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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
34#include "alloc.h"
35#include "dir.h"
36#include "dlmglue.h"
37#include "dcache.h"
38#include "export.h"
39#include "inode.h"
40
41#include "buffer_head_io.h"
42#include "suballoc.h"
43
44struct ocfs2_inode_handle
45{
46 u64 ih_blkno;
47 u32 ih_generation;
48};
49
50static 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 mlog_entry("(0x%p, 0x%p)\n", sb, handle);
60
61 if (blkno == 0) {
62 mlog(0, "nfs wants inode with blkno: 0\n");
63 result = ERR_PTR(-ESTALE);
64 goto bail;
65 }
66
67 inode = ocfs2_ilookup(sb, blkno);
68
69
70
71
72 if (inode)
73 goto check_gen;
74
75
76
77
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 }
84
85 status = ocfs2_test_inode_bit(osb, blkno, &set);
86 if (status < 0) {
87 if (status == -EINVAL) {
88
89
90
91
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
102 if (!set) {
103 mlog(0, "inode %llu suballoc bit is clear\n",
104 (unsigned long long)blkno);
105 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",
118 (unsigned long long)blkno, handle->ih_generation);
119 }
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:
131 if (handle->ih_generation != inode->i_generation) {
132 iput(inode);
133 mlog(0, "stale inode ino: %llu generation: %u\n",
134 (unsigned long long)blkno, handle->ih_generation);
135 result = ERR_PTR(-ESTALE);
136 goto bail;
137 }
138
139 result = d_obtain_alias(inode);
140 if (!IS_ERR(result))
141 result->d_op = &ocfs2_dentry_ops;
142 else
143 mlog_errno(PTR_ERR(result));
144
145bail:
146 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;
155 struct inode *dir = child->d_inode;
156
157 mlog_entry("(0x%p, '%.*s')\n", child,
158 child->d_name.len, child->d_name.name);
159
160 mlog(0, "find parent of directory %llu\n",
161 (unsigned long long)OCFS2_I(dir)->ip_blkno);
162
163 status = ocfs2_inode_lock(dir, NULL, 0);
164 if (status < 0) {
165 if (status != -ENOENT)
166 mlog_errno(status);
167 parent = ERR_PTR(status);
168 goto bail;
169 }
170
171 status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno);
172 if (status < 0) {
173 parent = ERR_PTR(-ENOENT);
174 goto bail_unlock;
175 }
176
177 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;
180
181bail_unlock:
182 ocfs2_inode_unlock(dir, 0);
183
184bail:
185 mlog_exit_ptr(parent);
186
187 return parent;
188}
189
190static int ocfs2_encode_fh(struct dentry *dentry, u32 *fh_in, int *max_len,
191 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;
198 __le32 *fh = (__force __le32 *) fh_in;
199
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
213 mlog(0, "Encoding fh: blkno: %llu, generation: %u\n",
214 (unsigned long long)blkno, generation);
215
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
239 mlog(0, "Encoding parent: blkno: %llu, generation: %u\n",
240 (unsigned long long)blkno, generation);
241 }
242
243 *max_len = len;
244
245bail:
246 mlog_exit(type);
247 return type;
248}
249
250static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb,
251 struct fid *fid, int fh_len, int fh_type)
252{
253 struct ocfs2_inode_handle handle;
254
255 if (fh_len < 3 || fh_type > 2)
256 return NULL;
257
258 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}
263
264static 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;
268
269 if (fh_type != 2 || fh_len < 6)
270 return NULL;
271
272 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);
276}
277
278const struct export_operations ocfs2_export_ops = {
279 .encode_fh = ocfs2_encode_fh,
280 .fh_to_dentry = ocfs2_fh_to_dentry,
281 .fh_to_parent = ocfs2_fh_to_parent,
282 .get_parent = ocfs2_get_parent,
283};
284
