2 * swapfs.c --- swap ext2 filesystem data structures
4 * Copyright (C) 1995, 1996, 2002 Theodore Ts'o.
7 * This file may be redistributed under the terms of the GNU Public
21 #include <ext2fs/ext2_ext_attr.h>
23 #ifdef EXT2FS_ENABLE_SWAPFS
24 void ext2fs_swap_super(struct ext2_super_block * sb)
27 sb->s_inodes_count = ext2fs_swab32(sb->s_inodes_count);
28 sb->s_blocks_count = ext2fs_swab32(sb->s_blocks_count);
29 sb->s_r_blocks_count = ext2fs_swab32(sb->s_r_blocks_count);
30 sb->s_free_blocks_count = ext2fs_swab32(sb->s_free_blocks_count);
31 sb->s_free_inodes_count = ext2fs_swab32(sb->s_free_inodes_count);
32 sb->s_first_data_block = ext2fs_swab32(sb->s_first_data_block);
33 sb->s_log_block_size = ext2fs_swab32(sb->s_log_block_size);
34 sb->s_log_frag_size = ext2fs_swab32(sb->s_log_frag_size);
35 sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group);
36 sb->s_frags_per_group = ext2fs_swab32(sb->s_frags_per_group);
37 sb->s_inodes_per_group = ext2fs_swab32(sb->s_inodes_per_group);
38 sb->s_mtime = ext2fs_swab32(sb->s_mtime);
39 sb->s_wtime = ext2fs_swab32(sb->s_wtime);
40 sb->s_mnt_count = ext2fs_swab16(sb->s_mnt_count);
41 sb->s_max_mnt_count = ext2fs_swab16(sb->s_max_mnt_count);
42 sb->s_magic = ext2fs_swab16(sb->s_magic);
43 sb->s_state = ext2fs_swab16(sb->s_state);
44 sb->s_errors = ext2fs_swab16(sb->s_errors);
45 sb->s_minor_rev_level = ext2fs_swab16(sb->s_minor_rev_level);
46 sb->s_lastcheck = ext2fs_swab32(sb->s_lastcheck);
47 sb->s_checkinterval = ext2fs_swab32(sb->s_checkinterval);
48 sb->s_creator_os = ext2fs_swab32(sb->s_creator_os);
49 sb->s_rev_level = ext2fs_swab32(sb->s_rev_level);
50 sb->s_def_resuid = ext2fs_swab16(sb->s_def_resuid);
51 sb->s_def_resgid = ext2fs_swab16(sb->s_def_resgid);
52 sb->s_first_ino = ext2fs_swab32(sb->s_first_ino);
53 sb->s_inode_size = ext2fs_swab16(sb->s_inode_size);
54 sb->s_block_group_nr = ext2fs_swab16(sb->s_block_group_nr);
55 sb->s_feature_compat = ext2fs_swab32(sb->s_feature_compat);
56 sb->s_feature_incompat = ext2fs_swab32(sb->s_feature_incompat);
57 sb->s_feature_ro_compat = ext2fs_swab32(sb->s_feature_ro_compat);
58 sb->s_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap);
59 sb->s_reserved_gdt_blocks = ext2fs_swab16(sb->s_reserved_gdt_blocks);
60 sb->s_journal_inum = ext2fs_swab32(sb->s_journal_inum);
61 sb->s_journal_dev = ext2fs_swab32(sb->s_journal_dev);
62 sb->s_last_orphan = ext2fs_swab32(sb->s_last_orphan);
63 sb->s_desc_size = ext2fs_swab16(sb->s_desc_size);
64 sb->s_default_mount_opts = ext2fs_swab32(sb->s_default_mount_opts);
65 sb->s_first_meta_bg = ext2fs_swab32(sb->s_first_meta_bg);
66 sb->s_mkfs_time = ext2fs_swab32(sb->s_mkfs_time);
67 sb->s_blocks_count_hi = ext2fs_swab32(sb->s_blocks_count_hi);
68 sb->s_r_blocks_count_hi = ext2fs_swab32(sb->s_r_blocks_count_hi);
69 sb->s_free_blocks_hi = ext2fs_swab32(sb->s_free_blocks_hi);
70 sb->s_min_extra_isize = ext2fs_swab16(sb->s_min_extra_isize);
71 sb->s_want_extra_isize = ext2fs_swab16(sb->s_want_extra_isize);
73 sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]);
74 for (i=0; i < 17; i++)
75 sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]);
79 void ext2fs_swap_group_desc(struct ext2_group_desc *gdp)
81 gdp->bg_block_bitmap = ext2fs_swab32(gdp->bg_block_bitmap);
82 gdp->bg_inode_bitmap = ext2fs_swab32(gdp->bg_inode_bitmap);
83 gdp->bg_inode_table = ext2fs_swab32(gdp->bg_inode_table);
84 gdp->bg_free_blocks_count = ext2fs_swab16(gdp->bg_free_blocks_count);
85 gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count);
86 gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count);
87 gdp->bg_flags = ext2fs_swab16(gdp->bg_flags);
88 gdp->bg_itable_unused = ext2fs_swab16(gdp->bg_itable_unused);
89 gdp->bg_checksum = ext2fs_swab16(gdp->bg_checksum);
92 void ext2fs_swap_ext_attr(char *to, char *from, int bufsize, int has_header)
94 struct ext2_ext_attr_header *from_header =
95 (struct ext2_ext_attr_header *)from;
96 struct ext2_ext_attr_header *to_header =
97 (struct ext2_ext_attr_header *)to;
98 struct ext2_ext_attr_entry *from_entry, *to_entry;
99 char *from_end = (char *)from_header + bufsize;
102 if (to_header != from_header)
103 memcpy(to_header, from_header, bufsize);
105 from_entry = (struct ext2_ext_attr_entry *)from_header;
106 to_entry = (struct ext2_ext_attr_entry *)to_header;
109 to_header->h_magic = ext2fs_swab32(from_header->h_magic);
110 to_header->h_blocks = ext2fs_swab32(from_header->h_blocks);
111 to_header->h_refcount = ext2fs_swab32(from_header->h_refcount);
113 to_header->h_reserved[n] =
114 ext2fs_swab32(from_header->h_reserved[n]);
115 from_entry = (struct ext2_ext_attr_entry *)(from_header+1);
116 to_entry = (struct ext2_ext_attr_entry *)(to_header+1);
119 while ((char *)from_entry < from_end && *(__u32 *)from_entry) {
120 to_entry->e_value_offs =
121 ext2fs_swab16(from_entry->e_value_offs);
122 to_entry->e_value_block =
123 ext2fs_swab32(from_entry->e_value_block);
124 to_entry->e_value_size =
125 ext2fs_swab32(from_entry->e_value_size);
126 from_entry = EXT2_EXT_ATTR_NEXT(from_entry);
127 to_entry = EXT2_EXT_ATTR_NEXT(to_entry);
131 void ext2fs_swap_inode_full(ext2_filsys fs, struct ext2_inode_large *t,
132 struct ext2_inode_large *f, int hostorder,
139 if (hostorder && LINUX_S_ISLNK(f->i_mode))
141 t->i_mode = ext2fs_swab16(f->i_mode);
142 if (!hostorder && LINUX_S_ISLNK(t->i_mode))
144 t->i_uid = ext2fs_swab16(f->i_uid);
145 t->i_size = ext2fs_swab32(f->i_size);
146 t->i_atime = ext2fs_swab32(f->i_atime);
147 t->i_ctime = ext2fs_swab32(f->i_ctime);
148 t->i_mtime = ext2fs_swab32(f->i_mtime);
149 t->i_dtime = ext2fs_swab32(f->i_dtime);
150 t->i_gid = ext2fs_swab16(f->i_gid);
151 t->i_links_count = ext2fs_swab16(f->i_links_count);
152 t->i_blocks = ext2fs_swab32(f->i_blocks);
153 t->i_flags = ext2fs_swab32(f->i_flags);
154 t->i_file_acl = ext2fs_swab32(f->i_file_acl);
155 t->i_dir_acl = ext2fs_swab32(f->i_dir_acl);
156 if (!islnk || ext2fs_inode_data_blocks(fs, (struct ext2_inode *)t)) {
157 for (i = 0; i < EXT2_N_BLOCKS; i++)
158 t->i_block[i] = ext2fs_swab32(f->i_block[i]);
160 for (i = 0; i < EXT2_N_BLOCKS; i++)
161 t->i_block[i] = f->i_block[i];
163 t->i_generation = ext2fs_swab32(f->i_generation);
164 t->i_faddr = ext2fs_swab32(f->i_faddr);
166 switch (fs->super->s_creator_os) {
168 t->osd1.linux1.l_i_reserved1 =
169 ext2fs_swab32(f->osd1.linux1.l_i_reserved1);
170 t->osd2.linux2.l_i_blocks_hi =
171 ext2fs_swab16(f->osd2.linux2.l_i_blocks_hi);
172 t->osd2.linux2.i_pad1 = ext2fs_swab16(f->osd2.linux2.i_pad1);
173 t->osd2.linux2.l_i_uid_high =
174 ext2fs_swab16 (f->osd2.linux2.l_i_uid_high);
175 t->osd2.linux2.l_i_gid_high =
176 ext2fs_swab16 (f->osd2.linux2.l_i_gid_high);
177 t->osd2.linux2.l_i_reserved2 =
178 ext2fs_swab32(f->osd2.linux2.l_i_reserved2);
181 t->osd1.hurd1.h_i_translator =
182 ext2fs_swab32 (f->osd1.hurd1.h_i_translator);
183 t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag;
184 t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize;
185 t->osd2.hurd2.h_i_mode_high =
186 ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high);
187 t->osd2.hurd2.h_i_uid_high =
188 ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high);
189 t->osd2.hurd2.h_i_gid_high =
190 ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high);
191 t->osd2.hurd2.h_i_author =
192 ext2fs_swab32 (f->osd2.hurd2.h_i_author);
195 t->osd1.masix1.m_i_reserved1 =
196 ext2fs_swab32(f->osd1.masix1.m_i_reserved1);
197 t->osd2.masix2.m_i_frag = f->osd2.masix2.m_i_frag;
198 t->osd2.masix2.m_i_fsize = f->osd2.masix2.m_i_fsize;
199 t->osd2.masix2.m_pad1 = ext2fs_swab16(f->osd2.masix2.m_pad1);
200 t->osd2.masix2.m_i_reserved2[0] =
201 ext2fs_swab32(f->osd2.masix2.m_i_reserved2[0]);
202 t->osd2.masix2.m_i_reserved2[1] =
203 ext2fs_swab32(f->osd2.masix2.m_i_reserved2[1]);
207 if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16)))
208 return; /* no i_extra_isize field */
210 t->i_extra_isize = ext2fs_swab16(f->i_extra_isize);
211 if (t->i_extra_isize > EXT2_INODE_SIZE(fs->super) -
212 sizeof(struct ext2_inode)) {
213 /* this is error case: i_extra_size is too large */
217 i = sizeof(struct ext2_inode) + t->i_extra_isize + sizeof(__u32);
218 if (bufsize < (int) i)
219 return; /* no space for EA magic */
221 eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) +
224 if (ext2fs_swab32(*eaf) != EXT2_EXT_ATTR_MAGIC)
225 return; /* it seems no magic here */
227 eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) +
229 *eat = ext2fs_swab32(*eaf);
232 ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1),
233 bufsize - sizeof(struct ext2_inode) -
234 t->i_extra_isize - sizeof(__u32), 0);
238 void ext2fs_swap_inode(ext2_filsys fs, struct ext2_inode *t,
239 struct ext2_inode *f, int hostorder)
241 ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) t,
242 (struct ext2_inode_large *) f, hostorder,
243 sizeof(struct ext2_inode));