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author | Mark Fasheh <mark.fasheh@oracle.com> | 2006-09-22 17:28:19 -0700 |
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committer | Mark Fasheh <mark.fasheh@oracle.com> | 2006-09-24 13:50:46 -0700 |
commit | 24c19ef40474c3930597f31ae233dc06319bd881 (patch) | |
tree | e05b1cf72435d25bf47e67b206aa376bbea33b7d /fs/ocfs2/inode.h | |
parent | f9e2d82e6395cfa0802446b54b63cc412089d82c (diff) | |
download | kernel_samsung_tuna-24c19ef40474c3930597f31ae233dc06319bd881.zip kernel_samsung_tuna-24c19ef40474c3930597f31ae233dc06319bd881.tar.gz kernel_samsung_tuna-24c19ef40474c3930597f31ae233dc06319bd881.tar.bz2 |
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.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/ocfs2/inode.h b/fs/ocfs2/inode.h index 4d1e539..9957810 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); |