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
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
|
/* Utilities for reading/writing fstab, mtab, etc.
Copyright (C) 1995-2000, 2001, 2002, 2003, 2006
Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <alloca.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include "booster_fstab.h"
#include <stdlib.h>
#include <libglusterfsclient.h>
/* The default timeout for inode and stat cache. */
#define BOOSTER_DEFAULT_ATTR_TIMEO 5 /* In Secs */
/* Prepare to begin reading and/or writing mount table entries from the
beginning of FILE. MODE is as for `fopen'. */
glusterfs_fstab_t *
glusterfs_fstab_init (const char *file, const char *mode)
{
glusterfs_fstab_t *handle = NULL;
handle = calloc (1, sizeof (glusterfs_fstab_t));
if (!handle)
goto out;
FILE *result = fopen (file,mode);
if (result != NULL) {
handle->fp = result;
} else {
free (handle);
handle = NULL;
}
out:
return handle;
}
int
glusterfs_fstab_close (glusterfs_fstab_t *h)
{
if (!h)
return -1;
if (h->fp)
fclose (h->fp);
return 0;
}
/* Since the values in a line are separated by spaces, a name cannot
contain a space. Therefore some programs encode spaces in names
by the strings "\040". We undo the encoding when reading an entry.
The decoding happens in place. */
static char *
decode_name (char *buf)
{
char *rp = buf;
char *wp = buf;
do
if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '4'
&& rp[3] == '0')
{
/* \040 is a SPACE. */
*wp++ = ' ';
rp += 3;
}
else if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '1'
&& rp[3] == '1')
{
/* \011 is a TAB. */
*wp++ = '\t';
rp += 3;
}
else if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '1'
&& rp[3] == '2')
{
/* \012 is a NEWLINE. */
*wp++ = '\n';
rp += 3;
}
else if (rp[0] == '\\' && rp[1] == '\\')
{
/* We have to escape \\ to be able to represent all
* characters. */
*wp++ = '\\';
rp += 1;
}
else if (rp[0] == '\\' && rp[1] == '1' && rp[2] == '3'
&& rp[3] == '4')
{
/* \134 is also \\. */
*wp++ = '\\';
rp += 3;
}
else
*wp++ = *rp;
while (*rp++ != '\0');
return buf;
}
/* Read one mount table entry from STREAM. Returns a pointer to storage
reused on the next call, or null for EOF or error (use feof/ferror to
check). */
struct glusterfs_mntent *
__glusterfs_fstab_getent (FILE *stream, struct glusterfs_mntent *mp,
char *buffer, int bufsiz)
{
char *cp;
char *head;
do
{
char *end_ptr;
if (fgets (buffer, bufsiz, stream) == NULL)
{
return NULL;
}
end_ptr = strchr (buffer, '\n');
if (end_ptr != NULL) /* chop newline */
*end_ptr = '\0';
else
{
/* Not the whole line was read. Do it now but forget
* it. */
char tmp[1024];
while (fgets (tmp, sizeof tmp, stream) != NULL)
if (strchr (tmp, '\n') != NULL)
break;
}
head = buffer + strspn (buffer, " \t");
/* skip empty lines and comment lines: */
}
while (head[0] == '\0' || head[0] == '#');
cp = strsep (&head, " \t");
mp->mnt_fsname = cp != NULL ? decode_name (cp) : (char *) "";
if (head)
head += strspn (head, " \t");
cp = strsep (&head, " \t");
mp->mnt_dir = cp != NULL ? decode_name (cp) : (char *) "";
if (head)
head += strspn (head, " \t");
cp = strsep (&head, " \t");
mp->mnt_type = cp != NULL ? decode_name (cp) : (char *) "";
if (head)
head += strspn (head, " \t");
cp = strsep (&head, " \t");
mp->mnt_opts = cp != NULL ? decode_name (cp) : (char *) "";
switch (head ? sscanf (head, " %d %d ", &mp->mnt_freq,
&mp->mnt_passno) : 0)
{
case 0:
mp->mnt_freq = 0;
case 1:
mp->mnt_passno = 0;
case 2:
break;
}
return mp;
}
struct glusterfs_mntent *
glusterfs_fstab_getent (glusterfs_fstab_t *h)
{
if (!h)
return NULL;
if (!h->fp)
return NULL;
return __glusterfs_fstab_getent (h->fp, &h->tmpent, h->buf,
GF_MNTENT_BUFSIZE);
}
/* We have to use an encoding for names if they contain spaces or tabs.
To be able to represent all characters we also have to escape the
backslash itself. This "function" must be a macro since we use
`alloca'. */
#define encode_name(name) \
do { \
const char *rp = name; \
\
while (*rp != '\0') \
if (*rp == ' ' || *rp == '\t' || *rp == '\\') \
break; \
else \
++rp; \
\
if (*rp != '\0') \
{ \
/* In the worst case the length of the string \
* can increase to four times the current \
* length. */ \
char *wp; \
\
rp = name; \
name = wp = (char *) alloca (strlen (name) * 4 + 1); \
\
do { \
if (*rp == ' ') \
{ \
*wp++ = '\\'; \
*wp++ = '0'; \
*wp++ = '4'; \
*wp++ = '0'; \
} \
else if (*rp == '\t') \
{ \
*wp++ = '\\'; \
*wp++ = '0'; \
*wp++ = '1'; \
*wp++ = '1'; \
} \
else if (*rp == '\n') \
{ \
*wp++ = '\\'; \
*wp++ = '0'; \
*wp++ = '1'; \
*wp++ = '2'; \
} \
else if (*rp == '\\') \
{ \
*wp++ = '\\'; \
*wp++ = '\\'; \
} \
else \
*wp++ = *rp; \
} while (*rp++ != '\0'); \
} \
} while (0) \
int
glusterfs_fstab_addent (glusterfs_fstab_t *h,
const struct glusterfs_mntent *mnt)
{
struct glusterfs_mntent mntcopy = *mnt;
if (!h)
return -1;
if (!h->fp)
return -1;
if (fseek (h->fp, 0, SEEK_END))
return -1;
/* Encode spaces and tabs in the names. */
encode_name (mntcopy.mnt_fsname);
encode_name (mntcopy.mnt_dir);
encode_name (mntcopy.mnt_type);
encode_name (mntcopy.mnt_opts);
return (fprintf (h->fp, "%s %s %s %s %d %d\n",
mntcopy.mnt_fsname,
mntcopy.mnt_dir,
mntcopy.mnt_type,
mntcopy.mnt_opts,
mntcopy.mnt_freq,
mntcopy.mnt_passno)
< 0 ? 1 : 0);
}
/* Search MNT->mnt_opts for an option matching OPT.
Returns the address of the substring, or null if none found. */
char *
glusterfs_fstab_hasoption (const struct glusterfs_mntent *mnt, const char *opt)
{
const size_t optlen = strlen (opt);
char *rest = mnt->mnt_opts, *p;
while ((p = strstr (rest, opt)) != NULL)
{
if ((p == rest || p[-1] == ',')
&& (p[optlen] == '\0' || p[optlen] == '=' || p[optlen] == ','))
return p;
rest = strchr (p, ',');
if (rest == NULL)
break;
++rest;
}
return NULL;
}
void
clean_init_params (glusterfs_init_params_t *ipars)
{
if (!ipars)
return;
if (ipars->volume_name)
free (ipars->volume_name);
if (ipars->specfile)
free (ipars->specfile);
if (ipars->logfile)
free (ipars->logfile);
if (ipars->loglevel)
free (ipars->loglevel);
return;
}
char *
get_option_value (char *opt)
{
char *val = NULL;
char *saveptr = NULL;
char *copy_opt = NULL;
char *retval = NULL;
copy_opt = strdup (opt);
/* Get the = before the value of the option. */
val = index (copy_opt, '=');
if (val) {
/* Move to start of option */
++val;
/* Now, to create a '\0' delimited string out of the
* options string, first get the position where the
* next option starts, that would be the next ','.
*/
saveptr = index (val, ',');
if (saveptr)
*saveptr = '\0';
retval = strdup (val);
}
free (copy_opt);
return retval;
}
void
booster_mount (struct glusterfs_mntent *ent)
{
char *opt = NULL;
glusterfs_init_params_t ipars;
time_t timeout = BOOSTER_DEFAULT_ATTR_TIMEO;
char *timeostr = NULL;
char *endptr = NULL;
if (!ent)
return;
if ((strcmp (ent->mnt_type, "glusterfs") != 0))
return;
memset (&ipars, 0, sizeof (glusterfs_init_params_t));
if (ent->mnt_fsname)
ipars.specfile = strdup (ent->mnt_fsname);
opt = glusterfs_fstab_hasoption (ent, "subvolume");
if (opt)
ipars.volume_name = get_option_value (opt);
opt = glusterfs_fstab_hasoption (ent, "log-file");
if (!opt)
opt = glusterfs_fstab_hasoption (ent, "logfile");
if (opt)
ipars.logfile = get_option_value (opt);
opt = glusterfs_fstab_hasoption (ent, "log-level");
if (!opt)
opt = glusterfs_fstab_hasoption (ent, "loglevel");
if (opt)
ipars.loglevel = get_option_value (opt);
/* Attribute cache timeout */
opt = glusterfs_fstab_hasoption (ent, "attr_timeout");
if (opt) {
timeostr = get_option_value (opt);
if (timeostr)
timeout = strtol (timeostr, &endptr, 10);
}
ipars.lookup_timeout = timeout;
ipars.stat_timeout = timeout;
glusterfs_mount (ent->mnt_dir, &ipars);
clean_init_params (&ipars);
}
int
booster_configure (char *confpath)
{
int ret = -1;
glusterfs_fstab_t *handle = NULL;
struct glusterfs_mntent *ent = NULL;
if (!confpath)
goto out;
handle = glusterfs_fstab_init (confpath, "r");
if (!handle)
goto out;
while ((ent = glusterfs_fstab_getent (handle)) != NULL)
booster_mount (ent);
glusterfs_fstab_close (handle);
ret = 0;
out:
return ret;
}
|
