mirror of
https://github.com/AsahiLinux/u-boot
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436da3cd23
This patch dramatically drops the amount of time u-boot needs to read a file from an ext2 partition. On a typical 2 to 5 MB file (kernels and initrds) it goes from tens of seconds to a couple seconds. All we are doing here is grouping contiguous blocks into one read. Boot tested on Globalscale Technologies Dreamplug (Kirkwood ARM SoC) with three different files. sha1sums were calculated in Linux userspace, and then confirmed after ext2load. Signed-off-by: Jason Cooper <u-boot@lakedaemon.net> Tested-by: Eric Nelson <eric.nelson@boundarydevices.com> Tested-by: Thierry Reding <thierry.reding@avionic-design.de>
919 lines
22 KiB
C
919 lines
22 KiB
C
/*
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* (C) Copyright 2004
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* esd gmbh <www.esd-electronics.com>
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* Reinhard Arlt <reinhard.arlt@esd-electronics.com>
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*
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* based on code from grub2 fs/ext2.c and fs/fshelp.c by
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*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <common.h>
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#include <ext2fs.h>
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#include <malloc.h>
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#include <asm/byteorder.h>
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extern int ext2fs_devread (int sector, int byte_offset, int byte_len,
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char *buf);
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/* Magic value used to identify an ext2 filesystem. */
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#define EXT2_MAGIC 0xEF53
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/* Amount of indirect blocks in an inode. */
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#define INDIRECT_BLOCKS 12
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/* Maximum lenght of a pathname. */
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#define EXT2_PATH_MAX 4096
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/* Maximum nesting of symlinks, used to prevent a loop. */
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#define EXT2_MAX_SYMLINKCNT 8
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/* Filetype used in directory entry. */
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#define FILETYPE_UNKNOWN 0
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#define FILETYPE_REG 1
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#define FILETYPE_DIRECTORY 2
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#define FILETYPE_SYMLINK 7
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/* Filetype information as used in inodes. */
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#define FILETYPE_INO_MASK 0170000
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#define FILETYPE_INO_REG 0100000
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#define FILETYPE_INO_DIRECTORY 0040000
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#define FILETYPE_INO_SYMLINK 0120000
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/* Bits used as offset in sector */
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#define DISK_SECTOR_BITS 9
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/* Log2 size of ext2 block in 512 blocks. */
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#define LOG2_EXT2_BLOCK_SIZE(data) (__le32_to_cpu (data->sblock.log2_block_size) + 1)
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/* Log2 size of ext2 block in bytes. */
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#define LOG2_BLOCK_SIZE(data) (__le32_to_cpu (data->sblock.log2_block_size) + 10)
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/* The size of an ext2 block in bytes. */
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#define EXT2_BLOCK_SIZE(data) (1 << LOG2_BLOCK_SIZE(data))
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/* The ext2 superblock. */
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struct ext2_sblock {
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uint32_t total_inodes;
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uint32_t total_blocks;
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uint32_t reserved_blocks;
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uint32_t free_blocks;
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uint32_t free_inodes;
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uint32_t first_data_block;
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uint32_t log2_block_size;
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uint32_t log2_fragment_size;
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uint32_t blocks_per_group;
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uint32_t fragments_per_group;
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uint32_t inodes_per_group;
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uint32_t mtime;
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uint32_t utime;
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uint16_t mnt_count;
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uint16_t max_mnt_count;
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uint16_t magic;
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uint16_t fs_state;
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uint16_t error_handling;
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uint16_t minor_revision_level;
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uint32_t lastcheck;
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uint32_t checkinterval;
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uint32_t creator_os;
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uint32_t revision_level;
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uint16_t uid_reserved;
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uint16_t gid_reserved;
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uint32_t first_inode;
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uint16_t inode_size;
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uint16_t block_group_number;
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uint32_t feature_compatibility;
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uint32_t feature_incompat;
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uint32_t feature_ro_compat;
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uint32_t unique_id[4];
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char volume_name[16];
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char last_mounted_on[64];
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uint32_t compression_info;
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};
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/* The ext2 blockgroup. */
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struct ext2_block_group {
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uint32_t block_id;
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uint32_t inode_id;
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uint32_t inode_table_id;
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uint16_t free_blocks;
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uint16_t free_inodes;
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uint16_t used_dir_cnt;
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uint32_t reserved[3];
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};
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/* The ext2 inode. */
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struct ext2_inode {
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uint16_t mode;
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uint16_t uid;
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uint32_t size;
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uint32_t atime;
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uint32_t ctime;
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uint32_t mtime;
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uint32_t dtime;
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uint16_t gid;
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uint16_t nlinks;
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uint32_t blockcnt; /* Blocks of 512 bytes!! */
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uint32_t flags;
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uint32_t osd1;
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union {
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struct datablocks {
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uint32_t dir_blocks[INDIRECT_BLOCKS];
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uint32_t indir_block;
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uint32_t double_indir_block;
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uint32_t tripple_indir_block;
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} blocks;
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char symlink[60];
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} b;
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uint32_t version;
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uint32_t acl;
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uint32_t dir_acl;
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uint32_t fragment_addr;
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uint32_t osd2[3];
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};
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/* The header of an ext2 directory entry. */
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struct ext2_dirent {
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uint32_t inode;
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uint16_t direntlen;
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uint8_t namelen;
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uint8_t filetype;
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};
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struct ext2fs_node {
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struct ext2_data *data;
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struct ext2_inode inode;
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int ino;
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int inode_read;
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};
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/* Information about a "mounted" ext2 filesystem. */
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struct ext2_data {
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struct ext2_sblock sblock;
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struct ext2_inode *inode;
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struct ext2fs_node diropen;
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};
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typedef struct ext2fs_node *ext2fs_node_t;
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struct ext2_data *ext2fs_root = NULL;
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ext2fs_node_t ext2fs_file = NULL;
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int symlinknest = 0;
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uint32_t *indir1_block = NULL;
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int indir1_size = 0;
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int indir1_blkno = -1;
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uint32_t *indir2_block = NULL;
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int indir2_size = 0;
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int indir2_blkno = -1;
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static unsigned int inode_size;
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static int ext2fs_blockgroup
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(struct ext2_data *data, int group, struct ext2_block_group *blkgrp) {
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unsigned int blkno;
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unsigned int blkoff;
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unsigned int desc_per_blk;
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desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group);
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blkno = __le32_to_cpu(data->sblock.first_data_block) + 1 +
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group / desc_per_blk;
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blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group);
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#ifdef DEBUG
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printf ("ext2fs read %d group descriptor (blkno %d blkoff %d)\n",
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group, blkno, blkoff);
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#endif
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return (ext2fs_devread (blkno << LOG2_EXT2_BLOCK_SIZE(data),
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blkoff, sizeof(struct ext2_block_group), (char *)blkgrp));
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}
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static int ext2fs_read_inode
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(struct ext2_data *data, int ino, struct ext2_inode *inode) {
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struct ext2_block_group blkgrp;
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struct ext2_sblock *sblock = &data->sblock;
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int inodes_per_block;
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int status;
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unsigned int blkno;
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unsigned int blkoff;
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#ifdef DEBUG
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printf ("ext2fs read inode %d, inode_size %d\n", ino, inode_size);
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#endif
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/* It is easier to calculate if the first inode is 0. */
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ino--;
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status = ext2fs_blockgroup (data, ino / __le32_to_cpu
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(sblock->inodes_per_group), &blkgrp);
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if (status == 0) {
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return (0);
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}
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inodes_per_block = EXT2_BLOCK_SIZE(data) / inode_size;
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blkno = __le32_to_cpu (blkgrp.inode_table_id) +
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(ino % __le32_to_cpu (sblock->inodes_per_group))
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/ inodes_per_block;
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blkoff = (ino % inodes_per_block) * inode_size;
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#ifdef DEBUG
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printf ("ext2fs read inode blkno %d blkoff %d\n", blkno, blkoff);
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#endif
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/* Read the inode. */
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status = ext2fs_devread (blkno << LOG2_EXT2_BLOCK_SIZE (data), blkoff,
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sizeof (struct ext2_inode), (char *) inode);
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if (status == 0) {
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return (0);
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}
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return (1);
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}
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void ext2fs_free_node (ext2fs_node_t node, ext2fs_node_t currroot) {
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if ((node != &ext2fs_root->diropen) && (node != currroot)) {
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free (node);
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}
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}
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static int ext2fs_read_block (ext2fs_node_t node, int fileblock) {
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struct ext2_data *data = node->data;
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struct ext2_inode *inode = &node->inode;
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int blknr;
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int blksz = EXT2_BLOCK_SIZE (data);
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int log2_blksz = LOG2_EXT2_BLOCK_SIZE (data);
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int status;
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/* Direct blocks. */
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if (fileblock < INDIRECT_BLOCKS) {
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blknr = __le32_to_cpu (inode->b.blocks.dir_blocks[fileblock]);
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}
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/* Indirect. */
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else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
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if (indir1_block == NULL) {
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indir1_block = (uint32_t *) memalign(ARCH_DMA_MINALIGN,
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blksz);
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if (indir1_block == NULL) {
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printf ("** ext2fs read block (indir 1) malloc failed. **\n");
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return (-1);
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}
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indir1_size = blksz;
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indir1_blkno = -1;
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}
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if (blksz != indir1_size) {
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free (indir1_block);
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indir1_block = NULL;
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indir1_size = 0;
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indir1_blkno = -1;
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indir1_block = (uint32_t *) memalign(ARCH_DMA_MINALIGN,
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blksz);
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if (indir1_block == NULL) {
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printf ("** ext2fs read block (indir 1) malloc failed. **\n");
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return (-1);
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}
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indir1_size = blksz;
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}
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if ((__le32_to_cpu (inode->b.blocks.indir_block) <<
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log2_blksz) != indir1_blkno) {
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status = ext2fs_devread (__le32_to_cpu(inode->b.blocks.indir_block) << log2_blksz,
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0, blksz,
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(char *) indir1_block);
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if (status == 0) {
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printf ("** ext2fs read block (indir 1) failed. **\n");
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return (0);
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}
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indir1_blkno =
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__le32_to_cpu (inode->b.blocks.
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indir_block) << log2_blksz;
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}
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blknr = __le32_to_cpu (indir1_block
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[fileblock - INDIRECT_BLOCKS]);
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}
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/* Double indirect. */
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else if (fileblock <
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(INDIRECT_BLOCKS + (blksz / 4 * (blksz / 4 + 1)))) {
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unsigned int perblock = blksz / 4;
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unsigned int rblock = fileblock - (INDIRECT_BLOCKS
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+ blksz / 4);
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if (indir1_block == NULL) {
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indir1_block = (uint32_t *) memalign(ARCH_DMA_MINALIGN,
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blksz);
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if (indir1_block == NULL) {
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printf ("** ext2fs read block (indir 2 1) malloc failed. **\n");
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return (-1);
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}
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indir1_size = blksz;
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indir1_blkno = -1;
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}
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if (blksz != indir1_size) {
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free (indir1_block);
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indir1_block = NULL;
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indir1_size = 0;
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indir1_blkno = -1;
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indir1_block = (uint32_t *) memalign(ARCH_DMA_MINALIGN,
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blksz);
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if (indir1_block == NULL) {
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printf ("** ext2fs read block (indir 2 1) malloc failed. **\n");
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return (-1);
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}
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indir1_size = blksz;
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}
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if ((__le32_to_cpu (inode->b.blocks.double_indir_block) <<
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log2_blksz) != indir1_blkno) {
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status = ext2fs_devread (__le32_to_cpu(inode->b.blocks.double_indir_block) << log2_blksz,
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0, blksz,
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(char *) indir1_block);
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if (status == 0) {
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printf ("** ext2fs read block (indir 2 1) failed. **\n");
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return (-1);
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}
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indir1_blkno =
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__le32_to_cpu (inode->b.blocks.double_indir_block) << log2_blksz;
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}
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if (indir2_block == NULL) {
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indir2_block = (uint32_t *) memalign(ARCH_DMA_MINALIGN,
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blksz);
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if (indir2_block == NULL) {
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printf ("** ext2fs read block (indir 2 2) malloc failed. **\n");
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return (-1);
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}
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indir2_size = blksz;
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indir2_blkno = -1;
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}
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if (blksz != indir2_size) {
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free (indir2_block);
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indir2_block = NULL;
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indir2_size = 0;
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indir2_blkno = -1;
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indir2_block = (uint32_t *) memalign(ARCH_DMA_MINALIGN,
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blksz);
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if (indir2_block == NULL) {
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printf ("** ext2fs read block (indir 2 2) malloc failed. **\n");
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return (-1);
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}
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indir2_size = blksz;
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}
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if ((__le32_to_cpu (indir1_block[rblock / perblock]) <<
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log2_blksz) != indir2_blkno) {
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status = ext2fs_devread (__le32_to_cpu(indir1_block[rblock / perblock]) << log2_blksz,
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0, blksz,
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(char *) indir2_block);
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if (status == 0) {
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printf ("** ext2fs read block (indir 2 2) failed. **\n");
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return (-1);
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}
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indir2_blkno =
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__le32_to_cpu (indir1_block[rblock / perblock]) << log2_blksz;
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}
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blknr = __le32_to_cpu (indir2_block[rblock % perblock]);
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}
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/* Tripple indirect. */
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else {
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printf ("** ext2fs doesn't support tripple indirect blocks. **\n");
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return (-1);
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}
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#ifdef DEBUG
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printf ("ext2fs_read_block %08x\n", blknr);
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#endif
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return (blknr);
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}
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int ext2fs_read_file
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(ext2fs_node_t node, int pos, unsigned int len, char *buf) {
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int i;
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int blockcnt;
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int log2blocksize = LOG2_EXT2_BLOCK_SIZE (node->data);
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int blocksize = 1 << (log2blocksize + DISK_SECTOR_BITS);
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unsigned int filesize = __le32_to_cpu(node->inode.size);
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/* Adjust len so it we can't read past the end of the file. */
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if (len > filesize) {
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len = filesize;
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}
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blockcnt = ((len + pos) + blocksize - 1) / blocksize;
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for (i = pos / blocksize; i < blockcnt; i++) {
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int blknr;
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int blockoff = pos % blocksize;
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int blockend = blocksize;
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int skipfirst = 0;
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blknr = ext2fs_read_block (node, i);
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if (blknr < 0) {
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return (-1);
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}
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/* Last block. */
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if (i == blockcnt - 1) {
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blockend = (len + pos) % blocksize;
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/* The last portion is exactly blocksize. */
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if (!blockend) {
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blockend = blocksize;
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}
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}
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/* First block. */
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if (i == pos / blocksize) {
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skipfirst = blockoff;
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blockend -= skipfirst;
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}
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/* grab middle blocks in one go */
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if (i != pos / blocksize && i != blockcnt - 1 && blockcnt > 3) {
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int oldblk = blknr;
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int blocknxt;
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while (i < blockcnt - 1) {
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blocknxt = ext2fs_read_block(node, i + 1);
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if (blocknxt == (oldblk + 1)) {
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oldblk = blocknxt;
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i++;
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} else {
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blocknxt = ext2fs_read_block(node, i);
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break;
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}
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}
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if (oldblk == blknr)
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blockend = blocksize;
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else
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blockend = (1 + blocknxt - blknr) * blocksize;
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}
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blknr = blknr << log2blocksize;
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/* If the block number is 0 this block is not stored on disk but
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is zero filled instead. */
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if (blknr) {
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int status;
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status = ext2fs_devread (blknr, skipfirst, blockend, buf);
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if (status == 0) {
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return (-1);
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}
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} else {
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memset (buf, 0, blocksize - skipfirst);
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}
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buf += blockend - skipfirst;
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}
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return (len);
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}
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static int ext2fs_iterate_dir (ext2fs_node_t dir, char *name, ext2fs_node_t * fnode, int *ftype)
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{
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unsigned int fpos = 0;
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int status;
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struct ext2fs_node *diro = (struct ext2fs_node *) dir;
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#ifdef DEBUG
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if (name != NULL)
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printf ("Iterate dir %s\n", name);
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#endif /* of DEBUG */
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if (!diro->inode_read) {
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status = ext2fs_read_inode (diro->data, diro->ino,
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&diro->inode);
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if (status == 0) {
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return (0);
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}
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}
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/* Search the file. */
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while (fpos < __le32_to_cpu (diro->inode.size)) {
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struct ext2_dirent dirent;
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status = ext2fs_read_file (diro, fpos,
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sizeof (struct ext2_dirent),
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(char *) &dirent);
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if (status < 1) {
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return (0);
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}
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if (dirent.namelen != 0) {
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char filename[dirent.namelen + 1];
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ext2fs_node_t fdiro;
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int type = FILETYPE_UNKNOWN;
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status = ext2fs_read_file (diro,
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fpos + sizeof (struct ext2_dirent),
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dirent.namelen, filename);
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if (status < 1) {
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return (0);
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}
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fdiro = malloc (sizeof (struct ext2fs_node));
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if (!fdiro) {
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return (0);
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}
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fdiro->data = diro->data;
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fdiro->ino = __le32_to_cpu (dirent.inode);
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filename[dirent.namelen] = '\0';
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if (dirent.filetype != FILETYPE_UNKNOWN) {
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fdiro->inode_read = 0;
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if (dirent.filetype == FILETYPE_DIRECTORY) {
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type = FILETYPE_DIRECTORY;
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} else if (dirent.filetype ==
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FILETYPE_SYMLINK) {
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type = FILETYPE_SYMLINK;
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} else if (dirent.filetype == FILETYPE_REG) {
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type = FILETYPE_REG;
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}
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} else {
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/* The filetype can not be read from the dirent, get it from inode */
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status = ext2fs_read_inode (diro->data,
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__le32_to_cpu(dirent.inode),
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&fdiro->inode);
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if (status == 0) {
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free (fdiro);
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return (0);
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}
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fdiro->inode_read = 1;
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if ((__le16_to_cpu (fdiro->inode.mode) &
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FILETYPE_INO_MASK) ==
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FILETYPE_INO_DIRECTORY) {
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type = FILETYPE_DIRECTORY;
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} else if ((__le16_to_cpu (fdiro->inode.mode)
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& FILETYPE_INO_MASK) ==
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FILETYPE_INO_SYMLINK) {
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type = FILETYPE_SYMLINK;
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} else if ((__le16_to_cpu (fdiro->inode.mode)
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& FILETYPE_INO_MASK) ==
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FILETYPE_INO_REG) {
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type = FILETYPE_REG;
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}
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}
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#ifdef DEBUG
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printf ("iterate >%s<\n", filename);
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#endif /* of DEBUG */
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if ((name != NULL) && (fnode != NULL)
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&& (ftype != NULL)) {
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if (strcmp (filename, name) == 0) {
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*ftype = type;
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*fnode = fdiro;
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return (1);
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}
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} else {
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if (fdiro->inode_read == 0) {
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status = ext2fs_read_inode (diro->data,
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__le32_to_cpu (dirent.inode),
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&fdiro->inode);
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if (status == 0) {
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free (fdiro);
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return (0);
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}
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fdiro->inode_read = 1;
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}
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switch (type) {
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case FILETYPE_DIRECTORY:
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printf ("<DIR> ");
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break;
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case FILETYPE_SYMLINK:
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printf ("<SYM> ");
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break;
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case FILETYPE_REG:
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printf (" ");
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break;
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default:
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printf ("< ? > ");
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break;
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}
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printf ("%10d %s\n",
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__le32_to_cpu (fdiro->inode.size),
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filename);
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}
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free (fdiro);
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}
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fpos += __le16_to_cpu (dirent.direntlen);
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}
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return (0);
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}
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static char *ext2fs_read_symlink (ext2fs_node_t node) {
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char *symlink;
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struct ext2fs_node *diro = node;
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int status;
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if (!diro->inode_read) {
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status = ext2fs_read_inode (diro->data, diro->ino,
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&diro->inode);
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if (status == 0) {
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return (0);
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}
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}
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symlink = malloc (__le32_to_cpu (diro->inode.size) + 1);
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if (!symlink) {
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return (0);
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}
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/* If the filesize of the symlink is bigger than
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60 the symlink is stored in a separate block,
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otherwise it is stored in the inode. */
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if (__le32_to_cpu (diro->inode.size) <= 60) {
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strncpy (symlink, diro->inode.b.symlink,
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__le32_to_cpu (diro->inode.size));
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} else {
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status = ext2fs_read_file (diro, 0,
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__le32_to_cpu (diro->inode.size),
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symlink);
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if (status == 0) {
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free (symlink);
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return (0);
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}
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}
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symlink[__le32_to_cpu (diro->inode.size)] = '\0';
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return (symlink);
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}
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int ext2fs_find_file1
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(const char *currpath,
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ext2fs_node_t currroot, ext2fs_node_t * currfound, int *foundtype) {
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char fpath[strlen (currpath) + 1];
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char *name = fpath;
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char *next;
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int status;
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int type = FILETYPE_DIRECTORY;
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ext2fs_node_t currnode = currroot;
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ext2fs_node_t oldnode = currroot;
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strncpy (fpath, currpath, strlen (currpath) + 1);
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/* Remove all leading slashes. */
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while (*name == '/') {
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name++;
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}
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if (!*name) {
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*currfound = currnode;
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return (1);
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}
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for (;;) {
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int found;
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/* Extract the actual part from the pathname. */
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next = strchr (name, '/');
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if (next) {
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/* Remove all leading slashes. */
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while (*next == '/') {
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*(next++) = '\0';
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}
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}
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/* At this point it is expected that the current node is a directory, check if this is true. */
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if (type != FILETYPE_DIRECTORY) {
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ext2fs_free_node (currnode, currroot);
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return (0);
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}
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oldnode = currnode;
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/* Iterate over the directory. */
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found = ext2fs_iterate_dir (currnode, name, &currnode, &type);
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if (found == 0) {
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return (0);
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}
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if (found == -1) {
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break;
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}
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/* Read in the symlink and follow it. */
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if (type == FILETYPE_SYMLINK) {
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char *symlink;
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/* Test if the symlink does not loop. */
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if (++symlinknest == 8) {
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ext2fs_free_node (currnode, currroot);
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ext2fs_free_node (oldnode, currroot);
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return (0);
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}
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symlink = ext2fs_read_symlink (currnode);
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ext2fs_free_node (currnode, currroot);
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if (!symlink) {
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ext2fs_free_node (oldnode, currroot);
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return (0);
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}
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#ifdef DEBUG
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printf ("Got symlink >%s<\n", symlink);
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#endif /* of DEBUG */
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/* The symlink is an absolute path, go back to the root inode. */
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if (symlink[0] == '/') {
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ext2fs_free_node (oldnode, currroot);
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oldnode = &ext2fs_root->diropen;
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}
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/* Lookup the node the symlink points to. */
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status = ext2fs_find_file1 (symlink, oldnode,
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&currnode, &type);
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free (symlink);
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if (status == 0) {
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ext2fs_free_node (oldnode, currroot);
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return (0);
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}
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}
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|
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ext2fs_free_node (oldnode, currroot);
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|
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/* Found the node! */
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if (!next || *next == '\0') {
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*currfound = currnode;
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*foundtype = type;
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return (1);
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}
|
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name = next;
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}
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return (-1);
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}
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|
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int ext2fs_find_file
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(const char *path,
|
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ext2fs_node_t rootnode, ext2fs_node_t * foundnode, int expecttype) {
|
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int status;
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int foundtype = FILETYPE_DIRECTORY;
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|
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|
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symlinknest = 0;
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if (!path) {
|
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return (0);
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}
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|
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status = ext2fs_find_file1 (path, rootnode, foundnode, &foundtype);
|
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if (status == 0) {
|
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return (0);
|
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}
|
|
/* Check if the node that was found was of the expected type. */
|
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if ((expecttype == FILETYPE_REG) && (foundtype != expecttype)) {
|
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return (0);
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} else if ((expecttype == FILETYPE_DIRECTORY)
|
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&& (foundtype != expecttype)) {
|
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return (0);
|
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}
|
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return (1);
|
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}
|
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|
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|
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int ext2fs_ls (const char *dirname) {
|
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ext2fs_node_t dirnode;
|
|
int status;
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|
|
if (ext2fs_root == NULL) {
|
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return (0);
|
|
}
|
|
|
|
status = ext2fs_find_file (dirname, &ext2fs_root->diropen, &dirnode,
|
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FILETYPE_DIRECTORY);
|
|
if (status != 1) {
|
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printf ("** Can not find directory. **\n");
|
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return (1);
|
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}
|
|
ext2fs_iterate_dir (dirnode, NULL, NULL, NULL);
|
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ext2fs_free_node (dirnode, &ext2fs_root->diropen);
|
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return (0);
|
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}
|
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|
|
|
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int ext2fs_open (const char *filename) {
|
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ext2fs_node_t fdiro = NULL;
|
|
int status;
|
|
int len;
|
|
|
|
if (ext2fs_root == NULL) {
|
|
return (-1);
|
|
}
|
|
ext2fs_file = NULL;
|
|
status = ext2fs_find_file (filename, &ext2fs_root->diropen, &fdiro,
|
|
FILETYPE_REG);
|
|
if (status == 0) {
|
|
goto fail;
|
|
}
|
|
if (!fdiro->inode_read) {
|
|
status = ext2fs_read_inode (fdiro->data, fdiro->ino,
|
|
&fdiro->inode);
|
|
if (status == 0) {
|
|
goto fail;
|
|
}
|
|
}
|
|
len = __le32_to_cpu (fdiro->inode.size);
|
|
ext2fs_file = fdiro;
|
|
return (len);
|
|
|
|
fail:
|
|
ext2fs_free_node (fdiro, &ext2fs_root->diropen);
|
|
return (-1);
|
|
}
|
|
|
|
|
|
int ext2fs_close (void
|
|
) {
|
|
if ((ext2fs_file != NULL) && (ext2fs_root != NULL)) {
|
|
ext2fs_free_node (ext2fs_file, &ext2fs_root->diropen);
|
|
ext2fs_file = NULL;
|
|
}
|
|
if (ext2fs_root != NULL) {
|
|
free (ext2fs_root);
|
|
ext2fs_root = NULL;
|
|
}
|
|
if (indir1_block != NULL) {
|
|
free (indir1_block);
|
|
indir1_block = NULL;
|
|
indir1_size = 0;
|
|
indir1_blkno = -1;
|
|
}
|
|
if (indir2_block != NULL) {
|
|
free (indir2_block);
|
|
indir2_block = NULL;
|
|
indir2_size = 0;
|
|
indir2_blkno = -1;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
|
|
int ext2fs_read (char *buf, unsigned len) {
|
|
int status;
|
|
|
|
if (ext2fs_root == NULL) {
|
|
return (0);
|
|
}
|
|
|
|
if (ext2fs_file == NULL) {
|
|
return (0);
|
|
}
|
|
|
|
status = ext2fs_read_file (ext2fs_file, 0, len, buf);
|
|
return (status);
|
|
}
|
|
|
|
|
|
int ext2fs_mount (unsigned part_length) {
|
|
struct ext2_data *data;
|
|
int status;
|
|
|
|
data = malloc (sizeof (struct ext2_data));
|
|
if (!data) {
|
|
return (0);
|
|
}
|
|
/* Read the superblock. */
|
|
status = ext2fs_devread (1 * 2, 0, sizeof (struct ext2_sblock),
|
|
(char *) &data->sblock);
|
|
if (status == 0) {
|
|
goto fail;
|
|
}
|
|
/* Make sure this is an ext2 filesystem. */
|
|
if (__le16_to_cpu (data->sblock.magic) != EXT2_MAGIC) {
|
|
goto fail;
|
|
}
|
|
if (__le32_to_cpu(data->sblock.revision_level == 0)) {
|
|
inode_size = 128;
|
|
} else {
|
|
inode_size = __le16_to_cpu(data->sblock.inode_size);
|
|
}
|
|
#ifdef DEBUG
|
|
printf("EXT2 rev %d, inode_size %d\n",
|
|
__le32_to_cpu(data->sblock.revision_level), inode_size);
|
|
#endif
|
|
data->diropen.data = data;
|
|
data->diropen.ino = 2;
|
|
data->diropen.inode_read = 1;
|
|
data->inode = &data->diropen.inode;
|
|
|
|
status = ext2fs_read_inode (data, 2, data->inode);
|
|
if (status == 0) {
|
|
goto fail;
|
|
}
|
|
|
|
ext2fs_root = data;
|
|
|
|
return (1);
|
|
|
|
fail:
|
|
printf ("Failed to mount ext2 filesystem...\n");
|
|
free (data);
|
|
ext2fs_root = NULL;
|
|
return (0);
|
|
}
|