1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/fs/affs/inode.c
5 * (c) 1996 Hans-Joachim Widmaier - Rewritten
7 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
9 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
11 * (C) 1991 Linus Torvalds - minix filesystem
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/statfs.h>
17 #include <linux/parser.h>
18 #include <linux/magic.h>
19 #include <linux/sched.h>
20 #include <linux/cred.h>
21 #include <linux/slab.h>
22 #include <linux/writeback.h>
23 #include <linux/blkdev.h>
24 #include <linux/seq_file.h>
25 #include <linux/iversion.h>
28 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
29 static int affs_show_options(struct seq_file *m, struct dentry *root);
30 static int affs_remount (struct super_block *sb, int *flags, char *data);
33 affs_commit_super(struct super_block *sb, int wait)
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);
40 affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
41 affs_fix_checksum(sb, bh);
44 mark_buffer_dirty(bh);
46 sync_dirty_buffer(bh);
50 affs_put_super(struct super_block *sb)
52 struct affs_sb_info *sbi = AFFS_SB(sb);
53 pr_debug("%s()\n", __func__);
55 cancel_delayed_work_sync(&sbi->sb_work);
59 affs_sync_fs(struct super_block *sb, int wait)
61 affs_commit_super(sb, wait);
65 static void flush_superblock(struct work_struct *work)
67 struct affs_sb_info *sbi;
68 struct super_block *sb;
70 sbi = container_of(work, struct affs_sb_info, sb_work.work);
73 spin_lock(&sbi->work_lock);
75 spin_unlock(&sbi->work_lock);
77 affs_commit_super(sb, 1);
80 void affs_mark_sb_dirty(struct super_block *sb)
82 struct affs_sb_info *sbi = AFFS_SB(sb);
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);
94 spin_unlock(&sbi->work_lock);
97 static struct kmem_cache * affs_inode_cachep;
99 static struct inode *affs_alloc_inode(struct super_block *sb)
101 struct affs_inode_info *i;
103 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
107 inode_set_iversion(&i->vfs_inode, 1);
112 return &i->vfs_inode;
115 static void affs_free_inode(struct inode *inode)
117 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
120 static void init_once(void *foo)
122 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
124 mutex_init(&ei->i_link_lock);
125 mutex_init(&ei->i_ext_lock);
126 inode_init_once(&ei->vfs_inode);
129 static int __init init_inodecache(void)
131 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
132 sizeof(struct affs_inode_info),
133 0, (SLAB_RECLAIM_ACCOUNT|
134 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
136 if (affs_inode_cachep == NULL)
141 static void destroy_inodecache(void)
144 * Make sure all delayed rcu free inodes are flushed before we
148 kmem_cache_destroy(affs_inode_cachep);
151 static const struct super_operations affs_sops = {
152 .alloc_inode = affs_alloc_inode,
153 .free_inode = affs_free_inode,
154 .write_inode = affs_write_inode,
155 .evict_inode = affs_evict_inode,
156 .put_super = affs_put_super,
157 .sync_fs = affs_sync_fs,
158 .statfs = affs_statfs,
159 .remount_fs = affs_remount,
160 .show_options = affs_show_options,
164 Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
165 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
166 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
169 static const match_table_t tokens = {
171 {Opt_mode, "mode=%o"},
173 {Opt_notruncate, "nofilenametruncate"},
174 {Opt_prefix, "prefix=%s"},
175 {Opt_protect, "protect"},
176 {Opt_reserved, "reserved=%u"},
177 {Opt_root, "root=%u"},
178 {Opt_setgid, "setgid=%u"},
179 {Opt_setuid, "setuid=%u"},
180 {Opt_verbose, "verbose"},
181 {Opt_volume, "volume=%s"},
182 {Opt_ignore, "grpquota"},
183 {Opt_ignore, "noquota"},
184 {Opt_ignore, "quota"},
185 {Opt_ignore, "usrquota"},
190 parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root,
191 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
194 substring_t args[MAX_OPT_ARGS];
196 /* Fill in defaults */
198 *uid = current_uid();
199 *gid = current_gid();
209 while ((p = strsep(&options, ",")) != NULL) {
210 int token, n, option;
214 token = match_token(p, tokens, args);
217 if (match_int(&args[0], &n))
219 if (n != 512 && n != 1024 && n != 2048
221 pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
227 if (match_octal(&args[0], &option))
229 *mode = option & 0777;
230 affs_set_opt(*mount_opts, SF_SETMODE);
233 affs_set_opt(*mount_opts, SF_MUFS);
236 affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
240 *prefix = match_strdup(&args[0]);
243 affs_set_opt(*mount_opts, SF_PREFIX);
246 affs_set_opt(*mount_opts, SF_IMMUTABLE);
249 if (match_int(&args[0], reserved))
253 if (match_int(&args[0], root))
257 if (match_int(&args[0], &option))
259 *gid = make_kgid(current_user_ns(), option);
260 if (!gid_valid(*gid))
262 affs_set_opt(*mount_opts, SF_SETGID);
265 if (match_int(&args[0], &option))
267 *uid = make_kuid(current_user_ns(), option);
268 if (!uid_valid(*uid))
270 affs_set_opt(*mount_opts, SF_SETUID);
273 affs_set_opt(*mount_opts, SF_VERBOSE);
276 char *vol = match_strdup(&args[0]);
279 strlcpy(volume, vol, 32);
284 /* Silently ignore the quota options */
287 pr_warn("Unrecognized mount option \"%s\" or missing value\n",
295 static int affs_show_options(struct seq_file *m, struct dentry *root)
297 struct super_block *sb = root->d_sb;
298 struct affs_sb_info *sbi = AFFS_SB(sb);
301 seq_printf(m, ",bs=%lu", sb->s_blocksize);
302 if (affs_test_opt(sbi->s_flags, SF_SETMODE))
303 seq_printf(m, ",mode=%o", sbi->s_mode);
304 if (affs_test_opt(sbi->s_flags, SF_MUFS))
305 seq_puts(m, ",mufs");
306 if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE))
307 seq_puts(m, ",nofilenametruncate");
308 if (affs_test_opt(sbi->s_flags, SF_PREFIX))
309 seq_printf(m, ",prefix=%s", sbi->s_prefix);
310 if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE))
311 seq_puts(m, ",protect");
312 if (sbi->s_reserved != 2)
313 seq_printf(m, ",reserved=%u", sbi->s_reserved);
314 if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2)
315 seq_printf(m, ",root=%u", sbi->s_root_block);
316 if (affs_test_opt(sbi->s_flags, SF_SETGID))
317 seq_printf(m, ",setgid=%u",
318 from_kgid_munged(&init_user_ns, sbi->s_gid));
319 if (affs_test_opt(sbi->s_flags, SF_SETUID))
320 seq_printf(m, ",setuid=%u",
321 from_kuid_munged(&init_user_ns, sbi->s_uid));
322 if (affs_test_opt(sbi->s_flags, SF_VERBOSE))
323 seq_puts(m, ",verbose");
324 if (sbi->s_volume[0])
325 seq_printf(m, ",volume=%s", sbi->s_volume);
329 /* This function definitely needs to be split up. Some fine day I'll
330 * hopefully have the guts to do so. Until then: sorry for the mess.
333 static int affs_fill_super(struct super_block *sb, void *data, int silent)
335 struct affs_sb_info *sbi;
336 struct buffer_head *root_bh = NULL;
337 struct buffer_head *boot_bh;
338 struct inode *root_inode = NULL;
347 unsigned long mount_flags;
348 int tmp_flags; /* fix remount prototype... */
352 pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
354 sb->s_magic = AFFS_SUPER_MAGIC;
355 sb->s_op = &affs_sops;
356 sb->s_flags |= SB_NODIRATIME;
358 sb->s_time_gran = NSEC_PER_SEC;
359 sb->s_time_min = sys_tz.tz_minuteswest * 60 + AFFS_EPOCH_DELTA;
360 sb->s_time_max = 86400LL * U32_MAX + 86400 + sb->s_time_min;
362 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
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);
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");
379 /* N.B. after this point s_prefix must be released */
381 sbi->s_flags = mount_flags;
385 sbi->s_reserved= reserved;
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.
392 size = i_size_read(sb->s_bdev->bd_inode) >> 9;
393 pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
395 affs_set_blocksize(sb, PAGE_SIZE);
396 /* Try to find root block. Its location depends on the block size. */
398 i = bdev_logical_block_size(sb->s_bdev);
402 size = size / (blocksize / 512);
405 for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
406 sbi->s_root_block = root_block;
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;
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.
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",
427 sbi->s_root_block + num_bm,
428 blocksize, size, reserved);
429 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
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;
439 affs_brelse(root_bh);
444 pr_err("No valid root block on device %s\n", sb->s_id);
447 /* N.B. after this point bh must be released */
449 /* Keep super block in cache */
450 sbi->s_root_bh = root_bh;
451 root_block = sbi->s_root_block;
453 /* Find out which kind of FS we have */
454 boot_bh = sb_bread(sb, 0);
456 pr_err("Cannot read boot block\n");
459 memcpy(sig, boot_bh->b_data, 4);
461 chksum = be32_to_cpu(*(__be32 *)sig);
463 /* Dircache filesystems are compatible with non-dircache ones
464 * when reading. As long as they aren't supported, writing is
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;
476 affs_set_opt(sbi->s_flags, SF_MUFS);
480 affs_set_opt(sbi->s_flags, SF_INTL);
483 affs_set_opt(sbi->s_flags, SF_MUFS);
488 affs_set_opt(sbi->s_flags, SF_MUFS);
491 affs_set_opt(sbi->s_flags, SF_OFS);
492 sb->s_flags |= SB_NOEXEC;
496 affs_set_opt(sbi->s_flags, SF_MUFS);
500 affs_set_opt(sbi->s_flags, SF_INTL);
501 affs_set_opt(sbi->s_flags, SF_OFS);
502 sb->s_flags |= SB_NOEXEC;
505 pr_err("Unknown filesystem on device %s: %08X\n",
510 if (affs_test_opt(mount_flags, SF_VERBOSE)) {
511 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
512 pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
514 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
515 sig, sig[3] + '0', blocksize);
518 sb->s_flags |= SB_NODEV | SB_NOSUID;
520 sbi->s_data_blksize = sb->s_blocksize;
521 if (affs_test_opt(sbi->s_flags, SF_OFS))
522 sbi->s_data_blksize -= 24;
524 tmp_flags = sb->s_flags;
525 ret = affs_init_bitmap(sb, &tmp_flags);
528 sb->s_flags = tmp_flags;
530 /* set up enough so that it can read an inode */
532 root_inode = affs_iget(sb, root_block);
533 if (IS_ERR(root_inode))
534 return PTR_ERR(root_inode);
536 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
537 sb->s_d_op = &affs_intl_dentry_operations;
539 sb->s_d_op = &affs_dentry_operations;
541 sb->s_root = d_make_root(root_inode);
543 pr_err("AFFS: Get root inode failed\n");
547 sb->s_export_op = &affs_export_ops;
548 pr_debug("s_flags=%lX\n", sb->s_flags);
553 affs_remount(struct super_block *sb, int *flags, char *data)
555 struct affs_sb_info *sbi = AFFS_SB(sb);
562 unsigned long mount_flags;
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,
580 flush_delayed_work(&sbi->sb_work);
582 sbi->s_flags = mount_flags;
586 /* protect against readers */
587 spin_lock(&sbi->symlink_lock);
589 kfree(sbi->s_prefix);
590 sbi->s_prefix = prefix;
592 memcpy(sbi->s_volume, volume, 32);
593 spin_unlock(&sbi->symlink_lock);
595 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
598 if (*flags & SB_RDONLY)
599 affs_free_bitmap(sb);
601 res = affs_init_bitmap(sb, flags);
607 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
609 struct super_block *sb = dentry->d_sb;
611 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
613 pr_debug("%s() partsize=%d, reserved=%d\n",
614 __func__, AFFS_SB(sb)->s_partition_size,
615 AFFS_SB(sb)->s_reserved);
617 free = affs_count_free_blocks(sb);
618 buf->f_type = AFFS_SUPER_MAGIC;
619 buf->f_bsize = sb->s_blocksize;
620 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
622 buf->f_bavail = free;
623 buf->f_fsid = u64_to_fsid(id);
624 buf->f_namelen = AFFSNAMEMAX;
628 static struct dentry *affs_mount(struct file_system_type *fs_type,
629 int flags, const char *dev_name, void *data)
631 return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
634 static void affs_kill_sb(struct super_block *sb)
636 struct affs_sb_info *sbi = AFFS_SB(sb);
637 kill_block_super(sb);
639 affs_free_bitmap(sb);
640 affs_brelse(sbi->s_root_bh);
641 kfree(sbi->s_prefix);
642 mutex_destroy(&sbi->s_bmlock);
647 static struct file_system_type affs_fs_type = {
648 .owner = THIS_MODULE,
651 .kill_sb = affs_kill_sb,
652 .fs_flags = FS_REQUIRES_DEV,
654 MODULE_ALIAS_FS("affs");
656 static int __init init_affs_fs(void)
658 int err = init_inodecache();
661 err = register_filesystem(&affs_fs_type);
666 destroy_inodecache();
671 static void __exit exit_affs_fs(void)
673 unregister_filesystem(&affs_fs_type);
674 destroy_inodecache();
677 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
678 MODULE_LICENSE("GPL");
680 module_init(init_affs_fs)
681 module_exit(exit_affs_fs)