puffs_vnops.c revision 1.222
1 /* $NetBSD: puffs_vnops.c,v 1.222 2021/07/24 21:31:38 andvar Exp $ */ 2 3 /* 4 * Copyright (c) 2005, 2006, 2007 Antti Kantee. All Rights Reserved. 5 * 6 * Development of this software was supported by the 7 * Google Summer of Code program and the Ulla Tuominen Foundation. 8 * The Google SoC project was mentored by Bill Studenmund. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 20 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 22 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR 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 OR 25 * 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 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: puffs_vnops.c,v 1.222 2021/07/24 21:31:38 andvar Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/buf.h> 37 #include <sys/lockf.h> 38 #include <sys/malloc.h> 39 #include <sys/mount.h> 40 #include <sys/namei.h> 41 #include <sys/vnode.h> 42 #include <sys/proc.h> 43 #include <sys/kernel.h> /* For hz, getticks() */ 44 45 #include <uvm/uvm.h> 46 47 #include <fs/puffs/puffs_msgif.h> 48 #include <fs/puffs/puffs_sys.h> 49 50 #include <miscfs/fifofs/fifo.h> 51 #include <miscfs/genfs/genfs.h> 52 #include <miscfs/specfs/specdev.h> 53 54 int puffs_vnop_lookup(void *); 55 int puffs_vnop_create(void *); 56 int puffs_vnop_access(void *); 57 int puffs_vnop_mknod(void *); 58 int puffs_vnop_open(void *); 59 int puffs_vnop_close(void *); 60 int puffs_vnop_getattr(void *); 61 int puffs_vnop_setattr(void *); 62 int puffs_vnop_reclaim(void *); 63 int puffs_vnop_readdir(void *); 64 int puffs_vnop_poll(void *); 65 int puffs_vnop_fsync(void *); 66 int puffs_vnop_seek(void *); 67 int puffs_vnop_remove(void *); 68 int puffs_vnop_mkdir(void *); 69 int puffs_vnop_rmdir(void *); 70 int puffs_vnop_link(void *); 71 int puffs_vnop_readlink(void *); 72 int puffs_vnop_symlink(void *); 73 int puffs_vnop_rename(void *); 74 int puffs_vnop_read(void *); 75 int puffs_vnop_write(void *); 76 int puffs_vnop_fallocate(void *); 77 int puffs_vnop_fdiscard(void *); 78 int puffs_vnop_fcntl(void *); 79 int puffs_vnop_ioctl(void *); 80 int puffs_vnop_inactive(void *); 81 int puffs_vnop_print(void *); 82 int puffs_vnop_pathconf(void *); 83 int puffs_vnop_advlock(void *); 84 int puffs_vnop_strategy(void *); 85 int puffs_vnop_bmap(void *); 86 int puffs_vnop_mmap(void *); 87 int puffs_vnop_getpages(void *); 88 int puffs_vnop_abortop(void *); 89 int puffs_vnop_getextattr(void *); 90 int puffs_vnop_setextattr(void *); 91 int puffs_vnop_listextattr(void *); 92 int puffs_vnop_deleteextattr(void *); 93 94 int puffs_vnop_spec_read(void *); 95 int puffs_vnop_spec_write(void *); 96 int puffs_vnop_fifo_read(void *); 97 int puffs_vnop_fifo_write(void *); 98 99 int puffs_vnop_checkop(void *); 100 101 int (**puffs_vnodeop_p)(void *); 102 const struct vnodeopv_entry_desc puffs_vnodeop_entries[] = { 103 { &vop_default_desc, vn_default_error }, 104 { &vop_parsepath_desc, genfs_parsepath }, /* parsepath */ 105 { &vop_lookup_desc, puffs_vnop_lookup }, /* REAL lookup */ 106 { &vop_create_desc, puffs_vnop_checkop }, /* create */ 107 { &vop_mknod_desc, puffs_vnop_checkop }, /* mknod */ 108 { &vop_open_desc, puffs_vnop_open }, /* REAL open */ 109 { &vop_close_desc, puffs_vnop_checkop }, /* close */ 110 { &vop_access_desc, puffs_vnop_access }, /* REAL access */ 111 { &vop_accessx_desc, genfs_accessx }, /* accessx */ 112 { &vop_getattr_desc, puffs_vnop_checkop }, /* getattr */ 113 { &vop_setattr_desc, puffs_vnop_checkop }, /* setattr */ 114 { &vop_read_desc, puffs_vnop_checkop }, /* read */ 115 { &vop_write_desc, puffs_vnop_checkop }, /* write */ 116 { &vop_fallocate_desc, puffs_vnop_fallocate }, /* fallocate */ 117 { &vop_fdiscard_desc, puffs_vnop_fdiscard }, /* fdiscard */ 118 { &vop_fsync_desc, puffs_vnop_fsync }, /* REAL fsync */ 119 { &vop_seek_desc, puffs_vnop_checkop }, /* seek */ 120 { &vop_remove_desc, puffs_vnop_checkop }, /* remove */ 121 { &vop_link_desc, puffs_vnop_checkop }, /* link */ 122 { &vop_rename_desc, puffs_vnop_checkop }, /* rename */ 123 { &vop_mkdir_desc, puffs_vnop_checkop }, /* mkdir */ 124 { &vop_rmdir_desc, puffs_vnop_checkop }, /* rmdir */ 125 { &vop_symlink_desc, puffs_vnop_checkop }, /* symlink */ 126 { &vop_readdir_desc, puffs_vnop_checkop }, /* readdir */ 127 { &vop_readlink_desc, puffs_vnop_checkop }, /* readlink */ 128 { &vop_getpages_desc, puffs_vnop_checkop }, /* getpages */ 129 { &vop_putpages_desc, genfs_putpages }, /* REAL putpages */ 130 { &vop_pathconf_desc, puffs_vnop_checkop }, /* pathconf */ 131 { &vop_advlock_desc, puffs_vnop_advlock }, /* advlock */ 132 { &vop_strategy_desc, puffs_vnop_strategy }, /* REAL strategy */ 133 { &vop_revoke_desc, genfs_revoke }, /* REAL revoke */ 134 { &vop_abortop_desc, puffs_vnop_abortop }, /* REAL abortop */ 135 { &vop_inactive_desc, puffs_vnop_inactive }, /* REAL inactive */ 136 { &vop_reclaim_desc, puffs_vnop_reclaim }, /* REAL reclaim */ 137 { &vop_lock_desc, genfs_lock }, /* REAL lock */ 138 { &vop_unlock_desc, genfs_unlock }, /* REAL unlock */ 139 { &vop_bmap_desc, puffs_vnop_bmap }, /* REAL bmap */ 140 { &vop_print_desc, puffs_vnop_print }, /* REAL print */ 141 { &vop_islocked_desc, genfs_islocked }, /* REAL islocked */ 142 { &vop_bwrite_desc, genfs_nullop }, /* REAL bwrite */ 143 { &vop_mmap_desc, puffs_vnop_mmap }, /* REAL mmap */ 144 { &vop_poll_desc, puffs_vnop_poll }, /* REAL poll */ 145 { &vop_getextattr_desc, puffs_vnop_getextattr }, /* getextattr */ 146 { &vop_setextattr_desc, puffs_vnop_setextattr }, /* setextattr */ 147 { &vop_listextattr_desc, puffs_vnop_listextattr }, /* listextattr */ 148 { &vop_deleteextattr_desc, puffs_vnop_deleteextattr },/* deleteextattr */ 149 #if 0 150 { &vop_openextattr_desc, puffs_vnop_checkop }, /* openextattr */ 151 { &vop_closeextattr_desc, puffs_vnop_checkop }, /* closeextattr */ 152 #endif 153 { &vop_kqfilter_desc, genfs_eopnotsupp }, /* kqfilter XXX */ 154 { NULL, NULL } 155 }; 156 const struct vnodeopv_desc puffs_vnodeop_opv_desc = 157 { &puffs_vnodeop_p, puffs_vnodeop_entries }; 158 159 160 int (**puffs_specop_p)(void *); 161 const struct vnodeopv_entry_desc puffs_specop_entries[] = { 162 { &vop_default_desc, vn_default_error }, 163 GENFS_SPECOP_ENTRIES, 164 { &vop_close_desc, spec_close }, /* spec_close */ 165 { &vop_access_desc, puffs_vnop_checkop }, /* access */ 166 { &vop_accessx_desc, genfs_accessx }, /* accessx */ 167 { &vop_getattr_desc, puffs_vnop_checkop }, /* getattr */ 168 { &vop_setattr_desc, puffs_vnop_checkop }, /* setattr */ 169 { &vop_read_desc, puffs_vnop_spec_read }, /* update, read */ 170 { &vop_write_desc, puffs_vnop_spec_write }, /* update, write */ 171 { &vop_fcntl_desc, genfs_fcntl }, /* dummy */ 172 { &vop_fsync_desc, spec_fsync }, /* vflushbuf */ 173 { &vop_inactive_desc, puffs_vnop_inactive }, /* REAL inactive */ 174 { &vop_reclaim_desc, puffs_vnop_reclaim }, /* REAL reclaim */ 175 { &vop_lock_desc, genfs_lock }, /* REAL lock */ 176 { &vop_unlock_desc, genfs_unlock }, /* REAL unlock */ 177 { &vop_print_desc, puffs_vnop_print }, /* REAL print */ 178 { &vop_islocked_desc, genfs_islocked }, /* REAL islocked */ 179 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 180 { &vop_getextattr_desc, puffs_vnop_checkop }, /* getextattr */ 181 { &vop_setextattr_desc, puffs_vnop_checkop }, /* setextattr */ 182 { &vop_listextattr_desc, puffs_vnop_checkop }, /* listextattr */ 183 { &vop_deleteextattr_desc, puffs_vnop_checkop },/* deleteextattr */ 184 #if 0 185 { &vop_openextattr_desc, _openextattr }, /* openextattr */ 186 { &vop_closeextattr_desc, _closeextattr }, /* closeextattr */ 187 #endif 188 { NULL, NULL } 189 }; 190 const struct vnodeopv_desc puffs_specop_opv_desc = 191 { &puffs_specop_p, puffs_specop_entries }; 192 193 194 int (**puffs_fifoop_p)(void *); 195 const struct vnodeopv_entry_desc puffs_fifoop_entries[] = { 196 { &vop_default_desc, vn_default_error }, 197 GENFS_FIFOOP_ENTRIES, 198 { &vop_close_desc, vn_fifo_bypass }, /* close */ 199 { &vop_access_desc, puffs_vnop_checkop }, /* access */ 200 { &vop_accessx_desc, genfs_accessx }, /* accessx */ 201 { &vop_getattr_desc, puffs_vnop_checkop }, /* getattr */ 202 { &vop_setattr_desc, puffs_vnop_checkop }, /* setattr */ 203 { &vop_read_desc, puffs_vnop_fifo_read }, /* read, update */ 204 { &vop_write_desc, puffs_vnop_fifo_write }, /* write, update */ 205 { &vop_fcntl_desc, genfs_fcntl }, /* dummy */ 206 { &vop_fsync_desc, vn_fifo_bypass }, /* genfs_nullop*/ 207 { &vop_inactive_desc, puffs_vnop_inactive }, /* REAL inactive */ 208 { &vop_reclaim_desc, puffs_vnop_reclaim }, /* REAL reclaim */ 209 { &vop_lock_desc, genfs_lock }, /* REAL lock */ 210 { &vop_unlock_desc, genfs_unlock }, /* REAL unlock */ 211 { &vop_strategy_desc, vn_fifo_bypass }, /* genfs_badop */ 212 { &vop_print_desc, puffs_vnop_print }, /* REAL print */ 213 { &vop_islocked_desc, genfs_islocked }, /* REAL islocked */ 214 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 215 #if 0 216 { &vop_openextattr_desc, _openextattr }, /* openextattr */ 217 { &vop_closeextattr_desc, _closeextattr }, /* closeextattr */ 218 #endif 219 { &vop_getextattr_desc, puffs_vnop_checkop }, /* getextattr */ 220 { &vop_setextattr_desc, puffs_vnop_checkop }, /* setextattr */ 221 { &vop_listextattr_desc, puffs_vnop_checkop }, /* listextattr */ 222 { &vop_deleteextattr_desc, puffs_vnop_checkop }, /* deleteextattr */ 223 { NULL, NULL } 224 }; 225 const struct vnodeopv_desc puffs_fifoop_opv_desc = 226 { &puffs_fifoop_p, puffs_fifoop_entries }; 227 228 229 /* "real" vnode operations */ 230 int (**puffs_msgop_p)(void *); 231 const struct vnodeopv_entry_desc puffs_msgop_entries[] = { 232 { &vop_default_desc, vn_default_error }, 233 { &vop_parsepath_desc, genfs_parsepath }, 234 { &vop_create_desc, puffs_vnop_create }, /* create */ 235 { &vop_mknod_desc, puffs_vnop_mknod }, /* mknod */ 236 { &vop_open_desc, puffs_vnop_open }, /* open */ 237 { &vop_close_desc, puffs_vnop_close }, /* close */ 238 { &vop_access_desc, puffs_vnop_access }, /* access */ 239 { &vop_accessx_desc, genfs_accessx }, /* accessx */ 240 { &vop_getattr_desc, puffs_vnop_getattr }, /* getattr */ 241 { &vop_setattr_desc, puffs_vnop_setattr }, /* setattr */ 242 { &vop_read_desc, puffs_vnop_read }, /* read */ 243 { &vop_write_desc, puffs_vnop_write }, /* write */ 244 { &vop_seek_desc, puffs_vnop_seek }, /* seek */ 245 { &vop_remove_desc, puffs_vnop_remove }, /* remove */ 246 { &vop_link_desc, puffs_vnop_link }, /* link */ 247 { &vop_rename_desc, puffs_vnop_rename }, /* rename */ 248 { &vop_mkdir_desc, puffs_vnop_mkdir }, /* mkdir */ 249 { &vop_rmdir_desc, puffs_vnop_rmdir }, /* rmdir */ 250 { &vop_symlink_desc, puffs_vnop_symlink }, /* symlink */ 251 { &vop_readdir_desc, puffs_vnop_readdir }, /* readdir */ 252 { &vop_readlink_desc, puffs_vnop_readlink }, /* readlink */ 253 { &vop_print_desc, puffs_vnop_print }, /* print */ 254 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 255 { &vop_pathconf_desc, puffs_vnop_pathconf }, /* pathconf */ 256 { &vop_getpages_desc, puffs_vnop_getpages }, /* getpages */ 257 { NULL, NULL } 258 }; 259 const struct vnodeopv_desc puffs_msgop_opv_desc = 260 { &puffs_msgop_p, puffs_msgop_entries }; 261 262 /* 263 * for dosetattr / update_va 264 */ 265 #define SETATTR_CHSIZE 0x01 266 #define SETATTR_ASYNC 0x02 267 268 #define ERROUT(err) \ 269 do { \ 270 error = err; \ 271 goto out; \ 272 } while (/*CONSTCOND*/0) 273 274 /* 275 * This is a generic vnode operation handler. It checks if the necessary 276 * operations for the called vnode operation are implemented by userspace 277 * and either returns a dummy return value or proceeds to call the real 278 * vnode operation from puffs_msgop_v. 279 * 280 * XXX: this should described elsewhere and autogenerated, the complexity 281 * of the vnode operations vectors and their interrelationships is also 282 * getting a bit out of hand. Another problem is that we need this same 283 * information in the fs server code, so keeping the two in sync manually 284 * is not a viable (long term) plan. 285 */ 286 287 /* not supported, handle locking protocol */ 288 #define CHECKOP_NOTSUPP(op) \ 289 case VOP_##op##_DESCOFFSET: \ 290 if (pmp->pmp_vnopmask[PUFFS_VN_##op] == 0) \ 291 return genfs_eopnotsupp(v); \ 292 break 293 294 /* always succeed, no locking */ 295 #define CHECKOP_SUCCESS(op) \ 296 case VOP_##op##_DESCOFFSET: \ 297 if (pmp->pmp_vnopmask[PUFFS_VN_##op] == 0) \ 298 return 0; \ 299 break 300 301 int 302 puffs_vnop_checkop(void *v) 303 { 304 struct vop_generic_args /* { 305 struct vnodeop_desc *a_desc; 306 spooky mystery contents; 307 } */ *ap = v; 308 struct vnodeop_desc *desc = ap->a_desc; 309 struct puffs_mount *pmp; 310 struct vnode *vp; 311 int offset, rv; 312 313 offset = ap->a_desc->vdesc_vp_offsets[0]; 314 #ifdef DIAGNOSTIC 315 if (offset == VDESC_NO_OFFSET) 316 panic("puffs_checkop: no vnode, why did you call me?"); 317 #endif 318 vp = *VOPARG_OFFSETTO(struct vnode **, offset, ap); 319 pmp = MPTOPUFFSMP(vp->v_mount); 320 321 DPRINTF_VERBOSE(("checkop call %s (%d), vp %p\n", 322 ap->a_desc->vdesc_name, ap->a_desc->vdesc_offset, vp)); 323 324 if (!ALLOPS(pmp)) { 325 switch (desc->vdesc_offset) { 326 CHECKOP_NOTSUPP(CREATE); 327 CHECKOP_NOTSUPP(MKNOD); 328 CHECKOP_NOTSUPP(GETATTR); 329 CHECKOP_NOTSUPP(SETATTR); 330 CHECKOP_NOTSUPP(READ); 331 CHECKOP_NOTSUPP(WRITE); 332 CHECKOP_NOTSUPP(FCNTL); 333 CHECKOP_NOTSUPP(IOCTL); 334 CHECKOP_NOTSUPP(REMOVE); 335 CHECKOP_NOTSUPP(LINK); 336 CHECKOP_NOTSUPP(RENAME); 337 CHECKOP_NOTSUPP(MKDIR); 338 CHECKOP_NOTSUPP(RMDIR); 339 CHECKOP_NOTSUPP(SYMLINK); 340 CHECKOP_NOTSUPP(READDIR); 341 CHECKOP_NOTSUPP(READLINK); 342 CHECKOP_NOTSUPP(PRINT); 343 CHECKOP_NOTSUPP(PATHCONF); 344 CHECKOP_NOTSUPP(GETEXTATTR); 345 CHECKOP_NOTSUPP(SETEXTATTR); 346 CHECKOP_NOTSUPP(LISTEXTATTR); 347 CHECKOP_NOTSUPP(DELETEEXTATTR); 348 349 CHECKOP_SUCCESS(ACCESS); 350 CHECKOP_SUCCESS(CLOSE); 351 CHECKOP_SUCCESS(SEEK); 352 353 case VOP_GETPAGES_DESCOFFSET: 354 if (!EXISTSOP(pmp, READ)) 355 return genfs_eopnotsupp(v); 356 break; 357 358 default: 359 panic("puffs_checkop: unhandled vnop %d", 360 desc->vdesc_offset); 361 } 362 } 363 364 rv = VOCALL(puffs_msgop_p, ap->a_desc->vdesc_offset, v); 365 366 DPRINTF_VERBOSE(("checkop return %s (%d), vp %p: %d\n", 367 ap->a_desc->vdesc_name, ap->a_desc->vdesc_offset, vp, rv)); 368 369 return rv; 370 } 371 372 static int callremove(struct puffs_mount *, puffs_cookie_t, puffs_cookie_t, 373 struct componentname *); 374 static int callrmdir(struct puffs_mount *, puffs_cookie_t, puffs_cookie_t, 375 struct componentname *); 376 static void callinactive(struct puffs_mount *, puffs_cookie_t, int); 377 static void callreclaim(struct puffs_mount *, puffs_cookie_t, int); 378 static int flushvncache(struct vnode *, off_t, off_t, bool); 379 static void update_va(struct vnode *, struct vattr *, struct vattr *, 380 struct timespec *, struct timespec *, int); 381 static void update_parent(struct vnode *, struct vnode *); 382 383 384 #define PUFFS_ABORT_LOOKUP 1 385 #define PUFFS_ABORT_CREATE 2 386 #define PUFFS_ABORT_MKNOD 3 387 #define PUFFS_ABORT_MKDIR 4 388 #define PUFFS_ABORT_SYMLINK 5 389 390 /* 391 * Press the pani^Wabort button! Kernel resource allocation failed. 392 */ 393 static void 394 puffs_abortbutton(struct puffs_mount *pmp, int what, 395 puffs_cookie_t dck, puffs_cookie_t ck, struct componentname *cnp) 396 { 397 398 switch (what) { 399 case PUFFS_ABORT_CREATE: 400 case PUFFS_ABORT_MKNOD: 401 case PUFFS_ABORT_SYMLINK: 402 callremove(pmp, dck, ck, cnp); 403 break; 404 case PUFFS_ABORT_MKDIR: 405 callrmdir(pmp, dck, ck, cnp); 406 break; 407 } 408 409 callinactive(pmp, ck, 0); 410 callreclaim(pmp, ck, 1); 411 } 412 413 /* 414 * Begin vnode operations. 415 * 416 * A word from the keymaster about locks: generally we don't want 417 * to use the vnode locks at all: it creates an ugly dependency between 418 * the userlandia file server and the kernel. But we'll play along with 419 * the kernel vnode locks for now. However, even currently we attempt 420 * to release locks as early as possible. This is possible for some 421 * operations which a) don't need a locked vnode after the userspace op 422 * and b) return with the vnode unlocked. Theoretically we could 423 * unlock-do op-lock for others and order the graph in userspace, but I 424 * don't want to think of the consequences for the time being. 425 */ 426 427 #define TTL_TO_TIMEOUT(ts) \ 428 (getticks() + (ts->tv_sec * hz) + (ts->tv_nsec * hz / 1000000000)) 429 #define TTL_VALID(ts) \ 430 ((ts != NULL) && !((ts->tv_sec == 0) && (ts->tv_nsec == 0))) 431 #define TIMED_OUT(expire) \ 432 ((int)((unsigned int)getticks() - (unsigned int)expire) > 0) 433 int 434 puffs_vnop_lookup(void *v) 435 { 436 struct vop_lookup_v2_args /* { 437 const struct vnodeop_desc *a_desc; 438 struct vnode *a_dvp; 439 struct vnode **a_vpp; 440 struct componentname *a_cnp; 441 } */ *ap = v; 442 PUFFS_MSG_VARS(vn, lookup); 443 struct puffs_mount *pmp; 444 struct componentname *cnp; 445 struct vnode *vp, *dvp, *cvp; 446 struct puffs_node *dpn, *cpn; 447 int isdot; 448 int error; 449 450 pmp = MPTOPUFFSMP(ap->a_dvp->v_mount); 451 cnp = ap->a_cnp; 452 dvp = ap->a_dvp; 453 cvp = NULL; 454 cpn = NULL; 455 *ap->a_vpp = NULL; 456 457 /* r/o fs? we check create later to handle EEXIST */ 458 if ((cnp->cn_flags & ISLASTCN) 459 && (dvp->v_mount->mnt_flag & MNT_RDONLY) 460 && (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 461 return EROFS; 462 463 isdot = cnp->cn_namelen == 1 && *cnp->cn_nameptr == '.'; 464 465 DPRINTF(("puffs_lookup: \"%s\", parent vnode %p, op: %x\n", 466 cnp->cn_nameptr, dvp, cnp->cn_nameiop)); 467 468 /* 469 * If dotdot cache is enabled, add reference to .. and return. 470 */ 471 if (PUFFS_USE_DOTDOTCACHE(pmp) && (cnp->cn_flags & ISDOTDOT)) { 472 vp = VPTOPP(ap->a_dvp)->pn_parent; 473 vref(vp); 474 475 *ap->a_vpp = vp; 476 return 0; 477 } 478 479 /* 480 * Check if someone fed it into the cache 481 */ 482 if (!isdot && PUFFS_USE_NAMECACHE(pmp)) { 483 int found, iswhiteout; 484 485 found = cache_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 486 cnp->cn_nameiop, cnp->cn_flags, 487 &iswhiteout, ap->a_vpp); 488 if (iswhiteout) { 489 cnp->cn_flags |= ISWHITEOUT; 490 } 491 492 if (found && *ap->a_vpp != NULLVP && PUFFS_USE_FS_TTL(pmp)) { 493 cvp = *ap->a_vpp; 494 cpn = VPTOPP(cvp); 495 496 if (TIMED_OUT(cpn->pn_cn_timeout)) { 497 cache_purge(cvp); 498 /* 499 * cached vnode (cvp) is still referenced 500 * so that we can reuse it upon a new 501 * successful lookup. 502 */ 503 *ap->a_vpp = NULL; 504 found = 0; 505 } 506 } 507 508 /* 509 * Do not use negative caching, since the filesystem 510 * provides no TTL for it. 511 */ 512 if (found && *ap->a_vpp == NULLVP && PUFFS_USE_FS_TTL(pmp)) 513 found = 0; 514 515 if (found) { 516 return *ap->a_vpp == NULLVP ? ENOENT : 0; 517 } 518 519 /* 520 * This is what would have been left in ERROR before 521 * the rearrangement of cache_lookup(). What with all 522 * the macros, I am not sure if this is a dead value 523 * below or not. 524 */ 525 error = -1; 526 } 527 528 if (isdot) { 529 /* deal with rename lookup semantics */ 530 if (cnp->cn_nameiop == RENAME && (cnp->cn_flags & ISLASTCN)) 531 return EISDIR; 532 533 vp = ap->a_dvp; 534 vref(vp); 535 *ap->a_vpp = vp; 536 return 0; 537 } 538 539 if (cvp != NULL) { 540 if (vn_lock(cvp, LK_EXCLUSIVE) != 0) { 541 vrele(cvp); 542 cvp = NULL; 543 } else 544 mutex_enter(&cpn->pn_sizemtx); 545 } 546 547 PUFFS_MSG_ALLOC(vn, lookup); 548 puffs_makecn(&lookup_msg->pvnr_cn, &lookup_msg->pvnr_cn_cred, 549 cnp, PUFFS_USE_FULLPNBUF(pmp)); 550 551 if (cnp->cn_flags & ISDOTDOT) 552 VOP_UNLOCK(dvp); 553 554 puffs_msg_setinfo(park_lookup, PUFFSOP_VN, 555 PUFFS_VN_LOOKUP, VPTOPNC(dvp)); 556 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_lookup, dvp->v_data, NULL, error); 557 DPRINTF(("puffs_lookup: return of the userspace, part %d\n", error)); 558 559 /* 560 * In case of error, there is no new vnode to play with, so be 561 * happy with the NULL value given to vpp in the beginning. 562 * Also, check if this really was an error or the target was not 563 * present. Either treat it as a non-error for CREATE/RENAME or 564 * enter the component into the negative name cache (if desired). 565 */ 566 if (error) { 567 error = checkerr(pmp, error, __func__); 568 if (error == ENOENT) { 569 /* don't allow to create files on r/o fs */ 570 if ((dvp->v_mount->mnt_flag & MNT_RDONLY) 571 && cnp->cn_nameiop == CREATE) { 572 error = EROFS; 573 574 /* adjust values if we are creating */ 575 } else if ((cnp->cn_flags & ISLASTCN) 576 && (cnp->cn_nameiop == CREATE 577 || cnp->cn_nameiop == RENAME)) { 578 error = EJUSTRETURN; 579 580 /* save negative cache entry */ 581 } else { 582 if (PUFFS_USE_NAMECACHE(pmp) && 583 !PUFFS_USE_FS_TTL(pmp)) 584 cache_enter(dvp, NULL, cnp->cn_nameptr, 585 cnp->cn_namelen, cnp->cn_flags); 586 } 587 } 588 goto out; 589 } 590 591 /* 592 * Check that we don't get our parent node back, that would cause 593 * a pretty obvious deadlock. 594 */ 595 dpn = dvp->v_data; 596 if (lookup_msg->pvnr_newnode == dpn->pn_cookie) { 597 puffs_senderr(pmp, PUFFS_ERR_LOOKUP, EINVAL, 598 "lookup produced parent cookie", lookup_msg->pvnr_newnode); 599 error = EPROTO; 600 goto out; 601 } 602 603 /* 604 * Check if we looked up the cached vnode 605 */ 606 vp = NULL; 607 if (cvp && (VPTOPP(cvp)->pn_cookie == lookup_msg->pvnr_newnode)) { 608 int grace; 609 610 /* 611 * Bump grace time of this node so that it does not get 612 * reclaimed too fast. We try to increase a bit more the 613 * lifetime of busiest * nodes - with some limits. 614 */ 615 grace = 10 * puffs_sopreq_expire_timeout; 616 cpn->pn_cn_grace = getticks() + grace; 617 vp = cvp; 618 } 619 620 /* 621 * No cached vnode available, or the cached vnode does not 622 * match the userland cookie anymore: is the node known? 623 */ 624 if (vp == NULL) { 625 error = puffs_getvnode(dvp->v_mount, 626 lookup_msg->pvnr_newnode, lookup_msg->pvnr_vtype, 627 lookup_msg->pvnr_size, lookup_msg->pvnr_rdev, &vp); 628 if (error) { 629 puffs_abortbutton(pmp, PUFFS_ABORT_LOOKUP, 630 VPTOPNC(dvp), lookup_msg->pvnr_newnode, 631 ap->a_cnp); 632 goto out; 633 } 634 635 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 636 } 637 638 /* 639 * Update cache and TTL 640 */ 641 if (PUFFS_USE_FS_TTL(pmp)) { 642 struct timespec *va_ttl = &lookup_msg->pvnr_va_ttl; 643 struct timespec *cn_ttl = &lookup_msg->pvnr_cn_ttl; 644 update_va(vp, NULL, &lookup_msg->pvnr_va, 645 va_ttl, cn_ttl, SETATTR_CHSIZE); 646 } 647 648 KASSERT(lookup_msg->pvnr_newnode == VPTOPP(vp)->pn_cookie); 649 *ap->a_vpp = vp; 650 651 if (PUFFS_USE_NAMECACHE(pmp)) 652 cache_enter(dvp, vp, cnp->cn_nameptr, cnp->cn_namelen, 653 cnp->cn_flags); 654 655 /* XXX */ 656 if ((lookup_msg->pvnr_cn.pkcn_flags & REQUIREDIR) == 0) 657 cnp->cn_flags &= ~REQUIREDIR; 658 if (lookup_msg->pvnr_cn.pkcn_consume) { 659 printf("puffs: warning: ignoring cn_consume of %zu chars\n", 660 lookup_msg->pvnr_cn.pkcn_consume); 661 } 662 663 VPTOPP(vp)->pn_nlookup++; 664 665 if (PUFFS_USE_DOTDOTCACHE(pmp) && 666 (VPTOPP(vp)->pn_parent != dvp)) 667 update_parent(vp, dvp); 668 669 out: 670 if (cvp != NULL) { 671 mutex_exit(&cpn->pn_sizemtx); 672 673 if (error || (cvp != vp)) 674 vput(cvp); 675 } 676 if (error == 0) 677 VOP_UNLOCK(*ap->a_vpp); 678 679 if (cnp->cn_flags & ISDOTDOT) 680 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 681 682 DPRINTF(("puffs_lookup: returning %d %p\n", error, *ap->a_vpp)); 683 PUFFS_MSG_RELEASE(lookup); 684 return error; 685 } 686 687 #define REFPN_AND_UNLOCKVP(a, b) \ 688 do { \ 689 mutex_enter(&b->pn_mtx); \ 690 puffs_referencenode(b); \ 691 mutex_exit(&b->pn_mtx); \ 692 VOP_UNLOCK(a); \ 693 } while (/*CONSTCOND*/0) 694 695 #define REFPN(b) \ 696 do { \ 697 mutex_enter(&b->pn_mtx); \ 698 puffs_referencenode(b); \ 699 mutex_exit(&b->pn_mtx); \ 700 } while (/*CONSTCOND*/0) 701 702 #define RELEPN_AND_VP(a, b) \ 703 do { \ 704 puffs_releasenode(b); \ 705 vrele(a); \ 706 } while (/*CONSTCOND*/0) 707 708 int 709 puffs_vnop_create(void *v) 710 { 711 struct vop_create_v3_args /* { 712 const struct vnodeop_desc *a_desc; 713 struct vnode *a_dvp; 714 struct vnode **a_vpp; 715 struct componentname *a_cnp; 716 struct vattr *a_vap; 717 } */ *ap = v; 718 PUFFS_MSG_VARS(vn, create); 719 struct vnode *dvp = ap->a_dvp; 720 struct puffs_node *dpn = VPTOPP(dvp); 721 struct componentname *cnp = ap->a_cnp; 722 struct mount *mp = dvp->v_mount; 723 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 724 int error; 725 726 DPRINTF(("puffs_create: dvp %p, cnp: %s\n", 727 dvp, ap->a_cnp->cn_nameptr)); 728 729 PUFFS_MSG_ALLOC(vn, create); 730 puffs_makecn(&create_msg->pvnr_cn, &create_msg->pvnr_cn_cred, 731 cnp, PUFFS_USE_FULLPNBUF(pmp)); 732 create_msg->pvnr_va = *ap->a_vap; 733 puffs_msg_setinfo(park_create, PUFFSOP_VN, 734 PUFFS_VN_CREATE, VPTOPNC(dvp)); 735 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_create, dvp->v_data, NULL, error); 736 737 error = checkerr(pmp, error, __func__); 738 if (error) 739 goto out; 740 741 error = puffs_newnode(mp, dvp, ap->a_vpp, 742 create_msg->pvnr_newnode, cnp, ap->a_vap->va_type, 0); 743 if (error) { 744 puffs_abortbutton(pmp, PUFFS_ABORT_CREATE, dpn->pn_cookie, 745 create_msg->pvnr_newnode, cnp); 746 goto out; 747 } 748 749 if (PUFFS_USE_FS_TTL(pmp)) { 750 struct timespec *va_ttl = &create_msg->pvnr_va_ttl; 751 struct timespec *cn_ttl = &create_msg->pvnr_cn_ttl; 752 struct vattr *rvap = &create_msg->pvnr_va; 753 754 update_va(*ap->a_vpp, NULL, rvap, 755 va_ttl, cn_ttl, SETATTR_CHSIZE); 756 } 757 758 VPTOPP(*ap->a_vpp)->pn_nlookup++; 759 760 if (PUFFS_USE_DOTDOTCACHE(pmp) && 761 (VPTOPP(*ap->a_vpp)->pn_parent != dvp)) 762 update_parent(*ap->a_vpp, dvp); 763 764 out: 765 DPRINTF(("puffs_create: return %d\n", error)); 766 PUFFS_MSG_RELEASE(create); 767 return error; 768 } 769 770 int 771 puffs_vnop_mknod(void *v) 772 { 773 struct vop_mknod_v3_args /* { 774 const struct vnodeop_desc *a_desc; 775 struct vnode *a_dvp; 776 struct vnode **a_vpp; 777 struct componentname *a_cnp; 778 struct vattr *a_vap; 779 } */ *ap = v; 780 PUFFS_MSG_VARS(vn, mknod); 781 struct vnode *dvp = ap->a_dvp; 782 struct puffs_node *dpn = VPTOPP(dvp); 783 struct componentname *cnp = ap->a_cnp; 784 struct mount *mp = dvp->v_mount; 785 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 786 int error; 787 788 PUFFS_MSG_ALLOC(vn, mknod); 789 puffs_makecn(&mknod_msg->pvnr_cn, &mknod_msg->pvnr_cn_cred, 790 cnp, PUFFS_USE_FULLPNBUF(pmp)); 791 mknod_msg->pvnr_va = *ap->a_vap; 792 puffs_msg_setinfo(park_mknod, PUFFSOP_VN, 793 PUFFS_VN_MKNOD, VPTOPNC(dvp)); 794 795 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_mknod, dvp->v_data, NULL, error); 796 797 error = checkerr(pmp, error, __func__); 798 if (error) 799 goto out; 800 801 error = puffs_newnode(mp, dvp, ap->a_vpp, 802 mknod_msg->pvnr_newnode, cnp, ap->a_vap->va_type, 803 ap->a_vap->va_rdev); 804 if (error) { 805 puffs_abortbutton(pmp, PUFFS_ABORT_MKNOD, dpn->pn_cookie, 806 mknod_msg->pvnr_newnode, cnp); 807 goto out; 808 } 809 810 if (PUFFS_USE_FS_TTL(pmp)) { 811 struct timespec *va_ttl = &mknod_msg->pvnr_va_ttl; 812 struct timespec *cn_ttl = &mknod_msg->pvnr_cn_ttl; 813 struct vattr *rvap = &mknod_msg->pvnr_va; 814 815 update_va(*ap->a_vpp, NULL, rvap, 816 va_ttl, cn_ttl, SETATTR_CHSIZE); 817 } 818 819 VPTOPP(*ap->a_vpp)->pn_nlookup++; 820 821 if (PUFFS_USE_DOTDOTCACHE(pmp) && 822 (VPTOPP(*ap->a_vpp)->pn_parent != dvp)) 823 update_parent(*ap->a_vpp, dvp); 824 825 out: 826 PUFFS_MSG_RELEASE(mknod); 827 return error; 828 } 829 830 int 831 puffs_vnop_open(void *v) 832 { 833 struct vop_open_args /* { 834 const struct vnodeop_desc *a_desc; 835 struct vnode *a_vp; 836 int a_mode; 837 kauth_cred_t a_cred; 838 } */ *ap = v; 839 PUFFS_MSG_VARS(vn, open); 840 struct vnode *vp = ap->a_vp; 841 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 842 struct puffs_node *pn = VPTOPP(vp); 843 int mode = ap->a_mode; 844 int error; 845 846 DPRINTF(("puffs_open: vp %p, mode 0x%x\n", vp, mode)); 847 848 if (vp->v_type == VREG && mode & FWRITE && !EXISTSOP(pmp, WRITE)) 849 ERROUT(EROFS); 850 851 if (!EXISTSOP(pmp, OPEN)) 852 ERROUT(0); 853 854 PUFFS_MSG_ALLOC(vn, open); 855 open_msg->pvnr_mode = mode; 856 puffs_credcvt(&open_msg->pvnr_cred, ap->a_cred); 857 puffs_msg_setinfo(park_open, PUFFSOP_VN, 858 PUFFS_VN_OPEN, VPTOPNC(vp)); 859 860 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_open, vp->v_data, NULL, error); 861 error = checkerr(pmp, error, __func__); 862 863 if (open_msg->pvnr_oflags & PUFFS_OPEN_IO_DIRECT) { 864 /* 865 * Flush cache: 866 * - we do not want to discard cached write by direct write 867 * - read cache is now useless and should be freed 868 */ 869 mutex_enter(&pn->pn_sizemtx); 870 flushvncache(vp, 0, 0, true); 871 mutex_exit(&pn->pn_sizemtx); 872 873 if (mode & FREAD) 874 pn->pn_stat |= PNODE_RDIRECT; 875 if (mode & FWRITE) 876 pn->pn_stat |= PNODE_WDIRECT; 877 } 878 out: 879 DPRINTF(("puffs_open: returning %d\n", error)); 880 PUFFS_MSG_RELEASE(open); 881 return error; 882 } 883 884 int 885 puffs_vnop_close(void *v) 886 { 887 struct vop_close_args /* { 888 const struct vnodeop_desc *a_desc; 889 struct vnode *a_vp; 890 int a_fflag; 891 kauth_cred_t a_cred; 892 } */ *ap = v; 893 PUFFS_MSG_VARS(vn, close); 894 struct vnode *vp = ap->a_vp; 895 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 896 897 PUFFS_MSG_ALLOC(vn, close); 898 puffs_msg_setfaf(park_close); 899 close_msg->pvnr_fflag = ap->a_fflag; 900 puffs_credcvt(&close_msg->pvnr_cred, ap->a_cred); 901 puffs_msg_setinfo(park_close, PUFFSOP_VN, 902 PUFFS_VN_CLOSE, VPTOPNC(vp)); 903 904 puffs_msg_enqueue(pmp, park_close); 905 PUFFS_MSG_RELEASE(close); 906 return 0; 907 } 908 909 int 910 puffs_vnop_access(void *v) 911 { 912 struct vop_access_args /* { 913 const struct vnodeop_desc *a_desc; 914 struct vnode *a_vp; 915 accmode_t a_accmode; 916 kauth_cred_t a_cred; 917 } */ *ap = v; 918 PUFFS_MSG_VARS(vn, access); 919 struct vnode *vp = ap->a_vp; 920 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 921 accmode_t accmode = ap->a_accmode; 922 int error; 923 924 if (accmode & VWRITE) { 925 switch (vp->v_type) { 926 case VDIR: 927 case VLNK: 928 case VREG: 929 if ((vp->v_mount->mnt_flag & MNT_RDONLY) 930 || !EXISTSOP(pmp, WRITE)) 931 return EROFS; 932 break; 933 default: 934 break; 935 } 936 } 937 938 if (!EXISTSOP(pmp, ACCESS)) 939 return 0; 940 941 PUFFS_MSG_ALLOC(vn, access); 942 access_msg->pvnr_mode = ap->a_accmode; 943 puffs_credcvt(&access_msg->pvnr_cred, ap->a_cred); 944 puffs_msg_setinfo(park_access, PUFFSOP_VN, 945 PUFFS_VN_ACCESS, VPTOPNC(vp)); 946 947 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_access, vp->v_data, NULL, error); 948 error = checkerr(pmp, error, __func__); 949 PUFFS_MSG_RELEASE(access); 950 951 return error; 952 } 953 954 static void 955 update_va(struct vnode *vp, struct vattr *vap, struct vattr *rvap, 956 struct timespec *va_ttl, struct timespec *cn_ttl, int flags) 957 { 958 struct puffs_node *pn = VPTOPP(vp); 959 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 960 int use_metacache; 961 962 if (TTL_VALID(cn_ttl)) { 963 pn->pn_cn_timeout = TTL_TO_TIMEOUT(cn_ttl); 964 pn->pn_cn_grace = MAX(pn->pn_cn_timeout, pn->pn_cn_grace); 965 } 966 967 /* 968 * Don't listen to the file server regarding special device 969 * size info, the file server doesn't know anything about them. 970 */ 971 if (vp->v_type == VBLK || vp->v_type == VCHR) 972 rvap->va_size = vp->v_size; 973 974 /* Ditto for blocksize (ufs comment: this doesn't belong here) */ 975 if (vp->v_type == VBLK) 976 rvap->va_blocksize = BLKDEV_IOSIZE; 977 else if (vp->v_type == VCHR) 978 rvap->va_blocksize = MAXBSIZE; 979 980 if (vap != NULL) { 981 (void) memcpy(vap, rvap, sizeof(struct vattr)); 982 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 983 984 if (PUFFS_USE_METAFLUSH(pmp)) { 985 if (pn->pn_stat & PNODE_METACACHE_ATIME) 986 vap->va_atime = pn->pn_mc_atime; 987 if (pn->pn_stat & PNODE_METACACHE_CTIME) 988 vap->va_ctime = pn->pn_mc_ctime; 989 if (pn->pn_stat & PNODE_METACACHE_MTIME) 990 vap->va_mtime = pn->pn_mc_mtime; 991 if (pn->pn_stat & PNODE_METACACHE_SIZE) 992 vap->va_size = pn->pn_mc_size; 993 } 994 } 995 996 use_metacache = PUFFS_USE_METAFLUSH(pmp) && 997 (pn->pn_stat & PNODE_METACACHE_SIZE); 998 if (!use_metacache && (flags & SETATTR_CHSIZE)) { 999 if (rvap->va_size != VNOVAL 1000 && vp->v_type != VBLK && vp->v_type != VCHR) { 1001 uvm_vnp_setsize(vp, rvap->va_size); 1002 pn->pn_serversize = rvap->va_size; 1003 } 1004 } 1005 1006 if ((va_ttl != NULL) && TTL_VALID(va_ttl)) { 1007 if (pn->pn_va_cache == NULL) 1008 pn->pn_va_cache = pool_get(&puffs_vapool, PR_WAITOK); 1009 1010 (void)memcpy(pn->pn_va_cache, rvap, sizeof(*rvap)); 1011 1012 pn->pn_va_timeout = TTL_TO_TIMEOUT(va_ttl); 1013 } 1014 } 1015 1016 static void 1017 update_parent(struct vnode *vp, struct vnode *dvp) 1018 { 1019 struct puffs_node *pn = VPTOPP(vp); 1020 1021 if (pn->pn_parent != NULL) { 1022 KASSERT(pn->pn_parent != dvp); 1023 vrele(pn->pn_parent); 1024 } 1025 1026 vref(dvp); 1027 pn->pn_parent = dvp; 1028 } 1029 1030 int 1031 puffs_vnop_getattr(void *v) 1032 { 1033 struct vop_getattr_args /* { 1034 const struct vnodeop_desc *a_desc; 1035 struct vnode *a_vp; 1036 struct vattr *a_vap; 1037 kauth_cred_t a_cred; 1038 } */ *ap = v; 1039 PUFFS_MSG_VARS(vn, getattr); 1040 struct vnode *vp = ap->a_vp; 1041 struct mount *mp = vp->v_mount; 1042 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 1043 struct vattr *vap, *rvap; 1044 struct puffs_node *pn = VPTOPP(vp); 1045 struct timespec *va_ttl = NULL; 1046 int error = 0; 1047 1048 /* 1049 * A lock is required so that we do not race with 1050 * setattr, write and fsync when changing vp->v_size. 1051 * This is critical, since setting a stall smaller value 1052 * triggers a file truncate in uvm_vnp_setsize(), which 1053 * most of the time means data corruption (a chunk of 1054 * data is replaced by zeroes). This can be removed if 1055 * we decide one day that VOP_GETATTR must operate on 1056 * a locked vnode. 1057 * 1058 * XXX Should be useless now that VOP_GETATTR has been 1059 * fixed to always require a shared lock at least. 1060 */ 1061 mutex_enter(&pn->pn_sizemtx); 1062 1063 REFPN(pn); 1064 vap = ap->a_vap; 1065 1066 if (PUFFS_USE_FS_TTL(pmp)) { 1067 if (!TIMED_OUT(pn->pn_va_timeout)) { 1068 update_va(vp, vap, pn->pn_va_cache, 1069 NULL, NULL, SETATTR_CHSIZE); 1070 goto out2; 1071 } 1072 } 1073 1074 PUFFS_MSG_ALLOC(vn, getattr); 1075 vattr_null(&getattr_msg->pvnr_va); 1076 puffs_credcvt(&getattr_msg->pvnr_cred, ap->a_cred); 1077 puffs_msg_setinfo(park_getattr, PUFFSOP_VN, 1078 PUFFS_VN_GETATTR, VPTOPNC(vp)); 1079 1080 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_getattr, vp->v_data, NULL, error); 1081 error = checkerr(pmp, error, __func__); 1082 if (error) 1083 goto out; 1084 1085 rvap = &getattr_msg->pvnr_va; 1086 1087 if (PUFFS_USE_FS_TTL(pmp)) 1088 va_ttl = &getattr_msg->pvnr_va_ttl; 1089 1090 update_va(vp, vap, rvap, va_ttl, NULL, SETATTR_CHSIZE); 1091 1092 out: 1093 PUFFS_MSG_RELEASE(getattr); 1094 1095 out2: 1096 puffs_releasenode(pn); 1097 1098 mutex_exit(&pn->pn_sizemtx); 1099 1100 return error; 1101 } 1102 1103 static void 1104 zerofill_lastpage(struct vnode *vp, voff_t off) 1105 { 1106 1107 if (trunc_page(off) == off) 1108 return; 1109 1110 if (vp->v_writecount == 0) 1111 return; 1112 1113 vsize_t len = round_page(off) - off; 1114 ubc_zerorange(&vp->v_uobj, off, len, UBC_WRITE|UBC_VNODE_FLAGS(vp)); 1115 } 1116 1117 static int 1118 dosetattr(struct vnode *vp, struct vattr *vap, kauth_cred_t cred, int flags) 1119 { 1120 PUFFS_MSG_VARS(vn, setattr); 1121 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1122 struct puffs_node *pn = vp->v_data; 1123 vsize_t oldsize = vp->v_size; 1124 int error = 0; 1125 1126 KASSERT(!(flags & SETATTR_CHSIZE) || mutex_owned(&pn->pn_sizemtx)); 1127 1128 if ((vp->v_mount->mnt_flag & MNT_RDONLY) && 1129 (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL 1130 || vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL 1131 || vap->va_mode != (mode_t)VNOVAL)) 1132 return EROFS; 1133 1134 if ((vp->v_mount->mnt_flag & MNT_RDONLY) 1135 && vp->v_type == VREG && vap->va_size != VNOVAL) 1136 return EROFS; 1137 1138 /* 1139 * Flush metacache first. If we are called with some explicit 1140 * parameters, treat them as information overriding metacache 1141 * information. 1142 */ 1143 if (PUFFS_USE_METAFLUSH(pmp) && pn->pn_stat & PNODE_METACACHE_MASK) { 1144 if ((pn->pn_stat & PNODE_METACACHE_ATIME) 1145 && vap->va_atime.tv_sec == VNOVAL) 1146 vap->va_atime = pn->pn_mc_atime; 1147 if ((pn->pn_stat & PNODE_METACACHE_CTIME) 1148 && vap->va_ctime.tv_sec == VNOVAL) 1149 vap->va_ctime = pn->pn_mc_ctime; 1150 if ((pn->pn_stat & PNODE_METACACHE_MTIME) 1151 && vap->va_mtime.tv_sec == VNOVAL) 1152 vap->va_mtime = pn->pn_mc_mtime; 1153 if ((pn->pn_stat & PNODE_METACACHE_SIZE) 1154 && vap->va_size == VNOVAL) 1155 vap->va_size = pn->pn_mc_size; 1156 1157 pn->pn_stat &= ~PNODE_METACACHE_MASK; 1158 } 1159 1160 /* 1161 * Flush attribute cache so that another thread do 1162 * not get a stale value during the operation. 1163 */ 1164 if (PUFFS_USE_FS_TTL(pmp)) 1165 pn->pn_va_timeout = 0; 1166 1167 PUFFS_MSG_ALLOC(vn, setattr); 1168 (void)memcpy(&setattr_msg->pvnr_va, vap, sizeof(struct vattr)); 1169 puffs_credcvt(&setattr_msg->pvnr_cred, cred); 1170 puffs_msg_setinfo(park_setattr, PUFFSOP_VN, 1171 PUFFS_VN_SETATTR, VPTOPNC(vp)); 1172 if (flags & SETATTR_ASYNC) 1173 puffs_msg_setfaf(park_setattr); 1174 1175 puffs_msg_enqueue(pmp, park_setattr); 1176 if ((flags & SETATTR_ASYNC) == 0) { 1177 error = puffs_msg_wait2(pmp, park_setattr, vp->v_data, NULL); 1178 1179 if ((error == 0) && PUFFS_USE_FS_TTL(pmp)) { 1180 struct timespec *va_ttl = &setattr_msg->pvnr_va_ttl; 1181 struct vattr *rvap = &setattr_msg->pvnr_va; 1182 1183 update_va(vp, NULL, rvap, va_ttl, NULL, flags); 1184 } 1185 } 1186 1187 PUFFS_MSG_RELEASE(setattr); 1188 if ((flags & SETATTR_ASYNC) == 0) { 1189 error = checkerr(pmp, error, __func__); 1190 if (error) 1191 return error; 1192 } else { 1193 error = 0; 1194 } 1195 1196 if (vap->va_size != VNOVAL) { 1197 /* 1198 * If we truncated the file, make sure the data beyond 1199 * EOF in last page does not remain in cache, otherwise 1200 * if the file is later truncated to a larger size (creating 1201 * a hole), that area will not return zeroes as it 1202 * should. 1203 */ 1204 if ((flags & SETATTR_CHSIZE) && PUFFS_USE_PAGECACHE(pmp) && 1205 (vap->va_size < oldsize)) 1206 zerofill_lastpage(vp, vap->va_size); 1207 1208 pn->pn_serversize = vap->va_size; 1209 if (flags & SETATTR_CHSIZE) 1210 uvm_vnp_setsize(vp, vap->va_size); 1211 puffs_updatenode(pn, PUFFS_UPDATECTIME | PUFFS_UPDATEMTIME, 0); 1212 } 1213 1214 return 0; 1215 } 1216 1217 int 1218 puffs_vnop_setattr(void *v) 1219 { 1220 struct vop_getattr_args /* { 1221 const struct vnodeop_desc *a_desc; 1222 struct vnode *a_vp; 1223 struct vattr *a_vap; 1224 kauth_cred_t a_cred; 1225 } */ *ap = v; 1226 struct puffs_node *pn = ap->a_vp->v_data; 1227 int error; 1228 1229 mutex_enter(&pn->pn_sizemtx); 1230 error = dosetattr(ap->a_vp, ap->a_vap, ap->a_cred, SETATTR_CHSIZE); 1231 mutex_exit(&pn->pn_sizemtx); 1232 1233 return error; 1234 } 1235 1236 static __inline int 1237 doinact(struct puffs_mount *pmp, int iaflag) 1238 { 1239 1240 if (EXISTSOP(pmp, INACTIVE)) 1241 if (pmp->pmp_flags & PUFFS_KFLAG_IAONDEMAND) 1242 if (iaflag || ALLOPS(pmp)) 1243 return 1; 1244 else 1245 return 0; 1246 else 1247 return 1; 1248 else 1249 return 0; 1250 } 1251 1252 static void 1253 callinactive(struct puffs_mount *pmp, puffs_cookie_t ck, int iaflag) 1254 { 1255 PUFFS_MSG_VARS(vn, inactive); 1256 1257 if (doinact(pmp, iaflag)) { 1258 PUFFS_MSG_ALLOC(vn, inactive); 1259 puffs_msg_setinfo(park_inactive, PUFFSOP_VN, 1260 PUFFS_VN_INACTIVE, ck); 1261 PUFFS_MSG_ENQUEUEWAIT_NOERROR(pmp, park_inactive); 1262 PUFFS_MSG_RELEASE(inactive); 1263 } 1264 } 1265 1266 /* XXX: callinactive can't setback */ 1267 int 1268 puffs_vnop_inactive(void *v) 1269 { 1270 struct vop_inactive_v2_args /* { 1271 const struct vnodeop_desc *a_desc; 1272 struct vnode *a_vp; 1273 } */ *ap = v; 1274 PUFFS_MSG_VARS(vn, inactive); 1275 struct vnode *vp = ap->a_vp; 1276 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1277 struct puffs_node *pnode; 1278 bool recycle = false; 1279 1280 /* 1281 * When puffs_cookie2vnode() misses an entry, vcache_get() 1282 * creates a new node (puffs_vfsop_loadvnode being called to 1283 * initialize the PUFFS part), then it discovers it is VNON, 1284 * and tries to vrele() it. This leads us there, while the 1285 * cookie was stall and the node likely already reclaimed. 1286 */ 1287 if (vp->v_type == VNON) { 1288 return 0; 1289 } 1290 1291 pnode = vp->v_data; 1292 mutex_enter(&pnode->pn_sizemtx); 1293 1294 if (doinact(pmp, pnode->pn_stat & PNODE_DOINACT)) { 1295 flushvncache(vp, 0, 0, false); 1296 PUFFS_MSG_ALLOC(vn, inactive); 1297 puffs_msg_setinfo(park_inactive, PUFFSOP_VN, 1298 PUFFS_VN_INACTIVE, VPTOPNC(vp)); 1299 PUFFS_MSG_ENQUEUEWAIT2_NOERROR(pmp, park_inactive, vp->v_data, 1300 NULL); 1301 PUFFS_MSG_RELEASE(inactive); 1302 } 1303 pnode->pn_stat &= ~PNODE_DOINACT; 1304 1305 /* 1306 * file server thinks it's gone? then don't be afraid care, 1307 * node's life was already all it would ever be 1308 */ 1309 if (pnode->pn_stat & PNODE_NOREFS) { 1310 pnode->pn_stat |= PNODE_DYING; 1311 recycle = true; 1312 } 1313 1314 /* 1315 * Handle node TTL. 1316 * If grace has already timed out, make it reclaimed. 1317 * Otherwise, we queue its expiration by sop thread, so 1318 * that it does not remain for ages in the freelist, 1319 * holding memory in userspace, while we will have 1320 * to look it up again anyway. 1321 */ 1322 if (PUFFS_USE_FS_TTL(pmp) && !(vp->v_vflag & VV_ROOT) && !recycle) { 1323 bool incache = !TIMED_OUT(pnode->pn_cn_timeout); 1324 bool ingrace = !TIMED_OUT(pnode->pn_cn_grace); 1325 bool reclaimqueued = pnode->pn_stat & PNODE_SOPEXP; 1326 1327 if (!incache && !ingrace && !reclaimqueued) { 1328 pnode->pn_stat |= PNODE_DYING; 1329 recycle = true; 1330 } 1331 1332 if (!recycle && !reclaimqueued) { 1333 struct puffs_sopreq *psopr; 1334 int at = MAX(pnode->pn_cn_grace, pnode->pn_cn_timeout); 1335 1336 KASSERT(curlwp != uvm.pagedaemon_lwp); 1337 psopr = kmem_alloc(sizeof(*psopr), KM_SLEEP); 1338 psopr->psopr_ck = VPTOPNC(pnode->pn_vp); 1339 psopr->psopr_sopreq = PUFFS_SOPREQ_EXPIRE; 1340 psopr->psopr_at = at; 1341 1342 mutex_enter(&pmp->pmp_sopmtx); 1343 1344 /* 1345 * If thread has disapeared, just give up. The 1346 * fs is being unmounted and the node will be 1347 * be reclaimed anyway. 1348 * 1349 * Otherwise, we queue the request but do not 1350 * immediatly signal the thread, as the node 1351 * has not been expired yet. 1352 */ 1353 if (pmp->pmp_sopthrcount == 0) { 1354 kmem_free(psopr, sizeof(*psopr)); 1355 } else { 1356 TAILQ_INSERT_TAIL(&pmp->pmp_sopnodereqs, 1357 psopr, psopr_entries); 1358 pnode->pn_stat |= PNODE_SOPEXP; 1359 } 1360 1361 mutex_exit(&pmp->pmp_sopmtx); 1362 } 1363 } 1364 1365 /* 1366 * Wipe direct I/O flags 1367 */ 1368 pnode->pn_stat &= ~(PNODE_RDIRECT|PNODE_WDIRECT); 1369 1370 *ap->a_recycle = recycle; 1371 1372 mutex_exit(&pnode->pn_sizemtx); 1373 1374 return 0; 1375 } 1376 1377 static void 1378 callreclaim(struct puffs_mount *pmp, puffs_cookie_t ck, int nlookup) 1379 { 1380 PUFFS_MSG_VARS(vn, reclaim); 1381 1382 if (!EXISTSOP(pmp, RECLAIM)) 1383 return; 1384 1385 PUFFS_MSG_ALLOC(vn, reclaim); 1386 reclaim_msg->pvnr_nlookup = nlookup; 1387 puffs_msg_setfaf(park_reclaim); 1388 puffs_msg_setinfo(park_reclaim, PUFFSOP_VN, PUFFS_VN_RECLAIM, ck); 1389 1390 puffs_msg_enqueue(pmp, park_reclaim); 1391 PUFFS_MSG_RELEASE(reclaim); 1392 return; 1393 } 1394 1395 /* 1396 * always FAF, we don't really care if the server wants to fail to 1397 * reclaim the node or not 1398 */ 1399 int 1400 puffs_vnop_reclaim(void *v) 1401 { 1402 struct vop_reclaim_v2_args /* { 1403 const struct vnodeop_desc *a_desc; 1404 struct vnode *a_vp; 1405 } */ *ap = v; 1406 struct vnode *vp = ap->a_vp; 1407 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1408 bool notifyserver = true; 1409 1410 VOP_UNLOCK(vp); 1411 1412 /* 1413 * first things first: check if someone is trying to reclaim the 1414 * root vnode. do not allow that to travel to userspace. 1415 * Note that we don't need to take the lock similarly to 1416 * puffs_root(), since there is only one of us. 1417 */ 1418 if (vp->v_vflag & VV_ROOT) { 1419 mutex_enter(&pmp->pmp_lock); 1420 KASSERT(pmp->pmp_root != NULL); 1421 pmp->pmp_root = NULL; 1422 mutex_exit(&pmp->pmp_lock); 1423 notifyserver = false; 1424 } 1425 1426 /* See the comment on top of puffs_vnop_inactive(). */ 1427 if (vp->v_type == VNON) 1428 notifyserver = false; 1429 1430 /* 1431 * purge info from kernel before issueing FAF, since we 1432 * don't really know when we'll get around to it after 1433 * that and someone might race us into node creation 1434 */ 1435 mutex_enter(&pmp->pmp_lock); 1436 if (PUFFS_USE_NAMECACHE(pmp)) 1437 cache_purge(vp); 1438 mutex_exit(&pmp->pmp_lock); 1439 1440 if (notifyserver) { 1441 int nlookup = VPTOPP(vp)->pn_nlookup; 1442 1443 callreclaim(MPTOPUFFSMP(vp->v_mount), VPTOPNC(vp), nlookup); 1444 } 1445 1446 if (PUFFS_USE_DOTDOTCACHE(pmp)) { 1447 if (__predict_true(VPTOPP(vp)->pn_parent != NULL)) 1448 vrele(VPTOPP(vp)->pn_parent); 1449 else 1450 KASSERT(vp->v_type == VNON || (vp->v_vflag & VV_ROOT)); 1451 } 1452 1453 puffs_putvnode(vp); 1454 1455 return 0; 1456 } 1457 1458 #define CSIZE sizeof(**ap->a_cookies) 1459 int 1460 puffs_vnop_readdir(void *v) 1461 { 1462 struct vop_readdir_args /* { 1463 const struct vnodeop_desc *a_desc; 1464 struct vnode *a_vp; 1465 struct uio *a_uio; 1466 kauth_cred_t a_cred; 1467 int *a_eofflag; 1468 off_t **a_cookies; 1469 int *a_ncookies; 1470 } */ *ap = v; 1471 PUFFS_MSG_VARS(vn, readdir); 1472 struct vnode *vp = ap->a_vp; 1473 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1474 size_t argsize, tomove, cookiemem, cookiesmax; 1475 struct uio *uio = ap->a_uio; 1476 size_t howmuch, resid; 1477 int error; 1478 1479 /* 1480 * ok, so we need: resid + cookiemem = maxreq 1481 * => resid + cookiesize * (resid/minsize) = maxreq 1482 * => resid + cookiesize/minsize * resid = maxreq 1483 * => (cookiesize/minsize + 1) * resid = maxreq 1484 * => resid = maxreq / (cookiesize/minsize + 1) 1485 * 1486 * Since cookiesize <= minsize and we're not very big on floats, 1487 * we approximate that to be 1. Therefore: 1488 * 1489 * resid = maxreq / 2; 1490 * 1491 * Well, at least we didn't have to use differential equations 1492 * or the Gram-Schmidt process. 1493 * 1494 * (yes, I'm very afraid of this) 1495 */ 1496 KASSERT(CSIZE <= _DIRENT_MINSIZE((struct dirent *)0)); 1497 1498 if (ap->a_cookies) { 1499 KASSERT(ap->a_ncookies != NULL); 1500 if (pmp->pmp_args.pa_fhsize == 0) 1501 return EOPNOTSUPP; 1502 resid = PUFFS_TOMOVE(uio->uio_resid, pmp) / 2; 1503 cookiesmax = resid/_DIRENT_MINSIZE((struct dirent *)0); 1504 cookiemem = ALIGN(cookiesmax*CSIZE); /* play safe */ 1505 } else { 1506 resid = PUFFS_TOMOVE(uio->uio_resid, pmp); 1507 cookiesmax = 0; 1508 cookiemem = 0; 1509 } 1510 1511 argsize = sizeof(struct puffs_vnmsg_readdir); 1512 tomove = resid + cookiemem; 1513 puffs_msgmem_alloc(argsize + tomove, &park_readdir, 1514 (void *)&readdir_msg, 1); 1515 1516 puffs_credcvt(&readdir_msg->pvnr_cred, ap->a_cred); 1517 readdir_msg->pvnr_offset = uio->uio_offset; 1518 readdir_msg->pvnr_resid = resid; 1519 readdir_msg->pvnr_ncookies = cookiesmax; 1520 readdir_msg->pvnr_eofflag = 0; 1521 readdir_msg->pvnr_dentoff = cookiemem; 1522 puffs_msg_setinfo(park_readdir, PUFFSOP_VN, 1523 PUFFS_VN_READDIR, VPTOPNC(vp)); 1524 puffs_msg_setdelta(park_readdir, tomove); 1525 1526 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_readdir, vp->v_data, NULL, error); 1527 error = checkerr(pmp, error, __func__); 1528 if (error) 1529 goto out; 1530 1531 /* userspace is cheating? */ 1532 if (readdir_msg->pvnr_resid > resid) { 1533 puffs_senderr(pmp, PUFFS_ERR_READDIR, E2BIG, 1534 "resid grew", VPTOPNC(vp)); 1535 ERROUT(EPROTO); 1536 } 1537 if (readdir_msg->pvnr_ncookies > cookiesmax) { 1538 puffs_senderr(pmp, PUFFS_ERR_READDIR, E2BIG, 1539 "too many cookies", VPTOPNC(vp)); 1540 ERROUT(EPROTO); 1541 } 1542 1543 /* check eof */ 1544 if (readdir_msg->pvnr_eofflag) 1545 *ap->a_eofflag = 1; 1546 1547 /* bouncy-wouncy with the directory data */ 1548 howmuch = resid - readdir_msg->pvnr_resid; 1549 1550 /* force eof if no data was returned (getcwd() needs this) */ 1551 if (howmuch == 0) { 1552 *ap->a_eofflag = 1; 1553 goto out; 1554 } 1555 1556 error = uiomove(readdir_msg->pvnr_data + cookiemem, howmuch, uio); 1557 if (error) 1558 goto out; 1559 1560 /* provide cookies to caller if so desired */ 1561 if (ap->a_cookies) { 1562 KASSERT(curlwp != uvm.pagedaemon_lwp); 1563 *ap->a_cookies = malloc(readdir_msg->pvnr_ncookies*CSIZE, 1564 M_TEMP, M_WAITOK); 1565 *ap->a_ncookies = readdir_msg->pvnr_ncookies; 1566 memcpy(*ap->a_cookies, readdir_msg->pvnr_data, 1567 *ap->a_ncookies*CSIZE); 1568 } 1569 1570 /* next readdir starts here */ 1571 uio->uio_offset = readdir_msg->pvnr_offset; 1572 1573 out: 1574 puffs_msgmem_release(park_readdir); 1575 return error; 1576 } 1577 #undef CSIZE 1578 1579 /* 1580 * poll works by consuming the bitmask in pn_revents. If there are 1581 * events available, poll returns immediately. If not, it issues a 1582 * poll to userspace, selrecords itself and returns with no available 1583 * events. When the file server returns, it executes puffs_parkdone_poll(), 1584 * where available events are added to the bitmask. selnotify() is 1585 * then also executed by that function causing us to enter here again 1586 * and hopefully find the missing bits (unless someone got them first, 1587 * in which case it starts all over again). 1588 */ 1589 int 1590 puffs_vnop_poll(void *v) 1591 { 1592 struct vop_poll_args /* { 1593 const struct vnodeop_desc *a_desc; 1594 struct vnode *a_vp; 1595 int a_events; 1596 } */ *ap = v; 1597 PUFFS_MSG_VARS(vn, poll); 1598 struct vnode *vp = ap->a_vp; 1599 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1600 struct puffs_node *pn = vp->v_data; 1601 int events; 1602 1603 if (EXISTSOP(pmp, POLL)) { 1604 mutex_enter(&pn->pn_mtx); 1605 events = pn->pn_revents & ap->a_events; 1606 if (events & ap->a_events) { 1607 pn->pn_revents &= ~ap->a_events; 1608 mutex_exit(&pn->pn_mtx); 1609 1610 return events; 1611 } else { 1612 puffs_referencenode(pn); 1613 mutex_exit(&pn->pn_mtx); 1614 1615 PUFFS_MSG_ALLOC(vn, poll); 1616 poll_msg->pvnr_events = ap->a_events; 1617 puffs_msg_setinfo(park_poll, PUFFSOP_VN, 1618 PUFFS_VN_POLL, VPTOPNC(vp)); 1619 puffs_msg_setcall(park_poll, puffs_parkdone_poll, pn); 1620 selrecord(curlwp, &pn->pn_sel); 1621 1622 PUFFS_MSG_ENQUEUEWAIT2_NOERROR(pmp, park_poll, 1623 vp->v_data, NULL); 1624 PUFFS_MSG_RELEASE(poll); 1625 1626 return 0; 1627 } 1628 } else { 1629 return genfs_poll(v); 1630 } 1631 } 1632 1633 static int 1634 flushvncache(struct vnode *vp, off_t offlo, off_t offhi, bool wait) 1635 { 1636 struct puffs_node *pn = VPTOPP(vp); 1637 struct vattr va; 1638 int pflags, error; 1639 1640 /* flush out information from our metacache, see vop_setattr */ 1641 if (pn->pn_stat & PNODE_METACACHE_MASK 1642 && (pn->pn_stat & PNODE_DYING) == 0) { 1643 vattr_null(&va); 1644 error = dosetattr(vp, &va, FSCRED, 1645 SETATTR_CHSIZE | (wait ? 0 : SETATTR_ASYNC)); 1646 if (error) 1647 return error; 1648 } 1649 1650 /* 1651 * flush pages to avoid being overly dirty 1652 */ 1653 pflags = PGO_CLEANIT; 1654 if (wait) 1655 pflags |= PGO_SYNCIO; 1656 1657 rw_enter(vp->v_uobj.vmobjlock, RW_WRITER); 1658 return VOP_PUTPAGES(vp, trunc_page(offlo), round_page(offhi), pflags); 1659 } 1660 1661 int 1662 puffs_vnop_fsync(void *v) 1663 { 1664 struct vop_fsync_args /* { 1665 const struct vnodeop_desc *a_desc; 1666 struct vnode *a_vp; 1667 kauth_cred_t a_cred; 1668 int a_flags; 1669 off_t a_offlo; 1670 off_t a_offhi; 1671 } */ *ap = v; 1672 PUFFS_MSG_VARS(vn, fsync); 1673 struct vnode *vp; 1674 struct puffs_node *pn; 1675 struct puffs_mount *pmp; 1676 int error, dofaf; 1677 1678 vp = ap->a_vp; 1679 KASSERT(vp != NULL); 1680 pn = VPTOPP(vp); 1681 KASSERT(pn != NULL); 1682 pmp = MPTOPUFFSMP(vp->v_mount); 1683 1684 /* See the comment on top of puffs_vnop_inactive(). */ 1685 if (vp->v_type == VNON) 1686 return 0; 1687 1688 if (ap->a_flags & FSYNC_WAIT) { 1689 mutex_enter(&pn->pn_sizemtx); 1690 } else { 1691 if (mutex_tryenter(&pn->pn_sizemtx) == 0) 1692 return EDEADLK; 1693 } 1694 1695 error = flushvncache(vp, ap->a_offlo, ap->a_offhi, 1696 (ap->a_flags & FSYNC_WAIT) == FSYNC_WAIT); 1697 if (error) 1698 goto out; 1699 1700 /* 1701 * HELLO! We exit already here if the user server does not 1702 * support fsync OR if we should call fsync for a node which 1703 * has references neither in the kernel or the fs server. 1704 * Otherwise we continue to issue fsync() forward. 1705 */ 1706 error = 0; 1707 if (!EXISTSOP(pmp, FSYNC) || (pn->pn_stat & PNODE_DYING)) 1708 goto out; 1709 1710 dofaf = (ap->a_flags & FSYNC_WAIT) == 0 || ap->a_flags == FSYNC_LAZY; 1711 /* 1712 * We abuse VXLOCK to mean "vnode is going to die", so we issue 1713 * only FAFs for those. Otherwise there's a danger of deadlock, 1714 * since the execution context here might be the user server 1715 * doing some operation on another fs, which in turn caused a 1716 * vnode to be reclaimed from the freelist for this fs. 1717 */ 1718 if (dofaf == 0) { 1719 mutex_enter(vp->v_interlock); 1720 if (vdead_check(vp, VDEAD_NOWAIT) != 0) 1721 dofaf = 1; 1722 mutex_exit(vp->v_interlock); 1723 } 1724 1725 PUFFS_MSG_ALLOC(vn, fsync); 1726 if (dofaf) 1727 puffs_msg_setfaf(park_fsync); 1728 1729 puffs_credcvt(&fsync_msg->pvnr_cred, ap->a_cred); 1730 fsync_msg->pvnr_flags = ap->a_flags; 1731 fsync_msg->pvnr_offlo = ap->a_offlo; 1732 fsync_msg->pvnr_offhi = ap->a_offhi; 1733 puffs_msg_setinfo(park_fsync, PUFFSOP_VN, 1734 PUFFS_VN_FSYNC, VPTOPNC(vp)); 1735 1736 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_fsync, vp->v_data, NULL, error); 1737 PUFFS_MSG_RELEASE(fsync); 1738 1739 error = checkerr(pmp, error, __func__); 1740 1741 out: 1742 mutex_exit(&pn->pn_sizemtx); 1743 return error; 1744 } 1745 1746 int 1747 puffs_vnop_seek(void *v) 1748 { 1749 struct vop_seek_args /* { 1750 const struct vnodeop_desc *a_desc; 1751 struct vnode *a_vp; 1752 off_t a_oldoff; 1753 off_t a_newoff; 1754 kauth_cred_t a_cred; 1755 } */ *ap = v; 1756 PUFFS_MSG_VARS(vn, seek); 1757 struct vnode *vp = ap->a_vp; 1758 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1759 int error; 1760 1761 PUFFS_MSG_ALLOC(vn, seek); 1762 seek_msg->pvnr_oldoff = ap->a_oldoff; 1763 seek_msg->pvnr_newoff = ap->a_newoff; 1764 puffs_credcvt(&seek_msg->pvnr_cred, ap->a_cred); 1765 puffs_msg_setinfo(park_seek, PUFFSOP_VN, 1766 PUFFS_VN_SEEK, VPTOPNC(vp)); 1767 1768 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_seek, vp->v_data, NULL, error); 1769 PUFFS_MSG_RELEASE(seek); 1770 return checkerr(pmp, error, __func__); 1771 } 1772 1773 static int 1774 callremove(struct puffs_mount *pmp, puffs_cookie_t dck, puffs_cookie_t ck, 1775 struct componentname *cnp) 1776 { 1777 PUFFS_MSG_VARS(vn, remove); 1778 int error; 1779 1780 PUFFS_MSG_ALLOC(vn, remove); 1781 remove_msg->pvnr_cookie_targ = ck; 1782 puffs_makecn(&remove_msg->pvnr_cn, &remove_msg->pvnr_cn_cred, 1783 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1784 puffs_msg_setinfo(park_remove, PUFFSOP_VN, PUFFS_VN_REMOVE, dck); 1785 1786 PUFFS_MSG_ENQUEUEWAIT(pmp, park_remove, error); 1787 PUFFS_MSG_RELEASE(remove); 1788 1789 return checkerr(pmp, error, __func__); 1790 } 1791 1792 /* 1793 * XXX: can't use callremove now because can't catch setbacks with 1794 * it due to lack of a pnode argument. 1795 */ 1796 int 1797 puffs_vnop_remove(void *v) 1798 { 1799 struct vop_remove_v2_args /* { 1800 const struct vnodeop_desc *a_desc; 1801 struct vnode *a_dvp; 1802 struct vnode *a_vp; 1803 struct componentname *a_cnp; 1804 } */ *ap = v; 1805 PUFFS_MSG_VARS(vn, remove); 1806 struct vnode *dvp = ap->a_dvp; 1807 struct vnode *vp = ap->a_vp; 1808 struct puffs_node *dpn = VPTOPP(dvp); 1809 struct puffs_node *pn = VPTOPP(vp); 1810 struct componentname *cnp = ap->a_cnp; 1811 struct mount *mp = dvp->v_mount; 1812 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 1813 int error; 1814 1815 PUFFS_MSG_ALLOC(vn, remove); 1816 remove_msg->pvnr_cookie_targ = VPTOPNC(vp); 1817 puffs_makecn(&remove_msg->pvnr_cn, &remove_msg->pvnr_cn_cred, 1818 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1819 puffs_msg_setinfo(park_remove, PUFFSOP_VN, 1820 PUFFS_VN_REMOVE, VPTOPNC(dvp)); 1821 1822 puffs_msg_enqueue(pmp, park_remove); 1823 vref(dvp); /* hang onto caller's reference at end */ 1824 REFPN(dpn); 1825 if (dvp == vp) 1826 REFPN(pn); 1827 else 1828 REFPN_AND_UNLOCKVP(vp, pn); 1829 error = puffs_msg_wait2(pmp, park_remove, dpn, pn); 1830 1831 PUFFS_MSG_RELEASE(remove); 1832 1833 puffs_updatenode(VPTOPP(dvp), PUFFS_UPDATECTIME|PUFFS_UPDATEMTIME, 0); 1834 1835 RELEPN_AND_VP(dvp, dpn); 1836 RELEPN_AND_VP(vp, pn); 1837 1838 error = checkerr(pmp, error, __func__); 1839 return error; 1840 } 1841 1842 int 1843 puffs_vnop_mkdir(void *v) 1844 { 1845 struct vop_mkdir_v3_args /* { 1846 const struct vnodeop_desc *a_desc; 1847 struct vnode *a_dvp; 1848 struct vnode **a_vpp; 1849 struct componentname *a_cnp; 1850 struct vattr *a_vap; 1851 } */ *ap = v; 1852 PUFFS_MSG_VARS(vn, mkdir); 1853 struct vnode *dvp = ap->a_dvp; 1854 struct puffs_node *dpn = VPTOPP(dvp); 1855 struct componentname *cnp = ap->a_cnp; 1856 struct mount *mp = dvp->v_mount; 1857 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 1858 int error; 1859 1860 PUFFS_MSG_ALLOC(vn, mkdir); 1861 puffs_makecn(&mkdir_msg->pvnr_cn, &mkdir_msg->pvnr_cn_cred, 1862 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1863 mkdir_msg->pvnr_va = *ap->a_vap; 1864 puffs_msg_setinfo(park_mkdir, PUFFSOP_VN, 1865 PUFFS_VN_MKDIR, VPTOPNC(dvp)); 1866 1867 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_mkdir, dvp->v_data, NULL, error); 1868 1869 error = checkerr(pmp, error, __func__); 1870 if (error) 1871 goto out; 1872 1873 error = puffs_newnode(mp, dvp, ap->a_vpp, 1874 mkdir_msg->pvnr_newnode, cnp, VDIR, 0); 1875 if (error) { 1876 puffs_abortbutton(pmp, PUFFS_ABORT_MKDIR, dpn->pn_cookie, 1877 mkdir_msg->pvnr_newnode, cnp); 1878 goto out; 1879 } 1880 1881 if (PUFFS_USE_FS_TTL(pmp)) { 1882 struct timespec *va_ttl = &mkdir_msg->pvnr_va_ttl; 1883 struct timespec *cn_ttl = &mkdir_msg->pvnr_cn_ttl; 1884 struct vattr *rvap = &mkdir_msg->pvnr_va; 1885 1886 update_va(*ap->a_vpp, NULL, rvap, 1887 va_ttl, cn_ttl, SETATTR_CHSIZE); 1888 } 1889 1890 VPTOPP(*ap->a_vpp)->pn_nlookup++; 1891 1892 if (PUFFS_USE_DOTDOTCACHE(pmp) && 1893 (VPTOPP(*ap->a_vpp)->pn_parent != dvp)) 1894 update_parent(*ap->a_vpp, dvp); 1895 1896 out: 1897 PUFFS_MSG_RELEASE(mkdir); 1898 return error; 1899 } 1900 1901 static int 1902 callrmdir(struct puffs_mount *pmp, puffs_cookie_t dck, puffs_cookie_t ck, 1903 struct componentname *cnp) 1904 { 1905 PUFFS_MSG_VARS(vn, rmdir); 1906 int error; 1907 1908 PUFFS_MSG_ALLOC(vn, rmdir); 1909 rmdir_msg->pvnr_cookie_targ = ck; 1910 puffs_makecn(&rmdir_msg->pvnr_cn, &rmdir_msg->pvnr_cn_cred, 1911 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1912 puffs_msg_setinfo(park_rmdir, PUFFSOP_VN, PUFFS_VN_RMDIR, dck); 1913 1914 PUFFS_MSG_ENQUEUEWAIT(pmp, park_rmdir, error); 1915 PUFFS_MSG_RELEASE(rmdir); 1916 1917 return checkerr(pmp, error, __func__); 1918 } 1919 1920 int 1921 puffs_vnop_rmdir(void *v) 1922 { 1923 struct vop_rmdir_v2_args /* { 1924 const struct vnodeop_desc *a_desc; 1925 struct vnode *a_dvp; 1926 struct vnode *a_vp; 1927 struct componentname *a_cnp; 1928 } */ *ap = v; 1929 PUFFS_MSG_VARS(vn, rmdir); 1930 struct vnode *dvp = ap->a_dvp; 1931 struct vnode *vp = ap->a_vp; 1932 struct puffs_node *dpn = VPTOPP(dvp); 1933 struct puffs_node *pn = VPTOPP(vp); 1934 struct puffs_mount *pmp = MPTOPUFFSMP(dvp->v_mount); 1935 struct componentname *cnp = ap->a_cnp; 1936 int error; 1937 1938 PUFFS_MSG_ALLOC(vn, rmdir); 1939 rmdir_msg->pvnr_cookie_targ = VPTOPNC(vp); 1940 puffs_makecn(&rmdir_msg->pvnr_cn, &rmdir_msg->pvnr_cn_cred, 1941 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1942 puffs_msg_setinfo(park_rmdir, PUFFSOP_VN, 1943 PUFFS_VN_RMDIR, VPTOPNC(dvp)); 1944 1945 puffs_msg_enqueue(pmp, park_rmdir); 1946 vref(dvp); /* hang onto caller's reference at end */ 1947 KASSERTMSG((dvp != vp), "rmdir ."); 1948 REFPN(dpn); 1949 REFPN_AND_UNLOCKVP(vp, pn); 1950 error = puffs_msg_wait2(pmp, park_rmdir, dpn, pn); 1951 1952 PUFFS_MSG_RELEASE(rmdir); 1953 1954 puffs_updatenode(VPTOPP(dvp), PUFFS_UPDATECTIME|PUFFS_UPDATEMTIME, 0); 1955 1956 /* XXX: some call cache_purge() *for both vnodes* here, investigate */ 1957 RELEPN_AND_VP(dvp, dpn); 1958 RELEPN_AND_VP(vp, pn); 1959 1960 return error; 1961 } 1962 1963 int 1964 puffs_vnop_link(void *v) 1965 { 1966 struct vop_link_v2_args /* { 1967 const struct vnodeop_desc *a_desc; 1968 struct vnode *a_dvp; 1969 struct vnode *a_vp; 1970 struct componentname *a_cnp; 1971 } */ *ap = v; 1972 PUFFS_MSG_VARS(vn, link); 1973 struct vnode *dvp = ap->a_dvp; 1974 struct vnode *vp = ap->a_vp; 1975 struct puffs_node *dpn = VPTOPP(dvp); 1976 struct puffs_node *pn = VPTOPP(vp); 1977 struct puffs_mount *pmp = MPTOPUFFSMP(dvp->v_mount); 1978 struct componentname *cnp = ap->a_cnp; 1979 int error; 1980 1981 PUFFS_MSG_ALLOC(vn, link); 1982 link_msg->pvnr_cookie_targ = VPTOPNC(vp); 1983 puffs_makecn(&link_msg->pvnr_cn, &link_msg->pvnr_cn_cred, 1984 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1985 puffs_msg_setinfo(park_link, PUFFSOP_VN, 1986 PUFFS_VN_LINK, VPTOPNC(dvp)); 1987 1988 puffs_msg_enqueue(pmp, park_link); 1989 error = puffs_msg_wait2(pmp, park_link, dpn, pn); 1990 1991 PUFFS_MSG_RELEASE(link); 1992 1993 error = checkerr(pmp, error, __func__); 1994 1995 /* 1996 * XXX: stay in touch with the cache. I don't like this, but 1997 * don't have a better solution either. See also puffs_rename(). 1998 */ 1999 if (error == 0) { 2000 puffs_updatenode(pn, PUFFS_UPDATECTIME, 0); 2001 puffs_updatenode(VPTOPP(dvp), 2002 PUFFS_UPDATECTIME|PUFFS_UPDATEMTIME, 0); 2003 } 2004 2005 return error; 2006 } 2007 2008 int 2009 puffs_vnop_symlink(void *v) 2010 { 2011 struct vop_symlink_v3_args /* { 2012 const struct vnodeop_desc *a_desc; 2013 struct vnode *a_dvp; 2014 struct vnode **a_vpp; 2015 struct componentname *a_cnp; 2016 struct vattr *a_vap; 2017 char *a_target; 2018 } */ *ap = v; 2019 PUFFS_MSG_VARS(vn, symlink); 2020 struct vnode *dvp = ap->a_dvp; 2021 struct puffs_node *dpn = VPTOPP(dvp); 2022 struct mount *mp = dvp->v_mount; 2023 struct puffs_mount *pmp = MPTOPUFFSMP(dvp->v_mount); 2024 struct componentname *cnp = ap->a_cnp; 2025 int error; 2026 2027 *ap->a_vpp = NULL; 2028 2029 PUFFS_MSG_ALLOC(vn, symlink); 2030 puffs_makecn(&symlink_msg->pvnr_cn, &symlink_msg->pvnr_cn_cred, 2031 cnp, PUFFS_USE_FULLPNBUF(pmp)); 2032 symlink_msg->pvnr_va = *ap->a_vap; 2033 (void)strlcpy(symlink_msg->pvnr_link, ap->a_target, 2034 sizeof(symlink_msg->pvnr_link)); 2035 puffs_msg_setinfo(park_symlink, PUFFSOP_VN, 2036 PUFFS_VN_SYMLINK, VPTOPNC(dvp)); 2037 2038 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_symlink, dvp->v_data, NULL, error); 2039 2040 error = checkerr(pmp, error, __func__); 2041 if (error) 2042 goto out; 2043 2044 error = puffs_newnode(mp, dvp, ap->a_vpp, 2045 symlink_msg->pvnr_newnode, cnp, VLNK, 0); 2046 if (error) { 2047 puffs_abortbutton(pmp, PUFFS_ABORT_SYMLINK, dpn->pn_cookie, 2048 symlink_msg->pvnr_newnode, cnp); 2049 goto out; 2050 } 2051 2052 if (PUFFS_USE_FS_TTL(pmp)) { 2053 struct timespec *va_ttl = &symlink_msg->pvnr_va_ttl; 2054 struct timespec *cn_ttl = &symlink_msg->pvnr_cn_ttl; 2055 struct vattr *rvap = &symlink_msg->pvnr_va; 2056 2057 update_va(*ap->a_vpp, NULL, rvap, 2058 va_ttl, cn_ttl, SETATTR_CHSIZE); 2059 } 2060 2061 VPTOPP(*ap->a_vpp)->pn_nlookup++; 2062 2063 if (PUFFS_USE_DOTDOTCACHE(pmp) && 2064 (VPTOPP(*ap->a_vpp)->pn_parent != dvp)) 2065 update_parent(*ap->a_vpp, dvp); 2066 2067 out: 2068 PUFFS_MSG_RELEASE(symlink); 2069 2070 return error; 2071 } 2072 2073 int 2074 puffs_vnop_readlink(void *v) 2075 { 2076 struct vop_readlink_args /* { 2077 const struct vnodeop_desc *a_desc; 2078 struct vnode *a_vp; 2079 struct uio *a_uio; 2080 kauth_cred_t a_cred; 2081 } */ *ap = v; 2082 PUFFS_MSG_VARS(vn, readlink); 2083 struct vnode *vp = ap->a_vp; 2084 struct puffs_mount *pmp = MPTOPUFFSMP(ap->a_vp->v_mount); 2085 size_t linklen; 2086 int error; 2087 2088 PUFFS_MSG_ALLOC(vn, readlink); 2089 puffs_credcvt(&readlink_msg->pvnr_cred, ap->a_cred); 2090 linklen = sizeof(readlink_msg->pvnr_link); 2091 readlink_msg->pvnr_linklen = linklen; 2092 puffs_msg_setinfo(park_readlink, PUFFSOP_VN, 2093 PUFFS_VN_READLINK, VPTOPNC(vp)); 2094 2095 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_readlink, vp->v_data, NULL, error); 2096 error = checkerr(pmp, error, __func__); 2097 if (error) 2098 goto out; 2099 2100 /* bad bad user file server */ 2101 if (readlink_msg->pvnr_linklen > linklen) { 2102 puffs_senderr(pmp, PUFFS_ERR_READLINK, E2BIG, 2103 "linklen too big", VPTOPNC(ap->a_vp)); 2104 error = EPROTO; 2105 goto out; 2106 } 2107 2108 error = uiomove(&readlink_msg->pvnr_link, readlink_msg->pvnr_linklen, 2109 ap->a_uio); 2110 out: 2111 PUFFS_MSG_RELEASE(readlink); 2112 return error; 2113 } 2114 2115 int 2116 puffs_vnop_rename(void *v) 2117 { 2118 struct vop_rename_args /* { 2119 const struct vnodeop_desc *a_desc; 2120 struct vnode *a_fdvp; 2121 struct vnode *a_fvp; 2122 struct componentname *a_fcnp; 2123 struct vnode *a_tdvp; 2124 struct vnode *a_tvp; 2125 struct componentname *a_tcnp; 2126 } */ *ap = v; 2127 PUFFS_MSG_VARS(vn, rename); 2128 struct vnode *fdvp = ap->a_fdvp, *fvp = ap->a_fvp; 2129 struct vnode *tdvp = ap->a_tdvp, *tvp = ap->a_tvp; 2130 struct puffs_node *fpn = ap->a_fvp->v_data; 2131 struct puffs_mount *pmp = MPTOPUFFSMP(fdvp->v_mount); 2132 int error; 2133 bool doabort = true; 2134 2135 if ((fvp->v_mount != tdvp->v_mount) || 2136 (tvp && (fvp->v_mount != tvp->v_mount))) { 2137 ERROUT(EXDEV); 2138 } 2139 2140 PUFFS_MSG_ALLOC(vn, rename); 2141 rename_msg->pvnr_cookie_src = VPTOPNC(fvp); 2142 rename_msg->pvnr_cookie_targdir = VPTOPNC(tdvp); 2143 if (tvp) 2144 rename_msg->pvnr_cookie_targ = VPTOPNC(tvp); 2145 else 2146 rename_msg->pvnr_cookie_targ = NULL; 2147 puffs_makecn(&rename_msg->pvnr_cn_src, &rename_msg->pvnr_cn_src_cred, 2148 ap->a_fcnp, PUFFS_USE_FULLPNBUF(pmp)); 2149 puffs_makecn(&rename_msg->pvnr_cn_targ, &rename_msg->pvnr_cn_targ_cred, 2150 ap->a_tcnp, PUFFS_USE_FULLPNBUF(pmp)); 2151 puffs_msg_setinfo(park_rename, PUFFSOP_VN, 2152 PUFFS_VN_RENAME, VPTOPNC(fdvp)); 2153 2154 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_rename, fdvp->v_data, NULL, error); 2155 doabort = false; 2156 PUFFS_MSG_RELEASE(rename); 2157 error = checkerr(pmp, error, __func__); 2158 2159 /* 2160 * XXX: stay in touch with the cache. I don't like this, but 2161 * don't have a better solution either. See also puffs_link(). 2162 */ 2163 if (error == 0) { 2164 puffs_updatenode(fpn, PUFFS_UPDATECTIME, 0); 2165 puffs_updatenode(VPTOPP(fdvp), 2166 PUFFS_UPDATECTIME|PUFFS_UPDATEMTIME, 0); 2167 if (fdvp != tdvp) 2168 puffs_updatenode(VPTOPP(tdvp), 2169 PUFFS_UPDATECTIME|PUFFS_UPDATEMTIME, 2170 0); 2171 2172 if (PUFFS_USE_DOTDOTCACHE(pmp) && 2173 (VPTOPP(fvp)->pn_parent != tdvp)) 2174 update_parent(fvp, tdvp); 2175 } 2176 2177 2178 out: 2179 if (doabort) 2180 VOP_ABORTOP(tdvp, ap->a_tcnp); 2181 if (tvp != NULL) 2182 vput(tvp); 2183 if (tdvp == tvp) 2184 vrele(tdvp); 2185 else 2186 vput(tdvp); 2187 2188 if (doabort) 2189 VOP_ABORTOP(fdvp, ap->a_fcnp); 2190 vrele(fdvp); 2191 vrele(fvp); 2192 2193 return error; 2194 } 2195 2196 #define RWARGS(cont, iofl, move, offset, creds) \ 2197 (cont)->pvnr_ioflag = (iofl); \ 2198 (cont)->pvnr_resid = (move); \ 2199 (cont)->pvnr_offset = (offset); \ 2200 puffs_credcvt(&(cont)->pvnr_cred, creds) 2201 2202 int 2203 puffs_vnop_read(void *v) 2204 { 2205 struct vop_read_args /* { 2206 const struct vnodeop_desc *a_desc; 2207 struct vnode *a_vp; 2208 struct uio *a_uio; 2209 int a_ioflag; 2210 kauth_cred_t a_cred; 2211 } */ *ap = v; 2212 PUFFS_MSG_VARS(vn, read); 2213 struct vnode *vp = ap->a_vp; 2214 struct puffs_node *pn = VPTOPP(vp); 2215 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2216 struct uio *uio = ap->a_uio; 2217 size_t tomove, argsize; 2218 vsize_t bytelen; 2219 int error; 2220 2221 read_msg = NULL; 2222 error = 0; 2223 2224 /* std sanity */ 2225 if (uio->uio_resid == 0) 2226 return 0; 2227 if (uio->uio_offset < 0) 2228 return EFBIG; 2229 2230 /* 2231 * On the case of reading empty files and (vp->v_size != 0) below: 2232 * some filesystems (hint: FUSE and distributed filesystems) still 2233 * expect to get the READ in order to update atime. Reading through 2234 * the case filters empty files, therefore we prefer to bypass the 2235 * cache here. 2236 */ 2237 if (vp->v_type == VREG && 2238 PUFFS_USE_PAGECACHE(pmp) && 2239 !(pn->pn_stat & PNODE_RDIRECT) && 2240 (vp->v_size != 0)) { 2241 const int advice = IO_ADV_DECODE(ap->a_ioflag); 2242 2243 while (uio->uio_resid > 0) { 2244 if (vp->v_size <= uio->uio_offset) { 2245 break; 2246 } 2247 bytelen = MIN(uio->uio_resid, 2248 vp->v_size - uio->uio_offset); 2249 if (bytelen == 0) 2250 break; 2251 2252 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice, 2253 UBC_READ | UBC_PARTIALOK | UBC_VNODE_FLAGS(vp)); 2254 if (error) 2255 break; 2256 } 2257 2258 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 2259 puffs_updatenode(VPTOPP(vp), PUFFS_UPDATEATIME, 0); 2260 } else { 2261 /* 2262 * in case it's not a regular file or we're operating 2263 * uncached, do read in the old-fashioned style, 2264 * i.e. explicit read operations 2265 */ 2266 2267 tomove = PUFFS_TOMOVE(uio->uio_resid, pmp); 2268 argsize = sizeof(struct puffs_vnmsg_read); 2269 puffs_msgmem_alloc(argsize + tomove, &park_read, 2270 (void *)&read_msg, 1); 2271 2272 error = 0; 2273 while (uio->uio_resid > 0) { 2274 tomove = PUFFS_TOMOVE(uio->uio_resid, pmp); 2275 memset(read_msg, 0, argsize); /* XXX: touser KASSERT */ 2276 RWARGS(read_msg, ap->a_ioflag, tomove, 2277 uio->uio_offset, ap->a_cred); 2278 puffs_msg_setinfo(park_read, PUFFSOP_VN, 2279 PUFFS_VN_READ, VPTOPNC(vp)); 2280 puffs_msg_setdelta(park_read, tomove); 2281 2282 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_read, vp->v_data, 2283 NULL, error); 2284 error = checkerr(pmp, error, __func__); 2285 if (error) 2286 break; 2287 2288 if (read_msg->pvnr_resid > tomove) { 2289 puffs_senderr(pmp, PUFFS_ERR_READ, 2290 E2BIG, "resid grew", VPTOPNC(ap->a_vp)); 2291 error = EPROTO; 2292 break; 2293 } 2294 2295 error = uiomove(read_msg->pvnr_data, 2296 tomove - read_msg->pvnr_resid, uio); 2297 2298 /* 2299 * in case the file is out of juice, resid from 2300 * userspace is != 0. and the error-case is 2301 * quite obvious 2302 */ 2303 if (error || read_msg->pvnr_resid) 2304 break; 2305 } 2306 2307 puffs_msgmem_release(park_read); 2308 } 2309 2310 return error; 2311 } 2312 2313 /* 2314 * XXX: in case of a failure, this leaves uio in a bad state. 2315 * We could theoretically copy the uio and iovecs and "replay" 2316 * them the right amount after the userspace trip, but don't 2317 * bother for now. 2318 */ 2319 int 2320 puffs_vnop_write(void *v) 2321 { 2322 struct vop_write_args /* { 2323 const struct vnodeop_desc *a_desc; 2324 struct vnode *a_vp; 2325 struct uio *a_uio; 2326 int a_ioflag; 2327 kauth_cred_t a_cred; 2328 } */ *ap = v; 2329 PUFFS_MSG_VARS(vn, write); 2330 struct vnode *vp = ap->a_vp; 2331 struct puffs_node *pn = VPTOPP(vp); 2332 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2333 struct uio *uio = ap->a_uio; 2334 size_t tomove, argsize; 2335 off_t oldoff, newoff, origoff; 2336 vsize_t bytelen; 2337 int error, uflags; 2338 int ubcflags; 2339 2340 error = uflags = 0; 2341 write_msg = NULL; 2342 2343 /* std sanity */ 2344 if (uio->uio_resid == 0) 2345 return 0; 2346 if (uio->uio_offset < 0) 2347 return EFBIG; 2348 2349 mutex_enter(&pn->pn_sizemtx); 2350 2351 /* 2352 * userspace *should* be allowed to control this, 2353 * but with UBC it's a bit unclear how to handle it 2354 */ 2355 if (ap->a_ioflag & IO_APPEND) 2356 uio->uio_offset = vp->v_size; 2357 2358 origoff = uio->uio_offset; 2359 2360 if (vp->v_type == VREG && 2361 PUFFS_USE_PAGECACHE(pmp) && 2362 !(pn->pn_stat & PNODE_WDIRECT)) { 2363 ubcflags = UBC_WRITE | UBC_PARTIALOK | UBC_VNODE_FLAGS(vp); 2364 2365 while (uio->uio_resid > 0) { 2366 oldoff = uio->uio_offset; 2367 bytelen = uio->uio_resid; 2368 2369 newoff = oldoff + bytelen; 2370 if (vp->v_size < newoff) { 2371 uvm_vnp_setwritesize(vp, newoff); 2372 } 2373 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, 2374 UVM_ADV_RANDOM, ubcflags); 2375 2376 /* 2377 * In case of a ubc_uiomove() error, 2378 * opt to not extend the file at all and 2379 * return an error. Otherwise, if we attempt 2380 * to clear the memory we couldn't fault to, 2381 * we might generate a kernel page fault. 2382 */ 2383 if (vp->v_size < newoff) { 2384 if (error == 0) { 2385 uflags |= PUFFS_UPDATESIZE; 2386 uvm_vnp_setsize(vp, newoff); 2387 } else { 2388 uvm_vnp_setwritesize(vp, vp->v_size); 2389 } 2390 } 2391 if (error) 2392 break; 2393 2394 /* 2395 * If we're writing large files, flush to file server 2396 * every 64k. Otherwise we can very easily exhaust 2397 * kernel and user memory, as the file server cannot 2398 * really keep up with our writing speed. 2399 * 2400 * Note: this does *NOT* honor MNT_ASYNC, because 2401 * that gives userland too much say in the kernel. 2402 */ 2403 if (oldoff >> 16 != uio->uio_offset >> 16) { 2404 rw_enter(vp->v_uobj.vmobjlock, RW_WRITER); 2405 error = VOP_PUTPAGES(vp, oldoff & ~0xffff, 2406 uio->uio_offset & ~0xffff, 2407 PGO_CLEANIT | PGO_SYNCIO); 2408 if (error) 2409 break; 2410 } 2411 } 2412 2413 /* synchronous I/O? */ 2414 if (error == 0 && ap->a_ioflag & IO_SYNC) { 2415 rw_enter(vp->v_uobj.vmobjlock, RW_WRITER); 2416 error = VOP_PUTPAGES(vp, trunc_page(origoff), 2417 round_page(uio->uio_offset), 2418 PGO_CLEANIT | PGO_SYNCIO); 2419 2420 /* write through page cache? */ 2421 } else if (error == 0 && pmp->pmp_flags & PUFFS_KFLAG_WTCACHE) { 2422 rw_enter(vp->v_uobj.vmobjlock, RW_WRITER); 2423 error = VOP_PUTPAGES(vp, trunc_page(origoff), 2424 round_page(uio->uio_offset), PGO_CLEANIT); 2425 } 2426 } else { 2427 /* tomove is non-increasing */ 2428 tomove = PUFFS_TOMOVE(uio->uio_resid, pmp); 2429 argsize = sizeof(struct puffs_vnmsg_write) + tomove; 2430 puffs_msgmem_alloc(argsize, &park_write, (void *)&write_msg,1); 2431 2432 while (uio->uio_resid > 0) { 2433 /* move data to buffer */ 2434 tomove = PUFFS_TOMOVE(uio->uio_resid, pmp); 2435 memset(write_msg, 0, argsize); /* XXX: touser KASSERT */ 2436 RWARGS(write_msg, ap->a_ioflag, tomove, 2437 uio->uio_offset, ap->a_cred); 2438 error = uiomove(write_msg->pvnr_data, tomove, uio); 2439 if (error) 2440 break; 2441 2442 /* move buffer to userspace */ 2443 puffs_msg_setinfo(park_write, PUFFSOP_VN, 2444 PUFFS_VN_WRITE, VPTOPNC(vp)); 2445 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_write, vp->v_data, 2446 NULL, error); 2447 error = checkerr(pmp, error, __func__); 2448 if (error) 2449 break; 2450 2451 if (write_msg->pvnr_resid > tomove) { 2452 puffs_senderr(pmp, PUFFS_ERR_WRITE, 2453 E2BIG, "resid grew", VPTOPNC(ap->a_vp)); 2454 error = EPROTO; 2455 break; 2456 } 2457 2458 /* adjust file size */ 2459 if (vp->v_size < uio->uio_offset) { 2460 uflags |= PUFFS_UPDATESIZE; 2461 uvm_vnp_setsize(vp, uio->uio_offset); 2462 } 2463 2464 /* didn't move everything? bad userspace. bail */ 2465 if (write_msg->pvnr_resid != 0) { 2466 error = EIO; 2467 break; 2468 } 2469 } 2470 puffs_msgmem_release(park_write); 2471 2472 /* 2473 * Direct I/O on write but not on read: we must 2474 * invlidate the written pages so that we read 2475 * the written data and not the stalled cache. 2476 */ 2477 if ((error == 0) && 2478 (vp->v_type == VREG) && PUFFS_USE_PAGECACHE(pmp) && 2479 (pn->pn_stat & PNODE_WDIRECT) && 2480 !(pn->pn_stat & PNODE_RDIRECT)) { 2481 voff_t off_lo = trunc_page(origoff); 2482 voff_t off_hi = round_page(uio->uio_offset); 2483 2484 rw_enter(vp->v_uobj.vmobjlock, RW_WRITER); 2485 error = VOP_PUTPAGES(vp, off_lo, off_hi, PGO_FREE); 2486 } 2487 } 2488 2489 if (vp->v_mount->mnt_flag & MNT_RELATIME) 2490 uflags |= PUFFS_UPDATEATIME; 2491 uflags |= PUFFS_UPDATECTIME; 2492 uflags |= PUFFS_UPDATEMTIME; 2493 puffs_updatenode(VPTOPP(vp), uflags, vp->v_size); 2494 2495 /* 2496 * If we do not use meta flush, we need to update the 2497 * filesystem now, otherwise we will get a stale value 2498 * on the next GETATTR 2499 */ 2500 if (!PUFFS_USE_METAFLUSH(pmp) && (uflags & PUFFS_UPDATESIZE)) { 2501 struct vattr va; 2502 int ret; 2503 2504 vattr_null(&va); 2505 va.va_size = vp->v_size; 2506 ret = dosetattr(vp, &va, FSCRED, 0); 2507 if (ret) { 2508 DPRINTF(("dosetattr set size to %jd failed: %d\n", 2509 (intmax_t)vp->v_size, ret)); 2510 } 2511 } 2512 mutex_exit(&pn->pn_sizemtx); 2513 return error; 2514 } 2515 2516 int 2517 puffs_vnop_fallocate(void *v) 2518 { 2519 struct vop_fallocate_args /* { 2520 const struct vnodeop_desc *a_desc; 2521 struct vnode *a_vp; 2522 off_t a_pos; 2523 off_t a_len; 2524 } */ *ap = v; 2525 struct vnode *vp = ap->a_vp; 2526 struct puffs_node *pn = VPTOPP(vp); 2527 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2528 PUFFS_MSG_VARS(vn, fallocate); 2529 int error; 2530 2531 mutex_enter(&pn->pn_sizemtx); 2532 2533 PUFFS_MSG_ALLOC(vn, fallocate); 2534 fallocate_msg->pvnr_off = ap->a_pos; 2535 fallocate_msg->pvnr_len = ap->a_len; 2536 puffs_msg_setinfo(park_fallocate, PUFFSOP_VN, 2537 PUFFS_VN_FALLOCATE, VPTOPNC(vp)); 2538 2539 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_fallocate, vp->v_data, NULL, error); 2540 error = checkerr(pmp, error, __func__); 2541 PUFFS_MSG_RELEASE(fallocate); 2542 2543 switch (error) { 2544 case 0: 2545 break; 2546 case EAGAIN: 2547 error = EIO; 2548 /* FALLTHROUGH */ 2549 default: 2550 goto out; 2551 } 2552 2553 if (ap->a_pos + ap->a_len > vp->v_size) { 2554 uvm_vnp_setsize(vp, ap->a_pos + ap->a_len); 2555 puffs_updatenode(pn, PUFFS_UPDATESIZE, vp->v_size); 2556 } 2557 out: 2558 mutex_exit(&pn->pn_sizemtx); 2559 2560 return error; 2561 } 2562 2563 int 2564 puffs_vnop_fdiscard(void *v) 2565 { 2566 struct vop_fdiscard_args /* { 2567 const struct vnodeop_desc *a_desc; 2568 struct vnode *a_vp; 2569 off_t a_pos; 2570 off_t a_len; 2571 } */ *ap = v; 2572 struct vnode *vp = ap->a_vp; 2573 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2574 PUFFS_MSG_VARS(vn, fdiscard); 2575 int error; 2576 2577 PUFFS_MSG_ALLOC(vn, fdiscard); 2578 fdiscard_msg->pvnr_off = ap->a_pos; 2579 fdiscard_msg->pvnr_len = ap->a_len; 2580 puffs_msg_setinfo(park_fdiscard, PUFFSOP_VN, 2581 PUFFS_VN_FALLOCATE, VPTOPNC(vp)); 2582 2583 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_fdiscard, vp->v_data, NULL, error); 2584 error = checkerr(pmp, error, __func__); 2585 PUFFS_MSG_RELEASE(fdiscard); 2586 2587 return error; 2588 } 2589 2590 int 2591 puffs_vnop_print(void *v) 2592 { 2593 struct vop_print_args /* { 2594 struct vnode *a_vp; 2595 } */ *ap = v; 2596 PUFFS_MSG_VARS(vn, print); 2597 struct vnode *vp = ap->a_vp; 2598 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2599 struct puffs_node *pn = vp->v_data; 2600 2601 /* kernel portion */ 2602 printf("tag VT_PUFFS, vnode %p, puffs node: %p,\n" 2603 "\tuserspace cookie: %p", vp, pn, pn->pn_cookie); 2604 if (vp->v_type == VFIFO) 2605 VOCALL(fifo_vnodeop_p, VOFFSET(vop_print), v); 2606 printf("\n"); 2607 2608 /* userspace portion */ 2609 if (EXISTSOP(pmp, PRINT)) { 2610 PUFFS_MSG_ALLOC(vn, print); 2611 puffs_msg_setinfo(park_print, PUFFSOP_VN, 2612 PUFFS_VN_PRINT, VPTOPNC(vp)); 2613 PUFFS_MSG_ENQUEUEWAIT2_NOERROR(pmp, park_print, vp->v_data, 2614 NULL); 2615 PUFFS_MSG_RELEASE(print); 2616 } 2617 2618 return 0; 2619 } 2620 2621 int 2622 puffs_vnop_pathconf(void *v) 2623 { 2624 struct vop_pathconf_args /* { 2625 const struct vnodeop_desc *a_desc; 2626 struct vnode *a_vp; 2627 int a_name; 2628 register_t *a_retval; 2629 } */ *ap = v; 2630 PUFFS_MSG_VARS(vn, pathconf); 2631 struct vnode *vp = ap->a_vp; 2632 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2633 int error; 2634 2635 PUFFS_MSG_ALLOC(vn, pathconf); 2636 pathconf_msg->pvnr_name = ap->a_name; 2637 puffs_msg_setinfo(park_pathconf, PUFFSOP_VN, 2638 PUFFS_VN_PATHCONF, VPTOPNC(vp)); 2639 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_pathconf, vp->v_data, NULL, error); 2640 error = checkerr(pmp, error, __func__); 2641 if (!error) 2642 *ap->a_retval = pathconf_msg->pvnr_retval; 2643 PUFFS_MSG_RELEASE(pathconf); 2644 2645 return error; 2646 } 2647 2648 int 2649 puffs_vnop_advlock(void *v) 2650 { 2651 struct vop_advlock_args /* { 2652 const struct vnodeop_desc *a_desc; 2653 struct vnode *a_vp; 2654 void *a_id; 2655 int a_op; 2656 struct flock *a_fl; 2657 int a_flags; 2658 } */ *ap = v; 2659 PUFFS_MSG_VARS(vn, advlock); 2660 struct vnode *vp = ap->a_vp; 2661 struct puffs_node *pn = VPTOPP(vp); 2662 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2663 int error; 2664 2665 if (!EXISTSOP(pmp, ADVLOCK)) 2666 return lf_advlock(ap, &pn->pn_lockf, vp->v_size); 2667 2668 PUFFS_MSG_ALLOC(vn, advlock); 2669 (void)memcpy(&advlock_msg->pvnr_fl, ap->a_fl, 2670 sizeof(advlock_msg->pvnr_fl)); 2671 advlock_msg->pvnr_id = ap->a_id; 2672 advlock_msg->pvnr_op = ap->a_op; 2673 advlock_msg->pvnr_flags = ap->a_flags; 2674 puffs_msg_setinfo(park_advlock, PUFFSOP_VN, 2675 PUFFS_VN_ADVLOCK, VPTOPNC(vp)); 2676 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_advlock, vp->v_data, NULL, error); 2677 error = checkerr(pmp, error, __func__); 2678 PUFFS_MSG_RELEASE(advlock); 2679 2680 return error; 2681 } 2682 2683 int 2684 puffs_vnop_abortop(void *v) 2685 { 2686 struct vop_abortop_args /* { 2687 struct vnode *a_dvp; 2688 struct componentname *a_cnp; 2689 }; */ *ap = v; 2690 PUFFS_MSG_VARS(vn, abortop); 2691 struct vnode *dvp = ap->a_dvp; 2692 struct puffs_mount *pmp = MPTOPUFFSMP(dvp->v_mount); 2693 struct componentname *cnp = ap->a_cnp; 2694 2695 if (EXISTSOP(pmp, ABORTOP)) { 2696 PUFFS_MSG_ALLOC(vn, abortop); 2697 puffs_makecn(&abortop_msg->pvnr_cn, &abortop_msg->pvnr_cn_cred, 2698 cnp, PUFFS_USE_FULLPNBUF(pmp)); 2699 puffs_msg_setfaf(park_abortop); 2700 puffs_msg_setinfo(park_abortop, PUFFSOP_VN, 2701 PUFFS_VN_ABORTOP, VPTOPNC(dvp)); 2702 2703 puffs_msg_enqueue(pmp, park_abortop); 2704 PUFFS_MSG_RELEASE(abortop); 2705 } 2706 2707 return genfs_abortop(v); 2708 } 2709 2710 #define BIOASYNC(bp) (bp->b_flags & B_ASYNC) 2711 2712 /* 2713 * This maps itself to PUFFS_VN_READ/WRITE for data transfer. 2714 */ 2715 int 2716 puffs_vnop_strategy(void *v) 2717 { 2718 struct vop_strategy_args /* { 2719 const struct vnodeop_desc *a_desc; 2720 struct vnode *a_vp; 2721 struct buf *a_bp; 2722 } */ *ap = v; 2723 PUFFS_MSG_VARS(vn, rw); 2724 struct vnode *vp = ap->a_vp; 2725 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2726 struct puffs_node *pn; 2727 struct buf *bp; 2728 size_t argsize; 2729 size_t tomove, moved; 2730 int error, dofaf, cansleep, dobiodone; 2731 2732 pmp = MPTOPUFFSMP(vp->v_mount); 2733 bp = ap->a_bp; 2734 error = 0; 2735 dofaf = 0; 2736 cansleep = 0; 2737 pn = VPTOPP(vp); 2738 park_rw = NULL; /* explicit */ 2739 dobiodone = 1; 2740 2741 if ((BUF_ISREAD(bp) && !EXISTSOP(pmp, READ)) 2742 || (BUF_ISWRITE(bp) && !EXISTSOP(pmp, WRITE))) 2743 ERROUT(EOPNOTSUPP); 2744 2745 /* 2746 * Short-circuit optimization: don't flush buffer in between 2747 * VOP_INACTIVE and VOP_RECLAIM in case the node has no references. 2748 */ 2749 if (pn->pn_stat & PNODE_DYING) { 2750 KASSERT(BUF_ISWRITE(bp)); 2751 bp->b_resid = 0; 2752 goto out; 2753 } 2754 2755 #ifdef DIAGNOSTIC 2756 if (bp->b_bcount > pmp->pmp_msg_maxsize - PUFFS_MSGSTRUCT_MAX) 2757 panic("puffs_strategy: wildly inappropriate buf bcount %d", 2758 bp->b_bcount); 2759 #endif 2760 2761 /* 2762 * See explanation for the necessity of a FAF in puffs_fsync. 2763 * 2764 * Also, do FAF in case we're suspending. 2765 * See puffs_vfsops.c:pageflush() 2766 */ 2767 if (BUF_ISWRITE(bp)) { 2768 mutex_enter(vp->v_interlock); 2769 if (vdead_check(vp, VDEAD_NOWAIT) != 0) 2770 dofaf = 1; 2771 if (pn->pn_stat & PNODE_FAF) 2772 dofaf = 1; 2773 mutex_exit(vp->v_interlock); 2774 } 2775 2776 cansleep = (curlwp == uvm.pagedaemon_lwp || dofaf) ? 0 : 1; 2777 2778 KASSERT(curlwp != uvm.pagedaemon_lwp || dofaf || BIOASYNC(bp)); 2779 2780 /* allocate transport structure */ 2781 tomove = PUFFS_TOMOVE(bp->b_bcount, pmp); 2782 argsize = sizeof(struct puffs_vnmsg_rw); 2783 error = puffs_msgmem_alloc(argsize + tomove, &park_rw, 2784 (void *)&rw_msg, cansleep); 2785 if (error) 2786 goto out; 2787 RWARGS(rw_msg, 0, tomove, bp->b_blkno << DEV_BSHIFT, FSCRED); 2788 2789 /* 2x2 cases: read/write, faf/nofaf */ 2790 if (BUF_ISREAD(bp)) { 2791 puffs_msg_setinfo(park_rw, PUFFSOP_VN, 2792 PUFFS_VN_READ, VPTOPNC(vp)); 2793 puffs_msg_setdelta(park_rw, tomove); 2794 if (BIOASYNC(bp)) { 2795 puffs_msg_setcall(park_rw, 2796 puffs_parkdone_asyncbioread, bp); 2797 puffs_msg_enqueue(pmp, park_rw); 2798 dobiodone = 0; 2799 } else { 2800 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_rw, vp->v_data, 2801 NULL, error); 2802 error = checkerr(pmp, error, __func__); 2803 if (error) 2804 goto out; 2805 2806 if (rw_msg->pvnr_resid > tomove) { 2807 puffs_senderr(pmp, PUFFS_ERR_READ, 2808 E2BIG, "resid grew", VPTOPNC(vp)); 2809 ERROUT(EPROTO); 2810 } 2811 2812 moved = tomove - rw_msg->pvnr_resid; 2813 2814 (void)memcpy(bp->b_data, rw_msg->pvnr_data, moved); 2815 bp->b_resid = bp->b_bcount - moved; 2816 } 2817 } else { 2818 puffs_msg_setinfo(park_rw, PUFFSOP_VN, 2819 PUFFS_VN_WRITE, VPTOPNC(vp)); 2820 /* 2821 * make pages read-only before we write them if we want 2822 * write caching info 2823 */ 2824 if (PUFFS_WCACHEINFO(pmp)) { 2825 struct uvm_object *uobj = &vp->v_uobj; 2826 int npages = (bp->b_bcount + PAGE_SIZE-1) >> PAGE_SHIFT; 2827 struct vm_page *vmp; 2828 int i; 2829 2830 for (i = 0; i < npages; i++) { 2831 vmp= uvm_pageratop((vaddr_t)bp->b_data 2832 + (i << PAGE_SHIFT)); 2833 DPRINTF(("puffs_strategy: write-protecting " 2834 "vp %p page %p, offset %" PRId64"\n", 2835 vp, vmp, vmp->offset)); 2836 rw_enter(uobj->vmobjlock, RW_WRITER); 2837 vmp->flags |= PG_RDONLY; 2838 pmap_page_protect(vmp, VM_PROT_READ); 2839 rw_exit(uobj->vmobjlock); 2840 } 2841 } 2842 2843 (void)memcpy(&rw_msg->pvnr_data, bp->b_data, tomove); 2844 if (dofaf) { 2845 puffs_msg_setfaf(park_rw); 2846 } else if (BIOASYNC(bp)) { 2847 puffs_msg_setcall(park_rw, 2848 puffs_parkdone_asyncbiowrite, bp); 2849 dobiodone = 0; 2850 } 2851 2852 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_rw, vp->v_data, NULL, error); 2853 2854 if (dobiodone == 0) 2855 goto out; 2856 2857 error = checkerr(pmp, error, __func__); 2858 if (error) 2859 goto out; 2860 2861 if (rw_msg->pvnr_resid > tomove) { 2862 puffs_senderr(pmp, PUFFS_ERR_WRITE, 2863 E2BIG, "resid grew", VPTOPNC(vp)); 2864 ERROUT(EPROTO); 2865 } 2866 2867 /* 2868 * FAF moved everything. Frankly, we don't 2869 * really have a choice. 2870 */ 2871 if (dofaf && error == 0) 2872 moved = tomove; 2873 else 2874 moved = tomove - rw_msg->pvnr_resid; 2875 2876 bp->b_resid = bp->b_bcount - moved; 2877 if (bp->b_resid != 0) { 2878 ERROUT(EIO); 2879 } 2880 } 2881 2882 out: 2883 if (park_rw) 2884 puffs_msgmem_release(park_rw); 2885 2886 if (error) 2887 bp->b_error = error; 2888 2889 if (error || dobiodone) 2890 biodone(bp); 2891 2892 return error; 2893 } 2894 2895 int 2896 puffs_vnop_mmap(void *v) 2897 { 2898 struct vop_mmap_args /* { 2899 const struct vnodeop_desc *a_desc; 2900 struct vnode *a_vp; 2901 vm_prot_t a_prot; 2902 kauth_cred_t a_cred; 2903 } */ *ap = v; 2904 PUFFS_MSG_VARS(vn, mmap); 2905 struct vnode *vp = ap->a_vp; 2906 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2907 int error; 2908 2909 if (!PUFFS_USE_PAGECACHE(pmp)) 2910 return genfs_eopnotsupp(v); 2911 2912 if (EXISTSOP(pmp, MMAP)) { 2913 PUFFS_MSG_ALLOC(vn, mmap); 2914 mmap_msg->pvnr_prot = ap->a_prot; 2915 puffs_credcvt(&mmap_msg->pvnr_cred, ap->a_cred); 2916 puffs_msg_setinfo(park_mmap, PUFFSOP_VN, 2917 PUFFS_VN_MMAP, VPTOPNC(vp)); 2918 2919 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_mmap, vp->v_data, NULL, error); 2920 error = checkerr(pmp, error, __func__); 2921 PUFFS_MSG_RELEASE(mmap); 2922 } else { 2923 error = genfs_mmap(v); 2924 } 2925 2926 return error; 2927 } 2928 2929 2930 /* 2931 * The rest don't get a free trip to userspace and back, they 2932 * have to stay within the kernel. 2933 */ 2934 2935 /* 2936 * bmap doesn't really make any sense for puffs, so just 1:1 map it. 2937 * well, maybe somehow, somewhere, some day .... 2938 */ 2939 int 2940 puffs_vnop_bmap(void *v) 2941 { 2942 struct vop_bmap_args /* { 2943 const struct vnodeop_desc *a_desc; 2944 struct vnode *a_vp; 2945 daddr_t a_bn; 2946 struct vnode **a_vpp; 2947 daddr_t *a_bnp; 2948 int *a_runp; 2949 } */ *ap = v; 2950 struct puffs_mount *pmp; 2951 2952 pmp = MPTOPUFFSMP(ap->a_vp->v_mount); 2953 2954 if (ap->a_vpp) 2955 *ap->a_vpp = ap->a_vp; 2956 if (ap->a_bnp) 2957 *ap->a_bnp = ap->a_bn; 2958 if (ap->a_runp) 2959 *ap->a_runp 2960 = (PUFFS_TOMOVE(pmp->pmp_msg_maxsize, pmp)>>DEV_BSHIFT) - 1; 2961 2962 return 0; 2963 } 2964 2965 /* 2966 * Handle getpages faults in puffs. We let genfs_getpages() do most 2967 * of the dirty work, but we come in this route to do accounting tasks. 2968 * If the user server has specified functions for cache notifications 2969 * about reads and/or writes, we record which type of operation we got, 2970 * for which page range, and proceed to issue a FAF notification to the 2971 * server about it. 2972 */ 2973 int 2974 puffs_vnop_getpages(void *v) 2975 { 2976 struct vop_getpages_args /* { 2977 const struct vnodeop_desc *a_desc; 2978 struct vnode *a_vp; 2979 voff_t a_offset; 2980 struct vm_page **a_m; 2981 int *a_count; 2982 int a_centeridx; 2983 vm_prot_t a_access_type; 2984 int a_advice; 2985 int a_flags; 2986 } */ *ap = v; 2987 struct puffs_mount *pmp; 2988 struct puffs_node *pn; 2989 struct vnode *vp; 2990 struct vm_page **pgs; 2991 struct puffs_cacheinfo *pcinfo = NULL; 2992 struct puffs_cacherun *pcrun; 2993 void *parkmem = NULL; 2994 size_t runsizes; 2995 int i, npages, si, streakon; 2996 int error, locked, write; 2997 2998 pmp = MPTOPUFFSMP(ap->a_vp->v_mount); 2999 npages = *ap->a_count; 3000 pgs = ap->a_m; 3001 vp = ap->a_vp; 3002 pn = vp->v_data; 3003 locked = (ap->a_flags & PGO_LOCKED) != 0; 3004 write = (ap->a_access_type & VM_PROT_WRITE) != 0; 3005 3006 /* ccg xnaht - gets Wuninitialized wrong */ 3007 pcrun = NULL; 3008 runsizes = 0; 3009 3010 /* 3011 * Check that we aren't trying to fault in pages which our file 3012 * server doesn't know about. This happens if we extend a file by 3013 * skipping some pages and later try to fault in pages which 3014 * are between pn_serversize and vp_size. This check optimizes 3015 * away the common case where a file is being extended. 3016 */ 3017 if (ap->a_offset >= pn->pn_serversize && ap->a_offset < vp->v_size) { 3018 struct vattr va; 3019 3020 /* try again later when we can block */ 3021 if (locked) 3022 ERROUT(EBUSY); 3023 3024 rw_exit(vp->v_uobj.vmobjlock); 3025 vattr_null(&va); 3026 va.va_size = vp->v_size; 3027 error = dosetattr(vp, &va, FSCRED, 0); 3028 if (error) 3029 ERROUT(error); 3030 rw_enter(vp->v_uobj.vmobjlock, RW_WRITER); 3031 } 3032 3033 if (write && PUFFS_WCACHEINFO(pmp)) { 3034 #ifdef notnowjohn 3035 /* allocate worst-case memory */ 3036 runsizes = ((npages / 2) + 1) * sizeof(struct puffs_cacherun); 3037 KASSERT(curlwp != uvm.pagedaemon_lwp || locked); 3038 pcinfo = kmem_zalloc(sizeof(struct puffs_cacheinfo) + runsize, 3039 locked ? KM_NOSLEEP : KM_SLEEP); 3040 3041 /* 3042 * can't block if we're locked and can't mess up caching 3043 * information for fs server. so come back later, please 3044 */ 3045 if (pcinfo == NULL) 3046 ERROUT(ENOMEM); 3047 3048 parkmem = puffs_park_alloc(locked == 0); 3049 if (parkmem == NULL) 3050 ERROUT(ENOMEM); 3051 3052 pcrun = pcinfo->pcache_runs; 3053 #else 3054 (void)parkmem; 3055 #endif 3056 } 3057 3058 error = genfs_getpages(v); 3059 if (error) 3060 goto out; 3061 3062 if (PUFFS_WCACHEINFO(pmp) == 0) 3063 goto out; 3064 3065 /* 3066 * Let's see whose fault it was and inform the user server of 3067 * possibly read/written pages. Map pages from read faults 3068 * strictly read-only, since otherwise we might miss info on 3069 * when the page is actually write-faulted to. 3070 */ 3071 if (!locked) 3072 rw_enter(vp->v_uobj.vmobjlock, RW_WRITER); 3073 for (i = 0, si = 0, streakon = 0; i < npages; i++) { 3074 if (pgs[i] == NULL || pgs[i] == PGO_DONTCARE) { 3075 if (streakon && write) { 3076 streakon = 0; 3077 pcrun[si].pcache_runend 3078 = trunc_page(pgs[i]->offset) + PAGE_MASK; 3079 si++; 3080 } 3081 continue; 3082 } 3083 if (streakon == 0 && write) { 3084 streakon = 1; 3085 pcrun[si].pcache_runstart = pgs[i]->offset; 3086 } 3087 3088 if (!write) 3089 pgs[i]->flags |= PG_RDONLY; 3090 } 3091 /* was the last page part of our streak? */ 3092 if (streakon) { 3093 pcrun[si].pcache_runend 3094 = trunc_page(pgs[i-1]->offset) + PAGE_MASK; 3095 si++; 3096 } 3097 if (!locked) 3098 rw_exit(vp->v_uobj.vmobjlock); 3099 3100 KASSERT(si <= (npages / 2) + 1); 3101 3102 #ifdef notnowjohn 3103 /* send results to userspace */ 3104 if (write) 3105 puffs_cacheop(pmp, parkmem, pcinfo, 3106 sizeof(struct puffs_cacheinfo) + runsizes, VPTOPNC(vp)); 3107 #endif 3108 3109 out: 3110 if (error) { 3111 if (pcinfo != NULL) 3112 kmem_free(pcinfo, 3113 sizeof(struct puffs_cacheinfo) + runsizes); 3114 #ifdef notnowjohn 3115 if (parkmem != NULL) 3116 puffs_park_release(parkmem, 1); 3117 #endif 3118 } 3119 3120 return error; 3121 } 3122 3123 /* 3124 * Extended attribute support. 3125 */ 3126 3127 int 3128 puffs_vnop_getextattr(void *v) 3129 { 3130 struct vop_getextattr_args /* 3131 struct vnode *a_vp; 3132 int a_attrnamespace; 3133 const char *a_name; 3134 struct uio *a_uio; 3135 size_t *a_size; 3136 kauth_cred_t a_cred; 3137 }; */ *ap = v; 3138 PUFFS_MSG_VARS(vn, getextattr); 3139 struct vnode *vp = ap->a_vp; 3140 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 3141 int attrnamespace = ap->a_attrnamespace; 3142 const char *name = ap->a_name; 3143 struct uio *uio = ap->a_uio; 3144 size_t *sizep = ap->a_size; 3145 size_t tomove, resid; 3146 int error; 3147 3148 if (uio) 3149 resid = uio->uio_resid; 3150 else 3151 resid = 0; 3152 3153 tomove = PUFFS_TOMOVE(resid, pmp); 3154 if (tomove != resid) { 3155 error = E2BIG; 3156 goto out; 3157 } 3158 3159 puffs_msgmem_alloc(sizeof(struct puffs_vnmsg_getextattr) + tomove, 3160 &park_getextattr, (void *)&getextattr_msg, 1); 3161 3162 getextattr_msg->pvnr_attrnamespace = attrnamespace; 3163 strlcpy(getextattr_msg->pvnr_attrname, name, 3164 sizeof(getextattr_msg->pvnr_attrname)); 3165 puffs_credcvt(&getextattr_msg->pvnr_cred, ap->a_cred); 3166 if (sizep) 3167 getextattr_msg->pvnr_datasize = 1; 3168 getextattr_msg->pvnr_resid = tomove; 3169 3170 puffs_msg_setinfo(park_getextattr, 3171 PUFFSOP_VN, PUFFS_VN_GETEXTATTR, VPTOPNC(vp)); 3172 puffs_msg_setdelta(park_getextattr, tomove); 3173 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_getextattr, vp->v_data, NULL, error); 3174 3175 error = checkerr(pmp, error, __func__); 3176 if (error) 3177 goto out; 3178 3179 resid = getextattr_msg->pvnr_resid; 3180 if (resid > tomove) { 3181 puffs_senderr(pmp, PUFFS_ERR_GETEXTATTR, E2BIG, 3182 "resid grew", VPTOPNC(vp)); 3183 error = EPROTO; 3184 goto out; 3185 } 3186 3187 if (sizep) 3188 *sizep = getextattr_msg->pvnr_datasize; 3189 if (uio) 3190 error = uiomove(getextattr_msg->pvnr_data, tomove - resid, uio); 3191 3192 out: 3193 PUFFS_MSG_RELEASE(getextattr); 3194 return error; 3195 } 3196 3197 int 3198 puffs_vnop_setextattr(void *v) 3199 { 3200 struct vop_setextattr_args /* { 3201 struct vnode *a_vp; 3202 int a_attrnamespace; 3203 const char *a_name; 3204 struct uio *a_uio; 3205 kauth_cred_t a_cred; 3206 }; */ *ap = v; 3207 PUFFS_MSG_VARS(vn, setextattr); 3208 struct vnode *vp = ap->a_vp; 3209 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 3210 int attrnamespace = ap->a_attrnamespace; 3211 const char *name = ap->a_name; 3212 struct uio *uio = ap->a_uio; 3213 size_t tomove, resid; 3214 int error; 3215 3216 if (uio) 3217 resid = uio->uio_resid; 3218 else 3219 resid = 0; 3220 3221 tomove = PUFFS_TOMOVE(resid, pmp); 3222 if (tomove != resid) { 3223 error = E2BIG; 3224 goto out; 3225 } 3226 3227 puffs_msgmem_alloc(sizeof(struct puffs_vnmsg_setextattr) + tomove, 3228 &park_setextattr, (void *)&setextattr_msg, 1); 3229 3230 setextattr_msg->pvnr_attrnamespace = attrnamespace; 3231 strlcpy(setextattr_msg->pvnr_attrname, name, 3232 sizeof(setextattr_msg->pvnr_attrname)); 3233 puffs_credcvt(&setextattr_msg->pvnr_cred, ap->a_cred); 3234 setextattr_msg->pvnr_resid = tomove; 3235 3236 if (uio) { 3237 error = uiomove(setextattr_msg->pvnr_data, tomove, uio); 3238 if (error) 3239 goto out; 3240 } 3241 3242 puffs_msg_setinfo(park_setextattr, 3243 PUFFSOP_VN, PUFFS_VN_SETEXTATTR, VPTOPNC(vp)); 3244 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_setextattr, vp->v_data, NULL, error); 3245 3246 error = checkerr(pmp, error, __func__); 3247 if (error) 3248 goto out; 3249 3250 if (setextattr_msg->pvnr_resid != 0) 3251 error = EIO; 3252 3253 out: 3254 PUFFS_MSG_RELEASE(setextattr); 3255 3256 return error; 3257 } 3258 3259 int 3260 puffs_vnop_listextattr(void *v) 3261 { 3262 struct vop_listextattr_args /* { 3263 struct vnode *a_vp; 3264 int a_attrnamespace; 3265 struct uio *a_uio; 3266 size_t *a_size; 3267 int a_flag, 3268 kauth_cred_t a_cred; 3269 }; */ *ap = v; 3270 PUFFS_MSG_VARS(vn, listextattr); 3271 struct vnode *vp = ap->a_vp; 3272 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 3273 int attrnamespace = ap->a_attrnamespace; 3274 struct uio *uio = ap->a_uio; 3275 size_t *sizep = ap->a_size; 3276 int flag = ap->a_flag; 3277 size_t tomove, resid; 3278 int error; 3279 3280 if (uio) 3281 resid = uio->uio_resid; 3282 else 3283 resid = 0; 3284 3285 tomove = PUFFS_TOMOVE(resid, pmp); 3286 if (tomove != resid) { 3287 error = E2BIG; 3288 goto out; 3289 } 3290 3291 puffs_msgmem_alloc(sizeof(struct puffs_vnmsg_listextattr) + tomove, 3292 &park_listextattr, (void *)&listextattr_msg, 1); 3293 3294 listextattr_msg->pvnr_attrnamespace = attrnamespace; 3295 listextattr_msg->pvnr_flag = flag; 3296 puffs_credcvt(&listextattr_msg->pvnr_cred, ap->a_cred); 3297 listextattr_msg->pvnr_resid = tomove; 3298 if (sizep) 3299 listextattr_msg->pvnr_datasize = 1; 3300 3301 puffs_msg_setinfo(park_listextattr, 3302 PUFFSOP_VN, PUFFS_VN_LISTEXTATTR, VPTOPNC(vp)); 3303 puffs_msg_setdelta(park_listextattr, tomove); 3304 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_listextattr, vp->v_data, NULL, error); 3305 3306 error = checkerr(pmp, error, __func__); 3307 if (error) 3308 goto out; 3309 3310 resid = listextattr_msg->pvnr_resid; 3311 if (resid > tomove) { 3312 puffs_senderr(pmp, PUFFS_ERR_LISTEXTATTR, E2BIG, 3313 "resid grew", VPTOPNC(vp)); 3314 error = EPROTO; 3315 goto out; 3316 } 3317 3318 if (sizep) 3319 *sizep = listextattr_msg->pvnr_datasize; 3320 if (uio) 3321 error = uiomove(listextattr_msg->pvnr_data, tomove-resid, uio); 3322 3323 out: 3324 PUFFS_MSG_RELEASE(listextattr); 3325 return error; 3326 } 3327 3328 int 3329 puffs_vnop_deleteextattr(void *v) 3330 { 3331 struct vop_deleteextattr_args /* { 3332 struct vnode *a_vp; 3333 int a_attrnamespace; 3334 const char *a_name; 3335 kauth_cred_t a_cred; 3336 }; */ *ap = v; 3337 PUFFS_MSG_VARS(vn, deleteextattr); 3338 struct vnode *vp = ap->a_vp; 3339 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 3340 int attrnamespace = ap->a_attrnamespace; 3341 const char *name = ap->a_name; 3342 int error; 3343 3344 PUFFS_MSG_ALLOC(vn, deleteextattr); 3345 deleteextattr_msg->pvnr_attrnamespace = attrnamespace; 3346 strlcpy(deleteextattr_msg->pvnr_attrname, name, 3347 sizeof(deleteextattr_msg->pvnr_attrname)); 3348 puffs_credcvt(&deleteextattr_msg->pvnr_cred, ap->a_cred); 3349 3350 puffs_msg_setinfo(park_deleteextattr, 3351 PUFFSOP_VN, PUFFS_VN_DELETEEXTATTR, VPTOPNC(vp)); 3352 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_deleteextattr, 3353 vp->v_data, NULL, error); 3354 3355 error = checkerr(pmp, error, __func__); 3356 3357 PUFFS_MSG_RELEASE(deleteextattr); 3358 return error; 3359 } 3360 3361 /* 3362 * spec & fifo. These call the miscfs spec and fifo vectors, but issue 3363 * FAF update information for the puffs node first. 3364 */ 3365 int 3366 puffs_vnop_spec_read(void *v) 3367 { 3368 struct vop_read_args /* { 3369 const struct vnodeop_desc *a_desc; 3370 struct vnode *a_vp; 3371 struct uio *a_uio; 3372 int a_ioflag; 3373 kauth_cred_t a_cred; 3374 } */ *ap = v; 3375 3376 puffs_updatenode(VPTOPP(ap->a_vp), PUFFS_UPDATEATIME, 0); 3377 return VOCALL(spec_vnodeop_p, VOFFSET(vop_read), v); 3378 } 3379 3380 int 3381 puffs_vnop_spec_write(void *v) 3382 { 3383 struct vop_write_args /* { 3384 const struct vnodeop_desc *a_desc; 3385 struct vnode *a_vp; 3386 struct uio *a_uio; 3387 int a_ioflag; 3388 kauth_cred_t a_cred; 3389 } */ *ap = v; 3390 3391 puffs_updatenode(VPTOPP(ap->a_vp), PUFFS_UPDATEMTIME, 0); 3392 return VOCALL(spec_vnodeop_p, VOFFSET(vop_write), v); 3393 } 3394 3395 int 3396 puffs_vnop_fifo_read(void *v) 3397 { 3398 struct vop_read_args /* { 3399 const struct vnodeop_desc *a_desc; 3400 struct vnode *a_vp; 3401 struct uio *a_uio; 3402 int a_ioflag; 3403 kauth_cred_t a_cred; 3404 } */ *ap = v; 3405 3406 puffs_updatenode(VPTOPP(ap->a_vp), PUFFS_UPDATEATIME, 0); 3407 return VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), v); 3408 } 3409 3410 int 3411 puffs_vnop_fifo_write(void *v) 3412 { 3413 struct vop_write_args /* { 3414 const struct vnodeop_desc *a_desc; 3415 struct vnode *a_vp; 3416 struct uio *a_uio; 3417 int a_ioflag; 3418 kauth_cred_t a_cred; 3419 } */ *ap = v; 3420 3421 puffs_updatenode(VPTOPP(ap->a_vp), PUFFS_UPDATEMTIME, 0); 3422 return VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), v); 3423 } 3424
Indexes created Wed Oct 01 15:09:59 GMT 2025