1871760ceSChristoph Hellwig /*
2871760ceSChristoph Hellwig * Copyright (c) 2006,2007 The Regents of the University of Michigan.
3871760ceSChristoph Hellwig * All rights reserved.
4871760ceSChristoph Hellwig *
5871760ceSChristoph Hellwig * Andy Adamson <andros@citi.umich.edu>
6871760ceSChristoph Hellwig * Fred Isaman <iisaman@umich.edu>
7871760ceSChristoph Hellwig *
8871760ceSChristoph Hellwig * permission is granted to use, copy, create derivative works and
9871760ceSChristoph Hellwig * redistribute this software and such derivative works for any purpose,
10871760ceSChristoph Hellwig * so long as the name of the university of michigan is not used in
11871760ceSChristoph Hellwig * any advertising or publicity pertaining to the use or distribution
12871760ceSChristoph Hellwig * of this software without specific, written prior authorization. if
13871760ceSChristoph Hellwig * the above copyright notice or any other identification of the
14871760ceSChristoph Hellwig * university of michigan is included in any copy of any portion of
15871760ceSChristoph Hellwig * this software, then the disclaimer below must also be included.
16871760ceSChristoph Hellwig *
17871760ceSChristoph Hellwig * this software is provided as is, without representation from the
18871760ceSChristoph Hellwig * university of michigan as to its fitness for any purpose, and without
19871760ceSChristoph Hellwig * warranty by the university of michigan of any kind, either express
20871760ceSChristoph Hellwig * or implied, including without limitation the implied warranties of
21871760ceSChristoph Hellwig * merchantability and fitness for a particular purpose. the regents
22871760ceSChristoph Hellwig * of the university of michigan shall not be liable for any damages,
23871760ceSChristoph Hellwig * including special, indirect, incidental, or consequential damages,
24871760ceSChristoph Hellwig * with respect to any claim arising out or in connection with the use
25871760ceSChristoph Hellwig * of the software, even if it has been or is hereafter advised of the
26871760ceSChristoph Hellwig * possibility of such damages.
27871760ceSChristoph Hellwig */
28871760ceSChristoph Hellwig
29871760ceSChristoph Hellwig #include <linux/module.h>
30871760ceSChristoph Hellwig #include <linux/blkdev.h>
31871760ceSChristoph Hellwig
32871760ceSChristoph Hellwig #include "blocklayout.h"
33871760ceSChristoph Hellwig
34871760ceSChristoph Hellwig #define NFSDBG_FACILITY NFSDBG_PNFS_LD
35871760ceSChristoph Hellwig
365c83746aSChristoph Hellwig static void
nfs4_encode_simple(__be32 * p,struct pnfs_block_volume * b)375c83746aSChristoph Hellwig nfs4_encode_simple(__be32 *p, struct pnfs_block_volume *b)
38871760ceSChristoph Hellwig {
395c83746aSChristoph Hellwig int i;
40871760ceSChristoph Hellwig
415c83746aSChristoph Hellwig *p++ = cpu_to_be32(1);
425c83746aSChristoph Hellwig *p++ = cpu_to_be32(b->type);
435c83746aSChristoph Hellwig *p++ = cpu_to_be32(b->simple.nr_sigs);
445c83746aSChristoph Hellwig for (i = 0; i < b->simple.nr_sigs; i++) {
455c83746aSChristoph Hellwig p = xdr_encode_hyper(p, b->simple.sigs[i].offset);
465c83746aSChristoph Hellwig p = xdr_encode_opaque(p, b->simple.sigs[i].sig,
475c83746aSChristoph Hellwig b->simple.sigs[i].sig_len);
485c83746aSChristoph Hellwig }
49871760ceSChristoph Hellwig }
50871760ceSChristoph Hellwig
515c83746aSChristoph Hellwig dev_t
bl_resolve_deviceid(struct nfs_server * server,struct pnfs_block_volume * b,gfp_t gfp_mask)525c83746aSChristoph Hellwig bl_resolve_deviceid(struct nfs_server *server, struct pnfs_block_volume *b,
53871760ceSChristoph Hellwig gfp_t gfp_mask)
54871760ceSChristoph Hellwig {
55871760ceSChristoph Hellwig struct net *net = server->nfs_client->cl_net;
56871760ceSChristoph Hellwig struct nfs_net *nn = net_generic(net, nfs_net_id);
57871760ceSChristoph Hellwig struct bl_dev_msg *reply = &nn->bl_mount_reply;
585c83746aSChristoph Hellwig struct bl_pipe_msg bl_pipe_msg;
595c83746aSChristoph Hellwig struct rpc_pipe_msg *msg = &bl_pipe_msg.msg;
605c83746aSChristoph Hellwig struct bl_msg_hdr *bl_msg;
615c83746aSChristoph Hellwig DECLARE_WAITQUEUE(wq, current);
625c83746aSChristoph Hellwig dev_t dev = 0;
635c83746aSChristoph Hellwig int rc;
64871760ceSChristoph Hellwig
65871760ceSChristoph Hellwig dprintk("%s CREATING PIPEFS MESSAGE\n", __func__);
66871760ceSChristoph Hellwig
67e0d4ed71SChristoph Hellwig mutex_lock(&nn->bl_mutex);
68871760ceSChristoph Hellwig bl_pipe_msg.bl_wq = &nn->bl_wq;
695c83746aSChristoph Hellwig
705c83746aSChristoph Hellwig b->simple.len += 4; /* single volume */
715c83746aSChristoph Hellwig if (b->simple.len > PAGE_SIZE)
72e0d4ed71SChristoph Hellwig goto out_unlock;
735c83746aSChristoph Hellwig
74871760ceSChristoph Hellwig memset(msg, 0, sizeof(*msg));
755c83746aSChristoph Hellwig msg->len = sizeof(*bl_msg) + b->simple.len;
765c83746aSChristoph Hellwig msg->data = kzalloc(msg->len, gfp_mask);
77871760ceSChristoph Hellwig if (!msg->data)
78e0d4ed71SChristoph Hellwig goto out_free_data;
79871760ceSChristoph Hellwig
805c83746aSChristoph Hellwig bl_msg = msg->data;
818fe5db97SXu Wang bl_msg->type = BL_DEVICE_MOUNT;
825c83746aSChristoph Hellwig bl_msg->totallen = b->simple.len;
835c83746aSChristoph Hellwig nfs4_encode_simple(msg->data + sizeof(*bl_msg), b);
84871760ceSChristoph Hellwig
85871760ceSChristoph Hellwig dprintk("%s CALLING USERSPACE DAEMON\n", __func__);
86871760ceSChristoph Hellwig add_wait_queue(&nn->bl_wq, &wq);
87871760ceSChristoph Hellwig rc = rpc_queue_upcall(nn->bl_device_pipe, msg);
88871760ceSChristoph Hellwig if (rc < 0) {
89871760ceSChristoph Hellwig remove_wait_queue(&nn->bl_wq, &wq);
90e0d4ed71SChristoph Hellwig goto out_free_data;
91871760ceSChristoph Hellwig }
92871760ceSChristoph Hellwig
93871760ceSChristoph Hellwig set_current_state(TASK_UNINTERRUPTIBLE);
94871760ceSChristoph Hellwig schedule();
95871760ceSChristoph Hellwig remove_wait_queue(&nn->bl_wq, &wq);
96871760ceSChristoph Hellwig
97871760ceSChristoph Hellwig if (reply->status != BL_DEVICE_REQUEST_PROC) {
98871760ceSChristoph Hellwig printk(KERN_WARNING "%s failed to decode device: %d\n",
99871760ceSChristoph Hellwig __func__, reply->status);
100e0d4ed71SChristoph Hellwig goto out_free_data;
101871760ceSChristoph Hellwig }
102871760ceSChristoph Hellwig
1035c83746aSChristoph Hellwig dev = MKDEV(reply->major, reply->minor);
104e0d4ed71SChristoph Hellwig out_free_data:
105871760ceSChristoph Hellwig kfree(msg->data);
106e0d4ed71SChristoph Hellwig out_unlock:
107e0d4ed71SChristoph Hellwig mutex_unlock(&nn->bl_mutex);
1085c83746aSChristoph Hellwig return dev;
109871760ceSChristoph Hellwig }
110871760ceSChristoph Hellwig
bl_pipe_downcall(struct file * filp,const char __user * src,size_t mlen)111871760ceSChristoph Hellwig static ssize_t bl_pipe_downcall(struct file *filp, const char __user *src,
112871760ceSChristoph Hellwig size_t mlen)
113871760ceSChristoph Hellwig {
11432a59234SAl Viro struct nfs_net *nn = net_generic(file_inode(filp)->i_sb->s_fs_info,
115871760ceSChristoph Hellwig nfs_net_id);
116871760ceSChristoph Hellwig
117871760ceSChristoph Hellwig if (mlen != sizeof (struct bl_dev_msg))
118871760ceSChristoph Hellwig return -EINVAL;
119871760ceSChristoph Hellwig
120871760ceSChristoph Hellwig if (copy_from_user(&nn->bl_mount_reply, src, mlen) != 0)
121871760ceSChristoph Hellwig return -EFAULT;
122871760ceSChristoph Hellwig
123871760ceSChristoph Hellwig wake_up(&nn->bl_wq);
124871760ceSChristoph Hellwig
125871760ceSChristoph Hellwig return mlen;
126871760ceSChristoph Hellwig }
127871760ceSChristoph Hellwig
bl_pipe_destroy_msg(struct rpc_pipe_msg * msg)128871760ceSChristoph Hellwig static void bl_pipe_destroy_msg(struct rpc_pipe_msg *msg)
129871760ceSChristoph Hellwig {
130871760ceSChristoph Hellwig struct bl_pipe_msg *bl_pipe_msg =
131871760ceSChristoph Hellwig container_of(msg, struct bl_pipe_msg, msg);
132871760ceSChristoph Hellwig
133871760ceSChristoph Hellwig if (msg->errno >= 0)
134871760ceSChristoph Hellwig return;
135871760ceSChristoph Hellwig wake_up(bl_pipe_msg->bl_wq);
136871760ceSChristoph Hellwig }
137871760ceSChristoph Hellwig
138871760ceSChristoph Hellwig static const struct rpc_pipe_ops bl_upcall_ops = {
139871760ceSChristoph Hellwig .upcall = rpc_pipe_generic_upcall,
140871760ceSChristoph Hellwig .downcall = bl_pipe_downcall,
141871760ceSChristoph Hellwig .destroy_msg = bl_pipe_destroy_msg,
142871760ceSChristoph Hellwig };
143871760ceSChristoph Hellwig
nfs4blocklayout_register_sb(struct super_block * sb,struct rpc_pipe * pipe)144871760ceSChristoph Hellwig static struct dentry *nfs4blocklayout_register_sb(struct super_block *sb,
145871760ceSChristoph Hellwig struct rpc_pipe *pipe)
146871760ceSChristoph Hellwig {
147871760ceSChristoph Hellwig struct dentry *dir, *dentry;
148871760ceSChristoph Hellwig
149871760ceSChristoph Hellwig dir = rpc_d_lookup_sb(sb, NFS_PIPE_DIRNAME);
150871760ceSChristoph Hellwig if (dir == NULL)
151871760ceSChristoph Hellwig return ERR_PTR(-ENOENT);
152871760ceSChristoph Hellwig dentry = rpc_mkpipe_dentry(dir, "blocklayout", NULL, pipe);
153871760ceSChristoph Hellwig dput(dir);
154871760ceSChristoph Hellwig return dentry;
155871760ceSChristoph Hellwig }
156871760ceSChristoph Hellwig
nfs4blocklayout_unregister_sb(struct super_block * sb,struct rpc_pipe * pipe)157871760ceSChristoph Hellwig static void nfs4blocklayout_unregister_sb(struct super_block *sb,
158871760ceSChristoph Hellwig struct rpc_pipe *pipe)
159871760ceSChristoph Hellwig {
160871760ceSChristoph Hellwig if (pipe->dentry)
161871760ceSChristoph Hellwig rpc_unlink(pipe->dentry);
162871760ceSChristoph Hellwig }
163871760ceSChristoph Hellwig
rpc_pipefs_event(struct notifier_block * nb,unsigned long event,void * ptr)164871760ceSChristoph Hellwig static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
165871760ceSChristoph Hellwig void *ptr)
166871760ceSChristoph Hellwig {
167871760ceSChristoph Hellwig struct super_block *sb = ptr;
168871760ceSChristoph Hellwig struct net *net = sb->s_fs_info;
169871760ceSChristoph Hellwig struct nfs_net *nn = net_generic(net, nfs_net_id);
170871760ceSChristoph Hellwig struct dentry *dentry;
171871760ceSChristoph Hellwig int ret = 0;
172871760ceSChristoph Hellwig
173871760ceSChristoph Hellwig if (!try_module_get(THIS_MODULE))
174871760ceSChristoph Hellwig return 0;
175871760ceSChristoph Hellwig
176871760ceSChristoph Hellwig if (nn->bl_device_pipe == NULL) {
177871760ceSChristoph Hellwig module_put(THIS_MODULE);
178871760ceSChristoph Hellwig return 0;
179871760ceSChristoph Hellwig }
180871760ceSChristoph Hellwig
181871760ceSChristoph Hellwig switch (event) {
182871760ceSChristoph Hellwig case RPC_PIPEFS_MOUNT:
183871760ceSChristoph Hellwig dentry = nfs4blocklayout_register_sb(sb, nn->bl_device_pipe);
184871760ceSChristoph Hellwig if (IS_ERR(dentry)) {
185871760ceSChristoph Hellwig ret = PTR_ERR(dentry);
186871760ceSChristoph Hellwig break;
187871760ceSChristoph Hellwig }
188871760ceSChristoph Hellwig nn->bl_device_pipe->dentry = dentry;
189871760ceSChristoph Hellwig break;
190871760ceSChristoph Hellwig case RPC_PIPEFS_UMOUNT:
191871760ceSChristoph Hellwig if (nn->bl_device_pipe->dentry)
192871760ceSChristoph Hellwig nfs4blocklayout_unregister_sb(sb, nn->bl_device_pipe);
193871760ceSChristoph Hellwig break;
194871760ceSChristoph Hellwig default:
195871760ceSChristoph Hellwig ret = -ENOTSUPP;
196871760ceSChristoph Hellwig break;
197871760ceSChristoph Hellwig }
198871760ceSChristoph Hellwig module_put(THIS_MODULE);
199871760ceSChristoph Hellwig return ret;
200871760ceSChristoph Hellwig }
201871760ceSChristoph Hellwig
202871760ceSChristoph Hellwig static struct notifier_block nfs4blocklayout_block = {
203871760ceSChristoph Hellwig .notifier_call = rpc_pipefs_event,
204871760ceSChristoph Hellwig };
205871760ceSChristoph Hellwig
nfs4blocklayout_register_net(struct net * net,struct rpc_pipe * pipe)206871760ceSChristoph Hellwig static struct dentry *nfs4blocklayout_register_net(struct net *net,
207871760ceSChristoph Hellwig struct rpc_pipe *pipe)
208871760ceSChristoph Hellwig {
209871760ceSChristoph Hellwig struct super_block *pipefs_sb;
210871760ceSChristoph Hellwig struct dentry *dentry;
211871760ceSChristoph Hellwig
212871760ceSChristoph Hellwig pipefs_sb = rpc_get_sb_net(net);
213871760ceSChristoph Hellwig if (!pipefs_sb)
214871760ceSChristoph Hellwig return NULL;
215871760ceSChristoph Hellwig dentry = nfs4blocklayout_register_sb(pipefs_sb, pipe);
216871760ceSChristoph Hellwig rpc_put_sb_net(net);
217871760ceSChristoph Hellwig return dentry;
218871760ceSChristoph Hellwig }
219871760ceSChristoph Hellwig
nfs4blocklayout_unregister_net(struct net * net,struct rpc_pipe * pipe)220871760ceSChristoph Hellwig static void nfs4blocklayout_unregister_net(struct net *net,
221871760ceSChristoph Hellwig struct rpc_pipe *pipe)
222871760ceSChristoph Hellwig {
223871760ceSChristoph Hellwig struct super_block *pipefs_sb;
224871760ceSChristoph Hellwig
225871760ceSChristoph Hellwig pipefs_sb = rpc_get_sb_net(net);
226871760ceSChristoph Hellwig if (pipefs_sb) {
227871760ceSChristoph Hellwig nfs4blocklayout_unregister_sb(pipefs_sb, pipe);
228871760ceSChristoph Hellwig rpc_put_sb_net(net);
229871760ceSChristoph Hellwig }
230871760ceSChristoph Hellwig }
231871760ceSChristoph Hellwig
nfs4blocklayout_net_init(struct net * net)232871760ceSChristoph Hellwig static int nfs4blocklayout_net_init(struct net *net)
233871760ceSChristoph Hellwig {
234871760ceSChristoph Hellwig struct nfs_net *nn = net_generic(net, nfs_net_id);
235871760ceSChristoph Hellwig struct dentry *dentry;
236871760ceSChristoph Hellwig
237e0d4ed71SChristoph Hellwig mutex_init(&nn->bl_mutex);
238871760ceSChristoph Hellwig init_waitqueue_head(&nn->bl_wq);
239871760ceSChristoph Hellwig nn->bl_device_pipe = rpc_mkpipe_data(&bl_upcall_ops, 0);
240871760ceSChristoph Hellwig if (IS_ERR(nn->bl_device_pipe))
241871760ceSChristoph Hellwig return PTR_ERR(nn->bl_device_pipe);
242871760ceSChristoph Hellwig dentry = nfs4blocklayout_register_net(net, nn->bl_device_pipe);
243871760ceSChristoph Hellwig if (IS_ERR(dentry)) {
244871760ceSChristoph Hellwig rpc_destroy_pipe_data(nn->bl_device_pipe);
245871760ceSChristoph Hellwig return PTR_ERR(dentry);
246871760ceSChristoph Hellwig }
247871760ceSChristoph Hellwig nn->bl_device_pipe->dentry = dentry;
248871760ceSChristoph Hellwig return 0;
249871760ceSChristoph Hellwig }
250871760ceSChristoph Hellwig
nfs4blocklayout_net_exit(struct net * net)251871760ceSChristoph Hellwig static void nfs4blocklayout_net_exit(struct net *net)
252871760ceSChristoph Hellwig {
253871760ceSChristoph Hellwig struct nfs_net *nn = net_generic(net, nfs_net_id);
254871760ceSChristoph Hellwig
255871760ceSChristoph Hellwig nfs4blocklayout_unregister_net(net, nn->bl_device_pipe);
256871760ceSChristoph Hellwig rpc_destroy_pipe_data(nn->bl_device_pipe);
257871760ceSChristoph Hellwig nn->bl_device_pipe = NULL;
258871760ceSChristoph Hellwig }
259871760ceSChristoph Hellwig
260871760ceSChristoph Hellwig static struct pernet_operations nfs4blocklayout_net_ops = {
261871760ceSChristoph Hellwig .init = nfs4blocklayout_net_init,
262871760ceSChristoph Hellwig .exit = nfs4blocklayout_net_exit,
263871760ceSChristoph Hellwig };
264871760ceSChristoph Hellwig
bl_init_pipefs(void)265871760ceSChristoph Hellwig int __init bl_init_pipefs(void)
266871760ceSChristoph Hellwig {
267871760ceSChristoph Hellwig int ret;
268871760ceSChristoph Hellwig
269871760ceSChristoph Hellwig ret = rpc_pipefs_notifier_register(&nfs4blocklayout_block);
270871760ceSChristoph Hellwig if (ret)
271871760ceSChristoph Hellwig goto out;
272871760ceSChristoph Hellwig ret = register_pernet_subsys(&nfs4blocklayout_net_ops);
273871760ceSChristoph Hellwig if (ret)
274871760ceSChristoph Hellwig goto out_unregister_notifier;
275871760ceSChristoph Hellwig return 0;
276871760ceSChristoph Hellwig
277871760ceSChristoph Hellwig out_unregister_notifier:
278871760ceSChristoph Hellwig rpc_pipefs_notifier_unregister(&nfs4blocklayout_block);
279871760ceSChristoph Hellwig out:
280871760ceSChristoph Hellwig return ret;
281871760ceSChristoph Hellwig }
282871760ceSChristoph Hellwig
bl_cleanup_pipefs(void)283d9186c03SChristoph Hellwig void bl_cleanup_pipefs(void)
284871760ceSChristoph Hellwig {
285871760ceSChristoph Hellwig rpc_pipefs_notifier_unregister(&nfs4blocklayout_block);
286871760ceSChristoph Hellwig unregister_pernet_subsys(&nfs4blocklayout_net_ops);
287871760ceSChristoph Hellwig }
288