Commit | Line | Data |
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025a70ed JR |
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 | ||
9e2e74db | 41 | static void dev_remove(struct net *net, dev_t dev) |
025a70ed | 42 | { |
5ffaf855 SK |
43 | struct bl_pipe_msg bl_pipe_msg; |
44 | struct rpc_pipe_msg *msg = &bl_pipe_msg.msg; | |
025a70ed JR |
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); | |
9e2e74db | 52 | struct nfs_net *nn = net_generic(net, nfs_net_id); |
025a70ed JR |
53 | |
54 | dprintk("Entering %s\n", __func__); | |
55 | ||
5ffaf855 | 56 | bl_pipe_msg.bl_wq = &nn->bl_wq; |
e138ead7 | 57 | memset(msg, 0, sizeof(*msg)); |
4376c946 | 58 | msg->len = sizeof(bl_msg) + bl_msg.totallen; |
59 | msg->data = kzalloc(msg->len, GFP_NOFS); | |
5ffaf855 | 60 | if (!msg->data) |
025a70ed JR |
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 | ||
5ffaf855 SK |
67 | memcpy(msg->data, &bl_msg, sizeof(bl_msg)); |
68 | dataptr = (uint8_t *) msg->data; | |
025a70ed | 69 | memcpy(&dataptr[sizeof(bl_msg)], &bl_umount_request, sizeof(bl_umount_request)); |
025a70ed | 70 | |
5ffaf855 SK |
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); | |
025a70ed JR |
74 | goto out; |
75 | } | |
76 | ||
77 | set_current_state(TASK_UNINTERRUPTIBLE); | |
78 | schedule(); | |
79 | __set_current_state(TASK_RUNNING); | |
5ffaf855 | 80 | remove_wait_queue(&nn->bl_wq, &wq); |
025a70ed JR |
81 | |
82 | out: | |
5ffaf855 | 83 | kfree(msg->data); |
025a70ed JR |
84 | } |
85 | ||
86 | /* | |
87 | * Release meta device | |
88 | */ | |
89 | static 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) | |
a030889a | 96 | printk(KERN_ERR "NFS: %s nfs4_blkdev_put returns %d\n", |
025a70ed JR |
97 | __func__, rv); |
98 | ||
9e2e74db | 99 | dev_remove(bdev->net, bdev->bm_mdev->bd_dev); |
025a70ed JR |
100 | } |
101 | ||
102 | void 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 | } |