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Linux/fs/nfs/blocklayout/rpc_pipefs.c

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  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 
 37 static void
 38 nfs4_encode_simple(__be32 *p, struct pnfs_block_volume *b)
 39 {
 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);
 49         }
 50 }
 51 
 52 dev_t
 53 bl_resolve_deviceid(struct nfs_server *server, struct pnfs_block_volume *b,
 54                 gfp_t gfp_mask)
 55 {
 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);
 63         dev_t dev = 0;
 64         int rc;
 65 
 66         dprintk("%s CREATING PIPEFS MESSAGE\n", __func__);
 67 
 68         mutex_lock(&nn->bl_mutex);
 69         bl_pipe_msg.bl_wq = &nn->bl_wq;
 70 
 71         b->simple.len += 4;     /* single volume */
 72         if (b->simple.len > PAGE_SIZE)
 73                 goto out_unlock;
 74 
 75         memset(msg, 0, sizeof(*msg));
 76         msg->len = sizeof(*bl_msg) + b->simple.len;
 77         msg->data = kzalloc(msg->len, gfp_mask);
 78         if (!msg->data)
 79                 goto out_free_data;
 80 
 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);
 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);
 91                 goto out_free_data;
 92         }
 93 
 94         set_current_state(TASK_UNINTERRUPTIBLE);
 95         schedule();
 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);
101                 goto out_free_data;
102         }
103 
104         dev = MKDEV(reply->major, reply->minor);
105 out_free_data:
106         kfree(msg->data);
107 out_unlock:
108         mutex_unlock(&nn->bl_mutex);
109         return dev;
110 }
111 
112 static ssize_t bl_pipe_downcall(struct file *filp, const char __user *src,
113                          size_t mlen)
114 {
115         struct nfs_net *nn = net_generic(file_inode(filp)->i_sb->s_fs_info,
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 
238         mutex_init(&nn->bl_mutex);
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 
284 void bl_cleanup_pipefs(void)
285 {
286         rpc_pipefs_notifier_unregister(&nfs4blocklayout_block);
287         unregister_pernet_subsys(&nfs4blocklayout_net_ops);
288 }
289 

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