puffs_vnops.c revision 1.123
1 /* $NetBSD: puffs_vnops.c,v 1.123 2007/12/30 23:04:12 pooka 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 1.123 2007/12/30 23:04:12 pooka Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/fstrans.h> 37 #include <sys/malloc.h> 38 #include <sys/mount.h> 39 #include <sys/namei.h> 40 #include <sys/vnode.h> 41 #include <sys/proc.h> 42 43 #include <uvm/uvm.h> 44 45 #include <fs/puffs/puffs_msgif.h> 46 #include <fs/puffs/puffs_sys.h> 47 48 #include <miscfs/fifofs/fifo.h> 49 #include <miscfs/genfs/genfs.h> 50 #include <miscfs/specfs/specdev.h> 51 52 int puffs_vnop_lookup(void *); 53 int puffs_vnop_create(void *); 54 int puffs_vnop_access(void *); 55 int puffs_vnop_mknod(void *); 56 int puffs_vnop_open(void *); 57 int puffs_vnop_close(void *); 58 int puffs_vnop_getattr(void *); 59 int puffs_vnop_setattr(void *); 60 int puffs_vnop_reclaim(void *); 61 int puffs_vnop_readdir(void *); 62 int puffs_vnop_poll(void *); 63 int puffs_vnop_fsync(void *); 64 int puffs_vnop_seek(void *); 65 int puffs_vnop_remove(void *); 66 int puffs_vnop_mkdir(void *); 67 int puffs_vnop_rmdir(void *); 68 int puffs_vnop_link(void *); 69 int puffs_vnop_readlink(void *); 70 int puffs_vnop_symlink(void *); 71 int puffs_vnop_rename(void *); 72 int puffs_vnop_read(void *); 73 int puffs_vnop_write(void *); 74 int puffs_vnop_fcntl(void *); 75 int puffs_vnop_ioctl(void *); 76 int puffs_vnop_inactive(void *); 77 int puffs_vnop_print(void *); 78 int puffs_vnop_pathconf(void *); 79 int puffs_vnop_advlock(void *); 80 int puffs_vnop_strategy(void *); 81 int puffs_vnop_bmap(void *); 82 int puffs_vnop_mmap(void *); 83 int puffs_vnop_getpages(void *); 84 85 int puffs_vnop_spec_read(void *); 86 int puffs_vnop_spec_write(void *); 87 int puffs_vnop_fifo_read(void *); 88 int puffs_vnop_fifo_write(void *); 89 90 int puffs_vnop_checkop(void *); 91 92 93 #if 0 94 #define puffs_lock genfs_lock 95 #define puffs_unlock genfs_unlock 96 #define puffs_islocked genfs_islocked 97 #else 98 int puffs_vnop_lock(void *); 99 int puffs_vnop_unlock(void *); 100 int puffs_vnop_islocked(void *); 101 #endif 102 103 int (**puffs_vnodeop_p)(void *); 104 const struct vnodeopv_entry_desc puffs_vnodeop_entries[] = { 105 { &vop_default_desc, vn_default_error }, 106 { &vop_lookup_desc, puffs_vnop_lookup }, /* REAL lookup */ 107 { &vop_create_desc, puffs_vnop_checkop }, /* create */ 108 { &vop_mknod_desc, puffs_vnop_checkop }, /* mknod */ 109 { &vop_open_desc, puffs_vnop_open }, /* REAL open */ 110 { &vop_close_desc, puffs_vnop_checkop }, /* close */ 111 { &vop_access_desc, puffs_vnop_access }, /* REAL access */ 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_fsync_desc, puffs_vnop_fsync }, /* REAL fsync */ 117 { &vop_seek_desc, puffs_vnop_checkop }, /* seek */ 118 { &vop_remove_desc, puffs_vnop_checkop }, /* remove */ 119 { &vop_link_desc, puffs_vnop_checkop }, /* link */ 120 { &vop_rename_desc, puffs_vnop_checkop }, /* rename */ 121 { &vop_mkdir_desc, puffs_vnop_checkop }, /* mkdir */ 122 { &vop_rmdir_desc, puffs_vnop_checkop }, /* rmdir */ 123 { &vop_symlink_desc, puffs_vnop_checkop }, /* symlink */ 124 { &vop_readdir_desc, puffs_vnop_checkop }, /* readdir */ 125 { &vop_readlink_desc, puffs_vnop_checkop }, /* readlink */ 126 { &vop_getpages_desc, puffs_vnop_checkop }, /* getpages */ 127 { &vop_putpages_desc, genfs_putpages }, /* REAL putpages */ 128 { &vop_pathconf_desc, puffs_vnop_checkop }, /* pathconf */ 129 { &vop_advlock_desc, puffs_vnop_checkop }, /* advlock */ 130 { &vop_strategy_desc, puffs_vnop_strategy }, /* REAL strategy */ 131 { &vop_revoke_desc, genfs_revoke }, /* REAL revoke */ 132 { &vop_abortop_desc, genfs_abortop }, /* REAL abortop */ 133 { &vop_inactive_desc, puffs_vnop_inactive }, /* REAL inactive */ 134 { &vop_reclaim_desc, puffs_vnop_reclaim }, /* REAL reclaim */ 135 { &vop_lock_desc, puffs_vnop_lock }, /* REAL lock */ 136 { &vop_unlock_desc, puffs_vnop_unlock }, /* REAL unlock */ 137 { &vop_bmap_desc, puffs_vnop_bmap }, /* REAL bmap */ 138 { &vop_print_desc, puffs_vnop_print }, /* REAL print */ 139 { &vop_islocked_desc, puffs_vnop_islocked }, /* REAL islocked */ 140 { &vop_bwrite_desc, genfs_nullop }, /* REAL bwrite */ 141 { &vop_mmap_desc, puffs_vnop_mmap }, /* REAL mmap */ 142 { &vop_poll_desc, puffs_vnop_poll }, /* REAL poll */ 143 144 { &vop_kqfilter_desc, genfs_eopnotsupp }, /* kqfilter XXX */ 145 { NULL, NULL } 146 }; 147 const struct vnodeopv_desc puffs_vnodeop_opv_desc = 148 { &puffs_vnodeop_p, puffs_vnodeop_entries }; 149 150 151 int (**puffs_specop_p)(void *); 152 const struct vnodeopv_entry_desc puffs_specop_entries[] = { 153 { &vop_default_desc, vn_default_error }, 154 { &vop_lookup_desc, spec_lookup }, /* lookup, ENOTDIR */ 155 { &vop_create_desc, spec_create }, /* genfs_badop */ 156 { &vop_mknod_desc, spec_mknod }, /* genfs_badop */ 157 { &vop_open_desc, spec_open }, /* spec_open */ 158 { &vop_close_desc, spec_close }, /* spec_close */ 159 { &vop_access_desc, puffs_vnop_checkop }, /* access */ 160 { &vop_getattr_desc, puffs_vnop_checkop }, /* getattr */ 161 { &vop_setattr_desc, puffs_vnop_checkop }, /* setattr */ 162 { &vop_read_desc, puffs_vnop_spec_read }, /* update, read */ 163 { &vop_write_desc, puffs_vnop_spec_write }, /* update, write */ 164 { &vop_lease_desc, spec_lease_check }, /* genfs_nullop */ 165 { &vop_ioctl_desc, spec_ioctl }, /* spec_ioctl */ 166 { &vop_fcntl_desc, genfs_fcntl }, /* dummy */ 167 { &vop_poll_desc, spec_poll }, /* spec_poll */ 168 { &vop_kqfilter_desc, spec_kqfilter }, /* spec_kqfilter */ 169 { &vop_revoke_desc, spec_revoke }, /* genfs_revoke */ 170 { &vop_mmap_desc, spec_mmap }, /* spec_mmap */ 171 { &vop_fsync_desc, spec_fsync }, /* vflushbuf */ 172 { &vop_seek_desc, spec_seek }, /* genfs_nullop */ 173 { &vop_remove_desc, spec_remove }, /* genfs_badop */ 174 { &vop_link_desc, spec_link }, /* genfs_badop */ 175 { &vop_rename_desc, spec_rename }, /* genfs_badop */ 176 { &vop_mkdir_desc, spec_mkdir }, /* genfs_badop */ 177 { &vop_rmdir_desc, spec_rmdir }, /* genfs_badop */ 178 { &vop_symlink_desc, spec_symlink }, /* genfs_badop */ 179 { &vop_readdir_desc, spec_readdir }, /* genfs_badop */ 180 { &vop_readlink_desc, spec_readlink }, /* genfs_badop */ 181 { &vop_abortop_desc, spec_abortop }, /* genfs_badop */ 182 { &vop_inactive_desc, puffs_vnop_inactive }, /* REAL inactive */ 183 { &vop_reclaim_desc, puffs_vnop_reclaim }, /* REAL reclaim */ 184 { &vop_lock_desc, puffs_vnop_lock }, /* REAL lock */ 185 { &vop_unlock_desc, puffs_vnop_unlock }, /* REAL unlock */ 186 { &vop_bmap_desc, spec_bmap }, /* dummy */ 187 { &vop_strategy_desc, spec_strategy }, /* dev strategy */ 188 { &vop_print_desc, puffs_vnop_print }, /* REAL print */ 189 { &vop_islocked_desc, puffs_vnop_islocked }, /* REAL islocked */ 190 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 191 { &vop_advlock_desc, spec_advlock }, /* lf_advlock */ 192 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 193 { &vop_getpages_desc, spec_getpages }, /* genfs_getpages */ 194 { &vop_putpages_desc, spec_putpages }, /* genfs_putpages */ 195 #if 0 196 { &vop_openextattr_desc, _openextattr }, /* openextattr */ 197 { &vop_closeextattr_desc, _closeextattr }, /* closeextattr */ 198 { &vop_getextattr_desc, _getextattr }, /* getextattr */ 199 { &vop_setextattr_desc, _setextattr }, /* setextattr */ 200 { &vop_listextattr_desc, _listextattr }, /* listextattr */ 201 { &vop_deleteextattr_desc, _deleteextattr }, /* deleteextattr */ 202 #endif 203 { NULL, NULL } 204 }; 205 const struct vnodeopv_desc puffs_specop_opv_desc = 206 { &puffs_specop_p, puffs_specop_entries }; 207 208 209 int (**puffs_fifoop_p)(void *); 210 const struct vnodeopv_entry_desc puffs_fifoop_entries[] = { 211 { &vop_default_desc, vn_default_error }, 212 { &vop_lookup_desc, fifo_lookup }, /* lookup, ENOTDIR */ 213 { &vop_create_desc, fifo_create }, /* genfs_badop */ 214 { &vop_mknod_desc, fifo_mknod }, /* genfs_badop */ 215 { &vop_open_desc, fifo_open }, /* open */ 216 { &vop_close_desc, fifo_close }, /* close */ 217 { &vop_access_desc, puffs_vnop_checkop }, /* access */ 218 { &vop_getattr_desc, puffs_vnop_checkop }, /* getattr */ 219 { &vop_setattr_desc, puffs_vnop_checkop }, /* setattr */ 220 { &vop_read_desc, puffs_vnop_fifo_read }, /* read, update */ 221 { &vop_write_desc, puffs_vnop_fifo_write }, /* write, update */ 222 { &vop_lease_desc, fifo_lease_check }, /* genfs_nullop */ 223 { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ 224 { &vop_fcntl_desc, genfs_fcntl }, /* dummy */ 225 { &vop_poll_desc, fifo_poll }, /* poll */ 226 { &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */ 227 { &vop_revoke_desc, fifo_revoke }, /* genfs_revoke */ 228 { &vop_mmap_desc, fifo_mmap }, /* genfs_badop */ 229 { &vop_fsync_desc, fifo_fsync }, /* genfs_nullop*/ 230 { &vop_seek_desc, fifo_seek }, /* genfs_badop */ 231 { &vop_remove_desc, fifo_remove }, /* genfs_badop */ 232 { &vop_link_desc, fifo_link }, /* genfs_badop */ 233 { &vop_rename_desc, fifo_rename }, /* genfs_badop */ 234 { &vop_mkdir_desc, fifo_mkdir }, /* genfs_badop */ 235 { &vop_rmdir_desc, fifo_rmdir }, /* genfs_badop */ 236 { &vop_symlink_desc, fifo_symlink }, /* genfs_badop */ 237 { &vop_readdir_desc, fifo_readdir }, /* genfs_badop */ 238 { &vop_readlink_desc, fifo_readlink }, /* genfs_badop */ 239 { &vop_abortop_desc, fifo_abortop }, /* genfs_badop */ 240 { &vop_inactive_desc, puffs_vnop_inactive }, /* REAL inactive */ 241 { &vop_reclaim_desc, puffs_vnop_reclaim }, /* REAL reclaim */ 242 { &vop_lock_desc, puffs_vnop_lock }, /* REAL lock */ 243 { &vop_unlock_desc, puffs_vnop_unlock }, /* REAL unlock */ 244 { &vop_bmap_desc, fifo_bmap }, /* dummy */ 245 { &vop_strategy_desc, fifo_strategy }, /* genfs_badop */ 246 { &vop_print_desc, puffs_vnop_print }, /* REAL print */ 247 { &vop_islocked_desc, puffs_vnop_islocked }, /* REAL islocked */ 248 { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */ 249 { &vop_advlock_desc, fifo_advlock }, /* genfs_einval */ 250 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 251 { &vop_putpages_desc, fifo_putpages }, /* genfs_null_putpages*/ 252 #if 0 253 { &vop_openextattr_desc, _openextattr }, /* openextattr */ 254 { &vop_closeextattr_desc, _closeextattr }, /* closeextattr */ 255 { &vop_getextattr_desc, _getextattr }, /* getextattr */ 256 { &vop_setextattr_desc, _setextattr }, /* setextattr */ 257 { &vop_listextattr_desc, _listextattr }, /* listextattr */ 258 { &vop_deleteextattr_desc, _deleteextattr }, /* deleteextattr */ 259 #endif 260 { NULL, NULL } 261 }; 262 const struct vnodeopv_desc puffs_fifoop_opv_desc = 263 { &puffs_fifoop_p, puffs_fifoop_entries }; 264 265 266 /* "real" vnode operations */ 267 int (**puffs_msgop_p)(void *); 268 const struct vnodeopv_entry_desc puffs_msgop_entries[] = { 269 { &vop_default_desc, vn_default_error }, 270 { &vop_create_desc, puffs_vnop_create }, /* create */ 271 { &vop_mknod_desc, puffs_vnop_mknod }, /* mknod */ 272 { &vop_open_desc, puffs_vnop_open }, /* open */ 273 { &vop_close_desc, puffs_vnop_close }, /* close */ 274 { &vop_access_desc, puffs_vnop_access }, /* access */ 275 { &vop_getattr_desc, puffs_vnop_getattr }, /* getattr */ 276 { &vop_setattr_desc, puffs_vnop_setattr }, /* setattr */ 277 { &vop_read_desc, puffs_vnop_read }, /* read */ 278 { &vop_write_desc, puffs_vnop_write }, /* write */ 279 { &vop_seek_desc, puffs_vnop_seek }, /* seek */ 280 { &vop_remove_desc, puffs_vnop_remove }, /* remove */ 281 { &vop_link_desc, puffs_vnop_link }, /* link */ 282 { &vop_rename_desc, puffs_vnop_rename }, /* rename */ 283 { &vop_mkdir_desc, puffs_vnop_mkdir }, /* mkdir */ 284 { &vop_rmdir_desc, puffs_vnop_rmdir }, /* rmdir */ 285 { &vop_symlink_desc, puffs_vnop_symlink }, /* symlink */ 286 { &vop_readdir_desc, puffs_vnop_readdir }, /* readdir */ 287 { &vop_readlink_desc, puffs_vnop_readlink }, /* readlink */ 288 { &vop_print_desc, puffs_vnop_print }, /* print */ 289 { &vop_islocked_desc, puffs_vnop_islocked }, /* islocked */ 290 { &vop_pathconf_desc, puffs_vnop_pathconf }, /* pathconf */ 291 { &vop_advlock_desc, puffs_vnop_advlock }, /* advlock */ 292 { &vop_getpages_desc, puffs_vnop_getpages }, /* getpages */ 293 { NULL, NULL } 294 }; 295 const struct vnodeopv_desc puffs_msgop_opv_desc = 296 { &puffs_msgop_p, puffs_msgop_entries }; 297 298 299 #define ERROUT(err) \ 300 do { \ 301 error = err; \ 302 goto out; \ 303 } while (/*CONSTCOND*/0) 304 305 /* 306 * This is a generic vnode operation handler. It checks if the necessary 307 * operations for the called vnode operation are implemented by userspace 308 * and either returns a dummy return value or proceeds to call the real 309 * vnode operation from puffs_msgop_v. 310 * 311 * XXX: this should described elsewhere and autogenerated, the complexity 312 * of the vnode operations vectors and their interrelationships is also 313 * getting a bit out of hand. Another problem is that we need this same 314 * information in the fs server code, so keeping the two in sync manually 315 * is not a viable (long term) plan. 316 */ 317 318 /* not supported, handle locking protocol */ 319 #define CHECKOP_NOTSUPP(op) \ 320 case VOP_##op##_DESCOFFSET: \ 321 if (pmp->pmp_vnopmask[PUFFS_VN_##op] == 0) \ 322 return genfs_eopnotsupp(v); \ 323 break 324 325 /* always succeed, no locking */ 326 #define CHECKOP_SUCCESS(op) \ 327 case VOP_##op##_DESCOFFSET: \ 328 if (pmp->pmp_vnopmask[PUFFS_VN_##op] == 0) \ 329 return 0; \ 330 break 331 332 int 333 puffs_vnop_checkop(void *v) 334 { 335 struct vop_generic_args /* { 336 struct vnodeop_desc *a_desc; 337 spooky mystery contents; 338 } */ *ap = v; 339 struct vnodeop_desc *desc = ap->a_desc; 340 struct puffs_mount *pmp; 341 struct vnode *vp; 342 int offset, rv; 343 344 offset = ap->a_desc->vdesc_vp_offsets[0]; 345 #ifdef DIAGNOSTIC 346 if (offset == VDESC_NO_OFFSET) 347 panic("puffs_checkop: no vnode, why did you call me?"); 348 #endif 349 vp = *VOPARG_OFFSETTO(struct vnode **, offset, ap); 350 pmp = MPTOPUFFSMP(vp->v_mount); 351 352 DPRINTF_VERBOSE(("checkop call %s (%d), vp %p\n", 353 ap->a_desc->vdesc_name, ap->a_desc->vdesc_offset, vp)); 354 355 if (!ALLOPS(pmp)) { 356 switch (desc->vdesc_offset) { 357 CHECKOP_NOTSUPP(CREATE); 358 CHECKOP_NOTSUPP(MKNOD); 359 CHECKOP_NOTSUPP(GETATTR); 360 CHECKOP_NOTSUPP(SETATTR); 361 CHECKOP_NOTSUPP(READ); 362 CHECKOP_NOTSUPP(WRITE); 363 CHECKOP_NOTSUPP(FCNTL); 364 CHECKOP_NOTSUPP(IOCTL); 365 CHECKOP_NOTSUPP(REMOVE); 366 CHECKOP_NOTSUPP(LINK); 367 CHECKOP_NOTSUPP(RENAME); 368 CHECKOP_NOTSUPP(MKDIR); 369 CHECKOP_NOTSUPP(RMDIR); 370 CHECKOP_NOTSUPP(SYMLINK); 371 CHECKOP_NOTSUPP(READDIR); 372 CHECKOP_NOTSUPP(READLINK); 373 CHECKOP_NOTSUPP(PRINT); 374 CHECKOP_NOTSUPP(PATHCONF); 375 CHECKOP_NOTSUPP(ADVLOCK); 376 377 CHECKOP_SUCCESS(ACCESS); 378 CHECKOP_SUCCESS(CLOSE); 379 CHECKOP_SUCCESS(SEEK); 380 381 case VOP_GETPAGES_DESCOFFSET: 382 if (!EXISTSOP(pmp, READ)) 383 return genfs_eopnotsupp(v); 384 break; 385 386 default: 387 panic("puffs_checkop: unhandled vnop %d", 388 desc->vdesc_offset); 389 } 390 } 391 392 rv = VOCALL(puffs_msgop_p, ap->a_desc->vdesc_offset, v); 393 394 DPRINTF_VERBOSE(("checkop return %s (%d), vp %p: %d\n", 395 ap->a_desc->vdesc_name, ap->a_desc->vdesc_offset, vp, rv)); 396 397 return rv; 398 } 399 400 static int callremove(struct puffs_mount *, void *, void *, 401 struct componentname *); 402 static int callrmdir(struct puffs_mount *, void *, void *, 403 struct componentname *); 404 static void callinactive(struct puffs_mount *, void *, int); 405 static void callreclaim(struct puffs_mount *, void *); 406 407 #define PUFFS_ABORT_LOOKUP 1 408 #define PUFFS_ABORT_CREATE 2 409 #define PUFFS_ABORT_MKNOD 3 410 #define PUFFS_ABORT_MKDIR 4 411 #define PUFFS_ABORT_SYMLINK 5 412 413 /* 414 * Press the pani^Wabort button! Kernel resource allocation failed. 415 */ 416 static void 417 puffs_abortbutton(struct puffs_mount *pmp, int what, 418 void *dcookie, void *cookie, struct componentname *cnp) 419 { 420 421 switch (what) { 422 case PUFFS_ABORT_CREATE: 423 case PUFFS_ABORT_MKNOD: 424 case PUFFS_ABORT_SYMLINK: 425 callremove(pmp, dcookie, cookie, cnp); 426 break; 427 case PUFFS_ABORT_MKDIR: 428 callrmdir(pmp, dcookie, cookie, cnp); 429 break; 430 } 431 432 callinactive(pmp, cookie, 0); 433 callreclaim(pmp, cookie); 434 } 435 436 /* 437 * Begin vnode operations. 438 * 439 * A word from the keymaster about locks: generally we don't want 440 * to use the vnode locks at all: it creates an ugly dependency between 441 * the userlandia file server and the kernel. But we'll play along with 442 * the kernel vnode locks for now. However, even currently we attempt 443 * to release locks as early as possible. This is possible for some 444 * operations which a) don't need a locked vnode after the userspace op 445 * and b) return with the vnode unlocked. Theoretically we could 446 * unlock-do op-lock for others and order the graph in userspace, but I 447 * don't want to think of the consequences for the time being. 448 */ 449 450 int 451 puffs_vnop_lookup(void *v) 452 { 453 struct vop_lookup_args /* { 454 const struct vnodeop_desc *a_desc; 455 struct vnode *a_dvp; 456 struct vnode **a_vpp; 457 struct componentname *a_cnp; 458 } */ *ap = v; 459 PUFFS_MSG_VARS(vn, lookup); 460 struct puffs_mount *pmp; 461 struct componentname *cnp; 462 struct vnode *vp, *dvp; 463 struct puffs_node *dpn; 464 int isdot; 465 int error; 466 467 pmp = MPTOPUFFSMP(ap->a_dvp->v_mount); 468 cnp = ap->a_cnp; 469 dvp = ap->a_dvp; 470 *ap->a_vpp = NULL; 471 472 /* r/o fs? we check create later to handle EEXIST */ 473 if ((cnp->cn_flags & ISLASTCN) 474 && (dvp->v_mount->mnt_flag & MNT_RDONLY) 475 && (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 476 return EROFS; 477 478 isdot = cnp->cn_namelen == 1 && *cnp->cn_nameptr == '.'; 479 480 DPRINTF(("puffs_lookup: \"%s\", parent vnode %p, op: %x\n", 481 cnp->cn_nameptr, dvp, cnp->cn_nameiop)); 482 483 /* 484 * Check if someone fed it into the cache 485 */ 486 if (PUFFS_USE_NAMECACHE(pmp)) { 487 error = cache_lookup(dvp, ap->a_vpp, cnp); 488 489 if (error >= 0) 490 return error; 491 } 492 493 if (isdot) { 494 vp = ap->a_dvp; 495 vref(vp); 496 *ap->a_vpp = vp; 497 return 0; 498 } 499 500 PUFFS_MSG_ALLOC(vn, lookup); 501 puffs_makecn(&lookup_msg->pvnr_cn, &lookup_msg->pvnr_cn_cred, 502 cnp, PUFFS_USE_FULLPNBUF(pmp)); 503 504 if (cnp->cn_flags & ISDOTDOT) 505 VOP_UNLOCK(dvp, 0); 506 507 puffs_msg_setinfo(park_lookup, PUFFSOP_VN, 508 PUFFS_VN_LOOKUP, VPTOPNC(dvp)); 509 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_lookup, dvp->v_data, NULL, error); 510 DPRINTF(("puffs_lookup: return of the userspace, part %d\n", error)); 511 512 /* 513 * In case of error, there is no new vnode to play with, so be 514 * happy with the NULL value given to vpp in the beginning. 515 * Also, check if this really was an error or the target was not 516 * present. Either treat it as a non-error for CREATE/RENAME or 517 * enter the component into the negative name cache (if desired). 518 */ 519 if (error) { 520 error = checkerr(pmp, error, __func__); 521 if (error == ENOENT) { 522 /* don't allow to create files on r/o fs */ 523 if ((dvp->v_mount->mnt_flag & MNT_RDONLY) 524 && cnp->cn_nameiop == CREATE) { 525 error = EROFS; 526 527 /* adjust values if we are creating */ 528 } else if ((cnp->cn_flags & ISLASTCN) 529 && (cnp->cn_nameiop == CREATE 530 || cnp->cn_nameiop == RENAME)) { 531 cnp->cn_flags |= SAVENAME; 532 error = EJUSTRETURN; 533 534 /* save negative cache entry */ 535 } else { 536 if ((cnp->cn_flags & MAKEENTRY) 537 && PUFFS_USE_NAMECACHE(pmp)) 538 cache_enter(dvp, NULL, cnp); 539 } 540 } 541 goto out; 542 } 543 544 /* 545 * Check that we don't get our parent node back, that would cause 546 * a pretty obvious deadlock. 547 */ 548 dpn = dvp->v_data; 549 if (lookup_msg->pvnr_newnode == dpn->pn_cookie) { 550 puffs_senderr(pmp, PUFFS_ERR_LOOKUP, EINVAL, 551 "lookup produced parent cookie", lookup_msg->pvnr_newnode); 552 error = EPROTO; 553 goto out; 554 } 555 556 error = puffs_cookie2vnode(pmp, lookup_msg->pvnr_newnode, 1, 1, &vp); 557 if (error == PUFFS_NOSUCHCOOKIE) { 558 error = puffs_getvnode(dvp->v_mount, 559 lookup_msg->pvnr_newnode, lookup_msg->pvnr_vtype, 560 lookup_msg->pvnr_size, lookup_msg->pvnr_rdev, &vp); 561 if (error) { 562 puffs_abortbutton(pmp, PUFFS_ABORT_LOOKUP, VPTOPNC(dvp), 563 lookup_msg->pvnr_newnode, ap->a_cnp); 564 goto out; 565 } 566 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 567 } else if (error) { 568 puffs_abortbutton(pmp, PUFFS_ABORT_LOOKUP, VPTOPNC(dvp), 569 lookup_msg->pvnr_newnode, ap->a_cnp); 570 goto out; 571 } 572 573 *ap->a_vpp = vp; 574 575 if ((cnp->cn_flags & MAKEENTRY) != 0 && PUFFS_USE_NAMECACHE(pmp)) 576 cache_enter(dvp, vp, cnp); 577 578 /* XXX */ 579 if ((lookup_msg->pvnr_cn.pkcn_flags & REQUIREDIR) == 0) 580 cnp->cn_flags &= ~REQUIREDIR; 581 if (lookup_msg->pvnr_cn.pkcn_consume) 582 cnp->cn_consume = MIN(lookup_msg->pvnr_cn.pkcn_consume, 583 strlen(cnp->cn_nameptr) - cnp->cn_namelen); 584 585 out: 586 if (cnp->cn_flags & ISDOTDOT) 587 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 588 589 DPRINTF(("puffs_lookup: returning %d %p\n", error, *ap->a_vpp)); 590 PUFFS_MSG_RELEASE(lookup); 591 return error; 592 } 593 594 #define REFPN_AND_UNLOCKVP(a, b) \ 595 do { \ 596 mutex_enter(&b->pn_mtx); \ 597 puffs_referencenode(b); \ 598 mutex_exit(&b->pn_mtx); \ 599 VOP_UNLOCK(a, 0); \ 600 } while (/*CONSTCOND*/0) 601 602 #define REFPN(b) \ 603 do { \ 604 mutex_enter(&b->pn_mtx); \ 605 puffs_referencenode(b); \ 606 mutex_exit(&b->pn_mtx); \ 607 } while (/*CONSTCOND*/0) 608 609 #define RELEPN_AND_VP(a, b) \ 610 do { \ 611 puffs_releasenode(b); \ 612 vrele(a); \ 613 } while (/*CONSTCOND*/0) 614 615 int 616 puffs_vnop_create(void *v) 617 { 618 struct vop_create_args /* { 619 const struct vnodeop_desc *a_desc; 620 struct vnode *a_dvp; 621 struct vnode **a_vpp; 622 struct componentname *a_cnp; 623 struct vattr *a_vap; 624 } */ *ap = v; 625 PUFFS_MSG_VARS(vn, create); 626 struct vnode *dvp = ap->a_dvp; 627 struct puffs_node *dpn = VPTOPP(dvp); 628 struct componentname *cnp = ap->a_cnp; 629 struct mount *mp = dvp->v_mount; 630 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 631 int error; 632 633 DPRINTF(("puffs_create: dvp %p, cnp: %s\n", 634 dvp, ap->a_cnp->cn_nameptr)); 635 636 PUFFS_MSG_ALLOC(vn, create); 637 puffs_makecn(&create_msg->pvnr_cn, &create_msg->pvnr_cn_cred, 638 cnp, PUFFS_USE_FULLPNBUF(pmp)); 639 create_msg->pvnr_va = *ap->a_vap; 640 puffs_msg_setinfo(park_create, PUFFSOP_VN, 641 PUFFS_VN_CREATE, VPTOPNC(dvp)); 642 643 /* 644 * Do the dance: 645 * + insert into queue ("interlock") 646 * + unlock vnode 647 * + wait for response 648 */ 649 puffs_msg_enqueue(pmp, park_create); 650 REFPN_AND_UNLOCKVP(dvp, dpn); 651 error = puffs_msg_wait2(pmp, park_create, dpn, NULL); 652 653 error = checkerr(pmp, error, __func__); 654 if (error) 655 goto out; 656 657 error = puffs_newnode(mp, dvp, ap->a_vpp, 658 create_msg->pvnr_newnode, cnp, ap->a_vap->va_type, 0); 659 if (error) 660 puffs_abortbutton(pmp, PUFFS_ABORT_CREATE, dpn->pn_cookie, 661 create_msg->pvnr_newnode, cnp); 662 663 out: 664 if (error || (cnp->cn_flags & SAVESTART) == 0) 665 PNBUF_PUT(cnp->cn_pnbuf); 666 667 RELEPN_AND_VP(dvp, dpn); 668 DPRINTF(("puffs_create: return %d\n", error)); 669 PUFFS_MSG_RELEASE(create); 670 return error; 671 } 672 673 int 674 puffs_vnop_mknod(void *v) 675 { 676 struct vop_mknod_args /* { 677 const struct vnodeop_desc *a_desc; 678 struct vnode *a_dvp; 679 struct vnode **a_vpp; 680 struct componentname *a_cnp; 681 struct vattr *a_vap; 682 } */ *ap = v; 683 PUFFS_MSG_VARS(vn, mknod); 684 struct vnode *dvp = ap->a_dvp; 685 struct puffs_node *dpn = VPTOPP(dvp); 686 struct componentname *cnp = ap->a_cnp; 687 struct mount *mp = dvp->v_mount; 688 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 689 int error; 690 691 PUFFS_MSG_ALLOC(vn, mknod); 692 puffs_makecn(&mknod_msg->pvnr_cn, &mknod_msg->pvnr_cn_cred, 693 cnp, PUFFS_USE_FULLPNBUF(pmp)); 694 mknod_msg->pvnr_va = *ap->a_vap; 695 puffs_msg_setinfo(park_mknod, PUFFSOP_VN, 696 PUFFS_VN_MKNOD, VPTOPNC(dvp)); 697 698 puffs_msg_enqueue(pmp, park_mknod); 699 REFPN_AND_UNLOCKVP(dvp, dpn); 700 error = puffs_msg_wait2(pmp, park_mknod, dpn, NULL); 701 702 error = checkerr(pmp, error, __func__); 703 if (error) 704 goto out; 705 706 error = puffs_newnode(mp, dvp, ap->a_vpp, 707 mknod_msg->pvnr_newnode, cnp, ap->a_vap->va_type, 708 ap->a_vap->va_rdev); 709 if (error) 710 puffs_abortbutton(pmp, PUFFS_ABORT_MKNOD, dpn->pn_cookie, 711 mknod_msg->pvnr_newnode, cnp); 712 713 out: 714 PUFFS_MSG_RELEASE(mknod); 715 if (error || (cnp->cn_flags & SAVESTART) == 0) 716 PNBUF_PUT(cnp->cn_pnbuf); 717 RELEPN_AND_VP(dvp, dpn); 718 return error; 719 } 720 721 int 722 puffs_vnop_open(void *v) 723 { 724 struct vop_open_args /* { 725 const struct vnodeop_desc *a_desc; 726 struct vnode *a_vp; 727 int a_mode; 728 kauth_cred_t a_cred; 729 } */ *ap = v; 730 PUFFS_MSG_VARS(vn, open); 731 struct vnode *vp = ap->a_vp; 732 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 733 int mode = ap->a_mode; 734 int error; 735 736 DPRINTF(("puffs_open: vp %p, mode 0x%x\n", vp, mode)); 737 738 if (vp->v_type == VREG && mode & FWRITE && !EXISTSOP(pmp, WRITE)) 739 ERROUT(EROFS); 740 741 if (!EXISTSOP(pmp, OPEN)) 742 ERROUT(0); 743 744 PUFFS_MSG_ALLOC(vn, open); 745 open_msg->pvnr_mode = mode; 746 puffs_credcvt(&open_msg->pvnr_cred, ap->a_cred); 747 puffs_msg_setinfo(park_open, PUFFSOP_VN, 748 PUFFS_VN_OPEN, VPTOPNC(vp)); 749 750 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_open, vp->v_data, NULL, error); 751 error = checkerr(pmp, error, __func__); 752 753 out: 754 DPRINTF(("puffs_open: returning %d\n", error)); 755 PUFFS_MSG_RELEASE(open); 756 return error; 757 } 758 759 int 760 puffs_vnop_close(void *v) 761 { 762 struct vop_close_args /* { 763 const struct vnodeop_desc *a_desc; 764 struct vnode *a_vp; 765 int a_fflag; 766 kauth_cred_t a_cred; 767 } */ *ap = v; 768 PUFFS_MSG_VARS(vn, close); 769 struct vnode *vp = ap->a_vp; 770 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 771 772 PUFFS_MSG_ALLOC(vn, close); 773 puffs_msg_setfaf(park_close); 774 close_msg->pvnr_fflag = ap->a_fflag; 775 puffs_credcvt(&close_msg->pvnr_cred, ap->a_cred); 776 puffs_msg_setinfo(park_close, PUFFSOP_VN, 777 PUFFS_VN_CLOSE, VPTOPNC(vp)); 778 779 puffs_msg_enqueue(pmp, park_close); 780 PUFFS_MSG_RELEASE(close); 781 return 0; 782 } 783 784 int 785 puffs_vnop_access(void *v) 786 { 787 struct vop_access_args /* { 788 const struct vnodeop_desc *a_desc; 789 struct vnode *a_vp; 790 int a_mode; 791 kauth_cred_t a_cred; 792 } */ *ap = v; 793 PUFFS_MSG_VARS(vn, access); 794 struct vnode *vp = ap->a_vp; 795 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 796 int mode = ap->a_mode; 797 int error; 798 799 if (mode & VWRITE) { 800 switch (vp->v_type) { 801 case VDIR: 802 case VLNK: 803 case VREG: 804 if ((vp->v_mount->mnt_flag & MNT_RDONLY) 805 || !EXISTSOP(pmp, WRITE)) 806 return EROFS; 807 break; 808 default: 809 break; 810 } 811 } 812 813 if (!EXISTSOP(pmp, ACCESS)) 814 return 0; 815 816 PUFFS_MSG_ALLOC(vn, access); 817 access_msg->pvnr_mode = ap->a_mode; 818 puffs_credcvt(&access_msg->pvnr_cred, ap->a_cred); 819 puffs_msg_setinfo(park_access, PUFFSOP_VN, 820 PUFFS_VN_ACCESS, VPTOPNC(vp)); 821 822 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_access, vp->v_data, NULL, error); 823 error = checkerr(pmp, error, __func__); 824 PUFFS_MSG_RELEASE(access); 825 826 return error; 827 } 828 829 int 830 puffs_vnop_getattr(void *v) 831 { 832 struct vop_getattr_args /* { 833 const struct vnodeop_desc *a_desc; 834 struct vnode *a_vp; 835 struct vattr *a_vap; 836 kauth_cred_t a_cred; 837 } */ *ap = v; 838 PUFFS_MSG_VARS(vn, getattr); 839 struct vnode *vp = ap->a_vp; 840 struct mount *mp = vp->v_mount; 841 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 842 struct vattr *vap, *rvap; 843 struct puffs_node *pn; 844 int error = 0; 845 846 vap = ap->a_vap; 847 848 PUFFS_MSG_ALLOC(vn, getattr); 849 vattr_null(&getattr_msg->pvnr_va); 850 puffs_credcvt(&getattr_msg->pvnr_cred, ap->a_cred); 851 puffs_msg_setinfo(park_getattr, PUFFSOP_VN, 852 PUFFS_VN_GETATTR, VPTOPNC(vp)); 853 854 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_getattr, vp->v_data, NULL, error); 855 error = checkerr(pmp, error, __func__); 856 if (error) 857 goto out; 858 859 rvap = &getattr_msg->pvnr_va; 860 /* 861 * Don't listen to the file server regarding special device 862 * size info, the file server doesn't know anything about them. 863 */ 864 if (vp->v_type == VBLK || vp->v_type == VCHR) 865 rvap->va_size = vp->v_size; 866 867 /* Ditto for blocksize (ufs comment: this doesn't belong here) */ 868 if (vp->v_type == VBLK) 869 rvap->va_blocksize = BLKDEV_IOSIZE; 870 else if (vp->v_type == VCHR) 871 rvap->va_blocksize = MAXBSIZE; 872 873 (void) memcpy(vap, rvap, sizeof(struct vattr)); 874 vap->va_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 875 876 pn = VPTOPP(vp); 877 if (pn->pn_stat & PNODE_METACACHE_ATIME) 878 vap->va_atime = pn->pn_mc_atime; 879 if (pn->pn_stat & PNODE_METACACHE_CTIME) 880 vap->va_ctime = pn->pn_mc_ctime; 881 if (pn->pn_stat & PNODE_METACACHE_MTIME) 882 vap->va_mtime = pn->pn_mc_mtime; 883 if (pn->pn_stat & PNODE_METACACHE_SIZE) { 884 vap->va_size = pn->pn_mc_size; 885 } else { 886 if (rvap->va_size != VNOVAL 887 && vp->v_type != VBLK && vp->v_type != VCHR) { 888 uvm_vnp_setsize(vp, rvap->va_size); 889 pn->pn_serversize = rvap->va_size; 890 } 891 } 892 893 out: 894 PUFFS_MSG_RELEASE(getattr); 895 return error; 896 } 897 898 static int 899 dosetattr(struct vnode *vp, struct vattr *vap, kauth_cred_t cred, int chsize) 900 { 901 PUFFS_MSG_VARS(vn, setattr); 902 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 903 struct puffs_node *pn = vp->v_data; 904 int error; 905 906 if ((vp->v_mount->mnt_flag & MNT_RDONLY) && 907 (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL 908 || vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL 909 || vap->va_mode != (mode_t)VNOVAL)) 910 return EROFS; 911 912 if ((vp->v_mount->mnt_flag & MNT_RDONLY) 913 && vp->v_type == VREG && vap->va_size != VNOVAL) 914 return EROFS; 915 916 /* 917 * Flush metacache first. If we are called with some explicit 918 * parameters, treat them as information overriding metacache 919 * information. 920 */ 921 if (pn->pn_stat & PNODE_METACACHE_MASK) { 922 if ((pn->pn_stat & PNODE_METACACHE_ATIME) 923 && vap->va_atime.tv_sec == VNOVAL) 924 vap->va_atime = pn->pn_mc_atime; 925 if ((pn->pn_stat & PNODE_METACACHE_CTIME) 926 && vap->va_ctime.tv_sec == VNOVAL) 927 vap->va_ctime = pn->pn_mc_ctime; 928 if ((pn->pn_stat & PNODE_METACACHE_MTIME) 929 && vap->va_mtime.tv_sec == VNOVAL) 930 vap->va_mtime = pn->pn_mc_mtime; 931 if ((pn->pn_stat & PNODE_METACACHE_SIZE) 932 && vap->va_size == VNOVAL) 933 vap->va_size = pn->pn_mc_size; 934 935 pn->pn_stat &= ~PNODE_METACACHE_MASK; 936 } 937 938 PUFFS_MSG_ALLOC(vn, setattr); 939 (void)memcpy(&setattr_msg->pvnr_va, vap, sizeof(struct vattr)); 940 puffs_credcvt(&setattr_msg->pvnr_cred, cred); 941 puffs_msg_setinfo(park_setattr, PUFFSOP_VN, 942 PUFFS_VN_SETATTR, VPTOPNC(vp)); 943 944 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_setattr, vp->v_data, NULL, error); 945 PUFFS_MSG_RELEASE(setattr); 946 error = checkerr(pmp, error, __func__); 947 if (error) 948 return error; 949 950 if (vap->va_size != VNOVAL) { 951 pn->pn_serversize = vap->va_size; 952 if (chsize) 953 uvm_vnp_setsize(vp, vap->va_size); 954 } 955 956 return 0; 957 } 958 959 int 960 puffs_vnop_setattr(void *v) 961 { 962 struct vop_getattr_args /* { 963 const struct vnodeop_desc *a_desc; 964 struct vnode *a_vp; 965 struct vattr *a_vap; 966 kauth_cred_t a_cred; 967 } */ *ap = v; 968 969 return dosetattr(ap->a_vp, ap->a_vap, ap->a_cred, 1); 970 } 971 972 static __inline int 973 doinact(struct puffs_mount *pmp, int iaflag) 974 { 975 976 if (EXISTSOP(pmp, INACTIVE)) 977 if (pmp->pmp_flags & PUFFS_KFLAG_IAONDEMAND) 978 if (iaflag || ALLOPS(pmp)) 979 return 1; 980 else 981 return 0; 982 else 983 return 1; 984 else 985 return 0; 986 } 987 988 static void 989 callinactive(struct puffs_mount *pmp, void *cookie, int iaflag) 990 { 991 int error; 992 PUFFS_MSG_VARS(vn, inactive); 993 994 if (doinact(pmp, iaflag)) { 995 PUFFS_MSG_ALLOC(vn, inactive); 996 puffs_msg_setinfo(park_inactive, PUFFSOP_VN, 997 PUFFS_VN_INACTIVE, cookie); 998 999 PUFFS_MSG_ENQUEUEWAIT(pmp, park_inactive, error); 1000 PUFFS_MSG_RELEASE(inactive); 1001 } 1002 } 1003 1004 /* XXX: callinactive can't setback */ 1005 int 1006 puffs_vnop_inactive(void *v) 1007 { 1008 struct vop_inactive_args /* { 1009 const struct vnodeop_desc *a_desc; 1010 struct vnode *a_vp; 1011 } */ *ap = v; 1012 PUFFS_MSG_VARS(vn, inactive); 1013 struct vnode *vp = ap->a_vp; 1014 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1015 struct puffs_node *pnode; 1016 int error; 1017 1018 pnode = vp->v_data; 1019 1020 if (doinact(pmp, pnode->pn_stat & PNODE_DOINACT)) { 1021 PUFFS_MSG_ALLOC(vn, inactive); 1022 puffs_msg_setinfo(park_inactive, PUFFSOP_VN, 1023 PUFFS_VN_INACTIVE, VPTOPNC(vp)); 1024 1025 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_inactive, vp->v_data, 1026 NULL, error); 1027 PUFFS_MSG_RELEASE(inactive); 1028 } 1029 pnode->pn_stat &= ~PNODE_DOINACT; 1030 1031 VOP_UNLOCK(vp, 0); 1032 1033 /* 1034 * file server thinks it's gone? then don't be afraid care, 1035 * node's life was already all it would ever be 1036 */ 1037 if (pnode->pn_stat & PNODE_NOREFS) { 1038 pnode->pn_stat |= PNODE_DYING; 1039 vrecycle(vp, NULL, curlwp); 1040 } 1041 1042 return 0; 1043 } 1044 1045 static void 1046 callreclaim(struct puffs_mount *pmp, void *cookie) 1047 { 1048 PUFFS_MSG_VARS(vn, reclaim); 1049 1050 if (!EXISTSOP(pmp, RECLAIM)) 1051 return; 1052 1053 PUFFS_MSG_ALLOC(vn, reclaim); 1054 puffs_msg_setfaf(park_reclaim); 1055 puffs_msg_setinfo(park_reclaim, PUFFSOP_VN, PUFFS_VN_RECLAIM, cookie); 1056 1057 puffs_msg_enqueue(pmp, park_reclaim); 1058 PUFFS_MSG_RELEASE(reclaim); 1059 } 1060 1061 /* 1062 * always FAF, we don't really care if the server wants to fail to 1063 * reclaim the node or not 1064 */ 1065 int 1066 puffs_vnop_reclaim(void *v) 1067 { 1068 struct vop_reclaim_args /* { 1069 const struct vnodeop_desc *a_desc; 1070 struct vnode *a_vp; 1071 } */ *ap = v; 1072 struct vnode *vp = ap->a_vp; 1073 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1074 1075 /* 1076 * first things first: check if someone is trying to reclaim the 1077 * root vnode. do not allow that to travel to userspace. 1078 * Note that we don't need to take the lock similarly to 1079 * puffs_root(), since there is only one of us. 1080 */ 1081 if (vp->v_vflag & VV_ROOT) { 1082 mutex_enter(&pmp->pmp_lock); 1083 KASSERT(pmp->pmp_root != NULL); 1084 pmp->pmp_root = NULL; 1085 mutex_exit(&pmp->pmp_lock); 1086 goto out; 1087 } 1088 1089 callreclaim(MPTOPUFFSMP(vp->v_mount), VPTOPNC(vp)); 1090 1091 out: 1092 if (PUFFS_USE_NAMECACHE(pmp)) 1093 cache_purge(vp); 1094 puffs_putvnode(vp); 1095 1096 return 0; 1097 } 1098 1099 #define CSIZE sizeof(**ap->a_cookies) 1100 int 1101 puffs_vnop_readdir(void *v) 1102 { 1103 struct vop_readdir_args /* { 1104 const struct vnodeop_desc *a_desc; 1105 struct vnode *a_vp; 1106 struct uio *a_uio; 1107 kauth_cred_t a_cred; 1108 int *a_eofflag; 1109 off_t **a_cookies; 1110 int *a_ncookies; 1111 } */ *ap = v; 1112 PUFFS_MSG_VARS(vn, readdir); 1113 struct vnode *vp = ap->a_vp; 1114 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1115 size_t argsize, tomove, cookiemem, cookiesmax; 1116 struct uio *uio = ap->a_uio; 1117 size_t howmuch, resid; 1118 int error; 1119 1120 /* 1121 * ok, so we need: resid + cookiemem = maxreq 1122 * => resid + cookiesize * (resid/minsize) = maxreq 1123 * => resid + cookiesize/minsize * resid = maxreq 1124 * => (cookiesize/minsize + 1) * resid = maxreq 1125 * => resid = maxreq / (cookiesize/minsize + 1) 1126 * 1127 * Since cookiesize <= minsize and we're not very big on floats, 1128 * we approximate that to be 1. Therefore: 1129 * 1130 * resid = maxreq / 2; 1131 * 1132 * Well, at least we didn't have to use differential equations 1133 * or the Gram-Schmidt process. 1134 * 1135 * (yes, I'm very afraid of this) 1136 */ 1137 KASSERT(CSIZE <= _DIRENT_MINSIZE((struct dirent *)0)); 1138 1139 if (ap->a_cookies) { 1140 KASSERT(ap->a_ncookies != NULL); 1141 if (pmp->pmp_args.pa_fhsize == 0) 1142 return EOPNOTSUPP; 1143 resid = PUFFS_TOMOVE(uio->uio_resid, pmp) / 2; 1144 cookiesmax = resid/_DIRENT_MINSIZE((struct dirent *)0); 1145 cookiemem = ALIGN(cookiesmax*CSIZE); /* play safe */ 1146 } else { 1147 resid = PUFFS_TOMOVE(uio->uio_resid, pmp); 1148 cookiesmax = 0; 1149 cookiemem = 0; 1150 } 1151 1152 argsize = sizeof(struct puffs_vnmsg_readdir); 1153 tomove = resid + cookiemem; 1154 puffs_msgmem_alloc(argsize + tomove, &park_readdir, 1155 (void **)&readdir_msg, 1); 1156 1157 puffs_credcvt(&readdir_msg->pvnr_cred, ap->a_cred); 1158 readdir_msg->pvnr_offset = uio->uio_offset; 1159 readdir_msg->pvnr_resid = resid; 1160 readdir_msg->pvnr_ncookies = cookiesmax; 1161 readdir_msg->pvnr_eofflag = 0; 1162 readdir_msg->pvnr_dentoff = cookiemem; 1163 puffs_msg_setinfo(park_readdir, PUFFSOP_VN, 1164 PUFFS_VN_READDIR, VPTOPNC(vp)); 1165 puffs_msg_setdelta(park_readdir, tomove); 1166 1167 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_readdir, vp->v_data, NULL, error); 1168 error = checkerr(pmp, error, __func__); 1169 if (error) 1170 goto out; 1171 1172 /* userspace is cheating? */ 1173 if (readdir_msg->pvnr_resid > resid) { 1174 puffs_senderr(pmp, PUFFS_ERR_READDIR, E2BIG, 1175 "resid grew", VPTOPNC(vp)); 1176 ERROUT(EPROTO); 1177 } 1178 if (readdir_msg->pvnr_ncookies > cookiesmax) { 1179 puffs_senderr(pmp, PUFFS_ERR_READDIR, E2BIG, 1180 "too many cookies", VPTOPNC(vp)); 1181 ERROUT(EPROTO); 1182 } 1183 1184 /* check eof */ 1185 if (readdir_msg->pvnr_eofflag) 1186 *ap->a_eofflag = 1; 1187 1188 /* bouncy-wouncy with the directory data */ 1189 howmuch = resid - readdir_msg->pvnr_resid; 1190 1191 /* force eof if no data was returned (getcwd() needs this) */ 1192 if (howmuch == 0) { 1193 *ap->a_eofflag = 1; 1194 goto out; 1195 } 1196 1197 error = uiomove(readdir_msg->pvnr_data + cookiemem, howmuch, uio); 1198 if (error) 1199 goto out; 1200 1201 /* provide cookies to caller if so desired */ 1202 if (ap->a_cookies) { 1203 *ap->a_cookies = malloc(readdir_msg->pvnr_ncookies*CSIZE, 1204 M_TEMP, M_WAITOK); 1205 *ap->a_ncookies = readdir_msg->pvnr_ncookies; 1206 memcpy(*ap->a_cookies, readdir_msg->pvnr_data, 1207 *ap->a_ncookies*CSIZE); 1208 } 1209 1210 /* next readdir starts here */ 1211 uio->uio_offset = readdir_msg->pvnr_offset; 1212 1213 out: 1214 puffs_msgmem_release(park_readdir); 1215 return error; 1216 } 1217 #undef CSIZE 1218 1219 /* 1220 * poll works by consuming the bitmask in pn_revents. If there are 1221 * events available, poll returns immediately. If not, it issues a 1222 * poll to userspace, selrecords itself and returns with no available 1223 * events. When the file server returns, it executes puffs_parkdone_poll(), 1224 * where available events are added to the bitmask. selnotify() is 1225 * then also executed by that function causing us to enter here again 1226 * and hopefully find the missing bits (unless someone got them first, 1227 * in which case it starts all over again). 1228 */ 1229 int 1230 puffs_vnop_poll(void *v) 1231 { 1232 struct vop_poll_args /* { 1233 const struct vnodeop_desc *a_desc; 1234 struct vnode *a_vp; 1235 int a_events; 1236 }*/ *ap = v; 1237 PUFFS_MSG_VARS(vn, poll); 1238 struct vnode *vp = ap->a_vp; 1239 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1240 struct puffs_node *pn = vp->v_data; 1241 int events, error; 1242 1243 if (EXISTSOP(pmp, POLL)) { 1244 mutex_enter(&pn->pn_mtx); 1245 events = pn->pn_revents & ap->a_events; 1246 if (events & ap->a_events) { 1247 pn->pn_revents &= ~ap->a_events; 1248 mutex_exit(&pn->pn_mtx); 1249 1250 return events; 1251 } else { 1252 puffs_referencenode(pn); 1253 mutex_exit(&pn->pn_mtx); 1254 1255 PUFFS_MSG_ALLOC(vn, poll); 1256 poll_msg->pvnr_events = ap->a_events; 1257 puffs_msg_setinfo(park_poll, PUFFSOP_VN, 1258 PUFFS_VN_POLL, VPTOPNC(vp)); 1259 puffs_msg_setcall(park_poll, puffs_parkdone_poll, pn); 1260 selrecord(curlwp, &pn->pn_sel); 1261 1262 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_poll, vp->v_data, 1263 NULL, error); 1264 PUFFS_MSG_RELEASE(poll); 1265 1266 return 0; 1267 } 1268 } else { 1269 return genfs_poll(v); 1270 } 1271 } 1272 1273 int 1274 puffs_vnop_fsync(void *v) 1275 { 1276 struct vop_fsync_args /* { 1277 const struct vnodeop_desc *a_desc; 1278 struct vnode *a_vp; 1279 kauth_cred_t a_cred; 1280 int a_flags; 1281 off_t a_offlo; 1282 off_t a_offhi; 1283 } */ *ap = v; 1284 PUFFS_MSG_VARS(vn, fsync); 1285 struct vnode *vp = ap->a_vp; 1286 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1287 struct puffs_node *pn; 1288 struct vattr va; 1289 int pflags, error, dofaf; 1290 1291 pn = VPTOPP(vp); 1292 1293 /* flush out information from our metacache, see vop_setattr */ 1294 if (pn->pn_stat & PNODE_METACACHE_MASK 1295 && (pn->pn_stat & PNODE_DYING) == 0) { 1296 vattr_null(&va); 1297 error = VOP_SETATTR(vp, &va, FSCRED); 1298 if (error) 1299 return error; 1300 } 1301 1302 /* 1303 * flush pages to avoid being overly dirty 1304 */ 1305 pflags = PGO_CLEANIT; 1306 if (ap->a_flags & FSYNC_WAIT) 1307 pflags |= PGO_SYNCIO; 1308 simple_lock(&vp->v_interlock); 1309 error = VOP_PUTPAGES(vp, trunc_page(ap->a_offlo), 1310 round_page(ap->a_offhi), pflags); 1311 if (error) 1312 return error; 1313 1314 /* 1315 * HELLO! We exit already here if the user server does not 1316 * support fsync OR if we should call fsync for a node which 1317 * has references neither in the kernel or the fs server. 1318 * Otherwise we continue to issue fsync() forward. 1319 */ 1320 if (!EXISTSOP(pmp, FSYNC) || (pn->pn_stat & PNODE_DYING)) 1321 return 0; 1322 1323 dofaf = (ap->a_flags & FSYNC_WAIT) == 0 || ap->a_flags == FSYNC_LAZY; 1324 /* 1325 * We abuse VXLOCK to mean "vnode is going to die", so we issue 1326 * only FAFs for those. Otherwise there's a danger of deadlock, 1327 * since the execution context here might be the user server 1328 * doing some operation on another fs, which in turn caused a 1329 * vnode to be reclaimed from the freelist for this fs. 1330 */ 1331 if (dofaf == 0) { 1332 simple_lock(&vp->v_interlock); 1333 if (vp->v_iflag & VI_XLOCK) 1334 dofaf = 1; 1335 simple_unlock(&vp->v_interlock); 1336 } 1337 1338 PUFFS_MSG_ALLOC(vn, fsync); 1339 if (dofaf) 1340 puffs_msg_setfaf(park_fsync); 1341 1342 puffs_credcvt(&fsync_msg->pvnr_cred, ap->a_cred); 1343 fsync_msg->pvnr_flags = ap->a_flags; 1344 fsync_msg->pvnr_offlo = ap->a_offlo; 1345 fsync_msg->pvnr_offhi = ap->a_offhi; 1346 puffs_msg_setinfo(park_fsync, PUFFSOP_VN, 1347 PUFFS_VN_FSYNC, VPTOPNC(vp)); 1348 1349 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_fsync, vp->v_data, NULL, error); 1350 PUFFS_MSG_RELEASE(fsync); 1351 1352 error = checkerr(pmp, error, __func__); 1353 1354 return error; 1355 } 1356 1357 int 1358 puffs_vnop_seek(void *v) 1359 { 1360 struct vop_seek_args /* { 1361 const struct vnodeop_desc *a_desc; 1362 struct vnode *a_vp; 1363 off_t a_oldoff; 1364 off_t a_newoff; 1365 kauth_cred_t a_cred; 1366 } */ *ap = v; 1367 PUFFS_MSG_VARS(vn, seek); 1368 struct vnode *vp = ap->a_vp; 1369 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1370 int error; 1371 1372 PUFFS_MSG_ALLOC(vn, seek); 1373 seek_msg->pvnr_oldoff = ap->a_oldoff; 1374 seek_msg->pvnr_newoff = ap->a_newoff; 1375 puffs_credcvt(&seek_msg->pvnr_cred, ap->a_cred); 1376 puffs_msg_setinfo(park_seek, PUFFSOP_VN, 1377 PUFFS_VN_SEEK, VPTOPNC(vp)); 1378 1379 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_seek, vp->v_data, NULL, error); 1380 PUFFS_MSG_RELEASE(seek); 1381 return checkerr(pmp, error, __func__); 1382 } 1383 1384 static int 1385 callremove(struct puffs_mount *pmp, void *dcookie, void *cookie, 1386 struct componentname *cnp) 1387 { 1388 PUFFS_MSG_VARS(vn, remove); 1389 int error; 1390 1391 PUFFS_MSG_ALLOC(vn, remove); 1392 remove_msg->pvnr_cookie_targ = cookie; 1393 puffs_makecn(&remove_msg->pvnr_cn, &remove_msg->pvnr_cn_cred, 1394 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1395 puffs_msg_setinfo(park_remove, PUFFSOP_VN, PUFFS_VN_REMOVE, dcookie); 1396 1397 PUFFS_MSG_ENQUEUEWAIT(pmp, park_remove, error); 1398 PUFFS_MSG_RELEASE(remove); 1399 1400 return checkerr(pmp, error, __func__); 1401 } 1402 1403 /* 1404 * XXX: can't use callremove now because can't catch setbacks with 1405 * it due to lack of a pnode argument. 1406 */ 1407 int 1408 puffs_vnop_remove(void *v) 1409 { 1410 struct vop_remove_args /* { 1411 const struct vnodeop_desc *a_desc; 1412 struct vnode *a_dvp; 1413 struct vnode *a_vp; 1414 struct componentname *a_cnp; 1415 } */ *ap = v; 1416 PUFFS_MSG_VARS(vn, remove); 1417 struct vnode *dvp = ap->a_dvp; 1418 struct vnode *vp = ap->a_vp; 1419 struct puffs_node *dpn = VPTOPP(dvp); 1420 struct puffs_node *pn = VPTOPP(vp); 1421 struct componentname *cnp = ap->a_cnp; 1422 struct mount *mp = dvp->v_mount; 1423 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 1424 int error; 1425 1426 PUFFS_MSG_ALLOC(vn, remove); 1427 remove_msg->pvnr_cookie_targ = VPTOPNC(vp); 1428 puffs_makecn(&remove_msg->pvnr_cn, &remove_msg->pvnr_cn_cred, 1429 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1430 puffs_msg_setinfo(park_remove, PUFFSOP_VN, 1431 PUFFS_VN_REMOVE, VPTOPNC(dvp)); 1432 1433 puffs_msg_enqueue(pmp, park_remove); 1434 REFPN_AND_UNLOCKVP(dvp, dpn); 1435 if (dvp == vp) 1436 REFPN(pn); 1437 else 1438 REFPN_AND_UNLOCKVP(vp, pn); 1439 error = puffs_msg_wait2(pmp, park_remove, dpn, pn); 1440 1441 PUFFS_MSG_RELEASE(remove); 1442 1443 RELEPN_AND_VP(dvp, dpn); 1444 RELEPN_AND_VP(vp, pn); 1445 1446 error = checkerr(pmp, error, __func__); 1447 return error; 1448 } 1449 1450 int 1451 puffs_vnop_mkdir(void *v) 1452 { 1453 struct vop_mkdir_args /* { 1454 const struct vnodeop_desc *a_desc; 1455 struct vnode *a_dvp; 1456 struct vnode **a_vpp; 1457 struct componentname *a_cnp; 1458 struct vattr *a_vap; 1459 } */ *ap = v; 1460 PUFFS_MSG_VARS(vn, mkdir); 1461 struct vnode *dvp = ap->a_dvp; 1462 struct puffs_node *dpn = VPTOPP(dvp); 1463 struct componentname *cnp = ap->a_cnp; 1464 struct mount *mp = dvp->v_mount; 1465 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 1466 int error; 1467 1468 PUFFS_MSG_ALLOC(vn, mkdir); 1469 puffs_makecn(&mkdir_msg->pvnr_cn, &mkdir_msg->pvnr_cn_cred, 1470 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1471 mkdir_msg->pvnr_va = *ap->a_vap; 1472 puffs_msg_setinfo(park_mkdir, PUFFSOP_VN, 1473 PUFFS_VN_MKDIR, VPTOPNC(dvp)); 1474 1475 puffs_msg_enqueue(pmp, park_mkdir); 1476 REFPN_AND_UNLOCKVP(dvp, dpn); 1477 error = puffs_msg_wait2(pmp, park_mkdir, dpn, NULL); 1478 1479 error = checkerr(pmp, error, __func__); 1480 if (error) 1481 goto out; 1482 1483 error = puffs_newnode(mp, dvp, ap->a_vpp, 1484 mkdir_msg->pvnr_newnode, cnp, VDIR, 0); 1485 if (error) 1486 puffs_abortbutton(pmp, PUFFS_ABORT_MKDIR, dpn->pn_cookie, 1487 mkdir_msg->pvnr_newnode, cnp); 1488 1489 out: 1490 PUFFS_MSG_RELEASE(mkdir); 1491 if (error || (cnp->cn_flags & SAVESTART) == 0) 1492 PNBUF_PUT(cnp->cn_pnbuf); 1493 RELEPN_AND_VP(dvp, dpn); 1494 return error; 1495 } 1496 1497 static int 1498 callrmdir(struct puffs_mount *pmp, void *dcookie, void *cookie, 1499 struct componentname *cnp) 1500 { 1501 PUFFS_MSG_VARS(vn, rmdir); 1502 int error; 1503 1504 PUFFS_MSG_ALLOC(vn, rmdir); 1505 rmdir_msg->pvnr_cookie_targ = cookie; 1506 puffs_makecn(&rmdir_msg->pvnr_cn, &rmdir_msg->pvnr_cn_cred, 1507 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1508 puffs_msg_setinfo(park_rmdir, PUFFSOP_VN, PUFFS_VN_RMDIR, dcookie); 1509 1510 PUFFS_MSG_ENQUEUEWAIT(pmp, park_rmdir, error); 1511 PUFFS_MSG_RELEASE(rmdir); 1512 1513 return checkerr(pmp, error, __func__); 1514 } 1515 1516 int 1517 puffs_vnop_rmdir(void *v) 1518 { 1519 struct vop_rmdir_args /* { 1520 const struct vnodeop_desc *a_desc; 1521 struct vnode *a_dvp; 1522 struct vnode *a_vp; 1523 struct componentname *a_cnp; 1524 } */ *ap = v; 1525 PUFFS_MSG_VARS(vn, rmdir); 1526 struct vnode *dvp = ap->a_dvp; 1527 struct vnode *vp = ap->a_vp; 1528 struct puffs_node *dpn = VPTOPP(dvp); 1529 struct puffs_node *pn = VPTOPP(vp); 1530 struct puffs_mount *pmp = MPTOPUFFSMP(dvp->v_mount); 1531 struct componentname *cnp = ap->a_cnp; 1532 int error; 1533 1534 PUFFS_MSG_ALLOC(vn, rmdir); 1535 rmdir_msg->pvnr_cookie_targ = VPTOPNC(vp); 1536 puffs_makecn(&rmdir_msg->pvnr_cn, &rmdir_msg->pvnr_cn_cred, 1537 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1538 puffs_msg_setinfo(park_rmdir, PUFFSOP_VN, 1539 PUFFS_VN_RMDIR, VPTOPNC(dvp)); 1540 1541 puffs_msg_enqueue(pmp, park_rmdir); 1542 REFPN_AND_UNLOCKVP(dvp, dpn); 1543 REFPN_AND_UNLOCKVP(vp, pn); 1544 error = puffs_msg_wait2(pmp, park_rmdir, dpn, pn); 1545 1546 PUFFS_MSG_RELEASE(rmdir); 1547 1548 /* XXX: some call cache_purge() *for both vnodes* here, investigate */ 1549 RELEPN_AND_VP(dvp, dpn); 1550 RELEPN_AND_VP(vp, pn); 1551 1552 return error; 1553 } 1554 1555 int 1556 puffs_vnop_link(void *v) 1557 { 1558 struct vop_link_args /* { 1559 const struct vnodeop_desc *a_desc; 1560 struct vnode *a_dvp; 1561 struct vnode *a_vp; 1562 struct componentname *a_cnp; 1563 }*/ *ap = v; 1564 PUFFS_MSG_VARS(vn, link); 1565 struct vnode *dvp = ap->a_dvp; 1566 struct vnode *vp = ap->a_vp; 1567 struct puffs_node *dpn = VPTOPP(dvp); 1568 struct puffs_node *pn = VPTOPP(vp); 1569 struct puffs_mount *pmp = MPTOPUFFSMP(dvp->v_mount); 1570 struct componentname *cnp = ap->a_cnp; 1571 int error; 1572 1573 PUFFS_MSG_ALLOC(vn, link); 1574 link_msg->pvnr_cookie_targ = VPTOPNC(vp); 1575 puffs_makecn(&link_msg->pvnr_cn, &link_msg->pvnr_cn_cred, 1576 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1577 puffs_msg_setinfo(park_link, PUFFSOP_VN, 1578 PUFFS_VN_LINK, VPTOPNC(dvp)); 1579 1580 puffs_msg_enqueue(pmp, park_link); 1581 REFPN_AND_UNLOCKVP(dvp, dpn); 1582 REFPN(pn); 1583 error = puffs_msg_wait2(pmp, park_link, dpn, pn); 1584 1585 PUFFS_MSG_RELEASE(link); 1586 1587 error = checkerr(pmp, error, __func__); 1588 1589 /* 1590 * XXX: stay in touch with the cache. I don't like this, but 1591 * don't have a better solution either. See also puffs_rename(). 1592 */ 1593 if (error == 0) 1594 puffs_updatenode(pn, PUFFS_UPDATECTIME, 0); 1595 1596 PNBUF_PUT(cnp->cn_pnbuf); 1597 RELEPN_AND_VP(dvp, dpn); 1598 puffs_releasenode(pn); 1599 1600 return error; 1601 } 1602 1603 int 1604 puffs_vnop_symlink(void *v) 1605 { 1606 struct vop_symlink_args /* { 1607 const struct vnodeop_desc *a_desc; 1608 struct vnode *a_dvp; 1609 struct vnode **a_vpp; 1610 struct componentname *a_cnp; 1611 struct vattr *a_vap; 1612 char *a_target; 1613 }*/ *ap = v; 1614 PUFFS_MSG_VARS(vn, symlink); 1615 struct vnode *dvp = ap->a_dvp; 1616 struct puffs_node *dpn = VPTOPP(dvp); 1617 struct mount *mp = dvp->v_mount; 1618 struct puffs_mount *pmp = MPTOPUFFSMP(dvp->v_mount); 1619 struct componentname *cnp = ap->a_cnp; 1620 int error; 1621 1622 *ap->a_vpp = NULL; 1623 1624 PUFFS_MSG_ALLOC(vn, symlink); 1625 puffs_makecn(&symlink_msg->pvnr_cn, &symlink_msg->pvnr_cn_cred, 1626 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1627 symlink_msg->pvnr_va = *ap->a_vap; 1628 (void)strlcpy(symlink_msg->pvnr_link, ap->a_target, 1629 sizeof(symlink_msg->pvnr_link)); 1630 puffs_msg_setinfo(park_symlink, PUFFSOP_VN, 1631 PUFFS_VN_SYMLINK, VPTOPNC(dvp)); 1632 1633 puffs_msg_enqueue(pmp, park_symlink); 1634 REFPN_AND_UNLOCKVP(dvp, dpn); 1635 error = puffs_msg_wait2(pmp, park_symlink, dpn, NULL); 1636 1637 error = checkerr(pmp, error, __func__); 1638 if (error) 1639 goto out; 1640 1641 error = puffs_newnode(mp, dvp, ap->a_vpp, 1642 symlink_msg->pvnr_newnode, cnp, VLNK, 0); 1643 if (error) 1644 puffs_abortbutton(pmp, PUFFS_ABORT_SYMLINK, dpn->pn_cookie, 1645 symlink_msg->pvnr_newnode, cnp); 1646 1647 out: 1648 PUFFS_MSG_RELEASE(symlink); 1649 if (error || (cnp->cn_flags & SAVESTART) == 0) 1650 PNBUF_PUT(cnp->cn_pnbuf); 1651 RELEPN_AND_VP(dvp, dpn); 1652 1653 return error; 1654 } 1655 1656 int 1657 puffs_vnop_readlink(void *v) 1658 { 1659 struct vop_readlink_args /* { 1660 const struct vnodeop_desc *a_desc; 1661 struct vnode *a_vp; 1662 struct uio *a_uio; 1663 kauth_cred_t a_cred; 1664 } */ *ap = v; 1665 PUFFS_MSG_VARS(vn, readlink); 1666 struct vnode *vp = ap->a_vp; 1667 struct puffs_mount *pmp = MPTOPUFFSMP(ap->a_vp->v_mount); 1668 size_t linklen; 1669 int error; 1670 1671 PUFFS_MSG_ALLOC(vn, readlink); 1672 puffs_credcvt(&readlink_msg->pvnr_cred, ap->a_cred); 1673 linklen = sizeof(readlink_msg->pvnr_link); 1674 readlink_msg->pvnr_linklen = linklen; 1675 puffs_msg_setinfo(park_readlink, PUFFSOP_VN, 1676 PUFFS_VN_READLINK, VPTOPNC(vp)); 1677 1678 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_readlink, vp->v_data, NULL, error); 1679 error = checkerr(pmp, error, __func__); 1680 if (error) 1681 goto out; 1682 1683 /* bad bad user file server */ 1684 if (readlink_msg->pvnr_linklen > linklen) { 1685 puffs_senderr(pmp, PUFFS_ERR_READLINK, E2BIG, 1686 "linklen too big", VPTOPNC(ap->a_vp)); 1687 error = EPROTO; 1688 goto out; 1689 } 1690 1691 error = uiomove(&readlink_msg->pvnr_link, readlink_msg->pvnr_linklen, 1692 ap->a_uio); 1693 out: 1694 PUFFS_MSG_RELEASE(readlink); 1695 return error; 1696 } 1697 1698 int 1699 puffs_vnop_rename(void *v) 1700 { 1701 struct vop_rename_args /* { 1702 const struct vnodeop_desc *a_desc; 1703 struct vnode *a_fdvp; 1704 struct vnode *a_fvp; 1705 struct componentname *a_fcnp; 1706 struct vnode *a_tdvp; 1707 struct vnode *a_tvp; 1708 struct componentname *a_tcnp; 1709 }*/ *ap = v; 1710 PUFFS_MSG_VARS(vn, rename); 1711 struct vnode *fdvp = ap->a_fdvp; 1712 struct puffs_node *fpn = ap->a_fvp->v_data; 1713 struct puffs_mount *pmp = MPTOPUFFSMP(fdvp->v_mount); 1714 int error; 1715 1716 if (ap->a_fvp->v_mount != ap->a_tdvp->v_mount) 1717 ERROUT(EXDEV); 1718 1719 PUFFS_MSG_ALLOC(vn, rename); 1720 rename_msg->pvnr_cookie_src = VPTOPNC(ap->a_fvp); 1721 rename_msg->pvnr_cookie_targdir = VPTOPNC(ap->a_tdvp); 1722 if (ap->a_tvp) 1723 rename_msg->pvnr_cookie_targ = VPTOPNC(ap->a_tvp); 1724 else 1725 rename_msg->pvnr_cookie_targ = NULL; 1726 puffs_makecn(&rename_msg->pvnr_cn_src, &rename_msg->pvnr_cn_src_cred, 1727 ap->a_fcnp, PUFFS_USE_FULLPNBUF(pmp)); 1728 puffs_makecn(&rename_msg->pvnr_cn_targ, &rename_msg->pvnr_cn_targ_cred, 1729 ap->a_tcnp, PUFFS_USE_FULLPNBUF(pmp)); 1730 puffs_msg_setinfo(park_rename, PUFFSOP_VN, 1731 PUFFS_VN_RENAME, VPTOPNC(fdvp)); 1732 1733 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_rename, fdvp->v_data, NULL, error); 1734 error = checkerr(pmp, error, __func__); 1735 1736 /* 1737 * XXX: stay in touch with the cache. I don't like this, but 1738 * don't have a better solution either. See also puffs_link(). 1739 */ 1740 if (error == 0) 1741 puffs_updatenode(fpn, PUFFS_UPDATECTIME, 0); 1742 1743 out: 1744 PUFFS_MSG_RELEASE(rename); 1745 if (ap->a_tvp != NULL) 1746 vput(ap->a_tvp); 1747 if (ap->a_tdvp == ap->a_tvp) 1748 vrele(ap->a_tdvp); 1749 else 1750 vput(ap->a_tdvp); 1751 1752 vrele(ap->a_fdvp); 1753 vrele(ap->a_fvp); 1754 1755 return error; 1756 } 1757 1758 #define RWARGS(cont, iofl, move, offset, creds) \ 1759 (cont)->pvnr_ioflag = (iofl); \ 1760 (cont)->pvnr_resid = (move); \ 1761 (cont)->pvnr_offset = (offset); \ 1762 puffs_credcvt(&(cont)->pvnr_cred, creds) 1763 1764 int 1765 puffs_vnop_read(void *v) 1766 { 1767 struct vop_read_args /* { 1768 const struct vnodeop_desc *a_desc; 1769 struct vnode *a_vp; 1770 struct uio *a_uio; 1771 int a_ioflag; 1772 kauth_cred_t a_cred; 1773 } */ *ap = v; 1774 PUFFS_MSG_VARS(vn, read); 1775 struct vnode *vp = ap->a_vp; 1776 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1777 struct uio *uio = ap->a_uio; 1778 void *win; 1779 size_t tomove, argsize; 1780 vsize_t bytelen; 1781 int error, ubcflags; 1782 1783 read_msg = NULL; 1784 error = 0; 1785 1786 /* std sanity */ 1787 if (uio->uio_resid == 0) 1788 return 0; 1789 if (uio->uio_offset < 0) 1790 return EINVAL; 1791 1792 if (vp->v_type == VREG && PUFFS_USE_PAGECACHE(pmp)) { 1793 const int advice = IO_ADV_DECODE(ap->a_ioflag); 1794 1795 ubcflags = 0; 1796 if (UBC_WANT_UNMAP(vp)) 1797 ubcflags = UBC_UNMAP; 1798 1799 while (uio->uio_resid > 0) { 1800 bytelen = MIN(uio->uio_resid, 1801 vp->v_size - uio->uio_offset); 1802 if (bytelen == 0) 1803 break; 1804 1805 win = ubc_alloc(&vp->v_uobj, uio->uio_offset, 1806 &bytelen, advice, UBC_READ); 1807 error = uiomove(win, bytelen, uio); 1808 ubc_release(win, ubcflags); 1809 if (error) 1810 break; 1811 } 1812 1813 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1814 puffs_updatenode(VPTOPP(vp), PUFFS_UPDATEATIME, 0); 1815 } else { 1816 /* 1817 * in case it's not a regular file or we're operating 1818 * uncached, do read in the old-fashioned style, 1819 * i.e. explicit read operations 1820 */ 1821 1822 tomove = PUFFS_TOMOVE(uio->uio_resid, pmp); 1823 argsize = sizeof(struct puffs_vnmsg_read); 1824 puffs_msgmem_alloc(argsize + tomove, &park_read, 1825 (void **)&read_msg, 1); 1826 1827 error = 0; 1828 while (uio->uio_resid > 0) { 1829 tomove = PUFFS_TOMOVE(uio->uio_resid, pmp); 1830 memset(read_msg, 0, argsize); /* XXX: touser KASSERT */ 1831 RWARGS(read_msg, ap->a_ioflag, tomove, 1832 uio->uio_offset, ap->a_cred); 1833 puffs_msg_setinfo(park_read, PUFFSOP_VN, 1834 PUFFS_VN_READ, VPTOPNC(vp)); 1835 puffs_msg_setdelta(park_read, tomove); 1836 1837 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_read, vp->v_data, 1838 NULL, error); 1839 error = checkerr(pmp, error, __func__); 1840 if (error) 1841 break; 1842 1843 if (read_msg->pvnr_resid > tomove) { 1844 puffs_senderr(pmp, PUFFS_ERR_READ, 1845 E2BIG, "resid grew", VPTOPNC(ap->a_vp)); 1846 error = EPROTO; 1847 break; 1848 } 1849 1850 error = uiomove(read_msg->pvnr_data, 1851 tomove - read_msg->pvnr_resid, uio); 1852 1853 /* 1854 * in case the file is out of juice, resid from 1855 * userspace is != 0. and the error-case is 1856 * quite obvious 1857 */ 1858 if (error || read_msg->pvnr_resid) 1859 break; 1860 } 1861 1862 puffs_msgmem_release(park_read); 1863 } 1864 1865 return error; 1866 } 1867 1868 /* 1869 * XXX: in case of a failure, this leaves uio in a bad state. 1870 * We could theoretically copy the uio and iovecs and "replay" 1871 * them the right amount after the userspace trip, but don't 1872 * bother for now. 1873 */ 1874 int 1875 puffs_vnop_write(void *v) 1876 { 1877 struct vop_write_args /* { 1878 const struct vnodeop_desc *a_desc; 1879 struct vnode *a_vp; 1880 struct uio *a_uio; 1881 int a_ioflag; 1882 kauth_cred_t a_cred; 1883 } */ *ap = v; 1884 PUFFS_MSG_VARS(vn, write); 1885 struct vnode *vp = ap->a_vp; 1886 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1887 struct uio *uio = ap->a_uio; 1888 size_t tomove, argsize; 1889 off_t oldoff, newoff, origoff; 1890 vsize_t bytelen; 1891 int error, uflags; 1892 int ubcflags; 1893 1894 error = uflags = 0; 1895 write_msg = NULL; 1896 1897 if (vp->v_type == VREG && PUFFS_USE_PAGECACHE(pmp)) { 1898 ubcflags = UBC_WRITE | UBC_PARTIALOK; 1899 if (UBC_WANT_UNMAP(vp)) 1900 ubcflags |= UBC_UNMAP; 1901 1902 /* 1903 * userspace *should* be allowed to control this, 1904 * but with UBC it's a bit unclear how to handle it 1905 */ 1906 if (ap->a_ioflag & IO_APPEND) 1907 uio->uio_offset = vp->v_size; 1908 1909 origoff = uio->uio_offset; 1910 while (uio->uio_resid > 0) { 1911 uflags |= PUFFS_UPDATECTIME; 1912 uflags |= PUFFS_UPDATEMTIME; 1913 oldoff = uio->uio_offset; 1914 bytelen = uio->uio_resid; 1915 1916 newoff = oldoff + bytelen; 1917 if (vp->v_size < newoff) { 1918 uvm_vnp_setwritesize(vp, newoff); 1919 } 1920 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, 1921 UVM_ADV_RANDOM, ubcflags); 1922 1923 /* 1924 * In case of a ubc_uiomove() error, 1925 * opt to not extend the file at all and 1926 * return an error. Otherwise, if we attempt 1927 * to clear the memory we couldn't fault to, 1928 * we might generate a kernel page fault. 1929 */ 1930 if (vp->v_size < newoff) { 1931 if (error == 0) { 1932 uflags |= PUFFS_UPDATESIZE; 1933 uvm_vnp_setsize(vp, newoff); 1934 } else { 1935 uvm_vnp_setwritesize(vp, vp->v_size); 1936 } 1937 } 1938 if (error) 1939 break; 1940 1941 /* 1942 * If we're writing large files, flush to file server 1943 * every 64k. Otherwise we can very easily exhaust 1944 * kernel and user memory, as the file server cannot 1945 * really keep up with our writing speed. 1946 * 1947 * Note: this does *NOT* honor MNT_ASYNC, because 1948 * that gives userland too much say in the kernel. 1949 */ 1950 if (oldoff >> 16 != uio->uio_offset >> 16) { 1951 simple_lock(&vp->v_interlock); 1952 error = VOP_PUTPAGES(vp, oldoff & ~0xffff, 1953 uio->uio_offset & ~0xffff, 1954 PGO_CLEANIT | PGO_SYNCIO); 1955 if (error) 1956 break; 1957 } 1958 } 1959 1960 /* synchronous I/O? */ 1961 if (error == 0 && ap->a_ioflag & IO_SYNC) { 1962 simple_lock(&vp->v_interlock); 1963 error = VOP_PUTPAGES(vp, trunc_page(origoff), 1964 round_page(uio->uio_offset), 1965 PGO_CLEANIT | PGO_SYNCIO); 1966 1967 /* write through page cache? */ 1968 } else if (error == 0 && pmp->pmp_flags & PUFFS_KFLAG_WTCACHE) { 1969 simple_lock(&vp->v_interlock); 1970 error = VOP_PUTPAGES(vp, trunc_page(origoff), 1971 round_page(uio->uio_offset), PGO_CLEANIT); 1972 } 1973 1974 puffs_updatenode(VPTOPP(vp), uflags, vp->v_size); 1975 } else { 1976 /* tomove is non-increasing */ 1977 tomove = PUFFS_TOMOVE(uio->uio_resid, pmp); 1978 argsize = sizeof(struct puffs_vnmsg_write) + tomove; 1979 puffs_msgmem_alloc(argsize, &park_write, (void **)&write_msg,1); 1980 1981 while (uio->uio_resid > 0) { 1982 /* move data to buffer */ 1983 tomove = PUFFS_TOMOVE(uio->uio_resid, pmp); 1984 memset(write_msg, 0, argsize); /* XXX: touser KASSERT */ 1985 RWARGS(write_msg, ap->a_ioflag, tomove, 1986 uio->uio_offset, ap->a_cred); 1987 error = uiomove(write_msg->pvnr_data, tomove, uio); 1988 if (error) 1989 break; 1990 1991 /* move buffer to userspace */ 1992 puffs_msg_setinfo(park_write, PUFFSOP_VN, 1993 PUFFS_VN_WRITE, VPTOPNC(vp)); 1994 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_write, vp->v_data, 1995 NULL, error); 1996 error = checkerr(pmp, error, __func__); 1997 if (error) 1998 break; 1999 2000 if (write_msg->pvnr_resid > tomove) { 2001 puffs_senderr(pmp, PUFFS_ERR_WRITE, 2002 E2BIG, "resid grew", VPTOPNC(ap->a_vp)); 2003 error = EPROTO; 2004 break; 2005 } 2006 2007 /* adjust file size */ 2008 if (vp->v_size < uio->uio_offset) 2009 uvm_vnp_setsize(vp, uio->uio_offset); 2010 2011 /* didn't move everything? bad userspace. bail */ 2012 if (write_msg->pvnr_resid != 0) { 2013 error = EIO; 2014 break; 2015 } 2016 } 2017 puffs_msgmem_release(park_write); 2018 } 2019 2020 return error; 2021 } 2022 2023 int 2024 puffs_vnop_print(void *v) 2025 { 2026 struct vop_print_args /* { 2027 struct vnode *a_vp; 2028 } */ *ap = v; 2029 PUFFS_MSG_VARS(vn, print); 2030 struct vnode *vp = ap->a_vp; 2031 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2032 struct puffs_node *pn = vp->v_data; 2033 int error; 2034 2035 /* kernel portion */ 2036 printf("tag VT_PUFFS, vnode %p, puffs node: %p,\n" 2037 " userspace cookie: %p\n", vp, pn, pn->pn_cookie); 2038 if (vp->v_type == VFIFO) 2039 fifo_printinfo(vp); 2040 lockmgr_printinfo(&vp->v_lock); 2041 2042 /* userspace portion */ 2043 if (EXISTSOP(pmp, PRINT)) { 2044 PUFFS_MSG_ALLOC(vn, print); 2045 puffs_msg_setinfo(park_print, PUFFSOP_VN, 2046 PUFFS_VN_PRINT, VPTOPNC(vp)); 2047 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_print, vp->v_data, 2048 NULL, error); 2049 PUFFS_MSG_RELEASE(print); 2050 } 2051 2052 return 0; 2053 } 2054 2055 int 2056 puffs_vnop_pathconf(void *v) 2057 { 2058 struct vop_pathconf_args /* { 2059 const struct vnodeop_desc *a_desc; 2060 struct vnode *a_vp; 2061 int a_name; 2062 register_t *a_retval; 2063 } */ *ap = v; 2064 PUFFS_MSG_VARS(vn, pathconf); 2065 struct vnode *vp = ap->a_vp; 2066 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2067 int error; 2068 2069 PUFFS_MSG_ALLOC(vn, pathconf); 2070 pathconf_msg->pvnr_name = ap->a_name; 2071 puffs_msg_setinfo(park_pathconf, PUFFSOP_VN, 2072 PUFFS_VN_PATHCONF, VPTOPNC(vp)); 2073 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_pathconf, vp->v_data, NULL, error); 2074 error = checkerr(pmp, error, __func__); 2075 if (!error) 2076 *ap->a_retval = pathconf_msg->pvnr_retval; 2077 PUFFS_MSG_RELEASE(pathconf); 2078 2079 return error; 2080 } 2081 2082 int 2083 puffs_vnop_advlock(void *v) 2084 { 2085 struct vop_advlock_args /* { 2086 const struct vnodeop_desc *a_desc; 2087 struct vnode *a_vp; 2088 void *a_id; 2089 int a_op; 2090 struct flock *a_fl; 2091 int a_flags; 2092 } */ *ap = v; 2093 PUFFS_MSG_VARS(vn, advlock); 2094 struct vnode *vp = ap->a_vp; 2095 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2096 int error; 2097 2098 PUFFS_MSG_ALLOC(vn, advlock); 2099 error = copyin(ap->a_fl, &advlock_msg->pvnr_fl, sizeof(struct flock)); 2100 if (error) 2101 goto out; 2102 advlock_msg->pvnr_id = ap->a_id; 2103 advlock_msg->pvnr_op = ap->a_op; 2104 advlock_msg->pvnr_flags = ap->a_flags; 2105 puffs_msg_setinfo(park_advlock, PUFFSOP_VN, 2106 PUFFS_VN_ADVLOCK, VPTOPNC(vp)); 2107 2108 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_advlock, vp->v_data, NULL, error); 2109 error = checkerr(pmp, error, __func__); 2110 2111 out: 2112 PUFFS_MSG_RELEASE(advlock); 2113 return error; 2114 } 2115 2116 #define BIOASYNC(bp) (bp->b_flags & B_ASYNC) 2117 2118 /* 2119 * This maps itself to PUFFS_VN_READ/WRITE for data transfer. 2120 */ 2121 int 2122 puffs_vnop_strategy(void *v) 2123 { 2124 struct vop_strategy_args /* { 2125 const struct vnodeop_desc *a_desc; 2126 struct vnode *a_vp; 2127 struct buf *a_bp; 2128 } */ *ap = v; 2129 PUFFS_MSG_VARS(vn, rw); 2130 struct vnode *vp = ap->a_vp; 2131 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2132 struct puffs_node *pn; 2133 struct buf *bp; 2134 size_t argsize; 2135 size_t tomove, moved; 2136 int error, dofaf, dobiodone; 2137 2138 pmp = MPTOPUFFSMP(vp->v_mount); 2139 bp = ap->a_bp; 2140 error = 0; 2141 dofaf = 0; 2142 pn = VPTOPP(vp); 2143 park_rw = NULL; /* explicit */ 2144 dobiodone = 1; 2145 2146 if ((BUF_ISREAD(bp) && !EXISTSOP(pmp, READ)) 2147 || (BUF_ISWRITE(bp) && !EXISTSOP(pmp, WRITE))) 2148 ERROUT(EOPNOTSUPP); 2149 2150 /* 2151 * Short-circuit optimization: don't flush buffer in between 2152 * VOP_INACTIVE and VOP_RECLAIM in case the node has no references. 2153 */ 2154 if (pn->pn_stat & PNODE_DYING) { 2155 KASSERT(BUF_ISWRITE(bp)); 2156 bp->b_resid = 0; 2157 goto out; 2158 } 2159 2160 #ifdef DIAGNOSTIC 2161 if (bp->b_bcount > pmp->pmp_msg_maxsize - PUFFS_MSGSTRUCT_MAX) 2162 panic("puffs_strategy: wildly inappropriate buf bcount %d", 2163 bp->b_bcount); 2164 #endif 2165 2166 /* 2167 * See explanation for the necessity of a FAF in puffs_fsync. 2168 * 2169 * Also, do FAF in case we're suspending. 2170 * See puffs_vfsops.c:pageflush() 2171 */ 2172 if (BUF_ISWRITE(bp)) { 2173 simple_lock(&vp->v_interlock); 2174 if (vp->v_iflag & VI_XLOCK) 2175 dofaf = 1; 2176 if (pn->pn_stat & PNODE_SUSPEND) 2177 dofaf = 1; 2178 simple_unlock(&vp->v_interlock); 2179 } 2180 2181 #ifdef DIAGNOSTIC 2182 if (curlwp == uvm.pagedaemon_lwp) 2183 KASSERT(dofaf || BIOASYNC(bp)); 2184 #endif 2185 2186 /* allocate transport structure */ 2187 tomove = PUFFS_TOMOVE(bp->b_bcount, pmp); 2188 argsize = sizeof(struct puffs_vnmsg_rw); 2189 error = puffs_msgmem_alloc(argsize + tomove, &park_rw, 2190 (void **)&rw_msg, dofaf ? 0 : 1); 2191 if (error) 2192 goto out; 2193 RWARGS(rw_msg, 0, tomove, bp->b_blkno << DEV_BSHIFT, FSCRED); 2194 2195 /* 2x2 cases: read/write, faf/nofaf */ 2196 if (BUF_ISREAD(bp)) { 2197 puffs_msg_setinfo(park_rw, PUFFSOP_VN, 2198 PUFFS_VN_READ, VPTOPNC(vp)); 2199 puffs_msg_setdelta(park_rw, tomove); 2200 if (BIOASYNC(bp)) { 2201 puffs_msg_setcall(park_rw, 2202 puffs_parkdone_asyncbioread, bp); 2203 puffs_msg_enqueue(pmp, park_rw); 2204 dobiodone = 0; 2205 } else { 2206 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_rw, vp->v_data, 2207 NULL, error); 2208 error = checkerr(pmp, error, __func__); 2209 if (error) 2210 goto out; 2211 2212 if (rw_msg->pvnr_resid > tomove) { 2213 puffs_senderr(pmp, PUFFS_ERR_READ, 2214 E2BIG, "resid grew", VPTOPNC(vp)); 2215 ERROUT(EPROTO); 2216 } 2217 2218 moved = tomove - rw_msg->pvnr_resid; 2219 2220 (void)memcpy(bp->b_data, rw_msg->pvnr_data, moved); 2221 bp->b_resid = bp->b_bcount - moved; 2222 } 2223 } else { 2224 puffs_msg_setinfo(park_rw, PUFFSOP_VN, 2225 PUFFS_VN_WRITE, VPTOPNC(vp)); 2226 /* 2227 * make pages read-only before we write them if we want 2228 * write caching info 2229 */ 2230 if (PUFFS_WCACHEINFO(pmp)) { 2231 struct uvm_object *uobj = &vp->v_uobj; 2232 int npages = (bp->b_bcount + PAGE_SIZE-1) >> PAGE_SHIFT; 2233 struct vm_page *vmp; 2234 int i; 2235 2236 for (i = 0; i < npages; i++) { 2237 vmp= uvm_pageratop((vaddr_t)bp->b_data 2238 + (i << PAGE_SHIFT)); 2239 DPRINTF(("puffs_strategy: write-protecting " 2240 "vp %p page %p, offset %" PRId64"\n", 2241 vp, vmp, vmp->offset)); 2242 simple_lock(&uobj->vmobjlock); 2243 vmp->flags |= PG_RDONLY; 2244 pmap_page_protect(vmp, VM_PROT_READ); 2245 simple_unlock(&uobj->vmobjlock); 2246 } 2247 } 2248 2249 (void)memcpy(&rw_msg->pvnr_data, bp->b_data, tomove); 2250 if (dofaf) { 2251 puffs_msg_setfaf(park_rw); 2252 } else if (BIOASYNC(bp)) { 2253 puffs_msg_setcall(park_rw, 2254 puffs_parkdone_asyncbiowrite, bp); 2255 dobiodone = 0; 2256 } 2257 2258 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_rw, vp->v_data, NULL, error); 2259 2260 if (dobiodone == 0) 2261 goto out; 2262 2263 /* 2264 * XXXXXXXX: wrong, but kernel can't survive strategy 2265 * failure currently. Here, have one more X: X. 2266 */ 2267 if (error != ENOMEM) 2268 error = 0; 2269 2270 error = checkerr(pmp, error, __func__); 2271 if (error) 2272 goto out; 2273 2274 if (rw_msg->pvnr_resid > tomove) { 2275 puffs_senderr(pmp, PUFFS_ERR_WRITE, 2276 E2BIG, "resid grew", VPTOPNC(vp)); 2277 ERROUT(EPROTO); 2278 } 2279 2280 /* 2281 * FAF moved everything. Frankly, we don't 2282 * really have a choice. 2283 */ 2284 if (dofaf && error == 0) 2285 moved = tomove; 2286 else 2287 moved = tomove - rw_msg->pvnr_resid; 2288 2289 bp->b_resid = bp->b_bcount - moved; 2290 if (bp->b_resid != 0) { 2291 ERROUT(EIO); 2292 } 2293 } 2294 2295 out: 2296 if (park_rw) 2297 puffs_msgmem_release(park_rw); 2298 2299 if (error) 2300 bp->b_error = error; 2301 2302 if (error || dobiodone) 2303 biodone(bp); 2304 2305 return error; 2306 } 2307 2308 int 2309 puffs_vnop_mmap(void *v) 2310 { 2311 struct vop_mmap_args /* { 2312 const struct vnodeop_desc *a_desc; 2313 struct vnode *a_vp; 2314 vm_prot_t a_prot; 2315 kauth_cred_t a_cred; 2316 } */ *ap = v; 2317 PUFFS_MSG_VARS(vn, mmap); 2318 struct vnode *vp = ap->a_vp; 2319 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2320 int error; 2321 2322 if (!PUFFS_USE_PAGECACHE(pmp)) 2323 return genfs_eopnotsupp(v); 2324 2325 if (EXISTSOP(pmp, MMAP)) { 2326 PUFFS_MSG_ALLOC(vn, mmap); 2327 mmap_msg->pvnr_prot = ap->a_prot; 2328 puffs_credcvt(&mmap_msg->pvnr_cred, ap->a_cred); 2329 puffs_msg_setinfo(park_mmap, PUFFSOP_VN, 2330 PUFFS_VN_MMAP, VPTOPNC(vp)); 2331 2332 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_mmap, vp->v_data, NULL, error); 2333 error = checkerr(pmp, error, __func__); 2334 PUFFS_MSG_RELEASE(mmap); 2335 } else { 2336 error = genfs_mmap(v); 2337 } 2338 2339 return error; 2340 } 2341 2342 2343 /* 2344 * The rest don't get a free trip to userspace and back, they 2345 * have to stay within the kernel. 2346 */ 2347 2348 /* 2349 * bmap doesn't really make any sense for puffs, so just 1:1 map it. 2350 * well, maybe somehow, somewhere, some day .... 2351 */ 2352 int 2353 puffs_vnop_bmap(void *v) 2354 { 2355 struct vop_bmap_args /* { 2356 const struct vnodeop_desc *a_desc; 2357 struct vnode *a_vp; 2358 daddr_t a_bn; 2359 struct vnode **a_vpp; 2360 daddr_t *a_bnp; 2361 int *a_runp; 2362 } */ *ap = v; 2363 struct puffs_mount *pmp; 2364 2365 pmp = MPTOPUFFSMP(ap->a_vp->v_mount); 2366 2367 if (ap->a_vpp) 2368 *ap->a_vpp = ap->a_vp; 2369 if (ap->a_bnp) 2370 *ap->a_bnp = ap->a_bn; 2371 if (ap->a_runp) 2372 *ap->a_runp 2373 = (PUFFS_TOMOVE(pmp->pmp_msg_maxsize, pmp)>>DEV_BSHIFT) - 1; 2374 2375 return 0; 2376 } 2377 2378 /* 2379 * Handle getpages faults in puffs. We let genfs_getpages() do most 2380 * of the dirty work, but we come in this route to do accounting tasks. 2381 * If the user server has specified functions for cache notifications 2382 * about reads and/or writes, we record which type of operation we got, 2383 * for which page range, and proceed to issue a FAF notification to the 2384 * server about it. 2385 */ 2386 int 2387 puffs_vnop_getpages(void *v) 2388 { 2389 struct vop_getpages_args /* { 2390 const struct vnodeop_desc *a_desc; 2391 struct vnode *a_vp; 2392 voff_t a_offset; 2393 struct vm_page **a_m; 2394 int *a_count; 2395 int a_centeridx; 2396 vm_prot_t a_access_type; 2397 int a_advice; 2398 int a_flags; 2399 } */ *ap = v; 2400 struct puffs_mount *pmp; 2401 struct puffs_node *pn; 2402 struct vnode *vp; 2403 struct vm_page **pgs; 2404 struct puffs_cacheinfo *pcinfo = NULL; 2405 struct puffs_cacherun *pcrun; 2406 void *parkmem = NULL; 2407 size_t runsizes; 2408 int i, npages, si, streakon; 2409 int error, locked, write; 2410 2411 pmp = MPTOPUFFSMP(ap->a_vp->v_mount); 2412 npages = *ap->a_count; 2413 pgs = ap->a_m; 2414 vp = ap->a_vp; 2415 pn = vp->v_data; 2416 locked = (ap->a_flags & PGO_LOCKED) != 0; 2417 write = (ap->a_access_type & VM_PROT_WRITE) != 0; 2418 2419 /* ccg xnaht - gets Wuninitialized wrong */ 2420 pcrun = NULL; 2421 runsizes = 0; 2422 2423 /* 2424 * Check that we aren't trying to fault in pages which our file 2425 * server doesn't know about. This happens if we extend a file by 2426 * skipping some pages and later try to fault in pages which 2427 * are between pn_serversize and vp_size. This check optimizes 2428 * away the common case where a file is being extended. 2429 */ 2430 if (ap->a_offset >= pn->pn_serversize && ap->a_offset < vp->v_size) { 2431 struct vattr va; 2432 2433 /* try again later when we can block */ 2434 if (locked) 2435 ERROUT(EBUSY); 2436 2437 simple_unlock(&vp->v_interlock); 2438 vattr_null(&va); 2439 va.va_size = vp->v_size; 2440 error = dosetattr(vp, &va, FSCRED, 0); 2441 if (error) 2442 ERROUT(error); 2443 simple_lock(&vp->v_interlock); 2444 } 2445 2446 if (write && PUFFS_WCACHEINFO(pmp)) { 2447 #ifdef notnowjohn 2448 /* allocate worst-case memory */ 2449 runsizes = ((npages / 2) + 1) * sizeof(struct puffs_cacherun); 2450 pcinfo = kmem_zalloc(sizeof_puffs_cacheinfo) + runsize, 2451 locked ? KM_NOSLEEP : KM_SLEEP); 2452 2453 /* 2454 * can't block if we're locked and can't mess up caching 2455 * information for fs server. so come back later, please 2456 */ 2457 if (pcinfo == NULL) 2458 ERROUT(ENOMEM); 2459 2460 parkmem = puffs_park_alloc(locked == 0); 2461 if (parkmem == NULL) 2462 ERROUT(ENOMEM); 2463 2464 pcrun = pcinfo->pcache_runs; 2465 #else 2466 (void)parkmem; 2467 #endif 2468 } 2469 2470 error = genfs_getpages(v); 2471 if (error) 2472 goto out; 2473 2474 if (PUFFS_WCACHEINFO(pmp) == 0) 2475 goto out; 2476 2477 /* 2478 * Let's see whose fault it was and inform the user server of 2479 * possibly read/written pages. Map pages from read faults 2480 * strictly read-only, since otherwise we might miss info on 2481 * when the page is actually write-faulted to. 2482 */ 2483 if (!locked) 2484 simple_lock(&vp->v_uobj.vmobjlock); 2485 for (i = 0, si = 0, streakon = 0; i < npages; i++) { 2486 if (pgs[i] == NULL || pgs[i] == PGO_DONTCARE) { 2487 if (streakon && write) { 2488 streakon = 0; 2489 pcrun[si].pcache_runend 2490 = trunc_page(pgs[i]->offset) + PAGE_MASK; 2491 si++; 2492 } 2493 continue; 2494 } 2495 if (streakon == 0 && write) { 2496 streakon = 1; 2497 pcrun[si].pcache_runstart = pgs[i]->offset; 2498 } 2499 2500 if (!write) 2501 pgs[i]->flags |= PG_RDONLY; 2502 } 2503 /* was the last page part of our streak? */ 2504 if (streakon) { 2505 pcrun[si].pcache_runend 2506 = trunc_page(pgs[i-1]->offset) + PAGE_MASK; 2507 si++; 2508 } 2509 if (!locked) 2510 simple_unlock(&vp->v_uobj.vmobjlock); 2511 2512 KASSERT(si <= (npages / 2) + 1); 2513 2514 #ifdef notnowjohn 2515 /* send results to userspace */ 2516 if (write) 2517 puffs_cacheop(pmp, parkmem, pcinfo, 2518 sizeof(struct puffs_cacheinfo) + runsizes, VPTOPNC(vp)); 2519 #endif 2520 2521 out: 2522 if (error) { 2523 if (pcinfo != NULL) 2524 kmem_free(pcinfo, 2525 sizeof(struct puffs_cacheinfo) + runsizes); 2526 #ifdef notnowjohn 2527 if (parkmem != NULL) 2528 puffs_park_release(parkmem, 1); 2529 #endif 2530 } 2531 2532 return error; 2533 } 2534 2535 int 2536 puffs_vnop_lock(void *v) 2537 { 2538 struct vop_lock_args /* { 2539 struct vnode *a_vp; 2540 int a_flags; 2541 }*/ *ap = v; 2542 struct vnode *vp = ap->a_vp; 2543 struct mount *mp = vp->v_mount; 2544 2545 #if 0 2546 DPRINTF(("puffs_lock: lock %p, args 0x%x\n", vp, ap->a_flags)); 2547 #endif 2548 2549 /* 2550 * XXX: this avoids deadlocking when we're suspending. 2551 * e.g. some ops holding the vnode lock might be blocked for 2552 * the vfs transaction lock so we'd deadlock. 2553 * 2554 * Now once again this is skating on the thin ice of modern life, 2555 * since we are breaking the consistency guarantee provided 2556 * _to the user server_ by vnode locking. Hopefully this will 2557 * get fixed soon enough by getting rid of the dependency on 2558 * vnode locks alltogether. 2559 */ 2560 if (fstrans_is_owner(mp) && fstrans_getstate(mp) == FSTRANS_SUSPENDING){ 2561 if (ap->a_flags & LK_INTERLOCK) 2562 simple_unlock(&vp->v_interlock); 2563 return 0; 2564 } 2565 2566 return lockmgr(&vp->v_lock, ap->a_flags, &vp->v_interlock); 2567 } 2568 2569 int 2570 puffs_vnop_unlock(void *v) 2571 { 2572 struct vop_unlock_args /* { 2573 struct vnode *a_vp; 2574 int a_flags; 2575 } */ *ap = v; 2576 struct vnode *vp = ap->a_vp; 2577 struct mount *mp = vp->v_mount; 2578 2579 #if 0 2580 DPRINTF(("puffs_unlock: lock %p, args 0x%x\n", vp, ap->a_flags)); 2581 #endif 2582 2583 /* XXX: see puffs_lock() */ 2584 if (fstrans_is_owner(mp) && fstrans_getstate(mp) == FSTRANS_SUSPENDING){ 2585 if (ap->a_flags & LK_INTERLOCK) 2586 simple_unlock(&vp->v_interlock); 2587 return 0; 2588 } 2589 2590 return lockmgr(&vp->v_lock, ap->a_flags | LK_RELEASE, &vp->v_interlock); 2591 } 2592 2593 int 2594 puffs_vnop_islocked(void *v) 2595 { 2596 struct vop_islocked_args *ap = v; 2597 int rv; 2598 2599 rv = lockstatus(&ap->a_vp->v_lock); 2600 return rv; 2601 } 2602 2603 2604 /* 2605 * spec & fifo. These call the miscfs spec and fifo vectors, but issue 2606 * FAF update information for the puffs node first. 2607 */ 2608 int 2609 puffs_vnop_spec_read(void *v) 2610 { 2611 struct vop_read_args /* { 2612 const struct vnodeop_desc *a_desc; 2613 struct vnode *a_vp; 2614 struct uio *a_uio; 2615 int a_ioflag; 2616 kauth_cred_t a_cred; 2617 } */ *ap = v; 2618 2619 puffs_updatenode(VPTOPP(ap->a_vp), PUFFS_UPDATEATIME, 0); 2620 return VOCALL(spec_vnodeop_p, VOFFSET(vop_read), v); 2621 } 2622 2623 int 2624 puffs_vnop_spec_write(void *v) 2625 { 2626 struct vop_write_args /* { 2627 const struct vnodeop_desc *a_desc; 2628 struct vnode *a_vp; 2629 struct uio *a_uio; 2630 int a_ioflag; 2631 kauth_cred_t a_cred; 2632 }*/ *ap = v; 2633 2634 puffs_updatenode(VPTOPP(ap->a_vp), PUFFS_UPDATEMTIME, 0); 2635 return VOCALL(spec_vnodeop_p, VOFFSET(vop_write), v); 2636 } 2637 2638 int 2639 puffs_vnop_fifo_read(void *v) 2640 { 2641 struct vop_read_args /* { 2642 const struct vnodeop_desc *a_desc; 2643 struct vnode *a_vp; 2644 struct uio *a_uio; 2645 int a_ioflag; 2646 kauth_cred_t a_cred; 2647 } */ *ap = v; 2648 2649 puffs_updatenode(VPTOPP(ap->a_vp), PUFFS_UPDATEATIME, 0); 2650 return VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), v); 2651 } 2652 2653 int 2654 puffs_vnop_fifo_write(void *v) 2655 { 2656 struct vop_write_args /* { 2657 const struct vnodeop_desc *a_desc; 2658 struct vnode *a_vp; 2659 struct uio *a_uio; 2660 int a_ioflag; 2661 kauth_cred_t a_cred; 2662 }*/ *ap = v; 2663 2664 puffs_updatenode(VPTOPP(ap->a_vp), PUFFS_UPDATEMTIME, 0); 2665 return VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), v); 2666 } 2667
Indexes created Tue Sep 30 20:09:53 GMT 2025