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/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* export.c
*
* Functions to facilitate NFS exporting
*
* Copyright (C) 2002, 2005 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/

#include <linux/fs.h>
#include <linux/types.h>

#define MLOG_MASK_PREFIX ML_EXPORT
#include <cluster/masklog.h>

#include "ocfs2.h"

#include "dir.h"
#include "dlmglue.h"
#include "dcache.h"
#include "export.h"
#include "inode.h"

#include "buffer_head_io.h"

struct ocfs2_inode_handle
{
u64 ih_blkno;
u32 ih_generation;
};

static struct dentry *ocfs2_get_dentry(struct super_block *sb,
struct ocfs2_inode_handle *handle)
{
struct inode *inode;
struct dentry *result;

mlog_entry("(0x%p, 0x%p)\n", sb, handle);

if (handle->ih_blkno == 0) {
mlog_errno(-ESTALE);
return ERR_PTR(-ESTALE);
}

inode = ocfs2_iget(OCFS2_SB(sb), handle->ih_blkno, 0, 0);

if (IS_ERR(inode))
return (void *)inode;

if (handle->ih_generation != inode->i_generation) {
iput(inode);
return ERR_PTR(-ESTALE);
}

result = d_obtain_alias(inode);
if (!IS_ERR(result))
result->d_op = &ocfs2_dentry_ops;

mlog_exit_ptr(result);
return result;
}

static struct dentry *ocfs2_get_parent(struct dentry *child)
{
int status;
u64 blkno;
struct dentry *parent;
struct inode *dir = child->d_inode;

mlog_entry("(0x%p, '%.*s')\n", child,
child->d_name.len, child->d_name.name);

mlog(0, "find parent of directory %llu\n",
(unsigned long long)OCFS2_I(dir)->ip_blkno);

status = ocfs2_inode_lock(dir, NULL, 0);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
parent = ERR_PTR(status);
goto bail;
}

status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno);
if (status < 0) {
parent = ERR_PTR(-ENOENT);
goto bail_unlock;
}

parent = d_obtain_alias(ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0));
if (!IS_ERR(parent))
parent->d_op = &ocfs2_dentry_ops;

bail_unlock:
ocfs2_inode_unlock(dir, 0);

bail:
mlog_exit_ptr(parent);

return parent;
}

static int ocfs2_encode_fh(struct dentry *dentry, u32 *fh_in, int *max_len,
int connectable)
{
struct inode *inode = dentry->d_inode;
int len = *max_len;
int type = 1;
u64 blkno;
u32 generation;
__le32 *fh = (__force __le32 *) fh_in;

mlog_entry("(0x%p, '%.*s', 0x%p, %d, %d)\n", dentry,
dentry->d_name.len, dentry->d_name.name,
fh, len, connectable);

if (len < 3 || (connectable && len < 6)) {
mlog(ML_ERROR, "fh buffer is too small for encoding\n");
type = 255;
goto bail;
}

blkno = OCFS2_I(inode)->ip_blkno;
generation = inode->i_generation;

mlog(0, "Encoding fh: blkno: %llu, generation: %u\n",
(unsigned long long)blkno, generation);

len = 3;
fh[0] = cpu_to_le32((u32)(blkno >> 32));
fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff));
fh[2] = cpu_to_le32(generation);

if (connectable && !S_ISDIR(inode->i_mode)) {
struct inode *parent;

spin_lock(&dentry->d_lock);

parent = dentry->d_parent->d_inode;
blkno = OCFS2_I(parent)->ip_blkno;
generation = parent->i_generation;

fh[3] = cpu_to_le32((u32)(blkno >> 32));
fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff));
fh[5] = cpu_to_le32(generation);

spin_unlock(&dentry->d_lock);

len = 6;
type = 2;

mlog(0, "Encoding parent: blkno: %llu, generation: %u\n",
(unsigned long long)blkno, generation);
}

*max_len = len;

bail:
mlog_exit(type);
return type;
}

static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb,
struct fid *fid, int fh_len, int fh_type)
{
struct ocfs2_inode_handle handle;

if (fh_len < 3 || fh_type > 2)
return NULL;

handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32;
handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]);
handle.ih_generation = le32_to_cpu(fid->raw[2]);
return ocfs2_get_dentry(sb, &handle);
}

static struct dentry *ocfs2_fh_to_parent(struct super_block *sb,
struct fid *fid, int fh_len, int fh_type)
{
struct ocfs2_inode_handle parent;

if (fh_type != 2 || fh_len < 6)
return NULL;

parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32;
parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]);
parent.ih_generation = le32_to_cpu(fid->raw[5]);
return ocfs2_get_dentry(sb, &parent);
}

const struct export_operations ocfs2_export_ops = {
.encode_fh = ocfs2_encode_fh,
.fh_to_dentry = ocfs2_fh_to_dentry,
.fh_to_parent = ocfs2_fh_to_parent,
.get_parent = ocfs2_get_parent,
};
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