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