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Merge pull request #39 from Matt8898/master 

Split ext2 and ext4 bgd
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mint 2020-09-29 22:48:04 +02:00 committed by GitHub
parent b775e08698 605879e860
commit b171d8fb02
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2 changed files with 29 additions and 8 deletions
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stage2/fs/ext2.c
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@ -98,6 +98,18 @@ struct ext2_bgd {
uint16_t bg_free_inodes_count;
uint16_t bg_dirs_count;
uint16_t reserved[7];
} __attribute__((packed));
struct ext4_bgd {
uint32_t bg_block_bitmap;
uint32_t bg_inode_bitmap;
uint32_t bg_inode_table;
uint16_t bg_free_blocks_count;
uint16_t bg_free_inodes_count;
uint16_t bg_dirs_count;
uint16_t pad;
uint32_t reserved[3];
uint32_t block_id_hi;
@ -168,17 +180,26 @@ static int ext2_get_inode(struct ext2_inode *ret, uint64_t drive, struct part *p
const uint64_t ino_tbl_idx = (inode - 1) % sb->s_inodes_per_group;
const uint64_t block_size = ((uint64_t)1024 << sb->s_log_block_size);
struct ext2_bgd target_descriptor;
uint64_t ino_offset;
const uint64_t bgd_start_offset = block_size >= 2048 ? block_size : block_size * 2;
const uint64_t bgd_offset = bgd_start_offset + (sizeof(struct ext2_bgd) * ino_blk_grp);
read_partition(drive, part, &target_descriptor, bgd_offset, sizeof(struct ext2_bgd));
const uint64_t ino_size = sb->s_rev_level == 0 ? sizeof(struct ext2_inode) : sb->s_inode_size;
const uint64_t ino_offset = ((target_descriptor.bg_inode_table | (bit64 ? ((uint64_t)target_descriptor.inode_id_hi << 32) : 0)) * block_size) +
(ino_size * ino_tbl_idx);
if (!bit64) {
struct ext2_bgd target_descriptor;
read_partition(drive, part, &target_descriptor, bgd_offset, sizeof(struct ext2_bgd));
ino_offset = ((target_descriptor.bg_inode_table) * block_size) +
(ino_size * ino_tbl_idx);
} else {
struct ext4_bgd target_descriptor;
read_partition(drive, part, &target_descriptor, bgd_offset, sizeof(struct ext4_bgd));
ino_offset = ((target_descriptor.bg_inode_table | (bit64 ? ((uint64_t)target_descriptor.inode_id_hi << 32) : 0)) * block_size) +
(ino_size * ino_tbl_idx);
}
read_partition(drive, part, ret, ino_offset, sizeof(struct ext2_inode));