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authorJoel Becker <joel.becker@oracle.com>2008-02-01 12:06:54 -0800
committerMark Fasheh <mfasheh@suse.com>2008-04-18 08:56:03 -0700
commit386a2ef8576e966076c293f6496b9e3d7e3d9035 (patch)
tree08b6cae47060497359a6ab78134a1bf8e38012cc /fs/ocfs2/ocfs2.h
parentfb86b1f07120b66769a39c445da5c4300069dd44 (diff)
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.h7
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))