ext2_superblock Struct Reference

The superblock, as it is on the disk, 1024 bytes into it. More...

#include <ext2.h>

Data Fields
uint32_t	ninodes
	number of inodes
uint32_t	nblocks
	number of blocks
uint32_t	nrblocks
	number of reserved blocks
uint32_t	free_blocks
	number of unallocated blocks
uint32_t	free_inodes
	number of unallocated inodes
uint32_t	dblock
	first data block
uint32_t	block_size
	log(block size)
uint32_t	frag_size
	log(fragment size)
uint32_t	gblocks
	number of blocks per block group
uint32_t	gfrags
	number of fragments per block group
uint32_t	ginodes
	number of inodes per block group
uint32_t	mtime
	last mount time
uint32_t	wtime
	last write time
uint16_t	times_mounted
uint16_t	allowed_times_mounted
uint16_t	ext2_signature
uint16_t	filesystem_state
uint16_t	on_error
uint16_t	minor_version
uint32_t	last_fsck
uint32_t	time_between_fsck
uint32_t	os_id
uint32_t	major_version
uint16_t	uid
uint16_t	gid
uint32_t	first_non_reserved_inode
uint16_t	inode_size
uint16_t	sb_block_group
uint32_t	feature_compat
uint32_t	feature_incompat
uint32_t	feature_ro_compat
uint8_t	fsid [16]
uint8_t	name [16]
uint8_t	path_last_mounted_to [64]
uint32_t	compression_algorithms
uint8_t	blocks_to_preallocate_for_files
uint8_t	blocks_to_preallocate_for_directories
uint16_t	__unused__
uint8_t	jid [16]
uint32_t	jinode
uint32_t	jdevice
uint32_t	head_of_orphan_inode_list

Detailed Description

The superblock, as it is on the disk, 1024 bytes into it.

Definition at line 34 of file ext2.h.

Field Documentation

__unused__

uint16_t ext2_superblock::__unused__

Definition at line 90 of file ext2.h.

allowed_times_mounted

uint16_t ext2_superblock::allowed_times_mounted

Definition at line 63 of file ext2.h.

block_size

uint32_t ext2_superblock::block_size

log(block size)

Definition at line 48 of file ext2.h.

Referenced by ext2_load().

blocks_to_preallocate_for_directories

uint8_t ext2_superblock::blocks_to_preallocate_for_directories

Definition at line 89 of file ext2.h.

blocks_to_preallocate_for_files

uint8_t ext2_superblock::blocks_to_preallocate_for_files

Definition at line 88 of file ext2.h.

compression_algorithms

uint32_t ext2_superblock::compression_algorithms

Definition at line 87 of file ext2.h.

dblock

uint32_t ext2_superblock::dblock

first data block

Definition at line 46 of file ext2.h.

Referenced by ext2_block_alloc(), and ext2_block_free().

ext2_signature

uint16_t ext2_superblock::ext2_signature

Definition at line 64 of file ext2.h.

Referenced by ext2_load().

feature_compat

uint32_t ext2_superblock::feature_compat

Definition at line 80 of file ext2.h.

feature_incompat

uint32_t ext2_superblock::feature_incompat

Definition at line 81 of file ext2.h.

Referenced by ext2_load().

feature_ro_compat

uint32_t ext2_superblock::feature_ro_compat

Definition at line 82 of file ext2.h.

Referenced by ext2_load().

filesystem_state

uint16_t ext2_superblock::filesystem_state

Definition at line 65 of file ext2.h.

first_non_reserved_inode

uint32_t ext2_superblock::first_non_reserved_inode

Definition at line 76 of file ext2.h.

frag_size

uint32_t ext2_superblock::frag_size

log(fragment size)

Definition at line 50 of file ext2.h.

free_blocks

uint32_t ext2_superblock::free_blocks

number of unallocated blocks

Definition at line 42 of file ext2.h.

Referenced by ext2_block_alloc(), and ext2_block_free().

free_inodes

uint32_t ext2_superblock::free_inodes

number of unallocated inodes

Definition at line 44 of file ext2.h.

Referenced by ext2_inode_alloc(), and ext2_inode_free().

fsid

uint8_t ext2_superblock::fsid[16]

Definition at line 84 of file ext2.h.

gblocks

uint32_t ext2_superblock::gblocks

number of blocks per block group

Definition at line 52 of file ext2.h.

Referenced by ext2_block_alloc(), ext2_block_free(), and ext2_load().

gfrags

uint32_t ext2_superblock::gfrags

number of fragments per block group

Definition at line 54 of file ext2.h.

gid

uint16_t ext2_superblock::gid

Definition at line 73 of file ext2.h.

ginodes

uint32_t ext2_superblock::ginodes

number of inodes per block group

Definition at line 56 of file ext2.h.

Referenced by ext2_inode_alloc(), ext2_inode_free(), ext2_inode_off(), and ext2_vmknod().

head_of_orphan_inode_list

uint32_t ext2_superblock::head_of_orphan_inode_list

Definition at line 94 of file ext2.h.

inode_size

uint16_t ext2_superblock::inode_size

Definition at line 77 of file ext2.h.

Referenced by ext2_load().

jdevice

uint32_t ext2_superblock::jdevice

Definition at line 93 of file ext2.h.

jid

uint8_t ext2_superblock::jid[16]

Definition at line 91 of file ext2.h.

jinode

uint32_t ext2_superblock::jinode

Definition at line 92 of file ext2.h.

last_fsck

uint32_t ext2_superblock::last_fsck

Definition at line 68 of file ext2.h.

major_version

uint32_t ext2_superblock::major_version

Definition at line 71 of file ext2.h.

Referenced by ext2_load().

minor_version

uint16_t ext2_superblock::minor_version

Definition at line 67 of file ext2.h.

mtime

uint32_t ext2_superblock::mtime

last mount time

Definition at line 58 of file ext2.h.

name

uint8_t ext2_superblock::name[16]

Definition at line 85 of file ext2.h.

nblocks

uint32_t ext2_superblock::nblocks

number of blocks

Definition at line 38 of file ext2.h.

Referenced by ext2_block_free(), and ext2_load().

ninodes

uint32_t ext2_superblock::ninodes

number of inodes

Definition at line 36 of file ext2.h.

Referenced by ext2_inode_off().

nrblocks

uint32_t ext2_superblock::nrblocks

number of reserved blocks

Definition at line 40 of file ext2.h.

on_error

uint16_t ext2_superblock::on_error

Definition at line 66 of file ext2.h.

os_id

uint32_t ext2_superblock::os_id

Definition at line 70 of file ext2.h.

path_last_mounted_to

uint8_t ext2_superblock::path_last_mounted_to[64]

Definition at line 86 of file ext2.h.

sb_block_group

uint16_t ext2_superblock::sb_block_group

Definition at line 78 of file ext2.h.

time_between_fsck

uint32_t ext2_superblock::time_between_fsck

Definition at line 69 of file ext2.h.

times_mounted

uint16_t ext2_superblock::times_mounted

Definition at line 62 of file ext2.h.

uid

uint16_t ext2_superblock::uid

Definition at line 72 of file ext2.h.

wtime

uint32_t ext2_superblock::wtime

last write time

Definition at line 60 of file ext2.h.

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The documentation for this struct was generated from the following file:

• kernel/fs/ext2/ext2.h