Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 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 | |
Christoph Hellwig | 5c83746 | 2014-09-10 17:37:27 -0700 | [diff] [blame] | 37 | static void |
| 38 | nfs4_encode_simple(__be32 *p, struct pnfs_block_volume *b) |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 39 | { |
Christoph Hellwig | 5c83746 | 2014-09-10 17:37:27 -0700 | [diff] [blame] | 40 | int i; |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 41 | |
Christoph Hellwig | 5c83746 | 2014-09-10 17:37:27 -0700 | [diff] [blame] | 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); |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 49 | } |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 50 | } |
| 51 | |
Christoph Hellwig | 5c83746 | 2014-09-10 17:37:27 -0700 | [diff] [blame] | 52 | dev_t |
| 53 | bl_resolve_deviceid(struct nfs_server *server, struct pnfs_block_volume *b, |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 54 | gfp_t gfp_mask) |
| 55 | { |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 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; |
Christoph Hellwig | 5c83746 | 2014-09-10 17:37:27 -0700 | [diff] [blame] | 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; |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 65 | |
| 66 | dprintk("%s CREATING PIPEFS MESSAGE\n", __func__); |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 67 | |
Christoph Hellwig | e0d4ed7 | 2014-09-26 16:02:50 +0200 | [diff] [blame^] | 68 | mutex_lock(&nn->bl_mutex); |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 69 | bl_pipe_msg.bl_wq = &nn->bl_wq; |
Christoph Hellwig | 5c83746 | 2014-09-10 17:37:27 -0700 | [diff] [blame] | 70 | |
| 71 | b->simple.len += 4; /* single volume */ |
| 72 | if (b->simple.len > PAGE_SIZE) |
Christoph Hellwig | e0d4ed7 | 2014-09-26 16:02:50 +0200 | [diff] [blame^] | 73 | goto out_unlock; |
Christoph Hellwig | 5c83746 | 2014-09-10 17:37:27 -0700 | [diff] [blame] | 74 | |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 75 | memset(msg, 0, sizeof(*msg)); |
Christoph Hellwig | 5c83746 | 2014-09-10 17:37:27 -0700 | [diff] [blame] | 76 | msg->len = sizeof(*bl_msg) + b->simple.len; |
| 77 | msg->data = kzalloc(msg->len, gfp_mask); |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 78 | if (!msg->data) |
Christoph Hellwig | e0d4ed7 | 2014-09-26 16:02:50 +0200 | [diff] [blame^] | 79 | goto out_free_data; |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 80 | |
Christoph Hellwig | 5c83746 | 2014-09-10 17:37:27 -0700 | [diff] [blame] | 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); |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 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); |
Christoph Hellwig | e0d4ed7 | 2014-09-26 16:02:50 +0200 | [diff] [blame^] | 91 | goto out_free_data; |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 92 | } |
| 93 | |
| 94 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 95 | schedule(); |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 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); |
Christoph Hellwig | e0d4ed7 | 2014-09-26 16:02:50 +0200 | [diff] [blame^] | 101 | goto out_free_data; |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 102 | } |
| 103 | |
Christoph Hellwig | 5c83746 | 2014-09-10 17:37:27 -0700 | [diff] [blame] | 104 | dev = MKDEV(reply->major, reply->minor); |
Christoph Hellwig | e0d4ed7 | 2014-09-26 16:02:50 +0200 | [diff] [blame^] | 105 | out_free_data: |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 106 | kfree(msg->data); |
Christoph Hellwig | e0d4ed7 | 2014-09-26 16:02:50 +0200 | [diff] [blame^] | 107 | out_unlock: |
| 108 | mutex_unlock(&nn->bl_mutex); |
Christoph Hellwig | 5c83746 | 2014-09-10 17:37:27 -0700 | [diff] [blame] | 109 | return dev; |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 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(filp->f_dentry->d_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 | |
Christoph Hellwig | e0d4ed7 | 2014-09-26 16:02:50 +0200 | [diff] [blame^] | 238 | mutex_init(&nn->bl_mutex); |
Christoph Hellwig | 871760c | 2014-09-10 17:37:26 -0700 | [diff] [blame] | 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 __exit bl_cleanup_pipefs(void) |
| 285 | { |
| 286 | rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); |
| 287 | unregister_pernet_subsys(&nfs4blocklayout_net_ops); |
| 288 | } |