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