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md: Fix unfortunate interaction with evms
[linux-2.6/mini2440.git] / fs / bfs / inode.c
blob6f60336c6628182804aa39086040968f174fbba7
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 static void bfs_write_super(struct super_block *s);
34 void dump_imap(const char *prefix, struct super_block *s);
35
36 struct inode *bfs_iget(struct super_block *sb, unsigned long ino)
37 {
38 struct bfs_inode *di;
39 struct inode *inode;
40 struct buffer_head *bh;
41 int block, off;
42
43 inode = iget_locked(sb, ino);
44 if (IS_ERR(inode))
45 return ERR_PTR(-ENOMEM);
46 if (!(inode->i_state & I_NEW))
47 return inode;
48
49 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
50 printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
51 goto error;
52 }
53
54 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
55 bh = sb_bread(inode->i_sb, block);
56 if (!bh) {
57 printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id,
58 ino);
59 goto error;
60 }
61
62 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
63 di = (struct bfs_inode *)bh->b_data + off;
64
65 inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
66 if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
67 inode->i_mode |= S_IFDIR;
68 inode->i_op = &bfs_dir_inops;
69 inode->i_fop = &bfs_dir_operations;
70 } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) {
71 inode->i_mode |= S_IFREG;
72 inode->i_op = &bfs_file_inops;
73 inode->i_fop = &bfs_file_operations;
74 inode->i_mapping->a_ops = &bfs_aops;
75 }
76
77 BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock);
78 BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock);
79 BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino);
80 inode->i_uid = le32_to_cpu(di->i_uid);
81 inode->i_gid = le32_to_cpu(di->i_gid);
82 inode->i_nlink = le32_to_cpu(di->i_nlink);
83 inode->i_size = BFS_FILESIZE(di);
84 inode->i_blocks = BFS_FILEBLOCKS(di);
85 inode->i_atime.tv_sec = le32_to_cpu(di->i_atime);
86 inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime);
87 inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime);
88 inode->i_atime.tv_nsec = 0;
89 inode->i_mtime.tv_nsec = 0;
90 inode->i_ctime.tv_nsec = 0;
91
92 brelse(bh);
93 unlock_new_inode(inode);
94 return inode;
95
96 error:
97 iget_failed(inode);
98 return ERR_PTR(-EIO);
99 }
100
101 static int bfs_write_inode(struct inode *inode, int wait)
102 {
103 struct bfs_sb_info *info = BFS_SB(inode->i_sb);
104 unsigned int ino = (u16)inode->i_ino;
105 unsigned long i_sblock;
106 struct bfs_inode *di;
107 struct buffer_head *bh;
108 int block, off;
109 int err = 0;
110
111 dprintf("ino=%08x\n", ino);
112
113 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
114 printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino);
115 return -EIO;
116 }
117
118 mutex_lock(&info->bfs_lock);
119 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
120 bh = sb_bread(inode->i_sb, block);
121 if (!bh) {
122 printf("Unable to read inode %s:%08x\n",
123 inode->i_sb->s_id, ino);
124 mutex_unlock(&info->bfs_lock);
125 return -EIO;
126 }
127
128 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
129 di = (struct bfs_inode *)bh->b_data + off;
130
131 if (ino == BFS_ROOT_INO)
132 di->i_vtype = cpu_to_le32(BFS_VDIR);
133 else
134 di->i_vtype = cpu_to_le32(BFS_VREG);
135
136 di->i_ino = cpu_to_le16(ino);
137 di->i_mode = cpu_to_le32(inode->i_mode);
138 di->i_uid = cpu_to_le32(inode->i_uid);
139 di->i_gid = cpu_to_le32(inode->i_gid);
140 di->i_nlink = cpu_to_le32(inode->i_nlink);
141 di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
142 di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
143 di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
144 i_sblock = BFS_I(inode)->i_sblock;
145 di->i_sblock = cpu_to_le32(i_sblock);
146 di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
147 di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
148
149 mark_buffer_dirty(bh);
150 if (wait) {
151 sync_dirty_buffer(bh);
152 if (buffer_req(bh) && !buffer_uptodate(bh))
153 err = -EIO;
154 }
155 brelse(bh);
156 mutex_unlock(&info->bfs_lock);
157 return err;
158 }
159
160 static void bfs_delete_inode(struct inode *inode)
161 {
162 unsigned long ino = inode->i_ino;
163 struct bfs_inode *di;
164 struct buffer_head *bh;
165 int block, off;
166 struct super_block *s = inode->i_sb;
167 struct bfs_sb_info *info = BFS_SB(s);
168 struct bfs_inode_info *bi = BFS_I(inode);
169
170 dprintf("ino=%08lx\n", ino);
171
172 truncate_inode_pages(&inode->i_data, 0);
173
174 if ((ino < BFS_ROOT_INO) || (ino > info->si_lasti)) {
175 printf("invalid ino=%08lx\n", ino);
176 return;
177 }
178
179 inode->i_size = 0;
180 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
181 mutex_lock(&info->bfs_lock);
182 mark_inode_dirty(inode);
183
184 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
185 bh = sb_bread(s, block);
186 if (!bh) {
187 printf("Unable to read inode %s:%08lx\n",
188 inode->i_sb->s_id, ino);
189 mutex_unlock(&info->bfs_lock);
190 return;
191 }
192 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
193 di = (struct bfs_inode *)bh->b_data + off;
194 memset((void *)di, 0, sizeof(struct bfs_inode));
195 mark_buffer_dirty(bh);
196 brelse(bh);
197
198 if (bi->i_dsk_ino) {
199 if (bi->i_sblock)
200 info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
201 info->si_freei++;
202 clear_bit(ino, info->si_imap);
203 dump_imap("delete_inode", s);
204 }
205
206 /*
207 * If this was the last file, make the previous block
208 * "last block of the last file" even if there is no
209 * real file there, saves us 1 gap.
210 */
211 if (info->si_lf_eblk == bi->i_eblock) {
212 info->si_lf_eblk = bi->i_sblock - 1;
213 mark_buffer_dirty(info->si_sbh);
214 }
215 mutex_unlock(&info->bfs_lock);
216 clear_inode(inode);
217 }
218
219 static int bfs_sync_fs(struct super_block *sb, int wait)
220 {
221 struct bfs_sb_info *info = BFS_SB(sb);
222
223 mutex_lock(&info->bfs_lock);
224 mark_buffer_dirty(info->si_sbh);
225 sb->s_dirt = 0;
226 mutex_unlock(&info->bfs_lock);
227
228 return 0;
229 }
230
231 static void bfs_write_super(struct super_block *sb)
232 {
233 if (!(sb->s_flags & MS_RDONLY))
234 bfs_sync_fs(sb, 1);
235 else
236 sb->s_dirt = 0;
237 }
238
239 static void bfs_put_super(struct super_block *s)
240 {
241 struct bfs_sb_info *info = BFS_SB(s);
242
243 if (!info)
244 return;
245
246 lock_kernel();
247
248 if (s->s_dirt)
249 bfs_write_super(s);
250
251 brelse(info->si_sbh);
252 mutex_destroy(&info->bfs_lock);
253 kfree(info->si_imap);
254 kfree(info);
255 s->s_fs_info = NULL;
256
257 unlock_kernel();
258 }
259
260 static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
261 {
262 struct super_block *s = dentry->d_sb;
263 struct bfs_sb_info *info = BFS_SB(s);
264 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
265 buf->f_type = BFS_MAGIC;
266 buf->f_bsize = s->s_blocksize;
267 buf->f_blocks = info->si_blocks;
268 buf->f_bfree = buf->f_bavail = info->si_freeb;
269 buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
270 buf->f_ffree = info->si_freei;
271 buf->f_fsid.val[0] = (u32)id;
272 buf->f_fsid.val[1] = (u32)(id >> 32);
273 buf->f_namelen = BFS_NAMELEN;
274 return 0;
275 }
276
277 static struct kmem_cache *bfs_inode_cachep;
278
279 static struct inode *bfs_alloc_inode(struct super_block *sb)
280 {
281 struct bfs_inode_info *bi;
282 bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
283 if (!bi)
284 return NULL;
285 return &bi->vfs_inode;
286 }
287
288 static void bfs_destroy_inode(struct inode *inode)
289 {
290 kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
291 }
292
293 static void init_once(void *foo)
294 {
295 struct bfs_inode_info *bi = foo;
296
297 inode_init_once(&bi->vfs_inode);
298 }
299
300 static int init_inodecache(void)
301 {
302 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
303 sizeof(struct bfs_inode_info),
304 0, (SLAB_RECLAIM_ACCOUNT|
305 SLAB_MEM_SPREAD),
306 init_once);
307 if (bfs_inode_cachep == NULL)
308 return -ENOMEM;
309 return 0;
310 }
311
312 static void destroy_inodecache(void)
313 {
314 kmem_cache_destroy(bfs_inode_cachep);
315 }
316
317 static const struct super_operations bfs_sops = {
318 .alloc_inode = bfs_alloc_inode,
319 .destroy_inode = bfs_destroy_inode,
320 .write_inode = bfs_write_inode,
321 .delete_inode = bfs_delete_inode,
322 .put_super = bfs_put_super,
323 .write_super = bfs_write_super,
324 .sync_fs = bfs_sync_fs,
325 .statfs = bfs_statfs,
326 };
327
328 void dump_imap(const char *prefix, struct super_block *s)
329 {
330 #ifdef DEBUG
331 int i;
332 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
333
334 if (!tmpbuf)
335 return;
336 for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
337 if (i > PAGE_SIZE - 100) break;
338 if (test_bit(i, BFS_SB(s)->si_imap))
339 strcat(tmpbuf, "1");
340 else
341 strcat(tmpbuf, "0");
342 }
343 printf("BFS-fs: %s: lasti=%08lx <%s>\n",
344 prefix, BFS_SB(s)->si_lasti, tmpbuf);
345 free_page((unsigned long)tmpbuf);
346 #endif
347 }
348
349 static int bfs_fill_super(struct super_block *s, void *data, int silent)
350 {
351 struct buffer_head *bh;
352 struct bfs_super_block *bfs_sb;
353 struct inode *inode;
354 unsigned i, imap_len;
355 struct bfs_sb_info *info;
356 long ret = -EINVAL;
357 unsigned long i_sblock, i_eblock, i_eoff, s_size;
358
359 info = kzalloc(sizeof(*info), GFP_KERNEL);
360 if (!info)
361 return -ENOMEM;
362 s->s_fs_info = info;
363
364 sb_set_blocksize(s, BFS_BSIZE);
365
366 bh = sb_bread(s, 0);
367 if(!bh)
368 goto out;
369 bfs_sb = (struct bfs_super_block *)bh->b_data;
370 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
371 if (!silent)
372 printf("No BFS filesystem on %s (magic=%08x)\n",
373 s->s_id, le32_to_cpu(bfs_sb->s_magic));
374 goto out;
375 }
376 if (BFS_UNCLEAN(bfs_sb, s) && !silent)
377 printf("%s is unclean, continuing\n", s->s_id);
378
379 s->s_magic = BFS_MAGIC;
380 info->si_sbh = bh;
381
382 if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) {
383 printf("Superblock is corrupted\n");
384 goto out;
385 }
386
387 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
388 sizeof(struct bfs_inode)
389 + BFS_ROOT_INO - 1;
390 imap_len = (info->si_lasti / 8) + 1;
391 info->si_imap = kzalloc(imap_len, GFP_KERNEL);
392 if (!info->si_imap)
393 goto out;
394 for (i = 0; i < BFS_ROOT_INO; i++)
395 set_bit(i, info->si_imap);
396
397 s->s_op = &bfs_sops;
398 inode = bfs_iget(s, BFS_ROOT_INO);
399 if (IS_ERR(inode)) {
400 ret = PTR_ERR(inode);
401 kfree(info->si_imap);
402 goto out;
403 }
404 s->s_root = d_alloc_root(inode);
405 if (!s->s_root) {
406 iput(inode);
407 ret = -ENOMEM;
408 kfree(info->si_imap);
409 goto out;
410 }
411
412 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
413 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
414 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
415 info->si_freei = 0;
416 info->si_lf_eblk = 0;
417
418 /* can we read the last block? */
419 bh = sb_bread(s, info->si_blocks - 1);
420 if (!bh) {
421 printf("Last block not available: %lu\n", info->si_blocks - 1);
422 iput(inode);
423 ret = -EIO;
424 kfree(info->si_imap);
425 goto out;
426 }
427 brelse(bh);
428
429 bh = NULL;
430 for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
431 struct bfs_inode *di;
432 int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
433 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
434 unsigned long eblock;
435
436 if (!off) {
437 brelse(bh);
438 bh = sb_bread(s, block);
439 }
440
441 if (!bh)
442 continue;
443
444 di = (struct bfs_inode *)bh->b_data + off;
445
446 /* test if filesystem is not corrupted */
447
448 i_eoff = le32_to_cpu(di->i_eoffset);
449 i_sblock = le32_to_cpu(di->i_sblock);
450 i_eblock = le32_to_cpu(di->i_eblock);
451 s_size = le32_to_cpu(bfs_sb->s_end);
452
453 if (i_sblock > info->si_blocks ||
454 i_eblock > info->si_blocks ||
455 i_sblock > i_eblock ||
456 i_eoff > s_size ||
457 i_sblock * BFS_BSIZE > i_eoff) {
458
459 printf("Inode 0x%08x corrupted\n", i);
460
461 brelse(bh);
462 s->s_root = NULL;
463 kfree(info->si_imap);
464 kfree(info);
465 s->s_fs_info = NULL;
466 return -EIO;
467 }
468
469 if (!di->i_ino) {
470 info->si_freei++;
471 continue;
472 }
473 set_bit(i, info->si_imap);
474 info->si_freeb -= BFS_FILEBLOCKS(di);
475
476 eblock = le32_to_cpu(di->i_eblock);
477 if (eblock > info->si_lf_eblk)
478 info->si_lf_eblk = eblock;
479 }
480 brelse(bh);
481 if (!(s->s_flags & MS_RDONLY)) {
482 mark_buffer_dirty(info->si_sbh);
483 s->s_dirt = 1;
484 }
485 dump_imap("read_super", s);
486 mutex_init(&info->bfs_lock);
487 return 0;
488
489 out:
490 brelse(bh);
491 kfree(info);
492 s->s_fs_info = NULL;
493 return ret;
494 }
495
496 static int bfs_get_sb(struct file_system_type *fs_type,
497 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
498 {
499 return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt);
500 }
501
502 static struct file_system_type bfs_fs_type = {
503 .owner = THIS_MODULE,
504 .name = "bfs",
505 .get_sb = bfs_get_sb,
506 .kill_sb = kill_block_super,
507 .fs_flags = FS_REQUIRES_DEV,
508 };
509
510 static int __init init_bfs_fs(void)
511 {
512 int err = init_inodecache();
513 if (err)
514 goto out1;
515 err = register_filesystem(&bfs_fs_type);
516 if (err)
517 goto out;
518 return 0;
519 out:
520 destroy_inodecache();
521 out1:
522 return err;
523 }
524
525 static void __exit exit_bfs_fs(void)
526 {
527 unregister_filesystem(&bfs_fs_type);
528 destroy_inodecache();
529 }
530
531 module_init(init_bfs_fs)
532 module_exit(exit_bfs_fs)
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