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@xxxxxxxxxx>
---
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 5b0e26a..414c2f8 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1249,6 +1249,9 @@ 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_csum;
};
static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
@@ -1397,6 +1400,7 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
+#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
@@ -1440,7 +1444,8 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
- EXT4_FEATURE_RO_COMPAT_BIGALLOC)
+ EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)
/*
* Default values for user and/or group using reserved blocks
--
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