2 * Copyright (c) 2006,2007 The Regents of the University of Michigan.
5 * Andy Adamson <andros@citi.umich.edu>
6 * Fred Isaman <iisaman@umich.edu>
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.
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.
29 #include <linux/module.h>
30 #include <linux/genhd.h>
31 #include <linux/blkdev.h>
33 #include "blocklayout.h"
35 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
38 nfs4_encode_simple(__be32 *p, struct pnfs_block_volume *b)
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);
53 bl_resolve_deviceid(struct nfs_server *server, struct pnfs_block_volume *b,
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;
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);
66 dprintk("%s CREATING PIPEFS MESSAGE\n", __func__);
68 bl_pipe_msg.bl_wq = &nn->bl_wq;
70 b->simple.len += 4; /* single volume */
71 if (b->simple.len > PAGE_SIZE)
74 memset(msg, 0, sizeof(*msg));
75 msg->len = sizeof(*bl_msg) + b->simple.len;
76 msg->data = kzalloc(msg->len, gfp_mask);
81 bl_msg->type = BL_DEVICE_MOUNT,
82 bl_msg->totallen = b->simple.len;
83 nfs4_encode_simple(msg->data + sizeof(*bl_msg), b);
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);
89 remove_wait_queue(&nn->bl_wq, &wq);
93 set_current_state(TASK_UNINTERRUPTIBLE);
95 __set_current_state(TASK_RUNNING);
96 remove_wait_queue(&nn->bl_wq, &wq);
98 if (reply->status != BL_DEVICE_REQUEST_PROC) {
99 printk(KERN_WARNING "%s failed to decode device: %d\n",
100 __func__, reply->status);
104 dev = MKDEV(reply->major, reply->minor);
110 static ssize_t bl_pipe_downcall(struct file *filp, const char __user *src,
113 struct nfs_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info,
116 if (mlen != sizeof (struct bl_dev_msg))
119 if (copy_from_user(&nn->bl_mount_reply, src, mlen) != 0)
127 static void bl_pipe_destroy_msg(struct rpc_pipe_msg *msg)
129 struct bl_pipe_msg *bl_pipe_msg =
130 container_of(msg, struct bl_pipe_msg, msg);
134 wake_up(bl_pipe_msg->bl_wq);
137 static const struct rpc_pipe_ops bl_upcall_ops = {
138 .upcall = rpc_pipe_generic_upcall,
139 .downcall = bl_pipe_downcall,
140 .destroy_msg = bl_pipe_destroy_msg,
143 static struct dentry *nfs4blocklayout_register_sb(struct super_block *sb,
144 struct rpc_pipe *pipe)
146 struct dentry *dir, *dentry;
148 dir = rpc_d_lookup_sb(sb, NFS_PIPE_DIRNAME);
150 return ERR_PTR(-ENOENT);
151 dentry = rpc_mkpipe_dentry(dir, "blocklayout", NULL, pipe);
156 static void nfs4blocklayout_unregister_sb(struct super_block *sb,
157 struct rpc_pipe *pipe)
160 rpc_unlink(pipe->dentry);
163 static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
166 struct super_block *sb = ptr;
167 struct net *net = sb->s_fs_info;
168 struct nfs_net *nn = net_generic(net, nfs_net_id);
169 struct dentry *dentry;
172 if (!try_module_get(THIS_MODULE))
175 if (nn->bl_device_pipe == NULL) {
176 module_put(THIS_MODULE);
181 case RPC_PIPEFS_MOUNT:
182 dentry = nfs4blocklayout_register_sb(sb, nn->bl_device_pipe);
183 if (IS_ERR(dentry)) {
184 ret = PTR_ERR(dentry);
187 nn->bl_device_pipe->dentry = dentry;
189 case RPC_PIPEFS_UMOUNT:
190 if (nn->bl_device_pipe->dentry)
191 nfs4blocklayout_unregister_sb(sb, nn->bl_device_pipe);
197 module_put(THIS_MODULE);
201 static struct notifier_block nfs4blocklayout_block = {
202 .notifier_call = rpc_pipefs_event,
205 static struct dentry *nfs4blocklayout_register_net(struct net *net,
206 struct rpc_pipe *pipe)
208 struct super_block *pipefs_sb;
209 struct dentry *dentry;
211 pipefs_sb = rpc_get_sb_net(net);
214 dentry = nfs4blocklayout_register_sb(pipefs_sb, pipe);
219 static void nfs4blocklayout_unregister_net(struct net *net,
220 struct rpc_pipe *pipe)
222 struct super_block *pipefs_sb;
224 pipefs_sb = rpc_get_sb_net(net);
226 nfs4blocklayout_unregister_sb(pipefs_sb, pipe);
231 static int nfs4blocklayout_net_init(struct net *net)
233 struct nfs_net *nn = net_generic(net, nfs_net_id);
234 struct dentry *dentry;
236 init_waitqueue_head(&nn->bl_wq);
237 nn->bl_device_pipe = rpc_mkpipe_data(&bl_upcall_ops, 0);
238 if (IS_ERR(nn->bl_device_pipe))
239 return PTR_ERR(nn->bl_device_pipe);
240 dentry = nfs4blocklayout_register_net(net, nn->bl_device_pipe);
241 if (IS_ERR(dentry)) {
242 rpc_destroy_pipe_data(nn->bl_device_pipe);
243 return PTR_ERR(dentry);
245 nn->bl_device_pipe->dentry = dentry;
249 static void nfs4blocklayout_net_exit(struct net *net)
251 struct nfs_net *nn = net_generic(net, nfs_net_id);
253 nfs4blocklayout_unregister_net(net, nn->bl_device_pipe);
254 rpc_destroy_pipe_data(nn->bl_device_pipe);
255 nn->bl_device_pipe = NULL;
258 static struct pernet_operations nfs4blocklayout_net_ops = {
259 .init = nfs4blocklayout_net_init,
260 .exit = nfs4blocklayout_net_exit,
263 int __init bl_init_pipefs(void)
267 ret = rpc_pipefs_notifier_register(&nfs4blocklayout_block);
270 ret = register_pernet_subsys(&nfs4blocklayout_net_ops);
272 goto out_unregister_notifier;
275 out_unregister_notifier:
276 rpc_pipefs_notifier_unregister(&nfs4blocklayout_block);
281 void __exit bl_cleanup_pipefs(void)
283 rpc_pipefs_notifier_unregister(&nfs4blocklayout_block);
284 unregister_pernet_subsys(&nfs4blocklayout_net_ops);