@@ -2,4 +2,4 @@
# Makefile for the pNFS block layout driver kernel module
#
obj-$(CONFIG_PNFS_BLOCK) += blocklayoutdriver.o
-blocklayoutdriver-objs := blocklayout.o block-device-discovery-pipe.o extents.o
+blocklayoutdriver-objs := blocklayout.o block-device-discovery-pipe.o extents.o blocklayoutdev.o
@@ -35,6 +35,12 @@
#include <linux/nfs_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,
@@ -87,6 +93,15 @@ static inline struct pnfs_block_layout *BLK_LO2EXT(struct pnfs_layout_hdr *lo)
return container_of(lo, struct pnfs_block_layout, bl_layout);
}
+/* blocklayoutdev.c */
+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);
+
#include <linux/sunrpc/simple_rpc_pipefs.h>
extern struct pipefs_list bl_device_list;
new file mode 100644
@@ -0,0 +1,151 @@
+/*
+ * linux/fs/nfs/blocklayout/blocklayoutdev.c
+ *
+ * Device operations for the pnfs nfs4 file layout driver.
+ *
+ * Copyright (c) 2006 The Regents of the University of Michigan.
+ * All rights reserved.
+ *
+ * Andy Adamson <andros@citi.umich.edu>
+ * Fred Isaman <iisaman@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/module.h>
+#include <linux/buffer_head.h> /* __bread */
+
+#include <linux/genhd.h>
+#include <linux/blkdev.h>
+#include <linux/hash.h>
+
+#include "blocklayout.h"
+
+#define NFSDBG_FACILITY NFSDBG_PNFS_LD
+
+uint32_t *blk_overflow(uint32_t *p, uint32_t *end, size_t nbytes)
+{
+ uint32_t *q = p + XDR_QUADLEN(nbytes);
+ if (unlikely(q > end || q < p))
+ return NULL;
+ return p;
+}
+EXPORT_SYMBOL(blk_overflow);
+
+/* Open a block_device by device number. */
+struct block_device *nfs4_blkdev_get(dev_t dev)
+{
+ struct block_device *bd;
+
+ dprintk("%s enter\n", __func__);
+ bd = blkdev_get_by_dev(dev, FMODE_READ, NULL);
+ if (IS_ERR(bd))
+ goto fail;
+ return bd;
+fail:
+ dprintk("%s failed to open device : %ld\n",
+ __func__, PTR_ERR(bd));
+ return NULL;
+}
+
+/*
+ * Release the block device
+ */
+int nfs4_blkdev_put(struct block_device *bdev)
+{
+ dprintk("%s for device %d:%d\n", __func__, MAJOR(bdev->bd_dev),
+ MINOR(bdev->bd_dev));
+ return blkdev_put(bdev, FMODE_READ);
+}
+
+/* Decodes pnfs_block_deviceaddr4 (draft-8) which is XDR encoded
+ * in dev->dev_addr_buf.
+ */
+struct pnfs_block_dev *
+nfs4_blk_decode_device(struct nfs_server *server,
+ struct pnfs_device *dev,
+ struct list_head *sdlist)
+{
+ struct pnfs_block_dev *rv = NULL;
+ struct block_device *bd = NULL;
+ struct pipefs_hdr *msg = NULL, *reply = NULL;
+ uint32_t major, minor;
+
+ dprintk("%s enter\n", __func__);
+
+ if (IS_ERR(bl_device_pipe))
+ return NULL;
+ dprintk("%s CREATING PIPEFS MESSAGE\n", __func__);
+ dprintk("%s: deviceid: %s, mincount: %d\n", __func__, dev->dev_id.data,
+ dev->mincount);
+ msg = pipefs_alloc_init_msg(0, BL_DEVICE_MOUNT, 0, dev->area,
+ dev->mincount);
+ if (IS_ERR(msg)) {
+ dprintk("ERROR: couldn't make pipefs message.\n");
+ goto out_err;
+ }
+ msg->msgid = hash_ptr(&msg, sizeof(msg->msgid) * 8);
+ msg->status = BL_DEVICE_REQUEST_INIT;
+
+ dprintk("%s CALLING USERSPACE DAEMON\n", __func__);
+ reply = pipefs_queue_upcall_waitreply(bl_device_pipe, msg,
+ &bl_device_list, 0, 0);
+
+ if (IS_ERR(reply)) {
+ dprintk("ERROR: upcall_waitreply failed\n");
+ goto out_err;
+ }
+ if (reply->status != BL_DEVICE_REQUEST_PROC) {
+ dprintk("%s failed to open device: %ld\n",
+ __func__, PTR_ERR(bd));
+ goto out_err;
+ }
+ memcpy(&major, (uint32_t *)(payload_of(reply)), sizeof(uint32_t));
+ memcpy(&minor, (uint32_t *)(payload_of(reply) + sizeof(uint32_t)),
+ sizeof(uint32_t));
+ bd = nfs4_blkdev_get(MKDEV(major, minor));
+ if (IS_ERR(bd)) {
+ dprintk("%s failed to open device : %ld\n",
+ __func__, PTR_ERR(bd));
+ goto out_err;
+ }
+
+ rv = kzalloc(sizeof(*rv), GFP_KERNEL);
+ if (!rv)
+ goto out_err;
+
+ rv->bm_mdev = bd;
+ memcpy(&rv->bm_mdevid, &dev->dev_id, sizeof(struct nfs4_deviceid));
+ dprintk("%s Created device %s with bd_block_size %u\n",
+ __func__,
+ bd->bd_disk->disk_name,
+ bd->bd_block_size);
+ kfree(reply);
+ kfree(msg);
+ return rv;
+
+out_err:
+ kfree(rv);
+ if (!IS_ERR(reply))
+ kfree(reply);
+ if (!IS_ERR(msg))
+ kfree(msg);
+ return NULL;
+}