/*
* linux/include/linux/ext3_fs.h
*
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card (card@masi.ibp.fr)
* Laboratoire MASI - Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
*
* from
*
* linux/include/linux/minix_fs.h
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
#ifndef _LINUX_EXT3_FS_H
#define _LINUX_EXT3_FS_H
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/magic.h>
/*
* The second extended filesystem constants/structures
*/
/*
* Define EXT3FS_DEBUG to produce debug messages
*/
#undef EXT3FS_DEBUG
/*
* Define EXT3_RESERVATION to reserve data blocks for expanding files
*/
#define EXT3_DEFAULT_RESERVE_BLOCKS 8
/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
#define EXT3_MAX_RESERVE_BLOCKS 1027
#define EXT3_RESERVE_WINDOW_NOT_ALLOCATED 0
/*
* Debug code
*/
#ifdef EXT3FS_DEBUG
#define ext3_debug(f, a...) \
do { \
printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:", \
__FILE__, __LINE__, __FUNCTION__); \
printk (KERN_DEBUG f, ## a); \
} while (0)
#else
#define ext3_debug
#endif
/*
* Special inodes numbers
*/
#define EXT3_BAD_INO 1 /* Bad blocks inode */
#define EXT3_ROOT_INO 2 /* Root inode */
#define EXT3_BOOT_LOADER_INO 5 /* Boot loader inode */
#define EXT3_UNDEL_DIR_INO 6 /* Undelete directory inode */
#define EXT3_RESIZE_INO 7 /* Reserved group descriptors inode */
#define EXT3_JOURNAL_INO 8 /* Journal inode */
/* First non-reserved inode for old ext3 filesystems */
#define EXT3_GOOD_OLD_FIRST_INO 11
/*
* Maximal count of links to a file
*/
#define EXT3_LINK_MAX 32000
/*
* Macro-instructions used to manage several block sizes
*/
#define EXT3_MIN_BLOCK_SIZE 1024
#define EXT3_MAX_BLOCK_SIZE 65536
#define EXT3_MIN_BLOCK_LOG_SIZE 10
#ifdef __KERNEL__
# define EXT3_BLOCK_SIZE(s) ((s)->s_blocksize)
#else
# define EXT3_BLOCK_SIZE(s) (EXT3_MIN_BLOCK_SIZE << (s)->s_log_block_size)
#endif
#define EXT3_ADDR_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
#ifdef __KERNEL__
# define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
#else
# define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
#endif
#ifdef __KERNEL__
#define EXT3_ADDR_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_addr_per_block_bits)
#define EXT3_INODE_SIZE(s) (EXT3_SB(s)->s_inode_size)
#define EXT3_FIRST_INO(s) (EXT3_SB(s)->s_first_ino)
#else
#define EXT3_INODE_SIZE(s) (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
EXT3_GOOD_OLD_INODE_SIZE : \
(s)->s_inode_size)
#define EXT3_FIRST_INO(s) (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
EXT3_GOOD_OLD_FIRST_INO : \
(s)->s_first_ino)
#endif
/*
* Macro-instructions used to manage fragments
*/
#define EXT3_MIN_FRAG_SIZE 1024
#define EXT3_MAX_FRAG_SIZE 4096
#define EXT3_MIN_FRAG_LOG_SIZE 10
#ifdef __KERNEL__
# define EXT3_FRAG_SIZE(s) (EXT3_SB(s)->s_frag_size)
# define EXT3_FRAGS_PER_BLOCK(s) (EXT3_SB(s)->s_frags_per_block)
#else
# define EXT3_FRAG_SIZE(s) (EXT3_MIN_FRAG_SIZE << (s)->s_log_frag_size)
# define EXT3_FRAGS_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / EXT3_FRAG_SIZE(s))
#endif
/*
* Structure of a blocks group descriptor
*/
struct ext3_group_desc
{
__le32 bg_block_bitmap; /* Blocks bitmap block */
__le32 bg_inode_bitmap; /* Inodes bitmap block */
__le32 bg_inode_table; /* Inodes table block */
__le16 bg_free_blocks_count; /* Free blocks count */
__le16 bg_free_inodes_count; /* Free inodes count */
__le16 bg_used_dirs_count; /* Directories count */
__u16 bg_pad;
__le32 bg_reserved[3];
};
/*
* Structure of a blocks group descriptor
*/
struct ext4_group_desc
{
__le32 bg_block_bitmap; /* Blocks bitmap block */
__le32 bg_inode_bitmap; /* Inodes bitmap block */
__le32 bg_inode_table; /* Inodes table block */
__le16 bg_free_blocks_count;/* Free blocks count */
__le16 bg_free_inodes_count;/* Free inodes count */
__le16 bg_used_dirs_count; /* Directories count */
__le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
__u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
__le16 bg_itable_unused; /* Unused inodes count */
__le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
__le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
__le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
__le32 bg_inode_table_hi; /* Inodes table block MSB */
__le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
__le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
__le16 bg_used_dirs_count_hi; /* Directories count MSB */
__le16 bg_itable_unused_hi; /* Unused inodes count MSB */
__u32 bg_reserved2[3];
};
/*
* Structure of a flex block group info
*/
struct flex_groups {
__u32 free_inodes;
__u32 free_blocks;
};
#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
#define EXT4_MIN_BLOCK_SIZE 1024
#define EXT4_MIN_DESC_SIZE 32
#define EXT4_MIN_DESC_SIZE_64BIT 64
#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
#define EXT4_DESC_SIZE(s) (EXT3_SB(s)->s_desc_size)
/*
* Macro-instructions used to manage group descriptors
*/
#ifdef __KERNEL__
# define EXT3_BLOCKS_PER_GROUP(s) (EXT3_SB(s)->s_blocks_per_group)
# define EXT3_DESC_PER_BLOCK(s) (EXT3_SB(s)->s_desc_per_block)
# define EXT3_INODES_PER_GROUP(s) (EXT3_SB(s)->s_inodes_per_group)
# define EXT3_DESC_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_desc_per_block_bits)
# define EXT4_BLOCKS_PER_GROUP(s) (EXT3_SB(s)->s_blocks_per_group)
# define EXT4_DESC_PER_BLOCK(s) (EXT3_SB(s)->s_desc_per_block)
# define EXT4_INODES_PER_GROUP(s) (EXT3_SB(s)->s_inodes_per_group)
# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_desc_per_block_bits)
#else
# define EXT3_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
# define EXT3_DESC_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (struct ext3_group_desc))
# define EXT3_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
#endif
/*
* Constants relative to the data blocks
*/
#define EXT3_NDIR_BLOCKS 12
#define EXT3_IND_BLOCK EXT3_NDIR_BLOCKS
#define EXT3_DIND_BLOCK (EXT3_IND_BLOCK + 1)
#define EXT3_TIND_BLOCK (EXT3_DIND_BLOCK + 1)
#define EXT3_N_BLOCKS (EXT3_TIND_BLOCK + 1)
/*
* Inode flags
*/
#define EXT3_SECRM_FL 0x00000001 /* Secure deletion */
#define EXT3_UNRM_FL 0x00000002 /* Undelete */
#define EXT3_COMPR_FL 0x00000004 /* Compress file */
#define EXT3_SYNC_FL 0x00000008 /* Synchronous updates */
#define EXT3_IMMUTABLE_FL 0x00000010 /* Immutable file */
#define EXT3_APPEND_FL 0x00000020 /* writes to file may only append */
#define EXT3_NODUMP_FL 0x00000040 /* do not dump file */
#define EXT3_NOATIME_FL 0x00000080 /* do not update atime */
/* Reserved for compression usage... */
#define EXT3_DIRTY_FL 0x00000100
#define EXT3_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
#define EXT3_NOCOMPR_FL 0x00000400 /* Don't compress */
#define EXT3_ECOMPR_FL 0x00000800 /* Compression error */
/* End compression flags --- maybe not all used */
#define EXT3_INDEX_FL 0x00001000 /* hash-indexed directory */
#define EXT3_IMAGIC_FL 0x00002000 /* AFS directory */
#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
#define EXT3_NOTAIL_FL 0x00008000 /* file tail should not be merged */
#define EXT3_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
#define EXT3_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
#define EXT3_RESERVED_FL 0x80000000 /* reserved for ext3 lib */
#define EXT3_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
#define EXT3_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
/*
* Inode dynamic state flags
*/
#define EXT3_STATE_JDATA 0x00000001 /* journaled data exists */
#define EXT3_STATE_NEW 0x00000002 /* inode is newly created */
#define EXT3_STATE_XATTR 0x00000004 /* has in-inode xattrs */
/*
* Ext4 Inode flags
*/
#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
#define EXT4_UNRM_FL 0x00000002 /* Undelete */
#define EXT4_COMPR_FL 0x00000004 /* Compress file */
#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
/* Reserved for compression usage... */
#define EXT4_DIRTY_FL 0x00000100
#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
/* End compression flags --- maybe not all used */
#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
#define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */
#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
#define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
#define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
/* Used to pass group descriptor data when online resize is done */
struct ext3_new_group_input {
__u32 group; /* Group number for this data */
__u32 block_bitmap; /* Absolute block number of block bitmap */
__u32 inode_bitmap; /* Absolute block number of inode bitmap */
__u32 inode_table; /* Absolute block number of inode table start */
__u32 blocks_count; /* Total number of blocks in this group */
__u16 reserved_blocks; /* Number of reserved blocks in this group */
__u16 unused;
};
/* The struct ext3_new_group_input in kernel space, with free_blocks_count */
struct ext3_new_group_data {
__u32 group;
__u32 block_bitmap;
__u32 inode_bitmap;
__u32 inode_table;
__u32 blocks_count;
__u16 reserved_blocks;
__u16 unused;
__u32 free_blocks_count;
};
/*
* ioctl commands
*/
#define EXT3_IOC_GETFLAGS FS_IOC_GETFLAGS
#define EXT3_IOC_SETFLAGS FS_IOC_SETFLAGS
#define EXT3_IOC_GETVERSION _IOR('f', 3, long)
#define EXT3_IOC_SETVERSION _IOW('f', 4, long)
#define EXT3_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
#define EXT3_IOC_GROUP_ADD _IOW('f', 8,struct ext3_new_group_input)
#define EXT3_IOC_GETVERSION_OLD FS_IOC_GETVERSION
#define EXT3_IOC_SETVERSION_OLD FS_IOC_SETVERSION
#ifdef CONFIG_JBD_DEBUG
#define EXT3_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
#endif
#define EXT3_IOC_GETRSVSZ _IOR('f', 5, long)
#define EXT3_IOC_SETRSVSZ _IOW('f', 6, long)
/*
* ioctl commands in 32 bit emulation
*/
#define EXT3_IOC32_GETFLAGS FS_IOC32_GETFLAGS
#define EXT3_IOC32_SETFLAGS FS_IOC32_SETFLAGS
#define EXT3_IOC32_GETVERSION _IOR('f', 3, int)
#define EXT3_IOC32_SETVERSION _IOW('f', 4, int)
#define EXT3_IOC32_GETRSVSZ _IOR('f', 5, int)
#define EXT3_IOC32_SETRSVSZ _IOW('f', 6, int)
#define EXT3_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
#ifdef CONFIG_JBD_DEBUG
#define EXT3_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
#endif
#define EXT3_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
#define EXT3_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
/*
* Mount options
*/
struct ext3_mount_options {
unsigned long s_mount_opt;
uid_t s_resuid;
gid_t s_resgid;
unsigned long s_commit_interval;
#ifdef CONFIG_QUOTA
int s_jquota_fmt;
char *s_qf_names[MAXQUOTAS];
#endif
};
/*
* Structure of an inode on the disk
*/
struct ext3_inode {
__le16 i_mode; /* File mode */
__le16 i_uid; /* Low 16 bits of Owner Uid */
__le32 i_size; /* Size in bytes */
__le32 i_atime; /* Access time */
__le32 i_ctime; /* Creation time */
__le32 i_mtime; /* Modification time */
__le32 i_dtime; /* Deletion Time */
__le16 i_gid; /* Low 16 bits of Group Id */
__le16 i_links_count; /* Links count */
__le32 i_blocks; /* Blocks count */
__le32 i_flags; /* File flags */
union {
struct {
__le32 l_i_version;
} linux1;
struct {
__u32 h_i_translator;
} hurd1;
struct {
__u32 m_i_reserved1;
} masix1;
} osd1; /* OS dependent 1 */
__le32 i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
__le32 i_generation; /* File version (for NFS) */
__le32 i_file_acl_lo; /* File ACL */
__le32 i_size_high;
__le32 i_obso_faddr; /* Obsoleted fragment address */
union {
struct {
__le16 l_i_blocks_high; /* were l_i_reserved1 */
__le16 l_i_file_acl_high;
__le16 l_i_uid_high; /* these 2 fields */
__le16 l_i_gid_high; /* were reserved2[0] */
__u32 l_i_reserved2;
} linux2;
struct {
__le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
__u16 h_i_mode_high;
__u16 h_i_uid_high;
__u16 h_i_gid_high;
__u32 h_i_author;
} hurd2;
struct {
__le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
__le16 m_i_file_acl_high;
__u32 m_i_reserved2[2];
} masix2;
} osd2; /* OS dependent 2 */
__le16 i_extra_isize;
__le16 i_pad1;
__le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
__le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
__le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
__le32 i_crtime; /* File Creation time */
__le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
__le32 i_version_hi; /* high 32 bits for 64-bit version */
};
#define i_disk_version osd1.linux1.l_i_version
#if defined(__KERNEL__) || defined(__linux__)
#define i_reserved1 osd1.linux1.l_i_reserved1
#define i_file_acl_high osd2.linux2.l_i_file_acl_high
#define i_blocks_high osd2.linux2.l_i_blocks_high
#define i_uid_low i_uid
#define i_gid_low i_gid
#define i_uid_high osd2.linux2.l_i_uid_high
#define i_gid_high osd2.linux2.l_i_gid_high
#define i_reserved2 osd2.linux2.l_i_reserved2
#endif
/*
* File system states
*/
#define EXT3_VALID_FS 0x0001 /* Unmounted cleanly */
#define EXT3_ERROR_FS 0x0002 /* Errors detected */
#define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */
/*
* Mount flags
*/
#define EXT3_MOUNT_CHECK 0x00001 /* Do mount-time checks */
#define EXT3_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
#define EXT3_MOUNT_GRPID 0x00004 /* Create files with directory's group */
#define EXT3_MOUNT_DEBUG 0x00008 /* Some debugging messages */
#define EXT3_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
#define EXT3_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
#define EXT3_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
#define EXT3_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
#define EXT3_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
#define EXT3_MOUNT_ABORT 0x00200 /* Fatal error detected */
#define EXT3_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
#define EXT3_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
#define EXT3_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
#define EXT3_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
#define EXT3_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
#define EXT3_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
#define EXT3_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
#define EXT3_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
#define EXT3_MOUNT_RESERVATION 0x10000 /* Preallocation */
#define EXT3_MOUNT_BARRIER 0x20000 /* Use block barriers */
#define EXT3_MOUNT_NOBH 0x40000 /* No bufferheads */
#define EXT3_MOUNT_QUOTA 0x80000 /* Some quota option set */
#define EXT3_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
#define EXT3_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
/* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
#ifndef _LINUX_EXT2_FS_H
#define clear_opt(o, opt) o &= ~EXT3_MOUNT_##opt
#define set_opt(o, opt) o |= EXT3_MOUNT_##opt
#define test_opt(sb, opt) (EXT3_SB(sb)->s_mount_opt & \
EXT3_MOUNT_##opt)
#else
#define EXT2_MOUNT_NOLOAD EXT3_MOUNT_NOLOAD
#define EXT2_MOUNT_ABORT EXT3_MOUNT_ABORT
#define EXT2_MOUNT_DATA_FLAGS EXT3_MOUNT_DATA_FLAGS
#endif
#define ext3_set_bit ext2_set_bit
#define ext3_set_bit_atomic ext2_set_bit_atomic
#define ext3_clear_bit ext2_clear_bit
#define ext3_clear_bit_atomic ext2_clear_bit_atomic
#define ext3_test_bit ext2_test_bit
#define ext3_find_first_zero_bit ext2_find_first_zero_bit
#define ext3_find_next_zero_bit ext2_find_next_zero_bit
/*
* Maximal mount counts between two filesystem checks
*/
#define EXT3_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
#define EXT3_DFL_CHECKINTERVAL 0 /* Don't use interval check */
/*
* Behaviour when detecting errors
*/
#define EXT3_ERRORS_CONTINUE 1 /* Continue execution */
#define EXT3_ERRORS_RO 2 /* Remount fs read-only */
#define EXT3_ERRORS_PANIC 3 /* Panic */
#define EXT3_ERRORS_DEFAULT EXT3_ERRORS_CONTINUE
/*
* Structure of the super block
*/
struct ext3_super_block {
/*00*/
__le32 s_inodes_count; /* Inodes count */
__le32 s_blocks_count; /* Blocks count */
__le32 s_r_blocks_count; /* Reserved blocks count */
__le32 s_free_blocks_count; /* Free blocks count */
/*10*/
__le32 s_free_inodes_count; /* Free inodes count */
__le32 s_first_data_block; /* First Data Block */
__le32 s_log_block_size; /* Block size */
__le32 s_obso_log_frag_size; /* Obsoleted fragment size */
/*20*/
__le32 s_blocks_per_group; /* # Blocks per group */
__le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
__le32 s_inodes_per_group; /* # Inodes per group */
__le32 s_mtime; /* Mount time */
/*30*/
__le32 s_wtime; /* Write time */
__le16 s_mnt_count; /* Mount count */
__le16 s_max_mnt_count; /* Maximal mount count */
__le16 s_magic; /* Magic signature */
__le16 s_state; /* File system state */
__le16 s_errors; /* Behaviour when detecting errors */
__le16 s_minor_rev_level; /* minor revision level */
/*40*/
__le32 s_lastcheck; /* time of last check */
__le32 s_checkinterval; /* max. time between checks */
__le32 s_creator_os; /* OS */
__le32 s_rev_level; /* Revision level */
/*50*/
__le16 s_def_resuid; /* Default uid for reserved blocks */
__le16 s_def_resgid; /* Default gid for reserved blocks */
/*
* These fields are for EXT4_DYNAMIC_REV superblocks only.
*
* Note: the difference between the compatible feature set and
* the incompatible feature set is that if there is a bit set
* in the incompatible feature set that the kernel doesn't
* know about, it should refuse to mount the filesystem.
*
* e2fsck's requirements are more strict; if it doesn't know
* about a feature in either the compatible or incompatible
* feature set, it must abort and not try to meddle with
* things it doesn't understand...
*/
__le32 s_first_ino; /* First non-reserved inode */
__le16 s_inode_size; /* size of inode structure */
__le16 s_block_group_nr; /* block group # of this superblock */
__le32 s_feature_compat; /* compatible feature set */
/*60*/
__le32 s_feature_incompat; /* incompatible feature set */
__le32 s_feature_ro_compat; /* readonly-compatible feature set */
/*68*/
__u8 s_uuid[16]; /* 128-bit uuid for volume */
/*78*/
char s_volume_name[16]; /* volume name */
/*88*/
char s_last_mounted[64]; /* directory where last mounted */
/*C8*/
__le32 s_algorithm_usage_bitmap; /* For compression */
/*
* Performance hints. Directory preallocation should only
* happen if the EXT4_FEATURE_COMPAT_DIR_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 */
__le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
/*
* Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
*/
/*D0*/
__u8 s_journal_uuid[16]; /* uuid of journal superblock */
/*E0*/
__le32 s_journal_inum; /* inode number of journal file */
__le32 s_journal_dev; /* device number of journal file */
__le32 s_last_orphan; /* start of list of inodes to delete */
__le32 s_hash_seed[4]; /* HTREE hash seed */
__u8 s_def_hash_version; /* Default hash version to use */
__u8 s_reserved_char_pad;
__le16 s_desc_size; /* size of group descriptor */
/*100*/
__le32 s_default_mount_opts;
__le32 s_first_meta_bg; /* First metablock block group */
__le32 s_mkfs_time; /* When the filesystem was created */
__le32 s_jnl_blocks[17]; /* Backup of the journal inode */
/* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
/*150*/
__le32 s_blocks_count_hi; /* Blocks count */
__le32 s_r_blocks_count_hi; /* Reserved blocks count */
__le32 s_free_blocks_count_hi; /* Free blocks count */
__le16 s_min_extra_isize; /* All inodes have at least # bytes */
__le16 s_want_extra_isize; /* New inodes should reserve # bytes */
__le32 s_flags; /* Miscellaneous flags */
__le16 s_raid_stride; /* RAID stride */
__le16 s_mmp_interval; /* # seconds to wait in MMP checking */
__le64 s_mmp_block; /* Block for multi-mount protection */
__le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
__u8 s_log_groups_per_flex; /* FLEX_BG group size */
__u8 s_reserved_char_pad2;
__le16 s_reserved_pad;
__u32 s_reserved[162]; /* Padding to the end of the block */
};
#ifdef __KERNEL__
#include <linux/ext3_fs_i.h>
#include <linux/ext3_fs_sb.h>
static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
{
return sb->s_fs_info;
}
static inline struct inode *EXT3_I(struct inode *inode)
{
return inode;
}
static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino)
{
return ino == EXT3_ROOT_INO ||
ino == EXT3_JOURNAL_INO ||
ino == EXT3_RESIZE_INO ||
(ino >= EXT3_FIRST_INO(sb) &&
ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count));
}
#else
/* Assume that user mode programs are passing in an ext3fs superblock, not
* a kernel struct super_block. This will allow us to call the feature-test
* macros from user land. */
#define EXT3_SB(sb) (sb)
#endif
#define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
/*
* Codes for operating systems
*/
#define EXT3_OS_LINUX 0
#define EXT3_OS_HURD 1
#define EXT3_OS_MASIX 2
#define EXT3_OS_FREEBSD 3
#define EXT3_OS_LITES 4
/*
* Revision levels
*/
#define EXT3_GOOD_OLD_REV 0 /* The good old (original) format */
#define EXT3_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
#define EXT3_CURRENT_REV EXT3_GOOD_OLD_REV
#define EXT3_MAX_SUPP_REV EXT3_DYNAMIC_REV
#define EXT3_GOOD_OLD_INODE_SIZE 128
/*
* Feature set definitions
*/
#define EXT3_HAS_COMPAT_FEATURE(sb,mask) \
( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
#define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask) \
( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
#define EXT3_HAS_INCOMPAT_FEATURE(sb,mask) \
( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
#define EXT3_SET_COMPAT_FEATURE(sb,mask) \
EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
#define EXT3_SET_RO_COMPAT_FEATURE(sb,mask) \
EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
#define EXT3_SET_INCOMPAT_FEATURE(sb,mask) \
EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
#define EXT3_CLEAR_COMPAT_FEATURE(sb,mask) \
EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
#define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
#define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask) \
EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
#define EXT3_FEATURE_COMPAT_DIR_PREALLOC 0x0001
#define EXT3_FEATURE_COMPAT_IMAGIC_INODES 0x0002
#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
#define EXT3_FEATURE_COMPAT_EXT_ATTR 0x0008
#define EXT3_FEATURE_COMPAT_RESIZE_INODE 0x0010
#define EXT3_FEATURE_COMPAT_DIR_INDEX 0x0020
#define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
#define EXT3_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
#define EXT3_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
#define EXT3_FEATURE_INCOMPAT_COMPRESSION 0x0001
#define EXT3_FEATURE_INCOMPAT_FILETYPE 0x0002
#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
#define EXT3_FEATURE_INCOMPAT_META_BG 0x0010
#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
#define EXT3_FEATURE_INCOMPAT_MMP 0x0100
#define EXT3_FEATURE_INCOMPAT_DIRDATA 0x1000
#define EXT3_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* used by Lustre - ldiskfs */
#define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
#define EXT4_FEATURE_INCOMPAT_INLINEDATA 0x8000 /* data in inode */
#define EXT4_FEATURE_INCOMPAT_SUPP ( \
EXT4_FEATURE_INCOMPAT_FILETYPE| \
EXT4_FEATURE_INCOMPAT_RECOVER| \
EXT4_FEATURE_INCOMPAT_META_BG| \
EXT4_FEATURE_INCOMPAT_EXTENTS| \
EXT4_FEATURE_INCOMPAT_FLEX_BG)
#define EXT4_FEATURE_RO_COMPAT_SUPP ( \
EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
EXT4_FEATURE_RO_COMPAT_BTREE_DIR | \
EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
/*
* Default values for user and/or group using reserved blocks
*/
#define EXT3_DEF_RESUID 0
#define EXT3_DEF_RESGID 0
/*
* Default mount options
*/
#define EXT3_DEFM_DEBUG 0x0001
#define EXT3_DEFM_BSDGROUPS 0x0002
#define EXT3_DEFM_XATTR_USER 0x0004
#define EXT3_DEFM_ACL 0x0008
#define EXT3_DEFM_UID16 0x0010
#define EXT3_DEFM_JMODE 0x0060
#define EXT3_DEFM_JMODE_DATA 0x0020
#define EXT3_DEFM_JMODE_ORDERED 0x0040
#define EXT3_DEFM_JMODE_WBACK 0x0060
/*
* Structure of a directory entry
*/
#define EXT3_NAME_LEN 255
struct ext3_dir_entry {
__le32 inode; /* Inode number */
__le16 rec_len; /* Directory entry length */
__le16 name_len; /* Name length */
char name[EXT3_NAME_LEN]; /* File name */
};
/*
* The new version of the directory entry. Since EXT3 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 ext3_dir_entry_2 {
__le32 inode; /* Inode number */
__le16 rec_len; /* Directory entry length */
__u8 name_len; /* Name length */
__u8 file_type;
char name[EXT3_NAME_LEN]; /* File name */
};
/*
* Ext3 directory file types. Only the low 3 bits are used. The
* other bits are reserved for now.
*/
#define EXT3_FT_UNKNOWN 0
#define EXT3_FT_REG_FILE 1
#define EXT3_FT_DIR 2
#define EXT3_FT_CHRDEV 3
#define EXT3_FT_BLKDEV 4
#define EXT3_FT_FIFO 5
#define EXT3_FT_SOCK 6
#define EXT3_FT_SYMLINK 7
#define EXT3_FT_MAX 8
#define EXT3_FT_MASK 0xf
#if EXT3_FT_MAX > EXT3_FT_MASK
#error "conflicting EXT3_FT_MAX and EXT3_FT_MASK"
#endif
#define EXT3_LUFID_MAGIC 0xAD200907UL
#pragma pack(1)
struct ext3_dentry_param {
__u32 edp_magic; /* EXT3_LUFID_MAGIC */
char edp_len; /* size of edp_data in bytes */
char edp_data[0]; /* packed array of data */
} __attribute__((packed));
#pragma pack()
static inline unsigned char *ext3_dentry_get_data(struct super_block *sb,
struct ext3_dentry_param* p)
{
if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_DIRDATA))
return NULL;
if (p && p->edp_magic == EXT3_LUFID_MAGIC)
return &p->edp_len;
else
return NULL;
}
/*
* Compute the total directory entry data length.
* This includes the filename and an implicit NUL terminator (always present),
* and optional extensions. Each extension has a bit set in the high 4 bits of
* de->file_type, and the extension length is the first byte in each entry.
*/
static inline int ext3_get_dirent_data_len(struct ext3_dir_entry_2 *de)
{
char *len = de->name + de->name_len + 1 /* NUL terminator */;
int dlen = 0;
__u8 extra_data_flags = (de->file_type & ~EXT3_FT_MASK) >> 4;
while (extra_data_flags) {
if (extra_data_flags & 1) {
dlen += *len + (dlen == 0);
len += *len;
}
extra_data_flags >>= 1;
}
return dlen;
}
/*
* d_type has 4 unused bits, so it can hold four types data. these different
* type of data (e.g. lustre data, high 32 bits of 64-bit inode number) can be
* stored, in flag order, after file-name in ext3 dirent.
*/
/*
* this flag is added to d_type if ext3 dirent has extra data after
* filename. this data length is variable and length is stored in first byte
* of data. data start after filename NUL byte.
* This is used by Lustre FS.
*/
#define EXT3_DIRENT_LUFID 0x10
/*
* EXT3_DIR_PAD defines the directory entries boundaries
*
* NOTE: It must be a multiple of 4
*/
#define EXT3_DIR_PAD 4
#define EXT3_DIR_ROUND (EXT3_DIR_PAD - 1)
#define EXT3_DIR_REC_LEN(len) (((len) + 8 + EXT3_DIR_ROUND) & \
~EXT3_DIR_ROUND)
#define EXT3_MAX_REC_LEN ((1<<16)-1)
static inline unsigned ext3_rec_len_from_disk(__le16 dlen)
{
unsigned len = le16_to_cpu(dlen);
if (len == EXT3_MAX_REC_LEN || len == 0)
return 1 << 16;
return len;
}
static inline __le16 ext3_rec_len_to_disk(unsigned len)
{
if (len == (1 << 16))
return cpu_to_le16(EXT3_MAX_REC_LEN);
else if (len > (1 << 16))
BUG();
return cpu_to_le16(len);
}
/*
* Hash Tree Directory indexing
* (c) Daniel Phillips, 2001
*/
#ifdef EXT2_HTREE_INDEX
#define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
EXT3_FEATURE_COMPAT_DIR_INDEX) && \
(EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
#define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
#define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
#else
#define is_dx(dir) 0
#define EXT3_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT3_LINK_MAX)
#define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
#endif
/* Legal values for the dx_root hash_version field: */
#define DX_HASH_LEGACY 0
#define DX_HASH_HALF_MD4 1
#define DX_HASH_TEA 2
#define DX_HASH_LEGACY_UNSIGNED 3
#define DX_HASH_HALF_MD4_UNSIGNED 4
#define DX_HASH_TEA_UNSIGNED 5
#ifdef __KERNEL__
/* hash info structure used by the directory hash */
struct dx_hash_info
{
u32 hash;
u32 minor_hash;
int hash_version;
u32 *seed;
};
#define EXT3_HTREE_EOF 0x7fffffff
/* 32 and 64 bit signed EOF for dx directories */
#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1
/*
* Control parameters used by ext3_htree_next_block
*/
#define HASH_NB_ALWAYS 1
/*
* Describe an inode's exact location on disk and in memory
*/
struct ext3_iloc
{
struct buffer_head *bh;
unsigned long offset;
unsigned long block_group;
};
static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
{
return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
}
/*
* This structure is stuffed into the struct file's private_data field
* for directories. It is where we put information so that we can do
* readdir operations in hash tree order.
*/
struct dir_private_info {
struct rb_root root;
struct rb_node *curr_node;
struct fname *extra_fname;
loff_t last_pos;
__u32 curr_hash;
__u32 curr_minor_hash;
__u32 next_hash;
};
/* calculate the first block number of the group */
static inline ext3_fsblk_t
ext3_group_first_block_no(struct super_block *sb, unsigned long group_no)
{
return group_no * (ext3_fsblk_t)EXT3_BLOCKS_PER_GROUP(sb) +
le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block);
}
/*
* Special error return code only used by dx_probe() and its callers.
*/
#define ERR_BAD_DX_DIR -75000
/*
* This structure will be used for multiple mount protection. It will be
* written into the block number saved in the s_mmp_block field in the
* superblock. Programs that check MMP should assume that if
* SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
* to use the filesystem, regardless of how old the timestamp is.
*/
#define EXT3_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
#define EXT3_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
#define EXT3_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
#define EXT3_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
struct mmp_struct {
__le32 mmp_magic;
__le32 mmp_seq;
__le64 mmp_time;
char mmp_nodename[64];
char mmp_bdevname[32];
__le16 mmp_check_interval;
__le16 mmp_pad1;
__le32 mmp_pad2[227];
};
/*
* Default interval in seconds to update the MMP sequence number.
*/
#define EXT3_MMP_UPDATE_INTERVAL 1
/*
* Minimum interval for MMP checking in seconds.
*/
#define EXT3_MMP_MIN_CHECK_INTERVAL 5
/*
* Indicates that ctime should not be updated in ext3_xattr_set_handle()
*/
#ifndef XATTR_NO_CTIME
#define XATTR_NO_CTIME 0x80
#endif
/*
* NOTE! unlike strncmp, ext3_match returns 1 for success, 0 for failure.
*
* `len <= EXT3_NAME_LEN' is guaranteed by caller.
* `de != NULL' is guaranteed by caller.
*/
static inline int ext3_match (int len, const char * const name,
struct ext3_dir_entry_2 * de)
{
if (len != de->name_len)
return 0;
if (!de->inode)
return 0;
return !_strnicmp(name, de->name, len);
}
#endif /* __KERNEL__ */
#endif /* _LINUX_EXT3_FS_H */