| /* vi: set sw=4 ts=4: */ |
| /* |
| * swapfs.c --- swap ext2 filesystem data structures |
| * |
| * Copyright (C) 1995, 1996, 2002 Theodore Ts'o. |
| * |
| * %Begin-Header% |
| * This file may be redistributed under the terms of the GNU Public |
| * License. |
| * %End-Header% |
| */ |
| |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <string.h> |
| #include <time.h> |
| |
| #include "ext2_fs.h" |
| #include "ext2fs.h" |
| #include "ext2_ext_attr.h" |
| |
| #if BB_BIG_ENDIAN |
| void ext2fs_swap_super(struct ext2_super_block * sb) |
| { |
| int i; |
| sb->s_inodes_count = ext2fs_swab32(sb->s_inodes_count); |
| sb->s_blocks_count = ext2fs_swab32(sb->s_blocks_count); |
| sb->s_r_blocks_count = ext2fs_swab32(sb->s_r_blocks_count); |
| sb->s_free_blocks_count = ext2fs_swab32(sb->s_free_blocks_count); |
| sb->s_free_inodes_count = ext2fs_swab32(sb->s_free_inodes_count); |
| sb->s_first_data_block = ext2fs_swab32(sb->s_first_data_block); |
| sb->s_log_block_size = ext2fs_swab32(sb->s_log_block_size); |
| sb->s_log_frag_size = ext2fs_swab32(sb->s_log_frag_size); |
| sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group); |
| sb->s_frags_per_group = ext2fs_swab32(sb->s_frags_per_group); |
| sb->s_inodes_per_group = ext2fs_swab32(sb->s_inodes_per_group); |
| sb->s_mtime = ext2fs_swab32(sb->s_mtime); |
| sb->s_wtime = ext2fs_swab32(sb->s_wtime); |
| sb->s_mnt_count = ext2fs_swab16(sb->s_mnt_count); |
| sb->s_max_mnt_count = ext2fs_swab16(sb->s_max_mnt_count); |
| sb->s_magic = ext2fs_swab16(sb->s_magic); |
| sb->s_state = ext2fs_swab16(sb->s_state); |
| sb->s_errors = ext2fs_swab16(sb->s_errors); |
| sb->s_minor_rev_level = ext2fs_swab16(sb->s_minor_rev_level); |
| sb->s_lastcheck = ext2fs_swab32(sb->s_lastcheck); |
| sb->s_checkinterval = ext2fs_swab32(sb->s_checkinterval); |
| sb->s_creator_os = ext2fs_swab32(sb->s_creator_os); |
| sb->s_rev_level = ext2fs_swab32(sb->s_rev_level); |
| sb->s_def_resuid = ext2fs_swab16(sb->s_def_resuid); |
| sb->s_def_resgid = ext2fs_swab16(sb->s_def_resgid); |
| sb->s_first_ino = ext2fs_swab32(sb->s_first_ino); |
| sb->s_inode_size = ext2fs_swab16(sb->s_inode_size); |
| sb->s_block_group_nr = ext2fs_swab16(sb->s_block_group_nr); |
| sb->s_feature_compat = ext2fs_swab32(sb->s_feature_compat); |
| sb->s_feature_incompat = ext2fs_swab32(sb->s_feature_incompat); |
| sb->s_feature_ro_compat = ext2fs_swab32(sb->s_feature_ro_compat); |
| sb->s_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap); |
| sb->s_reserved_gdt_blocks = ext2fs_swab16(sb->s_reserved_gdt_blocks); |
| sb->s_journal_inum = ext2fs_swab32(sb->s_journal_inum); |
| sb->s_journal_dev = ext2fs_swab32(sb->s_journal_dev); |
| sb->s_last_orphan = ext2fs_swab32(sb->s_last_orphan); |
| sb->s_default_mount_opts = ext2fs_swab32(sb->s_default_mount_opts); |
| sb->s_first_meta_bg = ext2fs_swab32(sb->s_first_meta_bg); |
| sb->s_mkfs_time = ext2fs_swab32(sb->s_mkfs_time); |
| for (i=0; i < 4; i++) |
| sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]); |
| for (i=0; i < 17; i++) |
| sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]); |
| } |
| |
| void ext2fs_swap_group_desc(struct ext2_group_desc *gdp) |
| { |
| gdp->bg_block_bitmap = ext2fs_swab32(gdp->bg_block_bitmap); |
| gdp->bg_inode_bitmap = ext2fs_swab32(gdp->bg_inode_bitmap); |
| gdp->bg_inode_table = ext2fs_swab32(gdp->bg_inode_table); |
| gdp->bg_free_blocks_count = ext2fs_swab16(gdp->bg_free_blocks_count); |
| gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count); |
| gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count); |
| } |
| |
| void ext2fs_swap_ext_attr(char *to, char *from, int bufsize, int has_header) |
| { |
| struct ext2_ext_attr_header *from_header = |
| (struct ext2_ext_attr_header *)from; |
| struct ext2_ext_attr_header *to_header = |
| (struct ext2_ext_attr_header *)to; |
| struct ext2_ext_attr_entry *from_entry, *to_entry; |
| char *from_end = (char *)from_header + bufsize; |
| int n; |
| |
| if (to_header != from_header) |
| memcpy(to_header, from_header, bufsize); |
| |
| from_entry = (struct ext2_ext_attr_entry *)from_header; |
| to_entry = (struct ext2_ext_attr_entry *)to_header; |
| |
| if (has_header) { |
| to_header->h_magic = ext2fs_swab32(from_header->h_magic); |
| to_header->h_blocks = ext2fs_swab32(from_header->h_blocks); |
| to_header->h_refcount = ext2fs_swab32(from_header->h_refcount); |
| for (n=0; n<4; n++) |
| to_header->h_reserved[n] = |
| ext2fs_swab32(from_header->h_reserved[n]); |
| from_entry = (struct ext2_ext_attr_entry *)(from_header+1); |
| to_entry = (struct ext2_ext_attr_entry *)(to_header+1); |
| } |
| |
| while ((char *)from_entry < from_end && *(__u32 *)from_entry) { |
| to_entry->e_value_offs = |
| ext2fs_swab16(from_entry->e_value_offs); |
| to_entry->e_value_block = |
| ext2fs_swab32(from_entry->e_value_block); |
| to_entry->e_value_size = |
| ext2fs_swab32(from_entry->e_value_size); |
| from_entry = EXT2_EXT_ATTR_NEXT(from_entry); |
| to_entry = EXT2_EXT_ATTR_NEXT(to_entry); |
| } |
| } |
| |
| void ext2fs_swap_inode_full(ext2_filsys fs, struct ext2_inode_large *t, |
| struct ext2_inode_large *f, int hostorder, |
| int bufsize) |
| { |
| unsigned i; |
| int islnk = 0; |
| __u32 *eaf, *eat; |
| |
| if (hostorder && LINUX_S_ISLNK(f->i_mode)) |
| islnk = 1; |
| t->i_mode = ext2fs_swab16(f->i_mode); |
| if (!hostorder && LINUX_S_ISLNK(t->i_mode)) |
| islnk = 1; |
| t->i_uid = ext2fs_swab16(f->i_uid); |
| t->i_size = ext2fs_swab32(f->i_size); |
| t->i_atime = ext2fs_swab32(f->i_atime); |
| t->i_ctime = ext2fs_swab32(f->i_ctime); |
| t->i_mtime = ext2fs_swab32(f->i_mtime); |
| t->i_dtime = ext2fs_swab32(f->i_dtime); |
| t->i_gid = ext2fs_swab16(f->i_gid); |
| t->i_links_count = ext2fs_swab16(f->i_links_count); |
| t->i_blocks = ext2fs_swab32(f->i_blocks); |
| t->i_flags = ext2fs_swab32(f->i_flags); |
| t->i_file_acl = ext2fs_swab32(f->i_file_acl); |
| t->i_dir_acl = ext2fs_swab32(f->i_dir_acl); |
| if (!islnk || ext2fs_inode_data_blocks(fs, (struct ext2_inode *)t)) { |
| for (i = 0; i < EXT2_N_BLOCKS; i++) |
| t->i_block[i] = ext2fs_swab32(f->i_block[i]); |
| } else if (t != f) { |
| for (i = 0; i < EXT2_N_BLOCKS; i++) |
| t->i_block[i] = f->i_block[i]; |
| } |
| t->i_generation = ext2fs_swab32(f->i_generation); |
| t->i_faddr = ext2fs_swab32(f->i_faddr); |
| |
| switch (fs->super->s_creator_os) { |
| case EXT2_OS_LINUX: |
| t->osd1.linux1.l_i_reserved1 = |
| ext2fs_swab32(f->osd1.linux1.l_i_reserved1); |
| t->osd2.linux2.l_i_frag = f->osd2.linux2.l_i_frag; |
| t->osd2.linux2.l_i_fsize = f->osd2.linux2.l_i_fsize; |
| t->osd2.linux2.i_pad1 = ext2fs_swab16(f->osd2.linux2.i_pad1); |
| t->osd2.linux2.l_i_uid_high = |
| ext2fs_swab16 (f->osd2.linux2.l_i_uid_high); |
| t->osd2.linux2.l_i_gid_high = |
| ext2fs_swab16 (f->osd2.linux2.l_i_gid_high); |
| t->osd2.linux2.l_i_reserved2 = |
| ext2fs_swab32(f->osd2.linux2.l_i_reserved2); |
| break; |
| case EXT2_OS_HURD: |
| t->osd1.hurd1.h_i_translator = |
| ext2fs_swab32 (f->osd1.hurd1.h_i_translator); |
| t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag; |
| t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize; |
| t->osd2.hurd2.h_i_mode_high = |
| ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high); |
| t->osd2.hurd2.h_i_uid_high = |
| ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high); |
| t->osd2.hurd2.h_i_gid_high = |
| ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high); |
| t->osd2.hurd2.h_i_author = |
| ext2fs_swab32 (f->osd2.hurd2.h_i_author); |
| break; |
| case EXT2_OS_MASIX: |
| t->osd1.masix1.m_i_reserved1 = |
| ext2fs_swab32(f->osd1.masix1.m_i_reserved1); |
| t->osd2.masix2.m_i_frag = f->osd2.masix2.m_i_frag; |
| t->osd2.masix2.m_i_fsize = f->osd2.masix2.m_i_fsize; |
| t->osd2.masix2.m_pad1 = ext2fs_swab16(f->osd2.masix2.m_pad1); |
| t->osd2.masix2.m_i_reserved2[0] = |
| ext2fs_swab32(f->osd2.masix2.m_i_reserved2[0]); |
| t->osd2.masix2.m_i_reserved2[1] = |
| ext2fs_swab32(f->osd2.masix2.m_i_reserved2[1]); |
| break; |
| } |
| |
| if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16))) |
| return; /* no i_extra_isize field */ |
| |
| t->i_extra_isize = ext2fs_swab16(f->i_extra_isize); |
| if (t->i_extra_isize > EXT2_INODE_SIZE(fs->super) - |
| sizeof(struct ext2_inode)) { |
| /* this is error case: i_extra_size is too large */ |
| return; |
| } |
| |
| i = sizeof(struct ext2_inode) + t->i_extra_isize + sizeof(__u32); |
| if (bufsize < (int) i) |
| return; /* no space for EA magic */ |
| |
| eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) + |
| f->i_extra_isize); |
| |
| if (ext2fs_swab32(*eaf) != EXT2_EXT_ATTR_MAGIC) |
| return; /* it seems no magic here */ |
| |
| eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) + |
| f->i_extra_isize); |
| *eat = ext2fs_swab32(*eaf); |
| |
| /* convert EA(s) */ |
| ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1), |
| bufsize - sizeof(struct ext2_inode) - |
| t->i_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)); |
| } |
| |
| #endif |