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authorSteven Whitehouse <swhiteho@redhat.com>2011-06-15 10:29:37 +0100
committerSteven Whitehouse <swhiteho@redhat.com>2011-07-15 09:31:48 +0100
commit17d539f0499fa2c0321b7c260831cca2bb36d119 (patch)
tree28b960ad670a0112d45afbab120f855b8e95b146 /fs/gfs2/incore.h
parent5dcd07b9f39ca3e9be5bcc387d193fc0674e1c81 (diff)
downloadlinux-17d539f0499fa2c0321b7c260831cca2bb36d119.tar.bz2
GFS2: Cache dir hash table in a contiguous buffer
This patch adds a cache for the hash table to the directory code in order to help simplify the way in which the hash table is accessed. This is intended to be a first step towards introducing some performance improvements in the directory code. There are two follow ups that I'm hoping to see fairly shortly. One is to simplify the hash table reading code now that we always read the complete hash table, whether we want one entry or all of them. The other is to introduce readahead on the heads of the hash chains which are referred to from the table. The hash table is a maximum of 128k in size, so it is not worth trying to read it in small chunks. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/incore.h')
-rw-r--r--fs/gfs2/incore.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 81206e70cbf6..24cd55f60e60 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -285,6 +285,7 @@ struct gfs2_inode {
u64 i_goal; /* goal block for allocations */
struct rw_semaphore i_rw_mutex;
struct list_head i_trunc_list;
+ __be64 *i_hash_cache;
u32 i_entries;
u32 i_diskflags;
u8 i_height;