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); 937 938 /* 939 * Lookup the obj_id. This should always succeed. If it does not 940 * the filesystem may be damaged and we return a dummy inode. 941 */ 942 if (error == 0) { 943 ip = hammer_get_inode(&trans, dip, obj_id, 944 asof, localization, 945 flags, &error); 946 if (error == ENOENT) { 947 kprintf("HAMMER: WARNING: Missing " 948 "inode for dirent \"%s\"\n" 949 "\tobj_id = %016llx\n", 950 ncp->nc_name, (long long)obj_id); 951 error = 0; 952 ip = hammer_get_dummy_inode(&trans, dip, obj_id, 953 asof, localization, 954 flags, &error); 955 } 956 if (error == 0) { 957 error = hammer_get_vnode(ip, &vp); 958 hammer_rel_inode(ip, 0); 959 } else { 960 vp = NULL; 961 } 962 if (error == 0) { 963 vn_unlock(vp); 964 cache_setvp(ap->a_nch, vp); 965 vrele(vp); 966 } 967 } else if (error == ENOENT) { 968 cache_setvp(ap->a_nch, NULL); 969 } 970 done: 971 hammer_done_transaction(&trans); 972 return (error); 973 } 974 975 /* 976 * hammer_vop_nlookupdotdot { dvp, vpp, cred } 977 * 978 * Locate the parent directory of a directory vnode. 979 * 980 * dvp is referenced but not locked. *vpp must be returned referenced and 981 * locked. A parent_obj_id of 0 does not necessarily indicate that we are 982 * at the root, instead it could indicate that the directory we were in was 983 * removed. 984 * 985 * NOTE: as-of sequences are not linked into the directory structure. If 986 * we are at the root with a different asof then the mount point, reload 987 * the same directory with the mount point's asof. I'm not sure what this 988 * will do to NFS. We encode ASOF stamps in NFS file handles so it might not 989 * get confused, but it hasn't been tested. 990 */ 991 static 992 int 993 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap) 994 { 995 struct hammer_transaction trans; 996 struct hammer_inode *dip; 997 struct hammer_inode *ip; 998 int64_t parent_obj_id; 999 u_int32_t parent_obj_localization; 1000 hammer_tid_t asof; 1001 int error; 1002 1003 dip = VTOI(ap->a_dvp); 1004 asof = dip->obj_asof; 1005 1006 /* 1007 * Whos are parent? This could be the root of a pseudo-filesystem 1008 * whos parent is in another localization domain. 1009 */ 1010 parent_obj_id = dip->ino_data.parent_obj_id; 1011 if (dip->obj_id == HAMMER_OBJID_ROOT) 1012 parent_obj_localization = dip->ino_data.ext.obj.parent_obj_localization; 1013 else 1014 parent_obj_localization = dip->obj_localization; 1015 1016 if (parent_obj_id == 0) { 1017 if (dip->obj_id == HAMMER_OBJID_ROOT && 1018 asof != dip->hmp->asof) { 1019 parent_obj_id = dip->obj_id; 1020 asof = dip->hmp->asof; 1021 *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK); 1022 ksnprintf(*ap->a_fakename, 19, "0x%016llx", 1023 dip->obj_asof); 1024 } else { 1025 *ap->a_vpp = NULL; 1026 return ENOENT; 1027 } 1028 } 1029 1030 hammer_simple_transaction(&trans, dip->hmp); 1031 ++hammer_stats_file_iopsr; 1032 1033 ip = hammer_get_inode(&trans, dip, parent_obj_id, 1034 asof, parent_obj_localization, 1035 dip->flags, &error); 1036 if (ip) { 1037 error = hammer_get_vnode(ip, ap->a_vpp); 1038 hammer_rel_inode(ip, 0); 1039 } else { 1040 *ap->a_vpp = NULL; 1041 } 1042 hammer_done_transaction(&trans); 1043 return (error); 1044 } 1045 1046 /* 1047 * hammer_vop_nlink { nch, dvp, vp, cred } 1048 */ 1049 static 1050 int 1051 hammer_vop_nlink(struct vop_nlink_args *ap) 1052 { 1053 struct hammer_transaction trans; 1054 struct hammer_inode *dip; 1055 struct hammer_inode *ip; 1056 struct nchandle *nch; 1057 int error; 1058 1059 if (ap->a_dvp->v_mount != ap->a_vp->v_mount) 1060 return(EXDEV); 1061 1062 nch = ap->a_nch; 1063 dip = VTOI(ap->a_dvp); 1064 ip = VTOI(ap->a_vp); 1065 1066 if (dip->obj_localization != ip->obj_localization) 1067 return(EXDEV); 1068 1069 if (dip->flags & HAMMER_INODE_RO) 1070 return (EROFS); 1071 if (ip->flags & HAMMER_INODE_RO) 1072 return (EROFS); 1073 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) 1074 return (error); 1075 1076 /* 1077 * Create a transaction to cover the operations we perform. 1078 */ 1079 hammer_start_transaction(&trans, dip->hmp); 1080 ++hammer_stats_file_iopsw; 1081 1082 /* 1083 * Add the filesystem object to the directory. Note that neither 1084 * dip nor ip are referenced or locked, but their vnodes are 1085 * referenced. This function will bump the inode's link count. 1086 */ 1087 error = hammer_ip_add_directory(&trans, dip, 1088 nch->ncp->nc_name, nch->ncp->nc_nlen, 1089 ip); 1090 1091 /* 1092 * Finish up. 1093 */ 1094 if (error == 0) { 1095 cache_setunresolved(nch); 1096 cache_setvp(nch, ap->a_vp); 1097 } 1098 hammer_done_transaction(&trans); 1099 hammer_knote(ap->a_vp, NOTE_LINK); 1100 hammer_knote(ap->a_dvp, NOTE_WRITE); 1101 return (error); 1102 } 1103 1104 /* 1105 * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap } 1106 * 1107 * The operating system has already ensured that the directory entry 1108 * does not exist and done all appropriate namespace locking. 1109 */ 1110 static 1111 int 1112 hammer_vop_nmkdir(struct vop_nmkdir_args *ap) 1113 { 1114 struct hammer_transaction trans; 1115 struct hammer_inode *dip; 1116 struct hammer_inode *nip; 1117 struct nchandle *nch; 1118 int error; 1119 1120 nch = ap->a_nch; 1121 dip = VTOI(ap->a_dvp); 1122 1123 if (dip->flags & HAMMER_INODE_RO) 1124 return (EROFS); 1125 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) 1126 return (error); 1127 1128 /* 1129 * Create a transaction to cover the operations we perform. 1130 */ 1131 hammer_start_transaction(&trans, dip->hmp); 1132 ++hammer_stats_file_iopsw; 1133 1134 /* 1135 * Create a new filesystem object of the requested type. The 1136 * returned inode will be referenced but not locked. 1137 */ 1138 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 1139 dip, NULL, &nip); 1140 if (error) { 1141 hkprintf("hammer_mkdir error %d\n", error); 1142 hammer_done_transaction(&trans); 1143 *ap->a_vpp = NULL; 1144 return (error); 1145 } 1146 /* 1147 * Add the new filesystem object to the directory. This will also 1148 * bump the inode's link count. 1149 */ 1150 error = hammer_ip_add_directory(&trans, dip, 1151 nch->ncp->nc_name, nch->ncp->nc_nlen, 1152 nip); 1153 if (error) 1154 hkprintf("hammer_mkdir (add) error %d\n", error); 1155 1156 /* 1157 * Finish up. 1158 */ 1159 if (error) { 1160 hammer_rel_inode(nip, 0); 1161 *ap->a_vpp = NULL; 1162 } else { 1163 error = hammer_get_vnode(nip, ap->a_vpp); 1164 hammer_rel_inode(nip, 0); 1165 if (error == 0) { 1166 cache_setunresolved(ap->a_nch); 1167 cache_setvp(ap->a_nch, *ap->a_vpp); 1168 } 1169 } 1170 hammer_done_transaction(&trans); 1171 if (error == 0) 1172 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1173 return (error); 1174 } 1175 1176 /* 1177 * hammer_vop_nmknod { nch, dvp, vpp, cred, vap } 1178 * 1179 * The operating system has already ensured that the directory entry 1180 * does not exist and done all appropriate namespace locking. 1181 */ 1182 static 1183 int 1184 hammer_vop_nmknod(struct vop_nmknod_args *ap) 1185 { 1186 struct hammer_transaction trans; 1187 struct hammer_inode *dip; 1188 struct hammer_inode *nip; 1189 struct nchandle *nch; 1190 int error; 1191 1192 nch = ap->a_nch; 1193 dip = VTOI(ap->a_dvp); 1194 1195 if (dip->flags & HAMMER_INODE_RO) 1196 return (EROFS); 1197 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) 1198 return (error); 1199 1200 /* 1201 * Create a transaction to cover the operations we perform. 1202 */ 1203 hammer_start_transaction(&trans, dip->hmp); 1204 ++hammer_stats_file_iopsw; 1205 1206 /* 1207 * Create a new filesystem object of the requested type. The 1208 * returned inode will be referenced but not locked. 1209 * 1210 * If mknod specifies a directory a pseudo-fs is created. 1211 */ 1212 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 1213 dip, NULL, &nip); 1214 if (error) { 1215 hammer_done_transaction(&trans); 1216 *ap->a_vpp = NULL; 1217 return (error); 1218 } 1219 1220 /* 1221 * Add the new filesystem object to the directory. This will also 1222 * bump the inode's link count. 1223 */ 1224 error = hammer_ip_add_directory(&trans, dip, 1225 nch->ncp->nc_name, nch->ncp->nc_nlen, 1226 nip); 1227 1228 /* 1229 * Finish up. 1230 */ 1231 if (error) { 1232 hammer_rel_inode(nip, 0); 1233 *ap->a_vpp = NULL; 1234 } else { 1235 error = hammer_get_vnode(nip, ap->a_vpp); 1236 hammer_rel_inode(nip, 0); 1237 if (error == 0) { 1238 cache_setunresolved(ap->a_nch); 1239 cache_setvp(ap->a_nch, *ap->a_vpp); 1240 } 1241 } 1242 hammer_done_transaction(&trans); 1243 if (error == 0) 1244 hammer_knote(ap->a_dvp, NOTE_WRITE); 1245 return (error); 1246 } 1247 1248 /* 1249 * hammer_vop_open { vp, mode, cred, fp } 1250 */ 1251 static 1252 int 1253 hammer_vop_open(struct vop_open_args *ap) 1254 { 1255 hammer_inode_t ip; 1256 1257 ++hammer_stats_file_iopsr; 1258 ip = VTOI(ap->a_vp); 1259 1260 if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO)) 1261 return (EROFS); 1262 return(vop_stdopen(ap)); 1263 } 1264 1265 /* 1266 * hammer_vop_print { vp } 1267 */ 1268 static 1269 int 1270 hammer_vop_print(struct vop_print_args *ap) 1271 { 1272 return EOPNOTSUPP; 1273 } 1274 1275 /* 1276 * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies } 1277 */ 1278 static 1279 int 1280 hammer_vop_readdir(struct vop_readdir_args *ap) 1281 { 1282 struct hammer_transaction trans; 1283 struct hammer_cursor cursor; 1284 struct hammer_inode *ip; 1285 struct uio *uio; 1286 hammer_base_elm_t base; 1287 int error; 1288 int cookie_index; 1289 int ncookies; 1290 off_t *cookies; 1291 off_t saveoff; 1292 int r; 1293 int dtype; 1294 1295 ++hammer_stats_file_iopsr; 1296 ip = VTOI(ap->a_vp); 1297 uio = ap->a_uio; 1298 saveoff = uio->uio_offset; 1299 1300 if (ap->a_ncookies) { 1301 ncookies = uio->uio_resid / 16 + 1; 1302 if (ncookies > 1024) 1303 ncookies = 1024; 1304 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 1305 cookie_index = 0; 1306 } else { 1307 ncookies = -1; 1308 cookies = NULL; 1309 cookie_index = 0; 1310 } 1311 1312 hammer_simple_transaction(&trans, ip->hmp); 1313 1314 /* 1315 * Handle artificial entries 1316 * 1317 * It should be noted that the minimum value for a directory 1318 * hash key on-media is 0x0000000100000000, so we can use anything 1319 * less then that to represent our 'special' key space. 1320 */ 1321 error = 0; 1322 if (saveoff == 0) { 1323 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, "."); 1324 if (r) 1325 goto done; 1326 if (cookies) 1327 cookies[cookie_index] = saveoff; 1328 ++saveoff; 1329 ++cookie_index; 1330 if (cookie_index == ncookies) 1331 goto done; 1332 } 1333 if (saveoff == 1) { 1334 if (ip->ino_data.parent_obj_id) { 1335 r = vop_write_dirent(&error, uio, 1336 ip->ino_data.parent_obj_id, 1337 DT_DIR, 2, ".."); 1338 } else { 1339 r = vop_write_dirent(&error, uio, 1340 ip->obj_id, DT_DIR, 2, ".."); 1341 } 1342 if (r) 1343 goto done; 1344 if (cookies) 1345 cookies[cookie_index] = saveoff; 1346 ++saveoff; 1347 ++cookie_index; 1348 if (cookie_index == ncookies) 1349 goto done; 1350 } 1351 1352 /* 1353 * Key range (begin and end inclusive) to scan. Directory keys 1354 * directly translate to a 64 bit 'seek' position. 1355 */ 1356 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 1357 cursor.key_beg.localization = ip->obj_localization + 1358 HAMMER_LOCALIZE_MISC; 1359 cursor.key_beg.obj_id = ip->obj_id; 1360 cursor.key_beg.create_tid = 0; 1361 cursor.key_beg.delete_tid = 0; 1362 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 1363 cursor.key_beg.obj_type = 0; 1364 cursor.key_beg.key = saveoff; 1365 1366 cursor.key_end = cursor.key_beg; 1367 cursor.key_end.key = HAMMER_MAX_KEY; 1368 cursor.asof = ip->obj_asof; 1369 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 1370 1371 error = hammer_ip_first(&cursor); 1372 1373 while (error == 0) { 1374 error = hammer_ip_resolve_data(&cursor); 1375 if (error) 1376 break; 1377 base = &cursor.leaf->base; 1378 saveoff = base->key; 1379 KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF); 1380 1381 if (base->obj_id != ip->obj_id) 1382 panic("readdir: bad record at %p", cursor.node); 1383 1384 /* 1385 * Convert pseudo-filesystems into softlinks 1386 */ 1387 dtype = hammer_get_dtype(cursor.leaf->base.obj_type); 1388 r = vop_write_dirent( 1389 &error, uio, cursor.data->entry.obj_id, 1390 dtype, 1391 cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF , 1392 (void *)cursor.data->entry.name); 1393 if (r) 1394 break; 1395 ++saveoff; 1396 if (cookies) 1397 cookies[cookie_index] = base->key; 1398 ++cookie_index; 1399 if (cookie_index == ncookies) 1400 break; 1401 error = hammer_ip_next(&cursor); 1402 } 1403 hammer_done_cursor(&cursor); 1404 1405 done: 1406 hammer_done_transaction(&trans); 1407 1408 if (ap->a_eofflag) 1409 *ap->a_eofflag = (error == ENOENT); 1410 uio->uio_offset = saveoff; 1411 if (error && cookie_index == 0) { 1412 if (error == ENOENT) 1413 error = 0; 1414 if (cookies) { 1415 kfree(cookies, M_TEMP); 1416 *ap->a_ncookies = 0; 1417 *ap->a_cookies = NULL; 1418 } 1419 } else { 1420 if (error == ENOENT) 1421 error = 0; 1422 if (cookies) { 1423 *ap->a_ncookies = cookie_index; 1424 *ap->a_cookies = cookies; 1425 } 1426 } 1427 return(error); 1428 } 1429 1430 /* 1431 * hammer_vop_readlink { vp, uio, cred } 1432 */ 1433 static 1434 int 1435 hammer_vop_readlink(struct vop_readlink_args *ap) 1436 { 1437 struct hammer_transaction trans; 1438 struct hammer_cursor cursor; 1439 struct hammer_inode *ip; 1440 char buf[32]; 1441 u_int32_t localization; 1442 hammer_pseudofs_inmem_t pfsm; 1443 int error; 1444 1445 ip = VTOI(ap->a_vp); 1446 1447 /* 1448 * Shortcut if the symlink data was stuffed into ino_data. 1449 * 1450 * Also expand special "@@PFS%05d" softlinks (expansion only 1451 * occurs for non-historical (current) accesses made from the 1452 * primary filesystem). 1453 */ 1454 if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) { 1455 char *ptr; 1456 int bytes; 1457 1458 ptr = ip->ino_data.ext.symlink; 1459 bytes = (int)ip->ino_data.size; 1460 if (bytes == 10 && 1461 ip->obj_asof == HAMMER_MAX_TID && 1462 ip->obj_localization == 0 && 1463 strncmp(ptr, "@@PFS", 5) == 0) { 1464 hammer_simple_transaction(&trans, ip->hmp); 1465 bcopy(ptr + 5, buf, 5); 1466 buf[5] = 0; 1467 localization = strtoul(buf, NULL, 10) << 16; 1468 pfsm = hammer_load_pseudofs(&trans, localization, 1469 &error); 1470 if (error == 0) { 1471 if (pfsm->pfsd.mirror_flags & 1472 HAMMER_PFSD_SLAVE) { 1473 /* vap->va_size == 26 */ 1474 ksnprintf(buf, sizeof(buf), 1475 "@@0x%016llx:%05d", 1476 pfsm->pfsd.sync_end_tid, 1477 localization >> 16); 1478 } else { 1479 /* vap->va_size == 10 */ 1480 ksnprintf(buf, sizeof(buf), 1481 "@@-1:%05d", 1482 localization >> 16); 1483 #if 0 1484 ksnprintf(buf, sizeof(buf), 1485 "@@0x%016llx:%05d", 1486 HAMMER_MAX_TID, 1487 localization >> 16); 1488 #endif 1489 } 1490 ptr = buf; 1491 bytes = strlen(buf); 1492 } 1493 if (pfsm) 1494 hammer_rel_pseudofs(trans.hmp, pfsm); 1495 hammer_done_transaction(&trans); 1496 } 1497 error = uiomove(ptr, bytes, ap->a_uio); 1498 return(error); 1499 } 1500 1501 /* 1502 * Long version 1503 */ 1504 hammer_simple_transaction(&trans, ip->hmp); 1505 ++hammer_stats_file_iopsr; 1506 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 1507 1508 /* 1509 * Key range (begin and end inclusive) to scan. Directory keys 1510 * directly translate to a 64 bit 'seek' position. 1511 */ 1512 cursor.key_beg.localization = ip->obj_localization + 1513 HAMMER_LOCALIZE_MISC; 1514 cursor.key_beg.obj_id = ip->obj_id; 1515 cursor.key_beg.create_tid = 0; 1516 cursor.key_beg.delete_tid = 0; 1517 cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX; 1518 cursor.key_beg.obj_type = 0; 1519 cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK; 1520 cursor.asof = ip->obj_asof; 1521 cursor.flags |= HAMMER_CURSOR_ASOF; 1522 1523 error = hammer_ip_lookup(&cursor); 1524 if (error == 0) { 1525 error = hammer_ip_resolve_data(&cursor); 1526 if (error == 0) { 1527 KKASSERT(cursor.leaf->data_len >= 1528 HAMMER_SYMLINK_NAME_OFF); 1529 error = uiomove(cursor.data->symlink.name, 1530 cursor.leaf->data_len - 1531 HAMMER_SYMLINK_NAME_OFF, 1532 ap->a_uio); 1533 } 1534 } 1535 hammer_done_cursor(&cursor); 1536 hammer_done_transaction(&trans); 1537 return(error); 1538 } 1539 1540 /* 1541 * hammer_vop_nremove { nch, dvp, cred } 1542 */ 1543 static 1544 int 1545 hammer_vop_nremove(struct vop_nremove_args *ap) 1546 { 1547 struct hammer_transaction trans; 1548 struct hammer_inode *dip; 1549 int error; 1550 1551 dip = VTOI(ap->a_dvp); 1552 1553 if (hammer_nohistory(dip) == 0 && 1554 (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 1555 return (error); 1556 } 1557 1558 hammer_start_transaction(&trans, dip->hmp); 1559 ++hammer_stats_file_iopsw; 1560 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 0); 1561 hammer_done_transaction(&trans); 1562 if (error == 0) 1563 hammer_knote(ap->a_dvp, NOTE_WRITE); 1564 return (error); 1565 } 1566 1567 /* 1568 * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred } 1569 */ 1570 static 1571 int 1572 hammer_vop_nrename(struct vop_nrename_args *ap) 1573 { 1574 struct hammer_transaction trans; 1575 struct namecache *fncp; 1576 struct namecache *tncp; 1577 struct hammer_inode *fdip; 1578 struct hammer_inode *tdip; 1579 struct hammer_inode *ip; 1580 struct hammer_cursor cursor; 1581 int64_t namekey; 1582 u_int32_t max_iterations; 1583 int nlen, error; 1584 1585 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount) 1586 return(EXDEV); 1587 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount) 1588 return(EXDEV); 1589 1590 fdip = VTOI(ap->a_fdvp); 1591 tdip = VTOI(ap->a_tdvp); 1592 fncp = ap->a_fnch->ncp; 1593 tncp = ap->a_tnch->ncp; 1594 ip = VTOI(fncp->nc_vp); 1595 KKASSERT(ip != NULL); 1596 1597 if (fdip->obj_localization != tdip->obj_localization) 1598 return(EXDEV); 1599 if (fdip->obj_localization != ip->obj_localization) 1600 return(EXDEV); 1601 1602 if (fdip->flags & HAMMER_INODE_RO) 1603 return (EROFS); 1604 if (tdip->flags & HAMMER_INODE_RO) 1605 return (EROFS); 1606 if (ip->flags & HAMMER_INODE_RO) 1607 return (EROFS); 1608 if ((error = hammer_checkspace(fdip->hmp, HAMMER_CHKSPC_CREATE)) != 0) 1609 return (error); 1610 1611 hammer_start_transaction(&trans, fdip->hmp); 1612 ++hammer_stats_file_iopsw; 1613 1614 /* 1615 * Remove tncp from the target directory and then link ip as 1616 * tncp. XXX pass trans to dounlink 1617 * 1618 * Force the inode sync-time to match the transaction so it is 1619 * in-sync with the creation of the target directory entry. 1620 */ 1621 error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp, 1622 ap->a_cred, 0, -1); 1623 if (error == 0 || error == ENOENT) { 1624 error = hammer_ip_add_directory(&trans, tdip, 1625 tncp->nc_name, tncp->nc_nlen, 1626 ip); 1627 if (error == 0) { 1628 ip->ino_data.parent_obj_id = tdip->obj_id; 1629 hammer_modify_inode(ip, HAMMER_INODE_DDIRTY); 1630 } 1631 } 1632 if (error) 1633 goto failed; /* XXX */ 1634 1635 /* 1636 * Locate the record in the originating directory and remove it. 1637 * 1638 * Calculate the namekey and setup the key range for the scan. This 1639 * works kinda like a chained hash table where the lower 32 bits 1640 * of the namekey synthesize the chain. 1641 * 1642 * The key range is inclusive of both key_beg and key_end. 1643 */ 1644 namekey = hammer_directory_namekey(fdip, fncp->nc_name, fncp->nc_nlen, 1645 &max_iterations); 1646 retry: 1647 hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip); 1648 cursor.key_beg.localization = fdip->obj_localization + 1649 HAMMER_LOCALIZE_MISC; 1650 cursor.key_beg.obj_id = fdip->obj_id; 1651 cursor.key_beg.key = namekey; 1652 cursor.key_beg.create_tid = 0; 1653 cursor.key_beg.delete_tid = 0; 1654 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 1655 cursor.key_beg.obj_type = 0; 1656 1657 cursor.key_end = cursor.key_beg; 1658 cursor.key_end.key += max_iterations; 1659 cursor.asof = fdip->obj_asof; 1660 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 1661 1662 /* 1663 * Scan all matching records (the chain), locate the one matching 1664 * the requested path component. 1665 * 1666 * The hammer_ip_*() functions merge in-memory records with on-disk 1667 * records for the purposes of the search. 1668 */ 1669 error = hammer_ip_first(&cursor); 1670 while (error == 0) { 1671 if (hammer_ip_resolve_data(&cursor) != 0) 1672 break; 1673 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF; 1674 KKASSERT(nlen > 0); 1675 if (fncp->nc_nlen == nlen && 1676 bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) { 1677 break; 1678 } 1679 error = hammer_ip_next(&cursor); 1680 } 1681 1682 /* 1683 * If all is ok we have to get the inode so we can adjust nlinks. 1684 * 1685 * WARNING: hammer_ip_del_directory() may have to terminate the 1686 * cursor to avoid a recursion. It's ok to call hammer_done_cursor() 1687 * twice. 1688 */ 1689 if (error == 0) 1690 error = hammer_ip_del_directory(&trans, &cursor, fdip, ip); 1691 1692 /* 1693 * XXX A deadlock here will break rename's atomicy for the purposes 1694 * of crash recovery. 1695 */ 1696 if (error == EDEADLK) { 1697 hammer_done_cursor(&cursor); 1698 goto retry; 1699 } 1700 1701 /* 1702 * Cleanup and tell the kernel that the rename succeeded. 1703 */ 1704 hammer_done_cursor(&cursor); 1705 if (error == 0) { 1706 cache_rename(ap->a_fnch, ap->a_tnch); 1707 hammer_knote(ap->a_fdvp, NOTE_WRITE); 1708 hammer_knote(ap->a_tdvp, NOTE_WRITE); 1709 if (ip->vp) 1710 hammer_knote(ip->vp, NOTE_RENAME); 1711 } 1712 1713 failed: 1714 hammer_done_transaction(&trans); 1715 return (error); 1716 } 1717 1718 /* 1719 * hammer_vop_nrmdir { nch, dvp, cred } 1720 */ 1721 static 1722 int 1723 hammer_vop_nrmdir(struct vop_nrmdir_args *ap) 1724 { 1725 struct hammer_transaction trans; 1726 struct hammer_inode *dip; 1727 int error; 1728 1729 dip = VTOI(ap->a_dvp); 1730 1731 if (hammer_nohistory(dip) == 0 && 1732 (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 1733 return (error); 1734 } 1735 1736 hammer_start_transaction(&trans, dip->hmp); 1737 ++hammer_stats_file_iopsw; 1738 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 1); 1739 hammer_done_transaction(&trans); 1740 if (error == 0) 1741 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1742 return (error); 1743 } 1744 1745 /* 1746 * hammer_vop_markatime { vp, cred } 1747 */ 1748 static 1749 int 1750 hammer_vop_markatime(struct vop_markatime_args *ap) 1751 { 1752 struct hammer_transaction trans; 1753 struct hammer_inode *ip; 1754 1755 ip = VTOI(ap->a_vp); 1756 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 1757 return (EROFS); 1758 if (ip->flags & HAMMER_INODE_RO) 1759 return (EROFS); 1760 if (ip->hmp->mp->mnt_flag & MNT_NOATIME) 1761 return (0); 1762 hammer_start_transaction(&trans, ip->hmp); 1763 ++hammer_stats_file_iopsw; 1764 1765 ip->ino_data.atime = trans.time; 1766 hammer_modify_inode(ip, HAMMER_INODE_ATIME); 1767 hammer_done_transaction(&trans); 1768 hammer_knote(ap->a_vp, NOTE_ATTRIB); 1769 return (0); 1770 } 1771 1772 /* 1773 * hammer_vop_setattr { vp, vap, cred } 1774 */ 1775 static 1776 int 1777 hammer_vop_setattr(struct vop_setattr_args *ap) 1778 { 1779 struct hammer_transaction trans; 1780 struct vattr *vap; 1781 struct hammer_inode *ip; 1782 int modflags; 1783 int error; 1784 int truncating; 1785 int blksize; 1786 int kflags; 1787 int64_t aligned_size; 1788 u_int32_t flags; 1789 1790 vap = ap->a_vap; 1791 ip = ap->a_vp->v_data; 1792 modflags = 0; 1793 kflags = 0; 1794 1795 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 1796 return(EROFS); 1797 if (ip->flags & HAMMER_INODE_RO) 1798 return (EROFS); 1799 if (hammer_nohistory(ip) == 0 && 1800 (error = hammer_checkspace(ip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) { 1801 return (error); 1802 } 1803 1804 hammer_start_transaction(&trans, ip->hmp); 1805 ++hammer_stats_file_iopsw; 1806 error = 0; 1807 1808 if (vap->va_flags != VNOVAL) { 1809 flags = ip->ino_data.uflags; 1810 error = vop_helper_setattr_flags(&flags, vap->va_flags, 1811 hammer_to_unix_xid(&ip->ino_data.uid), 1812 ap->a_cred); 1813 if (error == 0) { 1814 if (ip->ino_data.uflags != flags) { 1815 ip->ino_data.uflags = flags; 1816 modflags |= HAMMER_INODE_DDIRTY; 1817 kflags |= NOTE_ATTRIB; 1818 } 1819 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) { 1820 error = 0; 1821 goto done; 1822 } 1823 } 1824 goto done; 1825 } 1826 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) { 1827 error = EPERM; 1828 goto done; 1829 } 1830 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 1831 mode_t cur_mode = ip->ino_data.mode; 1832 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid); 1833 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid); 1834 uuid_t uuid_uid; 1835 uuid_t uuid_gid; 1836 1837 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid, 1838 ap->a_cred, 1839 &cur_uid, &cur_gid, &cur_mode); 1840 if (error == 0) { 1841 hammer_guid_to_uuid(&uuid_uid, cur_uid); 1842 hammer_guid_to_uuid(&uuid_gid, cur_gid); 1843 if (bcmp(&uuid_uid, &ip->ino_data.uid, 1844 sizeof(uuid_uid)) || 1845 bcmp(&uuid_gid, &ip->ino_data.gid, 1846 sizeof(uuid_gid)) || 1847 ip->ino_data.mode != cur_mode 1848 ) { 1849 ip->ino_data.uid = uuid_uid; 1850 ip->ino_data.gid = uuid_gid; 1851 ip->ino_data.mode = cur_mode; 1852 } 1853 modflags |= HAMMER_INODE_DDIRTY; 1854 kflags |= NOTE_ATTRIB; 1855 } 1856 } 1857 while (vap->va_size != VNOVAL && ip->ino_data.size != vap->va_size) { 1858 switch(ap->a_vp->v_type) { 1859 case VREG: 1860 if (vap->va_size == ip->ino_data.size) 1861 break; 1862 /* 1863 * XXX break atomicy, we can deadlock the backend 1864 * if we do not release the lock. Probably not a 1865 * big deal here. 1866 */ 1867 blksize = hammer_blocksize(vap->va_size); 1868 if (vap->va_size < ip->ino_data.size) { 1869 vtruncbuf(ap->a_vp, vap->va_size, blksize); 1870 truncating = 1; 1871 kflags |= NOTE_WRITE; 1872 } else { 1873 vnode_pager_setsize(ap->a_vp, vap->va_size); 1874 truncating = 0; 1875 kflags |= NOTE_WRITE | NOTE_EXTEND; 1876 } 1877 ip->ino_data.size = vap->va_size; 1878 modflags |= HAMMER_INODE_DDIRTY; 1879 1880 /* 1881 * on-media truncation is cached in the inode until 1882 * the inode is synchronized. 1883 */ 1884 if (truncating) { 1885 hammer_ip_frontend_trunc(ip, vap->va_size); 1886 #ifdef DEBUG_TRUNCATE 1887 if (HammerTruncIp == NULL) 1888 HammerTruncIp = ip; 1889 #endif 1890 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) { 1891 ip->flags |= HAMMER_INODE_TRUNCATED; 1892 ip->trunc_off = vap->va_size; 1893 #ifdef DEBUG_TRUNCATE 1894 if (ip == HammerTruncIp) 1895 kprintf("truncate1 %016llx\n", ip->trunc_off); 1896 #endif 1897 } else if (ip->trunc_off > vap->va_size) { 1898 ip->trunc_off = vap->va_size; 1899 #ifdef DEBUG_TRUNCATE 1900 if (ip == HammerTruncIp) 1901 kprintf("truncate2 %016llx\n", ip->trunc_off); 1902 #endif 1903 } else { 1904 #ifdef DEBUG_TRUNCATE 1905 if (ip == HammerTruncIp) 1906 kprintf("truncate3 %016llx (ignored)\n", vap->va_size); 1907 #endif 1908 } 1909 } 1910 1911 /* 1912 * If truncating we have to clean out a portion of 1913 * the last block on-disk. We do this in the 1914 * front-end buffer cache. 1915 */ 1916 aligned_size = (vap->va_size + (blksize - 1)) & 1917 ~(int64_t)(blksize - 1); 1918 if (truncating && vap->va_size < aligned_size) { 1919 struct buf *bp; 1920 int offset; 1921 1922 aligned_size -= blksize; 1923 1924 offset = (int)vap->va_size & (blksize - 1); 1925 error = bread(ap->a_vp, aligned_size, 1926 blksize, &bp); 1927 hammer_ip_frontend_trunc(ip, aligned_size); 1928 if (error == 0) { 1929 bzero(bp->b_data + offset, 1930 blksize - offset); 1931 /* must de-cache direct-io offset */ 1932 bp->b_bio2.bio_offset = NOOFFSET; 1933 bdwrite(bp); 1934 } else { 1935 kprintf("ERROR %d\n", error); 1936 brelse(bp); 1937 } 1938 } 1939 break; 1940 case VDATABASE: 1941 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) { 1942 ip->flags |= HAMMER_INODE_TRUNCATED; 1943 ip->trunc_off = vap->va_size; 1944 } else if (ip->trunc_off > vap->va_size) { 1945 ip->trunc_off = vap->va_size; 1946 } 1947 hammer_ip_frontend_trunc(ip, vap->va_size); 1948 ip->ino_data.size = vap->va_size; 1949 modflags |= HAMMER_INODE_DDIRTY; 1950 kflags |= NOTE_ATTRIB; 1951 break; 1952 default: 1953 error = EINVAL; 1954 goto done; 1955 } 1956 break; 1957 } 1958 if (vap->va_atime.tv_sec != VNOVAL) { 1959 ip->ino_data.atime = 1960 hammer_timespec_to_time(&vap->va_atime); 1961 modflags |= HAMMER_INODE_ATIME; 1962 kflags |= NOTE_ATTRIB; 1963 } 1964 if (vap->va_mtime.tv_sec != VNOVAL) { 1965 ip->ino_data.mtime = 1966 hammer_timespec_to_time(&vap->va_mtime); 1967 modflags |= HAMMER_INODE_MTIME; 1968 kflags |= NOTE_ATTRIB; 1969 } 1970 if (vap->va_mode != (mode_t)VNOVAL) { 1971 mode_t cur_mode = ip->ino_data.mode; 1972 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid); 1973 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid); 1974 1975 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred, 1976 cur_uid, cur_gid, &cur_mode); 1977 if (error == 0 && ip->ino_data.mode != cur_mode) { 1978 ip->ino_data.mode = cur_mode; 1979 modflags |= HAMMER_INODE_DDIRTY; 1980 kflags |= NOTE_ATTRIB; 1981 } 1982 } 1983 done: 1984 if (error == 0) 1985 hammer_modify_inode(ip, modflags); 1986 hammer_done_transaction(&trans); 1987 hammer_knote(ap->a_vp, kflags); 1988 return (error); 1989 } 1990 1991 /* 1992 * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target } 1993 */ 1994 static 1995 int 1996 hammer_vop_nsymlink(struct vop_nsymlink_args *ap) 1997 { 1998 struct hammer_transaction trans; 1999 struct hammer_inode *dip; 2000 struct hammer_inode *nip; 2001 struct nchandle *nch; 2002 hammer_record_t record; 2003 int error; 2004 int bytes; 2005 2006 ap->a_vap->va_type = VLNK; 2007 2008 nch = ap->a_nch; 2009 dip = VTOI(ap->a_dvp); 2010 2011 if (dip->flags & HAMMER_INODE_RO) 2012 return (EROFS); 2013 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) 2014 return (error); 2015 2016 /* 2017 * Create a transaction to cover the operations we perform. 2018 */ 2019 hammer_start_transaction(&trans, dip->hmp); 2020 ++hammer_stats_file_iopsw; 2021 2022 /* 2023 * Create a new filesystem object of the requested type. The 2024 * returned inode will be referenced but not locked. 2025 */ 2026 2027 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, 2028 dip, NULL, &nip); 2029 if (error) { 2030 hammer_done_transaction(&trans); 2031 *ap->a_vpp = NULL; 2032 return (error); 2033 } 2034 2035 /* 2036 * Add a record representing the symlink. symlink stores the link 2037 * as pure data, not a string, and is no \0 terminated. 2038 */ 2039 if (error == 0) { 2040 bytes = strlen(ap->a_target); 2041 2042 if (bytes <= HAMMER_INODE_BASESYMLEN) { 2043 bcopy(ap->a_target, nip->ino_data.ext.symlink, bytes); 2044 } else { 2045 record = hammer_alloc_mem_record(nip, bytes); 2046 record->type = HAMMER_MEM_RECORD_GENERAL; 2047 2048 record->leaf.base.localization = nip->obj_localization + 2049 HAMMER_LOCALIZE_MISC; 2050 record->leaf.base.key = HAMMER_FIXKEY_SYMLINK; 2051 record->leaf.base.rec_type = HAMMER_RECTYPE_FIX; 2052 record->leaf.data_len = bytes; 2053 KKASSERT(HAMMER_SYMLINK_NAME_OFF == 0); 2054 bcopy(ap->a_target, record->data->symlink.name, bytes); 2055 error = hammer_ip_add_record(&trans, record); 2056 } 2057 2058 /* 2059 * Set the file size to the length of the link. 2060 */ 2061 if (error == 0) { 2062 nip->ino_data.size = bytes; 2063 hammer_modify_inode(nip, HAMMER_INODE_DDIRTY); 2064 } 2065 } 2066 if (error == 0) 2067 error = hammer_ip_add_directory(&trans, dip, nch->ncp->nc_name, 2068 nch->ncp->nc_nlen, nip); 2069 2070 /* 2071 * Finish up. 2072 */ 2073 if (error) { 2074 hammer_rel_inode(nip, 0); 2075 *ap->a_vpp = NULL; 2076 } else { 2077 error = hammer_get_vnode(nip, ap->a_vpp); 2078 hammer_rel_inode(nip, 0); 2079 if (error == 0) { 2080 cache_setunresolved(ap->a_nch); 2081 cache_setvp(ap->a_nch, *ap->a_vpp); 2082 hammer_knote(ap->a_dvp, NOTE_WRITE); 2083 } 2084 } 2085 hammer_done_transaction(&trans); 2086 return (error); 2087 } 2088 2089 /* 2090 * hammer_vop_nwhiteout { nch, dvp, cred, flags } 2091 */ 2092 static 2093 int 2094 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap) 2095 { 2096 struct hammer_transaction trans; 2097 struct hammer_inode *dip; 2098 int error; 2099 2100 dip = VTOI(ap->a_dvp); 2101 2102 if (hammer_nohistory(dip) == 0 && 2103 (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) { 2104 return (error); 2105 } 2106 2107 hammer_start_transaction(&trans, dip->hmp); 2108 ++hammer_stats_file_iopsw; 2109 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, 2110 ap->a_cred, ap->a_flags, -1); 2111 hammer_done_transaction(&trans); 2112 2113 return (error); 2114 } 2115 2116 /* 2117 * hammer_vop_ioctl { vp, command, data, fflag, cred } 2118 */ 2119 static 2120 int 2121 hammer_vop_ioctl(struct vop_ioctl_args *ap) 2122 { 2123 struct hammer_inode *ip = ap->a_vp->v_data; 2124 2125 ++hammer_stats_file_iopsr; 2126 return(hammer_ioctl(ip, ap->a_command, ap->a_data, 2127 ap->a_fflag, ap->a_cred)); 2128 } 2129 2130 static 2131 int 2132 hammer_vop_mountctl(struct vop_mountctl_args *ap) 2133 { 2134 struct mount *mp; 2135 int error; 2136 2137 mp = ap->a_head.a_ops->head.vv_mount; 2138 2139 switch(ap->a_op) { 2140 case MOUNTCTL_SET_EXPORT: 2141 if (ap->a_ctllen != sizeof(struct export_args)) 2142 error = EINVAL; 2143 else 2144 error = hammer_vfs_export(mp, ap->a_op, 2145 (const struct export_args *)ap->a_ctl); 2146 break; 2147 default: 2148 error = journal_mountctl(ap); 2149 break; 2150 } 2151 return(error); 2152 } 2153 2154 /* 2155 * hammer_vop_strategy { vp, bio } 2156 * 2157 * Strategy call, used for regular file read & write only. Note that the 2158 * bp may represent a cluster. 2159 * 2160 * To simplify operation and allow better optimizations in the future, 2161 * this code does not make any assumptions with regards to buffer alignment 2162 * or size. 2163 */ 2164 static 2165 int 2166 hammer_vop_strategy(struct vop_strategy_args *ap) 2167 { 2168 struct buf *bp; 2169 int error; 2170 2171 bp = ap->a_bio->bio_buf; 2172 2173 switch(bp->b_cmd) { 2174 case BUF_CMD_READ: 2175 error = hammer_vop_strategy_read(ap); 2176 break; 2177 case BUF_CMD_WRITE: 2178 error = hammer_vop_strategy_write(ap); 2179 break; 2180 default: 2181 bp->b_error = error = EINVAL; 2182 bp->b_flags |= B_ERROR; 2183 biodone(ap->a_bio); 2184 break; 2185 } 2186 return (error); 2187 } 2188 2189 /* 2190 * Read from a regular file. Iterate the related records and fill in the 2191 * BIO/BUF. Gaps are zero-filled. 2192 * 2193 * The support code in hammer_object.c should be used to deal with mixed 2194 * in-memory and on-disk records. 2195 * 2196 * NOTE: Can be called from the cluster code with an oversized buf. 2197 * 2198 * XXX atime update 2199 */ 2200 static 2201 int 2202 hammer_vop_strategy_read(struct vop_strategy_args *ap) 2203 { 2204 struct hammer_transaction trans; 2205 struct hammer_inode *ip; 2206 struct hammer_cursor cursor; 2207 hammer_base_elm_t base; 2208 hammer_off_t disk_offset; 2209 struct bio *bio; 2210 struct bio *nbio; 2211 struct buf *bp; 2212 int64_t rec_offset; 2213 int64_t ran_end; 2214 int64_t tmp64; 2215 int error; 2216 int boff; 2217 int roff; 2218 int n; 2219 2220 bio = ap->a_bio; 2221 bp = bio->bio_buf; 2222 ip = ap->a_vp->v_data; 2223 2224 /* 2225 * The zone-2 disk offset may have been set by the cluster code via 2226 * a BMAP operation, or else should be NOOFFSET. 2227 * 2228 * Checking the high bits for a match against zone-2 should suffice. 2229 */ 2230 nbio = push_bio(bio); 2231 if ((nbio->bio_offset & HAMMER_OFF_ZONE_MASK) == 2232 HAMMER_ZONE_LARGE_DATA) { 2233 error = hammer_io_direct_read(ip->hmp, nbio, NULL); 2234 return (error); 2235 } 2236 2237 /* 2238 * Well, that sucked. Do it the hard way. If all the stars are 2239 * aligned we may still be able to issue a direct-read. 2240 */ 2241 hammer_simple_transaction(&trans, ip->hmp); 2242 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 2243 2244 /* 2245 * Key range (begin and end inclusive) to scan. Note that the key's 2246 * stored in the actual records represent BASE+LEN, not BASE. The 2247 * first record containing bio_offset will have a key > bio_offset. 2248 */ 2249 cursor.key_beg.localization = ip->obj_localization + 2250 HAMMER_LOCALIZE_MISC; 2251 cursor.key_beg.obj_id = ip->obj_id; 2252 cursor.key_beg.create_tid = 0; 2253 cursor.key_beg.delete_tid = 0; 2254 cursor.key_beg.obj_type = 0; 2255 cursor.key_beg.key = bio->bio_offset + 1; 2256 cursor.asof = ip->obj_asof; 2257 cursor.flags |= HAMMER_CURSOR_ASOF; 2258 2259 cursor.key_end = cursor.key_beg; 2260 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE); 2261 #if 0 2262 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) { 2263 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB; 2264 cursor.key_end.rec_type = HAMMER_RECTYPE_DB; 2265 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL; 2266 } else 2267 #endif 2268 { 2269 ran_end = bio->bio_offset + bp->b_bufsize; 2270 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA; 2271 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA; 2272 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */ 2273 if (tmp64 < ran_end) 2274 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL; 2275 else 2276 cursor.key_end.key = ran_end + MAXPHYS + 1; 2277 } 2278 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE; 2279 2280 error = hammer_ip_first(&cursor); 2281 boff = 0; 2282 2283 while (error == 0) { 2284 /* 2285 * Get the base file offset of the record. The key for 2286 * data records is (base + bytes) rather then (base). 2287 */ 2288 base = &cursor.leaf->base; 2289 rec_offset = base->key - cursor.leaf->data_len; 2290 2291 /* 2292 * Calculate the gap, if any, and zero-fill it. 2293 * 2294 * n is the offset of the start of the record verses our 2295 * current seek offset in the bio. 2296 */ 2297 n = (int)(rec_offset - (bio->bio_offset + boff)); 2298 if (n > 0) { 2299 if (n > bp->b_bufsize - boff) 2300 n = bp->b_bufsize - boff; 2301 bzero((char *)bp->b_data + boff, n); 2302 boff += n; 2303 n = 0; 2304 } 2305 2306 /* 2307 * Calculate the data offset in the record and the number 2308 * of bytes we can copy. 2309 * 2310 * There are two degenerate cases. First, boff may already 2311 * be at bp->b_bufsize. Secondly, the data offset within 2312 * the record may exceed the record's size. 2313 */ 2314 roff = -n; 2315 rec_offset += roff; 2316 n = cursor.leaf->data_len - roff; 2317 if (n <= 0) { 2318 kprintf("strategy_read: bad n=%d roff=%d\n", n, roff); 2319 n = 0; 2320 } else if (n > bp->b_bufsize - boff) { 2321 n = bp->b_bufsize - boff; 2322 } 2323 2324 /* 2325 * Deal with cached truncations. This cool bit of code 2326 * allows truncate()/ftruncate() to avoid having to sync 2327 * the file. 2328 * 2329 * If the frontend is truncated then all backend records are 2330 * subject to the frontend's truncation. 2331 * 2332 * If the backend is truncated then backend records on-disk 2333 * (but not in-memory) are subject to the backend's 2334 * truncation. In-memory records owned by the backend 2335 * represent data written after the truncation point on the 2336 * backend and must not be truncated. 2337 * 2338 * Truncate operations deal with frontend buffer cache 2339 * buffers and frontend-owned in-memory records synchronously. 2340 */ 2341 if (ip->flags & HAMMER_INODE_TRUNCATED) { 2342 if (hammer_cursor_ondisk(&cursor) || 2343 cursor.iprec->flush_state == HAMMER_FST_FLUSH) { 2344 if (ip->trunc_off <= rec_offset) 2345 n = 0; 2346 else if (ip->trunc_off < rec_offset + n) 2347 n = (int)(ip->trunc_off - rec_offset); 2348 } 2349 } 2350 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 2351 if (hammer_cursor_ondisk(&cursor)) { 2352 if (ip->sync_trunc_off <= rec_offset) 2353 n = 0; 2354 else if (ip->sync_trunc_off < rec_offset + n) 2355 n = (int)(ip->sync_trunc_off - rec_offset); 2356 } 2357 } 2358 2359 /* 2360 * Try to issue a direct read into our bio if possible, 2361 * otherwise resolve the element data into a hammer_buffer 2362 * and copy. 2363 * 2364 * The buffer on-disk should be zerod past any real 2365 * truncation point, but may not be for any synthesized 2366 * truncation point from above. 2367 */ 2368 disk_offset = cursor.leaf->data_offset + roff; 2369 if (boff == 0 && n == bp->b_bufsize && 2370 hammer_cursor_ondisk(&cursor) && 2371 (disk_offset & HAMMER_BUFMASK) == 0) { 2372 KKASSERT((disk_offset & HAMMER_OFF_ZONE_MASK) == 2373 HAMMER_ZONE_LARGE_DATA); 2374 nbio->bio_offset = disk_offset; 2375 error = hammer_io_direct_read(trans.hmp, nbio, 2376 cursor.leaf); 2377 goto done; 2378 } else if (n) { 2379 error = hammer_ip_resolve_data(&cursor); 2380 if (error == 0) { 2381 bcopy((char *)cursor.data + roff, 2382 (char *)bp->b_data + boff, n); 2383 } 2384 } 2385 if (error) 2386 break; 2387 2388 /* 2389 * Iterate until we have filled the request. 2390 */ 2391 boff += n; 2392 if (boff == bp->b_bufsize) 2393 break; 2394 error = hammer_ip_next(&cursor); 2395 } 2396 2397 /* 2398 * There may have been a gap after the last record 2399 */ 2400 if (error == ENOENT) 2401 error = 0; 2402 if (error == 0 && boff != bp->b_bufsize) { 2403 KKASSERT(boff < bp->b_bufsize); 2404 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff); 2405 /* boff = bp->b_bufsize; */ 2406 } 2407 bp->b_resid = 0; 2408 bp->b_error = error; 2409 if (error) 2410 bp->b_flags |= B_ERROR; 2411 biodone(ap->a_bio); 2412 2413 done: 2414 if (cursor.node) 2415 hammer_cache_node(&ip->cache[1], cursor.node); 2416 hammer_done_cursor(&cursor); 2417 hammer_done_transaction(&trans); 2418 return(error); 2419 } 2420 2421 /* 2422 * BMAP operation - used to support cluster_read() only. 2423 * 2424 * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb) 2425 * 2426 * This routine may return EOPNOTSUPP if the opration is not supported for 2427 * the specified offset. The contents of the pointer arguments do not 2428 * need to be initialized in that case. 2429 * 2430 * If a disk address is available and properly aligned return 0 with 2431 * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately 2432 * to the run-length relative to that offset. Callers may assume that 2433 * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently 2434 * large, so return EOPNOTSUPP if it is not sufficiently large. 2435 */ 2436 static 2437 int 2438 hammer_vop_bmap(struct vop_bmap_args *ap) 2439 { 2440 struct hammer_transaction trans; 2441 struct hammer_inode *ip; 2442 struct hammer_cursor cursor; 2443 hammer_base_elm_t base; 2444 int64_t rec_offset; 2445 int64_t ran_end; 2446 int64_t tmp64; 2447 int64_t base_offset; 2448 int64_t base_disk_offset; 2449 int64_t last_offset; 2450 hammer_off_t last_disk_offset; 2451 hammer_off_t disk_offset; 2452 int rec_len; 2453 int error; 2454 int blksize; 2455 2456 ++hammer_stats_file_iopsr; 2457 ip = ap->a_vp->v_data; 2458 2459 /* 2460 * We can only BMAP regular files. We can't BMAP database files, 2461 * directories, etc. 2462 */ 2463 if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE) 2464 return(EOPNOTSUPP); 2465 2466 /* 2467 * bmap is typically called with runp/runb both NULL when used 2468 * for writing. We do not support BMAP for writing atm. 2469 */ 2470 if (ap->a_cmd != BUF_CMD_READ) 2471 return(EOPNOTSUPP); 2472 2473 /* 2474 * Scan the B-Tree to acquire blockmap addresses, then translate 2475 * to raw addresses. 2476 */ 2477 hammer_simple_transaction(&trans, ip->hmp); 2478 #if 0 2479 kprintf("bmap_beg %016llx ip->cache %p\n", ap->a_loffset, ip->cache[1]); 2480 #endif 2481 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); 2482 2483 /* 2484 * Key range (begin and end inclusive) to scan. Note that the key's 2485 * stored in the actual records represent BASE+LEN, not BASE. The 2486 * first record containing bio_offset will have a key > bio_offset. 2487 */ 2488 cursor.key_beg.localization = ip->obj_localization + 2489 HAMMER_LOCALIZE_MISC; 2490 cursor.key_beg.obj_id = ip->obj_id; 2491 cursor.key_beg.create_tid = 0; 2492 cursor.key_beg.delete_tid = 0; 2493 cursor.key_beg.obj_type = 0; 2494 if (ap->a_runb) 2495 cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1; 2496 else 2497 cursor.key_beg.key = ap->a_loffset + 1; 2498 if (cursor.key_beg.key < 0) 2499 cursor.key_beg.key = 0; 2500 cursor.asof = ip->obj_asof; 2501 cursor.flags |= HAMMER_CURSOR_ASOF; 2502 2503 cursor.key_end = cursor.key_beg; 2504 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE); 2505 2506 ran_end = ap->a_loffset + MAXPHYS; 2507 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA; 2508 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA; 2509 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */ 2510 if (tmp64 < ran_end) 2511 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL; 2512 else 2513 cursor.key_end.key = ran_end + MAXPHYS + 1; 2514 2515 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE; 2516 2517 error = hammer_ip_first(&cursor); 2518 base_offset = last_offset = 0; 2519 base_disk_offset = last_disk_offset = 0; 2520 2521 while (error == 0) { 2522 /* 2523 * Get the base file offset of the record. The key for 2524 * data records is (base + bytes) rather then (base). 2525 * 2526 * NOTE: rec_offset + rec_len may exceed the end-of-file. 2527 * The extra bytes should be zero on-disk and the BMAP op 2528 * should still be ok. 2529 */ 2530 base = &cursor.leaf->base; 2531 rec_offset = base->key - cursor.leaf->data_len; 2532 rec_len = cursor.leaf->data_len; 2533 2534 /* 2535 * Incorporate any cached truncation. 2536 * 2537 * NOTE: Modifications to rec_len based on synthesized 2538 * truncation points remove the guarantee that any extended 2539 * data on disk is zero (since the truncations may not have 2540 * taken place on-media yet). 2541 */ 2542 if (ip->flags & HAMMER_INODE_TRUNCATED) { 2543 if (hammer_cursor_ondisk(&cursor) || 2544 cursor.iprec->flush_state == HAMMER_FST_FLUSH) { 2545 if (ip->trunc_off <= rec_offset) 2546 rec_len = 0; 2547 else if (ip->trunc_off < rec_offset + rec_len) 2548 rec_len = (int)(ip->trunc_off - rec_offset); 2549 } 2550 } 2551 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 2552 if (hammer_cursor_ondisk(&cursor)) { 2553 if (ip->sync_trunc_off <= rec_offset) 2554 rec_len = 0; 2555 else if (ip->sync_trunc_off < rec_offset + rec_len) 2556 rec_len = (int)(ip->sync_trunc_off - rec_offset); 2557 } 2558 } 2559 2560 /* 2561 * Accumulate information. If we have hit a discontiguous 2562 * block reset base_offset unless we are already beyond the 2563 * requested offset. If we are, that's it, we stop. 2564 */ 2565 if (error) 2566 break; 2567 if (hammer_cursor_ondisk(&cursor)) { 2568 disk_offset = cursor.leaf->data_offset; 2569 if (rec_offset != last_offset || 2570 disk_offset != last_disk_offset) { 2571 if (rec_offset > ap->a_loffset) 2572 break; 2573 base_offset = rec_offset; 2574 base_disk_offset = disk_offset; 2575 } 2576 last_offset = rec_offset + rec_len; 2577 last_disk_offset = disk_offset + rec_len; 2578 } 2579 error = hammer_ip_next(&cursor); 2580 } 2581 2582 #if 0 2583 kprintf("BMAP %016llx: %016llx - %016llx\n", 2584 ap->a_loffset, base_offset, last_offset); 2585 kprintf("BMAP %16s: %016llx - %016llx\n", 2586 "", base_disk_offset, last_disk_offset); 2587 #endif 2588 2589 if (cursor.node) { 2590 hammer_cache_node(&ip->cache[1], cursor.node); 2591 #if 0 2592 kprintf("bmap_end2 %016llx ip->cache %p\n", ap->a_loffset, ip->cache[1]); 2593 #endif 2594 } 2595 hammer_done_cursor(&cursor); 2596 hammer_done_transaction(&trans); 2597 2598 /* 2599 * If we couldn't find any records or the records we did find were 2600 * all behind the requested offset, return failure. A forward 2601 * truncation can leave a hole w/ no on-disk records. 2602 */ 2603 if (last_offset == 0 || last_offset < ap->a_loffset) 2604 return (EOPNOTSUPP); 2605 2606 /* 2607 * Figure out the block size at the requested offset and adjust 2608 * our limits so the cluster_read() does not create inappropriately 2609 * sized buffer cache buffers. 2610 */ 2611 blksize = hammer_blocksize(ap->a_loffset); 2612 if (hammer_blocksize(base_offset) != blksize) { 2613 base_offset = hammer_blockdemarc(base_offset, ap->a_loffset); 2614 } 2615 if (last_offset != ap->a_loffset && 2616 hammer_blocksize(last_offset - 1) != blksize) { 2617 last_offset = hammer_blockdemarc(ap->a_loffset, 2618 last_offset - 1); 2619 } 2620 2621 /* 2622 * Returning EOPNOTSUPP simply prevents the direct-IO optimization 2623 * from occuring. 2624 */ 2625 disk_offset = base_disk_offset + (ap->a_loffset - base_offset); 2626 2627 if ((disk_offset & HAMMER_OFF_ZONE_MASK) != HAMMER_ZONE_LARGE_DATA) { 2628 /* 2629 * Only large-data zones can be direct-IOd 2630 */ 2631 error = EOPNOTSUPP; 2632 } else if ((disk_offset & HAMMER_BUFMASK) || 2633 (last_offset - ap->a_loffset) < blksize) { 2634 /* 2635 * doffsetp is not aligned or the forward run size does 2636 * not cover a whole buffer, disallow the direct I/O. 2637 */ 2638 error = EOPNOTSUPP; 2639 } else { 2640 /* 2641 * We're good. 2642 */ 2643 *ap->a_doffsetp = disk_offset; 2644 if (ap->a_runb) { 2645 *ap->a_runb = ap->a_loffset - base_offset; 2646 KKASSERT(*ap->a_runb >= 0); 2647 } 2648 if (ap->a_runp) { 2649 *ap->a_runp = last_offset - ap->a_loffset; 2650 KKASSERT(*ap->a_runp >= 0); 2651 } 2652 error = 0; 2653 } 2654 return(error); 2655 } 2656 2657 /* 2658 * Write to a regular file. Because this is a strategy call the OS is 2659 * trying to actually get data onto the media. 2660 */ 2661 static 2662 int 2663 hammer_vop_strategy_write(struct vop_strategy_args *ap) 2664 { 2665 hammer_record_t record; 2666 hammer_mount_t hmp; 2667 hammer_inode_t ip; 2668 struct bio *bio; 2669 struct buf *bp; 2670 int blksize; 2671 int bytes; 2672 int error; 2673 2674 bio = ap->a_bio; 2675 bp = bio->bio_buf; 2676 ip = ap->a_vp->v_data; 2677 hmp = ip->hmp; 2678 2679 blksize = hammer_blocksize(bio->bio_offset); 2680 KKASSERT(bp->b_bufsize == blksize); 2681 2682 if (ip->flags & HAMMER_INODE_RO) { 2683 bp->b_error = EROFS; 2684 bp->b_flags |= B_ERROR; 2685 biodone(ap->a_bio); 2686 return(EROFS); 2687 } 2688 2689 /* 2690 * Interlock with inode destruction (no in-kernel or directory 2691 * topology visibility). If we queue new IO while trying to 2692 * destroy the inode we can deadlock the vtrunc call in 2693 * hammer_inode_unloadable_check(). 2694 * 2695 * Besides, there's no point flushing a bp associated with an 2696 * inode that is being destroyed on-media and has no kernel 2697 * references. 2698 */ 2699 if ((ip->flags | ip->sync_flags) & 2700 (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) { 2701 bp->b_resid = 0; 2702 biodone(ap->a_bio); 2703 return(0); 2704 } 2705 2706 /* 2707 * Reserve space and issue a direct-write from the front-end. 2708 * NOTE: The direct_io code will hammer_bread/bcopy smaller 2709 * allocations. 2710 * 2711 * An in-memory record will be installed to reference the storage 2712 * until the flusher can get to it. 2713 * 2714 * Since we own the high level bio the front-end will not try to 2715 * do a direct-read until the write completes. 2716 * 2717 * NOTE: The only time we do not reserve a full-sized buffers 2718 * worth of data is if the file is small. We do not try to 2719 * allocate a fragment (from the small-data zone) at the end of 2720 * an otherwise large file as this can lead to wildly separated 2721 * data. 2722 */ 2723 KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0); 2724 KKASSERT(bio->bio_offset < ip->ino_data.size); 2725 if (bio->bio_offset || ip->ino_data.size > HAMMER_BUFSIZE / 2) 2726 bytes = bp->b_bufsize; 2727 else 2728 bytes = ((int)ip->ino_data.size + 15) & ~15; 2729 2730 record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data, 2731 bytes, &error); 2732 if (record) { 2733 hammer_io_direct_write(hmp, record, bio); 2734 if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs) 2735 hammer_flush_inode(ip, 0); 2736 } else { 2737 bp->b_bio2.bio_offset = NOOFFSET; 2738 bp->b_error = error; 2739 bp->b_flags |= B_ERROR; 2740 biodone(ap->a_bio); 2741 } 2742 return(error); 2743 } 2744 2745 /* 2746 * dounlink - disconnect a directory entry 2747 * 2748 * XXX whiteout support not really in yet 2749 */ 2750 static int 2751 hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch, 2752 struct vnode *dvp, struct ucred *cred, 2753 int flags, int isdir) 2754 { 2755 struct namecache *ncp; 2756 hammer_inode_t dip; 2757 hammer_inode_t ip; 2758 struct hammer_cursor cursor; 2759 int64_t namekey; 2760 u_int32_t max_iterations; 2761 int nlen, error; 2762 2763 /* 2764 * Calculate the namekey and setup the key range for the scan. This 2765 * works kinda like a chained hash table where the lower 32 bits 2766 * of the namekey synthesize the chain. 2767 * 2768 * The key range is inclusive of both key_beg and key_end. 2769 */ 2770 dip = VTOI(dvp); 2771 ncp = nch->ncp; 2772 2773 if (dip->flags & HAMMER_INODE_RO) 2774 return (EROFS); 2775 2776 namekey = hammer_directory_namekey(dip, ncp->nc_name, ncp->nc_nlen, 2777 &max_iterations); 2778 retry: 2779 hammer_init_cursor(trans, &cursor, &dip->cache[1], dip); 2780 cursor.key_beg.localization = dip->obj_localization + 2781 HAMMER_LOCALIZE_MISC; 2782 cursor.key_beg.obj_id = dip->obj_id; 2783 cursor.key_beg.key = namekey; 2784 cursor.key_beg.create_tid = 0; 2785 cursor.key_beg.delete_tid = 0; 2786 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; 2787 cursor.key_beg.obj_type = 0; 2788 2789 cursor.key_end = cursor.key_beg; 2790 cursor.key_end.key += max_iterations; 2791 cursor.asof = dip->obj_asof; 2792 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 2793 2794 /* 2795 * Scan all matching records (the chain), locate the one matching 2796 * the requested path component. info->last_error contains the 2797 * error code on search termination and could be 0, ENOENT, or 2798 * something else. 2799 * 2800 * The hammer_ip_*() functions merge in-memory records with on-disk 2801 * records for the purposes of the search. 2802 */ 2803 error = hammer_ip_first(&cursor); 2804 2805 while (error == 0) { 2806 error = hammer_ip_resolve_data(&cursor); 2807 if (error) 2808 break; 2809 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF; 2810 KKASSERT(nlen > 0); 2811 if (ncp->nc_nlen == nlen && 2812 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) { 2813 break; 2814 } 2815 error = hammer_ip_next(&cursor); 2816 } 2817 2818 /* 2819 * If all is ok we have to get the inode so we can adjust nlinks. 2820 * To avoid a deadlock with the flusher we must release the inode 2821 * lock on the directory when acquiring the inode for the entry. 2822 * 2823 * If the target is a directory, it must be empty. 2824 */ 2825 if (error == 0) { 2826 hammer_unlock(&cursor.ip->lock); 2827 ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id, 2828 dip->hmp->asof, 2829 cursor.data->entry.localization, 2830 0, &error); 2831 hammer_lock_sh(&cursor.ip->lock); 2832 if (error == ENOENT) { 2833 kprintf("HAMMER: WARNING: Removing " 2834 "dirent w/missing inode \"%s\"\n" 2835 "\tobj_id = %016llx\n", 2836 ncp->nc_name, 2837 (long long)cursor.data->entry.obj_id); 2838 error = 0; 2839 } 2840 2841 /* 2842 * If isdir >= 0 we validate that the entry is or is not a 2843 * directory. If isdir < 0 we don't care. 2844 */ 2845 if (error == 0 && isdir >= 0 && ip) { 2846 if (isdir && 2847 ip->ino_data.obj_type != HAMMER_OBJTYPE_DIRECTORY) { 2848 error = ENOTDIR; 2849 } else if (isdir == 0 && 2850 ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY) { 2851 error = EISDIR; 2852 } 2853 } 2854 2855 /* 2856 * If we are trying to remove a directory the directory must 2857 * be empty. 2858 * 2859 * The check directory code can loop and deadlock/retry. Our 2860 * own cursor's node locks must be released to avoid a 3-way 2861 * deadlock with the flusher if the check directory code 2862 * blocks. 2863 * 2864 * If any changes whatsoever have been made to the cursor 2865 * set EDEADLK and retry. 2866 */ 2867 if (error == 0 && ip && ip->ino_data.obj_type == 2868 HAMMER_OBJTYPE_DIRECTORY) { 2869 hammer_unlock_cursor(&cursor); 2870 error = hammer_ip_check_directory_empty(trans, ip); 2871 hammer_lock_cursor(&cursor); 2872 if (cursor.flags & HAMMER_CURSOR_RETEST) { 2873 kprintf("HAMMER: Warning: avoided deadlock " 2874 "on rmdir '%s'\n", 2875 ncp->nc_name); 2876 error = EDEADLK; 2877 } 2878 } 2879 2880 /* 2881 * Delete the directory entry. 2882 * 2883 * WARNING: hammer_ip_del_directory() may have to terminate 2884 * the cursor to avoid a deadlock. It is ok to call 2885 * hammer_done_cursor() twice. 2886 */ 2887 if (error == 0) { 2888 error = hammer_ip_del_directory(trans, &cursor, 2889 dip, ip); 2890 } 2891 hammer_done_cursor(&cursor); 2892 if (error == 0) { 2893 cache_setunresolved(nch); 2894 cache_setvp(nch, NULL); 2895 /* XXX locking */ 2896 if (ip && ip->vp) { 2897 hammer_knote(ip->vp, NOTE_DELETE); 2898 cache_inval_vp(ip->vp, CINV_DESTROY); 2899 } 2900 } 2901 if (ip) 2902 hammer_rel_inode(ip, 0); 2903 } else { 2904 hammer_done_cursor(&cursor); 2905 } 2906 if (error == EDEADLK) 2907 goto retry; 2908 2909 return (error); 2910 } 2911 2912 /************************************************************************ 2913 * FIFO AND SPECFS OPS * 2914 ************************************************************************ 2915 * 2916 */ 2917 2918 static int 2919 hammer_vop_fifoclose (struct vop_close_args *ap) 2920 { 2921 /* XXX update itimes */ 2922 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 2923 } 2924 2925 static int 2926 hammer_vop_fiforead (struct vop_read_args *ap) 2927 { 2928 int error; 2929 2930 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 2931 /* XXX update access time */ 2932 return (error); 2933 } 2934 2935 static int 2936 hammer_vop_fifowrite (struct vop_write_args *ap) 2937 { 2938 int error; 2939 2940 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 2941 /* XXX update access time */ 2942 return (error); 2943 } 2944 2945 static 2946 int 2947 hammer_vop_fifokqfilter(struct vop_kqfilter_args *ap) 2948 { 2949 int error; 2950 2951 error = VOCALL(&fifo_vnode_vops, &ap->a_head); 2952 if (error) 2953 error = hammer_vop_kqfilter(ap); 2954 return(error); 2955 } 2956 2957 static int 2958 hammer_vop_specclose (struct vop_close_args *ap) 2959 { 2960 /* XXX update itimes */ 2961 return (VOCALL(&spec_vnode_vops, &ap->a_head)); 2962 } 2963 2964 static int 2965 hammer_vop_specread (struct vop_read_args *ap) 2966 { 2967 /* XXX update access time */ 2968 return (VOCALL(&spec_vnode_vops, &ap->a_head)); 2969 } 2970 2971 static int 2972 hammer_vop_specwrite (struct vop_write_args *ap) 2973 { 2974 /* XXX update last change time */ 2975 return (VOCALL(&spec_vnode_vops, &ap->a_head)); 2976 } 2977 2978 /************************************************************************ 2979 * KQFILTER OPS * 2980 ************************************************************************ 2981 * 2982 */ 2983 static void filt_hammerdetach(struct knote *kn); 2984 static int filt_hammerread(struct knote *kn, long hint); 2985 static int filt_hammerwrite(struct knote *kn, long hint); 2986 static int filt_hammervnode(struct knote *kn, long hint); 2987 2988 static struct filterops hammerread_filtops = 2989 { 1, NULL, filt_hammerdetach, filt_hammerread }; 2990 static struct filterops hammerwrite_filtops = 2991 { 1, NULL, filt_hammerdetach, filt_hammerwrite }; 2992 static struct filterops hammervnode_filtops = 2993 { 1, NULL, filt_hammerdetach, filt_hammervnode }; 2994 2995 static 2996 int 2997 hammer_vop_kqfilter(struct vop_kqfilter_args *ap) 2998 { 2999 struct vnode *vp = ap->a_vp; 3000 struct knote *kn = ap->a_kn; 3001 lwkt_tokref ilock; 3002 3003 switch (kn->kn_filter) { 3004 case EVFILT_READ: 3005 kn->kn_fop = &hammerread_filtops; 3006 break; 3007 case EVFILT_WRITE: 3008 kn->kn_fop = &hammerwrite_filtops; 3009 break; 3010 case EVFILT_VNODE: 3011 kn->kn_fop = &hammervnode_filtops; 3012 break; 3013 default: 3014 return (1); 3015 } 3016 3017 kn->kn_hook = (caddr_t)vp; 3018 3019 lwkt_gettoken(&ilock, &vp->v_pollinfo.vpi_token); 3020 SLIST_INSERT_HEAD(&vp->v_pollinfo.vpi_selinfo.si_note, kn, kn_selnext); 3021 lwkt_reltoken(&ilock); 3022 3023 return(0); 3024 } 3025 3026 static void 3027 filt_hammerdetach(struct knote *kn) 3028 { 3029 struct vnode *vp = (void *)kn->kn_hook; 3030 lwkt_tokref ilock; 3031 3032 lwkt_gettoken(&ilock, &vp->v_pollinfo.vpi_token); 3033 SLIST_REMOVE(&vp->v_pollinfo.vpi_selinfo.si_note, 3034 kn, knote, kn_selnext); 3035 lwkt_reltoken(&ilock); 3036 } 3037 3038 static int 3039 filt_hammerread(struct knote *kn, long hint) 3040 { 3041 struct vnode *vp = (void *)kn->kn_hook; 3042 hammer_inode_t ip = VTOI(vp); 3043 3044 if (hint == NOTE_REVOKE) { 3045 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 3046 return(1); 3047 } 3048 kn->kn_data = ip->ino_data.size - kn->kn_fp->f_offset; 3049 return (kn->kn_data != 0); 3050 } 3051 3052 static int 3053 filt_hammerwrite(struct knote *kn, long hint) 3054 { 3055 if (hint == NOTE_REVOKE) 3056 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 3057 kn->kn_data = 0; 3058 return (1); 3059 } 3060 3061 static int 3062 filt_hammervnode(struct knote *kn, long hint) 3063 { 3064 if (kn->kn_sfflags & hint) 3065 kn->kn_fflags |= hint; 3066 if (hint == NOTE_REVOKE) { 3067 kn->kn_flags |= EV_EOF; 3068 return (1); 3069 } 3070 return (kn->kn_fflags != 0); 3071 } 3072 3073