This source file includes following definitions.
- ext_put_inode
- ext_put_super
- ext_read_super
- ext_write_super
- ext_statfs
- block_bmap
- ext_bmap
- inode_getblk
- block_getblk
- ext_getblk
- ext_bread
- ext_read_inode
- ext_write_inode
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13 #include <linux/sched.h>
14 #include <linux/ext_fs.h>
15 #include <linux/kernel.h>
16 #include <linux/mm.h>
17 #include <linux/string.h>
18 #include <linux/stat.h>
19 #include <linux/locks.h>
20
21 #include <asm/system.h>
22 #include <asm/segment.h>
23
24 void ext_put_inode(struct inode *inode)
25 {
26 if (inode->i_nlink)
27 return;
28 inode->i_size = 0;
29 ext_truncate(inode);
30 ext_free_inode(inode);
31 }
32
33 void ext_put_super(struct super_block *sb)
34 {
35
36 lock_super(sb);
37 sb->s_dev = 0;
38 if (sb->u.ext_sb.s_firstfreeinodeblock)
39 brelse (sb->u.ext_sb.s_firstfreeinodeblock);
40 if (sb->u.ext_sb.s_firstfreeblock)
41 brelse (sb->u.ext_sb.s_firstfreeblock);
42 unlock_super(sb);
43 return;
44 }
45
46 static struct super_operations ext_sops = {
47 ext_read_inode,
48 NULL,
49 ext_write_inode,
50 ext_put_inode,
51 ext_put_super,
52 ext_write_super,
53 ext_statfs
54 };
55
56 struct super_block *ext_read_super(struct super_block *s,void *data,
57 int silent)
58 {
59 struct buffer_head *bh;
60 struct ext_super_block *es;
61 int dev = s->s_dev,block;
62
63 lock_super(s);
64 if (!(bh = bread(dev, 1, BLOCK_SIZE))) {
65 s->s_dev=0;
66 unlock_super(s);
67 printk("EXT-fs: unable to read superblock\n");
68 return NULL;
69 }
70 es = (struct ext_super_block *) bh->b_data;
71 s->s_blocksize = 1024;
72 s->u.ext_sb.s_ninodes = es->s_ninodes;
73 s->u.ext_sb.s_nzones = es->s_nzones;
74 s->u.ext_sb.s_firstdatazone = es->s_firstdatazone;
75 s->u.ext_sb.s_log_zone_size = es->s_log_zone_size;
76 s->u.ext_sb.s_max_size = es->s_max_size;
77 s->s_magic = es->s_magic;
78 s->u.ext_sb.s_firstfreeblocknumber = es->s_firstfreeblock;
79 s->u.ext_sb.s_freeblockscount = es->s_freeblockscount;
80 s->u.ext_sb.s_firstfreeinodenumber = es->s_firstfreeinode;
81 s->u.ext_sb.s_freeinodescount = es->s_freeinodescount;
82 brelse(bh);
83 if (s->s_magic != EXT_SUPER_MAGIC) {
84 s->s_dev = 0;
85 unlock_super(s);
86 if (!silent)
87 printk("VFS: Can't find an extfs filesystem on dev 0x%04x.\n",
88 dev);
89 return NULL;
90 }
91 if (!s->u.ext_sb.s_firstfreeblocknumber)
92 s->u.ext_sb.s_firstfreeblock = NULL;
93 else
94 if (!(s->u.ext_sb.s_firstfreeblock = bread(dev,
95 s->u.ext_sb.s_firstfreeblocknumber, BLOCK_SIZE))) {
96 printk("ext_read_super: unable to read first free block\n");
97 s->s_dev = 0;
98 unlock_super(s);
99 return NULL;
100 }
101 if (!s->u.ext_sb.s_firstfreeinodenumber)
102 s->u.ext_sb.s_firstfreeinodeblock = NULL;
103 else {
104 block = 2 + (s->u.ext_sb.s_firstfreeinodenumber - 1) / EXT_INODES_PER_BLOCK;
105 if (!(s->u.ext_sb.s_firstfreeinodeblock = bread(dev, block, BLOCK_SIZE))) {
106 printk("ext_read_super: unable to read first free inode block\n");
107 brelse(s->u.ext_sb.s_firstfreeblock);
108 s->s_dev = 0;
109 unlock_super (s);
110 return NULL;
111 }
112 }
113 unlock_super(s);
114
115 s->s_dev = dev;
116 s->s_op = &ext_sops;
117 if (!(s->s_mounted = iget(s,EXT_ROOT_INO))) {
118 s->s_dev=0;
119 printk("EXT-fs: get root inode failed\n");
120 return NULL;
121 }
122 return s;
123 }
124
125 void ext_write_super (struct super_block *sb)
126 {
127 struct buffer_head * bh;
128 struct ext_super_block * es;
129
130 if (!(bh = bread(sb->s_dev, 1, BLOCK_SIZE))) {
131 printk ("ext_write_super: bread failed\n");
132 return;
133 }
134 es = (struct ext_super_block *) bh->b_data;
135 es->s_firstfreeblock = sb->u.ext_sb.s_firstfreeblocknumber;
136 es->s_freeblockscount = sb->u.ext_sb.s_freeblockscount;
137 es->s_firstfreeinode = sb->u.ext_sb.s_firstfreeinodenumber;
138 es->s_freeinodescount = sb->u.ext_sb.s_freeinodescount;
139 bh->b_dirt = 1;
140 brelse (bh);
141 sb->s_dirt = 0;
142 }
143
144 void ext_statfs (struct super_block *sb, struct statfs *buf)
145 {
146 long tmp;
147
148 put_fs_long(EXT_SUPER_MAGIC, &buf->f_type);
149 put_fs_long(1024, &buf->f_bsize);
150 put_fs_long(sb->u.ext_sb.s_nzones << sb->u.ext_sb.s_log_zone_size,
151 &buf->f_blocks);
152 tmp = ext_count_free_blocks(sb);
153 put_fs_long(tmp, &buf->f_bfree);
154 put_fs_long(tmp, &buf->f_bavail);
155 put_fs_long(sb->u.ext_sb.s_ninodes, &buf->f_files);
156 put_fs_long(ext_count_free_inodes(sb), &buf->f_ffree);
157 put_fs_long(EXT_NAME_LEN, &buf->f_namelen);
158
159 }
160
161 #define inode_bmap(inode,nr) ((inode)->u.ext_i.i_data[(nr)])
162
163 static int block_bmap(struct buffer_head * bh, int nr)
164 {
165 int tmp;
166
167 if (!bh)
168 return 0;
169 tmp = ((unsigned long *) bh->b_data)[nr];
170 brelse(bh);
171 return tmp;
172 }
173
174 int ext_bmap(struct inode * inode,int block)
175 {
176 int i;
177
178 if (block<0) {
179 printk("ext_bmap: block<0");
180 return 0;
181 }
182 if (block >= 9+256+256*256+256*256*256) {
183 printk("ext_bmap: block>big");
184 return 0;
185 }
186 if (block<9)
187 return inode_bmap(inode,block);
188 block -= 9;
189 if (block<256) {
190 i = inode_bmap(inode,9);
191 if (!i)
192 return 0;
193 return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block);
194 }
195 block -= 256;
196 if (block<256*256) {
197 i = inode_bmap(inode,10);
198 if (!i)
199 return 0;
200 i = block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block>>8);
201 if (!i)
202 return 0;
203 return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block & 255);
204 }
205 block -= 256*256;
206 i = inode_bmap(inode,11);
207 if (!i)
208 return 0;
209 i = block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block>>16);
210 if (!i)
211 return 0;
212 i = block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),(block>>8) & 255);
213 if (!i)
214 return 0;
215 return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block & 255);
216 }
217
218 static struct buffer_head * inode_getblk(struct inode * inode, int nr, int create)
219 {
220 int tmp;
221 unsigned long * p;
222 struct buffer_head * result;
223
224 p = inode->u.ext_i.i_data + nr;
225 repeat:
226 tmp = *p;
227 if (tmp) {
228 result = getblk(inode->i_dev, tmp, BLOCK_SIZE);
229 if (tmp == *p)
230 return result;
231 brelse(result);
232 goto repeat;
233 }
234 if (!create)
235 return NULL;
236 tmp = ext_new_block(inode->i_sb);
237 if (!tmp)
238 return NULL;
239 result = getblk(inode->i_dev, tmp, BLOCK_SIZE);
240 if (*p) {
241 ext_free_block(inode->i_sb,tmp);
242 brelse(result);
243 goto repeat;
244 }
245 *p = tmp;
246 inode->i_ctime = CURRENT_TIME;
247 inode->i_dirt = 1;
248 return result;
249 }
250
251 static struct buffer_head * block_getblk(struct inode * inode,
252 struct buffer_head * bh, int nr, int create)
253 {
254 int tmp;
255 unsigned long * p;
256 struct buffer_head * result;
257
258 if (!bh)
259 return NULL;
260 if (!bh->b_uptodate) {
261 ll_rw_block(READ, 1, &bh);
262 wait_on_buffer(bh);
263 if (!bh->b_uptodate) {
264 brelse(bh);
265 return NULL;
266 }
267 }
268 p = nr + (unsigned long *) bh->b_data;
269 repeat:
270 tmp = *p;
271 if (tmp) {
272 result = getblk(bh->b_dev, tmp, BLOCK_SIZE);
273 if (tmp == *p) {
274 brelse(bh);
275 return result;
276 }
277 brelse(result);
278 goto repeat;
279 }
280 if (!create) {
281 brelse(bh);
282 return NULL;
283 }
284 tmp = ext_new_block(inode->i_sb);
285 if (!tmp) {
286 brelse(bh);
287 return NULL;
288 }
289 result = getblk(bh->b_dev, tmp, BLOCK_SIZE);
290 if (*p) {
291 ext_free_block(inode->i_sb,tmp);
292 brelse(result);
293 goto repeat;
294 }
295 *p = tmp;
296 bh->b_dirt = 1;
297 brelse(bh);
298 return result;
299 }
300
301 struct buffer_head * ext_getblk(struct inode * inode, int block, int create)
302 {
303 struct buffer_head * bh;
304
305 if (block<0) {
306 printk("ext_getblk: block<0\n");
307 return NULL;
308 }
309 if (block >= 9+256+256*256+256*256*256) {
310 printk("ext_getblk: block>big\n");
311 return NULL;
312 }
313 if (block<9)
314 return inode_getblk(inode,block,create);
315 block -= 9;
316 if (block<256) {
317 bh = inode_getblk(inode,9,create);
318 return block_getblk(inode,bh,block,create);
319 }
320 block -= 256;
321 if (block<256*256) {
322 bh = inode_getblk(inode,10,create);
323 bh = block_getblk(inode,bh,block>>8,create);
324 return block_getblk(inode,bh,block & 255,create);
325 }
326 block -= 256*256;
327 bh = inode_getblk(inode,11,create);
328 bh = block_getblk(inode,bh,block>>16,create);
329 bh = block_getblk(inode,bh,(block>>8) & 255,create);
330 return block_getblk(inode,bh,block & 255,create);
331 }
332
333 struct buffer_head * ext_bread(struct inode * inode, int block, int create)
334 {
335 struct buffer_head * bh;
336
337 bh = ext_getblk(inode,block,create);
338 if (!bh || bh->b_uptodate)
339 return bh;
340 ll_rw_block(READ, 1, &bh);
341 wait_on_buffer(bh);
342 if (bh->b_uptodate)
343 return bh;
344 brelse(bh);
345 return NULL;
346 }
347
348 void ext_read_inode(struct inode * inode)
349 {
350 struct buffer_head * bh;
351 struct ext_inode * raw_inode;
352 int block;
353
354 block = 2 + (inode->i_ino-1)/EXT_INODES_PER_BLOCK;
355 if (!(bh=bread(inode->i_dev, block, BLOCK_SIZE)))
356 panic("unable to read i-node block");
357 raw_inode = ((struct ext_inode *) bh->b_data) +
358 (inode->i_ino-1)%EXT_INODES_PER_BLOCK;
359 inode->i_mode = raw_inode->i_mode;
360 inode->i_uid = raw_inode->i_uid;
361 inode->i_gid = raw_inode->i_gid;
362 inode->i_nlink = raw_inode->i_nlinks;
363 inode->i_size = raw_inode->i_size;
364 inode->i_mtime = inode->i_atime = inode->i_ctime = raw_inode->i_time;
365 inode->i_blocks = inode->i_blksize = 0;
366 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
367 inode->i_rdev = raw_inode->i_zone[0];
368 else for (block = 0; block < 12; block++)
369 inode->u.ext_i.i_data[block] = raw_inode->i_zone[block];
370 brelse(bh);
371 inode->i_op = NULL;
372 if (S_ISREG(inode->i_mode))
373 inode->i_op = &ext_file_inode_operations;
374 else if (S_ISDIR(inode->i_mode))
375 inode->i_op = &ext_dir_inode_operations;
376 else if (S_ISLNK(inode->i_mode))
377 inode->i_op = &ext_symlink_inode_operations;
378 else if (S_ISCHR(inode->i_mode))
379 inode->i_op = &chrdev_inode_operations;
380 else if (S_ISBLK(inode->i_mode))
381 inode->i_op = &blkdev_inode_operations;
382 else if (S_ISFIFO(inode->i_mode))
383 init_fifo(inode);
384 }
385
386 void ext_write_inode(struct inode * inode)
387 {
388 struct buffer_head * bh;
389 struct ext_inode * raw_inode;
390 int block;
391
392 block = 2 + (inode->i_ino-1)/EXT_INODES_PER_BLOCK;
393 if (!(bh=bread(inode->i_dev, block, BLOCK_SIZE)))
394 panic("unable to read i-node block");
395 raw_inode = ((struct ext_inode *)bh->b_data) +
396 (inode->i_ino-1)%EXT_INODES_PER_BLOCK;
397 raw_inode->i_mode = inode->i_mode;
398 raw_inode->i_uid = inode->i_uid;
399 raw_inode->i_gid = inode->i_gid;
400 raw_inode->i_nlinks = inode->i_nlink;
401 raw_inode->i_size = inode->i_size;
402 raw_inode->i_time = inode->i_mtime;
403 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
404 raw_inode->i_zone[0] = inode->i_rdev;
405 else for (block = 0; block < 12; block++)
406 raw_inode->i_zone[block] = inode->u.ext_i.i_data[block];
407 bh->b_dirt=1;
408 inode->i_dirt=0;
409 brelse(bh);
410 }
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