1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
6 * Functions to facilitate NFS exporting
8 * Copyright (C) 2002, 2005 Oracle. All rights reserved.
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
27 #include <linux/types.h>
29 #define MLOG_MASK_PREFIX ML_EXPORT
30 #include <cluster/masklog.h>
40 #include "buffer_head_io.h"
42 struct ocfs2_inode_handle
48 static struct dentry *ocfs2_get_dentry(struct super_block *sb,
49 struct ocfs2_inode_handle *handle)
52 struct dentry *result;
54 mlog_entry("(0x%p, 0x%p)\n", sb, handle);
56 if (handle->ih_blkno == 0) {
58 return ERR_PTR(-ESTALE);
61 inode = ocfs2_iget(OCFS2_SB(sb), handle->ih_blkno, 0, 0);
66 if (handle->ih_generation != inode->i_generation) {
68 return ERR_PTR(-ESTALE);
71 result = d_alloc_anon(inode);
76 return ERR_PTR(-ENOMEM);
78 result->d_op = &ocfs2_dentry_ops;
80 mlog_exit_ptr(result);
84 static struct dentry *ocfs2_get_parent(struct dentry *child)
88 struct dentry *parent;
90 struct inode *dir = child->d_inode;
92 mlog_entry("(0x%p, '%.*s')\n", child,
93 child->d_name.len, child->d_name.name);
95 mlog(0, "find parent of directory %llu\n",
96 (unsigned long long)OCFS2_I(dir)->ip_blkno);
98 status = ocfs2_inode_lock(dir, NULL, 0);
100 if (status != -ENOENT)
102 parent = ERR_PTR(status);
106 status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno);
108 parent = ERR_PTR(-ENOENT);
112 inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0);
114 mlog(ML_ERROR, "Unable to create inode %llu\n",
115 (unsigned long long)blkno);
116 parent = ERR_PTR(-EACCES);
120 parent = d_alloc_anon(inode);
123 parent = ERR_PTR(-ENOMEM);
126 parent->d_op = &ocfs2_dentry_ops;
129 ocfs2_inode_unlock(dir, 0);
132 mlog_exit_ptr(parent);
137 static int ocfs2_encode_fh(struct dentry *dentry, u32 *fh_in, int *max_len,
140 struct inode *inode = dentry->d_inode;
145 __le32 *fh = (__force __le32 *) fh_in;
147 mlog_entry("(0x%p, '%.*s', 0x%p, %d, %d)\n", dentry,
148 dentry->d_name.len, dentry->d_name.name,
149 fh, len, connectable);
151 if (len < 3 || (connectable && len < 6)) {
152 mlog(ML_ERROR, "fh buffer is too small for encoding\n");
157 blkno = OCFS2_I(inode)->ip_blkno;
158 generation = inode->i_generation;
160 mlog(0, "Encoding fh: blkno: %llu, generation: %u\n",
161 (unsigned long long)blkno, generation);
164 fh[0] = cpu_to_le32((u32)(blkno >> 32));
165 fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff));
166 fh[2] = cpu_to_le32(generation);
168 if (connectable && !S_ISDIR(inode->i_mode)) {
169 struct inode *parent;
171 spin_lock(&dentry->d_lock);
173 parent = dentry->d_parent->d_inode;
174 blkno = OCFS2_I(parent)->ip_blkno;
175 generation = parent->i_generation;
177 fh[3] = cpu_to_le32((u32)(blkno >> 32));
178 fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff));
179 fh[5] = cpu_to_le32(generation);
181 spin_unlock(&dentry->d_lock);
186 mlog(0, "Encoding parent: blkno: %llu, generation: %u\n",
187 (unsigned long long)blkno, generation);
197 static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb,
198 struct fid *fid, int fh_len, int fh_type)
200 struct ocfs2_inode_handle handle;
202 if (fh_len < 3 || fh_type > 2)
205 handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32;
206 handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]);
207 handle.ih_generation = le32_to_cpu(fid->raw[2]);
208 return ocfs2_get_dentry(sb, &handle);
211 static struct dentry *ocfs2_fh_to_parent(struct super_block *sb,
212 struct fid *fid, int fh_len, int fh_type)
214 struct ocfs2_inode_handle parent;
216 if (fh_type != 2 || fh_len < 6)
219 parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32;
220 parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]);
221 parent.ih_generation = le32_to_cpu(fid->raw[5]);
222 return ocfs2_get_dentry(sb, &parent);
225 const struct export_operations ocfs2_export_ops = {
226 .encode_fh = ocfs2_encode_fh,
227 .fh_to_dentry = ocfs2_fh_to_dentry,
228 .fh_to_parent = ocfs2_fh_to_parent,
229 .get_parent = ocfs2_get_parent,