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take sched_debug.c out of nasal demon territory
[pv_ops_mirror.git] / fs / bfs / inode.c
blobf346eb14e86f37b88a820a7231eb10dc19414fd6
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, ino);
52 make_bad_inode(inode);
53 return;
54 }
55
56 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
57 di = (struct bfs_inode *)bh->b_data + off;
58
59 inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
60 if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
61 inode->i_mode |= S_IFDIR;
62 inode->i_op = &bfs_dir_inops;
63 inode->i_fop = &bfs_dir_operations;
64 } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) {
65 inode->i_mode |= S_IFREG;
66 inode->i_op = &bfs_file_inops;
67 inode->i_fop = &bfs_file_operations;
68 inode->i_mapping->a_ops = &bfs_aops;
69 }
70
71 BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock);
72 BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock);
73 inode->i_uid = le32_to_cpu(di->i_uid);
74 inode->i_gid = le32_to_cpu(di->i_gid);
75 inode->i_nlink = le32_to_cpu(di->i_nlink);
76 inode->i_size = BFS_FILESIZE(di);
77 inode->i_blocks = BFS_FILEBLOCKS(di);
78 if (inode->i_size || inode->i_blocks) dprintf("Registered inode with %lld size, %ld blocks\n", inode->i_size, inode->i_blocks);
79 inode->i_atime.tv_sec = le32_to_cpu(di->i_atime);
80 inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime);
81 inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime);
82 inode->i_atime.tv_nsec = 0;
83 inode->i_mtime.tv_nsec = 0;
84 inode->i_ctime.tv_nsec = 0;
85 BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); /* can be 0 so we store a copy */
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", inode->i_sb->s_id, ino);
110 unlock_kernel();
111 return -EIO;
112 }
113
114 off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK;
115 di = (struct bfs_inode *)bh->b_data + off;
116
117 if (ino == BFS_ROOT_INO)
118 di->i_vtype = cpu_to_le32(BFS_VDIR);
119 else
120 di->i_vtype = cpu_to_le32(BFS_VREG);
121
122 di->i_ino = cpu_to_le16(ino);
123 di->i_mode = cpu_to_le32(inode->i_mode);
124 di->i_uid = cpu_to_le32(inode->i_uid);
125 di->i_gid = cpu_to_le32(inode->i_gid);
126 di->i_nlink = cpu_to_le32(inode->i_nlink);
127 di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
128 di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
129 di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
130 i_sblock = BFS_I(inode)->i_sblock;
131 di->i_sblock = cpu_to_le32(i_sblock);
132 di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
133 di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
134
135 mark_buffer_dirty(bh);
136 dprintf("Written ino=%d into %d:%d\n",le16_to_cpu(di->i_ino),block,off);
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 block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
166 bh = sb_bread(s, block);
167 if (!bh) {
168 printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino);
169 unlock_kernel();
170 return;
171 }
172 off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK;
173 di = (struct bfs_inode *) bh->b_data + off;
174 if (bi->i_dsk_ino) {
175 info->si_freeb += 1 + bi->i_eblock - bi->i_sblock;
176 info->si_freei++;
177 clear_bit(ino, info->si_imap);
178 dump_imap("delete_inode", s);
179 }
180 di->i_ino = 0;
181 di->i_sblock = 0;
182 mark_buffer_dirty(bh);
183 brelse(bh);
184
185 /* if this was the last file, make the previous
186 block "last files last block" even if there is no real file there,
187 saves us 1 gap */
188 if (info->si_lf_eblk == BFS_I(inode)->i_eblock) {
189 info->si_lf_eblk = BFS_I(inode)->i_sblock - 1;
190 mark_buffer_dirty(info->si_sbh);
191 }
192 unlock_kernel();
193 clear_inode(inode);
194 }
195
196 static void bfs_put_super(struct super_block *s)
197 {
198 struct bfs_sb_info *info = BFS_SB(s);
199 brelse(info->si_sbh);
200 kfree(info->si_imap);
201 kfree(info);
202 s->s_fs_info = NULL;
203 }
204
205 static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
206 {
207 struct super_block *s = dentry->d_sb;
208 struct bfs_sb_info *info = BFS_SB(s);
209 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
210 buf->f_type = BFS_MAGIC;
211 buf->f_bsize = s->s_blocksize;
212 buf->f_blocks = info->si_blocks;
213 buf->f_bfree = buf->f_bavail = info->si_freeb;
214 buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
215 buf->f_ffree = info->si_freei;
216 buf->f_fsid.val[0] = (u32)id;
217 buf->f_fsid.val[1] = (u32)(id >> 32);
218 buf->f_namelen = BFS_NAMELEN;
219 return 0;
220 }
221
222 static void bfs_write_super(struct super_block *s)
223 {
224 lock_kernel();
225 if (!(s->s_flags & MS_RDONLY))
226 mark_buffer_dirty(BFS_SB(s)->si_sbh);
227 s->s_dirt = 0;
228 unlock_kernel();
229 }
230
231 static struct kmem_cache * bfs_inode_cachep;
232
233 static struct inode *bfs_alloc_inode(struct super_block *sb)
234 {
235 struct bfs_inode_info *bi;
236 bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
237 if (!bi)
238 return NULL;
239 return &bi->vfs_inode;
240 }
241
242 static void bfs_destroy_inode(struct inode *inode)
243 {
244 kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
245 }
246
247 static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
248 {
249 struct bfs_inode_info *bi = foo;
250
251 inode_init_once(&bi->vfs_inode);
252 }
253
254 static int init_inodecache(void)
255 {
256 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
257 sizeof(struct bfs_inode_info),
258 0, (SLAB_RECLAIM_ACCOUNT|
259 SLAB_MEM_SPREAD),
260 init_once);
261 if (bfs_inode_cachep == NULL)
262 return -ENOMEM;
263 return 0;
264 }
265
266 static void destroy_inodecache(void)
267 {
268 kmem_cache_destroy(bfs_inode_cachep);
269 }
270
271 static const struct super_operations bfs_sops = {
272 .alloc_inode = bfs_alloc_inode,
273 .destroy_inode = bfs_destroy_inode,
274 .read_inode = bfs_read_inode,
275 .write_inode = bfs_write_inode,
276 .delete_inode = bfs_delete_inode,
277 .put_super = bfs_put_super,
278 .write_super = bfs_write_super,
279 .statfs = bfs_statfs,
280 };
281
282 void dump_imap(const char *prefix, struct super_block * s)
283 {
284 #ifdef DEBUG
285 int i;
286 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
287
288 if (!tmpbuf)
289 return;
290 for (i=BFS_SB(s)->si_lasti; i>=0; i--) {
291 if (i > PAGE_SIZE-100) break;
292 if (test_bit(i, BFS_SB(s)->si_imap))
293 strcat(tmpbuf, "1");
294 else
295 strcat(tmpbuf, "0");
296 }
297 printk(KERN_ERR "BFS-fs: %s: lasti=%08lx <%s>\n", prefix, BFS_SB(s)->si_lasti, tmpbuf);
298 free_page((unsigned long)tmpbuf);
299 #endif
300 }
301
302 static int bfs_fill_super(struct super_block *s, void *data, int silent)
303 {
304 struct buffer_head * bh;
305 struct bfs_super_block * bfs_sb;
306 struct inode * inode;
307 unsigned i, imap_len;
308 struct bfs_sb_info * info;
309
310 info = kzalloc(sizeof(*info), GFP_KERNEL);
311 if (!info)
312 return -ENOMEM;
313 s->s_fs_info = info;
314
315 sb_set_blocksize(s, BFS_BSIZE);
316
317 bh = sb_bread(s, 0);
318 if(!bh)
319 goto out;
320 bfs_sb = (struct bfs_super_block *)bh->b_data;
321 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
322 if (!silent)
323 printf("No BFS filesystem on %s (magic=%08x)\n",
324 s->s_id, le32_to_cpu(bfs_sb->s_magic));
325 goto out;
326 }
327 if (BFS_UNCLEAN(bfs_sb, s) && !silent)
328 printf("%s is unclean, continuing\n", s->s_id);
329
330 s->s_magic = BFS_MAGIC;
331 info->si_sbh = bh;
332 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE)/sizeof(struct bfs_inode)
333 + BFS_ROOT_INO - 1;
334
335 imap_len = info->si_lasti/8 + 1;
336 info->si_imap = kzalloc(imap_len, GFP_KERNEL);
337 if (!info->si_imap)
338 goto out;
339 for (i=0; i<BFS_ROOT_INO; i++)
340 set_bit(i, info->si_imap);
341
342 s->s_op = &bfs_sops;
343 inode = iget(s, BFS_ROOT_INO);
344 if (!inode) {
345 kfree(info->si_imap);
346 goto out;
347 }
348 s->s_root = d_alloc_root(inode);
349 if (!s->s_root) {
350 iput(inode);
351 kfree(info->si_imap);
352 goto out;
353 }
354
355 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1)>>BFS_BSIZE_BITS; /* for statfs(2) */
356 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 - le32_to_cpu(bfs_sb->s_start))>>BFS_BSIZE_BITS;
357 info->si_freei = 0;
358 info->si_lf_eblk = 0;
359 info->si_lf_sblk = 0;
360 info->si_lf_ioff = 0;
361 bh = NULL;
362 for (i=BFS_ROOT_INO; i<=info->si_lasti; i++) {
363 struct bfs_inode *di;
364 int block = (i - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
365 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
366 unsigned long sblock, eblock;
367
368 if (!off) {
369 brelse(bh);
370 bh = sb_bread(s, block);
371 }
372
373 if (!bh)
374 continue;
375
376 di = (struct bfs_inode *)bh->b_data + off;
377
378 if (!di->i_ino) {
379 info->si_freei++;
380 continue;
381 }
382 set_bit(i, info->si_imap);
383 info->si_freeb -= BFS_FILEBLOCKS(di);
384
385 sblock = le32_to_cpu(di->i_sblock);
386 eblock = le32_to_cpu(di->i_eblock);
387 if (eblock > info->si_lf_eblk) {
388 info->si_lf_eblk = eblock;
389 info->si_lf_sblk = sblock;
390 info->si_lf_ioff = BFS_INO2OFF(i);
391 }
392 }
393 brelse(bh);
394 if (!(s->s_flags & MS_RDONLY)) {
395 mark_buffer_dirty(info->si_sbh);
396 s->s_dirt = 1;
397 }
398 dump_imap("read_super", s);
399 return 0;
400
401 out:
402 brelse(bh);
403 kfree(info);
404 s->s_fs_info = NULL;
405 return -EINVAL;
406 }
407
408 static int bfs_get_sb(struct file_system_type *fs_type,
409 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
410 {
411 return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt);
412 }
413
414 static struct file_system_type bfs_fs_type = {
415 .owner = THIS_MODULE,
416 .name = "bfs",
417 .get_sb = bfs_get_sb,
418 .kill_sb = kill_block_super,
419 .fs_flags = FS_REQUIRES_DEV,
420 };
421
422 static int __init init_bfs_fs(void)
423 {
424 int err = init_inodecache();
425 if (err)
426 goto out1;
427 err = register_filesystem(&bfs_fs_type);
428 if (err)
429 goto out;
430 return 0;
431 out:
432 destroy_inodecache();
433 out1:
434 return err;
435 }
436
437 static void __exit exit_bfs_fs(void)
438 {
439 unregister_filesystem(&bfs_fs_type);
440 destroy_inodecache();
441 }
442
443 module_init(init_bfs_fs)
444 module_exit(exit_bfs_fs)
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