blob: 737d839bc17b5aa0ae58e5350a235af1f8adfb2b [file] [log] [blame]
Jim Rees025a70e2011-07-30 20:52:43 -04001/*
2 * linux/fs/nfs/blocklayout/blocklayoutdm.c
3 *
4 * Module for the NFSv4.1 pNFS block layout driver.
5 *
6 * Copyright (c) 2007 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Fred Isaman <iisaman@umich.edu>
10 * Andy Adamson <andros@citi.umich.edu>
11 *
12 * permission is granted to use, copy, create derivative works and
13 * redistribute this software and such derivative works for any purpose,
14 * so long as the name of the university of michigan is not used in
15 * any advertising or publicity pertaining to the use or distribution
16 * of this software without specific, written prior authorization. if
17 * the above copyright notice or any other identification of the
18 * university of michigan is included in any copy of any portion of
19 * this software, then the disclaimer below must also be included.
20 *
21 * this software is provided as is, without representation from the
22 * university of michigan as to its fitness for any purpose, and without
23 * warranty by the university of michigan of any kind, either express
24 * or implied, including without limitation the implied warranties of
25 * merchantability and fitness for a particular purpose. the regents
26 * of the university of michigan shall not be liable for any damages,
27 * including special, indirect, incidental, or consequential damages,
28 * with respect to any claim arising out or in connection with the use
29 * of the software, even if it has been or is hereafter advised of the
30 * possibility of such damages.
31 */
32
33#include <linux/genhd.h> /* gendisk - used in a dprintk*/
34#include <linux/sched.h>
35#include <linux/hash.h>
36
37#include "blocklayout.h"
38
39#define NFSDBG_FACILITY NFSDBG_PNFS_LD
40
Stanislav Kinsbursky9e2e74d2012-01-10 17:04:24 +040041static void dev_remove(struct net *net, dev_t dev)
Jim Rees025a70e2011-07-30 20:52:43 -040042{
Stanislav Kinsbursky5ffaf852012-03-11 18:20:31 +040043 struct bl_pipe_msg bl_pipe_msg;
44 struct rpc_pipe_msg *msg = &bl_pipe_msg.msg;
Jim Rees025a70e2011-07-30 20:52:43 -040045 struct bl_dev_msg bl_umount_request;
46 struct bl_msg_hdr bl_msg = {
47 .type = BL_DEVICE_UMOUNT,
48 .totallen = sizeof(bl_umount_request),
49 };
50 uint8_t *dataptr;
51 DECLARE_WAITQUEUE(wq, current);
Stanislav Kinsbursky9e2e74d2012-01-10 17:04:24 +040052 struct nfs_net *nn = net_generic(net, nfs_net_id);
Jim Rees025a70e2011-07-30 20:52:43 -040053
54 dprintk("Entering %s\n", __func__);
55
Stanislav Kinsbursky5ffaf852012-03-11 18:20:31 +040056 bl_pipe_msg.bl_wq = &nn->bl_wq;
Dan Carpentere138ead2012-03-13 20:18:48 +030057 memset(msg, 0, sizeof(*msg));
Stanislav Kinsbursky5ffaf852012-03-11 18:20:31 +040058 msg->data = kzalloc(1 + sizeof(bl_umount_request), GFP_NOFS);
59 if (!msg->data)
Jim Rees025a70e2011-07-30 20:52:43 -040060 goto out;
61
62 memset(&bl_umount_request, 0, sizeof(bl_umount_request));
63 bl_umount_request.major = MAJOR(dev);
64 bl_umount_request.minor = MINOR(dev);
65
Stanislav Kinsbursky5ffaf852012-03-11 18:20:31 +040066 memcpy(msg->data, &bl_msg, sizeof(bl_msg));
67 dataptr = (uint8_t *) msg->data;
Jim Rees025a70e2011-07-30 20:52:43 -040068 memcpy(&dataptr[sizeof(bl_msg)], &bl_umount_request, sizeof(bl_umount_request));
Stanislav Kinsbursky5ffaf852012-03-11 18:20:31 +040069 msg->len = sizeof(bl_msg) + bl_msg.totallen;
Jim Rees025a70e2011-07-30 20:52:43 -040070
Stanislav Kinsbursky5ffaf852012-03-11 18:20:31 +040071 add_wait_queue(&nn->bl_wq, &wq);
72 if (rpc_queue_upcall(nn->bl_device_pipe, msg) < 0) {
73 remove_wait_queue(&nn->bl_wq, &wq);
Jim Rees025a70e2011-07-30 20:52:43 -040074 goto out;
75 }
76
77 set_current_state(TASK_UNINTERRUPTIBLE);
78 schedule();
79 __set_current_state(TASK_RUNNING);
Stanislav Kinsbursky5ffaf852012-03-11 18:20:31 +040080 remove_wait_queue(&nn->bl_wq, &wq);
Jim Rees025a70e2011-07-30 20:52:43 -040081
82out:
Stanislav Kinsbursky5ffaf852012-03-11 18:20:31 +040083 kfree(msg->data);
Jim Rees025a70e2011-07-30 20:52:43 -040084}
85
86/*
87 * Release meta device
88 */
89static void nfs4_blk_metadev_release(struct pnfs_block_dev *bdev)
90{
91 int rv;
92
93 dprintk("%s Releasing\n", __func__);
94 rv = nfs4_blkdev_put(bdev->bm_mdev);
95 if (rv)
Weston Andros Adamsona0308892012-01-26 13:32:23 -050096 printk(KERN_ERR "NFS: %s nfs4_blkdev_put returns %d\n",
Jim Rees025a70e2011-07-30 20:52:43 -040097 __func__, rv);
98
Stanislav Kinsbursky9e2e74d2012-01-10 17:04:24 +040099 dev_remove(bdev->net, bdev->bm_mdev->bd_dev);
Jim Rees025a70e2011-07-30 20:52:43 -0400100}
101
102void bl_free_block_dev(struct pnfs_block_dev *bdev)
103{
104 if (bdev) {
105 if (bdev->bm_mdev) {
106 dprintk("%s Removing DM device: %d:%d\n",
107 __func__,
108 MAJOR(bdev->bm_mdev->bd_dev),
109 MINOR(bdev->bm_mdev->bd_dev));
110 nfs4_blk_metadev_release(bdev);
111 }
112 kfree(bdev);
113 }
114}