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524 lines
17 KiB
524 lines
17 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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#ifndef _EXFAT_FS_H |
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#define _EXFAT_FS_H |
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#include <linux/fs.h> |
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#include <linux/ratelimit.h> |
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#include <linux/nls.h> |
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#define EXFAT_SUPER_MAGIC 0x2011BAB0UL |
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#define EXFAT_ROOT_INO 1 |
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#define EXFAT_CLUSTERS_UNTRACKED (~0u) |
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/* |
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* exfat error flags |
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*/ |
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enum exfat_error_mode { |
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EXFAT_ERRORS_CONT, /* ignore error and continue */ |
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EXFAT_ERRORS_PANIC, /* panic on error */ |
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EXFAT_ERRORS_RO, /* remount r/o on error */ |
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}; |
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/* |
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* exfat nls lossy flag |
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*/ |
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enum { |
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NLS_NAME_NO_LOSSY, /* no lossy */ |
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NLS_NAME_LOSSY, /* just detected incorrect filename(s) */ |
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NLS_NAME_OVERLEN, /* the length is over than its limit */ |
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}; |
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#define EXFAT_HASH_BITS 8 |
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#define EXFAT_HASH_SIZE (1UL << EXFAT_HASH_BITS) |
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/* |
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* Type Definitions |
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*/ |
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#define ES_2_ENTRIES 2 |
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#define ES_ALL_ENTRIES 0 |
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#define DIR_DELETED 0xFFFF0321 |
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/* type values */ |
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#define TYPE_UNUSED 0x0000 |
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#define TYPE_DELETED 0x0001 |
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#define TYPE_INVALID 0x0002 |
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#define TYPE_CRITICAL_PRI 0x0100 |
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#define TYPE_BITMAP 0x0101 |
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#define TYPE_UPCASE 0x0102 |
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#define TYPE_VOLUME 0x0103 |
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#define TYPE_DIR 0x0104 |
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#define TYPE_FILE 0x011F |
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#define TYPE_CRITICAL_SEC 0x0200 |
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#define TYPE_STREAM 0x0201 |
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#define TYPE_EXTEND 0x0202 |
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#define TYPE_ACL 0x0203 |
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#define TYPE_BENIGN_PRI 0x0400 |
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#define TYPE_GUID 0x0401 |
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#define TYPE_PADDING 0x0402 |
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#define TYPE_ACLTAB 0x0403 |
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#define TYPE_BENIGN_SEC 0x0800 |
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#define TYPE_ALL 0x0FFF |
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#define MAX_CHARSET_SIZE 6 /* max size of multi-byte character */ |
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#define MAX_NAME_LENGTH 255 /* max len of file name excluding NULL */ |
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#define MAX_VFSNAME_BUF_SIZE ((MAX_NAME_LENGTH + 1) * MAX_CHARSET_SIZE) |
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/* Enough size to hold 256 dentry (even 512 Byte sector) */ |
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#define DIR_CACHE_SIZE (256*sizeof(struct exfat_dentry)/512+1) |
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#define EXFAT_HINT_NONE -1 |
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#define EXFAT_MIN_SUBDIR 2 |
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/* |
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* helpers for cluster size to byte conversion. |
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*/ |
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#define EXFAT_CLU_TO_B(b, sbi) ((b) << (sbi)->cluster_size_bits) |
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#define EXFAT_B_TO_CLU(b, sbi) ((b) >> (sbi)->cluster_size_bits) |
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#define EXFAT_B_TO_CLU_ROUND_UP(b, sbi) \ |
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(((b - 1) >> (sbi)->cluster_size_bits) + 1) |
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#define EXFAT_CLU_OFFSET(off, sbi) ((off) & ((sbi)->cluster_size - 1)) |
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/* |
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* helpers for block size to byte conversion. |
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*/ |
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#define EXFAT_BLK_TO_B(b, sb) ((b) << (sb)->s_blocksize_bits) |
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#define EXFAT_B_TO_BLK(b, sb) ((b) >> (sb)->s_blocksize_bits) |
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#define EXFAT_B_TO_BLK_ROUND_UP(b, sb) \ |
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(((b - 1) >> (sb)->s_blocksize_bits) + 1) |
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#define EXFAT_BLK_OFFSET(off, sb) ((off) & ((sb)->s_blocksize - 1)) |
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/* |
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* helpers for block size to dentry size conversion. |
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*/ |
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#define EXFAT_B_TO_DEN_IDX(b, sbi) \ |
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((b) << ((sbi)->cluster_size_bits - DENTRY_SIZE_BITS)) |
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#define EXFAT_B_TO_DEN(b) ((b) >> DENTRY_SIZE_BITS) |
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#define EXFAT_DEN_TO_B(b) ((b) << DENTRY_SIZE_BITS) |
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/* |
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* helpers for fat entry. |
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*/ |
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#define FAT_ENT_SIZE (4) |
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#define FAT_ENT_SIZE_BITS (2) |
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#define FAT_ENT_OFFSET_SECTOR(sb, loc) (EXFAT_SB(sb)->FAT1_start_sector + \ |
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(((u64)loc << FAT_ENT_SIZE_BITS) >> sb->s_blocksize_bits)) |
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#define FAT_ENT_OFFSET_BYTE_IN_SECTOR(sb, loc) \ |
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((loc << FAT_ENT_SIZE_BITS) & (sb->s_blocksize - 1)) |
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/* |
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* helpers for bitmap. |
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*/ |
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#define CLUSTER_TO_BITMAP_ENT(clu) ((clu) - EXFAT_RESERVED_CLUSTERS) |
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#define BITMAP_ENT_TO_CLUSTER(ent) ((ent) + EXFAT_RESERVED_CLUSTERS) |
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#define BITS_PER_SECTOR(sb) ((sb)->s_blocksize * BITS_PER_BYTE) |
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#define BITS_PER_SECTOR_MASK(sb) (BITS_PER_SECTOR(sb) - 1) |
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#define BITMAP_OFFSET_SECTOR_INDEX(sb, ent) \ |
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((ent / BITS_PER_BYTE) >> (sb)->s_blocksize_bits) |
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#define BITMAP_OFFSET_BIT_IN_SECTOR(sb, ent) (ent & BITS_PER_SECTOR_MASK(sb)) |
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#define BITMAP_OFFSET_BYTE_IN_SECTOR(sb, ent) \ |
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((ent / BITS_PER_BYTE) & ((sb)->s_blocksize - 1)) |
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#define BITS_PER_BYTE_MASK 0x7 |
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#define IGNORED_BITS_REMAINED(clu, clu_base) ((1 << ((clu) - (clu_base))) - 1) |
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struct exfat_dentry_namebuf { |
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char *lfn; |
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int lfnbuf_len; /* usually MAX_UNINAME_BUF_SIZE */ |
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}; |
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/* unicode name structure */ |
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struct exfat_uni_name { |
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/* +3 for null and for converting */ |
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unsigned short name[MAX_NAME_LENGTH + 3]; |
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u16 name_hash; |
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unsigned char name_len; |
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}; |
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/* directory structure */ |
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struct exfat_chain { |
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unsigned int dir; |
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unsigned int size; |
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unsigned char flags; |
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}; |
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/* first empty entry hint information */ |
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struct exfat_hint_femp { |
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/* entry index of a directory */ |
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int eidx; |
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/* count of continuous empty entry */ |
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int count; |
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/* the cluster that first empty slot exists in */ |
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struct exfat_chain cur; |
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}; |
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/* hint structure */ |
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struct exfat_hint { |
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unsigned int clu; |
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union { |
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unsigned int off; /* cluster offset */ |
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int eidx; /* entry index */ |
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}; |
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}; |
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struct exfat_entry_set_cache { |
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struct super_block *sb; |
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bool modified; |
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unsigned int start_off; |
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int num_bh; |
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struct buffer_head *bh[DIR_CACHE_SIZE]; |
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unsigned int num_entries; |
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}; |
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struct exfat_dir_entry { |
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struct exfat_chain dir; |
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int entry; |
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unsigned int type; |
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unsigned int start_clu; |
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unsigned char flags; |
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unsigned short attr; |
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loff_t size; |
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unsigned int num_subdirs; |
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struct timespec64 atime; |
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struct timespec64 mtime; |
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struct timespec64 crtime; |
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struct exfat_dentry_namebuf namebuf; |
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}; |
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/* |
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* exfat mount in-memory data |
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*/ |
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struct exfat_mount_options { |
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kuid_t fs_uid; |
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kgid_t fs_gid; |
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unsigned short fs_fmask; |
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unsigned short fs_dmask; |
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/* permission for setting the [am]time */ |
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unsigned short allow_utime; |
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/* charset for filename input/display */ |
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char *iocharset; |
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/* on error: continue, panic, remount-ro */ |
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enum exfat_error_mode errors; |
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unsigned utf8:1, /* Use of UTF-8 character set */ |
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discard:1; /* Issue discard requests on deletions */ |
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int time_offset; /* Offset of timestamps from UTC (in minutes) */ |
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}; |
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/* |
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* EXFAT file system superblock in-memory data |
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*/ |
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struct exfat_sb_info { |
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unsigned long long num_sectors; /* num of sectors in volume */ |
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unsigned int num_clusters; /* num of clusters in volume */ |
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unsigned int cluster_size; /* cluster size in bytes */ |
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unsigned int cluster_size_bits; |
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unsigned int sect_per_clus; /* cluster size in sectors */ |
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unsigned int sect_per_clus_bits; |
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unsigned long long FAT1_start_sector; /* FAT1 start sector */ |
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unsigned long long FAT2_start_sector; /* FAT2 start sector */ |
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unsigned long long data_start_sector; /* data area start sector */ |
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unsigned int num_FAT_sectors; /* num of FAT sectors */ |
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unsigned int root_dir; /* root dir cluster */ |
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unsigned int dentries_per_clu; /* num of dentries per cluster */ |
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unsigned int vol_flags; /* volume flags */ |
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unsigned int vol_flags_persistent; /* volume flags to retain */ |
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struct buffer_head *boot_bh; /* buffer_head of BOOT sector */ |
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unsigned int map_clu; /* allocation bitmap start cluster */ |
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unsigned int map_sectors; /* num of allocation bitmap sectors */ |
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struct buffer_head **vol_amap; /* allocation bitmap */ |
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unsigned short *vol_utbl; /* upcase table */ |
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unsigned int clu_srch_ptr; /* cluster search pointer */ |
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unsigned int used_clusters; /* number of used clusters */ |
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struct mutex s_lock; /* superblock lock */ |
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struct exfat_mount_options options; |
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struct nls_table *nls_io; /* Charset used for input and display */ |
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struct ratelimit_state ratelimit; |
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spinlock_t inode_hash_lock; |
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struct hlist_head inode_hashtable[EXFAT_HASH_SIZE]; |
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struct rcu_head rcu; |
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}; |
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#define EXFAT_CACHE_VALID 0 |
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/* |
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* EXFAT file system inode in-memory data |
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*/ |
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struct exfat_inode_info { |
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struct exfat_chain dir; |
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int entry; |
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unsigned int type; |
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unsigned short attr; |
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unsigned int start_clu; |
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unsigned char flags; |
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/* |
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* the copy of low 32bit of i_version to check |
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* the validation of hint_stat. |
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*/ |
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unsigned int version; |
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/* hint for cluster last accessed */ |
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struct exfat_hint hint_bmap; |
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/* hint for entry index we try to lookup next time */ |
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struct exfat_hint hint_stat; |
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/* hint for first empty entry */ |
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struct exfat_hint_femp hint_femp; |
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spinlock_t cache_lru_lock; |
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struct list_head cache_lru; |
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int nr_caches; |
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/* for avoiding the race between alloc and free */ |
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unsigned int cache_valid_id; |
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/* |
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* NOTE: i_size_ondisk is 64bits, so must hold ->inode_lock to access. |
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* physically allocated size. |
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*/ |
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loff_t i_size_ondisk; |
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/* block-aligned i_size (used in cont_write_begin) */ |
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loff_t i_size_aligned; |
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/* on-disk position of directory entry or 0 */ |
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loff_t i_pos; |
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/* hash by i_location */ |
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struct hlist_node i_hash_fat; |
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/* protect bmap against truncate */ |
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struct rw_semaphore truncate_lock; |
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struct inode vfs_inode; |
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/* File creation time */ |
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struct timespec64 i_crtime; |
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}; |
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static inline struct exfat_sb_info *EXFAT_SB(struct super_block *sb) |
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{ |
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return sb->s_fs_info; |
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} |
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static inline struct exfat_inode_info *EXFAT_I(struct inode *inode) |
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{ |
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return container_of(inode, struct exfat_inode_info, vfs_inode); |
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} |
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/* |
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* If ->i_mode can't hold 0222 (i.e. ATTR_RO), we use ->i_attrs to |
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* save ATTR_RO instead of ->i_mode. |
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* |
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* If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only |
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* bit, it's just used as flag for app. |
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*/ |
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static inline int exfat_mode_can_hold_ro(struct inode *inode) |
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{ |
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struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); |
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if (S_ISDIR(inode->i_mode)) |
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return 0; |
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if ((~sbi->options.fs_fmask) & 0222) |
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return 1; |
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return 0; |
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} |
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/* Convert attribute bits and a mask to the UNIX mode. */ |
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static inline mode_t exfat_make_mode(struct exfat_sb_info *sbi, |
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unsigned short attr, mode_t mode) |
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{ |
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if ((attr & ATTR_READONLY) && !(attr & ATTR_SUBDIR)) |
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mode &= ~0222; |
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if (attr & ATTR_SUBDIR) |
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return (mode & ~sbi->options.fs_dmask) | S_IFDIR; |
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return (mode & ~sbi->options.fs_fmask) | S_IFREG; |
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} |
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/* Return the FAT attribute byte for this inode */ |
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static inline unsigned short exfat_make_attr(struct inode *inode) |
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{ |
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unsigned short attr = EXFAT_I(inode)->attr; |
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if (S_ISDIR(inode->i_mode)) |
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attr |= ATTR_SUBDIR; |
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if (exfat_mode_can_hold_ro(inode) && !(inode->i_mode & 0222)) |
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attr |= ATTR_READONLY; |
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return attr; |
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} |
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static inline void exfat_save_attr(struct inode *inode, unsigned short attr) |
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{ |
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if (exfat_mode_can_hold_ro(inode)) |
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EXFAT_I(inode)->attr = attr & (ATTR_RWMASK | ATTR_READONLY); |
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else |
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EXFAT_I(inode)->attr = attr & ATTR_RWMASK; |
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} |
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static inline bool exfat_is_last_sector_in_cluster(struct exfat_sb_info *sbi, |
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sector_t sec) |
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{ |
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return ((sec - sbi->data_start_sector + 1) & |
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((1 << sbi->sect_per_clus_bits) - 1)) == 0; |
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} |
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static inline sector_t exfat_cluster_to_sector(struct exfat_sb_info *sbi, |
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unsigned int clus) |
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{ |
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return ((sector_t)(clus - EXFAT_RESERVED_CLUSTERS) << sbi->sect_per_clus_bits) + |
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sbi->data_start_sector; |
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} |
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static inline int exfat_sector_to_cluster(struct exfat_sb_info *sbi, |
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sector_t sec) |
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{ |
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return ((sec - sbi->data_start_sector) >> sbi->sect_per_clus_bits) + |
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EXFAT_RESERVED_CLUSTERS; |
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} |
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/* super.c */ |
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int exfat_set_volume_dirty(struct super_block *sb); |
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int exfat_clear_volume_dirty(struct super_block *sb); |
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/* fatent.c */ |
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#define exfat_get_next_cluster(sb, pclu) exfat_ent_get(sb, *(pclu), pclu) |
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int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc, |
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struct exfat_chain *p_chain); |
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int exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain); |
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int exfat_ent_get(struct super_block *sb, unsigned int loc, |
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unsigned int *content); |
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int exfat_ent_set(struct super_block *sb, unsigned int loc, |
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unsigned int content); |
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int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir, |
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int entry, struct exfat_dentry *p_entry); |
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int exfat_chain_cont_cluster(struct super_block *sb, unsigned int chain, |
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unsigned int len); |
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int exfat_zeroed_cluster(struct inode *dir, unsigned int clu); |
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int exfat_find_last_cluster(struct super_block *sb, struct exfat_chain *p_chain, |
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unsigned int *ret_clu); |
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int exfat_count_num_clusters(struct super_block *sb, |
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struct exfat_chain *p_chain, unsigned int *ret_count); |
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/* balloc.c */ |
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int exfat_load_bitmap(struct super_block *sb); |
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void exfat_free_bitmap(struct exfat_sb_info *sbi); |
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int exfat_set_bitmap(struct inode *inode, unsigned int clu); |
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void exfat_clear_bitmap(struct inode *inode, unsigned int clu, bool sync); |
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unsigned int exfat_find_free_bitmap(struct super_block *sb, unsigned int clu); |
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int exfat_count_used_clusters(struct super_block *sb, unsigned int *ret_count); |
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/* file.c */ |
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extern const struct file_operations exfat_file_operations; |
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int __exfat_truncate(struct inode *inode, loff_t new_size); |
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void exfat_truncate(struct inode *inode, loff_t size); |
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int exfat_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, |
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struct iattr *attr); |
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int exfat_getattr(struct user_namespace *mnt_userns, const struct path *path, |
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struct kstat *stat, unsigned int request_mask, |
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unsigned int query_flags); |
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int exfat_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); |
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/* namei.c */ |
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extern const struct dentry_operations exfat_dentry_ops; |
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extern const struct dentry_operations exfat_utf8_dentry_ops; |
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/* cache.c */ |
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int exfat_cache_init(void); |
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void exfat_cache_shutdown(void); |
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void exfat_cache_inval_inode(struct inode *inode); |
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int exfat_get_cluster(struct inode *inode, unsigned int cluster, |
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unsigned int *fclus, unsigned int *dclus, |
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unsigned int *last_dclus, int allow_eof); |
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/* dir.c */ |
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extern const struct inode_operations exfat_dir_inode_operations; |
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extern const struct file_operations exfat_dir_operations; |
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unsigned int exfat_get_entry_type(struct exfat_dentry *p_entry); |
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int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir, |
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int entry, unsigned int type, unsigned int start_clu, |
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unsigned long long size); |
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int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir, |
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int entry, int num_entries, struct exfat_uni_name *p_uniname); |
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int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir, |
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int entry, int order, int num_entries); |
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int exfat_update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir, |
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int entry); |
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void exfat_update_dir_chksum_with_entry_set(struct exfat_entry_set_cache *es); |
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int exfat_calc_num_entries(struct exfat_uni_name *p_uniname); |
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int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei, |
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struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, |
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int num_entries, unsigned int type); |
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int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu); |
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int exfat_find_location(struct super_block *sb, struct exfat_chain *p_dir, |
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int entry, sector_t *sector, int *offset); |
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struct exfat_dentry *exfat_get_dentry(struct super_block *sb, |
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struct exfat_chain *p_dir, int entry, struct buffer_head **bh, |
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sector_t *sector); |
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struct exfat_dentry *exfat_get_dentry_cached(struct exfat_entry_set_cache *es, |
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int num); |
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struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb, |
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struct exfat_chain *p_dir, int entry, unsigned int type); |
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int exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync); |
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int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir); |
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/* inode.c */ |
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extern const struct inode_operations exfat_file_inode_operations; |
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void exfat_sync_inode(struct inode *inode); |
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struct inode *exfat_build_inode(struct super_block *sb, |
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struct exfat_dir_entry *info, loff_t i_pos); |
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void exfat_hash_inode(struct inode *inode, loff_t i_pos); |
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void exfat_unhash_inode(struct inode *inode); |
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struct inode *exfat_iget(struct super_block *sb, loff_t i_pos); |
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int exfat_write_inode(struct inode *inode, struct writeback_control *wbc); |
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void exfat_evict_inode(struct inode *inode); |
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int exfat_block_truncate_page(struct inode *inode, loff_t from); |
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/* exfat/nls.c */ |
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unsigned short exfat_toupper(struct super_block *sb, unsigned short a); |
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int exfat_uniname_ncmp(struct super_block *sb, unsigned short *a, |
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unsigned short *b, unsigned int len); |
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int exfat_utf16_to_nls(struct super_block *sb, |
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struct exfat_uni_name *uniname, unsigned char *p_cstring, |
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int len); |
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int exfat_nls_to_utf16(struct super_block *sb, |
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const unsigned char *p_cstring, const int len, |
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struct exfat_uni_name *uniname, int *p_lossy); |
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int exfat_create_upcase_table(struct super_block *sb); |
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void exfat_free_upcase_table(struct exfat_sb_info *sbi); |
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/* exfat/misc.c */ |
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void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...) |
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__printf(3, 4) __cold; |
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#define exfat_fs_error(sb, fmt, args...) \ |
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__exfat_fs_error(sb, 1, fmt, ## args) |
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#define exfat_fs_error_ratelimit(sb, fmt, args...) \ |
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__exfat_fs_error(sb, __ratelimit(&EXFAT_SB(sb)->ratelimit), \ |
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fmt, ## args) |
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void exfat_msg(struct super_block *sb, const char *lv, const char *fmt, ...) |
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__printf(3, 4) __cold; |
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#define exfat_err(sb, fmt, ...) \ |
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exfat_msg(sb, KERN_ERR, fmt, ##__VA_ARGS__) |
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#define exfat_warn(sb, fmt, ...) \ |
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exfat_msg(sb, KERN_WARNING, fmt, ##__VA_ARGS__) |
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#define exfat_info(sb, fmt, ...) \ |
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exfat_msg(sb, KERN_INFO, fmt, ##__VA_ARGS__) |
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void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts, |
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u8 tz, __le16 time, __le16 date, u8 time_cs); |
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void exfat_truncate_atime(struct timespec64 *ts); |
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void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts, |
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u8 *tz, __le16 *time, __le16 *date, u8 *time_cs); |
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u16 exfat_calc_chksum16(void *data, int len, u16 chksum, int type); |
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u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type); |
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void exfat_update_bh(struct buffer_head *bh, int sync); |
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int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync); |
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void exfat_chain_set(struct exfat_chain *ec, unsigned int dir, |
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unsigned int size, unsigned char flags); |
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void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec); |
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#endif /* !_EXFAT_FS_H */
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