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>
25 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
26 static int affs_remount (struct super_block *sb, int *flags, char *data);
29 affs_commit_super(struct super_block *sb, int wait)
31 struct affs_sb_info *sbi = AFFS_SB(sb);
32 struct buffer_head *bh = sbi->s_root_bh;
33 struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
36 affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
37 affs_fix_checksum(sb, bh);
40 mark_buffer_dirty(bh);
42 sync_dirty_buffer(bh);
46 affs_put_super(struct super_block *sb)
48 struct affs_sb_info *sbi = AFFS_SB(sb);
49 pr_debug("%s()\n", __func__);
51 cancel_delayed_work_sync(&sbi->sb_work);
55 affs_sync_fs(struct super_block *sb, int wait)
57 affs_commit_super(sb, wait);
61 static void flush_superblock(struct work_struct *work)
63 struct affs_sb_info *sbi;
64 struct super_block *sb;
66 sbi = container_of(work, struct affs_sb_info, sb_work.work);
69 spin_lock(&sbi->work_lock);
71 spin_unlock(&sbi->work_lock);
73 affs_commit_super(sb, 1);
76 void affs_mark_sb_dirty(struct super_block *sb)
78 struct affs_sb_info *sbi = AFFS_SB(sb);
81 if (sb->s_flags & MS_RDONLY)
84 spin_lock(&sbi->work_lock);
85 if (!sbi->work_queued) {
86 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
87 queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
90 spin_unlock(&sbi->work_lock);
93 static struct kmem_cache * affs_inode_cachep;
95 static struct inode *affs_alloc_inode(struct super_block *sb)
97 struct affs_inode_info *i;
99 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
103 i->vfs_inode.i_version = 1;
108 return &i->vfs_inode;
111 static void affs_i_callback(struct rcu_head *head)
113 struct inode *inode = container_of(head, struct inode, i_rcu);
114 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
117 static void affs_destroy_inode(struct inode *inode)
119 call_rcu(&inode->i_rcu, affs_i_callback);
122 static void init_once(void *foo)
124 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
126 sema_init(&ei->i_link_lock, 1);
127 sema_init(&ei->i_ext_lock, 1);
128 inode_init_once(&ei->vfs_inode);
131 static int __init init_inodecache(void)
133 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
134 sizeof(struct affs_inode_info),
135 0, (SLAB_RECLAIM_ACCOUNT|
136 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
138 if (affs_inode_cachep == NULL)
143 static void destroy_inodecache(void)
146 * Make sure all delayed rcu free inodes are flushed before we
150 kmem_cache_destroy(affs_inode_cachep);
153 static const struct super_operations affs_sops = {
154 .alloc_inode = affs_alloc_inode,
155 .destroy_inode = affs_destroy_inode,
156 .write_inode = affs_write_inode,
157 .evict_inode = affs_evict_inode,
158 .put_super = affs_put_super,
159 .sync_fs = affs_sync_fs,
160 .statfs = affs_statfs,
161 .remount_fs = affs_remount,
162 .show_options = generic_show_options,
166 Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
167 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
168 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
171 static const match_table_t tokens = {
173 {Opt_mode, "mode=%o"},
175 {Opt_notruncate, "nofilenametruncate"},
176 {Opt_prefix, "prefix=%s"},
177 {Opt_protect, "protect"},
178 {Opt_reserved, "reserved=%u"},
179 {Opt_root, "root=%u"},
180 {Opt_setgid, "setgid=%u"},
181 {Opt_setuid, "setuid=%u"},
182 {Opt_verbose, "verbose"},
183 {Opt_volume, "volume=%s"},
184 {Opt_ignore, "grpquota"},
185 {Opt_ignore, "noquota"},
186 {Opt_ignore, "quota"},
187 {Opt_ignore, "usrquota"},
192 parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root,
193 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
196 substring_t args[MAX_OPT_ARGS];
198 /* Fill in defaults */
200 *uid = current_uid();
201 *gid = current_gid();
211 while ((p = strsep(&options, ",")) != NULL) {
212 int token, n, option;
216 token = match_token(p, tokens, args);
219 if (match_int(&args[0], &n))
221 if (n != 512 && n != 1024 && n != 2048
223 pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
229 if (match_octal(&args[0], &option))
231 *mode = option & 0777;
232 affs_set_opt(*mount_opts, SF_SETMODE);
235 affs_set_opt(*mount_opts, SF_MUFS);
238 affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
241 *prefix = match_strdup(&args[0]);
244 affs_set_opt(*mount_opts, SF_PREFIX);
247 affs_set_opt(*mount_opts, SF_IMMUTABLE);
250 if (match_int(&args[0], reserved))
254 if (match_int(&args[0], root))
258 if (match_int(&args[0], &option))
260 *gid = make_kgid(current_user_ns(), option);
261 if (!gid_valid(*gid))
263 affs_set_opt(*mount_opts, SF_SETGID);
266 if (match_int(&args[0], &option))
268 *uid = make_kuid(current_user_ns(), option);
269 if (!uid_valid(*uid))
271 affs_set_opt(*mount_opts, SF_SETUID);
274 affs_set_opt(*mount_opts, SF_VERBOSE);
277 char *vol = match_strdup(&args[0]);
280 strlcpy(volume, vol, 32);
285 /* Silently ignore the quota options */
288 pr_warn("Unrecognized mount option \"%s\" or missing value\n",
296 /* This function definitely needs to be split up. Some fine day I'll
297 * hopefully have the guts to do so. Until then: sorry for the mess.
300 static int affs_fill_super(struct super_block *sb, void *data, int silent)
302 struct affs_sb_info *sbi;
303 struct buffer_head *root_bh = NULL;
304 struct buffer_head *boot_bh;
305 struct inode *root_inode = NULL;
314 unsigned long mount_flags;
315 int tmp_flags; /* fix remount prototype... */
319 save_mount_options(sb, data);
321 pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
323 sb->s_magic = AFFS_SUPER_MAGIC;
324 sb->s_op = &affs_sops;
325 sb->s_flags |= MS_NODIRATIME;
327 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
333 mutex_init(&sbi->s_bmlock);
334 spin_lock_init(&sbi->symlink_lock);
335 spin_lock_init(&sbi->work_lock);
336 INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
338 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
339 &blocksize,&sbi->s_prefix,
340 sbi->s_volume, &mount_flags)) {
341 pr_err("Error parsing options\n");
344 /* N.B. after this point s_prefix must be released */
346 sbi->s_flags = mount_flags;
350 sbi->s_reserved= reserved;
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.
357 size = i_size_read(sb->s_bdev->bd_inode) >> 9;
358 pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
360 affs_set_blocksize(sb, PAGE_SIZE);
361 /* Try to find root block. Its location depends on the block size. */
363 i = bdev_logical_block_size(sb->s_bdev);
367 size = size / (blocksize / 512);
370 for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
371 sbi->s_root_block = root_block;
373 sbi->s_root_block = (reserved + size - 1) / 2;
374 pr_debug("setting blocksize to %d\n", blocksize);
375 affs_set_blocksize(sb, blocksize);
376 sbi->s_partition_size = size;
378 /* The root block location that was calculated above is not
379 * correct if the partition size is an odd number of 512-
380 * byte blocks, which will be rounded down to a number of
381 * 1024-byte blocks, and if there were an even number of
382 * reserved blocks. Ideally, all partition checkers should
383 * report the real number of blocks of the real blocksize,
384 * but since this just cannot be done, we have to try to
385 * find the root block anyways. In the above case, it is one
386 * block behind the calculated one. So we check this one, too.
388 for (num_bm = 0; num_bm < 2; num_bm++) {
389 pr_debug("Dev %s, trying root=%u, bs=%d, "
390 "size=%d, reserved=%d\n",
392 sbi->s_root_block + num_bm,
393 blocksize, size, reserved);
394 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
397 if (!affs_checksum_block(sb, root_bh) &&
398 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
399 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
400 sbi->s_hashsize = blocksize / 4 - 56;
401 sbi->s_root_block += num_bm;
404 affs_brelse(root_bh);
409 pr_err("No valid root block on device %s\n", sb->s_id);
412 /* N.B. after this point bh must be released */
414 /* Keep super block in cache */
415 sbi->s_root_bh = root_bh;
416 root_block = sbi->s_root_block;
418 /* Find out which kind of FS we have */
419 boot_bh = sb_bread(sb, 0);
421 pr_err("Cannot read boot block\n");
424 memcpy(sig, boot_bh->b_data, 4);
426 chksum = be32_to_cpu(*(__be32 *)sig);
428 /* Dircache filesystems are compatible with non-dircache ones
429 * when reading. As long as they aren't supported, writing is
432 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
433 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
434 pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
435 sb->s_flags |= MS_RDONLY;
441 affs_set_opt(sbi->s_flags, SF_MUFS);
445 affs_set_opt(sbi->s_flags, SF_INTL);
448 affs_set_opt(sbi->s_flags, SF_MUFS);
453 affs_set_opt(sbi->s_flags, SF_MUFS);
456 affs_set_opt(sbi->s_flags, SF_OFS);
457 sb->s_flags |= MS_NOEXEC;
461 affs_set_opt(sbi->s_flags, SF_MUFS);
464 affs_set_opt(sbi->s_flags, SF_INTL);
465 affs_set_opt(sbi->s_flags, SF_OFS);
466 sb->s_flags |= MS_NOEXEC;
469 pr_err("Unknown filesystem on device %s: %08X\n",
474 if (affs_test_opt(mount_flags, SF_VERBOSE)) {
475 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
476 pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
478 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
479 sig, sig[3] + '0', blocksize);
482 sb->s_flags |= MS_NODEV | MS_NOSUID;
484 sbi->s_data_blksize = sb->s_blocksize;
485 if (affs_test_opt(sbi->s_flags, SF_OFS))
486 sbi->s_data_blksize -= 24;
488 tmp_flags = sb->s_flags;
489 ret = affs_init_bitmap(sb, &tmp_flags);
492 sb->s_flags = tmp_flags;
494 /* set up enough so that it can read an inode */
496 root_inode = affs_iget(sb, root_block);
497 if (IS_ERR(root_inode))
498 return PTR_ERR(root_inode);
500 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
501 sb->s_d_op = &affs_intl_dentry_operations;
503 sb->s_d_op = &affs_dentry_operations;
505 sb->s_root = d_make_root(root_inode);
507 pr_err("AFFS: Get root inode failed\n");
511 sb->s_export_op = &affs_export_ops;
512 pr_debug("s_flags=%lX\n", sb->s_flags);
517 affs_remount(struct super_block *sb, int *flags, char *data)
519 struct affs_sb_info *sbi = AFFS_SB(sb);
526 unsigned long mount_flags;
532 new_opts = kstrdup(data, GFP_KERNEL);
533 if (data && !new_opts)
536 pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
539 *flags |= MS_NODIRATIME;
541 memcpy(volume, sbi->s_volume, 32);
542 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
543 &blocksize, &prefix, volume,
550 flush_delayed_work(&sbi->sb_work);
552 replace_mount_options(sb, new_opts);
554 sbi->s_flags = mount_flags;
558 /* protect against readers */
559 spin_lock(&sbi->symlink_lock);
561 kfree(sbi->s_prefix);
562 sbi->s_prefix = prefix;
564 memcpy(sbi->s_volume, volume, 32);
565 spin_unlock(&sbi->symlink_lock);
567 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
570 if (*flags & MS_RDONLY)
571 affs_free_bitmap(sb);
573 res = affs_init_bitmap(sb, flags);
579 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
581 struct super_block *sb = dentry->d_sb;
583 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
585 pr_debug("%s() partsize=%d, reserved=%d\n",
586 __func__, AFFS_SB(sb)->s_partition_size,
587 AFFS_SB(sb)->s_reserved);
589 free = affs_count_free_blocks(sb);
590 buf->f_type = AFFS_SUPER_MAGIC;
591 buf->f_bsize = sb->s_blocksize;
592 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
594 buf->f_bavail = free;
595 buf->f_fsid.val[0] = (u32)id;
596 buf->f_fsid.val[1] = (u32)(id >> 32);
597 buf->f_namelen = AFFSNAMEMAX;
601 static struct dentry *affs_mount(struct file_system_type *fs_type,
602 int flags, const char *dev_name, void *data)
604 return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
607 static void affs_kill_sb(struct super_block *sb)
609 struct affs_sb_info *sbi = AFFS_SB(sb);
610 kill_block_super(sb);
612 affs_free_bitmap(sb);
613 affs_brelse(sbi->s_root_bh);
614 kfree(sbi->s_prefix);
615 mutex_destroy(&sbi->s_bmlock);
620 static struct file_system_type affs_fs_type = {
621 .owner = THIS_MODULE,
624 .kill_sb = affs_kill_sb,
625 .fs_flags = FS_REQUIRES_DEV,
627 MODULE_ALIAS_FS("affs");
629 static int __init init_affs_fs(void)
631 int err = init_inodecache();
634 err = register_filesystem(&affs_fs_type);
639 destroy_inodecache();
644 static void __exit exit_affs_fs(void)
646 unregister_filesystem(&affs_fs_type);
647 destroy_inodecache();
650 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
651 MODULE_LICENSE("GPL");
653 module_init(init_affs_fs)
654 module_exit(exit_affs_fs)