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 WORDS_BIGENDIAN
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);
72 sb->s_flags = ext2fs_swab32(sb->s_flags);
73 sb->s_kbytes_written = ext2fs_swab64(sb->s_kbytes_written);
75 sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]);
76 for (i=0; i < 17; i++)
77 sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]);
81 void ext2fs_swap_group_desc2(ext2_filsys fs, struct ext2_group_desc *gdp)
83 /* Do the 32-bit parts first */
84 gdp->bg_block_bitmap = ext2fs_swab32(gdp->bg_block_bitmap);
85 gdp->bg_inode_bitmap = ext2fs_swab32(gdp->bg_inode_bitmap);
86 gdp->bg_inode_table = ext2fs_swab32(gdp->bg_inode_table);
87 gdp->bg_free_blocks_count = ext2fs_swab16(gdp->bg_free_blocks_count);
88 gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count);
89 gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count);
90 gdp->bg_flags = ext2fs_swab16(gdp->bg_flags);
91 gdp->bg_itable_unused = ext2fs_swab16(gdp->bg_itable_unused);
92 gdp->bg_checksum = ext2fs_swab16(gdp->bg_checksum);
93 /* If we're 32-bit, we're done */
94 if (fs && (!fs->super->s_desc_size >= EXT2_MIN_DESC_SIZE_64BIT))
97 /* Swap the 64-bit parts */
98 struct ext4_group_desc *gdp4 = (struct ext4_group_desc *) gdp;
99 gdp4->bg_block_bitmap_hi = ext2fs_swab32(gdp4->bg_block_bitmap_hi);
100 gdp4->bg_inode_bitmap_hi = ext2fs_swab32(gdp4->bg_inode_bitmap_hi);
101 gdp4->bg_inode_table_hi = ext2fs_swab32(gdp4->bg_inode_table_hi);
102 gdp4->bg_free_blocks_count_hi =
103 ext2fs_swab16(gdp4->bg_free_blocks_count_hi);
104 gdp4->bg_free_inodes_count_hi =
105 ext2fs_swab16(gdp4->bg_free_inodes_count_hi);
106 gdp4->bg_used_dirs_count_hi =
107 ext2fs_swab16(gdp4->bg_used_dirs_count_hi);
108 gdp4->bg_itable_unused_hi = ext2fs_swab16(gdp4->bg_itable_unused_hi);
111 void ext2fs_swap_group_desc(struct ext2_group_desc *gdp)
113 return ext2fs_swap_group_desc2(0, gdp);
117 void ext2fs_swap_ext_attr_header(struct ext2_ext_attr_header *to_header,
118 struct ext2_ext_attr_header *from_header)
122 to_header->h_magic = ext2fs_swab32(from_header->h_magic);
123 to_header->h_blocks = ext2fs_swab32(from_header->h_blocks);
124 to_header->h_refcount = ext2fs_swab32(from_header->h_refcount);
125 to_header->h_hash = ext2fs_swab32(from_header->h_hash);
126 for (n = 0; n < 4; n++)
127 to_header->h_reserved[n] =
128 ext2fs_swab32(from_header->h_reserved[n]);
131 void ext2fs_swap_ext_attr_entry(struct ext2_ext_attr_entry *to_entry,
132 struct ext2_ext_attr_entry *from_entry)
134 to_entry->e_value_offs = ext2fs_swab16(from_entry->e_value_offs);
135 to_entry->e_value_block = ext2fs_swab32(from_entry->e_value_block);
136 to_entry->e_value_size = ext2fs_swab32(from_entry->e_value_size);
137 to_entry->e_hash = ext2fs_swab32(from_entry->e_hash);
140 void ext2fs_swap_ext_attr(char *to, char *from, int bufsize, int has_header)
142 struct ext2_ext_attr_header *from_header =
143 (struct ext2_ext_attr_header *)from;
144 struct ext2_ext_attr_header *to_header =
145 (struct ext2_ext_attr_header *)to;
146 struct ext2_ext_attr_entry *from_entry, *to_entry;
147 char *from_end = (char *)from_header + bufsize;
149 if (to_header != from_header)
150 memcpy(to_header, from_header, bufsize);
153 ext2fs_swap_ext_attr_header(to_header, from_header);
155 from_entry = (struct ext2_ext_attr_entry *)(from_header+1);
156 to_entry = (struct ext2_ext_attr_entry *)(to_header+1);
158 from_entry = (struct ext2_ext_attr_entry *)from_header;
159 to_entry = (struct ext2_ext_attr_entry *)to_header;
162 while ((char *)from_entry < from_end && *(__u32 *)from_entry) {
163 ext2fs_swap_ext_attr_entry(to_entry, from_entry);
164 from_entry = EXT2_EXT_ATTR_NEXT(from_entry);
165 to_entry = EXT2_EXT_ATTR_NEXT(to_entry);
169 void ext2fs_swap_inode_full(ext2_filsys fs, struct ext2_inode_large *t,
170 struct ext2_inode_large *f, int hostorder,
173 unsigned i, has_data_blocks, extra_isize, attr_magic;
178 if (hostorder && LINUX_S_ISLNK(f->i_mode))
180 t->i_mode = ext2fs_swab16(f->i_mode);
181 if (!hostorder && LINUX_S_ISLNK(t->i_mode))
183 t->i_uid = ext2fs_swab16(f->i_uid);
184 t->i_size = ext2fs_swab32(f->i_size);
185 t->i_atime = ext2fs_swab32(f->i_atime);
186 t->i_ctime = ext2fs_swab32(f->i_ctime);
187 t->i_mtime = ext2fs_swab32(f->i_mtime);
188 t->i_dtime = ext2fs_swab32(f->i_dtime);
189 t->i_gid = ext2fs_swab16(f->i_gid);
190 t->i_links_count = ext2fs_swab16(f->i_links_count);
191 t->i_file_acl = ext2fs_swab32(f->i_file_acl);
193 has_data_blocks = ext2fs_inode_data_blocks(fs,
194 (struct ext2_inode *) f);
195 t->i_blocks = ext2fs_swab32(f->i_blocks);
197 has_data_blocks = ext2fs_inode_data_blocks(fs,
198 (struct ext2_inode *) t);
199 if (hostorder && (f->i_flags & EXT4_EXTENTS_FL))
201 t->i_flags = ext2fs_swab32(f->i_flags);
202 if (!hostorder && (t->i_flags & EXT4_EXTENTS_FL))
204 t->i_dir_acl = ext2fs_swab32(f->i_dir_acl);
205 /* extent data are swapped on access, not here */
206 if (!has_extents && (!islnk || has_data_blocks)) {
207 for (i = 0; i < EXT2_N_BLOCKS; i++)
208 t->i_block[i] = ext2fs_swab32(f->i_block[i]);
210 for (i = 0; i < EXT2_N_BLOCKS; i++)
211 t->i_block[i] = f->i_block[i];
213 t->i_generation = ext2fs_swab32(f->i_generation);
214 t->i_faddr = ext2fs_swab32(f->i_faddr);
216 switch (fs->super->s_creator_os) {
218 t->osd1.linux1.l_i_version =
219 ext2fs_swab32(f->osd1.linux1.l_i_version);
220 t->osd2.linux2.l_i_blocks_hi =
221 ext2fs_swab16(f->osd2.linux2.l_i_blocks_hi);
222 t->osd2.linux2.l_i_file_acl_high =
223 ext2fs_swab16(f->osd2.linux2.l_i_file_acl_high);
224 t->osd2.linux2.l_i_uid_high =
225 ext2fs_swab16 (f->osd2.linux2.l_i_uid_high);
226 t->osd2.linux2.l_i_gid_high =
227 ext2fs_swab16 (f->osd2.linux2.l_i_gid_high);
228 t->osd2.linux2.l_i_reserved2 =
229 ext2fs_swab32(f->osd2.linux2.l_i_reserved2);
232 t->osd1.hurd1.h_i_translator =
233 ext2fs_swab32 (f->osd1.hurd1.h_i_translator);
234 t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag;
235 t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize;
236 t->osd2.hurd2.h_i_mode_high =
237 ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high);
238 t->osd2.hurd2.h_i_uid_high =
239 ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high);
240 t->osd2.hurd2.h_i_gid_high =
241 ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high);
242 t->osd2.hurd2.h_i_author =
243 ext2fs_swab32 (f->osd2.hurd2.h_i_author);
249 if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16)))
250 return; /* no i_extra_isize field */
253 extra_isize = f->i_extra_isize;
254 t->i_extra_isize = ext2fs_swab16(f->i_extra_isize);
256 extra_isize = t->i_extra_isize;
257 if (extra_isize > EXT2_INODE_SIZE(fs->super) -
258 sizeof(struct ext2_inode)) {
259 /* this is error case: i_extra_size is too large */
263 i = sizeof(struct ext2_inode) + extra_isize + sizeof(__u32);
264 if (bufsize < (int) i)
265 return; /* no space for EA magic */
267 eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) +
272 attr_magic = ext2fs_swab32(attr_magic);
274 if (attr_magic != EXT2_EXT_ATTR_MAGIC)
275 return; /* it seems no magic here */
277 eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) +
279 *eat = ext2fs_swab32(*eaf);
282 ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1),
283 bufsize - sizeof(struct ext2_inode) -
284 extra_isize - sizeof(__u32), 0);
288 void ext2fs_swap_inode(ext2_filsys fs, struct ext2_inode *t,
289 struct ext2_inode *f, int hostorder)
291 ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) t,
292 (struct ext2_inode_large *) f, hostorder,
293 sizeof(struct ext2_inode));