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| author | Joel Becker <joel.becker@oracle.com> | 2008-02-01 12:06:54 -0800 |
|---|---|---|
| committer | Mark Fasheh <mfasheh@suse.com> | 2008-04-18 08:56:03 -0700 |
| commit | 386a2ef8576e966076c293f6496b9e3d7e3d9035 (patch) | |
| tree | 08b6cae47060497359a6ab78134a1bf8e38012cc /fs/ocfs2/ocfs2.h | |
| parent | fb86b1f07120b66769a39c445da5c4300069dd44 (diff) | |
| download | lwn-386a2ef8576e966076c293f6496b9e3d7e3d9035.tar.gz lwn-386a2ef8576e966076c293f6496b9e3d7e3d9035.zip | |
ocfs2: New slot map format
The old slot map had a few limitations:
- It was limited to one block, so the maximum slot count was 255.
- Each slot was signed 16bits, limiting node numbers to INT16_MAX.
- An empty slot was marked by the magic 0xFFFF (-1).
The new slot map format provides 32bit node numbers (UINT32_MAX), a
separate space to mark a slot in use, and extra room to grow. The slot
map is now bounded by i_size, not a block.
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 | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h index 95f783dbe8b2..f78e9ed53249 100644 --- a/fs/ocfs2/ocfs2.h +++ b/fs/ocfs2/ocfs2.h @@ -374,6 +374,13 @@ static inline int ocfs2_mount_local(struct ocfs2_super *osb) return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT); } +static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb) +{ + return (osb->s_feature_incompat & + OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP); +} + + #define OCFS2_IS_VALID_DINODE(ptr) \ (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE)) |