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[XFS] Add infrastructure for tracking I/O completions
[usb.git] / fs / bfs / inode.c
blob64e0fb33fc0cacda1dec350ca523f9ee91d10e2a
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/fs.h>
13 #include <linux/smp_lock.h>
14 #include <linux/buffer_head.h>
15 #include <linux/vfs.h>
16 #include <asm/uaccess.h>
17 #include "bfs.h"
18
19 MODULE_AUTHOR("Tigran A. Aivazian <tigran@veritas.com>");
20 MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux");
21 MODULE_LICENSE("GPL");
22
23 #undef DEBUG
24
25 #ifdef DEBUG
26 #define dprintf(x...) printf(x)
27 #else
28 #define dprintf(x...)
29 #endif
30
31 void dump_imap(const char *prefix, struct super_block * s);
32
33 static void bfs_read_inode(struct inode * inode)
34 {
35 unsigned long ino = inode->i_ino;
36 struct bfs_inode * di;
37 struct buffer_head * bh;
38 int block, off;
39
40 if (ino < BFS_ROOT_INO || ino > BFS_SB(inode->i_sb)->si_lasti) {
41 printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
42 make_bad_inode(inode);
43 return;
44 }
45
46 block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
47 bh = sb_bread(inode->i_sb, block);
48 if (!bh) {
49 printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino);
50 make_bad_inode(inode);
51 return;
52 }
53
54 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
55 di = (struct bfs_inode *)bh->b_data + off;
56
57 inode->i_mode = 0x0000FFFF & di->i_mode;
58 if (di->i_vtype == BFS_VDIR) {
59 inode->i_mode |= S_IFDIR;
60 inode->i_op = &bfs_dir_inops;
61 inode->i_fop = &bfs_dir_operations;
62 } else if (di->i_vtype == BFS_VREG) {
63 inode->i_mode |= S_IFREG;
64 inode->i_op = &bfs_file_inops;
65 inode->i_fop = &bfs_file_operations;
66 inode->i_mapping->a_ops = &bfs_aops;
67 }
68
69 inode->i_uid = di->i_uid;
70 inode->i_gid = di->i_gid;
71 inode->i_nlink = di->i_nlink;
72 inode->i_size = BFS_FILESIZE(di);
73 inode->i_blocks = BFS_FILEBLOCKS(di);
74 inode->i_blksize = PAGE_SIZE;
75 inode->i_atime.tv_sec = di->i_atime;
76 inode->i_mtime.tv_sec = di->i_mtime;
77 inode->i_ctime.tv_sec = di->i_ctime;
78 inode->i_atime.tv_nsec = 0;
79 inode->i_mtime.tv_nsec = 0;
80 inode->i_ctime.tv_nsec = 0;
81 BFS_I(inode)->i_dsk_ino = di->i_ino; /* can be 0 so we store a copy */
82 BFS_I(inode)->i_sblock = di->i_sblock;
83 BFS_I(inode)->i_eblock = di->i_eblock;
84
85 brelse(bh);
86 }
87
88 static int bfs_write_inode(struct inode * inode, int unused)
89 {
90 unsigned long ino = inode->i_ino;
91 struct bfs_inode * di;
92 struct buffer_head * bh;
93 int block, off;
94
95 if (ino < BFS_ROOT_INO || ino > BFS_SB(inode->i_sb)->si_lasti) {
96 printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
97 return -EIO;
98 }
99
100 lock_kernel();
101 block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
102 bh = sb_bread(inode->i_sb, block);
103 if (!bh) {
104 printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino);
105 unlock_kernel();
106 return -EIO;
107 }
108
109 off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK;
110 di = (struct bfs_inode *)bh->b_data + off;
111
112 if (inode->i_ino == BFS_ROOT_INO)
113 di->i_vtype = BFS_VDIR;
114 else
115 di->i_vtype = BFS_VREG;
116
117 di->i_ino = inode->i_ino;
118 di->i_mode = inode->i_mode;
119 di->i_uid = inode->i_uid;
120 di->i_gid = inode->i_gid;
121 di->i_nlink = inode->i_nlink;
122 di->i_atime = inode->i_atime.tv_sec;
123 di->i_mtime = inode->i_mtime.tv_sec;
124 di->i_ctime = inode->i_ctime.tv_sec;
125 di->i_sblock = BFS_I(inode)->i_sblock;
126 di->i_eblock = BFS_I(inode)->i_eblock;
127 di->i_eoffset = di->i_sblock * BFS_BSIZE + inode->i_size - 1;
128
129 mark_buffer_dirty(bh);
130 brelse(bh);
131 unlock_kernel();
132 return 0;
133 }
134
135 static void bfs_delete_inode(struct inode * inode)
136 {
137 unsigned long ino = inode->i_ino;
138 struct bfs_inode * di;
139 struct buffer_head * bh;
140 int block, off;
141 struct super_block * s = inode->i_sb;
142 struct bfs_sb_info * info = BFS_SB(s);
143
144 dprintf("ino=%08lx\n", inode->i_ino);
145
146 if (inode->i_ino < BFS_ROOT_INO || inode->i_ino > info->si_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_SEC;
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", inode->i_sb->s_id, 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 info->si_freeb += BFS_FILEBLOCKS(di);
166 info->si_freei++;
167 clear_bit(di->i_ino, info->si_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 (info->si_lf_eblk == BFS_I(inode)->i_eblock) {
179 info->si_lf_eblk = BFS_I(inode)->i_sblock - 1;
180 mark_buffer_dirty(info->si_sbh);
181 }
182 unlock_kernel();
183 clear_inode(inode);
184 }
185
186 static void bfs_put_super(struct super_block *s)
187 {
188 struct bfs_sb_info *info = BFS_SB(s);
189 brelse(info->si_sbh);
190 kfree(info->si_imap);
191 kfree(info);
192 s->s_fs_info = NULL;
193 }
194
195 static int bfs_statfs(struct super_block *s, struct kstatfs *buf)
196 {
197 struct bfs_sb_info *info = BFS_SB(s);
198 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
199 buf->f_type = BFS_MAGIC;
200 buf->f_bsize = s->s_blocksize;
201 buf->f_blocks = info->si_blocks;
202 buf->f_bfree = buf->f_bavail = info->si_freeb;
203 buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
204 buf->f_ffree = info->si_freei;
205 buf->f_fsid.val[0] = (u32)id;
206 buf->f_fsid.val[1] = (u32)(id >> 32);
207 buf->f_namelen = BFS_NAMELEN;
208 return 0;
209 }
210
211 static void bfs_write_super(struct super_block *s)
212 {
213 lock_kernel();
214 if (!(s->s_flags & MS_RDONLY))
215 mark_buffer_dirty(BFS_SB(s)->si_sbh);
216 s->s_dirt = 0;
217 unlock_kernel();
218 }
219
220 static kmem_cache_t * bfs_inode_cachep;
221
222 static struct inode *bfs_alloc_inode(struct super_block *sb)
223 {
224 struct bfs_inode_info *bi;
225 bi = kmem_cache_alloc(bfs_inode_cachep, SLAB_KERNEL);
226 if (!bi)
227 return NULL;
228 return &bi->vfs_inode;
229 }
230
231 static void bfs_destroy_inode(struct inode *inode)
232 {
233 kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
234 }
235
236 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
237 {
238 struct bfs_inode_info *bi = foo;
239
240 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
241 SLAB_CTOR_CONSTRUCTOR)
242 inode_init_once(&bi->vfs_inode);
243 }
244
245 static int init_inodecache(void)
246 {
247 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
248 sizeof(struct bfs_inode_info),
249 0, SLAB_RECLAIM_ACCOUNT,
250 init_once, NULL);
251 if (bfs_inode_cachep == NULL)
252 return -ENOMEM;
253 return 0;
254 }
255
256 static void destroy_inodecache(void)
257 {
258 if (kmem_cache_destroy(bfs_inode_cachep))
259 printk(KERN_INFO "bfs_inode_cache: not all structures were freed\n");
260 }
261
262 static struct super_operations bfs_sops = {
263 .alloc_inode = bfs_alloc_inode,
264 .destroy_inode = bfs_destroy_inode,
265 .read_inode = bfs_read_inode,
266 .write_inode = bfs_write_inode,
267 .delete_inode = bfs_delete_inode,
268 .put_super = bfs_put_super,
269 .write_super = bfs_write_super,
270 .statfs = bfs_statfs,
271 };
272
273 void dump_imap(const char *prefix, struct super_block * s)
274 {
275 #if 0
276 int i;
277 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
278
279 if (!tmpbuf)
280 return;
281 for (i=BFS_SB(s)->si_lasti; i>=0; i--) {
282 if (i>PAGE_SIZE-100) break;
283 if (test_bit(i, BFS_SB(s)->si_imap))
284 strcat(tmpbuf, "1");
285 else
286 strcat(tmpbuf, "0");
287 }
288 printk(KERN_ERR "BFS-fs: %s: lasti=%08lx <%s>\n", prefix, BFS_SB(s)->si_lasti, tmpbuf);
289 free_page((unsigned long)tmpbuf);
290 #endif
291 }
292
293 static int bfs_fill_super(struct super_block *s, void *data, int silent)
294 {
295 struct buffer_head * bh;
296 struct bfs_super_block * bfs_sb;
297 struct inode * inode;
298 int i, imap_len;
299 struct bfs_sb_info * info;
300
301 info = kmalloc(sizeof(*info), GFP_KERNEL);
302 if (!info)
303 return -ENOMEM;
304 s->s_fs_info = info;
305 memset(info, 0, sizeof(*info));
306
307 sb_set_blocksize(s, BFS_BSIZE);
308
309 bh = sb_bread(s, 0);
310 if(!bh)
311 goto out;
312 bfs_sb = (struct bfs_super_block *)bh->b_data;
313 if (bfs_sb->s_magic != BFS_MAGIC) {
314 if (!silent)
315 printf("No BFS filesystem on %s (magic=%08x)\n",
316 s->s_id, bfs_sb->s_magic);
317 goto out;
318 }
319 if (BFS_UNCLEAN(bfs_sb, s) && !silent)
320 printf("%s is unclean, continuing\n", s->s_id);
321
322 s->s_magic = BFS_MAGIC;
323 info->si_bfs_sb = bfs_sb;
324 info->si_sbh = bh;
325 info->si_lasti = (bfs_sb->s_start - BFS_BSIZE)/sizeof(struct bfs_inode)
326 + BFS_ROOT_INO - 1;
327
328 imap_len = info->si_lasti/8 + 1;
329 info->si_imap = kmalloc(imap_len, GFP_KERNEL);
330 if (!info->si_imap)
331 goto out;
332 memset(info->si_imap, 0, imap_len);
333 for (i=0; i<BFS_ROOT_INO; i++)
334 set_bit(i, info->si_imap);
335
336 s->s_op = &bfs_sops;
337 inode = iget(s, BFS_ROOT_INO);
338 if (!inode) {
339 kfree(info->si_imap);
340 goto out;
341 }
342 s->s_root = d_alloc_root(inode);
343 if (!s->s_root) {
344 iput(inode);
345 kfree(info->si_imap);
346 goto out;
347 }
348
349 info->si_blocks = (bfs_sb->s_end + 1)>>BFS_BSIZE_BITS; /* for statfs(2) */
350 info->si_freeb = (bfs_sb->s_end + 1 - bfs_sb->s_start)>>BFS_BSIZE_BITS;
351 info->si_freei = 0;
352 info->si_lf_eblk = 0;
353 info->si_lf_sblk = 0;
354 info->si_lf_ioff = 0;
355 for (i=BFS_ROOT_INO; i<=info->si_lasti; i++) {
356 inode = iget(s,i);
357 if (BFS_I(inode)->i_dsk_ino == 0)
358 info->si_freei++;
359 else {
360 set_bit(i, info->si_imap);
361 info->si_freeb -= inode->i_blocks;
362 if (BFS_I(inode)->i_eblock > info->si_lf_eblk) {
363 info->si_lf_eblk = BFS_I(inode)->i_eblock;
364 info->si_lf_sblk = BFS_I(inode)->i_sblock;
365 info->si_lf_ioff = BFS_INO2OFF(i);
366 }
367 }
368 iput(inode);
369 }
370 if (!(s->s_flags & MS_RDONLY)) {
371 mark_buffer_dirty(bh);
372 s->s_dirt = 1;
373 }
374 dump_imap("read_super", s);
375 return 0;
376
377 out:
378 brelse(bh);
379 kfree(info);
380 s->s_fs_info = NULL;
381 return -EINVAL;
382 }
383
384 static struct super_block *bfs_get_sb(struct file_system_type *fs_type,
385 int flags, const char *dev_name, void *data)
386 {
387 return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super);
388 }
389
390 static struct file_system_type bfs_fs_type = {
391 .owner = THIS_MODULE,
392 .name = "bfs",
393 .get_sb = bfs_get_sb,
394 .kill_sb = kill_block_super,
395 .fs_flags = FS_REQUIRES_DEV,
396 };
397
398 static int __init init_bfs_fs(void)
399 {
400 int err = init_inodecache();
401 if (err)
402 goto out1;
403 err = register_filesystem(&bfs_fs_type);
404 if (err)
405 goto out;
406 return 0;
407 out:
408 destroy_inodecache();
409 out1:
410 return err;
411 }
412
413 static void __exit exit_bfs_fs(void)
414 {
415 unregister_filesystem(&bfs_fs_type);
416 destroy_inodecache();
417 }
418
419 module_init(init_bfs_fs)
420 module_exit(exit_bfs_fs)
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