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Fri, 10 Apr 2026 08:07:05 -0700 (PDT) Received: from corblimey.Home ([2a02:c7c:37d6:c100:60ca:408d:517a:4a96]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-488d67b4903sm28331225e9.5.2026.04.10.08.07.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Apr 2026 08:07:04 -0700 (PDT) From: Adrian McMenamin To: linux-fsdevel@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Adrian McMenamin Subject: [PATCH 09/10] Add support for VMUFAT filesystem Date: Fri, 10 Apr 2026 16:02:57 +0100 Message-ID: <20260410150256.308947-2-adrianmcmenamin@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit vmufat.h provides constants and common data structures to inode.c and super.c as well as a wrapper around calls to sb_read Signed-off-by: Adrian McMenamin fs/vmufat/vmufat.h | 126 ++++ --- --- /dev/null +++ b/fs/vmufat/vmufat.h @@ -0,0 +1,126 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* Header file for VMUFAT filesystem */ +#ifndef _VMUFAT_H_ +#define _VMUFAT_H_ + +/* maximum length of file name */ +#define VMUFAT_NAMELEN 12 + +/* Some GNU utils might not list files with inode num 0 */ +#define VMUFAT_ZEROBLOCK 0x10000 +#define VMU_BLK_SZ 0x200 +#define VMU_BLK_SZ16 0x100 +#define VMU_PHYS_SZ 0x100 + +/* file allocation table markers */ +#define VMUFAT_FILE_END 0xFFFA +#define VMUFAT_UNALLOCATED 0xFFFC +#define VMUFAT_ERROR 0xFFFF + +/* parameters for possible VMU volume sizes */ +#define VMUFAT_MIN_BLK 0x04 +#define VMUFAT_MAX_BLK 0x10000 + +/* specifcations for directory entries */ +#define VMU_DIR_RECORD_LEN 0x20 +#define VMU_DIR_RECORD_LEN16 0x10 +#define VMU_DIR_ENTRIES_PER_BLOCK 0x10 +#define VMUFAT_NAME_OFFSET 0x04 +#define VMUFAT_FIRSTBLOCK_OFFSET16 0x01 +#define VMUFAT_START_OFFSET16 0x01 +#define VMUFAT_SIZE_OFFSET16 0x0C +#define VMUFAT_HEADER_OFFSET16 0x0D + +/* File types used in directory */ +#define VMU_GAME 0xCC +#define VMU_DATA 0x33 + +/* filesystem locations marked in the root block */ +#define VMU_LOCATION_FAT 0x23 +#define VMU_LOCATION_FATLEN 0x24 +#define VMU_LOCATION_DIR 0x25 +#define VMU_LOCATION_DIRLEN 0x26 +#define VMU_LOCATION_USRLEN 0x28 /* set to 200 by real hardware */ + +/* date offsets */ +#define VMUFAT_SB_DATEOFFSET 0x30 +#define VMUFAT_FILE_DATEOFFSET 0x10 + +#define EXEC 0111 +#define NOCOPY 0xFF +#define CANCOPY 0x00 + +u16 vmufat_get_fat(struct super_block *sb, long block); +void vmufat_save_bcd(struct inode *in, char *bh, int index_to_dir); +struct inode *vmufat_get_inode(struct super_block *sb, long ino); +int vmufat_list_blocks(struct inode *in); + +enum vmufat_date { + VMUFAT_DIR_CENT = 0x10, + VMUFAT_DIR_YEAR, + VMUFAT_DIR_MONTH, + VMUFAT_DIR_DAY, + VMUFAT_DIR_HOUR, + VMUFAT_DIR_MIN, + VMUFAT_DIR_SEC, + VMUFAT_DIR_DOW +}; + +/* constants for BCD conversion */ +#define SECONDS_PER_DAY 86400 +#define DAYS_PER_YEAR 365 +#define SECONDS_PER_HOUR 3600 +#define HOURS_PER_DAY 24 +#define SIXTY_MINS_OR_SECS 60 +#define FEB28 59 +#define DAYS_PER_WEEK 7 +#define START_OF_EPOCH 70 +#define CENTURY21 30 +#define CENTURY22 130 + +struct memcard { + unsigned int sb_bnum; + unsigned int fat_bnum; + unsigned int fat_len; + unsigned int dir_bnum; + unsigned int dir_len; + unsigned int numblocks; + struct mutex mutex; +}; + +struct vmufat_block { + struct list_head b_list; + int bno; +}; + +struct vmufat_inode { + struct list_head blocks; + unsigned int nblcks; + enum vmufat_file_type { + GAME = 1, + DATA = 2 + } ft; + struct inode vfs_inode; +}; + +static inline struct vmufat_inode *VMUFAT_I(struct inode *in) +{ + return container_of(in, struct vmufat_inode, vfs_inode); +} + +struct vmufat_file_info { + u8 ftype; + int fblk; + char fname[VMUFAT_NAMELEN]; +}; + +static struct buffer_head *vmufat_sb_bread(struct super_block *sb, + sector_t block) +{ + if (!sb) + return NULL; + return sb_bread(sb, block); +} + +int vmufat_count_files(struct super_block *sb); +#endif