[dm-devel] [RFC PATCH 5/9] block: add a block_device_operations method to provision space

[Brian Foster]

Signed-off-by: Brian Foster <bfoster at redhat.com>
---
 fs/block_dev.c         | 10 ++++++++++
 include/linux/blkdev.h |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 375a2e4..73e57b9 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -517,6 +517,16 @@ int blk_get_reserved_space(struct block_device *bdev, sector_t *nr_sects)
 }
 EXPORT_SYMBOL_GPL(blk_get_reserved_space);
 
+int blk_provision_space(struct block_device *bdev, sector_t offset, sector_t len)
+{
+	const struct block_device_operations *ops = bdev->bd_disk->fops;
+
+	if (!ops->provision_space)
+		return -EOPNOTSUPP;
+	return ops->provision_space(bdev, offset, len);
+}
+EXPORT_SYMBOL_GPL(blk_provision_space);
+
 /*
  * pseudo-fs
  */
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index f212fe5..d0fa8a35 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1666,6 +1666,7 @@ struct block_device_operations {
 	void (*swap_slot_free_notify) (struct block_device *, unsigned long);
 	int (*reserve_space) (struct block_device *, sector_t);
 	int (*get_reserved_space) (struct block_device *, sector_t *);
+	int (*provision_space) (struct block_device *, sector_t, sector_t);
 	struct module *owner;
 	const struct pr_ops *pr_ops;
 };
@@ -1679,6 +1680,7 @@ extern long bdev_direct_access(struct block_device *, struct blk_dax_ctl *);
 
 extern int blk_reserve_space(struct block_device *, sector_t);
 extern int blk_get_reserved_space(struct block_device *, sector_t *);
+extern int blk_provision_space(struct block_device *, sector_t, sector_t);
 #else /* CONFIG_BLOCK */
 
 struct block_device;
-- 
2.4.3