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author | Mark Fasheh <mark.fasheh@oracle.com> | 2006-09-23 00:28:19 (GMT) |
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committer | Mark Fasheh <mark.fasheh@oracle.com> | 2006-09-24 20:50:46 (GMT) |
commit | 24c19ef40474c3930597f31ae233dc06319bd881 (patch) | |
tree | e05b1cf72435d25bf47e67b206aa376bbea33b7d /fs/ocfs2/cluster | |
parent | f9e2d82e6395cfa0802446b54b63cc412089d82c (diff) | |
download | linux-fsl-qoriq-24c19ef40474c3930597f31ae233dc06319bd881.tar.xz |
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/cluster')
-rw-r--r-- | fs/ocfs2/cluster/tcp_internal.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/ocfs2/cluster/tcp_internal.h b/fs/ocfs2/cluster/tcp_internal.h index da42b51..4b46aac 100644 --- a/fs/ocfs2/cluster/tcp_internal.h +++ b/fs/ocfs2/cluster/tcp_internal.h @@ -44,6 +44,9 @@ * locking semantics of the file system using the protocol. It should * be somewhere else, I'm sure, but right now it isn't. * + * New in version 4: + * - Remove i_generation from lock names for better stat performance. + * * New in version 3: * - Replace dentry votes with a cluster lock * @@ -51,7 +54,7 @@ * - full 64 bit i_size in the metadata lock lvbs * - introduction of "rw" lock and pushing meta/data locking down */ -#define O2NET_PROTOCOL_VERSION 3ULL +#define O2NET_PROTOCOL_VERSION 4ULL struct o2net_handshake { __be64 protocol_version; __be64 connector_id; |