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Subject[PATCH 07/28] ext4: Create a rocompat flag for extended metadata checksumming
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This patch introduces a rocompat feature flag to signal the presence of
checksums for metadata blocks. It also provides storage for a precomputed UUID
checksum.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
---
fs/ext4/ext4.h | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)


diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index b7d7bd0..8ee8646 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1222,6 +1222,9 @@ struct ext4_sb_info {

/* record the last minlen when FITRIM is called. */
atomic_t s_last_trim_minblks;
+
+ /* Precomputed FS UUID checksum */
+ __u32 s_uuid_crc;
};

static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
@@ -1360,6 +1363,7 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
+#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400

#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
@@ -1402,7 +1406,8 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
- EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
+ EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)

/*
* Default values for user and/or group using reserved blocks


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