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add releasepage hooks to block devices which can be used by file systems
[linux-2.6/mini2440.git] / fs / bfs / inode.c
blob0ed57b5ee012c362fe298f7b7be24cfd49121e2d
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 struct bfs_sb_info *info = BFS_SB(inode->i_sb);
108
109 dprintf("ino=%08x\n", ino);
110
111 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
112 printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino);
113 return -EIO;
114 }
115
116 mutex_lock(&info->bfs_lock);
117 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
118 bh = sb_bread(inode->i_sb, block);
119 if (!bh) {
120 printf("Unable to read inode %s:%08x\n",
121 inode->i_sb->s_id, ino);
122 mutex_unlock(&info->bfs_lock);
123 return -EIO;
124 }
125
126 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
127 di = (struct bfs_inode *)bh->b_data + off;
128
129 if (ino == BFS_ROOT_INO)
130 di->i_vtype = cpu_to_le32(BFS_VDIR);
131 else
132 di->i_vtype = cpu_to_le32(BFS_VREG);
133
134 di->i_ino = cpu_to_le16(ino);
135 di->i_mode = cpu_to_le32(inode->i_mode);
136 di->i_uid = cpu_to_le32(inode->i_uid);
137 di->i_gid = cpu_to_le32(inode->i_gid);
138 di->i_nlink = cpu_to_le32(inode->i_nlink);
139 di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
140 di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
141 di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
142 i_sblock = BFS_I(inode)->i_sblock;
143 di->i_sblock = cpu_to_le32(i_sblock);
144 di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
145 di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
146
147 mark_buffer_dirty(bh);
148 brelse(bh);
149 mutex_unlock(&info->bfs_lock);
150 return 0;
151 }
152
153 static void bfs_delete_inode(struct inode *inode)
154 {
155 unsigned long ino = inode->i_ino;
156 struct bfs_inode *di;
157 struct buffer_head *bh;
158 int block, off;
159 struct super_block *s = inode->i_sb;
160 struct bfs_sb_info *info = BFS_SB(s);
161 struct bfs_inode_info *bi = BFS_I(inode);
162
163 dprintf("ino=%08lx\n", ino);
164
165 truncate_inode_pages(&inode->i_data, 0);
166
167 if ((ino < BFS_ROOT_INO) || (ino > info->si_lasti)) {
168 printf("invalid ino=%08lx\n", ino);
169 return;
170 }
171
172 inode->i_size = 0;
173 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
174 mutex_lock(&info->bfs_lock);
175 mark_inode_dirty(inode);
176
177 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
178 bh = sb_bread(s, block);
179 if (!bh) {
180 printf("Unable to read inode %s:%08lx\n",
181 inode->i_sb->s_id, ino);
182 mutex_unlock(&info->bfs_lock);
183 return;
184 }
185 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
186 di = (struct bfs_inode *)bh->b_data + off;
187 memset((void *)di, 0, sizeof(struct bfs_inode));
188 mark_buffer_dirty(bh);
189 brelse(bh);
190
191 if (bi->i_dsk_ino) {
192 if (bi->i_sblock)
193 info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
194 info->si_freei++;
195 clear_bit(ino, info->si_imap);
196 dump_imap("delete_inode", s);
197 }
198
199 /*
200 * If this was the last file, make the previous block
201 * "last block of the last file" even if there is no
202 * real file there, saves us 1 gap.
203 */
204 if (info->si_lf_eblk == bi->i_eblock) {
205 info->si_lf_eblk = bi->i_sblock - 1;
206 mark_buffer_dirty(info->si_sbh);
207 }
208 mutex_unlock(&info->bfs_lock);
209 clear_inode(inode);
210 }
211
212 static void bfs_put_super(struct super_block *s)
213 {
214 struct bfs_sb_info *info = BFS_SB(s);
215
216 brelse(info->si_sbh);
217 mutex_destroy(&info->bfs_lock);
218 kfree(info->si_imap);
219 kfree(info);
220 s->s_fs_info = NULL;
221 }
222
223 static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
224 {
225 struct super_block *s = dentry->d_sb;
226 struct bfs_sb_info *info = BFS_SB(s);
227 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
228 buf->f_type = BFS_MAGIC;
229 buf->f_bsize = s->s_blocksize;
230 buf->f_blocks = info->si_blocks;
231 buf->f_bfree = buf->f_bavail = info->si_freeb;
232 buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
233 buf->f_ffree = info->si_freei;
234 buf->f_fsid.val[0] = (u32)id;
235 buf->f_fsid.val[1] = (u32)(id >> 32);
236 buf->f_namelen = BFS_NAMELEN;
237 return 0;
238 }
239
240 static void bfs_write_super(struct super_block *s)
241 {
242 struct bfs_sb_info *info = BFS_SB(s);
243
244 mutex_lock(&info->bfs_lock);
245 if (!(s->s_flags & MS_RDONLY))
246 mark_buffer_dirty(info->si_sbh);
247 s->s_dirt = 0;
248 mutex_unlock(&info->bfs_lock);
249 }
250
251 static struct kmem_cache *bfs_inode_cachep;
252
253 static struct inode *bfs_alloc_inode(struct super_block *sb)
254 {
255 struct bfs_inode_info *bi;
256 bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
257 if (!bi)
258 return NULL;
259 return &bi->vfs_inode;
260 }
261
262 static void bfs_destroy_inode(struct inode *inode)
263 {
264 kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
265 }
266
267 static void init_once(void *foo)
268 {
269 struct bfs_inode_info *bi = foo;
270
271 inode_init_once(&bi->vfs_inode);
272 }
273
274 static int init_inodecache(void)
275 {
276 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
277 sizeof(struct bfs_inode_info),
278 0, (SLAB_RECLAIM_ACCOUNT|
279 SLAB_MEM_SPREAD),
280 init_once);
281 if (bfs_inode_cachep == NULL)
282 return -ENOMEM;
283 return 0;
284 }
285
286 static void destroy_inodecache(void)
287 {
288 kmem_cache_destroy(bfs_inode_cachep);
289 }
290
291 static const struct super_operations bfs_sops = {
292 .alloc_inode = bfs_alloc_inode,
293 .destroy_inode = bfs_destroy_inode,
294 .write_inode = bfs_write_inode,
295 .delete_inode = bfs_delete_inode,
296 .put_super = bfs_put_super,
297 .write_super = bfs_write_super,
298 .statfs = bfs_statfs,
299 };
300
301 void dump_imap(const char *prefix, struct super_block *s)
302 {
303 #ifdef DEBUG
304 int i;
305 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
306
307 if (!tmpbuf)
308 return;
309 for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
310 if (i > PAGE_SIZE - 100) break;
311 if (test_bit(i, BFS_SB(s)->si_imap))
312 strcat(tmpbuf, "1");
313 else
314 strcat(tmpbuf, "0");
315 }
316 printf("BFS-fs: %s: lasti=%08lx <%s>\n",
317 prefix, BFS_SB(s)->si_lasti, tmpbuf);
318 free_page((unsigned long)tmpbuf);
319 #endif
320 }
321
322 static int bfs_fill_super(struct super_block *s, void *data, int silent)
323 {
324 struct buffer_head *bh;
325 struct bfs_super_block *bfs_sb;
326 struct inode *inode;
327 unsigned i, imap_len;
328 struct bfs_sb_info *info;
329 long ret = -EINVAL;
330
331 info = kzalloc(sizeof(*info), GFP_KERNEL);
332 if (!info)
333 return -ENOMEM;
334 s->s_fs_info = info;
335
336 sb_set_blocksize(s, BFS_BSIZE);
337
338 bh = sb_bread(s, 0);
339 if(!bh)
340 goto out;
341 bfs_sb = (struct bfs_super_block *)bh->b_data;
342 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
343 if (!silent)
344 printf("No BFS filesystem on %s (magic=%08x)\n",
345 s->s_id, le32_to_cpu(bfs_sb->s_magic));
346 goto out;
347 }
348 if (BFS_UNCLEAN(bfs_sb, s) && !silent)
349 printf("%s is unclean, continuing\n", s->s_id);
350
351 s->s_magic = BFS_MAGIC;
352 info->si_sbh = bh;
353 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
354 sizeof(struct bfs_inode)
355 + BFS_ROOT_INO - 1;
356 imap_len = (info->si_lasti / 8) + 1;
357 info->si_imap = kzalloc(imap_len, GFP_KERNEL);
358 if (!info->si_imap)
359 goto out;
360 for (i = 0; i < BFS_ROOT_INO; i++)
361 set_bit(i, info->si_imap);
362
363 s->s_op = &bfs_sops;
364 inode = bfs_iget(s, BFS_ROOT_INO);
365 if (IS_ERR(inode)) {
366 ret = PTR_ERR(inode);
367 kfree(info->si_imap);
368 goto out;
369 }
370 s->s_root = d_alloc_root(inode);
371 if (!s->s_root) {
372 iput(inode);
373 ret = -ENOMEM;
374 kfree(info->si_imap);
375 goto out;
376 }
377
378 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
379 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
380 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
381 info->si_freei = 0;
382 info->si_lf_eblk = 0;
383 bh = NULL;
384 for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
385 struct bfs_inode *di;
386 int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
387 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
388 unsigned long eblock;
389
390 if (!off) {
391 brelse(bh);
392 bh = sb_bread(s, block);
393 }
394
395 if (!bh)
396 continue;
397
398 di = (struct bfs_inode *)bh->b_data + off;
399
400 if (!di->i_ino) {
401 info->si_freei++;
402 continue;
403 }
404 set_bit(i, info->si_imap);
405 info->si_freeb -= BFS_FILEBLOCKS(di);
406
407 eblock = le32_to_cpu(di->i_eblock);
408 if (eblock > info->si_lf_eblk)
409 info->si_lf_eblk = eblock;
410 }
411 brelse(bh);
412 if (!(s->s_flags & MS_RDONLY)) {
413 mark_buffer_dirty(info->si_sbh);
414 s->s_dirt = 1;
415 }
416 dump_imap("read_super", s);
417 mutex_init(&info->bfs_lock);
418 return 0;
419
420 out:
421 brelse(bh);
422 kfree(info);
423 s->s_fs_info = NULL;
424 return ret;
425 }
426
427 static int bfs_get_sb(struct file_system_type *fs_type,
428 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
429 {
430 return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt);
431 }
432
433 static struct file_system_type bfs_fs_type = {
434 .owner = THIS_MODULE,
435 .name = "bfs",
436 .get_sb = bfs_get_sb,
437 .kill_sb = kill_block_super,
438 .fs_flags = FS_REQUIRES_DEV,
439 };
440
441 static int __init init_bfs_fs(void)
442 {
443 int err = init_inodecache();
444 if (err)
445 goto out1;
446 err = register_filesystem(&bfs_fs_type);
447 if (err)
448 goto out;
449 return 0;
450 out:
451 destroy_inodecache();
452 out1:
453 return err;
454 }
455
456 static void __exit exit_bfs_fs(void)
457 {
458 unregister_filesystem(&bfs_fs_type);
459 destroy_inodecache();
460 }
461
462 module_init(init_bfs_fs)
463 module_exit(exit_bfs_fs)
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