?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
push BKL down into ->put_super
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / bfs / inode.c
blob3a9a1361fdc177b73f26b59e9c03cdc5a9a4fd81
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 unused)
102 {
103 unsigned int ino = (u16)inode->i_ino;
104 unsigned long i_sblock;
105 struct bfs_inode *di;
106 struct buffer_head *bh;
107 int block, off;
108 struct bfs_sb_info *info = BFS_SB(inode->i_sb);
109
110 dprintf("ino=%08x\n", ino);
111
112 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
113 printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino);
114 return -EIO;
115 }
116
117 mutex_lock(&info->bfs_lock);
118 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
119 bh = sb_bread(inode->i_sb, block);
120 if (!bh) {
121 printf("Unable to read inode %s:%08x\n",
122 inode->i_sb->s_id, ino);
123 mutex_unlock(&info->bfs_lock);
124 return -EIO;
125 }
126
127 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
128 di = (struct bfs_inode *)bh->b_data + off;
129
130 if (ino == BFS_ROOT_INO)
131 di->i_vtype = cpu_to_le32(BFS_VDIR);
132 else
133 di->i_vtype = cpu_to_le32(BFS_VREG);
134
135 di->i_ino = cpu_to_le16(ino);
136 di->i_mode = cpu_to_le32(inode->i_mode);
137 di->i_uid = cpu_to_le32(inode->i_uid);
138 di->i_gid = cpu_to_le32(inode->i_gid);
139 di->i_nlink = cpu_to_le32(inode->i_nlink);
140 di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
141 di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
142 di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
143 i_sblock = BFS_I(inode)->i_sblock;
144 di->i_sblock = cpu_to_le32(i_sblock);
145 di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
146 di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
147
148 mark_buffer_dirty(bh);
149 brelse(bh);
150 mutex_unlock(&info->bfs_lock);
151 return 0;
152 }
153
154 static void bfs_delete_inode(struct inode *inode)
155 {
156 unsigned long ino = inode->i_ino;
157 struct bfs_inode *di;
158 struct buffer_head *bh;
159 int block, off;
160 struct super_block *s = inode->i_sb;
161 struct bfs_sb_info *info = BFS_SB(s);
162 struct bfs_inode_info *bi = BFS_I(inode);
163
164 dprintf("ino=%08lx\n", ino);
165
166 truncate_inode_pages(&inode->i_data, 0);
167
168 if ((ino < BFS_ROOT_INO) || (ino > info->si_lasti)) {
169 printf("invalid ino=%08lx\n", ino);
170 return;
171 }
172
173 inode->i_size = 0;
174 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
175 mutex_lock(&info->bfs_lock);
176 mark_inode_dirty(inode);
177
178 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
179 bh = sb_bread(s, block);
180 if (!bh) {
181 printf("Unable to read inode %s:%08lx\n",
182 inode->i_sb->s_id, ino);
183 mutex_unlock(&info->bfs_lock);
184 return;
185 }
186 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
187 di = (struct bfs_inode *)bh->b_data + off;
188 memset((void *)di, 0, sizeof(struct bfs_inode));
189 mark_buffer_dirty(bh);
190 brelse(bh);
191
192 if (bi->i_dsk_ino) {
193 if (bi->i_sblock)
194 info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
195 info->si_freei++;
196 clear_bit(ino, info->si_imap);
197 dump_imap("delete_inode", s);
198 }
199
200 /*
201 * If this was the last file, make the previous block
202 * "last block of the last file" even if there is no
203 * real file there, saves us 1 gap.
204 */
205 if (info->si_lf_eblk == bi->i_eblock) {
206 info->si_lf_eblk = bi->i_sblock - 1;
207 mark_buffer_dirty(info->si_sbh);
208 }
209 mutex_unlock(&info->bfs_lock);
210 clear_inode(inode);
211 }
212
213 static void bfs_put_super(struct super_block *s)
214 {
215 struct bfs_sb_info *info = BFS_SB(s);
216
217 if (!info)
218 return;
219
220 lock_kernel();
221
222 if (s->s_dirt)
223 bfs_write_super(s);
224
225 brelse(info->si_sbh);
226 mutex_destroy(&info->bfs_lock);
227 kfree(info->si_imap);
228 kfree(info);
229 s->s_fs_info = NULL;
230
231 unlock_kernel();
232 }
233
234 static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
235 {
236 struct super_block *s = dentry->d_sb;
237 struct bfs_sb_info *info = BFS_SB(s);
238 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
239 buf->f_type = BFS_MAGIC;
240 buf->f_bsize = s->s_blocksize;
241 buf->f_blocks = info->si_blocks;
242 buf->f_bfree = buf->f_bavail = info->si_freeb;
243 buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
244 buf->f_ffree = info->si_freei;
245 buf->f_fsid.val[0] = (u32)id;
246 buf->f_fsid.val[1] = (u32)(id >> 32);
247 buf->f_namelen = BFS_NAMELEN;
248 return 0;
249 }
250
251 static void bfs_write_super(struct super_block *s)
252 {
253 struct bfs_sb_info *info = BFS_SB(s);
254
255 mutex_lock(&info->bfs_lock);
256 if (!(s->s_flags & MS_RDONLY))
257 mark_buffer_dirty(info->si_sbh);
258 s->s_dirt = 0;
259 mutex_unlock(&info->bfs_lock);
260 }
261
262 static struct kmem_cache *bfs_inode_cachep;
263
264 static struct inode *bfs_alloc_inode(struct super_block *sb)
265 {
266 struct bfs_inode_info *bi;
267 bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
268 if (!bi)
269 return NULL;
270 return &bi->vfs_inode;
271 }
272
273 static void bfs_destroy_inode(struct inode *inode)
274 {
275 kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
276 }
277
278 static void init_once(void *foo)
279 {
280 struct bfs_inode_info *bi = foo;
281
282 inode_init_once(&bi->vfs_inode);
283 }
284
285 static int init_inodecache(void)
286 {
287 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
288 sizeof(struct bfs_inode_info),
289 0, (SLAB_RECLAIM_ACCOUNT|
290 SLAB_MEM_SPREAD),
291 init_once);
292 if (bfs_inode_cachep == NULL)
293 return -ENOMEM;
294 return 0;
295 }
296
297 static void destroy_inodecache(void)
298 {
299 kmem_cache_destroy(bfs_inode_cachep);
300 }
301
302 static const struct super_operations bfs_sops = {
303 .alloc_inode = bfs_alloc_inode,
304 .destroy_inode = bfs_destroy_inode,
305 .write_inode = bfs_write_inode,
306 .delete_inode = bfs_delete_inode,
307 .put_super = bfs_put_super,
308 .write_super = bfs_write_super,
309 .statfs = bfs_statfs,
310 };
311
312 void dump_imap(const char *prefix, struct super_block *s)
313 {
314 #ifdef DEBUG
315 int i;
316 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
317
318 if (!tmpbuf)
319 return;
320 for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
321 if (i > PAGE_SIZE - 100) break;
322 if (test_bit(i, BFS_SB(s)->si_imap))
323 strcat(tmpbuf, "1");
324 else
325 strcat(tmpbuf, "0");
326 }
327 printf("BFS-fs: %s: lasti=%08lx <%s>\n",
328 prefix, BFS_SB(s)->si_lasti, tmpbuf);
329 free_page((unsigned long)tmpbuf);
330 #endif
331 }
332
333 static int bfs_fill_super(struct super_block *s, void *data, int silent)
334 {
335 struct buffer_head *bh;
336 struct bfs_super_block *bfs_sb;
337 struct inode *inode;
338 unsigned i, imap_len;
339 struct bfs_sb_info *info;
340 long ret = -EINVAL;
341 unsigned long i_sblock, i_eblock, i_eoff, s_size;
342
343 info = kzalloc(sizeof(*info), GFP_KERNEL);
344 if (!info)
345 return -ENOMEM;
346 s->s_fs_info = info;
347
348 sb_set_blocksize(s, BFS_BSIZE);
349
350 bh = sb_bread(s, 0);
351 if(!bh)
352 goto out;
353 bfs_sb = (struct bfs_super_block *)bh->b_data;
354 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
355 if (!silent)
356 printf("No BFS filesystem on %s (magic=%08x)\n",
357 s->s_id, le32_to_cpu(bfs_sb->s_magic));
358 goto out;
359 }
360 if (BFS_UNCLEAN(bfs_sb, s) && !silent)
361 printf("%s is unclean, continuing\n", s->s_id);
362
363 s->s_magic = BFS_MAGIC;
364 info->si_sbh = bh;
365
366 if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) {
367 printf("Superblock is corrupted\n");
368 goto out;
369 }
370
371 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
372 sizeof(struct bfs_inode)
373 + BFS_ROOT_INO - 1;
374 imap_len = (info->si_lasti / 8) + 1;
375 info->si_imap = kzalloc(imap_len, GFP_KERNEL);
376 if (!info->si_imap)
377 goto out;
378 for (i = 0; i < BFS_ROOT_INO; i++)
379 set_bit(i, info->si_imap);
380
381 s->s_op = &bfs_sops;
382 inode = bfs_iget(s, BFS_ROOT_INO);
383 if (IS_ERR(inode)) {
384 ret = PTR_ERR(inode);
385 kfree(info->si_imap);
386 goto out;
387 }
388 s->s_root = d_alloc_root(inode);
389 if (!s->s_root) {
390 iput(inode);
391 ret = -ENOMEM;
392 kfree(info->si_imap);
393 goto out;
394 }
395
396 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
397 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
398 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
399 info->si_freei = 0;
400 info->si_lf_eblk = 0;
401
402 /* can we read the last block? */
403 bh = sb_bread(s, info->si_blocks - 1);
404 if (!bh) {
405 printf("Last block not available: %lu\n", info->si_blocks - 1);
406 iput(inode);
407 ret = -EIO;
408 kfree(info->si_imap);
409 goto out;
410 }
411 brelse(bh);
412
413 bh = NULL;
414 for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
415 struct bfs_inode *di;
416 int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
417 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
418 unsigned long eblock;
419
420 if (!off) {
421 brelse(bh);
422 bh = sb_bread(s, block);
423 }
424
425 if (!bh)
426 continue;
427
428 di = (struct bfs_inode *)bh->b_data + off;
429
430 /* test if filesystem is not corrupted */
431
432 i_eoff = le32_to_cpu(di->i_eoffset);
433 i_sblock = le32_to_cpu(di->i_sblock);
434 i_eblock = le32_to_cpu(di->i_eblock);
435 s_size = le32_to_cpu(bfs_sb->s_end);
436
437 if (i_sblock > info->si_blocks ||
438 i_eblock > info->si_blocks ||
439 i_sblock > i_eblock ||
440 i_eoff > s_size ||
441 i_sblock * BFS_BSIZE > i_eoff) {
442
443 printf("Inode 0x%08x corrupted\n", i);
444
445 brelse(bh);
446 s->s_root = NULL;
447 kfree(info->si_imap);
448 kfree(info);
449 s->s_fs_info = NULL;
450 return -EIO;
451 }
452
453 if (!di->i_ino) {
454 info->si_freei++;
455 continue;
456 }
457 set_bit(i, info->si_imap);
458 info->si_freeb -= BFS_FILEBLOCKS(di);
459
460 eblock = le32_to_cpu(di->i_eblock);
461 if (eblock > info->si_lf_eblk)
462 info->si_lf_eblk = eblock;
463 }
464 brelse(bh);
465 if (!(s->s_flags & MS_RDONLY)) {
466 mark_buffer_dirty(info->si_sbh);
467 s->s_dirt = 1;
468 }
469 dump_imap("read_super", s);
470 mutex_init(&info->bfs_lock);
471 return 0;
472
473 out:
474 brelse(bh);
475 kfree(info);
476 s->s_fs_info = NULL;
477 return ret;
478 }
479
480 static int bfs_get_sb(struct file_system_type *fs_type,
481 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
482 {
483 return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt);
484 }
485
486 static struct file_system_type bfs_fs_type = {
487 .owner = THIS_MODULE,
488 .name = "bfs",
489 .get_sb = bfs_get_sb,
490 .kill_sb = kill_block_super,
491 .fs_flags = FS_REQUIRES_DEV,
492 };
493
494 static int __init init_bfs_fs(void)
495 {
496 int err = init_inodecache();
497 if (err)
498 goto out1;
499 err = register_filesystem(&bfs_fs_type);
500 if (err)
501 goto out;
502 return 0;
503 out:
504 destroy_inodecache();
505 out1:
506 return err;
507 }
508
509 static void __exit exit_bfs_fs(void)
510 {
511 unregister_filesystem(&bfs_fs_type);
512 destroy_inodecache();
513 }
514
515 module_init(init_bfs_fs)
516 module_exit(exit_bfs_fs)
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree