Get rid of dead non-DragonFly code.
[dragonfly.git] / sys / vfs / gnu / ext2fs / ext2_vfsops.c
CommitLineData
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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 $
64b4604e 41 * $DragonFly: src/sys/vfs/gnu/ext2fs/ext2_vfsops.c,v 1.25 2004/12/29 02:42:14 dillon Exp $
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42 */
43
44#include "opt_quota.h"
45
46#include <sys/param.h>
47#include <sys/systm.h>
fad57d0e 48#include <sys/nlookup.h>
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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>
7b95be2a 59#include <sys/buf2.h>
984263bc 60
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61#include <vfs/ufs/quota.h>
62#include <vfs/ufs/ufsmount.h>
63#include <vfs/ufs/inode.h>
64#include <vfs/ufs/ufs_extern.h>
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65
66#include <vm/vm_zone.h>
67
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68#include "fs.h"
69#include "ext2_extern.h"
70#include "ext2_fs.h"
71#include "ext2_fs_sb.h"
984263bc 72
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73extern struct vnodeopv_entry_desc ext2_vnodeop_entries[];
74extern struct vnodeopv_entry_desc ext2_specop_entries[];
75extern struct vnodeopv_entry_desc ext2_fifoop_entries[];
76
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77static int ext2_fhtovp (struct mount *, struct fid *, struct vnode **);
78static int ext2_flushfiles (struct mount *mp, int flags, struct thread *td);
21739618 79static int ext2_mount (struct mount *, char *, caddr_t, struct thread *);
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80static int ext2_mountfs (struct vnode *, struct mount *, struct thread *);
81static int ext2_reload (struct mount *mountp, struct ucred *cred,
82 struct thread *p);
83static int ext2_sbupdate (struct ufsmount *, int);
84static int ext2_statfs (struct mount *, struct statfs *, struct thread *);
85static int ext2_sync (struct mount *, int, struct thread *);
86static int ext2_unmount (struct mount *, int, struct thread *);
87static int ext2_vget (struct mount *, ino_t, struct vnode **);
88static int ext2_vptofh (struct vnode *, struct fid *);
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89
90static MALLOC_DEFINE(M_EXT2NODE, "EXT2 node", "EXT2 vnode private part");
91
92static struct vfsops ext2fs_vfsops = {
93 ext2_mount,
94 ufs_start, /* empty function */
95 ext2_unmount,
96 ufs_root, /* root inode via vget */
97 ufs_quotactl, /* does operations associated with quotas */
98 ext2_statfs,
99 ext2_sync,
100 ext2_vget,
101 ext2_fhtovp,
102 ufs_check_export,
103 ext2_vptofh,
104 ext2_init,
105 vfs_stduninit,
106 vfs_stdextattrctl,
107};
108
109VFS_SET(ext2fs_vfsops, ext2fs, 0);
110#define bsd_malloc malloc
111#define bsd_free free
112
113static int ext2fs_inode_hash_lock;
114
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115static int ext2_check_sb_compat (struct ext2_super_block *es,
116 dev_t dev, int ronly);
117static int compute_sb_data (struct vnode * devvp,
984263bc 118 struct ext2_super_block * es,
a6ee311a 119 struct ext2_sb_info * fs);
984263bc 120
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121/*
122 * VFS Operations.
123 *
124 * mount system call
125 */
126static int
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127ext2_mount(struct mount *mp, char *path,
128 caddr_t data, /* this is actually a (struct ufs_args *) */
21739618 129 struct thread *td)
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130{
131 struct vnode *devvp;
132 struct ufs_args args;
133 struct ufsmount *ump = 0;
f7aae92f 134 struct ext2_sb_info *fs;
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135 size_t size;
136 int error, flags;
137 mode_t accessmode;
7b95be2a 138 struct ucred *cred;
fad57d0e 139 struct nlookupdata nd;
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140
141 if ((error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args))) != 0)
142 return (error);
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143
144 cred = td->td_proc->p_ucred;
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145 /*
146 * If updating, check whether changing from read-only to
147 * read/write; if there is no device name, that's all we do.
148 */
149 if (mp->mnt_flag & MNT_UPDATE) {
150 ump = VFSTOUFS(mp);
151 fs = ump->um_e2fs;
152 error = 0;
153 if (fs->s_rd_only == 0 && (mp->mnt_flag & MNT_RDONLY)) {
154 flags = WRITECLOSE;
155 if (mp->mnt_flag & MNT_FORCE)
156 flags |= FORCECLOSE;
41a01a4d 157 if (vfs_busy(mp, LK_NOWAIT, NULL, td))
984263bc 158 return (EBUSY);
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159 error = ext2_flushfiles(mp, flags, td);
160 vfs_unbusy(mp, td);
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161 if (!error && fs->s_wasvalid) {
162 fs->s_es->s_state |= EXT2_VALID_FS;
163 ext2_sbupdate(ump, MNT_WAIT);
164 }
165 fs->s_rd_only = 1;
166 }
167 if (!error && (mp->mnt_flag & MNT_RELOAD))
21739618 168 error = ext2_reload(mp, proc0.p_ucred, td);
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169 if (error)
170 return (error);
171 devvp = ump->um_devvp;
172 if (ext2_check_sb_compat(fs->s_es, devvp->v_rdev,
173 (mp->mnt_kern_flag & MNTK_WANTRDWR) == 0) != 0)
174 return (EPERM);
175 if (fs->s_rd_only && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
176 /*
177 * If upgrade to read-write by non-root, then verify
178 * that user has necessary permissions on the device.
179 */
7b95be2a 180 if (cred->cr_uid != 0) {
5fd012e0 181 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
984263bc 182 if ((error = VOP_ACCESS(devvp, VREAD | VWRITE,
7b95be2a 183 cred, td)) != 0) {
5fd012e0 184 VOP_UNLOCK(devvp, 0, td);
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185 return (error);
186 }
5fd012e0 187 VOP_UNLOCK(devvp, 0, td);
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188 }
189
190 if ((fs->s_es->s_state & EXT2_VALID_FS) == 0 ||
191 (fs->s_es->s_state & EXT2_ERROR_FS)) {
192 if (mp->mnt_flag & MNT_FORCE) {
193 printf(
194"WARNING: %s was not properly dismounted\n",
195 fs->fs_fsmnt);
196 } else {
197 printf(
198"WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
199 fs->fs_fsmnt);
200 return (EPERM);
201 }
202 }
203 fs->s_es->s_state &= ~EXT2_VALID_FS;
204 ext2_sbupdate(ump, MNT_WAIT);
205 fs->s_rd_only = 0;
206 }
207 if (args.fspec == 0) {
208 /*
209 * Process export requests.
210 */
211 return (vfs_export(mp, &ump->um_export, &args.export));
212 }
213 }
214 /*
215 * Not an update, or updating the name: look up the name
216 * and verify that it refers to a sensible block device.
217 */
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218 devvp = NULL;
219 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW);
220 if (error == 0)
221 error = nlookup(&nd);
222 if (error == 0)
223 error = cache_vref(nd.nl_ncp, nd.nl_cred, &devvp);
224 nlookup_done(&nd);
225 if (error)
984263bc 226 return (error);
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227
228 if (!vn_isdisk(devvp, &error)) {
229 vrele(devvp);
230 return (error);
231 }
232
233 /*
234 * If mount by non-root, then verify that user has necessary
235 * permissions on the device.
236 */
7b95be2a 237 if (cred->cr_uid != 0) {
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238 accessmode = VREAD;
239 if ((mp->mnt_flag & MNT_RDONLY) == 0)
240 accessmode |= VWRITE;
5fd012e0 241 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
7b95be2a 242 if ((error = VOP_ACCESS(devvp, accessmode, cred, td)) != 0) {
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243 vput(devvp);
244 return (error);
245 }
5fd012e0 246 VOP_UNLOCK(devvp, 0, td);
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247 }
248
249 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
7b95be2a 250 error = ext2_mountfs(devvp, mp, td);
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251 } else {
252 if (devvp != ump->um_devvp)
253 error = EINVAL; /* needs translation */
254 else
255 vrele(devvp);
256 }
257 if (error) {
258 vrele(devvp);
259 return (error);
260 }
261 ump = VFSTOUFS(mp);
262 fs = ump->um_e2fs;
fad57d0e 263 copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
984263bc 264 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
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265 bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
266 copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
984263bc 267 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
fad57d0e 268 ext2_statfs(mp, &mp->mnt_stat, td);
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269 return (0);
270}
271
272/*
273 * checks that the data in the descriptor blocks make sense
274 * this is taken from ext2/super.c
275 */
0f7f7a49 276static int ext2_check_descriptors(struct ext2_sb_info *sb)
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277{
278 int i;
279 int desc_block = 0;
280 unsigned long block = sb->s_es->s_first_data_block;
281 struct ext2_group_desc * gdp = NULL;
282
283 /* ext2_debug ("Checking group descriptors"); */
284
285 for (i = 0; i < sb->s_groups_count; i++)
286 {
287 /* examine next descriptor block */
288 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
289 gdp = (struct ext2_group_desc *)
290 sb->s_group_desc[desc_block++]->b_data;
291 if (gdp->bg_block_bitmap < block ||
292 gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
293 {
294 printf ("ext2_check_descriptors: "
295 "Block bitmap for group %d"
296 " not in group (block %lu)!\n",
297 i, (unsigned long) gdp->bg_block_bitmap);
298 return 0;
299 }
300 if (gdp->bg_inode_bitmap < block ||
301 gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
302 {
303 printf ("ext2_check_descriptors: "
304 "Inode bitmap for group %d"
305 " not in group (block %lu)!\n",
306 i, (unsigned long) gdp->bg_inode_bitmap);
307 return 0;
308 }
309 if (gdp->bg_inode_table < block ||
310 gdp->bg_inode_table + sb->s_itb_per_group >=
311 block + EXT2_BLOCKS_PER_GROUP(sb))
312 {
313 printf ("ext2_check_descriptors: "
314 "Inode table for group %d"
315 " not in group (block %lu)!\n",
316 i, (unsigned long) gdp->bg_inode_table);
317 return 0;
318 }
319 block += EXT2_BLOCKS_PER_GROUP(sb);
320 gdp++;
321 }
322 return 1;
323}
324
325static int
0f7f7a49 326ext2_check_sb_compat(struct ext2_super_block *es, dev_t dev, int ronly)
984263bc 327{
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328 if (es->s_magic != EXT2_SUPER_MAGIC) {
329 printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n",
330 devtoname(dev), es->s_magic, EXT2_SUPER_MAGIC);
331 return (1);
332 }
333 if (es->s_rev_level > EXT2_GOOD_OLD_REV) {
334 if (es->s_feature_incompat & ~EXT2_FEATURE_INCOMPAT_SUPP) {
335 printf(
336"WARNING: mount of %s denied due to unsupported optional features\n",
337 devtoname(dev));
338 return (1);
339 }
340 if (!ronly &&
341 (es->s_feature_ro_compat & ~EXT2_FEATURE_RO_COMPAT_SUPP)) {
342 printf(
343"WARNING: R/W mount of %s denied due to unsupported optional features\n",
344 devtoname(dev));
345 return (1);
346 }
347 }
348 return (0);
349}
350
351/*
352 * this computes the fields of the ext2_sb_info structure from the
353 * data in the ext2_super_block structure read in
354 */
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355static int
356compute_sb_data(struct vnode *devvp, struct ext2_super_block *es,
357 struct ext2_sb_info *fs)
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358{
359 int db_count, error;
360 int i, j;
361 int logic_sb_block = 1; /* XXX for now */
362
363#if 1
364#define V(v)
365#else
366#define V(v) printf(#v"= %d\n", fs->v);
367#endif
368
369 fs->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
370 V(s_blocksize)
371 fs->s_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->s_log_block_size;
372 V(s_bshift)
373 fs->s_fsbtodb = es->s_log_block_size + 1;
374 V(s_fsbtodb)
375 fs->s_qbmask = fs->s_blocksize - 1;
376 V(s_bmask)
377 fs->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(es);
378 V(s_blocksize_bits)
379 fs->s_frag_size = EXT2_MIN_FRAG_SIZE << es->s_log_frag_size;
380 V(s_frag_size)
381 if (fs->s_frag_size)
382 fs->s_frags_per_block = fs->s_blocksize / fs->s_frag_size;
383 V(s_frags_per_block)
384 fs->s_blocks_per_group = es->s_blocks_per_group;
385 V(s_blocks_per_group)
386 fs->s_frags_per_group = es->s_frags_per_group;
387 V(s_frags_per_group)
388 fs->s_inodes_per_group = es->s_inodes_per_group;
389 V(s_inodes_per_group)
390 fs->s_inodes_per_block = fs->s_blocksize / EXT2_INODE_SIZE;
391 V(s_inodes_per_block)
392 fs->s_itb_per_group = fs->s_inodes_per_group /fs->s_inodes_per_block;
393 V(s_itb_per_group)
394 fs->s_desc_per_block = fs->s_blocksize / sizeof (struct ext2_group_desc);
395 V(s_desc_per_block)
396 /* s_resuid / s_resgid ? */
397 fs->s_groups_count = (es->s_blocks_count -
398 es->s_first_data_block +
399 EXT2_BLOCKS_PER_GROUP(fs) - 1) /
400 EXT2_BLOCKS_PER_GROUP(fs);
401 V(s_groups_count)
402 db_count = (fs->s_groups_count + EXT2_DESC_PER_BLOCK(fs) - 1) /
403 EXT2_DESC_PER_BLOCK(fs);
404 fs->s_db_per_group = db_count;
405 V(s_db_per_group)
406
407 fs->s_group_desc = bsd_malloc(db_count * sizeof (struct buf *),
408 M_UFSMNT, M_WAITOK);
409
410 /* adjust logic_sb_block */
411 if(fs->s_blocksize > SBSIZE)
412 /* Godmar thinks: if the blocksize is greater than 1024, then
413 the superblock is logically part of block zero.
414 */
415 logic_sb_block = 0;
416
417 for (i = 0; i < db_count; i++) {
418 error = bread(devvp , fsbtodb(fs, logic_sb_block + i + 1),
7b95be2a 419 fs->s_blocksize, &fs->s_group_desc[i]);
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420 if(error) {
421 for (j = 0; j < i; j++)
422 brelse(fs->s_group_desc[j]);
423 bsd_free(fs->s_group_desc, M_UFSMNT);
424 printf("EXT2-fs: unable to read group descriptors (%d)\n", error);
425 return EIO;
426 }
427 /* Set the B_LOCKED flag on the buffer, then brelse() it */
428 LCK_BUF(fs->s_group_desc[i])
429 }
430 if(!ext2_check_descriptors(fs)) {
431 for (j = 0; j < db_count; j++)
432 ULCK_BUF(fs->s_group_desc[j])
433 bsd_free(fs->s_group_desc, M_UFSMNT);
434 printf("EXT2-fs: (ext2_check_descriptors failure) "
435 "unable to read group descriptors\n");
436 return EIO;
437 }
438
439 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
440 fs->s_inode_bitmap_number[i] = 0;
441 fs->s_inode_bitmap[i] = NULL;
442 fs->s_block_bitmap_number[i] = 0;
443 fs->s_block_bitmap[i] = NULL;
444 }
445 fs->s_loaded_inode_bitmaps = 0;
446 fs->s_loaded_block_bitmaps = 0;
447 return 0;
448}
449
450/*
451 * Reload all incore data for a filesystem (used after running fsck on
452 * the root filesystem and finding things to fix). The filesystem must
453 * be mounted read-only.
454 *
455 * Things to do to update the mount:
456 * 1) invalidate all cached meta-data.
457 * 2) re-read superblock from disk.
458 * 3) re-read summary information from disk.
459 * 4) invalidate all inactive vnodes.
460 * 5) invalidate all cached file data.
461 * 6) re-read inode data for all active vnodes.
462 */
41a01a4d 463static int ext2_reload_scan1(struct mount *mp, struct vnode *vp, void *rescan);
5fd012e0 464static int ext2_reload_scan2(struct mount *mp, struct vnode *vp, void *rescan);
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465
466struct scaninfo {
467 int rescan;
468 int allerror;
469 int waitfor;
470 thread_t td;
471 struct vnode *devvp;
472 struct ext2_sb_info *fs;
473};
474
984263bc 475static int
0f7f7a49 476ext2_reload(struct mount *mountp, struct ucred *cred, struct thread *td)
984263bc 477{
41a01a4d 478 struct vnode *devvp;
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479 struct buf *bp;
480 struct ext2_super_block * es;
481 struct ext2_sb_info *fs;
482 int error;
41a01a4d 483 struct scaninfo scaninfo;
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484
485 if ((mountp->mnt_flag & MNT_RDONLY) == 0)
486 return (EINVAL);
487 /*
488 * Step 1: invalidate all cached meta-data.
489 */
490 devvp = VFSTOUFS(mountp)->um_devvp;
7b95be2a 491 if (vinvalbuf(devvp, 0, td, 0, 0))
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492 panic("ext2_reload: dirty1");
493 /*
494 * Step 2: re-read superblock from disk.
495 * constants have been adjusted for ext2
496 */
7b95be2a 497 if ((error = bread(devvp, SBLOCK, SBSIZE, &bp)) != 0)
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498 return (error);
499 es = (struct ext2_super_block *)bp->b_data;
500 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
501 brelse(bp);
502 return (EIO); /* XXX needs translation */
503 }
504 fs = VFSTOUFS(mountp)->um_e2fs;
505 bcopy(bp->b_data, fs->s_es, sizeof(struct ext2_super_block));
506
507 if((error = compute_sb_data(devvp, es, fs)) != 0) {
508 brelse(bp);
509 return error;
510 }
511#ifdef UNKLAR
512 if (fs->fs_sbsize < SBSIZE)
513 bp->b_flags |= B_INVAL;
514#endif
515 brelse(bp);
516
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517 scaninfo.rescan = 1;
518 scaninfo.td = td;
519 scaninfo.devvp = devvp;
520 scaninfo.fs = fs;
521 while (error == 0 && scaninfo.rescan) {
522 scaninfo.rescan = 0;
5fd012e0 523 error = vmntvnodescan(mountp, VMSC_GETVX, ext2_reload_scan1,
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524 ext2_reload_scan2, &scaninfo);
525 }
526 return(error);
527}
528
529static int
530ext2_reload_scan1(struct mount *mp, struct vnode *vp, void *data)
531{
5fd012e0 532 /*struct scaninfo *info = data;*/
41a01a4d 533
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534 return(0);
535}
536
537static int
5fd012e0 538ext2_reload_scan2(struct mount *mp, struct vnode *vp, void *data)
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539{
540 struct scaninfo *info = data;
541 struct inode *ip;
542 struct buf *bp;
543 int error;
544
545 /*
5fd012e0 546 * Try to recycle
41a01a4d 547 */
5fd012e0 548 if (vrecycle(vp, curthread))
41a01a4d 549 return(0);
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550
551 /*
552 * Step 5: invalidate all cached file data.
553 */
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554 if (vinvalbuf(vp, 0, info->td, 0, 0))
555 panic("ext2_reload: dirty2");
556 /*
557 * Step 6: re-read inode data for all active vnodes.
558 */
559 ip = VTOI(vp);
560 error = bread(info->devvp, fsbtodb(info->fs, ino_to_fsba(info->fs, ip->i_number)),
561 (int)info->fs->s_blocksize, &bp);
5fd012e0 562 if (error)
41a01a4d 563 return (error);
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564 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data +
565 EXT2_INODE_SIZE * ino_to_fsbo(info->fs, ip->i_number)),
566 &ip->i_din);
567 brelse(bp);
41a01a4d 568 return(0);
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569}
570
571/*
572 * Common code for mount and mountroot
573 */
574static int
0f7f7a49 575ext2_mountfs(struct vnode *devvp, struct mount *mp, struct thread *td)
984263bc 576{
f7aae92f 577 struct ufsmount *ump;
984263bc 578 struct buf *bp;
f7aae92f 579 struct ext2_sb_info *fs;
984263bc 580 struct ext2_super_block * es;
e4c9c0c8 581 dev_t dev;
984263bc
MD
582 struct partinfo dpart;
583 int havepart = 0;
584 int error, i, size;
585 int ronly;
586
587 /*
588 * Disallow multiple mounts of the same device.
589 * Disallow mounting of a device that is currently in use
590 * (except for root, which might share swap device for miniroot).
591 * Flush out any old buffers remaining from a previous use.
592 */
593 if ((error = vfs_mountedon(devvp)) != 0)
594 return (error);
21739618 595 if (count_udev(devvp->v_udev) > 0)
984263bc 596 return (EBUSY);
7b95be2a 597 if ((error = vinvalbuf(devvp, V_SAVE, td, 0, 0)) != 0)
984263bc
MD
598 return (error);
599#ifdef READONLY
600/* turn on this to force it to be read-only */
601 mp->mnt_flag |= MNT_RDONLY;
602#endif
603
604 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
5fd012e0 605 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
fad57d0e 606 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL, td);
5fd012e0 607 VOP_UNLOCK(devvp, 0, td);
984263bc
MD
608 if (error)
609 return (error);
e4c9c0c8
MD
610 dev = devvp->v_rdev;
611 if (dev->si_iosize_max != 0)
612 mp->mnt_iosize_max = dev->si_iosize_max;
984263bc
MD
613 if (mp->mnt_iosize_max > MAXPHYS)
614 mp->mnt_iosize_max = MAXPHYS;
7b95be2a 615 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, td) != 0)
984263bc
MD
616 size = DEV_BSIZE;
617 else {
618 havepart = 1;
619 size = dpart.disklab->d_secsize;
620 }
621
622 bp = NULL;
623 ump = NULL;
7b95be2a 624 if ((error = bread(devvp, SBLOCK, SBSIZE, &bp)) != 0)
984263bc
MD
625 goto out;
626 es = (struct ext2_super_block *)bp->b_data;
627 if (ext2_check_sb_compat(es, dev, ronly) != 0) {
628 error = EINVAL; /* XXX needs translation */
629 goto out;
630 }
631 if ((es->s_state & EXT2_VALID_FS) == 0 ||
632 (es->s_state & EXT2_ERROR_FS)) {
633 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
634 printf(
635"WARNING: Filesystem was not properly dismounted\n");
636 } else {
637 printf(
638"WARNING: R/W mount denied. Filesystem is not clean - run fsck\n");
639 error = EPERM;
640 goto out;
641 }
642 }
643 ump = bsd_malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
644 bzero((caddr_t)ump, sizeof *ump);
645 ump->um_malloctype = M_EXT2NODE;
646 ump->um_blkatoff = ext2_blkatoff;
647 ump->um_truncate = ext2_truncate;
648 ump->um_update = ext2_update;
649 ump->um_valloc = ext2_valloc;
650 ump->um_vfree = ext2_vfree;
651 /* I don't know whether this is the right strategy. Note that
652 we dynamically allocate both a ext2_sb_info and a ext2_super_block
653 while Linux keeps the super block in a locked buffer
654 */
655 ump->um_e2fs = bsd_malloc(sizeof(struct ext2_sb_info),
656 M_UFSMNT, M_WAITOK);
657 ump->um_e2fs->s_es = bsd_malloc(sizeof(struct ext2_super_block),
658 M_UFSMNT, M_WAITOK);
659 bcopy(es, ump->um_e2fs->s_es, (u_int)sizeof(struct ext2_super_block));
660 if ((error = compute_sb_data(devvp, ump->um_e2fs->s_es, ump->um_e2fs)))
661 goto out;
662 /*
663 * We don't free the group descriptors allocated by compute_sb_data()
664 * until ext2_unmount(). This is OK since the mount will succeed.
665 */
666 brelse(bp);
667 bp = NULL;
668 fs = ump->um_e2fs;
669 fs->s_rd_only = ronly; /* ronly is set according to mnt_flags */
670 /* if the fs is not mounted read-only, make sure the super block is
671 always written back on a sync()
672 */
673 fs->s_wasvalid = fs->s_es->s_state & EXT2_VALID_FS ? 1 : 0;
674 if (ronly == 0) {
675 fs->s_dirt = 1; /* mark it modified */
676 fs->s_es->s_state &= ~EXT2_VALID_FS; /* set fs invalid */
677 }
678 mp->mnt_data = (qaddr_t)ump;
679 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
680 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
681 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
682 mp->mnt_flag |= MNT_LOCAL;
683 ump->um_mountp = mp;
684 ump->um_dev = dev;
685 ump->um_devvp = devvp;
686 /* setting those two parameters allows us to use
687 ufs_bmap w/o changse !
688 */
689 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
690 ump->um_bptrtodb = fs->s_es->s_log_block_size + 1;
691 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
692 for (i = 0; i < MAXQUOTAS; i++)
693 ump->um_quotas[i] = NULLVP;
e4c9c0c8 694 dev->si_mountpoint = mp;
0961aa92 695
6ddb7618
MD
696 vfs_add_vnodeops(mp, &mp->mnt_vn_norm_ops, ext2_vnodeop_entries);
697 vfs_add_vnodeops(mp, &mp->mnt_vn_spec_ops, ext2_specop_entries);
698 vfs_add_vnodeops(mp, &mp->mnt_vn_fifo_ops, ext2_fifoop_entries);
0961aa92 699
984263bc
MD
700 if (ronly == 0)
701 ext2_sbupdate(ump, MNT_WAIT);
702 return (0);
703out:
704 if (bp)
705 brelse(bp);
7b95be2a 706 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, td);
984263bc
MD
707 if (ump) {
708 bsd_free(ump->um_e2fs->s_es, M_UFSMNT);
709 bsd_free(ump->um_e2fs, M_UFSMNT);
710 bsd_free(ump, M_UFSMNT);
711 mp->mnt_data = (qaddr_t)0;
712 }
713 return (error);
714}
715
716/*
717 * unmount system call
718 */
719static int
0f7f7a49 720ext2_unmount(struct mount *mp, int mntflags, struct thread *td)
984263bc 721{
f7aae92f
RG
722 struct ufsmount *ump;
723 struct ext2_sb_info *fs;
984263bc
MD
724 int error, flags, ronly, i;
725
726 flags = 0;
727 if (mntflags & MNT_FORCE) {
728 if (mp->mnt_flag & MNT_ROOTFS)
729 return (EINVAL);
730 flags |= FORCECLOSE;
731 }
7b95be2a 732 if ((error = ext2_flushfiles(mp, flags, td)) != 0)
984263bc
MD
733 return (error);
734 ump = VFSTOUFS(mp);
735 fs = ump->um_e2fs;
736 ronly = fs->s_rd_only;
737 if (ronly == 0) {
738 if (fs->s_wasvalid)
739 fs->s_es->s_state |= EXT2_VALID_FS;
740 ext2_sbupdate(ump, MNT_WAIT);
741 }
742
743 /* release buffers containing group descriptors */
744 for(i = 0; i < fs->s_db_per_group; i++)
745 ULCK_BUF(fs->s_group_desc[i])
746 bsd_free(fs->s_group_desc, M_UFSMNT);
747
748 /* release cached inode/block bitmaps */
749 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
750 if (fs->s_inode_bitmap[i])
751 ULCK_BUF(fs->s_inode_bitmap[i])
752
753 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
754 if (fs->s_block_bitmap[i])
755 ULCK_BUF(fs->s_block_bitmap[i])
756
e4c9c0c8 757 ump->um_devvp->v_rdev->si_mountpoint = NULL;
7b95be2a 758 error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE, td);
984263bc
MD
759 vrele(ump->um_devvp);
760 bsd_free(fs->s_es, M_UFSMNT);
761 bsd_free(fs, M_UFSMNT);
762 bsd_free(ump, M_UFSMNT);
763 mp->mnt_data = (qaddr_t)0;
764 mp->mnt_flag &= ~MNT_LOCAL;
765 return (error);
766}
767
768/*
769 * Flush out all the files in a filesystem.
770 */
771static int
0f7f7a49 772ext2_flushfiles(struct mount *mp, int flags, struct thread *td)
984263bc 773{
f7aae92f 774 struct ufsmount *ump;
984263bc
MD
775 int error;
776#if QUOTA
777 int i;
778#endif
779
780 ump = VFSTOUFS(mp);
781#if QUOTA
782 if (mp->mnt_flag & MNT_QUOTA) {
783 if ((error = vflush(mp, 0, SKIPSYSTEM|flags)) != 0)
784 return (error);
785 for (i = 0; i < MAXQUOTAS; i++) {
786 if (ump->um_quotas[i] == NULLVP)
787 continue;
7b95be2a 788 quotaoff(td, mp, i);
984263bc
MD
789 }
790 /*
791 * Here we fall through to vflush again to ensure
792 * that we have gotten rid of all the system vnodes.
793 */
794 }
795#endif
796 error = vflush(mp, 0, flags);
797 return (error);
798}
799
800/*
801 * Get file system statistics.
802 * taken from ext2/super.c ext2_statfs
803 */
804static int
0f7f7a49 805ext2_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
984263bc
MD
806{
807 unsigned long overhead;
f7aae92f
RG
808 struct ufsmount *ump;
809 struct ext2_sb_info *fs;
810 struct ext2_super_block *es;
984263bc
MD
811 int i, nsb;
812
813 ump = VFSTOUFS(mp);
814 fs = ump->um_e2fs;
815 es = fs->s_es;
816
817 if (es->s_magic != EXT2_SUPER_MAGIC)
818 panic("ext2_statfs - magic number spoiled");
819
820 /*
821 * Compute the overhead (FS structures)
822 */
823 if (es->s_feature_ro_compat & EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER) {
824 nsb = 0;
825 for (i = 0 ; i < fs->s_groups_count; i++)
826 if (ext2_group_sparse(i))
827 nsb++;
828 } else
829 nsb = fs->s_groups_count;
830 overhead = es->s_first_data_block +
831 /* Superblocks and block group descriptors: */
832 nsb * (1 + fs->s_db_per_group) +
833 /* Inode bitmap, block bitmap, and inode table: */
834 fs->s_groups_count * (1 + 1 + fs->s_itb_per_group);
835
836 sbp->f_bsize = EXT2_FRAG_SIZE(fs);
837 sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
838 sbp->f_blocks = es->s_blocks_count - overhead;
839 sbp->f_bfree = es->s_free_blocks_count;
840 sbp->f_bavail = sbp->f_bfree - es->s_r_blocks_count;
841 sbp->f_files = es->s_inodes_count;
842 sbp->f_ffree = es->s_free_inodes_count;
843 if (sbp != &mp->mnt_stat) {
844 sbp->f_type = mp->mnt_vfc->vfc_typenum;
845 bcopy((caddr_t)mp->mnt_stat.f_mntonname,
846 (caddr_t)&sbp->f_mntonname[0], MNAMELEN);
847 bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
848 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
849 }
850 return (0);
851}
852
853/*
854 * Go through the disk queues to initiate sandbagged IO;
855 * go through the inodes to write those that have been modified;
856 * initiate the writing of the super block if it has been modified.
857 *
858 * Note: we are always called with the filesystem marked `MPBUSY'.
859 */
41a01a4d 860
5fd012e0 861static int ext2_sync_scan(struct mount *mp, struct vnode *vp, void *data);
41a01a4d 862
984263bc 863static int
0f7f7a49 864ext2_sync(struct mount *mp, int waitfor, struct thread *td)
984263bc 865{
984263bc
MD
866 struct ufsmount *ump = VFSTOUFS(mp);
867 struct ext2_sb_info *fs;
41a01a4d
MD
868 struct scaninfo scaninfo;
869 int error;
984263bc
MD
870
871 fs = ump->um_e2fs;
872 if (fs->s_dirt != 0 && fs->s_rd_only != 0) { /* XXX */
873 printf("fs = %s\n", fs->fs_fsmnt);
874 panic("ext2_sync: rofs mod");
875 }
41a01a4d 876
984263bc
MD
877 /*
878 * Write back each (modified) inode.
879 */
41a01a4d
MD
880 scaninfo.allerror = 0;
881 scaninfo.rescan = 1;
882 scaninfo.waitfor = waitfor;
883 scaninfo.td = td;
884 while (scaninfo.rescan) {
885 scaninfo.rescan = 0;
5fd012e0
MD
886 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT,
887 NULL, ext2_sync_scan, &scaninfo);
984263bc 888 }
41a01a4d 889
984263bc
MD
890 /*
891 * Force stale file system control information to be flushed.
892 */
893 if (waitfor != MNT_LAZY) {
5fd012e0 894 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, td);
7b95be2a 895 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
41a01a4d 896 scaninfo.allerror = error;
5fd012e0 897 VOP_UNLOCK(ump->um_devvp, 0, td);
984263bc
MD
898 }
899#if QUOTA
900 qsync(mp);
901#endif
902 /*
903 * Write back modified superblock.
904 */
905 if (fs->s_dirt != 0) {
906 fs->s_dirt = 0;
907 fs->s_es->s_wtime = time_second;
908 if ((error = ext2_sbupdate(ump, waitfor)) != 0)
41a01a4d
MD
909 scaninfo.allerror = error;
910 }
911 return (scaninfo.allerror);
912}
913
914static int
5fd012e0 915ext2_sync_scan(struct mount *mp, struct vnode *vp, void *data)
41a01a4d
MD
916{
917 struct scaninfo *info = data;
918 struct inode *ip;
919 int error;
920
921 ip = VTOI(vp);
922 if (vp->v_type == VNON ||
923 ((ip->i_flag &
924 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
925 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || info->waitfor == MNT_LAZY))) {
41a01a4d 926 return(0);
984263bc 927 }
41a01a4d
MD
928 if ((error = VOP_FSYNC(vp, info->waitfor, info->td)) != 0)
929 info->allerror = error;
41a01a4d 930 return(0);
984263bc
MD
931}
932
933/*
934 * Look up a EXT2FS dinode number to find its incore vnode, otherwise read it
935 * in from disk. If it is in core, wait for the lock bit to clear, then
936 * return the inode locked. Detection and handling of mount points must be
937 * done by the calling routine.
938 */
939static int
0f7f7a49 940ext2_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
984263bc 941{
f7aae92f
RG
942 struct ext2_sb_info *fs;
943 struct inode *ip;
984263bc
MD
944 struct ufsmount *ump;
945 struct buf *bp;
946 struct vnode *vp;
947 dev_t dev;
948 int i, error;
949 int used_blocks;
950
951 ump = VFSTOUFS(mp);
952 dev = ump->um_dev;
953restart:
954 if ((*vpp = ufs_ihashget(dev, ino)) != NULL)
955 return (0);
956
957 /*
958 * Lock out the creation of new entries in the FFS hash table in
959 * case getnewvnode() or MALLOC() blocks, otherwise a duplicate
960 * may occur!
961 */
962 if (ext2fs_inode_hash_lock) {
963 while (ext2fs_inode_hash_lock) {
964 ext2fs_inode_hash_lock = -1;
377d4740 965 tsleep(&ext2fs_inode_hash_lock, 0, "e2vget", 0);
984263bc
MD
966 }
967 goto restart;
968 }
969 ext2fs_inode_hash_lock = 1;
970
971 /*
972 * If this MALLOC() is performed after the getnewvnode()
973 * it might block, leaving a vnode with a NULL v_data to be
974 * found by ext2_sync() if a sync happens to fire right then,
975 * which will cause a panic because ext2_sync() blindly
976 * dereferences vp->v_data (as well it should).
977 */
978 MALLOC(ip, struct inode *, sizeof(struct inode), M_EXT2NODE, M_WAITOK);
979
980 /* Allocate a new vnode/inode. */
f0efd138 981 if ((error = getnewvnode(VT_UFS, mp, &vp, 0, LK_CANRECURSE)) != 0) {
984263bc
MD
982 if (ext2fs_inode_hash_lock < 0)
983 wakeup(&ext2fs_inode_hash_lock);
984 ext2fs_inode_hash_lock = 0;
985 *vpp = NULL;
986 FREE(ip, M_EXT2NODE);
987 return (error);
988 }
989 bzero((caddr_t)ip, sizeof(struct inode));
984263bc
MD
990 vp->v_data = ip;
991 ip->i_vnode = vp;
992 ip->i_e2fs = fs = ump->um_e2fs;
993 ip->i_dev = dev;
994 ip->i_number = ino;
995#if QUOTA
996 for (i = 0; i < MAXQUOTAS; i++)
997 ip->i_dquot[i] = NODQUOT;
998#endif
999 /*
5fd012e0
MD
1000 * Put it onto its hash chain. Since our vnode is locked, other
1001 * requests for this inode will block if they arrive while we are
1002 * sleeping waiting for old data structures to be purged or for the
1003 * contents of the disk portion of this inode to be read.
984263bc
MD
1004 */
1005 ufs_ihashins(ip);
1006
1007 if (ext2fs_inode_hash_lock < 0)
1008 wakeup(&ext2fs_inode_hash_lock);
1009 ext2fs_inode_hash_lock = 0;
1010
1011 /* Read in the disk contents for the inode, copy into the inode. */
1012#if 0
1013printf("ext2_vget(%d) dbn= %d ", ino, fsbtodb(fs, ino_to_fsba(fs, ino)));
1014#endif
1015 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
7b95be2a 1016 (int)fs->s_blocksize, &bp)) != 0) {
984263bc
MD
1017 /*
1018 * The inode does not contain anything useful, so it would
1019 * be misleading to leave it on its hash chain. With mode
1020 * still zero, it will be unlinked and returned to the free
1021 * list by vput().
1022 */
5fd012e0 1023 vx_put(vp);
984263bc
MD
1024 brelse(bp);
1025 *vpp = NULL;
1026 return (error);
1027 }
1028 /* convert ext2 inode to dinode */
1029 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE *
1030 ino_to_fsbo(fs, ino)), &ip->i_din);
1031 ip->i_block_group = ino_to_cg(fs, ino);
1032 ip->i_next_alloc_block = 0;
1033 ip->i_next_alloc_goal = 0;
1034 ip->i_prealloc_count = 0;
1035 ip->i_prealloc_block = 0;
1036 /* now we want to make sure that block pointers for unused
1037 blocks are zeroed out - ext2_balloc depends on this
1038 although for regular files and directories only
1039 */
1040 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
1041 used_blocks = (ip->i_size+fs->s_blocksize-1) / fs->s_blocksize;
1042 for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
1043 ip->i_db[i] = 0;
1044 }
1045/*
1046 ext2_print_inode(ip);
1047*/
1048 brelse(bp);
1049
1050 /*
1051 * Initialize the vnode from the inode, check for aliases.
1052 * Note that the underlying vnode may have changed.
1053 */
0961aa92 1054 if ((error = ufs_vinit(mp, &vp)) != 0) {
5fd012e0 1055 vx_put(vp);
984263bc
MD
1056 *vpp = NULL;
1057 return (error);
1058 }
1059 /*
1060 * Finish inode initialization now that aliasing has been resolved.
1061 */
1062 ip->i_devvp = ump->um_devvp;
597aea93 1063 vref(ip->i_devvp);
984263bc
MD
1064 /*
1065 * Set up a generation number for this inode if it does not
1066 * already have one. This should only happen on old filesystems.
1067 */
1068 if (ip->i_gen == 0) {
1069 ip->i_gen = random() / 2 + 1;
1070 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
1071 ip->i_flag |= IN_MODIFIED;
1072 }
5fd012e0
MD
1073 /*
1074 * Return the locked and refd vnode.
1075 */
984263bc
MD
1076 *vpp = vp;
1077 return (0);
1078}
1079
1080/*
1081 * File handle to vnode
1082 *
1083 * Have to be really careful about stale file handles:
1084 * - check that the inode number is valid
1085 * - call ext2_vget() to get the locked inode
1086 * - check for an unallocated inode (i_mode == 0)
1087 * - check that the given client host has export rights and return
1088 * those rights via. exflagsp and credanonp
1089 */
1090static int
0f7f7a49 1091ext2_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
984263bc 1092{
f7aae92f 1093 struct ufid *ufhp;
984263bc
MD
1094 struct ext2_sb_info *fs;
1095
1096 ufhp = (struct ufid *)fhp;
1097 fs = VFSTOUFS(mp)->um_e2fs;
1098 if (ufhp->ufid_ino < ROOTINO ||
1099 ufhp->ufid_ino > fs->s_groups_count * fs->s_es->s_inodes_per_group)
1100 return (ESTALE);
1101 return (ufs_fhtovp(mp, ufhp, vpp));
1102}
1103
1104/*
1105 * Vnode pointer to File handle
1106 */
1107/* ARGSUSED */
1108static int
0f7f7a49 1109ext2_vptofh(struct vnode *vp, struct fid *fhp)
984263bc 1110{
f7aae92f
RG
1111 struct inode *ip;
1112 struct ufid *ufhp;
984263bc
MD
1113
1114 ip = VTOI(vp);
1115 ufhp = (struct ufid *)fhp;
1116 ufhp->ufid_len = sizeof(struct ufid);
1117 ufhp->ufid_ino = ip->i_number;
1118 ufhp->ufid_gen = ip->i_gen;
1119 return (0);
1120}
1121
1122/*
1123 * Write a superblock and associated information back to disk.
1124 */
1125static int
0f7f7a49 1126ext2_sbupdate(struct ufsmount *mp, int waitfor)
984263bc 1127{
f7aae92f
RG
1128 struct ext2_sb_info *fs = mp->um_e2fs;
1129 struct ext2_super_block *es = fs->s_es;
1130 struct buf *bp;
984263bc
MD
1131 int error = 0;
1132/*
1133printf("\nupdating superblock, waitfor=%s\n", waitfor == MNT_WAIT ? "yes":"no");
1134*/
1135 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0);
1136 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2_super_block));
1137 if (waitfor == MNT_WAIT)
1138 error = bwrite(bp);
1139 else
1140 bawrite(bp);
1141
1142 /*
1143 * The buffers for group descriptors, inode bitmaps and block bitmaps
1144 * are not busy at this point and are (hopefully) written by the
1145 * usual sync mechanism. No need to write them here
0f7f7a49 1146 */
984263bc
MD
1147
1148 return (error);
1149}