ext4: change on-disk layout to support extended metadata checksumming
Define flags and change structure definitions to allow checksumming of ext4 metadata. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Darrick J. Wong
Theodore Ts'o
parent
f84891289e
commit
e615391896
4 changed files with 63 additions and 9 deletions
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@ -298,7 +298,9 @@ struct ext4_group_desc
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__le16 bg_free_inodes_count_lo;/* Free inodes count */
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__le16 bg_used_dirs_count_lo; /* Directories count */
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__le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
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__u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
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__le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
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__le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
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__le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
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__le16 bg_itable_unused_lo; /* Unused inodes count */
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__le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
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__le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
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@ -308,7 +310,10 @@ struct ext4_group_desc
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__le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
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__le16 bg_used_dirs_count_hi; /* Directories count MSB */
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__le16 bg_itable_unused_hi; /* Unused inodes count MSB */
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__u32 bg_reserved2[3];
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__le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
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__le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
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__le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
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__u32 bg_reserved;
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};
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/*
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@ -650,7 +655,8 @@ struct ext4_inode {
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__le16 l_i_file_acl_high;
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__le16 l_i_uid_high; /* these 2 fields */
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__le16 l_i_gid_high; /* were reserved2[0] */
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__u32 l_i_reserved2;
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__le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
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__le16 l_i_reserved;
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} linux2;
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struct {
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__le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
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@ -666,7 +672,7 @@ struct ext4_inode {
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} masix2;
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} osd2; /* OS dependent 2 */
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__le16 i_extra_isize;
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__le16 i_pad1;
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__le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
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__le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
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__le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
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__le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
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@ -768,7 +774,7 @@ do { \
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#define i_gid_low i_gid
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#define i_uid_high osd2.linux2.l_i_uid_high
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#define i_gid_high osd2.linux2.l_i_gid_high
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#define i_reserved2 osd2.linux2.l_i_reserved2
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#define i_checksum_lo osd2.linux2.l_i_checksum_lo
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#elif defined(__GNU__)
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@ -1001,6 +1007,9 @@ extern void ext4_set_bits(void *bm, int cur, int len);
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#define EXT4_ERRORS_PANIC 3 /* Panic */
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#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
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/* Metadata checksum algorithm codes */
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#define EXT4_CRC32C_CHKSUM 1
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/*
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* Structure of the super block
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*/
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@ -1087,7 +1096,7 @@ struct ext4_super_block {
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__le64 s_mmp_block; /* Block for multi-mount protection */
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__le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
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__u8 s_log_groups_per_flex; /* FLEX_BG group size */
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__u8 s_reserved_char_pad;
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__u8 s_checksum_type; /* metadata checksum algorithm used */
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__le16 s_reserved_pad;
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__le64 s_kbytes_written; /* nr of lifetime kilobytes written */
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__le32 s_snapshot_inum; /* Inode number of active snapshot */
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@ -1113,7 +1122,8 @@ struct ext4_super_block {
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__le32 s_usr_quota_inum; /* inode for tracking user quota */
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__le32 s_grp_quota_inum; /* inode for tracking group quota */
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__le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
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__le32 s_reserved[109]; /* Padding to the end of the block */
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__le32 s_reserved[108]; /* Padding to the end of the block */
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__le32 s_checksum; /* crc32c(superblock) */
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};
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#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
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@ -1414,6 +1424,12 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
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#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
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#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
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#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
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/*
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* METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
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* METADATA_CSUM is set, group descriptor checksums use the same algorithm as
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* all other data structures' checksums. However, the METADATA_CSUM and
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* GDT_CSUM bits are mutually exclusive.
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*/
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#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
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#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
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@ -1526,6 +1542,18 @@ struct ext4_dir_entry_2 {
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char name[EXT4_NAME_LEN]; /* File name */
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};
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/*
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* This is a bogus directory entry at the end of each leaf block that
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* records checksums.
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*/
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struct ext4_dir_entry_tail {
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__le32 det_reserved_zero1; /* Pretend to be unused */
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__le16 det_rec_len; /* 12 */
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__u8 det_reserved_zero2; /* Zero name length */
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__u8 det_reserved_ft; /* 0xDE, fake file type */
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__le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
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};
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/*
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* Ext4 directory file types. Only the low 3 bits are used. The
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* other bits are reserved for now.
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@ -1541,6 +1569,8 @@ struct ext4_dir_entry_2 {
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#define EXT4_FT_MAX 8
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#define EXT4_FT_DIR_CSUM 0xDE
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/*
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* EXT4_DIR_PAD defines the directory entries boundaries
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*
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@ -1741,7 +1771,8 @@ struct mmp_struct {
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__le16 mmp_check_interval;
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__le16 mmp_pad1;
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__le32 mmp_pad2[227];
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__le32 mmp_pad2[226];
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__le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
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};
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/* arguments passed to the mmp thread */
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@ -63,8 +63,21 @@
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* ext4_inode has i_block array (60 bytes total).
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* The first 12 bytes store ext4_extent_header;
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* the remainder stores an array of ext4_extent.
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* For non-inode extent blocks, ext4_extent_tail
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* follows the array.
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*/
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/*
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* This is the extent tail on-disk structure.
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* All other extent structures are 12 bytes long. It turns out that
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* block_size % 12 >= 4 for at least all powers of 2 greater than 512, which
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* covers all valid ext4 block sizes. Therefore, this tail structure can be
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* crammed into the end of the block without having to rebalance the tree.
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*/
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struct ext4_extent_tail {
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__le32 et_checksum; /* crc32c(uuid+inum+extent_block) */
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};
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/*
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* This is the extent on-disk structure.
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* It's used at the bottom of the tree.
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@ -145,6 +145,14 @@ struct dx_map_entry
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u16 size;
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};
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/*
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* This goes at the end of each htree block.
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*/
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struct dx_tail {
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u32 dt_reserved;
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__le32 dt_checksum; /* crc32c(uuid+inum+dirblock) */
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};
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static inline ext4_lblk_t dx_get_block(struct dx_entry *entry);
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static void dx_set_block(struct dx_entry *entry, ext4_lblk_t value);
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static inline unsigned dx_get_hash(struct dx_entry *entry);
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@ -27,7 +27,9 @@ struct ext4_xattr_header {
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__le32 h_refcount; /* reference count */
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__le32 h_blocks; /* number of disk blocks used */
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__le32 h_hash; /* hash value of all attributes */
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__u32 h_reserved[4]; /* zero right now */
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__le32 h_checksum; /* crc32c(uuid+id+xattrblock) */
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/* id = inum if refcount=1, blknum otherwise */
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__u32 h_reserved[3]; /* zero right now */
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};
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struct ext4_xattr_ibody_header {
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