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| author | Mark Fasheh <mfasheh@suse.com> | 2008-12-10 17:36:25 -0800 |
|---|---|---|
| committer | Mark Fasheh <mfasheh@suse.com> | 2009-01-05 08:40:34 -0800 |
| commit | 87d35a74b15ec703910a63e0667692fb5e267be0 (patch) | |
| tree | 39f18bcf38b855fa7ec806803567532f214129f0 /fs/ocfs2/ocfs2.h | |
| parent | 84008972491ca91b240f106191519781dabb8016 (diff) | |
| download | lwn-87d35a74b15ec703910a63e0667692fb5e267be0.tar.gz lwn-87d35a74b15ec703910a63e0667692fb5e267be0.zip | |
ocfs2: Add directory block trailers.
Future ocfs2 features metaecc and indexed directories need to store a
little bit of data in each dirblock. For compatibility, we place this
in a trailer at the end of the dirblock. The trailer plays itself as an
empty dirent, so that if the features are turned off, it can be reused
without requiring a tunefs scan.
This code adds the trailer and validates it when the block is read in.
[ Mark is the original author, but I reinserted this code before his
dir index work. -- Joel ]
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Diffstat (limited to 'fs/ocfs2/ocfs2.h')
| -rw-r--r-- | fs/ocfs2/ocfs2.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h index bad87d0a03c9..ad5c24a29edd 100644 --- a/fs/ocfs2/ocfs2.h +++ b/fs/ocfs2/ocfs2.h @@ -470,6 +470,9 @@ static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb) #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \ (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE)) +#define OCFS2_IS_VALID_DIR_TRAILER(ptr) \ + (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE)) + static inline unsigned long ino_from_blkno(struct super_block *sb, u64 blkno) { |