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 <vfs/fifofs/fifo.h> 50 51 #include <sys/mplock2.h> 52 53 #include "hammer.h" 54 55 /* 56 * USERFS VNOPS 57 */ 58 /*static int hammer_vop_vnoperate(struct vop_generic_args *);*/ 59 static int hammer_vop_fsync(struct vop_fsync_args *); 60 static int hammer_vop_read(struct vop_read_args *); 61 static int hammer_vop_write(struct vop_write_args *); 62 static int hammer_vop_access(struct vop_access_args *); 63 static int hammer_vop_advlock(struct vop_advlock_args *); 64 static int hammer_vop_close(struct vop_close_args *); 65 static int hammer_vop_ncreate(struct vop_ncreate_args *); 66 static int hammer_vop_getattr(struct vop_getattr_args *); 67 static int hammer_vop_nresolve(struct vop_nresolve_args *); 68 static int hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *); 69 static int hammer_vop_nlink(struct vop_nlink_args *); 70 static int hammer_vop_nmkdir(struct vop_nmkdir_args *); 71 static int hammer_vop_nmknod(struct vop_nmknod_args *); 72 static int hammer_vop_open(struct vop_open_args *); 73 static int hammer_vop_print(struct vop_print_args *); 74 static int hammer_vop_readdir(struct vop_readdir_args *); 75 static int hammer_vop_readlink(struct vop_readlink_args *); 76 static int hammer_vop_nremove(struct vop_nremove_args *); 77 static int hammer_vop_nrename(struct vop_nrename_args *); 78 static int hammer_vop_nrmdir(struct vop_nrmdir_args *); 79 static int hammer_vop_markatime(struct vop_markatime_args *); 80 static int hammer_vop_setattr(struct vop_setattr_args *); 81 static int hammer_vop_strategy(struct vop_strategy_args *); 82 static int hammer_vop_bmap(struct vop_bmap_args *ap); 83 static int hammer_vop_nsymlink(struct vop_nsymlink_args *); 84 static int hammer_vop_nwhiteout(struct vop_nwhiteout_args *); 85 static int hammer_vop_ioctl(struct vop_ioctl_args *); 86 static int hammer_vop_mountctl(struct vop_mountctl_args *); 87 static int hammer_vop_kqfilter (struct vop_kqfilter_args *); 88 89 static int hammer_vop_fifoclose (struct vop_close_args *); 90 static int hammer_vop_fiforead (struct vop_read_args *); 91 static int hammer_vop_fifowrite (struct vop_write_args *); 92 static int hammer_vop_fifokqfilter (struct vop_kqfilter_args *); 93 94 struct vop_ops hammer_vnode_vops = { 95 .vop_default = vop_defaultop, 96 .vop_fsync = hammer_vop_fsync, 97 .vop_getpages = vop_stdgetpages, 98 .vop_putpages = vop_stdputpages, 99 .vop_read = hammer_vop_read, 100 .vop_write = hammer_vop_write, 101 .vop_access = hammer_vop_access, 102 .vop_advlock = hammer_vop_advlock, 103 .vop_close = hammer_vop_close, 104 .vop_ncreate = hammer_vop_ncreate, 105 .vop_getattr = hammer_vop_getattr, 106 .vop_inactive = hammer_vop_inactive, 107 .vop_reclaim = hammer_vop_reclaim, 108 .vop_nresolve = hammer_vop_nresolve, 109 .vop_nlookupdotdot = hammer_vop_nlookupdotdot, 110 .vop_nlink = hammer_vop_nlink, 111 .vop_nmkdir = hammer_vop_nmkdir, 112 .vop_nmknod = hammer_vop_nmknod, 113 .vop_open = hammer_vop_open, 114 .vop_pathconf = vop_stdpathconf, 115 .vop_print = hammer_vop_print, 116 .vop_readdir = hammer_vop_readdir, 117 .vop_readlink = hammer_vop_readlink, 118 .vop_nremove = hammer_vop_nremove, 119 .vop_nrename = hammer_vop_nrename, 120 .vop_nrmdir = hammer_vop_nrmdir, 121 .vop_markatime = hammer_vop_markatime, 122 .vop_setattr = hammer_vop_setattr, 123 .vop_bmap = hammer_vop_bmap, 124 .vop_strategy = hammer_vop_strategy, 125 .vop_nsymlink = hammer_vop_nsymlink, 126 .vop_nwhiteout = hammer_vop_nwhiteout, 127 .vop_ioctl = hammer_vop_ioctl, 128 .vop_mountctl = hammer_vop_mountctl, 129 .vop_kqfilter = hammer_vop_kqfilter 130 }; 131 132 struct vop_ops hammer_spec_vops = { 133 .vop_default = vop_defaultop, 134 .vop_fsync = hammer_vop_fsync, 135 .vop_read = vop_stdnoread, 136 .vop_write = vop_stdnowrite, 137 .vop_access = hammer_vop_access, 138 .vop_close = hammer_vop_close, 139 .vop_markatime = hammer_vop_markatime, 140 .vop_getattr = hammer_vop_getattr, 141 .vop_inactive = hammer_vop_inactive, 142 .vop_reclaim = hammer_vop_reclaim, 143 .vop_setattr = hammer_vop_setattr 144 }; 145 146 struct vop_ops hammer_fifo_vops = { 147 .vop_default = fifo_vnoperate, 148 .vop_fsync = hammer_vop_fsync, 149 .vop_read = hammer_vop_fiforead, 150 .vop_write = hammer_vop_fifowrite, 151 .vop_access = hammer_vop_access, 152 .vop_close = hammer_vop_fifoclose, 153 .vop_markatime = hammer_vop_markatime, 154 .vop_getattr = hammer_vop_getattr, 155 .vop_inactive = hammer_vop_inactive, 156 .vop_reclaim = hammer_vop_reclaim, 157 .vop_setattr = hammer_vop_setattr, 158 .vop_kqfilter = hammer_vop_fifokqfilter 159 }; 160 161 static __inline 162 void 163 hammer_knote(struct vnode *vp, int flags) 164 { 165 if (flags) 166 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags); 167 } 168 169 #ifdef DEBUG_TRUNCATE 170 struct hammer_inode *HammerTruncIp; 171 #endif 172 173 static int hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch, 174 struct vnode *dvp, struct ucred *cred, 175 int flags, int isdir); 176 static int hammer_vop_strategy_read(struct vop_strategy_args *ap); 177 static int hammer_vop_strategy_write(struct vop_strategy_args *ap); 178 179 #if 0 180 static 181 int 182 hammer_vop_vnoperate(struct vop_generic_args *) 183 { 184 return (VOCALL(&hammer_vnode_vops, ap)); 185 } 186 #endif 187 188 /* 189 * hammer_vop_fsync { vp, waitfor } 190 * 191 * fsync() an inode to disk and wait for it to be completely committed 192 * such that the information would not be undone if a crash occured after 193 * return. 194 * 195 * NOTE: HAMMER's fsync()'s are going to remain expensive until we implement 196 * a REDO log. A sysctl is provided to relax HAMMER's fsync() 197 * operation. 198 * 199 * Ultimately the combination of a REDO log and use of fast storage 200 * to front-end cluster caches will make fsync fast, but it aint 201 * here yet. And, in anycase, we need real transactional 202 * all-or-nothing features which are not restricted to a single file. 203 */ 204 static 205 int 206 hammer_vop_fsync(struct vop_fsync_args *ap) 207 { 208 hammer_inode_t ip = VTOI(ap->a_vp); 209 hammer_mount_t hmp = ip->hmp; 210 int waitfor = ap->a_waitfor; 211 int mode; 212 213 /* 214 * Fsync rule relaxation (default is either full synchronous flush 215 * or REDO semantics with synchronous flush). 216 */ 217 if (ap->a_flags & VOP_FSYNC_SYSCALL) { 218 switch(hammer_fsync_mode) { 219 case 0: 220 mode0: 221 /* no REDO, full synchronous flush */ 222 goto skip; 223 case 1: 224 mode1: 225 /* no REDO, full asynchronous flush */ 226 if (waitfor == MNT_WAIT) 227 waitfor = MNT_NOWAIT; 228 goto skip; 229 case 2: 230 /* REDO semantics, synchronous flush */ 231 if (hmp->version < HAMMER_VOL_VERSION_FOUR) 232 goto mode0; 233 mode = HAMMER_FLUSH_UNDOS_AUTO; 234 break; 235 case 3: 236 /* REDO semantics, relaxed asynchronous flush */ 237 if (hmp->version < HAMMER_VOL_VERSION_FOUR) 238 goto mode1; 239 mode = HAMMER_FLUSH_UNDOS_RELAXED; 240 if (waitfor == MNT_WAIT) 241 waitfor = MNT_NOWAIT; 242 break; 243 case 4: 244 /* ignore the fsync() system call */ 245 return(0); 246 default: 247 /* we have to do something */ 248 mode = HAMMER_FLUSH_UNDOS_RELAXED; 249 if (waitfor == MNT_WAIT) 250 waitfor = MNT_NOWAIT; 251 break; 252 } 253 254 /* 255 * Fast fsync only needs to flush the UNDO/REDO fifo if 256 * HAMMER_INODE_REDO is non-zero and the only modifications 257 * made to the file are write or write-extends. 258 */ 259 if ((ip->flags & HAMMER_INODE_REDO) && 260 (ip->flags & HAMMER_INODE_MODMASK_NOREDO) == 0 261 ) { 262 ++hammer_count_fsyncs; 263 hammer_flusher_flush_undos(hmp, mode); 264 ip->redo_count = 0; 265 return(0); 266 } 267 268 /* 269 * REDO is enabled by fsync(), the idea being we really only 270 * want to lay down REDO records when programs are using 271 * fsync() heavily. The first fsync() on the file starts 272 * the gravy train going and later fsync()s keep it hot by 273 * resetting the redo_count. 274 * 275 * We weren't running REDOs before now so we have to fall 276 * through and do a full fsync of what we have. 277 */ 278 if (hmp->version >= HAMMER_VOL_VERSION_FOUR && 279 (hmp->flags & HAMMER_MOUNT_REDO_RECOVERY_RUN) == 0) { 280 ip->flags |= HAMMER_INODE_REDO; 281 ip->redo_count = 0; 282 } 283 } 284 skip: 285 286 /* 287 * Do a full flush sequence. 288 */ 289 ++hammer_count_fsyncs; 290 vfsync(ap->a_vp, waitfor, 1, NULL, NULL); 291 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 292 if (waitfor == MNT_WAIT) { 293 vn_unlock(ap->a_vp); 294 hammer_wait_inode(ip); 295 vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY); 296 } 297 return (ip->error); 298 } 299 300 /* 301 * hammer_vop_read { vp, uio, ioflag, cred } 302 * 303 * MPALMOSTSAFE 304 */ 305 static 306 int 307 hammer_vop_read(struct vop_read_args *ap) 308 { 309 struct hammer_transaction trans; 310 hammer_inode_t ip; 311 off_t offset; 312 struct buf *bp; 313 struct uio *uio; 314 int error; 315 int n; 316 int seqcount; 317 int ioseqcount; 318 int blksize; 319 int got_mplock; 320 int bigread; 321 322 if (ap->a_vp->v_type != VREG) 323 return (EINVAL); 324 ip = VTOI(ap->a_vp); 325 error = 0; 326 uio = ap->a_uio; 327 328 /* 329 * Allow the UIO's size to override the sequential heuristic. 330 */ 331 blksize = hammer_blocksize(uio->uio_offset); 332 seqcount = (uio->uio_resid + (BKVASIZE - 1)) / BKVASIZE; 333 ioseqcount = (ap->a_ioflag >> 16); 334 if (seqcount < ioseqcount) 335 seqcount = ioseqcount; 336 337 /* 338 * Temporary hack until more of HAMMER can be made MPSAFE. 339 */ 340 #ifdef SMP 341 if (curthread->td_mpcount) { 342 got_mplock = -1; 343 hammer_start_transaction(&trans, ip->hmp); 344 } else { 345 got_mplock = 0; 346 } 347 #else 348 hammer_start_transaction(&trans, ip->hmp); 349 got_mplock = -1; 350 #endif 351 352 /* 353 * If reading or writing a huge amount of data we have to break 354 * atomicy and allow the operation to be interrupted by a signal 355 * or it can DOS the machine. 356 */ 357 bigread = (uio->uio_resid > 100 * 1024 * 1024); 358 359 /* 360 * Access the data typically in HAMMER_BUFSIZE blocks via the 361 * buffer cache, but HAMMER may use a variable block size based 362 * on the offset. 363 * 364 * XXX Temporary hack, delay the start transaction while we remain 365 * MPSAFE. NOTE: ino_data.size cannot change while vnode is 366 * locked-shared. 367 */ 368 while (uio->uio_resid > 0 && uio->uio_offset < ip->ino_data.size) { 369 int64_t base_offset; 370 int64_t file_limit; 371 372 blksize = hammer_blocksize(uio->uio_offset); 373 offset = (int)uio->uio_offset & (blksize - 1); 374 base_offset = uio->uio_offset - offset; 375 376 if (bigread && (error = hammer_signal_check(ip->hmp)) != 0) 377 break; 378 379 /* 380 * MPSAFE 381 */ 382 bp = getcacheblk(ap->a_vp, base_offset); 383 if (bp) { 384 error = 0; 385 goto skip; 386 } 387 388 /* 389 * MPUNSAFE 390 */ 391 if (got_mplock == 0) { 392 got_mplock = 1; 393 get_mplock(); 394 hammer_start_transaction(&trans, ip->hmp); 395 } 396 397 if (hammer_cluster_enable) { 398 /* 399 * Use file_limit to prevent cluster_read() from 400 * creating buffers of the wrong block size past 401 * the demarc. 402 */ 403 file_limit = ip->ino_data.size; 404 if (base_offset < HAMMER_XDEMARC && 405 file_limit > HAMMER_XDEMARC) { 406 file_limit = HAMMER_XDEMARC; 407 } 408 error = cluster_read(ap->a_vp, 409 file_limit, base_offset, 410 blksize, MAXPHYS, 411 seqcount, &bp); 412 } else { 413 error = bread(ap->a_vp, base_offset, blksize, &bp); 414 } 415 if (error) { 416 brelse(bp); 417 break; 418 } 419 skip: 420 421 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */ 422 n = blksize - offset; 423 if (n > uio->uio_resid) 424 n = uio->uio_resid; 425 if (n > ip->ino_data.size - uio->uio_offset) 426 n = (int)(ip->ino_data.size - uio->uio_offset); 427 error = uiomove((char *)bp->b_data + offset, n, uio); 428 429 /* data has a lower priority then meta-data */ 430 bp->b_flags |= B_AGE; 431 bqrelse(bp); 432 if (error) 433 break; 434 hammer_stats_file_read += n; 435 } 436 437 /* 438 * XXX only update the atime if we had to get the MP lock. 439 * XXX hack hack hack, fixme. 440 */ 441 if (got_mplock) { 442 if ((ip->flags & HAMMER_INODE_RO) == 0 && 443 (ip->hmp->mp->mnt_flag & MNT_NOATIME) == 0) { 444 ip->ino_data.atime = trans.time; 445 hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME); 446 } 447 hammer_done_transaction(&trans); 448 if (got_mplock > 0) 449 rel_mplock(); 450 } 451 return (error); 452 } 453 454 /* 455 * hammer_vop_write { vp, uio, ioflag, cred } 456 */ 457 static 458 int 459 hammer_vop_write(struct vop_write_args *ap) 460 { 461 struct hammer_transaction trans; 462 struct hammer_inode *ip; 463 hammer_mount_t hmp; 464 struct uio *uio; 465 int offset; 466 off_t base_offset; 467 struct buf *bp; 468 int kflags; 469 int error; 470 int n; 471 int flags; 472 int seqcount; 473 int bigwrite; 474 475 if (ap->a_vp->v_type != VREG) 476 return (EINVAL); 477 ip = VTOI(ap->a_vp); 478 hmp = ip->hmp; 479 error = 0; 480 kflags = 0; 481 seqcount = ap->a_ioflag >> 16; 482 483 if (ip->flags & HAMMER_INODE_RO) 484 return (EROFS); 485 486 /* 487 * Create a transaction to cover the operations we perform. 488 */ 489 hammer_start_transaction(&trans, hmp); 490 uio = ap->a_uio; 491 492 /* 493 * Check append mode 494 */ 495 if (ap->a_ioflag & IO_APPEND) 496 uio->uio_offset = ip->ino_data.size; 497 498 /* 499 * Check for illegal write offsets. Valid range is 0...2^63-1. 500 * 501 * NOTE: the base_off assignment is required to work around what 502 * I consider to be a GCC-4 optimization bug. 503 */ 504 if (uio->uio_offset < 0) { 505 hammer_done_transaction(&trans); 506 return (EFBIG); 507 } 508 base_offset = uio->uio_offset + uio->uio_resid; /* work around gcc-4 */ 509 if (uio->uio_resid > 0 && base_offset <= uio->uio_offset) { 510 hammer_done_transaction(&trans); 511 return (EFBIG); 512 } 513 514 /* 515 * If reading or writing a huge amount of data we have to break 516 * atomicy and allow the operation to be interrupted by a signal 517 * or it can DOS the machine. 518 * 519 * Preset redo_count so we stop generating REDOs earlier if the 520 * limit is exceeded. 521 */ 522 bigwrite = (uio->uio_resid > 100 * 1024 * 1024); 523 if ((ip->flags & HAMMER_INODE_REDO) && 524 ip->redo_count < hammer_limit_redo) { 525 ip->redo_count += uio->uio_resid; 526 } 527 528 /* 529 * Access the data typically in HAMMER_BUFSIZE blocks via the 530 * buffer cache, but HAMMER may use a variable block size based 531 * on the offset. 532 */ 533 while (uio->uio_resid > 0) { 534 int fixsize = 0; 535 int blksize; 536 int blkmask; 537 int trivial; 538 int endofblk; 539 off_t nsize; 540 541 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE)) != 0) 542 break; 543 if (bigwrite && (error = hammer_signal_check(hmp)) != 0) 544 break; 545 546 blksize = hammer_blocksize(uio->uio_offset); 547 548 /* 549 * Do not allow HAMMER to blow out the buffer cache. Very 550 * large UIOs can lockout other processes due to bwillwrite() 551 * mechanics. 552 * 553 * The hammer inode is not locked during these operations. 554 * The vnode is locked which can interfere with the pageout 555 * daemon for non-UIO_NOCOPY writes but should not interfere 556 * with the buffer cache. Even so, we cannot afford to 557 * allow the pageout daemon to build up too many dirty buffer 558 * cache buffers. 559 * 560 * Only call this if we aren't being recursively called from 561 * a virtual disk device (vn), else we may deadlock. 562 */ 563 if ((ap->a_ioflag & IO_RECURSE) == 0) 564 bwillwrite(blksize); 565 566 /* 567 * Control the number of pending records associated with 568 * this inode. If too many have accumulated start a 569 * flush. Try to maintain a pipeline with the flusher. 570 */ 571 if (ip->rsv_recs >= hammer_limit_inode_recs) { 572 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 573 } 574 if (ip->rsv_recs >= hammer_limit_inode_recs * 2) { 575 while (ip->rsv_recs >= hammer_limit_inode_recs) { 576 tsleep(&ip->rsv_recs, 0, "hmrwww", hz); 577 } 578 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 579 } 580 581 #if 0 582 /* 583 * Do not allow HAMMER to blow out system memory by 584 * accumulating too many records. Records are so well 585 * decoupled from the buffer cache that it is possible 586 * for userland to push data out to the media via 587 * direct-write, but build up the records queued to the 588 * backend faster then the backend can flush them out. 589 * HAMMER has hit its write limit but the frontend has 590 * no pushback to slow it down. 591 */ 592 if (hmp->rsv_recs > hammer_limit_recs / 2) { 593 /* 594 * Get the inode on the flush list 595 */ 596 if (ip->rsv_recs >= 64) 597 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 598 else if (ip->rsv_recs >= 16) 599 hammer_flush_inode(ip, 0); 600 601 /* 602 * Keep the flusher going if the system keeps 603 * queueing records. 604 */ 605 delta = hmp->count_newrecords - 606 hmp->last_newrecords; 607 if (delta < 0 || delta > hammer_limit_recs / 2) { 608 hmp->last_newrecords = hmp->count_newrecords; 609 hammer_sync_hmp(hmp, MNT_NOWAIT); 610 } 611 612 /* 613 * If we have gotten behind start slowing 614 * down the writers. 615 */ 616 delta = (hmp->rsv_recs - hammer_limit_recs) * 617 hz / hammer_limit_recs; 618 if (delta > 0) 619 tsleep(&trans, 0, "hmrslo", delta); 620 } 621 #endif 622 623 /* 624 * Calculate the blocksize at the current offset and figure 625 * out how much we can actually write. 626 */ 627 blkmask = blksize - 1; 628 offset = (int)uio->uio_offset & blkmask; 629 base_offset = uio->uio_offset & ~(int64_t)blkmask; 630 n = blksize - offset; 631 if (n > uio->uio_resid) { 632 n = uio->uio_resid; 633 endofblk = 0; 634 } else { 635 endofblk = 1; 636 } 637 nsize = uio->uio_offset + n; 638 if (nsize > ip->ino_data.size) { 639 if (uio->uio_offset > ip->ino_data.size) 640 trivial = 0; 641 else 642 trivial = 1; 643 nvextendbuf(ap->a_vp, 644 ip->ino_data.size, 645 nsize, 646 hammer_blocksize(ip->ino_data.size), 647 hammer_blocksize(nsize), 648 hammer_blockoff(ip->ino_data.size), 649 hammer_blockoff(nsize), 650 trivial); 651 fixsize = 1; 652 kflags |= NOTE_EXTEND; 653 } 654 655 if (uio->uio_segflg == UIO_NOCOPY) { 656 /* 657 * Issuing a write with the same data backing the 658 * buffer. Instantiate the buffer to collect the 659 * backing vm pages, then read-in any missing bits. 660 * 661 * This case is used by vop_stdputpages(). 662 */ 663 bp = getblk(ap->a_vp, base_offset, 664 blksize, GETBLK_BHEAVY, 0); 665 if ((bp->b_flags & B_CACHE) == 0) { 666 bqrelse(bp); 667 error = bread(ap->a_vp, base_offset, 668 blksize, &bp); 669 } 670 } else if (offset == 0 && uio->uio_resid >= blksize) { 671 /* 672 * Even though we are entirely overwriting the buffer 673 * we may still have to zero it out to avoid a 674 * mmap/write visibility issue. 675 */ 676 bp = getblk(ap->a_vp, base_offset, blksize, GETBLK_BHEAVY, 0); 677 if ((bp->b_flags & B_CACHE) == 0) 678 vfs_bio_clrbuf(bp); 679 } else if (base_offset >= ip->ino_data.size) { 680 /* 681 * If the base offset of the buffer is beyond the 682 * file EOF, we don't have to issue a read. 683 */ 684 bp = getblk(ap->a_vp, base_offset, 685 blksize, GETBLK_BHEAVY, 0); 686 vfs_bio_clrbuf(bp); 687 } else { 688 /* 689 * Partial overwrite, read in any missing bits then 690 * replace the portion being written. 691 */ 692 error = bread(ap->a_vp, base_offset, blksize, &bp); 693 if (error == 0) 694 bheavy(bp); 695 } 696 if (error == 0) 697 error = uiomove(bp->b_data + offset, n, uio); 698 699 /* 700 * Generate REDO records if enabled and redo_count will not 701 * exceeded the limit. 702 * 703 * If redo_count exceeds the limit we stop generating records 704 * and clear HAMMER_INODE_REDO. This will cause the next 705 * fsync() to do a full meta-data sync instead of just an 706 * UNDO/REDO fifo update. 707 * 708 * When clearing HAMMER_INODE_REDO any pre-existing REDOs 709 * will still be tracked. The tracks will be terminated 710 * when the related meta-data (including possible data 711 * modifications which are not tracked via REDO) is 712 * flushed. 713 */ 714 if ((ip->flags & HAMMER_INODE_REDO) && error == 0) { 715 if (ip->redo_count < hammer_limit_redo) { 716 bp->b_flags |= B_VFSFLAG1; 717 error = hammer_generate_redo(&trans, ip, 718 base_offset + offset, 719 HAMMER_REDO_WRITE, 720 bp->b_data + offset, 721 (size_t)n); 722 } else { 723 ip->flags &= ~HAMMER_INODE_REDO; 724 } 725 } 726 727 /* 728 * If we screwed up we have to undo any VM size changes we 729 * made. 730 */ 731 if (error) { 732 brelse(bp); 733 if (fixsize) { 734 nvtruncbuf(ap->a_vp, ip->ino_data.size, 735 hammer_blocksize(ip->ino_data.size), 736 hammer_blockoff(ip->ino_data.size)); 737 } 738 break; 739 } 740 kflags |= NOTE_WRITE; 741 hammer_stats_file_write += n; 742 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */ 743 if (ip->ino_data.size < uio->uio_offset) { 744 ip->ino_data.size = uio->uio_offset; 745 flags = HAMMER_INODE_SDIRTY; 746 } else { 747 flags = 0; 748 } 749 ip->ino_data.mtime = trans.time; 750 flags |= HAMMER_INODE_MTIME | HAMMER_INODE_BUFS; 751 hammer_modify_inode(&trans, ip, flags); 752 753 /* 754 * Once we dirty the buffer any cached zone-X offset 755 * becomes invalid. HAMMER NOTE: no-history mode cannot 756 * allow overwriting over the same data sector unless 757 * we provide UNDOs for the old data, which we don't. 758 */ 759 bp->b_bio2.bio_offset = NOOFFSET; 760 761 /* 762 * Final buffer disposition. 763 * 764 * Because meta-data updates are deferred, HAMMER is 765 * especially sensitive to excessive bdwrite()s because 766 * the I/O stream is not broken up by disk reads. So the 767 * buffer cache simply cannot keep up. 768 * 769 * WARNING! blksize is variable. cluster_write() is 770 * expected to not blow up if it encounters 771 * buffers that do not match the passed blksize. 772 * 773 * NOTE! Hammer shouldn't need to bawrite()/cluster_write(). 774 * The ip->rsv_recs check should burst-flush the data. 775 * If we queue it immediately the buf could be left 776 * locked on the device queue for a very long time. 777 * 778 * NOTE! To avoid degenerate stalls due to mismatched block 779 * sizes we only honor IO_DIRECT on the write which 780 * abuts the end of the buffer. However, we must 781 * honor IO_SYNC in case someone is silly enough to 782 * configure a HAMMER file as swap, or when HAMMER 783 * is serving NFS (for commits). Ick ick. 784 */ 785 bp->b_flags |= B_AGE; 786 if (ap->a_ioflag & IO_SYNC) { 787 bwrite(bp); 788 } else if ((ap->a_ioflag & IO_DIRECT) && endofblk) { 789 bawrite(bp); 790 } else { 791 #if 0 792 if (offset + n == blksize) { 793 if (hammer_cluster_enable == 0 || 794 (ap->a_vp->v_mount->mnt_flag & MNT_NOCLUSTERW)) { 795 bawrite(bp); 796 } else { 797 cluster_write(bp, ip->ino_data.size, 798 blksize, seqcount); 799 } 800 } else { 801 #endif 802 bdwrite(bp); 803 } 804 } 805 hammer_done_transaction(&trans); 806 hammer_knote(ap->a_vp, kflags); 807 return (error); 808 } 809 810 /* 811 * hammer_vop_access { vp, mode, cred } 812 */ 813 static 814 int 815 hammer_vop_access(struct vop_access_args *ap) 816 { 817 struct hammer_inode *ip = VTOI(ap->a_vp); 818 uid_t uid; 819 gid_t gid; 820 int error; 821 822 ++hammer_stats_file_iopsr; 823 uid = hammer_to_unix_xid(&ip->ino_data.uid); 824 gid = hammer_to_unix_xid(&ip->ino_data.gid); 825 826 error = vop_helper_access(ap, uid, gid, ip->ino_data.mode, 827 ip->ino_data.uflags); 828 return (error); 829 } 830 831 /* 832 * hammer_vop_advlock { vp, id, op, fl, flags } 833 */ 834 static 835 int 836 hammer_vop_advlock(struct vop_advlock_args *ap) 837 { 838 hammer_inode_t ip = VTOI(ap->a_vp); 839 840 return (lf_advlock(ap, &ip->advlock, ip->ino_data.size)); 841 } 842 843 /* 844 * hammer_vop_close { vp, fflag } 845 * 846 * We can only sync-on-close for normal closes. 847 */ 848 static 849 int 850 hammer_vop_close(struct vop_close_args *ap) 851 { 852 #if 0 853 struct vnode *vp = ap->a_vp; 854 hammer_inode_t ip = VTOI(vp); 855 int waitfor; 856 if (ip->flags & (HAMMER_INODE_CLOSESYNC|HAMMER_INODE_CLOSEASYNC)) { 857 if (vn_islocked(vp) == LK_EXCLUSIVE && 858 (vp->v_flag & (VINACTIVE|VRECLAIMED)) == 0) { 859 if (ip->flags & HAMMER_INODE_CLOSESYNC) 860 waitfor = MNT_WAIT; 861 else 862 waitfor = MNT_NOWAIT; 863 ip->flags &= ~(HAMMER_INODE_CLOSESYNC | 864 HAMMER_INODE_CLOSEASYNC); 865 VOP_FSYNC(vp, MNT_NOWAIT, waitfor); 866 } 867 } 868 #endif 869 return (vop_stdclose(ap)); 870 } 871 872 /* 873 * hammer_vop_ncreate { nch, dvp, vpp, cred, vap } 874 * 875 * The operating system has already ensured that the directory entry 876 * does not exist and done all appropriate namespace locking. 877 */ 878 static 879 int 880 hammer_vop_ncreate(struct vop_ncreate_args *ap) 881 { 882 struct hammer_transaction trans; 883 struct hammer_inode *dip; 884 struct hammer_inode *nip; 885 struct nchandle *nch; 886 int error; 887 888 nch = ap->a_nch; 889 dip = VTOI(ap->a_dvp); 890 891 if (dip->flags & HAMMER_INODE_RO) 892 return (EROFS); 893 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) 894 return (error); 895 896 /* 897 * Create a transaction to cover the operations we perform. 898 */ 899 hammer_start_transaction(&trans, dip->hmp); 900 ++hammer_stats_file_iopsw; 901 902 /* 903 * Create a new filesystem object of the requested type. The 904 * returned inode will be referenced and shared-locked to prevent 905 * it from being moved to the flusher. 906 */ 907 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 908 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 909 NULL, &nip); 910 if (error) { 911 hkprintf("hammer_create_inode error %d\n", error); 912 hammer_done_transaction(&trans); 913 *ap->a_vpp = NULL; 914 return (error); 915 } 916 917 /* 918 * Add the new filesystem object to the directory. This will also 919 * bump the inode's link count. 920 */ 921 error = hammer_ip_add_directory(&trans, dip, 922 nch->ncp->nc_name, nch->ncp->nc_nlen, 923 nip); 924 if (error) 925 hkprintf("hammer_ip_add_directory error %d\n", error); 926 927 /* 928 * Finish up. 929 */ 930 if (error) { 931 hammer_rel_inode(nip, 0); 932 hammer_done_transaction(&trans); 933 *ap->a_vpp = NULL; 934 } else { 935 error = hammer_get_vnode(nip, ap->a_vpp); 936 hammer_done_transaction(&trans); 937 hammer_rel_inode(nip, 0); 938 if (error == 0) { 939 cache_setunresolved(ap->a_nch); 940 cache_setvp(ap->a_nch, *ap->a_vpp); 941 } 942 hammer_knote(ap->a_dvp, NOTE_WRITE); 943 } 944 return (error); 945 } 946 947 /* 948 * hammer_vop_getattr { vp, vap } 949 * 950 * Retrieve an inode's attribute information. When accessing inodes 951 * historically we fake the atime field to ensure consistent results. 952 * The atime field is stored in the B-Tree element and allowed to be 953 * updated without cycling the element. 954 * 955 * MPSAFE 956 */ 957 static 958 int 959 hammer_vop_getattr(struct vop_getattr_args *ap) 960 { 961 struct hammer_inode *ip = VTOI(ap->a_vp); 962 struct vattr *vap = ap->a_vap; 963 964 /* 965 * We want the fsid to be different when accessing a filesystem 966 * with different as-of's so programs like diff don't think 967 * the files are the same. 968 * 969 * We also want the fsid to be the same when comparing snapshots, 970 * or when comparing mirrors (which might be backed by different 971 * physical devices). HAMMER fsids are based on the PFS's 972 * shared_uuid field. 973 * 974 * XXX there is a chance of collision here. The va_fsid reported 975 * by stat is different from the more involved fsid used in the 976 * mount structure. 977 */ 978 ++hammer_stats_file_iopsr; 979 hammer_lock_sh(&ip->lock); 980 vap->va_fsid = ip->pfsm->fsid_udev ^ (u_int32_t)ip->obj_asof ^ 981 (u_int32_t)(ip->obj_asof >> 32); 982 983 vap->va_fileid = ip->ino_leaf.base.obj_id; 984 vap->va_mode = ip->ino_data.mode; 985 vap->va_nlink = ip->ino_data.nlinks; 986 vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid); 987 vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid); 988 vap->va_rmajor = 0; 989 vap->va_rminor = 0; 990 vap->va_size = ip->ino_data.size; 991 992 /* 993 * Special case for @@PFS softlinks. The actual size of the 994 * expanded softlink is "@@0x%016llx:%05d" == 26 bytes. 995 * or for MAX_TID is "@@-1:%05d" == 10 bytes. 996 */ 997 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_SOFTLINK && 998 ip->ino_data.size == 10 && 999 ip->obj_asof == HAMMER_MAX_TID && 1000 ip->obj_localization == 0 && 1001 strncmp(ip->ino_data.ext.symlink, "@@PFS", 5) == 0) { 1002 if (ip->pfsm->pfsd.mirror_flags & HAMMER_PFSD_SLAVE) 1003 vap->va_size = 26; 1004 else 1005 vap->va_size = 10; 1006 } 1007 1008 /* 1009 * We must provide a consistent atime and mtime for snapshots 1010 * so people can do a 'tar cf - ... | md5' on them and get 1011 * consistent results. 1012 */ 1013 if (ip->flags & HAMMER_INODE_RO) { 1014 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_atime); 1015 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_mtime); 1016 } else { 1017 hammer_time_to_timespec(ip->ino_data.atime, &vap->va_atime); 1018 hammer_time_to_timespec(ip->ino_data.mtime, &vap->va_mtime); 1019 } 1020 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_ctime); 1021 vap->va_flags = ip->ino_data.uflags; 1022 vap->va_gen = 1; /* hammer inums are unique for all time */ 1023 vap->va_blocksize = HAMMER_BUFSIZE; 1024 if (ip->ino_data.size >= HAMMER_XDEMARC) { 1025 vap->va_bytes = (ip->ino_data.size + HAMMER_XBUFMASK64) & 1026 ~HAMMER_XBUFMASK64; 1027 } else if (ip->ino_data.size > HAMMER_BUFSIZE / 2) { 1028 vap->va_bytes = (ip->ino_data.size + HAMMER_BUFMASK64) & 1029 ~HAMMER_BUFMASK64; 1030 } else { 1031 vap->va_bytes = (ip->ino_data.size + 15) & ~15; 1032 } 1033 1034 vap->va_type = hammer_get_vnode_type(ip->ino_data.obj_type); 1035 vap->va_filerev = 0; /* XXX */ 1036 vap->va_uid_uuid = ip->ino_data.uid; 1037 vap->va_gid_uuid = ip->ino_data.gid; 1038 vap->va_fsid_uuid = ip->hmp->fsid; 1039 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID | 1040 VA_FSID_UUID_VALID; 1041 1042 switch (ip->ino_data.obj_type) { 1043 case HAMMER_OBJTYPE_CDEV: 1044 case HAMMER_OBJTYPE_BDEV: 1045 vap->va_rmajor = ip->ino_data.rmajor; 1046 vap->va_rminor = ip->ino_data.rminor; 1047 break; 1048 default: 1049 break; 1050 } 1051 hammer_unlock(&ip->lock); 1052 return(0); 1053 } 1054 1055 /* 1056 * hammer_vop_nresolve { nch, dvp, cred } 1057 * 1058 * Locate the requested directory entry. 1059 */ 1060 static 1061 int 1062 hammer_vop_nresolve(struct vop_nresolve_args *ap) 1063 { 1064 struct hammer_transaction trans; 1065 struct namecache *ncp; 1066 hammer_inode_t dip; 1067 hammer_inode_t ip; 1068 hammer_tid_t asof; 1069 struct hammer_cursor cursor; 1070 struct vnode *vp; 1071 int64_t namekey; 1072 int error; 1073 int i; 1074 int nlen; 1075 int flags; 1076 int ispfs; 1077 int64_t obj_id; 1078 u_int32_t localization; 1079 u_int32_t max_iterations; 1080 1081 /* 1082 * Misc initialization, plus handle as-of name extensions. Look for 1083 * the '@@' extension. Note that as-of files and directories cannot 1084 * be modified. 1085 */ 1086 dip = VTOI(ap->a_dvp); 1087 ncp = ap->a_nch->ncp; 1088 asof = dip->obj_asof; 1089 localization = dip->obj_localization; /* for code consistency */ 1090 nlen = ncp->nc_nlen; 1091 flags = dip->flags & HAMMER_INODE_RO; 1092 ispfs = 0; 1093 1094 hammer_simple_transaction(&trans, dip->hmp); 1095 ++hammer_stats_file_iopsr; 1096 1097 for (i = 0; i < nlen; ++i) { 1098 if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') { 1099 error = hammer_str_to_tid(ncp->nc_name + i + 2, 1100 &ispfs, &asof, &localization); 1101 if (error != 0) { 1102 i = nlen; 1103 break; 1104 } 1105 if (asof != HAMMER_MAX_TID) 1106 flags |= HAMMER_INODE_RO; 1107 break; 1108 } 1109 } 1110 nlen = i; 1111 1112 /* 1113 * If this is a PFS softlink we dive into the PFS 1114 */ 1115 if (ispfs && nlen == 0) { 1116 ip = hammer_get_inode(&trans, dip, HAMMER_OBJID_ROOT, 1117 asof, localization, 1118 flags, &error); 1119 if (error == 0) { 1120 error = hammer_get_vnode(ip, &vp); 1121 hammer_rel_inode(ip, 0); 1122 } else { 1123 vp = NULL; 1124 } 1125 if (error == 0) { 1126 vn_unlock(vp); 1127 cache_setvp(ap->a_nch, vp); 1128 vrele(vp); 1129 } 1130 goto done; 1131 } 1132 1133 /* 1134 * If there is no path component the time extension is relative to dip. 1135 * e.g. "fubar/@@<snapshot>" 1136 * 1137 * "." is handled by the kernel, but ".@@<snapshot>" is not. 1138 * e.g. "fubar/.@@<snapshot>" 1139 * 1140 * ".." is handled by the kernel. We do not currently handle 1141 * "..@<snapshot>". 1142 */ 1143 if (nlen == 0 || (nlen == 1 && ncp->nc_name[0] == '.')) { 1144 ip = hammer_get_inode(&trans, dip, dip->obj_id, 1145 asof, dip->obj_localization, 1146 flags, &error); 1147 if (error == 0) { 1148 error = hammer_get_vnode(ip, &vp); 1149 hammer_rel_inode(ip, 0); 1150 } else { 1151 vp = NULL; 1152 } 1153 if (error == 0) { 1154 vn_unlock(vp); 1155 cache_setvp(ap->a_nch, vp); 1156 vrele(vp); 1157 } 1158 goto done; 1159 } 1160 1161 /* 1162 * Calculate the namekey and setup the key range for the scan. This 1163 * works kinda like a chained hash table where the lower 32 bits 1164 * of the namekey synthesize the chain. 1165 * 1166 * The key range is inclusive of both key_beg and key_end. 1167 */ 1168 namekey = hammer_directory_namekey(dip, ncp->nc_name, nlen, 1169 &max_iterations); 1170 1171 error = hammer_init_cursor(&trans, &cursor, &dip->cache[1], dip); 1172 cursor.key_beg.localization = dip->obj_localization + 1173 hammer_dir_localization(dip); 1174 cursor.key_beg.obj_id = dip->obj_id; 1175 cursor.key_beg.key = namekey; 1176 cursor.key_beg.create_tid = 0; 1177 cursor.key_beg.delete_tid = 0; 1178 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 1179 cursor.key_beg.obj_type = 0; 1180 1181 cursor.key_end = cursor.key_beg; 1182 cursor.key_end.key += max_iterations; 1183 cursor.asof = asof; 1184 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 1185 1186 /* 1187 * Scan all matching records (the chain), locate the one matching 1188 * the requested path component. 1189 * 1190 * The hammer_ip_*() functions merge in-memory records with on-disk 1191 * records for the purposes of the search. 1192 */ 1193 obj_id = 0; 1194 localization = HAMMER_DEF_LOCALIZATION; 1195 1196 if (error == 0) { 1197 error = hammer_ip_first(&cursor); 1198 while (error == 0) { 1199 error = hammer_ip_resolve_data(&cursor); 1200 if (error) 1201 break; 1202 if (nlen == cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF && 1203 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) { 1204 obj_id = cursor.data->entry.obj_id; 1205 localization = cursor.data->entry.localization; 1206 break; 1207 } 1208 error = hammer_ip_next(&cursor); 1209 } 1210 } 1211 hammer_done_cursor(&cursor); 1212 1213 /* 1214 * Lookup the obj_id. This should always succeed. If it does not 1215 * the filesystem may be damaged and we return a dummy inode. 1216 */ 1217 if (error == 0) { 1218 ip = hammer_get_inode(&trans, dip, obj_id, 1219 asof, localization, 1220 flags, &error); 1221 if (error == ENOENT) { 1222 kprintf("HAMMER: WARNING: Missing " 1223 "inode for dirent \"%s\"\n" 1224 "\tobj_id = %016llx, asof=%016llx, lo=%08x\n", 1225 ncp->nc_name, 1226 (long long)obj_id, (long long)asof, 1227 localization); 1228 error = 0; 1229 ip = hammer_get_dummy_inode(&trans, dip, obj_id, 1230 asof, localization, 1231 flags, &error); 1232 } 1233 if (error == 0) { 1234 error = hammer_get_vnode(ip, &vp); 1235 hammer_rel_inode(ip, 0); 1236 } else { 1237 vp = NULL; 1238 } 1239 if (error == 0) { 1240 vn_unlock(vp); 1241 cache_setvp(ap->a_nch, vp); 1242 vrele(vp); 1243 } 1244 } else if (error == ENOENT) { 1245 cache_setvp(ap->a_nch, NULL); 1246 } 1247 done: 1248 hammer_done_transaction(&trans); 1249 return (error); 1250 } 1251 1252 /* 1253 * hammer_vop_nlookupdotdot { dvp, vpp, cred } 1254 * 1255 * Locate the parent directory of a directory vnode. 1256 * 1257 * dvp is referenced but not locked. *vpp must be returned referenced and 1258 * locked. A parent_obj_id of 0 does not necessarily indicate that we are 1259 * at the root, instead it could indicate that the directory we were in was 1260 * removed. 1261 * 1262 * NOTE: as-of sequences are not linked into the directory structure. If 1263 * we are at the root with a different asof then the mount point, reload 1264 * the same directory with the mount point's asof. I'm not sure what this 1265 * will do to NFS. We encode ASOF stamps in NFS file handles so it might not 1266 * get confused, but it hasn't been tested. 1267 */ 1268 static 1269 int 1270 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap) 1271 { 1272 struct hammer_transaction trans; 1273 struct hammer_inode *dip; 1274 struct hammer_inode *ip; 1275 int64_t parent_obj_id; 1276 u_int32_t parent_obj_localization; 1277 hammer_tid_t asof; 1278 int error; 1279 1280 dip = VTOI(ap->a_dvp); 1281 asof = dip->obj_asof; 1282 1283 /* 1284 * Whos are parent? This could be the root of a pseudo-filesystem 1285 * whos parent is in another localization domain. 1286 */ 1287 parent_obj_id = dip->ino_data.parent_obj_id; 1288 if (dip->obj_id == HAMMER_OBJID_ROOT) 1289 parent_obj_localization = dip->ino_data.ext.obj.parent_obj_localization; 1290 else 1291 parent_obj_localization = dip->obj_localization; 1292 1293 if (parent_obj_id == 0) { 1294 if (dip->obj_id == HAMMER_OBJID_ROOT && 1295 asof != dip->hmp->asof) { 1296 parent_obj_id = dip->obj_id; 1297 asof = dip->hmp->asof; 1298 *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK); 1299 ksnprintf(*ap->a_fakename, 19, "0x%016llx", 1300 (long long)dip->obj_asof); 1301 } else { 1302 *ap->a_vpp = NULL; 1303 return ENOENT; 1304 } 1305 } 1306 1307 hammer_simple_transaction(&trans, dip->hmp); 1308 ++hammer_stats_file_iopsr; 1309 1310 ip = hammer_get_inode(&trans, dip, parent_obj_id, 1311 asof, parent_obj_localization, 1312 dip->flags, &error); 1313 if (ip) { 1314 error = hammer_get_vnode(ip, ap->a_vpp); 1315 hammer_rel_inode(ip, 0); 1316 } else { 1317 *ap->a_vpp = NULL; 1318 } 1319 hammer_done_transaction(&trans); 1320 return (error); 1321 } 1322 1323 /* 1324 * hammer_vop_nlink { nch, dvp, vp, cred } 1325 */ 1326 static 1327 int 1328 hammer_vop_nlink(struct vop_nlink_args *ap) 1329 { 1330 struct hammer_transaction trans; 1331 struct hammer_inode *dip; 1332 struct hammer_inode *ip; 1333 struct nchandle *nch; 1334 int error; 1335 1336 if (ap->a_dvp->v_mount != ap->a_vp->v_mount) 1337 return(EXDEV); 1338 1339 nch = ap->a_nch; 1340 dip = VTOI(ap->a_dvp); 1341 ip = VTOI(ap->a_vp); 1342 1343 if (dip->obj_localization != ip->obj_localization) 1344 return(EXDEV); 1345 1346 if (dip->flags & HAMMER_INODE_RO) 1347 return (EROFS); 1348 if (ip->flags & HAMMER_INODE_RO) 1349 return (EROFS); 1350 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) 1351 return (error); 1352 1353 /* 1354 * Create a transaction to cover the operations we perform. 1355 */ 1356 hammer_start_transaction(&trans, dip->hmp); 1357 ++hammer_stats_file_iopsw; 1358 1359 /* 1360 * Add the filesystem object to the directory. Note that neither 1361 * dip nor ip are referenced or locked, but their vnodes are 1362 * referenced. This function will bump the inode's link count. 1363 */ 1364 error = hammer_ip_add_directory(&trans, dip, 1365 nch->ncp->nc_name, nch->ncp->nc_nlen, 1366 ip); 1367 1368 /* 1369 * Finish up. 1370 */ 1371 if (error == 0) { 1372 cache_setunresolved(nch); 1373 cache_setvp(nch, ap->a_vp); 1374 } 1375 hammer_done_transaction(&trans); 1376 hammer_knote(ap->a_vp, NOTE_LINK); 1377 hammer_knote(ap->a_dvp, NOTE_WRITE); 1378 return (error); 1379 } 1380 1381 /* 1382 * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap } 1383 * 1384 * The operating system has already ensured that the directory entry 1385 * does not exist and done all appropriate namespace locking. 1386 */ 1387 static 1388 int 1389 hammer_vop_nmkdir(struct vop_nmkdir_args *ap) 1390 { 1391 struct hammer_transaction trans; 1392 struct hammer_inode *dip; 1393 struct hammer_inode *nip; 1394 struct nchandle *nch; 1395 int error; 1396 1397 nch = ap->a_nch; 1398 dip = VTOI(ap->a_dvp); 1399 1400 if (dip->flags & HAMMER_INODE_RO) 1401 return (EROFS); 1402 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) 1403 return (error); 1404 1405 /* 1406 * Create a transaction to cover the operations we perform. 1407 */ 1408 hammer_start_transaction(&trans, dip->hmp); 1409 ++hammer_stats_file_iopsw; 1410 1411 /* 1412 * Create a new filesystem object of the requested type. The 1413 * returned inode will be referenced but not locked. 1414 */ 1415 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 1416 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 1417 NULL, &nip); 1418 if (error) { 1419 hkprintf("hammer_mkdir error %d\n", error); 1420 hammer_done_transaction(&trans); 1421 *ap->a_vpp = NULL; 1422 return (error); 1423 } 1424 /* 1425 * Add the new filesystem object to the directory. This will also 1426 * bump the inode's link count. 1427 */ 1428 error = hammer_ip_add_directory(&trans, dip, 1429 nch->ncp->nc_name, nch->ncp->nc_nlen, 1430 nip); 1431 if (error) 1432 hkprintf("hammer_mkdir (add) error %d\n", error); 1433 1434 /* 1435 * Finish up. 1436 */ 1437 if (error) { 1438 hammer_rel_inode(nip, 0); 1439 *ap->a_vpp = NULL; 1440 } else { 1441 error = hammer_get_vnode(nip, ap->a_vpp); 1442 hammer_rel_inode(nip, 0); 1443 if (error == 0) { 1444 cache_setunresolved(ap->a_nch); 1445 cache_setvp(ap->a_nch, *ap->a_vpp); 1446 } 1447 } 1448 hammer_done_transaction(&trans); 1449 if (error == 0) 1450 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1451 return (error); 1452 } 1453 1454 /* 1455 * hammer_vop_nmknod { nch, dvp, vpp, cred, vap } 1456 * 1457 * The operating system has already ensured that the directory entry 1458 * does not exist and done all appropriate namespace locking. 1459 */ 1460 static 1461 int 1462 hammer_vop_nmknod(struct vop_nmknod_args *ap) 1463 { 1464 struct hammer_transaction trans; 1465 struct hammer_inode *dip; 1466 struct hammer_inode *nip; 1467 struct nchandle *nch; 1468 int error; 1469 1470 nch = ap->a_nch; 1471 dip = VTOI(ap->a_dvp); 1472 1473 if (dip->flags & HAMMER_INODE_RO) 1474 return (EROFS); 1475 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) 1476 return (error); 1477 1478 /* 1479 * Create a transaction to cover the operations we perform. 1480 */ 1481 hammer_start_transaction(&trans, dip->hmp); 1482 ++hammer_stats_file_iopsw; 1483 1484 /* 1485 * Create a new filesystem object of the requested type. The 1486 * returned inode will be referenced but not locked. 1487 * 1488 * If mknod specifies a directory a pseudo-fs is created. 1489 */ 1490 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 1491 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 1492 NULL, &nip); 1493 if (error) { 1494 hammer_done_transaction(&trans); 1495 *ap->a_vpp = NULL; 1496 return (error); 1497 } 1498 1499 /* 1500 * Add the new filesystem object to the directory. This will also 1501 * bump the inode's link count. 1502 */ 1503 error = hammer_ip_add_directory(&trans, dip, 1504 nch->ncp->nc_name, nch->ncp->nc_nlen, 1505 nip); 1506 1507 /* 1508 * Finish up. 1509 */ 1510 if (error) { 1511 hammer_rel_inode(nip, 0); 1512 *ap->a_vpp = NULL; 1513 } else { 1514 error = hammer_get_vnode(nip, ap->a_vpp); 1515 hammer_rel_inode(nip, 0); 1516 if (error == 0) { 1517 cache_setunresolved(ap->a_nch); 1518 cache_setvp(ap->a_nch, *ap->a_vpp); 1519 } 1520 } 1521 hammer_done_transaction(&trans); 1522 if (error == 0) 1523 hammer_knote(ap->a_dvp, NOTE_WRITE); 1524 return (error); 1525 } 1526 1527 /* 1528 * hammer_vop_open { vp, mode, cred, fp } 1529 */ 1530 static 1531 int 1532 hammer_vop_open(struct vop_open_args *ap) 1533 { 1534 hammer_inode_t ip; 1535 1536 ++hammer_stats_file_iopsr; 1537 ip = VTOI(ap->a_vp); 1538 1539 if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO)) 1540 return (EROFS); 1541 return(vop_stdopen(ap)); 1542 } 1543 1544 /* 1545 * hammer_vop_print { vp } 1546 */ 1547 static 1548 int 1549 hammer_vop_print(struct vop_print_args *ap) 1550 { 1551 return EOPNOTSUPP; 1552 } 1553 1554 /* 1555 * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies } 1556 */ 1557 static 1558 int 1559 hammer_vop_readdir(struct vop_readdir_args *ap) 1560 { 1561 struct hammer_transaction trans; 1562 struct hammer_cursor cursor; 1563 struct hammer_inode *ip; 1564 struct uio *uio; 1565 hammer_base_elm_t base; 1566 int error; 1567 int cookie_index; 1568 int ncookies; 1569 off_t *cookies; 1570 off_t saveoff; 1571 int r; 1572 int dtype; 1573 1574 ++hammer_stats_file_iopsr; 1575 ip = VTOI(ap->a_vp); 1576 uio = ap->a_uio; 1577 saveoff = uio->uio_offset; 1578 1579 if (ap->a_ncookies) { 1580 ncookies = uio->uio_resid / 16 + 1; 1581 if (ncookies > 1024) 1582 ncookies = 1024; 1583 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 1584 cookie_index = 0; 1585 } else { 1586 ncookies = -1; 1587 cookies = NULL; 1588 cookie_index = 0; 1589 } 1590 1591 hammer_simple_transaction(&trans, ip->hmp); 1592 1593 /* 1594 * Handle artificial entries 1595 * 1596 * It should be noted that the minimum value for a directory 1597 * hash key on-media is 0x0000000100000000, so we can use anything 1598 * less then that to represent our 'special' key space. 1599 */ 1600 error = 0; 1601 if (saveoff == 0) { 1602 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, "."); 1603 if (r) 1604 goto done; 1605 if (cookies) 1606 cookies[cookie_index] = saveoff; 1607 ++saveoff; 1608 ++cookie_index; 1609 if (cookie_index == ncookies) 1610 goto done; 1611 } 1612 if (saveoff == 1) { 1613 if (ip->ino_data.parent_obj_id) { 1614 r = vop_write_dirent(&error, uio, 1615 ip->ino_data.parent_obj_id, 1616 DT_DIR, 2, ".."); 1617 } else { 1618 r = vop_write_dirent(&error, uio, 1619 ip->obj_id, DT_DIR, 2, ".."); 1620 } 1621 if (r) 1622 goto done; 1623 if (cookies) 1624 cookies[cookie_index] = saveoff; 1625 ++saveoff; 1626 ++cookie_index; 1627 if (cookie_index == ncookies) 1628 goto done; 1629 } 1630 1631 /* 1632 * Key range (begin and end inclusive) to scan. Directory keys 1633 * directly translate to a 64 bit 'seek' position. 1634 */ 1635 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 1636 cursor.key_beg.localization = ip->obj_localization + 1637 hammer_dir_localization(ip); 1638 cursor.key_beg.obj_id = ip->obj_id; 1639 cursor.key_beg.create_tid = 0; 1640 cursor.key_beg.delete_tid = 0; 1641 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 1642 cursor.key_beg.obj_type = 0; 1643 cursor.key_beg.key = saveoff; 1644 1645 cursor.key_end = cursor.key_beg; 1646 cursor.key_end.key = HAMMER_MAX_KEY; 1647 cursor.asof = ip->obj_asof; 1648 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 1649 1650 error = hammer_ip_first(&cursor); 1651 1652 while (error == 0) { 1653 error = hammer_ip_resolve_data(&cursor); 1654 if (error) 1655 break; 1656 base = &cursor.leaf->base; 1657 saveoff = base->key; 1658 KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF); 1659 1660 if (base->obj_id != ip->obj_id) 1661 panic("readdir: bad record at %p", cursor.node); 1662 1663 /* 1664 * Convert pseudo-filesystems into softlinks 1665 */ 1666 dtype = hammer_get_dtype(cursor.leaf->base.obj_type); 1667 r = vop_write_dirent( 1668 &error, uio, cursor.data->entry.obj_id, 1669 dtype, 1670 cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF , 1671 (void *)cursor.data->entry.name); 1672 if (r) 1673 break; 1674 ++saveoff; 1675 if (cookies) 1676 cookies[cookie_index] = base->key; 1677 ++cookie_index; 1678 if (cookie_index == ncookies) 1679 break; 1680 error = hammer_ip_next(&cursor); 1681 } 1682 hammer_done_cursor(&cursor); 1683 1684 done: 1685 hammer_done_transaction(&trans); 1686 1687 if (ap->a_eofflag) 1688 *ap->a_eofflag = (error == ENOENT); 1689 uio->uio_offset = saveoff; 1690 if (error && cookie_index == 0) { 1691 if (error == ENOENT) 1692 error = 0; 1693 if (cookies) { 1694 kfree(cookies, M_TEMP); 1695 *ap->a_ncookies = 0; 1696 *ap->a_cookies = NULL; 1697 } 1698 } else { 1699 if (error == ENOENT) 1700 error = 0; 1701 if (cookies) { 1702 *ap->a_ncookies = cookie_index; 1703 *ap->a_cookies = cookies; 1704 } 1705 } 1706 return(error); 1707 } 1708 1709 /* 1710 * hammer_vop_readlink { vp, uio, cred } 1711 */ 1712 static 1713 int 1714 hammer_vop_readlink(struct vop_readlink_args *ap) 1715 { 1716 struct hammer_transaction trans; 1717 struct hammer_cursor cursor; 1718 struct hammer_inode *ip; 1719 char buf[32]; 1720 u_int32_t localization; 1721 hammer_pseudofs_inmem_t pfsm; 1722 int error; 1723 1724 ip = VTOI(ap->a_vp); 1725 1726 /* 1727 * Shortcut if the symlink data was stuffed into ino_data. 1728 * 1729 * Also expand special "@@PFS%05d" softlinks (expansion only 1730 * occurs for non-historical (current) accesses made from the 1731 * primary filesystem). 1732 */ 1733 if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) { 1734 char *ptr; 1735 int bytes; 1736 1737 ptr = ip->ino_data.ext.symlink; 1738 bytes = (int)ip->ino_data.size; 1739 if (bytes == 10 && 1740 ip->obj_asof == HAMMER_MAX_TID && 1741 ip->obj_localization == 0 && 1742 strncmp(ptr, "@@PFS", 5) == 0) { 1743 hammer_simple_transaction(&trans, ip->hmp); 1744 bcopy(ptr + 5, buf, 5); 1745 buf[5] = 0; 1746 localization = strtoul(buf, NULL, 10) << 16; 1747 pfsm = hammer_load_pseudofs(&trans, localization, 1748 &error); 1749 if (error == 0) { 1750 if (pfsm->pfsd.mirror_flags & 1751 HAMMER_PFSD_SLAVE) { 1752 /* vap->va_size == 26 */ 1753 ksnprintf(buf, sizeof(buf), 1754 "@@0x%016llx:%05d", 1755 (long long)pfsm->pfsd.sync_end_tid, 1756 localization >> 16); 1757 } else { 1758 /* vap->va_size == 10 */ 1759 ksnprintf(buf, sizeof(buf), 1760 "@@-1:%05d", 1761 localization >> 16); 1762 #if 0 1763 ksnprintf(buf, sizeof(buf), 1764 "@@0x%016llx:%05d", 1765 (long long)HAMMER_MAX_TID, 1766 localization >> 16); 1767 #endif 1768 } 1769 ptr = buf; 1770 bytes = strlen(buf); 1771 } 1772 if (pfsm) 1773 hammer_rel_pseudofs(trans.hmp, pfsm); 1774 hammer_done_transaction(&trans); 1775 } 1776 error = uiomove(ptr, bytes, ap->a_uio); 1777 return(error); 1778 } 1779 1780 /* 1781 * Long version 1782 */ 1783 hammer_simple_transaction(&trans, ip->hmp); 1784 ++hammer_stats_file_iopsr; 1785 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 1786 1787 /* 1788 * Key range (begin and end inclusive) to scan. Directory keys 1789 * directly translate to a 64 bit 'seek' position. 1790 */ 1791 cursor.key_beg.localization = ip->obj_localization + 1792 HAMMER_LOCALIZE_MISC; 1793 cursor.key_beg.obj_id = ip->obj_id; 1794 cursor.key_beg.create_tid = 0; 1795 cursor.key_beg.delete_tid = 0; 1796 cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX; 1797 cursor.key_beg.obj_type = 0; 1798 cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK; 1799 cursor.asof = ip->obj_asof; 1800 cursor.flags |= HAMMER_CURSOR_ASOF; 1801 1802 error = hammer_ip_lookup(&cursor); 1803 if (error == 0) { 1804 error = hammer_ip_resolve_data(&cursor); 1805 if (error == 0) { 1806 KKASSERT(cursor.leaf->data_len >= 1807 HAMMER_SYMLINK_NAME_OFF); 1808 error = uiomove(cursor.data->symlink.name, 1809 cursor.leaf->data_len - 1810 HAMMER_SYMLINK_NAME_OFF, 1811 ap->a_uio); 1812 } 1813 } 1814 hammer_done_cursor(&cursor); 1815 hammer_done_transaction(&trans); 1816 return(error); 1817 } 1818 1819 /* 1820 * hammer_vop_nremove { nch, dvp, cred } 1821 */ 1822 static 1823 int 1824 hammer_vop_nremove(struct vop_nremove_args *ap) 1825 { 1826 struct hammer_transaction trans; 1827 struct hammer_inode *dip; 1828 int error; 1829 1830 dip = VTOI(ap->a_dvp); 1831 1832 if (hammer_nohistory(dip) == 0 && 1833 (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 1834 return (error); 1835 } 1836 1837 hammer_start_transaction(&trans, dip->hmp); 1838 ++hammer_stats_file_iopsw; 1839 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 0); 1840 hammer_done_transaction(&trans); 1841 if (error == 0) 1842 hammer_knote(ap->a_dvp, NOTE_WRITE); 1843 return (error); 1844 } 1845 1846 /* 1847 * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred } 1848 */ 1849 static 1850 int 1851 hammer_vop_nrename(struct vop_nrename_args *ap) 1852 { 1853 struct hammer_transaction trans; 1854 struct namecache *fncp; 1855 struct namecache *tncp; 1856 struct hammer_inode *fdip; 1857 struct hammer_inode *tdip; 1858 struct hammer_inode *ip; 1859 struct hammer_cursor cursor; 1860 int64_t namekey; 1861 u_int32_t max_iterations; 1862 int nlen, error; 1863 1864 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount) 1865 return(EXDEV); 1866 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount) 1867 return(EXDEV); 1868 1869 fdip = VTOI(ap->a_fdvp); 1870 tdip = VTOI(ap->a_tdvp); 1871 fncp = ap->a_fnch->ncp; 1872 tncp = ap->a_tnch->ncp; 1873 ip = VTOI(fncp->nc_vp); 1874 KKASSERT(ip != NULL); 1875 1876 if (fdip->obj_localization != tdip->obj_localization) 1877 return(EXDEV); 1878 if (fdip->obj_localization != ip->obj_localization) 1879 return(EXDEV); 1880 1881 if (fdip->flags & HAMMER_INODE_RO) 1882 return (EROFS); 1883 if (tdip->flags & HAMMER_INODE_RO) 1884 return (EROFS); 1885 if (ip->flags & HAMMER_INODE_RO) 1886 return (EROFS); 1887 if ((error = hammer_checkspace(fdip->hmp, HAMMER_CHKSPC_CREATE)) != 0) 1888 return (error); 1889 1890 hammer_start_transaction(&trans, fdip->hmp); 1891 ++hammer_stats_file_iopsw; 1892 1893 /* 1894 * Remove tncp from the target directory and then link ip as 1895 * tncp. XXX pass trans to dounlink 1896 * 1897 * Force the inode sync-time to match the transaction so it is 1898 * in-sync with the creation of the target directory entry. 1899 */ 1900 error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp, 1901 ap->a_cred, 0, -1); 1902 if (error == 0 || error == ENOENT) { 1903 error = hammer_ip_add_directory(&trans, tdip, 1904 tncp->nc_name, tncp->nc_nlen, 1905 ip); 1906 if (error == 0) { 1907 ip->ino_data.parent_obj_id = tdip->obj_id; 1908 ip->ino_data.ctime = trans.time; 1909 hammer_modify_inode(&trans, ip, HAMMER_INODE_DDIRTY); 1910 } 1911 } 1912 if (error) 1913 goto failed; /* XXX */ 1914 1915 /* 1916 * Locate the record in the originating directory and remove it. 1917 * 1918 * Calculate the namekey and setup the key range for the scan. This 1919 * works kinda like a chained hash table where the lower 32 bits 1920 * of the namekey synthesize the chain. 1921 * 1922 * The key range is inclusive of both key_beg and key_end. 1923 */ 1924 namekey = hammer_directory_namekey(fdip, fncp->nc_name, fncp->nc_nlen, 1925 &max_iterations); 1926 retry: 1927 hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip); 1928 cursor.key_beg.localization = fdip->obj_localization + 1929 hammer_dir_localization(fdip); 1930 cursor.key_beg.obj_id = fdip->obj_id; 1931 cursor.key_beg.key = namekey; 1932 cursor.key_beg.create_tid = 0; 1933 cursor.key_beg.delete_tid = 0; 1934 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 1935 cursor.key_beg.obj_type = 0; 1936 1937 cursor.key_end = cursor.key_beg; 1938 cursor.key_end.key += max_iterations; 1939 cursor.asof = fdip->obj_asof; 1940 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 1941 1942 /* 1943 * Scan all matching records (the chain), locate the one matching 1944 * the requested path component. 1945 * 1946 * The hammer_ip_*() functions merge in-memory records with on-disk 1947 * records for the purposes of the search. 1948 */ 1949 error = hammer_ip_first(&cursor); 1950 while (error == 0) { 1951 if (hammer_ip_resolve_data(&cursor) != 0) 1952 break; 1953 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF; 1954 KKASSERT(nlen > 0); 1955 if (fncp->nc_nlen == nlen && 1956 bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) { 1957 break; 1958 } 1959 error = hammer_ip_next(&cursor); 1960 } 1961 1962 /* 1963 * If all is ok we have to get the inode so we can adjust nlinks. 1964 * 1965 * WARNING: hammer_ip_del_directory() may have to terminate the 1966 * cursor to avoid a recursion. It's ok to call hammer_done_cursor() 1967 * twice. 1968 */ 1969 if (error == 0) 1970 error = hammer_ip_del_directory(&trans, &cursor, fdip, ip); 1971 1972 /* 1973 * XXX A deadlock here will break rename's atomicy for the purposes 1974 * of crash recovery. 1975 */ 1976 if (error == EDEADLK) { 1977 hammer_done_cursor(&cursor); 1978 goto retry; 1979 } 1980 1981 /* 1982 * Cleanup and tell the kernel that the rename succeeded. 1983 */ 1984 hammer_done_cursor(&cursor); 1985 if (error == 0) { 1986 cache_rename(ap->a_fnch, ap->a_tnch); 1987 hammer_knote(ap->a_fdvp, NOTE_WRITE); 1988 hammer_knote(ap->a_tdvp, NOTE_WRITE); 1989 if (ip->vp) 1990 hammer_knote(ip->vp, NOTE_RENAME); 1991 } 1992 1993 failed: 1994 hammer_done_transaction(&trans); 1995 return (error); 1996 } 1997 1998 /* 1999 * hammer_vop_nrmdir { nch, dvp, cred } 2000 */ 2001 static 2002 int 2003 hammer_vop_nrmdir(struct vop_nrmdir_args *ap) 2004 { 2005 struct hammer_transaction trans; 2006 struct hammer_inode *dip; 2007 int error; 2008 2009 dip = VTOI(ap->a_dvp); 2010 2011 if (hammer_nohistory(dip) == 0 && 2012 (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 2013 return (error); 2014 } 2015 2016 hammer_start_transaction(&trans, dip->hmp); 2017 ++hammer_stats_file_iopsw; 2018 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 1); 2019 hammer_done_transaction(&trans); 2020 if (error == 0) 2021 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 2022 return (error); 2023 } 2024 2025 /* 2026 * hammer_vop_markatime { vp, cred } 2027 */ 2028 static 2029 int 2030 hammer_vop_markatime(struct vop_markatime_args *ap) 2031 { 2032 struct hammer_transaction trans; 2033 struct hammer_inode *ip; 2034 2035 ip = VTOI(ap->a_vp); 2036 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 2037 return (EROFS); 2038 if (ip->flags & HAMMER_INODE_RO) 2039 return (EROFS); 2040 if (ip->hmp->mp->mnt_flag & MNT_NOATIME) 2041 return (0); 2042 hammer_start_transaction(&trans, ip->hmp); 2043 ++hammer_stats_file_iopsw; 2044 2045 ip->ino_data.atime = trans.time; 2046 hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME); 2047 hammer_done_transaction(&trans); 2048 hammer_knote(ap->a_vp, NOTE_ATTRIB); 2049 return (0); 2050 } 2051 2052 /* 2053 * hammer_vop_setattr { vp, vap, cred } 2054 */ 2055 static 2056 int 2057 hammer_vop_setattr(struct vop_setattr_args *ap) 2058 { 2059 struct hammer_transaction trans; 2060 struct vattr *vap; 2061 struct hammer_inode *ip; 2062 int modflags; 2063 int error; 2064 int truncating; 2065 int blksize; 2066 int kflags; 2067 #if 0 2068 int64_t aligned_size; 2069 #endif 2070 u_int32_t flags; 2071 2072 vap = ap->a_vap; 2073 ip = ap->a_vp->v_data; 2074 modflags = 0; 2075 kflags = 0; 2076 2077 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 2078 return(EROFS); 2079 if (ip->flags & HAMMER_INODE_RO) 2080 return (EROFS); 2081 if (hammer_nohistory(ip) == 0 && 2082 (error = hammer_checkspace(ip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 2083 return (error); 2084 } 2085 2086 hammer_start_transaction(&trans, ip->hmp); 2087 ++hammer_stats_file_iopsw; 2088 error = 0; 2089 2090 if (vap->va_flags != VNOVAL) { 2091 flags = ip->ino_data.uflags; 2092 error = vop_helper_setattr_flags(&flags, vap->va_flags, 2093 hammer_to_unix_xid(&ip->ino_data.uid), 2094 ap->a_cred); 2095 if (error == 0) { 2096 if (ip->ino_data.uflags != flags) { 2097 ip->ino_data.uflags = flags; 2098 ip->ino_data.ctime = trans.time; 2099 modflags |= HAMMER_INODE_DDIRTY; 2100 kflags |= NOTE_ATTRIB; 2101 } 2102 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) { 2103 error = 0; 2104 goto done; 2105 } 2106 } 2107 goto done; 2108 } 2109 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) { 2110 error = EPERM; 2111 goto done; 2112 } 2113 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 2114 mode_t cur_mode = ip->ino_data.mode; 2115 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid); 2116 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid); 2117 uuid_t uuid_uid; 2118 uuid_t uuid_gid; 2119 2120 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid, 2121 ap->a_cred, 2122 &cur_uid, &cur_gid, &cur_mode); 2123 if (error == 0) { 2124 hammer_guid_to_uuid(&uuid_uid, cur_uid); 2125 hammer_guid_to_uuid(&uuid_gid, cur_gid); 2126 if (bcmp(&uuid_uid, &ip->ino_data.uid, 2127 sizeof(uuid_uid)) || 2128 bcmp(&uuid_gid, &ip->ino_data.gid, 2129 sizeof(uuid_gid)) || 2130 ip->ino_data.mode != cur_mode 2131 ) { 2132 ip->ino_data.uid = uuid_uid; 2133 ip->ino_data.gid = uuid_gid; 2134 ip->ino_data.mode = cur_mode; 2135 ip->ino_data.ctime = trans.time; 2136 modflags |= HAMMER_INODE_DDIRTY; 2137 } 2138 kflags |= NOTE_ATTRIB; 2139 } 2140 } 2141 while (vap->va_size != VNOVAL && ip->ino_data.size != vap->va_size) { 2142 switch(ap->a_vp->v_type) { 2143 case VREG: 2144 if (vap->va_size == ip->ino_data.size) 2145 break; 2146 2147 /* 2148 * Log the operation if in fast-fsync mode or if 2149 * there are unterminated redo write records present. 2150 * 2151 * The second check is needed so the recovery code 2152 * properly truncates write redos even if nominal 2153 * REDO operations is turned off due to excessive 2154 * writes, because the related records might be 2155 * destroyed and never lay down a TERM_WRITE. 2156 */ 2157 if ((ip->flags & HAMMER_INODE_REDO) || 2158 (ip->flags & HAMMER_INODE_RDIRTY)) { 2159 error = hammer_generate_redo(&trans, ip, 2160 vap->va_size, 2161 HAMMER_REDO_TRUNC, 2162 NULL, 0); 2163 } 2164 blksize = hammer_blocksize(vap->va_size); 2165 2166 /* 2167 * XXX break atomicy, we can deadlock the backend 2168 * if we do not release the lock. Probably not a 2169 * big deal here. 2170 */ 2171 if (vap->va_size < ip->ino_data.size) { 2172 nvtruncbuf(ap->a_vp, vap->va_size, 2173 blksize, 2174 hammer_blockoff(vap->va_size)); 2175 truncating = 1; 2176 kflags |= NOTE_WRITE; 2177 } else { 2178 nvextendbuf(ap->a_vp, 2179 ip->ino_data.size, 2180 vap->va_size, 2181 hammer_blocksize(ip->ino_data.size), 2182 hammer_blocksize(vap->va_size), 2183 hammer_blockoff(ip->ino_data.size), 2184 hammer_blockoff(vap->va_size), 2185 0); 2186 truncating = 0; 2187 kflags |= NOTE_WRITE | NOTE_EXTEND; 2188 } 2189 ip->ino_data.size = vap->va_size; 2190 ip->ino_data.mtime = trans.time; 2191 /* XXX safe to use SDIRTY instead of DDIRTY here? */ 2192 modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY; 2193 2194 /* 2195 * On-media truncation is cached in the inode until 2196 * the inode is synchronized. We must immediately 2197 * handle any frontend records. 2198 */ 2199 if (truncating) { 2200 hammer_ip_frontend_trunc(ip, vap->va_size); 2201 #ifdef DEBUG_TRUNCATE 2202 if (HammerTruncIp == NULL) 2203 HammerTruncIp = ip; 2204 #endif 2205 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) { 2206 ip->flags |= HAMMER_INODE_TRUNCATED; 2207 ip->trunc_off = vap->va_size; 2208 #ifdef DEBUG_TRUNCATE 2209 if (ip == HammerTruncIp) 2210 kprintf("truncate1 %016llx\n", 2211 (long long)ip->trunc_off); 2212 #endif 2213 } else if (ip->trunc_off > vap->va_size) { 2214 ip->trunc_off = vap->va_size; 2215 #ifdef DEBUG_TRUNCATE 2216 if (ip == HammerTruncIp) 2217 kprintf("truncate2 %016llx\n", 2218 (long long)ip->trunc_off); 2219 #endif 2220 } else { 2221 #ifdef DEBUG_TRUNCATE 2222 if (ip == HammerTruncIp) 2223 kprintf("truncate3 %016llx (ignored)\n", 2224 (long long)vap->va_size); 2225 #endif 2226 } 2227 } 2228 2229 #if 0 2230 /* 2231 * When truncating, nvtruncbuf() may have cleaned out 2232 * a portion of the last block on-disk in the buffer 2233 * cache. We must clean out any frontend records 2234 * for blocks beyond the new last block. 2235 */ 2236 aligned_size = (vap->va_size + (blksize - 1)) & 2237 ~(int64_t)(blksize - 1); 2238 if (truncating && vap->va_size < aligned_size) { 2239 aligned_size -= blksize; 2240 hammer_ip_frontend_trunc(ip, aligned_size); 2241 } 2242 #endif 2243 break; 2244 case VDATABASE: 2245 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) { 2246 ip->flags |= HAMMER_INODE_TRUNCATED; 2247 ip->trunc_off = vap->va_size; 2248 } else if (ip->trunc_off > vap->va_size) { 2249 ip->trunc_off = vap->va_size; 2250 } 2251 hammer_ip_frontend_trunc(ip, vap->va_size); 2252 ip->ino_data.size = vap->va_size; 2253 ip->ino_data.mtime = trans.time; 2254 modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY; 2255 kflags |= NOTE_ATTRIB; 2256 break; 2257 default: 2258 error = EINVAL; 2259 goto done; 2260 } 2261 break; 2262 } 2263 if (vap->va_atime.tv_sec != VNOVAL) { 2264 ip->ino_data.atime = hammer_timespec_to_time(&vap->va_atime); 2265 modflags |= HAMMER_INODE_ATIME; 2266 kflags |= NOTE_ATTRIB; 2267 } 2268 if (vap->va_mtime.tv_sec != VNOVAL) { 2269 ip->ino_data.mtime = hammer_timespec_to_time(&vap->va_mtime); 2270 modflags |= HAMMER_INODE_MTIME; 2271 kflags |= NOTE_ATTRIB; 2272 } 2273 if (vap->va_mode != (mode_t)VNOVAL) { 2274 mode_t cur_mode = ip->ino_data.mode; 2275 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid); 2276 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid); 2277 2278 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred, 2279 cur_uid, cur_gid, &cur_mode); 2280 if (error == 0 && ip->ino_data.mode != cur_mode) { 2281 ip->ino_data.mode = cur_mode; 2282 ip->ino_data.ctime = trans.time; 2283 modflags |= HAMMER_INODE_DDIRTY; 2284 kflags |= NOTE_ATTRIB; 2285 } 2286 } 2287 done: 2288 if (error == 0) 2289 hammer_modify_inode(&trans, ip, modflags); 2290 hammer_done_transaction(&trans); 2291 hammer_knote(ap->a_vp, kflags); 2292 return (error); 2293 } 2294 2295 /* 2296 * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target } 2297 */ 2298 static 2299 int 2300 hammer_vop_nsymlink(struct vop_nsymlink_args *ap) 2301 { 2302 struct hammer_transaction trans; 2303 struct hammer_inode *dip; 2304 struct hammer_inode *nip; 2305 struct nchandle *nch; 2306 hammer_record_t record; 2307 int error; 2308 int bytes; 2309 2310 ap->a_vap->va_type = VLNK; 2311 2312 nch = ap->a_nch; 2313 dip = VTOI(ap->a_dvp); 2314 2315 if (dip->flags & HAMMER_INODE_RO) 2316 return (EROFS); 2317 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) 2318 return (error); 2319 2320 /* 2321 * Create a transaction to cover the operations we perform. 2322 */ 2323 hammer_start_transaction(&trans, dip->hmp); 2324 ++hammer_stats_file_iopsw; 2325 2326 /* 2327 * Create a new filesystem object of the requested type. The 2328 * returned inode will be referenced but not locked. 2329 */ 2330 2331 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 2332 dip, nch->ncp->nc_name, nch->ncp->nc_nlen, 2333 NULL, &nip); 2334 if (error) { 2335 hammer_done_transaction(&trans); 2336 *ap->a_vpp = NULL; 2337 return (error); 2338 } 2339 2340 /* 2341 * Add a record representing the symlink. symlink stores the link 2342 * as pure data, not a string, and is no \0 terminated. 2343 */ 2344 if (error == 0) { 2345 bytes = strlen(ap->a_target); 2346 2347 if (bytes <= HAMMER_INODE_BASESYMLEN) { 2348 bcopy(ap->a_target, nip->ino_data.ext.symlink, bytes); 2349 } else { 2350 record = hammer_alloc_mem_record(nip, bytes); 2351 record->type = HAMMER_MEM_RECORD_GENERAL; 2352 2353 record->leaf.base.localization = nip->obj_localization + 2354 HAMMER_LOCALIZE_MISC; 2355 record->leaf.base.key = HAMMER_FIXKEY_SYMLINK; 2356 record->leaf.base.rec_type = HAMMER_RECTYPE_FIX; 2357 record->leaf.data_len = bytes; 2358 KKASSERT(HAMMER_SYMLINK_NAME_OFF == 0); 2359 bcopy(ap->a_target, record->data->symlink.name, bytes); 2360 error = hammer_ip_add_record(&trans, record); 2361 } 2362 2363 /* 2364 * Set the file size to the length of the link. 2365 */ 2366 if (error == 0) { 2367 nip->ino_data.size = bytes; 2368 hammer_modify_inode(&trans, nip, HAMMER_INODE_DDIRTY); 2369 } 2370 } 2371 if (error == 0) 2372 error = hammer_ip_add_directory(&trans, dip, nch->ncp->nc_name, 2373 nch->ncp->nc_nlen, nip); 2374 2375 /* 2376 * Finish up. 2377 */ 2378 if (error) { 2379 hammer_rel_inode(nip, 0); 2380 *ap->a_vpp = NULL; 2381 } else { 2382 error = hammer_get_vnode(nip, ap->a_vpp); 2383 hammer_rel_inode(nip, 0); 2384 if (error == 0) { 2385 cache_setunresolved(ap->a_nch); 2386 cache_setvp(ap->a_nch, *ap->a_vpp); 2387 hammer_knote(ap->a_dvp, NOTE_WRITE); 2388 } 2389 } 2390 hammer_done_transaction(&trans); 2391 return (error); 2392 } 2393 2394 /* 2395 * hammer_vop_nwhiteout { nch, dvp, cred, flags } 2396 */ 2397 static 2398 int 2399 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap) 2400 { 2401 struct hammer_transaction trans; 2402 struct hammer_inode *dip; 2403 int error; 2404 2405 dip = VTOI(ap->a_dvp); 2406 2407 if (hammer_nohistory(dip) == 0 && 2408 (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) { 2409 return (error); 2410 } 2411 2412 hammer_start_transaction(&trans, dip->hmp); 2413 ++hammer_stats_file_iopsw; 2414 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, 2415 ap->a_cred, ap->a_flags, -1); 2416 hammer_done_transaction(&trans); 2417 2418 return (error); 2419 } 2420 2421 /* 2422 * hammer_vop_ioctl { vp, command, data, fflag, cred } 2423 */ 2424 static 2425 int 2426 hammer_vop_ioctl(struct vop_ioctl_args *ap) 2427 { 2428 struct hammer_inode *ip = ap->a_vp->v_data; 2429 2430 ++hammer_stats_file_iopsr; 2431 return(hammer_ioctl(ip, ap->a_command, ap->a_data, 2432 ap->a_fflag, ap->a_cred)); 2433 } 2434 2435 static 2436 int 2437 hammer_vop_mountctl(struct vop_mountctl_args *ap) 2438 { 2439 static const struct mountctl_opt extraopt[] = { 2440 { HMNT_NOHISTORY, "nohistory" }, 2441 { HMNT_MASTERID, "master" }, 2442 { 0, NULL} 2443 2444 }; 2445 struct hammer_mount *hmp; 2446 struct mount *mp; 2447 int usedbytes; 2448 int error; 2449 2450 error = 0; 2451 usedbytes = 0; 2452 mp = ap->a_head.a_ops->head.vv_mount; 2453 KKASSERT(mp->mnt_data != NULL); 2454 hmp = (struct hammer_mount *)mp->mnt_data; 2455 2456 switch(ap->a_op) { 2457 2458 case MOUNTCTL_SET_EXPORT: 2459 if (ap->a_ctllen != sizeof(struct export_args)) 2460 error = EINVAL; 2461 else 2462 error = hammer_vfs_export(mp, ap->a_op, 2463 (const struct export_args *)ap->a_ctl); 2464 break; 2465 case MOUNTCTL_MOUNTFLAGS: 2466 { 2467 /* 2468 * Call standard mountctl VOP function 2469 * so we get user mount flags. 2470 */ 2471 error = vop_stdmountctl(ap); 2472 if (error) 2473 break; 2474 2475 usedbytes = *ap->a_res; 2476 2477 if (usedbytes > 0 && usedbytes < ap->a_buflen) { 2478 usedbytes += vfs_flagstostr(hmp->hflags, extraopt, ap->a_buf, 2479 ap->a_buflen - usedbytes, 2480 &error); 2481 } 2482 2483 *ap->a_res += usedbytes; 2484 break; 2485 } 2486 default: 2487 error = vop_stdmountctl(ap); 2488 break; 2489 } 2490 return(error); 2491 } 2492 2493 /* 2494 * hammer_vop_strategy { vp, bio } 2495 * 2496 * Strategy call, used for regular file read & write only. Note that the 2497 * bp may represent a cluster. 2498 * 2499 * To simplify operation and allow better optimizations in the future, 2500 * this code does not make any assumptions with regards to buffer alignment 2501 * or size. 2502 */ 2503 static 2504 int 2505 hammer_vop_strategy(struct vop_strategy_args *ap) 2506 { 2507 struct buf *bp; 2508 int error; 2509 2510 bp = ap->a_bio->bio_buf; 2511 2512 switch(bp->b_cmd) { 2513 case BUF_CMD_READ: 2514 error = hammer_vop_strategy_read(ap); 2515 break; 2516 case BUF_CMD_WRITE: 2517 error = hammer_vop_strategy_write(ap); 2518 break; 2519 default: 2520 bp->b_error = error = EINVAL; 2521 bp->b_flags |= B_ERROR; 2522 biodone(ap->a_bio); 2523 break; 2524 } 2525 return (error); 2526 } 2527 2528 /* 2529 * Read from a regular file. Iterate the related records and fill in the 2530 * BIO/BUF. Gaps are zero-filled. 2531 * 2532 * The support code in hammer_object.c should be used to deal with mixed 2533 * in-memory and on-disk records. 2534 * 2535 * NOTE: Can be called from the cluster code with an oversized buf. 2536 * 2537 * XXX atime update 2538 */ 2539 static 2540 int 2541 hammer_vop_strategy_read(struct vop_strategy_args *ap) 2542 { 2543 struct hammer_transaction trans; 2544 struct hammer_inode *ip; 2545 struct hammer_inode *dip; 2546 struct hammer_cursor cursor; 2547 hammer_base_elm_t base; 2548 hammer_off_t disk_offset; 2549 struct bio *bio; 2550 struct bio *nbio; 2551 struct buf *bp; 2552 int64_t rec_offset; 2553 int64_t ran_end; 2554 int64_t tmp64; 2555 int error; 2556 int boff; 2557 int roff; 2558 int n; 2559 2560 bio = ap->a_bio; 2561 bp = bio->bio_buf; 2562 ip = ap->a_vp->v_data; 2563 2564 /* 2565 * The zone-2 disk offset may have been set by the cluster code via 2566 * a BMAP operation, or else should be NOOFFSET. 2567 * 2568 * Checking the high bits for a match against zone-2 should suffice. 2569 */ 2570 nbio = push_bio(bio); 2571 if ((nbio->bio_offset & HAMMER_OFF_ZONE_MASK) == 2572 HAMMER_ZONE_LARGE_DATA) { 2573 error = hammer_io_direct_read(ip->hmp, nbio, NULL); 2574 return (error); 2575 } 2576 2577 /* 2578 * Well, that sucked. Do it the hard way. If all the stars are 2579 * aligned we may still be able to issue a direct-read. 2580 */ 2581 hammer_simple_transaction(&trans, ip->hmp); 2582 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 2583 2584 /* 2585 * Key range (begin and end inclusive) to scan. Note that the key's 2586 * stored in the actual records represent BASE+LEN, not BASE. The 2587 * first record containing bio_offset will have a key > bio_offset. 2588 */ 2589 cursor.key_beg.localization = ip->obj_localization + 2590 HAMMER_LOCALIZE_MISC; 2591 cursor.key_beg.obj_id = ip->obj_id; 2592 cursor.key_beg.create_tid = 0; 2593 cursor.key_beg.delete_tid = 0; 2594 cursor.key_beg.obj_type = 0; 2595 cursor.key_beg.key = bio->bio_offset + 1; 2596 cursor.asof = ip->obj_asof; 2597 cursor.flags |= HAMMER_CURSOR_ASOF; 2598 2599 cursor.key_end = cursor.key_beg; 2600 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE); 2601 #if 0 2602 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) { 2603 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB; 2604 cursor.key_end.rec_type = HAMMER_RECTYPE_DB; 2605 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL; 2606 } else 2607 #endif 2608 { 2609 ran_end = bio->bio_offset + bp->b_bufsize; 2610 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA; 2611 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA; 2612 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */ 2613 if (tmp64 < ran_end) 2614 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL; 2615 else 2616 cursor.key_end.key = ran_end + MAXPHYS + 1; 2617 } 2618 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE; 2619 2620 error = hammer_ip_first(&cursor); 2621 boff = 0; 2622 2623 while (error == 0) { 2624 /* 2625 * Get the base file offset of the record. The key for 2626 * data records is (base + bytes) rather then (base). 2627 */ 2628 base = &cursor.leaf->base; 2629 rec_offset = base->key - cursor.leaf->data_len; 2630 2631 /* 2632 * Calculate the gap, if any, and zero-fill it. 2633 * 2634 * n is the offset of the start of the record verses our 2635 * current seek offset in the bio. 2636 */ 2637 n = (int)(rec_offset - (bio->bio_offset + boff)); 2638 if (n > 0) { 2639 if (n > bp->b_bufsize - boff) 2640 n = bp->b_bufsize - boff; 2641 bzero((char *)bp->b_data + boff, n); 2642 boff += n; 2643 n = 0; 2644 } 2645 2646 /* 2647 * Calculate the data offset in the record and the number 2648 * of bytes we can copy. 2649 * 2650 * There are two degenerate cases. First, boff may already 2651 * be at bp->b_bufsize. Secondly, the data offset within 2652 * the record may exceed the record's size. 2653 */ 2654 roff = -n; 2655 rec_offset += roff; 2656 n = cursor.leaf->data_len - roff; 2657 if (n <= 0) { 2658 kprintf("strategy_read: bad n=%d roff=%d\n", n, roff); 2659 n = 0; 2660 } else if (n > bp->b_bufsize - boff) { 2661 n = bp->b_bufsize - boff; 2662 } 2663 2664 /* 2665 * Deal with cached truncations. This cool bit of code 2666 * allows truncate()/ftruncate() to avoid having to sync 2667 * the file. 2668 * 2669 * If the frontend is truncated then all backend records are 2670 * subject to the frontend's truncation. 2671 * 2672 * If the backend is truncated then backend records on-disk 2673 * (but not in-memory) are subject to the backend's 2674 * truncation. In-memory records owned by the backend 2675 * represent data written after the truncation point on the 2676 * backend and must not be truncated. 2677 * 2678 * Truncate operations deal with frontend buffer cache 2679 * buffers and frontend-owned in-memory records synchronously. 2680 */ 2681 if (ip->flags & HAMMER_INODE_TRUNCATED) { 2682 if (hammer_cursor_ondisk(&cursor)/* || 2683 cursor.iprec->flush_state == HAMMER_FST_FLUSH*/) { 2684 if (ip->trunc_off <= rec_offset) 2685 n = 0; 2686 else if (ip->trunc_off < rec_offset + n) 2687 n = (int)(ip->trunc_off - rec_offset); 2688 } 2689 } 2690 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 2691 if (hammer_cursor_ondisk(&cursor)) { 2692 if (ip->sync_trunc_off <= rec_offset) 2693 n = 0; 2694 else if (ip->sync_trunc_off < rec_offset + n) 2695 n = (int)(ip->sync_trunc_off - rec_offset); 2696 } 2697 } 2698 2699 /* 2700 * Try to issue a direct read into our bio if possible, 2701 * otherwise resolve the element data into a hammer_buffer 2702 * and copy. 2703 * 2704 * The buffer on-disk should be zerod past any real 2705 * truncation point, but may not be for any synthesized 2706 * truncation point from above. 2707 */ 2708 disk_offset = cursor.leaf->data_offset + roff; 2709 if (boff == 0 && n == bp->b_bufsize && 2710 hammer_cursor_ondisk(&cursor) && 2711 (disk_offset & HAMMER_BUFMASK) == 0) { 2712 KKASSERT((disk_offset & HAMMER_OFF_ZONE_MASK) == 2713 HAMMER_ZONE_LARGE_DATA); 2714 nbio->bio_offset = disk_offset; 2715 error = hammer_io_direct_read(trans.hmp, nbio, 2716 cursor.leaf); 2717 goto done; 2718 } else if (n) { 2719 error = hammer_ip_resolve_data(&cursor); 2720 if (error == 0) { 2721 bcopy((char *)cursor.data + roff, 2722 (char *)bp->b_data + boff, n); 2723 } 2724 } 2725 if (error) 2726 break; 2727 2728 /* 2729 * Iterate until we have filled the request. 2730 */ 2731 boff += n; 2732 if (boff == bp->b_bufsize) 2733 break; 2734 error = hammer_ip_next(&cursor); 2735 } 2736 2737 /* 2738 * There may have been a gap after the last record 2739 */ 2740 if (error == ENOENT) 2741 error = 0; 2742 if (error == 0 && boff != bp->b_bufsize) { 2743 KKASSERT(boff < bp->b_bufsize); 2744 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff); 2745 /* boff = bp->b_bufsize; */ 2746 } 2747 bp->b_resid = 0; 2748 bp->b_error = error; 2749 if (error) 2750 bp->b_flags |= B_ERROR; 2751 biodone(ap->a_bio); 2752 2753 done: 2754 /* 2755 * Cache the b-tree node for the last data read in cache[1]. 2756 * 2757 * If we hit the file EOF then also cache the node in the 2758 * governing director's cache[3], it will be used to initialize 2759 * the inode's cache[1] for any inodes looked up via the directory. 2760 * 2761 * This doesn't reduce disk accesses since the B-Tree chain is 2762 * likely cached, but it does reduce cpu overhead when looking 2763 * up file offsets for cpdup/tar/cpio style iterations. 2764 */ 2765 if (cursor.node) 2766 hammer_cache_node(&ip->cache[1], cursor.node); 2767 if (ran_end >= ip->ino_data.size) { 2768 dip = hammer_find_inode(&trans, ip->ino_data.parent_obj_id, 2769 ip->obj_asof, ip->obj_localization); 2770 if (dip) { 2771 hammer_cache_node(&dip->cache[3], cursor.node); 2772 hammer_rel_inode(dip, 0); 2773 } 2774 } 2775 hammer_done_cursor(&cursor); 2776 hammer_done_transaction(&trans); 2777 return(error); 2778 } 2779 2780 /* 2781 * BMAP operation - used to support cluster_read() only. 2782 * 2783 * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb) 2784 * 2785 * This routine may return EOPNOTSUPP if the opration is not supported for 2786 * the specified offset. The contents of the pointer arguments do not 2787 * need to be initialized in that case. 2788 * 2789 * If a disk address is available and properly aligned return 0 with 2790 * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately 2791 * to the run-length relative to that offset. Callers may assume that 2792 * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently 2793 * large, so return EOPNOTSUPP if it is not sufficiently large. 2794 */ 2795 static 2796 int 2797 hammer_vop_bmap(struct vop_bmap_args *ap) 2798 { 2799 struct hammer_transaction trans; 2800 struct hammer_inode *ip; 2801 struct hammer_cursor cursor; 2802 hammer_base_elm_t base; 2803 int64_t rec_offset; 2804 int64_t ran_end; 2805 int64_t tmp64; 2806 int64_t base_offset; 2807 int64_t base_disk_offset; 2808 int64_t last_offset; 2809 hammer_off_t last_disk_offset; 2810 hammer_off_t disk_offset; 2811 int rec_len; 2812 int error; 2813 int blksize; 2814 2815 ++hammer_stats_file_iopsr; 2816 ip = ap->a_vp->v_data; 2817 2818 /* 2819 * We can only BMAP regular files. We can't BMAP database files, 2820 * directories, etc. 2821 */ 2822 if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE) 2823 return(EOPNOTSUPP); 2824 2825 /* 2826 * bmap is typically called with runp/runb both NULL when used 2827 * for writing. We do not support BMAP for writing atm. 2828 */ 2829 if (ap->a_cmd != BUF_CMD_READ) 2830 return(EOPNOTSUPP); 2831 2832 /* 2833 * Scan the B-Tree to acquire blockmap addresses, then translate 2834 * to raw addresses. 2835 */ 2836 hammer_simple_transaction(&trans, ip->hmp); 2837 #if 0 2838 kprintf("bmap_beg %016llx ip->cache %p\n", 2839 (long long)ap->a_loffset, ip->cache[1]); 2840 #endif 2841 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 2842 2843 /* 2844 * Key range (begin and end inclusive) to scan. Note that the key's 2845 * stored in the actual records represent BASE+LEN, not BASE. The 2846 * first record containing bio_offset will have a key > bio_offset. 2847 */ 2848 cursor.key_beg.localization = ip->obj_localization + 2849 HAMMER_LOCALIZE_MISC; 2850 cursor.key_beg.obj_id = ip->obj_id; 2851 cursor.key_beg.create_tid = 0; 2852 cursor.key_beg.delete_tid = 0; 2853 cursor.key_beg.obj_type = 0; 2854 if (ap->a_runb) 2855 cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1; 2856 else 2857 cursor.key_beg.key = ap->a_loffset + 1; 2858 if (cursor.key_beg.key < 0) 2859 cursor.key_beg.key = 0; 2860 cursor.asof = ip->obj_asof; 2861 cursor.flags |= HAMMER_CURSOR_ASOF; 2862 2863 cursor.key_end = cursor.key_beg; 2864 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE); 2865 2866 ran_end = ap->a_loffset + MAXPHYS; 2867 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA; 2868 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA; 2869 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */ 2870 if (tmp64 < ran_end) 2871 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL; 2872 else 2873 cursor.key_end.key = ran_end + MAXPHYS + 1; 2874 2875 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE; 2876 2877 error = hammer_ip_first(&cursor); 2878 base_offset = last_offset = 0; 2879 base_disk_offset = last_disk_offset = 0; 2880 2881 while (error == 0) { 2882 /* 2883 * Get the base file offset of the record. The key for 2884 * data records is (base + bytes) rather then (base). 2885 * 2886 * NOTE: rec_offset + rec_len may exceed the end-of-file. 2887 * The extra bytes should be zero on-disk and the BMAP op 2888 * should still be ok. 2889 */ 2890 base = &cursor.leaf->base; 2891 rec_offset = base->key - cursor.leaf->data_len; 2892 rec_len = cursor.leaf->data_len; 2893 2894 /* 2895 * Incorporate any cached truncation. 2896 * 2897 * NOTE: Modifications to rec_len based on synthesized 2898 * truncation points remove the guarantee that any extended 2899 * data on disk is zero (since the truncations may not have 2900 * taken place on-media yet). 2901 */ 2902 if (ip->flags & HAMMER_INODE_TRUNCATED) { 2903 if (hammer_cursor_ondisk(&cursor) || 2904 cursor.iprec->flush_state == HAMMER_FST_FLUSH) { 2905 if (ip->trunc_off <= rec_offset) 2906 rec_len = 0; 2907 else if (ip->trunc_off < rec_offset + rec_len) 2908 rec_len = (int)(ip->trunc_off - rec_offset); 2909 } 2910 } 2911 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 2912 if (hammer_cursor_ondisk(&cursor)) { 2913 if (ip->sync_trunc_off <= rec_offset) 2914 rec_len = 0; 2915 else if (ip->sync_trunc_off < rec_offset + rec_len) 2916 rec_len = (int)(ip->sync_trunc_off - rec_offset); 2917 } 2918 } 2919 2920 /* 2921 * Accumulate information. If we have hit a discontiguous 2922 * block reset base_offset unless we are already beyond the 2923 * requested offset. If we are, that's it, we stop. 2924 */ 2925 if (error) 2926 break; 2927 if (hammer_cursor_ondisk(&cursor)) { 2928 disk_offset = cursor.leaf->data_offset; 2929 if (rec_offset != last_offset || 2930 disk_offset != last_disk_offset) { 2931 if (rec_offset > ap->a_loffset) 2932 break; 2933 base_offset = rec_offset; 2934 base_disk_offset = disk_offset; 2935 } 2936 last_offset = rec_offset + rec_len; 2937 last_disk_offset = disk_offset + rec_len; 2938 } 2939 error = hammer_ip_next(&cursor); 2940 } 2941 2942 #if 0 2943 kprintf("BMAP %016llx: %016llx - %016llx\n", 2944 (long long)ap->a_loffset, 2945 (long long)base_offset, 2946 (long long)last_offset); 2947 kprintf("BMAP %16s: %016llx - %016llx\n", "", 2948 (long long)base_disk_offset, 2949 (long long)last_disk_offset); 2950 #endif 2951 2952 if (cursor.node) { 2953 hammer_cache_node(&ip->cache[1], cursor.node); 2954 #if 0 2955 kprintf("bmap_end2 %016llx ip->cache %p\n", 2956 (long long)ap->a_loffset, ip->cache[1]); 2957 #endif 2958 } 2959 hammer_done_cursor(&cursor); 2960 hammer_done_transaction(&trans); 2961 2962 /* 2963 * If we couldn't find any records or the records we did find were 2964 * all behind the requested offset, return failure. A forward 2965 * truncation can leave a hole w/ no on-disk records. 2966 */ 2967 if (last_offset == 0 || last_offset < ap->a_loffset) 2968 return (EOPNOTSUPP); 2969 2970 /* 2971 * Figure out the block size at the requested offset and adjust 2972 * our limits so the cluster_read() does not create inappropriately 2973 * sized buffer cache buffers. 2974 */ 2975 blksize = hammer_blocksize(ap->a_loffset); 2976 if (hammer_blocksize(base_offset) != blksize) { 2977 base_offset = hammer_blockdemarc(base_offset, ap->a_loffset); 2978 } 2979 if (last_offset != ap->a_loffset && 2980 hammer_blocksize(last_offset - 1) != blksize) { 2981 last_offset = hammer_blockdemarc(ap->a_loffset, 2982 last_offset - 1); 2983 } 2984 2985 /* 2986 * Returning EOPNOTSUPP simply prevents the direct-IO optimization 2987 * from occuring. 2988 */ 2989 disk_offset = base_disk_offset + (ap->a_loffset - base_offset); 2990 2991 if ((disk_offset & HAMMER_OFF_ZONE_MASK) != HAMMER_ZONE_LARGE_DATA) { 2992 /* 2993 * Only large-data zones can be direct-IOd 2994 */ 2995 error = EOPNOTSUPP; 2996 } else if ((disk_offset & HAMMER_BUFMASK) || 2997 (last_offset - ap->a_loffset) < blksize) { 2998 /* 2999 * doffsetp is not aligned or the forward run size does 3000 * not cover a whole buffer, disallow the direct I/O. 3001 */ 3002 error = EOPNOTSUPP; 3003 } else { 3004 /* 3005 * We're good. 3006 */ 3007 *ap->a_doffsetp = disk_offset; 3008 if (ap->a_runb) { 3009 *ap->a_runb = ap->a_loffset - base_offset; 3010 KKASSERT(*ap->a_runb >= 0); 3011 } 3012 if (ap->a_runp) { 3013 *ap->a_runp = last_offset - ap->a_loffset; 3014 KKASSERT(*ap->a_runp >= 0); 3015 } 3016 error = 0; 3017 } 3018 return(error); 3019 } 3020 3021 /* 3022 * Write to a regular file. Because this is a strategy call the OS is 3023 * trying to actually get data onto the media. 3024 */ 3025 static 3026 int 3027 hammer_vop_strategy_write(struct vop_strategy_args *ap) 3028 { 3029 hammer_record_t record; 3030 hammer_mount_t hmp; 3031 hammer_inode_t ip; 3032 struct bio *bio; 3033 struct buf *bp; 3034 int blksize; 3035 int bytes; 3036 int error; 3037 3038 bio = ap->a_bio; 3039 bp = bio->bio_buf; 3040 ip = ap->a_vp->v_data; 3041 hmp = ip->hmp; 3042 3043 blksize = hammer_blocksize(bio->bio_offset); 3044 KKASSERT(bp->b_bufsize == blksize); 3045 3046 if (ip->flags & HAMMER_INODE_RO) { 3047 bp->b_error = EROFS; 3048 bp->b_flags |= B_ERROR; 3049 biodone(ap->a_bio); 3050 return(EROFS); 3051 } 3052 3053 /* 3054 * Interlock with inode destruction (no in-kernel or directory 3055 * topology visibility). If we queue new IO while trying to 3056 * destroy the inode we can deadlock the vtrunc call in 3057 * hammer_inode_unloadable_check(). 3058 * 3059 * Besides, there's no point flushing a bp associated with an 3060 * inode that is being destroyed on-media and has no kernel 3061 * references. 3062 */ 3063 if ((ip->flags | ip->sync_flags) & 3064 (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) { 3065 bp->b_resid = 0; 3066 biodone(ap->a_bio); 3067 return(0); 3068 } 3069 3070 /* 3071 * Reserve space and issue a direct-write from the front-end. 3072 * NOTE: The direct_io code will hammer_bread/bcopy smaller 3073 * allocations. 3074 * 3075 * An in-memory record will be installed to reference the storage 3076 * until the flusher can get to it. 3077 * 3078 * Since we own the high level bio the front-end will not try to 3079 * do a direct-read until the write completes. 3080 * 3081 * NOTE: The only time we do not reserve a full-sized buffers 3082 * worth of data is if the file is small. We do not try to 3083 * allocate a fragment (from the small-data zone) at the end of 3084 * an otherwise large file as this can lead to wildly separated 3085 * data. 3086 */ 3087 KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0); 3088 KKASSERT(bio->bio_offset < ip->ino_data.size); 3089 if (bio->bio_offset || ip->ino_data.size > HAMMER_BUFSIZE / 2) 3090 bytes = bp->b_bufsize; 3091 else 3092 bytes = ((int)ip->ino_data.size + 15) & ~15; 3093 3094 record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data, 3095 bytes, &error); 3096 3097 /* 3098 * B_VFSFLAG1 indicates that a REDO_WRITE entry was generated 3099 * in hammer_vop_write(). We must flag the record so the proper 3100 * REDO_TERM_WRITE entry is generated during the flush. 3101 */ 3102 if (record) { 3103 if (bp->b_flags & B_VFSFLAG1) { 3104 record->flags |= HAMMER_RECF_REDO; 3105 bp->b_flags &= ~B_VFSFLAG1; 3106 } 3107 hammer_io_direct_write(hmp, bio, record); 3108 if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs) 3109 hammer_flush_inode(ip, 0); 3110 } else { 3111 bp->b_bio2.bio_offset = NOOFFSET; 3112 bp->b_error = error; 3113 bp->b_flags |= B_ERROR; 3114 biodone(ap->a_bio); 3115 } 3116 return(error); 3117 } 3118 3119 /* 3120 * dounlink - disconnect a directory entry 3121 * 3122 * XXX whiteout support not really in yet 3123 */ 3124 static int 3125 hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch, 3126 struct vnode *dvp, struct ucred *cred, 3127 int flags, int isdir) 3128 { 3129 struct namecache *ncp; 3130 hammer_inode_t dip; 3131 hammer_inode_t ip; 3132 struct hammer_cursor cursor; 3133 int64_t namekey; 3134 u_int32_t max_iterations; 3135 int nlen, error; 3136 3137 /* 3138 * Calculate the namekey and setup the key range for the scan. This 3139 * works kinda like a chained hash table where the lower 32 bits 3140 * of the namekey synthesize the chain. 3141 * 3142 * The key range is inclusive of both key_beg and key_end. 3143 */ 3144 dip = VTOI(dvp); 3145 ncp = nch->ncp; 3146 3147 if (dip->flags & HAMMER_INODE_RO) 3148 return (EROFS); 3149 3150 namekey = hammer_directory_namekey(dip, ncp->nc_name, ncp->nc_nlen, 3151 &max_iterations); 3152 retry: 3153 hammer_init_cursor(trans, &cursor, &dip->cache[1], dip); 3154 cursor.key_beg.localization = dip->obj_localization + 3155 hammer_dir_localization(dip); 3156 cursor.key_beg.obj_id = dip->obj_id; 3157 cursor.key_beg.key = namekey; 3158 cursor.key_beg.create_tid = 0; 3159 cursor.key_beg.delete_tid = 0; 3160 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 3161 cursor.key_beg.obj_type = 0; 3162 3163 cursor.key_end = cursor.key_beg; 3164 cursor.key_end.key += max_iterations; 3165 cursor.asof = dip->obj_asof; 3166 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 3167 3168 /* 3169 * Scan all matching records (the chain), locate the one matching 3170 * the requested path component. info->last_error contains the 3171 * error code on search termination and could be 0, ENOENT, or 3172 * something else. 3173 * 3174 * The hammer_ip_*() functions merge in-memory records with on-disk 3175 * records for the purposes of the search. 3176 */ 3177 error = hammer_ip_first(&cursor); 3178 3179 while (error == 0) { 3180 error = hammer_ip_resolve_data(&cursor); 3181 if (error) 3182 break; 3183 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF; 3184 KKASSERT(nlen > 0); 3185 if (ncp->nc_nlen == nlen && 3186 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) { 3187 break; 3188 } 3189 error = hammer_ip_next(&cursor); 3190 } 3191 3192 /* 3193 * If all is ok we have to get the inode so we can adjust nlinks. 3194 * To avoid a deadlock with the flusher we must release the inode 3195 * lock on the directory when acquiring the inode for the entry. 3196 * 3197 * If the target is a directory, it must be empty. 3198 */ 3199 if (error == 0) { 3200 hammer_unlock(&cursor.ip->lock); 3201 ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id, 3202 dip->hmp->asof, 3203 cursor.data->entry.localization, 3204 0, &error); 3205 hammer_lock_sh(&cursor.ip->lock); 3206 if (error == ENOENT) { 3207 kprintf("HAMMER: WARNING: Removing " 3208 "dirent w/missing inode \"%s\"\n" 3209 "\tobj_id = %016llx\n", 3210 ncp->nc_name, 3211 (long long)cursor.data->entry.obj_id); 3212 error = 0; 3213 } 3214 3215 /* 3216 * If isdir >= 0 we validate that the entry is or is not a 3217 * directory. If isdir < 0 we don't care. 3218 */ 3219 if (error == 0 && isdir >= 0 && ip) { 3220 if (isdir && 3221 ip->ino_data.obj_type != HAMMER_OBJTYPE_DIRECTORY) { 3222 error = ENOTDIR; 3223 } else if (isdir == 0 && 3224 ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY) { 3225 error = EISDIR; 3226 } 3227 } 3228 3229 /* 3230 * If we are trying to remove a directory the directory must 3231 * be empty. 3232 * 3233 * The check directory code can loop and deadlock/retry. Our 3234 * own cursor's node locks must be released to avoid a 3-way 3235 * deadlock with the flusher if the check directory code 3236 * blocks. 3237 * 3238 * If any changes whatsoever have been made to the cursor 3239 * set EDEADLK and retry. 3240 * 3241 * WARNING: See warnings in hammer_unlock_cursor() 3242 * function. 3243 */ 3244 if (error == 0 && ip && ip->ino_data.obj_type == 3245 HAMMER_OBJTYPE_DIRECTORY) { 3246 hammer_unlock_cursor(&cursor); 3247 error = hammer_ip_check_directory_empty(trans, ip); 3248 hammer_lock_cursor(&cursor); 3249 if (cursor.flags & HAMMER_CURSOR_RETEST) { 3250 kprintf("HAMMER: Warning: avoided deadlock " 3251 "on rmdir '%s'\n", 3252 ncp->nc_name); 3253 error = EDEADLK; 3254 } 3255 } 3256 3257 /* 3258 * Delete the directory entry. 3259 * 3260 * WARNING: hammer_ip_del_directory() may have to terminate 3261 * the cursor to avoid a deadlock. It is ok to call 3262 * hammer_done_cursor() twice. 3263 */ 3264 if (error == 0) { 3265 error = hammer_ip_del_directory(trans, &cursor, 3266 dip, ip); 3267 } 3268 hammer_done_cursor(&cursor); 3269 if (error == 0) { 3270 cache_setunresolved(nch); 3271 cache_setvp(nch, NULL); 3272 3273 /* 3274 * XXX locking. Note: ip->vp might get ripped out 3275 * when we setunresolved() the nch since we had 3276 * no other reference to it. In that case ip->vp 3277 * will be NULL. 3278 */ 3279 if (ip && ip->vp) { 3280 hammer_knote(ip->vp, NOTE_DELETE); 3281 cache_inval_vp(ip->vp, CINV_DESTROY); 3282 } 3283 } 3284 if (ip) 3285 hammer_rel_inode(ip, 0); 3286 } else { 3287 hammer_done_cursor(&cursor); 3288 } 3289 if (error == EDEADLK) 3290 goto retry; 3291 3292 return (error); 3293 } 3294 3295 /************************************************************************ 3296 * FIFO AND SPECFS OPS * 3297 ************************************************************************ 3298 * 3299 */ 3300 3301 static int 3302 hammer_vop_fifoclose (struct vop_close_args *ap) 3303 { 3304 /* XXX update itimes */ 3305 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3306 } 3307 3308 static int 3309 hammer_vop_fiforead (struct vop_read_args *ap) 3310 { 3311 int error; 3312 3313 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 3314 /* XXX update access time */ 3315 return (error); 3316 } 3317 3318 static int 3319 hammer_vop_fifowrite (struct vop_write_args *ap) 3320 { 3321 int error; 3322 3323 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 3324 /* XXX update access time */ 3325 return (error); 3326 } 3327 3328 static 3329 int 3330 hammer_vop_fifokqfilter(struct vop_kqfilter_args *ap) 3331 { 3332 int error; 3333 3334 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 3335 if (error) 3336 error = hammer_vop_kqfilter(ap); 3337 return(error); 3338 } 3339 3340 /************************************************************************ 3341 * KQFILTER OPS * 3342 ************************************************************************ 3343 * 3344 */ 3345 static void filt_hammerdetach(struct knote *kn); 3346 static int filt_hammerread(struct knote *kn, long hint); 3347 static int filt_hammerwrite(struct knote *kn, long hint); 3348 static int filt_hammervnode(struct knote *kn, long hint); 3349 3350 static struct filterops hammerread_filtops = 3351 { FILTEROP_ISFD, NULL, filt_hammerdetach, filt_hammerread }; 3352 static struct filterops hammerwrite_filtops = 3353 { FILTEROP_ISFD, NULL, filt_hammerdetach, filt_hammerwrite }; 3354 static struct filterops hammervnode_filtops = 3355 { FILTEROP_ISFD, NULL, filt_hammerdetach, filt_hammervnode }; 3356 3357 static 3358 int 3359 hammer_vop_kqfilter(struct vop_kqfilter_args *ap) 3360 { 3361 struct vnode *vp = ap->a_vp; 3362 struct knote *kn = ap->a_kn; 3363 3364 switch (kn->kn_filter) { 3365 case EVFILT_READ: 3366 kn->kn_fop = &hammerread_filtops; 3367 break; 3368 case EVFILT_WRITE: 3369 kn->kn_fop = &hammerwrite_filtops; 3370 break; 3371 case EVFILT_VNODE: 3372 kn->kn_fop = &hammervnode_filtops; 3373 break; 3374 default: 3375 return (EOPNOTSUPP); 3376 } 3377 3378 kn->kn_hook = (caddr_t)vp; 3379 3380 /* XXX: kq token actually protects the list */ 3381 lwkt_gettoken(&vp->v_token); 3382 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 3383 lwkt_reltoken(&vp->v_token); 3384 3385 return(0); 3386 } 3387 3388 static void 3389 filt_hammerdetach(struct knote *kn) 3390 { 3391 struct vnode *vp = (void *)kn->kn_hook; 3392 3393 lwkt_gettoken(&vp->v_token); 3394 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 3395 lwkt_reltoken(&vp->v_token); 3396 } 3397 3398 static int 3399 filt_hammerread(struct knote *kn, long hint) 3400 { 3401 struct vnode *vp = (void *)kn->kn_hook; 3402 hammer_inode_t ip = VTOI(vp); 3403 3404 if (hint == NOTE_REVOKE) { 3405 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 3406 return(1); 3407 } 3408 kn->kn_data = ip->ino_data.size - kn->kn_fp->f_offset; 3409 return (kn->kn_data != 0); 3410 } 3411 3412 static int 3413 filt_hammerwrite(struct knote *kn, long hint) 3414 { 3415 if (hint == NOTE_REVOKE) 3416 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 3417 kn->kn_data = 0; 3418 return (1); 3419 } 3420 3421 static int 3422 filt_hammervnode(struct knote *kn, long hint) 3423 { 3424 if (kn->kn_sfflags & hint) 3425 kn->kn_fflags |= hint; 3426 if (hint == NOTE_REVOKE) { 3427 kn->kn_flags |= EV_EOF; 3428 return (1); 3429 } 3430 return (kn->kn_fflags != 0); 3431 } 3432 3433