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TOMOYO Linux Cross Reference
Linux/fs/ocfs2/export.c

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  1 /* -*- 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 #include <cluster/masklog.h>
 30 
 31 #include "ocfs2.h"
 32 
 33 #include "alloc.h"
 34 #include "dir.h"
 35 #include "dlmglue.h"
 36 #include "dcache.h"
 37 #include "export.h"
 38 #include "inode.h"
 39 
 40 #include "buffer_head_io.h"
 41 #include "suballoc.h"
 42 #include "ocfs2_trace.h"
 43 
 44 struct ocfs2_inode_handle
 45 {
 46         u64 ih_blkno;
 47         u32 ih_generation;
 48 };
 49 
 50 static struct dentry *ocfs2_get_dentry(struct super_block *sb,
 51                 struct ocfs2_inode_handle *handle)
 52 {
 53         struct inode *inode;
 54         struct ocfs2_super *osb = OCFS2_SB(sb);
 55         u64 blkno = handle->ih_blkno;
 56         int status, set;
 57         struct dentry *result;
 58 
 59         trace_ocfs2_get_dentry_begin(sb, handle, (unsigned long long)blkno);
 60 
 61         if (blkno == 0) {
 62                 result = ERR_PTR(-ESTALE);
 63                 goto bail;
 64         }
 65 
 66         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;
 73 
 74         /*
 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         }
 83 
 84         status = ocfs2_test_inode_bit(osb, blkno, &set);
 85         trace_ocfs2_get_dentry_test_bit(status, 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                         status = -ESTALE;
 94                 } else
 95                         mlog(ML_ERROR, "test inode bit failed %d\n", status);
 96                 goto unlock_nfs_sync;
 97         }
 98 
 99         /* If the inode allocator bit is clear, this inode must be stale */
100         if (!set) {
101                 status = -ESTALE;
102                 goto unlock_nfs_sync;
103         }
104 
105         inode = ocfs2_iget(osb, blkno, 0, 0);
106 
107 unlock_nfs_sync:
108         ocfs2_nfs_sync_unlock(osb, 1);
109 
110 check_err:
111         if (status < 0) {
112                 if (status == -ESTALE) {
113                         trace_ocfs2_get_dentry_stale((unsigned long long)blkno,
114                                                      handle->ih_generation);
115                 }
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 
126 check_gen:
127         if (handle->ih_generation != inode->i_generation) {
128                 iput(inode);
129                 trace_ocfs2_get_dentry_generation((unsigned long long)blkno,
130                                                   handle->ih_generation,
131                                                   inode->i_generation);
132                 result = ERR_PTR(-ESTALE);
133                 goto bail;
134         }
135 
136         result = d_obtain_alias(inode);
137         if (IS_ERR(result))
138                 mlog_errno(PTR_ERR(result));
139 
140 bail:
141         trace_ocfs2_get_dentry_end(result);
142         return result;
143 }
144 
145 static struct dentry *ocfs2_get_parent(struct dentry *child)
146 {
147         int status;
148         u64 blkno;
149         struct dentry *parent;
150         struct inode *dir = child->d_inode;
151 
152         trace_ocfs2_get_parent(child, child->d_name.len, child->d_name.name,
153                                (unsigned long long)OCFS2_I(dir)->ip_blkno);
154 
155         status = ocfs2_inode_lock(dir, NULL, 0);
156         if (status < 0) {
157                 if (status != -ENOENT)
158                         mlog_errno(status);
159                 parent = ERR_PTR(status);
160                 goto bail;
161         }
162 
163         status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno);
164         if (status < 0) {
165                 parent = ERR_PTR(-ENOENT);
166                 goto bail_unlock;
167         }
168 
169         parent = d_obtain_alias(ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0));
170 
171 bail_unlock:
172         ocfs2_inode_unlock(dir, 0);
173 
174 bail:
175         trace_ocfs2_get_parent_end(parent);
176 
177         return parent;
178 }
179 
180 static int ocfs2_encode_fh(struct dentry *dentry, u32 *fh_in, int *max_len,
181                            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;
188         __le32 *fh = (__force __le32 *) fh_in;
189 
190         trace_ocfs2_encode_fh_begin(dentry, dentry->d_name.len,
191                                     dentry->d_name.name,
192                                     fh, len, connectable);
193 
194         if (connectable && (len < 6)) {
195                 *max_len = 6;
196                 type = 255;
197                 goto bail;
198         } else if (len < 3) {
199                 *max_len = 3;
200                 type = 255;
201                 goto bail;
202         }
203 
204         blkno = OCFS2_I(inode)->ip_blkno;
205         generation = inode->i_generation;
206 
207         trace_ocfs2_encode_fh_self((unsigned long long)blkno, generation);
208 
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 
232                 trace_ocfs2_encode_fh_parent((unsigned long long)blkno,
233                                              generation);
234         }
235 
236         *max_len = len;
237 
238 bail:
239         trace_ocfs2_encode_fh_type(type);
240         return type;
241 }
242 
243 static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb,
244                 struct fid *fid, int fh_len, int fh_type)
245 {
246         struct ocfs2_inode_handle handle;
247 
248         if (fh_len < 3 || fh_type > 2)
249                 return NULL;
250 
251         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 }
256 
257 static 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;
261 
262         if (fh_type != 2 || fh_len < 6)
263                 return NULL;
264 
265         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);
269 }
270 
271 const struct export_operations ocfs2_export_ops = {
272         .encode_fh      = ocfs2_encode_fh,
273         .fh_to_dentry   = ocfs2_fh_to_dentry,
274         .fh_to_parent   = ocfs2_fh_to_parent,
275         .get_parent     = ocfs2_get_parent,
276 };
277 

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