| 32,7 → 32,7 |
|---|
| |
| /** |
| * @file fat_fat.c |
| * @brief Functions that manipulate the file allocation tables. |
| * @brief Functions that manipulate the File Allocation Tables. |
| */ |
| |
| #include "fat_fat.h" |
| 44,7 → 44,15 |
|---|
| #include <byteorder.h> |
| #include <align.h> |
| #include <assert.h> |
| #include <futex.h> |
| |
| /** |
| * The fat_alloc_lock futex protects all copies of the File Allocation Table |
| * during allocation of clusters. The lock does not have to be held durring |
| * deallocation of clusters. |
| */ |
| static futex_t fat_alloc_lock = FUTEX_INITIALIZER; |
| |
| block_t * |
| _fat_block_get(fat_bs_t *bs, dev_handle_t dev_handle, fat_cluster_t firstc, |
| off_t offset) |
| 260,6 → 268,7 |
|---|
| /* |
| * Search FAT1 for unused clusters. |
| */ |
| futex_down(&fat_alloc_lock); |
| for (b = 0, cl = 0; b < sf; blk++) { |
| blk = block_get(dev_handle, rscnt + b, bps); |
| for (c = 0; c < bps / sizeof(fat_cluster_t); c++, cl++) { |
| 283,6 → 292,7 |
|---|
| *mcl = lifo[found - 1]; |
| *lcl = lifo[0]; |
| free(lifo); |
| futex_up(&fat_alloc_lock); |
| return EOK; |
| } |
| } |
| 289,6 → 299,7 |
|---|
| } |
| block_put(blk); |
| } |
| futex_up(&fat_alloc_lock); |
| |
| /* |
| * We could not find enough clusters. Now we need to free the clusters |