Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/ufs/ffs/ffs_vnops.c
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1 /* $NetBSD: ffs_vnops.c,v 1.69.2.2 2005/10/21 11:25:56 tron 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)ffs_vnops.c 8.15 (Berkeley) 5/14/95 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: ffs_vnops.c,v 1.69.2.2 2005/10/21 11:25:56 tron Exp $"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/resourcevar.h> 40 #include <sys/kernel.h> 41 #include <sys/file.h> 42 #include <sys/stat.h> 43 #include <sys/buf.h> 44 #include <sys/event.h> 45 #include <sys/proc.h> 46 #include <sys/mount.h> 47 #include <sys/vnode.h> 48 #include <sys/pool.h> 49 #include <sys/signalvar.h> 50 51 #include <miscfs/fifofs/fifo.h> 52 #include <miscfs/genfs/genfs.h> 53 #include <miscfs/specfs/specdev.h> 54 55 #include <ufs/ufs/inode.h> 56 #include <ufs/ufs/dir.h> 57 #include <ufs/ufs/ufs_extern.h> 58 #include <ufs/ufs/ufsmount.h> 59 60 #include <ufs/ffs/fs.h> 61 #include <ufs/ffs/ffs_extern.h> 62 63 #include <uvm/uvm.h> 64 65 static int ffs_full_fsync __P((void *)); 66 67 /* Global vfs data structures for ufs. */ 68 int (**ffs_vnodeop_p) __P((void *)); 69 const struct vnodeopv_entry_desc ffs_vnodeop_entries[] = { 70 { &vop_default_desc, vn_default_error }, 71 { &vop_lookup_desc, ufs_lookup }, /* lookup */ 72 { &vop_create_desc, ufs_create }, /* create */ 73 { &vop_whiteout_desc, ufs_whiteout }, /* whiteout */ 74 { &vop_mknod_desc, ufs_mknod }, /* mknod */ 75 { &vop_open_desc, ufs_open }, /* open */ 76 { &vop_close_desc, ufs_close }, /* close */ 77 { &vop_access_desc, ufs_access }, /* access */ 78 { &vop_getattr_desc, ufs_getattr }, /* getattr */ 79 { &vop_setattr_desc, ufs_setattr }, /* setattr */ 80 { &vop_read_desc, ffs_read }, /* read */ 81 { &vop_write_desc, ffs_write }, /* write */ 82 { &vop_lease_desc, ufs_lease_check }, /* lease */ 83 { &vop_ioctl_desc, ufs_ioctl }, /* ioctl */ 84 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 85 { &vop_poll_desc, ufs_poll }, /* poll */ 86 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 87 { &vop_revoke_desc, ufs_revoke }, /* revoke */ 88 { &vop_mmap_desc, ufs_mmap }, /* mmap */ 89 { &vop_fsync_desc, ffs_fsync }, /* fsync */ 90 { &vop_seek_desc, ufs_seek }, /* seek */ 91 { &vop_remove_desc, ufs_remove }, /* remove */ 92 { &vop_link_desc, ufs_link }, /* link */ 93 { &vop_rename_desc, ufs_rename }, /* rename */ 94 { &vop_mkdir_desc, ufs_mkdir }, /* mkdir */ 95 { &vop_rmdir_desc, ufs_rmdir }, /* rmdir */ 96 { &vop_symlink_desc, ufs_symlink }, /* symlink */ 97 { &vop_readdir_desc, ufs_readdir }, /* readdir */ 98 { &vop_readlink_desc, ufs_readlink }, /* readlink */ 99 { &vop_abortop_desc, ufs_abortop }, /* abortop */ 100 { &vop_inactive_desc, ufs_inactive }, /* inactive */ 101 { &vop_reclaim_desc, ffs_reclaim }, /* reclaim */ 102 { &vop_lock_desc, ufs_lock }, /* lock */ 103 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 104 { &vop_bmap_desc, ufs_bmap }, /* bmap */ 105 { &vop_strategy_desc, ufs_strategy }, /* strategy */ 106 { &vop_print_desc, ufs_print }, /* print */ 107 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 108 { &vop_pathconf_desc, ufs_pathconf }, /* pathconf */ 109 { &vop_advlock_desc, ufs_advlock }, /* advlock */ 110 { &vop_blkatoff_desc, ffs_blkatoff }, /* blkatoff */ 111 { &vop_valloc_desc, ffs_valloc }, /* valloc */ 112 { &vop_balloc_desc, ffs_balloc }, /* balloc */ 113 { &vop_reallocblks_desc, ffs_reallocblks }, /* reallocblks */ 114 { &vop_vfree_desc, ffs_vfree }, /* vfree */ 115 { &vop_truncate_desc, ffs_truncate }, /* truncate */ 116 { &vop_update_desc, ffs_update }, /* update */ 117 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 118 { &vop_getpages_desc, ffs_getpages }, /* getpages */ 119 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 120 { NULL, NULL } 121 }; 122 const struct vnodeopv_desc ffs_vnodeop_opv_desc = 123 { &ffs_vnodeop_p, ffs_vnodeop_entries }; 124 125 int (**ffs_specop_p) __P((void *)); 126 const struct vnodeopv_entry_desc ffs_specop_entries[] = { 127 { &vop_default_desc, vn_default_error }, 128 { &vop_lookup_desc, spec_lookup }, /* lookup */ 129 { &vop_create_desc, spec_create }, /* create */ 130 { &vop_mknod_desc, spec_mknod }, /* mknod */ 131 { &vop_open_desc, spec_open }, /* open */ 132 { &vop_close_desc, ufsspec_close }, /* close */ 133 { &vop_access_desc, ufs_access }, /* access */ 134 { &vop_getattr_desc, ufs_getattr }, /* getattr */ 135 { &vop_setattr_desc, ufs_setattr }, /* setattr */ 136 { &vop_read_desc, ufsspec_read }, /* read */ 137 { &vop_write_desc, ufsspec_write }, /* write */ 138 { &vop_lease_desc, spec_lease_check }, /* lease */ 139 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 140 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 141 { &vop_poll_desc, spec_poll }, /* poll */ 142 { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ 143 { &vop_revoke_desc, spec_revoke }, /* revoke */ 144 { &vop_mmap_desc, spec_mmap }, /* mmap */ 145 { &vop_fsync_desc, ffs_fsync }, /* fsync */ 146 { &vop_seek_desc, spec_seek }, /* seek */ 147 { &vop_remove_desc, spec_remove }, /* remove */ 148 { &vop_link_desc, spec_link }, /* link */ 149 { &vop_rename_desc, spec_rename }, /* rename */ 150 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 151 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 152 { &vop_symlink_desc, spec_symlink }, /* symlink */ 153 { &vop_readdir_desc, spec_readdir }, /* readdir */ 154 { &vop_readlink_desc, spec_readlink }, /* readlink */ 155 { &vop_abortop_desc, spec_abortop }, /* abortop */ 156 { &vop_inactive_desc, ufs_inactive }, /* inactive */ 157 { &vop_reclaim_desc, ffs_reclaim }, /* reclaim */ 158 { &vop_lock_desc, ufs_lock }, /* lock */ 159 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 160 { &vop_bmap_desc, spec_bmap }, /* bmap */ 161 { &vop_strategy_desc, spec_strategy }, /* strategy */ 162 { &vop_print_desc, ufs_print }, /* print */ 163 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 164 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 165 { &vop_advlock_desc, spec_advlock }, /* advlock */ 166 { &vop_blkatoff_desc, spec_blkatoff }, /* blkatoff */ 167 { &vop_valloc_desc, spec_valloc }, /* valloc */ 168 { &vop_reallocblks_desc, spec_reallocblks }, /* reallocblks */ 169 { &vop_vfree_desc, ffs_vfree }, /* vfree */ 170 { &vop_truncate_desc, spec_truncate }, /* truncate */ 171 { &vop_update_desc, ffs_update }, /* update */ 172 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 173 { &vop_getpages_desc, spec_getpages }, /* getpages */ 174 { &vop_putpages_desc, spec_putpages }, /* putpages */ 175 { NULL, NULL } 176 }; 177 const struct vnodeopv_desc ffs_specop_opv_desc = 178 { &ffs_specop_p, ffs_specop_entries }; 179 180 int (**ffs_fifoop_p) __P((void *)); 181 const struct vnodeopv_entry_desc ffs_fifoop_entries[] = { 182 { &vop_default_desc, vn_default_error }, 183 { &vop_lookup_desc, fifo_lookup }, /* lookup */ 184 { &vop_create_desc, fifo_create }, /* create */ 185 { &vop_mknod_desc, fifo_mknod }, /* mknod */ 186 { &vop_open_desc, fifo_open }, /* open */ 187 { &vop_close_desc, ufsfifo_close }, /* close */ 188 { &vop_access_desc, ufs_access }, /* access */ 189 { &vop_getattr_desc, ufs_getattr }, /* getattr */ 190 { &vop_setattr_desc, ufs_setattr }, /* setattr */ 191 { &vop_read_desc, ufsfifo_read }, /* read */ 192 { &vop_write_desc, ufsfifo_write }, /* write */ 193 { &vop_lease_desc, fifo_lease_check }, /* lease */ 194 { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ 195 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 196 { &vop_poll_desc, fifo_poll }, /* poll */ 197 { &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */ 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 #include <ufs/ufs/ufs_readwrite.c> 235 236 int 237 ffs_fsync(v) 238 void *v; 239 { 240 struct vop_fsync_args /* { 241 struct vnode *a_vp; 242 struct ucred *a_cred; 243 int a_flags; 244 off_t a_offlo; 245 off_t a_offhi; 246 struct proc *a_p; 247 } */ *ap = v; 248 struct buf *bp; 249 int s, num, error, i; 250 struct indir ia[NIADDR + 1]; 251 int bsize; 252 daddr_t blk_high; 253 struct vnode *vp; 254 255 /* 256 * XXX no easy way to sync a range in a file with softdep. 257 */ 258 if ((ap->a_offlo == 0 && ap->a_offhi == 0) || DOINGSOFTDEP(ap->a_vp) || 259 (ap->a_vp->v_type != VREG)) 260 return ffs_full_fsync(v); 261 262 vp = ap->a_vp; 263 264 bsize = ap->a_vp->v_mount->mnt_stat.f_iosize; 265 blk_high = ap->a_offhi / bsize; 266 if (ap->a_offhi % bsize != 0) 267 blk_high++; 268 269 /* 270 * First, flush all pages in range. 271 */ 272 273 simple_lock(&vp->v_interlock); 274 error = VOP_PUTPAGES(vp, trunc_page(ap->a_offlo), 275 round_page(ap->a_offhi), PGO_CLEANIT | 276 ((ap->a_flags & FSYNC_WAIT) ? PGO_SYNCIO : 0)); 277 if (error) { 278 return error; 279 } 280 281 /* 282 * Then, flush indirect blocks. 283 */ 284 285 s = splbio(); 286 if (blk_high >= NDADDR) { 287 error = ufs_getlbns(vp, blk_high, ia, &num); 288 if (error) { 289 splx(s); 290 return error; 291 } 292 for (i = 0; i < num; i++) { 293 bp = incore(vp, ia[i].in_lbn); 294 if (bp != NULL) { 295 simple_lock(&bp->b_interlock); 296 if (!(bp->b_flags & B_BUSY) && (bp->b_flags & B_DELWRI)) { 297 bp->b_flags |= B_BUSY | B_VFLUSH; 298 simple_unlock(&bp->b_interlock); 299 splx(s); 300 bawrite(bp); 301 s = splbio(); 302 } else { 303 simple_unlock(&bp->b_interlock); 304 } 305 } 306 } 307 } 308 309 if (ap->a_flags & FSYNC_WAIT) { 310 simple_lock(&global_v_numoutput_slock); 311 while (vp->v_numoutput > 0) { 312 vp->v_flag |= VBWAIT; 313 ltsleep(&vp->v_numoutput, PRIBIO + 1, "fsync_range", 0, 314 &global_v_numoutput_slock); 315 } 316 simple_unlock(&global_v_numoutput_slock); 317 } 318 splx(s); 319 320 error = VOP_UPDATE(vp, NULL, NULL, 321 ((ap->a_flags & (FSYNC_WAIT | FSYNC_DATAONLY)) == FSYNC_WAIT) 322 ? UPDATE_WAIT : 0); 323 324 if (error == 0 && ap->a_flags & FSYNC_CACHE) { 325 int l = 0; 326 VOP_IOCTL(VTOI(vp)->i_devvp, DIOCCACHESYNC, &l, FWRITE, 327 ap->a_p->p_ucred, ap->a_p); 328 } 329 330 return error; 331 } 332 333 /* 334 * Synch an open file. 335 */ 336 /* ARGSUSED */ 337 static int 338 ffs_full_fsync(v) 339 void *v; 340 { 341 struct vop_fsync_args /* { 342 struct vnode *a_vp; 343 struct ucred *a_cred; 344 int a_flags; 345 off_t a_offlo; 346 off_t a_offhi; 347 struct proc *a_p; 348 } */ *ap = v; 349 struct vnode *vp = ap->a_vp; 350 struct buf *bp, *nbp; 351 int s, error, passes, skipmeta, inodedeps_only, waitfor; 352 353 if (vp->v_type == VBLK && 354 vp->v_specmountpoint != NULL && 355 (vp->v_specmountpoint->mnt_flag & MNT_SOFTDEP)) 356 softdep_fsync_mountdev(vp); 357 358 inodedeps_only = DOINGSOFTDEP(vp) && (ap->a_flags & FSYNC_RECLAIM) 359 && vp->v_uobj.uo_npages == 0 && LIST_EMPTY(&vp->v_dirtyblkhd); 360 361 /* 362 * Flush all dirty data associated with a vnode. 363 */ 364 365 if (vp->v_type == VREG || vp->v_type == VBLK) { 366 simple_lock(&vp->v_interlock); 367 error = VOP_PUTPAGES(vp, 0, 0, PGO_ALLPAGES | PGO_CLEANIT | 368 ((ap->a_flags & FSYNC_WAIT) ? PGO_SYNCIO : 0)); 369 if (error) { 370 return error; 371 } 372 } 373 374 passes = NIADDR + 1; 375 skipmeta = 0; 376 if (ap->a_flags & FSYNC_WAIT) 377 skipmeta = 1; 378 s = splbio(); 379 380 loop: 381 LIST_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs) 382 bp->b_flags &= ~B_SCANNED; 383 for (bp = LIST_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 384 nbp = LIST_NEXT(bp, b_vnbufs); 385 simple_lock(&bp->b_interlock); 386 if (bp->b_flags & (B_BUSY | B_SCANNED)) { 387 simple_unlock(&bp->b_interlock); 388 continue; 389 } 390 if ((bp->b_flags & B_DELWRI) == 0) 391 panic("ffs_fsync: not dirty"); 392 if (skipmeta && bp->b_lblkno < 0) { 393 simple_unlock(&bp->b_interlock); 394 continue; 395 } 396 simple_unlock(&bp->b_interlock); 397 bp->b_flags |= B_BUSY | B_VFLUSH | B_SCANNED; 398 splx(s); 399 /* 400 * On our final pass through, do all I/O synchronously 401 * so that we can find out if our flush is failing 402 * because of write errors. 403 */ 404 if (passes > 0 || !(ap->a_flags & FSYNC_WAIT)) 405 (void) bawrite(bp); 406 else if ((error = bwrite(bp)) != 0) 407 return (error); 408 s = splbio(); 409 /* 410 * Since we may have slept during the I/O, we need 411 * to start from a known point. 412 */ 413 nbp = LIST_FIRST(&vp->v_dirtyblkhd); 414 } 415 if (skipmeta) { 416 skipmeta = 0; 417 goto loop; 418 } 419 if (ap->a_flags & FSYNC_WAIT) { 420 simple_lock(&global_v_numoutput_slock); 421 while (vp->v_numoutput) { 422 vp->v_flag |= VBWAIT; 423 (void) ltsleep(&vp->v_numoutput, PRIBIO + 1, 424 "ffsfsync", 0, &global_v_numoutput_slock); 425 } 426 simple_unlock(&global_v_numoutput_slock); 427 splx(s); 428 429 /* 430 * Ensure that any filesystem metadata associated 431 * with the vnode has been written. 432 */ 433 if ((error = softdep_sync_metadata(ap)) != 0) 434 return (error); 435 436 s = splbio(); 437 if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { 438 /* 439 * Block devices associated with filesystems may 440 * have new I/O requests posted for them even if 441 * the vnode is locked, so no amount of trying will 442 * get them clean. Thus we give block devices a 443 * good effort, then just give up. For all other file 444 * types, go around and try again until it is clean. 445 */ 446 if (passes > 0) { 447 passes--; 448 goto loop; 449 } 450 #ifdef DIAGNOSTIC 451 if (vp->v_type != VBLK) 452 vprint("ffs_fsync: dirty", vp); 453 #endif 454 } 455 } 456 splx(s); 457 458 if (inodedeps_only) 459 waitfor = 0; 460 else 461 waitfor = (ap->a_flags & FSYNC_WAIT) ? UPDATE_WAIT : 0; 462 error = VOP_UPDATE(vp, NULL, NULL, waitfor); 463 464 if (error == 0 && ap->a_flags & FSYNC_CACHE) { 465 int i = 0; 466 VOP_IOCTL(VTOI(vp)->i_devvp, DIOCCACHESYNC, &i, FWRITE, 467 ap->a_p->p_ucred, ap->a_p); 468 } 469 470 return error; 471 } 472 473 /* 474 * Reclaim an inode so that it can be used for other purposes. 475 */ 476 int 477 ffs_reclaim(v) 478 void *v; 479 { 480 struct vop_reclaim_args /* { 481 struct vnode *a_vp; 482 struct proc *a_p; 483 } */ *ap = v; 484 struct vnode *vp = ap->a_vp; 485 struct inode *ip = VTOI(vp); 486 struct ufsmount *ump = ip->i_ump; 487 int error; 488 489 if ((error = ufs_reclaim(vp, ap->a_p)) != 0) 490 return (error); 491 if (ip->i_din.ffs1_din != NULL) { 492 if (ump->um_fstype == UFS1) 493 pool_put(&ffs_dinode1_pool, ip->i_din.ffs1_din); 494 else 495 pool_put(&ffs_dinode2_pool, ip->i_din.ffs2_din); 496 } 497 /* 498 * XXX MFS ends up here, too, to free an inode. Should we create 499 * XXX a separate pool for MFS inodes? 500 */ 501 pool_put(&ffs_inode_pool, vp->v_data); 502 vp->v_data = NULL; 503 return (0); 504 } 505 506 int 507 ffs_getpages(void *v) 508 { 509 struct vop_getpages_args /* { 510 struct vnode *a_vp; 511 voff_t a_offset; 512 struct vm_page **a_m; 513 int *a_count; 514 int a_centeridx; 515 vm_prot_t a_access_type; 516 int a_advice; 517 int a_flags; 518 } */ *ap = v; 519 struct vnode *vp = ap->a_vp; 520 struct inode *ip = VTOI(vp); 521 struct fs *fs = ip->i_fs; 522 523 /* 524 * don't allow a softdep write to create pages for only part of a block. 525 * the dependency tracking requires that all pages be in memory for 526 * a block involved in a dependency. 527 */ 528 529 if (ap->a_flags & PGO_OVERWRITE && 530 (blkoff(fs, ap->a_offset) != 0 || 531 blkoff(fs, *ap->a_count << PAGE_SHIFT) != 0) && 532 DOINGSOFTDEP(ap->a_vp)) { 533 if ((ap->a_flags & PGO_LOCKED) == 0) { 534 simple_unlock(&vp->v_interlock); 535 } 536 return EINVAL; 537 } 538 return genfs_getpages(v); 539 } 540 541 /* 542 * Return the last logical file offset that should be written for this file 543 * if we're doing a write that ends at "size". 544 */ 545 546 void 547 ffs_gop_size(struct vnode *vp, off_t size, off_t *eobp, int flags) 548 { 549 struct inode *ip = VTOI(vp); 550 struct fs *fs = ip->i_fs; 551 daddr_t olbn, nlbn; 552 553 KASSERT(flags & (GOP_SIZE_READ | GOP_SIZE_WRITE)); 554 KASSERT((flags & (GOP_SIZE_READ | GOP_SIZE_WRITE)) 555 != (GOP_SIZE_READ | GOP_SIZE_WRITE)); 556 557 olbn = lblkno(fs, ip->i_size); 558 nlbn = lblkno(fs, size); 559 if (nlbn < NDADDR && olbn <= nlbn) { 560 *eobp = fragroundup(fs, size); 561 } else { 562 *eobp = blkroundup(fs, size); 563 } 564 }
Cache object: 72fcbca94d0b582d0533d9fd35743c97
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