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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 <linux/writeback.h>
19#include <asm/uaccess.h>
20#include "bfs.h"
21
22MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
23MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux");
24MODULE_LICENSE("GPL");
25
26#undef DEBUG
27
28#ifdef DEBUG
29#define dprintf(x...) printf(x)
30#else
31#define dprintf(x...)
32#endif
33
34static void bfs_write_super(struct super_block *s);
35void dump_imap(const char *prefix, struct super_block *s);
36
37struct inode *bfs_iget(struct super_block *sb, unsigned long ino)
38{
39 struct bfs_inode *di;
40 struct inode *inode;
41 struct buffer_head *bh;
42 int block, off;
43
44 inode = iget_locked(sb, ino);
45 if (IS_ERR(inode))
46 return ERR_PTR(-ENOMEM);
47 if (!(inode->i_state & I_NEW))
48 return inode;
49
50 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
51 printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
52 goto error;
53 }
54
55 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
56 bh = sb_bread(inode->i_sb, block);
57 if (!bh) {
58 printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id,
59 ino);
60 goto error;
61 }
62
63 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
64 di = (struct bfs_inode *)bh->b_data + off;
65
66 inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
67 if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
68 inode->i_mode |= S_IFDIR;
69 inode->i_op = &bfs_dir_inops;
70 inode->i_fop = &bfs_dir_operations;
71 } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) {
72 inode->i_mode |= S_IFREG;
73 inode->i_op = &bfs_file_inops;
74 inode->i_fop = &bfs_file_operations;
75 inode->i_mapping->a_ops = &bfs_aops;
76 }
77
78 BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock);
79 BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock);
80 BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino);
81 inode->i_uid = le32_to_cpu(di->i_uid);
82 inode->i_gid = le32_to_cpu(di->i_gid);
83 inode->i_nlink = le32_to_cpu(di->i_nlink);
84 inode->i_size = BFS_FILESIZE(di);
85 inode->i_blocks = BFS_FILEBLOCKS(di);
86 inode->i_atime.tv_sec = le32_to_cpu(di->i_atime);
87 inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime);
88 inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime);
89 inode->i_atime.tv_nsec = 0;
90 inode->i_mtime.tv_nsec = 0;
91 inode->i_ctime.tv_nsec = 0;
92
93 brelse(bh);
94 unlock_new_inode(inode);
95 return inode;
96
97error:
98 iget_failed(inode);
99 return ERR_PTR(-EIO);
100}
101
102static int bfs_write_inode(struct inode *inode, struct writeback_control *wbc)
103{
104 struct bfs_sb_info *info = BFS_SB(inode->i_sb);
105 unsigned int ino = (u16)inode->i_ino;
106 unsigned long i_sblock;
107 struct bfs_inode *di;
108 struct buffer_head *bh;
109 int block, off;
110 int err = 0;
111
112 dprintf("ino=%08x\n", ino);
113
114 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
115 printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino);
116 return -EIO;
117 }
118
119 mutex_lock(&info->bfs_lock);
120 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
121 bh = sb_bread(inode->i_sb, block);
122 if (!bh) {
123 printf("Unable to read inode %s:%08x\n",
124 inode->i_sb->s_id, ino);
125 mutex_unlock(&info->bfs_lock);
126 return -EIO;
127 }
128
129 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
130 di = (struct bfs_inode *)bh->b_data + off;
131
132 if (ino == BFS_ROOT_INO)
133 di->i_vtype = cpu_to_le32(BFS_VDIR);
134 else
135 di->i_vtype = cpu_to_le32(BFS_VREG);
136
137 di->i_ino = cpu_to_le16(ino);
138 di->i_mode = cpu_to_le32(inode->i_mode);
139 di->i_uid = cpu_to_le32(inode->i_uid);
140 di->i_gid = cpu_to_le32(inode->i_gid);
141 di->i_nlink = cpu_to_le32(inode->i_nlink);
142 di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
143 di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
144 di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
145 i_sblock = BFS_I(inode)->i_sblock;
146 di->i_sblock = cpu_to_le32(i_sblock);
147 di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
148 di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
149
150 mark_buffer_dirty(bh);
151 if (wbc->sync_mode == WB_SYNC_ALL) {
152 sync_dirty_buffer(bh);
153 if (buffer_req(bh) && !buffer_uptodate(bh))
154 err = -EIO;
155 }
156 brelse(bh);
157 mutex_unlock(&info->bfs_lock);
158 return err;
159}
160
161static void bfs_delete_inode(struct inode *inode)
162{
163 unsigned long ino = inode->i_ino;
164 struct bfs_inode *di;
165 struct buffer_head *bh;
166 int block, off;
167 struct super_block *s = inode->i_sb;
168 struct bfs_sb_info *info = BFS_SB(s);
169 struct bfs_inode_info *bi = BFS_I(inode);
170
171 dprintf("ino=%08lx\n", ino);
172
173 truncate_inode_pages(&inode->i_data, 0);
174
175 if ((ino < BFS_ROOT_INO) || (ino > info->si_lasti)) {
176 printf("invalid ino=%08lx\n", ino);
177 return;
178 }
179
180 inode->i_size = 0;
181 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
182 mutex_lock(&info->bfs_lock);
183 mark_inode_dirty(inode);
184
185 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
186 bh = sb_bread(s, block);
187 if (!bh) {
188 printf("Unable to read inode %s:%08lx\n",
189 inode->i_sb->s_id, ino);
190 mutex_unlock(&info->bfs_lock);
191 return;
192 }
193 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
194 di = (struct bfs_inode *)bh->b_data + off;
195 memset((void *)di, 0, sizeof(struct bfs_inode));
196 mark_buffer_dirty(bh);
197 brelse(bh);
198
199 if (bi->i_dsk_ino) {
200 if (bi->i_sblock)
201 info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
202 info->si_freei++;
203 clear_bit(ino, info->si_imap);
204 dump_imap("delete_inode", s);
205 }
206
207
208
209
210
211
212 if (info->si_lf_eblk == bi->i_eblock) {
213 info->si_lf_eblk = bi->i_sblock - 1;
214 mark_buffer_dirty(info->si_sbh);
215 }
216 mutex_unlock(&info->bfs_lock);
217 clear_inode(inode);
218}
219
220static int bfs_sync_fs(struct super_block *sb, int wait)
221{
222 struct bfs_sb_info *info = BFS_SB(sb);
223
224 mutex_lock(&info->bfs_lock);
225 mark_buffer_dirty(info->si_sbh);
226 sb->s_dirt = 0;
227 mutex_unlock(&info->bfs_lock);
228
229 return 0;
230}
231
232static void bfs_write_super(struct super_block *sb)
233{
234 if (!(sb->s_flags & MS_RDONLY))
235 bfs_sync_fs(sb, 1);
236 else
237 sb->s_dirt = 0;
238}
239
240static void bfs_put_super(struct super_block *s)
241{
242 struct bfs_sb_info *info = BFS_SB(s);
243
244 if (!info)
245 return;
246
247 lock_kernel();
248
249 if (s->s_dirt)
250 bfs_write_super(s);
251
252 brelse(info->si_sbh);
253 mutex_destroy(&info->bfs_lock);
254 kfree(info->si_imap);
255 kfree(info);
256 s->s_fs_info = NULL;
257
258 unlock_kernel();
259}
260
261static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
262{
263 struct super_block *s = dentry->d_sb;
264 struct bfs_sb_info *info = BFS_SB(s);
265 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
266 buf->f_type = BFS_MAGIC;
267 buf->f_bsize = s->s_blocksize;
268 buf->f_blocks = info->si_blocks;
269 buf->f_bfree = buf->f_bavail = info->si_freeb;
270 buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
271 buf->f_ffree = info->si_freei;
272 buf->f_fsid.val[0] = (u32)id;
273 buf->f_fsid.val[1] = (u32)(id >> 32);
274 buf->f_namelen = BFS_NAMELEN;
275 return 0;
276}
277
278static struct kmem_cache *bfs_inode_cachep;
279
280static struct inode *bfs_alloc_inode(struct super_block *sb)
281{
282 struct bfs_inode_info *bi;
283 bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
284 if (!bi)
285 return NULL;
286 return &bi->vfs_inode;
287}
288
289static void bfs_destroy_inode(struct inode *inode)
290{
291 kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
292}
293
294static void init_once(void *foo)
295{
296 struct bfs_inode_info *bi = foo;
297
298 inode_init_once(&bi->vfs_inode);
299}
300
301static int init_inodecache(void)
302{
303 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
304 sizeof(struct bfs_inode_info),
305 0, (SLAB_RECLAIM_ACCOUNT|
306 SLAB_MEM_SPREAD),
307 init_once);
308 if (bfs_inode_cachep == NULL)
309 return -ENOMEM;
310 return 0;
311}
312
313static void destroy_inodecache(void)
314{
315 kmem_cache_destroy(bfs_inode_cachep);
316}
317
318static const struct super_operations bfs_sops = {
319 .alloc_inode = bfs_alloc_inode,
320 .destroy_inode = bfs_destroy_inode,
321 .write_inode = bfs_write_inode,
322 .delete_inode = bfs_delete_inode,
323 .put_super = bfs_put_super,
324 .write_super = bfs_write_super,
325 .sync_fs = bfs_sync_fs,
326 .statfs = bfs_statfs,
327};
328
329void dump_imap(const char *prefix, struct super_block *s)
330{
331#ifdef DEBUG
332 int i;
333 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
334
335 if (!tmpbuf)
336 return;
337 for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
338 if (i > PAGE_SIZE - 100) break;
339 if (test_bit(i, BFS_SB(s)->si_imap))
340 strcat(tmpbuf, "1");
341 else
342 strcat(tmpbuf, "0");
343 }
344 printf("BFS-fs: %s: lasti=%08lx <%s>\n",
345 prefix, BFS_SB(s)->si_lasti, tmpbuf);
346 free_page((unsigned long)tmpbuf);
347#endif
348}
349
350static int bfs_fill_super(struct super_block *s, void *data, int silent)
351{
352 struct buffer_head *bh;
353 struct bfs_super_block *bfs_sb;
354 struct inode *inode;
355 unsigned i, imap_len;
356 struct bfs_sb_info *info;
357 int ret = -EINVAL;
358 unsigned long i_sblock, i_eblock, i_eoff, s_size;
359
360 info = kzalloc(sizeof(*info), GFP_KERNEL);
361 if (!info)
362 return -ENOMEM;
363 mutex_init(&info->bfs_lock);
364 s->s_fs_info = info;
365
366 sb_set_blocksize(s, BFS_BSIZE);
367
368 info->si_sbh = sb_bread(s, 0);
369 if (!info->si_sbh)
370 goto out;
371 bfs_sb = (struct bfs_super_block *)info->si_sbh->b_data;
372 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
373 if (!silent)
374 printf("No BFS filesystem on %s (magic=%08x)\n",
375 s->s_id, le32_to_cpu(bfs_sb->s_magic));
376 goto out1;
377 }
378 if (BFS_UNCLEAN(bfs_sb, s) && !silent)
379 printf("%s is unclean, continuing\n", s->s_id);
380
381 s->s_magic = BFS_MAGIC;
382
383 if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) {
384 printf("Superblock is corrupted\n");
385 goto out1;
386 }
387
388 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
389 sizeof(struct bfs_inode)
390 + BFS_ROOT_INO - 1;
391 imap_len = (info->si_lasti / 8) + 1;
392 info->si_imap = kzalloc(imap_len, GFP_KERNEL);
393 if (!info->si_imap)
394 goto out1;
395 for (i = 0; i < BFS_ROOT_INO; i++)
396 set_bit(i, info->si_imap);
397
398 s->s_op = &bfs_sops;
399 inode = bfs_iget(s, BFS_ROOT_INO);
400 if (IS_ERR(inode)) {
401 ret = PTR_ERR(inode);
402 goto out2;
403 }
404 s->s_root = d_alloc_root(inode);
405 if (!s->s_root) {
406 iput(inode);
407 ret = -ENOMEM;
408 goto out2;
409 }
410
411 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
412 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
413 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
414 info->si_freei = 0;
415 info->si_lf_eblk = 0;
416
417
418 bh = sb_bread(s, info->si_blocks - 1);
419 if (!bh) {
420 printf("Last block not available: %lu\n", info->si_blocks - 1);
421 ret = -EIO;
422 goto out3;
423 }
424 brelse(bh);
425
426 bh = NULL;
427 for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
428 struct bfs_inode *di;
429 int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
430 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
431 unsigned long eblock;
432
433 if (!off) {
434 brelse(bh);
435 bh = sb_bread(s, block);
436 }
437
438 if (!bh)
439 continue;
440
441 di = (struct bfs_inode *)bh->b_data + off;
442
443
444
445 i_eoff = le32_to_cpu(di->i_eoffset);
446 i_sblock = le32_to_cpu(di->i_sblock);
447 i_eblock = le32_to_cpu(di->i_eblock);
448 s_size = le32_to_cpu(bfs_sb->s_end);
449
450 if (i_sblock > info->si_blocks ||
451 i_eblock > info->si_blocks ||
452 i_sblock > i_eblock ||
453 i_eoff > s_size ||
454 i_sblock * BFS_BSIZE > i_eoff) {
455
456 printf("Inode 0x%08x corrupted\n", i);
457
458 brelse(bh);
459 ret = -EIO;
460 goto out3;
461 }
462
463 if (!di->i_ino) {
464 info->si_freei++;
465 continue;
466 }
467 set_bit(i, info->si_imap);
468 info->si_freeb -= BFS_FILEBLOCKS(di);
469
470 eblock = le32_to_cpu(di->i_eblock);
471 if (eblock > info->si_lf_eblk)
472 info->si_lf_eblk = eblock;
473 }
474 brelse(bh);
475 if (!(s->s_flags & MS_RDONLY)) {
476 mark_buffer_dirty(info->si_sbh);
477 s->s_dirt = 1;
478 }
479 dump_imap("read_super", s);
480 return 0;
481
482out3:
483 dput(s->s_root);
484 s->s_root = NULL;
485out2:
486 kfree(info->si_imap);
487out1:
488 brelse(info->si_sbh);
489out:
490 mutex_destroy(&info->bfs_lock);
491 kfree(info);
492 s->s_fs_info = NULL;
493 return ret;
494}
495
496static 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
502static 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
510static 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;
519out:
520 destroy_inodecache();
521out1:
522 return err;
523}
524
525static void __exit exit_bfs_fs(void)
526{
527 unregister_filesystem(&bfs_fs_type);
528 destroy_inodecache();
529}
530
531module_init(init_bfs_fs)
532module_exit(exit_bfs_fs)
533
