1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup rtems_ramdisk |
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5 | * |
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6 | * @brief RAM disk block device implementation. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia |
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11 | * Author: Victor V. Vengerov <vvv@oktet.ru> |
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12 | */ |
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13 | |
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14 | #ifdef HAVE_CONFIG_H |
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15 | #include "config.h" |
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16 | #endif |
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17 | |
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18 | #include <stdlib.h> |
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19 | |
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20 | #include <rtems.h> |
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21 | #include <rtems/libio.h> |
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22 | #include <rtems/ramdisk.h> |
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23 | |
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24 | rtems_device_driver |
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25 | ramdisk_initialize( |
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26 | rtems_device_major_number major, |
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27 | rtems_device_minor_number minor __attribute__((unused)), |
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28 | void *arg __attribute__((unused))) |
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29 | { |
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30 | rtems_device_minor_number i; |
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31 | rtems_ramdisk_config *c = rtems_ramdisk_configuration; |
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32 | struct ramdisk *r; |
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33 | rtems_status_code rc; |
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34 | |
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35 | rc = rtems_disk_io_initialize(); |
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36 | if (rc != RTEMS_SUCCESSFUL) |
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37 | return rc; |
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38 | |
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39 | /* |
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40 | * Coverity Id 27 notes that this calloc() is a resource leak. |
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41 | * |
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42 | * This is allocating memory for a RAM disk which will persist for |
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43 | * the life of the system. RTEMS has no "de-initialize" driver call |
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44 | * so there is no corresponding free(r). Coverity is correct that |
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45 | * it is never freed but this is not a problem. |
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46 | */ |
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47 | r = calloc(rtems_ramdisk_configuration_size, sizeof(struct ramdisk)); |
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48 | r->trace = false; |
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49 | for (i = 0; i < rtems_ramdisk_configuration_size; i++, c++, r++) |
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50 | { |
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51 | dev_t dev = rtems_filesystem_make_dev_t(major, i); |
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52 | char name [] = RAMDISK_DEVICE_BASE_NAME "a"; |
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53 | name [sizeof(RAMDISK_DEVICE_BASE_NAME) - 1] += i; |
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54 | r->block_size = c->block_size; |
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55 | r->block_num = c->block_num; |
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56 | if (c->location == NULL) |
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57 | { |
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58 | r->malloced = true; |
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59 | r->area = malloc(r->block_size * r->block_num); |
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60 | if (r->area == NULL) /* No enough memory for this disk */ |
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61 | { |
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62 | r->initialized = false; |
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63 | continue; |
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64 | } |
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65 | else |
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66 | { |
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67 | r->initialized = true; |
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68 | } |
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69 | } |
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70 | else |
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71 | { |
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72 | r->malloced = false; |
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73 | r->initialized = true; |
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74 | r->area = c->location; |
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75 | } |
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76 | rc = rtems_disk_create_phys(dev, c->block_size, c->block_num, |
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77 | ramdisk_ioctl, r, name); |
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78 | if (rc != RTEMS_SUCCESSFUL) |
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79 | { |
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80 | if (r->malloced) |
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81 | { |
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82 | free(r->area); |
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83 | } |
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84 | r->initialized = false; |
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85 | } |
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86 | } |
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87 | return RTEMS_SUCCESSFUL; |
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88 | } |
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