[GFS2] Allocate gfs2_rgrpd from slab memory

This patch moves the gfs2_rgrpd structure to its own slab
memory.  This makes it easier to control and monitor, and
yields less memory fragmentation.

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

4 files changed, 14 insertions, 2 deletions

diff --git a/fs/gfs2/main.c b/fs/gfs2/main.c
index 9c7765c12d62..053e2ebbbd50 100644
--- a/fs/gfs2/main.c
+++ b/fs/gfs2/main.c
@@ -89,6 +89,12 @@ static int __init init_gfs2_fs(void)
         if (!gfs2_bufdata_cachep)
                 goto fail;
 
+        gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
+                                              sizeof(struct gfs2_rgrpd),
+                                              0, 0, NULL);
+        if (!gfs2_rgrpd_cachep)
+                goto fail;
+
         error = register_filesystem(&gfs2_fs_type);
         if (error)
                 goto fail;
@@ -108,6 +114,9 @@ fail_unregister:
 fail:
         gfs2_glock_exit();
 
+        if (gfs2_rgrpd_cachep)
+                kmem_cache_destroy(gfs2_rgrpd_cachep);
+
         if (gfs2_bufdata_cachep)
                 kmem_cache_destroy(gfs2_bufdata_cachep);
 
@@ -133,6 +142,7 @@ static void __exit exit_gfs2_fs(void)
         unregister_filesystem(&gfs2_fs_type);
         unregister_filesystem(&gfs2meta_fs_type);
 
+        kmem_cache_destroy(gfs2_rgrpd_cachep);
         kmem_cache_destroy(gfs2_bufdata_cachep);
         kmem_cache_destroy(gfs2_inode_cachep);
         kmem_cache_destroy(gfs2_glock_cachep);
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 7b9d6f1d1527..dc7e83eed32d 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -353,7 +353,7 @@ static void clear_rgrpdi(struct gfs2_sbd *sdp)
                 }
 
                 kfree(rgd->rd_bits);
-                kfree(rgd);
+                kmem_cache_free(gfs2_rgrpd_cachep, rgd);
         }
 }
 
@@ -516,7 +516,7 @@ static int read_rindex_entry(struct gfs2_inode *ip,
                 return error;
         }
 
-        rgd = kzalloc(sizeof(struct gfs2_rgrpd), GFP_NOFS);
+        rgd = kmem_cache_zalloc(gfs2_rgrpd_cachep, GFP_NOFS);
         error = -ENOMEM;
         if (!rgd)
                 return error;
diff --git a/fs/gfs2/util.c b/fs/gfs2/util.c
index 424a0774eda8..fe9c28ef77b0 100644
--- a/fs/gfs2/util.c
+++ b/fs/gfs2/util.c
@@ -25,6 +25,7 @@
 struct kmem_cache *gfs2_glock_cachep __read_mostly;
 struct kmem_cache *gfs2_inode_cachep __read_mostly;
 struct kmem_cache *gfs2_bufdata_cachep __read_mostly;
+struct kmem_cache *gfs2_rgrpd_cachep __read_mostly;
 
 void gfs2_assert_i(struct gfs2_sbd *sdp)
 {
diff --git a/fs/gfs2/util.h b/fs/gfs2/util.h
index 28938a46cf47..ac0c567ebc36 100644
--- a/fs/gfs2/util.h
+++ b/fs/gfs2/util.h
@@ -147,6 +147,7 @@ gfs2_io_error_bh_i((sdp), (bh), __FUNCTION__, __FILE__, __LINE__);
 extern struct kmem_cache *gfs2_glock_cachep;
 extern struct kmem_cache *gfs2_inode_cachep;
 extern struct kmem_cache *gfs2_bufdata_cachep;
+extern struct kmem_cache *gfs2_rgrpd_cachep;
 
 static inline unsigned int gfs2_tune_get_i(struct gfs2_tune *gt,
                                            unsigned int *p)