1 /*
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.
6 */
7
8 #include <linux/module.h>
9 #include <linux/mm.h>
10 #include <linux/slab.h>
11 #include <linux/init.h>
12 #include <linux/locks.h>
13 #include <linux/bfs_fs.h>
14 #include <linux/smp_lock.h>
15
16 #include <asm/uaccess.h>
17
18 #include "bfs_defs.h"
19
20 MODULE_AUTHOR("Tigran A. Aivazian <tigran@veritas.com>");
21 MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux");
22 MODULE_LICENSE("GPL");
23 EXPORT_NO_SYMBOLS;
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
bfs_read_inode(struct inode * inode)35 static void bfs_read_inode(struct inode * inode)
36 {
37 unsigned long ino = inode->i_ino;
38 kdev_t dev = inode->i_dev;
39 struct bfs_inode * di;
40 struct buffer_head * bh;
41 int block, off;
42
43 if (ino < BFS_ROOT_INO || ino > inode->i_sb->su_lasti) {
44 printf("Bad inode number %s:%08lx\n", bdevname(dev), ino);
45 make_bad_inode(inode);
46 return;
47 }
48
49 block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
50 bh = sb_bread(inode->i_sb, block);
51 if (!bh) {
52 printf("Unable to read inode %s:%08lx\n", bdevname(dev), 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 & di->i_mode;
61 if (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 (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 inode->i_uid = di->i_uid;
73 inode->i_gid = di->i_gid;
74 inode->i_nlink = di->i_nlink;
75 inode->i_size = BFS_FILESIZE(di);
76 inode->i_blocks = BFS_FILEBLOCKS(di);
77 inode->i_blksize = PAGE_SIZE;
78 inode->i_atime = di->i_atime;
79 inode->i_mtime = di->i_mtime;
80 inode->i_ctime = di->i_ctime;
81 inode->iu_dsk_ino = di->i_ino; /* can be 0 so we store a copy */
82 inode->iu_sblock = di->i_sblock;
83 inode->iu_eblock = di->i_eblock;
84
85 brelse(bh);
86 }
87
bfs_write_inode(struct inode * inode,int unused)88 static void bfs_write_inode(struct inode * inode, int unused)
89 {
90 unsigned long ino = inode->i_ino;
91 kdev_t dev = inode->i_dev;
92 struct bfs_inode * di;
93 struct buffer_head * bh;
94 int block, off;
95
96 if (ino < BFS_ROOT_INO || ino > inode->i_sb->su_lasti) {
97 printf("Bad inode number %s:%08lx\n", bdevname(dev), ino);
98 return;
99 }
100
101 lock_kernel();
102 block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
103 bh = sb_bread(inode->i_sb, block);
104 if (!bh) {
105 printf("Unable to read inode %s:%08lx\n", bdevname(dev), ino);
106 unlock_kernel();
107 return;
108 }
109
110 off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK;
111 di = (struct bfs_inode *)bh->b_data + off;
112
113 if (inode->i_ino == BFS_ROOT_INO)
114 di->i_vtype = BFS_VDIR;
115 else
116 di->i_vtype = BFS_VREG;
117
118 di->i_ino = inode->i_ino;
119 di->i_mode = inode->i_mode;
120 di->i_uid = inode->i_uid;
121 di->i_gid = inode->i_gid;
122 di->i_nlink = inode->i_nlink;
123 di->i_atime = inode->i_atime;
124 di->i_mtime = inode->i_mtime;
125 di->i_ctime = inode->i_ctime;
126 di->i_sblock = inode->iu_sblock;
127 di->i_eblock = inode->iu_eblock;
128 di->i_eoffset = di->i_sblock * BFS_BSIZE + inode->i_size - 1;
129
130 mark_buffer_dirty(bh);
131 brelse(bh);
132 unlock_kernel();
133 }
134
bfs_delete_inode(struct inode * inode)135 static void bfs_delete_inode(struct inode * inode)
136 {
137 unsigned long ino = inode->i_ino;
138 kdev_t dev = inode->i_dev;
139 struct bfs_inode * di;
140 struct buffer_head * bh;
141 int block, off;
142 struct super_block * s = inode->i_sb;
143
144 dprintf("ino=%08lx\n", inode->i_ino);
145
146 if (inode->i_ino < BFS_ROOT_INO || inode->i_ino > inode->i_sb->su_lasti) {
147 printf("invalid ino=%08lx\n", inode->i_ino);
148 return;
149 }
150
151 inode->i_size = 0;
152 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
153 lock_kernel();
154 mark_inode_dirty(inode);
155 block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
156 bh = sb_bread(s, block);
157 if (!bh) {
158 printf("Unable to read inode %s:%08lx\n", bdevname(dev), ino);
159 unlock_kernel();
160 return;
161 }
162 off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK;
163 di = (struct bfs_inode *)bh->b_data + off;
164 if (di->i_ino) {
165 s->su_freeb += BFS_FILEBLOCKS(di);
166 s->su_freei++;
167 clear_bit(di->i_ino, s->su_imap);
168 dump_imap("delete_inode", s);
169 }
170 di->i_ino = 0;
171 di->i_sblock = 0;
172 mark_buffer_dirty(bh);
173 brelse(bh);
174
175 /* if this was the last file, make the previous
176 block "last files last block" even if there is no real file there,
177 saves us 1 gap */
178 if (s->su_lf_eblk == inode->iu_eblock) {
179 s->su_lf_eblk = inode->iu_sblock - 1;
180 mark_buffer_dirty(s->su_sbh);
181 }
182 unlock_kernel();
183 clear_inode(inode);
184 }
185
bfs_put_super(struct super_block * s)186 static void bfs_put_super(struct super_block *s)
187 {
188 brelse(s->su_sbh);
189 kfree(s->su_imap);
190 }
191
bfs_statfs(struct super_block * s,struct statfs * buf)192 static int bfs_statfs(struct super_block *s, struct statfs *buf)
193 {
194 buf->f_type = BFS_MAGIC;
195 buf->f_bsize = s->s_blocksize;
196 buf->f_blocks = s->su_blocks;
197 buf->f_bfree = buf->f_bavail = s->su_freeb;
198 buf->f_files = s->su_lasti + 1 - BFS_ROOT_INO;
199 buf->f_ffree = s->su_freei;
200 buf->f_fsid.val[0] = kdev_t_to_nr(s->s_dev);
201 buf->f_namelen = BFS_NAMELEN;
202 return 0;
203 }
204
bfs_write_super(struct super_block * s)205 static void bfs_write_super(struct super_block *s)
206 {
207 if (!(s->s_flags & MS_RDONLY))
208 mark_buffer_dirty(s->su_sbh);
209 s->s_dirt = 0;
210 }
211
212 static struct super_operations bfs_sops = {
213 read_inode: bfs_read_inode,
214 write_inode: bfs_write_inode,
215 delete_inode: bfs_delete_inode,
216 put_super: bfs_put_super,
217 write_super: bfs_write_super,
218 statfs: bfs_statfs,
219 };
220
dump_imap(const char * prefix,struct super_block * s)221 void dump_imap(const char *prefix, struct super_block * s)
222 {
223 #if 0
224 int i;
225 char *tmpbuf = (char *)get_free_page(GFP_KERNEL);
226
227 if (!tmpbuf)
228 return;
229 for (i=s->su_lasti; i>=0; i--) {
230 if (i>PAGE_SIZE-100) break;
231 if (test_bit(i, s->su_imap))
232 strcat(tmpbuf, "1");
233 else
234 strcat(tmpbuf, "0");
235 }
236 printk(KERN_ERR "BFS-fs: %s: lasti=%08lx <%s>\n", prefix, s->su_lasti, tmpbuf);
237 free_page((unsigned long)tmpbuf);
238 #endif
239 }
240
bfs_read_super(struct super_block * s,void * data,int silent)241 static struct super_block * bfs_read_super(struct super_block * s,
242 void * data, int silent)
243 {
244 kdev_t dev;
245 struct buffer_head * bh;
246 struct bfs_super_block * bfs_sb;
247 struct inode * inode;
248 int i, imap_len;
249
250 dev = s->s_dev;
251 set_blocksize(dev, BFS_BSIZE);
252 s->s_blocksize = BFS_BSIZE;
253 s->s_blocksize_bits = BFS_BSIZE_BITS;
254
255 bh = sb_bread(s, 0);
256 if(!bh)
257 goto out;
258 bfs_sb = (struct bfs_super_block *)bh->b_data;
259 if (bfs_sb->s_magic != BFS_MAGIC) {
260 if (!silent)
261 printf("No BFS filesystem on %s (magic=%08x)\n",
262 bdevname(dev), bfs_sb->s_magic);
263 goto out;
264 }
265 if (BFS_UNCLEAN(bfs_sb, s) && !silent)
266 printf("%s is unclean, continuing\n", bdevname(dev));
267
268 s->s_magic = BFS_MAGIC;
269 s->su_bfs_sb = bfs_sb;
270 s->su_sbh = bh;
271 s->su_lasti = (bfs_sb->s_start - BFS_BSIZE)/sizeof(struct bfs_inode)
272 + BFS_ROOT_INO - 1;
273
274 imap_len = s->su_lasti/8 + 1;
275 s->su_imap = kmalloc(imap_len, GFP_KERNEL);
276 if (!s->su_imap)
277 goto out;
278 memset(s->su_imap, 0, imap_len);
279 for (i=0; i<BFS_ROOT_INO; i++)
280 set_bit(i, s->su_imap);
281
282 s->s_op = &bfs_sops;
283 inode = iget(s, BFS_ROOT_INO);
284 if (!inode) {
285 kfree(s->su_imap);
286 goto out;
287 }
288 s->s_root = d_alloc_root(inode);
289 if (!s->s_root) {
290 iput(inode);
291 kfree(s->su_imap);
292 goto out;
293 }
294
295 s->su_blocks = (bfs_sb->s_end + 1)>>BFS_BSIZE_BITS; /* for statfs(2) */
296 s->su_freeb = (bfs_sb->s_end + 1 - bfs_sb->s_start)>>BFS_BSIZE_BITS;
297 s->su_freei = 0;
298 s->su_lf_eblk = 0;
299 s->su_lf_sblk = 0;
300 s->su_lf_ioff = 0;
301 for (i=BFS_ROOT_INO; i<=s->su_lasti; i++) {
302 inode = iget(s,i);
303 if (inode->iu_dsk_ino == 0)
304 s->su_freei++;
305 else {
306 set_bit(i, s->su_imap);
307 s->su_freeb -= inode->i_blocks;
308 if (inode->iu_eblock > s->su_lf_eblk) {
309 s->su_lf_eblk = inode->iu_eblock;
310 s->su_lf_sblk = inode->iu_sblock;
311 s->su_lf_ioff = BFS_INO2OFF(i);
312 }
313 }
314 iput(inode);
315 }
316 if (!(s->s_flags & MS_RDONLY)) {
317 mark_buffer_dirty(bh);
318 s->s_dirt = 1;
319 }
320 dump_imap("read_super", s);
321 return s;
322
323 out:
324 brelse(bh);
325 return NULL;
326 }
327
328 static DECLARE_FSTYPE_DEV(bfs_fs_type, "bfs", bfs_read_super);
329
init_bfs_fs(void)330 static int __init init_bfs_fs(void)
331 {
332 return register_filesystem(&bfs_fs_type);
333 }
334
exit_bfs_fs(void)335 static void __exit exit_bfs_fs(void)
336 {
337 unregister_filesystem(&bfs_fs_type);
338 }
339
340 module_init(init_bfs_fs)
341 module_exit(exit_bfs_fs)
342