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/9.1/sys/fs/ext2fs/ext2_vfsops.c 235626 2012-05-18 19:48:38Z mckusick $
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 = 0;
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 - 1)
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 printf(
295 "WARNING: mount of %s denied due to unsupported optional features\n",
296 devtoname(dev));
297 return (1);
298 }
299 if (!ronly &&
300 (es->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP)) {
301 printf("WARNING: R/W mount of %s denied due to "
302 "unsupported optional features\n", devtoname(dev));
303 return (1);
304 }
305 }
306 return (0);
307 }
308
309 /*
310 * This computes the fields of the ext2_sb_info structure from the
311 * data in the ext2_super_block structure read in.
312 */
313 static int
314 compute_sb_data(struct vnode *devvp, struct ext2fs *es,
315 struct m_ext2fs *fs)
316 {
317 int db_count, error;
318 int i;
319 int logic_sb_block = 1; /* XXX for now */
320 struct buf *bp;
321
322 fs->e2fs_bsize = EXT2_MIN_BLOCK_SIZE << es->e2fs_log_bsize;
323 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize;
324 fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1;
325 fs->e2fs_qbmask = fs->e2fs_bsize - 1;
326 fs->e2fs_blocksize_bits = es->e2fs_log_bsize + 10;
327 fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << es->e2fs_log_fsize;
328 if (fs->e2fs_fsize)
329 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize;
330 fs->e2fs_bpg = es->e2fs_bpg;
331 fs->e2fs_fpg = es->e2fs_fpg;
332 fs->e2fs_ipg = es->e2fs_ipg;
333 if (es->e2fs_rev == E2FS_REV0) {
334 fs->e2fs_first_inode = EXT2_FIRSTINO;
335 fs->e2fs_isize = E2FS_REV0_INODE_SIZE ;
336 } else {
337 fs->e2fs_first_inode = es->e2fs_first_ino;
338 fs->e2fs_isize = es->e2fs_inode_size;
339
340 /*
341 * Simple sanity check for superblock inode size value.
342 */
343 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE ||
344 EXT2_INODE_SIZE(fs) > fs->e2fs_bsize ||
345 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) {
346 printf("ext2fs: invalid inode size %d\n",
347 fs->e2fs_isize);
348 return (EIO);
349 }
350 }
351 /* Check for extra isize in big inodes. */
352 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT4F_ROCOMPAT_EXTRA_ISIZE) &&
353 EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) {
354 printf("ext2fs: no space for extra inode timestamps\n");
355 return (EINVAL);
356 }
357
358 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs);
359 fs->e2fs_itpg = fs->e2fs_ipg /fs->e2fs_ipb;
360 fs->e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd);
361 /* s_resuid / s_resgid ? */
362 fs->e2fs_gcount = (es->e2fs_bcount - es->e2fs_first_dblock +
363 EXT2_BLOCKS_PER_GROUP(fs) - 1) / EXT2_BLOCKS_PER_GROUP(fs);
364 db_count = (fs->e2fs_gcount + EXT2_DESC_PER_BLOCK(fs) - 1) /
365 EXT2_DESC_PER_BLOCK(fs);
366 fs->e2fs_gdbcount = db_count;
367 fs->e2fs_gd = malloc(db_count * fs->e2fs_bsize,
368 M_EXT2MNT, M_WAITOK);
369 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount *
370 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK);
371
372 /*
373 * Adjust logic_sb_block.
374 * Godmar thinks: if the blocksize is greater than 1024, then
375 * the superblock is logically part of block zero.
376 */
377 if(fs->e2fs_bsize > SBSIZE)
378 logic_sb_block = 0;
379 for (i = 0; i < db_count; i++) {
380 error = bread(devvp ,
381 fsbtodb(fs, logic_sb_block + i + 1 ),
382 fs->e2fs_bsize, NOCRED, &bp);
383 if (error) {
384 free(fs->e2fs_gd, M_EXT2MNT);
385 brelse(bp);
386 return (error);
387 }
388 e2fs_cgload((struct ext2_gd *)bp->b_data,
389 &fs->e2fs_gd[
390 i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
391 fs->e2fs_bsize);
392 brelse(bp);
393 bp = NULL;
394 }
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 fs->e2fs_contigdirs[i] = 0;
399 }
400 if (es->e2fs_rev == E2FS_REV0 ||
401 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE))
402 fs->e2fs_maxfilesize = 0x7fffffff;
403 else
404 fs->e2fs_maxfilesize = 0x7fffffffffffffff;
405 return (0);
406 }
407
408 /*
409 * Reload all incore data for a filesystem (used after running fsck on
410 * the root filesystem and finding things to fix). The filesystem must
411 * be mounted read-only.
412 *
413 * Things to do to update the mount:
414 * 1) invalidate all cached meta-data.
415 * 2) re-read superblock from disk.
416 * 3) invalidate all cluster summary information.
417 * 4) invalidate all inactive vnodes.
418 * 5) invalidate all cached file data.
419 * 6) re-read inode data for all active vnodes.
420 * XXX we are missing some steps, in particular # 3, this has to be reviewed.
421 */
422 static int
423 ext2_reload(struct mount *mp, struct thread *td)
424 {
425 struct vnode *vp, *mvp, *devvp;
426 struct inode *ip;
427 struct buf *bp;
428 struct ext2fs *es;
429 struct m_ext2fs *fs;
430 struct csum *sump;
431 int error, i;
432 int32_t *lp;
433
434 if ((mp->mnt_flag & MNT_RDONLY) == 0)
435 return (EINVAL);
436 /*
437 * Step 1: invalidate all cached meta-data.
438 */
439 devvp = VFSTOEXT2(mp)->um_devvp;
440 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
441 if (vinvalbuf(devvp, 0, 0, 0) != 0)
442 panic("ext2_reload: dirty1");
443 VOP_UNLOCK(devvp, 0);
444
445 /*
446 * Step 2: re-read superblock from disk.
447 * constants have been adjusted for ext2
448 */
449 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
450 return (error);
451 es = (struct ext2fs *)bp->b_data;
452 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
453 brelse(bp);
454 return (EIO); /* XXX needs translation */
455 }
456 fs = VFSTOEXT2(mp)->um_e2fs;
457 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs));
458
459 if((error = compute_sb_data(devvp, es, fs)) != 0) {
460 brelse(bp);
461 return (error);
462 }
463 #ifdef UNKLAR
464 if (fs->fs_sbsize < SBSIZE)
465 bp->b_flags |= B_INVAL;
466 #endif
467 brelse(bp);
468
469 /*
470 * Step 3: invalidate all cluster summary information.
471 */
472 if (fs->e2fs_contigsumsize > 0) {
473 lp = fs->e2fs_maxcluster;
474 sump = fs->e2fs_clustersum;
475 for (i = 0; i < fs->e2fs_gcount; i++, sump++) {
476 *lp++ = fs->e2fs_contigsumsize;
477 sump->cs_init = 0;
478 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1);
479 }
480 }
481
482 loop:
483 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
484 /*
485 * Step 4: invalidate all cached file data.
486 */
487 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
488 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
489 goto loop;
490 }
491 if (vinvalbuf(vp, 0, 0, 0))
492 panic("ext2_reload: dirty2");
493
494 /*
495 * Step 5: re-read inode data for all active vnodes.
496 */
497 ip = VTOI(vp);
498 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
499 (int)fs->e2fs_bsize, NOCRED, &bp);
500 if (error) {
501 VOP_UNLOCK(vp, 0);
502 vrele(vp);
503 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
504 return (error);
505 }
506 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data +
507 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip);
508 brelse(bp);
509 VOP_UNLOCK(vp, 0);
510 vrele(vp);
511 }
512 return (0);
513 }
514
515 /*
516 * Common code for mount and mountroot.
517 */
518 static int
519 ext2_mountfs(struct vnode *devvp, struct mount *mp)
520 {
521 struct ext2mount *ump;
522 struct buf *bp;
523 struct m_ext2fs *fs;
524 struct ext2fs *es;
525 struct cdev *dev = devvp->v_rdev;
526 struct g_consumer *cp;
527 struct bufobj *bo;
528 struct csum *sump;
529 int error;
530 int ronly;
531 int i, size;
532 int32_t *lp;
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 ump->um_e2fs->e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize);
608 if (ump->um_e2fs->e2fs_maxcontig > 0)
609 ump->um_e2fs->e2fs_contigsumsize =
610 MIN(ump->um_e2fs->e2fs_maxcontig, EXT2_MAXCONTIG);
611 else
612 ump->um_e2fs->e2fs_contigsumsize = 0;
613 if (ump->um_e2fs->e2fs_contigsumsize > 0) {
614 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t);
615 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK);
616 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum);
617 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK);
618 lp = ump->um_e2fs->e2fs_maxcluster;
619 sump = ump->um_e2fs->e2fs_clustersum;
620 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) {
621 *lp++ = ump->um_e2fs->e2fs_contigsumsize;
622 sump->cs_init = 0;
623 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) *
624 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO);
625 }
626 }
627
628 brelse(bp);
629 bp = NULL;
630 fs = ump->um_e2fs;
631 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */
632
633 /*
634 * If the fs is not mounted read-only, make sure the super block is
635 * always written back on a sync().
636 */
637 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0;
638 if (ronly == 0) {
639 fs->e2fs_fmod = 1; /* mark it modified */
640 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */
641 }
642 mp->mnt_data = ump;
643 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
644 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
645 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
646 MNT_ILOCK(mp);
647 mp->mnt_flag |= MNT_LOCAL;
648 MNT_IUNLOCK(mp);
649 ump->um_mountp = mp;
650 ump->um_dev = dev;
651 ump->um_devvp = devvp;
652 ump->um_bo = &devvp->v_bufobj;
653 ump->um_cp = cp;
654
655 /*
656 * Setting those two parameters allowed us to use
657 * ufs_bmap w/o changse!
658 */
659 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
660 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1;
661 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
662 if (ronly == 0)
663 ext2_sbupdate(ump, MNT_WAIT);
664 /*
665 * Initialize filesystem stat information in mount struct.
666 */
667 MNT_ILOCK(mp);
668 mp->mnt_kern_flag |= MNTK_MPSAFE | MNTK_LOOKUP_SHARED |
669 MNTK_EXTENDED_SHARED;
670 MNT_IUNLOCK(mp);
671 return (0);
672 out:
673 if (bp)
674 brelse(bp);
675 if (cp != NULL) {
676 DROP_GIANT();
677 g_topology_lock();
678 g_vfs_close(cp);
679 g_topology_unlock();
680 PICKUP_GIANT();
681 }
682 if (ump) {
683 mtx_destroy(EXT2_MTX(ump));
684 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT);
685 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT);
686 free(ump->um_e2fs->e2fs, M_EXT2MNT);
687 free(ump->um_e2fs, M_EXT2MNT);
688 free(ump, M_EXT2MNT);
689 mp->mnt_data = NULL;
690 }
691 return (error);
692 }
693
694 /*
695 * Unmount system call.
696 */
697 static int
698 ext2_unmount(struct mount *mp, int mntflags)
699 {
700 struct ext2mount *ump;
701 struct m_ext2fs *fs;
702 struct csum *sump;
703 int error, flags, i, ronly;
704
705 flags = 0;
706 if (mntflags & MNT_FORCE) {
707 if (mp->mnt_flag & MNT_ROOTFS)
708 return (EINVAL);
709 flags |= FORCECLOSE;
710 }
711 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0)
712 return (error);
713 ump = VFSTOEXT2(mp);
714 fs = ump->um_e2fs;
715 ronly = fs->e2fs_ronly;
716 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) {
717 if (fs->e2fs_wasvalid)
718 fs->e2fs->e2fs_state |= E2FS_ISCLEAN;
719 ext2_sbupdate(ump, MNT_WAIT);
720 }
721
722 DROP_GIANT();
723 g_topology_lock();
724 g_vfs_close(ump->um_cp);
725 g_topology_unlock();
726 PICKUP_GIANT();
727 vrele(ump->um_devvp);
728 sump = fs->e2fs_clustersum;
729 for (i = 0; i < fs->e2fs_gcount; i++, sump++)
730 free(sump->cs_sum, M_EXT2MNT);
731 free(fs->e2fs_clustersum, M_EXT2MNT);
732 free(fs->e2fs_maxcluster, M_EXT2MNT);
733 free(fs->e2fs_gd, M_EXT2MNT);
734 free(fs->e2fs_contigdirs, M_EXT2MNT);
735 free(fs->e2fs, M_EXT2MNT);
736 free(fs, M_EXT2MNT);
737 free(ump, M_EXT2MNT);
738 mp->mnt_data = NULL;
739 MNT_ILOCK(mp);
740 mp->mnt_flag &= ~MNT_LOCAL;
741 MNT_IUNLOCK(mp);
742 return (error);
743 }
744
745 /*
746 * Flush out all the files in a filesystem.
747 */
748 static int
749 ext2_flushfiles(struct mount *mp, int flags, struct thread *td)
750 {
751 int error;
752
753 error = vflush(mp, 0, flags, td);
754 return (error);
755 }
756 /*
757 * Get file system statistics.
758 */
759 int
760 ext2_statfs(struct mount *mp, struct statfs *sbp)
761 {
762 struct ext2mount *ump;
763 struct m_ext2fs *fs;
764 uint32_t overhead, overhead_per_group, ngdb;
765 int i, ngroups;
766
767 ump = VFSTOEXT2(mp);
768 fs = ump->um_e2fs;
769 if (fs->e2fs->e2fs_magic != E2FS_MAGIC)
770 panic("ext2fs_statvfs");
771
772 /*
773 * Compute the overhead (FS structures)
774 */
775 overhead_per_group =
776 1 /* block bitmap */ +
777 1 /* inode bitmap */ +
778 fs->e2fs_itpg;
779 overhead = fs->e2fs->e2fs_first_dblock +
780 fs->e2fs_gcount * overhead_per_group;
781 if (fs->e2fs->e2fs_rev > E2FS_REV0 &&
782 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) {
783 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) {
784 if (cg_has_sb(i))
785 ngroups++;
786 }
787 } else {
788 ngroups = fs->e2fs_gcount;
789 }
790 ngdb = fs->e2fs_gdbcount;
791 if (fs->e2fs->e2fs_rev > E2FS_REV0 &&
792 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE)
793 ngdb += fs->e2fs->e2fs_reserved_ngdb;
794 overhead += ngroups * (1 /* superblock */ + ngdb);
795
796 sbp->f_bsize = EXT2_FRAG_SIZE(fs);
797 sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
798 sbp->f_blocks = fs->e2fs->e2fs_bcount - overhead;
799 sbp->f_bfree = fs->e2fs->e2fs_fbcount;
800 sbp->f_bavail = sbp->f_bfree - fs->e2fs->e2fs_rbcount;
801 sbp->f_files = fs->e2fs->e2fs_icount;
802 sbp->f_ffree = fs->e2fs->e2fs_ficount;
803 return (0);
804 }
805
806 /*
807 * Go through the disk queues to initiate sandbagged IO;
808 * go through the inodes to write those that have been modified;
809 * initiate the writing of the super block if it has been modified.
810 *
811 * Note: we are always called with the filesystem marked `MPBUSY'.
812 */
813 static int
814 ext2_sync(struct mount *mp, int waitfor)
815 {
816 struct vnode *mvp, *vp;
817 struct thread *td;
818 struct inode *ip;
819 struct ext2mount *ump = VFSTOEXT2(mp);
820 struct m_ext2fs *fs;
821 int error, allerror = 0;
822
823 td = curthread;
824 fs = ump->um_e2fs;
825 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */
826 printf("fs = %s\n", fs->e2fs_fsmnt);
827 panic("ext2_sync: rofs mod");
828 }
829
830 /*
831 * Write back each (modified) inode.
832 */
833 loop:
834 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
835 if (vp->v_type == VNON) {
836 VI_UNLOCK(vp);
837 continue;
838 }
839 ip = VTOI(vp);
840 if ((ip->i_flag &
841 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
842 (vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
843 waitfor == MNT_LAZY)) {
844 VI_UNLOCK(vp);
845 continue;
846 }
847 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td);
848 if (error) {
849 if (error == ENOENT) {
850 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
851 goto loop;
852 }
853 continue;
854 }
855 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0)
856 allerror = error;
857 VOP_UNLOCK(vp, 0);
858 vrele(vp);
859 }
860
861 /*
862 * Force stale file system control information to be flushed.
863 */
864 if (waitfor != MNT_LAZY) {
865 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
866 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
867 allerror = error;
868 VOP_UNLOCK(ump->um_devvp, 0);
869 }
870
871 /*
872 * Write back modified superblock.
873 */
874 if (fs->e2fs_fmod != 0) {
875 fs->e2fs_fmod = 0;
876 fs->e2fs->e2fs_wtime = time_second;
877 if ((error = ext2_cgupdate(ump, waitfor)) != 0)
878 allerror = error;
879 }
880 return (allerror);
881 }
882
883 /*
884 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it
885 * in from disk. If it is in core, wait for the lock bit to clear, then
886 * return the inode locked. Detection and handling of mount points must be
887 * done by the calling routine.
888 */
889 static int
890 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
891 {
892 struct m_ext2fs *fs;
893 struct inode *ip;
894 struct ext2mount *ump;
895 struct buf *bp;
896 struct vnode *vp;
897 struct cdev *dev;
898 struct thread *td;
899 int i, error;
900 int used_blocks;
901
902 td = curthread;
903 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL);
904 if (error || *vpp != NULL)
905 return (error);
906
907 ump = VFSTOEXT2(mp);
908 dev = ump->um_dev;
909
910 /*
911 * If this malloc() is performed after the getnewvnode()
912 * it might block, leaving a vnode with a NULL v_data to be
913 * found by ext2_sync() if a sync happens to fire right then,
914 * which will cause a panic because ext2_sync() blindly
915 * dereferences vp->v_data (as well it should).
916 */
917 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO);
918
919 /* Allocate a new vnode/inode. */
920 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) {
921 *vpp = NULL;
922 free(ip, M_EXT2NODE);
923 return (error);
924 }
925 vp->v_data = ip;
926 ip->i_vnode = vp;
927 ip->i_e2fs = fs = ump->um_e2fs;
928 ip->i_ump = ump;
929 ip->i_number = ino;
930
931 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
932 error = insmntque(vp, mp);
933 if (error != 0) {
934 free(ip, M_EXT2NODE);
935 *vpp = NULL;
936 return (error);
937 }
938 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
939 if (error || *vpp != NULL)
940 return (error);
941
942 /* Read in the disk contents for the inode, copy into the inode. */
943 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
944 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
945 /*
946 * The inode does not contain anything useful, so it would
947 * be misleading to leave it on its hash chain. With mode
948 * still zero, it will be unlinked and returned to the free
949 * list by vput().
950 */
951 brelse(bp);
952 vput(vp);
953 *vpp = NULL;
954 return (error);
955 }
956 /* convert ext2 inode to dinode */
957 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) *
958 ino_to_fsbo(fs, ino)), ip);
959 ip->i_block_group = ino_to_cg(fs, ino);
960 ip->i_next_alloc_block = 0;
961 ip->i_next_alloc_goal = 0;
962
963 /*
964 * Now we want to make sure that block pointers for unused
965 * blocks are zeroed out - ext2_balloc depends on this
966 * although for regular files and directories only
967 */
968 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
969 used_blocks = (ip->i_size+fs->e2fs_bsize-1) / fs->e2fs_bsize;
970 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
971 ip->i_db[i] = 0;
972 }
973 /*
974 ext2_print_inode(ip);
975 */
976 bqrelse(bp);
977
978 /*
979 * Initialize the vnode from the inode, check for aliases.
980 * Note that the underlying vnode may have changed.
981 */
982 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) {
983 vput(vp);
984 *vpp = NULL;
985 return (error);
986 }
987
988 /*
989 * Finish inode initialization.
990 */
991
992 /*
993 * Set up a generation number for this inode if it does not
994 * already have one. This should only happen on old filesystems.
995 */
996 if (ip->i_gen == 0) {
997 ip->i_gen = random() / 2 + 1;
998 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
999 ip->i_flag |= IN_MODIFIED;
1000 }
1001 *vpp = vp;
1002 return (0);
1003 }
1004
1005 /*
1006 * File handle to vnode
1007 *
1008 * Have to be really careful about stale file handles:
1009 * - check that the inode number is valid
1010 * - call ext2_vget() to get the locked inode
1011 * - check for an unallocated inode (i_mode == 0)
1012 * - check that the given client host has export rights and return
1013 * those rights via. exflagsp and credanonp
1014 */
1015 static int
1016 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
1017 {
1018 struct inode *ip;
1019 struct ufid *ufhp;
1020 struct vnode *nvp;
1021 struct m_ext2fs *fs;
1022 int error;
1023
1024 ufhp = (struct ufid *)fhp;
1025 fs = VFSTOEXT2(mp)->um_e2fs;
1026 if (ufhp->ufid_ino < EXT2_ROOTINO ||
1027 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg)
1028 return (ESTALE);
1029
1030 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
1031 if (error) {
1032 *vpp = NULLVP;
1033 return (error);
1034 }
1035 ip = VTOI(nvp);
1036 if (ip->i_mode == 0 ||
1037 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) {
1038 vput(nvp);
1039 *vpp = NULLVP;
1040 return (ESTALE);
1041 }
1042 *vpp = nvp;
1043 vnode_create_vobject(*vpp, 0, curthread);
1044 return (0);
1045 }
1046
1047 /*
1048 * Write a superblock and associated information back to disk.
1049 */
1050 static int
1051 ext2_sbupdate(struct ext2mount *mp, int waitfor)
1052 {
1053 struct m_ext2fs *fs = mp->um_e2fs;
1054 struct ext2fs *es = fs->e2fs;
1055 struct buf *bp;
1056 int error = 0;
1057
1058 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0);
1059 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs));
1060 if (waitfor == MNT_WAIT)
1061 error = bwrite(bp);
1062 else
1063 bawrite(bp);
1064
1065 /*
1066 * The buffers for group descriptors, inode bitmaps and block bitmaps
1067 * are not busy at this point and are (hopefully) written by the
1068 * usual sync mechanism. No need to write them here.
1069 */
1070 return (error);
1071 }
1072 int
1073 ext2_cgupdate(struct ext2mount *mp, int waitfor)
1074 {
1075 struct m_ext2fs *fs = mp->um_e2fs;
1076 struct buf *bp;
1077 int i, error = 0, allerror = 0;
1078
1079 allerror = ext2_sbupdate(mp, waitfor);
1080 for (i = 0; i < fs->e2fs_gdbcount; i++) {
1081 bp = getblk(mp->um_devvp, fsbtodb(fs,
1082 fs->e2fs->e2fs_first_dblock +
1083 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0);
1084 e2fs_cgsave(&fs->e2fs_gd[
1085 i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
1086 (struct ext2_gd *)bp->b_data, fs->e2fs_bsize);
1087 if (waitfor == MNT_WAIT)
1088 error = bwrite(bp);
1089 else
1090 bawrite(bp);
1091 }
1092
1093 if (!allerror && error)
1094 allerror = error;
1095 return (allerror);
1096 }
1097 /*
1098 * Return the root of a filesystem.
1099 */
1100 static int
1101 ext2_root(struct mount *mp, int flags, struct vnode **vpp)
1102 {
1103 struct vnode *nvp;
1104 int error;
1105
1106 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp);
1107 if (error)
1108 return (error);
1109 *vpp = nvp;
1110 return (0);
1111 }
Cache object: 18503cb4e390c7292a2601f6c483f17d
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