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/*
* 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(struct net *net, dev_t dev)
{
struct bl_pipe_msg bl_pipe_msg;
struct rpc_pipe_msg *msg = &bl_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);
struct nfs_net *nn = net_generic(net, nfs_net_id);
dprintk("Entering %s\n", __func__);
bl_pipe_msg.bl_wq = &nn->bl_wq;
memset(msg, 0, sizeof(*msg));
msg->len = sizeof(bl_msg) + bl_msg.totallen;
msg->data = kzalloc(msg->len, 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));
add_wait_queue(&nn->bl_wq, &wq);
if (rpc_queue_upcall(nn->bl_device_pipe, msg) < 0) {
remove_wait_queue(&nn->bl_wq, &wq);
goto out;
}
set_current_state(TASK_UNINTERRUPTIBLE);
schedule();
__set_current_state(TASK_RUNNING);
remove_wait_queue(&nn->bl_wq, &wq);
out:
kfree(msg->data);
}
/*
* Release meta device
*/
static void nfs4_blk_metadev_release(struct pnfs_block_dev *bdev)
{
dprintk("%s Releasing\n", __func__);
nfs4_blkdev_put(bdev->bm_mdev);
dev_remove(bdev->net, 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);
}
}
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