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 + (MAXBSIZE - 1)) / MAXBSIZE; 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 * MAXBSIZE, &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_IOISSUED)) { 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_IOISSUED; 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 hammer_inode_t 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 hammer_inode_t 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 hammer_inode_t dip; 908 hammer_inode_t nip; 909 struct nchandle *nch; 910 hammer_mount_t hmp; 911 int error; 912 913 nch = ap->a_nch; 914 dip = VTOI(ap->a_dvp); 915 hmp = dip->hmp; 916 917 if (dip->flags & HAMMER_INODE_RO) 918 return (EROFS); 919 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 920 return (error); 921 922 /* 923 * Create a transaction to cover the operations we perform. 924 */ 925 lwkt_gettoken(&hmp->fs_token); 926 hammer_start_transaction(&trans, hmp); 927 ++hammer_stats_file_iopsw; 928 929 /* 930 * Create a new filesystem object of the requested type. The 931 * returned inode will be referenced and shared-locked to prevent 932 * it from being moved to the flusher. 933 */ 934 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 935 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 936 NULL, &nip); 937 if (error) { 938 hkprintf("hammer_create_inode error %d\n", error); 939 hammer_done_transaction(&trans); 940 *ap->a_vpp = NULL; 941 lwkt_reltoken(&hmp->fs_token); 942 return (error); 943 } 944 945 /* 946 * Add the new filesystem object to the directory. This will also 947 * bump the inode's link count. 948 */ 949 error = hammer_ip_add_direntry(&trans, dip, 950 nch->ncp->nc_name, nch->ncp->nc_nlen, 951 nip); 952 if (error) 953 hkprintf("hammer_ip_add_direntry error %d\n", error); 954 955 /* 956 * Finish up. 957 */ 958 if (error) { 959 hammer_rel_inode(nip, 0); 960 hammer_done_transaction(&trans); 961 *ap->a_vpp = NULL; 962 } else { 963 error = hammer_get_vnode(nip, ap->a_vpp); 964 hammer_done_transaction(&trans); 965 hammer_rel_inode(nip, 0); 966 if (error == 0) { 967 cache_setunresolved(ap->a_nch); 968 cache_setvp(ap->a_nch, *ap->a_vpp); 969 } 970 hammer_knote(ap->a_dvp, NOTE_WRITE); 971 } 972 lwkt_reltoken(&hmp->fs_token); 973 return (error); 974 } 975 976 /* 977 * hammer_vop_getattr { vp, vap } 978 * 979 * Retrieve an inode's attribute information. When accessing inodes 980 * historically we fake the atime field to ensure consistent results. 981 * The atime field is stored in the B-Tree element and allowed to be 982 * updated without cycling the element. 983 * 984 * MPSAFE - does not require fs_token 985 */ 986 static 987 int 988 hammer_vop_getattr(struct vop_getattr_args *ap) 989 { 990 hammer_inode_t ip = VTOI(ap->a_vp); 991 struct vattr *vap = ap->a_vap; 992 993 /* 994 * We want the fsid to be different when accessing a filesystem 995 * with different as-of's so programs like diff don't think 996 * the files are the same. 997 * 998 * We also want the fsid to be the same when comparing snapshots, 999 * or when comparing mirrors (which might be backed by different 1000 * physical devices). HAMMER fsids are based on the PFS's 1001 * shared_uuid field. 1002 * 1003 * XXX there is a chance of collision here. The va_fsid reported 1004 * by stat is different from the more involved fsid used in the 1005 * mount structure. 1006 */ 1007 ++hammer_stats_file_iopsr; 1008 hammer_lock_sh(&ip->lock); 1009 vap->va_fsid = ip->pfsm->fsid_udev ^ (uint32_t)ip->obj_asof ^ 1010 (uint32_t)(ip->obj_asof >> 32); 1011 1012 vap->va_fileid = ip->ino_leaf.base.obj_id; 1013 vap->va_mode = ip->ino_data.mode; 1014 vap->va_nlink = ip->ino_data.nlinks; 1015 vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid); 1016 vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid); 1017 vap->va_rmajor = 0; 1018 vap->va_rminor = 0; 1019 vap->va_size = ip->ino_data.size; 1020 1021 /* 1022 * Special case for @@PFS softlinks. The actual size of the 1023 * expanded softlink is "@@0x%016llx:%05d" == 26 bytes. 1024 * or for MAX_TID is "@@-1:%05d" == 10 bytes. 1025 * 1026 * Note that userspace hammer command does not allow users to 1027 * create a @@PFS softlink under an existing other PFS (id!=0) 1028 * so the ip localization here for @@PFS softlink is always 0. 1029 */ 1030 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_SOFTLINK && 1031 ip->ino_data.size == 10 && 1032 ip->obj_asof == HAMMER_MAX_TID && 1033 ip->obj_localization == HAMMER_DEF_LOCALIZATION && 1034 strncmp(ip->ino_data.ext.symlink, "@@PFS", 5) == 0) { 1035 if (hammer_is_pfs_slave(&ip->pfsm->pfsd)) 1036 vap->va_size = 26; 1037 else 1038 vap->va_size = 10; 1039 } 1040 1041 /* 1042 * We must provide a consistent atime and mtime for snapshots 1043 * so people can do a 'tar cf - ... | md5' on them and get 1044 * consistent results. 1045 */ 1046 if (ip->flags & HAMMER_INODE_RO) { 1047 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_atime); 1048 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_mtime); 1049 } else { 1050 hammer_time_to_timespec(ip->ino_data.atime, &vap->va_atime); 1051 hammer_time_to_timespec(ip->ino_data.mtime, &vap->va_mtime); 1052 } 1053 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_ctime); 1054 vap->va_flags = ip->ino_data.uflags; 1055 vap->va_gen = 1; /* hammer inums are unique for all time */ 1056 vap->va_blocksize = HAMMER_BUFSIZE; 1057 if (ip->ino_data.size >= HAMMER_XDEMARC) { 1058 vap->va_bytes = HAMMER_XBUFSIZE64_DOALIGN(ip->ino_data.size); 1059 } else if (ip->ino_data.size > HAMMER_HBUFSIZE) { 1060 vap->va_bytes = HAMMER_BUFSIZE64_DOALIGN(ip->ino_data.size); 1061 } else { 1062 vap->va_bytes = HAMMER_DATA_DOALIGN(ip->ino_data.size); 1063 } 1064 1065 vap->va_type = hammer_get_vnode_type(ip->ino_data.obj_type); 1066 vap->va_filerev = 0; /* XXX */ 1067 vap->va_uid_uuid = ip->ino_data.uid; 1068 vap->va_gid_uuid = ip->ino_data.gid; 1069 vap->va_fsid_uuid = ip->hmp->fsid; 1070 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID | 1071 VA_FSID_UUID_VALID; 1072 1073 switch (ip->ino_data.obj_type) { 1074 case HAMMER_OBJTYPE_CDEV: 1075 case HAMMER_OBJTYPE_BDEV: 1076 vap->va_rmajor = ip->ino_data.rmajor; 1077 vap->va_rminor = ip->ino_data.rminor; 1078 break; 1079 default: 1080 break; 1081 } 1082 hammer_unlock(&ip->lock); 1083 return(0); 1084 } 1085 1086 /* 1087 * hammer_vop_nresolve { nch, dvp, cred } 1088 * 1089 * Locate the requested directory entry. 1090 */ 1091 static 1092 int 1093 hammer_vop_nresolve(struct vop_nresolve_args *ap) 1094 { 1095 struct hammer_transaction trans; 1096 struct namecache *ncp; 1097 hammer_mount_t hmp; 1098 hammer_inode_t dip; 1099 hammer_inode_t ip; 1100 hammer_tid_t asof; 1101 struct hammer_cursor cursor; 1102 struct vnode *vp; 1103 int64_t namekey; 1104 int error; 1105 int i; 1106 int nlen; 1107 int flags; 1108 int ispfs; 1109 int64_t obj_id; 1110 uint32_t localization; 1111 uint32_t max_iterations; 1112 1113 /* 1114 * Misc initialization, plus handle as-of name extensions. Look for 1115 * the '@@' extension. Note that as-of files and directories cannot 1116 * be modified. 1117 */ 1118 dip = VTOI(ap->a_dvp); 1119 ncp = ap->a_nch->ncp; 1120 asof = dip->obj_asof; 1121 localization = dip->obj_localization; /* for code consistency */ 1122 nlen = ncp->nc_nlen; 1123 flags = dip->flags & HAMMER_INODE_RO; 1124 ispfs = 0; 1125 hmp = dip->hmp; 1126 1127 lwkt_gettoken(&hmp->fs_token); 1128 hammer_simple_transaction(&trans, hmp); 1129 ++hammer_stats_file_iopsr; 1130 1131 for (i = 0; i < nlen; ++i) { 1132 if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') { 1133 error = hammer_str_to_tid(ncp->nc_name + i + 2, 1134 &ispfs, &asof, &localization); 1135 if (error != 0) { 1136 i = nlen; 1137 break; 1138 } 1139 if (asof != HAMMER_MAX_TID) 1140 flags |= HAMMER_INODE_RO; 1141 break; 1142 } 1143 } 1144 nlen = i; 1145 1146 /* 1147 * If this is a PFS softlink we dive into the PFS 1148 */ 1149 if (ispfs && nlen == 0) { 1150 ip = hammer_get_inode(&trans, dip, HAMMER_OBJID_ROOT, 1151 asof, localization, 1152 flags, &error); 1153 if (error == 0) { 1154 error = hammer_get_vnode(ip, &vp); 1155 hammer_rel_inode(ip, 0); 1156 } else { 1157 vp = NULL; 1158 } 1159 if (error == 0) { 1160 vn_unlock(vp); 1161 cache_setvp(ap->a_nch, vp); 1162 vrele(vp); 1163 } 1164 goto done; 1165 } 1166 1167 /* 1168 * If there is no path component the time extension is relative to dip. 1169 * e.g. "fubar/@@<snapshot>" 1170 * 1171 * "." is handled by the kernel, but ".@@<snapshot>" is not. 1172 * e.g. "fubar/.@@<snapshot>" 1173 * 1174 * ".." is handled by the kernel. We do not currently handle 1175 * "..@<snapshot>". 1176 */ 1177 if (nlen == 0 || (nlen == 1 && ncp->nc_name[0] == '.')) { 1178 ip = hammer_get_inode(&trans, dip, dip->obj_id, 1179 asof, dip->obj_localization, 1180 flags, &error); 1181 if (error == 0) { 1182 error = hammer_get_vnode(ip, &vp); 1183 hammer_rel_inode(ip, 0); 1184 } else { 1185 vp = NULL; 1186 } 1187 if (error == 0) { 1188 vn_unlock(vp); 1189 cache_setvp(ap->a_nch, vp); 1190 vrele(vp); 1191 } 1192 goto done; 1193 } 1194 1195 /* 1196 * Calculate the namekey and setup the key range for the scan. This 1197 * works kinda like a chained hash table where the lower 32 bits 1198 * of the namekey synthesize the chain. 1199 * 1200 * The key range is inclusive of both key_beg and key_end. 1201 */ 1202 namekey = hammer_direntry_namekey(dip, ncp->nc_name, nlen, 1203 &max_iterations); 1204 1205 error = hammer_init_cursor(&trans, &cursor, &dip->cache[1], dip); 1206 cursor.key_beg.localization = dip->obj_localization | 1207 hammer_dir_localization(dip); 1208 cursor.key_beg.obj_id = dip->obj_id; 1209 cursor.key_beg.key = namekey; 1210 cursor.key_beg.create_tid = 0; 1211 cursor.key_beg.delete_tid = 0; 1212 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 1213 cursor.key_beg.obj_type = 0; 1214 1215 cursor.key_end = cursor.key_beg; 1216 cursor.key_end.key += max_iterations; 1217 cursor.asof = asof; 1218 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 1219 1220 /* 1221 * Scan all matching records (the chain), locate the one matching 1222 * the requested path component. 1223 * 1224 * The hammer_ip_*() functions merge in-memory records with on-disk 1225 * records for the purposes of the search. 1226 */ 1227 obj_id = 0; 1228 localization = HAMMER_DEF_LOCALIZATION; 1229 1230 if (error == 0) { 1231 error = hammer_ip_first(&cursor); 1232 while (error == 0) { 1233 error = hammer_ip_resolve_data(&cursor); 1234 if (error) 1235 break; 1236 if (nlen == cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF && 1237 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) { 1238 obj_id = cursor.data->entry.obj_id; 1239 localization = cursor.data->entry.localization; 1240 break; 1241 } 1242 error = hammer_ip_next(&cursor); 1243 } 1244 } 1245 hammer_done_cursor(&cursor); 1246 1247 /* 1248 * Lookup the obj_id. This should always succeed. If it does not 1249 * the filesystem may be damaged and we return a dummy inode. 1250 */ 1251 if (error == 0) { 1252 ip = hammer_get_inode(&trans, dip, obj_id, 1253 asof, localization, 1254 flags, &error); 1255 if (error == ENOENT) { 1256 hkprintf("WARNING: Missing inode for dirent \"%s\"\n" 1257 "\tobj_id = %016jx, asof=%016jx, lo=%08x\n", 1258 ncp->nc_name, 1259 (intmax_t)obj_id, (intmax_t)asof, 1260 localization); 1261 error = 0; 1262 ip = hammer_get_dummy_inode(&trans, dip, obj_id, 1263 asof, localization, 1264 flags, &error); 1265 } 1266 if (error == 0) { 1267 error = hammer_get_vnode(ip, &vp); 1268 hammer_rel_inode(ip, 0); 1269 } else { 1270 vp = NULL; 1271 } 1272 if (error == 0) { 1273 vn_unlock(vp); 1274 cache_setvp(ap->a_nch, vp); 1275 vrele(vp); 1276 } 1277 } else if (error == ENOENT) { 1278 cache_setvp(ap->a_nch, NULL); 1279 } 1280 done: 1281 hammer_done_transaction(&trans); 1282 lwkt_reltoken(&hmp->fs_token); 1283 return (error); 1284 } 1285 1286 /* 1287 * hammer_vop_nlookupdotdot { dvp, vpp, cred } 1288 * 1289 * Locate the parent directory of a directory vnode. 1290 * 1291 * dvp is referenced but not locked. *vpp must be returned referenced and 1292 * locked. A parent_obj_id of 0 indicates that we are at the root. 1293 * 1294 * NOTE: as-of sequences are not linked into the directory structure. If 1295 * we are at the root with a different asof then the mount point, reload 1296 * the same directory with the mount point's asof. I'm not sure what this 1297 * will do to NFS. We encode ASOF stamps in NFS file handles so it might not 1298 * get confused, but it hasn't been tested. 1299 */ 1300 static 1301 int 1302 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap) 1303 { 1304 struct hammer_transaction trans; 1305 hammer_inode_t dip; 1306 hammer_inode_t ip; 1307 hammer_mount_t hmp; 1308 int64_t parent_obj_id; 1309 uint32_t parent_obj_localization; 1310 hammer_tid_t asof; 1311 int error; 1312 1313 dip = VTOI(ap->a_dvp); 1314 asof = dip->obj_asof; 1315 hmp = dip->hmp; 1316 1317 /* 1318 * Whos are parent? This could be the root of a pseudo-filesystem 1319 * whos parent is in another localization domain. 1320 */ 1321 lwkt_gettoken(&hmp->fs_token); 1322 parent_obj_id = dip->ino_data.parent_obj_id; 1323 if (dip->obj_id == HAMMER_OBJID_ROOT) 1324 parent_obj_localization = HAMMER_DEF_LOCALIZATION; 1325 else 1326 parent_obj_localization = dip->obj_localization; 1327 1328 /* 1329 * It's probably a PFS root when dip->ino_data.parent_obj_id is 0. 1330 */ 1331 if (parent_obj_id == 0) { 1332 if (dip->obj_id == HAMMER_OBJID_ROOT && 1333 asof != hmp->asof) { 1334 parent_obj_id = dip->obj_id; 1335 asof = hmp->asof; 1336 *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK); 1337 ksnprintf(*ap->a_fakename, 19, "0x%016jx", 1338 (intmax_t)dip->obj_asof); 1339 } else { 1340 *ap->a_vpp = NULL; 1341 lwkt_reltoken(&hmp->fs_token); 1342 return ENOENT; 1343 } 1344 } 1345 1346 hammer_simple_transaction(&trans, hmp); 1347 ++hammer_stats_file_iopsr; 1348 1349 ip = hammer_get_inode(&trans, dip, parent_obj_id, 1350 asof, parent_obj_localization, 1351 dip->flags, &error); 1352 if (ip) { 1353 error = hammer_get_vnode(ip, ap->a_vpp); 1354 hammer_rel_inode(ip, 0); 1355 } else { 1356 *ap->a_vpp = NULL; 1357 } 1358 hammer_done_transaction(&trans); 1359 lwkt_reltoken(&hmp->fs_token); 1360 return (error); 1361 } 1362 1363 /* 1364 * hammer_vop_nlink { nch, dvp, vp, cred } 1365 */ 1366 static 1367 int 1368 hammer_vop_nlink(struct vop_nlink_args *ap) 1369 { 1370 struct hammer_transaction trans; 1371 hammer_inode_t dip; 1372 hammer_inode_t ip; 1373 struct nchandle *nch; 1374 hammer_mount_t hmp; 1375 int error; 1376 1377 if (ap->a_dvp->v_mount != ap->a_vp->v_mount) 1378 return(EXDEV); 1379 1380 nch = ap->a_nch; 1381 dip = VTOI(ap->a_dvp); 1382 ip = VTOI(ap->a_vp); 1383 hmp = dip->hmp; 1384 1385 if (dip->obj_localization != ip->obj_localization) 1386 return(EXDEV); 1387 1388 if (dip->flags & HAMMER_INODE_RO) 1389 return (EROFS); 1390 if (ip->flags & HAMMER_INODE_RO) 1391 return (EROFS); 1392 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1393 return (error); 1394 1395 /* 1396 * Create a transaction to cover the operations we perform. 1397 */ 1398 lwkt_gettoken(&hmp->fs_token); 1399 hammer_start_transaction(&trans, hmp); 1400 ++hammer_stats_file_iopsw; 1401 1402 /* 1403 * Add the filesystem object to the directory. Note that neither 1404 * dip nor ip are referenced or locked, but their vnodes are 1405 * referenced. This function will bump the inode's link count. 1406 */ 1407 error = hammer_ip_add_direntry(&trans, dip, 1408 nch->ncp->nc_name, nch->ncp->nc_nlen, 1409 ip); 1410 1411 /* 1412 * Finish up. 1413 */ 1414 if (error == 0) { 1415 cache_setunresolved(nch); 1416 cache_setvp(nch, ap->a_vp); 1417 } 1418 hammer_done_transaction(&trans); 1419 hammer_knote(ap->a_vp, NOTE_LINK); 1420 hammer_knote(ap->a_dvp, NOTE_WRITE); 1421 lwkt_reltoken(&hmp->fs_token); 1422 return (error); 1423 } 1424 1425 /* 1426 * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap } 1427 * 1428 * The operating system has already ensured that the directory entry 1429 * does not exist and done all appropriate namespace locking. 1430 */ 1431 static 1432 int 1433 hammer_vop_nmkdir(struct vop_nmkdir_args *ap) 1434 { 1435 struct hammer_transaction trans; 1436 hammer_inode_t dip; 1437 hammer_inode_t nip; 1438 struct nchandle *nch; 1439 hammer_mount_t hmp; 1440 int error; 1441 1442 nch = ap->a_nch; 1443 dip = VTOI(ap->a_dvp); 1444 hmp = dip->hmp; 1445 1446 if (dip->flags & HAMMER_INODE_RO) 1447 return (EROFS); 1448 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1449 return (error); 1450 1451 /* 1452 * Create a transaction to cover the operations we perform. 1453 */ 1454 lwkt_gettoken(&hmp->fs_token); 1455 hammer_start_transaction(&trans, hmp); 1456 ++hammer_stats_file_iopsw; 1457 1458 /* 1459 * Create a new filesystem object of the requested type. The 1460 * returned inode will be referenced but not locked. 1461 */ 1462 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 1463 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 1464 NULL, &nip); 1465 if (error) { 1466 hammer_done_transaction(&trans); 1467 *ap->a_vpp = NULL; 1468 lwkt_reltoken(&hmp->fs_token); 1469 return (error); 1470 } 1471 /* 1472 * Add the new filesystem object to the directory. This will also 1473 * bump the inode's link count. 1474 */ 1475 error = hammer_ip_add_direntry(&trans, dip, 1476 nch->ncp->nc_name, nch->ncp->nc_nlen, 1477 nip); 1478 if (error) 1479 hkprintf("hammer_mkdir (add) error %d\n", error); 1480 1481 /* 1482 * Finish up. 1483 */ 1484 if (error) { 1485 hammer_rel_inode(nip, 0); 1486 *ap->a_vpp = NULL; 1487 } else { 1488 error = hammer_get_vnode(nip, ap->a_vpp); 1489 hammer_rel_inode(nip, 0); 1490 if (error == 0) { 1491 cache_setunresolved(ap->a_nch); 1492 cache_setvp(ap->a_nch, *ap->a_vpp); 1493 } 1494 } 1495 hammer_done_transaction(&trans); 1496 if (error == 0) 1497 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1498 lwkt_reltoken(&hmp->fs_token); 1499 return (error); 1500 } 1501 1502 /* 1503 * hammer_vop_nmknod { nch, dvp, vpp, cred, vap } 1504 * 1505 * The operating system has already ensured that the directory entry 1506 * does not exist and done all appropriate namespace locking. 1507 */ 1508 static 1509 int 1510 hammer_vop_nmknod(struct vop_nmknod_args *ap) 1511 { 1512 struct hammer_transaction trans; 1513 hammer_inode_t dip; 1514 hammer_inode_t nip; 1515 struct nchandle *nch; 1516 hammer_mount_t hmp; 1517 int error; 1518 1519 nch = ap->a_nch; 1520 dip = VTOI(ap->a_dvp); 1521 hmp = dip->hmp; 1522 1523 if (dip->flags & HAMMER_INODE_RO) 1524 return (EROFS); 1525 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1526 return (error); 1527 1528 /* 1529 * Create a transaction to cover the operations we perform. 1530 */ 1531 lwkt_gettoken(&hmp->fs_token); 1532 hammer_start_transaction(&trans, hmp); 1533 ++hammer_stats_file_iopsw; 1534 1535 /* 1536 * Create a new filesystem object of the requested type. The 1537 * returned inode will be referenced but not locked. 1538 * 1539 * If mknod specifies a directory a pseudo-fs is created. 1540 */ 1541 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 1542 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 1543 NULL, &nip); 1544 if (error) { 1545 hammer_done_transaction(&trans); 1546 *ap->a_vpp = NULL; 1547 lwkt_reltoken(&hmp->fs_token); 1548 return (error); 1549 } 1550 1551 /* 1552 * Add the new filesystem object to the directory. This will also 1553 * bump the inode's link count. 1554 */ 1555 error = hammer_ip_add_direntry(&trans, dip, 1556 nch->ncp->nc_name, nch->ncp->nc_nlen, 1557 nip); 1558 1559 /* 1560 * Finish up. 1561 */ 1562 if (error) { 1563 hammer_rel_inode(nip, 0); 1564 *ap->a_vpp = NULL; 1565 } else { 1566 error = hammer_get_vnode(nip, ap->a_vpp); 1567 hammer_rel_inode(nip, 0); 1568 if (error == 0) { 1569 cache_setunresolved(ap->a_nch); 1570 cache_setvp(ap->a_nch, *ap->a_vpp); 1571 } 1572 } 1573 hammer_done_transaction(&trans); 1574 if (error == 0) 1575 hammer_knote(ap->a_dvp, NOTE_WRITE); 1576 lwkt_reltoken(&hmp->fs_token); 1577 return (error); 1578 } 1579 1580 /* 1581 * hammer_vop_open { vp, mode, cred, fp } 1582 * 1583 * MPSAFE (does not require fs_token) 1584 */ 1585 static 1586 int 1587 hammer_vop_open(struct vop_open_args *ap) 1588 { 1589 hammer_inode_t ip; 1590 1591 ++hammer_stats_file_iopsr; 1592 ip = VTOI(ap->a_vp); 1593 1594 if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO)) 1595 return (EROFS); 1596 return(vop_stdopen(ap)); 1597 } 1598 1599 /* 1600 * hammer_vop_print { vp } 1601 */ 1602 static 1603 int 1604 hammer_vop_print(struct vop_print_args *ap) 1605 { 1606 return EOPNOTSUPP; 1607 } 1608 1609 /* 1610 * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies } 1611 */ 1612 static 1613 int 1614 hammer_vop_readdir(struct vop_readdir_args *ap) 1615 { 1616 struct hammer_transaction trans; 1617 struct hammer_cursor cursor; 1618 hammer_inode_t ip; 1619 hammer_mount_t hmp; 1620 struct uio *uio; 1621 hammer_base_elm_t base; 1622 int error; 1623 int cookie_index; 1624 int ncookies; 1625 off_t *cookies; 1626 off_t saveoff; 1627 int r; 1628 int dtype; 1629 1630 ++hammer_stats_file_iopsr; 1631 ip = VTOI(ap->a_vp); 1632 uio = ap->a_uio; 1633 saveoff = uio->uio_offset; 1634 hmp = ip->hmp; 1635 1636 if (ap->a_ncookies) { 1637 ncookies = uio->uio_resid / 16 + 1; 1638 if (ncookies > 1024) 1639 ncookies = 1024; 1640 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 1641 cookie_index = 0; 1642 } else { 1643 ncookies = -1; 1644 cookies = NULL; 1645 cookie_index = 0; 1646 } 1647 1648 lwkt_gettoken(&hmp->fs_token); 1649 hammer_simple_transaction(&trans, hmp); 1650 1651 /* 1652 * Handle artificial entries 1653 * 1654 * It should be noted that the minimum value for a directory 1655 * hash key on-media is 0x0000000100000000, so we can use anything 1656 * less then that to represent our 'special' key space. 1657 */ 1658 error = 0; 1659 if (saveoff == 0) { 1660 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, "."); 1661 if (r) 1662 goto done; 1663 if (cookies) 1664 cookies[cookie_index] = saveoff; 1665 ++saveoff; 1666 ++cookie_index; 1667 if (cookie_index == ncookies) 1668 goto done; 1669 } 1670 if (saveoff == 1) { 1671 if (ip->ino_data.parent_obj_id) { 1672 r = vop_write_dirent(&error, uio, 1673 ip->ino_data.parent_obj_id, 1674 DT_DIR, 2, ".."); 1675 } else { 1676 r = vop_write_dirent(&error, uio, 1677 ip->obj_id, DT_DIR, 2, ".."); 1678 } 1679 if (r) 1680 goto done; 1681 if (cookies) 1682 cookies[cookie_index] = saveoff; 1683 ++saveoff; 1684 ++cookie_index; 1685 if (cookie_index == ncookies) 1686 goto done; 1687 } 1688 1689 /* 1690 * Key range (begin and end inclusive) to scan. Directory keys 1691 * directly translate to a 64 bit 'seek' position. 1692 */ 1693 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 1694 cursor.key_beg.localization = ip->obj_localization | 1695 hammer_dir_localization(ip); 1696 cursor.key_beg.obj_id = ip->obj_id; 1697 cursor.key_beg.create_tid = 0; 1698 cursor.key_beg.delete_tid = 0; 1699 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 1700 cursor.key_beg.obj_type = 0; 1701 cursor.key_beg.key = saveoff; 1702 1703 cursor.key_end = cursor.key_beg; 1704 cursor.key_end.key = HAMMER_MAX_KEY; 1705 cursor.asof = ip->obj_asof; 1706 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 1707 1708 error = hammer_ip_first(&cursor); 1709 1710 while (error == 0) { 1711 error = hammer_ip_resolve_data(&cursor); 1712 if (error) 1713 break; 1714 base = &cursor.leaf->base; 1715 saveoff = base->key; 1716 KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF); 1717 1718 if (base->obj_id != ip->obj_id) 1719 hpanic("bad record at %p", cursor.node); 1720 1721 dtype = hammer_get_dtype(cursor.leaf->base.obj_type); 1722 r = vop_write_dirent( 1723 &error, uio, cursor.data->entry.obj_id, 1724 dtype, 1725 cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF , 1726 (void *)cursor.data->entry.name); 1727 if (r) 1728 break; 1729 ++saveoff; 1730 if (cookies) 1731 cookies[cookie_index] = base->key; 1732 ++cookie_index; 1733 if (cookie_index == ncookies) 1734 break; 1735 error = hammer_ip_next(&cursor); 1736 } 1737 hammer_done_cursor(&cursor); 1738 1739 done: 1740 hammer_done_transaction(&trans); 1741 1742 if (ap->a_eofflag) 1743 *ap->a_eofflag = (error == ENOENT); 1744 uio->uio_offset = saveoff; 1745 if (error && cookie_index == 0) { 1746 if (error == ENOENT) 1747 error = 0; 1748 if (cookies) { 1749 kfree(cookies, M_TEMP); 1750 *ap->a_ncookies = 0; 1751 *ap->a_cookies = NULL; 1752 } 1753 } else { 1754 if (error == ENOENT) 1755 error = 0; 1756 if (cookies) { 1757 *ap->a_ncookies = cookie_index; 1758 *ap->a_cookies = cookies; 1759 } 1760 } 1761 lwkt_reltoken(&hmp->fs_token); 1762 return(error); 1763 } 1764 1765 /* 1766 * hammer_vop_readlink { vp, uio, cred } 1767 */ 1768 static 1769 int 1770 hammer_vop_readlink(struct vop_readlink_args *ap) 1771 { 1772 struct hammer_transaction trans; 1773 struct hammer_cursor cursor; 1774 hammer_inode_t ip; 1775 hammer_mount_t hmp; 1776 char buf[32]; 1777 uint32_t localization; 1778 hammer_pseudofs_inmem_t pfsm; 1779 int error; 1780 1781 ip = VTOI(ap->a_vp); 1782 hmp = ip->hmp; 1783 1784 lwkt_gettoken(&hmp->fs_token); 1785 1786 /* 1787 * Shortcut if the symlink data was stuffed into ino_data. 1788 * 1789 * Also expand special "@@PFS%05d" softlinks (expansion only 1790 * occurs for non-historical (current) accesses made from the 1791 * primary filesystem). 1792 * 1793 * Note that userspace hammer command does not allow users to 1794 * create a @@PFS softlink under an existing other PFS (id!=0) 1795 * so the ip localization here for @@PFS softlink is always 0. 1796 */ 1797 if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) { 1798 char *ptr; 1799 int bytes; 1800 1801 ptr = ip->ino_data.ext.symlink; 1802 bytes = (int)ip->ino_data.size; 1803 if (bytes == 10 && 1804 ip->obj_asof == HAMMER_MAX_TID && 1805 ip->obj_localization == HAMMER_DEF_LOCALIZATION && 1806 strncmp(ptr, "@@PFS", 5) == 0) { 1807 hammer_simple_transaction(&trans, hmp); 1808 bcopy(ptr + 5, buf, 5); 1809 buf[5] = 0; 1810 localization = pfs_to_lo(strtoul(buf, NULL, 10)); 1811 pfsm = hammer_load_pseudofs(&trans, localization, 1812 &error); 1813 if (error == 0) { 1814 if (hammer_is_pfs_slave(&pfsm->pfsd)) { 1815 /* vap->va_size == 26 */ 1816 ksnprintf(buf, sizeof(buf), 1817 "@@0x%016jx:%05d", 1818 (intmax_t)pfsm->pfsd.sync_end_tid, 1819 lo_to_pfs(localization)); 1820 } else { 1821 /* vap->va_size == 10 */ 1822 ksnprintf(buf, sizeof(buf), 1823 "@@-1:%05d", 1824 lo_to_pfs(localization)); 1825 } 1826 ptr = buf; 1827 bytes = strlen(buf); 1828 } 1829 if (pfsm) 1830 hammer_rel_pseudofs(hmp, pfsm); 1831 hammer_done_transaction(&trans); 1832 } 1833 error = uiomove(ptr, bytes, ap->a_uio); 1834 lwkt_reltoken(&hmp->fs_token); 1835 return(error); 1836 } 1837 1838 /* 1839 * Long version 1840 */ 1841 hammer_simple_transaction(&trans, hmp); 1842 ++hammer_stats_file_iopsr; 1843 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 1844 1845 /* 1846 * Key range (begin and end inclusive) to scan. Directory keys 1847 * directly translate to a 64 bit 'seek' position. 1848 */ 1849 cursor.key_beg.localization = ip->obj_localization | 1850 HAMMER_LOCALIZE_MISC; 1851 cursor.key_beg.obj_id = ip->obj_id; 1852 cursor.key_beg.create_tid = 0; 1853 cursor.key_beg.delete_tid = 0; 1854 cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX; 1855 cursor.key_beg.obj_type = 0; 1856 cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK; 1857 cursor.asof = ip->obj_asof; 1858 cursor.flags |= HAMMER_CURSOR_ASOF; 1859 1860 error = hammer_ip_lookup(&cursor); 1861 if (error == 0) { 1862 error = hammer_ip_resolve_data(&cursor); 1863 if (error == 0) { 1864 KKASSERT(cursor.leaf->data_len >= 1865 HAMMER_SYMLINK_NAME_OFF); 1866 error = uiomove(cursor.data->symlink.name, 1867 cursor.leaf->data_len - 1868 HAMMER_SYMLINK_NAME_OFF, 1869 ap->a_uio); 1870 } 1871 } 1872 hammer_done_cursor(&cursor); 1873 hammer_done_transaction(&trans); 1874 lwkt_reltoken(&hmp->fs_token); 1875 return(error); 1876 } 1877 1878 /* 1879 * hammer_vop_nremove { nch, dvp, cred } 1880 */ 1881 static 1882 int 1883 hammer_vop_nremove(struct vop_nremove_args *ap) 1884 { 1885 struct hammer_transaction trans; 1886 hammer_inode_t dip; 1887 hammer_mount_t hmp; 1888 int error; 1889 1890 dip = VTOI(ap->a_dvp); 1891 hmp = dip->hmp; 1892 1893 if (hammer_nohistory(dip) == 0 && 1894 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 1895 return (error); 1896 } 1897 1898 lwkt_gettoken(&hmp->fs_token); 1899 hammer_start_transaction(&trans, hmp); 1900 ++hammer_stats_file_iopsw; 1901 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 0); 1902 hammer_done_transaction(&trans); 1903 if (error == 0) 1904 hammer_knote(ap->a_dvp, NOTE_WRITE); 1905 lwkt_reltoken(&hmp->fs_token); 1906 return (error); 1907 } 1908 1909 /* 1910 * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred } 1911 */ 1912 static 1913 int 1914 hammer_vop_nrename(struct vop_nrename_args *ap) 1915 { 1916 struct hammer_transaction trans; 1917 struct namecache *fncp; 1918 struct namecache *tncp; 1919 hammer_inode_t fdip; 1920 hammer_inode_t tdip; 1921 hammer_inode_t ip; 1922 hammer_mount_t hmp; 1923 struct hammer_cursor cursor; 1924 int64_t namekey; 1925 uint32_t max_iterations; 1926 int nlen, error; 1927 1928 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount) 1929 return(EXDEV); 1930 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount) 1931 return(EXDEV); 1932 1933 fdip = VTOI(ap->a_fdvp); 1934 tdip = VTOI(ap->a_tdvp); 1935 fncp = ap->a_fnch->ncp; 1936 tncp = ap->a_tnch->ncp; 1937 ip = VTOI(fncp->nc_vp); 1938 KKASSERT(ip != NULL); 1939 1940 hmp = ip->hmp; 1941 1942 if (fdip->obj_localization != tdip->obj_localization) 1943 return(EXDEV); 1944 if (fdip->obj_localization != ip->obj_localization) 1945 return(EXDEV); 1946 1947 if (fdip->flags & HAMMER_INODE_RO) 1948 return (EROFS); 1949 if (tdip->flags & HAMMER_INODE_RO) 1950 return (EROFS); 1951 if (ip->flags & HAMMER_INODE_RO) 1952 return (EROFS); 1953 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1954 return (error); 1955 1956 lwkt_gettoken(&hmp->fs_token); 1957 hammer_start_transaction(&trans, hmp); 1958 ++hammer_stats_file_iopsw; 1959 1960 /* 1961 * Remove tncp from the target directory and then link ip as 1962 * tncp. XXX pass trans to dounlink 1963 * 1964 * Force the inode sync-time to match the transaction so it is 1965 * in-sync with the creation of the target directory entry. 1966 */ 1967 error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp, 1968 ap->a_cred, 0, -1); 1969 if (error == 0 || error == ENOENT) { 1970 error = hammer_ip_add_direntry(&trans, tdip, 1971 tncp->nc_name, tncp->nc_nlen, 1972 ip); 1973 if (error == 0) { 1974 ip->ino_data.parent_obj_id = tdip->obj_id; 1975 ip->ino_data.ctime = trans.time; 1976 hammer_modify_inode(&trans, ip, HAMMER_INODE_DDIRTY); 1977 } 1978 } 1979 if (error) 1980 goto failed; /* XXX */ 1981 1982 /* 1983 * Locate the record in the originating directory and remove it. 1984 * 1985 * Calculate the namekey and setup the key range for the scan. This 1986 * works kinda like a chained hash table where the lower 32 bits 1987 * of the namekey synthesize the chain. 1988 * 1989 * The key range is inclusive of both key_beg and key_end. 1990 */ 1991 namekey = hammer_direntry_namekey(fdip, fncp->nc_name, fncp->nc_nlen, 1992 &max_iterations); 1993 retry: 1994 hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip); 1995 cursor.key_beg.localization = fdip->obj_localization | 1996 hammer_dir_localization(fdip); 1997 cursor.key_beg.obj_id = fdip->obj_id; 1998 cursor.key_beg.key = namekey; 1999 cursor.key_beg.create_tid = 0; 2000 cursor.key_beg.delete_tid = 0; 2001 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 2002 cursor.key_beg.obj_type = 0; 2003 2004 cursor.key_end = cursor.key_beg; 2005 cursor.key_end.key += max_iterations; 2006 cursor.asof = fdip->obj_asof; 2007 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 2008 2009 /* 2010 * Scan all matching records (the chain), locate the one matching 2011 * the requested path component. 2012 * 2013 * The hammer_ip_*() functions merge in-memory records with on-disk 2014 * records for the purposes of the search. 2015 */ 2016 error = hammer_ip_first(&cursor); 2017 while (error == 0) { 2018 if (hammer_ip_resolve_data(&cursor) != 0) 2019 break; 2020 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF; 2021 KKASSERT(nlen > 0); 2022 if (fncp->nc_nlen == nlen && 2023 bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) { 2024 break; 2025 } 2026 error = hammer_ip_next(&cursor); 2027 } 2028 2029 /* 2030 * If all is ok we have to get the inode so we can adjust nlinks. 2031 * 2032 * WARNING: hammer_ip_del_direntry() may have to terminate the 2033 * cursor to avoid a recursion. It's ok to call hammer_done_cursor() 2034 * twice. 2035 */ 2036 if (error == 0) 2037 error = hammer_ip_del_direntry(&trans, &cursor, fdip, ip); 2038 2039 /* 2040 * XXX A deadlock here will break rename's atomicy for the purposes 2041 * of crash recovery. 2042 */ 2043 if (error == EDEADLK) { 2044 hammer_done_cursor(&cursor); 2045 goto retry; 2046 } 2047 2048 /* 2049 * Cleanup and tell the kernel that the rename succeeded. 2050 * 2051 * NOTE: ip->vp, if non-NULL, cannot be directly referenced 2052 * without formally acquiring the vp since the vp might 2053 * have zero refs on it, or in the middle of a reclaim, 2054 * etc. 2055 */ 2056 hammer_done_cursor(&cursor); 2057 if (error == 0) { 2058 cache_rename(ap->a_fnch, ap->a_tnch); 2059 hammer_knote(ap->a_fdvp, NOTE_WRITE); 2060 hammer_knote(ap->a_tdvp, NOTE_WRITE); 2061 while (ip->vp) { 2062 struct vnode *vp; 2063 2064 error = hammer_get_vnode(ip, &vp); 2065 if (error == 0 && vp) { 2066 vn_unlock(vp); 2067 hammer_knote(ip->vp, NOTE_RENAME); 2068 vrele(vp); 2069 break; 2070 } 2071 hdkprintf("ip/vp race2 avoided\n"); 2072 } 2073 } 2074 2075 failed: 2076 hammer_done_transaction(&trans); 2077 lwkt_reltoken(&hmp->fs_token); 2078 return (error); 2079 } 2080 2081 /* 2082 * hammer_vop_nrmdir { nch, dvp, cred } 2083 */ 2084 static 2085 int 2086 hammer_vop_nrmdir(struct vop_nrmdir_args *ap) 2087 { 2088 struct hammer_transaction trans; 2089 hammer_inode_t dip; 2090 hammer_mount_t hmp; 2091 int error; 2092 2093 dip = VTOI(ap->a_dvp); 2094 hmp = dip->hmp; 2095 2096 if (hammer_nohistory(dip) == 0 && 2097 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 2098 return (error); 2099 } 2100 2101 lwkt_gettoken(&hmp->fs_token); 2102 hammer_start_transaction(&trans, hmp); 2103 ++hammer_stats_file_iopsw; 2104 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 1); 2105 hammer_done_transaction(&trans); 2106 if (error == 0) 2107 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 2108 lwkt_reltoken(&hmp->fs_token); 2109 return (error); 2110 } 2111 2112 /* 2113 * hammer_vop_markatime { vp, cred } 2114 */ 2115 static 2116 int 2117 hammer_vop_markatime(struct vop_markatime_args *ap) 2118 { 2119 struct hammer_transaction trans; 2120 hammer_inode_t ip; 2121 hammer_mount_t hmp; 2122 2123 ip = VTOI(ap->a_vp); 2124 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 2125 return (EROFS); 2126 if (ip->flags & HAMMER_INODE_RO) 2127 return (EROFS); 2128 hmp = ip->hmp; 2129 if (hmp->mp->mnt_flag & MNT_NOATIME) 2130 return (0); 2131 lwkt_gettoken(&hmp->fs_token); 2132 hammer_start_transaction(&trans, hmp); 2133 ++hammer_stats_file_iopsw; 2134 2135 ip->ino_data.atime = trans.time; 2136 hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME); 2137 hammer_done_transaction(&trans); 2138 hammer_knote(ap->a_vp, NOTE_ATTRIB); 2139 lwkt_reltoken(&hmp->fs_token); 2140 return (0); 2141 } 2142 2143 /* 2144 * hammer_vop_setattr { vp, vap, cred } 2145 */ 2146 static 2147 int 2148 hammer_vop_setattr(struct vop_setattr_args *ap) 2149 { 2150 struct hammer_transaction trans; 2151 hammer_inode_t ip; 2152 struct vattr *vap; 2153 hammer_mount_t hmp; 2154 int modflags; 2155 int error; 2156 int truncating; 2157 int blksize; 2158 int kflags; 2159 #if 0 2160 int64_t aligned_size; 2161 #endif 2162 uint32_t flags; 2163 2164 vap = ap->a_vap; 2165 ip = ap->a_vp->v_data; 2166 modflags = 0; 2167 kflags = 0; 2168 hmp = ip->hmp; 2169 2170 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 2171 return(EROFS); 2172 if (ip->flags & HAMMER_INODE_RO) 2173 return (EROFS); 2174 if (hammer_nohistory(ip) == 0 && 2175 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 2176 return (error); 2177 } 2178 2179 lwkt_gettoken(&hmp->fs_token); 2180 hammer_start_transaction(&trans, hmp); 2181 ++hammer_stats_file_iopsw; 2182 error = 0; 2183 2184 if (vap->va_flags != VNOVAL) { 2185 flags = ip->ino_data.uflags; 2186 error = vop_helper_setattr_flags(&flags, vap->va_flags, 2187 hammer_to_unix_xid(&ip->ino_data.uid), 2188 ap->a_cred); 2189 if (error == 0) { 2190 if (ip->ino_data.uflags != flags) { 2191 ip->ino_data.uflags = flags; 2192 ip->ino_data.ctime = trans.time; 2193 modflags |= HAMMER_INODE_DDIRTY; 2194 kflags |= NOTE_ATTRIB; 2195 } 2196 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) { 2197 error = 0; 2198 goto done; 2199 } 2200 } 2201 goto done; 2202 } 2203 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) { 2204 error = EPERM; 2205 goto done; 2206 } 2207 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 2208 mode_t cur_mode = ip->ino_data.mode; 2209 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid); 2210 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid); 2211 uuid_t uuid_uid; 2212 uuid_t uuid_gid; 2213 2214 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid, 2215 ap->a_cred, 2216 &cur_uid, &cur_gid, &cur_mode); 2217 if (error == 0) { 2218 hammer_guid_to_uuid(&uuid_uid, cur_uid); 2219 hammer_guid_to_uuid(&uuid_gid, cur_gid); 2220 if (bcmp(&uuid_uid, &ip->ino_data.uid, 2221 sizeof(uuid_uid)) || 2222 bcmp(&uuid_gid, &ip->ino_data.gid, 2223 sizeof(uuid_gid)) || 2224 ip->ino_data.mode != cur_mode) { 2225 ip->ino_data.uid = uuid_uid; 2226 ip->ino_data.gid = uuid_gid; 2227 ip->ino_data.mode = cur_mode; 2228 ip->ino_data.ctime = trans.time; 2229 modflags |= HAMMER_INODE_DDIRTY; 2230 } 2231 kflags |= NOTE_ATTRIB; 2232 } 2233 } 2234 while (vap->va_size != VNOVAL && ip->ino_data.size != vap->va_size) { 2235 switch(ap->a_vp->v_type) { 2236 case VREG: 2237 if (vap->va_size == ip->ino_data.size) 2238 break; 2239 2240 /* 2241 * Log the operation if in fast-fsync mode or if 2242 * there are unterminated redo write records present. 2243 * 2244 * The second check is needed so the recovery code 2245 * properly truncates write redos even if nominal 2246 * REDO operations is turned off due to excessive 2247 * writes, because the related records might be 2248 * destroyed and never lay down a TERM_WRITE. 2249 */ 2250 if ((ip->flags & HAMMER_INODE_REDO) || 2251 (ip->flags & HAMMER_INODE_RDIRTY)) { 2252 error = hammer_generate_redo(&trans, ip, 2253 vap->va_size, 2254 HAMMER_REDO_TRUNC, 2255 NULL, 0); 2256 } 2257 blksize = hammer_blocksize(vap->va_size); 2258 2259 /* 2260 * XXX break atomicy, we can deadlock the backend 2261 * if we do not release the lock. Probably not a 2262 * big deal here. 2263 */ 2264 if (vap->va_size < ip->ino_data.size) { 2265 nvtruncbuf(ap->a_vp, vap->va_size, 2266 blksize, 2267 hammer_blockoff(vap->va_size), 2268 0); 2269 truncating = 1; 2270 kflags |= NOTE_WRITE; 2271 } else { 2272 nvextendbuf(ap->a_vp, 2273 ip->ino_data.size, 2274 vap->va_size, 2275 hammer_blocksize(ip->ino_data.size), 2276 hammer_blocksize(vap->va_size), 2277 hammer_blockoff(ip->ino_data.size), 2278 hammer_blockoff(vap->va_size), 2279 0); 2280 truncating = 0; 2281 kflags |= NOTE_WRITE | NOTE_EXTEND; 2282 } 2283 ip->ino_data.size = vap->va_size; 2284 ip->ino_data.mtime = trans.time; 2285 /* XXX safe to use SDIRTY instead of DDIRTY here? */ 2286 modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY; 2287 2288 /* 2289 * On-media truncation is cached in the inode until 2290 * the inode is synchronized. We must immediately 2291 * handle any frontend records. 2292 */ 2293 if (truncating) { 2294 hammer_ip_frontend_trunc(ip, vap->va_size); 2295 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) { 2296 ip->flags |= HAMMER_INODE_TRUNCATED; 2297 ip->trunc_off = vap->va_size; 2298 hammer_inode_dirty(ip); 2299 } else if (ip->trunc_off > vap->va_size) { 2300 ip->trunc_off = vap->va_size; 2301 } 2302 } 2303 2304 #if 0 2305 /* 2306 * When truncating, nvtruncbuf() may have cleaned out 2307 * a portion of the last block on-disk in the buffer 2308 * cache. We must clean out any frontend records 2309 * for blocks beyond the new last block. 2310 */ 2311 aligned_size = (vap->va_size + (blksize - 1)) & 2312 ~(int64_t)(blksize - 1); 2313 if (truncating && vap->va_size < aligned_size) { 2314 aligned_size -= blksize; 2315 hammer_ip_frontend_trunc(ip, aligned_size); 2316 } 2317 #endif 2318 break; 2319 case VDATABASE: 2320 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) { 2321 ip->flags |= HAMMER_INODE_TRUNCATED; 2322 ip->trunc_off = vap->va_size; 2323 hammer_inode_dirty(ip); 2324 } else if (ip->trunc_off > vap->va_size) { 2325 ip->trunc_off = vap->va_size; 2326 } 2327 hammer_ip_frontend_trunc(ip, vap->va_size); 2328 ip->ino_data.size = vap->va_size; 2329 ip->ino_data.mtime = trans.time; 2330 modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY; 2331 kflags |= NOTE_ATTRIB; 2332 break; 2333 default: 2334 error = EINVAL; 2335 goto done; 2336 } 2337 break; 2338 } 2339 if (vap->va_atime.tv_sec != VNOVAL) { 2340 ip->ino_data.atime = hammer_timespec_to_time(&vap->va_atime); 2341 modflags |= HAMMER_INODE_ATIME; 2342 kflags |= NOTE_ATTRIB; 2343 } 2344 if (vap->va_mtime.tv_sec != VNOVAL) { 2345 ip->ino_data.mtime = hammer_timespec_to_time(&vap->va_mtime); 2346 modflags |= HAMMER_INODE_MTIME; 2347 kflags |= NOTE_ATTRIB; 2348 } 2349 if (vap->va_mode != (mode_t)VNOVAL) { 2350 mode_t cur_mode = ip->ino_data.mode; 2351 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid); 2352 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid); 2353 2354 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred, 2355 cur_uid, cur_gid, &cur_mode); 2356 if (error == 0 && ip->ino_data.mode != cur_mode) { 2357 ip->ino_data.mode = cur_mode; 2358 ip->ino_data.ctime = trans.time; 2359 modflags |= HAMMER_INODE_DDIRTY; 2360 kflags |= NOTE_ATTRIB; 2361 } 2362 } 2363 done: 2364 if (error == 0) 2365 hammer_modify_inode(&trans, ip, modflags); 2366 hammer_done_transaction(&trans); 2367 hammer_knote(ap->a_vp, kflags); 2368 lwkt_reltoken(&hmp->fs_token); 2369 return (error); 2370 } 2371 2372 /* 2373 * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target } 2374 */ 2375 static 2376 int 2377 hammer_vop_nsymlink(struct vop_nsymlink_args *ap) 2378 { 2379 struct hammer_transaction trans; 2380 hammer_inode_t dip; 2381 hammer_inode_t nip; 2382 hammer_record_t record; 2383 struct nchandle *nch; 2384 hammer_mount_t hmp; 2385 int error; 2386 int bytes; 2387 2388 ap->a_vap->va_type = VLNK; 2389 2390 nch = ap->a_nch; 2391 dip = VTOI(ap->a_dvp); 2392 hmp = dip->hmp; 2393 2394 if (dip->flags & HAMMER_INODE_RO) 2395 return (EROFS); 2396 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 2397 return (error); 2398 2399 /* 2400 * Create a transaction to cover the operations we perform. 2401 */ 2402 lwkt_gettoken(&hmp->fs_token); 2403 hammer_start_transaction(&trans, hmp); 2404 ++hammer_stats_file_iopsw; 2405 2406 /* 2407 * Create a new filesystem object of the requested type. The 2408 * returned inode will be referenced but not locked. 2409 */ 2410 2411 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 2412 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 2413 NULL, &nip); 2414 if (error) { 2415 hammer_done_transaction(&trans); 2416 *ap->a_vpp = NULL; 2417 lwkt_reltoken(&hmp->fs_token); 2418 return (error); 2419 } 2420 2421 /* 2422 * Add a record representing the symlink. symlink stores the link 2423 * as pure data, not a string, and is no \0 terminated. 2424 */ 2425 if (error == 0) { 2426 bytes = strlen(ap->a_target); 2427 2428 if (bytes <= HAMMER_INODE_BASESYMLEN) { 2429 bcopy(ap->a_target, nip->ino_data.ext.symlink, bytes); 2430 } else { 2431 record = hammer_alloc_mem_record(nip, bytes); 2432 record->type = HAMMER_MEM_RECORD_GENERAL; 2433 2434 record->leaf.base.localization = nip->obj_localization | 2435 HAMMER_LOCALIZE_MISC; 2436 record->leaf.base.key = HAMMER_FIXKEY_SYMLINK; 2437 record->leaf.base.rec_type = HAMMER_RECTYPE_FIX; 2438 record->leaf.data_len = bytes; 2439 KKASSERT(HAMMER_SYMLINK_NAME_OFF == 0); 2440 bcopy(ap->a_target, record->data->symlink.name, bytes); 2441 error = hammer_ip_add_record(&trans, record); 2442 } 2443 2444 /* 2445 * Set the file size to the length of the link. 2446 */ 2447 if (error == 0) { 2448 nip->ino_data.size = bytes; 2449 hammer_modify_inode(&trans, nip, HAMMER_INODE_DDIRTY); 2450 } 2451 } 2452 if (error == 0) 2453 error = hammer_ip_add_direntry(&trans, dip, nch->ncp->nc_name, 2454 nch->ncp->nc_nlen, nip); 2455 2456 /* 2457 * Finish up. 2458 */ 2459 if (error) { 2460 hammer_rel_inode(nip, 0); 2461 *ap->a_vpp = NULL; 2462 } else { 2463 error = hammer_get_vnode(nip, ap->a_vpp); 2464 hammer_rel_inode(nip, 0); 2465 if (error == 0) { 2466 cache_setunresolved(ap->a_nch); 2467 cache_setvp(ap->a_nch, *ap->a_vpp); 2468 hammer_knote(ap->a_dvp, NOTE_WRITE); 2469 } 2470 } 2471 hammer_done_transaction(&trans); 2472 lwkt_reltoken(&hmp->fs_token); 2473 return (error); 2474 } 2475 2476 /* 2477 * hammer_vop_nwhiteout { nch, dvp, cred, flags } 2478 */ 2479 static 2480 int 2481 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap) 2482 { 2483 struct hammer_transaction trans; 2484 hammer_inode_t dip; 2485 hammer_mount_t hmp; 2486 int error; 2487 2488 dip = VTOI(ap->a_dvp); 2489 hmp = dip->hmp; 2490 2491 if (hammer_nohistory(dip) == 0 && 2492 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) { 2493 return (error); 2494 } 2495 2496 lwkt_gettoken(&hmp->fs_token); 2497 hammer_start_transaction(&trans, hmp); 2498 ++hammer_stats_file_iopsw; 2499 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, 2500 ap->a_cred, ap->a_flags, -1); 2501 hammer_done_transaction(&trans); 2502 lwkt_reltoken(&hmp->fs_token); 2503 2504 return (error); 2505 } 2506 2507 /* 2508 * hammer_vop_ioctl { vp, command, data, fflag, cred } 2509 */ 2510 static 2511 int 2512 hammer_vop_ioctl(struct vop_ioctl_args *ap) 2513 { 2514 hammer_inode_t ip = ap->a_vp->v_data; 2515 hammer_mount_t hmp = ip->hmp; 2516 int error; 2517 2518 ++hammer_stats_file_iopsr; 2519 lwkt_gettoken(&hmp->fs_token); 2520 error = hammer_ioctl(ip, ap->a_command, ap->a_data, 2521 ap->a_fflag, ap->a_cred); 2522 lwkt_reltoken(&hmp->fs_token); 2523 return (error); 2524 } 2525 2526 static 2527 int 2528 hammer_vop_mountctl(struct vop_mountctl_args *ap) 2529 { 2530 static const struct mountctl_opt extraopt[] = { 2531 { HMNT_NOHISTORY, "nohistory" }, 2532 { HMNT_MASTERID, "master" }, 2533 { HMNT_NOMIRROR, "nomirror" }, 2534 { 0, NULL} 2535 2536 }; 2537 hammer_mount_t hmp; 2538 struct mount *mp; 2539 int usedbytes; 2540 int error; 2541 2542 error = 0; 2543 usedbytes = 0; 2544 mp = ap->a_head.a_ops->head.vv_mount; 2545 KKASSERT(mp->mnt_data != NULL); 2546 hmp = (hammer_mount_t)mp->mnt_data; 2547 2548 lwkt_gettoken(&hmp->fs_token); 2549 2550 switch(ap->a_op) { 2551 case MOUNTCTL_SET_EXPORT: 2552 if (ap->a_ctllen != sizeof(struct export_args)) 2553 error = EINVAL; 2554 else 2555 error = hammer_vfs_export(mp, ap->a_op, 2556 (const struct export_args *)ap->a_ctl); 2557 break; 2558 case MOUNTCTL_MOUNTFLAGS: 2559 /* 2560 * Call standard mountctl VOP function 2561 * so we get user mount flags. 2562 */ 2563 error = vop_stdmountctl(ap); 2564 if (error) 2565 break; 2566 2567 usedbytes = *ap->a_res; 2568 2569 if (usedbytes > 0 && usedbytes < ap->a_buflen) { 2570 usedbytes += vfs_flagstostr(hmp->hflags, extraopt, 2571 ap->a_buf, 2572 ap->a_buflen - usedbytes, 2573 &error); 2574 } 2575 2576 *ap->a_res += usedbytes; 2577 break; 2578 default: 2579 error = vop_stdmountctl(ap); 2580 break; 2581 } 2582 lwkt_reltoken(&hmp->fs_token); 2583 return(error); 2584 } 2585 2586 /* 2587 * hammer_vop_strategy { vp, bio } 2588 * 2589 * Strategy call, used for regular file read & write only. Note that the 2590 * bp may represent a cluster. 2591 * 2592 * To simplify operation and allow better optimizations in the future, 2593 * this code does not make any assumptions with regards to buffer alignment 2594 * or size. 2595 */ 2596 static 2597 int 2598 hammer_vop_strategy(struct vop_strategy_args *ap) 2599 { 2600 struct buf *bp; 2601 int error; 2602 2603 bp = ap->a_bio->bio_buf; 2604 2605 switch(bp->b_cmd) { 2606 case BUF_CMD_READ: 2607 error = hammer_vop_strategy_read(ap); 2608 break; 2609 case BUF_CMD_WRITE: 2610 error = hammer_vop_strategy_write(ap); 2611 break; 2612 default: 2613 bp->b_error = error = EINVAL; 2614 bp->b_flags |= B_ERROR; 2615 biodone(ap->a_bio); 2616 break; 2617 } 2618 2619 /* hammer_dump_dedup_cache(((hammer_inode_t)ap->a_vp->v_data)->hmp); */ 2620 2621 return (error); 2622 } 2623 2624 /* 2625 * Read from a regular file. Iterate the related records and fill in the 2626 * BIO/BUF. Gaps are zero-filled. 2627 * 2628 * The support code in hammer_object.c should be used to deal with mixed 2629 * in-memory and on-disk records. 2630 * 2631 * NOTE: Can be called from the cluster code with an oversized buf. 2632 * 2633 * XXX atime update 2634 */ 2635 static 2636 int 2637 hammer_vop_strategy_read(struct vop_strategy_args *ap) 2638 { 2639 struct hammer_transaction trans; 2640 hammer_inode_t ip; 2641 hammer_inode_t dip; 2642 hammer_mount_t hmp; 2643 struct hammer_cursor cursor; 2644 hammer_base_elm_t base; 2645 hammer_off_t disk_offset; 2646 struct bio *bio; 2647 struct bio *nbio; 2648 struct buf *bp; 2649 int64_t rec_offset; 2650 int64_t ran_end; 2651 int64_t tmp64; 2652 int error; 2653 int boff; 2654 int roff; 2655 int n; 2656 int isdedupable; 2657 2658 bio = ap->a_bio; 2659 bp = bio->bio_buf; 2660 ip = ap->a_vp->v_data; 2661 hmp = ip->hmp; 2662 2663 /* 2664 * The zone-2 disk offset may have been set by the cluster code via 2665 * a BMAP operation, or else should be NOOFFSET. 2666 * 2667 * Checking the high bits for a match against zone-2 should suffice. 2668 * 2669 * In cases where a lot of data duplication is present it may be 2670 * more beneficial to drop through and doubule-buffer through the 2671 * device. 2672 */ 2673 nbio = push_bio(bio); 2674 if (hammer_is_zone_large_data(nbio->bio_offset)) { 2675 if (hammer_double_buffer == 0) { 2676 lwkt_gettoken(&hmp->fs_token); 2677 error = hammer_io_direct_read(hmp, nbio, NULL); 2678 lwkt_reltoken(&hmp->fs_token); 2679 return (error); 2680 } 2681 2682 /* 2683 * Try to shortcut requests for double_buffer mode too. 2684 * Since this mode runs through the device buffer cache 2685 * only compatible buffer sizes (meaning those generated 2686 * by normal filesystem buffers) are legal. 2687 */ 2688 if (hammer_live_dedup == 0 && (bp->b_flags & B_PAGING) == 0) { 2689 lwkt_gettoken(&hmp->fs_token); 2690 error = hammer_io_indirect_read(hmp, nbio, NULL); 2691 lwkt_reltoken(&hmp->fs_token); 2692 return (error); 2693 } 2694 } 2695 2696 /* 2697 * Well, that sucked. Do it the hard way. If all the stars are 2698 * aligned we may still be able to issue a direct-read. 2699 */ 2700 lwkt_gettoken(&hmp->fs_token); 2701 hammer_simple_transaction(&trans, hmp); 2702 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 2703 2704 /* 2705 * Key range (begin and end inclusive) to scan. Note that the key's 2706 * stored in the actual records represent BASE+LEN, not BASE. The 2707 * first record containing bio_offset will have a key > bio_offset. 2708 */ 2709 cursor.key_beg.localization = ip->obj_localization | 2710 HAMMER_LOCALIZE_MISC; 2711 cursor.key_beg.obj_id = ip->obj_id; 2712 cursor.key_beg.create_tid = 0; 2713 cursor.key_beg.delete_tid = 0; 2714 cursor.key_beg.obj_type = 0; 2715 cursor.key_beg.key = bio->bio_offset + 1; 2716 cursor.asof = ip->obj_asof; 2717 cursor.flags |= HAMMER_CURSOR_ASOF; 2718 2719 cursor.key_end = cursor.key_beg; 2720 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE); 2721 #if 0 2722 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) { 2723 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB; 2724 cursor.key_end.rec_type = HAMMER_RECTYPE_DB; 2725 cursor.key_end.key = HAMMER_MAX_KEY; 2726 } else 2727 #endif 2728 { 2729 ran_end = bio->bio_offset + bp->b_bufsize; 2730 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA; 2731 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA; 2732 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */ 2733 if (tmp64 < ran_end) 2734 cursor.key_end.key = HAMMER_MAX_KEY; 2735 else 2736 cursor.key_end.key = ran_end + MAXPHYS + 1; 2737 } 2738 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE; 2739 2740 /* 2741 * Set NOSWAPCACHE for cursor data extraction if double buffering 2742 * is disabled or (if the file is not marked cacheable via chflags 2743 * and vm.swapcache_use_chflags is enabled). 2744 */ 2745 if (hammer_double_buffer == 0 || 2746 ((ap->a_vp->v_flag & VSWAPCACHE) == 0 && 2747 vm_swapcache_use_chflags)) { 2748 cursor.flags |= HAMMER_CURSOR_NOSWAPCACHE; 2749 } 2750 2751 error = hammer_ip_first(&cursor); 2752 boff = 0; 2753 2754 while (error == 0) { 2755 /* 2756 * Get the base file offset of the record. The key for 2757 * data records is (base + bytes) rather then (base). 2758 */ 2759 base = &cursor.leaf->base; 2760 rec_offset = base->key - cursor.leaf->data_len; 2761 2762 /* 2763 * Calculate the gap, if any, and zero-fill it. 2764 * 2765 * n is the offset of the start of the record verses our 2766 * current seek offset in the bio. 2767 */ 2768 n = (int)(rec_offset - (bio->bio_offset + boff)); 2769 if (n > 0) { 2770 if (n > bp->b_bufsize - boff) 2771 n = bp->b_bufsize - boff; 2772 bzero((char *)bp->b_data + boff, n); 2773 boff += n; 2774 n = 0; 2775 } 2776 2777 /* 2778 * Calculate the data offset in the record and the number 2779 * of bytes we can copy. 2780 * 2781 * There are two degenerate cases. First, boff may already 2782 * be at bp->b_bufsize. Secondly, the data offset within 2783 * the record may exceed the record's size. 2784 */ 2785 roff = -n; 2786 rec_offset += roff; 2787 n = cursor.leaf->data_len - roff; 2788 if (n <= 0) { 2789 hdkprintf("bad n=%d roff=%d\n", n, roff); 2790 n = 0; 2791 } else if (n > bp->b_bufsize - boff) { 2792 n = bp->b_bufsize - boff; 2793 } 2794 2795 /* 2796 * Deal with cached truncations. This cool bit of code 2797 * allows truncate()/ftruncate() to avoid having to sync 2798 * the file. 2799 * 2800 * If the frontend is truncated then all backend records are 2801 * subject to the frontend's truncation. 2802 * 2803 * If the backend is truncated then backend records on-disk 2804 * (but not in-memory) are subject to the backend's 2805 * truncation. In-memory records owned by the backend 2806 * represent data written after the truncation point on the 2807 * backend and must not be truncated. 2808 * 2809 * Truncate operations deal with frontend buffer cache 2810 * buffers and frontend-owned in-memory records synchronously. 2811 */ 2812 if (ip->flags & HAMMER_INODE_TRUNCATED) { 2813 if (hammer_cursor_ondisk(&cursor)/* || 2814 cursor.iprec->flush_state == HAMMER_FST_FLUSH*/) { 2815 if (ip->trunc_off <= rec_offset) 2816 n = 0; 2817 else if (ip->trunc_off < rec_offset + n) 2818 n = (int)(ip->trunc_off - rec_offset); 2819 } 2820 } 2821 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 2822 if (hammer_cursor_ondisk(&cursor)) { 2823 if (ip->sync_trunc_off <= rec_offset) 2824 n = 0; 2825 else if (ip->sync_trunc_off < rec_offset + n) 2826 n = (int)(ip->sync_trunc_off - rec_offset); 2827 } 2828 } 2829 2830 /* 2831 * Try to issue a direct read into our bio if possible, 2832 * otherwise resolve the element data into a hammer_buffer 2833 * and copy. 2834 * 2835 * The buffer on-disk should be zerod past any real 2836 * truncation point, but may not be for any synthesized 2837 * truncation point from above. 2838 * 2839 * NOTE: disk_offset is only valid if the cursor data is 2840 * on-disk. 2841 */ 2842 disk_offset = cursor.leaf->data_offset + roff; 2843 isdedupable = (boff == 0 && n == bp->b_bufsize && 2844 hammer_cursor_ondisk(&cursor) && 2845 ((int)disk_offset & HAMMER_BUFMASK) == 0); 2846 2847 if (isdedupable && hammer_double_buffer == 0) { 2848 /* 2849 * Direct read case 2850 */ 2851 KKASSERT(hammer_is_zone_large_data(disk_offset)); 2852 nbio->bio_offset = disk_offset; 2853 error = hammer_io_direct_read(hmp, nbio, cursor.leaf); 2854 if (hammer_live_dedup && error == 0) 2855 hammer_dedup_cache_add(ip, cursor.leaf); 2856 goto done; 2857 } else if (isdedupable) { 2858 /* 2859 * Async I/O case for reading from backing store 2860 * and copying the data to the filesystem buffer. 2861 * live-dedup has to verify the data anyway if it 2862 * gets a hit later so we can just add the entry 2863 * now. 2864 */ 2865 KKASSERT(hammer_is_zone_large_data(disk_offset)); 2866 nbio->bio_offset = disk_offset; 2867 if (hammer_live_dedup) 2868 hammer_dedup_cache_add(ip, cursor.leaf); 2869 error = hammer_io_indirect_read(hmp, nbio, cursor.leaf); 2870 goto done; 2871 } else if (n) { 2872 error = hammer_ip_resolve_data(&cursor); 2873 if (error == 0) { 2874 if (hammer_live_dedup && isdedupable) 2875 hammer_dedup_cache_add(ip, cursor.leaf); 2876 bcopy((char *)cursor.data + roff, 2877 (char *)bp->b_data + boff, n); 2878 } 2879 } 2880 if (error) 2881 break; 2882 2883 /* 2884 * We have to be sure that the only elements added to the 2885 * dedup cache are those which are already on-media. 2886 */ 2887 if (hammer_live_dedup && hammer_cursor_ondisk(&cursor)) 2888 hammer_dedup_cache_add(ip, cursor.leaf); 2889 2890 /* 2891 * Iterate until we have filled the request. 2892 */ 2893 boff += n; 2894 if (boff == bp->b_bufsize) 2895 break; 2896 error = hammer_ip_next(&cursor); 2897 } 2898 2899 /* 2900 * There may have been a gap after the last record 2901 */ 2902 if (error == ENOENT) 2903 error = 0; 2904 if (error == 0 && boff != bp->b_bufsize) { 2905 KKASSERT(boff < bp->b_bufsize); 2906 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff); 2907 /* boff = bp->b_bufsize; */ 2908 } 2909 2910 /* 2911 * Disallow swapcache operation on the vnode buffer if double 2912 * buffering is enabled, the swapcache will get the data via 2913 * the block device buffer. 2914 */ 2915 if (hammer_double_buffer) 2916 bp->b_flags |= B_NOTMETA; 2917 2918 /* 2919 * Cleanup 2920 */ 2921 bp->b_resid = 0; 2922 bp->b_error = error; 2923 if (error) 2924 bp->b_flags |= B_ERROR; 2925 biodone(ap->a_bio); 2926 2927 done: 2928 /* 2929 * Cache the b-tree node for the last data read in cache[1]. 2930 * 2931 * If we hit the file EOF then also cache the node in the 2932 * governing directory's cache[3], it will be used to initialize 2933 * the new inode's cache[1] for any inodes looked up via the directory. 2934 * 2935 * This doesn't reduce disk accesses since the B-Tree chain is 2936 * likely cached, but it does reduce cpu overhead when looking 2937 * up file offsets for cpdup/tar/cpio style iterations. 2938 */ 2939 if (cursor.node) 2940 hammer_cache_node(&ip->cache[1], cursor.node); 2941 if (ran_end >= ip->ino_data.size) { 2942 dip = hammer_find_inode(&trans, ip->ino_data.parent_obj_id, 2943 ip->obj_asof, ip->obj_localization); 2944 if (dip) { 2945 hammer_cache_node(&dip->cache[3], cursor.node); 2946 hammer_rel_inode(dip, 0); 2947 } 2948 } 2949 hammer_done_cursor(&cursor); 2950 hammer_done_transaction(&trans); 2951 lwkt_reltoken(&hmp->fs_token); 2952 return(error); 2953 } 2954 2955 /* 2956 * BMAP operation - used to support cluster_read() only. 2957 * 2958 * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb) 2959 * 2960 * This routine may return EOPNOTSUPP if the opration is not supported for 2961 * the specified offset. The contents of the pointer arguments do not 2962 * need to be initialized in that case. 2963 * 2964 * If a disk address is available and properly aligned return 0 with 2965 * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately 2966 * to the run-length relative to that offset. Callers may assume that 2967 * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently 2968 * large, so return EOPNOTSUPP if it is not sufficiently large. 2969 */ 2970 static 2971 int 2972 hammer_vop_bmap(struct vop_bmap_args *ap) 2973 { 2974 struct hammer_transaction trans; 2975 hammer_inode_t ip; 2976 hammer_mount_t hmp; 2977 struct hammer_cursor cursor; 2978 hammer_base_elm_t base; 2979 int64_t rec_offset; 2980 int64_t ran_end; 2981 int64_t tmp64; 2982 int64_t base_offset; 2983 int64_t base_disk_offset; 2984 int64_t last_offset; 2985 hammer_off_t last_disk_offset; 2986 hammer_off_t disk_offset; 2987 int rec_len; 2988 int error; 2989 int blksize; 2990 2991 ++hammer_stats_file_iopsr; 2992 ip = ap->a_vp->v_data; 2993 hmp = ip->hmp; 2994 2995 /* 2996 * We can only BMAP regular files. We can't BMAP database files, 2997 * directories, etc. 2998 */ 2999 if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE) 3000 return(EOPNOTSUPP); 3001 3002 /* 3003 * bmap is typically called with runp/runb both NULL when used 3004 * for writing. We do not support BMAP for writing atm. 3005 */ 3006 if (ap->a_cmd != BUF_CMD_READ) 3007 return(EOPNOTSUPP); 3008 3009 /* 3010 * Scan the B-Tree to acquire blockmap addresses, then translate 3011 * to raw addresses. 3012 */ 3013 lwkt_gettoken(&hmp->fs_token); 3014 hammer_simple_transaction(&trans, hmp); 3015 3016 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 3017 3018 /* 3019 * Key range (begin and end inclusive) to scan. Note that the key's 3020 * stored in the actual records represent BASE+LEN, not BASE. The 3021 * first record containing bio_offset will have a key > bio_offset. 3022 */ 3023 cursor.key_beg.localization = ip->obj_localization | 3024 HAMMER_LOCALIZE_MISC; 3025 cursor.key_beg.obj_id = ip->obj_id; 3026 cursor.key_beg.create_tid = 0; 3027 cursor.key_beg.delete_tid = 0; 3028 cursor.key_beg.obj_type = 0; 3029 if (ap->a_runb) 3030 cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1; 3031 else 3032 cursor.key_beg.key = ap->a_loffset + 1; 3033 if (cursor.key_beg.key < 0) 3034 cursor.key_beg.key = 0; 3035 cursor.asof = ip->obj_asof; 3036 cursor.flags |= HAMMER_CURSOR_ASOF; 3037 3038 cursor.key_end = cursor.key_beg; 3039 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE); 3040 3041 ran_end = ap->a_loffset + MAXPHYS; 3042 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA; 3043 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA; 3044 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */ 3045 if (tmp64 < ran_end) 3046 cursor.key_end.key = HAMMER_MAX_KEY; 3047 else 3048 cursor.key_end.key = ran_end + MAXPHYS + 1; 3049 3050 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE; 3051 3052 error = hammer_ip_first(&cursor); 3053 base_offset = last_offset = 0; 3054 base_disk_offset = last_disk_offset = 0; 3055 3056 while (error == 0) { 3057 /* 3058 * Get the base file offset of the record. The key for 3059 * data records is (base + bytes) rather then (base). 3060 * 3061 * NOTE: rec_offset + rec_len may exceed the end-of-file. 3062 * The extra bytes should be zero on-disk and the BMAP op 3063 * should still be ok. 3064 */ 3065 base = &cursor.leaf->base; 3066 rec_offset = base->key - cursor.leaf->data_len; 3067 rec_len = cursor.leaf->data_len; 3068 3069 /* 3070 * Incorporate any cached truncation. 3071 * 3072 * NOTE: Modifications to rec_len based on synthesized 3073 * truncation points remove the guarantee that any extended 3074 * data on disk is zero (since the truncations may not have 3075 * taken place on-media yet). 3076 */ 3077 if (ip->flags & HAMMER_INODE_TRUNCATED) { 3078 if (hammer_cursor_ondisk(&cursor) || 3079 cursor.iprec->flush_state == HAMMER_FST_FLUSH) { 3080 if (ip->trunc_off <= rec_offset) 3081 rec_len = 0; 3082 else if (ip->trunc_off < rec_offset + rec_len) 3083 rec_len = (int)(ip->trunc_off - rec_offset); 3084 } 3085 } 3086 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 3087 if (hammer_cursor_ondisk(&cursor)) { 3088 if (ip->sync_trunc_off <= rec_offset) 3089 rec_len = 0; 3090 else if (ip->sync_trunc_off < rec_offset + rec_len) 3091 rec_len = (int)(ip->sync_trunc_off - rec_offset); 3092 } 3093 } 3094 3095 /* 3096 * Accumulate information. If we have hit a discontiguous 3097 * block reset base_offset unless we are already beyond the 3098 * requested offset. If we are, that's it, we stop. 3099 */ 3100 if (error) 3101 break; 3102 if (hammer_cursor_ondisk(&cursor)) { 3103 disk_offset = cursor.leaf->data_offset; 3104 if (rec_offset != last_offset || 3105 disk_offset != last_disk_offset) { 3106 if (rec_offset > ap->a_loffset) 3107 break; 3108 base_offset = rec_offset; 3109 base_disk_offset = disk_offset; 3110 } 3111 last_offset = rec_offset + rec_len; 3112 last_disk_offset = disk_offset + rec_len; 3113 3114 if (hammer_live_dedup) 3115 hammer_dedup_cache_add(ip, cursor.leaf); 3116 } 3117 3118 error = hammer_ip_next(&cursor); 3119 } 3120 3121 if (cursor.node) 3122 hammer_cache_node(&ip->cache[1], cursor.node); 3123 3124 hammer_done_cursor(&cursor); 3125 hammer_done_transaction(&trans); 3126 lwkt_reltoken(&hmp->fs_token); 3127 3128 /* 3129 * If we couldn't find any records or the records we did find were 3130 * all behind the requested offset, return failure. A forward 3131 * truncation can leave a hole w/ no on-disk records. 3132 */ 3133 if (last_offset == 0 || last_offset < ap->a_loffset) 3134 return (EOPNOTSUPP); 3135 3136 /* 3137 * Figure out the block size at the requested offset and adjust 3138 * our limits so the cluster_read() does not create inappropriately 3139 * sized buffer cache buffers. 3140 */ 3141 blksize = hammer_blocksize(ap->a_loffset); 3142 if (hammer_blocksize(base_offset) != blksize) { 3143 base_offset = hammer_blockdemarc(base_offset, ap->a_loffset); 3144 } 3145 if (last_offset != ap->a_loffset && 3146 hammer_blocksize(last_offset - 1) != blksize) { 3147 last_offset = hammer_blockdemarc(ap->a_loffset, 3148 last_offset - 1); 3149 } 3150 3151 /* 3152 * Returning EOPNOTSUPP simply prevents the direct-IO optimization 3153 * from occuring. 3154 */ 3155 disk_offset = base_disk_offset + (ap->a_loffset - base_offset); 3156 3157 if (!hammer_is_zone_large_data(disk_offset)) { 3158 /* 3159 * Only large-data zones can be direct-IOd 3160 */ 3161 error = EOPNOTSUPP; 3162 } else if ((disk_offset & HAMMER_BUFMASK) || 3163 (last_offset - ap->a_loffset) < blksize) { 3164 /* 3165 * doffsetp is not aligned or the forward run size does 3166 * not cover a whole buffer, disallow the direct I/O. 3167 */ 3168 error = EOPNOTSUPP; 3169 } else { 3170 /* 3171 * We're good. 3172 */ 3173 *ap->a_doffsetp = disk_offset; 3174 if (ap->a_runb) { 3175 *ap->a_runb = ap->a_loffset - base_offset; 3176 KKASSERT(*ap->a_runb >= 0); 3177 } 3178 if (ap->a_runp) { 3179 *ap->a_runp = last_offset - ap->a_loffset; 3180 KKASSERT(*ap->a_runp >= 0); 3181 } 3182 error = 0; 3183 } 3184 return(error); 3185 } 3186 3187 /* 3188 * Write to a regular file. Because this is a strategy call the OS is 3189 * trying to actually get data onto the media. 3190 */ 3191 static 3192 int 3193 hammer_vop_strategy_write(struct vop_strategy_args *ap) 3194 { 3195 hammer_record_t record; 3196 hammer_mount_t hmp; 3197 hammer_inode_t ip; 3198 struct bio *bio; 3199 struct buf *bp; 3200 int blksize __debugvar; 3201 int bytes; 3202 int error; 3203 3204 bio = ap->a_bio; 3205 bp = bio->bio_buf; 3206 ip = ap->a_vp->v_data; 3207 hmp = ip->hmp; 3208 3209 blksize = hammer_blocksize(bio->bio_offset); 3210 KKASSERT(bp->b_bufsize == blksize); 3211 3212 if (ip->flags & HAMMER_INODE_RO) { 3213 bp->b_error = EROFS; 3214 bp->b_flags |= B_ERROR; 3215 biodone(ap->a_bio); 3216 return(EROFS); 3217 } 3218 3219 lwkt_gettoken(&hmp->fs_token); 3220 3221 /* 3222 * Disallow swapcache operation on the vnode buffer if double 3223 * buffering is enabled, the swapcache will get the data via 3224 * the block device buffer. 3225 */ 3226 if (hammer_double_buffer) 3227 bp->b_flags |= B_NOTMETA; 3228 3229 /* 3230 * Interlock with inode destruction (no in-kernel or directory 3231 * topology visibility). If we queue new IO while trying to 3232 * destroy the inode we can deadlock the vtrunc call in 3233 * hammer_inode_unloadable_check(). 3234 * 3235 * Besides, there's no point flushing a bp associated with an 3236 * inode that is being destroyed on-media and has no kernel 3237 * references. 3238 */ 3239 if ((ip->flags | ip->sync_flags) & 3240 (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) { 3241 bp->b_resid = 0; 3242 biodone(ap->a_bio); 3243 lwkt_reltoken(&hmp->fs_token); 3244 return(0); 3245 } 3246 3247 /* 3248 * Reserve space and issue a direct-write from the front-end. 3249 * NOTE: The direct_io code will hammer_bread/bcopy smaller 3250 * allocations. 3251 * 3252 * An in-memory record will be installed to reference the storage 3253 * until the flusher can get to it. 3254 * 3255 * Since we own the high level bio the front-end will not try to 3256 * do a direct-read until the write completes. 3257 * 3258 * NOTE: The only time we do not reserve a full-sized buffers 3259 * worth of data is if the file is small. We do not try to 3260 * allocate a fragment (from the small-data zone) at the end of 3261 * an otherwise large file as this can lead to wildly separated 3262 * data. 3263 */ 3264 KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0); 3265 KKASSERT(bio->bio_offset < ip->ino_data.size); 3266 if (bio->bio_offset || ip->ino_data.size > HAMMER_HBUFSIZE) 3267 bytes = bp->b_bufsize; 3268 else 3269 bytes = HAMMER_DATA_DOALIGN_WITH(int, ip->ino_data.size); 3270 3271 record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data, 3272 bytes, &error); 3273 3274 /* 3275 * B_VFSFLAG1 indicates that a REDO_WRITE entry was generated 3276 * in hammer_vop_write(). We must flag the record so the proper 3277 * REDO_TERM_WRITE entry is generated during the flush. 3278 */ 3279 if (record) { 3280 if (bp->b_flags & B_VFSFLAG1) { 3281 record->flags |= HAMMER_RECF_REDO; 3282 bp->b_flags &= ~B_VFSFLAG1; 3283 } 3284 if (record->flags & HAMMER_RECF_DEDUPED) { 3285 bp->b_resid = 0; 3286 hammer_ip_replace_bulk(hmp, record); 3287 biodone(ap->a_bio); 3288 } else { 3289 hammer_io_direct_write(hmp, bio, record); 3290 } 3291 if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs) 3292 hammer_flush_inode(ip, 0); 3293 } else { 3294 bp->b_bio2.bio_offset = NOOFFSET; 3295 bp->b_error = error; 3296 bp->b_flags |= B_ERROR; 3297 biodone(ap->a_bio); 3298 } 3299 lwkt_reltoken(&hmp->fs_token); 3300 return(error); 3301 } 3302 3303 /* 3304 * dounlink - disconnect a directory entry 3305 * 3306 * XXX whiteout support not really in yet 3307 */ 3308 static int 3309 hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch, 3310 struct vnode *dvp, struct ucred *cred, 3311 int flags, int isdir) 3312 { 3313 struct namecache *ncp; 3314 hammer_inode_t dip; 3315 hammer_inode_t ip; 3316 hammer_mount_t hmp; 3317 struct hammer_cursor cursor; 3318 int64_t namekey; 3319 uint32_t max_iterations; 3320 int nlen, error; 3321 3322 /* 3323 * Calculate the namekey and setup the key range for the scan. This 3324 * works kinda like a chained hash table where the lower 32 bits 3325 * of the namekey synthesize the chain. 3326 * 3327 * The key range is inclusive of both key_beg and key_end. 3328 */ 3329 dip = VTOI(dvp); 3330 ncp = nch->ncp; 3331 hmp = dip->hmp; 3332 3333 if (dip->flags & HAMMER_INODE_RO) 3334 return (EROFS); 3335 3336 namekey = hammer_direntry_namekey(dip, ncp->nc_name, ncp->nc_nlen, 3337 &max_iterations); 3338 retry: 3339 hammer_init_cursor(trans, &cursor, &dip->cache[1], dip); 3340 cursor.key_beg.localization = dip->obj_localization | 3341 hammer_dir_localization(dip); 3342 cursor.key_beg.obj_id = dip->obj_id; 3343 cursor.key_beg.key = namekey; 3344 cursor.key_beg.create_tid = 0; 3345 cursor.key_beg.delete_tid = 0; 3346 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 3347 cursor.key_beg.obj_type = 0; 3348 3349 cursor.key_end = cursor.key_beg; 3350 cursor.key_end.key += max_iterations; 3351 cursor.asof = dip->obj_asof; 3352 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 3353 3354 /* 3355 * Scan all matching records (the chain), locate the one matching 3356 * the requested path component. info->last_error contains the 3357 * error code on search termination and could be 0, ENOENT, or 3358 * something else. 3359 * 3360 * The hammer_ip_*() functions merge in-memory records with on-disk 3361 * records for the purposes of the search. 3362 */ 3363 error = hammer_ip_first(&cursor); 3364 3365 while (error == 0) { 3366 error = hammer_ip_resolve_data(&cursor); 3367 if (error) 3368 break; 3369 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF; 3370 KKASSERT(nlen > 0); 3371 if (ncp->nc_nlen == nlen && 3372 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) { 3373 break; 3374 } 3375 error = hammer_ip_next(&cursor); 3376 } 3377 3378 /* 3379 * If all is ok we have to get the inode so we can adjust nlinks. 3380 * To avoid a deadlock with the flusher we must release the inode 3381 * lock on the directory when acquiring the inode for the entry. 3382 * 3383 * If the target is a directory, it must be empty. 3384 */ 3385 if (error == 0) { 3386 hammer_unlock(&cursor.ip->lock); 3387 ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id, 3388 hmp->asof, 3389 cursor.data->entry.localization, 3390 0, &error); 3391 hammer_lock_sh(&cursor.ip->lock); 3392 if (error == ENOENT) { 3393 hkprintf("WARNING: Removing dirent w/missing inode " 3394 "\"%s\"\n" 3395 "\tobj_id = %016jx\n", 3396 ncp->nc_name, 3397 (intmax_t)cursor.data->entry.obj_id); 3398 error = 0; 3399 } 3400 3401 /* 3402 * If isdir >= 0 we validate that the entry is or is not a 3403 * directory. If isdir < 0 we don't care. 3404 */ 3405 if (error == 0 && isdir >= 0 && ip) { 3406 if (isdir && 3407 ip->ino_data.obj_type != HAMMER_OBJTYPE_DIRECTORY) { 3408 error = ENOTDIR; 3409 } else if (isdir == 0 && 3410 ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY) { 3411 error = EISDIR; 3412 } 3413 } 3414 3415 /* 3416 * If we are trying to remove a directory the directory must 3417 * be empty. 3418 * 3419 * The check directory code can loop and deadlock/retry. Our 3420 * own cursor's node locks must be released to avoid a 3-way 3421 * deadlock with the flusher if the check directory code 3422 * blocks. 3423 * 3424 * If any changes whatsoever have been made to the cursor 3425 * set EDEADLK and retry. 3426 * 3427 * WARNING: See warnings in hammer_unlock_cursor() 3428 * function. 3429 */ 3430 if (error == 0 && ip && ip->ino_data.obj_type == 3431 HAMMER_OBJTYPE_DIRECTORY) { 3432 hammer_unlock_cursor(&cursor); 3433 error = hammer_ip_check_directory_empty(trans, ip); 3434 hammer_lock_cursor(&cursor); 3435 if (cursor.flags & HAMMER_CURSOR_RETEST) { 3436 hkprintf("Warning: avoided deadlock " 3437 "on rmdir '%s'\n", 3438 ncp->nc_name); 3439 error = EDEADLK; 3440 } 3441 } 3442 3443 /* 3444 * Delete the directory entry. 3445 * 3446 * WARNING: hammer_ip_del_direntry() may have to terminate 3447 * the cursor to avoid a deadlock. It is ok to call 3448 * hammer_done_cursor() twice. 3449 */ 3450 if (error == 0) { 3451 error = hammer_ip_del_direntry(trans, &cursor, 3452 dip, ip); 3453 } 3454 hammer_done_cursor(&cursor); 3455 if (error == 0) { 3456 /* 3457 * Tell the namecache that we are now unlinked. 3458 */ 3459 cache_unlink(nch); 3460 3461 /* 3462 * NOTE: ip->vp, if non-NULL, cannot be directly 3463 * referenced without formally acquiring the 3464 * vp since the vp might have zero refs on it, 3465 * or in the middle of a reclaim, etc. 3466 * 3467 * NOTE: The cache_setunresolved() can rip the vp 3468 * out from under us since the vp may not have 3469 * any refs, in which case ip->vp will be NULL 3470 * from the outset. 3471 */ 3472 while (ip && ip->vp) { 3473 struct vnode *vp; 3474 3475 error = hammer_get_vnode(ip, &vp); 3476 if (error == 0 && vp) { 3477 vn_unlock(vp); 3478 hammer_knote(ip->vp, NOTE_DELETE); 3479 #if 0 3480 /* 3481 * Don't do this, it can deadlock 3482 * on concurrent rm's of hardlinks. 3483 * Shouldn't be needed any more. 3484 */ 3485 cache_inval_vp(ip->vp, CINV_DESTROY); 3486 #endif 3487 vrele(vp); 3488 break; 3489 } 3490 hdkprintf("ip/vp race1 avoided\n"); 3491 } 3492 } 3493 if (ip) 3494 hammer_rel_inode(ip, 0); 3495 } else { 3496 hammer_done_cursor(&cursor); 3497 } 3498 if (error == EDEADLK) 3499 goto retry; 3500 3501 return (error); 3502 } 3503 3504 /************************************************************************ 3505 * FIFO AND SPECFS OPS * 3506 ************************************************************************ 3507 * 3508 */ 3509 static int 3510 hammer_vop_fifoclose (struct vop_close_args *ap) 3511 { 3512 /* XXX update itimes */ 3513 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3514 } 3515 3516 static int 3517 hammer_vop_fiforead (struct vop_read_args *ap) 3518 { 3519 int error; 3520 3521 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 3522 /* XXX update access time */ 3523 return (error); 3524 } 3525 3526 static int 3527 hammer_vop_fifowrite (struct vop_write_args *ap) 3528 { 3529 int error; 3530 3531 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 3532 /* XXX update access time */ 3533 return (error); 3534 } 3535 3536 static 3537 int 3538 hammer_vop_fifokqfilter(struct vop_kqfilter_args *ap) 3539 { 3540 int error; 3541 3542 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 3543 if (error) 3544 error = hammer_vop_kqfilter(ap); 3545 return(error); 3546 } 3547 3548 /************************************************************************ 3549 * KQFILTER OPS * 3550 ************************************************************************ 3551 * 3552 */ 3553 static void filt_hammerdetach(struct knote *kn); 3554 static int filt_hammerread(struct knote *kn, long hint); 3555 static int filt_hammerwrite(struct knote *kn, long hint); 3556 static int filt_hammervnode(struct knote *kn, long hint); 3557 3558 static struct filterops hammerread_filtops = 3559 { FILTEROP_ISFD | FILTEROP_MPSAFE, 3560 NULL, filt_hammerdetach, filt_hammerread }; 3561 static struct filterops hammerwrite_filtops = 3562 { FILTEROP_ISFD | FILTEROP_MPSAFE, 3563 NULL, filt_hammerdetach, filt_hammerwrite }; 3564 static struct filterops hammervnode_filtops = 3565 { FILTEROP_ISFD | FILTEROP_MPSAFE, 3566 NULL, filt_hammerdetach, filt_hammervnode }; 3567 3568 static 3569 int 3570 hammer_vop_kqfilter(struct vop_kqfilter_args *ap) 3571 { 3572 struct vnode *vp = ap->a_vp; 3573 struct knote *kn = ap->a_kn; 3574 3575 switch (kn->kn_filter) { 3576 case EVFILT_READ: 3577 kn->kn_fop = &hammerread_filtops; 3578 break; 3579 case EVFILT_WRITE: 3580 kn->kn_fop = &hammerwrite_filtops; 3581 break; 3582 case EVFILT_VNODE: 3583 kn->kn_fop = &hammervnode_filtops; 3584 break; 3585 default: 3586 return (EOPNOTSUPP); 3587 } 3588 3589 kn->kn_hook = (caddr_t)vp; 3590 3591 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 3592 3593 return(0); 3594 } 3595 3596 static void 3597 filt_hammerdetach(struct knote *kn) 3598 { 3599 struct vnode *vp = (void *)kn->kn_hook; 3600 3601 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 3602 } 3603 3604 static int 3605 filt_hammerread(struct knote *kn, long hint) 3606 { 3607 struct vnode *vp = (void *)kn->kn_hook; 3608 hammer_inode_t ip = VTOI(vp); 3609 hammer_mount_t hmp = ip->hmp; 3610 off_t off; 3611 3612 if (hint == NOTE_REVOKE) { 3613 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 3614 return(1); 3615 } 3616 lwkt_gettoken(&hmp->fs_token); /* XXX use per-ip-token */ 3617 off = ip->ino_data.size - kn->kn_fp->f_offset; 3618 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 3619 lwkt_reltoken(&hmp->fs_token); 3620 if (kn->kn_sfflags & NOTE_OLDAPI) 3621 return(1); 3622 return (kn->kn_data != 0); 3623 } 3624 3625 static int 3626 filt_hammerwrite(struct knote *kn, long hint) 3627 { 3628 if (hint == NOTE_REVOKE) 3629 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 3630 kn->kn_data = 0; 3631 return (1); 3632 } 3633 3634 static int 3635 filt_hammervnode(struct knote *kn, long hint) 3636 { 3637 if (kn->kn_sfflags & hint) 3638 kn->kn_fflags |= hint; 3639 if (hint == NOTE_REVOKE) { 3640 kn->kn_flags |= (EV_EOF | EV_NODATA); 3641 return (1); 3642 } 3643 return (kn->kn_fflags != 0); 3644 } 3645 3646