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 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 #if EXT2_FLAT_INCLUDES
  27 #include "ext2_fs.h"
  28 #else
  29 #include <linux/ext2_fs.h>
  30 #endif
  31
  32 #include "ext2fs.h"
  33
  34 /*
  35  * For checking structure magic numbers...
  36  */
  37
  38 #define EXT2_CHECK_MAGIC(struct, code) \
  39           if ((struct)->magic != (code)) return (code)
  40
  41 struct test_private_data {
  42         int     magic;
  43         io_channel real;
  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 };
  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
  58 static struct struct_io_manager struct_test_manager = {
  59         EXT2_ET_MAGIC_IO_MANAGER,
  60         "Test I/O Manager",
  61         test_open,
  62         test_close,
  63         test_set_blksize,
  64         test_read_blk,
  65         test_write_blk,
  66         test_flush
  67 };
  68
  69 io_manager test_io_manager = &struct_test_manager;
  70
  71 /*
  72  * These global variable can be set by the test program as
  73  * necessary *before* calling test_open
  74  */
  75 io_manager test_io_backing_manager = 0;
  76 void (*test_io_cb_read_blk)
  77         (unsigned long block, int count, errcode_t err) = 0;
  78 void (*test_io_cb_write_blk)
  79         (unsigned long block, int count, errcode_t err) = 0;
  80 void (*test_io_cb_set_blksize)
  81         (int blksize, errcode_t err) = 0;
  82
  83 static errcode_t test_open(const char *name, int flags, io_channel *channel)
  84 {
  85         io_channel      io = NULL;
  86         struct test_private_data *data = NULL;
  87         errcode_t       retval;
  88
  89         if (name == 0)
  90                 return EXT2_ET_BAD_DEVICE_NAME;
  91         retval = ext2fs_get_mem(sizeof(struct struct_io_channel),
  92                                 (void **) &io);
  93         if (retval)
  94                 return retval;
  95         memset(io, 0, sizeof(struct struct_io_channel));
  96         io->magic = EXT2_ET_MAGIC_IO_CHANNEL;
  97         retval = ext2fs_get_mem(sizeof(struct test_private_data),
  98                                 (void **) &data);
  99         if (retval) {
 100                 retval = EXT2_ET_NO_MEMORY;
 101                 goto cleanup;
 102         }
 103         io->manager = test_io_manager;
 104         retval = ext2fs_get_mem(strlen(name)+1, (void **) &io->name);
 105         if (retval)
 106                 goto cleanup;
 107
 108         strcpy(io->name, name);
 109         io->private_data = data;
 110         io->block_size = 1024;
 111         io->read_error = 0;
 112         io->write_error = 0;
 113         io->refcount = 1;
 114
 115         memset(data, 0, sizeof(struct test_private_data));
 116         data->magic = EXT2_ET_MAGIC_TEST_IO_CHANNEL;
 117         if (test_io_backing_manager) {
 118                 retval = test_io_backing_manager->open(name, flags,
 119                                                        &data->real);
 120                 if (retval)
 121                         goto cleanup;
 122         } else
 123                 data->real = 0;
 124         data->read_blk =        test_io_cb_read_blk;
 125         data->write_blk =       test_io_cb_write_blk;
 126         data->set_blksize =     test_io_cb_set_blksize;
 127
 128         *channel = io;
 129         return 0;
 130
 131 cleanup:
 132         if (io)
 133                 ext2fs_free_mem((void **) &io);
 134         if (data)
 135                 ext2fs_free_mem((void **) &data);
 136         return retval;
 137 }
 138
 139 static errcode_t test_close(io_channel channel)
 140 {
 141         struct test_private_data *data;
 142         errcode_t       retval = 0;
 143
 144         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
 145         data = (struct test_private_data *) channel->private_data;
 146         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
 147
 148         if (--channel->refcount > 0)
 149                 return 0;
 150
 151         if (data->real)
 152                 retval = io_channel_close(data->real);
 153
 154         if (channel->private_data)
 155                 ext2fs_free_mem((void **) &channel->private_data);
 156         if (channel->name)
 157                 ext2fs_free_mem((void **) &channel->name);
 158         ext2fs_free_mem((void **) &channel);
 159         return retval;
 160 }
 161
 162 static errcode_t test_set_blksize(io_channel channel, int blksize)
 163 {
 164         struct test_private_data *data;
 165         errcode_t       retval = 0;
 166
 167         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
 168         data = (struct test_private_data *) channel->private_data;
 169         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
 170
 171         if (data->real)
 172                 retval = io_channel_set_blksize(data->real, blksize);
 173         if (data->set_blksize)
 174                 data->set_blksize(blksize, retval);
 175         else
 176                 printf("Test_io: set_blksize(%d) returned %s\n",
 177                        blksize, retval ? error_message(retval) : "OK");
 178         return retval;
 179 }
 180
 181
 182 static errcode_t test_read_blk(io_channel channel, unsigned long block,
 183                                int count, void *buf)
 184 {
 185         struct test_private_data *data;
 186         errcode_t       retval = 0;
 187
 188         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
 189         data = (struct test_private_data *) channel->private_data;
 190         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
 191
 192         if (data->real)
 193                 retval = io_channel_read_blk(data->real, block, count, buf);
 194         if (data->read_blk)
 195                 data->read_blk(block, count, retval);
 196         else
 197                 printf("Test_io: read_blk(%lu, %d) returned %s\n",
 198                        block, count, retval ? error_message(retval) : "OK");
 199         return retval;
 200 }
 201
 202 static errcode_t test_write_blk(io_channel channel, unsigned long block,
 203                                int count, const void *buf)
 204 {
 205         struct test_private_data *data;
 206         errcode_t       retval = 0;
 207
 208         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
 209         data = (struct test_private_data *) channel->private_data;
 210         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
 211
 212         if (data->real)
 213                 retval = io_channel_write_blk(data->real, block, count, buf);
 214         if (data->write_blk)
 215                 data->write_blk(block, count, retval);
 216         else
 217                 printf("Test_io: write_blk(%lu, %d) returned %s\n",
 218                        block, count, retval ? error_message(retval) : "OK");
 219         return retval;
 220 }
 221
 222 /*
 223  * Flush data buffers to disk.
 224  */
 225 static errcode_t test_flush(io_channel channel)
 226 {
 227         struct test_private_data *data;
 228         errcode_t       retval = 0;
 229
 230         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
 231         data = (struct test_private_data *) channel->private_data;
 232         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
 233
 234         if (data->real)
 235                 retval = io_channel_flush(data->real);
 236
 237         printf("Test_io: flush() returned %s\n",
 238                        retval ? error_message(retval) : "OK");
 239
 240         return retval;
 241 }
 242