sysvbfs_vfsops.c revision 1.26.14.1
1 /* $NetBSD: sysvbfs_vfsops.c,v 1.26.14.1 2014/04/28 16:03:15 sborrill 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 1.26.14.1 2014/04/28 16:03:15 sborrill 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 (args == NULL) 83 return EINVAL; 84 if (*data_len < sizeof *args) 85 return EINVAL; 86 87 if (mp->mnt_flag & MNT_GETARGS) { 88 if ((bmp = (void *)mp->mnt_data) == NULL) 89 return EIO; 90 args->fspec = NULL; 91 *data_len = sizeof *args; 92 return 0; 93 } 94 95 96 DPRINTF("%s: args->fspec=%s\n", __func__, args->fspec); 97 update = mp->mnt_flag & MNT_UPDATE; 98 if (args->fspec == NULL) { 99 /* nothing to do. */ 100 return EINVAL; 101 } 102 103 if (args->fspec != NULL) { 104 /* Look up the name and verify that it's sane. */ 105 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, args->fspec); 106 if ((error = namei(&nd)) != 0) 107 return (error); 108 devvp = nd.ni_vp; 109 110 if (!update) { 111 /* 112 * Be sure this is a valid block device 113 */ 114 if (devvp->v_type != VBLK) 115 error = ENOTBLK; 116 else if (bdevsw_lookup(devvp->v_rdev) == NULL) 117 error = ENXIO; 118 } else { 119 /* 120 * Be sure we're still naming the same device 121 * used for our initial mount 122 */ 123 if (devvp != bmp->devvp) 124 error = EINVAL; 125 } 126 } 127 128 /* 129 * If mount by non-root, then verify that user has necessary 130 * permissions on the device. 131 */ 132 if (error == 0 && kauth_authorize_generic(l->l_cred, 133 KAUTH_GENERIC_ISSUSER, NULL)) { 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 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 140 error = VOP_ACCESS(devvp, accessmode, l->l_cred); 141 VOP_UNLOCK(devvp, 0); 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 struct partinfo dpart; 168 int error, oflags; 169 170 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 171 error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0); 172 VOP_UNLOCK(devvp, 0); 173 if (error) 174 return error; 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 return error; 182 183 /* Get partition information */ 184 if ((error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, cred)) != 0) 185 return error; 186 187 bmp = malloc(sizeof(struct sysvbfs_mount), M_SYSVBFS_VFS, M_WAITOK); 188 if (bmp == NULL) 189 return ENOMEM; 190 bmp->devvp = devvp; 191 bmp->mountp = mp; 192 if ((error = sysvbfs_bfs_init(&bmp->bfs, devvp)) != 0) { 193 free(bmp, M_SYSVBFS_VFS); 194 return error; 195 } 196 LIST_INIT(&bmp->bnode_head); 197 198 mp->mnt_data = bmp; 199 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)devvp->v_rdev; 200 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_SYSVBFS); 201 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 202 mp->mnt_flag |= MNT_LOCAL; 203 mp->mnt_dev_bshift = BFS_BSHIFT; 204 mp->mnt_fs_bshift = BFS_BSHIFT; 205 206 DPRINTF("fstype=%d dtype=%d bsize=%d\n", dpart.part->p_fstype, 207 dpart.disklab->d_type, dpart.disklab->d_secsize); 208 209 return 0; 210 } 211 212 int 213 sysvbfs_start(struct mount *mp, int flags) 214 { 215 216 DPRINTF("%s:\n", __func__); 217 /* Nothing to do. */ 218 return 0; 219 } 220 221 int 222 sysvbfs_unmount(struct mount *mp, int mntflags) 223 { 224 struct sysvbfs_mount *bmp = (void *)mp->mnt_data; 225 int error; 226 227 DPRINTF("%s: %p\n", __func__, bmp); 228 229 if ((error = vflush(mp, NULLVP, 230 mntflags & MNT_FORCE ? FORCECLOSE : 0)) != 0) 231 return error; 232 233 vn_lock(bmp->devvp, LK_EXCLUSIVE | LK_RETRY); 234 error = VOP_CLOSE(bmp->devvp, FREAD, NOCRED); 235 vput(bmp->devvp); 236 237 sysvbfs_bfs_fini(bmp->bfs); 238 239 free(bmp, M_SYSVBFS_VFS); 240 mp->mnt_data = NULL; 241 mp->mnt_flag &= ~MNT_LOCAL; 242 243 return 0; 244 } 245 246 int 247 sysvbfs_root(struct mount *mp, struct vnode **vpp) 248 { 249 struct vnode *vp; 250 int error; 251 252 DPRINTF("%s:\n", __func__); 253 if ((error = VFS_VGET(mp, BFS_ROOT_INODE, &vp)) != 0) 254 return error; 255 *vpp = vp; 256 257 return 0; 258 } 259 260 int 261 sysvbfs_statvfs(struct mount *mp, struct statvfs *f) 262 { 263 struct sysvbfs_mount *bmp = mp->mnt_data; 264 struct bfs *bfs = bmp->bfs; 265 int free_block; 266 size_t data_block; 267 268 data_block = (bfs->data_end - bfs->data_start) >> BFS_BSHIFT; 269 if (bfs_inode_alloc(bfs, 0, 0, &free_block) != 0) 270 free_block = 0; 271 else 272 free_block = (bfs->data_end >> BFS_BSHIFT) - free_block; 273 274 DPRINTF("%s: %d %d %d\n", __func__, bfs->data_start, 275 bfs->data_end, free_block); 276 277 f->f_bsize = BFS_BSIZE; 278 f->f_frsize = BFS_BSIZE; 279 f->f_iosize = BFS_BSIZE; 280 f->f_blocks = data_block; 281 f->f_bfree = free_block; 282 f->f_bavail = f->f_bfree; 283 f->f_bresvd = 0; 284 f->f_files = bfs->n_inode; 285 f->f_ffree = bfs->max_inode - f->f_files; 286 f->f_favail = f->f_ffree; 287 f->f_fresvd = 0; 288 copy_statvfs_info(f, mp); 289 290 return 0; 291 } 292 293 int 294 sysvbfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 295 { 296 struct sysvbfs_mount *bmp = mp->mnt_data; 297 struct sysvbfs_node *bnode; 298 struct vnode *v; 299 int err, error; 300 301 DPRINTF("%s:\n", __func__); 302 error = 0; 303 mutex_enter(&mntvnode_lock); 304 for (bnode = LIST_FIRST(&bmp->bnode_head); bnode != NULL; 305 bnode = LIST_NEXT(bnode, link)) { 306 v = bnode->vnode; 307 mutex_enter(&v->v_interlock); 308 mutex_exit(&mntvnode_lock); 309 err = vget(v, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 310 if (err == 0) { 311 err = VOP_FSYNC(v, cred, FSYNC_WAIT, 0, 0); 312 vput(v); 313 } 314 if (err != 0) 315 error = err; 316 mutex_enter(&mntvnode_lock); 317 } 318 mutex_exit(&mntvnode_lock); 319 320 return error; 321 } 322 323 int 324 sysvbfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 325 { 326 struct sysvbfs_mount *bmp = mp->mnt_data; 327 struct bfs *bfs = bmp->bfs; 328 struct vnode *vp; 329 struct sysvbfs_node *bnode; 330 struct bfs_inode *inode; 331 int error; 332 333 DPRINTF("%s: i-node=%lld\n", __func__, (long long)ino); 334 /* Lookup requested i-node */ 335 if (!bfs_inode_lookup(bfs, ino, &inode)) { 336 DPRINTF("bfs_inode_lookup failed.\n"); 337 return ENOENT; 338 } 339 for (bnode = LIST_FIRST(&bmp->bnode_head); bnode != NULL; 340 bnode = LIST_NEXT(bnode, link)) { 341 if (bnode->inode->number == ino) { 342 *vpp = bnode->vnode; 343 } 344 } 345 346 /* Allocate v-node. */ 347 if ((error = getnewvnode(VT_SYSVBFS, mp, sysvbfs_vnodeop_p, &vp)) != 348 0) { 349 DPRINTF("%s: getnewvnode error.\n", __func__); 350 return error; 351 } 352 /* Lock vnode here */ 353 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 354 355 /* Allocate i-node */ 356 vp->v_data = pool_get(&sysvbfs_node_pool, PR_WAITOK); 357 memset(vp->v_data, 0, sizeof(struct sysvbfs_node)); 358 bnode = vp->v_data; 359 mutex_enter(&mntvnode_lock); 360 LIST_INSERT_HEAD(&bmp->bnode_head, bnode, link); 361 mutex_exit(&mntvnode_lock); 362 bnode->vnode = vp; 363 bnode->bmp = bmp; 364 bnode->inode = inode; 365 bnode->lockf = NULL; /* advlock */ 366 367 if (ino == BFS_ROOT_INODE) { /* BFS is flat filesystem */ 368 vp->v_type = VDIR; 369 vp->v_vflag |= VV_ROOT; 370 } else { 371 vp->v_type = VREG; 372 } 373 374 genfs_node_init(vp, &sysvbfs_genfsops); 375 uvm_vnp_setsize(vp, bfs_file_size(inode)); 376 *vpp = vp; 377 378 return 0; 379 } 380 381 int 382 sysvbfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp) 383 { 384 385 DPRINTF("%s:\n", __func__); 386 /* notyet */ 387 return EOPNOTSUPP; 388 } 389 390 int 391 sysvbfs_vptofh(struct vnode *vpp, struct fid *fid, size_t *fh_size) 392 { 393 394 DPRINTF("%s:\n", __func__); 395 /* notyet */ 396 return EOPNOTSUPP; 397 } 398 399 MALLOC_DECLARE(M_BFS); 400 MALLOC_DECLARE(M_SYSVBFS_VNODE); 401 402 void 403 sysvbfs_init(void) 404 { 405 406 DPRINTF("%s:\n", __func__); 407 malloc_type_attach(M_SYSVBFS_VFS); 408 malloc_type_attach(M_BFS); 409 malloc_type_attach(M_SYSVBFS_VNODE); 410 pool_init(&sysvbfs_node_pool, sizeof(struct sysvbfs_node), 0, 0, 0, 411 "sysvbfs_node_pool", &pool_allocator_nointr, IPL_NONE); 412 } 413 414 void 415 sysvbfs_reinit(void) 416 { 417 418 /* Nothing to do. */ 419 DPRINTF("%s:\n", __func__); 420 } 421 422 void 423 sysvbfs_done(void) 424 { 425 426 DPRINTF("%s:\n", __func__); 427 pool_destroy(&sysvbfs_node_pool); 428 malloc_type_detach(M_BFS); 429 malloc_type_detach(M_SYSVBFS_VFS); 430 malloc_type_detach(M_SYSVBFS_VNODE); 431 } 432 433 int 434 sysvbfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, 435 kauth_cred_t cred) 436 { 437 438 return 0; 439 } 440
Indexes created Tue Sep 23 14:10:03 GMT 2025