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