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
- block_bmap
- minix_bmap
- inode_getblk
- block_getblk
- minix_getblk
- minix_bread
- minix_read_inode
- minix_update_inode
- minix_write_inode
- minix_sync_inode
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5
6
7 #include <linux/sched.h>
8 #include <linux/minix_fs.h>
9 #include <linux/kernel.h>
10 #include <linux/mm.h>
11 #include <linux/string.h>
12 #include <linux/stat.h>
13 #include <linux/locks.h>
14
15 #include <asm/system.h>
16 #include <asm/segment.h>
17 #include <asm/bitops.h>
18
19 void minix_put_inode(struct inode *inode)
20 {
21 if (inode->i_nlink)
22 return;
23 inode->i_size = 0;
24 minix_truncate(inode);
25 minix_free_inode(inode);
26 }
27
28 static void minix_commit_super (struct super_block * sb,
29 struct minix_super_block * ms)
30 {
31 mark_buffer_dirty(sb->u.minix_sb.s_sbh, 1);
32 sb->s_dirt = 0;
33 }
34
35 void minix_write_super (struct super_block * sb)
36 {
37 struct minix_super_block * ms;
38
39 if (!(sb->s_flags & MS_RDONLY)) {
40 ms = sb->u.minix_sb.s_ms;
41
42 if (ms->s_state & MINIX_VALID_FS)
43 ms->s_state &= ~MINIX_VALID_FS;
44 minix_commit_super (sb, ms);
45 }
46 sb->s_dirt = 0;
47 }
48
49
50 void minix_put_super(struct super_block *sb)
51 {
52 int i;
53
54 lock_super(sb);
55 if (!(sb->s_flags & MS_RDONLY)) {
56 sb->u.minix_sb.s_ms->s_state = sb->u.minix_sb.s_mount_state;
57 mark_buffer_dirty(sb->u.minix_sb.s_sbh, 1);
58 }
59 sb->s_dev = 0;
60 for(i = 0 ; i < MINIX_I_MAP_SLOTS ; i++)
61 brelse(sb->u.minix_sb.s_imap[i]);
62 for(i = 0 ; i < MINIX_Z_MAP_SLOTS ; i++)
63 brelse(sb->u.minix_sb.s_zmap[i]);
64 brelse (sb->u.minix_sb.s_sbh);
65 unlock_super(sb);
66 return;
67 }
68
69 static struct super_operations minix_sops = {
70 minix_read_inode,
71 NULL,
72 minix_write_inode,
73 minix_put_inode,
74 minix_put_super,
75 minix_write_super,
76 minix_statfs,
77 minix_remount
78 };
79
80 int minix_remount (struct super_block * sb, int * flags, char * data)
81 {
82 struct minix_super_block * ms;
83
84 ms = sb->u.minix_sb.s_ms;
85 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
86 return 0;
87 if (*flags & MS_RDONLY) {
88 if (ms->s_state & MINIX_VALID_FS ||
89 !(sb->u.minix_sb.s_mount_state & MINIX_VALID_FS))
90 return 0;
91
92 ms->s_state = sb->u.minix_sb.s_mount_state;
93 mark_buffer_dirty(sb->u.minix_sb.s_sbh, 1);
94 sb->s_dirt = 1;
95 minix_commit_super (sb, ms);
96 }
97 else {
98
99 sb->u.minix_sb.s_mount_state = ms->s_state;
100 ms->s_state &= ~MINIX_VALID_FS;
101 mark_buffer_dirty(sb->u.minix_sb.s_sbh, 1);
102 sb->s_dirt = 1;
103
104 if (!(sb->u.minix_sb.s_mount_state & MINIX_VALID_FS))
105 printk ("MINIX-fs warning: remounting unchecked fs, "
106 "running fsck is recommended.\n");
107 else if ((sb->u.minix_sb.s_mount_state & MINIX_ERROR_FS))
108 printk ("MINIX-fs warning: remounting fs with errors, "
109 "running fsck is recommended.\n");
110 }
111 return 0;
112 }
113
114
115 struct super_block *minix_read_super(struct super_block *s,void *data,
116 int silent)
117 {
118 struct buffer_head *bh;
119 struct minix_super_block *ms;
120 int i,dev=s->s_dev,block;
121
122 if (32 != sizeof (struct minix_inode))
123 panic("bad i-node size");
124 lock_super(s);
125 set_blocksize(dev, BLOCK_SIZE);
126 if (!(bh = bread(dev,1,BLOCK_SIZE))) {
127 s->s_dev=0;
128 unlock_super(s);
129 printk("MINIX-fs: unable to read superblock\n");
130 return NULL;
131 }
132 ms = (struct minix_super_block *) bh->b_data;
133 s->u.minix_sb.s_ms = ms;
134 s->u.minix_sb.s_sbh = bh;
135 s->u.minix_sb.s_mount_state = ms->s_state;
136 s->s_blocksize = 1024;
137 s->s_blocksize_bits = 10;
138 s->u.minix_sb.s_ninodes = ms->s_ninodes;
139 s->u.minix_sb.s_nzones = ms->s_nzones;
140 s->u.minix_sb.s_imap_blocks = ms->s_imap_blocks;
141 s->u.minix_sb.s_zmap_blocks = ms->s_zmap_blocks;
142 s->u.minix_sb.s_firstdatazone = ms->s_firstdatazone;
143 s->u.minix_sb.s_log_zone_size = ms->s_log_zone_size;
144 s->u.minix_sb.s_max_size = ms->s_max_size;
145 s->s_magic = ms->s_magic;
146 if (s->s_magic == MINIX_SUPER_MAGIC) {
147 s->u.minix_sb.s_dirsize = 16;
148 s->u.minix_sb.s_namelen = 14;
149 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
150 s->u.minix_sb.s_dirsize = 32;
151 s->u.minix_sb.s_namelen = 30;
152 } else {
153 s->s_dev = 0;
154 unlock_super(s);
155 brelse(bh);
156 if (!silent)
157 printk("VFS: Can't find a minix filesystem on dev 0x%04x.\n", dev);
158 return NULL;
159 }
160 for (i=0;i < MINIX_I_MAP_SLOTS;i++)
161 s->u.minix_sb.s_imap[i] = NULL;
162 for (i=0;i < MINIX_Z_MAP_SLOTS;i++)
163 s->u.minix_sb.s_zmap[i] = NULL;
164 block=2;
165 for (i=0 ; i < s->u.minix_sb.s_imap_blocks ; i++)
166 if ((s->u.minix_sb.s_imap[i]=bread(dev,block,BLOCK_SIZE)) != NULL)
167 block++;
168 else
169 break;
170 for (i=0 ; i < s->u.minix_sb.s_zmap_blocks ; i++)
171 if ((s->u.minix_sb.s_zmap[i]=bread(dev,block,BLOCK_SIZE)) != NULL)
172 block++;
173 else
174 break;
175 if (block != 2+s->u.minix_sb.s_imap_blocks+s->u.minix_sb.s_zmap_blocks) {
176 for(i=0;i<MINIX_I_MAP_SLOTS;i++)
177 brelse(s->u.minix_sb.s_imap[i]);
178 for(i=0;i<MINIX_Z_MAP_SLOTS;i++)
179 brelse(s->u.minix_sb.s_zmap[i]);
180 s->s_dev=0;
181 unlock_super(s);
182 brelse(bh);
183 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
184 return NULL;
185 }
186 set_bit(0,s->u.minix_sb.s_imap[0]->b_data);
187 set_bit(0,s->u.minix_sb.s_zmap[0]->b_data);
188 unlock_super(s);
189
190 s->s_dev = dev;
191 s->s_op = &minix_sops;
192 s->s_mounted = iget(s,MINIX_ROOT_INO);
193 if (!s->s_mounted) {
194 s->s_dev = 0;
195 brelse(bh);
196 printk("MINIX-fs: get root inode failed\n");
197 return NULL;
198 }
199 if (!(s->s_flags & MS_RDONLY)) {
200 ms->s_state &= ~MINIX_VALID_FS;
201 mark_buffer_dirty(bh, 1);
202 s->s_dirt = 1;
203 }
204 if (!(s->u.minix_sb.s_mount_state & MINIX_VALID_FS))
205 printk ("MINIX-fs: mounting unchecked file system, "
206 "running fsck is recommended.\n");
207 else if (s->u.minix_sb.s_mount_state & MINIX_ERROR_FS)
208 printk ("MINIX-fs: mounting file system with errors, "
209 "running fsck is recommended.\n");
210 return s;
211 }
212
213 void minix_statfs(struct super_block *sb, struct statfs *buf)
214 {
215 long tmp;
216
217 put_fs_long(MINIX_SUPER_MAGIC, &buf->f_type);
218 put_fs_long(1024, &buf->f_bsize);
219 tmp = sb->u.minix_sb.s_nzones - sb->u.minix_sb.s_firstdatazone;
220 tmp <<= sb->u.minix_sb.s_log_zone_size;
221 put_fs_long(tmp, &buf->f_blocks);
222 tmp = minix_count_free_blocks(sb);
223 put_fs_long(tmp, &buf->f_bfree);
224 put_fs_long(tmp, &buf->f_bavail);
225 put_fs_long(sb->u.minix_sb.s_ninodes, &buf->f_files);
226 put_fs_long(minix_count_free_inodes(sb), &buf->f_ffree);
227 put_fs_long(sb->u.minix_sb.s_namelen, &buf->f_namelen);
228
229 }
230
231 #define inode_bmap(inode,nr) ((inode)->u.minix_i.i_data[(nr)])
232
233 static int block_bmap(struct buffer_head * bh, int nr)
234 {
235 int tmp;
236
237 if (!bh)
238 return 0;
239 tmp = ((unsigned short *) bh->b_data)[nr];
240 brelse(bh);
241 return tmp;
242 }
243
244 int minix_bmap(struct inode * inode,int block)
245 {
246 int i;
247
248 if (block<0) {
249 printk("minix_bmap: block<0");
250 return 0;
251 }
252 if (block >= 7+512+512*512) {
253 printk("minix_bmap: block>big");
254 return 0;
255 }
256 if (block < 7)
257 return inode_bmap(inode,block);
258 block -= 7;
259 if (block < 512) {
260 i = inode_bmap(inode,7);
261 if (!i)
262 return 0;
263 return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block);
264 }
265 block -= 512;
266 i = inode_bmap(inode,8);
267 if (!i)
268 return 0;
269 i = block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block>>9);
270 if (!i)
271 return 0;
272 return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block & 511);
273 }
274
275 static struct buffer_head * inode_getblk(struct inode * inode, int nr, int create)
276 {
277 int tmp;
278 unsigned short *p;
279 struct buffer_head * result;
280
281 p = inode->u.minix_i.i_data + nr;
282 repeat:
283 tmp = *p;
284 if (tmp) {
285 result = getblk(inode->i_dev, tmp, BLOCK_SIZE);
286 if (tmp == *p)
287 return result;
288 brelse(result);
289 goto repeat;
290 }
291 if (!create)
292 return NULL;
293 tmp = minix_new_block(inode->i_sb);
294 if (!tmp)
295 return NULL;
296 result = getblk(inode->i_dev, tmp, BLOCK_SIZE);
297 if (*p) {
298 minix_free_block(inode->i_sb,tmp);
299 brelse(result);
300 goto repeat;
301 }
302 *p = tmp;
303 inode->i_ctime = CURRENT_TIME;
304 inode->i_dirt = 1;
305 return result;
306 }
307
308 static struct buffer_head * block_getblk(struct inode * inode,
309 struct buffer_head * bh, int nr, int create)
310 {
311 int tmp;
312 unsigned short *p;
313 struct buffer_head * result;
314
315 if (!bh)
316 return NULL;
317 if (!bh->b_uptodate) {
318 ll_rw_block(READ, 1, &bh);
319 wait_on_buffer(bh);
320 if (!bh->b_uptodate) {
321 brelse(bh);
322 return NULL;
323 }
324 }
325 p = nr + (unsigned short *) bh->b_data;
326 repeat:
327 tmp = *p;
328 if (tmp) {
329 result = getblk(bh->b_dev, tmp, BLOCK_SIZE);
330 if (tmp == *p) {
331 brelse(bh);
332 return result;
333 }
334 brelse(result);
335 goto repeat;
336 }
337 if (!create) {
338 brelse(bh);
339 return NULL;
340 }
341 tmp = minix_new_block(inode->i_sb);
342 if (!tmp) {
343 brelse(bh);
344 return NULL;
345 }
346 result = getblk(bh->b_dev, tmp, BLOCK_SIZE);
347 if (*p) {
348 minix_free_block(inode->i_sb,tmp);
349 brelse(result);
350 goto repeat;
351 }
352 *p = tmp;
353 mark_buffer_dirty(bh, 1);
354 brelse(bh);
355 return result;
356 }
357
358 struct buffer_head * minix_getblk(struct inode * inode, int block, int create)
359 {
360 struct buffer_head * bh;
361
362 if (block<0) {
363 printk("minix_getblk: block<0");
364 return NULL;
365 }
366 if (block >= 7+512+512*512) {
367 printk("minix_getblk: block>big");
368 return NULL;
369 }
370 if (block < 7)
371 return inode_getblk(inode,block,create);
372 block -= 7;
373 if (block < 512) {
374 bh = inode_getblk(inode,7,create);
375 return block_getblk(inode, bh, block, create);
376 }
377 block -= 512;
378 bh = inode_getblk(inode,8,create);
379 bh = block_getblk(inode, bh, block>>9, create);
380 return block_getblk(inode, bh, block & 511, create);
381 }
382
383 struct buffer_head * minix_bread(struct inode * inode, int block, int create)
384 {
385 struct buffer_head * bh;
386
387 bh = minix_getblk(inode,block,create);
388 if (!bh || bh->b_uptodate)
389 return bh;
390 ll_rw_block(READ, 1, &bh);
391 wait_on_buffer(bh);
392 if (bh->b_uptodate)
393 return bh;
394 brelse(bh);
395 return NULL;
396 }
397
398 void minix_read_inode(struct inode * inode)
399 {
400 struct buffer_head * bh;
401 struct minix_inode * raw_inode;
402 int block, ino;
403
404 ino = inode->i_ino;
405 inode->i_op = NULL;
406 inode->i_mode = 0;
407 if (!ino || ino >= inode->i_sb->u.minix_sb.s_ninodes) {
408 printk("Bad inode number on dev 0x%04x: %d is out of range\n",
409 inode->i_dev, ino);
410 return;
411 }
412 block = 2 + inode->i_sb->u.minix_sb.s_imap_blocks +
413 inode->i_sb->u.minix_sb.s_zmap_blocks +
414 (ino-1)/MINIX_INODES_PER_BLOCK;
415 if (!(bh=bread(inode->i_dev,block, BLOCK_SIZE))) {
416 printk("Major problem: unable to read inode from dev 0x%04x\n",
417 inode->i_dev);
418 return;
419 }
420 raw_inode = ((struct minix_inode *) bh->b_data) +
421 (ino-1)%MINIX_INODES_PER_BLOCK;
422 inode->i_mode = raw_inode->i_mode;
423 inode->i_uid = raw_inode->i_uid;
424 inode->i_gid = raw_inode->i_gid;
425 inode->i_nlink = raw_inode->i_nlinks;
426 inode->i_size = raw_inode->i_size;
427 inode->i_mtime = inode->i_atime = inode->i_ctime = raw_inode->i_time;
428 inode->i_blocks = inode->i_blksize = 0;
429 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
430 inode->i_rdev = raw_inode->i_zone[0];
431 else for (block = 0; block < 9; block++)
432 inode->u.minix_i.i_data[block] = raw_inode->i_zone[block];
433 brelse(bh);
434 if (S_ISREG(inode->i_mode))
435 inode->i_op = &minix_file_inode_operations;
436 else if (S_ISDIR(inode->i_mode))
437 inode->i_op = &minix_dir_inode_operations;
438 else if (S_ISLNK(inode->i_mode))
439 inode->i_op = &minix_symlink_inode_operations;
440 else if (S_ISCHR(inode->i_mode))
441 inode->i_op = &chrdev_inode_operations;
442 else if (S_ISBLK(inode->i_mode))
443 inode->i_op = &blkdev_inode_operations;
444 else if (S_ISFIFO(inode->i_mode))
445 init_fifo(inode);
446 }
447
448 static struct buffer_head * minix_update_inode(struct inode * inode)
449 {
450 struct buffer_head * bh;
451 struct minix_inode * raw_inode;
452 int ino, block;
453
454 ino = inode->i_ino;
455 if (!ino || ino >= inode->i_sb->u.minix_sb.s_ninodes) {
456 printk("Bad inode number on dev 0x%04x: %d is out of range\n",
457 inode->i_dev, ino);
458 inode->i_dirt = 0;
459 return 0;
460 }
461 block = 2 + inode->i_sb->u.minix_sb.s_imap_blocks + inode->i_sb->u.minix_sb.s_zmap_blocks +
462 (ino-1)/MINIX_INODES_PER_BLOCK;
463 if (!(bh=bread(inode->i_dev, block, BLOCK_SIZE))) {
464 printk("unable to read i-node block\n");
465 inode->i_dirt = 0;
466 return 0;
467 }
468 raw_inode = ((struct minix_inode *)bh->b_data) +
469 (ino-1)%MINIX_INODES_PER_BLOCK;
470 raw_inode->i_mode = inode->i_mode;
471 raw_inode->i_uid = inode->i_uid;
472 raw_inode->i_gid = inode->i_gid;
473 raw_inode->i_nlinks = inode->i_nlink;
474 raw_inode->i_size = inode->i_size;
475 raw_inode->i_time = inode->i_mtime;
476 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
477 raw_inode->i_zone[0] = inode->i_rdev;
478 else for (block = 0; block < 9; block++)
479 raw_inode->i_zone[block] = inode->u.minix_i.i_data[block];
480 inode->i_dirt=0;
481 mark_buffer_dirty(bh, 1);
482 return bh;
483 }
484
485 void minix_write_inode(struct inode * inode)
486 {
487 struct buffer_head *bh;
488 bh = minix_update_inode(inode);
489 brelse(bh);
490 }
491
492 int minix_sync_inode(struct inode * inode)
493 {
494 int err = 0;
495 struct buffer_head *bh;
496
497 bh = minix_update_inode(inode);
498 if (bh && bh->b_dirt)
499 {
500 ll_rw_block(WRITE, 1, &bh);
501 wait_on_buffer(bh);
502 if (bh->b_req && !bh->b_uptodate)
503 {
504 printk ("IO error syncing minix inode [%04x:%08lx]\n",
505 inode->i_dev, inode->i_ino);
506 err = -1;
507 }
508 }
509 else if (!bh)
510 err = -1;
511 brelse (bh);
512 return err;
513 }