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 * Copyright (c) 1989, 1991, 1993, 1994
9 * The Regents of the University of California. All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * @(#)ffs_vfsops.c 8.8 (Berkeley) 4/18/94
36 * $FreeBSD: releng/10.2/sys/fs/ext2fs/ext2_vfsops.c 282270 2015-04-30 12:39:24Z rmacklem $
37 */
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/namei.h>
42 #include <sys/priv.h>
43 #include <sys/proc.h>
44 #include <sys/kernel.h>
45 #include <sys/vnode.h>
46 #include <sys/mount.h>
47 #include <sys/bio.h>
48 #include <sys/buf.h>
49 #include <sys/conf.h>
50 #include <sys/endian.h>
51 #include <sys/fcntl.h>
52 #include <sys/malloc.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/ext2_mount.h>
60 #include <fs/ext2fs/inode.h>
61
62 #include <fs/ext2fs/fs.h>
63 #include <fs/ext2fs/ext2fs.h>
64 #include <fs/ext2fs/ext2_dinode.h>
65 #include <fs/ext2fs/ext2_extern.h>
66
67 static int ext2_flushfiles(struct mount *mp, int flags, struct thread *td);
68 static int ext2_mountfs(struct vnode *, struct mount *);
69 static int ext2_reload(struct mount *mp, struct thread *td);
70 static int ext2_sbupdate(struct ext2mount *, int);
71 static int ext2_cgupdate(struct ext2mount *, int);
72 static vfs_unmount_t ext2_unmount;
73 static vfs_root_t ext2_root;
74 static vfs_statfs_t ext2_statfs;
75 static vfs_sync_t ext2_sync;
76 static vfs_vget_t ext2_vget;
77 static vfs_fhtovp_t ext2_fhtovp;
78 static vfs_mount_t ext2_mount;
79
80 MALLOC_DEFINE(M_EXT2NODE, "ext2_node", "EXT2 vnode private part");
81 static MALLOC_DEFINE(M_EXT2MNT, "ext2_mount", "EXT2 mount structure");
82
83 static struct vfsops ext2fs_vfsops = {
84 .vfs_fhtovp = ext2_fhtovp,
85 .vfs_mount = ext2_mount,
86 .vfs_root = ext2_root, /* root inode via vget */
87 .vfs_statfs = ext2_statfs,
88 .vfs_sync = ext2_sync,
89 .vfs_unmount = ext2_unmount,
90 .vfs_vget = ext2_vget,
91 };
92
93 VFS_SET(ext2fs_vfsops, ext2fs, 0);
94
95 static int ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev,
96 int ronly);
97 static int compute_sb_data(struct vnode * devvp,
98 struct ext2fs * es, struct m_ext2fs * fs);
99
100 static const char *ext2_opts[] = { "acls", "async", "noatime", "noclusterr",
101 "noclusterw", "noexec", "export", "force", "from", "multilabel",
102 "suiddir", "nosymfollow", "sync", "union", NULL };
103
104 /*
105 * VFS Operations.
106 *
107 * mount system call
108 */
109 static int
110 ext2_mount(struct mount *mp)
111 {
112 struct vfsoptlist *opts;
113 struct vnode *devvp;
114 struct thread *td;
115 struct ext2mount *ump = NULL;
116 struct m_ext2fs *fs;
117 struct nameidata nd, *ndp = &nd;
118 accmode_t accmode;
119 char *path, *fspec;
120 int error, flags, len;
121
122 td = curthread;
123 opts = mp->mnt_optnew;
124
125 if (vfs_filteropt(opts, ext2_opts))
126 return (EINVAL);
127
128 vfs_getopt(opts, "fspath", (void **)&path, NULL);
129 /* Double-check the length of path.. */
130 if (strlen(path) >= MAXMNTLEN)
131 return (ENAMETOOLONG);
132
133 fspec = NULL;
134 error = vfs_getopt(opts, "from", (void **)&fspec, &len);
135 if (!error && fspec[len - 1] != '\0')
136 return (EINVAL);
137
138 /*
139 * If updating, check whether changing from read-only to
140 * read/write; if there is no device name, that's all we do.
141 */
142 if (mp->mnt_flag & MNT_UPDATE) {
143 ump = VFSTOEXT2(mp);
144 fs = ump->um_e2fs;
145 error = 0;
146 if (fs->e2fs_ronly == 0 &&
147 vfs_flagopt(opts, "ro", NULL, 0)) {
148 error = VFS_SYNC(mp, MNT_WAIT);
149 if (error)
150 return (error);
151 flags = WRITECLOSE;
152 if (mp->mnt_flag & MNT_FORCE)
153 flags |= FORCECLOSE;
154 error = ext2_flushfiles(mp, flags, td);
155 if ( error == 0 && fs->e2fs_wasvalid && ext2_cgupdate(ump, MNT_WAIT) == 0) {
156 fs->e2fs->e2fs_state |= E2FS_ISCLEAN;
157 ext2_sbupdate(ump, MNT_WAIT);
158 }
159 fs->e2fs_ronly = 1;
160 vfs_flagopt(opts, "ro", &mp->mnt_flag, MNT_RDONLY);
161 DROP_GIANT();
162 g_topology_lock();
163 g_access(ump->um_cp, 0, -1, 0);
164 g_topology_unlock();
165 PICKUP_GIANT();
166 }
167 if (!error && (mp->mnt_flag & MNT_RELOAD))
168 error = ext2_reload(mp, td);
169 if (error)
170 return (error);
171 devvp = ump->um_devvp;
172 if (fs->e2fs_ronly && !vfs_flagopt(opts, "ro", NULL, 0)) {
173 if (ext2_check_sb_compat(fs->e2fs, devvp->v_rdev, 0))
174 return (EPERM);
175
176 /*
177 * If upgrade to read-write by non-root, then verify
178 * that user has necessary permissions on the device.
179 */
180 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
181 error = VOP_ACCESS(devvp, VREAD | VWRITE,
182 td->td_ucred, td);
183 if (error)
184 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
185 if (error) {
186 VOP_UNLOCK(devvp, 0);
187 return (error);
188 }
189 VOP_UNLOCK(devvp, 0);
190 DROP_GIANT();
191 g_topology_lock();
192 error = g_access(ump->um_cp, 0, 1, 0);
193 g_topology_unlock();
194 PICKUP_GIANT();
195 if (error)
196 return (error);
197
198 if ((fs->e2fs->e2fs_state & E2FS_ISCLEAN) == 0 ||
199 (fs->e2fs->e2fs_state & E2FS_ERRORS)) {
200 if (mp->mnt_flag & MNT_FORCE) {
201 printf(
202 "WARNING: %s was not properly dismounted\n", fs->e2fs_fsmnt);
203 } else {
204 printf(
205 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
206 fs->e2fs_fsmnt);
207 return (EPERM);
208 }
209 }
210 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN;
211 (void)ext2_cgupdate(ump, MNT_WAIT);
212 fs->e2fs_ronly = 0;
213 MNT_ILOCK(mp);
214 mp->mnt_flag &= ~MNT_RDONLY;
215 MNT_IUNLOCK(mp);
216 }
217 if (vfs_flagopt(opts, "export", NULL, 0)) {
218 /* Process export requests in vfs_mount.c. */
219 return (error);
220 }
221 }
222
223 /*
224 * Not an update, or updating the name: look up the name
225 * and verify that it refers to a sensible disk device.
226 */
227 if (fspec == NULL)
228 return (EINVAL);
229 NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td);
230 if ((error = namei(ndp)) != 0)
231 return (error);
232 NDFREE(ndp, NDF_ONLY_PNBUF);
233 devvp = ndp->ni_vp;
234
235 if (!vn_isdisk(devvp, &error)) {
236 vput(devvp);
237 return (error);
238 }
239
240 /*
241 * If mount by non-root, then verify that user has necessary
242 * permissions on the device.
243 *
244 * XXXRW: VOP_ACCESS() enough?
245 */
246 accmode = VREAD;
247 if ((mp->mnt_flag & MNT_RDONLY) == 0)
248 accmode |= VWRITE;
249 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td);
250 if (error)
251 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
252 if (error) {
253 vput(devvp);
254 return (error);
255 }
256
257 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
258 error = ext2_mountfs(devvp, mp);
259 } else {
260 if (devvp != ump->um_devvp) {
261 vput(devvp);
262 return (EINVAL); /* needs translation */
263 } else
264 vput(devvp);
265 }
266 if (error) {
267 vrele(devvp);
268 return (error);
269 }
270 ump = VFSTOEXT2(mp);
271 fs = ump->um_e2fs;
272
273 /*
274 * Note that this strncpy() is ok because of a check at the start
275 * of ext2_mount().
276 */
277 strncpy(fs->e2fs_fsmnt, path, MAXMNTLEN);
278 fs->e2fs_fsmnt[MAXMNTLEN - 1] = '\0';
279 vfs_mountedfrom(mp, fspec);
280 return (0);
281 }
282
283 static int
284 ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, int ronly)
285 {
286
287 if (es->e2fs_magic != E2FS_MAGIC) {
288 printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n",
289 devtoname(dev), es->e2fs_magic, E2FS_MAGIC);
290 return (1);
291 }
292 if (es->e2fs_rev > E2FS_REV0) {
293 if (es->e2fs_features_incompat & ~(EXT2F_INCOMPAT_SUPP |
294 EXT4F_RO_INCOMPAT_SUPP)) {
295 printf(
296 "WARNING: mount of %s denied due to unsupported optional features\n",
297 devtoname(dev));
298 return (1);
299 }
300 if (!ronly &&
301 (es->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP)) {
302 printf("WARNING: R/W mount of %s denied due to "
303 "unsupported optional features\n", devtoname(dev));
304 return (1);
305 }
306 }
307 return (0);
308 }
309
310 /*
311 * This computes the fields of the ext2_sb_info structure from the
312 * data in the ext2_super_block structure read in.
313 */
314 static int
315 compute_sb_data(struct vnode *devvp, struct ext2fs *es,
316 struct m_ext2fs *fs)
317 {
318 int db_count, error;
319 int i;
320 int logic_sb_block = 1; /* XXX for now */
321 struct buf *bp;
322 uint32_t e2fs_descpb;
323
324 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize;
325 fs->e2fs_bsize = 1U << fs->e2fs_bshift;
326 fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1;
327 fs->e2fs_qbmask = fs->e2fs_bsize - 1;
328 fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << es->e2fs_log_fsize;
329 if (fs->e2fs_fsize)
330 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize;
331 fs->e2fs_bpg = es->e2fs_bpg;
332 fs->e2fs_fpg = es->e2fs_fpg;
333 fs->e2fs_ipg = es->e2fs_ipg;
334 if (es->e2fs_rev == E2FS_REV0) {
335 fs->e2fs_isize = E2FS_REV0_INODE_SIZE ;
336 } else {
337 fs->e2fs_isize = es->e2fs_inode_size;
338
339 /*
340 * Simple sanity check for superblock inode size value.
341 */
342 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE ||
343 EXT2_INODE_SIZE(fs) > fs->e2fs_bsize ||
344 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) {
345 printf("ext2fs: invalid inode size %d\n",
346 fs->e2fs_isize);
347 return (EIO);
348 }
349 }
350 /* Check for extra isize in big inodes. */
351 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) &&
352 EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) {
353 printf("ext2fs: no space for extra inode timestamps\n");
354 return (EINVAL);
355 }
356
357 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs);
358 fs->e2fs_itpg = fs->e2fs_ipg / fs->e2fs_ipb;
359 /* s_resuid / s_resgid ? */
360 fs->e2fs_gcount = (es->e2fs_bcount - es->e2fs_first_dblock +
361 EXT2_BLOCKS_PER_GROUP(fs) - 1) / EXT2_BLOCKS_PER_GROUP(fs);
362 e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd);
363 db_count = (fs->e2fs_gcount + e2fs_descpb - 1) / e2fs_descpb;
364 fs->e2fs_gdbcount = db_count;
365 fs->e2fs_gd = malloc(db_count * fs->e2fs_bsize,
366 M_EXT2MNT, M_WAITOK);
367 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount *
368 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK | M_ZERO);
369
370 /*
371 * Adjust logic_sb_block.
372 * Godmar thinks: if the blocksize is greater than 1024, then
373 * the superblock is logically part of block zero.
374 */
375 if(fs->e2fs_bsize > SBSIZE)
376 logic_sb_block = 0;
377 for (i = 0; i < db_count; i++) {
378 error = bread(devvp ,
379 fsbtodb(fs, logic_sb_block + i + 1 ),
380 fs->e2fs_bsize, NOCRED, &bp);
381 if (error) {
382 free(fs->e2fs_contigdirs, M_EXT2MNT);
383 free(fs->e2fs_gd, M_EXT2MNT);
384 brelse(bp);
385 return (error);
386 }
387 e2fs_cgload((struct ext2_gd *)bp->b_data,
388 &fs->e2fs_gd[
389 i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
390 fs->e2fs_bsize);
391 brelse(bp);
392 bp = NULL;
393 }
394 /* Initialization for the ext2 Orlov allocator variant. */
395 fs->e2fs_total_dir = 0;
396 for (i = 0; i < fs->e2fs_gcount; i++)
397 fs->e2fs_total_dir += fs->e2fs_gd[i].ext2bgd_ndirs;
398
399 if (es->e2fs_rev == E2FS_REV0 ||
400 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE))
401 fs->e2fs_maxfilesize = 0x7fffffff;
402 else
403 fs->e2fs_maxfilesize = 0x7fffffffffffffff;
404 return (0);
405 }
406
407 /*
408 * Reload all incore data for a filesystem (used after running fsck on
409 * the root filesystem and finding things to fix). The filesystem must
410 * be mounted read-only.
411 *
412 * Things to do to update the mount:
413 * 1) invalidate all cached meta-data.
414 * 2) re-read superblock from disk.
415 * 3) invalidate all cluster summary information.
416 * 4) invalidate all inactive vnodes.
417 * 5) invalidate all cached file data.
418 * 6) re-read inode data for all active vnodes.
419 * XXX we are missing some steps, in particular # 3, this has to be reviewed.
420 */
421 static int
422 ext2_reload(struct mount *mp, struct thread *td)
423 {
424 struct vnode *vp, *mvp, *devvp;
425 struct inode *ip;
426 struct buf *bp;
427 struct ext2fs *es;
428 struct m_ext2fs *fs;
429 struct csum *sump;
430 int error, i;
431 int32_t *lp;
432
433 if ((mp->mnt_flag & MNT_RDONLY) == 0)
434 return (EINVAL);
435 /*
436 * Step 1: invalidate all cached meta-data.
437 */
438 devvp = VFSTOEXT2(mp)->um_devvp;
439 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
440 if (vinvalbuf(devvp, 0, 0, 0) != 0)
441 panic("ext2_reload: dirty1");
442 VOP_UNLOCK(devvp, 0);
443
444 /*
445 * Step 2: re-read superblock from disk.
446 * constants have been adjusted for ext2
447 */
448 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
449 return (error);
450 es = (struct ext2fs *)bp->b_data;
451 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
452 brelse(bp);
453 return (EIO); /* XXX needs translation */
454 }
455 fs = VFSTOEXT2(mp)->um_e2fs;
456 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs));
457
458 if((error = compute_sb_data(devvp, es, fs)) != 0) {
459 brelse(bp);
460 return (error);
461 }
462 #ifdef UNKLAR
463 if (fs->fs_sbsize < SBSIZE)
464 bp->b_flags |= B_INVAL;
465 #endif
466 brelse(bp);
467
468 /*
469 * Step 3: invalidate all cluster summary information.
470 */
471 if (fs->e2fs_contigsumsize > 0) {
472 lp = fs->e2fs_maxcluster;
473 sump = fs->e2fs_clustersum;
474 for (i = 0; i < fs->e2fs_gcount; i++, sump++) {
475 *lp++ = fs->e2fs_contigsumsize;
476 sump->cs_init = 0;
477 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1);
478 }
479 }
480
481 loop:
482 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
483 /*
484 * Step 4: invalidate all cached file data.
485 */
486 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
487 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
488 goto loop;
489 }
490 if (vinvalbuf(vp, 0, 0, 0))
491 panic("ext2_reload: dirty2");
492
493 /*
494 * Step 5: re-read inode data for all active vnodes.
495 */
496 ip = VTOI(vp);
497 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
498 (int)fs->e2fs_bsize, NOCRED, &bp);
499 if (error) {
500 VOP_UNLOCK(vp, 0);
501 vrele(vp);
502 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
503 return (error);
504 }
505 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data +
506 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip);
507 brelse(bp);
508 VOP_UNLOCK(vp, 0);
509 vrele(vp);
510 }
511 return (0);
512 }
513
514 /*
515 * Common code for mount and mountroot.
516 */
517 static int
518 ext2_mountfs(struct vnode *devvp, struct mount *mp)
519 {
520 struct ext2mount *ump;
521 struct buf *bp;
522 struct m_ext2fs *fs;
523 struct ext2fs *es;
524 struct cdev *dev = devvp->v_rdev;
525 struct g_consumer *cp;
526 struct bufobj *bo;
527 struct csum *sump;
528 int error;
529 int ronly;
530 int i, size;
531 int32_t *lp;
532 int32_t e2fs_maxcontig;
533
534 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0);
535 /* XXX: use VOP_ACESS to check FS perms */
536 DROP_GIANT();
537 g_topology_lock();
538 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1);
539 g_topology_unlock();
540 PICKUP_GIANT();
541 VOP_UNLOCK(devvp, 0);
542 if (error)
543 return (error);
544
545 /* XXX: should we check for some sectorsize or 512 instead? */
546 if (((SBSIZE % cp->provider->sectorsize) != 0) ||
547 (SBSIZE < cp->provider->sectorsize)) {
548 DROP_GIANT();
549 g_topology_lock();
550 g_vfs_close(cp);
551 g_topology_unlock();
552 PICKUP_GIANT();
553 return (EINVAL);
554 }
555
556 bo = &devvp->v_bufobj;
557 bo->bo_private = cp;
558 bo->bo_ops = g_vfs_bufops;
559 if (devvp->v_rdev->si_iosize_max != 0)
560 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
561 if (mp->mnt_iosize_max > MAXPHYS)
562 mp->mnt_iosize_max = MAXPHYS;
563
564 bp = NULL;
565 ump = NULL;
566 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
567 goto out;
568 es = (struct ext2fs *)bp->b_data;
569 if (ext2_check_sb_compat(es, dev, ronly) != 0) {
570 error = EINVAL; /* XXX needs translation */
571 goto out;
572 }
573 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 ||
574 (es->e2fs_state & E2FS_ERRORS)) {
575 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
576 printf(
577 "WARNING: Filesystem was not properly dismounted\n");
578 } else {
579 printf(
580 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n");
581 error = EPERM;
582 goto out;
583 }
584 }
585 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO);
586
587 /*
588 * I don't know whether this is the right strategy. Note that
589 * we dynamically allocate both an ext2_sb_info and an ext2_super_block
590 * while Linux keeps the super block in a locked buffer.
591 */
592 ump->um_e2fs = malloc(sizeof(struct m_ext2fs),
593 M_EXT2MNT, M_WAITOK);
594 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs),
595 M_EXT2MNT, M_WAITOK);
596 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF);
597 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs));
598 if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs)))
599 goto out;
600
601 /*
602 * Calculate the maximum contiguous blocks and size of cluster summary
603 * array. In FFS this is done by newfs; however, the superblock
604 * in ext2fs doesn't have these variables, so we can calculate
605 * them here.
606 */
607 e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize);
608 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG);
609 if (ump->um_e2fs->e2fs_contigsumsize > 0) {
610 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t);
611 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK);
612 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum);
613 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK);
614 lp = ump->um_e2fs->e2fs_maxcluster;
615 sump = ump->um_e2fs->e2fs_clustersum;
616 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) {
617 *lp++ = ump->um_e2fs->e2fs_contigsumsize;
618 sump->cs_init = 0;
619 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) *
620 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO);
621 }
622 }
623
624 brelse(bp);
625 bp = NULL;
626 fs = ump->um_e2fs;
627 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */
628
629 /*
630 * If the fs is not mounted read-only, make sure the super block is
631 * always written back on a sync().
632 */
633 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0;
634 if (ronly == 0) {
635 fs->e2fs_fmod = 1; /* mark it modified */
636 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */
637 }
638 mp->mnt_data = ump;
639 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
640 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
641 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
642 MNT_ILOCK(mp);
643 mp->mnt_flag |= MNT_LOCAL;
644 MNT_IUNLOCK(mp);
645 ump->um_mountp = mp;
646 ump->um_dev = dev;
647 ump->um_devvp = devvp;
648 ump->um_bo = &devvp->v_bufobj;
649 ump->um_cp = cp;
650
651 /*
652 * Setting those two parameters allowed us to use
653 * ufs_bmap w/o changse!
654 */
655 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
656 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1;
657 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
658 if (ronly == 0)
659 ext2_sbupdate(ump, MNT_WAIT);
660 /*
661 * Initialize filesystem stat information in mount struct.
662 */
663 MNT_ILOCK(mp);
664 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED |
665 MNTK_USES_BCACHE;
666 MNT_IUNLOCK(mp);
667 return (0);
668 out:
669 if (bp)
670 brelse(bp);
671 if (cp != NULL) {
672 DROP_GIANT();
673 g_topology_lock();
674 g_vfs_close(cp);
675 g_topology_unlock();
676 PICKUP_GIANT();
677 }
678 if (ump) {
679 mtx_destroy(EXT2_MTX(ump));
680 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT);
681 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT);
682 free(ump->um_e2fs->e2fs, M_EXT2MNT);
683 free(ump->um_e2fs, M_EXT2MNT);
684 free(ump, M_EXT2MNT);
685 mp->mnt_data = NULL;
686 }
687 return (error);
688 }
689
690 /*
691 * Unmount system call.
692 */
693 static int
694 ext2_unmount(struct mount *mp, int mntflags)
695 {
696 struct ext2mount *ump;
697 struct m_ext2fs *fs;
698 struct csum *sump;
699 int error, flags, i, ronly;
700
701 flags = 0;
702 if (mntflags & MNT_FORCE) {
703 if (mp->mnt_flag & MNT_ROOTFS)
704 return (EINVAL);
705 flags |= FORCECLOSE;
706 }
707 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0)
708 return (error);
709 ump = VFSTOEXT2(mp);
710 fs = ump->um_e2fs;
711 ronly = fs->e2fs_ronly;
712 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) {
713 if (fs->e2fs_wasvalid)
714 fs->e2fs->e2fs_state |= E2FS_ISCLEAN;
715 ext2_sbupdate(ump, MNT_WAIT);
716 }
717
718 DROP_GIANT();
719 g_topology_lock();
720 g_vfs_close(ump->um_cp);
721 g_topology_unlock();
722 PICKUP_GIANT();
723 vrele(ump->um_devvp);
724 sump = fs->e2fs_clustersum;
725 for (i = 0; i < fs->e2fs_gcount; i++, sump++)
726 free(sump->cs_sum, M_EXT2MNT);
727 free(fs->e2fs_clustersum, M_EXT2MNT);
728 free(fs->e2fs_maxcluster, M_EXT2MNT);
729 free(fs->e2fs_gd, M_EXT2MNT);
730 free(fs->e2fs_contigdirs, M_EXT2MNT);
731 free(fs->e2fs, M_EXT2MNT);
732 free(fs, M_EXT2MNT);
733 free(ump, M_EXT2MNT);
734 mp->mnt_data = NULL;
735 MNT_ILOCK(mp);
736 mp->mnt_flag &= ~MNT_LOCAL;
737 MNT_IUNLOCK(mp);
738 return (error);
739 }
740
741 /*
742 * Flush out all the files in a filesystem.
743 */
744 static int
745 ext2_flushfiles(struct mount *mp, int flags, struct thread *td)
746 {
747 int error;
748
749 error = vflush(mp, 0, flags, td);
750 return (error);
751 }
752 /*
753 * Get filesystem statistics.
754 */
755 int
756 ext2_statfs(struct mount *mp, struct statfs *sbp)
757 {
758 struct ext2mount *ump;
759 struct m_ext2fs *fs;
760 uint32_t overhead, overhead_per_group, ngdb;
761 int i, ngroups;
762
763 ump = VFSTOEXT2(mp);
764 fs = ump->um_e2fs;
765 if (fs->e2fs->e2fs_magic != E2FS_MAGIC)
766 panic("ext2_statfs");
767
768 /*
769 * Compute the overhead (FS structures)
770 */
771 overhead_per_group =
772 1 /* block bitmap */ +
773 1 /* inode bitmap */ +
774 fs->e2fs_itpg;
775 overhead = fs->e2fs->e2fs_first_dblock +
776 fs->e2fs_gcount * overhead_per_group;
777 if (fs->e2fs->e2fs_rev > E2FS_REV0 &&
778 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) {
779 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) {
780 if (cg_has_sb(i))
781 ngroups++;
782 }
783 } else {
784 ngroups = fs->e2fs_gcount;
785 }
786 ngdb = fs->e2fs_gdbcount;
787 if (fs->e2fs->e2fs_rev > E2FS_REV0 &&
788 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE)
789 ngdb += fs->e2fs->e2fs_reserved_ngdb;
790 overhead += ngroups * (1 /* superblock */ + ngdb);
791
792 sbp->f_bsize = EXT2_FRAG_SIZE(fs);
793 sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
794 sbp->f_blocks = fs->e2fs->e2fs_bcount - overhead;
795 sbp->f_bfree = fs->e2fs->e2fs_fbcount;
796 sbp->f_bavail = sbp->f_bfree - fs->e2fs->e2fs_rbcount;
797 sbp->f_files = fs->e2fs->e2fs_icount;
798 sbp->f_ffree = fs->e2fs->e2fs_ficount;
799 return (0);
800 }
801
802 /*
803 * Go through the disk queues to initiate sandbagged IO;
804 * go through the inodes to write those that have been modified;
805 * initiate the writing of the super block if it has been modified.
806 *
807 * Note: we are always called with the filesystem marked `MPBUSY'.
808 */
809 static int
810 ext2_sync(struct mount *mp, int waitfor)
811 {
812 struct vnode *mvp, *vp;
813 struct thread *td;
814 struct inode *ip;
815 struct ext2mount *ump = VFSTOEXT2(mp);
816 struct m_ext2fs *fs;
817 int error, allerror = 0;
818
819 td = curthread;
820 fs = ump->um_e2fs;
821 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */
822 printf("fs = %s\n", fs->e2fs_fsmnt);
823 panic("ext2_sync: rofs mod");
824 }
825
826 /*
827 * Write back each (modified) inode.
828 */
829 loop:
830 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
831 if (vp->v_type == VNON) {
832 VI_UNLOCK(vp);
833 continue;
834 }
835 ip = VTOI(vp);
836 if ((ip->i_flag &
837 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
838 (vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
839 waitfor == MNT_LAZY)) {
840 VI_UNLOCK(vp);
841 continue;
842 }
843 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td);
844 if (error) {
845 if (error == ENOENT) {
846 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
847 goto loop;
848 }
849 continue;
850 }
851 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0)
852 allerror = error;
853 VOP_UNLOCK(vp, 0);
854 vrele(vp);
855 }
856
857 /*
858 * Force stale filesystem control information to be flushed.
859 */
860 if (waitfor != MNT_LAZY) {
861 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
862 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
863 allerror = error;
864 VOP_UNLOCK(ump->um_devvp, 0);
865 }
866
867 /*
868 * Write back modified superblock.
869 */
870 if (fs->e2fs_fmod != 0) {
871 fs->e2fs_fmod = 0;
872 fs->e2fs->e2fs_wtime = time_second;
873 if ((error = ext2_cgupdate(ump, waitfor)) != 0)
874 allerror = error;
875 }
876 return (allerror);
877 }
878
879 /*
880 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it
881 * in from disk. If it is in core, wait for the lock bit to clear, then
882 * return the inode locked. Detection and handling of mount points must be
883 * done by the calling routine.
884 */
885 static int
886 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
887 {
888 struct m_ext2fs *fs;
889 struct inode *ip;
890 struct ext2mount *ump;
891 struct buf *bp;
892 struct vnode *vp;
893 struct thread *td;
894 int i, error;
895 int used_blocks;
896
897 td = curthread;
898 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL);
899 if (error || *vpp != NULL)
900 return (error);
901
902 ump = VFSTOEXT2(mp);
903 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO);
904
905 /* Allocate a new vnode/inode. */
906 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) {
907 *vpp = NULL;
908 free(ip, M_EXT2NODE);
909 return (error);
910 }
911 vp->v_data = ip;
912 ip->i_vnode = vp;
913 ip->i_e2fs = fs = ump->um_e2fs;
914 ip->i_ump = ump;
915 ip->i_number = ino;
916
917 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
918 error = insmntque(vp, mp);
919 if (error != 0) {
920 free(ip, M_EXT2NODE);
921 *vpp = NULL;
922 return (error);
923 }
924 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
925 if (error || *vpp != NULL)
926 return (error);
927
928 /* Read in the disk contents for the inode, copy into the inode. */
929 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
930 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
931 /*
932 * The inode does not contain anything useful, so it would
933 * be misleading to leave it on its hash chain. With mode
934 * still zero, it will be unlinked and returned to the free
935 * list by vput().
936 */
937 brelse(bp);
938 vput(vp);
939 *vpp = NULL;
940 return (error);
941 }
942 /* convert ext2 inode to dinode */
943 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) *
944 ino_to_fsbo(fs, ino)), ip);
945 ip->i_block_group = ino_to_cg(fs, ino);
946 ip->i_next_alloc_block = 0;
947 ip->i_next_alloc_goal = 0;
948
949 /*
950 * Now we want to make sure that block pointers for unused
951 * blocks are zeroed out - ext2_balloc depends on this
952 * although for regular files and directories only
953 *
954 * If IN_E4EXTENTS is enabled, unused blocks are not zeroed
955 * out because we could corrupt the extent tree.
956 */
957 if (!(ip->i_flag & IN_E4EXTENTS) &&
958 (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) {
959 used_blocks = (ip->i_size+fs->e2fs_bsize-1) / fs->e2fs_bsize;
960 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
961 ip->i_db[i] = 0;
962 }
963 #ifdef EXT2FS_DEBUG
964 ext2_print_inode(ip);
965 #endif
966 bqrelse(bp);
967
968 /*
969 * Initialize the vnode from the inode, check for aliases.
970 * Note that the underlying vnode may have changed.
971 */
972 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) {
973 vput(vp);
974 *vpp = NULL;
975 return (error);
976 }
977
978 /*
979 * Finish inode initialization.
980 */
981
982 /*
983 * Set up a generation number for this inode if it does not
984 * already have one. This should only happen on old filesystems.
985 */
986 if (ip->i_gen == 0) {
987 ip->i_gen = random() + 1;
988 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
989 ip->i_flag |= IN_MODIFIED;
990 }
991 *vpp = vp;
992 return (0);
993 }
994
995 /*
996 * File handle to vnode
997 *
998 * Have to be really careful about stale file handles:
999 * - check that the inode number is valid
1000 * - call ext2_vget() to get the locked inode
1001 * - check for an unallocated inode (i_mode == 0)
1002 * - check that the given client host has export rights and return
1003 * those rights via. exflagsp and credanonp
1004 */
1005 static int
1006 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
1007 {
1008 struct inode *ip;
1009 struct ufid *ufhp;
1010 struct vnode *nvp;
1011 struct m_ext2fs *fs;
1012 int error;
1013
1014 ufhp = (struct ufid *)fhp;
1015 fs = VFSTOEXT2(mp)->um_e2fs;
1016 if (ufhp->ufid_ino < EXT2_ROOTINO ||
1017 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg)
1018 return (ESTALE);
1019
1020 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
1021 if (error) {
1022 *vpp = NULLVP;
1023 return (error);
1024 }
1025 ip = VTOI(nvp);
1026 if (ip->i_mode == 0 ||
1027 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) {
1028 vput(nvp);
1029 *vpp = NULLVP;
1030 return (ESTALE);
1031 }
1032 *vpp = nvp;
1033 vnode_create_vobject(*vpp, 0, curthread);
1034 return (0);
1035 }
1036
1037 /*
1038 * Write a superblock and associated information back to disk.
1039 */
1040 static int
1041 ext2_sbupdate(struct ext2mount *mp, int waitfor)
1042 {
1043 struct m_ext2fs *fs = mp->um_e2fs;
1044 struct ext2fs *es = fs->e2fs;
1045 struct buf *bp;
1046 int error = 0;
1047
1048 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0);
1049 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs));
1050 if (waitfor == MNT_WAIT)
1051 error = bwrite(bp);
1052 else
1053 bawrite(bp);
1054
1055 /*
1056 * The buffers for group descriptors, inode bitmaps and block bitmaps
1057 * are not busy at this point and are (hopefully) written by the
1058 * usual sync mechanism. No need to write them here.
1059 */
1060 return (error);
1061 }
1062 int
1063 ext2_cgupdate(struct ext2mount *mp, int waitfor)
1064 {
1065 struct m_ext2fs *fs = mp->um_e2fs;
1066 struct buf *bp;
1067 int i, error = 0, allerror = 0;
1068
1069 allerror = ext2_sbupdate(mp, waitfor);
1070 for (i = 0; i < fs->e2fs_gdbcount; i++) {
1071 bp = getblk(mp->um_devvp, fsbtodb(fs,
1072 fs->e2fs->e2fs_first_dblock +
1073 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0);
1074 e2fs_cgsave(&fs->e2fs_gd[
1075 i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
1076 (struct ext2_gd *)bp->b_data, fs->e2fs_bsize);
1077 if (waitfor == MNT_WAIT)
1078 error = bwrite(bp);
1079 else
1080 bawrite(bp);
1081 }
1082
1083 if (!allerror && error)
1084 allerror = error;
1085 return (allerror);
1086 }
1087 /*
1088 * Return the root of a filesystem.
1089 */
1090 static int
1091 ext2_root(struct mount *mp, int flags, struct vnode **vpp)
1092 {
1093 struct vnode *nvp;
1094 int error;
1095
1096 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp);
1097 if (error)
1098 return (error);
1099 *vpp = nvp;
1100 return (0);
1101 }
Cache object: 288eeba56e427b8ec77c1c3c8ece33c7
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