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 * $DragonFly: src/sys/vfs/hammer/hammer_vnops.c,v 1.102 2008/10/16 17:24:16 dillon Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/fcntl.h> 41 #include <sys/namecache.h> 42 #include <sys/vnode.h> 43 #include <sys/lockf.h> 44 #include <sys/event.h> 45 #include <sys/stat.h> 46 #include <sys/dirent.h> 47 #include <sys/file.h> 48 #include <vm/vm_extern.h> 49 #include <vm/swap_pager.h> 50 #include <vfs/fifofs/fifo.h> 51 52 #include "hammer.h" 53 54 /* 55 * USERFS VNOPS 56 */ 57 /*static int hammer_vop_vnoperate(struct vop_generic_args *);*/ 58 static int hammer_vop_fsync(struct vop_fsync_args *); 59 static int hammer_vop_read(struct vop_read_args *); 60 static int hammer_vop_write(struct vop_write_args *); 61 static int hammer_vop_access(struct vop_access_args *); 62 static int hammer_vop_advlock(struct vop_advlock_args *); 63 static int hammer_vop_close(struct vop_close_args *); 64 static int hammer_vop_ncreate(struct vop_ncreate_args *); 65 static int hammer_vop_getattr(struct vop_getattr_args *); 66 static int hammer_vop_nresolve(struct vop_nresolve_args *); 67 static int hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *); 68 static int hammer_vop_nlink(struct vop_nlink_args *); 69 static int hammer_vop_nmkdir(struct vop_nmkdir_args *); 70 static int hammer_vop_nmknod(struct vop_nmknod_args *); 71 static int hammer_vop_open(struct vop_open_args *); 72 static int hammer_vop_print(struct vop_print_args *); 73 static int hammer_vop_readdir(struct vop_readdir_args *); 74 static int hammer_vop_readlink(struct vop_readlink_args *); 75 static int hammer_vop_nremove(struct vop_nremove_args *); 76 static int hammer_vop_nrename(struct vop_nrename_args *); 77 static int hammer_vop_nrmdir(struct vop_nrmdir_args *); 78 static int hammer_vop_markatime(struct vop_markatime_args *); 79 static int hammer_vop_setattr(struct vop_setattr_args *); 80 static int hammer_vop_strategy(struct vop_strategy_args *); 81 static int hammer_vop_bmap(struct vop_bmap_args *ap); 82 static int hammer_vop_nsymlink(struct vop_nsymlink_args *); 83 static int hammer_vop_nwhiteout(struct vop_nwhiteout_args *); 84 static int hammer_vop_ioctl(struct vop_ioctl_args *); 85 static int hammer_vop_mountctl(struct vop_mountctl_args *); 86 static int hammer_vop_kqfilter (struct vop_kqfilter_args *); 87 88 static int hammer_vop_fifoclose (struct vop_close_args *); 89 static int hammer_vop_fiforead (struct vop_read_args *); 90 static int hammer_vop_fifowrite (struct vop_write_args *); 91 static int hammer_vop_fifokqfilter (struct vop_kqfilter_args *); 92 93 struct vop_ops hammer_vnode_vops = { 94 .vop_default = vop_defaultop, 95 .vop_fsync = hammer_vop_fsync, 96 .vop_getpages = vop_stdgetpages, 97 .vop_putpages = vop_stdputpages, 98 .vop_read = hammer_vop_read, 99 .vop_write = hammer_vop_write, 100 .vop_access = hammer_vop_access, 101 .vop_advlock = hammer_vop_advlock, 102 .vop_close = hammer_vop_close, 103 .vop_ncreate = hammer_vop_ncreate, 104 .vop_getattr = hammer_vop_getattr, 105 .vop_inactive = hammer_vop_inactive, 106 .vop_reclaim = hammer_vop_reclaim, 107 .vop_nresolve = hammer_vop_nresolve, 108 .vop_nlookupdotdot = hammer_vop_nlookupdotdot, 109 .vop_nlink = hammer_vop_nlink, 110 .vop_nmkdir = hammer_vop_nmkdir, 111 .vop_nmknod = hammer_vop_nmknod, 112 .vop_open = hammer_vop_open, 113 .vop_pathconf = vop_stdpathconf, 114 .vop_print = hammer_vop_print, 115 .vop_readdir = hammer_vop_readdir, 116 .vop_readlink = hammer_vop_readlink, 117 .vop_nremove = hammer_vop_nremove, 118 .vop_nrename = hammer_vop_nrename, 119 .vop_nrmdir = hammer_vop_nrmdir, 120 .vop_markatime = hammer_vop_markatime, 121 .vop_setattr = hammer_vop_setattr, 122 .vop_bmap = hammer_vop_bmap, 123 .vop_strategy = hammer_vop_strategy, 124 .vop_nsymlink = hammer_vop_nsymlink, 125 .vop_nwhiteout = hammer_vop_nwhiteout, 126 .vop_ioctl = hammer_vop_ioctl, 127 .vop_mountctl = hammer_vop_mountctl, 128 .vop_kqfilter = hammer_vop_kqfilter 129 }; 130 131 struct vop_ops hammer_spec_vops = { 132 .vop_default = vop_defaultop, 133 .vop_fsync = hammer_vop_fsync, 134 .vop_read = vop_stdnoread, 135 .vop_write = vop_stdnowrite, 136 .vop_access = hammer_vop_access, 137 .vop_close = hammer_vop_close, 138 .vop_markatime = hammer_vop_markatime, 139 .vop_getattr = hammer_vop_getattr, 140 .vop_inactive = hammer_vop_inactive, 141 .vop_reclaim = hammer_vop_reclaim, 142 .vop_setattr = hammer_vop_setattr 143 }; 144 145 struct vop_ops hammer_fifo_vops = { 146 .vop_default = fifo_vnoperate, 147 .vop_fsync = hammer_vop_fsync, 148 .vop_read = hammer_vop_fiforead, 149 .vop_write = hammer_vop_fifowrite, 150 .vop_access = hammer_vop_access, 151 .vop_close = hammer_vop_fifoclose, 152 .vop_markatime = hammer_vop_markatime, 153 .vop_getattr = hammer_vop_getattr, 154 .vop_inactive = hammer_vop_inactive, 155 .vop_reclaim = hammer_vop_reclaim, 156 .vop_setattr = hammer_vop_setattr, 157 .vop_kqfilter = hammer_vop_fifokqfilter 158 }; 159 160 static __inline 161 void 162 hammer_knote(struct vnode *vp, int flags) 163 { 164 if (flags) 165 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags); 166 } 167 168 #ifdef DEBUG_TRUNCATE 169 struct hammer_inode *HammerTruncIp; 170 #endif 171 172 static int hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch, 173 struct vnode *dvp, struct ucred *cred, 174 int flags, int isdir); 175 static int hammer_vop_strategy_read(struct vop_strategy_args *ap); 176 static int hammer_vop_strategy_write(struct vop_strategy_args *ap); 177 178 #if 0 179 static 180 int 181 hammer_vop_vnoperate(struct vop_generic_args *) 182 { 183 return (VOCALL(&hammer_vnode_vops, ap)); 184 } 185 #endif 186 187 /* 188 * hammer_vop_fsync { vp, waitfor } 189 * 190 * fsync() an inode to disk and wait for it to be completely committed 191 * such that the information would not be undone if a crash occured after 192 * return. 193 * 194 * NOTE: HAMMER's fsync()'s are going to remain expensive until we implement 195 * a REDO log. A sysctl is provided to relax HAMMER's fsync() 196 * operation. 197 * 198 * Ultimately the combination of a REDO log and use of fast storage 199 * to front-end cluster caches will make fsync fast, but it aint 200 * here yet. And, in anycase, we need real transactional 201 * all-or-nothing features which are not restricted to a single file. 202 */ 203 static 204 int 205 hammer_vop_fsync(struct vop_fsync_args *ap) 206 { 207 hammer_inode_t ip = VTOI(ap->a_vp); 208 hammer_mount_t hmp = ip->hmp; 209 int waitfor = ap->a_waitfor; 210 int mode; 211 212 lwkt_gettoken(&hmp->fs_token); 213 214 /* 215 * Fsync rule relaxation (default is either full synchronous flush 216 * or REDO semantics with synchronous flush). 217 */ 218 if (ap->a_flags & VOP_FSYNC_SYSCALL) { 219 switch(hammer_fsync_mode) { 220 case 0: 221 mode0: 222 /* no REDO, full synchronous flush */ 223 goto skip; 224 case 1: 225 mode1: 226 /* no REDO, full asynchronous flush */ 227 if (waitfor == MNT_WAIT) 228 waitfor = MNT_NOWAIT; 229 goto skip; 230 case 2: 231 /* REDO semantics, synchronous flush */ 232 if (hmp->version < HAMMER_VOL_VERSION_FOUR) 233 goto mode0; 234 mode = HAMMER_FLUSH_UNDOS_AUTO; 235 break; 236 case 3: 237 /* REDO semantics, relaxed asynchronous flush */ 238 if (hmp->version < HAMMER_VOL_VERSION_FOUR) 239 goto mode1; 240 mode = HAMMER_FLUSH_UNDOS_RELAXED; 241 if (waitfor == MNT_WAIT) 242 waitfor = MNT_NOWAIT; 243 break; 244 case 4: 245 /* ignore the fsync() system call */ 246 lwkt_reltoken(&hmp->fs_token); 247 return(0); 248 default: 249 /* we have to do something */ 250 mode = HAMMER_FLUSH_UNDOS_RELAXED; 251 if (waitfor == MNT_WAIT) 252 waitfor = MNT_NOWAIT; 253 break; 254 } 255 256 /* 257 * Fast fsync only needs to flush the UNDO/REDO fifo if 258 * HAMMER_INODE_REDO is non-zero and the only modifications 259 * made to the file are write or write-extends. 260 */ 261 if ((ip->flags & HAMMER_INODE_REDO) && 262 (ip->flags & HAMMER_INODE_MODMASK_NOREDO) == 0 263 ) { 264 ++hammer_count_fsyncs; 265 hammer_flusher_flush_undos(hmp, mode); 266 ip->redo_count = 0; 267 lwkt_reltoken(&hmp->fs_token); 268 return(0); 269 } 270 271 /* 272 * REDO is enabled by fsync(), the idea being we really only 273 * want to lay down REDO records when programs are using 274 * fsync() heavily. The first fsync() on the file starts 275 * the gravy train going and later fsync()s keep it hot by 276 * resetting the redo_count. 277 * 278 * We weren't running REDOs before now so we have to fall 279 * through and do a full fsync of what we have. 280 */ 281 if (hmp->version >= HAMMER_VOL_VERSION_FOUR && 282 (hmp->flags & HAMMER_MOUNT_REDO_RECOVERY_RUN) == 0) { 283 ip->flags |= HAMMER_INODE_REDO; 284 ip->redo_count = 0; 285 } 286 } 287 skip: 288 289 /* 290 * Do a full flush sequence. 291 * 292 * Attempt to release the vnode while waiting for the inode to 293 * finish flushing. This can really mess up inactive->reclaim 294 * sequences so only do it if the vnode is active. 295 */ 296 ++hammer_count_fsyncs; 297 vfsync(ap->a_vp, waitfor, 1, NULL, NULL); 298 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 299 if (waitfor == MNT_WAIT) { 300 if ((ap->a_vp->v_flag & VINACTIVE) == 0) 301 vn_unlock(ap->a_vp); 302 hammer_wait_inode(ip); 303 if ((ap->a_vp->v_flag & VINACTIVE) == 0) 304 vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY); 305 } 306 lwkt_reltoken(&hmp->fs_token); 307 return (ip->error); 308 } 309 310 /* 311 * hammer_vop_read { vp, uio, ioflag, cred } 312 * 313 * MPSAFE (for the cache safe does not require fs_token) 314 */ 315 static 316 int 317 hammer_vop_read(struct vop_read_args *ap) 318 { 319 struct hammer_transaction trans; 320 hammer_inode_t ip; 321 hammer_mount_t hmp; 322 off_t offset; 323 struct buf *bp; 324 struct uio *uio; 325 int error; 326 int n; 327 int seqcount; 328 int ioseqcount; 329 int blksize; 330 int bigread; 331 int got_fstoken; 332 333 if (ap->a_vp->v_type != VREG) 334 return (EINVAL); 335 ip = VTOI(ap->a_vp); 336 hmp = ip->hmp; 337 error = 0; 338 uio = ap->a_uio; 339 340 /* 341 * Allow the UIO's size to override the sequential heuristic. 342 */ 343 blksize = hammer_blocksize(uio->uio_offset); 344 seqcount = (uio->uio_resid + (BKVASIZE - 1)) / BKVASIZE; 345 ioseqcount = (ap->a_ioflag >> 16); 346 if (seqcount < ioseqcount) 347 seqcount = ioseqcount; 348 349 /* 350 * If reading or writing a huge amount of data we have to break 351 * atomicy and allow the operation to be interrupted by a signal 352 * or it can DOS the machine. 353 */ 354 bigread = (uio->uio_resid > 100 * 1024 * 1024); 355 got_fstoken = 0; 356 357 /* 358 * Access the data typically in HAMMER_BUFSIZE blocks via the 359 * buffer cache, but HAMMER may use a variable block size based 360 * on the offset. 361 * 362 * XXX Temporary hack, delay the start transaction while we remain 363 * MPSAFE. NOTE: ino_data.size cannot change while vnode is 364 * locked-shared. 365 */ 366 while (uio->uio_resid > 0 && uio->uio_offset < ip->ino_data.size) { 367 int64_t base_offset; 368 int64_t file_limit; 369 370 blksize = hammer_blocksize(uio->uio_offset); 371 offset = (int)uio->uio_offset & (blksize - 1); 372 base_offset = uio->uio_offset - offset; 373 374 if (bigread && (error = hammer_signal_check(ip->hmp)) != 0) 375 break; 376 377 /* 378 * MPSAFE 379 */ 380 bp = getblk(ap->a_vp, base_offset, blksize, 0, 0); 381 if ((bp->b_flags & (B_INVAL | B_CACHE | B_RAM)) == B_CACHE) { 382 bp->b_flags &= ~B_AGE; 383 error = 0; 384 goto skip; 385 } 386 if (ap->a_ioflag & IO_NRDELAY) { 387 bqrelse(bp); 388 return (EWOULDBLOCK); 389 } 390 391 /* 392 * MPUNSAFE 393 */ 394 if (got_fstoken == 0) { 395 lwkt_gettoken(&hmp->fs_token); 396 got_fstoken = 1; 397 hammer_start_transaction(&trans, ip->hmp); 398 } 399 400 /* 401 * NOTE: A valid bp has already been acquired, but was not 402 * B_CACHE. 403 */ 404 if (hammer_cluster_enable) { 405 /* 406 * Use file_limit to prevent cluster_read() from 407 * creating buffers of the wrong block size past 408 * the demarc. 409 */ 410 file_limit = ip->ino_data.size; 411 if (base_offset < HAMMER_XDEMARC && 412 file_limit > HAMMER_XDEMARC) { 413 file_limit = HAMMER_XDEMARC; 414 } 415 error = cluster_readx(ap->a_vp, 416 file_limit, base_offset, 417 blksize, uio->uio_resid, 418 seqcount * BKVASIZE, &bp); 419 } else { 420 error = breadnx(ap->a_vp, base_offset, blksize, 421 NULL, NULL, 0, &bp); 422 } 423 if (error) { 424 brelse(bp); 425 break; 426 } 427 skip: 428 if ((hammer_debug_io & 0x0001) && (bp->b_flags & B_IODEBUG)) { 429 kprintf("doff %016jx read file %016jx@%016jx\n", 430 (intmax_t)bp->b_bio2.bio_offset, 431 (intmax_t)ip->obj_id, 432 (intmax_t)bp->b_loffset); 433 } 434 bp->b_flags &= ~B_IODEBUG; 435 436 bp->b_flags |= B_CLUSTEROK; 437 n = blksize - offset; 438 if (n > uio->uio_resid) 439 n = uio->uio_resid; 440 if (n > ip->ino_data.size - uio->uio_offset) 441 n = (int)(ip->ino_data.size - uio->uio_offset); 442 if (got_fstoken) 443 lwkt_reltoken(&hmp->fs_token); 444 445 /* 446 * Set B_AGE, data has a lower priority than meta-data. 447 * 448 * Use a hold/unlock/drop sequence to run the uiomove 449 * with the buffer unlocked, avoiding deadlocks against 450 * read()s on mmap()'d spaces. 451 */ 452 bp->b_flags |= B_AGE; 453 bqhold(bp); 454 bqrelse(bp); 455 error = uiomove((char *)bp->b_data + offset, n, uio); 456 bqdrop(bp); 457 458 if (got_fstoken) 459 lwkt_gettoken(&hmp->fs_token); 460 461 if (error) 462 break; 463 hammer_stats_file_read += n; 464 } 465 466 /* 467 * Try to update the atime with just the inode lock for maximum 468 * concurrency. If we can't shortcut it we have to get the full 469 * blown transaction. 470 */ 471 if (got_fstoken == 0 && hammer_update_atime_quick(ip) < 0) { 472 lwkt_gettoken(&hmp->fs_token); 473 got_fstoken = 1; 474 hammer_start_transaction(&trans, ip->hmp); 475 } 476 477 if (got_fstoken) { 478 if ((ip->flags & HAMMER_INODE_RO) == 0 && 479 (ip->hmp->mp->mnt_flag & MNT_NOATIME) == 0) { 480 ip->ino_data.atime = trans.time; 481 hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME); 482 } 483 hammer_done_transaction(&trans); 484 lwkt_reltoken(&hmp->fs_token); 485 } 486 return (error); 487 } 488 489 /* 490 * hammer_vop_write { vp, uio, ioflag, cred } 491 */ 492 static 493 int 494 hammer_vop_write(struct vop_write_args *ap) 495 { 496 struct hammer_transaction trans; 497 struct hammer_inode *ip; 498 hammer_mount_t hmp; 499 thread_t td; 500 struct uio *uio; 501 int offset; 502 off_t base_offset; 503 int64_t cluster_eof; 504 struct buf *bp; 505 int kflags; 506 int error; 507 int n; 508 int flags; 509 int seqcount; 510 int bigwrite; 511 512 if (ap->a_vp->v_type != VREG) 513 return (EINVAL); 514 ip = VTOI(ap->a_vp); 515 hmp = ip->hmp; 516 error = 0; 517 kflags = 0; 518 seqcount = ap->a_ioflag >> 16; 519 520 if (ip->flags & HAMMER_INODE_RO) 521 return (EROFS); 522 523 /* 524 * Create a transaction to cover the operations we perform. 525 */ 526 lwkt_gettoken(&hmp->fs_token); 527 hammer_start_transaction(&trans, hmp); 528 uio = ap->a_uio; 529 530 /* 531 * Check append mode 532 */ 533 if (ap->a_ioflag & IO_APPEND) 534 uio->uio_offset = ip->ino_data.size; 535 536 /* 537 * Check for illegal write offsets. Valid range is 0...2^63-1. 538 * 539 * NOTE: the base_off assignment is required to work around what 540 * I consider to be a GCC-4 optimization bug. 541 */ 542 if (uio->uio_offset < 0) { 543 hammer_done_transaction(&trans); 544 lwkt_reltoken(&hmp->fs_token); 545 return (EFBIG); 546 } 547 base_offset = uio->uio_offset + uio->uio_resid; /* work around gcc-4 */ 548 if (uio->uio_resid > 0 && base_offset <= uio->uio_offset) { 549 hammer_done_transaction(&trans); 550 lwkt_reltoken(&hmp->fs_token); 551 return (EFBIG); 552 } 553 554 if (uio->uio_resid > 0 && (td = uio->uio_td) != NULL && td->td_proc && 555 base_offset > td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 556 hammer_done_transaction(&trans); 557 lwkt_reltoken(&hmp->fs_token); 558 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ); 559 return (EFBIG); 560 } 561 562 /* 563 * If reading or writing a huge amount of data we have to break 564 * atomicy and allow the operation to be interrupted by a signal 565 * or it can DOS the machine. 566 * 567 * Preset redo_count so we stop generating REDOs earlier if the 568 * limit is exceeded. 569 */ 570 bigwrite = (uio->uio_resid > 100 * 1024 * 1024); 571 if ((ip->flags & HAMMER_INODE_REDO) && 572 ip->redo_count < hammer_limit_redo) { 573 ip->redo_count += uio->uio_resid; 574 } 575 576 /* 577 * Access the data typically in HAMMER_BUFSIZE blocks via the 578 * buffer cache, but HAMMER may use a variable block size based 579 * on the offset. 580 */ 581 while (uio->uio_resid > 0) { 582 int fixsize = 0; 583 int blksize; 584 int blkmask; 585 int trivial; 586 int endofblk; 587 off_t nsize; 588 589 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE)) != 0) 590 break; 591 if (bigwrite && (error = hammer_signal_check(hmp)) != 0) 592 break; 593 594 blksize = hammer_blocksize(uio->uio_offset); 595 596 /* 597 * Do not allow HAMMER to blow out the buffer cache. Very 598 * large UIOs can lockout other processes due to bwillwrite() 599 * mechanics. 600 * 601 * The hammer inode is not locked during these operations. 602 * The vnode is locked which can interfere with the pageout 603 * daemon for non-UIO_NOCOPY writes but should not interfere 604 * with the buffer cache. Even so, we cannot afford to 605 * allow the pageout daemon to build up too many dirty buffer 606 * cache buffers. 607 * 608 * Only call this if we aren't being recursively called from 609 * a virtual disk device (vn), else we may deadlock. 610 */ 611 if ((ap->a_ioflag & IO_RECURSE) == 0) 612 bwillwrite(blksize); 613 614 /* 615 * Control the number of pending records associated with 616 * this inode. If too many have accumulated start a 617 * flush. Try to maintain a pipeline with the flusher. 618 * 619 * NOTE: It is possible for other sources to grow the 620 * records but not necessarily issue another flush, 621 * so use a timeout and ensure that a re-flush occurs. 622 */ 623 if (ip->rsv_recs >= hammer_limit_inode_recs) { 624 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 625 while (ip->rsv_recs >= hammer_limit_inode_recs * 2) { 626 ip->flags |= HAMMER_INODE_RECSW; 627 tsleep(&ip->rsv_recs, 0, "hmrwww", hz); 628 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 629 } 630 } 631 632 #if 0 633 /* 634 * Do not allow HAMMER to blow out system memory by 635 * accumulating too many records. Records are so well 636 * decoupled from the buffer cache that it is possible 637 * for userland to push data out to the media via 638 * direct-write, but build up the records queued to the 639 * backend faster then the backend can flush them out. 640 * HAMMER has hit its write limit but the frontend has 641 * no pushback to slow it down. 642 */ 643 if (hmp->rsv_recs > hammer_limit_recs / 2) { 644 /* 645 * Get the inode on the flush list 646 */ 647 if (ip->rsv_recs >= 64) 648 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 649 else if (ip->rsv_recs >= 16) 650 hammer_flush_inode(ip, 0); 651 652 /* 653 * Keep the flusher going if the system keeps 654 * queueing records. 655 */ 656 delta = hmp->count_newrecords - 657 hmp->last_newrecords; 658 if (delta < 0 || delta > hammer_limit_recs / 2) { 659 hmp->last_newrecords = hmp->count_newrecords; 660 hammer_sync_hmp(hmp, MNT_NOWAIT); 661 } 662 663 /* 664 * If we have gotten behind start slowing 665 * down the writers. 666 */ 667 delta = (hmp->rsv_recs - hammer_limit_recs) * 668 hz / hammer_limit_recs; 669 if (delta > 0) 670 tsleep(&trans, 0, "hmrslo", delta); 671 } 672 #endif 673 674 /* 675 * Calculate the blocksize at the current offset and figure 676 * out how much we can actually write. 677 */ 678 blkmask = blksize - 1; 679 offset = (int)uio->uio_offset & blkmask; 680 base_offset = uio->uio_offset & ~(int64_t)blkmask; 681 n = blksize - offset; 682 if (n > uio->uio_resid) { 683 n = uio->uio_resid; 684 endofblk = 0; 685 } else { 686 endofblk = 1; 687 } 688 nsize = uio->uio_offset + n; 689 if (nsize > ip->ino_data.size) { 690 if (uio->uio_offset > ip->ino_data.size) 691 trivial = 0; 692 else 693 trivial = 1; 694 nvextendbuf(ap->a_vp, 695 ip->ino_data.size, 696 nsize, 697 hammer_blocksize(ip->ino_data.size), 698 hammer_blocksize(nsize), 699 hammer_blockoff(ip->ino_data.size), 700 hammer_blockoff(nsize), 701 trivial); 702 fixsize = 1; 703 kflags |= NOTE_EXTEND; 704 } 705 706 if (uio->uio_segflg == UIO_NOCOPY) { 707 /* 708 * Issuing a write with the same data backing the 709 * buffer. Instantiate the buffer to collect the 710 * backing vm pages, then read-in any missing bits. 711 * 712 * This case is used by vop_stdputpages(). 713 */ 714 bp = getblk(ap->a_vp, base_offset, 715 blksize, GETBLK_BHEAVY, 0); 716 if ((bp->b_flags & B_CACHE) == 0) { 717 bqrelse(bp); 718 error = bread(ap->a_vp, base_offset, 719 blksize, &bp); 720 } 721 } else if (offset == 0 && uio->uio_resid >= blksize) { 722 /* 723 * Even though we are entirely overwriting the buffer 724 * we may still have to zero it out to avoid a 725 * mmap/write visibility issue. 726 */ 727 bp = getblk(ap->a_vp, base_offset, blksize, GETBLK_BHEAVY, 0); 728 if ((bp->b_flags & B_CACHE) == 0) 729 vfs_bio_clrbuf(bp); 730 } else if (base_offset >= ip->ino_data.size) { 731 /* 732 * If the base offset of the buffer is beyond the 733 * file EOF, we don't have to issue a read. 734 */ 735 bp = getblk(ap->a_vp, base_offset, 736 blksize, GETBLK_BHEAVY, 0); 737 vfs_bio_clrbuf(bp); 738 } else { 739 /* 740 * Partial overwrite, read in any missing bits then 741 * replace the portion being written. 742 */ 743 error = bread(ap->a_vp, base_offset, blksize, &bp); 744 if (error == 0) 745 bheavy(bp); 746 } 747 if (error == 0) { 748 lwkt_reltoken(&hmp->fs_token); 749 error = uiomove(bp->b_data + offset, n, uio); 750 lwkt_gettoken(&hmp->fs_token); 751 } 752 753 /* 754 * Generate REDO records if enabled and redo_count will not 755 * exceeded the limit. 756 * 757 * If redo_count exceeds the limit we stop generating records 758 * and clear HAMMER_INODE_REDO. This will cause the next 759 * fsync() to do a full meta-data sync instead of just an 760 * UNDO/REDO fifo update. 761 * 762 * When clearing HAMMER_INODE_REDO any pre-existing REDOs 763 * will still be tracked. The tracks will be terminated 764 * when the related meta-data (including possible data 765 * modifications which are not tracked via REDO) is 766 * flushed. 767 */ 768 if ((ip->flags & HAMMER_INODE_REDO) && error == 0) { 769 if (ip->redo_count < hammer_limit_redo) { 770 bp->b_flags |= B_VFSFLAG1; 771 error = hammer_generate_redo(&trans, ip, 772 base_offset + offset, 773 HAMMER_REDO_WRITE, 774 bp->b_data + offset, 775 (size_t)n); 776 } else { 777 ip->flags &= ~HAMMER_INODE_REDO; 778 } 779 } 780 781 /* 782 * If we screwed up we have to undo any VM size changes we 783 * made. 784 */ 785 if (error) { 786 brelse(bp); 787 if (fixsize) { 788 nvtruncbuf(ap->a_vp, ip->ino_data.size, 789 hammer_blocksize(ip->ino_data.size), 790 hammer_blockoff(ip->ino_data.size), 791 0); 792 } 793 break; 794 } 795 kflags |= NOTE_WRITE; 796 hammer_stats_file_write += n; 797 bp->b_flags |= B_CLUSTEROK; 798 if (ip->ino_data.size < uio->uio_offset) { 799 ip->ino_data.size = uio->uio_offset; 800 flags = HAMMER_INODE_SDIRTY; 801 } else { 802 flags = 0; 803 } 804 ip->ino_data.mtime = trans.time; 805 flags |= HAMMER_INODE_MTIME | HAMMER_INODE_BUFS; 806 hammer_modify_inode(&trans, ip, flags); 807 808 /* 809 * Once we dirty the buffer any cached zone-X offset 810 * becomes invalid. HAMMER NOTE: no-history mode cannot 811 * allow overwriting over the same data sector unless 812 * we provide UNDOs for the old data, which we don't. 813 */ 814 bp->b_bio2.bio_offset = NOOFFSET; 815 816 /* 817 * Final buffer disposition. 818 * 819 * Because meta-data updates are deferred, HAMMER is 820 * especially sensitive to excessive bdwrite()s because 821 * the I/O stream is not broken up by disk reads. So the 822 * buffer cache simply cannot keep up. 823 * 824 * WARNING! blksize is variable. cluster_write() is 825 * expected to not blow up if it encounters 826 * buffers that do not match the passed blksize. 827 * 828 * NOTE! Hammer shouldn't need to bawrite()/cluster_write(). 829 * The ip->rsv_recs check should burst-flush the data. 830 * If we queue it immediately the buf could be left 831 * locked on the device queue for a very long time. 832 * 833 * However, failing to flush a dirty buffer out when 834 * issued from the pageout daemon can result in a low 835 * memory deadlock against bio_page_alloc(), so we 836 * have to bawrite() on IO_ASYNC as well. 837 * 838 * NOTE! To avoid degenerate stalls due to mismatched block 839 * sizes we only honor IO_DIRECT on the write which 840 * abuts the end of the buffer. However, we must 841 * honor IO_SYNC in case someone is silly enough to 842 * configure a HAMMER file as swap, or when HAMMER 843 * is serving NFS (for commits). Ick ick. 844 */ 845 bp->b_flags |= B_AGE | B_CLUSTEROK; 846 if (ap->a_ioflag & IO_SYNC) { 847 bwrite(bp); 848 } else if ((ap->a_ioflag & IO_DIRECT) && endofblk) { 849 bawrite(bp); 850 } else if (ap->a_ioflag & IO_ASYNC) { 851 bawrite(bp); 852 } else if (hammer_cluster_enable && 853 !(ap->a_vp->v_mount->mnt_flag & MNT_NOCLUSTERW)) { 854 if (base_offset < HAMMER_XDEMARC) 855 cluster_eof = hammer_blockdemarc(base_offset, 856 ip->ino_data.size); 857 else 858 cluster_eof = ip->ino_data.size; 859 cluster_write(bp, cluster_eof, blksize, seqcount); 860 } else { 861 bdwrite(bp); 862 } 863 } 864 hammer_done_transaction(&trans); 865 hammer_knote(ap->a_vp, kflags); 866 lwkt_reltoken(&hmp->fs_token); 867 return (error); 868 } 869 870 /* 871 * hammer_vop_access { vp, mode, cred } 872 * 873 * MPSAFE - does not require fs_token 874 */ 875 static 876 int 877 hammer_vop_access(struct vop_access_args *ap) 878 { 879 struct hammer_inode *ip = VTOI(ap->a_vp); 880 uid_t uid; 881 gid_t gid; 882 int error; 883 884 ++hammer_stats_file_iopsr; 885 uid = hammer_to_unix_xid(&ip->ino_data.uid); 886 gid = hammer_to_unix_xid(&ip->ino_data.gid); 887 888 error = vop_helper_access(ap, uid, gid, ip->ino_data.mode, 889 ip->ino_data.uflags); 890 return (error); 891 } 892 893 /* 894 * hammer_vop_advlock { vp, id, op, fl, flags } 895 * 896 * MPSAFE - does not require fs_token 897 */ 898 static 899 int 900 hammer_vop_advlock(struct vop_advlock_args *ap) 901 { 902 hammer_inode_t ip = VTOI(ap->a_vp); 903 904 return (lf_advlock(ap, &ip->advlock, ip->ino_data.size)); 905 } 906 907 /* 908 * hammer_vop_close { vp, fflag } 909 * 910 * We can only sync-on-close for normal closes. XXX disabled for now. 911 */ 912 static 913 int 914 hammer_vop_close(struct vop_close_args *ap) 915 { 916 #if 0 917 struct vnode *vp = ap->a_vp; 918 hammer_inode_t ip = VTOI(vp); 919 int waitfor; 920 if (ip->flags & (HAMMER_INODE_CLOSESYNC|HAMMER_INODE_CLOSEASYNC)) { 921 if (vn_islocked(vp) == LK_EXCLUSIVE && 922 (vp->v_flag & (VINACTIVE|VRECLAIMED)) == 0) { 923 if (ip->flags & HAMMER_INODE_CLOSESYNC) 924 waitfor = MNT_WAIT; 925 else 926 waitfor = MNT_NOWAIT; 927 ip->flags &= ~(HAMMER_INODE_CLOSESYNC | 928 HAMMER_INODE_CLOSEASYNC); 929 VOP_FSYNC(vp, MNT_NOWAIT, waitfor); 930 } 931 } 932 #endif 933 return (vop_stdclose(ap)); 934 } 935 936 /* 937 * hammer_vop_ncreate { nch, dvp, vpp, cred, vap } 938 * 939 * The operating system has already ensured that the directory entry 940 * does not exist and done all appropriate namespace locking. 941 */ 942 static 943 int 944 hammer_vop_ncreate(struct vop_ncreate_args *ap) 945 { 946 struct hammer_transaction trans; 947 struct hammer_inode *dip; 948 struct hammer_inode *nip; 949 struct nchandle *nch; 950 hammer_mount_t hmp; 951 int error; 952 953 nch = ap->a_nch; 954 dip = VTOI(ap->a_dvp); 955 hmp = dip->hmp; 956 957 if (dip->flags & HAMMER_INODE_RO) 958 return (EROFS); 959 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 960 return (error); 961 962 /* 963 * Create a transaction to cover the operations we perform. 964 */ 965 lwkt_gettoken(&hmp->fs_token); 966 hammer_start_transaction(&trans, hmp); 967 ++hammer_stats_file_iopsw; 968 969 /* 970 * Create a new filesystem object of the requested type. The 971 * returned inode will be referenced and shared-locked to prevent 972 * it from being moved to the flusher. 973 */ 974 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 975 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 976 NULL, &nip); 977 if (error) { 978 hkprintf("hammer_create_inode error %d\n", error); 979 hammer_done_transaction(&trans); 980 *ap->a_vpp = NULL; 981 lwkt_reltoken(&hmp->fs_token); 982 return (error); 983 } 984 985 /* 986 * Add the new filesystem object to the directory. This will also 987 * bump the inode's link count. 988 */ 989 error = hammer_ip_add_directory(&trans, dip, 990 nch->ncp->nc_name, nch->ncp->nc_nlen, 991 nip); 992 if (error) 993 hkprintf("hammer_ip_add_directory error %d\n", error); 994 995 /* 996 * Finish up. 997 */ 998 if (error) { 999 hammer_rel_inode(nip, 0); 1000 hammer_done_transaction(&trans); 1001 *ap->a_vpp = NULL; 1002 } else { 1003 error = hammer_get_vnode(nip, ap->a_vpp); 1004 hammer_done_transaction(&trans); 1005 hammer_rel_inode(nip, 0); 1006 if (error == 0) { 1007 cache_setunresolved(ap->a_nch); 1008 cache_setvp(ap->a_nch, *ap->a_vpp); 1009 } 1010 hammer_knote(ap->a_dvp, NOTE_WRITE); 1011 } 1012 lwkt_reltoken(&hmp->fs_token); 1013 return (error); 1014 } 1015 1016 /* 1017 * hammer_vop_getattr { vp, vap } 1018 * 1019 * Retrieve an inode's attribute information. When accessing inodes 1020 * historically we fake the atime field to ensure consistent results. 1021 * The atime field is stored in the B-Tree element and allowed to be 1022 * updated without cycling the element. 1023 * 1024 * MPSAFE - does not require fs_token 1025 */ 1026 static 1027 int 1028 hammer_vop_getattr(struct vop_getattr_args *ap) 1029 { 1030 struct hammer_inode *ip = VTOI(ap->a_vp); 1031 struct vattr *vap = ap->a_vap; 1032 1033 /* 1034 * We want the fsid to be different when accessing a filesystem 1035 * with different as-of's so programs like diff don't think 1036 * the files are the same. 1037 * 1038 * We also want the fsid to be the same when comparing snapshots, 1039 * or when comparing mirrors (which might be backed by different 1040 * physical devices). HAMMER fsids are based on the PFS's 1041 * shared_uuid field. 1042 * 1043 * XXX there is a chance of collision here. The va_fsid reported 1044 * by stat is different from the more involved fsid used in the 1045 * mount structure. 1046 */ 1047 ++hammer_stats_file_iopsr; 1048 hammer_lock_sh(&ip->lock); 1049 vap->va_fsid = ip->pfsm->fsid_udev ^ (u_int32_t)ip->obj_asof ^ 1050 (u_int32_t)(ip->obj_asof >> 32); 1051 1052 vap->va_fileid = ip->ino_leaf.base.obj_id; 1053 vap->va_mode = ip->ino_data.mode; 1054 vap->va_nlink = ip->ino_data.nlinks; 1055 vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid); 1056 vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid); 1057 vap->va_rmajor = 0; 1058 vap->va_rminor = 0; 1059 vap->va_size = ip->ino_data.size; 1060 1061 /* 1062 * Special case for @@PFS softlinks. The actual size of the 1063 * expanded softlink is "@@0x%016llx:%05d" == 26 bytes. 1064 * or for MAX_TID is "@@-1:%05d" == 10 bytes. 1065 */ 1066 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_SOFTLINK && 1067 ip->ino_data.size == 10 && 1068 ip->obj_asof == HAMMER_MAX_TID && 1069 ip->obj_localization == 0 && 1070 strncmp(ip->ino_data.ext.symlink, "@@PFS", 5) == 0) { 1071 if (ip->pfsm->pfsd.mirror_flags & HAMMER_PFSD_SLAVE) 1072 vap->va_size = 26; 1073 else 1074 vap->va_size = 10; 1075 } 1076 1077 /* 1078 * We must provide a consistent atime and mtime for snapshots 1079 * so people can do a 'tar cf - ... | md5' on them and get 1080 * consistent results. 1081 */ 1082 if (ip->flags & HAMMER_INODE_RO) { 1083 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_atime); 1084 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_mtime); 1085 } else { 1086 hammer_time_to_timespec(ip->ino_data.atime, &vap->va_atime); 1087 hammer_time_to_timespec(ip->ino_data.mtime, &vap->va_mtime); 1088 } 1089 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_ctime); 1090 vap->va_flags = ip->ino_data.uflags; 1091 vap->va_gen = 1; /* hammer inums are unique for all time */ 1092 vap->va_blocksize = HAMMER_BUFSIZE; 1093 if (ip->ino_data.size >= HAMMER_XDEMARC) { 1094 vap->va_bytes = (ip->ino_data.size + HAMMER_XBUFMASK64) & 1095 ~HAMMER_XBUFMASK64; 1096 } else if (ip->ino_data.size > HAMMER_BUFSIZE / 2) { 1097 vap->va_bytes = (ip->ino_data.size + HAMMER_BUFMASK64) & 1098 ~HAMMER_BUFMASK64; 1099 } else { 1100 vap->va_bytes = (ip->ino_data.size + 15) & ~15; 1101 } 1102 1103 vap->va_type = hammer_get_vnode_type(ip->ino_data.obj_type); 1104 vap->va_filerev = 0; /* XXX */ 1105 vap->va_uid_uuid = ip->ino_data.uid; 1106 vap->va_gid_uuid = ip->ino_data.gid; 1107 vap->va_fsid_uuid = ip->hmp->fsid; 1108 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID | 1109 VA_FSID_UUID_VALID; 1110 1111 switch (ip->ino_data.obj_type) { 1112 case HAMMER_OBJTYPE_CDEV: 1113 case HAMMER_OBJTYPE_BDEV: 1114 vap->va_rmajor = ip->ino_data.rmajor; 1115 vap->va_rminor = ip->ino_data.rminor; 1116 break; 1117 default: 1118 break; 1119 } 1120 hammer_unlock(&ip->lock); 1121 return(0); 1122 } 1123 1124 /* 1125 * hammer_vop_nresolve { nch, dvp, cred } 1126 * 1127 * Locate the requested directory entry. 1128 */ 1129 static 1130 int 1131 hammer_vop_nresolve(struct vop_nresolve_args *ap) 1132 { 1133 struct hammer_transaction trans; 1134 struct namecache *ncp; 1135 hammer_mount_t hmp; 1136 hammer_inode_t dip; 1137 hammer_inode_t ip; 1138 hammer_tid_t asof; 1139 struct hammer_cursor cursor; 1140 struct vnode *vp; 1141 int64_t namekey; 1142 int error; 1143 int i; 1144 int nlen; 1145 int flags; 1146 int ispfs; 1147 int64_t obj_id; 1148 u_int32_t localization; 1149 u_int32_t max_iterations; 1150 1151 /* 1152 * Misc initialization, plus handle as-of name extensions. Look for 1153 * the '@@' extension. Note that as-of files and directories cannot 1154 * be modified. 1155 */ 1156 dip = VTOI(ap->a_dvp); 1157 ncp = ap->a_nch->ncp; 1158 asof = dip->obj_asof; 1159 localization = dip->obj_localization; /* for code consistency */ 1160 nlen = ncp->nc_nlen; 1161 flags = dip->flags & HAMMER_INODE_RO; 1162 ispfs = 0; 1163 hmp = dip->hmp; 1164 1165 lwkt_gettoken(&hmp->fs_token); 1166 hammer_simple_transaction(&trans, hmp); 1167 ++hammer_stats_file_iopsr; 1168 1169 for (i = 0; i < nlen; ++i) { 1170 if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') { 1171 error = hammer_str_to_tid(ncp->nc_name + i + 2, 1172 &ispfs, &asof, &localization); 1173 if (error != 0) { 1174 i = nlen; 1175 break; 1176 } 1177 if (asof != HAMMER_MAX_TID) 1178 flags |= HAMMER_INODE_RO; 1179 break; 1180 } 1181 } 1182 nlen = i; 1183 1184 /* 1185 * If this is a PFS softlink we dive into the PFS 1186 */ 1187 if (ispfs && nlen == 0) { 1188 ip = hammer_get_inode(&trans, dip, HAMMER_OBJID_ROOT, 1189 asof, localization, 1190 flags, &error); 1191 if (error == 0) { 1192 error = hammer_get_vnode(ip, &vp); 1193 hammer_rel_inode(ip, 0); 1194 } else { 1195 vp = NULL; 1196 } 1197 if (error == 0) { 1198 vn_unlock(vp); 1199 cache_setvp(ap->a_nch, vp); 1200 vrele(vp); 1201 } 1202 goto done; 1203 } 1204 1205 /* 1206 * If there is no path component the time extension is relative to dip. 1207 * e.g. "fubar/@@<snapshot>" 1208 * 1209 * "." is handled by the kernel, but ".@@<snapshot>" is not. 1210 * e.g. "fubar/.@@<snapshot>" 1211 * 1212 * ".." is handled by the kernel. We do not currently handle 1213 * "..@<snapshot>". 1214 */ 1215 if (nlen == 0 || (nlen == 1 && ncp->nc_name[0] == '.')) { 1216 ip = hammer_get_inode(&trans, dip, dip->obj_id, 1217 asof, dip->obj_localization, 1218 flags, &error); 1219 if (error == 0) { 1220 error = hammer_get_vnode(ip, &vp); 1221 hammer_rel_inode(ip, 0); 1222 } else { 1223 vp = NULL; 1224 } 1225 if (error == 0) { 1226 vn_unlock(vp); 1227 cache_setvp(ap->a_nch, vp); 1228 vrele(vp); 1229 } 1230 goto done; 1231 } 1232 1233 /* 1234 * Calculate the namekey and setup the key range for the scan. This 1235 * works kinda like a chained hash table where the lower 32 bits 1236 * of the namekey synthesize the chain. 1237 * 1238 * The key range is inclusive of both key_beg and key_end. 1239 */ 1240 namekey = hammer_directory_namekey(dip, ncp->nc_name, nlen, 1241 &max_iterations); 1242 1243 error = hammer_init_cursor(&trans, &cursor, &dip->cache[1], dip); 1244 cursor.key_beg.localization = dip->obj_localization + 1245 hammer_dir_localization(dip); 1246 cursor.key_beg.obj_id = dip->obj_id; 1247 cursor.key_beg.key = namekey; 1248 cursor.key_beg.create_tid = 0; 1249 cursor.key_beg.delete_tid = 0; 1250 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 1251 cursor.key_beg.obj_type = 0; 1252 1253 cursor.key_end = cursor.key_beg; 1254 cursor.key_end.key += max_iterations; 1255 cursor.asof = asof; 1256 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 1257 1258 /* 1259 * Scan all matching records (the chain), locate the one matching 1260 * the requested path component. 1261 * 1262 * The hammer_ip_*() functions merge in-memory records with on-disk 1263 * records for the purposes of the search. 1264 */ 1265 obj_id = 0; 1266 localization = HAMMER_DEF_LOCALIZATION; 1267 1268 if (error == 0) { 1269 error = hammer_ip_first(&cursor); 1270 while (error == 0) { 1271 error = hammer_ip_resolve_data(&cursor); 1272 if (error) 1273 break; 1274 if (nlen == cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF && 1275 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) { 1276 obj_id = cursor.data->entry.obj_id; 1277 localization = cursor.data->entry.localization; 1278 break; 1279 } 1280 error = hammer_ip_next(&cursor); 1281 } 1282 } 1283 hammer_done_cursor(&cursor); 1284 1285 /* 1286 * Lookup the obj_id. This should always succeed. If it does not 1287 * the filesystem may be damaged and we return a dummy inode. 1288 */ 1289 if (error == 0) { 1290 ip = hammer_get_inode(&trans, dip, obj_id, 1291 asof, localization, 1292 flags, &error); 1293 if (error == ENOENT) { 1294 kprintf("HAMMER: WARNING: Missing " 1295 "inode for dirent \"%s\"\n" 1296 "\tobj_id = %016llx, asof=%016llx, lo=%08x\n", 1297 ncp->nc_name, 1298 (long long)obj_id, (long long)asof, 1299 localization); 1300 error = 0; 1301 ip = hammer_get_dummy_inode(&trans, dip, obj_id, 1302 asof, localization, 1303 flags, &error); 1304 } 1305 if (error == 0) { 1306 error = hammer_get_vnode(ip, &vp); 1307 hammer_rel_inode(ip, 0); 1308 } else { 1309 vp = NULL; 1310 } 1311 if (error == 0) { 1312 vn_unlock(vp); 1313 cache_setvp(ap->a_nch, vp); 1314 vrele(vp); 1315 } 1316 } else if (error == ENOENT) { 1317 cache_setvp(ap->a_nch, NULL); 1318 } 1319 done: 1320 hammer_done_transaction(&trans); 1321 lwkt_reltoken(&hmp->fs_token); 1322 return (error); 1323 } 1324 1325 /* 1326 * hammer_vop_nlookupdotdot { dvp, vpp, cred } 1327 * 1328 * Locate the parent directory of a directory vnode. 1329 * 1330 * dvp is referenced but not locked. *vpp must be returned referenced and 1331 * locked. A parent_obj_id of 0 does not necessarily indicate that we are 1332 * at the root, instead it could indicate that the directory we were in was 1333 * removed. 1334 * 1335 * NOTE: as-of sequences are not linked into the directory structure. If 1336 * we are at the root with a different asof then the mount point, reload 1337 * the same directory with the mount point's asof. I'm not sure what this 1338 * will do to NFS. We encode ASOF stamps in NFS file handles so it might not 1339 * get confused, but it hasn't been tested. 1340 */ 1341 static 1342 int 1343 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap) 1344 { 1345 struct hammer_transaction trans; 1346 struct hammer_inode *dip; 1347 struct hammer_inode *ip; 1348 hammer_mount_t hmp; 1349 int64_t parent_obj_id; 1350 u_int32_t parent_obj_localization; 1351 hammer_tid_t asof; 1352 int error; 1353 1354 dip = VTOI(ap->a_dvp); 1355 asof = dip->obj_asof; 1356 hmp = dip->hmp; 1357 1358 /* 1359 * Whos are parent? This could be the root of a pseudo-filesystem 1360 * whos parent is in another localization domain. 1361 */ 1362 lwkt_gettoken(&hmp->fs_token); 1363 parent_obj_id = dip->ino_data.parent_obj_id; 1364 if (dip->obj_id == HAMMER_OBJID_ROOT) 1365 parent_obj_localization = dip->ino_data.ext.obj.parent_obj_localization; 1366 else 1367 parent_obj_localization = dip->obj_localization; 1368 1369 if (parent_obj_id == 0) { 1370 if (dip->obj_id == HAMMER_OBJID_ROOT && 1371 asof != hmp->asof) { 1372 parent_obj_id = dip->obj_id; 1373 asof = hmp->asof; 1374 *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK); 1375 ksnprintf(*ap->a_fakename, 19, "0x%016llx", 1376 (long long)dip->obj_asof); 1377 } else { 1378 *ap->a_vpp = NULL; 1379 lwkt_reltoken(&hmp->fs_token); 1380 return ENOENT; 1381 } 1382 } 1383 1384 hammer_simple_transaction(&trans, hmp); 1385 ++hammer_stats_file_iopsr; 1386 1387 ip = hammer_get_inode(&trans, dip, parent_obj_id, 1388 asof, parent_obj_localization, 1389 dip->flags, &error); 1390 if (ip) { 1391 error = hammer_get_vnode(ip, ap->a_vpp); 1392 hammer_rel_inode(ip, 0); 1393 } else { 1394 *ap->a_vpp = NULL; 1395 } 1396 hammer_done_transaction(&trans); 1397 lwkt_reltoken(&hmp->fs_token); 1398 return (error); 1399 } 1400 1401 /* 1402 * hammer_vop_nlink { nch, dvp, vp, cred } 1403 */ 1404 static 1405 int 1406 hammer_vop_nlink(struct vop_nlink_args *ap) 1407 { 1408 struct hammer_transaction trans; 1409 struct hammer_inode *dip; 1410 struct hammer_inode *ip; 1411 struct nchandle *nch; 1412 hammer_mount_t hmp; 1413 int error; 1414 1415 if (ap->a_dvp->v_mount != ap->a_vp->v_mount) 1416 return(EXDEV); 1417 1418 nch = ap->a_nch; 1419 dip = VTOI(ap->a_dvp); 1420 ip = VTOI(ap->a_vp); 1421 hmp = dip->hmp; 1422 1423 if (dip->obj_localization != ip->obj_localization) 1424 return(EXDEV); 1425 1426 if (dip->flags & HAMMER_INODE_RO) 1427 return (EROFS); 1428 if (ip->flags & HAMMER_INODE_RO) 1429 return (EROFS); 1430 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1431 return (error); 1432 1433 /* 1434 * Create a transaction to cover the operations we perform. 1435 */ 1436 lwkt_gettoken(&hmp->fs_token); 1437 hammer_start_transaction(&trans, hmp); 1438 ++hammer_stats_file_iopsw; 1439 1440 /* 1441 * Add the filesystem object to the directory. Note that neither 1442 * dip nor ip are referenced or locked, but their vnodes are 1443 * referenced. This function will bump the inode's link count. 1444 */ 1445 error = hammer_ip_add_directory(&trans, dip, 1446 nch->ncp->nc_name, nch->ncp->nc_nlen, 1447 ip); 1448 1449 /* 1450 * Finish up. 1451 */ 1452 if (error == 0) { 1453 cache_setunresolved(nch); 1454 cache_setvp(nch, ap->a_vp); 1455 } 1456 hammer_done_transaction(&trans); 1457 hammer_knote(ap->a_vp, NOTE_LINK); 1458 hammer_knote(ap->a_dvp, NOTE_WRITE); 1459 lwkt_reltoken(&hmp->fs_token); 1460 return (error); 1461 } 1462 1463 /* 1464 * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap } 1465 * 1466 * The operating system has already ensured that the directory entry 1467 * does not exist and done all appropriate namespace locking. 1468 */ 1469 static 1470 int 1471 hammer_vop_nmkdir(struct vop_nmkdir_args *ap) 1472 { 1473 struct hammer_transaction trans; 1474 struct hammer_inode *dip; 1475 struct hammer_inode *nip; 1476 struct nchandle *nch; 1477 hammer_mount_t hmp; 1478 int error; 1479 1480 nch = ap->a_nch; 1481 dip = VTOI(ap->a_dvp); 1482 hmp = dip->hmp; 1483 1484 if (dip->flags & HAMMER_INODE_RO) 1485 return (EROFS); 1486 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1487 return (error); 1488 1489 /* 1490 * Create a transaction to cover the operations we perform. 1491 */ 1492 lwkt_gettoken(&hmp->fs_token); 1493 hammer_start_transaction(&trans, hmp); 1494 ++hammer_stats_file_iopsw; 1495 1496 /* 1497 * Create a new filesystem object of the requested type. The 1498 * returned inode will be referenced but not locked. 1499 */ 1500 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 1501 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 1502 NULL, &nip); 1503 if (error) { 1504 hkprintf("hammer_mkdir error %d\n", error); 1505 hammer_done_transaction(&trans); 1506 *ap->a_vpp = NULL; 1507 lwkt_reltoken(&hmp->fs_token); 1508 return (error); 1509 } 1510 /* 1511 * Add the new filesystem object to the directory. This will also 1512 * bump the inode's link count. 1513 */ 1514 error = hammer_ip_add_directory(&trans, dip, 1515 nch->ncp->nc_name, nch->ncp->nc_nlen, 1516 nip); 1517 if (error) 1518 hkprintf("hammer_mkdir (add) error %d\n", error); 1519 1520 /* 1521 * Finish up. 1522 */ 1523 if (error) { 1524 hammer_rel_inode(nip, 0); 1525 *ap->a_vpp = NULL; 1526 } else { 1527 error = hammer_get_vnode(nip, ap->a_vpp); 1528 hammer_rel_inode(nip, 0); 1529 if (error == 0) { 1530 cache_setunresolved(ap->a_nch); 1531 cache_setvp(ap->a_nch, *ap->a_vpp); 1532 } 1533 } 1534 hammer_done_transaction(&trans); 1535 if (error == 0) 1536 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1537 lwkt_reltoken(&hmp->fs_token); 1538 return (error); 1539 } 1540 1541 /* 1542 * hammer_vop_nmknod { nch, dvp, vpp, cred, vap } 1543 * 1544 * The operating system has already ensured that the directory entry 1545 * does not exist and done all appropriate namespace locking. 1546 */ 1547 static 1548 int 1549 hammer_vop_nmknod(struct vop_nmknod_args *ap) 1550 { 1551 struct hammer_transaction trans; 1552 struct hammer_inode *dip; 1553 struct hammer_inode *nip; 1554 struct nchandle *nch; 1555 hammer_mount_t hmp; 1556 int error; 1557 1558 nch = ap->a_nch; 1559 dip = VTOI(ap->a_dvp); 1560 hmp = dip->hmp; 1561 1562 if (dip->flags & HAMMER_INODE_RO) 1563 return (EROFS); 1564 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1565 return (error); 1566 1567 /* 1568 * Create a transaction to cover the operations we perform. 1569 */ 1570 lwkt_gettoken(&hmp->fs_token); 1571 hammer_start_transaction(&trans, hmp); 1572 ++hammer_stats_file_iopsw; 1573 1574 /* 1575 * Create a new filesystem object of the requested type. The 1576 * returned inode will be referenced but not locked. 1577 * 1578 * If mknod specifies a directory a pseudo-fs is created. 1579 */ 1580 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 1581 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 1582 NULL, &nip); 1583 if (error) { 1584 hammer_done_transaction(&trans); 1585 *ap->a_vpp = NULL; 1586 lwkt_reltoken(&hmp->fs_token); 1587 return (error); 1588 } 1589 1590 /* 1591 * Add the new filesystem object to the directory. This will also 1592 * bump the inode's link count. 1593 */ 1594 error = hammer_ip_add_directory(&trans, dip, 1595 nch->ncp->nc_name, nch->ncp->nc_nlen, 1596 nip); 1597 1598 /* 1599 * Finish up. 1600 */ 1601 if (error) { 1602 hammer_rel_inode(nip, 0); 1603 *ap->a_vpp = NULL; 1604 } else { 1605 error = hammer_get_vnode(nip, ap->a_vpp); 1606 hammer_rel_inode(nip, 0); 1607 if (error == 0) { 1608 cache_setunresolved(ap->a_nch); 1609 cache_setvp(ap->a_nch, *ap->a_vpp); 1610 } 1611 } 1612 hammer_done_transaction(&trans); 1613 if (error == 0) 1614 hammer_knote(ap->a_dvp, NOTE_WRITE); 1615 lwkt_reltoken(&hmp->fs_token); 1616 return (error); 1617 } 1618 1619 /* 1620 * hammer_vop_open { vp, mode, cred, fp } 1621 * 1622 * MPSAFE (does not require fs_token) 1623 */ 1624 static 1625 int 1626 hammer_vop_open(struct vop_open_args *ap) 1627 { 1628 hammer_inode_t ip; 1629 1630 ++hammer_stats_file_iopsr; 1631 ip = VTOI(ap->a_vp); 1632 1633 if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO)) 1634 return (EROFS); 1635 return(vop_stdopen(ap)); 1636 } 1637 1638 /* 1639 * hammer_vop_print { vp } 1640 */ 1641 static 1642 int 1643 hammer_vop_print(struct vop_print_args *ap) 1644 { 1645 return EOPNOTSUPP; 1646 } 1647 1648 /* 1649 * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies } 1650 */ 1651 static 1652 int 1653 hammer_vop_readdir(struct vop_readdir_args *ap) 1654 { 1655 struct hammer_transaction trans; 1656 struct hammer_cursor cursor; 1657 struct hammer_inode *ip; 1658 hammer_mount_t hmp; 1659 struct uio *uio; 1660 hammer_base_elm_t base; 1661 int error; 1662 int cookie_index; 1663 int ncookies; 1664 off_t *cookies; 1665 off_t saveoff; 1666 int r; 1667 int dtype; 1668 1669 ++hammer_stats_file_iopsr; 1670 ip = VTOI(ap->a_vp); 1671 uio = ap->a_uio; 1672 saveoff = uio->uio_offset; 1673 hmp = ip->hmp; 1674 1675 if (ap->a_ncookies) { 1676 ncookies = uio->uio_resid / 16 + 1; 1677 if (ncookies > 1024) 1678 ncookies = 1024; 1679 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 1680 cookie_index = 0; 1681 } else { 1682 ncookies = -1; 1683 cookies = NULL; 1684 cookie_index = 0; 1685 } 1686 1687 lwkt_gettoken(&hmp->fs_token); 1688 hammer_simple_transaction(&trans, hmp); 1689 1690 /* 1691 * Handle artificial entries 1692 * 1693 * It should be noted that the minimum value for a directory 1694 * hash key on-media is 0x0000000100000000, so we can use anything 1695 * less then that to represent our 'special' key space. 1696 */ 1697 error = 0; 1698 if (saveoff == 0) { 1699 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, "."); 1700 if (r) 1701 goto done; 1702 if (cookies) 1703 cookies[cookie_index] = saveoff; 1704 ++saveoff; 1705 ++cookie_index; 1706 if (cookie_index == ncookies) 1707 goto done; 1708 } 1709 if (saveoff == 1) { 1710 if (ip->ino_data.parent_obj_id) { 1711 r = vop_write_dirent(&error, uio, 1712 ip->ino_data.parent_obj_id, 1713 DT_DIR, 2, ".."); 1714 } else { 1715 r = vop_write_dirent(&error, uio, 1716 ip->obj_id, DT_DIR, 2, ".."); 1717 } 1718 if (r) 1719 goto done; 1720 if (cookies) 1721 cookies[cookie_index] = saveoff; 1722 ++saveoff; 1723 ++cookie_index; 1724 if (cookie_index == ncookies) 1725 goto done; 1726 } 1727 1728 /* 1729 * Key range (begin and end inclusive) to scan. Directory keys 1730 * directly translate to a 64 bit 'seek' position. 1731 */ 1732 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 1733 cursor.key_beg.localization = ip->obj_localization + 1734 hammer_dir_localization(ip); 1735 cursor.key_beg.obj_id = ip->obj_id; 1736 cursor.key_beg.create_tid = 0; 1737 cursor.key_beg.delete_tid = 0; 1738 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 1739 cursor.key_beg.obj_type = 0; 1740 cursor.key_beg.key = saveoff; 1741 1742 cursor.key_end = cursor.key_beg; 1743 cursor.key_end.key = HAMMER_MAX_KEY; 1744 cursor.asof = ip->obj_asof; 1745 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 1746 1747 error = hammer_ip_first(&cursor); 1748 1749 while (error == 0) { 1750 error = hammer_ip_resolve_data(&cursor); 1751 if (error) 1752 break; 1753 base = &cursor.leaf->base; 1754 saveoff = base->key; 1755 KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF); 1756 1757 if (base->obj_id != ip->obj_id) 1758 panic("readdir: bad record at %p", cursor.node); 1759 1760 /* 1761 * Convert pseudo-filesystems into softlinks 1762 */ 1763 dtype = hammer_get_dtype(cursor.leaf->base.obj_type); 1764 r = vop_write_dirent( 1765 &error, uio, cursor.data->entry.obj_id, 1766 dtype, 1767 cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF , 1768 (void *)cursor.data->entry.name); 1769 if (r) 1770 break; 1771 ++saveoff; 1772 if (cookies) 1773 cookies[cookie_index] = base->key; 1774 ++cookie_index; 1775 if (cookie_index == ncookies) 1776 break; 1777 error = hammer_ip_next(&cursor); 1778 } 1779 hammer_done_cursor(&cursor); 1780 1781 done: 1782 hammer_done_transaction(&trans); 1783 1784 if (ap->a_eofflag) 1785 *ap->a_eofflag = (error == ENOENT); 1786 uio->uio_offset = saveoff; 1787 if (error && cookie_index == 0) { 1788 if (error == ENOENT) 1789 error = 0; 1790 if (cookies) { 1791 kfree(cookies, M_TEMP); 1792 *ap->a_ncookies = 0; 1793 *ap->a_cookies = NULL; 1794 } 1795 } else { 1796 if (error == ENOENT) 1797 error = 0; 1798 if (cookies) { 1799 *ap->a_ncookies = cookie_index; 1800 *ap->a_cookies = cookies; 1801 } 1802 } 1803 lwkt_reltoken(&hmp->fs_token); 1804 return(error); 1805 } 1806 1807 /* 1808 * hammer_vop_readlink { vp, uio, cred } 1809 */ 1810 static 1811 int 1812 hammer_vop_readlink(struct vop_readlink_args *ap) 1813 { 1814 struct hammer_transaction trans; 1815 struct hammer_cursor cursor; 1816 struct hammer_inode *ip; 1817 hammer_mount_t hmp; 1818 char buf[32]; 1819 u_int32_t localization; 1820 hammer_pseudofs_inmem_t pfsm; 1821 int error; 1822 1823 ip = VTOI(ap->a_vp); 1824 hmp = ip->hmp; 1825 1826 lwkt_gettoken(&hmp->fs_token); 1827 1828 /* 1829 * Shortcut if the symlink data was stuffed into ino_data. 1830 * 1831 * Also expand special "@@PFS%05d" softlinks (expansion only 1832 * occurs for non-historical (current) accesses made from the 1833 * primary filesystem). 1834 */ 1835 if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) { 1836 char *ptr; 1837 int bytes; 1838 1839 ptr = ip->ino_data.ext.symlink; 1840 bytes = (int)ip->ino_data.size; 1841 if (bytes == 10 && 1842 ip->obj_asof == HAMMER_MAX_TID && 1843 ip->obj_localization == 0 && 1844 strncmp(ptr, "@@PFS", 5) == 0) { 1845 hammer_simple_transaction(&trans, hmp); 1846 bcopy(ptr + 5, buf, 5); 1847 buf[5] = 0; 1848 localization = strtoul(buf, NULL, 10) << 16; 1849 pfsm = hammer_load_pseudofs(&trans, localization, 1850 &error); 1851 if (error == 0) { 1852 if (pfsm->pfsd.mirror_flags & 1853 HAMMER_PFSD_SLAVE) { 1854 /* vap->va_size == 26 */ 1855 ksnprintf(buf, sizeof(buf), 1856 "@@0x%016llx:%05d", 1857 (long long)pfsm->pfsd.sync_end_tid, 1858 localization >> 16); 1859 } else { 1860 /* vap->va_size == 10 */ 1861 ksnprintf(buf, sizeof(buf), 1862 "@@-1:%05d", 1863 localization >> 16); 1864 #if 0 1865 ksnprintf(buf, sizeof(buf), 1866 "@@0x%016llx:%05d", 1867 (long long)HAMMER_MAX_TID, 1868 localization >> 16); 1869 #endif 1870 } 1871 ptr = buf; 1872 bytes = strlen(buf); 1873 } 1874 if (pfsm) 1875 hammer_rel_pseudofs(hmp, pfsm); 1876 hammer_done_transaction(&trans); 1877 } 1878 error = uiomove(ptr, bytes, ap->a_uio); 1879 lwkt_reltoken(&hmp->fs_token); 1880 return(error); 1881 } 1882 1883 /* 1884 * Long version 1885 */ 1886 hammer_simple_transaction(&trans, hmp); 1887 ++hammer_stats_file_iopsr; 1888 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 1889 1890 /* 1891 * Key range (begin and end inclusive) to scan. Directory keys 1892 * directly translate to a 64 bit 'seek' position. 1893 */ 1894 cursor.key_beg.localization = ip->obj_localization + 1895 HAMMER_LOCALIZE_MISC; 1896 cursor.key_beg.obj_id = ip->obj_id; 1897 cursor.key_beg.create_tid = 0; 1898 cursor.key_beg.delete_tid = 0; 1899 cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX; 1900 cursor.key_beg.obj_type = 0; 1901 cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK; 1902 cursor.asof = ip->obj_asof; 1903 cursor.flags |= HAMMER_CURSOR_ASOF; 1904 1905 error = hammer_ip_lookup(&cursor); 1906 if (error == 0) { 1907 error = hammer_ip_resolve_data(&cursor); 1908 if (error == 0) { 1909 KKASSERT(cursor.leaf->data_len >= 1910 HAMMER_SYMLINK_NAME_OFF); 1911 error = uiomove(cursor.data->symlink.name, 1912 cursor.leaf->data_len - 1913 HAMMER_SYMLINK_NAME_OFF, 1914 ap->a_uio); 1915 } 1916 } 1917 hammer_done_cursor(&cursor); 1918 hammer_done_transaction(&trans); 1919 lwkt_reltoken(&hmp->fs_token); 1920 return(error); 1921 } 1922 1923 /* 1924 * hammer_vop_nremove { nch, dvp, cred } 1925 */ 1926 static 1927 int 1928 hammer_vop_nremove(struct vop_nremove_args *ap) 1929 { 1930 struct hammer_transaction trans; 1931 struct hammer_inode *dip; 1932 hammer_mount_t hmp; 1933 int error; 1934 1935 dip = VTOI(ap->a_dvp); 1936 hmp = dip->hmp; 1937 1938 if (hammer_nohistory(dip) == 0 && 1939 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 1940 return (error); 1941 } 1942 1943 lwkt_gettoken(&hmp->fs_token); 1944 hammer_start_transaction(&trans, hmp); 1945 ++hammer_stats_file_iopsw; 1946 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 0); 1947 hammer_done_transaction(&trans); 1948 if (error == 0) 1949 hammer_knote(ap->a_dvp, NOTE_WRITE); 1950 lwkt_reltoken(&hmp->fs_token); 1951 return (error); 1952 } 1953 1954 /* 1955 * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred } 1956 */ 1957 static 1958 int 1959 hammer_vop_nrename(struct vop_nrename_args *ap) 1960 { 1961 struct hammer_transaction trans; 1962 struct namecache *fncp; 1963 struct namecache *tncp; 1964 struct hammer_inode *fdip; 1965 struct hammer_inode *tdip; 1966 struct hammer_inode *ip; 1967 hammer_mount_t hmp; 1968 struct hammer_cursor cursor; 1969 int64_t namekey; 1970 u_int32_t max_iterations; 1971 int nlen, error; 1972 1973 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount) 1974 return(EXDEV); 1975 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount) 1976 return(EXDEV); 1977 1978 fdip = VTOI(ap->a_fdvp); 1979 tdip = VTOI(ap->a_tdvp); 1980 fncp = ap->a_fnch->ncp; 1981 tncp = ap->a_tnch->ncp; 1982 ip = VTOI(fncp->nc_vp); 1983 KKASSERT(ip != NULL); 1984 1985 hmp = ip->hmp; 1986 1987 if (fdip->obj_localization != tdip->obj_localization) 1988 return(EXDEV); 1989 if (fdip->obj_localization != ip->obj_localization) 1990 return(EXDEV); 1991 1992 if (fdip->flags & HAMMER_INODE_RO) 1993 return (EROFS); 1994 if (tdip->flags & HAMMER_INODE_RO) 1995 return (EROFS); 1996 if (ip->flags & HAMMER_INODE_RO) 1997 return (EROFS); 1998 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 1999 return (error); 2000 2001 lwkt_gettoken(&hmp->fs_token); 2002 hammer_start_transaction(&trans, hmp); 2003 ++hammer_stats_file_iopsw; 2004 2005 /* 2006 * Remove tncp from the target directory and then link ip as 2007 * tncp. XXX pass trans to dounlink 2008 * 2009 * Force the inode sync-time to match the transaction so it is 2010 * in-sync with the creation of the target directory entry. 2011 */ 2012 error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp, 2013 ap->a_cred, 0, -1); 2014 if (error == 0 || error == ENOENT) { 2015 error = hammer_ip_add_directory(&trans, tdip, 2016 tncp->nc_name, tncp->nc_nlen, 2017 ip); 2018 if (error == 0) { 2019 ip->ino_data.parent_obj_id = tdip->obj_id; 2020 ip->ino_data.ctime = trans.time; 2021 hammer_modify_inode(&trans, ip, HAMMER_INODE_DDIRTY); 2022 } 2023 } 2024 if (error) 2025 goto failed; /* XXX */ 2026 2027 /* 2028 * Locate the record in the originating directory and remove it. 2029 * 2030 * Calculate the namekey and setup the key range for the scan. This 2031 * works kinda like a chained hash table where the lower 32 bits 2032 * of the namekey synthesize the chain. 2033 * 2034 * The key range is inclusive of both key_beg and key_end. 2035 */ 2036 namekey = hammer_directory_namekey(fdip, fncp->nc_name, fncp->nc_nlen, 2037 &max_iterations); 2038 retry: 2039 hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip); 2040 cursor.key_beg.localization = fdip->obj_localization + 2041 hammer_dir_localization(fdip); 2042 cursor.key_beg.obj_id = fdip->obj_id; 2043 cursor.key_beg.key = namekey; 2044 cursor.key_beg.create_tid = 0; 2045 cursor.key_beg.delete_tid = 0; 2046 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 2047 cursor.key_beg.obj_type = 0; 2048 2049 cursor.key_end = cursor.key_beg; 2050 cursor.key_end.key += max_iterations; 2051 cursor.asof = fdip->obj_asof; 2052 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 2053 2054 /* 2055 * Scan all matching records (the chain), locate the one matching 2056 * the requested path component. 2057 * 2058 * The hammer_ip_*() functions merge in-memory records with on-disk 2059 * records for the purposes of the search. 2060 */ 2061 error = hammer_ip_first(&cursor); 2062 while (error == 0) { 2063 if (hammer_ip_resolve_data(&cursor) != 0) 2064 break; 2065 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF; 2066 KKASSERT(nlen > 0); 2067 if (fncp->nc_nlen == nlen && 2068 bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) { 2069 break; 2070 } 2071 error = hammer_ip_next(&cursor); 2072 } 2073 2074 /* 2075 * If all is ok we have to get the inode so we can adjust nlinks. 2076 * 2077 * WARNING: hammer_ip_del_directory() may have to terminate the 2078 * cursor to avoid a recursion. It's ok to call hammer_done_cursor() 2079 * twice. 2080 */ 2081 if (error == 0) 2082 error = hammer_ip_del_directory(&trans, &cursor, fdip, ip); 2083 2084 /* 2085 * XXX A deadlock here will break rename's atomicy for the purposes 2086 * of crash recovery. 2087 */ 2088 if (error == EDEADLK) { 2089 hammer_done_cursor(&cursor); 2090 goto retry; 2091 } 2092 2093 /* 2094 * Cleanup and tell the kernel that the rename succeeded. 2095 * 2096 * NOTE: ip->vp, if non-NULL, cannot be directly referenced 2097 * without formally acquiring the vp since the vp might 2098 * have zero refs on it, or in the middle of a reclaim, 2099 * etc. 2100 */ 2101 hammer_done_cursor(&cursor); 2102 if (error == 0) { 2103 cache_rename(ap->a_fnch, ap->a_tnch); 2104 hammer_knote(ap->a_fdvp, NOTE_WRITE); 2105 hammer_knote(ap->a_tdvp, NOTE_WRITE); 2106 while (ip->vp) { 2107 struct vnode *vp; 2108 2109 error = hammer_get_vnode(ip, &vp); 2110 if (error == 0 && vp) { 2111 vn_unlock(vp); 2112 hammer_knote(ip->vp, NOTE_RENAME); 2113 vrele(vp); 2114 break; 2115 } 2116 kprintf("Debug: HAMMER ip/vp race2 avoided\n"); 2117 } 2118 } 2119 2120 failed: 2121 hammer_done_transaction(&trans); 2122 lwkt_reltoken(&hmp->fs_token); 2123 return (error); 2124 } 2125 2126 /* 2127 * hammer_vop_nrmdir { nch, dvp, cred } 2128 */ 2129 static 2130 int 2131 hammer_vop_nrmdir(struct vop_nrmdir_args *ap) 2132 { 2133 struct hammer_transaction trans; 2134 struct hammer_inode *dip; 2135 hammer_mount_t hmp; 2136 int error; 2137 2138 dip = VTOI(ap->a_dvp); 2139 hmp = dip->hmp; 2140 2141 if (hammer_nohistory(dip) == 0 && 2142 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 2143 return (error); 2144 } 2145 2146 lwkt_gettoken(&hmp->fs_token); 2147 hammer_start_transaction(&trans, hmp); 2148 ++hammer_stats_file_iopsw; 2149 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 1); 2150 hammer_done_transaction(&trans); 2151 if (error == 0) 2152 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 2153 lwkt_reltoken(&hmp->fs_token); 2154 return (error); 2155 } 2156 2157 /* 2158 * hammer_vop_markatime { vp, cred } 2159 */ 2160 static 2161 int 2162 hammer_vop_markatime(struct vop_markatime_args *ap) 2163 { 2164 struct hammer_transaction trans; 2165 struct hammer_inode *ip; 2166 hammer_mount_t hmp; 2167 2168 ip = VTOI(ap->a_vp); 2169 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 2170 return (EROFS); 2171 if (ip->flags & HAMMER_INODE_RO) 2172 return (EROFS); 2173 hmp = ip->hmp; 2174 if (hmp->mp->mnt_flag & MNT_NOATIME) 2175 return (0); 2176 lwkt_gettoken(&hmp->fs_token); 2177 hammer_start_transaction(&trans, hmp); 2178 ++hammer_stats_file_iopsw; 2179 2180 ip->ino_data.atime = trans.time; 2181 hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME); 2182 hammer_done_transaction(&trans); 2183 hammer_knote(ap->a_vp, NOTE_ATTRIB); 2184 lwkt_reltoken(&hmp->fs_token); 2185 return (0); 2186 } 2187 2188 /* 2189 * hammer_vop_setattr { vp, vap, cred } 2190 */ 2191 static 2192 int 2193 hammer_vop_setattr(struct vop_setattr_args *ap) 2194 { 2195 struct hammer_transaction trans; 2196 struct hammer_inode *ip; 2197 struct vattr *vap; 2198 hammer_mount_t hmp; 2199 int modflags; 2200 int error; 2201 int truncating; 2202 int blksize; 2203 int kflags; 2204 #if 0 2205 int64_t aligned_size; 2206 #endif 2207 u_int32_t flags; 2208 2209 vap = ap->a_vap; 2210 ip = ap->a_vp->v_data; 2211 modflags = 0; 2212 kflags = 0; 2213 hmp = ip->hmp; 2214 2215 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 2216 return(EROFS); 2217 if (ip->flags & HAMMER_INODE_RO) 2218 return (EROFS); 2219 if (hammer_nohistory(ip) == 0 && 2220 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 2221 return (error); 2222 } 2223 2224 lwkt_gettoken(&hmp->fs_token); 2225 hammer_start_transaction(&trans, hmp); 2226 ++hammer_stats_file_iopsw; 2227 error = 0; 2228 2229 if (vap->va_flags != VNOVAL) { 2230 flags = ip->ino_data.uflags; 2231 error = vop_helper_setattr_flags(&flags, vap->va_flags, 2232 hammer_to_unix_xid(&ip->ino_data.uid), 2233 ap->a_cred); 2234 if (error == 0) { 2235 if (ip->ino_data.uflags != flags) { 2236 ip->ino_data.uflags = flags; 2237 ip->ino_data.ctime = trans.time; 2238 modflags |= HAMMER_INODE_DDIRTY; 2239 kflags |= NOTE_ATTRIB; 2240 } 2241 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) { 2242 error = 0; 2243 goto done; 2244 } 2245 } 2246 goto done; 2247 } 2248 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) { 2249 error = EPERM; 2250 goto done; 2251 } 2252 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 2253 mode_t cur_mode = ip->ino_data.mode; 2254 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid); 2255 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid); 2256 uuid_t uuid_uid; 2257 uuid_t uuid_gid; 2258 2259 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid, 2260 ap->a_cred, 2261 &cur_uid, &cur_gid, &cur_mode); 2262 if (error == 0) { 2263 hammer_guid_to_uuid(&uuid_uid, cur_uid); 2264 hammer_guid_to_uuid(&uuid_gid, cur_gid); 2265 if (bcmp(&uuid_uid, &ip->ino_data.uid, 2266 sizeof(uuid_uid)) || 2267 bcmp(&uuid_gid, &ip->ino_data.gid, 2268 sizeof(uuid_gid)) || 2269 ip->ino_data.mode != cur_mode 2270 ) { 2271 ip->ino_data.uid = uuid_uid; 2272 ip->ino_data.gid = uuid_gid; 2273 ip->ino_data.mode = cur_mode; 2274 ip->ino_data.ctime = trans.time; 2275 modflags |= HAMMER_INODE_DDIRTY; 2276 } 2277 kflags |= NOTE_ATTRIB; 2278 } 2279 } 2280 while (vap->va_size != VNOVAL && ip->ino_data.size != vap->va_size) { 2281 switch(ap->a_vp->v_type) { 2282 case VREG: 2283 if (vap->va_size == ip->ino_data.size) 2284 break; 2285 2286 /* 2287 * Log the operation if in fast-fsync mode or if 2288 * there are unterminated redo write records present. 2289 * 2290 * The second check is needed so the recovery code 2291 * properly truncates write redos even if nominal 2292 * REDO operations is turned off due to excessive 2293 * writes, because the related records might be 2294 * destroyed and never lay down a TERM_WRITE. 2295 */ 2296 if ((ip->flags & HAMMER_INODE_REDO) || 2297 (ip->flags & HAMMER_INODE_RDIRTY)) { 2298 error = hammer_generate_redo(&trans, ip, 2299 vap->va_size, 2300 HAMMER_REDO_TRUNC, 2301 NULL, 0); 2302 } 2303 blksize = hammer_blocksize(vap->va_size); 2304 2305 /* 2306 * XXX break atomicy, we can deadlock the backend 2307 * if we do not release the lock. Probably not a 2308 * big deal here. 2309 */ 2310 if (vap->va_size < ip->ino_data.size) { 2311 nvtruncbuf(ap->a_vp, vap->va_size, 2312 blksize, 2313 hammer_blockoff(vap->va_size), 2314 0); 2315 truncating = 1; 2316 kflags |= NOTE_WRITE; 2317 } else { 2318 nvextendbuf(ap->a_vp, 2319 ip->ino_data.size, 2320 vap->va_size, 2321 hammer_blocksize(ip->ino_data.size), 2322 hammer_blocksize(vap->va_size), 2323 hammer_blockoff(ip->ino_data.size), 2324 hammer_blockoff(vap->va_size), 2325 0); 2326 truncating = 0; 2327 kflags |= NOTE_WRITE | NOTE_EXTEND; 2328 } 2329 ip->ino_data.size = vap->va_size; 2330 ip->ino_data.mtime = trans.time; 2331 /* XXX safe to use SDIRTY instead of DDIRTY here? */ 2332 modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY; 2333 2334 /* 2335 * On-media truncation is cached in the inode until 2336 * the inode is synchronized. We must immediately 2337 * handle any frontend records. 2338 */ 2339 if (truncating) { 2340 hammer_ip_frontend_trunc(ip, vap->va_size); 2341 #ifdef DEBUG_TRUNCATE 2342 if (HammerTruncIp == NULL) 2343 HammerTruncIp = ip; 2344 #endif 2345 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) { 2346 ip->flags |= HAMMER_INODE_TRUNCATED; 2347 ip->trunc_off = vap->va_size; 2348 #ifdef DEBUG_TRUNCATE 2349 if (ip == HammerTruncIp) 2350 kprintf("truncate1 %016llx\n", 2351 (long long)ip->trunc_off); 2352 #endif 2353 } else if (ip->trunc_off > vap->va_size) { 2354 ip->trunc_off = vap->va_size; 2355 #ifdef DEBUG_TRUNCATE 2356 if (ip == HammerTruncIp) 2357 kprintf("truncate2 %016llx\n", 2358 (long long)ip->trunc_off); 2359 #endif 2360 } else { 2361 #ifdef DEBUG_TRUNCATE 2362 if (ip == HammerTruncIp) 2363 kprintf("truncate3 %016llx (ignored)\n", 2364 (long long)vap->va_size); 2365 #endif 2366 } 2367 } 2368 2369 #if 0 2370 /* 2371 * When truncating, nvtruncbuf() may have cleaned out 2372 * a portion of the last block on-disk in the buffer 2373 * cache. We must clean out any frontend records 2374 * for blocks beyond the new last block. 2375 */ 2376 aligned_size = (vap->va_size + (blksize - 1)) & 2377 ~(int64_t)(blksize - 1); 2378 if (truncating && vap->va_size < aligned_size) { 2379 aligned_size -= blksize; 2380 hammer_ip_frontend_trunc(ip, aligned_size); 2381 } 2382 #endif 2383 break; 2384 case VDATABASE: 2385 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) { 2386 ip->flags |= HAMMER_INODE_TRUNCATED; 2387 ip->trunc_off = vap->va_size; 2388 } else if (ip->trunc_off > vap->va_size) { 2389 ip->trunc_off = vap->va_size; 2390 } 2391 hammer_ip_frontend_trunc(ip, vap->va_size); 2392 ip->ino_data.size = vap->va_size; 2393 ip->ino_data.mtime = trans.time; 2394 modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY; 2395 kflags |= NOTE_ATTRIB; 2396 break; 2397 default: 2398 error = EINVAL; 2399 goto done; 2400 } 2401 break; 2402 } 2403 if (vap->va_atime.tv_sec != VNOVAL) { 2404 ip->ino_data.atime = hammer_timespec_to_time(&vap->va_atime); 2405 modflags |= HAMMER_INODE_ATIME; 2406 kflags |= NOTE_ATTRIB; 2407 } 2408 if (vap->va_mtime.tv_sec != VNOVAL) { 2409 ip->ino_data.mtime = hammer_timespec_to_time(&vap->va_mtime); 2410 modflags |= HAMMER_INODE_MTIME; 2411 kflags |= NOTE_ATTRIB; 2412 } 2413 if (vap->va_mode != (mode_t)VNOVAL) { 2414 mode_t cur_mode = ip->ino_data.mode; 2415 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid); 2416 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid); 2417 2418 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred, 2419 cur_uid, cur_gid, &cur_mode); 2420 if (error == 0 && ip->ino_data.mode != cur_mode) { 2421 ip->ino_data.mode = cur_mode; 2422 ip->ino_data.ctime = trans.time; 2423 modflags |= HAMMER_INODE_DDIRTY; 2424 kflags |= NOTE_ATTRIB; 2425 } 2426 } 2427 done: 2428 if (error == 0) 2429 hammer_modify_inode(&trans, ip, modflags); 2430 hammer_done_transaction(&trans); 2431 hammer_knote(ap->a_vp, kflags); 2432 lwkt_reltoken(&hmp->fs_token); 2433 return (error); 2434 } 2435 2436 /* 2437 * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target } 2438 */ 2439 static 2440 int 2441 hammer_vop_nsymlink(struct vop_nsymlink_args *ap) 2442 { 2443 struct hammer_transaction trans; 2444 struct hammer_inode *dip; 2445 struct hammer_inode *nip; 2446 hammer_record_t record; 2447 struct nchandle *nch; 2448 hammer_mount_t hmp; 2449 int error; 2450 int bytes; 2451 2452 ap->a_vap->va_type = VLNK; 2453 2454 nch = ap->a_nch; 2455 dip = VTOI(ap->a_dvp); 2456 hmp = dip->hmp; 2457 2458 if (dip->flags & HAMMER_INODE_RO) 2459 return (EROFS); 2460 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) 2461 return (error); 2462 2463 /* 2464 * Create a transaction to cover the operations we perform. 2465 */ 2466 lwkt_gettoken(&hmp->fs_token); 2467 hammer_start_transaction(&trans, hmp); 2468 ++hammer_stats_file_iopsw; 2469 2470 /* 2471 * Create a new filesystem object of the requested type. The 2472 * returned inode will be referenced but not locked. 2473 */ 2474 2475 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 2476 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 2477 NULL, &nip); 2478 if (error) { 2479 hammer_done_transaction(&trans); 2480 *ap->a_vpp = NULL; 2481 lwkt_reltoken(&hmp->fs_token); 2482 return (error); 2483 } 2484 2485 /* 2486 * Add a record representing the symlink. symlink stores the link 2487 * as pure data, not a string, and is no \0 terminated. 2488 */ 2489 if (error == 0) { 2490 bytes = strlen(ap->a_target); 2491 2492 if (bytes <= HAMMER_INODE_BASESYMLEN) { 2493 bcopy(ap->a_target, nip->ino_data.ext.symlink, bytes); 2494 } else { 2495 record = hammer_alloc_mem_record(nip, bytes); 2496 record->type = HAMMER_MEM_RECORD_GENERAL; 2497 2498 record->leaf.base.localization = nip->obj_localization + 2499 HAMMER_LOCALIZE_MISC; 2500 record->leaf.base.key = HAMMER_FIXKEY_SYMLINK; 2501 record->leaf.base.rec_type = HAMMER_RECTYPE_FIX; 2502 record->leaf.data_len = bytes; 2503 KKASSERT(HAMMER_SYMLINK_NAME_OFF == 0); 2504 bcopy(ap->a_target, record->data->symlink.name, bytes); 2505 error = hammer_ip_add_record(&trans, record); 2506 } 2507 2508 /* 2509 * Set the file size to the length of the link. 2510 */ 2511 if (error == 0) { 2512 nip->ino_data.size = bytes; 2513 hammer_modify_inode(&trans, nip, HAMMER_INODE_DDIRTY); 2514 } 2515 } 2516 if (error == 0) 2517 error = hammer_ip_add_directory(&trans, dip, nch->ncp->nc_name, 2518 nch->ncp->nc_nlen, nip); 2519 2520 /* 2521 * Finish up. 2522 */ 2523 if (error) { 2524 hammer_rel_inode(nip, 0); 2525 *ap->a_vpp = NULL; 2526 } else { 2527 error = hammer_get_vnode(nip, ap->a_vpp); 2528 hammer_rel_inode(nip, 0); 2529 if (error == 0) { 2530 cache_setunresolved(ap->a_nch); 2531 cache_setvp(ap->a_nch, *ap->a_vpp); 2532 hammer_knote(ap->a_dvp, NOTE_WRITE); 2533 } 2534 } 2535 hammer_done_transaction(&trans); 2536 lwkt_reltoken(&hmp->fs_token); 2537 return (error); 2538 } 2539 2540 /* 2541 * hammer_vop_nwhiteout { nch, dvp, cred, flags } 2542 */ 2543 static 2544 int 2545 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap) 2546 { 2547 struct hammer_transaction trans; 2548 struct hammer_inode *dip; 2549 hammer_mount_t hmp; 2550 int error; 2551 2552 dip = VTOI(ap->a_dvp); 2553 hmp = dip->hmp; 2554 2555 if (hammer_nohistory(dip) == 0 && 2556 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) { 2557 return (error); 2558 } 2559 2560 lwkt_gettoken(&hmp->fs_token); 2561 hammer_start_transaction(&trans, hmp); 2562 ++hammer_stats_file_iopsw; 2563 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, 2564 ap->a_cred, ap->a_flags, -1); 2565 hammer_done_transaction(&trans); 2566 lwkt_reltoken(&hmp->fs_token); 2567 2568 return (error); 2569 } 2570 2571 /* 2572 * hammer_vop_ioctl { vp, command, data, fflag, cred } 2573 */ 2574 static 2575 int 2576 hammer_vop_ioctl(struct vop_ioctl_args *ap) 2577 { 2578 struct hammer_inode *ip = ap->a_vp->v_data; 2579 hammer_mount_t hmp = ip->hmp; 2580 int error; 2581 2582 ++hammer_stats_file_iopsr; 2583 lwkt_gettoken(&hmp->fs_token); 2584 error = hammer_ioctl(ip, ap->a_command, ap->a_data, 2585 ap->a_fflag, ap->a_cred); 2586 lwkt_reltoken(&hmp->fs_token); 2587 return (error); 2588 } 2589 2590 static 2591 int 2592 hammer_vop_mountctl(struct vop_mountctl_args *ap) 2593 { 2594 static const struct mountctl_opt extraopt[] = { 2595 { HMNT_NOHISTORY, "nohistory" }, 2596 { HMNT_MASTERID, "master" }, 2597 { 0, NULL} 2598 2599 }; 2600 struct hammer_mount *hmp; 2601 struct mount *mp; 2602 int usedbytes; 2603 int error; 2604 2605 error = 0; 2606 usedbytes = 0; 2607 mp = ap->a_head.a_ops->head.vv_mount; 2608 KKASSERT(mp->mnt_data != NULL); 2609 hmp = (struct hammer_mount *)mp->mnt_data; 2610 2611 lwkt_gettoken(&hmp->fs_token); 2612 2613 switch(ap->a_op) { 2614 case MOUNTCTL_SET_EXPORT: 2615 if (ap->a_ctllen != sizeof(struct export_args)) 2616 error = EINVAL; 2617 else 2618 error = hammer_vfs_export(mp, ap->a_op, 2619 (const struct export_args *)ap->a_ctl); 2620 break; 2621 case MOUNTCTL_MOUNTFLAGS: 2622 { 2623 /* 2624 * Call standard mountctl VOP function 2625 * so we get user mount flags. 2626 */ 2627 error = vop_stdmountctl(ap); 2628 if (error) 2629 break; 2630 2631 usedbytes = *ap->a_res; 2632 2633 if (usedbytes > 0 && usedbytes < ap->a_buflen) { 2634 usedbytes += vfs_flagstostr(hmp->hflags, extraopt, 2635 ap->a_buf, 2636 ap->a_buflen - usedbytes, 2637 &error); 2638 } 2639 2640 *ap->a_res += usedbytes; 2641 break; 2642 } 2643 default: 2644 error = vop_stdmountctl(ap); 2645 break; 2646 } 2647 lwkt_reltoken(&hmp->fs_token); 2648 return(error); 2649 } 2650 2651 /* 2652 * hammer_vop_strategy { vp, bio } 2653 * 2654 * Strategy call, used for regular file read & write only. Note that the 2655 * bp may represent a cluster. 2656 * 2657 * To simplify operation and allow better optimizations in the future, 2658 * this code does not make any assumptions with regards to buffer alignment 2659 * or size. 2660 */ 2661 static 2662 int 2663 hammer_vop_strategy(struct vop_strategy_args *ap) 2664 { 2665 struct buf *bp; 2666 int error; 2667 2668 bp = ap->a_bio->bio_buf; 2669 2670 switch(bp->b_cmd) { 2671 case BUF_CMD_READ: 2672 error = hammer_vop_strategy_read(ap); 2673 break; 2674 case BUF_CMD_WRITE: 2675 error = hammer_vop_strategy_write(ap); 2676 break; 2677 default: 2678 bp->b_error = error = EINVAL; 2679 bp->b_flags |= B_ERROR; 2680 biodone(ap->a_bio); 2681 break; 2682 } 2683 2684 /* hammer_dump_dedup_cache(((hammer_inode_t)ap->a_vp->v_data)->hmp); */ 2685 2686 return (error); 2687 } 2688 2689 /* 2690 * Read from a regular file. Iterate the related records and fill in the 2691 * BIO/BUF. Gaps are zero-filled. 2692 * 2693 * The support code in hammer_object.c should be used to deal with mixed 2694 * in-memory and on-disk records. 2695 * 2696 * NOTE: Can be called from the cluster code with an oversized buf. 2697 * 2698 * XXX atime update 2699 */ 2700 static 2701 int 2702 hammer_vop_strategy_read(struct vop_strategy_args *ap) 2703 { 2704 struct hammer_transaction trans; 2705 struct hammer_inode *ip; 2706 struct hammer_inode *dip; 2707 hammer_mount_t hmp; 2708 struct hammer_cursor cursor; 2709 hammer_base_elm_t base; 2710 hammer_off_t disk_offset; 2711 struct bio *bio; 2712 struct bio *nbio; 2713 struct buf *bp; 2714 int64_t rec_offset; 2715 int64_t ran_end; 2716 int64_t tmp64; 2717 int error; 2718 int boff; 2719 int roff; 2720 int n; 2721 int isdedupable; 2722 2723 bio = ap->a_bio; 2724 bp = bio->bio_buf; 2725 ip = ap->a_vp->v_data; 2726 hmp = ip->hmp; 2727 2728 /* 2729 * The zone-2 disk offset may have been set by the cluster code via 2730 * a BMAP operation, or else should be NOOFFSET. 2731 * 2732 * Checking the high bits for a match against zone-2 should suffice. 2733 * 2734 * In cases where a lot of data duplication is present it may be 2735 * more beneficial to drop through and doubule-buffer through the 2736 * device. 2737 */ 2738 nbio = push_bio(bio); 2739 if ((nbio->bio_offset & HAMMER_OFF_ZONE_MASK) == 2740 HAMMER_ZONE_LARGE_DATA) { 2741 if (hammer_double_buffer == 0) { 2742 lwkt_gettoken(&hmp->fs_token); 2743 error = hammer_io_direct_read(hmp, nbio, NULL); 2744 lwkt_reltoken(&hmp->fs_token); 2745 return (error); 2746 } 2747 2748 /* 2749 * Try to shortcut requests for double_buffer mode too. 2750 * Since this mode runs through the device buffer cache 2751 * only compatible buffer sizes (meaning those generated 2752 * by normal filesystem buffers) are legal. 2753 */ 2754 if (hammer_live_dedup == 0 && (bp->b_flags & B_PAGING) == 0) { 2755 error = hammer_io_indirect_read(hmp, nbio, NULL); 2756 return (error); 2757 } 2758 } 2759 2760 /* 2761 * Well, that sucked. Do it the hard way. If all the stars are 2762 * aligned we may still be able to issue a direct-read. 2763 */ 2764 lwkt_gettoken(&hmp->fs_token); 2765 hammer_simple_transaction(&trans, hmp); 2766 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 2767 2768 /* 2769 * Key range (begin and end inclusive) to scan. Note that the key's 2770 * stored in the actual records represent BASE+LEN, not BASE. The 2771 * first record containing bio_offset will have a key > bio_offset. 2772 */ 2773 cursor.key_beg.localization = ip->obj_localization + 2774 HAMMER_LOCALIZE_MISC; 2775 cursor.key_beg.obj_id = ip->obj_id; 2776 cursor.key_beg.create_tid = 0; 2777 cursor.key_beg.delete_tid = 0; 2778 cursor.key_beg.obj_type = 0; 2779 cursor.key_beg.key = bio->bio_offset + 1; 2780 cursor.asof = ip->obj_asof; 2781 cursor.flags |= HAMMER_CURSOR_ASOF; 2782 2783 cursor.key_end = cursor.key_beg; 2784 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE); 2785 #if 0 2786 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) { 2787 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB; 2788 cursor.key_end.rec_type = HAMMER_RECTYPE_DB; 2789 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL; 2790 } else 2791 #endif 2792 { 2793 ran_end = bio->bio_offset + bp->b_bufsize; 2794 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA; 2795 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA; 2796 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */ 2797 if (tmp64 < ran_end) 2798 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL; 2799 else 2800 cursor.key_end.key = ran_end + MAXPHYS + 1; 2801 } 2802 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE; 2803 2804 /* 2805 * Set NOSWAPCACHE for cursor data extraction if double buffering 2806 * is disabled or (if the file is not marked cacheable via chflags 2807 * and vm.swapcache_use_chflags is enabled). 2808 */ 2809 if (hammer_double_buffer == 0 || 2810 ((ap->a_vp->v_flag & VSWAPCACHE) == 0 && 2811 vm_swapcache_use_chflags)) { 2812 cursor.flags |= HAMMER_CURSOR_NOSWAPCACHE; 2813 } 2814 2815 error = hammer_ip_first(&cursor); 2816 boff = 0; 2817 2818 while (error == 0) { 2819 /* 2820 * Get the base file offset of the record. The key for 2821 * data records is (base + bytes) rather then (base). 2822 */ 2823 base = &cursor.leaf->base; 2824 rec_offset = base->key - cursor.leaf->data_len; 2825 2826 /* 2827 * Calculate the gap, if any, and zero-fill it. 2828 * 2829 * n is the offset of the start of the record verses our 2830 * current seek offset in the bio. 2831 */ 2832 n = (int)(rec_offset - (bio->bio_offset + boff)); 2833 if (n > 0) { 2834 if (n > bp->b_bufsize - boff) 2835 n = bp->b_bufsize - boff; 2836 bzero((char *)bp->b_data + boff, n); 2837 boff += n; 2838 n = 0; 2839 } 2840 2841 /* 2842 * Calculate the data offset in the record and the number 2843 * of bytes we can copy. 2844 * 2845 * There are two degenerate cases. First, boff may already 2846 * be at bp->b_bufsize. Secondly, the data offset within 2847 * the record may exceed the record's size. 2848 */ 2849 roff = -n; 2850 rec_offset += roff; 2851 n = cursor.leaf->data_len - roff; 2852 if (n <= 0) { 2853 kprintf("strategy_read: bad n=%d roff=%d\n", n, roff); 2854 n = 0; 2855 } else if (n > bp->b_bufsize - boff) { 2856 n = bp->b_bufsize - boff; 2857 } 2858 2859 /* 2860 * Deal with cached truncations. This cool bit of code 2861 * allows truncate()/ftruncate() to avoid having to sync 2862 * the file. 2863 * 2864 * If the frontend is truncated then all backend records are 2865 * subject to the frontend's truncation. 2866 * 2867 * If the backend is truncated then backend records on-disk 2868 * (but not in-memory) are subject to the backend's 2869 * truncation. In-memory records owned by the backend 2870 * represent data written after the truncation point on the 2871 * backend and must not be truncated. 2872 * 2873 * Truncate operations deal with frontend buffer cache 2874 * buffers and frontend-owned in-memory records synchronously. 2875 */ 2876 if (ip->flags & HAMMER_INODE_TRUNCATED) { 2877 if (hammer_cursor_ondisk(&cursor)/* || 2878 cursor.iprec->flush_state == HAMMER_FST_FLUSH*/) { 2879 if (ip->trunc_off <= rec_offset) 2880 n = 0; 2881 else if (ip->trunc_off < rec_offset + n) 2882 n = (int)(ip->trunc_off - rec_offset); 2883 } 2884 } 2885 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 2886 if (hammer_cursor_ondisk(&cursor)) { 2887 if (ip->sync_trunc_off <= rec_offset) 2888 n = 0; 2889 else if (ip->sync_trunc_off < rec_offset + n) 2890 n = (int)(ip->sync_trunc_off - rec_offset); 2891 } 2892 } 2893 2894 /* 2895 * Try to issue a direct read into our bio if possible, 2896 * otherwise resolve the element data into a hammer_buffer 2897 * and copy. 2898 * 2899 * The buffer on-disk should be zerod past any real 2900 * truncation point, but may not be for any synthesized 2901 * truncation point from above. 2902 * 2903 * NOTE: disk_offset is only valid if the cursor data is 2904 * on-disk. 2905 */ 2906 disk_offset = cursor.leaf->data_offset + roff; 2907 isdedupable = (boff == 0 && n == bp->b_bufsize && 2908 hammer_cursor_ondisk(&cursor) && 2909 ((int)disk_offset & HAMMER_BUFMASK) == 0); 2910 2911 if (isdedupable && hammer_double_buffer == 0) { 2912 /* 2913 * Direct read case 2914 */ 2915 KKASSERT((disk_offset & HAMMER_OFF_ZONE_MASK) == 2916 HAMMER_ZONE_LARGE_DATA); 2917 nbio->bio_offset = disk_offset; 2918 error = hammer_io_direct_read(hmp, nbio, cursor.leaf); 2919 if (hammer_live_dedup && error == 0) 2920 hammer_dedup_cache_add(ip, cursor.leaf); 2921 goto done; 2922 } else if (isdedupable) { 2923 /* 2924 * Async I/O case for reading from backing store 2925 * and copying the data to the filesystem buffer. 2926 * live-dedup has to verify the data anyway if it 2927 * gets a hit later so we can just add the entry 2928 * now. 2929 */ 2930 KKASSERT((disk_offset & HAMMER_OFF_ZONE_MASK) == 2931 HAMMER_ZONE_LARGE_DATA); 2932 nbio->bio_offset = disk_offset; 2933 if (hammer_live_dedup) 2934 hammer_dedup_cache_add(ip, cursor.leaf); 2935 error = hammer_io_indirect_read(hmp, nbio, cursor.leaf); 2936 goto done; 2937 } else if (n) { 2938 error = hammer_ip_resolve_data(&cursor); 2939 if (error == 0) { 2940 if (hammer_live_dedup && isdedupable) 2941 hammer_dedup_cache_add(ip, cursor.leaf); 2942 bcopy((char *)cursor.data + roff, 2943 (char *)bp->b_data + boff, n); 2944 } 2945 } 2946 if (error) 2947 break; 2948 2949 /* 2950 * We have to be sure that the only elements added to the 2951 * dedup cache are those which are already on-media. 2952 */ 2953 if (hammer_live_dedup && hammer_cursor_ondisk(&cursor)) 2954 hammer_dedup_cache_add(ip, cursor.leaf); 2955 2956 /* 2957 * Iterate until we have filled the request. 2958 */ 2959 boff += n; 2960 if (boff == bp->b_bufsize) 2961 break; 2962 error = hammer_ip_next(&cursor); 2963 } 2964 2965 /* 2966 * There may have been a gap after the last record 2967 */ 2968 if (error == ENOENT) 2969 error = 0; 2970 if (error == 0 && boff != bp->b_bufsize) { 2971 KKASSERT(boff < bp->b_bufsize); 2972 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff); 2973 /* boff = bp->b_bufsize; */ 2974 } 2975 2976 /* 2977 * Disallow swapcache operation on the vnode buffer if double 2978 * buffering is enabled, the swapcache will get the data via 2979 * the block device buffer. 2980 */ 2981 if (hammer_double_buffer) 2982 bp->b_flags |= B_NOTMETA; 2983 2984 /* 2985 * Cleanup 2986 */ 2987 bp->b_resid = 0; 2988 bp->b_error = error; 2989 if (error) 2990 bp->b_flags |= B_ERROR; 2991 biodone(ap->a_bio); 2992 2993 done: 2994 /* 2995 * Cache the b-tree node for the last data read in cache[1]. 2996 * 2997 * If we hit the file EOF then also cache the node in the 2998 * governing director's cache[3], it will be used to initialize 2999 * the inode's cache[1] for any inodes looked up via the directory. 3000 * 3001 * This doesn't reduce disk accesses since the B-Tree chain is 3002 * likely cached, but it does reduce cpu overhead when looking 3003 * up file offsets for cpdup/tar/cpio style iterations. 3004 */ 3005 if (cursor.node) 3006 hammer_cache_node(&ip->cache[1], cursor.node); 3007 if (ran_end >= ip->ino_data.size) { 3008 dip = hammer_find_inode(&trans, ip->ino_data.parent_obj_id, 3009 ip->obj_asof, ip->obj_localization); 3010 if (dip) { 3011 hammer_cache_node(&dip->cache[3], cursor.node); 3012 hammer_rel_inode(dip, 0); 3013 } 3014 } 3015 hammer_done_cursor(&cursor); 3016 hammer_done_transaction(&trans); 3017 lwkt_reltoken(&hmp->fs_token); 3018 return(error); 3019 } 3020 3021 /* 3022 * BMAP operation - used to support cluster_read() only. 3023 * 3024 * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb) 3025 * 3026 * This routine may return EOPNOTSUPP if the opration is not supported for 3027 * the specified offset. The contents of the pointer arguments do not 3028 * need to be initialized in that case. 3029 * 3030 * If a disk address is available and properly aligned return 0 with 3031 * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately 3032 * to the run-length relative to that offset. Callers may assume that 3033 * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently 3034 * large, so return EOPNOTSUPP if it is not sufficiently large. 3035 */ 3036 static 3037 int 3038 hammer_vop_bmap(struct vop_bmap_args *ap) 3039 { 3040 struct hammer_transaction trans; 3041 struct hammer_inode *ip; 3042 hammer_mount_t hmp; 3043 struct hammer_cursor cursor; 3044 hammer_base_elm_t base; 3045 int64_t rec_offset; 3046 int64_t ran_end; 3047 int64_t tmp64; 3048 int64_t base_offset; 3049 int64_t base_disk_offset; 3050 int64_t last_offset; 3051 hammer_off_t last_disk_offset; 3052 hammer_off_t disk_offset; 3053 int rec_len; 3054 int error; 3055 int blksize; 3056 3057 ++hammer_stats_file_iopsr; 3058 ip = ap->a_vp->v_data; 3059 hmp = ip->hmp; 3060 3061 /* 3062 * We can only BMAP regular files. We can't BMAP database files, 3063 * directories, etc. 3064 */ 3065 if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE) 3066 return(EOPNOTSUPP); 3067 3068 /* 3069 * bmap is typically called with runp/runb both NULL when used 3070 * for writing. We do not support BMAP for writing atm. 3071 */ 3072 if (ap->a_cmd != BUF_CMD_READ) 3073 return(EOPNOTSUPP); 3074 3075 /* 3076 * Scan the B-Tree to acquire blockmap addresses, then translate 3077 * to raw addresses. 3078 */ 3079 lwkt_gettoken(&hmp->fs_token); 3080 hammer_simple_transaction(&trans, hmp); 3081 #if 0 3082 kprintf("bmap_beg %016llx ip->cache %p\n", 3083 (long long)ap->a_loffset, ip->cache[1]); 3084 #endif 3085 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 3086 3087 /* 3088 * Key range (begin and end inclusive) to scan. Note that the key's 3089 * stored in the actual records represent BASE+LEN, not BASE. The 3090 * first record containing bio_offset will have a key > bio_offset. 3091 */ 3092 cursor.key_beg.localization = ip->obj_localization + 3093 HAMMER_LOCALIZE_MISC; 3094 cursor.key_beg.obj_id = ip->obj_id; 3095 cursor.key_beg.create_tid = 0; 3096 cursor.key_beg.delete_tid = 0; 3097 cursor.key_beg.obj_type = 0; 3098 if (ap->a_runb) 3099 cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1; 3100 else 3101 cursor.key_beg.key = ap->a_loffset + 1; 3102 if (cursor.key_beg.key < 0) 3103 cursor.key_beg.key = 0; 3104 cursor.asof = ip->obj_asof; 3105 cursor.flags |= HAMMER_CURSOR_ASOF; 3106 3107 cursor.key_end = cursor.key_beg; 3108 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE); 3109 3110 ran_end = ap->a_loffset + MAXPHYS; 3111 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA; 3112 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA; 3113 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */ 3114 if (tmp64 < ran_end) 3115 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL; 3116 else 3117 cursor.key_end.key = ran_end + MAXPHYS + 1; 3118 3119 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE; 3120 3121 error = hammer_ip_first(&cursor); 3122 base_offset = last_offset = 0; 3123 base_disk_offset = last_disk_offset = 0; 3124 3125 while (error == 0) { 3126 /* 3127 * Get the base file offset of the record. The key for 3128 * data records is (base + bytes) rather then (base). 3129 * 3130 * NOTE: rec_offset + rec_len may exceed the end-of-file. 3131 * The extra bytes should be zero on-disk and the BMAP op 3132 * should still be ok. 3133 */ 3134 base = &cursor.leaf->base; 3135 rec_offset = base->key - cursor.leaf->data_len; 3136 rec_len = cursor.leaf->data_len; 3137 3138 /* 3139 * Incorporate any cached truncation. 3140 * 3141 * NOTE: Modifications to rec_len based on synthesized 3142 * truncation points remove the guarantee that any extended 3143 * data on disk is zero (since the truncations may not have 3144 * taken place on-media yet). 3145 */ 3146 if (ip->flags & HAMMER_INODE_TRUNCATED) { 3147 if (hammer_cursor_ondisk(&cursor) || 3148 cursor.iprec->flush_state == HAMMER_FST_FLUSH) { 3149 if (ip->trunc_off <= rec_offset) 3150 rec_len = 0; 3151 else if (ip->trunc_off < rec_offset + rec_len) 3152 rec_len = (int)(ip->trunc_off - rec_offset); 3153 } 3154 } 3155 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 3156 if (hammer_cursor_ondisk(&cursor)) { 3157 if (ip->sync_trunc_off <= rec_offset) 3158 rec_len = 0; 3159 else if (ip->sync_trunc_off < rec_offset + rec_len) 3160 rec_len = (int)(ip->sync_trunc_off - rec_offset); 3161 } 3162 } 3163 3164 /* 3165 * Accumulate information. If we have hit a discontiguous 3166 * block reset base_offset unless we are already beyond the 3167 * requested offset. If we are, that's it, we stop. 3168 */ 3169 if (error) 3170 break; 3171 if (hammer_cursor_ondisk(&cursor)) { 3172 disk_offset = cursor.leaf->data_offset; 3173 if (rec_offset != last_offset || 3174 disk_offset != last_disk_offset) { 3175 if (rec_offset > ap->a_loffset) 3176 break; 3177 base_offset = rec_offset; 3178 base_disk_offset = disk_offset; 3179 } 3180 last_offset = rec_offset + rec_len; 3181 last_disk_offset = disk_offset + rec_len; 3182 3183 if (hammer_live_dedup) 3184 hammer_dedup_cache_add(ip, cursor.leaf); 3185 } 3186 3187 error = hammer_ip_next(&cursor); 3188 } 3189 3190 #if 0 3191 kprintf("BMAP %016llx: %016llx - %016llx\n", 3192 (long long)ap->a_loffset, 3193 (long long)base_offset, 3194 (long long)last_offset); 3195 kprintf("BMAP %16s: %016llx - %016llx\n", "", 3196 (long long)base_disk_offset, 3197 (long long)last_disk_offset); 3198 #endif 3199 3200 if (cursor.node) { 3201 hammer_cache_node(&ip->cache[1], cursor.node); 3202 #if 0 3203 kprintf("bmap_end2 %016llx ip->cache %p\n", 3204 (long long)ap->a_loffset, ip->cache[1]); 3205 #endif 3206 } 3207 hammer_done_cursor(&cursor); 3208 hammer_done_transaction(&trans); 3209 lwkt_reltoken(&hmp->fs_token); 3210 3211 /* 3212 * If we couldn't find any records or the records we did find were 3213 * all behind the requested offset, return failure. A forward 3214 * truncation can leave a hole w/ no on-disk records. 3215 */ 3216 if (last_offset == 0 || last_offset < ap->a_loffset) 3217 return (EOPNOTSUPP); 3218 3219 /* 3220 * Figure out the block size at the requested offset and adjust 3221 * our limits so the cluster_read() does not create inappropriately 3222 * sized buffer cache buffers. 3223 */ 3224 blksize = hammer_blocksize(ap->a_loffset); 3225 if (hammer_blocksize(base_offset) != blksize) { 3226 base_offset = hammer_blockdemarc(base_offset, ap->a_loffset); 3227 } 3228 if (last_offset != ap->a_loffset && 3229 hammer_blocksize(last_offset - 1) != blksize) { 3230 last_offset = hammer_blockdemarc(ap->a_loffset, 3231 last_offset - 1); 3232 } 3233 3234 /* 3235 * Returning EOPNOTSUPP simply prevents the direct-IO optimization 3236 * from occuring. 3237 */ 3238 disk_offset = base_disk_offset + (ap->a_loffset - base_offset); 3239 3240 if ((disk_offset & HAMMER_OFF_ZONE_MASK) != HAMMER_ZONE_LARGE_DATA) { 3241 /* 3242 * Only large-data zones can be direct-IOd 3243 */ 3244 error = EOPNOTSUPP; 3245 } else if ((disk_offset & HAMMER_BUFMASK) || 3246 (last_offset - ap->a_loffset) < blksize) { 3247 /* 3248 * doffsetp is not aligned or the forward run size does 3249 * not cover a whole buffer, disallow the direct I/O. 3250 */ 3251 error = EOPNOTSUPP; 3252 } else { 3253 /* 3254 * We're good. 3255 */ 3256 *ap->a_doffsetp = disk_offset; 3257 if (ap->a_runb) { 3258 *ap->a_runb = ap->a_loffset - base_offset; 3259 KKASSERT(*ap->a_runb >= 0); 3260 } 3261 if (ap->a_runp) { 3262 *ap->a_runp = last_offset - ap->a_loffset; 3263 KKASSERT(*ap->a_runp >= 0); 3264 } 3265 error = 0; 3266 } 3267 return(error); 3268 } 3269 3270 /* 3271 * Write to a regular file. Because this is a strategy call the OS is 3272 * trying to actually get data onto the media. 3273 */ 3274 static 3275 int 3276 hammer_vop_strategy_write(struct vop_strategy_args *ap) 3277 { 3278 hammer_record_t record; 3279 hammer_mount_t hmp; 3280 hammer_inode_t ip; 3281 struct bio *bio; 3282 struct buf *bp; 3283 int blksize; 3284 int bytes; 3285 int error; 3286 3287 bio = ap->a_bio; 3288 bp = bio->bio_buf; 3289 ip = ap->a_vp->v_data; 3290 hmp = ip->hmp; 3291 3292 blksize = hammer_blocksize(bio->bio_offset); 3293 KKASSERT(bp->b_bufsize == blksize); 3294 3295 if (ip->flags & HAMMER_INODE_RO) { 3296 bp->b_error = EROFS; 3297 bp->b_flags |= B_ERROR; 3298 biodone(ap->a_bio); 3299 return(EROFS); 3300 } 3301 3302 lwkt_gettoken(&hmp->fs_token); 3303 3304 /* 3305 * Disallow swapcache operation on the vnode buffer if double 3306 * buffering is enabled, the swapcache will get the data via 3307 * the block device buffer. 3308 */ 3309 if (hammer_double_buffer) 3310 bp->b_flags |= B_NOTMETA; 3311 3312 /* 3313 * Interlock with inode destruction (no in-kernel or directory 3314 * topology visibility). If we queue new IO while trying to 3315 * destroy the inode we can deadlock the vtrunc call in 3316 * hammer_inode_unloadable_check(). 3317 * 3318 * Besides, there's no point flushing a bp associated with an 3319 * inode that is being destroyed on-media and has no kernel 3320 * references. 3321 */ 3322 if ((ip->flags | ip->sync_flags) & 3323 (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) { 3324 bp->b_resid = 0; 3325 biodone(ap->a_bio); 3326 lwkt_reltoken(&hmp->fs_token); 3327 return(0); 3328 } 3329 3330 /* 3331 * Reserve space and issue a direct-write from the front-end. 3332 * NOTE: The direct_io code will hammer_bread/bcopy smaller 3333 * allocations. 3334 * 3335 * An in-memory record will be installed to reference the storage 3336 * until the flusher can get to it. 3337 * 3338 * Since we own the high level bio the front-end will not try to 3339 * do a direct-read until the write completes. 3340 * 3341 * NOTE: The only time we do not reserve a full-sized buffers 3342 * worth of data is if the file is small. We do not try to 3343 * allocate a fragment (from the small-data zone) at the end of 3344 * an otherwise large file as this can lead to wildly separated 3345 * data. 3346 */ 3347 KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0); 3348 KKASSERT(bio->bio_offset < ip->ino_data.size); 3349 if (bio->bio_offset || ip->ino_data.size > HAMMER_BUFSIZE / 2) 3350 bytes = bp->b_bufsize; 3351 else 3352 bytes = ((int)ip->ino_data.size + 15) & ~15; 3353 3354 record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data, 3355 bytes, &error); 3356 3357 /* 3358 * B_VFSFLAG1 indicates that a REDO_WRITE entry was generated 3359 * in hammer_vop_write(). We must flag the record so the proper 3360 * REDO_TERM_WRITE entry is generated during the flush. 3361 */ 3362 if (record) { 3363 if (bp->b_flags & B_VFSFLAG1) { 3364 record->flags |= HAMMER_RECF_REDO; 3365 bp->b_flags &= ~B_VFSFLAG1; 3366 } 3367 if (record->flags & HAMMER_RECF_DEDUPED) { 3368 bp->b_resid = 0; 3369 hammer_ip_replace_bulk(hmp, record); 3370 biodone(ap->a_bio); 3371 } else { 3372 hammer_io_direct_write(hmp, bio, record); 3373 } 3374 if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs) 3375 hammer_flush_inode(ip, 0); 3376 } else { 3377 bp->b_bio2.bio_offset = NOOFFSET; 3378 bp->b_error = error; 3379 bp->b_flags |= B_ERROR; 3380 biodone(ap->a_bio); 3381 } 3382 lwkt_reltoken(&hmp->fs_token); 3383 return(error); 3384 } 3385 3386 /* 3387 * dounlink - disconnect a directory entry 3388 * 3389 * XXX whiteout support not really in yet 3390 */ 3391 static int 3392 hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch, 3393 struct vnode *dvp, struct ucred *cred, 3394 int flags, int isdir) 3395 { 3396 struct namecache *ncp; 3397 hammer_inode_t dip; 3398 hammer_inode_t ip; 3399 hammer_mount_t hmp; 3400 struct hammer_cursor cursor; 3401 int64_t namekey; 3402 u_int32_t max_iterations; 3403 int nlen, error; 3404 3405 /* 3406 * Calculate the namekey and setup the key range for the scan. This 3407 * works kinda like a chained hash table where the lower 32 bits 3408 * of the namekey synthesize the chain. 3409 * 3410 * The key range is inclusive of both key_beg and key_end. 3411 */ 3412 dip = VTOI(dvp); 3413 ncp = nch->ncp; 3414 hmp = dip->hmp; 3415 3416 if (dip->flags & HAMMER_INODE_RO) 3417 return (EROFS); 3418 3419 namekey = hammer_directory_namekey(dip, ncp->nc_name, ncp->nc_nlen, 3420 &max_iterations); 3421 retry: 3422 hammer_init_cursor(trans, &cursor, &dip->cache[1], dip); 3423 cursor.key_beg.localization = dip->obj_localization + 3424 hammer_dir_localization(dip); 3425 cursor.key_beg.obj_id = dip->obj_id; 3426 cursor.key_beg.key = namekey; 3427 cursor.key_beg.create_tid = 0; 3428 cursor.key_beg.delete_tid = 0; 3429 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 3430 cursor.key_beg.obj_type = 0; 3431 3432 cursor.key_end = cursor.key_beg; 3433 cursor.key_end.key += max_iterations; 3434 cursor.asof = dip->obj_asof; 3435 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 3436 3437 /* 3438 * Scan all matching records (the chain), locate the one matching 3439 * the requested path component. info->last_error contains the 3440 * error code on search termination and could be 0, ENOENT, or 3441 * something else. 3442 * 3443 * The hammer_ip_*() functions merge in-memory records with on-disk 3444 * records for the purposes of the search. 3445 */ 3446 error = hammer_ip_first(&cursor); 3447 3448 while (error == 0) { 3449 error = hammer_ip_resolve_data(&cursor); 3450 if (error) 3451 break; 3452 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF; 3453 KKASSERT(nlen > 0); 3454 if (ncp->nc_nlen == nlen && 3455 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) { 3456 break; 3457 } 3458 error = hammer_ip_next(&cursor); 3459 } 3460 3461 /* 3462 * If all is ok we have to get the inode so we can adjust nlinks. 3463 * To avoid a deadlock with the flusher we must release the inode 3464 * lock on the directory when acquiring the inode for the entry. 3465 * 3466 * If the target is a directory, it must be empty. 3467 */ 3468 if (error == 0) { 3469 hammer_unlock(&cursor.ip->lock); 3470 ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id, 3471 hmp->asof, 3472 cursor.data->entry.localization, 3473 0, &error); 3474 hammer_lock_sh(&cursor.ip->lock); 3475 if (error == ENOENT) { 3476 kprintf("HAMMER: WARNING: Removing " 3477 "dirent w/missing inode \"%s\"\n" 3478 "\tobj_id = %016llx\n", 3479 ncp->nc_name, 3480 (long long)cursor.data->entry.obj_id); 3481 error = 0; 3482 } 3483 3484 /* 3485 * If isdir >= 0 we validate that the entry is or is not a 3486 * directory. If isdir < 0 we don't care. 3487 */ 3488 if (error == 0 && isdir >= 0 && ip) { 3489 if (isdir && 3490 ip->ino_data.obj_type != HAMMER_OBJTYPE_DIRECTORY) { 3491 error = ENOTDIR; 3492 } else if (isdir == 0 && 3493 ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY) { 3494 error = EISDIR; 3495 } 3496 } 3497 3498 /* 3499 * If we are trying to remove a directory the directory must 3500 * be empty. 3501 * 3502 * The check directory code can loop and deadlock/retry. Our 3503 * own cursor's node locks must be released to avoid a 3-way 3504 * deadlock with the flusher if the check directory code 3505 * blocks. 3506 * 3507 * If any changes whatsoever have been made to the cursor 3508 * set EDEADLK and retry. 3509 * 3510 * WARNING: See warnings in hammer_unlock_cursor() 3511 * function. 3512 */ 3513 if (error == 0 && ip && ip->ino_data.obj_type == 3514 HAMMER_OBJTYPE_DIRECTORY) { 3515 hammer_unlock_cursor(&cursor); 3516 error = hammer_ip_check_directory_empty(trans, ip); 3517 hammer_lock_cursor(&cursor); 3518 if (cursor.flags & HAMMER_CURSOR_RETEST) { 3519 kprintf("HAMMER: Warning: avoided deadlock " 3520 "on rmdir '%s'\n", 3521 ncp->nc_name); 3522 error = EDEADLK; 3523 } 3524 } 3525 3526 /* 3527 * Delete the directory entry. 3528 * 3529 * WARNING: hammer_ip_del_directory() may have to terminate 3530 * the cursor to avoid a deadlock. It is ok to call 3531 * hammer_done_cursor() twice. 3532 */ 3533 if (error == 0) { 3534 error = hammer_ip_del_directory(trans, &cursor, 3535 dip, ip); 3536 } 3537 hammer_done_cursor(&cursor); 3538 if (error == 0) { 3539 cache_setunresolved(nch); 3540 cache_setvp(nch, NULL); 3541 3542 /* 3543 * NOTE: ip->vp, if non-NULL, cannot be directly 3544 * referenced without formally acquiring the 3545 * vp since the vp might have zero refs on it, 3546 * or in the middle of a reclaim, etc. 3547 * 3548 * NOTE: The cache_setunresolved() can rip the vp 3549 * out from under us since the vp may not have 3550 * any refs, in which case ip->vp will be NULL 3551 * from the outset. 3552 */ 3553 while (ip && ip->vp) { 3554 struct vnode *vp; 3555 3556 error = hammer_get_vnode(ip, &vp); 3557 if (error == 0 && vp) { 3558 vn_unlock(vp); 3559 hammer_knote(ip->vp, NOTE_DELETE); 3560 cache_inval_vp(ip->vp, CINV_DESTROY); 3561 vrele(vp); 3562 break; 3563 } 3564 kprintf("Debug: HAMMER ip/vp race1 avoided\n"); 3565 } 3566 } 3567 if (ip) 3568 hammer_rel_inode(ip, 0); 3569 } else { 3570 hammer_done_cursor(&cursor); 3571 } 3572 if (error == EDEADLK) 3573 goto retry; 3574 3575 return (error); 3576 } 3577 3578 /************************************************************************ 3579 * FIFO AND SPECFS OPS * 3580 ************************************************************************ 3581 * 3582 */ 3583 static int 3584 hammer_vop_fifoclose (struct vop_close_args *ap) 3585 { 3586 /* XXX update itimes */ 3587 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3588 } 3589 3590 static int 3591 hammer_vop_fiforead (struct vop_read_args *ap) 3592 { 3593 int error; 3594 3595 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 3596 /* XXX update access time */ 3597 return (error); 3598 } 3599 3600 static int 3601 hammer_vop_fifowrite (struct vop_write_args *ap) 3602 { 3603 int error; 3604 3605 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 3606 /* XXX update access time */ 3607 return (error); 3608 } 3609 3610 static 3611 int 3612 hammer_vop_fifokqfilter(struct vop_kqfilter_args *ap) 3613 { 3614 int error; 3615 3616 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 3617 if (error) 3618 error = hammer_vop_kqfilter(ap); 3619 return(error); 3620 } 3621 3622 /************************************************************************ 3623 * KQFILTER OPS * 3624 ************************************************************************ 3625 * 3626 */ 3627 static void filt_hammerdetach(struct knote *kn); 3628 static int filt_hammerread(struct knote *kn, long hint); 3629 static int filt_hammerwrite(struct knote *kn, long hint); 3630 static int filt_hammervnode(struct knote *kn, long hint); 3631 3632 static struct filterops hammerread_filtops = 3633 { FILTEROP_ISFD, NULL, filt_hammerdetach, filt_hammerread }; 3634 static struct filterops hammerwrite_filtops = 3635 { FILTEROP_ISFD, NULL, filt_hammerdetach, filt_hammerwrite }; 3636 static struct filterops hammervnode_filtops = 3637 { FILTEROP_ISFD, NULL, filt_hammerdetach, filt_hammervnode }; 3638 3639 static 3640 int 3641 hammer_vop_kqfilter(struct vop_kqfilter_args *ap) 3642 { 3643 struct vnode *vp = ap->a_vp; 3644 struct knote *kn = ap->a_kn; 3645 3646 switch (kn->kn_filter) { 3647 case EVFILT_READ: 3648 kn->kn_fop = &hammerread_filtops; 3649 break; 3650 case EVFILT_WRITE: 3651 kn->kn_fop = &hammerwrite_filtops; 3652 break; 3653 case EVFILT_VNODE: 3654 kn->kn_fop = &hammervnode_filtops; 3655 break; 3656 default: 3657 return (EOPNOTSUPP); 3658 } 3659 3660 kn->kn_hook = (caddr_t)vp; 3661 3662 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 3663 3664 return(0); 3665 } 3666 3667 static void 3668 filt_hammerdetach(struct knote *kn) 3669 { 3670 struct vnode *vp = (void *)kn->kn_hook; 3671 3672 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 3673 } 3674 3675 static int 3676 filt_hammerread(struct knote *kn, long hint) 3677 { 3678 struct vnode *vp = (void *)kn->kn_hook; 3679 hammer_inode_t ip = VTOI(vp); 3680 hammer_mount_t hmp = ip->hmp; 3681 off_t off; 3682 3683 if (hint == NOTE_REVOKE) { 3684 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 3685 return(1); 3686 } 3687 lwkt_gettoken(&hmp->fs_token); /* XXX use per-ip-token */ 3688 off = ip->ino_data.size - kn->kn_fp->f_offset; 3689 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 3690 lwkt_reltoken(&hmp->fs_token); 3691 if (kn->kn_sfflags & NOTE_OLDAPI) 3692 return(1); 3693 return (kn->kn_data != 0); 3694 } 3695 3696 static int 3697 filt_hammerwrite(struct knote *kn, long hint) 3698 { 3699 if (hint == NOTE_REVOKE) 3700 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 3701 kn->kn_data = 0; 3702 return (1); 3703 } 3704 3705 static int 3706 filt_hammervnode(struct knote *kn, long hint) 3707 { 3708 if (kn->kn_sfflags & hint) 3709 kn->kn_fflags |= hint; 3710 if (hint == NOTE_REVOKE) { 3711 kn->kn_flags |= (EV_EOF | EV_NODATA); 3712 return (1); 3713 } 3714 return (kn->kn_fflags != 0); 3715 } 3716 3717