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:
7 * Functions to facilitate NFS exporting
9 * Copyright (C) 2002, 2005 Oracle. All rights reserved.
13 #include <linux/types.h>
15 #include <cluster/masklog.h>
26 #include "buffer_head_io.h"
28 #include "ocfs2_trace.h"
30 struct ocfs2_inode_handle
36 static struct dentry *ocfs2_get_dentry(struct super_block *sb,
37 struct ocfs2_inode_handle *handle)
40 struct ocfs2_super *osb = OCFS2_SB(sb);
41 u64 blkno = handle->ih_blkno;
43 struct dentry *result;
45 trace_ocfs2_get_dentry_begin(sb, handle, (unsigned long long)blkno);
48 result = ERR_PTR(-ESTALE);
52 inode = ocfs2_ilookup(sb, blkno);
54 * If the inode exists in memory, we only need to check it's
61 * This will synchronize us against ocfs2_delete_inode() on
64 status = ocfs2_nfs_sync_lock(osb, 1);
66 mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status);
70 status = ocfs2_test_inode_bit(osb, blkno, &set);
72 if (status == -EINVAL) {
74 * The blkno NFS gave us doesn't even show up
75 * as an inode, we return -ESTALE to be
80 mlog(ML_ERROR, "test inode bit failed %d\n", status);
84 trace_ocfs2_get_dentry_test_bit(status, set);
85 /* If the inode allocator bit is clear, this inode must be stale */
91 inode = ocfs2_iget(osb, blkno, 0, 0);
94 ocfs2_nfs_sync_unlock(osb, 1);
98 if (status == -ESTALE) {
99 trace_ocfs2_get_dentry_stale((unsigned long long)blkno,
100 handle->ih_generation);
102 result = ERR_PTR(status);
107 mlog_errno(PTR_ERR(inode));
108 result = ERR_CAST(inode);
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);
118 result = ERR_PTR(-ESTALE);
122 result = d_obtain_alias(inode);
124 mlog_errno(PTR_ERR(result));
127 trace_ocfs2_get_dentry_end(result);
131 static struct dentry *ocfs2_get_parent(struct dentry *child)
135 struct dentry *parent;
136 struct inode *dir = d_inode(child);
139 trace_ocfs2_get_parent(child, child->d_name.len, child->d_name.name,
140 (unsigned long long)OCFS2_I(dir)->ip_blkno);
142 status = ocfs2_nfs_sync_lock(OCFS2_SB(dir->i_sb), 1);
144 mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status);
145 parent = ERR_PTR(status);
149 status = ocfs2_inode_lock(dir, NULL, 0);
151 if (status != -ENOENT)
153 parent = ERR_PTR(status);
154 goto unlock_nfs_sync;
157 status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno);
159 parent = ERR_PTR(-ENOENT);
163 status = ocfs2_test_inode_bit(OCFS2_SB(dir->i_sb), blkno, &set);
165 if (status == -EINVAL) {
168 mlog(ML_ERROR, "test inode bit failed %d\n", status);
169 parent = ERR_PTR(status);
173 trace_ocfs2_get_dentry_test_bit(status, set);
176 parent = ERR_PTR(status);
180 parent = d_obtain_alias(ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0));
183 ocfs2_inode_unlock(dir, 0);
186 ocfs2_nfs_sync_unlock(OCFS2_SB(dir->i_sb), 1);
189 trace_ocfs2_get_parent_end(parent);
194 static int ocfs2_encode_fh(struct inode *inode, u32 *fh_in, int *max_len,
195 struct inode *parent)
201 __le32 *fh = (__force __le32 *) fh_in;
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,
207 fh, len, connectable);
210 if (parent && (len < 6)) {
212 type = FILEID_INVALID;
214 } else if (len < 3) {
216 type = FILEID_INVALID;
220 blkno = OCFS2_I(inode)->ip_blkno;
221 generation = inode->i_generation;
223 trace_ocfs2_encode_fh_self((unsigned long long)blkno, generation);
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);
231 blkno = OCFS2_I(parent)->ip_blkno;
232 generation = parent->i_generation;
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);
241 trace_ocfs2_encode_fh_parent((unsigned long long)blkno,
248 trace_ocfs2_encode_fh_type(type);
252 static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb,
253 struct fid *fid, int fh_len, int fh_type)
255 struct ocfs2_inode_handle handle;
257 if (fh_len < 3 || fh_type > 2)
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);
266 static struct dentry *ocfs2_fh_to_parent(struct super_block *sb,
267 struct fid *fid, int fh_len, int fh_type)
269 struct ocfs2_inode_handle parent;
271 if (fh_type != 2 || fh_len < 6)
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);
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,