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libext2fs: don't use O_DIRECT for files on tmpfs
[tools/e2fsprogs.git] / lib / ext2fs / test_io.c
1 /*
2  * test_io.c --- This is the Test I/O interface.
3  *
4  * Copyright (C) 1996 Theodore Ts'o.
5  *
6  * %Begin-Header%
7  * This file may be redistributed under the terms of the GNU Library
8  * General Public License, version 2.
9  * %End-Header%
10  */
11
12 #include "config.h"
13 #include <stdio.h>
14 #include <string.h>
15 #if HAVE_UNISTD_H
16 #include <unistd.h>
17 #endif
18 #include <fcntl.h>
19 #include <time.h>
20 #if HAVE_SYS_STAT_H
21 #include <sys/stat.h>
22 #endif
23 #if HAVE_SYS_TYPES_H
24 #include <sys/types.h>
25 #endif
26 #ifdef HAVE_SYS_PRCTL_H
27 #include <sys/prctl.h>
28 #else
29 #define PR_GET_DUMPABLE 3
30 #endif
31 #if (!defined(HAVE_PRCTL) && defined(linux))
32 #include <sys/syscall.h>
33 #endif
34
35 #include "ext2_fs.h"
36 #include "ext2fs.h"
37
38 /*
39  * For checking structure magic numbers...
40  */
41
42 #define EXT2_CHECK_MAGIC(struct, code) \
43           if ((struct)->magic != (code)) return (code)
44
45 struct test_private_data {
46         int     magic;
47         io_channel real;
48         int flags;
49         FILE *outfile;
50         unsigned long block;
51         int read_abort_count, write_abort_count;
52         void (*read_blk)(unsigned long block, int count, errcode_t err);
53         void (*write_blk)(unsigned long block, int count, errcode_t err);
54         void (*set_blksize)(int blksize, errcode_t err);
55         void (*write_byte)(unsigned long block, int count, errcode_t err);
56         void (*read_blk64)(unsigned long long block, int count, errcode_t err);
57         void (*write_blk64)(unsigned long long block, int count, errcode_t err);
58 };
59
60 /*
61  * These global variable can be set by the test program as
62  * necessary *before* calling test_open
63  */
64 io_manager test_io_backing_manager = 0;
65 void (*test_io_cb_read_blk)
66         (unsigned long block, int count, errcode_t err) = 0;
67 void (*test_io_cb_write_blk)
68         (unsigned long block, int count, errcode_t err) = 0;
69 void (*test_io_cb_read_blk64)
70         (unsigned long long block, int count, errcode_t err) = 0;
71 void (*test_io_cb_write_blk64)
72         (unsigned long long block, int count, errcode_t err) = 0;
73 void (*test_io_cb_set_blksize)
74         (int blksize, errcode_t err) = 0;
75 void (*test_io_cb_write_byte)
76         (unsigned long block, int count, errcode_t err) = 0;
77
78 /*
79  * Test flags
80  */
81 #define TEST_FLAG_READ                  0x01
82 #define TEST_FLAG_WRITE                 0x02
83 #define TEST_FLAG_SET_BLKSIZE           0x04
84 #define TEST_FLAG_FLUSH                 0x08
85 #define TEST_FLAG_DUMP                  0x10
86 #define TEST_FLAG_SET_OPTION            0x20
87 #define TEST_FLAG_DISCARD               0x40
88 #define TEST_FLAG_READAHEAD             0x80
89 #define TEST_FLAG_ZEROOUT               0x100
90
91 static void test_dump_block(io_channel channel,
92                             struct test_private_data *data,
93                             unsigned long block, const void *buf)
94 {
95         const unsigned char *cp;
96         FILE *f = data->outfile;
97         int     i;
98         unsigned long   cksum = 0;
99
100         for (i=0, cp = buf; i < channel->block_size; i++, cp++) {
101                 cksum += *cp;
102         }
103         fprintf(f, "Contents of block %lu, checksum %08lu: \n", block, cksum);
104         for (i=0, cp = buf; i < channel->block_size; i++, cp++) {
105                 if ((i % 16) == 0)
106                         fprintf(f, "%04x: ", i);
107                 fprintf(f, "%02x%c", *cp, ((i % 16) == 15) ? '\n' : ' ');
108         }
109 }
110
111 /*
112  * Flush data buffers to disk.
113  */
114 static errcode_t test_flush(io_channel channel)
115 {
116         struct test_private_data        *data;
117         errcode_t                       retval = 0;
118
119         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
120         data = (struct test_private_data *)channel->private_data;
121         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
122
123         if (data->real)
124                 retval = io_channel_flush(data->real);
125
126         if (data->flags & TEST_FLAG_FLUSH)
127                 fprintf(data->outfile, "Test_io: flush() returned %s\n",
128                         retval ? error_message(retval) : "OK");
129
130         return retval;
131 }
132
133 static void test_abort(io_channel channel, unsigned long block)
134 {
135         struct test_private_data *data;
136         FILE *f;
137
138         data = (struct test_private_data *) channel->private_data;
139         f = data->outfile;
140         test_flush(channel);
141
142         fprintf(f, "Aborting due to I/O to block %lu\n", block);
143         fflush(f);
144         abort();
145 }
146
147 static char *safe_getenv(const char *arg)
148 {
149 #if !defined(_WIN32)
150         if ((getuid() != geteuid()) || (getgid() != getegid()))
151                 return NULL;
152 #endif
153 #if HAVE_PRCTL
154         if (prctl(PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
155                 return NULL;
156 #else
157 #if (defined(linux) && defined(SYS_prctl))
158         if (syscall(SYS_prctl, PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
159                 return NULL;
160 #endif
161 #endif
162
163 #if defined(HAVE_SECURE_GETENV)
164         return secure_getenv(arg);
165 #elif defined(HAVE___SECURE_GETENV)
166         return __secure_getenv(arg);
167 #else
168         return getenv(arg);
169 #endif
170 }
171
172 static errcode_t test_open(const char *name, int flags, io_channel *channel)
173 {
174         io_channel      io = NULL;
175         struct test_private_data *data = NULL;
176         errcode_t       retval;
177         char            *value;
178
179         if (name == 0)
180                 return EXT2_ET_BAD_DEVICE_NAME;
181         retval = ext2fs_get_mem(sizeof(struct struct_io_channel), &io);
182         if (retval)
183                 goto cleanup;
184         memset(io, 0, sizeof(struct struct_io_channel));
185         io->magic = EXT2_ET_MAGIC_IO_CHANNEL;
186         retval = ext2fs_get_mem(sizeof(struct test_private_data), &data);
187         if (retval)
188                 goto cleanup;
189         io->manager = test_io_manager;
190         retval = ext2fs_get_mem(strlen(name)+1, &io->name);
191         if (retval)
192                 goto cleanup;
193
194         strcpy(io->name, name);
195         io->private_data = data;
196         io->block_size = 1024;
197         io->read_error = 0;
198         io->write_error = 0;
199         io->refcount = 1;
200
201         memset(data, 0, sizeof(struct test_private_data));
202         data->magic = EXT2_ET_MAGIC_TEST_IO_CHANNEL;
203         if (test_io_backing_manager) {
204                 retval = test_io_backing_manager->open(name, flags,
205                                                        &data->real);
206                 if (retval)
207                         goto cleanup;
208         } else {
209                 data->real = 0;
210         }
211         data->read_blk =        test_io_cb_read_blk;
212         data->write_blk =       test_io_cb_write_blk;
213         data->set_blksize =     test_io_cb_set_blksize;
214         data->write_byte =      test_io_cb_write_byte;
215         data->read_blk64 =      test_io_cb_read_blk64;
216         data->write_blk64 =     test_io_cb_write_blk64;
217
218         data->outfile = NULL;
219         if ((value = safe_getenv("TEST_IO_LOGFILE")) != NULL)
220                 data->outfile = fopen(value, "w");
221         if (!data->outfile)
222                 data->outfile = stderr;
223
224         data->flags = 0;
225         if ((value = safe_getenv("TEST_IO_FLAGS")) != NULL)
226                 data->flags = strtoul(value, NULL, 0);
227
228         data->block = 0;
229         if ((value = safe_getenv("TEST_IO_BLOCK")) != NULL)
230                 data->block = strtoul(value, NULL, 0);
231
232         data->read_abort_count = 0;
233         if ((value = safe_getenv("TEST_IO_READ_ABORT")) != NULL)
234                 data->read_abort_count = strtoul(value, NULL, 0);
235
236         data->write_abort_count = 0;
237         if ((value = safe_getenv("TEST_IO_WRITE_ABORT")) != NULL)
238                 data->write_abort_count = strtoul(value, NULL, 0);
239
240         if (data->real)
241                 io->align = data->real->align;
242
243         *channel = io;
244         return 0;
245
246 cleanup:
247         if (io)
248                 ext2fs_free_mem(&io);
249         if (data)
250                 ext2fs_free_mem(&data);
251         return retval;
252 }
253
254 static errcode_t test_close(io_channel channel)
255 {
256         struct test_private_data *data;
257         errcode_t       retval = 0;
258
259         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
260         data = (struct test_private_data *) channel->private_data;
261         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
262
263         if (--channel->refcount > 0)
264                 return 0;
265
266         if (data->real)
267                 retval = io_channel_close(data->real);
268
269         if (data->outfile && data->outfile != stderr)
270                 fclose(data->outfile);
271
272         ext2fs_free_mem(&channel->private_data);
273         if (channel->name)
274                 ext2fs_free_mem(&channel->name);
275         ext2fs_free_mem(&channel);
276         return retval;
277 }
278
279 static errcode_t test_set_blksize(io_channel channel, int blksize)
280 {
281         struct test_private_data *data;
282         errcode_t       retval = 0;
283
284         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
285         data = (struct test_private_data *) channel->private_data;
286         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
287
288         if (data->real) {
289                 retval = io_channel_set_blksize(data->real, blksize);
290                 channel->align = data->real->align;
291         }
292         if (data->set_blksize)
293                 data->set_blksize(blksize, retval);
294         if (data->flags & TEST_FLAG_SET_BLKSIZE)
295                 fprintf(data->outfile,
296                         "Test_io: set_blksize(%d) returned %s\n",
297                         blksize, retval ? error_message(retval) : "OK");
298         channel->block_size = blksize;
299         return retval;
300 }
301
302
303 static errcode_t test_read_blk(io_channel channel, unsigned long block,
304                                int count, void *buf)
305 {
306         struct test_private_data *data;
307         errcode_t       retval = 0;
308
309         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
310         data = (struct test_private_data *) channel->private_data;
311         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
312
313         if (data->real)
314                 retval = io_channel_read_blk(data->real, block, count, buf);
315         if (data->read_blk)
316                 data->read_blk(block, count, retval);
317         if (data->flags & TEST_FLAG_READ)
318                 fprintf(data->outfile,
319                         "Test_io: read_blk(%lu, %d) returned %s\n",
320                         block, count, retval ? error_message(retval) : "OK");
321         if (data->block && data->block == block) {
322                 if (data->flags & TEST_FLAG_DUMP)
323                         test_dump_block(channel, data, block, buf);
324                 if (--data->read_abort_count == 0)
325                         test_abort(channel, block);
326         }
327         return retval;
328 }
329
330 static errcode_t test_write_blk(io_channel channel, unsigned long block,
331                                int count, const void *buf)
332 {
333         struct test_private_data *data;
334         errcode_t       retval = 0;
335
336         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
337         data = (struct test_private_data *) channel->private_data;
338         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
339
340         if (data->real)
341                 retval = io_channel_write_blk(data->real, block, count, buf);
342         if (data->write_blk)
343                 data->write_blk(block, count, retval);
344         if (data->flags & TEST_FLAG_WRITE)
345                 fprintf(data->outfile,
346                         "Test_io: write_blk(%lu, %d) returned %s\n",
347                         block, count, retval ? error_message(retval) : "OK");
348         if (data->block && data->block == block) {
349                 if (data->flags & TEST_FLAG_DUMP)
350                         test_dump_block(channel, data, block, buf);
351                 if (--data->write_abort_count == 0)
352                         test_abort(channel, block);
353         }
354         return retval;
355 }
356
357 static errcode_t test_read_blk64(io_channel channel, unsigned long long block,
358                                int count, void *buf)
359 {
360         struct test_private_data *data;
361         errcode_t       retval = 0;
362
363         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
364         data = (struct test_private_data *) channel->private_data;
365         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
366
367         if (data->real)
368                 retval = io_channel_read_blk64(data->real, block, count, buf);
369         if (data->read_blk64)
370                 data->read_blk64(block, count, retval);
371         if (data->flags & TEST_FLAG_READ)
372                 fprintf(data->outfile,
373                         "Test_io: read_blk64(%llu, %d) returned %s\n",
374                         block, count, retval ? error_message(retval) : "OK");
375         if (data->block && data->block == block) {
376                 if (data->flags & TEST_FLAG_DUMP)
377                         test_dump_block(channel, data, block, buf);
378                 if (--data->read_abort_count == 0)
379                         test_abort(channel, block);
380         }
381         return retval;
382 }
383
384 static errcode_t test_write_blk64(io_channel channel, unsigned long long block,
385                                int count, const void *buf)
386 {
387         struct test_private_data *data;
388         errcode_t       retval = 0;
389
390         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
391         data = (struct test_private_data *) channel->private_data;
392         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
393
394         if (data->real)
395                 retval = io_channel_write_blk64(data->real, block, count, buf);
396         if (data->write_blk64)
397                 data->write_blk64(block, count, retval);
398         if (data->flags & TEST_FLAG_WRITE)
399                 fprintf(data->outfile,
400                         "Test_io: write_blk64(%llu, %d) returned %s\n",
401                         block, count, retval ? error_message(retval) : "OK");
402         if (data->block && data->block == block) {
403                 if (data->flags & TEST_FLAG_DUMP)
404                         test_dump_block(channel, data, block, buf);
405                 if (--data->write_abort_count == 0)
406                         test_abort(channel, block);
407         }
408         return retval;
409 }
410
411 static errcode_t test_write_byte(io_channel channel, unsigned long offset,
412                                int count, const void *buf)
413 {
414         struct test_private_data *data;
415         errcode_t       retval = 0;
416
417         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
418         data = (struct test_private_data *) channel->private_data;
419         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
420
421         if (data->real && data->real->manager->write_byte)
422                 retval = io_channel_write_byte(data->real, offset, count, buf);
423         if (data->write_byte)
424                 data->write_byte(offset, count, retval);
425         if (data->flags & TEST_FLAG_WRITE)
426                 fprintf(data->outfile,
427                         "Test_io: write_byte(%lu, %d) returned %s\n",
428                         offset, count, retval ? error_message(retval) : "OK");
429         return retval;
430 }
431
432 static errcode_t test_set_option(io_channel channel, const char *option,
433                                  const char *arg)
434 {
435         struct test_private_data *data;
436         errcode_t       retval = 0;
437
438         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
439         data = (struct test_private_data *) channel->private_data;
440         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
441
442
443         if (data->flags & TEST_FLAG_SET_OPTION)
444                 fprintf(data->outfile, "Test_io: set_option(%s, %s) ",
445                         option, arg);
446         if (data->real && data->real->manager->set_option) {
447                 retval = (data->real->manager->set_option)(data->real,
448                                                            option, arg);
449                 if (data->flags & TEST_FLAG_SET_OPTION)
450                         fprintf(data->outfile, "returned %s\n",
451                                 retval ? error_message(retval) : "OK");
452         } else {
453                 if (data->flags & TEST_FLAG_SET_OPTION)
454                         fprintf(data->outfile, "not implemented\n");
455         }
456         return retval;
457 }
458
459 static errcode_t test_get_stats(io_channel channel, io_stats *stats)
460 {
461         struct test_private_data *data;
462         errcode_t       retval = 0;
463
464         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
465         data = (struct test_private_data *) channel->private_data;
466         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
467
468         if (data->real && data->real->manager->get_stats) {
469                 retval = (data->real->manager->get_stats)(data->real, stats);
470         }
471         return retval;
472 }
473
474 static errcode_t test_discard(io_channel channel, unsigned long long block,
475                               unsigned long long count)
476 {
477         struct test_private_data *data;
478         errcode_t       retval = 0;
479
480         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
481         data = (struct test_private_data *) channel->private_data;
482         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
483
484         if (data->real)
485                 retval = io_channel_discard(data->real, block, count);
486         if (data->flags & TEST_FLAG_DISCARD)
487                 fprintf(data->outfile,
488                         "Test_io: discard(%llu, %llu) returned %s\n",
489                         block, count, retval ? error_message(retval) : "OK");
490         return retval;
491 }
492
493 static errcode_t test_cache_readahead(io_channel channel,
494                                       unsigned long long block,
495                                       unsigned long long count)
496 {
497         struct test_private_data *data;
498         errcode_t       retval = 0;
499
500         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
501         data = (struct test_private_data *) channel->private_data;
502         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
503
504         if (data->real)
505                 retval = io_channel_cache_readahead(data->real, block, count);
506         if (data->flags & TEST_FLAG_READAHEAD)
507                 fprintf(data->outfile,
508                         "Test_io: readahead(%llu, %llu) returned %s\n",
509                         block, count, retval ? error_message(retval) : "OK");
510         return retval;
511 }
512
513 static errcode_t test_zeroout(io_channel channel, unsigned long long block,
514                               unsigned long long count)
515 {
516         struct test_private_data *data;
517         errcode_t       retval = 0;
518
519         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
520         data = (struct test_private_data *) channel->private_data;
521         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
522
523         if (data->real)
524                 retval = io_channel_zeroout(data->real, block, count);
525         if (data->flags & TEST_FLAG_ZEROOUT)
526                 fprintf(data->outfile,
527                         "Test_io: zeroout(%llu, %llu) returned %s\n",
528                         block, count, retval ? error_message(retval) : "OK");
529         return retval;
530 }
531
532 static struct struct_io_manager struct_test_manager = {
533         .magic          = EXT2_ET_MAGIC_IO_MANAGER,
534         .name           = "Test I/O Manager",
535         .open           = test_open,
536         .close          = test_close,
537         .set_blksize    = test_set_blksize,
538         .read_blk       = test_read_blk,
539         .write_blk      = test_write_blk,
540         .flush          = test_flush,
541         .write_byte     = test_write_byte,
542         .set_option     = test_set_option,
543         .get_stats      = test_get_stats,
544         .read_blk64     = test_read_blk64,
545         .write_blk64    = test_write_blk64,
546         .discard        = test_discard,
547         .cache_readahead        = test_cache_readahead,
548         .zeroout        = test_zeroout,
549 };
550
551 io_manager test_io_manager = &struct_test_manager;