sysvbfs_vfsops.c revision 1.30
1 /* $NetBSD: sysvbfs_vfsops.c,v 1.30 2009/06/29 05:08:17 dholland 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 1.30 2009/06/29 05:08:17 dholland 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/disklabel.h> 43 #include <sys/fcntl.h> 44 #include <sys/malloc.h> 45 #include <sys/kauth.h> 46 #include <sys/proc.h> 47 48 /* v-node */ 49 #include <sys/namei.h> 50 #include <sys/vnode.h> 51 /* devsw */ 52 #include <sys/conf.h> 53 54 #include <fs/sysvbfs/sysvbfs.h> /* external interface */ 55 #include <fs/sysvbfs/bfs.h> /* internal interface */ 56 57 #ifdef SYSVBFS_VNOPS_DEBUG 58 #define DPRINTF(fmt, args...) printf(fmt, ##args) 59 #else 60 #define DPRINTF(arg...) ((void)0) 61 #endif 62 63 MALLOC_JUSTDEFINE(M_SYSVBFS_VFS, "sysvbfs vfs", "sysvbfs vfs structures"); 64 65 struct pool sysvbfs_node_pool; 66 67 int sysvbfs_mountfs(struct vnode *, struct mount *, struct lwp *); 68 69 int 70 sysvbfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 71 { 72 struct lwp *l = curlwp; 73 struct sysvbfs_args *args = data; 74 struct sysvbfs_mount *bmp = NULL; 75 struct vnode *devvp = NULL; 76 int error; 77 bool update; 78 79 DPRINTF("%s: mnt_flag=%x\n", __func__, mp->mnt_flag); 80 81 if (*data_len < sizeof *args) 82 return EINVAL; 83 84 if (mp->mnt_flag & MNT_GETARGS) { 85 if ((bmp = (void *)mp->mnt_data) == NULL) 86 return EIO; 87 args->fspec = NULL; 88 *data_len = sizeof *args; 89 return 0; 90 } 91 92 93 DPRINTF("%s: args->fspec=%s\n", __func__, args->fspec); 94 update = mp->mnt_flag & MNT_UPDATE; 95 if (args->fspec == NULL) { 96 /* nothing to do. */ 97 return EINVAL; 98 } 99 100 if (args->fspec != NULL) { 101 /* Look up the name and verify that it's sane. */ 102 error = namei_simple_user(args->fspec, 103 NSM_FOLLOW_NOEMULROOT, &devvp); 104 if (error != 0) 105 return (error); 106 107 if (!update) { 108 /* 109 * Be sure this is a valid block device 110 */ 111 if (devvp->v_type != VBLK) 112 error = ENOTBLK; 113 else if (bdevsw_lookup(devvp->v_rdev) == NULL) 114 error = ENXIO; 115 } else { 116 /* 117 * Be sure we're still naming the same device 118 * used for our initial mount 119 */ 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 = genfs_can_mount(devvp, accessmode, l->l_cred); 141 } 142 143 if (error) { 144 vrele(devvp); 145 return error; 146 } 147 148 if (!update) { 149 if ((error = sysvbfs_mountfs(devvp, mp, l)) != 0) { 150 vrele(devvp); 151 return error; 152 } 153 } else if (mp->mnt_flag & MNT_RDONLY) { 154 /* XXX: r/w -> read only */ 155 } 156 157 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 158 mp->mnt_op->vfs_name, mp, l); 159 } 160 161 int 162 sysvbfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l) 163 { 164 kauth_cred_t cred = l->l_cred; 165 struct sysvbfs_mount *bmp; 166 struct partinfo dpart; 167 int error, oflags; 168 169 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 170 error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0); 171 VOP_UNLOCK(devvp, 0); 172 if (error) 173 return error; 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 return error; 181 182 /* Get partition information */ 183 if ((error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, cred)) != 0) { 184 VOP_CLOSE(devvp, oflags, NOCRED); 185 return error; 186 } 187 188 bmp = malloc(sizeof(struct sysvbfs_mount), M_SYSVBFS_VFS, M_WAITOK); 189 if (bmp == NULL) { 190 VOP_CLOSE(devvp, oflags, NOCRED); 191 return ENOMEM; 192 } 193 bmp->devvp = devvp; 194 bmp->mountp = mp; 195 if ((error = sysvbfs_bfs_init(&bmp->bfs, devvp)) != 0) { 196 VOP_CLOSE(devvp, oflags, NOCRED); 197 free(bmp, M_SYSVBFS_VFS); 198 return error; 199 } 200 LIST_INIT(&bmp->bnode_head); 201 202 mp->mnt_data = bmp; 203 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)devvp->v_rdev; 204 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_SYSVBFS); 205 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 206 mp->mnt_flag |= MNT_LOCAL; 207 mp->mnt_dev_bshift = BFS_BSHIFT; 208 mp->mnt_fs_bshift = BFS_BSHIFT; 209 210 DPRINTF("fstype=%d dtype=%d bsize=%d\n", dpart.part->p_fstype, 211 dpart.disklab->d_type, dpart.disklab->d_secsize); 212 213 return 0; 214 } 215 216 int 217 sysvbfs_start(struct mount *mp, int flags) 218 { 219 220 DPRINTF("%s:\n", __func__); 221 /* Nothing to do. */ 222 return 0; 223 } 224 225 int 226 sysvbfs_unmount(struct mount *mp, int mntflags) 227 { 228 struct sysvbfs_mount *bmp = (void *)mp->mnt_data; 229 int error; 230 231 DPRINTF("%s: %p\n", __func__, bmp); 232 233 if ((error = vflush(mp, NULLVP, 234 mntflags & MNT_FORCE ? FORCECLOSE : 0)) != 0) 235 return error; 236 237 vn_lock(bmp->devvp, LK_EXCLUSIVE | LK_RETRY); 238 error = VOP_CLOSE(bmp->devvp, FREAD, NOCRED); 239 vput(bmp->devvp); 240 241 sysvbfs_bfs_fini(bmp->bfs); 242 243 free(bmp, M_SYSVBFS_VFS); 244 mp->mnt_data = NULL; 245 mp->mnt_flag &= ~MNT_LOCAL; 246 247 return 0; 248 } 249 250 int 251 sysvbfs_root(struct mount *mp, struct vnode **vpp) 252 { 253 struct vnode *vp; 254 int error; 255 256 DPRINTF("%s:\n", __func__); 257 if ((error = VFS_VGET(mp, BFS_ROOT_INODE, &vp)) != 0) 258 return error; 259 *vpp = vp; 260 261 return 0; 262 } 263 264 int 265 sysvbfs_statvfs(struct mount *mp, struct statvfs *f) 266 { 267 struct sysvbfs_mount *bmp = mp->mnt_data; 268 struct bfs *bfs = bmp->bfs; 269 int free_block; 270 size_t data_block; 271 272 data_block = (bfs->data_end - bfs->data_start) >> BFS_BSHIFT; 273 if (bfs_inode_alloc(bfs, 0, 0, &free_block) != 0) 274 free_block = 0; 275 else 276 free_block = (bfs->data_end >> BFS_BSHIFT) - free_block; 277 278 DPRINTF("%s: %d %d %d\n", __func__, bfs->data_start, 279 bfs->data_end, free_block); 280 281 f->f_bsize = BFS_BSIZE; 282 f->f_frsize = BFS_BSIZE; 283 f->f_iosize = BFS_BSIZE; 284 f->f_blocks = data_block; 285 f->f_bfree = free_block; 286 f->f_bavail = f->f_bfree; 287 f->f_bresvd = 0; 288 f->f_files = bfs->n_inode; 289 f->f_ffree = bfs->max_inode - f->f_files; 290 f->f_favail = f->f_ffree; 291 f->f_fresvd = 0; 292 copy_statvfs_info(f, mp); 293 294 return 0; 295 } 296 297 int 298 sysvbfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 299 { 300 struct sysvbfs_mount *bmp = mp->mnt_data; 301 struct sysvbfs_node *bnode; 302 struct vnode *v; 303 int err, error; 304 305 DPRINTF("%s:\n", __func__); 306 error = 0; 307 mutex_enter(&mntvnode_lock); 308 for (bnode = LIST_FIRST(&bmp->bnode_head); bnode != NULL; 309 bnode = LIST_NEXT(bnode, link)) { 310 v = bnode->vnode; 311 mutex_enter(&v->v_interlock); 312 mutex_exit(&mntvnode_lock); 313 err = vget(v, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 314 if (err == 0) { 315 err = VOP_FSYNC(v, cred, FSYNC_WAIT, 0, 0); 316 vput(v); 317 } 318 if (err != 0) 319 error = err; 320 mutex_enter(&mntvnode_lock); 321 } 322 mutex_exit(&mntvnode_lock); 323 324 return error; 325 } 326 327 int 328 sysvbfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 329 { 330 struct sysvbfs_mount *bmp = mp->mnt_data; 331 struct bfs *bfs = bmp->bfs; 332 struct vnode *vp; 333 struct sysvbfs_node *bnode; 334 struct bfs_inode *inode; 335 int error; 336 337 DPRINTF("%s: i-node=%lld\n", __func__, (long long)ino); 338 /* Lookup requested i-node */ 339 if (!bfs_inode_lookup(bfs, ino, &inode)) { 340 DPRINTF("bfs_inode_lookup failed.\n"); 341 return ENOENT; 342 } 343 344 retry: 345 mutex_enter(&mntvnode_lock); 346 for (bnode = LIST_FIRST(&bmp->bnode_head); bnode != NULL; 347 bnode = LIST_NEXT(bnode, link)) { 348 if (bnode->inode->number == ino) { 349 vp = bnode->vnode; 350 mutex_enter(&vp->v_interlock); 351 mutex_exit(&mntvnode_lock); 352 if (vget(vp, LK_EXCLUSIVE|LK_RETRY|LK_INTERLOCK) == 0) { 353 *vpp = vp; 354 return 0; 355 } else { 356 goto retry; 357 } 358 } 359 } 360 mutex_exit(&mntvnode_lock); 361 362 /* Allocate v-node. */ 363 if ((error = getnewvnode(VT_SYSVBFS, mp, sysvbfs_vnodeop_p, &vp)) != 364 0) { 365 DPRINTF("%s: getnewvnode error.\n", __func__); 366 return error; 367 } 368 /* Lock vnode here */ 369 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 370 371 /* Allocate i-node */ 372 vp->v_data = pool_get(&sysvbfs_node_pool, PR_WAITOK); 373 memset(vp->v_data, 0, sizeof(struct sysvbfs_node)); 374 bnode = vp->v_data; 375 mutex_enter(&mntvnode_lock); 376 LIST_INSERT_HEAD(&bmp->bnode_head, bnode, link); 377 mutex_exit(&mntvnode_lock); 378 bnode->vnode = vp; 379 bnode->bmp = bmp; 380 bnode->inode = inode; 381 bnode->lockf = NULL; /* advlock */ 382 383 if (ino == BFS_ROOT_INODE) { /* BFS is flat filesystem */ 384 vp->v_type = VDIR; 385 vp->v_vflag |= VV_ROOT; 386 } else { 387 vp->v_type = VREG; 388 } 389 390 genfs_node_init(vp, &sysvbfs_genfsops); 391 uvm_vnp_setsize(vp, bfs_file_size(inode)); 392 *vpp = vp; 393 394 return 0; 395 } 396 397 int 398 sysvbfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp) 399 { 400 401 DPRINTF("%s:\n", __func__); 402 /* notyet */ 403 return EOPNOTSUPP; 404 } 405 406 int 407 sysvbfs_vptofh(struct vnode *vpp, struct fid *fid, size_t *fh_size) 408 { 409 410 DPRINTF("%s:\n", __func__); 411 /* notyet */ 412 return EOPNOTSUPP; 413 } 414 415 MALLOC_DECLARE(M_BFS); 416 MALLOC_DECLARE(M_SYSVBFS_VNODE); 417 418 void 419 sysvbfs_init(void) 420 { 421 422 DPRINTF("%s:\n", __func__); 423 malloc_type_attach(M_SYSVBFS_VFS); 424 malloc_type_attach(M_BFS); 425 malloc_type_attach(M_SYSVBFS_VNODE); 426 pool_init(&sysvbfs_node_pool, sizeof(struct sysvbfs_node), 0, 0, 0, 427 "sysvbfs_node_pool", &pool_allocator_nointr, IPL_NONE); 428 } 429 430 void 431 sysvbfs_reinit(void) 432 { 433 434 /* Nothing to do. */ 435 DPRINTF("%s:\n", __func__); 436 } 437 438 void 439 sysvbfs_done(void) 440 { 441 442 DPRINTF("%s:\n", __func__); 443 pool_destroy(&sysvbfs_node_pool); 444 malloc_type_detach(M_BFS); 445 malloc_type_detach(M_SYSVBFS_VFS); 446 malloc_type_detach(M_SYSVBFS_VNODE); 447 } 448 449 int 450 sysvbfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, 451 kauth_cred_t cred) 452 { 453 454 return 0; 455 } 456
Indexes created Tue Sep 23 02:09:52 GMT 2025