sysvbfs_vfsops.c revision 1.40
1 /* $NetBSD: sysvbfs_vfsops.c,v 1.40 2012/06/13 22:56:50 joerg 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 1.40 2012/06/13 22:56:50 joerg 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 (*data_len < sizeof *args) 81 return EINVAL; 82 83 if (mp->mnt_flag & MNT_GETARGS) { 84 if ((bmp = (void *)mp->mnt_data) == NULL) 85 return EIO; 86 args->fspec = NULL; 87 *data_len = sizeof *args; 88 return 0; 89 } 90 91 92 DPRINTF("%s: args->fspec=%s\n", __func__, args->fspec); 93 update = mp->mnt_flag & MNT_UPDATE; 94 if (args->fspec == NULL) { 95 /* nothing to do. */ 96 return EINVAL; 97 } 98 99 if (args->fspec != NULL) { 100 /* Look up the name and verify that it's sane. */ 101 error = namei_simple_user(args->fspec, 102 NSM_FOLLOW_NOEMULROOT, &devvp); 103 if (error != 0) 104 return (error); 105 106 if (!update) { 107 /* 108 * Be sure this is a valid block device 109 */ 110 if (devvp->v_type != VBLK) 111 error = ENOTBLK; 112 else if (bdevsw_lookup(devvp->v_rdev) == NULL) 113 error = ENXIO; 114 } else { 115 /* 116 * Be sure we're still naming the same device 117 * used for our initial mount 118 */ 119 if (devvp != bmp->devvp) 120 error = EINVAL; 121 } 122 } 123 124 /* 125 * If mount by non-root, then verify that user has necessary 126 * permissions on the device. 127 * 128 * Permission to update a mount is checked higher, so here we presume 129 * updating the mount is okay (for example, as far as securelevel goes) 130 * which leaves us with the normal check. 131 */ 132 if (error == 0) { 133 int accessmode = VREAD; 134 if (update ? 135 (mp->mnt_iflag & IMNT_WANTRDWR) != 0 : 136 (mp->mnt_flag & MNT_RDONLY) == 0) 137 accessmode |= VWRITE; 138 139 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 140 KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, 141 KAUTH_ARG(accessmode)); 142 } 143 144 if (error) { 145 vrele(devvp); 146 return error; 147 } 148 149 if (!update) { 150 if ((error = sysvbfs_mountfs(devvp, mp, l)) != 0) { 151 vrele(devvp); 152 return error; 153 } 154 } else if (mp->mnt_flag & MNT_RDONLY) { 155 /* XXX: r/w -> read only */ 156 } 157 158 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 159 mp->mnt_op->vfs_name, mp, l); 160 } 161 162 int 163 sysvbfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l) 164 { 165 kauth_cred_t cred = l->l_cred; 166 struct sysvbfs_mount *bmp; 167 int error, oflags; 168 bool devopen = false; 169 170 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 171 error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0); 172 if (error) 173 goto out; 174 175 /* Open block device */ 176 oflags = FREAD; 177 if ((mp->mnt_flag & MNT_RDONLY) == 0) 178 oflags |= FWRITE; 179 if ((error = VOP_OPEN(devvp, oflags, NOCRED)) != 0) 180 goto out; 181 devopen = true; 182 183 bmp = malloc(sizeof(*bmp), M_SYSVBFS_VFS, M_WAITOK | M_ZERO); 184 bmp->devvp = devvp; 185 bmp->mountp = mp; 186 if ((error = sysvbfs_bfs_init(&bmp->bfs, devvp)) != 0) { 187 free(bmp, M_SYSVBFS_VFS); 188 goto out; 189 } 190 LIST_INIT(&bmp->bnode_head); 191 192 mp->mnt_data = bmp; 193 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)devvp->v_rdev; 194 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_SYSVBFS); 195 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 196 mp->mnt_stat.f_namemax = BFS_FILENAME_MAXLEN; 197 mp->mnt_flag |= MNT_LOCAL; 198 mp->mnt_dev_bshift = BFS_BSHIFT; 199 mp->mnt_fs_bshift = BFS_BSHIFT; 200 201 out: 202 if (devopen && error) 203 VOP_CLOSE(devvp, oflags, NOCRED); 204 VOP_UNLOCK(devvp); 205 return error; 206 } 207 208 int 209 sysvbfs_start(struct mount *mp, int flags) 210 { 211 212 DPRINTF("%s:\n", __func__); 213 /* Nothing to do. */ 214 return 0; 215 } 216 217 int 218 sysvbfs_unmount(struct mount *mp, int mntflags) 219 { 220 struct sysvbfs_mount *bmp = (void *)mp->mnt_data; 221 int error; 222 223 DPRINTF("%s: %p\n", __func__, bmp); 224 225 if ((error = vflush(mp, NULLVP, 226 mntflags & MNT_FORCE ? FORCECLOSE : 0)) != 0) 227 return error; 228 229 vn_lock(bmp->devvp, LK_EXCLUSIVE | LK_RETRY); 230 error = VOP_CLOSE(bmp->devvp, FREAD, NOCRED); 231 vput(bmp->devvp); 232 233 sysvbfs_bfs_fini(bmp->bfs); 234 235 free(bmp, M_SYSVBFS_VFS); 236 mp->mnt_data = NULL; 237 mp->mnt_flag &= ~MNT_LOCAL; 238 239 return 0; 240 } 241 242 int 243 sysvbfs_root(struct mount *mp, struct vnode **vpp) 244 { 245 struct vnode *vp; 246 int error; 247 248 DPRINTF("%s:\n", __func__); 249 if ((error = VFS_VGET(mp, BFS_ROOT_INODE, &vp)) != 0) 250 return error; 251 *vpp = vp; 252 253 return 0; 254 } 255 256 int 257 sysvbfs_statvfs(struct mount *mp, struct statvfs *f) 258 { 259 struct sysvbfs_mount *bmp = mp->mnt_data; 260 struct bfs *bfs = bmp->bfs; 261 int free_block; 262 size_t data_block; 263 264 data_block = (bfs->data_end - bfs->data_start) >> BFS_BSHIFT; 265 if (bfs_inode_alloc(bfs, 0, 0, &free_block) != 0) 266 free_block = 0; 267 else 268 free_block = (bfs->data_end >> BFS_BSHIFT) - free_block; 269 270 DPRINTF("%s: %d %d %d\n", __func__, bfs->data_start, 271 bfs->data_end, free_block); 272 273 f->f_bsize = BFS_BSIZE; 274 f->f_frsize = BFS_BSIZE; 275 f->f_iosize = BFS_BSIZE; 276 f->f_blocks = data_block; 277 f->f_bfree = free_block; 278 f->f_bavail = f->f_bfree; 279 f->f_bresvd = 0; 280 f->f_files = bfs->n_inode; 281 f->f_ffree = bfs->max_inode - f->f_files; 282 f->f_favail = f->f_ffree; 283 f->f_fresvd = 0; 284 copy_statvfs_info(f, mp); 285 286 return 0; 287 } 288 289 int 290 sysvbfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 291 { 292 struct sysvbfs_mount *bmp = mp->mnt_data; 293 struct sysvbfs_node *bnode; 294 struct vnode *v; 295 int err, error; 296 297 DPRINTF("%s:\n", __func__); 298 error = 0; 299 mutex_enter(&mntvnode_lock); 300 for (bnode = LIST_FIRST(&bmp->bnode_head); bnode != NULL; 301 bnode = LIST_NEXT(bnode, link)) { 302 v = bnode->vnode; 303 mutex_enter(v->v_interlock); 304 mutex_exit(&mntvnode_lock); 305 err = vget(v, LK_EXCLUSIVE | LK_NOWAIT); 306 if (err == 0) { 307 err = VOP_FSYNC(v, cred, FSYNC_WAIT, 0, 0); 308 vput(v); 309 } 310 if (err != 0) 311 error = err; 312 mutex_enter(&mntvnode_lock); 313 } 314 mutex_exit(&mntvnode_lock); 315 316 return error; 317 } 318 319 int 320 sysvbfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 321 { 322 struct sysvbfs_mount *bmp = mp->mnt_data; 323 struct bfs *bfs = bmp->bfs; 324 struct vnode *vp; 325 struct sysvbfs_node *bnode; 326 struct bfs_inode *inode; 327 int error; 328 329 DPRINTF("%s: i-node=%lld\n", __func__, (long long)ino); 330 /* Lookup requested i-node */ 331 if (!bfs_inode_lookup(bfs, ino, &inode)) { 332 DPRINTF("%s: bfs_inode_lookup failed.\n", __func__); 333 return ENOENT; 334 } 335 336 retry: 337 mutex_enter(&mntvnode_lock); 338 for (bnode = LIST_FIRST(&bmp->bnode_head); bnode != NULL; 339 bnode = LIST_NEXT(bnode, link)) { 340 if (bnode->inode->number == ino) { 341 vp = bnode->vnode; 342 mutex_enter(vp->v_interlock); 343 mutex_exit(&mntvnode_lock); 344 if (vget(vp, LK_EXCLUSIVE) == 0) { 345 *vpp = vp; 346 return 0; 347 } else { 348 goto retry; 349 } 350 } 351 } 352 mutex_exit(&mntvnode_lock); 353 354 /* Allocate v-node. */ 355 error = getnewvnode(VT_SYSVBFS, mp, sysvbfs_vnodeop_p, NULL, &vp); 356 if (error) { 357 DPRINTF("%s: getnewvnode error.\n", __func__); 358 return error; 359 } 360 /* Lock vnode here */ 361 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 362 363 /* Allocate i-node */ 364 vp->v_data = pool_get(&sysvbfs_node_pool, PR_WAITOK); 365 memset(vp->v_data, 0, sizeof(struct sysvbfs_node)); 366 bnode = vp->v_data; 367 mutex_enter(&mntvnode_lock); 368 LIST_INSERT_HEAD(&bmp->bnode_head, bnode, link); 369 mutex_exit(&mntvnode_lock); 370 bnode->vnode = vp; 371 bnode->bmp = bmp; 372 bnode->inode = inode; 373 bnode->lockf = NULL; /* advlock */ 374 375 if (ino == BFS_ROOT_INODE) { /* BFS is flat filesystem */ 376 vp->v_type = VDIR; 377 vp->v_vflag |= VV_ROOT; 378 } else { 379 vp->v_type = VREG; 380 } 381 382 genfs_node_init(vp, &sysvbfs_genfsops); 383 uvm_vnp_setsize(vp, bfs_file_size(inode)); 384 *vpp = vp; 385 386 return 0; 387 } 388 389 int 390 sysvbfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp) 391 { 392 393 DPRINTF("%s:\n", __func__); 394 /* notyet */ 395 return EOPNOTSUPP; 396 } 397 398 int 399 sysvbfs_vptofh(struct vnode *vpp, struct fid *fid, size_t *fh_size) 400 { 401 402 DPRINTF("%s:\n", __func__); 403 /* notyet */ 404 return EOPNOTSUPP; 405 } 406 407 MALLOC_DECLARE(M_BFS); 408 MALLOC_DECLARE(M_SYSVBFS_VNODE); 409 410 void 411 sysvbfs_init(void) 412 { 413 414 DPRINTF("%s:\n", __func__); 415 malloc_type_attach(M_SYSVBFS_VFS); 416 malloc_type_attach(M_BFS); 417 malloc_type_attach(M_SYSVBFS_VNODE); 418 pool_init(&sysvbfs_node_pool, sizeof(struct sysvbfs_node), 0, 0, 0, 419 "sysvbfs_node_pool", &pool_allocator_nointr, IPL_NONE); 420 } 421 422 void 423 sysvbfs_reinit(void) 424 { 425 426 /* Nothing to do. */ 427 DPRINTF("%s:\n", __func__); 428 } 429 430 void 431 sysvbfs_done(void) 432 { 433 434 DPRINTF("%s:\n", __func__); 435 pool_destroy(&sysvbfs_node_pool); 436 malloc_type_detach(M_BFS); 437 malloc_type_detach(M_SYSVBFS_VFS); 438 malloc_type_detach(M_SYSVBFS_VNODE); 439 } 440 441 int 442 sysvbfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, 443 kauth_cred_t cred) 444 { 445 446 return 0; 447 } 448
Indexes created Mon Sep 22 13:09:51 GMT 2025