Initial public busybox upstream commit
[busybox4maemo] / e2fsprogs / old_e2fsprogs / ext2fs / test_io.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * test_io.c --- This is the Test I/O interface.
4  *
5  * Copyright (C) 1996 Theodore Ts'o.
6  *
7  * %Begin-Header%
8  * This file may be redistributed under the terms of the GNU Public
9  * License.
10  * %End-Header%
11  */
12
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
27 #include "ext2_fs.h"
28 #include "ext2fs.h"
29
30 /*
31  * For checking structure magic numbers...
32  */
33
34 #define EXT2_CHECK_MAGIC(struct, code) \
35           if ((struct)->magic != (code)) return (code)
36
37 struct test_private_data {
38         int     magic;
39         io_channel real;
40         int flags;
41         FILE *outfile;
42         unsigned long block;
43         int read_abort_count, write_abort_count;
44         void (*read_blk)(unsigned long block, int count, errcode_t err);
45         void (*write_blk)(unsigned long block, int count, errcode_t err);
46         void (*set_blksize)(int blksize, errcode_t err);
47         void (*write_byte)(unsigned long block, int count, errcode_t err);
48 };
49
50 static errcode_t test_open(const char *name, int flags, io_channel *channel);
51 static errcode_t test_close(io_channel channel);
52 static errcode_t test_set_blksize(io_channel channel, int blksize);
53 static errcode_t test_read_blk(io_channel channel, unsigned long block,
54                                int count, void *data);
55 static errcode_t test_write_blk(io_channel channel, unsigned long block,
56                                 int count, const void *data);
57 static errcode_t test_flush(io_channel channel);
58 static errcode_t test_write_byte(io_channel channel, unsigned long offset,
59                                  int count, const void *buf);
60 static errcode_t test_set_option(io_channel channel, const char *option,
61                                  const char *arg);
62
63 static struct struct_io_manager struct_test_manager = {
64         EXT2_ET_MAGIC_IO_MANAGER,
65         "Test I/O Manager",
66         test_open,
67         test_close,
68         test_set_blksize,
69         test_read_blk,
70         test_write_blk,
71         test_flush,
72         test_write_byte,
73         test_set_option
74 };
75
76 io_manager test_io_manager = &struct_test_manager;
77
78 /*
79  * These global variable can be set by the test program as
80  * necessary *before* calling test_open
81  */
82 io_manager test_io_backing_manager = 0;
83 void (*test_io_cb_read_blk)
84         (unsigned long block, int count, errcode_t err) = 0;
85 void (*test_io_cb_write_blk)
86         (unsigned long block, int count, errcode_t err) = 0;
87 void (*test_io_cb_set_blksize)
88         (int blksize, errcode_t err) = 0;
89 void (*test_io_cb_write_byte)
90         (unsigned long block, int count, errcode_t err) = 0;
91
92 /*
93  * Test flags
94  */
95 #define TEST_FLAG_READ                  0x01
96 #define TEST_FLAG_WRITE                 0x02
97 #define TEST_FLAG_SET_BLKSIZE           0x04
98 #define TEST_FLAG_FLUSH                 0x08
99 #define TEST_FLAG_DUMP                  0x10
100 #define TEST_FLAG_SET_OPTION            0x20
101
102 static void test_dump_block(io_channel channel,
103                             struct test_private_data *data,
104                             unsigned long block, const void *buf)
105 {
106         const unsigned char *cp;
107         FILE *f = data->outfile;
108         int     i;
109         unsigned long   cksum = 0;
110
111         for (i=0, cp = buf; i < channel->block_size; i++, cp++) {
112                 cksum += *cp;
113         }
114         fprintf(f, "Contents of block %lu, checksum %08lu:\n", block, cksum);
115         for (i=0, cp = buf; i < channel->block_size; i++, cp++) {
116                 if ((i % 16) == 0)
117                         fprintf(f, "%04x: ", i);
118                 fprintf(f, "%02x%c", *cp, ((i % 16) == 15) ? '\n' : ' ');
119         }
120 }
121
122 static void test_abort(io_channel channel, unsigned long block)
123 {
124         struct test_private_data *data;
125         FILE *f;
126
127         data = (struct test_private_data *) channel->private_data;
128         f = data->outfile;
129         test_flush(channel);
130
131         fprintf(f, "Aborting due to I/O to block %lu\n", block);
132         fflush(f);
133         abort();
134 }
135
136 static errcode_t test_open(const char *name, int flags, io_channel *channel)
137 {
138         io_channel      io = NULL;
139         struct test_private_data *data = NULL;
140         errcode_t       retval;
141         char            *value;
142
143         if (name == 0)
144                 return EXT2_ET_BAD_DEVICE_NAME;
145         retval = ext2fs_get_mem(sizeof(struct struct_io_channel), &io);
146         if (retval)
147                 return retval;
148         memset(io, 0, sizeof(struct struct_io_channel));
149         io->magic = EXT2_ET_MAGIC_IO_CHANNEL;
150         retval = ext2fs_get_mem(sizeof(struct test_private_data), &data);
151         if (retval) {
152                 retval = EXT2_ET_NO_MEMORY;
153                 goto cleanup;
154         }
155         io->manager = test_io_manager;
156         retval = ext2fs_get_mem(strlen(name)+1, &io->name);
157         if (retval)
158                 goto cleanup;
159
160         strcpy(io->name, name);
161         io->private_data = data;
162         io->block_size = 1024;
163         io->read_error = 0;
164         io->write_error = 0;
165         io->refcount = 1;
166
167         memset(data, 0, sizeof(struct test_private_data));
168         data->magic = EXT2_ET_MAGIC_TEST_IO_CHANNEL;
169         if (test_io_backing_manager) {
170                 retval = test_io_backing_manager->open(name, flags,
171                                                        &data->real);
172                 if (retval)
173                         goto cleanup;
174         } else
175                 data->real = 0;
176         data->read_blk =        test_io_cb_read_blk;
177         data->write_blk =       test_io_cb_write_blk;
178         data->set_blksize =     test_io_cb_set_blksize;
179         data->write_byte =      test_io_cb_write_byte;
180
181         data->outfile = NULL;
182         if ((value = getenv("TEST_IO_LOGFILE")) != NULL)
183                 data->outfile = fopen(value, "w");
184         if (!data->outfile)
185                 data->outfile = stderr;
186
187         data->flags = 0;
188         if ((value = getenv("TEST_IO_FLAGS")) != NULL)
189                 data->flags = strtoul(value, NULL, 0);
190
191         data->block = 0;
192         if ((value = getenv("TEST_IO_BLOCK")) != NULL)
193                 data->block = strtoul(value, NULL, 0);
194
195         data->read_abort_count = 0;
196         if ((value = getenv("TEST_IO_READ_ABORT")) != NULL)
197                 data->read_abort_count = strtoul(value, NULL, 0);
198
199         data->write_abort_count = 0;
200         if ((value = getenv("TEST_IO_WRITE_ABORT")) != NULL)
201                 data->write_abort_count = strtoul(value, NULL, 0);
202
203         *channel = io;
204         return 0;
205
206 cleanup:
207         ext2fs_free_mem(&io);
208         ext2fs_free_mem(&data);
209         return retval;
210 }
211
212 static errcode_t test_close(io_channel channel)
213 {
214         struct test_private_data *data;
215         errcode_t       retval = 0;
216
217         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
218         data = (struct test_private_data *) channel->private_data;
219         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
220
221         if (--channel->refcount > 0)
222                 return 0;
223
224         if (data->real)
225                 retval = io_channel_close(data->real);
226
227         if (data->outfile && data->outfile != stderr)
228                 fclose(data->outfile);
229
230         ext2fs_free_mem(&channel->private_data);
231         ext2fs_free_mem(&channel->name);
232         ext2fs_free_mem(&channel);
233         return retval;
234 }
235
236 static errcode_t test_set_blksize(io_channel channel, int blksize)
237 {
238         struct test_private_data *data;
239         errcode_t       retval = 0;
240
241         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
242         data = (struct test_private_data *) channel->private_data;
243         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
244
245         if (data->real)
246                 retval = io_channel_set_blksize(data->real, blksize);
247         if (data->set_blksize)
248                 data->set_blksize(blksize, retval);
249         if (data->flags & TEST_FLAG_SET_BLKSIZE)
250                 fprintf(data->outfile,
251                         "Test_io: set_blksize(%d) returned %s\n",
252                         blksize, retval ? error_message(retval) : "OK");
253         channel->block_size = blksize;
254         return retval;
255 }
256
257
258 static errcode_t test_read_blk(io_channel channel, unsigned long block,
259                                int count, void *buf)
260 {
261         struct test_private_data *data;
262         errcode_t       retval = 0;
263
264         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
265         data = (struct test_private_data *) channel->private_data;
266         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
267
268         if (data->real)
269                 retval = io_channel_read_blk(data->real, block, count, buf);
270         if (data->read_blk)
271                 data->read_blk(block, count, retval);
272         if (data->flags & TEST_FLAG_READ)
273                 fprintf(data->outfile,
274                         "Test_io: read_blk(%lu, %d) returned %s\n",
275                         block, count, retval ? error_message(retval) : "OK");
276         if (data->block && data->block == block) {
277                 if (data->flags & TEST_FLAG_DUMP)
278                         test_dump_block(channel, data, block, buf);
279                 if (--data->read_abort_count == 0)
280                         test_abort(channel, block);
281         }
282         return retval;
283 }
284
285 static errcode_t test_write_blk(io_channel channel, unsigned long block,
286                                int count, const void *buf)
287 {
288         struct test_private_data *data;
289         errcode_t       retval = 0;
290
291         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
292         data = (struct test_private_data *) channel->private_data;
293         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
294
295         if (data->real)
296                 retval = io_channel_write_blk(data->real, block, count, buf);
297         if (data->write_blk)
298                 data->write_blk(block, count, retval);
299         if (data->flags & TEST_FLAG_WRITE)
300                 fprintf(data->outfile,
301                         "Test_io: write_blk(%lu, %d) returned %s\n",
302                         block, count, retval ? error_message(retval) : "OK");
303         if (data->block && data->block == block) {
304                 if (data->flags & TEST_FLAG_DUMP)
305                         test_dump_block(channel, data, block, buf);
306                 if (--data->write_abort_count == 0)
307                         test_abort(channel, block);
308         }
309         return retval;
310 }
311
312 static errcode_t test_write_byte(io_channel channel, unsigned long offset,
313                                int count, const void *buf)
314 {
315         struct test_private_data *data;
316         errcode_t       retval = 0;
317
318         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
319         data = (struct test_private_data *) channel->private_data;
320         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
321
322         if (data->real && data->real->manager->write_byte)
323                 retval = io_channel_write_byte(data->real, offset, count, buf);
324         if (data->write_byte)
325                 data->write_byte(offset, count, retval);
326         if (data->flags & TEST_FLAG_WRITE)
327                 fprintf(data->outfile,
328                         "Test_io: write_byte(%lu, %d) returned %s\n",
329                         offset, count, retval ? error_message(retval) : "OK");
330         return retval;
331 }
332
333 /*
334  * Flush data buffers to disk.
335  */
336 static errcode_t test_flush(io_channel channel)
337 {
338         struct test_private_data *data;
339         errcode_t       retval = 0;
340
341         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
342         data = (struct test_private_data *) channel->private_data;
343         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
344
345         if (data->real)
346                 retval = io_channel_flush(data->real);
347
348         if (data->flags & TEST_FLAG_FLUSH)
349                 fprintf(data->outfile, "Test_io: flush() returned %s\n",
350                         retval ? error_message(retval) : "OK");
351
352         return retval;
353 }
354
355 static errcode_t test_set_option(io_channel channel, const char *option,
356                                  const char *arg)
357 {
358         struct test_private_data *data;
359         errcode_t       retval = 0;
360
361         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
362         data = (struct test_private_data *) channel->private_data;
363         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
364
365
366         if (data->flags & TEST_FLAG_SET_OPTION)
367                 fprintf(data->outfile, "Test_io: set_option(%s, %s) ",
368                         option, arg);
369         if (data->real && data->real->manager->set_option) {
370                 retval = (data->real->manager->set_option)(data->real,
371                                                            option, arg);
372                 if (data->flags & TEST_FLAG_SET_OPTION)
373                         fprintf(data->outfile, "returned %s\n",
374                                 retval ? error_message(retval) : "OK");
375         } else {
376                 if (data->flags & TEST_FLAG_SET_OPTION)
377                         fprintf(data->outfile, "not implemented\n");
378         }
379         return retval;
380 }