Define flags and change journal structure definitions to support v2 journal
checksumming.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
lib/ext2fs/kernel-jbd.h | 30 +++++++++++++++++++++++++++---
1 files changed, 27 insertions(+), 3 deletions(-)
diff --git a/lib/ext2fs/kernel-jbd.h b/lib/ext2fs/kernel-jbd.h
index 066c031..570bfa6 100644
--- a/lib/ext2fs/kernel-jbd.h
+++ b/lib/ext2fs/kernel-jbd.h
@@ -114,12 +114,24 @@ typedef struct journal_header_s
#define JBD2_CRC32_CHKSUM 1
#define JBD2_MD5_CHKSUM 2
#define JBD2_SHA1_CHKSUM 3
+#define JBD2_CRC32C_CHKSUM 4
#define JBD2_CRC32_CHKSUM_SIZE 4
#define JBD2_CHECKSUM_BYTES (32 / sizeof(__u32))
/*
* Commit block header for storing transactional checksums:
+ *
+ * NOTE: If FEATURE_COMPAT_CHECKSUM (checksum v1) is set, the h_chksum*
+ * fields are used to store a checksum of the descriptor and data blocks.
+ *
+ * If FEATURE_INCOMPAT_CSUM_V2 (checksum v2) is set, then the h_chksum
+ * field is used to store crc32c(uuid+commit_block). Each journal metadata
+ * block gets its own checksum, and data block checksums are stored in
+ * journal_block_tag (in the descriptor). The other h_chksum* fields are
+ * not used.
+ *
+ * Checksum v1 and v2 are mutually exclusive features.
*/
struct commit_header {
__u32 h_magic;
@@ -141,11 +153,17 @@ typedef struct journal_block_tag_s
__u32 t_blocknr; /* The on-disk block number */
__u32 t_flags; /* See below */
__u32 t_blocknr_high; /* most-significant high 32bits. */
+ __u32 t_checksum; /* crc32c(uuid+seq+block) */
} journal_block_tag_t;
#define JBD_TAG_SIZE64 (sizeof(journal_block_tag_t))
#define JBD_TAG_SIZE32 (8)
+/* Tail of descriptor block, for checksumming */
+struct journal_block_tail {
+ __u32 t_checksum;
+};
+
/*
* The revoke descriptor: used on disk to describe a series of blocks to
* be revoked from the log
@@ -156,6 +174,10 @@ typedef struct journal_revoke_header_s
int r_count; /* Count of bytes used in the block */
} journal_revoke_header_t;
+/* Tail of revoke block, for checksumming */
+struct journal_revoke_tail {
+ __u32 r_checksum;
+};
/* Definitions for the journal tag flags word: */
#define JFS_FLAG_ESCAPE 1 /* on-disk block is escaped */
@@ -205,7 +227,10 @@ typedef struct journal_superblock_s
__u32 s_max_trans_data; /* Limit of data blocks per trans. */
/* 0x0050 */
- __u32 s_padding[44];
+ __u8 s_checksum_type; /* checksum type */
+ __u8 s_padding2[3];
+ __u32 s_padding[42];
+ __u32 s_checksum; /* crc32c(superblock) */
/* 0x0100 */
__u8 s_users[16*48]; /* ids of all fs'es sharing the log */
@@ -224,11 +249,10 @@ typedef struct journal_superblock_s
#define JFS_FEATURE_COMPAT_CHECKSUM 0x00000001
-#define JFS_FEATURE_INCOMPAT_REVOKE 0x00000001
-
#define JFS_FEATURE_INCOMPAT_REVOKE 0x00000001
#define JFS_FEATURE_INCOMPAT_64BIT 0x00000002
#define JFS_FEATURE_INCOMPAT_ASYNC_COMMIT 0x00000004
+#define JFS_FEATURE_INCOMPAT_CSUM_V2 0x00000008
/* Features known to this kernel version: */
#define JFS_KNOWN_COMPAT_FEATURES 0
--
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