488 lines
18 KiB
C
488 lines
18 KiB
C
/*
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* swapfs.c --- swap ext2 filesystem data structures
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*
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* Copyright (C) 1995, 1996, 2002 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Library
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* General Public License, version 2.
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* %End-Header%
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*/
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#include "config.h"
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#include <stdio.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <string.h>
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#include <time.h>
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#include "ext2_fs.h"
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#include "ext2fs.h"
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#include "ext2fsP.h"
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#include <ext2fs/ext2_ext_attr.h>
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void ext2fs_swap_super(struct ext2_super_block * sb)
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{
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int i;
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sb->s_inodes_count = ext2fs_swab32(sb->s_inodes_count);
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sb->s_blocks_count = ext2fs_swab32(sb->s_blocks_count);
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sb->s_r_blocks_count = ext2fs_swab32(sb->s_r_blocks_count);
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sb->s_free_blocks_count = ext2fs_swab32(sb->s_free_blocks_count);
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sb->s_free_inodes_count = ext2fs_swab32(sb->s_free_inodes_count);
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sb->s_first_data_block = ext2fs_swab32(sb->s_first_data_block);
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sb->s_log_block_size = ext2fs_swab32(sb->s_log_block_size);
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sb->s_log_cluster_size = ext2fs_swab32(sb->s_log_cluster_size);
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sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group);
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sb->s_clusters_per_group = ext2fs_swab32(sb->s_clusters_per_group);
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sb->s_inodes_per_group = ext2fs_swab32(sb->s_inodes_per_group);
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sb->s_mtime = ext2fs_swab32(sb->s_mtime);
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sb->s_wtime = ext2fs_swab32(sb->s_wtime);
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sb->s_mnt_count = ext2fs_swab16(sb->s_mnt_count);
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sb->s_max_mnt_count = ext2fs_swab16(sb->s_max_mnt_count);
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sb->s_magic = ext2fs_swab16(sb->s_magic);
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sb->s_state = ext2fs_swab16(sb->s_state);
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sb->s_errors = ext2fs_swab16(sb->s_errors);
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sb->s_minor_rev_level = ext2fs_swab16(sb->s_minor_rev_level);
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sb->s_lastcheck = ext2fs_swab32(sb->s_lastcheck);
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sb->s_checkinterval = ext2fs_swab32(sb->s_checkinterval);
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sb->s_creator_os = ext2fs_swab32(sb->s_creator_os);
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sb->s_rev_level = ext2fs_swab32(sb->s_rev_level);
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sb->s_def_resuid = ext2fs_swab16(sb->s_def_resuid);
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sb->s_def_resgid = ext2fs_swab16(sb->s_def_resgid);
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sb->s_first_ino = ext2fs_swab32(sb->s_first_ino);
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sb->s_inode_size = ext2fs_swab16(sb->s_inode_size);
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sb->s_block_group_nr = ext2fs_swab16(sb->s_block_group_nr);
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sb->s_feature_compat = ext2fs_swab32(sb->s_feature_compat);
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sb->s_feature_incompat = ext2fs_swab32(sb->s_feature_incompat);
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sb->s_feature_ro_compat = ext2fs_swab32(sb->s_feature_ro_compat);
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/* sb->s_uuid is __u8 and does not need swabbing */
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/* sb->s_volume_name is char and does not need swabbing */
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/* sb->s_last_mounted is char and does not need swabbing */
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sb->s_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap);
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/* sb->s_prealloc_blocks is __u8 and does not need swabbing */
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/* sb->s_prealloc_dir_blocks is __u8 and does not need swabbing */
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sb->s_reserved_gdt_blocks = ext2fs_swab16(sb->s_reserved_gdt_blocks);
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/* sb->s_journal_uuid is __u8 and does not need swabbing */
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sb->s_journal_inum = ext2fs_swab32(sb->s_journal_inum);
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sb->s_journal_dev = ext2fs_swab32(sb->s_journal_dev);
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sb->s_last_orphan = ext2fs_swab32(sb->s_last_orphan);
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for (i = 0; i < 4; i++)
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sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]);
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/* sb->s_def_hash_version is __u8 and does not need swabbing */
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/* sb->s_jnl_backup_type is __u8 and does not need swabbing */
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sb->s_desc_size = ext2fs_swab16(sb->s_desc_size);
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sb->s_default_mount_opts = ext2fs_swab32(sb->s_default_mount_opts);
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sb->s_first_meta_bg = ext2fs_swab32(sb->s_first_meta_bg);
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sb->s_mkfs_time = ext2fs_swab32(sb->s_mkfs_time);
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/* if journal backup is for a valid extent-based journal... */
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if (ext2fs_extent_header_verify(sb->s_jnl_blocks,
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sizeof(sb->s_jnl_blocks)) == 0) {
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/* ... swap only the journal i_size and i_size_high,
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* and the extent data is not swapped on read */
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i = 15;
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} else {
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/* direct/indirect journal: swap it all */
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i = 0;
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}
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for (; i < 17; i++)
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sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]);
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sb->s_blocks_count_hi = ext2fs_swab32(sb->s_blocks_count_hi);
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sb->s_r_blocks_count_hi = ext2fs_swab32(sb->s_r_blocks_count_hi);
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sb->s_free_blocks_hi = ext2fs_swab32(sb->s_free_blocks_hi);
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sb->s_min_extra_isize = ext2fs_swab16(sb->s_min_extra_isize);
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sb->s_want_extra_isize = ext2fs_swab16(sb->s_want_extra_isize);
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sb->s_flags = ext2fs_swab32(sb->s_flags);
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sb->s_raid_stride = ext2fs_swab16(sb->s_raid_stride);
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sb->s_mmp_update_interval = ext2fs_swab16(sb->s_mmp_update_interval);
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sb->s_mmp_block = ext2fs_swab64(sb->s_mmp_block);
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sb->s_raid_stripe_width = ext2fs_swab32(sb->s_raid_stripe_width);
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/* sb->s_log_groups_per_flex is __u8 and does not need swabbing */
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/* sb->s_checksum_type is __u8 and does not need swabbing */
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/* sb->s_encryption_level is __u8 and does not need swabbing */
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/* sb->s_reserved_pad is __u8 and does not need swabbing */
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sb->s_kbytes_written = ext2fs_swab64(sb->s_kbytes_written);
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sb->s_snapshot_inum = ext2fs_swab32(sb->s_snapshot_inum);
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sb->s_snapshot_id = ext2fs_swab32(sb->s_snapshot_id);
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sb->s_snapshot_r_blocks_count =
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ext2fs_swab64(sb->s_snapshot_r_blocks_count);
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sb->s_snapshot_list = ext2fs_swab32(sb->s_snapshot_list);
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sb->s_error_count = ext2fs_swab32(sb->s_error_count);
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sb->s_first_error_time = ext2fs_swab32(sb->s_first_error_time);
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sb->s_first_error_ino = ext2fs_swab32(sb->s_first_error_ino);
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sb->s_first_error_block = ext2fs_swab64(sb->s_first_error_block);
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/* sb->s_first_error_func is __u8 and does not need swabbing */
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sb->s_last_error_time = ext2fs_swab32(sb->s_last_error_time);
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sb->s_last_error_ino = ext2fs_swab32(sb->s_last_error_ino);
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sb->s_last_error_block = ext2fs_swab64(sb->s_last_error_block);
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/* sb->s_last_error_func is __u8 and does not need swabbing */
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/* sb->s_mount_opts is __u8 and does not need swabbing */
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sb->s_usr_quota_inum = ext2fs_swab32(sb->s_usr_quota_inum);
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sb->s_grp_quota_inum = ext2fs_swab32(sb->s_grp_quota_inum);
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sb->s_overhead_clusters = ext2fs_swab32(sb->s_overhead_clusters);
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sb->s_backup_bgs[0] = ext2fs_swab32(sb->s_backup_bgs[0]);
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sb->s_backup_bgs[1] = ext2fs_swab32(sb->s_backup_bgs[1]);
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/* sb->s_encrypt_algos is __u8 and does not need swabbing */
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/* sb->s_encrypt_pw_salt is __u8 and does not need swabbing */
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sb->s_lpf_ino = ext2fs_swab32(sb->s_lpf_ino);
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sb->s_prj_quota_inum = ext2fs_swab32(sb->s_prj_quota_inum);
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sb->s_checksum_seed = ext2fs_swab32(sb->s_checksum_seed);
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/* s_*_time_hi are __u8 and does not need swabbing */
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sb->s_encoding = ext2fs_swab16(sb->s_encoding);
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sb->s_encoding_flags = ext2fs_swab16(sb->s_encoding_flags);
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/* catch when new fields are used from s_reserved */
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EXT2FS_BUILD_BUG_ON(sizeof(sb->s_reserved) != 95 * sizeof(__le32));
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sb->s_checksum = ext2fs_swab32(sb->s_checksum);
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}
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void ext2fs_swap_group_desc2(ext2_filsys fs, struct ext2_group_desc *gdp)
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{
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struct ext4_group_desc *gdp4 = (struct ext4_group_desc *)gdp;
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/* Do the 32-bit parts first */
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gdp->bg_block_bitmap = ext2fs_swab32(gdp->bg_block_bitmap);
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gdp->bg_inode_bitmap = ext2fs_swab32(gdp->bg_inode_bitmap);
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gdp->bg_inode_table = ext2fs_swab32(gdp->bg_inode_table);
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gdp->bg_free_blocks_count = ext2fs_swab16(gdp->bg_free_blocks_count);
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gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count);
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gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count);
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gdp->bg_flags = ext2fs_swab16(gdp->bg_flags);
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gdp->bg_exclude_bitmap_lo = ext2fs_swab32(gdp->bg_exclude_bitmap_lo);
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gdp->bg_block_bitmap_csum_lo =
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ext2fs_swab16(gdp->bg_block_bitmap_csum_lo);
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gdp->bg_inode_bitmap_csum_lo =
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ext2fs_swab16(gdp->bg_inode_bitmap_csum_lo);
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gdp->bg_itable_unused = ext2fs_swab16(gdp->bg_itable_unused);
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gdp->bg_checksum = ext2fs_swab16(gdp->bg_checksum);
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/* If we're 32-bit, we're done */
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if (fs == NULL || EXT2_DESC_SIZE(fs->super) < EXT2_MIN_DESC_SIZE_64BIT)
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return;
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/* Swap the 64-bit parts */
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gdp4->bg_block_bitmap_hi = ext2fs_swab32(gdp4->bg_block_bitmap_hi);
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gdp4->bg_inode_bitmap_hi = ext2fs_swab32(gdp4->bg_inode_bitmap_hi);
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gdp4->bg_inode_table_hi = ext2fs_swab32(gdp4->bg_inode_table_hi);
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gdp4->bg_free_blocks_count_hi =
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ext2fs_swab16(gdp4->bg_free_blocks_count_hi);
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gdp4->bg_free_inodes_count_hi =
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ext2fs_swab16(gdp4->bg_free_inodes_count_hi);
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gdp4->bg_used_dirs_count_hi =
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ext2fs_swab16(gdp4->bg_used_dirs_count_hi);
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gdp4->bg_itable_unused_hi = ext2fs_swab16(gdp4->bg_itable_unused_hi);
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gdp4->bg_exclude_bitmap_hi = ext2fs_swab16(gdp4->bg_exclude_bitmap_hi);
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gdp4->bg_block_bitmap_csum_hi =
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ext2fs_swab16(gdp4->bg_block_bitmap_csum_hi);
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gdp4->bg_inode_bitmap_csum_hi =
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ext2fs_swab16(gdp4->bg_inode_bitmap_csum_hi);
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EXT2FS_BUILD_BUG_ON(sizeof(gdp4->bg_reserved) != sizeof(__u32));
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}
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void ext2fs_swap_group_desc(struct ext2_group_desc *gdp)
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{
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ext2fs_swap_group_desc2(0, gdp);
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}
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void ext2fs_swap_ext_attr_header(struct ext2_ext_attr_header *to_header,
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struct ext2_ext_attr_header *from_header)
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{
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int n;
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to_header->h_magic = ext2fs_swab32(from_header->h_magic);
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to_header->h_blocks = ext2fs_swab32(from_header->h_blocks);
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to_header->h_refcount = ext2fs_swab32(from_header->h_refcount);
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to_header->h_hash = ext2fs_swab32(from_header->h_hash);
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to_header->h_checksum = ext2fs_swab32(from_header->h_checksum);
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for (n = 0; n < 3; n++)
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to_header->h_reserved[n] =
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ext2fs_swab32(from_header->h_reserved[n]);
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}
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void ext2fs_swap_ext_attr_entry(struct ext2_ext_attr_entry *to_entry,
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struct ext2_ext_attr_entry *from_entry)
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{
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to_entry->e_value_offs = ext2fs_swab16(from_entry->e_value_offs);
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to_entry->e_value_inum = ext2fs_swab32(from_entry->e_value_inum);
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to_entry->e_value_size = ext2fs_swab32(from_entry->e_value_size);
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to_entry->e_hash = ext2fs_swab32(from_entry->e_hash);
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}
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void ext2fs_swap_ext_attr(char *to, char *from, int bufsize, int has_header)
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{
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struct ext2_ext_attr_header *from_header =
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(struct ext2_ext_attr_header *)from;
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struct ext2_ext_attr_header *to_header =
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(struct ext2_ext_attr_header *)to;
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struct ext2_ext_attr_entry *from_entry, *to_entry;
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char *from_end = (char *)from_header + bufsize;
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if (to_header != from_header)
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memcpy(to_header, from_header, bufsize);
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if (has_header) {
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ext2fs_swap_ext_attr_header(to_header, from_header);
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from_entry = (struct ext2_ext_attr_entry *)(from_header+1);
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to_entry = (struct ext2_ext_attr_entry *)(to_header+1);
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} else {
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from_entry = (struct ext2_ext_attr_entry *)from_header;
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to_entry = (struct ext2_ext_attr_entry *)to_header;
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}
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while ((char *)from_entry < from_end &&
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(char *)EXT2_EXT_ATTR_NEXT(from_entry) <= from_end &&
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*(__u32 *)from_entry) {
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ext2fs_swap_ext_attr_entry(to_entry, from_entry);
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from_entry = EXT2_EXT_ATTR_NEXT(from_entry);
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to_entry = EXT2_EXT_ATTR_NEXT(to_entry);
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}
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}
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void ext2fs_swap_inode_full(ext2_filsys fs, struct ext2_inode_large *t,
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struct ext2_inode_large *f, int hostorder,
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int bufsize)
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{
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unsigned i, extra_isize, attr_magic;
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int has_extents, has_inline_data, islnk, fast_symlink;
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unsigned int inode_size;
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__u32 *eaf, *eat;
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/*
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* Note that t and f may point to the same address. That's why
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* if (hostorder) condition is executed before swab calls and
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* if (!hostorder) afterwards.
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*/
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if (hostorder) {
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islnk = LINUX_S_ISLNK(f->i_mode);
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fast_symlink = ext2fs_is_fast_symlink(EXT2_INODE(f));
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has_extents = (f->i_flags & EXT4_EXTENTS_FL) != 0;
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has_inline_data = (f->i_flags & EXT4_INLINE_DATA_FL) != 0;
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}
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t->i_mode = ext2fs_swab16(f->i_mode);
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t->i_uid = ext2fs_swab16(f->i_uid);
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t->i_size = ext2fs_swab32(f->i_size);
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t->i_atime = ext2fs_swab32(f->i_atime);
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t->i_ctime = ext2fs_swab32(f->i_ctime);
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t->i_mtime = ext2fs_swab32(f->i_mtime);
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t->i_dtime = ext2fs_swab32(f->i_dtime);
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t->i_gid = ext2fs_swab16(f->i_gid);
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t->i_links_count = ext2fs_swab16(f->i_links_count);
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t->i_file_acl = ext2fs_swab32(f->i_file_acl);
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t->i_blocks = ext2fs_swab32(f->i_blocks);
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t->i_flags = ext2fs_swab32(f->i_flags);
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t->i_size_high = ext2fs_swab32(f->i_size_high);
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if (!hostorder) {
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islnk = LINUX_S_ISLNK(t->i_mode);
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fast_symlink = ext2fs_is_fast_symlink(EXT2_INODE(t));
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has_extents = (t->i_flags & EXT4_EXTENTS_FL) != 0;
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has_inline_data = (t->i_flags & EXT4_INLINE_DATA_FL) != 0;
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}
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/*
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* Extent data and inline data are swapped on access, not here
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*/
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if (!has_extents && !has_inline_data && (!islnk || !fast_symlink)) {
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for (i = 0; i < EXT2_N_BLOCKS; i++)
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t->i_block[i] = ext2fs_swab32(f->i_block[i]);
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} else if (t != f) {
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for (i = 0; i < EXT2_N_BLOCKS; i++)
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t->i_block[i] = f->i_block[i];
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}
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t->i_generation = ext2fs_swab32(f->i_generation);
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t->i_faddr = ext2fs_swab32(f->i_faddr);
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switch (fs->super->s_creator_os) {
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case EXT2_OS_LINUX:
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t->osd1.linux1.l_i_version =
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ext2fs_swab32(f->osd1.linux1.l_i_version);
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t->osd2.linux2.l_i_blocks_hi =
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ext2fs_swab16(f->osd2.linux2.l_i_blocks_hi);
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t->osd2.linux2.l_i_file_acl_high =
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ext2fs_swab16(f->osd2.linux2.l_i_file_acl_high);
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t->osd2.linux2.l_i_uid_high =
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ext2fs_swab16 (f->osd2.linux2.l_i_uid_high);
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t->osd2.linux2.l_i_gid_high =
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ext2fs_swab16 (f->osd2.linux2.l_i_gid_high);
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t->osd2.linux2.l_i_checksum_lo =
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ext2fs_swab16(f->osd2.linux2.l_i_checksum_lo);
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break;
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case EXT2_OS_HURD:
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t->osd1.hurd1.h_i_translator =
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ext2fs_swab32 (f->osd1.hurd1.h_i_translator);
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t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag;
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t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize;
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t->osd2.hurd2.h_i_mode_high =
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ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high);
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t->osd2.hurd2.h_i_uid_high =
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ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high);
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t->osd2.hurd2.h_i_gid_high =
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ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high);
|
|
t->osd2.hurd2.h_i_author =
|
|
ext2fs_swab32 (f->osd2.hurd2.h_i_author);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16)))
|
|
return; /* no i_extra_isize field */
|
|
|
|
if (hostorder)
|
|
extra_isize = f->i_extra_isize;
|
|
t->i_extra_isize = ext2fs_swab16(f->i_extra_isize);
|
|
if (!hostorder)
|
|
extra_isize = t->i_extra_isize;
|
|
if (extra_isize > EXT2_INODE_SIZE(fs->super) -
|
|
sizeof(struct ext2_inode)) {
|
|
/* this is error case: i_extra_size is too large */
|
|
return;
|
|
}
|
|
if (extra_isize & 3)
|
|
return; /* Illegal inode extra_isize */
|
|
|
|
inode_size = EXT2_GOOD_OLD_INODE_SIZE + extra_isize;
|
|
if (inode_includes(inode_size, i_checksum_hi))
|
|
t->i_checksum_hi = ext2fs_swab16(f->i_checksum_hi);
|
|
if (inode_includes(inode_size, i_ctime_extra))
|
|
t->i_ctime_extra = ext2fs_swab32(f->i_ctime_extra);
|
|
if (inode_includes(inode_size, i_mtime_extra))
|
|
t->i_mtime_extra = ext2fs_swab32(f->i_mtime_extra);
|
|
if (inode_includes(inode_size, i_atime_extra))
|
|
t->i_atime_extra = ext2fs_swab32(f->i_atime_extra);
|
|
if (inode_includes(inode_size, i_crtime))
|
|
t->i_crtime = ext2fs_swab32(f->i_crtime);
|
|
if (inode_includes(inode_size, i_crtime_extra))
|
|
t->i_crtime_extra = ext2fs_swab32(f->i_crtime_extra);
|
|
if (inode_includes(inode_size, i_version_hi))
|
|
t->i_version_hi = ext2fs_swab32(f->i_version_hi);
|
|
if (inode_includes(inode_size, i_projid))
|
|
t->i_projid = ext2fs_swab32(f->i_projid);
|
|
/* catch new static fields added after i_projid */
|
|
EXT2FS_BUILD_BUG_ON(sizeof(struct ext2_inode_large) != 160);
|
|
|
|
i = sizeof(struct ext2_inode) + extra_isize + sizeof(__u32);
|
|
if (bufsize < (int) i)
|
|
return; /* no space for EA magic */
|
|
|
|
eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) +
|
|
extra_isize);
|
|
|
|
attr_magic = *eaf;
|
|
if (!hostorder)
|
|
attr_magic = ext2fs_swab32(attr_magic);
|
|
|
|
if (attr_magic != EXT2_EXT_ATTR_MAGIC)
|
|
return; /* it seems no magic here */
|
|
|
|
eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) +
|
|
extra_isize);
|
|
*eat = ext2fs_swab32(*eaf);
|
|
|
|
/* convert EA(s) */
|
|
ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1),
|
|
bufsize - sizeof(struct ext2_inode) -
|
|
extra_isize - sizeof(__u32), 0);
|
|
|
|
}
|
|
|
|
void ext2fs_swap_inode(ext2_filsys fs, struct ext2_inode *t,
|
|
struct ext2_inode *f, int hostorder)
|
|
{
|
|
ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) t,
|
|
(struct ext2_inode_large *) f, hostorder,
|
|
sizeof(struct ext2_inode));
|
|
}
|
|
|
|
void ext2fs_swap_mmp(struct mmp_struct *mmp)
|
|
{
|
|
mmp->mmp_magic = ext2fs_swab32(mmp->mmp_magic);
|
|
mmp->mmp_seq = ext2fs_swab32(mmp->mmp_seq);
|
|
mmp->mmp_time = ext2fs_swab64(mmp->mmp_time);
|
|
mmp->mmp_check_interval = ext2fs_swab16(mmp->mmp_check_interval);
|
|
mmp->mmp_checksum = ext2fs_swab32(mmp->mmp_checksum);
|
|
}
|
|
|
|
errcode_t ext2fs_dirent_swab_in(ext2_filsys fs, char *buf, int flags)
|
|
{
|
|
return ext2fs_dirent_swab_in2(fs, buf, fs->blocksize, flags);
|
|
}
|
|
|
|
errcode_t ext2fs_dirent_swab_in2(ext2_filsys fs, char *buf,
|
|
size_t size, int flags)
|
|
{
|
|
errcode_t retval;
|
|
char *p, *end;
|
|
struct ext2_dir_entry *dirent;
|
|
unsigned int name_len, rec_len, left;
|
|
|
|
p = (char *) buf;
|
|
end = (char *) buf + size;
|
|
left = size;
|
|
while (p < end-8) {
|
|
dirent = (struct ext2_dir_entry *) p;
|
|
dirent->inode = ext2fs_swab32(dirent->inode);
|
|
dirent->rec_len = ext2fs_swab16(dirent->rec_len);
|
|
dirent->name_len = ext2fs_swab16(dirent->name_len);
|
|
name_len = dirent->name_len;
|
|
if (flags & EXT2_DIRBLOCK_V2_STRUCT)
|
|
dirent->name_len = ext2fs_swab16(dirent->name_len);
|
|
retval = ext2fs_get_rec_len(fs, dirent, &rec_len);
|
|
if (retval)
|
|
return retval;
|
|
if ((rec_len < 8) || (rec_len % 4)) {
|
|
rec_len = 8;
|
|
retval = EXT2_ET_DIR_CORRUPTED;
|
|
} else if (((name_len & 0xFF) + 8) > rec_len)
|
|
retval = EXT2_ET_DIR_CORRUPTED;
|
|
if (rec_len > left)
|
|
return EXT2_ET_DIR_CORRUPTED;
|
|
left -= rec_len;
|
|
p += rec_len;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
errcode_t ext2fs_dirent_swab_out(ext2_filsys fs, char *buf, int flags)
|
|
{
|
|
return ext2fs_dirent_swab_out2(fs, buf, fs->blocksize, flags);
|
|
}
|
|
|
|
errcode_t ext2fs_dirent_swab_out2(ext2_filsys fs, char *buf,
|
|
size_t size, int flags)
|
|
{
|
|
errcode_t retval;
|
|
char *p, *end;
|
|
unsigned int rec_len;
|
|
struct ext2_dir_entry *dirent;
|
|
|
|
p = buf;
|
|
end = buf + size;
|
|
while (p < end) {
|
|
dirent = (struct ext2_dir_entry *) p;
|
|
retval = ext2fs_get_rec_len(fs, dirent, &rec_len);
|
|
if (retval)
|
|
return retval;
|
|
if ((rec_len < 8) ||
|
|
(rec_len % 4)) {
|
|
ext2fs_free_mem(&buf);
|
|
return EXT2_ET_DIR_CORRUPTED;
|
|
}
|
|
p += rec_len;
|
|
dirent->inode = ext2fs_swab32(dirent->inode);
|
|
dirent->rec_len = ext2fs_swab16(dirent->rec_len);
|
|
dirent->name_len = ext2fs_swab16(dirent->name_len);
|
|
if (rec_len > size)
|
|
return EXT2_ET_DIR_CORRUPTED;
|
|
size -= rec_len;
|
|
|
|
if (flags & EXT2_DIRBLOCK_V2_STRUCT)
|
|
dirent->name_len = ext2fs_swab16(dirent->name_len);
|
|
}
|
|
|
|
return 0;
|
|
}
|