This source file includes following definitions.
- minix_put_inode
- minix_put_super
- minix_read_super
- minix_statfs
- block_bmap
- minix_bmap
- inode_getblk
- block_getblk
- minix_getblk
- minix_bread
- minix_read_inode
- minix_write_inode
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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
18 void minix_put_inode(struct inode *inode)
19 {
20 if (inode->i_nlink)
21 return;
22 inode->i_size = 0;
23 minix_truncate(inode);
24 minix_free_inode(inode);
25 }
26
27 void minix_put_super(struct super_block *sb)
28 {
29 int i;
30
31 lock_super(sb);
32 sb->s_dev = 0;
33 for(i = 0 ; i < MINIX_I_MAP_SLOTS ; i++)
34 brelse(sb->u.minix_sb.s_imap[i]);
35 for(i = 0 ; i < MINIX_Z_MAP_SLOTS ; i++)
36 brelse(sb->u.minix_sb.s_zmap[i]);
37 unlock_super(sb);
38 return;
39 }
40
41 static struct super_operations minix_sops = {
42 minix_read_inode,
43 NULL,
44 minix_write_inode,
45 minix_put_inode,
46 minix_put_super,
47 NULL,
48 minix_statfs
49 };
50
51 struct super_block *minix_read_super(struct super_block *s,void *data)
52 {
53 struct buffer_head *bh;
54 struct minix_super_block *ms;
55 int i,dev=s->s_dev,block;
56
57 if (32 != sizeof (struct minix_inode))
58 panic("bad i-node size");
59 lock_super(s);
60 if (!(bh = bread(dev,1,BLOCK_SIZE))) {
61 s->s_dev=0;
62 unlock_super(s);
63 printk("MINIX-fs: unable to read superblock\n");
64 return NULL;
65 }
66 ms = (struct minix_super_block *) bh->b_data;
67 s->s_blocksize = 1024;
68 s->u.minix_sb.s_ninodes = ms->s_ninodes;
69 s->u.minix_sb.s_nzones = ms->s_nzones;
70 s->u.minix_sb.s_imap_blocks = ms->s_imap_blocks;
71 s->u.minix_sb.s_zmap_blocks = ms->s_zmap_blocks;
72 s->u.minix_sb.s_firstdatazone = ms->s_firstdatazone;
73 s->u.minix_sb.s_log_zone_size = ms->s_log_zone_size;
74 s->u.minix_sb.s_max_size = ms->s_max_size;
75 s->s_magic = ms->s_magic;
76 brelse(bh);
77 if (s->s_magic != MINIX_SUPER_MAGIC) {
78 s->s_dev = 0;
79 unlock_super(s);
80 printk("MINIX-fs magic match failed\n");
81 return NULL;
82 }
83 for (i=0;i < MINIX_I_MAP_SLOTS;i++)
84 s->u.minix_sb.s_imap[i] = NULL;
85 for (i=0;i < MINIX_Z_MAP_SLOTS;i++)
86 s->u.minix_sb.s_zmap[i] = NULL;
87 block=2;
88 for (i=0 ; i < s->u.minix_sb.s_imap_blocks ; i++)
89 if ((s->u.minix_sb.s_imap[i]=bread(dev,block,BLOCK_SIZE)) != NULL)
90 block++;
91 else
92 break;
93 for (i=0 ; i < s->u.minix_sb.s_zmap_blocks ; i++)
94 if ((s->u.minix_sb.s_zmap[i]=bread(dev,block,BLOCK_SIZE)) != NULL)
95 block++;
96 else
97 break;
98 if (block != 2+s->u.minix_sb.s_imap_blocks+s->u.minix_sb.s_zmap_blocks) {
99 for(i=0;i<MINIX_I_MAP_SLOTS;i++)
100 brelse(s->u.minix_sb.s_imap[i]);
101 for(i=0;i<MINIX_Z_MAP_SLOTS;i++)
102 brelse(s->u.minix_sb.s_zmap[i]);
103 s->s_dev=0;
104 unlock_super(s);
105 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
106 return NULL;
107 }
108 s->u.minix_sb.s_imap[0]->b_data[0] |= 1;
109 s->u.minix_sb.s_zmap[0]->b_data[0] |= 1;
110
111 s->s_dev = dev;
112 s->s_op = &minix_sops;
113 s->s_mounted = iget(s,MINIX_ROOT_INO);
114 unlock_super(s);
115 if (!s->s_mounted) {
116 s->s_dev = 0;
117 printk("MINIX-fs: get root inode failed\n");
118 return NULL;
119 }
120 return s;
121 }
122
123 void minix_statfs(struct super_block *sb, struct statfs *buf)
124 {
125 long tmp;
126
127 put_fs_long(MINIX_SUPER_MAGIC, &buf->f_type);
128 put_fs_long(1024, &buf->f_bsize);
129 put_fs_long(sb->u.minix_sb.s_nzones << sb->u.minix_sb.s_log_zone_size, &buf->f_blocks);
130 tmp = minix_count_free_blocks(sb);
131 put_fs_long(tmp, &buf->f_bfree);
132 put_fs_long(tmp, &buf->f_bavail);
133 put_fs_long(sb->u.minix_sb.s_ninodes, &buf->f_files);
134 put_fs_long(minix_count_free_inodes(sb), &buf->f_ffree);
135
136 }
137
138 #define inode_bmap(inode,nr) ((inode)->u.minix_i.i_data[(nr)])
139
140 static int block_bmap(struct buffer_head * bh, int nr)
141 {
142 int tmp;
143
144 if (!bh)
145 return 0;
146 tmp = ((unsigned short *) bh->b_data)[nr];
147 brelse(bh);
148 return tmp;
149 }
150
151 int minix_bmap(struct inode * inode,int block)
152 {
153 int i;
154
155 if (block<0) {
156 printk("minix_bmap: block<0");
157 return 0;
158 }
159 if (block >= 7+512+512*512) {
160 printk("minix_bmap: block>big");
161 return 0;
162 }
163 if (block < 7)
164 return inode_bmap(inode,block);
165 block -= 7;
166 if (block < 512) {
167 i = inode_bmap(inode,7);
168 if (!i)
169 return 0;
170 return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block);
171 }
172 block -= 512;
173 i = inode_bmap(inode,8);
174 if (!i)
175 return 0;
176 i = block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block>>9);
177 if (!i)
178 return 0;
179 return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block & 511);
180 }
181
182 static struct buffer_head * inode_getblk(struct inode * inode, int nr, int create)
183 {
184 int tmp;
185 unsigned short *p;
186 struct buffer_head * result;
187
188 p = inode->u.minix_i.i_data + nr;
189 repeat:
190 tmp = *p;
191 if (tmp) {
192 result = getblk(inode->i_dev, tmp, BLOCK_SIZE);
193 if (tmp == *p)
194 return result;
195 brelse(result);
196 goto repeat;
197 }
198 if (!create)
199 return NULL;
200 tmp = minix_new_block(inode->i_sb);
201 if (!tmp)
202 return NULL;
203 result = getblk(inode->i_dev, tmp, BLOCK_SIZE);
204 if (*p) {
205 minix_free_block(inode->i_sb,tmp);
206 brelse(result);
207 goto repeat;
208 }
209 *p = tmp;
210 inode->i_ctime = CURRENT_TIME;
211 inode->i_dirt = 1;
212 return result;
213 }
214
215 static struct buffer_head * block_getblk(struct inode * inode,
216 struct buffer_head * bh, int nr, int create)
217 {
218 int tmp;
219 unsigned short *p;
220 struct buffer_head * result;
221
222 if (!bh)
223 return NULL;
224 if (!bh->b_uptodate) {
225 ll_rw_block(READ, 1, &bh);
226 wait_on_buffer(bh);
227 if (!bh->b_uptodate) {
228 brelse(bh);
229 return NULL;
230 }
231 }
232 p = nr + (unsigned short *) bh->b_data;
233 repeat:
234 tmp = *p;
235 if (tmp) {
236 result = getblk(bh->b_dev, tmp, BLOCK_SIZE);
237 if (tmp == *p) {
238 brelse(bh);
239 return result;
240 }
241 brelse(result);
242 goto repeat;
243 }
244 if (!create) {
245 brelse(bh);
246 return NULL;
247 }
248 tmp = minix_new_block(inode->i_sb);
249 if (!tmp) {
250 brelse(bh);
251 return NULL;
252 }
253 result = getblk(bh->b_dev, tmp, BLOCK_SIZE);
254 if (*p) {
255 minix_free_block(inode->i_sb,tmp);
256 brelse(result);
257 goto repeat;
258 }
259 *p = tmp;
260 bh->b_dirt = 1;
261 brelse(bh);
262 return result;
263 }
264
265 struct buffer_head * minix_getblk(struct inode * inode, int block, int create)
266 {
267 struct buffer_head * bh;
268
269 if (block<0) {
270 printk("minix_getblk: block<0");
271 return NULL;
272 }
273 if (block >= 7+512+512*512) {
274 printk("minix_getblk: block>big");
275 return NULL;
276 }
277 if (block < 7)
278 return inode_getblk(inode,block,create);
279 block -= 7;
280 if (block < 512) {
281 bh = inode_getblk(inode,7,create);
282 return block_getblk(inode, bh, block, create);
283 }
284 block -= 512;
285 bh = inode_getblk(inode,8,create);
286 bh = block_getblk(inode, bh, block>>9, create);
287 return block_getblk(inode, bh, block & 511, create);
288 }
289
290 struct buffer_head * minix_bread(struct inode * inode, int block, int create)
291 {
292 struct buffer_head * bh;
293
294 bh = minix_getblk(inode,block,create);
295 if (!bh || bh->b_uptodate)
296 return bh;
297 ll_rw_block(READ, 1, &bh);
298 wait_on_buffer(bh);
299 if (bh->b_uptodate)
300 return bh;
301 brelse(bh);
302 return NULL;
303 }
304
305 void minix_read_inode(struct inode * inode)
306 {
307 struct buffer_head * bh;
308 struct minix_inode * raw_inode;
309 int block, ino;
310
311 ino = inode->i_ino;
312 block = 2 + inode->i_sb->u.minix_sb.s_imap_blocks +
313 inode->i_sb->u.minix_sb.s_zmap_blocks +
314 (ino-1)/MINIX_INODES_PER_BLOCK;
315 if (!(bh=bread(inode->i_dev,block, BLOCK_SIZE)))
316 panic("unable to read i-node block");
317 raw_inode = ((struct minix_inode *) bh->b_data) +
318 (ino-1)%MINIX_INODES_PER_BLOCK;
319 inode->i_mode = raw_inode->i_mode;
320 inode->i_uid = raw_inode->i_uid;
321 inode->i_gid = raw_inode->i_gid;
322 inode->i_nlink = raw_inode->i_nlinks;
323 inode->i_size = raw_inode->i_size;
324 inode->i_mtime = inode->i_atime = inode->i_ctime = raw_inode->i_time;
325 inode->i_blocks = inode->i_blksize = 0;
326 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
327 inode->i_rdev = raw_inode->i_zone[0];
328 else for (block = 0; block < 9; block++)
329 inode->u.minix_i.i_data[block] = raw_inode->i_zone[block];
330 brelse(bh);
331 inode->i_op = NULL;
332 if (S_ISREG(inode->i_mode))
333 inode->i_op = &minix_file_inode_operations;
334 else if (S_ISDIR(inode->i_mode))
335 inode->i_op = &minix_dir_inode_operations;
336 else if (S_ISLNK(inode->i_mode))
337 inode->i_op = &minix_symlink_inode_operations;
338 else if (S_ISCHR(inode->i_mode))
339 inode->i_op = &minix_chrdev_inode_operations;
340 else if (S_ISBLK(inode->i_mode))
341 inode->i_op = &minix_blkdev_inode_operations;
342 else if (S_ISFIFO(inode->i_mode)) {
343 inode->i_op = &minix_fifo_inode_operations;
344 inode->i_pipe = 1;
345 PIPE_BASE(*inode) = NULL;
346 PIPE_HEAD(*inode) = PIPE_TAIL(*inode) = 0;
347 PIPE_READ_WAIT(*inode) = PIPE_WRITE_WAIT(*inode) = NULL;
348 PIPE_READERS(*inode) = PIPE_WRITERS(*inode) = 0;
349 }
350 }
351
352 void minix_write_inode(struct inode * inode)
353 {
354 struct buffer_head * bh;
355 struct minix_inode * raw_inode;
356 int block;
357
358 block = 2 + inode->i_sb->u.minix_sb.s_imap_blocks + inode->i_sb->u.minix_sb.s_zmap_blocks +
359 (inode->i_ino-1)/MINIX_INODES_PER_BLOCK;
360 if (!(bh=bread(inode->i_dev, block, BLOCK_SIZE)))
361 panic("unable to read i-node block");
362 raw_inode = ((struct minix_inode *)bh->b_data) +
363 (inode->i_ino-1)%MINIX_INODES_PER_BLOCK;
364 raw_inode->i_mode = inode->i_mode;
365 raw_inode->i_uid = inode->i_uid;
366 raw_inode->i_gid = inode->i_gid;
367 raw_inode->i_nlinks = inode->i_nlink;
368 raw_inode->i_size = inode->i_size;
369 raw_inode->i_time = inode->i_mtime;
370 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
371 raw_inode->i_zone[0] = inode->i_rdev;
372 else for (block = 0; block < 9; block++)
373 raw_inode->i_zone[block] = inode->u.minix_i.i_data[block];
374 inode->i_dirt=0;
375 bh->b_dirt=1;
376 brelse(bh);
377 }