[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * test_io.c --- This is the Test I/O interface.
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| 4 | *
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| 5 | * Copyright (C) 1996 Theodore Ts'o.
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| 6 | *
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| 7 | * %Begin-Header%
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| 8 | * This file may be redistributed under the terms of the GNU Public
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| 9 | * License.
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| 10 | * %End-Header%
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| 11 | */
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| 12 |
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| 13 | #include <stdio.h>
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| 14 | #include <string.h>
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| 15 | #if HAVE_UNISTD_H
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| 16 | #include <unistd.h>
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| 17 | #endif
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| 18 | #include <fcntl.h>
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| 19 | #include <time.h>
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| 20 | #if HAVE_SYS_STAT_H
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| 21 | #include <sys/stat.h>
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| 22 | #endif
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| 23 | #if HAVE_SYS_TYPES_H
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| 24 | #include <sys/types.h>
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| 25 | #endif
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| 26 |
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| 27 | #include "ext2_fs.h"
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| 28 | #include "ext2fs.h"
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| 29 |
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| 30 | /*
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| 31 | * For checking structure magic numbers...
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| 32 | */
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| 33 |
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| 34 | #define EXT2_CHECK_MAGIC(struct, code) \
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| 35 | if ((struct)->magic != (code)) return (code)
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| 36 |
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| 37 | struct test_private_data {
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| 38 | int magic;
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| 39 | io_channel real;
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| 40 | int flags;
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| 41 | FILE *outfile;
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| 42 | unsigned long block;
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| 43 | int read_abort_count, write_abort_count;
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| 44 | void (*read_blk)(unsigned long block, int count, errcode_t err);
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| 45 | void (*write_blk)(unsigned long block, int count, errcode_t err);
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| 46 | void (*set_blksize)(int blksize, errcode_t err);
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| 47 | void (*write_byte)(unsigned long block, int count, errcode_t err);
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| 48 | };
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| 49 |
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| 50 | static errcode_t test_open(const char *name, int flags, io_channel *channel);
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| 51 | static errcode_t test_close(io_channel channel);
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| 52 | static errcode_t test_set_blksize(io_channel channel, int blksize);
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| 53 | static errcode_t test_read_blk(io_channel channel, unsigned long block,
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| 54 | int count, void *data);
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| 55 | static errcode_t test_write_blk(io_channel channel, unsigned long block,
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| 56 | int count, const void *data);
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| 57 | static errcode_t test_flush(io_channel channel);
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| 58 | static errcode_t test_write_byte(io_channel channel, unsigned long offset,
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| 59 | int count, const void *buf);
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| 60 | static errcode_t test_set_option(io_channel channel, const char *option,
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| 61 | const char *arg);
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| 62 |
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| 63 | static struct struct_io_manager struct_test_manager = {
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| 64 | EXT2_ET_MAGIC_IO_MANAGER,
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| 65 | "Test I/O Manager",
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| 66 | test_open,
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| 67 | test_close,
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| 68 | test_set_blksize,
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| 69 | test_read_blk,
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| 70 | test_write_blk,
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| 71 | test_flush,
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| 72 | test_write_byte,
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| 73 | test_set_option
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| 74 | };
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| 75 |
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| 76 | io_manager test_io_manager = &struct_test_manager;
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| 77 |
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| 78 | /*
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| 79 | * These global variable can be set by the test program as
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| 80 | * necessary *before* calling test_open
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| 81 | */
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| 82 | io_manager test_io_backing_manager = 0;
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| 83 | void (*test_io_cb_read_blk)
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| 84 | (unsigned long block, int count, errcode_t err) = 0;
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| 85 | void (*test_io_cb_write_blk)
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| 86 | (unsigned long block, int count, errcode_t err) = 0;
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| 87 | void (*test_io_cb_set_blksize)
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| 88 | (int blksize, errcode_t err) = 0;
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| 89 | void (*test_io_cb_write_byte)
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| 90 | (unsigned long block, int count, errcode_t err) = 0;
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| 91 |
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| 92 | /*
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| 93 | * Test flags
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| 94 | */
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| 95 | #define TEST_FLAG_READ 0x01
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| 96 | #define TEST_FLAG_WRITE 0x02
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| 97 | #define TEST_FLAG_SET_BLKSIZE 0x04
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| 98 | #define TEST_FLAG_FLUSH 0x08
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| 99 | #define TEST_FLAG_DUMP 0x10
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| 100 | #define TEST_FLAG_SET_OPTION 0x20
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| 101 |
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| 102 | static void test_dump_block(io_channel channel,
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| 103 | struct test_private_data *data,
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| 104 | unsigned long block, const void *buf)
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| 105 | {
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| 106 | const unsigned char *cp;
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| 107 | FILE *f = data->outfile;
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| 108 | int i;
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| 109 | unsigned long cksum = 0;
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| 110 |
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| 111 | for (i=0, cp = buf; i < channel->block_size; i++, cp++) {
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| 112 | cksum += *cp;
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| 113 | }
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| 114 | fprintf(f, "Contents of block %lu, checksum %08lu:\n", block, cksum);
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| 115 | for (i=0, cp = buf; i < channel->block_size; i++, cp++) {
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| 116 | if ((i % 16) == 0)
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| 117 | fprintf(f, "%04x: ", i);
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| 118 | fprintf(f, "%02x%c", *cp, ((i % 16) == 15) ? '\n' : ' ');
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| 119 | }
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| 120 | }
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| 121 |
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| 122 | static void test_abort(io_channel channel, unsigned long block)
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| 123 | {
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| 124 | struct test_private_data *data;
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| 125 | FILE *f;
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| 126 |
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| 127 | data = (struct test_private_data *) channel->private_data;
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| 128 | f = data->outfile;
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| 129 | test_flush(channel);
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| 130 |
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| 131 | fprintf(f, "Aborting due to I/O to block %lu\n", block);
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| 132 | fflush(f);
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| 133 | abort();
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| 134 | }
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| 135 |
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| 136 | static errcode_t test_open(const char *name, int flags, io_channel *channel)
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| 137 | {
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| 138 | io_channel io = NULL;
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| 139 | struct test_private_data *data = NULL;
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| 140 | errcode_t retval;
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| 141 | char *value;
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| 142 |
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| 143 | if (name == 0)
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| 144 | return EXT2_ET_BAD_DEVICE_NAME;
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| 145 | retval = ext2fs_get_mem(sizeof(struct struct_io_channel), &io);
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| 146 | if (retval)
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| 147 | return retval;
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| 148 | memset(io, 0, sizeof(struct struct_io_channel));
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| 149 | io->magic = EXT2_ET_MAGIC_IO_CHANNEL;
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| 150 | retval = ext2fs_get_mem(sizeof(struct test_private_data), &data);
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| 151 | if (retval) {
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| 152 | retval = EXT2_ET_NO_MEMORY;
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| 153 | goto cleanup;
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| 154 | }
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| 155 | io->manager = test_io_manager;
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| 156 | retval = ext2fs_get_mem(strlen(name)+1, &io->name);
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| 157 | if (retval)
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| 158 | goto cleanup;
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| 159 |
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| 160 | strcpy(io->name, name);
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| 161 | io->private_data = data;
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| 162 | io->block_size = 1024;
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| 163 | io->read_error = 0;
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| 164 | io->write_error = 0;
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| 165 | io->refcount = 1;
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| 166 |
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| 167 | memset(data, 0, sizeof(struct test_private_data));
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| 168 | data->magic = EXT2_ET_MAGIC_TEST_IO_CHANNEL;
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| 169 | if (test_io_backing_manager) {
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| 170 | retval = test_io_backing_manager->open(name, flags,
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| 171 | &data->real);
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| 172 | if (retval)
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| 173 | goto cleanup;
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| 174 | } else
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| 175 | data->real = 0;
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| 176 | data->read_blk = test_io_cb_read_blk;
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| 177 | data->write_blk = test_io_cb_write_blk;
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| 178 | data->set_blksize = test_io_cb_set_blksize;
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| 179 | data->write_byte = test_io_cb_write_byte;
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| 180 |
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| 181 | data->outfile = NULL;
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| 182 | if ((value = getenv("TEST_IO_LOGFILE")) != NULL)
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| 183 | data->outfile = fopen_for_write(value);
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| 184 | if (!data->outfile)
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| 185 | data->outfile = stderr;
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| 186 |
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| 187 | data->flags = 0;
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| 188 | if ((value = getenv("TEST_IO_FLAGS")) != NULL)
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| 189 | data->flags = strtoul(value, NULL, 0);
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| 190 |
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| 191 | data->block = 0;
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| 192 | if ((value = getenv("TEST_IO_BLOCK")) != NULL)
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| 193 | data->block = strtoul(value, NULL, 0);
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| 194 |
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| 195 | data->read_abort_count = 0;
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| 196 | if ((value = getenv("TEST_IO_READ_ABORT")) != NULL)
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| 197 | data->read_abort_count = strtoul(value, NULL, 0);
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| 198 |
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| 199 | data->write_abort_count = 0;
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| 200 | if ((value = getenv("TEST_IO_WRITE_ABORT")) != NULL)
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| 201 | data->write_abort_count = strtoul(value, NULL, 0);
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| 202 |
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| 203 | *channel = io;
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| 204 | return 0;
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| 205 |
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| 206 | cleanup:
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| 207 | ext2fs_free_mem(&io);
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| 208 | ext2fs_free_mem(&data);
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| 209 | return retval;
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| 210 | }
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| 211 |
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| 212 | static errcode_t test_close(io_channel channel)
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| 213 | {
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| 214 | struct test_private_data *data;
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| 215 | errcode_t retval = 0;
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| 216 |
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| 217 | EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
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| 218 | data = (struct test_private_data *) channel->private_data;
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| 219 | EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
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| 220 |
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| 221 | if (--channel->refcount > 0)
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| 222 | return 0;
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| 223 |
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| 224 | if (data->real)
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| 225 | retval = io_channel_close(data->real);
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| 226 |
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| 227 | if (data->outfile && data->outfile != stderr)
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| 228 | fclose(data->outfile);
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| 229 |
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| 230 | ext2fs_free_mem(&channel->private_data);
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| 231 | ext2fs_free_mem(&channel->name);
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| 232 | ext2fs_free_mem(&channel);
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| 233 | return retval;
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| 234 | }
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| 235 |
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| 236 | static errcode_t test_set_blksize(io_channel channel, int blksize)
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| 237 | {
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| 238 | struct test_private_data *data;
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| 239 | errcode_t retval = 0;
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| 240 |
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| 241 | EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
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| 242 | data = (struct test_private_data *) channel->private_data;
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| 243 | EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
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| 244 |
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| 245 | if (data->real)
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| 246 | retval = io_channel_set_blksize(data->real, blksize);
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| 247 | if (data->set_blksize)
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| 248 | data->set_blksize(blksize, retval);
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| 249 | if (data->flags & TEST_FLAG_SET_BLKSIZE)
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| 250 | fprintf(data->outfile,
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| 251 | "Test_io: set_blksize(%d) returned %s\n",
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| 252 | blksize, retval ? error_message(retval) : "OK");
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| 253 | channel->block_size = blksize;
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| 254 | return retval;
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| 255 | }
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| 256 |
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| 257 |
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| 258 | static errcode_t test_read_blk(io_channel channel, unsigned long block,
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| 259 | int count, void *buf)
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| 260 | {
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| 261 | struct test_private_data *data;
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| 262 | errcode_t retval = 0;
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| 263 |
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| 264 | EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
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| 265 | data = (struct test_private_data *) channel->private_data;
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| 266 | EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
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| 267 |
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| 268 | if (data->real)
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| 269 | retval = io_channel_read_blk(data->real, block, count, buf);
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| 270 | if (data->read_blk)
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| 271 | data->read_blk(block, count, retval);
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| 272 | if (data->flags & TEST_FLAG_READ)
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| 273 | fprintf(data->outfile,
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| 274 | "Test_io: read_blk(%lu, %d) returned %s\n",
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| 275 | block, count, retval ? error_message(retval) : "OK");
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| 276 | if (data->block && data->block == block) {
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| 277 | if (data->flags & TEST_FLAG_DUMP)
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| 278 | test_dump_block(channel, data, block, buf);
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| 279 | if (--data->read_abort_count == 0)
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| 280 | test_abort(channel, block);
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| 281 | }
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| 282 | return retval;
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| 283 | }
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| 284 |
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| 285 | static errcode_t test_write_blk(io_channel channel, unsigned long block,
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| 286 | int count, const void *buf)
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| 287 | {
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| 288 | struct test_private_data *data;
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| 289 | errcode_t retval = 0;
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| 290 |
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| 291 | EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
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| 292 | data = (struct test_private_data *) channel->private_data;
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| 293 | EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
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| 294 |
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| 295 | if (data->real)
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| 296 | retval = io_channel_write_blk(data->real, block, count, buf);
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| 297 | if (data->write_blk)
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| 298 | data->write_blk(block, count, retval);
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| 299 | if (data->flags & TEST_FLAG_WRITE)
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| 300 | fprintf(data->outfile,
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| 301 | "Test_io: write_blk(%lu, %d) returned %s\n",
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| 302 | block, count, retval ? error_message(retval) : "OK");
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| 303 | if (data->block && data->block == block) {
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| 304 | if (data->flags & TEST_FLAG_DUMP)
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| 305 | test_dump_block(channel, data, block, buf);
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| 306 | if (--data->write_abort_count == 0)
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| 307 | test_abort(channel, block);
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| 308 | }
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| 309 | return retval;
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| 310 | }
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| 311 |
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| 312 | static errcode_t test_write_byte(io_channel channel, unsigned long offset,
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| 313 | int count, const void *buf)
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| 314 | {
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| 315 | struct test_private_data *data;
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| 316 | errcode_t retval = 0;
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| 317 |
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| 318 | EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
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| 319 | data = (struct test_private_data *) channel->private_data;
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| 320 | EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
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| 321 |
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| 322 | if (data->real && data->real->manager->write_byte)
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| 323 | retval = io_channel_write_byte(data->real, offset, count, buf);
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| 324 | if (data->write_byte)
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| 325 | data->write_byte(offset, count, retval);
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| 326 | if (data->flags & TEST_FLAG_WRITE)
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| 327 | fprintf(data->outfile,
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| 328 | "Test_io: write_byte(%lu, %d) returned %s\n",
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| 329 | offset, count, retval ? error_message(retval) : "OK");
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| 330 | return retval;
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| 331 | }
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| 332 |
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| 333 | /*
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| 334 | * Flush data buffers to disk.
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| 335 | */
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| 336 | static errcode_t test_flush(io_channel channel)
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| 337 | {
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| 338 | struct test_private_data *data;
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| 339 | errcode_t retval = 0;
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| 340 |
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| 341 | EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
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| 342 | data = (struct test_private_data *) channel->private_data;
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| 343 | EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
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| 344 |
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| 345 | if (data->real)
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| 346 | retval = io_channel_flush(data->real);
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| 347 |
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| 348 | if (data->flags & TEST_FLAG_FLUSH)
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| 349 | fprintf(data->outfile, "Test_io: flush() returned %s\n",
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| 350 | retval ? error_message(retval) : "OK");
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| 351 |
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| 352 | return retval;
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| 353 | }
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| 354 |
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| 355 | static errcode_t test_set_option(io_channel channel, const char *option,
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| 356 | const char *arg)
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| 357 | {
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| 358 | struct test_private_data *data;
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| 359 | errcode_t retval = 0;
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| 360 |
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| 361 | EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
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| 362 | data = (struct test_private_data *) channel->private_data;
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| 363 | EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
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| 364 |
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| 365 |
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| 366 | if (data->flags & TEST_FLAG_SET_OPTION)
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| 367 | fprintf(data->outfile, "Test_io: set_option(%s, %s) ",
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| 368 | option, arg);
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| 369 | if (data->real && data->real->manager->set_option) {
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| 370 | retval = (data->real->manager->set_option)(data->real,
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| 371 | option, arg);
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| 372 | if (data->flags & TEST_FLAG_SET_OPTION)
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| 373 | fprintf(data->outfile, "returned %s\n",
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| 374 | retval ? error_message(retval) : "OK");
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| 375 | } else {
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| 376 | if (data->flags & TEST_FLAG_SET_OPTION)
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| 377 | fprintf(data->outfile, "not implemented\n");
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| 378 | }
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| 379 | return retval;
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| 380 | }
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