| 53,6 → 53,16 |
|---|
| */ |
| static futex_t fat_alloc_lock = FUTEX_INITIALIZER; |
| |
| /** Read block from file located on a FAT file system. |
| * |
| * @param bs Buffer holding the boot sector of the file system. |
| * @param dev_handle Device handle of the file system. |
| * @param firstc First cluster used by the file. Can be zero if the file |
| * is empty. |
| * @param offset Offset in blocks. |
| * |
| * @return Block structure holding the requested block. |
| */ |
| block_t * |
| _fat_block_get(fat_bs_t *bs, dev_handle_t dev_handle, fat_cluster_t firstc, |
| off_t offset) |
| 208,6 → 218,14 |
|---|
| } |
| } |
| |
| /** Mark cluster in one instance of FAT. |
| * |
| * @param bs Buffer holding the boot sector for the file system. |
| * @param dev_handle Device handle for the file system. |
| * @param fatno Number of the FAT instance where to make the change. |
| * @param clst Cluster which is to be marked. |
| * @param value Value mark the cluster with. |
| */ |
| void |
| fat_mark_cluster(fat_bs_t *bs, dev_handle_t dev_handle, unsigned fatno, |
| fat_cluster_t clst, fat_cluster_t value) |
| 231,6 → 249,13 |
|---|
| block_put(b); |
| } |
| |
| /** Replay the allocatoin of clusters in all shadow instances of FAT. |
| * |
| * @param bs Buffer holding the boot sector of the file system. |
| * @param dev_handle Device handle of the file system. |
| * @param lifo Chain of allocated clusters. |
| * @param nclsts Number of clusters in the lifo chain. |
| */ |
| void fat_alloc_shadow_clusters(fat_bs_t *bs, dev_handle_t dev_handle, |
| fat_cluster_t *lifo, unsigned nclsts) |
| { |
| 245,6 → 270,23 |
|---|
| } |
| } |
| |
| /** Allocate clusters in FAT1. |
| * |
| * This function will attempt to allocate the requested number of clusters in |
| * the first FAT instance. The FAT will be altered so that the allocated |
| * clusters form an independent chain (i.e. a chain which does not belong to any |
| * file yet). |
| * |
| * @param bs Buffer holding the boot sector of the file system. |
| * @param dev_handle Device handle of the file system. |
| * @param nclsts Number of clusters to allocate. |
| * @param mcl Output parameter where the first cluster in the chain |
| * will be returned. |
| * @param lcl Output parameter where the last cluster in the chain |
| * will be returned. |
| * |
| * @return EOK on success, a negative error code otherwise. |
| */ |
| int |
| fat_alloc_clusters(fat_bs_t *bs, dev_handle_t dev_handle, unsigned nclsts, |
| fat_cluster_t *mcl, fat_cluster_t *lcl) |
| 314,6 → 356,12 |
|---|
| return ENOSPC; |
| } |
| |
| /** Append a cluster chain to the last file cluster in all FATs. |
| * |
| * @param bs Buffer holding boot sector of the file system. |
| * @param nodep Node representing the file. |
| * @param mcl First cluster of the cluster chain to append. |
| */ |
| void fat_append_clusters(fat_bs_t *bs, fat_node_t *nodep, fat_cluster_t mcl) |
| { |
| dev_handle_t dev_handle = nodep->idx->dev_handle; |