19f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
29f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o *  linux/include/linux/ext2_fs.h
39f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o *
49f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Copyright (C) 1992, 1993, 1994, 1995
59f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Remy Card (card@masi.ibp.fr)
69f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Laboratoire MASI - Institut Blaise Pascal
79f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Universite Pierre et Marie Curie (Paris VI)
89f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o *
99f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o *  from
109f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o *
119f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o *  linux/include/linux/minix_fs.h
129f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o *
139f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o *  Copyright (C) 1991, 1992  Linus Torvalds
149f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
159f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
169f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#ifndef _LINUX_EXT2_FS_H
179f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define _LINUX_EXT2_FS_H
189f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
19797f5ef14e92294b329e52971d467d7af5b2993eTheodore Ts'o#include <ext2fs/ext2_types.h>		/* Changed from linux/types.h */
209f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
219f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
229f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * The second extended filesystem constants/structures
239f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
249f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
259f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
269f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Define EXT2FS_DEBUG to produce debug messages
279f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
289f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#undef EXT2FS_DEBUG
299f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
309f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
329f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
339f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_PREALLOCATE
349f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_DEFAULT_PREALLOC_BLOCKS	8
359f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
369f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
379f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * The second extended file system version
389f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
399f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2FS_DATE		"95/08/09"
409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2FS_VERSION		"0.5b"
419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
429f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
430fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger * Special inode numbers
449f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
450fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_BAD_INO		 1	/* Bad blocks inode */
469f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ROOT_INO		 2	/* Root inode */
47e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT4_USR_QUOTA_INO	 3	/* User quota inode */
48e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT4_GRP_QUOTA_INO	 4	/* Group quota inode */
499f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_BOOT_LOADER_INO	 5	/* Boot loader inode */
509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_UNDEL_DIR_INO	 6	/* Undelete directory inode */
519f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_RESIZE_INO		 7	/* Reserved group descriptors inode */
529f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_JOURNAL_INO	 8	/* Journal inode */
536d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o#define EXT2_EXCLUDE_INO	 9	/* The "exclude" inode, for snapshots */
54e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT4_REPLICA_INO	10	/* Used by non-upstream feature */
559f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
569f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* First non-reserved inode for old ext2 filesystems */
579f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_GOOD_OLD_FIRST_INO	11
589f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
599f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
609f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * The second extended file system magic number
619f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
629f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_SUPER_MAGIC	0xEF53
639f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
640fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#ifdef __KERNEL__
650fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_SB(sb)	(&((sb)->u.ext2_sb))
660fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#else
670fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger/* Assume that user mode programs are passing in an ext2fs superblock, not
680fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger * a kernel struct super_block.  This will allow us to call the feature-test
690fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger * macros from user land. */
700fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_SB(sb)	(sb)
710fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#endif
720fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger
739f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
749f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Maximal count of links to a file
759f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
76bec6f49a46ec78a4c5928a22214848a7ea654704Theodore Ts'o#define EXT2_LINK_MAX		65000
779f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
789f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
799f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Macro-instructions used to manage several block sizes
809f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
81932a489cdf6bc83d69e59d3f8e0a57b733799ce1Andreas Dilger#define EXT2_MIN_BLOCK_LOG_SIZE		10	/* 1024 */
8239dc1c45cb41ce37a56d364103bb852d0b62c835Theodore Ts'o#define EXT2_MAX_BLOCK_LOG_SIZE		16	/* 65536 */
837da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_MIN_BLOCK_SIZE	(1 << EXT2_MIN_BLOCK_LOG_SIZE)
847da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_MAX_BLOCK_SIZE	(1 << EXT2_MAX_BLOCK_LOG_SIZE)
859f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#ifdef __KERNEL__
867da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_BLOCK_SIZE(s)	((s)->s_blocksize)
877da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_BLOCK_SIZE_BITS(s)	((s)->s_blocksize_bits)
880fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_ADDR_PER_BLOCK_BITS(s)	(EXT2_SB(s)->addr_per_block_bits)
897da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_INODE_SIZE(s)	(EXT2_SB(s)->s_inode_size)
907da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_FIRST_INO(s)	(EXT2_SB(s)->s_first_ino)
919f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#else
927da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_BLOCK_SIZE(s)	(EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
937da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_BLOCK_SIZE_BITS(s)	((s)->s_log_block_size + 10)
949f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_INODE_SIZE(s)	(((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
957da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger				 EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size)
969f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FIRST_INO(s)	(((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
977da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger				 EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino)
989f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#endif
997da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_ADDR_PER_BLOCK(s)	(EXT2_BLOCK_SIZE(s) / sizeof(__u32))
1009f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
1019f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
102e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall * Macro-instructions used to manage allocation clusters
103e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall */
104e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT2_MIN_CLUSTER_LOG_SIZE	EXT2_MIN_BLOCK_LOG_SIZE
105e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT2_MAX_CLUSTER_LOG_SIZE	29	/* 512MB  */
106e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT2_MIN_CLUSTER_SIZE		EXT2_MIN_BLOCK_SIZE
107e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT2_MAX_CLUSTER_SIZE		(1 << EXT2_MAX_CLUSTER_LOG_SIZE)
108e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT2_CLUSTER_SIZE(s)		(EXT2_MIN_BLOCK_SIZE << \
109e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall						(s)->s_log_cluster_size)
110e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT2_CLUSTER_SIZE_BITS(s)	((s)->s_log_cluster_size + 10)
111e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall
112e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall/*
1133fbfad558e01ffbacc14e5a536c4dfec0a0af4f5Theodore Ts'o * Macro-instructions used to manage fragments
114e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall *
115e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall * Note: for backwards compatibility only, for the dump program.
116e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall * Ext2/3/4 will never support fragments....
1173fbfad558e01ffbacc14e5a536c4dfec0a0af4f5Theodore Ts'o */
118e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT2_MIN_FRAG_SIZE              EXT2_MIN_BLOCK_SIZE
119e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT2_MAX_FRAG_SIZE              EXT2_MAX_BLOCK_SIZE
120e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT2_MIN_FRAG_LOG_SIZE          EXT2_MIN_BLOCK_LOG_SIZE
121e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT2_FRAG_SIZE(s)		EXT2_BLOCK_SIZE(s)
122e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT2_FRAGS_PER_BLOCK(s)		1
1233fbfad558e01ffbacc14e5a536c4dfec0a0af4f5Theodore Ts'o
1243fbfad558e01ffbacc14e5a536c4dfec0a0af4f5Theodore Ts'o/*
1259f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * ACL structures
1269f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
1279f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_acl_header	/* Header of Access Control Lists */
1289f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o{
1299f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	aclh_size;
1309f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	aclh_file_count;
1319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	aclh_acle_count;
1329f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	aclh_first_acle;
1339f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o};
1349f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
1359f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_acl_entry	/* Access Control List Entry */
1369f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o{
1379f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	acle_size;
1389f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u16	acle_perms;	/* Access permissions */
1399f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u16	acle_type;	/* Type of entry */
1409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u16	acle_tag;	/* User or group identity */
1419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u16	acle_pad1;
1429f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	acle_next;	/* Pointer on next entry for the */
1439f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o					/* same inode or on next free entry */
1449f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o};
1459f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
1469f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
1479f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Structure of a blocks group descriptor
1489f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
1499f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_group_desc
1509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o{
1518061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o	__u32	bg_block_bitmap;	/* Blocks bitmap block */
1528061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o	__u32	bg_inode_bitmap;	/* Inodes bitmap block */
1539f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	bg_inode_table;		/* Inodes table block */
1549f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u16	bg_free_blocks_count;	/* Free blocks count */
1559f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u16	bg_free_inodes_count;	/* Free inodes count */
1569f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u16	bg_used_dirs_count;	/* Directories count */
157f5fa20078bfc05b554294fe9c5505375d7913e8cTheodore Ts'o	__u16	bg_flags;
158e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u32	bg_exclude_bitmap_lo;	/* Exclude bitmap for snapshots */
159e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u16	bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
160e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u16	bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
1618815fb8a00f5a441eb62f035353db9e0cca90b38Theodore Ts'o	__u16	bg_itable_unused;	/* Unused inodes count */
162e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u16	bg_checksum;		/* crc16(s_uuid+group_num+group_desc)*/
1639f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o};
1649f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
165e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall/*
166e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall * Structure of a blocks group descriptor
167e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall */
1688061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'ostruct ext4_group_desc
1698061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o{
1708061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o	__u32	bg_block_bitmap;	/* Blocks bitmap block */
1718061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o	__u32	bg_inode_bitmap;	/* Inodes bitmap block */
1728061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o	__u32	bg_inode_table;		/* Inodes table block */
1738061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o	__u16	bg_free_blocks_count;	/* Free blocks count */
1748061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o	__u16	bg_free_inodes_count;	/* Free inodes count */
1758061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o	__u16	bg_used_dirs_count;	/* Directories count */
176e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u16	bg_flags;		/* EXT4_BG_flags (INODE_UNINIT, etc) */
177e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u32	bg_exclude_bitmap_lo;	/* Exclude bitmap for snapshots */
178e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u16	bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
179e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u16	bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
1808061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o	__u16	bg_itable_unused;	/* Unused inodes count */
181e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u16	bg_checksum;		/* crc16(sb_uuid+group+desc) */
1828061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o	__u32	bg_block_bitmap_hi;	/* Blocks bitmap block MSB */
1838061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o	__u32	bg_inode_bitmap_hi;	/* Inodes bitmap block MSB */
1848061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o	__u32	bg_inode_table_hi;	/* Inodes table block MSB */
1858061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o	__u16	bg_free_blocks_count_hi;/* Free blocks count MSB */
1868061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o	__u16	bg_free_inodes_count_hi;/* Free inodes count MSB */
1878061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o	__u16	bg_used_dirs_count_hi;	/* Directories count MSB */
188e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u16	bg_itable_unused_hi;	/* Unused inodes count MSB */
189e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u32	bg_exclude_bitmap_hi;	/* Exclude bitmap block MSB */
190e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u16	bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */
191e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u16	bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */
192e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u32	bg_reserved;
1938061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o};
1948061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o
195f5fa20078bfc05b554294fe9c5505375d7913e8cTheodore Ts'o#define EXT2_BG_INODE_UNINIT	0x0001 /* Inode table/bitmap not initialized */
196f5fa20078bfc05b554294fe9c5505375d7913e8cTheodore Ts'o#define EXT2_BG_BLOCK_UNINIT	0x0002 /* Block bitmap not initialized */
197ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos#define EXT2_BG_INODE_ZEROED	0x0004 /* On-disk itable initialized to zero */
198f5fa20078bfc05b554294fe9c5505375d7913e8cTheodore Ts'o
1999f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
200df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * Data structures used by the directory indexing feature
201df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o *
202df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * Note: all of the multibyte integer fields are little endian.
203df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o */
204df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o
205df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o/*
206df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * Note: dx_root_info is laid out so that if it should somehow get
207df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * overlaid by a dirent the two low bits of the hash version will be
208df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * zero.  Therefore, the hash version mod 4 should never be 0.
209df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * Sincerely, the paranoia department.
210df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o */
211df614db6ef79c767745b8154c26d69398b571605Theodore Ts'ostruct ext2_dx_root_info {
212df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o	__u32 reserved_zero;
213df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o	__u8 hash_version; /* 0 now, 1 at release */
214df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o	__u8 info_length; /* 8 */
215df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o	__u8 indirect_levels;
216df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o	__u8 unused_flags;
217df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o};
218df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o
219f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_HASH_LEGACY		0
220f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_HASH_HALF_MD4		1
221f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_HASH_TEA			2
222f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_HASH_LEGACY_UNSIGNED	3 /* reserved for userspace lib */
223f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_HASH_HALF_MD4_UNSIGNED	4 /* reserved for userspace lib */
224f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_HASH_TEA_UNSIGNED		5 /* reserved for userspace lib */
225503f9e7f6eb331c5b75d7f1ad126f71bcdcfb4e3Theodore Ts'o
226503f9e7f6eb331c5b75d7f1ad126f71bcdcfb4e3Theodore Ts'o#define EXT2_HASH_FLAG_INCOMPAT	0x1
227503f9e7f6eb331c5b75d7f1ad126f71bcdcfb4e3Theodore Ts'o
228df614db6ef79c767745b8154c26d69398b571605Theodore Ts'ostruct ext2_dx_entry {
229df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o	__u32 hash;
230df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o	__u32 block;
231df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o};
232df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o
233df614db6ef79c767745b8154c26d69398b571605Theodore Ts'ostruct ext2_dx_countlimit {
234df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o	__u16 limit;
235df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o	__u16 count;
236df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o};
237df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o
238df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o
239df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o/*
2409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Macro-instructions used to manage group descriptors
2419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
242f2de1d38d0819b17895977fabc52d81d0ea6ec00Valerie Clement#define EXT2_MIN_DESC_SIZE             32
243f2de1d38d0819b17895977fabc52d81d0ea6ec00Valerie Clement#define EXT2_MIN_DESC_SIZE_64BIT       64
244f2de1d38d0819b17895977fabc52d81d0ea6ec00Valerie Clement#define EXT2_MAX_DESC_SIZE             EXT2_MIN_BLOCK_SIZE
245f2de1d38d0819b17895977fabc52d81d0ea6ec00Valerie Clement#define EXT2_DESC_SIZE(s)                                                \
246f2de1d38d0819b17895977fabc52d81d0ea6ec00Valerie Clement       ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \
247f2de1d38d0819b17895977fabc52d81d0ea6ec00Valerie Clement	(s)->s_desc_size : EXT2_MIN_DESC_SIZE)
248f2de1d38d0819b17895977fabc52d81d0ea6ec00Valerie Clement
249b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_BLOCKS_PER_GROUP(s)	(EXT2_SB(s)->s_blocks_per_group)
250b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_INODES_PER_GROUP(s)	(EXT2_SB(s)->s_inodes_per_group)
251e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT2_CLUSTERS_PER_GROUP(s)	(EXT2_SB(s)->s_clusters_per_group)
252b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_INODES_PER_BLOCK(s)	(EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s))
253b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */
254e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT2_MAX_BLOCKS_PER_GROUP(s)	((((unsigned) 1 << 16) - 8) *	\
255e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall					 (EXT2_CLUSTER_SIZE(s) / \
256e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall					  EXT2_BLOCK_SIZE(s)))
257e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT2_MAX_CLUSTERS_PER_GROUP(s)	(((unsigned) 1 << 16) - 8)
258e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT2_MAX_INODES_PER_GROUP(s)	(((unsigned) 1 << 16) - \
259e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall					 EXT2_INODES_PER_BLOCK(s))
2609f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#ifdef __KERNEL__
261b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_DESC_PER_BLOCK(s)		(EXT2_SB(s)->s_desc_per_block)
262b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_DESC_PER_BLOCK_BITS(s)	(EXT2_SB(s)->s_desc_per_block_bits)
2639f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#else
264f2de1d38d0819b17895977fabc52d81d0ea6ec00Valerie Clement#define EXT2_DESC_PER_BLOCK(s)		(EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s))
2659f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#endif
2669f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
2679f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
2689f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Constants relative to the data blocks
2699f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
2700fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_NDIR_BLOCKS		12
2710fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IND_BLOCK			EXT2_NDIR_BLOCKS
2720fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DIND_BLOCK			(EXT2_IND_BLOCK + 1)
2730fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_TIND_BLOCK			(EXT2_DIND_BLOCK + 1)
2740fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_N_BLOCKS			(EXT2_TIND_BLOCK + 1)
2759f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
2769f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
2779f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Inode flags
2789f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
2790fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_SECRM_FL			0x00000001 /* Secure deletion */
2800fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_UNRM_FL			0x00000002 /* Undelete */
2810fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_COMPR_FL			0x00000004 /* Compress file */
2829f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_SYNC_FL			0x00000008 /* Synchronous updates */
2839f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_IMMUTABLE_FL		0x00000010 /* Immutable file */
2849f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_APPEND_FL			0x00000020 /* writes to file may only append */
2859f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_NODUMP_FL			0x00000040 /* do not dump file */
2869f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_NOATIME_FL			0x00000080 /* do not update atime */
2879f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* Reserved for compression usage... */
2889f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_DIRTY_FL			0x00000100
2899f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_COMPRBLK_FL		0x00000200 /* One or more compressed clusters */
2900fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_NOCOMPR_FL			0x00000400 /* Access raw compressed data */
2919f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ECOMPR_FL			0x00000800 /* Compression error */
2920fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger/* End compression flags --- maybe not all used */
2939f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_BTREE_FL			0x00001000 /* btree format dir */
294b10820cdcd5f007894b81cf716cf1fdd8523bbcaTheodore Ts'o#define EXT2_INDEX_FL			0x00001000 /* hash-indexed directory */
2959f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_IMAGIC_FL			0x00002000
2969f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT3_JOURNAL_DATA_FL		0x00004000 /* file data should be journaled */
297b3f5b4c22939daba86465d05842bce76053bc3cfTheodore Ts'o#define EXT2_NOTAIL_FL			0x00008000 /* file tail should not be merged */
29888372d5c4b2ebd0405446b42de65bf2b0ebb2408Theodore Ts'o#define EXT2_DIRSYNC_FL 		0x00010000 /* Synchronous directory modifications */
29915f9011add4013d32ea2f7ca7dbf860f95b8ec53Theodore Ts'o#define EXT2_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/
3001ca1059fd0126fd2c065f272a566c18f14bab16dTheodore Ts'o#define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
3018fe81a3d53fbaa1670ece5fb7fd11dd5ae45b8daAndreas Dilger#define EXT4_EXTENTS_FL 		0x00080000 /* Inode uses extents */
302cff9690f4e114d95c9031a7468c99fda0ddcb3ecAndreas Dilger#define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */
303e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall/* EXT4_EOFBLOCKS_FL 0x00400000 was here */
304e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define FS_NOCOW_FL			0x00800000 /* Do not cow file */
3056d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o#define EXT4_SNAPFILE_FL		0x01000000  /* Inode is a snapshot */
3066d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o#define EXT4_SNAPFILE_DELETED_FL	0x04000000  /* Snapshot is being deleted */
3076d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o#define EXT4_SNAPFILE_SHRUNK_FL		0x08000000  /* Snapshot shrink has completed */
3089f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_RESERVED_FL		0x80000000 /* reserved for ext2 lib */
3099f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
3104ffafee26cf791c0c651c08d3dcefcdd363bf127Eric Sandeen#define EXT2_FL_USER_VISIBLE		0x004BDFFF /* User visible flags */
3114ffafee26cf791c0c651c08d3dcefcdd363bf127Eric Sandeen#define EXT2_FL_USER_MODIFIABLE		0x004B80FF /* User modifiable flags */
3129f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
3139f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
3149f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * ioctl commands
3159f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
316bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o
317bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o/* Used for online resize */
318bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'ostruct ext2_new_group_input {
319bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o	__u32 group;		/* Group number for this data */
320bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o	__u32 block_bitmap;	/* Absolute block number of block bitmap */
321bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o	__u32 inode_bitmap;	/* Absolute block number of inode bitmap */
322bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o	__u32 inode_table;	/* Absolute block number of inode table start */
323bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o	__u32 blocks_count;	/* Total number of blocks in this group */
324bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o	__u16 reserved_blocks;	/* Number of reserved blocks in this group */
325bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o	__u16 unused;		/* Number of reserved GDT blocks in group */
326bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o};
327bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o
3285c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'ostruct ext4_new_group_input {
3295c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o	__u32 group;		/* Group number for this data */
3305c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o	__u64 block_bitmap;	/* Absolute block number of block bitmap */
3315c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o	__u64 inode_bitmap;	/* Absolute block number of inode bitmap */
3325c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o	__u64 inode_table;	/* Absolute block number of inode table start */
3335c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o	__u32 blocks_count;	/* Total number of blocks in this group */
3345c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o	__u16 reserved_blocks;	/* Number of reserved blocks in this group */
3355c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o	__u16 unused;
3365c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o};
3375c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o
3383166c58dc0e2be55c9414e019607902c85485e83Theodore Ts'o#ifdef __GNU__			/* Needed for the Hurd */
3393166c58dc0e2be55c9414e019607902c85485e83Theodore Ts'o#define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0)
3403166c58dc0e2be55c9414e019607902c85485e83Theodore Ts'o#endif
3413166c58dc0e2be55c9414e019607902c85485e83Theodore Ts'o
3420fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IOC_GETFLAGS		_IOR('f', 1, long)
3430fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IOC_SETFLAGS		_IOW('f', 2, long)
3440fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IOC_GETVERSION		_IOR('v', 1, long)
3450fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IOC_SETVERSION		_IOW('v', 2, long)
346bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o#define EXT2_IOC_GETVERSION_NEW		_IOR('f', 3, long)
347bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o#define EXT2_IOC_SETVERSION_NEW		_IOW('f', 4, long)
348bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o#define EXT2_IOC_GROUP_EXTEND		_IOW('f', 7, unsigned long)
349bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o#define EXT2_IOC_GROUP_ADD		_IOW('f', 8,struct ext2_new_group_input)
3505c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o#define EXT4_IOC_GROUP_ADD		_IOW('f', 8,struct ext4_new_group_input)
351e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define EXT4_IOC_RESIZE_FS		_IOW('f', 16, __u64)
3529f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
3539f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
3549f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Structure of an inode on the disk
3559f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
3569f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_inode {
3579f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u16	i_mode;		/* File mode */
3589f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u16	i_uid;		/* Low 16 bits of Owner Uid */
3599f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	i_size;		/* Size in bytes */
3609f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	i_atime;	/* Access time */
3616b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o	__u32	i_ctime;	/* Inode change time */
3629f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	i_mtime;	/* Modification time */
3639f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	i_dtime;	/* Deletion Time */
3649f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u16	i_gid;		/* Low 16 bits of Group Id */
3659f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u16	i_links_count;	/* Links count */
3669f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	i_blocks;	/* Blocks count */
3679f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	i_flags;	/* File flags */
3689f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	union {
3699f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o		struct {
370d362a3fb7ec1a2b46601f55f4dbae83563c27717Theodore Ts'o			__u32	l_i_version; /* was l_i_reserved1 */
3719f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o		} linux1;
3729f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o		struct {
3739f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o			__u32  h_i_translator;
3749f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o		} hurd1;
3759f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	} osd1;				/* OS dependent 1 */
3769f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
3779f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	i_generation;	/* File version (for NFS) */
3789f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	i_file_acl;	/* File ACL */
379e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u32	i_size_high;	/* Formerly i_dir_acl, directory ACL */
3809f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	i_faddr;	/* Fragment address */
3819f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	union {
3829f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o		struct {
3835d17119d14fe1276936c85d7986695a4543b1aa1Theodore Ts'o			__u16	l_i_blocks_hi;
384bb767b2fc3b4420f566df6f563574fd8e5c856b1Theodore Ts'o			__u16	l_i_file_acl_high;
3859f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o			__u16	l_i_uid_high;	/* these 2 fields    */
3869f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o			__u16	l_i_gid_high;	/* were reserved2[0] */
387e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall			__u16	l_i_checksum_lo; /* crc32c(uuid+inum+inode) */
388e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall			__u16	l_i_reserved;
3899f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o		} linux2;
3909f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o		struct {
3919f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o			__u8	h_i_frag;	/* Fragment number */
3929f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o			__u8	h_i_fsize;	/* Fragment size */
3939f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o			__u16	h_i_mode_high;
3949f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o			__u16	h_i_uid_high;
3959f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o			__u16	h_i_gid_high;
3969f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o			__u32	h_i_author;
3979f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o		} hurd2;
3989f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	} osd2;				/* OS dependent 2 */
3999f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o};
4009f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
4017331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o/*
4027331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o * Permanent part of an large inode on the disk
4037331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o */
4047331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'ostruct ext2_inode_large {
4057331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	__u16	i_mode;		/* File mode */
4067331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	__u16	i_uid;		/* Low 16 bits of Owner Uid */
4077331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	__u32	i_size;		/* Size in bytes */
4087331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	__u32	i_atime;	/* Access time */
4096b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o	__u32	i_ctime;	/* Inode Change time */
4107331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	__u32	i_mtime;	/* Modification time */
4117331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	__u32	i_dtime;	/* Deletion Time */
4127331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	__u16	i_gid;		/* Low 16 bits of Group Id */
4137331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	__u16	i_links_count;	/* Links count */
4147331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	__u32	i_blocks;	/* Blocks count */
4157331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	__u32	i_flags;	/* File flags */
4167331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	union {
4177331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o		struct {
418d362a3fb7ec1a2b46601f55f4dbae83563c27717Theodore Ts'o			__u32	l_i_version; /* was l_i_reserved1 */
4197331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o		} linux1;
4207331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o		struct {
4217331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o			__u32  h_i_translator;
4227331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o		} hurd1;
4237331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	} osd1;				/* OS dependent 1 */
4247331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	__u32	i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
4257331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	__u32	i_generation;	/* File version (for NFS) */
4267331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	__u32	i_file_acl;	/* File ACL */
427e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u32	i_size_high;	/* Formerly i_dir_acl, directory ACL */
4287331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	__u32	i_faddr;	/* Fragment address */
4297331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	union {
4307331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o		struct {
4315d17119d14fe1276936c85d7986695a4543b1aa1Theodore Ts'o			__u16	l_i_blocks_hi;
432bb767b2fc3b4420f566df6f563574fd8e5c856b1Theodore Ts'o			__u16	l_i_file_acl_high;
4337331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o			__u16	l_i_uid_high;	/* these 2 fields    */
4347331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o			__u16	l_i_gid_high;	/* were reserved2[0] */
435e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall			__u16	l_i_checksum_lo; /* crc32c(uuid+inum+inode) */
436e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall			__u16	l_i_reserved;
4377331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o		} linux2;
4387331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o		struct {
4397331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o			__u8	h_i_frag;	/* Fragment number */
4407331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o			__u8	h_i_fsize;	/* Fragment size */
4417331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o			__u16	h_i_mode_high;
4427331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o			__u16	h_i_uid_high;
4437331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o			__u16	h_i_gid_high;
4447331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o			__u32	h_i_author;
4457331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o		} hurd2;
4467331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	} osd2;				/* OS dependent 2 */
4477331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o	__u16	i_extra_isize;
448e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u16	i_checksum_hi;	/* crc32c(uuid+inum+inode) */
4496b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o	__u32	i_ctime_extra;	/* extra Change time (nsec << 2 | epoch) */
4506b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o	__u32	i_mtime_extra;	/* extra Modification time (nsec << 2 | epoch) */
4516b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o	__u32	i_atime_extra;	/* extra Access time (nsec << 2 | epoch) */
4526b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o	__u32	i_crtime;	/* File creation time */
4536b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o	__u32	i_crtime_extra;	/* extra File creation time (nsec << 2 | epoch)*/
454bb767b2fc3b4420f566df6f563574fd8e5c856b1Theodore Ts'o	__u32	i_version_hi;	/* high 32 bits for 64-bit version */
4557331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o};
4567331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o
457e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define i_dir_acl	i_size_high
4589f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
4599f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#if defined(__KERNEL__) || defined(__linux__)
4609f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_reserved1	osd1.linux1.l_i_reserved1
4619f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_frag		osd2.linux2.l_i_frag
4629f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_fsize		osd2.linux2.l_i_fsize
4639f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_uid_low	i_uid
4649f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_gid_low	i_gid
4659f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_uid_high	osd2.linux2.l_i_uid_high
4669f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_gid_high	osd2.linux2.l_i_gid_high
46748e6e81362f264aee4f3945c14928efaf71a06c9Theodore Ts'o#else
46848e6e81362f264aee4f3945c14928efaf71a06c9Theodore Ts'o#if defined(__GNU__)
4699f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
4709f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_translator	osd1.hurd1.h_i_translator
4719f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_frag		osd2.hurd2.h_i_frag;
4729f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_fsize		osd2.hurd2.h_i_fsize;
4739f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_uid_high	osd2.hurd2.h_i_uid_high
4749f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_gid_high	osd2.hurd2.h_i_gid_high
4759f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_author	osd2.hurd2.h_i_author
4769f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
47748e6e81362f264aee4f3945c14928efaf71a06c9Theodore Ts'o#endif  /* __GNU__ */
4787da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#endif	/* defined(__KERNEL__) || defined(__linux__) */
4799f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
4807132d48d83f79992773b6d9f1cace8d96366f08bTheodore Ts'o#define inode_uid(inode)	((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16)
4817132d48d83f79992773b6d9f1cace8d96366f08bTheodore Ts'o#define inode_gid(inode)	((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16)
482153439222e6a16e40be324408d8d19361bc1e65eTheodore Ts'o#define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x))
483153439222e6a16e40be324408d8d19361bc1e65eTheodore Ts'o#define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x))
4843306861158a1ca27b7ec83bb33fb8fbbf043d24cTheodore Ts'o
4859f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
4869f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * File system states
4879f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
4880fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_VALID_FS			0x0001	/* Unmounted cleanly */
4890fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_ERROR_FS			0x0002	/* Errors detected */
490a80f3694a7b99756e747683f01ab8a5bca022251Theodore Ts'o#define EXT3_ORPHAN_FS			0x0004	/* Orphans being recovered */
4919f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
4929f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
493f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o * Misc. filesystem flags
494f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o */
495f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_FLAGS_SIGNED_HASH		0x0001  /* Signed dirhash in use */
496f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_FLAGS_UNSIGNED_HASH	0x0002  /* Unsigned dirhash in use */
4976cb27404f51f97e2665fa0e0c4c0f7bc47e698ecTheodore Ts'o#define EXT2_FLAGS_TEST_FILESYS		0x0004	/* OK for use on development code */
4986d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o#define EXT2_FLAGS_IS_SNAPSHOT		0x0010	/* This is a snapshot image */
4996d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o#define EXT2_FLAGS_FIX_SNAPSHOT		0x0020	/* Snapshot inodes corrupted */
5006d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o#define EXT2_FLAGS_FIX_EXCLUDE		0x0040	/* Exclude bitmaps corrupted */
501f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o
502f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o/*
5039f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Mount flags
5049f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
5059f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_CHECK		0x0001	/* Do mount-time checks */
5069f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_GRPID		0x0004	/* Create files with directory's group */
5079f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_DEBUG		0x0008	/* Some debugging messages */
5089f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_ERRORS_CONT		0x0010	/* Continue on errors */
5099f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_ERRORS_RO		0x0020	/* Remount fs ro on errors */
5109f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_ERRORS_PANIC		0x0040	/* Panic on errors */
5119f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_MINIX_DF		0x0080	/* Mimics the Minix statfs */
5129f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_NO_UID32		0x0200  /* Disable 32-bit UIDs */
5139f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
5149f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define clear_opt(o, opt)		o &= ~EXT2_MOUNT_##opt
5159f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define set_opt(o, opt)			o |= EXT2_MOUNT_##opt
5160fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define test_opt(sb, opt)		(EXT2_SB(sb)->s_mount_opt & \
5179f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o					 EXT2_MOUNT_##opt)
5189f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
5199f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Maximal mount counts between two filesystem checks
5209f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
5219f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_DFL_MAX_MNT_COUNT		20	/* Allow 20 mounts */
5229f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_DFL_CHECKINTERVAL		0	/* Don't use interval check */
5239f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
5249f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
5259f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Behaviour when detecting errors
5269f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
5279f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ERRORS_CONTINUE		1	/* Continue execution */
5289f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ERRORS_RO			2	/* Remount fs read-only */
5299f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ERRORS_PANIC		3	/* Panic */
5309f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ERRORS_DEFAULT		EXT2_ERRORS_CONTINUE
5319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o
532993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o#if (__GNUC__ >= 4)
533993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o#define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER)
534993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o#else
535993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o#define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
536993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o#endif
537993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o
5389f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/*
5399f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Structure of the super block
5409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */
5419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_super_block {
5429f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	s_inodes_count;		/* Inodes count */
5439f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	s_blocks_count;		/* Blocks count */
5449f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	s_r_blocks_count;	/* Reserved blocks count */
5459f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	s_free_blocks_count;	/* Free blocks count */
5469f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	s_free_inodes_count;	/* Free inodes count */
5479f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	s_first_data_block;	/* First Data Block */
5489f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	s_log_block_size;	/* Block size */
549e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u32	s_log_cluster_size;	/* Allocation cluster size */
5509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	s_blocks_per_group;	/* # Blocks per group */
551e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall	__u32	s_clusters_per_group;	/* # Fragments per group */
5529f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	s_inodes_per_group;	/* # Inodes per group */
5539f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	s_mtime;		/* Mount time */
5549f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u32	s_wtime;		/* Write time */
5559f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o	__u16	s_mnt_count;		/* Mount count */
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