コード例 #1
0
ファイル: block_store.c プロジェクト: bwk34/OSF15_Exercise2
size_t block_store_write(block_store_t *const bs, const size_t block_id, const void *buffer, const size_t nbytes, const size_t offset) {
    if (bs && bs->fbm && bs->data_blocks && BLOCKID_VALID(block_id)
            && buffer && nbytes && (nbytes + offset <= BLOCK_SIZE)) {
        size_t total_offset = offset + (BLOCK_SIZE * (block_id - FBM_SIZE));
        memcpy((void *)(bs->data_blocks + total_offset), buffer, nbytes);
        block_store_errno = bitmap_test(bs->fbm, block_id) ? BS_OK : BS_FBM_REQUEST_MISMATCH;
        return nbytes;
    }
    block_store_errno = BS_FATAL;
    return 0;
}
コード例 #2
0
ファイル: block_store.c プロジェクト: cjc455/OSF15_Library
// Need to refactor this for V3. Have this switch on FILE_BASED and have it either do
// block_mem_write or block_file_write (both with same params) which then handles everything
// (same for read)
size_t block_store_write(block_store_t *const bs, const size_t block_id, const void *buffer, const size_t nbytes, const size_t offset) {
    if (bs && BLOCKID_VALID(block_id) && buffer && nbytes && (nbytes + offset <= BLOCK_SIZE)) {
        // Not going to forbid writing of not-in-use blocks (but we'll log it via errno)
        bitmap_set(bs->dbm, block_id);
        FLAG_SET(bs, DIRTY);
        memcpy((void *)(bs->data_blocks + BLOCK_OFFSET_POSITION(block_id, offset)), buffer, nbytes);
        bs_errno = bitmap_test(bs->fbm, block_id) ? BS_OK : BS_REQUEST_MISMATCH;
        return nbytes;
    }
    bs_errno = BS_PARAM;
    return 0;
}
コード例 #3
0
ファイル: block_store.c プロジェクト: bwk34/OSF15_Exercise2
size_t block_store_release(block_store_t *const bs, const size_t block_id) {
    if (bs && bs->fbm && BLOCKID_VALID(block_id)) {
        // we could clear the dirty bit, since the info is no longer in use but...
        // We'll keep it. Could be useful. Doesn't really hurt anything.
        // Keeps it more true to a standard block device.
        // You could also use this function to format the specified block for security reasons
        bitmap_reset(bs->fbm, block_id);
        block_store_errno = BS_OK;
        return block_id;
    }
    block_store_errno = BS_PARAM;
    return 0;
}
コード例 #4
0
ファイル: block_store.c プロジェクト: cjc455/OSF15_Library
size_t block_store_read(const block_store_t *const bs, const size_t block_id, void *buffer, const size_t nbytes, const size_t offset) {
    if (bs && BLOCKID_VALID(block_id) && buffer && nbytes && (nbytes + offset <= BLOCK_SIZE)) {
        // Not going to forbid reading of not-in-use blocks (but we'll log it via the errno)
        memcpy(buffer, bs->data_blocks + BLOCK_OFFSET_POSITION(block_id, offset), nbytes);
        bs_errno = bitmap_test(bs->fbm, block_id) ? BS_OK : BS_REQUEST_MISMATCH;
        return nbytes;
    }
    // technically we return BS_PARAM even if the internal structure of the BS object is busted
    // Which, in reality, would be more of a BS_INTERNAL or a BS_FATAL... but it'll add another branch to everything
    // And technically the bs is a parameter...
    bs_errno = BS_PARAM;
    return 0;
}
コード例 #5
0
ファイル: block_store.c プロジェクト: cjc455/OSF15_Library
bool block_store_request(block_store_t *const bs, const size_t block_id) {
    if (bs && BLOCKID_VALID(block_id)) {
        if (!bitmap_test(bs->fbm, block_id)) {
            bitmap_set(bs->fbm, block_id);
            bitmap_set(bs->dbm, FBM_BLOCK_CHANGE_LOCATION(block_id));
            // Set that FBM block as changed
            FLAG_SET(bs, DIRTY);
            bs_errno = BS_OK;
            return true;
        } else {
            bs_errno = BS_IN_USE;
            return false;
        }
    }
    bs_errno = BS_PARAM;
    return false;
}