842 lines
21 KiB
C
842 lines
21 KiB
C
// 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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#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 "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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bool sync;
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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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if ((new_flags & VOLUME_DIRTY) && !buffer_dirty(sbi->boot_bh))
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sync = true;
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else
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sync = false;
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set_buffer_uptodate(sbi->boot_bh);
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mark_buffer_dirty(sbi->boot_bh);
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if (sync)
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sync_dirty_buffer(sbi->boot_bh);
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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->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 = kmem_cache_alloc(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_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_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_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 = ((i_size_read(inode) + (sbi->cluster_size - 1))
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& ~(sbi->cluster_size - 1)) >> inode->i_blkbits;
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EXFAT_I(inode)->i_pos = ((loff_t)sbi->root_dir << 32) | 0xffffffff;
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EXFAT_I(inode)->i_size_aligned = i_size_read(inode);
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EXFAT_I(inode)->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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* 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\n",
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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\n",
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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);
|
|
sbi->FAT1_start_sector = le32_to_cpu(p_boot->fat_offset);
|
|
sbi->FAT2_start_sector = le32_to_cpu(p_boot->fat_offset);
|
|
if (p_boot->num_fats == 2)
|
|
sbi->FAT2_start_sector += sbi->num_FAT_sectors;
|
|
sbi->data_start_sector = le32_to_cpu(p_boot->clu_offset);
|
|
sbi->num_sectors = le64_to_cpu(p_boot->vol_length);
|
|
/* because the cluster index starts with 2 */
|
|
sbi->num_clusters = le32_to_cpu(p_boot->clu_count) +
|
|
EXFAT_RESERVED_CLUSTERS;
|
|
|
|
sbi->root_dir = le32_to_cpu(p_boot->root_cluster);
|
|
sbi->dentries_per_clu = 1 <<
|
|
(sbi->cluster_size_bits - DENTRY_SIZE_BITS);
|
|
|
|
sbi->vol_flags = le16_to_cpu(p_boot->vol_flags);
|
|
sbi->vol_flags_persistent = sbi->vol_flags & (VOLUME_DIRTY | MEDIA_FAILURE);
|
|
sbi->clu_srch_ptr = EXFAT_FIRST_CLUSTER;
|
|
sbi->used_clusters = EXFAT_CLUSTERS_UNTRACKED;
|
|
|
|
/* check consistencies */
|
|
if ((u64)sbi->num_FAT_sectors << p_boot->sect_size_bits <
|
|
(u64)sbi->num_clusters * 4) {
|
|
exfat_err(sb, "bogus fat length");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (sbi->data_start_sector <
|
|
(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) {
|
|
struct request_queue *q = bdev_get_queue(sb->s_bdev);
|
|
|
|
if (!blk_queue_discard(q)) {
|
|
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.");
|