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_directory(&trans, dip, 950 nch->ncp->nc_name, nch->ncp->nc_nlen, 951 nip); 952 if (error) 953 hkprintf("hammer_ip_add_directory 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 (ip->pfsm->pfsd.mirror_flags & HAMMER_PFSD_SLAVE) 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_directory_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 = %016llx, asof=%016llx, lo=%08x\n", 1260 ncp->nc_name, 1261 (long long)obj_id, (long long)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 does not necessarily indicate that we are 1295 * at the root, instead it could indicate that the directory we were in was 1296 * removed. 1297 * 1298 * NOTE: as-of sequences are not linked into the directory structure. If 1299 * we are at the root with a different asof then the mount point, reload 1300 * the same directory with the mount point's asof. I'm not sure what this 1301 * will do to NFS. We encode ASOF stamps in NFS file handles so it might not 1302 * get confused, but it hasn't been tested. 1303 */ 1304 static 1305 int 1306 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap) 1307 { 1308 struct hammer_transaction trans; 1309 struct hammer_inode *dip; 1310 struct hammer_inode *ip; 1311 hammer_mount_t hmp; 1312 int64_t parent_obj_id; 1313 uint32_t parent_obj_localization; 1314 hammer_tid_t asof; 1315 int error; 1316 1317 dip = VTOI(ap->a_dvp); 1318 asof = dip->obj_asof; 1319 hmp = dip->hmp; 1320 1321 /* 1322 * Whos are parent? This could be the root of a pseudo-filesystem 1323 * whos parent is in another localization domain. 1324 */ 1325 lwkt_gettoken(&hmp->fs_token); 1326 parent_obj_id = dip->ino_data.parent_obj_id; 1327 if (dip->obj_id == HAMMER_OBJID_ROOT) 1328 parent_obj_localization = HAMMER_DEF_LOCALIZATION; 1329 else 1330 parent_obj_localization = dip->obj_localization; 1331 1332 /* 1333 * It's probably a PFS root when dip->ino_data.parent_obj_id is 0. 1334 */ 1335 if (parent_obj_id == 0) { 1336 if (dip->obj_id == HAMMER_OBJID_ROOT && 1337 asof != hmp->asof) { 1338 parent_obj_id = dip->obj_id; 1339 asof = hmp->asof; 1340 *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK); 1341 ksnprintf(*ap->a_fakename, 19, "0x%016llx", 1342 (long long)dip->obj_asof); 1343 } else { 1344 *ap->a_vpp = NULL; 1345 lwkt_reltoken(&hmp->fs_token); 1346 return ENOENT; 1347 } 1348 } 1349 1350 hammer_simple_transaction(&trans, hmp); 1351 ++hammer_stats_file_iopsr; 1352 1353 ip = hammer_get_inode(&trans, dip, parent_obj_id, 1354 asof, parent_obj_localization, 1355 dip->flags, &error); 1356 if (ip) { 1357 error = hammer_get_vnode(ip, ap->a_vpp); 1358 hammer_rel_inode(ip, 0); 1359 } else { 1360 *ap->a_vpp = NULL; 1361 } 1362 hammer_done_transaction(&trans); 1363 lwkt_reltoken(&hmp->fs_token); 1364 return (error); 1365 } 1366 1367 /* 1368 * hammer_vop_nlink { nch, dvp, vp, cred } 1369 */ 1370 static 1371 int 1372 hammer_vop_nlink(struct vop_nlink_args *ap) 1373 { 1374 struct hammer_transaction trans; 1375 struct hammer_inode *dip; 1376 struct hammer_inode *ip; 1377 struct nchandle *nch; 1378 hammer_mount_t hmp; 1379 int error; 1380 1381 if (ap->a_dvp->v_mount != ap->a_vp->v_mount) 1382 return(EXDEV); 1383 1384 nch = ap->a_nch; 1385 dip = VTOI(ap->a_dvp); 1386 ip = VTOI(ap->a_vp); 1387 hmp = dip->hmp; 1388 1389 if (dip->obj_localization != ip->obj_localization) 1390 return(EXDEV); 1391 1392 if (dip->flags & HAMMER_INODE_RO) 1393 return (EROFS); 1394 if (ip->flags & HAMMER_INODE_RO) 1395 return (EROFS); 1396 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1397 return (error); 1398 1399 /* 1400 * Create a transaction to cover the operations we perform. 1401 */ 1402 lwkt_gettoken(&hmp->fs_token); 1403 hammer_start_transaction(&trans, hmp); 1404 ++hammer_stats_file_iopsw; 1405 1406 /* 1407 * Add the filesystem object to the directory. Note that neither 1408 * dip nor ip are referenced or locked, but their vnodes are 1409 * referenced. This function will bump the inode's link count. 1410 */ 1411 error = hammer_ip_add_directory(&trans, dip, 1412 nch->ncp->nc_name, nch->ncp->nc_nlen, 1413 ip); 1414 1415 /* 1416 * Finish up. 1417 */ 1418 if (error == 0) { 1419 cache_setunresolved(nch); 1420 cache_setvp(nch, ap->a_vp); 1421 } 1422 hammer_done_transaction(&trans); 1423 hammer_knote(ap->a_vp, NOTE_LINK); 1424 hammer_knote(ap->a_dvp, NOTE_WRITE); 1425 lwkt_reltoken(&hmp->fs_token); 1426 return (error); 1427 } 1428 1429 /* 1430 * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap } 1431 * 1432 * The operating system has already ensured that the directory entry 1433 * does not exist and done all appropriate namespace locking. 1434 */ 1435 static 1436 int 1437 hammer_vop_nmkdir(struct vop_nmkdir_args *ap) 1438 { 1439 struct hammer_transaction trans; 1440 struct hammer_inode *dip; 1441 struct hammer_inode *nip; 1442 struct nchandle *nch; 1443 hammer_mount_t hmp; 1444 int error; 1445 1446 nch = ap->a_nch; 1447 dip = VTOI(ap->a_dvp); 1448 hmp = dip->hmp; 1449 1450 if (dip->flags & HAMMER_INODE_RO) 1451 return (EROFS); 1452 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1453 return (error); 1454 1455 /* 1456 * Create a transaction to cover the operations we perform. 1457 */ 1458 lwkt_gettoken(&hmp->fs_token); 1459 hammer_start_transaction(&trans, hmp); 1460 ++hammer_stats_file_iopsw; 1461 1462 /* 1463 * Create a new filesystem object of the requested type. The 1464 * returned inode will be referenced but not locked. 1465 */ 1466 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 1467 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 1468 NULL, &nip); 1469 if (error) { 1470 hammer_done_transaction(&trans); 1471 *ap->a_vpp = NULL; 1472 lwkt_reltoken(&hmp->fs_token); 1473 return (error); 1474 } 1475 /* 1476 * Add the new filesystem object to the directory. This will also 1477 * bump the inode's link count. 1478 */ 1479 error = hammer_ip_add_directory(&trans, dip, 1480 nch->ncp->nc_name, nch->ncp->nc_nlen, 1481 nip); 1482 if (error) 1483 hkprintf("hammer_mkdir (add) error %d\n", error); 1484 1485 /* 1486 * Finish up. 1487 */ 1488 if (error) { 1489 hammer_rel_inode(nip, 0); 1490 *ap->a_vpp = NULL; 1491 } else { 1492 error = hammer_get_vnode(nip, ap->a_vpp); 1493 hammer_rel_inode(nip, 0); 1494 if (error == 0) { 1495 cache_setunresolved(ap->a_nch); 1496 cache_setvp(ap->a_nch, *ap->a_vpp); 1497 } 1498 } 1499 hammer_done_transaction(&trans); 1500 if (error == 0) 1501 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1502 lwkt_reltoken(&hmp->fs_token); 1503 return (error); 1504 } 1505 1506 /* 1507 * hammer_vop_nmknod { nch, dvp, vpp, cred, vap } 1508 * 1509 * The operating system has already ensured that the directory entry 1510 * does not exist and done all appropriate namespace locking. 1511 */ 1512 static 1513 int 1514 hammer_vop_nmknod(struct vop_nmknod_args *ap) 1515 { 1516 struct hammer_transaction trans; 1517 struct hammer_inode *dip; 1518 struct hammer_inode *nip; 1519 struct nchandle *nch; 1520 hammer_mount_t hmp; 1521 int error; 1522 1523 nch = ap->a_nch; 1524 dip = VTOI(ap->a_dvp); 1525 hmp = dip->hmp; 1526 1527 if (dip->flags & HAMMER_INODE_RO) 1528 return (EROFS); 1529 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1530 return (error); 1531 1532 /* 1533 * Create a transaction to cover the operations we perform. 1534 */ 1535 lwkt_gettoken(&hmp->fs_token); 1536 hammer_start_transaction(&trans, hmp); 1537 ++hammer_stats_file_iopsw; 1538 1539 /* 1540 * Create a new filesystem object of the requested type. The 1541 * returned inode will be referenced but not locked. 1542 * 1543 * If mknod specifies a directory a pseudo-fs is created. 1544 */ 1545 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 1546 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 1547 NULL, &nip); 1548 if (error) { 1549 hammer_done_transaction(&trans); 1550 *ap->a_vpp = NULL; 1551 lwkt_reltoken(&hmp->fs_token); 1552 return (error); 1553 } 1554 1555 /* 1556 * Add the new filesystem object to the directory. This will also 1557 * bump the inode's link count. 1558 */ 1559 error = hammer_ip_add_directory(&trans, dip, 1560 nch->ncp->nc_name, nch->ncp->nc_nlen, 1561 nip); 1562 1563 /* 1564 * Finish up. 1565 */ 1566 if (error) { 1567 hammer_rel_inode(nip, 0); 1568 *ap->a_vpp = NULL; 1569 } else { 1570 error = hammer_get_vnode(nip, ap->a_vpp); 1571 hammer_rel_inode(nip, 0); 1572 if (error == 0) { 1573 cache_setunresolved(ap->a_nch); 1574 cache_setvp(ap->a_nch, *ap->a_vpp); 1575 } 1576 } 1577 hammer_done_transaction(&trans); 1578 if (error == 0) 1579 hammer_knote(ap->a_dvp, NOTE_WRITE); 1580 lwkt_reltoken(&hmp->fs_token); 1581 return (error); 1582 } 1583 1584 /* 1585 * hammer_vop_open { vp, mode, cred, fp } 1586 * 1587 * MPSAFE (does not require fs_token) 1588 */ 1589 static 1590 int 1591 hammer_vop_open(struct vop_open_args *ap) 1592 { 1593 hammer_inode_t ip; 1594 1595 ++hammer_stats_file_iopsr; 1596 ip = VTOI(ap->a_vp); 1597 1598 if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO)) 1599 return (EROFS); 1600 return(vop_stdopen(ap)); 1601 } 1602 1603 /* 1604 * hammer_vop_print { vp } 1605 */ 1606 static 1607 int 1608 hammer_vop_print(struct vop_print_args *ap) 1609 { 1610 return EOPNOTSUPP; 1611 } 1612 1613 /* 1614 * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies } 1615 */ 1616 static 1617 int 1618 hammer_vop_readdir(struct vop_readdir_args *ap) 1619 { 1620 struct hammer_transaction trans; 1621 struct hammer_cursor cursor; 1622 struct hammer_inode *ip; 1623 hammer_mount_t hmp; 1624 struct uio *uio; 1625 hammer_base_elm_t base; 1626 int error; 1627 int cookie_index; 1628 int ncookies; 1629 off_t *cookies; 1630 off_t saveoff; 1631 int r; 1632 int dtype; 1633 1634 ++hammer_stats_file_iopsr; 1635 ip = VTOI(ap->a_vp); 1636 uio = ap->a_uio; 1637 saveoff = uio->uio_offset; 1638 hmp = ip->hmp; 1639 1640 if (ap->a_ncookies) { 1641 ncookies = uio->uio_resid / 16 + 1; 1642 if (ncookies > 1024) 1643 ncookies = 1024; 1644 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 1645 cookie_index = 0; 1646 } else { 1647 ncookies = -1; 1648 cookies = NULL; 1649 cookie_index = 0; 1650 } 1651 1652 lwkt_gettoken(&hmp->fs_token); 1653 hammer_simple_transaction(&trans, hmp); 1654 1655 /* 1656 * Handle artificial entries 1657 * 1658 * It should be noted that the minimum value for a directory 1659 * hash key on-media is 0x0000000100000000, so we can use anything 1660 * less then that to represent our 'special' key space. 1661 */ 1662 error = 0; 1663 if (saveoff == 0) { 1664 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, "."); 1665 if (r) 1666 goto done; 1667 if (cookies) 1668 cookies[cookie_index] = saveoff; 1669 ++saveoff; 1670 ++cookie_index; 1671 if (cookie_index == ncookies) 1672 goto done; 1673 } 1674 if (saveoff == 1) { 1675 if (ip->ino_data.parent_obj_id) { 1676 r = vop_write_dirent(&error, uio, 1677 ip->ino_data.parent_obj_id, 1678 DT_DIR, 2, ".."); 1679 } else { 1680 r = vop_write_dirent(&error, uio, 1681 ip->obj_id, DT_DIR, 2, ".."); 1682 } 1683 if (r) 1684 goto done; 1685 if (cookies) 1686 cookies[cookie_index] = saveoff; 1687 ++saveoff; 1688 ++cookie_index; 1689 if (cookie_index == ncookies) 1690 goto done; 1691 } 1692 1693 /* 1694 * Key range (begin and end inclusive) to scan. Directory keys 1695 * directly translate to a 64 bit 'seek' position. 1696 */ 1697 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 1698 cursor.key_beg.localization = ip->obj_localization | 1699 hammer_dir_localization(ip); 1700 cursor.key_beg.obj_id = ip->obj_id; 1701 cursor.key_beg.create_tid = 0; 1702 cursor.key_beg.delete_tid = 0; 1703 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 1704 cursor.key_beg.obj_type = 0; 1705 cursor.key_beg.key = saveoff; 1706 1707 cursor.key_end = cursor.key_beg; 1708 cursor.key_end.key = HAMMER_MAX_KEY; 1709 cursor.asof = ip->obj_asof; 1710 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 1711 1712 error = hammer_ip_first(&cursor); 1713 1714 while (error == 0) { 1715 error = hammer_ip_resolve_data(&cursor); 1716 if (error) 1717 break; 1718 base = &cursor.leaf->base; 1719 saveoff = base->key; 1720 KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF); 1721 1722 if (base->obj_id != ip->obj_id) 1723 hpanic("bad record at %p", cursor.node); 1724 1725 /* 1726 * Convert pseudo-filesystems into softlinks 1727 */ 1728 dtype = hammer_get_dtype(cursor.leaf->base.obj_type); 1729 r = vop_write_dirent( 1730 &error, uio, cursor.data->entry.obj_id, 1731 dtype, 1732 cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF , 1733 (void *)cursor.data->entry.name); 1734 if (r) 1735 break; 1736 ++saveoff; 1737 if (cookies) 1738 cookies[cookie_index] = base->key; 1739 ++cookie_index; 1740 if (cookie_index == ncookies) 1741 break; 1742 error = hammer_ip_next(&cursor); 1743 } 1744 hammer_done_cursor(&cursor); 1745 1746 done: 1747 hammer_done_transaction(&trans); 1748 1749 if (ap->a_eofflag) 1750 *ap->a_eofflag = (error == ENOENT); 1751 uio->uio_offset = saveoff; 1752 if (error && cookie_index == 0) { 1753 if (error == ENOENT) 1754 error = 0; 1755 if (cookies) { 1756 kfree(cookies, M_TEMP); 1757 *ap->a_ncookies = 0; 1758 *ap->a_cookies = NULL; 1759 } 1760 } else { 1761 if (error == ENOENT) 1762 error = 0; 1763 if (cookies) { 1764 *ap->a_ncookies = cookie_index; 1765 *ap->a_cookies = cookies; 1766 } 1767 } 1768 lwkt_reltoken(&hmp->fs_token); 1769 return(error); 1770 } 1771 1772 /* 1773 * hammer_vop_readlink { vp, uio, cred } 1774 */ 1775 static 1776 int 1777 hammer_vop_readlink(struct vop_readlink_args *ap) 1778 { 1779 struct hammer_transaction trans; 1780 struct hammer_cursor cursor; 1781 struct hammer_inode *ip; 1782 hammer_mount_t hmp; 1783 char buf[32]; 1784 uint32_t localization; 1785 hammer_pseudofs_inmem_t pfsm; 1786 int error; 1787 1788 ip = VTOI(ap->a_vp); 1789 hmp = ip->hmp; 1790 1791 lwkt_gettoken(&hmp->fs_token); 1792 1793 /* 1794 * Shortcut if the symlink data was stuffed into ino_data. 1795 * 1796 * Also expand special "@@PFS%05d" softlinks (expansion only 1797 * occurs for non-historical (current) accesses made from the 1798 * primary filesystem). 1799 * 1800 * Note that userspace hammer command does not allow users to 1801 * create a @@PFS softlink under an existing other PFS (id!=0) 1802 * so the ip localization here for @@PFS softlink is always 0. 1803 */ 1804 if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) { 1805 char *ptr; 1806 int bytes; 1807 1808 ptr = ip->ino_data.ext.symlink; 1809 bytes = (int)ip->ino_data.size; 1810 if (bytes == 10 && 1811 ip->obj_asof == HAMMER_MAX_TID && 1812 ip->obj_localization == HAMMER_DEF_LOCALIZATION && 1813 strncmp(ptr, "@@PFS", 5) == 0) { 1814 hammer_simple_transaction(&trans, hmp); 1815 bcopy(ptr + 5, buf, 5); 1816 buf[5] = 0; 1817 localization = pfs_to_lo(strtoul(buf, NULL, 10)); 1818 pfsm = hammer_load_pseudofs(&trans, localization, 1819 &error); 1820 if (error == 0) { 1821 if (pfsm->pfsd.mirror_flags & 1822 HAMMER_PFSD_SLAVE) { 1823 /* vap->va_size == 26 */ 1824 ksnprintf(buf, sizeof(buf), 1825 "@@0x%016llx:%05d", 1826 (long long)pfsm->pfsd.sync_end_tid, 1827 lo_to_pfs(localization)); 1828 } else { 1829 /* vap->va_size == 10 */ 1830 ksnprintf(buf, sizeof(buf), 1831 "@@-1:%05d", 1832 lo_to_pfs(localization)); 1833 } 1834 ptr = buf; 1835 bytes = strlen(buf); 1836 } 1837 if (pfsm) 1838 hammer_rel_pseudofs(hmp, pfsm); 1839 hammer_done_transaction(&trans); 1840 } 1841 error = uiomove(ptr, bytes, ap->a_uio); 1842 lwkt_reltoken(&hmp->fs_token); 1843 return(error); 1844 } 1845 1846 /* 1847 * Long version 1848 */ 1849 hammer_simple_transaction(&trans, hmp); 1850 ++hammer_stats_file_iopsr; 1851 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 1852 1853 /* 1854 * Key range (begin and end inclusive) to scan. Directory keys 1855 * directly translate to a 64 bit 'seek' position. 1856 */ 1857 cursor.key_beg.localization = ip->obj_localization | 1858 HAMMER_LOCALIZE_MISC; 1859 cursor.key_beg.obj_id = ip->obj_id; 1860 cursor.key_beg.create_tid = 0; 1861 cursor.key_beg.delete_tid = 0; 1862 cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX; 1863 cursor.key_beg.obj_type = 0; 1864 cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK; 1865 cursor.asof = ip->obj_asof; 1866 cursor.flags |= HAMMER_CURSOR_ASOF; 1867 1868 error = hammer_ip_lookup(&cursor); 1869 if (error == 0) { 1870 error = hammer_ip_resolve_data(&cursor); 1871 if (error == 0) { 1872 KKASSERT(cursor.leaf->data_len >= 1873 HAMMER_SYMLINK_NAME_OFF); 1874 error = uiomove(cursor.data->symlink.name, 1875 cursor.leaf->data_len - 1876 HAMMER_SYMLINK_NAME_OFF, 1877 ap->a_uio); 1878 } 1879 } 1880 hammer_done_cursor(&cursor); 1881 hammer_done_transaction(&trans); 1882 lwkt_reltoken(&hmp->fs_token); 1883 return(error); 1884 } 1885 1886 /* 1887 * hammer_vop_nremove { nch, dvp, cred } 1888 */ 1889 static 1890 int 1891 hammer_vop_nremove(struct vop_nremove_args *ap) 1892 { 1893 struct hammer_transaction trans; 1894 struct hammer_inode *dip; 1895 hammer_mount_t hmp; 1896 int error; 1897 1898 dip = VTOI(ap->a_dvp); 1899 hmp = dip->hmp; 1900 1901 if (hammer_nohistory(dip) == 0 && 1902 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 1903 return (error); 1904 } 1905 1906 lwkt_gettoken(&hmp->fs_token); 1907 hammer_start_transaction(&trans, hmp); 1908 ++hammer_stats_file_iopsw; 1909 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 0); 1910 hammer_done_transaction(&trans); 1911 if (error == 0) 1912 hammer_knote(ap->a_dvp, NOTE_WRITE); 1913 lwkt_reltoken(&hmp->fs_token); 1914 return (error); 1915 } 1916 1917 /* 1918 * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred } 1919 */ 1920 static 1921 int 1922 hammer_vop_nrename(struct vop_nrename_args *ap) 1923 { 1924 struct hammer_transaction trans; 1925 struct namecache *fncp; 1926 struct namecache *tncp; 1927 struct hammer_inode *fdip; 1928 struct hammer_inode *tdip; 1929 struct hammer_inode *ip; 1930 hammer_mount_t hmp; 1931 struct hammer_cursor cursor; 1932 int64_t namekey; 1933 uint32_t max_iterations; 1934 int nlen, error; 1935 1936 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount) 1937 return(EXDEV); 1938 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount) 1939 return(EXDEV); 1940 1941 fdip = VTOI(ap->a_fdvp); 1942 tdip = VTOI(ap->a_tdvp); 1943 fncp = ap->a_fnch->ncp; 1944 tncp = ap->a_tnch->ncp; 1945 ip = VTOI(fncp->nc_vp); 1946 KKASSERT(ip != NULL); 1947 1948 hmp = ip->hmp; 1949 1950 if (fdip->obj_localization != tdip->obj_localization) 1951 return(EXDEV); 1952 if (fdip->obj_localization != ip->obj_localization) 1953 return(EXDEV); 1954 1955 if (fdip->flags & HAMMER_INODE_RO) 1956 return (EROFS); 1957 if (tdip->flags & HAMMER_INODE_RO) 1958 return (EROFS); 1959 if (ip->flags & HAMMER_INODE_RO) 1960 return (EROFS); 1961 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1962 return (error); 1963 1964 lwkt_gettoken(&hmp->fs_token); 1965 hammer_start_transaction(&trans, hmp); 1966 ++hammer_stats_file_iopsw; 1967 1968 /* 1969 * Remove tncp from the target directory and then link ip as 1970 * tncp. XXX pass trans to dounlink 1971 * 1972 * Force the inode sync-time to match the transaction so it is 1973 * in-sync with the creation of the target directory entry. 1974 */ 1975 error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp, 1976 ap->a_cred, 0, -1); 1977 if (error == 0 || error == ENOENT) { 1978 error = hammer_ip_add_directory(&trans, tdip, 1979 tncp->nc_name, tncp->nc_nlen, 1980 ip); 1981 if (error == 0) { 1982 ip->ino_data.parent_obj_id = tdip->obj_id; 1983 ip->ino_data.ctime = trans.time; 1984 hammer_modify_inode(&trans, ip, HAMMER_INODE_DDIRTY); 1985 } 1986 } 1987 if (error) 1988 goto failed; /* XXX */ 1989 1990 /* 1991 * Locate the record in the originating directory and remove it. 1992 * 1993 * Calculate the namekey and setup the key range for the scan. This 1994 * works kinda like a chained hash table where the lower 32 bits 1995 * of the namekey synthesize the chain. 1996 * 1997 * The key range is inclusive of both key_beg and key_end. 1998 */ 1999 namekey = hammer_directory_namekey(fdip, fncp->nc_name, fncp->nc_nlen, 2000 &max_iterations); 2001 retry: 2002 hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip); 2003 cursor.key_beg.localization = fdip->obj_localization | 2004 hammer_dir_localization(fdip); 2005 cursor.key_beg.obj_id = fdip->obj_id; 2006 cursor.key_beg.key = namekey; 2007 cursor.key_beg.create_tid = 0; 2008 cursor.key_beg.delete_tid = 0; 2009 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 2010 cursor.key_beg.obj_type = 0; 2011 2012 cursor.key_end = cursor.key_beg; 2013 cursor.key_end.key += max_iterations; 2014 cursor.asof = fdip->obj_asof; 2015 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 2016 2017 /* 2018 * Scan all matching records (the chain), locate the one matching 2019 * the requested path component. 2020 * 2021 * The hammer_ip_*() functions merge in-memory records with on-disk 2022 * records for the purposes of the search. 2023 */ 2024 error = hammer_ip_first(&cursor); 2025 while (error == 0) { 2026 if (hammer_ip_resolve_data(&cursor) != 0) 2027 break; 2028 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF; 2029 KKASSERT(nlen > 0); 2030 if (fncp->nc_nlen == nlen && 2031 bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) { 2032 break; 2033 } 2034 error = hammer_ip_next(&cursor); 2035 } 2036 2037 /* 2038 * If all is ok we have to get the inode so we can adjust nlinks. 2039 * 2040 * WARNING: hammer_ip_del_directory() may have to terminate the 2041 * cursor to avoid a recursion. It's ok to call hammer_done_cursor() 2042 * twice. 2043 */ 2044 if (error == 0) 2045 error = hammer_ip_del_directory(&trans, &cursor, fdip, ip); 2046 2047 /* 2048 * XXX A deadlock here will break rename's atomicy for the purposes 2049 * of crash recovery. 2050 */ 2051 if (error == EDEADLK) { 2052 hammer_done_cursor(&cursor); 2053 goto retry; 2054 } 2055 2056 /* 2057 * Cleanup and tell the kernel that the rename succeeded. 2058 * 2059 * NOTE: ip->vp, if non-NULL, cannot be directly referenced 2060 * without formally acquiring the vp since the vp might 2061 * have zero refs on it, or in the middle of a reclaim, 2062 * etc. 2063 */ 2064 hammer_done_cursor(&cursor); 2065 if (error == 0) { 2066 cache_rename(ap->a_fnch, ap->a_tnch); 2067 hammer_knote(ap->a_fdvp, NOTE_WRITE); 2068 hammer_knote(ap->a_tdvp, NOTE_WRITE); 2069 while (ip->vp) { 2070 struct vnode *vp; 2071 2072 error = hammer_get_vnode(ip, &vp); 2073 if (error == 0 && vp) { 2074 vn_unlock(vp); 2075 hammer_knote(ip->vp, NOTE_RENAME); 2076 vrele(vp); 2077 break; 2078 } 2079 hdkprintf("ip/vp race2 avoided\n"); 2080 } 2081 } 2082 2083 failed: 2084 hammer_done_transaction(&trans); 2085 lwkt_reltoken(&hmp->fs_token); 2086 return (error); 2087 } 2088 2089 /* 2090 * hammer_vop_nrmdir { nch, dvp, cred } 2091 */ 2092 static 2093 int 2094 hammer_vop_nrmdir(struct vop_nrmdir_args *ap) 2095 { 2096 struct hammer_transaction trans; 2097 struct hammer_inode *dip; 2098 hammer_mount_t hmp; 2099 int error; 2100 2101 dip = VTOI(ap->a_dvp); 2102 hmp = dip->hmp; 2103 2104 if (hammer_nohistory(dip) == 0 && 2105 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 2106 return (error); 2107 } 2108 2109 lwkt_gettoken(&hmp->fs_token); 2110 hammer_start_transaction(&trans, hmp); 2111 ++hammer_stats_file_iopsw; 2112 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 1); 2113 hammer_done_transaction(&trans); 2114 if (error == 0) 2115 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 2116 lwkt_reltoken(&hmp->fs_token); 2117 return (error); 2118 } 2119 2120 /* 2121 * hammer_vop_markatime { vp, cred } 2122 */ 2123 static 2124 int 2125 hammer_vop_markatime(struct vop_markatime_args *ap) 2126 { 2127 struct hammer_transaction trans; 2128 struct hammer_inode *ip; 2129 hammer_mount_t hmp; 2130 2131 ip = VTOI(ap->a_vp); 2132 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 2133 return (EROFS); 2134 if (ip->flags & HAMMER_INODE_RO) 2135 return (EROFS); 2136 hmp = ip->hmp; 2137 if (hmp->mp->mnt_flag & MNT_NOATIME) 2138 return (0); 2139 lwkt_gettoken(&hmp->fs_token); 2140 hammer_start_transaction(&trans, hmp); 2141 ++hammer_stats_file_iopsw; 2142 2143 ip->ino_data.atime = trans.time; 2144 hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME); 2145 hammer_done_transaction(&trans); 2146 hammer_knote(ap->a_vp, NOTE_ATTRIB); 2147 lwkt_reltoken(&hmp->fs_token); 2148 return (0); 2149 } 2150 2151 /* 2152 * hammer_vop_setattr { vp, vap, cred } 2153 */ 2154 static 2155 int 2156 hammer_vop_setattr(struct vop_setattr_args *ap) 2157 { 2158 struct hammer_transaction trans; 2159 struct hammer_inode *ip; 2160 struct vattr *vap; 2161 hammer_mount_t hmp; 2162 int modflags; 2163 int error; 2164 int truncating; 2165 int blksize; 2166 int kflags; 2167 #if 0 2168 int64_t aligned_size; 2169 #endif 2170 uint32_t flags; 2171 2172 vap = ap->a_vap; 2173 ip = ap->a_vp->v_data; 2174 modflags = 0; 2175 kflags = 0; 2176 hmp = ip->hmp; 2177 2178 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 2179 return(EROFS); 2180 if (ip->flags & HAMMER_INODE_RO) 2181 return (EROFS); 2182 if (hammer_nohistory(ip) == 0 && 2183 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 2184 return (error); 2185 } 2186 2187 lwkt_gettoken(&hmp->fs_token); 2188 hammer_start_transaction(&trans, hmp); 2189 ++hammer_stats_file_iopsw; 2190 error = 0; 2191 2192 if (vap->va_flags != VNOVAL) { 2193 flags = ip->ino_data.uflags; 2194 error = vop_helper_setattr_flags(&flags, vap->va_flags, 2195 hammer_to_unix_xid(&ip->ino_data.uid), 2196 ap->a_cred); 2197 if (error == 0) { 2198 if (ip->ino_data.uflags != flags) { 2199 ip->ino_data.uflags = flags; 2200 ip->ino_data.ctime = trans.time; 2201 modflags |= HAMMER_INODE_DDIRTY; 2202 kflags |= NOTE_ATTRIB; 2203 } 2204 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) { 2205 error = 0; 2206 goto done; 2207 } 2208 } 2209 goto done; 2210 } 2211 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) { 2212 error = EPERM; 2213 goto done; 2214 } 2215 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 2216 mode_t cur_mode = ip->ino_data.mode; 2217 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid); 2218 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid); 2219 uuid_t uuid_uid; 2220 uuid_t uuid_gid; 2221 2222 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid, 2223 ap->a_cred, 2224 &cur_uid, &cur_gid, &cur_mode); 2225 if (error == 0) { 2226 hammer_guid_to_uuid(&uuid_uid, cur_uid); 2227 hammer_guid_to_uuid(&uuid_gid, cur_gid); 2228 if (bcmp(&uuid_uid, &ip->ino_data.uid, 2229 sizeof(uuid_uid)) || 2230 bcmp(&uuid_gid, &ip->ino_data.gid, 2231 sizeof(uuid_gid)) || 2232 ip->ino_data.mode != cur_mode) { 2233 ip->ino_data.uid = uuid_uid; 2234 ip->ino_data.gid = uuid_gid; 2235 ip->ino_data.mode = cur_mode; 2236 ip->ino_data.ctime = trans.time; 2237 modflags |= HAMMER_INODE_DDIRTY; 2238 } 2239 kflags |= NOTE_ATTRIB; 2240 } 2241 } 2242 while (vap->va_size != VNOVAL && ip->ino_data.size != vap->va_size) { 2243 switch(ap->a_vp->v_type) { 2244 case VREG: 2245 if (vap->va_size == ip->ino_data.size) 2246 break; 2247 2248 /* 2249 * Log the operation if in fast-fsync mode or if 2250 * there are unterminated redo write records present. 2251 * 2252 * The second check is needed so the recovery code 2253 * properly truncates write redos even if nominal 2254 * REDO operations is turned off due to excessive 2255 * writes, because the related records might be 2256 * destroyed and never lay down a TERM_WRITE. 2257 */ 2258 if ((ip->flags & HAMMER_INODE_REDO) || 2259 (ip->flags & HAMMER_INODE_RDIRTY)) { 2260 error = hammer_generate_redo(&trans, ip, 2261 vap->va_size, 2262 HAMMER_REDO_TRUNC, 2263 NULL, 0); 2264 } 2265 blksize = hammer_blocksize(vap->va_size); 2266 2267 /* 2268 * XXX break atomicy, we can deadlock the backend 2269 * if we do not release the lock. Probably not a 2270 * big deal here. 2271 */ 2272 if (vap->va_size < ip->ino_data.size) { 2273 nvtruncbuf(ap->a_vp, vap->va_size, 2274 blksize, 2275 hammer_blockoff(vap->va_size), 2276 0); 2277 truncating = 1; 2278 kflags |= NOTE_WRITE; 2279 } else { 2280 nvextendbuf(ap->a_vp, 2281 ip->ino_data.size, 2282 vap->va_size, 2283 hammer_blocksize(ip->ino_data.size), 2284 hammer_blocksize(vap->va_size), 2285 hammer_blockoff(ip->ino_data.size), 2286 hammer_blockoff(vap->va_size), 2287 0); 2288 truncating = 0; 2289 kflags |= NOTE_WRITE | NOTE_EXTEND; 2290 } 2291 ip->ino_data.size = vap->va_size; 2292 ip->ino_data.mtime = trans.time; 2293 /* XXX safe to use SDIRTY instead of DDIRTY here? */ 2294 modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY; 2295 2296 /* 2297 * On-media truncation is cached in the inode until 2298 * the inode is synchronized. We must immediately 2299 * handle any frontend records. 2300 */ 2301 if (truncating) { 2302 hammer_ip_frontend_trunc(ip, vap->va_size); 2303 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) { 2304 ip->flags |= HAMMER_INODE_TRUNCATED; 2305 ip->trunc_off = vap->va_size; 2306 hammer_inode_dirty(ip); 2307 } else if (ip->trunc_off > vap->va_size) { 2308 ip->trunc_off = vap->va_size; 2309 } 2310 } 2311 2312 #if 0 2313 /* 2314 * When truncating, nvtruncbuf() may have cleaned out 2315 * a portion of the last block on-disk in the buffer 2316 * cache. We must clean out any frontend records 2317 * for blocks beyond the new last block. 2318 */ 2319 aligned_size = (vap->va_size + (blksize - 1)) & 2320 ~(int64_t)(blksize - 1); 2321 if (truncating && vap->va_size < aligned_size) { 2322 aligned_size -= blksize; 2323 hammer_ip_frontend_trunc(ip, aligned_size); 2324 } 2325 #endif 2326 break; 2327 case VDATABASE: 2328 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) { 2329 ip->flags |= HAMMER_INODE_TRUNCATED; 2330 ip->trunc_off = vap->va_size; 2331 hammer_inode_dirty(ip); 2332 } else if (ip->trunc_off > vap->va_size) { 2333 ip->trunc_off = vap->va_size; 2334 } 2335 hammer_ip_frontend_trunc(ip, vap->va_size); 2336 ip->ino_data.size = vap->va_size; 2337 ip->ino_data.mtime = trans.time; 2338 modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY; 2339 kflags |= NOTE_ATTRIB; 2340 break; 2341 default: 2342 error = EINVAL; 2343 goto done; 2344 } 2345 break; 2346 } 2347 if (vap->va_atime.tv_sec != VNOVAL) { 2348 ip->ino_data.atime = hammer_timespec_to_time(&vap->va_atime); 2349 modflags |= HAMMER_INODE_ATIME; 2350 kflags |= NOTE_ATTRIB; 2351 } 2352 if (vap->va_mtime.tv_sec != VNOVAL) { 2353 ip->ino_data.mtime = hammer_timespec_to_time(&vap->va_mtime); 2354 modflags |= HAMMER_INODE_MTIME; 2355 kflags |= NOTE_ATTRIB; 2356 } 2357 if (vap->va_mode != (mode_t)VNOVAL) { 2358 mode_t cur_mode = ip->ino_data.mode; 2359 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid); 2360 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid); 2361 2362 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred, 2363 cur_uid, cur_gid, &cur_mode); 2364 if (error == 0 && ip->ino_data.mode != cur_mode) { 2365 ip->ino_data.mode = cur_mode; 2366 ip->ino_data.ctime = trans.time; 2367 modflags |= HAMMER_INODE_DDIRTY; 2368 kflags |= NOTE_ATTRIB; 2369 } 2370 } 2371 done: 2372 if (error == 0) 2373 hammer_modify_inode(&trans, ip, modflags); 2374 hammer_done_transaction(&trans); 2375 hammer_knote(ap->a_vp, kflags); 2376 lwkt_reltoken(&hmp->fs_token); 2377 return (error); 2378 } 2379 2380 /* 2381 * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target } 2382 */ 2383 static 2384 int 2385 hammer_vop_nsymlink(struct vop_nsymlink_args *ap) 2386 { 2387 struct hammer_transaction trans; 2388 struct hammer_inode *dip; 2389 struct hammer_inode *nip; 2390 hammer_record_t record; 2391 struct nchandle *nch; 2392 hammer_mount_t hmp; 2393 int error; 2394 int bytes; 2395 2396 ap->a_vap->va_type = VLNK; 2397 2398 nch = ap->a_nch; 2399 dip = VTOI(ap->a_dvp); 2400 hmp = dip->hmp; 2401 2402 if (dip->flags & HAMMER_INODE_RO) 2403 return (EROFS); 2404 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 2405 return (error); 2406 2407 /* 2408 * Create a transaction to cover the operations we perform. 2409 */ 2410 lwkt_gettoken(&hmp->fs_token); 2411 hammer_start_transaction(&trans, hmp); 2412 ++hammer_stats_file_iopsw; 2413 2414 /* 2415 * Create a new filesystem object of the requested type. The 2416 * returned inode will be referenced but not locked. 2417 */ 2418 2419 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 2420 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 2421 NULL, &nip); 2422 if (error) { 2423 hammer_done_transaction(&trans); 2424 *ap->a_vpp = NULL; 2425 lwkt_reltoken(&hmp->fs_token); 2426 return (error); 2427 } 2428 2429 /* 2430 * Add a record representing the symlink. symlink stores the link 2431 * as pure data, not a string, and is no \0 terminated. 2432 */ 2433 if (error == 0) { 2434 bytes = strlen(ap->a_target); 2435 2436 if (bytes <= HAMMER_INODE_BASESYMLEN) { 2437 bcopy(ap->a_target, nip->ino_data.ext.symlink, bytes); 2438 } else { 2439 record = hammer_alloc_mem_record(nip, bytes); 2440 record->type = HAMMER_MEM_RECORD_GENERAL; 2441 2442 record->leaf.base.localization = nip->obj_localization | 2443 HAMMER_LOCALIZE_MISC; 2444 record->leaf.base.key = HAMMER_FIXKEY_SYMLINK; 2445 record->leaf.base.rec_type = HAMMER_RECTYPE_FIX; 2446 record->leaf.data_len = bytes; 2447 KKASSERT(HAMMER_SYMLINK_NAME_OFF == 0); 2448 bcopy(ap->a_target, record->data->symlink.name, bytes); 2449 error = hammer_ip_add_record(&trans, record); 2450 } 2451 2452 /* 2453 * Set the file size to the length of the link. 2454 */ 2455 if (error == 0) { 2456 nip->ino_data.size = bytes; 2457 hammer_modify_inode(&trans, nip, HAMMER_INODE_DDIRTY); 2458 } 2459 } 2460 if (error == 0) 2461 error = hammer_ip_add_directory(&trans, dip, nch->ncp->nc_name, 2462 nch->ncp->nc_nlen, nip); 2463 2464 /* 2465 * Finish up. 2466 */ 2467 if (error) { 2468 hammer_rel_inode(nip, 0); 2469 *ap->a_vpp = NULL; 2470 } else { 2471 error = hammer_get_vnode(nip, ap->a_vpp); 2472 hammer_rel_inode(nip, 0); 2473 if (error == 0) { 2474 cache_setunresolved(ap->a_nch); 2475 cache_setvp(ap->a_nch, *ap->a_vpp); 2476 hammer_knote(ap->a_dvp, NOTE_WRITE); 2477 } 2478 } 2479 hammer_done_transaction(&trans); 2480 lwkt_reltoken(&hmp->fs_token); 2481 return (error); 2482 } 2483 2484 /* 2485 * hammer_vop_nwhiteout { nch, dvp, cred, flags } 2486 */ 2487 static 2488 int 2489 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap) 2490 { 2491 struct hammer_transaction trans; 2492 struct hammer_inode *dip; 2493 hammer_mount_t hmp; 2494 int error; 2495 2496 dip = VTOI(ap->a_dvp); 2497 hmp = dip->hmp; 2498 2499 if (hammer_nohistory(dip) == 0 && 2500 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) { 2501 return (error); 2502 } 2503 2504 lwkt_gettoken(&hmp->fs_token); 2505 hammer_start_transaction(&trans, hmp); 2506 ++hammer_stats_file_iopsw; 2507 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, 2508 ap->a_cred, ap->a_flags, -1); 2509 hammer_done_transaction(&trans); 2510 lwkt_reltoken(&hmp->fs_token); 2511 2512 return (error); 2513 } 2514 2515 /* 2516 * hammer_vop_ioctl { vp, command, data, fflag, cred } 2517 */ 2518 static 2519 int 2520 hammer_vop_ioctl(struct vop_ioctl_args *ap) 2521 { 2522 struct hammer_inode *ip = ap->a_vp->v_data; 2523 hammer_mount_t hmp = ip->hmp; 2524 int error; 2525 2526 ++hammer_stats_file_iopsr; 2527 lwkt_gettoken(&hmp->fs_token); 2528 error = hammer_ioctl(ip, ap->a_command, ap->a_data, 2529 ap->a_fflag, ap->a_cred); 2530 lwkt_reltoken(&hmp->fs_token); 2531 return (error); 2532 } 2533 2534 static 2535 int 2536 hammer_vop_mountctl(struct vop_mountctl_args *ap) 2537 { 2538 static const struct mountctl_opt extraopt[] = { 2539 { HMNT_NOHISTORY, "nohistory" }, 2540 { HMNT_MASTERID, "master" }, 2541 { HMNT_NOMIRROR, "nomirror" }, 2542 { 0, NULL} 2543 2544 }; 2545 struct hammer_mount *hmp; 2546 struct mount *mp; 2547 int usedbytes; 2548 int error; 2549 2550 error = 0; 2551 usedbytes = 0; 2552 mp = ap->a_head.a_ops->head.vv_mount; 2553 KKASSERT(mp->mnt_data != NULL); 2554 hmp = (struct hammer_mount *)mp->mnt_data; 2555 2556 lwkt_gettoken(&hmp->fs_token); 2557 2558 switch(ap->a_op) { 2559 case MOUNTCTL_SET_EXPORT: 2560 if (ap->a_ctllen != sizeof(struct export_args)) 2561 error = EINVAL; 2562 else 2563 error = hammer_vfs_export(mp, ap->a_op, 2564 (const struct export_args *)ap->a_ctl); 2565 break; 2566 case MOUNTCTL_MOUNTFLAGS: 2567 /* 2568 * Call standard mountctl VOP function 2569 * so we get user mount flags. 2570 */ 2571 error = vop_stdmountctl(ap); 2572 if (error) 2573 break; 2574 2575 usedbytes = *ap->a_res; 2576 2577 if (usedbytes > 0 && usedbytes < ap->a_buflen) { 2578 usedbytes += vfs_flagstostr(hmp->hflags, extraopt, 2579 ap->a_buf, 2580 ap->a_buflen - usedbytes, 2581 &error); 2582 } 2583 2584 *ap->a_res += usedbytes; 2585 break; 2586 default: 2587 error = vop_stdmountctl(ap); 2588 break; 2589 } 2590 lwkt_reltoken(&hmp->fs_token); 2591 return(error); 2592 } 2593 2594 /* 2595 * hammer_vop_strategy { vp, bio } 2596 * 2597 * Strategy call, used for regular file read & write only. Note that the 2598 * bp may represent a cluster. 2599 * 2600 * To simplify operation and allow better optimizations in the future, 2601 * this code does not make any assumptions with regards to buffer alignment 2602 * or size. 2603 */ 2604 static 2605 int 2606 hammer_vop_strategy(struct vop_strategy_args *ap) 2607 { 2608 struct buf *bp; 2609 int error; 2610 2611 bp = ap->a_bio->bio_buf; 2612 2613 switch(bp->b_cmd) { 2614 case BUF_CMD_READ: 2615 error = hammer_vop_strategy_read(ap); 2616 break; 2617 case BUF_CMD_WRITE: 2618 error = hammer_vop_strategy_write(ap); 2619 break; 2620 default: 2621 bp->b_error = error = EINVAL; 2622 bp->b_flags |= B_ERROR; 2623 biodone(ap->a_bio); 2624 break; 2625 } 2626 2627 /* hammer_dump_dedup_cache(((hammer_inode_t)ap->a_vp->v_data)->hmp); */ 2628 2629 return (error); 2630 } 2631 2632 /* 2633 * Read from a regular file. Iterate the related records and fill in the 2634 * BIO/BUF. Gaps are zero-filled. 2635 * 2636 * The support code in hammer_object.c should be used to deal with mixed 2637 * in-memory and on-disk records. 2638 * 2639 * NOTE: Can be called from the cluster code with an oversized buf. 2640 * 2641 * XXX atime update 2642 */ 2643 static 2644 int 2645 hammer_vop_strategy_read(struct vop_strategy_args *ap) 2646 { 2647 struct hammer_transaction trans; 2648 struct hammer_inode *ip; 2649 struct hammer_inode *dip; 2650 hammer_mount_t hmp; 2651 struct hammer_cursor cursor; 2652 hammer_base_elm_t base; 2653 hammer_off_t disk_offset; 2654 struct bio *bio; 2655 struct bio *nbio; 2656 struct buf *bp; 2657 int64_t rec_offset; 2658 int64_t ran_end; 2659 int64_t tmp64; 2660 int error; 2661 int boff; 2662 int roff; 2663 int n; 2664 int isdedupable; 2665 2666 bio = ap->a_bio; 2667 bp = bio->bio_buf; 2668 ip = ap->a_vp->v_data; 2669 hmp = ip->hmp; 2670 2671 /* 2672 * The zone-2 disk offset may have been set by the cluster code via 2673 * a BMAP operation, or else should be NOOFFSET. 2674 * 2675 * Checking the high bits for a match against zone-2 should suffice. 2676 * 2677 * In cases where a lot of data duplication is present it may be 2678 * more beneficial to drop through and doubule-buffer through the 2679 * device. 2680 */ 2681 nbio = push_bio(bio); 2682 if ((nbio->bio_offset & HAMMER_OFF_ZONE_MASK) == 2683 HAMMER_ZONE_LARGE_DATA) { 2684 if (hammer_double_buffer == 0) { 2685 lwkt_gettoken(&hmp->fs_token); 2686 error = hammer_io_direct_read(hmp, nbio, NULL); 2687 lwkt_reltoken(&hmp->fs_token); 2688 return (error); 2689 } 2690 2691 /* 2692 * Try to shortcut requests for double_buffer mode too. 2693 * Since this mode runs through the device buffer cache 2694 * only compatible buffer sizes (meaning those generated 2695 * by normal filesystem buffers) are legal. 2696 */ 2697 if (hammer_live_dedup == 0 && (bp->b_flags & B_PAGING) == 0) { 2698 lwkt_gettoken(&hmp->fs_token); 2699 error = hammer_io_indirect_read(hmp, nbio, NULL); 2700 lwkt_reltoken(&hmp->fs_token); 2701 return (error); 2702 } 2703 } 2704 2705 /* 2706 * Well, that sucked. Do it the hard way. If all the stars are 2707 * aligned we may still be able to issue a direct-read. 2708 */ 2709 lwkt_gettoken(&hmp->fs_token); 2710 hammer_simple_transaction(&trans, hmp); 2711 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 2712 2713 /* 2714 * Key range (begin and end inclusive) to scan. Note that the key's 2715 * stored in the actual records represent BASE+LEN, not BASE. The 2716 * first record containing bio_offset will have a key > bio_offset. 2717 */ 2718 cursor.key_beg.localization = ip->obj_localization | 2719 HAMMER_LOCALIZE_MISC; 2720 cursor.key_beg.obj_id = ip->obj_id; 2721 cursor.key_beg.create_tid = 0; 2722 cursor.key_beg.delete_tid = 0; 2723 cursor.key_beg.obj_type = 0; 2724 cursor.key_beg.key = bio->bio_offset + 1; 2725 cursor.asof = ip->obj_asof; 2726 cursor.flags |= HAMMER_CURSOR_ASOF; 2727 2728 cursor.key_end = cursor.key_beg; 2729 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE); 2730 #if 0 2731 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) { 2732 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB; 2733 cursor.key_end.rec_type = HAMMER_RECTYPE_DB; 2734 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL; 2735 } else 2736 #endif 2737 { 2738 ran_end = bio->bio_offset + bp->b_bufsize; 2739 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA; 2740 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA; 2741 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */ 2742 if (tmp64 < ran_end) 2743 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL; 2744 else 2745 cursor.key_end.key = ran_end + MAXPHYS + 1; 2746 } 2747 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE; 2748 2749 /* 2750 * Set NOSWAPCACHE for cursor data extraction if double buffering 2751 * is disabled or (if the file is not marked cacheable via chflags 2752 * and vm.swapcache_use_chflags is enabled). 2753 */ 2754 if (hammer_double_buffer == 0 || 2755 ((ap->a_vp->v_flag & VSWAPCACHE) == 0 && 2756 vm_swapcache_use_chflags)) { 2757 cursor.flags |= HAMMER_CURSOR_NOSWAPCACHE; 2758 } 2759 2760 error = hammer_ip_first(&cursor); 2761 boff = 0; 2762 2763 while (error == 0) { 2764 /* 2765 * Get the base file offset of the record. The key for 2766 * data records is (base + bytes) rather then (base). 2767 */ 2768 base = &cursor.leaf->base; 2769 rec_offset = base->key - cursor.leaf->data_len; 2770 2771 /* 2772 * Calculate the gap, if any, and zero-fill it. 2773 * 2774 * n is the offset of the start of the record verses our 2775 * current seek offset in the bio. 2776 */ 2777 n = (int)(rec_offset - (bio->bio_offset + boff)); 2778 if (n > 0) { 2779 if (n > bp->b_bufsize - boff) 2780 n = bp->b_bufsize - boff; 2781 bzero((char *)bp->b_data + boff, n); 2782 boff += n; 2783 n = 0; 2784 } 2785 2786 /* 2787 * Calculate the data offset in the record and the number 2788 * of bytes we can copy. 2789 * 2790 * There are two degenerate cases. First, boff may already 2791 * be at bp->b_bufsize. Secondly, the data offset within 2792 * the record may exceed the record's size. 2793 */ 2794 roff = -n; 2795 rec_offset += roff; 2796 n = cursor.leaf->data_len - roff; 2797 if (n <= 0) { 2798 hdkprintf("bad n=%d roff=%d\n", n, roff); 2799 n = 0; 2800 } else if (n > bp->b_bufsize - boff) { 2801 n = bp->b_bufsize - boff; 2802 } 2803 2804 /* 2805 * Deal with cached truncations. This cool bit of code 2806 * allows truncate()/ftruncate() to avoid having to sync 2807 * the file. 2808 * 2809 * If the frontend is truncated then all backend records are 2810 * subject to the frontend's truncation. 2811 * 2812 * If the backend is truncated then backend records on-disk 2813 * (but not in-memory) are subject to the backend's 2814 * truncation. In-memory records owned by the backend 2815 * represent data written after the truncation point on the 2816 * backend and must not be truncated. 2817 * 2818 * Truncate operations deal with frontend buffer cache 2819 * buffers and frontend-owned in-memory records synchronously. 2820 */ 2821 if (ip->flags & HAMMER_INODE_TRUNCATED) { 2822 if (hammer_cursor_ondisk(&cursor)/* || 2823 cursor.iprec->flush_state == HAMMER_FST_FLUSH*/) { 2824 if (ip->trunc_off <= rec_offset) 2825 n = 0; 2826 else if (ip->trunc_off < rec_offset + n) 2827 n = (int)(ip->trunc_off - rec_offset); 2828 } 2829 } 2830 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 2831 if (hammer_cursor_ondisk(&cursor)) { 2832 if (ip->sync_trunc_off <= rec_offset) 2833 n = 0; 2834 else if (ip->sync_trunc_off < rec_offset + n) 2835 n = (int)(ip->sync_trunc_off - rec_offset); 2836 } 2837 } 2838 2839 /* 2840 * Try to issue a direct read into our bio if possible, 2841 * otherwise resolve the element data into a hammer_buffer 2842 * and copy. 2843 * 2844 * The buffer on-disk should be zerod past any real 2845 * truncation point, but may not be for any synthesized 2846 * truncation point from above. 2847 * 2848 * NOTE: disk_offset is only valid if the cursor data is 2849 * on-disk. 2850 */ 2851 disk_offset = cursor.leaf->data_offset + roff; 2852 isdedupable = (boff == 0 && n == bp->b_bufsize && 2853 hammer_cursor_ondisk(&cursor) && 2854 ((int)disk_offset & HAMMER_BUFMASK) == 0); 2855 2856 if (isdedupable && hammer_double_buffer == 0) { 2857 /* 2858 * Direct read case 2859 */ 2860 KKASSERT((disk_offset & HAMMER_OFF_ZONE_MASK) == 2861 HAMMER_ZONE_LARGE_DATA); 2862 nbio->bio_offset = disk_offset; 2863 error = hammer_io_direct_read(hmp, nbio, cursor.leaf); 2864 if (hammer_live_dedup && error == 0) 2865 hammer_dedup_cache_add(ip, cursor.leaf); 2866 goto done; 2867 } else if (isdedupable) { 2868 /* 2869 * Async I/O case for reading from backing store 2870 * and copying the data to the filesystem buffer. 2871 * live-dedup has to verify the data anyway if it 2872 * gets a hit later so we can just add the entry 2873 * now. 2874 */ 2875 KKASSERT((disk_offset & HAMMER_OFF_ZONE_MASK) == 2876 HAMMER_ZONE_LARGE_DATA); 2877 nbio->bio_offset = disk_offset; 2878 if (hammer_live_dedup) 2879 hammer_dedup_cache_add(ip, cursor.leaf); 2880 error = hammer_io_indirect_read(hmp, nbio, cursor.leaf); 2881 goto done; 2882 } else if (n) { 2883 error = hammer_ip_resolve_data(&cursor); 2884 if (error == 0) { 2885 if (hammer_live_dedup && isdedupable) 2886 hammer_dedup_cache_add(ip, cursor.leaf); 2887 bcopy((char *)cursor.data + roff, 2888 (char *)bp->b_data + boff, n); 2889 } 2890 } 2891 if (error) 2892 break; 2893 2894 /* 2895 * We have to be sure that the only elements added to the 2896 * dedup cache are those which are already on-media. 2897 */ 2898 if (hammer_live_dedup && hammer_cursor_ondisk(&cursor)) 2899 hammer_dedup_cache_add(ip, cursor.leaf); 2900 2901 /* 2902 * Iterate until we have filled the request. 2903 */ 2904 boff += n; 2905 if (boff == bp->b_bufsize) 2906 break; 2907 error = hammer_ip_next(&cursor); 2908 } 2909 2910 /* 2911 * There may have been a gap after the last record 2912 */ 2913 if (error == ENOENT) 2914 error = 0; 2915 if (error == 0 && boff != bp->b_bufsize) { 2916 KKASSERT(boff < bp->b_bufsize); 2917 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff); 2918 /* boff = bp->b_bufsize; */ 2919 } 2920 2921 /* 2922 * Disallow swapcache operation on the vnode buffer if double 2923 * buffering is enabled, the swapcache will get the data via 2924 * the block device buffer. 2925 */ 2926 if (hammer_double_buffer) 2927 bp->b_flags |= B_NOTMETA; 2928 2929 /* 2930 * Cleanup 2931 */ 2932 bp->b_resid = 0; 2933 bp->b_error = error; 2934 if (error) 2935 bp->b_flags |= B_ERROR; 2936 biodone(ap->a_bio); 2937 2938 done: 2939 /* 2940 * Cache the b-tree node for the last data read in cache[1]. 2941 * 2942 * If we hit the file EOF then also cache the node in the 2943 * governing directory's cache[3], it will be used to initialize 2944 * the new inode's cache[1] for any inodes looked up via the directory. 2945 * 2946 * This doesn't reduce disk accesses since the B-Tree chain is 2947 * likely cached, but it does reduce cpu overhead when looking 2948 * up file offsets for cpdup/tar/cpio style iterations. 2949 */ 2950 if (cursor.node) 2951 hammer_cache_node(&ip->cache[1], cursor.node); 2952 if (ran_end >= ip->ino_data.size) { 2953 dip = hammer_find_inode(&trans, ip->ino_data.parent_obj_id, 2954 ip->obj_asof, ip->obj_localization); 2955 if (dip) { 2956 hammer_cache_node(&dip->cache[3], cursor.node); 2957 hammer_rel_inode(dip, 0); 2958 } 2959 } 2960 hammer_done_cursor(&cursor); 2961 hammer_done_transaction(&trans); 2962 lwkt_reltoken(&hmp->fs_token); 2963 return(error); 2964 } 2965 2966 /* 2967 * BMAP operation - used to support cluster_read() only. 2968 * 2969 * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb) 2970 * 2971 * This routine may return EOPNOTSUPP if the opration is not supported for 2972 * the specified offset. The contents of the pointer arguments do not 2973 * need to be initialized in that case. 2974 * 2975 * If a disk address is available and properly aligned return 0 with 2976 * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately 2977 * to the run-length relative to that offset. Callers may assume that 2978 * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently 2979 * large, so return EOPNOTSUPP if it is not sufficiently large. 2980 */ 2981 static 2982 int 2983 hammer_vop_bmap(struct vop_bmap_args *ap) 2984 { 2985 struct hammer_transaction trans; 2986 struct hammer_inode *ip; 2987 hammer_mount_t hmp; 2988 struct hammer_cursor cursor; 2989 hammer_base_elm_t base; 2990 int64_t rec_offset; 2991 int64_t ran_end; 2992 int64_t tmp64; 2993 int64_t base_offset; 2994 int64_t base_disk_offset; 2995 int64_t last_offset; 2996 hammer_off_t last_disk_offset; 2997 hammer_off_t disk_offset; 2998 int rec_len; 2999 int error; 3000 int blksize; 3001 3002 ++hammer_stats_file_iopsr; 3003 ip = ap->a_vp->v_data; 3004 hmp = ip->hmp; 3005 3006 /* 3007 * We can only BMAP regular files. We can't BMAP database files, 3008 * directories, etc. 3009 */ 3010 if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE) 3011 return(EOPNOTSUPP); 3012 3013 /* 3014 * bmap is typically called with runp/runb both NULL when used 3015 * for writing. We do not support BMAP for writing atm. 3016 */ 3017 if (ap->a_cmd != BUF_CMD_READ) 3018 return(EOPNOTSUPP); 3019 3020 /* 3021 * Scan the B-Tree to acquire blockmap addresses, then translate 3022 * to raw addresses. 3023 */ 3024 lwkt_gettoken(&hmp->fs_token); 3025 hammer_simple_transaction(&trans, hmp); 3026 3027 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 3028 3029 /* 3030 * Key range (begin and end inclusive) to scan. Note that the key's 3031 * stored in the actual records represent BASE+LEN, not BASE. The 3032 * first record containing bio_offset will have a key > bio_offset. 3033 */ 3034 cursor.key_beg.localization = ip->obj_localization | 3035 HAMMER_LOCALIZE_MISC; 3036 cursor.key_beg.obj_id = ip->obj_id; 3037 cursor.key_beg.create_tid = 0; 3038 cursor.key_beg.delete_tid = 0; 3039 cursor.key_beg.obj_type = 0; 3040 if (ap->a_runb) 3041 cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1; 3042 else 3043 cursor.key_beg.key = ap->a_loffset + 1; 3044 if (cursor.key_beg.key < 0) 3045 cursor.key_beg.key = 0; 3046 cursor.asof = ip->obj_asof; 3047 cursor.flags |= HAMMER_CURSOR_ASOF; 3048 3049 cursor.key_end = cursor.key_beg; 3050 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE); 3051 3052 ran_end = ap->a_loffset + MAXPHYS; 3053 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA; 3054 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA; 3055 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */ 3056 if (tmp64 < ran_end) 3057 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL; 3058 else 3059 cursor.key_end.key = ran_end + MAXPHYS + 1; 3060 3061 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE; 3062 3063 error = hammer_ip_first(&cursor); 3064 base_offset = last_offset = 0; 3065 base_disk_offset = last_disk_offset = 0; 3066 3067 while (error == 0) { 3068 /* 3069 * Get the base file offset of the record. The key for 3070 * data records is (base + bytes) rather then (base). 3071 * 3072 * NOTE: rec_offset + rec_len may exceed the end-of-file. 3073 * The extra bytes should be zero on-disk and the BMAP op 3074 * should still be ok. 3075 */ 3076 base = &cursor.leaf->base; 3077 rec_offset = base->key - cursor.leaf->data_len; 3078 rec_len = cursor.leaf->data_len; 3079 3080 /* 3081 * Incorporate any cached truncation. 3082 * 3083 * NOTE: Modifications to rec_len based on synthesized 3084 * truncation points remove the guarantee that any extended 3085 * data on disk is zero (since the truncations may not have 3086 * taken place on-media yet). 3087 */ 3088 if (ip->flags & HAMMER_INODE_TRUNCATED) { 3089 if (hammer_cursor_ondisk(&cursor) || 3090 cursor.iprec->flush_state == HAMMER_FST_FLUSH) { 3091 if (ip->trunc_off <= rec_offset) 3092 rec_len = 0; 3093 else if (ip->trunc_off < rec_offset + rec_len) 3094 rec_len = (int)(ip->trunc_off - rec_offset); 3095 } 3096 } 3097 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 3098 if (hammer_cursor_ondisk(&cursor)) { 3099 if (ip->sync_trunc_off <= rec_offset) 3100 rec_len = 0; 3101 else if (ip->sync_trunc_off < rec_offset + rec_len) 3102 rec_len = (int)(ip->sync_trunc_off - rec_offset); 3103 } 3104 } 3105 3106 /* 3107 * Accumulate information. If we have hit a discontiguous 3108 * block reset base_offset unless we are already beyond the 3109 * requested offset. If we are, that's it, we stop. 3110 */ 3111 if (error) 3112 break; 3113 if (hammer_cursor_ondisk(&cursor)) { 3114 disk_offset = cursor.leaf->data_offset; 3115 if (rec_offset != last_offset || 3116 disk_offset != last_disk_offset) { 3117 if (rec_offset > ap->a_loffset) 3118 break; 3119 base_offset = rec_offset; 3120 base_disk_offset = disk_offset; 3121 } 3122 last_offset = rec_offset + rec_len; 3123 last_disk_offset = disk_offset + rec_len; 3124 3125 if (hammer_live_dedup) 3126 hammer_dedup_cache_add(ip, cursor.leaf); 3127 } 3128 3129 error = hammer_ip_next(&cursor); 3130 } 3131 3132 if (cursor.node) 3133 hammer_cache_node(&ip->cache[1], cursor.node); 3134 3135 hammer_done_cursor(&cursor); 3136 hammer_done_transaction(&trans); 3137 lwkt_reltoken(&hmp->fs_token); 3138 3139 /* 3140 * If we couldn't find any records or the records we did find were 3141 * all behind the requested offset, return failure. A forward 3142 * truncation can leave a hole w/ no on-disk records. 3143 */ 3144 if (last_offset == 0 || last_offset < ap->a_loffset) 3145 return (EOPNOTSUPP); 3146 3147 /* 3148 * Figure out the block size at the requested offset and adjust 3149 * our limits so the cluster_read() does not create inappropriately 3150 * sized buffer cache buffers. 3151 */ 3152 blksize = hammer_blocksize(ap->a_loffset); 3153 if (hammer_blocksize(base_offset) != blksize) { 3154 base_offset = hammer_blockdemarc(base_offset, ap->a_loffset); 3155 } 3156 if (last_offset != ap->a_loffset && 3157 hammer_blocksize(last_offset - 1) != blksize) { 3158 last_offset = hammer_blockdemarc(ap->a_loffset, 3159 last_offset - 1); 3160 } 3161 3162 /* 3163 * Returning EOPNOTSUPP simply prevents the direct-IO optimization 3164 * from occuring. 3165 */ 3166 disk_offset = base_disk_offset + (ap->a_loffset - base_offset); 3167 3168 if ((disk_offset & HAMMER_OFF_ZONE_MASK) != HAMMER_ZONE_LARGE_DATA) { 3169 /* 3170 * Only large-data zones can be direct-IOd 3171 */ 3172 error = EOPNOTSUPP; 3173 } else if ((disk_offset & HAMMER_BUFMASK) || 3174 (last_offset - ap->a_loffset) < blksize) { 3175 /* 3176 * doffsetp is not aligned or the forward run size does 3177 * not cover a whole buffer, disallow the direct I/O. 3178 */ 3179 error = EOPNOTSUPP; 3180 } else { 3181 /* 3182 * We're good. 3183 */ 3184 *ap->a_doffsetp = disk_offset; 3185 if (ap->a_runb) { 3186 *ap->a_runb = ap->a_loffset - base_offset; 3187 KKASSERT(*ap->a_runb >= 0); 3188 } 3189 if (ap->a_runp) { 3190 *ap->a_runp = last_offset - ap->a_loffset; 3191 KKASSERT(*ap->a_runp >= 0); 3192 } 3193 error = 0; 3194 } 3195 return(error); 3196 } 3197 3198 /* 3199 * Write to a regular file. Because this is a strategy call the OS is 3200 * trying to actually get data onto the media. 3201 */ 3202 static 3203 int 3204 hammer_vop_strategy_write(struct vop_strategy_args *ap) 3205 { 3206 hammer_record_t record; 3207 hammer_mount_t hmp; 3208 hammer_inode_t ip; 3209 struct bio *bio; 3210 struct buf *bp; 3211 int blksize __debugvar; 3212 int bytes; 3213 int error; 3214 3215 bio = ap->a_bio; 3216 bp = bio->bio_buf; 3217 ip = ap->a_vp->v_data; 3218 hmp = ip->hmp; 3219 3220 blksize = hammer_blocksize(bio->bio_offset); 3221 KKASSERT(bp->b_bufsize == blksize); 3222 3223 if (ip->flags & HAMMER_INODE_RO) { 3224 bp->b_error = EROFS; 3225 bp->b_flags |= B_ERROR; 3226 biodone(ap->a_bio); 3227 return(EROFS); 3228 } 3229 3230 lwkt_gettoken(&hmp->fs_token); 3231 3232 /* 3233 * Disallow swapcache operation on the vnode buffer if double 3234 * buffering is enabled, the swapcache will get the data via 3235 * the block device buffer. 3236 */ 3237 if (hammer_double_buffer) 3238 bp->b_flags |= B_NOTMETA; 3239 3240 /* 3241 * Interlock with inode destruction (no in-kernel or directory 3242 * topology visibility). If we queue new IO while trying to 3243 * destroy the inode we can deadlock the vtrunc call in 3244 * hammer_inode_unloadable_check(). 3245 * 3246 * Besides, there's no point flushing a bp associated with an 3247 * inode that is being destroyed on-media and has no kernel 3248 * references. 3249 */ 3250 if ((ip->flags | ip->sync_flags) & 3251 (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) { 3252 bp->b_resid = 0; 3253 biodone(ap->a_bio); 3254 lwkt_reltoken(&hmp->fs_token); 3255 return(0); 3256 } 3257 3258 /* 3259 * Reserve space and issue a direct-write from the front-end. 3260 * NOTE: The direct_io code will hammer_bread/bcopy smaller 3261 * allocations. 3262 * 3263 * An in-memory record will be installed to reference the storage 3264 * until the flusher can get to it. 3265 * 3266 * Since we own the high level bio the front-end will not try to 3267 * do a direct-read until the write completes. 3268 * 3269 * NOTE: The only time we do not reserve a full-sized buffers 3270 * worth of data is if the file is small. We do not try to 3271 * allocate a fragment (from the small-data zone) at the end of 3272 * an otherwise large file as this can lead to wildly separated 3273 * data. 3274 */ 3275 KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0); 3276 KKASSERT(bio->bio_offset < ip->ino_data.size); 3277 if (bio->bio_offset || ip->ino_data.size > HAMMER_HBUFSIZE) 3278 bytes = bp->b_bufsize; 3279 else 3280 bytes = ((int)ip->ino_data.size + 15) & ~15; 3281 3282 record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data, 3283 bytes, &error); 3284 3285 /* 3286 * B_VFSFLAG1 indicates that a REDO_WRITE entry was generated 3287 * in hammer_vop_write(). We must flag the record so the proper 3288 * REDO_TERM_WRITE entry is generated during the flush. 3289 */ 3290 if (record) { 3291 if (bp->b_flags & B_VFSFLAG1) { 3292 record->flags |= HAMMER_RECF_REDO; 3293 bp->b_flags &= ~B_VFSFLAG1; 3294 } 3295 if (record->flags & HAMMER_RECF_DEDUPED) { 3296 bp->b_resid = 0; 3297 hammer_ip_replace_bulk(hmp, record); 3298 biodone(ap->a_bio); 3299 } else { 3300 hammer_io_direct_write(hmp, bio, record); 3301 } 3302 if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs) 3303 hammer_flush_inode(ip, 0); 3304 } else { 3305 bp->b_bio2.bio_offset = NOOFFSET; 3306 bp->b_error = error; 3307 bp->b_flags |= B_ERROR; 3308 biodone(ap->a_bio); 3309 } 3310 lwkt_reltoken(&hmp->fs_token); 3311 return(error); 3312 } 3313 3314 /* 3315 * dounlink - disconnect a directory entry 3316 * 3317 * XXX whiteout support not really in yet 3318 */ 3319 static int 3320 hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch, 3321 struct vnode *dvp, struct ucred *cred, 3322 int flags, int isdir) 3323 { 3324 struct namecache *ncp; 3325 hammer_inode_t dip; 3326 hammer_inode_t ip; 3327 hammer_mount_t hmp; 3328 struct hammer_cursor cursor; 3329 int64_t namekey; 3330 uint32_t max_iterations; 3331 int nlen, error; 3332 3333 /* 3334 * Calculate the namekey and setup the key range for the scan. This 3335 * works kinda like a chained hash table where the lower 32 bits 3336 * of the namekey synthesize the chain. 3337 * 3338 * The key range is inclusive of both key_beg and key_end. 3339 */ 3340 dip = VTOI(dvp); 3341 ncp = nch->ncp; 3342 hmp = dip->hmp; 3343 3344 if (dip->flags & HAMMER_INODE_RO) 3345 return (EROFS); 3346 3347 namekey = hammer_directory_namekey(dip, ncp->nc_name, ncp->nc_nlen, 3348 &max_iterations); 3349 retry: 3350 hammer_init_cursor(trans, &cursor, &dip->cache[1], dip); 3351 cursor.key_beg.localization = dip->obj_localization | 3352 hammer_dir_localization(dip); 3353 cursor.key_beg.obj_id = dip->obj_id; 3354 cursor.key_beg.key = namekey; 3355 cursor.key_beg.create_tid = 0; 3356 cursor.key_beg.delete_tid = 0; 3357 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 3358 cursor.key_beg.obj_type = 0; 3359 3360 cursor.key_end = cursor.key_beg; 3361 cursor.key_end.key += max_iterations; 3362 cursor.asof = dip->obj_asof; 3363 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 3364 3365 /* 3366 * Scan all matching records (the chain), locate the one matching 3367 * the requested path component. info->last_error contains the 3368 * error code on search termination and could be 0, ENOENT, or 3369 * something else. 3370 * 3371 * The hammer_ip_*() functions merge in-memory records with on-disk 3372 * records for the purposes of the search. 3373 */ 3374 error = hammer_ip_first(&cursor); 3375 3376 while (error == 0) { 3377 error = hammer_ip_resolve_data(&cursor); 3378 if (error) 3379 break; 3380 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF; 3381 KKASSERT(nlen > 0); 3382 if (ncp->nc_nlen == nlen && 3383 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) { 3384 break; 3385 } 3386 error = hammer_ip_next(&cursor); 3387 } 3388 3389 /* 3390 * If all is ok we have to get the inode so we can adjust nlinks. 3391 * To avoid a deadlock with the flusher we must release the inode 3392 * lock on the directory when acquiring the inode for the entry. 3393 * 3394 * If the target is a directory, it must be empty. 3395 */ 3396 if (error == 0) { 3397 hammer_unlock(&cursor.ip->lock); 3398 ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id, 3399 hmp->asof, 3400 cursor.data->entry.localization, 3401 0, &error); 3402 hammer_lock_sh(&cursor.ip->lock); 3403 if (error == ENOENT) { 3404 hkprintf("WARNING: Removing dirent w/missing inode " 3405 "\"%s\"\n" 3406 "\tobj_id = %016llx\n", 3407 ncp->nc_name, 3408 (long long)cursor.data->entry.obj_id); 3409 error = 0; 3410 } 3411 3412 /* 3413 * If isdir >= 0 we validate that the entry is or is not a 3414 * directory. If isdir < 0 we don't care. 3415 */ 3416 if (error == 0 && isdir >= 0 && ip) { 3417 if (isdir && 3418 ip->ino_data.obj_type != HAMMER_OBJTYPE_DIRECTORY) { 3419 error = ENOTDIR; 3420 } else if (isdir == 0 && 3421 ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY) { 3422 error = EISDIR; 3423 } 3424 } 3425 3426 /* 3427 * If we are trying to remove a directory the directory must 3428 * be empty. 3429 * 3430 * The check directory code can loop and deadlock/retry. Our 3431 * own cursor's node locks must be released to avoid a 3-way 3432 * deadlock with the flusher if the check directory code 3433 * blocks. 3434 * 3435 * If any changes whatsoever have been made to the cursor 3436 * set EDEADLK and retry. 3437 * 3438 * WARNING: See warnings in hammer_unlock_cursor() 3439 * function. 3440 */ 3441 if (error == 0 && ip && ip->ino_data.obj_type == 3442 HAMMER_OBJTYPE_DIRECTORY) { 3443 hammer_unlock_cursor(&cursor); 3444 error = hammer_ip_check_directory_empty(trans, ip); 3445 hammer_lock_cursor(&cursor); 3446 if (cursor.flags & HAMMER_CURSOR_RETEST) { 3447 hkprintf("Warning: avoided deadlock " 3448 "on rmdir '%s'\n", 3449 ncp->nc_name); 3450 error = EDEADLK; 3451 } 3452 } 3453 3454 /* 3455 * Delete the directory entry. 3456 * 3457 * WARNING: hammer_ip_del_directory() may have to terminate 3458 * the cursor to avoid a deadlock. It is ok to call 3459 * hammer_done_cursor() twice. 3460 */ 3461 if (error == 0) { 3462 error = hammer_ip_del_directory(trans, &cursor, 3463 dip, ip); 3464 } 3465 hammer_done_cursor(&cursor); 3466 if (error == 0) { 3467 /* 3468 * Tell the namecache that we are now unlinked. 3469 */ 3470 cache_unlink(nch); 3471 3472 /* 3473 * NOTE: ip->vp, if non-NULL, cannot be directly 3474 * referenced without formally acquiring the 3475 * vp since the vp might have zero refs on it, 3476 * or in the middle of a reclaim, etc. 3477 * 3478 * NOTE: The cache_setunresolved() can rip the vp 3479 * out from under us since the vp may not have 3480 * any refs, in which case ip->vp will be NULL 3481 * from the outset. 3482 */ 3483 while (ip && ip->vp) { 3484 struct vnode *vp; 3485 3486 error = hammer_get_vnode(ip, &vp); 3487 if (error == 0 && vp) { 3488 vn_unlock(vp); 3489 hammer_knote(ip->vp, NOTE_DELETE); 3490 #if 0 3491 /* 3492 * Don't do this, it can deadlock 3493 * on concurrent rm's of hardlinks. 3494 * Shouldn't be needed any more. 3495 */ 3496 cache_inval_vp(ip->vp, CINV_DESTROY); 3497 #endif 3498 vrele(vp); 3499 break; 3500 } 3501 hdkprintf("ip/vp race1 avoided\n"); 3502 } 3503 } 3504 if (ip) 3505 hammer_rel_inode(ip, 0); 3506 } else { 3507 hammer_done_cursor(&cursor); 3508 } 3509 if (error == EDEADLK) 3510 goto retry; 3511 3512 return (error); 3513 } 3514 3515 /************************************************************************ 3516 * FIFO AND SPECFS OPS * 3517 ************************************************************************ 3518 * 3519 */ 3520 static int 3521 hammer_vop_fifoclose (struct vop_close_args *ap) 3522 { 3523 /* XXX update itimes */ 3524 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3525 } 3526 3527 static int 3528 hammer_vop_fiforead (struct vop_read_args *ap) 3529 { 3530 int error; 3531 3532 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 3533 /* XXX update access time */ 3534 return (error); 3535 } 3536 3537 static int 3538 hammer_vop_fifowrite (struct vop_write_args *ap) 3539 { 3540 int error; 3541 3542 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 3543 /* XXX update access time */ 3544 return (error); 3545 } 3546 3547 static 3548 int 3549 hammer_vop_fifokqfilter(struct vop_kqfilter_args *ap) 3550 { 3551 int error; 3552 3553 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 3554 if (error) 3555 error = hammer_vop_kqfilter(ap); 3556 return(error); 3557 } 3558 3559 /************************************************************************ 3560 * KQFILTER OPS * 3561 ************************************************************************ 3562 * 3563 */ 3564 static void filt_hammerdetach(struct knote *kn); 3565 static int filt_hammerread(struct knote *kn, long hint); 3566 static int filt_hammerwrite(struct knote *kn, long hint); 3567 static int filt_hammervnode(struct knote *kn, long hint); 3568 3569 static struct filterops hammerread_filtops = 3570 { FILTEROP_ISFD | FILTEROP_MPSAFE, 3571 NULL, filt_hammerdetach, filt_hammerread }; 3572 static struct filterops hammerwrite_filtops = 3573 { FILTEROP_ISFD | FILTEROP_MPSAFE, 3574 NULL, filt_hammerdetach, filt_hammerwrite }; 3575 static struct filterops hammervnode_filtops = 3576 { FILTEROP_ISFD | FILTEROP_MPSAFE, 3577 NULL, filt_hammerdetach, filt_hammervnode }; 3578 3579 static 3580 int 3581 hammer_vop_kqfilter(struct vop_kqfilter_args *ap) 3582 { 3583 struct vnode *vp = ap->a_vp; 3584 struct knote *kn = ap->a_kn; 3585 3586 switch (kn->kn_filter) { 3587 case EVFILT_READ: 3588 kn->kn_fop = &hammerread_filtops; 3589 break; 3590 case EVFILT_WRITE: 3591 kn->kn_fop = &hammerwrite_filtops; 3592 break; 3593 case EVFILT_VNODE: 3594 kn->kn_fop = &hammervnode_filtops; 3595 break; 3596 default: 3597 return (EOPNOTSUPP); 3598 } 3599 3600 kn->kn_hook = (caddr_t)vp; 3601 3602 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 3603 3604 return(0); 3605 } 3606 3607 static void 3608 filt_hammerdetach(struct knote *kn) 3609 { 3610 struct vnode *vp = (void *)kn->kn_hook; 3611 3612 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 3613 } 3614 3615 static int 3616 filt_hammerread(struct knote *kn, long hint) 3617 { 3618 struct vnode *vp = (void *)kn->kn_hook; 3619 hammer_inode_t ip = VTOI(vp); 3620 hammer_mount_t hmp = ip->hmp; 3621 off_t off; 3622 3623 if (hint == NOTE_REVOKE) { 3624 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 3625 return(1); 3626 } 3627 lwkt_gettoken(&hmp->fs_token); /* XXX use per-ip-token */ 3628 off = ip->ino_data.size - kn->kn_fp->f_offset; 3629 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 3630 lwkt_reltoken(&hmp->fs_token); 3631 if (kn->kn_sfflags & NOTE_OLDAPI) 3632 return(1); 3633 return (kn->kn_data != 0); 3634 } 3635 3636 static int 3637 filt_hammerwrite(struct knote *kn, long hint) 3638 { 3639 if (hint == NOTE_REVOKE) 3640 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 3641 kn->kn_data = 0; 3642 return (1); 3643 } 3644 3645 static int 3646 filt_hammervnode(struct knote *kn, long hint) 3647 { 3648 if (kn->kn_sfflags & hint) 3649 kn->kn_fflags |= hint; 3650 if (hint == NOTE_REVOKE) { 3651 kn->kn_flags |= (EV_EOF | EV_NODATA); 3652 return (1); 3653 } 3654 return (kn->kn_fflags != 0); 3655 } 3656 3657