1 /* $NetBSD: v7fs_vnops.c,v 1.22 2016/08/20 12:37:08 hannken Exp $ */ 2 3 /*- 4 * Copyright (c) 2004, 2011 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by UCHIYAMA Yasushi. 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: v7fs_vnops.c,v 1.22 2016/08/20 12:37:08 hannken Exp $"); 34 #if defined _KERNEL_OPT 35 #include "opt_v7fs.h" 36 #endif 37 38 #include <sys/param.h> 39 #include <sys/kernel.h> 40 #include <sys/resource.h> 41 #include <sys/vnode.h> 42 #include <sys/namei.h> 43 #include <sys/dirent.h> 44 #include <sys/kmem.h> 45 #include <sys/lockf.h> 46 #include <sys/unistd.h> 47 #include <sys/fcntl.h> 48 #include <sys/kauth.h> 49 #include <sys/buf.h> 50 #include <sys/stat.h> /*APPEND */ 51 #include <miscfs/genfs/genfs.h> 52 53 #include <fs/v7fs/v7fs.h> 54 #include <fs/v7fs/v7fs_impl.h> 55 #include <fs/v7fs/v7fs_inode.h> 56 #include <fs/v7fs/v7fs_dirent.h> 57 #include <fs/v7fs/v7fs_file.h> 58 #include <fs/v7fs/v7fs_datablock.h> 59 #include <fs/v7fs/v7fs_extern.h> 60 61 #ifdef V7FS_VNOPS_DEBUG 62 #define DPRINTF(fmt, args...) printf("%s: " fmt, __func__, ##args) 63 #else 64 #define DPRINTF(arg...) ((void)0) 65 #endif 66 67 static v7fs_mode_t vtype_to_v7fs_mode(enum vtype); 68 static uint8_t v7fs_mode_to_d_type(v7fs_mode_t); 69 70 static v7fs_mode_t 71 vtype_to_v7fs_mode(enum vtype type) 72 { 73 /* Convert Vnode types to V7FS types (sys/vnode.h)*/ 74 v7fs_mode_t table[] = { 0, V7FS_IFREG, V7FS_IFDIR, V7FS_IFBLK, 75 V7FS_IFCHR, V7FSBSD_IFLNK, V7FSBSD_IFSOCK, 76 V7FSBSD_IFFIFO }; 77 return table[type]; 78 } 79 80 static uint8_t 81 v7fs_mode_to_d_type(v7fs_mode_t mode) 82 { 83 /* Convert V7FS types to dirent d_type (sys/dirent.h)*/ 84 85 return (mode & V7FS_IFMT) >> 12; 86 } 87 88 int 89 v7fs_lookup(void *v) 90 { 91 struct vop_lookup_v2_args /* { 92 struct vnode *a_dvp; 93 struct vnode **a_vpp; 94 struct componentname *a_cnp; 95 } */ *a = v; 96 struct vnode *dvp = a->a_dvp; 97 struct v7fs_node *parent_node = dvp->v_data; 98 struct v7fs_inode *parent = &parent_node->inode; 99 struct v7fs_self *fs = parent_node->v7fsmount->core;/* my filesystem */ 100 struct vnode *vpp; 101 struct componentname *cnp = a->a_cnp; 102 int nameiop = cnp->cn_nameiop; 103 const char *name = cnp->cn_nameptr; 104 int namelen = cnp->cn_namelen; 105 int flags = cnp->cn_flags; 106 bool isdotdot = flags & ISDOTDOT; 107 bool islastcn = flags & ISLASTCN; 108 v7fs_ino_t ino; 109 int error; 110 #ifdef V7FS_VNOPS_DEBUG 111 const char *opname[] = { "LOOKUP", "CREATE", "DELETE", "RENAME" }; 112 #endif 113 DPRINTF("'%s' op=%s flags=%d parent=%d %o %dbyte\n", name, 114 opname[nameiop], cnp->cn_flags, parent->inode_number, parent->mode, 115 parent->filesize); 116 117 *a->a_vpp = 0; 118 119 /* Check directory permission for search */ 120 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred))) { 121 DPRINTF("***perm.\n"); 122 return error; 123 } 124 125 /* Deny last component write operation on a read-only mount */ 126 if (islastcn && (dvp->v_mount->mnt_flag & MNT_RDONLY) && 127 (nameiop == DELETE || nameiop == RENAME)) { 128 DPRINTF("***ROFS.\n"); 129 return EROFS; 130 } 131 132 /* No lookup on removed directory */ 133 if (v7fs_inode_nlink(parent) == 0) 134 return ENOENT; 135 136 /* "." */ 137 if (namelen == 1 && name[0] == '.') { 138 if ((nameiop == RENAME) && islastcn) { 139 return EISDIR; /* t_vnops rename_dir(3) */ 140 } 141 vref(dvp); /* v_usecount++ */ 142 *a->a_vpp = dvp; 143 DPRINTF("done.(.)\n"); 144 return 0; 145 } 146 147 /* ".." and reguler file. */ 148 if ((error = v7fs_file_lookup_by_name(fs, parent, name, &ino))) { 149 /* Not found. Tell this entry be able to allocate. */ 150 if (((nameiop == CREATE) || (nameiop == RENAME)) && islastcn) { 151 /* Check directory permission to allocate. */ 152 if ((error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred))) { 153 DPRINTF("access denied. (%s)\n", name); 154 return error; 155 } 156 DPRINTF("EJUSTRETURN op=%d (%s)\n", nameiop, name); 157 return EJUSTRETURN; 158 } 159 DPRINTF("lastcn=%d\n", flags & ISLASTCN); 160 return error; 161 } 162 163 if ((nameiop == DELETE) && islastcn) { 164 if ((error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred))) { 165 DPRINTF("access denied. (%s)\n", name); 166 return error; 167 } 168 } 169 170 /* Entry found. Allocate v-node */ 171 // Check permissions? 172 vpp = 0; 173 if (isdotdot) { 174 VOP_UNLOCK(dvp); /* preserve reference count. (not vput) */ 175 } 176 DPRINTF("enter vget\n"); 177 if ((error = v7fs_vget(dvp->v_mount, ino, &vpp))) { 178 DPRINTF("***can't get vnode.\n"); 179 return error; 180 } 181 DPRINTF("exit vget\n"); 182 if (isdotdot) { 183 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 184 } 185 if (vpp != dvp) 186 VOP_UNLOCK(vpp); 187 *a->a_vpp = vpp; 188 DPRINTF("done.(%s)\n", name); 189 190 return 0; 191 } 192 193 int 194 v7fs_create(void *v) 195 { 196 struct vop_create_v3_args /* { 197 struct vnode *a_dvp; 198 struct vnode **a_vpp; 199 struct componentname *a_cnp; 200 struct vattr *a_vap; 201 } */ *a = v; 202 struct v7fs_node *parent_node = a->a_dvp->v_data; 203 struct v7fs_mount *v7fsmount = parent_node->v7fsmount; 204 struct v7fs_self *fs = v7fsmount->core; 205 struct mount *mp = v7fsmount->mountp; 206 struct v7fs_fileattr attr; 207 struct vattr *va = a->a_vap; 208 kauth_cred_t cr = a->a_cnp->cn_cred; 209 v7fs_ino_t ino; 210 int error = 0; 211 212 DPRINTF("%s parent#%d\n", a->a_cnp->cn_nameptr, 213 parent_node->inode.inode_number); 214 KDASSERT((va->va_type == VREG) || (va->va_type == VSOCK)); 215 216 memset(&attr, 0, sizeof(attr)); 217 attr.uid = kauth_cred_geteuid(cr); 218 attr.gid = kauth_cred_getegid(cr); 219 attr.mode = va->va_mode | vtype_to_v7fs_mode (va->va_type); 220 attr.device = 0; 221 222 /* Allocate disk entry. and register its entry to parent directory. */ 223 if ((error = v7fs_file_allocate(fs, &parent_node->inode, 224 a->a_cnp->cn_nameptr, &attr, &ino))) { 225 DPRINTF("v7fs_file_allocate failed.\n"); 226 return error; 227 } 228 /* Sync dirent size change. */ 229 uvm_vnp_setsize(a->a_dvp, v7fs_inode_filesize(&parent_node->inode)); 230 231 /* Get myself vnode. */ 232 *a->a_vpp = 0; 233 if ((error = v7fs_vget(mp, ino, a->a_vpp))) { 234 DPRINTF("v7fs_vget failed.\n"); 235 return error; 236 } 237 238 /* Scheduling update time. real update by v7fs_update */ 239 struct v7fs_node *newnode = (*a->a_vpp)->v_data; 240 newnode->update_ctime = true; 241 newnode->update_mtime = true; 242 newnode->update_atime = true; 243 DPRINTF("allocated %s->#%d\n", a->a_cnp->cn_nameptr, ino); 244 245 if (error == 0) 246 VOP_UNLOCK(*a->a_vpp); 247 248 return error; 249 } 250 251 int 252 v7fs_mknod(void *v) 253 { 254 struct vop_mknod_v3_args /* { 255 struct vnode *a_dvp; 256 struct vnode **a_vpp; 257 struct componentname *a_cnp; 258 struct vattr *a_vap; 259 } */ *a = v; 260 struct componentname *cnp = a->a_cnp; 261 kauth_cred_t cr = cnp->cn_cred; 262 struct vnode *dvp = a->a_dvp; 263 struct vattr *va = a->a_vap; 264 struct v7fs_node *parent_node = dvp->v_data; 265 struct v7fs_mount *v7fsmount = parent_node->v7fsmount; 266 struct v7fs_self *fs = v7fsmount->core; 267 struct mount *mp = v7fsmount->mountp; 268 struct v7fs_fileattr attr; 269 270 v7fs_ino_t ino; 271 int error = 0; 272 273 DPRINTF("%s %06o %lx %d\n", cnp->cn_nameptr, va->va_mode, 274 (long)va->va_rdev, va->va_type); 275 memset(&attr, 0, sizeof(attr)); 276 attr.uid = kauth_cred_geteuid(cr); 277 attr.gid = kauth_cred_getegid(cr); 278 attr.mode = va->va_mode | vtype_to_v7fs_mode(va->va_type); 279 attr.device = va->va_rdev; 280 281 if ((error = v7fs_file_allocate(fs, &parent_node->inode, 282 cnp->cn_nameptr, &attr, &ino))) 283 return error; 284 /* Sync dirent size change. */ 285 uvm_vnp_setsize(dvp, v7fs_inode_filesize(&parent_node->inode)); 286 287 if ((error = v7fs_vget(mp, ino, a->a_vpp))) { 288 DPRINTF("can't get vnode.\n"); 289 return error; 290 } 291 struct v7fs_node *newnode = (*a->a_vpp)->v_data; 292 newnode->update_ctime = true; 293 newnode->update_mtime = true; 294 newnode->update_atime = true; 295 296 if (error == 0) 297 VOP_UNLOCK(*a->a_vpp); 298 299 return error; 300 } 301 302 int 303 v7fs_open(void *v) 304 { 305 struct vop_open_args /* { 306 struct vnode *a_vp; 307 int a_mode; 308 kauth_cred_t a_cred; 309 } */ *a = v; 310 311 struct vnode *vp = a->a_vp; 312 struct v7fs_node *v7node = vp->v_data; 313 struct v7fs_inode *inode = &v7node->inode; 314 315 DPRINTF("inode %d\n", inode->inode_number); 316 /* Append mode file pointer is managed by kernel. */ 317 if (inode->append_mode && 318 ((a->a_mode & (FWRITE | O_APPEND)) == FWRITE)) { 319 DPRINTF("file is already opened by append mode.\n"); 320 return EPERM; 321 } 322 323 return 0; 324 } 325 326 int 327 v7fs_close(void *v) 328 { 329 struct vop_close_args /* { 330 struct vnodeop_desc *a_desc; 331 struct vnode *a_vp; 332 int a_fflag; 333 kauth_cred_t a_cred; 334 } */ *a = v; 335 struct vnode *vp = a->a_vp; 336 #ifdef V7FS_VNOPS_DEBUG 337 struct v7fs_node *v7node = vp->v_data; 338 struct v7fs_inode *inode = &v7node->inode; 339 #endif 340 DPRINTF("#%d (i)%dbyte (v)%zubyte\n", inode->inode_number, 341 v7fs_inode_filesize(inode), vp->v_size); 342 343 /* Update timestamp */ 344 v7fs_update(vp, 0, 0, UPDATE_WAIT); 345 346 return 0; 347 } 348 349 static int 350 v7fs_check_possible(struct vnode *vp, struct v7fs_node *v7node, 351 mode_t mode) 352 { 353 354 if (!(mode & VWRITE)) 355 return 0; 356 357 switch (vp->v_type) { 358 default: 359 /* special file is always writable. */ 360 return 0; 361 case VDIR: 362 case VLNK: 363 case VREG: 364 break; 365 } 366 367 return vp->v_mount->mnt_flag & MNT_RDONLY ? EROFS : 0; 368 } 369 370 static int 371 v7fs_check_permitted(struct vnode *vp, struct v7fs_node *v7node, 372 mode_t mode, kauth_cred_t cred) 373 { 374 375 struct v7fs_inode *inode = &v7node->inode; 376 377 return kauth_authorize_vnode(cred, KAUTH_ACCESS_ACTION(mode, 378 vp->v_type, inode->mode), vp, NULL, genfs_can_access(vp->v_type, 379 inode->mode, inode->uid, inode->gid, mode, cred)); 380 } 381 382 int 383 v7fs_access(void *v) 384 { 385 struct vop_access_args /* { 386 struct vnode *a_vp; 387 int a_mode; 388 kauth_cred_t a_cred; 389 } */ *ap = v; 390 struct vnode *vp = ap->a_vp; 391 struct v7fs_node *v7node = vp->v_data; 392 int error; 393 394 error = v7fs_check_possible(vp, v7node, ap->a_mode); 395 if (error) 396 return error; 397 398 error = v7fs_check_permitted(vp, v7node, ap->a_mode, ap->a_cred); 399 400 return error; 401 } 402 403 int 404 v7fs_getattr(void *v) 405 { 406 struct vop_getattr_args /* { 407 struct vnode *a_vp; 408 struct vattr *a_vap; 409 kauth_cred_t a_cred; 410 } */ *ap = v; 411 struct vnode *vp = ap->a_vp; 412 struct v7fs_node *v7node = vp->v_data; 413 struct v7fs_inode *inode = &v7node->inode; 414 struct v7fs_mount *v7fsmount = v7node->v7fsmount; 415 struct vattr *vap = ap->a_vap; 416 417 DPRINTF("\n"); 418 vap->va_type = vp->v_type; 419 vap->va_mode = inode->mode; 420 vap->va_nlink = inode->nlink; 421 vap->va_uid = inode->uid; 422 vap->va_gid = inode->gid; 423 vap->va_fsid = v7fsmount->devvp->v_rdev; 424 vap->va_fileid = inode->inode_number; 425 vap->va_size = vp->v_size; 426 if (vp->v_type == VLNK) { 427 /* Ajust for trailing NUL. */ 428 KASSERT(vap->va_size > 0); 429 vap->va_size -= 1; 430 } 431 vap->va_atime.tv_sec = inode->atime; 432 vap->va_mtime.tv_sec = inode->mtime; 433 vap->va_ctime.tv_sec = inode->ctime; 434 vap->va_birthtime.tv_sec = 0; 435 vap->va_gen = 1; 436 vap->va_flags = inode->append_mode ? SF_APPEND : 0; 437 vap->va_rdev = inode->device; 438 vap->va_bytes = vap->va_size; /* No sparse support. */ 439 vap->va_filerev = 0; 440 vap->va_vaflags = 0; 441 /* PAGE_SIZE is larger than sizeof(struct dirent). OK. 442 getcwd_scandir()@vfs_getcwd.c */ 443 vap->va_blocksize = PAGE_SIZE; 444 445 return 0; 446 } 447 448 int 449 v7fs_setattr(void *v) 450 { 451 struct vop_setattr_args /* { 452 struct vnode *a_vp; 453 struct vattr *a_vap; 454 kauth_cred_t a_cred; 455 struct proc *p; 456 } */ *ap = v; 457 struct vnode *vp = ap->a_vp; 458 struct vattr *vap = ap->a_vap; 459 struct v7fs_node *v7node = vp->v_data; 460 struct v7fs_self *fs = v7node->v7fsmount->core; 461 struct v7fs_inode *inode = &v7node->inode; 462 kauth_cred_t cred = ap->a_cred; 463 struct timespec *acc, *mod; 464 int error = 0; 465 acc = mod = NULL; 466 467 DPRINTF("\n"); 468 469 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 470 switch (vp->v_type) { 471 default: 472 /* special file is always writable. */ 473 break; 474 case VDIR: 475 case VLNK: 476 case VREG: 477 DPRINTF("read-only mount\n"); 478 return EROFS; 479 } 480 } 481 482 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 483 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 484 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 485 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 486 DPRINTF("invalid request\n"); 487 return EINVAL; 488 } 489 /* File pointer mode. */ 490 if (vap->va_flags != VNOVAL) { 491 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_FLAGS, 492 vp, NULL, genfs_can_chflags(cred, vp->v_type, inode->uid, 493 false)); 494 if (error) 495 return error; 496 inode->append_mode = vap->va_flags & SF_APPEND; 497 } 498 499 /* File size change. */ 500 if ((vap->va_size != VNOVAL) && (vp->v_type == VREG)) { 501 error = v7fs_datablock_size_change(fs, vap->va_size, inode); 502 if (error == 0) 503 uvm_vnp_setsize(vp, vap->va_size); 504 } 505 uid_t uid = inode->uid; 506 gid_t gid = inode->gid; 507 508 if (vap->va_uid != (uid_t)VNOVAL) { 509 uid = vap->va_uid; 510 error = kauth_authorize_vnode(cred, 511 KAUTH_VNODE_CHANGE_OWNERSHIP, vp, NULL, 512 genfs_can_chown(cred, inode->uid, inode->gid, uid, 513 gid)); 514 if (error) 515 return error; 516 inode->uid = uid; 517 } 518 if (vap->va_gid != (uid_t)VNOVAL) { 519 gid = vap->va_gid; 520 error = kauth_authorize_vnode(cred, 521 KAUTH_VNODE_CHANGE_OWNERSHIP, vp, NULL, 522 genfs_can_chown(cred, inode->uid, inode->gid, uid, 523 gid)); 524 if (error) 525 return error; 526 inode->gid = gid; 527 } 528 if (vap->va_mode != (mode_t)VNOVAL) { 529 mode_t mode = vap->va_mode; 530 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_SECURITY, 531 vp, NULL, genfs_can_chmod(vp->v_type, cred, inode->uid, inode->gid, 532 mode)); 533 if (error) { 534 return error; 535 } 536 v7fs_inode_chmod(inode, mode); 537 } 538 if ((vap->va_atime.tv_sec != VNOVAL) || 539 (vap->va_mtime.tv_sec != VNOVAL) || 540 (vap->va_ctime.tv_sec != VNOVAL)) { 541 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_TIMES, vp, 542 NULL, genfs_can_chtimes(vp, vap->va_vaflags, inode->uid, 543 cred)); 544 if (error) 545 return error; 546 547 if (vap->va_atime.tv_sec != VNOVAL) { 548 acc = &vap->va_atime; 549 } 550 if (vap->va_mtime.tv_sec != VNOVAL) { 551 mod = &vap->va_mtime; 552 v7node->update_mtime = true; 553 } 554 if (vap->va_ctime.tv_sec != VNOVAL) { 555 v7node->update_ctime = true; 556 } 557 } 558 559 v7node->update_atime = true; 560 v7fs_update(vp, acc, mod, 0); 561 562 return error; 563 } 564 565 int 566 v7fs_read(void *v) 567 { 568 struct vop_read_args /* { 569 struct vnode *a_vp; 570 struct uio *a_uio; 571 int a_ioflag; 572 kauth_cred_t a_cred; 573 } */ *a = v; 574 struct vnode *vp = a->a_vp; 575 struct uio *uio = a->a_uio; 576 struct v7fs_node *v7node = vp->v_data; 577 struct v7fs_inode *inode = &v7node->inode; 578 vsize_t sz, filesz = v7fs_inode_filesize(inode); 579 const int advice = IO_ADV_DECODE(a->a_ioflag); 580 int error = 0; 581 582 DPRINTF("type=%d inode=%d\n", vp->v_type, v7node->inode.inode_number); 583 584 while (uio->uio_resid > 0) { 585 if ((sz = MIN(filesz - uio->uio_offset, uio->uio_resid)) == 0) 586 break; 587 588 error = ubc_uiomove(&vp->v_uobj, uio, sz, advice, UBC_READ | 589 UBC_PARTIALOK | UBC_UNMAP_FLAG(v)); 590 if (error) { 591 break; 592 } 593 DPRINTF("read %zubyte\n", sz); 594 } 595 v7node->update_atime = true; 596 597 return error; 598 } 599 600 int 601 v7fs_write(void *v) 602 { 603 struct vop_write_args /* { 604 struct vnode *a_vp; 605 struct uio *a_uio; 606 int a_ioflag; 607 kauth_cred_t a_cred; 608 } */ *a = v; 609 struct vnode *vp = a->a_vp; 610 struct uio *uio = a->a_uio; 611 int advice = IO_ADV_DECODE(a->a_ioflag); 612 struct v7fs_node *v7node = vp->v_data; 613 struct v7fs_inode *inode = &v7node->inode; 614 struct v7fs_self *fs = v7node->v7fsmount->core; 615 vsize_t sz; 616 int error = 0; 617 618 if (uio->uio_resid == 0) 619 return 0; 620 621 sz = v7fs_inode_filesize(inode); 622 DPRINTF("(i)%ld (v)%zu ofs=%zu + res=%zu = %zu\n", sz, vp->v_size, 623 uio->uio_offset, uio->uio_resid, uio->uio_offset + uio->uio_resid); 624 625 /* Append mode file offset is managed by kernel. */ 626 if (a->a_ioflag & IO_APPEND) 627 uio->uio_offset = sz; 628 629 /* If write region is over filesize, expand. */ 630 size_t newsize= uio->uio_offset + uio->uio_resid; 631 ssize_t expand = newsize - sz; 632 if (expand > 0) { 633 if ((error = v7fs_datablock_expand(fs, inode, expand))) 634 return error; 635 uvm_vnp_setsize(vp, newsize); 636 } 637 638 while (uio->uio_resid > 0) { 639 sz = uio->uio_resid; 640 if ((error = ubc_uiomove(&vp->v_uobj, uio, sz, advice, 641 UBC_WRITE | UBC_UNMAP_FLAG(v)))) 642 break; 643 DPRINTF("write %zubyte\n", sz); 644 } 645 v7node->update_mtime = true; 646 647 return error; 648 } 649 650 int 651 v7fs_fsync(void *v) 652 { 653 struct vop_fsync_args /* { 654 struct vnode *a_vp; 655 kauth_cred_t a_cred; 656 int a_flags; 657 off_t offlo; 658 off_t offhi; 659 } */ *a = v; 660 struct vnode *vp = a->a_vp; 661 int error, wait; 662 663 DPRINTF("%p\n", a->a_vp); 664 if (a->a_flags & FSYNC_CACHE) { 665 return EOPNOTSUPP; 666 } 667 668 wait = (a->a_flags & FSYNC_WAIT); 669 error = vflushbuf(vp, a->a_flags); 670 671 if (error == 0 && (a->a_flags & FSYNC_DATAONLY) == 0) 672 error = v7fs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); 673 674 return error; 675 } 676 677 int 678 v7fs_remove(void *v) 679 { 680 struct vop_remove_args /* { 681 struct vnodeop_desc *a_desc; 682 struct vnode * a_dvp; 683 struct vnode * a_vp; 684 struct componentname * a_cnp; 685 } */ *a = v; 686 struct v7fs_node *parent_node = a->a_dvp->v_data; 687 struct v7fs_mount *v7fsmount = parent_node->v7fsmount; 688 struct vnode *vp = a->a_vp; 689 struct vnode *dvp = a->a_dvp; 690 struct v7fs_inode *inode = &((struct v7fs_node *)vp->v_data)->inode; 691 struct v7fs_self *fs = v7fsmount->core; 692 int error = 0; 693 694 DPRINTF("delete %s\n", a->a_cnp->cn_nameptr); 695 696 if (vp->v_type == VDIR) { 697 error = EPERM; 698 goto out; 699 } 700 701 if ((error = v7fs_file_deallocate(fs, &parent_node->inode, 702 a->a_cnp->cn_nameptr))) { 703 DPRINTF("v7fs_file_delete failed.\n"); 704 goto out; 705 } 706 error = v7fs_inode_load(fs, inode, inode->inode_number); 707 if (error) 708 goto out; 709 /* Sync dirent size change. */ 710 uvm_vnp_setsize(dvp, v7fs_inode_filesize(&parent_node->inode)); 711 712 out: 713 if (dvp == vp) 714 vrele(vp); /* v_usecount-- of unlocked vp */ 715 else 716 vput(vp); /* unlock vp and then v_usecount-- */ 717 vput(dvp); 718 719 return error; 720 } 721 722 int 723 v7fs_link(void *v) 724 { 725 struct vop_link_v2_args /* { 726 struct vnode *a_dvp; 727 struct vnode *a_vp; 728 struct componentname *a_cnp; 729 } */ *a = v; 730 struct vnode *dvp = a->a_dvp; 731 struct vnode *vp = a->a_vp; 732 struct v7fs_node *parent_node = dvp->v_data; 733 struct v7fs_node *node = vp->v_data; 734 struct v7fs_inode *parent = &parent_node->inode; 735 struct v7fs_inode *p = &node->inode; 736 struct v7fs_self *fs = node->v7fsmount->core; 737 struct componentname *cnp = a->a_cnp; 738 int error = 0; 739 740 DPRINTF("%p\n", vp); 741 /* Lock soruce file */ 742 if ((error = vn_lock(vp, LK_EXCLUSIVE))) { 743 DPRINTF("lock failed. %p\n", vp); 744 VOP_ABORTOP(dvp, cnp); 745 goto unlock; 746 } 747 error = v7fs_file_link(fs, parent, p, cnp->cn_nameptr); 748 /* Sync dirent size change. */ 749 uvm_vnp_setsize(dvp, v7fs_inode_filesize(&parent_node->inode)); 750 751 VOP_UNLOCK(vp); 752 unlock: 753 return error; 754 } 755 756 int 757 v7fs_rename(void *v) 758 { 759 struct vop_rename_args /* { 760 struct vnode *a_fdvp; from parent-directory 761 struct vnode *a_fvp; from file 762 struct componentname *a_fcnp; 763 struct vnode *a_tdvp; to parent-directory 764 struct vnode *a_tvp; to file 765 struct componentname *a_tcnp; 766 } */ *a = v; 767 struct vnode *fvp = a->a_fvp; 768 struct vnode *tvp = a->a_tvp; 769 struct vnode *fdvp = a->a_fdvp; 770 struct vnode *tdvp = a->a_tdvp; 771 struct v7fs_node *parent_from = fdvp->v_data; 772 struct v7fs_node *parent_to = tdvp->v_data; 773 struct v7fs_node *v7node = fvp->v_data; 774 struct v7fs_self *fs = v7node->v7fsmount->core; 775 const char *from_name = a->a_fcnp->cn_nameptr; 776 const char *to_name = a->a_tcnp->cn_nameptr; 777 int error; 778 779 DPRINTF("%s->%s %p %p\n", from_name, to_name, fvp, tvp); 780 781 if ((fvp->v_mount != tdvp->v_mount) || 782 (tvp && (fvp->v_mount != tvp->v_mount))) { 783 error = EXDEV; 784 DPRINTF("cross-device link\n"); 785 goto out; 786 } 787 // XXXsource file lock? 788 error = v7fs_file_rename(fs, &parent_from->inode, from_name, 789 &parent_to->inode, to_name); 790 /* 'to file' inode may be changed. (hard-linked and it is cached.) 791 t_vnops rename_reg_nodir */ 792 if (error == 0 && tvp) { 793 struct v7fs_inode *inode = 794 &((struct v7fs_node *)tvp->v_data)->inode; 795 796 error = v7fs_inode_load(fs, inode, inode->inode_number); 797 uvm_vnp_setsize(tvp, v7fs_inode_filesize(inode)); 798 } 799 /* Sync dirent size change. */ 800 uvm_vnp_setsize(tdvp, v7fs_inode_filesize(&parent_to->inode)); 801 uvm_vnp_setsize(fdvp, v7fs_inode_filesize(&parent_from->inode)); 802 out: 803 if (tvp) 804 vput(tvp); /* locked on entry */ 805 if (tdvp == tvp) 806 vrele(tdvp); 807 else 808 vput(tdvp); 809 vrele(fdvp); 810 vrele(fvp); 811 812 return error; 813 } 814 815 int 816 v7fs_mkdir(void *v) 817 { 818 struct vop_mkdir_v3_args /* { 819 struct vnode *a_dvp; 820 struct vnode **a_vpp; 821 struct componentname *a_cnp; 822 struct vattr *a_vap; 823 } */ *a = v; 824 struct componentname *cnp = a->a_cnp; 825 kauth_cred_t cr = cnp->cn_cred; 826 struct vnode *dvp = a->a_dvp; 827 struct vattr *va = a->a_vap; 828 struct v7fs_node *parent_node = dvp->v_data; 829 struct v7fs_mount *v7fsmount = parent_node->v7fsmount; 830 struct v7fs_self *fs = v7fsmount->core; 831 struct v7fs_fileattr attr; 832 struct mount *mp = v7fsmount->mountp; 833 v7fs_ino_t ino; 834 int error = 0; 835 836 DPRINTF("\n"); 837 memset(&attr, 0, sizeof(attr)); 838 attr.uid = kauth_cred_geteuid(cr); 839 attr.gid = kauth_cred_getegid(cr); 840 attr.mode = va->va_mode | vtype_to_v7fs_mode(va->va_type); 841 842 if ((error = v7fs_file_allocate(fs, &parent_node->inode, 843 cnp->cn_nameptr, &attr, &ino))) 844 return error; 845 /* Sync dirent size change. */ 846 uvm_vnp_setsize(dvp, v7fs_inode_filesize(&parent_node->inode)); 847 848 if ((error = v7fs_vget(mp, ino, a->a_vpp))) { 849 DPRINTF("can't get vnode.\n"); 850 } 851 struct v7fs_node *newnode = (*a->a_vpp)->v_data; 852 newnode->update_ctime = true; 853 newnode->update_mtime = true; 854 newnode->update_atime = true; 855 856 if (error == 0) 857 VOP_UNLOCK(*a->a_vpp); 858 859 return error; 860 } 861 862 int 863 v7fs_rmdir(void *v) 864 { 865 struct vop_rmdir_args /* { 866 struct vnode *a_dvp; 867 struct vnode *a_vp; 868 struct componentname *a_cnp; 869 } */ *a = v; 870 struct vnode *vp = a->a_vp; 871 struct vnode *dvp = a->a_dvp; 872 struct v7fs_node *parent_node = dvp->v_data; 873 struct v7fs_mount *v7fsmount = parent_node->v7fsmount; 874 struct v7fs_inode *inode = &((struct v7fs_node *)vp->v_data)->inode; 875 struct v7fs_self *fs = v7fsmount->core; 876 int error = 0; 877 878 DPRINTF("delete %s\n", a->a_cnp->cn_nameptr); 879 880 KDASSERT(vp->v_type == VDIR); 881 882 if ((error = v7fs_file_deallocate(fs, &parent_node->inode, 883 a->a_cnp->cn_nameptr))) { 884 DPRINTF("v7fs_directory_deallocate failed.\n"); 885 goto out; 886 } 887 error = v7fs_inode_load(fs, inode, inode->inode_number); 888 if (error) 889 goto out; 890 uvm_vnp_setsize(vp, v7fs_inode_filesize(inode)); 891 /* Sync dirent size change. */ 892 uvm_vnp_setsize(dvp, v7fs_inode_filesize(&parent_node->inode)); 893 out: 894 vput(vp); 895 vput(dvp); 896 897 return error; 898 } 899 900 struct v7fs_readdir_arg { 901 struct dirent *dp; 902 struct uio *uio; 903 int start; 904 int end; 905 int cnt; 906 }; 907 static int readdir_subr(struct v7fs_self *, void *, v7fs_daddr_t, size_t); 908 909 int 910 readdir_subr(struct v7fs_self *fs, void *ctx, v7fs_daddr_t blk, size_t sz) 911 { 912 struct v7fs_readdir_arg *p = (struct v7fs_readdir_arg *)ctx; 913 struct v7fs_dirent *dir; 914 struct dirent *dp = p->dp; 915 struct v7fs_inode inode; 916 char filename[V7FS_NAME_MAX + 1]; 917 int i, n; 918 int error = 0; 919 void *buf; 920 921 if (!(buf = scratch_read(fs, blk))) 922 return EIO; 923 dir = (struct v7fs_dirent *)buf; 924 925 n = sz / sizeof(*dir); 926 927 for (i = 0; (i < n) && (p->cnt < p->end); i++, dir++, p->cnt++) { 928 if (p->cnt < p->start) 929 continue; 930 931 if ((error = v7fs_inode_load(fs, &inode, dir->inode_number))) 932 break; 933 934 v7fs_dirent_filename(filename, dir->name); 935 936 DPRINTF("inode=%d name=%s %s\n", dir->inode_number, filename, 937 v7fs_inode_isdir(&inode) ? "DIR" : "FILE"); 938 memset(dp, 0, sizeof(*dp)); 939 dp->d_fileno = dir->inode_number; 940 dp->d_type = v7fs_mode_to_d_type(inode.mode); 941 dp->d_namlen = strlen(filename); 942 strcpy(dp->d_name, filename); 943 dp->d_reclen = sizeof(*dp); 944 if ((error = uiomove(dp, dp->d_reclen, p->uio))) { 945 DPRINTF("uiomove failed.\n"); 946 break; 947 } 948 } 949 scratch_free(fs, buf); 950 951 if (p->cnt == p->end) 952 return V7FS_ITERATOR_BREAK; 953 954 return error; 955 } 956 957 int 958 v7fs_readdir(void *v) 959 { 960 struct vop_readdir_args /* { 961 struct vnode *a_vp; 962 struct uio *a_uio; 963 kauth_cred_t a_cred; 964 int *a_eofflag; 965 off_t **a_cookies; 966 int *a_ncookies; 967 } */ *a = v; 968 struct uio *uio = a->a_uio; 969 struct vnode *vp = a->a_vp; 970 struct v7fs_node *v7node = vp->v_data; 971 struct v7fs_inode *inode = &v7node->inode; 972 struct v7fs_self *fs = v7node->v7fsmount->core; 973 struct dirent *dp; 974 int error; 975 976 DPRINTF("offset=%zu residue=%zu\n", uio->uio_offset, uio->uio_resid); 977 978 KDASSERT(vp->v_type == VDIR); 979 KDASSERT(uio->uio_offset >= 0); 980 KDASSERT(v7fs_inode_isdir(inode)); 981 982 struct v7fs_readdir_arg arg; 983 arg.start = uio->uio_offset / sizeof(*dp); 984 arg.end = arg.start + uio->uio_resid / sizeof(*dp); 985 if (arg.start == arg.end) {/* user buffer has not enuf space. */ 986 DPRINTF("uio buffer too small\n"); 987 return ENOMEM; 988 } 989 dp = kmem_zalloc(sizeof(*dp), KM_SLEEP); 990 arg.cnt = 0; 991 arg.dp = dp; 992 arg.uio = uio; 993 994 *a->a_eofflag = false; 995 error = v7fs_datablock_foreach(fs, inode, readdir_subr, &arg); 996 if (error == V7FS_ITERATOR_END) { 997 *a->a_eofflag = true; 998 } 999 if (error < 0) 1000 error = 0; 1001 1002 kmem_free(dp, sizeof(*dp)); 1003 1004 return error; 1005 } 1006 1007 int 1008 v7fs_inactive(void *v) 1009 { 1010 struct vop_inactive_args /* { 1011 struct vnode *a_vp; 1012 bool *a_recycle; 1013 } */ *a = v; 1014 struct vnode *vp = a->a_vp; 1015 struct v7fs_node *v7node = vp->v_data; 1016 struct v7fs_inode *inode = &v7node->inode; 1017 1018 DPRINTF("%p #%d\n", vp, inode->inode_number); 1019 if (v7fs_inode_nlink(inode) > 0) { 1020 v7fs_update(vp, 0, 0, UPDATE_WAIT); 1021 *a->a_recycle = false; 1022 } else { 1023 *a->a_recycle = true; 1024 } 1025 1026 VOP_UNLOCK(vp); 1027 1028 return 0; 1029 } 1030 1031 int 1032 v7fs_reclaim(void *v) 1033 { 1034 /*This vnode is no longer referenced by kernel. */ 1035 extern struct pool v7fs_node_pool; 1036 struct vop_reclaim_args /* { 1037 struct vnode *a_vp; 1038 } */ *a = v; 1039 struct vnode *vp = a->a_vp; 1040 struct v7fs_node *v7node = vp->v_data; 1041 struct v7fs_self *fs = v7node->v7fsmount->core; 1042 struct v7fs_inode *inode = &v7node->inode; 1043 1044 DPRINTF("%p #%d\n", vp, inode->inode_number); 1045 if (v7fs_inode_nlink(inode) == 0) { 1046 v7fs_datablock_size_change(fs, 0, inode); 1047 DPRINTF("remove datablock\n"); 1048 v7fs_inode_deallocate(fs, inode->inode_number); 1049 DPRINTF("remove inode\n"); 1050 } 1051 genfs_node_destroy(vp); 1052 pool_put(&v7fs_node_pool, v7node); 1053 mutex_enter(vp->v_interlock); 1054 vp->v_data = NULL; 1055 mutex_exit(vp->v_interlock); 1056 1057 return 0; 1058 } 1059 1060 int 1061 v7fs_bmap(void *v) 1062 { 1063 struct vop_bmap_args /* { 1064 struct vnode *a_vp; 1065 daddr_t a_bn; 1066 struct vnode **a_vpp; 1067 daddr_t *a_bnp; 1068 int *a_runp; 1069 } */ *a = v; 1070 struct vnode *vp = a->a_vp; 1071 struct v7fs_node *v7node = vp->v_data; 1072 struct v7fs_mount *v7fsmount = v7node->v7fsmount; 1073 struct v7fs_self *fs = v7node->v7fsmount->core; 1074 struct v7fs_inode *inode = &v7node->inode; 1075 int error = 0; 1076 1077 DPRINTF("inode=%d offset=%zu %p\n", inode->inode_number, a->a_bn, vp); 1078 DPRINTF("filesize: %d\n", inode->filesize); 1079 if (!a->a_bnp) 1080 return 0; 1081 1082 v7fs_daddr_t blk; 1083 if (!(blk = v7fs_datablock_last(fs, inode, 1084 (a->a_bn + 1) << V7FS_BSHIFT))) { 1085 /* +1 converts block # to file offset. */ 1086 return ENOSPC; 1087 } 1088 1089 *a->a_bnp = blk; 1090 1091 if (a->a_vpp) 1092 *a->a_vpp = v7fsmount->devvp; 1093 if (a->a_runp) 1094 *a->a_runp = 0; /*XXX TODO */ 1095 1096 DPRINTF("%d %zu->%zu status=%d\n", inode->inode_number, a->a_bn, 1097 *a->a_bnp, error); 1098 1099 return error; 1100 } 1101 1102 int 1103 v7fs_strategy(void *v) 1104 { 1105 struct vop_strategy_args /* { 1106 struct vnode *a_vp; 1107 struct buf *a_bp; 1108 } */ *a = v; 1109 struct buf *b = a->a_bp; 1110 struct vnode *vp = a->a_vp; 1111 struct v7fs_node *v7node = vp->v_data; 1112 struct v7fs_mount *v7fsmount = v7node->v7fsmount; 1113 int error; 1114 1115 DPRINTF("%p\n", vp); 1116 KDASSERT(vp->v_type == VREG); 1117 if (b->b_blkno == b->b_lblkno) { 1118 error = VOP_BMAP(vp, b->b_lblkno, NULL, &b->b_blkno, NULL); 1119 if (error) { 1120 b->b_error = error; 1121 biodone(b); 1122 return error; 1123 } 1124 if ((long)b->b_blkno == -1) 1125 clrbuf(b); 1126 } 1127 if ((long)b->b_blkno == -1) { 1128 biodone(b); 1129 return 0; 1130 } 1131 1132 return VOP_STRATEGY(v7fsmount->devvp, b); 1133 } 1134 1135 int 1136 v7fs_print(void *v) 1137 { 1138 struct vop_print_args /* { 1139 struct vnode *a_vp; 1140 } */ *a = v; 1141 struct v7fs_node *v7node = a->a_vp->v_data; 1142 1143 v7fs_inode_dump(&v7node->inode); 1144 1145 return 0; 1146 } 1147 1148 int 1149 v7fs_advlock(void *v) 1150 { 1151 struct vop_advlock_args /* { 1152 struct vnode *a_vp; 1153 void *a_id; 1154 int a_op; 1155 struct flock *a_fl; 1156 int a_flags; 1157 } */ *a = v; 1158 struct v7fs_node *v7node = a->a_vp->v_data; 1159 1160 DPRINTF("op=%d\n", a->a_op); 1161 1162 return lf_advlock(a, &v7node->lockf, 1163 v7fs_inode_filesize(&v7node->inode)); 1164 } 1165 1166 int 1167 v7fs_pathconf(void *v) 1168 { 1169 struct vop_pathconf_args /* { 1170 struct vnode *a_vp; 1171 int a_name; 1172 register_t *a_retval; 1173 } */ *a = v; 1174 int err = 0; 1175 1176 DPRINTF("%p\n", a->a_vp); 1177 1178 switch (a->a_name) { 1179 case _PC_LINK_MAX: 1180 *a->a_retval = V7FS_LINK_MAX; 1181 break; 1182 case _PC_NAME_MAX: 1183 *a->a_retval = V7FS_NAME_MAX; 1184 break; 1185 case _PC_PATH_MAX: 1186 *a->a_retval = V7FS_PATH_MAX; 1187 break; 1188 case _PC_CHOWN_RESTRICTED: 1189 *a->a_retval = 1; 1190 break; 1191 case _PC_NO_TRUNC: 1192 *a->a_retval = 0; 1193 break; 1194 case _PC_SYNC_IO: 1195 *a->a_retval = 1; 1196 break; 1197 case _PC_FILESIZEBITS: 1198 *a->a_retval = 30; /* ~1G */ 1199 break; 1200 case _PC_SYMLINK_MAX: 1201 *a->a_retval = V7FSBSD_MAXSYMLINKLEN; 1202 break; 1203 case _PC_2_SYMLINKS: 1204 *a->a_retval = 1; 1205 break; 1206 default: 1207 err = EINVAL; 1208 break; 1209 } 1210 1211 return err; 1212 } 1213 1214 int 1215 v7fs_update(struct vnode *vp, const struct timespec *acc, 1216 const struct timespec *mod, int flags) 1217 { 1218 struct v7fs_node *v7node = vp->v_data; 1219 struct v7fs_inode *inode = &v7node->inode; 1220 struct v7fs_self *fs = v7node->v7fsmount->core; 1221 bool update = false; 1222 1223 DPRINTF("%p %zu %d\n", vp, vp->v_size, v7fs_inode_filesize(inode)); 1224 KDASSERT(vp->v_size == v7fs_inode_filesize(inode)); 1225 1226 if (v7node->update_atime) { 1227 inode->atime = acc ? acc->tv_sec : time_second; 1228 v7node->update_atime = false; 1229 update = true; 1230 } 1231 if (v7node->update_ctime) { 1232 inode->ctime = time_second; 1233 v7node->update_ctime = false; 1234 update = true; 1235 } 1236 if (v7node->update_mtime) { 1237 inode->mtime = mod ? mod->tv_sec : time_second; 1238 v7node->update_mtime = false; 1239 update = true; 1240 } 1241 1242 if (update) 1243 v7fs_inode_writeback(fs, inode); 1244 1245 return 0; 1246 } 1247 1248 int 1249 v7fs_symlink(void *v) 1250 { 1251 struct vop_symlink_v3_args /* { 1252 struct vnode *a_dvp; 1253 struct vnode **a_vpp; 1254 struct componentname *a_cnp; 1255 struct vattr *a_vap; 1256 char *a_target; 1257 } */ *a = v; 1258 struct v7fs_node *parent_node = a->a_dvp->v_data; 1259 struct v7fs_mount *v7fsmount = parent_node->v7fsmount; 1260 struct v7fs_self *fs = v7fsmount->core; 1261 struct vattr *va = a->a_vap; 1262 kauth_cred_t cr = a->a_cnp->cn_cred; 1263 struct componentname *cnp = a->a_cnp; 1264 struct v7fs_fileattr attr; 1265 v7fs_ino_t ino; 1266 const char *from = a->a_target; 1267 const char *to = cnp->cn_nameptr; 1268 size_t len = strlen(from) + 1; 1269 int error = 0; 1270 1271 if (len > V7FS_BSIZE) { /* limited to 512byte pathname */ 1272 DPRINTF("too long pathname."); 1273 return ENAMETOOLONG; 1274 } 1275 1276 memset(&attr, 0, sizeof(attr)); 1277 attr.uid = kauth_cred_geteuid(cr); 1278 attr.gid = kauth_cred_getegid(cr); 1279 attr.mode = va->va_mode | vtype_to_v7fs_mode(va->va_type); 1280 1281 if ((error = v7fs_file_allocate 1282 (fs, &parent_node->inode, to, &attr, &ino))) { 1283 return error; 1284 } 1285 /* Sync dirent size change. */ 1286 uvm_vnp_setsize(a->a_dvp, v7fs_inode_filesize(&parent_node->inode)); 1287 1288 /* Get myself vnode. */ 1289 if ((error = v7fs_vget(v7fsmount->mountp, ino, a->a_vpp))) { 1290 DPRINTF("can't get vnode.\n"); 1291 } 1292 1293 struct v7fs_node *newnode = (*a->a_vpp)->v_data; 1294 struct v7fs_inode *p = &newnode->inode; 1295 v7fs_file_symlink(fs, p, from); 1296 uvm_vnp_setsize(*a->a_vpp, v7fs_inode_filesize(p)); 1297 1298 newnode->update_ctime = true; 1299 newnode->update_mtime = true; 1300 newnode->update_atime = true; 1301 1302 if (error == 0) 1303 VOP_UNLOCK(*a->a_vpp); 1304 1305 return error; 1306 } 1307 1308 int 1309 v7fs_readlink(void *v) 1310 { 1311 struct vop_readlink_args /* { 1312 struct vnode *a_vp; 1313 struct uio *a_uio; 1314 kauth_cred_t a_cred; 1315 } */ *a = v; 1316 struct uio *uio = a->a_uio; 1317 struct vnode *vp = a->a_vp; 1318 struct v7fs_node *v7node = vp->v_data; 1319 struct v7fs_inode *inode = &v7node->inode; 1320 struct v7fs_self *fs = v7node->v7fsmount->core; 1321 int error = 0; 1322 1323 KDASSERT(vp->v_type == VLNK); 1324 KDASSERT(uio->uio_offset >= 0); 1325 KDASSERT(v7fs_inode_islnk(inode)); 1326 1327 v7fs_daddr_t blk = inode->addr[0]; 1328 void *buf; 1329 if (!(buf = scratch_read(fs, blk))) { 1330 error = EIO; 1331 goto error_exit; 1332 } 1333 1334 if ((error = uiomove(buf, strlen(buf), uio))) { 1335 DPRINTF("uiomove failed.\n"); 1336 } 1337 scratch_free(fs, buf); 1338 1339 error_exit: 1340 return error; 1341 } 1342