source: MondoRescue/branches/stable/mindi-busybox/e2fsprogs/ext2fs/test_io.c@ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 18 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)
File size: 10.2 KB
Line 
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
36struct 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
49static errcode_t test_open(const char *name, int flags, io_channel *channel);
50static errcode_t test_close(io_channel channel);
51static errcode_t test_set_blksize(io_channel channel, int blksize);
52static errcode_t test_read_blk(io_channel channel, unsigned long block,
53 int count, void *data);
54static errcode_t test_write_blk(io_channel channel, unsigned long block,
55 int count, const void *data);
56static errcode_t test_flush(io_channel channel);
57static errcode_t test_write_byte(io_channel channel, unsigned long offset,
58 int count, const void *buf);
59static errcode_t test_set_option(io_channel channel, const char *option,
60 const char *arg);
61
62static 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
75io_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 */
81io_manager test_io_backing_manager = 0;
82void (*test_io_cb_read_blk)
83 (unsigned long block, int count, errcode_t err) = 0;
84void (*test_io_cb_write_blk)
85 (unsigned long block, int count, errcode_t err) = 0;
86void (*test_io_cb_set_blksize)
87 (int blksize, errcode_t err) = 0;
88void (*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
101static 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
121static 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
135static 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
205cleanup:
206 ext2fs_free_mem(&io);
207 ext2fs_free_mem(&data);
208 return retval;
209}
210
211static 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
235static 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
257static 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
284static 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
311static 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 */
335static 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
354static 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}
Note: See TracBrowser for help on using the repository browser.