[GFS2] Replace rgrp "recent list" with mru list

This patch removes the "recent list" which is used during allocation
and replaces it with the (already existing) mru list used during
deletion. The "recent list" was not a true mru list leading to a number
of inefficiencies including a "next" function which made scanning the
list an order N^2 operation wrt to the number of list elements.

This should increase allocation performance with large numbers of rgrps.
Its also a useful preparation and cleanup before some further changes
which are planned in this area.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 4b734c6e34f0..4ab3c3a4a96f 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -77,7 +77,6 @@ struct gfs2_rgrp_host {
 struct gfs2_rgrpd {
         struct list_head rd_list;       /* Link with superblock */
         struct list_head rd_list_mru;
-        struct list_head rd_recent;     /* Recently used rgrps */
         struct gfs2_glock *rd_gl;       /* Glock for this rgrp */
         u64 rd_addr;                    /* grp block disk address */
         u64 rd_data0;                   /* first data location */
@@ -529,7 +528,6 @@ struct gfs2_sbd {
         struct mutex sd_rindex_mutex;
         struct list_head sd_rindex_list;
         struct list_head sd_rindex_mru_list;
-        struct list_head sd_rindex_recent_list;
         struct gfs2_rgrpd *sd_rindex_forward;
         unsigned int sd_rgrps;