Slab API: remove useless ctor parameter and reorder parameters
[linux-3.10.git] / fs / bfs / inode.c
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(struct kmem_cache *cachep, void *foo)
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)