summaryrefslogtreecommitdiffstats
path: root/xlators/nfs/server/src/nfs3-fh.c
blob: d38d566d4d9be57e130436b48159a9bbf0467ed0 (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
/*
  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 "nfs3-fh.h"
#include "nfs-common.h"
#include "iatt.h"
#include "common-utils.h"


int
nfs3_fh_validate (struct nfs3_fh *fh)
{
	if (!fh)
		return 0;

	if (fh->ident[0] != GF_NFSFH_IDENT0)
		return 0;

	if (fh->ident[1] != GF_NFSFH_IDENT1)
		return 0;

        return 1;
}


void
nfs3_fh_init (struct nfs3_fh *fh, struct iatt *buf)
{
        if ((!fh) || (!buf))
                return;

        fh->ident[0] = GF_NFSFH_IDENT0;
        fh->ident[1] = GF_NFSFH_IDENT1;

        fh->hashcount = 0;
        uuid_copy (fh->gfid, buf->ia_gfid);
}


struct nfs3_fh
nfs3_fh_build_indexed_root_fh (xlator_list_t *cl, xlator_t *xl)
{
        struct nfs3_fh  fh = {{0}, };
        struct iatt     buf = {0, };
        uuid_t          root = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};

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

        uuid_copy (buf.ia_gfid, root);
        nfs3_fh_init (&fh, &buf);
        fh.exportid [15] = nfs_xlator_to_xlid (cl, xl);

        return fh;
}


struct nfs3_fh
nfs3_fh_build_uuid_root_fh (uuid_t volumeid)
{
        struct nfs3_fh  fh = {{0}, };
        struct iatt     buf = {0, };
        uuid_t          root = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};

        uuid_copy (buf.ia_gfid, root);
        nfs3_fh_init (&fh, &buf);
        uuid_copy (fh.exportid, volumeid);

        return fh;
}


int
nfs3_fh_is_root_fh (struct nfs3_fh *fh)
{
        uuid_t  rootgfid = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};

        if (!fh)
                return 0;

        if (uuid_compare (fh->gfid, rootgfid) == 0)
                return 1;

        return 0;
}


nfs3_hash_entry_t
nfs3_fh_hash_entry (uuid_t gfid)
{
        nfs3_hash_entry_t       hash = 0;
        int                     shiftsize = 48;
        uint64_t                ino = 0;
        uint64_t                gen = 0;
        nfs3_hash_entry_t       inomsb = 0;
        nfs3_hash_entry_t       inolsb = 0;
        nfs3_hash_entry_t       inols23b = 0;

        nfs3_hash_entry_t       genmsb = 0;
        nfs3_hash_entry_t       genlsb = 0;
        nfs3_hash_entry_t       genls23b = 0;

        memcpy (&ino, &gfid[8], 8);
        hash = ino;
        while (shiftsize != 0) {
                hash ^= (ino >> shiftsize);
                shiftsize -= 16;
        }
/*
        gf_log ("FILEHANDLE", GF_LOG_TRACE, "INO %"PRIu64, ino);
        gf_log ("FILEHANDLE",GF_LOG_TRACE, "PRI HASH %d", hash);
*/
        inomsb = (ino >> 56);
//        gf_log ("FILEHANDLE", GF_LOG_TRACE, "inomsb %d", inomsb);

        inolsb = ((ino << 56) >> 56);
//        gf_log ("FILEHANDLE", GF_LOG_TRACE, "inolsb %d", inolsb);

        inolsb = (inolsb << 8);
//        gf_log ("FILEHANDLE", GF_LOG_TRACE, "inolsb to inomsb %d", inolsb);
        inols23b = ((ino << 40) >> 48);
//        gf_log ("FILEHANDLE", GF_LOG_TRACE, "inols23b %d", inols23b);

        inols23b = (inols23b << 8);
//        gf_log ("FILEHDNALE", GF_LOG_TRACE, "inols23b  %d", inols23b);

        memcpy (&gen, &gfid[0], 8);
        genmsb = (gen >> 56);
//        gf_log ("FILEHANDLE", GF_LOG_TRACE, "inomsb %d", inomsb);

        genlsb = ((gen << 56) >> 56);
//        gf_log ("FILEHANDLE", GF_LOG_TRACE, "inolsb %d", inolsb);

        genlsb = (genlsb << 8);
//        gf_log ("FILEHANDLE", GF_LOG_TRACE, "inolsb to inomsb %d", inolsb);

        genls23b = ((gen << 40) >> 48);
//        gf_log ("FILEHANDLE", GF_LOG_TRACE, "inols23b %d", inols23b);

        genls23b = (genls23b << 8);
//        gf_log ("FILEHDNALE", GF_LOG_TRACE, "inols23b  %d", inols23b);

        hash ^= inolsb ^ inomsb ^ inols23b ^ genmsb ^ genlsb ^ genls23b;
        return hash;

}

void
nfs3_fh_to_str (struct nfs3_fh *fh, char *str)
{
        char            gfid[512];
        char            exportid[512];

        if ((!fh) || (!str))
                return;

        sprintf (str, "FH: hashcount %d, exportid %s, gfid %s",
                 fh->hashcount, uuid_utoa_r (fh->exportid, exportid),
                 uuid_utoa_r (fh->gfid, gfid));
}

void
nfs3_log_fh (struct nfs3_fh *fh)
{
//        int     x = 0;
        char    gfidstr[512];
        char    exportidstr[512];

        if (!fh)
                return;

        gf_log ("nfs3-fh", GF_LOG_TRACE, "filehandle: hashcount %d, exportid "
                "0x%s, gfid 0x%s", fh->hashcount,
                 uuid_utoa_r (fh->exportid, exportidstr),
                 uuid_utoa_r (fh->gfid, gfidstr));
/*
        for (; x < fh->hashcount; ++x)
                gf_log ("FILEHANDLE", GF_LOG_TRACE, "Hash %d: %d", x,
                        fh->entryhash[x]);
*/
}

int
nfs3_fh_build_parent_fh (struct nfs3_fh *child, struct iatt *newstat,
                         struct nfs3_fh *newfh)
{
        if ((!child) || (!newstat) || (!newfh))
                return -1;

        nfs3_fh_init (newfh, newstat);
        uuid_copy (newfh->exportid, child->exportid);
        if (newstat->ia_ino == 1)
                goto done;

        newfh->hashcount = child->hashcount - 1;
        memcpy (newfh->entryhash, child->entryhash,
                newfh->hashcount * GF_NFSFH_ENTRYHASH_SIZE);

done:
//        nfs3_log_fh (newfh);

        return 0;
}


int
nfs3_fh_build_child_fh (struct nfs3_fh *parent, struct iatt *newstat,
                        struct nfs3_fh *newfh)
{
        int             hashcount = 0;
        int             entry = 0;

        if ((!parent) || (!newstat) || (!newfh))
                return -1;

        nfs3_fh_init (newfh, newstat);
        uuid_copy (newfh->exportid, parent->exportid);

        newfh->hashcount = parent->hashcount + 1;
        /* Only copy the hashes that are available in the parent file
         * handle. */
        if (parent->hashcount > GF_NFSFH_MAXHASHES)
                hashcount = GF_NFSFH_MAXHASHES;
        else
                hashcount = parent->hashcount;

        memcpy (newfh->entryhash, parent->entryhash,
                hashcount * GF_NFSFH_ENTRYHASH_SIZE);

        /* Do not insert parent dir hash if there is no space left in the hash
         * array of the child entry. */
        if (newfh->hashcount <= GF_NFSFH_MAXHASHES) {
                entry = newfh->hashcount - 1;
                newfh->entryhash[entry] = nfs3_fh_hash_entry (parent->gfid);
        }

//        nfs3_log_fh (newfh);

        return 0;
}


uint32_t
nfs3_fh_compute_size (struct nfs3_fh *fh)
{
        uint32_t        fhlen = 0;

        if (!fh)
                return 0;

        if (fh->hashcount <= GF_NFSFH_MAXHASHES)
                fhlen = nfs3_fh_hashcounted_size (fh->hashcount);
        else
                fhlen = nfs3_fh_hashcounted_size (GF_NFSFH_MAXHASHES);

        return fhlen;
}


/* There is no point searching at a directory level which is beyond that of
 * the hashcount given in the file handle.
 */
int
nfs3_fh_hash_index_is_beyond (struct nfs3_fh *fh, int hashidx)
{
        if (!fh)
                return 1;

        if (fh->hashcount >= hashidx)
                return 0;
        else
                return 1;

        return 1;
}