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generic: add __FINITDATA
[wrt350n-kernel.git] / fs / bfs / inode.c
bloba64a71d444f50f5d2e0731f375c9994551780743
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,
52 ino);
53 make_bad_inode(inode);
54 return;
55 }
56
57 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
58 di = (struct bfs_inode *)bh->b_data + off;
59
60 inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
61 if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
62 inode->i_mode |= S_IFDIR;
63 inode->i_op = &bfs_dir_inops;
64 inode->i_fop = &bfs_dir_operations;
65 } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) {
66 inode->i_mode |= S_IFREG;
67 inode->i_op = &bfs_file_inops;
68 inode->i_fop = &bfs_file_operations;
69 inode->i_mapping->a_ops = &bfs_aops;
70 }
71
72 BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock);
73 BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock);
74 BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino);
75 inode->i_uid = le32_to_cpu(di->i_uid);
76 inode->i_gid = le32_to_cpu(di->i_gid);
77 inode->i_nlink = le32_to_cpu(di->i_nlink);
78 inode->i_size = BFS_FILESIZE(di);
79 inode->i_blocks = BFS_FILEBLOCKS(di);
80 inode->i_atime.tv_sec = le32_to_cpu(di->i_atime);
81 inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime);
82 inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime);
83 inode->i_atime.tv_nsec = 0;
84 inode->i_mtime.tv_nsec = 0;
85 inode->i_ctime.tv_nsec = 0;
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",
110 inode->i_sb->s_id, ino);
111 unlock_kernel();
112 return -EIO;
113 }
114
115 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
116 di = (struct bfs_inode *)bh->b_data + off;
117
118 if (ino == BFS_ROOT_INO)
119 di->i_vtype = cpu_to_le32(BFS_VDIR);
120 else
121 di->i_vtype = cpu_to_le32(BFS_VREG);
122
123 di->i_ino = cpu_to_le16(ino);
124 di->i_mode = cpu_to_le32(inode->i_mode);
125 di->i_uid = cpu_to_le32(inode->i_uid);
126 di->i_gid = cpu_to_le32(inode->i_gid);
127 di->i_nlink = cpu_to_le32(inode->i_nlink);
128 di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
129 di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
130 di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
131 i_sblock = BFS_I(inode)->i_sblock;
132 di->i_sblock = cpu_to_le32(i_sblock);
133 di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
134 di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
135
136 mark_buffer_dirty(bh);
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
166 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
167 bh = sb_bread(s, block);
168 if (!bh) {
169 printf("Unable to read inode %s:%08lx\n",
170 inode->i_sb->s_id, ino);
171 unlock_kernel();
172 return;
173 }
174 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
175 di = (struct bfs_inode *)bh->b_data + off;
176 memset((void *)di, 0, sizeof(struct bfs_inode));
177 mark_buffer_dirty(bh);
178 brelse(bh);
179
180 if (bi->i_dsk_ino) {
181 if (bi->i_sblock)
182 info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
183 info->si_freei++;
184 clear_bit(ino, info->si_imap);
185 dump_imap("delete_inode", s);
186 }
187
188 /*
189 * If this was the last file, make the previous block
190 * "last block of the last file" even if there is no
191 * real file there, saves us 1 gap.
192 */
193 if (info->si_lf_eblk == bi->i_eblock) {
194 info->si_lf_eblk = bi->i_sblock - 1;
195 mark_buffer_dirty(info->si_sbh);
196 }
197 unlock_kernel();
198 clear_inode(inode);
199 }
200
201 static void bfs_put_super(struct super_block *s)
202 {
203 struct bfs_sb_info *info = BFS_SB(s);
204 brelse(info->si_sbh);
205 kfree(info->si_imap);
206 kfree(info);
207 s->s_fs_info = NULL;
208 }
209
210 static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
211 {
212 struct super_block *s = dentry->d_sb;
213 struct bfs_sb_info *info = BFS_SB(s);
214 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
215 buf->f_type = BFS_MAGIC;
216 buf->f_bsize = s->s_blocksize;
217 buf->f_blocks = info->si_blocks;
218 buf->f_bfree = buf->f_bavail = info->si_freeb;
219 buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
220 buf->f_ffree = info->si_freei;
221 buf->f_fsid.val[0] = (u32)id;
222 buf->f_fsid.val[1] = (u32)(id >> 32);
223 buf->f_namelen = BFS_NAMELEN;
224 return 0;
225 }
226
227 static void bfs_write_super(struct super_block *s)
228 {
229 lock_kernel();
230 if (!(s->s_flags & MS_RDONLY))
231 mark_buffer_dirty(BFS_SB(s)->si_sbh);
232 s->s_dirt = 0;
233 unlock_kernel();
234 }
235
236 static struct kmem_cache *bfs_inode_cachep;
237
238 static struct inode *bfs_alloc_inode(struct super_block *sb)
239 {
240 struct bfs_inode_info *bi;
241 bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
242 if (!bi)
243 return NULL;
244 return &bi->vfs_inode;
245 }
246
247 static void bfs_destroy_inode(struct inode *inode)
248 {
249 kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
250 }
251
252 static void init_once(struct kmem_cache *cachep, void *foo)
253 {
254 struct bfs_inode_info *bi = foo;
255
256 inode_init_once(&bi->vfs_inode);
257 }
258
259 static int init_inodecache(void)
260 {
261 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
262 sizeof(struct bfs_inode_info),
263 0, (SLAB_RECLAIM_ACCOUNT|
264 SLAB_MEM_SPREAD),
265 init_once);
266 if (bfs_inode_cachep == NULL)
267 return -ENOMEM;
268 return 0;
269 }
270
271 static void destroy_inodecache(void)
272 {
273 kmem_cache_destroy(bfs_inode_cachep);
274 }
275
276 static const struct super_operations bfs_sops = {
277 .alloc_inode = bfs_alloc_inode,
278 .destroy_inode = bfs_destroy_inode,
279 .read_inode = bfs_read_inode,
280 .write_inode = bfs_write_inode,
281 .delete_inode = bfs_delete_inode,
282 .put_super = bfs_put_super,
283 .write_super = bfs_write_super,
284 .statfs = bfs_statfs,
285 };
286
287 void dump_imap(const char *prefix, struct super_block *s)
288 {
289 #ifdef DEBUG
290 int i;
291 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
292
293 if (!tmpbuf)
294 return;
295 for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
296 if (i > PAGE_SIZE - 100) break;
297 if (test_bit(i, BFS_SB(s)->si_imap))
298 strcat(tmpbuf, "1");
299 else
300 strcat(tmpbuf, "0");
301 }
302 printf("BFS-fs: %s: lasti=%08lx <%s>\n",
303 prefix, BFS_SB(s)->si_lasti, tmpbuf);
304 free_page((unsigned long)tmpbuf);
305 #endif
306 }
307
308 static int bfs_fill_super(struct super_block *s, void *data, int silent)
309 {
310 struct buffer_head *bh;
311 struct bfs_super_block *bfs_sb;
312 struct inode *inode;
313 unsigned i, imap_len;
314 struct bfs_sb_info *info;
315
316 info = kzalloc(sizeof(*info), GFP_KERNEL);
317 if (!info)
318 return -ENOMEM;
319 s->s_fs_info = info;
320
321 sb_set_blocksize(s, BFS_BSIZE);
322
323 bh = sb_bread(s, 0);
324 if(!bh)
325 goto out;
326 bfs_sb = (struct bfs_super_block *)bh->b_data;
327 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
328 if (!silent)
329 printf("No BFS filesystem on %s (magic=%08x)\n",
330 s->s_id, le32_to_cpu(bfs_sb->s_magic));
331 goto out;
332 }
333 if (BFS_UNCLEAN(bfs_sb, s) && !silent)
334 printf("%s is unclean, continuing\n", s->s_id);
335
336 s->s_magic = BFS_MAGIC;
337 info->si_sbh = bh;
338 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
339 sizeof(struct bfs_inode)
340 + BFS_ROOT_INO - 1;
341 imap_len = (info->si_lasti / 8) + 1;
342 info->si_imap = kzalloc(imap_len, GFP_KERNEL);
343 if (!info->si_imap)
344 goto out;
345 for (i = 0; i < BFS_ROOT_INO; i++)
346 set_bit(i, info->si_imap);
347
348 s->s_op = &bfs_sops;
349 inode = iget(s, BFS_ROOT_INO);
350 if (!inode) {
351 kfree(info->si_imap);
352 goto out;
353 }
354 s->s_root = d_alloc_root(inode);
355 if (!s->s_root) {
356 iput(inode);
357 kfree(info->si_imap);
358 goto out;
359 }
360
361 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
362 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
363 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
364 info->si_freei = 0;
365 info->si_lf_eblk = 0;
366 bh = NULL;
367 for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
368 struct bfs_inode *di;
369 int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
370 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
371 unsigned long sblock, eblock;
372
373 if (!off) {
374 brelse(bh);
375 bh = sb_bread(s, block);
376 }
377
378 if (!bh)
379 continue;
380
381 di = (struct bfs_inode *)bh->b_data + off;
382
383 if (!di->i_ino) {
384 info->si_freei++;
385 continue;
386 }
387 set_bit(i, info->si_imap);
388 info->si_freeb -= BFS_FILEBLOCKS(di);
389
390 sblock = le32_to_cpu(di->i_sblock);
391 eblock = le32_to_cpu(di->i_eblock);
392 if (eblock > info->si_lf_eblk)
393 info->si_lf_eblk = eblock;
394 }
395 brelse(bh);
396 if (!(s->s_flags & MS_RDONLY)) {
397 mark_buffer_dirty(info->si_sbh);
398 s->s_dirt = 1;
399 }
400 dump_imap("read_super", s);
401 return 0;
402
403 out:
404 brelse(bh);
405 kfree(info);
406 s->s_fs_info = NULL;
407 return -EINVAL;
408 }
409
410 static int bfs_get_sb(struct file_system_type *fs_type,
411 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
412 {
413 return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt);
414 }
415
416 static struct file_system_type bfs_fs_type = {
417 .owner = THIS_MODULE,
418 .name = "bfs",
419 .get_sb = bfs_get_sb,
420 .kill_sb = kill_block_super,
421 .fs_flags = FS_REQUIRES_DEV,
422 };
423
424 static int __init init_bfs_fs(void)
425 {
426 int err = init_inodecache();
427 if (err)
428 goto out1;
429 err = register_filesystem(&bfs_fs_type);
430 if (err)
431 goto out;
432 return 0;
433 out:
434 destroy_inodecache();
435 out1:
436 return err;
437 }
438
439 static void __exit exit_bfs_fs(void)
440 {
441 unregister_filesystem(&bfs_fs_type);
442 destroy_inodecache();
443 }
444
445 module_init(init_bfs_fs)
446 module_exit(exit_bfs_fs)
WRT350N Kernel Patches