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added 2.6.29.6 aldebaran kernel
[nao-ulib.git] / kernel / 2.6.29.6-aldebaran-rt / fs / bfs / inode.c
blobcc4062d12ca21c14793fc392bbec1f20674d434c
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 struct inode *bfs_iget(struct super_block *sb, unsigned long ino)
36 {
37 struct bfs_inode *di;
38 struct inode *inode;
39 struct buffer_head *bh;
40 int block, off;
41
42 inode = iget_locked(sb, ino);
43 if (IS_ERR(inode))
44 return ERR_PTR(-ENOMEM);
45 if (!(inode->i_state & I_NEW))
46 return inode;
47
48 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
49 printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
50 goto error;
51 }
52
53 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
54 bh = sb_bread(inode->i_sb, block);
55 if (!bh) {
56 printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id,
57 ino);
58 goto error;
59 }
60
61 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
62 di = (struct bfs_inode *)bh->b_data + off;
63
64 inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
65 if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
66 inode->i_mode |= S_IFDIR;
67 inode->i_op = &bfs_dir_inops;
68 inode->i_fop = &bfs_dir_operations;
69 } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) {
70 inode->i_mode |= S_IFREG;
71 inode->i_op = &bfs_file_inops;
72 inode->i_fop = &bfs_file_operations;
73 inode->i_mapping->a_ops = &bfs_aops;
74 }
75
76 BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock);
77 BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock);
78 BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino);
79 inode->i_uid = le32_to_cpu(di->i_uid);
80 inode->i_gid = le32_to_cpu(di->i_gid);
81 inode->i_nlink = le32_to_cpu(di->i_nlink);
82 inode->i_size = BFS_FILESIZE(di);
83 inode->i_blocks = BFS_FILEBLOCKS(di);
84 inode->i_atime.tv_sec = le32_to_cpu(di->i_atime);
85 inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime);
86 inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime);
87 inode->i_atime.tv_nsec = 0;
88 inode->i_mtime.tv_nsec = 0;
89 inode->i_ctime.tv_nsec = 0;
90
91 brelse(bh);
92 unlock_new_inode(inode);
93 return inode;
94
95 error:
96 iget_failed(inode);
97 return ERR_PTR(-EIO);
98 }
99
100 static int bfs_write_inode(struct inode *inode, int unused)
101 {
102 unsigned int ino = (u16)inode->i_ino;
103 unsigned long i_sblock;
104 struct bfs_inode *di;
105 struct buffer_head *bh;
106 int block, off;
107 struct bfs_sb_info *info = BFS_SB(inode->i_sb);
108
109 dprintf("ino=%08x\n", ino);
110
111 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
112 printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino);
113 return -EIO;
114 }
115
116 mutex_lock(&info->bfs_lock);
117 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
118 bh = sb_bread(inode->i_sb, block);
119 if (!bh) {
120 printf("Unable to read inode %s:%08x\n",
121 inode->i_sb->s_id, ino);
122 mutex_unlock(&info->bfs_lock);
123 return -EIO;
124 }
125
126 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
127 di = (struct bfs_inode *)bh->b_data + off;
128
129 if (ino == BFS_ROOT_INO)
130 di->i_vtype = cpu_to_le32(BFS_VDIR);
131 else
132 di->i_vtype = cpu_to_le32(BFS_VREG);
133
134 di->i_ino = cpu_to_le16(ino);
135 di->i_mode = cpu_to_le32(inode->i_mode);
136 di->i_uid = cpu_to_le32(inode->i_uid);
137 di->i_gid = cpu_to_le32(inode->i_gid);
138 di->i_nlink = cpu_to_le32(inode->i_nlink);
139 di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
140 di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
141 di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
142 i_sblock = BFS_I(inode)->i_sblock;
143 di->i_sblock = cpu_to_le32(i_sblock);
144 di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
145 di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
146
147 mark_buffer_dirty(bh);
148 brelse(bh);
149 mutex_unlock(&info->bfs_lock);
150 return 0;
151 }
152
153 static void bfs_delete_inode(struct inode *inode)
154 {
155 unsigned long ino = inode->i_ino;
156 struct bfs_inode *di;
157 struct buffer_head *bh;
158 int block, off;
159 struct super_block *s = inode->i_sb;
160 struct bfs_sb_info *info = BFS_SB(s);
161 struct bfs_inode_info *bi = BFS_I(inode);
162
163 dprintf("ino=%08lx\n", ino);
164
165 truncate_inode_pages(&inode->i_data, 0);
166
167 if ((ino < BFS_ROOT_INO) || (ino > info->si_lasti)) {
168 printf("invalid ino=%08lx\n", ino);
169 return;
170 }
171
172 inode->i_size = 0;
173 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
174 mutex_lock(&info->bfs_lock);
175 mark_inode_dirty(inode);
176
177 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
178 bh = sb_bread(s, block);
179 if (!bh) {
180 printf("Unable to read inode %s:%08lx\n",
181 inode->i_sb->s_id, ino);
182 mutex_unlock(&info->bfs_lock);
183 return;
184 }
185 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
186 di = (struct bfs_inode *)bh->b_data + off;
187 memset((void *)di, 0, sizeof(struct bfs_inode));
188 mark_buffer_dirty(bh);
189 brelse(bh);
190
191 if (bi->i_dsk_ino) {
192 if (bi->i_sblock)
193 info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
194 info->si_freei++;
195 clear_bit(ino, info->si_imap);
196 dump_imap("delete_inode", s);
197 }
198
199 /*
200 * If this was the last file, make the previous block
201 * "last block of the last file" even if there is no
202 * real file there, saves us 1 gap.
203 */
204 if (info->si_lf_eblk == bi->i_eblock) {
205 info->si_lf_eblk = bi->i_sblock - 1;
206 mark_buffer_dirty(info->si_sbh);
207 }
208 mutex_unlock(&info->bfs_lock);
209 clear_inode(inode);
210 }
211
212 static void bfs_put_super(struct super_block *s)
213 {
214 struct bfs_sb_info *info = BFS_SB(s);
215
216 if (!info)
217 return;
218
219 brelse(info->si_sbh);
220 mutex_destroy(&info->bfs_lock);
221 kfree(info->si_imap);
222 kfree(info);
223 s->s_fs_info = NULL;
224 }
225
226 static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
227 {
228 struct super_block *s = dentry->d_sb;
229 struct bfs_sb_info *info = BFS_SB(s);
230 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
231 buf->f_type = BFS_MAGIC;
232 buf->f_bsize = s->s_blocksize;
233 buf->f_blocks = info->si_blocks;
234 buf->f_bfree = buf->f_bavail = info->si_freeb;
235 buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
236 buf->f_ffree = info->si_freei;
237 buf->f_fsid.val[0] = (u32)id;
238 buf->f_fsid.val[1] = (u32)(id >> 32);
239 buf->f_namelen = BFS_NAMELEN;
240 return 0;
241 }
242
243 static void bfs_write_super(struct super_block *s)
244 {
245 struct bfs_sb_info *info = BFS_SB(s);
246
247 mutex_lock(&info->bfs_lock);
248 if (!(s->s_flags & MS_RDONLY))
249 mark_buffer_dirty(info->si_sbh);
250 s->s_dirt = 0;
251 mutex_unlock(&info->bfs_lock);
252 }
253
254 static struct kmem_cache *bfs_inode_cachep;
255
256 static struct inode *bfs_alloc_inode(struct super_block *sb)
257 {
258 struct bfs_inode_info *bi;
259 bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
260 if (!bi)
261 return NULL;
262 return &bi->vfs_inode;
263 }
264
265 static void bfs_destroy_inode(struct inode *inode)
266 {
267 kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
268 }
269
270 static void init_once(void *foo)
271 {
272 struct bfs_inode_info *bi = foo;
273
274 inode_init_once(&bi->vfs_inode);
275 }
276
277 static int init_inodecache(void)
278 {
279 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
280 sizeof(struct bfs_inode_info),
281 0, (SLAB_RECLAIM_ACCOUNT|
282 SLAB_MEM_SPREAD),
283 init_once);
284 if (bfs_inode_cachep == NULL)
285 return -ENOMEM;
286 return 0;
287 }
288
289 static void destroy_inodecache(void)
290 {
291 kmem_cache_destroy(bfs_inode_cachep);
292 }
293
294 static const struct super_operations bfs_sops = {
295 .alloc_inode = bfs_alloc_inode,
296 .destroy_inode = bfs_destroy_inode,
297 .write_inode = bfs_write_inode,
298 .delete_inode = bfs_delete_inode,
299 .put_super = bfs_put_super,
300 .write_super = bfs_write_super,
301 .statfs = bfs_statfs,
302 };
303
304 void dump_imap(const char *prefix, struct super_block *s)
305 {
306 #ifdef DEBUG
307 int i;
308 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
309
310 if (!tmpbuf)
311 return;
312 for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
313 if (i > PAGE_SIZE - 100) break;
314 if (test_bit(i, BFS_SB(s)->si_imap))
315 strcat(tmpbuf, "1");
316 else
317 strcat(tmpbuf, "0");
318 }
319 printf("BFS-fs: %s: lasti=%08lx <%s>\n",
320 prefix, BFS_SB(s)->si_lasti, tmpbuf);
321 free_page((unsigned long)tmpbuf);
322 #endif
323 }
324
325 static int bfs_fill_super(struct super_block *s, void *data, int silent)
326 {
327 struct buffer_head *bh;
328 struct bfs_super_block *bfs_sb;
329 struct inode *inode;
330 unsigned i, imap_len;
331 struct bfs_sb_info *info;
332 long ret = -EINVAL;
333 unsigned long i_sblock, i_eblock, i_eoff, s_size;
334
335 info = kzalloc(sizeof(*info), GFP_KERNEL);
336 if (!info)
337 return -ENOMEM;
338 s->s_fs_info = info;
339
340 sb_set_blocksize(s, BFS_BSIZE);
341
342 bh = sb_bread(s, 0);
343 if(!bh)
344 goto out;
345 bfs_sb = (struct bfs_super_block *)bh->b_data;
346 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
347 if (!silent)
348 printf("No BFS filesystem on %s (magic=%08x)\n",
349 s->s_id, le32_to_cpu(bfs_sb->s_magic));
350 goto out;
351 }
352 if (BFS_UNCLEAN(bfs_sb, s) && !silent)
353 printf("%s is unclean, continuing\n", s->s_id);
354
355 s->s_magic = BFS_MAGIC;
356 info->si_sbh = bh;
357
358 if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) {
359 printf("Superblock is corrupted\n");
360 goto out;
361 }
362
363 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
364 sizeof(struct bfs_inode)
365 + BFS_ROOT_INO - 1;
366 imap_len = (info->si_lasti / 8) + 1;
367 info->si_imap = kzalloc(imap_len, GFP_KERNEL);
368 if (!info->si_imap)
369 goto out;
370 for (i = 0; i < BFS_ROOT_INO; i++)
371 set_bit(i, info->si_imap);
372
373 s->s_op = &bfs_sops;
374 inode = bfs_iget(s, BFS_ROOT_INO);
375 if (IS_ERR(inode)) {
376 ret = PTR_ERR(inode);
377 kfree(info->si_imap);
378 goto out;
379 }
380 s->s_root = d_alloc_root(inode);
381 if (!s->s_root) {
382 iput(inode);
383 ret = -ENOMEM;
384 kfree(info->si_imap);
385 goto out;
386 }
387
388 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
389 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
390 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
391 info->si_freei = 0;
392 info->si_lf_eblk = 0;
393
394 /* can we read the last block? */
395 bh = sb_bread(s, info->si_blocks - 1);
396 if (!bh) {
397 printf("Last block not available: %lu\n", info->si_blocks - 1);
398 iput(inode);
399 ret = -EIO;
400 kfree(info->si_imap);
401 goto out;
402 }
403 brelse(bh);
404
405 bh = NULL;
406 for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
407 struct bfs_inode *di;
408 int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
409 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
410 unsigned long eblock;
411
412 if (!off) {
413 brelse(bh);
414 bh = sb_bread(s, block);
415 }
416
417 if (!bh)
418 continue;
419
420 di = (struct bfs_inode *)bh->b_data + off;
421
422 /* test if filesystem is not corrupted */
423
424 i_eoff = le32_to_cpu(di->i_eoffset);
425 i_sblock = le32_to_cpu(di->i_sblock);
426 i_eblock = le32_to_cpu(di->i_eblock);
427 s_size = le32_to_cpu(bfs_sb->s_end);
428
429 if (i_sblock > info->si_blocks ||
430 i_eblock > info->si_blocks ||
431 i_sblock > i_eblock ||
432 i_eoff > s_size ||
433 i_sblock * BFS_BSIZE > i_eoff) {
434
435 printf("Inode 0x%08x corrupted\n", i);
436
437 brelse(bh);
438 s->s_root = NULL;
439 kfree(info->si_imap);
440 kfree(info);
441 s->s_fs_info = NULL;
442 return -EIO;
443 }
444
445 if (!di->i_ino) {
446 info->si_freei++;
447 continue;
448 }
449 set_bit(i, info->si_imap);
450 info->si_freeb -= BFS_FILEBLOCKS(di);
451
452 eblock = le32_to_cpu(di->i_eblock);
453 if (eblock > info->si_lf_eblk)
454 info->si_lf_eblk = eblock;
455 }
456 brelse(bh);
457 if (!(s->s_flags & MS_RDONLY)) {
458 mark_buffer_dirty(info->si_sbh);
459 s->s_dirt = 1;
460 }
461 dump_imap("read_super", s);
462 mutex_init(&info->bfs_lock);
463 return 0;
464
465 out:
466 brelse(bh);
467 kfree(info);
468 s->s_fs_info = NULL;
469 return ret;
470 }
471
472 static int bfs_get_sb(struct file_system_type *fs_type,
473 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
474 {
475 return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt);
476 }
477
478 static struct file_system_type bfs_fs_type = {
479 .owner = THIS_MODULE,
480 .name = "bfs",
481 .get_sb = bfs_get_sb,
482 .kill_sb = kill_block_super,
483 .fs_flags = FS_REQUIRES_DEV,
484 };
485
486 static int __init init_bfs_fs(void)
487 {
488 int err = init_inodecache();
489 if (err)
490 goto out1;
491 err = register_filesystem(&bfs_fs_type);
492 if (err)
493 goto out;
494 return 0;
495 out:
496 destroy_inodecache();
497 out1:
498 return err;
499 }
500
501 static void __exit exit_bfs_fs(void)
502 {
503 unregister_filesystem(&bfs_fs_type);
504 destroy_inodecache();
505 }
506
507 module_init(init_bfs_fs)
508 module_exit(exit_bfs_fs)
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