| 1 | /* $NetBSD: ext2fs_vfsops.c,v 1.204 2016/08/25 07:18:35 christos Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1989, 1991, 1993, 1994 |
| 5 | * The Regents of the University of California. All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * 3. Neither the name of the University nor the names of its contributors |
| 16 | * may be used to endorse or promote products derived from this software |
| 17 | * without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 29 | * SUCH DAMAGE. |
| 30 | * |
| 31 | * @(#)ffs_vfsops.c 8.14 (Berkeley) 11/28/94 |
| 32 | * Modified for ext2fs by Manuel Bouyer. |
| 33 | */ |
| 34 | |
| 35 | /* |
| 36 | * Copyright (c) 1997 Manuel Bouyer. |
| 37 | * |
| 38 | * Redistribution and use in source and binary forms, with or without |
| 39 | * modification, are permitted provided that the following conditions |
| 40 | * are met: |
| 41 | * 1. Redistributions of source code must retain the above copyright |
| 42 | * notice, this list of conditions and the following disclaimer. |
| 43 | * 2. Redistributions in binary form must reproduce the above copyright |
| 44 | * notice, this list of conditions and the following disclaimer in the |
| 45 | * documentation and/or other materials provided with the distribution. |
| 46 | * |
| 47 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 48 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 49 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 50 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 51 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 52 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 53 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 54 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 55 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 56 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 57 | * |
| 58 | * @(#)ffs_vfsops.c 8.14 (Berkeley) 11/28/94 |
| 59 | * Modified for ext2fs by Manuel Bouyer. |
| 60 | */ |
| 61 | |
| 62 | #include <sys/cdefs.h> |
| 63 | __KERNEL_RCSID(0, "$NetBSD: ext2fs_vfsops.c,v 1.204 2016/08/25 07:18:35 christos Exp $" ); |
| 64 | |
| 65 | #if defined(_KERNEL_OPT) |
| 66 | #include "opt_compat_netbsd.h" |
| 67 | #endif |
| 68 | |
| 69 | #include <sys/param.h> |
| 70 | #include <sys/systm.h> |
| 71 | #include <sys/sysctl.h> |
| 72 | #include <sys/namei.h> |
| 73 | #include <sys/proc.h> |
| 74 | #include <sys/kernel.h> |
| 75 | #include <sys/vnode.h> |
| 76 | #include <sys/socket.h> |
| 77 | #include <sys/mount.h> |
| 78 | #include <sys/buf.h> |
| 79 | #include <sys/device.h> |
| 80 | #include <sys/mbuf.h> |
| 81 | #include <sys/file.h> |
| 82 | #include <sys/disklabel.h> |
| 83 | #include <sys/ioctl.h> |
| 84 | #include <sys/errno.h> |
| 85 | #include <sys/pool.h> |
| 86 | #include <sys/lock.h> |
| 87 | #include <sys/conf.h> |
| 88 | #include <sys/kauth.h> |
| 89 | #include <sys/module.h> |
| 90 | |
| 91 | #include <miscfs/genfs/genfs.h> |
| 92 | #include <miscfs/specfs/specdev.h> |
| 93 | |
| 94 | #include <ufs/ufs/quota.h> |
| 95 | #include <ufs/ufs/ufsmount.h> |
| 96 | #include <ufs/ufs/inode.h> |
| 97 | #include <ufs/ufs/dir.h> |
| 98 | #include <ufs/ufs/ufs_extern.h> |
| 99 | |
| 100 | #include <ufs/ext2fs/ext2fs.h> |
| 101 | #include <ufs/ext2fs/ext2fs_dir.h> |
| 102 | #include <ufs/ext2fs/ext2fs_extern.h> |
| 103 | |
| 104 | MODULE(MODULE_CLASS_VFS, ext2fs, "ffs" ); |
| 105 | |
| 106 | int ext2fs_sbupdate(struct ufsmount *, int); |
| 107 | static int ext2fs_sbfill(struct m_ext2fs *, int); |
| 108 | |
| 109 | static struct sysctllog *ext2fs_sysctl_log; |
| 110 | |
| 111 | extern const struct vnodeopv_desc ext2fs_vnodeop_opv_desc; |
| 112 | extern const struct vnodeopv_desc ext2fs_specop_opv_desc; |
| 113 | extern const struct vnodeopv_desc ext2fs_fifoop_opv_desc; |
| 114 | |
| 115 | const struct vnodeopv_desc * const ext2fs_vnodeopv_descs[] = { |
| 116 | &ext2fs_vnodeop_opv_desc, |
| 117 | &ext2fs_specop_opv_desc, |
| 118 | &ext2fs_fifoop_opv_desc, |
| 119 | NULL, |
| 120 | }; |
| 121 | |
| 122 | struct vfsops ext2fs_vfsops = { |
| 123 | .vfs_name = MOUNT_EXT2FS, |
| 124 | .vfs_min_mount_data = sizeof (struct ufs_args), |
| 125 | .vfs_mount = ext2fs_mount, |
| 126 | .vfs_start = ufs_start, |
| 127 | .vfs_unmount = ext2fs_unmount, |
| 128 | .vfs_root = ufs_root, |
| 129 | .vfs_quotactl = ufs_quotactl, |
| 130 | .vfs_statvfs = ext2fs_statvfs, |
| 131 | .vfs_sync = ext2fs_sync, |
| 132 | .vfs_vget = ufs_vget, |
| 133 | .vfs_loadvnode = ext2fs_loadvnode, |
| 134 | .vfs_fhtovp = ext2fs_fhtovp, |
| 135 | .vfs_vptofh = ext2fs_vptofh, |
| 136 | .vfs_init = ext2fs_init, |
| 137 | .vfs_reinit = ext2fs_reinit, |
| 138 | .vfs_done = ext2fs_done, |
| 139 | .vfs_mountroot = ext2fs_mountroot, |
| 140 | .vfs_snapshot = (void *)eopnotsupp, |
| 141 | .vfs_extattrctl = vfs_stdextattrctl, |
| 142 | .vfs_suspendctl = (void *)eopnotsupp, |
| 143 | .vfs_renamelock_enter = genfs_renamelock_enter, |
| 144 | .vfs_renamelock_exit = genfs_renamelock_exit, |
| 145 | .vfs_fsync = (void *)eopnotsupp, |
| 146 | .vfs_opv_descs = ext2fs_vnodeopv_descs |
| 147 | }; |
| 148 | |
| 149 | static const struct genfs_ops ext2fs_genfsops = { |
| 150 | .gop_size = genfs_size, |
| 151 | .gop_alloc = ext2fs_gop_alloc, |
| 152 | .gop_write = genfs_gop_write, |
| 153 | .gop_markupdate = ufs_gop_markupdate, |
| 154 | }; |
| 155 | |
| 156 | static const struct ufs_ops ext2fs_ufsops = { |
| 157 | .uo_itimes = ext2fs_itimes, |
| 158 | .uo_update = ext2fs_update, |
| 159 | .uo_bufrd = ext2fs_bufrd, |
| 160 | .uo_bufwr = ext2fs_bufwr, |
| 161 | }; |
| 162 | |
| 163 | /* Fill in the inode uid/gid from ext2 halves. */ |
| 164 | void |
| 165 | ext2fs_set_inode_guid(struct inode *ip) |
| 166 | { |
| 167 | |
| 168 | ip->i_gid = ip->i_e2fs_gid; |
| 169 | ip->i_uid = ip->i_e2fs_uid; |
| 170 | if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) { |
| 171 | ip->i_gid |= ip->i_e2fs_gid_high << 16; |
| 172 | ip->i_uid |= ip->i_e2fs_uid_high << 16; |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | static int |
| 177 | ext2fs_modcmd(modcmd_t cmd, void *arg) |
| 178 | { |
| 179 | int error; |
| 180 | |
| 181 | switch (cmd) { |
| 182 | case MODULE_CMD_INIT: |
| 183 | error = vfs_attach(&ext2fs_vfsops); |
| 184 | if (error != 0) |
| 185 | break; |
| 186 | sysctl_createv(&ext2fs_sysctl_log, 0, NULL, NULL, |
| 187 | CTLFLAG_PERMANENT, |
| 188 | CTLTYPE_NODE, "ext2fs" , |
| 189 | SYSCTL_DESCR("Linux EXT2FS file system" ), |
| 190 | NULL, 0, NULL, 0, |
| 191 | CTL_VFS, 17, CTL_EOL); |
| 192 | /* |
| 193 | * XXX the "17" above could be dynamic, thereby eliminating |
| 194 | * one more instance of the "number to vfs" mapping problem, |
| 195 | * but "17" is the order as taken from sys/mount.h |
| 196 | */ |
| 197 | break; |
| 198 | case MODULE_CMD_FINI: |
| 199 | error = vfs_detach(&ext2fs_vfsops); |
| 200 | if (error != 0) |
| 201 | break; |
| 202 | sysctl_teardown(&ext2fs_sysctl_log); |
| 203 | break; |
| 204 | default: |
| 205 | error = ENOTTY; |
| 206 | break; |
| 207 | } |
| 208 | |
| 209 | return error; |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * XXX Same structure as FFS inodes? Should we share a common pool? |
| 214 | */ |
| 215 | struct pool ext2fs_inode_pool; |
| 216 | |
| 217 | extern u_long ext2gennumber; |
| 218 | |
| 219 | void |
| 220 | ext2fs_init(void) |
| 221 | { |
| 222 | |
| 223 | pool_init(&ext2fs_inode_pool, sizeof(struct inode), 0, 0, 0, |
| 224 | "ext2fsinopl" , &pool_allocator_nointr, IPL_NONE); |
| 225 | ufs_init(); |
| 226 | } |
| 227 | |
| 228 | void |
| 229 | ext2fs_reinit(void) |
| 230 | { |
| 231 | ufs_reinit(); |
| 232 | } |
| 233 | |
| 234 | void |
| 235 | ext2fs_done(void) |
| 236 | { |
| 237 | |
| 238 | ufs_done(); |
| 239 | pool_destroy(&ext2fs_inode_pool); |
| 240 | } |
| 241 | |
| 242 | static void |
| 243 | ext2fs_sb_setmountinfo(struct m_ext2fs *fs, struct mount *mp) |
| 244 | { |
| 245 | (void)strlcpy(fs->e2fs_fsmnt, mp->mnt_stat.f_mntonname, |
| 246 | sizeof(fs->e2fs_fsmnt)); |
| 247 | if (fs->e2fs_ronly == 0 && fs->e2fs.e2fs_rev > E2FS_REV0) { |
| 248 | (void)strlcpy(fs->e2fs.e2fs_fsmnt, mp->mnt_stat.f_mntonname, |
| 249 | sizeof(fs->e2fs.e2fs_fsmnt)); |
| 250 | |
| 251 | fs->e2fs.e2fs_mtime = time_second; |
| 252 | fs->e2fs.e2fs_mnt_count++; |
| 253 | |
| 254 | fs->e2fs_fmod = 1; |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | /* |
| 259 | * Called by main() when ext2fs is going to be mounted as root. |
| 260 | * |
| 261 | * Name is updated by mount(8) after booting. |
| 262 | */ |
| 263 | |
| 264 | int |
| 265 | ext2fs_mountroot(void) |
| 266 | { |
| 267 | extern struct vnode *rootvp; |
| 268 | struct m_ext2fs *fs; |
| 269 | struct mount *mp; |
| 270 | struct ufsmount *ump; |
| 271 | int error; |
| 272 | |
| 273 | if (device_class(root_device) != DV_DISK) |
| 274 | return ENODEV; |
| 275 | |
| 276 | if ((error = vfs_rootmountalloc(MOUNT_EXT2FS, "root_device" , &mp))) { |
| 277 | vrele(rootvp); |
| 278 | return error; |
| 279 | } |
| 280 | |
| 281 | if ((error = ext2fs_mountfs(rootvp, mp)) != 0) { |
| 282 | vfs_unbusy(mp, false, NULL); |
| 283 | vfs_destroy(mp); |
| 284 | return error; |
| 285 | } |
| 286 | mountlist_append(mp); |
| 287 | ump = VFSTOUFS(mp); |
| 288 | fs = ump->um_e2fs; |
| 289 | ext2fs_sb_setmountinfo(fs, mp); |
| 290 | (void)ext2fs_statvfs(mp, &mp->mnt_stat); |
| 291 | vfs_unbusy(mp, false, NULL); |
| 292 | setrootfstime((time_t)fs->e2fs.e2fs_wtime); |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | /* |
| 297 | * VFS Operations. |
| 298 | * |
| 299 | * mount system call |
| 300 | */ |
| 301 | int |
| 302 | ext2fs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) |
| 303 | { |
| 304 | struct lwp *l = curlwp; |
| 305 | struct vnode *devvp; |
| 306 | struct ufs_args *args = data; |
| 307 | struct ufsmount *ump = NULL; |
| 308 | struct m_ext2fs *fs; |
| 309 | int error = 0, flags, update; |
| 310 | mode_t accessmode; |
| 311 | |
| 312 | if (args == NULL) |
| 313 | return EINVAL; |
| 314 | if (*data_len < sizeof *args) |
| 315 | return EINVAL; |
| 316 | |
| 317 | if (mp->mnt_flag & MNT_GETARGS) { |
| 318 | ump = VFSTOUFS(mp); |
| 319 | if (ump == NULL) |
| 320 | return EIO; |
| 321 | memset(args, 0, sizeof *args); |
| 322 | args->fspec = NULL; |
| 323 | *data_len = sizeof *args; |
| 324 | return 0; |
| 325 | } |
| 326 | |
| 327 | update = mp->mnt_flag & MNT_UPDATE; |
| 328 | |
| 329 | /* Check arguments */ |
| 330 | if (args->fspec != NULL) { |
| 331 | /* |
| 332 | * Look up the name and verify that it's sane. |
| 333 | */ |
| 334 | error = namei_simple_user(args->fspec, |
| 335 | NSM_FOLLOW_NOEMULROOT, &devvp); |
| 336 | if (error != 0) |
| 337 | return error; |
| 338 | |
| 339 | if (!update) { |
| 340 | /* |
| 341 | * Be sure this is a valid block device |
| 342 | */ |
| 343 | if (devvp->v_type != VBLK) |
| 344 | error = ENOTBLK; |
| 345 | else if (bdevsw_lookup(devvp->v_rdev) == NULL) |
| 346 | error = ENXIO; |
| 347 | } else { |
| 348 | /* |
| 349 | * Be sure we're still naming the same device |
| 350 | * used for our initial mount |
| 351 | */ |
| 352 | ump = VFSTOUFS(mp); |
| 353 | if (devvp != ump->um_devvp) { |
| 354 | if (devvp->v_rdev != ump->um_devvp->v_rdev) |
| 355 | error = EINVAL; |
| 356 | else { |
| 357 | vrele(devvp); |
| 358 | devvp = ump->um_devvp; |
| 359 | vref(devvp); |
| 360 | } |
| 361 | } |
| 362 | } |
| 363 | } else { |
| 364 | if (!update) { |
| 365 | /* New mounts must have a filename for the device */ |
| 366 | return EINVAL; |
| 367 | } else { |
| 368 | ump = VFSTOUFS(mp); |
| 369 | devvp = ump->um_devvp; |
| 370 | vref(devvp); |
| 371 | } |
| 372 | } |
| 373 | |
| 374 | /* |
| 375 | * If mount by non-root, then verify that user has necessary |
| 376 | * permissions on the device. |
| 377 | * |
| 378 | * Permission to update a mount is checked higher, so here we presume |
| 379 | * updating the mount is okay (for example, as far as securelevel goes) |
| 380 | * which leaves us with the normal check. |
| 381 | */ |
| 382 | if (error == 0) { |
| 383 | accessmode = VREAD; |
| 384 | if (update ? |
| 385 | (mp->mnt_iflag & IMNT_WANTRDWR) != 0 : |
| 386 | (mp->mnt_flag & MNT_RDONLY) == 0) |
| 387 | accessmode |= VWRITE; |
| 388 | vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); |
| 389 | error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, |
| 390 | KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, |
| 391 | KAUTH_ARG(accessmode)); |
| 392 | VOP_UNLOCK(devvp); |
| 393 | } |
| 394 | |
| 395 | if (error) { |
| 396 | vrele(devvp); |
| 397 | return error; |
| 398 | } |
| 399 | |
| 400 | if (!update) { |
| 401 | int xflags; |
| 402 | |
| 403 | if (mp->mnt_flag & MNT_RDONLY) |
| 404 | xflags = FREAD; |
| 405 | else |
| 406 | xflags = FREAD|FWRITE; |
| 407 | vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); |
| 408 | error = VOP_OPEN(devvp, xflags, FSCRED); |
| 409 | VOP_UNLOCK(devvp); |
| 410 | if (error) |
| 411 | goto fail; |
| 412 | error = ext2fs_mountfs(devvp, mp); |
| 413 | if (error) { |
| 414 | vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); |
| 415 | (void)VOP_CLOSE(devvp, xflags, NOCRED); |
| 416 | VOP_UNLOCK(devvp); |
| 417 | goto fail; |
| 418 | } |
| 419 | |
| 420 | ump = VFSTOUFS(mp); |
| 421 | fs = ump->um_e2fs; |
| 422 | } else { |
| 423 | /* |
| 424 | * Update the mount. |
| 425 | */ |
| 426 | |
| 427 | /* |
| 428 | * The initial mount got a reference on this |
| 429 | * device, so drop the one obtained via |
| 430 | * namei(), above. |
| 431 | */ |
| 432 | vrele(devvp); |
| 433 | |
| 434 | ump = VFSTOUFS(mp); |
| 435 | fs = ump->um_e2fs; |
| 436 | if (fs->e2fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { |
| 437 | /* |
| 438 | * Changing from r/w to r/o |
| 439 | */ |
| 440 | flags = WRITECLOSE; |
| 441 | if (mp->mnt_flag & MNT_FORCE) |
| 442 | flags |= FORCECLOSE; |
| 443 | error = ext2fs_flushfiles(mp, flags); |
| 444 | if (error == 0 && |
| 445 | ext2fs_cgupdate(ump, MNT_WAIT) == 0 && |
| 446 | (fs->e2fs.e2fs_state & E2FS_ERRORS) == 0) { |
| 447 | fs->e2fs.e2fs_state = E2FS_ISCLEAN; |
| 448 | (void) ext2fs_sbupdate(ump, MNT_WAIT); |
| 449 | } |
| 450 | if (error) |
| 451 | return error; |
| 452 | fs->e2fs_ronly = 1; |
| 453 | } |
| 454 | |
| 455 | if (mp->mnt_flag & MNT_RELOAD) { |
| 456 | error = ext2fs_reload(mp, l->l_cred, l); |
| 457 | if (error) |
| 458 | return error; |
| 459 | } |
| 460 | |
| 461 | if (fs->e2fs_ronly && (mp->mnt_iflag & IMNT_WANTRDWR)) { |
| 462 | /* |
| 463 | * Changing from read-only to read/write |
| 464 | */ |
| 465 | fs->e2fs_ronly = 0; |
| 466 | if (fs->e2fs.e2fs_state == E2FS_ISCLEAN) |
| 467 | fs->e2fs.e2fs_state = 0; |
| 468 | else |
| 469 | fs->e2fs.e2fs_state = E2FS_ERRORS; |
| 470 | fs->e2fs_fmod = 1; |
| 471 | } |
| 472 | if (args->fspec == NULL) |
| 473 | return 0; |
| 474 | } |
| 475 | |
| 476 | error = set_statvfs_info(path, UIO_USERSPACE, args->fspec, |
| 477 | UIO_USERSPACE, mp->mnt_op->vfs_name, mp, l); |
| 478 | if (error == 0) |
| 479 | ext2fs_sb_setmountinfo(fs, mp); |
| 480 | |
| 481 | if (fs->e2fs_fmod != 0) { /* XXX */ |
| 482 | fs->e2fs_fmod = 0; |
| 483 | if (fs->e2fs.e2fs_state == 0) |
| 484 | fs->e2fs.e2fs_wtime = time_second; |
| 485 | else |
| 486 | printf("%s: file system not clean; please fsck(8)\n" , |
| 487 | mp->mnt_stat.f_mntfromname); |
| 488 | (void) ext2fs_cgupdate(ump, MNT_WAIT); |
| 489 | } |
| 490 | return error; |
| 491 | |
| 492 | fail: |
| 493 | vrele(devvp); |
| 494 | return error; |
| 495 | } |
| 496 | |
| 497 | /* |
| 498 | * Sanity check the disk vnode content, and copy it over to inode structure. |
| 499 | */ |
| 500 | static int |
| 501 | ext2fs_loadvnode_content(struct m_ext2fs *fs, ino_t ino, struct buf *bp, struct inode *ip) |
| 502 | { |
| 503 | struct ext2fs_dinode *din; |
| 504 | int error = 0; |
| 505 | |
| 506 | din = (struct ext2fs_dinode *)((char *)bp->b_data + (ino_to_fsbo(fs, ino) * EXT2_DINODE_SIZE(fs))); |
| 507 | |
| 508 | /* sanity checks - inode data NOT byteswapped at this point */ |
| 509 | if (EXT2_DINODE_FITS(din, e2di_extra_isize, EXT2_DINODE_SIZE(fs)) |
| 510 | && (EXT2_DINODE_SIZE(fs) - EXT2_REV0_DINODE_SIZE) < fs2h16(din->e2di_extra_isize)) |
| 511 | { |
| 512 | printf("ext2fs: inode %" PRIu64" bad extra_isize %u" , |
| 513 | ino, din->e2di_extra_isize); |
| 514 | error = EINVAL; |
| 515 | goto bad; |
| 516 | } |
| 517 | |
| 518 | /* everything allright, proceed with copy */ |
| 519 | if (ip->i_din.e2fs_din == NULL) |
| 520 | ip->i_din.e2fs_din = kmem_alloc(EXT2_DINODE_SIZE(fs), KM_SLEEP); |
| 521 | |
| 522 | e2fs_iload(din, ip->i_din.e2fs_din, EXT2_DINODE_SIZE(fs)); |
| 523 | |
| 524 | ext2fs_set_inode_guid(ip); |
| 525 | |
| 526 | bad: |
| 527 | return error; |
| 528 | } |
| 529 | |
| 530 | /* |
| 531 | * Reload all incore data for a filesystem (used after running fsck on |
| 532 | * the root filesystem and finding things to fix). The filesystem must |
| 533 | * be mounted read-only. |
| 534 | * |
| 535 | * Things to do to update the mount: |
| 536 | * 1) invalidate all cached meta-data. |
| 537 | * 2) re-read superblock from disk. |
| 538 | * 3) re-read summary information from disk. |
| 539 | * 4) invalidate all inactive vnodes. |
| 540 | * 5) invalidate all cached file data. |
| 541 | * 6) re-read inode data for all active vnodes. |
| 542 | */ |
| 543 | int |
| 544 | ext2fs_reload(struct mount *mp, kauth_cred_t cred, struct lwp *l) |
| 545 | { |
| 546 | struct vnode *vp, *devvp; |
| 547 | struct inode *ip; |
| 548 | struct buf *bp; |
| 549 | struct m_ext2fs *fs; |
| 550 | struct ext2fs *newfs; |
| 551 | int i, error; |
| 552 | struct ufsmount *ump; |
| 553 | struct vnode_iterator *marker; |
| 554 | |
| 555 | if ((mp->mnt_flag & MNT_RDONLY) == 0) |
| 556 | return EINVAL; |
| 557 | |
| 558 | ump = VFSTOUFS(mp); |
| 559 | /* |
| 560 | * Step 1: invalidate all cached meta-data. |
| 561 | */ |
| 562 | devvp = ump->um_devvp; |
| 563 | vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); |
| 564 | error = vinvalbuf(devvp, 0, cred, l, 0, 0); |
| 565 | VOP_UNLOCK(devvp); |
| 566 | if (error) |
| 567 | panic("ext2fs_reload: dirty1" ); |
| 568 | |
| 569 | fs = ump->um_e2fs; |
| 570 | /* |
| 571 | * Step 2: re-read superblock from disk. Copy in new superblock, and compute |
| 572 | * in-memory values. |
| 573 | */ |
| 574 | error = bread(devvp, SBLOCK, SBSIZE, 0, &bp); |
| 575 | if (error) |
| 576 | return error; |
| 577 | newfs = (struct ext2fs *)bp->b_data; |
| 578 | e2fs_sbload(newfs, &fs->e2fs); |
| 579 | |
| 580 | brelse(bp, 0); |
| 581 | |
| 582 | error = ext2fs_sbfill(fs, (mp->mnt_flag & MNT_RDONLY) != 0); |
| 583 | if (error) |
| 584 | return error; |
| 585 | |
| 586 | /* |
| 587 | * Step 3: re-read summary information from disk. |
| 588 | */ |
| 589 | for (i = 0; i < fs->e2fs_ngdb; i++) { |
| 590 | error = bread(devvp , |
| 591 | EXT2_FSBTODB(fs, fs->e2fs.e2fs_first_dblock + |
| 592 | 1 /* superblock */ + i), |
| 593 | fs->e2fs_bsize, 0, &bp); |
| 594 | if (error) { |
| 595 | return error; |
| 596 | } |
| 597 | e2fs_cgload((struct ext2_gd *)bp->b_data, |
| 598 | &fs->e2fs_gd[i * fs->e2fs_bsize / sizeof(struct ext2_gd)], |
| 599 | fs->e2fs_bsize); |
| 600 | brelse(bp, 0); |
| 601 | } |
| 602 | |
| 603 | vfs_vnode_iterator_init(mp, &marker); |
| 604 | while ((vp = vfs_vnode_iterator_next(marker, NULL, NULL))) { |
| 605 | /* |
| 606 | * Step 4: invalidate all inactive vnodes. |
| 607 | */ |
| 608 | if (vrecycle(vp)) |
| 609 | continue; |
| 610 | /* |
| 611 | * Step 5: invalidate all cached file data. |
| 612 | */ |
| 613 | if (vn_lock(vp, LK_EXCLUSIVE)) { |
| 614 | vrele(vp); |
| 615 | continue; |
| 616 | } |
| 617 | if (vinvalbuf(vp, 0, cred, l, 0, 0)) |
| 618 | panic("ext2fs_reload: dirty2" ); |
| 619 | /* |
| 620 | * Step 6: re-read inode data for all active vnodes. |
| 621 | */ |
| 622 | ip = VTOI(vp); |
| 623 | error = bread(devvp, EXT2_FSBTODB(fs, ino_to_fsba(fs, ip->i_number)), |
| 624 | (int)fs->e2fs_bsize, 0, &bp); |
| 625 | if (error) { |
| 626 | vput(vp); |
| 627 | break; |
| 628 | } |
| 629 | error = ext2fs_loadvnode_content(fs, ip->i_number, bp, ip); |
| 630 | brelse(bp, 0); |
| 631 | if (error) { |
| 632 | vput(vp); |
| 633 | break; |
| 634 | } |
| 635 | |
| 636 | vput(vp); |
| 637 | } |
| 638 | vfs_vnode_iterator_destroy(marker); |
| 639 | return error; |
| 640 | } |
| 641 | |
| 642 | /* |
| 643 | * Common code for mount and mountroot |
| 644 | */ |
| 645 | int |
| 646 | ext2fs_mountfs(struct vnode *devvp, struct mount *mp) |
| 647 | { |
| 648 | struct lwp *l = curlwp; |
| 649 | struct ufsmount *ump; |
| 650 | struct buf *bp; |
| 651 | struct ext2fs *fs; |
| 652 | struct m_ext2fs *m_fs; |
| 653 | dev_t dev; |
| 654 | int error, i, ronly; |
| 655 | kauth_cred_t cred; |
| 656 | |
| 657 | dev = devvp->v_rdev; |
| 658 | cred = l->l_cred; |
| 659 | |
| 660 | /* Flush out any old buffers remaining from a previous use. */ |
| 661 | vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); |
| 662 | error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0); |
| 663 | VOP_UNLOCK(devvp); |
| 664 | if (error) |
| 665 | return error; |
| 666 | |
| 667 | ronly = (mp->mnt_flag & MNT_RDONLY) != 0; |
| 668 | |
| 669 | bp = NULL; |
| 670 | ump = NULL; |
| 671 | |
| 672 | /* Read the superblock from disk, and swap it directly. */ |
| 673 | error = bread(devvp, SBLOCK, SBSIZE, 0, &bp); |
| 674 | if (error) |
| 675 | goto out; |
| 676 | fs = (struct ext2fs *)bp->b_data; |
| 677 | m_fs = kmem_zalloc(sizeof(struct m_ext2fs), KM_SLEEP); |
| 678 | e2fs_sbload(fs, &m_fs->e2fs); |
| 679 | |
| 680 | brelse(bp, 0); |
| 681 | bp = NULL; |
| 682 | |
| 683 | /* Once swapped, validate and fill in the superblock. */ |
| 684 | error = ext2fs_sbfill(m_fs, ronly); |
| 685 | if (error) { |
| 686 | kmem_free(m_fs, sizeof(struct m_ext2fs)); |
| 687 | goto out; |
| 688 | } |
| 689 | m_fs->e2fs_ronly = ronly; |
| 690 | |
| 691 | ump = kmem_zalloc(sizeof(*ump), KM_SLEEP); |
| 692 | ump->um_fstype = UFS1; |
| 693 | ump->um_ops = &ext2fs_ufsops; |
| 694 | ump->um_e2fs = m_fs; |
| 695 | |
| 696 | if (ronly == 0) { |
| 697 | if (m_fs->e2fs.e2fs_state == E2FS_ISCLEAN) |
| 698 | m_fs->e2fs.e2fs_state = 0; |
| 699 | else |
| 700 | m_fs->e2fs.e2fs_state = E2FS_ERRORS; |
| 701 | m_fs->e2fs_fmod = 1; |
| 702 | } |
| 703 | |
| 704 | /* XXX: should be added in ext2fs_sbfill()? */ |
| 705 | m_fs->e2fs_gd = kmem_alloc(m_fs->e2fs_ngdb * m_fs->e2fs_bsize, KM_SLEEP); |
| 706 | for (i = 0; i < m_fs->e2fs_ngdb; i++) { |
| 707 | error = bread(devvp, |
| 708 | EXT2_FSBTODB(m_fs, m_fs->e2fs.e2fs_first_dblock + |
| 709 | 1 /* superblock */ + i), |
| 710 | m_fs->e2fs_bsize, 0, &bp); |
| 711 | if (error) { |
| 712 | kmem_free(m_fs->e2fs_gd, |
| 713 | m_fs->e2fs_ngdb * m_fs->e2fs_bsize); |
| 714 | goto out; |
| 715 | } |
| 716 | e2fs_cgload((struct ext2_gd *)bp->b_data, |
| 717 | &m_fs->e2fs_gd[ |
| 718 | i * m_fs->e2fs_bsize / sizeof(struct ext2_gd)], |
| 719 | m_fs->e2fs_bsize); |
| 720 | brelse(bp, 0); |
| 721 | bp = NULL; |
| 722 | } |
| 723 | |
| 724 | error = ext2fs_cg_verify_and_initialize(devvp, m_fs, ronly); |
| 725 | if (error) { |
| 726 | kmem_free(m_fs->e2fs_gd, m_fs->e2fs_ngdb * m_fs->e2fs_bsize); |
| 727 | goto out; |
| 728 | } |
| 729 | |
| 730 | mp->mnt_data = ump; |
| 731 | mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; |
| 732 | mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_EXT2FS); |
| 733 | mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; |
| 734 | mp->mnt_stat.f_namemax = EXT2FS_MAXNAMLEN; |
| 735 | mp->mnt_flag |= MNT_LOCAL; |
| 736 | mp->mnt_dev_bshift = DEV_BSHIFT; /* XXX */ |
| 737 | mp->mnt_fs_bshift = m_fs->e2fs_bshift; |
| 738 | mp->mnt_iflag |= IMNT_DTYPE; |
| 739 | ump->um_flags = 0; |
| 740 | ump->um_mountp = mp; |
| 741 | ump->um_dev = dev; |
| 742 | ump->um_devvp = devvp; |
| 743 | ump->um_nindir = EXT2_NINDIR(m_fs); |
| 744 | ump->um_lognindir = ffs(EXT2_NINDIR(m_fs)) - 1; |
| 745 | ump->um_bptrtodb = m_fs->e2fs_fsbtodb; |
| 746 | ump->um_seqinc = 1; /* no frags */ |
| 747 | ump->um_maxsymlinklen = EXT2_MAXSYMLINKLEN; |
| 748 | ump->um_dirblksiz = m_fs->e2fs_bsize; |
| 749 | ump->um_maxfilesize = ((uint64_t)0x80000000 * m_fs->e2fs_bsize - 1); |
| 750 | spec_node_setmountedfs(devvp, mp); |
| 751 | return 0; |
| 752 | |
| 753 | out: |
| 754 | if (bp != NULL) |
| 755 | brelse(bp, 0); |
| 756 | if (ump) { |
| 757 | kmem_free(ump->um_e2fs, sizeof(struct m_ext2fs)); |
| 758 | kmem_free(ump, sizeof(*ump)); |
| 759 | mp->mnt_data = NULL; |
| 760 | } |
| 761 | return error; |
| 762 | } |
| 763 | |
| 764 | /* |
| 765 | * unmount system call |
| 766 | */ |
| 767 | int |
| 768 | ext2fs_unmount(struct mount *mp, int mntflags) |
| 769 | { |
| 770 | struct ufsmount *ump; |
| 771 | struct m_ext2fs *fs; |
| 772 | int error, flags; |
| 773 | |
| 774 | flags = 0; |
| 775 | if (mntflags & MNT_FORCE) |
| 776 | flags |= FORCECLOSE; |
| 777 | if ((error = ext2fs_flushfiles(mp, flags)) != 0) |
| 778 | return error; |
| 779 | ump = VFSTOUFS(mp); |
| 780 | fs = ump->um_e2fs; |
| 781 | if (fs->e2fs_ronly == 0 && |
| 782 | ext2fs_cgupdate(ump, MNT_WAIT) == 0 && |
| 783 | (fs->e2fs.e2fs_state & E2FS_ERRORS) == 0) { |
| 784 | fs->e2fs.e2fs_state = E2FS_ISCLEAN; |
| 785 | (void) ext2fs_sbupdate(ump, MNT_WAIT); |
| 786 | } |
| 787 | if (ump->um_devvp->v_type != VBAD) |
| 788 | spec_node_setmountedfs(ump->um_devvp, NULL); |
| 789 | vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); |
| 790 | error = VOP_CLOSE(ump->um_devvp, fs->e2fs_ronly ? FREAD : FREAD|FWRITE, |
| 791 | NOCRED); |
| 792 | vput(ump->um_devvp); |
| 793 | kmem_free(fs->e2fs_gd, fs->e2fs_ngdb * fs->e2fs_bsize); |
| 794 | kmem_free(fs, sizeof(*fs)); |
| 795 | kmem_free(ump, sizeof(*ump)); |
| 796 | mp->mnt_data = NULL; |
| 797 | mp->mnt_flag &= ~MNT_LOCAL; |
| 798 | return error; |
| 799 | } |
| 800 | |
| 801 | /* |
| 802 | * Flush out all the files in a filesystem. |
| 803 | */ |
| 804 | int |
| 805 | ext2fs_flushfiles(struct mount *mp, int flags) |
| 806 | { |
| 807 | extern int doforce; |
| 808 | int error; |
| 809 | |
| 810 | if (!doforce) |
| 811 | flags &= ~FORCECLOSE; |
| 812 | error = vflush(mp, NULLVP, flags); |
| 813 | return error; |
| 814 | } |
| 815 | |
| 816 | /* |
| 817 | * Get file system statistics. |
| 818 | */ |
| 819 | int |
| 820 | ext2fs_statvfs(struct mount *mp, struct statvfs *sbp) |
| 821 | { |
| 822 | struct ufsmount *ump; |
| 823 | struct m_ext2fs *fs; |
| 824 | uint32_t overhead, overhead_per_group, ngdb; |
| 825 | int i, ngroups; |
| 826 | |
| 827 | ump = VFSTOUFS(mp); |
| 828 | fs = ump->um_e2fs; |
| 829 | if (fs->e2fs.e2fs_magic != E2FS_MAGIC) |
| 830 | panic("ext2fs_statvfs" ); |
| 831 | |
| 832 | /* |
| 833 | * Compute the overhead (FS structures) |
| 834 | */ |
| 835 | overhead_per_group = |
| 836 | 1 /* block bitmap */ + |
| 837 | 1 /* inode bitmap */ + |
| 838 | fs->e2fs_itpg; |
| 839 | overhead = fs->e2fs.e2fs_first_dblock + |
| 840 | fs->e2fs_ncg * overhead_per_group; |
| 841 | if (EXT2F_HAS_COMPAT_FEATURE(fs, EXT2F_COMPAT_SPARSESUPER2)) { |
| 842 | /* |
| 843 | * Superblock and group descriptions is in group zero, |
| 844 | * then optionally 0, 1 or 2 extra copies. |
| 845 | */ |
| 846 | ngroups = 1 |
| 847 | + (fs->e2fs.e4fs_backup_bgs[0] ? 1 : 0) |
| 848 | + (fs->e2fs.e4fs_backup_bgs[1] ? 1 : 0); |
| 849 | } else if (EXT2F_HAS_ROCOMPAT_FEATURE(fs, EXT2F_ROCOMPAT_SPARSESUPER)) { |
| 850 | for (i = 0, ngroups = 0; i < fs->e2fs_ncg; i++) { |
| 851 | if (cg_has_sb(i)) |
| 852 | ngroups++; |
| 853 | } |
| 854 | } else { |
| 855 | ngroups = fs->e2fs_ncg; |
| 856 | } |
| 857 | ngdb = fs->e2fs_ngdb; |
| 858 | if (EXT2F_HAS_COMPAT_FEATURE(fs, EXT2F_COMPAT_RESIZE)) |
| 859 | ngdb += fs->e2fs.e2fs_reserved_ngdb; |
| 860 | overhead += ngroups * (1 /* superblock */ + ngdb); |
| 861 | |
| 862 | sbp->f_bsize = fs->e2fs_bsize; |
| 863 | sbp->f_frsize = MINBSIZE << fs->e2fs.e2fs_fsize; |
| 864 | sbp->f_iosize = fs->e2fs_bsize; |
| 865 | sbp->f_blocks = fs->e2fs.e2fs_bcount - overhead; |
| 866 | sbp->f_bfree = fs->e2fs.e2fs_fbcount; |
| 867 | sbp->f_bresvd = fs->e2fs.e2fs_rbcount; |
| 868 | if (sbp->f_bfree > sbp->f_bresvd) |
| 869 | sbp->f_bavail = sbp->f_bfree - sbp->f_bresvd; |
| 870 | else |
| 871 | sbp->f_bavail = 0; |
| 872 | sbp->f_files = fs->e2fs.e2fs_icount; |
| 873 | sbp->f_ffree = fs->e2fs.e2fs_ficount; |
| 874 | sbp->f_favail = fs->e2fs.e2fs_ficount; |
| 875 | sbp->f_fresvd = 0; |
| 876 | copy_statvfs_info(sbp, mp); |
| 877 | return 0; |
| 878 | } |
| 879 | |
| 880 | static bool |
| 881 | ext2fs_sync_selector(void *cl, struct vnode *vp) |
| 882 | { |
| 883 | struct inode *ip; |
| 884 | |
| 885 | ip = VTOI(vp); |
| 886 | /* |
| 887 | * Skip the vnode/inode if inaccessible. |
| 888 | */ |
| 889 | if (ip == NULL || vp->v_type == VNON) |
| 890 | return false; |
| 891 | |
| 892 | if (((ip->i_flag & |
| 893 | (IN_CHANGE | IN_UPDATE | IN_MODIFIED)) == 0 && |
| 894 | LIST_EMPTY(&vp->v_dirtyblkhd) && |
| 895 | UVM_OBJ_IS_CLEAN(&vp->v_uobj))) |
| 896 | return false; |
| 897 | return true; |
| 898 | } |
| 899 | |
| 900 | /* |
| 901 | * Go through the disk queues to initiate sandbagged IO; |
| 902 | * go through the inodes to write those that have been modified; |
| 903 | * initiate the writing of the super block if it has been modified. |
| 904 | * |
| 905 | * Note: we are always called with the filesystem marked `MPBUSY'. |
| 906 | */ |
| 907 | int |
| 908 | ext2fs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) |
| 909 | { |
| 910 | struct vnode *vp; |
| 911 | struct ufsmount *ump = VFSTOUFS(mp); |
| 912 | struct m_ext2fs *fs; |
| 913 | struct vnode_iterator *marker; |
| 914 | int error, allerror = 0; |
| 915 | |
| 916 | fs = ump->um_e2fs; |
| 917 | if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ |
| 918 | printf("fs = %s\n" , fs->e2fs_fsmnt); |
| 919 | panic("update: rofs mod" ); |
| 920 | } |
| 921 | |
| 922 | /* |
| 923 | * Write back each (modified) inode. |
| 924 | */ |
| 925 | vfs_vnode_iterator_init(mp, &marker); |
| 926 | while ((vp = vfs_vnode_iterator_next(marker, ext2fs_sync_selector, |
| 927 | NULL))) |
| 928 | { |
| 929 | error = vn_lock(vp, LK_EXCLUSIVE); |
| 930 | if (error) { |
| 931 | vrele(vp); |
| 932 | continue; |
| 933 | } |
| 934 | if (vp->v_type == VREG && waitfor == MNT_LAZY) |
| 935 | error = ext2fs_update(vp, NULL, NULL, 0); |
| 936 | else |
| 937 | error = VOP_FSYNC(vp, cred, |
| 938 | waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0); |
| 939 | if (error) |
| 940 | allerror = error; |
| 941 | vput(vp); |
| 942 | } |
| 943 | vfs_vnode_iterator_destroy(marker); |
| 944 | /* |
| 945 | * Force stale file system control information to be flushed. |
| 946 | */ |
| 947 | if (waitfor != MNT_LAZY) { |
| 948 | vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); |
| 949 | if ((error = VOP_FSYNC(ump->um_devvp, cred, |
| 950 | waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) |
| 951 | allerror = error; |
| 952 | VOP_UNLOCK(ump->um_devvp); |
| 953 | } |
| 954 | /* |
| 955 | * Write back modified superblock. |
| 956 | */ |
| 957 | if (fs->e2fs_fmod != 0) { |
| 958 | fs->e2fs_fmod = 0; |
| 959 | fs->e2fs.e2fs_wtime = time_second; |
| 960 | if ((error = ext2fs_cgupdate(ump, waitfor))) |
| 961 | allerror = error; |
| 962 | } |
| 963 | return allerror; |
| 964 | } |
| 965 | |
| 966 | /* |
| 967 | * Read an inode from disk and initialize this vnode / inode pair. |
| 968 | * Caller assures no other thread will try to load this inode. |
| 969 | */ |
| 970 | int |
| 971 | ext2fs_loadvnode(struct mount *mp, struct vnode *vp, |
| 972 | const void *key, size_t key_len, const void **new_key) |
| 973 | { |
| 974 | ino_t ino; |
| 975 | struct m_ext2fs *fs; |
| 976 | struct inode *ip; |
| 977 | struct ufsmount *ump; |
| 978 | struct buf *bp; |
| 979 | dev_t dev; |
| 980 | int error; |
| 981 | |
| 982 | KASSERT(key_len == sizeof(ino)); |
| 983 | memcpy(&ino, key, key_len); |
| 984 | ump = VFSTOUFS(mp); |
| 985 | dev = ump->um_dev; |
| 986 | fs = ump->um_e2fs; |
| 987 | |
| 988 | /* Read in the disk contents for the inode, copy into the inode. */ |
| 989 | error = bread(ump->um_devvp, EXT2_FSBTODB(fs, ino_to_fsba(fs, ino)), |
| 990 | (int)fs->e2fs_bsize, 0, &bp); |
| 991 | if (error) |
| 992 | return error; |
| 993 | |
| 994 | /* Allocate and initialize inode. */ |
| 995 | ip = pool_get(&ext2fs_inode_pool, PR_WAITOK); |
| 996 | memset(ip, 0, sizeof(struct inode)); |
| 997 | vp->v_tag = VT_EXT2FS; |
| 998 | vp->v_op = ext2fs_vnodeop_p; |
| 999 | vp->v_vflag |= VV_LOCKSWORK; |
| 1000 | vp->v_data = ip; |
| 1001 | ip->i_vnode = vp; |
| 1002 | ip->i_ump = ump; |
| 1003 | ip->i_e2fs = fs; |
| 1004 | ip->i_dev = dev; |
| 1005 | ip->i_number = ino; |
| 1006 | ip->i_e2fs_last_lblk = 0; |
| 1007 | ip->i_e2fs_last_blk = 0; |
| 1008 | |
| 1009 | /* Initialize genfs node. */ |
| 1010 | genfs_node_init(vp, &ext2fs_genfsops); |
| 1011 | |
| 1012 | error = ext2fs_loadvnode_content(fs, ino, bp, ip); |
| 1013 | brelse(bp, 0); |
| 1014 | if (error) |
| 1015 | return error; |
| 1016 | |
| 1017 | /* If the inode was deleted, reset all fields */ |
| 1018 | if (ip->i_e2fs_dtime != 0) { |
| 1019 | ip->i_e2fs_mode = 0; |
| 1020 | (void)ext2fs_setsize(ip, 0); |
| 1021 | (void)ext2fs_setnblock(ip, 0); |
| 1022 | memset(ip->i_e2fs_blocks, 0, sizeof(ip->i_e2fs_blocks)); |
| 1023 | } |
| 1024 | |
| 1025 | /* Initialize the vnode from the inode. */ |
| 1026 | ext2fs_vinit(mp, ext2fs_specop_p, ext2fs_fifoop_p, &vp); |
| 1027 | |
| 1028 | /* Finish inode initialization. */ |
| 1029 | ip->i_devvp = ump->um_devvp; |
| 1030 | vref(ip->i_devvp); |
| 1031 | |
| 1032 | /* |
| 1033 | * Set up a generation number for this inode if it does not |
| 1034 | * already have one. This should only happen on old filesystems. |
| 1035 | */ |
| 1036 | |
| 1037 | if (ip->i_e2fs_gen == 0) { |
| 1038 | if (++ext2gennumber < (u_long)time_second) |
| 1039 | ext2gennumber = time_second; |
| 1040 | ip->i_e2fs_gen = ext2gennumber; |
| 1041 | if ((mp->mnt_flag & MNT_RDONLY) == 0) |
| 1042 | ip->i_flag |= IN_MODIFIED; |
| 1043 | } |
| 1044 | uvm_vnp_setsize(vp, ext2fs_size(ip)); |
| 1045 | *new_key = &ip->i_number; |
| 1046 | return 0; |
| 1047 | } |
| 1048 | |
| 1049 | /* |
| 1050 | * File handle to vnode |
| 1051 | * |
| 1052 | * Have to be really careful about stale file handles: |
| 1053 | * - check that the inode number is valid |
| 1054 | * - call ext2fs_vget() to get the locked inode |
| 1055 | * - check for an unallocated inode (i_mode == 0) |
| 1056 | */ |
| 1057 | int |
| 1058 | ext2fs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) |
| 1059 | { |
| 1060 | struct inode *ip; |
| 1061 | struct vnode *nvp; |
| 1062 | int error; |
| 1063 | struct ufid ufh; |
| 1064 | struct m_ext2fs *fs; |
| 1065 | |
| 1066 | if (fhp->fid_len != sizeof(struct ufid)) |
| 1067 | return EINVAL; |
| 1068 | |
| 1069 | memcpy(&ufh, fhp, sizeof(struct ufid)); |
| 1070 | fs = VFSTOUFS(mp)->um_e2fs; |
| 1071 | if ((ufh.ufid_ino < EXT2_FIRSTINO && ufh.ufid_ino != EXT2_ROOTINO) || |
| 1072 | ufh.ufid_ino >= fs->e2fs_ncg * fs->e2fs.e2fs_ipg) |
| 1073 | return ESTALE; |
| 1074 | |
| 1075 | if ((error = VFS_VGET(mp, ufh.ufid_ino, &nvp)) != 0) { |
| 1076 | *vpp = NULLVP; |
| 1077 | return error; |
| 1078 | } |
| 1079 | ip = VTOI(nvp); |
| 1080 | if (ip->i_e2fs_mode == 0 || ip->i_e2fs_dtime != 0 || |
| 1081 | ip->i_e2fs_gen != ufh.ufid_gen) { |
| 1082 | vput(nvp); |
| 1083 | *vpp = NULLVP; |
| 1084 | return ESTALE; |
| 1085 | } |
| 1086 | *vpp = nvp; |
| 1087 | return 0; |
| 1088 | } |
| 1089 | |
| 1090 | /* |
| 1091 | * Vnode pointer to File handle |
| 1092 | */ |
| 1093 | /* ARGSUSED */ |
| 1094 | int |
| 1095 | ext2fs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) |
| 1096 | { |
| 1097 | struct inode *ip; |
| 1098 | struct ufid ufh; |
| 1099 | |
| 1100 | if (*fh_size < sizeof(struct ufid)) { |
| 1101 | *fh_size = sizeof(struct ufid); |
| 1102 | return E2BIG; |
| 1103 | } |
| 1104 | *fh_size = sizeof(struct ufid); |
| 1105 | |
| 1106 | ip = VTOI(vp); |
| 1107 | memset(&ufh, 0, sizeof(ufh)); |
| 1108 | ufh.ufid_len = sizeof(struct ufid); |
| 1109 | ufh.ufid_ino = ip->i_number; |
| 1110 | ufh.ufid_gen = ip->i_e2fs_gen; |
| 1111 | memcpy(fhp, &ufh, sizeof(ufh)); |
| 1112 | return 0; |
| 1113 | } |
| 1114 | |
| 1115 | /* |
| 1116 | * Write a superblock and associated information back to disk. |
| 1117 | */ |
| 1118 | int |
| 1119 | ext2fs_sbupdate(struct ufsmount *mp, int waitfor) |
| 1120 | { |
| 1121 | struct m_ext2fs *fs = mp->um_e2fs; |
| 1122 | struct buf *bp; |
| 1123 | int error = 0; |
| 1124 | |
| 1125 | bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0); |
| 1126 | e2fs_sbsave(&fs->e2fs, (struct ext2fs*)bp->b_data); |
| 1127 | if (waitfor == MNT_WAIT) |
| 1128 | error = bwrite(bp); |
| 1129 | else |
| 1130 | bawrite(bp); |
| 1131 | return error; |
| 1132 | } |
| 1133 | |
| 1134 | int |
| 1135 | ext2fs_cgupdate(struct ufsmount *mp, int waitfor) |
| 1136 | { |
| 1137 | struct m_ext2fs *fs = mp->um_e2fs; |
| 1138 | struct buf *bp; |
| 1139 | int i, error = 0, allerror = 0; |
| 1140 | |
| 1141 | allerror = ext2fs_sbupdate(mp, waitfor); |
| 1142 | for (i = 0; i < fs->e2fs_ngdb; i++) { |
| 1143 | bp = getblk(mp->um_devvp, EXT2_FSBTODB(fs, |
| 1144 | fs->e2fs.e2fs_first_dblock + |
| 1145 | 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0); |
| 1146 | e2fs_cgsave(&fs->e2fs_gd[ |
| 1147 | i * fs->e2fs_bsize / sizeof(struct ext2_gd)], |
| 1148 | (struct ext2_gd *)bp->b_data, fs->e2fs_bsize); |
| 1149 | if (waitfor == MNT_WAIT) |
| 1150 | error = bwrite(bp); |
| 1151 | else |
| 1152 | bawrite(bp); |
| 1153 | } |
| 1154 | |
| 1155 | if (!allerror && error) |
| 1156 | allerror = error; |
| 1157 | return allerror; |
| 1158 | } |
| 1159 | |
| 1160 | /* |
| 1161 | * Fill in the m_fs structure, and validate the fields of the superblock. |
| 1162 | * NOTE: here, the superblock is already swapped. |
| 1163 | */ |
| 1164 | static int |
| 1165 | ext2fs_sbfill(struct m_ext2fs *m_fs, int ronly) |
| 1166 | { |
| 1167 | uint32_t u32; |
| 1168 | struct ext2fs *fs = &m_fs->e2fs; |
| 1169 | |
| 1170 | /* |
| 1171 | * General sanity checks |
| 1172 | */ |
| 1173 | if (fs->e2fs_magic != E2FS_MAGIC) |
| 1174 | return EINVAL; |
| 1175 | if (fs->e2fs_rev > E2FS_REV1) { |
| 1176 | printf("ext2fs: unsupported revision number: %x\n" , fs->e2fs_rev); |
| 1177 | return EINVAL; |
| 1178 | } |
| 1179 | if (fs->e2fs_log_bsize > 2) { |
| 1180 | /* block size = 1024|2048|4096 */ |
| 1181 | printf("ext2fs: bad block size: %d\n" , fs->e2fs_log_bsize); |
| 1182 | return EINVAL; |
| 1183 | } |
| 1184 | if (fs->e2fs_bpg == 0) { |
| 1185 | printf("ext2fs: zero blocks per group\n" ); |
| 1186 | return EINVAL; |
| 1187 | } |
| 1188 | if (fs->e2fs_ipg == 0) { |
| 1189 | printf("ext2fs: zero inodes per group\n" ); |
| 1190 | return EINVAL; |
| 1191 | } |
| 1192 | |
| 1193 | if (fs->e2fs_first_dblock >= fs->e2fs_bcount) { |
| 1194 | printf("ext2fs: invalid first data block\n" ); |
| 1195 | return EINVAL; |
| 1196 | } |
| 1197 | if (fs->e2fs_rbcount > fs->e2fs_bcount || |
| 1198 | fs->e2fs_fbcount > fs->e2fs_bcount) { |
| 1199 | printf("ext2fs: invalid block count\n" ); |
| 1200 | return EINVAL; |
| 1201 | } |
| 1202 | |
| 1203 | /* |
| 1204 | * Compute the fields of the superblock |
| 1205 | */ |
| 1206 | u32 = fs->e2fs_bcount - fs->e2fs_first_dblock; /* > 0 */ |
| 1207 | m_fs->e2fs_ncg = howmany(u32, fs->e2fs_bpg); |
| 1208 | if (m_fs->e2fs_ncg == 0) { |
| 1209 | printf("ext2fs: invalid number of cylinder groups\n" ); |
| 1210 | return EINVAL; |
| 1211 | } |
| 1212 | |
| 1213 | m_fs->e2fs_fsbtodb = fs->e2fs_log_bsize + LOG_MINBSIZE - DEV_BSHIFT; |
| 1214 | m_fs->e2fs_bsize = MINBSIZE << fs->e2fs_log_bsize; |
| 1215 | m_fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs_log_bsize; |
| 1216 | m_fs->e2fs_qbmask = m_fs->e2fs_bsize - 1; |
| 1217 | m_fs->e2fs_bmask = ~m_fs->e2fs_qbmask; |
| 1218 | |
| 1219 | if ((u32 = m_fs->e2fs_bsize / sizeof(struct ext2_gd)) == 0) { |
| 1220 | /* Unlikely to happen */ |
| 1221 | printf("ext2fs: invalid block size\n" ); |
| 1222 | return EINVAL; |
| 1223 | } |
| 1224 | m_fs->e2fs_ngdb = howmany(m_fs->e2fs_ncg, u32); |
| 1225 | if (m_fs->e2fs_ngdb == 0) { |
| 1226 | printf("ext2fs: invalid number of group descriptor blocks\n" ); |
| 1227 | return EINVAL; |
| 1228 | } |
| 1229 | |
| 1230 | if (m_fs->e2fs_bsize < EXT2_DINODE_SIZE(m_fs)) { |
| 1231 | printf("ext2fs: invalid inode size\n" ); |
| 1232 | return EINVAL; |
| 1233 | } |
| 1234 | m_fs->e2fs_ipb = m_fs->e2fs_bsize / EXT2_DINODE_SIZE(m_fs); |
| 1235 | |
| 1236 | m_fs->e2fs_itpg = fs->e2fs_ipg / m_fs->e2fs_ipb; |
| 1237 | |
| 1238 | /* |
| 1239 | * Revision-specific checks |
| 1240 | */ |
| 1241 | if (fs->e2fs_rev > E2FS_REV0) { |
| 1242 | char buf[256]; |
| 1243 | if (fs->e2fs_first_ino != EXT2_FIRSTINO) { |
| 1244 | printf("ext2fs: unsupported first inode position\n" ); |
| 1245 | return EINVAL; |
| 1246 | } |
| 1247 | u32 = fs->e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP; |
| 1248 | if (u32) { |
| 1249 | snprintb(buf, sizeof(buf), EXT2F_INCOMPAT_BITS, u32); |
| 1250 | printf("ext2fs: unsupported incompat features: %s\n" , buf); |
| 1251 | #ifndef EXT2_IGNORE_INCOMPAT_FEATURES |
| 1252 | return EINVAL; |
| 1253 | #endif |
| 1254 | } |
| 1255 | u32 = fs->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP; |
| 1256 | if (!ronly && u32) { |
| 1257 | snprintb(buf, sizeof(buf), EXT2F_ROCOMPAT_BITS, u32); |
| 1258 | printf("ext2fs: unsupported ro-incompat features: %s\n" , |
| 1259 | buf); |
| 1260 | #ifndef EXT2_IGNORE_ROCOMPAT_FEATURES |
| 1261 | return EROFS; |
| 1262 | #endif |
| 1263 | } |
| 1264 | if (fs->e2fs_inode_size == 0 || !powerof2(fs->e2fs_inode_size) || fs->e2fs_inode_size > m_fs->e2fs_bsize) { |
| 1265 | printf("ext2fs: bad inode size\n" ); |
| 1266 | return EINVAL; |
| 1267 | } |
| 1268 | } |
| 1269 | |
| 1270 | return 0; |
| 1271 | } |
| 1272 | |