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| author | Mark Fasheh <mark.fasheh@oracle.com> | 2006-09-22 17:28:19 -0700 |
|---|---|---|
| committer | Mark Fasheh <mark.fasheh@oracle.com> | 2006-09-24 13:50:46 -0700 |
| commit | 24c19ef40474c3930597f31ae233dc06319bd881 (patch) | |
| tree | e05b1cf72435d25bf47e67b206aa376bbea33b7d /fs/ocfs2/dlmglue.h | |
| parent | f9e2d82e6395cfa0802446b54b63cc412089d82c (diff) | |
| download | linux-24c19ef40474c3930597f31ae233dc06319bd881.tar.gz linux-24c19ef40474c3930597f31ae233dc06319bd881.tar.bz2 linux-24c19ef40474c3930597f31ae233dc06319bd881.zip | |
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/dlmglue.h')
| -rw-r--r-- | fs/ocfs2/dlmglue.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h index 45a74f44b688..4a2769387229 100644 --- a/fs/ocfs2/dlmglue.h +++ b/fs/ocfs2/dlmglue.h @@ -32,9 +32,9 @@ #define OCFS2_LVB_VERSION 4 struct ocfs2_meta_lvb { - __be16 lvb_reserved0; - __u8 lvb_reserved1; __u8 lvb_version; + __u8 lvb_reserved0; + __be16 lvb_reserved1; __be32 lvb_iclusters; __be32 lvb_iuid; __be32 lvb_igid; @@ -62,13 +62,14 @@ void ocfs2_dlm_shutdown(struct ocfs2_super *osb); void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res); void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, enum ocfs2_lock_type type, + unsigned int generation, struct inode *inode); void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl, u64 parent, struct inode *inode); void ocfs2_lock_res_free(struct ocfs2_lock_res *res); int ocfs2_create_new_inode_locks(struct inode *inode); int ocfs2_create_new_lock(struct ocfs2_super *osb, - struct ocfs2_lock_res *lockres, int ex); + struct ocfs2_lock_res *lockres, int ex, int local); int ocfs2_drop_inode_locks(struct inode *inode); int ocfs2_data_lock_full(struct inode *inode, int write, |