sysvbfs_vfsops.c revision 1.42
1 /* $NetBSD: sysvbfs_vfsops.c,v 1.42 2013/12/25 11:15:49 mlelstv 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 1.42 2013/12/25 11:15:49 mlelstv 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 = (struct sysvbfs_mount *)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 bmp = (struct sysvbfs_mount *)mp->mnt_data; 120 if (devvp != bmp->devvp) 121 error = EINVAL; 122 } 123 } 124 125 /* 126 * If mount by non-root, then verify that user has necessary 127 * permissions on the device. 128 * 129 * Permission to update a mount is checked higher, so here we presume 130 * updating the mount is okay (for example, as far as securelevel goes) 131 * which leaves us with the normal check. 132 */ 133 if (error == 0) { 134 int accessmode = VREAD; 135 if (update ? 136 (mp->mnt_iflag & IMNT_WANTRDWR) != 0 : 137 (mp->mnt_flag & MNT_RDONLY) == 0) 138 accessmode |= VWRITE; 139 140 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 141 KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, 142 KAUTH_ARG(accessmode)); 143 } 144 145 if (error) { 146 vrele(devvp); 147 return error; 148 } 149 150 if (!update) { 151 if ((error = sysvbfs_mountfs(devvp, mp, l)) != 0) { 152 vrele(devvp); 153 return error; 154 } 155 } else if (mp->mnt_flag & MNT_RDONLY) { 156 /* XXX: r/w -> read only */ 157 } 158 159 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 160 mp->mnt_op->vfs_name, mp, l); 161 } 162 163 int 164 sysvbfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l) 165 { 166 kauth_cred_t cred = l->l_cred; 167 struct sysvbfs_mount *bmp; 168 int error, oflags; 169 bool devopen = false; 170 171 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 172 error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0); 173 if (error) 174 goto out; 175 176 /* Open block device */ 177 oflags = FREAD; 178 if ((mp->mnt_flag & MNT_RDONLY) == 0) 179 oflags |= FWRITE; 180 if ((error = VOP_OPEN(devvp, oflags, NOCRED)) != 0) 181 goto out; 182 devopen = true; 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 goto out; 190 } 191 LIST_INIT(&bmp->bnode_head); 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 if (devopen && error) 204 VOP_CLOSE(devvp, oflags, NOCRED); 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, 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, &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 sysvbfs_mount *bmp = mp->mnt_data; 294 struct sysvbfs_node *bnode; 295 struct vnode *v; 296 int err, error; 297 298 DPRINTF("%s:\n", __func__); 299 error = 0; 300 mutex_enter(&mntvnode_lock); 301 for (bnode = LIST_FIRST(&bmp->bnode_head); bnode != NULL; 302 bnode = LIST_NEXT(bnode, link)) { 303 v = bnode->vnode; 304 mutex_enter(v->v_interlock); 305 mutex_exit(&mntvnode_lock); 306 err = vget(v, LK_EXCLUSIVE | LK_NOWAIT); 307 if (err == 0) { 308 err = VOP_FSYNC(v, cred, FSYNC_WAIT, 0, 0); 309 vput(v); 310 } 311 if (err != 0) 312 error = err; 313 mutex_enter(&mntvnode_lock); 314 } 315 mutex_exit(&mntvnode_lock); 316 317 return error; 318 } 319 320 int 321 sysvbfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 322 { 323 struct sysvbfs_mount *bmp = mp->mnt_data; 324 struct bfs *bfs = bmp->bfs; 325 struct vnode *vp; 326 struct sysvbfs_node *bnode; 327 struct bfs_inode *inode; 328 int error; 329 330 DPRINTF("%s: i-node=%lld\n", __func__, (long long)ino); 331 /* Lookup requested i-node */ 332 if (!bfs_inode_lookup(bfs, ino, &inode)) { 333 DPRINTF("%s: bfs_inode_lookup failed.\n", __func__); 334 return ENOENT; 335 } 336 337 retry: 338 mutex_enter(&mntvnode_lock); 339 for (bnode = LIST_FIRST(&bmp->bnode_head); bnode != NULL; 340 bnode = LIST_NEXT(bnode, link)) { 341 if (bnode->inode->number == ino) { 342 vp = bnode->vnode; 343 mutex_enter(vp->v_interlock); 344 mutex_exit(&mntvnode_lock); 345 if (vget(vp, LK_EXCLUSIVE) == 0) { 346 *vpp = vp; 347 return 0; 348 } else { 349 goto retry; 350 } 351 } 352 } 353 mutex_exit(&mntvnode_lock); 354 355 /* Allocate v-node. */ 356 error = getnewvnode(VT_SYSVBFS, mp, sysvbfs_vnodeop_p, NULL, &vp); 357 if (error) { 358 DPRINTF("%s: getnewvnode error.\n", __func__); 359 return error; 360 } 361 /* Lock vnode here */ 362 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 363 364 /* Allocate i-node */ 365 vp->v_data = pool_get(&sysvbfs_node_pool, PR_WAITOK); 366 memset(vp->v_data, 0, sizeof(struct sysvbfs_node)); 367 bnode = vp->v_data; 368 mutex_enter(&mntvnode_lock); 369 LIST_INSERT_HEAD(&bmp->bnode_head, bnode, link); 370 mutex_exit(&mntvnode_lock); 371 bnode->vnode = vp; 372 bnode->bmp = bmp; 373 bnode->inode = inode; 374 bnode->lockf = NULL; /* advlock */ 375 376 if (ino == BFS_ROOT_INODE) { /* BFS is flat filesystem */ 377 vp->v_type = VDIR; 378 vp->v_vflag |= VV_ROOT; 379 } else { 380 vp->v_type = VREG; 381 } 382 383 genfs_node_init(vp, &sysvbfs_genfsops); 384 uvm_vnp_setsize(vp, bfs_file_size(inode)); 385 *vpp = vp; 386 387 return 0; 388 } 389 390 int 391 sysvbfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp) 392 { 393 394 DPRINTF("%s:\n", __func__); 395 /* notyet */ 396 return EOPNOTSUPP; 397 } 398 399 int 400 sysvbfs_vptofh(struct vnode *vpp, struct fid *fid, size_t *fh_size) 401 { 402 403 DPRINTF("%s:\n", __func__); 404 /* notyet */ 405 return EOPNOTSUPP; 406 } 407 408 MALLOC_DECLARE(M_BFS); 409 MALLOC_DECLARE(M_SYSVBFS_VNODE); 410 411 void 412 sysvbfs_init(void) 413 { 414 415 DPRINTF("%s:\n", __func__); 416 malloc_type_attach(M_SYSVBFS_VFS); 417 malloc_type_attach(M_BFS); 418 malloc_type_attach(M_SYSVBFS_VNODE); 419 pool_init(&sysvbfs_node_pool, sizeof(struct sysvbfs_node), 0, 0, 0, 420 "sysvbfs_node_pool", &pool_allocator_nointr, IPL_NONE); 421 } 422 423 void 424 sysvbfs_reinit(void) 425 { 426 427 /* Nothing to do. */ 428 DPRINTF("%s:\n", __func__); 429 } 430 431 void 432 sysvbfs_done(void) 433 { 434 435 DPRINTF("%s:\n", __func__); 436 pool_destroy(&sysvbfs_node_pool); 437 malloc_type_detach(M_BFS); 438 malloc_type_detach(M_SYSVBFS_VFS); 439 malloc_type_detach(M_SYSVBFS_VNODE); 440 } 441 442 int 443 sysvbfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, 444 kauth_cred_t cred) 445 { 446 447 return 0; 448 } 449
Indexes created Wed Sep 24 05:09:52 GMT 2025