1 /* $NetBSD: sysvbfs_vfsops.c,v 1.48 2022/05/03 07:34:38 hannken Exp $ */ 2 3 /*- 4 * Copyright (c) 2004 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: sysvbfs_vfsops.c,v 1.48 2022/05/03 07:34:38 hannken Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/pool.h> 39 #include <sys/time.h> 40 #include <sys/ucred.h> 41 #include <sys/mount.h> 42 #include <sys/fcntl.h> 43 #include <sys/malloc.h> 44 #include <sys/kauth.h> 45 #include <sys/proc.h> 46 47 /* v-node */ 48 #include <sys/namei.h> 49 #include <sys/vnode.h> 50 /* devsw */ 51 #include <sys/conf.h> 52 53 #include <fs/sysvbfs/sysvbfs.h> /* external interface */ 54 #include <fs/sysvbfs/bfs.h> /* internal interface */ 55 56 #ifdef SYSVBFS_VNOPS_DEBUG 57 #define DPRINTF(fmt, args...) printf(fmt, ##args) 58 #else 59 #define DPRINTF(arg...) ((void)0) 60 #endif 61 62 MALLOC_JUSTDEFINE(M_SYSVBFS_VFS, "sysvbfs vfs", "sysvbfs vfs structures"); 63 64 struct pool sysvbfs_node_pool; 65 66 int sysvbfs_mountfs(struct vnode *, struct mount *, struct lwp *); 67 68 int 69 sysvbfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 70 { 71 struct lwp *l = curlwp; 72 struct sysvbfs_args *args = data; 73 struct sysvbfs_mount *bmp = NULL; 74 struct vnode *devvp = NULL; 75 int error = 0; 76 bool update; 77 78 DPRINTF("%s: mnt_flag=%x\n", __func__, mp->mnt_flag); 79 80 if (args == NULL) 81 return EINVAL; 82 if (*data_len < sizeof *args) 83 return EINVAL; 84 85 if (mp->mnt_flag & MNT_GETARGS) { 86 if ((bmp = (struct sysvbfs_mount *)mp->mnt_data) == NULL) 87 return EIO; 88 args->fspec = NULL; 89 *data_len = sizeof *args; 90 return 0; 91 } 92 93 94 DPRINTF("%s: args->fspec=%s\n", __func__, args->fspec); 95 update = mp->mnt_flag & MNT_UPDATE; 96 if (args->fspec == NULL) { 97 /* nothing to do. */ 98 return EINVAL; 99 } 100 101 if (args->fspec != NULL) { 102 /* Look up the name and verify that it's sane. */ 103 error = namei_simple_user(args->fspec, 104 NSM_FOLLOW_NOEMULROOT, &devvp); 105 if (error != 0) 106 return (error); 107 108 if (!update) { 109 /* 110 * Be sure this is a valid block device 111 */ 112 if (devvp->v_type != VBLK) 113 error = ENOTBLK; 114 else if (bdevsw_lookup(devvp->v_rdev) == NULL) 115 error = ENXIO; 116 } else { 117 /* 118 * Be sure we're still naming the same device 119 * used for our initial mount 120 */ 121 bmp = (struct sysvbfs_mount *)mp->mnt_data; 122 if (devvp != bmp->devvp) 123 error = EINVAL; 124 } 125 } 126 127 /* 128 * If mount by non-root, then verify that user has necessary 129 * permissions on the device. 130 * 131 * Permission to update a mount is checked higher, so here we presume 132 * updating the mount is okay (for example, as far as securelevel goes) 133 * which leaves us with the normal check. 134 */ 135 if (error == 0) { 136 int accessmode = VREAD; 137 if (update ? 138 (mp->mnt_iflag & IMNT_WANTRDWR) != 0 : 139 (mp->mnt_flag & MNT_RDONLY) == 0) 140 accessmode |= VWRITE; 141 142 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 143 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 144 KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, 145 KAUTH_ARG(accessmode)); 146 VOP_UNLOCK(devvp); 147 } 148 149 if (error) { 150 vrele(devvp); 151 return error; 152 } 153 154 if (!update) { 155 if ((error = sysvbfs_mountfs(devvp, mp, l)) != 0) { 156 vrele(devvp); 157 return error; 158 } 159 } else if (mp->mnt_flag & MNT_RDONLY) { 160 /* XXX: r/w -> read only */ 161 } 162 163 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 164 mp->mnt_op->vfs_name, mp, l); 165 } 166 167 int 168 sysvbfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l) 169 { 170 kauth_cred_t cred = l->l_cred; 171 struct sysvbfs_mount *bmp; 172 int error, oflags; 173 174 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 175 error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0); 176 if (error) 177 goto out; 178 179 /* Open block device */ 180 oflags = FREAD; 181 if ((mp->mnt_flag & MNT_RDONLY) == 0) 182 oflags |= FWRITE; 183 if ((error = VOP_OPEN(devvp, oflags, NOCRED)) != 0) 184 goto out; 185 186 bmp = malloc(sizeof(*bmp), M_SYSVBFS_VFS, M_WAITOK | M_ZERO); 187 bmp->devvp = devvp; 188 bmp->mountp = mp; 189 if ((error = sysvbfs_bfs_init(&bmp->bfs, devvp)) != 0) { 190 free(bmp, M_SYSVBFS_VFS); 191 VOP_CLOSE(devvp, oflags, NOCRED); 192 goto out; 193 } 194 195 mp->mnt_data = bmp; 196 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)devvp->v_rdev; 197 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_SYSVBFS); 198 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 199 mp->mnt_stat.f_namemax = BFS_FILENAME_MAXLEN; 200 mp->mnt_flag |= MNT_LOCAL; 201 mp->mnt_dev_bshift = BFS_BSHIFT; 202 mp->mnt_fs_bshift = BFS_BSHIFT; 203 204 out: 205 VOP_UNLOCK(devvp); 206 return error; 207 } 208 209 int 210 sysvbfs_start(struct mount *mp, int flags) 211 { 212 213 DPRINTF("%s:\n", __func__); 214 /* Nothing to do. */ 215 return 0; 216 } 217 218 int 219 sysvbfs_unmount(struct mount *mp, int mntflags) 220 { 221 struct sysvbfs_mount *bmp = (void *)mp->mnt_data; 222 int error; 223 224 DPRINTF("%s: %p\n", __func__, bmp); 225 226 if ((error = vflush(mp, NULLVP, 227 mntflags & MNT_FORCE ? FORCECLOSE : 0)) != 0) 228 return error; 229 230 vn_lock(bmp->devvp, LK_EXCLUSIVE | LK_RETRY); 231 error = VOP_CLOSE(bmp->devvp, FREAD, NOCRED); 232 vput(bmp->devvp); 233 234 sysvbfs_bfs_fini(bmp->bfs); 235 236 free(bmp, M_SYSVBFS_VFS); 237 mp->mnt_data = NULL; 238 mp->mnt_flag &= ~MNT_LOCAL; 239 240 return 0; 241 } 242 243 int 244 sysvbfs_root(struct mount *mp, int lktype, struct vnode **vpp) 245 { 246 struct vnode *vp; 247 int error; 248 249 DPRINTF("%s:\n", __func__); 250 if ((error = VFS_VGET(mp, BFS_ROOT_INODE, lktype, &vp)) != 0) 251 return error; 252 *vpp = vp; 253 254 return 0; 255 } 256 257 int 258 sysvbfs_statvfs(struct mount *mp, struct statvfs *f) 259 { 260 struct sysvbfs_mount *bmp = mp->mnt_data; 261 struct bfs *bfs = bmp->bfs; 262 int free_block; 263 size_t data_block; 264 265 data_block = (bfs->data_end - bfs->data_start) >> BFS_BSHIFT; 266 if (bfs_inode_alloc(bfs, 0, 0, &free_block) != 0) 267 free_block = 0; 268 else 269 free_block = (bfs->data_end >> BFS_BSHIFT) - free_block; 270 271 DPRINTF("%s: %d %d %d\n", __func__, bfs->data_start, 272 bfs->data_end, free_block); 273 274 f->f_bsize = BFS_BSIZE; 275 f->f_frsize = BFS_BSIZE; 276 f->f_iosize = BFS_BSIZE; 277 f->f_blocks = data_block; 278 f->f_bfree = free_block; 279 f->f_bavail = f->f_bfree; 280 f->f_bresvd = 0; 281 f->f_files = bfs->max_inode; 282 f->f_ffree = bfs->max_inode - bfs->n_inode; 283 f->f_favail = f->f_ffree; 284 f->f_fresvd = 0; 285 copy_statvfs_info(f, mp); 286 287 return 0; 288 } 289 290 int 291 sysvbfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 292 { 293 struct vnode_iterator *marker; 294 struct vnode *vp; 295 int err, error; 296 297 DPRINTF("%s:\n", __func__); 298 error = 0; 299 vfs_vnode_iterator_init(mp, &marker); 300 while ((vp = vfs_vnode_iterator_next(marker, NULL, NULL)) != NULL) { 301 err = vn_lock(vp, LK_EXCLUSIVE); 302 if (err) { 303 vrele(vp); 304 continue; 305 } 306 err = VOP_FSYNC(vp, cred, FSYNC_WAIT, 0, 0); 307 vput(vp); 308 if (err != 0) 309 error = err; 310 } 311 vfs_vnode_iterator_destroy(marker); 312 313 return error; 314 } 315 316 int 317 sysvbfs_loadvnode(struct mount *mp, struct vnode *vp, 318 const void *key, size_t key_len, const void **new_key) 319 { 320 struct sysvbfs_mount *bmp; 321 struct bfs *bfs; 322 struct sysvbfs_node *bnode; 323 struct bfs_inode *inode; 324 uint16_t ino; 325 326 KASSERT(key_len == sizeof(ino)); 327 memcpy(&ino, key, key_len); 328 329 DPRINTF("%s: i-node=%u\n", __func__, ino); 330 331 bmp = mp->mnt_data; 332 bfs = bmp->bfs; 333 334 /* Lookup requested i-node */ 335 if (!bfs_inode_lookup(bfs, ino, &inode)) { 336 DPRINTF("%s: bfs_inode_lookup failed.\n", __func__); 337 return ENOENT; 338 } 339 340 bnode = pool_get(&sysvbfs_node_pool, PR_WAITOK); 341 memset(bnode, 0, sizeof(*bnode)); 342 343 vp->v_tag = VT_SYSVBFS; 344 vp->v_op = sysvbfs_vnodeop_p; 345 vp->v_data = bnode; 346 if (ino == BFS_ROOT_INODE) { /* BFS is flat filesystem */ 347 vp->v_type = VDIR; 348 vp->v_vflag |= VV_ROOT; 349 } else { 350 vp->v_type = VREG; 351 } 352 353 bnode->vnode = vp; 354 bnode->bmp = bmp; 355 bnode->inode = inode; 356 bnode->lockf = NULL; /* advlock */ 357 358 genfs_node_init(vp, &sysvbfs_genfsops); 359 uvm_vnp_setsize(vp, bfs_file_size(inode)); 360 361 *new_key = &bnode->inode->number; 362 363 return 0; 364 } 365 366 int 367 sysvbfs_vget(struct mount *mp, ino_t ino, int lktype, struct vnode **vpp) 368 { 369 int error; 370 uint16_t number; 371 struct vnode *vp; 372 373 KASSERT(ino <= UINT16_MAX); 374 number = ino; 375 376 DPRINTF("%s: i-node=%u\n", __func__, number); 377 378 error = vcache_get(mp, &number, sizeof(number), &vp); 379 if (error) 380 return error; 381 error = vn_lock(vp, lktype); 382 if (error) { 383 vrele(vp); 384 return error; 385 } 386 387 *vpp = vp; 388 389 return 0; 390 } 391 392 int 393 sysvbfs_fhtovp(struct mount *mp, struct fid *fid, int lktype, 394 struct vnode **vpp) 395 { 396 397 DPRINTF("%s:\n", __func__); 398 /* notyet */ 399 return EOPNOTSUPP; 400 } 401 402 int 403 sysvbfs_vptofh(struct vnode *vpp, struct fid *fid, size_t *fh_size) 404 { 405 406 DPRINTF("%s:\n", __func__); 407 /* notyet */ 408 return EOPNOTSUPP; 409 } 410 411 MALLOC_DECLARE(M_BFS); 412 MALLOC_DECLARE(M_SYSVBFS_VNODE); 413 414 void 415 sysvbfs_init(void) 416 { 417 418 DPRINTF("%s:\n", __func__); 419 malloc_type_attach(M_SYSVBFS_VFS); 420 malloc_type_attach(M_BFS); 421 malloc_type_attach(M_SYSVBFS_VNODE); 422 pool_init(&sysvbfs_node_pool, sizeof(struct sysvbfs_node), 0, 0, 0, 423 "sysvbfs_node_pool", &pool_allocator_nointr, IPL_NONE); 424 } 425 426 void 427 sysvbfs_reinit(void) 428 { 429 430 /* Nothing to do. */ 431 DPRINTF("%s:\n", __func__); 432 } 433 434 void 435 sysvbfs_done(void) 436 { 437 438 DPRINTF("%s:\n", __func__); 439 pool_destroy(&sysvbfs_node_pool); 440 malloc_type_detach(M_BFS); 441 malloc_type_detach(M_SYSVBFS_VFS); 442 malloc_type_detach(M_SYSVBFS_VNODE); 443 } 444 445 int 446 sysvbfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, 447 kauth_cred_t cred) 448 { 449 450 return 0; 451 } 452
Indexes created Sun Sep 21 16:09:51 GMT 2025