tmpfs_vfsops.c revision 1.5
1 /* $NetBSD: tmpfs_vfsops.c,v 1.5 2005/09/23 13:59:16 jmmv Exp $ */ 2 3 /* 4 * Copyright (c) 2005 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Julio M. Merino Vidal. 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Efficient memory file system. 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: tmpfs_vfsops.c,v 1.5 2005/09/23 13:59:16 jmmv Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/types.h> 48 #include <sys/malloc.h> 49 #include <sys/mount.h> 50 #include <sys/systm.h> 51 #include <sys/vnode.h> 52 53 #include <fs/tmpfs/tmpfs.h> 54 55 MALLOC_DEFINE(M_TMPFSMNT, "tmpfs mount", "tmpfs mount structures"); 56 57 /* --------------------------------------------------------------------- */ 58 59 static int tmpfs_mount(struct mount *, const char *, void *, 60 struct nameidata *, struct proc *); 61 static int tmpfs_start(struct mount *, int, struct proc *); 62 static int tmpfs_unmount(struct mount *, int, struct proc *); 63 static int tmpfs_root(struct mount *, struct vnode **); 64 static int tmpfs_quotactl(struct mount *, int, uid_t, void *, 65 struct proc *); 66 static int tmpfs_vget(struct mount *, ino_t, struct vnode **); 67 static int tmpfs_fhtovp(struct mount *, struct fid *, struct vnode **); 68 static int tmpfs_vptofh(struct vnode *, struct fid *); 69 static int tmpfs_statvfs(struct mount *, struct statvfs *, struct proc *); 70 static int tmpfs_sync(struct mount *, int, struct ucred *, struct proc *); 71 static void tmpfs_init(void); 72 static void tmpfs_done(void); 73 static int tmpfs_snapshot(struct mount *, struct vnode *, 74 struct timespec *); 75 76 /* --------------------------------------------------------------------- */ 77 78 static int 79 tmpfs_mount(struct mount *mp, const char *path, void *data, 80 struct nameidata *ndp, struct proc *p) 81 { 82 int error; 83 ino_t nodes; 84 size_t pages; 85 struct tmpfs_mount *tmp; 86 struct tmpfs_node *root; 87 struct tmpfs_args args; 88 89 /* Handle retrieval of mount point arguments. */ 90 if (mp->mnt_flag & MNT_GETARGS) { 91 if (mp->mnt_data == NULL) 92 return EIO; 93 tmp = VFS_TO_TMPFS(mp); 94 95 args.ta_version = TMPFS_ARGS_VERSION; 96 args.ta_nodes_max = tmp->tm_nodes_max; 97 args.ta_size_max = tmp->tm_pages_max * PAGE_SIZE; 98 99 root = tmp->tm_root; 100 args.ta_root_uid = root->tn_uid; 101 args.ta_root_gid = root->tn_gid; 102 args.ta_root_mode = root->tn_mode; 103 104 return copyout(&args, data, sizeof(args)); 105 } 106 107 /* Verify that we have parameters, as they are required. */ 108 if (data == NULL) 109 return EINVAL; 110 111 /* Get the mount parameters. */ 112 error = copyin(data, &args, sizeof(args)); 113 if (error != 0) 114 return error; 115 116 if (mp->mnt_flag & MNT_UPDATE) { 117 /* XXX: There is no support yet to update file system 118 * settings. Should be added. */ 119 120 return EOPNOTSUPP; 121 } 122 123 if (args.ta_version != TMPFS_ARGS_VERSION) 124 return EINVAL; 125 126 /* Do not allow mounts if we do not have enough memory to preserve 127 * the minimum reserved pages. */ 128 if (tmpfs_mem_info(TRUE) < TMPFS_PAGES_RESERVED) 129 return EINVAL; 130 131 /* Get the maximum number of memory pages this file system is 132 * allowed to use, based on the maximum size the user passed in 133 * the mount structure. A value of zero is treated as if the 134 * maximum available space was requested. */ 135 if (args.ta_size_max == 0) 136 pages = SIZE_MAX; 137 else 138 pages = args.ta_size_max / PAGE_SIZE + 139 (args.ta_size_max % PAGE_SIZE == 0 ? 0 : 1); 140 141 if (args.ta_nodes_max == 0) 142 nodes = pages * PAGE_SIZE / 1024; 143 else 144 nodes = args.ta_nodes_max; 145 146 /* Allocate the tmpfs mount structure and fill it. */ 147 tmp = (struct tmpfs_mount *)malloc(sizeof(struct tmpfs_mount), 148 M_TMPFSMNT, M_WAITOK); 149 KASSERT(tmp != NULL); 150 151 tmp->tm_nodes_max = nodes; 152 tmp->tm_nodes_last = 2; 153 LIST_INIT(&tmp->tm_nodes_used); 154 LIST_INIT(&tmp->tm_nodes_avail); 155 156 tmp->tm_pages_max = pages; 157 tmp->tm_pages_used = 0; 158 tmpfs_pool_init(&tmp->tm_dirent_pool, sizeof(struct tmpfs_dirent), 159 "dirent", tmp); 160 tmpfs_pool_init(&tmp->tm_node_pool, sizeof(struct tmpfs_node), 161 "node", tmp); 162 tmpfs_str_pool_init(&tmp->tm_str_pool, tmp); 163 164 /* Allocate the root node. */ 165 error = tmpfs_alloc_node(tmp, VDIR, args.ta_root_uid, 166 args.ta_root_gid, args.ta_root_mode, NULL, NULL, VNOVAL, p, 167 &root); 168 KASSERT(error == 0 && root != NULL); 169 tmp->tm_root = root; 170 171 mp->mnt_data = tmp; 172 mp->mnt_flag |= MNT_LOCAL; 173 mp->mnt_stat.f_namemax = MAXNAMLEN; 174 vfs_getnewfsid(mp); 175 176 return set_statvfs_info(path, UIO_USERSPACE, "tmpfs", UIO_SYSSPACE, 177 mp, p); 178 } 179 180 /* --------------------------------------------------------------------- */ 181 182 static int 183 tmpfs_start(struct mount *mp, int flags, struct proc *p) 184 { 185 186 return 0; 187 } 188 189 /* --------------------------------------------------------------------- */ 190 191 /* ARGSUSED2 */ 192 static int 193 tmpfs_unmount(struct mount *mp, int mntflags, struct proc *p) 194 { 195 int error; 196 int flags = 0; 197 struct tmpfs_mount *tmp; 198 struct tmpfs_node *node; 199 200 /* Handle forced unmounts. */ 201 if (mntflags & MNT_FORCE) 202 flags |= FORCECLOSE; 203 204 /* Finalize all pending I/O. */ 205 error = vflush(mp, NULL, flags); 206 if (error != 0) 207 return error; 208 209 tmp = VFS_TO_TMPFS(mp); 210 211 /* Free all associated data. The loop iterates over the linked list 212 * we have containing all used nodes. For each of them that is 213 * a directory, we free all its directory entries. Note that after 214 * freeing a node, it will automatically go to the available list, 215 * so we will later have to iterate over it to release its items. */ 216 node = LIST_FIRST(&tmp->tm_nodes_used); 217 while (node != NULL) { 218 struct tmpfs_node *next; 219 220 if (node->tn_type == VDIR) { 221 struct tmpfs_dirent *de; 222 223 de = TAILQ_FIRST(&node->tn_dir); 224 while (de != NULL) { 225 struct tmpfs_dirent *nde; 226 227 nde = TAILQ_NEXT(de, td_entries); 228 tmpfs_free_dirent(tmp, de, FALSE); 229 de = nde; 230 node->tn_size -= sizeof(struct tmpfs_dirent); 231 } 232 } 233 234 next = LIST_NEXT(node, tn_entries); 235 tmpfs_free_node(tmp, node); 236 node = next; 237 } 238 node = LIST_FIRST(&tmp->tm_nodes_avail); 239 while (node != NULL) { 240 struct tmpfs_node *next; 241 242 next = LIST_NEXT(node, tn_entries); 243 LIST_REMOVE(node, tn_entries); 244 TMPFS_POOL_PUT(&tmp->tm_node_pool, node); 245 node = next; 246 } 247 248 tmpfs_pool_destroy(&tmp->tm_dirent_pool); 249 tmpfs_pool_destroy(&tmp->tm_node_pool); 250 tmpfs_str_pool_destroy(&tmp->tm_str_pool); 251 252 KASSERT(tmp->tm_pages_used == 0); 253 254 /* Throw away the tmpfs_mount structure. */ 255 free(mp->mnt_data, M_TMPFSMNT); 256 mp->mnt_data = NULL; 257 258 return 0; 259 } 260 261 /* --------------------------------------------------------------------- */ 262 263 static int 264 tmpfs_root(struct mount *mp, struct vnode **vpp) 265 { 266 267 return tmpfs_alloc_vp(mp, VFS_TO_TMPFS(mp)->tm_root, vpp); 268 } 269 270 /* --------------------------------------------------------------------- */ 271 272 static int 273 tmpfs_quotactl(struct mount *mp, int cmd, uid_t uid, void *arg, 274 struct proc *p) 275 { 276 277 printf("tmpfs_quotactl called; need for it unknown yet\n"); 278 return EOPNOTSUPP; 279 } 280 281 /* --------------------------------------------------------------------- */ 282 283 static int 284 tmpfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 285 { 286 287 printf("tmpfs_vget called; need for it unknown yet\n"); 288 return EOPNOTSUPP; 289 } 290 291 /* --------------------------------------------------------------------- */ 292 293 static int 294 tmpfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 295 { 296 boolean_t found; 297 struct tmpfs_fid *tfhp; 298 struct tmpfs_mount *tmp; 299 struct tmpfs_node *node; 300 301 tmp = VFS_TO_TMPFS(mp); 302 303 tfhp = (struct tmpfs_fid *)fhp; 304 if (tfhp->tf_len != sizeof(struct tmpfs_fid)) 305 return EINVAL; 306 307 if (tfhp->tf_id >= tmp->tm_nodes_max) 308 return EINVAL; 309 310 found = FALSE; 311 LIST_FOREACH(node, &tmp->tm_nodes_used, tn_entries) { 312 if (node->tn_id == tfhp->tf_id && 313 node->tn_gen == tfhp->tf_gen) { 314 found = TRUE; 315 break; 316 } 317 } 318 319 return found ? tmpfs_alloc_vp(mp, node, vpp) : EINVAL; 320 } 321 322 /* --------------------------------------------------------------------- */ 323 324 static int 325 tmpfs_vptofh(struct vnode *vp, struct fid *fhp) 326 { 327 struct tmpfs_fid *tfhp; 328 struct tmpfs_node *node; 329 330 tfhp = (struct tmpfs_fid *)fhp; 331 node = VP_TO_TMPFS_NODE(vp); 332 333 tfhp->tf_len = sizeof(struct tmpfs_fid); 334 tfhp->tf_id = node->tn_id; 335 tfhp->tf_gen = node->tn_gen; 336 337 return 0; 338 } 339 340 /* --------------------------------------------------------------------- */ 341 342 /* ARGSUSED2 */ 343 static int 344 tmpfs_statvfs(struct mount *mp, struct statvfs *sbp, struct proc *p) 345 { 346 fsfilcnt_t freenodes, usednodes; 347 struct tmpfs_mount *tmp; 348 struct tmpfs_node *dummy; 349 350 tmp = VFS_TO_TMPFS(mp); 351 352 sbp->f_iosize = sbp->f_frsize = sbp->f_bsize = PAGE_SIZE; 353 354 sbp->f_blocks = TMPFS_PAGES_MAX(tmp); 355 sbp->f_bavail = sbp->f_bfree = TMPFS_PAGES_AVAIL(tmp); 356 sbp->f_bresvd = 0; 357 358 freenodes = MIN(tmp->tm_nodes_max - tmp->tm_nodes_last, 359 TMPFS_PAGES_AVAIL(tmp) * PAGE_SIZE / sizeof(struct tmpfs_node)); 360 LIST_FOREACH(dummy, &tmp->tm_nodes_avail, tn_entries) 361 freenodes++; 362 363 usednodes = 0; 364 LIST_FOREACH(dummy, &tmp->tm_nodes_used, tn_entries) 365 usednodes++; 366 367 sbp->f_files = freenodes + usednodes; 368 sbp->f_favail = sbp->f_ffree = freenodes; 369 sbp->f_fresvd = 0; 370 371 copy_statvfs_info(sbp, mp); 372 373 return 0; 374 } 375 376 /* --------------------------------------------------------------------- */ 377 378 /* ARGSUSED0 */ 379 static int 380 tmpfs_sync(struct mount *mp, int waitfor, struct ucred *uc, struct proc *p) 381 { 382 383 return 0; 384 } 385 386 /* --------------------------------------------------------------------- */ 387 388 static void 389 tmpfs_init(void) 390 { 391 392 #ifdef _LKM 393 malloc_type_attach(M_TMPFSMNT); 394 #endif 395 } 396 397 /* --------------------------------------------------------------------- */ 398 399 static void 400 tmpfs_done(void) 401 { 402 403 #ifdef _LKM 404 malloc_type_detach(M_TMPFSMNT); 405 #endif 406 } 407 408 /* --------------------------------------------------------------------- */ 409 410 static int 411 tmpfs_snapshot(struct mount *mp, struct vnode *vp, struct timespec *ctime) 412 { 413 414 return EOPNOTSUPP; 415 } 416 417 /* --------------------------------------------------------------------- */ 418 419 /* 420 * tmpfs vfs operations. 421 */ 422 423 extern const struct vnodeopv_desc tmpfs_fifoop_opv_desc; 424 extern const struct vnodeopv_desc tmpfs_specop_opv_desc; 425 extern const struct vnodeopv_desc tmpfs_vnodeop_opv_desc; 426 427 const struct vnodeopv_desc * const tmpfs_vnodeopv_descs[] = { 428 &tmpfs_fifoop_opv_desc, 429 &tmpfs_specop_opv_desc, 430 &tmpfs_vnodeop_opv_desc, 431 NULL, 432 }; 433 434 struct vfsops tmpfs_vfsops = { 435 MOUNT_TMPFS, /* vfs_name */ 436 tmpfs_mount, /* vfs_mount */ 437 tmpfs_start, /* vfs_start */ 438 tmpfs_unmount, /* vfs_unmount */ 439 tmpfs_root, /* vfs_root */ 440 tmpfs_quotactl, /* vfs_quotactl */ 441 tmpfs_statvfs, /* vfs_statvfs */ 442 tmpfs_sync, /* vfs_sync */ 443 tmpfs_vget, /* vfs_vget */ 444 tmpfs_fhtovp, /* vfs_fhtovp */ 445 tmpfs_vptofh, /* vfs_vptofh */ 446 tmpfs_init, /* vfs_init */ 447 NULL, /* vfs_reinit */ 448 tmpfs_done, /* vfs_done */ 449 NULL, /* vfs_mountroot */ 450 tmpfs_snapshot, /* vfs_snapshot */ 451 vfs_stdextattrctl, /* vfs_extattrctl */ 452 tmpfs_vnodeopv_descs, 453 }; 454 VFS_ATTACH(tmpfs_vfsops); 455
Indexes created Fri Sep 26 20:09:58 GMT 2025