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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 | 67 | |
e0d4ed71 | 68 | mutex_lock(&nn->bl_mutex); |
871760ce | 69 | bl_pipe_msg.bl_wq = &nn->bl_wq; |
5c83746a CH |
70 | |
71 | b->simple.len += 4; /* single volume */ | |
72 | if (b->simple.len > PAGE_SIZE) | |
e0d4ed71 | 73 | goto out_unlock; |
5c83746a | 74 | |
871760ce | 75 | memset(msg, 0, sizeof(*msg)); |
5c83746a CH |
76 | msg->len = sizeof(*bl_msg) + b->simple.len; |
77 | msg->data = kzalloc(msg->len, gfp_mask); | |
871760ce | 78 | if (!msg->data) |
e0d4ed71 | 79 | goto out_free_data; |
871760ce | 80 | |
5c83746a CH |
81 | bl_msg = msg->data; |
82 | bl_msg->type = BL_DEVICE_MOUNT, | |
83 | bl_msg->totallen = b->simple.len; | |
84 | nfs4_encode_simple(msg->data + sizeof(*bl_msg), b); | |
871760ce CH |
85 | |
86 | dprintk("%s CALLING USERSPACE DAEMON\n", __func__); | |
87 | add_wait_queue(&nn->bl_wq, &wq); | |
88 | rc = rpc_queue_upcall(nn->bl_device_pipe, msg); | |
89 | if (rc < 0) { | |
90 | remove_wait_queue(&nn->bl_wq, &wq); | |
e0d4ed71 | 91 | goto out_free_data; |
871760ce CH |
92 | } |
93 | ||
94 | set_current_state(TASK_UNINTERRUPTIBLE); | |
95 | schedule(); | |
871760ce CH |
96 | remove_wait_queue(&nn->bl_wq, &wq); |
97 | ||
98 | if (reply->status != BL_DEVICE_REQUEST_PROC) { | |
99 | printk(KERN_WARNING "%s failed to decode device: %d\n", | |
100 | __func__, reply->status); | |
e0d4ed71 | 101 | goto out_free_data; |
871760ce CH |
102 | } |
103 | ||
5c83746a | 104 | dev = MKDEV(reply->major, reply->minor); |
e0d4ed71 | 105 | out_free_data: |
871760ce | 106 | kfree(msg->data); |
e0d4ed71 CH |
107 | out_unlock: |
108 | mutex_unlock(&nn->bl_mutex); | |
5c83746a | 109 | return dev; |
871760ce CH |
110 | } |
111 | ||
112 | static ssize_t bl_pipe_downcall(struct file *filp, const char __user *src, | |
113 | size_t mlen) | |
114 | { | |
32a59234 | 115 | struct nfs_net *nn = net_generic(file_inode(filp)->i_sb->s_fs_info, |
871760ce CH |
116 | nfs_net_id); |
117 | ||
118 | if (mlen != sizeof (struct bl_dev_msg)) | |
119 | return -EINVAL; | |
120 | ||
121 | if (copy_from_user(&nn->bl_mount_reply, src, mlen) != 0) | |
122 | return -EFAULT; | |
123 | ||
124 | wake_up(&nn->bl_wq); | |
125 | ||
126 | return mlen; | |
127 | } | |
128 | ||
129 | static void bl_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
130 | { | |
131 | struct bl_pipe_msg *bl_pipe_msg = | |
132 | container_of(msg, struct bl_pipe_msg, msg); | |
133 | ||
134 | if (msg->errno >= 0) | |
135 | return; | |
136 | wake_up(bl_pipe_msg->bl_wq); | |
137 | } | |
138 | ||
139 | static const struct rpc_pipe_ops bl_upcall_ops = { | |
140 | .upcall = rpc_pipe_generic_upcall, | |
141 | .downcall = bl_pipe_downcall, | |
142 | .destroy_msg = bl_pipe_destroy_msg, | |
143 | }; | |
144 | ||
145 | static struct dentry *nfs4blocklayout_register_sb(struct super_block *sb, | |
146 | struct rpc_pipe *pipe) | |
147 | { | |
148 | struct dentry *dir, *dentry; | |
149 | ||
150 | dir = rpc_d_lookup_sb(sb, NFS_PIPE_DIRNAME); | |
151 | if (dir == NULL) | |
152 | return ERR_PTR(-ENOENT); | |
153 | dentry = rpc_mkpipe_dentry(dir, "blocklayout", NULL, pipe); | |
154 | dput(dir); | |
155 | return dentry; | |
156 | } | |
157 | ||
158 | static void nfs4blocklayout_unregister_sb(struct super_block *sb, | |
159 | struct rpc_pipe *pipe) | |
160 | { | |
161 | if (pipe->dentry) | |
162 | rpc_unlink(pipe->dentry); | |
163 | } | |
164 | ||
165 | static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, | |
166 | void *ptr) | |
167 | { | |
168 | struct super_block *sb = ptr; | |
169 | struct net *net = sb->s_fs_info; | |
170 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
171 | struct dentry *dentry; | |
172 | int ret = 0; | |
173 | ||
174 | if (!try_module_get(THIS_MODULE)) | |
175 | return 0; | |
176 | ||
177 | if (nn->bl_device_pipe == NULL) { | |
178 | module_put(THIS_MODULE); | |
179 | return 0; | |
180 | } | |
181 | ||
182 | switch (event) { | |
183 | case RPC_PIPEFS_MOUNT: | |
184 | dentry = nfs4blocklayout_register_sb(sb, nn->bl_device_pipe); | |
185 | if (IS_ERR(dentry)) { | |
186 | ret = PTR_ERR(dentry); | |
187 | break; | |
188 | } | |
189 | nn->bl_device_pipe->dentry = dentry; | |
190 | break; | |
191 | case RPC_PIPEFS_UMOUNT: | |
192 | if (nn->bl_device_pipe->dentry) | |
193 | nfs4blocklayout_unregister_sb(sb, nn->bl_device_pipe); | |
194 | break; | |
195 | default: | |
196 | ret = -ENOTSUPP; | |
197 | break; | |
198 | } | |
199 | module_put(THIS_MODULE); | |
200 | return ret; | |
201 | } | |
202 | ||
203 | static struct notifier_block nfs4blocklayout_block = { | |
204 | .notifier_call = rpc_pipefs_event, | |
205 | }; | |
206 | ||
207 | static struct dentry *nfs4blocklayout_register_net(struct net *net, | |
208 | struct rpc_pipe *pipe) | |
209 | { | |
210 | struct super_block *pipefs_sb; | |
211 | struct dentry *dentry; | |
212 | ||
213 | pipefs_sb = rpc_get_sb_net(net); | |
214 | if (!pipefs_sb) | |
215 | return NULL; | |
216 | dentry = nfs4blocklayout_register_sb(pipefs_sb, pipe); | |
217 | rpc_put_sb_net(net); | |
218 | return dentry; | |
219 | } | |
220 | ||
221 | static void nfs4blocklayout_unregister_net(struct net *net, | |
222 | struct rpc_pipe *pipe) | |
223 | { | |
224 | struct super_block *pipefs_sb; | |
225 | ||
226 | pipefs_sb = rpc_get_sb_net(net); | |
227 | if (pipefs_sb) { | |
228 | nfs4blocklayout_unregister_sb(pipefs_sb, pipe); | |
229 | rpc_put_sb_net(net); | |
230 | } | |
231 | } | |
232 | ||
233 | static int nfs4blocklayout_net_init(struct net *net) | |
234 | { | |
235 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
236 | struct dentry *dentry; | |
237 | ||
e0d4ed71 | 238 | mutex_init(&nn->bl_mutex); |
871760ce CH |
239 | init_waitqueue_head(&nn->bl_wq); |
240 | nn->bl_device_pipe = rpc_mkpipe_data(&bl_upcall_ops, 0); | |
241 | if (IS_ERR(nn->bl_device_pipe)) | |
242 | return PTR_ERR(nn->bl_device_pipe); | |
243 | dentry = nfs4blocklayout_register_net(net, nn->bl_device_pipe); | |
244 | if (IS_ERR(dentry)) { | |
245 | rpc_destroy_pipe_data(nn->bl_device_pipe); | |
246 | return PTR_ERR(dentry); | |
247 | } | |
248 | nn->bl_device_pipe->dentry = dentry; | |
249 | return 0; | |
250 | } | |
251 | ||
252 | static void nfs4blocklayout_net_exit(struct net *net) | |
253 | { | |
254 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
255 | ||
256 | nfs4blocklayout_unregister_net(net, nn->bl_device_pipe); | |
257 | rpc_destroy_pipe_data(nn->bl_device_pipe); | |
258 | nn->bl_device_pipe = NULL; | |
259 | } | |
260 | ||
261 | static struct pernet_operations nfs4blocklayout_net_ops = { | |
262 | .init = nfs4blocklayout_net_init, | |
263 | .exit = nfs4blocklayout_net_exit, | |
264 | }; | |
265 | ||
266 | int __init bl_init_pipefs(void) | |
267 | { | |
268 | int ret; | |
269 | ||
270 | ret = rpc_pipefs_notifier_register(&nfs4blocklayout_block); | |
271 | if (ret) | |
272 | goto out; | |
273 | ret = register_pernet_subsys(&nfs4blocklayout_net_ops); | |
274 | if (ret) | |
275 | goto out_unregister_notifier; | |
276 | return 0; | |
277 | ||
278 | out_unregister_notifier: | |
279 | rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); | |
280 | out: | |
281 | return ret; | |
282 | } | |
283 | ||
d9186c03 | 284 | void bl_cleanup_pipefs(void) |
871760ce CH |
285 | { |
286 | rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); | |
287 | unregister_pernet_subsys(&nfs4blocklayout_net_ops); | |
288 | } |