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pnfsblock: add device operations

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Signed-off-by: Jim Rees <rees@umich.edu>
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@tonian.com>
[upcall bugfixes]
Signed-off-by: Peng Tao <peng_tao@emc.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Jim Rees
2011-07-30 20:52:42 -04:00
committed by Trond Myklebust
parent 9e69296999
commit fe0a9b7408
6 changed files with 277 additions and 2 deletions
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42
fs/nfs/blocklayout/blocklayout.c
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@@ -31,6 +31,8 @@
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include "blocklayout.h"
@@ -40,6 +42,9 @@ MODULE_LICENSE("GPL");
MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>");
MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver");
struct dentry *bl_device_pipe;
wait_queue_head_t bl_wq;
static enum pnfs_try_status
bl_read_pagelist(struct nfs_read_data *rdata)
{
@@ -176,13 +181,49 @@ static struct pnfs_layoutdriver_type blocklayout_type = {
.pg_write_ops = &bl_pg_write_ops,
};
static const struct rpc_pipe_ops bl_upcall_ops = {
.upcall = bl_pipe_upcall,
.downcall = bl_pipe_downcall,
.destroy_msg = bl_pipe_destroy_msg,
};
static int __init nfs4blocklayout_init(void)
{
struct vfsmount *mnt;
struct path path;
int ret;
dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__);
ret = pnfs_register_layoutdriver(&blocklayout_type);
if (ret)
goto out;
init_waitqueue_head(&bl_wq);
mnt = rpc_get_mount();
if (IS_ERR(mnt)) {
ret = PTR_ERR(mnt);
goto out_remove;
}
ret = vfs_path_lookup(mnt->mnt_root,
mnt,
NFS_PIPE_DIRNAME, 0, &path);
if (ret)
goto out_remove;
bl_device_pipe = rpc_mkpipe(path.dentry, "blocklayout", NULL,
&bl_upcall_ops, 0);
if (IS_ERR(bl_device_pipe)) {
ret = PTR_ERR(bl_device_pipe);
goto out_remove;
}
out:
return ret;
out_remove:
pnfs_unregister_layoutdriver(&blocklayout_type);
return ret;
}
@@ -192,6 +233,7 @@ static void __exit nfs4blocklayout_exit(void)
__func__);
pnfs_unregister_layoutdriver(&blocklayout_type);
rpc_unlink(bl_device_pipe);
}
MODULE_ALIAS("nfs-layouttype4-3");