summaryrefslogtreecommitdiffstats
path: root/xlators/nfs/server/src/nfs-common.c
blob: 3623f041c146e69c59163a7448827e76238b1209 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
/*
  Copyright (c) 2010 Gluster, Inc. <http://www.gluster.com>
  This file is part of GlusterFS.

  GlusterFS is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published
  by the Free Software Foundation; either version 3 of the License,
  or (at your option) any later version.

  GlusterFS is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see
  <http://www.gnu.org/licenses/>.
*/

#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif

#include "rpcsvc.h"
#include "dict.h"
#include "xlator.h"
#include "xdr-nfs3.h"
#include "msg-nfs3.h"
#include "iobuf.h"
#include "nfs-common.h"
#include "nfs-fops.h"
#include "rpcsvc.h"
#include "iatt.h"

#include <libgen.h>

xlator_t *
nfs_xlid_to_xlator (xlator_list_t *cl, uint8_t xlid)
{
        xlator_t        *xl = NULL;
        uint8_t         id = 0;

        while (id <= xlid) {
                if (!cl) {
                        xl = NULL;
                        break;
                }

                xl = cl->xlator;
                cl = cl->next;
                id++;
        }

        return xl;
}


xlator_t *
nfs_path_to_xlator (xlator_list_t *cl, char *path)
{
        return NULL;
}


uint16_t
nfs_xlator_to_xlid (xlator_list_t *cl, xlator_t *xl)
{
        uint16_t        xlid = 0;

        if ((!cl) || (!xl))
                return 0;

        while (cl) {
                if (xl == cl->xlator)
                        break;
                cl = cl->next;
                ++xlid;
        }

        return xlid;
}


xlator_t *
nfs_mntpath_to_xlator (xlator_list_t *cl, char *path)
{
        char            volname[MNTPATHLEN];
        char            *volptr = NULL;
        int             pathlen = 0;
        xlator_t        *targetxl = NULL;

        if ((!cl) || (!path))
                return NULL;

        strcpy (volname, path);
        pathlen = strlen (volname);
        gf_log (GF_NFS, GF_LOG_TRACE, "Subvolume search: %s", path);
        if (volname[0] == '/')
                volptr = &volname[1];
        else
                volptr = &volname[0];

        if (volname[pathlen - 1] == '/')
                volname[pathlen - 1] = '\0';

        while (cl) {
                if (strcmp (volptr, cl->xlator->name) == 0) {
                        targetxl = cl->xlator;
                        break;
                }

                cl = cl->next;
        }

        return targetxl;

}


/* Returns 1 if the stat seems to be filled with zeroes. */
int
nfs_zero_filled_stat (struct iatt *buf)
{
        if (!buf)
                return 1;

        /* Do not use st_dev because it is transformed to store the xlator id
         * in place of the device number. Do not use st_ino because by this time
         * we've already mapped the root ino to 1 so it is not guaranteed to be
         * 0.
         */
        if ((buf->ia_nlink == 0) && (buf->ia_type == 0))
                return 1;

        return 0;
}


void
nfs_loc_wipe (loc_t *loc)
{
        if (!loc)
                return;

        if (loc->path) {
                FREE (loc->path);
                loc->path = NULL;
        }

        if (loc->parent) {
                inode_unref (loc->parent);
                loc->parent = NULL;
	}

        if (loc->inode) {
                inode_unref (loc->inode);
                loc->inode = NULL;
        }

        loc->ino = 0;
}


int
nfs_loc_copy (loc_t *dst, loc_t *src)
{
	int ret = -1;

	dst->ino = src->ino;

	if (src->inode)
		dst->inode = inode_ref (src->inode);

	if (src->parent)
		dst->parent = inode_ref (src->parent);

	dst->path = strdup (src->path);

	if (!dst->path)
		goto out;

	dst->name = strrchr (dst->path, '/');
	if (dst->name)
		dst->name++;

	ret = 0;
out:
	return ret;
}


int
nfs_loc_fill (loc_t *loc, inode_t *inode, inode_t *parent, char *path)
{
        int     ret = -EFAULT;

        if (!loc)
                return ret;

        if (inode) {
                loc->inode = inode_ref (inode);
                loc->ino = inode->ino;
        }

        if (parent)
                loc->parent = inode_ref (parent);

        loc->path = strdup (path);
        if (!loc->path) {
                gf_log (GF_NFS, GF_LOG_ERROR, "strdup failed");
                goto loc_wipe;
        }

        loc->name = strrchr (loc->path, '/');
        if (loc->name)
                loc->name++;
        else
                goto loc_wipe;

        ret = 0;
loc_wipe:
        if (ret < 0)
                nfs_loc_wipe (loc);

        return ret;
}


int
nfs_inode_loc_fill (inode_t *inode, loc_t *loc)
{
        char            *resolvedpath = NULL;
        inode_t         *parent = NULL;
        int             ret = -EFAULT;

        if ((!inode) || (!loc))
                return ret;

        if ((inode) && (inode->ino == 1))
                goto ignore_parent;

        parent = inode_parent (inode, 0, NULL);
        if (!parent)
                goto err;

ignore_parent:
        ret = inode_path (inode, NULL, &resolvedpath);
        if (ret < 0)
                goto err;

        ret = nfs_loc_fill (loc, inode, parent, resolvedpath);
        if (ret < 0)
                goto err;

err:
        if (parent)
                inode_unref (parent);

        if (resolvedpath)
                FREE (resolvedpath);

        return ret;
}


int
nfs_ino_loc_fill (inode_table_t *itable, uint64_t ino, uint64_t gen, loc_t *loc)
{
        int             ret = -EFAULT;
        inode_t         *inode = NULL;

        if (!loc)
                return ret;

        inode = inode_get (itable, ino, gen);
        if (!inode) {
                ret = -ENOENT;
                goto err;
        }

        ret = nfs_inode_loc_fill (inode, loc);

err:
        if (inode)
                inode_unref (inode);
        return ret;
}


int
nfs_parent_inode_loc_fill (inode_t *parent, inode_t *entryinode, char *entry,
                           loc_t *loc)
{
        int             ret = -EFAULT;
        char            *path = NULL;

        if ((!parent) || (!entry) || (!loc) || (!entryinode))
                return ret;

        ret = inode_path (parent, entry, &path);
        if (ret < 0)
                goto err;

        ret = nfs_loc_fill (loc, entryinode, parent, path);

err:
        return ret;
}


/* Returns -1 if parent is not available, return -2 if the entry is not
 * available. In case the return is going to be -2, and how = NFS_RESOLVE_CREATE
 * it does however fill in the loc so that it can be used to perform a lookup
 * fop for the entry.
 * On other errors, return -3. 0 on success.
 */
int
nfs_entry_loc_fill (inode_table_t *itable, ino_t ino, uint64_t gen, char *entry,
                    loc_t *loc, int how)
{
        inode_t         *parent = NULL;
        inode_t         *entryinode = NULL;
        int             ret = -3;
        char            *resolvedpath = NULL;

        if ((!itable) || (!entry) || (!loc))
                return ret;

        parent = inode_get (itable, ino, gen);

        ret = -1;
        /* Will need hard resolution now */
        if (!parent)
                goto err;

        ret = -2;
        entryinode = inode_grep (itable, parent, entry);
        if (!entryinode) {
                if (how != NFS_RESOLVE_CREATE)
                        goto err;
                else {
                        /* Even though we'll create the inode and the loc for
                         * a missing inode, we still need to return -2 so
                         * that the caller can use the filled loc to call
                         * lookup.
                         */
                        entryinode = inode_new (itable);
                        nfs_parent_inode_loc_fill (parent, entryinode, entry,
                                                   loc);
                        goto err;
                }
        }

        ret = inode_path (parent, entry, &resolvedpath);
        if (ret < 0) {
                ret = -3;
                goto err;
        }

        ret = nfs_loc_fill (loc, entryinode, parent, resolvedpath);
        if (ret < 0)
                ret = -3;

err:
        if (parent)
                inode_unref (parent);

        if (entryinode)
                inode_unref (entryinode);

        if (resolvedpath)
                FREE (resolvedpath);

        return ret;
}