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![Xu Wang](/assets/img/avatar_default.png)
Replace a comma between expression statements by a semicolon. Signed-off-by: Xu Wang <vulab@iscas.ac.cn> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
288 lines
7.3 KiB
C
288 lines
7.3 KiB
C
/*
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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 <andros@citi.umich.edu>
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* Fred Isaman <iisaman@umich.edu>
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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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