blob: 745db42528d5fd2f875a099177158f347fd361e7 [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
Mark Fashehccd979b2005-12-15 14:31:24 -080029#include <cluster/masklog.h>
30
31#include "ocfs2.h"
32
wengang wang6ca497a2009-03-06 21:29:10 +080033#include "alloc.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080034#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"
wengang wang6ca497a2009-03-06 21:29:10 +080041#include "suballoc.h"
Tao Ma781f2002011-02-24 13:50:19 +080042#include "ocfs2_trace.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
Tao Ma781f2002011-02-24 13:50:19 +080059 trace_ocfs2_get_dentry_begin(sb, handle, (unsigned long long)blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -080060
wengang wang6ca497a2009-03-06 21:29:10 +080061 if (blkno == 0) {
wengang wang6ca497a2009-03-06 21:29:10 +080062 result = ERR_PTR(-ESTALE);
63 goto bail;
Mark Fashehccd979b2005-12-15 14:31:24 -080064 }
65
wengang wang6ca497a2009-03-06 21:29:10 +080066 inode = ocfs2_ilookup(sb, blkno);
67 /*
68 * If the inode exists in memory, we only need to check it's
69 * generation number
70 */
71 if (inode)
72 goto check_gen;
Mark Fashehccd979b2005-12-15 14:31:24 -080073
wengang wang6ca497a2009-03-06 21:29:10 +080074 /*
75 * This will synchronize us against ocfs2_delete_inode() on
76 * all nodes
77 */
78 status = ocfs2_nfs_sync_lock(osb, 1);
79 if (status < 0) {
80 mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status);
81 goto check_err;
82 }
Mark Fashehccd979b2005-12-15 14:31:24 -080083
wengang wang6ca497a2009-03-06 21:29:10 +080084 status = ocfs2_test_inode_bit(osb, blkno, &set);
Tao Ma781f2002011-02-24 13:50:19 +080085 trace_ocfs2_get_dentry_test_bit(status, set);
wengang wang6ca497a2009-03-06 21:29:10 +080086 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 */
wengang wang6ca497a2009-03-06 21:29:10 +080093 status = -ESTALE;
Tao Ma781f2002011-02-24 13:50:19 +080094 } else
wengang wang6ca497a2009-03-06 21:29:10 +080095 mlog(ML_ERROR, "test inode bit failed %d\n", status);
wengang wang6ca497a2009-03-06 21:29:10 +080096 goto unlock_nfs_sync;
97 }
98
99 /* If the inode allocator bit is clear, this inode must be stale */
100 if (!set) {
wengang wang6ca497a2009-03-06 21:29:10 +0800101 status = -ESTALE;
102 goto unlock_nfs_sync;
103 }
104
105 inode = ocfs2_iget(osb, blkno, 0, 0);
106
107unlock_nfs_sync:
108 ocfs2_nfs_sync_unlock(osb, 1);
109
110check_err:
111 if (status < 0) {
112 if (status == -ESTALE) {
Tao Ma781f2002011-02-24 13:50:19 +0800113 trace_ocfs2_get_dentry_stale((unsigned long long)blkno,
114 handle->ih_generation);
wengang wang6ca497a2009-03-06 21:29:10 +0800115 }
116 result = ERR_PTR(status);
117 goto bail;
118 }
119
120 if (IS_ERR(inode)) {
121 mlog_errno(PTR_ERR(inode));
122 result = (void *)inode;
123 goto bail;
124 }
125
126check_gen:
Mark Fashehccd979b2005-12-15 14:31:24 -0800127 if (handle->ih_generation != inode->i_generation) {
128 iput(inode);
Tao Ma781f2002011-02-24 13:50:19 +0800129 trace_ocfs2_get_dentry_generation((unsigned long long)blkno,
130 handle->ih_generation,
131 inode->i_generation);
wengang wang6ca497a2009-03-06 21:29:10 +0800132 result = ERR_PTR(-ESTALE);
133 goto bail;
Mark Fashehccd979b2005-12-15 14:31:24 -0800134 }
135
Christoph Hellwig44003722008-08-11 15:49:04 +0200136 result = d_obtain_alias(inode);
Al Viroba871672010-12-18 12:10:00 -0500137 if (IS_ERR(result))
wengang wang6ca497a2009-03-06 21:29:10 +0800138 mlog_errno(PTR_ERR(result));
Mark Fashehccd979b2005-12-15 14:31:24 -0800139
wengang wang6ca497a2009-03-06 21:29:10 +0800140bail:
Tao Ma781f2002011-02-24 13:50:19 +0800141 trace_ocfs2_get_dentry_end(result);
Mark Fashehccd979b2005-12-15 14:31:24 -0800142 return result;
143}
144
145static struct dentry *ocfs2_get_parent(struct dentry *child)
146{
147 int status;
148 u64 blkno;
149 struct dentry *parent;
Mark Fashehccd979b2005-12-15 14:31:24 -0800150 struct inode *dir = child->d_inode;
Mark Fashehccd979b2005-12-15 14:31:24 -0800151
Tao Ma781f2002011-02-24 13:50:19 +0800152 trace_ocfs2_get_parent(child, child->d_name.len, child->d_name.name,
153 (unsigned long long)OCFS2_I(dir)->ip_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800154
Mark Fashehe63aecb62007-10-18 15:30:42 -0700155 status = ocfs2_inode_lock(dir, NULL, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800156 if (status < 0) {
157 if (status != -ENOENT)
158 mlog_errno(status);
159 parent = ERR_PTR(status);
160 goto bail;
161 }
162
Mark Fashehbe94d112007-09-11 15:22:06 -0700163 status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800164 if (status < 0) {
165 parent = ERR_PTR(-ENOENT);
166 goto bail_unlock;
167 }
168
Christoph Hellwig44003722008-08-11 15:49:04 +0200169 parent = d_obtain_alias(ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0));
Mark Fasheh379dfe92006-09-08 14:21:03 -0700170
Mark Fashehccd979b2005-12-15 14:31:24 -0800171bail_unlock:
Mark Fashehe63aecb62007-10-18 15:30:42 -0700172 ocfs2_inode_unlock(dir, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800173
Mark Fashehccd979b2005-12-15 14:31:24 -0800174bail:
Tao Ma781f2002011-02-24 13:50:19 +0800175 trace_ocfs2_get_parent_end(parent);
Mark Fashehccd979b2005-12-15 14:31:24 -0800176
177 return parent;
178}
179
Mark Fasheh1ca1a112007-04-27 16:01:25 -0700180static int ocfs2_encode_fh(struct dentry *dentry, u32 *fh_in, int *max_len,
Mark Fashehccd979b2005-12-15 14:31:24 -0800181 int connectable)
182{
183 struct inode *inode = dentry->d_inode;
184 int len = *max_len;
185 int type = 1;
186 u64 blkno;
187 u32 generation;
Mark Fasheh1ca1a112007-04-27 16:01:25 -0700188 __le32 *fh = (__force __le32 *) fh_in;
Mark Fashehccd979b2005-12-15 14:31:24 -0800189
Tao Ma781f2002011-02-24 13:50:19 +0800190 trace_ocfs2_encode_fh_begin(dentry, dentry->d_name.len,
191 dentry->d_name.name,
192 fh, len, connectable);
Mark Fashehccd979b2005-12-15 14:31:24 -0800193
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +0530194 if (connectable && (len < 6)) {
195 *max_len = 6;
196 type = 255;
197 goto bail;
198 } else if (len < 3) {
199 *max_len = 3;
Mark Fashehccd979b2005-12-15 14:31:24 -0800200 type = 255;
201 goto bail;
202 }
203
204 blkno = OCFS2_I(inode)->ip_blkno;
205 generation = inode->i_generation;
206
Tao Ma781f2002011-02-24 13:50:19 +0800207 trace_ocfs2_encode_fh_self((unsigned long long)blkno, generation);
Mark Fashehccd979b2005-12-15 14:31:24 -0800208
209 len = 3;
210 fh[0] = cpu_to_le32((u32)(blkno >> 32));
211 fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff));
212 fh[2] = cpu_to_le32(generation);
213
214 if (connectable && !S_ISDIR(inode->i_mode)) {
215 struct inode *parent;
216
217 spin_lock(&dentry->d_lock);
218
219 parent = dentry->d_parent->d_inode;
220 blkno = OCFS2_I(parent)->ip_blkno;
221 generation = parent->i_generation;
222
223 fh[3] = cpu_to_le32((u32)(blkno >> 32));
224 fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff));
225 fh[5] = cpu_to_le32(generation);
226
227 spin_unlock(&dentry->d_lock);
228
229 len = 6;
230 type = 2;
231
Tao Ma781f2002011-02-24 13:50:19 +0800232 trace_ocfs2_encode_fh_parent((unsigned long long)blkno,
233 generation);
Mark Fashehccd979b2005-12-15 14:31:24 -0800234 }
Sunil Mushran2bd63212010-01-25 16:57:38 -0800235
Mark Fashehccd979b2005-12-15 14:31:24 -0800236 *max_len = len;
237
238bail:
Tao Ma781f2002011-02-24 13:50:19 +0800239 trace_ocfs2_encode_fh_type(type);
Mark Fashehccd979b2005-12-15 14:31:24 -0800240 return type;
241}
242
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700243static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb,
244 struct fid *fid, int fh_len, int fh_type)
Mark Fashehccd979b2005-12-15 14:31:24 -0800245{
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700246 struct ocfs2_inode_handle handle;
Mark Fashehccd979b2005-12-15 14:31:24 -0800247
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700248 if (fh_len < 3 || fh_type > 2)
249 return NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800250
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700251 handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32;
252 handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]);
253 handle.ih_generation = le32_to_cpu(fid->raw[2]);
254 return ocfs2_get_dentry(sb, &handle);
255}
Mark Fashehccd979b2005-12-15 14:31:24 -0800256
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700257static struct dentry *ocfs2_fh_to_parent(struct super_block *sb,
258 struct fid *fid, int fh_len, int fh_type)
259{
260 struct ocfs2_inode_handle parent;
Mark Fashehccd979b2005-12-15 14:31:24 -0800261
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700262 if (fh_type != 2 || fh_len < 6)
263 return NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800264
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700265 parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32;
266 parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]);
267 parent.ih_generation = le32_to_cpu(fid->raw[5]);
268 return ocfs2_get_dentry(sb, &parent);
Mark Fashehccd979b2005-12-15 14:31:24 -0800269}
270
Christoph Hellwig39655162007-10-21 16:42:17 -0700271const struct export_operations ocfs2_export_ops = {
Mark Fashehccd979b2005-12-15 14:31:24 -0800272 .encode_fh = ocfs2_encode_fh,
Christoph Hellwig644f9ab2007-10-21 16:42:15 -0700273 .fh_to_dentry = ocfs2_fh_to_dentry,
274 .fh_to_parent = ocfs2_fh_to_parent,
Mark Fashehccd979b2005-12-15 14:31:24 -0800275 .get_parent = ocfs2_get_parent,
Mark Fashehccd979b2005-12-15 14:31:24 -0800276};