[PATCH 24/25] block: Remove unused functions

[Jan Kara]

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

Reviewed-by: Christoph Hellwig <h...@lst.de>
Signed-off-by: Jan Kara <j...@suse.cz>
---
 include/linux/backing-dev.h |  5 ----
 mm/backing-dev.c            | 56 +++++----------------------------------------
 2 files changed, 6 insertions(+), 55 deletions(-)

diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 47a98e6e2a65..aaeb2ec5d33c 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -17,8 +17,6 @@
 #include <linux/backing-dev-defs.h>
 #include <linux/slab.h>
 
-int __must_check bdi_init(struct backing_dev_info *bdi);
-
 static inline struct backing_dev_info *bdi_get(struct backing_dev_info *bdi)
 {
        kref_get(&bdi->refcnt);
@@ -32,12 +30,9 @@ int bdi_register(struct backing_dev_info *bdi, struct device 
*parent,
                const char *fmt, ...);
 int bdi_register_va(struct backing_dev_info *bdi, struct device *parent,
                const char *fmt, va_list args);
-int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev);
 int bdi_register_owner(struct backing_dev_info *bdi, struct device *owner);
 void bdi_unregister(struct backing_dev_info *bdi);
 
-int __must_check bdi_setup_and_register(struct backing_dev_info *, char *);
-void bdi_destroy(struct backing_dev_info *bdi);
 struct backing_dev_info *bdi_alloc_node(gfp_t gfp_mask, int node_id);
 static inline struct backing_dev_info *bdi_alloc(gfp_t gfp_mask)
 {
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])
-- 
2.12.0