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238 lines
8.4 KiB
C
238 lines
8.4 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 Public
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* License.
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* %End-Header%
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*/
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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 "ext2_ext_attr.h"
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#ifdef EXT2FS_ENABLE_SWAPFS
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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_frag_size = ext2fs_swab32(sb->s_log_frag_size);
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sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group);
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sb->s_frags_per_group = ext2fs_swab32(sb->s_frags_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_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap);
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sb->s_reserved_gdt_blocks = ext2fs_swab16(sb->s_reserved_gdt_blocks);
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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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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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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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for (i=0; i < 17; i++)
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sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]);
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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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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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}
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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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int n;
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if (to_header != from_header)
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memcpy(to_header, from_header, bufsize);
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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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if (has_header) {
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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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for (n=0; n<4; 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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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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}
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while ((char *)from_entry < from_end && *(__u32 *)from_entry) {
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to_entry->e_value_offs =
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ext2fs_swab16(from_entry->e_value_offs);
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to_entry->e_value_block =
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ext2fs_swab32(from_entry->e_value_block);
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to_entry->e_value_size =
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ext2fs_swab32(from_entry->e_value_size);
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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;
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int islnk = 0;
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__u32 *eaf, *eat;
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if (hostorder && LINUX_S_ISLNK(f->i_mode))
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islnk = 1;
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t->i_mode = ext2fs_swab16(f->i_mode);
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if (!hostorder && LINUX_S_ISLNK(t->i_mode))
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islnk = 1;
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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_blocks = ext2fs_swab32(f->i_blocks);
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t->i_flags = ext2fs_swab32(f->i_flags);
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t->i_file_acl = ext2fs_swab32(f->i_file_acl);
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t->i_dir_acl = ext2fs_swab32(f->i_dir_acl);
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if (!islnk || ext2fs_inode_data_blocks(fs, (struct ext2_inode *)t)) {
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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_reserved1 =
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ext2fs_swab32(f->osd1.linux1.l_i_reserved1);
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t->osd2.linux2.l_i_frag = f->osd2.linux2.l_i_frag;
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t->osd2.linux2.l_i_fsize = f->osd2.linux2.l_i_fsize;
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t->osd2.linux2.i_pad1 = ext2fs_swab16(f->osd2.linux2.i_pad1);
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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_reserved2 =
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ext2fs_swab32(f->osd2.linux2.l_i_reserved2);
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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);
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t->osd2.hurd2.h_i_author =
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ext2fs_swab32 (f->osd2.hurd2.h_i_author);
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break;
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case EXT2_OS_MASIX:
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t->osd1.masix1.m_i_reserved1 =
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ext2fs_swab32(f->osd1.masix1.m_i_reserved1);
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t->osd2.masix2.m_i_frag = f->osd2.masix2.m_i_frag;
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t->osd2.masix2.m_i_fsize = f->osd2.masix2.m_i_fsize;
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t->osd2.masix2.m_pad1 = ext2fs_swab16(f->osd2.masix2.m_pad1);
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t->osd2.masix2.m_i_reserved2[0] =
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ext2fs_swab32(f->osd2.masix2.m_i_reserved2[0]);
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t->osd2.masix2.m_i_reserved2[1] =
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ext2fs_swab32(f->osd2.masix2.m_i_reserved2[1]);
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break;
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}
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if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16)))
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return; /* no i_extra_isize field */
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t->i_extra_isize = ext2fs_swab16(f->i_extra_isize);
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if (t->i_extra_isize > EXT2_INODE_SIZE(fs->super) -
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sizeof(struct ext2_inode)) {
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/* this is error case: i_extra_size is too large */
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return;
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}
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i = sizeof(struct ext2_inode) + t->i_extra_isize + sizeof(__u32);
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if (bufsize < (int) i)
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return; /* no space for EA magic */
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eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) +
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f->i_extra_isize);
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if (ext2fs_swab32(*eaf) != EXT2_EXT_ATTR_MAGIC)
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return; /* it seems no magic here */
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eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) +
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f->i_extra_isize);
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*eat = ext2fs_swab32(*eaf);
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/* convert EA(s) */
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ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1),
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bufsize - sizeof(struct ext2_inode) -
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t->i_extra_isize - sizeof(__u32), 0);
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}
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void ext2fs_swap_inode(ext2_filsys fs, struct ext2_inode *t,
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struct ext2_inode *f, int hostorder)
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{
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ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) t,
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(struct ext2_inode_large *) f, hostorder,
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sizeof(struct ext2_inode));
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}
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#endif
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