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846 lines
21 KiB
846 lines
21 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. |
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*/ |
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|
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#include <linux/fs_context.h> |
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#include <linux/fs_parser.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/time.h> |
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#include <linux/mount.h> |
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#include <linux/cred.h> |
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#include <linux/statfs.h> |
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#include <linux/seq_file.h> |
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#include <linux/blkdev.h> |
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#include <linux/fs_struct.h> |
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#include <linux/iversion.h> |
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#include <linux/nls.h> |
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#include <linux/buffer_head.h> |
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#include <linux/magic.h> |
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#include "exfat_raw.h" |
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#include "exfat_fs.h" |
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static char exfat_default_iocharset[] = CONFIG_EXFAT_DEFAULT_IOCHARSET; |
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static struct kmem_cache *exfat_inode_cachep; |
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static void exfat_free_iocharset(struct exfat_sb_info *sbi) |
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{ |
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if (sbi->options.iocharset != exfat_default_iocharset) |
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kfree(sbi->options.iocharset); |
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} |
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static void exfat_delayed_free(struct rcu_head *p) |
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{ |
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struct exfat_sb_info *sbi = container_of(p, struct exfat_sb_info, rcu); |
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unload_nls(sbi->nls_io); |
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exfat_free_iocharset(sbi); |
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exfat_free_upcase_table(sbi); |
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kfree(sbi); |
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} |
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static void exfat_put_super(struct super_block *sb) |
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{ |
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struct exfat_sb_info *sbi = EXFAT_SB(sb); |
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mutex_lock(&sbi->s_lock); |
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exfat_free_bitmap(sbi); |
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brelse(sbi->boot_bh); |
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mutex_unlock(&sbi->s_lock); |
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call_rcu(&sbi->rcu, exfat_delayed_free); |
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} |
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static int exfat_sync_fs(struct super_block *sb, int wait) |
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{ |
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struct exfat_sb_info *sbi = EXFAT_SB(sb); |
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int err = 0; |
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if (!wait) |
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return 0; |
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/* If there are some dirty buffers in the bdev inode */ |
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mutex_lock(&sbi->s_lock); |
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sync_blockdev(sb->s_bdev); |
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if (exfat_clear_volume_dirty(sb)) |
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err = -EIO; |
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mutex_unlock(&sbi->s_lock); |
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return err; |
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} |
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static int exfat_statfs(struct dentry *dentry, struct kstatfs *buf) |
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{ |
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struct super_block *sb = dentry->d_sb; |
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struct exfat_sb_info *sbi = EXFAT_SB(sb); |
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unsigned long long id = huge_encode_dev(sb->s_bdev->bd_dev); |
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if (sbi->used_clusters == EXFAT_CLUSTERS_UNTRACKED) { |
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mutex_lock(&sbi->s_lock); |
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if (exfat_count_used_clusters(sb, &sbi->used_clusters)) { |
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mutex_unlock(&sbi->s_lock); |
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return -EIO; |
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} |
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mutex_unlock(&sbi->s_lock); |
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} |
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buf->f_type = sb->s_magic; |
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buf->f_bsize = sbi->cluster_size; |
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buf->f_blocks = sbi->num_clusters - 2; /* clu 0 & 1 */ |
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buf->f_bfree = buf->f_blocks - sbi->used_clusters; |
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buf->f_bavail = buf->f_bfree; |
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buf->f_fsid = u64_to_fsid(id); |
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/* Unicode utf16 255 characters */ |
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buf->f_namelen = EXFAT_MAX_FILE_LEN * NLS_MAX_CHARSET_SIZE; |
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return 0; |
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} |
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static int exfat_set_vol_flags(struct super_block *sb, unsigned short new_flags) |
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{ |
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struct exfat_sb_info *sbi = EXFAT_SB(sb); |
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struct boot_sector *p_boot = (struct boot_sector *)sbi->boot_bh->b_data; |
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/* retain persistent-flags */ |
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new_flags |= sbi->vol_flags_persistent; |
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/* flags are not changed */ |
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if (sbi->vol_flags == new_flags) |
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return 0; |
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sbi->vol_flags = new_flags; |
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/* skip updating volume dirty flag, |
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* if this volume has been mounted with read-only |
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*/ |
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if (sb_rdonly(sb)) |
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return 0; |
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p_boot->vol_flags = cpu_to_le16(new_flags); |
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set_buffer_uptodate(sbi->boot_bh); |
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mark_buffer_dirty(sbi->boot_bh); |
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__sync_dirty_buffer(sbi->boot_bh, REQ_SYNC | REQ_FUA | REQ_PREFLUSH); |
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return 0; |
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} |
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int exfat_set_volume_dirty(struct super_block *sb) |
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{ |
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struct exfat_sb_info *sbi = EXFAT_SB(sb); |
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return exfat_set_vol_flags(sb, sbi->vol_flags | VOLUME_DIRTY); |
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} |
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int exfat_clear_volume_dirty(struct super_block *sb) |
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{ |
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struct exfat_sb_info *sbi = EXFAT_SB(sb); |
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return exfat_set_vol_flags(sb, sbi->vol_flags & ~VOLUME_DIRTY); |
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} |
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static int exfat_show_options(struct seq_file *m, struct dentry *root) |
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{ |
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struct super_block *sb = root->d_sb; |
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struct exfat_sb_info *sbi = EXFAT_SB(sb); |
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struct exfat_mount_options *opts = &sbi->options; |
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/* Show partition info */ |
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if (!uid_eq(opts->fs_uid, GLOBAL_ROOT_UID)) |
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seq_printf(m, ",uid=%u", |
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from_kuid_munged(&init_user_ns, opts->fs_uid)); |
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if (!gid_eq(opts->fs_gid, GLOBAL_ROOT_GID)) |
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seq_printf(m, ",gid=%u", |
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from_kgid_munged(&init_user_ns, opts->fs_gid)); |
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seq_printf(m, ",fmask=%04o,dmask=%04o", opts->fs_fmask, opts->fs_dmask); |
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if (opts->allow_utime) |
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seq_printf(m, ",allow_utime=%04o", opts->allow_utime); |
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if (opts->utf8) |
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seq_puts(m, ",iocharset=utf8"); |
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else if (sbi->nls_io) |
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seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); |
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if (opts->errors == EXFAT_ERRORS_CONT) |
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seq_puts(m, ",errors=continue"); |
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else if (opts->errors == EXFAT_ERRORS_PANIC) |
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seq_puts(m, ",errors=panic"); |
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else |
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seq_puts(m, ",errors=remount-ro"); |
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if (opts->discard) |
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seq_puts(m, ",discard"); |
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if (opts->keep_last_dots) |
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seq_puts(m, ",keep_last_dots"); |
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if (opts->sys_tz) |
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seq_puts(m, ",sys_tz"); |
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else if (opts->time_offset) |
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seq_printf(m, ",time_offset=%d", opts->time_offset); |
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return 0; |
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} |
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static struct inode *exfat_alloc_inode(struct super_block *sb) |
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{ |
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struct exfat_inode_info *ei; |
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ei = alloc_inode_sb(sb, exfat_inode_cachep, GFP_NOFS); |
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if (!ei) |
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return NULL; |
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init_rwsem(&ei->truncate_lock); |
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return &ei->vfs_inode; |
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} |
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static void exfat_free_inode(struct inode *inode) |
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{ |
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kmem_cache_free(exfat_inode_cachep, EXFAT_I(inode)); |
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} |
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static const struct super_operations exfat_sops = { |
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.alloc_inode = exfat_alloc_inode, |
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.free_inode = exfat_free_inode, |
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.write_inode = exfat_write_inode, |
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.evict_inode = exfat_evict_inode, |
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.put_super = exfat_put_super, |
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.sync_fs = exfat_sync_fs, |
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.statfs = exfat_statfs, |
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.show_options = exfat_show_options, |
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}; |
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enum { |
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Opt_uid, |
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Opt_gid, |
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Opt_umask, |
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Opt_dmask, |
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Opt_fmask, |
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Opt_allow_utime, |
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Opt_charset, |
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Opt_errors, |
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Opt_discard, |
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Opt_keep_last_dots, |
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Opt_sys_tz, |
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Opt_time_offset, |
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/* Deprecated options */ |
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Opt_utf8, |
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Opt_debug, |
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Opt_namecase, |
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Opt_codepage, |
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}; |
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static const struct constant_table exfat_param_enums[] = { |
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{ "continue", EXFAT_ERRORS_CONT }, |
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{ "panic", EXFAT_ERRORS_PANIC }, |
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{ "remount-ro", EXFAT_ERRORS_RO }, |
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{} |
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}; |
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static const struct fs_parameter_spec exfat_parameters[] = { |
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fsparam_u32("uid", Opt_uid), |
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fsparam_u32("gid", Opt_gid), |
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fsparam_u32oct("umask", Opt_umask), |
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fsparam_u32oct("dmask", Opt_dmask), |
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fsparam_u32oct("fmask", Opt_fmask), |
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fsparam_u32oct("allow_utime", Opt_allow_utime), |
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fsparam_string("iocharset", Opt_charset), |
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fsparam_enum("errors", Opt_errors, exfat_param_enums), |
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fsparam_flag("discard", Opt_discard), |
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fsparam_flag("keep_last_dots", Opt_keep_last_dots), |
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fsparam_flag("sys_tz", Opt_sys_tz), |
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fsparam_s32("time_offset", Opt_time_offset), |
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__fsparam(NULL, "utf8", Opt_utf8, fs_param_deprecated, |
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NULL), |
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__fsparam(NULL, "debug", Opt_debug, fs_param_deprecated, |
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NULL), |
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__fsparam(fs_param_is_u32, "namecase", Opt_namecase, |
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fs_param_deprecated, NULL), |
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__fsparam(fs_param_is_u32, "codepage", Opt_codepage, |
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fs_param_deprecated, NULL), |
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{} |
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}; |
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static int exfat_parse_param(struct fs_context *fc, struct fs_parameter *param) |
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{ |
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struct exfat_sb_info *sbi = fc->s_fs_info; |
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struct exfat_mount_options *opts = &sbi->options; |
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struct fs_parse_result result; |
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int opt; |
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opt = fs_parse(fc, exfat_parameters, param, &result); |
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if (opt < 0) |
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return opt; |
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switch (opt) { |
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case Opt_uid: |
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opts->fs_uid = make_kuid(current_user_ns(), result.uint_32); |
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break; |
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case Opt_gid: |
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opts->fs_gid = make_kgid(current_user_ns(), result.uint_32); |
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break; |
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case Opt_umask: |
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opts->fs_fmask = result.uint_32; |
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opts->fs_dmask = result.uint_32; |
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break; |
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case Opt_dmask: |
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opts->fs_dmask = result.uint_32; |
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break; |
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case Opt_fmask: |
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opts->fs_fmask = result.uint_32; |
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break; |
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case Opt_allow_utime: |
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opts->allow_utime = result.uint_32 & 0022; |
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break; |
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case Opt_charset: |
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exfat_free_iocharset(sbi); |
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opts->iocharset = param->string; |
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param->string = NULL; |
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break; |
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case Opt_errors: |
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opts->errors = result.uint_32; |
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break; |
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case Opt_discard: |
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opts->discard = 1; |
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break; |
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case Opt_keep_last_dots: |
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opts->keep_last_dots = 1; |
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break; |
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case Opt_sys_tz: |
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opts->sys_tz = 1; |
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break; |
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case Opt_time_offset: |
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/* |
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* Make the limit 24 just in case someone invents something |
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* unusual. |
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*/ |
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if (result.int_32 < -24 * 60 || result.int_32 > 24 * 60) |
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return -EINVAL; |
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opts->time_offset = result.int_32; |
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break; |
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case Opt_utf8: |
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case Opt_debug: |
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case Opt_namecase: |
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case Opt_codepage: |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static void exfat_hash_init(struct super_block *sb) |
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{ |
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struct exfat_sb_info *sbi = EXFAT_SB(sb); |
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int i; |
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spin_lock_init(&sbi->inode_hash_lock); |
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for (i = 0; i < EXFAT_HASH_SIZE; i++) |
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INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); |
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} |
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static int exfat_read_root(struct inode *inode) |
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{ |
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struct super_block *sb = inode->i_sb; |
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struct exfat_sb_info *sbi = EXFAT_SB(sb); |
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struct exfat_inode_info *ei = EXFAT_I(inode); |
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struct exfat_chain cdir; |
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int num_subdirs, num_clu = 0; |
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exfat_chain_set(&ei->dir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); |
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ei->entry = -1; |
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ei->start_clu = sbi->root_dir; |
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ei->flags = ALLOC_FAT_CHAIN; |
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ei->type = TYPE_DIR; |
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ei->version = 0; |
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ei->hint_bmap.off = EXFAT_EOF_CLUSTER; |
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ei->hint_stat.eidx = 0; |
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ei->hint_stat.clu = sbi->root_dir; |
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ei->hint_femp.eidx = EXFAT_HINT_NONE; |
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exfat_chain_set(&cdir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); |
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if (exfat_count_num_clusters(sb, &cdir, &num_clu)) |
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return -EIO; |
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i_size_write(inode, num_clu << sbi->cluster_size_bits); |
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num_subdirs = exfat_count_dir_entries(sb, &cdir); |
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if (num_subdirs < 0) |
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return -EIO; |
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set_nlink(inode, num_subdirs + EXFAT_MIN_SUBDIR); |
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inode->i_uid = sbi->options.fs_uid; |
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inode->i_gid = sbi->options.fs_gid; |
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inode_inc_iversion(inode); |
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inode->i_generation = 0; |
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inode->i_mode = exfat_make_mode(sbi, ATTR_SUBDIR, 0777); |
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inode->i_op = &exfat_dir_inode_operations; |
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inode->i_fop = &exfat_dir_operations; |
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inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> |
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inode->i_blkbits; |
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ei->i_pos = ((loff_t)sbi->root_dir << 32) | 0xffffffff; |
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ei->i_size_aligned = i_size_read(inode); |
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ei->i_size_ondisk = i_size_read(inode); |
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exfat_save_attr(inode, ATTR_SUBDIR); |
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inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime = |
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current_time(inode); |
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exfat_truncate_atime(&inode->i_atime); |
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return 0; |
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} |
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static int exfat_calibrate_blocksize(struct super_block *sb, int logical_sect) |
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{ |
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struct exfat_sb_info *sbi = EXFAT_SB(sb); |
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if (!is_power_of_2(logical_sect)) { |
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exfat_err(sb, "bogus logical sector size %u", logical_sect); |
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return -EIO; |
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} |
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if (logical_sect < sb->s_blocksize) { |
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exfat_err(sb, "logical sector size too small for device (logical sector size = %u)", |
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logical_sect); |
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return -EIO; |
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} |
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if (logical_sect > sb->s_blocksize) { |
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brelse(sbi->boot_bh); |
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sbi->boot_bh = NULL; |
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if (!sb_set_blocksize(sb, logical_sect)) { |
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exfat_err(sb, "unable to set blocksize %u", |
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logical_sect); |
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return -EIO; |
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} |
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sbi->boot_bh = sb_bread(sb, 0); |
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if (!sbi->boot_bh) { |
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exfat_err(sb, "unable to read boot sector (logical sector size = %lu)", |
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sb->s_blocksize); |
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return -EIO; |
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} |
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} |
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return 0; |
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} |
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static int exfat_read_boot_sector(struct super_block *sb) |
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{ |
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struct boot_sector *p_boot; |
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struct exfat_sb_info *sbi = EXFAT_SB(sb); |
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/* set block size to read super block */ |
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sb_min_blocksize(sb, 512); |
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/* read boot sector */ |
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sbi->boot_bh = sb_bread(sb, 0); |
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if (!sbi->boot_bh) { |
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exfat_err(sb, "unable to read boot sector"); |
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return -EIO; |
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} |
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p_boot = (struct boot_sector *)sbi->boot_bh->b_data; |
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/* check the validity of BOOT */ |
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if (le16_to_cpu((p_boot->signature)) != BOOT_SIGNATURE) { |
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exfat_err(sb, "invalid boot record signature"); |
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return -EINVAL; |
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} |
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if (memcmp(p_boot->fs_name, STR_EXFAT, BOOTSEC_FS_NAME_LEN)) { |
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exfat_err(sb, "invalid fs_name"); /* fs_name may unprintable */ |
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return -EINVAL; |
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} |
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/* |
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* must_be_zero field must be filled with zero to prevent mounting |
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* from FAT volume. |
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*/ |
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if (memchr_inv(p_boot->must_be_zero, 0, sizeof(p_boot->must_be_zero))) |
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return -EINVAL; |
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if (p_boot->num_fats != 1 && p_boot->num_fats != 2) { |
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exfat_err(sb, "bogus number of FAT structure"); |
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return -EINVAL; |
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} |
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|
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/* |
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* sect_size_bits could be at least 9 and at most 12. |
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*/ |
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if (p_boot->sect_size_bits < EXFAT_MIN_SECT_SIZE_BITS || |
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p_boot->sect_size_bits > EXFAT_MAX_SECT_SIZE_BITS) { |
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exfat_err(sb, "bogus sector size bits : %u", |
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p_boot->sect_size_bits); |
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return -EINVAL; |
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} |
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/* |
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* sect_per_clus_bits could be at least 0 and at most 25 - sect_size_bits. |
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*/ |
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if (p_boot->sect_per_clus_bits > EXFAT_MAX_SECT_PER_CLUS_BITS(p_boot)) { |
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exfat_err(sb, "bogus sectors bits per cluster : %u", |
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p_boot->sect_per_clus_bits); |
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return -EINVAL; |
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} |
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sbi->sect_per_clus = 1 << p_boot->sect_per_clus_bits; |
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sbi->sect_per_clus_bits = p_boot->sect_per_clus_bits; |
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sbi->cluster_size_bits = p_boot->sect_per_clus_bits + |
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p_boot->sect_size_bits; |
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sbi->cluster_size = 1 << sbi->cluster_size_bits; |
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sbi->num_FAT_sectors = le32_to_cpu(p_boot->fat_length); |
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sbi->FAT1_start_sector = le32_to_cpu(p_boot->fat_offset); |
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sbi->FAT2_start_sector = le32_to_cpu(p_boot->fat_offset); |
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if (p_boot->num_fats == 2) |
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sbi->FAT2_start_sector += sbi->num_FAT_sectors; |
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sbi->data_start_sector = le32_to_cpu(p_boot->clu_offset); |
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sbi->num_sectors = le64_to_cpu(p_boot->vol_length); |
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/* because the cluster index starts with 2 */ |
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sbi->num_clusters = le32_to_cpu(p_boot->clu_count) + |
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EXFAT_RESERVED_CLUSTERS; |
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|
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sbi->root_dir = le32_to_cpu(p_boot->root_cluster); |
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sbi->dentries_per_clu = 1 << |
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(sbi->cluster_size_bits - DENTRY_SIZE_BITS); |
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|
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sbi->vol_flags = le16_to_cpu(p_boot->vol_flags); |
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sbi->vol_flags_persistent = sbi->vol_flags & (VOLUME_DIRTY | MEDIA_FAILURE); |
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sbi->clu_srch_ptr = EXFAT_FIRST_CLUSTER; |
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sbi->used_clusters = EXFAT_CLUSTERS_UNTRACKED; |
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|
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/* check consistencies */ |
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if ((u64)sbi->num_FAT_sectors << p_boot->sect_size_bits < |
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(u64)sbi->num_clusters * 4) { |
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exfat_err(sb, "bogus fat length"); |
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return -EINVAL; |
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} |
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|
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if (sbi->data_start_sector < |
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(u64)sbi->FAT1_start_sector + |
|
(u64)sbi->num_FAT_sectors * p_boot->num_fats) { |
|
exfat_err(sb, "bogus data start sector"); |
|
return -EINVAL; |
|
} |
|
|
|
if (sbi->vol_flags & VOLUME_DIRTY) |
|
exfat_warn(sb, "Volume was not properly unmounted. Some data may be corrupt. Please run fsck."); |
|
if (sbi->vol_flags & MEDIA_FAILURE) |
|
exfat_warn(sb, "Medium has reported failures. Some data may be lost."); |
|
|
|
/* exFAT file size is limited by a disk volume size */ |
|
sb->s_maxbytes = (u64)(sbi->num_clusters - EXFAT_RESERVED_CLUSTERS) << |
|
sbi->cluster_size_bits; |
|
|
|
/* check logical sector size */ |
|
if (exfat_calibrate_blocksize(sb, 1 << p_boot->sect_size_bits)) |
|
return -EIO; |
|
|
|
return 0; |
|
} |
|
|
|
static int exfat_verify_boot_region(struct super_block *sb) |
|
{ |
|
struct buffer_head *bh = NULL; |
|
u32 chksum = 0; |
|
__le32 *p_sig, *p_chksum; |
|
int sn, i; |
|
|
|
/* read boot sector sub-regions */ |
|
for (sn = 0; sn < 11; sn++) { |
|
bh = sb_bread(sb, sn); |
|
if (!bh) |
|
return -EIO; |
|
|
|
if (sn != 0 && sn <= 8) { |
|
/* extended boot sector sub-regions */ |
|
p_sig = (__le32 *)&bh->b_data[sb->s_blocksize - 4]; |
|
if (le32_to_cpu(*p_sig) != EXBOOT_SIGNATURE) |
|
exfat_warn(sb, "Invalid exboot-signature(sector = %d): 0x%08x", |
|
sn, le32_to_cpu(*p_sig)); |
|
} |
|
|
|
chksum = exfat_calc_chksum32(bh->b_data, sb->s_blocksize, |
|
chksum, sn ? CS_DEFAULT : CS_BOOT_SECTOR); |
|
brelse(bh); |
|
} |
|
|
|
/* boot checksum sub-regions */ |
|
bh = sb_bread(sb, sn); |
|
if (!bh) |
|
return -EIO; |
|
|
|
for (i = 0; i < sb->s_blocksize; i += sizeof(u32)) { |
|
p_chksum = (__le32 *)&bh->b_data[i]; |
|
if (le32_to_cpu(*p_chksum) != chksum) { |
|
exfat_err(sb, "Invalid boot checksum (boot checksum : 0x%08x, checksum : 0x%08x)", |
|
le32_to_cpu(*p_chksum), chksum); |
|
brelse(bh); |
|
return -EINVAL; |
|
} |
|
} |
|
brelse(bh); |
|
return 0; |
|
} |
|
|
|
/* mount the file system volume */ |
|
static int __exfat_fill_super(struct super_block *sb) |
|
{ |
|
int ret; |
|
struct exfat_sb_info *sbi = EXFAT_SB(sb); |
|
|
|
ret = exfat_read_boot_sector(sb); |
|
if (ret) { |
|
exfat_err(sb, "failed to read boot sector"); |
|
goto free_bh; |
|
} |
|
|
|
ret = exfat_verify_boot_region(sb); |
|
if (ret) { |
|
exfat_err(sb, "invalid boot region"); |
|
goto free_bh; |
|
} |
|
|
|
ret = exfat_create_upcase_table(sb); |
|
if (ret) { |
|
exfat_err(sb, "failed to load upcase table"); |
|
goto free_bh; |
|
} |
|
|
|
ret = exfat_load_bitmap(sb); |
|
if (ret) { |
|
exfat_err(sb, "failed to load alloc-bitmap"); |
|
goto free_upcase_table; |
|
} |
|
|
|
ret = exfat_count_used_clusters(sb, &sbi->used_clusters); |
|
if (ret) { |
|
exfat_err(sb, "failed to scan clusters"); |
|
goto free_alloc_bitmap; |
|
} |
|
|
|
return 0; |
|
|
|
free_alloc_bitmap: |
|
exfat_free_bitmap(sbi); |
|
free_upcase_table: |
|
exfat_free_upcase_table(sbi); |
|
free_bh: |
|
brelse(sbi->boot_bh); |
|
return ret; |
|
} |
|
|
|
static int exfat_fill_super(struct super_block *sb, struct fs_context *fc) |
|
{ |
|
struct exfat_sb_info *sbi = sb->s_fs_info; |
|
struct exfat_mount_options *opts = &sbi->options; |
|
struct inode *root_inode; |
|
int err; |
|
|
|
if (opts->allow_utime == (unsigned short)-1) |
|
opts->allow_utime = ~opts->fs_dmask & 0022; |
|
|
|
if (opts->discard && !bdev_max_discard_sectors(sb->s_bdev)) { |
|
exfat_warn(sb, "mounting with \"discard\" option, but the device does not support discard"); |
|
opts->discard = 0; |
|
} |
|
|
|
sb->s_flags |= SB_NODIRATIME; |
|
sb->s_magic = EXFAT_SUPER_MAGIC; |
|
sb->s_op = &exfat_sops; |
|
|
|
sb->s_time_gran = 10 * NSEC_PER_MSEC; |
|
sb->s_time_min = EXFAT_MIN_TIMESTAMP_SECS; |
|
sb->s_time_max = EXFAT_MAX_TIMESTAMP_SECS; |
|
|
|
err = __exfat_fill_super(sb); |
|
if (err) { |
|
exfat_err(sb, "failed to recognize exfat type"); |
|
goto check_nls_io; |
|
} |
|
|
|
/* set up enough so that it can read an inode */ |
|
exfat_hash_init(sb); |
|
|
|
if (!strcmp(sbi->options.iocharset, "utf8")) |
|
opts->utf8 = 1; |
|
else { |
|
sbi->nls_io = load_nls(sbi->options.iocharset); |
|
if (!sbi->nls_io) { |
|
exfat_err(sb, "IO charset %s not found", |
|
sbi->options.iocharset); |
|
err = -EINVAL; |
|
goto free_table; |
|
} |
|
} |
|
|
|
if (sbi->options.utf8) |
|
sb->s_d_op = &exfat_utf8_dentry_ops; |
|
else |
|
sb->s_d_op = &exfat_dentry_ops; |
|
|
|
root_inode = new_inode(sb); |
|
if (!root_inode) { |
|
exfat_err(sb, "failed to allocate root inode"); |
|
err = -ENOMEM; |
|
goto free_table; |
|
} |
|
|
|
root_inode->i_ino = EXFAT_ROOT_INO; |
|
inode_set_iversion(root_inode, 1); |
|
err = exfat_read_root(root_inode); |
|
if (err) { |
|
exfat_err(sb, "failed to initialize root inode"); |
|
goto put_inode; |
|
} |
|
|
|
exfat_hash_inode(root_inode, EXFAT_I(root_inode)->i_pos); |
|
insert_inode_hash(root_inode); |
|
|
|
sb->s_root = d_make_root(root_inode); |
|
if (!sb->s_root) { |
|
exfat_err(sb, "failed to get the root dentry"); |
|
err = -ENOMEM; |
|
goto free_table; |
|
} |
|
|
|
return 0; |
|
|
|
put_inode: |
|
iput(root_inode); |
|
sb->s_root = NULL; |
|
|
|
free_table: |
|
exfat_free_upcase_table(sbi); |
|
exfat_free_bitmap(sbi); |
|
brelse(sbi->boot_bh); |
|
|
|
check_nls_io: |
|
unload_nls(sbi->nls_io); |
|
exfat_free_iocharset(sbi); |
|
sb->s_fs_info = NULL; |
|
kfree(sbi); |
|
return err; |
|
} |
|
|
|
static int exfat_get_tree(struct fs_context *fc) |
|
{ |
|
return get_tree_bdev(fc, exfat_fill_super); |
|
} |
|
|
|
static void exfat_free(struct fs_context *fc) |
|
{ |
|
struct exfat_sb_info *sbi = fc->s_fs_info; |
|
|
|
if (sbi) { |
|
exfat_free_iocharset(sbi); |
|
kfree(sbi); |
|
} |
|
} |
|
|
|
static int exfat_reconfigure(struct fs_context *fc) |
|
{ |
|
fc->sb_flags |= SB_NODIRATIME; |
|
|
|
/* volume flag will be updated in exfat_sync_fs */ |
|
sync_filesystem(fc->root->d_sb); |
|
return 0; |
|
} |
|
|
|
static const struct fs_context_operations exfat_context_ops = { |
|
.parse_param = exfat_parse_param, |
|
.get_tree = exfat_get_tree, |
|
.free = exfat_free, |
|
.reconfigure = exfat_reconfigure, |
|
}; |
|
|
|
static int exfat_init_fs_context(struct fs_context *fc) |
|
{ |
|
struct exfat_sb_info *sbi; |
|
|
|
sbi = kzalloc(sizeof(struct exfat_sb_info), GFP_KERNEL); |
|
if (!sbi) |
|
return -ENOMEM; |
|
|
|
mutex_init(&sbi->s_lock); |
|
mutex_init(&sbi->bitmap_lock); |
|
ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL, |
|
DEFAULT_RATELIMIT_BURST); |
|
|
|
sbi->options.fs_uid = current_uid(); |
|
sbi->options.fs_gid = current_gid(); |
|
sbi->options.fs_fmask = current->fs->umask; |
|
sbi->options.fs_dmask = current->fs->umask; |
|
sbi->options.allow_utime = -1; |
|
sbi->options.iocharset = exfat_default_iocharset; |
|
sbi->options.errors = EXFAT_ERRORS_RO; |
|
|
|
fc->s_fs_info = sbi; |
|
fc->ops = &exfat_context_ops; |
|
return 0; |
|
} |
|
|
|
static struct file_system_type exfat_fs_type = { |
|
.owner = THIS_MODULE, |
|
.name = "exfat", |
|
.init_fs_context = exfat_init_fs_context, |
|
.parameters = exfat_parameters, |
|
.kill_sb = kill_block_super, |
|
.fs_flags = FS_REQUIRES_DEV, |
|
}; |
|
|
|
static void exfat_inode_init_once(void *foo) |
|
{ |
|
struct exfat_inode_info *ei = (struct exfat_inode_info *)foo; |
|
|
|
spin_lock_init(&ei->cache_lru_lock); |
|
ei->nr_caches = 0; |
|
ei->cache_valid_id = EXFAT_CACHE_VALID + 1; |
|
INIT_LIST_HEAD(&ei->cache_lru); |
|
INIT_HLIST_NODE(&ei->i_hash_fat); |
|
inode_init_once(&ei->vfs_inode); |
|
} |
|
|
|
static int __init init_exfat_fs(void) |
|
{ |
|
int err; |
|
|
|
err = exfat_cache_init(); |
|
if (err) |
|
return err; |
|
|
|
exfat_inode_cachep = kmem_cache_create("exfat_inode_cache", |
|
sizeof(struct exfat_inode_info), |
|
0, SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, |
|
exfat_inode_init_once); |
|
if (!exfat_inode_cachep) { |
|
err = -ENOMEM; |
|
goto shutdown_cache; |
|
} |
|
|
|
err = register_filesystem(&exfat_fs_type); |
|
if (err) |
|
goto destroy_cache; |
|
|
|
return 0; |
|
|
|
destroy_cache: |
|
kmem_cache_destroy(exfat_inode_cachep); |
|
shutdown_cache: |
|
exfat_cache_shutdown(); |
|
return err; |
|
} |
|
|
|
static void __exit exit_exfat_fs(void) |
|
{ |
|
/* |
|
* Make sure all delayed rcu free inodes are flushed before we |
|
* destroy cache. |
|
*/ |
|
rcu_barrier(); |
|
kmem_cache_destroy(exfat_inode_cachep); |
|
unregister_filesystem(&exfat_fs_type); |
|
exfat_cache_shutdown(); |
|
} |
|
|
|
module_init(init_exfat_fs); |
|
module_exit(exit_exfat_fs); |
|
|
|
MODULE_ALIAS_FS("exfat"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_DESCRIPTION("exFAT filesystem support"); |
|
MODULE_AUTHOR("Samsung Electronics Co., Ltd.");
|
|
|