perfuse.c revision 1.17
1 /* $NetBSD: perfuse.c,v 1.17 2011/08/09 06:58:33 manu Exp $ */ 2 3 /*- 4 * Copyright (c) 2010-2011 Emmanuel Dreyfus. 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS 16 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 17 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 19 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <stdio.h> 29 #include <unistd.h> 30 #include <stdlib.h> 31 #include <fcntl.h> 32 #include <string.h> 33 #include <errno.h> 34 #include <puffs.h> 35 #include <sys/types.h> 36 #include <sys/socket.h> 37 #include <sys/extattr.h> 38 #include <sys/un.h> 39 #include <machine/vmparam.h> 40 41 #define LIBPERFUSE 42 #include "perfuse.h" 43 #include "perfuse_if.h" 44 #include "perfuse_priv.h" 45 46 int perfuse_diagflags = 0; /* global used only in DPRINTF/DERR/DWARN */ 47 extern char **environ; 48 49 static struct perfuse_state *init_state(void); 50 static int get_fd(const char *); 51 52 53 static struct perfuse_state * 54 init_state(void) 55 { 56 struct perfuse_state *ps; 57 char opts[1024]; 58 59 if ((ps = malloc(sizeof(*ps))) == NULL) 60 DERR(EX_OSERR, "malloc failed"); 61 62 (void)memset(ps, 0, sizeof(*ps)); 63 ps->ps_max_write = UINT_MAX; 64 ps->ps_max_readahead = UINT_MAX; 65 66 /* 67 * Most of the time, access() is broken because the filesystem 68 * performs the check with root privileges. glusterfs will do that 69 * if the Linux-specific setfsuid() is missing, for instance. 70 */ 71 ps->ps_flags |= PS_NO_ACCESS; 72 73 /* 74 * This is a temporary way to toggle access and creat usage. 75 * It would be nice if that could be provided as mount options, 76 * but that will not be obvious to do. 77 */ 78 if (getenv_r("PERFUSE_OPTIONS", opts, sizeof(opts)) != -1) { 79 char *optname; 80 char *last; 81 82 for ((optname = strtok_r(opts, ",", &last)); 83 optname != NULL; 84 (optname = strtok_r(NULL, ",", &last))) { 85 if (strcmp(optname, "enable_access") == 0) 86 ps->ps_flags &= ~PS_NO_ACCESS; 87 88 if (strcmp(optname, "disable_access") == 0) 89 ps->ps_flags |= PS_NO_ACCESS; 90 91 if (strcmp(optname, "enable_creat") == 0) 92 ps->ps_flags &= ~PS_NO_CREAT; 93 94 if (strcmp(optname, "disable_creat") == 0) 95 ps->ps_flags |= PS_NO_CREAT; 96 } 97 } 98 99 100 return ps; 101 } 102 103 104 static int 105 get_fd(data) 106 const char *data; 107 { 108 char *string; 109 const char fdopt[] = "fd="; 110 char *lastp; 111 char *opt; 112 int fd = -1; 113 114 if ((string = strdup(data)) == NULL) 115 return -1; 116 117 for (opt = strtok_r(string, ",", &lastp); 118 opt != NULL; 119 opt = strtok_r(NULL, ",", &lastp)) { 120 if (strncmp(opt, fdopt, strlen(fdopt)) == 0) { 121 fd = atoi(opt + strlen(fdopt)); 122 break; 123 } 124 } 125 126 /* 127 * No file descriptor found 128 */ 129 if (fd == -1) 130 errno = EINVAL; 131 132 free(string); 133 return fd; 134 135 } 136 137 int 138 perfuse_open(path, flags, mode) 139 const char *path; 140 int flags; 141 mode_t mode; 142 { 143 int sv[2]; 144 struct sockaddr_un sun; 145 struct sockaddr *sa; 146 char progname[] = _PATH_PERFUSED; 147 char minus_i[] = "-i"; 148 char fdstr[16]; 149 char *const argv[] = { progname, minus_i, fdstr, NULL}; 150 uint32_t opt; 151 uint32_t optlen; 152 int sock_type = SOCK_SEQPACKET; 153 154 if (strcmp(path, _PATH_FUSE) != 0) 155 return open(path, flags, mode); 156 157 /* 158 * Try SOCK_SEQPACKET then SOCK_DGRAM if unavailable 159 */ 160 if ((sv[0] = socket(PF_LOCAL, SOCK_SEQPACKET, 0)) == -1) { 161 sock_type = SOCK_DGRAM; 162 DWARNX("SEQPACKET local sockets unavailable, using less " 163 "reliable DGRAM sockets. Expect file operation hangs."); 164 165 if ((sv[0] = socket(PF_LOCAL, SOCK_DGRAM, 0)) == -1) { 166 #ifdef PERFUSE_DEBUG 167 DWARN("%s:%d socket failed: %s", __func__, __LINE__); 168 #endif 169 return -1; 170 } 171 } 172 173 /* 174 * Set a buffer lentgh large enough so that any FUSE packet 175 * will fit. 176 */ 177 opt = FUSE_BUFSIZE; 178 optlen = sizeof(opt); 179 if (setsockopt(sv[0], SOL_SOCKET, SO_SNDBUF, &opt, optlen) != 0) 180 DWARN("%s: setsockopt SO_SNDBUF to %d failed", __func__, opt); 181 182 opt = FUSE_BUFSIZE; 183 optlen = sizeof(opt); 184 if (setsockopt(sv[0], SOL_SOCKET, SO_RCVBUF, &opt, optlen) != 0) 185 DWARN("%s: setsockopt SO_RCVBUF to %d failed", __func__, opt); 186 187 sa = (struct sockaddr *)(void *)&sun; 188 sun.sun_len = sizeof(sun); 189 sun.sun_family = AF_LOCAL; 190 (void)strcpy(sun.sun_path, path); 191 192 if (connect(sv[0], sa, (socklen_t)sun.sun_len) == 0) 193 return sv[0]; 194 195 /* 196 * Attempt to run perfused on our own 197 * if it does not run yet; In that case 198 * we will talk using a socketpair 199 * instead of /dev/fuse. 200 */ 201 if (socketpair(PF_LOCAL, sock_type, 0, sv) != 0) { 202 DWARN("%s:%d: socketpair failed", __func__, __LINE__); 203 return -1; 204 } 205 206 /* 207 * Set a buffer lentgh large enough so that any FUSE packet 208 * will fit. 209 */ 210 opt = 4 * FUSE_BUFSIZE; 211 optlen = sizeof(opt); 212 if (setsockopt(sv[0], SOL_SOCKET, SO_SNDBUF, &opt, optlen) != 0) 213 DWARN("%s: setsockopt SO_SNDBUF to %d failed", __func__, opt); 214 215 opt = 4 * FUSE_BUFSIZE; 216 optlen = sizeof(opt); 217 if (setsockopt(sv[0], SOL_SOCKET, SO_RCVBUF, &opt, optlen) != 0) 218 DWARN("%s: setsockopt SO_RCVBUF to %d failed", __func__, opt); 219 220 opt = 4 * FUSE_BUFSIZE; 221 optlen = sizeof(opt); 222 if (setsockopt(sv[1], SOL_SOCKET, SO_SNDBUF, &opt, optlen) != 0) 223 DWARN("%s: setsockopt SO_SNDBUF to %d failed", __func__, opt); 224 225 opt = 4 * FUSE_BUFSIZE; 226 optlen = sizeof(opt); 227 if (setsockopt(sv[1], SOL_SOCKET, SO_RCVBUF, &opt, optlen) != 0) 228 DWARN("%s: setsockopt SO_RCVBUF to %d failed", __func__, opt); 229 230 /* 231 * Request peer credentials. This musr be done before first 232 * frame is sent. 233 */ 234 opt = 1; 235 optlen = sizeof(opt); 236 if (setsockopt(sv[1], 0, LOCAL_CREDS, &opt, optlen) != 0) 237 DWARN("%s: setsockopt LOCAL_CREDS failed", __func__); 238 239 (void)sprintf(fdstr, "%d", sv[1]); 240 241 switch(fork()) { 242 case -1: 243 #ifdef PERFUSE_DEBUG 244 DWARN("%s:%d: fork failed", __func__, __LINE__); 245 #endif 246 return -1; 247 /* NOTREACHED */ 248 break; 249 case 0: 250 (void)execve(argv[0], argv, environ); 251 #ifdef PERFUSE_DEBUG 252 DWARN("%s:%d: execve failed", __func__, __LINE__); 253 #endif 254 return -1; 255 /* NOTREACHED */ 256 break; 257 default: 258 break; 259 } 260 261 return sv[0]; 262 } 263 264 int 265 perfuse_mount(source, target, filesystemtype, mountflags, data) 266 const char *source; 267 const char *target; 268 const char *filesystemtype; 269 long mountflags; 270 const void *data; 271 { 272 int s; 273 size_t len; 274 struct perfuse_mount_out *pmo; 275 struct sockaddr_storage ss; 276 struct sockaddr_un *sun; 277 struct sockaddr *sa; 278 socklen_t sa_len; 279 size_t sock_len; 280 char *frame; 281 char *cp; 282 283 #ifdef PERFUSE_DEBUG 284 if (perfuse_diagflags & PDF_MISC) 285 DPRINTF("%s(\"%s\", \"%s\", \"%s\", 0x%lx, \"%s\")\n", 286 __func__, source, target, filesystemtype, 287 mountflags, (const char *)data); 288 #endif 289 290 if ((s = get_fd(data)) == -1) 291 return -1; 292 293 /* 294 * If we are connected to /dev/fuse, we need a second 295 * socket to get replies from perfused. 296 * XXX This socket is not removed at exit time yet 297 */ 298 sock_len = 0; 299 sa = (struct sockaddr *)(void *)&ss; 300 sun = (struct sockaddr_un *)(void *)&ss; 301 sa_len = sizeof(ss); 302 if ((getpeername(s, sa, &sa_len) == 0) && 303 (sa->sa_family = AF_LOCAL) && 304 (strcmp(sun->sun_path, _PATH_FUSE) == 0)) { 305 306 sun->sun_len = sizeof(*sun); 307 sun->sun_family = AF_LOCAL; 308 (void)sprintf(sun->sun_path, "%s/%s-%d", 309 _PATH_TMP, getprogname(), getpid()); 310 311 if (bind(s, sa, (socklen_t)sa->sa_len) != 0) 312 DERR(EX_OSERR, "%s:%d bind to \"%s\" failed", 313 __func__, __LINE__, sun->sun_path); 314 315 sock_len = strlen(sun->sun_path) + 1; 316 } 317 318 len = sizeof(*pmo); 319 len += source ? (uint32_t)strlen(source) + 1 : 0; 320 len += target ? (uint32_t)strlen(target) + 1 : 0; 321 len += filesystemtype ? (uint32_t)strlen(filesystemtype) + 1 : 0; 322 len += data ? (uint32_t)strlen(data) + 1 : 0; 323 len += sock_len; 324 325 if ((frame = malloc(len)) == NULL) { 326 #ifdef PERFUSE_DEBUG 327 if (perfuse_diagflags & PDF_MISC) 328 DWARN("%s:%d malloc failed", __func__, __LINE__); 329 #endif 330 return -1; 331 } 332 333 pmo = (struct perfuse_mount_out *)(void *)frame; 334 pmo->pmo_len = (uint32_t)len; 335 pmo->pmo_error = 0; 336 pmo->pmo_unique = (uint64_t)-1; 337 (void)strcpy(pmo->pmo_magic, PERFUSE_MOUNT_MAGIC); 338 339 pmo->pmo_source_len = source ? (uint32_t)strlen(source) + 1 : 0; 340 pmo->pmo_target_len = target ? (uint32_t)strlen(target) + 1: 0; 341 pmo->pmo_filesystemtype_len = 342 filesystemtype ? (uint32_t)strlen(filesystemtype) + 1 : 0; 343 pmo->pmo_mountflags = (uint32_t)mountflags; 344 pmo->pmo_data_len = data ? (uint32_t)strlen(data) + 1 : 0; 345 pmo->pmo_sock_len = (uint32_t)sock_len; 346 347 cp = (char *)(void *)(pmo + 1); 348 349 if (source) { 350 (void)strcpy(cp, source); 351 cp += pmo->pmo_source_len; 352 } 353 354 if (target) { 355 (void)strcpy(cp, target); 356 cp += pmo->pmo_target_len; 357 } 358 359 if (filesystemtype) { 360 (void)strcpy(cp, filesystemtype); 361 cp += pmo->pmo_filesystemtype_len; 362 } 363 364 if (data) { 365 (void)strcpy(cp, data); 366 cp += pmo->pmo_data_len; 367 } 368 369 if (sock_len != 0) { 370 (void)strcpy(cp, sun->sun_path); 371 cp += pmo->pmo_sock_len; 372 } 373 374 if (send(s, frame, len, MSG_NOSIGNAL) != (ssize_t)len) { 375 #ifdef PERFUSE_DEBUG 376 DWARN("%s:%d sendto failed", __func__, __LINE__); 377 #endif 378 return -1; 379 } 380 381 return 0; 382 } 383 384 385 uint64_t 386 perfuse_next_unique(pu) 387 struct puffs_usermount *pu; 388 { 389 struct perfuse_state *ps; 390 391 ps = puffs_getspecific(pu); 392 393 return ps->ps_unique++; 394 } 395 396 struct puffs_usermount * 397 perfuse_init(pc, pmi) 398 struct perfuse_callbacks *pc; 399 struct perfuse_mount_info *pmi; 400 { 401 struct perfuse_state *ps; 402 struct puffs_usermount *pu; 403 struct puffs_ops *pops; 404 const char *source = _PATH_PUFFS; 405 char *fstype; 406 unsigned int puffs_flags; 407 struct puffs_node *pn_root; 408 struct puffs_pathobj *po_root; 409 410 ps = init_state(); 411 ps->ps_owner_uid = pmi->pmi_uid; 412 413 if (pmi->pmi_source) { 414 if ((ps->ps_source = strdup(pmi->pmi_source)) == NULL) 415 DERR(EX_OSERR, "strdup failed"); 416 417 source = ps->ps_source; 418 } 419 420 if (pmi->pmi_filesystemtype) { 421 size_t len; 422 423 ps->ps_filesystemtype = strdup(pmi->pmi_filesystemtype); 424 if (ps->ps_filesystemtype == NULL) 425 DERR(EX_OSERR, "strdup failed"); 426 427 len = sizeof("perfuse|") + strlen(ps->ps_filesystemtype) + 1; 428 if ((fstype = malloc(len)) == NULL) 429 DERR(EX_OSERR, "malloc failed"); 430 431 (void)sprintf(fstype, "perfuse|%s", ps->ps_filesystemtype); 432 } else { 433 if ((fstype = strdup("perfuse")) == NULL) 434 DERR(EX_OSERR, "strdup failed"); 435 } 436 437 if ((ps->ps_target = strdup(pmi->pmi_target)) == NULL) 438 DERR(EX_OSERR, "strdup failed"); 439 440 ps->ps_mountflags = pmi->pmi_mountflags; 441 442 /* 443 * Some options are forbidden for non root users 444 */ 445 if (ps->ps_owner_uid != 0) 446 ps->ps_mountflags |= MNT_NOSUID|MNT_NODEV; 447 448 PUFFSOP_INIT(pops); 449 PUFFSOP_SET(pops, perfuse, fs, unmount); 450 PUFFSOP_SET(pops, perfuse, fs, statvfs); 451 PUFFSOP_SET(pops, perfuse, fs, sync); 452 PUFFSOP_SET(pops, perfuse, node, lookup); 453 PUFFSOP_SET(pops, perfuse, node, create); 454 PUFFSOP_SET(pops, perfuse, node, mknod); 455 PUFFSOP_SET(pops, perfuse, node, open); 456 PUFFSOP_SET(pops, perfuse, node, close); 457 PUFFSOP_SET(pops, perfuse, node, access); 458 PUFFSOP_SET(pops, perfuse, node, getattr); 459 PUFFSOP_SET(pops, perfuse, node, setattr); 460 PUFFSOP_SET(pops, perfuse, node, poll); 461 #if 0 462 PUFFSOP_SET(pops, perfuse, node, mmap); 463 #endif 464 PUFFSOP_SET(pops, perfuse, node, fsync); 465 PUFFSOP_SET(pops, perfuse, node, seek); 466 PUFFSOP_SET(pops, perfuse, node, remove); 467 PUFFSOP_SET(pops, perfuse, node, link); 468 PUFFSOP_SET(pops, perfuse, node, rename); 469 PUFFSOP_SET(pops, perfuse, node, mkdir); 470 PUFFSOP_SET(pops, perfuse, node, rmdir); 471 PUFFSOP_SET(pops, perfuse, node, symlink); 472 PUFFSOP_SET(pops, perfuse, node, readdir); 473 PUFFSOP_SET(pops, perfuse, node, readlink); 474 PUFFSOP_SET(pops, perfuse, node, reclaim); 475 PUFFSOP_SET(pops, perfuse, node, inactive); 476 PUFFSOP_SET(pops, perfuse, node, print); 477 PUFFSOP_SET(pops, perfuse, node, advlock); 478 PUFFSOP_SET(pops, perfuse, node, read); 479 PUFFSOP_SET(pops, perfuse, node, write); 480 #ifdef PUFFS_EXTNAMELEN 481 PUFFSOP_SET(pops, perfuse, node, getextattr); 482 PUFFSOP_SET(pops, perfuse, node, setextattr); 483 PUFFSOP_SET(pops, perfuse, node, listextattr); 484 PUFFSOP_SET(pops, perfuse, node, deleteextattr); 485 #endif /* PUFFS_EXTNAMELEN */ 486 487 /* 488 * We used to have PUFFS_KFLAG_WTCACHE here, which uses the 489 * page cache (highly desirable to get mmap(2)), but still sends 490 * all writes to the filesystem. In fact it does not send the 491 * data written, but the pages that contain it. 492 * 493 * There is a nasty bug hidden somewhere, possibly in libpuffs' 494 * VOP_FSYNC, which sends an asynchronous PUFFS_SETATTR that 495 * update file size. When writes are in progress, it will cause 496 * the file to be truncated and we get a zero-filled chunk at the 497 * beginning of a page. Removing PUFFS_KFLAG_WTCACHE fixes that 498 * problem. 499 * 500 * The other consequences are that changes will not be propagated 501 * immediatly to the filesystem, and we get a huge performance gain 502 * because much less requests are sent. A test case for the above 503 * mentioned bug got its execution time slashed by factor 50. 504 */ 505 puffs_flags = 0; 506 507 if (perfuse_diagflags & PDF_PUFFS) 508 puffs_flags |= PUFFS_FLAG_OPDUMP; 509 510 if ((pu = puffs_init(pops, source, fstype, ps, puffs_flags)) == NULL) 511 DERR(EX_OSERR, "puffs_init failed"); 512 513 ps->ps_pu = pu; 514 515 /* 516 * Setup filesystem root 517 */ 518 pn_root = perfuse_new_pn(pu, "", NULL); 519 PERFUSE_NODE_DATA(pn_root)->pnd_ino = FUSE_ROOT_ID; 520 PERFUSE_NODE_DATA(pn_root)->pnd_parent = pn_root; 521 puffs_setroot(pu, pn_root); 522 ps->ps_fsid = pn_root->pn_va.va_fsid; 523 524 po_root = puffs_getrootpathobj(pu); 525 if ((po_root->po_path = strdup("/")) == NULL) 526 DERRX(EX_OSERR, "perfuse_mount_start() failed"); 527 528 po_root->po_len = 1; 529 puffs_path_buildhash(pu, po_root); 530 531 puffs_vattr_null(&pn_root->pn_va); 532 pn_root->pn_va.va_type = VDIR; 533 pn_root->pn_va.va_mode = 0755; 534 535 ps->ps_root = pn_root; 536 537 /* 538 * Callbacks 539 */ 540 ps->ps_new_msg = pc->pc_new_msg; 541 ps->ps_xchg_msg = pc->pc_xchg_msg; 542 ps->ps_destroy_msg = pc->pc_destroy_msg; 543 ps->ps_get_inhdr = pc->pc_get_inhdr; 544 ps->ps_get_inpayload = pc->pc_get_inpayload; 545 ps->ps_get_outhdr = pc->pc_get_outhdr; 546 ps->ps_get_outpayload = pc->pc_get_outpayload; 547 ps->ps_umount = pc->pc_umount; 548 549 return pu; 550 } 551 552 void 553 perfuse_setspecific(pu, priv) 554 struct puffs_usermount *pu; 555 void *priv; 556 { 557 struct perfuse_state *ps; 558 559 ps = puffs_getspecific(pu); 560 ps->ps_private = priv; 561 562 return; 563 } 564 565 void * 566 perfuse_getspecific(pu) 567 struct puffs_usermount *pu; 568 { 569 struct perfuse_state *ps; 570 571 ps = puffs_getspecific(pu); 572 573 return ps->ps_private; 574 } 575 576 int 577 perfuse_inloop(pu) 578 struct puffs_usermount *pu; 579 { 580 struct perfuse_state *ps; 581 582 ps = puffs_getspecific(pu); 583 584 return ps->ps_flags & PS_INLOOP; 585 } 586 587 int 588 perfuse_mainloop(pu) 589 struct puffs_usermount *pu; 590 { 591 struct perfuse_state *ps; 592 593 ps = puffs_getspecific(pu); 594 595 ps->ps_flags |= PS_INLOOP; 596 if (puffs_mainloop(ps->ps_pu) != 0) { 597 DERR(EX_OSERR, "puffs_mainloop failed"); 598 return -1; 599 } 600 601 /* 602 * Normal exit after unmount 603 */ 604 return 0; 605 } 606 607 /* ARGSUSED0 */ 608 uint64_t 609 perfuse_get_ino(pu, opc) 610 struct puffs_usermount *pu; 611 puffs_cookie_t opc; 612 { 613 return PERFUSE_NODE_DATA(opc)->pnd_ino; 614 } 615 616 int 617 perfuse_unmount(pu) 618 struct puffs_usermount *pu; 619 { 620 struct perfuse_state *ps; 621 622 ps = puffs_getspecific(pu); 623 624 return unmount(ps->ps_target, MNT_FORCE); 625 } 626
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