sysvbfs_vfsops.c revision 1.46.18.1
1 /* $NetBSD: sysvbfs_vfsops.c,v 1.46.18.1 2020/04/08 14:08:50 martin 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 1.46.18.1 2020/04/08 14:08:50 martin 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 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 143 KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, 144 KAUTH_ARG(accessmode)); 145 } 146 147 if (error) { 148 vrele(devvp); 149 return error; 150 } 151 152 if (!update) { 153 if ((error = sysvbfs_mountfs(devvp, mp, l)) != 0) { 154 vrele(devvp); 155 return error; 156 } 157 } else if (mp->mnt_flag & MNT_RDONLY) { 158 /* XXX: r/w -> read only */ 159 } 160 161 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 162 mp->mnt_op->vfs_name, mp, l); 163 } 164 165 int 166 sysvbfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l) 167 { 168 kauth_cred_t cred = l->l_cred; 169 struct sysvbfs_mount *bmp; 170 int error, oflags; 171 172 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 173 error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0); 174 if (error) 175 goto out; 176 177 /* Open block device */ 178 oflags = FREAD; 179 if ((mp->mnt_flag & MNT_RDONLY) == 0) 180 oflags |= FWRITE; 181 if ((error = VOP_OPEN(devvp, oflags, NOCRED)) != 0) 182 goto out; 183 184 bmp = malloc(sizeof(*bmp), M_SYSVBFS_VFS, M_WAITOK | M_ZERO); 185 bmp->devvp = devvp; 186 bmp->mountp = mp; 187 if ((error = sysvbfs_bfs_init(&bmp->bfs, devvp)) != 0) { 188 free(bmp, M_SYSVBFS_VFS); 189 VOP_CLOSE(devvp, oflags, NOCRED); 190 goto out; 191 } 192 193 mp->mnt_data = bmp; 194 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)devvp->v_rdev; 195 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_SYSVBFS); 196 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 197 mp->mnt_stat.f_namemax = BFS_FILENAME_MAXLEN; 198 mp->mnt_flag |= MNT_LOCAL; 199 mp->mnt_dev_bshift = BFS_BSHIFT; 200 mp->mnt_fs_bshift = BFS_BSHIFT; 201 202 out: 203 VOP_UNLOCK(devvp); 204 return error; 205 } 206 207 int 208 sysvbfs_start(struct mount *mp, int flags) 209 { 210 211 DPRINTF("%s:\n", __func__); 212 /* Nothing to do. */ 213 return 0; 214 } 215 216 int 217 sysvbfs_unmount(struct mount *mp, int mntflags) 218 { 219 struct sysvbfs_mount *bmp = (void *)mp->mnt_data; 220 int error; 221 222 DPRINTF("%s: %p\n", __func__, bmp); 223 224 if ((error = vflush(mp, NULLVP, 225 mntflags & MNT_FORCE ? FORCECLOSE : 0)) != 0) 226 return error; 227 228 vn_lock(bmp->devvp, LK_EXCLUSIVE | LK_RETRY); 229 error = VOP_CLOSE(bmp->devvp, FREAD, NOCRED); 230 vput(bmp->devvp); 231 232 sysvbfs_bfs_fini(bmp->bfs); 233 234 free(bmp, M_SYSVBFS_VFS); 235 mp->mnt_data = NULL; 236 mp->mnt_flag &= ~MNT_LOCAL; 237 238 return 0; 239 } 240 241 int 242 sysvbfs_root(struct mount *mp, int lktype, struct vnode **vpp) 243 { 244 struct vnode *vp; 245 int error; 246 247 DPRINTF("%s:\n", __func__); 248 if ((error = VFS_VGET(mp, BFS_ROOT_INODE, lktype, &vp)) != 0) 249 return error; 250 *vpp = vp; 251 252 return 0; 253 } 254 255 int 256 sysvbfs_statvfs(struct mount *mp, struct statvfs *f) 257 { 258 struct sysvbfs_mount *bmp = mp->mnt_data; 259 struct bfs *bfs = bmp->bfs; 260 int free_block; 261 size_t data_block; 262 263 data_block = (bfs->data_end - bfs->data_start) >> BFS_BSHIFT; 264 if (bfs_inode_alloc(bfs, 0, 0, &free_block) != 0) 265 free_block = 0; 266 else 267 free_block = (bfs->data_end >> BFS_BSHIFT) - free_block; 268 269 DPRINTF("%s: %d %d %d\n", __func__, bfs->data_start, 270 bfs->data_end, free_block); 271 272 f->f_bsize = BFS_BSIZE; 273 f->f_frsize = BFS_BSIZE; 274 f->f_iosize = BFS_BSIZE; 275 f->f_blocks = data_block; 276 f->f_bfree = free_block; 277 f->f_bavail = f->f_bfree; 278 f->f_bresvd = 0; 279 f->f_files = bfs->max_inode; 280 f->f_ffree = bfs->max_inode - bfs->n_inode; 281 f->f_favail = f->f_ffree; 282 f->f_fresvd = 0; 283 copy_statvfs_info(f, mp); 284 285 return 0; 286 } 287 288 int 289 sysvbfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 290 { 291 struct vnode_iterator *marker; 292 struct vnode *vp; 293 int err, error; 294 295 DPRINTF("%s:\n", __func__); 296 error = 0; 297 vfs_vnode_iterator_init(mp, &marker); 298 while ((vp = vfs_vnode_iterator_next(marker, NULL, NULL)) != NULL) { 299 err = vn_lock(vp, LK_EXCLUSIVE); 300 if (err) { 301 vrele(vp); 302 continue; 303 } 304 err = VOP_FSYNC(vp, cred, FSYNC_WAIT, 0, 0); 305 vput(vp); 306 if (err != 0) 307 error = err; 308 } 309 vfs_vnode_iterator_destroy(marker); 310 311 return error; 312 } 313 314 int 315 sysvbfs_loadvnode(struct mount *mp, struct vnode *vp, 316 const void *key, size_t key_len, const void **new_key) 317 { 318 struct sysvbfs_mount *bmp; 319 struct bfs *bfs; 320 struct sysvbfs_node *bnode; 321 struct bfs_inode *inode; 322 uint16_t ino; 323 324 KASSERT(key_len == sizeof(ino)); 325 memcpy(&ino, key, key_len); 326 327 DPRINTF("%s: i-node=%u\n", __func__, ino); 328 329 bmp = mp->mnt_data; 330 bfs = bmp->bfs; 331 332 /* Lookup requested i-node */ 333 if (!bfs_inode_lookup(bfs, ino, &inode)) { 334 DPRINTF("%s: bfs_inode_lookup failed.\n", __func__); 335 return ENOENT; 336 } 337 338 bnode = pool_get(&sysvbfs_node_pool, PR_WAITOK); 339 memset(bnode, 0, sizeof(*bnode)); 340 341 vp->v_tag = VT_SYSVBFS; 342 vp->v_op = sysvbfs_vnodeop_p; 343 vp->v_data = bnode; 344 if (ino == BFS_ROOT_INODE) { /* BFS is flat filesystem */ 345 vp->v_type = VDIR; 346 vp->v_vflag |= VV_ROOT; 347 } else { 348 vp->v_type = VREG; 349 } 350 351 bnode->vnode = vp; 352 bnode->bmp = bmp; 353 bnode->inode = inode; 354 bnode->lockf = NULL; /* advlock */ 355 356 genfs_node_init(vp, &sysvbfs_genfsops); 357 uvm_vnp_setsize(vp, bfs_file_size(inode)); 358 359 *new_key = &bnode->inode->number; 360 361 return 0; 362 } 363 364 int 365 sysvbfs_vget(struct mount *mp, ino_t ino, int lktype, struct vnode **vpp) 366 { 367 int error; 368 uint16_t number; 369 struct vnode *vp; 370 371 KASSERT(ino <= UINT16_MAX); 372 number = ino; 373 374 DPRINTF("%s: i-node=%u\n", __func__, number); 375 376 error = vcache_get(mp, &number, sizeof(number), &vp); 377 if (error) 378 return error; 379 error = vn_lock(vp, lktype); 380 if (error) { 381 vrele(vp); 382 return error; 383 } 384 385 *vpp = vp; 386 387 return 0; 388 } 389 390 int 391 sysvbfs_fhtovp(struct mount *mp, struct fid *fid, int lktype, 392 struct vnode **vpp) 393 { 394 395 DPRINTF("%s:\n", __func__); 396 /* notyet */ 397 return EOPNOTSUPP; 398 } 399 400 int 401 sysvbfs_vptofh(struct vnode *vpp, struct fid *fid, size_t *fh_size) 402 { 403 404 DPRINTF("%s:\n", __func__); 405 /* notyet */ 406 return EOPNOTSUPP; 407 } 408 409 MALLOC_DECLARE(M_BFS); 410 MALLOC_DECLARE(M_SYSVBFS_VNODE); 411 412 void 413 sysvbfs_init(void) 414 { 415 416 DPRINTF("%s:\n", __func__); 417 malloc_type_attach(M_SYSVBFS_VFS); 418 malloc_type_attach(M_BFS); 419 malloc_type_attach(M_SYSVBFS_VNODE); 420 pool_init(&sysvbfs_node_pool, sizeof(struct sysvbfs_node), 0, 0, 0, 421 "sysvbfs_node_pool", &pool_allocator_nointr, IPL_NONE); 422 } 423 424 void 425 sysvbfs_reinit(void) 426 { 427 428 /* Nothing to do. */ 429 DPRINTF("%s:\n", __func__); 430 } 431 432 void 433 sysvbfs_done(void) 434 { 435 436 DPRINTF("%s:\n", __func__); 437 pool_destroy(&sysvbfs_node_pool); 438 malloc_type_detach(M_BFS); 439 malloc_type_detach(M_SYSVBFS_VFS); 440 malloc_type_detach(M_SYSVBFS_VNODE); 441 } 442 443 int 444 sysvbfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, 445 kauth_cred_t cred) 446 { 447 448 return 0; 449 } 450
Indexes created Tue Sep 23 07:09:52 GMT 2025