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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 <linux/sched.h>
19#include <linux/slab.h>
20#include "affs.h"
21
22extern struct timezone sys_tz;
23
24static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
25static int affs_remount (struct super_block *sb, int *flags, char *data);
26
27static void
28affs_commit_super(struct super_block *sb, int wait, int clean)
29{
30 struct affs_sb_info *sbi = AFFS_SB(sb);
31 struct buffer_head *bh = sbi->s_root_bh;
32 struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
33
34 tail->bm_flag = cpu_to_be32(clean);
35 secs_to_datestamp(get_seconds(), &tail->disk_change);
36 affs_fix_checksum(sb, bh);
37 mark_buffer_dirty(bh);
38 if (wait)
39 sync_dirty_buffer(bh);
40}
41
42static void
43affs_put_super(struct super_block *sb)
44{
45 struct affs_sb_info *sbi = AFFS_SB(sb);
46 pr_debug("AFFS: put_super()\n");
47
48 if (!(sb->s_flags & MS_RDONLY) && sb->s_dirt)
49 affs_commit_super(sb, 1, 1);
50
51 kfree(sbi->s_prefix);
52 affs_free_bitmap(sb);
53 affs_brelse(sbi->s_root_bh);
54 kfree(sbi);
55 sb->s_fs_info = NULL;
56}
57
58static void
59affs_write_super(struct super_block *sb)
60{
61 lock_super(sb);
62 if (!(sb->s_flags & MS_RDONLY))
63 affs_commit_super(sb, 1, 2);
64 sb->s_dirt = 0;
65 unlock_super(sb);
66
67 pr_debug("AFFS: write_super() at %lu, clean=2\n", get_seconds());
68}
69
70static int
71affs_sync_fs(struct super_block *sb, int wait)
72{
73 lock_super(sb);
74 affs_commit_super(sb, wait, 2);
75 sb->s_dirt = 0;
76 unlock_super(sb);
77 return 0;
78}
79
80static struct kmem_cache * affs_inode_cachep;
81
82static struct inode *affs_alloc_inode(struct super_block *sb)
83{
84 struct affs_inode_info *i;
85
86 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
87 if (!i)
88 return NULL;
89
90 i->vfs_inode.i_version = 1;
91 i->i_lc = NULL;
92 i->i_ext_bh = NULL;
93 i->i_pa_cnt = 0;
94
95 return &i->vfs_inode;
96}
97
98static void affs_i_callback(struct rcu_head *head)
99{
100 struct inode *inode = container_of(head, struct inode, i_rcu);
101 INIT_LIST_HEAD(&inode->i_dentry);
102 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
103}
104
105static void affs_destroy_inode(struct inode *inode)
106{
107 call_rcu(&inode->i_rcu, affs_i_callback);
108}
109
110static void init_once(void *foo)
111{
112 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
113
114 sema_init(&ei->i_link_lock, 1);
115 sema_init(&ei->i_ext_lock, 1);
116 inode_init_once(&ei->vfs_inode);
117}
118
119static int init_inodecache(void)
120{
121 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
122 sizeof(struct affs_inode_info),
123 0, (SLAB_RECLAIM_ACCOUNT|
124 SLAB_MEM_SPREAD),
125 init_once);
126 if (affs_inode_cachep == NULL)
127 return -ENOMEM;
128 return 0;
129}
130
131static void destroy_inodecache(void)
132{
133 kmem_cache_destroy(affs_inode_cachep);
134}
135
136static const struct super_operations affs_sops = {
137 .alloc_inode = affs_alloc_inode,
138 .destroy_inode = affs_destroy_inode,
139 .write_inode = affs_write_inode,
140 .evict_inode = affs_evict_inode,
141 .put_super = affs_put_super,
142 .write_super = affs_write_super,
143 .sync_fs = affs_sync_fs,
144 .statfs = affs_statfs,
145 .remount_fs = affs_remount,
146 .show_options = generic_show_options,
147};
148
149enum {
150 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
151 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
152 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
153};
154
155static const match_table_t tokens = {
156 {Opt_bs, "bs=%u"},
157 {Opt_mode, "mode=%o"},
158 {Opt_mufs, "mufs"},
159 {Opt_prefix, "prefix=%s"},
160 {Opt_protect, "protect"},
161 {Opt_reserved, "reserved=%u"},
162 {Opt_root, "root=%u"},
163 {Opt_setgid, "setgid=%u"},
164 {Opt_setuid, "setuid=%u"},
165 {Opt_verbose, "verbose"},
166 {Opt_volume, "volume=%s"},
167 {Opt_ignore, "grpquota"},
168 {Opt_ignore, "noquota"},
169 {Opt_ignore, "quota"},
170 {Opt_ignore, "usrquota"},
171 {Opt_err, NULL},
172};
173
174static int
175parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
176 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
177{
178 char *p;
179 substring_t args[MAX_OPT_ARGS];
180
181 /* Fill in defaults */
182
183 *uid = current_uid();
184 *gid = current_gid();
185 *reserved = 2;
186 *root = -1;
187 *blocksize = -1;
188 volume[0] = ':';
189 volume[1] = 0;
190 *mount_opts = 0;
191 if (!options)
192 return 1;
193
194 while ((p = strsep(&options, ",")) != NULL) {
195 int token, n, option;
196 if (!*p)
197 continue;
198
199 token = match_token(p, tokens, args);
200 switch (token) {
201 case Opt_bs:
202 if (match_int(&args[0], &n))
203 return 0;
204 if (n != 512 && n != 1024 && n != 2048
205 && n != 4096) {
206 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
207 return 0;
208 }
209 *blocksize = n;
210 break;
211 case Opt_mode:
212 if (match_octal(&args[0], &option))
213 return 0;
214 *mode = option & 0777;
215 *mount_opts |= SF_SETMODE;
216 break;
217 case Opt_mufs:
218 *mount_opts |= SF_MUFS;
219 break;
220 case Opt_prefix:
221 *prefix = match_strdup(&args[0]);
222 if (!*prefix)
223 return 0;
224 *mount_opts |= SF_PREFIX;
225 break;
226 case Opt_protect:
227 *mount_opts |= SF_IMMUTABLE;
228 break;
229 case Opt_reserved:
230 if (match_int(&args[0], reserved))
231 return 0;
232 break;
233 case Opt_root:
234 if (match_int(&args[0], root))
235 return 0;
236 break;
237 case Opt_setgid:
238 if (match_int(&args[0], &option))
239 return 0;
240 *gid = option;
241 *mount_opts |= SF_SETGID;
242 break;
243 case Opt_setuid:
244 if (match_int(&args[0], &option))
245 return 0;
246 *uid = option;
247 *mount_opts |= SF_SETUID;
248 break;
249 case Opt_verbose:
250 *mount_opts |= SF_VERBOSE;
251 break;
252 case Opt_volume: {
253 char *vol = match_strdup(&args[0]);
254 if (!vol)
255 return 0;
256 strlcpy(volume, vol, 32);
257 kfree(vol);
258 break;
259 }
260 case Opt_ignore:
261 /* Silently ignore the quota options */
262 break;
263 default:
264 printk("AFFS: Unrecognized mount option \"%s\" "
265 "or missing value\n", p);
266 return 0;
267 }
268 }
269 return 1;
270}
271
272/* This function definitely needs to be split up. Some fine day I'll
273 * hopefully have the guts to do so. Until then: sorry for the mess.
274 */
275
276static int affs_fill_super(struct super_block *sb, void *data, int silent)
277{
278 struct affs_sb_info *sbi;
279 struct buffer_head *root_bh = NULL;
280 struct buffer_head *boot_bh;
281 struct inode *root_inode = NULL;
282 s32 root_block;
283 int size, blocksize;
284 u32 chksum;
285 int num_bm;
286 int i, j;
287 s32 key;
288 uid_t uid;
289 gid_t gid;
290 int reserved;
291 unsigned long mount_flags;
292 int tmp_flags; /* fix remount prototype... */
293 u8 sig[4];
294 int ret = -EINVAL;
295
296 save_mount_options(sb, data);
297
298 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
299
300 sb->s_magic = AFFS_SUPER_MAGIC;
301 sb->s_op = &affs_sops;
302 sb->s_flags |= MS_NODIRATIME;
303
304 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
305 if (!sbi)
306 return -ENOMEM;
307
308 sb->s_fs_info = sbi;
309 mutex_init(&sbi->s_bmlock);
310 spin_lock_init(&sbi->symlink_lock);
311
312 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
313 &blocksize,&sbi->s_prefix,
314 sbi->s_volume, &mount_flags)) {
315 printk(KERN_ERR "AFFS: Error parsing options\n");
316 kfree(sbi->s_prefix);
317 kfree(sbi);
318 return -EINVAL;
319 }
320 /* N.B. after this point s_prefix must be released */
321
322 sbi->s_flags = mount_flags;
323 sbi->s_mode = i;
324 sbi->s_uid = uid;
325 sbi->s_gid = gid;
326 sbi->s_reserved= reserved;
327
328 /* Get the size of the device in 512-byte blocks.
329 * If we later see that the partition uses bigger
330 * blocks, we will have to change it.
331 */
332
333 size = sb->s_bdev->bd_inode->i_size >> 9;
334 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
335
336 affs_set_blocksize(sb, PAGE_SIZE);
337 /* Try to find root block. Its location depends on the block size. */
338
339 i = 512;
340 j = 4096;
341 if (blocksize > 0) {
342 i = j = blocksize;
343 size = size / (blocksize / 512);
344 }
345 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
346 sbi->s_root_block = root_block;
347 if (root_block < 0)
348 sbi->s_root_block = (reserved + size - 1) / 2;
349 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
350 affs_set_blocksize(sb, blocksize);
351 sbi->s_partition_size = size;
352
353 /* The root block location that was calculated above is not
354 * correct if the partition size is an odd number of 512-
355 * byte blocks, which will be rounded down to a number of
356 * 1024-byte blocks, and if there were an even number of
357 * reserved blocks. Ideally, all partition checkers should
358 * report the real number of blocks of the real blocksize,
359 * but since this just cannot be done, we have to try to
360 * find the root block anyways. In the above case, it is one
361 * block behind the calculated one. So we check this one, too.
362 */
363 for (num_bm = 0; num_bm < 2; num_bm++) {
364 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
365 "size=%d, reserved=%d\n",
366 sb->s_id,
367 sbi->s_root_block + num_bm,
368 blocksize, size, reserved);
369 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
370 if (!root_bh)
371 continue;
372 if (!affs_checksum_block(sb, root_bh) &&
373 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
374 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
375 sbi->s_hashsize = blocksize / 4 - 56;
376 sbi->s_root_block += num_bm;
377 key = 1;
378 goto got_root;
379 }
380 affs_brelse(root_bh);
381 root_bh = NULL;
382 }
383 }
384 if (!silent)
385 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
386 sb->s_id);
387 goto out_error;
388
389 /* N.B. after this point bh must be released */
390got_root:
391 root_block = sbi->s_root_block;
392
393 /* Find out which kind of FS we have */
394 boot_bh = sb_bread(sb, 0);
395 if (!boot_bh) {
396 printk(KERN_ERR "AFFS: Cannot read boot block\n");
397 goto out_error;
398 }
399 memcpy(sig, boot_bh->b_data, 4);
400 brelse(boot_bh);
401 chksum = be32_to_cpu(*(__be32 *)sig);
402
403 /* Dircache filesystems are compatible with non-dircache ones
404 * when reading. As long as they aren't supported, writing is
405 * not recommended.
406 */
407 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
408 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
409 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
410 sb->s_id);
411 sb->s_flags |= MS_RDONLY;
412 }
413 switch (chksum) {
414 case MUFS_FS:
415 case MUFS_INTLFFS:
416 case MUFS_DCFFS:
417 sbi->s_flags |= SF_MUFS;
418 /* fall thru */
419 case FS_INTLFFS:
420 case FS_DCFFS:
421 sbi->s_flags |= SF_INTL;
422 break;
423 case MUFS_FFS:
424 sbi->s_flags |= SF_MUFS;
425 break;
426 case FS_FFS:
427 break;
428 case MUFS_OFS:
429 sbi->s_flags |= SF_MUFS;
430 /* fall thru */
431 case FS_OFS:
432 sbi->s_flags |= SF_OFS;
433 sb->s_flags |= MS_NOEXEC;
434 break;
435 case MUFS_DCOFS:
436 case MUFS_INTLOFS:
437 sbi->s_flags |= SF_MUFS;
438 case FS_DCOFS:
439 case FS_INTLOFS:
440 sbi->s_flags |= SF_INTL | SF_OFS;
441 sb->s_flags |= MS_NOEXEC;
442 break;
443 default:
444 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
445 sb->s_id, chksum);
446 goto out_error;
447 }
448
449 if (mount_flags & SF_VERBOSE) {
450 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
451 printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
452 len > 31 ? 31 : len,
453 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
454 sig, sig[3] + '0', blocksize);
455 }
456
457 sb->s_flags |= MS_NODEV | MS_NOSUID;
458
459 sbi->s_data_blksize = sb->s_blocksize;
460 if (sbi->s_flags & SF_OFS)
461 sbi->s_data_blksize -= 24;
462
463 /* Keep super block in cache */
464 sbi->s_root_bh = root_bh;
465 /* N.B. after this point s_root_bh must be released */
466
467 tmp_flags = sb->s_flags;
468 if (affs_init_bitmap(sb, &tmp_flags))
469 goto out_error;
470 sb->s_flags = tmp_flags;
471
472 /* set up enough so that it can read an inode */
473
474 root_inode = affs_iget(sb, root_block);
475 if (IS_ERR(root_inode)) {
476 ret = PTR_ERR(root_inode);
477 goto out_error_noinode;
478 }
479
480 if (AFFS_SB(sb)->s_flags & SF_INTL)
481 sb->s_d_op = &affs_intl_dentry_operations;
482 else
483 sb->s_d_op = &affs_dentry_operations;
484
485 sb->s_root = d_alloc_root(root_inode);
486 if (!sb->s_root) {
487 printk(KERN_ERR "AFFS: Get root inode failed\n");
488 goto out_error;
489 }
490
491 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
492 return 0;
493
494 /*
495 * Begin the cascaded cleanup ...
496 */
497out_error:
498 if (root_inode)
499 iput(root_inode);
500out_error_noinode:
501 kfree(sbi->s_bitmap);
502 affs_brelse(root_bh);
503 kfree(sbi->s_prefix);
504 kfree(sbi);
505 sb->s_fs_info = NULL;
506 return ret;
507}
508
509static int
510affs_remount(struct super_block *sb, int *flags, char *data)
511{
512 struct affs_sb_info *sbi = AFFS_SB(sb);
513 int blocksize;
514 uid_t uid;
515 gid_t gid;
516 int mode;
517 int reserved;
518 int root_block;
519 unsigned long mount_flags;
520 int res = 0;
521 char *new_opts = kstrdup(data, GFP_KERNEL);
522 char volume[32];
523 char *prefix = NULL;
524
525 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
526
527 *flags |= MS_NODIRATIME;
528
529 memcpy(volume, sbi->s_volume, 32);
530 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
531 &blocksize, &prefix, volume,
532 &mount_flags)) {
533 kfree(prefix);
534 kfree(new_opts);
535 return -EINVAL;
536 }
537
538 replace_mount_options(sb, new_opts);
539
540 sbi->s_flags = mount_flags;
541 sbi->s_mode = mode;
542 sbi->s_uid = uid;
543 sbi->s_gid = gid;
544 /* protect against readers */
545 spin_lock(&sbi->symlink_lock);
546 if (prefix) {
547 kfree(sbi->s_prefix);
548 sbi->s_prefix = prefix;
549 }
550 memcpy(sbi->s_volume, volume, 32);
551 spin_unlock(&sbi->symlink_lock);
552
553 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
554 return 0;
555
556 if (*flags & MS_RDONLY) {
557 affs_write_super(sb);
558 affs_free_bitmap(sb);
559 } else
560 res = affs_init_bitmap(sb, flags);
561
562 return res;
563}
564
565static int
566affs_statfs(struct dentry *dentry, struct kstatfs *buf)
567{
568 struct super_block *sb = dentry->d_sb;
569 int free;
570 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
571
572 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
573 AFFS_SB(sb)->s_reserved);
574
575 free = affs_count_free_blocks(sb);
576 buf->f_type = AFFS_SUPER_MAGIC;
577 buf->f_bsize = sb->s_blocksize;
578 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
579 buf->f_bfree = free;
580 buf->f_bavail = free;
581 buf->f_fsid.val[0] = (u32)id;
582 buf->f_fsid.val[1] = (u32)(id >> 32);
583 buf->f_namelen = 30;
584 return 0;
585}
586
587static struct dentry *affs_mount(struct file_system_type *fs_type,
588 int flags, const char *dev_name, void *data)
589{
590 return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
591}
592
593static struct file_system_type affs_fs_type = {
594 .owner = THIS_MODULE,
595 .name = "affs",
596 .mount = affs_mount,
597 .kill_sb = kill_block_super,
598 .fs_flags = FS_REQUIRES_DEV,
599};
600
601static int __init init_affs_fs(void)
602{
603 int err = init_inodecache();
604 if (err)
605 goto out1;
606 err = register_filesystem(&affs_fs_type);
607 if (err)
608 goto out;
609 return 0;
610out:
611 destroy_inodecache();
612out1:
613 return err;
614}
615
616static void __exit exit_affs_fs(void)
617{
618 unregister_filesystem(&affs_fs_type);
619 destroy_inodecache();
620}
621
622MODULE_DESCRIPTION("Amiga filesystem support for Linux");
623MODULE_LICENSE("GPL");
624
625module_init(init_affs_fs)
626module_exit(exit_affs_fs)
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 <linux/sched.h>
19#include <linux/cred.h>
20#include <linux/slab.h>
21#include <linux/writeback.h>
22#include <linux/blkdev.h>
23#include <linux/seq_file.h>
24#include <linux/iversion.h>
25#include "affs.h"
26
27static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
28static int affs_show_options(struct seq_file *m, struct dentry *root);
29static int affs_remount (struct super_block *sb, int *flags, char *data);
30
31static void
32affs_commit_super(struct super_block *sb, int wait)
33{
34 struct affs_sb_info *sbi = AFFS_SB(sb);
35 struct buffer_head *bh = sbi->s_root_bh;
36 struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
37
38 lock_buffer(bh);
39 affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
40 affs_fix_checksum(sb, bh);
41 unlock_buffer(bh);
42
43 mark_buffer_dirty(bh);
44 if (wait)
45 sync_dirty_buffer(bh);
46}
47
48static void
49affs_put_super(struct super_block *sb)
50{
51 struct affs_sb_info *sbi = AFFS_SB(sb);
52 pr_debug("%s()\n", __func__);
53
54 cancel_delayed_work_sync(&sbi->sb_work);
55}
56
57static int
58affs_sync_fs(struct super_block *sb, int wait)
59{
60 affs_commit_super(sb, wait);
61 return 0;
62}
63
64static void flush_superblock(struct work_struct *work)
65{
66 struct affs_sb_info *sbi;
67 struct super_block *sb;
68
69 sbi = container_of(work, struct affs_sb_info, sb_work.work);
70 sb = sbi->sb;
71
72 spin_lock(&sbi->work_lock);
73 sbi->work_queued = 0;
74 spin_unlock(&sbi->work_lock);
75
76 affs_commit_super(sb, 1);
77}
78
79void affs_mark_sb_dirty(struct super_block *sb)
80{
81 struct affs_sb_info *sbi = AFFS_SB(sb);
82 unsigned long delay;
83
84 if (sb_rdonly(sb))
85 return;
86
87 spin_lock(&sbi->work_lock);
88 if (!sbi->work_queued) {
89 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
90 queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
91 sbi->work_queued = 1;
92 }
93 spin_unlock(&sbi->work_lock);
94}
95
96static struct kmem_cache * affs_inode_cachep;
97
98static struct inode *affs_alloc_inode(struct super_block *sb)
99{
100 struct affs_inode_info *i;
101
102 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
103 if (!i)
104 return NULL;
105
106 inode_set_iversion(&i->vfs_inode, 1);
107 i->i_lc = NULL;
108 i->i_ext_bh = NULL;
109 i->i_pa_cnt = 0;
110
111 return &i->vfs_inode;
112}
113
114static void affs_i_callback(struct rcu_head *head)
115{
116 struct inode *inode = container_of(head, struct inode, i_rcu);
117 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
118}
119
120static void affs_destroy_inode(struct inode *inode)
121{
122 call_rcu(&inode->i_rcu, affs_i_callback);
123}
124
125static void init_once(void *foo)
126{
127 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
128
129 sema_init(&ei->i_link_lock, 1);
130 sema_init(&ei->i_ext_lock, 1);
131 inode_init_once(&ei->vfs_inode);
132}
133
134static int __init init_inodecache(void)
135{
136 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
137 sizeof(struct affs_inode_info),
138 0, (SLAB_RECLAIM_ACCOUNT|
139 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
140 init_once);
141 if (affs_inode_cachep == NULL)
142 return -ENOMEM;
143 return 0;
144}
145
146static void destroy_inodecache(void)
147{
148 /*
149 * Make sure all delayed rcu free inodes are flushed before we
150 * destroy cache.
151 */
152 rcu_barrier();
153 kmem_cache_destroy(affs_inode_cachep);
154}
155
156static const struct super_operations affs_sops = {
157 .alloc_inode = affs_alloc_inode,
158 .destroy_inode = affs_destroy_inode,
159 .write_inode = affs_write_inode,
160 .evict_inode = affs_evict_inode,
161 .put_super = affs_put_super,
162 .sync_fs = affs_sync_fs,
163 .statfs = affs_statfs,
164 .remount_fs = affs_remount,
165 .show_options = affs_show_options,
166};
167
168enum {
169 Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
170 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
171 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
172};
173
174static const match_table_t tokens = {
175 {Opt_bs, "bs=%u"},
176 {Opt_mode, "mode=%o"},
177 {Opt_mufs, "mufs"},
178 {Opt_notruncate, "nofilenametruncate"},
179 {Opt_prefix, "prefix=%s"},
180 {Opt_protect, "protect"},
181 {Opt_reserved, "reserved=%u"},
182 {Opt_root, "root=%u"},
183 {Opt_setgid, "setgid=%u"},
184 {Opt_setuid, "setuid=%u"},
185 {Opt_verbose, "verbose"},
186 {Opt_volume, "volume=%s"},
187 {Opt_ignore, "grpquota"},
188 {Opt_ignore, "noquota"},
189 {Opt_ignore, "quota"},
190 {Opt_ignore, "usrquota"},
191 {Opt_err, NULL},
192};
193
194static int
195parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root,
196 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
197{
198 char *p;
199 substring_t args[MAX_OPT_ARGS];
200
201 /* Fill in defaults */
202
203 *uid = current_uid();
204 *gid = current_gid();
205 *reserved = 2;
206 *root = -1;
207 *blocksize = -1;
208 volume[0] = ':';
209 volume[1] = 0;
210 *mount_opts = 0;
211 if (!options)
212 return 1;
213
214 while ((p = strsep(&options, ",")) != NULL) {
215 int token, n, option;
216 if (!*p)
217 continue;
218
219 token = match_token(p, tokens, args);
220 switch (token) {
221 case Opt_bs:
222 if (match_int(&args[0], &n))
223 return 0;
224 if (n != 512 && n != 1024 && n != 2048
225 && n != 4096) {
226 pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
227 return 0;
228 }
229 *blocksize = n;
230 break;
231 case Opt_mode:
232 if (match_octal(&args[0], &option))
233 return 0;
234 *mode = option & 0777;
235 affs_set_opt(*mount_opts, SF_SETMODE);
236 break;
237 case Opt_mufs:
238 affs_set_opt(*mount_opts, SF_MUFS);
239 break;
240 case Opt_notruncate:
241 affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
242 break;
243 case Opt_prefix:
244 *prefix = match_strdup(&args[0]);
245 if (!*prefix)
246 return 0;
247 affs_set_opt(*mount_opts, SF_PREFIX);
248 break;
249 case Opt_protect:
250 affs_set_opt(*mount_opts, SF_IMMUTABLE);
251 break;
252 case Opt_reserved:
253 if (match_int(&args[0], reserved))
254 return 0;
255 break;
256 case Opt_root:
257 if (match_int(&args[0], root))
258 return 0;
259 break;
260 case Opt_setgid:
261 if (match_int(&args[0], &option))
262 return 0;
263 *gid = make_kgid(current_user_ns(), option);
264 if (!gid_valid(*gid))
265 return 0;
266 affs_set_opt(*mount_opts, SF_SETGID);
267 break;
268 case Opt_setuid:
269 if (match_int(&args[0], &option))
270 return 0;
271 *uid = make_kuid(current_user_ns(), option);
272 if (!uid_valid(*uid))
273 return 0;
274 affs_set_opt(*mount_opts, SF_SETUID);
275 break;
276 case Opt_verbose:
277 affs_set_opt(*mount_opts, SF_VERBOSE);
278 break;
279 case Opt_volume: {
280 char *vol = match_strdup(&args[0]);
281 if (!vol)
282 return 0;
283 strlcpy(volume, vol, 32);
284 kfree(vol);
285 break;
286 }
287 case Opt_ignore:
288 /* Silently ignore the quota options */
289 break;
290 default:
291 pr_warn("Unrecognized mount option \"%s\" or missing value\n",
292 p);
293 return 0;
294 }
295 }
296 return 1;
297}
298
299static int affs_show_options(struct seq_file *m, struct dentry *root)
300{
301 struct super_block *sb = root->d_sb;
302 struct affs_sb_info *sbi = AFFS_SB(sb);
303
304 if (sb->s_blocksize)
305 seq_printf(m, ",bs=%lu", sb->s_blocksize);
306 if (affs_test_opt(sbi->s_flags, SF_SETMODE))
307 seq_printf(m, ",mode=%o", sbi->s_mode);
308 if (affs_test_opt(sbi->s_flags, SF_MUFS))
309 seq_puts(m, ",mufs");
310 if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE))
311 seq_puts(m, ",nofilenametruncate");
312 if (affs_test_opt(sbi->s_flags, SF_PREFIX))
313 seq_printf(m, ",prefix=%s", sbi->s_prefix);
314 if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE))
315 seq_puts(m, ",protect");
316 if (sbi->s_reserved != 2)
317 seq_printf(m, ",reserved=%u", sbi->s_reserved);
318 if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2)
319 seq_printf(m, ",root=%u", sbi->s_root_block);
320 if (affs_test_opt(sbi->s_flags, SF_SETGID))
321 seq_printf(m, ",setgid=%u",
322 from_kgid_munged(&init_user_ns, sbi->s_gid));
323 if (affs_test_opt(sbi->s_flags, SF_SETUID))
324 seq_printf(m, ",setuid=%u",
325 from_kuid_munged(&init_user_ns, sbi->s_uid));
326 if (affs_test_opt(sbi->s_flags, SF_VERBOSE))
327 seq_puts(m, ",verbose");
328 if (sbi->s_volume[0])
329 seq_printf(m, ",volume=%s", sbi->s_volume);
330 return 0;
331}
332
333/* This function definitely needs to be split up. Some fine day I'll
334 * hopefully have the guts to do so. Until then: sorry for the mess.
335 */
336
337static int affs_fill_super(struct super_block *sb, void *data, int silent)
338{
339 struct affs_sb_info *sbi;
340 struct buffer_head *root_bh = NULL;
341 struct buffer_head *boot_bh;
342 struct inode *root_inode = NULL;
343 s32 root_block;
344 int size, blocksize;
345 u32 chksum;
346 int num_bm;
347 int i, j;
348 kuid_t uid;
349 kgid_t gid;
350 int reserved;
351 unsigned long mount_flags;
352 int tmp_flags; /* fix remount prototype... */
353 u8 sig[4];
354 int ret;
355
356 pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
357
358 sb->s_magic = AFFS_SUPER_MAGIC;
359 sb->s_op = &affs_sops;
360 sb->s_flags |= SB_NODIRATIME;
361
362 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
363 if (!sbi)
364 return -ENOMEM;
365
366 sb->s_fs_info = sbi;
367 sbi->sb = sb;
368 mutex_init(&sbi->s_bmlock);
369 spin_lock_init(&sbi->symlink_lock);
370 spin_lock_init(&sbi->work_lock);
371 INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
372
373 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
374 &blocksize,&sbi->s_prefix,
375 sbi->s_volume, &mount_flags)) {
376 pr_err("Error parsing options\n");
377 return -EINVAL;
378 }
379 /* N.B. after this point s_prefix must be released */
380
381 sbi->s_flags = mount_flags;
382 sbi->s_mode = i;
383 sbi->s_uid = uid;
384 sbi->s_gid = gid;
385 sbi->s_reserved= reserved;
386
387 /* Get the size of the device in 512-byte blocks.
388 * If we later see that the partition uses bigger
389 * blocks, we will have to change it.
390 */
391
392 size = i_size_read(sb->s_bdev->bd_inode) >> 9;
393 pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
394
395 affs_set_blocksize(sb, PAGE_SIZE);
396 /* Try to find root block. Its location depends on the block size. */
397
398 i = bdev_logical_block_size(sb->s_bdev);
399 j = PAGE_SIZE;
400 if (blocksize > 0) {
401 i = j = blocksize;
402 size = size / (blocksize / 512);
403 }
404
405 for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
406 sbi->s_root_block = root_block;
407 if (root_block < 0)
408 sbi->s_root_block = (reserved + size - 1) / 2;
409 pr_debug("setting blocksize to %d\n", blocksize);
410 affs_set_blocksize(sb, blocksize);
411 sbi->s_partition_size = size;
412
413 /* The root block location that was calculated above is not
414 * correct if the partition size is an odd number of 512-
415 * byte blocks, which will be rounded down to a number of
416 * 1024-byte blocks, and if there were an even number of
417 * reserved blocks. Ideally, all partition checkers should
418 * report the real number of blocks of the real blocksize,
419 * but since this just cannot be done, we have to try to
420 * find the root block anyways. In the above case, it is one
421 * block behind the calculated one. So we check this one, too.
422 */
423 for (num_bm = 0; num_bm < 2; num_bm++) {
424 pr_debug("Dev %s, trying root=%u, bs=%d, "
425 "size=%d, reserved=%d\n",
426 sb->s_id,
427 sbi->s_root_block + num_bm,
428 blocksize, size, reserved);
429 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
430 if (!root_bh)
431 continue;
432 if (!affs_checksum_block(sb, root_bh) &&
433 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
434 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
435 sbi->s_hashsize = blocksize / 4 - 56;
436 sbi->s_root_block += num_bm;
437 goto got_root;
438 }
439 affs_brelse(root_bh);
440 root_bh = NULL;
441 }
442 }
443 if (!silent)
444 pr_err("No valid root block on device %s\n", sb->s_id);
445 return -EINVAL;
446
447 /* N.B. after this point bh must be released */
448got_root:
449 /* Keep super block in cache */
450 sbi->s_root_bh = root_bh;
451 root_block = sbi->s_root_block;
452
453 /* Find out which kind of FS we have */
454 boot_bh = sb_bread(sb, 0);
455 if (!boot_bh) {
456 pr_err("Cannot read boot block\n");
457 return -EINVAL;
458 }
459 memcpy(sig, boot_bh->b_data, 4);
460 brelse(boot_bh);
461 chksum = be32_to_cpu(*(__be32 *)sig);
462
463 /* Dircache filesystems are compatible with non-dircache ones
464 * when reading. As long as they aren't supported, writing is
465 * not recommended.
466 */
467 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
468 || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) {
469 pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
470 sb->s_flags |= SB_RDONLY;
471 }
472 switch (chksum) {
473 case MUFS_FS:
474 case MUFS_INTLFFS:
475 case MUFS_DCFFS:
476 affs_set_opt(sbi->s_flags, SF_MUFS);
477 /* fall thru */
478 case FS_INTLFFS:
479 case FS_DCFFS:
480 affs_set_opt(sbi->s_flags, SF_INTL);
481 break;
482 case MUFS_FFS:
483 affs_set_opt(sbi->s_flags, SF_MUFS);
484 break;
485 case FS_FFS:
486 break;
487 case MUFS_OFS:
488 affs_set_opt(sbi->s_flags, SF_MUFS);
489 /* fall thru */
490 case FS_OFS:
491 affs_set_opt(sbi->s_flags, SF_OFS);
492 sb->s_flags |= SB_NOEXEC;
493 break;
494 case MUFS_DCOFS:
495 case MUFS_INTLOFS:
496 affs_set_opt(sbi->s_flags, SF_MUFS);
497 case FS_DCOFS:
498 case FS_INTLOFS:
499 affs_set_opt(sbi->s_flags, SF_INTL);
500 affs_set_opt(sbi->s_flags, SF_OFS);
501 sb->s_flags |= SB_NOEXEC;
502 break;
503 default:
504 pr_err("Unknown filesystem on device %s: %08X\n",
505 sb->s_id, chksum);
506 return -EINVAL;
507 }
508
509 if (affs_test_opt(mount_flags, SF_VERBOSE)) {
510 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
511 pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
512 len > 31 ? 31 : len,
513 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
514 sig, sig[3] + '0', blocksize);
515 }
516
517 sb->s_flags |= SB_NODEV | SB_NOSUID;
518
519 sbi->s_data_blksize = sb->s_blocksize;
520 if (affs_test_opt(sbi->s_flags, SF_OFS))
521 sbi->s_data_blksize -= 24;
522
523 tmp_flags = sb->s_flags;
524 ret = affs_init_bitmap(sb, &tmp_flags);
525 if (ret)
526 return ret;
527 sb->s_flags = tmp_flags;
528
529 /* set up enough so that it can read an inode */
530
531 root_inode = affs_iget(sb, root_block);
532 if (IS_ERR(root_inode))
533 return PTR_ERR(root_inode);
534
535 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
536 sb->s_d_op = &affs_intl_dentry_operations;
537 else
538 sb->s_d_op = &affs_dentry_operations;
539
540 sb->s_root = d_make_root(root_inode);
541 if (!sb->s_root) {
542 pr_err("AFFS: Get root inode failed\n");
543 return -ENOMEM;
544 }
545
546 sb->s_export_op = &affs_export_ops;
547 pr_debug("s_flags=%lX\n", sb->s_flags);
548 return 0;
549}
550
551static int
552affs_remount(struct super_block *sb, int *flags, char *data)
553{
554 struct affs_sb_info *sbi = AFFS_SB(sb);
555 int blocksize;
556 kuid_t uid;
557 kgid_t gid;
558 int mode;
559 int reserved;
560 int root_block;
561 unsigned long mount_flags;
562 int res = 0;
563 char *new_opts;
564 char volume[32];
565 char *prefix = NULL;
566
567 new_opts = kstrdup(data, GFP_KERNEL);
568 if (data && !new_opts)
569 return -ENOMEM;
570
571 pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
572
573 sync_filesystem(sb);
574 *flags |= SB_NODIRATIME;
575
576 memcpy(volume, sbi->s_volume, 32);
577 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
578 &blocksize, &prefix, volume,
579 &mount_flags)) {
580 kfree(prefix);
581 kfree(new_opts);
582 return -EINVAL;
583 }
584
585 flush_delayed_work(&sbi->sb_work);
586
587 sbi->s_flags = mount_flags;
588 sbi->s_mode = mode;
589 sbi->s_uid = uid;
590 sbi->s_gid = gid;
591 /* protect against readers */
592 spin_lock(&sbi->symlink_lock);
593 if (prefix) {
594 kfree(sbi->s_prefix);
595 sbi->s_prefix = prefix;
596 }
597 memcpy(sbi->s_volume, volume, 32);
598 spin_unlock(&sbi->symlink_lock);
599
600 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
601 return 0;
602
603 if (*flags & SB_RDONLY)
604 affs_free_bitmap(sb);
605 else
606 res = affs_init_bitmap(sb, flags);
607
608 return res;
609}
610
611static int
612affs_statfs(struct dentry *dentry, struct kstatfs *buf)
613{
614 struct super_block *sb = dentry->d_sb;
615 int free;
616 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
617
618 pr_debug("%s() partsize=%d, reserved=%d\n",
619 __func__, AFFS_SB(sb)->s_partition_size,
620 AFFS_SB(sb)->s_reserved);
621
622 free = affs_count_free_blocks(sb);
623 buf->f_type = AFFS_SUPER_MAGIC;
624 buf->f_bsize = sb->s_blocksize;
625 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
626 buf->f_bfree = free;
627 buf->f_bavail = free;
628 buf->f_fsid.val[0] = (u32)id;
629 buf->f_fsid.val[1] = (u32)(id >> 32);
630 buf->f_namelen = AFFSNAMEMAX;
631 return 0;
632}
633
634static struct dentry *affs_mount(struct file_system_type *fs_type,
635 int flags, const char *dev_name, void *data)
636{
637 return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
638}
639
640static void affs_kill_sb(struct super_block *sb)
641{
642 struct affs_sb_info *sbi = AFFS_SB(sb);
643 kill_block_super(sb);
644 if (sbi) {
645 affs_free_bitmap(sb);
646 affs_brelse(sbi->s_root_bh);
647 kfree(sbi->s_prefix);
648 mutex_destroy(&sbi->s_bmlock);
649 kfree(sbi);
650 }
651}
652
653static struct file_system_type affs_fs_type = {
654 .owner = THIS_MODULE,
655 .name = "affs",
656 .mount = affs_mount,
657 .kill_sb = affs_kill_sb,
658 .fs_flags = FS_REQUIRES_DEV,
659};
660MODULE_ALIAS_FS("affs");
661
662static int __init init_affs_fs(void)
663{
664 int err = init_inodecache();
665 if (err)
666 goto out1;
667 err = register_filesystem(&affs_fs_type);
668 if (err)
669 goto out;
670 return 0;
671out:
672 destroy_inodecache();
673out1:
674 return err;
675}
676
677static void __exit exit_affs_fs(void)
678{
679 unregister_filesystem(&affs_fs_type);
680 destroy_inodecache();
681}
682
683MODULE_DESCRIPTION("Amiga filesystem support for Linux");
684MODULE_LICENSE("GPL");
685
686module_init(init_affs_fs)
687module_exit(exit_affs_fs)