MP Implementation 1/2: Get the APIC code working again, sweetly integrate the
[dragonfly.git] / sys / vfs / gnu / ext2fs / ext2_vfsops.c
CommitLineData
984263bc
MD
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 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 * @(#)ffs_vfsops.c 8.8 (Berkeley) 4/18/94
40 * $FreeBSD: src/sys/gnu/ext2fs/ext2_vfsops.c,v 1.63.2.7 2002/07/01 00:18:51 iedowse Exp $
8a8d5d85 41 * $DragonFly: src/sys/vfs/gnu/ext2fs/ext2_vfsops.c,v 1.4 2003/07/06 21:23:48 dillon Exp $
984263bc
MD
42 */
43
44#include "opt_quota.h"
45
46#include <sys/param.h>
47#include <sys/systm.h>
48#include <sys/namei.h>
49#include <sys/proc.h>
50#include <sys/kernel.h>
51#include <sys/vnode.h>
52#include <sys/mount.h>
53#include <sys/buf.h>
54#include <sys/conf.h>
55#include <sys/fcntl.h>
56#include <sys/disklabel.h>
57#include <sys/malloc.h>
58#include <sys/stat.h>
59
60#include <ufs/ufs/quota.h>
61#include <ufs/ufs/ufsmount.h>
62#include <ufs/ufs/inode.h>
63#include <ufs/ufs/ufs_extern.h>
64
65#include <vm/vm_zone.h>
66
67#include <gnu/ext2fs/fs.h>
68#include <gnu/ext2fs/ext2_extern.h>
69#include <gnu/ext2fs/ext2_fs.h>
70#include <gnu/ext2fs/ext2_fs_sb.h>
71
72static int ext2_fhtovp __P((struct mount *, struct fid *, struct vnode **));
73static int ext2_flushfiles __P((struct mount *mp, int flags, struct proc *p));
74static int ext2_mount __P((struct mount *,
75 char *, caddr_t, struct nameidata *, struct proc *));
76static int ext2_mountfs __P((struct vnode *, struct mount *, struct proc *));
77static int ext2_reload __P((struct mount *mountp, struct ucred *cred,
78 struct proc *p));
79static int ext2_sbupdate __P((struct ufsmount *, int));
80static int ext2_statfs __P((struct mount *, struct statfs *, struct proc *));
81static int ext2_sync __P((struct mount *, int, struct ucred *, struct proc *));
82static int ext2_unmount __P((struct mount *, int, struct proc *));
83static int ext2_vget __P((struct mount *, ino_t, struct vnode **));
84static int ext2_vptofh __P((struct vnode *, struct fid *));
85
86static MALLOC_DEFINE(M_EXT2NODE, "EXT2 node", "EXT2 vnode private part");
87
88static struct vfsops ext2fs_vfsops = {
89 ext2_mount,
90 ufs_start, /* empty function */
91 ext2_unmount,
92 ufs_root, /* root inode via vget */
93 ufs_quotactl, /* does operations associated with quotas */
94 ext2_statfs,
95 ext2_sync,
96 ext2_vget,
97 ext2_fhtovp,
98 ufs_check_export,
99 ext2_vptofh,
100 ext2_init,
101 vfs_stduninit,
102 vfs_stdextattrctl,
103};
104
105VFS_SET(ext2fs_vfsops, ext2fs, 0);
106#define bsd_malloc malloc
107#define bsd_free free
108
109static int ext2fs_inode_hash_lock;
110
111static int ext2_check_sb_compat __P((struct ext2_super_block *es,
112 dev_t dev, int ronly));
113static int compute_sb_data __P((struct vnode * devvp,
114 struct ext2_super_block * es,
115 struct ext2_sb_info * fs));
116
117#ifdef notyet
118static int ext2_mountroot __P((void));
119
120/*
121 * Called by main() when ext2fs is going to be mounted as root.
122 *
123 * Name is updated by mount(8) after booting.
124 */
125#define ROOTNAME "root_device"
126
127static int
128ext2_mountroot()
129{
130 register struct ext2_sb_info *fs;
131 register struct mount *mp;
132 struct proc *p = curproc;
133 struct ufsmount *ump;
134 u_int size;
135 int error;
136
137 if ((error = bdevvp(rootdev, &rootvp))) {
138 printf("ext2_mountroot: can't find rootvp\n");
139 return (error);
140 }
141 mp = bsd_malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
142 bzero((char *)mp, (u_long)sizeof(struct mount));
143 TAILQ_INIT(&mp->mnt_nvnodelist);
144 TAILQ_INIT(&mp->mnt_reservedvnlist);
145 mp->mnt_op = &ext2fs_vfsops;
146 mp->mnt_flag = MNT_RDONLY;
147 if (error = ext2_mountfs(rootvp, mp, p)) {
148 bsd_free(mp, M_MOUNT);
149 return (error);
150 }
151 if (error = vfs_lock(mp)) {
152 (void)ext2_unmount(mp, 0, p);
153 bsd_free(mp, M_MOUNT);
154 return (error);
155 }
156 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list);
157 mp->mnt_flag |= MNT_ROOTFS;
158 mp->mnt_vnodecovered = NULLVP;
159 ump = VFSTOUFS(mp);
160 fs = ump->um_e2fs;
161 bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt));
162 fs->fs_fsmnt[0] = '/';
163 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
164 MNAMELEN);
165 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
166 &size);
167 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
168 (void)ext2_statfs(mp, &mp->mnt_stat, p);
169 vfs_unlock(mp);
170 inittodr(fs->s_es->s_wtime); /* this helps to set the time */
171 return (0);
172}
173#endif
174
175/*
176 * VFS Operations.
177 *
178 * mount system call
179 */
180static int
181ext2_mount(mp, path, data, ndp, p)
182 register struct mount *mp;
183 char *path;
184 caddr_t data; /* this is actually a (struct ufs_args *) */
185 struct nameidata *ndp;
186 struct proc *p;
187{
188 struct vnode *devvp;
189 struct ufs_args args;
190 struct ufsmount *ump = 0;
191 register struct ext2_sb_info *fs;
192 size_t size;
193 int error, flags;
194 mode_t accessmode;
195
196 if ((error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args))) != 0)
197 return (error);
198 /*
199 * If updating, check whether changing from read-only to
200 * read/write; if there is no device name, that's all we do.
201 */
202 if (mp->mnt_flag & MNT_UPDATE) {
203 ump = VFSTOUFS(mp);
204 fs = ump->um_e2fs;
205 error = 0;
206 if (fs->s_rd_only == 0 && (mp->mnt_flag & MNT_RDONLY)) {
207 flags = WRITECLOSE;
208 if (mp->mnt_flag & MNT_FORCE)
209 flags |= FORCECLOSE;
210 if (vfs_busy(mp, LK_NOWAIT, 0, p))
211 return (EBUSY);
212 error = ext2_flushfiles(mp, flags, p);
213 vfs_unbusy(mp, p);
214 if (!error && fs->s_wasvalid) {
215 fs->s_es->s_state |= EXT2_VALID_FS;
216 ext2_sbupdate(ump, MNT_WAIT);
217 }
218 fs->s_rd_only = 1;
219 }
220 if (!error && (mp->mnt_flag & MNT_RELOAD))
221 error = ext2_reload(mp, ndp->ni_cnd.cn_cred, p);
222 if (error)
223 return (error);
224 devvp = ump->um_devvp;
225 if (ext2_check_sb_compat(fs->s_es, devvp->v_rdev,
226 (mp->mnt_kern_flag & MNTK_WANTRDWR) == 0) != 0)
227 return (EPERM);
228 if (fs->s_rd_only && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
229 /*
230 * If upgrade to read-write by non-root, then verify
231 * that user has necessary permissions on the device.
232 */
233 if (p->p_ucred->cr_uid != 0) {
234 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
235 if ((error = VOP_ACCESS(devvp, VREAD | VWRITE,
236 p->p_ucred, p)) != 0) {
237 VOP_UNLOCK(devvp, 0, p);
238 return (error);
239 }
240 VOP_UNLOCK(devvp, 0, p);
241 }
242
243 if ((fs->s_es->s_state & EXT2_VALID_FS) == 0 ||
244 (fs->s_es->s_state & EXT2_ERROR_FS)) {
245 if (mp->mnt_flag & MNT_FORCE) {
246 printf(
247"WARNING: %s was not properly dismounted\n",
248 fs->fs_fsmnt);
249 } else {
250 printf(
251"WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
252 fs->fs_fsmnt);
253 return (EPERM);
254 }
255 }
256 fs->s_es->s_state &= ~EXT2_VALID_FS;
257 ext2_sbupdate(ump, MNT_WAIT);
258 fs->s_rd_only = 0;
259 }
260 if (args.fspec == 0) {
261 /*
262 * Process export requests.
263 */
264 return (vfs_export(mp, &ump->um_export, &args.export));
265 }
266 }
267 /*
268 * Not an update, or updating the name: look up the name
269 * and verify that it refers to a sensible block device.
270 */
271 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
272 if ((error = namei(ndp)) != 0)
273 return (error);
274 NDFREE(ndp, NDF_ONLY_PNBUF);
275 devvp = ndp->ni_vp;
276
277 if (!vn_isdisk(devvp, &error)) {
278 vrele(devvp);
279 return (error);
280 }
281
282 /*
283 * If mount by non-root, then verify that user has necessary
284 * permissions on the device.
285 */
286 if (p->p_ucred->cr_uid != 0) {
287 accessmode = VREAD;
288 if ((mp->mnt_flag & MNT_RDONLY) == 0)
289 accessmode |= VWRITE;
290 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
291 if ((error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p)) != 0) {
292 vput(devvp);
293 return (error);
294 }
295 VOP_UNLOCK(devvp, 0, p);
296 }
297
298 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
299 error = ext2_mountfs(devvp, mp, p);
300 } else {
301 if (devvp != ump->um_devvp)
302 error = EINVAL; /* needs translation */
303 else
304 vrele(devvp);
305 }
306 if (error) {
307 vrele(devvp);
308 return (error);
309 }
310 ump = VFSTOUFS(mp);
311 fs = ump->um_e2fs;
312 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
313 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
314 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
315 MNAMELEN);
316 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
317 &size);
318 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
319 (void)ext2_statfs(mp, &mp->mnt_stat, p);
320 return (0);
321}
322
323/*
324 * checks that the data in the descriptor blocks make sense
325 * this is taken from ext2/super.c
326 */
327static int ext2_check_descriptors (struct ext2_sb_info * sb)
328{
329 int i;
330 int desc_block = 0;
331 unsigned long block = sb->s_es->s_first_data_block;
332 struct ext2_group_desc * gdp = NULL;
333
334 /* ext2_debug ("Checking group descriptors"); */
335
336 for (i = 0; i < sb->s_groups_count; i++)
337 {
338 /* examine next descriptor block */
339 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
340 gdp = (struct ext2_group_desc *)
341 sb->s_group_desc[desc_block++]->b_data;
342 if (gdp->bg_block_bitmap < block ||
343 gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
344 {
345 printf ("ext2_check_descriptors: "
346 "Block bitmap for group %d"
347 " not in group (block %lu)!\n",
348 i, (unsigned long) gdp->bg_block_bitmap);
349 return 0;
350 }
351 if (gdp->bg_inode_bitmap < block ||
352 gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
353 {
354 printf ("ext2_check_descriptors: "
355 "Inode bitmap for group %d"
356 " not in group (block %lu)!\n",
357 i, (unsigned long) gdp->bg_inode_bitmap);
358 return 0;
359 }
360 if (gdp->bg_inode_table < block ||
361 gdp->bg_inode_table + sb->s_itb_per_group >=
362 block + EXT2_BLOCKS_PER_GROUP(sb))
363 {
364 printf ("ext2_check_descriptors: "
365 "Inode table for group %d"
366 " not in group (block %lu)!\n",
367 i, (unsigned long) gdp->bg_inode_table);
368 return 0;
369 }
370 block += EXT2_BLOCKS_PER_GROUP(sb);
371 gdp++;
372 }
373 return 1;
374}
375
376static int
377ext2_check_sb_compat(es, dev, ronly)
378 struct ext2_super_block *es;
379 dev_t dev;
380 int ronly;
381{
382
383 if (es->s_magic != EXT2_SUPER_MAGIC) {
384 printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n",
385 devtoname(dev), es->s_magic, EXT2_SUPER_MAGIC);
386 return (1);
387 }
388 if (es->s_rev_level > EXT2_GOOD_OLD_REV) {
389 if (es->s_feature_incompat & ~EXT2_FEATURE_INCOMPAT_SUPP) {
390 printf(
391"WARNING: mount of %s denied due to unsupported optional features\n",
392 devtoname(dev));
393 return (1);
394 }
395 if (!ronly &&
396 (es->s_feature_ro_compat & ~EXT2_FEATURE_RO_COMPAT_SUPP)) {
397 printf(
398"WARNING: R/W mount of %s denied due to unsupported optional features\n",
399 devtoname(dev));
400 return (1);
401 }
402 }
403 return (0);
404}
405
406/*
407 * this computes the fields of the ext2_sb_info structure from the
408 * data in the ext2_super_block structure read in
409 */
410static int compute_sb_data(devvp, es, fs)
411 struct vnode * devvp;
412 struct ext2_super_block * es;
413 struct ext2_sb_info * fs;
414{
415 int db_count, error;
416 int i, j;
417 int logic_sb_block = 1; /* XXX for now */
418
419#if 1
420#define V(v)
421#else
422#define V(v) printf(#v"= %d\n", fs->v);
423#endif
424
425 fs->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
426 V(s_blocksize)
427 fs->s_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->s_log_block_size;
428 V(s_bshift)
429 fs->s_fsbtodb = es->s_log_block_size + 1;
430 V(s_fsbtodb)
431 fs->s_qbmask = fs->s_blocksize - 1;
432 V(s_bmask)
433 fs->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(es);
434 V(s_blocksize_bits)
435 fs->s_frag_size = EXT2_MIN_FRAG_SIZE << es->s_log_frag_size;
436 V(s_frag_size)
437 if (fs->s_frag_size)
438 fs->s_frags_per_block = fs->s_blocksize / fs->s_frag_size;
439 V(s_frags_per_block)
440 fs->s_blocks_per_group = es->s_blocks_per_group;
441 V(s_blocks_per_group)
442 fs->s_frags_per_group = es->s_frags_per_group;
443 V(s_frags_per_group)
444 fs->s_inodes_per_group = es->s_inodes_per_group;
445 V(s_inodes_per_group)
446 fs->s_inodes_per_block = fs->s_blocksize / EXT2_INODE_SIZE;
447 V(s_inodes_per_block)
448 fs->s_itb_per_group = fs->s_inodes_per_group /fs->s_inodes_per_block;
449 V(s_itb_per_group)
450 fs->s_desc_per_block = fs->s_blocksize / sizeof (struct ext2_group_desc);
451 V(s_desc_per_block)
452 /* s_resuid / s_resgid ? */
453 fs->s_groups_count = (es->s_blocks_count -
454 es->s_first_data_block +
455 EXT2_BLOCKS_PER_GROUP(fs) - 1) /
456 EXT2_BLOCKS_PER_GROUP(fs);
457 V(s_groups_count)
458 db_count = (fs->s_groups_count + EXT2_DESC_PER_BLOCK(fs) - 1) /
459 EXT2_DESC_PER_BLOCK(fs);
460 fs->s_db_per_group = db_count;
461 V(s_db_per_group)
462
463 fs->s_group_desc = bsd_malloc(db_count * sizeof (struct buf *),
464 M_UFSMNT, M_WAITOK);
465
466 /* adjust logic_sb_block */
467 if(fs->s_blocksize > SBSIZE)
468 /* Godmar thinks: if the blocksize is greater than 1024, then
469 the superblock is logically part of block zero.
470 */
471 logic_sb_block = 0;
472
473 for (i = 0; i < db_count; i++) {
474 error = bread(devvp , fsbtodb(fs, logic_sb_block + i + 1),
475 fs->s_blocksize, NOCRED, &fs->s_group_desc[i]);
476 if(error) {
477 for (j = 0; j < i; j++)
478 brelse(fs->s_group_desc[j]);
479 bsd_free(fs->s_group_desc, M_UFSMNT);
480 printf("EXT2-fs: unable to read group descriptors (%d)\n", error);
481 return EIO;
482 }
483 /* Set the B_LOCKED flag on the buffer, then brelse() it */
484 LCK_BUF(fs->s_group_desc[i])
485 }
486 if(!ext2_check_descriptors(fs)) {
487 for (j = 0; j < db_count; j++)
488 ULCK_BUF(fs->s_group_desc[j])
489 bsd_free(fs->s_group_desc, M_UFSMNT);
490 printf("EXT2-fs: (ext2_check_descriptors failure) "
491 "unable to read group descriptors\n");
492 return EIO;
493 }
494
495 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
496 fs->s_inode_bitmap_number[i] = 0;
497 fs->s_inode_bitmap[i] = NULL;
498 fs->s_block_bitmap_number[i] = 0;
499 fs->s_block_bitmap[i] = NULL;
500 }
501 fs->s_loaded_inode_bitmaps = 0;
502 fs->s_loaded_block_bitmaps = 0;
503 return 0;
504}
505
506/*
507 * Reload all incore data for a filesystem (used after running fsck on
508 * the root filesystem and finding things to fix). The filesystem must
509 * be mounted read-only.
510 *
511 * Things to do to update the mount:
512 * 1) invalidate all cached meta-data.
513 * 2) re-read superblock from disk.
514 * 3) re-read summary information from disk.
515 * 4) invalidate all inactive vnodes.
516 * 5) invalidate all cached file data.
517 * 6) re-read inode data for all active vnodes.
518 */
519static int
520ext2_reload(mountp, cred, p)
521 register struct mount *mountp;
522 struct ucred *cred;
523 struct proc *p;
524{
525 register struct vnode *vp, *nvp, *devvp;
526 struct inode *ip;
527 struct buf *bp;
528 struct ext2_super_block * es;
529 struct ext2_sb_info *fs;
530 int error;
8a8d5d85 531 int gen;
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MD
532
533 if ((mountp->mnt_flag & MNT_RDONLY) == 0)
534 return (EINVAL);
535 /*
536 * Step 1: invalidate all cached meta-data.
537 */
538 devvp = VFSTOUFS(mountp)->um_devvp;
3b568787 539 if (vinvalbuf(devvp, 0, p, 0, 0))
984263bc
MD
540 panic("ext2_reload: dirty1");
541 /*
542 * Step 2: re-read superblock from disk.
543 * constants have been adjusted for ext2
544 */
545 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
546 return (error);
547 es = (struct ext2_super_block *)bp->b_data;
548 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
549 brelse(bp);
550 return (EIO); /* XXX needs translation */
551 }
552 fs = VFSTOUFS(mountp)->um_e2fs;
553 bcopy(bp->b_data, fs->s_es, sizeof(struct ext2_super_block));
554
555 if((error = compute_sb_data(devvp, es, fs)) != 0) {
556 brelse(bp);
557 return error;
558 }
559#ifdef UNKLAR
560 if (fs->fs_sbsize < SBSIZE)
561 bp->b_flags |= B_INVAL;
562#endif
563 brelse(bp);
564
8a8d5d85 565 gen = lwkt_gettoken(&mntvnode_token);
984263bc 566loop:
984263bc 567 for (vp = TAILQ_FIRST(&mountp->mnt_nvnodelist); vp != NULL; vp = nvp) {
8a8d5d85 568 KKASSERT(vp->v_mount == mountp);
984263bc
MD
569 nvp = TAILQ_NEXT(vp, v_nmntvnodes);
570 /*
571 * Step 4: invalidate all inactive vnodes.
572 */
8a8d5d85
MD
573 if (vrecycle(vp, NULL, p)) {
574 lwkt_gentoken(&mntvnode_token, &gen);
984263bc 575 goto loop;
8a8d5d85 576 }
984263bc
MD
577 /*
578 * Step 5: invalidate all cached file data.
579 */
8a8d5d85
MD
580 lwkt_gettoken(&vp->v_interlock);
581 if (lwkt_gentoken(&mntvnode_token, &gen)) {
582 lwkt_reltoken(&vp->v_interlock);
583 goto loop;
584 }
984263bc 585 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p)) {
8a8d5d85 586 lwkt_gentoken(&mntvnode_token, &gen);
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MD
587 goto loop;
588 }
3b568787 589 if (vinvalbuf(vp, 0, p, 0, 0))
984263bc
MD
590 panic("ext2_reload: dirty2");
591 /*
592 * Step 6: re-read inode data for all active vnodes.
593 */
594 ip = VTOI(vp);
595 error =
596 bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
597 (int)fs->s_blocksize, NOCRED, &bp);
598 if (error) {
599 vput(vp);
600 return (error);
601 }
602 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data +
603 EXT2_INODE_SIZE * ino_to_fsbo(fs, ip->i_number)),
604 &ip->i_din);
605 brelse(bp);
606 vput(vp);
8a8d5d85
MD
607 if (lwkt_gentoken(&mntvnode_token, &gen))
608 goto loop;
984263bc 609 }
8a8d5d85 610 lwkt_reltoken(&mntvnode_token);
984263bc
MD
611 return (0);
612}
613
614/*
615 * Common code for mount and mountroot
616 */
617static int
618ext2_mountfs(devvp, mp, p)
619 register struct vnode *devvp;
620 struct mount *mp;
621 struct proc *p;
622{
623 register struct ufsmount *ump;
624 struct buf *bp;
625 register struct ext2_sb_info *fs;
626 struct ext2_super_block * es;
627 dev_t dev = devvp->v_rdev;
628 struct partinfo dpart;
629 int havepart = 0;
630 int error, i, size;
631 int ronly;
632
633 /*
634 * Disallow multiple mounts of the same device.
635 * Disallow mounting of a device that is currently in use
636 * (except for root, which might share swap device for miniroot).
637 * Flush out any old buffers remaining from a previous use.
638 */
639 if ((error = vfs_mountedon(devvp)) != 0)
640 return (error);
641 if (vcount(devvp) > 1 && devvp != rootvp)
642 return (EBUSY);
3b568787 643 if ((error = vinvalbuf(devvp, V_SAVE, p, 0, 0)) != 0)
984263bc
MD
644 return (error);
645#ifdef READONLY
646/* turn on this to force it to be read-only */
647 mp->mnt_flag |= MNT_RDONLY;
648#endif
649
650 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
651 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
652 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p);
653 VOP_UNLOCK(devvp, 0, p);
654 if (error)
655 return (error);
656 if (devvp->v_rdev->si_iosize_max != 0)
657 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
658 if (mp->mnt_iosize_max > MAXPHYS)
659 mp->mnt_iosize_max = MAXPHYS;
660 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0)
661 size = DEV_BSIZE;
662 else {
663 havepart = 1;
664 size = dpart.disklab->d_secsize;
665 }
666
667 bp = NULL;
668 ump = NULL;
669 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
670 goto out;
671 es = (struct ext2_super_block *)bp->b_data;
672 if (ext2_check_sb_compat(es, dev, ronly) != 0) {
673 error = EINVAL; /* XXX needs translation */
674 goto out;
675 }
676 if ((es->s_state & EXT2_VALID_FS) == 0 ||
677 (es->s_state & EXT2_ERROR_FS)) {
678 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
679 printf(
680"WARNING: Filesystem was not properly dismounted\n");
681 } else {
682 printf(
683"WARNING: R/W mount denied. Filesystem is not clean - run fsck\n");
684 error = EPERM;
685 goto out;
686 }
687 }
688 ump = bsd_malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
689 bzero((caddr_t)ump, sizeof *ump);
690 ump->um_malloctype = M_EXT2NODE;
691 ump->um_blkatoff = ext2_blkatoff;
692 ump->um_truncate = ext2_truncate;
693 ump->um_update = ext2_update;
694 ump->um_valloc = ext2_valloc;
695 ump->um_vfree = ext2_vfree;
696 /* I don't know whether this is the right strategy. Note that
697 we dynamically allocate both a ext2_sb_info and a ext2_super_block
698 while Linux keeps the super block in a locked buffer
699 */
700 ump->um_e2fs = bsd_malloc(sizeof(struct ext2_sb_info),
701 M_UFSMNT, M_WAITOK);
702 ump->um_e2fs->s_es = bsd_malloc(sizeof(struct ext2_super_block),
703 M_UFSMNT, M_WAITOK);
704 bcopy(es, ump->um_e2fs->s_es, (u_int)sizeof(struct ext2_super_block));
705 if ((error = compute_sb_data(devvp, ump->um_e2fs->s_es, ump->um_e2fs)))
706 goto out;
707 /*
708 * We don't free the group descriptors allocated by compute_sb_data()
709 * until ext2_unmount(). This is OK since the mount will succeed.
710 */
711 brelse(bp);
712 bp = NULL;
713 fs = ump->um_e2fs;
714 fs->s_rd_only = ronly; /* ronly is set according to mnt_flags */
715 /* if the fs is not mounted read-only, make sure the super block is
716 always written back on a sync()
717 */
718 fs->s_wasvalid = fs->s_es->s_state & EXT2_VALID_FS ? 1 : 0;
719 if (ronly == 0) {
720 fs->s_dirt = 1; /* mark it modified */
721 fs->s_es->s_state &= ~EXT2_VALID_FS; /* set fs invalid */
722 }
723 mp->mnt_data = (qaddr_t)ump;
724 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
725 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
726 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
727 mp->mnt_flag |= MNT_LOCAL;
728 ump->um_mountp = mp;
729 ump->um_dev = dev;
730 ump->um_devvp = devvp;
731 /* setting those two parameters allows us to use
732 ufs_bmap w/o changse !
733 */
734 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
735 ump->um_bptrtodb = fs->s_es->s_log_block_size + 1;
736 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
737 for (i = 0; i < MAXQUOTAS; i++)
738 ump->um_quotas[i] = NULLVP;
739 devvp->v_specmountpoint = mp;
740 if (ronly == 0)
741 ext2_sbupdate(ump, MNT_WAIT);
742 return (0);
743out:
744 if (bp)
745 brelse(bp);
746 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
747 if (ump) {
748 bsd_free(ump->um_e2fs->s_es, M_UFSMNT);
749 bsd_free(ump->um_e2fs, M_UFSMNT);
750 bsd_free(ump, M_UFSMNT);
751 mp->mnt_data = (qaddr_t)0;
752 }
753 return (error);
754}
755
756/*
757 * unmount system call
758 */
759static int
760ext2_unmount(mp, mntflags, p)
761 struct mount *mp;
762 int mntflags;
763 struct proc *p;
764{
765 register struct ufsmount *ump;
766 register struct ext2_sb_info *fs;
767 int error, flags, ronly, i;
768
769 flags = 0;
770 if (mntflags & MNT_FORCE) {
771 if (mp->mnt_flag & MNT_ROOTFS)
772 return (EINVAL);
773 flags |= FORCECLOSE;
774 }
775 if ((error = ext2_flushfiles(mp, flags, p)) != 0)
776 return (error);
777 ump = VFSTOUFS(mp);
778 fs = ump->um_e2fs;
779 ronly = fs->s_rd_only;
780 if (ronly == 0) {
781 if (fs->s_wasvalid)
782 fs->s_es->s_state |= EXT2_VALID_FS;
783 ext2_sbupdate(ump, MNT_WAIT);
784 }
785
786 /* release buffers containing group descriptors */
787 for(i = 0; i < fs->s_db_per_group; i++)
788 ULCK_BUF(fs->s_group_desc[i])
789 bsd_free(fs->s_group_desc, M_UFSMNT);
790
791 /* release cached inode/block bitmaps */
792 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
793 if (fs->s_inode_bitmap[i])
794 ULCK_BUF(fs->s_inode_bitmap[i])
795
796 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
797 if (fs->s_block_bitmap[i])
798 ULCK_BUF(fs->s_block_bitmap[i])
799
800 ump->um_devvp->v_specmountpoint = NULL;
801 error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE,
802 NOCRED, p);
803 vrele(ump->um_devvp);
804 bsd_free(fs->s_es, M_UFSMNT);
805 bsd_free(fs, M_UFSMNT);
806 bsd_free(ump, M_UFSMNT);
807 mp->mnt_data = (qaddr_t)0;
808 mp->mnt_flag &= ~MNT_LOCAL;
809 return (error);
810}
811
812/*
813 * Flush out all the files in a filesystem.
814 */
815static int
816ext2_flushfiles(mp, flags, p)
817 register struct mount *mp;
818 int flags;
819 struct proc *p;
820{
821 register struct ufsmount *ump;
822 int error;
823#if QUOTA
824 int i;
825#endif
826
827 ump = VFSTOUFS(mp);
828#if QUOTA
829 if (mp->mnt_flag & MNT_QUOTA) {
830 if ((error = vflush(mp, 0, SKIPSYSTEM|flags)) != 0)
831 return (error);
832 for (i = 0; i < MAXQUOTAS; i++) {
833 if (ump->um_quotas[i] == NULLVP)
834 continue;
835 quotaoff(p, mp, i);
836 }
837 /*
838 * Here we fall through to vflush again to ensure
839 * that we have gotten rid of all the system vnodes.
840 */
841 }
842#endif
843 error = vflush(mp, 0, flags);
844 return (error);
845}
846
847/*
848 * Get file system statistics.
849 * taken from ext2/super.c ext2_statfs
850 */
851static int
852ext2_statfs(mp, sbp, p)
853 struct mount *mp;
854 register struct statfs *sbp;
855 struct proc *p;
856{
857 unsigned long overhead;
858 register struct ufsmount *ump;
859 register struct ext2_sb_info *fs;
860 register struct ext2_super_block *es;
861 int i, nsb;
862
863 ump = VFSTOUFS(mp);
864 fs = ump->um_e2fs;
865 es = fs->s_es;
866
867 if (es->s_magic != EXT2_SUPER_MAGIC)
868 panic("ext2_statfs - magic number spoiled");
869
870 /*
871 * Compute the overhead (FS structures)
872 */
873 if (es->s_feature_ro_compat & EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER) {
874 nsb = 0;
875 for (i = 0 ; i < fs->s_groups_count; i++)
876 if (ext2_group_sparse(i))
877 nsb++;
878 } else
879 nsb = fs->s_groups_count;
880 overhead = es->s_first_data_block +
881 /* Superblocks and block group descriptors: */
882 nsb * (1 + fs->s_db_per_group) +
883 /* Inode bitmap, block bitmap, and inode table: */
884 fs->s_groups_count * (1 + 1 + fs->s_itb_per_group);
885
886 sbp->f_bsize = EXT2_FRAG_SIZE(fs);
887 sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
888 sbp->f_blocks = es->s_blocks_count - overhead;
889 sbp->f_bfree = es->s_free_blocks_count;
890 sbp->f_bavail = sbp->f_bfree - es->s_r_blocks_count;
891 sbp->f_files = es->s_inodes_count;
892 sbp->f_ffree = es->s_free_inodes_count;
893 if (sbp != &mp->mnt_stat) {
894 sbp->f_type = mp->mnt_vfc->vfc_typenum;
895 bcopy((caddr_t)mp->mnt_stat.f_mntonname,
896 (caddr_t)&sbp->f_mntonname[0], MNAMELEN);
897 bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
898 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
899 }
900 return (0);
901}
902
903/*
904 * Go through the disk queues to initiate sandbagged IO;
905 * go through the inodes to write those that have been modified;
906 * initiate the writing of the super block if it has been modified.
907 *
908 * Note: we are always called with the filesystem marked `MPBUSY'.
909 */
910static int
911ext2_sync(mp, waitfor, cred, p)
912 struct mount *mp;
913 int waitfor;
914 struct ucred *cred;
915 struct proc *p;
916{
917 struct vnode *nvp, *vp;
918 struct inode *ip;
919 struct ufsmount *ump = VFSTOUFS(mp);
920 struct ext2_sb_info *fs;
921 int error, allerror = 0;
8a8d5d85 922 int gen;
984263bc
MD
923
924 fs = ump->um_e2fs;
925 if (fs->s_dirt != 0 && fs->s_rd_only != 0) { /* XXX */
926 printf("fs = %s\n", fs->fs_fsmnt);
927 panic("ext2_sync: rofs mod");
928 }
929 /*
930 * Write back each (modified) inode.
931 */
8a8d5d85 932 gen = lwkt_gettoken(&mntvnode_token);
984263bc
MD
933loop:
934 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) {
935 /*
936 * If the vnode that we are about to sync is no longer
937 * associated with this mount point, start over.
938 */
8a8d5d85
MD
939 if (vp->v_mount != mp) {
940 lwkt_gentoken(&mntvnode_token, &gen);
941 goto loop;
942 }
943 lwkt_gettoken(&vp->v_interlock);
944 if (lwkt_gentoken(&mntvnode_token, &gen)) {
945 lwkt_reltoken(&vp->v_interlock);
984263bc 946 goto loop;
8a8d5d85 947 }
984263bc
MD
948 nvp = TAILQ_NEXT(vp, v_nmntvnodes);
949 ip = VTOI(vp);
950 if (vp->v_type == VNON ||
951 ((ip->i_flag &
952 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
953 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY))) {
8a8d5d85 954 lwkt_reltoken(&vp->v_interlock);
984263bc
MD
955 continue;
956 }
984263bc
MD
957 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, p);
958 if (error) {
984263bc
MD
959 if (error == ENOENT)
960 goto loop;
961 continue;
962 }
963 if ((error = VOP_FSYNC(vp, cred, waitfor, p)) != 0)
964 allerror = error;
965 VOP_UNLOCK(vp, 0, p);
966 vrele(vp);
8a8d5d85 967 lwkt_gentoken(&mntvnode_token, &gen);
984263bc 968 }
8a8d5d85 969 lwkt_reltoken(&mntvnode_token);
984263bc
MD
970 /*
971 * Force stale file system control information to be flushed.
972 */
973 if (waitfor != MNT_LAZY) {
974 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, p);
975 if ((error = VOP_FSYNC(ump->um_devvp, cred, waitfor, p)) != 0)
976 allerror = error;
977 VOP_UNLOCK(ump->um_devvp, 0, p);
978 }
979#if QUOTA
980 qsync(mp);
981#endif
982 /*
983 * Write back modified superblock.
984 */
985 if (fs->s_dirt != 0) {
986 fs->s_dirt = 0;
987 fs->s_es->s_wtime = time_second;
988 if ((error = ext2_sbupdate(ump, waitfor)) != 0)
989 allerror = error;
990 }
991 return (allerror);
992}
993
994/*
995 * Look up a EXT2FS dinode number to find its incore vnode, otherwise read it
996 * in from disk. If it is in core, wait for the lock bit to clear, then
997 * return the inode locked. Detection and handling of mount points must be
998 * done by the calling routine.
999 */
1000static int
1001ext2_vget(mp, ino, vpp)
1002 struct mount *mp;
1003 ino_t ino;
1004 struct vnode **vpp;
1005{
1006 register struct ext2_sb_info *fs;
1007 register struct inode *ip;
1008 struct ufsmount *ump;
1009 struct buf *bp;
1010 struct vnode *vp;
1011 dev_t dev;
1012 int i, error;
1013 int used_blocks;
1014
1015 ump = VFSTOUFS(mp);
1016 dev = ump->um_dev;
1017restart:
1018 if ((*vpp = ufs_ihashget(dev, ino)) != NULL)
1019 return (0);
1020
1021 /*
1022 * Lock out the creation of new entries in the FFS hash table in
1023 * case getnewvnode() or MALLOC() blocks, otherwise a duplicate
1024 * may occur!
1025 */
1026 if (ext2fs_inode_hash_lock) {
1027 while (ext2fs_inode_hash_lock) {
1028 ext2fs_inode_hash_lock = -1;
1029 tsleep(&ext2fs_inode_hash_lock, PVM, "e2vget", 0);
1030 }
1031 goto restart;
1032 }
1033 ext2fs_inode_hash_lock = 1;
1034
1035 /*
1036 * If this MALLOC() is performed after the getnewvnode()
1037 * it might block, leaving a vnode with a NULL v_data to be
1038 * found by ext2_sync() if a sync happens to fire right then,
1039 * which will cause a panic because ext2_sync() blindly
1040 * dereferences vp->v_data (as well it should).
1041 */
1042 MALLOC(ip, struct inode *, sizeof(struct inode), M_EXT2NODE, M_WAITOK);
1043
1044 /* Allocate a new vnode/inode. */
1045 if ((error = getnewvnode(VT_UFS, mp, ext2_vnodeop_p, &vp)) != 0) {
1046 if (ext2fs_inode_hash_lock < 0)
1047 wakeup(&ext2fs_inode_hash_lock);
1048 ext2fs_inode_hash_lock = 0;
1049 *vpp = NULL;
1050 FREE(ip, M_EXT2NODE);
1051 return (error);
1052 }
1053 bzero((caddr_t)ip, sizeof(struct inode));
1054 lockinit(&ip->i_lock, PINOD, "ext2in", 0, 0);
1055 vp->v_data = ip;
1056 ip->i_vnode = vp;
1057 ip->i_e2fs = fs = ump->um_e2fs;
1058 ip->i_dev = dev;
1059 ip->i_number = ino;
1060#if QUOTA
1061 for (i = 0; i < MAXQUOTAS; i++)
1062 ip->i_dquot[i] = NODQUOT;
1063#endif
1064 /*
1065 * Put it onto its hash chain and lock it so that other requests for
1066 * this inode will block if they arrive while we are sleeping waiting
1067 * for old data structures to be purged or for the contents of the
1068 * disk portion of this inode to be read.
1069 */
1070 ufs_ihashins(ip);
1071
1072 if (ext2fs_inode_hash_lock < 0)
1073 wakeup(&ext2fs_inode_hash_lock);
1074 ext2fs_inode_hash_lock = 0;
1075
1076 /* Read in the disk contents for the inode, copy into the inode. */
1077#if 0
1078printf("ext2_vget(%d) dbn= %d ", ino, fsbtodb(fs, ino_to_fsba(fs, ino)));
1079#endif
1080 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
1081 (int)fs->s_blocksize, NOCRED, &bp)) != 0) {
1082 /*
1083 * The inode does not contain anything useful, so it would
1084 * be misleading to leave it on its hash chain. With mode
1085 * still zero, it will be unlinked and returned to the free
1086 * list by vput().
1087 */
1088 vput(vp);
1089 brelse(bp);
1090 *vpp = NULL;
1091 return (error);
1092 }
1093 /* convert ext2 inode to dinode */
1094 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE *
1095 ino_to_fsbo(fs, ino)), &ip->i_din);
1096 ip->i_block_group = ino_to_cg(fs, ino);
1097 ip->i_next_alloc_block = 0;
1098 ip->i_next_alloc_goal = 0;
1099 ip->i_prealloc_count = 0;
1100 ip->i_prealloc_block = 0;
1101 /* now we want to make sure that block pointers for unused
1102 blocks are zeroed out - ext2_balloc depends on this
1103 although for regular files and directories only
1104 */
1105 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
1106 used_blocks = (ip->i_size+fs->s_blocksize-1) / fs->s_blocksize;
1107 for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
1108 ip->i_db[i] = 0;
1109 }
1110/*
1111 ext2_print_inode(ip);
1112*/
1113 brelse(bp);
1114
1115 /*
1116 * Initialize the vnode from the inode, check for aliases.
1117 * Note that the underlying vnode may have changed.
1118 */
1119 if ((error = ufs_vinit(mp, ext2_specop_p, ext2_fifoop_p, &vp)) != 0) {
1120 vput(vp);
1121 *vpp = NULL;
1122 return (error);
1123 }
1124 /*
1125 * Finish inode initialization now that aliasing has been resolved.
1126 */
1127 ip->i_devvp = ump->um_devvp;
1128 VREF(ip->i_devvp);
1129 /*
1130 * Set up a generation number for this inode if it does not
1131 * already have one. This should only happen on old filesystems.
1132 */
1133 if (ip->i_gen == 0) {
1134 ip->i_gen = random() / 2 + 1;
1135 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
1136 ip->i_flag |= IN_MODIFIED;
1137 }
1138 *vpp = vp;
1139 return (0);
1140}
1141
1142/*
1143 * File handle to vnode
1144 *
1145 * Have to be really careful about stale file handles:
1146 * - check that the inode number is valid
1147 * - call ext2_vget() to get the locked inode
1148 * - check for an unallocated inode (i_mode == 0)
1149 * - check that the given client host has export rights and return
1150 * those rights via. exflagsp and credanonp
1151 */
1152static int
1153ext2_fhtovp(mp, fhp, vpp)
1154 register struct mount *mp;
1155 struct fid *fhp;
1156 struct vnode **vpp;
1157{
1158 register struct ufid *ufhp;
1159 struct ext2_sb_info *fs;
1160
1161 ufhp = (struct ufid *)fhp;
1162 fs = VFSTOUFS(mp)->um_e2fs;
1163 if (ufhp->ufid_ino < ROOTINO ||
1164 ufhp->ufid_ino > fs->s_groups_count * fs->s_es->s_inodes_per_group)
1165 return (ESTALE);
1166 return (ufs_fhtovp(mp, ufhp, vpp));
1167}
1168
1169/*
1170 * Vnode pointer to File handle
1171 */
1172/* ARGSUSED */
1173static int
1174ext2_vptofh(vp, fhp)
1175 struct vnode *vp;
1176 struct fid *fhp;
1177{
1178 register struct inode *ip;
1179 register struct ufid *ufhp;
1180
1181 ip = VTOI(vp);
1182 ufhp = (struct ufid *)fhp;
1183 ufhp->ufid_len = sizeof(struct ufid);
1184 ufhp->ufid_ino = ip->i_number;
1185 ufhp->ufid_gen = ip->i_gen;
1186 return (0);
1187}
1188
1189/*
1190 * Write a superblock and associated information back to disk.
1191 */
1192static int
1193ext2_sbupdate(mp, waitfor)
1194 struct ufsmount *mp;
1195 int waitfor;
1196{
1197 register struct ext2_sb_info *fs = mp->um_e2fs;
1198 register struct ext2_super_block *es = fs->s_es;
1199 register struct buf *bp;
1200 int error = 0;
1201/*
1202printf("\nupdating superblock, waitfor=%s\n", waitfor == MNT_WAIT ? "yes":"no");
1203*/
1204 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0);
1205 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2_super_block));
1206 if (waitfor == MNT_WAIT)
1207 error = bwrite(bp);
1208 else
1209 bawrite(bp);
1210
1211 /*
1212 * The buffers for group descriptors, inode bitmaps and block bitmaps
1213 * are not busy at this point and are (hopefully) written by the
1214 * usual sync mechanism. No need to write them here
1215 */
1216
1217 return (error);
1218}