ref: ee301d4abbb9e17aa0c0fdb0c750925da3e03305
dir: /lwext4/ext4_types.h/
/*
* Copyright (c) 2013 Grzegorz Kostka ([email protected])
*
*
* HelenOS:
* Copyright (c) 2012 Martin Sucha
* Copyright (c) 2012 Frantisek Princ
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup lwext4
* @{
*/
/**
* @file ext4_types.h
* @brief Ext4 data structure definitions.
*/
#ifndef EXT4_TYPES_H_
#define EXT4_TYPES_H_
#include <ext4_config.h>
#include <ext4_blockdev.h>
#include <stdint.h>
/*
* Structure of the super block
*/
struct ext4_sblock
{
uint32_t inodes_count; /* I-nodes count */
uint32_t blocks_count_lo; /* Blocks count */
uint32_t reserved_blocks_count_lo; /* Reserved blocks count */
uint32_t free_blocks_count_lo; /* Free blocks count */
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_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 */
uint32_t mount_time; /* Mount time */
uint32_t write_time; /* Write time */
uint16_t mount_count; /* Mount count */
uint16_t max_mount_count; /* Maximal mount count */
uint16_t magic; /* Magic signature */
uint16_t state; /* File system state */
uint16_t errors; /* Behaviour when detecting errors */
uint16_t minor_rev_level; /* Minor revision level */
uint32_t last_check_time; /* Time of last check */
uint32_t check_interval; /* Maximum time between checks */
uint32_t creator_os; /* Creator OS */
uint32_t rev_level; /* Revision level */
uint16_t def_resuid; /* Default uid for reserved blocks */
uint16_t def_resgid; /* Default gid for reserved blocks */
/* Fields for EXT4_DYNAMIC_REV superblocks only. */
uint32_t first_inode; /* First non-reserved inode */
uint16_t inode_size; /* Size of inode structure */
uint16_t block_group_index; /* Block group index of this superblock */
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 */
char volume_name[16]; /* Volume name */
char last_mounted[64]; /* Directory where last mounted */
uint32_t algorithm_usage_bitmap; /* For compression */
/*
* Performance hints. Directory preallocation should only
* happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
*/
uint8_t s_prealloc_blocks; /* Number of blocks to try to preallocate */
uint8_t s_prealloc_dir_blocks; /* Number to preallocate for dirs */
uint16_t s_reserved_gdt_blocks; /* Per group desc for online growth */
/*
* Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
*/
uint8_t journal_uuid[16]; /* 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 */
uint32_t hash_seed[4]; /* HTREE hash seed */
uint8_t default_hash_version; /* Default hash version to use */
uint8_t journal_backup_type;
uint16_t desc_size; /* Size of group descriptor */
uint32_t default_mount_opts; /* Default mount options */
uint32_t first_meta_bg; /* First metablock block group */
uint32_t mkfs_time; /* When the filesystem was created */
uint32_t journal_blocks[17]; /* Backup of the journal inode */
/* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
uint32_t blocks_count_hi; /* Blocks count */
uint32_t reserved_blocks_count_hi; /* Reserved blocks count */
uint32_t free_blocks_count_hi; /* Free blocks count */
uint16_t min_extra_isize; /* All inodes have at least # bytes */
uint16_t want_extra_isize; /* New inodes should reserve # bytes */
uint32_t flags; /* Miscellaneous flags */
uint16_t raid_stride; /* RAID stride */
uint16_t mmp_interval; /* # seconds to wait in MMP checking */
uint64_t mmp_block; /* Block for multi-mount protection */
uint32_t raid_stripe_width; /* Blocks on all data disks (N * stride) */
uint8_t log_groups_per_flex; /* FLEX_BG group size */
uint8_t reserved_char_pad;
uint16_t reserved_pad;
uint64_t kbytes_written; /* Number of lifetime kilobytes written */
uint32_t snapshot_inum; /* I-node number of active snapshot */
uint32_t snapshot_id; /* Sequential ID of active snapshot */
uint64_t snapshot_r_blocks_count; /* Reserved blocks for active snapshot's
future use */
uint32_t snapshot_list; /* I-node number of the head of the on-disk snapshot
list */
uint32_t error_count; /* Number of file system errors */
uint32_t first_error_time; /* First time an error happened */
uint32_t first_error_ino; /* I-node involved in first error */
uint64_t first_error_block; /* Block involved of first error */
uint8_t first_error_func[32]; /* Function where the error happened */
uint32_t first_error_line; /* Line number where error happened */
uint32_t last_error_time; /* Most recent time of an error */
uint32_t last_error_ino; /* I-node involved in last error */
uint32_t last_error_line; /* Line number where error happened */
uint64_t last_error_block; /* Block involved of last error */
uint8_t last_error_func[32]; /* Function where the error happened */
uint8_t mount_opts[64];
uint32_t padding[112]; /* Padding to the end of the block */
} __attribute__((packed));
#define EXT4_SUPERBLOCK_MAGIC 0xEF53
#define EXT4_SUPERBLOCK_SIZE 1024
#define EXT4_SUPERBLOCK_OFFSET 1024
#define EXT4_SUPERBLOCK_OS_LINUX 0
#define EXT4_SUPERBLOCK_OS_HURD 1
/*
* Misc. filesystem flags
*/
#define EXT4_SUPERBLOCK_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
#define EXT4_SUPERBLOCK_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use \
*/
#define EXT4_SUPERBLOCK_FLAGS_TEST_FILESYS 0x0004 /* to test development code \
*/
/*
* Filesystem states
*/
#define EXT4_SUPERBLOCK_STATE_VALID_FS 0x0001 /* Unmounted cleanly */
#define EXT4_SUPERBLOCK_STATE_ERROR_FS 0x0002 /* Errors detected */
#define EXT4_SUPERBLOCK_STATE_ORPHAN_FS 0x0004 /* Orphans being recovered */
/*
* Behaviour when errors detected
*/
#define EXT4_SUPERBLOCK_ERRORS_CONTINUE 1 /* Continue execution */
#define EXT4_SUPERBLOCK_ERRORS_RO 2 /* Remount fs read-only */
#define EXT4_SUPERBLOCK_ERRORS_PANIC 3 /* Panic */
#define EXT4_SUPERBLOCK_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
/*
* Compatible features
*/
#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
/*
* Read-only compatible features
*/
#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
#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_COMPRESSION 0x0001
#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
#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 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 EXT3_FEATURE_INCOMPAT_SUPP \
(EXT4_FEATURE_INCOMPAT_FILETYPE | EXT4_FEATURE_INCOMPAT_META_BG)
#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;
uint64_t inode_block_limits[4];
uint64_t inode_blocks_per_level[4];
uint32_t last_inode_bg_id;
};
#define EXT4_BLOCK_GROUP_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use \
*/
#define EXT4_BLOCK_GROUP_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
#define EXT4_BLOCK_GROUP_ITABLE_ZEROED \
0x0004 /* On-disk itable initialized to zero */
/*
* Structure of a blocks group descriptor
*/
struct ext4_bgroup
{
uint32_t block_bitmap_lo; /* Blocks bitmap block */
uint32_t inode_bitmap_lo; /* Inodes bitmap block */
uint32_t inode_table_first_block_lo; /* Inodes table block */
uint16_t free_blocks_count_lo; /* Free blocks count */
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 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) */
uint32_t block_bitmap_hi; /* Blocks bitmap block MSB */
uint32_t inode_bitmap_hi; /* I-nodes bitmap block MSB */
uint32_t inode_table_first_block_hi; /* I-nodes table block MSB */
uint16_t free_blocks_count_hi; /* Free blocks count MSB */
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 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;
};
#define EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE 32
#define EXT4_MAX_BLOCK_GROUP_DESCRIPTOR_SIZE 64
#define EXT4_MIN_BLOCK_SIZE 1024 /* 1 KiB */
#define EXT4_MAX_BLOCK_SIZE 65536 /* 64 KiB */
#define EXT4_REV0_INODE_SIZE 128
#define EXT4_INODE_BLOCK_SIZE 512
#define EXT4_INODE_DIRECT_BLOCK_COUNT 12
#define EXT4_INODE_INDIRECT_BLOCK EXT4_INODE_DIRECT_BLOCK_COUNT
#define EXT4_INODE_DOUBLE_INDIRECT_BLOCK (EXT4_INODE_INDIRECT_BLOCK + 1)
#define EXT4_INODE_TRIPPLE_INDIRECT_BLOCK (EXT4_INODE_DOUBLE_INDIRECT_BLOCK + 1)
#define EXT4_INODE_BLOCKS (EXT4_INODE_TRIPPLE_INDIRECT_BLOCK + 1)
#define EXT4_INODE_INDIRECT_BLOCK_COUNT \
(EXT4_INODE_BLOCKS - EXT4_INODE_DIRECT_BLOCK_COUNT)
/*
* Structure of an inode on the disk
*/
struct ext4_inode
{
uint16_t mode; /* File mode */
uint16_t uid; /* Low 16 bits of owner uid */
uint32_t size_lo; /* Size in bytes */
uint32_t access_time; /* Access time */
uint32_t change_inode_time; /* I-node change time */
uint32_t modification_time; /* Modification time */
uint32_t deletion_time; /* Deletion time */
uint16_t gid; /* Low 16 bits of group id */
uint16_t links_count; /* Links count */
uint32_t blocks_count_lo; /* Blocks count */
uint32_t flags; /* File flags */
uint32_t unused_osd1; /* OS dependent - not used in HelenOS */
uint32_t blocks[EXT4_INODE_BLOCKS]; /* Pointers to blocks */
uint32_t generation; /* File version (for NFS) */
uint32_t file_acl_lo; /* File ACL */
uint32_t size_hi;
uint32_t obso_faddr; /* Obsoleted fragment address */
union
{
struct
{
uint16_t blocks_high;
uint16_t file_acl_high;
uint16_t uid_high;
uint16_t gid_high;
uint32_t reserved2;
} linux2;
struct
{
uint16_t reserved1;
uint16_t mode_high;
uint16_t uid_high;
uint16_t gid_high;
uint32_t author;
} hurd2;
} __attribute__((packed)) osd2;
uint16_t extra_isize;
uint16_t pad1;
uint32_t ctime_extra; /* Extra change time (nsec << 2 | epoch) */
uint32_t mtime_extra; /* Extra Modification time (nsec << 2 | epoch) */
uint32_t atime_extra; /* Extra Access time (nsec << 2 | epoch) */
uint32_t crtime; /* File creation time */
uint32_t crtime_extra; /* Extra file creation time (nsec << 2 | epoch) */
uint32_t version_hi; /* High 32 bits for 64-bit version */
} __attribute__((packed));
#define EXT4_INODE_MODE_FIFO 0x1000
#define EXT4_INODE_MODE_CHARDEV 0x2000
#define EXT4_INODE_MODE_DIRECTORY 0x4000
#define EXT4_INODE_MODE_BLOCKDEV 0x6000
#define EXT4_INODE_MODE_FILE 0x8000
#define EXT4_INODE_MODE_SOFTLINK 0xA000
#define EXT4_INODE_MODE_SOCKET 0xC000
#define EXT4_INODE_MODE_TYPE_MASK 0xF000
/*
* Inode flags
*/
#define EXT4_INODE_FLAG_SECRM 0x00000001 /* Secure deletion */
#define EXT4_INODE_FLAG_UNRM 0x00000002 /* Undelete */
#define EXT4_INODE_FLAG_COMPR 0x00000004 /* Compress file */
#define EXT4_INODE_FLAG_SYNC 0x00000008 /* Synchronous updates */
#define EXT4_INODE_FLAG_IMMUTABLE 0x00000010 /* Immutable file */
#define EXT4_INODE_FLAG_APPEND 0x00000020 /* writes to file may only append */
#define EXT4_INODE_FLAG_NODUMP 0x00000040 /* do not dump file */
#define EXT4_INODE_FLAG_NOATIME 0x00000080 /* do not update atime */
/* Compression flags */
#define EXT4_INODE_FLAG_DIRTY 0x00000100
#define EXT4_INODE_FLAG_COMPRBLK \
0x00000200 /* One or more compressed clusters */
#define EXT4_INODE_FLAG_NOCOMPR 0x00000400 /* Don't compress */
#define EXT4_INODE_FLAG_ECOMPR 0x00000800 /* Compression error */
#define EXT4_INODE_FLAG_INDEX 0x00001000 /* hash-indexed directory */
#define EXT4_INODE_FLAG_IMAGIC 0x00002000 /* AFS directory */
#define EXT4_INODE_FLAG_JOURNAL_DATA \
0x00004000 /* File data should be journaled */
#define EXT4_INODE_FLAG_NOTAIL 0x00008000 /* File tail should not be merged */
#define EXT4_INODE_FLAG_DIRSYNC \
0x00010000 /* Dirsync behaviour (directories only) */
#define EXT4_INODE_FLAG_TOPDIR 0x00020000 /* Top of directory hierarchies */
#define EXT4_INODE_FLAG_HUGE_FILE 0x00040000 /* Set to each huge file */
#define EXT4_INODE_FLAG_EXTENTS 0x00080000 /* Inode uses extents */
#define EXT4_INODE_FLAG_EA_INODE 0x00200000 /* Inode used for large EA */
#define EXT4_INODE_FLAG_EOFBLOCKS 0x00400000 /* Blocks allocated beyond EOF */
#define EXT4_INODE_FLAG_RESERVED 0x80000000 /* reserved for ext4 lib */
#define EXT4_INODE_ROOT_INDEX 2
struct ext4_inode_ref
{
struct ext4_block block;
struct ext4_inode *inode;
struct ext4_fs *fs;
uint32_t index;
bool dirty;
};
#define EXT4_DIRECTORY_FILENAME_LEN 255
#define EXT4_DIRECTORY_FILETYPE_UNKNOWN 0
#define EXT4_DIRECTORY_FILETYPE_REG_FILE 1
#define EXT4_DIRECTORY_FILETYPE_DIR 2
#define EXT4_DIRECTORY_FILETYPE_CHRDEV 3
#define EXT4_DIRECTORY_FILETYPE_BLKDEV 4
#define EXT4_DIRECTORY_FILETYPE_FIFO 5
#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
*/
struct ext4_directory_entry_ll
{
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 */
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_directory_entry_ll *current;
};
struct ext4_directory_search_result
{
struct ext4_block block;
struct ext4_directory_entry_ll *dentry;
};
/* Structures for indexed directory */
struct ext4_directory_dx_countlimit
{
uint16_t limit;
uint16_t count;
};
struct ext4_directory_dx_dot_entry
{
uint32_t inode;
uint16_t entry_length;
uint8_t name_length;
uint8_t inode_type;
uint8_t name[4];
};
struct ext4_directory_dx_root_info
{
uint32_t reserved_zero;
uint8_t hash_version;
uint8_t info_length;
uint8_t indirect_levels;
uint8_t unused_flags;
};
struct ext4_directory_dx_entry
{
uint32_t hash;
uint32_t block;
};
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[];
};
struct ext4_fake_directory_entry
{
uint32_t inode;
uint16_t entry_length;
uint8_t name_length;
uint8_t inode_type;
};
struct ext4_directory_dx_node
{
struct ext4_fake_directory_entry fake;
struct ext4_directory_dx_entry entries[];
};
struct ext4_directory_dx_block
{
struct ext4_block block;
struct ext4_directory_dx_entry *entries;
struct ext4_directory_dx_entry *position;
};
#define EXT4_ERR_BAD_DX_DIR (-25000)
#define EXT4_LINK_MAX 65000
/*
* This is the extent on-disk structure.
* It's used at the bottom of the tree.
*/
struct ext4_extent
{
uint32_t first_block; /* First logical block extent covers */
uint16_t block_count; /* Number of blocks covered by extent */
uint16_t start_hi; /* High 16 bits of physical block */
uint32_t start_lo; /* Low 32 bits of physical block */
};
/*
* This is index on-disk structure.
* It's used at all the levels except the bottom.
*/
struct ext4_extent_index
{
uint32_t first_block; /* Index covers logical blocks from 'block' */
/**
* Pointer to the physical block of the next
* level. leaf or next index could be there
* high 16 bits of physical block
*/
uint32_t leaf_lo;
uint16_t leaf_hi;
uint16_t padding;
};
/*
* Each block (leaves and indexes), even inode-stored has header.
*/
struct ext4_extent_header
{
uint16_t magic;
uint16_t entries_count; /* Number of valid entries */
uint16_t max_entries_count; /* Capacity of store in entries */
uint16_t depth; /* Has tree real underlying blocks? */
uint32_t generation; /* generation of the tree */
};
struct ext4_extent_path
{
struct ext4_block block;
uint16_t depth;
struct ext4_extent_header *header;
struct ext4_extent_index *index;
struct ext4_extent *extent;
};
#define EXT4_EXTENT_MAGIC 0xF30A
#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 *)(((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_EOF 0x7FFFFFFFUL
struct ext4_hash_info
{
uint32_t hash;
uint32_t minor_hash;
uint32_t hash_version;
const uint32_t *seed;
};
/*****************************************************************************/
#ifdef CONFIG_BIG_ENDIAN
static inline uint64_t to_le64(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_le32(uint32_t n)
{
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) | ((n & 0xff00) >> 8);
}
#else
#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_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_ */
/**
* @}
*/