#ifndef EXT4_TYPES_H_
#define EXT4_TYPES_H_
+#ifdef __cplusplus
+extern "C" {
+#endif
+
#include "ext4_config.h"
#include "ext4_blockdev.h"
#include "tree.h"
#define EXT4_CHECKSUM_CRC32C 1
+#define UUID_SIZE 16
+
/*
* Structure of the super block
*/
uint32_t features_compatible; /* Compatible feature set */
uint32_t features_incompatible; /* Incompatible feature set */
uint32_t features_read_only; /* Readonly-compatible feature set */
- uint8_t uuid[16]; /* 128-bit uuid for volume */
+ uint8_t uuid[UUID_SIZE]; /* 128-bit uuid for volume */
char volume_name[16]; /* Volume name */
char last_mounted[64]; /* Directory where last mounted */
uint32_t algorithm_usage_bitmap; /* For compression */
/*
* Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
*/
- uint8_t journal_uuid[16]; /* UUID of journal superblock */
+ uint8_t journal_uuid[UUID_SIZE]; /* UUID of journal superblock */
uint32_t journal_inode_number; /* Inode number of journal file */
uint32_t journal_dev; /* Device number of journal file */
uint32_t last_orphan; /* Head of list of inodes to delete */
#define EXT4_DIRECTORY_FILENAME_LEN 255
/**@brief Directory entry types. */
-enum { EXT4_DIRENTRY_UNKNOWN = 0,
- EXT4_DIRENTRY_REG_FILE,
- EXT4_DIRENTRY_DIR,
- EXT4_DIRENTRY_CHRDEV,
- EXT4_DIRENTRY_BLKDEV,
- EXT4_DIRENTRY_FIFO,
- EXT4_DIRENTRY_SOCK,
- EXT4_DIRENTRY_SYMLINK };
+enum { EXT4_DE_UNKNOWN = 0,
+ EXT4_DE_REG_FILE,
+ EXT4_DE_DIR,
+ EXT4_DE_CHRDEV,
+ EXT4_DE_BLKDEV,
+ EXT4_DE_FIFO,
+ EXT4_DE_SOCK,
+ EXT4_DE_SYMLINK };
#define EXT4_DIRENTRY_DIR_CSUM 0xDE
-union ext4_dir_entry_ll_internal {
+union ext4_dir_en_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
*/
-struct ext4_dir_entry_ll {
+struct ext4_dir_en {
uint32_t inode; /* I-node for the entry */
- uint16_t entry_length; /* Distance to the next directory entry */
- uint8_t name_length; /* Lower 8 bits of name length */
+ uint16_t entry_len; /* Distance to the next directory entry */
+ uint8_t name_len; /* Lower 8 bits of name length */
- union ext4_dir_entry_ll_internal in;
+ union ext4_dir_en_internal in;
uint8_t name[EXT4_DIRECTORY_FILENAME_LEN]; /* Entry name */
} __attribute__((packed));
-struct ext4_dir_iterator {
+struct ext4_dir_iter {
struct ext4_inode_ref *inode_ref;
- struct ext4_block current_block;
- uint64_t current_offset;
- struct ext4_dir_entry_ll *current;
+ struct ext4_block curr_blk;
+ uint64_t curr_off;
+ struct ext4_dir_en *curr;
};
struct ext4_dir_search_result {
struct ext4_block block;
- struct ext4_dir_entry_ll *dentry;
+ struct ext4_dir_en *dentry;
};
/* Structures for indexed directory */
uint16_t count;
};
-struct ext4_dir_idx_dot_entry {
+struct ext4_dir_idx_dot_en {
uint32_t inode;
uint16_t entry_length;
uint8_t name_length;
};
struct ext4_dir_idx_root {
- struct ext4_dir_idx_dot_entry dots[2];
+ struct ext4_dir_idx_dot_en dots[2];
struct ext4_dir_idx_rinfo info;
struct ext4_dir_idx_entry en[];
};
/*****************************************************************************/
+/*
+ * JBD stores integers in big endian.
+ */
+
+#define JBD_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */
+
+/*
+ * Descriptor block types:
+ */
+
+#define JBD_DESCRIPTOR_BLOCK 1
+#define JBD_COMMIT_BLOCK 2
+#define JBD_SUPERBLOCK 3
+#define JBD_SUPERBLOCK_V2 4
+#define JBD_REVOKE_BLOCK 5
+
+/*
+ * Standard header for all descriptor blocks:
+ */
+struct jbd_bhdr {
+ uint32_t magic;
+ uint32_t blocktype;
+ uint32_t sequence;
+};
+
+/*
+ * Checksum types.
+ */
+#define JBD_CRC32_CHKSUM 1
+#define JBD_MD5_CHKSUM 2
+#define JBD_SHA1_CHKSUM 3
+#define JBD_CRC32C_CHKSUM 4
+
+#define JBD_CRC32_CHKSUM_SIZE 4
+
+#define JBD_CHECKSUM_BYTES (32 / sizeof(uint32_t))
+/*
+ * Commit block header for storing transactional checksums:
+ *
+ * NOTE: If FEATURE_COMPAT_CHECKSUM (checksum v1) is set, the h_chksum*
+ * fields are used to store a checksum of the descriptor and data blocks.
+ *
+ * If FEATURE_INCOMPAT_CSUM_V2 (checksum v2) is set, then the h_chksum
+ * field is used to store crc32c(uuid+commit_block). Each journal metadata
+ * block gets its own checksum, and data block checksums are stored in
+ * journal_block_tag (in the descriptor). The other h_chksum* fields are
+ * not used.
+ *
+ * If FEATURE_INCOMPAT_CSUM_V3 is set, the descriptor block uses
+ * journal_block_tag3_t to store a full 32-bit checksum. Everything else
+ * is the same as v2.
+ *
+ * Checksum v1, v2, and v3 are mutually exclusive features.
+ */
+struct jbd_commit_header {
+ struct jbd_bhdr header;
+ uint8_t chksum_type;
+ uint8_t chksum_size;
+ uint8_t padding[2];
+ uint32_t chksum[JBD_CHECKSUM_BYTES];
+ uint64_t commit_sec;
+ uint32_t commit_nsec;
+};
+
+/*
+ * The block tag: used to describe a single buffer in the journal
+ */
+struct jbd_block_tag3 {
+ uint32_t blocknr; /* The on-disk block number */
+ uint32_t flags; /* See below */
+ uint32_t blocknr_high; /* most-significant high 32bits. */
+ uint32_t checksum; /* crc32c(uuid+seq+block) */
+};
+
+struct jbd_block_tag {
+ uint32_t blocknr; /* The on-disk block number */
+ uint16_t checksum; /* truncated crc32c(uuid+seq+block) */
+ uint16_t flags; /* See below */
+ uint32_t blocknr_high; /* most-significant high 32bits. */
+};
+
+/* Tail of descriptor block, for checksumming */
+struct jbd_block_tail {
+ uint32_t checksum;
+};
+
+/*
+ * The revoke descriptor: used on disk to describe a series of blocks to
+ * be revoked from the log
+ */
+struct jbd_revoke_header {
+ struct jbd_bhdr header;
+ uint32_t count; /* Count of bytes used in the block */
+};
+
+/* Tail of revoke block, for checksumming */
+struct jbd_revoke_tail {
+ uint32_t checksum;
+};
+
+#define JBD_USERS_MAX 48
+#define JBD_USERS_SIZE (UUID_SIZE * JBD_USERS_MAX)
+
+/*
+ * The journal superblock. All fields are in big-endian byte order.
+ */
+struct jbd_sb {
+/* 0x0000 */
+ struct jbd_bhdr header;
+
+/* 0x000C */
+ /* Static information describing the journal */
+ uint32_t blocksize; /* journal device blocksize */
+ uint32_t maxlen; /* total blocks in journal file */
+ uint32_t first; /* first block of log information */
+
+/* 0x0018 */
+ /* Dynamic information describing the current state of the log */
+ uint32_t sequence; /* first commit ID expected in log */
+ uint32_t start; /* blocknr of start of log */
+
+/* 0x0020 */
+ /* Error value, as set by journal_abort(). */
+ int32_t error_val;
+
+/* 0x0024 */
+ /* Remaining fields are only valid in a version-2 superblock */
+ uint32_t feature_compat; /* compatible feature set */
+ uint32_t feature_incompat; /* incompatible feature set */
+ uint32_t feature_ro_compat; /* readonly-compatible feature set */
+/* 0x0030 */
+ uint8_t uuid[UUID_SIZE]; /* 128-bit uuid for journal */
+
+/* 0x0040 */
+ uint32_t nr_users; /* Nr of filesystems sharing log */
+
+ uint32_t dynsuper; /* Blocknr of dynamic superblock copy*/
+
+/* 0x0048 */
+ uint32_t max_transaction; /* Limit of journal blocks per trans.*/
+ uint32_t max_trandata; /* Limit of data blocks per trans. */
+
+/* 0x0050 */
+ uint8_t checksum_type; /* checksum type */
+ uint8_t padding2[3];
+ uint32_t padding[42];
+ uint32_t checksum; /* crc32c(superblock) */
+
+/* 0x0100 */
+ uint8_t users[JBD_USERS_SIZE]; /* ids of all fs'es sharing the log */
+
+/* 0x0400 */
+};
+
+#define JBD_SUPERBLOCK_SIZE sizeof(struct jbd_sb)
+
+#define JBD_HAS_COMPAT_FEATURE(jsb,mask) \
+ ((jsb)->header.blocktype >= to_be32(2) && \
+ ((jsb)->feature_compat & to_be32((mask))))
+#define JBD_HAS_RO_COMPAT_FEATURE(jsb,mask) \
+ ((jsb)->header.blocktype >= to_be32(2) && \
+ ((jsb)->feature_ro_compat & to_be32((mask))))
+#define JBD_HAS_INCOMPAT_FEATURE(jsb,mask) \
+ ((jsb)->header.blocktype >= to_be32(2) && \
+ ((jsb)->feature_incompat & to_be32((mask))))
+
+#define JBD_FEATURE_COMPAT_CHECKSUM 0x00000001
+
+#define JBD_FEATURE_INCOMPAT_REVOKE 0x00000001
+#define JBD_FEATURE_INCOMPAT_64BIT 0x00000002
+#define JBD_FEATURE_INCOMPAT_ASYNC_COMMIT 0x00000004
+#define JBD_FEATURE_INCOMPAT_CSUM_V2 0x00000008
+#define JBD_FEATURE_INCOMPAT_CSUM_V3 0x00000010
+
+/* Features known to this kernel version: */
+#define JBD_KNOWN_COMPAT_FEATURES 0
+#define JBD_KNOWN_ROCOMPAT_FEATURES 0
+#define JBD_KNOWN_INCOMPAT_FEATURES (JBD_FEATURE_INCOMPAT_REVOKE|\
+ JBD_FEATURE_INCOMPAT_ASYNC_COMMIT|\
+ JBD_FEATURE_INCOMPAT_64BIT|\
+ JBD_FEATURE_INCOMPAT_CSUM_V2|\
+ JBD_FEATURE_INCOMPAT_CSUM_V3)
+
+struct jbd_fs {
+ /* If journal block device is used, bdev will be non-null */
+ struct ext4_blockdev *bdev;
+ struct ext4_inode_ref inode_ref;
+ struct jbd_sb sb;
+};
+
+/*****************************************************************************/
+
#define EXT4_CRC32_INIT (0xFFFFFFFFUL)
/*****************************************************************************/
return ((n & 0xff) << 8) | ((n & 0xff00) >> 8);
}
+#define to_be64(_n) _n
+#define to_be32(_n) _n
+#define to_be16(_n) _n
+
#else
#define to_le64(_n) _n
#define to_le32(_n) _n
#define to_le16(_n) _n
+
+static inline uint64_t to_be64(uint64_t n)
+{
+ return ((n & 0xff) << 56) | ((n & 0xff00) << 40) |
+ ((n & 0xff0000) << 24) | ((n & 0xff000000LL) << 8) |
+ ((n & 0xff00000000LL) >> 8) | ((n & 0xff0000000000LL) >> 24) |
+ ((n & 0xff000000000000LL) >> 40) |
+ ((n & 0xff00000000000000LL) >> 56);
+}
+
+static inline uint32_t to_be32(uint32_t n)
+{
+ return ((n & 0xff) << 24) | ((n & 0xff00) << 8) |
+ ((n & 0xff0000) >> 8) | ((n & 0xff000000) >> 24);
+}
+
+static inline uint16_t to_be16(uint16_t n)
+{
+ return ((n & 0xff) << 8) | ((n & 0xff00) >> 8);
+}
+
#endif
/****************************Access macros to ext4 structures*****************/
((size_t)(&(((type *)0)->field)))
#endif
+#ifdef __cplusplus
+}
+#endif
+
#endif /* EXT4_TYPES_H_ */
/**
projects / lwext4.git / blobdiff