As we have cdev in superblock now, we can provide get_super_cdev
to get super_block by a cdev reference, similar with get_super
which is working only for block_device.
Signed-off-by: Dongsheng Yang <yangds.fnst@xxxxxxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxxx>
---
fs/super.c | 15 +++++++++++++++
include/linux/fs.h | 1 +
2 files changed, 16 insertions(+)
diff --git a/fs/super.c b/fs/super.c
index 4d667fe..321d16b 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -613,6 +613,21 @@ struct super_block *get_super(struct block_device *bdev)
}
EXPORT_SYMBOL(get_super);
+static int cdev_compare(struct super_block *sb, void *key)
+{
+ return (sb->s_cdev == (struct cdev *)key);
+}
+
+/**
+ * get_super_cdev - get the superblock of a cdev
+ * @cdev: char device to get the superblock for
+ */
+struct super_block *get_super_cdev(struct cdev *cdev)
+{
+ return __get_super(cdev_compare, cdev);
+}
+EXPORT_SYMBOL(get_super_cdev);
+
/**
* get_super_thawed - get thawed superblock of a device
* @bdev: device to get the superblock for
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 9896b62..df71cbb 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2796,6 +2796,7 @@ extern void get_filesystem(struct file_system_type *fs);
extern void put_filesystem(struct file_system_type *fs);
extern struct file_system_type *get_fs_type(const char *name);
extern struct super_block *get_super(struct block_device *);
+extern struct super_block *get_super_cdev(struct cdev *);
extern struct super_block *get_super_thawed(struct block_device *);
extern struct super_block *get_active_super(struct block_device *bdev);
extern void drop_super(struct super_block *sb);
--
1.8.4.2
--
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