/* * (C) Copyright 2011 - 2012 Samsung Electronics * EXT4 filesystem implementation in Uboot by * Uma Shankar * Manjunatha C Achar * * Data structures and headers for ext4 support have been taken from * ext2 ls load support in Uboot * * (C) Copyright 2004 * esd gmbh * Reinhard Arlt * * based on code from grub2 fs/ext2.c and fs/fshelp.c by * GRUB -- GRand Unified Bootloader * Copyright (C) 2003, 2004 Free Software Foundation, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #ifndef __EXT_COMMON__ #define __EXT_COMMON__ #include #define SECTOR_SIZE 0x200 #define SECTOR_BITS 9 /* Amount of indirect blocks in an inode. */ #define INDIRECT_BLOCKS 12 /* Maximum length of a pathname. */ #define EXT2_PATH_MAX 4096 /* Maximum nesting of symlinks, used to prevent a loop. */ #define EXT2_MAX_SYMLINKCNT 8 /* Filetype used in directory entry. */ #define FILETYPE_UNKNOWN 0 #define FILETYPE_REG 1 #define FILETYPE_DIRECTORY 2 #define FILETYPE_SYMLINK 7 /* Filetype information as used in inodes. */ #define FILETYPE_INO_MASK 0170000 #define FILETYPE_INO_REG 0100000 #define FILETYPE_INO_DIRECTORY 0040000 #define FILETYPE_INO_SYMLINK 0120000 #define EXT2_ROOT_INO 2 /* Root inode */ /* Bits used as offset in sector */ #define DISK_SECTOR_BITS 9 /* The size of an ext2 block in bytes. */ #define EXT2_BLOCK_SIZE(data) (1 << LOG2_BLOCK_SIZE(data)) /* Log2 size of ext2 block in 512 blocks. */ #define LOG2_EXT2_BLOCK_SIZE(data) (le32_to_cpu \ (data->sblock.log2_block_size) + 1) /* Log2 size of ext2 block in bytes. */ #define LOG2_BLOCK_SIZE(data) (le32_to_cpu \ (data->sblock.log2_block_size) + 10) #define EXT2_FT_DIR 2 #define SUCCESS 1 /* Macro-instructions used to manage several block sizes */ #define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */ #define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */ #define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE) #define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE) /* The ext2 superblock. */ struct ext2_sblock { __le32 total_inodes; __le32 total_blocks; __le32 reserved_blocks; __le32 free_blocks; __le32 free_inodes; __le32 first_data_block; __le32 log2_block_size; __le32 log2_fragment_size; __le32 blocks_per_group; __le32 fragments_per_group; __le32 inodes_per_group; __le32 mtime; __le32 utime; __le16 mnt_count; __le16 max_mnt_count; __le16 magic; __le16 fs_state; __le16 error_handling; __le16 minor_revision_level; __le32 lastcheck; __le32 checkinterval; __le32 creator_os; __le32 revision_level; __le16 uid_reserved; __le16 gid_reserved; __le32 first_inode; __le16 inode_size; __le16 block_group_number; __le32 feature_compatibility; __le32 feature_incompat; __le32 feature_ro_compat; __le32 unique_id[4]; char volume_name[16]; char last_mounted_on[64]; __le32 compression_info; uint8_t prealloc_blocks; uint8_t prealloc_dir_blocks; __le16 reserved_gdt_blocks; uint8_t journal_uuid[16]; __le32 journal_inode; __le32 journal_dev; __le32 last_orphan; __le32 hash_seed[4]; uint8_t default_hash_version; uint8_t journal_backup_type; __le16 descriptor_size; __le32 default_mount_options; __le32 first_meta_block_group; __le32 mkfs_time; __le32 journal_blocks[17]; __le32 total_blocks_high; __le32 reserved_blocks_high; __le32 free_blocks_high; __le16 min_extra_inode_size; __le16 want_extra_inode_size; __le32 flags; __le16 raid_stride; __le16 mmp_interval; __le64 mmp_block; __le32 raid_stripe_width; uint8_t log2_groups_per_flex; uint8_t checksum_type; }; struct ext2_block_group { __le32 block_id; /* Blocks bitmap block */ __le32 inode_id; /* Inodes bitmap block */ __le32 inode_table_id; /* Inodes table block */ __le16 free_blocks; /* Free blocks count */ __le16 free_inodes; /* Free inodes count */ __le16 used_dir_cnt; /* Directories count */ __le16 bg_flags; __le32 bg_exclude_bitmap; __le16 bg_block_id_csum; __le16 bg_inode_id_csum; __le16 bg_itable_unused; /* Unused inodes count */ __le16 bg_checksum; /* crc16(s_uuid+group_num+group_desc)*/ /* following fields only exist if descriptor size is 64 */ __le32 block_id_high; __le32 inode_id_high; __le32 inode_table_id_high; __le16 free_blocks_high; __le16 free_inodes_high; __le16 used_dir_cnt_high; __le16 bg_itable_unused_high; __le32 bg_exclude_bitmap_high; __le16 bg_block_id_csum_high; __le16 bg_inode_id_csum_high; __le32 bg_reserved; }; /* The ext2 inode. */ struct ext2_inode { __le16 mode; __le16 uid; __le32 size; __le32 atime; __le32 ctime; __le32 mtime; __le32 dtime; __le16 gid; __le16 nlinks; __le32 blockcnt; /* Blocks of either 512 or block_size bytes */ __le32 flags; __le32 osd1; union { struct datablocks { __le32 dir_blocks[INDIRECT_BLOCKS]; __le32 indir_block; __le32 double_indir_block; __le32 triple_indir_block; } blocks; char symlink[60]; char inline_data[60]; } b; __le32 version; __le32 acl; __le32 size_high; /* previously dir_acl, but never used */ __le32 fragment_addr; __le32 osd2[3]; }; /* The header of an ext2 directory entry. */ struct ext2_dirent { __le32 inode; __le16 direntlen; __u8 namelen; __u8 filetype; }; struct ext2fs_node { struct inode i; struct ext2_data *data; struct ext2_inode inode; int ino; int inode_read; }; struct ext4fs_indir_block { int size; int blkno; uint32_t *data; }; /* Information about a "mounted" ext2 filesystem. */ struct ext2_data { struct ext2_sblock sblock; struct ext2_inode *inode; struct ext2fs_node diropen; struct ext_filesystem *fs; struct ext4fs_indir_block indir1, indir2, indir3; }; static inline loff_t ext4_isize(struct ext2fs_node *node) { if (S_ISREG(le16_to_cpu(node->inode.mode))) return ((loff_t)le32_to_cpu(node->inode.size_high) << 32) | le32_to_cpu(node->inode.size); return (loff_t) le32_to_cpu(node->inode.size); } #endif