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author | Mark Fasheh <mark.fasheh@oracle.com> | 2006-09-22 20:28:19 -0400 |
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committer | Mark Fasheh <mark.fasheh@oracle.com> | 2006-09-24 16:50:46 -0400 |
commit | 24c19ef40474c3930597f31ae233dc06319bd881 (patch) | |
tree | e05b1cf72435d25bf47e67b206aa376bbea33b7d /mm/sparse.c | |
parent | f9e2d82e6395cfa0802446b54b63cc412089d82c (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 'mm/sparse.c')
0 files changed, 0 insertions, 0 deletions