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Subject[PATCH 05/16] 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 pulls in CRC32c since we'll be
using that for the new checksums.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
---
fs/ext4/Kconfig | 1 +
fs/ext4/ext4.h | 4 +++-
2 files changed, 4 insertions(+), 1 deletions(-)


diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig
index 9ed1bb1..97f4a7d 100644
--- a/fs/ext4/Kconfig
+++ b/fs/ext4/Kconfig
@@ -2,6 +2,7 @@ config EXT4_FS
tristate "The Extended 4 (ext4) filesystem"
select JBD2
select CRC16
+ select LIBCRC32C
help
This is the next generation of the ext3 filesystem.

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index ecb86c2..f79ddac 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1359,6 +1359,7 @@ 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
@@ -1401,7 +1402,8 @@ 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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