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 | |