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-rw-r--r--fs/super.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/fs/super.c b/fs/super.c
index b8b6a086c03b..0f51a437c269 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -446,6 +446,11 @@ void generic_shutdown_super(struct super_block *sb)
hlist_del_init(&sb->s_instances);
spin_unlock(&sb_lock);
up_write(&sb->s_umount);
+ if (sb->s_iflags & SB_I_DYNBDI) {
+ bdi_put(sb->s_bdi);
+ sb->s_bdi = &noop_backing_dev_info;
+ sb->s_iflags &= ~SB_I_DYNBDI;
+ }
}
EXPORT_SYMBOL(generic_shutdown_super);
@@ -1256,6 +1261,50 @@ out:
}
/*
+ * Setup private BDI for given superblock. It gets automatically cleaned up
+ * in generic_shutdown_super().
+ */
+int super_setup_bdi_name(struct super_block *sb, char *fmt, ...)
+{
+ struct backing_dev_info *bdi;
+ int err;
+ va_list args;
+
+ bdi = bdi_alloc(GFP_KERNEL);
+ if (!bdi)
+ return -ENOMEM;
+
+ bdi->name = sb->s_type->name;
+
+ va_start(args, fmt);
+ err = bdi_register_va(bdi, NULL, fmt, args);
+ va_end(args);
+ if (err) {
+ bdi_put(bdi);
+ return err;
+ }
+ WARN_ON(sb->s_bdi != &noop_backing_dev_info);
+ sb->s_bdi = bdi;
+ sb->s_iflags |= SB_I_DYNBDI;
+
+ return 0;
+}
+EXPORT_SYMBOL(super_setup_bdi_name);
+
+/*
+ * Setup private BDI for given superblock. I gets automatically cleaned up
+ * in generic_shutdown_super().
+ */
+int super_setup_bdi(struct super_block *sb)
+{
+ static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
+
+ return super_setup_bdi_name(sb, "%.28s-%ld", sb->s_type->name,
+ atomic_long_inc_return(&bdi_seq));
+}
+EXPORT_SYMBOL(super_setup_bdi);
+
+/*
* This is an internal function, please use sb_end_{write,pagefault,intwrite}
* instead.
*/