pnfsblock: add device operations

Signed-off-by: Jim Rees <rees@umich.edu>
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@tonian.com>
[upcall bugfixes]
Signed-off-by: Peng Tao <peng_tao@emc.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h
index 98e2f60c2143..dd25f1b3fe1e 100644
--- a/fs/nfs/blocklayout/blocklayout.h
+++ b/fs/nfs/blocklayout/blocklayout.h
@@ -34,8 +34,16 @@
 
 #include <linux/device-mapper.h>
 #include <linux/nfs_fs.h>
+#include <linux/sunrpc/rpc_pipe_fs.h>
+
 #include "../pnfs.h"
 
+struct pnfs_block_dev {
+        struct list_head                bm_node;
+        struct nfs4_deviceid            bm_mdevid;    /* associated devid */
+        struct block_device             *bm_mdev;     /* meta device itself */
+};
+
 enum exstate4 {
         PNFS_BLOCK_READWRITE_DATA       = 0,
         PNFS_BLOCK_READ_DATA            = 1,
@@ -88,5 +96,37 @@ static inline struct pnfs_block_layout *BLK_LO2EXT(struct pnfs_layout_hdr *lo)
         return container_of(lo, struct pnfs_block_layout, bl_layout);
 }
 
+struct bl_dev_msg {
+        int status;
+        uint32_t major, minor;
+};
+
+struct bl_msg_hdr {
+        u8  type;
+        u16 totallen; /* length of entire message, including hdr itself */
+};
+
+extern struct dentry *bl_device_pipe;
+extern wait_queue_head_t bl_wq;
+
+#define BL_DEVICE_UMOUNT               0x0 /* Umount--delete devices */
+#define BL_DEVICE_MOUNT                0x1 /* Mount--create devices*/
+#define BL_DEVICE_REQUEST_INIT         0x0 /* Start request */
+#define BL_DEVICE_REQUEST_PROC         0x1 /* User level process succeeds */
+#define BL_DEVICE_REQUEST_ERR          0x2 /* User level process fails */
+
+/* blocklayoutdev.c */
+ssize_t bl_pipe_upcall(struct file *, struct rpc_pipe_msg *,
+                       char __user *, size_t);
+ssize_t bl_pipe_downcall(struct file *, const char __user *, size_t);
+void bl_pipe_destroy_msg(struct rpc_pipe_msg *);
+struct block_device *nfs4_blkdev_get(dev_t dev);
+int nfs4_blkdev_put(struct block_device *bdev);
+struct pnfs_block_dev *nfs4_blk_decode_device(struct nfs_server *server,
+                                                struct pnfs_device *dev,
+                                                struct list_head *sdlist);
+int nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo,
+                                struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
+
 void bl_put_extent(struct pnfs_block_extent *be);
 #endif /* FS_NFS_NFS4BLOCKLAYOUT_H */