1 /*-
2 * modified for EXT2FS support in Lites 1.1
3 *
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
6 */
7 /*-
8 * SPDX-License-Identifier: BSD-3-Clause
9 *
10 * Copyright (c) 1989, 1991, 1993, 1994
11 * The Regents of the University of California. All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/namei.h>
41 #include <sys/priv.h>
42 #include <sys/proc.h>
43 #include <sys/kernel.h>
44 #include <sys/vnode.h>
45 #include <sys/mount.h>
46 #include <sys/bio.h>
47 #include <sys/buf.h>
48 #include <sys/conf.h>
49 #include <sys/endian.h>
50 #include <sys/fcntl.h>
51 #include <sys/malloc.h>
52 #include <sys/sdt.h>
53 #include <sys/stat.h>
54 #include <sys/mutex.h>
55
56 #include <geom/geom.h>
57 #include <geom/geom_vfs.h>
58
59 #include <fs/ext2fs/fs.h>
60 #include <fs/ext2fs/ext2_mount.h>
61 #include <fs/ext2fs/inode.h>
62
63 #include <fs/ext2fs/ext2fs.h>
64 #include <fs/ext2fs/ext2_dinode.h>
65 #include <fs/ext2fs/ext2_extern.h>
66 #include <fs/ext2fs/ext2_extents.h>
67
68 SDT_PROVIDER_DECLARE(ext2fs);
69 /*
70 * ext2fs trace probe:
71 * arg0: verbosity. Higher numbers give more verbose messages
72 * arg1: Textual message
73 */
74 SDT_PROBE_DEFINE2(ext2fs, , vfsops, trace, "int", "char*");
75 SDT_PROBE_DEFINE2(ext2fs, , vfsops, ext2_cg_validate_error, "char*", "int");
76 SDT_PROBE_DEFINE1(ext2fs, , vfsops, ext2_compute_sb_data_error, "char*");
77
78 static int ext2_flushfiles(struct mount *mp, int flags, struct thread *td);
79 static int ext2_mountfs(struct vnode *, struct mount *);
80 static int ext2_reload(struct mount *mp, struct thread *td);
81 static int ext2_sbupdate(struct ext2mount *, int);
82 static int ext2_cgupdate(struct ext2mount *, int);
83 static vfs_unmount_t ext2_unmount;
84 static vfs_root_t ext2_root;
85 static vfs_statfs_t ext2_statfs;
86 static vfs_sync_t ext2_sync;
87 static vfs_vget_t ext2_vget;
88 static vfs_fhtovp_t ext2_fhtovp;
89 static vfs_mount_t ext2_mount;
90
91 MALLOC_DEFINE(M_EXT2NODE, "ext2_node", "EXT2 vnode private part");
92 static MALLOC_DEFINE(M_EXT2MNT, "ext2_mount", "EXT2 mount structure");
93
94 static struct vfsops ext2fs_vfsops = {
95 .vfs_fhtovp = ext2_fhtovp,
96 .vfs_mount = ext2_mount,
97 .vfs_root = ext2_root, /* root inode via vget */
98 .vfs_statfs = ext2_statfs,
99 .vfs_sync = ext2_sync,
100 .vfs_unmount = ext2_unmount,
101 .vfs_vget = ext2_vget,
102 };
103
104 VFS_SET(ext2fs_vfsops, ext2fs, 0);
105
106 static int ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev,
107 int ronly);
108 static int ext2_compute_sb_data(struct vnode * devvp,
109 struct ext2fs * es, struct m_ext2fs * fs);
110
111 static const char *ext2_opts[] = { "acls", "async", "noatime", "noclusterr",
112 "noclusterw", "noexec", "export", "force", "from", "multilabel",
113 "suiddir", "nosymfollow", "sync", "union", NULL };
114
115 /*
116 * VFS Operations.
117 *
118 * mount system call
119 */
120 static int
ext2_mount(struct mount * mp)121 ext2_mount(struct mount *mp)
122 {
123 struct vfsoptlist *opts;
124 struct vnode *devvp;
125 struct thread *td;
126 struct ext2mount *ump = NULL;
127 struct m_ext2fs *fs;
128 struct nameidata nd, *ndp = &nd;
129 accmode_t accmode;
130 char *path, *fspec;
131 int error, flags, len;
132
133 td = curthread;
134 opts = mp->mnt_optnew;
135
136 if (vfs_filteropt(opts, ext2_opts))
137 return (EINVAL);
138
139 vfs_getopt(opts, "fspath", (void **)&path, NULL);
140 /* Double-check the length of path.. */
141 if (strlen(path) >= MAXMNTLEN)
142 return (ENAMETOOLONG);
143
144 fspec = NULL;
145 error = vfs_getopt(opts, "from", (void **)&fspec, &len);
146 if (!error && fspec[len - 1] != '\0')
147 return (EINVAL);
148
149 /*
150 * If updating, check whether changing from read-only to
151 * read/write; if there is no device name, that's all we do.
152 */
153 if (mp->mnt_flag & MNT_UPDATE) {
154 ump = VFSTOEXT2(mp);
155 fs = ump->um_e2fs;
156 error = 0;
157 if (fs->e2fs_ronly == 0 &&
158 vfs_flagopt(opts, "ro", NULL, 0)) {
159 error = VFS_SYNC(mp, MNT_WAIT);
160 if (error)
161 return (error);
162 flags = WRITECLOSE;
163 if (mp->mnt_flag & MNT_FORCE)
164 flags |= FORCECLOSE;
165 error = ext2_flushfiles(mp, flags, td);
166 if (error == 0 && fs->e2fs_wasvalid &&
167 ext2_cgupdate(ump, MNT_WAIT) == 0) {
168 fs->e2fs->e2fs_state =
169 htole16((le16toh(fs->e2fs->e2fs_state) |
170 E2FS_ISCLEAN));
171 ext2_sbupdate(ump, MNT_WAIT);
172 }
173 fs->e2fs_ronly = 1;
174 vfs_flagopt(opts, "ro", &mp->mnt_flag, MNT_RDONLY);
175 g_topology_lock();
176 g_access(ump->um_cp, 0, -1, 0);
177 g_topology_unlock();
178 }
179 if (!error && (mp->mnt_flag & MNT_RELOAD))
180 error = ext2_reload(mp, td);
181 if (error)
182 return (error);
183 devvp = ump->um_devvp;
184 if (fs->e2fs_ronly && !vfs_flagopt(opts, "ro", NULL, 0)) {
185 if (ext2_check_sb_compat(fs->e2fs, devvp->v_rdev, 0))
186 return (EPERM);
187
188 /*
189 * If upgrade to read-write by non-root, then verify
190 * that user has necessary permissions on the device.
191 */
192 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
193 error = VOP_ACCESS(devvp, VREAD | VWRITE,
194 td->td_ucred, td);
195 if (error)
196 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
197 if (error) {
198 VOP_UNLOCK(devvp);
199 return (error);
200 }
201 VOP_UNLOCK(devvp);
202 g_topology_lock();
203 error = g_access(ump->um_cp, 0, 1, 0);
204 g_topology_unlock();
205 if (error)
206 return (error);
207
208 if ((le16toh(fs->e2fs->e2fs_state) & E2FS_ISCLEAN) == 0 ||
209 (le16toh(fs->e2fs->e2fs_state) & E2FS_ERRORS)) {
210 if (mp->mnt_flag & MNT_FORCE) {
211 printf(
212 "WARNING: %s was not properly dismounted\n", fs->e2fs_fsmnt);
213 } else {
214 printf(
215 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
216 fs->e2fs_fsmnt);
217 return (EPERM);
218 }
219 }
220 fs->e2fs->e2fs_state =
221 htole16(le16toh(fs->e2fs->e2fs_state) & ~E2FS_ISCLEAN);
222 (void)ext2_cgupdate(ump, MNT_WAIT);
223 fs->e2fs_ronly = 0;
224 MNT_ILOCK(mp);
225 mp->mnt_flag &= ~MNT_RDONLY;
226 MNT_IUNLOCK(mp);
227 }
228 if (vfs_flagopt(opts, "export", NULL, 0)) {
229 /* Process export requests in vfs_mount.c. */
230 return (error);
231 }
232 }
233
234 /*
235 * Not an update, or updating the name: look up the name
236 * and verify that it refers to a sensible disk device.
237 */
238 if (fspec == NULL)
239 return (EINVAL);
240 NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec);
241 if ((error = namei(ndp)) != 0)
242 return (error);
243 NDFREE_PNBUF(ndp);
244 devvp = ndp->ni_vp;
245
246 if (!vn_isdisk_error(devvp, &error)) {
247 vput(devvp);
248 return (error);
249 }
250
251 /*
252 * If mount by non-root, then verify that user has necessary
253 * permissions on the device.
254 *
255 * XXXRW: VOP_ACCESS() enough?
256 */
257 accmode = VREAD;
258 if ((mp->mnt_flag & MNT_RDONLY) == 0)
259 accmode |= VWRITE;
260 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td);
261 if (error)
262 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
263 if (error) {
264 vput(devvp);
265 return (error);
266 }
267
268 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
269 error = ext2_mountfs(devvp, mp);
270 } else {
271 if (devvp != ump->um_devvp) {
272 vput(devvp);
273 return (EINVAL); /* needs translation */
274 } else
275 vput(devvp);
276 }
277 if (error) {
278 vrele(devvp);
279 return (error);
280 }
281 ump = VFSTOEXT2(mp);
282 fs = ump->um_e2fs;
283
284 /*
285 * Note that this strncpy() is ok because of a check at the start
286 * of ext2_mount().
287 */
288 strncpy(fs->e2fs_fsmnt, path, MAXMNTLEN);
289 fs->e2fs_fsmnt[MAXMNTLEN - 1] = '\0';
290 vfs_mountedfrom(mp, fspec);
291 return (0);
292 }
293
294 static int
ext2_check_sb_compat(struct ext2fs * es,struct cdev * dev,int ronly)295 ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, int ronly)
296 {
297 uint32_t i, mask;
298
299 if (le16toh(es->e2fs_magic) != E2FS_MAGIC) {
300 printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n",
301 devtoname(dev), le16toh(es->e2fs_magic), E2FS_MAGIC);
302 return (1);
303 }
304 if (le32toh(es->e2fs_rev) > E2FS_REV0) {
305 mask = le32toh(es->e2fs_features_incompat) & ~(EXT2F_INCOMPAT_SUPP);
306 if (mask) {
307 printf("WARNING: mount of %s denied due to "
308 "unsupported optional features:\n", devtoname(dev));
309 for (i = 0;
310 i < sizeof(incompat)/sizeof(struct ext2_feature);
311 i++)
312 if (mask & incompat[i].mask)
313 printf("%s ", incompat[i].name);
314 printf("\n");
315 return (1);
316 }
317 mask = le32toh(es->e2fs_features_rocompat) & ~EXT2F_ROCOMPAT_SUPP;
318 if (!ronly && mask) {
319 printf("WARNING: R/W mount of %s denied due to "
320 "unsupported optional features:\n", devtoname(dev));
321 for (i = 0;
322 i < sizeof(ro_compat)/sizeof(struct ext2_feature);
323 i++)
324 if (mask & ro_compat[i].mask)
325 printf("%s ", ro_compat[i].name);
326 printf("\n");
327 return (1);
328 }
329 }
330 return (0);
331 }
332
333 static e4fs_daddr_t
ext2_cg_location(struct m_ext2fs * fs,int number)334 ext2_cg_location(struct m_ext2fs *fs, int number)
335 {
336 int cg, descpb, logical_sb, has_super = 0;
337
338 /*
339 * Adjust logical superblock block number.
340 * Godmar thinks: if the blocksize is greater than 1024, then
341 * the superblock is logically part of block zero.
342 */
343 logical_sb = fs->e2fs_bsize > SBLOCKSIZE ? 0 : 1;
344
345 if (!EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_META_BG) ||
346 number < le32toh(fs->e2fs->e3fs_first_meta_bg))
347 return (logical_sb + number + 1);
348
349 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT))
350 descpb = fs->e2fs_bsize / sizeof(struct ext2_gd);
351 else
352 descpb = fs->e2fs_bsize / E2FS_REV0_GD_SIZE;
353
354 cg = descpb * number;
355
356 if (ext2_cg_has_sb(fs, cg))
357 has_super = 1;
358
359 return (has_super + cg * (e4fs_daddr_t)EXT2_BLOCKS_PER_GROUP(fs) +
360 le32toh(fs->e2fs->e2fs_first_dblock));
361 }
362
363 static int
ext2_cg_validate(struct m_ext2fs * fs)364 ext2_cg_validate(struct m_ext2fs *fs)
365 {
366 uint64_t b_bitmap;
367 uint64_t i_bitmap;
368 uint64_t i_tables;
369 uint64_t first_block, last_block, last_cg_block;
370 struct ext2_gd *gd;
371 unsigned int i, cg_count;
372
373 first_block = le32toh(fs->e2fs->e2fs_first_dblock);
374 last_cg_block = ext2_cg_number_gdb(fs, 0);
375 cg_count = fs->e2fs_gcount;
376
377 for (i = 0; i < fs->e2fs_gcount; i++) {
378 gd = &fs->e2fs_gd[i];
379
380 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_FLEX_BG) ||
381 i == fs->e2fs_gcount - 1) {
382 last_block = fs->e2fs_bcount - 1;
383 } else {
384 last_block = first_block +
385 (EXT2_BLOCKS_PER_GROUP(fs) - 1);
386 }
387
388 if ((cg_count == fs->e2fs_gcount) &&
389 !(le16toh(gd->ext4bgd_flags) & EXT2_BG_INODE_ZEROED))
390 cg_count = i;
391
392 b_bitmap = e2fs_gd_get_b_bitmap(gd);
393 if (b_bitmap == 0) {
394 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
395 "block bitmap is zero", i);
396 return (EINVAL);
397 }
398 if (b_bitmap <= last_cg_block) {
399 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
400 "block bitmap overlaps gds", i);
401 return (EINVAL);
402 }
403 if (b_bitmap < first_block || b_bitmap > last_block) {
404 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
405 "block bitmap not in group", i);
406 return (EINVAL);
407 }
408
409 i_bitmap = e2fs_gd_get_i_bitmap(gd);
410 if (i_bitmap == 0) {
411 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
412 "inode bitmap is zero", i);
413 return (EINVAL);
414 }
415 if (i_bitmap <= last_cg_block) {
416 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
417 "inode bitmap overlaps gds", i);
418 return (EINVAL);
419 }
420 if (i_bitmap < first_block || i_bitmap > last_block) {
421 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
422 "inode bitmap not in group blk", i);
423 return (EINVAL);
424 }
425
426 i_tables = e2fs_gd_get_i_tables(gd);
427 if (i_tables == 0) {
428 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
429 "inode table is zero", i);
430 return (EINVAL);
431 }
432 if (i_tables <= last_cg_block) {
433 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
434 "inode tables overlaps gds", i);
435 return (EINVAL);
436 }
437 if (i_tables < first_block ||
438 i_tables + fs->e2fs_itpg - 1 > last_block) {
439 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
440 "inode tables not in group blk", i);
441 return (EINVAL);
442 }
443
444 if (!EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_FLEX_BG))
445 first_block += EXT2_BLOCKS_PER_GROUP(fs);
446 }
447
448 return (0);
449 }
450
451 /*
452 * This computes the fields of the m_ext2fs structure from the
453 * data in the ext2fs structure read in.
454 */
455 static int
ext2_compute_sb_data(struct vnode * devvp,struct ext2fs * es,struct m_ext2fs * fs)456 ext2_compute_sb_data(struct vnode *devvp, struct ext2fs *es,
457 struct m_ext2fs *fs)
458 {
459 struct buf *bp;
460 uint32_t e2fs_descpb, e2fs_gdbcount_alloc;
461 int i, j;
462 int g_count = 0;
463 int error;
464
465 /* Check checksum features */
466 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) &&
467 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) {
468 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
469 "incorrect checksum features combination");
470 return (EINVAL);
471 }
472
473 /* Precompute checksum seed for all metadata */
474 ext2_sb_csum_set_seed(fs);
475
476 /* Verify sb csum if possible */
477 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) {
478 error = ext2_sb_csum_verify(fs);
479 if (error) {
480 return (error);
481 }
482 }
483
484 /* Check for block size = 1K|2K|4K */
485 if (le32toh(es->e2fs_log_bsize) > 2) {
486 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
487 "bad block size");
488 return (EINVAL);
489 }
490
491 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + le32toh(es->e2fs_log_bsize);
492 fs->e2fs_bsize = 1U << fs->e2fs_bshift;
493 fs->e2fs_fsbtodb = le32toh(es->e2fs_log_bsize) + 1;
494 fs->e2fs_qbmask = fs->e2fs_bsize - 1;
495
496 /* Check for fragment size */
497 if (le32toh(es->e2fs_log_fsize) >
498 (EXT2_MAX_FRAG_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE)) {
499 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
500 "invalid log cluster size");
501 return (EINVAL);
502 }
503
504 fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << le32toh(es->e2fs_log_fsize);
505 if (fs->e2fs_fsize != fs->e2fs_bsize) {
506 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
507 "fragment size != block size");
508 return (EINVAL);
509 }
510
511 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize;
512
513 /* Check reserved gdt blocks for future filesystem expansion */
514 if (le16toh(es->e2fs_reserved_ngdb) > (fs->e2fs_bsize / 4)) {
515 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
516 "number of reserved GDT blocks too large");
517 return (EINVAL);
518 }
519
520 if (le32toh(es->e2fs_rev) == E2FS_REV0) {
521 fs->e2fs_isize = E2FS_REV0_INODE_SIZE;
522 } else {
523 fs->e2fs_isize = le16toh(es->e2fs_inode_size);
524
525 /*
526 * Check first ino.
527 */
528 if (le32toh(es->e2fs_first_ino) < EXT2_FIRSTINO) {
529 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
530 "invalid first ino");
531 return (EINVAL);
532 }
533
534 /*
535 * Simple sanity check for superblock inode size value.
536 */
537 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE ||
538 EXT2_INODE_SIZE(fs) > fs->e2fs_bsize ||
539 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) {
540 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
541 "invalid inode size");
542 return (EINVAL);
543 }
544 }
545
546 /* Check group descriptors */
547 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT) &&
548 le16toh(es->e3fs_desc_size) != E2FS_64BIT_GD_SIZE) {
549 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
550 "unsupported 64bit descriptor size");
551 return (EINVAL);
552 }
553
554 fs->e2fs_bpg = le32toh(es->e2fs_bpg);
555 fs->e2fs_fpg = le32toh(es->e2fs_fpg);
556 if (fs->e2fs_bpg == 0 || fs->e2fs_fpg == 0) {
557 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
558 "zero blocks/fragments per group");
559 return (EINVAL);
560 } else if (fs->e2fs_bpg != fs->e2fs_fpg) {
561 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
562 "blocks per group not equal fragments per group");
563 return (EINVAL);
564 }
565
566 if (fs->e2fs_bpg != fs->e2fs_bsize * 8) {
567 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
568 "non-standard group size unsupported");
569 return (EINVAL);
570 }
571
572 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs);
573 if (fs->e2fs_ipb == 0 ||
574 fs->e2fs_ipb > fs->e2fs_bsize / E2FS_REV0_INODE_SIZE) {
575 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
576 "bad inodes per block size");
577 return (EINVAL);
578 }
579
580 fs->e2fs_ipg = le32toh(es->e2fs_ipg);
581 if (fs->e2fs_ipg < fs->e2fs_ipb || fs->e2fs_ipg > fs->e2fs_bsize * 8) {
582 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
583 "invalid inodes per group");
584 return (EINVAL);
585 }
586
587 fs->e2fs_itpg = fs->e2fs_ipg / fs->e2fs_ipb;
588
589 fs->e2fs_bcount = le32toh(es->e2fs_bcount);
590 fs->e2fs_rbcount = le32toh(es->e2fs_rbcount);
591 fs->e2fs_fbcount = le32toh(es->e2fs_fbcount);
592 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) {
593 fs->e2fs_bcount |= (uint64_t)(le32toh(es->e4fs_bcount_hi)) << 32;
594 fs->e2fs_rbcount |= (uint64_t)(le32toh(es->e4fs_rbcount_hi)) << 32;
595 fs->e2fs_fbcount |= (uint64_t)(le32toh(es->e4fs_fbcount_hi)) << 32;
596 }
597 if (fs->e2fs_rbcount > fs->e2fs_bcount ||
598 fs->e2fs_fbcount > fs->e2fs_bcount) {
599 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
600 "invalid block count");
601 return (EINVAL);
602 }
603
604 fs->e2fs_ficount = le32toh(es->e2fs_ficount);
605 if (fs->e2fs_ficount > le32toh(es->e2fs_icount)) {
606 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
607 "invalid number of free inodes");
608 return (EINVAL);
609 }
610
611 if (le32toh(es->e2fs_first_dblock) != (fs->e2fs_bsize > 1024 ? 0 : 1) ||
612 le32toh(es->e2fs_first_dblock) >= fs->e2fs_bcount) {
613 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
614 "first data block out of range");
615 return (EINVAL);
616 }
617
618 fs->e2fs_gcount = howmany(fs->e2fs_bcount -
619 le32toh(es->e2fs_first_dblock), EXT2_BLOCKS_PER_GROUP(fs));
620 if (fs->e2fs_gcount > ((uint64_t)1 << 32) - EXT2_DESCS_PER_BLOCK(fs)) {
621 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
622 "groups count too large");
623 return (EINVAL);
624 }
625
626 /* Check for extra isize in big inodes. */
627 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) &&
628 EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) {
629 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
630 "no space for extra inode timestamps");
631 return (EINVAL);
632 }
633
634 /* s_resuid / s_resgid ? */
635
636 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) {
637 e2fs_descpb = fs->e2fs_bsize / E2FS_64BIT_GD_SIZE;
638 e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount, e2fs_descpb);
639 } else {
640 e2fs_descpb = fs->e2fs_bsize / E2FS_REV0_GD_SIZE;
641 e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount,
642 fs->e2fs_bsize / sizeof(struct ext2_gd));
643 }
644 fs->e2fs_gdbcount = howmany(fs->e2fs_gcount, e2fs_descpb);
645 fs->e2fs_gd = malloc(e2fs_gdbcount_alloc * fs->e2fs_bsize,
646 M_EXT2MNT, M_WAITOK | M_ZERO);
647 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount *
648 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK | M_ZERO);
649
650 for (i = 0; i < fs->e2fs_gdbcount; i++) {
651 error = bread(devvp,
652 fsbtodb(fs, ext2_cg_location(fs, i)),
653 fs->e2fs_bsize, NOCRED, &bp);
654 if (error) {
655 /*
656 * fs->e2fs_gd and fs->e2fs_contigdirs
657 * will be freed later by the caller,
658 * because this function could be called from
659 * MNT_UPDATE path.
660 */
661 return (error);
662 }
663 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) {
664 memcpy(&fs->e2fs_gd[
665 i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
666 bp->b_data, fs->e2fs_bsize);
667 } else {
668 for (j = 0; j < e2fs_descpb &&
669 g_count < fs->e2fs_gcount; j++, g_count++)
670 memcpy(&fs->e2fs_gd[g_count],
671 bp->b_data + j * E2FS_REV0_GD_SIZE,
672 E2FS_REV0_GD_SIZE);
673 }
674 brelse(bp);
675 bp = NULL;
676 }
677
678 /* Validate cgs consistency */
679 error = ext2_cg_validate(fs);
680 if (error)
681 return (error);
682
683 /* Verfy cgs csum */
684 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) ||
685 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) {
686 error = ext2_gd_csum_verify(fs, devvp->v_rdev);
687 if (error)
688 return (error);
689 }
690 /* Initialization for the ext2 Orlov allocator variant. */
691 fs->e2fs_total_dir = 0;
692 for (i = 0; i < fs->e2fs_gcount; i++)
693 fs->e2fs_total_dir += e2fs_gd_get_ndirs(&fs->e2fs_gd[i]);
694
695 if (le32toh(es->e2fs_rev) == E2FS_REV0 ||
696 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE))
697 fs->e2fs_maxfilesize = 0x7fffffff;
698 else {
699 fs->e2fs_maxfilesize = 0xffffffffffff;
700 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE))
701 fs->e2fs_maxfilesize = 0x7fffffffffffffff;
702 }
703 if (le32toh(es->e4fs_flags) & E2FS_UNSIGNED_HASH) {
704 fs->e2fs_uhash = 3;
705 } else if ((le32toh(es->e4fs_flags) & E2FS_SIGNED_HASH) == 0) {
706 #ifdef __CHAR_UNSIGNED__
707 es->e4fs_flags = htole32(le32toh(es->e4fs_flags) | E2FS_UNSIGNED_HASH);
708 fs->e2fs_uhash = 3;
709 #else
710 es->e4fs_flags = htole32(le32toh(es->e4fs_flags) | E2FS_SIGNED_HASH);
711 #endif
712 }
713 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM))
714 error = ext2_sb_csum_verify(fs);
715
716 return (error);
717 }
718
719 /*
720 * Reload all incore data for a filesystem (used after running fsck on
721 * the root filesystem and finding things to fix). The filesystem must
722 * be mounted read-only.
723 *
724 * Things to do to update the mount:
725 * 1) invalidate all cached meta-data.
726 * 2) re-read superblock from disk.
727 * 3) invalidate all cluster summary information.
728 * 4) invalidate all inactive vnodes.
729 * 5) invalidate all cached file data.
730 * 6) re-read inode data for all active vnodes.
731 * XXX we are missing some steps, in particular # 3, this has to be reviewed.
732 */
733 static int
ext2_reload(struct mount * mp,struct thread * td)734 ext2_reload(struct mount *mp, struct thread *td)
735 {
736 struct vnode *vp, *mvp, *devvp;
737 struct inode *ip;
738 struct buf *bp;
739 struct ext2fs *es;
740 struct m_ext2fs *fs;
741 struct csum *sump;
742 int error, i;
743 int32_t *lp;
744
745 if ((mp->mnt_flag & MNT_RDONLY) == 0)
746 return (EINVAL);
747 /*
748 * Step 1: invalidate all cached meta-data.
749 */
750 devvp = VFSTOEXT2(mp)->um_devvp;
751 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
752 if (vinvalbuf(devvp, 0, 0, 0) != 0)
753 panic("ext2_reload: dirty1");
754 VOP_UNLOCK(devvp);
755
756 /*
757 * Step 2: re-read superblock from disk.
758 * constants have been adjusted for ext2
759 */
760 if ((error = bread(devvp, SBLOCK, SBLOCKBLKSIZE, NOCRED, &bp)) != 0)
761 return (error);
762 es = (struct ext2fs *)((char *)bp->b_data + SBLOCKOFFSET);
763 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
764 brelse(bp);
765 return (EIO); /* XXX needs translation */
766 }
767 fs = VFSTOEXT2(mp)->um_e2fs;
768 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs));
769
770 if ((error = ext2_compute_sb_data(devvp, es, fs)) != 0) {
771 brelse(bp);
772 return (error);
773 }
774
775 brelse(bp);
776
777 /*
778 * Step 3: invalidate all cluster summary information.
779 */
780 if (fs->e2fs_contigsumsize > 0) {
781 lp = fs->e2fs_maxcluster;
782 sump = fs->e2fs_clustersum;
783 for (i = 0; i < fs->e2fs_gcount; i++, sump++) {
784 *lp++ = fs->e2fs_contigsumsize;
785 sump->cs_init = 0;
786 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1);
787 }
788 }
789
790 loop:
791 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
792 /*
793 * Step 4: invalidate all cached file data.
794 */
795 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) {
796 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
797 goto loop;
798 }
799 if (vinvalbuf(vp, 0, 0, 0))
800 panic("ext2_reload: dirty2");
801
802 /*
803 * Step 5: re-read inode data for all active vnodes.
804 */
805 ip = VTOI(vp);
806 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
807 (int)fs->e2fs_bsize, NOCRED, &bp);
808 if (error) {
809 vput(vp);
810 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
811 return (error);
812 }
813
814 error = ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data +
815 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip);
816
817 brelse(bp);
818 vput(vp);
819
820 if (error) {
821 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
822 return (error);
823 }
824 }
825 return (0);
826 }
827
828 /*
829 * Common code for mount and mountroot.
830 */
831 static int
ext2_mountfs(struct vnode * devvp,struct mount * mp)832 ext2_mountfs(struct vnode *devvp, struct mount *mp)
833 {
834 struct ext2mount *ump;
835 struct buf *bp;
836 struct m_ext2fs *fs;
837 struct ext2fs *es;
838 struct cdev *dev = devvp->v_rdev;
839 struct g_consumer *cp;
840 struct bufobj *bo;
841 struct csum *sump;
842 int error;
843 int ronly;
844 int i;
845 u_long size;
846 int32_t *lp;
847 int32_t e2fs_maxcontig;
848
849 bp = NULL;
850 ump = NULL;
851
852 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0);
853 /* XXX: use VOP_ACESS to check FS perms */
854 g_topology_lock();
855 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1);
856 g_topology_unlock();
857 VOP_UNLOCK(devvp);
858 if (error)
859 return (error);
860
861 if (PAGE_SIZE != SBLOCKBLKSIZE) {
862 printf("WARNING: Unsupported page size %d\n", PAGE_SIZE);
863 error = EINVAL;
864 goto out;
865 }
866 if (cp->provider->sectorsize > PAGE_SIZE) {
867 printf("WARNING: Device sectorsize(%d) is more than %d\n",
868 cp->provider->sectorsize, PAGE_SIZE);
869 error = EINVAL;
870 goto out;
871 }
872
873 bo = &devvp->v_bufobj;
874 bo->bo_private = cp;
875 bo->bo_ops = g_vfs_bufops;
876 if (devvp->v_rdev->si_iosize_max != 0)
877 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
878 if (mp->mnt_iosize_max > maxphys)
879 mp->mnt_iosize_max = maxphys;
880 if ((error = bread(devvp, SBLOCK, SBLOCKBLKSIZE, NOCRED, &bp)) != 0)
881 goto out;
882 es = (struct ext2fs *)((char *)bp->b_data + SBLOCKOFFSET);
883 if (ext2_check_sb_compat(es, dev, ronly) != 0) {
884 error = EINVAL; /* XXX needs translation */
885 goto out;
886 }
887 if ((le16toh(es->e2fs_state) & E2FS_ISCLEAN) == 0 ||
888 (le16toh(es->e2fs_state) & E2FS_ERRORS)) {
889 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
890 printf(
891 "WARNING: Filesystem was not properly dismounted\n");
892 } else {
893 printf(
894 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n");
895 error = EPERM;
896 goto out;
897 }
898 }
899 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO);
900
901 /*
902 * I don't know whether this is the right strategy. Note that
903 * we dynamically allocate both an m_ext2fs and an ext2fs
904 * while Linux keeps the super block in a locked buffer.
905 */
906 ump->um_e2fs = malloc(sizeof(struct m_ext2fs),
907 M_EXT2MNT, M_WAITOK | M_ZERO);
908 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs),
909 M_EXT2MNT, M_WAITOK);
910 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF);
911 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs));
912 if ((error = ext2_compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs)))
913 goto out;
914
915 /*
916 * Calculate the maximum contiguous blocks and size of cluster summary
917 * array. In FFS this is done by newfs; however, the superblock
918 * in ext2fs doesn't have these variables, so we can calculate
919 * them here.
920 */
921 e2fs_maxcontig = MAX(1, maxphys / ump->um_e2fs->e2fs_bsize);
922 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG);
923 ump->um_e2fs->e2fs_maxsymlinklen = EXT2_MAXSYMLINKLEN;
924 if (ump->um_e2fs->e2fs_contigsumsize > 0) {
925 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t);
926 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK);
927 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum);
928 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK);
929 lp = ump->um_e2fs->e2fs_maxcluster;
930 sump = ump->um_e2fs->e2fs_clustersum;
931 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) {
932 *lp++ = ump->um_e2fs->e2fs_contigsumsize;
933 sump->cs_init = 0;
934 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) *
935 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO);
936 }
937 }
938
939 brelse(bp);
940 bp = NULL;
941 fs = ump->um_e2fs;
942 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */
943
944 /*
945 * If the fs is not mounted read-only, make sure the super block is
946 * always written back on a sync().
947 */
948 fs->e2fs_wasvalid = le16toh(fs->e2fs->e2fs_state) & E2FS_ISCLEAN ? 1 : 0;
949 if (ronly == 0) {
950 fs->e2fs_fmod = 1; /* mark it modified and set fs invalid */
951 fs->e2fs->e2fs_state =
952 htole16(le16toh(fs->e2fs->e2fs_state) & ~E2FS_ISCLEAN);
953 }
954 mp->mnt_data = ump;
955 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
956 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
957 MNT_ILOCK(mp);
958 mp->mnt_flag |= MNT_LOCAL;
959 MNT_IUNLOCK(mp);
960 ump->um_mountp = mp;
961 ump->um_dev = dev;
962 ump->um_devvp = devvp;
963 ump->um_bo = &devvp->v_bufobj;
964 ump->um_cp = cp;
965
966 /*
967 * Setting those two parameters allowed us to use
968 * ufs_bmap w/o changse!
969 */
970 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
971 ump->um_bptrtodb = le32toh(fs->e2fs->e2fs_log_bsize) + 1;
972 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
973 if (ronly == 0)
974 ext2_sbupdate(ump, MNT_WAIT);
975 /*
976 * Initialize filesystem stat information in mount struct.
977 */
978 MNT_ILOCK(mp);
979 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED |
980 MNTK_USES_BCACHE;
981 MNT_IUNLOCK(mp);
982 return (0);
983 out:
984 if (bp)
985 brelse(bp);
986 if (cp != NULL) {
987 g_topology_lock();
988 g_vfs_close(cp);
989 g_topology_unlock();
990 }
991 if (ump) {
992 mtx_destroy(EXT2_MTX(ump));
993 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT);
994 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT);
995 free(ump->um_e2fs->e2fs, M_EXT2MNT);
996 free(ump->um_e2fs, M_EXT2MNT);
997 free(ump, M_EXT2MNT);
998 mp->mnt_data = NULL;
999 }
1000 return (error);
1001 }
1002
1003 /*
1004 * Unmount system call.
1005 */
1006 static int
ext2_unmount(struct mount * mp,int mntflags)1007 ext2_unmount(struct mount *mp, int mntflags)
1008 {
1009 struct ext2mount *ump;
1010 struct m_ext2fs *fs;
1011 struct csum *sump;
1012 int error, flags, i, ronly;
1013
1014 flags = 0;
1015 if (mntflags & MNT_FORCE) {
1016 if (mp->mnt_flag & MNT_ROOTFS)
1017 return (EINVAL);
1018 flags |= FORCECLOSE;
1019 }
1020 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0)
1021 return (error);
1022 ump = VFSTOEXT2(mp);
1023 fs = ump->um_e2fs;
1024 ronly = fs->e2fs_ronly;
1025 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) {
1026 if (fs->e2fs_wasvalid)
1027 fs->e2fs->e2fs_state =
1028 htole16(le16toh(fs->e2fs->e2fs_state) | E2FS_ISCLEAN);
1029 ext2_sbupdate(ump, MNT_WAIT);
1030 }
1031
1032 g_topology_lock();
1033 g_vfs_close(ump->um_cp);
1034 g_topology_unlock();
1035 vrele(ump->um_devvp);
1036 sump = fs->e2fs_clustersum;
1037 for (i = 0; i < fs->e2fs_gcount; i++, sump++)
1038 free(sump->cs_sum, M_EXT2MNT);
1039 free(fs->e2fs_clustersum, M_EXT2MNT);
1040 free(fs->e2fs_maxcluster, M_EXT2MNT);
1041 free(fs->e2fs_gd, M_EXT2MNT);
1042 free(fs->e2fs_contigdirs, M_EXT2MNT);
1043 free(fs->e2fs, M_EXT2MNT);
1044 free(fs, M_EXT2MNT);
1045 free(ump, M_EXT2MNT);
1046 mp->mnt_data = NULL;
1047 return (error);
1048 }
1049
1050 /*
1051 * Flush out all the files in a filesystem.
1052 */
1053 static int
ext2_flushfiles(struct mount * mp,int flags,struct thread * td)1054 ext2_flushfiles(struct mount *mp, int flags, struct thread *td)
1055 {
1056 int error;
1057
1058 error = vflush(mp, 0, flags, td);
1059 return (error);
1060 }
1061
1062 /*
1063 * Get filesystem statistics.
1064 */
1065 int
ext2_statfs(struct mount * mp,struct statfs * sbp)1066 ext2_statfs(struct mount *mp, struct statfs *sbp)
1067 {
1068 struct ext2mount *ump;
1069 struct m_ext2fs *fs;
1070 uint32_t overhead, overhead_per_group, ngdb;
1071 int i, ngroups;
1072
1073 ump = VFSTOEXT2(mp);
1074 fs = ump->um_e2fs;
1075 if (le16toh(fs->e2fs->e2fs_magic) != E2FS_MAGIC)
1076 panic("ext2_statfs");
1077
1078 /*
1079 * Compute the overhead (FS structures)
1080 */
1081 overhead_per_group =
1082 1 /* block bitmap */ +
1083 1 /* inode bitmap */ +
1084 fs->e2fs_itpg;
1085 overhead = le32toh(fs->e2fs->e2fs_first_dblock) +
1086 fs->e2fs_gcount * overhead_per_group;
1087 if (le32toh(fs->e2fs->e2fs_rev) > E2FS_REV0 &&
1088 le32toh(fs->e2fs->e2fs_features_rocompat) & EXT2F_ROCOMPAT_SPARSESUPER) {
1089 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) {
1090 if (ext2_cg_has_sb(fs, i))
1091 ngroups++;
1092 }
1093 } else {
1094 ngroups = fs->e2fs_gcount;
1095 }
1096 ngdb = fs->e2fs_gdbcount;
1097 if (le32toh(fs->e2fs->e2fs_rev) > E2FS_REV0 &&
1098 le32toh(fs->e2fs->e2fs_features_compat) & EXT2F_COMPAT_RESIZE)
1099 ngdb += le16toh(fs->e2fs->e2fs_reserved_ngdb);
1100 overhead += ngroups * (1 /* superblock */ + ngdb);
1101
1102 sbp->f_bsize = EXT2_FRAG_SIZE(fs);
1103 sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
1104 sbp->f_blocks = fs->e2fs_bcount - overhead;
1105 sbp->f_bfree = fs->e2fs_fbcount;
1106 sbp->f_bavail = sbp->f_bfree - fs->e2fs_rbcount;
1107 sbp->f_files = le32toh(fs->e2fs->e2fs_icount);
1108 sbp->f_ffree = fs->e2fs_ficount;
1109 return (0);
1110 }
1111
1112 /*
1113 * Go through the disk queues to initiate sandbagged IO;
1114 * go through the inodes to write those that have been modified;
1115 * initiate the writing of the super block if it has been modified.
1116 *
1117 * Note: we are always called with the filesystem marked `MPBUSY'.
1118 */
1119 static int
ext2_sync(struct mount * mp,int waitfor)1120 ext2_sync(struct mount *mp, int waitfor)
1121 {
1122 struct vnode *mvp, *vp;
1123 struct thread *td;
1124 struct inode *ip;
1125 struct ext2mount *ump = VFSTOEXT2(mp);
1126 struct m_ext2fs *fs;
1127 int error, allerror = 0;
1128
1129 td = curthread;
1130 fs = ump->um_e2fs;
1131 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */
1132 panic("ext2_sync: rofs mod fs=%s", fs->e2fs_fsmnt);
1133 }
1134
1135 /*
1136 * Write back each (modified) inode.
1137 */
1138 loop:
1139 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
1140 if (vp->v_type == VNON) {
1141 VI_UNLOCK(vp);
1142 continue;
1143 }
1144 ip = VTOI(vp);
1145 if ((ip->i_flag &
1146 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
1147 (vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
1148 waitfor == MNT_LAZY)) {
1149 VI_UNLOCK(vp);
1150 continue;
1151 }
1152 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK);
1153 if (error) {
1154 if (error == ENOENT) {
1155 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
1156 goto loop;
1157 }
1158 continue;
1159 }
1160 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0)
1161 allerror = error;
1162 vput(vp);
1163 }
1164
1165 /*
1166 * Force stale filesystem control information to be flushed.
1167 */
1168 if (waitfor != MNT_LAZY) {
1169 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
1170 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
1171 allerror = error;
1172 VOP_UNLOCK(ump->um_devvp);
1173 }
1174
1175 /*
1176 * Write back modified superblock.
1177 */
1178 if (fs->e2fs_fmod != 0) {
1179 fs->e2fs_fmod = 0;
1180 fs->e2fs->e2fs_wtime = htole32(time_second);
1181 if ((error = ext2_cgupdate(ump, waitfor)) != 0)
1182 allerror = error;
1183 }
1184 return (allerror);
1185 }
1186
1187 /*
1188 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it
1189 * in from disk. If it is in core, wait for the lock bit to clear, then
1190 * return the inode locked. Detection and handling of mount points must be
1191 * done by the calling routine.
1192 */
1193 static int
ext2_vget(struct mount * mp,ino_t ino,int flags,struct vnode ** vpp)1194 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
1195 {
1196 struct m_ext2fs *fs;
1197 struct inode *ip;
1198 struct ext2mount *ump;
1199 struct buf *bp;
1200 struct vnode *vp;
1201 struct thread *td;
1202 unsigned int i, used_blocks;
1203 int error;
1204
1205 td = curthread;
1206 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL);
1207 if (error || *vpp != NULL)
1208 return (error);
1209
1210 ump = VFSTOEXT2(mp);
1211 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO);
1212
1213 /* Allocate a new vnode/inode. */
1214 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) {
1215 *vpp = NULL;
1216 free(ip, M_EXT2NODE);
1217 return (error);
1218 }
1219 vp->v_data = ip;
1220 ip->i_vnode = vp;
1221 ip->i_e2fs = fs = ump->um_e2fs;
1222 ip->i_ump = ump;
1223 ip->i_number = ino;
1224 cluster_init_vn(&ip->i_clusterw);
1225
1226 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
1227 error = insmntque(vp, mp);
1228 if (error != 0) {
1229 free(ip, M_EXT2NODE);
1230 *vpp = NULL;
1231 return (error);
1232 }
1233 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
1234 if (error || *vpp != NULL)
1235 return (error);
1236
1237 /* Read in the disk contents for the inode, copy into the inode. */
1238 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
1239 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
1240 /*
1241 * The inode does not contain anything useful, so it would
1242 * be misleading to leave it on its hash chain. With mode
1243 * still zero, it will be unlinked and returned to the free
1244 * list by vput().
1245 */
1246 brelse(bp);
1247 vput(vp);
1248 *vpp = NULL;
1249 return (error);
1250 }
1251 /* convert ext2 inode to dinode */
1252 error = ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data +
1253 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ino)), ip);
1254 if (error) {
1255 brelse(bp);
1256 vput(vp);
1257 *vpp = NULL;
1258 return (error);
1259 }
1260 ip->i_block_group = ino_to_cg(fs, ino);
1261 ip->i_next_alloc_block = 0;
1262 ip->i_next_alloc_goal = 0;
1263
1264 /*
1265 * Now we want to make sure that block pointers for unused
1266 * blocks are zeroed out - ext2_balloc depends on this
1267 * although for regular files and directories only
1268 *
1269 * If IN_E4EXTENTS is enabled, unused blocks are not zeroed
1270 * out because we could corrupt the extent tree.
1271 */
1272 if (!(ip->i_flag & IN_E4EXTENTS) &&
1273 (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) {
1274 used_blocks = howmany(ip->i_size, fs->e2fs_bsize);
1275 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
1276 ip->i_db[i] = 0;
1277 }
1278
1279 bqrelse(bp);
1280
1281 #ifdef EXT2FS_PRINT_EXTENTS
1282 ext2_print_inode(ip);
1283 error = ext4_ext_walk(ip);
1284 if (error) {
1285 vput(vp);
1286 *vpp = NULL;
1287 return (error);
1288 }
1289 #endif
1290
1291 /*
1292 * Initialize the vnode from the inode, check for aliases.
1293 * Note that the underlying vnode may have changed.
1294 */
1295 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) {
1296 vput(vp);
1297 *vpp = NULL;
1298 return (error);
1299 }
1300
1301 /*
1302 * Finish inode initialization.
1303 */
1304
1305 vn_set_state(vp, VSTATE_CONSTRUCTED);
1306 *vpp = vp;
1307 return (0);
1308 }
1309
1310 /*
1311 * File handle to vnode
1312 *
1313 * Have to be really careful about stale file handles:
1314 * - check that the inode number is valid
1315 * - call ext2_vget() to get the locked inode
1316 * - check for an unallocated inode (i_mode == 0)
1317 * - check that the given client host has export rights and return
1318 * those rights via. exflagsp and credanonp
1319 */
1320 static int
ext2_fhtovp(struct mount * mp,struct fid * fhp,int flags,struct vnode ** vpp)1321 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
1322 {
1323 struct inode *ip;
1324 struct ufid *ufhp;
1325 struct vnode *nvp;
1326 struct m_ext2fs *fs;
1327 int error;
1328
1329 ufhp = (struct ufid *)fhp;
1330 fs = VFSTOEXT2(mp)->um_e2fs;
1331 if (ufhp->ufid_ino < EXT2_ROOTINO ||
1332 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs_ipg)
1333 return (ESTALE);
1334
1335 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
1336 if (error) {
1337 *vpp = NULLVP;
1338 return (error);
1339 }
1340 ip = VTOI(nvp);
1341 if (ip->i_mode == 0 ||
1342 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) {
1343 vput(nvp);
1344 *vpp = NULLVP;
1345 return (ESTALE);
1346 }
1347 *vpp = nvp;
1348 vnode_create_vobject(*vpp, 0, curthread);
1349 return (0);
1350 }
1351
1352 /*
1353 * Write a superblock and associated information back to disk.
1354 */
1355 static int
ext2_sbupdate(struct ext2mount * mp,int waitfor)1356 ext2_sbupdate(struct ext2mount *mp, int waitfor)
1357 {
1358 struct m_ext2fs *fs = mp->um_e2fs;
1359 struct ext2fs *es = fs->e2fs;
1360 struct buf *bp;
1361 int error = 0;
1362
1363 es->e2fs_bcount = htole32(fs->e2fs_bcount & 0xffffffff);
1364 es->e2fs_rbcount = htole32(fs->e2fs_rbcount & 0xffffffff);
1365 es->e2fs_fbcount = htole32(fs->e2fs_fbcount & 0xffffffff);
1366 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) {
1367 es->e4fs_bcount_hi = htole32(fs->e2fs_bcount >> 32);
1368 es->e4fs_rbcount_hi = htole32(fs->e2fs_rbcount >> 32);
1369 es->e4fs_fbcount_hi = htole32(fs->e2fs_fbcount >> 32);
1370 }
1371
1372 es->e2fs_ficount = htole32(fs->e2fs_ficount);
1373
1374 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM))
1375 ext2_sb_csum_set(fs);
1376
1377 error = bread(mp->um_devvp, SBLOCK, SBLOCKBLKSIZE, NOCRED, &bp);
1378 if (error != 0)
1379 return (error);
1380
1381 memcpy((char *)bp->b_data + SBLOCKOFFSET, (caddr_t)es,
1382 (u_int)sizeof(struct ext2fs));
1383 if (waitfor == MNT_WAIT)
1384 error = bwrite(bp);
1385 else
1386 bawrite(bp);
1387
1388 /*
1389 * The buffers for group descriptors, inode bitmaps and block bitmaps
1390 * are not busy at this point and are (hopefully) written by the
1391 * usual sync mechanism. No need to write them here.
1392 */
1393 return (error);
1394 }
1395 int
ext2_cgupdate(struct ext2mount * mp,int waitfor)1396 ext2_cgupdate(struct ext2mount *mp, int waitfor)
1397 {
1398 struct m_ext2fs *fs = mp->um_e2fs;
1399 struct buf *bp;
1400 int i, j, g_count = 0, error = 0, allerror = 0;
1401
1402 allerror = ext2_sbupdate(mp, waitfor);
1403
1404 /* Update gd csums */
1405 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) ||
1406 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM))
1407 ext2_gd_csum_set(fs);
1408
1409 for (i = 0; i < fs->e2fs_gdbcount; i++) {
1410 bp = getblk(mp->um_devvp, fsbtodb(fs,
1411 ext2_cg_location(fs, i)),
1412 fs->e2fs_bsize, 0, 0, 0);
1413 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) {
1414 memcpy(bp->b_data, &fs->e2fs_gd[
1415 i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
1416 fs->e2fs_bsize);
1417 } else {
1418 for (j = 0; j < fs->e2fs_bsize / E2FS_REV0_GD_SIZE &&
1419 g_count < fs->e2fs_gcount; j++, g_count++)
1420 memcpy(bp->b_data + j * E2FS_REV0_GD_SIZE,
1421 &fs->e2fs_gd[g_count], E2FS_REV0_GD_SIZE);
1422 }
1423 if (waitfor == MNT_WAIT)
1424 error = bwrite(bp);
1425 else
1426 bawrite(bp);
1427 }
1428
1429 if (!allerror && error)
1430 allerror = error;
1431 return (allerror);
1432 }
1433
1434 /*
1435 * Return the root of a filesystem.
1436 */
1437 static int
ext2_root(struct mount * mp,int flags,struct vnode ** vpp)1438 ext2_root(struct mount *mp, int flags, struct vnode **vpp)
1439 {
1440 struct vnode *nvp;
1441 int error;
1442
1443 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp);
1444 if (error)
1445 return (error);
1446 *vpp = nvp;
1447 return (0);
1448 }
1449