2 files changed, 34 insertions, 5 deletions

diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h
index 300cc5a5adb9..cd406dba0e64 100644
--- a/include/linux/ext4_fs.h
+++ b/include/linux/ext4_fs.h
@@ -467,7 +467,8 @@ do {									       \
 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
 #define EXT4_MOUNT_EXTENTS              0x400000 /* Extents support */
-
+#define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
+#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
 #ifndef _LINUX_EXT2_FS_H
 #define clear_opt(o, opt)               o &= ~EXT4_MOUNT_##opt
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index 685640036e81..98a2bc5d3e3f 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -149,6 +149,28 @@ typedef struct journal_header_s
         __be32          h_sequence;
 } journal_header_t;
 
+/*
+ * Checksum types.
+ */
+#define JBD2_CRC32_CHKSUM   1
+#define JBD2_MD5_CHKSUM     2
+#define JBD2_SHA1_CHKSUM    3
+
+#define JBD2_CRC32_CHKSUM_SIZE 4
+
+#define JBD2_CHECKSUM_BYTES (32 / sizeof(u32))
+/*
+ * Commit block header for storing transactional checksums:
+ */
+struct commit_header {
+        __be32          h_magic;
+        __be32          h_blocktype;
+        __be32          h_sequence;
+        unsigned char   h_chksum_type;
+        unsigned char   h_chksum_size;
+        unsigned char   h_padding[2];
+        __be32          h_chksum[JBD2_CHECKSUM_BYTES];
+};
 
 /*
  * The block tag: used to describe a single buffer in the journal.
@@ -242,14 +264,18 @@ typedef struct journal_superblock_s
         ((j)->j_format_version >= 2 &&                                  \
          ((j)->j_superblock->s_feature_incompat & cpu_to_be32((mask))))
 
-#define JBD2_FEATURE_INCOMPAT_REVOKE    0x00000001
-#define JBD2_FEATURE_INCOMPAT_64BIT     0x00000002
+#define JBD2_FEATURE_COMPAT_CHECKSUM    0x00000001
+
+#define JBD2_FEATURE_INCOMPAT_REVOKE            0x00000001
+#define JBD2_FEATURE_INCOMPAT_64BIT             0x00000002
+#define JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT      0x00000004
 
 /* Features known to this kernel version: */
-#define JBD2_KNOWN_COMPAT_FEATURES      0
+#define JBD2_KNOWN_COMPAT_FEATURES      JBD2_FEATURE_COMPAT_CHECKSUM
 #define JBD2_KNOWN_ROCOMPAT_FEATURES    0
 #define JBD2_KNOWN_INCOMPAT_FEATURES    (JBD2_FEATURE_INCOMPAT_REVOKE | \
-                                         JBD2_FEATURE_INCOMPAT_64BIT)
+                                        JBD2_FEATURE_INCOMPAT_64BIT | \
+                                        JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)
 
 #ifdef __KERNEL__
 
@@ -997,6 +1023,8 @@ extern int	   jbd2_journal_check_available_features
                    (journal_t *, unsigned long, unsigned long, unsigned long);
 extern int         jbd2_journal_set_features
                    (journal_t *, unsigned long, unsigned long, unsigned long);
+extern void        jbd2_journal_clear_features
+                   (journal_t *, unsigned long, unsigned long, unsigned long);
 extern int         jbd2_journal_create     (journal_t *);
 extern int         jbd2_journal_load       (journal_t *journal);
 extern void        jbd2_journal_destroy    (journal_t *);