45f9090cbb6bd849ca9c58573696adc4220c85b1
[platform/upstream/busybox.git] / e2fsprogs / 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 Public
8  * License.
9  * %End-Header%
10  */
11
12 #include <stdio.h>
13 #include <string.h>
14 #if HAVE_UNISTD_H
15 #include <unistd.h>
16 #endif
17 #include <fcntl.h>
18 #include <time.h>
19 #if HAVE_SYS_STAT_H
20 #include <sys/stat.h>
21 #endif
22 #if HAVE_SYS_TYPES_H
23 #include <sys/types.h>
24 #endif
25
26 #include "ext2_fs.h"
27 #include "ext2fs.h"
28
29 /*
30  * For checking structure magic numbers...
31  */
32
33 #define EXT2_CHECK_MAGIC(struct, code) \
34           if ((struct)->magic != (code)) return (code)
35
36 struct test_private_data {
37         int     magic;
38         io_channel real;
39         int flags;
40         FILE *outfile;
41         unsigned long block;
42         int read_abort_count, write_abort_count;
43         void (*read_blk)(unsigned long block, int count, errcode_t err);
44         void (*write_blk)(unsigned long block, int count, errcode_t err);
45         void (*set_blksize)(int blksize, errcode_t err);
46         void (*write_byte)(unsigned long block, int count, errcode_t err);
47 };
48
49 static errcode_t test_open(const char *name, int flags, io_channel *channel);
50 static errcode_t test_close(io_channel channel);
51 static errcode_t test_set_blksize(io_channel channel, int blksize);
52 static errcode_t test_read_blk(io_channel channel, unsigned long block,
53                                int count, void *data);
54 static errcode_t test_write_blk(io_channel channel, unsigned long block,
55                                 int count, const void *data);
56 static errcode_t test_flush(io_channel channel);
57 static errcode_t test_write_byte(io_channel channel, unsigned long offset,
58                                  int count, const void *buf);
59 static errcode_t test_set_option(io_channel channel, const char *option,
60                                  const char *arg);
61
62 static struct struct_io_manager struct_test_manager = {
63         EXT2_ET_MAGIC_IO_MANAGER,
64         "Test I/O Manager",
65         test_open,
66         test_close,
67         test_set_blksize,
68         test_read_blk,
69         test_write_blk,
70         test_flush,
71         test_write_byte,
72         test_set_option
73 };
74
75 io_manager test_io_manager = &struct_test_manager;
76
77 /*
78  * These global variable can be set by the test program as
79  * necessary *before* calling test_open
80  */
81 io_manager test_io_backing_manager = 0;
82 void (*test_io_cb_read_blk)
83         (unsigned long block, int count, errcode_t err) = 0;
84 void (*test_io_cb_write_blk)
85         (unsigned long block, int count, errcode_t err) = 0;
86 void (*test_io_cb_set_blksize)
87         (int blksize, errcode_t err) = 0;
88 void (*test_io_cb_write_byte)
89         (unsigned long block, int count, errcode_t err) = 0;
90
91 /*
92  * Test flags
93  */
94 #define TEST_FLAG_READ                  0x01
95 #define TEST_FLAG_WRITE                 0x02
96 #define TEST_FLAG_SET_BLKSIZE           0x04
97 #define TEST_FLAG_FLUSH                 0x08
98 #define TEST_FLAG_DUMP                  0x10
99 #define TEST_FLAG_SET_OPTION            0x20
100
101 static void test_dump_block(io_channel channel,
102                             struct test_private_data *data,
103                             unsigned long block, const void *buf)
104 {
105         const unsigned char *cp;
106         FILE *f = data->outfile;
107         int     i;
108         unsigned long   cksum = 0;
109
110         for (i=0, cp = buf; i < channel->block_size; i++, cp++) {
111                 cksum += *cp;
112         }
113         fprintf(f, "Contents of block %lu, checksum %08lu: \n", block, cksum);
114         for (i=0, cp = buf; i < channel->block_size; i++, cp++) {
115                 if ((i % 16) == 0)
116                         fprintf(f, "%04x: ", i);
117                 fprintf(f, "%02x%c", *cp, ((i % 16) == 15) ? '\n' : ' ');
118         }
119 }
120
121 static void test_abort(io_channel channel, unsigned long block)
122 {
123         struct test_private_data *data;
124         FILE *f;
125
126         data = (struct test_private_data *) channel->private_data;
127         f = data->outfile;
128         test_flush(channel);
129
130         fprintf(f, "Aborting due to I/O to block %lu\n", block);
131         fflush(f);
132         abort();
133 }
134
135 static errcode_t test_open(const char *name, int flags, io_channel *channel)
136 {
137         io_channel      io = NULL;
138         struct test_private_data *data = NULL;
139         errcode_t       retval;
140         char            *value;
141
142         if (name == 0)
143                 return EXT2_ET_BAD_DEVICE_NAME;
144         retval = ext2fs_get_mem(sizeof(struct struct_io_channel), &io);
145         if (retval)
146                 return retval;
147         memset(io, 0, sizeof(struct struct_io_channel));
148         io->magic = EXT2_ET_MAGIC_IO_CHANNEL;
149         retval = ext2fs_get_mem(sizeof(struct test_private_data), &data);
150         if (retval) {
151                 retval = EXT2_ET_NO_MEMORY;
152                 goto cleanup;
153         }
154         io->manager = test_io_manager;
155         retval = ext2fs_get_mem(strlen(name)+1, &io->name);
156         if (retval)
157                 goto cleanup;
158
159         strcpy(io->name, name);
160         io->private_data = data;
161         io->block_size = 1024;
162         io->read_error = 0;
163         io->write_error = 0;
164         io->refcount = 1;
165
166         memset(data, 0, sizeof(struct test_private_data));
167         data->magic = EXT2_ET_MAGIC_TEST_IO_CHANNEL;
168         if (test_io_backing_manager) {
169                 retval = test_io_backing_manager->open(name, flags,
170                                                        &data->real);
171                 if (retval)
172                         goto cleanup;
173         } else
174                 data->real = 0;
175         data->read_blk =        test_io_cb_read_blk;
176         data->write_blk =       test_io_cb_write_blk;
177         data->set_blksize =     test_io_cb_set_blksize;
178         data->write_byte =      test_io_cb_write_byte;
179
180         data->outfile = NULL;
181         if ((value = getenv("TEST_IO_LOGFILE")) != NULL)
182                 data->outfile = fopen(value, "w");
183         if (!data->outfile)
184                 data->outfile = stderr;
185
186         data->flags = 0;
187         if ((value = getenv("TEST_IO_FLAGS")) != NULL)
188                 data->flags = strtoul(value, NULL, 0);
189
190         data->block = 0;
191         if ((value = getenv("TEST_IO_BLOCK")) != NULL)
192                 data->block = strtoul(value, NULL, 0);
193
194         data->read_abort_count = 0;
195         if ((value = getenv("TEST_IO_READ_ABORT")) != NULL)
196                 data->read_abort_count = strtoul(value, NULL, 0);
197
198         data->write_abort_count = 0;
199         if ((value = getenv("TEST_IO_WRITE_ABORT")) != NULL)
200                 data->write_abort_count = strtoul(value, NULL, 0);
201
202         *channel = io;
203         return 0;
204
205 cleanup:
206         ext2fs_free_mem(&io);
207         ext2fs_free_mem(&data);
208         return retval;
209 }
210
211 static errcode_t test_close(io_channel channel)
212 {
213         struct test_private_data *data;
214         errcode_t       retval = 0;
215
216         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
217         data = (struct test_private_data *) channel->private_data;
218         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
219
220         if (--channel->refcount > 0)
221                 return 0;
222
223         if (data->real)
224                 retval = io_channel_close(data->real);
225
226         if (data->outfile && data->outfile != stderr)
227                 fclose(data->outfile);
228
229         ext2fs_free_mem(&channel->private_data);
230         ext2fs_free_mem(&channel->name);
231         ext2fs_free_mem(&channel);
232         return retval;
233 }
234
235 static errcode_t test_set_blksize(io_channel channel, int blksize)
236 {
237         struct test_private_data *data;
238         errcode_t       retval = 0;
239
240         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
241         data = (struct test_private_data *) channel->private_data;
242         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
243
244         if (data->real)
245                 retval = io_channel_set_blksize(data->real, blksize);
246         if (data->set_blksize)
247                 data->set_blksize(blksize, retval);
248         if (data->flags & TEST_FLAG_SET_BLKSIZE)
249                 fprintf(data->outfile,
250                         "Test_io: set_blksize(%d) returned %s\n",
251                         blksize, retval ? error_message(retval) : "OK");
252         channel->block_size = blksize;
253         return retval;
254 }
255
256
257 static errcode_t test_read_blk(io_channel channel, unsigned long block,
258                                int count, void *buf)
259 {
260         struct test_private_data *data;
261         errcode_t       retval = 0;
262
263         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
264         data = (struct test_private_data *) channel->private_data;
265         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
266
267         if (data->real)
268                 retval = io_channel_read_blk(data->real, block, count, buf);
269         if (data->read_blk)
270                 data->read_blk(block, count, retval);
271         if (data->flags & TEST_FLAG_READ)
272                 fprintf(data->outfile,
273                         "Test_io: read_blk(%lu, %d) returned %s\n",
274                         block, count, retval ? error_message(retval) : "OK");
275         if (data->block && data->block == block) {
276                 if (data->flags & TEST_FLAG_DUMP)
277                         test_dump_block(channel, data, block, buf);
278                 if (--data->read_abort_count == 0)
279                         test_abort(channel, block);
280         }
281         return retval;
282 }
283
284 static errcode_t test_write_blk(io_channel channel, unsigned long block,
285                                int count, const void *buf)
286 {
287         struct test_private_data *data;
288         errcode_t       retval = 0;
289
290         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
291         data = (struct test_private_data *) channel->private_data;
292         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
293
294         if (data->real)
295                 retval = io_channel_write_blk(data->real, block, count, buf);
296         if (data->write_blk)
297                 data->write_blk(block, count, retval);
298         if (data->flags & TEST_FLAG_WRITE)
299                 fprintf(data->outfile,
300                         "Test_io: write_blk(%lu, %d) returned %s\n",
301                         block, count, retval ? error_message(retval) : "OK");
302         if (data->block && data->block == block) {
303                 if (data->flags & TEST_FLAG_DUMP)
304                         test_dump_block(channel, data, block, buf);
305                 if (--data->write_abort_count == 0)
306                         test_abort(channel, block);
307         }
308         return retval;
309 }
310
311 static errcode_t test_write_byte(io_channel channel, unsigned long offset,
312                                int count, const void *buf)
313 {
314         struct test_private_data *data;
315         errcode_t       retval = 0;
316
317         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
318         data = (struct test_private_data *) channel->private_data;
319         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
320
321         if (data->real && data->real->manager->write_byte)
322                 retval = io_channel_write_byte(data->real, offset, count, buf);
323         if (data->write_byte)
324                 data->write_byte(offset, count, retval);
325         if (data->flags & TEST_FLAG_WRITE)
326                 fprintf(data->outfile,
327                         "Test_io: write_byte(%lu, %d) returned %s\n",
328                         offset, count, retval ? error_message(retval) : "OK");
329         return retval;
330 }
331
332 /*
333  * Flush data buffers to disk.
334  */
335 static errcode_t test_flush(io_channel channel)
336 {
337         struct test_private_data *data;
338         errcode_t       retval = 0;
339
340         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
341         data = (struct test_private_data *) channel->private_data;
342         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
343
344         if (data->real)
345                 retval = io_channel_flush(data->real);
346
347         if (data->flags & TEST_FLAG_FLUSH)
348                 fprintf(data->outfile, "Test_io: flush() returned %s\n",
349                         retval ? error_message(retval) : "OK");
350
351         return retval;
352 }
353
354 static errcode_t test_set_option(io_channel channel, const char *option,
355                                  const char *arg)
356 {
357         struct test_private_data *data;
358         errcode_t       retval = 0;
359
360         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
361         data = (struct test_private_data *) channel->private_data;
362         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
363
364
365         if (data->flags & TEST_FLAG_SET_OPTION)
366                 fprintf(data->outfile, "Test_io: set_option(%s, %s) ",
367                         option, arg);
368         if (data->real && data->real->manager->set_option) {
369                 retval = (data->real->manager->set_option)(data->real,
370                                                            option, arg);
371                 if (data->flags & TEST_FLAG_SET_OPTION)
372                         fprintf(data->outfile, "returned %s\n",
373                                 retval ? error_message(retval) : "OK");
374         } else {
375                 if (data->flags & TEST_FLAG_SET_OPTION)
376                         fprintf(data->outfile, "not implemented\n");
377         }
378         return retval;
379 }