Wrapper for lower-level revalidate_disk routines.
This is a wrapper for the lower-level revalidate_disk call-backs such
as sd_revalidate_disk(). It allows us to perform pre and post
operations when calling them.
We will use this wrapper in a later patch to adjust block device sizes
after an online resize (a _post_ operation).
Signed-off-by: Andrew Patterson <andrew.patterson@xxxxxx>
---
fs/block_dev.c | 21 +++++++++++++++++++++
include/linux/fs.h | 1 +
2 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index aff5421..30bafca 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -868,6 +868,27 @@ struct block_device *open_by_devnum(dev_t dev, unsigned mode)
EXPORT_SYMBOL(open_by_devnum);
+/**
+ * revalidate_disk - wrapper for lower-level driver's revalidate_disk
+ * call-back
+ *
+ * @disk: struct gendisk to be revalidated
+ *
+ * This routine is a wrapper for lower-level driver's revalidate_disk
+ * call-backs. It is used to do common pre and post operations needed
+ * for all revalidate_disk operations.
+ */
+int revalidate_disk(struct gendisk *disk)
+{
+ int ret = 0;
+
+ if (disk->fops->revalidate_disk)
+ ret = disk->fops->revalidate_disk(disk);
+
+ return ret;
+}
+EXPORT_SYMBOL(revalidate_disk);
+
/*
* This routine checks whether a removable media has been changed,
* and invalidates all buffer-cache-entries in that case. This
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 580b513..28756a9 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1718,6 +1718,7 @@ extern int fs_may_remount_ro(struct super_block *);
*/
#define bio_data_dir(bio) ((bio)->bi_rw & 1)
+extern int revalidate_disk(struct gendisk *);
extern int check_disk_change(struct block_device *);
extern int __invalidate_device(struct block_device *);
extern int invalidate_partition(struct gendisk *, int);
--
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