gfs2: Fix wrong error handling in init_gfs2_fs()

init_gfs2_fs() is calling e.g. calling unregister_shrinker() without
register_shrinker() when an error occurred during initialization.
Rename goto labels and call appropriate undo function.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>

1 files changed, 44 insertions, 46 deletions

diff --git a/fs/gfs2/main.c b/fs/gfs2/main.c
index 0a89e6f7a314..2d55e2c3333c 100644
--- a/fs/gfs2/main.c
+++ b/fs/gfs2/main.c
@@ -93,7 +93,7 @@ static int __init init_gfs2_fs(void)
 
         error = gfs2_glock_init();
         if (error)
-                goto fail;
+                goto fail_glock;
 
         error = -ENOMEM;
         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
@@ -101,7 +101,7 @@ static int __init init_gfs2_fs(void)
                                               0, 0,
                                               gfs2_init_glock_once);
         if (!gfs2_glock_cachep)
-                goto fail;
+                goto fail_cachep1;
 
         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
                                         sizeof(struct gfs2_glock) +
@@ -109,7 +109,7 @@ static int __init init_gfs2_fs(void)
                                         0, 0, gfs2_init_gl_aspace_once);
 
         if (!gfs2_glock_aspace_cachep)
-                goto fail;
+                goto fail_cachep2;
 
         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
                                               sizeof(struct gfs2_inode),
@@ -118,107 +118,105 @@ static int __init init_gfs2_fs(void)
                                                   SLAB_ACCOUNT,
                                               gfs2_init_inode_once);
         if (!gfs2_inode_cachep)
-                goto fail;
+                goto fail_cachep3;
 
         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
                                                 sizeof(struct gfs2_bufdata),
                                                 0, 0, NULL);
         if (!gfs2_bufdata_cachep)
-                goto fail;
+                goto fail_cachep4;
 
         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
                                               sizeof(struct gfs2_rgrpd),
                                               0, 0, NULL);
         if (!gfs2_rgrpd_cachep)
-                goto fail;
+                goto fail_cachep5;
 
         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
                                                sizeof(struct gfs2_quota_data),
                                                0, 0, NULL);
         if (!gfs2_quotad_cachep)
-                goto fail;
+                goto fail_cachep6;
 
         gfs2_qadata_cachep = kmem_cache_create("gfs2_qadata",
                                                sizeof(struct gfs2_qadata),
                                                0, 0, NULL);
         if (!gfs2_qadata_cachep)
-                goto fail;
+                goto fail_cachep7;
 
         error = register_shrinker(&gfs2_qd_shrinker);
         if (error)
-                goto fail;
+                goto fail_shrinker;
 
         error = register_filesystem(&gfs2_fs_type);
         if (error)
-                goto fail;
+                goto fail_fs1;
 
         error = register_filesystem(&gfs2meta_fs_type);
         if (error)
-                goto fail_unregister;
+                goto fail_fs2;
 
         error = -ENOMEM;
         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
                                           WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
         if (!gfs_recovery_wq)
-                goto fail_wq;
+                goto fail_wq1;
 
         gfs2_control_wq = alloc_workqueue("gfs2_control",
                                           WQ_UNBOUND | WQ_FREEZABLE, 0);
         if (!gfs2_control_wq)
-                goto fail_recovery;
+                goto fail_wq2;
 
         gfs2_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0);
 
         if (!gfs2_freeze_wq)
-                goto fail_control;
+                goto fail_wq3;
 
         gfs2_page_pool = mempool_create_page_pool(64, 0);
         if (!gfs2_page_pool)
-                goto fail_freeze;
+                goto fail_mempool;
 
-        gfs2_register_debugfs();
+        error = gfs2_register_debugfs();
+        if (error)
+                goto fail_debugfs;
 
         pr_info("GFS2 installed\n");
 
         return 0;
 
-fail_freeze:
+fail_debugfs:
+        mempool_destroy(gfs2_page_pool);
+fail_mempool:
         destroy_workqueue(gfs2_freeze_wq);
-fail_control:
+fail_wq3:
         destroy_workqueue(gfs2_control_wq);
-fail_recovery:
+fail_wq2:
         destroy_workqueue(gfs_recovery_wq);
-fail_wq:
+fail_wq1:
         unregister_filesystem(&gfs2meta_fs_type);
-fail_unregister:
+fail_fs2:
         unregister_filesystem(&gfs2_fs_type);
-fail:
-        list_lru_destroy(&gfs2_qd_lru);
-fail_lru:
+fail_fs1:
         unregister_shrinker(&gfs2_qd_shrinker);
+fail_shrinker:
+        kmem_cache_destroy(gfs2_qadata_cachep);
+fail_cachep7:
+        kmem_cache_destroy(gfs2_quotad_cachep);
+fail_cachep6:
+        kmem_cache_destroy(gfs2_rgrpd_cachep);
+fail_cachep5:
+        kmem_cache_destroy(gfs2_bufdata_cachep);
+fail_cachep4:
+        kmem_cache_destroy(gfs2_inode_cachep);
+fail_cachep3:
+        kmem_cache_destroy(gfs2_glock_aspace_cachep);
+fail_cachep2:
+        kmem_cache_destroy(gfs2_glock_cachep);
+fail_cachep1:
         gfs2_glock_exit();
-
-        if (gfs2_qadata_cachep)
-                kmem_cache_destroy(gfs2_qadata_cachep);
-
-        if (gfs2_quotad_cachep)
-                kmem_cache_destroy(gfs2_quotad_cachep);
-
-        if (gfs2_rgrpd_cachep)
-                kmem_cache_destroy(gfs2_rgrpd_cachep);
-
-        if (gfs2_bufdata_cachep)
-                kmem_cache_destroy(gfs2_bufdata_cachep);
-
-        if (gfs2_inode_cachep)
-                kmem_cache_destroy(gfs2_inode_cachep);
-
-        if (gfs2_glock_aspace_cachep)
-                kmem_cache_destroy(gfs2_glock_aspace_cachep);
-
-        if (gfs2_glock_cachep)
-                kmem_cache_destroy(gfs2_glock_cachep);
-
+fail_glock:
+        list_lru_destroy(&gfs2_qd_lru);
+fail_lru:
         gfs2_sys_uninit();
         return error;
 }