1 /* $NetBSD: v7fs_vnops.c,v 1.26 2017/05/26 14:21:01 riastradh 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 1.26 2017/05/26 14:21:01 riastradh 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 v7node->update_mtime = true; 505 v7node->update_ctime = true; 506 } 507 } 508 uid_t uid = inode->uid; 509 gid_t gid = inode->gid; 510 511 if (vap->va_uid != (uid_t)VNOVAL) { 512 uid = vap->va_uid; 513 error = kauth_authorize_vnode(cred, 514 KAUTH_VNODE_CHANGE_OWNERSHIP, vp, NULL, 515 genfs_can_chown(cred, inode->uid, inode->gid, uid, 516 gid)); 517 if (error) 518 return error; 519 inode->uid = uid; 520 } 521 if (vap->va_gid != (uid_t)VNOVAL) { 522 gid = vap->va_gid; 523 error = kauth_authorize_vnode(cred, 524 KAUTH_VNODE_CHANGE_OWNERSHIP, vp, NULL, 525 genfs_can_chown(cred, inode->uid, inode->gid, uid, 526 gid)); 527 if (error) 528 return error; 529 inode->gid = gid; 530 } 531 if (vap->va_mode != (mode_t)VNOVAL) { 532 mode_t mode = vap->va_mode; 533 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_SECURITY, 534 vp, NULL, genfs_can_chmod(vp->v_type, cred, inode->uid, inode->gid, 535 mode)); 536 if (error) { 537 return error; 538 } 539 v7fs_inode_chmod(inode, mode); 540 } 541 if ((vap->va_atime.tv_sec != VNOVAL) || 542 (vap->va_mtime.tv_sec != VNOVAL) || 543 (vap->va_ctime.tv_sec != VNOVAL)) { 544 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_TIMES, vp, 545 NULL, genfs_can_chtimes(vp, vap->va_vaflags, inode->uid, 546 cred)); 547 if (error) 548 return error; 549 550 if (vap->va_atime.tv_sec != VNOVAL) { 551 acc = &vap->va_atime; 552 } 553 if (vap->va_mtime.tv_sec != VNOVAL) { 554 mod = &vap->va_mtime; 555 v7node->update_mtime = true; 556 } 557 if (vap->va_ctime.tv_sec != VNOVAL) { 558 v7node->update_ctime = true; 559 } 560 } 561 562 v7node->update_atime = true; 563 v7fs_update(vp, acc, mod, 0); 564 565 return error; 566 } 567 568 int 569 v7fs_read(void *v) 570 { 571 struct vop_read_args /* { 572 struct vnode *a_vp; 573 struct uio *a_uio; 574 int a_ioflag; 575 kauth_cred_t a_cred; 576 } */ *a = v; 577 struct vnode *vp = a->a_vp; 578 struct uio *uio = a->a_uio; 579 struct v7fs_node *v7node = vp->v_data; 580 struct v7fs_inode *inode = &v7node->inode; 581 vsize_t sz, filesz = v7fs_inode_filesize(inode); 582 const int advice = IO_ADV_DECODE(a->a_ioflag); 583 int error = 0; 584 585 DPRINTF("type=%d inode=%d\n", vp->v_type, v7node->inode.inode_number); 586 587 while (uio->uio_resid > 0) { 588 if ((sz = MIN(filesz - uio->uio_offset, uio->uio_resid)) == 0) 589 break; 590 591 error = ubc_uiomove(&vp->v_uobj, uio, sz, advice, UBC_READ | 592 UBC_PARTIALOK | UBC_UNMAP_FLAG(v)); 593 if (error) { 594 break; 595 } 596 DPRINTF("read %zubyte\n", sz); 597 } 598 v7node->update_atime = true; 599 600 return error; 601 } 602 603 int 604 v7fs_write(void *v) 605 { 606 struct vop_write_args /* { 607 struct vnode *a_vp; 608 struct uio *a_uio; 609 int a_ioflag; 610 kauth_cred_t a_cred; 611 } */ *a = v; 612 struct vnode *vp = a->a_vp; 613 struct uio *uio = a->a_uio; 614 int advice = IO_ADV_DECODE(a->a_ioflag); 615 struct v7fs_node *v7node = vp->v_data; 616 struct v7fs_inode *inode = &v7node->inode; 617 struct v7fs_self *fs = v7node->v7fsmount->core; 618 vsize_t sz; 619 int error = 0; 620 621 if (uio->uio_resid == 0) 622 return 0; 623 624 sz = v7fs_inode_filesize(inode); 625 DPRINTF("(i)%ld (v)%zu ofs=%zu + res=%zu = %zu\n", sz, vp->v_size, 626 uio->uio_offset, uio->uio_resid, uio->uio_offset + uio->uio_resid); 627 628 /* Append mode file offset is managed by kernel. */ 629 if (a->a_ioflag & IO_APPEND) 630 uio->uio_offset = sz; 631 632 /* If write region is over filesize, expand. */ 633 size_t newsize= uio->uio_offset + uio->uio_resid; 634 ssize_t expand = newsize - sz; 635 if (expand > 0) { 636 if ((error = v7fs_datablock_expand(fs, inode, expand))) 637 return error; 638 uvm_vnp_setsize(vp, newsize); 639 } 640 641 while (uio->uio_resid > 0) { 642 sz = uio->uio_resid; 643 if ((error = ubc_uiomove(&vp->v_uobj, uio, sz, advice, 644 UBC_WRITE | UBC_UNMAP_FLAG(v)))) 645 break; 646 DPRINTF("write %zubyte\n", sz); 647 } 648 v7node->update_mtime = true; 649 650 return error; 651 } 652 653 int 654 v7fs_fsync(void *v) 655 { 656 struct vop_fsync_args /* { 657 struct vnode *a_vp; 658 kauth_cred_t a_cred; 659 int a_flags; 660 off_t offlo; 661 off_t offhi; 662 } */ *a = v; 663 struct vnode *vp = a->a_vp; 664 int error, wait; 665 666 DPRINTF("%p\n", a->a_vp); 667 if (a->a_flags & FSYNC_CACHE) { 668 return EOPNOTSUPP; 669 } 670 671 wait = (a->a_flags & FSYNC_WAIT); 672 error = vflushbuf(vp, a->a_flags); 673 674 if (error == 0 && (a->a_flags & FSYNC_DATAONLY) == 0) 675 error = v7fs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); 676 677 return error; 678 } 679 680 int 681 v7fs_remove(void *v) 682 { 683 struct vop_remove_v2_args /* { 684 struct vnodeop_desc *a_desc; 685 struct vnode * a_dvp; 686 struct vnode * a_vp; 687 struct componentname * a_cnp; 688 } */ *a = v; 689 struct v7fs_node *parent_node = a->a_dvp->v_data; 690 struct v7fs_mount *v7fsmount = parent_node->v7fsmount; 691 struct vnode *vp = a->a_vp; 692 struct vnode *dvp = a->a_dvp; 693 struct v7fs_inode *inode = &((struct v7fs_node *)vp->v_data)->inode; 694 struct v7fs_self *fs = v7fsmount->core; 695 int error = 0; 696 697 DPRINTF("delete %s\n", a->a_cnp->cn_nameptr); 698 699 if (vp->v_type == VDIR) { 700 error = EPERM; 701 goto out; 702 } 703 704 if ((error = v7fs_file_deallocate(fs, &parent_node->inode, 705 a->a_cnp->cn_nameptr))) { 706 DPRINTF("v7fs_file_delete failed.\n"); 707 goto out; 708 } 709 error = v7fs_inode_load(fs, inode, inode->inode_number); 710 if (error) 711 goto out; 712 /* Sync dirent size change. */ 713 uvm_vnp_setsize(dvp, v7fs_inode_filesize(&parent_node->inode)); 714 715 out: 716 if (dvp == vp) 717 vrele(vp); /* v_usecount-- of unlocked vp */ 718 else 719 vput(vp); /* unlock vp and then v_usecount-- */ 720 721 return error; 722 } 723 724 int 725 v7fs_link(void *v) 726 { 727 struct vop_link_v2_args /* { 728 struct vnode *a_dvp; 729 struct vnode *a_vp; 730 struct componentname *a_cnp; 731 } */ *a = v; 732 struct vnode *dvp = a->a_dvp; 733 struct vnode *vp = a->a_vp; 734 struct v7fs_node *parent_node = dvp->v_data; 735 struct v7fs_node *node = vp->v_data; 736 struct v7fs_inode *parent = &parent_node->inode; 737 struct v7fs_inode *p = &node->inode; 738 struct v7fs_self *fs = node->v7fsmount->core; 739 struct componentname *cnp = a->a_cnp; 740 int error = 0; 741 742 DPRINTF("%p\n", vp); 743 /* Lock soruce file */ 744 if ((error = vn_lock(vp, LK_EXCLUSIVE))) { 745 DPRINTF("lock failed. %p\n", vp); 746 VOP_ABORTOP(dvp, cnp); 747 goto unlock; 748 } 749 error = v7fs_file_link(fs, parent, p, cnp->cn_nameptr); 750 /* Sync dirent size change. */ 751 uvm_vnp_setsize(dvp, v7fs_inode_filesize(&parent_node->inode)); 752 753 VOP_UNLOCK(vp); 754 unlock: 755 return error; 756 } 757 758 int 759 v7fs_rename(void *v) 760 { 761 struct vop_rename_args /* { 762 struct vnode *a_fdvp; from parent-directory 763 struct vnode *a_fvp; from file 764 struct componentname *a_fcnp; 765 struct vnode *a_tdvp; to parent-directory 766 struct vnode *a_tvp; to file 767 struct componentname *a_tcnp; 768 } */ *a = v; 769 struct vnode *fvp = a->a_fvp; 770 struct vnode *tvp = a->a_tvp; 771 struct vnode *fdvp = a->a_fdvp; 772 struct vnode *tdvp = a->a_tdvp; 773 struct v7fs_node *parent_from = fdvp->v_data; 774 struct v7fs_node *parent_to = tdvp->v_data; 775 struct v7fs_node *v7node = fvp->v_data; 776 struct v7fs_self *fs = v7node->v7fsmount->core; 777 const char *from_name = a->a_fcnp->cn_nameptr; 778 const char *to_name = a->a_tcnp->cn_nameptr; 779 int error; 780 781 DPRINTF("%s->%s %p %p\n", from_name, to_name, fvp, tvp); 782 783 if ((fvp->v_mount != tdvp->v_mount) || 784 (tvp && (fvp->v_mount != tvp->v_mount))) { 785 error = EXDEV; 786 DPRINTF("cross-device link\n"); 787 goto out; 788 } 789 // XXXsource file lock? 790 error = v7fs_file_rename(fs, &parent_from->inode, from_name, 791 &parent_to->inode, to_name); 792 /* 'to file' inode may be changed. (hard-linked and it is cached.) 793 t_vnops rename_reg_nodir */ 794 if (error == 0 && tvp) { 795 struct v7fs_inode *inode = 796 &((struct v7fs_node *)tvp->v_data)->inode; 797 798 error = v7fs_inode_load(fs, inode, inode->inode_number); 799 uvm_vnp_setsize(tvp, v7fs_inode_filesize(inode)); 800 } 801 /* Sync dirent size change. */ 802 uvm_vnp_setsize(tdvp, v7fs_inode_filesize(&parent_to->inode)); 803 uvm_vnp_setsize(fdvp, v7fs_inode_filesize(&parent_from->inode)); 804 out: 805 if (tvp) 806 vput(tvp); /* locked on entry */ 807 if (tdvp == tvp) 808 vrele(tdvp); 809 else 810 vput(tdvp); 811 vrele(fdvp); 812 vrele(fvp); 813 814 return error; 815 } 816 817 int 818 v7fs_mkdir(void *v) 819 { 820 struct vop_mkdir_v3_args /* { 821 struct vnode *a_dvp; 822 struct vnode **a_vpp; 823 struct componentname *a_cnp; 824 struct vattr *a_vap; 825 } */ *a = v; 826 struct componentname *cnp = a->a_cnp; 827 kauth_cred_t cr = cnp->cn_cred; 828 struct vnode *dvp = a->a_dvp; 829 struct vattr *va = a->a_vap; 830 struct v7fs_node *parent_node = dvp->v_data; 831 struct v7fs_mount *v7fsmount = parent_node->v7fsmount; 832 struct v7fs_self *fs = v7fsmount->core; 833 struct v7fs_fileattr attr; 834 struct mount *mp = v7fsmount->mountp; 835 v7fs_ino_t ino; 836 int error = 0; 837 838 DPRINTF("\n"); 839 memset(&attr, 0, sizeof(attr)); 840 attr.uid = kauth_cred_geteuid(cr); 841 attr.gid = kauth_cred_getegid(cr); 842 attr.mode = va->va_mode | vtype_to_v7fs_mode(va->va_type); 843 844 if ((error = v7fs_file_allocate(fs, &parent_node->inode, 845 cnp->cn_nameptr, &attr, &ino))) 846 return error; 847 /* Sync dirent size change. */ 848 uvm_vnp_setsize(dvp, v7fs_inode_filesize(&parent_node->inode)); 849 850 if ((error = v7fs_vget(mp, ino, a->a_vpp))) { 851 DPRINTF("can't get vnode.\n"); 852 } 853 struct v7fs_node *newnode = (*a->a_vpp)->v_data; 854 newnode->update_ctime = true; 855 newnode->update_mtime = true; 856 newnode->update_atime = true; 857 858 if (error == 0) 859 VOP_UNLOCK(*a->a_vpp); 860 861 return error; 862 } 863 864 int 865 v7fs_rmdir(void *v) 866 { 867 struct vop_rmdir_v2_args /* { 868 struct vnode *a_dvp; 869 struct vnode *a_vp; 870 struct componentname *a_cnp; 871 } */ *a = v; 872 struct vnode *vp = a->a_vp; 873 struct vnode *dvp = a->a_dvp; 874 struct v7fs_node *parent_node = dvp->v_data; 875 struct v7fs_mount *v7fsmount = parent_node->v7fsmount; 876 struct v7fs_inode *inode = &((struct v7fs_node *)vp->v_data)->inode; 877 struct v7fs_self *fs = v7fsmount->core; 878 int error = 0; 879 880 DPRINTF("delete %s\n", a->a_cnp->cn_nameptr); 881 882 KDASSERT(vp->v_type == VDIR); 883 884 if ((error = v7fs_file_deallocate(fs, &parent_node->inode, 885 a->a_cnp->cn_nameptr))) { 886 DPRINTF("v7fs_directory_deallocate failed.\n"); 887 goto out; 888 } 889 error = v7fs_inode_load(fs, inode, inode->inode_number); 890 if (error) 891 goto out; 892 uvm_vnp_setsize(vp, v7fs_inode_filesize(inode)); 893 /* Sync dirent size change. */ 894 uvm_vnp_setsize(dvp, v7fs_inode_filesize(&parent_node->inode)); 895 out: 896 vput(vp); 897 898 return error; 899 } 900 901 struct v7fs_readdir_arg { 902 struct dirent *dp; 903 struct uio *uio; 904 int start; 905 int end; 906 int cnt; 907 }; 908 static int readdir_subr(struct v7fs_self *, void *, v7fs_daddr_t, size_t); 909 910 int 911 readdir_subr(struct v7fs_self *fs, void *ctx, v7fs_daddr_t blk, size_t sz) 912 { 913 struct v7fs_readdir_arg *p = (struct v7fs_readdir_arg *)ctx; 914 struct v7fs_dirent *dir; 915 struct dirent *dp = p->dp; 916 struct v7fs_inode inode; 917 char filename[V7FS_NAME_MAX + 1]; 918 int i, n; 919 int error = 0; 920 void *buf; 921 922 if (!(buf = scratch_read(fs, blk))) 923 return EIO; 924 dir = (struct v7fs_dirent *)buf; 925 926 n = sz / sizeof(*dir); 927 928 for (i = 0; (i < n) && (p->cnt < p->end); i++, dir++, p->cnt++) { 929 if (p->cnt < p->start) 930 continue; 931 932 if ((error = v7fs_inode_load(fs, &inode, dir->inode_number))) 933 break; 934 935 v7fs_dirent_filename(filename, dir->name); 936 937 DPRINTF("inode=%d name=%s %s\n", dir->inode_number, filename, 938 v7fs_inode_isdir(&inode) ? "DIR" : "FILE"); 939 memset(dp, 0, sizeof(*dp)); 940 dp->d_fileno = dir->inode_number; 941 dp->d_type = v7fs_mode_to_d_type(inode.mode); 942 dp->d_namlen = strlen(filename); 943 strcpy(dp->d_name, filename); 944 dp->d_reclen = sizeof(*dp); 945 if ((error = uiomove(dp, dp->d_reclen, p->uio))) { 946 DPRINTF("uiomove failed.\n"); 947 break; 948 } 949 } 950 scratch_free(fs, buf); 951 952 if (p->cnt == p->end) 953 return V7FS_ITERATOR_BREAK; 954 955 return error; 956 } 957 958 int 959 v7fs_readdir(void *v) 960 { 961 struct vop_readdir_args /* { 962 struct vnode *a_vp; 963 struct uio *a_uio; 964 kauth_cred_t a_cred; 965 int *a_eofflag; 966 off_t **a_cookies; 967 int *a_ncookies; 968 } */ *a = v; 969 struct uio *uio = a->a_uio; 970 struct vnode *vp = a->a_vp; 971 struct v7fs_node *v7node = vp->v_data; 972 struct v7fs_inode *inode = &v7node->inode; 973 struct v7fs_self *fs = v7node->v7fsmount->core; 974 struct dirent *dp; 975 int error; 976 977 DPRINTF("offset=%zu residue=%zu\n", uio->uio_offset, uio->uio_resid); 978 979 KDASSERT(vp->v_type == VDIR); 980 KDASSERT(uio->uio_offset >= 0); 981 KDASSERT(v7fs_inode_isdir(inode)); 982 983 struct v7fs_readdir_arg arg; 984 arg.start = uio->uio_offset / sizeof(*dp); 985 arg.end = arg.start + uio->uio_resid / sizeof(*dp); 986 if (arg.start == arg.end) {/* user buffer has not enuf space. */ 987 DPRINTF("uio buffer too small\n"); 988 return ENOMEM; 989 } 990 dp = kmem_zalloc(sizeof(*dp), KM_SLEEP); 991 arg.cnt = 0; 992 arg.dp = dp; 993 arg.uio = uio; 994 995 *a->a_eofflag = false; 996 error = v7fs_datablock_foreach(fs, inode, readdir_subr, &arg); 997 if (error == V7FS_ITERATOR_END) { 998 *a->a_eofflag = true; 999 } 1000 if (error < 0) 1001 error = 0; 1002 1003 kmem_free(dp, sizeof(*dp)); 1004 1005 return error; 1006 } 1007 1008 int 1009 v7fs_inactive(void *v) 1010 { 1011 struct vop_inactive_v2_args /* { 1012 struct vnode *a_vp; 1013 bool *a_recycle; 1014 } */ *a = v; 1015 struct vnode *vp = a->a_vp; 1016 struct v7fs_node *v7node = vp->v_data; 1017 struct v7fs_inode *inode = &v7node->inode; 1018 1019 DPRINTF("%p #%d\n", vp, inode->inode_number); 1020 if (v7fs_inode_nlink(inode) > 0) { 1021 v7fs_update(vp, 0, 0, UPDATE_WAIT); 1022 *a->a_recycle = false; 1023 } else { 1024 *a->a_recycle = true; 1025 } 1026 1027 return 0; 1028 } 1029 1030 int 1031 v7fs_reclaim(void *v) 1032 { 1033 /*This vnode is no longer referenced by kernel. */ 1034 extern struct pool v7fs_node_pool; 1035 struct vop_reclaim_v2_args /* { 1036 struct vnode *a_vp; 1037 } */ *a = v; 1038 struct vnode *vp = a->a_vp; 1039 struct v7fs_node *v7node = vp->v_data; 1040 struct v7fs_self *fs = v7node->v7fsmount->core; 1041 struct v7fs_inode *inode = &v7node->inode; 1042 1043 VOP_UNLOCK(vp); 1044 1045 DPRINTF("%p #%d\n", vp, inode->inode_number); 1046 if (v7fs_inode_nlink(inode) == 0) { 1047 v7fs_datablock_size_change(fs, 0, inode); 1048 DPRINTF("remove datablock\n"); 1049 v7fs_inode_deallocate(fs, inode->inode_number); 1050 DPRINTF("remove inode\n"); 1051 } 1052 genfs_node_destroy(vp); 1053 pool_put(&v7fs_node_pool, v7node); 1054 mutex_enter(vp->v_interlock); 1055 vp->v_data = NULL; 1056 mutex_exit(vp->v_interlock); 1057 1058 return 0; 1059 } 1060 1061 int 1062 v7fs_bmap(void *v) 1063 { 1064 struct vop_bmap_args /* { 1065 struct vnode *a_vp; 1066 daddr_t a_bn; 1067 struct vnode **a_vpp; 1068 daddr_t *a_bnp; 1069 int *a_runp; 1070 } */ *a = v; 1071 struct vnode *vp = a->a_vp; 1072 struct v7fs_node *v7node = vp->v_data; 1073 struct v7fs_mount *v7fsmount = v7node->v7fsmount; 1074 struct v7fs_self *fs = v7node->v7fsmount->core; 1075 struct v7fs_inode *inode = &v7node->inode; 1076 int error = 0; 1077 1078 DPRINTF("inode=%d offset=%zu %p\n", inode->inode_number, a->a_bn, vp); 1079 DPRINTF("filesize: %d\n", inode->filesize); 1080 if (!a->a_bnp) 1081 return 0; 1082 1083 v7fs_daddr_t blk; 1084 if (!(blk = v7fs_datablock_last(fs, inode, 1085 (a->a_bn + 1) << V7FS_BSHIFT))) { 1086 /* +1 converts block # to file offset. */ 1087 return ENOSPC; 1088 } 1089 1090 *a->a_bnp = blk; 1091 1092 if (a->a_vpp) 1093 *a->a_vpp = v7fsmount->devvp; 1094 if (a->a_runp) 1095 *a->a_runp = 0; /*XXX TODO */ 1096 1097 DPRINTF("%d %zu->%zu status=%d\n", inode->inode_number, a->a_bn, 1098 *a->a_bnp, error); 1099 1100 return error; 1101 } 1102 1103 int 1104 v7fs_strategy(void *v) 1105 { 1106 struct vop_strategy_args /* { 1107 struct vnode *a_vp; 1108 struct buf *a_bp; 1109 } */ *a = v; 1110 struct buf *b = a->a_bp; 1111 struct vnode *vp = a->a_vp; 1112 struct v7fs_node *v7node = vp->v_data; 1113 struct v7fs_mount *v7fsmount = v7node->v7fsmount; 1114 int error; 1115 1116 DPRINTF("%p\n", vp); 1117 KDASSERT(vp->v_type == VREG); 1118 if (b->b_blkno == b->b_lblkno) { 1119 error = VOP_BMAP(vp, b->b_lblkno, NULL, &b->b_blkno, NULL); 1120 if (error) { 1121 b->b_error = error; 1122 biodone(b); 1123 return error; 1124 } 1125 if ((long)b->b_blkno == -1) 1126 clrbuf(b); 1127 } 1128 if ((long)b->b_blkno == -1) { 1129 biodone(b); 1130 return 0; 1131 } 1132 1133 return VOP_STRATEGY(v7fsmount->devvp, b); 1134 } 1135 1136 int 1137 v7fs_print(void *v) 1138 { 1139 struct vop_print_args /* { 1140 struct vnode *a_vp; 1141 } */ *a = v; 1142 struct v7fs_node *v7node = a->a_vp->v_data; 1143 1144 v7fs_inode_dump(&v7node->inode); 1145 1146 return 0; 1147 } 1148 1149 int 1150 v7fs_advlock(void *v) 1151 { 1152 struct vop_advlock_args /* { 1153 struct vnode *a_vp; 1154 void *a_id; 1155 int a_op; 1156 struct flock *a_fl; 1157 int a_flags; 1158 } */ *a = v; 1159 struct v7fs_node *v7node = a->a_vp->v_data; 1160 1161 DPRINTF("op=%d\n", a->a_op); 1162 1163 return lf_advlock(a, &v7node->lockf, 1164 v7fs_inode_filesize(&v7node->inode)); 1165 } 1166 1167 int 1168 v7fs_pathconf(void *v) 1169 { 1170 struct vop_pathconf_args /* { 1171 struct vnode *a_vp; 1172 int a_name; 1173 register_t *a_retval; 1174 } */ *a = v; 1175 int err = 0; 1176 1177 DPRINTF("%p\n", a->a_vp); 1178 1179 switch (a->a_name) { 1180 case _PC_LINK_MAX: 1181 *a->a_retval = V7FS_LINK_MAX; 1182 break; 1183 case _PC_NAME_MAX: 1184 *a->a_retval = V7FS_NAME_MAX; 1185 break; 1186 case _PC_PATH_MAX: 1187 *a->a_retval = V7FS_PATH_MAX; 1188 break; 1189 case _PC_CHOWN_RESTRICTED: 1190 *a->a_retval = 1; 1191 break; 1192 case _PC_NO_TRUNC: 1193 *a->a_retval = 0; 1194 break; 1195 case _PC_SYNC_IO: 1196 *a->a_retval = 1; 1197 break; 1198 case _PC_FILESIZEBITS: 1199 *a->a_retval = 30; /* ~1G */ 1200 break; 1201 case _PC_SYMLINK_MAX: 1202 *a->a_retval = V7FSBSD_MAXSYMLINKLEN; 1203 break; 1204 case _PC_2_SYMLINKS: 1205 *a->a_retval = 1; 1206 break; 1207 default: 1208 err = EINVAL; 1209 break; 1210 } 1211 1212 return err; 1213 } 1214 1215 int 1216 v7fs_update(struct vnode *vp, const struct timespec *acc, 1217 const struct timespec *mod, int flags) 1218 { 1219 struct v7fs_node *v7node = vp->v_data; 1220 struct v7fs_inode *inode = &v7node->inode; 1221 struct v7fs_self *fs = v7node->v7fsmount->core; 1222 bool update = false; 1223 1224 DPRINTF("%p %zu %d\n", vp, vp->v_size, v7fs_inode_filesize(inode)); 1225 KDASSERT(vp->v_size == v7fs_inode_filesize(inode)); 1226 1227 if (v7node->update_atime) { 1228 inode->atime = acc ? acc->tv_sec : time_second; 1229 v7node->update_atime = false; 1230 update = true; 1231 } 1232 if (v7node->update_ctime) { 1233 inode->ctime = time_second; 1234 v7node->update_ctime = false; 1235 update = true; 1236 } 1237 if (v7node->update_mtime) { 1238 inode->mtime = mod ? mod->tv_sec : time_second; 1239 v7node->update_mtime = false; 1240 update = true; 1241 } 1242 1243 if (update) 1244 v7fs_inode_writeback(fs, inode); 1245 1246 return 0; 1247 } 1248 1249 int 1250 v7fs_symlink(void *v) 1251 { 1252 struct vop_symlink_v3_args /* { 1253 struct vnode *a_dvp; 1254 struct vnode **a_vpp; 1255 struct componentname *a_cnp; 1256 struct vattr *a_vap; 1257 char *a_target; 1258 } */ *a = v; 1259 struct v7fs_node *parent_node = a->a_dvp->v_data; 1260 struct v7fs_mount *v7fsmount = parent_node->v7fsmount; 1261 struct v7fs_self *fs = v7fsmount->core; 1262 struct vattr *va = a->a_vap; 1263 kauth_cred_t cr = a->a_cnp->cn_cred; 1264 struct componentname *cnp = a->a_cnp; 1265 struct v7fs_fileattr attr; 1266 v7fs_ino_t ino; 1267 const char *from = a->a_target; 1268 const char *to = cnp->cn_nameptr; 1269 size_t len = strlen(from) + 1; 1270 int error = 0; 1271 1272 if (len > V7FS_BSIZE) { /* limited to 512byte pathname */ 1273 DPRINTF("too long pathname."); 1274 return ENAMETOOLONG; 1275 } 1276 1277 memset(&attr, 0, sizeof(attr)); 1278 attr.uid = kauth_cred_geteuid(cr); 1279 attr.gid = kauth_cred_getegid(cr); 1280 attr.mode = va->va_mode | vtype_to_v7fs_mode(va->va_type); 1281 1282 if ((error = v7fs_file_allocate 1283 (fs, &parent_node->inode, to, &attr, &ino))) { 1284 return error; 1285 } 1286 /* Sync dirent size change. */ 1287 uvm_vnp_setsize(a->a_dvp, v7fs_inode_filesize(&parent_node->inode)); 1288 1289 /* Get myself vnode. */ 1290 if ((error = v7fs_vget(v7fsmount->mountp, ino, a->a_vpp))) { 1291 DPRINTF("can't get vnode.\n"); 1292 } 1293 1294 struct v7fs_node *newnode = (*a->a_vpp)->v_data; 1295 struct v7fs_inode *p = &newnode->inode; 1296 v7fs_file_symlink(fs, p, from); 1297 uvm_vnp_setsize(*a->a_vpp, v7fs_inode_filesize(p)); 1298 1299 newnode->update_ctime = true; 1300 newnode->update_mtime = true; 1301 newnode->update_atime = true; 1302 1303 if (error == 0) 1304 VOP_UNLOCK(*a->a_vpp); 1305 1306 return error; 1307 } 1308 1309 int 1310 v7fs_readlink(void *v) 1311 { 1312 struct vop_readlink_args /* { 1313 struct vnode *a_vp; 1314 struct uio *a_uio; 1315 kauth_cred_t a_cred; 1316 } */ *a = v; 1317 struct uio *uio = a->a_uio; 1318 struct vnode *vp = a->a_vp; 1319 struct v7fs_node *v7node = vp->v_data; 1320 struct v7fs_inode *inode = &v7node->inode; 1321 struct v7fs_self *fs = v7node->v7fsmount->core; 1322 int error = 0; 1323 1324 KDASSERT(vp->v_type == VLNK); 1325 KDASSERT(uio->uio_offset >= 0); 1326 KDASSERT(v7fs_inode_islnk(inode)); 1327 1328 v7fs_daddr_t blk = inode->addr[0]; 1329 void *buf; 1330 if (!(buf = scratch_read(fs, blk))) { 1331 error = EIO; 1332 goto error_exit; 1333 } 1334 1335 if ((error = uiomove(buf, strlen(buf), uio))) { 1336 DPRINTF("uiomove failed.\n"); 1337 } 1338 scratch_free(fs, buf); 1339 1340 error_exit: 1341 return error; 1342 } 1343