uint32_t free_inodes_count; /* Free inodes count */
uint32_t first_data_block; /* First Data Block */
uint32_t log_block_size; /* Block size */
- uint32_t log_frag_size; /* Obsoleted fragment size */
+ uint32_t log_cluster_size; /* Obsoleted fragment size */
uint32_t blocks_per_group; /* Number of blocks per group */
uint32_t frags_per_group; /* Obsoleted fragments per group */
uint32_t inodes_per_group; /* Number of inodes per group */
#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
+
/*
* Read-only compatible features
*/
#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
+#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
+#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
+#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
/*
* Incompatible features
#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
+#define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
+#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
+#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
+
+
+/*
+ * EXT2 supported feature set
+ */
+#define EXT2_FEATURE_COMPAT_SUPP 0x0000
-#define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_DIR_INDEX)
+#define EXT2_FEATURE_INCOMPAT_SUPP \
+ (EXT4_FEATURE_INCOMPAT_FILETYPE | \
+ EXT4_FEATURE_INCOMPAT_META_BG)
+
+#define EXT2_FEATURE_RO_COMPAT_SUPP \
+ (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER | \
+ EXT4_FEATURE_RO_COMPAT_LARGE_FILE | \
+ EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
+
+/*
+ * EXT3 supported feature set
+ */
+#define EXT3_FEATURE_COMPAT_SUPP \
+ (EXT4_FEATURE_COMPAT_DIR_INDEX)
-#define EXT4_FEATURE_INCOMPAT_SUPP \
- (EXT4_FEATURE_INCOMPAT_FILETYPE | \
- EXT4_FEATURE_INCOMPAT_EXTENTS | \
- EXT4_FEATURE_INCOMPAT_64BIT)
+#define EXT3_FEATURE_INCOMPAT_SUPP \
+ (EXT4_FEATURE_INCOMPAT_FILETYPE | \
+ EXT4_FEATURE_INCOMPAT_META_BG)
-#define EXT4_FEATURE_RO_COMPAT_SUPP \
- (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER | \
- EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
- EXT4_FEATURE_RO_COMPAT_HUGE_FILE | \
- EXT4_FEATURE_RO_COMPAT_LARGE_FILE | \
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM | \
- EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)
+#define EXT3_FEATURE_RO_COMPAT_SUPP \
+ (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER | \
+ EXT4_FEATURE_RO_COMPAT_LARGE_FILE | \
+ EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
+
+/*
+ * EXT4 supported feature set
+ */
+#define EXT4_FEATURE_COMPAT_SUPP \
+ (EXT4_FEATURE_COMPAT_DIR_INDEX)
+
+#define EXT4_FEATURE_INCOMPAT_SUPP \
+ (EXT4_FEATURE_INCOMPAT_FILETYPE | \
+ EXT4_FEATURE_INCOMPAT_META_BG | \
+ EXT4_FEATURE_INCOMPAT_EXTENTS | \
+ EXT4_FEATURE_INCOMPAT_FLEX_BG | \
+ EXT4_FEATURE_INCOMPAT_64BIT)
+
+#define EXT4_FEATURE_RO_COMPAT_SUPP \
+ (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER | \
+ EXT4_FEATURE_RO_COMPAT_LARGE_FILE | \
+ EXT4_FEATURE_RO_COMPAT_GDT_CSUM | \
+ EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
+ EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
+ EXT4_FEATURE_RO_COMPAT_BTREE_DIR | \
+ EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
+
+
+/*Ignored features:
+ * RECOVER - journaling in lwext4 is not supported
+ * (probably won,t be ever...)
+ * MMP - multi mout protection (impossible scenario)
+ * */
+#define FEATURE_INCOMPAT_IGNORED \
+ EXT4_FEATURE_INCOMPAT_RECOVER | \
+ EXT4_FEATURE_INCOMPAT_MMP
+
+#if 0
+/*TODO: Features incompatible to implement*/
+#define EXT4_FEATURE_INCOMPAT_SUPP
+ (EXT4_FEATURE_INCOMPAT_INLINE_DATA)
+
+/*TODO: Features read only to implement*/
+#define EXT4_FEATURE_RO_COMPAT_SUPP
+ EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
+ EXT4_FEATURE_RO_COMPAT_QUOTA)
+#endif
struct ext4_fs {
- struct ext4_blockdev *bdev;
- struct ext4_sblock sb;
+ struct ext4_blockdev*bdev;
+ struct ext4_sblock sb;
uint64_t inode_block_limits[4];
uint64_t inode_blocks_per_level[4];
uint16_t free_inodes_count_lo; /* Free inodes count */
uint16_t used_dirs_count_lo; /* Directories count */
uint16_t flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
- uint32_t reserved[2]; /* Likely block/inode bitmap checksum */
+ uint32_t exclude_bitmap_lo; /* Exclude bitmap for snapshots */
+ uint16_t block_bitmap_csum_lo; /* crc32c(s_uuid+grp_num+bbitmap) LE */
+ uint16_t inode_bitmap_csum_lo; /* crc32c(s_uuid+grp_num+ibitmap) LE */
uint16_t itable_unused_lo; /* Unused inodes count */
uint16_t checksum; /* crc16(sb_uuid+group+desc) */
uint16_t free_inodes_count_hi; /* Free i-nodes count MSB */
uint16_t used_dirs_count_hi; /* Directories count MSB */
uint16_t itable_unused_hi; /* Unused inodes count MSB */
- uint32_t reserved2[3]; /* Padding */
+ uint32_t exclude_bitmap_hi; /* Exclude bitmap block MSB */
+ uint16_t block_bitmap_csum_hi; /* crc32c(s_uuid+grp_num+bbitmap) BE */
+ uint16_t inode_bitmap_csum_hi; /* crc32c(s_uuid+grp_num+ibitmap) BE */
+ uint32_t reserved; /* Padding */
} ;
struct ext4_block_group_ref {
- struct ext4_block block;
- struct ext4_bgroup *block_group;
- struct ext4_fs *fs;
- uint32_t index;
- bool dirty;
+ struct ext4_block block;
+ struct ext4_bgroup *block_group;
+ struct ext4_fs *fs;
+ uint32_t index;
+ bool dirty;
};
#define EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE 32
#define EXT4_INODE_ROOT_INDEX 2
struct ext4_inode_ref {
- struct ext4_block block;
- struct ext4_inode *inode;
+ struct ext4_block block;
+ struct ext4_inode *inode;
struct ext4_fs *fs;
uint32_t index;
bool dirty;
#define EXT4_DIRECTORY_FILETYPE_SOCK 6
#define EXT4_DIRECTORY_FILETYPE_SYMLINK 7
+union ext4_directory_entry_ll_internal{
+ uint8_t name_length_high; /* Higher 8 bits of name length */
+ uint8_t inode_type; /* Type of referenced inode (in rev >= 0.5) */
+} __attribute__ ((packed));
+
/**
* Linked list directory entry structure
*/
uint16_t entry_length; /* Distance to the next directory entry */
uint8_t name_length; /* Lower 8 bits of name length */
- union {
- uint8_t name_length_high; /* Higher 8 bits of name length */
- uint8_t inode_type; /* Type of referenced inode (in rev >= 0.5) */
- } __attribute__ ((packed));
+ union ext4_directory_entry_ll_internal in;
uint8_t name[EXT4_DIRECTORY_FILENAME_LEN]; /* Entry name */
} __attribute__((packed)) ;
struct ext4_directory_iterator {
- struct ext4_inode_ref *inode_ref;
- struct ext4_block current_block;
- uint64_t current_offset;
+ struct ext4_inode_ref *inode_ref;
+ struct ext4_block current_block;
+ uint64_t current_offset;
struct ext4_directory_entry_ll *current;
};
struct ext4_directory_search_result {
- struct ext4_block block;
- struct ext4_directory_entry_ll *dentry;
+ struct ext4_block block;
+ struct ext4_directory_entry_ll *dentry;
};
/* Structures for indexed directory */
struct ext4_directory_dx_root {
struct ext4_directory_dx_dot_entry dots[2];
struct ext4_directory_dx_root_info info;
- struct ext4_directory_dx_entry entries[0];
+ struct ext4_directory_dx_entry entries[];
};
struct ext4_fake_directory_entry {
struct ext4_directory_dx_node {
struct ext4_fake_directory_entry fake;
- struct ext4_directory_dx_entry entries[0];
+ struct ext4_directory_dx_entry entries[];
};
struct ext4_directory_dx_block {
- struct ext4_block block;
+ struct ext4_block block;
struct ext4_directory_dx_entry *entries;
struct ext4_directory_dx_entry *position;
} ;
-#define EXT4_ERR_BAD_DX_DIR (-75000)
+#define EXT4_ERR_BAD_DX_DIR (-25000)
+#define EXT4_LINK_MAX 65000
/*
* This is the extent on-disk structure.
} ;
struct ext4_extent_path {
- struct ext4_block block;
- uint16_t depth;
+ struct ext4_block block;
+ uint16_t depth;
struct ext4_extent_header *header;
- struct ext4_extent_index *index;
- struct ext4_extent *extent;
+ struct ext4_extent_index *index;
+ struct ext4_extent *extent;
} ;
#define EXT4_EXTENT_MAGIC 0xF30A
-#define EXT4_EXTENT_FIRST(header) \
- ((struct ext4_extent *) (((void *) (header)) + sizeof(struct ext4_extent_header)))
+#define EXT4_EXTENT_FIRST(header) \
+ ((struct ext4_extent *) (((char *) (header)) + sizeof(struct ext4_extent_header)))
-#define EXT4_EXTENT_FIRST_INDEX(header) \
- ((struct ext4_extent_index *) (((void *) (header)) + sizeof(struct ext4_extent_header)))
+#define EXT4_EXTENT_FIRST_INDEX(header) \
+ ((struct ext4_extent_index *) (((char *) (header)) + sizeof(struct ext4_extent_header)))
/* EXT3 HTree directory indexing */
-#define EXT2_HTREE_LEGACY 0
-#define EXT2_HTREE_HALF_MD4 1
-#define EXT2_HTREE_TEA 2
-#define EXT2_HTREE_LEGACY_UNSIGNED 3
-#define EXT2_HTREE_HALF_MD4_UNSIGNED 4
-#define EXT2_HTREE_TEA_UNSIGNED 5
+#define EXT2_HTREE_LEGACY 0
+#define EXT2_HTREE_HALF_MD4 1
+#define EXT2_HTREE_TEA 2
+#define EXT2_HTREE_LEGACY_UNSIGNED 3
+#define EXT2_HTREE_HALF_MD4_UNSIGNED 4
+#define EXT2_HTREE_TEA_UNSIGNED 5
-#define EXT2_HTREE_EOF 0x7FFFFFFF
+#define EXT2_HTREE_EOF 0x7FFFFFFFUL
struct ext4_hash_info {
static inline uint32_t to_le32(uint32_t n)
{
- return ((n & 0xff) << 24) |
+ return ((n & 0xff) << 24) |
((n & 0xff00) << 8) |
((n & 0xff0000) >> 8) |
((n & 0xff000000) >> 24);
static inline uint16_t to_le16(uint16_t n)
{
- return ((n & 0xff) << 8) |
+ return ((n & 0xff) << 8) |
((n & 0xff00) >> 8);
}
#else
-#define to_le64(_n) _n
-#define to_le32(_n) _n
-#define to_le16(_n) _n
+#define to_le64(_n) _n
+#define to_le32(_n) _n
+#define to_le16(_n) _n
#endif
/****************************Access macros to ext4 structures*****************/
-#define ext4_get32(s, f) to_le32((s)->f)
-#define ext4_get16(s, f) to_le16((s)->f)
-#define ext4_get8(s, f) (s)->f
+#define ext4_get32(s, f) to_le32((s)->f)
+#define ext4_get16(s, f) to_le16((s)->f)
+#define ext4_get8(s, f) (s)->f
-#define ext4_set32(s, f, v) do { (s)->f = to_le32(v); }while(0)
-#define ext4_set16(s, f, v) do { (s)->f = to_le16(v); }while(0)
-#define ext4_set8 (s, f, v) do { (s)->f = (v); }while(0)
+#define ext4_set32(s, f, v) do { (s)->f = to_le32(v); }while(0)
+#define ext4_set16(s, f, v) do { (s)->f = to_le16(v); }while(0)
+#define ext4_set8 (s, f, v) do { (s)->f = (v); }while(0)
#endif /* EXT4_TYPES_H_ */
projects / lwext4.git / blobdiff