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Linux/fs/ocfs2/export.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /* -*- mode: c; c-basic-offset: 8; -*-
  3  * vim: noexpandtab sw=8 ts=8 sts=0:
  4  *
  5  * export.c
  6  *
  7  * Functions to facilitate NFS exporting
  8  *
  9  * Copyright (C) 2002, 2005 Oracle.  All rights reserved.
 10  */
 11 
 12 #include <linux/fs.h>
 13 #include <linux/types.h>
 14 
 15 #include <cluster/masklog.h>
 16 
 17 #include "ocfs2.h"
 18 
 19 #include "alloc.h"
 20 #include "dir.h"
 21 #include "dlmglue.h"
 22 #include "dcache.h"
 23 #include "export.h"
 24 #include "inode.h"
 25 
 26 #include "buffer_head_io.h"
 27 #include "suballoc.h"
 28 #include "ocfs2_trace.h"
 29 
 30 struct ocfs2_inode_handle
 31 {
 32         u64 ih_blkno;
 33         u32 ih_generation;
 34 };
 35 
 36 static struct dentry *ocfs2_get_dentry(struct super_block *sb,
 37                 struct ocfs2_inode_handle *handle)
 38 {
 39         struct inode *inode;
 40         struct ocfs2_super *osb = OCFS2_SB(sb);
 41         u64 blkno = handle->ih_blkno;
 42         int status, set;
 43         struct dentry *result;
 44 
 45         trace_ocfs2_get_dentry_begin(sb, handle, (unsigned long long)blkno);
 46 
 47         if (blkno == 0) {
 48                 result = ERR_PTR(-ESTALE);
 49                 goto bail;
 50         }
 51 
 52         inode = ocfs2_ilookup(sb, blkno);
 53         /*
 54          * If the inode exists in memory, we only need to check it's
 55          * generation number
 56          */
 57         if (inode)
 58                 goto check_gen;
 59 
 60         /*
 61          * This will synchronize us against ocfs2_delete_inode() on
 62          * all nodes
 63          */
 64         status = ocfs2_nfs_sync_lock(osb, 1);
 65         if (status < 0) {
 66                 mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status);
 67                 goto check_err;
 68         }
 69 
 70         status = ocfs2_test_inode_bit(osb, blkno, &set);
 71         if (status < 0) {
 72                 if (status == -EINVAL) {
 73                         /*
 74                          * The blkno NFS gave us doesn't even show up
 75                          * as an inode, we return -ESTALE to be
 76                          * nice
 77                          */
 78                         status = -ESTALE;
 79                 } else
 80                         mlog(ML_ERROR, "test inode bit failed %d\n", status);
 81                 goto unlock_nfs_sync;
 82         }
 83 
 84         trace_ocfs2_get_dentry_test_bit(status, set);
 85         /* If the inode allocator bit is clear, this inode must be stale */
 86         if (!set) {
 87                 status = -ESTALE;
 88                 goto unlock_nfs_sync;
 89         }
 90 
 91         inode = ocfs2_iget(osb, blkno, 0, 0);
 92 
 93 unlock_nfs_sync:
 94         ocfs2_nfs_sync_unlock(osb, 1);
 95 
 96 check_err:
 97         if (status < 0) {
 98                 if (status == -ESTALE) {
 99                         trace_ocfs2_get_dentry_stale((unsigned long long)blkno,
100                                                      handle->ih_generation);
101                 }
102                 result = ERR_PTR(status);
103                 goto bail;
104         }
105 
106         if (IS_ERR(inode)) {
107                 mlog_errno(PTR_ERR(inode));
108                 result = ERR_CAST(inode);
109                 goto bail;
110         }
111 
112 check_gen:
113         if (handle->ih_generation != inode->i_generation) {
114                 trace_ocfs2_get_dentry_generation((unsigned long long)blkno,
115                                                   handle->ih_generation,
116                                                   inode->i_generation);
117                 iput(inode);
118                 result = ERR_PTR(-ESTALE);
119                 goto bail;
120         }
121 
122         result = d_obtain_alias(inode);
123         if (IS_ERR(result))
124                 mlog_errno(PTR_ERR(result));
125 
126 bail:
127         trace_ocfs2_get_dentry_end(result);
128         return result;
129 }
130 
131 static struct dentry *ocfs2_get_parent(struct dentry *child)
132 {
133         int status;
134         u64 blkno;
135         struct dentry *parent;
136         struct inode *dir = d_inode(child);
137         int set;
138 
139         trace_ocfs2_get_parent(child, child->d_name.len, child->d_name.name,
140                                (unsigned long long)OCFS2_I(dir)->ip_blkno);
141 
142         status = ocfs2_nfs_sync_lock(OCFS2_SB(dir->i_sb), 1);
143         if (status < 0) {
144                 mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status);
145                 parent = ERR_PTR(status);
146                 goto bail;
147         }
148 
149         status = ocfs2_inode_lock(dir, NULL, 0);
150         if (status < 0) {
151                 if (status != -ENOENT)
152                         mlog_errno(status);
153                 parent = ERR_PTR(status);
154                 goto unlock_nfs_sync;
155         }
156 
157         status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno);
158         if (status < 0) {
159                 parent = ERR_PTR(-ENOENT);
160                 goto bail_unlock;
161         }
162 
163         status = ocfs2_test_inode_bit(OCFS2_SB(dir->i_sb), blkno, &set);
164         if (status < 0) {
165                 if (status == -EINVAL) {
166                         status = -ESTALE;
167                 } else
168                         mlog(ML_ERROR, "test inode bit failed %d\n", status);
169                 parent = ERR_PTR(status);
170                 goto bail_unlock;
171         }
172 
173         trace_ocfs2_get_dentry_test_bit(status, set);
174         if (!set) {
175                 status = -ESTALE;
176                 parent = ERR_PTR(status);
177                 goto bail_unlock;
178         }
179 
180         parent = d_obtain_alias(ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0));
181 
182 bail_unlock:
183         ocfs2_inode_unlock(dir, 0);
184 
185 unlock_nfs_sync:
186         ocfs2_nfs_sync_unlock(OCFS2_SB(dir->i_sb), 1);
187 
188 bail:
189         trace_ocfs2_get_parent_end(parent);
190 
191         return parent;
192 }
193 
194 static int ocfs2_encode_fh(struct inode *inode, u32 *fh_in, int *max_len,
195                            struct inode *parent)
196 {
197         int len = *max_len;
198         int type = 1;
199         u64 blkno;
200         u32 generation;
201         __le32 *fh = (__force __le32 *) fh_in;
202 
203 #ifdef TRACE_HOOKS_ARE_NOT_BRAINDEAD_IN_YOUR_OPINION
204 #error "You go ahead and fix that mess, then.  Somehow"
205         trace_ocfs2_encode_fh_begin(dentry, dentry->d_name.len,
206                                     dentry->d_name.name,
207                                     fh, len, connectable);
208 #endif
209 
210         if (parent && (len < 6)) {
211                 *max_len = 6;
212                 type = FILEID_INVALID;
213                 goto bail;
214         } else if (len < 3) {
215                 *max_len = 3;
216                 type = FILEID_INVALID;
217                 goto bail;
218         }
219 
220         blkno = OCFS2_I(inode)->ip_blkno;
221         generation = inode->i_generation;
222 
223         trace_ocfs2_encode_fh_self((unsigned long long)blkno, generation);
224 
225         len = 3;
226         fh[0] = cpu_to_le32((u32)(blkno >> 32));
227         fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff));
228         fh[2] = cpu_to_le32(generation);
229 
230         if (parent) {
231                 blkno = OCFS2_I(parent)->ip_blkno;
232                 generation = parent->i_generation;
233 
234                 fh[3] = cpu_to_le32((u32)(blkno >> 32));
235                 fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff));
236                 fh[5] = cpu_to_le32(generation);
237 
238                 len = 6;
239                 type = 2;
240 
241                 trace_ocfs2_encode_fh_parent((unsigned long long)blkno,
242                                              generation);
243         }
244 
245         *max_len = len;
246 
247 bail:
248         trace_ocfs2_encode_fh_type(type);
249         return type;
250 }
251 
252 static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb,
253                 struct fid *fid, int fh_len, int fh_type)
254 {
255         struct ocfs2_inode_handle handle;
256 
257         if (fh_len < 3 || fh_type > 2)
258                 return NULL;
259 
260         handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32;
261         handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]);
262         handle.ih_generation = le32_to_cpu(fid->raw[2]);
263         return ocfs2_get_dentry(sb, &handle);
264 }
265 
266 static struct dentry *ocfs2_fh_to_parent(struct super_block *sb,
267                 struct fid *fid, int fh_len, int fh_type)
268 {
269         struct ocfs2_inode_handle parent;
270 
271         if (fh_type != 2 || fh_len < 6)
272                 return NULL;
273 
274         parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32;
275         parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]);
276         parent.ih_generation = le32_to_cpu(fid->raw[5]);
277         return ocfs2_get_dentry(sb, &parent);
278 }
279 
280 const struct export_operations ocfs2_export_ops = {
281         .encode_fh      = ocfs2_encode_fh,
282         .fh_to_dentry   = ocfs2_fh_to_dentry,
283         .fh_to_parent   = ocfs2_fh_to_parent,
284         .get_parent     = ocfs2_get_parent,
285 };
286 

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