bdi: convert bdi_debug_register to int

Convert bdi_debug_register to int and then do error handle for it.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: weiping zhang <zhangweiping@didichuxing.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 74b52df..b5f940c 100644 (file)
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -113,11 +113,23 @@ static const struct file_operations bdi_debug_stats_fops = {
        .release        = single_release,
 };
 
-static void bdi_debug_register(struct backing_dev_info *bdi, const char *name)
+static int bdi_debug_register(struct backing_dev_info *bdi, const char *name)
 {
+       if (!bdi_debug_root)
+               return -ENOMEM;
+
        bdi->debug_dir = debugfs_create_dir(name, bdi_debug_root);
+       if (!bdi->debug_dir)
+               return -ENOMEM;
+
        bdi->debug_stats = debugfs_create_file("stats", 0444, bdi->debug_dir,
                                               bdi, &bdi_debug_stats_fops);
+       if (!bdi->debug_stats) {
+               debugfs_remove(bdi->debug_dir);
+               return -ENOMEM;
+       }
+
+       return 0;
 }
 
 static void bdi_debug_unregister(struct backing_dev_info *bdi)
@@ -129,9 +141,10 @@ static void bdi_debug_unregister(struct backing_dev_info *bdi)
 static inline void bdi_debug_init(void)
 {
 }
-static inline void bdi_debug_register(struct backing_dev_info *bdi,
+static inline int bdi_debug_register(struct backing_dev_info *bdi,
                                      const char *name)
 {
+       return 0;
 }
 static inline void bdi_debug_unregister(struct backing_dev_info *bdi)
 {