blob: 67527cebf21400fb7d86039dccbe566f2265b9b5 [file] [log] [blame]
Mark Fashehccd979b2005-12-15 14:31:24 -08001/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * export.c
5 *
6 * Functions to facilitate NFS exporting
7 *
8 * Copyright (C) 2002, 2005 Oracle. All rights reserved.
9 *
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.
14 *
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.
19 *
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.
24 */
25
26#include <linux/fs.h>
27#include <linux/types.h>
28
29#define MLOG_MASK_PREFIX ML_EXPORT
30#include <cluster/masklog.h>
31
32#include "ocfs2.h"
33
34#include "dir.h"
35#include "dlmglue.h"
Mark Fasheh379dfe92006-09-08 14:21:03 -070036#include "dcache.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080037#include "export.h"
38#include "inode.h"
39
40#include "buffer_head_io.h"
41
42struct ocfs2_inode_handle
43{
44 u64 ih_blkno;
45 u32 ih_generation;
46};
47
Christoph Hellwig644f9ab2007-10-21 16:42:15 -070048static struct dentry *ocfs2_get_dentry(struct super_block *sb,
49 struct ocfs2_inode_handle *handle)
Mark Fashehccd979b2005-12-15 14:31:24 -080050{
Mark Fashehccd979b2005-12-15 14:31:24 -080051 struct inode *inode;
52 struct dentry *result;
53
54 mlog_entry("(0x%p, 0x%p)\n", sb, handle);
55
56 if (handle->ih_blkno == 0) {
57 mlog_errno(-ESTALE);
58 return ERR_PTR(-ESTALE);
59 }
60
Jan Kara5fa06132008-01-11 00:11:45 +010061 inode = ocfs2_iget(OCFS2_SB(sb), handle->ih_blkno, 0, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -080062
Mark Fasheh6a1bd4a2007-01-03 17:06:59 -080063 if (IS_ERR(inode))
Mark Fashehccd979b2005-12-15 14:31:24 -080064 return (void *)inode;
Mark Fashehccd979b2005-12-15 14:31:24 -080065
66 if (handle->ih_generation != inode->i_generation) {
67 iput(inode);
Mark Fashehccd979b2005-12-15 14:31:24 -080068 return ERR_PTR(-ESTALE);
69 }
70
71 result = d_alloc_anon(inode);
72
73 if (!result) {
74 iput(inode);
75 mlog_errno(-ENOMEM);
76 return ERR_PTR(-ENOMEM);
77 }
Mark Fasheh379dfe92006-09-08 14:21:03 -070078 result->d_op = &ocfs2_dentry_ops;
Mark Fashehccd979b2005-12-15 14:31:24 -080079
80 mlog_exit_ptr(result);
81 return result;
82}
83
84static struct dentry *ocfs2_get_parent(struct dentry *child)
85{
86 int status;
87 u64 blkno;
88 struct dentry *parent;
89 struct inode *inode;
90 struct inode *dir = child->d_inode;
Mark Fashehccd979b2005-12-15 14:31:24 -080091
92 mlog_entry("(0x%p, '%.*s')\n", child,
93 child->d_name.len, child->d_name.name);
94
Mark Fashehb0697052006-03-03 10:24:33 -080095 mlog(0, "find parent of directory %llu\n",
96 (unsigned long long)OCFS2_I(dir)->ip_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -080097
Mark Fashehe63aecb62007-10-18 15:30:42 -070098 status = ocfs2_inode_lock(dir, NULL, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -080099 if (status < 0) {
100 if (status != -ENOENT)
101 mlog_errno(status);
102 parent = ERR_PTR(status);
103 goto bail;
104 }
105
Mark Fashehbe94d112007-09-11 15:22:06 -0700106 status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800107 if (status < 0) {
108 parent = ERR_PTR(-ENOENT);
109 goto bail_unlock;
110 }
111
Jan Kara5fa06132008-01-11 00:11:45 +0100112 inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800113 if (IS_ERR(inode)) {
Mark Fashehb0697052006-03-03 10:24:33 -0800114 mlog(ML_ERROR, "Unable to create inode %llu\n",
115 (unsigned long long)blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800116 parent = ERR_PTR(-EACCES);
117 goto bail_unlock;
118 }
119
120 parent = d_alloc_anon(inode);
121 if (!parent) {
122 iput(inode);
123 parent = ERR_PTR(-ENOMEM);
124 }
125
Mark Fasheh379dfe92006-09-08 14:21:03 -0700126 parent->d_op = &ocfs2_dentry_ops;
127
Mark Fashehccd979b2005-12-15 14:31:24 -0800128bail_unlock:
Mark Fashehe63aecb62007-10-18 15:30:42 -0700129 ocfs2_inode_unlock(dir, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800130
Mark Fashehccd979b2005-12-15 14:31:24 -0800131bail:
132 mlog_exit_ptr(parent);
133
134 return parent;
135}
136
Mark Fasheh1ca1a112007-04-27 16:01:25 -0700137static int ocfs2_encode_fh(struct dentry *dentry, u32 *fh_in, int *max_len,
Mark Fashehccd979b2005-12-15 14:31:24 -0800138 int connectable)
139{
140 struct inode *inode = dentry->d_inode;
141 int len = *max_len;
142 int type = 1;
143 u64 blkno;
144 u32 generation;
Mark Fasheh1ca1a112007-04-27 16:01:25 -0700145 __le32 *fh = (__force __le32 *) fh_in;
Mark Fashehccd979b2005-12-15 14:31:24 -0800146
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);
150
151 if (len < 3 || (connectable && len < 6)) {
152 mlog(ML_ERROR, "fh buffer is too small for encoding\n");
153 type = 255;
154 goto bail;
155 }
156
157 blkno = OCFS2_I(inode)->ip_blkno;
158 generation = inode->i_generation;
159
Mark Fashehb0697052006-03-03 10:24:33 -0800160 mlog(0, "Encoding fh: blkno: %llu, generation: %u\n",
161 (unsigned long long)blkno, generation);
Mark Fashehccd979b2005-12-15 14:31:24 -0800162
163 len = 3;
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);
167
168 if (connectable && !S_ISDIR(inode->i_mode)) {
169 struct inode *parent;
170
171 spin_lock(&dentry->d_lock);
172
173 parent = dentry->d_parent->d_inode;
174 blkno = OCFS2_I(parent)->ip_blkno;
175 generation = parent->i_generation;
176
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);
180
181 spin_unlock(&dentry->d_lock);
182
183 len = 6;
184 type = 2;
185
Mark Fashehb0697052006-03-03 10:24:33 -0800186 mlog(0, "Encoding parent: blkno: %llu, generation: %u\n",
187 (unsigned long long)blkno, generation);
Mark Fashehccd979b2005-12-15 14:31:24 -0800188 }
189
190 *max_len = len;
191
192bail:
193 mlog_exit(type);
194 return type;
195}
196
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700197static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb,
198 struct fid *fid, int fh_len, int fh_type)
Mark Fashehccd979b2005-12-15 14:31:24 -0800199{
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700200 struct ocfs2_inode_handle handle;
Mark Fashehccd979b2005-12-15 14:31:24 -0800201
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700202 if (fh_len < 3 || fh_type > 2)
203 return NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800204
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700205 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);
209}
Mark Fashehccd979b2005-12-15 14:31:24 -0800210
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700211static struct dentry *ocfs2_fh_to_parent(struct super_block *sb,
212 struct fid *fid, int fh_len, int fh_type)
213{
214 struct ocfs2_inode_handle parent;
Mark Fashehccd979b2005-12-15 14:31:24 -0800215
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700216 if (fh_type != 2 || fh_len < 6)
217 return NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800218
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700219 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);
Mark Fashehccd979b2005-12-15 14:31:24 -0800223}
224
Christoph Hellwig39655162007-10-21 16:42:17 -0700225const struct export_operations ocfs2_export_ops = {
Mark Fashehccd979b2005-12-15 14:31:24 -0800226 .encode_fh = ocfs2_encode_fh,
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700227 .fh_to_dentry = ocfs2_fh_to_dentry,
228 .fh_to_parent = ocfs2_fh_to_parent,
Mark Fashehccd979b2005-12-15 14:31:24 -0800229 .get_parent = ocfs2_get_parent,
Mark Fashehccd979b2005-12-15 14:31:24 -0800230};