70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
/*
|
|
* Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
|
|
*/
|
|
#include <linux/fs.h>
|
|
#include <linux/sunrpc/sched.h>
|
|
#include <linux/nfs.h>
|
|
#include <linux/nfs3.h>
|
|
#include <linux/nfs4.h>
|
|
#include <linux/nfs_xdr.h>
|
|
#include <linux/nfs_fs.h>
|
|
#include "nfs4_fs.h"
|
|
#include "nfs42.h"
|
|
|
|
static int nfs42_set_rw_stateid(nfs4_stateid *dst, struct file *file,
|
|
fmode_t fmode)
|
|
{
|
|
struct nfs_open_context *open;
|
|
struct nfs_lock_context *lock;
|
|
int ret;
|
|
|
|
open = get_nfs_open_context(nfs_file_open_context(file));
|
|
lock = nfs_get_lock_context(open);
|
|
if (IS_ERR(lock)) {
|
|
put_nfs_open_context(open);
|
|
return PTR_ERR(lock);
|
|
}
|
|
|
|
ret = nfs4_set_rw_stateid(dst, open, lock, fmode);
|
|
|
|
nfs_put_lock_context(lock);
|
|
put_nfs_open_context(open);
|
|
return ret;
|
|
}
|
|
|
|
loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
|
|
{
|
|
struct inode *inode = file_inode(filep);
|
|
struct nfs42_seek_args args = {
|
|
.sa_fh = NFS_FH(inode),
|
|
.sa_offset = offset,
|
|
.sa_what = (whence == SEEK_HOLE) ?
|
|
NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
|
|
};
|
|
struct nfs42_seek_res res;
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
|
|
.rpc_argp = &args,
|
|
.rpc_resp = &res,
|
|
};
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
int status;
|
|
|
|
if (!(server->caps & NFS_CAP_SEEK))
|
|
return -ENOTSUPP;
|
|
|
|
status = nfs42_set_rw_stateid(&args.sa_stateid, filep, FMODE_READ);
|
|
if (status)
|
|
return status;
|
|
|
|
nfs_wb_all(inode);
|
|
status = nfs4_call_sync(server->client, server, &msg,
|
|
&args.seq_args, &res.seq_res, 0);
|
|
if (status == -ENOTSUPP)
|
|
server->caps &= ~NFS_CAP_SEEK;
|
|
if (status)
|
|
return status;
|
|
|
|
return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
|
|
}
|