sysvbfs_vfsops.c revision 1.31.2.1
1 /* $NetBSD: sysvbfs_vfsops.c,v 1.31.2.1 2010/08/17 06:47:21 uebayasi 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 1.31.2.1 2010/08/17 06:47:21 uebayasi 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 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 /* Get partition information */ 184 if ((error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, cred)) != 0) { 185 goto out; 186 } 187 188 bmp = malloc(sizeof(struct sysvbfs_mount), M_SYSVBFS_VFS, M_WAITOK); 189 if (bmp == NULL) { 190 error = ENOMEM; 191 goto out; 192 } 193 bmp->devvp = devvp; 194 bmp->mountp = mp; 195 if ((error = sysvbfs_bfs_init(&bmp->bfs, devvp)) != 0) { 196 free(bmp, M_SYSVBFS_VFS); 197 goto out; 198 } 199 LIST_INIT(&bmp->bnode_head); 200 201 mp->mnt_data = bmp; 202 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)devvp->v_rdev; 203 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_SYSVBFS); 204 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 205 mp->mnt_stat.f_namemax = BFS_FILENAME_MAXLEN; 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 out: 214 if (devopen && error) 215 VOP_CLOSE(devvp, oflags, NOCRED); 216 VOP_UNLOCK(devvp); 217 return error; 218 } 219 220 int 221 sysvbfs_start(struct mount *mp, int flags) 222 { 223 224 DPRINTF("%s:\n", __func__); 225 /* Nothing to do. */ 226 return 0; 227 } 228 229 int 230 sysvbfs_unmount(struct mount *mp, int mntflags) 231 { 232 struct sysvbfs_mount *bmp = (void *)mp->mnt_data; 233 int error; 234 235 DPRINTF("%s: %p\n", __func__, bmp); 236 237 if ((error = vflush(mp, NULLVP, 238 mntflags & MNT_FORCE ? FORCECLOSE : 0)) != 0) 239 return error; 240 241 vn_lock(bmp->devvp, LK_EXCLUSIVE | LK_RETRY); 242 error = VOP_CLOSE(bmp->devvp, FREAD, NOCRED); 243 vput(bmp->devvp); 244 245 sysvbfs_bfs_fini(bmp->bfs); 246 247 free(bmp, M_SYSVBFS_VFS); 248 mp->mnt_data = NULL; 249 mp->mnt_flag &= ~MNT_LOCAL; 250 251 return 0; 252 } 253 254 int 255 sysvbfs_root(struct mount *mp, struct vnode **vpp) 256 { 257 struct vnode *vp; 258 int error; 259 260 DPRINTF("%s:\n", __func__); 261 if ((error = VFS_VGET(mp, BFS_ROOT_INODE, &vp)) != 0) 262 return error; 263 *vpp = vp; 264 265 return 0; 266 } 267 268 int 269 sysvbfs_statvfs(struct mount *mp, struct statvfs *f) 270 { 271 struct sysvbfs_mount *bmp = mp->mnt_data; 272 struct bfs *bfs = bmp->bfs; 273 int free_block; 274 size_t data_block; 275 276 data_block = (bfs->data_end - bfs->data_start) >> BFS_BSHIFT; 277 if (bfs_inode_alloc(bfs, 0, 0, &free_block) != 0) 278 free_block = 0; 279 else 280 free_block = (bfs->data_end >> BFS_BSHIFT) - free_block; 281 282 DPRINTF("%s: %d %d %d\n", __func__, bfs->data_start, 283 bfs->data_end, free_block); 284 285 f->f_bsize = BFS_BSIZE; 286 f->f_frsize = BFS_BSIZE; 287 f->f_iosize = BFS_BSIZE; 288 f->f_blocks = data_block; 289 f->f_bfree = free_block; 290 f->f_bavail = f->f_bfree; 291 f->f_bresvd = 0; 292 f->f_files = bfs->n_inode; 293 f->f_ffree = bfs->max_inode - f->f_files; 294 f->f_favail = f->f_ffree; 295 f->f_fresvd = 0; 296 copy_statvfs_info(f, mp); 297 298 return 0; 299 } 300 301 int 302 sysvbfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 303 { 304 struct sysvbfs_mount *bmp = mp->mnt_data; 305 struct sysvbfs_node *bnode; 306 struct vnode *v; 307 int err, error; 308 309 DPRINTF("%s:\n", __func__); 310 error = 0; 311 mutex_enter(&mntvnode_lock); 312 for (bnode = LIST_FIRST(&bmp->bnode_head); bnode != NULL; 313 bnode = LIST_NEXT(bnode, link)) { 314 v = bnode->vnode; 315 mutex_enter(&v->v_interlock); 316 mutex_exit(&mntvnode_lock); 317 err = vget(v, LK_EXCLUSIVE | LK_NOWAIT); 318 if (err == 0) { 319 err = VOP_FSYNC(v, cred, FSYNC_WAIT, 0, 0); 320 vput(v); 321 } 322 if (err != 0) 323 error = err; 324 mutex_enter(&mntvnode_lock); 325 } 326 mutex_exit(&mntvnode_lock); 327 328 return error; 329 } 330 331 int 332 sysvbfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 333 { 334 struct sysvbfs_mount *bmp = mp->mnt_data; 335 struct bfs *bfs = bmp->bfs; 336 struct vnode *vp; 337 struct sysvbfs_node *bnode; 338 struct bfs_inode *inode; 339 int error; 340 341 DPRINTF("%s: i-node=%lld\n", __func__, (long long)ino); 342 /* Lookup requested i-node */ 343 if (!bfs_inode_lookup(bfs, ino, &inode)) { 344 DPRINTF("bfs_inode_lookup failed.\n"); 345 return ENOENT; 346 } 347 348 retry: 349 mutex_enter(&mntvnode_lock); 350 for (bnode = LIST_FIRST(&bmp->bnode_head); bnode != NULL; 351 bnode = LIST_NEXT(bnode, link)) { 352 if (bnode->inode->number == ino) { 353 vp = bnode->vnode; 354 mutex_enter(&vp->v_interlock); 355 mutex_exit(&mntvnode_lock); 356 if (vget(vp, LK_EXCLUSIVE) == 0) { 357 *vpp = vp; 358 return 0; 359 } else { 360 goto retry; 361 } 362 } 363 } 364 mutex_exit(&mntvnode_lock); 365 366 /* Allocate v-node. */ 367 if ((error = getnewvnode(VT_SYSVBFS, mp, sysvbfs_vnodeop_p, &vp)) != 368 0) { 369 DPRINTF("%s: getnewvnode error.\n", __func__); 370 return error; 371 } 372 /* Lock vnode here */ 373 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 374 375 /* Allocate i-node */ 376 vp->v_data = pool_get(&sysvbfs_node_pool, PR_WAITOK); 377 memset(vp->v_data, 0, sizeof(struct sysvbfs_node)); 378 bnode = vp->v_data; 379 mutex_enter(&mntvnode_lock); 380 LIST_INSERT_HEAD(&bmp->bnode_head, bnode, link); 381 mutex_exit(&mntvnode_lock); 382 bnode->vnode = vp; 383 bnode->bmp = bmp; 384 bnode->inode = inode; 385 bnode->lockf = NULL; /* advlock */ 386 387 if (ino == BFS_ROOT_INODE) { /* BFS is flat filesystem */ 388 vp->v_type = VDIR; 389 vp->v_vflag |= VV_ROOT; 390 } else { 391 vp->v_type = VREG; 392 } 393 394 genfs_node_init(vp, &sysvbfs_genfsops); 395 uvm_vnp_setsize(vp, bfs_file_size(inode)); 396 *vpp = vp; 397 398 return 0; 399 } 400 401 int 402 sysvbfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp) 403 { 404 405 DPRINTF("%s:\n", __func__); 406 /* notyet */ 407 return EOPNOTSUPP; 408 } 409 410 int 411 sysvbfs_vptofh(struct vnode *vpp, struct fid *fid, size_t *fh_size) 412 { 413 414 DPRINTF("%s:\n", __func__); 415 /* notyet */ 416 return EOPNOTSUPP; 417 } 418 419 MALLOC_DECLARE(M_BFS); 420 MALLOC_DECLARE(M_SYSVBFS_VNODE); 421 422 void 423 sysvbfs_init(void) 424 { 425 426 DPRINTF("%s:\n", __func__); 427 malloc_type_attach(M_SYSVBFS_VFS); 428 malloc_type_attach(M_BFS); 429 malloc_type_attach(M_SYSVBFS_VNODE); 430 pool_init(&sysvbfs_node_pool, sizeof(struct sysvbfs_node), 0, 0, 0, 431 "sysvbfs_node_pool", &pool_allocator_nointr, IPL_NONE); 432 } 433 434 void 435 sysvbfs_reinit(void) 436 { 437 438 /* Nothing to do. */ 439 DPRINTF("%s:\n", __func__); 440 } 441 442 void 443 sysvbfs_done(void) 444 { 445 446 DPRINTF("%s:\n", __func__); 447 pool_destroy(&sysvbfs_node_pool); 448 malloc_type_detach(M_BFS); 449 malloc_type_detach(M_SYSVBFS_VFS); 450 malloc_type_detach(M_SYSVBFS_VNODE); 451 } 452 453 int 454 sysvbfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, 455 kauth_cred_t cred) 456 { 457 458 return 0; 459 } 460
Indexes created Mon Sep 22 21:09:42 GMT 2025