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[TCP]: TCP_CONG_YEAH requires TCP_CONG_VEGAS
[linux-2.6/verdex.git] / fs / affs / super.c
blobb800d451cd6020f49f0963b9832d15eea221eb50
1 /*
2 * linux/fs/affs/inode.c
3 *
4 * (c) 1996 Hans-Joachim Widmaier - Rewritten
5 *
6 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
7 *
8 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
9 *
10 * (C) 1991 Linus Torvalds - minix filesystem
11 */
12
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/statfs.h>
16 #include <linux/parser.h>
17 #include <linux/magic.h>
18 #include "affs.h"
19
20 extern struct timezone sys_tz;
21
22 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
23 static int affs_remount (struct super_block *sb, int *flags, char *data);
24
25 static void
26 affs_put_super(struct super_block *sb)
27 {
28 struct affs_sb_info *sbi = AFFS_SB(sb);
29 pr_debug("AFFS: put_super()\n");
30
31 if (!(sb->s_flags & MS_RDONLY)) {
32 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1);
33 secs_to_datestamp(get_seconds(),
34 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
35 affs_fix_checksum(sb, sbi->s_root_bh);
36 mark_buffer_dirty(sbi->s_root_bh);
37 }
38
39 kfree(sbi->s_prefix);
40 affs_free_bitmap(sb);
41 affs_brelse(sbi->s_root_bh);
42 kfree(sbi);
43 sb->s_fs_info = NULL;
44 return;
45 }
46
47 static void
48 affs_write_super(struct super_block *sb)
49 {
50 int clean = 2;
51 struct affs_sb_info *sbi = AFFS_SB(sb);
52
53 if (!(sb->s_flags & MS_RDONLY)) {
54 // if (sbi->s_bitmap[i].bm_bh) {
55 // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
56 // clean = 0;
57 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(clean);
58 secs_to_datestamp(get_seconds(),
59 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
60 affs_fix_checksum(sb, sbi->s_root_bh);
61 mark_buffer_dirty(sbi->s_root_bh);
62 sb->s_dirt = !clean; /* redo until bitmap synced */
63 } else
64 sb->s_dirt = 0;
65
66 pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean);
67 }
68
69 static struct kmem_cache * affs_inode_cachep;
70
71 static struct inode *affs_alloc_inode(struct super_block *sb)
72 {
73 struct affs_inode_info *ei;
74 ei = (struct affs_inode_info *)kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
75 if (!ei)
76 return NULL;
77 ei->vfs_inode.i_version = 1;
78 return &ei->vfs_inode;
79 }
80
81 static void affs_destroy_inode(struct inode *inode)
82 {
83 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
84 }
85
86 static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
87 {
88 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
89
90 init_MUTEX(&ei->i_link_lock);
91 init_MUTEX(&ei->i_ext_lock);
92 inode_init_once(&ei->vfs_inode);
93 }
94
95 static int init_inodecache(void)
96 {
97 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
98 sizeof(struct affs_inode_info),
99 0, (SLAB_RECLAIM_ACCOUNT|
100 SLAB_MEM_SPREAD),
101 init_once, NULL);
102 if (affs_inode_cachep == NULL)
103 return -ENOMEM;
104 return 0;
105 }
106
107 static void destroy_inodecache(void)
108 {
109 kmem_cache_destroy(affs_inode_cachep);
110 }
111
112 static const struct super_operations affs_sops = {
113 .alloc_inode = affs_alloc_inode,
114 .destroy_inode = affs_destroy_inode,
115 .read_inode = affs_read_inode,
116 .write_inode = affs_write_inode,
117 .put_inode = affs_put_inode,
118 .drop_inode = affs_drop_inode,
119 .delete_inode = affs_delete_inode,
120 .clear_inode = affs_clear_inode,
121 .put_super = affs_put_super,
122 .write_super = affs_write_super,
123 .statfs = affs_statfs,
124 .remount_fs = affs_remount,
125 };
126
127 enum {
128 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
129 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
130 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
131 };
132
133 static match_table_t tokens = {
134 {Opt_bs, "bs=%u"},
135 {Opt_mode, "mode=%o"},
136 {Opt_mufs, "mufs"},
137 {Opt_prefix, "prefix=%s"},
138 {Opt_protect, "protect"},
139 {Opt_reserved, "reserved=%u"},
140 {Opt_root, "root=%u"},
141 {Opt_setgid, "setgid=%u"},
142 {Opt_setuid, "setuid=%u"},
143 {Opt_verbose, "verbose"},
144 {Opt_volume, "volume=%s"},
145 {Opt_ignore, "grpquota"},
146 {Opt_ignore, "noquota"},
147 {Opt_ignore, "quota"},
148 {Opt_ignore, "usrquota"},
149 {Opt_err, NULL},
150 };
151
152 static int
153 parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
154 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
155 {
156 char *p;
157 substring_t args[MAX_OPT_ARGS];
158
159 /* Fill in defaults */
160
161 *uid = current->uid;
162 *gid = current->gid;
163 *reserved = 2;
164 *root = -1;
165 *blocksize = -1;
166 volume[0] = ':';
167 volume[1] = 0;
168 *mount_opts = 0;
169 if (!options)
170 return 1;
171
172 while ((p = strsep(&options, ",")) != NULL) {
173 int token, n, option;
174 if (!*p)
175 continue;
176
177 token = match_token(p, tokens, args);
178 switch (token) {
179 case Opt_bs:
180 if (match_int(&args[0], &n))
181 return -EINVAL;
182 if (n != 512 && n != 1024 && n != 2048
183 && n != 4096) {
184 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
185 return 0;
186 }
187 *blocksize = n;
188 break;
189 case Opt_mode:
190 if (match_octal(&args[0], &option))
191 return 1;
192 *mode = option & 0777;
193 *mount_opts |= SF_SETMODE;
194 break;
195 case Opt_mufs:
196 *mount_opts |= SF_MUFS;
197 break;
198 case Opt_prefix:
199 /* Free any previous prefix */
200 kfree(*prefix);
201 *prefix = NULL;
202 *prefix = match_strdup(&args[0]);
203 if (!*prefix)
204 return 0;
205 *mount_opts |= SF_PREFIX;
206 break;
207 case Opt_protect:
208 *mount_opts |= SF_IMMUTABLE;
209 break;
210 case Opt_reserved:
211 if (match_int(&args[0], reserved))
212 return 1;
213 break;
214 case Opt_root:
215 if (match_int(&args[0], root))
216 return 1;
217 break;
218 case Opt_setgid:
219 if (match_int(&args[0], &option))
220 return 1;
221 *gid = option;
222 *mount_opts |= SF_SETGID;
223 break;
224 case Opt_setuid:
225 if (match_int(&args[0], &option))
226 return -EINVAL;
227 *uid = option;
228 *mount_opts |= SF_SETUID;
229 break;
230 case Opt_verbose:
231 *mount_opts |= SF_VERBOSE;
232 break;
233 case Opt_volume: {
234 char *vol = match_strdup(&args[0]);
235 strlcpy(volume, vol, 32);
236 kfree(vol);
237 break;
238 }
239 case Opt_ignore:
240 /* Silently ignore the quota options */
241 break;
242 default:
243 printk("AFFS: Unrecognized mount option \"%s\" "
244 "or missing value\n", p);
245 return 0;
246 }
247 }
248 return 1;
249 }
250
251 /* This function definitely needs to be split up. Some fine day I'll
252 * hopefully have the guts to do so. Until then: sorry for the mess.
253 */
254
255 static int affs_fill_super(struct super_block *sb, void *data, int silent)
256 {
257 struct affs_sb_info *sbi;
258 struct buffer_head *root_bh = NULL;
259 struct buffer_head *boot_bh;
260 struct inode *root_inode = NULL;
261 s32 root_block;
262 int size, blocksize;
263 u32 chksum;
264 int num_bm;
265 int i, j;
266 s32 key;
267 uid_t uid;
268 gid_t gid;
269 int reserved;
270 unsigned long mount_flags;
271 int tmp_flags; /* fix remount prototype... */
272 u8 sig[4];
273
274 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
275
276 sb->s_magic = AFFS_SUPER_MAGIC;
277 sb->s_op = &affs_sops;
278 sb->s_flags |= MS_NODIRATIME;
279
280 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
281 if (!sbi)
282 return -ENOMEM;
283 sb->s_fs_info = sbi;
284 init_MUTEX(&sbi->s_bmlock);
285
286 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
287 &blocksize,&sbi->s_prefix,
288 sbi->s_volume, &mount_flags)) {
289 printk(KERN_ERR "AFFS: Error parsing options\n");
290 return -EINVAL;
291 }
292 /* N.B. after this point s_prefix must be released */
293
294 sbi->s_flags = mount_flags;
295 sbi->s_mode = i;
296 sbi->s_uid = uid;
297 sbi->s_gid = gid;
298 sbi->s_reserved= reserved;
299
300 /* Get the size of the device in 512-byte blocks.
301 * If we later see that the partition uses bigger
302 * blocks, we will have to change it.
303 */
304
305 size = sb->s_bdev->bd_inode->i_size >> 9;
306 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
307
308 affs_set_blocksize(sb, PAGE_SIZE);
309 /* Try to find root block. Its location depends on the block size. */
310
311 i = 512;
312 j = 4096;
313 if (blocksize > 0) {
314 i = j = blocksize;
315 size = size / (blocksize / 512);
316 }
317 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
318 sbi->s_root_block = root_block;
319 if (root_block < 0)
320 sbi->s_root_block = (reserved + size - 1) / 2;
321 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
322 affs_set_blocksize(sb, blocksize);
323 sbi->s_partition_size = size;
324
325 /* The root block location that was calculated above is not
326 * correct if the partition size is an odd number of 512-
327 * byte blocks, which will be rounded down to a number of
328 * 1024-byte blocks, and if there were an even number of
329 * reserved blocks. Ideally, all partition checkers should
330 * report the real number of blocks of the real blocksize,
331 * but since this just cannot be done, we have to try to
332 * find the root block anyways. In the above case, it is one
333 * block behind the calculated one. So we check this one, too.
334 */
335 for (num_bm = 0; num_bm < 2; num_bm++) {
336 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
337 "size=%d, reserved=%d\n",
338 sb->s_id,
339 sbi->s_root_block + num_bm,
340 blocksize, size, reserved);
341 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
342 if (!root_bh)
343 continue;
344 if (!affs_checksum_block(sb, root_bh) &&
345 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
346 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
347 sbi->s_hashsize = blocksize / 4 - 56;
348 sbi->s_root_block += num_bm;
349 key = 1;
350 goto got_root;
351 }
352 affs_brelse(root_bh);
353 root_bh = NULL;
354 }
355 }
356 if (!silent)
357 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
358 sb->s_id);
359 goto out_error;
360
361 /* N.B. after this point bh must be released */
362 got_root:
363 root_block = sbi->s_root_block;
364
365 /* Find out which kind of FS we have */
366 boot_bh = sb_bread(sb, 0);
367 if (!boot_bh) {
368 printk(KERN_ERR "AFFS: Cannot read boot block\n");
369 goto out_error;
370 }
371 memcpy(sig, boot_bh->b_data, 4);
372 brelse(boot_bh);
373 chksum = be32_to_cpu(*(__be32 *)sig);
374
375 /* Dircache filesystems are compatible with non-dircache ones
376 * when reading. As long as they aren't supported, writing is
377 * not recommended.
378 */
379 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
380 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
381 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
382 sb->s_id);
383 sb->s_flags |= MS_RDONLY;
384 }
385 switch (chksum) {
386 case MUFS_FS:
387 case MUFS_INTLFFS:
388 case MUFS_DCFFS:
389 sbi->s_flags |= SF_MUFS;
390 /* fall thru */
391 case FS_INTLFFS:
392 case FS_DCFFS:
393 sbi->s_flags |= SF_INTL;
394 break;
395 case MUFS_FFS:
396 sbi->s_flags |= SF_MUFS;
397 break;
398 case FS_FFS:
399 break;
400 case MUFS_OFS:
401 sbi->s_flags |= SF_MUFS;
402 /* fall thru */
403 case FS_OFS:
404 sbi->s_flags |= SF_OFS;
405 sb->s_flags |= MS_NOEXEC;
406 break;
407 case MUFS_DCOFS:
408 case MUFS_INTLOFS:
409 sbi->s_flags |= SF_MUFS;
410 case FS_DCOFS:
411 case FS_INTLOFS:
412 sbi->s_flags |= SF_INTL | SF_OFS;
413 sb->s_flags |= MS_NOEXEC;
414 break;
415 default:
416 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
417 sb->s_id, chksum);
418 goto out_error;
419 }
420
421 if (mount_flags & SF_VERBOSE) {
422 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
423 printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
424 len > 31 ? 31 : len,
425 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
426 sig, sig[3] + '0', blocksize);
427 }
428
429 sb->s_flags |= MS_NODEV | MS_NOSUID;
430
431 sbi->s_data_blksize = sb->s_blocksize;
432 if (sbi->s_flags & SF_OFS)
433 sbi->s_data_blksize -= 24;
434
435 /* Keep super block in cache */
436 sbi->s_root_bh = root_bh;
437 /* N.B. after this point s_root_bh must be released */
438
439 tmp_flags = sb->s_flags;
440 if (affs_init_bitmap(sb, &tmp_flags))
441 goto out_error;
442 sb->s_flags = tmp_flags;
443
444 /* set up enough so that it can read an inode */
445
446 root_inode = iget(sb, root_block);
447 sb->s_root = d_alloc_root(root_inode);
448 if (!sb->s_root) {
449 printk(KERN_ERR "AFFS: Get root inode failed\n");
450 goto out_error;
451 }
452 sb->s_root->d_op = &affs_dentry_operations;
453
454 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
455 return 0;
456
457 /*
458 * Begin the cascaded cleanup ...
459 */
460 out_error:
461 if (root_inode)
462 iput(root_inode);
463 kfree(sbi->s_bitmap);
464 affs_brelse(root_bh);
465 kfree(sbi->s_prefix);
466 kfree(sbi);
467 sb->s_fs_info = NULL;
468 return -EINVAL;
469 }
470
471 static int
472 affs_remount(struct super_block *sb, int *flags, char *data)
473 {
474 struct affs_sb_info *sbi = AFFS_SB(sb);
475 int blocksize;
476 uid_t uid;
477 gid_t gid;
478 int mode;
479 int reserved;
480 int root_block;
481 unsigned long mount_flags;
482 int res = 0;
483
484 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
485
486 *flags |= MS_NODIRATIME;
487
488 if (!parse_options(data,&uid,&gid,&mode,&reserved,&root_block,
489 &blocksize,&sbi->s_prefix,sbi->s_volume,&mount_flags))
490 return -EINVAL;
491 sbi->s_flags = mount_flags;
492 sbi->s_mode = mode;
493 sbi->s_uid = uid;
494 sbi->s_gid = gid;
495
496 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
497 return 0;
498 if (*flags & MS_RDONLY) {
499 sb->s_dirt = 1;
500 while (sb->s_dirt)
501 affs_write_super(sb);
502 affs_free_bitmap(sb);
503 } else
504 res = affs_init_bitmap(sb, flags);
505
506 return res;
507 }
508
509 static int
510 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
511 {
512 struct super_block *sb = dentry->d_sb;
513 int free;
514
515 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
516 AFFS_SB(sb)->s_reserved);
517
518 free = affs_count_free_blocks(sb);
519 buf->f_type = AFFS_SUPER_MAGIC;
520 buf->f_bsize = sb->s_blocksize;
521 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
522 buf->f_bfree = free;
523 buf->f_bavail = free;
524 return 0;
525 }
526
527 static int affs_get_sb(struct file_system_type *fs_type,
528 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
529 {
530 return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super,
531 mnt);
532 }
533
534 static struct file_system_type affs_fs_type = {
535 .owner = THIS_MODULE,
536 .name = "affs",
537 .get_sb = affs_get_sb,
538 .kill_sb = kill_block_super,
539 .fs_flags = FS_REQUIRES_DEV,
540 };
541
542 static int __init init_affs_fs(void)
543 {
544 int err = init_inodecache();
545 if (err)
546 goto out1;
547 err = register_filesystem(&affs_fs_type);
548 if (err)
549 goto out;
550 return 0;
551 out:
552 destroy_inodecache();
553 out1:
554 return err;
555 }
556
557 static void __exit exit_affs_fs(void)
558 {
559 unregister_filesystem(&affs_fs_type);
560 destroy_inodecache();
561 }
562
563 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
564 MODULE_LICENSE("GPL");
565
566 module_init(init_affs_fs)
567 module_exit(exit_affs_fs)
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