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 vx_unlock(ap->a_vp); 282 dorelock = 1; 283 } else { 284 dorelock = 0; 285 } 286 hammer_wait_inode(ip); 287 if (dorelock) 288 vx_lock(ap->a_vp); 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 = (uio->uio_resid + (BKVASIZE - 1)) / BKVASIZE; 345 ioseqcount = (ap->a_ioflag >> 16); 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, uio->uio_resid, 416 seqcount * BKVASIZE, &bp); 417 } else { 418 error = breadnx(ap->a_vp, base_offset, blksize, 419 NULL, NULL, 0, &bp); 420 } 421 if (error) { 422 brelse(bp); 423 break; 424 } 425 skip: 426 if ((hammer_debug_io & 0x0001) && (bp->b_flags & B_IODEBUG)) { 427 hdkprintf("zone2_offset %016jx read file %016jx@%016jx\n", 428 (intmax_t)bp->b_bio2.bio_offset, 429 (intmax_t)ip->obj_id, 430 (intmax_t)bp->b_loffset); 431 } 432 bp->b_flags &= ~B_IODEBUG; 433 if (blksize == HAMMER_XBUFSIZE) 434 bp->b_flags |= B_CLUSTEROK; 435 436 n = blksize - offset; 437 if (n > uio->uio_resid) 438 n = uio->uio_resid; 439 if (n > ip->ino_data.size - uio->uio_offset) 440 n = (int)(ip->ino_data.size - uio->uio_offset); 441 442 /* 443 * Set B_AGE, data has a lower priority than meta-data. 444 * 445 * Use a hold/unlock/drop sequence to run the uiomove 446 * with the buffer unlocked, avoiding deadlocks against 447 * read()s on mmap()'d spaces. 448 */ 449 bp->b_flags |= B_AGE; 450 error = uiomovebp(bp, (char *)bp->b_data + offset, n, uio); 451 bqrelse(bp); 452 453 if (error) 454 break; 455 hammer_stats_file_read += n; 456 } 457 458 finished: 459 460 /* 461 * Try to update the atime with just the inode lock for maximum 462 * concurrency. If we can't shortcut it we have to get the full 463 * blown transaction. 464 */ 465 if (got_trans == 0 && hammer_update_atime_quick(ip) < 0) { 466 hammer_start_transaction(&trans, ip->hmp); 467 got_trans = 1; 468 } 469 470 if (got_trans) { 471 if ((ip->flags & HAMMER_INODE_RO) == 0 && 472 (ip->hmp->mp->mnt_flag & MNT_NOATIME) == 0) { 473 lwkt_gettoken(&hmp->fs_token); 474 ip->ino_data.atime = trans.time; 475 hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME); 476 hammer_done_transaction(&trans); 477 lwkt_reltoken(&hmp->fs_token); 478 } else { 479 hammer_done_transaction(&trans); 480 } 481 } 482 return (error); 483 } 484 485 /* 486 * hammer_vop_write { vp, uio, ioflag, cred } 487 */ 488 static 489 int 490 hammer_vop_write(struct vop_write_args *ap) 491 { 492 struct hammer_transaction trans; 493 struct hammer_inode *ip; 494 hammer_mount_t hmp; 495 thread_t td; 496 struct uio *uio; 497 int offset; 498 off_t base_offset; 499 int64_t cluster_eof; 500 struct buf *bp; 501 int kflags; 502 int error; 503 int n; 504 int flags; 505 int seqcount; 506 int bigwrite; 507 508 if (ap->a_vp->v_type != VREG) 509 return (EINVAL); 510 ip = VTOI(ap->a_vp); 511 hmp = ip->hmp; 512 error = 0; 513 kflags = 0; 514 seqcount = ap->a_ioflag >> 16; 515 516 if (ip->flags & HAMMER_INODE_RO) 517 return (EROFS); 518 519 /* 520 * Create a transaction to cover the operations we perform. 521 */ 522 hammer_start_transaction(&trans, hmp); 523 uio = ap->a_uio; 524 525 /* 526 * Check append mode 527 */ 528 if (ap->a_ioflag & IO_APPEND) 529 uio->uio_offset = ip->ino_data.size; 530 531 /* 532 * Check for illegal write offsets. Valid range is 0...2^63-1. 533 * 534 * NOTE: the base_off assignment is required to work around what 535 * I consider to be a GCC-4 optimization bug. 536 */ 537 if (uio->uio_offset < 0) { 538 hammer_done_transaction(&trans); 539 return (EFBIG); 540 } 541 base_offset = uio->uio_offset + uio->uio_resid; /* work around gcc-4 */ 542 if (uio->uio_resid > 0 && base_offset <= uio->uio_offset) { 543 hammer_done_transaction(&trans); 544 return (EFBIG); 545 } 546 547 if (uio->uio_resid > 0 && (td = uio->uio_td) != NULL && td->td_proc && 548 base_offset > td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 549 hammer_done_transaction(&trans); 550 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ); 551 return (EFBIG); 552 } 553 554 /* 555 * If reading or writing a huge amount of data we have to break 556 * atomicy and allow the operation to be interrupted by a signal 557 * or it can DOS the machine. 558 * 559 * Preset redo_count so we stop generating REDOs earlier if the 560 * limit is exceeded. 561 * 562 * redo_count is heuristical, SMP races are ok 563 */ 564 bigwrite = (uio->uio_resid > 100 * 1024 * 1024); 565 if ((ip->flags & HAMMER_INODE_REDO) && 566 ip->redo_count < hammer_limit_redo) { 567 ip->redo_count += uio->uio_resid; 568 } 569 570 /* 571 * Access the data typically in HAMMER_BUFSIZE blocks via the 572 * buffer cache, but HAMMER may use a variable block size based 573 * on the offset. 574 */ 575 while (uio->uio_resid > 0) { 576 int fixsize = 0; 577 int blksize; 578 int blkmask; 579 int trivial; 580 int endofblk; 581 off_t nsize; 582 583 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE)) != 0) 584 break; 585 if (bigwrite && (error = hammer_signal_check(hmp)) != 0) 586 break; 587 588 blksize = hammer_blocksize(uio->uio_offset); 589 590 /* 591 * Control the number of pending records associated with 592 * this inode. If too many have accumulated start a 593 * flush. Try to maintain a pipeline with the flusher. 594 * 595 * NOTE: It is possible for other sources to grow the 596 * records but not necessarily issue another flush, 597 * so use a timeout and ensure that a re-flush occurs. 598 */ 599 if (ip->rsv_recs >= hammer_limit_inode_recs) { 600 lwkt_gettoken(&hmp->fs_token); 601 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 602 while (ip->rsv_recs >= hammer_limit_inode_recs * 2) { 603 ip->flags |= HAMMER_INODE_RECSW; 604 tsleep(&ip->rsv_recs, 0, "hmrwww", hz); 605 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 606 } 607 lwkt_reltoken(&hmp->fs_token); 608 } 609 610 /* 611 * Do not allow HAMMER to blow out the buffer cache. Very 612 * large UIOs can lockout other processes due to bwillwrite() 613 * mechanics. 614 * 615 * The hammer inode is not locked during these operations. 616 * The vnode is locked which can interfere with the pageout 617 * daemon for non-UIO_NOCOPY writes but should not interfere 618 * with the buffer cache. Even so, we cannot afford to 619 * allow the pageout daemon to build up too many dirty buffer 620 * cache buffers. 621 * 622 * Only call this if we aren't being recursively called from 623 * a virtual disk device (vn), else we may deadlock. 624 */ 625 if ((ap->a_ioflag & IO_RECURSE) == 0) 626 bwillwrite(blksize); 627 628 /* 629 * Calculate the blocksize at the current offset and figure 630 * out how much we can actually write. 631 */ 632 blkmask = blksize - 1; 633 offset = (int)uio->uio_offset & blkmask; 634 base_offset = uio->uio_offset & ~(int64_t)blkmask; 635 n = blksize - offset; 636 if (n > uio->uio_resid) { 637 n = uio->uio_resid; 638 endofblk = 0; 639 } else { 640 endofblk = 1; 641 } 642 nsize = uio->uio_offset + n; 643 if (nsize > ip->ino_data.size) { 644 if (uio->uio_offset > ip->ino_data.size) 645 trivial = 0; 646 else 647 trivial = 1; 648 nvextendbuf(ap->a_vp, 649 ip->ino_data.size, 650 nsize, 651 hammer_blocksize(ip->ino_data.size), 652 hammer_blocksize(nsize), 653 hammer_blockoff(ip->ino_data.size), 654 hammer_blockoff(nsize), 655 trivial); 656 fixsize = 1; 657 kflags |= NOTE_EXTEND; 658 } 659 660 if (uio->uio_segflg == UIO_NOCOPY) { 661 /* 662 * Issuing a write with the same data backing the 663 * buffer. Instantiate the buffer to collect the 664 * backing vm pages, then read-in any missing bits. 665 * 666 * This case is used by vop_stdputpages(). 667 */ 668 bp = getblk(ap->a_vp, base_offset, 669 blksize, GETBLK_BHEAVY, 0); 670 if ((bp->b_flags & B_CACHE) == 0) { 671 bqrelse(bp); 672 error = bread(ap->a_vp, base_offset, 673 blksize, &bp); 674 } 675 } else if (offset == 0 && uio->uio_resid >= blksize) { 676 /* 677 * Even though we are entirely overwriting the buffer 678 * we may still have to zero it out to avoid a 679 * mmap/write visibility issue. 680 */ 681 bp = getblk(ap->a_vp, base_offset, blksize, GETBLK_BHEAVY, 0); 682 if ((bp->b_flags & B_CACHE) == 0) 683 vfs_bio_clrbuf(bp); 684 } else if (base_offset >= ip->ino_data.size) { 685 /* 686 * If the base offset of the buffer is beyond the 687 * file EOF, we don't have to issue a read. 688 */ 689 bp = getblk(ap->a_vp, base_offset, 690 blksize, GETBLK_BHEAVY, 0); 691 vfs_bio_clrbuf(bp); 692 } else { 693 /* 694 * Partial overwrite, read in any missing bits then 695 * replace the portion being written. 696 */ 697 error = bread(ap->a_vp, base_offset, blksize, &bp); 698 if (error == 0) 699 bheavy(bp); 700 } 701 if (error == 0) 702 error = uiomovebp(bp, bp->b_data + offset, n, uio); 703 704 lwkt_gettoken(&hmp->fs_token); 705 706 /* 707 * Generate REDO records if enabled and redo_count will not 708 * exceeded the limit. 709 * 710 * If redo_count exceeds the limit we stop generating records 711 * and clear HAMMER_INODE_REDO. This will cause the next 712 * fsync() to do a full meta-data sync instead of just an 713 * UNDO/REDO fifo update. 714 * 715 * When clearing HAMMER_INODE_REDO any pre-existing REDOs 716 * will still be tracked. The tracks will be terminated 717 * when the related meta-data (including possible data 718 * modifications which are not tracked via REDO) is 719 * flushed. 720 */ 721 if ((ip->flags & HAMMER_INODE_REDO) && error == 0) { 722 if (ip->redo_count < hammer_limit_redo) { 723 bp->b_flags |= B_VFSFLAG1; 724 error = hammer_generate_redo(&trans, ip, 725 base_offset + offset, 726 HAMMER_REDO_WRITE, 727 bp->b_data + offset, 728 (size_t)n); 729 } else { 730 ip->flags &= ~HAMMER_INODE_REDO; 731 } 732 } 733 734 /* 735 * If we screwed up we have to undo any VM size changes we 736 * made. 737 */ 738 if (error) { 739 brelse(bp); 740 if (fixsize) { 741 nvtruncbuf(ap->a_vp, ip->ino_data.size, 742 hammer_blocksize(ip->ino_data.size), 743 hammer_blockoff(ip->ino_data.size), 744 0); 745 } 746 lwkt_reltoken(&hmp->fs_token); 747 break; 748 } 749 kflags |= NOTE_WRITE; 750 hammer_stats_file_write += n; 751 if (blksize == HAMMER_XBUFSIZE) 752 bp->b_flags |= B_CLUSTEROK; 753 if (ip->ino_data.size < uio->uio_offset) { 754 ip->ino_data.size = uio->uio_offset; 755 flags = HAMMER_INODE_SDIRTY; 756 } else { 757 flags = 0; 758 } 759 ip->ino_data.mtime = trans.time; 760 flags |= HAMMER_INODE_MTIME | HAMMER_INODE_BUFS; 761 hammer_modify_inode(&trans, ip, flags); 762 763 /* 764 * Once we dirty the buffer any cached zone-X offset 765 * becomes invalid. HAMMER NOTE: no-history mode cannot 766 * allow overwriting over the same data sector unless 767 * we provide UNDOs for the old data, which we don't. 768 */ 769 bp->b_bio2.bio_offset = NOOFFSET; 770 771 lwkt_reltoken(&hmp->fs_token); 772 773 /* 774 * Final buffer disposition. 775 * 776 * Because meta-data updates are deferred, HAMMER is 777 * especially sensitive to excessive bdwrite()s because 778 * the I/O stream is not broken up by disk reads. So the 779 * buffer cache simply cannot keep up. 780 * 781 * WARNING! blksize is variable. cluster_write() is 782 * expected to not blow up if it encounters 783 * buffers that do not match the passed blksize. 784 * 785 * NOTE! Hammer shouldn't need to bawrite()/cluster_write(). 786 * The ip->rsv_recs check should burst-flush the data. 787 * If we queue it immediately the buf could be left 788 * locked on the device queue for a very long time. 789 * 790 * However, failing to flush a dirty buffer out when 791 * issued from the pageout daemon can result in a low 792 * memory deadlock against bio_page_alloc(), so we 793 * have to bawrite() on IO_ASYNC as well. 794 * 795 * NOTE! To avoid degenerate stalls due to mismatched block 796 * sizes we only honor IO_DIRECT on the write which 797 * abuts the end of the buffer. However, we must 798 * honor IO_SYNC in case someone is silly enough to 799 * configure a HAMMER file as swap, or when HAMMER 800 * is serving NFS (for commits). Ick ick. 801 */ 802 bp->b_flags |= B_AGE; 803 if (blksize == HAMMER_XBUFSIZE) 804 bp->b_flags |= B_CLUSTEROK; 805 806 if (ap->a_ioflag & IO_SYNC) { 807 bwrite(bp); 808 } else if ((ap->a_ioflag & IO_DIRECT) && endofblk) { 809 bawrite(bp); 810 } else if (ap->a_ioflag & IO_ASYNC) { 811 bawrite(bp); 812 } else if (hammer_cluster_enable && 813 !(ap->a_vp->v_mount->mnt_flag & MNT_NOCLUSTERW)) { 814 if (base_offset < HAMMER_XDEMARC) 815 cluster_eof = hammer_blockdemarc(base_offset, 816 ip->ino_data.size); 817 else 818 cluster_eof = ip->ino_data.size; 819 cluster_write(bp, cluster_eof, blksize, seqcount); 820 } else { 821 bdwrite(bp); 822 } 823 } 824 hammer_done_transaction(&trans); 825 hammer_knote(ap->a_vp, kflags); 826 827 return (error); 828 } 829 830 /* 831 * hammer_vop_access { vp, mode, cred } 832 * 833 * MPSAFE - does not require fs_token 834 */ 835 static 836 int 837 hammer_vop_access(struct vop_access_args *ap) 838 { 839 struct hammer_inode *ip = VTOI(ap->a_vp); 840 uid_t uid; 841 gid_t gid; 842 int error; 843 844 ++hammer_stats_file_iopsr; 845 uid = hammer_to_unix_xid(&ip->ino_data.uid); 846 gid = hammer_to_unix_xid(&ip->ino_data.gid); 847 848 error = vop_helper_access(ap, uid, gid, ip->ino_data.mode, 849 ip->ino_data.uflags); 850 return (error); 851 } 852 853 /* 854 * hammer_vop_advlock { vp, id, op, fl, flags } 855 * 856 * MPSAFE - does not require fs_token 857 */ 858 static 859 int 860 hammer_vop_advlock(struct vop_advlock_args *ap) 861 { 862 hammer_inode_t ip = VTOI(ap->a_vp); 863 864 return (lf_advlock(ap, &ip->advlock, ip->ino_data.size)); 865 } 866 867 /* 868 * hammer_vop_close { vp, fflag } 869 * 870 * We can only sync-on-close for normal closes. XXX disabled for now. 871 */ 872 static 873 int 874 hammer_vop_close(struct vop_close_args *ap) 875 { 876 #if 0 877 struct vnode *vp = ap->a_vp; 878 hammer_inode_t ip = VTOI(vp); 879 int waitfor; 880 if (ip->flags & (HAMMER_INODE_CLOSESYNC|HAMMER_INODE_CLOSEASYNC)) { 881 if (vn_islocked(vp) == LK_EXCLUSIVE && 882 (vp->v_flag & (VINACTIVE|VRECLAIMED)) == 0) { 883 if (ip->flags & HAMMER_INODE_CLOSESYNC) 884 waitfor = MNT_WAIT; 885 else 886 waitfor = MNT_NOWAIT; 887 ip->flags &= ~(HAMMER_INODE_CLOSESYNC | 888 HAMMER_INODE_CLOSEASYNC); 889 VOP_FSYNC(vp, MNT_NOWAIT, waitfor); 890 } 891 } 892 #endif 893 return (vop_stdclose(ap)); 894 } 895 896 /* 897 * hammer_vop_ncreate { nch, dvp, vpp, cred, vap } 898 * 899 * The operating system has already ensured that the directory entry 900 * does not exist and done all appropriate namespace locking. 901 */ 902 static 903 int 904 hammer_vop_ncreate(struct vop_ncreate_args *ap) 905 { 906 struct hammer_transaction trans; 907 struct hammer_inode *dip; 908 struct hammer_inode *nip; 909 struct nchandle *nch; 910 hammer_mount_t hmp; 911 int error; 912 913 nch = ap->a_nch; 914 dip = VTOI(ap->a_dvp); 915 hmp = dip->hmp; 916 917 if (dip->flags & HAMMER_INODE_RO) 918 return (EROFS); 919 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 920 return (error); 921 922 /* 923 * Create a transaction to cover the operations we perform. 924 */ 925 lwkt_gettoken(&hmp->fs_token); 926 hammer_start_transaction(&trans, hmp); 927 ++hammer_stats_file_iopsw; 928 929 /* 930 * Create a new filesystem object of the requested type. The 931 * returned inode will be referenced and shared-locked to prevent 932 * it from being moved to the flusher. 933 */ 934 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 935 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 936 NULL, &nip); 937 if (error) { 938 hkprintf("hammer_create_inode error %d\n", error); 939 hammer_done_transaction(&trans); 940 *ap->a_vpp = NULL; 941 lwkt_reltoken(&hmp->fs_token); 942 return (error); 943 } 944 945 /* 946 * Add the new filesystem object to the directory. This will also 947 * bump the inode's link count. 948 */ 949 error = hammer_ip_add_direntry(&trans, dip, 950 nch->ncp->nc_name, nch->ncp->nc_nlen, 951 nip); 952 if (error) 953 hkprintf("hammer_ip_add_direntry error %d\n", error); 954 955 /* 956 * Finish up. 957 */ 958 if (error) { 959 hammer_rel_inode(nip, 0); 960 hammer_done_transaction(&trans); 961 *ap->a_vpp = NULL; 962 } else { 963 error = hammer_get_vnode(nip, ap->a_vpp); 964 hammer_done_transaction(&trans); 965 hammer_rel_inode(nip, 0); 966 if (error == 0) { 967 cache_setunresolved(ap->a_nch); 968 cache_setvp(ap->a_nch, *ap->a_vpp); 969 } 970 hammer_knote(ap->a_dvp, NOTE_WRITE); 971 } 972 lwkt_reltoken(&hmp->fs_token); 973 return (error); 974 } 975 976 /* 977 * hammer_vop_getattr { vp, vap } 978 * 979 * Retrieve an inode's attribute information. When accessing inodes 980 * historically we fake the atime field to ensure consistent results. 981 * The atime field is stored in the B-Tree element and allowed to be 982 * updated without cycling the element. 983 * 984 * MPSAFE - does not require fs_token 985 */ 986 static 987 int 988 hammer_vop_getattr(struct vop_getattr_args *ap) 989 { 990 struct hammer_inode *ip = VTOI(ap->a_vp); 991 struct vattr *vap = ap->a_vap; 992 993 /* 994 * We want the fsid to be different when accessing a filesystem 995 * with different as-of's so programs like diff don't think 996 * the files are the same. 997 * 998 * We also want the fsid to be the same when comparing snapshots, 999 * or when comparing mirrors (which might be backed by different 1000 * physical devices). HAMMER fsids are based on the PFS's 1001 * shared_uuid field. 1002 * 1003 * XXX there is a chance of collision here. The va_fsid reported 1004 * by stat is different from the more involved fsid used in the 1005 * mount structure. 1006 */ 1007 ++hammer_stats_file_iopsr; 1008 hammer_lock_sh(&ip->lock); 1009 vap->va_fsid = ip->pfsm->fsid_udev ^ (uint32_t)ip->obj_asof ^ 1010 (uint32_t)(ip->obj_asof >> 32); 1011 1012 vap->va_fileid = ip->ino_leaf.base.obj_id; 1013 vap->va_mode = ip->ino_data.mode; 1014 vap->va_nlink = ip->ino_data.nlinks; 1015 vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid); 1016 vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid); 1017 vap->va_rmajor = 0; 1018 vap->va_rminor = 0; 1019 vap->va_size = ip->ino_data.size; 1020 1021 /* 1022 * Special case for @@PFS softlinks. The actual size of the 1023 * expanded softlink is "@@0x%016llx:%05d" == 26 bytes. 1024 * or for MAX_TID is "@@-1:%05d" == 10 bytes. 1025 * 1026 * Note that userspace hammer command does not allow users to 1027 * create a @@PFS softlink under an existing other PFS (id!=0) 1028 * so the ip localization here for @@PFS softlink is always 0. 1029 */ 1030 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_SOFTLINK && 1031 ip->ino_data.size == 10 && 1032 ip->obj_asof == HAMMER_MAX_TID && 1033 ip->obj_localization == HAMMER_DEF_LOCALIZATION && 1034 strncmp(ip->ino_data.ext.symlink, "@@PFS", 5) == 0) { 1035 if (hammer_is_pfs_slave(&ip->pfsm->pfsd)) 1036 vap->va_size = 26; 1037 else 1038 vap->va_size = 10; 1039 } 1040 1041 /* 1042 * We must provide a consistent atime and mtime for snapshots 1043 * so people can do a 'tar cf - ... | md5' on them and get 1044 * consistent results. 1045 */ 1046 if (ip->flags & HAMMER_INODE_RO) { 1047 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_atime); 1048 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_mtime); 1049 } else { 1050 hammer_time_to_timespec(ip->ino_data.atime, &vap->va_atime); 1051 hammer_time_to_timespec(ip->ino_data.mtime, &vap->va_mtime); 1052 } 1053 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_ctime); 1054 vap->va_flags = ip->ino_data.uflags; 1055 vap->va_gen = 1; /* hammer inums are unique for all time */ 1056 vap->va_blocksize = HAMMER_BUFSIZE; 1057 if (ip->ino_data.size >= HAMMER_XDEMARC) { 1058 vap->va_bytes = (ip->ino_data.size + HAMMER_XBUFMASK64) & 1059 ~HAMMER_XBUFMASK64; 1060 } else if (ip->ino_data.size > HAMMER_HBUFSIZE) { 1061 vap->va_bytes = (ip->ino_data.size + HAMMER_BUFMASK64) & 1062 ~HAMMER_BUFMASK64; 1063 } else { 1064 vap->va_bytes = (ip->ino_data.size + 15) & ~15; 1065 } 1066 1067 vap->va_type = hammer_get_vnode_type(ip->ino_data.obj_type); 1068 vap->va_filerev = 0; /* XXX */ 1069 vap->va_uid_uuid = ip->ino_data.uid; 1070 vap->va_gid_uuid = ip->ino_data.gid; 1071 vap->va_fsid_uuid = ip->hmp->fsid; 1072 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID | 1073 VA_FSID_UUID_VALID; 1074 1075 switch (ip->ino_data.obj_type) { 1076 case HAMMER_OBJTYPE_CDEV: 1077 case HAMMER_OBJTYPE_BDEV: 1078 vap->va_rmajor = ip->ino_data.rmajor; 1079 vap->va_rminor = ip->ino_data.rminor; 1080 break; 1081 default: 1082 break; 1083 } 1084 hammer_unlock(&ip->lock); 1085 return(0); 1086 } 1087 1088 /* 1089 * hammer_vop_nresolve { nch, dvp, cred } 1090 * 1091 * Locate the requested directory entry. 1092 */ 1093 static 1094 int 1095 hammer_vop_nresolve(struct vop_nresolve_args *ap) 1096 { 1097 struct hammer_transaction trans; 1098 struct namecache *ncp; 1099 hammer_mount_t hmp; 1100 hammer_inode_t dip; 1101 hammer_inode_t ip; 1102 hammer_tid_t asof; 1103 struct hammer_cursor cursor; 1104 struct vnode *vp; 1105 int64_t namekey; 1106 int error; 1107 int i; 1108 int nlen; 1109 int flags; 1110 int ispfs; 1111 int64_t obj_id; 1112 uint32_t localization; 1113 uint32_t max_iterations; 1114 1115 /* 1116 * Misc initialization, plus handle as-of name extensions. Look for 1117 * the '@@' extension. Note that as-of files and directories cannot 1118 * be modified. 1119 */ 1120 dip = VTOI(ap->a_dvp); 1121 ncp = ap->a_nch->ncp; 1122 asof = dip->obj_asof; 1123 localization = dip->obj_localization; /* for code consistency */ 1124 nlen = ncp->nc_nlen; 1125 flags = dip->flags & HAMMER_INODE_RO; 1126 ispfs = 0; 1127 hmp = dip->hmp; 1128 1129 lwkt_gettoken(&hmp->fs_token); 1130 hammer_simple_transaction(&trans, hmp); 1131 ++hammer_stats_file_iopsr; 1132 1133 for (i = 0; i < nlen; ++i) { 1134 if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') { 1135 error = hammer_str_to_tid(ncp->nc_name + i + 2, 1136 &ispfs, &asof, &localization); 1137 if (error != 0) { 1138 i = nlen; 1139 break; 1140 } 1141 if (asof != HAMMER_MAX_TID) 1142 flags |= HAMMER_INODE_RO; 1143 break; 1144 } 1145 } 1146 nlen = i; 1147 1148 /* 1149 * If this is a PFS softlink we dive into the PFS 1150 */ 1151 if (ispfs && nlen == 0) { 1152 ip = hammer_get_inode(&trans, dip, HAMMER_OBJID_ROOT, 1153 asof, localization, 1154 flags, &error); 1155 if (error == 0) { 1156 error = hammer_get_vnode(ip, &vp); 1157 hammer_rel_inode(ip, 0); 1158 } else { 1159 vp = NULL; 1160 } 1161 if (error == 0) { 1162 vn_unlock(vp); 1163 cache_setvp(ap->a_nch, vp); 1164 vrele(vp); 1165 } 1166 goto done; 1167 } 1168 1169 /* 1170 * If there is no path component the time extension is relative to dip. 1171 * e.g. "fubar/@@<snapshot>" 1172 * 1173 * "." is handled by the kernel, but ".@@<snapshot>" is not. 1174 * e.g. "fubar/.@@<snapshot>" 1175 * 1176 * ".." is handled by the kernel. We do not currently handle 1177 * "..@<snapshot>". 1178 */ 1179 if (nlen == 0 || (nlen == 1 && ncp->nc_name[0] == '.')) { 1180 ip = hammer_get_inode(&trans, dip, dip->obj_id, 1181 asof, dip->obj_localization, 1182 flags, &error); 1183 if (error == 0) { 1184 error = hammer_get_vnode(ip, &vp); 1185 hammer_rel_inode(ip, 0); 1186 } else { 1187 vp = NULL; 1188 } 1189 if (error == 0) { 1190 vn_unlock(vp); 1191 cache_setvp(ap->a_nch, vp); 1192 vrele(vp); 1193 } 1194 goto done; 1195 } 1196 1197 /* 1198 * Calculate the namekey and setup the key range for the scan. This 1199 * works kinda like a chained hash table where the lower 32 bits 1200 * of the namekey synthesize the chain. 1201 * 1202 * The key range is inclusive of both key_beg and key_end. 1203 */ 1204 namekey = hammer_direntry_namekey(dip, ncp->nc_name, nlen, 1205 &max_iterations); 1206 1207 error = hammer_init_cursor(&trans, &cursor, &dip->cache[1], dip); 1208 cursor.key_beg.localization = dip->obj_localization | 1209 hammer_dir_localization(dip); 1210 cursor.key_beg.obj_id = dip->obj_id; 1211 cursor.key_beg.key = namekey; 1212 cursor.key_beg.create_tid = 0; 1213 cursor.key_beg.delete_tid = 0; 1214 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 1215 cursor.key_beg.obj_type = 0; 1216 1217 cursor.key_end = cursor.key_beg; 1218 cursor.key_end.key += max_iterations; 1219 cursor.asof = asof; 1220 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 1221 1222 /* 1223 * Scan all matching records (the chain), locate the one matching 1224 * the requested path component. 1225 * 1226 * The hammer_ip_*() functions merge in-memory records with on-disk 1227 * records for the purposes of the search. 1228 */ 1229 obj_id = 0; 1230 localization = HAMMER_DEF_LOCALIZATION; 1231 1232 if (error == 0) { 1233 error = hammer_ip_first(&cursor); 1234 while (error == 0) { 1235 error = hammer_ip_resolve_data(&cursor); 1236 if (error) 1237 break; 1238 if (nlen == cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF && 1239 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) { 1240 obj_id = cursor.data->entry.obj_id; 1241 localization = cursor.data->entry.localization; 1242 break; 1243 } 1244 error = hammer_ip_next(&cursor); 1245 } 1246 } 1247 hammer_done_cursor(&cursor); 1248 1249 /* 1250 * Lookup the obj_id. This should always succeed. If it does not 1251 * the filesystem may be damaged and we return a dummy inode. 1252 */ 1253 if (error == 0) { 1254 ip = hammer_get_inode(&trans, dip, obj_id, 1255 asof, localization, 1256 flags, &error); 1257 if (error == ENOENT) { 1258 hkprintf("WARNING: Missing inode for dirent \"%s\"\n" 1259 "\tobj_id = %016jx, asof=%016jx, lo=%08x\n", 1260 ncp->nc_name, 1261 (intmax_t)obj_id, (intmax_t)asof, 1262 localization); 1263 error = 0; 1264 ip = hammer_get_dummy_inode(&trans, dip, obj_id, 1265 asof, localization, 1266 flags, &error); 1267 } 1268 if (error == 0) { 1269 error = hammer_get_vnode(ip, &vp); 1270 hammer_rel_inode(ip, 0); 1271 } else { 1272 vp = NULL; 1273 } 1274 if (error == 0) { 1275 vn_unlock(vp); 1276 cache_setvp(ap->a_nch, vp); 1277 vrele(vp); 1278 } 1279 } else if (error == ENOENT) { 1280 cache_setvp(ap->a_nch, NULL); 1281 } 1282 done: 1283 hammer_done_transaction(&trans); 1284 lwkt_reltoken(&hmp->fs_token); 1285 return (error); 1286 } 1287 1288 /* 1289 * hammer_vop_nlookupdotdot { dvp, vpp, cred } 1290 * 1291 * Locate the parent directory of a directory vnode. 1292 * 1293 * dvp is referenced but not locked. *vpp must be returned referenced and 1294 * locked. A parent_obj_id of 0 indicates that we are at the root. 1295 * 1296 * NOTE: as-of sequences are not linked into the directory structure. If 1297 * we are at the root with a different asof then the mount point, reload 1298 * the same directory with the mount point's asof. I'm not sure what this 1299 * will do to NFS. We encode ASOF stamps in NFS file handles so it might not 1300 * get confused, but it hasn't been tested. 1301 */ 1302 static 1303 int 1304 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap) 1305 { 1306 struct hammer_transaction trans; 1307 struct hammer_inode *dip; 1308 struct hammer_inode *ip; 1309 hammer_mount_t hmp; 1310 int64_t parent_obj_id; 1311 uint32_t parent_obj_localization; 1312 hammer_tid_t asof; 1313 int error; 1314 1315 dip = VTOI(ap->a_dvp); 1316 asof = dip->obj_asof; 1317 hmp = dip->hmp; 1318 1319 /* 1320 * Whos are parent? This could be the root of a pseudo-filesystem 1321 * whos parent is in another localization domain. 1322 */ 1323 lwkt_gettoken(&hmp->fs_token); 1324 parent_obj_id = dip->ino_data.parent_obj_id; 1325 if (dip->obj_id == HAMMER_OBJID_ROOT) 1326 parent_obj_localization = HAMMER_DEF_LOCALIZATION; 1327 else 1328 parent_obj_localization = dip->obj_localization; 1329 1330 /* 1331 * It's probably a PFS root when dip->ino_data.parent_obj_id is 0. 1332 */ 1333 if (parent_obj_id == 0) { 1334 if (dip->obj_id == HAMMER_OBJID_ROOT && 1335 asof != hmp->asof) { 1336 parent_obj_id = dip->obj_id; 1337 asof = hmp->asof; 1338 *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK); 1339 ksnprintf(*ap->a_fakename, 19, "0x%016jx", 1340 (intmax_t)dip->obj_asof); 1341 } else { 1342 *ap->a_vpp = NULL; 1343 lwkt_reltoken(&hmp->fs_token); 1344 return ENOENT; 1345 } 1346 } 1347 1348 hammer_simple_transaction(&trans, hmp); 1349 ++hammer_stats_file_iopsr; 1350 1351 ip = hammer_get_inode(&trans, dip, parent_obj_id, 1352 asof, parent_obj_localization, 1353 dip->flags, &error); 1354 if (ip) { 1355 error = hammer_get_vnode(ip, ap->a_vpp); 1356 hammer_rel_inode(ip, 0); 1357 } else { 1358 *ap->a_vpp = NULL; 1359 } 1360 hammer_done_transaction(&trans); 1361 lwkt_reltoken(&hmp->fs_token); 1362 return (error); 1363 } 1364 1365 /* 1366 * hammer_vop_nlink { nch, dvp, vp, cred } 1367 */ 1368 static 1369 int 1370 hammer_vop_nlink(struct vop_nlink_args *ap) 1371 { 1372 struct hammer_transaction trans; 1373 struct hammer_inode *dip; 1374 struct hammer_inode *ip; 1375 struct nchandle *nch; 1376 hammer_mount_t hmp; 1377 int error; 1378 1379 if (ap->a_dvp->v_mount != ap->a_vp->v_mount) 1380 return(EXDEV); 1381 1382 nch = ap->a_nch; 1383 dip = VTOI(ap->a_dvp); 1384 ip = VTOI(ap->a_vp); 1385 hmp = dip->hmp; 1386 1387 if (dip->obj_localization != ip->obj_localization) 1388 return(EXDEV); 1389 1390 if (dip->flags & HAMMER_INODE_RO) 1391 return (EROFS); 1392 if (ip->flags & HAMMER_INODE_RO) 1393 return (EROFS); 1394 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1395 return (error); 1396 1397 /* 1398 * Create a transaction to cover the operations we perform. 1399 */ 1400 lwkt_gettoken(&hmp->fs_token); 1401 hammer_start_transaction(&trans, hmp); 1402 ++hammer_stats_file_iopsw; 1403 1404 /* 1405 * Add the filesystem object to the directory. Note that neither 1406 * dip nor ip are referenced or locked, but their vnodes are 1407 * referenced. This function will bump the inode's link count. 1408 */ 1409 error = hammer_ip_add_direntry(&trans, dip, 1410 nch->ncp->nc_name, nch->ncp->nc_nlen, 1411 ip); 1412 1413 /* 1414 * Finish up. 1415 */ 1416 if (error == 0) { 1417 cache_setunresolved(nch); 1418 cache_setvp(nch, ap->a_vp); 1419 } 1420 hammer_done_transaction(&trans); 1421 hammer_knote(ap->a_vp, NOTE_LINK); 1422 hammer_knote(ap->a_dvp, NOTE_WRITE); 1423 lwkt_reltoken(&hmp->fs_token); 1424 return (error); 1425 } 1426 1427 /* 1428 * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap } 1429 * 1430 * The operating system has already ensured that the directory entry 1431 * does not exist and done all appropriate namespace locking. 1432 */ 1433 static 1434 int 1435 hammer_vop_nmkdir(struct vop_nmkdir_args *ap) 1436 { 1437 struct hammer_transaction trans; 1438 struct hammer_inode *dip; 1439 struct hammer_inode *nip; 1440 struct nchandle *nch; 1441 hammer_mount_t hmp; 1442 int error; 1443 1444 nch = ap->a_nch; 1445 dip = VTOI(ap->a_dvp); 1446 hmp = dip->hmp; 1447 1448 if (dip->flags & HAMMER_INODE_RO) 1449 return (EROFS); 1450 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1451 return (error); 1452 1453 /* 1454 * Create a transaction to cover the operations we perform. 1455 */ 1456 lwkt_gettoken(&hmp->fs_token); 1457 hammer_start_transaction(&trans, hmp); 1458 ++hammer_stats_file_iopsw; 1459 1460 /* 1461 * Create a new filesystem object of the requested type. The 1462 * returned inode will be referenced but not locked. 1463 */ 1464 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 1465 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 1466 NULL, &nip); 1467 if (error) { 1468 hammer_done_transaction(&trans); 1469 *ap->a_vpp = NULL; 1470 lwkt_reltoken(&hmp->fs_token); 1471 return (error); 1472 } 1473 /* 1474 * Add the new filesystem object to the directory. This will also 1475 * bump the inode's link count. 1476 */ 1477 error = hammer_ip_add_direntry(&trans, dip, 1478 nch->ncp->nc_name, nch->ncp->nc_nlen, 1479 nip); 1480 if (error) 1481 hkprintf("hammer_mkdir (add) error %d\n", error); 1482 1483 /* 1484 * Finish up. 1485 */ 1486 if (error) { 1487 hammer_rel_inode(nip, 0); 1488 *ap->a_vpp = NULL; 1489 } else { 1490 error = hammer_get_vnode(nip, ap->a_vpp); 1491 hammer_rel_inode(nip, 0); 1492 if (error == 0) { 1493 cache_setunresolved(ap->a_nch); 1494 cache_setvp(ap->a_nch, *ap->a_vpp); 1495 } 1496 } 1497 hammer_done_transaction(&trans); 1498 if (error == 0) 1499 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1500 lwkt_reltoken(&hmp->fs_token); 1501 return (error); 1502 } 1503 1504 /* 1505 * hammer_vop_nmknod { nch, dvp, vpp, cred, vap } 1506 * 1507 * The operating system has already ensured that the directory entry 1508 * does not exist and done all appropriate namespace locking. 1509 */ 1510 static 1511 int 1512 hammer_vop_nmknod(struct vop_nmknod_args *ap) 1513 { 1514 struct hammer_transaction trans; 1515 struct hammer_inode *dip; 1516 struct hammer_inode *nip; 1517 struct nchandle *nch; 1518 hammer_mount_t hmp; 1519 int error; 1520 1521 nch = ap->a_nch; 1522 dip = VTOI(ap->a_dvp); 1523 hmp = dip->hmp; 1524 1525 if (dip->flags & HAMMER_INODE_RO) 1526 return (EROFS); 1527 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1528 return (error); 1529 1530 /* 1531 * Create a transaction to cover the operations we perform. 1532 */ 1533 lwkt_gettoken(&hmp->fs_token); 1534 hammer_start_transaction(&trans, hmp); 1535 ++hammer_stats_file_iopsw; 1536 1537 /* 1538 * Create a new filesystem object of the requested type. The 1539 * returned inode will be referenced but not locked. 1540 * 1541 * If mknod specifies a directory a pseudo-fs is created. 1542 */ 1543 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 1544 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 1545 NULL, &nip); 1546 if (error) { 1547 hammer_done_transaction(&trans); 1548 *ap->a_vpp = NULL; 1549 lwkt_reltoken(&hmp->fs_token); 1550 return (error); 1551 } 1552 1553 /* 1554 * Add the new filesystem object to the directory. This will also 1555 * bump the inode's link count. 1556 */ 1557 error = hammer_ip_add_direntry(&trans, dip, 1558 nch->ncp->nc_name, nch->ncp->nc_nlen, 1559 nip); 1560 1561 /* 1562 * Finish up. 1563 */ 1564 if (error) { 1565 hammer_rel_inode(nip, 0); 1566 *ap->a_vpp = NULL; 1567 } else { 1568 error = hammer_get_vnode(nip, ap->a_vpp); 1569 hammer_rel_inode(nip, 0); 1570 if (error == 0) { 1571 cache_setunresolved(ap->a_nch); 1572 cache_setvp(ap->a_nch, *ap->a_vpp); 1573 } 1574 } 1575 hammer_done_transaction(&trans); 1576 if (error == 0) 1577 hammer_knote(ap->a_dvp, NOTE_WRITE); 1578 lwkt_reltoken(&hmp->fs_token); 1579 return (error); 1580 } 1581 1582 /* 1583 * hammer_vop_open { vp, mode, cred, fp } 1584 * 1585 * MPSAFE (does not require fs_token) 1586 */ 1587 static 1588 int 1589 hammer_vop_open(struct vop_open_args *ap) 1590 { 1591 hammer_inode_t ip; 1592 1593 ++hammer_stats_file_iopsr; 1594 ip = VTOI(ap->a_vp); 1595 1596 if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO)) 1597 return (EROFS); 1598 return(vop_stdopen(ap)); 1599 } 1600 1601 /* 1602 * hammer_vop_print { vp } 1603 */ 1604 static 1605 int 1606 hammer_vop_print(struct vop_print_args *ap) 1607 { 1608 return EOPNOTSUPP; 1609 } 1610 1611 /* 1612 * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies } 1613 */ 1614 static 1615 int 1616 hammer_vop_readdir(struct vop_readdir_args *ap) 1617 { 1618 struct hammer_transaction trans; 1619 struct hammer_cursor cursor; 1620 struct hammer_inode *ip; 1621 hammer_mount_t hmp; 1622 struct uio *uio; 1623 hammer_base_elm_t base; 1624 int error; 1625 int cookie_index; 1626 int ncookies; 1627 off_t *cookies; 1628 off_t saveoff; 1629 int r; 1630 int dtype; 1631 1632 ++hammer_stats_file_iopsr; 1633 ip = VTOI(ap->a_vp); 1634 uio = ap->a_uio; 1635 saveoff = uio->uio_offset; 1636 hmp = ip->hmp; 1637 1638 if (ap->a_ncookies) { 1639 ncookies = uio->uio_resid / 16 + 1; 1640 if (ncookies > 1024) 1641 ncookies = 1024; 1642 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 1643 cookie_index = 0; 1644 } else { 1645 ncookies = -1; 1646 cookies = NULL; 1647 cookie_index = 0; 1648 } 1649 1650 lwkt_gettoken(&hmp->fs_token); 1651 hammer_simple_transaction(&trans, hmp); 1652 1653 /* 1654 * Handle artificial entries 1655 * 1656 * It should be noted that the minimum value for a directory 1657 * hash key on-media is 0x0000000100000000, so we can use anything 1658 * less then that to represent our 'special' key space. 1659 */ 1660 error = 0; 1661 if (saveoff == 0) { 1662 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, "."); 1663 if (r) 1664 goto done; 1665 if (cookies) 1666 cookies[cookie_index] = saveoff; 1667 ++saveoff; 1668 ++cookie_index; 1669 if (cookie_index == ncookies) 1670 goto done; 1671 } 1672 if (saveoff == 1) { 1673 if (ip->ino_data.parent_obj_id) { 1674 r = vop_write_dirent(&error, uio, 1675 ip->ino_data.parent_obj_id, 1676 DT_DIR, 2, ".."); 1677 } else { 1678 r = vop_write_dirent(&error, uio, 1679 ip->obj_id, DT_DIR, 2, ".."); 1680 } 1681 if (r) 1682 goto done; 1683 if (cookies) 1684 cookies[cookie_index] = saveoff; 1685 ++saveoff; 1686 ++cookie_index; 1687 if (cookie_index == ncookies) 1688 goto done; 1689 } 1690 1691 /* 1692 * Key range (begin and end inclusive) to scan. Directory keys 1693 * directly translate to a 64 bit 'seek' position. 1694 */ 1695 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 1696 cursor.key_beg.localization = ip->obj_localization | 1697 hammer_dir_localization(ip); 1698 cursor.key_beg.obj_id = ip->obj_id; 1699 cursor.key_beg.create_tid = 0; 1700 cursor.key_beg.delete_tid = 0; 1701 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 1702 cursor.key_beg.obj_type = 0; 1703 cursor.key_beg.key = saveoff; 1704 1705 cursor.key_end = cursor.key_beg; 1706 cursor.key_end.key = HAMMER_MAX_KEY; 1707 cursor.asof = ip->obj_asof; 1708 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 1709 1710 error = hammer_ip_first(&cursor); 1711 1712 while (error == 0) { 1713 error = hammer_ip_resolve_data(&cursor); 1714 if (error) 1715 break; 1716 base = &cursor.leaf->base; 1717 saveoff = base->key; 1718 KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF); 1719 1720 if (base->obj_id != ip->obj_id) 1721 hpanic("bad record at %p", cursor.node); 1722 1723 /* 1724 * Convert pseudo-filesystems into softlinks 1725 */ 1726 dtype = hammer_get_dtype(cursor.leaf->base.obj_type); 1727 r = vop_write_dirent( 1728 &error, uio, cursor.data->entry.obj_id, 1729 dtype, 1730 cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF , 1731 (void *)cursor.data->entry.name); 1732 if (r) 1733 break; 1734 ++saveoff; 1735 if (cookies) 1736 cookies[cookie_index] = base->key; 1737 ++cookie_index; 1738 if (cookie_index == ncookies) 1739 break; 1740 error = hammer_ip_next(&cursor); 1741 } 1742 hammer_done_cursor(&cursor); 1743 1744 done: 1745 hammer_done_transaction(&trans); 1746 1747 if (ap->a_eofflag) 1748 *ap->a_eofflag = (error == ENOENT); 1749 uio->uio_offset = saveoff; 1750 if (error && cookie_index == 0) { 1751 if (error == ENOENT) 1752 error = 0; 1753 if (cookies) { 1754 kfree(cookies, M_TEMP); 1755 *ap->a_ncookies = 0; 1756 *ap->a_cookies = NULL; 1757 } 1758 } else { 1759 if (error == ENOENT) 1760 error = 0; 1761 if (cookies) { 1762 *ap->a_ncookies = cookie_index; 1763 *ap->a_cookies = cookies; 1764 } 1765 } 1766 lwkt_reltoken(&hmp->fs_token); 1767 return(error); 1768 } 1769 1770 /* 1771 * hammer_vop_readlink { vp, uio, cred } 1772 */ 1773 static 1774 int 1775 hammer_vop_readlink(struct vop_readlink_args *ap) 1776 { 1777 struct hammer_transaction trans; 1778 struct hammer_cursor cursor; 1779 struct hammer_inode *ip; 1780 hammer_mount_t hmp; 1781 char buf[32]; 1782 uint32_t localization; 1783 hammer_pseudofs_inmem_t pfsm; 1784 int error; 1785 1786 ip = VTOI(ap->a_vp); 1787 hmp = ip->hmp; 1788 1789 lwkt_gettoken(&hmp->fs_token); 1790 1791 /* 1792 * Shortcut if the symlink data was stuffed into ino_data. 1793 * 1794 * Also expand special "@@PFS%05d" softlinks (expansion only 1795 * occurs for non-historical (current) accesses made from the 1796 * primary filesystem). 1797 * 1798 * Note that userspace hammer command does not allow users to 1799 * create a @@PFS softlink under an existing other PFS (id!=0) 1800 * so the ip localization here for @@PFS softlink is always 0. 1801 */ 1802 if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) { 1803 char *ptr; 1804 int bytes; 1805 1806 ptr = ip->ino_data.ext.symlink; 1807 bytes = (int)ip->ino_data.size; 1808 if (bytes == 10 && 1809 ip->obj_asof == HAMMER_MAX_TID && 1810 ip->obj_localization == HAMMER_DEF_LOCALIZATION && 1811 strncmp(ptr, "@@PFS", 5) == 0) { 1812 hammer_simple_transaction(&trans, hmp); 1813 bcopy(ptr + 5, buf, 5); 1814 buf[5] = 0; 1815 localization = pfs_to_lo(strtoul(buf, NULL, 10)); 1816 pfsm = hammer_load_pseudofs(&trans, localization, 1817 &error); 1818 if (error == 0) { 1819 if (hammer_is_pfs_slave(&pfsm->pfsd)) { 1820 /* vap->va_size == 26 */ 1821 ksnprintf(buf, sizeof(buf), 1822 "@@0x%016jx:%05d", 1823 (intmax_t)pfsm->pfsd.sync_end_tid, 1824 lo_to_pfs(localization)); 1825 } else { 1826 /* vap->va_size == 10 */ 1827 ksnprintf(buf, sizeof(buf), 1828 "@@-1:%05d", 1829 lo_to_pfs(localization)); 1830 } 1831 ptr = buf; 1832 bytes = strlen(buf); 1833 } 1834 if (pfsm) 1835 hammer_rel_pseudofs(hmp, pfsm); 1836 hammer_done_transaction(&trans); 1837 } 1838 error = uiomove(ptr, bytes, ap->a_uio); 1839 lwkt_reltoken(&hmp->fs_token); 1840 return(error); 1841 } 1842 1843 /* 1844 * Long version 1845 */ 1846 hammer_simple_transaction(&trans, hmp); 1847 ++hammer_stats_file_iopsr; 1848 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 1849 1850 /* 1851 * Key range (begin and end inclusive) to scan. Directory keys 1852 * directly translate to a 64 bit 'seek' position. 1853 */ 1854 cursor.key_beg.localization = ip->obj_localization | 1855 HAMMER_LOCALIZE_MISC; 1856 cursor.key_beg.obj_id = ip->obj_id; 1857 cursor.key_beg.create_tid = 0; 1858 cursor.key_beg.delete_tid = 0; 1859 cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX; 1860 cursor.key_beg.obj_type = 0; 1861 cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK; 1862 cursor.asof = ip->obj_asof; 1863 cursor.flags |= HAMMER_CURSOR_ASOF; 1864 1865 error = hammer_ip_lookup(&cursor); 1866 if (error == 0) { 1867 error = hammer_ip_resolve_data(&cursor); 1868 if (error == 0) { 1869 KKASSERT(cursor.leaf->data_len >= 1870 HAMMER_SYMLINK_NAME_OFF); 1871 error = uiomove(cursor.data->symlink.name, 1872 cursor.leaf->data_len - 1873 HAMMER_SYMLINK_NAME_OFF, 1874 ap->a_uio); 1875 } 1876 } 1877 hammer_done_cursor(&cursor); 1878 hammer_done_transaction(&trans); 1879 lwkt_reltoken(&hmp->fs_token); 1880 return(error); 1881 } 1882 1883 /* 1884 * hammer_vop_nremove { nch, dvp, cred } 1885 */ 1886 static 1887 int 1888 hammer_vop_nremove(struct vop_nremove_args *ap) 1889 { 1890 struct hammer_transaction trans; 1891 struct hammer_inode *dip; 1892 hammer_mount_t hmp; 1893 int error; 1894 1895 dip = VTOI(ap->a_dvp); 1896 hmp = dip->hmp; 1897 1898 if (hammer_nohistory(dip) == 0 && 1899 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 1900 return (error); 1901 } 1902 1903 lwkt_gettoken(&hmp->fs_token); 1904 hammer_start_transaction(&trans, hmp); 1905 ++hammer_stats_file_iopsw; 1906 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 0); 1907 hammer_done_transaction(&trans); 1908 if (error == 0) 1909 hammer_knote(ap->a_dvp, NOTE_WRITE); 1910 lwkt_reltoken(&hmp->fs_token); 1911 return (error); 1912 } 1913 1914 /* 1915 * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred } 1916 */ 1917 static 1918 int 1919 hammer_vop_nrename(struct vop_nrename_args *ap) 1920 { 1921 struct hammer_transaction trans; 1922 struct namecache *fncp; 1923 struct namecache *tncp; 1924 struct hammer_inode *fdip; 1925 struct hammer_inode *tdip; 1926 struct hammer_inode *ip; 1927 hammer_mount_t hmp; 1928 struct hammer_cursor cursor; 1929 int64_t namekey; 1930 uint32_t max_iterations; 1931 int nlen, error; 1932 1933 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount) 1934 return(EXDEV); 1935 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount) 1936 return(EXDEV); 1937 1938 fdip = VTOI(ap->a_fdvp); 1939 tdip = VTOI(ap->a_tdvp); 1940 fncp = ap->a_fnch->ncp; 1941 tncp = ap->a_tnch->ncp; 1942 ip = VTOI(fncp->nc_vp); 1943 KKASSERT(ip != NULL); 1944 1945 hmp = ip->hmp; 1946 1947 if (fdip->obj_localization != tdip->obj_localization) 1948 return(EXDEV); 1949 if (fdip->obj_localization != ip->obj_localization) 1950 return(EXDEV); 1951 1952 if (fdip->flags & HAMMER_INODE_RO) 1953 return (EROFS); 1954 if (tdip->flags & HAMMER_INODE_RO) 1955 return (EROFS); 1956 if (ip->flags & HAMMER_INODE_RO) 1957 return (EROFS); 1958 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1959 return (error); 1960 1961 lwkt_gettoken(&hmp->fs_token); 1962 hammer_start_transaction(&trans, hmp); 1963 ++hammer_stats_file_iopsw; 1964 1965 /* 1966 * Remove tncp from the target directory and then link ip as 1967 * tncp. XXX pass trans to dounlink 1968 * 1969 * Force the inode sync-time to match the transaction so it is 1970 * in-sync with the creation of the target directory entry. 1971 */ 1972 error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp, 1973 ap->a_cred, 0, -1); 1974 if (error == 0 || error == ENOENT) { 1975 error = hammer_ip_add_direntry(&trans, tdip, 1976 tncp->nc_name, tncp->nc_nlen, 1977 ip); 1978 if (error == 0) { 1979 ip->ino_data.parent_obj_id = tdip->obj_id; 1980 ip->ino_data.ctime = trans.time; 1981 hammer_modify_inode(&trans, ip, HAMMER_INODE_DDIRTY); 1982 } 1983 } 1984 if (error) 1985 goto failed; /* XXX */ 1986 1987 /* 1988 * Locate the record in the originating directory and remove it. 1989 * 1990 * Calculate the namekey and setup the key range for the scan. This 1991 * works kinda like a chained hash table where the lower 32 bits 1992 * of the namekey synthesize the chain. 1993 * 1994 * The key range is inclusive of both key_beg and key_end. 1995 */ 1996 namekey = hammer_direntry_namekey(fdip, fncp->nc_name, fncp->nc_nlen, 1997 &max_iterations); 1998 retry: 1999 hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip); 2000 cursor.key_beg.localization = fdip->obj_localization | 2001 hammer_dir_localization(fdip); 2002 cursor.key_beg.obj_id = fdip->obj_id; 2003 cursor.key_beg.key = namekey; 2004 cursor.key_beg.create_tid = 0; 2005 cursor.key_beg.delete_tid = 0; 2006 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 2007 cursor.key_beg.obj_type = 0; 2008 2009 cursor.key_end = cursor.key_beg; 2010 cursor.key_end.key += max_iterations; 2011 cursor.asof = fdip->obj_asof; 2012 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 2013 2014 /* 2015 * Scan all matching records (the chain), locate the one matching 2016 * the requested path component. 2017 * 2018 * The hammer_ip_*() functions merge in-memory records with on-disk 2019 * records for the purposes of the search. 2020 */ 2021 error = hammer_ip_first(&cursor); 2022 while (error == 0) { 2023 if (hammer_ip_resolve_data(&cursor) != 0) 2024 break; 2025 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF; 2026 KKASSERT(nlen > 0); 2027 if (fncp->nc_nlen == nlen && 2028 bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) { 2029 break; 2030 } 2031 error = hammer_ip_next(&cursor); 2032 } 2033 2034 /* 2035 * If all is ok we have to get the inode so we can adjust nlinks. 2036 * 2037 * WARNING: hammer_ip_del_direntry() may have to terminate the 2038 * cursor to avoid a recursion. It's ok to call hammer_done_cursor() 2039 * twice. 2040 */ 2041 if (error == 0) 2042 error = hammer_ip_del_direntry(&trans, &cursor, fdip, ip); 2043 2044 /* 2045 * XXX A deadlock here will break rename's atomicy for the purposes 2046 * of crash recovery. 2047 */ 2048 if (error == EDEADLK) { 2049 hammer_done_cursor(&cursor); 2050 goto retry; 2051 } 2052 2053 /* 2054 * Cleanup and tell the kernel that the rename succeeded. 2055 * 2056 * NOTE: ip->vp, if non-NULL, cannot be directly referenced 2057 * without formally acquiring the vp since the vp might 2058 * have zero refs on it, or in the middle of a reclaim, 2059 * etc. 2060 */ 2061 hammer_done_cursor(&cursor); 2062 if (error == 0) { 2063 cache_rename(ap->a_fnch, ap->a_tnch); 2064 hammer_knote(ap->a_fdvp, NOTE_WRITE); 2065 hammer_knote(ap->a_tdvp, NOTE_WRITE); 2066 while (ip->vp) { 2067 struct vnode *vp; 2068 2069 error = hammer_get_vnode(ip, &vp); 2070 if (error == 0 && vp) { 2071 vn_unlock(vp); 2072 hammer_knote(ip->vp, NOTE_RENAME); 2073 vrele(vp); 2074 break; 2075 } 2076 hdkprintf("ip/vp race2 avoided\n"); 2077 } 2078 } 2079 2080 failed: 2081 hammer_done_transaction(&trans); 2082 lwkt_reltoken(&hmp->fs_token); 2083 return (error); 2084 } 2085 2086 /* 2087 * hammer_vop_nrmdir { nch, dvp, cred } 2088 */ 2089 static 2090 int 2091 hammer_vop_nrmdir(struct vop_nrmdir_args *ap) 2092 { 2093 struct hammer_transaction trans; 2094 struct hammer_inode *dip; 2095 hammer_mount_t hmp; 2096 int error; 2097 2098 dip = VTOI(ap->a_dvp); 2099 hmp = dip->hmp; 2100 2101 if (hammer_nohistory(dip) == 0 && 2102 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 2103 return (error); 2104 } 2105 2106 lwkt_gettoken(&hmp->fs_token); 2107 hammer_start_transaction(&trans, hmp); 2108 ++hammer_stats_file_iopsw; 2109 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 1); 2110 hammer_done_transaction(&trans); 2111 if (error == 0) 2112 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 2113 lwkt_reltoken(&hmp->fs_token); 2114 return (error); 2115 } 2116 2117 /* 2118 * hammer_vop_markatime { vp, cred } 2119 */ 2120 static 2121 int 2122 hammer_vop_markatime(struct vop_markatime_args *ap) 2123 { 2124 struct hammer_transaction trans; 2125 struct hammer_inode *ip; 2126 hammer_mount_t hmp; 2127 2128 ip = VTOI(ap->a_vp); 2129 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 2130 return (EROFS); 2131 if (ip->flags & HAMMER_INODE_RO) 2132 return (EROFS); 2133 hmp = ip->hmp; 2134 if (hmp->mp->mnt_flag & MNT_NOATIME) 2135 return (0); 2136 lwkt_gettoken(&hmp->fs_token); 2137 hammer_start_transaction(&trans, hmp); 2138 ++hammer_stats_file_iopsw; 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 struct hammer_inode *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 ++hammer_stats_file_iopsw; 2187 error = 0; 2188 2189 if (vap->va_flags != VNOVAL) { 2190 flags = ip->ino_data.uflags; 2191 error = vop_helper_setattr_flags(&flags, vap->va_flags, 2192 hammer_to_unix_xid(&ip->ino_data.uid), 2193 ap->a_cred); 2194 if (error == 0) { 2195 if (ip->ino_data.uflags != flags) { 2196 ip->ino_data.uflags = flags; 2197 ip->ino_data.ctime = trans.time; 2198 modflags |= HAMMER_INODE_DDIRTY; 2199 kflags |= NOTE_ATTRIB; 2200 } 2201 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) { 2202 error = 0; 2203 goto done; 2204 } 2205 } 2206 goto done; 2207 } 2208 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) { 2209 error = EPERM; 2210 goto done; 2211 } 2212 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 2213 mode_t cur_mode = ip->ino_data.mode; 2214 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid); 2215 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid); 2216 uuid_t uuid_uid; 2217 uuid_t uuid_gid; 2218 2219 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid, 2220 ap->a_cred, 2221 &cur_uid, &cur_gid, &cur_mode); 2222 if (error == 0) { 2223 hammer_guid_to_uuid(&uuid_uid, cur_uid); 2224 hammer_guid_to_uuid(&uuid_gid, cur_gid); 2225 if (bcmp(&uuid_uid, &ip->ino_data.uid, 2226 sizeof(uuid_uid)) || 2227 bcmp(&uuid_gid, &ip->ino_data.gid, 2228 sizeof(uuid_gid)) || 2229 ip->ino_data.mode != cur_mode) { 2230 ip->ino_data.uid = uuid_uid; 2231 ip->ino_data.gid = uuid_gid; 2232 ip->ino_data.mode = cur_mode; 2233 ip->ino_data.ctime = trans.time; 2234 modflags |= HAMMER_INODE_DDIRTY; 2235 } 2236 kflags |= NOTE_ATTRIB; 2237 } 2238 } 2239 while (vap->va_size != VNOVAL && ip->ino_data.size != vap->va_size) { 2240 switch(ap->a_vp->v_type) { 2241 case VREG: 2242 if (vap->va_size == ip->ino_data.size) 2243 break; 2244 2245 /* 2246 * Log the operation if in fast-fsync mode or if 2247 * there are unterminated redo write records present. 2248 * 2249 * The second check is needed so the recovery code 2250 * properly truncates write redos even if nominal 2251 * REDO operations is turned off due to excessive 2252 * writes, because the related records might be 2253 * destroyed and never lay down a TERM_WRITE. 2254 */ 2255 if ((ip->flags & HAMMER_INODE_REDO) || 2256 (ip->flags & HAMMER_INODE_RDIRTY)) { 2257 error = hammer_generate_redo(&trans, ip, 2258 vap->va_size, 2259 HAMMER_REDO_TRUNC, 2260 NULL, 0); 2261 } 2262 blksize = hammer_blocksize(vap->va_size); 2263 2264 /* 2265 * XXX break atomicy, we can deadlock the backend 2266 * if we do not release the lock. Probably not a 2267 * big deal here. 2268 */ 2269 if (vap->va_size < ip->ino_data.size) { 2270 nvtruncbuf(ap->a_vp, vap->va_size, 2271 blksize, 2272 hammer_blockoff(vap->va_size), 2273 0); 2274 truncating = 1; 2275 kflags |= NOTE_WRITE; 2276 } else { 2277 nvextendbuf(ap->a_vp, 2278 ip->ino_data.size, 2279 vap->va_size, 2280 hammer_blocksize(ip->ino_data.size), 2281 hammer_blocksize(vap->va_size), 2282 hammer_blockoff(ip->ino_data.size), 2283 hammer_blockoff(vap->va_size), 2284 0); 2285 truncating = 0; 2286 kflags |= NOTE_WRITE | NOTE_EXTEND; 2287 } 2288 ip->ino_data.size = vap->va_size; 2289 ip->ino_data.mtime = trans.time; 2290 /* XXX safe to use SDIRTY instead of DDIRTY here? */ 2291 modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY; 2292 2293 /* 2294 * On-media truncation is cached in the inode until 2295 * the inode is synchronized. We must immediately 2296 * handle any frontend records. 2297 */ 2298 if (truncating) { 2299 hammer_ip_frontend_trunc(ip, vap->va_size); 2300 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) { 2301 ip->flags |= HAMMER_INODE_TRUNCATED; 2302 ip->trunc_off = vap->va_size; 2303 hammer_inode_dirty(ip); 2304 } else if (ip->trunc_off > vap->va_size) { 2305 ip->trunc_off = vap->va_size; 2306 } 2307 } 2308 2309 #if 0 2310 /* 2311 * When truncating, nvtruncbuf() may have cleaned out 2312 * a portion of the last block on-disk in the buffer 2313 * cache. We must clean out any frontend records 2314 * for blocks beyond the new last block. 2315 */ 2316 aligned_size = (vap->va_size + (blksize - 1)) & 2317 ~(int64_t)(blksize - 1); 2318 if (truncating && vap->va_size < aligned_size) { 2319 aligned_size -= blksize; 2320 hammer_ip_frontend_trunc(ip, aligned_size); 2321 } 2322 #endif 2323 break; 2324 case VDATABASE: 2325 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) { 2326 ip->flags |= HAMMER_INODE_TRUNCATED; 2327 ip->trunc_off = vap->va_size; 2328 hammer_inode_dirty(ip); 2329 } else if (ip->trunc_off > vap->va_size) { 2330 ip->trunc_off = vap->va_size; 2331 } 2332 hammer_ip_frontend_trunc(ip, vap->va_size); 2333 ip->ino_data.size = vap->va_size; 2334 ip->ino_data.mtime = trans.time; 2335 modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY; 2336 kflags |= NOTE_ATTRIB; 2337 break; 2338 default: 2339 error = EINVAL; 2340 goto done; 2341 } 2342 break; 2343 } 2344 if (vap->va_atime.tv_sec != VNOVAL) { 2345 ip->ino_data.atime = hammer_timespec_to_time(&vap->va_atime); 2346 modflags |= HAMMER_INODE_ATIME; 2347 kflags |= NOTE_ATTRIB; 2348 } 2349 if (vap->va_mtime.tv_sec != VNOVAL) { 2350 ip->ino_data.mtime = hammer_timespec_to_time(&vap->va_mtime); 2351 modflags |= HAMMER_INODE_MTIME; 2352 kflags |= NOTE_ATTRIB; 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 struct hammer_inode *dip; 2386 struct hammer_inode *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 ++hammer_stats_file_iopsw; 2410 2411 /* 2412 * Create a new filesystem object of the requested type. The 2413 * returned inode will be referenced but not locked. 2414 */ 2415 2416 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 2417 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 2418 NULL, &nip); 2419 if (error) { 2420 hammer_done_transaction(&trans); 2421 *ap->a_vpp = NULL; 2422 lwkt_reltoken(&hmp->fs_token); 2423 return (error); 2424 } 2425 2426 /* 2427 * Add a record representing the symlink. symlink stores the link 2428 * as pure data, not a string, and is no \0 terminated. 2429 */ 2430 if (error == 0) { 2431 bytes = strlen(ap->a_target); 2432 2433 if (bytes <= HAMMER_INODE_BASESYMLEN) { 2434 bcopy(ap->a_target, nip->ino_data.ext.symlink, bytes); 2435 } else { 2436 record = hammer_alloc_mem_record(nip, bytes); 2437 record->type = HAMMER_MEM_RECORD_GENERAL; 2438 2439 record->leaf.base.localization = nip->obj_localization | 2440 HAMMER_LOCALIZE_MISC; 2441 record->leaf.base.key = HAMMER_FIXKEY_SYMLINK; 2442 record->leaf.base.rec_type = HAMMER_RECTYPE_FIX; 2443 record->leaf.data_len = bytes; 2444 KKASSERT(HAMMER_SYMLINK_NAME_OFF == 0); 2445 bcopy(ap->a_target, record->data->symlink.name, bytes); 2446 error = hammer_ip_add_record(&trans, record); 2447 } 2448 2449 /* 2450 * Set the file size to the length of the link. 2451 */ 2452 if (error == 0) { 2453 nip->ino_data.size = bytes; 2454 hammer_modify_inode(&trans, nip, HAMMER_INODE_DDIRTY); 2455 } 2456 } 2457 if (error == 0) 2458 error = hammer_ip_add_direntry(&trans, dip, nch->ncp->nc_name, 2459 nch->ncp->nc_nlen, nip); 2460 2461 /* 2462 * Finish up. 2463 */ 2464 if (error) { 2465 hammer_rel_inode(nip, 0); 2466 *ap->a_vpp = NULL; 2467 } else { 2468 error = hammer_get_vnode(nip, ap->a_vpp); 2469 hammer_rel_inode(nip, 0); 2470 if (error == 0) { 2471 cache_setunresolved(ap->a_nch); 2472 cache_setvp(ap->a_nch, *ap->a_vpp); 2473 hammer_knote(ap->a_dvp, NOTE_WRITE); 2474 } 2475 } 2476 hammer_done_transaction(&trans); 2477 lwkt_reltoken(&hmp->fs_token); 2478 return (error); 2479 } 2480 2481 /* 2482 * hammer_vop_nwhiteout { nch, dvp, cred, flags } 2483 */ 2484 static 2485 int 2486 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap) 2487 { 2488 struct hammer_transaction trans; 2489 struct hammer_inode *dip; 2490 hammer_mount_t hmp; 2491 int error; 2492 2493 dip = VTOI(ap->a_dvp); 2494 hmp = dip->hmp; 2495 2496 if (hammer_nohistory(dip) == 0 && 2497 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) { 2498 return (error); 2499 } 2500 2501 lwkt_gettoken(&hmp->fs_token); 2502 hammer_start_transaction(&trans, hmp); 2503 ++hammer_stats_file_iopsw; 2504 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, 2505 ap->a_cred, ap->a_flags, -1); 2506 hammer_done_transaction(&trans); 2507 lwkt_reltoken(&hmp->fs_token); 2508 2509 return (error); 2510 } 2511 2512 /* 2513 * hammer_vop_ioctl { vp, command, data, fflag, cred } 2514 */ 2515 static 2516 int 2517 hammer_vop_ioctl(struct vop_ioctl_args *ap) 2518 { 2519 struct hammer_inode *ip = ap->a_vp->v_data; 2520 hammer_mount_t hmp = ip->hmp; 2521 int error; 2522 2523 ++hammer_stats_file_iopsr; 2524 lwkt_gettoken(&hmp->fs_token); 2525 error = hammer_ioctl(ip, ap->a_command, ap->a_data, 2526 ap->a_fflag, ap->a_cred); 2527 lwkt_reltoken(&hmp->fs_token); 2528 return (error); 2529 } 2530 2531 static 2532 int 2533 hammer_vop_mountctl(struct vop_mountctl_args *ap) 2534 { 2535 static const struct mountctl_opt extraopt[] = { 2536 { HMNT_NOHISTORY, "nohistory" }, 2537 { HMNT_MASTERID, "master" }, 2538 { HMNT_NOMIRROR, "nomirror" }, 2539 { 0, NULL} 2540 2541 }; 2542 struct hammer_mount *hmp; 2543 struct mount *mp; 2544 int usedbytes; 2545 int error; 2546 2547 error = 0; 2548 usedbytes = 0; 2549 mp = ap->a_head.a_ops->head.vv_mount; 2550 KKASSERT(mp->mnt_data != NULL); 2551 hmp = (struct hammer_mount *)mp->mnt_data; 2552 2553 lwkt_gettoken(&hmp->fs_token); 2554 2555 switch(ap->a_op) { 2556 case MOUNTCTL_SET_EXPORT: 2557 if (ap->a_ctllen != sizeof(struct export_args)) 2558 error = EINVAL; 2559 else 2560 error = hammer_vfs_export(mp, ap->a_op, 2561 (const struct export_args *)ap->a_ctl); 2562 break; 2563 case MOUNTCTL_MOUNTFLAGS: 2564 /* 2565 * Call standard mountctl VOP function 2566 * so we get user mount flags. 2567 */ 2568 error = vop_stdmountctl(ap); 2569 if (error) 2570 break; 2571 2572 usedbytes = *ap->a_res; 2573 2574 if (usedbytes > 0 && usedbytes < ap->a_buflen) { 2575 usedbytes += vfs_flagstostr(hmp->hflags, extraopt, 2576 ap->a_buf, 2577 ap->a_buflen - usedbytes, 2578 &error); 2579 } 2580 2581 *ap->a_res += usedbytes; 2582 break; 2583 default: 2584 error = vop_stdmountctl(ap); 2585 break; 2586 } 2587 lwkt_reltoken(&hmp->fs_token); 2588 return(error); 2589 } 2590 2591 /* 2592 * hammer_vop_strategy { vp, bio } 2593 * 2594 * Strategy call, used for regular file read & write only. Note that the 2595 * bp may represent a cluster. 2596 * 2597 * To simplify operation and allow better optimizations in the future, 2598 * this code does not make any assumptions with regards to buffer alignment 2599 * or size. 2600 */ 2601 static 2602 int 2603 hammer_vop_strategy(struct vop_strategy_args *ap) 2604 { 2605 struct buf *bp; 2606 int error; 2607 2608 bp = ap->a_bio->bio_buf; 2609 2610 switch(bp->b_cmd) { 2611 case BUF_CMD_READ: 2612 error = hammer_vop_strategy_read(ap); 2613 break; 2614 case BUF_CMD_WRITE: 2615 error = hammer_vop_strategy_write(ap); 2616 break; 2617 default: 2618 bp->b_error = error = EINVAL; 2619 bp->b_flags |= B_ERROR; 2620 biodone(ap->a_bio); 2621 break; 2622 } 2623 2624 /* hammer_dump_dedup_cache(((hammer_inode_t)ap->a_vp->v_data)->hmp); */ 2625 2626 return (error); 2627 } 2628 2629 /* 2630 * Read from a regular file. Iterate the related records and fill in the 2631 * BIO/BUF. Gaps are zero-filled. 2632 * 2633 * The support code in hammer_object.c should be used to deal with mixed 2634 * in-memory and on-disk records. 2635 * 2636 * NOTE: Can be called from the cluster code with an oversized buf. 2637 * 2638 * XXX atime update 2639 */ 2640 static 2641 int 2642 hammer_vop_strategy_read(struct vop_strategy_args *ap) 2643 { 2644 struct hammer_transaction trans; 2645 struct hammer_inode *ip; 2646 struct hammer_inode *dip; 2647 hammer_mount_t hmp; 2648 struct hammer_cursor cursor; 2649 hammer_base_elm_t base; 2650 hammer_off_t disk_offset; 2651 struct bio *bio; 2652 struct bio *nbio; 2653 struct buf *bp; 2654 int64_t rec_offset; 2655 int64_t ran_end; 2656 int64_t tmp64; 2657 int error; 2658 int boff; 2659 int roff; 2660 int n; 2661 int isdedupable; 2662 2663 bio = ap->a_bio; 2664 bp = bio->bio_buf; 2665 ip = ap->a_vp->v_data; 2666 hmp = ip->hmp; 2667 2668 /* 2669 * The zone-2 disk offset may have been set by the cluster code via 2670 * a BMAP operation, or else should be NOOFFSET. 2671 * 2672 * Checking the high bits for a match against zone-2 should suffice. 2673 * 2674 * In cases where a lot of data duplication is present it may be 2675 * more beneficial to drop through and doubule-buffer through the 2676 * device. 2677 */ 2678 nbio = push_bio(bio); 2679 if (hammer_is_zone_large_data(nbio->bio_offset)) { 2680 if (hammer_double_buffer == 0) { 2681 lwkt_gettoken(&hmp->fs_token); 2682 error = hammer_io_direct_read(hmp, nbio, NULL); 2683 lwkt_reltoken(&hmp->fs_token); 2684 return (error); 2685 } 2686 2687 /* 2688 * Try to shortcut requests for double_buffer mode too. 2689 * Since this mode runs through the device buffer cache 2690 * only compatible buffer sizes (meaning those generated 2691 * by normal filesystem buffers) are legal. 2692 */ 2693 if (hammer_live_dedup == 0 && (bp->b_flags & B_PAGING) == 0) { 2694 lwkt_gettoken(&hmp->fs_token); 2695 error = hammer_io_indirect_read(hmp, nbio, NULL); 2696 lwkt_reltoken(&hmp->fs_token); 2697 return (error); 2698 } 2699 } 2700 2701 /* 2702 * Well, that sucked. Do it the hard way. If all the stars are 2703 * aligned we may still be able to issue a direct-read. 2704 */ 2705 lwkt_gettoken(&hmp->fs_token); 2706 hammer_simple_transaction(&trans, hmp); 2707 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 2708 2709 /* 2710 * Key range (begin and end inclusive) to scan. Note that the key's 2711 * stored in the actual records represent BASE+LEN, not BASE. The 2712 * first record containing bio_offset will have a key > bio_offset. 2713 */ 2714 cursor.key_beg.localization = ip->obj_localization | 2715 HAMMER_LOCALIZE_MISC; 2716 cursor.key_beg.obj_id = ip->obj_id; 2717 cursor.key_beg.create_tid = 0; 2718 cursor.key_beg.delete_tid = 0; 2719 cursor.key_beg.obj_type = 0; 2720 cursor.key_beg.key = bio->bio_offset + 1; 2721 cursor.asof = ip->obj_asof; 2722 cursor.flags |= HAMMER_CURSOR_ASOF; 2723 2724 cursor.key_end = cursor.key_beg; 2725 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE); 2726 #if 0 2727 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) { 2728 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB; 2729 cursor.key_end.rec_type = HAMMER_RECTYPE_DB; 2730 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL; 2731 } else 2732 #endif 2733 { 2734 ran_end = bio->bio_offset + bp->b_bufsize; 2735 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA; 2736 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA; 2737 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */ 2738 if (tmp64 < ran_end) 2739 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL; 2740 else 2741 cursor.key_end.key = ran_end + MAXPHYS + 1; 2742 } 2743 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE; 2744 2745 /* 2746 * Set NOSWAPCACHE for cursor data extraction if double buffering 2747 * is disabled or (if the file is not marked cacheable via chflags 2748 * and vm.swapcache_use_chflags is enabled). 2749 */ 2750 if (hammer_double_buffer == 0 || 2751 ((ap->a_vp->v_flag & VSWAPCACHE) == 0 && 2752 vm_swapcache_use_chflags)) { 2753 cursor.flags |= HAMMER_CURSOR_NOSWAPCACHE; 2754 } 2755 2756 error = hammer_ip_first(&cursor); 2757 boff = 0; 2758 2759 while (error == 0) { 2760 /* 2761 * Get the base file offset of the record. The key for 2762 * data records is (base + bytes) rather then (base). 2763 */ 2764 base = &cursor.leaf->base; 2765 rec_offset = base->key - cursor.leaf->data_len; 2766 2767 /* 2768 * Calculate the gap, if any, and zero-fill it. 2769 * 2770 * n is the offset of the start of the record verses our 2771 * current seek offset in the bio. 2772 */ 2773 n = (int)(rec_offset - (bio->bio_offset + boff)); 2774 if (n > 0) { 2775 if (n > bp->b_bufsize - boff) 2776 n = bp->b_bufsize - boff; 2777 bzero((char *)bp->b_data + boff, n); 2778 boff += n; 2779 n = 0; 2780 } 2781 2782 /* 2783 * Calculate the data offset in the record and the number 2784 * of bytes we can copy. 2785 * 2786 * There are two degenerate cases. First, boff may already 2787 * be at bp->b_bufsize. Secondly, the data offset within 2788 * the record may exceed the record's size. 2789 */ 2790 roff = -n; 2791 rec_offset += roff; 2792 n = cursor.leaf->data_len - roff; 2793 if (n <= 0) { 2794 hdkprintf("bad n=%d roff=%d\n", n, roff); 2795 n = 0; 2796 } else if (n > bp->b_bufsize - boff) { 2797 n = bp->b_bufsize - boff; 2798 } 2799 2800 /* 2801 * Deal with cached truncations. This cool bit of code 2802 * allows truncate()/ftruncate() to avoid having to sync 2803 * the file. 2804 * 2805 * If the frontend is truncated then all backend records are 2806 * subject to the frontend's truncation. 2807 * 2808 * If the backend is truncated then backend records on-disk 2809 * (but not in-memory) are subject to the backend's 2810 * truncation. In-memory records owned by the backend 2811 * represent data written after the truncation point on the 2812 * backend and must not be truncated. 2813 * 2814 * Truncate operations deal with frontend buffer cache 2815 * buffers and frontend-owned in-memory records synchronously. 2816 */ 2817 if (ip->flags & HAMMER_INODE_TRUNCATED) { 2818 if (hammer_cursor_ondisk(&cursor)/* || 2819 cursor.iprec->flush_state == HAMMER_FST_FLUSH*/) { 2820 if (ip->trunc_off <= rec_offset) 2821 n = 0; 2822 else if (ip->trunc_off < rec_offset + n) 2823 n = (int)(ip->trunc_off - rec_offset); 2824 } 2825 } 2826 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 2827 if (hammer_cursor_ondisk(&cursor)) { 2828 if (ip->sync_trunc_off <= rec_offset) 2829 n = 0; 2830 else if (ip->sync_trunc_off < rec_offset + n) 2831 n = (int)(ip->sync_trunc_off - rec_offset); 2832 } 2833 } 2834 2835 /* 2836 * Try to issue a direct read into our bio if possible, 2837 * otherwise resolve the element data into a hammer_buffer 2838 * and copy. 2839 * 2840 * The buffer on-disk should be zerod past any real 2841 * truncation point, but may not be for any synthesized 2842 * truncation point from above. 2843 * 2844 * NOTE: disk_offset is only valid if the cursor data is 2845 * on-disk. 2846 */ 2847 disk_offset = cursor.leaf->data_offset + roff; 2848 isdedupable = (boff == 0 && n == bp->b_bufsize && 2849 hammer_cursor_ondisk(&cursor) && 2850 ((int)disk_offset & HAMMER_BUFMASK) == 0); 2851 2852 if (isdedupable && hammer_double_buffer == 0) { 2853 /* 2854 * Direct read case 2855 */ 2856 KKASSERT(hammer_is_zone_large_data(disk_offset)); 2857 nbio->bio_offset = disk_offset; 2858 error = hammer_io_direct_read(hmp, nbio, cursor.leaf); 2859 if (hammer_live_dedup && error == 0) 2860 hammer_dedup_cache_add(ip, cursor.leaf); 2861 goto done; 2862 } else if (isdedupable) { 2863 /* 2864 * Async I/O case for reading from backing store 2865 * and copying the data to the filesystem buffer. 2866 * live-dedup has to verify the data anyway if it 2867 * gets a hit later so we can just add the entry 2868 * now. 2869 */ 2870 KKASSERT(hammer_is_zone_large_data(disk_offset)); 2871 nbio->bio_offset = disk_offset; 2872 if (hammer_live_dedup) 2873 hammer_dedup_cache_add(ip, cursor.leaf); 2874 error = hammer_io_indirect_read(hmp, nbio, cursor.leaf); 2875 goto done; 2876 } else if (n) { 2877 error = hammer_ip_resolve_data(&cursor); 2878 if (error == 0) { 2879 if (hammer_live_dedup && isdedupable) 2880 hammer_dedup_cache_add(ip, cursor.leaf); 2881 bcopy((char *)cursor.data + roff, 2882 (char *)bp->b_data + boff, n); 2883 } 2884 } 2885 if (error) 2886 break; 2887 2888 /* 2889 * We have to be sure that the only elements added to the 2890 * dedup cache are those which are already on-media. 2891 */ 2892 if (hammer_live_dedup && hammer_cursor_ondisk(&cursor)) 2893 hammer_dedup_cache_add(ip, cursor.leaf); 2894 2895 /* 2896 * Iterate until we have filled the request. 2897 */ 2898 boff += n; 2899 if (boff == bp->b_bufsize) 2900 break; 2901 error = hammer_ip_next(&cursor); 2902 } 2903 2904 /* 2905 * There may have been a gap after the last record 2906 */ 2907 if (error == ENOENT) 2908 error = 0; 2909 if (error == 0 && boff != bp->b_bufsize) { 2910 KKASSERT(boff < bp->b_bufsize); 2911 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff); 2912 /* boff = bp->b_bufsize; */ 2913 } 2914 2915 /* 2916 * Disallow swapcache operation on the vnode buffer if double 2917 * buffering is enabled, the swapcache will get the data via 2918 * the block device buffer. 2919 */ 2920 if (hammer_double_buffer) 2921 bp->b_flags |= B_NOTMETA; 2922 2923 /* 2924 * Cleanup 2925 */ 2926 bp->b_resid = 0; 2927 bp->b_error = error; 2928 if (error) 2929 bp->b_flags |= B_ERROR; 2930 biodone(ap->a_bio); 2931 2932 done: 2933 /* 2934 * Cache the b-tree node for the last data read in cache[1]. 2935 * 2936 * If we hit the file EOF then also cache the node in the 2937 * governing directory's cache[3], it will be used to initialize 2938 * the new inode's cache[1] for any inodes looked up via the directory. 2939 * 2940 * This doesn't reduce disk accesses since the B-Tree chain is 2941 * likely cached, but it does reduce cpu overhead when looking 2942 * up file offsets for cpdup/tar/cpio style iterations. 2943 */ 2944 if (cursor.node) 2945 hammer_cache_node(&ip->cache[1], cursor.node); 2946 if (ran_end >= ip->ino_data.size) { 2947 dip = hammer_find_inode(&trans, ip->ino_data.parent_obj_id, 2948 ip->obj_asof, ip->obj_localization); 2949 if (dip) { 2950 hammer_cache_node(&dip->cache[3], cursor.node); 2951 hammer_rel_inode(dip, 0); 2952 } 2953 } 2954 hammer_done_cursor(&cursor); 2955 hammer_done_transaction(&trans); 2956 lwkt_reltoken(&hmp->fs_token); 2957 return(error); 2958 } 2959 2960 /* 2961 * BMAP operation - used to support cluster_read() only. 2962 * 2963 * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb) 2964 * 2965 * This routine may return EOPNOTSUPP if the opration is not supported for 2966 * the specified offset. The contents of the pointer arguments do not 2967 * need to be initialized in that case. 2968 * 2969 * If a disk address is available and properly aligned return 0 with 2970 * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately 2971 * to the run-length relative to that offset. Callers may assume that 2972 * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently 2973 * large, so return EOPNOTSUPP if it is not sufficiently large. 2974 */ 2975 static 2976 int 2977 hammer_vop_bmap(struct vop_bmap_args *ap) 2978 { 2979 struct hammer_transaction trans; 2980 struct hammer_inode *ip; 2981 hammer_mount_t hmp; 2982 struct hammer_cursor cursor; 2983 hammer_base_elm_t base; 2984 int64_t rec_offset; 2985 int64_t ran_end; 2986 int64_t tmp64; 2987 int64_t base_offset; 2988 int64_t base_disk_offset; 2989 int64_t last_offset; 2990 hammer_off_t last_disk_offset; 2991 hammer_off_t disk_offset; 2992 int rec_len; 2993 int error; 2994 int blksize; 2995 2996 ++hammer_stats_file_iopsr; 2997 ip = ap->a_vp->v_data; 2998 hmp = ip->hmp; 2999 3000 /* 3001 * We can only BMAP regular files. We can't BMAP database files, 3002 * directories, etc. 3003 */ 3004 if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE) 3005 return(EOPNOTSUPP); 3006 3007 /* 3008 * bmap is typically called with runp/runb both NULL when used 3009 * for writing. We do not support BMAP for writing atm. 3010 */ 3011 if (ap->a_cmd != BUF_CMD_READ) 3012 return(EOPNOTSUPP); 3013 3014 /* 3015 * Scan the B-Tree to acquire blockmap addresses, then translate 3016 * to raw addresses. 3017 */ 3018 lwkt_gettoken(&hmp->fs_token); 3019 hammer_simple_transaction(&trans, hmp); 3020 3021 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 3022 3023 /* 3024 * Key range (begin and end inclusive) to scan. Note that the key's 3025 * stored in the actual records represent BASE+LEN, not BASE. The 3026 * first record containing bio_offset will have a key > bio_offset. 3027 */ 3028 cursor.key_beg.localization = ip->obj_localization | 3029 HAMMER_LOCALIZE_MISC; 3030 cursor.key_beg.obj_id = ip->obj_id; 3031 cursor.key_beg.create_tid = 0; 3032 cursor.key_beg.delete_tid = 0; 3033 cursor.key_beg.obj_type = 0; 3034 if (ap->a_runb) 3035 cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1; 3036 else 3037 cursor.key_beg.key = ap->a_loffset + 1; 3038 if (cursor.key_beg.key < 0) 3039 cursor.key_beg.key = 0; 3040 cursor.asof = ip->obj_asof; 3041 cursor.flags |= HAMMER_CURSOR_ASOF; 3042 3043 cursor.key_end = cursor.key_beg; 3044 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE); 3045 3046 ran_end = ap->a_loffset + MAXPHYS; 3047 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA; 3048 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA; 3049 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */ 3050 if (tmp64 < ran_end) 3051 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL; 3052 else 3053 cursor.key_end.key = ran_end + MAXPHYS + 1; 3054 3055 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE; 3056 3057 error = hammer_ip_first(&cursor); 3058 base_offset = last_offset = 0; 3059 base_disk_offset = last_disk_offset = 0; 3060 3061 while (error == 0) { 3062 /* 3063 * Get the base file offset of the record. The key for 3064 * data records is (base + bytes) rather then (base). 3065 * 3066 * NOTE: rec_offset + rec_len may exceed the end-of-file. 3067 * The extra bytes should be zero on-disk and the BMAP op 3068 * should still be ok. 3069 */ 3070 base = &cursor.leaf->base; 3071 rec_offset = base->key - cursor.leaf->data_len; 3072 rec_len = cursor.leaf->data_len; 3073 3074 /* 3075 * Incorporate any cached truncation. 3076 * 3077 * NOTE: Modifications to rec_len based on synthesized 3078 * truncation points remove the guarantee that any extended 3079 * data on disk is zero (since the truncations may not have 3080 * taken place on-media yet). 3081 */ 3082 if (ip->flags & HAMMER_INODE_TRUNCATED) { 3083 if (hammer_cursor_ondisk(&cursor) || 3084 cursor.iprec->flush_state == HAMMER_FST_FLUSH) { 3085 if (ip->trunc_off <= rec_offset) 3086 rec_len = 0; 3087 else if (ip->trunc_off < rec_offset + rec_len) 3088 rec_len = (int)(ip->trunc_off - rec_offset); 3089 } 3090 } 3091 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 3092 if (hammer_cursor_ondisk(&cursor)) { 3093 if (ip->sync_trunc_off <= rec_offset) 3094 rec_len = 0; 3095 else if (ip->sync_trunc_off < rec_offset + rec_len) 3096 rec_len = (int)(ip->sync_trunc_off - rec_offset); 3097 } 3098 } 3099 3100 /* 3101 * Accumulate information. If we have hit a discontiguous 3102 * block reset base_offset unless we are already beyond the 3103 * requested offset. If we are, that's it, we stop. 3104 */ 3105 if (error) 3106 break; 3107 if (hammer_cursor_ondisk(&cursor)) { 3108 disk_offset = cursor.leaf->data_offset; 3109 if (rec_offset != last_offset || 3110 disk_offset != last_disk_offset) { 3111 if (rec_offset > ap->a_loffset) 3112 break; 3113 base_offset = rec_offset; 3114 base_disk_offset = disk_offset; 3115 } 3116 last_offset = rec_offset + rec_len; 3117 last_disk_offset = disk_offset + rec_len; 3118 3119 if (hammer_live_dedup) 3120 hammer_dedup_cache_add(ip, cursor.leaf); 3121 } 3122 3123 error = hammer_ip_next(&cursor); 3124 } 3125 3126 if (cursor.node) 3127 hammer_cache_node(&ip->cache[1], cursor.node); 3128 3129 hammer_done_cursor(&cursor); 3130 hammer_done_transaction(&trans); 3131 lwkt_reltoken(&hmp->fs_token); 3132 3133 /* 3134 * If we couldn't find any records or the records we did find were 3135 * all behind the requested offset, return failure. A forward 3136 * truncation can leave a hole w/ no on-disk records. 3137 */ 3138 if (last_offset == 0 || last_offset < ap->a_loffset) 3139 return (EOPNOTSUPP); 3140 3141 /* 3142 * Figure out the block size at the requested offset and adjust 3143 * our limits so the cluster_read() does not create inappropriately 3144 * sized buffer cache buffers. 3145 */ 3146 blksize = hammer_blocksize(ap->a_loffset); 3147 if (hammer_blocksize(base_offset) != blksize) { 3148 base_offset = hammer_blockdemarc(base_offset, ap->a_loffset); 3149 } 3150 if (last_offset != ap->a_loffset && 3151 hammer_blocksize(last_offset - 1) != blksize) { 3152 last_offset = hammer_blockdemarc(ap->a_loffset, 3153 last_offset - 1); 3154 } 3155 3156 /* 3157 * Returning EOPNOTSUPP simply prevents the direct-IO optimization 3158 * from occuring. 3159 */ 3160 disk_offset = base_disk_offset + (ap->a_loffset - base_offset); 3161 3162 if (!hammer_is_zone_large_data(disk_offset)) { 3163 /* 3164 * Only large-data zones can be direct-IOd 3165 */ 3166 error = EOPNOTSUPP; 3167 } else if ((disk_offset & HAMMER_BUFMASK) || 3168 (last_offset - ap->a_loffset) < blksize) { 3169 /* 3170 * doffsetp is not aligned or the forward run size does 3171 * not cover a whole buffer, disallow the direct I/O. 3172 */ 3173 error = EOPNOTSUPP; 3174 } else { 3175 /* 3176 * We're good. 3177 */ 3178 *ap->a_doffsetp = disk_offset; 3179 if (ap->a_runb) { 3180 *ap->a_runb = ap->a_loffset - base_offset; 3181 KKASSERT(*ap->a_runb >= 0); 3182 } 3183 if (ap->a_runp) { 3184 *ap->a_runp = last_offset - ap->a_loffset; 3185 KKASSERT(*ap->a_runp >= 0); 3186 } 3187 error = 0; 3188 } 3189 return(error); 3190 } 3191 3192 /* 3193 * Write to a regular file. Because this is a strategy call the OS is 3194 * trying to actually get data onto the media. 3195 */ 3196 static 3197 int 3198 hammer_vop_strategy_write(struct vop_strategy_args *ap) 3199 { 3200 hammer_record_t record; 3201 hammer_mount_t hmp; 3202 hammer_inode_t ip; 3203 struct bio *bio; 3204 struct buf *bp; 3205 int blksize __debugvar; 3206 int bytes; 3207 int error; 3208 3209 bio = ap->a_bio; 3210 bp = bio->bio_buf; 3211 ip = ap->a_vp->v_data; 3212 hmp = ip->hmp; 3213 3214 blksize = hammer_blocksize(bio->bio_offset); 3215 KKASSERT(bp->b_bufsize == blksize); 3216 3217 if (ip->flags & HAMMER_INODE_RO) { 3218 bp->b_error = EROFS; 3219 bp->b_flags |= B_ERROR; 3220 biodone(ap->a_bio); 3221 return(EROFS); 3222 } 3223 3224 lwkt_gettoken(&hmp->fs_token); 3225 3226 /* 3227 * Disallow swapcache operation on the vnode buffer if double 3228 * buffering is enabled, the swapcache will get the data via 3229 * the block device buffer. 3230 */ 3231 if (hammer_double_buffer) 3232 bp->b_flags |= B_NOTMETA; 3233 3234 /* 3235 * Interlock with inode destruction (no in-kernel or directory 3236 * topology visibility). If we queue new IO while trying to 3237 * destroy the inode we can deadlock the vtrunc call in 3238 * hammer_inode_unloadable_check(). 3239 * 3240 * Besides, there's no point flushing a bp associated with an 3241 * inode that is being destroyed on-media and has no kernel 3242 * references. 3243 */ 3244 if ((ip->flags | ip->sync_flags) & 3245 (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) { 3246 bp->b_resid = 0; 3247 biodone(ap->a_bio); 3248 lwkt_reltoken(&hmp->fs_token); 3249 return(0); 3250 } 3251 3252 /* 3253 * Reserve space and issue a direct-write from the front-end. 3254 * NOTE: The direct_io code will hammer_bread/bcopy smaller 3255 * allocations. 3256 * 3257 * An in-memory record will be installed to reference the storage 3258 * until the flusher can get to it. 3259 * 3260 * Since we own the high level bio the front-end will not try to 3261 * do a direct-read until the write completes. 3262 * 3263 * NOTE: The only time we do not reserve a full-sized buffers 3264 * worth of data is if the file is small. We do not try to 3265 * allocate a fragment (from the small-data zone) at the end of 3266 * an otherwise large file as this can lead to wildly separated 3267 * data. 3268 */ 3269 KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0); 3270 KKASSERT(bio->bio_offset < ip->ino_data.size); 3271 if (bio->bio_offset || ip->ino_data.size > HAMMER_HBUFSIZE) 3272 bytes = bp->b_bufsize; 3273 else 3274 bytes = ((int)ip->ino_data.size + 15) & ~15; 3275 3276 record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data, 3277 bytes, &error); 3278 3279 /* 3280 * B_VFSFLAG1 indicates that a REDO_WRITE entry was generated 3281 * in hammer_vop_write(). We must flag the record so the proper 3282 * REDO_TERM_WRITE entry is generated during the flush. 3283 */ 3284 if (record) { 3285 if (bp->b_flags & B_VFSFLAG1) { 3286 record->flags |= HAMMER_RECF_REDO; 3287 bp->b_flags &= ~B_VFSFLAG1; 3288 } 3289 if (record->flags & HAMMER_RECF_DEDUPED) { 3290 bp->b_resid = 0; 3291 hammer_ip_replace_bulk(hmp, record); 3292 biodone(ap->a_bio); 3293 } else { 3294 hammer_io_direct_write(hmp, bio, record); 3295 } 3296 if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs) 3297 hammer_flush_inode(ip, 0); 3298 } else { 3299 bp->b_bio2.bio_offset = NOOFFSET; 3300 bp->b_error = error; 3301 bp->b_flags |= B_ERROR; 3302 biodone(ap->a_bio); 3303 } 3304 lwkt_reltoken(&hmp->fs_token); 3305 return(error); 3306 } 3307 3308 /* 3309 * dounlink - disconnect a directory entry 3310 * 3311 * XXX whiteout support not really in yet 3312 */ 3313 static int 3314 hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch, 3315 struct vnode *dvp, struct ucred *cred, 3316 int flags, int isdir) 3317 { 3318 struct namecache *ncp; 3319 hammer_inode_t dip; 3320 hammer_inode_t ip; 3321 hammer_mount_t hmp; 3322 struct hammer_cursor cursor; 3323 int64_t namekey; 3324 uint32_t max_iterations; 3325 int nlen, error; 3326 3327 /* 3328 * Calculate the namekey and setup the key range for the scan. This 3329 * works kinda like a chained hash table where the lower 32 bits 3330 * of the namekey synthesize the chain. 3331 * 3332 * The key range is inclusive of both key_beg and key_end. 3333 */ 3334 dip = VTOI(dvp); 3335 ncp = nch->ncp; 3336 hmp = dip->hmp; 3337 3338 if (dip->flags & HAMMER_INODE_RO) 3339 return (EROFS); 3340 3341 namekey = hammer_direntry_namekey(dip, ncp->nc_name, ncp->nc_nlen, 3342 &max_iterations); 3343 retry: 3344 hammer_init_cursor(trans, &cursor, &dip->cache[1], dip); 3345 cursor.key_beg.localization = dip->obj_localization | 3346 hammer_dir_localization(dip); 3347 cursor.key_beg.obj_id = dip->obj_id; 3348 cursor.key_beg.key = namekey; 3349 cursor.key_beg.create_tid = 0; 3350 cursor.key_beg.delete_tid = 0; 3351 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 3352 cursor.key_beg.obj_type = 0; 3353 3354 cursor.key_end = cursor.key_beg; 3355 cursor.key_end.key += max_iterations; 3356 cursor.asof = dip->obj_asof; 3357 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 3358 3359 /* 3360 * Scan all matching records (the chain), locate the one matching 3361 * the requested path component. info->last_error contains the 3362 * error code on search termination and could be 0, ENOENT, or 3363 * something else. 3364 * 3365 * The hammer_ip_*() functions merge in-memory records with on-disk 3366 * records for the purposes of the search. 3367 */ 3368 error = hammer_ip_first(&cursor); 3369 3370 while (error == 0) { 3371 error = hammer_ip_resolve_data(&cursor); 3372 if (error) 3373 break; 3374 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF; 3375 KKASSERT(nlen > 0); 3376 if (ncp->nc_nlen == nlen && 3377 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) { 3378 break; 3379 } 3380 error = hammer_ip_next(&cursor); 3381 } 3382 3383 /* 3384 * If all is ok we have to get the inode so we can adjust nlinks. 3385 * To avoid a deadlock with the flusher we must release the inode 3386 * lock on the directory when acquiring the inode for the entry. 3387 * 3388 * If the target is a directory, it must be empty. 3389 */ 3390 if (error == 0) { 3391 hammer_unlock(&cursor.ip->lock); 3392 ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id, 3393 hmp->asof, 3394 cursor.data->entry.localization, 3395 0, &error); 3396 hammer_lock_sh(&cursor.ip->lock); 3397 if (error == ENOENT) { 3398 hkprintf("WARNING: Removing dirent w/missing inode " 3399 "\"%s\"\n" 3400 "\tobj_id = %016jx\n", 3401 ncp->nc_name, 3402 (intmax_t)cursor.data->entry.obj_id); 3403 error = 0; 3404 } 3405 3406 /* 3407 * If isdir >= 0 we validate that the entry is or is not a 3408 * directory. If isdir < 0 we don't care. 3409 */ 3410 if (error == 0 && isdir >= 0 && ip) { 3411 if (isdir && 3412 ip->ino_data.obj_type != HAMMER_OBJTYPE_DIRECTORY) { 3413 error = ENOTDIR; 3414 } else if (isdir == 0 && 3415 ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY) { 3416 error = EISDIR; 3417 } 3418 } 3419 3420 /* 3421 * If we are trying to remove a directory the directory must 3422 * be empty. 3423 * 3424 * The check directory code can loop and deadlock/retry. Our 3425 * own cursor's node locks must be released to avoid a 3-way 3426 * deadlock with the flusher if the check directory code 3427 * blocks. 3428 * 3429 * If any changes whatsoever have been made to the cursor 3430 * set EDEADLK and retry. 3431 * 3432 * WARNING: See warnings in hammer_unlock_cursor() 3433 * function. 3434 */ 3435 if (error == 0 && ip && ip->ino_data.obj_type == 3436 HAMMER_OBJTYPE_DIRECTORY) { 3437 hammer_unlock_cursor(&cursor); 3438 error = hammer_ip_check_directory_empty(trans, ip); 3439 hammer_lock_cursor(&cursor); 3440 if (cursor.flags & HAMMER_CURSOR_RETEST) { 3441 hkprintf("Warning: avoided deadlock " 3442 "on rmdir '%s'\n", 3443 ncp->nc_name); 3444 error = EDEADLK; 3445 } 3446 } 3447 3448 /* 3449 * Delete the directory entry. 3450 * 3451 * WARNING: hammer_ip_del_direntry() may have to terminate 3452 * the cursor to avoid a deadlock. It is ok to call 3453 * hammer_done_cursor() twice. 3454 */ 3455 if (error == 0) { 3456 error = hammer_ip_del_direntry(trans, &cursor, 3457 dip, ip); 3458 } 3459 hammer_done_cursor(&cursor); 3460 if (error == 0) { 3461 /* 3462 * Tell the namecache that we are now unlinked. 3463 */ 3464 cache_unlink(nch); 3465 3466 /* 3467 * NOTE: ip->vp, if non-NULL, cannot be directly 3468 * referenced without formally acquiring the 3469 * vp since the vp might have zero refs on it, 3470 * or in the middle of a reclaim, etc. 3471 * 3472 * NOTE: The cache_setunresolved() can rip the vp 3473 * out from under us since the vp may not have 3474 * any refs, in which case ip->vp will be NULL 3475 * from the outset. 3476 */ 3477 while (ip && ip->vp) { 3478 struct vnode *vp; 3479 3480 error = hammer_get_vnode(ip, &vp); 3481 if (error == 0 && vp) { 3482 vn_unlock(vp); 3483 hammer_knote(ip->vp, NOTE_DELETE); 3484 #if 0 3485 /* 3486 * Don't do this, it can deadlock 3487 * on concurrent rm's of hardlinks. 3488 * Shouldn't be needed any more. 3489 */ 3490 cache_inval_vp(ip->vp, CINV_DESTROY); 3491 #endif 3492 vrele(vp); 3493 break; 3494 } 3495 hdkprintf("ip/vp race1 avoided\n"); 3496 } 3497 } 3498 if (ip) 3499 hammer_rel_inode(ip, 0); 3500 } else { 3501 hammer_done_cursor(&cursor); 3502 } 3503 if (error == EDEADLK) 3504 goto retry; 3505 3506 return (error); 3507 } 3508 3509 /************************************************************************ 3510 * FIFO AND SPECFS OPS * 3511 ************************************************************************ 3512 * 3513 */ 3514 static int 3515 hammer_vop_fifoclose (struct vop_close_args *ap) 3516 { 3517 /* XXX update itimes */ 3518 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3519 } 3520 3521 static int 3522 hammer_vop_fiforead (struct vop_read_args *ap) 3523 { 3524 int error; 3525 3526 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 3527 /* XXX update access time */ 3528 return (error); 3529 } 3530 3531 static int 3532 hammer_vop_fifowrite (struct vop_write_args *ap) 3533 { 3534 int error; 3535 3536 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 3537 /* XXX update access time */ 3538 return (error); 3539 } 3540 3541 static 3542 int 3543 hammer_vop_fifokqfilter(struct vop_kqfilter_args *ap) 3544 { 3545 int error; 3546 3547 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 3548 if (error) 3549 error = hammer_vop_kqfilter(ap); 3550 return(error); 3551 } 3552 3553 /************************************************************************ 3554 * KQFILTER OPS * 3555 ************************************************************************ 3556 * 3557 */ 3558 static void filt_hammerdetach(struct knote *kn); 3559 static int filt_hammerread(struct knote *kn, long hint); 3560 static int filt_hammerwrite(struct knote *kn, long hint); 3561 static int filt_hammervnode(struct knote *kn, long hint); 3562 3563 static struct filterops hammerread_filtops = 3564 { FILTEROP_ISFD | FILTEROP_MPSAFE, 3565 NULL, filt_hammerdetach, filt_hammerread }; 3566 static struct filterops hammerwrite_filtops = 3567 { FILTEROP_ISFD | FILTEROP_MPSAFE, 3568 NULL, filt_hammerdetach, filt_hammerwrite }; 3569 static struct filterops hammervnode_filtops = 3570 { FILTEROP_ISFD | FILTEROP_MPSAFE, 3571 NULL, filt_hammerdetach, filt_hammervnode }; 3572 3573 static 3574 int 3575 hammer_vop_kqfilter(struct vop_kqfilter_args *ap) 3576 { 3577 struct vnode *vp = ap->a_vp; 3578 struct knote *kn = ap->a_kn; 3579 3580 switch (kn->kn_filter) { 3581 case EVFILT_READ: 3582 kn->kn_fop = &hammerread_filtops; 3583 break; 3584 case EVFILT_WRITE: 3585 kn->kn_fop = &hammerwrite_filtops; 3586 break; 3587 case EVFILT_VNODE: 3588 kn->kn_fop = &hammervnode_filtops; 3589 break; 3590 default: 3591 return (EOPNOTSUPP); 3592 } 3593 3594 kn->kn_hook = (caddr_t)vp; 3595 3596 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 3597 3598 return(0); 3599 } 3600 3601 static void 3602 filt_hammerdetach(struct knote *kn) 3603 { 3604 struct vnode *vp = (void *)kn->kn_hook; 3605 3606 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 3607 } 3608 3609 static int 3610 filt_hammerread(struct knote *kn, long hint) 3611 { 3612 struct vnode *vp = (void *)kn->kn_hook; 3613 hammer_inode_t ip = VTOI(vp); 3614 hammer_mount_t hmp = ip->hmp; 3615 off_t off; 3616 3617 if (hint == NOTE_REVOKE) { 3618 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 3619 return(1); 3620 } 3621 lwkt_gettoken(&hmp->fs_token); /* XXX use per-ip-token */ 3622 off = ip->ino_data.size - kn->kn_fp->f_offset; 3623 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 3624 lwkt_reltoken(&hmp->fs_token); 3625 if (kn->kn_sfflags & NOTE_OLDAPI) 3626 return(1); 3627 return (kn->kn_data != 0); 3628 } 3629 3630 static int 3631 filt_hammerwrite(struct knote *kn, long hint) 3632 { 3633 if (hint == NOTE_REVOKE) 3634 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 3635 kn->kn_data = 0; 3636 return (1); 3637 } 3638 3639 static int 3640 filt_hammervnode(struct knote *kn, long hint) 3641 { 3642 if (kn->kn_sfflags & hint) 3643 kn->kn_fflags |= hint; 3644 if (hint == NOTE_REVOKE) { 3645 kn->kn_flags |= (EV_EOF | EV_NODATA); 3646 return (1); 3647 } 3648 return (kn->kn_fflags != 0); 3649 } 3650 3651