1 /* $NetBSD: ffs_vnops.c,v 1.49 2002/05/05 17:00:06 chs Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 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 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)ffs_vnops.c 8.15 (Berkeley) 5/14/95 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: ffs_vnops.c,v 1.49 2002/05/05 17:00:06 chs Exp $"); 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/resourcevar.h> 44 #include <sys/kernel.h> 45 #include <sys/file.h> 46 #include <sys/stat.h> 47 #include <sys/buf.h> 48 #include <sys/proc.h> 49 #include <sys/mount.h> 50 #include <sys/vnode.h> 51 #include <sys/pool.h> 52 #include <sys/signalvar.h> 53 54 #include <miscfs/fifofs/fifo.h> 55 #include <miscfs/genfs/genfs.h> 56 #include <miscfs/specfs/specdev.h> 57 58 #include <ufs/ufs/inode.h> 59 #include <ufs/ufs/dir.h> 60 #include <ufs/ufs/ufs_extern.h> 61 #include <ufs/ufs/ufsmount.h> 62 63 #include <ufs/ffs/fs.h> 64 #include <ufs/ffs/ffs_extern.h> 65 66 #include <uvm/uvm.h> 67 68 static int ffs_full_fsync __P((void *)); 69 70 /* Global vfs data structures for ufs. */ 71 int (**ffs_vnodeop_p) __P((void *)); 72 const struct vnodeopv_entry_desc ffs_vnodeop_entries[] = { 73 { &vop_default_desc, vn_default_error }, 74 { &vop_lookup_desc, ufs_lookup }, /* lookup */ 75 { &vop_create_desc, ufs_create }, /* create */ 76 { &vop_whiteout_desc, ufs_whiteout }, /* whiteout */ 77 { &vop_mknod_desc, ufs_mknod }, /* mknod */ 78 { &vop_open_desc, ufs_open }, /* open */ 79 { &vop_close_desc, ufs_close }, /* close */ 80 { &vop_access_desc, ufs_access }, /* access */ 81 { &vop_getattr_desc, ufs_getattr }, /* getattr */ 82 { &vop_setattr_desc, ufs_setattr }, /* setattr */ 83 { &vop_read_desc, ffs_read }, /* read */ 84 { &vop_write_desc, ffs_write }, /* write */ 85 { &vop_lease_desc, ufs_lease_check }, /* lease */ 86 { &vop_ioctl_desc, ufs_ioctl }, /* ioctl */ 87 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 88 { &vop_poll_desc, ufs_poll }, /* poll */ 89 { &vop_revoke_desc, ufs_revoke }, /* revoke */ 90 { &vop_mmap_desc, ufs_mmap }, /* mmap */ 91 { &vop_fsync_desc, ffs_fsync }, /* fsync */ 92 { &vop_seek_desc, ufs_seek }, /* seek */ 93 { &vop_remove_desc, ufs_remove }, /* remove */ 94 { &vop_link_desc, ufs_link }, /* link */ 95 { &vop_rename_desc, ufs_rename }, /* rename */ 96 { &vop_mkdir_desc, ufs_mkdir }, /* mkdir */ 97 { &vop_rmdir_desc, ufs_rmdir }, /* rmdir */ 98 { &vop_symlink_desc, ufs_symlink }, /* symlink */ 99 { &vop_readdir_desc, ufs_readdir }, /* readdir */ 100 { &vop_readlink_desc, ufs_readlink }, /* readlink */ 101 { &vop_abortop_desc, ufs_abortop }, /* abortop */ 102 { &vop_inactive_desc, ufs_inactive }, /* inactive */ 103 { &vop_reclaim_desc, ffs_reclaim }, /* reclaim */ 104 { &vop_lock_desc, ufs_lock }, /* lock */ 105 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 106 { &vop_bmap_desc, ufs_bmap }, /* bmap */ 107 { &vop_strategy_desc, ufs_strategy }, /* strategy */ 108 { &vop_print_desc, ufs_print }, /* print */ 109 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 110 { &vop_pathconf_desc, ufs_pathconf }, /* pathconf */ 111 { &vop_advlock_desc, ufs_advlock }, /* advlock */ 112 { &vop_blkatoff_desc, ffs_blkatoff }, /* blkatoff */ 113 { &vop_valloc_desc, ffs_valloc }, /* valloc */ 114 { &vop_balloc_desc, ffs_balloc }, /* balloc */ 115 { &vop_reallocblks_desc, ffs_reallocblks }, /* reallocblks */ 116 { &vop_vfree_desc, ffs_vfree }, /* vfree */ 117 { &vop_truncate_desc, ffs_truncate }, /* truncate */ 118 { &vop_update_desc, ffs_update }, /* update */ 119 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 120 { &vop_getpages_desc, ffs_getpages }, /* getpages */ 121 { &vop_putpages_desc, ffs_putpages }, /* putpages */ 122 { NULL, NULL } 123 }; 124 const struct vnodeopv_desc ffs_vnodeop_opv_desc = 125 { &ffs_vnodeop_p, ffs_vnodeop_entries }; 126 127 int (**ffs_specop_p) __P((void *)); 128 const struct vnodeopv_entry_desc ffs_specop_entries[] = { 129 { &vop_default_desc, vn_default_error }, 130 { &vop_lookup_desc, spec_lookup }, /* lookup */ 131 { &vop_create_desc, spec_create }, /* create */ 132 { &vop_mknod_desc, spec_mknod }, /* mknod */ 133 { &vop_open_desc, spec_open }, /* open */ 134 { &vop_close_desc, ufsspec_close }, /* close */ 135 { &vop_access_desc, ufs_access }, /* access */ 136 { &vop_getattr_desc, ufs_getattr }, /* getattr */ 137 { &vop_setattr_desc, ufs_setattr }, /* setattr */ 138 { &vop_read_desc, ufsspec_read }, /* read */ 139 { &vop_write_desc, ufsspec_write }, /* write */ 140 { &vop_lease_desc, spec_lease_check }, /* lease */ 141 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 142 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 143 { &vop_poll_desc, spec_poll }, /* poll */ 144 { &vop_revoke_desc, spec_revoke }, /* revoke */ 145 { &vop_mmap_desc, spec_mmap }, /* mmap */ 146 { &vop_fsync_desc, ffs_fsync }, /* fsync */ 147 { &vop_seek_desc, spec_seek }, /* seek */ 148 { &vop_remove_desc, spec_remove }, /* remove */ 149 { &vop_link_desc, spec_link }, /* link */ 150 { &vop_rename_desc, spec_rename }, /* rename */ 151 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 152 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 153 { &vop_symlink_desc, spec_symlink }, /* symlink */ 154 { &vop_readdir_desc, spec_readdir }, /* readdir */ 155 { &vop_readlink_desc, spec_readlink }, /* readlink */ 156 { &vop_abortop_desc, spec_abortop }, /* abortop */ 157 { &vop_inactive_desc, ufs_inactive }, /* inactive */ 158 { &vop_reclaim_desc, ffs_reclaim }, /* reclaim */ 159 { &vop_lock_desc, ufs_lock }, /* lock */ 160 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 161 { &vop_bmap_desc, spec_bmap }, /* bmap */ 162 { &vop_strategy_desc, spec_strategy }, /* strategy */ 163 { &vop_print_desc, ufs_print }, /* print */ 164 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 165 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 166 { &vop_advlock_desc, spec_advlock }, /* advlock */ 167 { &vop_blkatoff_desc, spec_blkatoff }, /* blkatoff */ 168 { &vop_valloc_desc, spec_valloc }, /* valloc */ 169 { &vop_reallocblks_desc, spec_reallocblks }, /* reallocblks */ 170 { &vop_vfree_desc, ffs_vfree }, /* vfree */ 171 { &vop_truncate_desc, spec_truncate }, /* truncate */ 172 { &vop_update_desc, ffs_update }, /* update */ 173 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 174 { &vop_getpages_desc, spec_getpages }, /* getpages */ 175 { &vop_putpages_desc, spec_putpages }, /* putpages */ 176 { NULL, NULL } 177 }; 178 const struct vnodeopv_desc ffs_specop_opv_desc = 179 { &ffs_specop_p, ffs_specop_entries }; 180 181 int (**ffs_fifoop_p) __P((void *)); 182 const struct vnodeopv_entry_desc ffs_fifoop_entries[] = { 183 { &vop_default_desc, vn_default_error }, 184 { &vop_lookup_desc, fifo_lookup }, /* lookup */ 185 { &vop_create_desc, fifo_create }, /* create */ 186 { &vop_mknod_desc, fifo_mknod }, /* mknod */ 187 { &vop_open_desc, fifo_open }, /* open */ 188 { &vop_close_desc, ufsfifo_close }, /* close */ 189 { &vop_access_desc, ufs_access }, /* access */ 190 { &vop_getattr_desc, ufs_getattr }, /* getattr */ 191 { &vop_setattr_desc, ufs_setattr }, /* setattr */ 192 { &vop_read_desc, ufsfifo_read }, /* read */ 193 { &vop_write_desc, ufsfifo_write }, /* write */ 194 { &vop_lease_desc, fifo_lease_check }, /* lease */ 195 { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ 196 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 197 { &vop_poll_desc, fifo_poll }, /* poll */ 198 { &vop_revoke_desc, fifo_revoke }, /* revoke */ 199 { &vop_mmap_desc, fifo_mmap }, /* mmap */ 200 { &vop_fsync_desc, ffs_fsync }, /* fsync */ 201 { &vop_seek_desc, fifo_seek }, /* seek */ 202 { &vop_remove_desc, fifo_remove }, /* remove */ 203 { &vop_link_desc, fifo_link }, /* link */ 204 { &vop_rename_desc, fifo_rename }, /* rename */ 205 { &vop_mkdir_desc, fifo_mkdir }, /* mkdir */ 206 { &vop_rmdir_desc, fifo_rmdir }, /* rmdir */ 207 { &vop_symlink_desc, fifo_symlink }, /* symlink */ 208 { &vop_readdir_desc, fifo_readdir }, /* readdir */ 209 { &vop_readlink_desc, fifo_readlink }, /* readlink */ 210 { &vop_abortop_desc, fifo_abortop }, /* abortop */ 211 { &vop_inactive_desc, ufs_inactive }, /* inactive */ 212 { &vop_reclaim_desc, ffs_reclaim }, /* reclaim */ 213 { &vop_lock_desc, ufs_lock }, /* lock */ 214 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 215 { &vop_bmap_desc, fifo_bmap }, /* bmap */ 216 { &vop_strategy_desc, fifo_strategy }, /* strategy */ 217 { &vop_print_desc, ufs_print }, /* print */ 218 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 219 { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */ 220 { &vop_advlock_desc, fifo_advlock }, /* advlock */ 221 { &vop_blkatoff_desc, fifo_blkatoff }, /* blkatoff */ 222 { &vop_valloc_desc, fifo_valloc }, /* valloc */ 223 { &vop_reallocblks_desc, fifo_reallocblks }, /* reallocblks */ 224 { &vop_vfree_desc, ffs_vfree }, /* vfree */ 225 { &vop_truncate_desc, fifo_truncate }, /* truncate */ 226 { &vop_update_desc, ffs_update }, /* update */ 227 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 228 { &vop_putpages_desc, fifo_putpages }, /* putpages */ 229 { NULL, NULL } 230 }; 231 const struct vnodeopv_desc ffs_fifoop_opv_desc = 232 { &ffs_fifoop_p, ffs_fifoop_entries }; 233 234 int doclusterread = 1; 235 int doclusterwrite = 1; 236 237 #include <ufs/ufs/ufs_readwrite.c> 238 239 int 240 ffs_fsync(v) 241 void *v; 242 { 243 struct vop_fsync_args /* { 244 struct vnode *a_vp; 245 struct ucred *a_cred; 246 int a_flags; 247 off_t a_offlo; 248 off_t a_offhi; 249 struct proc *a_p; 250 } */ *ap = v; 251 struct buf *bp; 252 int s, num, error, i; 253 struct indir ia[NIADDR + 1]; 254 int bsize; 255 daddr_t blk_high; 256 struct vnode *vp; 257 258 /* 259 * XXX no easy way to sync a range in a file with softdep. 260 */ 261 if ((ap->a_offlo == 0 && ap->a_offhi == 0) || DOINGSOFTDEP(ap->a_vp)) 262 return ffs_full_fsync(v); 263 264 vp = ap->a_vp; 265 266 bsize = ap->a_vp->v_mount->mnt_stat.f_iosize; 267 blk_high = ap->a_offhi / bsize; 268 if (ap->a_offhi % bsize != 0) 269 blk_high++; 270 271 /* 272 * First, flush all pages in range. 273 */ 274 275 if (vp->v_type == VREG) { 276 simple_lock(&vp->v_interlock); 277 error = VOP_PUTPAGES(vp, trunc_page(ap->a_offlo), 278 round_page(ap->a_offhi), PGO_CLEANIT|PGO_SYNCIO); 279 if (error) { 280 return error; 281 } 282 } 283 284 /* 285 * Then, flush indirect blocks. 286 */ 287 288 s = splbio(); 289 if (!(ap->a_flags & FSYNC_DATAONLY) && blk_high >= NDADDR) { 290 error = ufs_getlbns(vp, blk_high, ia, &num); 291 if (error) { 292 splx(s); 293 return error; 294 } 295 for (i = 0; i < num; i++) { 296 bp = incore(vp, ia[i].in_lbn); 297 if (bp != NULL && !(bp->b_flags & B_BUSY) && 298 (bp->b_flags & B_DELWRI)) { 299 bp->b_flags |= B_BUSY | B_VFLUSH; 300 splx(s); 301 bawrite(bp); 302 s = splbio(); 303 } 304 } 305 } 306 307 if (ap->a_flags & FSYNC_WAIT) { 308 while (vp->v_numoutput > 0) { 309 vp->v_flag |= VBWAIT; 310 tsleep(&vp->v_numoutput, PRIBIO + 1, "fsync_range", 0); 311 } 312 } 313 splx(s); 314 315 return (VOP_UPDATE(vp, NULL, NULL, 316 (ap->a_flags & FSYNC_WAIT) ? UPDATE_WAIT : 0)); 317 } 318 319 /* 320 * Synch an open file. 321 */ 322 /* ARGSUSED */ 323 static int 324 ffs_full_fsync(v) 325 void *v; 326 { 327 struct vop_fsync_args /* { 328 struct vnode *a_vp; 329 struct ucred *a_cred; 330 int a_flags; 331 off_t a_offlo; 332 off_t a_offhi; 333 struct proc *a_p; 334 } */ *ap = v; 335 struct vnode *vp = ap->a_vp; 336 struct buf *bp, *nbp; 337 int s, error, passes, skipmeta, inodedeps_only, waitfor; 338 339 if (vp->v_type == VBLK && 340 vp->v_specmountpoint != NULL && 341 (vp->v_specmountpoint->mnt_flag & MNT_SOFTDEP)) 342 softdep_fsync_mountdev(vp); 343 344 inodedeps_only = DOINGSOFTDEP(vp) && (ap->a_flags & FSYNC_RECLAIM) 345 && vp->v_uobj.uo_npages == 0 && LIST_EMPTY(&vp->v_dirtyblkhd); 346 347 /* 348 * Flush all dirty data associated with a vnode. 349 */ 350 351 if (vp->v_type == VREG) { 352 simple_lock(&vp->v_interlock); 353 error = VOP_PUTPAGES(vp, 0, 0, PGO_ALLPAGES | PGO_CLEANIT | 354 ((ap->a_flags & FSYNC_WAIT) ? PGO_SYNCIO : 0)); 355 if (error) { 356 return error; 357 } 358 } 359 360 passes = NIADDR + 1; 361 skipmeta = 0; 362 if (ap->a_flags & (FSYNC_DATAONLY|FSYNC_WAIT)) 363 skipmeta = 1; 364 s = splbio(); 365 366 loop: 367 LIST_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs) 368 bp->b_flags &= ~B_SCANNED; 369 for (bp = LIST_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 370 nbp = LIST_NEXT(bp, b_vnbufs); 371 if (bp->b_flags & (B_BUSY | B_SCANNED)) 372 continue; 373 if ((bp->b_flags & B_DELWRI) == 0) 374 panic("ffs_fsync: not dirty"); 375 if (skipmeta && bp->b_lblkno < 0) 376 continue; 377 bp->b_flags |= B_BUSY | B_VFLUSH | B_SCANNED; 378 splx(s); 379 /* 380 * On our final pass through, do all I/O synchronously 381 * so that we can find out if our flush is failing 382 * because of write errors. 383 */ 384 if (passes > 0 || !(ap->a_flags & FSYNC_WAIT)) 385 (void) bawrite(bp); 386 else if ((error = bwrite(bp)) != 0) 387 return (error); 388 s = splbio(); 389 /* 390 * Since we may have slept during the I/O, we need 391 * to start from a known point. 392 */ 393 nbp = LIST_FIRST(&vp->v_dirtyblkhd); 394 } 395 if (skipmeta && !(ap->a_flags & FSYNC_DATAONLY)) { 396 skipmeta = 0; 397 goto loop; 398 } 399 if (ap->a_flags & FSYNC_WAIT) { 400 while (vp->v_numoutput) { 401 vp->v_flag |= VBWAIT; 402 (void) tsleep(&vp->v_numoutput, PRIBIO + 1, 403 "ffsfsync", 0); 404 } 405 splx(s); 406 407 if (ap->a_flags & FSYNC_DATAONLY) 408 return (0); 409 410 /* 411 * Ensure that any filesystem metadata associated 412 * with the vnode has been written. 413 */ 414 if ((error = softdep_sync_metadata(ap)) != 0) 415 return (error); 416 417 s = splbio(); 418 if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { 419 /* 420 * Block devices associated with filesystems may 421 * have new I/O requests posted for them even if 422 * the vnode is locked, so no amount of trying will 423 * get them clean. Thus we give block devices a 424 * good effort, then just give up. For all other file 425 * types, go around and try again until it is clean. 426 */ 427 if (passes > 0) { 428 passes--; 429 goto loop; 430 } 431 #ifdef DIAGNOSTIC 432 if (vp->v_type != VBLK) 433 vprint("ffs_fsync: dirty", vp); 434 #endif 435 } 436 } 437 splx(s); 438 439 if (inodedeps_only) 440 waitfor = 0; 441 else 442 waitfor = (ap->a_flags & FSYNC_WAIT) ? UPDATE_WAIT : 0; 443 return (VOP_UPDATE(vp, NULL, NULL, waitfor)); 444 } 445 446 /* 447 * Reclaim an inode so that it can be used for other purposes. 448 */ 449 int 450 ffs_reclaim(v) 451 void *v; 452 { 453 struct vop_reclaim_args /* { 454 struct vnode *a_vp; 455 struct proc *a_p; 456 } */ *ap = v; 457 struct vnode *vp = ap->a_vp; 458 int error; 459 460 if ((error = ufs_reclaim(vp, ap->a_p)) != 0) 461 return (error); 462 /* 463 * XXX MFS ends up here, too, to free an inode. Should we create 464 * XXX a separate pool for MFS inodes? 465 */ 466 pool_put(&ffs_inode_pool, vp->v_data); 467 vp->v_data = NULL; 468 return (0); 469 } 470 471 int 472 ffs_getpages(void *v) 473 { 474 struct vop_getpages_args /* { 475 struct vnode *a_vp; 476 voff_t a_offset; 477 struct vm_page **a_m; 478 int *a_count; 479 int a_centeridx; 480 vm_prot_t a_access_type; 481 int a_advice; 482 int a_flags; 483 } */ *ap = v; 484 struct vnode *vp = ap->a_vp; 485 struct inode *ip = VTOI(vp); 486 struct fs *fs = ip->i_fs; 487 488 /* 489 * don't allow a softdep write to create pages for only part of a block. 490 * the dependency tracking requires that all pages be in memory for 491 * a block involved in a dependency. 492 */ 493 494 if (ap->a_flags & PGO_OVERWRITE && 495 (blkoff(fs, ap->a_offset) != 0 || 496 blkoff(fs, *ap->a_count << PAGE_SHIFT) != 0) && 497 DOINGSOFTDEP(ap->a_vp)) { 498 if ((ap->a_flags & PGO_LOCKED) == 0) { 499 simple_unlock(&vp->v_interlock); 500 } 501 return EINVAL; 502 } 503 return genfs_getpages(v); 504 } 505 506 int 507 ffs_putpages(void *v) 508 { 509 struct vop_putpages_args /* { 510 struct vnode *a_vp; 511 voff_t a_offlo; 512 voff_t a_offhi; 513 int a_flags; 514 } */ *ap = v; 515 struct vnode *vp = ap->a_vp; 516 struct uvm_object *uobj = &vp->v_uobj; 517 struct inode *ip = VTOI(vp); 518 struct fs *fs = ip->i_fs; 519 struct vm_page *pg; 520 off_t off; 521 ufs_lbn_t lbn; 522 523 if (!DOINGSOFTDEP(vp) || (ap->a_flags & PGO_CLEANIT) == 0) { 524 return genfs_putpages(v); 525 } 526 527 /* 528 * for softdep files, force the pages in a block to be written together. 529 * if we're the pagedaemon and we would have to wait for other pages, 530 * just fail the request. the pagedaemon will pick a different page. 531 */ 532 533 ap->a_offlo &= ~fs->fs_qbmask; 534 lbn = lblkno(fs, ap->a_offhi); 535 ap->a_offhi = blkroundup(fs, ap->a_offhi); 536 if (curproc == uvm.pagedaemon_proc) { 537 for (off = ap->a_offlo; off < ap->a_offhi; off += PAGE_SIZE) { 538 pg = uvm_pagelookup(uobj, off); 539 540 /* 541 * we only have missing pages here because the 542 * calculation of offhi above doesn't account for 543 * fragments. so once we see one missing page, 544 * the rest should be missing as well, but we'll 545 * check for the rest just to be paranoid. 546 */ 547 548 if (pg == NULL) { 549 continue; 550 } 551 if (pg->flags & PG_BUSY) { 552 simple_unlock(&uobj->vmobjlock); 553 return EBUSY; 554 } 555 } 556 } 557 return genfs_putpages(v); 558 } 559 560 /* 561 * Return the last logical file offset that should be written for this file 562 * if we're doing a write that ends at "size". 563 */ 564 565 void 566 ffs_gop_size(struct vnode *vp, off_t size, off_t *eobp) 567 { 568 struct inode *ip = VTOI(vp); 569 struct fs *fs = ip->i_fs; 570 ufs_lbn_t olbn, nlbn; 571 572 olbn = lblkno(fs, ip->i_ffs_size); 573 nlbn = lblkno(fs, size); 574 if (nlbn < NDADDR && olbn <= nlbn) { 575 *eobp = fragroundup(fs, size); 576 } else { 577 *eobp = blkroundup(fs, size); 578 } 579 } 580