26b59ce6a7
When this feature is enabled, mke2fs doesn't necessarily allocate a super block and its associated descriptor blocks for every group. The (non-)allocations are reflected in the block bitmap. Since the filesystem code doesn't write to these blocks except for the first superblock, all it has to do to support them is to not count them in ext2_statfs() and not attempt to check them at mount time in ext2_check_blocks_bitmap() (the check has never been enabled in FreeBSD anyway).
573 lines
17 KiB
C
573 lines
17 KiB
C
/*
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* modified for EXT2FS support in Lites 1.1
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*
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* Aug 1995, Godmar Back (gback@cs.utah.edu)
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* University of Utah, Department of Computer Science
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*
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* $FreeBSD$
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*/
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/*
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* linux/include/linux/ext2_fs.h
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/include/linux/minix_fs.h
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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#ifndef _LINUX_EXT2_FS_H
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#define _LINUX_EXT2_FS_H
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#include <sys/types.h>
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#define __u32 u_int32_t
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#define u32 u_int32_t
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#define __u16 u_int16_t
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#define __u8 u_int8_t
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#define __s32 int32_t
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#define __s16 int16_t
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#define __s8 int8_t
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#define umode_t mode_t
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#define loff_t off_t
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/* the Linux implementation of EXT2 stores some information about
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* an inode in a ext2_inode_info structure which is part of the incore
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* inode in Linux
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* I decided to use the "spare" fields instead - we'll see how this
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* works out
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*/
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#define i_block_group i_spare[0]
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#define i_next_alloc_block i_spare[1]
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#define i_next_alloc_goal i_spare[2]
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#define i_prealloc_block i_spare[3]
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#define i_prealloc_count i_din.di_spare[0]
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/*
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* The second extended filesystem constants/structures
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*/
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/*
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* Define EXT2FS_DEBUG to produce debug messages
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*/
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#undef EXT2FS_DEBUG
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/*
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* Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
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*/
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#define EXT2_PREALLOCATE
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#define EXT2_DEFAULT_PREALLOC_BLOCKS 8
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/*
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* The second extended file system version
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*/
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#define EXT2FS_DATE "95/08/09"
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#define EXT2FS_VERSION "0.5b"
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/*
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* Debug code
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*/
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#ifdef EXT2FS_DEBUG
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# define ext2_debug(f, a...) { \
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printf ("EXT2-fs DEBUG (%s, %d): %s:", \
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__FILE__, __LINE__, __FUNCTION__); \
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printf (f, ## a); \
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}
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#else
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# define ext2_debug(f, a...) /**/
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#endif
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/*
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* Special inodes numbers
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*/
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#define EXT2_BAD_INO 1 /* Bad blocks inode */
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#define EXT2_ROOT_INO 2 /* Root inode */
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#define EXT2_ACL_IDX_INO 3 /* ACL inode */
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#define EXT2_ACL_DATA_INO 4 /* ACL inode */
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#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
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#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
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/* First non-reserved inode for old ext2 filesystems */
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#define EXT2_GOOD_OLD_FIRST_INO 11
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/*
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* The second extended file system magic number
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*/
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#define EXT2_SUPER_MAGIC 0xEF53
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/*
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* Maximal count of links to a file
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*/
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#define EXT2_LINK_MAX 32000
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/*
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* Note: under FreeBSD, the "user" versions of the following macros are
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* used (and must be used) in most cases, because ((s)->u.ext2_sb.s_es is
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* not accessible. This depends on __KERNEL__ not being defined for
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* kernel builds under FreeBSD.
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*/
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/*
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* Macro-instructions used to manage several block sizes
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*/
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#define EXT2_MIN_BLOCK_SIZE 1024
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#define EXT2_MAX_BLOCK_SIZE 4096
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#define EXT2_MIN_BLOCK_LOG_SIZE 10
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#if defined(__KERNEL__) || (defined(__FreeBSD__) && defined(_KERNEL))
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# define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
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#else
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# define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
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#endif
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#define EXT2_ACLE_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_acl_entry))
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#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
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#ifdef __KERNEL__
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# define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
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#else
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# define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
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#endif
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#ifdef notyet
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#ifdef __KERNEL__
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#define EXT2_ADDR_PER_BLOCK_BITS(s) ((s)->u.ext2_sb.s_addr_per_block_bits)
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#define EXT2_INODE_SIZE(s) ((s)->u.ext2_sb.s_inode_size)
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#define EXT2_FIRST_INO(s) ((s)->u.ext2_sb.s_first_ino)
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#else
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#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
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EXT2_GOOD_OLD_INODE_SIZE : \
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(s)->s_inode_size)
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#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
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EXT2_GOOD_OLD_FIRST_INO : \
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(s)->s_first_ino)
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#endif
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#else /* !notyet */
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#define EXT2_INODES_PER_BLOCK(s) ((s)->s_inodes_per_block)
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/* Should be sizeof(struct ext2_inode): */
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#define EXT2_INODE_SIZE 128
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#define EXT2_FIRST_INO 11
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#endif /* notyet */
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/*
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* Macro-instructions used to manage fragments
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*/
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#define EXT2_MIN_FRAG_SIZE 1024
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#define EXT2_MAX_FRAG_SIZE 4096
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#define EXT2_MIN_FRAG_LOG_SIZE 10
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#ifdef __KERNEL__
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# define EXT2_FRAG_SIZE(s) ((s)->u.ext2_sb.s_frag_size)
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# define EXT2_FRAGS_PER_BLOCK(s) ((s)->u.ext2_sb.s_frags_per_block)
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#else
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# if defined(_KERNEL) && defined(__FreeBSD__)
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# define EXT2_FRAG_SIZE(s) ((s)->s_frag_size)
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# else
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# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
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# endif
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# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
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#endif
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/*
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* ACL structures
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*/
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struct ext2_acl_header /* Header of Access Control Lists */
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{
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__u32 aclh_size;
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__u32 aclh_file_count;
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__u32 aclh_acle_count;
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__u32 aclh_first_acle;
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};
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struct ext2_acl_entry /* Access Control List Entry */
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{
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__u32 acle_size;
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__u16 acle_perms; /* Access permissions */
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__u16 acle_type; /* Type of entry */
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__u16 acle_tag; /* User or group identity */
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__u16 acle_pad1;
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__u32 acle_next; /* Pointer on next entry for the */
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/* same inode or on next free entry */
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};
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/*
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* Structure of a blocks group descriptor
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*/
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struct ext2_group_desc
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{
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__u32 bg_block_bitmap; /* Blocks bitmap block */
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__u32 bg_inode_bitmap; /* Inodes bitmap block */
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__u32 bg_inode_table; /* Inodes table block */
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__u16 bg_free_blocks_count; /* Free blocks count */
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__u16 bg_free_inodes_count; /* Free inodes count */
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__u16 bg_used_dirs_count; /* Directories count */
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__u16 bg_pad;
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__u32 bg_reserved[3];
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};
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/*
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* Macro-instructions used to manage group descriptors
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*/
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#ifdef __KERNEL__
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# define EXT2_BLOCKS_PER_GROUP(s) ((s)->u.ext2_sb.s_blocks_per_group)
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# define EXT2_DESC_PER_BLOCK(s) ((s)->u.ext2_sb.s_desc_per_block)
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# define EXT2_INODES_PER_GROUP(s) ((s)->u.ext2_sb.s_inodes_per_group)
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# define EXT2_DESC_PER_BLOCK_BITS(s) ((s)->u.ext2_sb.s_desc_per_block_bits)
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#else
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# define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
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# define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
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# define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
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#endif
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/*
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* Constants relative to the data blocks
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*/
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#define EXT2_NDIR_BLOCKS 12
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#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
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#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
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#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
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#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
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#define EXT2_MAXSYMLINKLEN (EXT2_N_BLOCKS * sizeof (__u32))
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/*
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* Inode flags
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*/
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#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */
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#define EXT2_UNRM_FL 0x00000002 /* Undelete */
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#define EXT2_COMPR_FL 0x00000004 /* Compress file */
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#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */
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#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */
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#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */
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#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */
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#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */
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/* Reserved for compression usage... */
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#define EXT2_DIRTY_FL 0x00000100
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#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
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#define EXT2_NOCOMP_FL 0x00000400 /* Don't compress */
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#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */
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/* End compression flags --- maybe not all used */
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#define EXT2_BTREE_FL 0x00001000 /* btree format dir */
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#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
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#define EXT2_FL_USER_VISIBLE 0x00001FFF /* User visible flags */
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#define EXT2_FL_USER_MODIFIABLE 0x000000FF /* User modifiable flags */
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/*
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* ioctl commands
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*/
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#define EXT2_IOC_GETFLAGS _IOR('f', 1, long)
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#define EXT2_IOC_SETFLAGS _IOW('f', 2, long)
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#define EXT2_IOC_GETVERSION _IOR('v', 1, long)
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#define EXT2_IOC_SETVERSION _IOW('v', 2, long)
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/*
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* Only declare `struct ext2_inode' if <ufs/ufs/inode.h> hasn't made things
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* difficult by #defining i_mode and other struct members. The details of
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* the struct are only needed in ext2_inode_cnv.c where the ext2fs on-disk
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* inode is converted to a ufs in-core inode.
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*/
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#ifndef i_mode
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/*
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* Structure of an inode on the disk
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*/
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struct ext2_inode {
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__u16 i_mode; /* File mode */
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__u16 i_uid; /* Owner Uid */
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__u32 i_size; /* Size in bytes */
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__u32 i_atime; /* Access time */
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__u32 i_ctime; /* Creation time */
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__u32 i_mtime; /* Modification time */
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__u32 i_dtime; /* Deletion Time */
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__u16 i_gid; /* Group Id */
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__u16 i_links_count; /* Links count */
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__u32 i_blocks; /* Blocks count */
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__u32 i_flags; /* File flags */
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union {
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struct {
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__u32 l_i_reserved1;
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} linux1;
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struct {
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__u32 h_i_translator;
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} hurd1;
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struct {
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__u32 m_i_reserved1;
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} masix1;
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} osd1; /* OS dependent 1 */
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__u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
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__u32 i_generation; /* File version (for NFS) */
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__u32 i_file_acl; /* File ACL */
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__u32 i_dir_acl; /* Directory ACL */
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__u32 i_faddr; /* Fragment address */
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union {
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struct {
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__u8 l_i_frag; /* Fragment number */
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__u8 l_i_fsize; /* Fragment size */
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__u16 i_pad1;
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__u32 l_i_reserved2[2];
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} linux2;
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struct {
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__u8 h_i_frag; /* Fragment number */
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__u8 h_i_fsize; /* Fragment size */
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__u16 h_i_mode_high;
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__u16 h_i_uid_high;
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__u16 h_i_gid_high;
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__u32 h_i_author;
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} hurd2;
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struct {
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__u8 m_i_frag; /* Fragment number */
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__u8 m_i_fsize; /* Fragment size */
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__u16 m_pad1;
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__u32 m_i_reserved2[2];
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} masix2;
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} osd2; /* OS dependent 2 */
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};
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#define i_size_high i_dir_acl
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#if defined(__KERNEL__) || defined(__linux__)
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#define i_reserved1 osd1.linux1.l_i_reserved1
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#define i_frag osd2.linux2.l_i_frag
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#define i_fsize osd2.linux2.l_i_fsize
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#define i_reserved2 osd2.linux2.l_i_reserved2
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#endif
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#ifdef __hurd__
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#define i_translator osd1.hurd1.h_i_translator
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#define i_frag osd2.hurd2.h_i_frag;
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#define i_fsize osd2.hurd2.h_i_fsize;
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#define i_uid_high osd2.hurd2.h_i_uid_high
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#define i_gid_high osd2.hurd2.h_i_gid_high
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#define i_author osd2.hurd2.h_i_author
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#endif
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#ifdef __masix__
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#define i_reserved1 osd1.masix1.m_i_reserved1
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#define i_frag osd2.masix2.m_i_frag
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#define i_fsize osd2.masix2.m_i_fsize
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#define i_reserved2 osd2.masix2.m_i_reserved2
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#endif
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#endif /* i_mode */
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/*
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* File system states
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*/
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#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
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#define EXT2_ERROR_FS 0x0002 /* Errors detected */
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/*
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* Mount flags
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*/
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#define EXT2_MOUNT_CHECK_NORMAL 0x0001 /* Do some more checks */
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#define EXT2_MOUNT_CHECK_STRICT 0x0002 /* Do again more checks */
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#define EXT2_MOUNT_CHECK (EXT2_MOUNT_CHECK_NORMAL | \
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EXT2_MOUNT_CHECK_STRICT)
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#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */
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#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */
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#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
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#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
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#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
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#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */
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#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
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#define set_opt(o, opt) o |= EXT2_MOUNT_##opt
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#define test_opt(sb, opt) ((sb)->u.ext2_sb.s_mount_opt & \
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EXT2_MOUNT_##opt)
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/*
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* Maximal mount counts between two filesystem checks
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*/
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#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
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#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
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/*
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* Behaviour when detecting errors
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*/
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#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
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#define EXT2_ERRORS_RO 2 /* Remount fs read-only */
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#define EXT2_ERRORS_PANIC 3 /* Panic */
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#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
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/*
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* Structure of the super block
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*/
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struct ext2_super_block {
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__u32 s_inodes_count; /* Inodes count */
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__u32 s_blocks_count; /* Blocks count */
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__u32 s_r_blocks_count; /* Reserved blocks count */
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__u32 s_free_blocks_count; /* Free blocks count */
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__u32 s_free_inodes_count; /* Free inodes count */
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__u32 s_first_data_block; /* First Data Block */
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__u32 s_log_block_size; /* Block size */
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__s32 s_log_frag_size; /* Fragment size */
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__u32 s_blocks_per_group; /* # Blocks per group */
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__u32 s_frags_per_group; /* # Fragments per group */
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__u32 s_inodes_per_group; /* # Inodes per group */
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__u32 s_mtime; /* Mount time */
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__u32 s_wtime; /* Write time */
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__u16 s_mnt_count; /* Mount count */
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__s16 s_max_mnt_count; /* Maximal mount count */
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__u16 s_magic; /* Magic signature */
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__u16 s_state; /* File system state */
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__u16 s_errors; /* Behaviour when detecting errors */
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__u16 s_minor_rev_level; /* minor revision level */
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__u32 s_lastcheck; /* time of last check */
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__u32 s_checkinterval; /* max. time between checks */
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__u32 s_creator_os; /* OS */
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__u32 s_rev_level; /* Revision level */
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__u16 s_def_resuid; /* Default uid for reserved blocks */
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__u16 s_def_resgid; /* Default gid for reserved blocks */
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/*
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* These fields are for EXT2_DYNAMIC_REV superblocks only.
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*
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* Note: the difference between the compatible feature set and
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* the incompatible feature set is that if there is a bit set
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* in the incompatible feature set that the kernel doesn't
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* know about, it should refuse to mount the filesystem.
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*
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* e2fsck's requirements are more strict; if it doesn't know
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* about a feature in either the compatible or incompatible
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* feature set, it must abort and not try to meddle with
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* things it doesn't understand...
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*/
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__u32 s_first_ino; /* First non-reserved inode */
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__u16 s_inode_size; /* size of inode structure */
|
|
__u16 s_block_group_nr; /* block group # of this superblock */
|
|
__u32 s_feature_compat; /* compatible feature set */
|
|
__u32 s_feature_incompat; /* incompatible feature set */
|
|
__u32 s_feature_ro_compat; /* readonly-compatible feature set */
|
|
__u8 s_uuid[16]; /* 128-bit uuid for volume */
|
|
char s_volume_name[16]; /* volume name */
|
|
char s_last_mounted[64]; /* directory where last mounted */
|
|
__u32 s_algorithm_usage_bitmap; /* For compression */
|
|
/*
|
|
* Performance hints. Directory preallocation should only
|
|
* happen if the EXT2_COMPAT_PREALLOC flag is on.
|
|
*/
|
|
__u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
|
|
__u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
|
|
__u16 s_padding1;
|
|
__u32 s_reserved[204]; /* Padding to the end of the block */
|
|
};
|
|
|
|
#ifdef __KERNEL__
|
|
#define EXT2_SB(sb) (&((sb)->u.ext2_sb))
|
|
#else
|
|
/* Assume that user mode programs are passing in an ext2fs superblock, not
|
|
* a kernel struct super_block. This will allow us to call the feature-test
|
|
* macros from user land. */
|
|
#define EXT2_SB(sb) (sb)
|
|
#endif
|
|
|
|
/*
|
|
* Codes for operating systems
|
|
*/
|
|
#define EXT2_OS_LINUX 0
|
|
#define EXT2_OS_HURD 1
|
|
#define EXT2_OS_MASIX 2
|
|
#define EXT2_OS_FREEBSD 3
|
|
#define EXT2_OS_LITES 4
|
|
|
|
/*
|
|
* Revision levels
|
|
*/
|
|
#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
|
|
#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
|
|
|
|
#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
|
|
#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
|
|
|
|
#define EXT2_GOOD_OLD_INODE_SIZE 128
|
|
|
|
/*
|
|
* Feature set definitions
|
|
*/
|
|
|
|
#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
|
|
( EXT2_SB(sb)->s_feature_compat & (mask) )
|
|
#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
|
|
( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
|
|
#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
|
|
( EXT2_SB(sb)->s_feature_incompat & (mask) )
|
|
|
|
#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
|
|
|
|
#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
|
|
#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
|
|
#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
|
|
|
|
#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
|
|
#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
|
|
|
|
#define EXT2_FEATURE_COMPAT_SUPP 0
|
|
#define EXT2_FEATURE_INCOMPAT_SUPP EXT2_FEATURE_INCOMPAT_FILETYPE
|
|
#ifdef notyet
|
|
#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
|
|
EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
|
|
EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
|
|
#else
|
|
#define EXT2_FEATURE_RO_COMPAT_SUPP EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER
|
|
#endif
|
|
|
|
/*
|
|
* Default values for user and/or group using reserved blocks
|
|
*/
|
|
#define EXT2_DEF_RESUID 0
|
|
#define EXT2_DEF_RESGID 0
|
|
|
|
/*
|
|
* Structure of a directory entry
|
|
*/
|
|
#define EXT2_NAME_LEN 255
|
|
|
|
struct ext2_dir_entry {
|
|
__u32 inode; /* Inode number */
|
|
__u16 rec_len; /* Directory entry length */
|
|
__u16 name_len; /* Name length */
|
|
char name[EXT2_NAME_LEN]; /* File name */
|
|
};
|
|
|
|
/*
|
|
* The new version of the directory entry. Since EXT2 structures are
|
|
* stored in intel byte order, and the name_len field could never be
|
|
* bigger than 255 chars, it's safe to reclaim the extra byte for the
|
|
* file_type field.
|
|
*/
|
|
struct ext2_dir_entry_2 {
|
|
__u32 inode; /* Inode number */
|
|
__u16 rec_len; /* Directory entry length */
|
|
__u8 name_len; /* Name length */
|
|
__u8 file_type;
|
|
char name[EXT2_NAME_LEN]; /* File name */
|
|
};
|
|
|
|
/*
|
|
* Ext2 directory file types. Only the low 3 bits are used. The
|
|
* other bits are reserved for now.
|
|
*/
|
|
#define EXT2_FT_UNKNOWN 0
|
|
#define EXT2_FT_REG_FILE 1
|
|
#define EXT2_FT_DIR 2
|
|
#define EXT2_FT_CHRDEV 3
|
|
#define EXT2_FT_BLKDEV 4
|
|
#define EXT2_FT_FIFO 5
|
|
#define EXT2_FT_SOCK 6
|
|
#define EXT2_FT_SYMLINK 7
|
|
|
|
#define EXT2_FT_MAX 8
|
|
|
|
/*
|
|
* EXT2_DIR_PAD defines the directory entries boundaries
|
|
*
|
|
* NOTE: It must be a multiple of 4
|
|
*/
|
|
#define EXT2_DIR_PAD 4
|
|
#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
|
|
#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
|
|
~EXT2_DIR_ROUND)
|
|
|
|
#endif /* _LINUX_EXT2_FS_H */
|