| 0,0 → 1,76 |
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| /* Basic methods for reading blocks. */ |
| |
| /* Methods: |
| * init_block: Allocates memory for working block |
| * get_block: Returns requested block according its number |
| * read_block: Process reading of requested block |
| */ |
| |
| |
| #include <stdio.h> |
| #include <async.h> |
| #include <sysinfo.h> |
| #include "fs.h" |
| #include "block.h" |
| #include "super.h" |
| #include "../rd/rd.h" |
| |
| |
| block_t* work_block; |
| |
| int init_block() |
| { |
| |
| /* Allocating free space for working block. */ |
| work_block = (block_t*)malloc(sizeof(block_t)); |
| if (work_block != NULL) |
| return TRUE; |
| |
| return FALSE; |
| } |
| |
| block_t *get_block(register block_num_t block_nr) |
| { |
| |
| if (block_nr == NO_BLOCK) |
| return (get_zero_block()); |
| |
| work_block->b_blocknr = block_nr; |
| read_block(work_block); |
| |
| return work_block; |
| } |
| |
| block_t *get_zero_block() |
| { |
| |
| /* Setting all bytes inside block to 0 */ |
| memset(work_block->b.b__data, 0, BLOCK_SIZE); |
| |
| return work_block; |
| } |
| |
| void read_block(register block_t *bp) |
| { |
| |
| int r; |
| offset_t pos, header_size; |
| |
| header_size = sysinfo_value("rd.header_size"); |
| pos = header_size + (offset_t)bp->b_blocknr * BLOCK_SIZE; |
| |
| /* Reading a block with specified number from ramdisk into shared buffer. */ |
| r = async_req_2(rd_phone, RD_READ_BLOCK, pos, BLOCK_SIZE, NULL, NULL); |
| if (r < 0) { |
| print_console_int("Unrecoverable disk error on RAMDISK, block: %d\n", bp->b_blocknr); |
| print_console_int("Error number: %d\n", r); |
| status = FS_EIO; |
| return; |
| } |
| |
| /* Copy retrieved data from buffer into work block. */ |
| memcpy((void *)(bp->b.b__data), (void *)buffer, BLOCK_SIZE); |
| status = BLOCK_SIZE; |
| } |
| |
| |