block: Remove unused functions

Now that all backing_dev_info structure are allocated separately, we can
drop some unused functions.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 6 insertions, 50 deletions

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 3dd175986390..4dcd56947f2a 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -12,8 +12,6 @@
 #include <linux/device.h>
 #include <trace/events/writeback.h>
 
-static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
-
 struct backing_dev_info noop_backing_dev_info = {
         .name           = "noop",
         .capabilities   = BDI_CAP_NO_ACCT_AND_WRITEBACK,
@@ -242,6 +240,8 @@ static __init int bdi_class_init(void)
 }
 postcore_initcall(bdi_class_init);
 
+static int bdi_init(struct backing_dev_info *bdi);
+
 static int __init default_bdi_init(void)
 {
         int err;
@@ -820,7 +820,7 @@ static void cgwb_remove_from_bdi_list(struct bdi_writeback *wb)
 
 #endif  /* CONFIG_CGROUP_WRITEBACK */
 
-int bdi_init(struct backing_dev_info *bdi)
+static int bdi_init(struct backing_dev_info *bdi)
 {
         int ret;
 
@@ -838,7 +838,6 @@ int bdi_init(struct backing_dev_info *bdi)
 
         return ret;
 }
-EXPORT_SYMBOL(bdi_init);
 
 struct backing_dev_info *bdi_alloc_node(gfp_t gfp_mask, int node_id)
 {
@@ -897,12 +896,6 @@ int bdi_register(struct backing_dev_info *bdi, struct device *parent,
 }
 EXPORT_SYMBOL(bdi_register);
 
-int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev)
-{
-        return bdi_register(bdi, NULL, "%u:%u", MAJOR(dev), MINOR(dev));
-}
-EXPORT_SYMBOL(bdi_register_dev);
-
 int bdi_register_owner(struct backing_dev_info *bdi, struct device *owner)
 {
         int rc;
@@ -950,13 +943,6 @@ void bdi_unregister(struct backing_dev_info *bdi)
         }
 }
 
-static void bdi_exit(struct backing_dev_info *bdi)
-{
-        WARN_ON_ONCE(bdi->dev);
-        wb_exit(&bdi->wb);
-        cgwb_bdi_exit(bdi);
-}
-
 static void release_bdi(struct kref *ref)
 {
         struct backing_dev_info *bdi =
@@ -964,7 +950,9 @@ static void release_bdi(struct kref *ref)
 
         if (test_bit(WB_registered, &bdi->wb.state))
                 bdi_unregister(bdi);
-        bdi_exit(bdi);
+        WARN_ON_ONCE(bdi->dev);
+        wb_exit(&bdi->wb);
+        cgwb_bdi_exit(bdi);
         kfree(bdi);
 }
 
@@ -974,38 +962,6 @@ void bdi_put(struct backing_dev_info *bdi)
 }
 EXPORT_SYMBOL(bdi_put);
 
-void bdi_destroy(struct backing_dev_info *bdi)
-{
-        bdi_unregister(bdi);
-        bdi_exit(bdi);
-}
-EXPORT_SYMBOL(bdi_destroy);
-
-/*
- * For use from filesystems to quickly init and register a bdi associated
- * with dirty writeback
- */
-int bdi_setup_and_register(struct backing_dev_info *bdi, char *name)
-{
-        int err;
-
-        bdi->name = name;
-        bdi->capabilities = 0;
-        err = bdi_init(bdi);
-        if (err)
-                return err;
-
-        err = bdi_register(bdi, NULL, "%.28s-%ld", name,
-                           atomic_long_inc_return(&bdi_seq));
-        if (err) {
-                bdi_destroy(bdi);
-                return err;
-        }
-
-        return 0;
-}
-EXPORT_SYMBOL(bdi_setup_and_register);
-
 static wait_queue_head_t congestion_wqh[2] = {
                 __WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[0]),
                 __WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[1])