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
67static int ext2_flushfiles(struct mount *mp, int flags, struct thread *td);
68static int ext2_mountfs(struct vnode *, struct mount *);
69static int ext2_reload(struct mount *mp, struct thread *td);
70static int ext2_sbupdate(struct ext2mount *, int);
71static int ext2_cgupdate(struct ext2mount *, int);
72static vfs_unmount_t ext2_unmount;
73static vfs_root_t ext2_root;
74static vfs_statfs_t ext2_statfs;
75static vfs_sync_t ext2_sync;
76static vfs_vget_t ext2_vget;
77static vfs_fhtovp_t ext2_fhtovp;
78static vfs_mount_t ext2_mount;
79
80MALLOC_DEFINE(M_EXT2NODE, "ext2_node", "EXT2 vnode private part");
81static MALLOC_DEFINE(M_EXT2MNT, "ext2_mount", "EXT2 mount structure");
82
83static 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
93VFS_SET(ext2fs_vfsops, ext2fs, 0);
94
95static int ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev,
96 int ronly);
97static int compute_sb_data(struct vnode * devvp,
98 struct ext2fs * es, struct m_ext2fs * fs);
99
100static 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 */
109static int
110ext2_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
283static int
284ext2_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 */
313static int
314compute_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 uint32_t e2fs_descpb;
322
323 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize;
324 fs->e2fs_bsize = 1U << fs->e2fs_bshift;
325 fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1;
326 fs->e2fs_qbmask = fs->e2fs_bsize - 1;
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_isize = E2FS_REV0_INODE_SIZE ;
335 } else {
336 fs->e2fs_isize = es->e2fs_inode_size;
337
338 /*
339 * Simple sanity check for superblock inode size value.
340 */
341 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE ||
342 EXT2_INODE_SIZE(fs) > fs->e2fs_bsize ||
343 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) {
344 printf("ext2fs: invalid inode size %d\n",
345 fs->e2fs_isize);
346 return (EIO);
347 }
348 }
349 /* Check for extra isize in big inodes. */
350 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) &&
351 EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) {
352 printf("ext2fs: no space for extra inode timestamps\n");
353 return (EINVAL);
354 }
355
356 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs);
357 fs->e2fs_itpg = fs->e2fs_ipg /fs->e2fs_ipb;
358 /* s_resuid / s_resgid ? */
359 fs->e2fs_gcount = (es->e2fs_bcount - es->e2fs_first_dblock +
360 EXT2_BLOCKS_PER_GROUP(fs) - 1) / EXT2_BLOCKS_PER_GROUP(fs);
361 e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd);
362 db_count = (fs->e2fs_gcount + e2fs_descpb - 1) / e2fs_descpb;
363 fs->e2fs_gdbcount = db_count;
364 fs->e2fs_gd = malloc(db_count * fs->e2fs_bsize,
365 M_EXT2MNT, M_WAITOK);
366 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount *
367 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK);
368
369 /*
370 * Adjust logic_sb_block.
371 * Godmar thinks: if the blocksize is greater than 1024, then
372 * the superblock is logically part of block zero.
373 */
374 if(fs->e2fs_bsize > SBSIZE)
375 logic_sb_block = 0;
376 for (i = 0; i < db_count; i++) {
377 error = bread(devvp ,
378 fsbtodb(fs, logic_sb_block + i + 1 ),
379 fs->e2fs_bsize, NOCRED, &bp);
380 if (error) {
381 free(fs->e2fs_gd, M_EXT2MNT);
382 brelse(bp);
383 return (error);
384 }
385 e2fs_cgload((struct ext2_gd *)bp->b_data,
386 &fs->e2fs_gd[
387 i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
388 fs->e2fs_bsize);
389 brelse(bp);
390 bp = NULL;
391 }
392 fs->e2fs_total_dir = 0;
393 for (i=0; i < fs->e2fs_gcount; i++){
394 fs->e2fs_total_dir += fs->e2fs_gd[i].ext2bgd_ndirs;
395 fs->e2fs_contigdirs[i] = 0;
396 }
397 if (es->e2fs_rev == E2FS_REV0 ||
398 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE))
399 fs->e2fs_maxfilesize = 0x7fffffff;
400 else
401 fs->e2fs_maxfilesize = 0x7fffffffffffffff;
402 return (0);
403}
404
405/*
406 * Reload all incore data for a filesystem (used after running fsck on
407 * the root filesystem and finding things to fix). The filesystem must
408 * be mounted read-only.
409 *
410 * Things to do to update the mount:
411 * 1) invalidate all cached meta-data.
412 * 2) re-read superblock from disk.
413 * 3) invalidate all cluster summary information.
414 * 4) invalidate all inactive vnodes.
415 * 5) invalidate all cached file data.
416 * 6) re-read inode data for all active vnodes.
417 * XXX we are missing some steps, in particular # 3, this has to be reviewed.
418 */
419static int
420ext2_reload(struct mount *mp, struct thread *td)
421{
422 struct vnode *vp, *mvp, *devvp;
423 struct inode *ip;
424 struct buf *bp;
425 struct ext2fs *es;
426 struct m_ext2fs *fs;
427 struct csum *sump;
428 int error, i;
429 int32_t *lp;
430
431 if ((mp->mnt_flag & MNT_RDONLY) == 0)
432 return (EINVAL);
433 /*
434 * Step 1: invalidate all cached meta-data.
435 */
436 devvp = VFSTOEXT2(mp)->um_devvp;
437 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
438 if (vinvalbuf(devvp, 0, 0, 0) != 0)
439 panic("ext2_reload: dirty1");
440 VOP_UNLOCK(devvp, 0);
441
442 /*
443 * Step 2: re-read superblock from disk.
444 * constants have been adjusted for ext2
445 */
446 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
447 return (error);
448 es = (struct ext2fs *)bp->b_data;
449 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
450 brelse(bp);
451 return (EIO); /* XXX needs translation */
452 }
453 fs = VFSTOEXT2(mp)->um_e2fs;
454 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs));
455
456 if((error = compute_sb_data(devvp, es, fs)) != 0) {
457 brelse(bp);
458 return (error);
459 }
460#ifdef UNKLAR
461 if (fs->fs_sbsize < SBSIZE)
462 bp->b_flags |= B_INVAL;
463#endif
464 brelse(bp);
465
466 /*
467 * Step 3: invalidate all cluster summary information.
468 */
469 if (fs->e2fs_contigsumsize > 0) {
470 lp = fs->e2fs_maxcluster;
471 sump = fs->e2fs_clustersum;
472 for (i = 0; i < fs->e2fs_gcount; i++, sump++) {
473 *lp++ = fs->e2fs_contigsumsize;
474 sump->cs_init = 0;
475 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1);
476 }
477 }
478
479loop:
480 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
481 /*
482 * Step 4: invalidate all cached file data.
483 */
484 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
485 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
486 goto loop;
487 }
488 if (vinvalbuf(vp, 0, 0, 0))
489 panic("ext2_reload: dirty2");
490
491 /*
492 * Step 5: re-read inode data for all active vnodes.
493 */
494 ip = VTOI(vp);
495 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
496 (int)fs->e2fs_bsize, NOCRED, &bp);
497 if (error) {
498 VOP_UNLOCK(vp, 0);
499 vrele(vp);
500 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
501 return (error);
502 }
503 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data +
504 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip);
505 brelse(bp);
506 VOP_UNLOCK(vp, 0);
507 vrele(vp);
508 }
509 return (0);
510}
511
512/*
513 * Common code for mount and mountroot.
514 */
515static int
516ext2_mountfs(struct vnode *devvp, struct mount *mp)
517{
518 struct ext2mount *ump;
519 struct buf *bp;
520 struct m_ext2fs *fs;
521 struct ext2fs *es;
522 struct cdev *dev = devvp->v_rdev;
523 struct g_consumer *cp;
524 struct bufobj *bo;
525 struct csum *sump;
526 int error;
527 int ronly;
528 int i, size;
529 int32_t *lp;
530 int32_t e2fs_maxcontig;
531
532 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0);
533 /* XXX: use VOP_ACESS to check FS perms */
534 DROP_GIANT();
535 g_topology_lock();
536 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1);
537 g_topology_unlock();
538 PICKUP_GIANT();
539 VOP_UNLOCK(devvp, 0);
540 if (error)
541 return (error);
542
543 /* XXX: should we check for some sectorsize or 512 instead? */
544 if (((SBSIZE % cp->provider->sectorsize) != 0) ||
545 (SBSIZE < cp->provider->sectorsize)) {
546 DROP_GIANT();
547 g_topology_lock();
548 g_vfs_close(cp);
549 g_topology_unlock();
550 PICKUP_GIANT();
551 return (EINVAL);
552 }
553
554 bo = &devvp->v_bufobj;
555 bo->bo_private = cp;
556 bo->bo_ops = g_vfs_bufops;
557 if (devvp->v_rdev->si_iosize_max != 0)
558 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
559 if (mp->mnt_iosize_max > MAXPHYS)
560 mp->mnt_iosize_max = MAXPHYS;
561
562 bp = NULL;
563 ump = NULL;
564 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
565 goto out;
566 es = (struct ext2fs *)bp->b_data;
567 if (ext2_check_sb_compat(es, dev, ronly) != 0) {
568 error = EINVAL; /* XXX needs translation */
569 goto out;
570 }
571 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 ||
572 (es->e2fs_state & E2FS_ERRORS)) {
573 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
574 printf(
575"WARNING: Filesystem was not properly dismounted\n");
576 } else {
577 printf(
578"WARNING: R/W mount denied. Filesystem is not clean - run fsck\n");
579 error = EPERM;
580 goto out;
581 }
582 }
583 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO);
584
585 /*
586 * I don't know whether this is the right strategy. Note that
587 * we dynamically allocate both an ext2_sb_info and an ext2_super_block
588 * while Linux keeps the super block in a locked buffer.
589 */
590 ump->um_e2fs = malloc(sizeof(struct m_ext2fs),
591 M_EXT2MNT, M_WAITOK);
592 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs),
593 M_EXT2MNT, M_WAITOK);
594 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF);
595 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs));
596 if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs)))
597 goto out;
598
599 /*
600 * Calculate the maximum contiguous blocks and size of cluster summary
601 * array. In FFS this is done by newfs; however, the superblock
602 * in ext2fs doesn't have these variables, so we can calculate
603 * them here.
604 */
605 e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize);
606 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG);
607 if (ump->um_e2fs->e2fs_contigsumsize > 0) {
608 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t);
609 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK);
610 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum);
611 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK);
612 lp = ump->um_e2fs->e2fs_maxcluster;
613 sump = ump->um_e2fs->e2fs_clustersum;
614 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) {
615 *lp++ = ump->um_e2fs->e2fs_contigsumsize;
616 sump->cs_init = 0;
617 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) *
618 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO);
619 }
620 }
621
622 brelse(bp);
623 bp = NULL;
624 fs = ump->um_e2fs;
625 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */
626
627 /*
628 * If the fs is not mounted read-only, make sure the super block is
629 * always written back on a sync().
630 */
631 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0;
632 if (ronly == 0) {
633 fs->e2fs_fmod = 1; /* mark it modified */
634 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */
635 }
636 mp->mnt_data = ump;
637 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
638 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
639 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
640 MNT_ILOCK(mp);
641 mp->mnt_flag |= MNT_LOCAL;
642 MNT_IUNLOCK(mp);
643 ump->um_mountp = mp;
644 ump->um_dev = dev;
645 ump->um_devvp = devvp;
646 ump->um_bo = &devvp->v_bufobj;
647 ump->um_cp = cp;
648
649 /*
650 * Setting those two parameters allowed us to use
651 * ufs_bmap w/o changse!
652 */
653 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
654 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1;
655 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
656 if (ronly == 0)
657 ext2_sbupdate(ump, MNT_WAIT);
658 /*
659 * Initialize filesystem stat information in mount struct.
660 */
661 MNT_ILOCK(mp);
662 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED;
663 MNT_IUNLOCK(mp);
664 return (0);
665out:
666 if (bp)
667 brelse(bp);
668 if (cp != NULL) {
669 DROP_GIANT();
670 g_topology_lock();
671 g_vfs_close(cp);
672 g_topology_unlock();
673 PICKUP_GIANT();
674 }
675 if (ump) {
676 mtx_destroy(EXT2_MTX(ump));
677 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT);
678 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT);
679 free(ump->um_e2fs->e2fs, M_EXT2MNT);
680 free(ump->um_e2fs, M_EXT2MNT);
681 free(ump, M_EXT2MNT);
682 mp->mnt_data = NULL;
683 }
684 return (error);
685}
686
687/*
688 * Unmount system call.
689 */
690static int
691ext2_unmount(struct mount *mp, int mntflags)
692{
693 struct ext2mount *ump;
694 struct m_ext2fs *fs;
695 struct csum *sump;
696 int error, flags, i, ronly;
697
698 flags = 0;
699 if (mntflags & MNT_FORCE) {
700 if (mp->mnt_flag & MNT_ROOTFS)
701 return (EINVAL);
702 flags |= FORCECLOSE;
703 }
704 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0)
705 return (error);
706 ump = VFSTOEXT2(mp);
707 fs = ump->um_e2fs;
708 ronly = fs->e2fs_ronly;
709 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) {
710 if (fs->e2fs_wasvalid)
711 fs->e2fs->e2fs_state |= E2FS_ISCLEAN;
712 ext2_sbupdate(ump, MNT_WAIT);
713 }
714
715 DROP_GIANT();
716 g_topology_lock();
717 g_vfs_close(ump->um_cp);
718 g_topology_unlock();
719 PICKUP_GIANT();
720 vrele(ump->um_devvp);
721 sump = fs->e2fs_clustersum;
722 for (i = 0; i < fs->e2fs_gcount; i++, sump++)
723 free(sump->cs_sum, M_EXT2MNT);
724 free(fs->e2fs_clustersum, M_EXT2MNT);
725 free(fs->e2fs_maxcluster, M_EXT2MNT);
726 free(fs->e2fs_gd, M_EXT2MNT);
727 free(fs->e2fs_contigdirs, M_EXT2MNT);
728 free(fs->e2fs, M_EXT2MNT);
729 free(fs, M_EXT2MNT);
730 free(ump, M_EXT2MNT);
731 mp->mnt_data = NULL;
732 MNT_ILOCK(mp);
733 mp->mnt_flag &= ~MNT_LOCAL;
734 MNT_IUNLOCK(mp);
735 return (error);
736}
737
738/*
739 * Flush out all the files in a filesystem.
740 */
741static int
742ext2_flushfiles(struct mount *mp, int flags, struct thread *td)
743{
744 int error;
745
746 error = vflush(mp, 0, flags, td);
747 return (error);
748}
749/*
| 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
67static int ext2_flushfiles(struct mount *mp, int flags, struct thread *td);
68static int ext2_mountfs(struct vnode *, struct mount *);
69static int ext2_reload(struct mount *mp, struct thread *td);
70static int ext2_sbupdate(struct ext2mount *, int);
71static int ext2_cgupdate(struct ext2mount *, int);
72static vfs_unmount_t ext2_unmount;
73static vfs_root_t ext2_root;
74static vfs_statfs_t ext2_statfs;
75static vfs_sync_t ext2_sync;
76static vfs_vget_t ext2_vget;
77static vfs_fhtovp_t ext2_fhtovp;
78static vfs_mount_t ext2_mount;
79
80MALLOC_DEFINE(M_EXT2NODE, "ext2_node", "EXT2 vnode private part");
81static MALLOC_DEFINE(M_EXT2MNT, "ext2_mount", "EXT2 mount structure");
82
83static 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
93VFS_SET(ext2fs_vfsops, ext2fs, 0);
94
95static int ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev,
96 int ronly);
97static int compute_sb_data(struct vnode * devvp,
98 struct ext2fs * es, struct m_ext2fs * fs);
99
100static 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 */
109static int
110ext2_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
283static int
284ext2_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 */
313static int
314compute_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 uint32_t e2fs_descpb;
322
323 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize;
324 fs->e2fs_bsize = 1U << fs->e2fs_bshift;
325 fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1;
326 fs->e2fs_qbmask = fs->e2fs_bsize - 1;
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_isize = E2FS_REV0_INODE_SIZE ;
335 } else {
336 fs->e2fs_isize = es->e2fs_inode_size;
337
338 /*
339 * Simple sanity check for superblock inode size value.
340 */
341 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE ||
342 EXT2_INODE_SIZE(fs) > fs->e2fs_bsize ||
343 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) {
344 printf("ext2fs: invalid inode size %d\n",
345 fs->e2fs_isize);
346 return (EIO);
347 }
348 }
349 /* Check for extra isize in big inodes. */
350 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) &&
351 EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) {
352 printf("ext2fs: no space for extra inode timestamps\n");
353 return (EINVAL);
354 }
355
356 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs);
357 fs->e2fs_itpg = fs->e2fs_ipg /fs->e2fs_ipb;
358 /* s_resuid / s_resgid ? */
359 fs->e2fs_gcount = (es->e2fs_bcount - es->e2fs_first_dblock +
360 EXT2_BLOCKS_PER_GROUP(fs) - 1) / EXT2_BLOCKS_PER_GROUP(fs);
361 e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd);
362 db_count = (fs->e2fs_gcount + e2fs_descpb - 1) / e2fs_descpb;
363 fs->e2fs_gdbcount = db_count;
364 fs->e2fs_gd = malloc(db_count * fs->e2fs_bsize,
365 M_EXT2MNT, M_WAITOK);
366 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount *
367 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK);
368
369 /*
370 * Adjust logic_sb_block.
371 * Godmar thinks: if the blocksize is greater than 1024, then
372 * the superblock is logically part of block zero.
373 */
374 if(fs->e2fs_bsize > SBSIZE)
375 logic_sb_block = 0;
376 for (i = 0; i < db_count; i++) {
377 error = bread(devvp ,
378 fsbtodb(fs, logic_sb_block + i + 1 ),
379 fs->e2fs_bsize, NOCRED, &bp);
380 if (error) {
381 free(fs->e2fs_gd, M_EXT2MNT);
382 brelse(bp);
383 return (error);
384 }
385 e2fs_cgload((struct ext2_gd *)bp->b_data,
386 &fs->e2fs_gd[
387 i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
388 fs->e2fs_bsize);
389 brelse(bp);
390 bp = NULL;
391 }
392 fs->e2fs_total_dir = 0;
393 for (i=0; i < fs->e2fs_gcount; i++){
394 fs->e2fs_total_dir += fs->e2fs_gd[i].ext2bgd_ndirs;
395 fs->e2fs_contigdirs[i] = 0;
396 }
397 if (es->e2fs_rev == E2FS_REV0 ||
398 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE))
399 fs->e2fs_maxfilesize = 0x7fffffff;
400 else
401 fs->e2fs_maxfilesize = 0x7fffffffffffffff;
402 return (0);
403}
404
405/*
406 * Reload all incore data for a filesystem (used after running fsck on
407 * the root filesystem and finding things to fix). The filesystem must
408 * be mounted read-only.
409 *
410 * Things to do to update the mount:
411 * 1) invalidate all cached meta-data.
412 * 2) re-read superblock from disk.
413 * 3) invalidate all cluster summary information.
414 * 4) invalidate all inactive vnodes.
415 * 5) invalidate all cached file data.
416 * 6) re-read inode data for all active vnodes.
417 * XXX we are missing some steps, in particular # 3, this has to be reviewed.
418 */
419static int
420ext2_reload(struct mount *mp, struct thread *td)
421{
422 struct vnode *vp, *mvp, *devvp;
423 struct inode *ip;
424 struct buf *bp;
425 struct ext2fs *es;
426 struct m_ext2fs *fs;
427 struct csum *sump;
428 int error, i;
429 int32_t *lp;
430
431 if ((mp->mnt_flag & MNT_RDONLY) == 0)
432 return (EINVAL);
433 /*
434 * Step 1: invalidate all cached meta-data.
435 */
436 devvp = VFSTOEXT2(mp)->um_devvp;
437 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
438 if (vinvalbuf(devvp, 0, 0, 0) != 0)
439 panic("ext2_reload: dirty1");
440 VOP_UNLOCK(devvp, 0);
441
442 /*
443 * Step 2: re-read superblock from disk.
444 * constants have been adjusted for ext2
445 */
446 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
447 return (error);
448 es = (struct ext2fs *)bp->b_data;
449 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
450 brelse(bp);
451 return (EIO); /* XXX needs translation */
452 }
453 fs = VFSTOEXT2(mp)->um_e2fs;
454 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs));
455
456 if((error = compute_sb_data(devvp, es, fs)) != 0) {
457 brelse(bp);
458 return (error);
459 }
460#ifdef UNKLAR
461 if (fs->fs_sbsize < SBSIZE)
462 bp->b_flags |= B_INVAL;
463#endif
464 brelse(bp);
465
466 /*
467 * Step 3: invalidate all cluster summary information.
468 */
469 if (fs->e2fs_contigsumsize > 0) {
470 lp = fs->e2fs_maxcluster;
471 sump = fs->e2fs_clustersum;
472 for (i = 0; i < fs->e2fs_gcount; i++, sump++) {
473 *lp++ = fs->e2fs_contigsumsize;
474 sump->cs_init = 0;
475 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1);
476 }
477 }
478
479loop:
480 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
481 /*
482 * Step 4: invalidate all cached file data.
483 */
484 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
485 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
486 goto loop;
487 }
488 if (vinvalbuf(vp, 0, 0, 0))
489 panic("ext2_reload: dirty2");
490
491 /*
492 * Step 5: re-read inode data for all active vnodes.
493 */
494 ip = VTOI(vp);
495 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
496 (int)fs->e2fs_bsize, NOCRED, &bp);
497 if (error) {
498 VOP_UNLOCK(vp, 0);
499 vrele(vp);
500 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
501 return (error);
502 }
503 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data +
504 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip);
505 brelse(bp);
506 VOP_UNLOCK(vp, 0);
507 vrele(vp);
508 }
509 return (0);
510}
511
512/*
513 * Common code for mount and mountroot.
514 */
515static int
516ext2_mountfs(struct vnode *devvp, struct mount *mp)
517{
518 struct ext2mount *ump;
519 struct buf *bp;
520 struct m_ext2fs *fs;
521 struct ext2fs *es;
522 struct cdev *dev = devvp->v_rdev;
523 struct g_consumer *cp;
524 struct bufobj *bo;
525 struct csum *sump;
526 int error;
527 int ronly;
528 int i, size;
529 int32_t *lp;
530 int32_t e2fs_maxcontig;
531
532 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0);
533 /* XXX: use VOP_ACESS to check FS perms */
534 DROP_GIANT();
535 g_topology_lock();
536 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1);
537 g_topology_unlock();
538 PICKUP_GIANT();
539 VOP_UNLOCK(devvp, 0);
540 if (error)
541 return (error);
542
543 /* XXX: should we check for some sectorsize or 512 instead? */
544 if (((SBSIZE % cp->provider->sectorsize) != 0) ||
545 (SBSIZE < cp->provider->sectorsize)) {
546 DROP_GIANT();
547 g_topology_lock();
548 g_vfs_close(cp);
549 g_topology_unlock();
550 PICKUP_GIANT();
551 return (EINVAL);
552 }
553
554 bo = &devvp->v_bufobj;
555 bo->bo_private = cp;
556 bo->bo_ops = g_vfs_bufops;
557 if (devvp->v_rdev->si_iosize_max != 0)
558 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
559 if (mp->mnt_iosize_max > MAXPHYS)
560 mp->mnt_iosize_max = MAXPHYS;
561
562 bp = NULL;
563 ump = NULL;
564 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
565 goto out;
566 es = (struct ext2fs *)bp->b_data;
567 if (ext2_check_sb_compat(es, dev, ronly) != 0) {
568 error = EINVAL; /* XXX needs translation */
569 goto out;
570 }
571 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 ||
572 (es->e2fs_state & E2FS_ERRORS)) {
573 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
574 printf(
575"WARNING: Filesystem was not properly dismounted\n");
576 } else {
577 printf(
578"WARNING: R/W mount denied. Filesystem is not clean - run fsck\n");
579 error = EPERM;
580 goto out;
581 }
582 }
583 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO);
584
585 /*
586 * I don't know whether this is the right strategy. Note that
587 * we dynamically allocate both an ext2_sb_info and an ext2_super_block
588 * while Linux keeps the super block in a locked buffer.
589 */
590 ump->um_e2fs = malloc(sizeof(struct m_ext2fs),
591 M_EXT2MNT, M_WAITOK);
592 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs),
593 M_EXT2MNT, M_WAITOK);
594 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF);
595 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs));
596 if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs)))
597 goto out;
598
599 /*
600 * Calculate the maximum contiguous blocks and size of cluster summary
601 * array. In FFS this is done by newfs; however, the superblock
602 * in ext2fs doesn't have these variables, so we can calculate
603 * them here.
604 */
605 e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize);
606 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG);
607 if (ump->um_e2fs->e2fs_contigsumsize > 0) {
608 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t);
609 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK);
610 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum);
611 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK);
612 lp = ump->um_e2fs->e2fs_maxcluster;
613 sump = ump->um_e2fs->e2fs_clustersum;
614 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) {
615 *lp++ = ump->um_e2fs->e2fs_contigsumsize;
616 sump->cs_init = 0;
617 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) *
618 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO);
619 }
620 }
621
622 brelse(bp);
623 bp = NULL;
624 fs = ump->um_e2fs;
625 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */
626
627 /*
628 * If the fs is not mounted read-only, make sure the super block is
629 * always written back on a sync().
630 */
631 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0;
632 if (ronly == 0) {
633 fs->e2fs_fmod = 1; /* mark it modified */
634 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */
635 }
636 mp->mnt_data = ump;
637 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
638 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
639 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
640 MNT_ILOCK(mp);
641 mp->mnt_flag |= MNT_LOCAL;
642 MNT_IUNLOCK(mp);
643 ump->um_mountp = mp;
644 ump->um_dev = dev;
645 ump->um_devvp = devvp;
646 ump->um_bo = &devvp->v_bufobj;
647 ump->um_cp = cp;
648
649 /*
650 * Setting those two parameters allowed us to use
651 * ufs_bmap w/o changse!
652 */
653 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
654 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1;
655 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
656 if (ronly == 0)
657 ext2_sbupdate(ump, MNT_WAIT);
658 /*
659 * Initialize filesystem stat information in mount struct.
660 */
661 MNT_ILOCK(mp);
662 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED;
663 MNT_IUNLOCK(mp);
664 return (0);
665out:
666 if (bp)
667 brelse(bp);
668 if (cp != NULL) {
669 DROP_GIANT();
670 g_topology_lock();
671 g_vfs_close(cp);
672 g_topology_unlock();
673 PICKUP_GIANT();
674 }
675 if (ump) {
676 mtx_destroy(EXT2_MTX(ump));
677 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT);
678 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT);
679 free(ump->um_e2fs->e2fs, M_EXT2MNT);
680 free(ump->um_e2fs, M_EXT2MNT);
681 free(ump, M_EXT2MNT);
682 mp->mnt_data = NULL;
683 }
684 return (error);
685}
686
687/*
688 * Unmount system call.
689 */
690static int
691ext2_unmount(struct mount *mp, int mntflags)
692{
693 struct ext2mount *ump;
694 struct m_ext2fs *fs;
695 struct csum *sump;
696 int error, flags, i, ronly;
697
698 flags = 0;
699 if (mntflags & MNT_FORCE) {
700 if (mp->mnt_flag & MNT_ROOTFS)
701 return (EINVAL);
702 flags |= FORCECLOSE;
703 }
704 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0)
705 return (error);
706 ump = VFSTOEXT2(mp);
707 fs = ump->um_e2fs;
708 ronly = fs->e2fs_ronly;
709 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) {
710 if (fs->e2fs_wasvalid)
711 fs->e2fs->e2fs_state |= E2FS_ISCLEAN;
712 ext2_sbupdate(ump, MNT_WAIT);
713 }
714
715 DROP_GIANT();
716 g_topology_lock();
717 g_vfs_close(ump->um_cp);
718 g_topology_unlock();
719 PICKUP_GIANT();
720 vrele(ump->um_devvp);
721 sump = fs->e2fs_clustersum;
722 for (i = 0; i < fs->e2fs_gcount; i++, sump++)
723 free(sump->cs_sum, M_EXT2MNT);
724 free(fs->e2fs_clustersum, M_EXT2MNT);
725 free(fs->e2fs_maxcluster, M_EXT2MNT);
726 free(fs->e2fs_gd, M_EXT2MNT);
727 free(fs->e2fs_contigdirs, M_EXT2MNT);
728 free(fs->e2fs, M_EXT2MNT);
729 free(fs, M_EXT2MNT);
730 free(ump, M_EXT2MNT);
731 mp->mnt_data = NULL;
732 MNT_ILOCK(mp);
733 mp->mnt_flag &= ~MNT_LOCAL;
734 MNT_IUNLOCK(mp);
735 return (error);
736}
737
738/*
739 * Flush out all the files in a filesystem.
740 */
741static int
742ext2_flushfiles(struct mount *mp, int flags, struct thread *td)
743{
744 int error;
745
746 error = vflush(mp, 0, flags, td);
747 return (error);
748}
749/*
|
856 */
857 if (waitfor != MNT_LAZY) {
858 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
859 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
860 allerror = error;
861 VOP_UNLOCK(ump->um_devvp, 0);
862 }
863
864 /*
865 * Write back modified superblock.
866 */
867 if (fs->e2fs_fmod != 0) {
868 fs->e2fs_fmod = 0;
869 fs->e2fs->e2fs_wtime = time_second;
870 if ((error = ext2_cgupdate(ump, waitfor)) != 0)
871 allerror = error;
872 }
873 return (allerror);
874}
875
876/*
877 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it
878 * in from disk. If it is in core, wait for the lock bit to clear, then
879 * return the inode locked. Detection and handling of mount points must be
880 * done by the calling routine.
881 */
882static int
883ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
884{
885 struct m_ext2fs *fs;
886 struct inode *ip;
887 struct ext2mount *ump;
888 struct buf *bp;
889 struct vnode *vp;
890 struct cdev *dev;
891 struct thread *td;
892 int i, error;
893 int used_blocks;
894
895 td = curthread;
896 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL);
897 if (error || *vpp != NULL)
898 return (error);
899
900 ump = VFSTOEXT2(mp);
901 dev = ump->um_dev;
902 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO);
903
904 /* Allocate a new vnode/inode. */
905 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) {
906 *vpp = NULL;
907 free(ip, M_EXT2NODE);
908 return (error);
909 }
910 vp->v_data = ip;
911 ip->i_vnode = vp;
912 ip->i_e2fs = fs = ump->um_e2fs;
913 ip->i_ump = ump;
914 ip->i_number = ino;
915
916 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
917 error = insmntque(vp, mp);
918 if (error != 0) {
919 free(ip, M_EXT2NODE);
920 *vpp = NULL;
921 return (error);
922 }
923 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
924 if (error || *vpp != NULL)
925 return (error);
926
927 /* Read in the disk contents for the inode, copy into the inode. */
928 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
929 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
930 /*
931 * The inode does not contain anything useful, so it would
932 * be misleading to leave it on its hash chain. With mode
933 * still zero, it will be unlinked and returned to the free
934 * list by vput().
935 */
936 brelse(bp);
937 vput(vp);
938 *vpp = NULL;
939 return (error);
940 }
941 /* convert ext2 inode to dinode */
942 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) *
943 ino_to_fsbo(fs, ino)), ip);
944 ip->i_block_group = ino_to_cg(fs, ino);
945 ip->i_next_alloc_block = 0;
946 ip->i_next_alloc_goal = 0;
947
948 /*
949 * Now we want to make sure that block pointers for unused
950 * blocks are zeroed out - ext2_balloc depends on this
951 * although for regular files and directories only
952 */
953 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
954 used_blocks = (ip->i_size+fs->e2fs_bsize-1) / fs->e2fs_bsize;
955 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
956 ip->i_db[i] = 0;
957 }
958/*
959 ext2_print_inode(ip);
960*/
961 bqrelse(bp);
962
963 /*
964 * Initialize the vnode from the inode, check for aliases.
965 * Note that the underlying vnode may have changed.
966 */
967 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) {
968 vput(vp);
969 *vpp = NULL;
970 return (error);
971 }
972
973 /*
974 * Finish inode initialization.
975 */
976
977 /*
978 * Set up a generation number for this inode if it does not
979 * already have one. This should only happen on old filesystems.
980 */
981 if (ip->i_gen == 0) {
982 ip->i_gen = random() / 2 + 1;
983 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
984 ip->i_flag |= IN_MODIFIED;
985 }
986 *vpp = vp;
987 return (0);
988}
989
990/*
991 * File handle to vnode
992 *
993 * Have to be really careful about stale file handles:
994 * - check that the inode number is valid
995 * - call ext2_vget() to get the locked inode
996 * - check for an unallocated inode (i_mode == 0)
997 * - check that the given client host has export rights and return
998 * those rights via. exflagsp and credanonp
999 */
1000static int
1001ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
1002{
1003 struct inode *ip;
1004 struct ufid *ufhp;
1005 struct vnode *nvp;
1006 struct m_ext2fs *fs;
1007 int error;
1008
1009 ufhp = (struct ufid *)fhp;
1010 fs = VFSTOEXT2(mp)->um_e2fs;
1011 if (ufhp->ufid_ino < EXT2_ROOTINO ||
1012 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg)
1013 return (ESTALE);
1014
1015 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
1016 if (error) {
1017 *vpp = NULLVP;
1018 return (error);
1019 }
1020 ip = VTOI(nvp);
1021 if (ip->i_mode == 0 ||
1022 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) {
1023 vput(nvp);
1024 *vpp = NULLVP;
1025 return (ESTALE);
1026 }
1027 *vpp = nvp;
1028 vnode_create_vobject(*vpp, 0, curthread);
1029 return (0);
1030}
1031
1032/*
1033 * Write a superblock and associated information back to disk.
1034 */
1035static int
1036ext2_sbupdate(struct ext2mount *mp, int waitfor)
1037{
1038 struct m_ext2fs *fs = mp->um_e2fs;
1039 struct ext2fs *es = fs->e2fs;
1040 struct buf *bp;
1041 int error = 0;
1042
1043 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0);
1044 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs));
1045 if (waitfor == MNT_WAIT)
1046 error = bwrite(bp);
1047 else
1048 bawrite(bp);
1049
1050 /*
1051 * The buffers for group descriptors, inode bitmaps and block bitmaps
1052 * are not busy at this point and are (hopefully) written by the
1053 * usual sync mechanism. No need to write them here.
1054 */
1055 return (error);
1056}
1057int
1058ext2_cgupdate(struct ext2mount *mp, int waitfor)
1059{
1060 struct m_ext2fs *fs = mp->um_e2fs;
1061 struct buf *bp;
1062 int i, error = 0, allerror = 0;
1063
1064 allerror = ext2_sbupdate(mp, waitfor);
1065 for (i = 0; i < fs->e2fs_gdbcount; i++) {
1066 bp = getblk(mp->um_devvp, fsbtodb(fs,
1067 fs->e2fs->e2fs_first_dblock +
1068 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0);
1069 e2fs_cgsave(&fs->e2fs_gd[
1070 i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
1071 (struct ext2_gd *)bp->b_data, fs->e2fs_bsize);
1072 if (waitfor == MNT_WAIT)
1073 error = bwrite(bp);
1074 else
1075 bawrite(bp);
1076 }
1077
1078 if (!allerror && error)
1079 allerror = error;
1080 return (allerror);
1081}
1082/*
1083 * Return the root of a filesystem.
1084 */
1085static int
1086ext2_root(struct mount *mp, int flags, struct vnode **vpp)
1087{
1088 struct vnode *nvp;
1089 int error;
1090
1091 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp);
1092 if (error)
1093 return (error);
1094 *vpp = nvp;
1095 return (0);
1096}
| 856 */
857 if (waitfor != MNT_LAZY) {
858 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
859 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
860 allerror = error;
861 VOP_UNLOCK(ump->um_devvp, 0);
862 }
863
864 /*
865 * Write back modified superblock.
866 */
867 if (fs->e2fs_fmod != 0) {
868 fs->e2fs_fmod = 0;
869 fs->e2fs->e2fs_wtime = time_second;
870 if ((error = ext2_cgupdate(ump, waitfor)) != 0)
871 allerror = error;
872 }
873 return (allerror);
874}
875
876/*
877 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it
878 * in from disk. If it is in core, wait for the lock bit to clear, then
879 * return the inode locked. Detection and handling of mount points must be
880 * done by the calling routine.
881 */
882static int
883ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
884{
885 struct m_ext2fs *fs;
886 struct inode *ip;
887 struct ext2mount *ump;
888 struct buf *bp;
889 struct vnode *vp;
890 struct cdev *dev;
891 struct thread *td;
892 int i, error;
893 int used_blocks;
894
895 td = curthread;
896 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL);
897 if (error || *vpp != NULL)
898 return (error);
899
900 ump = VFSTOEXT2(mp);
901 dev = ump->um_dev;
902 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO);
903
904 /* Allocate a new vnode/inode. */
905 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) {
906 *vpp = NULL;
907 free(ip, M_EXT2NODE);
908 return (error);
909 }
910 vp->v_data = ip;
911 ip->i_vnode = vp;
912 ip->i_e2fs = fs = ump->um_e2fs;
913 ip->i_ump = ump;
914 ip->i_number = ino;
915
916 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
917 error = insmntque(vp, mp);
918 if (error != 0) {
919 free(ip, M_EXT2NODE);
920 *vpp = NULL;
921 return (error);
922 }
923 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
924 if (error || *vpp != NULL)
925 return (error);
926
927 /* Read in the disk contents for the inode, copy into the inode. */
928 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
929 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
930 /*
931 * The inode does not contain anything useful, so it would
932 * be misleading to leave it on its hash chain. With mode
933 * still zero, it will be unlinked and returned to the free
934 * list by vput().
935 */
936 brelse(bp);
937 vput(vp);
938 *vpp = NULL;
939 return (error);
940 }
941 /* convert ext2 inode to dinode */
942 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) *
943 ino_to_fsbo(fs, ino)), ip);
944 ip->i_block_group = ino_to_cg(fs, ino);
945 ip->i_next_alloc_block = 0;
946 ip->i_next_alloc_goal = 0;
947
948 /*
949 * Now we want to make sure that block pointers for unused
950 * blocks are zeroed out - ext2_balloc depends on this
951 * although for regular files and directories only
952 */
953 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
954 used_blocks = (ip->i_size+fs->e2fs_bsize-1) / fs->e2fs_bsize;
955 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
956 ip->i_db[i] = 0;
957 }
958/*
959 ext2_print_inode(ip);
960*/
961 bqrelse(bp);
962
963 /*
964 * Initialize the vnode from the inode, check for aliases.
965 * Note that the underlying vnode may have changed.
966 */
967 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) {
968 vput(vp);
969 *vpp = NULL;
970 return (error);
971 }
972
973 /*
974 * Finish inode initialization.
975 */
976
977 /*
978 * Set up a generation number for this inode if it does not
979 * already have one. This should only happen on old filesystems.
980 */
981 if (ip->i_gen == 0) {
982 ip->i_gen = random() / 2 + 1;
983 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
984 ip->i_flag |= IN_MODIFIED;
985 }
986 *vpp = vp;
987 return (0);
988}
989
990/*
991 * File handle to vnode
992 *
993 * Have to be really careful about stale file handles:
994 * - check that the inode number is valid
995 * - call ext2_vget() to get the locked inode
996 * - check for an unallocated inode (i_mode == 0)
997 * - check that the given client host has export rights and return
998 * those rights via. exflagsp and credanonp
999 */
1000static int
1001ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
1002{
1003 struct inode *ip;
1004 struct ufid *ufhp;
1005 struct vnode *nvp;
1006 struct m_ext2fs *fs;
1007 int error;
1008
1009 ufhp = (struct ufid *)fhp;
1010 fs = VFSTOEXT2(mp)->um_e2fs;
1011 if (ufhp->ufid_ino < EXT2_ROOTINO ||
1012 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg)
1013 return (ESTALE);
1014
1015 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
1016 if (error) {
1017 *vpp = NULLVP;
1018 return (error);
1019 }
1020 ip = VTOI(nvp);
1021 if (ip->i_mode == 0 ||
1022 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) {
1023 vput(nvp);
1024 *vpp = NULLVP;
1025 return (ESTALE);
1026 }
1027 *vpp = nvp;
1028 vnode_create_vobject(*vpp, 0, curthread);
1029 return (0);
1030}
1031
1032/*
1033 * Write a superblock and associated information back to disk.
1034 */
1035static int
1036ext2_sbupdate(struct ext2mount *mp, int waitfor)
1037{
1038 struct m_ext2fs *fs = mp->um_e2fs;
1039 struct ext2fs *es = fs->e2fs;
1040 struct buf *bp;
1041 int error = 0;
1042
1043 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0);
1044 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs));
1045 if (waitfor == MNT_WAIT)
1046 error = bwrite(bp);
1047 else
1048 bawrite(bp);
1049
1050 /*
1051 * The buffers for group descriptors, inode bitmaps and block bitmaps
1052 * are not busy at this point and are (hopefully) written by the
1053 * usual sync mechanism. No need to write them here.
1054 */
1055 return (error);
1056}
1057int
1058ext2_cgupdate(struct ext2mount *mp, int waitfor)
1059{
1060 struct m_ext2fs *fs = mp->um_e2fs;
1061 struct buf *bp;
1062 int i, error = 0, allerror = 0;
1063
1064 allerror = ext2_sbupdate(mp, waitfor);
1065 for (i = 0; i < fs->e2fs_gdbcount; i++) {
1066 bp = getblk(mp->um_devvp, fsbtodb(fs,
1067 fs->e2fs->e2fs_first_dblock +
1068 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0);
1069 e2fs_cgsave(&fs->e2fs_gd[
1070 i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
1071 (struct ext2_gd *)bp->b_data, fs->e2fs_bsize);
1072 if (waitfor == MNT_WAIT)
1073 error = bwrite(bp);
1074 else
1075 bawrite(bp);
1076 }
1077
1078 if (!allerror && error)
1079 allerror = error;
1080 return (allerror);
1081}
1082/*
1083 * Return the root of a filesystem.
1084 */
1085static int
1086ext2_root(struct mount *mp, int flags, struct vnode **vpp)
1087{
1088 struct vnode *nvp;
1089 int error;
1090
1091 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp);
1092 if (error)
1093 return (error);
1094 *vpp = nvp;
1095 return (0);
1096}
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