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288 lines
7.3 KiB
288 lines
7.3 KiB
/* |
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* Copyright (c) 2006,2007 The Regents of the University of Michigan. |
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* All rights reserved. |
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* |
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* Andy Adamson <[email protected]> |
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* Fred Isaman <[email protected]> |
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* |
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* permission is granted to use, copy, create derivative works and |
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* redistribute this software and such derivative works for any purpose, |
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* so long as the name of the university of michigan is not used in |
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* any advertising or publicity pertaining to the use or distribution |
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* of this software without specific, written prior authorization. if |
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* the above copyright notice or any other identification of the |
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* university of michigan is included in any copy of any portion of |
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* this software, then the disclaimer below must also be included. |
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* |
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* this software is provided as is, without representation from the |
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* university of michigan as to its fitness for any purpose, and without |
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* warranty by the university of michigan of any kind, either express |
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* or implied, including without limitation the implied warranties of |
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* merchantability and fitness for a particular purpose. the regents |
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* of the university of michigan shall not be liable for any damages, |
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* including special, indirect, incidental, or consequential damages, |
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* with respect to any claim arising out or in connection with the use |
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* of the software, even if it has been or is hereafter advised of the |
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* possibility of such damages. |
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*/ |
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#include <linux/module.h> |
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#include <linux/genhd.h> |
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#include <linux/blkdev.h> |
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#include "blocklayout.h" |
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#define NFSDBG_FACILITY NFSDBG_PNFS_LD |
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static void |
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nfs4_encode_simple(__be32 *p, struct pnfs_block_volume *b) |
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{ |
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int i; |
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*p++ = cpu_to_be32(1); |
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*p++ = cpu_to_be32(b->type); |
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*p++ = cpu_to_be32(b->simple.nr_sigs); |
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for (i = 0; i < b->simple.nr_sigs; i++) { |
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p = xdr_encode_hyper(p, b->simple.sigs[i].offset); |
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p = xdr_encode_opaque(p, b->simple.sigs[i].sig, |
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b->simple.sigs[i].sig_len); |
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} |
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} |
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dev_t |
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bl_resolve_deviceid(struct nfs_server *server, struct pnfs_block_volume *b, |
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gfp_t gfp_mask) |
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{ |
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struct net *net = server->nfs_client->cl_net; |
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struct nfs_net *nn = net_generic(net, nfs_net_id); |
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struct bl_dev_msg *reply = &nn->bl_mount_reply; |
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struct bl_pipe_msg bl_pipe_msg; |
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struct rpc_pipe_msg *msg = &bl_pipe_msg.msg; |
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struct bl_msg_hdr *bl_msg; |
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DECLARE_WAITQUEUE(wq, current); |
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dev_t dev = 0; |
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int rc; |
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dprintk("%s CREATING PIPEFS MESSAGE\n", __func__); |
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mutex_lock(&nn->bl_mutex); |
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bl_pipe_msg.bl_wq = &nn->bl_wq; |
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b->simple.len += 4; /* single volume */ |
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if (b->simple.len > PAGE_SIZE) |
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goto out_unlock; |
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memset(msg, 0, sizeof(*msg)); |
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msg->len = sizeof(*bl_msg) + b->simple.len; |
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msg->data = kzalloc(msg->len, gfp_mask); |
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if (!msg->data) |
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goto out_free_data; |
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bl_msg = msg->data; |
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bl_msg->type = BL_DEVICE_MOUNT; |
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bl_msg->totallen = b->simple.len; |
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nfs4_encode_simple(msg->data + sizeof(*bl_msg), b); |
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dprintk("%s CALLING USERSPACE DAEMON\n", __func__); |
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add_wait_queue(&nn->bl_wq, &wq); |
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rc = rpc_queue_upcall(nn->bl_device_pipe, msg); |
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if (rc < 0) { |
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remove_wait_queue(&nn->bl_wq, &wq); |
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goto out_free_data; |
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} |
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set_current_state(TASK_UNINTERRUPTIBLE); |
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schedule(); |
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remove_wait_queue(&nn->bl_wq, &wq); |
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if (reply->status != BL_DEVICE_REQUEST_PROC) { |
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printk(KERN_WARNING "%s failed to decode device: %d\n", |
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__func__, reply->status); |
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goto out_free_data; |
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} |
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dev = MKDEV(reply->major, reply->minor); |
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out_free_data: |
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kfree(msg->data); |
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out_unlock: |
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mutex_unlock(&nn->bl_mutex); |
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return dev; |
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} |
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static ssize_t bl_pipe_downcall(struct file *filp, const char __user *src, |
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size_t mlen) |
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{ |
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struct nfs_net *nn = net_generic(file_inode(filp)->i_sb->s_fs_info, |
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nfs_net_id); |
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if (mlen != sizeof (struct bl_dev_msg)) |
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return -EINVAL; |
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if (copy_from_user(&nn->bl_mount_reply, src, mlen) != 0) |
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return -EFAULT; |
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wake_up(&nn->bl_wq); |
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return mlen; |
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} |
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static void bl_pipe_destroy_msg(struct rpc_pipe_msg *msg) |
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{ |
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struct bl_pipe_msg *bl_pipe_msg = |
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container_of(msg, struct bl_pipe_msg, msg); |
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if (msg->errno >= 0) |
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return; |
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wake_up(bl_pipe_msg->bl_wq); |
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} |
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static const struct rpc_pipe_ops bl_upcall_ops = { |
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.upcall = rpc_pipe_generic_upcall, |
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.downcall = bl_pipe_downcall, |
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.destroy_msg = bl_pipe_destroy_msg, |
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}; |
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static struct dentry *nfs4blocklayout_register_sb(struct super_block *sb, |
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struct rpc_pipe *pipe) |
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{ |
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struct dentry *dir, *dentry; |
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dir = rpc_d_lookup_sb(sb, NFS_PIPE_DIRNAME); |
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if (dir == NULL) |
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return ERR_PTR(-ENOENT); |
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dentry = rpc_mkpipe_dentry(dir, "blocklayout", NULL, pipe); |
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dput(dir); |
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return dentry; |
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} |
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static void nfs4blocklayout_unregister_sb(struct super_block *sb, |
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struct rpc_pipe *pipe) |
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{ |
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if (pipe->dentry) |
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rpc_unlink(pipe->dentry); |
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} |
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static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, |
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void *ptr) |
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{ |
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struct super_block *sb = ptr; |
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struct net *net = sb->s_fs_info; |
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struct nfs_net *nn = net_generic(net, nfs_net_id); |
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struct dentry *dentry; |
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int ret = 0; |
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if (!try_module_get(THIS_MODULE)) |
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return 0; |
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if (nn->bl_device_pipe == NULL) { |
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module_put(THIS_MODULE); |
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return 0; |
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} |
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switch (event) { |
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case RPC_PIPEFS_MOUNT: |
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dentry = nfs4blocklayout_register_sb(sb, nn->bl_device_pipe); |
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if (IS_ERR(dentry)) { |
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ret = PTR_ERR(dentry); |
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break; |
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} |
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nn->bl_device_pipe->dentry = dentry; |
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break; |
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case RPC_PIPEFS_UMOUNT: |
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if (nn->bl_device_pipe->dentry) |
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nfs4blocklayout_unregister_sb(sb, nn->bl_device_pipe); |
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break; |
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default: |
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ret = -ENOTSUPP; |
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break; |
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} |
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module_put(THIS_MODULE); |
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return ret; |
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} |
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static struct notifier_block nfs4blocklayout_block = { |
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.notifier_call = rpc_pipefs_event, |
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}; |
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static struct dentry *nfs4blocklayout_register_net(struct net *net, |
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struct rpc_pipe *pipe) |
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{ |
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struct super_block *pipefs_sb; |
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struct dentry *dentry; |
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pipefs_sb = rpc_get_sb_net(net); |
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if (!pipefs_sb) |
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return NULL; |
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dentry = nfs4blocklayout_register_sb(pipefs_sb, pipe); |
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rpc_put_sb_net(net); |
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return dentry; |
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} |
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static void nfs4blocklayout_unregister_net(struct net *net, |
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struct rpc_pipe *pipe) |
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{ |
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struct super_block *pipefs_sb; |
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pipefs_sb = rpc_get_sb_net(net); |
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if (pipefs_sb) { |
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nfs4blocklayout_unregister_sb(pipefs_sb, pipe); |
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rpc_put_sb_net(net); |
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} |
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} |
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static int nfs4blocklayout_net_init(struct net *net) |
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{ |
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struct nfs_net *nn = net_generic(net, nfs_net_id); |
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struct dentry *dentry; |
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mutex_init(&nn->bl_mutex); |
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init_waitqueue_head(&nn->bl_wq); |
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nn->bl_device_pipe = rpc_mkpipe_data(&bl_upcall_ops, 0); |
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if (IS_ERR(nn->bl_device_pipe)) |
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return PTR_ERR(nn->bl_device_pipe); |
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dentry = nfs4blocklayout_register_net(net, nn->bl_device_pipe); |
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if (IS_ERR(dentry)) { |
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rpc_destroy_pipe_data(nn->bl_device_pipe); |
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return PTR_ERR(dentry); |
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} |
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nn->bl_device_pipe->dentry = dentry; |
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return 0; |
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} |
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static void nfs4blocklayout_net_exit(struct net *net) |
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{ |
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struct nfs_net *nn = net_generic(net, nfs_net_id); |
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nfs4blocklayout_unregister_net(net, nn->bl_device_pipe); |
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rpc_destroy_pipe_data(nn->bl_device_pipe); |
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nn->bl_device_pipe = NULL; |
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} |
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static struct pernet_operations nfs4blocklayout_net_ops = { |
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.init = nfs4blocklayout_net_init, |
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.exit = nfs4blocklayout_net_exit, |
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}; |
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int __init bl_init_pipefs(void) |
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{ |
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int ret; |
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ret = rpc_pipefs_notifier_register(&nfs4blocklayout_block); |
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if (ret) |
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goto out; |
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ret = register_pernet_subsys(&nfs4blocklayout_net_ops); |
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if (ret) |
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goto out_unregister_notifier; |
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return 0; |
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out_unregister_notifier: |
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rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); |
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out: |
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return ret; |
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} |
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void bl_cleanup_pipefs(void) |
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{ |
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rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); |
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unregister_pernet_subsys(&nfs4blocklayout_net_ops); |
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}
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