From patchwork Thu Jan 2 08:20:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Namjae Jeon X-Patchwork-Id: 11315489 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 48B13138D for ; Thu, 2 Jan 2020 08:25:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F391C217F4 for ; Thu, 2 Jan 2020 08:25:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b="RHVuGrsj" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727994AbgABIY7 (ORCPT ); Thu, 2 Jan 2020 03:24:59 -0500 Received: from mailout3.samsung.com ([203.254.224.33]:52800 "EHLO mailout3.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727739AbgABIYI (ORCPT ); Thu, 2 Jan 2020 03:24:08 -0500 Received: from epcas1p1.samsung.com (unknown [182.195.41.45]) by mailout3.samsung.com (KnoxPortal) with ESMTP id 20200102082402epoutp03aeef18e295329033e05c7dd4db999edd~mBEu5yRVF3210932109epoutp03R for ; Thu, 2 Jan 2020 08:24:02 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout3.samsung.com 20200102082402epoutp03aeef18e295329033e05c7dd4db999edd~mBEu5yRVF3210932109epoutp03R DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1577953442; bh=y2TDmsPDhLZFThQ15ndt+ijhB2LBTw/qurbtv2n3OrI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RHVuGrsjEzFAPKeRaS9RhGhfis/C4rlAHGUCUo3504fDDKXG12PMZE/jT46p78VI9 QDw6h108Chlfw1LKy2bELOJgkikca4DhyfICc3BdyVQZCP3Ewj9zYHcx1yR0/ZzJb8 5QjGhm7ba96XucAVthRp6SBzjRnHXX99XsDy9xS0= Received: from epsnrtp2.localdomain (unknown [182.195.42.163]) by epcas1p3.samsung.com (KnoxPortal) with ESMTP id 20200102082402epcas1p340e227917166c24054934f44a6c809df~mBEunMcXa2865228652epcas1p3N; Thu, 2 Jan 2020 08:24:02 +0000 (GMT) Received: from epsmges1p2.samsung.com (unknown [182.195.40.159]) by epsnrtp2.localdomain (Postfix) with ESMTP id 47pLfS6l3qzMqYkX; Thu, 2 Jan 2020 08:24:00 +0000 (GMT) Received: from epcas1p4.samsung.com ( [182.195.41.48]) by epsmges1p2.samsung.com (Symantec Messaging Gateway) with SMTP id 91.BD.48498.0A8AD0E5; Thu, 2 Jan 2020 17:24:00 +0900 (KST) Received: from epsmtrp2.samsung.com (unknown [182.195.40.14]) by epcas1p4.samsung.com (KnoxPortal) with ESMTPA id 20200102082400epcas1p4cd0ad14967bd8d231fc0efcede8bd99c~mBEs5wkWK2549925499epcas1p4V; Thu, 2 Jan 2020 08:24:00 +0000 (GMT) Received: from epsmgms1p1new.samsung.com (unknown [182.195.42.41]) by epsmtrp2.samsung.com (KnoxPortal) with ESMTP id 20200102082400epsmtrp2145dc2206cba0e590ec4c11cce31ede8~mBEs5GLE12039720397epsmtrp27; Thu, 2 Jan 2020 08:24:00 +0000 (GMT) X-AuditID: b6c32a36-a3dff7000001bd72-c2-5e0da8a0c42c Received: from epsmtip2.samsung.com ( [182.195.34.31]) by epsmgms1p1new.samsung.com (Symantec Messaging Gateway) with SMTP id A2.68.10238.0A8AD0E5; Thu, 2 Jan 2020 17:24:00 +0900 (KST) Received: from localhost.localdomain (unknown [10.88.103.87]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20200102082400epsmtip23d26b41edd7b895bf837a1eeafed3833~mBEsuuVLu2522625226epsmtip2k; Thu, 2 Jan 2020 08:24:00 +0000 (GMT) From: Namjae Jeon To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Cc: gregkh@linuxfoundation.org, valdis.kletnieks@vt.edu, hch@lst.de, sj1557.seo@samsung.com, linkinjeon@gmail.com, pali.rohar@gmail.com, Namjae Jeon Subject: [PATCH v9 01/13] exfat: add in-memory and on-disk structures and headers Date: Thu, 2 Jan 2020 16:20:24 +0800 Message-Id: <20200102082036.29643-2-namjae.jeon@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200102082036.29643-1-namjae.jeon@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA01SbUhTURjm7G5312h1W1mHRbYuSWhZm3N6C5dBoheUMKRvcl30MKV9ce9W WT+aRfmRmpZgmZUUlbnJQodNU7SZRIlGWn6hf+xPH6ZWaIZRbbuL+vec532e533Pew6ByRck CiLPbEOcmTVS+BJxS3eUKqauXpalaqyi6fN33Tj90NkjoocnxjC6veOFmB5sq8XpheqzdGXv ooj2/HomoQdmZsW7wpjWmgkp03nTJWWejDpwptzTAJhvTRGM7/EUnoEfNibmIjYHcUpkzrbk 5JkNOiotU79br41XqWPU2+kESmlmTUhHJadnxKTkGf1DUcoTrNHupzJYnqe27UzkLHYbUuZa eJuOQtYco1Wtsm7lWRNvNxu2ZltMO9QqVazWrzxmzO0buyS2Dr0ApwZKGyQO4HwASkAYAck4 OOUclpaAJYSc9AI47j0nCRTk5FcAWwcPCIV5AN+3O/wOIugYd0cLfAeAla42TDj4DT1vf4sC IpzcDH96wgNBq8gk2HyjSxzQYGQTgO2354IdVpKZsNdVigWwmIyELdWt0gCWkYnQV9McGm89 dD7qCmrCSB28PnMBDwRB0ovDzs6+kCgZPh0rDuGV8ONzj1TACvhtugMXpj4Dv3RiAl3kv813 nYA1cNT9SBKQYGQUdLdtE+gNsHXxZjARI5fB6blSiZAig0UX5YIkEpYPdIsEvBaWFM6GmjKw YHE6tJIKAAvryvEKEFHzr0MdAA1gNbLyJgPi1dbY/1+sCQR/XXS8F9zpT/cBkgDUUtnIraVZ cgl7gs83+QAkMGqV7OReWZZclsPmn0acRc/ZjYj3Aa1/kZWYIjzb4v/DZpterY3VaDR0XHxC vFZDrZERC6+PykkDa0PHEbIi7q9PRIQpHCAyZR8jLou8eo1KPb5uxNuWfnfsXn/XncnplHfv r9xPa/8efXDQri675nZ1d6cl7dmC5mLP9GV+qt9vfbP8SKWbIxQtiWlVGkVG+IPaDy1dLsbp dL4sOHR5aAXb+7T+1WcWNfbM639kOfInKxau929MNYR7OFvcpuLZiZfNxcVKSsznsupojOPZ P7nFLFqLAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrALMWRmVeSWpSXmKPExsWy7bCSvO6CFbxxBisb5C2aF69ns1i5+iiT xfW7t5gt9uw9yWJxedccNosf0+stJp7+zWSx5d8RVotL7z+wOHB67Jx1l91j/9w17B67bzaw efRtWcXo8XmTnMeh7W/YAtiiuGxSUnMyy1KL9O0SuDLO3upmKbh2krHiUs8q1gbG1csZuxg5 OCQETCTurNfqYuTiEBLYzSixYccv5i5GTqC4tMSxE2eYIWqEJQ4fLgYJCwl8YJQ41sYKEmYT 0Jb4s0UUJCwi4CjRu+swC8gYZoFdjBInTp8GGy8sECjx7BBYK4uAqsS26TvZQWxeARuJQ7M2 M0JskpdYveEA2FZOAVuJme9b2SBW2Ui8+veYbQIj3wJGhlWMkqkFxbnpucWGBYZ5qeV6xYm5 xaV56XrJ+bmbGMHhqKW5g/HykvhDjAIcjEo8vDfm8cQJsSaWFVfmHmKU4GBWEuEtD+SNE+JN SaysSi3Kjy8qzUktPsQozcGiJM77NO9YpJBAemJJanZqakFqEUyWiYNTqoGRi1/mv99BhaOr LRZu/3P0OVf+id1bDi0IWGPT4pRs82t/VhMr5+fWS8wf4173u30Iqnn1tslQqKqjbd2etVc9 jiSsPrb1rUlohEvSH4PNZ/nq/DP+bxMwUyw7HFwmmsth4Z1u5x3Z6lI2wdiU8dUWv5srt64Q f88x943sHId7vLJ3fEV93cWUWIozEg21mIuKEwE4eXXoQwIAAA== X-CMS-MailID: 20200102082400epcas1p4cd0ad14967bd8d231fc0efcede8bd99c X-Msg-Generator: CA X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20200102082400epcas1p4cd0ad14967bd8d231fc0efcede8bd99c References: <20200102082036.29643-1-namjae.jeon@samsung.com> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This adds in-memory and on-disk structures and headers. Signed-off-by: Namjae Jeon Signed-off-by: Sungjong Seo Reviewed-by: Christoph Hellwig --- fs/exfat/exfat_fs.h | 569 +++++++++++++++++++++++++++++++++++++++++++ fs/exfat/exfat_raw.h | 196 +++++++++++++++ 2 files changed, 765 insertions(+) create mode 100644 fs/exfat/exfat_fs.h create mode 100644 fs/exfat/exfat_raw.h diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h new file mode 100644 index 000000000000..9a8c26c758f8 --- /dev/null +++ b/fs/exfat/exfat_fs.h @@ -0,0 +1,569 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + */ + +#ifndef _EXFAT_H +#define _EXFAT_H + +#include +#include + +#define EXFAT_SUPER_MAGIC (0x2011BAB0UL) +#define EXFAT_ROOT_INO 1 + +#define EXFAT_SB_DIRTY 0 + +enum exfat_time_mode { + TM_CREATE, + TM_MODIFY, + TM_ACCESS, +}; + +/* + * exfat error flags + */ +enum exfat_error_mode { + EXFAT_ERRORS_CONT, /* ignore error and continue */ + EXFAT_ERRORS_PANIC, /* panic on error */ + EXFAT_ERRORS_RO, /* remount r/o on error */ +}; + +/* + * exfat nls lossy flag + */ +enum { + NLS_NAME_NO_LOSSY, /* no lossy */ + NLS_NAME_LOSSY, /* just detected incorrect filename(s) */ + NLS_NAME_OVERLEN, /* the length is over than its limit */ +}; + +/* + * exfat common MACRO + */ +#define CLUSTER_32(x) ((unsigned int)((x) & 0xFFFFFFFFU)) +#define EXFAT_EOF_CLUSTER CLUSTER_32(~0) +#define EXFAT_BAD_CLUSTER (0xFFFFFFF7U) +#define EXFAT_FREE_CLUSTER (0) +/* Cluster 0, 1 are reserved, the first cluster is 2 in the cluster heap. */ +#define EXFAT_RESERVED_CLUSTERS (2) +#define EXFAT_FIRST_CLUSTER (2) +#define EXFAT_DATA_CLUSTER_COUNT(sbi) \ + ((sbi)->num_clusters - EXFAT_RESERVED_CLUSTERS) + +#define EXFAT_HASH_BITS 8 +#define EXFAT_HASH_SIZE (1UL << EXFAT_HASH_BITS) + +/* + * Type Definitions + */ +#define ES_2_ENTRIES 2 +#define ES_ALL_ENTRIES 0 + +#define DIR_DELETED 0xFFFF0321 + +/* type values */ +#define TYPE_UNUSED 0x0000 +#define TYPE_DELETED 0x0001 +#define TYPE_INVALID 0x0002 +#define TYPE_CRITICAL_PRI 0x0100 +#define TYPE_BITMAP 0x0101 +#define TYPE_UPCASE 0x0102 +#define TYPE_VOLUME 0x0103 +#define TYPE_DIR 0x0104 +#define TYPE_FILE 0x011F +#define TYPE_CRITICAL_SEC 0x0200 +#define TYPE_STREAM 0x0201 +#define TYPE_EXTEND 0x0202 +#define TYPE_ACL 0x0203 +#define TYPE_BENIGN_PRI 0x0400 +#define TYPE_GUID 0x0401 +#define TYPE_PADDING 0x0402 +#define TYPE_ACLTAB 0x0403 +#define TYPE_BENIGN_SEC 0x0800 +#define TYPE_ALL 0x0FFF + +#define MAX_CHARSET_SIZE 6 /* max size of multi-byte character */ +#define MAX_NAME_LENGTH 255 /* max len of file name excluding NULL */ +#define MAX_VFSNAME_BUF_SIZE ((MAX_NAME_LENGTH + 1) * MAX_CHARSET_SIZE) + +#define FAT_CACHE_SIZE 128 +#define FAT_CACHE_HASH_SIZE 64 +#define BUF_CACHE_SIZE 256 +#define BUF_CACHE_HASH_SIZE 64 + +#define EXFAT_HINT_NONE -1 +#define EXFAT_MIN_SUBDIR 2 + +/* + * helpers for cluster size to byte conversion. + */ +#define EXFAT_CLU_TO_B(b, sbi) ((b) << (sbi)->cluster_size_bits) +#define EXFAT_B_TO_CLU(b, sbi) ((b) >> (sbi)->cluster_size_bits) +#define EXFAT_B_TO_CLU_ROUND_UP(b, sbi) \ + (((b - 1) >> (sbi)->cluster_size_bits) + 1) +#define EXFAT_CLU_OFFSET(off, sbi) ((off) & ((sbi)->cluster_size - 1)) + +/* + * helpers for block size to byte conversion. + */ +#define EXFAT_BLK_TO_B(b, sb) ((b) << (sb)->s_blocksize_bits) +#define EXFAT_B_TO_BLK(b, sb) ((b) >> (sb)->s_blocksize_bits) +#define EXFAT_B_TO_BLK_ROUND_UP(b, sb) \ + (((b - 1) >> (sb)->s_blocksize_bits) + 1) +#define EXFAT_BLK_OFFSET(off, sb) ((off) & ((sb)->s_blocksize - 1)) + +/* + * helpers for block size to dentry size conversion. + */ +#define EXFAT_B_TO_DEN_IDX(b, sbi) \ + ((b) << ((sbi)->cluster_size_bits - DENTRY_SIZE_BITS)) +#define EXFAT_B_TO_DEN(b) ((b) >> DENTRY_SIZE_BITS) +#define EXFAT_DEN_TO_B(b) ((b) << DENTRY_SIZE_BITS) + +/* + * helpers for fat entry. + */ +#define FAT_ENT_SIZE (4) +#define FAT_ENT_SIZE_BITS (2) +#define FAT_ENT_OFFSET_SECTOR(sb, loc) (EXFAT_SB(sb)->FAT1_start_sector + \ + (((u64)loc << FAT_ENT_SIZE_BITS) >> sb->s_blocksize_bits)) +#define FAT_ENT_OFFSET_BYTE_IN_SECTOR(sb, loc) \ + ((loc << FAT_ENT_SIZE_BITS) & (sb->s_blocksize - 1)) + +/* + * helpers for bitmap. + */ +#define CLUSTER_TO_BITMAP_ENT(clu) ((clu) - EXFAT_RESERVED_CLUSTERS) +#define BITMAP_ENT_TO_CLUSTER(ent) ((ent) + EXFAT_RESERVED_CLUSTERS) +#define BITS_PER_SECTOR(sb) ((sb)->s_blocksize * BITS_PER_BYTE) +#define BITS_PER_SECTOR_MASK(sb) (BITS_PER_SECTOR(sb) - 1) +#define BITMAP_OFFSET_SECTOR_INDEX(sb, ent) \ + ((ent / BITS_PER_BYTE) >> (sb)->s_blocksize_bits) +#define BITMAP_OFFSET_BIT_IN_SECTOR(sb, ent) (ent & BITS_PER_SECTOR_MASK(sb)) +#define BITMAP_OFFSET_BYTE_IN_SECTOR(sb, ent) \ + ((ent / BITS_PER_BYTE) & ((sb)->s_blocksize - 1)) +#define BITS_PER_BYTE_MASK (0x7) +#define IGNORED_BITS_REMAINED(clu, clu_base) ((1 << ((clu) - (clu_base))) - 1) + +union exfat_timezone { + struct { + __u8 off : 7; + __u8 valid : 1; + }; + __u8 value; +}; + +struct exfat_timestamp { + unsigned short sec; /* 0 ~ 59 */ + unsigned short min; /* 0 ~ 59 */ + unsigned short hour; /* 0 ~ 23 */ + unsigned short day; /* 1 ~ 31 */ + unsigned short mon; /* 1 ~ 12 */ + unsigned short year; /* 0 ~ 127 (since 1980) */ + union exfat_timezone tz; +}; + +struct exfat_date_time { + unsigned short year; + unsigned short month; + unsigned short day; + unsigned short hour; + unsigned short minute; + unsigned short second; + unsigned short milli_second; + union exfat_timezone timezone; +}; + +struct exfat_dentry_namebuf { + char *lfn; + int lfnbuf_len; /* usally MAX_UNINAME_BUF_SIZE */ +}; + +/* unicode name structure */ +struct exfat_uni_name { + /* +3 for null and for converting */ + unsigned short name[MAX_NAME_LENGTH + 3]; + unsigned short name_hash; + unsigned char name_len; +}; + +/* directory structure */ +struct exfat_chain { + unsigned int dir; + unsigned int size; + unsigned char flags; +}; + +/* first empty entry hint information */ +struct exfat_hint_femp { + /* entry index of a directory */ + int eidx; + /* count of continuous empty entry */ + int count; + /* the cluster that first empty slot exists in */ + struct exfat_chain cur; +}; + +/* hint structure */ +struct exfat_hint { + unsigned int clu; + union { + unsigned int off; /* cluster offset */ + int eidx; /* entry index */ + }; +}; + +struct exfat_entry_set_cache { + /* sector number that contains file_entry */ + sector_t sector; + /* byte offset in the sector */ + unsigned int offset; + /* flag in stream entry. 01 for cluster chain, 03 for contig. */ + int alloc_flag; + unsigned int num_entries; + struct exfat_dentry entries[]; +}; + +struct exfat_dir_entry { + struct exfat_chain dir; + int entry; + unsigned int type; + unsigned int start_clu; + unsigned char flags; + unsigned short attr; + loff_t size; + unsigned int num_subdirs; + struct exfat_date_time create_timestamp; + struct exfat_date_time modify_timestamp; + struct exfat_date_time access_timestamp; + struct exfat_dentry_namebuf namebuf; +}; + +/* + * exfat mount in-memory data + */ +struct exfat_mount_options { + kuid_t fs_uid; + kgid_t fs_gid; + unsigned short fs_fmask; + unsigned short fs_dmask; + /* permission for setting the [am]time */ + unsigned short allow_utime; + /* charset for filename input/display */ + char *iocharset; + unsigned char utf8; + unsigned char case_sensitive; + /* on error: continue, panic, remount-ro */ + enum exfat_error_mode errors; + /* flag on if -o dicard specified and device support discard() */ + unsigned char discard; +}; + +/* + * EXFAT file system superblock in-memory data + */ +struct exfat_sb_info { + unsigned int vol_type; /* volume FAT type */ + unsigned int vol_id; /* volume serial number */ + unsigned long long num_sectors; /* num of sectors in volume */ + unsigned int num_clusters; /* num of clusters in volume */ + unsigned int cluster_size; /* cluster size in bytes */ + unsigned int cluster_size_bits; + unsigned int sect_per_clus; /* cluster size in sectors */ + unsigned int sect_per_clus_bits; + unsigned long long FAT1_start_sector; /* FAT1 start sector */ + unsigned long long FAT2_start_sector; /* FAT2 start sector */ + unsigned long long root_start_sector; /* root dir start sector */ + unsigned long long data_start_sector; /* data area start sector */ + unsigned int num_FAT_sectors; /* num of FAT sectors */ + unsigned int root_dir; /* root dir cluster */ + unsigned int dentries_in_root; /* num of dentries in root dir */ + unsigned int dentries_per_clu; /* num of dentries per cluster */ + unsigned int vol_flag; /* volume dirty flag */ + struct buffer_head *pbr_bh; /* buffer_head of PBR sector */ + + unsigned int map_clu; /* allocation bitmap start cluster */ + unsigned int map_sectors; /* num of allocation bitmap sectors */ + struct buffer_head **vol_amap; /* allocation bitmap */ + + unsigned short *vol_utbl; /* upcase table */ + + unsigned int clu_srch_ptr; /* cluster search pointer */ + unsigned int used_clusters; /* number of used clusters */ + + unsigned long s_state; + struct mutex s_lock; /* superblock lock */ + struct super_block *host_sb; /* sb pointer */ + struct exfat_mount_options options; + struct nls_table *nls_io; /* Charset used for input and display */ + struct ratelimit_state ratelimit; + + spinlock_t inode_hash_lock; + struct hlist_head inode_hashtable[EXFAT_HASH_SIZE]; +}; + +/* + * EXFAT file system inode in-memory data + */ +struct exfat_inode_info { + struct exfat_chain dir; + int entry; + unsigned int type; + unsigned short attr; + unsigned int start_clu; + unsigned char flags; + /* + * the copy of low 32bit of i_version to check + * the validation of hint_stat. + */ + unsigned int version; + /* file offset or dentry index for readdir */ + loff_t rwoffset; + + /* hint for cluster last accessed */ + struct exfat_hint hint_bmap; + /* hint for entry index we try to lookup next time */ + struct exfat_hint hint_stat; + /* hint for first empty entry */ + struct exfat_hint_femp hint_femp; + + spinlock_t cache_lru_lock; + struct list_head cache_lru; + int nr_caches; + /* for avoiding the race between alloc and free */ + unsigned int cache_valid_id; + + /* + * NOTE: i_size_ondisk is 64bits, so must hold ->inode_lock to access. + * physically allocated size. + */ + loff_t i_size_ondisk; + /* block-aligned i_size (used in cont_write_begin) */ + loff_t i_size_aligned; + /* on-disk position of directory entry or 0 */ + loff_t i_pos; + /* hash by i_location */ + struct hlist_node i_hash_fat; + /* protect bmap against truncate */ + struct rw_semaphore truncate_lock; + struct inode vfs_inode; +}; + +static inline struct exfat_sb_info *EXFAT_SB(struct super_block *sb) +{ + return sb->s_fs_info; +} + +static inline struct exfat_inode_info *EXFAT_I(struct inode *inode) +{ + return container_of(inode, struct exfat_inode_info, vfs_inode); +} + +/* + * If ->i_mode can't hold 0222 (i.e. ATTR_RO), we use ->i_attrs to + * save ATTR_RO instead of ->i_mode. + * + * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only + * bit, it's just used as flag for app. + */ +static inline int exfat_mode_can_hold_ro(struct inode *inode) +{ + struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); + + if (S_ISDIR(inode->i_mode)) + return 0; + + if ((~sbi->options.fs_fmask) & 0222) + return 1; + return 0; +} + +/* Convert attribute bits and a mask to the UNIX mode. */ +static inline mode_t exfat_make_mode(struct exfat_sb_info *sbi, + unsigned short attr, mode_t mode) +{ + if ((attr & ATTR_READONLY) && !(attr & ATTR_SUBDIR)) + mode &= ~0222; + + if (attr & ATTR_SUBDIR) + return (mode & ~sbi->options.fs_dmask) | S_IFDIR; + + return (mode & ~sbi->options.fs_fmask) | S_IFREG; +} + +/* Return the FAT attribute byte for this inode */ +static inline unsigned short exfat_make_attr(struct inode *inode) +{ + unsigned short attr = EXFAT_I(inode)->attr; + + if (S_ISDIR(inode->i_mode)) + attr |= ATTR_SUBDIR; + if (exfat_mode_can_hold_ro(inode) && !(inode->i_mode & 0222)) + attr |= ATTR_READONLY; + return attr; +} + +static inline void exfat_save_attr(struct inode *inode, unsigned short attr) +{ + if (exfat_mode_can_hold_ro(inode)) + EXFAT_I(inode)->attr = attr & (ATTR_RWMASK | ATTR_READONLY); + else + EXFAT_I(inode)->attr = attr & ATTR_RWMASK; +} + +static inline bool exfat_is_last_sector_in_cluster(struct exfat_sb_info *sbi, + sector_t sec) +{ + return ((sec - sbi->data_start_sector + 1) & + ((1 << sbi->sect_per_clus_bits) - 1)) == 0; +} + +static inline sector_t exfat_cluster_to_sector(struct exfat_sb_info *sbi, + unsigned int clus) +{ + return ((clus - EXFAT_RESERVED_CLUSTERS) << sbi->sect_per_clus_bits) + + sbi->data_start_sector; +} + +static inline int exfat_sector_to_cluster(struct exfat_sb_info *sbi, + sector_t sec) +{ + return ((sec - sbi->data_start_sector) >> sbi->sect_per_clus_bits) + + EXFAT_RESERVED_CLUSTERS; +} + +/* super.c */ +int exfat_set_vol_flags(struct super_block *sb, unsigned short new_flag); + +/* fatent.c */ +#define exfat_get_next_cluster(sb, pclu) exfat_ent_get(sb, *(pclu), pclu) + +int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc, + struct exfat_chain *p_chain); +int exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain); +int exfat_ent_get(struct super_block *sb, unsigned int loc, + unsigned int *content); +int exfat_ent_set(struct super_block *sb, unsigned int loc, + unsigned int content); +int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir, + int entry, struct exfat_dentry *p_entry); +int exfat_chain_cont_cluster(struct super_block *sb, unsigned int chain, + unsigned int len); +int exfat_zeroed_cluster(struct inode *dir, unsigned int clu); +int exfat_find_last_cluster(struct super_block *sb, struct exfat_chain *p_chain, + unsigned int *ret_clu); +int exfat_count_num_clusters(struct super_block *sb, + struct exfat_chain *p_chain, unsigned int *ret_count); + +/* balloc.c */ +int exfat_load_bitmap(struct super_block *sb); +void exfat_free_bitmap(struct super_block *sb); +int exfat_set_bitmap(struct inode *inode, unsigned int clu); +void exfat_clear_bitmap(struct inode *inode, unsigned int clu); +unsigned int exfat_find_free_bitmap(struct super_block *sb, unsigned int clu); +int exfat_count_used_clusters(struct super_block *sb, unsigned int *ret_count); + +/* file.c */ +extern const struct file_operations exfat_file_operations; +int __exfat_truncate(struct inode *inode, loff_t new_size); +void exfat_truncate(struct inode *inode, loff_t size); +int exfat_setattr(struct dentry *dentry, struct iattr *attr); +int exfat_getattr(const struct path *path, struct kstat *stat, + unsigned int request_mask, unsigned int query_flags); + +/* namei.c */ +extern const struct dentry_operations exfat_dentry_ops; +extern const struct dentry_operations exfat_ci_dentry_ops; + +/* cache.c */ +int exfat_cache_init(void); +void exfat_cache_shutdown(void); +void exfat_cache_init_inode(struct inode *inode); +void exfat_cache_inval_inode(struct inode *inode); +int exfat_get_cluster(struct inode *inode, unsigned int cluster, + unsigned int *fclus, unsigned int *dclus, + unsigned int *last_dclus, int allow_eof); + +/* dir.c */ +extern const struct inode_operations exfat_dir_inode_operations; +extern const struct file_operations exfat_dir_operations; +unsigned int exfat_get_entry_type(struct exfat_dentry *p_entry); +void exfat_get_entry_time(struct exfat_dentry *p_entry, + struct exfat_timestamp *tp, unsigned char mode); +void exfat_set_entry_time(struct exfat_dentry *p_entry, + struct exfat_timestamp *tp, unsigned char mode); +int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir, + int entry, unsigned int type, unsigned int start_clu, + unsigned long long size); +int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir, + int entry, int num_entries, struct exfat_uni_name *p_uniname); +int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir, + int entry, int order, int num_entries); +int exfat_update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir, + int entry); +int exfat_update_dir_chksum_with_entry_set(struct super_block *sb, + struct exfat_entry_set_cache *es, int sync); +int exfat_calc_num_entries(struct exfat_uni_name *p_uniname); +int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei, + struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, + int num_entries, unsigned int type); +int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu); +int exfat_find_location(struct super_block *sb, struct exfat_chain *p_dir, + int entry, sector_t *sector, int *offset); +struct exfat_dentry *exfat_get_dentry(struct super_block *sb, + struct exfat_chain *p_dir, int entry, struct buffer_head **bh, + sector_t *sector); +struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb, + struct exfat_chain *p_dir, int entry, unsigned int type, + struct exfat_dentry **file_ep); +int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir); + +/* inode.c */ +extern const struct inode_operations exfat_file_inode_operations; +void exfat_sync_inode(struct inode *inode); +struct inode *exfat_build_inode(struct super_block *sb, + struct exfat_dir_entry *info, loff_t i_pos); +void exfat_hash_inode(struct inode *inode, loff_t i_pos); +void exfat_unhash_inode(struct inode *inode); +struct inode *exfat_iget(struct super_block *sb, loff_t i_pos); +int exfat_write_inode(struct inode *inode, struct writeback_control *wbc); +void exfat_evict_inode(struct inode *inode); +int exfat_block_truncate_page(struct inode *inode, loff_t from); + +/* exfat/nls.c */ +int exfat_nls_cmp_uniname(struct super_block *sb, unsigned short *a, + unsigned short *b); +int exfat_nls_uni16s_to_vfsname(struct super_block *sb, + struct exfat_uni_name *uniname, unsigned char *p_cstring, + int len); +int exfat_nls_vfsname_to_uni16s(struct super_block *sb, + const unsigned char *p_cstring, const int len, + struct exfat_uni_name *uniname, int *p_lossy); +int exfat_create_upcase_table(struct super_block *sb); +void exfat_free_upcase_table(struct super_block *sb); + +/* exfat/misc.c */ +void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...) + __printf(3, 4) __cold; +#define exfat_fs_error(sb, fmt, args...) \ + __exfat_fs_error(sb, 1, fmt, ## args) +#define exfat_fs_error_ratelimit(sb, fmt, args...) \ + __exfat_fs_error(sb, __ratelimit(&EXFAT_SB(sb)->ratelimit), \ + fmt, ## args) +void exfat_msg(struct super_block *sb, const char *lv, const char *fmt, ...) + __printf(3, 4) __cold; +void exfat_time_fat2unix(struct exfat_sb_info *sbi, struct timespec64 *ts, + struct exfat_date_time *tp); +void exfat_time_unix2fat(struct exfat_sb_info *sbi, struct timespec64 *ts, + struct exfat_date_time *tp); +struct exfat_timestamp *exfat_tm_now(struct exfat_sb_info *sbi, + struct exfat_timestamp *tm); +unsigned short exfat_calc_chksum_2byte(void *data, int len, + unsigned short chksum, int type); +void exfat_update_bh(struct super_block *sb, struct buffer_head *bh, int sync); +void exfat_chain_set(struct exfat_chain *ec, unsigned int dir, + unsigned int size, unsigned char flags); +void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec); + +#endif /* !_EXFAT_H */ diff --git a/fs/exfat/exfat_raw.h b/fs/exfat/exfat_raw.h new file mode 100644 index 000000000000..985889c37226 --- /dev/null +++ b/fs/exfat/exfat_raw.h @@ -0,0 +1,196 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + */ + +#ifndef _EXFAT_RAW_H +#define _EXFAT_RAW_H + +#include + +#define PBR_SIGNATURE 0xAA55 + +#define EXFAT_MAX_FILE_LEN 255 + +#define VOL_CLEAN 0x0000 +#define VOL_DIRTY 0x0002 + +/* AllocationPossible and NoFatChain field in GeneralSecondaryFlags Field */ +#define ALLOC_FAT_CHAIN 0x01 +#define ALLOC_NO_FAT_CHAIN 0x03 + +#define DENTRY_SIZE 32 /* directory entry size */ +#define DENTRY_SIZE_BITS 5 +/* exFAT allows 8388608(256MB) directory entries */ +#define MAX_EXFAT_DENTRIES 8388608 + +/* dentry types */ +#define EXFAT_UNUSED 0x00 /* end of directory */ +#define EXFAT_DELETE ~(0x80) +#define IS_EXFAT_DELETED(x) ((x) < 0x80) /* deleted file (0x01~0x7F) */ +#define EXFAT_INVAL 0x80 /* invalid value */ +#define EXFAT_BITMAP 0x81 /* allocation bitmap */ +#define EXFAT_UPCASE 0x82 /* upcase table */ +#define EXFAT_VOLUME 0x83 /* volume label */ +#define EXFAT_FILE 0x85 /* file or dir */ +#define EXFAT_GUID 0xA0 +#define EXFAT_PADDING 0xA1 +#define EXFAT_ACLTAB 0xA2 +#define EXFAT_STREAM 0xC0 /* stream entry */ +#define EXFAT_NAME 0xC1 /* file name entry */ +#define EXFAT_ACL 0xC2 /* stream entry */ + +#define IS_EXFAT_CRITICAL_PRI(x) (x < 0xA0) +#define IS_EXFAT_BENIGN_PRI(x) (x < 0xC0) +#define IS_EXFAT_CRITICAL_SEC(x) (x < 0xE0) + +/* checksum types */ +#define CS_DIR_ENTRY 0 +#define CS_PBR_SECTOR 1 +#define CS_DEFAULT 2 + +/* file attributes */ +#define ATTR_READONLY 0x0001 +#define ATTR_HIDDEN 0x0002 +#define ATTR_SYSTEM 0x0004 +#define ATTR_VOLUME 0x0008 +#define ATTR_SUBDIR 0x0010 +#define ATTR_ARCHIVE 0x0020 + +#define ATTR_RWMASK (ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME | \ + ATTR_SUBDIR | ATTR_ARCHIVE) + +#define JUMP_BOOT_LEN 3 +#define OEM_NAME_LEN 8 +#define MUST_BE_ZERO_LEN 53 +#define EXFAT_FILE_NAME_LEN 15 + +/* EXFAT BIOS parameter block (64 bytes) */ +struct bpb64 { + __u8 jmp_boot[JUMP_BOOT_LEN]; + __u8 oem_name[OEM_NAME_LEN]; + __u8 res_zero[MUST_BE_ZERO_LEN]; +}; + +/* EXFAT EXTEND BIOS parameter block (56 bytes) */ +struct bsx64 { + __le64 vol_offset; + __le64 vol_length; + __le32 fat_offset; + __le32 fat_length; + __le32 clu_offset; + __le32 clu_count; + __le32 root_cluster; + __le32 vol_serial; + __u8 fs_version[2]; + __le16 vol_flags; + __u8 sect_size_bits; + __u8 sect_per_clus_bits; + __u8 num_fats; + __u8 phy_drv_no; + __u8 perc_in_use; + __u8 reserved2[7]; +}; + +/* EXFAT PBR[BPB+BSX] (120 bytes) */ +struct pbr64 { + struct bpb64 bpb; + struct bsx64 bsx; +}; + +/* Common PBR[Partition Boot Record] (512 bytes) */ +struct pbr { + union { + __u8 raw[64]; + struct bpb64 f64; + } bpb; + union { + __u8 raw[56]; + struct bsx64 f64; + } bsx; + __u8 boot_code[390]; + __le16 signature; +}; + +struct exfat_dentry { + __u8 type; + union { + struct { + __u8 num_ext; + __le16 checksum; + __le16 attr; + __le16 reserved1; + __le16 create_time; + __le16 create_date; + __le16 modify_time; + __le16 modify_date; + __le16 access_time; + __le16 access_date; + __u8 create_time_ms; + __u8 modify_time_ms; + __u8 create_tz; + __u8 modify_tz; + __u8 access_tz; + __u8 reserved2[7]; + } __packed file; /* file directory entry */ + struct { + __u8 flags; + __u8 reserved1; + __u8 name_len; + __le16 name_hash; + __le16 reserved2; + __le64 valid_size; + __le32 reserved3; + __le32 start_clu; + __le64 size; + } __packed stream; /* stream extension directory entry */ + struct { + __u8 flags; + __le16 unicode_0_14[EXFAT_FILE_NAME_LEN]; + } __packed name; /* file name directory entry */ + struct { + __u8 flags; + __u8 reserved[18]; + __le32 start_clu; + __le64 size; + } __packed bitmap; /* allocation bitmap directory entry */ + struct { + __u8 reserved1[3]; + __le32 checksum; + __u8 reserved2[12]; + __le32 start_clu; + __le64 size; + } __packed upcase; /* up-case table directory entry */ + } __packed dentry; +} __packed; + +#define file_num_ext dentry.file.num_ext +#define file_checksum dentry.file.checksum +#define file_attr dentry.file.attr +#define file_create_time dentry.file.create_time +#define file_create_date dentry.file.create_date +#define file_modify_time dentry.file.modify_time +#define file_modify_date dentry.file.modify_date +#define file_access_time dentry.file.access_time +#define file_access_date dentry.file.access_date +#define file_create_time_ms dentry.file.create_time_ms +#define file_modify_time_ms dentry.file.modify_time_ms +#define file_create_tz dentry.file.create_tz +#define file_modify_tz dentry.file.modify_tz +#define file_access_tz dentry.file.access_tz +#define stream_flags dentry.stream.flags +#define stream_name_len dentry.stream.name_len +#define stream_name_hash dentry.stream.name_hash +#define stream_start_clu dentry.stream.start_clu +#define stream_valid_size dentry.stream.valid_size +#define stream_size dentry.stream.size +#define name_flags dentry.name.flags +#define name_unicode dentry.name.unicode_0_14 +#define bitmap_flags dentry.bitmap.flags +#define bitmap_start_clu dentry.bitmap.start_clu +#define bitmap_size dentry.bitmap.size +#define upcase_start_clu dentry.upcase.start_clu +#define upcase_size dentry.upcase.size +#define upcase_checksum dentry.upcase.checksum + +#endif /* !_EXFAT_RAW_H */