blob: 19ad145d2af3171aaab2be2580dc89549ac37eeb [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
wengang wang6ca497a2009-03-06 21:29:10 +080034#include "alloc.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080035#include "dir.h"
36#include "dlmglue.h"
Mark Fasheh379dfe92006-09-08 14:21:03 -070037#include "dcache.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080038#include "export.h"
39#include "inode.h"
40
41#include "buffer_head_io.h"
wengang wang6ca497a2009-03-06 21:29:10 +080042#include "suballoc.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080043
44struct ocfs2_inode_handle
45{
46 u64 ih_blkno;
47 u32 ih_generation;
48};
49
Christoph Hellwig644f9ab2007-10-21 16:42:15 -070050static struct dentry *ocfs2_get_dentry(struct super_block *sb,
51 struct ocfs2_inode_handle *handle)
Mark Fashehccd979b2005-12-15 14:31:24 -080052{
Mark Fashehccd979b2005-12-15 14:31:24 -080053 struct inode *inode;
wengang wang6ca497a2009-03-06 21:29:10 +080054 struct ocfs2_super *osb = OCFS2_SB(sb);
55 u64 blkno = handle->ih_blkno;
56 int status, set;
Mark Fashehccd979b2005-12-15 14:31:24 -080057 struct dentry *result;
58
59 mlog_entry("(0x%p, 0x%p)\n", sb, handle);
60
wengang wang6ca497a2009-03-06 21:29:10 +080061 if (blkno == 0) {
62 mlog(0, "nfs wants inode with blkno: 0\n");
63 result = ERR_PTR(-ESTALE);
64 goto bail;
Mark Fashehccd979b2005-12-15 14:31:24 -080065 }
66
wengang wang6ca497a2009-03-06 21:29:10 +080067 inode = ocfs2_ilookup(sb, blkno);
68 /*
69 * If the inode exists in memory, we only need to check it's
70 * generation number
71 */
72 if (inode)
73 goto check_gen;
Mark Fashehccd979b2005-12-15 14:31:24 -080074
wengang wang6ca497a2009-03-06 21:29:10 +080075 /*
76 * This will synchronize us against ocfs2_delete_inode() on
77 * all nodes
78 */
79 status = ocfs2_nfs_sync_lock(osb, 1);
80 if (status < 0) {
81 mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status);
82 goto check_err;
83 }
Mark Fashehccd979b2005-12-15 14:31:24 -080084
wengang wang6ca497a2009-03-06 21:29:10 +080085 status = ocfs2_test_inode_bit(osb, blkno, &set);
86 if (status < 0) {
87 if (status == -EINVAL) {
88 /*
89 * The blkno NFS gave us doesn't even show up
90 * as an inode, we return -ESTALE to be
91 * nice
92 */
93 mlog(0, "test inode bit failed %d\n", status);
94 status = -ESTALE;
95 } else {
96 mlog(ML_ERROR, "test inode bit failed %d\n", status);
97 }
98 goto unlock_nfs_sync;
99 }
100
101 /* If the inode allocator bit is clear, this inode must be stale */
102 if (!set) {
Joel Becker5b09b502009-04-21 16:31:20 -0700103 mlog(0, "inode %llu suballoc bit is clear\n",
104 (unsigned long long)blkno);
wengang wang6ca497a2009-03-06 21:29:10 +0800105 status = -ESTALE;
106 goto unlock_nfs_sync;
107 }
108
109 inode = ocfs2_iget(osb, blkno, 0, 0);
110
111unlock_nfs_sync:
112 ocfs2_nfs_sync_unlock(osb, 1);
113
114check_err:
115 if (status < 0) {
116 if (status == -ESTALE) {
117 mlog(0, "stale inode ino: %llu generation: %u\n",
Joel Becker5b09b502009-04-21 16:31:20 -0700118 (unsigned long long)blkno, handle->ih_generation);
wengang wang6ca497a2009-03-06 21:29:10 +0800119 }
120 result = ERR_PTR(status);
121 goto bail;
122 }
123
124 if (IS_ERR(inode)) {
125 mlog_errno(PTR_ERR(inode));
126 result = (void *)inode;
127 goto bail;
128 }
129
130check_gen:
Mark Fashehccd979b2005-12-15 14:31:24 -0800131 if (handle->ih_generation != inode->i_generation) {
132 iput(inode);
Joel Becker5b09b502009-04-21 16:31:20 -0700133 mlog(0, "stale inode ino: %llu generation: %u\n",
134 (unsigned long long)blkno, handle->ih_generation);
wengang wang6ca497a2009-03-06 21:29:10 +0800135 result = ERR_PTR(-ESTALE);
136 goto bail;
Mark Fashehccd979b2005-12-15 14:31:24 -0800137 }
138
Christoph Hellwig44003722008-08-11 15:49:04 +0200139 result = d_obtain_alias(inode);
140 if (!IS_ERR(result))
141 result->d_op = &ocfs2_dentry_ops;
wengang wang6ca497a2009-03-06 21:29:10 +0800142 else
143 mlog_errno(PTR_ERR(result));
Mark Fashehccd979b2005-12-15 14:31:24 -0800144
wengang wang6ca497a2009-03-06 21:29:10 +0800145bail:
Mark Fashehccd979b2005-12-15 14:31:24 -0800146 mlog_exit_ptr(result);
147 return result;
148}
149
150static struct dentry *ocfs2_get_parent(struct dentry *child)
151{
152 int status;
153 u64 blkno;
154 struct dentry *parent;
Mark Fashehccd979b2005-12-15 14:31:24 -0800155 struct inode *dir = child->d_inode;
Mark Fashehccd979b2005-12-15 14:31:24 -0800156
157 mlog_entry("(0x%p, '%.*s')\n", child,
158 child->d_name.len, child->d_name.name);
159
Mark Fashehb06970532006-03-03 10:24:33 -0800160 mlog(0, "find parent of directory %llu\n",
161 (unsigned long long)OCFS2_I(dir)->ip_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800162
Mark Fashehe63aecb62007-10-18 15:30:42 -0700163 status = ocfs2_inode_lock(dir, NULL, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800164 if (status < 0) {
165 if (status != -ENOENT)
166 mlog_errno(status);
167 parent = ERR_PTR(status);
168 goto bail;
169 }
170
Mark Fashehbe94d112007-09-11 15:22:06 -0700171 status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800172 if (status < 0) {
173 parent = ERR_PTR(-ENOENT);
174 goto bail_unlock;
175 }
176
Christoph Hellwig44003722008-08-11 15:49:04 +0200177 parent = d_obtain_alias(ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0));
178 if (!IS_ERR(parent))
179 parent->d_op = &ocfs2_dentry_ops;
Mark Fasheh379dfe92006-09-08 14:21:03 -0700180
Mark Fashehccd979b2005-12-15 14:31:24 -0800181bail_unlock:
Mark Fashehe63aecb62007-10-18 15:30:42 -0700182 ocfs2_inode_unlock(dir, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800183
Mark Fashehccd979b2005-12-15 14:31:24 -0800184bail:
185 mlog_exit_ptr(parent);
186
187 return parent;
188}
189
Mark Fasheh1ca1a112007-04-27 16:01:25 -0700190static int ocfs2_encode_fh(struct dentry *dentry, u32 *fh_in, int *max_len,
Mark Fashehccd979b2005-12-15 14:31:24 -0800191 int connectable)
192{
193 struct inode *inode = dentry->d_inode;
194 int len = *max_len;
195 int type = 1;
196 u64 blkno;
197 u32 generation;
Mark Fasheh1ca1a112007-04-27 16:01:25 -0700198 __le32 *fh = (__force __le32 *) fh_in;
Mark Fashehccd979b2005-12-15 14:31:24 -0800199
200 mlog_entry("(0x%p, '%.*s', 0x%p, %d, %d)\n", dentry,
201 dentry->d_name.len, dentry->d_name.name,
202 fh, len, connectable);
203
204 if (len < 3 || (connectable && len < 6)) {
205 mlog(ML_ERROR, "fh buffer is too small for encoding\n");
206 type = 255;
207 goto bail;
208 }
209
210 blkno = OCFS2_I(inode)->ip_blkno;
211 generation = inode->i_generation;
212
Mark Fashehb06970532006-03-03 10:24:33 -0800213 mlog(0, "Encoding fh: blkno: %llu, generation: %u\n",
214 (unsigned long long)blkno, generation);
Mark Fashehccd979b2005-12-15 14:31:24 -0800215
216 len = 3;
217 fh[0] = cpu_to_le32((u32)(blkno >> 32));
218 fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff));
219 fh[2] = cpu_to_le32(generation);
220
221 if (connectable && !S_ISDIR(inode->i_mode)) {
222 struct inode *parent;
223
224 spin_lock(&dentry->d_lock);
225
226 parent = dentry->d_parent->d_inode;
227 blkno = OCFS2_I(parent)->ip_blkno;
228 generation = parent->i_generation;
229
230 fh[3] = cpu_to_le32((u32)(blkno >> 32));
231 fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff));
232 fh[5] = cpu_to_le32(generation);
233
234 spin_unlock(&dentry->d_lock);
235
236 len = 6;
237 type = 2;
238
Mark Fashehb06970532006-03-03 10:24:33 -0800239 mlog(0, "Encoding parent: blkno: %llu, generation: %u\n",
240 (unsigned long long)blkno, generation);
Mark Fashehccd979b2005-12-15 14:31:24 -0800241 }
Sunil Mushran2bd63212010-01-25 16:57:38 -0800242
Mark Fashehccd979b2005-12-15 14:31:24 -0800243 *max_len = len;
244
245bail:
246 mlog_exit(type);
247 return type;
248}
249
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700250static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb,
251 struct fid *fid, int fh_len, int fh_type)
Mark Fashehccd979b2005-12-15 14:31:24 -0800252{
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700253 struct ocfs2_inode_handle handle;
Mark Fashehccd979b2005-12-15 14:31:24 -0800254
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700255 if (fh_len < 3 || fh_type > 2)
256 return NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800257
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700258 handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32;
259 handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]);
260 handle.ih_generation = le32_to_cpu(fid->raw[2]);
261 return ocfs2_get_dentry(sb, &handle);
262}
Mark Fashehccd979b2005-12-15 14:31:24 -0800263
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700264static struct dentry *ocfs2_fh_to_parent(struct super_block *sb,
265 struct fid *fid, int fh_len, int fh_type)
266{
267 struct ocfs2_inode_handle parent;
Mark Fashehccd979b2005-12-15 14:31:24 -0800268
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700269 if (fh_type != 2 || fh_len < 6)
270 return NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800271
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700272 parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32;
273 parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]);
274 parent.ih_generation = le32_to_cpu(fid->raw[5]);
275 return ocfs2_get_dentry(sb, &parent);
Mark Fashehccd979b2005-12-15 14:31:24 -0800276}
277
Christoph Hellwig39655162007-10-21 16:42:17 -0700278const struct export_operations ocfs2_export_ops = {
Mark Fashehccd979b2005-12-15 14:31:24 -0800279 .encode_fh = ocfs2_encode_fh,
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700280 .fh_to_dentry = ocfs2_fh_to_dentry,
281 .fh_to_parent = ocfs2_fh_to_parent,
Mark Fashehccd979b2005-12-15 14:31:24 -0800282 .get_parent = ocfs2_get_parent,
Mark Fashehccd979b2005-12-15 14:31:24 -0800283};