[PATCH 02/22] ext4: Create a rocompat flag for extended metadata checksumming
STALE5407d
From: Darrick J. Wong <hidden>
Date: 2011-11-28 23:26:29
Also in:
linux-fsdevel, lkml
Subsystem:
ext4 file system, filesystems (vfs and infrastructure), the rest · Maintainers:
"Theodore Ts'o", Alexander Viro, Christian Brauner, Linus Torvalds
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 <redacted> --- 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