1 | /** |
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2 | * @file msdos_statvfs.c |
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3 | * |
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4 | * @brief Obtain MS-DOS filesystem information |
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5 | * @ingroup libfs_msdos MSDOS FileSystem |
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6 | */ |
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7 | |
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8 | /* |
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9 | * Copyright (c) 2013 Andrey Mozzhuhin |
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10 | * Copyright (c) 2013 Vitaly Belov |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #include "fat.h" |
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18 | #include "fat_fat_operations.h" |
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19 | #include "msdos.h" |
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20 | |
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21 | int msdos_statvfs( |
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22 | const rtems_filesystem_location_info_t *__restrict root_loc, |
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23 | struct statvfs *__restrict sb) |
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24 | { |
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25 | msdos_fs_info_t *fs_info = root_loc->mt_entry->fs_info; |
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26 | fat_vol_t *vol = &fs_info->fat.vol; |
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27 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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28 | |
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29 | sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT, |
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30 | MSDOS_VOLUME_SEMAPHORE_TIMEOUT); |
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31 | if (sc != RTEMS_SUCCESSFUL) |
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32 | rtems_set_errno_and_return_minus_one(EIO); |
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33 | |
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34 | sb->f_bsize = FAT_SECTOR512_SIZE; |
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35 | sb->f_frsize = vol->bpc; |
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36 | sb->f_blocks = vol->data_cls; |
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37 | sb->f_bfree = 0; |
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38 | sb->f_bavail = 0; |
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39 | sb->f_files = 0; // FAT doesn't store inodes |
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40 | sb->f_ffree = 0; |
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41 | sb->f_favail = 0; |
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42 | sb->f_flag = 0; |
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43 | sb->f_namemax = MSDOS_NAME_MAX_LNF_LEN; |
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44 | |
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45 | if (vol->free_cls == FAT_UNDEFINED_VALUE) |
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46 | { |
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47 | int rc; |
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48 | uint32_t cur_cl = 2; |
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49 | uint32_t value = 0; |
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50 | uint32_t data_cls_val = vol->data_cls + 2; |
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51 | |
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52 | for (; cur_cl < data_cls_val; ++cur_cl) |
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53 | { |
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54 | rc = fat_get_fat_cluster(&fs_info->fat, cur_cl, &value); |
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55 | if (rc != RC_OK) |
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56 | { |
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57 | rtems_semaphore_release(fs_info->vol_sema); |
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58 | return rc; |
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59 | } |
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60 | |
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61 | if (value == FAT_GENFAT_FREE) |
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62 | { |
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63 | sb->f_bfree++; |
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64 | sb->f_bavail++; |
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65 | } |
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66 | } |
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67 | } |
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68 | else |
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69 | { |
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70 | sb->f_bfree = vol->free_cls; |
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71 | sb->f_bavail = vol->free_cls; |
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72 | } |
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73 | |
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74 | rtems_semaphore_release(fs_info->vol_sema); |
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75 | return RC_OK; |
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76 | } |
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