dtfs_vnops.c revision 1.6
1 /* $NetBSD: dtfs_vnops.c,v 1.6 2010/07/14 21:24:40 pooka Exp $ */ 2 3 /* 4 * Copyright (c) 2006 Antti Kantee. All Rights Reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/types.h> 29 #include <sys/poll.h> 30 31 #include <assert.h> 32 #include <errno.h> 33 #include <puffs.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <unistd.h> 38 #include <util.h> 39 40 #include "dtfs.h" 41 42 int 43 dtfs_node_lookup(struct puffs_usermount *pu, void *opc, 44 struct puffs_newinfo *pni, const struct puffs_cn *pcn) 45 { 46 struct puffs_node *pn_dir = opc; 47 struct dtfs_file *df = DTFS_CTOF(opc); 48 struct dtfs_dirent *dfd; 49 extern int straightflush; 50 int rv; 51 52 /* parent dir? */ 53 if (PCNISDOTDOT(pcn)) { 54 assert(df->df_dotdot->pn_va.va_type == VDIR); 55 puffs_newinfo_setcookie(pni, df->df_dotdot); 56 puffs_newinfo_setvtype(pni, df->df_dotdot->pn_va.va_type); 57 58 return 0; 59 } 60 61 dfd = dtfs_dirgetbyname(df, pcn->pcn_name, pcn->pcn_namelen); 62 if (dfd) { 63 puffs_newinfo_setcookie(pni, dfd->dfd_node); 64 puffs_newinfo_setvtype(pni, dfd->dfd_node->pn_va.va_type); 65 puffs_newinfo_setsize(pni, dfd->dfd_node->pn_va.va_size); 66 puffs_newinfo_setrdev(pni, dfd->dfd_node->pn_va.va_rdev); 67 68 if (straightflush) 69 puffs_flush_pagecache_node(pu, dfd->dfd_node); 70 71 return 0; 72 } 73 74 if ((pcn->pcn_flags & NAMEI_ISLASTCN) 75 && (pcn->pcn_nameiop == NAMEI_CREATE || 76 pcn->pcn_nameiop == NAMEI_RENAME)) { 77 rv = puffs_access(VDIR, pn_dir->pn_va.va_mode, 78 pn_dir->pn_va.va_uid, pn_dir->pn_va.va_gid, 79 PUFFS_VWRITE, pcn->pcn_cred); 80 if (rv) 81 return rv; 82 } 83 84 return ENOENT; 85 } 86 87 int 88 dtfs_node_access(struct puffs_usermount *pu, void *opc, int acc_mode, 89 const struct puffs_cred *pcr) 90 { 91 struct puffs_node *pn = opc; 92 93 return puffs_access(pn->pn_va.va_type, pn->pn_va.va_mode, 94 pn->pn_va.va_uid, pn->pn_va.va_gid, acc_mode, pcr); 95 } 96 97 int 98 dtfs_node_setattr(struct puffs_usermount *pu, void *opc, 99 const struct vattr *va, const struct puffs_cred *pcr) 100 { 101 struct puffs_node *pn = opc; 102 int rv; 103 104 /* check permissions */ 105 if (va->va_flags != PUFFS_VNOVAL) 106 return EOPNOTSUPP; 107 108 if (va->va_uid != PUFFS_VNOVAL || va->va_gid != PUFFS_VNOVAL) { 109 rv = puffs_access_chown(pn->pn_va.va_uid, pn->pn_va.va_gid, 110 va->va_uid, va->va_gid, pcr); 111 if (rv) 112 return rv; 113 } 114 115 if (va->va_mode != PUFFS_VNOVAL) { 116 rv = puffs_access_chmod(pn->pn_va.va_uid, pn->pn_va.va_gid, 117 pn->pn_va.va_type, va->va_mode, pcr); 118 if (rv) 119 return rv; 120 } 121 122 if ((va->va_atime.tv_sec != PUFFS_VNOVAL 123 && va->va_atime.tv_nsec != PUFFS_VNOVAL) 124 || (va->va_mtime.tv_sec != PUFFS_VNOVAL 125 && va->va_mtime.tv_nsec != PUFFS_VNOVAL)) { 126 rv = puffs_access_times(pn->pn_va.va_uid, pn->pn_va.va_gid, 127 pn->pn_va.va_mode, va->va_vaflags & VA_UTIMES_NULL, pcr); 128 if (rv) 129 return rv; 130 } 131 132 if (va->va_size != PUFFS_VNOVAL) { 133 switch (pn->pn_va.va_type) { 134 case VREG: 135 dtfs_setsize(pn, va->va_size); 136 pn->pn_va.va_bytes = va->va_size; 137 break; 138 case VBLK: 139 case VCHR: 140 case VFIFO: 141 break; 142 case VDIR: 143 return EISDIR; 144 default: 145 return EOPNOTSUPP; 146 } 147 } 148 149 puffs_setvattr(&pn->pn_va, va); 150 151 return 0; 152 } 153 154 /* create a new node in the parent directory specified by opc */ 155 int 156 dtfs_node_create(struct puffs_usermount *pu, void *opc, 157 struct puffs_newinfo *pni, const struct puffs_cn *pcn, 158 const struct vattr *va) 159 { 160 struct puffs_node *pn_parent = opc; 161 struct puffs_node *pn_new; 162 163 if (!(va->va_type == VREG || va->va_type == VSOCK)) 164 return ENODEV; 165 166 pn_new = dtfs_genfile(pn_parent, pcn, va->va_type); 167 puffs_setvattr(&pn_new->pn_va, va); 168 169 puffs_newinfo_setcookie(pni, pn_new); 170 171 return 0; 172 } 173 174 int 175 dtfs_node_remove(struct puffs_usermount *pu, void *opc, void *targ, 176 const struct puffs_cn *pcn) 177 { 178 struct puffs_node *pn_parent = opc; 179 struct puffs_node *pn = targ; 180 181 if (pn->pn_va.va_type == VDIR) 182 return EPERM; 183 184 dtfs_nukenode(targ, pn_parent, pcn->pcn_name, pcn->pcn_namelen); 185 186 if (pn->pn_va.va_nlink == 0) 187 puffs_setback(puffs_cc_getcc(pu), PUFFS_SETBACK_NOREF_N2); 188 189 return 0; 190 } 191 192 int 193 dtfs_node_mkdir(struct puffs_usermount *pu, void *opc, 194 struct puffs_newinfo *pni, const struct puffs_cn *pcn, 195 const struct vattr *va) 196 { 197 struct puffs_node *pn_parent = opc; 198 struct puffs_node *pn_new; 199 200 pn_new = dtfs_genfile(pn_parent, pcn, VDIR); 201 puffs_setvattr(&pn_new->pn_va, va); 202 203 puffs_newinfo_setcookie(pni, pn_new); 204 205 return 0; 206 } 207 208 int 209 dtfs_node_rmdir(struct puffs_usermount *pu, void *opc, void *targ, 210 const struct puffs_cn *pcn) 211 { 212 struct puffs_node *pn_parent = opc; 213 struct dtfs_file *df = DTFS_CTOF(targ); 214 215 if (!LIST_EMPTY(&df->df_dirents)) 216 return ENOTEMPTY; 217 218 dtfs_nukenode(targ, pn_parent, pcn->pcn_name, pcn->pcn_namelen); 219 puffs_setback(puffs_cc_getcc(pu), PUFFS_SETBACK_NOREF_N2); 220 221 return 0; 222 } 223 224 int 225 dtfs_node_readdir(struct puffs_usermount *pu, void *opc, 226 struct dirent *dent, off_t *readoff, size_t *reslen, 227 const struct puffs_cred *pcr, 228 int *eofflag, off_t *cookies, size_t *ncookies) 229 { 230 struct puffs_node *pn = opc; 231 struct puffs_node *pn_nth; 232 struct dtfs_dirent *dfd_nth; 233 234 if (pn->pn_va.va_type != VDIR) 235 return ENOTDIR; 236 237 dtfs_updatetimes(pn, 1, 0, 0); 238 239 *ncookies = 0; 240 again: 241 if (*readoff == DENT_DOT || *readoff == DENT_DOTDOT) { 242 puffs_gendotdent(&dent, pn->pn_va.va_fileid, *readoff, reslen); 243 (*readoff)++; 244 PUFFS_STORE_DCOOKIE(cookies, ncookies, *readoff); 245 goto again; 246 } 247 248 for (;;) { 249 dfd_nth = dtfs_dirgetnth(pn->pn_data, DENT_ADJ(*readoff)); 250 if (!dfd_nth) { 251 *eofflag = 1; 252 break; 253 } 254 pn_nth = dfd_nth->dfd_node; 255 256 if (!puffs_nextdent(&dent, dfd_nth->dfd_name, 257 pn_nth->pn_va.va_fileid, 258 puffs_vtype2dt(pn_nth->pn_va.va_type), 259 reslen)) 260 break; 261 262 (*readoff)++; 263 PUFFS_STORE_DCOOKIE(cookies, ncookies, *readoff); 264 } 265 266 return 0; 267 } 268 269 int 270 dtfs_node_poll(struct puffs_usermount *pu, void *opc, int *events) 271 { 272 struct dtfs_mount *dtm = puffs_getspecific(pu); 273 struct dtfs_poll dp; 274 struct itimerval it; 275 276 memset(&it, 0, sizeof(struct itimerval)); 277 it.it_value.tv_sec = 4; 278 if (setitimer(ITIMER_REAL, &it, NULL) == -1) 279 return errno; 280 281 dp.dp_pcc = puffs_cc_getcc(pu); 282 LIST_INSERT_HEAD(&dtm->dtm_pollent, &dp, dp_entries); 283 puffs_cc_yield(dp.dp_pcc); 284 285 *events = *events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM); 286 return 0; 287 } 288 289 int 290 dtfs_node_mmap(struct puffs_usermount *pu, void *opc, vm_prot_t prot, 291 const struct puffs_cred *pcr) 292 { 293 struct dtfs_mount *dtm = puffs_getspecific(pu); 294 295 if ((dtm->dtm_allowprot & prot) != prot) 296 return EACCES; 297 298 return 0; 299 } 300 301 int 302 dtfs_node_rename(struct puffs_usermount *pu, void *opc, void *src, 303 const struct puffs_cn *pcn_src, void *targ_dir, void *targ, 304 const struct puffs_cn *pcn_targ) 305 { 306 struct dtfs_dirent *dfd_src; 307 struct dtfs_file *df_targ; 308 struct puffs_node *pn_sdir = opc; 309 struct puffs_node *pn_sfile = src; 310 struct puffs_node *pn_tdir = targ_dir; 311 struct puffs_node *pn_tfile = targ; 312 313 /* check that we don't do the old amigados trick */ 314 if (pn_sfile->pn_va.va_type == VDIR) { 315 if (dtfs_isunder(pn_tdir, pn_sfile)) 316 return EINVAL; 317 318 if ((pcn_src->pcn_namelen == 1 && pcn_src->pcn_name[0]=='.') || 319 opc == src || 320 PCNISDOTDOT(pcn_src) || 321 PCNISDOTDOT(pcn_targ)) { 322 return EINVAL; 323 } 324 } 325 326 dfd_src = dtfs_dirgetbyname(DTFS_PTOF(pn_sdir), 327 pcn_src->pcn_name, pcn_src->pcn_namelen); 328 329 /* does it still exist, or did someone race us here? */ 330 if (dfd_src == NULL) { 331 return ENOENT; 332 } 333 334 /* if there's a target file, nuke it for atomic replacement */ 335 if (pn_tfile) { 336 if (pn_tfile->pn_va.va_type == VDIR) { 337 df_targ = DTFS_CTOF(pn_tfile); 338 if (!LIST_EMPTY(&df_targ->df_dirents)) 339 return ENOTEMPTY; 340 } 341 dtfs_nukenode(pn_tfile, pn_tdir, 342 pcn_targ->pcn_name, pcn_targ->pcn_namelen); 343 } 344 345 /* out with the old */ 346 dtfs_removedent(pn_sdir, dfd_src); 347 /* and in with the new */ 348 dtfs_adddent(pn_tdir, dfd_src); 349 350 /* update name */ 351 free(dfd_src->dfd_name); 352 dfd_src->dfd_name = estrndup(pcn_targ->pcn_name,pcn_targ->pcn_namelen); 353 dfd_src->dfd_namelen = strlen(dfd_src->dfd_name); 354 355 dtfs_updatetimes(src, 0, 1, 0); 356 357 return 0; 358 } 359 360 int 361 dtfs_node_link(struct puffs_usermount *pu, void *opc, void *targ, 362 const struct puffs_cn *pcn) 363 { 364 struct puffs_node *pn_dir = opc; 365 struct dtfs_dirent *dfd; 366 367 dfd = emalloc(sizeof(struct dtfs_dirent)); 368 dfd->dfd_node = targ; 369 dfd->dfd_name = estrndup(pcn->pcn_name, pcn->pcn_namelen); 370 dfd->dfd_namelen = strlen(dfd->dfd_name); 371 dtfs_adddent(pn_dir, dfd); 372 373 dtfs_updatetimes(targ, 0, 1, 0); 374 375 return 0; 376 } 377 378 int 379 dtfs_node_symlink(struct puffs_usermount *pu, void *opc, 380 struct puffs_newinfo *pni, const struct puffs_cn *pcn_src, 381 const struct vattr *va, const char *link_target) 382 { 383 struct puffs_node *pn_parent = opc; 384 struct puffs_node *pn_new; 385 struct dtfs_file *df_new; 386 387 if (va->va_type != VLNK) 388 return ENODEV; 389 390 pn_new = dtfs_genfile(pn_parent, pcn_src, VLNK); 391 puffs_setvattr(&pn_new->pn_va, va); 392 df_new = DTFS_PTOF(pn_new); 393 df_new->df_linktarget = estrdup(link_target); 394 pn_new->pn_va.va_size = strlen(df_new->df_linktarget); 395 396 puffs_newinfo_setcookie(pni, pn_new); 397 398 return 0; 399 } 400 401 int 402 dtfs_node_readlink(struct puffs_usermount *pu, void *opc, 403 const struct puffs_cred *cred, char *linkname, size_t *linklen) 404 { 405 struct dtfs_file *df = DTFS_CTOF(opc); 406 struct puffs_node *pn = opc; 407 408 assert(pn->pn_va.va_type == VLNK); 409 strlcpy(linkname, df->df_linktarget, *linklen); 410 *linklen = strlen(linkname); 411 412 return 0; 413 } 414 415 int 416 dtfs_node_mknod(struct puffs_usermount *pu, void *opc, 417 struct puffs_newinfo *pni, const struct puffs_cn *pcn, 418 const struct vattr *va) 419 { 420 struct puffs_node *pn_parent = opc; 421 struct puffs_node *pn_new; 422 struct dtfs_file *df; 423 424 if (!(va->va_type == VBLK || va->va_type == VCHR 425 || va->va_type == VFIFO)) 426 return EINVAL; 427 428 pn_new = dtfs_genfile(pn_parent, pcn, va->va_type); 429 puffs_setvattr(&pn_new->pn_va, va); 430 431 df = DTFS_PTOF(pn_new); 432 puffs_newinfo_setcookie(pni, pn_new); 433 434 return 0; 435 } 436 437 #define BLOCKOFF(a,b) ((a) & ((b)-1)) 438 #define BLOCKLEFT(a,b) ((b) - BLOCKOFF(a,b)) 439 440 /* 441 * Read operation, used both for VOP_READ and VOP_GETPAGES 442 */ 443 int 444 dtfs_node_read(struct puffs_usermount *pu, void *opc, uint8_t *buf, 445 off_t offset, size_t *resid, const struct puffs_cred *pcr, int ioflag) 446 { 447 struct puffs_node *pn = opc; 448 struct dtfs_file *df = DTFS_CTOF(opc); 449 quad_t xfer, origxfer; 450 uint8_t *src, *dest; 451 size_t copylen; 452 453 if (pn->pn_va.va_type != VREG) 454 return EISDIR; 455 456 xfer = MIN(*resid, df->df_datalen - offset); 457 if (xfer < 0) 458 return EINVAL; 459 460 dest = buf; 461 origxfer = xfer; 462 while (xfer > 0) { 463 copylen = MIN(xfer, BLOCKLEFT(offset, DTFS_BLOCKSIZE)); 464 src = df->df_blocks[BLOCKNUM(offset, DTFS_BLOCKSHIFT)] 465 + BLOCKOFF(offset, DTFS_BLOCKSIZE); 466 memcpy(dest, src, copylen); 467 offset += copylen; 468 dest += copylen; 469 xfer -= copylen; 470 } 471 *resid -= origxfer; 472 473 dtfs_updatetimes(pn, 1, 0, 0); 474 475 return 0; 476 } 477 478 /* 479 * write operation on the wing 480 */ 481 int 482 dtfs_node_write(struct puffs_usermount *pu, void *opc, uint8_t *buf, 483 off_t offset, size_t *resid, const struct puffs_cred *pcr, int ioflag) 484 { 485 struct puffs_node *pn = opc; 486 struct dtfs_file *df = DTFS_CTOF(opc); 487 uint8_t *src, *dest; 488 size_t copylen; 489 490 if (pn->pn_va.va_type != VREG) 491 return EISDIR; 492 493 if (ioflag & PUFFS_IO_APPEND) 494 offset = pn->pn_va.va_size; 495 496 if (*resid + offset > pn->pn_va.va_size) 497 dtfs_setsize(pn, *resid + offset); 498 499 src = buf; 500 while (*resid > 0) { 501 int i; 502 copylen = MIN(*resid, BLOCKLEFT(offset, DTFS_BLOCKSIZE)); 503 i = BLOCKNUM(offset, DTFS_BLOCKSHIFT); 504 dest = df->df_blocks[i] 505 + BLOCKOFF(offset, DTFS_BLOCKSIZE); 506 memcpy(dest, src, copylen); 507 offset += copylen; 508 dest += copylen; 509 *resid -= copylen; 510 } 511 512 dtfs_updatetimes(pn, 0, 1, 1); 513 514 return 0; 515 } 516 517 int 518 dtfs_node_inactive(struct puffs_usermount *pu, puffs_cookie_t opc) 519 { 520 struct puffs_node *pn = opc; 521 522 if (pn->pn_va.va_nlink == 0) 523 puffs_setback(puffs_cc_getcc(pu), PUFFS_SETBACK_NOREF_N1); 524 return 0; 525 } 526 527 int 528 dtfs_node_reclaim(struct puffs_usermount *pu, void *opc) 529 { 530 struct puffs_node *pn = opc; 531 532 if (pn->pn_va.va_nlink == 0) 533 dtfs_freenode(pn); 534 535 return 0; 536 } 537
Indexes created Wed Oct 01 07:09:59 GMT 2025