This source file includes following definitions.
- sysv_put_inode
- detected_bs512
- detected_bs1024
- detect_xenix
- detected_xenix
- detect_sysv4
- detected_sysv4
- detect_sysv2
- detected_sysv2
- detect_coherent
- detected_coherent
- sysv_read_super
- sysv_write_super
- sysv_put_super
- sysv_statfs
- inode_bmap
- block_bmap
- sysv_bmap
- inode_getblk
- block_getblk
- sysv_getblk
- sysv_file_bread
- read3byte
- write3byte
- coh_read3byte
- coh_write3byte
- sysv_read_inode
- sysv_notify_change
- sysv_update_inode
- sysv_write_inode
- sysv_sync_inode
- init_module
- cleanup_module
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23 #ifdef MODULE
24 #include <linux/module.h>
25 #include <linux/version.h>
26 #else
27 #define MOD_INC_USE_COUNT
28 #define MOD_DEC_USE_COUNT
29 #endif
30
31 #include <linux/sched.h>
32 #include <linux/kernel.h>
33 #include <linux/fs.h>
34 #include <linux/sysv_fs.h>
35 #include <linux/stat.h>
36 #include <linux/string.h>
37 #include <linux/locks.h>
38
39 #include <asm/segment.h>
40
41 void sysv_put_inode(struct inode *inode)
42 {
43 if (inode->i_nlink)
44 return;
45 inode->i_size = 0;
46 sysv_truncate(inode);
47 sysv_free_inode(inode);
48 }
49
50
51 static struct super_operations sysv_sops = {
52 sysv_read_inode,
53 sysv_notify_change,
54 sysv_write_inode,
55 sysv_put_inode,
56 sysv_put_super,
57 sysv_write_super,
58 sysv_statfs,
59 NULL
60 };
61
62
63
64
65
66
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68
69
70
71 static void detected_bs512 (struct super_block *sb)
72 {
73 sb->sv_block_size = 512;
74 sb->sv_block_size_1 = 512-1;
75 sb->sv_block_size_bits = 9;
76 sb->sv_block_size_ratio = 2;
77 sb->sv_block_size_ratio_bits = 1;
78 sb->sv_inodes_per_block = 512/64;
79 sb->sv_inodes_per_block_1 = 512/64-1;
80 sb->sv_inodes_per_block_bits = 9-6;
81 sb->sv_toobig_block = 10 +
82 (sb->sv_ind_per_block = 512/4) +
83 (sb->sv_ind_per_block_2 = (512/4)*(512/4)) +
84 (sb->sv_ind_per_block_3 = (512/4)*(512/4)*(512/4));
85 sb->sv_ind_per_block_1 = 512/4-1;
86 sb->sv_ind_per_block_2_1 = (512/4)*(512/4)-1;
87 sb->sv_ind_per_block_2_bits = 2 *
88 (sb->sv_ind_per_block_bits = 9-2);
89 sb->sv_ind_per_block_block_size_1 = (512/4)*512-1;
90 sb->sv_ind_per_block_block_size_bits = (9-2)+9;
91 sb->sv_ind_per_block_2_block_size_1 = (512/4)*(512/4)*512-1;
92 sb->sv_ind_per_block_2_block_size_bits = (9-2)+(9-2)+9;
93 sb->sv_ind0_size = 10 * 512;
94 sb->sv_ind1_size = (10 + (512/4))* 512;
95 sb->sv_ind2_size = (10 + (512/4) + (512/4)*(512/4)) * 512;
96 }
97
98 static void detected_bs1024 (struct super_block *sb)
99 {
100 sb->sv_block_size = 1024;
101 sb->sv_block_size_1 = 1024-1;
102 sb->sv_block_size_bits = 10;
103 sb->sv_block_size_ratio = 1;
104 sb->sv_block_size_ratio_bits = 0;
105 sb->sv_inodes_per_block = 1024/64;
106 sb->sv_inodes_per_block_1 = 1024/64-1;
107 sb->sv_inodes_per_block_bits = 10-6;
108 sb->sv_toobig_block = 10 +
109 (sb->sv_ind_per_block = 1024/4) +
110 (sb->sv_ind_per_block_2 = (1024/4)*(1024/4)) +
111 (sb->sv_ind_per_block_3 = (1024/4)*(1024/4)*(1024/4));
112 sb->sv_ind_per_block_1 = 1024/4-1;
113 sb->sv_ind_per_block_2_1 = (1024/4)*(1024/4)-1;
114 sb->sv_ind_per_block_2_bits = 2 *
115 (sb->sv_ind_per_block_bits = 10-2);
116 sb->sv_ind_per_block_block_size_1 = (1024/4)*1024-1;
117 sb->sv_ind_per_block_block_size_bits = (10-2)+10;
118 sb->sv_ind_per_block_2_block_size_1 = (1024/4)*(1024/4)*1024-1;
119 sb->sv_ind_per_block_2_block_size_bits = (10-2)+(10-2)+10;
120 sb->sv_ind0_size = 10 * 1024;
121 sb->sv_ind1_size = (10 + (1024/4))* 1024;
122 sb->sv_ind2_size = (10 + (1024/4) + (1024/4)*(1024/4)) * 1024;
123 }
124
125 static const char* detect_xenix (struct super_block *sb, struct buffer_head *bh)
126 {
127 struct xenix_super_block * sbd;
128
129 sbd = (struct xenix_super_block *) bh->b_data;
130 if (sbd->s_magic != 0x2b5544)
131 return NULL;
132 switch (sbd->s_type) {
133 case 1: detected_bs512(sb); break;
134 case 2: detected_bs1024(sb); break;
135 default: return NULL;
136 }
137 sb->sv_type = FSTYPE_XENIX;
138 return "Xenix";
139 }
140 static struct super_block * detected_xenix (struct super_block *sb, struct buffer_head *bh1, struct buffer_head *bh2)
141 {
142 struct xenix_super_block * sbd1;
143 struct xenix_super_block * sbd2;
144
145 if (sb->sv_block_size == BLOCK_SIZE)
146
147 sbd1 = sbd2 = (struct xenix_super_block *) bh1->b_data;
148 else {
149
150 sbd1 = (struct xenix_super_block *) bh1->b_data;
151 sbd2 = (struct xenix_super_block *) (bh2->b_data - BLOCK_SIZE/2);
152
153 if (sbd2->s_magic != 0x2b5544)
154 return NULL;
155 }
156
157 sb->sv_convert = 0;
158 sb->sv_kludge_symlinks = 1;
159 sb->sv_truncate = 1;
160 sb->sv_link_max = XENIX_LINK_MAX;
161 sb->sv_fic_size = XENIX_NICINOD;
162 sb->sv_flc_size = XENIX_NICFREE;
163 sb->sv_bh1 = bh1;
164 sb->sv_bh2 = bh2;
165 sb->sv_sbd1 = (char *) sbd1;
166 sb->sv_sbd2 = (char *) sbd2;
167 sb->sv_sb_fic_count = &sbd1->s_ninode;
168 sb->sv_sb_fic_inodes = &sbd1->s_inode[0];
169 sb->sv_sb_total_free_inodes = &sbd2->s_tinode;
170 sb->sv_sb_flc_count = &sbd1->s_nfree;
171 sb->sv_sb_flc_blocks = &sbd1->s_free[0];
172 sb->sv_sb_total_free_blocks = &sbd2->s_tfree;
173 sb->sv_sb_time = &sbd2->s_time;
174 sb->sv_block_base = 0;
175 sb->sv_firstinodezone = 2;
176 sb->sv_firstdatazone = sbd1->s_isize;
177 sb->sv_nzones = sbd1->s_fsize;
178 sb->sv_ndatazones = sb->sv_nzones - sb->sv_firstdatazone;
179 return sb;
180 }
181
182 static const char* detect_sysv4 (struct super_block *sb, struct buffer_head *bh)
183 {
184 struct sysv4_super_block * sbd;
185
186 sbd = (struct sysv4_super_block *) (bh->b_data + BLOCK_SIZE/2);
187 if (sbd->s_magic != 0xfd187e20)
188 return NULL;
189 if (sbd->s_time < 315532800)
190 return NULL;
191 switch (sbd->s_type) {
192 case 1: detected_bs512(sb); break;
193 case 2: detected_bs1024(sb); break;
194 default: return NULL;
195 }
196 sb->sv_type = FSTYPE_SYSV4;
197 return "SystemV";
198 }
199 static struct super_block * detected_sysv4 (struct super_block *sb, struct buffer_head *bh)
200 {
201 struct sysv4_super_block * sbd;
202
203 if (sb->sv_block_size == BLOCK_SIZE)
204 sbd = (struct sysv4_super_block *) (bh->b_data + BLOCK_SIZE/2);
205 else {
206 sbd = (struct sysv4_super_block *) bh->b_data;
207
208 if (sbd->s_magic != 0xfd187e20)
209 return NULL;
210 if (sbd->s_time < 315532800)
211 return NULL;
212 }
213
214 sb->sv_convert = 0;
215 sb->sv_kludge_symlinks = 0;
216 sb->sv_truncate = 1;
217 sb->sv_link_max = SYSV_LINK_MAX;
218 sb->sv_fic_size = SYSV_NICINOD;
219 sb->sv_flc_size = SYSV_NICFREE;
220 sb->sv_bh1 = bh;
221 sb->sv_bh2 = bh;
222 sb->sv_sbd1 = (char *) sbd;
223 sb->sv_sbd2 = (char *) sbd;
224 sb->sv_sb_fic_count = &sbd->s_ninode;
225 sb->sv_sb_fic_inodes = &sbd->s_inode[0];
226 sb->sv_sb_total_free_inodes = &sbd->s_tinode;
227 sb->sv_sb_flc_count = &sbd->s_nfree;
228 sb->sv_sb_flc_blocks = &sbd->s_free[0];
229 sb->sv_sb_total_free_blocks = &sbd->s_tfree;
230 sb->sv_sb_time = &sbd->s_time;
231 sb->sv_sb_state = &sbd->s_state;
232 sb->sv_block_base = 0;
233 sb->sv_firstinodezone = 2;
234 sb->sv_firstdatazone = sbd->s_isize;
235 sb->sv_nzones = sbd->s_fsize;
236 sb->sv_ndatazones = sb->sv_nzones - sb->sv_firstdatazone;
237 return sb;
238 }
239
240 static const char* detect_sysv2 (struct super_block *sb, struct buffer_head *bh)
241 {
242 struct sysv2_super_block * sbd;
243
244 sbd = (struct sysv2_super_block *) (bh->b_data + BLOCK_SIZE/2);
245 if (sbd->s_magic != 0xfd187e20)
246 return NULL;
247 if (sbd->s_time < 315532800)
248 return NULL;
249 switch (sbd->s_type) {
250 case 1: detected_bs512(sb); break;
251 case 2: detected_bs1024(sb); break;
252 default: return NULL;
253 }
254 sb->sv_type = FSTYPE_SYSV2;
255 return "SystemV Release 2";
256 }
257 static struct super_block * detected_sysv2 (struct super_block *sb, struct buffer_head *bh)
258 {
259 struct sysv2_super_block * sbd;
260
261 if (sb->sv_block_size == BLOCK_SIZE)
262 sbd = (struct sysv2_super_block *) (bh->b_data + BLOCK_SIZE/2);
263 else {
264 sbd = (struct sysv2_super_block *) bh->b_data;
265
266 if (sbd->s_magic != 0xfd187e20)
267 return NULL;
268 if (sbd->s_time < 315532800)
269 return NULL;
270 }
271
272 sb->sv_convert = 0;
273 sb->sv_kludge_symlinks = 0;
274 sb->sv_truncate = 1;
275 sb->sv_link_max = SYSV_LINK_MAX;
276 sb->sv_fic_size = SYSV_NICINOD;
277 sb->sv_flc_size = SYSV_NICFREE;
278 sb->sv_bh1 = bh;
279 sb->sv_bh2 = bh;
280 sb->sv_sbd1 = (char *) sbd;
281 sb->sv_sbd2 = (char *) sbd;
282 sb->sv_sb_fic_count = &sbd->s_ninode;
283 sb->sv_sb_fic_inodes = &sbd->s_inode[0];
284 sb->sv_sb_total_free_inodes = &sbd->s_tinode;
285 sb->sv_sb_flc_count = &sbd->s_nfree;
286 sb->sv_sb_flc_blocks = &sbd->s_free[0];
287 sb->sv_sb_total_free_blocks = &sbd->s_tfree;
288 sb->sv_sb_time = &sbd->s_time;
289 sb->sv_sb_state = &sbd->s_state;
290 sb->sv_block_base = 0;
291 sb->sv_firstinodezone = 2;
292 sb->sv_firstdatazone = sbd->s_isize;
293 sb->sv_nzones = sbd->s_fsize;
294 sb->sv_ndatazones = sb->sv_nzones - sb->sv_firstdatazone;
295 return sb;
296 }
297
298 static const char* detect_coherent (struct super_block *sb, struct buffer_head *bh)
299 {
300 struct coh_super_block * sbd;
301
302 sbd = (struct coh_super_block *) (bh->b_data + BLOCK_SIZE/2);
303 if ((memcmp(sbd->s_fname,"noname",6) && memcmp(sbd->s_fname,"xxxxx ",6))
304 || (memcmp(sbd->s_fpack,"nopack",6) && memcmp(sbd->s_fpack,"xxxxx\n",6)))
305 return NULL;
306 detected_bs512(sb);
307 sb->sv_type = FSTYPE_COH;
308 return "Coherent";
309 }
310 static struct super_block * detected_coherent (struct super_block *sb, struct buffer_head *bh)
311 {
312 struct coh_super_block * sbd;
313
314 sbd = (struct coh_super_block *) bh->b_data;
315
316 if ((memcmp(sbd->s_fname,"noname",6) && memcmp(sbd->s_fname,"xxxxx ",6))
317 || (memcmp(sbd->s_fpack,"nopack",6) && memcmp(sbd->s_fpack,"xxxxx\n",6)))
318 return NULL;
319
320 sb->sv_convert = 1;
321 sb->sv_kludge_symlinks = 1;
322 sb->sv_truncate = 1;
323 sb->sv_link_max = COH_LINK_MAX;
324 sb->sv_fic_size = COH_NICINOD;
325 sb->sv_flc_size = COH_NICFREE;
326 sb->sv_bh1 = bh;
327 sb->sv_bh2 = bh;
328 sb->sv_sbd1 = (char *) sbd;
329 sb->sv_sbd2 = (char *) sbd;
330 sb->sv_sb_fic_count = &sbd->s_ninode;
331 sb->sv_sb_fic_inodes = &sbd->s_inode[0];
332 sb->sv_sb_total_free_inodes = &sbd->s_tinode;
333 sb->sv_sb_flc_count = &sbd->s_nfree;
334 sb->sv_sb_flc_blocks = &sbd->s_free[0];
335 sb->sv_sb_total_free_blocks = &sbd->s_tfree;
336 sb->sv_sb_time = &sbd->s_time;
337 sb->sv_block_base = 0;
338 sb->sv_firstinodezone = 2;
339 sb->sv_firstdatazone = sbd->s_isize;
340 sb->sv_nzones = from_coh_ulong(sbd->s_fsize);
341 sb->sv_ndatazones = sb->sv_nzones - sb->sv_firstdatazone;
342 return sb;
343 }
344
345 struct super_block *sysv_read_super(struct super_block *sb,void *data,
346 int silent)
347 {
348 struct buffer_head *bh;
349 const char *found;
350 kdev_t dev = sb->s_dev;
351
352 if (1024 != sizeof (struct xenix_super_block))
353 panic("Xenix FS: bad super-block size");
354 if ((512 != sizeof (struct sysv4_super_block))
355 || (512 != sizeof (struct sysv2_super_block)))
356 panic("SystemV FS: bad super-block size");
357 if (500 != sizeof (struct coh_super_block))
358 panic("Coherent FS: bad super-block size");
359 if (64 != sizeof (struct sysv_inode))
360 panic("sysv fs: bad i-node size");
361 MOD_INC_USE_COUNT;
362 lock_super(sb);
363 set_blocksize(dev,BLOCK_SIZE);
364
365
366 if ((bh = bread(dev, 1, BLOCK_SIZE)) != NULL) {
367 if ((found = detect_xenix(sb,bh)) != NULL)
368 goto ok;
369 brelse(bh);
370 }
371 if ((bh = bread(dev, 0, BLOCK_SIZE)) != NULL) {
372
373 if ((found = detect_sysv4(sb,bh)) != NULL)
374 goto ok;
375 if ((found = detect_sysv2(sb,bh)) != NULL)
376 goto ok;
377
378 if ((found = detect_coherent(sb,bh)) != NULL)
379 goto ok;
380 brelse(bh);
381 }
382
383
384 { static int offsets[] = { 9, 15, 18, };
385 int i;
386 for (i = 0; i < sizeof(offsets)/sizeof(offsets[0]); i++)
387 if ((bh = bread(dev, offsets[i], BLOCK_SIZE)) != NULL) {
388
389 if ((found = detect_sysv4(sb,bh)) != NULL) {
390 sb->sv_block_base = offsets[i] << sb->sv_block_size_ratio_bits;
391 goto ok;
392 }
393 if ((found = detect_sysv2(sb,bh)) != NULL) {
394 sb->sv_block_base = offsets[i] << sb->sv_block_size_ratio_bits;
395 goto ok;
396 }
397 brelse(bh);
398 }
399 }
400 sb->s_dev = 0;
401 unlock_super(sb);
402 if (!silent)
403 printk("VFS: unable to read Xenix/SystemV/Coherent superblock on device "
404 "%s\n", kdevname(dev));
405 failed:
406 MOD_DEC_USE_COUNT;
407 return NULL;
408
409 ok:
410 if (sb->sv_block_size == BLOCK_SIZE) {
411 switch (sb->sv_type) {
412 case FSTYPE_XENIX:
413 if (!detected_xenix(sb,bh,bh))
414 goto bad_superblock;
415 break;
416 case FSTYPE_SYSV4:
417 if (!detected_sysv4(sb,bh))
418 goto bad_superblock;
419 break;
420 case FSTYPE_SYSV2:
421 if (!detected_sysv2(sb,bh))
422 goto bad_superblock;
423 break;
424 default:
425 bad_superblock:
426 brelse(bh);
427 sb->s_dev = 0;
428 unlock_super(sb);
429 printk("SysV FS: cannot read superblock in 1024 byte mode\n");
430 goto failed;
431 }
432 } else {
433
434
435 struct buffer_head *bh1, *bh2;
436 unsigned long blocknr = bh->b_blocknr << sb->sv_block_size_ratio_bits;
437
438 brelse(bh);
439 set_blocksize(dev,sb->sv_block_size);
440 bh1 = NULL; bh2 = NULL;
441 switch (sb->sv_type) {
442 case FSTYPE_XENIX:
443 if ((bh1 = bread(dev, blocknr, sb->sv_block_size)) == NULL)
444 goto bad_superblock2;
445 if ((bh2 = bread(dev, blocknr+1, sb->sv_block_size)) == NULL)
446 goto bad_superblock2;
447 if (!detected_xenix(sb,bh1,bh2))
448 goto bad_superblock2;
449 break;
450 case FSTYPE_SYSV4:
451 if ((bh2 = bread(dev, blocknr+1, sb->sv_block_size)) == NULL)
452 goto bad_superblock2;
453 if (!detected_sysv4(sb,bh2))
454 goto bad_superblock2;
455 break;
456 case FSTYPE_SYSV2:
457 if ((bh2 = bread(dev, blocknr+1, sb->sv_block_size)) == NULL)
458 goto bad_superblock2;
459 if (!detected_sysv2(sb,bh2))
460 goto bad_superblock2;
461 break;
462 case FSTYPE_COH:
463 if ((bh2 = bread(dev, blocknr+1, sb->sv_block_size)) == NULL)
464 goto bad_superblock2;
465 if (!detected_coherent(sb,bh2))
466 goto bad_superblock2;
467 break;
468 default:
469 bad_superblock2:
470 brelse(bh1);
471 brelse(bh2);
472 set_blocksize(sb->s_dev,BLOCK_SIZE);
473 sb->s_dev = 0;
474 unlock_super(sb);
475 printk("SysV FS: cannot read superblock in 512 byte mode\n");
476 goto failed;
477 }
478 }
479 sb->sv_ninodes = (sb->sv_firstdatazone - sb->sv_firstinodezone) << sb->sv_inodes_per_block_bits;
480 if (!silent)
481 printk("VFS: Found a %s FS (block size = %d) on device %s\n",
482 found, sb->sv_block_size, kdevname(dev));
483 sb->s_magic = SYSV_MAGIC_BASE + sb->sv_type;
484
485 sb->s_blocksize = sb->sv_block_size;
486 sb->s_blocksize_bits = sb->sv_block_size_bits;
487
488 sb->s_dev = dev;
489 sb->s_op = &sysv_sops;
490 sb->s_mounted = iget(sb,SYSV_ROOT_INO);
491 unlock_super(sb);
492 if (!sb->s_mounted) {
493 printk("SysV FS: get root inode failed\n");
494 sysv_put_super(sb);
495 return NULL;
496 }
497 sb->s_dirt = 1;
498
499
500 return sb;
501 }
502
503
504 void sysv_write_super (struct super_block *sb)
505 {
506 lock_super(sb);
507 if (sb->sv_bh1->b_dirt || sb->sv_bh2->b_dirt) {
508
509
510
511 unsigned long time = CURRENT_TIME;
512 unsigned long old_time = *sb->sv_sb_time;
513 if (sb->sv_convert)
514 old_time = from_coh_ulong(old_time);
515 if (sb->sv_type == FSTYPE_SYSV4)
516 if (*sb->sv_sb_state == 0x7c269d38 - old_time)
517 *sb->sv_sb_state = 0x7c269d38 - time;
518 if (sb->sv_convert)
519 time = to_coh_ulong(time);
520 *sb->sv_sb_time = time;
521 mark_buffer_dirty(sb->sv_bh2, 1);
522 }
523 sb->s_dirt = 0;
524 unlock_super(sb);
525 }
526
527 void sysv_put_super(struct super_block *sb)
528 {
529
530 lock_super(sb);
531 brelse(sb->sv_bh1);
532 if (sb->sv_bh1 != sb->sv_bh2) brelse(sb->sv_bh2);
533
534 if (sb->s_blocksize != BLOCK_SIZE)
535 set_blocksize(sb->s_dev,BLOCK_SIZE);
536 sb->s_dev = 0;
537 unlock_super(sb);
538 MOD_DEC_USE_COUNT;
539 }
540
541 void sysv_statfs(struct super_block *sb, struct statfs *buf, int bufsiz)
542 {
543 struct statfs tmp;
544
545 tmp.f_type = sb->s_magic;
546 tmp.f_bsize = sb->sv_block_size;
547 tmp.f_blocks = sb->sv_ndatazones;
548 tmp.f_bfree = sysv_count_free_blocks(sb);
549 tmp.f_bavail = tmp.f_bfree;
550 tmp.f_files = sb->sv_ninodes;
551 tmp.f_ffree = sysv_count_free_inodes(sb);
552 tmp.f_namelen = SYSV_NAMELEN;
553 memcpy_tofs(buf, &tmp, bufsiz);
554 }
555
556
557
558
559 static inline int inode_bmap(struct super_block * sb, struct inode * inode, int nr)
560 {
561 int tmp = inode->u.sysv_i.i_data[nr];
562 if (!tmp)
563 return 0;
564 return tmp + sb->sv_block_base;
565 }
566
567 static int block_bmap(struct super_block * sb, struct buffer_head * bh, int nr, int convert)
568 {
569 int tmp;
570
571 if (!bh)
572 return 0;
573 tmp = ((sysv_zone_t *) bh->b_data) [nr];
574 if (convert)
575 tmp = from_coh_ulong(tmp);
576 brelse(bh);
577 if (!tmp)
578 return 0;
579 return tmp + sb->sv_block_base;
580 }
581
582 int sysv_bmap(struct inode * inode,int block_nr)
583 {
584 unsigned int block = block_nr;
585 struct super_block * sb = inode->i_sb;
586 int convert;
587 int i;
588 struct buffer_head * bh;
589
590 if (block < 10)
591 return inode_bmap(sb,inode,block);
592 block -= 10;
593 convert = sb->sv_convert;
594 if (block < sb->sv_ind_per_block) {
595 i = inode_bmap(sb,inode,10);
596 if (!i)
597 return 0;
598 bh = bread(inode->i_dev,i,sb->sv_block_size);
599 return block_bmap(sb, bh, block, convert);
600 }
601 block -= sb->sv_ind_per_block;
602 if (block < sb->sv_ind_per_block_2) {
603 i = inode_bmap(sb,inode,11);
604 if (!i)
605 return 0;
606 bh = bread(inode->i_dev,i,sb->sv_block_size);
607 i = block_bmap(sb, bh, block >> sb->sv_ind_per_block_bits, convert);
608 if (!i)
609 return 0;
610 bh = bread(inode->i_dev,i,sb->sv_block_size);
611 return block_bmap(sb, bh, block & sb->sv_ind_per_block_1, convert);
612 }
613 block -= sb->sv_ind_per_block_2;
614 if (block < sb->sv_ind_per_block_3) {
615 i = inode_bmap(sb,inode,12);
616 if (!i)
617 return 0;
618 bh = bread(inode->i_dev,i,sb->sv_block_size);
619 i = block_bmap(sb, bh, block >> sb->sv_ind_per_block_2_bits, convert);
620 if (!i)
621 return 0;
622 bh = bread(inode->i_dev,i,sb->sv_block_size);
623 i = block_bmap(sb, bh, (block >> sb->sv_ind_per_block_bits) & sb->sv_ind_per_block_1,convert);
624 if (!i)
625 return 0;
626 bh = bread(inode->i_dev,i,sb->sv_block_size);
627 return block_bmap(sb, bh, block & sb->sv_ind_per_block_1, convert);
628 }
629 if ((int)block<0) {
630 printk("sysv_bmap: block<0");
631 return 0;
632 }
633 printk("sysv_bmap: block>big");
634 return 0;
635 }
636
637
638
639
640
641
642 static struct buffer_head * inode_getblk(struct inode * inode, int nr, int create)
643 {
644 struct super_block *sb;
645 unsigned long tmp;
646 unsigned long *p;
647 struct buffer_head * result;
648
649 sb = inode->i_sb;
650 p = inode->u.sysv_i.i_data + nr;
651 repeat:
652 tmp = *p;
653 if (tmp) {
654 result = sv_getblk(sb, inode->i_dev, tmp);
655 if (tmp == *p)
656 return result;
657 brelse(result);
658 goto repeat;
659 }
660 if (!create)
661 return NULL;
662 tmp = sysv_new_block(sb);
663 if (!tmp)
664 return NULL;
665 result = sv_getblk(sb, inode->i_dev, tmp);
666 if (*p) {
667 sysv_free_block(sb,tmp);
668 brelse(result);
669 goto repeat;
670 }
671 *p = tmp;
672 inode->i_ctime = CURRENT_TIME;
673 inode->i_dirt = 1;
674 return result;
675 }
676
677 static struct buffer_head * block_getblk(struct inode * inode,
678 struct buffer_head * bh, int nr, int create)
679 {
680 struct super_block *sb;
681 unsigned long tmp, block;
682 sysv_zone_t *p;
683 struct buffer_head * result;
684
685 if (!bh)
686 return NULL;
687 if (!bh->b_uptodate) {
688 ll_rw_block(READ, 1, &bh);
689 wait_on_buffer(bh);
690 if (!bh->b_uptodate) {
691 brelse(bh);
692 return NULL;
693 }
694 }
695 sb = inode->i_sb;
696 p = nr + (sysv_zone_t *) bh->b_data;
697 repeat:
698 block = tmp = *p;
699 if (sb->sv_convert)
700 block = from_coh_ulong(block);
701 if (tmp) {
702 result = sv_getblk(sb, bh->b_dev, block);
703 if (tmp == *p) {
704 brelse(bh);
705 return result;
706 }
707 brelse(result);
708 goto repeat;
709 }
710 if (!create) {
711 brelse(bh);
712 return NULL;
713 }
714 block = sysv_new_block(sb);
715 if (!block) {
716 brelse(bh);
717 return NULL;
718 }
719 result = sv_getblk(sb, bh->b_dev, block);
720 if (*p) {
721 sysv_free_block(sb,block);
722 brelse(result);
723 goto repeat;
724 }
725 *p = (sb->sv_convert ? to_coh_ulong(block) : block);
726 mark_buffer_dirty(bh, 1);
727 brelse(bh);
728 return result;
729 }
730
731 struct buffer_head * sysv_getblk(struct inode * inode, unsigned int block, int create)
732 {
733 struct super_block * sb = inode->i_sb;
734 struct buffer_head * bh;
735
736 if (block < 10)
737 return inode_getblk(inode,block,create);
738 block -= 10;
739 if (block < sb->sv_ind_per_block) {
740 bh = inode_getblk(inode,10,create);
741 return block_getblk(inode, bh, block, create);
742 }
743 block -= sb->sv_ind_per_block;
744 if (block < sb->sv_ind_per_block_2) {
745 bh = inode_getblk(inode,11,create);
746 bh = block_getblk(inode, bh, block >> sb->sv_ind_per_block_bits, create);
747 return block_getblk(inode, bh, block & sb->sv_ind_per_block_1, create);
748 }
749 block -= sb->sv_ind_per_block_2;
750 if (block < sb->sv_ind_per_block_3) {
751 bh = inode_getblk(inode,12,create);
752 bh = block_getblk(inode, bh, block >> sb->sv_ind_per_block_2_bits, create);
753 bh = block_getblk(inode, bh, (block >> sb->sv_ind_per_block_bits) & sb->sv_ind_per_block_1, create);
754 return block_getblk(inode, bh, block & sb->sv_ind_per_block_1, create);
755 }
756 if ((int)block<0) {
757 printk("sysv_getblk: block<0");
758 return NULL;
759 }
760 printk("sysv_getblk: block>big");
761 return NULL;
762 }
763
764 struct buffer_head * sysv_file_bread(struct inode * inode, int block, int create)
765 {
766 struct buffer_head * bh;
767
768 bh = sysv_getblk(inode,block,create);
769 if (!bh || bh->b_uptodate)
770 return bh;
771 ll_rw_block(READ, 1, &bh);
772 wait_on_buffer(bh);
773 if (bh->b_uptodate)
774 return bh;
775 brelse(bh);
776 return NULL;
777 }
778
779
780 static inline unsigned long read3byte (char * p)
781 {
782 return (unsigned long)(*(unsigned short *)p)
783 | (unsigned long)(*(unsigned char *)(p+2)) << 16;
784 }
785
786 static inline void write3byte (char * p, unsigned long val)
787 {
788 *(unsigned short *)p = (unsigned short) val;
789 *(unsigned char *)(p+2) = val >> 16;
790 }
791
792 static inline unsigned long coh_read3byte (char * p)
793 {
794 return (unsigned long)(*(unsigned char *)p) << 16
795 | (unsigned long)(*(unsigned short *)(p+1));
796 }
797
798 static inline void coh_write3byte (char * p, unsigned long val)
799 {
800 *(unsigned char *)p = val >> 16;
801 *(unsigned short *)(p+1) = (unsigned short) val;
802 }
803
804 void sysv_read_inode(struct inode * inode)
805 {
806 struct super_block * sb = inode->i_sb;
807 struct buffer_head * bh;
808 struct sysv_inode * raw_inode;
809 unsigned int block, ino;
810 umode_t mode;
811
812 ino = inode->i_ino;
813 inode->i_op = NULL;
814 inode->i_mode = 0;
815 if (!ino || ino > sb->sv_ninodes) {
816 printk("Bad inode number on dev %s"
817 ": %d is out of range\n",
818 kdevname(inode->i_dev), ino);
819 return;
820 }
821 block = sb->sv_firstinodezone + ((ino-1) >> sb->sv_inodes_per_block_bits);
822 if (!(bh = sv_bread(sb,inode->i_dev,block))) {
823 printk("Major problem: unable to read inode from dev "
824 "%s\n",
825 kdevname(inode->i_dev));
826 return;
827 }
828 raw_inode = (struct sysv_inode *) bh->b_data + ((ino-1) & sb->sv_inodes_per_block_1);
829 mode = raw_inode->i_mode;
830 if (sb->sv_kludge_symlinks)
831 mode = from_coh_imode(mode);
832
833 inode->i_mode = mode;
834 inode->i_uid = raw_inode->i_uid;
835 inode->i_gid = raw_inode->i_gid;
836 inode->i_nlink = raw_inode->i_nlink;
837 if (sb->sv_convert) {
838 inode->i_size = from_coh_ulong(raw_inode->i_size);
839 inode->i_atime = from_coh_ulong(raw_inode->i_atime);
840 inode->i_mtime = from_coh_ulong(raw_inode->i_mtime);
841 inode->i_ctime = from_coh_ulong(raw_inode->i_ctime);
842 } else {
843 inode->i_size = raw_inode->i_size;
844 inode->i_atime = raw_inode->i_atime;
845 inode->i_mtime = raw_inode->i_mtime;
846 inode->i_ctime = raw_inode->i_ctime;
847 }
848 inode->i_blocks = inode->i_blksize = 0;
849 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
850 inode->i_rdev = to_kdev_t(raw_inode->i_a.i_rdev);
851 else
852 if (sb->sv_convert)
853 for (block = 0; block < 10+1+1+1; block++)
854 inode->u.sysv_i.i_data[block] =
855 coh_read3byte(&raw_inode->i_a.i_addb[3*block]);
856 else
857 for (block = 0; block < 10+1+1+1; block++)
858 inode->u.sysv_i.i_data[block] =
859 read3byte(&raw_inode->i_a.i_addb[3*block]);
860 brelse(bh);
861 if (S_ISREG(inode->i_mode))
862 inode->i_op = &sysv_file_inode_operations;
863 else if (S_ISDIR(inode->i_mode))
864 inode->i_op = &sysv_dir_inode_operations;
865 else if (S_ISLNK(inode->i_mode))
866 inode->i_op = &sysv_symlink_inode_operations;
867 else if (S_ISCHR(inode->i_mode))
868 inode->i_op = &chrdev_inode_operations;
869 else if (S_ISBLK(inode->i_mode))
870 inode->i_op = &blkdev_inode_operations;
871 else if (S_ISFIFO(inode->i_mode))
872 init_fifo(inode);
873 }
874
875
876 extern int sysv_notify_change(struct inode *inode, struct iattr *attr)
877 {
878 int error;
879
880 if ((error = inode_change_ok(inode, attr)) != 0)
881 return error;
882
883 if (attr->ia_valid & ATTR_MODE)
884 if (inode->i_sb->sv_kludge_symlinks)
885 if (attr->ia_mode == COH_KLUDGE_SYMLINK_MODE)
886 attr->ia_mode = COH_KLUDGE_NOT_SYMLINK;
887
888 inode_setattr(inode, attr);
889
890 return 0;
891 }
892
893 static struct buffer_head * sysv_update_inode(struct inode * inode)
894 {
895 struct super_block * sb = inode->i_sb;
896 struct buffer_head * bh;
897 struct sysv_inode * raw_inode;
898 unsigned int ino, block;
899 umode_t mode;
900
901 ino = inode->i_ino;
902 if (!ino || ino > sb->sv_ninodes) {
903 printk("Bad inode number on dev %s"
904 ": %d is out of range\n",
905 kdevname(inode->i_dev), ino);
906 inode->i_dirt = 0;
907 return 0;
908 }
909 block = sb->sv_firstinodezone + ((ino-1) >> sb->sv_inodes_per_block_bits);
910 if (!(bh = sv_bread(sb,inode->i_dev,block))) {
911 printk("unable to read i-node block\n");
912 inode->i_dirt = 0;
913 return 0;
914 }
915 raw_inode = (struct sysv_inode *) bh->b_data + ((ino-1) & sb->sv_inodes_per_block_1);
916 mode = inode->i_mode;
917 if (sb->sv_kludge_symlinks)
918 mode = to_coh_imode(mode);
919 raw_inode->i_mode = mode;
920 raw_inode->i_uid = inode->i_uid;
921 raw_inode->i_gid = inode->i_gid;
922 raw_inode->i_nlink = inode->i_nlink;
923 if (sb->sv_convert) {
924 raw_inode->i_size = to_coh_ulong(inode->i_size);
925 raw_inode->i_atime = to_coh_ulong(inode->i_atime);
926 raw_inode->i_mtime = to_coh_ulong(inode->i_mtime);
927 raw_inode->i_ctime = to_coh_ulong(inode->i_ctime);
928 } else {
929 raw_inode->i_size = inode->i_size;
930 raw_inode->i_atime = inode->i_atime;
931 raw_inode->i_mtime = inode->i_mtime;
932 raw_inode->i_ctime = inode->i_ctime;
933 }
934 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
935 raw_inode->i_a.i_rdev = kdev_t_to_nr(inode->i_rdev);
936 else
937 if (sb->sv_convert)
938 for (block = 0; block < 10+1+1+1; block++)
939 coh_write3byte(&raw_inode->i_a.i_addb[3*block],inode->u.sysv_i.i_data[block]);
940 else
941 for (block = 0; block < 10+1+1+1; block++)
942 write3byte(&raw_inode->i_a.i_addb[3*block],inode->u.sysv_i.i_data[block]);
943 inode->i_dirt=0;
944 mark_buffer_dirty(bh, 1);
945 return bh;
946 }
947
948 void sysv_write_inode(struct inode * inode)
949 {
950 struct buffer_head *bh;
951 bh = sysv_update_inode(inode);
952 brelse(bh);
953 }
954
955 int sysv_sync_inode(struct inode * inode)
956 {
957 int err = 0;
958 struct buffer_head *bh;
959
960 bh = sysv_update_inode(inode);
961 if (bh && bh->b_dirt) {
962 ll_rw_block(WRITE, 1, &bh);
963 wait_on_buffer(bh);
964 if (bh->b_req && !bh->b_uptodate)
965 {
966 printk ("IO error syncing sysv inode ["
967 "%s:%08lx]\n",
968 kdevname(inode->i_dev), inode->i_ino);
969 err = -1;
970 }
971 }
972 else if (!bh)
973 err = -1;
974 brelse (bh);
975 return err;
976 }
977
978 #ifdef MODULE
979
980
981
982 char kernel_version[] = UTS_RELEASE;
983
984 static struct file_system_type sysv_fs_type[3] = {
985 {sysv_read_super, "xenix", 1, NULL},
986 {sysv_read_super, "sysv", 1, NULL},
987 {sysv_read_super, "coherent", 1, NULL}
988 };
989
990 int init_module(void)
991 {
992 int i;
993
994 for (i = 0; i < 3; i++)
995 register_filesystem(&sysv_fs_type[i]);
996
997 return 0;
998 }
999
1000 void cleanup_module(void)
1001 {
1002 int i;
1003
1004 for (i = 0; i < 3; i++)
1005 unregister_filesystem(&sysv_fs_type[i]);
1006 }
1007
1008 #endif