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sched: make early bootup sched_clock() use safer
[wrt350n-kernel.git] / fs / bfs / inode.c
blob8db623838b50c78c819b70ec59e813ac13497277
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
108 dprintf("ino=%08x\n", ino);
109
110 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
111 printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino);
112 return -EIO;
113 }
114
115 lock_kernel();
116 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
117 bh = sb_bread(inode->i_sb, block);
118 if (!bh) {
119 printf("Unable to read inode %s:%08x\n",
120 inode->i_sb->s_id, ino);
121 unlock_kernel();
122 return -EIO;
123 }
124
125 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
126 di = (struct bfs_inode *)bh->b_data + off;
127
128 if (ino == BFS_ROOT_INO)
129 di->i_vtype = cpu_to_le32(BFS_VDIR);
130 else
131 di->i_vtype = cpu_to_le32(BFS_VREG);
132
133 di->i_ino = cpu_to_le16(ino);
134 di->i_mode = cpu_to_le32(inode->i_mode);
135 di->i_uid = cpu_to_le32(inode->i_uid);
136 di->i_gid = cpu_to_le32(inode->i_gid);
137 di->i_nlink = cpu_to_le32(inode->i_nlink);
138 di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
139 di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
140 di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
141 i_sblock = BFS_I(inode)->i_sblock;
142 di->i_sblock = cpu_to_le32(i_sblock);
143 di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
144 di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
145
146 mark_buffer_dirty(bh);
147 brelse(bh);
148 unlock_kernel();
149 return 0;
150 }
151
152 static void bfs_delete_inode(struct inode *inode)
153 {
154 unsigned long ino = inode->i_ino;
155 struct bfs_inode *di;
156 struct buffer_head *bh;
157 int block, off;
158 struct super_block *s = inode->i_sb;
159 struct bfs_sb_info *info = BFS_SB(s);
160 struct bfs_inode_info *bi = BFS_I(inode);
161
162 dprintf("ino=%08lx\n", ino);
163
164 truncate_inode_pages(&inode->i_data, 0);
165
166 if ((ino < BFS_ROOT_INO) || (ino > info->si_lasti)) {
167 printf("invalid ino=%08lx\n", ino);
168 return;
169 }
170
171 inode->i_size = 0;
172 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
173 lock_kernel();
174 mark_inode_dirty(inode);
175
176 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
177 bh = sb_bread(s, block);
178 if (!bh) {
179 printf("Unable to read inode %s:%08lx\n",
180 inode->i_sb->s_id, ino);
181 unlock_kernel();
182 return;
183 }
184 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
185 di = (struct bfs_inode *)bh->b_data + off;
186 memset((void *)di, 0, sizeof(struct bfs_inode));
187 mark_buffer_dirty(bh);
188 brelse(bh);
189
190 if (bi->i_dsk_ino) {
191 if (bi->i_sblock)
192 info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
193 info->si_freei++;
194 clear_bit(ino, info->si_imap);
195 dump_imap("delete_inode", s);
196 }
197
198 /*
199 * If this was the last file, make the previous block
200 * "last block of the last file" even if there is no
201 * real file there, saves us 1 gap.
202 */
203 if (info->si_lf_eblk == bi->i_eblock) {
204 info->si_lf_eblk = bi->i_sblock - 1;
205 mark_buffer_dirty(info->si_sbh);
206 }
207 unlock_kernel();
208 clear_inode(inode);
209 }
210
211 static void bfs_put_super(struct super_block *s)
212 {
213 struct bfs_sb_info *info = BFS_SB(s);
214 brelse(info->si_sbh);
215 kfree(info->si_imap);
216 kfree(info);
217 s->s_fs_info = NULL;
218 }
219
220 static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
221 {
222 struct super_block *s = dentry->d_sb;
223 struct bfs_sb_info *info = BFS_SB(s);
224 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
225 buf->f_type = BFS_MAGIC;
226 buf->f_bsize = s->s_blocksize;
227 buf->f_blocks = info->si_blocks;
228 buf->f_bfree = buf->f_bavail = info->si_freeb;
229 buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
230 buf->f_ffree = info->si_freei;
231 buf->f_fsid.val[0] = (u32)id;
232 buf->f_fsid.val[1] = (u32)(id >> 32);
233 buf->f_namelen = BFS_NAMELEN;
234 return 0;
235 }
236
237 static void bfs_write_super(struct super_block *s)
238 {
239 lock_kernel();
240 if (!(s->s_flags & MS_RDONLY))
241 mark_buffer_dirty(BFS_SB(s)->si_sbh);
242 s->s_dirt = 0;
243 unlock_kernel();
244 }
245
246 static struct kmem_cache *bfs_inode_cachep;
247
248 static struct inode *bfs_alloc_inode(struct super_block *sb)
249 {
250 struct bfs_inode_info *bi;
251 bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
252 if (!bi)
253 return NULL;
254 return &bi->vfs_inode;
255 }
256
257 static void bfs_destroy_inode(struct inode *inode)
258 {
259 kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
260 }
261
262 static void init_once(struct kmem_cache *cachep, void *foo)
263 {
264 struct bfs_inode_info *bi = foo;
265
266 inode_init_once(&bi->vfs_inode);
267 }
268
269 static int init_inodecache(void)
270 {
271 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
272 sizeof(struct bfs_inode_info),
273 0, (SLAB_RECLAIM_ACCOUNT|
274 SLAB_MEM_SPREAD),
275 init_once);
276 if (bfs_inode_cachep == NULL)
277 return -ENOMEM;
278 return 0;
279 }
280
281 static void destroy_inodecache(void)
282 {
283 kmem_cache_destroy(bfs_inode_cachep);
284 }
285
286 static const struct super_operations bfs_sops = {
287 .alloc_inode = bfs_alloc_inode,
288 .destroy_inode = bfs_destroy_inode,
289 .write_inode = bfs_write_inode,
290 .delete_inode = bfs_delete_inode,
291 .put_super = bfs_put_super,
292 .write_super = bfs_write_super,
293 .statfs = bfs_statfs,
294 };
295
296 void dump_imap(const char *prefix, struct super_block *s)
297 {
298 #ifdef DEBUG
299 int i;
300 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
301
302 if (!tmpbuf)
303 return;
304 for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
305 if (i > PAGE_SIZE - 100) break;
306 if (test_bit(i, BFS_SB(s)->si_imap))
307 strcat(tmpbuf, "1");
308 else
309 strcat(tmpbuf, "0");
310 }
311 printf("BFS-fs: %s: lasti=%08lx <%s>\n",
312 prefix, BFS_SB(s)->si_lasti, tmpbuf);
313 free_page((unsigned long)tmpbuf);
314 #endif
315 }
316
317 static int bfs_fill_super(struct super_block *s, void *data, int silent)
318 {
319 struct buffer_head *bh;
320 struct bfs_super_block *bfs_sb;
321 struct inode *inode;
322 unsigned i, imap_len;
323 struct bfs_sb_info *info;
324 long ret = -EINVAL;
325
326 info = kzalloc(sizeof(*info), GFP_KERNEL);
327 if (!info)
328 return -ENOMEM;
329 s->s_fs_info = info;
330
331 sb_set_blocksize(s, BFS_BSIZE);
332
333 bh = sb_bread(s, 0);
334 if(!bh)
335 goto out;
336 bfs_sb = (struct bfs_super_block *)bh->b_data;
337 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
338 if (!silent)
339 printf("No BFS filesystem on %s (magic=%08x)\n",
340 s->s_id, le32_to_cpu(bfs_sb->s_magic));
341 goto out;
342 }
343 if (BFS_UNCLEAN(bfs_sb, s) && !silent)
344 printf("%s is unclean, continuing\n", s->s_id);
345
346 s->s_magic = BFS_MAGIC;
347 info->si_sbh = bh;
348 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
349 sizeof(struct bfs_inode)
350 + BFS_ROOT_INO - 1;
351 imap_len = (info->si_lasti / 8) + 1;
352 info->si_imap = kzalloc(imap_len, GFP_KERNEL);
353 if (!info->si_imap)
354 goto out;
355 for (i = 0; i < BFS_ROOT_INO; i++)
356 set_bit(i, info->si_imap);
357
358 s->s_op = &bfs_sops;
359 inode = bfs_iget(s, BFS_ROOT_INO);
360 if (IS_ERR(inode)) {
361 ret = PTR_ERR(inode);
362 kfree(info->si_imap);
363 goto out;
364 }
365 s->s_root = d_alloc_root(inode);
366 if (!s->s_root) {
367 iput(inode);
368 ret = -ENOMEM;
369 kfree(info->si_imap);
370 goto out;
371 }
372
373 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
374 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
375 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
376 info->si_freei = 0;
377 info->si_lf_eblk = 0;
378 bh = NULL;
379 for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
380 struct bfs_inode *di;
381 int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
382 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
383 unsigned long sblock, eblock;
384
385 if (!off) {
386 brelse(bh);
387 bh = sb_bread(s, block);
388 }
389
390 if (!bh)
391 continue;
392
393 di = (struct bfs_inode *)bh->b_data + off;
394
395 if (!di->i_ino) {
396 info->si_freei++;
397 continue;
398 }
399 set_bit(i, info->si_imap);
400 info->si_freeb -= BFS_FILEBLOCKS(di);
401
402 sblock = le32_to_cpu(di->i_sblock);
403 eblock = le32_to_cpu(di->i_eblock);
404 if (eblock > info->si_lf_eblk)
405 info->si_lf_eblk = eblock;
406 }
407 brelse(bh);
408 if (!(s->s_flags & MS_RDONLY)) {
409 mark_buffer_dirty(info->si_sbh);
410 s->s_dirt = 1;
411 }
412 dump_imap("read_super", s);
413 return 0;
414
415 out:
416 brelse(bh);
417 kfree(info);
418 s->s_fs_info = NULL;
419 return ret;
420 }
421
422 static int bfs_get_sb(struct file_system_type *fs_type,
423 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
424 {
425 return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt);
426 }
427
428 static struct file_system_type bfs_fs_type = {
429 .owner = THIS_MODULE,
430 .name = "bfs",
431 .get_sb = bfs_get_sb,
432 .kill_sb = kill_block_super,
433 .fs_flags = FS_REQUIRES_DEV,
434 };
435
436 static int __init init_bfs_fs(void)
437 {
438 int err = init_inodecache();
439 if (err)
440 goto out1;
441 err = register_filesystem(&bfs_fs_type);
442 if (err)
443 goto out;
444 return 0;
445 out:
446 destroy_inodecache();
447 out1:
448 return err;
449 }
450
451 static void __exit exit_bfs_fs(void)
452 {
453 unregister_filesystem(&bfs_fs_type);
454 destroy_inodecache();
455 }
456
457 module_init(init_bfs_fs)
458 module_exit(exit_bfs_fs)
WRT350N Kernel Patches