pnfsblock: remove 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>

3 files changed, 115 insertions, 1 deletions

diff --git a/fs/nfs/blocklayout/Makefile b/fs/nfs/blocklayout/Makefile
index 5bf3409084d..d5815505c02 100644
--- a/fs/nfs/blocklayout/Makefile
+++ b/fs/nfs/blocklayout/Makefile
@@ -2,4 +2,4 @@
 # Makefile for the pNFS block layout driver kernel module
 #
 obj-$(CONFIG_PNFS_BLOCK) += blocklayoutdriver.o
-blocklayoutdriver-objs := blocklayout.o extents.o blocklayoutdev.o
+blocklayoutdriver-objs := blocklayout.o extents.o blocklayoutdev.o blocklayoutdm.o
diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h
index dd25f1b3fe1..1527f88e00d 100644
--- a/fs/nfs/blocklayout/blocklayout.h
+++ b/fs/nfs/blocklayout/blocklayout.h
@@ -128,5 +128,8 @@ struct pnfs_block_dev *nfs4_blk_decode_device(struct nfs_server *server,
 int nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo,
                                 struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
 
+/* blocklayoutdm.c */
+void bl_free_block_dev(struct pnfs_block_dev *bdev);
+
 void bl_put_extent(struct pnfs_block_extent *be);
 #endif /* FS_NFS_NFS4BLOCKLAYOUT_H */
diff --git a/fs/nfs/blocklayout/blocklayoutdm.c b/fs/nfs/blocklayout/blocklayoutdm.c
new file mode 100644
index 00000000000..d055c755807
--- /dev/null
+++ b/fs/nfs/blocklayout/blocklayoutdm.c
@@ -0,0 +1,111 @@
+/*
+ *  linux/fs/nfs/blocklayout/blocklayoutdm.c
+ *
+ *  Module for the NFSv4.1 pNFS block layout driver.
+ *
+ *  Copyright (c) 2007 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Fred Isaman <iisaman@umich.edu>
+ *  Andy Adamson <andros@citi.umich.edu>
+ *
+ * permission is granted to use, copy, create derivative works and
+ * redistribute this software and such derivative works for any purpose,
+ * so long as the name of the university of michigan is not used in
+ * any advertising or publicity pertaining to the use or distribution
+ * of this software without specific, written prior authorization.  if
+ * the above copyright notice or any other identification of the
+ * university of michigan is included in any copy of any portion of
+ * this software, then the disclaimer below must also be included.
+ *
+ * this software is provided as is, without representation from the
+ * university of michigan as to its fitness for any purpose, and without
+ * warranty by the university of michigan of any kind, either express
+ * or implied, including without limitation the implied warranties of
+ * merchantability and fitness for a particular purpose.  the regents
+ * of the university of michigan shall not be liable for any damages,
+ * including special, indirect, incidental, or consequential damages,
+ * with respect to any claim arising out or in connection with the use
+ * of the software, even if it has been or is hereafter advised of the
+ * possibility of such damages.
+ */
+
+#include <linux/genhd.h> /* gendisk - used in a dprintk*/
+#include <linux/sched.h>
+#include <linux/hash.h>
+
+#include "blocklayout.h"
+
+#define NFSDBG_FACILITY         NFSDBG_PNFS_LD
+
+static void dev_remove(dev_t dev)
+{
+        struct rpc_pipe_msg msg;
+        struct bl_dev_msg bl_umount_request;
+        struct bl_msg_hdr bl_msg = {
+                .type = BL_DEVICE_UMOUNT,
+                .totallen = sizeof(bl_umount_request),
+        };
+        uint8_t *dataptr;
+        DECLARE_WAITQUEUE(wq, current);
+
+        dprintk("Entering %s\n", __func__);
+
+        memset(&msg, 0, sizeof(msg));
+        msg.data = kzalloc(1 + sizeof(bl_umount_request), GFP_NOFS);
+        if (!msg.data)
+                goto out;
+
+        memset(&bl_umount_request, 0, sizeof(bl_umount_request));
+        bl_umount_request.major = MAJOR(dev);
+        bl_umount_request.minor = MINOR(dev);
+
+        memcpy(msg.data, &bl_msg, sizeof(bl_msg));
+        dataptr = (uint8_t *) msg.data;
+        memcpy(&dataptr[sizeof(bl_msg)], &bl_umount_request, sizeof(bl_umount_request));
+        msg.len = sizeof(bl_msg) + bl_msg.totallen;
+
+        add_wait_queue(&bl_wq, &wq);
+        if (rpc_queue_upcall(bl_device_pipe->d_inode, &msg) < 0) {
+                remove_wait_queue(&bl_wq, &wq);
+                goto out;
+        }
+
+        set_current_state(TASK_UNINTERRUPTIBLE);
+        schedule();
+        __set_current_state(TASK_RUNNING);
+        remove_wait_queue(&bl_wq, &wq);
+
+out:
+        kfree(msg.data);
+}
+
+/*
+ * Release meta device
+ */
+static void nfs4_blk_metadev_release(struct pnfs_block_dev *bdev)
+{
+        int rv;
+
+        dprintk("%s Releasing\n", __func__);
+        rv = nfs4_blkdev_put(bdev->bm_mdev);
+        if (rv)
+                printk(KERN_ERR "%s nfs4_blkdev_put returns %d\n",
+                                __func__, rv);
+
+        dev_remove(bdev->bm_mdev->bd_dev);
+}
+
+void bl_free_block_dev(struct pnfs_block_dev *bdev)
+{
+        if (bdev) {
+                if (bdev->bm_mdev) {
+                        dprintk("%s Removing DM device: %d:%d\n",
+                                __func__,
+                                MAJOR(bdev->bm_mdev->bd_dev),
+                                MINOR(bdev->bm_mdev->bd_dev));
+                        nfs4_blk_metadev_release(bdev);
+                }
+                kfree(bdev);
+        }
+}