fsys_ext2fs.rar_grub

/* * GRUB -- GRand Unified Bootloader * * 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. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #ifdef FSYS_EXT2FS #include "shared.h" #include "filesys.h" static int mapblock1, mapblock2; /* sizes are always in bytes, BLOCK values are always in DEV_BSIZE (sectors) */ #define DEV_BSIZE 512 /* include/linux/fs.h */ #define BLOCK_SIZE 1024 /* initial block size for superblock read */ /* made up, defaults to 1 but can be passed via mount_opts */ #define WHICH_SUPER 1 /* kind of from fs/ext2/super.c */ #define SBLOCK (WHICH_SUPER * BLOCK_SIZE / DEV_BSIZE) /* = 2 */ /* include/asm-i386/types.h */ typedef __signed__ char __s8; typedef unsigned char __u8; typedef __signed__ short __s16; typedef unsigned short __u16; typedef __signed__ int __s32; typedef unsigned int __u32; /* * Constants relative to the data blocks, from ext2_fs.h */ #define EXT2_NDIR_BLOCKS 12 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) /* include/linux/ext2_fs.h */ struct ext2_super_block { __u32 s_inodes_count; /* Inodes count */ __u32 s_blocks_count; /* Blocks count */ __u32 s_r_blocks_count; /* Reserved blocks count */ __u32 s_free_blocks_count; /* Free blocks count */ __u32 s_free_inodes_count; /* Free inodes count */ __u32 s_first_data_block; /* First Data Block */ __u32 s_log_block_size; /* Block size */ __s32 s_log_frag_size; /* Fragment size */ __u32 s_blocks_per_group; /* # Blocks per group */ __u32 s_frags_per_group; /* # Fragments per group */ __u32 s_inodes_per_group; /* # Inodes per group */ __u32 s_mtime; /* Mount time */ __u32 s_wtime; /* Write time */ __u16 s_mnt_count; /* Mount count */ __s16 s_max_mnt_count; /* Maximal mount count */ __u16 s_magic; /* Magic signature */ __u16 s_state; /* File system state */ __u16 s_errors; /* Behaviour when detecting errors */ __u16 s_pad; __u32 s_lastcheck; /* time of last check */ __u32 s_checkinterval; /* max. time between checks */ __u32 s_creator_os; /* OS */ __u32 s_rev_level; /* Revision level */ __u16 s_def_resuid; /* Default uid for reserved blocks */ __u16 s_def_resgid; /* Default gid for reserved blocks */ __u32 s_reserved[235]; /* Padding to the end of the block */ }; struct ext2_group_desc { __u32 bg_block_bitmap; /* Blocks bitmap block */ __u32 bg_inode_bitmap; /* Inodes bitmap block */ __u32 bg_inode_table; /* Inodes table block */ __u16 bg_free_blocks_count; /* Free blocks count */ __u16 bg_free_inodes_count; /* Free inodes count */ __u16 bg_used_dirs_count; /* Directories count */ __u16 bg_pad; __u32 bg_reserved[3]; }; struct ext2_inode { __u16 i_mode; /* File mode */ __u16 i_uid; /* Owner Uid */ __u32 i_size; /* 4: Size in bytes */ __u32 i_atime; /* Access time */ __u32 i_ctime; /* 12: Creation time */ __u32 i_mtime; /* Modification time */ __u32 i_dtime; /* 20: Deletion Time */ __u16 i_gid; /* Group Id */ __u16 i_links_count; /* 24: Links count */ __u32 i_blocks; /* Blocks count */ __u32 i_flags; /* 32: File flags */ union { struct { __u32 l_i_reserved1; } linux1; struct { __u32 h_i_translator; } hurd1; struct { __u32 m_i_reserved1; } masix1; } osd1; /* OS dependent 1 */ __u32 i_block[EXT2_N_BLOCKS]; /* 40: Pointers to blocks */ __u32 i_version; /* File version (for NFS) */ __u32 i_file_acl; /* File ACL */ __u32 i_dir_acl; /* Directory ACL */ __u32 i_faddr; /* Fragment address */ union { struct { __u8 l_i_frag; /* Fragment number */ __u8 l_i_fsize; /* Fragment size */ __u16 i_pad1; __u32 l_i_reserved2[2]; } linux2; struct { __u8 h_i_frag; /* Fragment number */ __u8 h_i_fsize; /* Fragment size */ __u16 h_i_mode_high; __u16 h_i_uid_high; __u16 h_i_gid_high; __u32 h_i_author; } hurd2; struct { __u8 m_i_frag; /* Fragment number */ __u8 m_i_fsize; /* Fragment size */ __u16 m_pad1; __u32 m_i_reserved2[2]; } masix2; } osd2; /* OS dependent 2 */ }; /* linux/limits.h */ #define NAME_MAX 255 /* # chars in a file name */ /* linux/posix_type.h */ typedef long linux_off_t; /* linux/ext2fs.h */ #define EXT2_NAME_LEN 255 struct ext2_dir_entry { __u32 inode; /* Inode number */ __u16 rec_len; /* Directory entry length */ __u8 name_len; /* Name length */ __u8 file_type; char name[EXT2_NAME_LEN]; /* File name */ }; /* linux/ext2fs.h */ /* * EXT2_DIR_PAD defines the directory entries boundaries * * NOTE: It must be a multiple of 4 */ #define EXT2_DIR_PAD 4 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ ~EXT2_DIR_ROUND) /* ext2/super.c */ #define log2(n) ffz(~(n)) #define EXT2_SUPER_MAGIC 0xEF53 /* include/linux/ext2_fs.h */ #define EXT2_ROOT_INO 2 /* include/linux/ext2_fs.h */ #define PATH_MAX 1024 /* include/linux/limits.h */ #define MAX_LINK_COUNT 5 /* number of symbolic links to follow */ /* made up, these are pointers into FSYS_BUF */ /* read once, always stays there: */ #define SUPERBLOCK \ ((struct ext2_super_block *)(FSYS_BUF)) #define GROUP_DESC \ ((struct ext2_group_desc *) \ ((int)SUPERBLOCK + sizeof(struct ext2_super_block))) #define INODE \ ((struct ext2_inode *)((int)GROUP_DESC + EXT2_BLOCK_SIZE(SUPERBLOCK))) #define DATABLOCK1 \ ((int)((int)INODE + sizeof(struct ext2_inode))) #define DATABLOCK2 \ ((int)((int)DATABLOCK1 + EXT2_BLOCK_SIZE(SUPERBLOCK))) /* linux/ext2_fs.h */ #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) #define EXT2_ADDR_PER_BLOCK_BITS(s) (log2(EXT2_ADDR_PER_BLOCK(s))) /* linux/ext2_fs.h */ #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) /* kind of from ext2/super.c */ #define EXT2_BLOCK_SIZE(s) (1 << EXT2_BLOCK_SIZE_BITS(s)) /* linux/ext2fs.h */ #define EXT2_DESC_PER_BLOCK(s) \ (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) /* linux/stat.h */ #define S_IFMT 00170000 #define S_IFLNK 0120000 #define S_IFREG 0100000 #define S_IFDIR 0040000 #define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK) #define S_ISREG(m) (((m) & S_IFMT) == S_IFREG) #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR) /* include/asm-i386/bitops.h */ /* * ffz = Find First Zero in word. Undefined if no zero exists, * so code should check against ~0UL first.. */ static __inline__ unsigned long ffz (unsigned long word) { __asm__ ("bsfl %1,%0" : "=r" (word) : "r" (~word)); return word; } /* check filesystem types and read superblock into memory buffer */ int ext2fs_mount (void) { int retval = 1; if ((((current_drive & 0x80) || (current_slice != 0)) && (current_slice != PC_SLICE_TYPE_EXT2FS) && (current_slice != PC_SLICE_TYPE_LINUX_RAID) && (! IS_PC_SLICE_TYPE_BSD_WITH_FS (current_slice, FS_EXT2