sysvbfs_vfsops.c revision 1.41.2.1
1 /* $NetBSD: sysvbfs_vfsops.c,v 1.41.2.1 2014/08/20 00:04:28 tls 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 1.41.2.1 2014/08/20 00:04:28 tls 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 bool devopen = false; 172 173 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 174 error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0); 175 if (error) 176 goto out; 177 178 /* Open block device */ 179 oflags = FREAD; 180 if ((mp->mnt_flag & MNT_RDONLY) == 0) 181 oflags |= FWRITE; 182 if ((error = VOP_OPEN(devvp, oflags, NOCRED)) != 0) 183 goto out; 184 devopen = true; 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 goto out; 192 } 193 LIST_INIT(&bmp->bnode_head); 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 if (devopen && error) 206 VOP_CLOSE(devvp, oflags, NOCRED); 207 VOP_UNLOCK(devvp); 208 return error; 209 } 210 211 int 212 sysvbfs_start(struct mount *mp, int flags) 213 { 214 215 DPRINTF("%s:\n", __func__); 216 /* Nothing to do. */ 217 return 0; 218 } 219 220 int 221 sysvbfs_unmount(struct mount *mp, int mntflags) 222 { 223 struct sysvbfs_mount *bmp = (void *)mp->mnt_data; 224 int error; 225 226 DPRINTF("%s: %p\n", __func__, bmp); 227 228 if ((error = vflush(mp, NULLVP, 229 mntflags & MNT_FORCE ? FORCECLOSE : 0)) != 0) 230 return error; 231 232 vn_lock(bmp->devvp, LK_EXCLUSIVE | LK_RETRY); 233 error = VOP_CLOSE(bmp->devvp, FREAD, NOCRED); 234 vput(bmp->devvp); 235 236 sysvbfs_bfs_fini(bmp->bfs); 237 238 free(bmp, M_SYSVBFS_VFS); 239 mp->mnt_data = NULL; 240 mp->mnt_flag &= ~MNT_LOCAL; 241 242 return 0; 243 } 244 245 int 246 sysvbfs_root(struct mount *mp, struct vnode **vpp) 247 { 248 struct vnode *vp; 249 int error; 250 251 DPRINTF("%s:\n", __func__); 252 if ((error = VFS_VGET(mp, BFS_ROOT_INODE, &vp)) != 0) 253 return error; 254 *vpp = vp; 255 256 return 0; 257 } 258 259 int 260 sysvbfs_statvfs(struct mount *mp, struct statvfs *f) 261 { 262 struct sysvbfs_mount *bmp = mp->mnt_data; 263 struct bfs *bfs = bmp->bfs; 264 int free_block; 265 size_t data_block; 266 267 data_block = (bfs->data_end - bfs->data_start) >> BFS_BSHIFT; 268 if (bfs_inode_alloc(bfs, 0, 0, &free_block) != 0) 269 free_block = 0; 270 else 271 free_block = (bfs->data_end >> BFS_BSHIFT) - free_block; 272 273 DPRINTF("%s: %d %d %d\n", __func__, bfs->data_start, 274 bfs->data_end, free_block); 275 276 f->f_bsize = BFS_BSIZE; 277 f->f_frsize = BFS_BSIZE; 278 f->f_iosize = BFS_BSIZE; 279 f->f_blocks = data_block; 280 f->f_bfree = free_block; 281 f->f_bavail = f->f_bfree; 282 f->f_bresvd = 0; 283 f->f_files = bfs->max_inode; 284 f->f_ffree = bfs->max_inode - bfs->n_inode; 285 f->f_favail = f->f_ffree; 286 f->f_fresvd = 0; 287 copy_statvfs_info(f, mp); 288 289 return 0; 290 } 291 292 int 293 sysvbfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 294 { 295 struct sysvbfs_mount *bmp = mp->mnt_data; 296 struct sysvbfs_node *bnode; 297 struct vnode *v; 298 int err, error; 299 300 DPRINTF("%s:\n", __func__); 301 error = 0; 302 mutex_enter(&mntvnode_lock); 303 for (bnode = LIST_FIRST(&bmp->bnode_head); bnode != NULL; 304 bnode = LIST_NEXT(bnode, link)) { 305 v = bnode->vnode; 306 mutex_enter(v->v_interlock); 307 mutex_exit(&mntvnode_lock); 308 err = vget(v, LK_EXCLUSIVE | LK_NOWAIT); 309 if (err == 0) { 310 err = VOP_FSYNC(v, cred, FSYNC_WAIT, 0, 0); 311 vput(v); 312 } 313 if (err != 0) 314 error = err; 315 mutex_enter(&mntvnode_lock); 316 } 317 mutex_exit(&mntvnode_lock); 318 319 return error; 320 } 321 322 int 323 sysvbfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 324 { 325 struct sysvbfs_mount *bmp = mp->mnt_data; 326 struct bfs *bfs = bmp->bfs; 327 struct vnode *vp; 328 struct sysvbfs_node *bnode; 329 struct bfs_inode *inode; 330 int error; 331 332 DPRINTF("%s: i-node=%lld\n", __func__, (long long)ino); 333 /* Lookup requested i-node */ 334 if (!bfs_inode_lookup(bfs, ino, &inode)) { 335 DPRINTF("%s: bfs_inode_lookup failed.\n", __func__); 336 return ENOENT; 337 } 338 339 retry: 340 mutex_enter(&mntvnode_lock); 341 for (bnode = LIST_FIRST(&bmp->bnode_head); bnode != NULL; 342 bnode = LIST_NEXT(bnode, link)) { 343 if (bnode->inode->number == ino) { 344 vp = bnode->vnode; 345 mutex_enter(vp->v_interlock); 346 mutex_exit(&mntvnode_lock); 347 if (vget(vp, LK_EXCLUSIVE) == 0) { 348 *vpp = vp; 349 return 0; 350 } else { 351 goto retry; 352 } 353 } 354 } 355 mutex_exit(&mntvnode_lock); 356 357 /* Allocate v-node. */ 358 error = getnewvnode(VT_SYSVBFS, mp, sysvbfs_vnodeop_p, NULL, &vp); 359 if (error) { 360 DPRINTF("%s: getnewvnode error.\n", __func__); 361 return error; 362 } 363 /* Lock vnode here */ 364 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 365 366 /* Allocate i-node */ 367 vp->v_data = pool_get(&sysvbfs_node_pool, PR_WAITOK); 368 memset(vp->v_data, 0, sizeof(struct sysvbfs_node)); 369 bnode = vp->v_data; 370 mutex_enter(&mntvnode_lock); 371 LIST_INSERT_HEAD(&bmp->bnode_head, bnode, link); 372 mutex_exit(&mntvnode_lock); 373 bnode->vnode = vp; 374 bnode->bmp = bmp; 375 bnode->inode = inode; 376 bnode->lockf = NULL; /* advlock */ 377 378 if (ino == BFS_ROOT_INODE) { /* BFS is flat filesystem */ 379 vp->v_type = VDIR; 380 vp->v_vflag |= VV_ROOT; 381 } else { 382 vp->v_type = VREG; 383 } 384 385 genfs_node_init(vp, &sysvbfs_genfsops); 386 uvm_vnp_setsize(vp, bfs_file_size(inode)); 387 *vpp = vp; 388 389 return 0; 390 } 391 392 int 393 sysvbfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp) 394 { 395 396 DPRINTF("%s:\n", __func__); 397 /* notyet */ 398 return EOPNOTSUPP; 399 } 400 401 int 402 sysvbfs_vptofh(struct vnode *vpp, struct fid *fid, size_t *fh_size) 403 { 404 405 DPRINTF("%s:\n", __func__); 406 /* notyet */ 407 return EOPNOTSUPP; 408 } 409 410 MALLOC_DECLARE(M_BFS); 411 MALLOC_DECLARE(M_SYSVBFS_VNODE); 412 413 void 414 sysvbfs_init(void) 415 { 416 417 DPRINTF("%s:\n", __func__); 418 malloc_type_attach(M_SYSVBFS_VFS); 419 malloc_type_attach(M_BFS); 420 malloc_type_attach(M_SYSVBFS_VNODE); 421 pool_init(&sysvbfs_node_pool, sizeof(struct sysvbfs_node), 0, 0, 0, 422 "sysvbfs_node_pool", &pool_allocator_nointr, IPL_NONE); 423 } 424 425 void 426 sysvbfs_reinit(void) 427 { 428 429 /* Nothing to do. */ 430 DPRINTF("%s:\n", __func__); 431 } 432 433 void 434 sysvbfs_done(void) 435 { 436 437 DPRINTF("%s:\n", __func__); 438 pool_destroy(&sysvbfs_node_pool); 439 malloc_type_detach(M_BFS); 440 malloc_type_detach(M_SYSVBFS_VFS); 441 malloc_type_detach(M_SYSVBFS_VNODE); 442 } 443 444 int 445 sysvbfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, 446 kauth_cred_t cred) 447 { 448 449 return 0; 450 } 451
Indexes created Tue Sep 23 21:09:50 GMT 2025