2005-12-15 15:31:24 -07:00
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/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* export.c
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*
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* Functions to facilitate NFS exporting
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*
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* Copyright (C) 2002, 2005 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/fs.h>
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#include <linux/types.h>
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#define MLOG_MASK_PREFIX ML_EXPORT
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "dir.h"
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#include "dlmglue.h"
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2006-09-08 15:21:03 -06:00
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#include "dcache.h"
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2005-12-15 15:31:24 -07:00
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#include "export.h"
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#include "inode.h"
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#include "buffer_head_io.h"
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struct ocfs2_inode_handle
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{
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u64 ih_blkno;
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u32 ih_generation;
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};
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2007-10-21 17:42:15 -06:00
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static struct dentry *ocfs2_get_dentry(struct super_block *sb,
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struct ocfs2_inode_handle *handle)
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2005-12-15 15:31:24 -07:00
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{
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struct inode *inode;
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struct dentry *result;
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mlog_entry("(0x%p, 0x%p)\n", sb, handle);
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if (handle->ih_blkno == 0) {
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mlog_errno(-ESTALE);
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return ERR_PTR(-ESTALE);
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}
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2008-01-10 16:11:45 -07:00
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inode = ocfs2_iget(OCFS2_SB(sb), handle->ih_blkno, 0, 0);
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2005-12-15 15:31:24 -07:00
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2007-01-03 18:06:59 -07:00
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if (IS_ERR(inode))
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2005-12-15 15:31:24 -07:00
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return (void *)inode;
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if (handle->ih_generation != inode->i_generation) {
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iput(inode);
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return ERR_PTR(-ESTALE);
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}
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result = d_alloc_anon(inode);
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if (!result) {
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iput(inode);
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mlog_errno(-ENOMEM);
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return ERR_PTR(-ENOMEM);
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}
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2006-09-08 15:21:03 -06:00
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result->d_op = &ocfs2_dentry_ops;
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2005-12-15 15:31:24 -07:00
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mlog_exit_ptr(result);
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return result;
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}
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static struct dentry *ocfs2_get_parent(struct dentry *child)
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{
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int status;
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u64 blkno;
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struct dentry *parent;
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struct inode *inode;
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struct inode *dir = child->d_inode;
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mlog_entry("(0x%p, '%.*s')\n", child,
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child->d_name.len, child->d_name.name);
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2006-03-03 11:24:33 -07:00
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mlog(0, "find parent of directory %llu\n",
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(unsigned long long)OCFS2_I(dir)->ip_blkno);
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2005-12-15 15:31:24 -07:00
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2007-10-18 16:30:42 -06:00
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status = ocfs2_inode_lock(dir, NULL, 0);
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2005-12-15 15:31:24 -07:00
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if (status < 0) {
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if (status != -ENOENT)
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mlog_errno(status);
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parent = ERR_PTR(status);
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goto bail;
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}
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2007-09-11 16:22:06 -06:00
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status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno);
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2005-12-15 15:31:24 -07:00
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if (status < 0) {
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parent = ERR_PTR(-ENOENT);
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goto bail_unlock;
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}
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2008-01-10 16:11:45 -07:00
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inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0);
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2005-12-15 15:31:24 -07:00
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if (IS_ERR(inode)) {
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2006-03-03 11:24:33 -07:00
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mlog(ML_ERROR, "Unable to create inode %llu\n",
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(unsigned long long)blkno);
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2005-12-15 15:31:24 -07:00
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parent = ERR_PTR(-EACCES);
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goto bail_unlock;
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}
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parent = d_alloc_anon(inode);
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if (!parent) {
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iput(inode);
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parent = ERR_PTR(-ENOMEM);
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}
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2006-09-08 15:21:03 -06:00
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parent->d_op = &ocfs2_dentry_ops;
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2005-12-15 15:31:24 -07:00
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bail_unlock:
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2007-10-18 16:30:42 -06:00
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ocfs2_inode_unlock(dir, 0);
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2005-12-15 15:31:24 -07:00
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bail:
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mlog_exit_ptr(parent);
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return parent;
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}
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2007-04-27 17:01:25 -06:00
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static int ocfs2_encode_fh(struct dentry *dentry, u32 *fh_in, int *max_len,
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2005-12-15 15:31:24 -07:00
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int connectable)
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{
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struct inode *inode = dentry->d_inode;
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int len = *max_len;
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int type = 1;
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u64 blkno;
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u32 generation;
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2007-04-27 17:01:25 -06:00
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__le32 *fh = (__force __le32 *) fh_in;
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2005-12-15 15:31:24 -07:00
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mlog_entry("(0x%p, '%.*s', 0x%p, %d, %d)\n", dentry,
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dentry->d_name.len, dentry->d_name.name,
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fh, len, connectable);
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if (len < 3 || (connectable && len < 6)) {
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mlog(ML_ERROR, "fh buffer is too small for encoding\n");
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type = 255;
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goto bail;
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}
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blkno = OCFS2_I(inode)->ip_blkno;
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generation = inode->i_generation;
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2006-03-03 11:24:33 -07:00
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mlog(0, "Encoding fh: blkno: %llu, generation: %u\n",
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(unsigned long long)blkno, generation);
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2005-12-15 15:31:24 -07:00
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len = 3;
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fh[0] = cpu_to_le32((u32)(blkno >> 32));
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fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff));
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fh[2] = cpu_to_le32(generation);
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if (connectable && !S_ISDIR(inode->i_mode)) {
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struct inode *parent;
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spin_lock(&dentry->d_lock);
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parent = dentry->d_parent->d_inode;
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blkno = OCFS2_I(parent)->ip_blkno;
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generation = parent->i_generation;
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fh[3] = cpu_to_le32((u32)(blkno >> 32));
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fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff));
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fh[5] = cpu_to_le32(generation);
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spin_unlock(&dentry->d_lock);
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len = 6;
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type = 2;
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2006-03-03 11:24:33 -07:00
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mlog(0, "Encoding parent: blkno: %llu, generation: %u\n",
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(unsigned long long)blkno, generation);
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2005-12-15 15:31:24 -07:00
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}
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*max_len = len;
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bail:
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mlog_exit(type);
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return type;
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}
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2007-10-21 17:42:15 -06:00
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static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb,
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struct fid *fid, int fh_len, int fh_type)
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2005-12-15 15:31:24 -07:00
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{
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2007-10-21 17:42:15 -06:00
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struct ocfs2_inode_handle handle;
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2005-12-15 15:31:24 -07:00
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2007-10-21 17:42:15 -06:00
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if (fh_len < 3 || fh_type > 2)
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return NULL;
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2005-12-15 15:31:24 -07:00
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2007-10-21 17:42:15 -06:00
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handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32;
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handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]);
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handle.ih_generation = le32_to_cpu(fid->raw[2]);
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return ocfs2_get_dentry(sb, &handle);
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}
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2005-12-15 15:31:24 -07:00
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2007-10-21 17:42:15 -06:00
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static struct dentry *ocfs2_fh_to_parent(struct super_block *sb,
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struct fid *fid, int fh_len, int fh_type)
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{
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struct ocfs2_inode_handle parent;
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2005-12-15 15:31:24 -07:00
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2007-10-21 17:42:15 -06:00
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if (fh_type != 2 || fh_len < 6)
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return NULL;
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2005-12-15 15:31:24 -07:00
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2007-10-21 17:42:15 -06:00
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parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32;
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parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]);
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parent.ih_generation = le32_to_cpu(fid->raw[5]);
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return ocfs2_get_dentry(sb, &parent);
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2005-12-15 15:31:24 -07:00
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}
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2007-10-21 17:42:17 -06:00
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const struct export_operations ocfs2_export_ops = {
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2005-12-15 15:31:24 -07:00
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.encode_fh = ocfs2_encode_fh,
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2007-10-21 17:42:15 -06:00
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.fh_to_dentry = ocfs2_fh_to_dentry,
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.fh_to_parent = ocfs2_fh_to_parent,
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2005-12-15 15:31:24 -07:00
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.get_parent = ocfs2_get_parent,
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};
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