puffs_vnops.c revision 1.132
1 /* $NetBSD: puffs_vnops.c,v 1.132 2009/09/12 18:17:55 tsutsui 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 1.132 2009/09/12 18:17:55 tsutsui Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/buf.h> 37 #include <sys/fstrans.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 44 #include <uvm/uvm.h> 45 46 #include <fs/puffs/puffs_msgif.h> 47 #include <fs/puffs/puffs_sys.h> 48 49 #include <miscfs/fifofs/fifo.h> 50 #include <miscfs/genfs/genfs.h> 51 #include <miscfs/specfs/specdev.h> 52 53 int puffs_vnop_lookup(void *); 54 int puffs_vnop_create(void *); 55 int puffs_vnop_access(void *); 56 int puffs_vnop_mknod(void *); 57 int puffs_vnop_open(void *); 58 int puffs_vnop_close(void *); 59 int puffs_vnop_getattr(void *); 60 int puffs_vnop_setattr(void *); 61 int puffs_vnop_reclaim(void *); 62 int puffs_vnop_readdir(void *); 63 int puffs_vnop_poll(void *); 64 int puffs_vnop_fsync(void *); 65 int puffs_vnop_seek(void *); 66 int puffs_vnop_remove(void *); 67 int puffs_vnop_mkdir(void *); 68 int puffs_vnop_rmdir(void *); 69 int puffs_vnop_link(void *); 70 int puffs_vnop_readlink(void *); 71 int puffs_vnop_symlink(void *); 72 int puffs_vnop_rename(void *); 73 int puffs_vnop_read(void *); 74 int puffs_vnop_write(void *); 75 int puffs_vnop_fcntl(void *); 76 int puffs_vnop_ioctl(void *); 77 int puffs_vnop_inactive(void *); 78 int puffs_vnop_print(void *); 79 int puffs_vnop_pathconf(void *); 80 int puffs_vnop_advlock(void *); 81 int puffs_vnop_strategy(void *); 82 int puffs_vnop_bmap(void *); 83 int puffs_vnop_mmap(void *); 84 int puffs_vnop_getpages(void *); 85 86 int puffs_vnop_spec_read(void *); 87 int puffs_vnop_spec_write(void *); 88 int puffs_vnop_fifo_read(void *); 89 int puffs_vnop_fifo_write(void *); 90 91 int puffs_vnop_checkop(void *); 92 93 94 #if 0 95 #define puffs_lock genfs_lock 96 #define puffs_unlock genfs_unlock 97 #define puffs_islocked genfs_islocked 98 #else 99 int puffs_vnop_lock(void *); 100 int puffs_vnop_unlock(void *); 101 int puffs_vnop_islocked(void *); 102 #endif 103 104 int (**puffs_vnodeop_p)(void *); 105 const struct vnodeopv_entry_desc puffs_vnodeop_entries[] = { 106 { &vop_default_desc, vn_default_error }, 107 { &vop_lookup_desc, puffs_vnop_lookup }, /* REAL lookup */ 108 { &vop_create_desc, puffs_vnop_checkop }, /* create */ 109 { &vop_mknod_desc, puffs_vnop_checkop }, /* mknod */ 110 { &vop_open_desc, puffs_vnop_open }, /* REAL open */ 111 { &vop_close_desc, puffs_vnop_checkop }, /* close */ 112 { &vop_access_desc, puffs_vnop_access }, /* REAL access */ 113 { &vop_getattr_desc, puffs_vnop_checkop }, /* getattr */ 114 { &vop_setattr_desc, puffs_vnop_checkop }, /* setattr */ 115 { &vop_read_desc, puffs_vnop_checkop }, /* read */ 116 { &vop_write_desc, puffs_vnop_checkop }, /* write */ 117 { &vop_fsync_desc, puffs_vnop_fsync }, /* REAL fsync */ 118 { &vop_seek_desc, puffs_vnop_checkop }, /* seek */ 119 { &vop_remove_desc, puffs_vnop_checkop }, /* remove */ 120 { &vop_link_desc, puffs_vnop_checkop }, /* link */ 121 { &vop_rename_desc, puffs_vnop_checkop }, /* rename */ 122 { &vop_mkdir_desc, puffs_vnop_checkop }, /* mkdir */ 123 { &vop_rmdir_desc, puffs_vnop_checkop }, /* rmdir */ 124 { &vop_symlink_desc, puffs_vnop_checkop }, /* symlink */ 125 { &vop_readdir_desc, puffs_vnop_checkop }, /* readdir */ 126 { &vop_readlink_desc, puffs_vnop_checkop }, /* readlink */ 127 { &vop_getpages_desc, puffs_vnop_checkop }, /* getpages */ 128 { &vop_putpages_desc, genfs_putpages }, /* REAL putpages */ 129 { &vop_pathconf_desc, puffs_vnop_checkop }, /* pathconf */ 130 { &vop_advlock_desc, puffs_vnop_checkop }, /* advlock */ 131 { &vop_strategy_desc, puffs_vnop_strategy }, /* REAL strategy */ 132 { &vop_revoke_desc, genfs_revoke }, /* REAL revoke */ 133 { &vop_abortop_desc, genfs_abortop }, /* REAL abortop */ 134 { &vop_inactive_desc, puffs_vnop_inactive }, /* REAL inactive */ 135 { &vop_reclaim_desc, puffs_vnop_reclaim }, /* REAL reclaim */ 136 { &vop_lock_desc, puffs_vnop_lock }, /* REAL lock */ 137 { &vop_unlock_desc, puffs_vnop_unlock }, /* REAL unlock */ 138 { &vop_bmap_desc, puffs_vnop_bmap }, /* REAL bmap */ 139 { &vop_print_desc, puffs_vnop_print }, /* REAL print */ 140 { &vop_islocked_desc, puffs_vnop_islocked }, /* REAL islocked */ 141 { &vop_bwrite_desc, genfs_nullop }, /* REAL bwrite */ 142 { &vop_mmap_desc, puffs_vnop_mmap }, /* REAL mmap */ 143 { &vop_poll_desc, puffs_vnop_poll }, /* REAL poll */ 144 145 { &vop_kqfilter_desc, genfs_eopnotsupp }, /* kqfilter XXX */ 146 { NULL, NULL } 147 }; 148 const struct vnodeopv_desc puffs_vnodeop_opv_desc = 149 { &puffs_vnodeop_p, puffs_vnodeop_entries }; 150 151 152 int (**puffs_specop_p)(void *); 153 const struct vnodeopv_entry_desc puffs_specop_entries[] = { 154 { &vop_default_desc, vn_default_error }, 155 { &vop_lookup_desc, spec_lookup }, /* lookup, ENOTDIR */ 156 { &vop_create_desc, spec_create }, /* genfs_badop */ 157 { &vop_mknod_desc, spec_mknod }, /* genfs_badop */ 158 { &vop_open_desc, spec_open }, /* spec_open */ 159 { &vop_close_desc, spec_close }, /* spec_close */ 160 { &vop_access_desc, puffs_vnop_checkop }, /* access */ 161 { &vop_getattr_desc, puffs_vnop_checkop }, /* getattr */ 162 { &vop_setattr_desc, puffs_vnop_checkop }, /* setattr */ 163 { &vop_read_desc, puffs_vnop_spec_read }, /* update, read */ 164 { &vop_write_desc, puffs_vnop_spec_write }, /* update, write */ 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_ioctl_desc, fifo_ioctl }, /* ioctl */ 223 { &vop_fcntl_desc, genfs_fcntl }, /* dummy */ 224 { &vop_poll_desc, fifo_poll }, /* poll */ 225 { &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */ 226 { &vop_revoke_desc, fifo_revoke }, /* genfs_revoke */ 227 { &vop_mmap_desc, fifo_mmap }, /* genfs_badop */ 228 { &vop_fsync_desc, fifo_fsync }, /* genfs_nullop*/ 229 { &vop_seek_desc, fifo_seek }, /* genfs_badop */ 230 { &vop_remove_desc, fifo_remove }, /* genfs_badop */ 231 { &vop_link_desc, fifo_link }, /* genfs_badop */ 232 { &vop_rename_desc, fifo_rename }, /* genfs_badop */ 233 { &vop_mkdir_desc, fifo_mkdir }, /* genfs_badop */ 234 { &vop_rmdir_desc, fifo_rmdir }, /* genfs_badop */ 235 { &vop_symlink_desc, fifo_symlink }, /* genfs_badop */ 236 { &vop_readdir_desc, fifo_readdir }, /* genfs_badop */ 237 { &vop_readlink_desc, fifo_readlink }, /* genfs_badop */ 238 { &vop_abortop_desc, fifo_abortop }, /* genfs_badop */ 239 { &vop_inactive_desc, puffs_vnop_inactive }, /* REAL inactive */ 240 { &vop_reclaim_desc, puffs_vnop_reclaim }, /* REAL reclaim */ 241 { &vop_lock_desc, puffs_vnop_lock }, /* REAL lock */ 242 { &vop_unlock_desc, puffs_vnop_unlock }, /* REAL unlock */ 243 { &vop_bmap_desc, fifo_bmap }, /* dummy */ 244 { &vop_strategy_desc, fifo_strategy }, /* genfs_badop */ 245 { &vop_print_desc, puffs_vnop_print }, /* REAL print */ 246 { &vop_islocked_desc, puffs_vnop_islocked }, /* REAL islocked */ 247 { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */ 248 { &vop_advlock_desc, fifo_advlock }, /* genfs_einval */ 249 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 250 { &vop_putpages_desc, fifo_putpages }, /* genfs_null_putpages*/ 251 #if 0 252 { &vop_openextattr_desc, _openextattr }, /* openextattr */ 253 { &vop_closeextattr_desc, _closeextattr }, /* closeextattr */ 254 { &vop_getextattr_desc, _getextattr }, /* getextattr */ 255 { &vop_setextattr_desc, _setextattr }, /* setextattr */ 256 { &vop_listextattr_desc, _listextattr }, /* listextattr */ 257 { &vop_deleteextattr_desc, _deleteextattr }, /* deleteextattr */ 258 #endif 259 { NULL, NULL } 260 }; 261 const struct vnodeopv_desc puffs_fifoop_opv_desc = 262 { &puffs_fifoop_p, puffs_fifoop_entries }; 263 264 265 /* "real" vnode operations */ 266 int (**puffs_msgop_p)(void *); 267 const struct vnodeopv_entry_desc puffs_msgop_entries[] = { 268 { &vop_default_desc, vn_default_error }, 269 { &vop_create_desc, puffs_vnop_create }, /* create */ 270 { &vop_mknod_desc, puffs_vnop_mknod }, /* mknod */ 271 { &vop_open_desc, puffs_vnop_open }, /* open */ 272 { &vop_close_desc, puffs_vnop_close }, /* close */ 273 { &vop_access_desc, puffs_vnop_access }, /* access */ 274 { &vop_getattr_desc, puffs_vnop_getattr }, /* getattr */ 275 { &vop_setattr_desc, puffs_vnop_setattr }, /* setattr */ 276 { &vop_read_desc, puffs_vnop_read }, /* read */ 277 { &vop_write_desc, puffs_vnop_write }, /* write */ 278 { &vop_seek_desc, puffs_vnop_seek }, /* seek */ 279 { &vop_remove_desc, puffs_vnop_remove }, /* remove */ 280 { &vop_link_desc, puffs_vnop_link }, /* link */ 281 { &vop_rename_desc, puffs_vnop_rename }, /* rename */ 282 { &vop_mkdir_desc, puffs_vnop_mkdir }, /* mkdir */ 283 { &vop_rmdir_desc, puffs_vnop_rmdir }, /* rmdir */ 284 { &vop_symlink_desc, puffs_vnop_symlink }, /* symlink */ 285 { &vop_readdir_desc, puffs_vnop_readdir }, /* readdir */ 286 { &vop_readlink_desc, puffs_vnop_readlink }, /* readlink */ 287 { &vop_print_desc, puffs_vnop_print }, /* print */ 288 { &vop_islocked_desc, puffs_vnop_islocked }, /* islocked */ 289 { &vop_pathconf_desc, puffs_vnop_pathconf }, /* pathconf */ 290 { &vop_advlock_desc, puffs_vnop_advlock }, /* advlock */ 291 { &vop_getpages_desc, puffs_vnop_getpages }, /* getpages */ 292 { NULL, NULL } 293 }; 294 const struct vnodeopv_desc puffs_msgop_opv_desc = 295 { &puffs_msgop_p, puffs_msgop_entries }; 296 297 298 #define ERROUT(err) \ 299 do { \ 300 error = err; \ 301 goto out; \ 302 } while (/*CONSTCOND*/0) 303 304 /* 305 * This is a generic vnode operation handler. It checks if the necessary 306 * operations for the called vnode operation are implemented by userspace 307 * and either returns a dummy return value or proceeds to call the real 308 * vnode operation from puffs_msgop_v. 309 * 310 * XXX: this should described elsewhere and autogenerated, the complexity 311 * of the vnode operations vectors and their interrelationships is also 312 * getting a bit out of hand. Another problem is that we need this same 313 * information in the fs server code, so keeping the two in sync manually 314 * is not a viable (long term) plan. 315 */ 316 317 /* not supported, handle locking protocol */ 318 #define CHECKOP_NOTSUPP(op) \ 319 case VOP_##op##_DESCOFFSET: \ 320 if (pmp->pmp_vnopmask[PUFFS_VN_##op] == 0) \ 321 return genfs_eopnotsupp(v); \ 322 break 323 324 /* always succeed, no locking */ 325 #define CHECKOP_SUCCESS(op) \ 326 case VOP_##op##_DESCOFFSET: \ 327 if (pmp->pmp_vnopmask[PUFFS_VN_##op] == 0) \ 328 return 0; \ 329 break 330 331 int 332 puffs_vnop_checkop(void *v) 333 { 334 struct vop_generic_args /* { 335 struct vnodeop_desc *a_desc; 336 spooky mystery contents; 337 } */ *ap = v; 338 struct vnodeop_desc *desc = ap->a_desc; 339 struct puffs_mount *pmp; 340 struct vnode *vp; 341 int offset, rv; 342 343 offset = ap->a_desc->vdesc_vp_offsets[0]; 344 #ifdef DIAGNOSTIC 345 if (offset == VDESC_NO_OFFSET) 346 panic("puffs_checkop: no vnode, why did you call me?"); 347 #endif 348 vp = *VOPARG_OFFSETTO(struct vnode **, offset, ap); 349 pmp = MPTOPUFFSMP(vp->v_mount); 350 351 DPRINTF_VERBOSE(("checkop call %s (%d), vp %p\n", 352 ap->a_desc->vdesc_name, ap->a_desc->vdesc_offset, vp)); 353 354 if (!ALLOPS(pmp)) { 355 switch (desc->vdesc_offset) { 356 CHECKOP_NOTSUPP(CREATE); 357 CHECKOP_NOTSUPP(MKNOD); 358 CHECKOP_NOTSUPP(GETATTR); 359 CHECKOP_NOTSUPP(SETATTR); 360 CHECKOP_NOTSUPP(READ); 361 CHECKOP_NOTSUPP(WRITE); 362 CHECKOP_NOTSUPP(FCNTL); 363 CHECKOP_NOTSUPP(IOCTL); 364 CHECKOP_NOTSUPP(REMOVE); 365 CHECKOP_NOTSUPP(LINK); 366 CHECKOP_NOTSUPP(RENAME); 367 CHECKOP_NOTSUPP(MKDIR); 368 CHECKOP_NOTSUPP(RMDIR); 369 CHECKOP_NOTSUPP(SYMLINK); 370 CHECKOP_NOTSUPP(READDIR); 371 CHECKOP_NOTSUPP(READLINK); 372 CHECKOP_NOTSUPP(PRINT); 373 CHECKOP_NOTSUPP(PATHCONF); 374 CHECKOP_NOTSUPP(ADVLOCK); 375 376 CHECKOP_SUCCESS(ACCESS); 377 CHECKOP_SUCCESS(CLOSE); 378 CHECKOP_SUCCESS(SEEK); 379 380 case VOP_GETPAGES_DESCOFFSET: 381 if (!EXISTSOP(pmp, READ)) 382 return genfs_eopnotsupp(v); 383 break; 384 385 default: 386 panic("puffs_checkop: unhandled vnop %d", 387 desc->vdesc_offset); 388 } 389 } 390 391 rv = VOCALL(puffs_msgop_p, ap->a_desc->vdesc_offset, v); 392 393 DPRINTF_VERBOSE(("checkop return %s (%d), vp %p: %d\n", 394 ap->a_desc->vdesc_name, ap->a_desc->vdesc_offset, vp, rv)); 395 396 return rv; 397 } 398 399 static int callremove(struct puffs_mount *, puffs_cookie_t, puffs_cookie_t, 400 struct componentname *); 401 static int callrmdir(struct puffs_mount *, puffs_cookie_t, puffs_cookie_t, 402 struct componentname *); 403 static void callinactive(struct puffs_mount *, puffs_cookie_t, int); 404 static void callreclaim(struct puffs_mount *, puffs_cookie_t); 405 406 #define PUFFS_ABORT_LOOKUP 1 407 #define PUFFS_ABORT_CREATE 2 408 #define PUFFS_ABORT_MKNOD 3 409 #define PUFFS_ABORT_MKDIR 4 410 #define PUFFS_ABORT_SYMLINK 5 411 412 /* 413 * Press the pani^Wabort button! Kernel resource allocation failed. 414 */ 415 static void 416 puffs_abortbutton(struct puffs_mount *pmp, int what, 417 puffs_cookie_t dck, puffs_cookie_t ck, struct componentname *cnp) 418 { 419 420 switch (what) { 421 case PUFFS_ABORT_CREATE: 422 case PUFFS_ABORT_MKNOD: 423 case PUFFS_ABORT_SYMLINK: 424 callremove(pmp, dck, ck, cnp); 425 break; 426 case PUFFS_ABORT_MKDIR: 427 callrmdir(pmp, dck, ck, cnp); 428 break; 429 } 430 431 callinactive(pmp, ck, 0); 432 callreclaim(pmp, ck); 433 } 434 435 /* 436 * Begin vnode operations. 437 * 438 * A word from the keymaster about locks: generally we don't want 439 * to use the vnode locks at all: it creates an ugly dependency between 440 * the userlandia file server and the kernel. But we'll play along with 441 * the kernel vnode locks for now. However, even currently we attempt 442 * to release locks as early as possible. This is possible for some 443 * operations which a) don't need a locked vnode after the userspace op 444 * and b) return with the vnode unlocked. Theoretically we could 445 * unlock-do op-lock for others and order the graph in userspace, but I 446 * don't want to think of the consequences for the time being. 447 */ 448 449 int 450 puffs_vnop_lookup(void *v) 451 { 452 struct vop_lookup_args /* { 453 const struct vnodeop_desc *a_desc; 454 struct vnode *a_dvp; 455 struct vnode **a_vpp; 456 struct componentname *a_cnp; 457 } */ *ap = v; 458 PUFFS_MSG_VARS(vn, lookup); 459 struct puffs_mount *pmp; 460 struct componentname *cnp; 461 struct vnode *vp, *dvp; 462 struct puffs_node *dpn; 463 int isdot; 464 int error; 465 466 pmp = MPTOPUFFSMP(ap->a_dvp->v_mount); 467 cnp = ap->a_cnp; 468 dvp = ap->a_dvp; 469 *ap->a_vpp = NULL; 470 471 /* r/o fs? we check create later to handle EEXIST */ 472 if ((cnp->cn_flags & ISLASTCN) 473 && (dvp->v_mount->mnt_flag & MNT_RDONLY) 474 && (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 475 return EROFS; 476 477 isdot = cnp->cn_namelen == 1 && *cnp->cn_nameptr == '.'; 478 479 DPRINTF(("puffs_lookup: \"%s\", parent vnode %p, op: %x\n", 480 cnp->cn_nameptr, dvp, cnp->cn_nameiop)); 481 482 /* 483 * Check if someone fed it into the cache 484 */ 485 if (PUFFS_USE_NAMECACHE(pmp)) { 486 error = cache_lookup(dvp, ap->a_vpp, cnp); 487 488 if (error >= 0) 489 return error; 490 } 491 492 if (isdot) { 493 vp = ap->a_dvp; 494 vref(vp); 495 *ap->a_vpp = vp; 496 return 0; 497 } 498 499 PUFFS_MSG_ALLOC(vn, lookup); 500 puffs_makecn(&lookup_msg->pvnr_cn, &lookup_msg->pvnr_cn_cred, 501 cnp, PUFFS_USE_FULLPNBUF(pmp)); 502 503 if (cnp->cn_flags & ISDOTDOT) 504 VOP_UNLOCK(dvp, 0); 505 506 puffs_msg_setinfo(park_lookup, PUFFSOP_VN, 507 PUFFS_VN_LOOKUP, VPTOPNC(dvp)); 508 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_lookup, dvp->v_data, NULL, error); 509 DPRINTF(("puffs_lookup: return of the userspace, part %d\n", error)); 510 511 /* 512 * In case of error, there is no new vnode to play with, so be 513 * happy with the NULL value given to vpp in the beginning. 514 * Also, check if this really was an error or the target was not 515 * present. Either treat it as a non-error for CREATE/RENAME or 516 * enter the component into the negative name cache (if desired). 517 */ 518 if (error) { 519 error = checkerr(pmp, error, __func__); 520 if (error == ENOENT) { 521 /* don't allow to create files on r/o fs */ 522 if ((dvp->v_mount->mnt_flag & MNT_RDONLY) 523 && cnp->cn_nameiop == CREATE) { 524 error = EROFS; 525 526 /* adjust values if we are creating */ 527 } else if ((cnp->cn_flags & ISLASTCN) 528 && (cnp->cn_nameiop == CREATE 529 || cnp->cn_nameiop == RENAME)) { 530 cnp->cn_flags |= SAVENAME; 531 error = EJUSTRETURN; 532 533 /* save negative cache entry */ 534 } else { 535 if ((cnp->cn_flags & MAKEENTRY) 536 && PUFFS_USE_NAMECACHE(pmp)) 537 cache_enter(dvp, NULL, cnp); 538 } 539 } 540 goto out; 541 } 542 543 /* 544 * Check that we don't get our parent node back, that would cause 545 * a pretty obvious deadlock. 546 */ 547 dpn = dvp->v_data; 548 if (lookup_msg->pvnr_newnode == dpn->pn_cookie) { 549 puffs_senderr(pmp, PUFFS_ERR_LOOKUP, EINVAL, 550 "lookup produced parent cookie", lookup_msg->pvnr_newnode); 551 error = EPROTO; 552 goto out; 553 } 554 555 error = puffs_cookie2vnode(pmp, lookup_msg->pvnr_newnode, 1, 1, &vp); 556 if (error == PUFFS_NOSUCHCOOKIE) { 557 error = puffs_getvnode(dvp->v_mount, 558 lookup_msg->pvnr_newnode, lookup_msg->pvnr_vtype, 559 lookup_msg->pvnr_size, lookup_msg->pvnr_rdev, &vp); 560 if (error) { 561 puffs_abortbutton(pmp, PUFFS_ABORT_LOOKUP, VPTOPNC(dvp), 562 lookup_msg->pvnr_newnode, ap->a_cnp); 563 goto out; 564 } 565 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 566 } else if (error) { 567 puffs_abortbutton(pmp, PUFFS_ABORT_LOOKUP, VPTOPNC(dvp), 568 lookup_msg->pvnr_newnode, ap->a_cnp); 569 goto out; 570 } 571 572 *ap->a_vpp = vp; 573 574 if ((cnp->cn_flags & MAKEENTRY) != 0 && PUFFS_USE_NAMECACHE(pmp)) 575 cache_enter(dvp, vp, cnp); 576 577 /* XXX */ 578 if ((lookup_msg->pvnr_cn.pkcn_flags & REQUIREDIR) == 0) 579 cnp->cn_flags &= ~REQUIREDIR; 580 if (lookup_msg->pvnr_cn.pkcn_consume) 581 cnp->cn_consume = MIN(lookup_msg->pvnr_cn.pkcn_consume, 582 strlen(cnp->cn_nameptr) - cnp->cn_namelen); 583 584 out: 585 if (cnp->cn_flags & ISDOTDOT) 586 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 587 588 DPRINTF(("puffs_lookup: returning %d %p\n", error, *ap->a_vpp)); 589 PUFFS_MSG_RELEASE(lookup); 590 return error; 591 } 592 593 #define REFPN_AND_UNLOCKVP(a, b) \ 594 do { \ 595 mutex_enter(&b->pn_mtx); \ 596 puffs_referencenode(b); \ 597 mutex_exit(&b->pn_mtx); \ 598 VOP_UNLOCK(a, 0); \ 599 } while (/*CONSTCOND*/0) 600 601 #define REFPN(b) \ 602 do { \ 603 mutex_enter(&b->pn_mtx); \ 604 puffs_referencenode(b); \ 605 mutex_exit(&b->pn_mtx); \ 606 } while (/*CONSTCOND*/0) 607 608 #define RELEPN_AND_VP(a, b) \ 609 do { \ 610 puffs_releasenode(b); \ 611 vrele(a); \ 612 } while (/*CONSTCOND*/0) 613 614 int 615 puffs_vnop_create(void *v) 616 { 617 struct vop_create_args /* { 618 const struct vnodeop_desc *a_desc; 619 struct vnode *a_dvp; 620 struct vnode **a_vpp; 621 struct componentname *a_cnp; 622 struct vattr *a_vap; 623 } */ *ap = v; 624 PUFFS_MSG_VARS(vn, create); 625 struct vnode *dvp = ap->a_dvp; 626 struct puffs_node *dpn = VPTOPP(dvp); 627 struct componentname *cnp = ap->a_cnp; 628 struct mount *mp = dvp->v_mount; 629 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 630 int error; 631 632 DPRINTF(("puffs_create: dvp %p, cnp: %s\n", 633 dvp, ap->a_cnp->cn_nameptr)); 634 635 PUFFS_MSG_ALLOC(vn, create); 636 puffs_makecn(&create_msg->pvnr_cn, &create_msg->pvnr_cn_cred, 637 cnp, PUFFS_USE_FULLPNBUF(pmp)); 638 create_msg->pvnr_va = *ap->a_vap; 639 puffs_msg_setinfo(park_create, PUFFSOP_VN, 640 PUFFS_VN_CREATE, VPTOPNC(dvp)); 641 642 /* 643 * Do the dance: 644 * + insert into queue ("interlock") 645 * + unlock vnode 646 * + wait for response 647 */ 648 puffs_msg_enqueue(pmp, park_create); 649 REFPN_AND_UNLOCKVP(dvp, dpn); 650 error = puffs_msg_wait2(pmp, park_create, dpn, NULL); 651 652 error = checkerr(pmp, error, __func__); 653 if (error) 654 goto out; 655 656 error = puffs_newnode(mp, dvp, ap->a_vpp, 657 create_msg->pvnr_newnode, cnp, ap->a_vap->va_type, 0); 658 if (error) 659 puffs_abortbutton(pmp, PUFFS_ABORT_CREATE, dpn->pn_cookie, 660 create_msg->pvnr_newnode, cnp); 661 662 out: 663 if (error || (cnp->cn_flags & SAVESTART) == 0) 664 PNBUF_PUT(cnp->cn_pnbuf); 665 666 RELEPN_AND_VP(dvp, dpn); 667 DPRINTF(("puffs_create: return %d\n", error)); 668 PUFFS_MSG_RELEASE(create); 669 return error; 670 } 671 672 int 673 puffs_vnop_mknod(void *v) 674 { 675 struct vop_mknod_args /* { 676 const struct vnodeop_desc *a_desc; 677 struct vnode *a_dvp; 678 struct vnode **a_vpp; 679 struct componentname *a_cnp; 680 struct vattr *a_vap; 681 } */ *ap = v; 682 PUFFS_MSG_VARS(vn, mknod); 683 struct vnode *dvp = ap->a_dvp; 684 struct puffs_node *dpn = VPTOPP(dvp); 685 struct componentname *cnp = ap->a_cnp; 686 struct mount *mp = dvp->v_mount; 687 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 688 int error; 689 690 PUFFS_MSG_ALLOC(vn, mknod); 691 puffs_makecn(&mknod_msg->pvnr_cn, &mknod_msg->pvnr_cn_cred, 692 cnp, PUFFS_USE_FULLPNBUF(pmp)); 693 mknod_msg->pvnr_va = *ap->a_vap; 694 puffs_msg_setinfo(park_mknod, PUFFSOP_VN, 695 PUFFS_VN_MKNOD, VPTOPNC(dvp)); 696 697 puffs_msg_enqueue(pmp, park_mknod); 698 REFPN_AND_UNLOCKVP(dvp, dpn); 699 error = puffs_msg_wait2(pmp, park_mknod, dpn, NULL); 700 701 error = checkerr(pmp, error, __func__); 702 if (error) 703 goto out; 704 705 error = puffs_newnode(mp, dvp, ap->a_vpp, 706 mknod_msg->pvnr_newnode, cnp, ap->a_vap->va_type, 707 ap->a_vap->va_rdev); 708 if (error) 709 puffs_abortbutton(pmp, PUFFS_ABORT_MKNOD, dpn->pn_cookie, 710 mknod_msg->pvnr_newnode, cnp); 711 712 out: 713 PUFFS_MSG_RELEASE(mknod); 714 if (error || (cnp->cn_flags & SAVESTART) == 0) 715 PNBUF_PUT(cnp->cn_pnbuf); 716 RELEPN_AND_VP(dvp, dpn); 717 return error; 718 } 719 720 int 721 puffs_vnop_open(void *v) 722 { 723 struct vop_open_args /* { 724 const struct vnodeop_desc *a_desc; 725 struct vnode *a_vp; 726 int a_mode; 727 kauth_cred_t a_cred; 728 } */ *ap = v; 729 PUFFS_MSG_VARS(vn, open); 730 struct vnode *vp = ap->a_vp; 731 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 732 int mode = ap->a_mode; 733 int error; 734 735 DPRINTF(("puffs_open: vp %p, mode 0x%x\n", vp, mode)); 736 737 if (vp->v_type == VREG && mode & FWRITE && !EXISTSOP(pmp, WRITE)) 738 ERROUT(EROFS); 739 740 if (!EXISTSOP(pmp, OPEN)) 741 ERROUT(0); 742 743 PUFFS_MSG_ALLOC(vn, open); 744 open_msg->pvnr_mode = mode; 745 puffs_credcvt(&open_msg->pvnr_cred, ap->a_cred); 746 puffs_msg_setinfo(park_open, PUFFSOP_VN, 747 PUFFS_VN_OPEN, VPTOPNC(vp)); 748 749 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_open, vp->v_data, NULL, error); 750 error = checkerr(pmp, error, __func__); 751 752 out: 753 DPRINTF(("puffs_open: returning %d\n", error)); 754 PUFFS_MSG_RELEASE(open); 755 return error; 756 } 757 758 int 759 puffs_vnop_close(void *v) 760 { 761 struct vop_close_args /* { 762 const struct vnodeop_desc *a_desc; 763 struct vnode *a_vp; 764 int a_fflag; 765 kauth_cred_t a_cred; 766 } */ *ap = v; 767 PUFFS_MSG_VARS(vn, close); 768 struct vnode *vp = ap->a_vp; 769 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 770 771 PUFFS_MSG_ALLOC(vn, close); 772 puffs_msg_setfaf(park_close); 773 close_msg->pvnr_fflag = ap->a_fflag; 774 puffs_credcvt(&close_msg->pvnr_cred, ap->a_cred); 775 puffs_msg_setinfo(park_close, PUFFSOP_VN, 776 PUFFS_VN_CLOSE, VPTOPNC(vp)); 777 778 puffs_msg_enqueue(pmp, park_close); 779 PUFFS_MSG_RELEASE(close); 780 return 0; 781 } 782 783 int 784 puffs_vnop_access(void *v) 785 { 786 struct vop_access_args /* { 787 const struct vnodeop_desc *a_desc; 788 struct vnode *a_vp; 789 int a_mode; 790 kauth_cred_t a_cred; 791 } */ *ap = v; 792 PUFFS_MSG_VARS(vn, access); 793 struct vnode *vp = ap->a_vp; 794 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 795 int mode = ap->a_mode; 796 int error; 797 798 if (mode & VWRITE) { 799 switch (vp->v_type) { 800 case VDIR: 801 case VLNK: 802 case VREG: 803 if ((vp->v_mount->mnt_flag & MNT_RDONLY) 804 || !EXISTSOP(pmp, WRITE)) 805 return EROFS; 806 break; 807 default: 808 break; 809 } 810 } 811 812 if (!EXISTSOP(pmp, ACCESS)) 813 return 0; 814 815 PUFFS_MSG_ALLOC(vn, access); 816 access_msg->pvnr_mode = ap->a_mode; 817 puffs_credcvt(&access_msg->pvnr_cred, ap->a_cred); 818 puffs_msg_setinfo(park_access, PUFFSOP_VN, 819 PUFFS_VN_ACCESS, VPTOPNC(vp)); 820 821 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_access, vp->v_data, NULL, error); 822 error = checkerr(pmp, error, __func__); 823 PUFFS_MSG_RELEASE(access); 824 825 return error; 826 } 827 828 int 829 puffs_vnop_getattr(void *v) 830 { 831 struct vop_getattr_args /* { 832 const struct vnodeop_desc *a_desc; 833 struct vnode *a_vp; 834 struct vattr *a_vap; 835 kauth_cred_t a_cred; 836 } */ *ap = v; 837 PUFFS_MSG_VARS(vn, getattr); 838 struct vnode *vp = ap->a_vp; 839 struct mount *mp = vp->v_mount; 840 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 841 struct vattr *vap, *rvap; 842 struct puffs_node *pn; 843 int error = 0; 844 845 vap = ap->a_vap; 846 847 PUFFS_MSG_ALLOC(vn, getattr); 848 vattr_null(&getattr_msg->pvnr_va); 849 puffs_credcvt(&getattr_msg->pvnr_cred, ap->a_cred); 850 puffs_msg_setinfo(park_getattr, PUFFSOP_VN, 851 PUFFS_VN_GETATTR, VPTOPNC(vp)); 852 853 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_getattr, vp->v_data, NULL, error); 854 error = checkerr(pmp, error, __func__); 855 if (error) 856 goto out; 857 858 rvap = &getattr_msg->pvnr_va; 859 /* 860 * Don't listen to the file server regarding special device 861 * size info, the file server doesn't know anything about them. 862 */ 863 if (vp->v_type == VBLK || vp->v_type == VCHR) 864 rvap->va_size = vp->v_size; 865 866 /* Ditto for blocksize (ufs comment: this doesn't belong here) */ 867 if (vp->v_type == VBLK) 868 rvap->va_blocksize = BLKDEV_IOSIZE; 869 else if (vp->v_type == VCHR) 870 rvap->va_blocksize = MAXBSIZE; 871 872 (void) memcpy(vap, rvap, sizeof(struct vattr)); 873 vap->va_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 874 875 pn = VPTOPP(vp); 876 if (pn->pn_stat & PNODE_METACACHE_ATIME) 877 vap->va_atime = pn->pn_mc_atime; 878 if (pn->pn_stat & PNODE_METACACHE_CTIME) 879 vap->va_ctime = pn->pn_mc_ctime; 880 if (pn->pn_stat & PNODE_METACACHE_MTIME) 881 vap->va_mtime = pn->pn_mc_mtime; 882 if (pn->pn_stat & PNODE_METACACHE_SIZE) { 883 vap->va_size = pn->pn_mc_size; 884 } else { 885 if (rvap->va_size != VNOVAL 886 && vp->v_type != VBLK && vp->v_type != VCHR) { 887 uvm_vnp_setsize(vp, rvap->va_size); 888 pn->pn_serversize = rvap->va_size; 889 } 890 } 891 892 out: 893 PUFFS_MSG_RELEASE(getattr); 894 return error; 895 } 896 897 static int 898 dosetattr(struct vnode *vp, struct vattr *vap, kauth_cred_t cred, int chsize) 899 { 900 PUFFS_MSG_VARS(vn, setattr); 901 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 902 struct puffs_node *pn = vp->v_data; 903 int error; 904 905 if ((vp->v_mount->mnt_flag & MNT_RDONLY) && 906 (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL 907 || vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL 908 || vap->va_mode != (mode_t)VNOVAL)) 909 return EROFS; 910 911 if ((vp->v_mount->mnt_flag & MNT_RDONLY) 912 && vp->v_type == VREG && vap->va_size != VNOVAL) 913 return EROFS; 914 915 /* 916 * Flush metacache first. If we are called with some explicit 917 * parameters, treat them as information overriding metacache 918 * information. 919 */ 920 if (pn->pn_stat & PNODE_METACACHE_MASK) { 921 if ((pn->pn_stat & PNODE_METACACHE_ATIME) 922 && vap->va_atime.tv_sec == VNOVAL) 923 vap->va_atime = pn->pn_mc_atime; 924 if ((pn->pn_stat & PNODE_METACACHE_CTIME) 925 && vap->va_ctime.tv_sec == VNOVAL) 926 vap->va_ctime = pn->pn_mc_ctime; 927 if ((pn->pn_stat & PNODE_METACACHE_MTIME) 928 && vap->va_mtime.tv_sec == VNOVAL) 929 vap->va_mtime = pn->pn_mc_mtime; 930 if ((pn->pn_stat & PNODE_METACACHE_SIZE) 931 && vap->va_size == VNOVAL) 932 vap->va_size = pn->pn_mc_size; 933 934 pn->pn_stat &= ~PNODE_METACACHE_MASK; 935 } 936 937 PUFFS_MSG_ALLOC(vn, setattr); 938 (void)memcpy(&setattr_msg->pvnr_va, vap, sizeof(struct vattr)); 939 puffs_credcvt(&setattr_msg->pvnr_cred, cred); 940 puffs_msg_setinfo(park_setattr, PUFFSOP_VN, 941 PUFFS_VN_SETATTR, VPTOPNC(vp)); 942 943 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_setattr, vp->v_data, NULL, error); 944 PUFFS_MSG_RELEASE(setattr); 945 error = checkerr(pmp, error, __func__); 946 if (error) 947 return error; 948 949 if (vap->va_size != VNOVAL) { 950 pn->pn_serversize = vap->va_size; 951 if (chsize) 952 uvm_vnp_setsize(vp, vap->va_size); 953 } 954 955 return 0; 956 } 957 958 int 959 puffs_vnop_setattr(void *v) 960 { 961 struct vop_getattr_args /* { 962 const struct vnodeop_desc *a_desc; 963 struct vnode *a_vp; 964 struct vattr *a_vap; 965 kauth_cred_t a_cred; 966 } */ *ap = v; 967 968 return dosetattr(ap->a_vp, ap->a_vap, ap->a_cred, 1); 969 } 970 971 static __inline int 972 doinact(struct puffs_mount *pmp, int iaflag) 973 { 974 975 if (EXISTSOP(pmp, INACTIVE)) 976 if (pmp->pmp_flags & PUFFS_KFLAG_IAONDEMAND) 977 if (iaflag || ALLOPS(pmp)) 978 return 1; 979 else 980 return 0; 981 else 982 return 1; 983 else 984 return 0; 985 } 986 987 static void 988 callinactive(struct puffs_mount *pmp, puffs_cookie_t ck, int iaflag) 989 { 990 int error; 991 PUFFS_MSG_VARS(vn, inactive); 992 993 if (doinact(pmp, iaflag)) { 994 PUFFS_MSG_ALLOC(vn, inactive); 995 puffs_msg_setinfo(park_inactive, PUFFSOP_VN, 996 PUFFS_VN_INACTIVE, ck); 997 998 PUFFS_MSG_ENQUEUEWAIT(pmp, park_inactive, error); 999 PUFFS_MSG_RELEASE(inactive); 1000 } 1001 } 1002 1003 /* XXX: callinactive can't setback */ 1004 int 1005 puffs_vnop_inactive(void *v) 1006 { 1007 struct vop_inactive_args /* { 1008 const struct vnodeop_desc *a_desc; 1009 struct vnode *a_vp; 1010 } */ *ap = v; 1011 PUFFS_MSG_VARS(vn, inactive); 1012 struct vnode *vp = ap->a_vp; 1013 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1014 struct puffs_node *pnode; 1015 int error; 1016 1017 pnode = vp->v_data; 1018 1019 if (doinact(pmp, pnode->pn_stat & PNODE_DOINACT)) { 1020 PUFFS_MSG_ALLOC(vn, inactive); 1021 puffs_msg_setinfo(park_inactive, PUFFSOP_VN, 1022 PUFFS_VN_INACTIVE, VPTOPNC(vp)); 1023 1024 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_inactive, vp->v_data, 1025 NULL, error); 1026 PUFFS_MSG_RELEASE(inactive); 1027 } 1028 pnode->pn_stat &= ~PNODE_DOINACT; 1029 1030 /* 1031 * file server thinks it's gone? then don't be afraid care, 1032 * node's life was already all it would ever be 1033 */ 1034 *ap->a_recycle = ((pnode->pn_stat & PNODE_NOREFS) != 0); 1035 1036 VOP_UNLOCK(vp, 0); 1037 1038 return 0; 1039 } 1040 1041 static void 1042 callreclaim(struct puffs_mount *pmp, puffs_cookie_t ck) 1043 { 1044 PUFFS_MSG_VARS(vn, reclaim); 1045 1046 if (!EXISTSOP(pmp, RECLAIM)) 1047 return; 1048 1049 PUFFS_MSG_ALLOC(vn, reclaim); 1050 puffs_msg_setfaf(park_reclaim); 1051 puffs_msg_setinfo(park_reclaim, PUFFSOP_VN, PUFFS_VN_RECLAIM, ck); 1052 1053 puffs_msg_enqueue(pmp, park_reclaim); 1054 PUFFS_MSG_RELEASE(reclaim); 1055 } 1056 1057 /* 1058 * always FAF, we don't really care if the server wants to fail to 1059 * reclaim the node or not 1060 */ 1061 int 1062 puffs_vnop_reclaim(void *v) 1063 { 1064 struct vop_reclaim_args /* { 1065 const struct vnodeop_desc *a_desc; 1066 struct vnode *a_vp; 1067 } */ *ap = v; 1068 struct vnode *vp = ap->a_vp; 1069 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1070 1071 /* 1072 * first things first: check if someone is trying to reclaim the 1073 * root vnode. do not allow that to travel to userspace. 1074 * Note that we don't need to take the lock similarly to 1075 * puffs_root(), since there is only one of us. 1076 */ 1077 if (vp->v_vflag & VV_ROOT) { 1078 mutex_enter(&pmp->pmp_lock); 1079 KASSERT(pmp->pmp_root != NULL); 1080 pmp->pmp_root = NULL; 1081 mutex_exit(&pmp->pmp_lock); 1082 goto out; 1083 } 1084 1085 callreclaim(MPTOPUFFSMP(vp->v_mount), VPTOPNC(vp)); 1086 1087 out: 1088 if (PUFFS_USE_NAMECACHE(pmp)) 1089 cache_purge(vp); 1090 puffs_putvnode(vp); 1091 1092 return 0; 1093 } 1094 1095 #define CSIZE sizeof(**ap->a_cookies) 1096 int 1097 puffs_vnop_readdir(void *v) 1098 { 1099 struct vop_readdir_args /* { 1100 const struct vnodeop_desc *a_desc; 1101 struct vnode *a_vp; 1102 struct uio *a_uio; 1103 kauth_cred_t a_cred; 1104 int *a_eofflag; 1105 off_t **a_cookies; 1106 int *a_ncookies; 1107 } */ *ap = v; 1108 PUFFS_MSG_VARS(vn, readdir); 1109 struct vnode *vp = ap->a_vp; 1110 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1111 size_t argsize, tomove, cookiemem, cookiesmax; 1112 struct uio *uio = ap->a_uio; 1113 size_t howmuch, resid; 1114 int error; 1115 1116 /* 1117 * ok, so we need: resid + cookiemem = maxreq 1118 * => resid + cookiesize * (resid/minsize) = maxreq 1119 * => resid + cookiesize/minsize * resid = maxreq 1120 * => (cookiesize/minsize + 1) * resid = maxreq 1121 * => resid = maxreq / (cookiesize/minsize + 1) 1122 * 1123 * Since cookiesize <= minsize and we're not very big on floats, 1124 * we approximate that to be 1. Therefore: 1125 * 1126 * resid = maxreq / 2; 1127 * 1128 * Well, at least we didn't have to use differential equations 1129 * or the Gram-Schmidt process. 1130 * 1131 * (yes, I'm very afraid of this) 1132 */ 1133 KASSERT(CSIZE <= _DIRENT_MINSIZE((struct dirent *)0)); 1134 1135 if (ap->a_cookies) { 1136 KASSERT(ap->a_ncookies != NULL); 1137 if (pmp->pmp_args.pa_fhsize == 0) 1138 return EOPNOTSUPP; 1139 resid = PUFFS_TOMOVE(uio->uio_resid, pmp) / 2; 1140 cookiesmax = resid/_DIRENT_MINSIZE((struct dirent *)0); 1141 cookiemem = ALIGN(cookiesmax*CSIZE); /* play safe */ 1142 } else { 1143 resid = PUFFS_TOMOVE(uio->uio_resid, pmp); 1144 cookiesmax = 0; 1145 cookiemem = 0; 1146 } 1147 1148 argsize = sizeof(struct puffs_vnmsg_readdir); 1149 tomove = resid + cookiemem; 1150 puffs_msgmem_alloc(argsize + tomove, &park_readdir, 1151 (void *)&readdir_msg, 1); 1152 1153 puffs_credcvt(&readdir_msg->pvnr_cred, ap->a_cred); 1154 readdir_msg->pvnr_offset = uio->uio_offset; 1155 readdir_msg->pvnr_resid = resid; 1156 readdir_msg->pvnr_ncookies = cookiesmax; 1157 readdir_msg->pvnr_eofflag = 0; 1158 readdir_msg->pvnr_dentoff = cookiemem; 1159 puffs_msg_setinfo(park_readdir, PUFFSOP_VN, 1160 PUFFS_VN_READDIR, VPTOPNC(vp)); 1161 puffs_msg_setdelta(park_readdir, tomove); 1162 1163 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_readdir, vp->v_data, NULL, error); 1164 error = checkerr(pmp, error, __func__); 1165 if (error) 1166 goto out; 1167 1168 /* userspace is cheating? */ 1169 if (readdir_msg->pvnr_resid > resid) { 1170 puffs_senderr(pmp, PUFFS_ERR_READDIR, E2BIG, 1171 "resid grew", VPTOPNC(vp)); 1172 ERROUT(EPROTO); 1173 } 1174 if (readdir_msg->pvnr_ncookies > cookiesmax) { 1175 puffs_senderr(pmp, PUFFS_ERR_READDIR, E2BIG, 1176 "too many cookies", VPTOPNC(vp)); 1177 ERROUT(EPROTO); 1178 } 1179 1180 /* check eof */ 1181 if (readdir_msg->pvnr_eofflag) 1182 *ap->a_eofflag = 1; 1183 1184 /* bouncy-wouncy with the directory data */ 1185 howmuch = resid - readdir_msg->pvnr_resid; 1186 1187 /* force eof if no data was returned (getcwd() needs this) */ 1188 if (howmuch == 0) { 1189 *ap->a_eofflag = 1; 1190 goto out; 1191 } 1192 1193 error = uiomove(readdir_msg->pvnr_data + cookiemem, howmuch, uio); 1194 if (error) 1195 goto out; 1196 1197 /* provide cookies to caller if so desired */ 1198 if (ap->a_cookies) { 1199 *ap->a_cookies = malloc(readdir_msg->pvnr_ncookies*CSIZE, 1200 M_TEMP, M_WAITOK); 1201 *ap->a_ncookies = readdir_msg->pvnr_ncookies; 1202 memcpy(*ap->a_cookies, readdir_msg->pvnr_data, 1203 *ap->a_ncookies*CSIZE); 1204 } 1205 1206 /* next readdir starts here */ 1207 uio->uio_offset = readdir_msg->pvnr_offset; 1208 1209 out: 1210 puffs_msgmem_release(park_readdir); 1211 return error; 1212 } 1213 #undef CSIZE 1214 1215 /* 1216 * poll works by consuming the bitmask in pn_revents. If there are 1217 * events available, poll returns immediately. If not, it issues a 1218 * poll to userspace, selrecords itself and returns with no available 1219 * events. When the file server returns, it executes puffs_parkdone_poll(), 1220 * where available events are added to the bitmask. selnotify() is 1221 * then also executed by that function causing us to enter here again 1222 * and hopefully find the missing bits (unless someone got them first, 1223 * in which case it starts all over again). 1224 */ 1225 int 1226 puffs_vnop_poll(void *v) 1227 { 1228 struct vop_poll_args /* { 1229 const struct vnodeop_desc *a_desc; 1230 struct vnode *a_vp; 1231 int a_events; 1232 } */ *ap = v; 1233 PUFFS_MSG_VARS(vn, poll); 1234 struct vnode *vp = ap->a_vp; 1235 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1236 struct puffs_node *pn = vp->v_data; 1237 int events, error; 1238 1239 if (EXISTSOP(pmp, POLL)) { 1240 mutex_enter(&pn->pn_mtx); 1241 events = pn->pn_revents & ap->a_events; 1242 if (events & ap->a_events) { 1243 pn->pn_revents &= ~ap->a_events; 1244 mutex_exit(&pn->pn_mtx); 1245 1246 return events; 1247 } else { 1248 puffs_referencenode(pn); 1249 mutex_exit(&pn->pn_mtx); 1250 1251 PUFFS_MSG_ALLOC(vn, poll); 1252 poll_msg->pvnr_events = ap->a_events; 1253 puffs_msg_setinfo(park_poll, PUFFSOP_VN, 1254 PUFFS_VN_POLL, VPTOPNC(vp)); 1255 puffs_msg_setcall(park_poll, puffs_parkdone_poll, pn); 1256 selrecord(curlwp, &pn->pn_sel); 1257 1258 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_poll, vp->v_data, 1259 NULL, error); 1260 PUFFS_MSG_RELEASE(poll); 1261 1262 return 0; 1263 } 1264 } else { 1265 return genfs_poll(v); 1266 } 1267 } 1268 1269 int 1270 puffs_vnop_fsync(void *v) 1271 { 1272 struct vop_fsync_args /* { 1273 const struct vnodeop_desc *a_desc; 1274 struct vnode *a_vp; 1275 kauth_cred_t a_cred; 1276 int a_flags; 1277 off_t a_offlo; 1278 off_t a_offhi; 1279 } */ *ap = v; 1280 PUFFS_MSG_VARS(vn, fsync); 1281 struct vnode *vp = ap->a_vp; 1282 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1283 struct puffs_node *pn; 1284 struct vattr va; 1285 int pflags, error, dofaf; 1286 1287 pn = VPTOPP(vp); 1288 1289 /* flush out information from our metacache, see vop_setattr */ 1290 if (pn->pn_stat & PNODE_METACACHE_MASK) { 1291 vattr_null(&va); 1292 error = VOP_SETATTR(vp, &va, FSCRED); 1293 if (error) 1294 return error; 1295 } 1296 1297 /* 1298 * flush pages to avoid being overly dirty 1299 */ 1300 pflags = PGO_CLEANIT; 1301 if (ap->a_flags & FSYNC_WAIT) 1302 pflags |= PGO_SYNCIO; 1303 mutex_enter(&vp->v_interlock); 1304 error = VOP_PUTPAGES(vp, trunc_page(ap->a_offlo), 1305 round_page(ap->a_offhi), pflags); 1306 if (error) 1307 return error; 1308 1309 /* 1310 * HELLO! We exit already here if the user server does not 1311 * support fsync OR if we should call fsync for a node which 1312 * has references neither in the kernel or the fs server. 1313 * Otherwise we continue to issue fsync() forward. 1314 */ 1315 if (!EXISTSOP(pmp, FSYNC)) 1316 return 0; 1317 1318 dofaf = (ap->a_flags & FSYNC_WAIT) == 0 || ap->a_flags == FSYNC_LAZY; 1319 /* 1320 * We abuse VXLOCK to mean "vnode is going to die", so we issue 1321 * only FAFs for those. Otherwise there's a danger of deadlock, 1322 * since the execution context here might be the user server 1323 * doing some operation on another fs, which in turn caused a 1324 * vnode to be reclaimed from the freelist for this fs. 1325 */ 1326 if (dofaf == 0) { 1327 mutex_enter(&vp->v_interlock); 1328 if (vp->v_iflag & VI_XLOCK) 1329 dofaf = 1; 1330 mutex_exit(&vp->v_interlock); 1331 } 1332 1333 PUFFS_MSG_ALLOC(vn, fsync); 1334 if (dofaf) 1335 puffs_msg_setfaf(park_fsync); 1336 1337 puffs_credcvt(&fsync_msg->pvnr_cred, ap->a_cred); 1338 fsync_msg->pvnr_flags = ap->a_flags; 1339 fsync_msg->pvnr_offlo = ap->a_offlo; 1340 fsync_msg->pvnr_offhi = ap->a_offhi; 1341 puffs_msg_setinfo(park_fsync, PUFFSOP_VN, 1342 PUFFS_VN_FSYNC, VPTOPNC(vp)); 1343 1344 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_fsync, vp->v_data, NULL, error); 1345 PUFFS_MSG_RELEASE(fsync); 1346 1347 error = checkerr(pmp, error, __func__); 1348 1349 return error; 1350 } 1351 1352 int 1353 puffs_vnop_seek(void *v) 1354 { 1355 struct vop_seek_args /* { 1356 const struct vnodeop_desc *a_desc; 1357 struct vnode *a_vp; 1358 off_t a_oldoff; 1359 off_t a_newoff; 1360 kauth_cred_t a_cred; 1361 } */ *ap = v; 1362 PUFFS_MSG_VARS(vn, seek); 1363 struct vnode *vp = ap->a_vp; 1364 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1365 int error; 1366 1367 PUFFS_MSG_ALLOC(vn, seek); 1368 seek_msg->pvnr_oldoff = ap->a_oldoff; 1369 seek_msg->pvnr_newoff = ap->a_newoff; 1370 puffs_credcvt(&seek_msg->pvnr_cred, ap->a_cred); 1371 puffs_msg_setinfo(park_seek, PUFFSOP_VN, 1372 PUFFS_VN_SEEK, VPTOPNC(vp)); 1373 1374 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_seek, vp->v_data, NULL, error); 1375 PUFFS_MSG_RELEASE(seek); 1376 return checkerr(pmp, error, __func__); 1377 } 1378 1379 static int 1380 callremove(struct puffs_mount *pmp, puffs_cookie_t dck, puffs_cookie_t ck, 1381 struct componentname *cnp) 1382 { 1383 PUFFS_MSG_VARS(vn, remove); 1384 int error; 1385 1386 PUFFS_MSG_ALLOC(vn, remove); 1387 remove_msg->pvnr_cookie_targ = ck; 1388 puffs_makecn(&remove_msg->pvnr_cn, &remove_msg->pvnr_cn_cred, 1389 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1390 puffs_msg_setinfo(park_remove, PUFFSOP_VN, PUFFS_VN_REMOVE, dck); 1391 1392 PUFFS_MSG_ENQUEUEWAIT(pmp, park_remove, error); 1393 PUFFS_MSG_RELEASE(remove); 1394 1395 return checkerr(pmp, error, __func__); 1396 } 1397 1398 /* 1399 * XXX: can't use callremove now because can't catch setbacks with 1400 * it due to lack of a pnode argument. 1401 */ 1402 int 1403 puffs_vnop_remove(void *v) 1404 { 1405 struct vop_remove_args /* { 1406 const struct vnodeop_desc *a_desc; 1407 struct vnode *a_dvp; 1408 struct vnode *a_vp; 1409 struct componentname *a_cnp; 1410 } */ *ap = v; 1411 PUFFS_MSG_VARS(vn, remove); 1412 struct vnode *dvp = ap->a_dvp; 1413 struct vnode *vp = ap->a_vp; 1414 struct puffs_node *dpn = VPTOPP(dvp); 1415 struct puffs_node *pn = VPTOPP(vp); 1416 struct componentname *cnp = ap->a_cnp; 1417 struct mount *mp = dvp->v_mount; 1418 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 1419 int error; 1420 1421 PUFFS_MSG_ALLOC(vn, remove); 1422 remove_msg->pvnr_cookie_targ = VPTOPNC(vp); 1423 puffs_makecn(&remove_msg->pvnr_cn, &remove_msg->pvnr_cn_cred, 1424 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1425 puffs_msg_setinfo(park_remove, PUFFSOP_VN, 1426 PUFFS_VN_REMOVE, VPTOPNC(dvp)); 1427 1428 puffs_msg_enqueue(pmp, park_remove); 1429 REFPN_AND_UNLOCKVP(dvp, dpn); 1430 if (dvp == vp) 1431 REFPN(pn); 1432 else 1433 REFPN_AND_UNLOCKVP(vp, pn); 1434 error = puffs_msg_wait2(pmp, park_remove, dpn, pn); 1435 1436 PUFFS_MSG_RELEASE(remove); 1437 1438 RELEPN_AND_VP(dvp, dpn); 1439 RELEPN_AND_VP(vp, pn); 1440 1441 error = checkerr(pmp, error, __func__); 1442 return error; 1443 } 1444 1445 int 1446 puffs_vnop_mkdir(void *v) 1447 { 1448 struct vop_mkdir_args /* { 1449 const struct vnodeop_desc *a_desc; 1450 struct vnode *a_dvp; 1451 struct vnode **a_vpp; 1452 struct componentname *a_cnp; 1453 struct vattr *a_vap; 1454 } */ *ap = v; 1455 PUFFS_MSG_VARS(vn, mkdir); 1456 struct vnode *dvp = ap->a_dvp; 1457 struct puffs_node *dpn = VPTOPP(dvp); 1458 struct componentname *cnp = ap->a_cnp; 1459 struct mount *mp = dvp->v_mount; 1460 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 1461 int error; 1462 1463 PUFFS_MSG_ALLOC(vn, mkdir); 1464 puffs_makecn(&mkdir_msg->pvnr_cn, &mkdir_msg->pvnr_cn_cred, 1465 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1466 mkdir_msg->pvnr_va = *ap->a_vap; 1467 puffs_msg_setinfo(park_mkdir, PUFFSOP_VN, 1468 PUFFS_VN_MKDIR, VPTOPNC(dvp)); 1469 1470 puffs_msg_enqueue(pmp, park_mkdir); 1471 REFPN_AND_UNLOCKVP(dvp, dpn); 1472 error = puffs_msg_wait2(pmp, park_mkdir, dpn, NULL); 1473 1474 error = checkerr(pmp, error, __func__); 1475 if (error) 1476 goto out; 1477 1478 error = puffs_newnode(mp, dvp, ap->a_vpp, 1479 mkdir_msg->pvnr_newnode, cnp, VDIR, 0); 1480 if (error) 1481 puffs_abortbutton(pmp, PUFFS_ABORT_MKDIR, dpn->pn_cookie, 1482 mkdir_msg->pvnr_newnode, cnp); 1483 1484 out: 1485 PUFFS_MSG_RELEASE(mkdir); 1486 if (error || (cnp->cn_flags & SAVESTART) == 0) 1487 PNBUF_PUT(cnp->cn_pnbuf); 1488 RELEPN_AND_VP(dvp, dpn); 1489 return error; 1490 } 1491 1492 static int 1493 callrmdir(struct puffs_mount *pmp, puffs_cookie_t dck, puffs_cookie_t ck, 1494 struct componentname *cnp) 1495 { 1496 PUFFS_MSG_VARS(vn, rmdir); 1497 int error; 1498 1499 PUFFS_MSG_ALLOC(vn, rmdir); 1500 rmdir_msg->pvnr_cookie_targ = ck; 1501 puffs_makecn(&rmdir_msg->pvnr_cn, &rmdir_msg->pvnr_cn_cred, 1502 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1503 puffs_msg_setinfo(park_rmdir, PUFFSOP_VN, PUFFS_VN_RMDIR, dck); 1504 1505 PUFFS_MSG_ENQUEUEWAIT(pmp, park_rmdir, error); 1506 PUFFS_MSG_RELEASE(rmdir); 1507 1508 return checkerr(pmp, error, __func__); 1509 } 1510 1511 int 1512 puffs_vnop_rmdir(void *v) 1513 { 1514 struct vop_rmdir_args /* { 1515 const struct vnodeop_desc *a_desc; 1516 struct vnode *a_dvp; 1517 struct vnode *a_vp; 1518 struct componentname *a_cnp; 1519 } */ *ap = v; 1520 PUFFS_MSG_VARS(vn, rmdir); 1521 struct vnode *dvp = ap->a_dvp; 1522 struct vnode *vp = ap->a_vp; 1523 struct puffs_node *dpn = VPTOPP(dvp); 1524 struct puffs_node *pn = VPTOPP(vp); 1525 struct puffs_mount *pmp = MPTOPUFFSMP(dvp->v_mount); 1526 struct componentname *cnp = ap->a_cnp; 1527 int error; 1528 1529 PUFFS_MSG_ALLOC(vn, rmdir); 1530 rmdir_msg->pvnr_cookie_targ = VPTOPNC(vp); 1531 puffs_makecn(&rmdir_msg->pvnr_cn, &rmdir_msg->pvnr_cn_cred, 1532 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1533 puffs_msg_setinfo(park_rmdir, PUFFSOP_VN, 1534 PUFFS_VN_RMDIR, VPTOPNC(dvp)); 1535 1536 puffs_msg_enqueue(pmp, park_rmdir); 1537 REFPN_AND_UNLOCKVP(dvp, dpn); 1538 REFPN_AND_UNLOCKVP(vp, pn); 1539 error = puffs_msg_wait2(pmp, park_rmdir, dpn, pn); 1540 1541 PUFFS_MSG_RELEASE(rmdir); 1542 1543 /* XXX: some call cache_purge() *for both vnodes* here, investigate */ 1544 RELEPN_AND_VP(dvp, dpn); 1545 RELEPN_AND_VP(vp, pn); 1546 1547 return error; 1548 } 1549 1550 int 1551 puffs_vnop_link(void *v) 1552 { 1553 struct vop_link_args /* { 1554 const struct vnodeop_desc *a_desc; 1555 struct vnode *a_dvp; 1556 struct vnode *a_vp; 1557 struct componentname *a_cnp; 1558 } */ *ap = v; 1559 PUFFS_MSG_VARS(vn, link); 1560 struct vnode *dvp = ap->a_dvp; 1561 struct vnode *vp = ap->a_vp; 1562 struct puffs_node *dpn = VPTOPP(dvp); 1563 struct puffs_node *pn = VPTOPP(vp); 1564 struct puffs_mount *pmp = MPTOPUFFSMP(dvp->v_mount); 1565 struct componentname *cnp = ap->a_cnp; 1566 int error; 1567 1568 PUFFS_MSG_ALLOC(vn, link); 1569 link_msg->pvnr_cookie_targ = VPTOPNC(vp); 1570 puffs_makecn(&link_msg->pvnr_cn, &link_msg->pvnr_cn_cred, 1571 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1572 puffs_msg_setinfo(park_link, PUFFSOP_VN, 1573 PUFFS_VN_LINK, VPTOPNC(dvp)); 1574 1575 puffs_msg_enqueue(pmp, park_link); 1576 REFPN_AND_UNLOCKVP(dvp, dpn); 1577 REFPN(pn); 1578 error = puffs_msg_wait2(pmp, park_link, dpn, pn); 1579 1580 PUFFS_MSG_RELEASE(link); 1581 1582 error = checkerr(pmp, error, __func__); 1583 1584 /* 1585 * XXX: stay in touch with the cache. I don't like this, but 1586 * don't have a better solution either. See also puffs_rename(). 1587 */ 1588 if (error == 0) 1589 puffs_updatenode(pn, PUFFS_UPDATECTIME, 0); 1590 1591 PNBUF_PUT(cnp->cn_pnbuf); 1592 RELEPN_AND_VP(dvp, dpn); 1593 puffs_releasenode(pn); 1594 1595 return error; 1596 } 1597 1598 int 1599 puffs_vnop_symlink(void *v) 1600 { 1601 struct vop_symlink_args /* { 1602 const struct vnodeop_desc *a_desc; 1603 struct vnode *a_dvp; 1604 struct vnode **a_vpp; 1605 struct componentname *a_cnp; 1606 struct vattr *a_vap; 1607 char *a_target; 1608 } */ *ap = v; 1609 PUFFS_MSG_VARS(vn, symlink); 1610 struct vnode *dvp = ap->a_dvp; 1611 struct puffs_node *dpn = VPTOPP(dvp); 1612 struct mount *mp = dvp->v_mount; 1613 struct puffs_mount *pmp = MPTOPUFFSMP(dvp->v_mount); 1614 struct componentname *cnp = ap->a_cnp; 1615 int error; 1616 1617 *ap->a_vpp = NULL; 1618 1619 PUFFS_MSG_ALLOC(vn, symlink); 1620 puffs_makecn(&symlink_msg->pvnr_cn, &symlink_msg->pvnr_cn_cred, 1621 cnp, PUFFS_USE_FULLPNBUF(pmp)); 1622 symlink_msg->pvnr_va = *ap->a_vap; 1623 (void)strlcpy(symlink_msg->pvnr_link, ap->a_target, 1624 sizeof(symlink_msg->pvnr_link)); 1625 puffs_msg_setinfo(park_symlink, PUFFSOP_VN, 1626 PUFFS_VN_SYMLINK, VPTOPNC(dvp)); 1627 1628 puffs_msg_enqueue(pmp, park_symlink); 1629 REFPN_AND_UNLOCKVP(dvp, dpn); 1630 error = puffs_msg_wait2(pmp, park_symlink, dpn, NULL); 1631 1632 error = checkerr(pmp, error, __func__); 1633 if (error) 1634 goto out; 1635 1636 error = puffs_newnode(mp, dvp, ap->a_vpp, 1637 symlink_msg->pvnr_newnode, cnp, VLNK, 0); 1638 if (error) 1639 puffs_abortbutton(pmp, PUFFS_ABORT_SYMLINK, dpn->pn_cookie, 1640 symlink_msg->pvnr_newnode, cnp); 1641 1642 out: 1643 PUFFS_MSG_RELEASE(symlink); 1644 if (error || (cnp->cn_flags & SAVESTART) == 0) 1645 PNBUF_PUT(cnp->cn_pnbuf); 1646 RELEPN_AND_VP(dvp, dpn); 1647 1648 return error; 1649 } 1650 1651 int 1652 puffs_vnop_readlink(void *v) 1653 { 1654 struct vop_readlink_args /* { 1655 const struct vnodeop_desc *a_desc; 1656 struct vnode *a_vp; 1657 struct uio *a_uio; 1658 kauth_cred_t a_cred; 1659 } */ *ap = v; 1660 PUFFS_MSG_VARS(vn, readlink); 1661 struct vnode *vp = ap->a_vp; 1662 struct puffs_mount *pmp = MPTOPUFFSMP(ap->a_vp->v_mount); 1663 size_t linklen; 1664 int error; 1665 1666 PUFFS_MSG_ALLOC(vn, readlink); 1667 puffs_credcvt(&readlink_msg->pvnr_cred, ap->a_cred); 1668 linklen = sizeof(readlink_msg->pvnr_link); 1669 readlink_msg->pvnr_linklen = linklen; 1670 puffs_msg_setinfo(park_readlink, PUFFSOP_VN, 1671 PUFFS_VN_READLINK, VPTOPNC(vp)); 1672 1673 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_readlink, vp->v_data, NULL, error); 1674 error = checkerr(pmp, error, __func__); 1675 if (error) 1676 goto out; 1677 1678 /* bad bad user file server */ 1679 if (readlink_msg->pvnr_linklen > linklen) { 1680 puffs_senderr(pmp, PUFFS_ERR_READLINK, E2BIG, 1681 "linklen too big", VPTOPNC(ap->a_vp)); 1682 error = EPROTO; 1683 goto out; 1684 } 1685 1686 error = uiomove(&readlink_msg->pvnr_link, readlink_msg->pvnr_linklen, 1687 ap->a_uio); 1688 out: 1689 PUFFS_MSG_RELEASE(readlink); 1690 return error; 1691 } 1692 1693 int 1694 puffs_vnop_rename(void *v) 1695 { 1696 struct vop_rename_args /* { 1697 const struct vnodeop_desc *a_desc; 1698 struct vnode *a_fdvp; 1699 struct vnode *a_fvp; 1700 struct componentname *a_fcnp; 1701 struct vnode *a_tdvp; 1702 struct vnode *a_tvp; 1703 struct componentname *a_tcnp; 1704 } */ *ap = v; 1705 PUFFS_MSG_VARS(vn, rename); 1706 struct vnode *fdvp = ap->a_fdvp; 1707 struct puffs_node *fpn = ap->a_fvp->v_data; 1708 struct puffs_mount *pmp = MPTOPUFFSMP(fdvp->v_mount); 1709 int error; 1710 1711 if (ap->a_fvp->v_mount != ap->a_tdvp->v_mount) 1712 ERROUT(EXDEV); 1713 1714 PUFFS_MSG_ALLOC(vn, rename); 1715 rename_msg->pvnr_cookie_src = VPTOPNC(ap->a_fvp); 1716 rename_msg->pvnr_cookie_targdir = VPTOPNC(ap->a_tdvp); 1717 if (ap->a_tvp) 1718 rename_msg->pvnr_cookie_targ = VPTOPNC(ap->a_tvp); 1719 else 1720 rename_msg->pvnr_cookie_targ = NULL; 1721 puffs_makecn(&rename_msg->pvnr_cn_src, &rename_msg->pvnr_cn_src_cred, 1722 ap->a_fcnp, PUFFS_USE_FULLPNBUF(pmp)); 1723 puffs_makecn(&rename_msg->pvnr_cn_targ, &rename_msg->pvnr_cn_targ_cred, 1724 ap->a_tcnp, PUFFS_USE_FULLPNBUF(pmp)); 1725 puffs_msg_setinfo(park_rename, PUFFSOP_VN, 1726 PUFFS_VN_RENAME, VPTOPNC(fdvp)); 1727 1728 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_rename, fdvp->v_data, NULL, error); 1729 error = checkerr(pmp, error, __func__); 1730 1731 /* 1732 * XXX: stay in touch with the cache. I don't like this, but 1733 * don't have a better solution either. See also puffs_link(). 1734 */ 1735 if (error == 0) 1736 puffs_updatenode(fpn, PUFFS_UPDATECTIME, 0); 1737 1738 out: 1739 PUFFS_MSG_RELEASE(rename); 1740 if (ap->a_tvp != NULL) 1741 vput(ap->a_tvp); 1742 if (ap->a_tdvp == ap->a_tvp) 1743 vrele(ap->a_tdvp); 1744 else 1745 vput(ap->a_tdvp); 1746 1747 vrele(ap->a_fdvp); 1748 vrele(ap->a_fvp); 1749 1750 return error; 1751 } 1752 1753 #define RWARGS(cont, iofl, move, offset, creds) \ 1754 (cont)->pvnr_ioflag = (iofl); \ 1755 (cont)->pvnr_resid = (move); \ 1756 (cont)->pvnr_offset = (offset); \ 1757 puffs_credcvt(&(cont)->pvnr_cred, creds) 1758 1759 int 1760 puffs_vnop_read(void *v) 1761 { 1762 struct vop_read_args /* { 1763 const struct vnodeop_desc *a_desc; 1764 struct vnode *a_vp; 1765 struct uio *a_uio; 1766 int a_ioflag; 1767 kauth_cred_t a_cred; 1768 } */ *ap = v; 1769 PUFFS_MSG_VARS(vn, read); 1770 struct vnode *vp = ap->a_vp; 1771 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1772 struct uio *uio = ap->a_uio; 1773 size_t tomove, argsize; 1774 vsize_t bytelen; 1775 int error; 1776 1777 read_msg = NULL; 1778 error = 0; 1779 1780 /* std sanity */ 1781 if (uio->uio_resid == 0) 1782 return 0; 1783 if (uio->uio_offset < 0) 1784 return EINVAL; 1785 1786 if (vp->v_type == VREG && PUFFS_USE_PAGECACHE(pmp)) { 1787 const int advice = IO_ADV_DECODE(ap->a_ioflag); 1788 1789 while (uio->uio_resid > 0) { 1790 bytelen = MIN(uio->uio_resid, 1791 vp->v_size - uio->uio_offset); 1792 if (bytelen == 0) 1793 break; 1794 1795 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice, 1796 UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); 1797 if (error) 1798 break; 1799 } 1800 1801 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1802 puffs_updatenode(VPTOPP(vp), PUFFS_UPDATEATIME, 0); 1803 } else { 1804 /* 1805 * in case it's not a regular file or we're operating 1806 * uncached, do read in the old-fashioned style, 1807 * i.e. explicit read operations 1808 */ 1809 1810 tomove = PUFFS_TOMOVE(uio->uio_resid, pmp); 1811 argsize = sizeof(struct puffs_vnmsg_read); 1812 puffs_msgmem_alloc(argsize + tomove, &park_read, 1813 (void *)&read_msg, 1); 1814 1815 error = 0; 1816 while (uio->uio_resid > 0) { 1817 tomove = PUFFS_TOMOVE(uio->uio_resid, pmp); 1818 memset(read_msg, 0, argsize); /* XXX: touser KASSERT */ 1819 RWARGS(read_msg, ap->a_ioflag, tomove, 1820 uio->uio_offset, ap->a_cred); 1821 puffs_msg_setinfo(park_read, PUFFSOP_VN, 1822 PUFFS_VN_READ, VPTOPNC(vp)); 1823 puffs_msg_setdelta(park_read, tomove); 1824 1825 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_read, vp->v_data, 1826 NULL, error); 1827 error = checkerr(pmp, error, __func__); 1828 if (error) 1829 break; 1830 1831 if (read_msg->pvnr_resid > tomove) { 1832 puffs_senderr(pmp, PUFFS_ERR_READ, 1833 E2BIG, "resid grew", VPTOPNC(ap->a_vp)); 1834 error = EPROTO; 1835 break; 1836 } 1837 1838 error = uiomove(read_msg->pvnr_data, 1839 tomove - read_msg->pvnr_resid, uio); 1840 1841 /* 1842 * in case the file is out of juice, resid from 1843 * userspace is != 0. and the error-case is 1844 * quite obvious 1845 */ 1846 if (error || read_msg->pvnr_resid) 1847 break; 1848 } 1849 1850 puffs_msgmem_release(park_read); 1851 } 1852 1853 return error; 1854 } 1855 1856 /* 1857 * XXX: in case of a failure, this leaves uio in a bad state. 1858 * We could theoretically copy the uio and iovecs and "replay" 1859 * them the right amount after the userspace trip, but don't 1860 * bother for now. 1861 */ 1862 int 1863 puffs_vnop_write(void *v) 1864 { 1865 struct vop_write_args /* { 1866 const struct vnodeop_desc *a_desc; 1867 struct vnode *a_vp; 1868 struct uio *a_uio; 1869 int a_ioflag; 1870 kauth_cred_t a_cred; 1871 } */ *ap = v; 1872 PUFFS_MSG_VARS(vn, write); 1873 struct vnode *vp = ap->a_vp; 1874 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 1875 struct uio *uio = ap->a_uio; 1876 size_t tomove, argsize; 1877 off_t oldoff, newoff, origoff; 1878 vsize_t bytelen; 1879 int error, uflags; 1880 int ubcflags; 1881 1882 error = uflags = 0; 1883 write_msg = NULL; 1884 1885 if (vp->v_type == VREG && PUFFS_USE_PAGECACHE(pmp)) { 1886 ubcflags = UBC_WRITE | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp); 1887 1888 /* 1889 * userspace *should* be allowed to control this, 1890 * but with UBC it's a bit unclear how to handle it 1891 */ 1892 if (ap->a_ioflag & IO_APPEND) 1893 uio->uio_offset = vp->v_size; 1894 1895 origoff = uio->uio_offset; 1896 while (uio->uio_resid > 0) { 1897 uflags |= PUFFS_UPDATECTIME; 1898 uflags |= PUFFS_UPDATEMTIME; 1899 oldoff = uio->uio_offset; 1900 bytelen = uio->uio_resid; 1901 1902 newoff = oldoff + bytelen; 1903 if (vp->v_size < newoff) { 1904 uvm_vnp_setwritesize(vp, newoff); 1905 } 1906 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, 1907 UVM_ADV_RANDOM, ubcflags); 1908 1909 /* 1910 * In case of a ubc_uiomove() error, 1911 * opt to not extend the file at all and 1912 * return an error. Otherwise, if we attempt 1913 * to clear the memory we couldn't fault to, 1914 * we might generate a kernel page fault. 1915 */ 1916 if (vp->v_size < newoff) { 1917 if (error == 0) { 1918 uflags |= PUFFS_UPDATESIZE; 1919 uvm_vnp_setsize(vp, newoff); 1920 } else { 1921 uvm_vnp_setwritesize(vp, vp->v_size); 1922 } 1923 } 1924 if (error) 1925 break; 1926 1927 /* 1928 * If we're writing large files, flush to file server 1929 * every 64k. Otherwise we can very easily exhaust 1930 * kernel and user memory, as the file server cannot 1931 * really keep up with our writing speed. 1932 * 1933 * Note: this does *NOT* honor MNT_ASYNC, because 1934 * that gives userland too much say in the kernel. 1935 */ 1936 if (oldoff >> 16 != uio->uio_offset >> 16) { 1937 mutex_enter(&vp->v_interlock); 1938 error = VOP_PUTPAGES(vp, oldoff & ~0xffff, 1939 uio->uio_offset & ~0xffff, 1940 PGO_CLEANIT | PGO_SYNCIO); 1941 if (error) 1942 break; 1943 } 1944 } 1945 1946 /* synchronous I/O? */ 1947 if (error == 0 && ap->a_ioflag & IO_SYNC) { 1948 mutex_enter(&vp->v_interlock); 1949 error = VOP_PUTPAGES(vp, trunc_page(origoff), 1950 round_page(uio->uio_offset), 1951 PGO_CLEANIT | PGO_SYNCIO); 1952 1953 /* write through page cache? */ 1954 } else if (error == 0 && pmp->pmp_flags & PUFFS_KFLAG_WTCACHE) { 1955 mutex_enter(&vp->v_interlock); 1956 error = VOP_PUTPAGES(vp, trunc_page(origoff), 1957 round_page(uio->uio_offset), PGO_CLEANIT); 1958 } 1959 1960 puffs_updatenode(VPTOPP(vp), uflags, vp->v_size); 1961 } else { 1962 /* tomove is non-increasing */ 1963 tomove = PUFFS_TOMOVE(uio->uio_resid, pmp); 1964 argsize = sizeof(struct puffs_vnmsg_write) + tomove; 1965 puffs_msgmem_alloc(argsize, &park_write, (void *)&write_msg,1); 1966 1967 while (uio->uio_resid > 0) { 1968 /* move data to buffer */ 1969 tomove = PUFFS_TOMOVE(uio->uio_resid, pmp); 1970 memset(write_msg, 0, argsize); /* XXX: touser KASSERT */ 1971 RWARGS(write_msg, ap->a_ioflag, tomove, 1972 uio->uio_offset, ap->a_cred); 1973 error = uiomove(write_msg->pvnr_data, tomove, uio); 1974 if (error) 1975 break; 1976 1977 /* move buffer to userspace */ 1978 puffs_msg_setinfo(park_write, PUFFSOP_VN, 1979 PUFFS_VN_WRITE, VPTOPNC(vp)); 1980 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_write, vp->v_data, 1981 NULL, error); 1982 error = checkerr(pmp, error, __func__); 1983 if (error) 1984 break; 1985 1986 if (write_msg->pvnr_resid > tomove) { 1987 puffs_senderr(pmp, PUFFS_ERR_WRITE, 1988 E2BIG, "resid grew", VPTOPNC(ap->a_vp)); 1989 error = EPROTO; 1990 break; 1991 } 1992 1993 /* adjust file size */ 1994 if (vp->v_size < uio->uio_offset) 1995 uvm_vnp_setsize(vp, uio->uio_offset); 1996 1997 /* didn't move everything? bad userspace. bail */ 1998 if (write_msg->pvnr_resid != 0) { 1999 error = EIO; 2000 break; 2001 } 2002 } 2003 puffs_msgmem_release(park_write); 2004 } 2005 2006 return error; 2007 } 2008 2009 int 2010 puffs_vnop_print(void *v) 2011 { 2012 struct vop_print_args /* { 2013 struct vnode *a_vp; 2014 } */ *ap = v; 2015 PUFFS_MSG_VARS(vn, print); 2016 struct vnode *vp = ap->a_vp; 2017 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2018 struct puffs_node *pn = vp->v_data; 2019 int error; 2020 2021 /* kernel portion */ 2022 printf("tag VT_PUFFS, vnode %p, puffs node: %p,\n" 2023 " userspace cookie: %p\n", vp, pn, pn->pn_cookie); 2024 if (vp->v_type == VFIFO) 2025 fifo_printinfo(vp); 2026 2027 /* userspace portion */ 2028 if (EXISTSOP(pmp, PRINT)) { 2029 PUFFS_MSG_ALLOC(vn, print); 2030 puffs_msg_setinfo(park_print, PUFFSOP_VN, 2031 PUFFS_VN_PRINT, VPTOPNC(vp)); 2032 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_print, vp->v_data, 2033 NULL, error); 2034 PUFFS_MSG_RELEASE(print); 2035 } 2036 2037 return 0; 2038 } 2039 2040 int 2041 puffs_vnop_pathconf(void *v) 2042 { 2043 struct vop_pathconf_args /* { 2044 const struct vnodeop_desc *a_desc; 2045 struct vnode *a_vp; 2046 int a_name; 2047 register_t *a_retval; 2048 } */ *ap = v; 2049 PUFFS_MSG_VARS(vn, pathconf); 2050 struct vnode *vp = ap->a_vp; 2051 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2052 int error; 2053 2054 PUFFS_MSG_ALLOC(vn, pathconf); 2055 pathconf_msg->pvnr_name = ap->a_name; 2056 puffs_msg_setinfo(park_pathconf, PUFFSOP_VN, 2057 PUFFS_VN_PATHCONF, VPTOPNC(vp)); 2058 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_pathconf, vp->v_data, NULL, error); 2059 error = checkerr(pmp, error, __func__); 2060 if (!error) 2061 *ap->a_retval = pathconf_msg->pvnr_retval; 2062 PUFFS_MSG_RELEASE(pathconf); 2063 2064 return error; 2065 } 2066 2067 int 2068 puffs_vnop_advlock(void *v) 2069 { 2070 struct vop_advlock_args /* { 2071 const struct vnodeop_desc *a_desc; 2072 struct vnode *a_vp; 2073 void *a_id; 2074 int a_op; 2075 struct flock *a_fl; 2076 int a_flags; 2077 } */ *ap = v; 2078 PUFFS_MSG_VARS(vn, advlock); 2079 struct vnode *vp = ap->a_vp; 2080 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2081 int error; 2082 2083 PUFFS_MSG_ALLOC(vn, advlock); 2084 error = copyin(ap->a_fl, &advlock_msg->pvnr_fl, sizeof(struct flock)); 2085 if (error) 2086 goto out; 2087 advlock_msg->pvnr_id = ap->a_id; 2088 advlock_msg->pvnr_op = ap->a_op; 2089 advlock_msg->pvnr_flags = ap->a_flags; 2090 puffs_msg_setinfo(park_advlock, PUFFSOP_VN, 2091 PUFFS_VN_ADVLOCK, VPTOPNC(vp)); 2092 2093 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_advlock, vp->v_data, NULL, error); 2094 error = checkerr(pmp, error, __func__); 2095 2096 out: 2097 PUFFS_MSG_RELEASE(advlock); 2098 return error; 2099 } 2100 2101 #define BIOASYNC(bp) (bp->b_flags & B_ASYNC) 2102 2103 /* 2104 * This maps itself to PUFFS_VN_READ/WRITE for data transfer. 2105 */ 2106 int 2107 puffs_vnop_strategy(void *v) 2108 { 2109 struct vop_strategy_args /* { 2110 const struct vnodeop_desc *a_desc; 2111 struct vnode *a_vp; 2112 struct buf *a_bp; 2113 } */ *ap = v; 2114 PUFFS_MSG_VARS(vn, rw); 2115 struct vnode *vp = ap->a_vp; 2116 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2117 struct puffs_node *pn; 2118 struct buf *bp; 2119 size_t argsize; 2120 size_t tomove, moved; 2121 int error, dofaf, dobiodone; 2122 2123 pmp = MPTOPUFFSMP(vp->v_mount); 2124 bp = ap->a_bp; 2125 error = 0; 2126 dofaf = 0; 2127 pn = VPTOPP(vp); 2128 park_rw = NULL; /* explicit */ 2129 dobiodone = 1; 2130 2131 if ((BUF_ISREAD(bp) && !EXISTSOP(pmp, READ)) 2132 || (BUF_ISWRITE(bp) && !EXISTSOP(pmp, WRITE))) 2133 ERROUT(EOPNOTSUPP); 2134 2135 #ifdef DIAGNOSTIC 2136 if (bp->b_bcount > pmp->pmp_msg_maxsize - PUFFS_MSGSTRUCT_MAX) 2137 panic("puffs_strategy: wildly inappropriate buf bcount %d", 2138 bp->b_bcount); 2139 #endif 2140 2141 /* 2142 * See explanation for the necessity of a FAF in puffs_fsync. 2143 * 2144 * Also, do FAF in case we're suspending. 2145 * See puffs_vfsops.c:pageflush() 2146 */ 2147 if (BUF_ISWRITE(bp)) { 2148 mutex_enter(&vp->v_interlock); 2149 if (vp->v_iflag & VI_XLOCK) 2150 dofaf = 1; 2151 if (pn->pn_stat & PNODE_SUSPEND) 2152 dofaf = 1; 2153 mutex_exit(&vp->v_interlock); 2154 } 2155 2156 #ifdef DIAGNOSTIC 2157 if (curlwp == uvm.pagedaemon_lwp) 2158 KASSERT(dofaf || BIOASYNC(bp)); 2159 #endif 2160 2161 /* allocate transport structure */ 2162 tomove = PUFFS_TOMOVE(bp->b_bcount, pmp); 2163 argsize = sizeof(struct puffs_vnmsg_rw); 2164 error = puffs_msgmem_alloc(argsize + tomove, &park_rw, 2165 (void *)&rw_msg, dofaf ? 0 : 1); 2166 if (error) 2167 goto out; 2168 RWARGS(rw_msg, 0, tomove, bp->b_blkno << DEV_BSHIFT, FSCRED); 2169 2170 /* 2x2 cases: read/write, faf/nofaf */ 2171 if (BUF_ISREAD(bp)) { 2172 puffs_msg_setinfo(park_rw, PUFFSOP_VN, 2173 PUFFS_VN_READ, VPTOPNC(vp)); 2174 puffs_msg_setdelta(park_rw, tomove); 2175 if (BIOASYNC(bp)) { 2176 puffs_msg_setcall(park_rw, 2177 puffs_parkdone_asyncbioread, bp); 2178 puffs_msg_enqueue(pmp, park_rw); 2179 dobiodone = 0; 2180 } else { 2181 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_rw, vp->v_data, 2182 NULL, error); 2183 error = checkerr(pmp, error, __func__); 2184 if (error) 2185 goto out; 2186 2187 if (rw_msg->pvnr_resid > tomove) { 2188 puffs_senderr(pmp, PUFFS_ERR_READ, 2189 E2BIG, "resid grew", VPTOPNC(vp)); 2190 ERROUT(EPROTO); 2191 } 2192 2193 moved = tomove - rw_msg->pvnr_resid; 2194 2195 (void)memcpy(bp->b_data, rw_msg->pvnr_data, moved); 2196 bp->b_resid = bp->b_bcount - moved; 2197 } 2198 } else { 2199 puffs_msg_setinfo(park_rw, PUFFSOP_VN, 2200 PUFFS_VN_WRITE, VPTOPNC(vp)); 2201 /* 2202 * make pages read-only before we write them if we want 2203 * write caching info 2204 */ 2205 if (PUFFS_WCACHEINFO(pmp)) { 2206 struct uvm_object *uobj = &vp->v_uobj; 2207 int npages = (bp->b_bcount + PAGE_SIZE-1) >> PAGE_SHIFT; 2208 struct vm_page *vmp; 2209 int i; 2210 2211 for (i = 0; i < npages; i++) { 2212 vmp= uvm_pageratop((vaddr_t)bp->b_data 2213 + (i << PAGE_SHIFT)); 2214 DPRINTF(("puffs_strategy: write-protecting " 2215 "vp %p page %p, offset %" PRId64"\n", 2216 vp, vmp, vmp->offset)); 2217 mutex_enter(&uobj->vmobjlock); 2218 vmp->flags |= PG_RDONLY; 2219 pmap_page_protect(vmp, VM_PROT_READ); 2220 mutex_exit(&uobj->vmobjlock); 2221 } 2222 } 2223 2224 (void)memcpy(&rw_msg->pvnr_data, bp->b_data, tomove); 2225 if (dofaf) { 2226 puffs_msg_setfaf(park_rw); 2227 } else if (BIOASYNC(bp)) { 2228 puffs_msg_setcall(park_rw, 2229 puffs_parkdone_asyncbiowrite, bp); 2230 dobiodone = 0; 2231 } 2232 2233 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_rw, vp->v_data, NULL, error); 2234 2235 if (dobiodone == 0) 2236 goto out; 2237 2238 /* 2239 * XXXXXXXX: wrong, but kernel can't survive strategy 2240 * failure currently. Here, have one more X: X. 2241 */ 2242 if (error != ENOMEM) 2243 error = 0; 2244 2245 error = checkerr(pmp, error, __func__); 2246 if (error) 2247 goto out; 2248 2249 if (rw_msg->pvnr_resid > tomove) { 2250 puffs_senderr(pmp, PUFFS_ERR_WRITE, 2251 E2BIG, "resid grew", VPTOPNC(vp)); 2252 ERROUT(EPROTO); 2253 } 2254 2255 /* 2256 * FAF moved everything. Frankly, we don't 2257 * really have a choice. 2258 */ 2259 if (dofaf && error == 0) 2260 moved = tomove; 2261 else 2262 moved = tomove - rw_msg->pvnr_resid; 2263 2264 bp->b_resid = bp->b_bcount - moved; 2265 if (bp->b_resid != 0) { 2266 ERROUT(EIO); 2267 } 2268 } 2269 2270 out: 2271 if (park_rw) 2272 puffs_msgmem_release(park_rw); 2273 2274 if (error) 2275 bp->b_error = error; 2276 2277 if (error || dobiodone) 2278 biodone(bp); 2279 2280 return error; 2281 } 2282 2283 int 2284 puffs_vnop_mmap(void *v) 2285 { 2286 struct vop_mmap_args /* { 2287 const struct vnodeop_desc *a_desc; 2288 struct vnode *a_vp; 2289 vm_prot_t a_prot; 2290 kauth_cred_t a_cred; 2291 } */ *ap = v; 2292 PUFFS_MSG_VARS(vn, mmap); 2293 struct vnode *vp = ap->a_vp; 2294 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 2295 int error; 2296 2297 if (!PUFFS_USE_PAGECACHE(pmp)) 2298 return genfs_eopnotsupp(v); 2299 2300 if (EXISTSOP(pmp, MMAP)) { 2301 PUFFS_MSG_ALLOC(vn, mmap); 2302 mmap_msg->pvnr_prot = ap->a_prot; 2303 puffs_credcvt(&mmap_msg->pvnr_cred, ap->a_cred); 2304 puffs_msg_setinfo(park_mmap, PUFFSOP_VN, 2305 PUFFS_VN_MMAP, VPTOPNC(vp)); 2306 2307 PUFFS_MSG_ENQUEUEWAIT2(pmp, park_mmap, vp->v_data, NULL, error); 2308 error = checkerr(pmp, error, __func__); 2309 PUFFS_MSG_RELEASE(mmap); 2310 } else { 2311 error = genfs_mmap(v); 2312 } 2313 2314 return error; 2315 } 2316 2317 2318 /* 2319 * The rest don't get a free trip to userspace and back, they 2320 * have to stay within the kernel. 2321 */ 2322 2323 /* 2324 * bmap doesn't really make any sense for puffs, so just 1:1 map it. 2325 * well, maybe somehow, somewhere, some day .... 2326 */ 2327 int 2328 puffs_vnop_bmap(void *v) 2329 { 2330 struct vop_bmap_args /* { 2331 const struct vnodeop_desc *a_desc; 2332 struct vnode *a_vp; 2333 daddr_t a_bn; 2334 struct vnode **a_vpp; 2335 daddr_t *a_bnp; 2336 int *a_runp; 2337 } */ *ap = v; 2338 struct puffs_mount *pmp; 2339 2340 pmp = MPTOPUFFSMP(ap->a_vp->v_mount); 2341 2342 if (ap->a_vpp) 2343 *ap->a_vpp = ap->a_vp; 2344 if (ap->a_bnp) 2345 *ap->a_bnp = ap->a_bn; 2346 if (ap->a_runp) 2347 *ap->a_runp 2348 = (PUFFS_TOMOVE(pmp->pmp_msg_maxsize, pmp)>>DEV_BSHIFT) - 1; 2349 2350 return 0; 2351 } 2352 2353 /* 2354 * Handle getpages faults in puffs. We let genfs_getpages() do most 2355 * of the dirty work, but we come in this route to do accounting tasks. 2356 * If the user server has specified functions for cache notifications 2357 * about reads and/or writes, we record which type of operation we got, 2358 * for which page range, and proceed to issue a FAF notification to the 2359 * server about it. 2360 */ 2361 int 2362 puffs_vnop_getpages(void *v) 2363 { 2364 struct vop_getpages_args /* { 2365 const struct vnodeop_desc *a_desc; 2366 struct vnode *a_vp; 2367 voff_t a_offset; 2368 struct vm_page **a_m; 2369 int *a_count; 2370 int a_centeridx; 2371 vm_prot_t a_access_type; 2372 int a_advice; 2373 int a_flags; 2374 } */ *ap = v; 2375 struct puffs_mount *pmp; 2376 struct puffs_node *pn; 2377 struct vnode *vp; 2378 struct vm_page **pgs; 2379 struct puffs_cacheinfo *pcinfo = NULL; 2380 struct puffs_cacherun *pcrun; 2381 void *parkmem = NULL; 2382 size_t runsizes; 2383 int i, npages, si, streakon; 2384 int error, locked, write; 2385 2386 pmp = MPTOPUFFSMP(ap->a_vp->v_mount); 2387 npages = *ap->a_count; 2388 pgs = ap->a_m; 2389 vp = ap->a_vp; 2390 pn = vp->v_data; 2391 locked = (ap->a_flags & PGO_LOCKED) != 0; 2392 write = (ap->a_access_type & VM_PROT_WRITE) != 0; 2393 2394 /* ccg xnaht - gets Wuninitialized wrong */ 2395 pcrun = NULL; 2396 runsizes = 0; 2397 2398 /* 2399 * Check that we aren't trying to fault in pages which our file 2400 * server doesn't know about. This happens if we extend a file by 2401 * skipping some pages and later try to fault in pages which 2402 * are between pn_serversize and vp_size. This check optimizes 2403 * away the common case where a file is being extended. 2404 */ 2405 if (ap->a_offset >= pn->pn_serversize && ap->a_offset < vp->v_size) { 2406 struct vattr va; 2407 2408 /* try again later when we can block */ 2409 if (locked) 2410 ERROUT(EBUSY); 2411 2412 mutex_exit(&vp->v_interlock); 2413 vattr_null(&va); 2414 va.va_size = vp->v_size; 2415 error = dosetattr(vp, &va, FSCRED, 0); 2416 if (error) 2417 ERROUT(error); 2418 mutex_enter(&vp->v_interlock); 2419 } 2420 2421 if (write && PUFFS_WCACHEINFO(pmp)) { 2422 #ifdef notnowjohn 2423 /* allocate worst-case memory */ 2424 runsizes = ((npages / 2) + 1) * sizeof(struct puffs_cacherun); 2425 pcinfo = kmem_zalloc(sizeof(struct puffs_cacheinfo) + runsize, 2426 locked ? KM_NOSLEEP : KM_SLEEP); 2427 2428 /* 2429 * can't block if we're locked and can't mess up caching 2430 * information for fs server. so come back later, please 2431 */ 2432 if (pcinfo == NULL) 2433 ERROUT(ENOMEM); 2434 2435 parkmem = puffs_park_alloc(locked == 0); 2436 if (parkmem == NULL) 2437 ERROUT(ENOMEM); 2438 2439 pcrun = pcinfo->pcache_runs; 2440 #else 2441 (void)parkmem; 2442 #endif 2443 } 2444 2445 error = genfs_getpages(v); 2446 if (error) 2447 goto out; 2448 2449 if (PUFFS_WCACHEINFO(pmp) == 0) 2450 goto out; 2451 2452 /* 2453 * Let's see whose fault it was and inform the user server of 2454 * possibly read/written pages. Map pages from read faults 2455 * strictly read-only, since otherwise we might miss info on 2456 * when the page is actually write-faulted to. 2457 */ 2458 if (!locked) 2459 mutex_enter(&vp->v_uobj.vmobjlock); 2460 for (i = 0, si = 0, streakon = 0; i < npages; i++) { 2461 if (pgs[i] == NULL || pgs[i] == PGO_DONTCARE) { 2462 if (streakon && write) { 2463 streakon = 0; 2464 pcrun[si].pcache_runend 2465 = trunc_page(pgs[i]->offset) + PAGE_MASK; 2466 si++; 2467 } 2468 continue; 2469 } 2470 if (streakon == 0 && write) { 2471 streakon = 1; 2472 pcrun[si].pcache_runstart = pgs[i]->offset; 2473 } 2474 2475 if (!write) 2476 pgs[i]->flags |= PG_RDONLY; 2477 } 2478 /* was the last page part of our streak? */ 2479 if (streakon) { 2480 pcrun[si].pcache_runend 2481 = trunc_page(pgs[i-1]->offset) + PAGE_MASK; 2482 si++; 2483 } 2484 if (!locked) 2485 mutex_exit(&vp->v_uobj.vmobjlock); 2486 2487 KASSERT(si <= (npages / 2) + 1); 2488 2489 #ifdef notnowjohn 2490 /* send results to userspace */ 2491 if (write) 2492 puffs_cacheop(pmp, parkmem, pcinfo, 2493 sizeof(struct puffs_cacheinfo) + runsizes, VPTOPNC(vp)); 2494 #endif 2495 2496 out: 2497 if (error) { 2498 if (pcinfo != NULL) 2499 kmem_free(pcinfo, 2500 sizeof(struct puffs_cacheinfo) + runsizes); 2501 #ifdef notnowjohn 2502 if (parkmem != NULL) 2503 puffs_park_release(parkmem, 1); 2504 #endif 2505 } 2506 2507 return error; 2508 } 2509 2510 int 2511 puffs_vnop_lock(void *v) 2512 { 2513 struct vop_lock_args /* { 2514 struct vnode *a_vp; 2515 int a_flags; 2516 } */ *ap = v; 2517 struct vnode *vp = ap->a_vp; 2518 struct mount *mp = vp->v_mount; 2519 int flags = ap->a_flags; 2520 2521 #if 0 2522 DPRINTF(("puffs_lock: lock %p, args 0x%x\n", vp, ap->a_flags)); 2523 #endif 2524 2525 if (flags & LK_INTERLOCK) { 2526 mutex_exit(&vp->v_interlock); 2527 flags &= ~LK_INTERLOCK; 2528 } 2529 2530 /* 2531 * XXX: this avoids deadlocking when we're suspending. 2532 * e.g. some ops holding the vnode lock might be blocked for 2533 * the vfs transaction lock so we'd deadlock. 2534 * 2535 * Now once again this is skating on the thin ice of modern life, 2536 * since we are breaking the consistency guarantee provided 2537 * _to the user server_ by vnode locking. Hopefully this will 2538 * get fixed soon enough by getting rid of the dependency on 2539 * vnode locks alltogether. 2540 */ 2541 if (fstrans_is_owner(mp) && fstrans_getstate(mp) == FSTRANS_SUSPENDING){ 2542 return 0; 2543 } 2544 2545 return vlockmgr(&vp->v_lock, flags); 2546 } 2547 2548 int 2549 puffs_vnop_unlock(void *v) 2550 { 2551 struct vop_unlock_args /* { 2552 struct vnode *a_vp; 2553 int a_flags; 2554 } */ *ap = v; 2555 struct vnode *vp = ap->a_vp; 2556 struct mount *mp = vp->v_mount; 2557 2558 #if 0 2559 DPRINTF(("puffs_unlock: lock %p, args 0x%x\n", vp, ap->a_flags)); 2560 #endif 2561 2562 /* XXX: see puffs_lock() */ 2563 if (fstrans_is_owner(mp) && fstrans_getstate(mp) == FSTRANS_SUSPENDING){ 2564 return 0; 2565 } 2566 2567 return vlockmgr(&vp->v_lock, ap->a_flags | LK_RELEASE); 2568 } 2569 2570 int 2571 puffs_vnop_islocked(void *v) 2572 { 2573 struct vop_islocked_args *ap = v; 2574 int rv; 2575 2576 rv = vlockstatus(&ap->a_vp->v_lock); 2577 return rv; 2578 } 2579 2580 2581 /* 2582 * spec & fifo. These call the miscfs spec and fifo vectors, but issue 2583 * FAF update information for the puffs node first. 2584 */ 2585 int 2586 puffs_vnop_spec_read(void *v) 2587 { 2588 struct vop_read_args /* { 2589 const struct vnodeop_desc *a_desc; 2590 struct vnode *a_vp; 2591 struct uio *a_uio; 2592 int a_ioflag; 2593 kauth_cred_t a_cred; 2594 } */ *ap = v; 2595 2596 puffs_updatenode(VPTOPP(ap->a_vp), PUFFS_UPDATEATIME, 0); 2597 return VOCALL(spec_vnodeop_p, VOFFSET(vop_read), v); 2598 } 2599 2600 int 2601 puffs_vnop_spec_write(void *v) 2602 { 2603 struct vop_write_args /* { 2604 const struct vnodeop_desc *a_desc; 2605 struct vnode *a_vp; 2606 struct uio *a_uio; 2607 int a_ioflag; 2608 kauth_cred_t a_cred; 2609 } */ *ap = v; 2610 2611 puffs_updatenode(VPTOPP(ap->a_vp), PUFFS_UPDATEMTIME, 0); 2612 return VOCALL(spec_vnodeop_p, VOFFSET(vop_write), v); 2613 } 2614 2615 int 2616 puffs_vnop_fifo_read(void *v) 2617 { 2618 struct vop_read_args /* { 2619 const struct vnodeop_desc *a_desc; 2620 struct vnode *a_vp; 2621 struct uio *a_uio; 2622 int a_ioflag; 2623 kauth_cred_t a_cred; 2624 } */ *ap = v; 2625 2626 puffs_updatenode(VPTOPP(ap->a_vp), PUFFS_UPDATEATIME, 0); 2627 return VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), v); 2628 } 2629 2630 int 2631 puffs_vnop_fifo_write(void *v) 2632 { 2633 struct vop_write_args /* { 2634 const struct vnodeop_desc *a_desc; 2635 struct vnode *a_vp; 2636 struct uio *a_uio; 2637 int a_ioflag; 2638 kauth_cred_t a_cred; 2639 } */ *ap = v; 2640 2641 puffs_updatenode(VPTOPP(ap->a_vp), PUFFS_UPDATEMTIME, 0); 2642 return VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), v); 2643 } 2644
Indexes created Mon Sep 29 21:09:56 GMT 2025