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authorMark Fasheh <mark.fasheh@oracle.com>2006-09-22 17:28:19 -0700
committerMark Fasheh <mark.fasheh@oracle.com>2006-09-24 13:50:46 -0700
commit24c19ef40474c3930597f31ae233dc06319bd881 (patch)
treee05b1cf72435d25bf47e67b206aa376bbea33b7d /fs/ocfs2/inode.h
parentf9e2d82e6395cfa0802446b54b63cc412089d82c (diff)
ocfs2: Remove i_generation from inode lock names
OCFS2 puts inode meta data in the "lock value block" provided by the DLM. Typically, i_generation is encoded in the lock name so that a deleted inode on and a new one in the same block don't share the same lvb. Unfortunately, that scheme means that the read in ocfs2_read_locked_inode() is potentially thrown away as soon as the meta data lock is taken - we cannot encode the lock name without first knowing i_generation, which requires a disk read. This patch encodes i_generation in the inode meta data lvb, and removes the value from the inode meta data lock name. This way, the read can be covered by a lock, and at the same time we can distinguish between an up to date and a stale LVB. This will help cold-cache stat(2) performance in particular. Since this patch changes the protocol version, we take the opportunity to do a minor re-organization of two of the LVB fields. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Diffstat (limited to 'fs/ocfs2/inode.h')
-rw-r--r--fs/ocfs2/inode.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/ocfs2/inode.h b/fs/ocfs2/inode.h
index 4d1e5399256..9957810fdf8 100644
--- a/fs/ocfs2/inode.h
+++ b/fs/ocfs2/inode.h
@@ -122,7 +122,13 @@ struct buffer_head *ocfs2_bread(struct inode *inode, int block,
void ocfs2_clear_inode(struct inode *inode);
void ocfs2_delete_inode(struct inode *inode);
void ocfs2_drop_inode(struct inode *inode);
-struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 feoff);
+
+/* Flags for ocfs2_iget() */
+#define OCFS2_FI_FLAG_NOWAIT 0x1
+#define OCFS2_FI_FLAG_DELETE 0x2
+#define OCFS2_FI_FLAG_SYSFILE 0x4
+#define OCFS2_FI_FLAG_NOLOCK 0x8
+struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 feoff, int flags);
struct inode *ocfs2_ilookup_for_vote(struct ocfs2_super *osb,
u64 blkno,
int delete_vote);