#include <ext2fs/ext2_types.h> /* Changed from linux/types.h */
+#ifndef __GNUC_PREREQ
+#if defined(__GNUC__) && defined(__GNUC_MINOR__)
+#define __GNUC_PREREQ(maj, min) \
+ ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
+#else
+#define __GNUC_PREREQ(maj, min) 0
+#endif
+#endif
+
/*
* The second extended filesystem constants/structures
*/
*/
#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)*/
};
/*
__u16 bg_free_inodes_count; /* Free inodes count */
__u16 bg_used_dirs_count; /* Directories count */
__u16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
- __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
+ __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(sb_uuid+group+desc) */
__u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
__u16 bg_free_inodes_count_hi;/* Free inodes count MSB */
__u16 bg_used_dirs_count_hi; /* Directories count MSB */
__u16 bg_itable_unused_hi; /* Unused inodes count MSB */
- __u32 bg_reserved2[3];
+ __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 */
#define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */
#define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */
#define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */
+#define EXT2_HASH_SIPHASH 6
#define EXT2_HASH_FLAG_INCOMPAT 0x1
+#define EXT4_DX_BLOCK_MASK 0x0fffffff
+
struct ext2_dx_entry {
- __u32 hash;
- __u32 block;
+ __le32 hash;
+ __le32 block;
};
struct ext2_dx_countlimit {
- __u16 limit;
- __u16 count;
+ __le16 limit;
+ __le16 count;
};
+/*
+ * This goes at the end of each htree block.
+ */
+struct ext2_dx_tail {
+ __le32 dt_reserved;
+ __le32 dt_checksum; /* crc32c(uuid+inum+dxblock) */
+};
/*
* Macro-instructions used to manage group descriptors
#define EXT2_MIN_DESC_SIZE_64BIT 64
#define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE
#define EXT2_DESC_SIZE(s) \
- ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \
- (s)->s_desc_size : EXT2_MIN_DESC_SIZE)
+ (ext2fs_has_feature_64bit(s) ? (s)->s_desc_size : EXT2_MIN_DESC_SIZE)
#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 EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s))
#endif
+#define EXT2_GROUPS_TO_BLOCKS(s, g) ((blk64_t) EXT2_BLOCKS_PER_GROUP(s) * \
+ (g))
+#define EXT2_GROUPS_TO_CLUSTERS(s, g) ((blk64_t) EXT2_CLUSTERS_PER_GROUP(s) * \
+ (g))
+
/*
* Constants relative to the data blocks
*/
#define EXT2_DIRTY_FL 0x00000100
#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */
-#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */
+ /* nb: was previously EXT2_ECOMPR_FL */
+#define EXT4_ENCRYPT_FL 0x00000800 /* encrypted inode */
/* End compression flags --- maybe not all used */
#define EXT2_BTREE_FL 0x00001000 /* btree format dir */
#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */
#define EXT2_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_VERITY_FL 0x00100000 /* Verity protected inode */
+#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
+/* 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 FS_DAX_FL 0x02000000 /* Inode is DAX */
+#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 EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
+#define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded file */
#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
-#define EXT2_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
-#define EXT2_FL_USER_MODIFIABLE 0x000080FF /* User modifiable flags */
+#define EXT2_FL_USER_VISIBLE 0x604BDFFF /* User visible flags */
+#define EXT2_FL_USER_MODIFIABLE 0x604B80FF /* User modifiable flags */
/*
* ioctl commands
#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
*/
struct ext2_inode {
- __u16 i_mode; /* File mode */
+/*00*/ __u16 i_mode; /* File mode */
__u16 i_uid; /* Low 16 bits of Owner Uid */
__u32 i_size; /* Size in bytes */
__u32 i_atime; /* Access time */
__u32 i_ctime; /* Inode change time */
- __u32 i_mtime; /* Modification time */
+/*10*/ __u32 i_mtime; /* Modification time */
__u32 i_dtime; /* Deletion Time */
__u16 i_gid; /* Low 16 bits of Group Id */
__u16 i_links_count; /* Links count */
__u32 i_blocks; /* Blocks count */
- __u32 i_flags; /* File flags */
+/*20*/ __u32 i_flags; /* File flags */
union {
struct {
__u32 l_i_version; /* was l_i_reserved1 */
__u32 h_i_translator;
} hurd1;
} osd1; /* OS dependent 1 */
- __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
- __u32 i_generation; /* File version (for NFS) */
+/*28*/ __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
+/*64*/ __u32 i_generation; /* File version (for NFS) */
__u32 i_file_acl; /* File ACL */
- __u32 i_dir_acl; /* Directory ACL */
- __u32 i_faddr; /* Fragment address */
+ __u32 i_size_high;
+/*70*/ __u32 i_faddr; /* Fragment address */
union {
struct {
__u16 l_i_blocks_hi;
__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 */
* Permanent part of an large inode on the disk
*/
struct ext2_inode_large {
- __u16 i_mode; /* File mode */
+/*00*/ __u16 i_mode; /* File mode */
__u16 i_uid; /* Low 16 bits of Owner Uid */
__u32 i_size; /* Size in bytes */
__u32 i_atime; /* Access time */
__u32 i_ctime; /* Inode Change time */
- __u32 i_mtime; /* Modification time */
+/*10*/ __u32 i_mtime; /* Modification time */
__u32 i_dtime; /* Deletion Time */
__u16 i_gid; /* Low 16 bits of Group Id */
__u16 i_links_count; /* Links count */
__u32 i_blocks; /* Blocks count */
- __u32 i_flags; /* File flags */
+/*20*/ __u32 i_flags; /* File flags */
union {
struct {
__u32 l_i_version; /* was l_i_reserved1 */
__u32 h_i_translator;
} hurd1;
} osd1; /* OS dependent 1 */
- __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
- __u32 i_generation; /* File version (for NFS) */
+/*28*/ __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
+/*64*/ __u32 i_generation; /* File version (for NFS) */
__u32 i_file_acl; /* File ACL */
- __u32 i_dir_acl; /* Directory ACL */
- __u32 i_faddr; /* Fragment address */
+ __u32 i_size_high;
+/*70*/ __u32 i_faddr; /* Fragment address */
union {
struct {
__u16 l_i_blocks_hi;
__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 h_i_author;
} hurd2;
} osd2; /* OS dependent 2 */
- __u16 i_extra_isize;
- __u16 i_pad1;
+/*80*/ __u16 i_extra_isize;
+ __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_crtime; /* File creation time */
+/*90*/ __u32 i_crtime; /* File creation time */
__u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/
__u32 i_version_hi; /* high 32 bits for 64-bit version */
+/*9c*/ __u32 i_projid; /* Project ID */
};
-#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 EXT4_EPOCH_BITS 2
+#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
+
+#define i_checksum_lo osd2.linux2.l_i_checksum_lo
+
+#define inode_includes(size, field) \
+ (size >= (sizeof(((struct ext2_inode_large *)0)->field) + \
+ offsetof(struct ext2_inode_large, field)))
+
+#define EXT2_FITS_IN_INODE(inode, field) \
+ ((offsetof(struct ext2_inode_large, field) + \
+ sizeof((inode)->field)) <= \
+ (EXT2_GOOD_OLD_INODE_SIZE + \
+ (inode)->i_extra_isize)) \
#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 inode_uid(inode) ((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16)
#define inode_gid(inode) ((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16)
+#define inode_projid(inode) ((inode).i_projid)
#define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x))
#define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x))
+static inline
+struct ext2_inode *EXT2_INODE(struct ext2_inode_large *large_inode)
+{
+ return (struct ext2_inode *) large_inode;
+}
+
/*
* File system states
*/
#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
#define EXT2_ERROR_FS 0x0002 /* Errors detected */
#define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */
+#define EXT4_FC_REPLAY 0x0020 /* Ext4 fast commit replay ongoing */
/*
* Misc. filesystem flags
#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
+
+/* Encryption algorithms, key size and key reference len */
+#define EXT4_ENCRYPTION_MODE_INVALID 0
+#define EXT4_ENCRYPTION_MODE_AES_256_XTS 1
+#define EXT4_ENCRYPTION_MODE_AES_256_GCM 2
+#define EXT4_ENCRYPTION_MODE_AES_256_CBC 3
+#define EXT4_ENCRYPTION_MODE_AES_256_CTS 4
+
+#define EXT4_AES_256_XTS_KEY_SIZE 64
+#define EXT4_AES_256_GCM_KEY_SIZE 32
+#define EXT4_AES_256_CBC_KEY_SIZE 32
+#define EXT4_AES_256_CTS_KEY_SIZE 32
+#define EXT4_MAX_KEY_SIZE 64
+
+#define EXT4_KEY_DESCRIPTOR_SIZE 8
+#define EXT4_CRYPTO_BLOCK_SIZE 16
+
+/* Password derivation constants */
+#define EXT4_MAX_PASSPHRASE_SIZE 1024
+#define EXT4_MAX_SALT_SIZE 256
+#define EXT4_PBKDF2_ITERATIONS 0xFFFF
+
+#define EXT2_LABEL_LEN 16
+
+/*
+ * Policy provided via an ioctl on the topmost directory. This
+ * structure is also in the kernel.
+ */
+struct ext4_encryption_policy {
+ char version;
+ char contents_encryption_mode;
+ char filenames_encryption_mode;
+ char flags;
+ char master_key_descriptor[EXT4_KEY_DESCRIPTOR_SIZE];
+} __attribute__((__packed__));
+
+struct ext4_encryption_key {
+ __u32 mode;
+ char raw[EXT4_MAX_KEY_SIZE];
+ __u32 size;
+} __attribute__((__packed__));
+
/*
* Structure of the super block
*/
struct ext2_super_block {
- __u32 s_inodes_count; /* Inodes count */
+/*000*/ __u32 s_inodes_count; /* Inodes count */
__u32 s_blocks_count; /* Blocks count */
__u32 s_r_blocks_count; /* Reserved blocks count */
__u32 s_free_blocks_count; /* Free blocks count */
- __u32 s_free_inodes_count; /* Free inodes count */
+/*010*/ __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_blocks_per_group; /* # Blocks per group */
- __u32 s_frags_per_group; /* # Fragments per group */
+ __u32 s_log_cluster_size; /* Allocation cluster size */
+/*020*/ __u32 s_blocks_per_group; /* # Blocks 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 */
+/*030*/ __u32 s_wtime; /* Write time */
__u16 s_mnt_count; /* Mount count */
__s16 s_max_mnt_count; /* Maximal mount count */
__u16 s_magic; /* Magic signature */
__u16 s_state; /* File system state */
__u16 s_errors; /* Behaviour when detecting errors */
__u16 s_minor_rev_level; /* minor revision level */
- __u32 s_lastcheck; /* time of last check */
+/*040*/ __u32 s_lastcheck; /* time of last check */
__u32 s_checkinterval; /* max. time between checks */
__u32 s_creator_os; /* OS */
__u32 s_rev_level; /* Revision level */
- __u16 s_def_resuid; /* Default uid for reserved blocks */
+/*050*/ __u16 s_def_resuid; /* Default uid for reserved blocks */
__u16 s_def_resgid; /* Default gid for reserved blocks */
/*
* These fields are for EXT2_DYNAMIC_REV superblocks only.
__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 */
+/*060*/ __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 */
+/*068*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
+/*078*/ __u8 s_volume_name[EXT2_LABEL_LEN]; /* volume name, no NUL? */
+/*088*/ __u8 s_last_mounted[64]; /* directory last mounted on, no NUL? */
+/*0c8*/ __u32 s_algorithm_usage_bitmap; /* For compression */
/*
* Performance hints. Directory preallocation should only
* happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
/*
* Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
*/
- __u8 s_journal_uuid[16]; /* uuid of journal superblock */
- __u32 s_journal_inum; /* inode number of journal file */
+/*0d0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
+/*0e0*/ __u32 s_journal_inum; /* inode number of journal file */
__u32 s_journal_dev; /* device number of journal file */
__u32 s_last_orphan; /* start of list of inodes to delete */
- __u32 s_hash_seed[4]; /* HTREE hash seed */
- __u8 s_def_hash_version; /* Default hash version to use */
- __u8 s_jnl_backup_type; /* Default type of journal backup */
+/*0ec*/ __u32 s_hash_seed[4]; /* HTREE hash seed */
+/*0fc*/ __u8 s_def_hash_version; /* Default hash version to use */
+ __u8 s_jnl_backup_type; /* Default type of journal backup */
__u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */
- __u32 s_default_mount_opts;
+/*100*/ __u32 s_default_mount_opts; /* default EXT2_MOUNT_* flags used */
__u32 s_first_meta_bg; /* First metablock group */
__u32 s_mkfs_time; /* When the filesystem was created */
- __u32 s_jnl_blocks[17]; /* Backup of the journal inode */
- __u32 s_blocks_count_hi; /* Blocks count high 32bits */
+/*10c*/ __u32 s_jnl_blocks[17]; /* Backup of the journal inode */
+/*150*/ __u32 s_blocks_count_hi; /* Blocks count high 32bits */
__u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/
- __u32 s_free_blocks_hi; /* Free blocks count */
+ __u32 s_free_blocks_hi; /* Free blocks count */
__u16 s_min_extra_isize; /* All inodes have at least # bytes */
- __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 */
- __u64 s_mmp_block; /* Block for multi-mount protection */
- __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
+ __u16 s_want_extra_isize; /* New inodes should reserve # bytes */
+/*160*/ __u32 s_flags; /* Miscellaneous flags */
+ __u16 s_raid_stride; /* RAID stride in blocks */
+ __u16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
+ __u64 s_mmp_block; /* Block for multi-mount protection */
+/*170*/ __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;
- __u16 s_reserved_pad; /* Padding to next 32bits */
+ __u8 s_checksum_type; /* metadata checksum algorithm */
+ __u8 s_encryption_level; /* versioning level for encryption */
+ __u8 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 */
+/*180*/ __u32 s_snapshot_inum; /* Inode number of active snapshot */
+ __u32 s_snapshot_id; /* sequential ID of active snapshot */
+ __u64 s_snapshot_r_blocks_count; /* active snapshot reserved blocks */
+/*190*/ __u32 s_snapshot_list; /* inode number of 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 */
+/*1a0*/ __u64 s_first_error_block; /* block involved in first error */
+ __u8 s_first_error_func[32]; /* function where error hit, no NUL? */
+/*1c8*/ __u32 s_first_error_line; /* line number where error happened */
+ __u32 s_last_error_time; /* most recent time of an error */
+/*1d0*/ __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 */
+/*1e0*/ __u8 s_last_error_func[32]; /* function where error hit, no NUL? */
+#define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts)
+/*200*/ __u8 s_mount_opts[64]; /* default mount options, no NUL? */
+/*240*/ __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_clusters; /* overhead blocks/clusters in fs */
+/*24c*/ __u32 s_backup_bgs[2]; /* If sparse_super2 enabled */
+/*254*/ __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
+/*258*/ __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
+/*268*/ __le32 s_lpf_ino; /* Location of the lost+found inode */
+ __le32 s_prj_quota_inum; /* inode for tracking project quota */
+/*270*/ __le32 s_checksum_seed; /* crc32c(orig_uuid) if csum_seed set */
+/*274*/ __u8 s_wtime_hi;
+ __u8 s_mtime_hi;
+ __u8 s_mkfs_time_hi;
+ __u8 s_lastcheck_hi;
+ __u8 s_first_error_time_hi;
+ __u8 s_last_error_time_hi;
+ __u8 s_first_error_errcode;
+ __u8 s_last_error_errcode;
+/*27c*/ __le16 s_encoding; /* Filename charset encoding */
+ __le16 s_encoding_flags; /* Filename charset encoding flags */
+ __le32 s_reserved[95]; /* Padding to the end of the block */
+/*3fc*/ __u32 s_checksum; /* crc32c(superblock) */
};
+#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
+#define EXT2_LEN_STR(buf) (int)sizeof(buf), (char *)buf
+
/*
* 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 EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
+#define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400
+#define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
+
#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 EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
+#define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 /* Project quota */
+#define EXT4_FEATURE_RO_COMPAT_SHARED_BLOCKS 0x4000
+#define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
-
+#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400
+#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000
+#define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
+#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
+#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
+#define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
+#define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
+
+#define EXT4_FEATURE_COMPAT_FUNCS(name, ver, flagname) \
+static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \
+{ \
+ return ((EXT2_SB(sb)->s_feature_compat & \
+ EXT##ver##_FEATURE_COMPAT_##flagname) != 0); \
+} \
+static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \
+{ \
+ EXT2_SB(sb)->s_feature_compat |= \
+ EXT##ver##_FEATURE_COMPAT_##flagname; \
+} \
+static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \
+{ \
+ EXT2_SB(sb)->s_feature_compat &= \
+ ~EXT##ver##_FEATURE_COMPAT_##flagname; \
+}
+
+#define EXT4_FEATURE_RO_COMPAT_FUNCS(name, ver, flagname) \
+static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \
+{ \
+ return ((EXT2_SB(sb)->s_feature_ro_compat & \
+ EXT##ver##_FEATURE_RO_COMPAT_##flagname) != 0); \
+} \
+static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \
+{ \
+ EXT2_SB(sb)->s_feature_ro_compat |= \
+ EXT##ver##_FEATURE_RO_COMPAT_##flagname; \
+} \
+static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \
+{ \
+ EXT2_SB(sb)->s_feature_ro_compat &= \
+ ~EXT##ver##_FEATURE_RO_COMPAT_##flagname; \
+}
+
+#define EXT4_FEATURE_INCOMPAT_FUNCS(name, ver, flagname) \
+static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \
+{ \
+ return ((EXT2_SB(sb)->s_feature_incompat & \
+ EXT##ver##_FEATURE_INCOMPAT_##flagname) != 0); \
+} \
+static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \
+{ \
+ EXT2_SB(sb)->s_feature_incompat |= \
+ EXT##ver##_FEATURE_INCOMPAT_##flagname; \
+} \
+static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \
+{ \
+ EXT2_SB(sb)->s_feature_incompat &= \
+ ~EXT##ver##_FEATURE_INCOMPAT_##flagname; \
+}
+
+EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, 2, DIR_PREALLOC)
+EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, 2, IMAGIC_INODES)
+EXT4_FEATURE_COMPAT_FUNCS(journal, 3, HAS_JOURNAL)
+EXT4_FEATURE_COMPAT_FUNCS(xattr, 2, EXT_ATTR)
+EXT4_FEATURE_COMPAT_FUNCS(resize_inode, 2, RESIZE_INODE)
+EXT4_FEATURE_COMPAT_FUNCS(dir_index, 2, DIR_INDEX)
+EXT4_FEATURE_COMPAT_FUNCS(lazy_bg, 2, LAZY_BG)
+EXT4_FEATURE_COMPAT_FUNCS(exclude_bitmap, 2, EXCLUDE_BITMAP)
+EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, 4, SPARSE_SUPER2)
+EXT4_FEATURE_COMPAT_FUNCS(fast_commit, 4, FAST_COMMIT)
+EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, 4, STABLE_INODES)
+
+EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, 2, SPARSE_SUPER)
+EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, 2, LARGE_FILE)
+EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, 4, HUGE_FILE)
+EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, 4, GDT_CSUM)
+EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, 4, DIR_NLINK)
+EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, 4, EXTRA_ISIZE)
+EXT4_FEATURE_RO_COMPAT_FUNCS(has_snapshot, 4, HAS_SNAPSHOT)
+EXT4_FEATURE_RO_COMPAT_FUNCS(quota, 4, QUOTA)
+EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, 4, BIGALLOC)
+EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, 4, METADATA_CSUM)
+EXT4_FEATURE_RO_COMPAT_FUNCS(replica, 4, REPLICA)
+EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, 4, READONLY)
+EXT4_FEATURE_RO_COMPAT_FUNCS(project, 4, PROJECT)
+EXT4_FEATURE_RO_COMPAT_FUNCS(shared_blocks, 4, SHARED_BLOCKS)
+EXT4_FEATURE_RO_COMPAT_FUNCS(verity, 4, VERITY)
+
+EXT4_FEATURE_INCOMPAT_FUNCS(compression, 2, COMPRESSION)
+EXT4_FEATURE_INCOMPAT_FUNCS(filetype, 2, FILETYPE)
+EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, 3, RECOVER)
+EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, 3, JOURNAL_DEV)
+EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, 2, META_BG)
+EXT4_FEATURE_INCOMPAT_FUNCS(extents, 3, EXTENTS)
+EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 4, 64BIT)
+EXT4_FEATURE_INCOMPAT_FUNCS(mmp, 4, MMP)
+EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, 4, FLEX_BG)
+EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, 4, EA_INODE)
+EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, 4, DIRDATA)
+EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, 4, CSUM_SEED)
+EXT4_FEATURE_INCOMPAT_FUNCS(largedir, 4, LARGEDIR)
+EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, 4, INLINE_DATA)
+EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, 4, ENCRYPT)
+EXT4_FEATURE_INCOMPAT_FUNCS(casefold, 4, CASEFOLD)
#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| \
+ EXT4_FEATURE_INCOMPAT_LARGEDIR| \
+ EXT4_FEATURE_INCOMPAT_EA_INODE| \
+ EXT4_FEATURE_INCOMPAT_DIRDATA)
#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \
- EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
+ EXT2_FEATURE_RO_COMPAT_BTREE_DIR| \
+ EXT4_FEATURE_RO_COMPAT_VERITY| \
+ EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)
/*
* Default values for user and/or group using reserved blocks
#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
+
+static inline int ext4_hash_in_dirent(const struct ext2_inode *inode)
+{
+ return (inode->i_flags & EXT4_ENCRYPT_FL) &&
+ (inode->i_flags & EXT4_CASEFOLD_FL);
+}
/*
* 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 endian 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 */
};
/*
+ * Hashes for ext4_dir_entry for casefolded and ecrypted directories.
+ * This is located at the first 4 bit aligned location after the name.
+ */
+
+struct ext2_dir_entry_hash {
+ __le32 hash;
+ __le32 minor_hash;
+};
+
+#define EXT2_DIRENT_HASHES(entry) \
+ ((struct ext2_dir_entry_hash *) &entry->name[\
+ (ext2fs_dirent_name_len(entry) + \
+ EXT2_DIR_ROUND) & ~EXT2_DIR_ROUND])
+#define EXT2_DIRENT_HASH(entry) \
+ ext2fs_le32_to_cpu(EXT2_DIRENT_HASHES(entry)->hash)
+#define EXT2_DIRENT_MINOR_HASH(entry) \
+ ext2fs_le32_to_cpu(EXT2_DIRENT_HASHES(entry)->minor_hash)
+
+/*
+ * 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_SYMLINK 7
#define EXT2_FT_MAX 8
+#define EXT2_FT_MASK 0x0f
+
+/*
+ * 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
+
+int ext2_get_dirdata_field_size(struct ext2_dir_entry *de, char dirdata_flags);
+int ext2_get_dirdata_size(struct ext2_dir_entry *de);
/*
* EXT2_DIR_PAD defines the directory entries boundaries
*
* NOTE: It must be a multiple of 4
*/
+#define EXT2_DIR_ENTRY_HEADER_LEN 8
+#define EXT2_DIR_ENTRY_HASH_LEN 8
#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) & \
+#define EXT2_DIR_NAME_LEN(name_len) (((name_len) + \
+ EXT2_DIR_ENTRY_HEADER_LEN + \
+ EXT2_DIR_ROUND) & \
~EXT2_DIR_ROUND)
+#define EXT2_DIR_REC_LEN(de) (EXT2_DIR_NAME_LEN(((de)->name_len & \
+ EXT2_NAME_LEN) + \
+ ext2_get_dirdata_size(de)))
+
+static inline unsigned int ext2fs_dir_rec_len(__u8 name_len,
+ int extended)
+{
+ int rec_len = (name_len + EXT2_DIR_ENTRY_HEADER_LEN + EXT2_DIR_ROUND);
+
+ rec_len &= ~EXT2_DIR_ROUND;
+ if (extended)
+ rec_len += EXT2_DIR_ENTRY_HASH_LEN;
+ return rec_len;
+}
+
+static inline unsigned int ext2fs_dirdata_rec_len(struct ext2_dir_entry *de,
+ int extended)
+{
+ int rec_len = EXT2_DIR_REC_LEN(de);
+
+ if (extended)
+ rec_len += EXT2_DIR_ENTRY_HASH_LEN;
+ return rec_len;
+}
+
+/* lu_fid size and NUL char */
+#define EXT2_DIRENT_LUFID_SIZE 16
+#define EXT2_DIRENT_LUFID 0x10
+
+/*
+ * Constants for ext4's extended time encoding
+ */
+#define EXT4_EPOCH_BITS 2
+#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
+#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
/*
- * 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
+ * arbitrary 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 */
+/* Not endian-annotated; it's swapped at read/write time */
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 (seconds) */
+ __u8 mmp_nodename[64]; /* Node updating MMP block, no NUL? */
+ __u8 mmp_bdevname[32]; /* Bdev updating MMP block, no NUL? */
+ __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 EXT2_MMP_DEF_INTERVAL 5
+#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 EXT4_MMP_MIN_CHECK_INTERVAL 5
+
+/*
+ * Minimum size of inline data.
+ */
+#define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__u32) * EXT2_N_BLOCKS))
+
+/*
+ * Size of a parent inode in inline data directory.
+ */
+#define EXT4_INLINE_DATA_DOTDOT_SIZE (4)
+
+#define EXT4_ENC_UTF8_12_1 1
+
+#define EXT4_ENC_STRICT_MODE_FL (1 << 0) /* Reject invalid sequences */
+
+#define EXT2_NEXT_DIRENT(d) ((void *)((char *)(d) + (d)->rec_len))
#endif /* _LINUX_EXT2_FS_H */
git://git.whamcloud.com / tools / e2fsprogs.git / blobdiff