; 2392 2393 ap->a_vap->va_type = VLNK; 2394 2395 nch = ap->a_nch; 2396 dip = VTOI(ap->a_dvp); 2397 hmp = dip->hmp; 2398 2399 if (dip->flags & HAMMER_INODE_RO) 2400 return (EROFS); 2401 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 2402 return (error); 2403 2404 /* 2405 * Create a transaction to cover the operations we perform. 2406 */ 2407 lwkt_gettoken(&hmp->fs_token); 2408 hammer_start_transaction(&trans, hmp); 2409 2410 /* 2411 * Create a new filesystem object of the requested type. The 2412 * returned inode will be referenced but not locked. 2413 */ 2414 2415 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 2416 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 2417 NULL, &nip); 2418 if (error) { 2419 hammer_done_transaction(&trans); 2420 *ap->a_vpp = NULL; 2421 lwkt_reltoken(&hmp->fs_token); 2422 return (error); 2423 } 2424 2425 /* 2426 * Add a record representing the symlink. symlink stores the link 2427 * as pure data, not a string, and is no \0 terminated. 2428 */ 2429 if (error == 0) { 2430 bytes = strlen(ap->a_target); 2431 2432 if (bytes <= HAMMER_INODE_BASESYMLEN) { 2433 bcopy(ap->a_target, nip->ino_data.ext.symlink, bytes); 2434 } else { 2435 record = hammer_alloc_mem_record(nip, bytes); 2436 record->type = HAMMER_MEM_RECORD_GENERAL; 2437 2438 record->leaf.base.localization = nip->obj_localization | 2439 HAMMER_LOCALIZE_MISC; 2440 record->leaf.base.key = HAMMER_FIXKEY_SYMLINK; 2441 record->leaf.base.rec_type = HAMMER_RECTYPE_FIX; 2442 record->leaf.data_len = bytes; 2443 KKASSERT(HAMMER_SYMLINK_NAME_OFF == 0); 2444 bcopy(ap->a_target, record->data->symlink.name, bytes); 2445 error = hammer_ip_add_record(&trans, record); 2446 } 2447 2448 /* 2449 * Set the file size to the length of the link. 2450 */ 2451 if (error == 0) { 2452 nip->ino_data.size = bytes; 2453 hammer_modify_inode(&trans, nip, HAMMER_INODE_DDIRTY); 2454 } 2455 } 2456 if (error == 0) 2457 error = hammer_ip_add_direntry(&trans, dip, nch->ncp->nc_name, 2458 nch->ncp->nc_nlen, nip); 2459 2460 /* 2461 * Finish up. 2462 */ 2463 if (error) { 2464 hammer_rel_inode(nip, 0); 2465 *ap->a_vpp = NULL; 2466 } else { 2467 error = hammer_get_vnode(nip, ap->a_vpp); 2468 hammer_rel_inode(nip, 0); 2469 if (error == 0) { 2470 cache_setunresolved(ap->a_nch); 2471 cache_setvp(ap->a_nch, *ap->a_vpp); 2472 hammer_knote(ap->a_dvp, NOTE_WRITE); 2473 } 2474 } 2475 hammer_done_transaction(&trans); 2476 lwkt_reltoken(&hmp->fs_token); 2477 return (error); 2478 } 2479 2480 /* 2481 * hammer_vop_nwhiteout { nch, dvp, cred, flags } 2482 */ 2483 static 2484 int 2485 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap) 2486 { 2487 struct hammer_transaction trans; 2488 hammer_inode_t dip; 2489 hammer_mount_t hmp; 2490 int error; 2491 2492 dip = VTOI(ap->a_dvp); 2493 hmp = dip->hmp; 2494 2495 if (hammer_nohistory(dip) == 0 && 2496 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) { 2497 return (error); 2498 } 2499 2500 lwkt_gettoken(&hmp->fs_token); 2501 hammer_start_transaction(&trans, hmp); 2502 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, 2503 ap->a_cred, ap->a_flags, -1); 2504 hammer_done_transaction(&trans); 2505 lwkt_reltoken(&hmp->fs_token); 2506 2507 return (error); 2508 } 2509 2510 /* 2511 * hammer_vop_ioctl { vp, command, data, fflag, cred } 2512 */ 2513 static 2514 int 2515 hammer_vop_ioctl(struct vop_ioctl_args *ap) 2516 { 2517 hammer_inode_t ip = ap->a_vp->v_data; 2518 hammer_mount_t hmp = ip->hmp; 2519 int error; 2520 2521 lwkt_gettoken(&hmp->fs_token); 2522 error = hammer_ioctl(ip, ap->a_command, ap->a_data, 2523 ap->a_fflag, ap->a_cred); 2524 lwkt_reltoken(&hmp->fs_token); 2525 return (error); 2526 } 2527 2528 static 2529 int 2530 hammer_vop_mountctl(struct vop_mountctl_args *ap) 2531 { 2532 static const struct mountctl_opt extraopt[] = { 2533 { HMNT_NOHISTORY, "nohistory" }, 2534 { HMNT_MASTERID, "master" }, 2535 { HMNT_NOMIRROR, "nomirror" }, 2536 { 0, NULL} 2537 2538 }; 2539 hammer_mount_t hmp; 2540 struct mount *mp; 2541 int usedbytes; 2542 int error; 2543 2544 error = 0; 2545 usedbytes = 0; 2546 mp = ap->a_head.a_ops->head.vv_mount; 2547 KKASSERT(mp->mnt_data != NULL); 2548 hmp = (hammer_mount_t)mp->mnt_data; 2549 2550 lwkt_gettoken(&hmp->fs_token); 2551 2552 switch(ap->a_op) { 2553 case MOUNTCTL_SET_EXPORT: 2554 if (ap->a_ctllen != sizeof(struct export_args)) 2555 error = EINVAL; 2556 else 2557 error = hammer_vfs_export(mp, ap->a_op, 2558 (const struct export_args *)ap->a_ctl); 2559 break; 2560 case MOUNTCTL_MOUNTFLAGS: 2561 /* 2562 * Call standard mountctl VOP function 2563 * so we get user mount flags. 2564 */ 2565 error = vop_stdmountctl(ap); 2566 if (error) 2567 break; 2568 2569 usedbytes = *ap->a_res; 2570 2571 if (usedbytes > 0 && usedbytes < ap->a_buflen) { 2572 usedbytes += vfs_flagstostr(hmp->hflags, extraopt, 2573 ap->a_buf, 2574 ap->a_buflen - usedbytes, 2575 &error); 2576 } 2577 2578 *ap->a_res += usedbytes; 2579 break; 2580 default: 2581 error = vop_stdmountctl(ap); 2582 break; 2583 } 2584 lwkt_reltoken(&hmp->fs_token); 2585 return(error); 2586 } 2587 2588 /* 2589 * hammer_vop_strategy { vp, bio } 2590 * 2591 * Strategy call, used for regular file read & write only. Note that the 2592 * bp may represent a cluster. 2593 * 2594 * To simplify operation and allow better optimizations in the future, 2595 * this code does not make any assumptions with regards to buffer alignment 2596 * or size. 2597 */ 2598 static 2599 int 2600 hammer_vop_strategy(struct vop_strategy_args *ap) 2601 { 2602 struct buf *bp; 2603 int error; 2604 2605 bp = ap->a_bio->bio_buf; 2606 2607 switch(bp->b_cmd) { 2608 case BUF_CMD_READ: 2609 error = hammer_vop_strategy_read(ap); 2610 break; 2611 case BUF_CMD_WRITE: 2612 error = hammer_vop_strategy_write(ap); 2613 break; 2614 default: 2615 bp->b_error = error = EINVAL; 2616 bp->b_flags |= B_ERROR; 2617 biodone(ap->a_bio); 2618 break; 2619 } 2620 return (error); 2621 } 2622 2623 /* 2624 * Read from a regular file. Iterate the related records and fill in the 2625 * BIO/BUF. Gaps are zero-filled. 2626 * 2627 * The support code in hammer_object.c should be used to deal with mixed 2628 * in-memory and on-disk records. 2629 * 2630 * NOTE: Can be called from the cluster code with an oversized buf. 2631 * 2632 * XXX atime update 2633 */ 2634 static 2635 int 2636 hammer_vop_strategy_read(struct vop_strategy_args *ap) 2637 { 2638 struct hammer_transaction trans; 2639 hammer_inode_t ip; 2640 hammer_inode_t dip; 2641 hammer_mount_t hmp; 2642 struct hammer_cursor cursor; 2643 hammer_base_elm_t base; 2644 hammer_off_t disk_offset; 2645 struct bio *bio; 2646 struct bio *nbio; 2647 struct buf *bp; 2648 int64_t rec_offset; 2649 int64_t ran_end; 2650 int64_t tmp64; 2651 int error; 2652 int boff; 2653 int roff; 2654 int n; 2655 int isdedupable; 2656 2657 bio = ap->a_bio; 2658 bp = bio->bio_buf; 2659 ip = ap->a_vp->v_data; 2660 hmp = ip->hmp; 2661 2662 /* 2663 * The zone-2 disk offset may have been set by the cluster code via 2664 * a BMAP operation, or else should be NOOFFSET. 2665 * 2666 * Checking the high bits for a match against zone-2 should suffice. 2667 * 2668 * In cases where a lot of data duplication is present it may be 2669 * more beneficial to drop through and doubule-buffer through the 2670 * device. 2671 */ 2672 nbio = push_bio(bio); 2673 if (hammer_is_zone_large_data(nbio->bio_offset)) { 2674 if (hammer_double_buffer == 0) { 2675 lwkt_gettoken(&hmp->fs_token); 2676 error = hammer_io_direct_read(hmp, nbio, NULL); 2677 lwkt_reltoken(&hmp->fs_token); 2678 return (error); 2679 } 2680 2681 /* 2682 * Try to shortcut requests for double_buffer mode too. 2683 * Since this mode runs through the device buffer cache 2684 * only compatible buffer sizes (meaning those generated 2685 * by normal filesystem buffers) are legal. 2686 */ 2687 if ((bp->b_flags & B_PAGING) == 0) { 2688 lwkt_gettoken(&hmp->fs_token); 2689 error = hammer_io_indirect_read(hmp, nbio, NULL); 2690 lwkt_reltoken(&hmp->fs_token); 2691 return (error); 2692 } 2693 } 2694 2695 /* 2696 * Well, that sucked. Do it the hard way. If all the stars are 2697 * aligned we may still be able to issue a direct-read. 2698 */ 2699 lwkt_gettoken(&hmp->fs_token); 2700 hammer_simple_transaction(&trans, hmp); 2701 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 2702 2703 /* 2704 * Key range (begin and end inclusive) to scan. Note that the key's 2705 * stored in the actual records represent BASE+LEN, not BASE. The 2706 * first record containing bio_offset will have a key > bio_offset. 2707 */ 2708 cursor.key_beg.localization = ip->obj_localization | 2709 HAMMER_LOCALIZE_MISC; 2710 cursor.key_beg.obj_id = ip->obj_id; 2711 cursor.key_beg.create_tid = 0; 2712 cursor.key_beg.delete_tid = 0; 2713 cursor.key_beg.obj_type = 0; 2714 cursor.key_beg.key = bio->bio_offset + 1; 2715 cursor.asof = ip->obj_asof; 2716 cursor.flags |= HAMMER_CURSOR_ASOF; 2717 2718 cursor.key_end = cursor.key_beg; 2719 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE); 2720 #if 0 2721 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) { 2722 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB; 2723 cursor.key_end.rec_type = HAMMER_RECTYPE_DB; 2724 cursor.key_end.key = HAMMER_MAX_KEY; 2725 } else 2726 #endif 2727 { 2728 ran_end = bio->bio_offset + bp->b_bufsize; 2729 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA; 2730 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA; 2731 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */ 2732 if (tmp64 < ran_end) 2733 cursor.key_end.key = HAMMER_MAX_KEY; 2734 else 2735 cursor.key_end.key = ran_end + MAXPHYS + 1; 2736 } 2737 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE; 2738 2739 /* 2740 * Set NOSWAPCACHE for cursor data extraction if double buffering 2741 * is disabled or (if the file is not marked cacheable via chflags 2742 * and vm.swapcache_use_chflags is enabled). 2743 */ 2744 if (hammer_double_buffer == 0 || 2745 ((ap->a_vp->v_flag & VSWAPCACHE) == 0 && 2746 vm_swapcache_use_chflags)) { 2747 cursor.flags |= HAMMER_CURSOR_NOSWAPCACHE; 2748 } 2749 2750 error = hammer_ip_first(&cursor); 2751 boff = 0; 2752 2753 while (error == 0) { 2754 /* 2755 * Get the base file offset of the record. The key for 2756 * data records is (base + bytes) rather then (base). 2757 */ 2758 base = &cursor.leaf->base; 2759 rec_offset = base->key - cursor.leaf->data_len; 2760 2761 /* 2762 * Calculate the gap, if any, and zero-fill it. 2763 * 2764 * n is the offset of the start of the record verses our 2765 * current seek offset in the bio. 2766 */ 2767 n = (int)(rec_offset - (bio->bio_offset + boff)); 2768 if (n > 0) { 2769 if (n > bp->b_bufsize - boff) 2770 n = bp->b_bufsize - boff; 2771 bzero((char *)bp->b_data + boff, n); 2772 boff += n; 2773 n = 0; 2774 } 2775 2776 /* 2777 * Calculate the data offset in the record and the number 2778 * of bytes we can copy. 2779 * 2780 * There are two degenerate cases. First, boff may already 2781 * be at bp->b_bufsize. Secondly, the data offset within 2782 * the record may exceed the record's size. 2783 */ 2784 roff = -n; 2785 rec_offset += roff; 2786 n = cursor.leaf->data_len - roff; 2787 if (n <= 0) { 2788 hdkprintf("bad n=%d roff=%d\n", n, roff); 2789 n = 0; 2790 } else if (n > bp->b_bufsize - boff) { 2791 n = bp->b_bufsize - boff; 2792 } 2793 2794 /* 2795 * Deal with cached truncations. This cool bit of code 2796 * allows truncate()/ftruncate() to avoid having to sync 2797 * the file. 2798 * 2799 * If the frontend is truncated then all backend records are 2800 * subject to the frontend's truncation. 2801 * 2802 * If the backend is truncated then backend records on-disk 2803 * (but not in-memory) are subject to the backend's 2804 * truncation. In-memory records owned by the backend 2805 * represent data written after the truncation point on the 2806 * backend and must not be truncated. 2807 * 2808 * Truncate operations deal with frontend buffer cache 2809 * buffers and frontend-owned in-memory records synchronously. 2810 */ 2811 if (ip->flags & HAMMER_INODE_TRUNCATED) { 2812 if (hammer_cursor_ondisk(&cursor)/* || 2813 cursor.iprec->flush_state == HAMMER_FST_FLUSH*/) { 2814 if (ip->trunc_off <= rec_offset) 2815 n = 0; 2816 else if (ip->trunc_off < rec_offset + n) 2817 n = (int)(ip->trunc_off - rec_offset); 2818 } 2819 } 2820 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 2821 if (hammer_cursor_ondisk(&cursor)) { 2822 if (ip->sync_trunc_off <= rec_offset) 2823 n = 0; 2824 else if (ip->sync_trunc_off < rec_offset + n) 2825 n = (int)(ip->sync_trunc_off - rec_offset); 2826 } 2827 } 2828 2829 /* 2830 * Try to issue a direct read into our bio if possible, 2831 * otherwise resolve the element data into a hammer_buffer 2832 * and copy. 2833 * 2834 * The buffer on-disk should be zerod past any real 2835 * truncation point, but may not be for any synthesized 2836 * truncation point from above. 2837 * 2838 * NOTE: disk_offset is only valid if the cursor data is 2839 * on-disk. 2840 */ 2841 disk_offset = cursor.leaf->data_offset + roff; 2842 isdedupable = (boff == 0 && n == bp->b_bufsize && 2843 hammer_cursor_ondisk(&cursor) && 2844 ((int)disk_offset & HAMMER_BUFMASK) == 0); 2845 2846 if (isdedupable && hammer_double_buffer == 0) { 2847 /* 2848 * Direct read case 2849 */ 2850 KKASSERT(hammer_is_zone_large_data(disk_offset)); 2851 nbio->bio_offset = disk_offset; 2852 error = hammer_io_direct_read(hmp, nbio, cursor.leaf); 2853 goto done; 2854 } else if (isdedupable) { 2855 /* 2856 * Async I/O case for reading from backing store 2857 * and copying the data to the filesystem buffer. 2858 */ 2859 KKASSERT(hammer_is_zone_large_data(disk_offset)); 2860 nbio->bio_offset = disk_offset; 2861 error = hammer_io_indirect_read(hmp, nbio, cursor.leaf); 2862 goto done; 2863 } else if (n) { 2864 error = hammer_ip_resolve_data(&cursor); 2865 if (error == 0) { 2866 bcopy((char *)cursor.data + roff, 2867 (char *)bp->b_data + boff, n); 2868 } 2869 } 2870 if (error) 2871 break; 2872 2873 /* 2874 * Iterate until we have filled the request. 2875 */ 2876 boff += n; 2877 if (boff == bp->b_bufsize) 2878 break; 2879 error = hammer_ip_next(&cursor); 2880 } 2881 2882 /* 2883 * There may have been a gap after the last record 2884 */ 2885 if (error == ENOENT) 2886 error = 0; 2887 if (error == 0 && boff != bp->b_bufsize) { 2888 KKASSERT(boff < bp->b_bufsize); 2889 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff); 2890 /* boff = bp->b_bufsize; */ 2891 } 2892 2893 /* 2894 * Disallow swapcache operation on the vnode buffer if double 2895 * buffering is enabled, the swapcache will get the data via 2896 * the block device buffer. 2897 */ 2898 if (hammer_double_buffer) 2899 bp->b_flags |= B_NOTMETA; 2900 2901 /* 2902 * Cleanup 2903 */ 2904 bp->b_resid = 0; 2905 bp->b_error = error; 2906 if (error) 2907 bp->b_flags |= B_ERROR; 2908 biodone(ap->a_bio); 2909 2910 done: 2911 /* 2912 * Cache the b-tree node for the last data read in cache[1]. 2913 * 2914 * If we hit the file EOF then also cache the node in the 2915 * governing directory's cache[3], it will be used to initialize 2916 * the new inode's cache[1] for any inodes looked up via the directory. 2917 * 2918 * This doesn't reduce disk accesses since the B-Tree chain is 2919 * likely cached, but it does reduce cpu overhead when looking 2920 * up file offsets for cpdup/tar/cpio style iterations. 2921 */ 2922 if (cursor.node) 2923 hammer_cache_node(&ip->cache[1], cursor.node); 2924 if (ran_end >= ip->ino_data.size) { 2925 dip = hammer_find_inode(&trans, ip->ino_data.parent_obj_id, 2926 ip->obj_asof, ip->obj_localization); 2927 if (dip) { 2928 hammer_cache_node(&dip->cache[3], cursor.node); 2929 hammer_rel_inode(dip, 0); 2930 } 2931 } 2932 hammer_done_cursor(&cursor); 2933 hammer_done_transaction(&trans); 2934 lwkt_reltoken(&hmp->fs_token); 2935 return(error); 2936 } 2937 2938 /* 2939 * BMAP operation - used to support cluster_read() only. 2940 * 2941 * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb) 2942 * 2943 * This routine may return EOPNOTSUPP if the opration is not supported for 2944 * the specified offset. The contents of the pointer arguments do not 2945 * need to be initialized in that case. 2946 * 2947 * If a disk address is available and properly aligned return 0 with 2948 * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately 2949 * to the run-length relative to that offset. Callers may assume that 2950 * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently 2951 * large, so return EOPNOTSUPP if it is not sufficiently large. 2952 */ 2953 static 2954 int 2955 hammer_vop_bmap(struct vop_bmap_args *ap) 2956 { 2957 struct hammer_transaction trans; 2958 hammer_inode_t ip; 2959 hammer_mount_t hmp; 2960 struct hammer_cursor cursor; 2961 hammer_base_elm_t base; 2962 int64_t rec_offset; 2963 int64_t ran_end; 2964 int64_t tmp64; 2965 int64_t base_offset; 2966 int64_t base_disk_offset; 2967 int64_t last_offset; 2968 hammer_off_t last_disk_offset; 2969 hammer_off_t disk_offset; 2970 int rec_len; 2971 int error; 2972 int blksize; 2973 2974 ip = ap->a_vp->v_data; 2975 hmp = ip->hmp; 2976 2977 /* 2978 * We can only BMAP regular files. We can't BMAP database files, 2979 * directories, etc. 2980 */ 2981 if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE) 2982 return(EOPNOTSUPP); 2983 2984 /* 2985 * bmap is typically called with runp/runb both NULL when used 2986 * for writing. We do not support BMAP for writing atm. 2987 */ 2988 if (ap->a_cmd != BUF_CMD_READ) 2989 return(EOPNOTSUPP); 2990 2991 /* 2992 * Scan the B-Tree to acquire blockmap addresses, then translate 2993 * to raw addresses. 2994 */ 2995 lwkt_gettoken(&hmp->fs_token); 2996 hammer_simple_transaction(&trans, hmp); 2997 2998 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 2999 3000 /* 3001 * Key range (begin and end inclusive) to scan. Note that the key's 3002 * stored in the actual records represent BASE+LEN, not BASE. The 3003 * first record containing bio_offset will have a key > bio_offset. 3004 */ 3005 cursor.key_beg.localization = ip->obj_localization | 3006 HAMMER_LOCALIZE_MISC; 3007 cursor.key_beg.obj_id = ip->obj_id; 3008 cursor.key_beg.create_tid = 0; 3009 cursor.key_beg.delete_tid = 0; 3010 cursor.key_beg.obj_type = 0; 3011 if (ap->a_runb) 3012 cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1; 3013 else 3014 cursor.key_beg.key = ap->a_loffset + 1; 3015 if (cursor.key_beg.key < 0) 3016 cursor.key_beg.key = 0; 3017 cursor.asof = ip->obj_asof; 3018 cursor.flags |= HAMMER_CURSOR_ASOF; 3019 3020 cursor.key_end = cursor.key_beg; 3021 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE); 3022 3023 ran_end = ap->a_loffset + MAXPHYS; 3024 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA; 3025 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA; 3026 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */ 3027 if (tmp64 < ran_end) 3028 cursor.key_end.key = HAMMER_MAX_KEY; 3029 else 3030 cursor.key_end.key = ran_end + MAXPHYS + 1; 3031 3032 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE; 3033 3034 error = hammer_ip_first(&cursor); 3035 base_offset = last_offset = 0; 3036 base_disk_offset = last_disk_offset = 0; 3037 3038 while (error == 0) { 3039 /* 3040 * Get the base file offset of the record. The key for 3041 * data records is (base + bytes) rather then (base). 3042 * 3043 * NOTE: rec_offset + rec_len may exceed the end-of-file. 3044 * The extra bytes should be zero on-disk and the BMAP op 3045 * should still be ok. 3046 */ 3047 base = &cursor.leaf->base; 3048 rec_offset = base->key - cursor.leaf->data_len; 3049 rec_len = cursor.leaf->data_len; 3050 3051 /* 3052 * Incorporate any cached truncation. 3053 * 3054 * NOTE: Modifications to rec_len based on synthesized 3055 * truncation points remove the guarantee that any extended 3056 * data on disk is zero (since the truncations may not have 3057 * taken place on-media yet). 3058 */ 3059 if (ip->flags & HAMMER_INODE_TRUNCATED) { 3060 if (hammer_cursor_ondisk(&cursor) || 3061 cursor.iprec->flush_state == HAMMER_FST_FLUSH) { 3062 if (ip->trunc_off <= rec_offset) 3063 rec_len = 0; 3064 else if (ip->trunc_off < rec_offset + rec_len) 3065 rec_len = (int)(ip->trunc_off - rec_offset); 3066 } 3067 } 3068 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 3069 if (hammer_cursor_ondisk(&cursor)) { 3070 if (ip->sync_trunc_off <= rec_offset) 3071 rec_len = 0; 3072 else if (ip->sync_trunc_off < rec_offset + rec_len) 3073 rec_len = (int)(ip->sync_trunc_off - rec_offset); 3074 } 3075 } 3076 3077 /* 3078 * Accumulate information. If we have hit a discontiguous 3079 * block reset base_offset unless we are already beyond the 3080 * requested offset. If we are, that's it, we stop. 3081 */ 3082 if (error) 3083 break; 3084 if (hammer_cursor_ondisk(&cursor)) { 3085 disk_offset = cursor.leaf->data_offset; 3086 if (rec_offset != last_offset || 3087 disk_offset != last_disk_offset) { 3088 if (rec_offset > ap->a_loffset) 3089 break; 3090 base_offset = rec_offset; 3091 base_disk_offset = disk_offset; 3092 } 3093 last_offset = rec_offset + rec_len; 3094 last_disk_offset = disk_offset + rec_len; 3095 } 3096 error = hammer_ip_next(&cursor); 3097 } 3098 3099 if (cursor.node) 3100 hammer_cache_node(&ip->cache[1], cursor.node); 3101 3102 hammer_done_cursor(&cursor); 3103 hammer_done_transaction(&trans); 3104 lwkt_reltoken(&hmp->fs_token); 3105 3106 /* 3107 * If we couldn't find any records or the records we did find were 3108 * all behind the requested offset, return failure. A forward 3109 * truncation can leave a hole w/ no on-disk records. 3110 */ 3111 if (last_offset == 0 || last_offset < ap->a_loffset) 3112 return (EOPNOTSUPP); 3113 3114 /* 3115 * Figure out the block size at the requested offset and adjust 3116 * our limits so the cluster_read() does not create inappropriately 3117 * sized buffer cache buffers. 3118 */ 3119 blksize = hammer_blocksize(ap->a_loffset); 3120 if (hammer_blocksize(base_offset) != blksize) { 3121 base_offset = hammer_blockdemarc(base_offset, ap->a_loffset); 3122 } 3123 if (last_offset != ap->a_loffset && 3124 hammer_blocksize(last_offset - 1) != blksize) { 3125 last_offset = hammer_blockdemarc(ap->a_loffset, 3126 last_offset - 1); 3127 } 3128 3129 /* 3130 * Returning EOPNOTSUPP simply prevents the direct-IO optimization 3131 * from occuring. 3132 */ 3133 disk_offset = base_disk_offset + (ap->a_loffset - base_offset); 3134 3135 if (!hammer_is_zone_large_data(disk_offset)) { 3136 /* 3137 * Only large-data zones can be direct-IOd 3138 */ 3139 error = EOPNOTSUPP; 3140 } else if ((disk_offset & HAMMER_BUFMASK) || 3141 (last_offset - ap->a_loffset) < blksize) { 3142 /* 3143 * doffsetp is not aligned or the forward run size does 3144 * not cover a whole buffer, disallow the direct I/O. 3145 */ 3146 error = EOPNOTSUPP; 3147 } else { 3148 /* 3149 * We're good. 3150 */ 3151 *ap->a_doffsetp = disk_offset; 3152 if (ap->a_runb) { 3153 *ap->a_runb = ap->a_loffset - base_offset; 3154 KKASSERT(*ap->a_runb >= 0); 3155 } 3156 if (ap->a_runp) { 3157 *ap->a_runp = last_offset - ap->a_loffset; 3158 KKASSERT(*ap->a_runp >= 0); 3159 } 3160 error = 0; 3161 } 3162 return(error); 3163 } 3164 3165 /* 3166 * Write to a regular file. Because this is a strategy call the OS is 3167 * trying to actually get data onto the media. 3168 */ 3169 static 3170 int 3171 hammer_vop_strategy_write(struct vop_strategy_args *ap) 3172 { 3173 hammer_record_t record; 3174 hammer_mount_t hmp; 3175 hammer_inode_t ip; 3176 struct bio *bio; 3177 struct buf *bp; 3178 int blksize __debugvar; 3179 int bytes; 3180 int error; 3181 3182 bio = ap->a_bio; 3183 bp = bio->bio_buf; 3184 ip = ap->a_vp->v_data; 3185 hmp = ip->hmp; 3186 3187 blksize = hammer_blocksize(bio->bio_offset); 3188 KKASSERT(bp->b_bufsize == blksize); 3189 3190 if (ip->flags & HAMMER_INODE_RO) { 3191 bp->b_error = EROFS; 3192 bp->b_flags |= B_ERROR; 3193 biodone(ap->a_bio); 3194 return(EROFS); 3195 } 3196 3197 lwkt_gettoken(&hmp->fs_token); 3198 3199 /* 3200 * Disallow swapcache operation on the vnode buffer if double 3201 * buffering is enabled, the swapcache will get the data via 3202 * the block device buffer. 3203 */ 3204 if (hammer_double_buffer) 3205 bp->b_flags |= B_NOTMETA; 3206 3207 /* 3208 * Interlock with inode destruction (no in-kernel or directory 3209 * topology visibility). If we queue new IO while trying to 3210 * destroy the inode we can deadlock the vtrunc call in 3211 * hammer_inode_unloadable_check(). 3212 * 3213 * Besides, there's no point flushing a bp associated with an 3214 * inode that is being destroyed on-media and has no kernel 3215 * references. 3216 */ 3217 if ((ip->flags | ip->sync_flags) & 3218 (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) { 3219 bp->b_resid = 0; 3220 biodone(ap->a_bio); 3221 lwkt_reltoken(&hmp->fs_token); 3222 return(0); 3223 } 3224 3225 /* 3226 * Reserve space and issue a direct-write from the front-end. 3227 * NOTE: The direct_io code will hammer_bread/bcopy smaller 3228 * allocations. 3229 * 3230 * An in-memory record will be installed to reference the storage 3231 * until the flusher can get to it. 3232 * 3233 * Since we own the high level bio the front-end will not try to 3234 * do a direct-read until the write completes. 3235 * 3236 * NOTE: The only time we do not reserve a full-sized buffers 3237 * worth of data is if the file is small. We do not try to 3238 * allocate a fragment (from the small-data zone) at the end of 3239 * an otherwise large file as this can lead to wildly separated 3240 * data. 3241 */ 3242 KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0); 3243 KKASSERT(bio->bio_offset < ip->ino_data.size); 3244 if (bio->bio_offset || ip->ino_data.size > HAMMER_HBUFSIZE) 3245 bytes = bp->b_bufsize; 3246 else 3247 bytes = HAMMER_DATA_DOALIGN_WITH(int, ip->ino_data.size); 3248 3249 record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data, 3250 bytes, &error); 3251 3252 /* 3253 * B_VFSFLAG1 indicates that a REDO_WRITE entry was generated 3254 * in hammer_vop_write(). We must flag the record so the proper 3255 * REDO_TERM_WRITE entry is generated during the flush. 3256 */ 3257 if (record) { 3258 if (bp->b_flags & B_VFSFLAG1) { 3259 record->flags |= HAMMER_RECF_REDO; 3260 bp->b_flags &= ~B_VFSFLAG1; 3261 } 3262 hammer_io_direct_write(hmp, bio, record); 3263 if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs) 3264 hammer_flush_inode(ip, 0); 3265 } else { 3266 bp->b_bio2.bio_offset = NOOFFSET; 3267 bp->b_error = error; 3268 bp->b_flags |= B_ERROR; 3269 biodone(ap->a_bio); 3270 } 3271 lwkt_reltoken(&hmp->fs_token); 3272 return(error); 3273 } 3274 3275 /* 3276 * dounlink - disconnect a directory entry 3277 * 3278 * XXX whiteout support not really in yet 3279 */ 3280 static int 3281 hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch, 3282 struct vnode *dvp, struct ucred *cred, 3283 int flags, int isdir) 3284 { 3285 struct namecache *ncp; 3286 hammer_inode_t dip; 3287 hammer_inode_t ip; 3288 hammer_mount_t hmp; 3289 struct hammer_cursor cursor; 3290 int64_t namekey; 3291 uint32_t max_iterations; 3292 int nlen, error; 3293 3294 /* 3295 * Calculate the namekey and setup the key range for the scan. This 3296 * works kinda like a chained hash table where the lower 32 bits 3297 * of the namekey synthesize the chain. 3298 * 3299 * The key range is inclusive of both key_beg and key_end. 3300 */ 3301 dip = VTOI(dvp); 3302 ncp = nch->ncp; 3303 hmp = dip->hmp; 3304 3305 if (dip->flags & HAMMER_INODE_RO) 3306 return (EROFS); 3307 3308 namekey = hammer_direntry_namekey(dip, ncp->nc_name, ncp->nc_nlen, 3309 &max_iterations); 3310 retry: 3311 hammer_init_cursor(trans, &cursor, &dip->cache[1], dip); 3312 cursor.key_beg.localization = dip->obj_localization | 3313 hammer_dir_localization(dip); 3314 cursor.key_beg.obj_id = dip->obj_id; 3315 cursor.key_beg.key = namekey; 3316 cursor.key_beg.create_tid = 0; 3317 cursor.key_beg.delete_tid = 0; 3318 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 3319 cursor.key_beg.obj_type = 0; 3320 3321 cursor.key_end = cursor.key_beg; 3322 cursor.key_end.key += max_iterations; 3323 cursor.asof = dip->obj_asof; 3324 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 3325 3326 /* 3327 * Scan all matching records (the chain), locate the one matching 3328 * the requested path component. info->last_error contains the 3329 * error code on search termination and could be 0, ENOENT, or 3330 * something else. 3331 * 3332 * The hammer_ip_*() functions merge in-memory records with on-disk 3333 * records for the purposes of the search. 3334 */ 3335 error = hammer_ip_first(&cursor); 3336 3337 while (error == 0) { 3338 error = hammer_ip_resolve_data(&cursor); 3339 if (error) 3340 break; 3341 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF; 3342 KKASSERT(nlen > 0); 3343 if (ncp->nc_nlen == nlen && 3344 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) { 3345 break; 3346 } 3347 error = hammer_ip_next(&cursor); 3348 } 3349 3350 /* 3351 * If all is ok we have to get the inode so we can adjust nlinks. 3352 * To avoid a deadlock with the flusher we must release the inode 3353 * lock on the directory when acquiring the inode for the entry. 3354 * 3355 * If the target is a directory, it must be empty. 3356 */ 3357 if (error == 0) { 3358 hammer_unlock(&cursor.ip->lock); 3359 ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id, 3360 hmp->asof, 3361 cursor.data->entry.localization, 3362 0, &error); 3363 hammer_lock_sh(&cursor.ip->lock); 3364 if (error == ENOENT) { 3365 hkprintf("WARNING: Removing dirent w/missing inode " 3366 "\"%s\"\n" 3367 "\tobj_id = %016jx\n", 3368 ncp->nc_name, 3369 (intmax_t)cursor.data->entry.obj_id); 3370 error = 0; 3371 } 3372 3373 /* 3374 * If isdir >= 0 we validate that the entry is or is not a 3375 * directory. If isdir < 0 we don't care. 3376 */ 3377 if (error == 0 && isdir >= 0 && ip) { 3378 if (isdir && 3379 ip->ino_data.obj_type != HAMMER_OBJTYPE_DIRECTORY) { 3380 error = ENOTDIR; 3381 } else if (isdir == 0 && 3382 ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY) { 3383 error = EISDIR; 3384 } 3385 } 3386 3387 /* 3388 * If we are trying to remove a directory the directory must 3389 * be empty. 3390 * 3391 * The check directory code can loop and deadlock/retry. Our 3392 * own cursor's node locks must be released to avoid a 3-way 3393 * deadlock with the flusher if the check directory code 3394 * blocks. 3395 * 3396 * If any changes whatsoever have been made to the cursor 3397 * set EDEADLK and retry. 3398 * 3399 * WARNING: See warnings in hammer_unlock_cursor() 3400 * function. 3401 */ 3402 if (error == 0 && ip && ip->ino_data.obj_type == 3403 HAMMER_OBJTYPE_DIRECTORY) { 3404 hammer_unlock_cursor(&cursor); 3405 error = hammer_ip_check_directory_empty(trans, ip); 3406 hammer_lock_cursor(&cursor); 3407 if (cursor.flags & HAMMER_CURSOR_RETEST) { 3408 hkprintf("Warning: avoided deadlock " 3409 "on rmdir '%s'\n", 3410 ncp->nc_name); 3411 error = EDEADLK; 3412 } 3413 } 3414 3415 /* 3416 * Delete the directory entry. 3417 * 3418 * WARNING: hammer_ip_del_direntry() may have to terminate 3419 * the cursor to avoid a deadlock. It is ok to call 3420 * hammer_done_cursor() twice. 3421 */ 3422 if (error == 0) { 3423 error = hammer_ip_del_direntry(trans, &cursor, 3424 dip, ip); 3425 } 3426 hammer_done_cursor(&cursor); 3427 if (error == 0) { 3428 /* 3429 * Tell the namecache that we are now unlinked. 3430 */ 3431 cache_unlink(nch); 3432 3433 /* 3434 * NOTE: ip->vp, if non-NULL, cannot be directly 3435 * referenced without formally acquiring the 3436 * vp since the vp might have zero refs on it, 3437 * or in the middle of a reclaim, etc. 3438 * 3439 * NOTE: The cache_setunresolved() can rip the vp 3440 * out from under us since the vp may not have 3441 * any refs, in which case ip->vp will be NULL 3442 * from the outset. 3443 */ 3444 while (ip && ip->vp) { 3445 struct vnode *vp; 3446 3447 error = hammer_get_vnode(ip, &vp); 3448 if (error == 0 && vp) { 3449 vn_unlock(vp); 3450 hammer_knote(ip->vp, NOTE_DELETE); 3451 #if 0 3452 /* 3453 * Don't do this, it can deadlock 3454 * on concurrent rm's of hardlinks. 3455 * Shouldn't be needed any more. 3456 */ 3457 cache_inval_vp(ip->vp, CINV_DESTROY); 3458 #endif 3459 vrele(vp); 3460 break; 3461 } 3462 hdkprintf("ip/vp race1 avoided\n"); 3463 } 3464 } 3465 if (ip) 3466 hammer_rel_inode(ip, 0); 3467 } else { 3468 hammer_done_cursor(&cursor); 3469 } 3470 if (error == EDEADLK) 3471 goto retry; 3472 3473 return (error); 3474 } 3475 3476 /************************************************************************ 3477 * FIFO AND SPECFS OPS * 3478 ************************************************************************ 3479 * 3480 */ 3481 static int 3482 hammer_vop_fifoclose (struct vop_close_args *ap) 3483 { 3484 /* XXX update itimes */ 3485 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3486 } 3487 3488 static int 3489 hammer_vop_fiforead (struct vop_read_args *ap) 3490 { 3491 int error; 3492 3493 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 3494 /* XXX update access time */ 3495 return (error); 3496 } 3497 3498 static int 3499 hammer_vop_fifowrite (struct vop_write_args *ap) 3500 { 3501 int error; 3502 3503 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 3504 /* XXX update access time */ 3505 return (error); 3506 } 3507 3508 static 3509 int 3510 hammer_vop_fifokqfilter(struct vop_kqfilter_args *ap) 3511 { 3512 int error; 3513 3514 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 3515 if (error) 3516 error = hammer_vop_kqfilter(ap); 3517 return(error); 3518 } 3519 3520 /************************************************************************ 3521 * KQFILTER OPS * 3522 ************************************************************************ 3523 * 3524 */ 3525 static void filt_hammerdetach(struct knote *kn); 3526 static int filt_hammerread(struct knote *kn, long hint); 3527 static int filt_hammerwrite(struct knote *kn, long hint); 3528 static int filt_hammervnode(struct knote *kn, long hint); 3529 3530 static struct filterops hammerread_filtops = 3531 { FILTEROP_ISFD | FILTEROP_MPSAFE, 3532 NULL, filt_hammerdetach, filt_hammerread }; 3533 static struct filterops hammerwrite_filtops = 3534 { FILTEROP_ISFD | FILTEROP_MPSAFE, 3535 NULL, filt_hammerdetach, filt_hammerwrite }; 3536 static struct filterops hammervnode_filtops = 3537 { FILTEROP_ISFD | FILTEROP_MPSAFE, 3538 NULL, filt_hammerdetach, filt_hammervnode }; 3539 3540 static 3541 int 3542 hammer_vop_kqfilter(struct vop_kqfilter_args *ap) 3543 { 3544 struct vnode *vp = ap->a_vp; 3545 struct knote *kn = ap->a_kn; 3546 3547 switch (kn->kn_filter) { 3548 case EVFILT_READ: 3549 kn->kn_fop = &hammerread_filtops; 3550 break; 3551 case EVFILT_WRITE: 3552 kn->kn_fop = &hammerwrite_filtops; 3553 break; 3554 case EVFILT_VNODE: 3555 kn->kn_fop = &hammervnode_filtops; 3556 break; 3557 default: 3558 return (EOPNOTSUPP); 3559 } 3560 3561 kn->kn_hook = (caddr_t)vp; 3562 3563 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 3564 3565 return(0); 3566 } 3567 3568 static void 3569 filt_hammerdetach(struct knote *kn) 3570 { 3571 struct vnode *vp = (void *)kn->kn_hook; 3572 3573 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 3574 } 3575 3576 static int 3577 filt_hammerread(struct knote *kn, long hint) 3578 { 3579 struct vnode *vp = (void *)kn->kn_hook; 3580 hammer_inode_t ip = VTOI(vp); 3581 hammer_mount_t hmp = ip->hmp; 3582 off_t off; 3583 3584 if (hint == NOTE_REVOKE) { 3585 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 3586 return(1); 3587 } 3588 lwkt_gettoken(&hmp->fs_token); /* XXX use per-ip-token */ 3589 off = ip->ino_data.size - kn->kn_fp->f_offset; 3590 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 3591 lwkt_reltoken(&hmp->fs_token); 3592 if (kn->kn_sfflags & NOTE_OLDAPI) 3593 return(1); 3594 return (kn->kn_data != 0); 3595 } 3596 3597 static int 3598 filt_hammerwrite(struct knote *kn, long hint) 3599 { 3600 if (hint == NOTE_REVOKE) 3601 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 3602 kn->kn_data = 0; 3603 return (1); 3604 } 3605 3606 static int 3607 filt_hammervnode(struct knote *kn, long hint) 3608 { 3609 if (kn->kn_sfflags & hint) 3610 kn->kn_fflags |= hint; 3611 if (hint == NOTE_REVOKE) { 3612 kn->kn_flags |= (EV_EOF | EV_NODATA); 3613 return (1); 3614 } 3615 return (kn->kn_fflags != 0); 3616 } 3617 3618