[RFC v2 PATCH 03/10] block: add block_device_operations methods to set and get reserved space

[Brian Foster <bfoster@xxxxxxxxxx>]

From: Mike Snitzer <snitzer@xxxxxxxxxx>

[BF:
 - Killed wrapper functions.
 - Condensed to single bdev op.]

Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
---
 include/linux/blkdev.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 669e419..6c6ea96 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1650,6 +1650,10 @@ struct blk_dax_ctl {
        pfn_t pfn;
 };
 
+#define BDEV_RES_GET           0
+#define BDEV_RES_MOD           (1 << 0)
+#define BDEV_RES_PROVISION     (1 << 1)
+
 struct block_device_operations {
        int (*open) (struct block_device *, fmode_t);
        void (*release) (struct gendisk *, fmode_t);
@@ -1667,6 +1671,8 @@ struct block_device_operations {
        int (*getgeo)(struct block_device *, struct hd_geometry *);
        /* this callback is with swap_lock and sometimes page table lock held */
        void (*swap_slot_free_notify) (struct block_device *, unsigned long);
+       int (*reserve_space) (struct block_device *, int, sector_t, sector_t,
+                             sector_t *);
        struct module *owner;
        const struct pr_ops *pr_ops;
 };
-- 
2.4.11