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authorSteven Whitehouse <swhiteho@redhat.com>2011-06-15 13:29:37 +0400
committerSteven Whitehouse <swhiteho@redhat.com>2011-07-15 12:31:48 +0400
commit17d539f0499fa2c0321b7c260831cca2bb36d119 (patch)
tree28b960ad670a0112d45afbab120f855b8e95b146 /fs/gfs2/dir.h
parent5dcd07b9f39ca3e9be5bcc387d193fc0674e1c81 (diff)
downloadlinux-17d539f0499fa2c0321b7c260831cca2bb36d119.tar.xz
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/dir.h')
-rw-r--r--fs/gfs2/dir.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/gfs2/dir.h b/fs/gfs2/dir.h
index e686af11becd..ff5772fbf024 100644
--- a/fs/gfs2/dir.h
+++ b/fs/gfs2/dir.h
@@ -35,6 +35,7 @@ extern int gfs2_diradd_alloc_required(struct inode *dir,
const struct qstr *filename);
extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
struct buffer_head **bhp);
+extern void gfs2_dir_hash_inval(struct gfs2_inode *ip);
static inline u32 gfs2_disk_hash(const char *data, int len)
{