2 * linux/fs/affs/inode.c
4 * (c) 1996 Hans-Joachim Widmaier - Rewritten
6 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
8 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
10 * (C) 1991 Linus Torvalds - minix filesystem
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>
27 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
28 static int affs_show_options(struct seq_file *m, struct dentry *root);
29 static int affs_remount (struct super_block *sb, int *flags, char *data);
32 affs_commit_super(struct super_block *sb, int wait)
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);
39 affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
40 affs_fix_checksum(sb, bh);
43 mark_buffer_dirty(bh);
45 sync_dirty_buffer(bh);
49 affs_put_super(struct super_block *sb)
51 struct affs_sb_info *sbi = AFFS_SB(sb);
52 pr_debug("%s()\n", __func__);
54 cancel_delayed_work_sync(&sbi->sb_work);
58 affs_sync_fs(struct super_block *sb, int wait)
60 affs_commit_super(sb, wait);
64 static void flush_superblock(struct work_struct *work)
66 struct affs_sb_info *sbi;
67 struct super_block *sb;
69 sbi = container_of(work, struct affs_sb_info, sb_work.work);
72 spin_lock(&sbi->work_lock);
74 spin_unlock(&sbi->work_lock);
76 affs_commit_super(sb, 1);
79 void affs_mark_sb_dirty(struct super_block *sb)
81 struct affs_sb_info *sbi = AFFS_SB(sb);
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);
93 spin_unlock(&sbi->work_lock);
96 static struct kmem_cache * affs_inode_cachep;
98 static struct inode *affs_alloc_inode(struct super_block *sb)
100 struct affs_inode_info *i;
102 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
106 inode_set_iversion(&i->vfs_inode, 1);
111 return &i->vfs_inode;
114 static void affs_free_inode(struct inode *inode)
116 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
119 static void init_once(void *foo)
121 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
123 sema_init(&ei->i_link_lock, 1);
124 sema_init(&ei->i_ext_lock, 1);
125 inode_init_once(&ei->vfs_inode);
128 static int __init init_inodecache(void)
130 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
131 sizeof(struct affs_inode_info),
132 0, (SLAB_RECLAIM_ACCOUNT|
133 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
135 if (affs_inode_cachep == NULL)
140 static void destroy_inodecache(void)
143 * Make sure all delayed rcu free inodes are flushed before we
147 kmem_cache_destroy(affs_inode_cachep);
150 static 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 .remount_fs = affs_remount,
159 .show_options = affs_show_options,
163 Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
164 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
165 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
168 static const match_table_t tokens = {
170 {Opt_mode, "mode=%o"},
172 {Opt_notruncate, "nofilenametruncate"},
173 {Opt_prefix, "prefix=%s"},
174 {Opt_protect, "protect"},
175 {Opt_reserved, "reserved=%u"},
176 {Opt_root, "root=%u"},
177 {Opt_setgid, "setgid=%u"},
178 {Opt_setuid, "setuid=%u"},
179 {Opt_verbose, "verbose"},
180 {Opt_volume, "volume=%s"},
181 {Opt_ignore, "grpquota"},
182 {Opt_ignore, "noquota"},
183 {Opt_ignore, "quota"},
184 {Opt_ignore, "usrquota"},
189 parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root,
190 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
193 substring_t args[MAX_OPT_ARGS];
195 /* Fill in defaults */
197 *uid = current_uid();
198 *gid = current_gid();
208 while ((p = strsep(&options, ",")) != NULL) {
209 int token, n, option;
213 token = match_token(p, tokens, args);
216 if (match_int(&args[0], &n))
218 if (n != 512 && n != 1024 && n != 2048
220 pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
226 if (match_octal(&args[0], &option))
228 *mode = option & 0777;
229 affs_set_opt(*mount_opts, SF_SETMODE);
232 affs_set_opt(*mount_opts, SF_MUFS);
235 affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
239 *prefix = match_strdup(&args[0]);
242 affs_set_opt(*mount_opts, SF_PREFIX);
245 affs_set_opt(*mount_opts, SF_IMMUTABLE);
248 if (match_int(&args[0], reserved))
252 if (match_int(&args[0], root))
256 if (match_int(&args[0], &option))
258 *gid = make_kgid(current_user_ns(), option);
259 if (!gid_valid(*gid))
261 affs_set_opt(*mount_opts, SF_SETGID);
264 if (match_int(&args[0], &option))
266 *uid = make_kuid(current_user_ns(), option);
267 if (!uid_valid(*uid))
269 affs_set_opt(*mount_opts, SF_SETUID);
272 affs_set_opt(*mount_opts, SF_VERBOSE);
275 char *vol = match_strdup(&args[0]);
278 strlcpy(volume, vol, 32);
283 /* Silently ignore the quota options */
286 pr_warn("Unrecognized mount option \"%s\" or missing value\n",
294 static int affs_show_options(struct seq_file *m, struct dentry *root)
296 struct super_block *sb = root->d_sb;
297 struct affs_sb_info *sbi = AFFS_SB(sb);
300 seq_printf(m, ",bs=%lu", sb->s_blocksize);
301 if (affs_test_opt(sbi->s_flags, SF_SETMODE))
302 seq_printf(m, ",mode=%o", sbi->s_mode);
303 if (affs_test_opt(sbi->s_flags, SF_MUFS))
304 seq_puts(m, ",mufs");
305 if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE))
306 seq_puts(m, ",nofilenametruncate");
307 if (affs_test_opt(sbi->s_flags, SF_PREFIX))
308 seq_printf(m, ",prefix=%s", sbi->s_prefix);
309 if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE))
310 seq_puts(m, ",protect");
311 if (sbi->s_reserved != 2)
312 seq_printf(m, ",reserved=%u", sbi->s_reserved);
313 if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2)
314 seq_printf(m, ",root=%u", sbi->s_root_block);
315 if (affs_test_opt(sbi->s_flags, SF_SETGID))
316 seq_printf(m, ",setgid=%u",
317 from_kgid_munged(&init_user_ns, sbi->s_gid));
318 if (affs_test_opt(sbi->s_flags, SF_SETUID))
319 seq_printf(m, ",setuid=%u",
320 from_kuid_munged(&init_user_ns, sbi->s_uid));
321 if (affs_test_opt(sbi->s_flags, SF_VERBOSE))
322 seq_puts(m, ",verbose");
323 if (sbi->s_volume[0])
324 seq_printf(m, ",volume=%s", sbi->s_volume);
328 /* This function definitely needs to be split up. Some fine day I'll
329 * hopefully have the guts to do so. Until then: sorry for the mess.
332 static int affs_fill_super(struct super_block *sb, void *data, int silent)
334 struct affs_sb_info *sbi;
335 struct buffer_head *root_bh = NULL;
336 struct buffer_head *boot_bh;
337 struct inode *root_inode = NULL;
346 unsigned long mount_flags;
347 int tmp_flags; /* fix remount prototype... */
351 pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
353 sb->s_magic = AFFS_SUPER_MAGIC;
354 sb->s_op = &affs_sops;
355 sb->s_flags |= SB_NODIRATIME;
357 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
363 mutex_init(&sbi->s_bmlock);
364 spin_lock_init(&sbi->symlink_lock);
365 spin_lock_init(&sbi->work_lock);
366 INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
368 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
369 &blocksize,&sbi->s_prefix,
370 sbi->s_volume, &mount_flags)) {
371 pr_err("Error parsing options\n");
374 /* N.B. after this point s_prefix must be released */
376 sbi->s_flags = mount_flags;
380 sbi->s_reserved= reserved;
382 /* Get the size of the device in 512-byte blocks.
383 * If we later see that the partition uses bigger
384 * blocks, we will have to change it.
387 size = i_size_read(sb->s_bdev->bd_inode) >> 9;
388 pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
390 affs_set_blocksize(sb, PAGE_SIZE);
391 /* Try to find root block. Its location depends on the block size. */
393 i = bdev_logical_block_size(sb->s_bdev);
397 size = size / (blocksize / 512);
400 for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
401 sbi->s_root_block = root_block;
403 sbi->s_root_block = (reserved + size - 1) / 2;
404 pr_debug("setting blocksize to %d\n", blocksize);
405 affs_set_blocksize(sb, blocksize);
406 sbi->s_partition_size = size;
408 /* The root block location that was calculated above is not
409 * correct if the partition size is an odd number of 512-
410 * byte blocks, which will be rounded down to a number of
411 * 1024-byte blocks, and if there were an even number of
412 * reserved blocks. Ideally, all partition checkers should
413 * report the real number of blocks of the real blocksize,
414 * but since this just cannot be done, we have to try to
415 * find the root block anyways. In the above case, it is one
416 * block behind the calculated one. So we check this one, too.
418 for (num_bm = 0; num_bm < 2; num_bm++) {
419 pr_debug("Dev %s, trying root=%u, bs=%d, "
420 "size=%d, reserved=%d\n",
422 sbi->s_root_block + num_bm,
423 blocksize, size, reserved);
424 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
427 if (!affs_checksum_block(sb, root_bh) &&
428 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
429 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
430 sbi->s_hashsize = blocksize / 4 - 56;
431 sbi->s_root_block += num_bm;
434 affs_brelse(root_bh);
439 pr_err("No valid root block on device %s\n", sb->s_id);
442 /* N.B. after this point bh must be released */
444 /* Keep super block in cache */
445 sbi->s_root_bh = root_bh;
446 root_block = sbi->s_root_block;
448 /* Find out which kind of FS we have */
449 boot_bh = sb_bread(sb, 0);
451 pr_err("Cannot read boot block\n");
454 memcpy(sig, boot_bh->b_data, 4);
456 chksum = be32_to_cpu(*(__be32 *)sig);
458 /* Dircache filesystems are compatible with non-dircache ones
459 * when reading. As long as they aren't supported, writing is
462 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
463 || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) {
464 pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
465 sb->s_flags |= SB_RDONLY;
471 affs_set_opt(sbi->s_flags, SF_MUFS);
475 affs_set_opt(sbi->s_flags, SF_INTL);
478 affs_set_opt(sbi->s_flags, SF_MUFS);
483 affs_set_opt(sbi->s_flags, SF_MUFS);
486 affs_set_opt(sbi->s_flags, SF_OFS);
487 sb->s_flags |= SB_NOEXEC;
491 affs_set_opt(sbi->s_flags, SF_MUFS);
495 affs_set_opt(sbi->s_flags, SF_INTL);
496 affs_set_opt(sbi->s_flags, SF_OFS);
497 sb->s_flags |= SB_NOEXEC;
500 pr_err("Unknown filesystem on device %s: %08X\n",
505 if (affs_test_opt(mount_flags, SF_VERBOSE)) {
506 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
507 pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
509 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
510 sig, sig[3] + '0', blocksize);
513 sb->s_flags |= SB_NODEV | SB_NOSUID;
515 sbi->s_data_blksize = sb->s_blocksize;
516 if (affs_test_opt(sbi->s_flags, SF_OFS))
517 sbi->s_data_blksize -= 24;
519 tmp_flags = sb->s_flags;
520 ret = affs_init_bitmap(sb, &tmp_flags);
523 sb->s_flags = tmp_flags;
525 /* set up enough so that it can read an inode */
527 root_inode = affs_iget(sb, root_block);
528 if (IS_ERR(root_inode))
529 return PTR_ERR(root_inode);
531 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
532 sb->s_d_op = &affs_intl_dentry_operations;
534 sb->s_d_op = &affs_dentry_operations;
536 sb->s_root = d_make_root(root_inode);
538 pr_err("AFFS: Get root inode failed\n");
542 sb->s_export_op = &affs_export_ops;
543 pr_debug("s_flags=%lX\n", sb->s_flags);
548 affs_remount(struct super_block *sb, int *flags, char *data)
550 struct affs_sb_info *sbi = AFFS_SB(sb);
557 unsigned long mount_flags;
563 new_opts = kstrdup(data, GFP_KERNEL);
564 if (data && !new_opts)
567 pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
570 *flags |= SB_NODIRATIME;
572 memcpy(volume, sbi->s_volume, 32);
573 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
574 &blocksize, &prefix, volume,
581 flush_delayed_work(&sbi->sb_work);
583 sbi->s_flags = mount_flags;
587 /* protect against readers */
588 spin_lock(&sbi->symlink_lock);
590 kfree(sbi->s_prefix);
591 sbi->s_prefix = prefix;
593 memcpy(sbi->s_volume, volume, 32);
594 spin_unlock(&sbi->symlink_lock);
596 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
599 if (*flags & SB_RDONLY)
600 affs_free_bitmap(sb);
602 res = affs_init_bitmap(sb, flags);
608 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
610 struct super_block *sb = dentry->d_sb;
612 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
614 pr_debug("%s() partsize=%d, reserved=%d\n",
615 __func__, AFFS_SB(sb)->s_partition_size,
616 AFFS_SB(sb)->s_reserved);
618 free = affs_count_free_blocks(sb);
619 buf->f_type = AFFS_SUPER_MAGIC;
620 buf->f_bsize = sb->s_blocksize;
621 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
623 buf->f_bavail = free;
624 buf->f_fsid.val[0] = (u32)id;
625 buf->f_fsid.val[1] = (u32)(id >> 32);
626 buf->f_namelen = AFFSNAMEMAX;
630 static struct dentry *affs_mount(struct file_system_type *fs_type,
631 int flags, const char *dev_name, void *data)
633 return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
636 static void affs_kill_sb(struct super_block *sb)
638 struct affs_sb_info *sbi = AFFS_SB(sb);
639 kill_block_super(sb);
641 affs_free_bitmap(sb);
642 affs_brelse(sbi->s_root_bh);
643 kfree(sbi->s_prefix);
644 mutex_destroy(&sbi->s_bmlock);
649 static struct file_system_type affs_fs_type = {
650 .owner = THIS_MODULE,
653 .kill_sb = affs_kill_sb,
654 .fs_flags = FS_REQUIRES_DEV,
656 MODULE_ALIAS_FS("affs");
658 static int __init init_affs_fs(void)
660 int err = init_inodecache();
663 err = register_filesystem(&affs_fs_type);
668 destroy_inodecache();
673 static void __exit exit_affs_fs(void)
675 unregister_filesystem(&affs_fs_type);
676 destroy_inodecache();
679 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
680 MODULE_LICENSE("GPL");
682 module_init(init_affs_fs)
683 module_exit(exit_affs_fs)