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871760ce CH |
1 | /* |
2 | * Copyright (c) 2006,2007 The Regents of the University of Michigan. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Andy Adamson <andros@citi.umich.edu> | |
6 | * Fred Isaman <iisaman@umich.edu> | |
7 | * | |
8 | * permission is granted to use, copy, create derivative works and | |
9 | * redistribute this software and such derivative works for any purpose, | |
10 | * so long as the name of the university of michigan is not used in | |
11 | * any advertising or publicity pertaining to the use or distribution | |
12 | * of this software without specific, written prior authorization. if | |
13 | * the above copyright notice or any other identification of the | |
14 | * university of michigan is included in any copy of any portion of | |
15 | * this software, then the disclaimer below must also be included. | |
16 | * | |
17 | * this software is provided as is, without representation from the | |
18 | * university of michigan as to its fitness for any purpose, and without | |
19 | * warranty by the university of michigan of any kind, either express | |
20 | * or implied, including without limitation the implied warranties of | |
21 | * merchantability and fitness for a particular purpose. the regents | |
22 | * of the university of michigan shall not be liable for any damages, | |
23 | * including special, indirect, incidental, or consequential damages, | |
24 | * with respect to any claim arising out or in connection with the use | |
25 | * of the software, even if it has been or is hereafter advised of the | |
26 | * possibility of such damages. | |
27 | */ | |
28 | ||
29 | #include <linux/module.h> | |
30 | #include <linux/genhd.h> | |
31 | #include <linux/blkdev.h> | |
32 | ||
33 | #include "blocklayout.h" | |
34 | ||
35 | #define NFSDBG_FACILITY NFSDBG_PNFS_LD | |
36 | ||
5c83746a CH |
37 | static void |
38 | nfs4_encode_simple(__be32 *p, struct pnfs_block_volume *b) | |
871760ce | 39 | { |
5c83746a CH |
40 | int i; |
41 | ||
42 | *p++ = cpu_to_be32(1); | |
43 | *p++ = cpu_to_be32(b->type); | |
44 | *p++ = cpu_to_be32(b->simple.nr_sigs); | |
45 | for (i = 0; i < b->simple.nr_sigs; i++) { | |
46 | p = xdr_encode_hyper(p, b->simple.sigs[i].offset); | |
47 | p = xdr_encode_opaque(p, b->simple.sigs[i].sig, | |
48 | b->simple.sigs[i].sig_len); | |
871760ce | 49 | } |
871760ce CH |
50 | } |
51 | ||
5c83746a CH |
52 | dev_t |
53 | bl_resolve_deviceid(struct nfs_server *server, struct pnfs_block_volume *b, | |
871760ce CH |
54 | gfp_t gfp_mask) |
55 | { | |
871760ce CH |
56 | struct net *net = server->nfs_client->cl_net; |
57 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
58 | struct bl_dev_msg *reply = &nn->bl_mount_reply; | |
5c83746a CH |
59 | struct bl_pipe_msg bl_pipe_msg; |
60 | struct rpc_pipe_msg *msg = &bl_pipe_msg.msg; | |
61 | struct bl_msg_hdr *bl_msg; | |
62 | DECLARE_WAITQUEUE(wq, current); | |
63 | dev_t dev = 0; | |
64 | int rc; | |
871760ce CH |
65 | |
66 | dprintk("%s CREATING PIPEFS MESSAGE\n", __func__); | |
871760ce CH |
67 | |
68 | bl_pipe_msg.bl_wq = &nn->bl_wq; | |
5c83746a CH |
69 | |
70 | b->simple.len += 4; /* single volume */ | |
71 | if (b->simple.len > PAGE_SIZE) | |
72 | return -EIO; | |
73 | ||
871760ce | 74 | memset(msg, 0, sizeof(*msg)); |
5c83746a CH |
75 | msg->len = sizeof(*bl_msg) + b->simple.len; |
76 | msg->data = kzalloc(msg->len, gfp_mask); | |
871760ce CH |
77 | if (!msg->data) |
78 | goto out; | |
79 | ||
5c83746a CH |
80 | bl_msg = msg->data; |
81 | bl_msg->type = BL_DEVICE_MOUNT, | |
82 | bl_msg->totallen = b->simple.len; | |
83 | nfs4_encode_simple(msg->data + sizeof(*bl_msg), b); | |
871760ce CH |
84 | |
85 | dprintk("%s CALLING USERSPACE DAEMON\n", __func__); | |
86 | add_wait_queue(&nn->bl_wq, &wq); | |
87 | rc = rpc_queue_upcall(nn->bl_device_pipe, msg); | |
88 | if (rc < 0) { | |
89 | remove_wait_queue(&nn->bl_wq, &wq); | |
90 | goto out; | |
91 | } | |
92 | ||
93 | set_current_state(TASK_UNINTERRUPTIBLE); | |
94 | schedule(); | |
871760ce CH |
95 | remove_wait_queue(&nn->bl_wq, &wq); |
96 | ||
97 | if (reply->status != BL_DEVICE_REQUEST_PROC) { | |
98 | printk(KERN_WARNING "%s failed to decode device: %d\n", | |
99 | __func__, reply->status); | |
100 | goto out; | |
101 | } | |
102 | ||
5c83746a | 103 | dev = MKDEV(reply->major, reply->minor); |
871760ce CH |
104 | out: |
105 | kfree(msg->data); | |
5c83746a | 106 | return dev; |
871760ce CH |
107 | } |
108 | ||
109 | static ssize_t bl_pipe_downcall(struct file *filp, const char __user *src, | |
110 | size_t mlen) | |
111 | { | |
112 | struct nfs_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info, | |
113 | nfs_net_id); | |
114 | ||
115 | if (mlen != sizeof (struct bl_dev_msg)) | |
116 | return -EINVAL; | |
117 | ||
118 | if (copy_from_user(&nn->bl_mount_reply, src, mlen) != 0) | |
119 | return -EFAULT; | |
120 | ||
121 | wake_up(&nn->bl_wq); | |
122 | ||
123 | return mlen; | |
124 | } | |
125 | ||
126 | static void bl_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
127 | { | |
128 | struct bl_pipe_msg *bl_pipe_msg = | |
129 | container_of(msg, struct bl_pipe_msg, msg); | |
130 | ||
131 | if (msg->errno >= 0) | |
132 | return; | |
133 | wake_up(bl_pipe_msg->bl_wq); | |
134 | } | |
135 | ||
136 | static const struct rpc_pipe_ops bl_upcall_ops = { | |
137 | .upcall = rpc_pipe_generic_upcall, | |
138 | .downcall = bl_pipe_downcall, | |
139 | .destroy_msg = bl_pipe_destroy_msg, | |
140 | }; | |
141 | ||
142 | static struct dentry *nfs4blocklayout_register_sb(struct super_block *sb, | |
143 | struct rpc_pipe *pipe) | |
144 | { | |
145 | struct dentry *dir, *dentry; | |
146 | ||
147 | dir = rpc_d_lookup_sb(sb, NFS_PIPE_DIRNAME); | |
148 | if (dir == NULL) | |
149 | return ERR_PTR(-ENOENT); | |
150 | dentry = rpc_mkpipe_dentry(dir, "blocklayout", NULL, pipe); | |
151 | dput(dir); | |
152 | return dentry; | |
153 | } | |
154 | ||
155 | static void nfs4blocklayout_unregister_sb(struct super_block *sb, | |
156 | struct rpc_pipe *pipe) | |
157 | { | |
158 | if (pipe->dentry) | |
159 | rpc_unlink(pipe->dentry); | |
160 | } | |
161 | ||
162 | static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, | |
163 | void *ptr) | |
164 | { | |
165 | struct super_block *sb = ptr; | |
166 | struct net *net = sb->s_fs_info; | |
167 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
168 | struct dentry *dentry; | |
169 | int ret = 0; | |
170 | ||
171 | if (!try_module_get(THIS_MODULE)) | |
172 | return 0; | |
173 | ||
174 | if (nn->bl_device_pipe == NULL) { | |
175 | module_put(THIS_MODULE); | |
176 | return 0; | |
177 | } | |
178 | ||
179 | switch (event) { | |
180 | case RPC_PIPEFS_MOUNT: | |
181 | dentry = nfs4blocklayout_register_sb(sb, nn->bl_device_pipe); | |
182 | if (IS_ERR(dentry)) { | |
183 | ret = PTR_ERR(dentry); | |
184 | break; | |
185 | } | |
186 | nn->bl_device_pipe->dentry = dentry; | |
187 | break; | |
188 | case RPC_PIPEFS_UMOUNT: | |
189 | if (nn->bl_device_pipe->dentry) | |
190 | nfs4blocklayout_unregister_sb(sb, nn->bl_device_pipe); | |
191 | break; | |
192 | default: | |
193 | ret = -ENOTSUPP; | |
194 | break; | |
195 | } | |
196 | module_put(THIS_MODULE); | |
197 | return ret; | |
198 | } | |
199 | ||
200 | static struct notifier_block nfs4blocklayout_block = { | |
201 | .notifier_call = rpc_pipefs_event, | |
202 | }; | |
203 | ||
204 | static struct dentry *nfs4blocklayout_register_net(struct net *net, | |
205 | struct rpc_pipe *pipe) | |
206 | { | |
207 | struct super_block *pipefs_sb; | |
208 | struct dentry *dentry; | |
209 | ||
210 | pipefs_sb = rpc_get_sb_net(net); | |
211 | if (!pipefs_sb) | |
212 | return NULL; | |
213 | dentry = nfs4blocklayout_register_sb(pipefs_sb, pipe); | |
214 | rpc_put_sb_net(net); | |
215 | return dentry; | |
216 | } | |
217 | ||
218 | static void nfs4blocklayout_unregister_net(struct net *net, | |
219 | struct rpc_pipe *pipe) | |
220 | { | |
221 | struct super_block *pipefs_sb; | |
222 | ||
223 | pipefs_sb = rpc_get_sb_net(net); | |
224 | if (pipefs_sb) { | |
225 | nfs4blocklayout_unregister_sb(pipefs_sb, pipe); | |
226 | rpc_put_sb_net(net); | |
227 | } | |
228 | } | |
229 | ||
230 | static int nfs4blocklayout_net_init(struct net *net) | |
231 | { | |
232 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
233 | struct dentry *dentry; | |
234 | ||
235 | init_waitqueue_head(&nn->bl_wq); | |
236 | nn->bl_device_pipe = rpc_mkpipe_data(&bl_upcall_ops, 0); | |
237 | if (IS_ERR(nn->bl_device_pipe)) | |
238 | return PTR_ERR(nn->bl_device_pipe); | |
239 | dentry = nfs4blocklayout_register_net(net, nn->bl_device_pipe); | |
240 | if (IS_ERR(dentry)) { | |
241 | rpc_destroy_pipe_data(nn->bl_device_pipe); | |
242 | return PTR_ERR(dentry); | |
243 | } | |
244 | nn->bl_device_pipe->dentry = dentry; | |
245 | return 0; | |
246 | } | |
247 | ||
248 | static void nfs4blocklayout_net_exit(struct net *net) | |
249 | { | |
250 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
251 | ||
252 | nfs4blocklayout_unregister_net(net, nn->bl_device_pipe); | |
253 | rpc_destroy_pipe_data(nn->bl_device_pipe); | |
254 | nn->bl_device_pipe = NULL; | |
255 | } | |
256 | ||
257 | static struct pernet_operations nfs4blocklayout_net_ops = { | |
258 | .init = nfs4blocklayout_net_init, | |
259 | .exit = nfs4blocklayout_net_exit, | |
260 | }; | |
261 | ||
262 | int __init bl_init_pipefs(void) | |
263 | { | |
264 | int ret; | |
265 | ||
266 | ret = rpc_pipefs_notifier_register(&nfs4blocklayout_block); | |
267 | if (ret) | |
268 | goto out; | |
269 | ret = register_pernet_subsys(&nfs4blocklayout_net_ops); | |
270 | if (ret) | |
271 | goto out_unregister_notifier; | |
272 | return 0; | |
273 | ||
274 | out_unregister_notifier: | |
275 | rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); | |
276 | out: | |
277 | return ret; | |
278 | } | |
279 | ||
280 | void __exit bl_cleanup_pipefs(void) | |
281 | { | |
282 | rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); | |
283 | unregister_pernet_subsys(&nfs4blocklayout_net_ops); | |
284 | } |