*/
#define EXT2_BAD_INO 1 /* Bad blocks inode */
#define EXT2_ROOT_INO 2 /* Root inode */
-#define EXT2_ACL_IDX_INO 3 /* ACL inode */
-#define EXT2_ACL_DATA_INO 4 /* ACL inode */
+#define EXT4_USR_QUOTA_INO 3 /* User quota inode */
+#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
#define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */
#define EXT2_JOURNAL_INO 8 /* Journal inode */
+#define EXT2_EXCLUDE_INO 9 /* The "exclude" inode, for snapshots */
+#define EXT4_REPLICA_INO 10 /* Used by non-upstream feature */
/* First non-reserved inode for old ext2 filesystems */
#define EXT2_GOOD_OLD_FIRST_INO 11
#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32))
/*
+ * Macro-instructions used to manage allocation clusters
+ */
+#define EXT2_MIN_CLUSTER_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE
+#define EXT2_MAX_CLUSTER_LOG_SIZE 29 /* 512MB */
+#define EXT2_MIN_CLUSTER_SIZE EXT2_MIN_BLOCK_SIZE
+#define EXT2_MAX_CLUSTER_SIZE (1 << EXT2_MAX_CLUSTER_LOG_SIZE)
+#define EXT2_CLUSTER_SIZE(s) (EXT2_MIN_BLOCK_SIZE << \
+ (s)->s_log_cluster_size)
+#define EXT2_CLUSTER_SIZE_BITS(s) ((s)->s_log_cluster_size + 10)
+
+/*
* Macro-instructions used to manage fragments
+ *
+ * Note: for backwards compatibility only, for the dump program.
+ * Ext2/3/4 will never support fragments....
*/
-#define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE
-#define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE
-#define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE
-#ifdef __KERNEL__
-# define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size)
-# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block)
-#else
-# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
-# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
-#endif
+#define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE
+#define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE
+#define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE
+#define EXT2_FRAG_SIZE(s) EXT2_BLOCK_SIZE(s)
+#define EXT2_FRAGS_PER_BLOCK(s) 1
/*
* ACL structures
__u16 bg_free_inodes_count; /* Free inodes count */
__u16 bg_used_dirs_count; /* Directories count */
__u16 bg_flags;
- __u32 bg_reserved[2];
+ __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
+ __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
+ __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
__u16 bg_itable_unused; /* Unused inodes count */
- __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/
+ __u16 bg_checksum; /* crc16(s_uuid+group_num+group_desc)*/
};
+/*
+ * Structure of a blocks group descriptor
+ */
struct ext4_group_desc
{
__u32 bg_block_bitmap; /* Blocks bitmap block */
__u16 bg_free_blocks_count; /* Free blocks count */
__u16 bg_free_inodes_count; /* Free inodes count */
__u16 bg_used_dirs_count; /* Directories count */
- __u16 bg_flags;
- __u32 bg_reserved[2];
+ __u16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
+ __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
+ __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
+ __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
__u16 bg_itable_unused; /* Unused inodes count */
- __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/
+ __u16 bg_checksum; /* crc16(sb_uuid+group+desc) */
__u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
__u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
__u32 bg_inode_table_hi; /* Inodes table block MSB */
__u16 bg_free_blocks_count_hi;/* Free blocks count MSB */
__u16 bg_free_inodes_count_hi;/* Free inodes count MSB */
__u16 bg_used_dirs_count_hi; /* Directories count MSB */
- __u16 bg_pad;
- __u32 bg_reserved2[3];
+ __u16 bg_itable_unused_hi; /* Unused inodes count MSB */
+ __u32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
+ __u16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */
+ __u16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */
+ __u32 bg_reserved;
};
+#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
+ (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
+ sizeof(__u16))
+#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_LOCATION \
+ (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
+ sizeof(__u16))
+
#define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */
#define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */
#define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
__u16 count;
};
+/*
+ * This goes at the end of each htree block.
+ */
+struct ext2_dx_tail {
+ __u32 dt_reserved;
+ __u32 dt_checksum; /* crc32c(uuid+inum+dxblock) */
+};
/*
* Macro-instructions used to manage group descriptors
#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
+#define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_SB(s)->s_clusters_per_group)
#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s))
/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */
-#define EXT2_MAX_BLOCKS_PER_GROUP(s) ((1 << 16) - 8)
-#define EXT2_MAX_INODES_PER_GROUP(s) ((1 << 16) - EXT2_INODES_PER_BLOCK(s))
+#define EXT2_MAX_BLOCKS_PER_GROUP(s) ((((unsigned) 1 << 16) - 8) * \
+ (EXT2_CLUSTER_SIZE(s) / \
+ EXT2_BLOCK_SIZE(s)))
+#define EXT2_MAX_CLUSTERS_PER_GROUP(s) (((unsigned) 1 << 16) - 8)
+#define EXT2_MAX_INODES_PER_GROUP(s) (((unsigned) 1 << 16) - \
+ EXT2_INODES_PER_BLOCK(s))
#ifdef __KERNEL__
#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block)
#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
-#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
+/* EXT4_EOFBLOCKS_FL 0x00400000 was here */
+#define FS_NOCOW_FL 0x00800000 /* Do not cow file */
+#define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */
+#define EXT4_SNAPFILE_DELETED_FL 0x04000000 /* Snapshot is being deleted */
+#define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 /* Snapshot shrink has completed */
+#define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data */
#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
#define EXT2_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
#define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
#define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input)
#define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
+#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
/*
* Structure of an inode on the disk
__u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
__u32 i_generation; /* File version (for NFS) */
__u32 i_file_acl; /* File ACL */
- __u32 i_dir_acl; /* Directory ACL */
+ __u32 i_size_high; /* Formerly i_dir_acl, directory ACL */
__u32 i_faddr; /* Fragment address */
union {
struct {
__u16 l_i_file_acl_high;
__u16 l_i_uid_high; /* these 2 fields */
__u16 l_i_gid_high; /* were reserved2[0] */
- __u32 l_i_reserved2;
+ __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */
+ __u16 l_i_reserved;
} linux2;
struct {
__u8 h_i_frag; /* Fragment number */
__u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
__u32 i_generation; /* File version (for NFS) */
__u32 i_file_acl; /* File ACL */
- __u32 i_dir_acl; /* Directory ACL */
+ __u32 i_size_high; /* Formerly i_dir_acl, directory ACL */
__u32 i_faddr; /* Fragment address */
union {
struct {
__u16 l_i_file_acl_high;
__u16 l_i_uid_high; /* these 2 fields */
__u16 l_i_gid_high; /* were reserved2[0] */
- __u32 l_i_reserved2;
+ __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */
+ __u16 l_i_reserved;
} linux2;
struct {
__u8 h_i_frag; /* Fragment number */
} hurd2;
} osd2; /* OS dependent 2 */
__u16 i_extra_isize;
- __u16 i_pad1;
+ __u16 i_checksum_hi; /* crc32c(uuid+inum+inode) */
__u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
__u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */
__u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
__u32 i_version_hi; /* high 32 bits for 64-bit version */
};
-#define i_size_high i_dir_acl
+#define EXT4_INODE_CSUM_HI_EXTRA_END \
+ (offsetof(struct ext2_inode_large, i_checksum_hi) + sizeof(__u16) - \
+ EXT2_GOOD_OLD_INODE_SIZE)
+
+#define i_dir_acl i_size_high
+
+#define i_checksum_lo osd2.linux2.l_i_checksum_lo
#if defined(__KERNEL__) || defined(__linux__)
#define i_reserved1 osd1.linux1.l_i_reserved1
#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
#else
#if defined(__GNU__)
#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */
+#define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */
+#define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */
+#define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */
/*
* Mount flags
#define EXT2_ERRORS_PANIC 3 /* Panic */
#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
+#if (__GNUC__ >= 4)
+#define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER)
+#else
+#define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
+#endif
+
+/* Metadata checksum algorithms */
+#define EXT2_CRC32C_CHKSUM 1
+
/*
* Structure of the super block
*/
__u32 s_free_inodes_count; /* Free inodes count */
__u32 s_first_data_block; /* First Data Block */
__u32 s_log_block_size; /* Block size */
- __s32 s_log_frag_size; /* Fragment size */
+ __u32 s_log_cluster_size; /* Allocation cluster size */
__u32 s_blocks_per_group; /* # Blocks per group */
- __u32 s_frags_per_group; /* # Fragments per group */
+ __u32 s_clusters_per_group; /* # Fragments per group */
__u32 s_inodes_per_group; /* # Inodes per group */
__u32 s_mtime; /* Mount time */
__u32 s_wtime; /* Write time */
__u16 s_want_extra_isize; /* New inodes should reserve # bytes */
__u32 s_flags; /* Miscellaneous flags */
__u16 s_raid_stride; /* RAID stride */
- __u16 s_mmp_interval; /* # seconds to wait in MMP checking */
+ __u16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
__u64 s_mmp_block; /* Block for multi-mount protection */
__u32 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_pad;
+ __u8 s_checksum_type; /* metadata checksum algorithm */
__u16 s_reserved_pad; /* Padding to next 32bits */
__u64 s_kbytes_written; /* nr of lifetime kilobytes written */
- __u32 s_reserved[160]; /* Padding to the end of the block */
+ __u32 s_snapshot_inum; /* Inode number of active snapshot */
+ __u32 s_snapshot_id; /* sequential ID of active snapshot */
+ __u64 s_snapshot_r_blocks_count; /* reserved blocks for active
+ snapshot's future use */
+ __u32 s_snapshot_list; /* inode number of the head of the on-disk snapshot list */
+#define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count)
+ __u32 s_error_count; /* number of fs errors */
+ __u32 s_first_error_time; /* first time an error happened */
+ __u32 s_first_error_ino; /* inode involved in first error */
+ __u64 s_first_error_block; /* block involved of first error */
+ __u8 s_first_error_func[32]; /* function where the error happened */
+ __u32 s_first_error_line; /* line number where error happened */
+ __u32 s_last_error_time; /* most recent time of an error */
+ __u32 s_last_error_ino; /* inode involved in last error */
+ __u32 s_last_error_line; /* line number where error happened */
+ __u64 s_last_error_block; /* block involved of last error */
+ __u8 s_last_error_func[32]; /* function where the error happened */
+#define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts)
+ __u8 s_mount_opts[64];
+ __u32 s_usr_quota_inum; /* inode number of user quota file */
+ __u32 s_grp_quota_inum; /* inode number of group quota file */
+ __u32 s_overhead_blocks; /* overhead blocks/clusters in fs */
+ __u32 s_reserved[108]; /* Padding to the end of the block */
+ __u32 s_checksum; /* crc32c(superblock) */
};
+#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
+
/*
* Codes for operating systems
*/
#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010
#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
#define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040
+/* #define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 not used, legacy */
+#define EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP 0x0100
+
#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
+#define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080
+#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
+#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
+/*
+ * METADATA_CSUM implies GDT_CSUM. When METADATA_CSUM is set, group
+ * descriptor checksums use the same algorithm as all other data
+ * structures' checksums.
+ */
+#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
+#define EXT4_FEATURE_RO_COMPAT_REPLICA 0x0800
#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400
#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000
-
+/* 0x2000 was EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM but this was never used */
+#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
+#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
#define EXT2_FEATURE_COMPAT_SUPP 0
-#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE)
+#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
+ EXT4_FEATURE_INCOMPAT_MMP)
#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \
#define EXT3_DEFM_JMODE_DATA 0x0020
#define EXT3_DEFM_JMODE_ORDERED 0x0040
#define EXT3_DEFM_JMODE_WBACK 0x0060
+#define EXT4_DEFM_NOBARRIER 0x0100
+#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
+#define EXT4_DEFM_DISCARD 0x0400
+#define EXT4_DEFM_NODELALLOC 0x0800
/*
* Structure of a directory entry
* 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.
+ *
+ * This structure is deprecated due to endianity issues. Please use struct
+ * ext2_dir_entry and accessor functions
+ * ext2fs_dirent_name_len
+ * ext2fs_dirent_set_name_len
+ * ext2fs_dirent_file_type
+ * ext2fs_dirent_set_file_type
+ * to get and set name_len and file_type fields.
*/
struct ext2_dir_entry_2 {
__u32 inode; /* Inode number */
};
/*
+ * This is a bogus directory entry at the end of each leaf block that
+ * records checksums.
+ */
+struct ext2_dir_entry_tail {
+ __u32 det_reserved_zero1; /* Pretend to be unused */
+ __u16 det_rec_len; /* 12 */
+ __u16 det_reserved_name_len; /* 0xDE00, fake namelen/filetype */
+ __u32 det_checksum; /* crc32c(uuid+inode+dirent) */
+};
+
+/*
* Ext2 directory file types. Only the low 3 bits are used. The
* other bits are reserved for now.
*/
#define EXT2_FT_MAX 8
/*
+ * Annoyingly, e2fsprogs always swab16s ext2_dir_entry.name_len, so we
+ * have to build ext2_dir_entry_tail with that assumption too. This
+ * constant helps to build the dir_entry_tail to look like it has an
+ * "invalid" file type.
+ */
+#define EXT2_DIR_NAME_LEN_CSUM 0xDE00
+
+/*
* EXT2_DIR_PAD defines the directory entries boundaries
*
* NOTE: It must be a multiple of 4
~EXT2_DIR_ROUND)
/*
- * 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.
+ * This structure is used for multiple mount protection. It is 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.
+ *
+ * The timestamp in the MMP structure will be updated by e2fsck at some
+ * arbitary intervals (start of passes, after every few groups of inodes
+ * in pass1 and pass1b). There is no guarantee that e2fsck is updating
+ * the MMP block in a timely manner, and the updates it does are purely
+ * for the convenience of the sysadmin and not for automatic validation.
+ *
+ * Note: Only the mmp_seq value is used to determine whether the MMP block
+ * is being updated. The mmp_time, mmp_nodename, and mmp_bdevname
+ * fields are only for informational purposes for the administrator,
+ * due to clock skew between nodes and hostname HA service takeover.
*/
-#define EXT2_MMP_MAGIC 0x004D4D50 /* ASCII for MMP */
-#define EXT2_MMP_CLEAN 0xFF4D4D50 /* Value of mmp_seq for clean unmount */
-#define EXT2_MMP_FSCK_ON 0xE24D4D50 /* Value of mmp_seq when being fscked */
+#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
+#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
+#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
+#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
struct mmp_struct {
- __u32 mmp_magic;
- __u32 mmp_seq;
- __u64 mmp_time;
- char mmp_nodename[64];
- char mmp_bdevname[32];
- __u16 mmp_interval;
+ __u32 mmp_magic; /* Magic number for MMP */
+ __u32 mmp_seq; /* Sequence no. updated periodically */
+ __u64 mmp_time; /* Time last updated */
+ char mmp_nodename[64]; /* Node which last updated MMP block */
+ char mmp_bdevname[32]; /* Bdev which last updated MMP block */
+ __u16 mmp_check_interval; /* Changed mmp_check_interval */
__u16 mmp_pad1;
- __u32 mmp_pad2;
+ __u32 mmp_pad2[226];
+ __u32 mmp_checksum; /* crc32c(uuid+mmp_block) */
};
/*
- * Interval in number of seconds to update the MMP sequence number.
+ * Default interval for MMP update in seconds.
+ */
+#define EXT4_MMP_UPDATE_INTERVAL 5
+
+/*
+ * Maximum interval for MMP update in seconds.
+ */
+#define EXT4_MMP_MAX_UPDATE_INTERVAL 300
+
+/*
+ * Minimum interval for MMP checking in seconds.
*/
-#define EXT2_MMP_DEF_INTERVAL 5
+#define EXT4_MMP_MIN_CHECK_INTERVAL 5
#endif /* _LINUX_EXT2_FS_H */
git://git.whamcloud.com / tools / e2fsprogs.git / blobdiff