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proc: fix NULL ->i_fop oops
[linux-2.6/verdex.git] / fs / bfs / inode.c
blob294c41baef6ed35cb65118867f965ebf522b36ec
1 /*
2 * fs/bfs/inode.c
3 * BFS superblock and inode operations.
4 * Copyright (C) 1999-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
5 * From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds.
6 *
7 * Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005.
8 */
9
10 #include <linux/module.h>
11 #include <linux/mm.h>
12 #include <linux/slab.h>
13 #include <linux/init.h>
14 #include <linux/fs.h>
15 #include <linux/smp_lock.h>
16 #include <linux/buffer_head.h>
17 #include <linux/vfs.h>
18 #include <asm/uaccess.h>
19 #include "bfs.h"
20
21 MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
22 MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux");
23 MODULE_LICENSE("GPL");
24
25 #undef DEBUG
26
27 #ifdef DEBUG
28 #define dprintf(x...) printf(x)
29 #else
30 #define dprintf(x...)
31 #endif
32
33 void dump_imap(const char *prefix, struct super_block *s);
34
35 static void bfs_read_inode(struct inode *inode)
36 {
37 unsigned long ino = inode->i_ino;
38 struct bfs_inode *di;
39 struct buffer_head *bh;
40 int block, off;
41
42 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
43 printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
44 make_bad_inode(inode);
45 return;
46 }
47
48 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
49 bh = sb_bread(inode->i_sb, block);
50 if (!bh) {
51 printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id,
52 ino);
53 make_bad_inode(inode);
54 return;
55 }
56
57 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
58 di = (struct bfs_inode *)bh->b_data + off;
59
60 inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
61 if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
62 inode->i_mode |= S_IFDIR;
63 inode->i_op = &bfs_dir_inops;
64 inode->i_fop = &bfs_dir_operations;
65 } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) {
66 inode->i_mode |= S_IFREG;
67 inode->i_op = &bfs_file_inops;
68 inode->i_fop = &bfs_file_operations;
69 inode->i_mapping->a_ops = &bfs_aops;
70 }
71
72 BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock);
73 BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock);
74 BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino);
75 inode->i_uid = le32_to_cpu(di->i_uid);
76 inode->i_gid = le32_to_cpu(di->i_gid);
77 inode->i_nlink = le32_to_cpu(di->i_nlink);
78 inode->i_size = BFS_FILESIZE(di);
79 inode->i_blocks = BFS_FILEBLOCKS(di);
80 inode->i_atime.tv_sec = le32_to_cpu(di->i_atime);
81 inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime);
82 inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime);
83 inode->i_atime.tv_nsec = 0;
84 inode->i_mtime.tv_nsec = 0;
85 inode->i_ctime.tv_nsec = 0;
86
87 brelse(bh);
88 }
89
90 static int bfs_write_inode(struct inode *inode, int unused)
91 {
92 unsigned int ino = (u16)inode->i_ino;
93 unsigned long i_sblock;
94 struct bfs_inode *di;
95 struct buffer_head *bh;
96 int block, off;
97
98 dprintf("ino=%08x\n", ino);
99
100 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
101 printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino);
102 return -EIO;
103 }
104
105 lock_kernel();
106 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
107 bh = sb_bread(inode->i_sb, block);
108 if (!bh) {
109 printf("Unable to read inode %s:%08x\n",
110 inode->i_sb->s_id, ino);
111 unlock_kernel();
112 return -EIO;
113 }
114
115 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
116 di = (struct bfs_inode *)bh->b_data + off;
117
118 if (ino == BFS_ROOT_INO)
119 di->i_vtype = cpu_to_le32(BFS_VDIR);
120 else
121 di->i_vtype = cpu_to_le32(BFS_VREG);
122
123 di->i_ino = cpu_to_le16(ino);
124 di->i_mode = cpu_to_le32(inode->i_mode);
125 di->i_uid = cpu_to_le32(inode->i_uid);
126 di->i_gid = cpu_to_le32(inode->i_gid);
127 di->i_nlink = cpu_to_le32(inode->i_nlink);
128 di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
129 di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
130 di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
131 i_sblock = BFS_I(inode)->i_sblock;
132 di->i_sblock = cpu_to_le32(i_sblock);
133 di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
134 di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
135
136 mark_buffer_dirty(bh);
137 brelse(bh);
138 unlock_kernel();
139 return 0;
140 }
141
142 static void bfs_delete_inode(struct inode *inode)
143 {
144 unsigned long ino = inode->i_ino;
145 struct bfs_inode *di;
146 struct buffer_head *bh;
147 int block, off;
148 struct super_block *s = inode->i_sb;
149 struct bfs_sb_info *info = BFS_SB(s);
150 struct bfs_inode_info *bi = BFS_I(inode);
151
152 dprintf("ino=%08lx\n", ino);
153
154 truncate_inode_pages(&inode->i_data, 0);
155
156 if ((ino < BFS_ROOT_INO) || (ino > info->si_lasti)) {
157 printf("invalid ino=%08lx\n", ino);
158 return;
159 }
160
161 inode->i_size = 0;
162 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
163 lock_kernel();
164 mark_inode_dirty(inode);
165
166 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
167 bh = sb_bread(s, block);
168 if (!bh) {
169 printf("Unable to read inode %s:%08lx\n",
170 inode->i_sb->s_id, ino);
171 unlock_kernel();
172 return;
173 }
174 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
175 di = (struct bfs_inode *)bh->b_data + off;
176 memset((void *)di, 0, sizeof(struct bfs_inode));
177 mark_buffer_dirty(bh);
178 brelse(bh);
179
180 if (bi->i_dsk_ino) {
181 info->si_freeb += BFS_FILEBLOCKS(bi);
182 info->si_freei++;
183 clear_bit(ino, info->si_imap);
184 dump_imap("delete_inode", s);
185 }
186
187 /*
188 * If this was the last file, make the previous block
189 * "last block of the last file" even if there is no
190 * real file there, saves us 1 gap.
191 */
192 if (info->si_lf_eblk == bi->i_eblock) {
193 info->si_lf_eblk = bi->i_sblock - 1;
194 mark_buffer_dirty(info->si_sbh);
195 }
196 unlock_kernel();
197 clear_inode(inode);
198 }
199
200 static void bfs_put_super(struct super_block *s)
201 {
202 struct bfs_sb_info *info = BFS_SB(s);
203 brelse(info->si_sbh);
204 kfree(info->si_imap);
205 kfree(info);
206 s->s_fs_info = NULL;
207 }
208
209 static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
210 {
211 struct super_block *s = dentry->d_sb;
212 struct bfs_sb_info *info = BFS_SB(s);
213 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
214 buf->f_type = BFS_MAGIC;
215 buf->f_bsize = s->s_blocksize;
216 buf->f_blocks = info->si_blocks;
217 buf->f_bfree = buf->f_bavail = info->si_freeb;
218 buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
219 buf->f_ffree = info->si_freei;
220 buf->f_fsid.val[0] = (u32)id;
221 buf->f_fsid.val[1] = (u32)(id >> 32);
222 buf->f_namelen = BFS_NAMELEN;
223 return 0;
224 }
225
226 static void bfs_write_super(struct super_block *s)
227 {
228 lock_kernel();
229 if (!(s->s_flags & MS_RDONLY))
230 mark_buffer_dirty(BFS_SB(s)->si_sbh);
231 s->s_dirt = 0;
232 unlock_kernel();
233 }
234
235 static struct kmem_cache *bfs_inode_cachep;
236
237 static struct inode *bfs_alloc_inode(struct super_block *sb)
238 {
239 struct bfs_inode_info *bi;
240 bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
241 if (!bi)
242 return NULL;
243 return &bi->vfs_inode;
244 }
245
246 static void bfs_destroy_inode(struct inode *inode)
247 {
248 kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
249 }
250
251 static void init_once(struct kmem_cache *cachep, void *foo)
252 {
253 struct bfs_inode_info *bi = foo;
254
255 inode_init_once(&bi->vfs_inode);
256 }
257
258 static int init_inodecache(void)
259 {
260 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
261 sizeof(struct bfs_inode_info),
262 0, (SLAB_RECLAIM_ACCOUNT|
263 SLAB_MEM_SPREAD),
264 init_once);
265 if (bfs_inode_cachep == NULL)
266 return -ENOMEM;
267 return 0;
268 }
269
270 static void destroy_inodecache(void)
271 {
272 kmem_cache_destroy(bfs_inode_cachep);
273 }
274
275 static const struct super_operations bfs_sops = {
276 .alloc_inode = bfs_alloc_inode,
277 .destroy_inode = bfs_destroy_inode,
278 .read_inode = bfs_read_inode,
279 .write_inode = bfs_write_inode,
280 .delete_inode = bfs_delete_inode,
281 .put_super = bfs_put_super,
282 .write_super = bfs_write_super,
283 .statfs = bfs_statfs,
284 };
285
286 void dump_imap(const char *prefix, struct super_block *s)
287 {
288 #ifdef DEBUG
289 int i;
290 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
291
292 if (!tmpbuf)
293 return;
294 for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
295 if (i > PAGE_SIZE - 100) break;
296 if (test_bit(i, BFS_SB(s)->si_imap))
297 strcat(tmpbuf, "1");
298 else
299 strcat(tmpbuf, "0");
300 }
301 printf("BFS-fs: %s: lasti=%08lx <%s>\n",
302 prefix, BFS_SB(s)->si_lasti, tmpbuf);
303 free_page((unsigned long)tmpbuf);
304 #endif
305 }
306
307 static int bfs_fill_super(struct super_block *s, void *data, int silent)
308 {
309 struct buffer_head *bh;
310 struct bfs_super_block *bfs_sb;
311 struct inode *inode;
312 unsigned i, imap_len;
313 struct bfs_sb_info *info;
314
315 info = kzalloc(sizeof(*info), GFP_KERNEL);
316 if (!info)
317 return -ENOMEM;
318 s->s_fs_info = info;
319
320 sb_set_blocksize(s, BFS_BSIZE);
321
322 bh = sb_bread(s, 0);
323 if(!bh)
324 goto out;
325 bfs_sb = (struct bfs_super_block *)bh->b_data;
326 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
327 if (!silent)
328 printf("No BFS filesystem on %s (magic=%08x)\n",
329 s->s_id, le32_to_cpu(bfs_sb->s_magic));
330 goto out;
331 }
332 if (BFS_UNCLEAN(bfs_sb, s) && !silent)
333 printf("%s is unclean, continuing\n", s->s_id);
334
335 s->s_magic = BFS_MAGIC;
336 info->si_sbh = bh;
337 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
338 sizeof(struct bfs_inode)
339 + BFS_ROOT_INO - 1;
340 imap_len = (info->si_lasti / 8) + 1;
341 info->si_imap = kzalloc(imap_len, GFP_KERNEL);
342 if (!info->si_imap)
343 goto out;
344 for (i = 0; i < BFS_ROOT_INO; i++)
345 set_bit(i, info->si_imap);
346
347 s->s_op = &bfs_sops;
348 inode = iget(s, BFS_ROOT_INO);
349 if (!inode) {
350 kfree(info->si_imap);
351 goto out;
352 }
353 s->s_root = d_alloc_root(inode);
354 if (!s->s_root) {
355 iput(inode);
356 kfree(info->si_imap);
357 goto out;
358 }
359
360 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
361 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
362 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
363 info->si_freei = 0;
364 info->si_lf_eblk = 0;
365 bh = NULL;
366 for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
367 struct bfs_inode *di;
368 int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
369 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
370 unsigned long sblock, eblock;
371
372 if (!off) {
373 brelse(bh);
374 bh = sb_bread(s, block);
375 }
376
377 if (!bh)
378 continue;
379
380 di = (struct bfs_inode *)bh->b_data + off;
381
382 if (!di->i_ino) {
383 info->si_freei++;
384 continue;
385 }
386 set_bit(i, info->si_imap);
387 info->si_freeb -= BFS_FILEBLOCKS(di);
388
389 sblock = le32_to_cpu(di->i_sblock);
390 eblock = le32_to_cpu(di->i_eblock);
391 if (eblock > info->si_lf_eblk)
392 info->si_lf_eblk = eblock;
393 }
394 brelse(bh);
395 if (!(s->s_flags & MS_RDONLY)) {
396 mark_buffer_dirty(info->si_sbh);
397 s->s_dirt = 1;
398 }
399 dump_imap("read_super", s);
400 return 0;
401
402 out:
403 brelse(bh);
404 kfree(info);
405 s->s_fs_info = NULL;
406 return -EINVAL;
407 }
408
409 static int bfs_get_sb(struct file_system_type *fs_type,
410 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
411 {
412 return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt);
413 }
414
415 static struct file_system_type bfs_fs_type = {
416 .owner = THIS_MODULE,
417 .name = "bfs",
418 .get_sb = bfs_get_sb,
419 .kill_sb = kill_block_super,
420 .fs_flags = FS_REQUIRES_DEV,
421 };
422
423 static int __init init_bfs_fs(void)
424 {
425 int err = init_inodecache();
426 if (err)
427 goto out1;
428 err = register_filesystem(&bfs_fs_type);
429 if (err)
430 goto out;
431 return 0;
432 out:
433 destroy_inodecache();
434 out1:
435 return err;
436 }
437
438 static void __exit exit_bfs_fs(void)
439 {
440 unregister_filesystem(&bfs_fs_type);
441 destroy_inodecache();
442 }
443
444 module_init(init_bfs_fs)
445 module_exit(exit_bfs_fs)
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