1 /*
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
dev_remove(struct net * net,dev_t dev)41 static void dev_remove(struct net *net, dev_t dev)
42 {
43 struct bl_pipe_msg bl_pipe_msg;
44 struct rpc_pipe_msg *msg = &bl_pipe_msg.msg;
45 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);
52 struct nfs_net *nn = net_generic(net, nfs_net_id);
53
54 dprintk("Entering %s\n", __func__);
55
56 bl_pipe_msg.bl_wq = &nn->bl_wq;
57 memset(msg, 0, sizeof(*msg));
58 msg->len = sizeof(bl_msg) + bl_msg.totallen;
59 msg->data = kzalloc(msg->len, GFP_NOFS);
60 if (!msg->data)
61 goto out;
62
63 memset(&bl_umount_request, 0, sizeof(bl_umount_request));
64 bl_umount_request.major = MAJOR(dev);
65 bl_umount_request.minor = MINOR(dev);
66
67 memcpy(msg->data, &bl_msg, sizeof(bl_msg));
68 dataptr = (uint8_t *) msg->data;
69 memcpy(&dataptr[sizeof(bl_msg)], &bl_umount_request, sizeof(bl_umount_request));
70
71 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);
74 goto out;
75 }
76
77 set_current_state(TASK_UNINTERRUPTIBLE);
78 schedule();
79 __set_current_state(TASK_RUNNING);
80 remove_wait_queue(&nn->bl_wq, &wq);
81
82 out:
83 kfree(msg->data);
84 }
85
86 /*
87 * Release meta device
88 */
nfs4_blk_metadev_release(struct pnfs_block_dev * bdev)89 static void nfs4_blk_metadev_release(struct pnfs_block_dev *bdev)
90 {
91 dprintk("%s Releasing\n", __func__);
92 nfs4_blkdev_put(bdev->bm_mdev);
93 dev_remove(bdev->net, bdev->bm_mdev->bd_dev);
94 }
95
bl_free_block_dev(struct pnfs_block_dev * bdev)96 void bl_free_block_dev(struct pnfs_block_dev *bdev)
97 {
98 if (bdev) {
99 if (bdev->bm_mdev) {
100 dprintk("%s Removing DM device: %d:%d\n",
101 __func__,
102 MAJOR(bdev->bm_mdev->bd_dev),
103 MINOR(bdev->bm_mdev->bd_dev));
104 nfs4_blk_metadev_release(bdev);
105 }
106 kfree(bdev);
107 }
108 }
109