[v2,1/4] block: Add invalidate_disk() helper to invalidate the gendisk

Commit Message

Yongji Xie Sept. 22, 2021, 12:37 p.m. UTC

To hide internal implementation and simplify some driver code,
this adds a helper to invalidate the gendisk. It will clean the
gendisk's associated buffer/page caches and reset its internal
states.

Signed-off-by: Xie Yongji <[e-mail]>
---
 block/genhd.c         | 20 ++++++++++++++++++++
 include/linux/genhd.h |  2 ++
 2 files changed, 22 insertions(+)

Comments

Christoph Hellwig Sept. 22, 2021, 2:41 p.m. UTC | #1

Looks good,

Reviewed-by: Christoph Hellwig <[e-mail]>

Patch

diff --git a/block/genhd.c b/block/genhd.c
index 7b6e5e1cf956..876c0e478baf 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -601,6 +601,26 @@  void del_gendisk(struct gendisk *disk)
 }
 EXPORT_SYMBOL(del_gendisk);
 
+/**
+ * invalidate_disk - invalidate the disk
+ * @disk: the struct gendisk to invalidate
+ *
+ * A helper to invalidates the disk. It will clean the disk's associated
+ * buffer/page caches and reset its internal states so that the disk
+ * can be reused by the drivers.
+ *
+ * Context: can sleep
+ */
+void invalidate_disk(struct gendisk *disk)
+{
+	struct block_device *bdev = disk->part0;
+
+	invalidate_bdev(bdev);
+	bdev->bd_inode->i_mapping->wb_err = 0;
+	set_capacity(disk, 0);
+}
+EXPORT_SYMBOL(invalidate_disk);
+
 /* sysfs access to bad-blocks list. */
 static ssize_t disk_badblocks_show(struct device *dev,
 					struct device_attribute *attr,
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index c68d83c87f83..ea815feb3626 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -222,6 +222,8 @@  static inline int add_disk(struct gendisk *disk)
 }
 extern void del_gendisk(struct gendisk *gp);
 
+void invalidate_disk(struct gendisk *disk);
+
 void set_disk_ro(struct gendisk *disk, bool read_only);
 
 static inline int get_disk_ro(struct gendisk *disk)