1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
6 #include <linux/fs_context.h>
7 #include <linux/fs_parser.h>
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/time.h>
11 #include <linux/mount.h>
12 #include <linux/cred.h>
13 #include <linux/statfs.h>
14 #include <linux/seq_file.h>
15 #include <linux/blkdev.h>
16 #include <linux/fs_struct.h>
17 #include <linux/iversion.h>
18 #include <linux/nls.h>
19 #include <linux/buffer_head.h>
20 #include <linux/magic.h>
22 #include "exfat_raw.h"
25 static char exfat_default_iocharset[] = CONFIG_EXFAT_DEFAULT_IOCHARSET;
26 static struct kmem_cache *exfat_inode_cachep;
28 static void exfat_free_iocharset(struct exfat_sb_info *sbi)
30 if (sbi->options.iocharset != exfat_default_iocharset)
31 kfree(sbi->options.iocharset);
34 static void exfat_delayed_free(struct rcu_head *p)
36 struct exfat_sb_info *sbi = container_of(p, struct exfat_sb_info, rcu);
38 unload_nls(sbi->nls_io);
39 exfat_free_iocharset(sbi);
40 exfat_free_upcase_table(sbi);
44 static void exfat_put_super(struct super_block *sb)
46 struct exfat_sb_info *sbi = EXFAT_SB(sb);
48 mutex_lock(&sbi->s_lock);
49 exfat_free_bitmap(sbi);
51 mutex_unlock(&sbi->s_lock);
53 call_rcu(&sbi->rcu, exfat_delayed_free);
56 static int exfat_sync_fs(struct super_block *sb, int wait)
58 struct exfat_sb_info *sbi = EXFAT_SB(sb);
64 /* If there are some dirty buffers in the bdev inode */
65 mutex_lock(&sbi->s_lock);
66 sync_blockdev(sb->s_bdev);
67 if (exfat_clear_volume_dirty(sb))
69 mutex_unlock(&sbi->s_lock);
73 static int exfat_statfs(struct dentry *dentry, struct kstatfs *buf)
75 struct super_block *sb = dentry->d_sb;
76 struct exfat_sb_info *sbi = EXFAT_SB(sb);
77 unsigned long long id = huge_encode_dev(sb->s_bdev->bd_dev);
79 if (sbi->used_clusters == EXFAT_CLUSTERS_UNTRACKED) {
80 mutex_lock(&sbi->s_lock);
81 if (exfat_count_used_clusters(sb, &sbi->used_clusters)) {
82 mutex_unlock(&sbi->s_lock);
85 mutex_unlock(&sbi->s_lock);
88 buf->f_type = sb->s_magic;
89 buf->f_bsize = sbi->cluster_size;
90 buf->f_blocks = sbi->num_clusters - 2; /* clu 0 & 1 */
91 buf->f_bfree = buf->f_blocks - sbi->used_clusters;
92 buf->f_bavail = buf->f_bfree;
93 buf->f_fsid = u64_to_fsid(id);
94 /* Unicode utf16 255 characters */
95 buf->f_namelen = EXFAT_MAX_FILE_LEN * NLS_MAX_CHARSET_SIZE;
99 static int exfat_set_vol_flags(struct super_block *sb, unsigned short new_flags)
101 struct exfat_sb_info *sbi = EXFAT_SB(sb);
102 struct boot_sector *p_boot = (struct boot_sector *)sbi->boot_bh->b_data;
105 /* retain persistent-flags */
106 new_flags |= sbi->vol_flags_persistent;
108 /* flags are not changed */
109 if (sbi->vol_flags == new_flags)
112 sbi->vol_flags = new_flags;
114 /* skip updating volume dirty flag,
115 * if this volume has been mounted with read-only
120 p_boot->vol_flags = cpu_to_le16(new_flags);
122 if ((new_flags & VOLUME_DIRTY) && !buffer_dirty(sbi->boot_bh))
127 set_buffer_uptodate(sbi->boot_bh);
128 mark_buffer_dirty(sbi->boot_bh);
131 sync_dirty_buffer(sbi->boot_bh);
135 int exfat_set_volume_dirty(struct super_block *sb)
137 struct exfat_sb_info *sbi = EXFAT_SB(sb);
139 return exfat_set_vol_flags(sb, sbi->vol_flags | VOLUME_DIRTY);
142 int exfat_clear_volume_dirty(struct super_block *sb)
144 struct exfat_sb_info *sbi = EXFAT_SB(sb);
146 return exfat_set_vol_flags(sb, sbi->vol_flags & ~VOLUME_DIRTY);
149 static int exfat_show_options(struct seq_file *m, struct dentry *root)
151 struct super_block *sb = root->d_sb;
152 struct exfat_sb_info *sbi = EXFAT_SB(sb);
153 struct exfat_mount_options *opts = &sbi->options;
155 /* Show partition info */
156 if (!uid_eq(opts->fs_uid, GLOBAL_ROOT_UID))
157 seq_printf(m, ",uid=%u",
158 from_kuid_munged(&init_user_ns, opts->fs_uid));
159 if (!gid_eq(opts->fs_gid, GLOBAL_ROOT_GID))
160 seq_printf(m, ",gid=%u",
161 from_kgid_munged(&init_user_ns, opts->fs_gid));
162 seq_printf(m, ",fmask=%04o,dmask=%04o", opts->fs_fmask, opts->fs_dmask);
163 if (opts->allow_utime)
164 seq_printf(m, ",allow_utime=%04o", opts->allow_utime);
166 seq_puts(m, ",iocharset=utf8");
167 else if (sbi->nls_io)
168 seq_printf(m, ",iocharset=%s", sbi->nls_io->charset);
169 if (opts->errors == EXFAT_ERRORS_CONT)
170 seq_puts(m, ",errors=continue");
171 else if (opts->errors == EXFAT_ERRORS_PANIC)
172 seq_puts(m, ",errors=panic");
174 seq_puts(m, ",errors=remount-ro");
176 seq_puts(m, ",discard");
177 if (opts->time_offset)
178 seq_printf(m, ",time_offset=%d", opts->time_offset);
182 static struct inode *exfat_alloc_inode(struct super_block *sb)
184 struct exfat_inode_info *ei;
186 ei = kmem_cache_alloc(exfat_inode_cachep, GFP_NOFS);
190 init_rwsem(&ei->truncate_lock);
191 return &ei->vfs_inode;
194 static void exfat_free_inode(struct inode *inode)
196 kmem_cache_free(exfat_inode_cachep, EXFAT_I(inode));
199 static const struct super_operations exfat_sops = {
200 .alloc_inode = exfat_alloc_inode,
201 .free_inode = exfat_free_inode,
202 .write_inode = exfat_write_inode,
203 .evict_inode = exfat_evict_inode,
204 .put_super = exfat_put_super,
205 .sync_fs = exfat_sync_fs,
206 .statfs = exfat_statfs,
207 .show_options = exfat_show_options,
222 /* Deprecated options */
229 static const struct constant_table exfat_param_enums[] = {
230 { "continue", EXFAT_ERRORS_CONT },
231 { "panic", EXFAT_ERRORS_PANIC },
232 { "remount-ro", EXFAT_ERRORS_RO },
236 static const struct fs_parameter_spec exfat_parameters[] = {
237 fsparam_u32("uid", Opt_uid),
238 fsparam_u32("gid", Opt_gid),
239 fsparam_u32oct("umask", Opt_umask),
240 fsparam_u32oct("dmask", Opt_dmask),
241 fsparam_u32oct("fmask", Opt_fmask),
242 fsparam_u32oct("allow_utime", Opt_allow_utime),
243 fsparam_string("iocharset", Opt_charset),
244 fsparam_enum("errors", Opt_errors, exfat_param_enums),
245 fsparam_flag("discard", Opt_discard),
246 fsparam_s32("time_offset", Opt_time_offset),
247 __fsparam(NULL, "utf8", Opt_utf8, fs_param_deprecated,
249 __fsparam(NULL, "debug", Opt_debug, fs_param_deprecated,
251 __fsparam(fs_param_is_u32, "namecase", Opt_namecase,
252 fs_param_deprecated, NULL),
253 __fsparam(fs_param_is_u32, "codepage", Opt_codepage,
254 fs_param_deprecated, NULL),
258 static int exfat_parse_param(struct fs_context *fc, struct fs_parameter *param)
260 struct exfat_sb_info *sbi = fc->s_fs_info;
261 struct exfat_mount_options *opts = &sbi->options;
262 struct fs_parse_result result;
265 opt = fs_parse(fc, exfat_parameters, param, &result);
271 opts->fs_uid = make_kuid(current_user_ns(), result.uint_32);
274 opts->fs_gid = make_kgid(current_user_ns(), result.uint_32);
277 opts->fs_fmask = result.uint_32;
278 opts->fs_dmask = result.uint_32;
281 opts->fs_dmask = result.uint_32;
284 opts->fs_fmask = result.uint_32;
286 case Opt_allow_utime:
287 opts->allow_utime = result.uint_32 & 0022;
290 exfat_free_iocharset(sbi);
291 opts->iocharset = param->string;
292 param->string = NULL;
295 opts->errors = result.uint_32;
300 case Opt_time_offset:
302 * Make the limit 24 just in case someone invents something
305 if (result.int_32 < -24 * 60 || result.int_32 > 24 * 60)
307 opts->time_offset = result.int_32;
321 static void exfat_hash_init(struct super_block *sb)
323 struct exfat_sb_info *sbi = EXFAT_SB(sb);
326 spin_lock_init(&sbi->inode_hash_lock);
327 for (i = 0; i < EXFAT_HASH_SIZE; i++)
328 INIT_HLIST_HEAD(&sbi->inode_hashtable[i]);
331 static int exfat_read_root(struct inode *inode)
333 struct super_block *sb = inode->i_sb;
334 struct exfat_sb_info *sbi = EXFAT_SB(sb);
335 struct exfat_inode_info *ei = EXFAT_I(inode);
336 struct exfat_chain cdir;
337 int num_subdirs, num_clu = 0;
339 exfat_chain_set(&ei->dir, sbi->root_dir, 0, ALLOC_FAT_CHAIN);
341 ei->start_clu = sbi->root_dir;
342 ei->flags = ALLOC_FAT_CHAIN;
345 ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
346 ei->hint_stat.eidx = 0;
347 ei->hint_stat.clu = sbi->root_dir;
348 ei->hint_femp.eidx = EXFAT_HINT_NONE;
350 exfat_chain_set(&cdir, sbi->root_dir, 0, ALLOC_FAT_CHAIN);
351 if (exfat_count_num_clusters(sb, &cdir, &num_clu))
353 i_size_write(inode, num_clu << sbi->cluster_size_bits);
355 num_subdirs = exfat_count_dir_entries(sb, &cdir);
358 set_nlink(inode, num_subdirs + EXFAT_MIN_SUBDIR);
360 inode->i_uid = sbi->options.fs_uid;
361 inode->i_gid = sbi->options.fs_gid;
362 inode_inc_iversion(inode);
363 inode->i_generation = 0;
364 inode->i_mode = exfat_make_mode(sbi, ATTR_SUBDIR, 0777);
365 inode->i_op = &exfat_dir_inode_operations;
366 inode->i_fop = &exfat_dir_operations;
368 inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >>
370 ei->i_pos = ((loff_t)sbi->root_dir << 32) | 0xffffffff;
371 ei->i_size_aligned = i_size_read(inode);
372 ei->i_size_ondisk = i_size_read(inode);
374 exfat_save_attr(inode, ATTR_SUBDIR);
375 inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime =
377 exfat_truncate_atime(&inode->i_atime);
381 static int exfat_calibrate_blocksize(struct super_block *sb, int logical_sect)
383 struct exfat_sb_info *sbi = EXFAT_SB(sb);
385 if (!is_power_of_2(logical_sect)) {
386 exfat_err(sb, "bogus logical sector size %u", logical_sect);
390 if (logical_sect < sb->s_blocksize) {
391 exfat_err(sb, "logical sector size too small for device (logical sector size = %u)",
396 if (logical_sect > sb->s_blocksize) {
397 brelse(sbi->boot_bh);
400 if (!sb_set_blocksize(sb, logical_sect)) {
401 exfat_err(sb, "unable to set blocksize %u",
405 sbi->boot_bh = sb_bread(sb, 0);
407 exfat_err(sb, "unable to read boot sector (logical sector size = %lu)",
415 static int exfat_read_boot_sector(struct super_block *sb)
417 struct boot_sector *p_boot;
418 struct exfat_sb_info *sbi = EXFAT_SB(sb);
420 /* set block size to read super block */
421 sb_min_blocksize(sb, 512);
423 /* read boot sector */
424 sbi->boot_bh = sb_bread(sb, 0);
426 exfat_err(sb, "unable to read boot sector");
429 p_boot = (struct boot_sector *)sbi->boot_bh->b_data;
431 /* check the validity of BOOT */
432 if (le16_to_cpu((p_boot->signature)) != BOOT_SIGNATURE) {
433 exfat_err(sb, "invalid boot record signature");
437 if (memcmp(p_boot->fs_name, STR_EXFAT, BOOTSEC_FS_NAME_LEN)) {
438 exfat_err(sb, "invalid fs_name"); /* fs_name may unprintable */
443 * must_be_zero field must be filled with zero to prevent mounting
446 if (memchr_inv(p_boot->must_be_zero, 0, sizeof(p_boot->must_be_zero)))
449 if (p_boot->num_fats != 1 && p_boot->num_fats != 2) {
450 exfat_err(sb, "bogus number of FAT structure");
455 * sect_size_bits could be at least 9 and at most 12.
457 if (p_boot->sect_size_bits < EXFAT_MIN_SECT_SIZE_BITS ||
458 p_boot->sect_size_bits > EXFAT_MAX_SECT_SIZE_BITS) {
459 exfat_err(sb, "bogus sector size bits : %u\n",
460 p_boot->sect_size_bits);
465 * sect_per_clus_bits could be at least 0 and at most 25 - sect_size_bits.
467 if (p_boot->sect_per_clus_bits > EXFAT_MAX_SECT_PER_CLUS_BITS(p_boot)) {
468 exfat_err(sb, "bogus sectors bits per cluster : %u\n",
469 p_boot->sect_per_clus_bits);
473 sbi->sect_per_clus = 1 << p_boot->sect_per_clus_bits;
474 sbi->sect_per_clus_bits = p_boot->sect_per_clus_bits;
475 sbi->cluster_size_bits = p_boot->sect_per_clus_bits +
476 p_boot->sect_size_bits;
477 sbi->cluster_size = 1 << sbi->cluster_size_bits;
478 sbi->num_FAT_sectors = le32_to_cpu(p_boot->fat_length);
479 sbi->FAT1_start_sector = le32_to_cpu(p_boot->fat_offset);
480 sbi->FAT2_start_sector = le32_to_cpu(p_boot->fat_offset);
481 if (p_boot->num_fats == 2)
482 sbi->FAT2_start_sector += sbi->num_FAT_sectors;
483 sbi->data_start_sector = le32_to_cpu(p_boot->clu_offset);
484 sbi->num_sectors = le64_to_cpu(p_boot->vol_length);
485 /* because the cluster index starts with 2 */
486 sbi->num_clusters = le32_to_cpu(p_boot->clu_count) +
487 EXFAT_RESERVED_CLUSTERS;
489 sbi->root_dir = le32_to_cpu(p_boot->root_cluster);
490 sbi->dentries_per_clu = 1 <<
491 (sbi->cluster_size_bits - DENTRY_SIZE_BITS);
493 sbi->vol_flags = le16_to_cpu(p_boot->vol_flags);
494 sbi->vol_flags_persistent = sbi->vol_flags & (VOLUME_DIRTY | MEDIA_FAILURE);
495 sbi->clu_srch_ptr = EXFAT_FIRST_CLUSTER;
496 sbi->used_clusters = EXFAT_CLUSTERS_UNTRACKED;
498 /* check consistencies */
499 if ((u64)sbi->num_FAT_sectors << p_boot->sect_size_bits <
500 (u64)sbi->num_clusters * 4) {
501 exfat_err(sb, "bogus fat length");
505 if (sbi->data_start_sector <
506 (u64)sbi->FAT1_start_sector +
507 (u64)sbi->num_FAT_sectors * p_boot->num_fats) {
508 exfat_err(sb, "bogus data start sector");
512 if (sbi->vol_flags & VOLUME_DIRTY)
513 exfat_warn(sb, "Volume was not properly unmounted. Some data may be corrupt. Please run fsck.");
514 if (sbi->vol_flags & MEDIA_FAILURE)
515 exfat_warn(sb, "Medium has reported failures. Some data may be lost.");
517 /* exFAT file size is limited by a disk volume size */
518 sb->s_maxbytes = (u64)(sbi->num_clusters - EXFAT_RESERVED_CLUSTERS) <<
519 sbi->cluster_size_bits;
521 /* check logical sector size */
522 if (exfat_calibrate_blocksize(sb, 1 << p_boot->sect_size_bits))
528 static int exfat_verify_boot_region(struct super_block *sb)
530 struct buffer_head *bh = NULL;
532 __le32 *p_sig, *p_chksum;
535 /* read boot sector sub-regions */
536 for (sn = 0; sn < 11; sn++) {
537 bh = sb_bread(sb, sn);
541 if (sn != 0 && sn <= 8) {
542 /* extended boot sector sub-regions */
543 p_sig = (__le32 *)&bh->b_data[sb->s_blocksize - 4];
544 if (le32_to_cpu(*p_sig) != EXBOOT_SIGNATURE)
545 exfat_warn(sb, "Invalid exboot-signature(sector = %d): 0x%08x",
546 sn, le32_to_cpu(*p_sig));
549 chksum = exfat_calc_chksum32(bh->b_data, sb->s_blocksize,
550 chksum, sn ? CS_DEFAULT : CS_BOOT_SECTOR);
554 /* boot checksum sub-regions */
555 bh = sb_bread(sb, sn);
559 for (i = 0; i < sb->s_blocksize; i += sizeof(u32)) {
560 p_chksum = (__le32 *)&bh->b_data[i];
561 if (le32_to_cpu(*p_chksum) != chksum) {
562 exfat_err(sb, "Invalid boot checksum (boot checksum : 0x%08x, checksum : 0x%08x)",
563 le32_to_cpu(*p_chksum), chksum);
572 /* mount the file system volume */
573 static int __exfat_fill_super(struct super_block *sb)
576 struct exfat_sb_info *sbi = EXFAT_SB(sb);
578 ret = exfat_read_boot_sector(sb);
580 exfat_err(sb, "failed to read boot sector");
584 ret = exfat_verify_boot_region(sb);
586 exfat_err(sb, "invalid boot region");
590 ret = exfat_create_upcase_table(sb);
592 exfat_err(sb, "failed to load upcase table");
596 ret = exfat_load_bitmap(sb);
598 exfat_err(sb, "failed to load alloc-bitmap");
599 goto free_upcase_table;
602 ret = exfat_count_used_clusters(sb, &sbi->used_clusters);
604 exfat_err(sb, "failed to scan clusters");
605 goto free_alloc_bitmap;
611 exfat_free_bitmap(sbi);
613 exfat_free_upcase_table(sbi);
615 brelse(sbi->boot_bh);
619 static int exfat_fill_super(struct super_block *sb, struct fs_context *fc)
621 struct exfat_sb_info *sbi = sb->s_fs_info;
622 struct exfat_mount_options *opts = &sbi->options;
623 struct inode *root_inode;
626 if (opts->allow_utime == (unsigned short)-1)
627 opts->allow_utime = ~opts->fs_dmask & 0022;
630 struct request_queue *q = bdev_get_queue(sb->s_bdev);
632 if (!blk_queue_discard(q)) {
633 exfat_warn(sb, "mounting with \"discard\" option, but the device does not support discard");
638 sb->s_flags |= SB_NODIRATIME;
639 sb->s_magic = EXFAT_SUPER_MAGIC;
640 sb->s_op = &exfat_sops;
642 sb->s_time_gran = 10 * NSEC_PER_MSEC;
643 sb->s_time_min = EXFAT_MIN_TIMESTAMP_SECS;
644 sb->s_time_max = EXFAT_MAX_TIMESTAMP_SECS;
646 err = __exfat_fill_super(sb);
648 exfat_err(sb, "failed to recognize exfat type");
652 /* set up enough so that it can read an inode */
655 if (!strcmp(sbi->options.iocharset, "utf8"))
658 sbi->nls_io = load_nls(sbi->options.iocharset);
660 exfat_err(sb, "IO charset %s not found",
661 sbi->options.iocharset);
667 if (sbi->options.utf8)
668 sb->s_d_op = &exfat_utf8_dentry_ops;
670 sb->s_d_op = &exfat_dentry_ops;
672 root_inode = new_inode(sb);
674 exfat_err(sb, "failed to allocate root inode");
679 root_inode->i_ino = EXFAT_ROOT_INO;
680 inode_set_iversion(root_inode, 1);
681 err = exfat_read_root(root_inode);
683 exfat_err(sb, "failed to initialize root inode");
687 exfat_hash_inode(root_inode, EXFAT_I(root_inode)->i_pos);
688 insert_inode_hash(root_inode);
690 sb->s_root = d_make_root(root_inode);
692 exfat_err(sb, "failed to get the root dentry");
704 exfat_free_upcase_table(sbi);
705 exfat_free_bitmap(sbi);
706 brelse(sbi->boot_bh);
709 unload_nls(sbi->nls_io);
710 exfat_free_iocharset(sbi);
711 sb->s_fs_info = NULL;
716 static int exfat_get_tree(struct fs_context *fc)
718 return get_tree_bdev(fc, exfat_fill_super);
721 static void exfat_free(struct fs_context *fc)
723 struct exfat_sb_info *sbi = fc->s_fs_info;
726 exfat_free_iocharset(sbi);
731 static int exfat_reconfigure(struct fs_context *fc)
733 fc->sb_flags |= SB_NODIRATIME;
735 /* volume flag will be updated in exfat_sync_fs */
736 sync_filesystem(fc->root->d_sb);
740 static const struct fs_context_operations exfat_context_ops = {
741 .parse_param = exfat_parse_param,
742 .get_tree = exfat_get_tree,
744 .reconfigure = exfat_reconfigure,
747 static int exfat_init_fs_context(struct fs_context *fc)
749 struct exfat_sb_info *sbi;
751 sbi = kzalloc(sizeof(struct exfat_sb_info), GFP_KERNEL);
755 mutex_init(&sbi->s_lock);
756 mutex_init(&sbi->bitmap_lock);
757 ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL,
758 DEFAULT_RATELIMIT_BURST);
760 sbi->options.fs_uid = current_uid();
761 sbi->options.fs_gid = current_gid();
762 sbi->options.fs_fmask = current->fs->umask;
763 sbi->options.fs_dmask = current->fs->umask;
764 sbi->options.allow_utime = -1;
765 sbi->options.iocharset = exfat_default_iocharset;
766 sbi->options.errors = EXFAT_ERRORS_RO;
769 fc->ops = &exfat_context_ops;
773 static struct file_system_type exfat_fs_type = {
774 .owner = THIS_MODULE,
776 .init_fs_context = exfat_init_fs_context,
777 .parameters = exfat_parameters,
778 .kill_sb = kill_block_super,
779 .fs_flags = FS_REQUIRES_DEV,
782 static void exfat_inode_init_once(void *foo)
784 struct exfat_inode_info *ei = (struct exfat_inode_info *)foo;
786 spin_lock_init(&ei->cache_lru_lock);
788 ei->cache_valid_id = EXFAT_CACHE_VALID + 1;
789 INIT_LIST_HEAD(&ei->cache_lru);
790 INIT_HLIST_NODE(&ei->i_hash_fat);
791 inode_init_once(&ei->vfs_inode);
794 static int __init init_exfat_fs(void)
798 err = exfat_cache_init();
802 exfat_inode_cachep = kmem_cache_create("exfat_inode_cache",
803 sizeof(struct exfat_inode_info),
804 0, SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
805 exfat_inode_init_once);
806 if (!exfat_inode_cachep) {
811 err = register_filesystem(&exfat_fs_type);
818 kmem_cache_destroy(exfat_inode_cachep);
820 exfat_cache_shutdown();
824 static void __exit exit_exfat_fs(void)
827 * Make sure all delayed rcu free inodes are flushed before we
831 kmem_cache_destroy(exfat_inode_cachep);
832 unregister_filesystem(&exfat_fs_type);
833 exfat_cache_shutdown();
836 module_init(init_exfat_fs);
837 module_exit(exit_exfat_fs);
839 MODULE_ALIAS_FS("exfat");
840 MODULE_LICENSE("GPL");
841 MODULE_DESCRIPTION("exFAT filesystem support");
842 MODULE_AUTHOR("Samsung Electronics Co., Ltd.");