blob: 3af6c73c5b5a69fe3831e6e8d6b588715f0dfb69 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/bfs/inode.c
3 * BFS superblock and inode operations.
4 * Copyright (C) 1999,2000 Tigran Aivazian <tigran@veritas.com>
5 * From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds.
Andrew Stribblehillfac92be2005-09-09 13:02:04 -07006 *
7 * Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005.
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 */
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
21MODULE_AUTHOR("Tigran A. Aivazian <tigran@veritas.com>");
22MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux");
23MODULE_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
33void dump_imap(const char *prefix, struct super_block * s);
34
35static 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
Andrew Stribblehillfac92be2005-09-09 13:02:04 -070059 inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
60 if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 inode->i_mode |= S_IFDIR;
62 inode->i_op = &bfs_dir_inops;
63 inode->i_fop = &bfs_dir_operations;
Andrew Stribblehillfac92be2005-09-09 13:02:04 -070064 } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 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
Andrew Stribblehillfac92be2005-09-09 13:02:04 -070071 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 inode->i_size = BFS_FILESIZE(di);
77 inode->i_blocks = BFS_FILEBLOCKS(di);
Andrew Stribblehillfac92be2005-09-09 13:02:04 -070078 if (inode->i_size || inode->i_blocks) dprintf("Registered inode with %lld size, %ld blocks\n", inode->i_size, inode->i_blocks);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 inode->i_blksize = PAGE_SIZE;
Andrew Stribblehillfac92be2005-09-09 13:02:04 -070080 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 inode->i_atime.tv_nsec = 0;
84 inode->i_mtime.tv_nsec = 0;
85 inode->i_ctime.tv_nsec = 0;
Andrew Stribblehillfac92be2005-09-09 13:02:04 -070086 BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); /* can be 0 so we store a copy */
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88 brelse(bh);
89}
90
91static int bfs_write_inode(struct inode * inode, int unused)
92{
Andrew Stribblehillfac92be2005-09-09 13:02:04 -070093 unsigned int ino = (u16)inode->i_ino;
94 unsigned long i_sblock;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 struct bfs_inode * di;
96 struct buffer_head * bh;
97 int block, off;
98
Andrew Stribblehillfac92be2005-09-09 13:02:04 -070099 dprintf("ino=%08x\n", ino);
100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 if (ino < BFS_ROOT_INO || ino > BFS_SB(inode->i_sb)->si_lasti) {
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700102 printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 return -EIO;
104 }
105
106 lock_kernel();
107 block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
108 bh = sb_bread(inode->i_sb, block);
109 if (!bh) {
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700110 printf("Unable to read inode %s:%08x\n", inode->i_sb->s_id, ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 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
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700118 if (ino == BFS_ROOT_INO)
119 di->i_vtype = cpu_to_le32(BFS_VDIR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 else
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700121 di->i_vtype = cpu_to_le32(BFS_VREG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700123 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
136 mark_buffer_dirty(bh);
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700137 dprintf("Written ino=%d into %d:%d\n",le16_to_cpu(di->i_ino),block,off);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 brelse(bh);
139 unlock_kernel();
140 return 0;
141}
142
143static void bfs_delete_inode(struct inode * inode)
144{
145 unsigned long ino = inode->i_ino;
146 struct bfs_inode * di;
147 struct buffer_head * bh;
148 int block, off;
149 struct super_block * s = inode->i_sb;
150 struct bfs_sb_info * info = BFS_SB(s);
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700151 struct bfs_inode_info * bi = BFS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700153 dprintf("ino=%08lx\n", ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
Mark Fashehfef26652005-09-09 13:01:31 -0700155 truncate_inode_pages(&inode->i_data, 0);
156
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700157 if (ino < BFS_ROOT_INO || ino > info->si_lasti) {
158 printf("invalid ino=%08lx\n", ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 return;
160 }
161
162 inode->i_size = 0;
163 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
164 lock_kernel();
165 mark_inode_dirty(inode);
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", inode->i_sb->s_id, ino);
170 unlock_kernel();
171 return;
172 }
173 off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK;
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700174 di = (struct bfs_inode *) bh->b_data + off;
175 if (bi->i_dsk_ino) {
176 info->si_freeb += 1 + bi->i_eblock - bi->i_sblock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 info->si_freei++;
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700178 clear_bit(ino, info->si_imap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 dump_imap("delete_inode", s);
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700180 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 di->i_ino = 0;
182 di->i_sblock = 0;
183 mark_buffer_dirty(bh);
184 brelse(bh);
185
186 /* if this was the last file, make the previous
187 block "last files last block" even if there is no real file there,
188 saves us 1 gap */
189 if (info->si_lf_eblk == BFS_I(inode)->i_eblock) {
190 info->si_lf_eblk = BFS_I(inode)->i_sblock - 1;
191 mark_buffer_dirty(info->si_sbh);
192 }
193 unlock_kernel();
194 clear_inode(inode);
195}
196
197static void bfs_put_super(struct super_block *s)
198{
199 struct bfs_sb_info *info = BFS_SB(s);
200 brelse(info->si_sbh);
201 kfree(info->si_imap);
202 kfree(info);
203 s->s_fs_info = NULL;
204}
205
206static int bfs_statfs(struct super_block *s, struct kstatfs *buf)
207{
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
222static 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
231static kmem_cache_t * bfs_inode_cachep;
232
233static struct inode *bfs_alloc_inode(struct super_block *sb)
234{
235 struct bfs_inode_info *bi;
236 bi = kmem_cache_alloc(bfs_inode_cachep, SLAB_KERNEL);
237 if (!bi)
238 return NULL;
239 return &bi->vfs_inode;
240}
241
242static void bfs_destroy_inode(struct inode *inode)
243{
244 kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
245}
246
247static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
248{
249 struct bfs_inode_info *bi = foo;
250
251 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
252 SLAB_CTOR_CONSTRUCTOR)
253 inode_init_once(&bi->vfs_inode);
254}
255
256static int init_inodecache(void)
257{
258 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
259 sizeof(struct bfs_inode_info),
260 0, SLAB_RECLAIM_ACCOUNT,
261 init_once, NULL);
262 if (bfs_inode_cachep == NULL)
263 return -ENOMEM;
264 return 0;
265}
266
267static void destroy_inodecache(void)
268{
269 if (kmem_cache_destroy(bfs_inode_cachep))
270 printk(KERN_INFO "bfs_inode_cache: not all structures were freed\n");
271}
272
273static struct super_operations bfs_sops = {
274 .alloc_inode = bfs_alloc_inode,
275 .destroy_inode = bfs_destroy_inode,
276 .read_inode = bfs_read_inode,
277 .write_inode = bfs_write_inode,
278 .delete_inode = bfs_delete_inode,
279 .put_super = bfs_put_super,
280 .write_super = bfs_write_super,
281 .statfs = bfs_statfs,
282};
283
284void dump_imap(const char *prefix, struct super_block * s)
285{
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700286#ifdef DEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 int i;
288 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
289
290 if (!tmpbuf)
291 return;
292 for (i=BFS_SB(s)->si_lasti; i>=0; i--) {
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700293 if (i > PAGE_SIZE-100) break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 if (test_bit(i, BFS_SB(s)->si_imap))
295 strcat(tmpbuf, "1");
296 else
297 strcat(tmpbuf, "0");
298 }
299 printk(KERN_ERR "BFS-fs: %s: lasti=%08lx <%s>\n", prefix, BFS_SB(s)->si_lasti, tmpbuf);
300 free_page((unsigned long)tmpbuf);
301#endif
302}
303
304static int bfs_fill_super(struct super_block *s, void *data, int silent)
305{
306 struct buffer_head * bh;
307 struct bfs_super_block * bfs_sb;
308 struct inode * inode;
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700309 unsigned i, imap_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 struct bfs_sb_info * info;
311
312 info = kmalloc(sizeof(*info), GFP_KERNEL);
313 if (!info)
314 return -ENOMEM;
315 s->s_fs_info = info;
316 memset(info, 0, sizeof(*info));
317
318 sb_set_blocksize(s, BFS_BSIZE);
319
320 bh = sb_bread(s, 0);
321 if(!bh)
322 goto out;
323 bfs_sb = (struct bfs_super_block *)bh->b_data;
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700324 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 if (!silent)
326 printf("No BFS filesystem on %s (magic=%08x)\n",
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700327 s->s_id, le32_to_cpu(bfs_sb->s_magic));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 goto out;
329 }
330 if (BFS_UNCLEAN(bfs_sb, s) && !silent)
331 printf("%s is unclean, continuing\n", s->s_id);
332
333 s->s_magic = BFS_MAGIC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 info->si_sbh = bh;
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700335 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE)/sizeof(struct bfs_inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 + BFS_ROOT_INO - 1;
337
338 imap_len = info->si_lasti/8 + 1;
339 info->si_imap = kmalloc(imap_len, GFP_KERNEL);
340 if (!info->si_imap)
341 goto out;
342 memset(info->si_imap, 0, imap_len);
343 for (i=0; i<BFS_ROOT_INO; i++)
344 set_bit(i, info->si_imap);
345
346 s->s_op = &bfs_sops;
347 inode = iget(s, BFS_ROOT_INO);
348 if (!inode) {
349 kfree(info->si_imap);
350 goto out;
351 }
352 s->s_root = d_alloc_root(inode);
353 if (!s->s_root) {
354 iput(inode);
355 kfree(info->si_imap);
356 goto out;
357 }
358
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700359 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1)>>BFS_BSIZE_BITS; /* for statfs(2) */
Alexey Dobriyance0fe7e2005-10-04 17:43:06 +0100360 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 - le32_to_cpu(bfs_sb->s_start))>>BFS_BSIZE_BITS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 info->si_freei = 0;
362 info->si_lf_eblk = 0;
363 info->si_lf_sblk = 0;
364 info->si_lf_ioff = 0;
Al Viroc2b513d2005-10-04 17:48:44 +0100365 bh = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 for (i=BFS_ROOT_INO; i<=info->si_lasti; i++) {
Al Viroc2b513d2005-10-04 17:48:44 +0100367 struct bfs_inode *di;
368 int block = (i - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
369 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
370 unsigned long sblock, eblock;
371
372 if (!off) {
373 brelse(bh);
374 bh = sb_bread(s, block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 }
Al Viroc2b513d2005-10-04 17:48:44 +0100376
377 if (!bh)
378 continue;
379
380 di = (struct bfs_inode *)bh->b_data + off;
381
382 if (!di->i_ino) {
383 info->si_freei++;
384 continue;
385 }
386 set_bit(i, info->si_imap);
387 info->si_freeb -= BFS_FILEBLOCKS(di);
388
389 sblock = le32_to_cpu(di->i_sblock);
390 eblock = le32_to_cpu(di->i_eblock);
391 if (eblock > info->si_lf_eblk) {
392 info->si_lf_eblk = eblock;
393 info->si_lf_sblk = sblock;
394 info->si_lf_ioff = BFS_INO2OFF(i);
395 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 }
Al Viroc2b513d2005-10-04 17:48:44 +0100397 brelse(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 if (!(s->s_flags & MS_RDONLY)) {
Al Viroc2b513d2005-10-04 17:48:44 +0100399 mark_buffer_dirty(info->si_sbh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 s->s_dirt = 1;
401 }
402 dump_imap("read_super", s);
403 return 0;
404
405out:
406 brelse(bh);
407 kfree(info);
408 s->s_fs_info = NULL;
409 return -EINVAL;
410}
411
412static struct super_block *bfs_get_sb(struct file_system_type *fs_type,
413 int flags, const char *dev_name, void *data)
414{
415 return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super);
416}
417
418static struct file_system_type bfs_fs_type = {
419 .owner = THIS_MODULE,
420 .name = "bfs",
421 .get_sb = bfs_get_sb,
422 .kill_sb = kill_block_super,
423 .fs_flags = FS_REQUIRES_DEV,
424};
425
426static int __init init_bfs_fs(void)
427{
428 int err = init_inodecache();
429 if (err)
430 goto out1;
431 err = register_filesystem(&bfs_fs_type);
432 if (err)
433 goto out;
434 return 0;
435out:
436 destroy_inodecache();
437out1:
438 return err;
439}
440
441static void __exit exit_bfs_fs(void)
442{
443 unregister_filesystem(&bfs_fs_type);
444 destroy_inodecache();
445}
446
447module_init(init_bfs_fs)
448module_exit(exit_bfs_fs)