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authorDarrick J. Wong <djwong@us.ibm.com>2012-04-29 18:23:10 -0400
committerTheodore Ts'o <tytso@mit.edu>2012-04-29 18:23:10 -0400
commite615391896064eb5a0c760d086b8e1c6ecfffeab (patch)
tree1d05a5e925579bc444468d88eacca00d633b8286 /fs/ext4/xattr.h
parentf84891289e62a74e9b4942eaad80617368b2d778 (diff)
downloadblackbird-op-linux-e615391896064eb5a0c760d086b8e1c6ecfffeab.tar.gz
blackbird-op-linux-e615391896064eb5a0c760d086b8e1c6ecfffeab.zip
ext4: change on-disk layout to support extended metadata checksumming
Define flags and change structure definitions to allow checksumming of ext4 metadata. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/xattr.h')
-rw-r--r--fs/ext4/xattr.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
index 25b7387ff183..91f31ca7d9af 100644
--- a/fs/ext4/xattr.h
+++ b/fs/ext4/xattr.h
@@ -27,7 +27,9 @@ struct ext4_xattr_header {
__le32 h_refcount; /* reference count */
__le32 h_blocks; /* number of disk blocks used */
__le32 h_hash; /* hash value of all attributes */
- __u32 h_reserved[4]; /* zero right now */
+ __le32 h_checksum; /* crc32c(uuid+id+xattrblock) */
+ /* id = inum if refcount=1, blknum otherwise */
+ __u32 h_reserved[3]; /* zero right now */
};
struct ext4_xattr_ibody_header {
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