This source file includes following definitions.
- minix_put_inode
- minix_commit_super
- minix_write_super
- minix_put_super
- minix_remount
- minix_read_super
- minix_statfs
- V1_block_bmap
- V1_minix_bmap
- V2_block_bmap
- V2_minix_bmap
- minix_bmap
- V1_inode_getblk
- V1_block_getblk
- V1_minix_getblk
- V2_inode_getblk
- V2_block_getblk
- V2_minix_getblk
- minix_getblk
- minix_bread
- V1_minix_read_inode
- V2_minix_read_inode
- minix_read_inode
- V1_minix_update_inode
- V2_minix_update_inode
- minix_update_inode
- minix_write_inode
- minix_sync_inode
- init_minix_fs
- init_module
- cleanup_module
1
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5
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7
8
9
10 #include <linux/module.h>
11
12 #include <linux/sched.h>
13 #include <linux/minix_fs.h>
14 #include <linux/kernel.h>
15 #include <linux/mm.h>
16 #include <linux/string.h>
17 #include <linux/stat.h>
18 #include <linux/locks.h>
19
20 #include <asm/system.h>
21 #include <asm/segment.h>
22 #include <asm/bitops.h>
23
24 void minix_put_inode(struct inode *inode)
25 {
26 if (inode->i_nlink)
27 return;
28 inode->i_size = 0;
29 minix_truncate(inode);
30 minix_free_inode(inode);
31 }
32
33 static void minix_commit_super (struct super_block * sb,
34 struct minix_super_block * ms)
35 {
36 mark_buffer_dirty(sb->u.minix_sb.s_sbh, 1);
37 sb->s_dirt = 0;
38 }
39
40 void minix_write_super (struct super_block * sb)
41 {
42 struct minix_super_block * ms;
43
44 if (!(sb->s_flags & MS_RDONLY)) {
45 ms = sb->u.minix_sb.s_ms;
46
47 if (ms->s_state & MINIX_VALID_FS)
48 ms->s_state &= ~MINIX_VALID_FS;
49 minix_commit_super (sb, ms);
50 }
51 sb->s_dirt = 0;
52 }
53
54
55 void minix_put_super(struct super_block *sb)
56 {
57 int i;
58
59 lock_super(sb);
60 if (!(sb->s_flags & MS_RDONLY)) {
61 sb->u.minix_sb.s_ms->s_state = sb->u.minix_sb.s_mount_state;
62 mark_buffer_dirty(sb->u.minix_sb.s_sbh, 1);
63 }
64 sb->s_dev = 0;
65 for(i = 0 ; i < MINIX_I_MAP_SLOTS ; i++)
66 brelse(sb->u.minix_sb.s_imap[i]);
67 for(i = 0 ; i < MINIX_Z_MAP_SLOTS ; i++)
68 brelse(sb->u.minix_sb.s_zmap[i]);
69 brelse (sb->u.minix_sb.s_sbh);
70 unlock_super(sb);
71 MOD_DEC_USE_COUNT;
72 return;
73 }
74
75 static struct super_operations minix_sops = {
76 minix_read_inode,
77 NULL,
78 minix_write_inode,
79 minix_put_inode,
80 minix_put_super,
81 minix_write_super,
82 minix_statfs,
83 minix_remount
84 };
85
86 int minix_remount (struct super_block * sb, int * flags, char * data)
87 {
88 struct minix_super_block * ms;
89
90 ms = sb->u.minix_sb.s_ms;
91 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
92 return 0;
93 if (*flags & MS_RDONLY) {
94 if (ms->s_state & MINIX_VALID_FS ||
95 !(sb->u.minix_sb.s_mount_state & MINIX_VALID_FS))
96 return 0;
97
98 ms->s_state = sb->u.minix_sb.s_mount_state;
99 mark_buffer_dirty(sb->u.minix_sb.s_sbh, 1);
100 sb->s_dirt = 1;
101 minix_commit_super (sb, ms);
102 }
103 else {
104
105 sb->u.minix_sb.s_mount_state = ms->s_state;
106 ms->s_state &= ~MINIX_VALID_FS;
107 mark_buffer_dirty(sb->u.minix_sb.s_sbh, 1);
108 sb->s_dirt = 1;
109
110 if (!(sb->u.minix_sb.s_mount_state & MINIX_VALID_FS))
111 printk ("MINIX-fs warning: remounting unchecked fs, "
112 "running fsck is recommended.\n");
113 else if ((sb->u.minix_sb.s_mount_state & MINIX_ERROR_FS))
114 printk ("MINIX-fs warning: remounting fs with errors, "
115 "running fsck is recommended.\n");
116 }
117 return 0;
118 }
119
120 struct super_block *minix_read_super(struct super_block *s,void *data,
121 int silent)
122 {
123 struct buffer_head *bh;
124 struct minix_super_block *ms;
125 int i, block;
126 kdev_t dev = s->s_dev;
127
128 if (32 != sizeof (struct minix_inode))
129 panic("bad V1 i-node size");
130 if (64 != sizeof(struct minix2_inode))
131 panic("bad V2 i-node size");
132 MOD_INC_USE_COUNT;
133 lock_super(s);
134 set_blocksize(dev, BLOCK_SIZE);
135 if (!(bh = bread(dev,1,BLOCK_SIZE))) {
136 s->s_dev = 0;
137 unlock_super(s);
138 printk("MINIX-fs: unable to read superblock\n");
139 MOD_DEC_USE_COUNT;
140 return NULL;
141 }
142 ms = (struct minix_super_block *) bh->b_data;
143 s->u.minix_sb.s_ms = ms;
144 s->u.minix_sb.s_sbh = bh;
145 s->u.minix_sb.s_mount_state = ms->s_state;
146 s->s_blocksize = 1024;
147 s->s_blocksize_bits = 10;
148 s->u.minix_sb.s_ninodes = ms->s_ninodes;
149 s->u.minix_sb.s_imap_blocks = ms->s_imap_blocks;
150 s->u.minix_sb.s_zmap_blocks = ms->s_zmap_blocks;
151 s->u.minix_sb.s_firstdatazone = ms->s_firstdatazone;
152 s->u.minix_sb.s_log_zone_size = ms->s_log_zone_size;
153 s->u.minix_sb.s_max_size = ms->s_max_size;
154 s->s_magic = ms->s_magic;
155 if (s->s_magic == MINIX_SUPER_MAGIC) {
156 s->u.minix_sb.s_version = MINIX_V1;
157 s->u.minix_sb.s_nzones = ms->s_nzones;
158 s->u.minix_sb.s_dirsize = 16;
159 s->u.minix_sb.s_namelen = 14;
160 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
161 s->u.minix_sb.s_version = MINIX_V1;
162 s->u.minix_sb.s_nzones = ms->s_nzones;
163 s->u.minix_sb.s_dirsize = 32;
164 s->u.minix_sb.s_namelen = 30;
165 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
166 s->u.minix_sb.s_version = MINIX_V2;
167 s->u.minix_sb.s_nzones = ms->s_zones;
168 s->u.minix_sb.s_dirsize = 16;
169 s->u.minix_sb.s_namelen = 14;
170 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
171 s->u.minix_sb.s_version = MINIX_V2;
172 s->u.minix_sb.s_nzones = ms->s_zones;
173 s->u.minix_sb.s_dirsize = 32;
174 s->u.minix_sb.s_namelen = 30;
175 } else {
176 s->s_dev = 0;
177 unlock_super(s);
178 brelse(bh);
179 if (!silent)
180 printk("VFS: Can't find a minix or minix V2 filesystem on dev "
181 "%s.\n", kdevname(dev));
182 MOD_DEC_USE_COUNT;
183 return NULL;
184 }
185 for (i=0;i < MINIX_I_MAP_SLOTS;i++)
186 s->u.minix_sb.s_imap[i] = NULL;
187 for (i=0;i < MINIX_Z_MAP_SLOTS;i++)
188 s->u.minix_sb.s_zmap[i] = NULL;
189 block=2;
190 for (i=0 ; i < s->u.minix_sb.s_imap_blocks ; i++)
191 if ((s->u.minix_sb.s_imap[i]=bread(dev,block,BLOCK_SIZE)) != NULL)
192 block++;
193 else
194 break;
195 for (i=0 ; i < s->u.minix_sb.s_zmap_blocks ; i++)
196 if ((s->u.minix_sb.s_zmap[i]=bread(dev,block,BLOCK_SIZE)) != NULL)
197 block++;
198 else
199 break;
200 if (block != 2+s->u.minix_sb.s_imap_blocks+s->u.minix_sb.s_zmap_blocks) {
201 for(i=0;i<MINIX_I_MAP_SLOTS;i++)
202 brelse(s->u.minix_sb.s_imap[i]);
203 for(i=0;i<MINIX_Z_MAP_SLOTS;i++)
204 brelse(s->u.minix_sb.s_zmap[i]);
205 s->s_dev = 0;
206 unlock_super(s);
207 brelse(bh);
208 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
209 MOD_DEC_USE_COUNT;
210 return NULL;
211 }
212 set_bit(0,s->u.minix_sb.s_imap[0]->b_data);
213 set_bit(0,s->u.minix_sb.s_zmap[0]->b_data);
214 unlock_super(s);
215
216 s->s_dev = dev;
217 s->s_op = &minix_sops;
218 s->s_mounted = iget(s,MINIX_ROOT_INO);
219 if (!s->s_mounted) {
220 s->s_dev = 0;
221 brelse(bh);
222 printk("MINIX-fs: get root inode failed\n");
223 MOD_DEC_USE_COUNT;
224 return NULL;
225 }
226 if (!(s->s_flags & MS_RDONLY)) {
227 ms->s_state &= ~MINIX_VALID_FS;
228 mark_buffer_dirty(bh, 1);
229 s->s_dirt = 1;
230 }
231 if (!(s->u.minix_sb.s_mount_state & MINIX_VALID_FS))
232 printk ("MINIX-fs: mounting unchecked file system, "
233 "running fsck is recommended.\n");
234 else if (s->u.minix_sb.s_mount_state & MINIX_ERROR_FS)
235 printk ("MINIX-fs: mounting file system with errors, "
236 "running fsck is recommended.\n");
237 return s;
238 }
239
240 void minix_statfs(struct super_block *sb, struct statfs *buf, int bufsiz)
241 {
242 struct statfs tmp;
243
244 tmp.f_type = sb->s_magic;
245 tmp.f_bsize = sb->s_blocksize;
246 tmp.f_blocks = (sb->u.minix_sb.s_nzones - sb->u.minix_sb.s_firstdatazone) << sb->u.minix_sb.s_log_zone_size;
247 tmp.f_bfree = minix_count_free_blocks(sb);
248 tmp.f_bavail = tmp.f_bfree;
249 tmp.f_files = sb->u.minix_sb.s_ninodes;
250 tmp.f_ffree = minix_count_free_inodes(sb);
251 tmp.f_namelen = sb->u.minix_sb.s_namelen;
252 memcpy_tofs(buf, &tmp, bufsiz);
253 }
254
255
256
257
258 #define V1_inode_bmap(inode,nr) (((unsigned short *)(inode)->u.minix_i.u.i1_data)[(nr)])
259
260 static int V1_block_bmap(struct buffer_head * bh, int nr)
261 {
262 int tmp;
263
264 if (!bh)
265 return 0;
266 tmp = ((unsigned short *) bh->b_data)[nr];
267 brelse(bh);
268 return tmp;
269 }
270
271 static int V1_minix_bmap(struct inode * inode,int block)
272 {
273 int i;
274
275 if (block<0) {
276 printk("minix_bmap: block<0");
277 return 0;
278 }
279 if (block >= (inode->i_sb->u.minix_sb.s_max_size/BLOCK_SIZE)) {
280 printk("minix_bmap: block>big");
281 return 0;
282 }
283 if (block < 7)
284 return V1_inode_bmap(inode,block);
285 block -= 7;
286 if (block < 512) {
287 i = V1_inode_bmap(inode,7);
288 if (!i)
289 return 0;
290 return V1_block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block);
291 }
292 block -= 512;
293 i = V1_inode_bmap(inode,8);
294 if (!i)
295 return 0;
296 i = V1_block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block>>9);
297 if (!i)
298 return 0;
299 return V1_block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block & 511);
300 }
301
302
303
304
305 #define V2_inode_bmap(inode,nr) (((unsigned long *)(inode)->u.minix_i.u.i2_data)[(nr)])
306 static int V2_block_bmap(struct buffer_head * bh, int nr)
307 {
308 int tmp;
309
310 if (!bh)
311 return 0;
312 tmp = ((unsigned long *) bh->b_data)[nr];
313 brelse(bh);
314 return tmp;
315 }
316
317 int V2_minix_bmap(struct inode * inode,int block)
318 {
319 int i;
320
321 if (block<0) {
322 printk("minix_bmap: block<0");
323 return 0;
324 }
325 if (block >= (inode->i_sb->u.minix_sb.s_max_size/BLOCK_SIZE)) {
326 printk("minix_bmap: block>big");
327 return 0;
328 }
329 if (block < 7)
330 return V2_inode_bmap(inode,block);
331 block -= 7;
332 if (block < 256) {
333 i = V2_inode_bmap(inode,7);
334 if (!i)
335 return 0;
336 return V2_block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block);
337 }
338 block -= 256;
339 if (block < 256*256) {
340 i = V2_inode_bmap(inode,8);
341 if (!i)
342 return 0;
343 i = V2_block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block >> 8);
344 if (!i)
345 return 0;
346 return V2_block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block & 255);
347 }
348 block -= 256*256;
349 i = V2_inode_bmap(inode,9);
350 if (!i)
351 return 0;
352 i = V2_block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block >> 16);
353 if (!i)
354 return 0;
355 i = V2_block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),(block >> 8) & 255);
356 if (!i)
357 return 0;
358 return V2_block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block & 255);
359 }
360
361
362
363
364 int minix_bmap(struct inode * inode,int block)
365 {
366 if (INODE_VERSION(inode) == MINIX_V1)
367 return V1_minix_bmap(inode, block);
368 else
369 return V2_minix_bmap(inode, block);
370 }
371
372
373
374
375 static struct buffer_head * V1_inode_getblk(struct inode * inode, int nr,
376 int create)
377 {
378 int tmp;
379 unsigned short *p;
380 struct buffer_head * result;
381
382 p = inode->u.minix_i.u.i1_data + nr;
383 repeat:
384 tmp = *p;
385 if (tmp) {
386 result = getblk(inode->i_dev, tmp, BLOCK_SIZE);
387 if (tmp == *p)
388 return result;
389 brelse(result);
390 goto repeat;
391 }
392 if (!create)
393 return NULL;
394 tmp = minix_new_block(inode->i_sb);
395 if (!tmp)
396 return NULL;
397 result = getblk(inode->i_dev, tmp, BLOCK_SIZE);
398 if (*p) {
399 minix_free_block(inode->i_sb,tmp);
400 brelse(result);
401 goto repeat;
402 }
403 *p = tmp;
404 inode->i_ctime = CURRENT_TIME;
405 inode->i_dirt = 1;
406 return result;
407 }
408
409 static struct buffer_head * V1_block_getblk(struct inode * inode,
410 struct buffer_head * bh, int nr, int create)
411 {
412 int tmp;
413 unsigned short *p;
414 struct buffer_head * result;
415
416 if (!bh)
417 return NULL;
418 if (!buffer_uptodate(bh)) {
419 ll_rw_block(READ, 1, &bh);
420 wait_on_buffer(bh);
421 if (!buffer_uptodate(bh)) {
422 brelse(bh);
423 return NULL;
424 }
425 }
426 p = nr + (unsigned short *) bh->b_data;
427 repeat:
428 tmp = *p;
429 if (tmp) {
430 result = getblk(bh->b_dev, tmp, BLOCK_SIZE);
431 if (tmp == *p) {
432 brelse(bh);
433 return result;
434 }
435 brelse(result);
436 goto repeat;
437 }
438 if (!create) {
439 brelse(bh);
440 return NULL;
441 }
442 tmp = minix_new_block(inode->i_sb);
443 if (!tmp) {
444 brelse(bh);
445 return NULL;
446 }
447 result = getblk(bh->b_dev, tmp, BLOCK_SIZE);
448 if (*p) {
449 minix_free_block(inode->i_sb,tmp);
450 brelse(result);
451 goto repeat;
452 }
453 *p = tmp;
454 mark_buffer_dirty(bh, 1);
455 brelse(bh);
456 return result;
457 }
458
459 static struct buffer_head * V1_minix_getblk(struct inode * inode, int block,
460 int create)
461 {
462 struct buffer_head * bh;
463
464 if (block<0) {
465 printk("minix_getblk: block<0");
466 return NULL;
467 }
468 if (block >= inode->i_sb->u.minix_sb.s_max_size/BLOCK_SIZE) {
469 printk("minix_getblk: block>big");
470 return NULL;
471 }
472 if (block < 7)
473 return V1_inode_getblk(inode,block,create);
474 block -= 7;
475 if (block < 512) {
476 bh = V1_inode_getblk(inode,7,create);
477 return V1_block_getblk(inode, bh, block, create);
478 }
479 block -= 512;
480 bh = V1_inode_getblk(inode,8,create);
481 bh = V1_block_getblk(inode, bh, (block>>9) & 511, create);
482 return V1_block_getblk(inode, bh, block & 511, create);
483 }
484
485
486
487
488 static struct buffer_head * V2_inode_getblk(struct inode * inode, int nr,
489 int create)
490 {
491 int tmp;
492 unsigned long *p;
493 struct buffer_head * result;
494
495 p = (unsigned long *) inode->u.minix_i.u.i2_data + nr;
496 repeat:
497 tmp = *p;
498 if (tmp) {
499 result = getblk(inode->i_dev, tmp, BLOCK_SIZE);
500 if (tmp == *p)
501 return result;
502 brelse(result);
503 goto repeat;
504 }
505 if (!create)
506 return NULL;
507 tmp = minix_new_block(inode->i_sb);
508 if (!tmp)
509 return NULL;
510 result = getblk(inode->i_dev, tmp, BLOCK_SIZE);
511 if (*p) {
512 minix_free_block(inode->i_sb,tmp);
513 brelse(result);
514 goto repeat;
515 }
516 *p = tmp;
517 inode->i_ctime = CURRENT_TIME;
518 inode->i_dirt = 1;
519 return result;
520 }
521
522 static struct buffer_head * V2_block_getblk(struct inode * inode,
523 struct buffer_head * bh, int nr, int create)
524 {
525 int tmp;
526 unsigned long *p;
527 struct buffer_head * result;
528
529 if (!bh)
530 return NULL;
531 if (!buffer_uptodate(bh)) {
532 ll_rw_block(READ, 1, &bh);
533 wait_on_buffer(bh);
534 if (!buffer_uptodate(bh)) {
535 brelse(bh);
536 return NULL;
537 }
538 }
539 p = nr + (unsigned long *) bh->b_data;
540 repeat:
541 tmp = *p;
542 if (tmp) {
543 result = getblk(bh->b_dev, tmp, BLOCK_SIZE);
544 if (tmp == *p) {
545 brelse(bh);
546 return result;
547 }
548 brelse(result);
549 goto repeat;
550 }
551 if (!create) {
552 brelse(bh);
553 return NULL;
554 }
555 tmp = minix_new_block(inode->i_sb);
556 if (!tmp) {
557 brelse(bh);
558 return NULL;
559 }
560 result = getblk(bh->b_dev, tmp, BLOCK_SIZE);
561 if (*p) {
562 minix_free_block(inode->i_sb,tmp);
563 brelse(result);
564 goto repeat;
565 }
566 *p = tmp;
567 mark_buffer_dirty(bh, 1);
568 brelse(bh);
569 return result;
570 }
571
572 static struct buffer_head * V2_minix_getblk(struct inode * inode, int block,
573 int create)
574 {
575 struct buffer_head * bh;
576
577 if (block<0) {
578 printk("minix_getblk: block<0");
579 return NULL;
580 }
581 if (block >= inode->i_sb->u.minix_sb.s_max_size/BLOCK_SIZE) {
582 printk("minix_getblk: block>big");
583 return NULL;
584 }
585 if (block < 7)
586 return V2_inode_getblk(inode,block,create);
587 block -= 7;
588 if (block < 256) {
589 bh = V2_inode_getblk(inode,7,create);
590 return V2_block_getblk(inode, bh, block, create);
591 }
592 block -= 256;
593 if (block < 256*256) {
594 bh = V2_inode_getblk(inode,8,create);
595 bh = V2_block_getblk(inode, bh, (block>>8) & 255, create);
596 return V2_block_getblk(inode, bh, block & 255, create);
597 }
598 block -= 256*256;
599 bh = V2_inode_getblk(inode,9,create);
600 bh = V2_block_getblk(inode, bh, (block >> 16) & 255, create);
601 bh = V2_block_getblk(inode, bh, (block >> 8) & 255, create);
602 return V2_block_getblk(inode, bh, block & 255, create);
603 }
604
605
606
607
608 struct buffer_head * minix_getblk(struct inode * inode, int block, int create)
609 {
610 if (INODE_VERSION(inode) == MINIX_V1)
611 return V1_minix_getblk(inode,block,create);
612 else
613 return V2_minix_getblk(inode,block,create);
614 }
615
616 struct buffer_head * minix_bread(struct inode * inode, int block, int create)
617 {
618 struct buffer_head * bh;
619
620 bh = minix_getblk(inode,block,create);
621 if (!bh || buffer_uptodate(bh))
622 return bh;
623 ll_rw_block(READ, 1, &bh);
624 wait_on_buffer(bh);
625 if (buffer_uptodate(bh))
626 return bh;
627 brelse(bh);
628 return NULL;
629 }
630
631
632
633
634 static void V1_minix_read_inode(struct inode * inode)
635 {
636 struct buffer_head * bh;
637 struct minix_inode * raw_inode;
638 int block, ino;
639
640 ino = inode->i_ino;
641 inode->i_op = NULL;
642 inode->i_mode = 0;
643 if (!ino || ino >= inode->i_sb->u.minix_sb.s_ninodes) {
644 printk("Bad inode number on dev %s"
645 ": %d is out of range\n",
646 kdevname(inode->i_dev), ino);
647 return;
648 }
649 block = 2 + inode->i_sb->u.minix_sb.s_imap_blocks +
650 inode->i_sb->u.minix_sb.s_zmap_blocks +
651 (ino-1)/MINIX_INODES_PER_BLOCK;
652 if (!(bh=bread(inode->i_dev,block, BLOCK_SIZE))) {
653 printk("Major problem: unable to read inode from dev "
654 "%s\n", kdevname(inode->i_dev));
655 return;
656 }
657 raw_inode = ((struct minix_inode *) bh->b_data) +
658 (ino-1)%MINIX_INODES_PER_BLOCK;
659 inode->i_mode = raw_inode->i_mode;
660 inode->i_uid = raw_inode->i_uid;
661 inode->i_gid = raw_inode->i_gid;
662 inode->i_nlink = raw_inode->i_nlinks;
663 inode->i_size = raw_inode->i_size;
664 inode->i_mtime = inode->i_atime = inode->i_ctime = raw_inode->i_time;
665 inode->i_blocks = inode->i_blksize = 0;
666 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
667 inode->i_rdev = to_kdev_t(raw_inode->i_zone[0]);
668 else for (block = 0; block < 9; block++)
669 inode->u.minix_i.u.i1_data[block] = raw_inode->i_zone[block];
670 brelse(bh);
671 if (S_ISREG(inode->i_mode))
672 inode->i_op = &minix_file_inode_operations;
673 else if (S_ISDIR(inode->i_mode))
674 inode->i_op = &minix_dir_inode_operations;
675 else if (S_ISLNK(inode->i_mode))
676 inode->i_op = &minix_symlink_inode_operations;
677 else if (S_ISCHR(inode->i_mode))
678 inode->i_op = &chrdev_inode_operations;
679 else if (S_ISBLK(inode->i_mode))
680 inode->i_op = &blkdev_inode_operations;
681 else if (S_ISFIFO(inode->i_mode))
682 init_fifo(inode);
683 }
684
685
686
687
688 static void V2_minix_read_inode(struct inode * inode)
689 {
690 struct buffer_head * bh;
691 struct minix2_inode * raw_inode;
692 int block, ino;
693
694 ino = inode->i_ino;
695 inode->i_op = NULL;
696 inode->i_mode = 0;
697 if (!ino || ino >= inode->i_sb->u.minix_sb.s_ninodes) {
698 printk("Bad inode number on dev %s"
699 ": %d is out of range\n",
700 kdevname(inode->i_dev), ino);
701 return;
702 }
703 block = 2 + inode->i_sb->u.minix_sb.s_imap_blocks +
704 inode->i_sb->u.minix_sb.s_zmap_blocks +
705 (ino-1)/MINIX2_INODES_PER_BLOCK;
706 if (!(bh=bread(inode->i_dev,block, BLOCK_SIZE))) {
707 printk("Major problem: unable to read inode from dev "
708 "%s\n", kdevname(inode->i_dev));
709 return;
710 }
711 raw_inode = ((struct minix2_inode *) bh->b_data) +
712 (ino-1)%MINIX2_INODES_PER_BLOCK;
713 inode->i_mode = raw_inode->i_mode;
714 inode->i_uid = raw_inode->i_uid;
715 inode->i_gid = raw_inode->i_gid;
716 inode->i_nlink = raw_inode->i_nlinks;
717 inode->i_size = raw_inode->i_size;
718 inode->i_mtime = raw_inode->i_mtime;
719 inode->i_atime = raw_inode->i_atime;
720 inode->i_ctime = raw_inode->i_ctime;
721 inode->i_blocks = inode->i_blksize = 0;
722 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
723 inode->i_rdev = to_kdev_t(raw_inode->i_zone[0]);
724 else for (block = 0; block < 10; block++)
725 inode->u.minix_i.u.i2_data[block] = raw_inode->i_zone[block];
726 brelse(bh);
727 if (S_ISREG(inode->i_mode))
728 inode->i_op = &minix_file_inode_operations;
729 else if (S_ISDIR(inode->i_mode))
730 inode->i_op = &minix_dir_inode_operations;
731 else if (S_ISLNK(inode->i_mode))
732 inode->i_op = &minix_symlink_inode_operations;
733 else if (S_ISCHR(inode->i_mode))
734 inode->i_op = &chrdev_inode_operations;
735 else if (S_ISBLK(inode->i_mode))
736 inode->i_op = &blkdev_inode_operations;
737 else if (S_ISFIFO(inode->i_mode))
738 init_fifo(inode);
739 }
740
741
742
743
744 void minix_read_inode(struct inode * inode)
745 {
746 if (INODE_VERSION(inode) == MINIX_V1)
747 V1_minix_read_inode(inode);
748 else
749 V2_minix_read_inode(inode);
750 }
751
752
753
754
755 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
756 {
757 struct buffer_head * bh;
758 struct minix_inode * raw_inode;
759 int ino, block;
760
761 ino = inode->i_ino;
762 if (!ino || ino >= inode->i_sb->u.minix_sb.s_ninodes) {
763 printk("Bad inode number on dev %s"
764 ": %d is out of range\n",
765 kdevname(inode->i_dev), ino);
766 inode->i_dirt = 0;
767 return 0;
768 }
769 block = 2 + inode->i_sb->u.minix_sb.s_imap_blocks + inode->i_sb->u.minix_sb.s_zmap_blocks +
770 (ino-1)/MINIX_INODES_PER_BLOCK;
771 if (!(bh=bread(inode->i_dev, block, BLOCK_SIZE))) {
772 printk("unable to read i-node block\n");
773 inode->i_dirt = 0;
774 return 0;
775 }
776 raw_inode = ((struct minix_inode *)bh->b_data) +
777 (ino-1)%MINIX_INODES_PER_BLOCK;
778 raw_inode->i_mode = inode->i_mode;
779 raw_inode->i_uid = inode->i_uid;
780 raw_inode->i_gid = inode->i_gid;
781 raw_inode->i_nlinks = inode->i_nlink;
782 raw_inode->i_size = inode->i_size;
783 raw_inode->i_time = inode->i_mtime;
784 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
785 raw_inode->i_zone[0] = kdev_t_to_nr(inode->i_rdev);
786 else for (block = 0; block < 9; block++)
787 raw_inode->i_zone[block] = inode->u.minix_i.u.i1_data[block];
788 inode->i_dirt=0;
789 mark_buffer_dirty(bh, 1);
790 return bh;
791 }
792
793
794
795
796 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
797 {
798 struct buffer_head * bh;
799 struct minix2_inode * raw_inode;
800 int ino, block;
801
802 ino = inode->i_ino;
803 if (!ino || ino >= inode->i_sb->u.minix_sb.s_ninodes) {
804 printk("Bad inode number on dev %s"
805 ": %d is out of range\n",
806 kdevname(inode->i_dev), ino);
807 inode->i_dirt = 0;
808 return 0;
809 }
810 block = 2 + inode->i_sb->u.minix_sb.s_imap_blocks + inode->i_sb->u.minix_sb.s_zmap_blocks +
811 (ino-1)/MINIX2_INODES_PER_BLOCK;
812 if (!(bh=bread(inode->i_dev, block, BLOCK_SIZE))) {
813 printk("unable to read i-node block\n");
814 inode->i_dirt = 0;
815 return 0;
816 }
817 raw_inode = ((struct minix2_inode *)bh->b_data) +
818 (ino-1)%MINIX2_INODES_PER_BLOCK;
819 raw_inode->i_mode = inode->i_mode;
820 raw_inode->i_uid = inode->i_uid;
821 raw_inode->i_gid = inode->i_gid;
822 raw_inode->i_nlinks = inode->i_nlink;
823 raw_inode->i_size = inode->i_size;
824 raw_inode->i_mtime = inode->i_mtime;
825 raw_inode->i_atime = inode->i_atime;
826 raw_inode->i_ctime = inode->i_ctime;
827 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
828 raw_inode->i_zone[0] = kdev_t_to_nr(inode->i_rdev);
829 else for (block = 0; block < 10; block++)
830 raw_inode->i_zone[block] = inode->u.minix_i.u.i2_data[block];
831 inode->i_dirt=0;
832 mark_buffer_dirty(bh, 1);
833 return bh;
834 }
835
836 struct buffer_head *minix_update_inode(struct inode *inode)
837 {
838 if (INODE_VERSION(inode) == MINIX_V1)
839 return V1_minix_update_inode(inode);
840 else
841 return V2_minix_update_inode(inode);
842 }
843
844 void minix_write_inode(struct inode * inode)
845 {
846 struct buffer_head *bh;
847
848 bh = minix_update_inode(inode);
849 brelse(bh);
850 }
851
852 int minix_sync_inode(struct inode * inode)
853 {
854 int err = 0;
855 struct buffer_head *bh;
856
857 bh = minix_update_inode(inode);
858 if (bh && buffer_dirty(bh))
859 {
860 ll_rw_block(WRITE, 1, &bh);
861 wait_on_buffer(bh);
862 if (buffer_req(bh) && !buffer_uptodate(bh))
863 {
864 printk ("IO error syncing minix inode ["
865 "%s:%08lx]\n",
866 kdevname(inode->i_dev), inode->i_ino);
867 err = -1;
868 }
869 }
870 else if (!bh)
871 err = -1;
872 brelse (bh);
873 return err;
874 }
875
876 static struct file_system_type minix_fs_type = {
877 minix_read_super, "minix", 1, NULL
878 };
879
880 int init_minix_fs(void)
881 {
882 return register_filesystem(&minix_fs_type);
883 }
884
885 #ifdef MODULE
886 int init_module(void)
887 {
888 int status;
889
890 if ((status = init_minix_fs()) == 0)
891 register_symtab(0);
892 return status;
893 }
894
895 void cleanup_module(void)
896 {
897 unregister_filesystem(&minix_fs_type);
898 }
899
900 #endif
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