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 * @(#)ffs_vfsops.c 8.8 (Berkeley) 4/18/94
38 * $FreeBSD$
39 */
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/namei.h>
44 #include <sys/priv.h>
45 #include <sys/proc.h>
46 #include <sys/kernel.h>
47 #include <sys/vnode.h>
48 #include <sys/mount.h>
49 #include <sys/bio.h>
50 #include <sys/buf.h>
51 #include <sys/conf.h>
52 #include <sys/endian.h>
53 #include <sys/fcntl.h>
54 #include <sys/malloc.h>
55 #include <sys/sdt.h>
56 #include <sys/stat.h>
57 #include <sys/mutex.h>
58
59 #include <geom/geom.h>
60 #include <geom/geom_vfs.h>
61
62 #include <fs/ext2fs/fs.h>
63 #include <fs/ext2fs/ext2_mount.h>
64 #include <fs/ext2fs/inode.h>
65
66 #include <fs/ext2fs/ext2fs.h>
67 #include <fs/ext2fs/ext2_dinode.h>
68 #include <fs/ext2fs/ext2_extern.h>
69 #include <fs/ext2fs/ext2_extents.h>
70
71 SDT_PROVIDER_DECLARE(ext2fs);
72 /*
73 * ext2fs trace probe:
74 * arg0: verbosity. Higher numbers give more verbose messages
75 * arg1: Textual message
76 */
77 SDT_PROBE_DEFINE2(ext2fs, , vfsops, trace, "int", "char*");
78 SDT_PROBE_DEFINE2(ext2fs, , vfsops, ext2_cg_validate_error, "char*", "int");
79 SDT_PROBE_DEFINE1(ext2fs, , vfsops, ext2_compute_sb_data_error, "char*");
80
81
82 static int ext2_flushfiles(struct mount *mp, int flags, struct thread *td);
83 static int ext2_mountfs(struct vnode *, struct mount *);
84 static int ext2_reload(struct mount *mp, struct thread *td);
85 static int ext2_sbupdate(struct ext2mount *, int);
86 static int ext2_cgupdate(struct ext2mount *, int);
87 static vfs_unmount_t ext2_unmount;
88 static vfs_root_t ext2_root;
89 static vfs_statfs_t ext2_statfs;
90 static vfs_sync_t ext2_sync;
91 static vfs_vget_t ext2_vget;
92 static vfs_fhtovp_t ext2_fhtovp;
93 static vfs_mount_t ext2_mount;
94
95 MALLOC_DEFINE(M_EXT2NODE, "ext2_node", "EXT2 vnode private part");
96 static MALLOC_DEFINE(M_EXT2MNT, "ext2_mount", "EXT2 mount structure");
97
98 static struct vfsops ext2fs_vfsops = {
99 .vfs_fhtovp = ext2_fhtovp,
100 .vfs_mount = ext2_mount,
101 .vfs_root = ext2_root, /* root inode via vget */
102 .vfs_statfs = ext2_statfs,
103 .vfs_sync = ext2_sync,
104 .vfs_unmount = ext2_unmount,
105 .vfs_vget = ext2_vget,
106 };
107
108 VFS_SET(ext2fs_vfsops, ext2fs, 0);
109
110 static int ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev,
111 int ronly);
112 static int ext2_compute_sb_data(struct vnode * devvp,
113 struct ext2fs * es, struct m_ext2fs * fs);
114
115 static const char *ext2_opts[] = { "acls", "async", "noatime", "noclusterr",
116 "noclusterw", "noexec", "export", "force", "from", "multilabel",
117 "suiddir", "nosymfollow", "sync", "union", NULL };
118
119 /*
120 * VFS Operations.
121 *
122 * mount system call
123 */
124 static int
125 ext2_mount(struct mount *mp)
126 {
127 struct vfsoptlist *opts;
128 struct vnode *devvp;
129 struct thread *td;
130 struct ext2mount *ump = NULL;
131 struct m_ext2fs *fs;
132 struct nameidata nd, *ndp = &nd;
133 accmode_t accmode;
134 char *path, *fspec;
135 int error, flags, len;
136
137 td = curthread;
138 opts = mp->mnt_optnew;
139
140 if (vfs_filteropt(opts, ext2_opts))
141 return (EINVAL);
142
143 vfs_getopt(opts, "fspath", (void **)&path, NULL);
144 /* Double-check the length of path.. */
145 if (strlen(path) >= MAXMNTLEN)
146 return (ENAMETOOLONG);
147
148 fspec = NULL;
149 error = vfs_getopt(opts, "from", (void **)&fspec, &len);
150 if (!error && fspec[len - 1] != '\0')
151 return (EINVAL);
152
153 /*
154 * If updating, check whether changing from read-only to
155 * read/write; if there is no device name, that's all we do.
156 */
157 if (mp->mnt_flag & MNT_UPDATE) {
158 ump = VFSTOEXT2(mp);
159 fs = ump->um_e2fs;
160 error = 0;
161 if (fs->e2fs_ronly == 0 &&
162 vfs_flagopt(opts, "ro", NULL, 0)) {
163 error = VFS_SYNC(mp, MNT_WAIT);
164 if (error)
165 return (error);
166 flags = WRITECLOSE;
167 if (mp->mnt_flag & MNT_FORCE)
168 flags |= FORCECLOSE;
169 error = ext2_flushfiles(mp, flags, td);
170 if (error == 0 && fs->e2fs_wasvalid &&
171 ext2_cgupdate(ump, MNT_WAIT) == 0) {
172 fs->e2fs->e2fs_state |= E2FS_ISCLEAN;
173 ext2_sbupdate(ump, MNT_WAIT);
174 }
175 fs->e2fs_ronly = 1;
176 vfs_flagopt(opts, "ro", &mp->mnt_flag, MNT_RDONLY);
177 g_topology_lock();
178 g_access(ump->um_cp, 0, -1, 0);
179 g_topology_unlock();
180 }
181 if (!error && (mp->mnt_flag & MNT_RELOAD))
182 error = ext2_reload(mp, td);
183 if (error)
184 return (error);
185 devvp = ump->um_devvp;
186 if (fs->e2fs_ronly && !vfs_flagopt(opts, "ro", NULL, 0)) {
187 if (ext2_check_sb_compat(fs->e2fs, devvp->v_rdev, 0))
188 return (EPERM);
189
190 /*
191 * If upgrade to read-write by non-root, then verify
192 * that user has necessary permissions on the device.
193 */
194 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
195 error = VOP_ACCESS(devvp, VREAD | VWRITE,
196 td->td_ucred, td);
197 if (error)
198 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
199 if (error) {
200 VOP_UNLOCK(devvp, 0);
201 return (error);
202 }
203 VOP_UNLOCK(devvp, 0);
204 g_topology_lock();
205 error = g_access(ump->um_cp, 0, 1, 0);
206 g_topology_unlock();
207 if (error)
208 return (error);
209
210 if ((fs->e2fs->e2fs_state & E2FS_ISCLEAN) == 0 ||
211 (fs->e2fs->e2fs_state & E2FS_ERRORS)) {
212 if (mp->mnt_flag & MNT_FORCE) {
213 printf(
214 "WARNING: %s was not properly dismounted\n", fs->e2fs_fsmnt);
215 } else {
216 printf(
217 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
218 fs->e2fs_fsmnt);
219 return (EPERM);
220 }
221 }
222 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN;
223 (void)ext2_cgupdate(ump, MNT_WAIT);
224 fs->e2fs_ronly = 0;
225 MNT_ILOCK(mp);
226 mp->mnt_flag &= ~MNT_RDONLY;
227 MNT_IUNLOCK(mp);
228 }
229 if (vfs_flagopt(opts, "export", NULL, 0)) {
230 /* Process export requests in vfs_mount.c. */
231 return (error);
232 }
233 }
234
235 /*
236 * Not an update, or updating the name: look up the name
237 * and verify that it refers to a sensible disk device.
238 */
239 if (fspec == NULL)
240 return (EINVAL);
241 NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td);
242 if ((error = namei(ndp)) != 0)
243 return (error);
244 NDFREE(ndp, NDF_ONLY_PNBUF);
245 devvp = ndp->ni_vp;
246
247 if (!vn_isdisk(devvp, &error)) {
248 vput(devvp);
249 return (error);
250 }
251
252 /*
253 * If mount by non-root, then verify that user has necessary
254 * permissions on the device.
255 *
256 * XXXRW: VOP_ACCESS() enough?
257 */
258 accmode = VREAD;
259 if ((mp->mnt_flag & MNT_RDONLY) == 0)
260 accmode |= VWRITE;
261 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td);
262 if (error)
263 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
264 if (error) {
265 vput(devvp);
266 return (error);
267 }
268
269 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
270 error = ext2_mountfs(devvp, mp);
271 } else {
272 if (devvp != ump->um_devvp) {
273 vput(devvp);
274 return (EINVAL); /* needs translation */
275 } else
276 vput(devvp);
277 }
278 if (error) {
279 vrele(devvp);
280 return (error);
281 }
282 ump = VFSTOEXT2(mp);
283 fs = ump->um_e2fs;
284
285 /*
286 * Note that this strncpy() is ok because of a check at the start
287 * of ext2_mount().
288 */
289 strncpy(fs->e2fs_fsmnt, path, MAXMNTLEN);
290 fs->e2fs_fsmnt[MAXMNTLEN - 1] = '\0';
291 vfs_mountedfrom(mp, fspec);
292 return (0);
293 }
294
295 static int
296 ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, int ronly)
297 {
298 uint32_t i, mask;
299
300 if (es->e2fs_magic != E2FS_MAGIC) {
301 printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n",
302 devtoname(dev), es->e2fs_magic, E2FS_MAGIC);
303 return (1);
304 }
305 if (es->e2fs_rev > E2FS_REV0) {
306 mask = es->e2fs_features_incompat & ~(EXT2F_INCOMPAT_SUPP);
307 if (mask) {
308 printf("WARNING: mount of %s denied due to "
309 "unsupported optional features:\n", devtoname(dev));
310 for (i = 0;
311 i < sizeof(incompat)/sizeof(struct ext2_feature);
312 i++)
313 if (mask & incompat[i].mask)
314 printf("%s ", incompat[i].name);
315 printf("\n");
316 return (1);
317 }
318 mask = es->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP;
319 if (!ronly && mask) {
320 printf("WARNING: R/W mount of %s denied due to "
321 "unsupported optional features:\n", devtoname(dev));
322 for (i = 0;
323 i < sizeof(ro_compat)/sizeof(struct ext2_feature);
324 i++)
325 if (mask & ro_compat[i].mask)
326 printf("%s ", ro_compat[i].name);
327 printf("\n");
328 return (1);
329 }
330 }
331 return (0);
332 }
333
334 static e4fs_daddr_t
335 ext2_cg_location(struct m_ext2fs *fs, int number)
336 {
337 int cg, descpb, logical_sb, has_super = 0;
338
339 /*
340 * Adjust logical superblock block number.
341 * Godmar thinks: if the blocksize is greater than 1024, then
342 * the superblock is logically part of block zero.
343 */
344 logical_sb = fs->e2fs_bsize > SBSIZE ? 0 : 1;
345
346 if (!EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_META_BG) ||
347 number < fs->e2fs->e3fs_first_meta_bg)
348 return (logical_sb + number + 1);
349
350 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT))
351 descpb = fs->e2fs_bsize / sizeof(struct ext2_gd);
352 else
353 descpb = fs->e2fs_bsize / E2FS_REV0_GD_SIZE;
354
355 cg = descpb * number;
356
357 if (ext2_cg_has_sb(fs, cg))
358 has_super = 1;
359
360 return (has_super + cg * (e4fs_daddr_t)EXT2_BLOCKS_PER_GROUP(fs) +
361 fs->e2fs->e2fs_first_dblock);
362 }
363
364 static int
365 ext2_cg_validate(struct m_ext2fs *fs)
366 {
367 uint64_t b_bitmap;
368 uint64_t i_bitmap;
369 uint64_t i_tables;
370 uint64_t first_block, last_block, last_cg_block;
371 struct ext2_gd *gd;
372 unsigned int i, cg_count;
373
374 first_block = fs->e2fs->e2fs_first_dblock;
375 last_cg_block = ext2_cg_number_gdb(fs, 0);
376 cg_count = fs->e2fs_gcount;
377
378 for (i = 0; i < fs->e2fs_gcount; i++) {
379 gd = &fs->e2fs_gd[i];
380
381 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_FLEX_BG) ||
382 i == fs->e2fs_gcount - 1) {
383 last_block = fs->e2fs_bcount - 1;
384 } else {
385 last_block = first_block +
386 (EXT2_BLOCKS_PER_GROUP(fs) - 1);
387 }
388
389 if ((cg_count == fs->e2fs_gcount) &&
390 !(gd->ext4bgd_flags & EXT2_BG_INODE_ZEROED))
391 cg_count = i;
392
393 b_bitmap = e2fs_gd_get_b_bitmap(gd);
394 if (b_bitmap == 0) {
395 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
396 "block bitmap is zero", i);
397 return (EINVAL);
398
399 }
400 if (b_bitmap <= last_cg_block) {
401 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
402 "block bitmap overlaps gds", i);
403 return (EINVAL);
404 }
405 if (b_bitmap < first_block || b_bitmap > last_block) {
406 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
407 "block bitmap not in group", i);
408 return (EINVAL);
409 }
410
411 i_bitmap = e2fs_gd_get_i_bitmap(gd);
412 if (i_bitmap == 0) {
413 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
414 "inode bitmap is zero", i);
415 return (EINVAL);
416 }
417 if (i_bitmap <= last_cg_block) {
418 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
419 "inode bitmap overlaps gds", i);
420 return (EINVAL);
421 }
422 if (i_bitmap < first_block || i_bitmap > last_block) {
423 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
424 "inode bitmap not in group blk", i);
425 return (EINVAL);
426 }
427
428 i_tables = e2fs_gd_get_i_tables(gd);
429 if (i_tables == 0) {
430 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
431 "inode table is zero", i);
432 return (EINVAL);
433 }
434 if (i_tables <= last_cg_block) {
435 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
436 "inode tables overlaps gds", i);
437 return (EINVAL);
438 }
439 if (i_tables < first_block ||
440 i_tables + fs->e2fs_itpg - 1 > last_block) {
441 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
442 "inode tables not in group blk", i);
443 return (EINVAL);
444 }
445
446 if (!EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_FLEX_BG))
447 first_block += EXT2_BLOCKS_PER_GROUP(fs);
448 }
449
450 return (0);
451 }
452
453 /*
454 * This computes the fields of the m_ext2fs structure from the
455 * data in the ext2fs structure read in.
456 */
457 static int
458 ext2_compute_sb_data(struct vnode *devvp, struct ext2fs *es,
459 struct m_ext2fs *fs)
460 {
461 struct buf *bp;
462 uint32_t e2fs_descpb, e2fs_gdbcount_alloc;
463 int i, j;
464 int g_count = 0;
465 int error;
466
467 /* Check checksum features */
468 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) &&
469 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) {
470 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
471 "incorrect checksum features combination");
472 return (EINVAL);
473 }
474
475 /* Precompute checksum seed for all metadata */
476 ext2_sb_csum_set_seed(fs);
477
478 /* Verify sb csum if possible */
479 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) {
480 error = ext2_sb_csum_verify(fs);
481 if (error) {
482 return (error);
483 }
484 }
485
486 /* Check for block size = 1K|2K|4K */
487 if (es->e2fs_log_bsize > 2) {
488 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
489 "bad block size");
490 return (EINVAL);
491 }
492
493 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize;
494 fs->e2fs_bsize = 1U << fs->e2fs_bshift;
495 fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1;
496 fs->e2fs_qbmask = fs->e2fs_bsize - 1;
497
498 /* Check for fragment size */
499 if (es->e2fs_log_fsize >
500 (EXT2_MAX_FRAG_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE)) {
501 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
502 "invalid log cluster size");
503 return (EINVAL);
504 }
505
506 fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << es->e2fs_log_fsize;
507 if (fs->e2fs_fsize != fs->e2fs_bsize) {
508 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
509 "fragment size != block size");
510 return (EINVAL);
511 }
512
513 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize;
514
515 /* Check reserved gdt blocks for future filesystem expansion */
516 if (es->e2fs_reserved_ngdb > (fs->e2fs_bsize / 4)) {
517 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
518 "number of reserved GDT blocks too large");
519 return (EINVAL);
520 }
521
522 if (es->e2fs_rev == E2FS_REV0) {
523 fs->e2fs_isize = E2FS_REV0_INODE_SIZE;
524 } else {
525 fs->e2fs_isize = es->e2fs_inode_size;
526
527 /*
528 * Check first ino.
529 */
530 if (es->e2fs_first_ino < EXT2_FIRSTINO) {
531 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
532 "invalid first ino");
533 return (EINVAL);
534 }
535
536 /*
537 * Simple sanity check for superblock inode size value.
538 */
539 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE ||
540 EXT2_INODE_SIZE(fs) > fs->e2fs_bsize ||
541 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) {
542 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
543 "invalid inode size");
544 return (EINVAL);
545 }
546 }
547
548 /* Check group descriptors */
549 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT) &&
550 es->e3fs_desc_size != E2FS_64BIT_GD_SIZE) {
551 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
552 "unsupported 64bit descriptor size");
553 return (EINVAL);
554 }
555
556 fs->e2fs_bpg = es->e2fs_bpg;
557 fs->e2fs_fpg = es->e2fs_fpg;
558 if (fs->e2fs_bpg == 0 || fs->e2fs_fpg == 0) {
559 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
560 "zero blocks/fragments per group");
561 return (EINVAL);
562 } else if (fs->e2fs_bpg != fs->e2fs_fpg) {
563 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
564 "blocks per group not equal fragments per group");
565 return (EINVAL);
566 }
567
568 if (fs->e2fs_bpg != fs->e2fs_bsize * 8) {
569 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
570 "non-standard group size unsupported");
571 return (EINVAL);
572 }
573
574 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs);
575 if (fs->e2fs_ipb == 0 ||
576 fs->e2fs_ipb > fs->e2fs_bsize / E2FS_REV0_INODE_SIZE) {
577 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
578 "bad inodes per block size");
579 return (EINVAL);
580 }
581
582 fs->e2fs_ipg = es->e2fs_ipg;
583 if (fs->e2fs_ipg < fs->e2fs_ipb || fs->e2fs_ipg > fs->e2fs_bsize * 8) {
584 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
585 "invalid inodes per group");
586 return (EINVAL);
587 }
588
589 fs->e2fs_itpg = fs->e2fs_ipg / fs->e2fs_ipb;
590
591 fs->e2fs_bcount = es->e2fs_bcount;
592 fs->e2fs_rbcount = es->e2fs_rbcount;
593 fs->e2fs_fbcount = es->e2fs_fbcount;
594 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) {
595 fs->e2fs_bcount |= (uint64_t)(es->e4fs_bcount_hi) << 32;
596 fs->e2fs_rbcount |= (uint64_t)(es->e4fs_rbcount_hi) << 32;
597 fs->e2fs_fbcount |= (uint64_t)(es->e4fs_fbcount_hi) << 32;
598 }
599 if (fs->e2fs_rbcount > fs->e2fs_bcount ||
600 fs->e2fs_fbcount > fs->e2fs_bcount) {
601 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
602 "invalid block count");
603 return (EINVAL);
604 }
605 if (es->e2fs_first_dblock >= fs->e2fs_bcount) {
606 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
607 "first data block out of range");
608 return (EINVAL);
609 }
610
611 fs->e2fs_gcount = howmany(fs->e2fs_bcount - es->e2fs_first_dblock,
612 EXT2_BLOCKS_PER_GROUP(fs));
613 if (fs->e2fs_gcount > ((uint64_t)1 << 32) - EXT2_DESCS_PER_BLOCK(fs)) {
614 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
615 "groups count too large");
616 return (EINVAL);
617 }
618
619 /* Check for extra isize in big inodes. */
620 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) &&
621 EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) {
622 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
623 "no space for extra inode timestamps");
624 return (EINVAL);
625 }
626
627 /* s_resuid / s_resgid ? */
628
629 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) {
630 e2fs_descpb = fs->e2fs_bsize / E2FS_64BIT_GD_SIZE;
631 e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount, e2fs_descpb);
632 } else {
633 e2fs_descpb = fs->e2fs_bsize / E2FS_REV0_GD_SIZE;
634 e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount,
635 fs->e2fs_bsize / sizeof(struct ext2_gd));
636 }
637 fs->e2fs_gdbcount = howmany(fs->e2fs_gcount, e2fs_descpb);
638 fs->e2fs_gd = malloc(e2fs_gdbcount_alloc * fs->e2fs_bsize,
639 M_EXT2MNT, M_WAITOK | M_ZERO);
640 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount *
641 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK | M_ZERO);
642
643 for (i = 0; i < fs->e2fs_gdbcount; i++) {
644 error = bread(devvp,
645 fsbtodb(fs, ext2_cg_location(fs, i)),
646 fs->e2fs_bsize, NOCRED, &bp);
647 if (error) {
648 /*
649 * fs->e2fs_gd and fs->e2fs_contigdirs
650 * will be freed later by the caller,
651 * because this function could be called from
652 * MNT_UPDATE path.
653 */
654 brelse(bp);
655 return (error);
656 }
657 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) {
658 memcpy(&fs->e2fs_gd[
659 i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
660 bp->b_data, fs->e2fs_bsize);
661 } else {
662 for (j = 0; j < e2fs_descpb &&
663 g_count < fs->e2fs_gcount; j++, g_count++)
664 memcpy(&fs->e2fs_gd[g_count],
665 bp->b_data + j * E2FS_REV0_GD_SIZE,
666 E2FS_REV0_GD_SIZE);
667 }
668 brelse(bp);
669 bp = NULL;
670 }
671
672 /* Validate cgs consistency */
673 error = ext2_cg_validate(fs);
674 if (error)
675 return (error);
676
677 /* Verfy cgs csum */
678 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) ||
679 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) {
680 error = ext2_gd_csum_verify(fs, devvp->v_rdev);
681 if (error)
682 return (error);
683 }
684 /* Initialization for the ext2 Orlov allocator variant. */
685 fs->e2fs_total_dir = 0;
686 for (i = 0; i < fs->e2fs_gcount; i++)
687 fs->e2fs_total_dir += e2fs_gd_get_ndirs(&fs->e2fs_gd[i]);
688
689 if (es->e2fs_rev == E2FS_REV0 ||
690 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE))
691 fs->e2fs_maxfilesize = 0x7fffffff;
692 else {
693 fs->e2fs_maxfilesize = 0xffffffffffff;
694 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE))
695 fs->e2fs_maxfilesize = 0x7fffffffffffffff;
696 }
697 if (es->e4fs_flags & E2FS_UNSIGNED_HASH) {
698 fs->e2fs_uhash = 3;
699 } else if ((es->e4fs_flags & E2FS_SIGNED_HASH) == 0) {
700 #ifdef __CHAR_UNSIGNED__
701 es->e4fs_flags |= E2FS_UNSIGNED_HASH;
702 fs->e2fs_uhash = 3;
703 #else
704 es->e4fs_flags |= E2FS_SIGNED_HASH;
705 #endif
706 }
707 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM))
708 error = ext2_sb_csum_verify(fs);
709
710 return (error);
711 }
712
713 /*
714 * Reload all incore data for a filesystem (used after running fsck on
715 * the root filesystem and finding things to fix). The filesystem must
716 * be mounted read-only.
717 *
718 * Things to do to update the mount:
719 * 1) invalidate all cached meta-data.
720 * 2) re-read superblock from disk.
721 * 3) invalidate all cluster summary information.
722 * 4) invalidate all inactive vnodes.
723 * 5) invalidate all cached file data.
724 * 6) re-read inode data for all active vnodes.
725 * XXX we are missing some steps, in particular # 3, this has to be reviewed.
726 */
727 static int
728 ext2_reload(struct mount *mp, struct thread *td)
729 {
730 struct vnode *vp, *mvp, *devvp;
731 struct inode *ip;
732 struct buf *bp;
733 struct ext2fs *es;
734 struct m_ext2fs *fs;
735 struct csum *sump;
736 int error, i;
737 int32_t *lp;
738
739 if ((mp->mnt_flag & MNT_RDONLY) == 0)
740 return (EINVAL);
741 /*
742 * Step 1: invalidate all cached meta-data.
743 */
744 devvp = VFSTOEXT2(mp)->um_devvp;
745 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
746 if (vinvalbuf(devvp, 0, 0, 0) != 0)
747 panic("ext2_reload: dirty1");
748 VOP_UNLOCK(devvp, 0);
749
750 /*
751 * Step 2: re-read superblock from disk.
752 * constants have been adjusted for ext2
753 */
754 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
755 return (error);
756 es = (struct ext2fs *)bp->b_data;
757 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
758 brelse(bp);
759 return (EIO); /* XXX needs translation */
760 }
761 fs = VFSTOEXT2(mp)->um_e2fs;
762 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs));
763
764 if ((error = ext2_compute_sb_data(devvp, es, fs)) != 0) {
765 brelse(bp);
766 return (error);
767 }
768 #ifdef UNKLAR
769 if (fs->fs_sbsize < SBSIZE)
770 bp->b_flags |= B_INVAL;
771 #endif
772 brelse(bp);
773
774 /*
775 * Step 3: invalidate all cluster summary information.
776 */
777 if (fs->e2fs_contigsumsize > 0) {
778 lp = fs->e2fs_maxcluster;
779 sump = fs->e2fs_clustersum;
780 for (i = 0; i < fs->e2fs_gcount; i++, sump++) {
781 *lp++ = fs->e2fs_contigsumsize;
782 sump->cs_init = 0;
783 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1);
784 }
785 }
786
787 loop:
788 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
789 /*
790 * Step 4: invalidate all cached file data.
791 */
792 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
793 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
794 goto loop;
795 }
796 if (vinvalbuf(vp, 0, 0, 0))
797 panic("ext2_reload: dirty2");
798
799 /*
800 * Step 5: re-read inode data for all active vnodes.
801 */
802 ip = VTOI(vp);
803 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
804 (int)fs->e2fs_bsize, NOCRED, &bp);
805 if (error) {
806 VOP_UNLOCK(vp, 0);
807 vrele(vp);
808 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
809 return (error);
810 }
811
812 error = ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data +
813 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip);
814
815 brelse(bp);
816 VOP_UNLOCK(vp, 0);
817 vrele(vp);
818
819 if (error) {
820 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
821 return (error);
822 }
823 }
824 return (0);
825 }
826
827 /*
828 * Common code for mount and mountroot.
829 */
830 static int
831 ext2_mountfs(struct vnode *devvp, struct mount *mp)
832 {
833 struct ext2mount *ump;
834 struct buf *bp;
835 struct m_ext2fs *fs;
836 struct ext2fs *es;
837 struct cdev *dev = devvp->v_rdev;
838 struct g_consumer *cp;
839 struct bufobj *bo;
840 struct csum *sump;
841 int error;
842 int ronly;
843 int i;
844 u_long size;
845 int32_t *lp;
846 int32_t e2fs_maxcontig;
847
848 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0);
849 /* XXX: use VOP_ACESS to check FS perms */
850 g_topology_lock();
851 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1);
852 g_topology_unlock();
853 VOP_UNLOCK(devvp, 0);
854 if (error)
855 return (error);
856
857 /* XXX: should we check for some sectorsize or 512 instead? */
858 if (((SBSIZE % cp->provider->sectorsize) != 0) ||
859 (SBSIZE < cp->provider->sectorsize)) {
860 g_topology_lock();
861 g_vfs_close(cp);
862 g_topology_unlock();
863 return (EINVAL);
864 }
865
866 bo = &devvp->v_bufobj;
867 bo->bo_private = cp;
868 bo->bo_ops = g_vfs_bufops;
869 if (devvp->v_rdev->si_iosize_max != 0)
870 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
871 if (mp->mnt_iosize_max > MAXPHYS)
872 mp->mnt_iosize_max = MAXPHYS;
873
874 bp = NULL;
875 ump = NULL;
876 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
877 goto out;
878 es = (struct ext2fs *)bp->b_data;
879 if (ext2_check_sb_compat(es, dev, ronly) != 0) {
880 error = EINVAL; /* XXX needs translation */
881 goto out;
882 }
883 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 ||
884 (es->e2fs_state & E2FS_ERRORS)) {
885 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
886 printf(
887 "WARNING: Filesystem was not properly dismounted\n");
888 } else {
889 printf(
890 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n");
891 error = EPERM;
892 goto out;
893 }
894 }
895 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO);
896
897 /*
898 * I don't know whether this is the right strategy. Note that
899 * we dynamically allocate both an m_ext2fs and an ext2fs
900 * while Linux keeps the super block in a locked buffer.
901 */
902 ump->um_e2fs = malloc(sizeof(struct m_ext2fs),
903 M_EXT2MNT, M_WAITOK | M_ZERO);
904 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs),
905 M_EXT2MNT, M_WAITOK);
906 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF);
907 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs));
908 if ((error = ext2_compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs)))
909 goto out;
910
911 /*
912 * Calculate the maximum contiguous blocks and size of cluster summary
913 * array. In FFS this is done by newfs; however, the superblock
914 * in ext2fs doesn't have these variables, so we can calculate
915 * them here.
916 */
917 e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize);
918 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG);
919 if (ump->um_e2fs->e2fs_contigsumsize > 0) {
920 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t);
921 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK);
922 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum);
923 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK);
924 lp = ump->um_e2fs->e2fs_maxcluster;
925 sump = ump->um_e2fs->e2fs_clustersum;
926 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) {
927 *lp++ = ump->um_e2fs->e2fs_contigsumsize;
928 sump->cs_init = 0;
929 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) *
930 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO);
931 }
932 }
933
934 brelse(bp);
935 bp = NULL;
936 fs = ump->um_e2fs;
937 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */
938
939 /*
940 * If the fs is not mounted read-only, make sure the super block is
941 * always written back on a sync().
942 */
943 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0;
944 if (ronly == 0) {
945 fs->e2fs_fmod = 1; /* mark it modified */
946 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */
947 }
948 mp->mnt_data = ump;
949 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
950 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
951 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
952 MNT_ILOCK(mp);
953 mp->mnt_flag |= MNT_LOCAL;
954 MNT_IUNLOCK(mp);
955 ump->um_mountp = mp;
956 ump->um_dev = dev;
957 ump->um_devvp = devvp;
958 ump->um_bo = &devvp->v_bufobj;
959 ump->um_cp = cp;
960
961 /*
962 * Setting those two parameters allowed us to use
963 * ufs_bmap w/o changse!
964 */
965 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
966 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1;
967 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
968 if (ronly == 0)
969 ext2_sbupdate(ump, MNT_WAIT);
970 /*
971 * Initialize filesystem stat information in mount struct.
972 */
973 MNT_ILOCK(mp);
974 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED |
975 MNTK_USES_BCACHE;
976 MNT_IUNLOCK(mp);
977 return (0);
978 out:
979 if (bp)
980 brelse(bp);
981 if (cp != NULL) {
982 g_topology_lock();
983 g_vfs_close(cp);
984 g_topology_unlock();
985 }
986 if (ump) {
987 mtx_destroy(EXT2_MTX(ump));
988 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT);
989 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT);
990 free(ump->um_e2fs->e2fs, M_EXT2MNT);
991 free(ump->um_e2fs, M_EXT2MNT);
992 free(ump, M_EXT2MNT);
993 mp->mnt_data = NULL;
994 }
995 return (error);
996 }
997
998 /*
999 * Unmount system call.
1000 */
1001 static int
1002 ext2_unmount(struct mount *mp, int mntflags)
1003 {
1004 struct ext2mount *ump;
1005 struct m_ext2fs *fs;
1006 struct csum *sump;
1007 int error, flags, i, ronly;
1008
1009 flags = 0;
1010 if (mntflags & MNT_FORCE) {
1011 if (mp->mnt_flag & MNT_ROOTFS)
1012 return (EINVAL);
1013 flags |= FORCECLOSE;
1014 }
1015 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0)
1016 return (error);
1017 ump = VFSTOEXT2(mp);
1018 fs = ump->um_e2fs;
1019 ronly = fs->e2fs_ronly;
1020 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) {
1021 if (fs->e2fs_wasvalid)
1022 fs->e2fs->e2fs_state |= E2FS_ISCLEAN;
1023 ext2_sbupdate(ump, MNT_WAIT);
1024 }
1025
1026 g_topology_lock();
1027 g_vfs_close(ump->um_cp);
1028 g_topology_unlock();
1029 vrele(ump->um_devvp);
1030 sump = fs->e2fs_clustersum;
1031 for (i = 0; i < fs->e2fs_gcount; i++, sump++)
1032 free(sump->cs_sum, M_EXT2MNT);
1033 free(fs->e2fs_clustersum, M_EXT2MNT);
1034 free(fs->e2fs_maxcluster, M_EXT2MNT);
1035 free(fs->e2fs_gd, M_EXT2MNT);
1036 free(fs->e2fs_contigdirs, M_EXT2MNT);
1037 free(fs->e2fs, M_EXT2MNT);
1038 free(fs, M_EXT2MNT);
1039 free(ump, M_EXT2MNT);
1040 mp->mnt_data = NULL;
1041 MNT_ILOCK(mp);
1042 mp->mnt_flag &= ~MNT_LOCAL;
1043 MNT_IUNLOCK(mp);
1044 return (error);
1045 }
1046
1047 /*
1048 * Flush out all the files in a filesystem.
1049 */
1050 static int
1051 ext2_flushfiles(struct mount *mp, int flags, struct thread *td)
1052 {
1053 int error;
1054
1055 error = vflush(mp, 0, flags, td);
1056 return (error);
1057 }
1058
1059 /*
1060 * Get filesystem statistics.
1061 */
1062 int
1063 ext2_statfs(struct mount *mp, struct statfs *sbp)
1064 {
1065 struct ext2mount *ump;
1066 struct m_ext2fs *fs;
1067 uint32_t overhead, overhead_per_group, ngdb;
1068 int i, ngroups;
1069
1070 ump = VFSTOEXT2(mp);
1071 fs = ump->um_e2fs;
1072 if (fs->e2fs->e2fs_magic != E2FS_MAGIC)
1073 panic("ext2_statfs");
1074
1075 /*
1076 * Compute the overhead (FS structures)
1077 */
1078 overhead_per_group =
1079 1 /* block bitmap */ +
1080 1 /* inode bitmap */ +
1081 fs->e2fs_itpg;
1082 overhead = fs->e2fs->e2fs_first_dblock +
1083 fs->e2fs_gcount * overhead_per_group;
1084 if (fs->e2fs->e2fs_rev > E2FS_REV0 &&
1085 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) {
1086 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) {
1087 if (ext2_cg_has_sb(fs, i))
1088 ngroups++;
1089 }
1090 } else {
1091 ngroups = fs->e2fs_gcount;
1092 }
1093 ngdb = fs->e2fs_gdbcount;
1094 if (fs->e2fs->e2fs_rev > E2FS_REV0 &&
1095 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE)
1096 ngdb += fs->e2fs->e2fs_reserved_ngdb;
1097 overhead += ngroups * (1 /* superblock */ + ngdb);
1098
1099 sbp->f_bsize = EXT2_FRAG_SIZE(fs);
1100 sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
1101 sbp->f_blocks = fs->e2fs_bcount - overhead;
1102 sbp->f_bfree = fs->e2fs_fbcount;
1103 sbp->f_bavail = sbp->f_bfree - fs->e2fs_rbcount;
1104 sbp->f_files = fs->e2fs->e2fs_icount;
1105 sbp->f_ffree = fs->e2fs->e2fs_ficount;
1106 return (0);
1107 }
1108
1109 /*
1110 * Go through the disk queues to initiate sandbagged IO;
1111 * go through the inodes to write those that have been modified;
1112 * initiate the writing of the super block if it has been modified.
1113 *
1114 * Note: we are always called with the filesystem marked `MPBUSY'.
1115 */
1116 static int
1117 ext2_sync(struct mount *mp, int waitfor)
1118 {
1119 struct vnode *mvp, *vp;
1120 struct thread *td;
1121 struct inode *ip;
1122 struct ext2mount *ump = VFSTOEXT2(mp);
1123 struct m_ext2fs *fs;
1124 int error, allerror = 0;
1125
1126 td = curthread;
1127 fs = ump->um_e2fs;
1128 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */
1129 panic("ext2_sync: rofs mod fs=%s", fs->e2fs_fsmnt);
1130 }
1131
1132 /*
1133 * Write back each (modified) inode.
1134 */
1135 loop:
1136 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
1137 if (vp->v_type == VNON) {
1138 VI_UNLOCK(vp);
1139 continue;
1140 }
1141 ip = VTOI(vp);
1142 if ((ip->i_flag &
1143 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
1144 (vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
1145 waitfor == MNT_LAZY)) {
1146 VI_UNLOCK(vp);
1147 continue;
1148 }
1149 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td);
1150 if (error) {
1151 if (error == ENOENT) {
1152 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
1153 goto loop;
1154 }
1155 continue;
1156 }
1157 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0)
1158 allerror = error;
1159 VOP_UNLOCK(vp, 0);
1160 vrele(vp);
1161 }
1162
1163 /*
1164 * Force stale filesystem control information to be flushed.
1165 */
1166 if (waitfor != MNT_LAZY) {
1167 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
1168 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
1169 allerror = error;
1170 VOP_UNLOCK(ump->um_devvp, 0);
1171 }
1172
1173 /*
1174 * Write back modified superblock.
1175 */
1176 if (fs->e2fs_fmod != 0) {
1177 fs->e2fs_fmod = 0;
1178 fs->e2fs->e2fs_wtime = time_second;
1179 if ((error = ext2_cgupdate(ump, waitfor)) != 0)
1180 allerror = error;
1181 }
1182 return (allerror);
1183 }
1184
1185 /*
1186 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it
1187 * in from disk. If it is in core, wait for the lock bit to clear, then
1188 * return the inode locked. Detection and handling of mount points must be
1189 * done by the calling routine.
1190 */
1191 static int
1192 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
1193 {
1194 struct m_ext2fs *fs;
1195 struct inode *ip;
1196 struct ext2mount *ump;
1197 struct buf *bp;
1198 struct vnode *vp;
1199 struct thread *td;
1200 unsigned int i, used_blocks;
1201 int error;
1202
1203 td = curthread;
1204 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL);
1205 if (error || *vpp != NULL)
1206 return (error);
1207
1208 ump = VFSTOEXT2(mp);
1209 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO);
1210
1211 /* Allocate a new vnode/inode. */
1212 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) {
1213 *vpp = NULL;
1214 free(ip, M_EXT2NODE);
1215 return (error);
1216 }
1217 vp->v_data = ip;
1218 ip->i_vnode = vp;
1219 ip->i_e2fs = fs = ump->um_e2fs;
1220 ip->i_ump = ump;
1221 ip->i_number = ino;
1222
1223 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
1224 error = insmntque(vp, mp);
1225 if (error != 0) {
1226 free(ip, M_EXT2NODE);
1227 *vpp = NULL;
1228 return (error);
1229 }
1230 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
1231 if (error || *vpp != NULL)
1232 return (error);
1233
1234 /* Read in the disk contents for the inode, copy into the inode. */
1235 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
1236 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
1237 /*
1238 * The inode does not contain anything useful, so it would
1239 * be misleading to leave it on its hash chain. With mode
1240 * still zero, it will be unlinked and returned to the free
1241 * list by vput().
1242 */
1243 brelse(bp);
1244 vput(vp);
1245 *vpp = NULL;
1246 return (error);
1247 }
1248 /* convert ext2 inode to dinode */
1249 error = ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data +
1250 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ino)), ip);
1251 if (error) {
1252 brelse(bp);
1253 vput(vp);
1254 *vpp = NULL;
1255 return (error);
1256 }
1257 ip->i_block_group = ino_to_cg(fs, ino);
1258 ip->i_next_alloc_block = 0;
1259 ip->i_next_alloc_goal = 0;
1260
1261 /*
1262 * Now we want to make sure that block pointers for unused
1263 * blocks are zeroed out - ext2_balloc depends on this
1264 * although for regular files and directories only
1265 *
1266 * If IN_E4EXTENTS is enabled, unused blocks are not zeroed
1267 * out because we could corrupt the extent tree.
1268 */
1269 if (!(ip->i_flag & IN_E4EXTENTS) &&
1270 (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) {
1271 used_blocks = howmany(ip->i_size, fs->e2fs_bsize);
1272 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
1273 ip->i_db[i] = 0;
1274 }
1275 #ifdef EXT2FS_PRINT_EXTENTS
1276 ext2_print_inode(ip);
1277 ext4_ext_print_extent_tree_status(ip);
1278 #endif
1279 bqrelse(bp);
1280
1281 /*
1282 * Initialize the vnode from the inode, check for aliases.
1283 * Note that the underlying vnode may have changed.
1284 */
1285 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) {
1286 vput(vp);
1287 *vpp = NULL;
1288 return (error);
1289 }
1290
1291 /*
1292 * Finish inode initialization.
1293 */
1294
1295 *vpp = vp;
1296 return (0);
1297 }
1298
1299 /*
1300 * File handle to vnode
1301 *
1302 * Have to be really careful about stale file handles:
1303 * - check that the inode number is valid
1304 * - call ext2_vget() to get the locked inode
1305 * - check for an unallocated inode (i_mode == 0)
1306 * - check that the given client host has export rights and return
1307 * those rights via. exflagsp and credanonp
1308 */
1309 static int
1310 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
1311 {
1312 struct inode *ip;
1313 struct ufid *ufhp;
1314 struct vnode *nvp;
1315 struct m_ext2fs *fs;
1316 int error;
1317
1318 ufhp = (struct ufid *)fhp;
1319 fs = VFSTOEXT2(mp)->um_e2fs;
1320 if (ufhp->ufid_ino < EXT2_ROOTINO ||
1321 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg)
1322 return (ESTALE);
1323
1324 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
1325 if (error) {
1326 *vpp = NULLVP;
1327 return (error);
1328 }
1329 ip = VTOI(nvp);
1330 if (ip->i_mode == 0 ||
1331 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) {
1332 vput(nvp);
1333 *vpp = NULLVP;
1334 return (ESTALE);
1335 }
1336 *vpp = nvp;
1337 vnode_create_vobject(*vpp, 0, curthread);
1338 return (0);
1339 }
1340
1341 /*
1342 * Write a superblock and associated information back to disk.
1343 */
1344 static int
1345 ext2_sbupdate(struct ext2mount *mp, int waitfor)
1346 {
1347 struct m_ext2fs *fs = mp->um_e2fs;
1348 struct ext2fs *es = fs->e2fs;
1349 struct buf *bp;
1350 int error = 0;
1351
1352 es->e2fs_bcount = fs->e2fs_bcount & 0xffffffff;
1353 es->e2fs_rbcount = fs->e2fs_rbcount & 0xffffffff;
1354 es->e2fs_fbcount = fs->e2fs_fbcount & 0xffffffff;
1355 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) {
1356 es->e4fs_bcount_hi = fs->e2fs_bcount >> 32;
1357 es->e4fs_rbcount_hi = fs->e2fs_rbcount >> 32;
1358 es->e4fs_fbcount_hi = fs->e2fs_fbcount >> 32;
1359 }
1360
1361 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM))
1362 ext2_sb_csum_set(fs);
1363
1364 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0);
1365 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs));
1366 if (waitfor == MNT_WAIT)
1367 error = bwrite(bp);
1368 else
1369 bawrite(bp);
1370
1371 /*
1372 * The buffers for group descriptors, inode bitmaps and block bitmaps
1373 * are not busy at this point and are (hopefully) written by the
1374 * usual sync mechanism. No need to write them here.
1375 */
1376 return (error);
1377 }
1378 int
1379 ext2_cgupdate(struct ext2mount *mp, int waitfor)
1380 {
1381 struct m_ext2fs *fs = mp->um_e2fs;
1382 struct buf *bp;
1383 int i, j, g_count = 0, error = 0, allerror = 0;
1384
1385 allerror = ext2_sbupdate(mp, waitfor);
1386
1387 /* Update gd csums */
1388 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) ||
1389 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM))
1390 ext2_gd_csum_set(fs);
1391
1392 for (i = 0; i < fs->e2fs_gdbcount; i++) {
1393 bp = getblk(mp->um_devvp, fsbtodb(fs,
1394 ext2_cg_location(fs, i)),
1395 fs->e2fs_bsize, 0, 0, 0);
1396 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) {
1397 memcpy(bp->b_data, &fs->e2fs_gd[
1398 i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
1399 fs->e2fs_bsize);
1400 } else {
1401 for (j = 0; j < fs->e2fs_bsize / E2FS_REV0_GD_SIZE &&
1402 g_count < fs->e2fs_gcount; j++, g_count++)
1403 memcpy(bp->b_data + j * E2FS_REV0_GD_SIZE,
1404 &fs->e2fs_gd[g_count], E2FS_REV0_GD_SIZE);
1405 }
1406 if (waitfor == MNT_WAIT)
1407 error = bwrite(bp);
1408 else
1409 bawrite(bp);
1410 }
1411
1412 if (!allerror && error)
1413 allerror = error;
1414 return (allerror);
1415 }
1416
1417 /*
1418 * Return the root of a filesystem.
1419 */
1420 static int
1421 ext2_root(struct mount *mp, int flags, struct vnode **vpp)
1422 {
1423 struct vnode *nvp;
1424 int error;
1425
1426 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp);
1427 if (error)
1428 return (error);
1429 *vpp = nvp;
1430 return (0);
1431 }
Cache object: 036be18147c4584692548a0d1d577181
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