Add macros to support variable-length group descriptors for ext4.
Signed-off-by: Valerie Clement <valerie.clement@bull.net>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
super_blk = group_block;
numblocks--;
}
- meta_bg_size = (fs->blocksize / sizeof (struct ext2_group_desc));
+ meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
meta_bg = group / meta_bg_size;
if (!(fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) ||
/*
* Macro-instructions used to manage group descriptors
*/
+#define EXT2_MIN_DESC_SIZE 32
+#define EXT2_MIN_DESC_SIZE_64BIT 64
+#define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE
+#define EXT2_DESC_SIZE(s) \
+ ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \
+ (s)->s_desc_size : EXT2_MIN_DESC_SIZE)
+
#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s))
#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block)
#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
#else
-#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
+#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s))
#endif
/*
{
struct ext2_super_block *sb = fs->super;
unsigned long bpg = sb->s_blocks_per_group;
- unsigned int gdpb = fs->blocksize / sizeof(struct ext2_group_desc);
+ unsigned int gdpb = EXT2_DESC_PER_BLOCK(sb);
unsigned long max_blocks = 0xffffffff;
unsigned long rsv_groups;
unsigned int rsv_gdb;
(i < fs->super->s_first_meta_bg))
return (group_block + i + 1);
- bg = (fs->blocksize / sizeof (struct ext2_group_desc)) * i;
+ bg = EXT2_DESC_PER_BLOCK(fs->super) * i;
if (ext2fs_bg_has_super(fs, bg))
has_super = 1;
ret_blk = ext2fs_group_first_block(fs, bg) + has_super;
if (!group_block)
group_block = fs->super->s_first_data_block;
dest = (char *) fs->group_desc;
- groups_per_block = fs->blocksize / sizeof(struct ext2_group_desc);
+ groups_per_block = EXT2_DESC_PER_BLOCK(fs->super);
for (i=0 ; i < fs->desc_blocks; i++) {
blk = ext2fs_descriptor_block_loc(fs, group_block, i);
retval = io_channel_read_blk(fs->io, blk, 1, dest);
if (s->s_reserved_gdt_blocks)
printf(_("Maximum filesystem blocks=%lu\n"),
(s->s_reserved_gdt_blocks + fs->desc_blocks) *
- (fs->blocksize / sizeof(struct ext2_group_desc)) *
- s->s_blocks_per_group);
+ EXT2_DESC_PER_BLOCK(s) * s->s_blocks_per_group);
if (fs->group_desc_count > 1)
printf(_("%u block groups\n"), fs->group_desc_count);
else
bpg = param->s_blocks_per_group;
if (!bpg)
bpg = blocksize * 8;
- gdpb = blocksize / sizeof(struct ext2_group_desc);
+ gdpb = EXT2_DESC_PER_BLOCK(param);
group_desc_count =
ext2fs_div_ceil(param->s_blocks_count, bpg);
desc_blocks = (group_desc_count +
ext2fs_mark_block_bitmap(fs->block_map, group_block);
adjblocks++;
}
- meta_bg_size = (fs->blocksize /
- sizeof (struct ext2_group_desc));
+ meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
meta_bg = i / meta_bg_size;
if (!(fs->super->s_feature_incompat &
EXT2_FEATURE_INCOMPAT_META_BG) ||
unsigned long meta_bg_size;
unsigned int old_desc_blocks;
- meta_bg_size = (fs->blocksize / sizeof (struct ext2_group_desc));
+ meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
old_desc_blocks = fs->super->s_first_meta_bg;
else
* If we're increasing the number of descriptor blocks, life
* gets interesting....
*/
- meta_bg_size = (fs->blocksize / sizeof (struct ext2_group_desc));
+ meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
for (i = 0; i < max_groups; i++) {
has_super = ext2fs_bg_has_super(fs, i);
if (has_super)