sysvbfs_vfsops.c revision 1.23
1 /* $NetBSD: sysvbfs_vfsops.c,v 1.23 2008/04/28 20:24:02 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 1.23 2008/04/28 20:24:02 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/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 nameidata nd; 74 struct sysvbfs_args *args = data; 75 struct sysvbfs_mount *bmp = NULL; 76 struct vnode *devvp = NULL; 77 int error; 78 bool update; 79 80 DPRINTF("%s: mnt_flag=%x\n", __func__, mp->mnt_flag); 81 82 if (*data_len < sizeof *args) 83 return EINVAL; 84 85 if (mp->mnt_flag & MNT_GETARGS) { 86 if ((bmp = (void *)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 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, args->fspec); 104 if ((error = namei(&nd)) != 0) 105 return (error); 106 devvp = nd.ni_vp; 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 if (devvp != bmp->devvp) 122 error = EINVAL; 123 } 124 } 125 126 /* 127 * If mount by non-root, then verify that user has necessary 128 * permissions on the device. 129 */ 130 if (error == 0 && kauth_authorize_generic(l->l_cred, 131 KAUTH_GENERIC_ISSUSER, NULL)) { 132 int accessmode = VREAD; 133 if (update ? 134 (mp->mnt_iflag & IMNT_WANTRDWR) != 0 : 135 (mp->mnt_flag & MNT_RDONLY) == 0) 136 accessmode |= VWRITE; 137 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 138 error = VOP_ACCESS(devvp, accessmode, l->l_cred); 139 VOP_UNLOCK(devvp, 0); 140 } 141 142 if (error) { 143 vrele(devvp); 144 return error; 145 } 146 147 if (!update) { 148 if ((error = sysvbfs_mountfs(devvp, mp, l)) != 0) { 149 vrele(devvp); 150 return error; 151 } 152 } else if (mp->mnt_flag & MNT_RDONLY) { 153 /* XXX: r/w -> read only */ 154 } 155 156 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 157 mp->mnt_op->vfs_name, mp, l); 158 } 159 160 int 161 sysvbfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l) 162 { 163 kauth_cred_t cred = l->l_cred; 164 struct sysvbfs_mount *bmp; 165 struct partinfo dpart; 166 int error; 167 168 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 169 error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0); 170 VOP_UNLOCK(devvp, 0); 171 if (error) 172 return error; 173 174 /* Open block device */ 175 if ((error = VOP_OPEN(devvp, FREAD, NOCRED)) != 0) 176 return error; 177 178 /* Get partition information */ 179 if ((error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, cred)) != 0) 180 return error; 181 182 bmp = malloc(sizeof(struct sysvbfs_mount), M_SYSVBFS_VFS, M_WAITOK); 183 if (bmp == NULL) 184 return ENOMEM; 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 return error; 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_flag |= MNT_LOCAL; 198 mp->mnt_dev_bshift = BFS_BSHIFT; 199 mp->mnt_fs_bshift = BFS_BSHIFT; 200 201 DPRINTF("fstype=%d dtype=%d bsize=%d\n", dpart.part->p_fstype, 202 dpart.disklab->d_type, dpart.disklab->d_secsize); 203 204 return 0; 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, 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, &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->n_inode; 280 f->f_ffree = bfs->max_inode - f->f_files; 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 sysvbfs_mount *bmp = mp->mnt_data; 292 struct sysvbfs_node *bnode; 293 struct vnode *v; 294 int err, error; 295 296 DPRINTF("%s:\n", __func__); 297 error = 0; 298 mutex_enter(&mntvnode_lock); 299 for (bnode = LIST_FIRST(&bmp->bnode_head); bnode != NULL; 300 bnode = LIST_NEXT(bnode, link)) { 301 v = bnode->vnode; 302 mutex_enter(&v->v_interlock); 303 mutex_exit(&mntvnode_lock); 304 err = vget(v, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 305 if (err == 0) { 306 err = VOP_FSYNC(v, cred, FSYNC_WAIT, 0, 0); 307 vput(v); 308 } 309 if (err != 0) 310 error = err; 311 mutex_enter(&mntvnode_lock); 312 } 313 mutex_exit(&mntvnode_lock); 314 315 return error; 316 } 317 318 int 319 sysvbfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 320 { 321 struct sysvbfs_mount *bmp = mp->mnt_data; 322 struct bfs *bfs = bmp->bfs; 323 struct vnode *vp; 324 struct sysvbfs_node *bnode; 325 struct bfs_inode *inode; 326 int error; 327 328 DPRINTF("%s: i-node=%d\n", __func__, ino); 329 /* Lookup requested i-node */ 330 if (!bfs_inode_lookup(bfs, ino, &inode)) { 331 DPRINTF("bfs_inode_lookup failed.\n"); 332 return ENOENT; 333 } 334 for (bnode = LIST_FIRST(&bmp->bnode_head); bnode != NULL; 335 bnode = LIST_NEXT(bnode, link)) { 336 if (bnode->inode->number == ino) { 337 *vpp = bnode->vnode; 338 } 339 } 340 341 /* Allocate v-node. */ 342 if ((error = getnewvnode(VT_SYSVBFS, mp, sysvbfs_vnodeop_p, &vp)) != 343 0) { 344 DPRINTF("%s: getnewvnode error.\n", __func__); 345 return error; 346 } 347 /* Lock vnode here */ 348 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 349 350 /* Allocate i-node */ 351 vp->v_data = pool_get(&sysvbfs_node_pool, PR_WAITOK); 352 memset(vp->v_data, 0, sizeof(struct sysvbfs_node)); 353 bnode = vp->v_data; 354 mutex_enter(&mntvnode_lock); 355 LIST_INSERT_HEAD(&bmp->bnode_head, bnode, link); 356 mutex_exit(&mntvnode_lock); 357 bnode->vnode = vp; 358 bnode->bmp = bmp; 359 bnode->inode = inode; 360 bnode->lockf = NULL; /* advlock */ 361 362 if (ino == BFS_ROOT_INODE) { /* BFS is flat filesystem */ 363 vp->v_type = VDIR; 364 vp->v_vflag |= VV_ROOT; 365 } else { 366 vp->v_type = VREG; 367 } 368 369 genfs_node_init(vp, &sysvbfs_genfsops); 370 uvm_vnp_setsize(vp, bfs_file_size(inode)); 371 *vpp = vp; 372 373 return 0; 374 } 375 376 int 377 sysvbfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp) 378 { 379 380 DPRINTF("%s:\n", __func__); 381 /* notyet */ 382 return EOPNOTSUPP; 383 } 384 385 int 386 sysvbfs_vptofh(struct vnode *vpp, struct fid *fid, size_t *fh_size) 387 { 388 389 DPRINTF("%s:\n", __func__); 390 /* notyet */ 391 return EOPNOTSUPP; 392 } 393 394 MALLOC_DECLARE(M_BFS); 395 MALLOC_DECLARE(M_SYSVBFS_VNODE); 396 397 void 398 sysvbfs_init(void) 399 { 400 401 DPRINTF("%s:\n", __func__); 402 malloc_type_attach(M_SYSVBFS_VFS); 403 malloc_type_attach(M_BFS); 404 malloc_type_attach(M_SYSVBFS_VNODE); 405 pool_init(&sysvbfs_node_pool, sizeof(struct sysvbfs_node), 0, 0, 0, 406 "sysvbfs_node_pool", &pool_allocator_nointr, IPL_NONE); 407 } 408 409 void 410 sysvbfs_reinit(void) 411 { 412 413 /* Nothing to do. */ 414 DPRINTF("%s:\n", __func__); 415 } 416 417 void 418 sysvbfs_done(void) 419 { 420 421 DPRINTF("%s:\n", __func__); 422 pool_destroy(&sysvbfs_node_pool); 423 malloc_type_detach(M_BFS); 424 malloc_type_detach(M_SYSVBFS_VFS); 425 malloc_type_detach(M_SYSVBFS_VNODE); 426 } 427 428 int 429 sysvbfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, 430 kauth_cred_t cred) 431 { 432 433 return 0; 434 } 435
Indexes created Tue Sep 23 02:09:52 GMT 2025