Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/nwfs/nwfs_io.c
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1 /*- 2 * Copyright (c) 1999 Boris Popov 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 * 28 */ 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/kernel.h> 32 #include <sys/bio.h> 33 #include <sys/buf.h> 34 #include <sys/mount.h> 35 #include <sys/namei.h> 36 #include <sys/vnode.h> 37 #include <sys/dirent.h> 38 #include <sys/sysctl.h> 39 40 #include <vm/vm.h> 41 #include <vm/vm_param.h> 42 #include <vm/vm_page.h> 43 #include <vm/vm_extern.h> 44 #include <vm/vm_object.h> 45 #include <vm/vm_pager.h> 46 #include <vm/vnode_pager.h> 47 48 #include <netncp/ncp.h> 49 #include <netncp/ncp_conn.h> 50 #include <netncp/ncp_subr.h> 51 #include <netncp/ncp_ncp.h> 52 53 #include <fs/nwfs/nwfs.h> 54 #include <fs/nwfs/nwfs_node.h> 55 #include <fs/nwfs/nwfs_subr.h> 56 57 static int nwfs_fastlookup = 1; 58 59 SYSCTL_DECL(_vfs_nwfs); 60 SYSCTL_INT(_vfs_nwfs, OID_AUTO, fastlookup, CTLFLAG_RW, &nwfs_fastlookup, 0, ""); 61 62 63 extern int nwfs_pbuf_freecnt; 64 65 #define DE_SIZE (sizeof(struct dirent)) 66 #define NWFS_RWCACHE 67 68 static int 69 nwfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) { 70 struct nwmount *nmp = VTONWFS(vp); 71 int error, count, i; 72 struct dirent dp; 73 struct nwnode *np = VTONW(vp); 74 struct nw_entry_info fattr; 75 struct vnode *newvp; 76 struct componentname cn; 77 ncpfid fid; 78 79 np = VTONW(vp); 80 NCPVNDEBUG("dirname='%s'\n",np->n_name); 81 if (uio->uio_resid < DE_SIZE || (uio->uio_offset < 0)) 82 return (EINVAL); 83 error = 0; 84 count = 0; 85 i = uio->uio_offset / DE_SIZE; /* offset in directory */ 86 if (i == 0) { 87 error = ncp_initsearch(vp, uio->uio_td, cred); 88 if (error) { 89 NCPVNDEBUG("cannot initialize search, error=%d",error); 90 return( error ); 91 } 92 } 93 94 for (; uio->uio_resid >= DE_SIZE; i++) { 95 bzero((char *) &dp, DE_SIZE); 96 dp.d_reclen = DE_SIZE; 97 switch (i) { 98 case 0: /* `.' */ 99 case 1: /* `..' */ 100 dp.d_fileno = (i == 0) ? np->n_fid.f_id : np->n_parent.f_id; 101 if (!dp.d_fileno) dp.d_fileno = NWFS_ROOT_INO; 102 dp.d_namlen = i + 1; 103 dp.d_name[0] = '.'; 104 dp.d_name[1] = '.'; 105 dp.d_name[i + 1] = '\0'; 106 dp.d_type = DT_DIR; 107 break; 108 default: 109 error = ncp_search_for_file_or_subdir(nmp, &np->n_seq, &fattr, uio->uio_td, cred); 110 if (error && error < 0x80) break; 111 dp.d_fileno = fattr.dirEntNum; 112 dp.d_type = (fattr.attributes & aDIR) ? DT_DIR : DT_REG; 113 dp.d_namlen = fattr.nameLen; 114 bcopy(fattr.entryName, dp.d_name, dp.d_namlen); 115 dp.d_name[dp.d_namlen] = '\0'; 116 #if 0 117 if (error && eofflag) { 118 /* *eofflag = 1;*/ 119 break; 120 } 121 #endif 122 break; 123 } 124 if (nwfs_fastlookup && !error && i > 1) { 125 fid.f_id = fattr.dirEntNum; 126 fid.f_parent = np->n_fid.f_id; 127 error = nwfs_nget(vp->v_mount, fid, &fattr, vp, &newvp); 128 if (!error) { 129 VTONW(newvp)->n_ctime = VTONW(newvp)->n_vattr.va_ctime.tv_sec; 130 cn.cn_nameptr = dp.d_name; 131 cn.cn_namelen = dp.d_namlen; 132 cache_enter(vp, newvp, &cn); 133 vput(newvp); 134 } else 135 error = 0; 136 } 137 if (error >= 0x80) { 138 error = 0; 139 break; 140 } 141 if ((error = uiomove(&dp, DE_SIZE, uio))) 142 break; 143 } 144 145 uio->uio_offset = i * DE_SIZE; 146 return (error); 147 } 148 149 int 150 nwfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred) { 151 struct nwmount *nmp = VFSTONWFS(vp->v_mount); 152 struct nwnode *np = VTONW(vp); 153 struct thread *td; 154 struct vattr vattr; 155 int error, biosize; 156 157 if (vp->v_type != VREG && vp->v_type != VDIR) { 158 printf("%s: vn types other than VREG or VDIR are unsupported !\n",__func__); 159 return EIO; 160 } 161 if (uiop->uio_resid == 0) return 0; 162 if (uiop->uio_offset < 0) return EINVAL; 163 /* if (uiop->uio_offset + uiop->uio_resid > nmp->nm_maxfilesize) 164 return (EFBIG);*/ 165 td = uiop->uio_td; 166 if (vp->v_type == VDIR) { 167 error = nwfs_readvdir(vp, uiop, cred); 168 return error; 169 } 170 biosize = NWFSTOCONN(nmp)->buffer_size; 171 if (np->n_flag & NMODIFIED) { 172 nwfs_attr_cacheremove(vp); 173 error = VOP_GETATTR(vp, &vattr, cred); 174 if (error) return (error); 175 np->n_mtime = vattr.va_mtime.tv_sec; 176 } else { 177 error = VOP_GETATTR(vp, &vattr, cred); 178 if (error) return (error); 179 if (np->n_mtime != vattr.va_mtime.tv_sec) { 180 error = nwfs_vinvalbuf(vp, td); 181 if (error) return (error); 182 np->n_mtime = vattr.va_mtime.tv_sec; 183 } 184 } 185 error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, uiop, cred); 186 return (error); 187 } 188 189 int 190 nwfs_writevnode(vp, uiop, cred, ioflag) 191 struct vnode *vp; 192 struct uio *uiop; 193 struct ucred *cred; 194 int ioflag; 195 { 196 struct nwmount *nmp = VTONWFS(vp); 197 struct nwnode *np = VTONW(vp); 198 struct thread *td; 199 /* struct vattr vattr;*/ 200 int error = 0; 201 202 if (vp->v_type != VREG) { 203 printf("%s: vn types other than VREG unsupported !\n",__func__); 204 return EIO; 205 } 206 NCPVNDEBUG("ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid); 207 if (uiop->uio_offset < 0) return EINVAL; 208 /* if (uiop->uio_offset + uiop->uio_resid > nmp->nm_maxfilesize) 209 return (EFBIG);*/ 210 td = uiop->uio_td; 211 if (ioflag & (IO_APPEND | IO_SYNC)) { 212 if (np->n_flag & NMODIFIED) { 213 nwfs_attr_cacheremove(vp); 214 error = nwfs_vinvalbuf(vp, td); 215 if (error) return (error); 216 } 217 if (ioflag & IO_APPEND) { 218 /* We can relay only on local information about file size, 219 * because until file is closed NetWare will not return 220 * the correct size. */ 221 #ifdef notyet 222 nwfs_attr_cacheremove(vp); 223 error = VOP_GETATTR(vp, &vattr, cred); 224 if (error) return (error); 225 #endif 226 uiop->uio_offset = np->n_size; 227 } 228 } 229 if (uiop->uio_resid == 0) return 0; 230 231 if (vn_rlimit_fsize(vp, uiop, td)) 232 return (EFBIG); 233 234 error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, uiop, cred); 235 NCPVNDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid); 236 if (!error) { 237 if (uiop->uio_offset > np->n_size) { 238 np->n_vattr.va_size = np->n_size = uiop->uio_offset; 239 vnode_pager_setsize(vp, np->n_size); 240 } 241 } 242 return (error); 243 } 244 245 /* 246 * Do an I/O operation to/from a cache block. 247 */ 248 int 249 nwfs_doio(vp, bp, cr, td) 250 struct vnode *vp; 251 struct buf *bp; 252 struct ucred *cr; 253 struct thread *td; 254 { 255 struct uio *uiop; 256 struct nwnode *np; 257 struct nwmount *nmp; 258 int error = 0; 259 struct uio uio; 260 struct iovec io; 261 262 np = VTONW(vp); 263 nmp = VFSTONWFS(vp->v_mount); 264 uiop = &uio; 265 uiop->uio_iov = &io; 266 uiop->uio_iovcnt = 1; 267 uiop->uio_segflg = UIO_SYSSPACE; 268 uiop->uio_td = td; 269 if (bp->b_iocmd == BIO_READ) { 270 io.iov_len = uiop->uio_resid = bp->b_bcount; 271 io.iov_base = bp->b_data; 272 uiop->uio_rw = UIO_READ; 273 switch (vp->v_type) { 274 case VREG: 275 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE; 276 error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, uiop, cr); 277 if (error) 278 break; 279 if (uiop->uio_resid) { 280 int left = uiop->uio_resid; 281 int nread = bp->b_bcount - left; 282 if (left > 0) 283 bzero((char *)bp->b_data + nread, left); 284 } 285 break; 286 /* case VDIR: 287 nfsstats.readdir_bios++; 288 uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ; 289 if (nmp->nm_flag & NFSMNT_RDIRPLUS) { 290 error = nfs_readdirplusrpc(vp, uiop, cr); 291 if (error == NFSERR_NOTSUPP) 292 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 293 } 294 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0) 295 error = nfs_readdirrpc(vp, uiop, cr); 296 if (error == 0 && uiop->uio_resid == bp->b_bcount) 297 bp->b_flags |= B_INVAL; 298 break; 299 */ 300 default: 301 printf("nwfs_doio: type %x unexpected\n",vp->v_type); 302 break; 303 }; 304 if (error) { 305 bp->b_ioflags |= BIO_ERROR; 306 bp->b_error = error; 307 } 308 } else { /* write */ 309 if (((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend) > np->n_size) 310 bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE); 311 312 if (bp->b_dirtyend > bp->b_dirtyoff) { 313 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff; 314 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff; 315 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff; 316 uiop->uio_rw = UIO_WRITE; 317 error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, uiop, cr); 318 319 /* 320 * For an interrupted write, the buffer is still valid 321 * and the write hasn't been pushed to the server yet, 322 * so we can't set BIO_ERROR and report the interruption 323 * by setting B_EINTR. For the B_ASYNC case, B_EINTR 324 * is not relevant, so the rpc attempt is essentially 325 * a noop. For the case of a V3 write rpc not being 326 * committed to stable storage, the block is still 327 * dirty and requires either a commit rpc or another 328 * write rpc with iomode == NFSV3WRITE_FILESYNC before 329 * the block is reused. This is indicated by setting 330 * the B_DELWRI and B_NEEDCOMMIT flags. 331 */ 332 if (error == EINTR 333 || (!error && (bp->b_flags & B_NEEDCOMMIT))) { 334 int s; 335 336 s = splbio(); 337 bp->b_flags &= ~(B_INVAL|B_NOCACHE); 338 if ((bp->b_flags & B_ASYNC) == 0) 339 bp->b_flags |= B_EINTR; 340 if ((bp->b_flags & B_PAGING) == 0) { 341 bdirty(bp); 342 bp->b_flags &= ~B_DONE; 343 } 344 if ((bp->b_flags & B_ASYNC) == 0) 345 bp->b_flags |= B_EINTR; 346 splx(s); 347 } else { 348 if (error) { 349 bp->b_ioflags |= BIO_ERROR; 350 bp->b_error /*= np->n_error */= error; 351 /* np->n_flag |= NWRITEERR;*/ 352 } 353 bp->b_dirtyoff = bp->b_dirtyend = 0; 354 } 355 } else { 356 bp->b_resid = 0; 357 bufdone(bp); 358 return (0); 359 } 360 } 361 bp->b_resid = uiop->uio_resid; 362 bufdone(bp); 363 return (error); 364 } 365 366 /* 367 * Vnode op for VM getpages. 368 * Wish wish .... get rid from multiple IO routines 369 */ 370 int 371 nwfs_getpages(ap) 372 struct vop_getpages_args /* { 373 struct vnode *a_vp; 374 vm_page_t *a_m; 375 int a_count; 376 int a_reqpage; 377 vm_ooffset_t a_offset; 378 } */ *ap; 379 { 380 #ifndef NWFS_RWCACHE 381 return vop_stdgetpages(ap);(ap->a_vp, ap->a_m, ap->a_count, 382 #else 383 int i, error, nextoff, size, toff, npages, count; 384 struct uio uio; 385 struct iovec iov; 386 vm_offset_t kva; 387 struct buf *bp; 388 struct vnode *vp; 389 struct thread *td; 390 struct ucred *cred; 391 struct nwmount *nmp; 392 struct nwnode *np; 393 vm_object_t object; 394 vm_page_t *pages; 395 396 vp = ap->a_vp; 397 td = curthread; /* XXX */ 398 cred = td->td_ucred; /* XXX */ 399 np = VTONW(vp); 400 nmp = VFSTONWFS(vp->v_mount); 401 pages = ap->a_m; 402 count = ap->a_count; 403 404 if ((object = vp->v_object) == NULL) { 405 printf("nwfs_getpages: called with non-merged cache vnode??\n"); 406 return VM_PAGER_ERROR; 407 } 408 409 bp = getpbuf(&nwfs_pbuf_freecnt); 410 npages = btoc(count); 411 kva = (vm_offset_t) bp->b_data; 412 pmap_qenter(kva, pages, npages); 413 414 iov.iov_base = (caddr_t) kva; 415 iov.iov_len = count; 416 uio.uio_iov = &iov; 417 uio.uio_iovcnt = 1; 418 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 419 uio.uio_resid = count; 420 uio.uio_segflg = UIO_SYSSPACE; 421 uio.uio_rw = UIO_READ; 422 uio.uio_td = td; 423 424 error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, &uio,cred); 425 pmap_qremove(kva, npages); 426 427 relpbuf(bp, &nwfs_pbuf_freecnt); 428 429 VM_OBJECT_LOCK(object); 430 if (error && (uio.uio_resid == count)) { 431 printf("nwfs_getpages: error %d\n",error); 432 for (i = 0; i < npages; i++) { 433 if (ap->a_reqpage != i) { 434 vm_page_lock(pages[i]); 435 vm_page_free(pages[i]); 436 vm_page_unlock(pages[i]); 437 } 438 } 439 VM_OBJECT_UNLOCK(object); 440 return VM_PAGER_ERROR; 441 } 442 443 size = count - uio.uio_resid; 444 445 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) { 446 vm_page_t m; 447 nextoff = toff + PAGE_SIZE; 448 m = pages[i]; 449 450 if (nextoff <= size) { 451 m->valid = VM_PAGE_BITS_ALL; 452 KASSERT(m->dirty == 0, 453 ("nwfs_getpages: page %p is dirty", m)); 454 } else { 455 int nvalid = ((size + DEV_BSIZE - 1) - toff) & ~(DEV_BSIZE - 1); 456 vm_page_set_valid(m, 0, nvalid); 457 KASSERT((m->dirty & vm_page_bits(0, nvalid)) == 0, 458 ("nwfs_getpages: page %p is dirty", m)); 459 } 460 461 if (i != ap->a_reqpage) 462 vm_page_readahead_finish(m); 463 } 464 VM_OBJECT_UNLOCK(object); 465 return 0; 466 #endif /* NWFS_RWCACHE */ 467 } 468 469 /* 470 * Vnode op for VM putpages. 471 * possible bug: all IO done in sync mode 472 * Note that vop_close always invalidate pages before close, so it's 473 * not necessary to open vnode. 474 */ 475 int 476 nwfs_putpages(ap) 477 struct vop_putpages_args /* { 478 struct vnode *a_vp; 479 vm_page_t *a_m; 480 int a_count; 481 int a_sync; 482 int *a_rtvals; 483 vm_ooffset_t a_offset; 484 } */ *ap; 485 { 486 int error; 487 struct vnode *vp = ap->a_vp; 488 struct thread *td; 489 struct ucred *cred; 490 491 #ifndef NWFS_RWCACHE 492 td = curthread; /* XXX */ 493 cred = td->td_ucred; /* XXX */ 494 VOP_OPEN(vp, FWRITE, cred, td, NULL); 495 error = vop_stdputpages(ap); 496 VOP_CLOSE(vp, FWRITE, cred, td); 497 return error; 498 #else 499 struct uio uio; 500 struct iovec iov; 501 vm_offset_t kva; 502 struct buf *bp; 503 int i, npages, count; 504 int *rtvals; 505 struct nwmount *nmp; 506 struct nwnode *np; 507 vm_page_t *pages; 508 509 td = curthread; /* XXX */ 510 cred = td->td_ucred; /* XXX */ 511 /* VOP_OPEN(vp, FWRITE, cred, td, NULL);*/ 512 np = VTONW(vp); 513 nmp = VFSTONWFS(vp->v_mount); 514 pages = ap->a_m; 515 count = ap->a_count; 516 rtvals = ap->a_rtvals; 517 npages = btoc(count); 518 519 for (i = 0; i < npages; i++) { 520 rtvals[i] = VM_PAGER_ERROR; 521 } 522 523 bp = getpbuf(&nwfs_pbuf_freecnt); 524 kva = (vm_offset_t) bp->b_data; 525 pmap_qenter(kva, pages, npages); 526 527 iov.iov_base = (caddr_t) kva; 528 iov.iov_len = count; 529 uio.uio_iov = &iov; 530 uio.uio_iovcnt = 1; 531 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 532 uio.uio_resid = count; 533 uio.uio_segflg = UIO_SYSSPACE; 534 uio.uio_rw = UIO_WRITE; 535 uio.uio_td = td; 536 NCPVNDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid); 537 538 error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, &uio, cred); 539 /* VOP_CLOSE(vp, FWRITE, cred, td);*/ 540 NCPVNDEBUG("paged write done: %d\n", error); 541 542 pmap_qremove(kva, npages); 543 relpbuf(bp, &nwfs_pbuf_freecnt); 544 545 if (!error) 546 vnode_pager_undirty_pages(pages, rtvals, count - uio.uio_resid); 547 return rtvals[0]; 548 #endif /* NWFS_RWCACHE */ 549 } 550 /* 551 * Flush and invalidate all dirty buffers. If another process is already 552 * doing the flush, just wait for completion. 553 */ 554 int 555 nwfs_vinvalbuf(vp, td) 556 struct vnode *vp; 557 struct thread *td; 558 { 559 struct nwnode *np = VTONW(vp); 560 /* struct nwmount *nmp = VTONWFS(vp);*/ 561 int error = 0; 562 563 if (vp->v_iflag & VI_DOOMED) 564 return (0); 565 566 while (np->n_flag & NFLUSHINPROG) { 567 np->n_flag |= NFLUSHWANT; 568 error = tsleep(&np->n_flag, PRIBIO + 2, "nwfsvinv", 2 * hz); 569 error = ncp_chkintr(NWFSTOCONN(VTONWFS(vp)), td); 570 if (error == EINTR) 571 return EINTR; 572 } 573 np->n_flag |= NFLUSHINPROG; 574 575 if (vp->v_bufobj.bo_object != NULL) { 576 VM_OBJECT_LOCK(vp->v_bufobj.bo_object); 577 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC); 578 VM_OBJECT_UNLOCK(vp->v_bufobj.bo_object); 579 } 580 581 error = vinvalbuf(vp, V_SAVE, PCATCH, 0); 582 while (error) { 583 if (error == ERESTART || error == EINTR) { 584 np->n_flag &= ~NFLUSHINPROG; 585 if (np->n_flag & NFLUSHWANT) { 586 np->n_flag &= ~NFLUSHWANT; 587 wakeup(&np->n_flag); 588 } 589 return EINTR; 590 } 591 error = vinvalbuf(vp, V_SAVE, PCATCH, 0); 592 } 593 np->n_flag &= ~(NMODIFIED | NFLUSHINPROG); 594 if (np->n_flag & NFLUSHWANT) { 595 np->n_flag &= ~NFLUSHWANT; 596 wakeup(&np->n_flag); 597 } 598 return (error); 599 }
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