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 */
41
42#include "opt_quota.h"
43
44#include <sys/param.h>
45#include <sys/systm.h>
46#include <sys/namei.h>
47#include <sys/proc.h>
48#include <sys/kernel.h>
49#include <sys/vnode.h>
50#include <sys/mount.h>
51#include <sys/buf.h>
52#include <sys/conf.h>
53#include <sys/fcntl.h>
54#include <sys/disklabel.h>
55#include <sys/malloc.h>
56#include <sys/stat.h>
57
58#include <miscfs/specfs/specdev.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 <gnu/ext2fs/fs.h>
66#include <gnu/ext2fs/ext2_extern.h>
67#include <gnu/ext2fs/ext2_fs.h>
68#include <gnu/ext2fs/ext2_fs_sb.h>
69
70static int ext2_fhtovp __P((struct mount *, struct fid *, struct sockaddr *,
71 struct vnode **, int *, struct ucred **));
72static int ext2_flushfiles __P((struct mount *mp, int flags, struct proc *p));
73static int ext2_mount __P((struct mount *,
74 char *, caddr_t, struct nameidata *, struct proc *));
75static int ext2_mountfs __P((struct vnode *, struct mount *, struct proc *));
76static int ext2_reload __P((struct mount *mountp, struct ucred *cred,
77 struct proc *p));
78static int ext2_sbupdate __P((struct ufsmount *, int));
79static int ext2_statfs __P((struct mount *, struct statfs *, struct proc *));
80static int ext2_sync __P((struct mount *, int, struct ucred *, struct proc *));
81static int ext2_unmount __P((struct mount *, int, struct proc *));
82static int ext2_vget __P((struct mount *, ino_t, struct vnode **));
83static int ext2_vptofh __P((struct vnode *, struct fid *));
84
85static MALLOC_DEFINE(M_EXT2NODE, "EXT2 node", "EXT2 vnode private part");
86
87static struct vfsops ext2fs_vfsops = {
88 ext2_mount,
89 ufs_start, /* empty function */
90 ext2_unmount,
91 ufs_root, /* root inode via vget */
92 ufs_quotactl, /* does operations associated with quotas */
93 ext2_statfs,
94 ext2_sync,
95 ext2_vget,
96 ext2_fhtovp,
97 ext2_vptofh,
98 ext2_init,
99};
100
| 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 */
41
42#include "opt_quota.h"
43
44#include <sys/param.h>
45#include <sys/systm.h>
46#include <sys/namei.h>
47#include <sys/proc.h>
48#include <sys/kernel.h>
49#include <sys/vnode.h>
50#include <sys/mount.h>
51#include <sys/buf.h>
52#include <sys/conf.h>
53#include <sys/fcntl.h>
54#include <sys/disklabel.h>
55#include <sys/malloc.h>
56#include <sys/stat.h>
57
58#include <miscfs/specfs/specdev.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 <gnu/ext2fs/fs.h>
66#include <gnu/ext2fs/ext2_extern.h>
67#include <gnu/ext2fs/ext2_fs.h>
68#include <gnu/ext2fs/ext2_fs_sb.h>
69
70static int ext2_fhtovp __P((struct mount *, struct fid *, struct sockaddr *,
71 struct vnode **, int *, struct ucred **));
72static int ext2_flushfiles __P((struct mount *mp, int flags, struct proc *p));
73static int ext2_mount __P((struct mount *,
74 char *, caddr_t, struct nameidata *, struct proc *));
75static int ext2_mountfs __P((struct vnode *, struct mount *, struct proc *));
76static int ext2_reload __P((struct mount *mountp, struct ucred *cred,
77 struct proc *p));
78static int ext2_sbupdate __P((struct ufsmount *, int));
79static int ext2_statfs __P((struct mount *, struct statfs *, struct proc *));
80static int ext2_sync __P((struct mount *, int, struct ucred *, struct proc *));
81static int ext2_unmount __P((struct mount *, int, struct proc *));
82static int ext2_vget __P((struct mount *, ino_t, struct vnode **));
83static int ext2_vptofh __P((struct vnode *, struct fid *));
84
85static MALLOC_DEFINE(M_EXT2NODE, "EXT2 node", "EXT2 vnode private part");
86
87static struct vfsops ext2fs_vfsops = {
88 ext2_mount,
89 ufs_start, /* empty function */
90 ext2_unmount,
91 ufs_root, /* root inode via vget */
92 ufs_quotactl, /* does operations associated with quotas */
93 ext2_statfs,
94 ext2_sync,
95 ext2_vget,
96 ext2_fhtovp,
97 ext2_vptofh,
98 ext2_init,
99};
100
|
101VFS_SET(ext2fs_vfsops, ext2fs, MOUNT_EXT2FS, 0);
| 101VFS_SET(ext2fs_vfsops, ext2fs, 0);
|
102#define bsd_malloc malloc
103#define bsd_free free
104
105static int ext2fs_inode_hash_lock;
106
107static int compute_sb_data __P((struct vnode * devvp,
108 struct ext2_super_block * es,
109 struct ext2_sb_info * fs));
110
111#ifdef notyet
112static int ext2_mountroot __P((void));
113
114/*
115 * Called by main() when ext2fs is going to be mounted as root.
116 *
117 * Name is updated by mount(8) after booting.
118 */
119#define ROOTNAME "root_device"
120
121static int
122ext2_mountroot()
123{
124 register struct ext2_sb_info *fs;
125 register struct mount *mp;
126 struct proc *p = curproc;
127 struct ufsmount *ump;
128 u_int size;
129 int error;
130
131 if ((error = bdevvp(rootdev, &rootvp))) {
132 printf("ext2_mountroot: can't find rootvp");
133 return (error);
134 }
135 mp = bsd_malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
136 bzero((char *)mp, (u_long)sizeof(struct mount));
137 mp->mnt_op = &ext2fs_vfsops;
138 mp->mnt_flag = MNT_RDONLY;
139 if (bdevsw[major(rootdev)]->d_flags & D_NOCLUSTERR)
140 mp->mnt_flag |= MNT_NOCLUSTERR;
141 if (bdevsw[major(rootdev)]->d_flags & D_NOCLUSTERW)
142 mp->mnt_flag |= MNT_NOCLUSTERW;
143 if (error = ext2_mountfs(rootvp, mp, p)) {
144 bsd_free(mp, M_MOUNT);
145 return (error);
146 }
147 if (error = vfs_lock(mp)) {
148 (void)ext2_unmount(mp, 0, p);
149 bsd_free(mp, M_MOUNT);
150 return (error);
151 }
152 CIRCLEQ_INSERT_HEAD(&mountlist, mp, mnt_list);
153 mp->mnt_flag |= MNT_ROOTFS;
154 mp->mnt_vnodecovered = NULLVP;
155 ump = VFSTOUFS(mp);
156 fs = ump->um_e2fs;
157 bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt));
158 fs->fs_fsmnt[0] = '/';
159 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
160 MNAMELEN);
161 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
162 &size);
163 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
164 (void)ext2_statfs(mp, &mp->mnt_stat, p);
165 vfs_unlock(mp);
166 inittodr(fs->s_es->s_wtime); /* this helps to set the time */
167 return (0);
168}
169#endif
170
171/*
172 * VFS Operations.
173 *
174 * mount system call
175 */
176static int
177ext2_mount(mp, path, data, ndp, p)
178 register struct mount *mp;
179 char *path;
180 caddr_t data; /* this is actually a (struct ufs_args *) */
181 struct nameidata *ndp;
182 struct proc *p;
183{
184 struct vnode *devvp;
185 struct ufs_args args;
186 struct ufsmount *ump = 0;
187 register struct ext2_sb_info *fs;
188 u_int size;
189 int error, flags;
190
191 if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)))
192 return (error);
193 /*
194 * If updating, check whether changing from read-only to
195 * read/write; if there is no device name, that's all we do.
196 * Disallow clearing MNT_NOCLUSTERR and MNT_NOCLUSTERW flags,
197 * if block device requests.
198 */
199 if (mp->mnt_flag & MNT_UPDATE) {
200 ump = VFSTOUFS(mp);
201 fs = ump->um_e2fs;
202 error = 0;
203 if (bdevsw[major(ump->um_dev)]->d_flags & D_NOCLUSTERR)
204 mp->mnt_flag |= MNT_NOCLUSTERR;
205 if (bdevsw[major(ump->um_dev)]->d_flags & D_NOCLUSTERW)
206 mp->mnt_flag |= MNT_NOCLUSTERW;
207 if (fs->s_rd_only == 0 && (mp->mnt_flag & MNT_RDONLY)) {
208 flags = WRITECLOSE;
209 if (mp->mnt_flag & MNT_FORCE)
210 flags |= FORCECLOSE;
211 if (vfs_busy(mp, LK_NOWAIT, 0, p))
212 return (EBUSY);
213 error = ext2_flushfiles(mp, flags, p);
214 vfs_unbusy(mp, p);
215 }
216 if (!error && (mp->mnt_flag & MNT_RELOAD))
217 error = ext2_reload(mp, ndp->ni_cnd.cn_cred, p);
218 if (error)
219 return (error);
220 if (fs->s_rd_only && (mp->mnt_kern_flag & MNTK_WANTRDWR))
221 fs->s_rd_only = 0;
222 if (fs->s_rd_only == 0) {
223 /* don't say it's clean */
224 fs->s_es->s_state &= ~EXT2_VALID_FS;
225 ext2_sbupdate(ump, MNT_WAIT);
226 }
227 if (args.fspec == 0) {
228 /*
229 * Process export requests.
230 */
231 return (vfs_export(mp, &ump->um_export, &args.export));
232 }
233 }
234 /*
235 * Not an update, or updating the name: look up the name
236 * and verify that it refers to a sensible block device.
237 */
238 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
239 if (error = namei(ndp))
240 return (error);
241 devvp = ndp->ni_vp;
242
243 if (devvp->v_type != VBLK) {
244 vrele(devvp);
245 return (ENOTBLK);
246 }
247 if (major(devvp->v_rdev) >= nblkdev) {
248 vrele(devvp);
249 return (ENXIO);
250 }
251 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
252 if (bdevsw[major(devvp->v_rdev)]->d_flags & D_NOCLUSTERR)
253 mp->mnt_flag |= MNT_NOCLUSTERR;
254 if (bdevsw[major(devvp->v_rdev)]->d_flags & D_NOCLUSTERW)
255 mp->mnt_flag |= MNT_NOCLUSTERW;
256 error = ext2_mountfs(devvp, mp, p);
257 } else {
258 if (devvp != ump->um_devvp)
259 error = EINVAL; /* needs translation */
260 else
261 vrele(devvp);
262 }
263 if (error) {
264 vrele(devvp);
265 return (error);
266 }
267 ump = VFSTOUFS(mp);
268 fs = ump->um_e2fs;
269 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
270 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
271 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
272 MNAMELEN);
273 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
274 &size);
275 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
276 (void)ext2_statfs(mp, &mp->mnt_stat, p);
277 return (0);
278}
279
280/*
281 * checks that the data in the descriptor blocks make sense
282 * this is taken from ext2/super.c
283 */
284static int ext2_check_descriptors (struct ext2_sb_info * sb)
285{
286 int i;
287 int desc_block = 0;
288 unsigned long block = sb->s_es->s_first_data_block;
289 struct ext2_group_desc * gdp = NULL;
290
291 /* ext2_debug ("Checking group descriptors"); */
292
293 for (i = 0; i < sb->s_groups_count; i++)
294 {
295 /* examine next descriptor block */
296 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
297 gdp = (struct ext2_group_desc *)
298 sb->s_group_desc[desc_block++]->b_data;
299 if (gdp->bg_block_bitmap < block ||
300 gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
301 {
302 printf ("ext2_check_descriptors: "
303 "Block bitmap for group %d"
304 " not in group (block %lu)!",
305 i, (unsigned long) gdp->bg_block_bitmap);
306 return 0;
307 }
308 if (gdp->bg_inode_bitmap < block ||
309 gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
310 {
311 printf ("ext2_check_descriptors: "
312 "Inode bitmap for group %d"
313 " not in group (block %lu)!",
314 i, (unsigned long) gdp->bg_inode_bitmap);
315 return 0;
316 }
317 if (gdp->bg_inode_table < block ||
318 gdp->bg_inode_table + sb->s_itb_per_group >=
319 block + EXT2_BLOCKS_PER_GROUP(sb))
320 {
321 printf ("ext2_check_descriptors: "
322 "Inode table for group %d"
323 " not in group (block %lu)!",
324 i, (unsigned long) gdp->bg_inode_table);
325 return 0;
326 }
327 block += EXT2_BLOCKS_PER_GROUP(sb);
328 gdp++;
329 }
330 return 1;
331}
332
333/*
334 * this computes the fields of the ext2_sb_info structure from the
335 * data in the ext2_super_block structure read in
336 */
337static int compute_sb_data(devvp, es, fs)
338 struct vnode * devvp;
339 struct ext2_super_block * es;
340 struct ext2_sb_info * fs;
341{
342 int db_count, error;
343 int i, j;
344 int logic_sb_block = 1; /* XXX for now */
345
346#if 1
347#define V(v)
348#else
349#define V(v) printf(#v"= %d\n", fs->v);
350#endif
351
352 fs->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
353 V(s_blocksize)
354 fs->s_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->s_log_block_size;
355 V(s_bshift)
356 fs->s_fsbtodb = es->s_log_block_size + 1;
357 V(s_fsbtodb)
358 fs->s_qbmask = fs->s_blocksize - 1;
359 V(s_bmask)
360 fs->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(es);
361 V(s_blocksize_bits)
362 fs->s_frag_size = EXT2_MIN_FRAG_SIZE << es->s_log_frag_size;
363 V(s_frag_size)
364 if (fs->s_frag_size)
365 fs->s_frags_per_block = fs->s_blocksize / fs->s_frag_size;
366 V(s_frags_per_block)
367 fs->s_blocks_per_group = es->s_blocks_per_group;
368 V(s_blocks_per_group)
369 fs->s_frags_per_group = es->s_frags_per_group;
370 V(s_frags_per_group)
371 fs->s_inodes_per_group = es->s_inodes_per_group;
372 V(s_inodes_per_group)
373 fs->s_inodes_per_block = fs->s_blocksize / EXT2_INODE_SIZE;
374 V(s_inodes_per_block)
375 fs->s_itb_per_group = fs->s_inodes_per_group /fs->s_inodes_per_block;
376 V(s_itb_per_group)
377 fs->s_desc_per_block = fs->s_blocksize / sizeof (struct ext2_group_desc);
378 V(s_desc_per_block)
379 /* s_resuid / s_resgid ? */
380 fs->s_groups_count = (es->s_blocks_count -
381 es->s_first_data_block +
382 EXT2_BLOCKS_PER_GROUP(fs) - 1) /
383 EXT2_BLOCKS_PER_GROUP(fs);
384 V(s_groups_count)
385 db_count = (fs->s_groups_count + EXT2_DESC_PER_BLOCK(fs) - 1) /
386 EXT2_DESC_PER_BLOCK(fs);
387 fs->s_db_per_group = db_count;
388 V(s_db_per_group)
389
390 fs->s_group_desc = bsd_malloc(db_count * sizeof (struct buf *),
391 M_UFSMNT, M_WAITOK);
392
393 /* adjust logic_sb_block */
394 if(fs->s_blocksize > SBSIZE)
395 /* Godmar thinks: if the blocksize is greater than 1024, then
396 the superblock is logically part of block zero.
397 */
398 logic_sb_block = 0;
399
400 for (i = 0; i < db_count; i++) {
401 error = bread(devvp , fsbtodb(fs, logic_sb_block + i + 1),
402 fs->s_blocksize, NOCRED, &fs->s_group_desc[i]);
403 if(error) {
404 for (j = 0; j < i; j++)
405 brelse(fs->s_group_desc[j]);
406 bsd_free(fs->s_group_desc, M_UFSMNT);
407 printf("EXT2-fs: unable to read group descriptors (%d)\n", error);
408 return EIO;
409 }
410 /* Set the B_LOCKED flag on the buffer, then brelse() it */
411 LCK_BUF(fs->s_group_desc[i])
412 }
413 if(!ext2_check_descriptors(fs)) {
414 for (j = 0; j < db_count; j++)
415 ULCK_BUF(fs->s_group_desc[j])
416 bsd_free(fs->s_group_desc, M_UFSMNT);
417 printf("EXT2-fs: (ext2_check_descriptors failure) "
418 "unable to read group descriptors\n");
419 return EIO;
420 }
421
422 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
423 fs->s_inode_bitmap_number[i] = 0;
424 fs->s_inode_bitmap[i] = NULL;
425 fs->s_block_bitmap_number[i] = 0;
426 fs->s_block_bitmap[i] = NULL;
427 }
428 fs->s_loaded_inode_bitmaps = 0;
429 fs->s_loaded_block_bitmaps = 0;
430 return 0;
431}
432
433/*
434 * Reload all incore data for a filesystem (used after running fsck on
435 * the root filesystem and finding things to fix). The filesystem must
436 * be mounted read-only.
437 *
438 * Things to do to update the mount:
439 * 1) invalidate all cached meta-data.
440 * 2) re-read superblock from disk.
441 * 3) re-read summary information from disk.
442 * 4) invalidate all inactive vnodes.
443 * 5) invalidate all cached file data.
444 * 6) re-read inode data for all active vnodes.
445 */
446static int
447ext2_reload(mountp, cred, p)
448 register struct mount *mountp;
449 struct ucred *cred;
450 struct proc *p;
451{
452 register struct vnode *vp, *nvp, *devvp;
453 struct inode *ip;
454 struct buf *bp;
455 struct ext2_super_block * es;
456 struct ext2_sb_info *fs;
457 int error;
458
459 if ((mountp->mnt_flag & MNT_RDONLY) == 0)
460 return (EINVAL);
461 /*
462 * Step 1: invalidate all cached meta-data.
463 */
464 devvp = VFSTOUFS(mountp)->um_devvp;
465 if (vinvalbuf(devvp, 0, cred, p, 0, 0))
466 panic("ext2_reload: dirty1");
467 /*
468 * Step 2: re-read superblock from disk.
469 * constants have been adjusted for ext2
470 */
471 if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp))
472 return (error);
473 es = (struct ext2_super_block *)bp->b_data;
474 if (es->s_magic != EXT2_SUPER_MAGIC) {
475 if(es->s_magic == EXT2_PRE_02B_MAGIC)
476 printf("This filesystem bears the magic number of a pre "
477 "0.2b version of ext2. This is not supported by "
478 "Lites.\n");
479 else
480 printf("Wrong magic number: %x (expected %x for ext2 fs\n",
481 es->s_magic, EXT2_SUPER_MAGIC);
482 brelse(bp);
483 return (EIO); /* XXX needs translation */
484 }
485 fs = VFSTOUFS(mountp)->um_e2fs;
486 bcopy(bp->b_data, fs->s_es, sizeof(struct ext2_super_block));
487
488 if(error = compute_sb_data(devvp, es, fs)) {
489 brelse(bp);
490 return error;
491 }
492#ifdef UNKLAR
493 if (fs->fs_sbsize < SBSIZE)
494 bp->b_flags |= B_INVAL;
495#endif
496 brelse(bp);
497
498loop:
499 for (vp = mountp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) {
500 nvp = vp->v_mntvnodes.le_next;
501 /*
502 * Step 4: invalidate all inactive vnodes.
503 */
504 if (vp->v_usecount == 0) {
505 vgone(vp);
506 continue;
507 }
508 /*
509 * Step 5: invalidate all cached file data.
510 */
511 if (vget(vp, LK_EXCLUSIVE, p))
512 goto loop;
513 if (vinvalbuf(vp, 0, cred, p, 0, 0))
514 panic("ext2_reload: dirty2");
515 /*
516 * Step 6: re-read inode data for all active vnodes.
517 */
518 ip = VTOI(vp);
519 if (error =
520 bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
521 (int)fs->s_blocksize, NOCRED, &bp)) {
522 vput(vp);
523 return (error);
524 }
525 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data +
526 EXT2_INODE_SIZE * ino_to_fsbo(fs, ip->i_number)),
527 &ip->i_din);
528 brelse(bp);
529 vput(vp);
530 if (vp->v_mount != mountp)
531 goto loop;
532 }
533 return (0);
534}
535
536/*
537 * Common code for mount and mountroot
538 */
539static int
540ext2_mountfs(devvp, mp, p)
541 register struct vnode *devvp;
542 struct mount *mp;
543 struct proc *p;
544{
545 register struct ufsmount *ump;
546 struct buf *bp;
547 register struct ext2_sb_info *fs;
548 struct ext2_super_block * es;
549 dev_t dev = devvp->v_rdev;
550 struct partinfo dpart;
551 int havepart = 0;
552 int error, i, size;
553 int ronly;
554
555 /*
556 * Disallow multiple mounts of the same device.
557 * Disallow mounting of a device that is currently in use
558 * (except for root, which might share swap device for miniroot).
559 * Flush out any old buffers remaining from a previous use.
560 */
561 if (error = vfs_mountedon(devvp))
562 return (error);
563 if (vcount(devvp) > 1 && devvp != rootvp)
564 return (EBUSY);
565 if (error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0))
566 return (error);
567#ifdef READONLY
568/* turn on this to force it to be read-only */
569 mp->mnt_flag |= MNT_RDONLY;
570#endif
571
572 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
573 if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p))
574 return (error);
575 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0)
576 size = DEV_BSIZE;
577 else {
578 havepart = 1;
579 size = dpart.disklab->d_secsize;
580 }
581
582 bp = NULL;
583 ump = NULL;
584 if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp))
585 goto out;
586 es = (struct ext2_super_block *)bp->b_data;
587 if (es->s_magic != EXT2_SUPER_MAGIC) {
588 if(es->s_magic == EXT2_PRE_02B_MAGIC)
589 printf("This filesystem bears the magic number of a pre "
590 "0.2b version of ext2. This is not supported by "
591 "Lites.\n");
592 else
593 printf("Wrong magic number: %x (expected %x for EXT2FS)\n",
594 es->s_magic, EXT2_SUPER_MAGIC);
595 error = EINVAL; /* XXX needs translation */
596 goto out;
597 }
598 ump = bsd_malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
599 bzero((caddr_t)ump, sizeof *ump);
600 ump->um_malloctype = M_EXT2NODE;
601 ump->um_blkatoff = ext2_blkatoff;
602 ump->um_truncate = ext2_truncate;
603 ump->um_update = ext2_update;
604 ump->um_valloc = ext2_valloc;
605 ump->um_vfree = ext2_vfree;
606 /* I don't know whether this is the right strategy. Note that
607 we dynamically allocate both a ext2_sb_info and a ext2_super_block
608 while Linux keeps the super block in a locked buffer
609 */
610 ump->um_e2fs = bsd_malloc(sizeof(struct ext2_sb_info),
611 M_UFSMNT, M_WAITOK);
612 ump->um_e2fs->s_es = bsd_malloc(sizeof(struct ext2_super_block),
613 M_UFSMNT, M_WAITOK);
614 bcopy(es, ump->um_e2fs->s_es, (u_int)sizeof(struct ext2_super_block));
615 if(error = compute_sb_data(devvp, ump->um_e2fs->s_es, ump->um_e2fs)) {
616 brelse(bp);
617 return error;
618 }
619 brelse(bp);
620 bp = NULL;
621 fs = ump->um_e2fs;
622 fs->s_rd_only = ronly; /* ronly is set according to mnt_flags */
623 if (!(fs->s_es->s_state & EXT2_VALID_FS)) {
624 printf("WARNING: %s was not properly dismounted\n",
625 fs->fs_fsmnt);
626 }
627 /* if the fs is not mounted read-only, make sure the super block is
628 always written back on a sync()
629 */
630 if (ronly == 0) {
631 fs->s_dirt = 1; /* mark it modified */
632 fs->s_es->s_state &= ~EXT2_VALID_FS; /* set fs invalid */
633 }
634 mp->mnt_data = (qaddr_t)ump;
635 mp->mnt_stat.f_fsid.val[0] = (long)dev;
| 102#define bsd_malloc malloc
103#define bsd_free free
104
105static int ext2fs_inode_hash_lock;
106
107static int compute_sb_data __P((struct vnode * devvp,
108 struct ext2_super_block * es,
109 struct ext2_sb_info * fs));
110
111#ifdef notyet
112static int ext2_mountroot __P((void));
113
114/*
115 * Called by main() when ext2fs is going to be mounted as root.
116 *
117 * Name is updated by mount(8) after booting.
118 */
119#define ROOTNAME "root_device"
120
121static int
122ext2_mountroot()
123{
124 register struct ext2_sb_info *fs;
125 register struct mount *mp;
126 struct proc *p = curproc;
127 struct ufsmount *ump;
128 u_int size;
129 int error;
130
131 if ((error = bdevvp(rootdev, &rootvp))) {
132 printf("ext2_mountroot: can't find rootvp");
133 return (error);
134 }
135 mp = bsd_malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
136 bzero((char *)mp, (u_long)sizeof(struct mount));
137 mp->mnt_op = &ext2fs_vfsops;
138 mp->mnt_flag = MNT_RDONLY;
139 if (bdevsw[major(rootdev)]->d_flags & D_NOCLUSTERR)
140 mp->mnt_flag |= MNT_NOCLUSTERR;
141 if (bdevsw[major(rootdev)]->d_flags & D_NOCLUSTERW)
142 mp->mnt_flag |= MNT_NOCLUSTERW;
143 if (error = ext2_mountfs(rootvp, mp, p)) {
144 bsd_free(mp, M_MOUNT);
145 return (error);
146 }
147 if (error = vfs_lock(mp)) {
148 (void)ext2_unmount(mp, 0, p);
149 bsd_free(mp, M_MOUNT);
150 return (error);
151 }
152 CIRCLEQ_INSERT_HEAD(&mountlist, mp, mnt_list);
153 mp->mnt_flag |= MNT_ROOTFS;
154 mp->mnt_vnodecovered = NULLVP;
155 ump = VFSTOUFS(mp);
156 fs = ump->um_e2fs;
157 bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt));
158 fs->fs_fsmnt[0] = '/';
159 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
160 MNAMELEN);
161 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
162 &size);
163 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
164 (void)ext2_statfs(mp, &mp->mnt_stat, p);
165 vfs_unlock(mp);
166 inittodr(fs->s_es->s_wtime); /* this helps to set the time */
167 return (0);
168}
169#endif
170
171/*
172 * VFS Operations.
173 *
174 * mount system call
175 */
176static int
177ext2_mount(mp, path, data, ndp, p)
178 register struct mount *mp;
179 char *path;
180 caddr_t data; /* this is actually a (struct ufs_args *) */
181 struct nameidata *ndp;
182 struct proc *p;
183{
184 struct vnode *devvp;
185 struct ufs_args args;
186 struct ufsmount *ump = 0;
187 register struct ext2_sb_info *fs;
188 u_int size;
189 int error, flags;
190
191 if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)))
192 return (error);
193 /*
194 * If updating, check whether changing from read-only to
195 * read/write; if there is no device name, that's all we do.
196 * Disallow clearing MNT_NOCLUSTERR and MNT_NOCLUSTERW flags,
197 * if block device requests.
198 */
199 if (mp->mnt_flag & MNT_UPDATE) {
200 ump = VFSTOUFS(mp);
201 fs = ump->um_e2fs;
202 error = 0;
203 if (bdevsw[major(ump->um_dev)]->d_flags & D_NOCLUSTERR)
204 mp->mnt_flag |= MNT_NOCLUSTERR;
205 if (bdevsw[major(ump->um_dev)]->d_flags & D_NOCLUSTERW)
206 mp->mnt_flag |= MNT_NOCLUSTERW;
207 if (fs->s_rd_only == 0 && (mp->mnt_flag & MNT_RDONLY)) {
208 flags = WRITECLOSE;
209 if (mp->mnt_flag & MNT_FORCE)
210 flags |= FORCECLOSE;
211 if (vfs_busy(mp, LK_NOWAIT, 0, p))
212 return (EBUSY);
213 error = ext2_flushfiles(mp, flags, p);
214 vfs_unbusy(mp, p);
215 }
216 if (!error && (mp->mnt_flag & MNT_RELOAD))
217 error = ext2_reload(mp, ndp->ni_cnd.cn_cred, p);
218 if (error)
219 return (error);
220 if (fs->s_rd_only && (mp->mnt_kern_flag & MNTK_WANTRDWR))
221 fs->s_rd_only = 0;
222 if (fs->s_rd_only == 0) {
223 /* don't say it's clean */
224 fs->s_es->s_state &= ~EXT2_VALID_FS;
225 ext2_sbupdate(ump, MNT_WAIT);
226 }
227 if (args.fspec == 0) {
228 /*
229 * Process export requests.
230 */
231 return (vfs_export(mp, &ump->um_export, &args.export));
232 }
233 }
234 /*
235 * Not an update, or updating the name: look up the name
236 * and verify that it refers to a sensible block device.
237 */
238 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
239 if (error = namei(ndp))
240 return (error);
241 devvp = ndp->ni_vp;
242
243 if (devvp->v_type != VBLK) {
244 vrele(devvp);
245 return (ENOTBLK);
246 }
247 if (major(devvp->v_rdev) >= nblkdev) {
248 vrele(devvp);
249 return (ENXIO);
250 }
251 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
252 if (bdevsw[major(devvp->v_rdev)]->d_flags & D_NOCLUSTERR)
253 mp->mnt_flag |= MNT_NOCLUSTERR;
254 if (bdevsw[major(devvp->v_rdev)]->d_flags & D_NOCLUSTERW)
255 mp->mnt_flag |= MNT_NOCLUSTERW;
256 error = ext2_mountfs(devvp, mp, p);
257 } else {
258 if (devvp != ump->um_devvp)
259 error = EINVAL; /* needs translation */
260 else
261 vrele(devvp);
262 }
263 if (error) {
264 vrele(devvp);
265 return (error);
266 }
267 ump = VFSTOUFS(mp);
268 fs = ump->um_e2fs;
269 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
270 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
271 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
272 MNAMELEN);
273 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
274 &size);
275 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
276 (void)ext2_statfs(mp, &mp->mnt_stat, p);
277 return (0);
278}
279
280/*
281 * checks that the data in the descriptor blocks make sense
282 * this is taken from ext2/super.c
283 */
284static int ext2_check_descriptors (struct ext2_sb_info * sb)
285{
286 int i;
287 int desc_block = 0;
288 unsigned long block = sb->s_es->s_first_data_block;
289 struct ext2_group_desc * gdp = NULL;
290
291 /* ext2_debug ("Checking group descriptors"); */
292
293 for (i = 0; i < sb->s_groups_count; i++)
294 {
295 /* examine next descriptor block */
296 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
297 gdp = (struct ext2_group_desc *)
298 sb->s_group_desc[desc_block++]->b_data;
299 if (gdp->bg_block_bitmap < block ||
300 gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
301 {
302 printf ("ext2_check_descriptors: "
303 "Block bitmap for group %d"
304 " not in group (block %lu)!",
305 i, (unsigned long) gdp->bg_block_bitmap);
306 return 0;
307 }
308 if (gdp->bg_inode_bitmap < block ||
309 gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
310 {
311 printf ("ext2_check_descriptors: "
312 "Inode bitmap for group %d"
313 " not in group (block %lu)!",
314 i, (unsigned long) gdp->bg_inode_bitmap);
315 return 0;
316 }
317 if (gdp->bg_inode_table < block ||
318 gdp->bg_inode_table + sb->s_itb_per_group >=
319 block + EXT2_BLOCKS_PER_GROUP(sb))
320 {
321 printf ("ext2_check_descriptors: "
322 "Inode table for group %d"
323 " not in group (block %lu)!",
324 i, (unsigned long) gdp->bg_inode_table);
325 return 0;
326 }
327 block += EXT2_BLOCKS_PER_GROUP(sb);
328 gdp++;
329 }
330 return 1;
331}
332
333/*
334 * this computes the fields of the ext2_sb_info structure from the
335 * data in the ext2_super_block structure read in
336 */
337static int compute_sb_data(devvp, es, fs)
338 struct vnode * devvp;
339 struct ext2_super_block * es;
340 struct ext2_sb_info * fs;
341{
342 int db_count, error;
343 int i, j;
344 int logic_sb_block = 1; /* XXX for now */
345
346#if 1
347#define V(v)
348#else
349#define V(v) printf(#v"= %d\n", fs->v);
350#endif
351
352 fs->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
353 V(s_blocksize)
354 fs->s_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->s_log_block_size;
355 V(s_bshift)
356 fs->s_fsbtodb = es->s_log_block_size + 1;
357 V(s_fsbtodb)
358 fs->s_qbmask = fs->s_blocksize - 1;
359 V(s_bmask)
360 fs->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(es);
361 V(s_blocksize_bits)
362 fs->s_frag_size = EXT2_MIN_FRAG_SIZE << es->s_log_frag_size;
363 V(s_frag_size)
364 if (fs->s_frag_size)
365 fs->s_frags_per_block = fs->s_blocksize / fs->s_frag_size;
366 V(s_frags_per_block)
367 fs->s_blocks_per_group = es->s_blocks_per_group;
368 V(s_blocks_per_group)
369 fs->s_frags_per_group = es->s_frags_per_group;
370 V(s_frags_per_group)
371 fs->s_inodes_per_group = es->s_inodes_per_group;
372 V(s_inodes_per_group)
373 fs->s_inodes_per_block = fs->s_blocksize / EXT2_INODE_SIZE;
374 V(s_inodes_per_block)
375 fs->s_itb_per_group = fs->s_inodes_per_group /fs->s_inodes_per_block;
376 V(s_itb_per_group)
377 fs->s_desc_per_block = fs->s_blocksize / sizeof (struct ext2_group_desc);
378 V(s_desc_per_block)
379 /* s_resuid / s_resgid ? */
380 fs->s_groups_count = (es->s_blocks_count -
381 es->s_first_data_block +
382 EXT2_BLOCKS_PER_GROUP(fs) - 1) /
383 EXT2_BLOCKS_PER_GROUP(fs);
384 V(s_groups_count)
385 db_count = (fs->s_groups_count + EXT2_DESC_PER_BLOCK(fs) - 1) /
386 EXT2_DESC_PER_BLOCK(fs);
387 fs->s_db_per_group = db_count;
388 V(s_db_per_group)
389
390 fs->s_group_desc = bsd_malloc(db_count * sizeof (struct buf *),
391 M_UFSMNT, M_WAITOK);
392
393 /* adjust logic_sb_block */
394 if(fs->s_blocksize > SBSIZE)
395 /* Godmar thinks: if the blocksize is greater than 1024, then
396 the superblock is logically part of block zero.
397 */
398 logic_sb_block = 0;
399
400 for (i = 0; i < db_count; i++) {
401 error = bread(devvp , fsbtodb(fs, logic_sb_block + i + 1),
402 fs->s_blocksize, NOCRED, &fs->s_group_desc[i]);
403 if(error) {
404 for (j = 0; j < i; j++)
405 brelse(fs->s_group_desc[j]);
406 bsd_free(fs->s_group_desc, M_UFSMNT);
407 printf("EXT2-fs: unable to read group descriptors (%d)\n", error);
408 return EIO;
409 }
410 /* Set the B_LOCKED flag on the buffer, then brelse() it */
411 LCK_BUF(fs->s_group_desc[i])
412 }
413 if(!ext2_check_descriptors(fs)) {
414 for (j = 0; j < db_count; j++)
415 ULCK_BUF(fs->s_group_desc[j])
416 bsd_free(fs->s_group_desc, M_UFSMNT);
417 printf("EXT2-fs: (ext2_check_descriptors failure) "
418 "unable to read group descriptors\n");
419 return EIO;
420 }
421
422 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
423 fs->s_inode_bitmap_number[i] = 0;
424 fs->s_inode_bitmap[i] = NULL;
425 fs->s_block_bitmap_number[i] = 0;
426 fs->s_block_bitmap[i] = NULL;
427 }
428 fs->s_loaded_inode_bitmaps = 0;
429 fs->s_loaded_block_bitmaps = 0;
430 return 0;
431}
432
433/*
434 * Reload all incore data for a filesystem (used after running fsck on
435 * the root filesystem and finding things to fix). The filesystem must
436 * be mounted read-only.
437 *
438 * Things to do to update the mount:
439 * 1) invalidate all cached meta-data.
440 * 2) re-read superblock from disk.
441 * 3) re-read summary information from disk.
442 * 4) invalidate all inactive vnodes.
443 * 5) invalidate all cached file data.
444 * 6) re-read inode data for all active vnodes.
445 */
446static int
447ext2_reload(mountp, cred, p)
448 register struct mount *mountp;
449 struct ucred *cred;
450 struct proc *p;
451{
452 register struct vnode *vp, *nvp, *devvp;
453 struct inode *ip;
454 struct buf *bp;
455 struct ext2_super_block * es;
456 struct ext2_sb_info *fs;
457 int error;
458
459 if ((mountp->mnt_flag & MNT_RDONLY) == 0)
460 return (EINVAL);
461 /*
462 * Step 1: invalidate all cached meta-data.
463 */
464 devvp = VFSTOUFS(mountp)->um_devvp;
465 if (vinvalbuf(devvp, 0, cred, p, 0, 0))
466 panic("ext2_reload: dirty1");
467 /*
468 * Step 2: re-read superblock from disk.
469 * constants have been adjusted for ext2
470 */
471 if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp))
472 return (error);
473 es = (struct ext2_super_block *)bp->b_data;
474 if (es->s_magic != EXT2_SUPER_MAGIC) {
475 if(es->s_magic == EXT2_PRE_02B_MAGIC)
476 printf("This filesystem bears the magic number of a pre "
477 "0.2b version of ext2. This is not supported by "
478 "Lites.\n");
479 else
480 printf("Wrong magic number: %x (expected %x for ext2 fs\n",
481 es->s_magic, EXT2_SUPER_MAGIC);
482 brelse(bp);
483 return (EIO); /* XXX needs translation */
484 }
485 fs = VFSTOUFS(mountp)->um_e2fs;
486 bcopy(bp->b_data, fs->s_es, sizeof(struct ext2_super_block));
487
488 if(error = compute_sb_data(devvp, es, fs)) {
489 brelse(bp);
490 return error;
491 }
492#ifdef UNKLAR
493 if (fs->fs_sbsize < SBSIZE)
494 bp->b_flags |= B_INVAL;
495#endif
496 brelse(bp);
497
498loop:
499 for (vp = mountp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) {
500 nvp = vp->v_mntvnodes.le_next;
501 /*
502 * Step 4: invalidate all inactive vnodes.
503 */
504 if (vp->v_usecount == 0) {
505 vgone(vp);
506 continue;
507 }
508 /*
509 * Step 5: invalidate all cached file data.
510 */
511 if (vget(vp, LK_EXCLUSIVE, p))
512 goto loop;
513 if (vinvalbuf(vp, 0, cred, p, 0, 0))
514 panic("ext2_reload: dirty2");
515 /*
516 * Step 6: re-read inode data for all active vnodes.
517 */
518 ip = VTOI(vp);
519 if (error =
520 bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
521 (int)fs->s_blocksize, NOCRED, &bp)) {
522 vput(vp);
523 return (error);
524 }
525 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data +
526 EXT2_INODE_SIZE * ino_to_fsbo(fs, ip->i_number)),
527 &ip->i_din);
528 brelse(bp);
529 vput(vp);
530 if (vp->v_mount != mountp)
531 goto loop;
532 }
533 return (0);
534}
535
536/*
537 * Common code for mount and mountroot
538 */
539static int
540ext2_mountfs(devvp, mp, p)
541 register struct vnode *devvp;
542 struct mount *mp;
543 struct proc *p;
544{
545 register struct ufsmount *ump;
546 struct buf *bp;
547 register struct ext2_sb_info *fs;
548 struct ext2_super_block * es;
549 dev_t dev = devvp->v_rdev;
550 struct partinfo dpart;
551 int havepart = 0;
552 int error, i, size;
553 int ronly;
554
555 /*
556 * Disallow multiple mounts of the same device.
557 * Disallow mounting of a device that is currently in use
558 * (except for root, which might share swap device for miniroot).
559 * Flush out any old buffers remaining from a previous use.
560 */
561 if (error = vfs_mountedon(devvp))
562 return (error);
563 if (vcount(devvp) > 1 && devvp != rootvp)
564 return (EBUSY);
565 if (error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0))
566 return (error);
567#ifdef READONLY
568/* turn on this to force it to be read-only */
569 mp->mnt_flag |= MNT_RDONLY;
570#endif
571
572 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
573 if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p))
574 return (error);
575 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0)
576 size = DEV_BSIZE;
577 else {
578 havepart = 1;
579 size = dpart.disklab->d_secsize;
580 }
581
582 bp = NULL;
583 ump = NULL;
584 if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp))
585 goto out;
586 es = (struct ext2_super_block *)bp->b_data;
587 if (es->s_magic != EXT2_SUPER_MAGIC) {
588 if(es->s_magic == EXT2_PRE_02B_MAGIC)
589 printf("This filesystem bears the magic number of a pre "
590 "0.2b version of ext2. This is not supported by "
591 "Lites.\n");
592 else
593 printf("Wrong magic number: %x (expected %x for EXT2FS)\n",
594 es->s_magic, EXT2_SUPER_MAGIC);
595 error = EINVAL; /* XXX needs translation */
596 goto out;
597 }
598 ump = bsd_malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
599 bzero((caddr_t)ump, sizeof *ump);
600 ump->um_malloctype = M_EXT2NODE;
601 ump->um_blkatoff = ext2_blkatoff;
602 ump->um_truncate = ext2_truncate;
603 ump->um_update = ext2_update;
604 ump->um_valloc = ext2_valloc;
605 ump->um_vfree = ext2_vfree;
606 /* I don't know whether this is the right strategy. Note that
607 we dynamically allocate both a ext2_sb_info and a ext2_super_block
608 while Linux keeps the super block in a locked buffer
609 */
610 ump->um_e2fs = bsd_malloc(sizeof(struct ext2_sb_info),
611 M_UFSMNT, M_WAITOK);
612 ump->um_e2fs->s_es = bsd_malloc(sizeof(struct ext2_super_block),
613 M_UFSMNT, M_WAITOK);
614 bcopy(es, ump->um_e2fs->s_es, (u_int)sizeof(struct ext2_super_block));
615 if(error = compute_sb_data(devvp, ump->um_e2fs->s_es, ump->um_e2fs)) {
616 brelse(bp);
617 return error;
618 }
619 brelse(bp);
620 bp = NULL;
621 fs = ump->um_e2fs;
622 fs->s_rd_only = ronly; /* ronly is set according to mnt_flags */
623 if (!(fs->s_es->s_state & EXT2_VALID_FS)) {
624 printf("WARNING: %s was not properly dismounted\n",
625 fs->fs_fsmnt);
626 }
627 /* if the fs is not mounted read-only, make sure the super block is
628 always written back on a sync()
629 */
630 if (ronly == 0) {
631 fs->s_dirt = 1; /* mark it modified */
632 fs->s_es->s_state &= ~EXT2_VALID_FS; /* set fs invalid */
633 }
634 mp->mnt_data = (qaddr_t)ump;
635 mp->mnt_stat.f_fsid.val[0] = (long)dev;
|
636 mp->mnt_stat.f_fsid.val[1] = MOUNT_EXT2FS;
| 636 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
|
637 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
638 mp->mnt_flag |= MNT_LOCAL;
639 ump->um_mountp = mp;
640 ump->um_dev = dev;
641 ump->um_devvp = devvp;
642 /* setting those two parameters allows us to use
643 ufs_bmap w/o changse !
644 */
645 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
646 ump->um_bptrtodb = fs->s_es->s_log_block_size + 1;
647 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
648 for (i = 0; i < MAXQUOTAS; i++)
649 ump->um_quotas[i] = NULLVP;
650 devvp->v_specmountpoint = mp;
651 if (ronly == 0)
652 ext2_sbupdate(ump, MNT_WAIT);
653 return (0);
654out:
655 if (bp)
656 brelse(bp);
657 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
658 if (ump) {
659 bsd_free(ump->um_fs, M_UFSMNT);
660 bsd_free(ump, M_UFSMNT);
661 mp->mnt_data = (qaddr_t)0;
662 }
663 return (error);
664}
665
666/*
667 * unmount system call
668 */
669static int
670ext2_unmount(mp, mntflags, p)
671 struct mount *mp;
672 int mntflags;
673 struct proc *p;
674{
675 register struct ufsmount *ump;
676 register struct ext2_sb_info *fs;
677 int error, flags, ronly, i;
678
679 flags = 0;
680 if (mntflags & MNT_FORCE) {
681 if (mp->mnt_flag & MNT_ROOTFS)
682 return (EINVAL);
683 flags |= FORCECLOSE;
684 }
685 if (error = ext2_flushfiles(mp, flags, p))
686 return (error);
687 ump = VFSTOUFS(mp);
688 fs = ump->um_e2fs;
689 ronly = fs->s_rd_only;
690 if (!ronly) {
691 fs->s_es->s_state |= EXT2_VALID_FS; /* was fs_clean = 1 */
692 ext2_sbupdate(ump, MNT_WAIT);
693 }
694
695 /* release buffers containing group descriptors */
696 for(i = 0; i < fs->s_db_per_group; i++)
697 ULCK_BUF(fs->s_group_desc[i])
698
699 /* release cached inode/block bitmaps */
700 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
701 if (fs->s_inode_bitmap[i])
702 ULCK_BUF(fs->s_inode_bitmap[i])
703
704 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
705 if (fs->s_block_bitmap[i])
706 ULCK_BUF(fs->s_block_bitmap[i])
707
708 ump->um_devvp->v_specmountpoint = NULL;
709 error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE,
710 NOCRED, p);
711 vrele(ump->um_devvp);
712 bsd_free(fs->s_es, M_UFSMNT);
713 bsd_free(fs, M_UFSMNT);
714 bsd_free(ump, M_UFSMNT);
715 mp->mnt_data = (qaddr_t)0;
716 mp->mnt_flag &= ~MNT_LOCAL;
717 return (error);
718}
719
720/*
721 * Flush out all the files in a filesystem.
722 */
723static int
724ext2_flushfiles(mp, flags, p)
725 register struct mount *mp;
726 int flags;
727 struct proc *p;
728{
729 register struct ufsmount *ump;
730 int error;
731#if QUOTA
732 int i;
733#endif
734
735 ump = VFSTOUFS(mp);
736#if QUOTA
737 if (mp->mnt_flag & MNT_QUOTA) {
738 if (error = vflush(mp, NULLVP, SKIPSYSTEM|flags))
739 return (error);
740 for (i = 0; i < MAXQUOTAS; i++) {
741 if (ump->um_quotas[i] == NULLVP)
742 continue;
743 quotaoff(p, mp, i);
744 }
745 /*
746 * Here we fall through to vflush again to ensure
747 * that we have gotten rid of all the system vnodes.
748 */
749 }
750#endif
751 error = vflush(mp, NULLVP, flags);
752 return (error);
753}
754
755/*
756 * Get file system statistics.
757 * taken from ext2/super.c ext2_statfs
758 */
759static int
760ext2_statfs(mp, sbp, p)
761 struct mount *mp;
762 register struct statfs *sbp;
763 struct proc *p;
764{
765 unsigned long overhead;
766 unsigned long overhead_per_group;
767
768 register struct ufsmount *ump;
769 register struct ext2_sb_info *fs;
770 register struct ext2_super_block *es;
771
772 ump = VFSTOUFS(mp);
773 fs = ump->um_e2fs;
774 es = fs->s_es;
775
776 if (es->s_magic != EXT2_SUPER_MAGIC)
777 panic("ext2_statfs - magic number spoiled");
778
779 /*
780 * Compute the overhead (FS structures)
781 */
782 overhead_per_group = 1 /* super block */ +
783 fs->s_db_per_group +
784 1 /* block bitmap */ +
785 1 /* inode bitmap */ +
786 fs->s_itb_per_group;
787 overhead = es->s_first_data_block +
788 fs->s_groups_count * overhead_per_group;
789
| 637 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
638 mp->mnt_flag |= MNT_LOCAL;
639 ump->um_mountp = mp;
640 ump->um_dev = dev;
641 ump->um_devvp = devvp;
642 /* setting those two parameters allows us to use
643 ufs_bmap w/o changse !
644 */
645 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
646 ump->um_bptrtodb = fs->s_es->s_log_block_size + 1;
647 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
648 for (i = 0; i < MAXQUOTAS; i++)
649 ump->um_quotas[i] = NULLVP;
650 devvp->v_specmountpoint = mp;
651 if (ronly == 0)
652 ext2_sbupdate(ump, MNT_WAIT);
653 return (0);
654out:
655 if (bp)
656 brelse(bp);
657 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
658 if (ump) {
659 bsd_free(ump->um_fs, M_UFSMNT);
660 bsd_free(ump, M_UFSMNT);
661 mp->mnt_data = (qaddr_t)0;
662 }
663 return (error);
664}
665
666/*
667 * unmount system call
668 */
669static int
670ext2_unmount(mp, mntflags, p)
671 struct mount *mp;
672 int mntflags;
673 struct proc *p;
674{
675 register struct ufsmount *ump;
676 register struct ext2_sb_info *fs;
677 int error, flags, ronly, i;
678
679 flags = 0;
680 if (mntflags & MNT_FORCE) {
681 if (mp->mnt_flag & MNT_ROOTFS)
682 return (EINVAL);
683 flags |= FORCECLOSE;
684 }
685 if (error = ext2_flushfiles(mp, flags, p))
686 return (error);
687 ump = VFSTOUFS(mp);
688 fs = ump->um_e2fs;
689 ronly = fs->s_rd_only;
690 if (!ronly) {
691 fs->s_es->s_state |= EXT2_VALID_FS; /* was fs_clean = 1 */
692 ext2_sbupdate(ump, MNT_WAIT);
693 }
694
695 /* release buffers containing group descriptors */
696 for(i = 0; i < fs->s_db_per_group; i++)
697 ULCK_BUF(fs->s_group_desc[i])
698
699 /* release cached inode/block bitmaps */
700 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
701 if (fs->s_inode_bitmap[i])
702 ULCK_BUF(fs->s_inode_bitmap[i])
703
704 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
705 if (fs->s_block_bitmap[i])
706 ULCK_BUF(fs->s_block_bitmap[i])
707
708 ump->um_devvp->v_specmountpoint = NULL;
709 error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE,
710 NOCRED, p);
711 vrele(ump->um_devvp);
712 bsd_free(fs->s_es, M_UFSMNT);
713 bsd_free(fs, M_UFSMNT);
714 bsd_free(ump, M_UFSMNT);
715 mp->mnt_data = (qaddr_t)0;
716 mp->mnt_flag &= ~MNT_LOCAL;
717 return (error);
718}
719
720/*
721 * Flush out all the files in a filesystem.
722 */
723static int
724ext2_flushfiles(mp, flags, p)
725 register struct mount *mp;
726 int flags;
727 struct proc *p;
728{
729 register struct ufsmount *ump;
730 int error;
731#if QUOTA
732 int i;
733#endif
734
735 ump = VFSTOUFS(mp);
736#if QUOTA
737 if (mp->mnt_flag & MNT_QUOTA) {
738 if (error = vflush(mp, NULLVP, SKIPSYSTEM|flags))
739 return (error);
740 for (i = 0; i < MAXQUOTAS; i++) {
741 if (ump->um_quotas[i] == NULLVP)
742 continue;
743 quotaoff(p, mp, i);
744 }
745 /*
746 * Here we fall through to vflush again to ensure
747 * that we have gotten rid of all the system vnodes.
748 */
749 }
750#endif
751 error = vflush(mp, NULLVP, flags);
752 return (error);
753}
754
755/*
756 * Get file system statistics.
757 * taken from ext2/super.c ext2_statfs
758 */
759static int
760ext2_statfs(mp, sbp, p)
761 struct mount *mp;
762 register struct statfs *sbp;
763 struct proc *p;
764{
765 unsigned long overhead;
766 unsigned long overhead_per_group;
767
768 register struct ufsmount *ump;
769 register struct ext2_sb_info *fs;
770 register struct ext2_super_block *es;
771
772 ump = VFSTOUFS(mp);
773 fs = ump->um_e2fs;
774 es = fs->s_es;
775
776 if (es->s_magic != EXT2_SUPER_MAGIC)
777 panic("ext2_statfs - magic number spoiled");
778
779 /*
780 * Compute the overhead (FS structures)
781 */
782 overhead_per_group = 1 /* super block */ +
783 fs->s_db_per_group +
784 1 /* block bitmap */ +
785 1 /* inode bitmap */ +
786 fs->s_itb_per_group;
787 overhead = es->s_first_data_block +
788 fs->s_groups_count * overhead_per_group;
789
|
790 sbp->f_type = MOUNT_EXT2FS;
| |
791 sbp->f_bsize = EXT2_FRAG_SIZE(fs);
792 sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
793 sbp->f_blocks = es->s_blocks_count - overhead;
794 sbp->f_bfree = es->s_free_blocks_count;
795 sbp->f_bavail = sbp->f_bfree - es->s_r_blocks_count;
796 sbp->f_files = es->s_inodes_count;
797 sbp->f_ffree = es->s_free_inodes_count;
798 if (sbp != &mp->mnt_stat) {
| 790 sbp->f_bsize = EXT2_FRAG_SIZE(fs);
791 sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
792 sbp->f_blocks = es->s_blocks_count - overhead;
793 sbp->f_bfree = es->s_free_blocks_count;
794 sbp->f_bavail = sbp->f_bfree - es->s_r_blocks_count;
795 sbp->f_files = es->s_inodes_count;
796 sbp->f_ffree = es->s_free_inodes_count;
797 if (sbp != &mp->mnt_stat) {
|
| 798 sbp->f_type = mp->mnt_vfc->vfc_typenum;
|
799 bcopy((caddr_t)mp->mnt_stat.f_mntonname,
800 (caddr_t)&sbp->f_mntonname[0], MNAMELEN);
801 bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
802 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
803 }
804 return (0);
805}
806
807/*
808 * Go through the disk queues to initiate sandbagged IO;
809 * go through the inodes to write those that have been modified;
810 * initiate the writing of the super block if it has been modified.
811 *
812 * Note: we are always called with the filesystem marked `MPBUSY'.
813 */
814static int
815ext2_sync(mp, waitfor, cred, p)
816 struct mount *mp;
817 int waitfor;
818 struct ucred *cred;
819 struct proc *p;
820{
821 register struct vnode *vp;
822 register struct inode *ip;
823 register struct ufsmount *ump = VFSTOUFS(mp);
824 register struct ext2_sb_info *fs;
825 int error, allerror = 0;
826
827 fs = ump->um_e2fs;
828 /*
829 * Write back modified superblock.
830 * Consistency check that the superblock
831 * is still in the buffer cache.
832 */
833 if (fs->s_dirt) {
834 if (fs->s_rd_only != 0) { /* XXX */
835 printf("fs = %s\n", fs->fs_fsmnt);
836 panic("update: rofs mod");
837 }
838 fs->s_dirt = 0;
839 fs->s_es->s_wtime = time_second;
840 allerror = ext2_sbupdate(ump, waitfor);
841 }
842 /*
843 * Write back each (modified) inode.
844 */
845loop:
846 for (vp = mp->mnt_vnodelist.lh_first;
847 vp != NULL;
848 vp = vp->v_mntvnodes.le_next) {
849 /*
850 * If the vnode that we are about to sync is no longer
851 * associated with this mount point, start over.
852 */
853 if (vp->v_mount != mp)
854 goto loop;
855 if (VOP_ISLOCKED(vp))
856 continue;
857 if (vp->v_type == VNON) /* XXX why is this needed? (it is) */
858 continue;
859 ip = VTOI(vp);
860 if ((ip->i_flag &
861 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
862 vp->v_dirtyblkhd.lh_first == NULL)
863 continue;
864 if (vget(vp, LK_EXCLUSIVE, p))
865 goto loop;
866 if (error = VOP_FSYNC(vp, cred, waitfor, p))
867 allerror = error;
868 vput(vp);
869 }
870 /*
871 * Force stale file system control information to be flushed.
872 */
873 if (error = VOP_FSYNC(ump->um_devvp, cred, waitfor, p))
874 allerror = error;
875#if QUOTA
876 qsync(mp);
877#endif
878 return (allerror);
879}
880
881/*
882 * Look up a EXT2FS dinode number to find its incore vnode, otherwise read it
883 * in from disk. If it is in core, wait for the lock bit to clear, then
884 * return the inode locked. Detection and handling of mount points must be
885 * done by the calling routine.
886 */
887static int
888ext2_vget(mp, ino, vpp)
889 struct mount *mp;
890 ino_t ino;
891 struct vnode **vpp;
892{
893 register struct ext2_sb_info *fs;
894 register struct inode *ip;
895 struct ufsmount *ump;
896 struct buf *bp;
897 struct vnode *vp;
898 dev_t dev;
899 int i, error;
900 int used_blocks;
901
902 ump = VFSTOUFS(mp);
903 dev = ump->um_dev;
904restart:
905 if ((*vpp = ufs_ihashget(dev, ino)) != NULL)
906 return (0);
907
908 /*
909 * Lock out the creation of new entries in the FFS hash table in
910 * case getnewvnode() or MALLOC() blocks, otherwise a duplicate
911 * may occur!
912 */
913 if (ext2fs_inode_hash_lock) {
914 while (ext2fs_inode_hash_lock) {
915 ext2fs_inode_hash_lock = -1;
916 tsleep(&ext2fs_inode_hash_lock, PVM, "e2vget", 0);
917 }
918 goto restart;
919 }
920 ext2fs_inode_hash_lock = 1;
921
922 /*
923 * If this MALLOC() is performed after the getnewvnode()
924 * it might block, leaving a vnode with a NULL v_data to be
925 * found by ext2_sync() if a sync happens to fire right then,
926 * which will cause a panic because ext2_sync() blindly
927 * dereferences vp->v_data (as well it should).
928 */
929 MALLOC(ip, struct inode *, sizeof(struct inode), M_EXT2NODE, M_WAITOK);
930
931 /* Allocate a new vnode/inode. */
932 if (error = getnewvnode(VT_UFS, mp, ext2_vnodeop_p, &vp)) {
933 if (ext2fs_inode_hash_lock < 0)
934 wakeup(&ext2fs_inode_hash_lock);
935 ext2fs_inode_hash_lock = 0;
936 *vpp = NULL;
937 FREE(ip, M_EXT2NODE);
938 return (error);
939 }
940 bzero((caddr_t)ip, sizeof(struct inode));
941 vp->v_data = ip;
942 ip->i_vnode = vp;
943 ip->i_e2fs = fs = ump->um_e2fs;
944 ip->i_dev = dev;
945 ip->i_number = ino;
946#if QUOTA
947 for (i = 0; i < MAXQUOTAS; i++)
948 ip->i_dquot[i] = NODQUOT;
949#endif
950 /*
951 * Put it onto its hash chain and lock it so that other requests for
952 * this inode will block if they arrive while we are sleeping waiting
953 * for old data structures to be purged or for the contents of the
954 * disk portion of this inode to be read.
955 */
956 ufs_ihashins(ip);
957
958 if (ext2fs_inode_hash_lock < 0)
959 wakeup(&ext2fs_inode_hash_lock);
960 ext2fs_inode_hash_lock = 0;
961
962 /* Read in the disk contents for the inode, copy into the inode. */
963#if 0
964printf("ext2_vget(%d) dbn= %d ", ino, fsbtodb(fs, ino_to_fsba(fs, ino)));
965#endif
966 if (error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
967 (int)fs->s_blocksize, NOCRED, &bp)) {
968 /*
969 * The inode does not contain anything useful, so it would
970 * be misleading to leave it on its hash chain. With mode
971 * still zero, it will be unlinked and returned to the free
972 * list by vput().
973 */
974 vput(vp);
975 brelse(bp);
976 *vpp = NULL;
977 return (error);
978 }
979 /* convert ext2 inode to dinode */
980 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE *
981 ino_to_fsbo(fs, ino)), &ip->i_din);
982 ip->i_block_group = ino_to_cg(fs, ino);
983 ip->i_next_alloc_block = 0;
984 ip->i_next_alloc_goal = 0;
985 ip->i_prealloc_count = 0;
986 ip->i_prealloc_block = 0;
987 /* now we want to make sure that block pointers for unused
988 blocks are zeroed out - ext2_balloc depends on this
989 although for regular files and directories only
990 */
991 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
992 used_blocks = (ip->i_size+fs->s_blocksize-1) / fs->s_blocksize;
993 for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
994 ip->i_db[i] = 0;
995 }
996/*
997 ext2_print_inode(ip);
998*/
999 brelse(bp);
1000
1001 /*
1002 * Initialize the vnode from the inode, check for aliases.
1003 * Note that the underlying vnode may have changed.
1004 */
1005 if (error = ufs_vinit(mp, ext2_specop_p, ext2_fifoop_p, &vp)) {
1006 vput(vp);
1007 *vpp = NULL;
1008 return (error);
1009 }
1010 /*
1011 * Finish inode initialization now that aliasing has been resolved.
1012 */
1013 ip->i_devvp = ump->um_devvp;
1014 VREF(ip->i_devvp);
1015 /*
1016 * Set up a generation number for this inode if it does not
1017 * already have one. This should only happen on old filesystems.
1018 */
1019 if (ip->i_gen == 0) {
1020 ip->i_gen = random() / 2 + 1;
1021 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
1022 ip->i_flag |= IN_MODIFIED;
1023 }
1024 *vpp = vp;
1025 return (0);
1026}
1027
1028/*
1029 * File handle to vnode
1030 *
1031 * Have to be really careful about stale file handles:
1032 * - check that the inode number is valid
1033 * - call ext2_vget() to get the locked inode
1034 * - check for an unallocated inode (i_mode == 0)
1035 * - check that the given client host has export rights and return
1036 * those rights via. exflagsp and credanonp
1037 */
1038static int
1039ext2_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
1040 register struct mount *mp;
1041 struct fid *fhp;
1042 struct sockaddr *nam;
1043 struct vnode **vpp;
1044 int *exflagsp;
1045 struct ucred **credanonp;
1046{
1047 register struct ufid *ufhp;
1048 struct ext2_sb_info *fs;
1049
1050 ufhp = (struct ufid *)fhp;
1051 fs = VFSTOUFS(mp)->um_e2fs;
1052 if (ufhp->ufid_ino < ROOTINO ||
1053 ufhp->ufid_ino >= fs->s_groups_count * fs->s_es->s_inodes_per_group)
1054 return (ESTALE);
1055 return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp));
1056}
1057
1058/*
1059 * Vnode pointer to File handle
1060 */
1061/* ARGSUSED */
1062static int
1063ext2_vptofh(vp, fhp)
1064 struct vnode *vp;
1065 struct fid *fhp;
1066{
1067 register struct inode *ip;
1068 register struct ufid *ufhp;
1069
1070 ip = VTOI(vp);
1071 ufhp = (struct ufid *)fhp;
1072 ufhp->ufid_len = sizeof(struct ufid);
1073 ufhp->ufid_ino = ip->i_number;
1074 ufhp->ufid_gen = ip->i_gen;
1075 return (0);
1076}
1077
1078/*
1079 * Write a superblock and associated information back to disk.
1080 */
1081static int
1082ext2_sbupdate(mp, waitfor)
1083 struct ufsmount *mp;
1084 int waitfor;
1085{
1086 register struct ext2_sb_info *fs = mp->um_e2fs;
1087 register struct ext2_super_block *es = fs->s_es;
1088 register struct buf *bp;
1089 int i, error = 0;
1090/*
1091printf("\nupdating superblock, waitfor=%s\n", waitfor == MNT_WAIT ? "yes":"no");
1092*/
1093 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0);
1094 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2_super_block));
1095 if (waitfor == MNT_WAIT)
1096 error = bwrite(bp);
1097 else
1098 bawrite(bp);
1099
1100 /*
1101 * The buffers for group descriptors, inode bitmaps and block bitmaps
1102 * are not busy at this point and are (hopefully) written by the
1103 * usual sync mechanism. No need to write them here
1104 */
1105
1106 return (error);
1107}
| 799 bcopy((caddr_t)mp->mnt_stat.f_mntonname,
800 (caddr_t)&sbp->f_mntonname[0], MNAMELEN);
801 bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
802 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
803 }
804 return (0);
805}
806
807/*
808 * Go through the disk queues to initiate sandbagged IO;
809 * go through the inodes to write those that have been modified;
810 * initiate the writing of the super block if it has been modified.
811 *
812 * Note: we are always called with the filesystem marked `MPBUSY'.
813 */
814static int
815ext2_sync(mp, waitfor, cred, p)
816 struct mount *mp;
817 int waitfor;
818 struct ucred *cred;
819 struct proc *p;
820{
821 register struct vnode *vp;
822 register struct inode *ip;
823 register struct ufsmount *ump = VFSTOUFS(mp);
824 register struct ext2_sb_info *fs;
825 int error, allerror = 0;
826
827 fs = ump->um_e2fs;
828 /*
829 * Write back modified superblock.
830 * Consistency check that the superblock
831 * is still in the buffer cache.
832 */
833 if (fs->s_dirt) {
834 if (fs->s_rd_only != 0) { /* XXX */
835 printf("fs = %s\n", fs->fs_fsmnt);
836 panic("update: rofs mod");
837 }
838 fs->s_dirt = 0;
839 fs->s_es->s_wtime = time_second;
840 allerror = ext2_sbupdate(ump, waitfor);
841 }
842 /*
843 * Write back each (modified) inode.
844 */
845loop:
846 for (vp = mp->mnt_vnodelist.lh_first;
847 vp != NULL;
848 vp = vp->v_mntvnodes.le_next) {
849 /*
850 * If the vnode that we are about to sync is no longer
851 * associated with this mount point, start over.
852 */
853 if (vp->v_mount != mp)
854 goto loop;
855 if (VOP_ISLOCKED(vp))
856 continue;
857 if (vp->v_type == VNON) /* XXX why is this needed? (it is) */
858 continue;
859 ip = VTOI(vp);
860 if ((ip->i_flag &
861 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
862 vp->v_dirtyblkhd.lh_first == NULL)
863 continue;
864 if (vget(vp, LK_EXCLUSIVE, p))
865 goto loop;
866 if (error = VOP_FSYNC(vp, cred, waitfor, p))
867 allerror = error;
868 vput(vp);
869 }
870 /*
871 * Force stale file system control information to be flushed.
872 */
873 if (error = VOP_FSYNC(ump->um_devvp, cred, waitfor, p))
874 allerror = error;
875#if QUOTA
876 qsync(mp);
877#endif
878 return (allerror);
879}
880
881/*
882 * Look up a EXT2FS dinode number to find its incore vnode, otherwise read it
883 * in from disk. If it is in core, wait for the lock bit to clear, then
884 * return the inode locked. Detection and handling of mount points must be
885 * done by the calling routine.
886 */
887static int
888ext2_vget(mp, ino, vpp)
889 struct mount *mp;
890 ino_t ino;
891 struct vnode **vpp;
892{
893 register struct ext2_sb_info *fs;
894 register struct inode *ip;
895 struct ufsmount *ump;
896 struct buf *bp;
897 struct vnode *vp;
898 dev_t dev;
899 int i, error;
900 int used_blocks;
901
902 ump = VFSTOUFS(mp);
903 dev = ump->um_dev;
904restart:
905 if ((*vpp = ufs_ihashget(dev, ino)) != NULL)
906 return (0);
907
908 /*
909 * Lock out the creation of new entries in the FFS hash table in
910 * case getnewvnode() or MALLOC() blocks, otherwise a duplicate
911 * may occur!
912 */
913 if (ext2fs_inode_hash_lock) {
914 while (ext2fs_inode_hash_lock) {
915 ext2fs_inode_hash_lock = -1;
916 tsleep(&ext2fs_inode_hash_lock, PVM, "e2vget", 0);
917 }
918 goto restart;
919 }
920 ext2fs_inode_hash_lock = 1;
921
922 /*
923 * If this MALLOC() is performed after the getnewvnode()
924 * it might block, leaving a vnode with a NULL v_data to be
925 * found by ext2_sync() if a sync happens to fire right then,
926 * which will cause a panic because ext2_sync() blindly
927 * dereferences vp->v_data (as well it should).
928 */
929 MALLOC(ip, struct inode *, sizeof(struct inode), M_EXT2NODE, M_WAITOK);
930
931 /* Allocate a new vnode/inode. */
932 if (error = getnewvnode(VT_UFS, mp, ext2_vnodeop_p, &vp)) {
933 if (ext2fs_inode_hash_lock < 0)
934 wakeup(&ext2fs_inode_hash_lock);
935 ext2fs_inode_hash_lock = 0;
936 *vpp = NULL;
937 FREE(ip, M_EXT2NODE);
938 return (error);
939 }
940 bzero((caddr_t)ip, sizeof(struct inode));
941 vp->v_data = ip;
942 ip->i_vnode = vp;
943 ip->i_e2fs = fs = ump->um_e2fs;
944 ip->i_dev = dev;
945 ip->i_number = ino;
946#if QUOTA
947 for (i = 0; i < MAXQUOTAS; i++)
948 ip->i_dquot[i] = NODQUOT;
949#endif
950 /*
951 * Put it onto its hash chain and lock it so that other requests for
952 * this inode will block if they arrive while we are sleeping waiting
953 * for old data structures to be purged or for the contents of the
954 * disk portion of this inode to be read.
955 */
956 ufs_ihashins(ip);
957
958 if (ext2fs_inode_hash_lock < 0)
959 wakeup(&ext2fs_inode_hash_lock);
960 ext2fs_inode_hash_lock = 0;
961
962 /* Read in the disk contents for the inode, copy into the inode. */
963#if 0
964printf("ext2_vget(%d) dbn= %d ", ino, fsbtodb(fs, ino_to_fsba(fs, ino)));
965#endif
966 if (error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
967 (int)fs->s_blocksize, NOCRED, &bp)) {
968 /*
969 * The inode does not contain anything useful, so it would
970 * be misleading to leave it on its hash chain. With mode
971 * still zero, it will be unlinked and returned to the free
972 * list by vput().
973 */
974 vput(vp);
975 brelse(bp);
976 *vpp = NULL;
977 return (error);
978 }
979 /* convert ext2 inode to dinode */
980 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE *
981 ino_to_fsbo(fs, ino)), &ip->i_din);
982 ip->i_block_group = ino_to_cg(fs, ino);
983 ip->i_next_alloc_block = 0;
984 ip->i_next_alloc_goal = 0;
985 ip->i_prealloc_count = 0;
986 ip->i_prealloc_block = 0;
987 /* now we want to make sure that block pointers for unused
988 blocks are zeroed out - ext2_balloc depends on this
989 although for regular files and directories only
990 */
991 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
992 used_blocks = (ip->i_size+fs->s_blocksize-1) / fs->s_blocksize;
993 for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
994 ip->i_db[i] = 0;
995 }
996/*
997 ext2_print_inode(ip);
998*/
999 brelse(bp);
1000
1001 /*
1002 * Initialize the vnode from the inode, check for aliases.
1003 * Note that the underlying vnode may have changed.
1004 */
1005 if (error = ufs_vinit(mp, ext2_specop_p, ext2_fifoop_p, &vp)) {
1006 vput(vp);
1007 *vpp = NULL;
1008 return (error);
1009 }
1010 /*
1011 * Finish inode initialization now that aliasing has been resolved.
1012 */
1013 ip->i_devvp = ump->um_devvp;
1014 VREF(ip->i_devvp);
1015 /*
1016 * Set up a generation number for this inode if it does not
1017 * already have one. This should only happen on old filesystems.
1018 */
1019 if (ip->i_gen == 0) {
1020 ip->i_gen = random() / 2 + 1;
1021 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
1022 ip->i_flag |= IN_MODIFIED;
1023 }
1024 *vpp = vp;
1025 return (0);
1026}
1027
1028/*
1029 * File handle to vnode
1030 *
1031 * Have to be really careful about stale file handles:
1032 * - check that the inode number is valid
1033 * - call ext2_vget() to get the locked inode
1034 * - check for an unallocated inode (i_mode == 0)
1035 * - check that the given client host has export rights and return
1036 * those rights via. exflagsp and credanonp
1037 */
1038static int
1039ext2_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
1040 register struct mount *mp;
1041 struct fid *fhp;
1042 struct sockaddr *nam;
1043 struct vnode **vpp;
1044 int *exflagsp;
1045 struct ucred **credanonp;
1046{
1047 register struct ufid *ufhp;
1048 struct ext2_sb_info *fs;
1049
1050 ufhp = (struct ufid *)fhp;
1051 fs = VFSTOUFS(mp)->um_e2fs;
1052 if (ufhp->ufid_ino < ROOTINO ||
1053 ufhp->ufid_ino >= fs->s_groups_count * fs->s_es->s_inodes_per_group)
1054 return (ESTALE);
1055 return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp));
1056}
1057
1058/*
1059 * Vnode pointer to File handle
1060 */
1061/* ARGSUSED */
1062static int
1063ext2_vptofh(vp, fhp)
1064 struct vnode *vp;
1065 struct fid *fhp;
1066{
1067 register struct inode *ip;
1068 register struct ufid *ufhp;
1069
1070 ip = VTOI(vp);
1071 ufhp = (struct ufid *)fhp;
1072 ufhp->ufid_len = sizeof(struct ufid);
1073 ufhp->ufid_ino = ip->i_number;
1074 ufhp->ufid_gen = ip->i_gen;
1075 return (0);
1076}
1077
1078/*
1079 * Write a superblock and associated information back to disk.
1080 */
1081static int
1082ext2_sbupdate(mp, waitfor)
1083 struct ufsmount *mp;
1084 int waitfor;
1085{
1086 register struct ext2_sb_info *fs = mp->um_e2fs;
1087 register struct ext2_super_block *es = fs->s_es;
1088 register struct buf *bp;
1089 int i, error = 0;
1090/*
1091printf("\nupdating superblock, waitfor=%s\n", waitfor == MNT_WAIT ? "yes":"no");
1092*/
1093 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0);
1094 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2_super_block));
1095 if (waitfor == MNT_WAIT)
1096 error = bwrite(bp);
1097 else
1098 bawrite(bp);
1099
1100 /*
1101 * The buffers for group descriptors, inode bitmaps and block bitmaps
1102 * are not busy at this point and are (hopefully) written by the
1103 * usual sync mechanism. No need to write them here
1104 */
1105
1106 return (error);
1107}
|