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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// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/affs/inode.c
4 *
5 * (c) 1996 Hans-Joachim Widmaier - Rewritten
6 *
7 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
8 *
9 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
10 *
11 * (C) 1991 Linus Torvalds - minix filesystem
12 */
13
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/statfs.h>
17#include <linux/fs_parser.h>
18#include <linux/fs_context.h>
19#include <linux/magic.h>
20#include <linux/sched.h>
21#include <linux/cred.h>
22#include <linux/slab.h>
23#include <linux/writeback.h>
24#include <linux/blkdev.h>
25#include <linux/seq_file.h>
26#include <linux/iversion.h>
27#include "affs.h"
28
29static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
30static int affs_show_options(struct seq_file *m, struct dentry *root);
31
32static void
33affs_commit_super(struct super_block *sb, int wait)
34{
35 struct affs_sb_info *sbi = AFFS_SB(sb);
36 struct buffer_head *bh = sbi->s_root_bh;
37 struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
38
39 lock_buffer(bh);
40 affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
41 affs_fix_checksum(sb, bh);
42 unlock_buffer(bh);
43
44 mark_buffer_dirty(bh);
45 if (wait)
46 sync_dirty_buffer(bh);
47}
48
49static void
50affs_put_super(struct super_block *sb)
51{
52 struct affs_sb_info *sbi = AFFS_SB(sb);
53 pr_debug("%s()\n", __func__);
54
55 cancel_delayed_work_sync(&sbi->sb_work);
56}
57
58static int
59affs_sync_fs(struct super_block *sb, int wait)
60{
61 affs_commit_super(sb, wait);
62 return 0;
63}
64
65static void flush_superblock(struct work_struct *work)
66{
67 struct affs_sb_info *sbi;
68 struct super_block *sb;
69
70 sbi = container_of(work, struct affs_sb_info, sb_work.work);
71 sb = sbi->sb;
72
73 spin_lock(&sbi->work_lock);
74 sbi->work_queued = 0;
75 spin_unlock(&sbi->work_lock);
76
77 affs_commit_super(sb, 1);
78}
79
80void affs_mark_sb_dirty(struct super_block *sb)
81{
82 struct affs_sb_info *sbi = AFFS_SB(sb);
83 unsigned long delay;
84
85 if (sb_rdonly(sb))
86 return;
87
88 spin_lock(&sbi->work_lock);
89 if (!sbi->work_queued) {
90 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
91 queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
92 sbi->work_queued = 1;
93 }
94 spin_unlock(&sbi->work_lock);
95}
96
97static struct kmem_cache * affs_inode_cachep;
98
99static struct inode *affs_alloc_inode(struct super_block *sb)
100{
101 struct affs_inode_info *i;
102
103 i = alloc_inode_sb(sb, affs_inode_cachep, GFP_KERNEL);
104 if (!i)
105 return NULL;
106
107 inode_set_iversion(&i->vfs_inode, 1);
108 i->i_lc = NULL;
109 i->i_ext_bh = NULL;
110 i->i_pa_cnt = 0;
111
112 return &i->vfs_inode;
113}
114
115static void affs_free_inode(struct inode *inode)
116{
117 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
118}
119
120static void init_once(void *foo)
121{
122 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
123
124 mutex_init(&ei->i_link_lock);
125 mutex_init(&ei->i_ext_lock);
126 inode_init_once(&ei->vfs_inode);
127}
128
129static int __init init_inodecache(void)
130{
131 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
132 sizeof(struct affs_inode_info),
133 0, (SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT),
134 init_once);
135 if (affs_inode_cachep == NULL)
136 return -ENOMEM;
137 return 0;
138}
139
140static void destroy_inodecache(void)
141{
142 /*
143 * Make sure all delayed rcu free inodes are flushed before we
144 * destroy cache.
145 */
146 rcu_barrier();
147 kmem_cache_destroy(affs_inode_cachep);
148}
149
150static const struct super_operations affs_sops = {
151 .alloc_inode = affs_alloc_inode,
152 .free_inode = affs_free_inode,
153 .write_inode = affs_write_inode,
154 .evict_inode = affs_evict_inode,
155 .put_super = affs_put_super,
156 .sync_fs = affs_sync_fs,
157 .statfs = affs_statfs,
158 .show_options = affs_show_options,
159};
160
161enum {
162 Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
163 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
164 Opt_verbose, Opt_volume, Opt_ignore,
165};
166
167struct affs_context {
168 kuid_t uid; /* uid to override */
169 kgid_t gid; /* gid to override */
170 unsigned int mode; /* mode to override */
171 unsigned int reserved; /* Number of reserved blocks */
172 int root_block; /* FFS root block number */
173 int blocksize; /* Initial device blksize */
174 char *prefix; /* Prefix for volumes and assigns */
175 char volume[32]; /* Vol. prefix for absolute symlinks */
176 unsigned long mount_flags; /* Options */
177};
178
179static const struct fs_parameter_spec affs_param_spec[] = {
180 fsparam_u32 ("bs", Opt_bs),
181 fsparam_u32oct ("mode", Opt_mode),
182 fsparam_flag ("mufs", Opt_mufs),
183 fsparam_flag ("nofilenametruncate", Opt_notruncate),
184 fsparam_string ("prefix", Opt_prefix),
185 fsparam_flag ("protect", Opt_protect),
186 fsparam_u32 ("reserved", Opt_reserved),
187 fsparam_u32 ("root", Opt_root),
188 fsparam_gid ("setgid", Opt_setgid),
189 fsparam_uid ("setuid", Opt_setuid),
190 fsparam_flag ("verbose", Opt_verbose),
191 fsparam_string ("volume", Opt_volume),
192 fsparam_flag ("grpquota", Opt_ignore),
193 fsparam_flag ("noquota", Opt_ignore),
194 fsparam_flag ("quota", Opt_ignore),
195 fsparam_flag ("usrquota", Opt_ignore),
196 {},
197};
198
199static int affs_parse_param(struct fs_context *fc, struct fs_parameter *param)
200{
201 struct affs_context *ctx = fc->fs_private;
202 struct fs_parse_result result;
203 int n;
204 int opt;
205
206 opt = fs_parse(fc, affs_param_spec, param, &result);
207 if (opt < 0)
208 return opt;
209
210 switch (opt) {
211 case Opt_bs:
212 n = result.uint_32;
213 if (n != 512 && n != 1024 && n != 2048
214 && n != 4096) {
215 pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
216 return -EINVAL;
217 }
218 ctx->blocksize = n;
219 break;
220 case Opt_mode:
221 ctx->mode = result.uint_32 & 0777;
222 affs_set_opt(ctx->mount_flags, SF_SETMODE);
223 break;
224 case Opt_mufs:
225 affs_set_opt(ctx->mount_flags, SF_MUFS);
226 break;
227 case Opt_notruncate:
228 affs_set_opt(ctx->mount_flags, SF_NO_TRUNCATE);
229 break;
230 case Opt_prefix:
231 kfree(ctx->prefix);
232 ctx->prefix = param->string;
233 param->string = NULL;
234 affs_set_opt(ctx->mount_flags, SF_PREFIX);
235 break;
236 case Opt_protect:
237 affs_set_opt(ctx->mount_flags, SF_IMMUTABLE);
238 break;
239 case Opt_reserved:
240 ctx->reserved = result.uint_32;
241 break;
242 case Opt_root:
243 ctx->root_block = result.uint_32;
244 break;
245 case Opt_setgid:
246 ctx->gid = result.gid;
247 affs_set_opt(ctx->mount_flags, SF_SETGID);
248 break;
249 case Opt_setuid:
250 ctx->uid = result.uid;
251 affs_set_opt(ctx->mount_flags, SF_SETUID);
252 break;
253 case Opt_verbose:
254 affs_set_opt(ctx->mount_flags, SF_VERBOSE);
255 break;
256 case Opt_volume:
257 strscpy(ctx->volume, param->string, 32);
258 break;
259 case Opt_ignore:
260 /* Silently ignore the quota options */
261 break;
262 default:
263 return -EINVAL;
264 }
265 return 0;
266}
267
268static int affs_show_options(struct seq_file *m, struct dentry *root)
269{
270 struct super_block *sb = root->d_sb;
271 struct affs_sb_info *sbi = AFFS_SB(sb);
272
273 if (sb->s_blocksize)
274 seq_printf(m, ",bs=%lu", sb->s_blocksize);
275 if (affs_test_opt(sbi->s_flags, SF_SETMODE))
276 seq_printf(m, ",mode=%o", sbi->s_mode);
277 if (affs_test_opt(sbi->s_flags, SF_MUFS))
278 seq_puts(m, ",mufs");
279 if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE))
280 seq_puts(m, ",nofilenametruncate");
281 if (affs_test_opt(sbi->s_flags, SF_PREFIX))
282 seq_printf(m, ",prefix=%s", sbi->s_prefix);
283 if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE))
284 seq_puts(m, ",protect");
285 if (sbi->s_reserved != 2)
286 seq_printf(m, ",reserved=%u", sbi->s_reserved);
287 if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2)
288 seq_printf(m, ",root=%u", sbi->s_root_block);
289 if (affs_test_opt(sbi->s_flags, SF_SETGID))
290 seq_printf(m, ",setgid=%u",
291 from_kgid_munged(&init_user_ns, sbi->s_gid));
292 if (affs_test_opt(sbi->s_flags, SF_SETUID))
293 seq_printf(m, ",setuid=%u",
294 from_kuid_munged(&init_user_ns, sbi->s_uid));
295 if (affs_test_opt(sbi->s_flags, SF_VERBOSE))
296 seq_puts(m, ",verbose");
297 if (sbi->s_volume[0])
298 seq_printf(m, ",volume=%s", sbi->s_volume);
299 return 0;
300}
301
302/* This function definitely needs to be split up. Some fine day I'll
303 * hopefully have the guts to do so. Until then: sorry for the mess.
304 */
305
306static int affs_fill_super(struct super_block *sb, struct fs_context *fc)
307{
308 struct affs_sb_info *sbi;
309 struct affs_context *ctx = fc->fs_private;
310 struct buffer_head *root_bh = NULL;
311 struct buffer_head *boot_bh;
312 struct inode *root_inode = NULL;
313 int silent = fc->sb_flags & SB_SILENT;
314 int size, blocksize;
315 u32 chksum;
316 int num_bm;
317 int i, j;
318 int tmp_flags; /* fix remount prototype... */
319 u8 sig[4];
320 int ret;
321
322 sb->s_magic = AFFS_SUPER_MAGIC;
323 sb->s_op = &affs_sops;
324 sb->s_flags |= SB_NODIRATIME;
325
326 sb->s_time_gran = NSEC_PER_SEC;
327 sb->s_time_min = sys_tz.tz_minuteswest * 60 + AFFS_EPOCH_DELTA;
328 sb->s_time_max = 86400LL * U32_MAX + 86400 + sb->s_time_min;
329
330 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
331 if (!sbi)
332 return -ENOMEM;
333
334 sb->s_fs_info = sbi;
335 sbi->sb = sb;
336 mutex_init(&sbi->s_bmlock);
337 spin_lock_init(&sbi->symlink_lock);
338 spin_lock_init(&sbi->work_lock);
339 INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
340
341 sbi->s_flags = ctx->mount_flags;
342 sbi->s_mode = ctx->mode;
343 sbi->s_uid = ctx->uid;
344 sbi->s_gid = ctx->gid;
345 sbi->s_reserved = ctx->reserved;
346 sbi->s_prefix = ctx->prefix;
347 ctx->prefix = NULL;
348 memcpy(sbi->s_volume, ctx->volume, 32);
349
350 /* N.B. after this point s_prefix must be released */
351
352 /* Get the size of the device in 512-byte blocks.
353 * If we later see that the partition uses bigger
354 * blocks, we will have to change it.
355 */
356
357 size = bdev_nr_sectors(sb->s_bdev);
358 pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
359
360 affs_set_blocksize(sb, PAGE_SIZE);
361 /* Try to find root block. Its location depends on the block size. */
362
363 i = bdev_logical_block_size(sb->s_bdev);
364 j = PAGE_SIZE;
365 blocksize = ctx->blocksize;
366 if (blocksize > 0) {
367 i = j = blocksize;
368 size = size / (blocksize / 512);
369 }
370
371 for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
372 sbi->s_root_block = ctx->root_block;
373 if (ctx->root_block < 0)
374 sbi->s_root_block = (ctx->reserved + size - 1) / 2;
375 pr_debug("setting blocksize to %d\n", blocksize);
376 affs_set_blocksize(sb, blocksize);
377 sbi->s_partition_size = size;
378
379 /* The root block location that was calculated above is not
380 * correct if the partition size is an odd number of 512-
381 * byte blocks, which will be rounded down to a number of
382 * 1024-byte blocks, and if there were an even number of
383 * reserved blocks. Ideally, all partition checkers should
384 * report the real number of blocks of the real blocksize,
385 * but since this just cannot be done, we have to try to
386 * find the root block anyways. In the above case, it is one
387 * block behind the calculated one. So we check this one, too.
388 */
389 for (num_bm = 0; num_bm < 2; num_bm++) {
390 pr_debug("Dev %s, trying root=%u, bs=%d, "
391 "size=%d, reserved=%d\n",
392 sb->s_id,
393 sbi->s_root_block + num_bm,
394 ctx->blocksize, size, ctx->reserved);
395 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
396 if (!root_bh)
397 continue;
398 if (!affs_checksum_block(sb, root_bh) &&
399 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
400 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
401 sbi->s_hashsize = blocksize / 4 - 56;
402 sbi->s_root_block += num_bm;
403 goto got_root;
404 }
405 affs_brelse(root_bh);
406 root_bh = NULL;
407 }
408 }
409 if (!silent)
410 pr_err("No valid root block on device %s\n", sb->s_id);
411 return -EINVAL;
412
413 /* N.B. after this point bh must be released */
414got_root:
415 /* Keep super block in cache */
416 sbi->s_root_bh = root_bh;
417 ctx->root_block = sbi->s_root_block;
418
419 /* Find out which kind of FS we have */
420 boot_bh = sb_bread(sb, 0);
421 if (!boot_bh) {
422 pr_err("Cannot read boot block\n");
423 return -EINVAL;
424 }
425 memcpy(sig, boot_bh->b_data, 4);
426 brelse(boot_bh);
427 chksum = be32_to_cpu(*(__be32 *)sig);
428
429 /* Dircache filesystems are compatible with non-dircache ones
430 * when reading. As long as they aren't supported, writing is
431 * not recommended.
432 */
433 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
434 || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) {
435 pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
436 sb->s_flags |= SB_RDONLY;
437 }
438 switch (chksum) {
439 case MUFS_FS:
440 case MUFS_INTLFFS:
441 case MUFS_DCFFS:
442 affs_set_opt(sbi->s_flags, SF_MUFS);
443 fallthrough;
444 case FS_INTLFFS:
445 case FS_DCFFS:
446 affs_set_opt(sbi->s_flags, SF_INTL);
447 break;
448 case MUFS_FFS:
449 affs_set_opt(sbi->s_flags, SF_MUFS);
450 break;
451 case FS_FFS:
452 break;
453 case MUFS_OFS:
454 affs_set_opt(sbi->s_flags, SF_MUFS);
455 fallthrough;
456 case FS_OFS:
457 affs_set_opt(sbi->s_flags, SF_OFS);
458 sb->s_flags |= SB_NOEXEC;
459 break;
460 case MUFS_DCOFS:
461 case MUFS_INTLOFS:
462 affs_set_opt(sbi->s_flags, SF_MUFS);
463 fallthrough;
464 case FS_DCOFS:
465 case FS_INTLOFS:
466 affs_set_opt(sbi->s_flags, SF_INTL);
467 affs_set_opt(sbi->s_flags, SF_OFS);
468 sb->s_flags |= SB_NOEXEC;
469 break;
470 default:
471 pr_err("Unknown filesystem on device %s: %08X\n",
472 sb->s_id, chksum);
473 return -EINVAL;
474 }
475
476 if (affs_test_opt(ctx->mount_flags, SF_VERBOSE)) {
477 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
478 pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
479 len > 31 ? 31 : len,
480 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
481 sig, sig[3] + '0', blocksize);
482 }
483
484 sb->s_flags |= SB_NODEV | SB_NOSUID;
485
486 sbi->s_data_blksize = sb->s_blocksize;
487 if (affs_test_opt(sbi->s_flags, SF_OFS))
488 sbi->s_data_blksize -= 24;
489
490 tmp_flags = sb->s_flags;
491 ret = affs_init_bitmap(sb, &tmp_flags);
492 if (ret)
493 return ret;
494 sb->s_flags = tmp_flags;
495
496 /* set up enough so that it can read an inode */
497
498 root_inode = affs_iget(sb, ctx->root_block);
499 if (IS_ERR(root_inode))
500 return PTR_ERR(root_inode);
501
502 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
503 sb->s_d_op = &affs_intl_dentry_operations;
504 else
505 sb->s_d_op = &affs_dentry_operations;
506
507 sb->s_root = d_make_root(root_inode);
508 if (!sb->s_root) {
509 pr_err("AFFS: Get root inode failed\n");
510 return -ENOMEM;
511 }
512
513 sb->s_export_op = &affs_export_ops;
514 pr_debug("s_flags=%lX\n", sb->s_flags);
515 return 0;
516}
517
518static int affs_reconfigure(struct fs_context *fc)
519{
520 struct super_block *sb = fc->root->d_sb;
521 struct affs_context *ctx = fc->fs_private;
522 struct affs_sb_info *sbi = AFFS_SB(sb);
523 int res = 0;
524
525 sync_filesystem(sb);
526 fc->sb_flags |= SB_NODIRATIME;
527
528 flush_delayed_work(&sbi->sb_work);
529
530 /*
531 * NB: Historically, only mount_flags, mode, uid, gic, prefix,
532 * and volume are accepted during remount.
533 */
534 sbi->s_flags = ctx->mount_flags;
535 sbi->s_mode = ctx->mode;
536 sbi->s_uid = ctx->uid;
537 sbi->s_gid = ctx->gid;
538 /* protect against readers */
539 spin_lock(&sbi->symlink_lock);
540 if (ctx->prefix) {
541 kfree(sbi->s_prefix);
542 sbi->s_prefix = ctx->prefix;
543 ctx->prefix = NULL;
544 }
545 memcpy(sbi->s_volume, ctx->volume, 32);
546 spin_unlock(&sbi->symlink_lock);
547
548 if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb))
549 return 0;
550
551 if (fc->sb_flags & SB_RDONLY)
552 affs_free_bitmap(sb);
553 else
554 res = affs_init_bitmap(sb, &fc->sb_flags);
555
556 return res;
557}
558
559static int
560affs_statfs(struct dentry *dentry, struct kstatfs *buf)
561{
562 struct super_block *sb = dentry->d_sb;
563 int free;
564 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
565
566 pr_debug("%s() partsize=%d, reserved=%d\n",
567 __func__, AFFS_SB(sb)->s_partition_size,
568 AFFS_SB(sb)->s_reserved);
569
570 free = affs_count_free_blocks(sb);
571 buf->f_type = AFFS_SUPER_MAGIC;
572 buf->f_bsize = sb->s_blocksize;
573 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
574 buf->f_bfree = free;
575 buf->f_bavail = free;
576 buf->f_fsid = u64_to_fsid(id);
577 buf->f_namelen = AFFSNAMEMAX;
578 return 0;
579}
580
581static int affs_get_tree(struct fs_context *fc)
582{
583 return get_tree_bdev(fc, affs_fill_super);
584}
585
586static void affs_kill_sb(struct super_block *sb)
587{
588 struct affs_sb_info *sbi = AFFS_SB(sb);
589 kill_block_super(sb);
590 if (sbi) {
591 affs_free_bitmap(sb);
592 affs_brelse(sbi->s_root_bh);
593 kfree(sbi->s_prefix);
594 mutex_destroy(&sbi->s_bmlock);
595 kfree_rcu(sbi, rcu);
596 }
597}
598
599static void affs_free_fc(struct fs_context *fc)
600{
601 struct affs_context *ctx = fc->fs_private;
602
603 kfree(ctx->prefix);
604 kfree(ctx);
605}
606
607static const struct fs_context_operations affs_context_ops = {
608 .parse_param = affs_parse_param,
609 .get_tree = affs_get_tree,
610 .reconfigure = affs_reconfigure,
611 .free = affs_free_fc,
612};
613
614static int affs_init_fs_context(struct fs_context *fc)
615{
616 struct affs_context *ctx;
617
618 ctx = kzalloc(sizeof(struct affs_context), GFP_KERNEL);
619 if (!ctx)
620 return -ENOMEM;
621
622 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
623 struct super_block *sb = fc->root->d_sb;
624 struct affs_sb_info *sbi = AFFS_SB(sb);
625
626 /*
627 * NB: historically, no options other than volume were
628 * preserved across a remount unless they were explicitly
629 * passed in.
630 */
631 memcpy(ctx->volume, sbi->s_volume, 32);
632 } else {
633 ctx->uid = current_uid();
634 ctx->gid = current_gid();
635 ctx->reserved = 2;
636 ctx->root_block = -1;
637 ctx->blocksize = -1;
638 ctx->volume[0] = ':';
639 }
640
641 fc->ops = &affs_context_ops;
642 fc->fs_private = ctx;
643
644 return 0;
645}
646
647static struct file_system_type affs_fs_type = {
648 .owner = THIS_MODULE,
649 .name = "affs",
650 .kill_sb = affs_kill_sb,
651 .fs_flags = FS_REQUIRES_DEV,
652 .init_fs_context = affs_init_fs_context,
653 .parameters = affs_param_spec,
654};
655MODULE_ALIAS_FS("affs");
656
657static int __init init_affs_fs(void)
658{
659 int err = init_inodecache();
660 if (err)
661 goto out1;
662 err = register_filesystem(&affs_fs_type);
663 if (err)
664 goto out;
665 return 0;
666out:
667 destroy_inodecache();
668out1:
669 return err;
670}
671
672static void __exit exit_affs_fs(void)
673{
674 unregister_filesystem(&affs_fs_type);
675 destroy_inodecache();
676}
677
678MODULE_DESCRIPTION("Amiga filesystem support for Linux");
679MODULE_LICENSE("GPL");
680
681module_init(init_affs_fs)
682module_exit(exit_affs_fs)