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@@ -0,0 +1,362 @@
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+/*
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+ * Copyright (c) 2006,2007 The Regents of the University of Michigan.
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+ * All rights reserved.
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+ *
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+ * Andy Adamson <andros@citi.umich.edu>
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+ * Fred Isaman <iisaman@umich.edu>
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+ *
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+ * permission is granted to use, copy, create derivative works and
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+ * redistribute this software and such derivative works for any purpose,
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+ * so long as the name of the university of michigan is not used in
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+ * any advertising or publicity pertaining to the use or distribution
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+ * of this software without specific, written prior authorization. if
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+ * the above copyright notice or any other identification of the
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+ * university of michigan is included in any copy of any portion of
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+ * this software, then the disclaimer below must also be included.
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+ *
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+ * this software is provided as is, without representation from the
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+ * university of michigan as to its fitness for any purpose, and without
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+ * warranty by the university of michigan of any kind, either express
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+ * or implied, including without limitation the implied warranties of
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+ * merchantability and fitness for a particular purpose. the regents
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+ * of the university of michigan shall not be liable for any damages,
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+ * including special, indirect, incidental, or consequential damages,
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+ * with respect to any claim arising out or in connection with the use
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+ * of the software, even if it has been or is hereafter advised of the
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+ * possibility of such damages.
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/genhd.h>
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+#include <linux/blkdev.h>
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+
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+#include "blocklayout.h"
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+
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+#define NFSDBG_FACILITY NFSDBG_PNFS_LD
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+
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+static void bl_dm_remove(struct net *net, dev_t dev)
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+{
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+ struct bl_pipe_msg bl_pipe_msg;
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+ struct rpc_pipe_msg *msg = &bl_pipe_msg.msg;
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+ struct bl_dev_msg bl_umount_request;
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+ struct bl_msg_hdr bl_msg = {
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+ .type = BL_DEVICE_UMOUNT,
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+ .totallen = sizeof(bl_umount_request),
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+ };
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+ uint8_t *dataptr;
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+ DECLARE_WAITQUEUE(wq, current);
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+ struct nfs_net *nn = net_generic(net, nfs_net_id);
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+
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+ dprintk("Entering %s\n", __func__);
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+
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+ bl_pipe_msg.bl_wq = &nn->bl_wq;
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+ memset(msg, 0, sizeof(*msg));
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+ msg->len = sizeof(bl_msg) + bl_msg.totallen;
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+ msg->data = kzalloc(msg->len, GFP_NOFS);
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+ if (!msg->data)
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+ goto out;
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+
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+ memset(&bl_umount_request, 0, sizeof(bl_umount_request));
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+ bl_umount_request.major = MAJOR(dev);
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+ bl_umount_request.minor = MINOR(dev);
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+
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+ memcpy(msg->data, &bl_msg, sizeof(bl_msg));
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+ dataptr = (uint8_t *) msg->data;
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+ memcpy(&dataptr[sizeof(bl_msg)], &bl_umount_request, sizeof(bl_umount_request));
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+
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+ add_wait_queue(&nn->bl_wq, &wq);
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+ if (rpc_queue_upcall(nn->bl_device_pipe, msg) < 0) {
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+ remove_wait_queue(&nn->bl_wq, &wq);
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+ goto out;
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+ }
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+
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+ set_current_state(TASK_UNINTERRUPTIBLE);
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+ schedule();
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+ __set_current_state(TASK_RUNNING);
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+ remove_wait_queue(&nn->bl_wq, &wq);
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+
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+out:
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+ kfree(msg->data);
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+}
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+
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+/*
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+ * Decodes pnfs_block_deviceaddr4 which is XDR encoded in dev->dev_addr_buf.
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+ */
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+struct nfs4_deviceid_node *
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+bl_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *dev,
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+ gfp_t gfp_mask)
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+{
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+ struct pnfs_block_dev *rv;
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+ struct block_device *bd;
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+ struct bl_pipe_msg bl_pipe_msg;
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+ struct rpc_pipe_msg *msg = &bl_pipe_msg.msg;
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+ struct bl_msg_hdr bl_msg = {
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+ .type = BL_DEVICE_MOUNT,
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+ .totallen = dev->mincount,
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+ };
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+ uint8_t *dataptr;
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+ DECLARE_WAITQUEUE(wq, current);
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+ int offset, len, i, rc;
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+ struct net *net = server->nfs_client->cl_net;
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+ struct nfs_net *nn = net_generic(net, nfs_net_id);
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+ struct bl_dev_msg *reply = &nn->bl_mount_reply;
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+
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+ dprintk("%s CREATING PIPEFS MESSAGE\n", __func__);
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+ dprintk("%s: deviceid: %s, mincount: %d\n", __func__, dev->dev_id.data,
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+ dev->mincount);
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+
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+ bl_pipe_msg.bl_wq = &nn->bl_wq;
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+ memset(msg, 0, sizeof(*msg));
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+ msg->data = kzalloc(sizeof(bl_msg) + dev->mincount, gfp_mask);
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+ if (!msg->data)
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+ goto out;
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+
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+ memcpy(msg->data, &bl_msg, sizeof(bl_msg));
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+ dataptr = (uint8_t *) msg->data;
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+ len = dev->mincount;
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+ offset = sizeof(bl_msg);
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+ for (i = 0; len > 0; i++) {
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+ memcpy(&dataptr[offset], page_address(dev->pages[i]),
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+ len < PAGE_CACHE_SIZE ? len : PAGE_CACHE_SIZE);
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+ len -= PAGE_CACHE_SIZE;
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+ offset += PAGE_CACHE_SIZE;
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+ }
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+ msg->len = sizeof(bl_msg) + dev->mincount;
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+
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+ dprintk("%s CALLING USERSPACE DAEMON\n", __func__);
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+ add_wait_queue(&nn->bl_wq, &wq);
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+ rc = rpc_queue_upcall(nn->bl_device_pipe, msg);
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+ if (rc < 0) {
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+ remove_wait_queue(&nn->bl_wq, &wq);
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+ goto out;
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+ }
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+
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+ set_current_state(TASK_UNINTERRUPTIBLE);
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+ schedule();
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+ __set_current_state(TASK_RUNNING);
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+ remove_wait_queue(&nn->bl_wq, &wq);
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+
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+ if (reply->status != BL_DEVICE_REQUEST_PROC) {
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+ printk(KERN_WARNING "%s failed to decode device: %d\n",
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+ __func__, reply->status);
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+ goto out;
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+ }
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+
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+ bd = blkdev_get_by_dev(MKDEV(reply->major, reply->minor),
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+ FMODE_READ, NULL);
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+ if (IS_ERR(bd)) {
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+ printk(KERN_WARNING "%s failed to open device %d:%d (%ld)\n",
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+ __func__, reply->major, reply->minor,
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+ PTR_ERR(bd));
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+ goto out;
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+ }
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+
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+ rv = kzalloc(sizeof(*rv), gfp_mask);
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+ if (!rv)
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+ goto out;
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+
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+ nfs4_init_deviceid_node(&rv->d_node, server, &dev->dev_id);
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+ rv->d_bdev = bd;
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+
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+ dprintk("%s Created device %s with bd_block_size %u\n",
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+ __func__,
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+ bd->bd_disk->disk_name,
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+ bd->bd_block_size);
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+
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+ kfree(msg->data);
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+ return &rv->d_node;
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+
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+out:
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+ kfree(msg->data);
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+ return NULL;
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+}
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+
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+void
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+bl_free_deviceid_node(struct nfs4_deviceid_node *d)
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+{
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+ struct pnfs_block_dev *dev =
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+ container_of(d, struct pnfs_block_dev, d_node);
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+ struct net *net = d->nfs_client->cl_net;
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+
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+ blkdev_put(dev->d_bdev, FMODE_READ);
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+ bl_dm_remove(net, dev->d_bdev->bd_dev);
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+
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+ kfree(dev);
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+}
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+
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+static ssize_t bl_pipe_downcall(struct file *filp, const char __user *src,
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+ size_t mlen)
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+{
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+ struct nfs_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info,
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+ nfs_net_id);
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+
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+ if (mlen != sizeof (struct bl_dev_msg))
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+ return -EINVAL;
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+
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+ if (copy_from_user(&nn->bl_mount_reply, src, mlen) != 0)
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+ return -EFAULT;
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+
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+ wake_up(&nn->bl_wq);
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+
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+ return mlen;
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+}
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+
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+static void bl_pipe_destroy_msg(struct rpc_pipe_msg *msg)
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+{
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+ struct bl_pipe_msg *bl_pipe_msg =
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+ container_of(msg, struct bl_pipe_msg, msg);
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+
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+ if (msg->errno >= 0)
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+ return;
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+ wake_up(bl_pipe_msg->bl_wq);
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+}
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+
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+static const struct rpc_pipe_ops bl_upcall_ops = {
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+ .upcall = rpc_pipe_generic_upcall,
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+ .downcall = bl_pipe_downcall,
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+ .destroy_msg = bl_pipe_destroy_msg,
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+};
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+
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+static struct dentry *nfs4blocklayout_register_sb(struct super_block *sb,
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+ struct rpc_pipe *pipe)
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+{
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+ struct dentry *dir, *dentry;
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+
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+ dir = rpc_d_lookup_sb(sb, NFS_PIPE_DIRNAME);
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+ if (dir == NULL)
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+ return ERR_PTR(-ENOENT);
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+ dentry = rpc_mkpipe_dentry(dir, "blocklayout", NULL, pipe);
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+ dput(dir);
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+ return dentry;
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+}
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+
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+static void nfs4blocklayout_unregister_sb(struct super_block *sb,
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+ struct rpc_pipe *pipe)
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+{
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+ if (pipe->dentry)
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+ rpc_unlink(pipe->dentry);
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+}
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+
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+static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
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+ void *ptr)
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+{
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+ struct super_block *sb = ptr;
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+ struct net *net = sb->s_fs_info;
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+ struct nfs_net *nn = net_generic(net, nfs_net_id);
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+ struct dentry *dentry;
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+ int ret = 0;
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+
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+ if (!try_module_get(THIS_MODULE))
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+ return 0;
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+
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+ if (nn->bl_device_pipe == NULL) {
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+ module_put(THIS_MODULE);
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+ return 0;
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+ }
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+
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+ switch (event) {
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+ case RPC_PIPEFS_MOUNT:
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+ dentry = nfs4blocklayout_register_sb(sb, nn->bl_device_pipe);
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+ if (IS_ERR(dentry)) {
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+ ret = PTR_ERR(dentry);
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+ break;
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+ }
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+ nn->bl_device_pipe->dentry = dentry;
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+ break;
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+ case RPC_PIPEFS_UMOUNT:
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+ if (nn->bl_device_pipe->dentry)
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+ nfs4blocklayout_unregister_sb(sb, nn->bl_device_pipe);
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+ break;
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+ default:
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+ ret = -ENOTSUPP;
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+ break;
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+ }
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+ module_put(THIS_MODULE);
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+ return ret;
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+}
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+
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+static struct notifier_block nfs4blocklayout_block = {
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+ .notifier_call = rpc_pipefs_event,
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+};
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+
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+static struct dentry *nfs4blocklayout_register_net(struct net *net,
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+ struct rpc_pipe *pipe)
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+{
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+ struct super_block *pipefs_sb;
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+ struct dentry *dentry;
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+
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+ pipefs_sb = rpc_get_sb_net(net);
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+ if (!pipefs_sb)
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+ return NULL;
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+ dentry = nfs4blocklayout_register_sb(pipefs_sb, pipe);
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+ rpc_put_sb_net(net);
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+ return dentry;
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+}
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+
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+static void nfs4blocklayout_unregister_net(struct net *net,
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+ struct rpc_pipe *pipe)
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+{
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+ struct super_block *pipefs_sb;
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+
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+ pipefs_sb = rpc_get_sb_net(net);
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+ if (pipefs_sb) {
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+ nfs4blocklayout_unregister_sb(pipefs_sb, pipe);
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+ rpc_put_sb_net(net);
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+ }
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+}
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+
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+static int nfs4blocklayout_net_init(struct net *net)
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+{
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+ struct nfs_net *nn = net_generic(net, nfs_net_id);
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+ struct dentry *dentry;
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+
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+ init_waitqueue_head(&nn->bl_wq);
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+ nn->bl_device_pipe = rpc_mkpipe_data(&bl_upcall_ops, 0);
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+ if (IS_ERR(nn->bl_device_pipe))
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+ return PTR_ERR(nn->bl_device_pipe);
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+ dentry = nfs4blocklayout_register_net(net, nn->bl_device_pipe);
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+ if (IS_ERR(dentry)) {
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+ rpc_destroy_pipe_data(nn->bl_device_pipe);
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+ return PTR_ERR(dentry);
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+ }
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+ nn->bl_device_pipe->dentry = dentry;
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+ return 0;
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+}
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+
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+static void nfs4blocklayout_net_exit(struct net *net)
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+{
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+ struct nfs_net *nn = net_generic(net, nfs_net_id);
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+
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+ nfs4blocklayout_unregister_net(net, nn->bl_device_pipe);
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+ rpc_destroy_pipe_data(nn->bl_device_pipe);
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+ nn->bl_device_pipe = NULL;
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+}
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+
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+static struct pernet_operations nfs4blocklayout_net_ops = {
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+ .init = nfs4blocklayout_net_init,
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+ .exit = nfs4blocklayout_net_exit,
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+};
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+
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+int __init bl_init_pipefs(void)
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+{
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+ int ret;
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+
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+ ret = rpc_pipefs_notifier_register(&nfs4blocklayout_block);
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+ if (ret)
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+ goto out;
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+ ret = register_pernet_subsys(&nfs4blocklayout_net_ops);
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+ if (ret)
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+ goto out_unregister_notifier;
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+ return 0;
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+
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+out_unregister_notifier:
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+ rpc_pipefs_notifier_unregister(&nfs4blocklayout_block);
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+out:
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+ return ret;
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+}
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+
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+void __exit bl_cleanup_pipefs(void)
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+{
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+ rpc_pipefs_notifier_unregister(&nfs4blocklayout_block);
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+ unregister_pernet_subsys(&nfs4blocklayout_net_ops);
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+}
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Christoph Hellwig