A lot has changed in libext2fs since this header was last imported,
but most of it is irrelevant to simply reading files from ext2/3, so
only import the additional changes absolutely necessary for reading
from an ext4 filesystem.
Signed-off-by: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
---
ipl/ext2_fs.h | 42 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 41 insertions(+), 1 deletion(-)
diff --git a/ipl/ext2_fs.h b/ipl/ext2_fs.h
index 2d1db8f..f104880 100644
--- a/ipl/ext2_fs.h
+++ b/ipl/ext2_fs.h
@@ -504,7 +504,7 @@ struct ext2_super_block {
__u32 s_hash_seed[4]; /* HTREE hash seed */
__u8 s_def_hash_version; /* Default hash version to use */
__u8 s_jnl_backup_type; /* Default type of journal backup */
- __u16 s_reserved_word_pad;
+ __u16 s_desc_size;
__u32 s_default_mount_opts;
__u32 s_first_meta_bg; /* First metablock group */
__u32 s_mkfs_time; /* When the filesystem was created */
@@ -565,6 +565,8 @@ struct ext2_super_block {
#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040
+#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
+
#define EXT2_FEATURE_COMPAT_SUPP 0
@@ -643,4 +645,42 @@ struct ext2_dir_entry_2 {
#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
~EXT2_DIR_ROUND)
+/* from here we have additional structures from ext3_extents.h */
+
+/*
+ * this is extent on-disk structure
+ * it's used at the bottom of the tree
+ */
+struct ext3_extent {
+ __le32 ee_block; /* first logical block extent covers */
+ __le16 ee_len; /* number of blocks covered by extent */
+ __le16 ee_start_hi; /* high 16 bits of physical block */
+ __le32 ee_start; /* low 32 bigs of physical block */
+};
+
+/*
+ * this is index on-disk structure
+ * it's used at all the levels, but the bottom
+ */
+struct ext3_extent_idx {
+ __le32 ei_block; /* index covers logical blocks from 'block' */
+ __le32 ei_leaf; /* pointer to the physical block of the next *
+ * level. leaf or next index could bet here */
+ __le16 ei_leaf_hi; /* high 16 bits of physical block */
+ __le16 ei_unused;
+};
+
+/*
+ * each block (leaves and indexes), even inode-stored has header
+ */
+struct ext3_extent_header {
+ __le16 eh_magic; /* probably will support different formats */
+ __le16 eh_entries; /* number of valid entries */
+ __le16 eh_max; /* capacity of store in entries */
+ __le16 eh_depth; /* has tree real underlying blocks? */
+ __le32 eh_generation; /* generation of the tree */
+};
+
+#define EXT3_EXT_MAGIC 0xf30a
+
#endif /* _LINUX_EXT2_FS_H */
--
2.16.4
